1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 return store_get((int)size);
49 function_dummy_free(void *block) { block = block; }
52 function_store_malloc(size_t size)
54 return store_malloc((int)size);
58 function_store_free(void *block)
66 /*************************************************
67 * Enums for cmdline interface *
68 *************************************************/
70 enum commandline_info { CMDINFO_NONE=0,
71 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
76 /*************************************************
77 * Compile regular expression and panic on fail *
78 *************************************************/
80 /* This function is called when failure to compile a regular expression leads
81 to a panic exit. In other cases, pcre_compile() is called directly. In many
82 cases where this function is used, the results of the compilation are to be
83 placed in long-lived store, so we temporarily reset the store management
84 functions that PCRE uses if the use_malloc flag is set.
87 pattern the pattern to compile
88 caseless TRUE if caseless matching is required
89 use_malloc TRUE if compile into malloc store
91 Returns: pointer to the compiled pattern
95 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
98 int options = PCRE_COPT;
103 pcre_malloc = function_store_malloc;
104 pcre_free = function_store_free;
106 if (caseless) options |= PCRE_CASELESS;
107 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
108 pcre_malloc = function_store_get;
109 pcre_free = function_dummy_free;
111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
112 "%s at offset %d while compiling %s", error, offset, pattern);
119 /*************************************************
120 * Execute regular expression and set strings *
121 *************************************************/
123 /* This function runs a regular expression match, and sets up the pointers to
124 the matched substrings.
127 re the compiled expression
128 subject the subject string
129 options additional PCRE options
130 setup if < 0 do full setup
131 if >= 0 setup from setup+1 onwards,
132 excluding the full matched string
134 Returns: TRUE or FALSE
138 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
140 int ovector[3*(EXPAND_MAXN+1)];
141 uschar * s = string_copy(subject); /* de-constifying */
142 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
143 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = (setup < 0)? 0 : setup + 1;
150 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
193 /*************************************************
194 * Handler for SIGUSR1 *
195 *************************************************/
197 /* SIGUSR1 causes any exim process to write to the process log details of
198 what it is currently doing. It will only be used if the OS is capable of
199 setting up a handler that causes automatic restarting of any system call
200 that is in progress at the time.
202 This function takes care to be signal-safe.
204 Argument: the signal number (SIGUSR1)
209 usr1_handler(int sig)
213 os_restarting_signal(sig, usr1_handler);
215 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
218 /* If we are already running as the Exim user, try to create it in the
219 current process (assuming spool_directory exists). Otherwise, if we are
220 root, do the creation in an exim:exim subprocess. */
222 int euid = geteuid();
223 if (euid == exim_uid)
224 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
225 else if (euid == root_uid)
226 fd = log_create_as_exim(process_log_path);
229 /* If we are neither exim nor root, or if we failed to create the log file,
230 give up. There is not much useful we can do with errors, since we don't want
231 to disrupt whatever is going on outside the signal handler. */
235 (void)write(fd, process_info, process_info_len);
241 /*************************************************
243 *************************************************/
245 /* This handler is enabled most of the time that Exim is running. The handler
246 doesn't actually get used unless alarm() has been called to set a timer, to
247 place a time limit on a system call of some kind. When the handler is run, it
250 There are some other SIGALRM handlers that are used in special cases when more
251 than just a flag setting is required; for example, when reading a message's
252 input. These are normally set up in the code module that uses them, and the
253 SIGALRM handler is reset to this one afterwards.
255 Argument: the signal value (SIGALRM)
260 sigalrm_handler(int sig)
262 sig = sig; /* Keep picky compilers happy */
264 os_non_restarting_signal(SIGALRM, sigalrm_handler);
269 /*************************************************
270 * Sleep for a fractional time interval *
271 *************************************************/
273 /* This function is called by millisleep() and exim_wait_tick() to wait for a
274 period of time that may include a fraction of a second. The coding is somewhat
275 tedious. We do not expect setitimer() ever to fail, but if it does, the process
276 will wait for ever, so we panic in this instance. (There was a case of this
277 when a bug in a function that calls milliwait() caused it to pass invalid data.
278 That's when I added the check. :-)
280 We assume it to be not worth sleeping for under 100us; this value will
281 require revisiting as hardware advances. This avoids the issue of
282 a zero-valued timer setting meaning "never fire".
284 Argument: an itimerval structure containing the interval
289 milliwait(struct itimerval *itval)
292 sigset_t old_sigmask;
294 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
296 (void)sigemptyset(&sigmask); /* Empty mask */
297 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
298 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
299 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
300 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
301 "setitimer() failed: %s", strerror(errno));
302 (void)sigfillset(&sigmask); /* All signals */
303 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
304 (void)sigsuspend(&sigmask); /* Until SIGALRM */
305 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
311 /*************************************************
312 * Millisecond sleep function *
313 *************************************************/
315 /* The basic sleep() function has a granularity of 1 second, which is too rough
316 in some cases - for example, when using an increasing delay to slow down
319 Argument: number of millseconds
326 struct itimerval itval;
327 itval.it_interval.tv_sec = 0;
328 itval.it_interval.tv_usec = 0;
329 itval.it_value.tv_sec = msec/1000;
330 itval.it_value.tv_usec = (msec % 1000) * 1000;
336 /*************************************************
337 * Compare microsecond times *
338 *************************************************/
345 Returns: -1, 0, or +1
349 exim_tvcmp(struct timeval *t1, struct timeval *t2)
351 if (t1->tv_sec > t2->tv_sec) return +1;
352 if (t1->tv_sec < t2->tv_sec) return -1;
353 if (t1->tv_usec > t2->tv_usec) return +1;
354 if (t1->tv_usec < t2->tv_usec) return -1;
361 /*************************************************
362 * Clock tick wait function *
363 *************************************************/
365 /* Exim uses a time + a pid to generate a unique identifier in two places: its
366 message IDs, and in file names for maildir deliveries. Because some OS now
367 re-use pids within the same second, sub-second times are now being used.
368 However, for absolute certaintly, we must ensure the clock has ticked before
369 allowing the relevant process to complete. At the time of implementation of
370 this code (February 2003), the speed of processors is such that the clock will
371 invariably have ticked already by the time a process has done its job. This
372 function prepares for the time when things are faster - and it also copes with
373 clocks that go backwards.
376 then_tv A timeval which was used to create uniqueness; its usec field
377 has been rounded down to the value of the resolution.
378 We want to be sure the current time is greater than this.
379 resolution The resolution that was used to divide the microseconds
380 (1 for maildir, larger for message ids)
386 exim_wait_tick(struct timeval *then_tv, int resolution)
388 struct timeval now_tv;
389 long int now_true_usec;
391 (void)gettimeofday(&now_tv, NULL);
392 now_true_usec = now_tv.tv_usec;
393 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
395 if (exim_tvcmp(&now_tv, then_tv) <= 0)
397 struct itimerval itval;
398 itval.it_interval.tv_sec = 0;
399 itval.it_interval.tv_usec = 0;
400 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
401 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
403 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
404 negative value for the microseconds is possible only in the case when "now"
405 is more than a second less than "then". That means that itval.it_value.tv_sec
406 is greater than zero. The following correction is therefore safe. */
408 if (itval.it_value.tv_usec < 0)
410 itval.it_value.tv_usec += 1000000;
411 itval.it_value.tv_sec -= 1;
414 DEBUG(D_transport|D_receive)
416 if (!running_in_test_harness)
418 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
419 then_tv->tv_sec, (long) then_tv->tv_usec,
420 now_tv.tv_sec, (long) now_tv.tv_usec);
421 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
422 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
433 /*************************************************
434 * Call fopen() with umask 777 and adjust mode *
435 *************************************************/
437 /* Exim runs with umask(0) so that files created with open() have the mode that
438 is specified in the open() call. However, there are some files, typically in
439 the spool directory, that are created with fopen(). They end up world-writeable
440 if no precautions are taken. Although the spool directory is not accessible to
441 the world, this is an untidiness. So this is a wrapper function for fopen()
442 that sorts out the mode of the created file.
445 filename the file name
446 options the fopen() options
447 mode the required mode
449 Returns: the fopened FILE or NULL
453 modefopen(const uschar *filename, const char *options, mode_t mode)
455 mode_t saved_umask = umask(0777);
456 FILE *f = Ufopen(filename, options);
457 (void)umask(saved_umask);
458 if (f != NULL) (void)fchmod(fileno(f), mode);
465 /*************************************************
466 * Ensure stdin, stdout, and stderr exist *
467 *************************************************/
469 /* Some operating systems grumble if an exec() happens without a standard
470 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
471 file will be opened and will use these fd values, and then some other bit of
472 code will assume, for example, that it can write error messages to stderr.
473 This function ensures that fds 0, 1, and 2 are open if they do not already
474 exist, by connecting them to /dev/null.
476 This function is also used to ensure that std{in,out,err} exist at all times,
477 so that if any library that Exim calls tries to use them, it doesn't crash.
489 for (i = 0; i <= 2; i++)
491 if (fstat(i, &statbuf) < 0 && errno == EBADF)
493 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
494 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
495 string_open_failed(errno, "/dev/null"));
496 if (devnull != i) (void)dup2(devnull, i);
499 if (devnull > 2) (void)close(devnull);
505 /*************************************************
506 * Close unwanted file descriptors for delivery *
507 *************************************************/
509 /* This function is called from a new process that has been forked to deliver
510 an incoming message, either directly, or using exec.
