/[imapfilter]/imapfilter/parse.c
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Annotation of /imapfilter/parse.c

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Revision 1.9 - (hide annotations)
Mon Feb 9 17:34:56 2004 UTC (20 years, 1 month ago) by lefcha
Branch: MAIN
Changes since 1.8: +3 -9 lines
File MIME type: text/plain
Move DEBUG from compilation #define variable to runtime command line option.

1 lefcha 1.1 #include <stdio.h>
2 lefcha 1.3 #include <stdlib.h>
3 lefcha 1.1 #include <string.h>
4 lefcha 1.5 #include <strings.h>
5     #include <errno.h>
6 lefcha 1.1 #include <limits.h>
7     #include <sys/stat.h>
8 lefcha 1.6 #include <sys/types.h> /* IEEE Std 1003.1-2001 non-conformance. */
9 lefcha 1.5 #include <regex.h>
10 lefcha 1.1
11     #include "config.h"
12     #include "imapfilter.h"
13     #include "pathnames.h"
14    
15    
16     extern char logfile[PATH_MAX];
17     extern unsigned int options;
18     extern char charset[CHARSET_LEN];
19     extern unsigned int flags;
20     extern unsigned int interval;
21     extern long timeout;
22     extern char *home;
23    
24     #ifdef ENCRYPTED_PASSWORDS
25     char *passphr = NULL; /* Master password to access the passwords
26     * file. */
27     #endif
28    
29    
30     int parse_config(FILE * fd);
31     void set_options(char *line, regmatch_t * match);
32    
33     int parse_passwords(FILE * fd);
34    
35    
36     /*
37     * Find the path to configuration file, open it and call parse_config().
38     */
39     int
40     read_config(char *cfg)
41     {
42     int r;
43     FILE *fd;
44     char *c;
45    
46     c = NULL;
47    
48     if (cfg == NULL) {
49     cfg = c = (char *)xmalloc(PATH_MAX * sizeof(char));
50     snprintf(cfg, PATH_MAX, "%s/%s", home, PATHNAME_CONFIG_FILE);
51     }
52 lefcha 1.9 debug("configuration file: '%s'\n", cfg);
53 lefcha 1.8
54 lefcha 1.1 fd = fopen(cfg, "r");
55     if (fd == NULL)
56     fatal(ERROR_FILE_OPEN, "opening config file %s; %s\n", cfg,
57     strerror(errno));
58    
59     if (c != NULL)
60     xfree(c);
61    
62     if ((r = parse_config(fd)))
63     fatal(ERROR_CONFIG_PARSE,
64     "parse error in config file at row %d\n", r);
65    
66     fclose(fd);
67    
68 lefcha 1.8 check_file_perms(cfg, S_IRUSR | S_IWUSR);
69    
70 lefcha 1.9 debug("options: %0#10x '%s'\n", options, charset);
71 lefcha 1.1
72     return 0;
73     }
74    
75    
76     /*
77     * Parse configuration file.
78     */
79     int
80     parse_config(FILE * fd)
81     {
82     int i, r;
83     unsigned int row;
84     char line[LINE_MAX];
85     regex_t creg[13];
86     regmatch_t match[11];
87     const char *reg[13] = {
88     "^([[:blank:]]*\n|#.*\n)$",
89    
90     "^[[:blank:]]*ACCOUNT[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
91     "(([[:graph:]]+):([[:graph:]]*)|([[:graph:]]+))@"
92     "([[:alnum:].-]+)(:[[:digit:]]+)?[[:blank:]]*"
93     "([[:blank:]]SSL2|[[:blank:]]SSL3|[[:blank:]]TLS1)?"
