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Tomato 1.28
[tomato.git] / release / src / router / busybox / miscutils / crond.c
blob804fe0b292f0f1bf21eaad16048ce75da27fa844
1 /* vi: set sw=4 ts=4: */
2 /*
3 * crond -d[#] -c <crondir> -f -b
4 *
5 * run as root, but NOT setuid root
6 *
7 * Copyright 1994 Matthew Dillon (dillon@apollo.west.oic.com)
8 * (version 2.3.2)
9 * Vladimir Oleynik <dzo@simtreas.ru> (C) 2002
10 *
11 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
12 */
13
14 #include "libbb.h"
15 #include <syslog.h>
16
17 /* glibc frees previous setenv'ed value when we do next setenv()
18 * of the same variable. uclibc does not do this! */
19 #if (defined(__GLIBC__) && !defined(__UCLIBC__)) /* || OTHER_SAFE_LIBC... */
20 #define SETENV_LEAKS 0
21 #else
22 #define SETENV_LEAKS 1
23 #endif
24
25
26 #define TMPDIR CONFIG_FEATURE_CROND_DIR
27 #define CRONTABS CONFIG_FEATURE_CROND_DIR "/crontabs"
28 #ifndef SENDMAIL
29 #define SENDMAIL "sendmail"
30 #endif
31 #ifndef SENDMAIL_ARGS
32 #define SENDMAIL_ARGS "-ti", "oem"
33 #endif
34 #ifndef CRONUPDATE
35 #define CRONUPDATE "cron.update"
36 #endif
37 #ifndef MAXLINES
38 #define MAXLINES 256 /* max lines in non-root crontabs */
39 #endif
40
41
42 typedef struct CronFile {
43 struct CronFile *cf_Next;
44 struct CronLine *cf_LineBase;
45 char *cf_User; /* username */
46 smallint cf_Ready; /* bool: one or more jobs ready */
47 smallint cf_Running; /* bool: one or more jobs running */
48 smallint cf_Deleted; /* marked for deletion, ignore */
49 } CronFile;
50
51 typedef struct CronLine {
52 struct CronLine *cl_Next;
53 char *cl_Shell; /* shell command */
54 pid_t cl_Pid; /* running pid, 0, or armed (-1) */
55 #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
56 int cl_MailPos; /* 'empty file' size */
57 smallint cl_MailFlag; /* running pid is for mail */
58 char *cl_MailTo; /* whom to mail results */
59 #endif
60 /* ordered by size, not in natural order. makes code smaller: */
61 char cl_Dow[7]; /* 0-6, beginning sunday */
62 char cl_Mons[12]; /* 0-11 */
63 char cl_Hrs[24]; /* 0-23 */
64 char cl_Days[32]; /* 1-31 */
65 char cl_Mins[60]; /* 0-59 */
66 } CronLine;
67
68
69 #define DaemonUid 0
70
71
72 enum {
73 OPT_l = (1 << 0),
74 OPT_L = (1 << 1),
75 OPT_f = (1 << 2),
76 OPT_b = (1 << 3),
77 OPT_S = (1 << 4),
78 OPT_c = (1 << 5),
79 OPT_d = (1 << 6) * ENABLE_FEATURE_CROND_D,
80 };
81 #if ENABLE_FEATURE_CROND_D
82 #define DebugOpt (option_mask32 & OPT_d)
83 #else
84 #define DebugOpt 0
85 #endif
86
87
88 struct globals {
89 unsigned LogLevel; /* = 8; */
90 const char *LogFile;
91 const char *CDir; /* = CRONTABS; */
92 CronFile *FileBase;
93 #if SETENV_LEAKS
94 char *env_var_user;
95 char *env_var_home;
96 #endif
97 };
98 #define G (*(struct globals*)&bb_common_bufsiz1)
99 #define LogLevel (G.LogLevel )
100 #define LogFile (G.LogFile )
101 #define CDir (G.CDir )
102 #define FileBase (G.FileBase )
103 #define env_var_user (G.env_var_user )
104 #define env_var_home (G.env_var_home )
105 #define INIT_G() do { \
106 LogLevel = 8; \
107 CDir = CRONTABS; \
108 } while (0)
109
110
111 static void CheckUpdates(void);
112 static void SynchronizeDir(void);
113 static int TestJobs(time_t t1, time_t t2);
114 static void RunJobs(void);
115 static int CheckJobs(void);
116 static void RunJob(const char *user, CronLine *line);
117 #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
118 static void EndJob(const char *user, CronLine *line);
119 #else
120 #define EndJob(user, line) ((line)->cl_Pid = 0)
121 #endif
122 static void DeleteFile(const char *userName);
123
124
125 #define LVL5 "\x05"
126 #define LVL7 "\x07"
127 #define LVL8 "\x08"
128 #define LVL9 "\x09"
129 #define WARN9 "\x49"
130 #define DIE9 "\xc9"
131 /* level >= 20 is "error" */
132 #define ERR20 "\x14"
133
134 static void crondlog(const char *ctl, ...)