512 We want any smtp input streams to be closed in this new process. However, it
513 has been observed that using fclose() here causes trouble. When reading in -bS
514 input, duplicate copies of messages have been seen. The files will be sharing a
515 file pointer with the parent process, and it seems that fclose() (at least on
516 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
517 least sometimes. Hence we go for closing the underlying file descriptors.
519 If TLS is active, we want to shut down the TLS library, but without molesting
520 the parent's SSL connection.
522 For delivery of a non-SMTP message, we want to close stdin and stdout (and
523 stderr unless debugging) because the calling process might have set them up as
524 pipes and be waiting for them to close before it waits for the submission
525 process to terminate. If they aren't closed, they hold up the calling process
526 until the initial delivery process finishes, which is not what we want.
528 Exception: We do want it for synchronous delivery!
530 And notwithstanding all the above, if D_resolver is set, implying resolver
531 debugging, leave stdout open, because that's where the resolver writes its
534 When we close stderr (which implies we've also closed stdout), we also get rid
535 of any controlling terminal.
547 tls_close(TRUE, FALSE); /* Shut down the TLS library */
549 (void)close(fileno(smtp_in));
550 (void)close(fileno(smtp_out));
555 (void)close(0); /* stdin */
556 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
557 if (debug_selector == 0) /* stderr */
559 if (!synchronous_delivery)
572 /*************************************************
574 *************************************************/
576 /* This function sets a new uid and gid permanently, optionally calling
577 initgroups() to set auxiliary groups. There are some special cases when running
578 Exim in unprivileged modes. In these situations the effective uid will not be
579 root; if we already have the right effective uid/gid, and don't need to
580 initialize any groups, leave things as they are.
585 igflag TRUE if initgroups() wanted
586 msg text to use in debugging output and failure log
588 Returns: nothing; bombs out on failure
592 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
594 uid_t euid = geteuid();
595 gid_t egid = getegid();
597 if (euid == root_uid || euid != uid || egid != gid || igflag)
599 /* At least one OS returns +1 for initgroups failure, so just check for
604 struct passwd *pw = getpwuid(uid);
607 if (initgroups(pw->pw_name, gid) != 0)
608 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
609 (long int)uid, strerror(errno));
611 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
612 "no passwd entry for uid=%ld", (long int)uid);
615 if (setgid(gid) < 0 || setuid(uid) < 0)
617 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
618 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
622 /* Debugging output included uid/gid and all groups */
626 int group_count, save_errno;
627 gid_t group_list[NGROUPS_MAX];
628 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
629 (long int)geteuid(), (long int)getegid(), (long int)getpid());
630 group_count = getgroups(NGROUPS_MAX, group_list);
632 debug_printf(" auxiliary group list:");
636 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
638 else if (group_count < 0)
639 debug_printf(" <error: %s>", strerror(save_errno));
640 else debug_printf(" <none>");
648 /*************************************************
650 *************************************************/
652 /* Exim exits via this function so that it always clears up any open
658 Returns: does not return
666 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
667 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
674 /*************************************************
675 * Extract port from host address *
676 *************************************************/
678 /* Called to extract the port from the values given to -oMa and -oMi.
679 It also checks the syntax of the address, and terminates it before the
680 port data when a port is extracted.
683 address the address, with possible port on the end
685 Returns: the port, or zero if there isn't one
686 bombs out on a syntax error
690 check_port(uschar *address)
692 int port = host_address_extract_port(address);
693 if (string_is_ip_address(address, NULL) == 0)
695 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
703 /*************************************************
704 * Test/verify an address *
705 *************************************************/
707 /* This function is called by the -bv and -bt code. It extracts a working
708 address from a full RFC 822 address. This isn't really necessary per se, but it
709 has the effect of collapsing source routes.
713 flags flag bits for verify_address()
714 exit_value to be set for failures
720 test_address(uschar *s, int flags, int *exit_value)
722 int start, end, domain;
723 uschar *parse_error = NULL;
724 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
728 fprintf(stdout, "syntax error: %s\n", parse_error);
733 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
734 -1, -1, NULL, NULL, NULL);
735 if (rc == FAIL) *exit_value = 2;
736 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
742 /*************************************************
743 * Show supported features *
744 *************************************************/
746 /* This function is called for -bV/--version and for -d to output the optional
747 features of the current Exim binary.
749 Arguments: a FILE for printing
754 show_whats_supported(FILE *f)
758 #ifdef DB_VERSION_STRING
759 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
760 #elif defined(BTREEVERSION) && defined(HASHVERSION)
762 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
764 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
766 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
767 fprintf(f, "Probably ndbm\n");
768 #elif defined(USE_TDB)
769 fprintf(f, "Using tdb\n");
772 fprintf(f, "Probably GDBM (native mode)\n");
774 fprintf(f, "Probably GDBM (compatibility mode)\n");
778 fprintf(f, "Support for:");
779 #ifdef SUPPORT_CRYPTEQ
780 fprintf(f, " crypteq");
783 fprintf(f, " iconv()");
788 #ifdef HAVE_SETCLASSRESOURCES
789 fprintf(f, " use_setclassresources");
798 fprintf(f, " Expand_dlfunc");
800 #ifdef USE_TCP_WRAPPERS
801 fprintf(f, " TCPwrappers");
805 fprintf(f, " GnuTLS");
807 fprintf(f, " OpenSSL");
810 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
811 fprintf(f, " translate_ip_address");
813 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
814 fprintf(f, " move_frozen_messages");
816 #ifdef WITH_CONTENT_SCAN
817 fprintf(f, " Content_Scanning");
822 #ifndef DISABLE_DNSSEC
823 fprintf(f, " DNSSEC");
825 #ifndef DISABLE_EVENT
826 fprintf(f, " Event");
838 fprintf(f, " PROXY");
841 fprintf(f, " SOCKS");
843 #ifdef EXPERIMENTAL_LMDB
844 fprintf(f, " Experimental_LMDB");
846 #ifdef EXPERIMENTAL_QUEUEFILE
847 fprintf(f, " Experimental_QUEUEFILE");
849 #ifdef EXPERIMENTAL_SPF
850 fprintf(f, " Experimental_SPF");
852 #ifdef EXPERIMENTAL_SRS
853 fprintf(f, " Experimental_SRS");
855 #ifdef EXPERIMENTAL_BRIGHTMAIL
856 fprintf(f, " Experimental_Brightmail");
858 #ifdef EXPERIMENTAL_DANE
859 fprintf(f, " Experimental_DANE");
861 #ifdef EXPERIMENTAL_DCC
862 fprintf(f, " Experimental_DCC");
864 #ifdef EXPERIMENTAL_DMARC
865 fprintf(f, " Experimental_DMARC");
867 #ifdef EXPERIMENTAL_DSN_INFO
868 fprintf(f, " Experimental_DSN_info");
872 fprintf(f, "Lookups (built-in):");
873 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
874 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
876 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
879 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
880 fprintf(f, " dbm dbmjz dbmnz");
882 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
883 fprintf(f, " dnsdb");
885 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
886 fprintf(f, " dsearch");
888 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
889 fprintf(f, " ibase");
891 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
892 fprintf(f, " ldap ldapdn ldapm");
894 #ifdef EXPERIMENTAL_LMDB
897 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
898 fprintf(f, " mysql");
900 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
901 fprintf(f, " nis nis0");
903 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
904 fprintf(f, " nisplus");
906 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
907 fprintf(f, " oracle");
909 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
910 fprintf(f, " passwd");
912 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
913 fprintf(f, " pgsql");
915 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
916 fprintf(f, " redis");
918 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
919 fprintf(f, " sqlite");
921 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
922 fprintf(f, " testdb");
924 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
925 fprintf(f, " whoson");
929 fprintf(f, "Authenticators:");
931 fprintf(f, " cram_md5");
933 #ifdef AUTH_CYRUS_SASL
934 fprintf(f, " cyrus_sasl");
937 fprintf(f, " dovecot");
940 fprintf(f, " gsasl");
942 #ifdef AUTH_HEIMDAL_GSSAPI
943 fprintf(f, " heimdal_gssapi");
945 #ifdef AUTH_PLAINTEXT
946 fprintf(f, " plaintext");
956 fprintf(f, "Routers:");
958 fprintf(f, " accept");
960 #ifdef ROUTER_DNSLOOKUP
961 fprintf(f, " dnslookup");
963 #ifdef ROUTER_IPLITERAL
964 fprintf(f, " ipliteral");
966 #ifdef ROUTER_IPLOOKUP
967 fprintf(f, " iplookup");
969 #ifdef ROUTER_MANUALROUTE
970 fprintf(f, " manualroute");
972 #ifdef ROUTER_QUERYPROGRAM
973 fprintf(f, " queryprogram");
975 #ifdef ROUTER_REDIRECT
976 fprintf(f, " redirect");
980 fprintf(f, "Transports:");
981 #ifdef TRANSPORT_APPENDFILE
982 fprintf(f, " appendfile");
983 #ifdef SUPPORT_MAILDIR
984 fprintf(f, "/maildir");
986 #ifdef SUPPORT_MAILSTORE
987 fprintf(f, "/mailstore");
993 #ifdef TRANSPORT_AUTOREPLY
994 fprintf(f, " autoreply");
996 #ifdef TRANSPORT_LMTP
999 #ifdef TRANSPORT_PIPE
1000 fprintf(f, " pipe");
1002 #ifdef EXPERIMENTAL_QUEUEFILE
1003 fprintf(f, " queuefile");
1005 #ifdef TRANSPORT_SMTP
1006 fprintf(f, " smtp");
1010 if (fixed_never_users[0] > 0)
1013 fprintf(f, "Fixed never_users: ");
1014 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1015 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1016 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1019 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1021 /* Everything else is details which are only worth reporting when debugging.
