masqmail
view src/masqmail.c @ 314:e74ee75453db
small wording change
| author | meillo@marmaro.de |
|---|---|
| date | Mon, 25 Apr 2011 15:14:04 +0200 |
| parents | 792e0201c1b3 |
| children | e507c854a63e |
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
20 #include <stdio.h>
21 #include <errno.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <unistd.h>
25 #include <sys/types.h>
26 #include <sys/socket.h>
27 #include <sys/time.h>
28 #include <netinet/in.h>
29 #include <netdb.h>
30 #include <syslog.h>
31 #include <signal.h>
33 #include <glib.h>
35 #include "masqmail.h"
37 /* mutually exclusive modes. Note that there is no 'queue daemon' mode.
38 It, as well as the distinction beween the two (non exclusive) daemon
39 (queue and listen) modes, is handled by flags.*/
40 enum mta_mode {
41 MODE_NONE = 0, /* to check if a mode was set */
42 MODE_ACCEPT, /* accept message on stdin (fallback mode) */
43 MODE_DAEMON, /* run as daemon */
44 MODE_RUNQUEUE, /* single queue run, online or offline */
45 MODE_SMTP, /* accept SMTP on stdin */
46 MODE_LIST, /* list queue */
47 MODE_MCMD, /* do queue manipulation */
48 MODE_VERSION, /* show version */
49 MODE_BI, /* fake ;-) */
50 };
51 enum mta_mode mta_mode = MODE_NONE;
53 char *pidfile = NULL;
54 volatile int sigterm_in_progress = 0;
56 static void
57 sigterm_handler(int sig)
58 {
59 if (sigterm_in_progress)
60 raise(sig);
61 sigterm_in_progress = 1;
63 if (pidfile) {
64 uid_t uid;
65 uid = seteuid(0);
66 if (unlink(pidfile) != 0)
67 logwrite(LOG_WARNING, "could not delete pid file %s: %s\n", pidfile, strerror(errno));
68 seteuid(uid); /* we exit anyway after this, just to be sure */
69 }
71 signal(sig, SIG_DFL);
72 raise(sig);
73 }
75 #ifdef ENABLE_IDENT /* so far used for that only */
76 static gboolean
77 is_in_netlist(gchar * host, GList * netlist)
78 {
79 guint hostip = inet_addr(host);
80 struct in_addr addr;
82 addr.s_addr = hostip;
83 if (addr.s_addr != INADDR_NONE) {
84 GList *node;
85 foreach(netlist, node) {
86 struct in_addr *net = (struct in_addr *) (node->data);
87 if ((addr.s_addr & net->s_addr) == net->s_addr)
88 return TRUE;
89 }
90 }
91 return FALSE;
92 }
93 #endif
95 /*
96 argv: the original argv
97 argp: number of arg (may get modified!)
98 cp: pointing to the char after the option
99 e.g. `-d 6' `-d6'
100 ^ ^
101 */
102 gchar*
103 get_optarg(char* argv[], gint* argp, char* cp)
104 {
105 if (*cp) {
106 /* this kind: -xval */
107 return cp;
108 }
109 cp = argv[*argp+1];
110 if (cp && (*cp != '-')) {
111 /* this kind: -x val */
112 (*argp)++;
113 return cp;
114 }
115 return NULL;
116 }
118 gboolean
119 write_pidfile(gchar * name)
120 {
121 FILE *fptr;
123 if ((fptr = fopen(name, "wt"))) {
124 fprintf(fptr, "%d\n", getpid());
125 fclose(fptr);
126 pidfile = strdup(name);
127 return TRUE;
128 }
129 logwrite(LOG_WARNING, "could not write pid file: %s\n", strerror(errno));
130 return FALSE;
131 }
133 /* on -bd or if -q has an argument */
134 static void
135 mode_daemon(gboolean do_listen, gint queue_interval, char *argv[])
136 {
137 guint pid;
139 /* daemon */
140 if (!conf.run_as_user) {
141 if ((conf.orig_uid != 0) && (conf.orig_uid != conf.mail_uid)) {
142 fprintf(stderr, "must be root or %s for daemon.\n", DEF_MAIL_USER);
143 exit(1);
144 }
145 }
147 /* reparent to init only if init is not already the parent */
148 if (getppid() != 1) {
149 if ((pid = fork()) > 0) {
150 exit(0);
151 } else if (pid < 0) {
152 logwrite(LOG_ALERT, "could not fork!\n");
153 exit(1);
154 }
155 }
157 signal(SIGTERM, sigterm_handler);
158 write_pidfile(PIDFILEDIR "/masqmail.pid");
160 conf.do_verbose = FALSE;
162 /* closing and reopening the log ensures that it is open afterwards
163 because it is possible that the log is assigned to fd 1 and gets
164 thus closes by fclose(stdout). Similar for the debugfile.
