lexer.l

   1 /*
   2  *   Copyright (C)1996-1997,1999 Ian Jackson
   3  *
   4  *   This is free software; you can redistribute it and/or modify it
   5  *   under the terms of the GNU General Public License as published by
   6  *   the Free Software Foundation; either version 2 of the License, or
   7  *   (at your option) any later version.
   8  *
   9  *   This program is distributed in the hope that it will be useful, but
  10  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *   General Public License for more details.
  13  *
  14  *   You should have received a copy of the GNU General Public License
  15  *   along with userv; if not, write to the Free Software
  16  *   Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 %{
  20
  21
  22
  23
  24
  25 #include <syslog.h>
  26 #include <assert.h>
  27 #include <stdio.h>
  28 #include <stdarg.h>
  29 #include <ctype.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32 #include <pwd.h>
  33 #include <grp.h>
  34 #include <fnmatch.h>
  35 #include <limits.h>
  36 #include <dirent.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <time.h>
  40 #include <errno.h>
  41
  42 #include "config.h"
  43 #include "common.h"
  44 #include "daemon.h"
  45 #include "lib.h"
  46 #include "tokens.h"
  47
  48 #define HYPHEN '-'
  49
  50 typedef int directive_fnt(int dtoken);
  51 static directive_fnt df_reject, df_execute, df_executefrompath;
  52 static directive_fnt df_executefromdirectory, df_executebuiltin;
  53 static directive_fnt df_errorstostderr, df_errorstosyslog, df_errorstofile;
  54 static directive_fnt dfg_fdwant, dfg_setflag;
  55 static directive_fnt df_reset, df_cd, df_userrcfile, df_include;
  56 static directive_fnt df_includelookup, df_includedirectory;
  57 static directive_fnt df_message, df_error, df_quit, df_eof;
  58 static directive_fnt df_if, df_catchquit, df_errorspush;
  59 static directive_fnt dfi_includeuserrcfile, dfi_includeclientconfig;
  60 /* directive functions return:
  61  *  0 for success having scanned up to and including end of line but not beyond,
  62  *  or tokv_error or tokv_quit.
  63  * They expect to parse the whitespace before their parameters (if any).
  64  */
  65
  66 typedef int parmcondition_fnt(int ctoken, char *const *parmvalues, int *rtrue);
  67 static parmcondition_fnt pcf_glob, pcf_range, pcf_grep;
  68 /* all conditional functions return tokv_error for failure or 0 for success
  69  *  at parsing and testing, in which case *rtrue is set to 0 or 1.
  70  *  On success they have scanned up to and including the condition's
  71  *  terminating newline; the pcf_... functions expect to parse the whitespace
  72  *  between the parameter name and the condition's arguments.
  73  * Otherwise they return tokv_error.
  74  * The parameter-based conditionals take a list of parameter values
  75  * as obtained from the parameter functions and pa_parameter,
  76  * and do _not_ free it.
  77  */
  78
  79 typedef int parameter_fnt(int ptoken, char ***rvalues);
  80 static parameter_fnt pf_service;
  81 static parameter_fnt pf_callinguser, pf_serviceuser;
  82 static parameter_fnt pf_callinggroup, pf_servicegroup;
  83 static parameter_fnt pf_callingusershell, pf_serviceusershell;
  84 /* Parameter functions return tokv_error or 0 for success at parsing
  85  * and determining the value, in which case *rvalues is made to be
  86  * a mallocd null-terminated array of pointers to mallocd strings.
  87  * freeparm can be used to free such an array.
  88  */
  89
  90 typedef int builtinserviceparse_fnt(char ***rnewargs);
  91 static builtinserviceparse_fnt bispa_none, bispa_parameter;
  92 /* These parse the arguments to a builtin service, including the
  93  * newline at the end of the line.  *rnewargs will initially be
  94  * null, indicating that no arguments are to be set; the function
  95  * may store a mallocd array of mallocd strings in it,
  96  * containing the arguments it wishes to have set (null-pointer
  97  * terminated).