94     "[[:blank:]]*\n$",
95    
96     "^[[:blank:]]*FOLDER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
97     "([[:print:]]+)[[:blank:]]*\n$",
98    
99     "^[[:blank:]]*FILTER[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]*"
100     "([[:blank:]]OR|[[:blank:]]AND)?[[:blank:]]*\n$",
101    
102     "^[[:blank:]]*ACTION[[:blank:]]+(DELETE|"
103     "COPY[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)|"
104     "MOVE[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)|"
105     "RCOPY[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
106     "(\"[[:print:]]*\"|[[:graph:]]+)|"
107     "RMOVE[[:blank:]]+([[:alnum:]_-]+)[[:blank:]]+"
108     "(\"[[:print:]]*\"|[[:graph:]]+)|"
109     "FLAG[[:blank:]]+(REPLACE|ADD|REMOVE)[[:blank:]]+"
110     "([[:alpha:],]+)|"
111     "LIST)[[:blank:]]*([[:graph:]]*)[[:blank:]]*\n$",
112    
113     "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
114     "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
115     "(ANSWERED|DELETED|DRAFT|FLAGGED|NEW|OLD|RECENT|SEEN|"
116     "UNANSWERED|UNDELETED|UNDRAFT|UNFLAGGED|UNSEEN)[[:blank:]]*\n$",
117    
118     "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
119     "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
120     "(BCC|BODY|CC|FROM|SUBJECT|TEXT|TO)[[:blank:]]+"
121     "(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$",
122    
123     "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
124     "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
125     "(HEADER)[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)"
126     "[[:blank:]]+(\"[[:print:]]*\"|[[:graph:]]+)[[:blank:]]*\n$",
127    
128     "^[[:blank:]]*(MASK[[:blank:]])?[[:blank:]]*(OR[[:blank:]]|"
129     "AND[[:blank:]])?[[:blank:]]*(NOT[[:blank:]])?[[:blank:]]*"
130     "(LARGER|SMALLER|OLDER|NEWER)[[:blank:]]+([[:digit:]]+)"
131     "[[:blank:]]*\n$",
132    
133     "^[[:blank:]]*JOB[[:blank:]]+([[:alnum:],_-]+)[[:blank:]]+"
134     "([[:alnum:],_-]+)[[:blank:]]*\n$",
135    
136     "^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(LOGFILE|CHARSET)"
137     "[[:blank:]]*=[[:blank:]]*(\"[[:print:]]*\"|[[:graph:]]+)"
138     "[[:blank:]]*\n$",
139    
140     "^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(ERRORS|EXPUNGE|"
141 lefcha 1.8 "HEADERS|NAMESPACE|PEEK|PERMISSIONS|PROTOCOL|SUBSCRIBE)"
142     "[[:blank:]]*=[[:blank:]]*(YES|NO)[[:blank:]]*\n$",
143 lefcha 1.1
144     "^[[:blank:]]*(SET[[:blank:]])?[[:blank:]]*(DAEMON|TIMEOUT)"
145     "[[:blank:]]*=[[:blank:]]*([[:digit:]]+)\n$"
146     };
147    
148     r = row = 0;
149    
150     for (i = 0; i < 13; i++)
151     regcomp(&creg[i], reg[i], REG_EXTENDED | REG_ICASE);
152    
153     /* First process all the variables. This is done because some
154     * variables' arguments are used before the other commands are
155     * processed. */
156     while (fgets(line, LINE_MAX - 1, fd))
157     if (!regexec(&creg[10], line, 4, match, 0) ||
158     !regexec(&creg[11], line, 4, match, 0) ||
159     !regexec(&creg[12], line, 4, match, 0))
160     set_options(line, match);
161    
162     /* Then rewind and process everything else. */
163     fseek(fd, 0L, SEEK_SET);
164     while (fgets(line, LINE_MAX - 1, fd)) {
165     row++;
166     if (!regexec(&creg[0], line, 0, match, 0))
167     continue;
168     else if (!regexec(&creg[1], line, 9, match, 0))
169     set_account(line, match);
170     else if (!regexec(&creg[2], line, 3, match, 0))
171     r = set_mboxgrp(line, match);
172     else if (!regexec(&creg[3], line, 3, match, 0))
173     r = set_filter(line, match);
174     else if (!regexec(&creg[4], line, 11, match, 0))
175     r = set_action(line, match);
176     else if (!regexec(&creg[5], line, 5, match, 0))
177     r = set_mask(line, match, MASK_MATCH_1);
178     else if (!regexec(&creg[6], line, 6, match, 0))
179     r = set_mask(line, match, MASK_MATCH_2);
180     else if (!regexec(&creg[7], line, 7, match, 0))
181     r = set_mask(line, match, MASK_MATCH_3);
182     else if (!regexec(&creg[8], line, 6, match, 0))
183     r = set_mask(line, match, MASK_MATCH_4);
184     else if (!regexec(&creg[9], line, 3, match, 0))
185     r = set_job(line, match);
186     /* Skip variable processing. */
187     else if (!regexec(&creg[10], line, 4, match, 0) ||
188     !regexec(&creg[11], line, 4, match, 0) ||
189     !regexec(&creg[12], line, 4, match, 0));
190     else
191     return row;
192    
193     if (r == ERROR_CONFIG_PARSE)
194     return row;
195     }
196    
197     for (i = 0; i < 13; i++)
198     regfree(&creg[i]);
199    
200     destroy_unneeded();
201    
202     return 0;
203     }
204    
205    
206     /*
207 lefcha 1.4 * Signal SIGUSR1 received, destroy all data structures and reread the
208 lefcha 1.1 * configuration file.