165 */
166 logclose();
167 fclose(stdin);
168 fclose(stdout);
169 fclose(stderr);
170 logopen();
172 logwrite(LOG_NOTICE, "%s %s daemon starting\n", PACKAGE, VERSION);
173 listen_port(do_listen ? conf.listen_addresses : NULL, queue_interval, argv);
174 }
176 /* -bs or called as smtpd or in.smtpd */
177 static void
178 mode_smtp()
179 {
180 /* accept smtp message on stdin */
181 /* write responses to stderr. */
183 struct sockaddr_in saddr;
184 gchar *peername = NULL;
185 int dummy = sizeof(saddr);
187 conf.do_verbose = FALSE;
189 if (!conf.run_as_user) {
190 seteuid(conf.orig_uid);
191 setegid(conf.orig_gid);
192 }
194 DEBUG(5) debugf("accepting smtp message on stdin\n");
196 if (getpeername(0, (struct sockaddr *) (&saddr), &dummy) == 0) {
197 peername = g_strdup(inet_ntoa(saddr.sin_addr));
198 } else if (errno != ENOTSOCK)
199 exit(1);
201 smtp_in(stdin, stderr, peername, NULL);
202 }
204 /* default mode if address args or -t is specified, or called as rmail */
205 static void
206 mode_accept(address * return_path, gchar * full_sender_name, guint accept_flags, char **addresses, int addr_cnt)
207 {
208 /* accept message on stdin */
209 accept_error err;
210 message *msg = create_message();
211 gint i;
212 pid_t pid;
214 if (return_path && !is_privileged_user(conf.orig_uid)) {
215 fprintf(stderr, "must be root, %s or in group %s for setting return path.\n", DEF_MAIL_USER, DEF_MAIL_GROUP);
216 exit(1);
217 }
219 if (!conf.run_as_user) {
220 seteuid(conf.orig_uid);
221 setegid(conf.orig_gid);
222 }
224 DEBUG(5) debugf("accepting message on stdin\n");
226 msg->received_prot = PROT_LOCAL;
228 /* warn if -t option and cmdline addr args */
229 if (addr_cnt && (accept_flags & ACC_RCPT_FROM_HEAD)) {
230 logwrite(LOG_ALERT, "command line address arguments are now *added* to the mail header\\\n");
231 logwrite(LOG_ALERT, " recipient addresses (instead of substracted) when -t is given.\\\n");
232 logwrite(LOG_ALERT, " this changed with version 0.3.1\n");
233 }
235 for (i = 0; i < addr_cnt; i++) {
236 if (addresses[i][0] == '|') {
237 logwrite(LOG_ALERT, "no pipe allowed as recipient address: %s\n", addresses[i]);
238 /* should we better ignore this one addr? */
239 exit(1);
240 }
241 msg->rcpt_list = g_list_append(msg->rcpt_list, create_address_qualified(addresses[i], TRUE, conf.host_name));
242 }
244 /* -f option */
245 msg->return_path = return_path;
247 /* -F option */
248 msg->full_sender_name = full_sender_name;
250 err = accept_message(stdin, msg, accept_flags);
252 switch (err) {
253 case AERR_OK:
254 /* to continue; all other cases exit */
255 break;
256 case AERR_EOF:
257 fprintf(stderr, "unexpected EOF.\n");
258 exit(1);
259 case AERR_NORCPT:
260 fprintf(stderr, "no recipients.\n");
261 exit(1);
262 case AERR_SIZE:
263 fprintf(stderr, "max message size exceeded.\n");
264 exit(1);
265 default:
266 /* should never happen: */
267 fprintf(stderr, "Unknown error (%d)\r\n", err);
268 exit(1);
269 }
271 if (!spool_write(msg, TRUE)) {
272 fprintf(stderr, "Could not write spool file\n");
