daemon
client
-lexer.l
-lexer.c
-tokens.h
pcsum.h
version.h
-spec.sgml
*.sasp*
*.lout*
*.li
-*.ps
-spec.html
config.cache
config.log
*.new
vd
+dist_tmp
tilde
slash-etc
shipcheck
+
+userv-*.tar.gz
daemon.h debug.c parser.c lib.c lib.h \
language.i4 lexer.l.m4 tokens.h.m4
-ALSOSHIP= README INSTALL Changelog COPYING \
- system.default system.override \
- spec.sgml.in overview.fig overview.ps \
- buildship install-sh .cvsignore
-
-GENSHIP_CLEAN= pcsum.h lexer.l lexer.c tokens.h config.h.in spec.sgml $(TARGETS_DOC)
+GENSHIP_CLEAN= lexer.l lexer.c tokens.h config.h.in spec.sgml $(TARGETS_DOC)
GENSHIP= $(GENSHIP_CLEAN) configure
-SHIPTARGETS= $(SOURCES) $(ALSOSHIP) $(GENSHIP)
-
all: $(TARGETS)
docs: $(TARGETS_DOC)
tokens.h: language.i4
-pcsum.h
- rm -f overview.eps
- rm -f spec.lout* spec.text* spec.sgml spec.sgml.new spec.ps?*
- rm -rf spec.html?*
- rm -f lout.li *.lix *.ldx config.cache
rm -f *.o *~ core ./#*#
autoconf configure:
autoconf
clean:
+ find -name '*.orig' -o -name '*~' -o -name '.*~' \
+ -o -name '*#' -o -name '.#*' -o -name '*.bak' \
+ | xargs -r rm
rm -rf $(TARGETS) *.o
+ rm -f overview.eps
+ rm -f spec.lout* spec.text* spec.ps?* spec.sgml.new spec.html/*.html
+ rm -f lout.li *.ld *.lix *.ldx
+ rm -f userv-*.tar.gz vd/*
distclean mostlyclean: clean
- rm -f config.status config.log Makefile config.h
+ rm -f config.status config.log Makefile config.h config.cache pcsum.h
maintainer-clean: distclean
rm -rf $(GENSHIP_CLEAN)
-dist-prep: $(SHIPTARGETS)
-
-dist: $(SHIPTARGETS)
- rm -rf shipcheck
- mkdir -p shipcheck/userv-$(VERSION)
- cp -a $^ shipcheck/userv-$(VERSION)
- cd shipcheck && \
- GZIP=-9v tar zvvcf userv-$(VERSION).tar.gz userv-$(VERSION)
- rm -rf shipcheck/userv-$(VERSION)
+dist-prep: $(GENSHIP) distclean
+
+dist_tmp=dist_tmp/userv-$(VERSION)
+dist_prune=\( -name CVS -o -name 'dist_tmp*' -o -name slash-etc -o -name vd \)
+dist: dist-prep
+ rm -rf dist_tmp*
+ mkdir dist_tmp $(dist_tmp)
+ find $(dist_prune) -prune -o -type d -print | \
+ sed -e 's#.*#mkdir -p $(dist_tmp)/&#' | sh
+ find $(dist_prune) -prune -o -type f -print | \
+ sed -e 's#.*#ln & $(dist_tmp)/&#' | sh
+ cd dist_tmp && tar cf ../$(dist_tmp).tar `basename $(dist_tmp)`
+ gzip -9 $(dist_tmp).tar
+ mv $(dist_tmp).tar.gz .
linecount: $(SOURCES)
wc -l $^
-userv (0.61.1) unreleased; urgency=low
+userv (0.61.2) unreleased; urgency=low
* New builtin service `help' lists builtin services.
* Reran autoconf/autoheader, latest version.
* Updated email address to ian@davenant.greenend.org.uk throughout.
- --
+ * Build arrangements changed ----
+
+ -- Ian Jackson <ian@davenant.greenend.org.uk> Sun, 18 Apr 1999 19:14:29 +0100
userv (0.60.3) frozen unstable; urgency=medium
--- /dev/null
+/* A lexical scanner generated by flex */
+
+/* Scanner skeleton version:
+ * $Header$
+ */
+
+#define FLEX_SCANNER
+#define YY_FLEX_MAJOR_VERSION 2
+#define YY_FLEX_MINOR_VERSION 5
+
+#include <stdio.h>
+
+
+/* cfront 1.2 defines "c_plusplus" instead of "__cplusplus" */
+#ifdef c_plusplus
+#ifndef __cplusplus
+#define __cplusplus
+#endif
+#endif
+
+
+#ifdef __cplusplus
+
+#include <stdlib.h>
+#include <unistd.h>
+
+/* Use prototypes in function declarations. */
+#define YY_USE_PROTOS
+
+/* The "const" storage-class-modifier is valid. */
+#define YY_USE_CONST
+
+#else /* ! __cplusplus */
+
+#if __STDC__
+
+#define YY_USE_PROTOS
+#define YY_USE_CONST
+
+#endif /* __STDC__ */
+#endif /* ! __cplusplus */
+
+#ifdef __TURBOC__
+ #pragma warn -rch
+ #pragma warn -use
+#include <io.h>
+#include <stdlib.h>
+#define YY_USE_CONST
+#define YY_USE_PROTOS
+#endif
+
+#ifdef YY_USE_CONST
+#define yyconst const
+#else
+#define yyconst
+#endif
+
+
+#ifdef YY_USE_PROTOS
+#define YY_PROTO(proto) proto
+#else
+#define YY_PROTO(proto) ()
+#endif
+
+/* Returned upon end-of-file. */
+#define YY_NULL 0
+
+/* Promotes a possibly negative, possibly signed char to an unsigned
+ * integer for use as an array index. If the signed char is negative,
+ * we want to instead treat it as an 8-bit unsigned char, hence the
+ * double cast.
+ */
+#define YY_SC_TO_UI(c) ((unsigned int) (unsigned char) c)
+
+/* Enter a start condition. This macro really ought to take a parameter,
+ * but we do it the disgusting crufty way forced on us by the ()-less
+ * definition of BEGIN.
+ */
+#define BEGIN yy_start = 1 + 2 *
+
+/* Translate the current start state into a value that can be later handed
+ * to BEGIN to return to the state. The YYSTATE alias is for lex
+ * compatibility.
+ */
+#define YY_START ((yy_start - 1) / 2)
+#define YYSTATE YY_START
+
+/* Action number for EOF rule of a given start state. */
+#define YY_STATE_EOF(state) (YY_END_OF_BUFFER + state + 1)
+
+/* Special action meaning "start processing a new file". */
+#define YY_NEW_FILE yyrestart( yyin )
+
+#define YY_END_OF_BUFFER_CHAR 0
+
+/* Size of default input buffer. */
+#define YY_BUF_SIZE 16384
+
+typedef struct yy_buffer_state *YY_BUFFER_STATE;
+
+extern int yyleng;
+extern FILE *yyin, *yyout;
+
+#define EOB_ACT_CONTINUE_SCAN 0
+#define EOB_ACT_END_OF_FILE 1
+#define EOB_ACT_LAST_MATCH 2
+
+/* The funky do-while in the following #define is used to turn the definition
+ * int a single C statement (which needs a semi-colon terminator). This
+ * avoids problems with code like:
+ *
+ * if ( condition_holds )
+ * yyless( 5 );
+ * else
+ * do_something_else();
+ *
+ * Prior to using the do-while the compiler would get upset at the
+ * "else" because it interpreted the "if" statement as being all
+ * done when it reached the ';' after the yyless() call.
+ */
+
+/* Return all but the first 'n' matched characters back to the input stream. */
+
+#define yyless(n) \
+ do \
+ { \
+ /* Undo effects of setting up yytext. */ \
+ *yy_cp = yy_hold_char; \
+ YY_RESTORE_YY_MORE_OFFSET \
+ yy_c_buf_p = yy_cp = yy_bp + n - YY_MORE_ADJ; \
+ YY_DO_BEFORE_ACTION; /* set up yytext again */ \
+ } \
+ while ( 0 )
+
+#define unput(c) yyunput( c, yytext_ptr )
+
+/* The following is because we cannot portably get our hands on size_t
+ * (without autoconf's help, which isn't available because we want
+ * flex-generated scanners to compile on their own).
+ */
+typedef unsigned int yy_size_t;
+
+
+struct yy_buffer_state
+ {
+ FILE *yy_input_file;
+
+ char *yy_ch_buf; /* input buffer */
+ char *yy_buf_pos; /* current position in input buffer */
+
+ /* Size of input buffer in bytes, not including room for EOB
+ * characters.
+ */
+ yy_size_t yy_buf_size;
+
+ /* Number of characters read into yy_ch_buf, not including EOB
+ * characters.
+ */
+ int yy_n_chars;
+
+ /* Whether we "own" the buffer - i.e., we know we created it,
+ * and can realloc() it to grow it, and should free() it to
+ * delete it.
+ */
+ int yy_is_our_buffer;
+
+ /* Whether this is an "interactive" input source; if so, and
+ * if we're using stdio for input, then we want to use getc()
+ * instead of fread(), to make sure we stop fetching input after
+ * each newline.
+ */
+ int yy_is_interactive;
+
+ /* Whether we're considered to be at the beginning of a line.
+ * If so, '^' rules will be active on the next match, otherwise
+ * not.
+ */
+ int yy_at_bol;
+
+ /* Whether to try to fill the input buffer when we reach the
+ * end of it.
+ */
+ int yy_fill_buffer;
+
+ int yy_buffer_status;
+#define YY_BUFFER_NEW 0
+#define YY_BUFFER_NORMAL 1
+ /* When an EOF's been seen but there's still some text to process
+ * then we mark the buffer as YY_EOF_PENDING, to indicate that we
+ * shouldn't try reading from the input source any more. We might
+ * still have a bunch of tokens to match, though, because of
+ * possible backing-up.
+ *
+ * When we actually see the EOF, we change the status to "new"
+ * (via yyrestart()), so that the user can continue scanning by
+ * just pointing yyin at a new input file.
+ */
+#define YY_BUFFER_EOF_PENDING 2
+ };
+
+static YY_BUFFER_STATE yy_current_buffer = 0;
+
+/* We provide macros for accessing buffer states in case in the
+ * future we want to put the buffer states in a more general
+ * "scanner state".
+ */
+#define YY_CURRENT_BUFFER yy_current_buffer
+
+
+/* yy_hold_char holds the character lost when yytext is formed. */
+static char yy_hold_char;
+
+static int yy_n_chars; /* number of characters read into yy_ch_buf */
+
+
+int yyleng;
+
+/* Points to current character in buffer. */
+static char *yy_c_buf_p = (char *) 0;
+static int yy_init = 1; /* whether we need to initialize */
+static int yy_start = 0; /* start state number */
+
+/* Flag which is used to allow yywrap()'s to do buffer switches
+ * instead of setting up a fresh yyin. A bit of a hack ...
+ */
+static int yy_did_buffer_switch_on_eof;
+
+void yyrestart YY_PROTO(( FILE *input_file ));
+
+void yy_switch_to_buffer YY_PROTO(( YY_BUFFER_STATE new_buffer ));
+void yy_load_buffer_state YY_PROTO(( void ));
+YY_BUFFER_STATE yy_create_buffer YY_PROTO(( FILE *file, int size ));
+void yy_delete_buffer YY_PROTO(( YY_BUFFER_STATE b ));
+void yy_init_buffer YY_PROTO(( YY_BUFFER_STATE b, FILE *file ));
+void yy_flush_buffer YY_PROTO(( YY_BUFFER_STATE b ));
+#define YY_FLUSH_BUFFER yy_flush_buffer( yy_current_buffer )
+
+YY_BUFFER_STATE yy_scan_buffer YY_PROTO(( char *base, yy_size_t size ));
+YY_BUFFER_STATE yy_scan_string YY_PROTO(( yyconst char *yy_str ));
+YY_BUFFER_STATE yy_scan_bytes YY_PROTO(( yyconst char *bytes, int len ));
+
+static void *yy_flex_alloc YY_PROTO(( yy_size_t ));
+static void *yy_flex_realloc YY_PROTO(( void *, yy_size_t ));
+static void yy_flex_free YY_PROTO(( void * ));
+
+#define yy_new_buffer yy_create_buffer
+
+#define yy_set_interactive(is_interactive) \
+ { \
+ if ( ! yy_current_buffer ) \
+ yy_current_buffer = yy_create_buffer( yyin, YY_BUF_SIZE ); \
+ yy_current_buffer->yy_is_interactive = is_interactive; \
+ }
+
+#define yy_set_bol(at_bol) \
+ { \
+ if ( ! yy_current_buffer ) \
+ yy_current_buffer = yy_create_buffer( yyin, YY_BUF_SIZE ); \
+ yy_current_buffer->yy_at_bol = at_bol; \
+ }
+
+#define YY_AT_BOL() (yy_current_buffer->yy_at_bol)
+
+
+#define yywrap() 1
+#define YY_SKIP_YYWRAP
+typedef unsigned char YY_CHAR;
+FILE *yyin = (FILE *) 0, *yyout = (FILE *) 0;
+typedef int yy_state_type;
+extern char *yytext;
+#define yytext_ptr yytext
+
+static yy_state_type yy_get_previous_state YY_PROTO(( void ));
+static yy_state_type yy_try_NUL_trans YY_PROTO(( yy_state_type current_state ));
+static int yy_get_next_buffer YY_PROTO(( void ));
+static void yy_fatal_error YY_PROTO(( yyconst char msg[] ));
+
+/* Done after the current pattern has been matched and before the
+ * corresponding action - sets up yytext.
+ */
+#define YY_DO_BEFORE_ACTION \
+ yytext_ptr = yy_bp; \
+ yyleng = (int) (yy_cp - yy_bp); \
+ yy_hold_char = *yy_cp; \
+ *yy_cp = '\0'; \
+ yy_c_buf_p = yy_cp;
+
+#define YY_NUM_RULES 103
+#define YY_END_OF_BUFFER 104
+static yyconst short int yy_accept[572] =
+ { 0,
+ 0, 0, 104, 102, 96, 97, 89, 101, 99, 86,
+ 90, 87, 88, 93, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 91, 102, 96, 97,
+ 99, 101, 101, 100, 101, 99, 99, 98, 95, 93,
+ 102, 102, 102, 102, 19, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 37, 102, 102, 102, 102,
+ 32, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 100, 101, 101, 101,
+
+ 101, 0, 101, 101, 94, 93, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 31, 62, 102, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 70, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 101, 101, 100, 0, 101, 101, 94, 93, 102,
+ 102, 102, 66, 102, 102, 63, 67, 102, 102, 102,
+ 35, 36, 102, 102, 102, 102, 40, 42, 102, 50,
+ 102, 102, 59, 69, 102, 71, 102, 72, 102, 102,
+
+ 102, 102, 102, 102, 102, 30, 102, 84, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 74, 75,
+ 102, 61, 102, 101, 101, 0, 0, 0, 101, 94,
+ 93, 102, 64, 102, 102, 102, 102, 102, 58, 102,
+ 65, 102, 92, 102, 38, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 41, 102, 102,
+ 48, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 85, 101, 0, 0, 94, 93, 102, 102, 102,
+ 102, 102, 68, 102, 102, 102, 102, 102, 102, 69,
+ 76, 77, 78, 79, 80, 81, 82, 83, 102, 102,
+
+ 102, 102, 60, 102, 102, 102, 1, 102, 102, 102,
+ 102, 39, 102, 73, 102, 102, 102, 102, 0, 94,
+ 93, 102, 102, 102, 102, 102, 102, 102, 102, 49,
+ 102, 21, 26, 102, 102, 102, 10, 102, 102, 102,
+ 102, 102, 51, 102, 102, 102, 102, 45, 61, 94,
+ 93, 102, 9, 66, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 47, 102, 102, 102,
+ 102, 102, 102, 46, 102, 94, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 12, 102, 102, 102,
+ 102, 102, 102, 44, 11, 102, 102, 102, 102, 102,
+
+ 102, 94, 102, 102, 102, 102, 102, 33, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 8, 102, 102, 102, 102, 102, 102, 102, 102, 102,
+ 102, 102, 43, 34, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 102, 20, 102,
+ 102, 102, 102, 52, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 55, 102, 102,
+ 102, 102, 102, 53, 102, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 102, 56, 102, 102,
+ 15, 102, 102, 102, 102, 17, 7, 102, 102, 102,
+
+ 102, 102, 102, 102, 23, 102, 102, 102, 102, 102,
+ 102, 102, 102, 102, 102, 102, 4, 102, 102, 102,
+ 22, 102, 102, 102, 102, 102, 13, 102, 102, 102,
+ 102, 5, 6, 102, 102, 102, 102, 102, 102, 16,
+ 102, 102, 102, 102, 102, 102, 3, 25, 102, 18,
+ 102, 102, 102, 27, 102, 54, 102, 24, 14, 57,
+ 102, 102, 102, 102, 28, 102, 102, 102, 29, 2,
+ 0
+ } ;
+
+static yyconst int yy_ec[256] =
+ { 0,
+ 1, 1, 1, 1, 1, 1, 1, 1, 2, 3,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 2, 4, 5, 6, 7, 8, 9, 8, 10,
+ 11, 8, 8, 8, 12, 8, 8, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 21, 8, 8, 8,
+ 8, 8, 8, 8, 22, 22, 22, 22, 22, 22,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 8, 23, 8, 8, 24, 8, 25, 26, 27, 28,
+
+ 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
+ 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
+ 49, 50, 8, 51, 8, 8, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1
+ } ;
+
+static yyconst int yy_meta[52] =
+ { 0,
+ 1, 2, 3, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 4, 4, 4, 4, 4, 4, 4, 4,
+ 4, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1
+ } ;
+
+static yyconst short int yy_base[582] =
+ { 0,
+ 0, 0, 917, 0, 50, 918, 0, 52, 56, 0,
+ 0, 0, 0, 64, 883, 19, 44, 37, 51, 882,
+ 25, 36, 64, 885, 34, 67, 62, 867, 887, 866,
+ 75, 68, 871, 60, 880, 73, 0, 0, 106, 918,
+ 905, 109, 101, 905, 132, 116, 903, 918, 168, 177,
+ 867, 87, 860, 24, 0, 87, 874, 876, 858, 88,
+ 871, 853, 868, 855, 867, 0, 856, 865, 849, 856,
+ 0, 853, 95, 848, 862, 846, 854, 843, 838, 115,
+ 848, 854, 98, 849, 843, 130, 114, 841, 839, 835,
+ 837, 847, 848, 832, 831, 839, 0, 198, 869, 0,
+
+ 126, 134, 245, 265, 283, 292, 843, 827, 829, 835,
+ 830, 838, 820, 825, 825, 816, 833, 829, 829, 815,
+ 823, 0, 816, 827, 827, 812, 826, 810, 810, 812,
+ 808, 808, 820, 0, 808, 800, 799, 132, 808, 804,
+ 797, 805, 812, 792, 804, 806, 804, 787, 802, 785,
+ 783, 816, 785, 786, 789, 788, 781, 782, 778, 782,
+ 775, 301, 318, 918, 348, 384, 393, 411, 420, 782,
+ 773, 769, 775, 781, 781, 0, 0, 773, 780, 771,
+ 0, 0, 778, 766, 765, 761, 0, 0, 778, 0,
+ 762, 758, 0, 773, 765, 0, 775, 0, 766, 132,
+
+ 771, 785, 754, 768, 757, 0, 764, 0, 765, 758,
+ 746, 747, 755, 758, 744, 743, 745, 754, 770, 0,
+ 748, 747, 750, 429, 438, 135, 0, 464, 200, 482,
+ 491, 733, 0, 765, 734, 737, 762, 735, 0, 734,
+ 0, 732, 727, 725, 0, 739, 739, 730, 500, 734,
+ 721, 719, 722, 732, 730, 726, 729, 0, 713, 714,
+ 0, 722, 727, 715, 723, 722, 719, 703, 706, 708,
+ 708, 0, 139, 0, 508, 526, 535, 717, 714, 710,
+ 711, 700, 0, 702, 701, 726, 708, 724, 706, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 705, 706,
+
+ 720, 691, 0, 702, 701, 684, 715, 697, 681, 695,
+ 677, 0, 679, 0, 692, 693, 681, 687, 198, 544,
+ 553, 688, 688, 669, 702, 668, 683, 674, 123, 698,
+ 679, 696, 0, 668, 677, 663, 0, 675, 674, 672,
+ 689, 651, 687, 665, 654, 660, 665, 0, 0, 562,
+ 682, 681, 0, 0, 134, 659, 664, 661, 644, 649,
+ 140, 659, 194, 648, 647, 655, 0, 641, 654, 651,
+ 179, 638, 667, 0, 645, 571, 198, 635, 633, 631,
+ 630, 635, 629, 659, 625, 627, 0, 635, 637, 627,
+ 627, 618, 620, 0, 0, 634, 619, 617, 620, 633,
+
+ 621, 0, 620, 606, 611, 614, 623, 0, 639, 606,
+ 617, 100, 615, 608, 604, 616, 605, 614, 609, 598,
+ 0, 601, 610, 600, 595, 607, 602, 591, 604, 587,
+ 589, 598, 0, 0, 596, 125, 592, 590, 597, 577,
+ 588, 592, 573, 599, 554, 553, 557, 501, 0, 502,
+ 461, 434, 435, 462, 428, 436, 443, 427, 418, 449,
+ 390, 383, 350, 350, 354, 367, 351, 378, 360, 345,
+ 349, 347, 373, 0, 341, 343, 353, 352, 344, 346,
+ 198, 334, 334, 336, 363, 336, 331, 0, 329, 333,
+ 0, 316, 321, 316, 325, 0, 0, 314, 316, 316,
+
+ 320, 327, 303, 286, 317, 296, 290, 295, 293, 280,
+ 277, 247, 249, 246, 232, 242, 0, 230, 227, 227,
+ 0, 243, 212, 227, 212, 225, 0, 226, 219, 221,
+ 214, 0, 0, 220, 216, 196, 208, 202, 202, 0,
+ 203, 198, 205, 202, 198, 206, 0, 0, 196, 0,
+ 187, 193, 190, 0, 173, 0, 164, 0, 0, 0,
+ 177, 177, 165, 145, 0, 134, 141, 119, 0, 0,
+ 918, 592, 596, 600, 604, 608, 612, 616, 620, 138,
+ 67
+ } ;
+
+static yyconst short int yy_def[582] =
+ { 0,
+ 571, 1, 571, 572, 571, 571, 572, 573, 574, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 571, 571,
+ 575, 573, 576, 577, 573, 574, 575, 571, 572, 14,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 578, 576, 577, 578,
+
+ 578, 579, 577, 573, 572, 14, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 578, 576, 571, 579, 103, 104, 572, 14, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 578, 163, 571, 580, 579, 573, 572,
+ 14, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 576, 581, 228, 572, 14, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 579, 572,
+ 14, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 572, 572, 572, 572, 572, 572, 572, 572, 572, 572,
+ 0, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571
+ } ;
+
+static yyconst short int yy_nxt[970] =
+ { 0,
+ 4, 5, 6, 7, 8, 9, 10, 4, 11, 12,
+ 13, 4, 14, 14, 14, 14, 14, 14, 14, 14,
+ 14, 4, 4, 15, 16, 4, 17, 18, 19, 20,
+ 21, 22, 23, 4, 24, 25, 26, 27, 28, 29,
+ 30, 31, 32, 33, 34, 35, 36, 4, 4, 4,
+ 37, 39, 40, 43, 52, 41, 44, 47, 48, 111,
+ 67, 57, 69, 53, 70, 58, 68, 112, 54, 59,
+ 102, 55, 75, 76, 45, 49, 50, 50, 50, 50,
+ 50, 50, 50, 50, 50, 56, 60, 61, 62, 63,
+ 79, 77, 64, 71, 72, 78, 87, 95, 65, 85,
+
+ 80, 73, 92, 86, 93, 97, 81, 39, 40, 88,
+ 43, 41, 89, 44, 96, 108, 90, 47, 48, 113,
+ 118, 130, 109, 98, 131, 114, 138, 101, 102, 435,
+ 119, 45, 99, 101, 102, 142, 226, 102, 164, 143,
+ 150, 274, 436, 97, 103, 103, 103, 103, 103, 103,
+ 103, 103, 103, 99, 146, 151, 165, 152, 139, 199,
+ 252, 98, 359, 147, 378, 385, 360, 570, 457, 386,
+ 148, 569, 149, 458, 200, 568, 253, 567, 379, 104,
+ 105, 105, 105, 105, 105, 105, 105, 105, 105, 106,
+ 106, 106, 106, 106, 106, 106, 106, 106, 100, 101,
+
+ 102, 43, 164, 566, 44, 565, 564, 563, 562, 397,
+ 162, 162, 162, 162, 162, 162, 162, 162, 162, 100,
+ 165, 388, 45, 398, 403, 501, 389, 561, 560, 390,
+ 559, 558, 557, 556, 555, 554, 553, 502, 552, 551,
+ 404, 550, 405, 549, 548, 163, 100, 547, 546, 545,
+ 544, 543, 542, 541, 540, 539, 538, 166, 166, 166,
+ 166, 166, 166, 166, 166, 166, 43, 537, 536, 44,
+ 535, 534, 533, 532, 531, 530, 529, 167, 167, 167,
+ 167, 167, 167, 167, 167, 167, 167, 45, 528, 167,
+ 167, 167, 167, 167, 167, 168, 168, 168, 168, 168,
+
+ 168, 168, 168, 168, 169, 169, 169, 169, 169, 169,
+ 169, 169, 169, 224, 224, 224, 224, 224, 224, 224,
+ 224, 224, 97, 527, 526, 525, 524, 523, 522, 521,
+ 225, 225, 225, 225, 225, 225, 225, 225, 225, 225,
+ 98, 520, 225, 225, 225, 225, 225, 225, 571, 226,
+ 102, 519, 518, 517, 516, 515, 514, 513, 512, 511,
+ 227, 227, 227, 227, 227, 227, 227, 227, 227, 571,
+ 510, 509, 508, 507, 506, 505, 504, 503, 500, 499,
+ 498, 497, 496, 495, 494, 493, 492, 491, 490, 489,
+ 488, 487, 486, 485, 484, 228, 42, 42, 42, 42,
+
+ 42, 42, 42, 42, 42, 229, 229, 229, 229, 229,
+ 229, 229, 229, 229, 229, 483, 482, 229, 229, 229,
+ 229, 229, 229, 230, 230, 230, 230, 230, 230, 230,
+ 230, 230, 231, 231, 231, 231, 231, 231, 231, 231,
+ 231, 43, 43, 43, 43, 43, 43, 43, 43, 43,
+ 273, 273, 273, 273, 273, 273, 273, 273, 273, 273,
+ 481, 480, 273, 273, 273, 273, 273, 273, 164, 479,
+ 478, 477, 476, 475, 474, 473, 275, 275, 275, 275,
+ 275, 275, 275, 275, 275, 275, 165, 472, 275, 275,
+ 275, 275, 275, 275, 276, 276, 276, 276, 276, 276,
+
+ 276, 276, 276, 277, 277, 277, 277, 277, 277, 277,
+ 277, 277, 291, 292, 293, 294, 295, 296, 297, 298,
+ 319, 319, 319, 319, 319, 319, 319, 319, 319, 319,
+ 471, 470, 319, 319, 319, 319, 319, 319, 320, 320,
+ 320, 320, 320, 320, 320, 320, 320, 321, 321, 321,
+ 321, 321, 321, 321, 321, 321, 350, 350, 350, 350,
+ 350, 350, 350, 350, 350, 351, 351, 351, 351, 351,
+ 351, 351, 351, 351, 376, 376, 376, 376, 376, 376,