1022 Perhaps the tls_version_report should move into this too. */
1027 /* clang defines __GNUC__ (at least, for me) so test for it first */
1028 #if defined(__clang__)
1029 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1030 #elif defined(__GNUC__)
1031 fprintf(f, "Compiler: GCC [%s]\n",
1035 "? unknown version ?"
1039 fprintf(f, "Compiler: <unknown>\n");
1043 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1044 __GLIBC__, __GLIBC_MINOR__);
1045 if (__GLIBC_PREREQ(2, 1))
1046 fprintf(f, " Runtime: %s\n",
1047 gnu_get_libc_version());
1051 tls_version_report(f);
1054 utf8_version_report(f);
1057 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1058 if (authi->version_report)
1059 (*authi->version_report)(f);
1061 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1062 characters; unless it's an ancient version of PCRE in which case it
1064 #ifndef PCRE_PRERELEASE
1065 # define PCRE_PRERELEASE
1068 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1069 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1071 PCRE_MAJOR, PCRE_MINOR,
1072 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1075 #undef EXPAND_AND_QUOTE
1078 for (i = 0; i < lookup_list_count; i++)
1079 if (lookup_list[i]->version_report)
1080 lookup_list[i]->version_report(f);
1082 #ifdef WHITELIST_D_MACROS
1083 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1085 fprintf(f, "WHITELIST_D_MACROS unset\n");
1087 #ifdef TRUSTED_CONFIG_LIST
1088 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1090 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1097 /*************************************************
1098 * Show auxiliary information about Exim *
1099 *************************************************/
1102 show_exim_information(enum commandline_info request, FILE *stream)
1109 fprintf(stream, "Oops, something went wrong.\n");
1113 "The -bI: flag takes a string indicating which information to provide.\n"
1114 "If the string is not recognised, you'll get this help (on stderr).\n"
1116 " exim -bI:help this information\n"
1117 " exim -bI:dscp dscp value keywords known\n"
1118 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1122 for (pp = exim_sieve_extension_list; *pp; ++pp)
1123 fprintf(stream, "%s\n", *pp);
1126 dscp_list_to_stream(stream);
1132 /*************************************************
1133 * Quote a local part *
1134 *************************************************/
1136 /* This function is used when a sender address or a From: or Sender: header
1137 line is being created from the caller's login, or from an authenticated_id. It
1138 applies appropriate quoting rules for a local part.
1140 Argument: the local part
1141 Returns: the local part, quoted if necessary
1145 local_part_quote(uschar *lpart)
1147 BOOL needs_quote = FALSE;
1152 for (t = lpart; !needs_quote && *t != 0; t++)
1154 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1155 (*t != '.' || t == lpart || t[1] == 0);
1158 if (!needs_quote) return lpart;
1161 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1165 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1168 yield = string_cat(yield, &size, &ptr, lpart);
1171 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1172 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1173 yield = string_catn(yield, &size, &ptr, nq, 1);
1177 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1185 /*************************************************
1186 * Load readline() functions *
1187 *************************************************/
1189 /* This function is called from testing executions that read data from stdin,
1190 but only when running as the calling user. Currently, only -be does this. The
1191 function loads the readline() function library and passes back the functions.
1192 On some systems, it needs the curses library, so load that too, but try without
1193 it if loading fails. All this functionality has to be requested at build time.
1196 fn_readline_ptr pointer to where to put the readline pointer
1197 fn_addhist_ptr pointer to where to put the addhistory function
1199 Returns: the dlopen handle or NULL on failure
1203 set_readline(char * (**fn_readline_ptr)(const char *),
1204 void (**fn_addhist_ptr)(const char *))
1207 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1209 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1210 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1212 if (dlhandle != NULL)
1214 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1215 * char * readline (const char *prompt);
1216 * void add_history (const char *string);
1218 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1219 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1223 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1232 /*************************************************
1233 * Get a line from stdin for testing things *
1234 *************************************************/
1236 /* This function is called when running tests that can take a number of lines
1237 of input (for example, -be and -bt). It handles continuations and trailing
1238 spaces. And prompting and a blank line output on eof. If readline() is in use,
1239 the arguments are non-NULL and provide the relevant functions.
1242 fn_readline readline function or NULL
1243 fn_addhist addhist function or NULL
1245 Returns: pointer to dynamic memory, or NULL at end of file
1249 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1254 uschar *yield = NULL;
1256 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1260 uschar buffer[1024];
1264 char *readline_line = NULL;
1265 if (fn_readline != NULL)
1267 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1268 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1269 p = US readline_line;
1274 /* readline() not in use */
1277 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1281 /* Handle the line */
1283 ss = p + (int)Ustrlen(p);
1284 while (ss > p && isspace(ss[-1])) ss--;
1288 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1291 yield = string_catn(yield, &size, &ptr, p, ss - p);
1294 if (fn_readline != NULL) free(readline_line);
1297 /* yield can only be NULL if ss==p */
1298 if (ss == p || yield[ptr-1] != '\\')
1300 if (yield) yield[ptr] = 0;
1306 if (yield == NULL) printf("\n");
1312 /*************************************************
1313 * Output usage information for the program *
1314 *************************************************/
1316 /* This function is called when there are no recipients
1317 or a specific --help argument was added.
1320 progname information on what name we were called by
1322 Returns: DOES NOT RETURN
1326 exim_usage(uschar *progname)
1329 /* Handle specific program invocation varients */
1330 if (Ustrcmp(progname, US"-mailq") == 0)
1333 "mailq - list the contents of the mail queue\n\n"
1334 "For a list of options, see the Exim documentation.\n");
1338 /* Generic usage - we output this whatever happens */
1340 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1341 "not directly from a shell command line. Options and/or arguments control\n"
1342 "what it does when called. For a list of options, see the Exim documentation.\n");
1349 /*************************************************
1350 * Validate that the macros given are okay *
1351 *************************************************/
1353 /* Typically, Exim will drop privileges if macros are supplied. In some
1354 cases, we want to not do so.
1356 Arguments: opt_D_used - true if the commandline had a "-D" option
1357 Returns: true if trusted, false otherwise
1361 macros_trusted(BOOL opt_D_used)
1363 #ifdef WHITELIST_D_MACROS
1365 uschar *whitelisted, *end, *p, **whites, **w;
1366 int white_count, i, n;
1368 BOOL prev_char_item, found;
1373 #ifndef WHITELIST_D_MACROS
1377 /* We only trust -D overrides for some invoking users:
1378 root, the exim run-time user, the optional config owner user.
1379 I don't know why config-owner would be needed, but since they can own the
1380 config files anyway, there's no security risk to letting them override -D. */
1381 if ( ! ((real_uid == root_uid)
1382 || (real_uid == exim_uid)
1383 #ifdef CONFIGURE_OWNER
1384 || (real_uid == config_uid)
1388 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1392 /* Get a list of macros which are whitelisted */
1393 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1394 prev_char_item = FALSE;
1396 for (p = whitelisted; *p != '\0'; ++p)
1398 if (*p == ':' || isspace(*p))
1403 prev_char_item = FALSE;
1406 if (!prev_char_item)
1407 prev_char_item = TRUE;
1414 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1415 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1420 if (i == white_count)
1422 while (*p != '\0' && p < end)
1428 /* The list of commandline macros should be very short.
1429 Accept the N*M complexity. */
1430 for (m = macros; m; m = m->next) if (m->command_line)
1433 for (w = whites; *w; ++w)
1434 if (Ustrcmp(*w, m->name) == 0)
1441 if (m->replacement == NULL)
1443 len = Ustrlen(m->replacement);
1446 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1447 0, PCRE_EOPT, NULL, 0);
1450 if (n != PCRE_ERROR_NOMATCH)
1451 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1455 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1461 /*************************************************
1462 * Entry point and high-level code *
1463 *************************************************/
1465 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1466 the appropriate action. All the necessary functions are present in the one
1467 binary. I originally thought one should split it up, but it turns out that so
1468 much of the apparatus is needed in each chunk that one might as well just have
1469 it all available all the time, which then makes the coding easier as well.