135 {
136 va_list va;
137 int level = (ctl[0] & 0x1f);
138
139 va_start(va, ctl);
140 if (level >= (int)LogLevel) {
141 /* Debug mode: all to (non-redirected) stderr, */
142 /* Syslog mode: all to syslog (logmode = LOGMODE_SYSLOG), */
143 if (!DebugOpt && LogFile) {
144 /* Otherwise (log to file): we reopen log file at every write: */
145 int logfd = open3_or_warn(LogFile, O_WRONLY | O_CREAT | O_APPEND, 0666);
146 if (logfd >= 0)
147 xmove_fd(logfd, STDERR_FILENO);
148 }
149 // TODO: ERR -> error, WARN -> warning, LVL -> info
150 bb_verror_msg(ctl + 1, va, /* strerr: */ NULL);
151 }
152 va_end(va);
153 if (ctl[0] & 0x80)
154 exit(20);
155 }
156
157 int crond_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
158 int crond_main(int argc UNUSED_PARAM, char **argv)
159 {
160 unsigned opt;
161
162 INIT_G();
163
164 /* "-b after -f is ignored", and so on for every pair a-b */
165 opt_complementary = "f-b:b-f:S-L:L-S" USE_FEATURE_CROND_D(":d-l")
166 ":l+:d+"; /* -l and -d have numeric param */
167 opt = getopt32(argv, "l:L:fbSc:" USE_FEATURE_CROND_D("d:"),
168 &LogLevel, &LogFile, &CDir
169 USE_FEATURE_CROND_D(,&LogLevel));
170 /* both -d N and -l N set the same variable: LogLevel */
171
172 if (!(opt & OPT_f)) {
173 /* close stdin, stdout, stderr.
174 * close unused descriptors - don't need them. */
175 bb_daemonize_or_rexec(DAEMON_CLOSE_EXTRA_FDS, argv);
176 }
177
178 if (!DebugOpt && LogFile == NULL) {
179 /* logging to syslog */
180 openlog(applet_name, LOG_CONS | LOG_PID, LOG_CRON);
181 logmode = LOGMODE_SYSLOG;
182 }
183
184 xchdir(CDir);
185 //signal(SIGHUP, SIG_IGN); /* ? original crond dies on HUP... */
186 xsetenv("SHELL", DEFAULT_SHELL); /* once, for all future children */
187 crondlog(LVL9 "crond (busybox "BB_VER") started, log level %d", LogLevel);
188 SynchronizeDir();
189
190 /* main loop - synchronize to 1 second after the minute, minimum sleep
191 * of 1 second. */
192 {
193 time_t t1 = time(NULL);
194 time_t t2;
195 long dt;
196 int rescan = 60;
197 int sleep_time = 60;
198
199 write_pidfile("/var/run/crond.pid");
200 for (;;) {
201 sleep((sleep_time + 1) - (time(NULL) % sleep_time));
202
203 t2 = time(NULL);
204 dt = (long)t2 - (long)t1;
205
206 /*
207 * The file 'cron.update' is checked to determine new cron
208 * jobs. The directory is rescanned once an hour to deal
209 * with any screwups.