+ 376, 376, 376, 402, 402, 402, 402, 402, 402, 402,
+ 402, 402, 38, 469, 468, 38, 42, 42, 467, 42,
+
+ 46, 46, 46, 46, 47, 47, 47, 47, 43, 43,
+ 466, 43, 99, 99, 465, 99, 100, 100, 464, 100,
+ 102, 102, 463, 102, 462, 461, 460, 459, 456, 455,
+ 454, 453, 452, 451, 450, 449, 448, 447, 446, 445,
+ 444, 443, 442, 441, 440, 439, 438, 437, 434, 433,
+ 432, 431, 430, 429, 428, 427, 426, 425, 424, 423,
+ 422, 421, 420, 419, 418, 417, 416, 415, 414, 413,
+ 412, 411, 410, 409, 408, 407, 406, 401, 400, 399,
+ 396, 395, 394, 393, 392, 391, 387, 384, 383, 382,
+ 381, 380, 377, 49, 375, 374, 373, 372, 371, 354,
+
+ 370, 369, 368, 367, 366, 365, 364, 363, 362, 361,
+ 358, 357, 356, 355, 354, 353, 352, 349, 348, 347,
+ 346, 345, 344, 343, 342, 341, 340, 339, 338, 337,
+ 336, 335, 334, 333, 332, 331, 330, 329, 328, 327,
+ 326, 325, 324, 323, 322, 318, 317, 316, 315, 314,
+ 313, 312, 311, 310, 309, 308, 307, 306, 305, 304,
+ 303, 302, 301, 300, 299, 290, 289, 288, 287, 286,
+ 285, 284, 283, 282, 281, 280, 279, 278, 272, 271,
+ 270, 269, 268, 267, 266, 265, 264, 263, 262, 261,
+ 260, 259, 258, 257, 241, 256, 255, 254, 251, 250,
+
+ 249, 248, 247, 246, 245, 244, 243, 242, 241, 240,
+ 239, 238, 237, 236, 235, 234, 233, 232, 223, 222,
+ 221, 220, 219, 218, 217, 216, 215, 214, 213, 212,
+ 211, 210, 209, 208, 207, 206, 205, 204, 203, 202,
+ 201, 198, 197, 196, 195, 194, 193, 192, 191, 190,
+ 189, 188, 187, 186, 185, 184, 183, 182, 181, 180,
+ 179, 178, 177, 176, 175, 174, 173, 172, 171, 170,
+ 100, 161, 160, 159, 158, 157, 156, 155, 154, 153,
+ 145, 144, 141, 140, 137, 136, 135, 134, 133, 132,
+ 129, 128, 127, 126, 125, 124, 123, 122, 121, 120,
+
+ 117, 116, 115, 110, 107, 48, 100, 48, 94, 91,
+ 84, 83, 82, 74, 66, 51, 571, 3, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571
+ } ;
+
+static yyconst short int yy_chk[970] =
+ { 0,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 5, 5, 8, 16, 5, 8, 9, 9, 54,
+ 21, 18, 22, 16, 22, 18, 21, 54, 17, 18,
+ 581, 17, 25, 25, 8, 14, 14, 14, 14, 14,
+ 14, 14, 14, 14, 14, 17, 19, 19, 19, 19,
+ 27, 26, 19, 23, 23, 26, 32, 36, 19, 31,
+
+ 27, 23, 34, 31, 34, 43, 27, 39, 39, 32,
+ 42, 39, 32, 42, 36, 52, 32, 46, 46, 56,
+ 60, 73, 52, 43, 73, 56, 80, 101, 101, 412,
+ 60, 42, 45, 45, 45, 83, 226, 226, 102, 83,
+ 87, 580, 412, 273, 45, 45, 45, 45, 45, 45,
+ 45, 45, 45, 45, 86, 87, 102, 87, 80, 138,
+ 200, 273, 329, 86, 355, 361, 329, 568, 436, 361,
+ 86, 567, 86, 436, 138, 566, 200, 564, 355, 45,
+ 49, 49, 49, 49, 49, 49, 49, 49, 49, 50,
+ 50, 50, 50, 50, 50, 50, 50, 50, 98, 98,
+
+ 98, 229, 319, 563, 229, 562, 561, 557, 555, 371,
+ 98, 98, 98, 98, 98, 98, 98, 98, 98, 98,
+ 319, 363, 229, 371, 377, 481, 363, 553, 552, 363,
+ 551, 549, 546, 545, 544, 543, 542, 481, 541, 539,
+ 377, 538, 377, 537, 536, 98, 103, 535, 534, 531,
+ 530, 529, 528, 526, 525, 524, 523, 103, 103, 103,
+ 103, 103, 103, 103, 103, 103, 104, 522, 520, 104,
+ 519, 518, 516, 515, 514, 513, 512, 104, 104, 104,
+ 104, 104, 104, 104, 104, 104, 104, 104, 511, 104,
+ 104, 104, 104, 104, 104, 105, 105, 105, 105, 105,
+
+ 105, 105, 105, 105, 106, 106, 106, 106, 106, 106,
+ 106, 106, 106, 162, 162, 162, 162, 162, 162, 162,
+ 162, 162, 163, 510, 509, 508, 507, 506, 505, 504,
+ 163, 163, 163, 163, 163, 163, 163, 163, 163, 163,
+ 163, 503, 163, 163, 163, 163, 163, 163, 165, 165,
+ 165, 502, 501, 500, 499, 498, 495, 494, 493, 492,
+ 165, 165, 165, 165, 165, 165, 165, 165, 165, 165,
+ 490, 489, 487, 486, 485, 484, 483, 482, 480, 479,
+ 478, 477, 476, 475, 473, 472, 471, 470, 469, 468,
+ 467, 466, 465, 464, 463, 165, 166, 166, 166, 166,
+
+ 166, 166, 166, 166, 166, 167, 167, 167, 167, 167,
+ 167, 167, 167, 167, 167, 462, 461, 167, 167, 167,
+ 167, 167, 167, 168, 168, 168, 168, 168, 168, 168,
+ 168, 168, 169, 169, 169, 169, 169, 169, 169, 169,
+ 169, 224, 224, 224, 224, 224, 224, 224, 224, 224,
+ 225, 225, 225, 225, 225, 225, 225, 225, 225, 225,
+ 460, 459, 225, 225, 225, 225, 225, 225, 228, 458,
+ 457, 456, 455, 454, 453, 452, 228, 228, 228, 228,
+ 228, 228, 228, 228, 228, 228, 228, 451, 228, 228,
+ 228, 228, 228, 228, 230, 230, 230, 230, 230, 230,
+
+ 230, 230, 230, 231, 231, 231, 231, 231, 231, 231,
+ 231, 231, 249, 249, 249, 249, 249, 249, 249, 249,
+ 275, 275, 275, 275, 275, 275, 275, 275, 275, 275,
+ 450, 448, 275, 275, 275, 275, 275, 275, 276, 276,
+ 276, 276, 276, 276, 276, 276, 276, 277, 277, 277,
+ 277, 277, 277, 277, 277, 277, 320, 320, 320, 320,
+ 320, 320, 320, 320, 320, 321, 321, 321, 321, 321,
+ 321, 321, 321, 321, 350, 350, 350, 350, 350, 350,
+ 350, 350, 350, 376, 376, 376, 376, 376, 376, 376,
+ 376, 376, 572, 447, 446, 572, 573, 573, 445, 573,
+
+ 574, 574, 574, 574, 575, 575, 575, 575, 576, 576,
+ 444, 576, 577, 577, 443, 577, 578, 578, 442, 578,
+ 579, 579, 441, 579, 440, 439, 438, 437, 435, 432,
+ 431, 430, 429, 428, 427, 426, 425, 424, 423, 422,
+ 420, 419, 418, 417, 416, 415, 414, 413, 411, 410,
+ 409, 407, 406, 405, 404, 403, 401, 400, 399, 398,
+ 397, 396, 393, 392, 391, 390, 389, 388, 386, 385,
+ 384, 383, 382, 381, 380, 379, 378, 375, 373, 372,
+ 370, 369, 368, 366, 365, 364, 362, 360, 359, 358,
+ 357, 356, 352, 351, 347, 346, 345, 344, 343, 342,
+
+ 341, 340, 339, 338, 336, 335, 334, 332, 331, 330,
+ 328, 327, 326, 325, 324, 323, 322, 318, 317, 316,
+ 315, 313, 311, 310, 309, 308, 307, 306, 305, 304,
+ 302, 301, 300, 299, 289, 288, 287, 286, 285, 284,
+ 282, 281, 280, 279, 278, 271, 270, 269, 268, 267,
+ 266, 265, 264, 263, 262, 260, 259, 257, 256, 255,
+ 254, 253, 252, 251, 250, 248, 247, 246, 244, 243,
+ 242, 240, 238, 237, 236, 235, 234, 232, 223, 222,
+ 221, 219, 218, 217, 216, 215, 214, 213, 212, 211,
+ 210, 209, 207, 205, 204, 203, 202, 201, 199, 197,
+
+ 195, 194, 192, 191, 189, 186, 185, 184, 183, 180,
+ 179, 178, 175, 174, 173, 172, 171, 170, 161, 160,
+ 159, 158, 157, 156, 155, 154, 153, 152, 151, 150,
+ 149, 148, 147, 146, 145, 144, 143, 142, 141, 140,
+ 139, 137, 136, 135, 133, 132, 131, 130, 129, 128,
+ 127, 126, 125, 124, 123, 121, 120, 119, 118, 117,
+ 116, 115, 114, 113, 112, 111, 110, 109, 108, 107,
+ 99, 96, 95, 94, 93, 92, 91, 90, 89, 88,
+ 85, 84, 82, 81, 79, 78, 77, 76, 75, 74,
+ 72, 70, 69, 68, 67, 65, 64, 63, 62, 61,
+
+ 59, 58, 57, 53, 51, 47, 44, 41, 35, 33,
+ 30, 29, 28, 24, 20, 15, 3, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571, 571,
+ 571, 571, 571, 571, 571, 571, 571, 571, 571
+ } ;
+
+static yy_state_type yy_last_accepting_state;
+static char *yy_last_accepting_cpos;
+
+/* The intent behind this definition is that it'll catch
+ * any uses of REJECT which flex missed.
+ */
+#define REJECT reject_used_but_not_detected
+#define yymore() yymore_used_but_not_detected
+#define YY_MORE_ADJ 0
+#define YY_RESTORE_YY_MORE_OFFSET
+char *yytext;
+#line 1 "lexer.l"
+#define INITIAL 0
+/*
+ * Copyright (C)1996-1997,1999 Ian Jackson
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with userv; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#line 20 "lexer.l"
+
+
+
+
+
+#include <syslog.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <grp.h>
+#include <fnmatch.h>
+#include <limits.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <errno.h>
+
+#include "config.h"
+#include "common.h"
+#include "daemon.h"
+#include "lib.h"
+#include "tokens.h"
+
+#define HYPHEN '-'
+
+typedef int directive_fnt(int dtoken);
+static directive_fnt df_reject, df_execute, df_executefrompath;
+static directive_fnt df_executefromdirectory, df_executebuiltin;
+static directive_fnt df_errorstostderr, df_errorstosyslog, df_errorstofile;
+static directive_fnt dfg_fdwant, dfg_setflag;
+static directive_fnt df_reset, df_cd, df_userrcfile, df_include;
+static directive_fnt df_includelookup, df_includedirectory;
+static directive_fnt df_message, df_error, df_quit, df_eof;
+static directive_fnt df_if, df_catchquit, df_errorspush;
+static directive_fnt dfi_includeuserrcfile, dfi_includeclientconfig;
+/* directive functions return:
+ * 0 for success having scanned up to and including end of line but not beyond,
+ * or tokv_error or tokv_quit.
+ * They expect to parse the whitespace before their parameters (if any).
+ */
+
+typedef int parmcondition_fnt(int ctoken, char *const *parmvalues, int *rtrue);
+static parmcondition_fnt pcf_glob, pcf_range, pcf_grep;
+/* all conditional functions return tokv_error for failure or 0 for success
+ * at parsing and testing, in which case *rtrue is set to 0 or 1.
+ * On success they have scanned up to and including the condition's
+ * terminating newline; the pcf_... functions expect to parse the whitespace
+ * between the parameter name and the condition's arguments.
+ * Otherwise they return tokv_error.
+ * The parameter-based conditionals take a list of parameter values
+ * as obtained from the parameter functions and pa_parameter,
+ * and do _not_ free it.
+ */
+
+typedef int parameter_fnt(int ptoken, char ***rvalues);
+static parameter_fnt pf_service;
+static parameter_fnt pf_callinguser, pf_serviceuser;
+static parameter_fnt pf_callinggroup, pf_servicegroup;
+static parameter_fnt pf_callingusershell, pf_serviceusershell;
+/* Parameter functions return tokv_error or 0 for success at parsing
+ * and determining the value, in which case *rvalues is made to be
+ * a mallocd null-terminated array of pointers to mallocd strings.
+ * freeparm can be used to free such an array.
+ */
+
+typedef int builtinserviceparse_fnt(char ***rnewargs);
+static builtinserviceparse_fnt bispa_none, bispa_parameter;
+/* These parse the arguments to a builtin service, including the
+ * newline at the end of the line. *rnewargs will initially be
+ * null, indicating that no arguments are to be set; the function
+ * may store a mallocd array of mallocd strings in it,
+ * containing the arguments it wishes to have set (null-pointer
+ * terminated).
+ */
+
+static int yylex(void);
+/* Returns a token (which may be an eof or error exception) */
+
+static directive_fnt *lr_dir;
+static parmcondition_fnt *lr_parmcond;
+static builtinserviceparse_fnt *lr_bispa;
+static builtinserviceexec_fnt *lr_bisexec;
+static parameter_fnt *lr_parameter;
+static int lr_loglevel, lr_logfacility, lr_min, lr_max, *lr_flag;
+static int lr_flagval, lr_controlend;
+static int lr_fdwant_readwrite; /* -1=never, 0=opt, 1=always */
+
+/* Forward declarations of things used in lexer and parser */
+
+struct parser_state {
+ int lineno, reportlineno, notedreferer, isinternal;
+ const char *filename;
+ struct stat filestab;
+ YY_BUFFER_STATE ybuf;
+ struct parser_state *upstate;
+};
+
+static struct parser_state *cstate;
+
+struct error_handling {
+ int handling; /* One of the error handling modes tokt_ehandlemode */
+ int logfacility, loglevel;
+ int filekeep; /* File is in use by higher-level errors-push, leave it open */
+ FILE *file;
+ char *filename;
+};
+
+static struct error_handling eh = { tokv_word_errorstostderr, 0,0,0,0,0 };
+
+static int dequote(char *inplace);
+
+#define YY_NO_UNPUT
+
+
+/* Macros after this point can all be overridden by user definitions in
+ * section 1.
+ */
+
+#ifndef YY_SKIP_YYWRAP
+#ifdef __cplusplus
+extern "C" int yywrap YY_PROTO(( void ));
+#else
+extern int yywrap YY_PROTO(( void ));
+#endif
+#endif
+
+#ifndef YY_NO_UNPUT
+static void yyunput YY_PROTO(( int c, char *buf_ptr ));
+#endif
+
+#ifndef yytext_ptr
+static void yy_flex_strncpy YY_PROTO(( char *, yyconst char *, int ));
+#endif
+
+#ifdef YY_NEED_STRLEN
+static int yy_flex_strlen YY_PROTO(( yyconst char * ));
+#endif
+
+#ifndef YY_NO_INPUT
+#ifdef __cplusplus
+static int yyinput YY_PROTO(( void ));
+#else
+static int input YY_PROTO(( void ));
+#endif
+#endif
+
+#if YY_STACK_USED
+static int yy_start_stack_ptr = 0;
+static int yy_start_stack_depth = 0;
+static int *yy_start_stack = 0;
+#ifndef YY_NO_PUSH_STATE
+static void yy_push_state YY_PROTO(( int new_state ));
+#endif
+#ifndef YY_NO_POP_STATE
+static void yy_pop_state YY_PROTO(( void ));
+#endif
+#ifndef YY_NO_TOP_STATE
+static int yy_top_state YY_PROTO(( void ));
+#endif
+
+#else
+#define YY_NO_PUSH_STATE 1
+#define YY_NO_POP_STATE 1
+#define YY_NO_TOP_STATE 1
+#endif
+
+#ifdef YY_MALLOC_DECL
+YY_MALLOC_DECL
+#else
+#if __STDC__
+#ifndef __cplusplus
+#include <stdlib.h>
+#endif
+#else
+/* Just try to get by without declaring the routines. This will fail
+ * miserably on non-ANSI systems for which sizeof(size_t) != sizeof(int)
+ * or sizeof(void*) != sizeof(int).
+ */
+#endif
+#endif
+
+/* Amount of stuff to slurp up with each read. */
+#ifndef YY_READ_BUF_SIZE
+#define YY_READ_BUF_SIZE 8192
+#endif
+
+/* Copy whatever the last rule matched to the standard output. */
+
+#ifndef ECHO
+/* This used to be an fputs(), but since the string might contain NUL's,
+ * we now use fwrite().
+ */
+#define ECHO (void) fwrite( yytext, yyleng, 1, yyout )
+#endif
+
+/* Gets input and stuffs it into "buf". number of characters read, or YY_NULL,
+ * is returned in "result".
+ */
+#ifndef YY_INPUT
+#define YY_INPUT(buf,result,max_size) \
+ if ( yy_current_buffer->yy_is_interactive ) \
+ { \
+ int c = '*', n; \
+ for ( n = 0; n < max_size && \
+ (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
+ buf[n] = (char) c; \
+ if ( c == '\n' ) \
+ buf[n++] = (char) c; \
+ if ( c == EOF && ferror( yyin ) ) \
+ YY_FATAL_ERROR( "input in flex scanner failed" ); \
+ result = n; \
+ } \
+ else if ( ((result = fread( buf, 1, max_size, yyin )) == 0) \
+ && ferror( yyin ) ) \
+ YY_FATAL_ERROR( "input in flex scanner failed" );
+#endif
+
+/* No semi-colon after return; correct usage is to write "yyterminate();" -
+ * we don't want an extra ';' after the "return" because that will cause
+ * some compilers to complain about unreachable statements.
+ */
+#ifndef yyterminate
+#define yyterminate() return YY_NULL
+#endif
+
+/* Number of entries by which start-condition stack grows. */
+#ifndef YY_START_STACK_INCR
+#define YY_START_STACK_INCR 25
+#endif
+
+/* Report a fatal error. */
+#ifndef YY_FATAL_ERROR
+#define YY_FATAL_ERROR(msg) yy_fatal_error( msg )
+#endif
+
+/* Default declaration of generated scanner - a define so the user can
+ * easily add parameters.
+ */
+#ifndef YY_DECL
+#define YY_DECL int yylex YY_PROTO(( void ))
+#endif
+
+/* Code executed at the beginning of each rule, after yytext and yyleng
+ * have been set up.
+ */
+#ifndef YY_USER_ACTION
+#define YY_USER_ACTION
+#endif
+
+/* Code executed at the end of each rule. */
+#ifndef YY_BREAK
+#define YY_BREAK break;
+#endif
+
+#define YY_RULE_SETUP \
+ YY_USER_ACTION
+
+YY_DECL
+ {
+ register yy_state_type yy_current_state;
+ register char *yy_cp, *yy_bp;
+ register int yy_act;
+
+#line 142 "lexer.l"
+
+
+
+ if ( yy_init )
+ {
+ yy_init = 0;
+
+#ifdef YY_USER_INIT
+ YY_USER_INIT;
+#endif
+
+ if ( ! yy_start )
+ yy_start = 1; /* first start state */
+
+ if ( ! yyin )
+ yyin = stdin;
+
+ if ( ! yyout )
+ yyout = stdout;
+
+ if ( ! yy_current_buffer )
+ yy_current_buffer =
+ yy_create_buffer( yyin, YY_BUF_SIZE );
+
+ yy_load_buffer_state();
+ }
+
+ while ( 1 ) /* loops until end-of-file is reached */
+ {
+ yy_cp = yy_c_buf_p;
+
+ /* Support of yytext. */
+ *yy_cp = yy_hold_char;
+
+ /* yy_bp points to the position in yy_ch_buf of the start of
+ * the current run.
+ */
+ yy_bp = yy_cp;
+
+ yy_current_state = yy_start;
+yy_match:
+ do
+ {
+ register YY_CHAR yy_c = yy_ec[YY_SC_TO_UI(*yy_cp)];
+ if ( yy_accept[yy_current_state] )
+ {
+ yy_last_accepting_state = yy_current_state;
+ yy_last_accepting_cpos = yy_cp;
+ }
+ while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+ {
+ yy_current_state = (int) yy_def[yy_current_state];
+ if ( yy_current_state >= 572 )
+ yy_c = yy_meta[(unsigned int) yy_c];
+ }
+ yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+ ++yy_cp;
+ }
+ while ( yy_base[yy_current_state] != 918 );
+
+yy_find_action:
+ yy_act = yy_accept[yy_current_state];
+ if ( yy_act == 0 )
+ { /* have to back up */
+ yy_cp = yy_last_accepting_cpos;
+ yy_current_state = yy_last_accepting_state;
+ yy_act = yy_accept[yy_current_state];
+ }
+
+ YY_DO_BEFORE_ACTION;
+
+
+do_action: /* This label is used only to access EOF actions. */
+
+
+ switch ( yy_act )
+ { /* beginning of action switch */
+ case 0: /* must back up */
+ /* undo the effects of YY_DO_BEFORE_ACTION */
+ *yy_cp = yy_hold_char;
+ yy_cp = yy_last_accepting_cpos;
+ yy_current_state = yy_last_accepting_state;
+ goto yy_find_action;
+
+case 1:
+YY_RULE_SETUP
+#line 144 "lexer.l"
+{ lr_dir= df_reject; return tokv_word_reject; }
+ YY_BREAK
+case 2:
+YY_RULE_SETUP
+#line 145 "lexer.l"
+{ lr_dir= df_executefromdirectory; return tokv_word_executefromdirectory; }
+ YY_BREAK
+case 3:
+YY_RULE_SETUP
+#line 146 "lexer.l"
+{ lr_dir= df_executefrompath; return tokv_word_executefrompath; }
+ YY_BREAK
+case 4:
+YY_RULE_SETUP
+#line 147 "lexer.l"
+{ lr_dir= df_executebuiltin; return tokv_word_executebuiltin; }
+ YY_BREAK
+case 5:
+YY_RULE_SETUP
+#line 148 "lexer.l"
+{ lr_dir= df_errorstostderr; return tokv_word_errorstostderr; }
+ YY_BREAK
+case 6:
+YY_RULE_SETUP
+#line 149 "lexer.l"
+{ lr_dir= df_errorstosyslog; return tokv_word_errorstosyslog; }
+ YY_BREAK
+case 7:
+YY_RULE_SETUP
+#line 150 "lexer.l"
+{ lr_dir= df_errorstofile; return tokv_word_errorstofile; }
+ YY_BREAK
+case 8:
+YY_RULE_SETUP
+#line 151 "lexer.l"
+{ lr_dir= dfg_fdwant; lr_fdwant_readwrite=1; return tokv_word_requirefd; }
+ YY_BREAK
+case 9:
+YY_RULE_SETUP
+#line 152 "lexer.l"
+{ lr_dir= dfg_fdwant; lr_fdwant_readwrite=0; return tokv_word_allowfd; }
+ YY_BREAK
+case 10:
+YY_RULE_SETUP
+#line 153 "lexer.l"
+{ lr_dir= dfg_fdwant; lr_fdwant_readwrite=0; return tokv_word_nullfd; }
+ YY_BREAK
+case 11:
+YY_RULE_SETUP
+#line 154 "lexer.l"
+{ lr_dir= dfg_fdwant; lr_fdwant_readwrite=-1; return tokv_word_rejectfd; }
+ YY_BREAK
+case 12:
+YY_RULE_SETUP
+#line 155 "lexer.l"
+{ lr_dir= dfg_fdwant; lr_fdwant_readwrite=-1; return tokv_word_ignorefd; }
+ YY_BREAK
+case 13:
+YY_RULE_SETUP
+#line 156 "lexer.l"
+{ lr_dir= dfg_setflag; lr_flag= &setenvironment; lr_flagval= 1; return tokv_word_setenvironment; }
+ YY_BREAK
+case 14:
+YY_RULE_SETUP
+#line 157 "lexer.l"
+{ lr_dir= dfg_setflag; lr_flag= &setenvironment; lr_flagval= 0; return tokv_word_nosetenvironment; }
+ YY_BREAK
+case 15:
+YY_RULE_SETUP
+#line 158 "lexer.l"
+{ lr_dir= dfg_setflag; lr_flag= &suppressargs; lr_flagval= 1; return tokv_word_suppressargs; }
+ YY_BREAK
+case 16:
+YY_RULE_SETUP
+#line 159 "lexer.l"
+{ lr_dir= dfg_setflag; lr_flag= &suppressargs; lr_flagval= 0; return tokv_word_nosuppressargs; }
+ YY_BREAK
+case 17:
+YY_RULE_SETUP
+#line 160 "lexer.l"
+{ lr_dir= dfg_setflag; lr_flag= &disconnecthup; lr_flagval= 1; return tokv_word_disconnecthup; }
+ YY_BREAK
+case 18:
+YY_RULE_SETUP
+#line 161 "lexer.l"
+{ lr_dir= dfg_setflag; lr_flag= &disconnecthup; lr_flagval= 0; return tokv_word_nodisconnecthup; }
+ YY_BREAK
+case 19:
+YY_RULE_SETUP
+#line 162 "lexer.l"
+{ lr_dir= df_cd; return tokv_word_cd; }
+ YY_BREAK
+case 20:
+YY_RULE_SETUP
+#line 163 "lexer.l"
+{ lr_dir= df_userrcfile; return tokv_word_userrcfile; }
+ YY_BREAK
+case 21:
+YY_RULE_SETUP
+#line 164 "lexer.l"
+{ lr_dir= df_include; return tokv_word_include; }
+ YY_BREAK
+case 22:
+YY_RULE_SETUP
+#line 165 "lexer.l"
+{ lr_dir= df_include; return tokv_word_includeifexist; }
+ YY_BREAK
+case 23:
+YY_RULE_SETUP
+#line 166 "lexer.l"
+{ lr_dir= df_includelookup; return tokv_word_includelookup; }
+ YY_BREAK
+case 24:
+YY_RULE_SETUP
+#line 167 "lexer.l"
+{ lr_dir= df_includelookup; return tokv_word_includelookupall; }
+ YY_BREAK
+case 25:
+YY_RULE_SETUP
+#line 168 "lexer.l"
+{ lr_dir= df_includedirectory; return tokv_word_includedirectory; }
+ YY_BREAK
+case 26:
+YY_RULE_SETUP
+#line 169 "lexer.l"
+{ lr_dir= df_message; return tokv_word_message; }
+ YY_BREAK
+case 27:
+YY_RULE_SETUP
+#line 170 "lexer.l"
+{ lr_dir= df_include; return tokv_word_includesysconfig; }
+ YY_BREAK
+case 28:
+YY_RULE_SETUP
+#line 171 "lexer.l"
+{ lr_dir= dfi_includeuserrcfile; return tokv_word_includeuserrcfile; }
+ YY_BREAK
+case 29:
+YY_RULE_SETUP
+#line 172 "lexer.l"
+{ lr_dir= dfi_includeclientconfig; return tokv_word_includeclientconfig; }
+ YY_BREAK
+case 30:
+YY_RULE_SETUP
+#line 173 "lexer.l"
+{ lr_dir= df_quit; return tokv_word_quit; }
+ YY_BREAK
+case 31:
+YY_RULE_SETUP
+#line 174 "lexer.l"
+{ lr_dir= df_eof; return tokv_word_eof; }
+ YY_BREAK
+case 32:
+YY_RULE_SETUP
+#line 175 "lexer.l"
+{ lr_dir= df_if; return tokv_word_if; }
+ YY_BREAK
+case 33:
+YY_RULE_SETUP
+#line 176 "lexer.l"
+{ lr_dir= df_catchquit; return tokv_word_catchquit; }
+ YY_BREAK
+case 34:
+YY_RULE_SETUP
+#line 177 "lexer.l"
+{ lr_dir= df_errorspush; return tokv_word_errorspush; }
+ YY_BREAK
+case 35:
+YY_RULE_SETUP
+#line 178 "lexer.l"
+{ lr_controlend= tokv_word_if; return tokv_word_elif; }
+ YY_BREAK
+case 36:
+YY_RULE_SETUP
+#line 179 "lexer.l"
+{ lr_controlend= tokv_word_if; return tokv_word_else; }