1472 argc count of entries in argv
1473 argv argument strings, with argv[0] being the program name
1475 Returns: EXIT_SUCCESS if terminated successfully
1476 EXIT_FAILURE otherwise, except when a message has been sent
1477 to the sender, and -oee was given
1481 main(int argc, char **cargv)
1483 uschar **argv = USS cargv;
1484 int arg_receive_timeout = -1;
1485 int arg_smtp_receive_timeout = -1;
1486 int arg_error_handling = error_handling;
1487 int filter_sfd = -1;
1488 int filter_ufd = -1;
1491 int list_queue_option = 0;
1493 int msg_action_arg = -1;
1494 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1495 int queue_only_reason = 0;
1497 int perl_start_option = 0;
1499 int recipients_arg = argc;
1500 int sender_address_domain = 0;
1501 int test_retry_arg = -1;
1502 int test_rewrite_arg = -1;
1503 BOOL arg_queue_only = FALSE;
1504 BOOL bi_option = FALSE;
1505 BOOL checking = FALSE;
1506 BOOL count_queue = FALSE;
1507 BOOL expansion_test = FALSE;
1508 BOOL extract_recipients = FALSE;
1509 BOOL flag_G = FALSE;
1510 BOOL flag_n = FALSE;
1511 BOOL forced_delivery = FALSE;
1512 BOOL f_end_dot = FALSE;
1513 BOOL deliver_give_up = FALSE;
1514 BOOL list_queue = FALSE;
1515 BOOL list_options = FALSE;
1516 BOOL list_config = FALSE;
1517 BOOL local_queue_only;
1519 BOOL one_msg_action = FALSE;
1520 BOOL opt_D_used = FALSE;
1521 BOOL queue_only_set = FALSE;
1522 BOOL receiving_message = TRUE;
1523 BOOL sender_ident_set = FALSE;
1524 BOOL session_local_queue_only;
1526 BOOL removed_privilege = FALSE;
1527 BOOL usage_wanted = FALSE;
1528 BOOL verify_address_mode = FALSE;
1529 BOOL verify_as_sender = FALSE;
1530 BOOL version_printed = FALSE;
1531 uschar *alias_arg = NULL;
1532 uschar *called_as = US"";
1533 uschar *cmdline_syslog_name = NULL;
1534 uschar *start_queue_run_id = NULL;
1535 uschar *stop_queue_run_id = NULL;
1536 uschar *expansion_test_message = NULL;
1537 uschar *ftest_domain = NULL;
1538 uschar *ftest_localpart = NULL;
1539 uschar *ftest_prefix = NULL;
1540 uschar *ftest_suffix = NULL;
1541 uschar *log_oneline = NULL;
1542 uschar *malware_test_file = NULL;
1543 uschar *real_sender_address;
1544 uschar *originator_home = US"/";
1549 struct stat statbuf;
1550 pid_t passed_qr_pid = (pid_t)0;
1551 int passed_qr_pipe = -1;
1552 gid_t group_list[NGROUPS_MAX];
1554 /* For the -bI: flag */
1555 enum commandline_info info_flag = CMDINFO_NONE;
1556 BOOL info_stdout = FALSE;
1558 /* Possible options for -R and -S */
1560 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1562 /* Need to define this in case we need to change the environment in order
1563 to get rid of a bogus time zone. We have to make it char rather than uschar
1564 because some OS define it in /usr/include/unistd.h. */
1566 extern char **environ;
1568 /* If the Exim user and/or group and/or the configuration file owner/group were
1569 defined by ref:name at build time, we must now find the actual uid/gid values.
1570 This is a feature to make the lives of binary distributors easier. */
1572 #ifdef EXIM_USERNAME
1573 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1577 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1581 /* If ref:name uses a number as the name, route_finduser() returns
1582 TRUE with exim_uid set and pw coerced to NULL. */
1584 exim_gid = pw->pw_gid;
1585 #ifndef EXIM_GROUPNAME
1589 "exim: ref:name should specify a usercode, not a group.\n"
1590 "exim: can't let you get away with it unless you also specify a group.\n");
1597 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1603 #ifdef EXIM_GROUPNAME
1604 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1606 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1612 #ifdef CONFIGURE_OWNERNAME
1613 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1615 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1616 CONFIGURE_OWNERNAME);
1621 /* We default the system_filter_user to be the Exim run-time user, as a
1622 sane non-root value. */
1623 system_filter_uid = exim_uid;
1625 #ifdef CONFIGURE_GROUPNAME
1626 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1628 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1629 CONFIGURE_GROUPNAME);
1634 /* In the Cygwin environment, some initialization used to need doing.
1635 It was fudged in by means of this macro; now no longer but we'll leave
1636 it in case of others. */
1642 /* Check a field which is patched when we are running Exim within its
1643 testing harness; do a fast initial check, and then the whole thing. */
1645 running_in_test_harness =
1646 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1648 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1649 at the start of a program; however, it seems that some environments do not
1650 follow this. A "strange" locale can affect the formatting of timestamps, so we
1653 setlocale(LC_ALL, "C");
1655 /* Set up the default handler for timing using alarm(). */
1657 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1659 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1660 because store_malloc writes a log entry on failure. */
1662 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1664 fprintf(stderr, "exim: failed to get store for log buffer\n");
1668 /* Initialize the default log options. */
1670 bits_set(log_selector, log_selector_size, log_default);
1672 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1673 NULL when the daemon is run and the file is closed. We have to use this
1674 indirection, because some systems don't allow writing to the variable "stderr".
1677 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1679 /* Arrange for the PCRE regex library to use our store functions. Note that
1680 the normal calls are actually macros that add additional arguments for
1681 debugging purposes so we have to assign specially constructed functions here.
1682 The default is to use store in the stacking pool, but this is overridden in the
1683 regex_must_compile() function. */
1685 pcre_malloc = function_store_get;
1686 pcre_free = function_dummy_free;
1688 /* Ensure there is a big buffer for temporary use in several places. It is put
1689 in malloc store so that it can be freed for enlargement if necessary. */
1691 big_buffer = store_malloc(big_buffer_size);
1693 /* Set up the handler for the data request signal, and set the initial
1694 descriptive text. */
1696 set_process_info("initializing");
1697 os_restarting_signal(SIGUSR1, usr1_handler);
1699 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1700 in the daemon code. For the rest of Exim's uses, we ignore it. */
1702 signal(SIGHUP, SIG_IGN);
1704 /* We don't want to die on pipe errors as the code is written to handle
1705 the write error instead. */
1707 signal(SIGPIPE, SIG_IGN);
1709 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1710 set to SIG_IGN. This causes subprocesses that complete before the parent
1711 process waits for them not to hang around, so when Exim calls wait(), nothing
1712 is there. The wait() code has been made robust against this, but let's ensure
1713 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1714 ending status. We use sigaction rather than plain signal() on those OS where
1715 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1716 problem on AIX with this.) */
1720 struct sigaction act;
1721 act.sa_handler = SIG_DFL;
1722 sigemptyset(&(act.sa_mask));
1724 sigaction(SIGCHLD, &act, NULL);
1727 signal(SIGCHLD, SIG_DFL);
1730 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1735 /* Set up the version number. Set up the leading 'E' for the external form of
1736 message ids, set the pointer to the internal form, and initialize it to
1737 indicate no message being processed. */
1740 message_id_option[0] = '-';
1741 message_id_external = message_id_option + 1;
1742 message_id_external[0] = 'E';
1743 message_id = message_id_external + 1;
1746 /* Set the umask to zero so that any files Exim creates using open() are
1747 created with the modes that it specifies. NOTE: Files created with fopen() have
1748 a problem, which was not recognized till rather late (February 2006). With this
1749 umask, such files will be world writeable. (They are all content scanning files
1750 in the spool directory, which isn't world-accessible, so this is not a
1751 disaster, but it's untidy.) I don't want to change this overall setting,
1752 however, because it will interact badly with the open() calls. Instead, there's
1753 now a function called modefopen() that fiddles with the umask while calling
1758 /* Precompile the regular expression for matching a message id. Keep this in
1759 step with the code that generates ids in the accept.c module. We need to do
1760 this here, because the -M options check their arguments for syntactic validity
1761 using mac_ismsgid, which uses this. */
1764 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1766 /* Precompile the regular expression that is used for matching an SMTP error
1767 code, possibly extended, at the start of an error message. Note that the
1768 terminating whitespace character is included. */
1771 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1774 #ifdef WHITELIST_D_MACROS
1775 /* Precompile the regular expression used to filter the content of macros
1776 given to -D for permissibility. */
1778 regex_whitelisted_macro =
1779 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1782 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1784 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1785 this seems to be a generally accepted convention, since one finds symbolic
1786 links called "mailq" in standard OS configurations. */
1788 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1789 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1792 receiving_message = FALSE;
1793 called_as = US"-mailq";
1796 /* If the program is called as "rmail" treat it as equivalent to
1797 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1798 i.e. preventing a single dot on a line from terminating the message, and
1799 returning with zero return code, even in cases of error (provided an error
1800 message has been sent). */
1802 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1803 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1806 called_as = US"-rmail";
1807 errors_sender_rc = EXIT_SUCCESS;
1810 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1811 this is a smail convention. */
1813 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1814 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1816 smtp_input = smtp_batched_input = TRUE;
1817 called_as = US"-rsmtp";
1820 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1821 this is a smail convention. */
1823 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1824 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1827 receiving_message = FALSE;
1828 called_as = US"-runq";
1831 /* If the program is called as "newaliases" treat it as equivalent to
1832 "exim -bi"; this is a sendmail convention. */
1834 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1835 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1838 receiving_message = FALSE;
1839 called_as = US"-newaliases";
1842 /* Save the original effective uid for a couple of uses later. It should
1843 normally be root, but in some esoteric environments it may not be. */
1845 original_euid = geteuid();
1847 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1848 to be the same as the real ones. This makes a difference only if Exim is setuid
1849 (or setgid) to something other than root, which could be the case in some
1850 special configurations. */
1852 real_uid = getuid();
1853 real_gid = getgid();
1855 if (real_uid == root_uid)
1857 rv = setgid(real_gid);
1860 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1861 (long int)real_gid, strerror(errno));
1864 rv = setuid(real_uid);
1867 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1868 (long int)real_uid, strerror(errno));
1873 /* If neither the original real uid nor the original euid was root, Exim is
1874 running in an unprivileged state. */
1876 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1878 /* Scan the program's arguments. Some can be dealt with right away; others are
1879 simply recorded for checking and handling afterwards. Do a high-level switch
1880 on the second character (the one after '-'), to save some effort. */
1882 for (i = 1; i < argc; i++)
1884 BOOL badarg = FALSE;
1885 uschar *arg = argv[i];
1889 /* An argument not starting with '-' is the start of a recipients list;
1890 break out of the options-scanning loop. */
1898 /* An option consistion of -- terminates the options */
1900 if (Ustrcmp(arg, "--") == 0)
1902 recipients_arg = i + 1;
1906 /* Handle flagged options */
1908 switchchar = arg[1];
1911 /* Make all -ex options synonymous with -oex arguments, since that
1912 is assumed by various callers. Also make -qR options synonymous with -R
1913 options, as that seems to be required as well. Allow for -qqR too, and
1914 the same for -S options. */
1916 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1917 Ustrncmp(arg+1, "qR", 2) == 0 ||
1918 Ustrncmp(arg+1, "qS", 2) == 0)
1920 switchchar = arg[2];
1923 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1925 switchchar = arg[3];
1927 queue_2stage = TRUE;
1930 /* Make -r synonymous with -f, since it is a documented alias */
1932 else if (arg[1] == 'r') switchchar = 'f';
1934 /* Make -ov synonymous with -v */
1936 else if (Ustrcmp(arg, "-ov") == 0)
1942 /* deal with --option_aliases */
1943 else if (switchchar == '-')
1945 if (Ustrcmp(argrest, "help") == 0)
1947 usage_wanted = TRUE;
1950 else if (Ustrcmp(argrest, "version") == 0)
1957 /* High-level switch on active initial letter */
1962 /* sendmail uses -Ac and -Am to control which .cf file is used;
1965 if (*argrest == '\0') { badarg = TRUE; break; }
1968 BOOL ignore = FALSE;
1973 if (*(argrest + 1) == '\0')
1977 if (!ignore) { badarg = TRUE; break; }
1981 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1982 so has no need of it. */
1985 if (*argrest == 0) i++; /* Skip over the type */
1990 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1992 /* -bd: Run in daemon mode, awaiting SMTP connections.