209     */
210     void
211     reread_config(char *cfg)
212     {
213     destroy_all();
214     read_config(cfg);
215 lefcha 1.2 #ifdef ENCRYPTED_PASSWORDS
216 lefcha 1.1 read_passwords();
217 lefcha 1.2 #endif
218 lefcha 1.4 flags &= ~(FLAG_SIGUSR1_RECEIVED);
219 lefcha 1.1 }
220    
221    
222     /*
223     * Set other options found in config file.
224     */
225     void
226     set_options(char *line, regmatch_t * m)
227     {
228     if (!strncasecmp(line + m[2].rm_so, "logfile", 7)) {
229     if (*logfile == '\0') {
230     if (*(line + m[3].rm_so) == '"' &&
231     *(line + m[3].rm_eo - 1) == '"')
232     strncat(logfile, line + m[3].rm_so + 1,
233     min((m[3].rm_eo - m[3].rm_so - 2),
234     PATH_MAX - 1));
235     else
236     strncat(logfile, line + m[3].rm_so,
237     min((m[3].rm_eo - m[3].rm_so),
238     PATH_MAX - 1));
239     }
240     } else if (!strncasecmp(line + m[2].rm_so, "charset", 7)) {
241     if (*(line + m[3].rm_so) == '"' &&
242     *(line + m[3].rm_eo - 1) == '"')
243     strncat(charset, line + m[3].rm_so + 1,
244     min((m[3].rm_eo - m[3].rm_so - 2),
245     CHARSET_LEN - 1));
246     else
247     strncat(charset, line + m[3].rm_so,
248     min((m[3].rm_eo - m[3].rm_so), CHARSET_LEN - 1));
249     } else if (!strncasecmp(line + m[2].rm_so, "errors", 6)) {
250     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
251     options |= OPTION_ERRORS;
252     else
253     options &= ~(OPTION_ERRORS);
254     } else if (!strncasecmp(line + m[2].rm_so, "expunge", 7)) {
255     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
256     options |= OPTION_EXPUNGE;
257     else
258     options &= ~(OPTION_EXPUNGE);
259     } else if (!strncasecmp(line + m[2].rm_so, "header", 6)) {
260     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
261     options |= OPTION_HEADERS;
262     else
263     options &= ~(OPTION_HEADERS);
264     } else if (!strncasecmp(line + m[2].rm_so, "namespace", 9)) {
265     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
266     options |= OPTION_NAMESPACE;
267     else
268     options &= ~(OPTION_NAMESPACE);
269 lefcha 1.7 } else if (!strncasecmp(line + m[2].rm_so, "peek", 4)) {
270     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
271     options |= OPTION_PEEK;
272     else
273     options &= ~(OPTION_PEEK);
274 lefcha 1.8 } else if (!strncasecmp(line + m[2].rm_so, "permissions", 8)) {
275     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
276     options |= OPTION_PERMISSIONS;
277     else
278     options &= ~(OPTION_PERMISSIONS);
279 lefcha 1.1 } else if (!strncasecmp(line + m[2].rm_so, "subscribe", 9)) {
280     if (!strncasecmp(line + m[3].rm_so, "yes", 3))
281     options |= OPTION_SUBSCRIBE;
282     else
283     options &= ~(OPTION_SUBSCRIBE);
284     } else if (!strncasecmp(line + m[2].rm_so, "timeout", 7)) {
285     errno = 0;
286     timeout = strtol(line + m[3].rm_so, NULL, 10);
287     if (errno)
288     timeout = 0;
289     } else if (!strncasecmp(line + m[2].rm_so, "daemon", 6) &&
290     !(options & OPTION_DAEMON_MODE)) {
291     options |= OPTION_DAEMON_MODE;
292     errno = 0;
293     interval = strtoul(line + m[3].rm_so, NULL, 10);
294     if (errno)
295     interval = 0;
296     }
297     }
298    
299    
300     #ifdef ENCRYPTED_PASSWORDS
301     /*
302     * Open password file and call parse_passwords().