+ YY_BREAK
+case 37:
+YY_RULE_SETUP
+#line 180 "lexer.l"
+{ lr_controlend= tokv_word_if; return tokv_word_fi; }
+ YY_BREAK
+case 38:
+YY_RULE_SETUP
+#line 181 "lexer.l"
+{ lr_controlend= tokv_word_catchquit; return tokv_word_hctac; }
+ YY_BREAK
+case 39:
+YY_RULE_SETUP
+#line 182 "lexer.l"
+{ lr_controlend= tokv_word_errorspush; return tokv_word_srorre; }
+ YY_BREAK
+case 40:
+YY_RULE_SETUP
+#line 183 "lexer.l"
+{ lr_parmcond= pcf_glob; return tokv_word_glob; }
+ YY_BREAK
+case 41:
+YY_RULE_SETUP
+#line 184 "lexer.l"
+{ lr_parmcond= pcf_range; return tokv_word_range; }
+ YY_BREAK
+case 42:
+YY_RULE_SETUP
+#line 185 "lexer.l"
+{ lr_parmcond= pcf_grep; return tokv_word_grep; }
+ YY_BREAK
+case 43:
+YY_RULE_SETUP
+#line 186 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_environment; return tokv_word_environment; }
+ YY_BREAK
+case 44:
+YY_RULE_SETUP
+#line 187 "lexer.l"
+{ lr_bispa= bispa_parameter; lr_bisexec= bisexec_parameter; return tokv_word_parameter; }
+ YY_BREAK
+case 45:
+YY_RULE_SETUP
+#line 188 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_version; return tokv_word_version; }
+ YY_BREAK
+case 46:
+YY_RULE_SETUP
+#line 189 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_toplevel; return tokv_word_toplevel; }
+ YY_BREAK
+case 47:
+YY_RULE_SETUP
+#line 190 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_override; return tokv_word_override; }
+ YY_BREAK
+case 48:
+YY_RULE_SETUP
+#line 191 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_reset; lr_dir= df_reset; return tokv_word_reset; }
+ YY_BREAK
+case 49:
+YY_RULE_SETUP
+#line 192 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_execute; lr_dir= df_execute; return tokv_word_execute; }
+ YY_BREAK
+case 50:
+YY_RULE_SETUP
+#line 193 "lexer.l"
+{ lr_bispa= bispa_none; lr_bisexec= bisexec_help; return tokv_word_help; }
+ YY_BREAK
+case 51:
+YY_RULE_SETUP
+#line 194 "lexer.l"
+{ lr_parameter= pf_service; return tokv_word_service; }
+ YY_BREAK
+case 52:
+YY_RULE_SETUP
+#line 195 "lexer.l"
+{ lr_parameter= pf_callinguser; return tokv_word_callinguser; }
+ YY_BREAK
+case 53:
+YY_RULE_SETUP
+#line 196 "lexer.l"
+{ lr_parameter= pf_callinggroup; return tokv_word_callinggroup; }
+ YY_BREAK
+case 54:
+YY_RULE_SETUP
+#line 197 "lexer.l"
+{ lr_parameter= pf_callingusershell; return tokv_word_callingusershell; }
+ YY_BREAK
+case 55:
+YY_RULE_SETUP
+#line 198 "lexer.l"
+{ lr_parameter= pf_serviceuser; return tokv_word_serviceuser; }
+ YY_BREAK
+case 56:
+YY_RULE_SETUP
+#line 199 "lexer.l"
+{ lr_parameter= pf_servicegroup; return tokv_word_servicegroup; }
+ YY_BREAK
+case 57:
+YY_RULE_SETUP
+#line 200 "lexer.l"
+{ lr_parameter= pf_serviceusershell; return tokv_word_serviceusershell; }
+ YY_BREAK
+case 58:
+YY_RULE_SETUP
+#line 201 "lexer.l"
+{ lr_loglevel= LOG_DEBUG; return tokv_syslog_debug; }
+ YY_BREAK
+case 59:
+YY_RULE_SETUP
+#line 202 "lexer.l"
+{ lr_loglevel= LOG_INFO; return tokv_syslog_info; }
+ YY_BREAK
+case 60:
+YY_RULE_SETUP
+#line 203 "lexer.l"
+{ lr_loglevel= LOG_NOTICE; return tokv_syslog_notice; }
+ YY_BREAK
+case 61:
+YY_RULE_SETUP
+#line 204 "lexer.l"
+{ lr_loglevel= LOG_WARNING; return tokv_syslog_warning; }
+ YY_BREAK
+case 62:
+YY_RULE_SETUP
+#line 205 "lexer.l"
+{ lr_loglevel= LOG_ERR; return tokv_syslog_err; }
+ YY_BREAK
+case 63:
+YY_RULE_SETUP
+#line 206 "lexer.l"
+{ lr_loglevel= LOG_CRIT; return tokv_syslog_crit; }
+ YY_BREAK
+case 64:
+YY_RULE_SETUP
+#line 207 "lexer.l"
+{ lr_loglevel= LOG_ALERT; return tokv_syslog_alert; }
+ YY_BREAK
+case 65:
+YY_RULE_SETUP
+#line 208 "lexer.l"
+{ lr_loglevel= LOG_EMERG; return tokv_syslog_emerg; }
+ YY_BREAK
+case 66:
+YY_RULE_SETUP
+#line 209 "lexer.l"
+{ lr_logfacility= LOG_AUTHPRIV; return tokv_syslog_authpriv; }
+ YY_BREAK
+case 67:
+YY_RULE_SETUP
+#line 210 "lexer.l"
+{ lr_logfacility= LOG_CRON; return tokv_syslog_cron; }
+ YY_BREAK
+case 68:
+YY_RULE_SETUP
+#line 211 "lexer.l"
+{ lr_logfacility= LOG_DAEMON; return tokv_syslog_daemon; }
+ YY_BREAK
+case 69:
+YY_RULE_SETUP
+#line 212 "lexer.l"
+{ lr_logfacility= LOG_KERN; return tokv_syslog_kern; }
+ YY_BREAK
+case 70:
+YY_RULE_SETUP
+#line 213 "lexer.l"
+{ lr_logfacility= LOG_LPR; return tokv_syslog_lpr; }
+ YY_BREAK
+case 71:
+YY_RULE_SETUP
+#line 214 "lexer.l"
+{ lr_logfacility= LOG_MAIL; return tokv_syslog_mail; }
+ YY_BREAK
+case 72:
+YY_RULE_SETUP
+#line 215 "lexer.l"
+{ lr_logfacility= LOG_NEWS; return tokv_syslog_news; }
+ YY_BREAK
+case 73:
+YY_RULE_SETUP
+#line 216 "lexer.l"
+{ lr_logfacility= LOG_SYSLOG; return tokv_syslog_syslog; }
+ YY_BREAK
+case 74:
+YY_RULE_SETUP
+#line 217 "lexer.l"
+{ lr_logfacility= LOG_USER; return tokv_syslog_user; }
+ YY_BREAK
+case 75:
+YY_RULE_SETUP
+#line 218 "lexer.l"
+{ lr_logfacility= LOG_UUCP; return tokv_syslog_uucp; }
+ YY_BREAK
+case 76:
+YY_RULE_SETUP
+#line 219 "lexer.l"
+{ lr_logfacility= LOG_LOCAL0; return tokv_syslog_local0; }
+ YY_BREAK
+case 77:
+YY_RULE_SETUP
+#line 220 "lexer.l"
+{ lr_logfacility= LOG_LOCAL1; return tokv_syslog_local1; }
+ YY_BREAK
+case 78:
+YY_RULE_SETUP
+#line 221 "lexer.l"
+{ lr_logfacility= LOG_LOCAL2; return tokv_syslog_local2; }
+ YY_BREAK
+case 79:
+YY_RULE_SETUP
+#line 222 "lexer.l"
+{ lr_logfacility= LOG_LOCAL3; return tokv_syslog_local3; }
+ YY_BREAK
+case 80:
+YY_RULE_SETUP
+#line 223 "lexer.l"
+{ lr_logfacility= LOG_LOCAL4; return tokv_syslog_local4; }
+ YY_BREAK
+case 81:
+YY_RULE_SETUP
+#line 224 "lexer.l"
+{ lr_logfacility= LOG_LOCAL5; return tokv_syslog_local5; }
+ YY_BREAK
+case 82:
+YY_RULE_SETUP
+#line 225 "lexer.l"
+{ lr_logfacility= LOG_LOCAL6; return tokv_syslog_local6; }
+ YY_BREAK
+case 83:
+YY_RULE_SETUP
+#line 226 "lexer.l"
+{ lr_logfacility= LOG_LOCAL7; return tokv_syslog_local7; }
+ YY_BREAK
+case 84:
+YY_RULE_SETUP
+#line 227 "lexer.l"
+{ return tokv_word_read; }
+ YY_BREAK
+case 85:
+YY_RULE_SETUP
+#line 228 "lexer.l"
+{ return tokv_word_write; }
+ YY_BREAK
+case 86:
+YY_RULE_SETUP
+#line 229 "lexer.l"
+{ return tokv_dollar; }
+ YY_BREAK
+case 87:
+YY_RULE_SETUP
+#line 230 "lexer.l"
+{ return tokv_openparen; }
+ YY_BREAK
+case 88:
+YY_RULE_SETUP
+#line 231 "lexer.l"
+{ return tokv_closeparen; }
+ YY_BREAK
+case 89:
+YY_RULE_SETUP
+#line 232 "lexer.l"
+{ return tokv_not; }
+ YY_BREAK
+case 90:
+YY_RULE_SETUP
+#line 233 "lexer.l"
+{ return tokv_and; }
+ YY_BREAK
+case 91:
+YY_RULE_SETUP
+#line 234 "lexer.l"
+{ return tokv_or; }
+ YY_BREAK
+case 92:
+YY_RULE_SETUP
+#line 235 "lexer.l"
+{ lr_dir= df_error; lr_loglevel= LOG_ERR; return tokv_word_error; }
+ YY_BREAK
+case 93:
+YY_RULE_SETUP
+#line 239 "lexer.l"
+{
+ char *ep;
+ lr_min=lr_max= (int)strtoul(yytext,&ep,10);
+ assert(!*ep);
+ return tokv_ordinal;
+ }
+ YY_BREAK
+case 94:
+YY_RULE_SETUP
+#line 245 "lexer.l"
+{
+ char *ep;
+ lr_min= (int)strtoul(yytext,&ep,10);
+ assert(*ep == HYPHEN);
+ assert(*++ep);
+ lr_max= (int)strtoul(ep,&ep,10);
+ assert(!*ep);
+ if (lr_max < lr_min) {
+ parseerrprint("fd range has min > max");
+ return tokv_error;
+ }
+ return tokv_fdrange;
+ }
+ YY_BREAK
+case 95:
+YY_RULE_SETUP
+#line 258 "lexer.l"
+{
+ char *ep;
+ lr_min= (int)strtoul(yytext,&ep,10);
+ assert(*ep == HYPHEN);
+ assert(!*++ep);
+ lr_max=-1;
+ return tokv_fdstoend;
+ }
+ YY_BREAK
+case 96:
+YY_RULE_SETUP
+#line 266 "lexer.l"
+return tokv_lwsp;
+ YY_BREAK
+case 97:
+YY_RULE_SETUP
+#line 267 "lexer.l"
+cstate->lineno++; return tokv_newline;
+ YY_BREAK
+case 98:
+YY_RULE_SETUP
+#line 268 "lexer.l"
+cstate->lineno++; return tokv_newline;
+ YY_BREAK
+case 99:
+YY_RULE_SETUP
+#line 269 "lexer.l"
+{
+ parseerrprint("missing newline at eof after comment");
+ return tokv_error;
+ }
+ YY_BREAK
+case 100:
+YY_RULE_SETUP
+#line 273 "lexer.l"
+{
+ return dequote(yytext);
+ }
+ YY_BREAK
+case 101:
+YY_RULE_SETUP
+#line 276 "lexer.l"
+{
+ parseerrprint("misquoted or unterminated string");
+ return tokv_error;
+ }
+ YY_BREAK
+case 102:
+YY_RULE_SETUP
+#line 280 "lexer.l"
+return tokv_barestring;
+ YY_BREAK
+case YY_STATE_EOF(INITIAL):
+#line 281 "lexer.l"
+return tokv_eof;
+ YY_BREAK
+case 103:
+YY_RULE_SETUP
+#line 284 "lexer.l"
+ECHO;
+ YY_BREAK
+
+ case YY_END_OF_BUFFER:
+ {
+ /* Amount of text matched not including the EOB char. */
+ int yy_amount_of_matched_text = (int) (yy_cp - yytext_ptr) - 1;
+
+ /* Undo the effects of YY_DO_BEFORE_ACTION. */
+ *yy_cp = yy_hold_char;
+ YY_RESTORE_YY_MORE_OFFSET
+
+ if ( yy_current_buffer->yy_buffer_status == YY_BUFFER_NEW )
+ {
+ /* We're scanning a new file or input source. It's
+ * possible that this happened because the user
+ * just pointed yyin at a new source and called
+ * yylex(). If so, then we have to assure
+ * consistency between yy_current_buffer and our
+ * globals. Here is the right place to do so, because
+ * this is the first action (other than possibly a
+ * back-up) that will match for the new input source.
+ */
+ yy_n_chars = yy_current_buffer->yy_n_chars;
+ yy_current_buffer->yy_input_file = yyin;
+ yy_current_buffer->yy_buffer_status = YY_BUFFER_NORMAL;
+ }
+
+ /* Note that here we test for yy_c_buf_p "<=" to the position
+ * of the first EOB in the buffer, since yy_c_buf_p will
+ * already have been incremented past the NUL character
+ * (since all states make transitions on EOB to the
+ * end-of-buffer state). Contrast this with the test
+ * in input().
+ */
+ if ( yy_c_buf_p <= &yy_current_buffer->yy_ch_buf[yy_n_chars] )
+ { /* This was really a NUL. */
+ yy_state_type yy_next_state;
+
+ yy_c_buf_p = yytext_ptr + yy_amount_of_matched_text;
+
+ yy_current_state = yy_get_previous_state();
+
+ /* Okay, we're now positioned to make the NUL
+ * transition. We couldn't have
+ * yy_get_previous_state() go ahead and do it
+ * for us because it doesn't know how to deal
+ * with the possibility of jamming (and we don't
+ * want to build jamming into it because then it
+ * will run more slowly).
+ */
+
+ yy_next_state = yy_try_NUL_trans( yy_current_state );
+
+ yy_bp = yytext_ptr + YY_MORE_ADJ;
+
+ if ( yy_next_state )
+ {
+ /* Consume the NUL. */
+ yy_cp = ++yy_c_buf_p;
+ yy_current_state = yy_next_state;
+ goto yy_match;
+ }
+
+ else
+ {
+ yy_cp = yy_c_buf_p;
+ goto yy_find_action;
+ }
+ }
+
+ else switch ( yy_get_next_buffer() )
+ {
+ case EOB_ACT_END_OF_FILE:
+ {
+ yy_did_buffer_switch_on_eof = 0;
+
+ if ( yywrap() )
+ {
+ /* Note: because we've taken care in
+ * yy_get_next_buffer() to have set up
+ * yytext, we can now set up
+ * yy_c_buf_p so that if some total
+ * hoser (like flex itself) wants to
+ * call the scanner after we return the
+ * YY_NULL, it'll still work - another
+ * YY_NULL will get returned.
+ */
+ yy_c_buf_p = yytext_ptr + YY_MORE_ADJ;
+
+ yy_act = YY_STATE_EOF(YY_START);
+ goto do_action;
+ }
+
+ else
+ {
+ if ( ! yy_did_buffer_switch_on_eof )
+ YY_NEW_FILE;
+ }
+ break;
+ }
+
+ case EOB_ACT_CONTINUE_SCAN:
+ yy_c_buf_p =
+ yytext_ptr + yy_amount_of_matched_text;
+
+ yy_current_state = yy_get_previous_state();
+
+ yy_cp = yy_c_buf_p;
+ yy_bp = yytext_ptr + YY_MORE_ADJ;
+ goto yy_match;
+
+ case EOB_ACT_LAST_MATCH:
+ yy_c_buf_p =
+ &yy_current_buffer->yy_ch_buf[yy_n_chars];
+
+ yy_current_state = yy_get_previous_state();
+
+ yy_cp = yy_c_buf_p;
+ yy_bp = yytext_ptr + YY_MORE_ADJ;
+ goto yy_find_action;
+ }
+ break;
+ }
+
+ default:
+ YY_FATAL_ERROR(
+ "fatal flex scanner internal error--no action found" );
+ } /* end of action switch */
+ } /* end of scanning one token */
+ } /* end of yylex */
+
+
+/* yy_get_next_buffer - try to read in a new buffer
+ *
+ * Returns a code representing an action:
+ * EOB_ACT_LAST_MATCH -
+ * EOB_ACT_CONTINUE_SCAN - continue scanning from current position
+ * EOB_ACT_END_OF_FILE - end of file
+ */
+
+static int yy_get_next_buffer()
+ {
+ register char *dest = yy_current_buffer->yy_ch_buf;
+ register char *source = yytext_ptr;
+ register int number_to_move, i;
+ int ret_val;
+
+ if ( yy_c_buf_p > &yy_current_buffer->yy_ch_buf[yy_n_chars + 1] )
+ YY_FATAL_ERROR(
+ "fatal flex scanner internal error--end of buffer missed" );
+
+ if ( yy_current_buffer->yy_fill_buffer == 0 )
+ { /* Don't try to fill the buffer, so this is an EOF. */
+ if ( yy_c_buf_p - yytext_ptr - YY_MORE_ADJ == 1 )
+ {
+ /* We matched a single character, the EOB, so
+ * treat this as a final EOF.
+ */
+ return EOB_ACT_END_OF_FILE;
+ }
+
+ else
+ {
+ /* We matched some text prior to the EOB, first
+ * process it.
+ */
+ return EOB_ACT_LAST_MATCH;
+ }
+ }
+
+ /* Try to read more data. */
+
+ /* First move last chars to start of buffer. */
+ number_to_move = (int) (yy_c_buf_p - yytext_ptr) - 1;
+
+ for ( i = 0; i < number_to_move; ++i )
+ *(dest++) = *(source++);
+
+ if ( yy_current_buffer->yy_buffer_status == YY_BUFFER_EOF_PENDING )
+ /* don't do the read, it's not guaranteed to return an EOF,
+ * just force an EOF
+ */
+ yy_current_buffer->yy_n_chars = yy_n_chars = 0;
+
+ else
+ {
+ int num_to_read =
+ yy_current_buffer->yy_buf_size - number_to_move - 1;
+
+ while ( num_to_read <= 0 )
+ { /* Not enough room in the buffer - grow it. */
+#ifdef YY_USES_REJECT
+ YY_FATAL_ERROR(
+"input buffer overflow, can't enlarge buffer because scanner uses REJECT" );
+#else
+
+ /* just a shorter name for the current buffer */
+ YY_BUFFER_STATE b = yy_current_buffer;
+
+ int yy_c_buf_p_offset =
+ (int) (yy_c_buf_p - b->yy_ch_buf);
+
+ if ( b->yy_is_our_buffer )
+ {
+ int new_size = b->yy_buf_size * 2;
+
+ if ( new_size <= 0 )
+ b->yy_buf_size += b->yy_buf_size / 8;
+ else
+ b->yy_buf_size *= 2;
+
+ b->yy_ch_buf = (char *)
+ /* Include room in for 2 EOB chars. */
+ yy_flex_realloc( (void *) b->yy_ch_buf,
+ b->yy_buf_size + 2 );
+ }
+ else
+ /* Can't grow it, we don't own it. */
+ b->yy_ch_buf = 0;
+
+ if ( ! b->yy_ch_buf )
+ YY_FATAL_ERROR(
+ "fatal error - scanner input buffer overflow" );
+
+ yy_c_buf_p = &b->yy_ch_buf[yy_c_buf_p_offset];
+
+ num_to_read = yy_current_buffer->yy_buf_size -
+ number_to_move - 1;
+#endif
+ }
+
+ if ( num_to_read > YY_READ_BUF_SIZE )
+ num_to_read = YY_READ_BUF_SIZE;
+
+ /* Read in more data. */
+ YY_INPUT( (&yy_current_buffer->yy_ch_buf[number_to_move]),
+ yy_n_chars, num_to_read );
+
+ yy_current_buffer->yy_n_chars = yy_n_chars;
+ }
+
+ if ( yy_n_chars == 0 )
+ {
+ if ( number_to_move == YY_MORE_ADJ )
+ {
+ ret_val = EOB_ACT_END_OF_FILE;
+ yyrestart( yyin );
+ }
+
+ else
+ {
+ ret_val = EOB_ACT_LAST_MATCH;
+ yy_current_buffer->yy_buffer_status =
+ YY_BUFFER_EOF_PENDING;
+ }
+ }
+
+ else
+ ret_val = EOB_ACT_CONTINUE_SCAN;
+
+ yy_n_chars += number_to_move;
+ yy_current_buffer->yy_ch_buf[yy_n_chars] = YY_END_OF_BUFFER_CHAR;
+ yy_current_buffer->yy_ch_buf[yy_n_chars + 1] = YY_END_OF_BUFFER_CHAR;
+
+ yytext_ptr = &yy_current_buffer->yy_ch_buf[0];
+
+ return ret_val;
+ }
+
+
+/* yy_get_previous_state - get the state just before the EOB char was reached */
+
+static yy_state_type yy_get_previous_state()
+ {
+ register yy_state_type yy_current_state;
+ register char *yy_cp;
+
+ yy_current_state = yy_start;
+
+ for ( yy_cp = yytext_ptr + YY_MORE_ADJ; yy_cp < yy_c_buf_p; ++yy_cp )
+ {
+ register YY_CHAR yy_c = (*yy_cp ? yy_ec[YY_SC_TO_UI(*yy_cp)] : 1);
+ if ( yy_accept[yy_current_state] )
+ {
+ yy_last_accepting_state = yy_current_state;
+ yy_last_accepting_cpos = yy_cp;
+ }
+ while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+ {
+ yy_current_state = (int) yy_def[yy_current_state];
+ if ( yy_current_state >= 572 )
+ yy_c = yy_meta[(unsigned int) yy_c];
+ }
+ yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+ }
+
+ return yy_current_state;
+ }
+
+
+/* yy_try_NUL_trans - try to make a transition on the NUL character
+ *
+ * synopsis
+ * next_state = yy_try_NUL_trans( current_state );
+ */
+
+#ifdef YY_USE_PROTOS
+static yy_state_type yy_try_NUL_trans( yy_state_type yy_current_state )
+#else
+static yy_state_type yy_try_NUL_trans( yy_current_state )
+yy_state_type yy_current_state;
+#endif
+ {
+ register int yy_is_jam;
+ register char *yy_cp = yy_c_buf_p;
+
+ register YY_CHAR yy_c = 1;
+ if ( yy_accept[yy_current_state] )
+ {
+ yy_last_accepting_state = yy_current_state;
+ yy_last_accepting_cpos = yy_cp;
+ }
+ while ( yy_chk[yy_base[yy_current_state] + yy_c] != yy_current_state )
+ {
+ yy_current_state = (int) yy_def[yy_current_state];
+ if ( yy_current_state >= 572 )
+ yy_c = yy_meta[(unsigned int) yy_c];
+ }
+ yy_current_state = yy_nxt[yy_base[yy_current_state] + (unsigned int) yy_c];
+ yy_is_jam = (yy_current_state == 571);
+
+ return yy_is_jam ? 0 : yy_current_state;
+ }
+
+
+#ifndef YY_NO_UNPUT
+#ifdef YY_USE_PROTOS
+static void yyunput( int c, register char *yy_bp )
+#else
+static void yyunput( c, yy_bp )
+int c;
+register char *yy_bp;
+#endif
+ {
+ register char *yy_cp = yy_c_buf_p;
+
+ /* undo effects of setting up yytext */
+ *yy_cp = yy_hold_char;
+
+ if ( yy_cp < yy_current_buffer->yy_ch_buf + 2 )
+ { /* need to shift things up to make room */
+ /* +2 for EOB chars. */
+ register int number_to_move = yy_n_chars + 2;
+ register char *dest = &yy_current_buffer->yy_ch_buf[
+ yy_current_buffer->yy_buf_size + 2];
+ register char *source =
+ &yy_current_buffer->yy_ch_buf[number_to_move];
+
+ while ( source > yy_current_buffer->yy_ch_buf )
+ *--dest = *--source;
+
+ yy_cp += (int) (dest - source);
+ yy_bp += (int) (dest - source);
+ yy_current_buffer->yy_n_chars =
+ yy_n_chars = yy_current_buffer->yy_buf_size;
+
+ if ( yy_cp < yy_current_buffer->yy_ch_buf + 2 )
+ YY_FATAL_ERROR( "flex scanner push-back overflow" );
+ }
+
+ *--yy_cp = (char) c;
+
+
+ yytext_ptr = yy_bp;
+ yy_hold_char = *yy_cp;
+ yy_c_buf_p = yy_cp;
+ }
+#endif /* ifndef YY_NO_UNPUT */
+
+
+#ifdef __cplusplus
+static int yyinput()
+#else
+static int input()
+#endif
+ {
+ int c;
+
+ *yy_c_buf_p = yy_hold_char;
+
+ if ( *yy_c_buf_p == YY_END_OF_BUFFER_CHAR )
+ {
+ /* yy_c_buf_p now points to the character we want to return.
+ * If this occurs *before* the EOB characters, then it's a
+ * valid NUL; if not, then we've hit the end of the buffer.
+ */
+ if ( yy_c_buf_p < &yy_current_buffer->yy_ch_buf[yy_n_chars] )
+ /* This was really a NUL. */
+ *yy_c_buf_p = '\0';
+
+ else
+ { /* need more input */
+ int offset = yy_c_buf_p - yytext_ptr;
+ ++yy_c_buf_p;
+
+ switch ( yy_get_next_buffer() )
+ {
+ case EOB_ACT_LAST_MATCH:
+ /* This happens because yy_g_n_b()
+ * sees that we've accumulated a
+ * token and flags that we need to
+ * try matching the token before
+ * proceeding. But for input(),
+ * there's no matching to consider.
+ * So convert the EOB_ACT_LAST_MATCH
+ * to EOB_ACT_END_OF_FILE.
+ */
+
+ /* Reset buffer status. */
+ yyrestart( yyin );
+
+ /* fall through */
+
+ case EOB_ACT_END_OF_FILE:
+ {
+ if ( yywrap() )
+ return EOF;
+
+ if ( ! yy_did_buffer_switch_on_eof )
+ YY_NEW_FILE;
+#ifdef __cplusplus
+ return yyinput();
+#else
+ return input();
+#endif
+ }
+
+ case EOB_ACT_CONTINUE_SCAN:
+ yy_c_buf_p = yytext_ptr + offset;
+ break;
+ }
+ }
+ }
+
+ c = *(unsigned char *) yy_c_buf_p; /* cast for 8-bit char's */
+ *yy_c_buf_p = '\0'; /* preserve yytext */
+ yy_hold_char = *++yy_c_buf_p;
+
+
+ return c;
+ }
+
+
+#ifdef YY_USE_PROTOS
+void yyrestart( FILE *input_file )
+#else
+void yyrestart( input_file )
+FILE *input_file;
+#endif
+ {
+ if ( ! yy_current_buffer )
+ yy_current_buffer = yy_create_buffer( yyin, YY_BUF_SIZE );
+
+ yy_init_buffer( yy_current_buffer, input_file );
+ yy_load_buffer_state();
+ }
+
+
+#ifdef YY_USE_PROTOS
+void yy_switch_to_buffer( YY_BUFFER_STATE new_buffer )
+#else
+void yy_switch_to_buffer( new_buffer )
+YY_BUFFER_STATE new_buffer;
+#endif
+ {
+ if ( yy_current_buffer == new_buffer )
+ return;
+
+ if ( yy_current_buffer )
+ {
+ /* Flush out information for old buffer. */
+ *yy_c_buf_p = yy_hold_char;
+ yy_current_buffer->yy_buf_pos = yy_c_buf_p;
+ yy_current_buffer->yy_n_chars = yy_n_chars;
+ }
+
+ yy_current_buffer = new_buffer;
+ yy_load_buffer_state();
+
+ /* We don't actually know whether we did this switch during
+ * EOF (yywrap()) processing, but the only time this flag
+ * is looked at is after yywrap() is called, so it's safe
+ * to go ahead and always set it.
+ */
+ yy_did_buffer_switch_on_eof = 1;
+ }
+
+
+#ifdef YY_USE_PROTOS
+void yy_load_buffer_state( void )
+#else
+void yy_load_buffer_state()
+#endif
+ {
+ yy_n_chars = yy_current_buffer->yy_n_chars;
+ yytext_ptr = yy_c_buf_p = yy_current_buffer->yy_buf_pos;
+ yyin = yy_current_buffer->yy_input_file;
+ yy_hold_char = *yy_c_buf_p;
+ }
+
+
+#ifdef YY_USE_PROTOS
+YY_BUFFER_STATE yy_create_buffer( FILE *file, int size )
+#else
+YY_BUFFER_STATE yy_create_buffer( file, size )
+FILE *file;
+int size;
+#endif
+ {
+ YY_BUFFER_STATE b;
+
+ b = (YY_BUFFER_STATE) yy_flex_alloc( sizeof( struct yy_buffer_state ) );
+ if ( ! b )
+ YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+ b->yy_buf_size = size;
+
+ /* yy_ch_buf has to be 2 characters longer than the size given because
+ * we need to put in 2 end-of-buffer characters.