210 *
211 * check for disparity. Disparities over an hour either way
212 * result in resynchronization. A reverse-indexed disparity
213 * less then an hour causes us to effectively sleep until we
214 * match the original time (i.e. no re-execution of jobs that
215 * have just been run). A forward-indexed disparity less then
216 * an hour causes intermediate jobs to be run, but only once
217 * in the worst case.
218 *
219 * when running jobs, the inequality used is greater but not
220 * equal to t1, and less then or equal to t2.
221 */
222 if (--rescan == 0) {
223 rescan = 60;
224 SynchronizeDir();
225 }
226 CheckUpdates();
227 if (DebugOpt)
228 crondlog(LVL5 "wakeup dt=%ld", dt);
229 if (dt < -60 * 60 || dt > 60 * 60) {
230 crondlog(WARN9 "time disparity of %d minutes detected", dt / 60);
231 } else if (dt > 0) {
232 TestJobs(t1, t2);
233 RunJobs();
234 sleep(5);
235 if (CheckJobs() > 0) {
236 sleep_time = 10;
237 } else {
238 sleep_time = 60;
239 }
240 }
241 t1 = t2;
242 }
243 }
244 return 0; /* not reached */
245 }
246
247 #if SETENV_LEAKS
248 /* We set environment *before* vfork (because we want to use vfork),
249 * so we cannot use setenv() - repeated calls to setenv() may leak memory!
250 * Using putenv(), and freeing memory after unsetenv() won't leak */
251 static void safe_setenv(char **pvar_val, const char *var, const char *val)
252 {
253 char *var_val = *pvar_val;
254
255 if (var_val) {
256 bb_unsetenv(var_val);
257 free(var_val);
258 }
259 *pvar_val = xasprintf("%s=%s", var, val);
260 putenv(*pvar_val);
261 }
262 #endif
263
264 static void SetEnv(struct passwd *pas)
265 {
266 #if SETENV_LEAKS
267 safe_setenv(&env_var_user, "USER", pas->pw_name);
268 safe_setenv(&env_var_home, "HOME", pas->pw_dir);
269 /* if we want to set user's shell instead: */
270 /*safe_setenv(env_var_user, "SHELL", pas->pw_shell);*/
271 #else
272 xsetenv("USER", pas->pw_name);
273 xsetenv("HOME", pas->pw_dir);
274 #endif
275 /* currently, we use constant one: */
276 /*setenv("SHELL", DEFAULT_SHELL, 1); - done earlier */
277 }
278
279 static void ChangeUser(struct passwd *pas)
280 {
281 /* careful: we're after vfork! */
282 change_identity(pas); /* - initgroups, setgid, setuid */
283 if (chdir(pas->pw_dir) < 0) {
284 crondlog(LVL9 "can't chdir(%s)", pas->pw_dir);
285 if (chdir(TMPDIR) < 0) {
286 crondlog(DIE9 "can't chdir(%s)", TMPDIR); /* exits */
287 }
288 }
289 }
290
291 static const char DowAry[] ALIGN1 =
292 "sun""mon""tue""wed""thu""fri""sat"
293 /* "Sun""Mon""Tue""Wed""Thu""Fri""Sat" */
294 ;
295
296 static const char MonAry[] ALIGN1 =
297 "jan""feb""mar""apr""may""jun""jul""aug""sep""oct""nov""dec"
298 /* "Jan""Feb""Mar""Apr""May""Jun""Jul""Aug""Sep""Oct""Nov""Dec" */
299 ;
300
301 static void ParseField(char *user, char *ary, int modvalue, int off,
302 const char *names, char *ptr)
303 /* 'names' is a pointer to a set of 3-char abbreviations */
304 {