273 exit(1);
274 }
276 /* here the mail is queued and thus in our responsibility */
277 logwrite(LOG_NOTICE, "%s <= %s with %s\n", msg->uid, addr_string(msg->return_path), prot_names[PROT_LOCAL]);
279 if (conf.do_queue) {
280 /* we're finished as we only need to queue it */
281 return;
282 }
284 /* deliver at once */
285 if ((pid = fork()) < 0) {
286 logwrite(LOG_ALERT, "could not fork for delivery, id = %s\n", msg->uid);
287 } else if (pid == 0) {
288 conf.do_verbose = FALSE;
289 fclose(stdin);
290 fclose(stdout);
291 fclose(stderr);
292 if (deliver(msg)) {
293 exit(0);
294 } else {
295 /*
296 TODO:
297 Should we really fail here? Because the mail is queued
298 already. If we fail the client might submit it again.
299 If at-once-delivery is seen as an additional best-effort
300 service, then we should still exit successful here.
301 */
302 exit(1);
303 }
304 }
305 }
307 /*
308 if -Mrm is given
310 currently only the `rm' command is supported
311 until this changes, we don't need any facility for further commands
312 return success if at least one message had been deleted
313 */
314 static int
315 manipulate_queue(char* cmd, char* id[])
316 {
317 gboolean ok = FALSE;
319 if (strcmp(cmd, "rm") != 0) {
320 fprintf(stderr, "unknown command %s\n", cmd);
321 return FALSE;
322 }
324 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
326 /* privileged users may delete any mail */
327 if (is_privileged_user(conf.orig_uid)) {
328 for (; *id; id++) {
329 fprintf(stderr, "id: %s\n", *id);
330 if (queue_delete(*id)) {
331 ok = TRUE;
332 }
333 }
334 return ok;
335 }
337 struct passwd *pw = getpwuid(conf.orig_uid);
338 if (!pw) {
339 fprintf(stderr, "could not find a passwd entry for uid %d: %s\n",
340 conf.orig_uid, strerror(errno));
341 return FALSE;
342 }
344 /* non-privileged users may only delete their own messages */
345 for (; *id; id++) {
346 message *msg = msg_spool_read(*id, FALSE);
348 fprintf(stderr, "id: %s\n", *id);
350 if (!msg->ident) {
351 fprintf(stderr, "message %s does not have an ident\n", *id);
352 continue;
353 }
354 if (strcmp(pw->pw_name, msg->ident) != 0) {
355 fprintf(stderr, "you do not own message id %s\n", *id);
356 continue;
357 }
359 if ( (msg->received_host || (msg->received_prot != PROT_LOCAL))
360 #ifdef ENABLE_IDENT
361 && !is_in_netlist(msg->received_host, conf.ident_trusted_nets)
362 #endif
363 ) {
364 fprintf(stderr, "message %s was not received locally or from a trusted network\n", *id);
365 continue;
366 }
368 ok = queue_delete(*id);
369 }
370 return ok;
371 }
373 /* -qo, -q (without argument), or called as runq */
374 static int
375 run_queue(gboolean do_runq, gboolean do_runq_online, char* route_name)
376 {
377 int ret;
379 /* queue runs */
380 set_identity(conf.orig_uid, "queue run");
382 if (do_runq) {
383 ret = queue_run();
384 }
386 if (do_runq_online) {
387 if (route_name) {
388 conf.online_query = g_strdup_printf("/bin/echo %s", route_name);
389 }
390 /* TODO: change behavior of `-qo without argument'?