+ */
+ b->yy_ch_buf = (char *) yy_flex_alloc( b->yy_buf_size + 2 );
+ if ( ! b->yy_ch_buf )
+ YY_FATAL_ERROR( "out of dynamic memory in yy_create_buffer()" );
+
+ b->yy_is_our_buffer = 1;
+
+ yy_init_buffer( b, file );
+
+ return b;
+ }
+
+
+#ifdef YY_USE_PROTOS
+void yy_delete_buffer( YY_BUFFER_STATE b )
+#else
+void yy_delete_buffer( b )
+YY_BUFFER_STATE b;
+#endif
+ {
+ if ( ! b )
+ return;
+
+ if ( b == yy_current_buffer )
+ yy_current_buffer = (YY_BUFFER_STATE) 0;
+
+ if ( b->yy_is_our_buffer )
+ yy_flex_free( (void *) b->yy_ch_buf );
+
+ yy_flex_free( (void *) b );
+ }
+
+
+#ifndef YY_ALWAYS_INTERACTIVE
+#ifndef YY_NEVER_INTERACTIVE
+extern int isatty YY_PROTO(( int ));
+#endif
+#endif
+
+#ifdef YY_USE_PROTOS
+void yy_init_buffer( YY_BUFFER_STATE b, FILE *file )
+#else
+void yy_init_buffer( b, file )
+YY_BUFFER_STATE b;
+FILE *file;
+#endif
+
+
+ {
+ yy_flush_buffer( b );
+
+ b->yy_input_file = file;
+ b->yy_fill_buffer = 1;
+
+#if YY_ALWAYS_INTERACTIVE
+ b->yy_is_interactive = 1;
+#else
+#if YY_NEVER_INTERACTIVE
+ b->yy_is_interactive = 0;
+#else
+ b->yy_is_interactive = file ? (isatty( fileno(file) ) > 0) : 0;
+#endif
+#endif
+ }
+
+
+#ifdef YY_USE_PROTOS
+void yy_flush_buffer( YY_BUFFER_STATE b )
+#else
+void yy_flush_buffer( b )
+YY_BUFFER_STATE b;
+#endif
+
+ {
+ if ( ! b )
+ return;
+
+ b->yy_n_chars = 0;
+
+ /* We always need two end-of-buffer characters. The first causes
+ * a transition to the end-of-buffer state. The second causes
+ * a jam in that state.
+ */
+ b->yy_ch_buf[0] = YY_END_OF_BUFFER_CHAR;
+ b->yy_ch_buf[1] = YY_END_OF_BUFFER_CHAR;
+
+ b->yy_buf_pos = &b->yy_ch_buf[0];
+
+ b->yy_at_bol = 1;
+ b->yy_buffer_status = YY_BUFFER_NEW;
+
+ if ( b == yy_current_buffer )
+ yy_load_buffer_state();
+ }
+
+
+#ifndef YY_NO_SCAN_BUFFER
+#ifdef YY_USE_PROTOS
+YY_BUFFER_STATE yy_scan_buffer( char *base, yy_size_t size )
+#else
+YY_BUFFER_STATE yy_scan_buffer( base, size )
+char *base;
+yy_size_t size;
+#endif
+ {
+ YY_BUFFER_STATE b;
+
+ if ( size < 2 ||
+ base[size-2] != YY_END_OF_BUFFER_CHAR ||
+ base[size-1] != YY_END_OF_BUFFER_CHAR )
+ /* They forgot to leave room for the EOB's. */
+ return 0;
+
+ b = (YY_BUFFER_STATE) yy_flex_alloc( sizeof( struct yy_buffer_state ) );
+ if ( ! b )
+ YY_FATAL_ERROR( "out of dynamic memory in yy_scan_buffer()" );
+
+ b->yy_buf_size = size - 2; /* "- 2" to take care of EOB's */
+ b->yy_buf_pos = b->yy_ch_buf = base;
+ b->yy_is_our_buffer = 0;
+ b->yy_input_file = 0;
+ b->yy_n_chars = b->yy_buf_size;
+ b->yy_is_interactive = 0;
+ b->yy_at_bol = 1;
+ b->yy_fill_buffer = 0;
+ b->yy_buffer_status = YY_BUFFER_NEW;
+
+ yy_switch_to_buffer( b );
+
+ return b;
+ }
+#endif
+
+
+#ifndef YY_NO_SCAN_STRING
+#ifdef YY_USE_PROTOS
+YY_BUFFER_STATE yy_scan_string( yyconst char *yy_str )
+#else
+YY_BUFFER_STATE yy_scan_string( yy_str )
+yyconst char *yy_str;
+#endif
+ {
+ int len;
+ for ( len = 0; yy_str[len]; ++len )
+ ;
+
+ return yy_scan_bytes( yy_str, len );
+ }
+#endif
+
+
+#ifndef YY_NO_SCAN_BYTES
+#ifdef YY_USE_PROTOS
+YY_BUFFER_STATE yy_scan_bytes( yyconst char *bytes, int len )
+#else
+YY_BUFFER_STATE yy_scan_bytes( bytes, len )
+yyconst char *bytes;
+int len;
+#endif
+ {
+ YY_BUFFER_STATE b;
+ char *buf;
+ yy_size_t n;
+ int i;
+
+ /* Get memory for full buffer, including space for trailing EOB's. */
+ n = len + 2;
+ buf = (char *) yy_flex_alloc( n );
+ if ( ! buf )
+ YY_FATAL_ERROR( "out of dynamic memory in yy_scan_bytes()" );
+
+ for ( i = 0; i < len; ++i )
+ buf[i] = bytes[i];
+
+ buf[len] = buf[len+1] = YY_END_OF_BUFFER_CHAR;
+
+ b = yy_scan_buffer( buf, n );
+ if ( ! b )
+ YY_FATAL_ERROR( "bad buffer in yy_scan_bytes()" );
+
+ /* It's okay to grow etc. this buffer, and we should throw it
+ * away when we're done.
+ */
+ b->yy_is_our_buffer = 1;
+
+ return b;
+ }
+#endif
+
+
+#ifndef YY_NO_PUSH_STATE
+#ifdef YY_USE_PROTOS
+static void yy_push_state( int new_state )
+#else
+static void yy_push_state( new_state )
+int new_state;
+#endif
+ {
+ if ( yy_start_stack_ptr >= yy_start_stack_depth )
+ {
+ yy_size_t new_size;
+
+ yy_start_stack_depth += YY_START_STACK_INCR;
+ new_size = yy_start_stack_depth * sizeof( int );
+
+ if ( ! yy_start_stack )
+ yy_start_stack = (int *) yy_flex_alloc( new_size );
+
+ else
+ yy_start_stack = (int *) yy_flex_realloc(
+ (void *) yy_start_stack, new_size );
+
+ if ( ! yy_start_stack )
+ YY_FATAL_ERROR(
+ "out of memory expanding start-condition stack" );
+ }
+
+ yy_start_stack[yy_start_stack_ptr++] = YY_START;
+
+ BEGIN(new_state);
+ }
+#endif
+
+
+#ifndef YY_NO_POP_STATE
+static void yy_pop_state()
+ {
+ if ( --yy_start_stack_ptr < 0 )
+ YY_FATAL_ERROR( "start-condition stack underflow" );
+
+ BEGIN(yy_start_stack[yy_start_stack_ptr]);
+ }
+#endif
+
+
+#ifndef YY_NO_TOP_STATE
+static int yy_top_state()
+ {
+ return yy_start_stack[yy_start_stack_ptr - 1];
+ }
+#endif
+
+#ifndef YY_EXIT_FAILURE
+#define YY_EXIT_FAILURE 2
+#endif
+
+#ifdef YY_USE_PROTOS
+static void yy_fatal_error( yyconst char msg[] )
+#else
+static void yy_fatal_error( msg )
+char msg[];
+#endif
+ {
+ (void) fprintf( stderr, "%s\n", msg );
+ exit( YY_EXIT_FAILURE );
+ }
+
+
+
+/* Redefine yyless() so it works in section 3 code. */
+
+#undef yyless
+#define yyless(n) \
+ do \
+ { \
+ /* Undo effects of setting up yytext. */ \
+ yytext[yyleng] = yy_hold_char; \
+ yy_c_buf_p = yytext + n; \
+ yy_hold_char = *yy_c_buf_p; \
+ *yy_c_buf_p = '\0'; \
+ yyleng = n; \
+ } \
+ while ( 0 )
+
+
+/* Internal utility routines. */
+
+#ifndef yytext_ptr
+#ifdef YY_USE_PROTOS
+static void yy_flex_strncpy( char *s1, yyconst char *s2, int n )
+#else
+static void yy_flex_strncpy( s1, s2, n )
+char *s1;
+yyconst char *s2;
+int n;
+#endif
+ {
+ register int i;
+ for ( i = 0; i < n; ++i )
+ s1[i] = s2[i];
+ }
+#endif
+
+#ifdef YY_NEED_STRLEN
+#ifdef YY_USE_PROTOS
+static int yy_flex_strlen( yyconst char *s )
+#else
+static int yy_flex_strlen( s )
+yyconst char *s;
+#endif
+ {
+ register int n;
+ for ( n = 0; s[n]; ++n )
+ ;
+
+ return n;
+ }
+#endif
+
+
+#ifdef YY_USE_PROTOS
+static void *yy_flex_alloc( yy_size_t size )
+#else
+static void *yy_flex_alloc( size )
+yy_size_t size;
+#endif
+ {
+ return (void *) malloc( size );
+ }
+
+#ifdef YY_USE_PROTOS
+static void *yy_flex_realloc( void *ptr, yy_size_t size )
+#else
+static void *yy_flex_realloc( ptr, size )
+void *ptr;
+yy_size_t size;
+#endif
+ {
+ /* The cast to (char *) in the following accommodates both
+ * implementations that use char* generic pointers, and those
+ * that use void* generic pointers. It works with the latter
+ * because both ANSI C and C++ allow castless assignment from
+ * any pointer type to void*, and deal with argument conversions
+ * as though doing an assignment.
+ */
+ return (void *) realloc( (char *) ptr, size );
+ }
+
+#ifdef YY_USE_PROTOS
+static void yy_flex_free( void *ptr )
+#else
+static void yy_flex_free( ptr )
+void *ptr;
+#endif
+ {
+ free( ptr );
+ }
+
+#if YY_MAIN
+int main()
+ {
+ yylex();
+ return 0;
+ }
+#endif
+#line 284 "lexer.l"
+
+
+const char *const builtinservicehelpstrings[]= {
+ "environment",
+ "parameter <parameter>",
+ "version",
+ "toplevel",
+ "override",
+ "reset",
+ "execute",
+ "help",
+ 0
+};
+
+#include "parser.c"
+
--- /dev/null
+/*
+ * Copyright (C)1996-1997,1999 Ian Jackson
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with userv; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+%{
+
+
+
+
+
+#include <syslog.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <grp.h>
+#include <fnmatch.h>
+#include <limits.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <errno.h>
+
+#include "config.h"
+#include "common.h"
+#include "daemon.h"
+#include "lib.h"
+#include "tokens.h"
+
+#define HYPHEN '-'
+
+typedef int directive_fnt(int dtoken);
+static directive_fnt df_reject, df_execute, df_executefrompath;
+static directive_fnt df_executefromdirectory, df_executebuiltin;
+static directive_fnt df_errorstostderr, df_errorstosyslog, df_errorstofile;
+static directive_fnt dfg_fdwant, dfg_setflag;
+static directive_fnt df_reset, df_cd, df_userrcfile, df_include;
+static directive_fnt df_includelookup, df_includedirectory;
+static directive_fnt df_message, df_error, df_quit, df_eof;
+static directive_fnt df_if, df_catchquit, df_errorspush;
+static directive_fnt dfi_includeuserrcfile, dfi_includeclientconfig;
+/* directive functions return:
+ * 0 for success having scanned up to and including end of line but not beyond,
+ * or tokv_error or tokv_quit.
+ * They expect to parse the whitespace before their parameters (if any).
+ */
+
+typedef int parmcondition_fnt(int ctoken, char *const *parmvalues, int *rtrue);
+static parmcondition_fnt pcf_glob, pcf_range, pcf_grep;
+/* all conditional functions return tokv_error for failure or 0 for success
+ * at parsing and testing, in which case *rtrue is set to 0 or 1.
+ * On success they have scanned up to and including the condition's
+ * terminating newline; the pcf_... functions expect to parse the whitespace
+ * between the parameter name and the condition's arguments.
+ * Otherwise they return tokv_error.
+ * The parameter-based conditionals take a list of parameter values
+ * as obtained from the parameter functions and pa_parameter,
+ * and do _not_ free it.
+ */
+
+typedef int parameter_fnt(int ptoken, char ***rvalues);
+static parameter_fnt pf_service;
+static parameter_fnt pf_callinguser, pf_serviceuser;
+static parameter_fnt pf_callinggroup, pf_servicegroup;
+static parameter_fnt pf_callingusershell, pf_serviceusershell;
+/* Parameter functions return tokv_error or 0 for success at parsing
+ * and determining the value, in which case *rvalues is made to be
+ * a mallocd null-terminated array of pointers to mallocd strings.
+ * freeparm can be used to free such an array.
+ */
+
+typedef int builtinserviceparse_fnt(char ***rnewargs);
+static builtinserviceparse_fnt bispa_none, bispa_parameter;
+/* These parse the arguments to a builtin service, including the
+ * newline at the end of the line. *rnewargs will initially be
+ * null, indicating that no arguments are to be set; the function
+ * may store a mallocd array of mallocd strings in it,
+ * containing the arguments it wishes to have set (null-pointer
+ * terminated).
+ */
+
+static int yylex(void);
+/* Returns a token (which may be an eof or error exception) */
+
+static directive_fnt *lr_dir;
+static parmcondition_fnt *lr_parmcond;
+static builtinserviceparse_fnt *lr_bispa;
+static builtinserviceexec_fnt *lr_bisexec;
+static parameter_fnt *lr_parameter;
+static int lr_loglevel, lr_logfacility, lr_min, lr_max, *lr_flag;
+static int lr_flagval, lr_controlend;
+static int lr_fdwant_readwrite; /* -1=never, 0=opt, 1=always */
+
+/* Forward declarations of things used in lexer and parser */
+
+struct parser_state {
+ int lineno, reportlineno, notedreferer, isinternal;
+ const char *filename;
+ struct stat filestab;
+ YY_BUFFER_STATE ybuf;
+ struct parser_state *upstate;
+};
+
+static struct parser_state *cstate;
+
+struct error_handling {
+ int handling; /* One of the error handling modes tokt_ehandlemode */
+ int logfacility, loglevel;
+ int filekeep; /* File is in use by higher-level errors-push, leave it open */
+ FILE *file;
+ char *filename;
+};
+
+static struct error_handling eh = { tokv_word_errorstostderr, 0,0,0,0,0 };
+
+static int dequote(char *inplace);
+
+#define YY_NO_UNPUT
+
+%}
+
+%option noyywrap
+
+%%
+
+reject { lr_dir= df_reject; return tokv_word_reject; }
+execute-from-directory { lr_dir= df_executefromdirectory; return tokv_word_executefromdirectory; }
+execute-from-path { lr_dir= df_executefrompath; return tokv_word_executefrompath; }
+execute-builtin { lr_dir= df_executebuiltin; return tokv_word_executebuiltin; }
+errors-to-stderr { lr_dir= df_errorstostderr; return tokv_word_errorstostderr; }
+errors-to-syslog { lr_dir= df_errorstosyslog; return tokv_word_errorstosyslog; }
+errors-to-file { lr_dir= df_errorstofile; return tokv_word_errorstofile; }
+require-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=1; return tokv_word_requirefd; }
+allow-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=0; return tokv_word_allowfd; }
+null-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=0; return tokv_word_nullfd; }
+reject-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=-1; return tokv_word_rejectfd; }
+ignore-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=-1; return tokv_word_ignorefd; }
+set-environment { lr_dir= dfg_setflag; lr_flag= &setenvironment; lr_flagval= 1; return tokv_word_setenvironment; }
+no-set-environment { lr_dir= dfg_setflag; lr_flag= &setenvironment; lr_flagval= 0; return tokv_word_nosetenvironment; }
+suppress-args { lr_dir= dfg_setflag; lr_flag= &suppressargs; lr_flagval= 1; return tokv_word_suppressargs; }
+no-suppress-args { lr_dir= dfg_setflag; lr_flag= &suppressargs; lr_flagval= 0; return tokv_word_nosuppressargs; }
+disconnect-hup { lr_dir= dfg_setflag; lr_flag= &disconnecthup; lr_flagval= 1; return tokv_word_disconnecthup; }
+no-disconnect-hup { lr_dir= dfg_setflag; lr_flag= &disconnecthup; lr_flagval= 0; return tokv_word_nodisconnecthup; }
+cd { lr_dir= df_cd; return tokv_word_cd; }
+user-rcfile { lr_dir= df_userrcfile; return tokv_word_userrcfile; }
+include { lr_dir= df_include; return tokv_word_include; }
+include-ifexist { lr_dir= df_include; return tokv_word_includeifexist; }
+include-lookup { lr_dir= df_includelookup; return tokv_word_includelookup; }
+include-lookup-all { lr_dir= df_includelookup; return tokv_word_includelookupall; }
+include-directory { lr_dir= df_includedirectory; return tokv_word_includedirectory; }
+message { lr_dir= df_message; return tokv_word_message; }
+_include-sysconfig { lr_dir= df_include; return tokv_word_includesysconfig; }
+_include-user-rcfile { lr_dir= dfi_includeuserrcfile; return tokv_word_includeuserrcfile; }
+_include-client-config { lr_dir= dfi_includeclientconfig; return tokv_word_includeclientconfig; }
+quit { lr_dir= df_quit; return tokv_word_quit; }
+eof { lr_dir= df_eof; return tokv_word_eof; }
+if { lr_dir= df_if; return tokv_word_if; }
+catch-quit { lr_dir= df_catchquit; return tokv_word_catchquit; }
+errors-push { lr_dir= df_errorspush; return tokv_word_errorspush; }
+elif { lr_controlend= tokv_word_if; return tokv_word_elif; }
+else { lr_controlend= tokv_word_if; return tokv_word_else; }
+fi { lr_controlend= tokv_word_if; return tokv_word_fi; }
+hctac { lr_controlend= tokv_word_catchquit; return tokv_word_hctac; }
+srorre { lr_controlend= tokv_word_errorspush; return tokv_word_srorre; }
+glob { lr_parmcond= pcf_glob; return tokv_word_glob; }
+range { lr_parmcond= pcf_range; return tokv_word_range; }
+grep { lr_parmcond= pcf_grep; return tokv_word_grep; }
+environment { lr_bispa= bispa_none; lr_bisexec= bisexec_environment; return tokv_word_environment; }
+parameter { lr_bispa= bispa_parameter; lr_bisexec= bisexec_parameter; return tokv_word_parameter; }
+version { lr_bispa= bispa_none; lr_bisexec= bisexec_version; return tokv_word_version; }
+toplevel { lr_bispa= bispa_none; lr_bisexec= bisexec_toplevel; return tokv_word_toplevel; }
+override { lr_bispa= bispa_none; lr_bisexec= bisexec_override; return tokv_word_override; }
+reset { lr_bispa= bispa_none; lr_bisexec= bisexec_reset; lr_dir= df_reset; return tokv_word_reset; }
+execute { lr_bispa= bispa_none; lr_bisexec= bisexec_execute; lr_dir= df_execute; return tokv_word_execute; }
+help { lr_bispa= bispa_none; lr_bisexec= bisexec_help; return tokv_word_help; }
+service { lr_parameter= pf_service; return tokv_word_service; }
+calling-user { lr_parameter= pf_callinguser; return tokv_word_callinguser; }
+calling-group { lr_parameter= pf_callinggroup; return tokv_word_callinggroup; }
+calling-user-shell { lr_parameter= pf_callingusershell; return tokv_word_callingusershell; }
+service-user { lr_parameter= pf_serviceuser; return tokv_word_serviceuser; }
+service-group { lr_parameter= pf_servicegroup; return tokv_word_servicegroup; }
+service-user-shell { lr_parameter= pf_serviceusershell; return tokv_word_serviceusershell; }
+debug { lr_loglevel= LOG_DEBUG; return tokv_syslog_debug; }
+info { lr_loglevel= LOG_INFO; return tokv_syslog_info; }
+notice { lr_loglevel= LOG_NOTICE; return tokv_syslog_notice; }
+warn(ing)? { lr_loglevel= LOG_WARNING; return tokv_syslog_warning; }
+err { lr_loglevel= LOG_ERR; return tokv_syslog_err; }
+crit { lr_loglevel= LOG_CRIT; return tokv_syslog_crit; }
+alert { lr_loglevel= LOG_ALERT; return tokv_syslog_alert; }
+emerg|panic { lr_loglevel= LOG_EMERG; return tokv_syslog_emerg; }
+auth(priv)?|security { lr_logfacility= LOG_AUTHPRIV; return tokv_syslog_authpriv; }
+cron { lr_logfacility= LOG_CRON; return tokv_syslog_cron; }
+daemon { lr_logfacility= LOG_DAEMON; return tokv_syslog_daemon; }
+kern(el)? { lr_logfacility= LOG_KERN; return tokv_syslog_kern; }
+lpr { lr_logfacility= LOG_LPR; return tokv_syslog_lpr; }
+mail { lr_logfacility= LOG_MAIL; return tokv_syslog_mail; }
+news { lr_logfacility= LOG_NEWS; return tokv_syslog_news; }
+syslog { lr_logfacility= LOG_SYSLOG; return tokv_syslog_syslog; }
+user { lr_logfacility= LOG_USER; return tokv_syslog_user; }
+uucp { lr_logfacility= LOG_UUCP; return tokv_syslog_uucp; }
+local0 { lr_logfacility= LOG_LOCAL0; return tokv_syslog_local0; }
+local1 { lr_logfacility= LOG_LOCAL1; return tokv_syslog_local1; }
+local2 { lr_logfacility= LOG_LOCAL2; return tokv_syslog_local2; }
+local3 { lr_logfacility= LOG_LOCAL3; return tokv_syslog_local3; }
+local4 { lr_logfacility= LOG_LOCAL4; return tokv_syslog_local4; }
+local5 { lr_logfacility= LOG_LOCAL5; return tokv_syslog_local5; }
+local6 { lr_logfacility= LOG_LOCAL6; return tokv_syslog_local6; }
+local7 { lr_logfacility= LOG_LOCAL7; return tokv_syslog_local7; }
+read { return tokv_word_read; }
+write { return tokv_word_write; }
+\$ { return tokv_dollar; }
+\( { return tokv_openparen; }
+\) { return tokv_closeparen; }
+\! { return tokv_not; }
+\& { return tokv_and; }
+\| { return tokv_or; }
+error { lr_dir= df_error; lr_loglevel= LOG_ERR; return tokv_word_error; }
+
+
+
+[0-9]{1,8} {
+ char *ep;
+ lr_min=lr_max= (int)strtoul(yytext,&ep,10);
+ assert(!*ep);
+ return tokv_ordinal;
+ }
+[0-9]{1,8}-[0-9]{1,8} {
+ char *ep;
+ lr_min= (int)strtoul(yytext,&ep,10);
+ assert(*ep == HYPHEN);
+ assert(*++ep);
+ lr_max= (int)strtoul(ep,&ep,10);
+ assert(!*ep);
+ if (lr_max < lr_min) {
+ parseerrprint("fd range has min > max");
+ return tokv_error;
+ }
+ return tokv_fdrange;
+ }
+[0-9]{1,8}- {
+ char *ep;
+ lr_min= (int)strtoul(yytext,&ep,10);
+ assert(*ep == HYPHEN);
+ assert(!*++ep);
+ lr_max=-1;
+ return tokv_fdstoend;
+ }
+[\ \t]+ return tokv_lwsp;
+[\ \t]*\n cstate->lineno++; return tokv_newline;
+[\ \t]*\#[^\n]*\n cstate->lineno++; return tokv_newline;
+[\ \t]*\#[^\n]* {
+ parseerrprint("missing newline at eof after comment");
+ return tokv_error;
+ }
+\"([^\\\"\n]|\\[a-z]|\\[0-9]{3}|\\x[0-9A-Fa-f]{2}|\\[[:punct:]]|\\[ \t]*\n)*\" {
+ return dequote(yytext);
+ }
+\".* {
+ parseerrprint("misquoted or unterminated string");
+ return tokv_error;
+ }
+[^\ \t\n]+ return tokv_barestring;
+<<EOF>> return tokv_eof;
+
+
+%%
+
+const char *const builtinservicehelpstrings[]= {
+ "environment",
+ "parameter <parameter>",
+ "version",
+ "toplevel",
+ "override",
+ "reset",
+ "execute",
+ "help",
+ 0
+};
+
+#include "parser.c"
+
--- /dev/null
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+%%CreationDate: Sun Apr 18 18:52:55 1999
+%%For: ian@anarres (Ian Jackson)
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+gs 1 -1 sc (trusted) col-1 sh gr
+/Times-Italic ff 240.00 scf sf
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+gs 1 -1 sc (socket) col-1 sh gr
+/Times-Italic ff 240.00 scf sf
+750 4275 m
+gs 1 -1 sc (or passed from caller) col-1 sh gr
+/Times-Italic ff 240.00 scf sf
+825 3825 m
+gs 1 -1 sc (fds) col-1 sh gr
+/Times-Italic ff 240.00 scf sf
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+gs 1 -1 sc (opened by client) col-1 sh gr
+/Helvetica ff 225.00 scf sf
+5700 1950 m
+gs 1 -1 sc (service user's security boundary) col-1 sh gr
+$F2psEnd
+rs
+showpage
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - Client program usage
+</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 2<br>
+Client program usage
+
+</h1>
+<pre>userv <var>options</var> [--] <var>service-user</var> <var>service-name</var> [<var>argument</var> ...]
+userv <var>options</var> -B|--builtin [--] <var>builtin-service</var> [<var>info-argument</var> ...]</pre><P>
+
+<var>service-user</var> specifies which user is to provide the service.
+The user may be a login name or a numeric uid, or <code>-</code> to indicate
+that the service user is to be the same as the calling user.<P>
+
+The service name is interpreted by the userv<A href="footnotes.html#1" name="fr1">[1]</A>
+daemon on behalf of the service user. It will often be the name of a
+program.
+<hr>
+<h2><A name="s2.1">
+2.1 Options
+</A></h2>
+
+Single-letter options may be combined as is usual with Unix programs,
+and the value for such an option may appear in the same argument or in
+the next.
+
+<dl>
+<dt><code>-B</code><dt><code>--builtin</code><dd>Requests that a builtin service be provided. This is equivalent to
+using the <kbd>--override</kbd> option to specify a string consisting of
+<kbd>execute-builtin</kbd> followed by the <var>builtin-service</var>
+requested, and requesting a service user of <code>-</code> (indicating the
+calling user).<P>
+
+If the builtin service being requested requires a
+<var>service-argument</var> then this must be supplied to the client in the
+same argument as the <var>builtin-service</var>. See <A href="ch-config.html#s-dirs-execution">Directives for changing execution settings, subsection 4.2.4</A> for details of the builtin services available,
+and <A href="#s-optoverride">Security-overriding options, section 2.2</A> for details of the <kbd>--override</kbd>
+options.<P>
+
+The actual service name passed will be the <var>builtin-service</var>; note
+that this actual service name (as opposed to the override data) and
+the <var>info-argument</var>s supplied will be ignored by most builtin
+services; the override mechanism and <kbd>execute-builtin</kbd> will be
+used to ensure that the right builtin service is called with the right
+<var>service-argument</var>s.
+<p><dt><code>-f</code><var>fd</var><code>[</code><var>modifiers</var><code>]=</code><var>filename</var><code></code><dt><code>--file </code><var>fd</var><code>[</code><var>modifiers</var><code>]=</code><var>filename</var><code></code><dd>Requests that data be copied in and out of the service using pipes.
+For each file or descriptor this will be done by creating a pipe, one
+end of which is passed to the service program and the other end of
+which is passed to a copy of <kbd>cat</kbd> invoked by the client; the
+other file descriptor passed to <kbd>cat</kbd> will be one inherited by
+the client program from the caller or one opened by the client program
+on behalf of the caller.<P>
+
+The descriptor in the service program that should be connected must be
+specified as <var>fd</var>, either as a decimal number or as one of the
+strings <code>stdin</code>, <code>stdout</code> or <code>stderr</code>. The next argument is
+a filename which will be opened by the client with the privileges of
+the calling user.
+<P>
+<var>modifiers</var> is used to specify whether the file or descriptor is
+to be read from or written to. It consists of a series of words
+separated by commas. A comma may separate the <var>modifiers</var> from
+the <var>fd</var> and is required if <var>fd</var> is not numeric.
+<P>
+The modifier words are:
+<dl compact>
+<dt><code>read</code><dd><code>O_RDONLY</code>: Allow reading and not writing. May not be used with
+<code>write</code> or things that imply it.
+<dt><code>write</code><dd><code>O_WRONLY</code>: Allow writing and not reading. <em>Doesn't truncate or
+create</em> without <code>truncate</code> or <code>create</code>. <code>write</code> or things
+that imply it may not be used with <code>read</code>.
