masqmail
view src/masqmail.c @ 255:2e7d3a02edb1
removed a magic number from time_interval()
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Thu, 04 Nov 2010 14:56:47 -0300 |
| parents | 2babd21e7c75 |
| children | 8cca5305e4f0 |
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 typedef enum _mta_mode {
41 MODE_ACCEPT = 0, /* accept message on stdin */
42 MODE_DAEMON, /* run as daemon */
43 MODE_RUNQUEUE, /* single queue run, online or offline */
44 MODE_SMTP, /* accept SMTP on stdin */
45 MODE_LIST, /* list queue */
46 MODE_MCMD, /* do queue manipulation */
47 MODE_VERSION, /* show version */
48 MODE_BI, /* fake ;-) */
49 MODE_NONE /* to prevent default MODE_ACCEPT */
50 } mta_mode;
52 char *pidfile = NULL;
53 volatile int sigterm_in_progress = 0;
55 static void
56 sigterm_handler(int sig)
57 {
58 if (sigterm_in_progress)
59 raise(sig);
60 sigterm_in_progress = 1;
62 if (pidfile) {
63 uid_t uid;
64 uid = seteuid(0);
65 if (unlink(pidfile) != 0)
66 logwrite(LOG_WARNING, "could not delete pid file %s: %s\n", pidfile, strerror(errno));
67 seteuid(uid); /* we exit anyway after this, just to be sure */
68 }
70 signal(sig, SIG_DFL);
71 raise(sig);
72 }
74 #ifdef ENABLE_IDENT /* so far used for that only */
75 static gboolean
76 is_in_netlist(gchar * host, GList * netlist)
77 {
78 guint hostip = inet_addr(host);
79 struct in_addr addr;
81 addr.s_addr = hostip;
82 if (addr.s_addr != INADDR_NONE) {
83 GList *node;
84 foreach(netlist, node) {
85 struct in_addr *net = (struct in_addr *) (node->data);
86 if ((addr.s_addr & net->s_addr) == net->s_addr)
87 return TRUE;
88 }
89 }
90 return FALSE;
91 }
92 #endif
94 /*
95 argv: the original argv
96 argp: number of arg (may get modified!)
97 cp: pointing to the char after the option
98 e.g. `-d 6' `-d6'
99 ^ ^
100 */
101 gchar*
102 get_optarg(char* argv[], gint* argp, char* cp)
103 {
104 if (*cp) {
105 /* this kind: -xval */
106 return cp;
107 }
108 cp = argv[*argp+1];
109 if (cp && (*cp != '-')) {
110 /* this kind: -x val */
111 (*argp)++;
112 return cp;
113 }
114 return NULL;
115 }
117 gchar*
118 get_progname(gchar * arg0)
119 {
120 gchar *p = arg0 + strlen(arg0) - 1;
121 while (p > arg0) {
122 if (*p == '/')
123 return p + 1;
124 p--;
125 }
126 return p;
127 }
129 gboolean
130 write_pidfile(gchar * name)
131 {
132 FILE *fptr;
134 if ((fptr = fopen(name, "wt"))) {
135 fprintf(fptr, "%d\n", getpid());
136 fclose(fptr);
137 pidfile = strdup(name);
138 return TRUE;
139 }
140 logwrite(LOG_WARNING, "could not write pid file: %s\n", strerror(errno));
141 return FALSE;
142 }
144 static void
145 mode_daemon(gboolean do_listen, gint queue_interval, char *argv[])
146 {
147 guint pid;
149 /* daemon */
150 if (!conf.run_as_user) {
151 if ((conf.orig_uid != 0) && (conf.orig_uid != conf.mail_uid)) {
152 fprintf(stderr, "must be root or %s for daemon.\n", DEF_MAIL_USER);
153 exit(EXIT_FAILURE);
154 }
155 }
157 /* reparent to init only if init is not already the parent */
158 if (getppid() != 1) {
159 if ((pid = fork()) > 0) {
160 exit(EXIT_SUCCESS);
161 } else if (pid < 0) {
162 logwrite(LOG_ALERT, "could not fork!\n");
163 exit(EXIT_FAILURE);
164 }
165 }
167 signal(SIGTERM, sigterm_handler);
168 write_pidfile(PIDFILEDIR "/masqmail.pid");
170 conf.do_verbose = FALSE;
172 /* closing and reopening the log ensures that it is open afterwards
173 because it is possible that the log is assigned to fd 1 and gets
174 thus closes by fclose(stdout). Similar for the debugfile.