305 char *base = ptr;
306 int n1 = -1;
307 int n2 = -1;
308
309 // this can't happen due to config_read()
310 /*if (base == NULL)
311 return;*/
312
313 while (1) {
314 int skip = 0;
315
316 /* Handle numeric digit or symbol or '*' */
317 if (*ptr == '*') {
318 n1 = 0; /* everything will be filled */
319 n2 = modvalue - 1;
320 skip = 1;
321 ++ptr;
322 } else if (isdigit(*ptr)) {
323 if (n1 < 0) {
324 n1 = strtol(ptr, &ptr, 10) + off;
325 } else {
326 n2 = strtol(ptr, &ptr, 10) + off;
327 }
328 skip = 1;
329 } else if (names) {
330 int i;
331
332 for (i = 0; names[i]; i += 3) {
333 /* was using strncmp before... */
334 if (strncasecmp(ptr, &names[i], 3) == 0) {
335 ptr += 3;
336 if (n1 < 0) {
337 n1 = i / 3;
338 } else {
339 n2 = i / 3;
340 }
341 skip = 1;
342 break;
343 }
344 }
345 }
346
347 /* handle optional range '-' */
348 if (skip == 0) {
349 goto err;
350 }
351 if (*ptr == '-' && n2 < 0) {
352 ++ptr;
353 continue;
354 }
355
356 /*
357 * collapse single-value ranges, handle skipmark, and fill
358 * in the character array appropriately.
359 */
360 if (n2 < 0) {
361 n2 = n1;
362 }
363 if (*ptr == '/') {
364 skip = strtol(ptr + 1, &ptr, 10);
365 }
366
367 /*
368 * fill array, using a failsafe is the easiest way to prevent
369 * an endless loop
370 */
371 {
372 int s0 = 1;
373 int failsafe = 1024;
374
375 --n1;
376 do {
377 n1 = (n1 + 1) % modvalue;
378
379 if (--s0 == 0) {
380 ary[n1 % modvalue] = 1;
381 s0 = skip;
382 }
383 if (--failsafe == 0) {
384 goto err;
385 }
386 } while (n1 != n2);
387
388 }
389 if (*ptr != ',') {
390 break;
391 }
392 ++ptr;
393 n1 = -1;
394 n2 = -1;
395 }
396
397 if (*ptr) {
398 err:
399 crondlog(WARN9 "user %s: parse error at %s", user, base);
400 return;
401 }
402
403 if (DebugOpt && (LogLevel <= 5)) { /* like LVL5 */
404 /* can't use crondlog, it inserts '\n' */
405 int i;
406 for (i = 0; i < modvalue; ++i)
407 fprintf(stderr, "%d", (unsigned char)ary[i]);
408 fputc('\n', stderr);
409 }
410 }
411
412 static void FixDayDow(CronLine *line)
413 {
414 unsigned i;
415 int weekUsed = 0;
416 int daysUsed = 0;
417
418 for (i = 0; i < ARRAY_SIZE(line->cl_Dow); ++i) {
419 if (line->cl_Dow[i] == 0) {
420 weekUsed = 1;
421 break;
422 }
423 }
424 for (i = 0; i < ARRAY_SIZE(line->cl_Days); ++i) {
425 if (line->cl_Days[i] == 0) {
426 daysUsed = 1;
427 break;
428 }
429 }
430 if (weekUsed != daysUsed) {
431 if (weekUsed)
432 memset(line->cl_Days, 0, sizeof(line->cl_Days));
433 else /* daysUsed */
434 memset(line->cl_Dow, 0, sizeof(line->cl_Dow));
435 }
436 }
437
438 static void SynchronizeFile(const char *fileName)
439 {
440 struct parser_t *parser;
441 struct stat sbuf;
442 int maxLines;
443 char *tokens[6];
444 #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
445 char *mailTo = NULL;
446 #endif
447
448 if (!fileName)
449 return;
450
451 DeleteFile(fileName);
452 parser = config_open(fileName);
453 if (!parser)
454 return;