+<dt><code>overwrite</code><dd>Equivalent to <code>write,create,truncate</code>.
+<dt><code>create</code><dt><code>creat</code><dd><code>O_CREAT</code>: Creates the file if necessary. Implies <code>write</code>.
+<dt><code>exclusive</code><dt><code>excl</code><dd><code>O_EXCL</code>: Fails if the file already exists. Implies <code>write</code> and
+<code>create</code>. May not be used with <code>truncate</code>.
+<dt><code>truncate</code><dt><code>trunc</code><dd><code>O_TRUNC</code>: Truncate any existing file. Implies <code>write</code>.
+May not be used with <code>exclusive</code>.
+<dt><code>append</code><dd><code>O_APPEND</code>: All writes will append to the file. Implies <code>write</code>
+(but not <code>create</code>).
+<dt><code>sync</code><dd><code>O_SYNC</code>: Do writes synchronously. Implies <code>write</code>.
+<dt><code>wait</code><dt><code>nowait</code><dt><code>close</code><dd>These modifiers control the behaviour of the client, with respect to
+the pipes carrying data to and from the service, when the service
+terminates. See below.
+<dt><code>fd</code><dd>The <var>filename</var> is not a filename but a numeric file descriptor.
+One or both of <code>read</code> and <code>write</code> must be specified, and no
+other words are allowed. The <var>filename</var> may also be <code>stdin</code>,
+<code>stdout</code> or <code>stderr</code> for file descriptor 0, 1 or 2 respectively.
+</dl>
+<P>
+
+If no <var>modifiers</var> which imply <code>read</code> or <code>write</code> are used it
+is as if <code>write</code> had been specified, except that if the
+filedescriptor 0 of the service is being opened (either specified
+numerically or with <code>stdin</code>) it is as if <code>overwrite</code> had been
+specified (or <code>write</code> if only <code>fd</code> was specified).<P>
+
+The client will also use <code>O_NOCTTY</code> when opening files specified by
+the caller, to avoid changing its controlling terminal.<P>
+
+By default stdin, stdout and stderr of the service will be connected
+to the corresponding descriptors on the client. Diagnostics from
+the client and daemon will also appear on stderr.<P>
+
+If <code>wait</code> is specified, the client will wait for the pipe to be
+closed, and only exit after this has happened. This means that either
+the receiving end of the pipe connection was closed while data was
+still available at the sending end, or that the end of file was
+reached on the reading file descriptor. Errors encountered reading or
+writing in the client at this stage will be considered a system error
+and cause the client to exit with status 255, but will not cause
+disconnection at the service side since the service has already
+exited.<P>
+
+If <code>close</code> is specified the client will immediately close the pipe
+connection by killing the relevant copy of <kbd>cat</kbd>. If the service
+uses the descriptor it will get <kbd>SIGPIPE</kbd> (or <kbd>EPIPE</kbd>) for a
+writing descriptor or end of file for a reading one; the descriptor
+opened by or passed to the client will also be closed.<P>
+
+If <code>nowait</code> is specified then the client will not wait and the
+connection will remain open after the client terminates. Data may
+continue to be passed between the inheritors of the relevant
+descriptor on the service side and the corresponding file or
+descriptor on the client side until either side closes their
+descriptor. This should not usually be specified for stderr (or
+stdout if <code>--signals stdout</code> is used) since diagnostics from
+the service side may arrive after the client has exited and be
+confused with expected output.<P>
+
+The default is <code>wait</code> for writing file descriptors and <code>close</code>
+for reading ones.
+<dt><code>-w</code><var>fd</var><code>=</code><var>action</var><code></code><dt><code>--fdwait</code><var>fd</var><code>=</code><var>action</var><code></code><dd>Sets the action on termination of the service for the specified file
+descriptor; <var>action</var> must be <code>wait</code>, <code>nowait</code> or <code>close</code>
+as described above. The file descriptor must be specified as open
+when this option is encountered; this option is overridden by any
+later <kbd>--file</kbd> or <kbd>--fdwait</kbd> option - even by a
+<kbd>--file</kbd> which does not specify an action on termination (in this
+case the default will be used, as described above).
+<dt><code>-D</code><var>name</var><code>=</code><var>value</var><code></code><dt><code>--defvar </code><var>name</var><code>=</code><var>value</var><code></code><dd>Set a user-defined variable <var>name</var> to <var>value</var>. These
+user-defined variables are made available in the configuration
+language as the parameters <code>u-</code><var>name</var><code></code> and are passed to the
+service in environment variables <code>USERV_U_</code><var>name</var><code></code>. <var>name</var>
+may contain only alphanumerics and underscores, and must start with a
+letter. If several definitions are given for the same <var>name</var> then
+only the last is effective.
+<dt><code>-t </code><var>seconds</var><code></code><dt><code>--timeout </code><var>seconds</var><code></code><dd>Time out the service if it takes longer than <var>seconds</var> seconds (a
+positive integer, in decimal). Timeout will produce a diagnostic on
+stderr and an exit status of 255. If <var>seconds</var> is zero then no
+timeout will be implemented (this is the default).
+<dt><code>-S</code> <var>method</var><dt><code>--signals</code> <var>method</var><dd>Affects the handling of the exit status when the service terminates
+due to a signal. (The client will always finish by calling
+<kbd>_exit</kbd>, so that only numbers from 0 to 255 can be returned and
+not the full range of numbers and signal indications which can be
+returned by the <kbd>wait</kbd> family of system calls.)<P>
+
+The <var>method</var> may be one of the following:
+<dl compact>
+<dt><var>status</var><dd>The client's exit status will be <var>status</var>. This will not be
+distinguishable from the service really having exited with code
+<var>status</var>. This method is the default, with a <var>status</var> of 254.
+<dt><code>number</code><dt><code>number-nocore</code><dd>The client's exit status will be the number of the signal which caused
+the termination of the service. If <code>number</code> is used rather than
+<code>number-nocore</code> then 128 will be added if the service dumped core.
+<code>number</code> is very like the exit code mangling done by the Bourne
+shell.
+<dt><code>highbit</code><dd>The client's exit status will be the number of the signal with
+128 added. If the service exits normally with an exit code of greater
+than 127 then 127 will be returned.
+<dt><code>stdout</code><dd>The service's numeric wait status as two decimal numbers (high byte
+first) and a textual description of its meaning will be printed to the
+client's standard output. It will be preceded by a newline and
+followed by an extra newline, and the numbers are separated from each
+other and from the textual description by single spaces. The exit
+status of the client will be zero, unless a system error occurs in
+which case no exit status and description will be printed to stdout,
+and an error message will be printed to stderr as usual.</dl>
+
+<P>
+Problems such as client usage errors, the service not being found or
+permission being denied or failure of a system call are system errors.
+An error message describing the problem will be printed on the
+client's stderr, and the client's exit status will be 255. If the
+client dies due to a signal this should be treated as a serious system
+error.
+<dt><code>-H</code><dt><code>--hidecwd</code><dd>Prevents the calling process's current directory name from being
+passed to the service; the null string will be passed instead.
+<dt><code>-P</code><dt><code>--sigpipe</code><dd>If the service program is terminated due to a <kbd>SIGPIPE</kbd> the exit
+status of the client will be zero, even if it would have been
+something else according to the exit status method specified. This
+option has no effect on the code and description printed if the exit
+status method <code>stdout</code> is in use.
+<dt><code>-h</code><dt><code>--help</code><dt><code>--copyright</code><dd><code>-h</code> or <code>--help</code> prints the client's usage message;
+<code>--copyright</code> prints the copyright and lack of warranty notice.
+</dl>
+
+<hr>
+<h2><A name="s-optoverride">
+2.2 Security-overriding options
+</A></h2>
+
+There are also some options which are available for debugging and to
+allow the system administrator to override a user's policy. These
+options are available only if the client is called by root or if the
+calling user is the same as the service user.
+
+<dl>
+<dt><code>--override </code><var>configuration-data</var><code></code><dt><code>--override-file </code><var>filename</var><code></code><dd>Do not read the usual configuration files. Instead, the client sends
+<var>configuration-data</var> (followed by a newline) or the contents of
+<var>filename</var> (which is opened in the context of the client) to the
+daemon and the daemon uses that data instead. The
+<var>configuration-data</var> must all be in one argument. It will have a
+single newline appended so that a single directive can easily be
+given, but if more than one directive is required it will have to
+contain one or more real newlines.
+<p><dt><code>--spoof-user </code><var>user</var><code></code><dd>Pretend to the service that it is being called by <var>user</var> (which
+may be a username or a uid). This will also affect the group and
+supplementary groups supplied to the service; they will be the
+standard group and supplementary groups for <var>user</var>. The
+<code>--spoof-user</code> option will <em>not</em> affect which user is chosen if
+the service user is specified as just <code>-</code>; in this case the service
+user will be the real calling user.
+<p></dl>
+
+
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-envir.html">next</A>; <A href="ch-intro.html">back</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - Service-side configuration</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 4<br>
+Service-side configuration
+</h1>
+
+Which services may be run by whom and under what conditions is
+controlled by configuration files.<P>
+
+The daemon will read these files in order. Certain directives in the
+files modify the daemon's execution settings for invoking the service,
+for example allowing certain file descriptors to be specified by the
+client or specifying which program to execute to provide the service.<P>
+
+The <em>last</em> instance of each such setting will take effect. The
+directives which specify which program to execute will not stop the
+configuration file from being read; they will be remembered and will
+only take effect if they are not overridden by a later directive.<P>
+
+The daemon will first read <code>/etc/userv/system.default</code>. Then, by
+default (this behaviour may be modified), it will read a per-user file
+<code>~/.userv/rc</code>, if it exists and the service user's shell is in
+<code>/etc/shells</code>. Finally it will read
+<code>/etc/userv/system.override</code>.<P>
+
+When it has read all of these files it will act according to the
+currently values of of the execution settings.
+<hr>
+<h2><A name="s4.1">
+4.1 Configuration file syntax
+</A></h2>
+
+The configuration file is a series of directives, usually one per
+line. The portion of a line following a hash character <code>#</code> is
+taken as a comment and ignored. Each directive consists of a series
+of tokens separated by linear whitespace (spaces and tabs); tokens may
+be words consisting of non-space characters, or, where a string is
+required, a string in double quotes. Double-quoted strings may
+contain the following backslash escapes:
+
+<dl compact>
+<dt><code>\n</code><dd>newline<dt><code>\t</code><dd>tab<dt><code>\r</code><dd>carriage return<dt><code>\</code><var>OOO</var><code></code><dd>character whose octal code is <var>OOO</var><dt><code>\x</code><var>XX</var><code></code><dd>character whose hex code is <var>XX</var><dt><code>\</code><var>punctuation</var><code></code><dd>literal punctuation character (eg <code>\\</code>, <code>\"</code>)<dt><code>\</code><var>newline</var><code></code> (ie, backslash at end of line)<dd>string continues on next line</dl>
+<P>
+
+Relative pathnames in directives are relative to the service program's
+current directory (usually the service user's home directory).
+Pathnames starting with the two characters <code>~/</code> are taken to be
+relative to the service user's home directory.
+<hr>
+<h2><A name="s-directives">
+4.2 Configuration file directives
+</A></h2>
+<hr>
+<h3><A name="s-dirs-immediate">
+4.2.1 Immediate directives
+</A></h3>
+
+The following directives take effect immediately:
+
+<dl>
+<dt><code>cd </code><var>pathname</var><code></code><dd>Change directory in the service program. <kbd>cd</kbd> is cumulative. It
+is an error if the directory cannot be changed to.<P>
+
+<kbd>cd</kbd> should not be used between <kbd>execute-from-directory</kbd> and
+the invocation of the service program, as the test for the
+availability of the service program would be done with the old current
+directory and the actual execution with the new (probably causing an
+error).
+<p><dt><code>eof</code><dd>Stop reading the configuration file in question, as if end of file had
+been reached. Any control constructs (<kbd>if</kbd>, <kbd>catch-quit</kbd> or
+<kbd>errors-push</kbd>) which were started in that file will be considered
+finished. Parsing will continue in the file which caused the file
+containing the <kbd>eof</kbd> to be read.
+<p><dt><code>quit</code><dd>Stop reading configuration files and act immediately on the current
+settings. The behaviour of <kbd>quit</kbd> is subject to the
+<kbd>catch-quit</kbd> control construct.
+<p><dt><code>include </code><var>filename</var><code></code><dt><code>include-ifexist </code><var>filename</var><code></code><dd>Read the configuration file <var>filename</var>, and then return to this
+file and continue parsing it with the next directive. It is an error
+if the file cannot be opened and read, unless <kbd>include-ifexist</kbd>
+is used and the file does not exist, in which case the directive is
+silently ignored.
+<p><dt><code>include-lookup </code><var>parameter</var><code> </code><var>directory</var><code></code><dt><code>include-lookup-all </code><var>parameter</var><code> </code><var>directory</var><code></code><dd>Read the configuration file in <var>directory</var> whose name is the value
+of <var>parameter</var> (see the description of <kbd>if</kbd>, <A href="#s-dirs-control">Control structure directives, subsection 4.2.3</A>). If <var>parameter</var> has several values they will
+be tried in order; with <kbd>include-lookup</kbd> this search will stop
+when one is found, but with <kbd>include-lookup-all</kbd> the search will
+continue and any files appropriate to other values will be read too.<P>
+
+If none of the parameter's values had a corresponding file then the
+file <code>:default</code> will be read, if it exists. If <var>parameter</var>'s
+list of values was empty then the file <code>:none</code> will be tried first
+and read if it exists, otherwise <code>:default</code> will be tried.<P>
+
+It is not an error for any of the files (including <code>:default</code>) not
+to exist, but it is an error if a file exists and cannot be read or if
+the directory cannot be accessed.
+<P>
+A translation will be applied to values before they are used to
+construct a filename, so that the lookup cannot access dotfiles or
+files in other directories: values starting with full stops will have
+a colon prepended (making <code>:.</code>), colons will be doubled, and each
+slash will be replaced with a colon followed by a hyphen <code>:-</code>. A
+parameter value which is the empty string will be replaced with
+<code>:empty</code> (note that this is different from a parameter not having
+any values).
+<p><dt><code>include-directory </code><var>directory</var><code></code><dd>Read configuration from all files in directory <var>directory</var> which
+are plain files whose names consist only of alphanumerics and hyphens
+and start with an alphanumeric. They will be read in lexical order.
+It is an error for the directory not to exist or for it or any of the
+files found not to be read successfully, or for anything with an
+appropriate name not to be a plain file or a symbolic link to a plain
+file.
+<p><dt><code>error </code><var>text ...</var><code></code><dd>Causes an error whose message includes the descriptive string
+<var>text</var>. <var>text</var> may consist of several tokens with intervening
+whitespace. The whitespace will be included in the message as found
+in the configuration file: all the characters until the end of the
+line will be included verbatim, unless they are part of a
+double-quoted string, in which case the usual meaning of the string
+(i.e., after backslash escape processing) will be used. Comments and
+linear whitespace at the end of the line (or just before the comment)
+will still be ignored.
+<p><dt><code>message </code><var>text ...</var><code></code><dd>Causes a message including the descriptive string <var>text</var> to be
+delivered as if it were an error message, but does not actually cause
+an error.<p></dl>
+
+<hr>
+<h3><A name="s-dirs-delayed">
+4.2.2 Directives with delayed effect
+</A></h3>
+
+The following directives have no immediate effect, but are remembered
+and have an effect on later processing of the configuration files.
+
+<dl>
+<dt><code>user-rcfile </code><var>filename</var><code></code><dd>Specifies that the file <var>filename</var> should be read instead of the
+user's <code>~/.userv/rc</code>. This does <em>not</em> happen immediately;
+instead, the setting is remembered and used after the
+<kbd>system.default</kbd> configuration file has been read. This
+directive has no effect in a user's configuration file or in the
+<kbd>system.override</kbd> file, as the user's configuration file has
+already been found and read by then and will not be re-read.
+<p><dt><code>errors-to-stderr</code><dd>Causes error messages to be delivered to the client's stderr.
+<p><dt><code>errors-to-file</code> <var>filename</var><dd>Error messages will be written to <var>filename</var>, which will be opened
+in the context of and with the privileges of the service user.
+<p><dt><code>errors-to-syslog</code> [<var>facility</var> [<var>level</var>]]<dd>Error messages will be delivered using <kbd>syslog</kbd>. The default
+<var>facility</var> is <code>user</code>; the default <var>level</var> is <code>error</code>.<p></dl>
+
+<hr>
+<h3><A name="s-dirs-control">
+4.2.3 Control structure directives
+</A></h3>
+
+The following directives are used to create control structures. If
+the end of the file is encountered before the end of any control
+structure which was started inside it then that control structure is
+considered finished. This is not an error.
+
+<dl>
+<dt><code>if </code><var>condition</var><code></code><dt><code>elif </code><var>condition</var><code></code><dt><code>else</code><dt><code>fi</code><dd>Lines following <kbd>if</kbd> are interpreted only if the condition is
+true. Many conditions are properties of parameter values. Most
+parameters have a single string as a value; however, some may yield
+zero or several strings, in which case the condition is true if it is
+true of any of the strings individually. Parameters are described
+below.<P>
+
+The conditions are:
+
+<dl compact>
+<dt><code>glob </code><var>parameter</var><code> </code><var>glob-pattern</var><code> ...</code><dd>The value of the parameter whose name is given matches one of the glob
+patterns (anchored at both ends; backslashes can be used to escape
+metacharacters).
+<dt><code>range </code><var>parameter</var><code> </code><var>min</var><code> </code><var>max</var><code></code><dd>The value of the parameter is a nonnegative integer and lies within
+the range specified. <var>min</var> or <var>max</var> may be <code>$</code> to indicate
+no lower or upper limit, respectively.
+<dt><code>grep </code><var>parameter</var><code> </code><var>filename</var><code></code><dd>The <var>filename</var> refers to a file one of whose lines is the value of
+the parameter (leading or trailing whitespace on each line and empty
+lines in the file are ignored). It is an error for the file not to be
+opened and read.
+<dt><code>! </code><var>condition</var><code></code><dd>The <var>condition</var> is <em>not</em> true.
+<dt>Conjunctions: <code>&</code> and <code>|</code><dd><pre>( <var>condition</var>
+& <var>condition</var>
+& <var>condition</var>
+...
+)</pre>
+is true if all the listed conditions are true; where <code>|</code> is used it
+is true if any of them is true. Newlines must be used to separate one
+condition from the next, as shown, and the parentheses are mandatory.
+These conjunctions do not do lazy evaluation.</dl>
+<P>
+
+The parameters are:
+
+<dl compact>
+<dt><code>service</code><dd>The service name specified when the client was called.
+<dt><code>calling-user</code><dd>Two strings: the login name of the calling user (determined as for
+<kbd>USERV_USER</kbd>, above) and the calling uid (represented in
+decimal).
+<dt><code>calling-group</code><dd>Several strings: the primary and supplementary group names and gids
+(in decimal) of the calling process. All the group names come first,
+and then the gids. If the first supplementary group is the same as
+the primary group then it is elided.
+<dt><code>calling-user-shell</code><dd>The calling user's shell, as listed in the password entry for the
+calling login name (as determined for <kbd>USERV_USER</kbd>, above).
+<dt><code>service-user</code><dd>Two strings: the name of the service user (as specified to the client)
+and their uid (represented in decimal).
+<dt><code>service-group</code><dd>Several strings: the primary and supplementary group names and gids
+(in decimal) of the service user.
+<dt><code>service-user-shell</code><dd>The service user's shell, as listed in their password entry.
+<dt><code>u-</code><var>name</var><code></code><dd>The value of the user-defined variable <var>name</var> passed by the caller
+using the <kbd>--defvar</kbd> command-line option to the client. If the
+variable was not defined then this parameter is an empty list of
+strings; in this case any condition which tests it will be false, and
+<code>include-lookup</code> on it will read the <code>:none</code> file, or
+<code>:default</code> if <code>:none</code> is not found.
+</dl>
+
+<dt><code>errors-push</code> <var>filename</var><dt><code>srorre</code><dd>Stacks the error handling behaviour currently in effect. Any changes
+to error handling will take effect only between <kbd>errors-push</kbd> and
+<kbd>srorre</kbd>.
+<dt><code>catch-quit</code><dt><code>hctac</code><dd>Any use of <kbd>quit</kbd> inside <kbd>catch-quit</kbd> will merely cause the
+parsing to continue at <kbd>hctac</kbd> instead. Any control constructs
+started since the <kbd>catch-quit</kbd> will be considered finished if a
+<kbd>quit</kbd> is found.<P>
+
+If an error occurs inside <kbd>catch-quit</kbd> the execution settings
+will be reset (as if by the <kbd>reset</kbd> directive) and parsing will
+likewise continue at <kbd>hctac</kbd>.<P>
+
+If a lexical or syntax error is detected in the same configuration
+file as the <kbd>catch-quit</kbd>, while looking for the <kbd>hctac</kbd>
+after an error or <kbd>quit</kbd>, that new error will not be caught.
+</dl>
+
+<hr>
+<h3><A name="s-dirs-execution">
+4.2.4 Directives for changing execution settings
+</A></h3>
+
+The following directives modify the execution settings; the server
+will remember the fact that the directive was encountered and act on
+it only after all the configuration has been parsed. The <em>last</em>
+directive which modifies any particuar setting will take effect.
+
+<dl>
+<dt><code>reject</code><dd>Reject the request. <kbd>execute</kbd>, <kbd>execute-from-directory</kbd> and
+<kbd>execute-from-path</kbd> will change this setting.
+<p><dt><code>execute </code><var>program</var><code> [</code><var>argument</var><code> ...]</code><dd>Execute the program <var>program</var>, with the arguments as specified,
+followed by any arguments given to the client if
+<kbd>no-suppress-args</kbd> is in effect. It is an error for the
+execution to fail when it is attempted (after all the configuration
+has been parsed). If <var>program</var> does not contain a slash it will
+be searched for on the service user's path.
+<p><dt><code>execute-from-directory </code><var>pathname</var><code> [</code><var>argument</var><code> ...]</code><dd>Take all the characters after the last slash of the service name
+specified when the client was called, and execute that program in the
+directory named by <var>pathname</var> as if it had been specified for
+<var>execute</var>. The part of the service name used may contain only
+alphanumerics and hyphens and must start with an alphanumeric (and it
+must be non-empty), otherwise it is an error.<P>
+
+This directive is ignored if the relevant program does not exist in
+the directory specified; in this case the program to execute is left
+at its previous setting (or unset, if it was not set before).<P>
+
+It is an error for the test for the existence of the program to fail
+other than with a `no such file or directory' indication. It is also
+an error for the execution to fail if and when it is attempted (after
+all the configuration has been parsed).
+<p><dt><code>execute-from-path</code><dd><var>service</var> is interpreted as a program on the default <kbd>PATH</kbd>
+(or as a pathname of an executable, if it contains a <code>/</code>). This
+directive is <em>very dangerous</em>, and is only provided to make the
+<kbd>--override</kbd> options effective. It should not normally be used.
+It is an error for the execution to fail when it is attempted (after
+all the configuration has been parsed).
+<p><dt><code>execute-builtin </code><var>service-name</var><code> </code><var>service-arguments</var><code></code><dd>Executes the builtin service <var>service-name</var>. These builtin
+services display information about the server and/or the request, and
+ignore any arguments passed from the service side except possibly to
+print them as part of their output. They write their results to their
+standard output (i.e., wherever file descriptor 1 is directed). The
+builtin services are:
+
+<dl compact>
+<dt><code>execute</code><dd>Displays the execution settings, defined variables,
+arguments, etc. with which the builtin service was invoked.
+<dt><code>environment</code><dd>Displays the environment variable settings with which the builtin
+service was invoked.
+<dt><code>parameter </code><var>parameter</var><code></code><dd>Displays the values of the service configuration language parameter
+specified.
+<dt><code>version</code><dd>Displays the version string and compilation details of the uservd
+server program.
+<dt><code>reset</code><dd>Displays the default reset configuration (evaluated when <kbd>reset</kbd>
+is found in a configuration file, or when an error is caught by
+<kbd>catch-quit</kbd>).
+<dt><code>toplevel</code><dd>Displays the top-level default configuration (the configuration data,
+evaluated by the server, which calls all the other configuration
+files).
+<dt><code>override</code><dd>Displays the top-level override configuration (the configuration data,
+evaluated by the server, which causes all the other configuration data
+to be parsed).
+<dt><code>help</code><dd>Displays a list of the understood builtin service names and arguments.</dl>
+
+
+In the future other builtin services may be defined which do more than
+just print information.
+<dt><code>set-environment</code><dt><code>no-set-environment</code><dd>Runs <code>/etc/environment</code> to set the service user's environment.
+This adds the overhead of invoking a shell, but doesn't cause any
+shell (de)mangling of the service's arguments. This is achieved by
+invoking
+<pre>.../program arg arg arg ...</pre>
+as
+<pre>/bin/sh -c '. /etc/environment; exec "$@"' - .../program arg arg arg ...</pre>
+<kbd>no-set-environment</kbd> cancels the effect of
+<kbd>set-environment</kbd>.
+<dt><code>no-suppress-args</code><dt><code>suppress-args</code><dd>Include any arguments given to the client as arguments to the program
+invoked as a result of an <kbd>execute</kbd>,
+<kbd>execute-from-directory</kbd> or <kbd>execute-from-path</kbd> directive.
+<kbd>suppress-args</kbd> undoes the effect of <kbd>no-suppress-args</kbd>.
+<dt><code>require-fd </code><var>fd-range</var><code> read|write</code><dd>Insist that the filedescriptor(s) be opened for reading resp. writing.
+It is an error if any descriptor marked as required when the service
+is about to be invoked (after the configuration has been parsed) was
+not specified when the client was invoked. Each file descriptor has a
+separate setting, and the last one of <kbd>require-fd</kbd>,
+<kbd>allow-fd</kbd>, <kbd>ignore-fd</kbd>, <kbd>null-fd</kbd> or <kbd>reject-fd</kbd>
+which affected a particular file descriptor will take effect.<P>
+
+<var>fd-range</var> may be a single number, two numbers separated by a
+hyphen, or one number followed by a hyphen (indicating all descriptors
+from that number onwards). It may also be one of the words
+<code>stdin</code>, <code>stdout</code> or <code>stderr</code>. Open-ended file descriptor
+rangers are allowed only with <kbd>reject-fd</kbd> and <kbd>ignore-fd</kbd>,
+as otherwise the service program would find itself with a very large
+number of file descriptors open.<P>
+
+When the configuration has been parsed, and before the service is
+about to be executed, stderr (fd 2) must be required or allowed
+(<kbd>require-fd</kbd> or <kbd>allow-fd</kbd>) for writing; this is so that
+the error message printed by the server's child process if it cannot
+<kbd>exec</kbd> the service program is not lost.
+<dt><code>allow-fd </code><var>fd-range</var><code> [read|write]</code><dd>Allow the descriptor(s) to be opened for reading resp. writing, or
+either if neither <code>read</code> nor <code>write</code> is specified. If a
+particular descriptor not specified by the client then it will be open
+onto <code>/dev/null</code> (for reading, writing, or both, depending on
+whether <code>read</code>, <code>write</code> or neither was specified).
+<dt><code>null-fd </code><var>fd-range</var><code> [read|write]</code><dd>Specify that the descriptor(s) be opened onto <kbd>/dev/null</kbd> for
+reading resp. writing, or both if neither <code>read</code> nor <code>write</code>
+is specified. Any specification of these file descriptors by the
+client will be silently ignored; the client will see its ends of the
+descriptors being closed immediately.
+<dt><code>reject-fd </code><var>fd-range</var><code></code><dd>Do not allow the descriptor(s) to be specified by the client. It is
+an error if any descriptor(s) marked for rejection are specified when
+the service is about to be invoked (after the configuration has been
+parsed).
+<dt><code>ignore-fd </code><var>fd-range</var><code></code><dd>Silently ignore any specification by the client of those
+descriptor(s). The pipes corresponding to these descriptors will be
+closed just before the service is invoked.
+<dt><code>disconnect-hup</code><dt><code>no-disconnect-hup</code><dd>Causes the service's process group to get a <kbd>SIGHUP</kbd> if the
+client disconnects before the main service process terminates.
+<kbd>no-disconnect-hup</kbd> cancels <kbd>disconnect-hup</kbd>.<P>
+
+If one of the reading descriptors specified when the client is called
+gets a read error, or if the service is disconnected for some other
+reason, then the <kbd>SIGHUP</kbd> will be delivered <em>before</em> the
+writing end(s) of the service's reading pipe(s) are closed, so that
+the client can distinguish disconnection from reading EOF on a pipe.