175 */
176 logclose();
177 fclose(stdin);
178 fclose(stdout);
179 fclose(stderr);
180 logopen();
182 logwrite(LOG_NOTICE, "%s %s daemon starting\n", PACKAGE, VERSION);
183 listen_port(do_listen ? conf.listen_addresses : NULL, queue_interval, argv);
184 }
186 static void
187 mode_smtp()
188 {
189 /* accept smtp message on stdin */
190 /* write responses to stderr. */
192 struct sockaddr_in saddr;
193 gchar *peername = NULL;
194 int dummy = sizeof(saddr);
196 conf.do_verbose = FALSE;
198 if (!conf.run_as_user) {
199 seteuid(conf.orig_uid);
200 setegid(conf.orig_gid);
201 }
203 DEBUG(5) debugf("accepting smtp message on stdin\n");
205 if (getpeername(0, (struct sockaddr *) (&saddr), &dummy) == 0) {
206 peername = g_strdup(inet_ntoa(saddr.sin_addr));
207 } else if (errno != ENOTSOCK)
208 exit(EXIT_FAILURE);
210 smtp_in(stdin, stderr, peername, NULL);
211 }
213 static void
214 mode_accept(address * return_path, gchar * full_sender_name, guint accept_flags, char **addresses, int addr_cnt)
215 {
216 /* accept message on stdin */
217 accept_error err;
218 message *msg = create_message();
219 gint i;
221 if (return_path && !is_privileged_user(conf.orig_uid)) {
222 fprintf(stderr, "must be root, %s or in group %s for setting return path.\n", DEF_MAIL_USER, DEF_MAIL_GROUP);
223 exit(EXIT_FAILURE);
224 }
226 if (!conf.run_as_user) {
227 seteuid(conf.orig_uid);
228 setegid(conf.orig_gid);
229 }
231 DEBUG(5) debugf("accepting message on stdin\n");
233 msg->received_prot = PROT_LOCAL;
234 for (i = 0; i < addr_cnt; i++) {
235 if (addresses[i][0] != '|')
236 msg->rcpt_list = g_list_append(msg->rcpt_list, create_address_qualified(addresses[i], TRUE, conf.host_name));
237 else {
238 logwrite(LOG_ALERT, "no pipe allowed as recipient address: %s\n", addresses[i]);
239 exit(EXIT_FAILURE);
240 }
241 }
243 /* -f option */
244 msg->return_path = return_path;
246 /* -F option */
247 msg->full_sender_name = full_sender_name;
249 if ((err = accept_message(stdin, msg, accept_flags)) == AERR_OK) {
250 if (spool_write(msg, TRUE)) {
251 pid_t pid;
252 logwrite(LOG_NOTICE, "%s <= %s with %s\n", msg->uid, addr_string(msg->return_path), prot_names[PROT_LOCAL]);
254 if (!conf.do_queue) {
255 if ((pid = fork()) == 0) {
256 conf.do_verbose = FALSE;
257 fclose(stdin);
258 fclose(stdout);
259 fclose(stderr);
260 if (deliver(msg)) {
261 exit(EXIT_SUCCESS);
262 } else
263 exit(EXIT_FAILURE);
264 } else if (pid < 0) {
265 logwrite(LOG_ALERT, "could not fork for delivery, id = %s\n", msg->uid);
266 }
267 }
268 } else {
269 fprintf(stderr, "Could not write spool file\n");
270 exit(EXIT_FAILURE);
271 }
272 } else {
273 switch (err) {
274 case AERR_EOF:
275 fprintf(stderr, "unexpected EOF.\n");
276 exit(EXIT_FAILURE);
277 case AERR_NORCPT:
278 fprintf(stderr, "no recipients.\n");
279 exit(EXIT_FAILURE);
280 case AERR_SIZE:
281 fprintf(stderr, "max message size exceeded.\n");
282 exit(EXIT_FAILURE);
283 default:
284 /* should never happen: */
285 fprintf(stderr, "Unknown error (%d)\r\n", err);
286 exit(EXIT_FAILURE);
287 }
288 exit(EXIT_FAILURE);
289 }
290 }
292 /*
293 currently only the `rm' command is supported
294 until this changes, we don't need any facility for further commands
295 return success if at least one message had been deleted
296 */
297 static int
298 manipulate_queue(char* cmd, char* id[])
299 {
300 gboolean ok = FALSE;
302 if (strcmp(cmd, "rm") != 0) {
303 fprintf(stderr, "unknown command %s\n", cmd);
304 return FALSE;
305 }
307 set_euidgid(conf.mail_uid, conf.mail_gid, NULL, NULL);
309 /* privileged users may delete any mail */