455
456 maxLines = (strcmp(fileName, "root") == 0) ? 65535 : MAXLINES;
457
458 if (fstat(fileno(parser->fp), &sbuf) == 0 && sbuf.st_uid == DaemonUid) {
459 CronFile *file = xzalloc(sizeof(CronFile));
460 CronLine **pline;
461 int n;
462
463 file->cf_User = xstrdup(fileName);
464 pline = &file->cf_LineBase;
465
466 while (1) {
467 CronLine *line;
468
469 if (!--maxLines)
470 break;
471 n = config_read(parser, tokens, 6, 1, "# \t", PARSE_NORMAL | PARSE_KEEP_COPY);
472 if (!n)
473 break;
474
475 if (DebugOpt)
476 crondlog(LVL5 "user:%s entry:%s", fileName, parser->data);
477
478 /* check if line is setting MAILTO= */
479 if (0 == strncmp(tokens[0], "MAILTO=", 7)) {
480 #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
481 free(mailTo);
482 mailTo = (tokens[0][7]) ? xstrdup(&tokens[0][7]) : NULL;
483 #endif /* otherwise just ignore such lines */
484 continue;
485 }
486 /* check if a minimum of tokens is specified */
487 if (n < 6)
488 continue;
489 *pline = line = xzalloc(sizeof(*line));
490 /* parse date ranges */
491 ParseField(file->cf_User, line->cl_Mins, 60, 0, NULL, tokens[0]);
492 ParseField(file->cf_User, line->cl_Hrs, 24, 0, NULL, tokens[1]);
493 ParseField(file->cf_User, line->cl_Days, 32, 0, NULL, tokens[2]);
494 ParseField(file->cf_User, line->cl_Mons, 12, -1, MonAry, tokens[3]);
495 ParseField(file->cf_User, line->cl_Dow, 7, 0, DowAry, tokens[4]);
496 /*
497 * fix days and dow - if one is not "*" and the other
498 * is "*", the other is set to 0, and vise-versa
499 */
500 FixDayDow(line);
501 #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
502 /* copy mailto (can be NULL) */
503 line->cl_MailTo = xstrdup(mailTo);
504 #endif
505 /* copy command */
506 line->cl_Shell = xstrdup(tokens[5]);
507 if (DebugOpt) {
508 crondlog(LVL5 " command:%s", tokens[5]);
509 }
510 pline = &line->cl_Next;
511 //bb_error_msg("M[%s]F[%s][%s][%s][%s][%s][%s]", mailTo, tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5]);
512 }
513 *pline = NULL;
514
515 file->cf_Next = FileBase;
516 FileBase = file;
517
518 if (maxLines == 0) {
519 crondlog(WARN9 "user %s: too many lines", fileName);
520 }
521 }
522 config_close(parser);
523 }
524
525 static void CheckUpdates(void)
526 {
527 FILE *fi;
528 char buf[256];
529
530 fi = fopen_for_read(CRONUPDATE);
531 if (fi != NULL) {
532 unlink(CRONUPDATE);
533 while (fgets(buf, sizeof(buf), fi) != NULL) {
534 /* use first word only */
535 SynchronizeFile(strtok(buf, " \t\r\n"));
536 }
537 fclose(fi);
538 }
539 }
540
541 static void SynchronizeDir(void)
542 {
543 CronFile *file;
544 /* Attempt to delete the database. */
545 again:
546 for (file = FileBase; file; file = file->cf_Next) {
547 if (!file->cf_Deleted) {
548 DeleteFile(file->cf_User);
549 goto again;
550 }
551 }
552
553 /*
554 * Remove cron update file
555 *
556 * Re-chdir, in case directory was renamed & deleted, or otherwise
557 * screwed up.