+<dt><code>reset</code><dd>Resets the execution settings to the default. This is equivalent to:
+<pre>cd ~/
+reject
+no-set-environment
+suppress-args
+allow-fd 0 read
+allow-fd 1-2 write
+reject-fd 3-
+disconnect-hup</pre>
+</dl>
+
+
+If no <kbd>execute</kbd>, <kbd>execute-from-path</kbd>,
+<kbd>execute-from-directory</kbd> or <kbd>builtin</kbd> is interpreted before
+all the files are read then the request is rejected.
+
+<hr>
+<h2><A name="s-configerrors">
+4.3 Errors in the configuration file
+</A></h2>
+
+If a syntax error or other problem occurs when processing a
+configuration file then a diagnostic will be issued, to wherever the
+error messages are currently being sent (see the <kbd>errors-</kbd> family
+of directives, above).<P>
+
+The error will cause processing of the configuration files to cease at
+that point, unless the error was inside a <kbd>catch-quit</kbd> construct.
+In this case the settings controlling the program's execution will be
+reset to the defaults as if a <kbd>reset</kbd> directive had been issued,
+and parsing continues after <kbd>hctac</kbd>.
+
+<hr>
+<h2><A name="s-defaults">
+4.4 Defaults
+</A></h2>
+
+The default configuration processing is as if the daemon were parsing
+an overall configuration file whose contents were as follows:
+
+<pre>reset
+user-rcfile ~/.userv/rc
+errors-to-stderr
+include /etc/userv/system.default
+if grep service-user-shell /etc/shells
+ errors-push
+ catch-quit
+ include-ifexist <var>file specified by most recent user-rcfile directive</var>
+ hctac
+ srorre
+fi
+include /etc/userv/system.override
+quit</pre><P>
+
+If one of the <kbd>--override</kbd> options to the client is used then it
+will instead be as if the daemon were parsing an overall configuration
+as follows:
+
+<pre>reset
+errors-to-stderr
+include <var>file containing configuration data sent by client</var>
+quit</pre>
+
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-ipass.html">next</A>; <A href="ch-envir.html">back</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - Execution environment of the service program</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 3<br>
+Execution environment of the service program
+</h1>
+
+The daemon which is handling the service user side of things will read
+configuration files to decide what to do. If it decides to allow the
+service to be provided it will fork a subprocess to execute the
+service.<P>
+
+The service will have no controlling terminal, but it will be a
+process group leader.<P>
+
+If the client is killed or times out or a file or descriptor being
+read or written by the client process gets an error then the service
+will be disconnected from the client. The client will return an exit
+status of 255 and some the service's pipes may be closed at the other
+end. The service will become a child of <kbd>init</kbd>. The service may
+well not notice the disconnection, though writing to a pipe after this
+may produce a <kbd>SIGPIPE</kbd> and the facility exists to have a
+<kbd>SIGHUP</kbd> sent to the service on disconnection.
+<hr>
+<h2><A name="s3.1">
+3.1 File descriptors
+</A></h2>
+
+The service program's standard filedescriptors, and possibly other
+file descriptors, will be connected to pipes or to
+<kbd>/dev/null</kbd>. The <kbd>userv</kbd> client/daemon pair will arrange
+that data is copied between the files or file descriptors specified to
+to the client by the caller and these these pipes.<P>
+
+Pipes which may be written to will be closed if a write error occurs
+on the corresponding client-side file or descriptor, which may result
+in a <kbd>SIGPIPE</kbd> in the service program; pipes open for reading
+will get <kbd>EOF</kbd> if the client-side file descriptor gets <kbd>EOF</kbd>
+or an error.<P>
+
+If the service closes one of its reading file descriptors the writing
+end of the corresponding pipe will generate a <kbd>SIGPIPE</kbd> when
+attempts are made by the client/daemon pair to write to it. This will
+not be considered an error; rather, the relevant pipe will be
+discarded and the corresponding file or file descriptor held by the
+client will be closed.<P>
+
+Likewise, if one of the file descriptors held by the client for
+writing by the service is a pipe whose other end is closed by the
+caller then the client/daemon pair will see an error when trying to
+copy data provided by the service. This too will not be considered an
+error; rather, the pipe correspondong to that descriptor will be
+closed and any further writes will cause the service to get a
+<kbd>SIGPIPE</kbd>.<P>
+
+Note that not all write errors or broken pipes on file descriptors may
+be visible to the service, since buffered data may be discarded by the
+operating system and there will be a finite interval between the error
+happening and the service being disconnected from the client or the
+next write causing a <kbd>SIGPIPE</kbd>.<P>
+
+Read errors on file descriptors (and disconnection) will only be
+visible to the service and distinguishable from normal end of file if
+<kbd>disconnect-hup</kbd> is in effect.<P>
+
+Read and write errors (other than broken pipes, as described above)
+will always be visible to the caller; they are system errors, and will
+therefore cause the client to print an error message to stderr and
+return with an exit status of 255.<P>
+
+If the main service program process exits while it still has running
+children any file descriptors held by those children can remain open,
+depending on the use of <code>wait</code>, <code>nowait</code> or <code>close</code> for the
+relevant file descriptor in the client's arguments. By default
+writing filedescriptors remain open and the client will wait for them
+to be closed at the service end, and reading file descriptors are
+closed immediately. These leftover child processes will not get a any
+<kbd>SIGHUP</kbd> even if a read or write error occurs or the client
+disconnects before then.
+<hr>
+<h2><A name="s3.2">
+3.2 Environment
+</A></h2>
+
+The service will have some information in environment variables:
+<dl compact>
+<dt><code>USERV_USER</code><dd>The login name of the calling user. If the <kbd>LOGNAME</kbd> variable is
+set (or, if that is unset, if the <kbd>USER</kbd> variable is set) in the
+environment passed to the client by the caller then the password entry
+for that login name will be looked up; if that password entry's uid is
+the same as that of the calling process then that login name will be
+used, otherwise (or if neither <kbd>LOGNAME</kbd> nor <kbd>USER</kbd> is set)
+the calling process's uid will be looked up to determine their login
+name (and if this lookup fails then the service will not be invoked).
+<dt><code>USERV_UID</code><dd>The uid of the calling process.
+<dt><code>USERV_GID</code><dd>The gid and supplementary group list of the calling process: first the
+group in gid and then those in the supplementary group list, in
+decimal, separated by spaces.
+<dt><code>USERV_GROUP</code><dd>The group names of the calling process, listed in the same way as the
+ids are in <kbd>USERV_GID</kbd>. If no name can be found for any of the
+calling process's group(s) then the service will not be invoked.
+<dt><code>USERV_CWD</code><dd>The client's current working directory name (this directory may not be
+accessible to the service). If it could not be determined or the
+<kbd>--hidecwd</kbd> flag was used then this variable will be set to an
+empty string (this is not considered an error).
+<dt><code>USERV_SERVICE</code><dd>The service name requested by the caller.
+<dt><code>USERV_U_</code><var>name</var><code></code><dd>The value supplied to the client by the caller using -D<var>name</var>.
+</dl>
+
+
+<kbd>HOME</kbd>, <kbd>PATH</kbd>, <kbd>SHELL</kbd>, <kbd>LOGNAME</kbd> and <kbd>USER</kbd>
+will be set appropriately (according to the details of the service
+user).
+
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-config.html">next</A>; <A href="ch-client.html">back</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - Introduction</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 1<br>
+Introduction
+</h1>
+There is a daemon which invokes user service programs (henceforth
+`services') in response to requests by callers of a companion client
+program (henceforth the `client') and according to rules set forth in
+system-wide and user-specific configuration files. The companion
+client program is setuid root, and negotiates with the daemon through
+an <kbd>AF_UNIX</kbd> socket and associated objects in a system-wide
+private directory set aside for the purpose. The user who wishes the
+service to be performed and calls the client is called the `calling
+user'; the process which calls the client is called the `calling
+process'.
+<P>
+The daemon and the client are responsible for ensuring that
+information is safely carried across the security boundary between the
+two users, and that the processes on either side cannot interact with
+each other in any unexpected ways.
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-client.html">next</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - Information passed through the client/daemon combination</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 5<br>
+Information passed through the client/daemon combination
+</h1>
+
+The information described below is the only information which passes
+between the caller and the service.
+
+<ul>
+<li>The service name supplied by the caller is available in the
+configuration language for deciding whether and which service program
+to invoke, in the <kbd>service</kbd> parameter, and is used by the
+<kbd>execute-from-directory</kbd> and <kbd>execute-from-path</kbd>
+configuration directives. It is usually used to select which service
+program to invoke. It is also passed to the service program in the
+<kbd>USERV_SERVICE</kbd> environment variable.
+<p><li>File descriptors specified by the client and allowed according to the
+configuration language will be connected. Each file descriptor is
+opened for reading or writing. Communication is via pipes, one end of
+each pipe being open on the appropriate file descriptor in the service
+program (when it is invoked) and the other end being held by the
+client process, which will read and write files it opens on behalf of
+its caller or file descriptors it is passed by its caller.<P>
+
+Data may be passed into the service through reading pipes and out of
+it through writing pipes. These pipes can remain open only until the
+service and client have terminated, or can be made to stay open after
+the client has terminated and (if the service program forks) the main
+service process has exited; the behaviour is controlled by options
+passed to the client by its caller.<P>
+
+The caller can arrange that a writing pipe be connected to a pipe or
+similar object and cause attempts to write to that descriptor by the
+service to generate a <kbd>SIGPIPE</kbd> (or <kbd>EPIPE</kbd> if
+<kbd>SIGPIPE</kbd> is caught or ignored) in the service.<P>
+
+Likewise, the service can close filedescriptors specified for reading,
+which will cause the corresponding filedescriptors passed by the
+caller to be closed, so that if these are pipes processes which write
+to them will receive <kbd>SIGPIPE</kbd> or <kbd>EPIPE</kbd>.
+<p><li>If <kbd>no-suppress-args</kbd> is set then arguments passed to the client
+by its caller will be passed on, verbatim, to the service.
+<p><li>Fatal signals and system call failures experienced by the client will
+result in the disconnection of the service from the client and
+possibly some of the communication file descriptors described above;
+if <kbd>disconnect-hup</kbd> is set then the service will also be sent a
+<kbd>SIGHUP</kbd>.
+<p><li>The value of the <kbd>LOGNAME</kbd> (or <kbd>USER</kbd>) environment variable
+as passed to the client will be used as the login name of the calling
+user if the uid of the calling process matches the uid corresponding
+to that login name. Otherwise the calling uid's password entry will
+be used to determine the calling user's login name.<P>
+
+This login name and the calling uid are available in the configuration
+language in the <kbd>calling-user</kbd> parameter and are passed to the
+service program in environment variables <kbd>USERV_USER</kbd> and
+<kbd>USERV_UID</kbd>.<P>
+
+The shell corresponding to that login name (according to the password
+entry) is available as in the configuration language's
+<kbd>calling-user-shell</kbd> parameter.<P>
+
+If no relevant password entry can be found then no service will be
+invoked.
+<p><li>The numeric values and textual names for calling gid and supplementary
+group list are available in the configuration language in the
+<kbd>calling-group</kbd> parameter and are passed to the service in
+environment variables.<P>
+
+If no name can be found for a numeric group to which the calling
+process belongs then no service will be invoked.
+<p><li>The name of the current working directory in which the client was
+invoked is passed, if available and not hidden using <kbd>--hidecwd</kbd>,
+to the service program in the <kbd>USERV_CWD</kbd> variable. This grants no
+special access to that directory unless it is a subdirectory of a
+directory which is executable (searchable) but not readable by the
+service user.
+<p><li>Settings specified by the caller using the <code>--defvar
+</code><var>name</var><code>=</code><var>value</var><code></code> option to the client are available in the
+configuration language as the corresponding <code>u-</code><var>name</var><code></code>
+parameters and are passed to the service program in environment
+variables <code>USERV_U_</code><var>name</var><code></code>.
+<p><li>If the calling user is root or the same as the service user then
+options may be given to the client which bypass the usual security
+features; in this case other information may pass between the caller
+and the service.
+<p></ul>
+
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-notes.html">next</A>; <A href="ch-config.html">back</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - Applications and notes on use</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>
+User service daemon and client specification - chapter 6<br>
+Applications and notes on use
+</h1>
+<hr>
+<h2><A name="s-standards">
+6.1 Standard services and directory management
+</A></h2>
+
+In later versions of this specification standard service names and
+interfaces for common services such as mail delivery and WWW CGI
+scripts will be specified.<P>
+
+<kbd>userv</kbd>-using applications and system services which hide
+<kbd>userv</kbd> behind wrapper scripts may need to store information in
+the user's filespace to preserve the correct placement of the security
+perimiters. Such applications should usually do so in a directory
+(created by them) <code>~/.userv/.servdata/</code><var>service</var><code></code>, where
+<var>service</var> is the service name or application in question.<P>
+
+The use of a dot-directory inside <code>~/.userv</code> will hopefully avoid
+the user becoming confused by finding parts of a semi-privileged
+application's internal state in their filespace, and or discourage
+them from fiddling with and thus corrupting it. (Note that such
+applications should of course not rely for their global integrity on
+the integrity of the data on the user's side of the security
+boundary.)
+<hr>
+<h2><A name="s-reducepriv">
+6.2 Reducing the number of absolutely privileged subsystems
+</A></h2>
+
+Currently most Unix systems have many components which need to run as
+root, even though most of their activity does not strictly require
+it. This gives rise to a large and complex body of code which must be
+trusted with the security of the system.<P>
+
+Using <kbd>userv</kbd> many of these subsystems no longer need any unusual
+privilege.<P>
+
+<kbd>cron</kbd> and <kbd>at</kbd>, <kbd>lpr</kbd> and the system's mail transfer
+agent (<kbd>sendmail</kbd>, <kbd>smail</kbd>, <kbd>exim</kbd> or the like) all
+fall into this category.
+<hr>
+<h2><A name="s-noexcess">
+6.3 Do not give away excessive privilege to <kbd>userv</kbd>-using facilities
+</A></h2>
+
+There is a danger that people reimplementing the facilities I mention
+above using <kbd>userv</kbd> will discard much of the security benefit by
+using a naive implementation technique. This will become clearer with
+an example:<P>
+
+Consider the <kbd>lpr</kbd> program. In current systems this needs to
+have an absolutely privileged component in order to support delayed
+printing without copying: when the user queues a file to be printed
+the filename is stored in the print queue, rather than a copy of it,
+and the printer daemon accesses the file directly when it is ready to
+print the job. In order that the user can print files which are not
+world-readable the daemon is given root privilege so that it can open
+the file in the context of the user, rather than its own.<P>
+
+A simple-minded approach to converting this scheme to use <kbd>userv</kbd>
+might involve giving the printer daemon (the <kbd>lp</kbd> user) the
+ability to read the file by allowing them to run <kbd>cat</kbd> (or a
+special-purpose file-reading program) as any user. The <kbd>lpr</kbd>
+program would use a <kbd>userv</kbd> service to store the filename in the
+printer daemon's queues, and the daemon would read the file later when
+it felt like it.<P>
+
+However, this would allow the printer daemon to read any file on the
+system, whether or not someone had asked for it to be printed. Since
+many files will contain passwords and other security-critical
+information this is nearly as bad as giving the daemon root access in
+the first place. Any security holes in the print server which allow a
+user to execute commands as the <kbd>lp</kbd> user will give the user the
+ability to read any file on the system.<P>
+
+Instead, it is necessary to keep a record of which files the daemon
+has been asked to print <em>outside</em> the control of the print daemon.
+This record could be kept by a new root-privileged component, but this
+is not necessary: the record of which files a user has asked to be
+printed can be kept under the control of the user in question. The
+submission program <kbd>lpr</kbd> will make a record in an area under the
+user's control before communicating with the print server, and the
+print server would be given the ability to run a special file-reading
+program which would only allow files to be read which were listed in
+the user's file of things they'd asked to print.<P>
+
+Now security holes in most of the printing system do not critically
+affect the security of the entire system: they only allow the attacker
+to read and interfere with print jobs. Bugs in the programs run by the
+print server to read users' files (and to remove entries from the list
+of files when it has done with them) will still be serious, but this
+program can be quite simple.<P>
+
+Similar considerations apply to many <kbd>userv</kbd>-based versions of
+facilities which currently run as root.<P>
+
+It is debatable whether the user-controlled state should be kept in
+the user's filespace (in dotfiles, say) or kept in a separate area set
+aside for the purpose; however, using the user's home directory (and
+probably creating a separate subdirectory of it as a dotfile to
+contain many subsystems' state) has fewer implications for the rest of
+the system and makes it entirely clear where the security boundaries
+lie.
+<hr>
+<h2><A name="s-notreally">
+6.4 <kbd>userv</kbd> is not a replacement for <kbd>really</kbd> and <kbd>sudo</kbd>
+</A></h2>
+
+<kbd>userv</kbd> is not intended as a general-purpose system
+administration tool with which system administrators can execute
+privileged programs when they need to. It is unsuitable for this
+purpose precisely because it enforces a strong separation between the
+calling and the called program, which is undesirable in this context.<P>
+
+Its facilities for restricting activities to running certain programs
+may at first glance seem to provide similar functionality to
+<kbd>sudo</kbd><A href="footnotes.html#2" name="fr2">[2]</A>. However, the
+separation mentioned above is a problem here too, particular for
+interaction - it can be hard for a <kbd>userv</kbd> service program to
+interact with its real caller or the user in question.
+<hr>
+<h2><A name="s-nogeneral">
+6.5 Don't give access to general-purpose utilities
+</A></h2>
+
+Do not specify general purpose programs like <kbd>mv</kbd> or <kbd>cat</kbd>
+in <kbd>execute-</kbd> directives without careful thought about their
+arguments, and certainly not if <kbd>no-suppress-args</kbd> is specified.
+If you do so it will give the caller much more privilige than you
+probably intend.<P>
+
+It is a shame that I have to say this here, but inexperienced
+administrators have made similar mistakes with programs like
+<kbd>sudo</kbd>.
+<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>; <A href="ch-ipass.html">back</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification - footnotes</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>User service daemon and client specification - footnotes</h1>
+<h2><A href="ch-client.html#fr1" name="1">1</A></h2>
+<P>
+<kbd>userv</kbd> is
+short for `user services', and is pronounced `you-serve'.<h2><A href="ch-notes.html#fr2" name="2">2</A></h2>
+<P>
+<kbd>sudo</kbd> is a program which allows users to
+execute certain programs as root, according to configuration files
+specified by the system administrator.<hr>
+User service daemon and client specification
+- <A href="index.html#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="index.html#toc">Contents</A>; <A href="index.html#abstract">abstract</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
--- /dev/null
+<html><head>
+<title>User service daemon and client specification</title>
+<link rev=made href="mailto:ian@davenant.greenend.org.uk">
+</head><body>
+<h1>User service daemon and client specification</h1>
+
+<h2><A name="abstract">
+0.1 Abstract
+</A></h2>
+
+This is a specification for a Unix system facility to allow one
+program to invoke another when only limited trust exists
+between them.
+
+<hr>
+<h2><A name="toc">
+0.2 Table of contents
+</A></h2>
+<ul>
+<li><A href="ch-intro.html">1 Introduction</A>
+<li><A href="ch-client.html">2 Client program usage
+</A>
+<ul>
+<li><A href="ch-client.html#s2.1">2.1</A> Options
+<li><A href="ch-client.html#s-optoverride">2.2</A> Security-overriding options
+</ul>
+<li><A href="ch-envir.html">3 Execution environment of the service program</A>
+<ul>
+<li><A href="ch-envir.html#s3.1">3.1</A> File descriptors
+<li><A href="ch-envir.html#s3.2">3.2</A> Environment
+</ul>
+<li><A href="ch-config.html">4 Service-side configuration</A>
+<ul>
+<li><A href="ch-config.html#s4.1">4.1</A> Configuration file syntax
+<li><A href="ch-config.html#s-directives">4.2</A> Configuration file directives
+<li><A href="ch-config.html#s-configerrors">4.3</A> Errors in the configuration file
+<li><A href="ch-config.html#s-defaults">4.4</A> Defaults
+</ul>
+<li><A href="ch-ipass.html">5 Information passed through the client/daemon combination</A>
+<li><A href="ch-notes.html">6 Applications and notes on use</A>
+<ul>
+<li><A href="ch-notes.html#s-standards">6.1</A> Standard services and directory management
+<li><A href="ch-notes.html#s-reducepriv">6.2</A> Reducing the number of absolutely privileged subsystems
+<li><A href="ch-notes.html#s-noexcess">6.3</A> Do not give away excessive privilege to <kbd>userv</kbd>-using facilities
+<li><A href="ch-notes.html#s-notreally">6.4</A> <kbd>userv</kbd> is not a replacement for <kbd>really</kbd> and <kbd>sudo</kbd>
+<li><A href="ch-notes.html#s-nogeneral">6.5</A> Don't give access to general-purpose utilities
+</ul>
+</ul>
+<hr><h2><A name="copyright">0.3 Copyright</A></h2>
+<kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.<P>
+
+<kbd>userv</kbd> is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.<P>
+
+This program is distributed in the hope that it will be useful, but
+<em>without any warranty</em>; without even the implied warranty of
+<em>merchantability</em> or <em>fitness for a particular purpose</em>. See
+the GNU General Public License for more details.<P>
+
+You should have received a copy of the GNU General Public License
+along with <kbd>userv</kbd>; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+<hr>
+User service daemon and client specification
+- <A href="#copyright"><kbd>userv</kbd> is Copyright 1996-1999 Ian Jackson.</A>
+<br>
+<A href="#toc">Contents</A>; <A href="#abstract">abstract</A>.
+<br>
+<address>0.61.1<br>
+Ian Jackson <A href="mailto:ian@davenant.greenend.org.uk">ian@davenant.greenend.org.uk</A></address>
+</body></html>
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--- /dev/null
+<!doctype debiandoc system>
+
+<book>
+<title>User service daemon and client specification
+<author>Ian Jackson <email>ian@davenant.greenend.org.uk
+<version>0.61.1</version>
+
+<abstract>
+This is a specification for a Unix system facility to allow one
+program to invoke another when only limited trust exists
+between them.
+
+<copyright>
+<prgn/userv/ is Copyright 1996-1999 Ian Jackson.
+<p>
+
+<prgn/userv/ is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or (at
+your option) any later version.
+<p>
+
+This program is distributed in the hope that it will be useful, but
+<em/without any warranty/; without even the implied warranty of
+<em/merchantability/ or <em/fitness for a particular purpose/. See
+the GNU General Public License for more details.
+<p>
+
+You should have received a copy of the GNU General Public License
+along with <prgn/userv/; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+<toc sect>
+
+<chapt id="intro">Introduction
+<p>
+There is a daemon which invokes user service programs (henceforth
+`services') in response to requests by callers of a companion client
+program (henceforth the `client') and according to rules set forth in
+system-wide and user-specific configuration files. The companion
+client program is setuid root, and negotiates with the daemon through
+an <prgn/AF_UNIX/ socket and associated objects in a system-wide
+private directory set aside for the purpose. The user who wishes the
+service to be performed and calls the client is called the `calling
+user'; the process which calls the client is called the `calling
+process'.
+
+<p>
+The daemon and the client are responsible for ensuring that
+information is safely carried across the security boundary between the
+two users, and that the processes on either side cannot interact with
+each other in any unexpected ways.
+
+<chapt id="client">Client program usage
+
+<p>
+<example>
+userv <var/options/ [--] <var/service-user/ <var/service-name/ [<var/argument/ ...]
+userv <var/options/ -B|--builtin [--] <var/builtin-service/ [<var/info-argument/ ...]
+</example>
+<p>
+
+<var/service-user/ specifies which user is to provide the service.
+The user may be a login name or a numeric uid, or <tt/-/ to indicate
+that the service user is to be the same as the calling user.
+<p>
+
+The service name is interpreted by the userv<footnote><prgn/userv/ is
+short for `user services', and is pronounced `you-serve'.</footnote>
+daemon on behalf of the service user. It will often be the name of a
+program.
+
+<sect>Options
+<p>
+
+Single-letter options may be combined as is usual with Unix programs,
+and the value for such an option may appear in the same argument or in
+the next.
+
+<taglist>
+<tag/<tt/-B//
+<tag/<tt/--builtin//
+<item>
+Requests that a builtin service be provided. This is equivalent to
+using the <prgn/--override/ option to specify a string consisting of
+<prgn/execute-builtin/ followed by the <var/builtin-service/
+requested, and requesting a service user of <tt/-/ (indicating the
+calling user).
+<p>
+
+If the builtin service being requested requires a
+<var/service-argument/ then this must be supplied to the client in the
+same argument as the <var/builtin-service/. See <ref
+id="dirs-execution"> for details of the builtin services available,
+and <ref id="optoverride"> for details of the <prgn/--override/
+options.
+<p>
+
+The actual service name passed will be the <var/builtin-service/; note
+that this actual service name (as opposed to the override data) and
+the <var/info-argument/s supplied will be ignored by most builtin
+services; the override mechanism and <prgn/execute-builtin/ will be
+used to ensure that the right builtin service is called with the right
+<var/service-argument/s.
+
+<tag/<tt/-f<var/fd/[<var/modifiers/]=<var/filename///
+<tag/<tt/--file <var/fd/[<var/modifiers/]=<var/filename///
+<item>
+Requests that data be copied in and out of the service using pipes.
+For each file or descriptor this will be done by creating a pipe, one
+end of which is passed to the service program and the other end of
+which is passed to a copy of <prgn/cat/ invoked by the client; the
+other file descriptor passed to <prgn/cat/ will be one inherited by
+the client program from the caller or one opened by the client program
+on behalf of the caller.
+<p>
+
+The descriptor in the service program that should be connected must be
+specified as <var/fd/, either as a decimal number or as one of the
+strings <tt/stdin/, <tt/stdout/ or <tt/stderr/. The next argument is
+a filename which will be opened by the client with the privileges of
+the calling user.
+
+<p>
+<var/modifiers/ is used to specify whether the file or descriptor is
+to be read from or written to. It consists of a series of words
+separated by commas. A comma may separate the <var/modifiers/ from
+the <var/fd/ and is required if <var/fd/ is not numeric.
+
+<p>
+The modifier words are:
+<taglist compact>
+<tag/<tt/read//
+<item>
+<tt/O_RDONLY/: Allow reading and not writing. May not be used with
+<tt/write/ or things that imply it.
+
+<tag/<tt/write//
+<item>
+<tt/O_WRONLY/: Allow writing and not reading. <em/Doesn't truncate or
+create/ without <tt/truncate/ or <tt/create/. <tt/write/ or things
+that imply it may not be used with <tt/read/.
+
+<tag/<tt/overwrite//
+<item>
+Equivalent to <tt/write,create,truncate/.
+
+<tag/<tt/create//
+<tag/<tt/creat//
+<item>
+<tt/O_CREAT/: Creates the file if necessary. Implies <tt/write/.
+
+<tag/<tt/exclusive//
+<tag/<tt/excl//
+<item>
+<tt/O_EXCL/: Fails if the file already exists. Implies <tt/write/ and
+<tt/create/. May not be used with <tt/truncate/.
+
+<tag/<tt/truncate//
+<tag/<tt/trunc//
+<item>
+<tt/O_TRUNC/: Truncate any existing file. Implies <tt/write/.
+May not be used with <tt/exclusive/.
+
+<tag/<tt/append//
+<item>
+<tt/O_APPEND/: All writes will append to the file. Implies <tt/write/
+(but not <tt/create/).
+
+<tag/<tt/sync//
+<item>
+<tt/O_SYNC/: Do writes synchronously. Implies <tt/write/.
+
+<tag/<tt/wait//
+<tag/<tt/nowait//
+<tag/<tt/close//
+<item>
+
+These modifiers control the behaviour of the client, with respect to
+the pipes carrying data to and from the service, when the service
+terminates. See below.
+
+<tag/<tt/fd//
+<item>
+The <var/filename/ is not a filename but a numeric file descriptor.
+One or both of <tt/read/ and <tt/write/ must be specified, and no
+other words are allowed. The <var/filename/ may also be <tt/stdin/,
+<tt/stdout/ or <tt/stderr/ for file descriptor 0, 1 or 2 respectively.
+
+</taglist>
+<p>
+
+If no <var/modifiers/ which imply <tt/read/ or <tt/write/ are used it
+is as if <tt/write/ had been specified, except that if the
+filedescriptor 0 of the service is being opened (either specified
+numerically or with <tt/stdin/) it is as if <tt/overwrite/ had been
+specified (or <tt/write/ if only <tt/fd/ was specified).
+<p>
+
+The client will also use <tt/O_NOCTTY/ when opening files specified by
+the caller, to avoid changing its controlling terminal.
+<p>
+
+By default stdin, stdout and stderr of the service will be connected
+to the corresponding descriptors on the client. Diagnostics from
+the client and daemon will also appear on stderr.