  98  */
  99
 100 static int yylex(void);
 101 /* Returns a token (which may be an eof or error exception) */
 102
 103 static directive_fnt *lr_dir;
 104 static parmcondition_fnt *lr_parmcond;
 105 static builtinserviceparse_fnt *lr_bispa;
 106 static builtinserviceexec_fnt *lr_bisexec;
 107 static parameter_fnt *lr_parameter;
 108 static int lr_loglevel, lr_logfacility, lr_min, lr_max, *lr_flag;
 109 static int lr_flagval, lr_controlend;
 110 static int lr_fdwant_readwrite; /* -1=never, 0=opt, 1=always */
 111
 112 /* Forward declarations of things used in lexer and parser */
 113
 114 struct parser_state {
 115   int lineno, reportlineno, notedreferer, isinternal;
 116   const char *filename;
 117   struct stat filestab;
 118   YY_BUFFER_STATE ybuf;
 119   struct parser_state *upstate;
 120 };
 121
 122 static struct parser_state *cstate;
 123
 124 struct error_handling {
 125   int handling; /* One of the error handling modes tokt_ehandlemode */
 126   int logfacility, loglevel;
 127   int filekeep; /* File is in use by higher-level errors-push, leave it open */
 128   FILE *file;
 129   char *filename;
 130 };
 131
 132 static struct error_handling eh = { tokv_word_errorstostderr, 0,0,0,0,0 };
 133
 134 static int dequote(char *inplace);
 135
 136 #define YY_NO_UNPUT
 137
 138 %}
 139
 140 %option noyywrap
 141
 142 %%
 143
 144 reject { lr_dir= df_reject; return tokv_word_reject; }
 145 execute-from-directory { lr_dir= df_executefromdirectory; return tokv_word_executefromdirectory; }
 146 execute-from-path { lr_dir= df_executefrompath; return tokv_word_executefrompath; }
 147 execute-builtin { lr_dir= df_executebuiltin; return tokv_word_executebuiltin; }
 148 errors-to-stderr { lr_dir= df_errorstostderr; return tokv_word_errorstostderr; }
 149 errors-to-syslog { lr_dir= df_errorstosyslog; return tokv_word_errorstosyslog; }
 150 errors-to-file { lr_dir= df_errorstofile; return tokv_word_errorstofile; }
 151 require-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=1; return tokv_word_requirefd; }
 152 allow-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=0; return tokv_word_allowfd; }
 153 null-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=0; return tokv_word_nullfd; }
 154 reject-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=-1; return tokv_word_rejectfd; }
 155 ignore-fd { lr_dir= dfg_fdwant; lr_fdwant_readwrite=-1; return tokv_word_ignorefd; }
 156 set-environment { lr_dir= dfg_setflag; lr_flag= &setenvironment; lr_flagval= 1; return tokv_word_setenvironment; }
 157 no-set-environment { lr_dir= dfg_setflag; lr_flag= &setenvironment; lr_flagval= 0; return tokv_word_nosetenvironment; }
 158 suppress-args { lr_dir= dfg_setflag; lr_flag= &suppressargs; lr_flagval= 1; return tokv_word_suppressargs; }
 159 no-suppress-args { lr_dir= dfg_setflag; lr_flag= &suppressargs; lr_flagval= 0; return tokv_word_nosuppressargs; }
 160 disconnect-hup { lr_dir= dfg_setflag; lr_flag= &disconnecthup; lr_flagval= 1; return tokv_word_disconnecthup; }
 161 no-disconnect-hup { lr_dir= dfg_setflag; lr_flag= &disconnecthup; lr_flagval= 0; return tokv_word_nodisconnecthup; }
 162 cd { lr_dir= df_cd; return tokv_word_cd; }
 163 user-rcfile { lr_dir= df_userrcfile; return tokv_word_userrcfile; }
 164 include { lr_dir= df_include; return tokv_word_include; }
 165 include-ifexist { lr_dir= df_include; return tokv_word_includeifexist; }
 166 include-lookup { lr_dir= df_includelookup; return tokv_word_includelookup; }
 167 include-lookup-all { lr_dir= df_includelookup; return tokv_word_includelookupall; }
 168 include-directory { lr_dir= df_includedirectory; return tokv_word_includedirectory; }