558 *
559 * scan directory and add associated users
560 */
561 unlink(CRONUPDATE);
562 if (chdir(CDir) < 0) {
563 crondlog(DIE9 "can't chdir(%s)", CDir);
564 }
565 {
566 DIR *dir = opendir(".");
567 struct dirent *den;
568
569 if (!dir)
570 crondlog(DIE9 "can't chdir(%s)", "."); /* exits */
571 while ((den = readdir(dir)) != NULL) {
572 if (strchr(den->d_name, '.') != NULL) {
573 continue;
574 }
575 if (getpwnam(den->d_name)) {
576 SynchronizeFile(den->d_name);
577 } else {
578 crondlog(LVL7 "ignoring %s", den->d_name);
579 }
580 }
581 closedir(dir);
582 }
583 }
584
585 /*
586 * DeleteFile() - delete user database
587 *
588 * Note: multiple entries for same user may exist if we were unable to
589 * completely delete a database due to running processes.
590 */
591 static void DeleteFile(const char *userName)
592 {
593 CronFile **pfile = &FileBase;
594 CronFile *file;
595
596 while ((file = *pfile) != NULL) {
597 if (strcmp(userName, file->cf_User) == 0) {
598 CronLine **pline = &file->cf_LineBase;
599 CronLine *line;
600
601 file->cf_Running = 0;
602 file->cf_Deleted = 1;
603
604 while ((line = *pline) != NULL) {
605 if (line->cl_Pid > 0) {
606 file->cf_Running = 1;
607 pline = &line->cl_Next;
608 } else {
609 *pline = line->cl_Next;
610 free(line->cl_Shell);
611 free(line);
612 }
613 }
614 if (file->cf_Running == 0) {
615 *pfile = file->cf_Next;
616 free(file->cf_User);
617 free(file);
618 } else {
619 pfile = &file->cf_Next;
620 }
621 } else {
622 pfile = &file->cf_Next;
623 }
624 }
625 }
626
627 /*
628 * TestJobs()
629 *
630 * determine which jobs need to be run. Under normal conditions, the
631 * period is about a minute (one scan). Worst case it will be one
632 * hour (60 scans).
633 */
634 static int TestJobs(time_t t1, time_t t2)
635 {
636 int nJobs = 0;
637 time_t t;
638
639 /* Find jobs > t1 and <= t2 */
640
641 for (t = t1 - t1 % 60; t <= t2; t += 60) {
642 struct tm *tp;
643 CronFile *file;
644 CronLine *line;
645
646 if (t <= t1)
647 continue;
648
649 tp = localtime(&t);
650 for (file = FileBase; file; file = file->cf_Next) {
651 if (DebugOpt)
652 crondlog(LVL5 "file %s:", file->cf_User);
653 if (file->cf_Deleted)
654 continue;
655 for (line = file->cf_LineBase; line; line = line->cl_Next) {
656 if (DebugOpt)
657 crondlog(LVL5 " line %s", line->cl_Shell);
658 if (line->cl_Mins[tp->tm_min] && line->cl_Hrs[tp->tm_hour]
659 && (line->cl_Days[tp->tm_mday] || line->cl_Dow[tp->tm_wday])
660 && line->cl_Mons[tp->tm_mon]
661 ) {
662 if (DebugOpt) {
663 crondlog(LVL5 " job: %d %s",
664 (int)line->cl_Pid, line->cl_Shell);
665 }
666 if (line->cl_Pid > 0) {
667 crondlog(LVL8 "user %s: process already running: %s",
668 file->cf_User, line->cl_Shell);
669 } else if (line->cl_Pid == 0) {
670 line->cl_Pid = -1;
671 file->cf_Ready = 1;
672 ++nJobs;
673 }
674 }
675 }
676 }
677 }
678 return nJobs;
679 }
680
681 static void RunJobs(void)
682 {
683 CronFile *file;
684 CronLine *line;
685
686 for (file = FileBase; file; file = file->cf_Next) {
687 if (!file->cf_Ready)
688 continue;
689
690 file->cf_Ready = 0;
691 for (line = file->cf_LineBase; line; line = line->cl_Next) {
692 if (line->cl_Pid >= 0)
693 continue;
694
695 RunJob(file->cf_User, line);
696 crondlog(LVL8 "USER %s pid %3d cmd %s",
697 file->cf_User, (int)line->cl_Pid, line->cl_Shell);
698 if (line->cl_Pid < 0) {
699 file->cf_Ready = 1;
700 } else if (line->cl_Pid > 0) {
701 file->cf_Running = 1;
702 }
703 }
704 }
705 }
706
707 /*
708 * CheckJobs() - check for job completion
709 *
710 * Check for job completion, return number of jobs still running after
711 * all done.