+<p>
+
+If <tt/wait/ is specified, the client will wait for the pipe to be
+closed, and only exit after this has happened. This means that either
+the receiving end of the pipe connection was closed while data was
+still available at the sending end, or that the end of file was
+reached on the reading file descriptor. Errors encountered reading or
+writing in the client at this stage will be considered a system error
+and cause the client to exit with status 255, but will not cause
+disconnection at the service side since the service has already
+exited.
+<p>
+
+If <tt/close/ is specified the client will immediately close the pipe
+connection by killing the relevant copy of <prgn/cat/. If the service
+uses the descriptor it will get <prgn/SIGPIPE/ (or <prgn/EPIPE/) for a
+writing descriptor or end of file for a reading one; the descriptor
+opened by or passed to the client will also be closed.
+<p>
+
+If <tt/nowait/ is specified then the client will not wait and the
+connection will remain open after the client terminates. Data may
+continue to be passed between the inheritors of the relevant
+descriptor on the service side and the corresponding file or
+descriptor on the client side until either side closes their
+descriptor. This should not usually be specified for stderr (or
+stdout if <tt/--signals stdout/ is used) since diagnostics from
+the service side may arrive after the client has exited and be
+confused with expected output.
+<p>
+
+The default is <tt/wait/ for writing file descriptors and <tt/close/
+for reading ones.
+
+<tag/<tt/-w<var/fd/=<var/action///
+<tag/<tt/--fdwait<var/fd/=<var/action///
+<item>
+Sets the action on termination of the service for the specified file
+descriptor; <var/action/ must be <tt/wait/, <tt/nowait/ or <tt/close/
+as described above. The file descriptor must be specified as open
+when this option is encountered; this option is overridden by any
+later <prgn/--file/ or <prgn/--fdwait/ option - even by a
+<prgn/--file/ which does not specify an action on termination (in this
+case the default will be used, as described above).
+
+<tag/<tt/-D<var/name/=<var/value///
+<tag/<tt/--defvar <var/name/=<var/value///
+<item>
+Set a user-defined variable <var/name/ to <var/value/. These
+user-defined variables are made available in the configuration
+language as the parameters <tt/u-<var/name// and are passed to the
+service in environment variables <tt/USERV_U_<var/name//. <var/name/
+may contain only alphanumerics and underscores, and must start with a
+letter. If several definitions are given for the same <var/name/ then
+only the last is effective.
+
+<tag/<tt/-t <var/seconds///
+<tag/<tt/--timeout <var/seconds///
+<item>
+Time out the service if it takes longer than <var/seconds/ seconds (a
+positive integer, in decimal). Timeout will produce a diagnostic on
+stderr and an exit status of 255. If <var/seconds/ is zero then no
+timeout will be implemented (this is the default).
+
+<tag/<tt/-S/ <var/method//
+<tag/<tt/--signals/ <var/method//
+<item>
+Affects the handling of the exit status when the service terminates
+due to a signal. (The client will always finish by calling
+<prgn/_exit/, so that only numbers from 0 to 255 can be returned and
+not the full range of numbers and signal indications which can be
+returned by the <prgn/wait/ family of system calls.)
+<p>
+
+The <var/method/ may be one of the following:
+<taglist compact>
+<tag/<var/status/
+<item>
+The client's exit status will be <var/status/. This will not be
+distinguishable from the service really having exited with code
+<var/status/. This method is the default, with a <var/status/ of 254.
+
+<tag/<tt/number//
+<tag/<tt/number-nocore//
+<item>
+The client's exit status will be the number of the signal which caused
+the termination of the service. If <tt/number/ is used rather than
+<tt/number-nocore/ then 128 will be added if the service dumped core.
+<tt/number/ is very like the exit code mangling done by the Bourne
+shell.
+
+<tag/<tt/highbit//
+<item>The client's exit status will be the number of the signal with
+128 added. If the service exits normally with an exit code of greater
+than 127 then 127 will be returned.
+
+<tag/<tt/stdout//
+<item>
+The service's numeric wait status as two decimal numbers (high byte
+first) and a textual description of its meaning will be printed to the
+client's standard output. It will be preceded by a newline and
+followed by an extra newline, and the numbers are separated from each
+other and from the textual description by single spaces. The exit
+status of the client will be zero, unless a system error occurs in
+which case no exit status and description will be printed to stdout,
+and an error message will be printed to stderr as usual.
+</taglist>
+
+<p>
+Problems such as client usage errors, the service not being found or
+permission being denied or failure of a system call are system errors.
+An error message describing the problem will be printed on the
+client's stderr, and the client's exit status will be 255. If the
+client dies due to a signal this should be treated as a serious system
+error.
+
+<tag/<tt/-H//
+<tag/<tt/--hidecwd//
+<item>
+Prevents the calling process's current directory name from being
+passed to the service; the null string will be passed instead.
+
+<tag/<tt/-P//
+<tag/<tt/--sigpipe//
+<item>
+If the service program is terminated due to a <prgn/SIGPIPE/ the exit
+status of the client will be zero, even if it would have been
+something else according to the exit status method specified. This
+option has no effect on the code and description printed if the exit
+status method <tt/stdout/ is in use.
+
+<tag/<tt/-h//
+<tag/<tt/--help//
+<tag/<tt/--copyright//
+<item>
+<tt/-h/ or <tt/--help/ prints the client's usage message;
+<tt/--copyright/ prints the copyright and lack of warranty notice.
+
+</taglist>
+
+<sect id="optoverride">Security-overriding options
+<p>
+
+There are also some options which are available for debugging and to
+allow the system administrator to override a user's policy. These
+options are available only if the client is called by root or if the
+calling user is the same as the service user.
+
+<taglist>
+
+<tag/<tt/--override <var/configuration-data///
+<tag/<tt/--override-file <var/filename///
+<item>
+Do not read the usual configuration files. Instead, the client sends
+<var/configuration-data/ (followed by a newline) or the contents of
+<var/filename/ (which is opened in the context of the client) to the
+daemon and the daemon uses that data instead. The
+<var/configuration-data/ must all be in one argument. It will have a
+single newline appended so that a single directive can easily be
+given, but if more than one directive is required it will have to
+contain one or more real newlines.
+
+<tag/<tt/--spoof-user <var/user///
+<item>
+Pretend to the service that it is being called by <var/user/ (which
+may be a username or a uid). This will also affect the group and
+supplementary groups supplied to the service; they will be the
+standard group and supplementary groups for <var/user/. The
+<tt/--spoof-user/ option will <em/not/ affect which user is chosen if
+the service user is specified as just <tt/-/; in this case the service
+user will be the real calling user.
+
+</taglist>
+
+
+<chapt id="envir">Execution environment of the service program
+<p>
+
+The daemon which is handling the service user side of things will read
+configuration files to decide what to do. If it decides to allow the
+service to be provided it will fork a subprocess to execute the
+service.
+<p>
+
+The service will have no controlling terminal, but it will be a
+process group leader.
+<p>
+
+If the client is killed or times out or a file or descriptor being
+read or written by the client process gets an error then the service
+will be disconnected from the client. The client will return an exit
+status of 255 and some the service's pipes may be closed at the other
+end. The service will become a child of <prgn/init/. The service may
+well not notice the disconnection, though writing to a pipe after this
+may produce a <prgn/SIGPIPE/ and the facility exists to have a
+<prgn/SIGHUP/ sent to the service on disconnection.
+
+<sect>File descriptors
+<p>
+
+The service program's standard filedescriptors, and possibly other
+file descriptors, will be connected to pipes or to
+<prgn>/dev/null</>. The <prgn/userv/ client/daemon pair will arrange
+that data is copied between the files or file descriptors specified to
+to the client by the caller and these these pipes.
+<p>
+
+Pipes which may be written to will be closed if a write error occurs
+on the corresponding client-side file or descriptor, which may result
+in a <prgn/SIGPIPE/ in the service program; pipes open for reading
+will get <prgn/EOF/ if the client-side file descriptor gets <prgn/EOF/
+or an error.
+<p>
+
+If the service closes one of its reading file descriptors the writing
+end of the corresponding pipe will generate a <prgn/SIGPIPE/ when
+attempts are made by the client/daemon pair to write to it. This will
+not be considered an error; rather, the relevant pipe will be
+discarded and the corresponding file or file descriptor held by the
+client will be closed.
+<p>
+
+Likewise, if one of the file descriptors held by the client for
+writing by the service is a pipe whose other end is closed by the
+caller then the client/daemon pair will see an error when trying to
+copy data provided by the service. This too will not be considered an
+error; rather, the pipe correspondong to that descriptor will be
+closed and any further writes will cause the service to get a
+<prgn/SIGPIPE/.
+<p>
+
+Note that not all write errors or broken pipes on file descriptors may
+be visible to the service, since buffered data may be discarded by the
+operating system and there will be a finite interval between the error
+happening and the service being disconnected from the client or the
+next write causing a <prgn/SIGPIPE/.
+<p>
+
+Read errors on file descriptors (and disconnection) will only be
+visible to the service and distinguishable from normal end of file if
+<prgn/disconnect-hup/ is in effect.
+<p>
+
+Read and write errors (other than broken pipes, as described above)
+will always be visible to the caller; they are system errors, and will
+therefore cause the client to print an error message to stderr and
+return with an exit status of 255.
+<p>
+
+If the main service program process exits while it still has running
+children any file descriptors held by those children can remain open,
+depending on the use of <tt/wait/, <tt/nowait/ or <tt/close/ for the
+relevant file descriptor in the client's arguments. By default
+writing filedescriptors remain open and the client will wait for them
+to be closed at the service end, and reading file descriptors are
+closed immediately. These leftover child processes will not get a any
+<prgn/SIGHUP/ even if a read or write error occurs or the client
+disconnects before then.
+
+<sect>Environment
+<p>
+
+The service will have some information in environment variables:
+<taglist compact>
+<tag/<tt/USERV_USER//
+<item>
+The login name of the calling user. If the <prgn/LOGNAME/ variable is
+set (or, if that is unset, if the <prgn/USER/ variable is set) in the
+environment passed to the client by the caller then the password entry
+for that login name will be looked up; if that password entry's uid is
+the same as that of the calling process then that login name will be
+used, otherwise (or if neither <prgn/LOGNAME/ nor <prgn/USER/ is set)
+the calling process's uid will be looked up to determine their login
+name (and if this lookup fails then the service will not be invoked).
+
+<tag/<tt/USERV_UID//
+<item>
+The uid of the calling process.
+
+<tag/<tt/USERV_GID//
+<item>
+The gid and supplementary group list of the calling process: first the
+group in gid and then those in the supplementary group list, in
+decimal, separated by spaces.
+
+<tag/<tt/USERV_GROUP//
+<item>
+The group names of the calling process, listed in the same way as the
+ids are in <prgn/USERV_GID/. If no name can be found for any of the
+calling process's group(s) then the service will not be invoked.
+
+<tag/<tt/USERV_CWD//
+<item>
+The client's current working directory name (this directory may not be
+accessible to the service). If it could not be determined or the
+<prgn/--hidecwd/ flag was used then this variable will be set to an
+empty string (this is not considered an error).
+
+<tag/<tt/USERV_SERVICE//
+<item>
+The service name requested by the caller.
+
+<tag/<tt/USERV_U_<var/name///
+<item>
+The value supplied to the client by the caller using -D<var/name/.
+
+</taglist>
+
+<prgn/HOME/, <prgn/PATH/, <prgn/SHELL/, <prgn/LOGNAME/ and <prgn/USER/
+will be set appropriately (according to the details of the service
+user).
+
+
+<chapt id="config">Service-side configuration
+<p>
+
+Which services may be run by whom and under what conditions is
+controlled by configuration files.
+<p>
+
+The daemon will read these files in order. Certain directives in the
+files modify the daemon's execution settings for invoking the service,
+for example allowing certain file descriptors to be specified by the
+client or specifying which program to execute to provide the service.
+<p>
+
+The <em/last/ instance of each such setting will take effect. The
+directives which specify which program to execute will not stop the
+configuration file from being read; they will be remembered and will
+only take effect if they are not overridden by a later directive.
+<p>
+
+The daemon will first read <tt>/etc/userv/system.default</>. Then, by
+default (this behaviour may be modified), it will read a per-user file
+<tt>~/.userv/rc</>, if it exists and the service user's shell is in
+<tt>/etc/shells</>. Finally it will read
+<tt>/etc/userv/system.override</>.
+<p>
+
+When it has read all of these files it will act according to the
+currently values of of the execution settings.
+
+<sect>Configuration file syntax
+<p>
+
+The configuration file is a series of directives, usually one per
+line. The portion of a line following a hash character <tt/#/ is
+taken as a comment and ignored. Each directive consists of a series
+of tokens separated by linear whitespace (spaces and tabs); tokens may
+be words consisting of non-space characters, or, where a string is
+required, a string in double quotes. Double-quoted strings may
+contain the following backslash escapes:
+
+<taglist compact>
+<tag/<tt/\n//<item>newline
+<tag/<tt/\t//<item>tab
+<tag/<tt/\r//<item>carriage return
+<tag/<tt/\<var/OOO///<item>character whose octal code is <var/OOO/
+<tag/<tt/\x<var/XX///<item>character whose hex code is <var/XX/
+<tag/<tt/\<var/punctuation///<item>literal punctuation character (eg <tt/\\/, <tt/\"/)
+<tag/<tt/\<var/newline// (ie, backslash at end of line)/
+<item>string continues on next line
+</taglist>
+<p>
+
+Relative pathnames in directives are relative to the service program's
+current directory (usually the service user's home directory).
+Pathnames starting with the two characters <tt>~/</> are taken to be
+relative to the service user's home directory.
+
+<sect id="directives">Configuration file directives
+<p>
+
+<sect1 id="dirs-immediate">Immediate directives
+<p>
+
+The following directives take effect immediately:
+
+<taglist>
+<tag/<tt/cd <var/pathname///
+<item>
+Change directory in the service program. <prgn/cd/ is cumulative. It
+is an error if the directory cannot be changed to.
+<p>
+
+<prgn/cd/ should not be used between <prgn/execute-from-directory/ and
+the invocation of the service program, as the test for the
+availability of the service program would be done with the old current
+directory and the actual execution with the new (probably causing an
+error).
+
+<tag/<tt/eof//
+<item>
+Stop reading the configuration file in question, as if end of file had
+been reached. Any control constructs (<prgn/if/, <prgn/catch-quit/ or
+<prgn/errors-push/) which were started in that file will be considered
+finished. Parsing will continue in the file which caused the file
+containing the <prgn/eof/ to be read.
+
+<tag/<tt/quit//
+<item>
+Stop reading configuration files and act immediately on the current
+settings. The behaviour of <prgn/quit/ is subject to the
+<prgn/catch-quit/ control construct.
+
+<tag/<tt/include <var/filename///
+<tag/<tt/include-ifexist <var/filename///
+<item>
+Read the configuration file <var/filename/, and then return to this
+file and continue parsing it with the next directive. It is an error
+if the file cannot be opened and read, unless <prgn/include-ifexist/
+is used and the file does not exist, in which case the directive is
+silently ignored.
+
+<tag/<tt/include-lookup <var/parameter/ <var/directory///
+<tag/<tt/include-lookup-all <var/parameter/ <var/directory///
+<item>
+Read the configuration file in <var/directory/ whose name is the value
+of <var/parameter/ (see the description of <prgn/if/, <ref
+id="dirs-control">). If <var/parameter/ has several values they will
+be tried in order; with <prgn/include-lookup/ this search will stop
+when one is found, but with <prgn/include-lookup-all/ the search will
+continue and any files appropriate to other values will be read too.
+<p>
+
+If none of the parameter's values had a corresponding file then the
+file <tt/:default/ will be read, if it exists. If <var/parameter/'s
+list of values was empty then the file <tt/:none/ will be tried first
+and read if it exists, otherwise <tt/:default/ will be tried.
+<p>
+
+It is not an error for any of the files (including <tt/:default/) not
+to exist, but it is an error if a file exists and cannot be read or if
+the directory cannot be accessed.
+
+<p>
+A translation will be applied to values before they are used to
+construct a filename, so that the lookup cannot access dotfiles or
+files in other directories: values starting with full stops will have
+a colon prepended (making <tt/:./), colons will be doubled, and each
+slash will be replaced with a colon followed by a hyphen <tt>:-</>. A
+parameter value which is the empty string will be replaced with
+<tt/:empty/ (note that this is different from a parameter not having
+any values).
+
+<tag/<tt/include-directory <var/directory///
+<item>
+Read configuration from all files in directory <var/directory/ which
+are plain files whose names consist only of alphanumerics and hyphens
+and start with an alphanumeric. They will be read in lexical order.
+It is an error for the directory not to exist or for it or any of the
+files found not to be read successfully, or for anything with an
+appropriate name not to be a plain file or a symbolic link to a plain
+file.
+
+<tag/<tt/error <var/text ...///
+<item>
+Causes an error whose message includes the descriptive string
+<var/text/. <var/text/ may consist of several tokens with intervening
+whitespace. The whitespace will be included in the message as found
+in the configuration file: all the characters until the end of the
+line will be included verbatim, unless they are part of a
+double-quoted string, in which case the usual meaning of the string
+(i.e., after backslash escape processing) will be used. Comments and
+linear whitespace at the end of the line (or just before the comment)
+will still be ignored.
+
+<tag/<tt/message <var/text ...///
+<item>
+Causes a message including the descriptive string <var/text/ to be
+delivered as if it were an error message, but does not actually cause
+an error.
+</taglist>
+
+<sect1 id="dirs-delayed">Directives with delayed effect
+<p>
+
+The following directives have no immediate effect, but are remembered
+and have an effect on later processing of the configuration files.
+
+<taglist>
+<tag/<tt/user-rcfile <var/filename///
+<item>
+Specifies that the file <var/filename/ should be read instead of the
+user's <tt>~/.userv/rc</>. This does <em/not/ happen immediately;
+instead, the setting is remembered and used after the
+<prgn/system.default/ configuration file has been read. This
+directive has no effect in a user's configuration file or in the
+<prgn/system.override/ file, as the user's configuration file has
+already been found and read by then and will not be re-read.
+
+<tag/<tt/errors-to-stderr//
+<item>
+Causes error messages to be delivered to the client's stderr.
+
+<tag/<tt/errors-to-file/ <var/filename//
+<item>
+Error messages will be written to <var/filename/, which will be opened
+in the context of and with the privileges of the service user.
+
+<tag/<tt/errors-to-syslog/ [<var/facility/ [<var/level/]]/
+<item>
+Error messages will be delivered using <prgn/syslog/. The default
+<var/facility/ is <tt/user/; the default <var/level/ is <tt/error/.
+</taglist>
+
+<sect1 id="dirs-control">Control structure directives
+<p>
+
+The following directives are used to create control structures. If
+the end of the file is encountered before the end of any control
+structure which was started inside it then that control structure is
+considered finished. This is not an error.
+
+<taglist>
+<tag/<tt/if <var/condition///
+<tag/<tt/elif <var/condition///
+<tag/<tt/else//
+<tag/<tt/fi//
+<item>
+Lines following <prgn/if/ are interpreted only if the condition is
+true. Many conditions are properties of parameter values. Most
+parameters have a single string as a value; however, some may yield
+zero or several strings, in which case the condition is true if it is
+true of any of the strings individually. Parameters are described
+below.
+<p>
+
+The conditions are:
+
+<taglist compact>
+<tag/<tt/glob <var/parameter/ <var/glob-pattern/ ...//
+<item>
+The value of the parameter whose name is given matches one of the glob
+patterns (anchored at both ends; backslashes can be used to escape
+metacharacters).
+
+<tag/<tt/range <var/parameter/ <var/min/ <var/max///
+<item>
+The value of the parameter is a nonnegative integer and lies within
+the range specified. <var/min/ or <var/max/ may be <tt/$/ to indicate
+no lower or upper limit, respectively.
+
+<tag/<tt/grep <var/parameter/ <var/filename///
+<item>
+The <var/filename/ refers to a file one of whose lines is the value of
+the parameter (leading or trailing whitespace on each line and empty
+lines in the file are ignored). It is an error for the file not to be
+opened and read.
+
+<tag/<tt/! <var/condition///
+<item>
+The <var/condition/ is <em/not/ true.
+
+<tag/Conjunctions: <tt/&/ and <tt/|//
+<item>
+<example>
+( <var/condition/
+& <var/condition/
+& <var/condition/
+...
+)
+</example>
+is true if all the listed conditions are true; where <tt/|/ is used it
+is true if any of them is true. Newlines must be used to separate one
+condition from the next, as shown, and the parentheses are mandatory.
+These conjunctions do not do lazy evaluation.
+</taglist>
+<p>
+
+The parameters are:
+
+<taglist compact>
+<tag/<tt/service//
+<item>
+The service name specified when the client was called.
+
+<tag/<tt/calling-user//
+<item>
+Two strings: the login name of the calling user (determined as for
+<prgn/USERV_USER/, above) and the calling uid (represented in
+decimal).
+
+<tag/<tt/calling-group//
+<item>
+Several strings: the primary and supplementary group names and gids
+(in decimal) of the calling process. All the group names come first,
+and then the gids. If the first supplementary group is the same as
+the primary group then it is elided.
+
+<tag/<tt/calling-user-shell//
+<item>
+The calling user's shell, as listed in the password entry for the
+calling login name (as determined for <prgn/USERV_USER/, above).
+
+<tag/<tt/service-user//
+<item>
+Two strings: the name of the service user (as specified to the client)
+and their uid (represented in decimal).
+
+<tag/<tt/service-group//
+<item>
+Several strings: the primary and supplementary group names and gids
+(in decimal) of the service user.
+
+<tag/<tt/service-user-shell//
+<item>
+The service user's shell, as listed in their password entry.
+
+<tag/<tt/u-<var/name///
+<item>
+The value of the user-defined variable <var/name/ passed by the caller
+using the <prgn/--defvar/ command-line option to the client. If the
+variable was not defined then this parameter is an empty list of
+strings; in this case any condition which tests it will be false, and
+<tt/include-lookup/ on it will read the <tt/:none/ file, or
+<tt/:default/ if <tt/:none/ is not found.
+
+</taglist>
+
+<tag/<tt/errors-push/ <var/filename//
+<tag/<tt/srorre//
+<item>
+Stacks the error handling behaviour currently in effect. Any changes
+to error handling will take effect only between <prgn/errors-push/ and
+<prgn/srorre/.
+
+<tag/<tt/catch-quit//
+<tag/<tt/hctac//
+<item>
+Any use of <prgn/quit/ inside <prgn/catch-quit/ will merely cause the
+parsing to continue at <prgn/hctac/ instead. Any control constructs
+started since the <prgn/catch-quit/ will be considered finished if a
+<prgn/quit/ is found.
+<p>
+
+If an error occurs inside <prgn/catch-quit/ the execution settings
+will be reset (as if by the <prgn/reset/ directive) and parsing will
+likewise continue at <prgn/hctac/.
+<p>
+
+If a lexical or syntax error is detected in the same configuration
+file as the <prgn/catch-quit/, while looking for the <prgn/hctac/
+after an error or <prgn/quit/, that new error will not be caught.
+
+</taglist>
+
+<sect1 id="dirs-execution">Directives for changing execution settings
+<p>
+
+The following directives modify the execution settings; the server
+will remember the fact that the directive was encountered and act on
+it only after all the configuration has been parsed. The <em/last/
+directive which modifies any particuar setting will take effect.
+
+<taglist>
+<tag/<tt/reject//
+<item>
+Reject the request. <prgn/execute/, <prgn/execute-from-directory/ and
+<prgn/execute-from-path/ will change this setting.
+
+<tag/<tt/execute <var/program/ [<var/argument/ ...]//
+<item>
+Execute the program <var/program/, with the arguments as specified,
+followed by any arguments given to the client if
+<prgn/no-suppress-args/ is in effect. It is an error for the
+execution to fail when it is attempted (after all the configuration
+has been parsed). If <var/program/ does not contain a slash it will
+be searched for on the service user's path.
+
+<tag/<tt/execute-from-directory <var/pathname/ [<var/argument/ ...]//
+<item>
+Take all the characters after the last slash of the service name
+specified when the client was called, and execute that program in the
+directory named by <var/pathname/ as if it had been specified for
+<var/execute/. The part of the service name used may contain only
+alphanumerics and hyphens and must start with an alphanumeric (and it
+must be non-empty), otherwise it is an error.
+<p>
+
+This directive is ignored if the relevant program does not exist in
+the directory specified; in this case the program to execute is left
+at its previous setting (or unset, if it was not set before).
+<p>
+
+It is an error for the test for the existence of the program to fail
+other than with a `no such file or directory' indication. It is also
+an error for the execution to fail if and when it is attempted (after
+all the configuration has been parsed).
+
+<tag/<tt/execute-from-path//
+<item>
+<var/service/ is interpreted as a program on the default <prgn/PATH/
+(or as a pathname of an executable, if it contains a <tt>/</>). This
+directive is <em/very dangerous/, and is only provided to make the
+<prgn/--override/ options effective. It should not normally be used.
+It is an error for the execution to fail when it is attempted (after
+all the configuration has been parsed).
+
+<tag/<tt/execute-builtin <var/service-name/ <var/service-arguments//
+<item>
+Executes the builtin service <var/service-name/. These builtin
+services display information about the server and/or the request, and
+ignore any arguments passed from the service side except possibly to
+print them as part of their output. They write their results to their
+standard output (i.e., wherever file descriptor 1 is directed). The
+builtin services are:
+
+<taglist compact>
+<tag/<tt/execute//
+<item>
+Displays the execution settings, defined variables,
+arguments, etc. with which the builtin service was invoked.
+
+<tag/<tt/environment//
+<item>
+Displays the environment variable settings with which the builtin
+service was invoked.
+
+<tag/<tt/parameter <var/parameter///
+<item>
+Displays the values of the service configuration language parameter
+specified.
+
+<tag/<tt/version//
+<item>
+Displays the version string and compilation details of the uservd
+server program.
+
+<tag/<tt/reset//
+<item>
+Displays the default reset configuration (evaluated when <prgn/reset/
+is found in a configuration file, or when an error is caught by
+<prgn/catch-quit/).
+
+<tag/<tt/toplevel//
+<item>
+Displays the top-level default configuration (the configuration data,
+evaluated by the server, which calls all the other configuration
+files).
+
+<tag/<tt/override//
+<item>
+Displays the top-level override configuration (the configuration data,
+evaluated by the server, which causes all the other configuration data
+to be parsed).
+
+<tag/<tt/help//
+<item>
+Displays a list of the understood builtin service names and arguments.
+</taglist>
+
+In the future other builtin services may be defined which do more than
+just print information.
+
+<tag/<tt/set-environment//
+<tag/<tt/no-set-environment//
+<item>
+Runs <tt>/etc/environment</> to set the service user's environment.
+This adds the overhead of invoking a shell, but doesn't cause any
+shell (de)mangling of the service's arguments. This is achieved by
+invoking
+<example>
+.../program arg arg arg ...
+</example>
+as
+<example>
+/bin/sh -c '. /etc/environment; exec "$@"' - .../program arg arg arg ...
+</example>
+<prgn/no-set-environment/ cancels the effect of
+<prgn/set-environment/.
+
+<tag/<tt/no-suppress-args//
+<tag/<tt/suppress-args//
+<item>
+Include any arguments given to the client as arguments to the program
+invoked as a result of an <prgn/execute/,
+<prgn/execute-from-directory/ or <prgn/execute-from-path/ directive.
+<prgn/suppress-args/ undoes the effect of <prgn/no-suppress-args/.
+
+<tag/<tt/require-fd <var/fd-range/ read|write//
+<item>
+Insist that the filedescriptor(s) be opened for reading resp. writing.
+It is an error if any descriptor marked as required when the service
+is about to be invoked (after the configuration has been parsed) was
+not specified when the client was invoked. Each file descriptor has a
+separate setting, and the last one of <prgn/require-fd/,
+<prgn/allow-fd/, <prgn/ignore-fd/, <prgn/null-fd/ or <prgn/reject-fd/
+which affected a particular file descriptor will take effect.
+<p>
+
+<var/fd-range/ may be a single number, two numbers separated by a
+hyphen, or one number followed by a hyphen (indicating all descriptors
+from that number onwards). It may also be one of the words
+<tt/stdin/, <tt/stdout/ or <tt/stderr/. Open-ended file descriptor
+rangers are allowed only with <prgn/reject-fd/ and <prgn/ignore-fd/,
+as otherwise the service program would find itself with a very large
+number of file descriptors open.
+<p>
+
+When the configuration has been parsed, and before the service is
+about to be executed, stderr (fd 2) must be required or allowed
+(<prgn/require-fd/ or <prgn/allow-fd/) for writing; this is so that
+the error message printed by the server's child process if it cannot
+<prgn/exec/ the service program is not lost.