310 if (is_privileged_user(conf.orig_uid)) {
311 for (; *id; id++) {
312 fprintf(stderr, "id: %s\n", *id);
313 if (queue_delete(*id)) {
314 ok = TRUE;
315 }
316 }
317 return ok;
318 }
320 struct passwd *pw = getpwuid(conf.orig_uid);
321 if (!pw) {
322 fprintf(stderr, "could not find a passwd entry for uid %d: %s\n",
323 conf.orig_uid, strerror(errno));
324 return FALSE;
325 }
327 /* non-privileged users may only delete their own messages */
328 for (; *id; id++) {
329 message *msg = msg_spool_read(*id, FALSE);
331 fprintf(stderr, "id: %s\n", *id);
333 if (!msg->ident) {
334 fprintf(stderr, "message %s does not have an ident\n", *id);
335 continue;
336 }
337 if (strcmp(pw->pw_name, msg->ident) != 0) {
338 fprintf(stderr, "you do not own message id %s\n", *id);
339 continue;
340 }
342 if ( (msg->received_host || (msg->received_prot != PROT_LOCAL))
343 #ifdef ENABLE_IDENT
344 && !is_in_netlist(msg->received_host, conf.ident_trusted_nets)
345 #endif
346 ) {
347 fprintf(stderr, "message %s was not received locally or from a trusted network\n", *id);
348 continue;
349 }
351 ok = queue_delete(*id);
352 }
353 return ok;
354 }
356 static int
357 run_queue(gboolean do_runq, gboolean do_runq_online, char* route_name)
358 {
359 int ret;
361 /* queue runs */
362 set_identity(conf.orig_uid, "queue run");
364 if (do_runq) {
365 ret = queue_run();
366 }
368 if (do_runq_online) {
369 if (route_name) {
370 conf.online_detect = g_strdup("argument");
371 set_online_name(route_name);
372 }
373 ret = queue_run_online();
374 }
375 return ret;
376 }
378 int
379 main(int argc, char *argv[])
380 {
381 gchar *progname;
382 char* opt;
383 gint arg;
385 mta_mode mta_mode = MODE_ACCEPT;
386 gboolean do_listen = FALSE;
387 gboolean do_runq = FALSE;
388 gboolean do_runq_online = FALSE;
389 gboolean do_queue = FALSE;
390 gint queue_interval = 0;
391 gchar *M_cmd = NULL;
392 gboolean opt_t = FALSE;
393 gboolean opt_i = FALSE;
394 gboolean exit_failure = FALSE;
395 gint exit_code = EXIT_SUCCESS;
396 gchar *conf_file = CONF_FILE;
397 gchar *route_name = NULL;
398 gchar *f_address = NULL;
399 address *return_path = NULL; /* may be changed by -f option */
400 gchar *full_sender_name = NULL;
401 gboolean do_verbose = FALSE;
402 gint debug_level = -1;
404 progname = get_progname(argv[0]);
406 if (strcmp(progname, "mailq") == 0) {
407 mta_mode = MODE_LIST;
408 } else if (strcmp(progname, "mailrm") == 0) {
409 mta_mode = MODE_MCMD;
410 M_cmd = "rm";
411 } else if (strcmp(progname, "runq") == 0) {
412 mta_mode = MODE_RUNQUEUE;
413 do_runq = TRUE;
414 } else if (strcmp(progname, "rmail") == 0) {
415 /* the `rmail' alias should probably be removed now
416 that we have the rmail script. But let's keep it
417 for some while for compatibility. 2010-06-19 */
418 mta_mode = MODE_ACCEPT;
419 opt_i = TRUE;
420 } else if (strcmp(progname, "smtpd") == 0 || strcmp(progname, "in.smtpd") == 0) {
421 mta_mode = MODE_SMTP;
422 }
424 /* parse cmd line */
425 for (arg=1; arg<argc && argv[arg][0]=='-'; arg++) {
426 opt = argv[arg] + 1; /* points to the char after the dash */
428 if (strcmp(opt, "-") == 0) {
429 /* everything after `--' are address arguments */
430 arg++;
431 break;
433 } else if (strcmp(opt, "bd") == 0) {
434 do_listen = TRUE;
435 mta_mode = MODE_DAEMON;
437 } else if (strcmp(opt, "bi") == 0) {
438 /* ignored */
439 mta_mode = MODE_BI;
441 } else if (strcmp(opt, "bs") == 0) {
442 mta_mode = MODE_SMTP;
444 } else if (strcmp(opt, "bp") == 0) {
445 mta_mode = MODE_LIST;
447 } else if (strcmp(opt, "bV") == 0) {
448 mta_mode = MODE_VERSION;