1993 -bdf: Ditto, but in the foreground.
1996 if (*argrest == 'd')
1998 daemon_listen = TRUE;
1999 if (*(++argrest) == 'f') background_daemon = FALSE;
2000 else if (*argrest != 0) { badarg = TRUE; break; }
2003 /* -be: Run in expansion test mode
2004 -bem: Ditto, but read a message from a file first
2007 else if (*argrest == 'e')
2009 expansion_test = checking = TRUE;
2010 if (argrest[1] == 'm')
2012 if (++i >= argc) { badarg = TRUE; break; }
2013 expansion_test_message = argv[i];
2016 if (argrest[1] != 0) { badarg = TRUE; break; }
2019 /* -bF: Run system filter test */
2021 else if (*argrest == 'F')
2023 filter_test |= checking = FTEST_SYSTEM;
2024 if (*(++argrest) != 0) { badarg = TRUE; break; }
2025 if (++i < argc) filter_test_sfile = argv[i]; else
2027 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2032 /* -bf: Run user filter test
2033 -bfd: Set domain for filter testing
2034 -bfl: Set local part for filter testing
2035 -bfp: Set prefix for filter testing
2036 -bfs: Set suffix for filter testing
2039 else if (*argrest == 'f')
2041 if (*(++argrest) == 0)
2043 filter_test |= checking = FTEST_USER;
2044 if (++i < argc) filter_test_ufile = argv[i]; else
2046 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2054 fprintf(stderr, "exim: string expected after %s\n", arg);
2057 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2058 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2059 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2060 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2061 else { badarg = TRUE; break; }
2065 /* -bh: Host checking - an IP address must follow. */
2067 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2069 if (++i >= argc) { badarg = TRUE; break; }
2070 sender_host_address = argv[i];
2071 host_checking = checking = log_testing_mode = TRUE;
2072 host_checking_callout = argrest[1] == 'c';
2073 message_logs = FALSE;
2076 /* -bi: This option is used by sendmail to initialize *the* alias file,
2077 though it has the -oA option to specify a different file. Exim has no
2078 concept of *the* alias file, but since Sun's YP make script calls
2079 sendmail this way, some support must be provided. */
2081 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2083 /* -bI: provide information, of the type to follow after a colon.
2084 This is an Exim flag. */
2086 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2088 uschar *p = &argrest[2];
2089 info_flag = CMDINFO_HELP;
2092 if (strcmpic(p, CUS"sieve") == 0)
2094 info_flag = CMDINFO_SIEVE;
2097 else if (strcmpic(p, CUS"dscp") == 0)
2099 info_flag = CMDINFO_DSCP;
2102 else if (strcmpic(p, CUS"help") == 0)
2109 /* -bm: Accept and deliver message - the default option. Reinstate
2110 receiving_message, which got turned off for all -b options. */
2112 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2114 /* -bmalware: test the filename given for malware */
2116 else if (Ustrcmp(argrest, "malware") == 0)
2118 if (++i >= argc) { badarg = TRUE; break; }
2120 malware_test_file = argv[i];
2123 /* -bnq: For locally originating messages, do not qualify unqualified
2124 addresses. In the envelope, this causes errors; in header lines they
2127 else if (Ustrcmp(argrest, "nq") == 0)
2129 allow_unqualified_sender = FALSE;
2130 allow_unqualified_recipient = FALSE;
2133 /* -bpxx: List the contents of the mail queue, in various forms. If
2134 the option is -bpc, just a queue count is needed. Otherwise, if the
2135 first letter after p is r, then order is random. */
2137 else if (*argrest == 'p')
2139 if (*(++argrest) == 'c')
2142 if (*(++argrest) != 0) badarg = TRUE;
2146 if (*argrest == 'r')
2148 list_queue_option = 8;
2151 else list_queue_option = 0;
2155 /* -bp: List the contents of the mail queue, top-level only */
2157 if (*argrest == 0) {}
2159 /* -bpu: List the contents of the mail queue, top-level undelivered */
2161 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2163 /* -bpa: List the contents of the mail queue, including all delivered */
2165 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2167 /* Unknown after -bp[r] */
2177 /* -bP: List the configuration variables given as the address list.
2178 Force -v, so configuration errors get displayed. */
2180 else if (Ustrcmp(argrest, "P") == 0)
2182 /* -bP config: we need to setup here, because later,
2183 * when list_options is checked, the config is read already */
2184 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2187 readconf_save_config(version_string);
2191 list_options = TRUE;
2192 debug_selector |= D_v;
2193 debug_file = stderr;
2197 /* -brt: Test retry configuration lookup */
2199 else if (Ustrcmp(argrest, "rt") == 0)
2202 test_retry_arg = i + 1;
2206 /* -brw: Test rewrite configuration */
2208 else if (Ustrcmp(argrest, "rw") == 0)
2211 test_rewrite_arg = i + 1;
2215 /* -bS: Read SMTP commands on standard input, but produce no replies -
2216 all errors are reported by sending messages. */
2218 else if (Ustrcmp(argrest, "S") == 0)
2219 smtp_input = smtp_batched_input = receiving_message = TRUE;
2221 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2222 on standard output. */
2224 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2226 /* -bt: address testing mode */
2228 else if (Ustrcmp(argrest, "t") == 0)
2229 address_test_mode = checking = log_testing_mode = TRUE;
2231 /* -bv: verify addresses */
2233 else if (Ustrcmp(argrest, "v") == 0)
2234 verify_address_mode = checking = log_testing_mode = TRUE;
2236 /* -bvs: verify sender addresses */
2238 else if (Ustrcmp(argrest, "vs") == 0)
2240 verify_address_mode = checking = log_testing_mode = TRUE;
2241 verify_as_sender = TRUE;
2244 /* -bV: Print version string and support details */
2246 else if (Ustrcmp(argrest, "V") == 0)
2248 printf("Exim version %s #%s built %s\n", version_string,
2249 version_cnumber, version_date);
2250 printf("%s\n", CS version_copyright);
2251 version_printed = TRUE;
2252 show_whats_supported(stdout);
2253 log_testing_mode = TRUE;
2256 /* -bw: inetd wait mode, accept a listening socket as stdin */
2258 else if (*argrest == 'w')
2260 inetd_wait_mode = TRUE;
2261 background_daemon = FALSE;
2262 daemon_listen = TRUE;
2263 if (*(++argrest) != '\0')
2265 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2266 if (inetd_wait_timeout <= 0)
2268 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2278 /* -C: change configuration file list; ignore if it isn't really
2279 a change! Enforce a prefix check if required. */
2284 if(++i < argc) argrest = argv[i]; else
2285 { badarg = TRUE; break; }
2287 if (Ustrcmp(config_main_filelist, argrest) != 0)
2289 #ifdef ALT_CONFIG_PREFIX
2291 int len = Ustrlen(ALT_CONFIG_PREFIX);
2292 uschar *list = argrest;
2294 while((filename = string_nextinlist(&list, &sep, big_buffer,
2295 big_buffer_size)) != NULL)
2297 if ((Ustrlen(filename) < len ||
2298 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2299 Ustrstr(filename, "/../") != NULL) &&
2300 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2302 fprintf(stderr, "-C Permission denied\n");
2307 if (real_uid != root_uid)
2309 #ifdef TRUSTED_CONFIG_LIST
2311 if (real_uid != exim_uid
2312 #ifdef CONFIGURE_OWNER
2313 && real_uid != config_uid
2316 trusted_config = FALSE;
2319 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2322 struct stat statbuf;
2324 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2325 (statbuf.st_uid != root_uid /* owner not root */
2326 #ifdef CONFIGURE_OWNER
2327 && statbuf.st_uid != config_uid /* owner not the special one */
2330 (statbuf.st_gid != root_gid /* group not root */
2331 #ifdef CONFIGURE_GROUP
2332 && statbuf.st_gid != config_gid /* group not the special one */
2334 && (statbuf.st_mode & 020) != 0 /* group writeable */
2336 (statbuf.st_mode & 2) != 0) /* world writeable */
2338 trusted_config = FALSE;