303     */
304     int
305     read_passwords(void)
306     {
307     FILE *fd;
308     char pwfile[PATH_MAX];
309    
310     if (!(flags & FLAG_BLANK_PASSWORD))
311     return ERROR_CONFIG_PARSE;
312    
313     if (!passphr) {
314     passphr = (char *)smalloc(PASSPHRASE_LEN);
315     *passphr = '\0';
316     }
317     snprintf(pwfile, PATH_MAX, "%s/%s", home, PATHNAME_PASSWORD_FILE);
318 lefcha 1.9 debug("passwords file: '%s'\n", pwfile);
319 lefcha 1.1
320     if (!exists_file(pwfile))
321     return ERROR_FILE_OPEN;
322    
323     check_file_perms(pwfile, S_IRUSR | S_IWUSR);
324    
325     fd = fopen(pwfile, "r");
326     if (fd == NULL)
327     fatal(ERROR_FILE_OPEN, "opening passwords file %s; %s\n",
328     pwfile, strerror(errno));
329    
330     parse_passwords(fd);
331    
332     fclose(fd);
333    
334     return 0;
335     }
336    
337    
338     /*
339     * Parse unencrypted password file.
340     */
341     int
342     parse_passwords(FILE * fd)
343     {
344     int t;
345     char *pe;
346     char user[USERNAME_LEN], serv[SERVER_LEN];
347     unsigned char *buf;
348     char *c, *cp, *line;
349     regex_t creg;
350     regmatch_t match[4];
351     const char *reg;
352    
353     t = 3;
354     pe = NULL;
355     reg = "([[:alnum:].-]+) ([[:graph:]]+) ([[:graph:]]+)";
356    
357     if (!(flags & FLAG_DAEMON_MODE)) {
358     do {
359     fseek(fd, 0L, SEEK_SET);
360     printf("Enter master passphrase: ");
361     get_password(passphr, PASSPHRASE_LEN);
362     } while (decrypt_passwords(&buf, fd) && --t != 0);
363    
364     if (!t)
365     return ERROR_PASSPHRASE;
366     } else if (decrypt_passwords(&buf, fd))
367     fatal(ERROR_DECRYPT,
368     "failed decrypting passwords in daemon mode\n");
369    
370     c = cp = sstrdup(buf);
371    
372     regcomp(&creg, reg, REG_EXTENDED | REG_ICASE);
373    
374     line = strtok_r(c, "\n", &c);
375     while (line != NULL && !regexec(&creg, line, 4, match, 0)) {
376     user[0] = serv[0] = '\0';
377    
378     strncat(serv, line + match[1].rm_so,
379     min(match[1].rm_eo - match[1].rm_so, SERVER_LEN - 1));
380     strncat(user, line + match[2].rm_so,
381     min(match[2].rm_eo - match[2].rm_so, USERNAME_LEN - 1));
382    
383     if ((pe = (char *)find_password(user, serv)))
384     strncat(pe, line + match[3].rm_so,
385     min(match[3].rm_eo - match[3].rm_so,
386     PASSWORD_LEN - 1));
387    
388     line = strtok_r(NULL, "\n", &c);
389     }
390    
391     regfree(&creg);
392     sfree(cp);
393     sfree(buf);
394    
395     return 0;
396     }
397     #endif /* ENCRYPTED_PASSWORDS */

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