450 } else if (strncmp(opt, "B", 1) == 0) {
451 /* we ignore this and throw the argument away */
452 get_optarg(argv, &arg, opt+1);
454 } else if (strncmp(opt, "C", 1) == 0) {
455 conf_file = get_optarg(argv, &arg, opt+1);
456 if (!conf_file) {
457 fprintf(stderr, "-C requires a filename as argument.\n");
458 exit(EXIT_FAILURE);
459 }
461 } else if (strncmp(opt, "d", 1) == 0) {
462 if (getuid() != 0) {
463 fprintf(stderr, "only root may set the debug level.\n");
464 exit(EXIT_FAILURE);
465 }
466 char *lvl = get_optarg(argv, &arg, opt+1);
467 if (!lvl) {
468 fprintf(stderr, "-d requires a number argument.\n");
469 exit(EXIT_FAILURE);
470 }
471 debug_level = atoi(lvl);
473 } else if (strncmp(opt, "f", 1) == 0) {
474 /* set return path */
475 gchar *address = get_optarg(argv, &arg, opt+1);
476 if (!address) {
477 fprintf(stderr, "-f requires an address argument\n");
478 exit(EXIT_FAILURE);
479 }
480 f_address = g_strdup(address);
482 } else if (strncmp(opt, "F", 1) == 0) {
483 full_sender_name = get_optarg(argv, &arg, opt+1);
484 if (!full_sender_name) {
485 fprintf(stderr, "-F requires a name argument\n");
486 exit(EXIT_FAILURE);
487 }
489 } else if (strcmp(opt, "i") == 0) {
490 opt_i = TRUE;
491 exit_failure = FALSE; /* may override -oem */
493 } else if (strcmp(opt, "m") == 0) {
494 /* ignore -m (me too) switch (see man page) */
496 } else if (strcmp(opt, "Mrm") == 0) {
497 mta_mode = MODE_MCMD;
498 M_cmd = "rm";
500 } else if (strcmp(opt, "odq") == 0) {
501 do_queue = TRUE;
503 } else if (strcmp(opt, "oem") == 0) {
504 if (!opt_i) {
505 /* TODO: Why is this related to -i in any way? */
506 exit_failure = TRUE;
507 }
509 } else if (strcmp(opt, "oi") == 0) {
510 exit_failure = FALSE; /* may override -oem */
512 } else if (strncmp(opt, "o", 1) == 0) {
513 /* ignore all other -oXXX options */
515 } else if (strncmp(opt, "qo", 2) == 0) {
516 mta_mode = MODE_RUNQUEUE;
517 do_runq = FALSE;
518 do_runq_online = TRUE;
519 /* can be NULL, then we use online detection method */
520 route_name = get_optarg(argv, &arg, opt+2);
522 } else if (strncmp(opt, "q", 1) == 0) {
523 /* must be after the `qo' check */
524 gchar *optarg;
526 do_runq = TRUE;
527 mta_mode = MODE_RUNQUEUE;
528 optarg = get_optarg(argv, &arg, opt+1);
529 if (optarg) {
530 /* not just one single queue run but regular runs */
531 mta_mode = MODE_DAEMON;
532 queue_interval = time_interval(optarg);
533 }
535 } else if (strcmp(opt, "t") == 0) {
536 opt_t = TRUE;
538 } else if (strcmp(opt, "v") == 0) {
539 do_verbose = TRUE;
541 } else {
542 fprintf(stderr, "unrecognized option `-%s'\n", opt);
543 exit(EXIT_FAILURE);
544 }
545 }
547 if (mta_mode == MODE_VERSION) {
548 gchar *with_resolver = "";
549 gchar *with_auth = "";
550 gchar *with_ident = "";
552 #ifdef ENABLE_RESOLVER
553 with_resolver = " +resolver";
554 #endif
555 #ifdef ENABLE_AUTH
556 with_auth = " +auth";
557 #endif
558 #ifdef ENABLE_IDENT
559 with_ident = " +ident";
560 #endif
562 printf("%s %s%s%s%s\n", PACKAGE, VERSION, with_resolver, with_auth, with_ident);
564 exit(EXIT_SUCCESS);
565 }
567 /* initialize random generator */
568 srand(time(NULL));
569 /* ignore SIGPIPE signal */
570 signal(SIGPIPE, SIG_IGN);
572 /* close all possibly open file descriptors, except std{in,out,err} */
573 {
574 int i, max_fd = sysconf(_SC_OPEN_MAX);
576 if (max_fd <= 0) {
577 max_fd = 64;
578 }
579 for (i=3; i<max_fd; i++) {
580 close(i);
581 }
582 }
584 init_conf();
586 /* if we are not privileged, and the config file was changed we
587 implicetely set the the run_as_user flag and give up all
588 privileges.