2343 /* Well, the trust list at least is up to scratch... */
2344 void *reset_point = store_get(0);
2345 uschar *trusted_configs[32];
2349 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2351 uschar *start = big_buffer, *nl;
2352 while (*start && isspace(*start))
2356 nl = Ustrchr(start, '\n');
2359 trusted_configs[nr_configs++] = string_copy(start);
2360 if (nr_configs == 32)
2368 const uschar *list = argrest;
2370 while (trusted_config && (filename = string_nextinlist(&list,
2371 &sep, big_buffer, big_buffer_size)) != NULL)
2373 for (i=0; i < nr_configs; i++)
2375 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2378 if (i == nr_configs)
2380 trusted_config = FALSE;
2384 store_reset(reset_point);
2388 /* No valid prefixes found in trust_list file. */
2389 trusted_config = FALSE;
2395 /* Could not open trust_list file. */
2396 trusted_config = FALSE;
2400 /* Not root; don't trust config */
2401 trusted_config = FALSE;
2405 config_main_filelist = argrest;
2406 config_changed = TRUE;
2411 /* -D: set up a macro definition */
2414 #ifdef DISABLE_D_OPTION
2415 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2422 uschar *s = argrest;
2425 while (isspace(*s)) s++;
2427 if (*s < 'A' || *s > 'Z')
2429 fprintf(stderr, "exim: macro name set by -D must start with "
2430 "an upper case letter\n");
2434 while (isalnum(*s) || *s == '_')
2436 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2440 if (ptr == 0) { badarg = TRUE; break; }
2441 while (isspace(*s)) s++;
2444 if (*s++ != '=') { badarg = TRUE; break; }
2445 while (isspace(*s)) s++;
2448 for (m = macros; m; m = m->next)
2449 if (Ustrcmp(m->name, name) == 0)
2451 fprintf(stderr, "exim: duplicated -D in command line\n");
2455 m = macro_create(name, s, TRUE, FALSE);
2457 if (clmacro_count >= MAX_CLMACROS)
2459 fprintf(stderr, "exim: too many -D options on command line\n");
2462 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2468 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2469 The latter is now a no-op, retained for compatibility only. If -dd is used,
2470 debugging subprocesses of the daemon is disabled. */
2473 if (Ustrcmp(argrest, "ropcr") == 0)
2475 /* drop_cr = TRUE; */
2478 /* Use an intermediate variable so that we don't set debugging while
2479 decoding the debugging bits. */
2483 unsigned int selector = D_default;
2486 if (*argrest == 'd')
2488 debug_daemon = TRUE;
2492 decode_bits(&selector, 1, debug_notall, argrest,
2493 debug_options, debug_options_count, US"debug", 0);
2494 debug_selector = selector;
2499 /* -E: This is a local error message. This option is not intended for
2500 external use at all, but is not restricted to trusted callers because it
2501 does no harm (just suppresses certain error messages) and if Exim is run
2502 not setuid root it won't always be trusted when it generates error
2503 messages using this option. If there is a message id following -E, point
2504 message_reference at it, for logging. */
2507 local_error_message = TRUE;
2508 if (mac_ismsgid(argrest)) message_reference = argrest;
2512 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2513 option, so it looks as if historically the -oex options are also callable
2514 without the leading -o. So we have to accept them. Before the switch,
2515 anything starting -oe has been converted to -e. Exim does not support all
2516 of the sendmail error options. */
2519 if (Ustrcmp(argrest, "e") == 0)
2521 arg_error_handling = ERRORS_SENDER;
2522 errors_sender_rc = EXIT_SUCCESS;
2524 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2525 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2526 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2527 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2532 /* -F: Set sender's full name, used instead of the gecos entry from
2533 the password file. Since users can usually alter their gecos entries,
2534 there's no security involved in using this instead. The data can follow
2535 the -F or be in the next argument. */
2540 if(++i < argc) argrest = argv[i]; else
2541 { badarg = TRUE; break; }
2543 originator_name = argrest;
2544 sender_name_forced = TRUE;
2548 /* -f: Set sender's address - this value is only actually used if Exim is
2549 run by a trusted user, or if untrusted_set_sender is set and matches the
2550 address, except that the null address can always be set by any user. The
2551 test for this happens later, when the value given here is ignored when not
2552 permitted. For an untrusted user, the actual sender is still put in Sender:
2553 if it doesn't match the From: header (unless no_local_from_check is set).
2554 The data can follow the -f or be in the next argument. The -r switch is an
2555 obsolete form of -f but since there appear to be programs out there that
2556 use anything that sendmail has ever supported, better accept it - the
2557 synonymizing is done before the switch above.
2559 At this stage, we must allow domain literal addresses, because we don't
2560 know what the setting of allow_domain_literals is yet. Ditto for trailing
2561 dots and strip_trailing_dot. */
2565 int dummy_start, dummy_end;
2569 if (i+1 < argc) argrest = argv[++i]; else
2570 { badarg = TRUE; break; }
2573 sender_address = string_sprintf(""); /* Ensure writeable memory */
2576 uschar *temp = argrest + Ustrlen(argrest) - 1;
2577 while (temp >= argrest && isspace(*temp)) temp--;
2578 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2579 allow_domain_literals = TRUE;
2580 strip_trailing_dot = TRUE;
2582 allow_utf8_domains = TRUE;
2584 sender_address = parse_extract_address(argrest, &errmess,
2585 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2587 message_smtputf8 = string_is_utf8(sender_address);
2588 allow_utf8_domains = FALSE;
2590 allow_domain_literals = FALSE;
2591 strip_trailing_dot = FALSE;
2592 if (sender_address == NULL)
2594 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2595 return EXIT_FAILURE;
2598 sender_address_forced = TRUE;
2602 /* -G: sendmail invocation to specify that it's a gateway submission and
2603 sendmail may complain about problems instead of fixing them.
2604 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2605 not at this time complain about problems. */
2611 /* -h: Set the hop count for an incoming message. Exim does not currently
2612 support this; it always computes it by counting the Received: headers.
2613 To put it in will require a change to the spool header file format. */
2618 if(++i < argc) argrest = argv[i]; else
2619 { badarg = TRUE; break; }
2621 if (!isdigit(*argrest)) badarg = TRUE;
2625 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2626 not to be documented for sendmail but mailx (at least) uses it) */
2629 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2633 /* -L: set the identifier used for syslog; equivalent to setting
2634 syslog_processname in the config file, but needs to be an admin option. */
2637 if (*argrest == '\0')
2639 if(++i < argc) argrest = argv[i]; else
2640 { badarg = TRUE; break; }
2642 sz = Ustrlen(argrest);
2645 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2646 return EXIT_FAILURE;
2650 fprintf(stderr, "exim: the -L syslog name is too short\n");
2651 return EXIT_FAILURE;
2653 cmdline_syslog_name = argrest;
2657 receiving_message = FALSE;
2659 /* -MC: continue delivery of another message via an existing open
2660 file descriptor. This option is used for an internal call by the
2661 smtp transport when there is a pending message waiting to go to an
2662 address to which it has got a connection. Five subsequent arguments are
2663 required: transport name, host name, IP address, sequence number, and
2664 message_id. Transports may decline to create new processes if the sequence
2665 number gets too big. The channel is stdin. This (-MC) must be the last
2666 argument. There's a subsequent check that the real-uid is privileged.