 169 message { lr_dir= df_message; return tokv_word_message; }
 170 _include-sysconfig { lr_dir= df_include; return tokv_word_includesysconfig; }
 171 _include-user-rcfile { lr_dir= dfi_includeuserrcfile; return tokv_word_includeuserrcfile; }
 172 _include-client-config { lr_dir= dfi_includeclientconfig; return tokv_word_includeclientconfig; }
 173 quit { lr_dir= df_quit; return tokv_word_quit; }
 174 eof { lr_dir= df_eof; return tokv_word_eof; }
 175 if { lr_dir= df_if; return tokv_word_if; }
 176 catch-quit { lr_dir= df_catchquit; return tokv_word_catchquit; }
 177 errors-push { lr_dir= df_errorspush; return tokv_word_errorspush; }
 178 elif { lr_controlend= tokv_word_if; return tokv_word_elif; }
 179 else { lr_controlend= tokv_word_if; return tokv_word_else; }
 180 fi { lr_controlend= tokv_word_if; return tokv_word_fi; }
 181 hctac { lr_controlend= tokv_word_catchquit; return tokv_word_hctac; }
 182 srorre { lr_controlend= tokv_word_errorspush; return tokv_word_srorre; }
 183 glob { lr_parmcond= pcf_glob; return tokv_word_glob; }
 184 range { lr_parmcond= pcf_range; return tokv_word_range; }
 185 grep { lr_parmcond= pcf_grep; return tokv_word_grep; }
 186 environment { lr_bispa= bispa_none; lr_bisexec= bisexec_environment; return tokv_word_environment; }
 187 parameter { lr_bispa= bispa_parameter; lr_bisexec= bisexec_parameter; return tokv_word_parameter; }
 188 version { lr_bispa= bispa_none; lr_bisexec= bisexec_version; return tokv_word_version; }
 189 toplevel { lr_bispa= bispa_none; lr_bisexec= bisexec_toplevel; return tokv_word_toplevel; }
 190 override { lr_bispa= bispa_none; lr_bisexec= bisexec_override; return tokv_word_override; }
 191 shutdown { lr_bispa= bispa_none; lr_bisexec= bisexec_shutdown; return tokv_word_shutdown; }
 192 reset { lr_bispa= bispa_none; lr_bisexec= bisexec_reset; lr_dir= df_reset; return tokv_word_reset; }
 193 execute { lr_bispa= bispa_none; lr_bisexec= bisexec_execute; lr_dir= df_execute; return tokv_word_execute; }
 194 help { lr_bispa= bispa_none; lr_bisexec= bisexec_help; return tokv_word_help; }
 195 service { lr_parameter= pf_service; return tokv_word_service; }
 196 calling-user { lr_parameter= pf_callinguser; return tokv_word_callinguser; }
 197 calling-group { lr_parameter= pf_callinggroup; return tokv_word_callinggroup; }
 198 calling-user-shell { lr_parameter= pf_callingusershell; return tokv_word_callingusershell; }
 199 service-user { lr_parameter= pf_serviceuser; return tokv_word_serviceuser; }
 200 service-group { lr_parameter= pf_servicegroup; return tokv_word_servicegroup; }
 201 service-user-shell { lr_parameter= pf_serviceusershell; return tokv_word_serviceusershell; }
 202 debug { lr_loglevel= LOG_DEBUG; return tokv_syslog_debug; }
 203 info { lr_loglevel= LOG_INFO; return tokv_syslog_info; }
 204 notice { lr_loglevel= LOG_NOTICE; return tokv_syslog_notice; }
 205 warn(ing)? { lr_loglevel= LOG_WARNING; return tokv_syslog_warning; }
 206 err { lr_loglevel= LOG_ERR; return tokv_syslog_err; }
 207 crit { lr_loglevel= LOG_CRIT; return tokv_syslog_crit; }
 208 alert { lr_loglevel= LOG_ALERT; return tokv_syslog_alert; }
 209 emerg|panic { lr_loglevel= LOG_EMERG; return tokv_syslog_emerg; }
 210 auth(priv)?|security { lr_logfacility= LOG_AUTHPRIV; return tokv_syslog_authpriv; }
 211 cron { lr_logfacility= LOG_CRON; return tokv_syslog_cron; }
 212 daemon { lr_logfacility= LOG_DAEMON; return tokv_syslog_daemon; }
 213 kern(el)? { lr_logfacility= LOG_KERN; return tokv_syslog_kern; }
 214 lpr { lr_logfacility= LOG_LPR; return tokv_syslog_lpr; }
 215 mail { lr_logfacility= LOG_MAIL; return tokv_syslog_mail; }
 216 news { lr_logfacility= LOG_NEWS; return tokv_syslog_news; }