590 So it is possible for a user to run his own daemon without
591 breaking security.
592 */
593 if ((strcmp(conf_file, CONF_FILE) != 0) && (conf.orig_uid != 0)) {
594 conf.run_as_user = TRUE;
595 seteuid(conf.orig_uid);
596 setegid(conf.orig_gid);
597 setuid(conf.orig_uid);
598 setgid(conf.orig_gid);
599 }
601 conf.log_dir = LOG_DIR;
602 logopen();
603 if (!read_conf(conf_file)) {
604 logwrite(LOG_ALERT, "SHUTTING DOWN due to problems reading config\n");
605 exit(5);
606 }
607 logclose();
609 if (do_queue) {
610 conf.do_queue = TRUE;
611 }
612 if (do_verbose) {
613 conf.do_verbose = TRUE;
614 }
615 if (debug_level >= 0) { /* if >= 0, it was given by argument */
616 conf.debug_level = debug_level;
617 }
619 /* It appears that changing to / ensures that we are never in
620 a directory which we cannot access. This situation could be
621 possible after changing identity.
622 Maybe we should only change to / if we not run as user, to
623 allow relative paths for log files in test setups for
624 instance.
625 */
626 chdir("/");
628 if (!conf.run_as_user) {
629 if (setgid(0) != 0) {
630 fprintf(stderr, "could not set gid to 0. Is the setuid bit set? : %s\n", strerror(errno));
631 exit(EXIT_FAILURE);
632 }
633 if (setuid(0) != 0) {
634 fprintf(stderr, "could not gain root privileges. Is the setuid bit set? : %s\n", strerror(errno));
635 exit(EXIT_FAILURE);
636 }
637 }
639 if (!logopen()) {
640 fprintf(stderr, "could not open log file\n");
641 exit(EXIT_FAILURE);
642 }
644 DEBUG(1) debugf("masqmail %s starting\n", VERSION);
646 DEBUG(5) {
647 gchar **str = argv;
648 debugf("args: \n");
649 while (*str) {
650 debugf("%s \n", *str);
651 str++;
652 }
653 }
654 DEBUG(5) debugf("queue_interval = %d\n", queue_interval);
656 if (f_address) {
657 return_path = create_address_qualified(f_address, TRUE, conf.host_name);
658 g_free(f_address);
659 if (!return_path) {
660 fprintf(stderr, "invalid RFC821 address: %s\n", f_address);
661 exit(EXIT_FAILURE);
662 }
663 }
665 switch (mta_mode) {
666 case MODE_DAEMON:
667 mode_daemon(do_listen, queue_interval, argv);
668 break;
670 case MODE_RUNQUEUE:
671 exit(run_queue(do_runq, do_runq_online, route_name) ? 0 : 1);
672 break;
674 case MODE_SMTP:
675 mode_smtp();
676 break;
678 case MODE_LIST:
679 queue_list();
680 break;
682 case MODE_BI:
683 exit(EXIT_SUCCESS);
684 break; /* well... */
686 case MODE_MCMD:
687 exit(manipulate_queue(M_cmd, &argv[arg]) ? 0 : 1);
688 break;
690 case MODE_ACCEPT:
691 {
692 guint accept_flags = (opt_t ? ACC_DEL_RCPTS | ACC_RCPT_FROM_HEAD : 0)
693 | (opt_i ? ACC_DOT_IGNORE : ACC_NODOT_RELAX);
694 mode_accept(return_path, full_sender_name, accept_flags, &(argv[arg]), argc - arg);
695 exit(exit_failure ? EXIT_FAILURE : EXIT_SUCCESS);
696 }
697 break;
698 case MODE_NONE:
699 break;
701 default:
702 fprintf(stderr, "unknown mode: %d\n", mta_mode);
703 break;
704 }
706 logclose();
708 exit(exit_code);
709 }