2668 If we are running in the test harness. delay for a bit, to let the process
2669 that set this one up complete. This makes for repeatability of the logging,
2672 if (Ustrcmp(argrest, "C") == 0)
2674 union sockaddr_46 interface_sock;
2675 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2679 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2680 return EXIT_FAILURE;
2683 if (msg_action_arg >= 0)
2685 fprintf(stderr, "exim: incompatible arguments\n");
2686 return EXIT_FAILURE;
2689 continue_transport = argv[++i];
2690 continue_hostname = argv[++i];
2691 continue_host_address = argv[++i];
2692 continue_sequence = Uatoi(argv[++i]);
2693 msg_action = MSG_DELIVER;
2694 msg_action_arg = ++i;
2695 forced_delivery = TRUE;
2696 queue_run_pid = passed_qr_pid;
2697 queue_run_pipe = passed_qr_pipe;
2699 if (!mac_ismsgid(argv[i]))
2701 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2703 return EXIT_FAILURE;
2706 /* Set up $sending_ip_address and $sending_port */
2708 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2710 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2714 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2716 return EXIT_FAILURE;
2719 if (running_in_test_harness) millisleep(500);
2723 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2727 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2728 precedes -MC (see above). The flag indicates that the host to which
2729 Exim is connected has accepted an AUTH sequence. */
2731 case 'A': smtp_authenticated = TRUE; break;
2733 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2734 that exim is connected to supports the esmtp extension DSN */
2736 case 'D': smtp_peer_options |= PEER_OFFERED_DSN; break;
2738 /* -MCG: set the queue name, to a non-default value */
2740 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2744 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2746 case 'K': smtp_peer_options |= PEER_OFFERED_CHUNKING; break;
2748 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2749 it preceded -MC (see above) */
2751 case 'P': smtp_peer_options |= PEER_OFFERED_PIPE; break;
2753 /* -MCQ: pass on the pid of the queue-running process that started
2754 this chain of deliveries and the fd of its synchronizing pipe; this
2755 is useful only when it precedes -MC (see above) */
2757 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2759 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2763 /* -MCS: set the smtp_use_size flag; this is useful only when it
2764 precedes -MC (see above) */
2766 case 'S': smtp_peer_options |= PEER_OFFERED_SIZE; break;
2769 /* -MCT: set the tls_offered flag; this is useful only when it
2770 precedes -MC (see above). The flag indicates that the host to which
2771 Exim is connected has offered TLS support. */
2773 case 'T': smtp_peer_options |= PEER_OFFERED_TLS; break;
2776 default: badarg = TRUE; break;
2781 /* -M[x]: various operations on the following list of message ids:
2782 -M deliver the messages, ignoring next retry times and thawing
2783 -Mc deliver the messages, checking next retry times, no thawing
2784 -Mf freeze the messages
2785 -Mg give up on the messages
2786 -Mt thaw the messages
2787 -Mrm remove the messages
2788 In the above cases, this must be the last option. There are also the
2789 following options which are followed by a single message id, and which
2790 act on that message. Some of them use the "recipient" addresses as well.
2791 -Mar add recipient(s)
2792 -Mmad mark all recipients delivered
2793 -Mmd mark recipients(s) delivered
2795 -Mset load a message for use with -be
2797 -Mvc show copy (of whole message, in RFC 2822 format)
2802 else if (*argrest == 0)
2804 msg_action = MSG_DELIVER;
2805 forced_delivery = deliver_force_thaw = TRUE;
2807 else if (Ustrcmp(argrest, "ar") == 0)
2809 msg_action = MSG_ADD_RECIPIENT;
2810 one_msg_action = TRUE;
2812 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2813 else if (Ustrcmp(argrest, "es") == 0)
2815 msg_action = MSG_EDIT_SENDER;
2816 one_msg_action = TRUE;
2818 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2819 else if (Ustrcmp(argrest, "g") == 0)
2821 msg_action = MSG_DELIVER;
2822 deliver_give_up = TRUE;
2824 else if (Ustrcmp(argrest, "mad") == 0)
2826 msg_action = MSG_MARK_ALL_DELIVERED;
2828 else if (Ustrcmp(argrest, "md") == 0)
2830 msg_action = MSG_MARK_DELIVERED;
2831 one_msg_action = TRUE;
2833 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2834 else if (Ustrcmp(argrest, "set") == 0)
2836 msg_action = MSG_LOAD;
2837 one_msg_action = TRUE;
2839 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2840 else if (Ustrcmp(argrest, "vb") == 0)
2842 msg_action = MSG_SHOW_BODY;
2843 one_msg_action = TRUE;
2845 else if (Ustrcmp(argrest, "vc") == 0)
2847 msg_action = MSG_SHOW_COPY;
2848 one_msg_action = TRUE;
2850 else if (Ustrcmp(argrest, "vh") == 0)
2852 msg_action = MSG_SHOW_HEADER;
2853 one_msg_action = TRUE;
2855 else if (Ustrcmp(argrest, "vl") == 0)
2857 msg_action = MSG_SHOW_LOG;
2858 one_msg_action = TRUE;
2860 else { badarg = TRUE; break; }
2862 /* All the -Mxx options require at least one message id. */
2864 msg_action_arg = i + 1;
2865 if (msg_action_arg >= argc)
2867 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2868 return EXIT_FAILURE;
2871 /* Some require only message ids to follow */
2873 if (!one_msg_action)
2876 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2878 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2880 return EXIT_FAILURE;
2882 goto END_ARG; /* Remaining args are ids */
2885 /* Others require only one message id, possibly followed by addresses,
2886 which will be handled as normal arguments. */
2890 if (!mac_ismsgid(argv[msg_action_arg]))
2892 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2893 argv[msg_action_arg], arg);
2894 return EXIT_FAILURE;
2901 /* Some programs seem to call the -om option without the leading o;
2902 for sendmail it askes for "me too". Exim always does this. */
2905 if (*argrest != 0) badarg = TRUE;
2909 /* -N: don't do delivery - a debugging option that stops transports doing
2910 their thing. It implies debugging at the D_v level. */
2915 dont_deliver = TRUE;
2916 debug_selector |= D_v;
2917 debug_file = stderr;
2923 /* -n: This means "don't alias" in sendmail, apparently.
2924 For normal invocations, it has no effect.
2925 It may affect some other options. */
2931 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2932 option to the specified value. This form uses long names. We need to handle
2933 -O option=value and -Ooption=value. */
2940 fprintf(stderr, "exim: string expected after -O\n");
2948 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2951 if (*argrest == 'A')
2953 alias_arg = argrest + 1;
2954 if (alias_arg[0] == 0)
2956 if (i+1 < argc) alias_arg = argv[++i]; else
2958 fprintf(stderr, "exim: string expected after -oA\n");
2964 /* -oB: Set a connection message max value for remote deliveries */
2966 else if (*argrest == 'B')
2968 uschar *p = argrest + 1;
2971 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2973 connection_max_messages = 1;
2982 fprintf(stderr, "exim: number expected after -oB\n");
2985 connection_max_messages = Uatoi(p);
2989 /* -odb: background delivery */
2991 else if (Ustrcmp(argrest, "db") == 0)
2993 synchronous_delivery = FALSE;
2994 arg_queue_only = FALSE;
2995 queue_only_set = TRUE;
2998 /* -odf: foreground delivery (smail-compatible option); same effect as
2999 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3002 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
3004 synchronous_delivery = TRUE;
3005 arg_queue_only = FALSE;
3006 queue_only_set = TRUE;
3009 /* -odq: queue only */
3011 else if (Ustrcmp(argrest, "dq") == 0)
3013 synchronous_delivery = FALSE;
3014 arg_queue_only = TRUE;
3015 queue_only_set = TRUE;
3018 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3019 but no remote delivery */
3021 else if (Ustrcmp(argrest, "dqs") == 0)
3024 arg_queue_only = FALSE;
3025 queue_only_set = TRUE;
3028 /* -oex: Sendmail error flags. As these are also accepted without the
3029 leading -o prefix, for compatibility with vacation and other callers,
3030 they are handled with -e above. */
3032 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3033 -oitrue: Another sendmail syntax for the same */
3035 else if (Ustrcmp(argrest, "i") == 0 ||
3036 Ustrcmp(argrest, "itrue") == 0)
3039 /* -oM*: Set various characteristics for an incoming message; actually
3040 acted on for trusted callers only. */
3042 else if (*argrest == 'M')
3046 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3050 /* -oMa: Set sender host address */
3052 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3054 /* -oMaa: Set authenticator name */
3056 else if (Ustrcmp(argrest, "Maa") == 0)
3057 sender_host_authenticated = argv[++i];
3059 /* -oMas: setting authenticated sender */
3061 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3063 /* -oMai: setting authenticated id */
3065 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3067 /* -oMi: Set incoming interface address */
3069 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3071 /* -oMm: Message reference */
3073 else if (Ustrcmp(argrest, "Mm") == 0)
3075 if (!mac_ismsgid(argv[i+1]))
3077 fprintf(stderr,"-oMm must be a valid message ID\n");
3080 if (!trusted_config)
3082 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3085 message_reference = argv[++i];
3088 /* -oMr: Received protocol */
3090 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3092 /* -oMs: Set sender host name */
3094 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3096 /* -oMt: Set sender ident */
3098 else if (Ustrcmp(argrest, "Mt") == 0)
3100 sender_ident_set = TRUE;
3101 sender_ident = argv[++i];
3104 /* Else a bad argument */
3113 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3114 seem to call this as -m (undocumented), so that is also accepted (see
3117 else if (Ustrcmp(argrest, "m") == 0) {}
3119 /* -oo: An ancient flag for old-style addresses which still seems to
3120 crop up in some calls (see in SCO). */
3122 else if (Ustrcmp(argrest, "o") == 0) {}
3124 /* -oP <name>: set pid file path for daemon */
3126 else if (Ustrcmp(argrest, "P") == 0)
3127 override_pid_file_path = argv[++i];
3129 /* -or <n>: set timeout for non-SMTP acceptance
3130 -os <n>: set timeout for SMTP acceptance */
3132 else if (*argrest == 'r' || *argrest == 's')
3134 int *tp = (*argrest == 'r')?