712 */
713 static int CheckJobs(void)
714 {
715 CronFile *file;
716 CronLine *line;
717 int nStillRunning = 0;
718
719 for (file = FileBase; file; file = file->cf_Next) {
720 if (file->cf_Running) {
721 file->cf_Running = 0;
722
723 for (line = file->cf_LineBase; line; line = line->cl_Next) {
724 int status, r;
725 if (line->cl_Pid <= 0)
726 continue;
727
728 r = waitpid(line->cl_Pid, &status, WNOHANG);
729 if (r < 0 || r == line->cl_Pid) {
730 EndJob(file->cf_User, line);
731 if (line->cl_Pid) {
732 file->cf_Running = 1;
733 }
734 } else if (r == 0) {
735 file->cf_Running = 1;
736 }
737 }
738 }
739 nStillRunning += file->cf_Running;
740 }
741 return nStillRunning;
742 }
743
744 #if ENABLE_FEATURE_CROND_CALL_SENDMAIL
745
746 // TODO: sendmail should be _run-time_ option, not compile-time!
747
748 static void
749 ForkJob(const char *user, CronLine *line, int mailFd,
750 const char *prog, const char *cmd, const char *arg,
751 const char *mail_filename)
752 {
753 struct passwd *pas;
754 pid_t pid;
755
756 /* prepare things before vfork */
757 pas = getpwnam(user);
758 if (!pas) {
759 crondlog(LVL9 "can't get uid for %s", user);
760 goto err;
761 }
762 SetEnv(pas);
763
764 pid = vfork();
765 if (pid == 0) {
766 /* CHILD */
767 /* change running state to the user in question */
768 ChangeUser(pas);
769 if (DebugOpt) {
770 crondlog(LVL5 "child running %s", prog);
771 }
772 if (mailFd >= 0) {
773 xmove_fd(mailFd, mail_filename ? 1 : 0);
774 dup2(1, 2);
775 }
776 /* crond 3.0pl1-100 puts tasks in separate process groups */
777 bb_setpgrp();
778 execlp(prog, prog, cmd, arg, (char *) NULL);
779 crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user, prog, cmd, arg);
780 if (mail_filename) {
781 fdprintf(1, "Exec failed: %s -c %s\n", prog, arg);
782 }
783 _exit(EXIT_SUCCESS);
784 }
785
786 line->cl_Pid = pid;
787 if (pid < 0) {
788 /* FORK FAILED */
789 crondlog(ERR20 "can't vfork");
790 err:
791 line->cl_Pid = 0;
792 if (mail_filename) {
793 unlink(mail_filename);
794 }
795 } else if (mail_filename) {
796 /* PARENT, FORK SUCCESS
797 * rename mail-file based on pid of process
798 */
799 char mailFile2[128];
800
801 snprintf(mailFile2, sizeof(mailFile2), "%s/cron.%s.%d", TMPDIR, user, pid);
802 rename(mail_filename, mailFile2); // TODO: xrename?