+
+<tag/<tt/allow-fd <var/fd-range/ [read|write]//
+<item>
+Allow the descriptor(s) to be opened for reading resp. writing, or
+either if neither <tt/read/ nor <tt/write/ is specified. If a
+particular descriptor not specified by the client then it will be open
+onto <tt>/dev/null</> (for reading, writing, or both, depending on
+whether <tt/read/, <tt/write/ or neither was specified).
+
+<tag/<tt/null-fd <var/fd-range/ [read|write]//
+<item>
+Specify that the descriptor(s) be opened onto <prgn>/dev/null</> for
+reading resp. writing, or both if neither <tt/read/ nor <tt/write/
+is specified. Any specification of these file descriptors by the
+client will be silently ignored; the client will see its ends of the
+descriptors being closed immediately.
+
+<tag/<tt/reject-fd <var/fd-range///
+<item>
+Do not allow the descriptor(s) to be specified by the client. It is
+an error if any descriptor(s) marked for rejection are specified when
+the service is about to be invoked (after the configuration has been
+parsed).
+
+<tag/<tt/ignore-fd <var/fd-range///
+<item>
+Silently ignore any specification by the client of those
+descriptor(s). The pipes corresponding to these descriptors will be
+closed just before the service is invoked.
+
+<tag/<tt/disconnect-hup//
+<tag/<tt/no-disconnect-hup//
+<item>
+Causes the service's process group to get a <prgn/SIGHUP/ if the
+client disconnects before the main service process terminates.
+<prgn/no-disconnect-hup/ cancels <prgn/disconnect-hup/.
+<p>
+
+If one of the reading descriptors specified when the client is called
+gets a read error, or if the service is disconnected for some other
+reason, then the <prgn/SIGHUP/ will be delivered <em/before/ the
+writing end(s) of the service's reading pipe(s) are closed, so that
+the client can distinguish disconnection from reading EOF on a pipe.
+
+<tag/<tt/reset//
+<item>
+Resets the execution settings to the default. This is equivalent to:
+<example>
+cd ~/
+reject
+no-set-environment
+suppress-args
+allow-fd 0 read
+allow-fd 1-2 write
+reject-fd 3-
+disconnect-hup
+</example>
+
+</taglist>
+
+If no <prgn/execute/, <prgn/execute-from-path/,
+<prgn/execute-from-directory/ or <prgn/builtin/ is interpreted before
+all the files are read then the request is rejected.
+
+
+<sect id="configerrors">Errors in the configuration file
+<p>
+
+If a syntax error or other problem occurs when processing a
+configuration file then a diagnostic will be issued, to wherever the
+error messages are currently being sent (see the <prgn/errors-/ family
+of directives, above).
+<p>
+
+The error will cause processing of the configuration files to cease at
+that point, unless the error was inside a <prgn/catch-quit/ construct.
+In this case the settings controlling the program's execution will be
+reset to the defaults as if a <prgn/reset/ directive had been issued,
+and parsing continues after <prgn/hctac/.
+
+
+<sect id="defaults">Defaults
+<p>
+
+The default configuration processing is as if the daemon were parsing
+an overall configuration file whose contents were as follows:
+
+<example>
+reset
+user-rcfile ~/.userv/rc
+errors-to-stderr
+include /etc/userv/system.default
+if grep service-user-shell /etc/shells
+ errors-push
+ catch-quit
+ include-ifexist <var/file specified by most recent user-rcfile directive/
+ hctac
+ srorre
+fi
+include /etc/userv/system.override
+quit
+</example>
+<p>
+
+If one of the <prgn/--override/ options to the client is used then it
+will instead be as if the daemon were parsing an overall configuration
+as follows:
+
+<example>
+reset
+errors-to-stderr
+include <var/file containing configuration data sent by client/
+quit
+</example>
+
+
+<chapt id="ipass">Information passed through the client/daemon combination
+<p>
+
+The information described below is the only information which passes
+between the caller and the service.
+
+<list>
+<item>
+The service name supplied by the caller is available in the
+configuration language for deciding whether and which service program
+to invoke, in the <prgn/service/ parameter, and is used by the
+<prgn/execute-from-directory/ and <prgn/execute-from-path/
+configuration directives. It is usually used to select which service
+program to invoke. It is also passed to the service program in the
+<prgn/USERV_SERVICE/ environment variable.
+
+<item>
+File descriptors specified by the client and allowed according to the
+configuration language will be connected. Each file descriptor is
+opened for reading or writing. Communication is via pipes, one end of
+each pipe being open on the appropriate file descriptor in the service
+program (when it is invoked) and the other end being held by the
+client process, which will read and write files it opens on behalf of
+its caller or file descriptors it is passed by its caller.
+<p>
+
+Data may be passed into the service through reading pipes and out of
+it through writing pipes. These pipes can remain open only until the
+service and client have terminated, or can be made to stay open after
+the client has terminated and (if the service program forks) the main
+service process has exited; the behaviour is controlled by options
+passed to the client by its caller.
+<p>
+
+The caller can arrange that a writing pipe be connected to a pipe or
+similar object and cause attempts to write to that descriptor by the
+service to generate a <prgn/SIGPIPE/ (or <prgn/EPIPE/ if
+<prgn/SIGPIPE/ is caught or ignored) in the service.
+<p>
+
+Likewise, the service can close filedescriptors specified for reading,
+which will cause the corresponding filedescriptors passed by the
+caller to be closed, so that if these are pipes processes which write
+to them will receive <prgn/SIGPIPE/ or <prgn/EPIPE/.
+
+<item>
+If <prgn/no-suppress-args/ is set then arguments passed to the client
+by its caller will be passed on, verbatim, to the service.
+
+<item>
+Fatal signals and system call failures experienced by the client will
+result in the disconnection of the service from the client and
+possibly some of the communication file descriptors described above;
+if <prgn/disconnect-hup/ is set then the service will also be sent a
+<prgn/SIGHUP/.
+
+<item>
+The value of the <prgn/LOGNAME/ (or <prgn/USER/) environment variable
+as passed to the client will be used as the login name of the calling
+user if the uid of the calling process matches the uid corresponding
+to that login name. Otherwise the calling uid's password entry will
+be used to determine the calling user's login name.
+<p>
+
+This login name and the calling uid are available in the configuration
+language in the <prgn/calling-user/ parameter and are passed to the
+service program in environment variables <prgn/USERV_USER/ and
+<prgn/USERV_UID/.
+<p>
+
+The shell corresponding to that login name (according to the password
+entry) is available as in the configuration language's
+<prgn/calling-user-shell/ parameter.
+<p>
+
+If no relevant password entry can be found then no service will be
+invoked.
+
+<item>
+The numeric values and textual names for calling gid and supplementary
+group list are available in the configuration language in the
+<prgn/calling-group/ parameter and are passed to the service in
+environment variables.
+<p>
+
+If no name can be found for a numeric group to which the calling
+process belongs then no service will be invoked.
+
+<item>
+The name of the current working directory in which the client was
+invoked is passed, if available and not hidden using <prgn/--hidecwd/,
+to the service program in the <prgn/USERV_CWD/ variable. This grants no
+special access to that directory unless it is a subdirectory of a
+directory which is executable (searchable) but not readable by the
+service user.
+
+<item>
+Settings specified by the caller using the <tt/--defvar
+<var/name/=<var/value// option to the client are available in the
+configuration language as the corresponding <tt/u-<var/name//
+parameters and are passed to the service program in environment
+variables <tt/USERV_U_<var/name//.
+
+<item>
+If the calling user is root or the same as the service user then
+options may be given to the client which bypass the usual security
+features; in this case other information may pass between the caller
+and the service.
+
+</list>
+
+<chapt id="notes">Applications and notes on use
+<p>
+
+<sect id="standards">Standard services and directory management
+<p>
+
+In later versions of this specification standard service names and
+interfaces for common services such as mail delivery and WWW CGI
+scripts will be specified.
+<p>
+
+<prgn/userv/-using applications and system services which hide
+<prgn/userv/ behind wrapper scripts may need to store information in
+the user's filespace to preserve the correct placement of the security
+perimiters. Such applications should usually do so in a directory
+(created by them) <tt>~/.userv/.servdata/<var/service/</>, where
+<var/service/ is the service name or application in question.
+<p>
+
+The use of a dot-directory inside <tt>~/.userv</> will hopefully avoid
+the user becoming confused by finding parts of a semi-privileged
+application's internal state in their filespace, and or discourage
+them from fiddling with and thus corrupting it. (Note that such
+applications should of course not rely for their global integrity on
+the integrity of the data on the user's side of the security
+boundary.)
+
+<sect id="reducepriv">Reducing the number of absolutely privileged subsystems
+<p>
+
+Currently most Unix systems have many components which need to run as
+root, even though most of their activity does not strictly require
+it. This gives rise to a large and complex body of code which must be
+trusted with the security of the system.
+<p>
+
+Using <prgn/userv/ many of these subsystems no longer need any unusual
+privilege.
+<p>
+
+<prgn/cron/ and <prgn/at/, <prgn/lpr/ and the system's mail transfer
+agent (<prgn/sendmail/, <prgn/smail/, <prgn/exim/ or the like) all
+fall into this category.
+
+<sect id="noexcess">Do not give away excessive privilege to <prgn/userv/-using facilities
+<p>
+
+There is a danger that people reimplementing the facilities I mention
+above using <prgn/userv/ will discard much of the security benefit by
+using a naive implementation technique. This will become clearer with
+an example:
+<p>
+
+Consider the <prgn/lpr/ program. In current systems this needs to
+have an absolutely privileged component in order to support delayed
+printing without copying: when the user queues a file to be printed
+the filename is stored in the print queue, rather than a copy of it,
+and the printer daemon accesses the file directly when it is ready to
+print the job. In order that the user can print files which are not
+world-readable the daemon is given root privilege so that it can open
+the file in the context of the user, rather than its own.
+<p>
+
+A simple-minded approach to converting this scheme to use <prgn/userv/
+might involve giving the printer daemon (the <prgn/lp/ user) the
+ability to read the file by allowing them to run <prgn/cat/ (or a
+special-purpose file-reading program) as any user. The <prgn/lpr/
+program would use a <prgn/userv/ service to store the filename in the
+printer daemon's queues, and the daemon would read the file later when
+it felt like it.
+<p>
+
+However, this would allow the printer daemon to read any file on the
+system, whether or not someone had asked for it to be printed. Since
+many files will contain passwords and other security-critical
+information this is nearly as bad as giving the daemon root access in
+the first place. Any security holes in the print server which allow a
+user to execute commands as the <prgn/lp/ user will give the user the
+ability to read any file on the system.
+<p>
+
+Instead, it is necessary to keep a record of which files the daemon
+has been asked to print <em/outside/ the control of the print daemon.
+This record could be kept by a new root-privileged component, but this
+is not necessary: the record of which files a user has asked to be
+printed can be kept under the control of the user in question. The
+submission program <prgn/lpr/ will make a record in an area under the
+user's control before communicating with the print server, and the
+print server would be given the ability to run a special file-reading
+program which would only allow files to be read which were listed in
+the user's file of things they'd asked to print.
+<p>
+
+Now security holes in most of the printing system do not critically
+affect the security of the entire system: they only allow the attacker
+to read and interfere with print jobs. Bugs in the programs run by the
+print server to read users' files (and to remove entries from the list
+of files when it has done with them) will still be serious, but this
+program can be quite simple.
+<p>
+
+Similar considerations apply to many <prgn/userv/-based versions of
+facilities which currently run as root.
+<p>
+
+It is debatable whether the user-controlled state should be kept in
+the user's filespace (in dotfiles, say) or kept in a separate area set
+aside for the purpose; however, using the user's home directory (and
+probably creating a separate subdirectory of it as a dotfile to
+contain many subsystems' state) has fewer implications for the rest of
+the system and makes it entirely clear where the security boundaries
+lie.
+
+<sect id="notreally"><prgn/userv/ is not a replacement for <prgn/really/ and <prgn/sudo/
+<p>
+
+<prgn/userv/ is not intended as a general-purpose system
+administration tool with which system administrators can execute
+privileged programs when they need to. It is unsuitable for this
+purpose precisely because it enforces a strong separation between the
+calling and the called program, which is undesirable in this context.
+<p>
+
+Its facilities for restricting activities to running certain programs
+may at first glance seem to provide similar functionality to
+<prgn/sudo/<footnote><prgn/sudo/ is a program which allows users to
+execute certain programs as root, according to configuration files
+specified by the system administrator.</footnote>. However, the
+separation mentioned above is a problem here too, particular for
+interaction - it can be hard for a <prgn/userv/ service program to
+interact with its real caller or the user in question.
+
+<sect id="nogeneral">Don't give access to general-purpose utilities
+<p>
+
+Do not specify general purpose programs like <prgn/mv/ or <prgn/cat/
+in <prgn/execute-/ directives without careful thought about their
+arguments, and certainly not if <prgn/no-suppress-args/ is specified.
+If you do so it will give the caller much more privilige than you
+probably intend.
+<p>
+
+It is a shame that I have to say this here, but inexperienced
+administrators have made similar mistakes with programs like
+<prgn/sudo/.
+
+</book>
--- /dev/null
+/*
+ * Copyright (C)1996-1997,1999 Ian Jackson
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with userv; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+
+
+
+
+
+#ifndef TOKENS_H
+#define TOKENS_H
+
+enum tokens {
+ tokm_instance= 0x000000ff,
+ tokm_repres= 0x00000f00,
+ tokm_type= 0xfffff000,
+ tokr_nonstring= 0x00000100,
+ tokr_word= 0x00000200,
+ tokr_punct= 0x00000300,
+ tokr_string= 0x00000400,
+ tokt_directive= 0x00001000,
+ tokt_controlstart= 0x00002000,
+ tokt_controlend= 0x00004000,
+ tokt_exception= 0x00008000,
+ tokt_parmcondition= 0x00010000,
+ tokt_condop= 0x00020000,
+ tokt_parameter= 0x00040000,
+ tokt_number= 0x00080000,
+ tokt_fdrange= 0x00100000,
+ tokt_logfacility= 0x00200000,
+ tokt_loglevel= 0x00400000,
+ tokt_readwrite= 0x00800000,
+ tokt_string= 0x01000000,
+ tokt_execmode= 0x02000000,
+ tokt_ehandlemode= 0x04000000,
+ tokt_builtinservice= 0x08000000,
+ tokt_misc= 0x10000000,
+ tokt_internal= 0x20000000,
+
+ toki_word_reject= 0x00000001,
+ toki_word_executefromdirectory= 0x00000002,
+ toki_word_executefrompath= 0x00000003,
+ toki_word_executebuiltin= 0x00000004,
+ toki_word_errorstostderr= 0x00000005,
+ toki_word_errorstosyslog= 0x00000006,
+ toki_word_errorstofile= 0x00000007,
+ toki_word_requirefd= 0x00000008,
+ toki_word_allowfd= 0x00000009,
+ toki_word_nullfd= 0x0000000a,
+ toki_word_rejectfd= 0x0000000b,
+ toki_word_ignorefd= 0x0000000c,
+ toki_word_setenvironment= 0x0000000d,
+ toki_word_nosetenvironment= 0x0000000e,
+ toki_word_suppressargs= 0x0000000f,
+ toki_word_nosuppressargs= 0x00000010,
+ toki_word_disconnecthup= 0x00000011,
+ toki_word_nodisconnecthup= 0x00000012,
+ toki_word_cd= 0x00000013,
+ toki_word_userrcfile= 0x00000014,
+ toki_word_include= 0x00000015,
+ toki_word_includeifexist= 0x00000016,
+ toki_word_includelookup= 0x00000017,
+ toki_word_includelookupall= 0x00000018,
+ toki_word_includedirectory= 0x00000019,
+ toki_word_message= 0x0000001a,
+ toki_word_includesysconfig= 0x0000001b,
+ toki_word_includeuserrcfile= 0x0000001c,
+ toki_word_includeclientconfig= 0x0000001d,
+ toki_word_quit= 0x0000001e,
+ toki_word_eof= 0x0000001f,
+ toki_word_if= 0x00000020,
+ toki_word_catchquit= 0x00000021,
+ toki_word_errorspush= 0x00000022,
+ toki_word_elif= 0x00000023,
+ toki_word_else= 0x00000024,
+ toki_word_fi= 0x00000025,
+ toki_word_hctac= 0x00000026,
+ toki_word_srorre= 0x00000027,
+ toki_word_glob= 0x00000028,
+ toki_word_range= 0x00000029,
+ toki_word_grep= 0x0000002a,
+ toki_word_environment= 0x0000002b,
+ toki_word_parameter= 0x0000002c,
+ toki_word_version= 0x0000002d,
+ toki_word_toplevel= 0x0000002e,
+ toki_word_override= 0x0000002f,
+ toki_word_reset= 0x00000030,
+ toki_word_execute= 0x00000031,
+ toki_word_help= 0x00000032,
+ toki_word_service= 0x00000033,
+ toki_word_callinguser= 0x00000034,
+ toki_word_callinggroup= 0x00000035,
+ toki_word_callingusershell= 0x00000036,
+ toki_word_serviceuser= 0x00000037,
+ toki_word_servicegroup= 0x00000038,
+ toki_word_serviceusershell= 0x00000039,
+ toki_syslog_debug= 0x0000003a,
+ toki_syslog_info= 0x0000003b,
+ toki_syslog_notice= 0x0000003c,
+ toki_syslog_warning= 0x0000003d,
+ toki_syslog_err= 0x0000003e,
+ toki_syslog_crit= 0x0000003f,
+ toki_syslog_alert= 0x00000040,
+ toki_syslog_emerg= 0x00000041,
+ toki_syslog_authpriv= 0x00000042,
+ toki_syslog_cron= 0x00000043,
+ toki_syslog_daemon= 0x00000044,
+ toki_syslog_kern= 0x00000045,
+ toki_syslog_lpr= 0x00000046,
+ toki_syslog_mail= 0x00000047,
+ toki_syslog_news= 0x00000048,
+ toki_syslog_syslog= 0x00000049,
+ toki_syslog_user= 0x0000004a,
+ toki_syslog_uucp= 0x0000004b,
+ toki_syslog_local0= 0x0000004c,
+ toki_syslog_local1= 0x0000004d,
+ toki_syslog_local2= 0x0000004e,
+ toki_syslog_local3= 0x0000004f,
+ toki_syslog_local4= 0x00000050,
+ toki_syslog_local5= 0x00000051,
+ toki_syslog_local6= 0x00000052,
+ toki_syslog_local7= 0x00000053,
+ toki_word_read= 0x00000054,
+ toki_word_write= 0x00000055,
+ toki_ordinal= 0x00000056,
+ toki_fdrange= 0x00000057,
+ toki_fdstoend= 0x00000058,
+ toki_dollar= 0x00000059,
+ toki_lwsp= 0x0000005a,
+ toki_newline= 0x0000005b,
+ toki_barestring= 0x0000005c,
+ toki_quotedstring= 0x0000005d,
+ toki_eof= 0x0000005e,
+ toki_quit= 0x0000005f,
+ toki_error= 0x00000060,
+ toki_openparen= 0x00000061,
+ toki_closeparen= 0x00000062,
+ toki_not= 0x00000063,
+ toki_and= 0x00000064,
+ toki_or= 0x00000065,
+ toki_word_error= 0x00000066,
+
+ tokv_word_reject= tokt_directive|tokt_execmode|tokr_word|toki_word_reject,
+ tokv_word_executefromdirectory=tokt_directive|tokt_execmode|tokr_word|toki_word_executefromdirectory,
+ tokv_word_executefrompath= tokt_directive|tokt_execmode|tokr_word|toki_word_executefrompath,
+ tokv_word_executebuiltin= tokt_directive|tokt_execmode|tokr_word|toki_word_executebuiltin,
+ tokv_word_errorstostderr= tokt_directive|tokt_ehandlemode|tokr_word|toki_word_errorstostderr,
+ tokv_word_errorstosyslog= tokt_directive|tokt_ehandlemode|tokr_word|toki_word_errorstosyslog,
+ tokv_word_errorstofile= tokt_directive|tokt_ehandlemode|tokr_word|toki_word_errorstofile,
+ tokv_word_requirefd= tokt_directive|tokr_word|toki_word_requirefd,
+ tokv_word_allowfd= tokt_directive|tokr_word|toki_word_allowfd,
+ tokv_word_nullfd= tokt_directive|tokr_word|toki_word_nullfd,
+ tokv_word_rejectfd= tokt_directive|tokr_word|toki_word_rejectfd,
+ tokv_word_ignorefd= tokt_directive|tokr_word|toki_word_ignorefd,
+ tokv_word_setenvironment= tokt_directive|tokr_word|toki_word_setenvironment,
+ tokv_word_nosetenvironment= tokt_directive|tokr_word|toki_word_nosetenvironment,
+ tokv_word_suppressargs= tokt_directive|tokr_word|toki_word_suppressargs,
+ tokv_word_nosuppressargs= tokt_directive|tokr_word|toki_word_nosuppressargs,
+ tokv_word_disconnecthup= tokt_directive|tokr_word|toki_word_disconnecthup,
+ tokv_word_nodisconnecthup= tokt_directive|tokr_word|toki_word_nodisconnecthup,
+ tokv_word_cd= tokt_directive|tokr_word|toki_word_cd,
+ tokv_word_userrcfile= tokt_directive|tokr_word|toki_word_userrcfile,
+ tokv_word_include= tokt_directive|tokr_word|toki_word_include,
+ tokv_word_includeifexist= tokt_directive|tokr_word|toki_word_includeifexist,
+ tokv_word_includelookup= tokt_directive|tokr_word|toki_word_includelookup,
+ tokv_word_includelookupall= tokt_directive|tokr_word|toki_word_includelookupall,
+ tokv_word_includedirectory= tokt_directive|tokr_word|toki_word_includedirectory,
+ tokv_word_message= tokt_directive|tokr_word|toki_word_message,
+ tokv_word_includesysconfig= tokt_directive|tokt_internal|tokr_word|toki_word_includesysconfig,
+ tokv_word_includeuserrcfile= tokt_directive|tokt_internal|tokr_word|toki_word_includeuserrcfile,
+ tokv_word_includeclientconfig=tokt_directive|tokt_internal|tokr_word|toki_word_includeclientconfig,
+ tokv_word_quit= tokt_directive|tokr_word|toki_word_quit,
+ tokv_word_eof= tokt_directive|tokr_word|toki_word_eof,
+ tokv_word_if= tokt_directive|tokt_controlstart|tokr_word|toki_word_if,
+ tokv_word_catchquit= tokt_directive|tokt_controlstart|tokr_word|toki_word_catchquit,
+ tokv_word_errorspush= tokt_directive|tokt_controlstart|tokr_word|toki_word_errorspush,
+ tokv_word_elif= tokt_controlend|tokt_controlstart|tokr_word|toki_word_elif,
+ tokv_word_else= tokt_controlend|tokt_controlstart|tokr_word|toki_word_else,
+ tokv_word_fi= tokt_controlend|tokr_word|toki_word_fi,
+ tokv_word_hctac= tokt_controlend|tokr_word|toki_word_hctac,
+ tokv_word_srorre= tokt_controlend|tokr_word|toki_word_srorre,
+ tokv_word_glob= tokt_parmcondition|tokr_word|toki_word_glob,
+ tokv_word_range= tokt_parmcondition|tokr_word|toki_word_range,
+ tokv_word_grep= tokt_parmcondition|tokr_word|toki_word_grep,
+ tokv_word_environment= tokt_builtinservice|tokr_word|toki_word_environment,
+ tokv_word_parameter= tokt_builtinservice|tokr_word|toki_word_parameter,
+ tokv_word_version= tokt_builtinservice|tokr_word|toki_word_version,
+ tokv_word_toplevel= tokt_builtinservice|tokr_word|toki_word_toplevel,
+ tokv_word_override= tokt_builtinservice|tokr_word|toki_word_override,
+ tokv_word_reset= tokt_builtinservice|tokt_directive|tokr_word|toki_word_reset,
+ tokv_word_execute= tokt_builtinservice|tokt_directive|tokt_execmode|tokr_word|toki_word_execute,
+ tokv_word_help= tokt_builtinservice|tokr_word|toki_word_help,
+ tokv_word_service= tokt_parameter|tokr_word|toki_word_service,
+ tokv_word_callinguser= tokt_parameter|tokr_word|toki_word_callinguser,
+ tokv_word_callinggroup= tokt_parameter|tokr_word|toki_word_callinggroup,
+ tokv_word_callingusershell= tokt_parameter|tokr_word|toki_word_callingusershell,
+ tokv_word_serviceuser= tokt_parameter|tokr_word|toki_word_serviceuser,
+ tokv_word_servicegroup= tokt_parameter|tokr_word|toki_word_servicegroup,
+ tokv_word_serviceusershell= tokt_parameter|tokr_word|toki_word_serviceusershell,
+ tokv_syslog_debug= tokt_loglevel|tokr_word|toki_syslog_debug,
+ tokv_syslog_info= tokt_loglevel|tokr_word|toki_syslog_info,
+ tokv_syslog_notice= tokt_loglevel|tokr_word|toki_syslog_notice,
+ tokv_syslog_warning= tokt_loglevel|tokr_word|toki_syslog_warning,
+ tokv_syslog_err= tokt_loglevel|tokr_word|toki_syslog_err,
+ tokv_syslog_crit= tokt_loglevel|tokr_word|toki_syslog_crit,
+ tokv_syslog_alert= tokt_loglevel|tokr_word|toki_syslog_alert,
+ tokv_syslog_emerg= tokt_loglevel|tokr_word|toki_syslog_emerg,
+ tokv_syslog_authpriv= tokt_logfacility|tokr_word|toki_syslog_authpriv,
+ tokv_syslog_cron= tokt_logfacility|tokr_word|toki_syslog_cron,
+ tokv_syslog_daemon= tokt_logfacility|tokr_word|toki_syslog_daemon,
+ tokv_syslog_kern= tokt_logfacility|tokr_word|toki_syslog_kern,
+ tokv_syslog_lpr= tokt_logfacility|tokr_word|toki_syslog_lpr,
+ tokv_syslog_mail= tokt_logfacility|tokr_word|toki_syslog_mail,
+ tokv_syslog_news= tokt_logfacility|tokr_word|toki_syslog_news,
+ tokv_syslog_syslog= tokt_logfacility|tokr_word|toki_syslog_syslog,
+ tokv_syslog_user= tokt_logfacility|tokr_word|toki_syslog_user,
+ tokv_syslog_uucp= tokt_logfacility|tokr_word|toki_syslog_uucp,
+ tokv_syslog_local0= tokt_logfacility|tokr_word|toki_syslog_local0,
+ tokv_syslog_local1= tokt_logfacility|tokr_word|toki_syslog_local1,
+ tokv_syslog_local2= tokt_logfacility|tokr_word|toki_syslog_local2,
+ tokv_syslog_local3= tokt_logfacility|tokr_word|toki_syslog_local3,
+ tokv_syslog_local4= tokt_logfacility|tokr_word|toki_syslog_local4,
+ tokv_syslog_local5= tokt_logfacility|tokr_word|toki_syslog_local5,
+ tokv_syslog_local6= tokt_logfacility|tokr_word|toki_syslog_local6,
+ tokv_syslog_local7= tokt_logfacility|tokr_word|toki_syslog_local7,
+ tokv_word_read= tokt_readwrite|tokr_word|toki_word_read,
+ tokv_word_write= tokt_readwrite|tokr_word|toki_word_write,
+ tokv_ordinal= tokt_number|tokt_fdrange|tokr_word|toki_ordinal,
+ tokv_fdrange= tokt_fdrange|tokr_punct|toki_fdrange,
+ tokv_fdstoend= tokt_fdrange|tokr_punct|toki_fdstoend,
+ tokv_dollar= tokt_misc|tokr_punct|toki_dollar,
+ tokv_lwsp= tokt_misc|tokr_nonstring|toki_lwsp,
+ tokv_newline= tokt_misc|tokr_nonstring|toki_newline,
+ tokv_barestring= tokt_string|tokr_string|toki_barestring,
+ tokv_quotedstring= tokt_string|tokr_string|toki_quotedstring,
+ tokv_eof= tokt_exception|tokr_nonstring|toki_eof,
+ tokv_quit= tokt_exception|tokr_nonstring|toki_quit,
+ tokv_error= tokt_exception|tokr_nonstring|toki_error,
+ tokv_openparen= tokt_condop|tokr_punct|toki_openparen,
+ tokv_closeparen= tokt_condop|tokr_punct|toki_closeparen,
+ tokv_not= tokt_condop|tokr_punct|toki_not,
+ tokv_and= tokt_condop|tokr_punct|toki_and,
+ tokv_or= tokt_condop|tokr_punct|toki_or,
+ tokv_word_error= tokt_directive|tokt_loglevel|tokr_word|toki_word_error,
+
+};
+
+#endif
+
~ian / userv.git / commitdiff