 217 syslog { lr_logfacility= LOG_SYSLOG; return tokv_syslog_syslog; }
 218 user { lr_logfacility= LOG_USER; return tokv_syslog_user; }
 219 uucp { lr_logfacility= LOG_UUCP; return tokv_syslog_uucp; }
 220 local0 { lr_logfacility= LOG_LOCAL0; return tokv_syslog_local0; }
 221 local1 { lr_logfacility= LOG_LOCAL1; return tokv_syslog_local1; }
 222 local2 { lr_logfacility= LOG_LOCAL2; return tokv_syslog_local2; }
 223 local3 { lr_logfacility= LOG_LOCAL3; return tokv_syslog_local3; }
 224 local4 { lr_logfacility= LOG_LOCAL4; return tokv_syslog_local4; }
 225 local5 { lr_logfacility= LOG_LOCAL5; return tokv_syslog_local5; }
 226 local6 { lr_logfacility= LOG_LOCAL6; return tokv_syslog_local6; }
 227 local7 { lr_logfacility= LOG_LOCAL7; return tokv_syslog_local7; }
 228 read { return tokv_word_read; }
 229 write { return tokv_word_write; }
 230 \$ { return tokv_dollar; }
 231 \( { return tokv_openparen; }
 232 \) { return tokv_closeparen; }
 233 \! { return tokv_not; }
 234 \& { return tokv_and; }
 235 \| { return tokv_or; }
 236 error { lr_dir= df_error; lr_loglevel= LOG_ERR; return tokv_word_error; }
 237
 238
 239
 240 [0-9]{1,8}              {
 241                           char *ep;
 242                           lr_min=lr_max= (int)strtoul(yytext,&ep,10);
 243                           assert(!*ep);
 244                           return tokv_ordinal;
 245                         }
 246 [0-9]{1,8}-[0-9]{1,8}   {
 247                           char *ep;
 248                           lr_min= (int)strtoul(yytext,&ep,10);
 249                           assert(*ep == HYPHEN);
 250                           assert(*++ep);
 251                           lr_max= (int)strtoul(ep,&ep,10);
 252                           assert(!*ep);
 253                           if (lr_max < lr_min) {
 254                             parseerrprint("fd range has min > max");
 255                             return tokv_error;
 256                           }
 257                           return tokv_fdrange;
 258                         }
 259 [0-9]{1,8}-             {
 260                           char *ep;
 261                           lr_min= (int)strtoul(yytext,&ep,10);
 262                           assert(*ep == HYPHEN);
 263                           assert(!*++ep);
 264                           lr_max=-1;
 265                           return tokv_fdstoend;
 266                         }
 267 ([\ \t]*\\[\ \t]*\n[\ \t]*)+    return tokv_lwsp;
 268 [\ \t]+                         return tokv_lwsp;
 269 [\ \t]*\n               cstate->lineno++; return tokv_newline;
 270 [\ \t]*\#[^\n]*\n       cstate->lineno++; return tokv_newline;
 271 [\ \t]*\#[^\n]*         {
 272                           parseerrprint("missing newline at eof after comment");
 273                           return tokv_error;
 274                         }
 275 \"([^\\\"\n]|\\[a-z]|\\[0-9]{3}|\\x[0-9A-Fa-f]{2}|\\[[:punct:]]|\\[ \t]*\n)*\" {
 276                           return dequote(yytext);
 277                         }
 278 \".*                    {
 279                           parseerrprint("misquoted or unterminated string");
 280                           return tokv_error;
 281                         }
 282 [^\ \t\n\\]+            return tokv_barestring;
 283 <<EOF>>                 return tokv_eof;
 284
 285
 286 %%
 287
 288 const char *const builtinservicehelpstrings[]= {
 289   "environment",
 290   "parameter <parameter>",
 291   "version",
 292   "toplevel",
 293   "override",
 294   "shutdown",
 295   "reset",
 296   "execute",
 297   "help",
 298    0
 299 };
 300
 301 #include "parser.c"
 302