391 Because that behavior is included in -q. */
392 ret = queue_run_online();
393 }
394 return ret;
395 }
397 /* -bV or default mode if neither addr arg nor -t */
398 static void
399 mode_version(void)
400 {
401 gchar *with_resolver = "";
402 gchar *with_auth = "";
403 gchar *with_ident = "";
405 #ifdef ENABLE_RESOLVER
406 with_resolver = " +resolver";
407 #endif
408 #ifdef ENABLE_AUTH
409 with_auth = " +auth";
410 #endif
411 #ifdef ENABLE_IDENT
412 with_ident = " +ident";
413 #endif
415 printf("%s %s%s%s%s\n", PACKAGE, VERSION, with_resolver, with_auth, with_ident);
416 }
418 void
419 set_mode(enum mta_mode mode)
420 {
421 if (mta_mode && mta_mode!=mode) {
422 fprintf(stderr, "operation mode was already specified (%d vs. %d)\n", mta_mode, mode);
423 exit(1);
424 }
426 mta_mode = mode;
427 return;
428 }
430 int
431 main(int argc, char *argv[])
432 {
433 gchar *progname;
434 char* opt;
435 gint arg;
437 gboolean do_listen = FALSE;
438 gboolean do_runq = FALSE;
439 gboolean do_runq_online = FALSE;
440 gboolean do_queue = FALSE;
441 gint queue_interval = 0;
442 gchar *M_cmd = NULL;
443 gboolean opt_t = FALSE;
444 gboolean opt_i = FALSE;
445 gchar *conf_file = CONF_FILE;
446 gchar *route_name = NULL;
447 gchar *f_address = NULL;
448 address *return_path = NULL; /* may be changed by -f option */
449 gchar *full_sender_name = NULL;
450 gboolean do_verbose = FALSE;
451 gint debug_level = -1;
453 /* strip the path part */
454 progname = strrchr(argv[0], '/');
455 progname = (progname) ? progname+1 : argv[0];
457 if (strcmp(progname, "mailq") == 0) {
458 mta_mode = MODE_LIST;
459 } else if (strcmp(progname, "mailrm") == 0) {
460 mta_mode = MODE_MCMD;
461 M_cmd = "rm";
462 } else if (strcmp(progname, "newaliases") == 0) {
463 mta_mode = MODE_BI;
464 } else if (strcmp(progname, "rmail") == 0) {
465 /* the `rmail' alias should probably be removed now
466 that we have the rmail script. But let's keep it
467 for some while for compatibility. 2010-06-19 */
468 mta_mode = MODE_ACCEPT;
469 opt_i = TRUE;
470 } else if (strcmp(progname, "runq") == 0) {
471 mta_mode = MODE_RUNQUEUE;
472 do_runq = TRUE;
473 } else if (strcmp(progname, "smtpd") == 0
474 || strcmp(progname, "in.smtpd") == 0) {
475 mta_mode = MODE_SMTP;
476 }
478 /* parse cmd line */
479 for (arg=1; arg<argc && argv[arg][0]=='-'; arg++) {
480 opt = argv[arg] + 1; /* points to the char after the dash */
482 if (strcmp(opt, "-") == 0) {
483 /* everything after `--' are address arguments */
484 arg++;
485 break;
487 } else if (strcmp(opt, "bm") == 0) {
488 set_mode(MODE_ACCEPT);
490 } else if (strcmp(opt, "bd") == 0) {
491 set_mode(MODE_DAEMON);
492 do_listen = TRUE;
494 } else if (strcmp(opt, "bi") == 0) {
495 set_mode(MODE_BI);
497 } else if (strcmp(opt, "bs") == 0) {
498 set_mode(MODE_SMTP);
500 } else if (strcmp(opt, "bp") == 0) {
501 set_mode(MODE_LIST);
503 } else if (strcmp(opt, "bV") == 0) {
504 set_mode(MODE_VERSION);
506 } else if (strncmp(opt, "B", 1) == 0) {
507 /* we ignore this and throw the argument away */
508 get_optarg(argv, &arg, opt+1);
510 } else if (strncmp(opt, "C", 1) == 0) {
511 conf_file = get_optarg(argv, &arg, opt+1);
512 if (!conf_file) {
513 fprintf(stderr, "-C requires a filename as argument.\n");
514 exit(1);
