2 dnl lexer, passed through m4 with defs from langauge.i4
4 * Copyright (C)1996-1997,1999 Ian Jackson
6 * This is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with userv; if not, write to the Free Software
18 * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 #include <sys/types.h>
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).
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.
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.
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
100 static int yylex(void);
101 /* Returns a token (which may be an eof or error exception) */
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 */
112 /* Forward declarations of things used in lexer and parser */
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;
122 static struct parser_state *cstate;
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 */
132 static struct error_handling eh = { tokv_word_errorstostderr, 0,0,0,0,0 };
134 static int dequote(char *inplace);
135 static void countnewlines(void);
151 lr_min=lr_max= (int)strtoul(yytext,&ep,10);
155 [0-9]{1,8}-[0-9]{1,8} {
157 lr_min= (int)strtoul(yytext,&ep,10);
158 assert(*ep == HYPHEN);
160 lr_max= (int)strtoul(ep,&ep,10);
163 return parseerrprint("fd range has min > max");
168 lr_min= (int)strtoul(yytext,&ep,10);
169 assert(*ep == HYPHEN);
172 return tokv_fdstoend;
174 ([\ \t]*\\[\ \t]*\n[\ \t]*)+ countnewlines(); return tokv_lwsp;
175 [\ \t]+ return tokv_lwsp;
176 [\ \t]*\n cstate->lineno++; return tokv_newline;
177 [\ \t]*\#[^\n]*\n cstate->lineno++; return tokv_newline;
178 [\ \t]*\#[^\n]* return parseerrprint("missing newline at eof after comment");
179 \"([^\\\"\n]|\\[a-z]|\\[0-9]{3}|\\x[0-9A-Fa-f]{2}|\\[[:punct:]]|\\[ \t]*\n)*\" {
181 return dequote(yytext);
183 [^\ \t\n\\\"]+ return tokv_barestring;
184 <<EOF>> return tokv_eof;
185 \" return parseerrprint("misquoted or unterminated string");
186 \\ return parseerrprint("unexpected backslash");
187 . abort(); /* expect lex warning "rule cannot be matched" */
192 const char *const builtinservicehelpstrings[]= {