803 }
804
805 /*
806 * Close the mail file descriptor.. we can't just leave it open in
807 * a structure, closing it later, because we might run out of descriptors
808 */
809 if (mailFd >= 0) {
810 close(mailFd);
811 }
812 }
813
814 static void RunJob(const char *user, CronLine *line)
815 {
816 char mailFile[128];
817 int mailFd = -1;
818
819 line->cl_Pid = 0;
820 line->cl_MailFlag = 0;
821
822 if (line->cl_MailTo) {
823 /* open mail file - owner root so nobody can screw with it. */
824 snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, getpid());
825 mailFd = open(mailFile, O_CREAT | O_TRUNC | O_WRONLY | O_EXCL | O_APPEND, 0600);
826
827 if (mailFd >= 0) {
828 line->cl_MailFlag = 1;
829 fdprintf(mailFd, "To: %s\nSubject: cron: %s\n\n", line->cl_MailTo,
830 line->cl_Shell);
831 line->cl_MailPos = lseek(mailFd, 0, SEEK_CUR);
832 } else {
833 crondlog(ERR20 "cannot create mail file %s for user %s, "
834 "discarding output", mailFile, user);
835 }
836 }
837
838 ForkJob(user, line, mailFd, DEFAULT_SHELL, "-c", line->cl_Shell, mailFile);
839 }
840
841 /*
842 * EndJob - called when job terminates and when mail terminates
843 */
844 static void EndJob(const char *user, CronLine *line)
845 {
846 int mailFd;
847 char mailFile[128];
848 struct stat sbuf;
849
850 /* No job */
851 if (line->cl_Pid <= 0) {
852 line->cl_Pid = 0;
853 return;
854 }
855
856 /*
857 * End of job and no mail file
858 * End of sendmail job
859 */
860 snprintf(mailFile, sizeof(mailFile), "%s/cron.%s.%d", TMPDIR, user, line->cl_Pid);
861 line->cl_Pid = 0;
862
863 if (line->cl_MailFlag == 0) {
864 return;
865 }
866 line->cl_MailFlag = 0;
867
868 /*
869 * End of primary job - check for mail file. If size has increased and
870 * the file is still valid, we sendmail it.
871 */
872 mailFd = open(mailFile, O_RDONLY);
873 unlink(mailFile);
874 if (mailFd < 0) {
875 return;
876 }
877
878 if (fstat(mailFd, &sbuf) < 0 || sbuf.st_uid != DaemonUid
879 || sbuf.st_nlink != 0 || sbuf.st_size == line->cl_MailPos
880 || !S_ISREG(sbuf.st_mode)
881 ) {
882 close(mailFd);
883 return;
884 }
885 if (line->cl_MailTo)
886 ForkJob(user, line, mailFd, SENDMAIL, SENDMAIL_ARGS, NULL);
887 }
888
889 #else /* crond without sendmail */
890
891 static void RunJob(const char *user, CronLine *line)
892 {
893 struct passwd *pas;
894 pid_t pid;
895
896 /* prepare things before vfork */
897 pas = getpwnam(user);
898 if (!pas) {
899 crondlog(LVL9 "can't get uid for %s", user);
900 goto err;
901 }
902 SetEnv(pas);
903
904 /* fork as the user in question and run program */
905 pid = vfork();
906 if (pid == 0) {
907 /* CHILD */
908 /* change running state to the user in question */
909 ChangeUser(pas);
910 if (DebugOpt) {
911 crondlog(LVL5 "child running %s", DEFAULT_SHELL);
912 }
913 /* crond 3.0pl1-100 puts tasks in separate process groups */
914 bb_setpgrp();
915 execl(DEFAULT_SHELL, DEFAULT_SHELL, "-c", line->cl_Shell, (char *) NULL);
916 crondlog(ERR20 "can't exec, user %s cmd %s %s %s", user,
917 DEFAULT_SHELL, "-c", line->cl_Shell);
918 _exit(EXIT_SUCCESS);
919 }
920 if (pid < 0) {
921 /* FORK FAILED */
922 crondlog(ERR20 "can't vfork");
923 err:
924 pid = 0;
925 }
926 line->cl_Pid = pid;
927 }
928
929 #endif /* ENABLE_FEATURE_CROND_CALL_SENDMAIL */
Tomato firmware and modifications.