515 }
517 } else if (strncmp(opt, "d", 1) == 0) {
518 if (getuid() != 0) {
519 fprintf(stderr, "only root may set the debug level.\n");
520 exit(1);
521 }
522 char *lvl = get_optarg(argv, &arg, opt+1);
523 if (!lvl) {
524 fprintf(stderr, "-d requires a number argument.\n");
525 exit(1);
526 }
527 debug_level = atoi(lvl);
529 } else if (strncmp(opt, "f", 1) == 0) {
530 /* set return path */
531 gchar *address = get_optarg(argv, &arg, opt+1);
532 if (!address) {
533 fprintf(stderr, "-f requires an address argument\n");
534 exit(1);
535 }
536 f_address = g_strdup(address);
538 } else if (strncmp(opt, "F", 1) == 0) {
539 full_sender_name = get_optarg(argv, &arg, opt+1);
540 if (!full_sender_name) {
541 fprintf(stderr, "-F requires a name argument\n");
542 exit(1);
543 }
545 } else if (strcmp(opt, "i") == 0) {
546 opt_i = TRUE;
548 } else if (strcmp(opt, "m") == 0) {
549 /* ignore -m (me too) switch (see man page) */
551 } else if (strcmp(opt, "Mrm") == 0) {
552 set_mode(MODE_MCMD);
553 M_cmd = "rm";
555 } else if (strcmp(opt, "odq") == 0) {
556 do_queue = TRUE;
558 } else if (strcmp(opt, "oi") == 0) {
559 opt_i = TRUE;
561 } else if (strncmp(opt, "o", 1) == 0) {
562 /* ignore all other -oXXX options */
564 } else if (strncmp(opt, "qo", 2) == 0) {
565 /* must be before the `q' check */
566 set_mode(MODE_RUNQUEUE);
567 do_runq_online = TRUE;
568 /* can be NULL, then we use online detection method */
569 /* TODO: behavior might change if it is NULL */
570 route_name = get_optarg(argv, &arg, opt+2);
571 if (!route_name) {
572 fprintf(stderr, "Please do not use -qo without argument anymore; use -q instead.\n");
573 fprintf(stderr, "The behavior for -qo without argument is likely to change.\n");
574 }
576 } else if (strncmp(opt, "q", 1) == 0) {
577 /* must be after the `qo' check */
578 gchar *optarg;
580 optarg = get_optarg(argv, &arg, opt+1);
581 if (optarg) {
582 /* not just one single queue run but regular runs */
583 set_mode(MODE_DAEMON);
584 queue_interval = time_interval(optarg);
585 } else {
586 set_mode(MODE_RUNQUEUE);
587 do_runq = TRUE;
588 }
590 } else if (strcmp(opt, "t") == 0) {
591 opt_t = TRUE;
593 } else if (strcmp(opt, "v") == 0) {
594 do_verbose = TRUE;
596 } else {
597 fprintf(stderr, "unrecognized option `-%s'\n", opt);
598 exit(1);
599 }
600 }
602 if (!mta_mode && arg==argc && !opt_t) {
603 /*
604 In this case no rcpts can be found, thus no mail
605 can be sent, thus masqmail will always fail. We
606 rather do something better instead. This covers
607 also the case of calling masqmail without args.
608 */
609 mode_version();
610 exit(0);
611 }
613 if (mta_mode == MODE_VERSION) {
614 mode_version();
615 exit(0);
616 }
618 if (!mta_mode) {
619 mta_mode = MODE_ACCEPT;
620 }
622 /* initialize random generator */
623 srand(time(NULL));
624 /* ignore SIGPIPE signal */
625 signal(SIGPIPE, SIG_IGN);
627 /* close all possibly open file descriptors, except std{in,out,err} */
628 {
629 int i, max_fd = sysconf(_SC_OPEN_MAX);
631 if (max_fd <= 0) {
632 max_fd = 64;
633 }
634 for (i=3; i<max_fd; i++) {
635 close(i);
636 }
637 }
639 init_conf();
641 /* if we are not privileged, and the config file was changed we
642 implicetely set the the run_as_user flag and give up all
643 privileges.
645 So it is possible for a user to run his own daemon without
646 breaking security.
647 */
648 if ((strcmp(conf_file, CONF_FILE) != 0) && (conf.orig_uid != 0)) {
649 conf.run_as_user = TRUE;
650 seteuid(conf.orig_uid);
651 setegid(conf.orig_gid);
652 setuid(conf.orig_uid);
653 setgid(conf.orig_gid);
654 }
656 conf.log_dir = LOG_DIR;
657 /* FIXME: fails if we run as user */
658 logopen();
659 if (!read_conf(conf_file)) {
660 logwrite(LOG_ALERT, "SHUTTING DOWN due to problems reading config\n");
661 exit(5);
662 }
663 logclose();
665 if (do_queue) {
666 conf.do_queue = TRUE;
667 }
668 if (do_verbose) {
669 conf.do_verbose = TRUE;
670 }
671 if (debug_level >= 0) { /* if >= 0, it was given by argument */
672 conf.debug_level = debug_level;
673 }
675 /* It appears that changing to / ensures that we are never in
676 a directory which we cannot access. This situation could be
677 possible after changing identity.
678 Maybe we should only change to / if we not run as user, to
679 allow relative paths for log files in test setups for
680 instance.
681 */
682 chdir("/");
684 if (!conf.run_as_user) {
685 if (setgid(0) != 0) {
686 fprintf(stderr, "could not set gid to 0. Is the setuid bit set? : %s\n", strerror(errno));
687 exit(1);
688 }
689 if (setuid(0) != 0) {
690 fprintf(stderr, "could not gain root privileges. Is the setuid bit set? : %s\n", strerror(errno));
691 exit(1);
692 }
693 }
695 if (!logopen()) {
696 fprintf(stderr, "could not open log file\n");
697 exit(1);
698 }
700 DEBUG(1) debugf("masqmail %s starting\n", VERSION);
702 DEBUG(5) {
703 gchar **str = argv;
704 debugf("args: \n");
705 while (*str) {
706 debugf("%s \n", *str);
707 str++;
708 }
709 }
710 DEBUG(5) debugf("queue_interval = %d\n", queue_interval);
712 if (f_address) {
713 return_path = create_address_qualified(f_address, TRUE, conf.host_name);
714 g_free(f_address);
715 if (!return_path) {
716 fprintf(stderr, "invalid RFC821 address: %s\n", f_address);
717 exit(1);
718 }
719 }
721 switch (mta_mode) {
722 case MODE_DAEMON:
723 mode_daemon(do_listen, queue_interval, argv);
724 break;
726 case MODE_RUNQUEUE:
727 exit(run_queue(do_runq, do_runq_online, route_name) ? 0 : 1);
728 break;
730 case MODE_SMTP:
731 mode_smtp();
732 break;
734 case MODE_LIST:
735 queue_list();
736 break;
738 case MODE_BI:
739 exit(0);
740 break; /* well... */
742 case MODE_MCMD:
743 exit(manipulate_queue(M_cmd, &argv[arg]) ? 0 : 1);
744 break;
746 case MODE_ACCEPT:
747 {
748 guint accept_flags = (opt_t ? ACC_RCPT_FROM_HEAD : 0)
749 | (opt_i ? ACC_DOT_IGNORE : ACC_NODOT_RELAX);
750 mode_accept(return_path, full_sender_name, accept_flags, &(argv[arg]), argc - arg);
751 exit(0);
752 }
753 break;
755 default:
756 fprintf(stderr, "unknown mode: %d\n", mta_mode);
757 break;
758 }
760 logclose();
762 exit(0);
763 }