3135 &arg_receive_timeout : &arg_smtp_receive_timeout;
3136 if (argrest[1] == 0)
3138 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3140 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3143 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3148 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3150 else if (Ustrcmp(argrest, "X") == 0)
3151 override_local_interfaces = argv[++i];
3153 /* Unknown -o argument */
3159 /* -ps: force Perl startup; -pd force delayed Perl startup */
3163 if (*argrest == 's' && argrest[1] == 0)
3165 perl_start_option = 1;
3168 if (*argrest == 'd' && argrest[1] == 0)
3170 perl_start_option = -1;
3175 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3176 which sets the host protocol and host name */
3180 if (i+1 < argc) argrest = argv[++i]; else
3181 { badarg = TRUE; break; }
3186 uschar *hn = Ustrchr(argrest, ':');
3189 received_protocol = argrest;
3193 received_protocol = string_copyn(argrest, hn - argrest);
3194 sender_host_name = hn + 1;
3201 receiving_message = FALSE;
3202 if (queue_interval >= 0)
3204 fprintf(stderr, "exim: -q specified more than once\n");
3208 /* -qq...: Do queue runs in a 2-stage manner */
3210 if (*argrest == 'q')
3212 queue_2stage = TRUE;
3216 /* -qi...: Do only first (initial) deliveries */
3218 if (*argrest == 'i')
3220 queue_run_first_delivery = TRUE;
3224 /* -qf...: Run the queue, forcing deliveries
3225 -qff..: Ditto, forcing thawing as well */
3227 if (*argrest == 'f')
3229 queue_run_force = TRUE;
3230 if (*++argrest == 'f')
3232 deliver_force_thaw = TRUE;
3237 /* -q[f][f]l...: Run the queue only on local deliveries */
3239 if (*argrest == 'l')
3241 queue_run_local = TRUE;
3245 /* -q[f][f][l][G<name>]... Work on the named queue */
3247 if (*argrest == 'G')
3250 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3251 queue_name = string_copyn(argrest, i);
3253 if (*argrest == '/') argrest++;
3256 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3257 only, optionally named, optionally starting from a given message id. */
3259 if (*argrest == 0 &&
3260 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3263 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3264 start_queue_run_id = argv[++i];
3265 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3266 stop_queue_run_id = argv[++i];
3269 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3270 forced, optionally local only, optionally named. */
3272 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3275 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3281 case 'R': /* Synonymous with -qR... */
3282 receiving_message = FALSE;
3284 /* -Rf: As -R (below) but force all deliveries,
3285 -Rff: Ditto, but also thaw all frozen messages,
3286 -Rr: String is regex
3287 -Rrf: Regex and force
3288 -Rrff: Regex and force and thaw
3290 in all cases provided there are no further characters in this
3296 for (i = 0; i < nelem(rsopts); i++)
3297 if (Ustrcmp(argrest, rsopts[i]) == 0)
3299 if (i != 2) queue_run_force = TRUE;
3300 if (i >= 2) deliver_selectstring_regex = TRUE;
3301 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3302 argrest += Ustrlen(rsopts[i]);
3306 /* -R: Set string to match in addresses for forced queue run to
3307 pick out particular messages. */
3310 deliver_selectstring = argrest;
3311 else if (i+1 < argc)
3312 deliver_selectstring = argv[++i];
3315 fprintf(stderr, "exim: string expected after -R\n");
3321 /* -r: an obsolete synonym for -f (see above) */
3324 /* -S: Like -R but works on sender. */
3326 case 'S': /* Synonymous with -qS... */
3327 receiving_message = FALSE;
3329 /* -Sf: As -S (below) but force all deliveries,
3330 -Sff: Ditto, but also thaw all frozen messages,
3331 -Sr: String is regex
3332 -Srf: Regex and force
3333 -Srff: Regex and force and thaw
3335 in all cases provided there are no further characters in this
3341 for (i = 0; i < nelem(rsopts); i++)
3342 if (Ustrcmp(argrest, rsopts[i]) == 0)
3344 if (i != 2) queue_run_force = TRUE;
3345 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3346 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3347 argrest += Ustrlen(rsopts[i]);
3351 /* -S: Set string to match in addresses for forced queue run to
3352 pick out particular messages. */
3355 deliver_selectstring_sender = argrest;
3356 else if (i+1 < argc)
3357 deliver_selectstring_sender = argv[++i];
3360 fprintf(stderr, "exim: string expected after -S\n");
3365 /* -Tqt is an option that is exclusively for use by the testing suite.
3366 It is not recognized in other circumstances. It allows for the setting up
3367 of explicit "queue times" so that various warning/retry things can be
3368 tested. Otherwise variability of clock ticks etc. cause problems. */
3371 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3372 fudged_queue_times = argv[++i];
3377 /* -t: Set flag to extract recipients from body of message. */
3380 if (*argrest == 0) extract_recipients = TRUE;
3382 /* -ti: Set flag to extract recipients from body of message, and also
3383 specify that dot does not end the message. */
3385 else if (Ustrcmp(argrest, "i") == 0)
3387 extract_recipients = TRUE;
3391 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3394 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3401 /* -U: This means "initial user submission" in sendmail, apparently. The
3402 doc claims that in future sendmail may refuse syntactically invalid
3403 messages instead of fixing them. For the moment, we just ignore it. */
3409 /* -v: verify things - this is a very low-level debugging */
3414 debug_selector |= D_v;
3415 debug_file = stderr;
3421 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3423 The -x flag tells the sendmail command that mail from a local
3424 mail program has National Language Support (NLS) extended characters
3425 in the body of the mail item. The sendmail command can send mail with
3426 extended NLS characters across networks that normally corrupts these
3429 As Exim is 8-bit clean, it just ignores this flag. */
3432 if (*argrest != 0) badarg = TRUE;
3435 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3436 logs to that file. We swallow the parameter and otherwise ignore it. */
3439 if (*argrest == '\0')
3442 fprintf(stderr, "exim: string expected after -X\n");
3448 if (*argrest == '\0')
3449 if (++i < argc) log_oneline = argv[i]; else
3451 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3456 /* All other initial characters are errors */
3461 } /* End of high-level switch statement */
3463 /* Failed to recognize the option, or syntax error */
3467 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3468 "option %s\n", arg);
3474 /* If -R or -S have been specified without -q, assume a single queue run. */
3476 if ( (deliver_selectstring || deliver_selectstring_sender)
3477 && queue_interval < 0)
3482 /* If usage_wanted is set we call the usage function - which never returns */
3483 if (usage_wanted) exim_usage(called_as);
3485 /* Arguments have been processed. Check for incompatibilities. */
3487 (smtp_input || extract_recipients || recipients_arg < argc) &&
3488 (daemon_listen || queue_interval >= 0 || bi_option ||
3489 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3490 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3493 msg_action_arg > 0 &&
3494 (daemon_listen || queue_interval > 0 || list_options ||
3495 (checking && msg_action != MSG_LOAD) ||
3496 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3499 (daemon_listen || queue_interval > 0) &&
3500 (sender_address != NULL || list_options || list_queue || checking ||
3504 daemon_listen && queue_interval == 0
3507 inetd_wait_mode && queue_interval >= 0
3511 (checking || smtp_input || extract_recipients ||
3512 filter_test != FTEST_NONE || bi_option)
3515 verify_address_mode &&
3516 (address_test_mode || smtp_input || extract_recipients ||
3517 filter_test != FTEST_NONE || bi_option)
3520 address_test_mode && (smtp_input || extract_recipients ||
3521 filter_test != FTEST_NONE || bi_option)
3524 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3528 deliver_selectstring != NULL && queue_interval < 0
3531 msg_action == MSG_LOAD &&
3532 (!expansion_test || expansion_test_message != NULL)
3536 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3540 /* If debugging is set up, set the file and the file descriptor to pass on to
3541 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3542 to run in the foreground. */
3544 if (debug_selector != 0)
3546 debug_file = stderr;
3547 debug_fd = fileno(debug_file);
3548 background_daemon = FALSE;
3549 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3550 if (debug_selector != D_v) /* -v only doesn't show this */
3552 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3553 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3555 if (!version_printed)
3556 show_whats_supported(stderr);
3560 /* When started with root privilege, ensure that the limits on the number of
3561 open files and the number of processes (where that is accessible) are
3562 sufficiently large, or are unset, in case Exim has been called from an
3563 environment where the limits are screwed down. Not all OS have the ability to
3564 change some of these limits. */
3568 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3574 #ifdef RLIMIT_NOFILE
3575 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3577 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3579 rlp.rlim_cur = rlp.rlim_max = 0;
3582 /* I originally chose 1000 as a nice big number that was unlikely to
3583 be exceeded. It turns out that some older OS have a fixed upper limit of
3586 if (rlp.rlim_cur < 1000)
3588 rlp.rlim_cur = rlp.rlim_max = 1000;
3589 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3591 rlp.rlim_cur = rlp.rlim_max = 256;
3592 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3593 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3600 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3602 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3604 rlp.rlim_cur = rlp.rlim_max = 0;
3607 #ifdef RLIM_INFINITY
3608 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3610 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3612 if (rlp.rlim_cur < 1000)
3614 rlp.rlim_cur = rlp.rlim_max = 1000;
3616 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3617 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3623 /* Exim is normally entered as root (but some special configurations are
3624 possible that don't do this). However, it always spins off sub-processes that
3625 set their uid and gid as required for local delivery. We don't want to pass on
3626 any extra groups that root may belong to, so we want to get rid of them all at
3629 We need to obey setgroups() at this stage, before possibly giving up root
3630 privilege for a changed configuration file, but later on we might need to
3631 check on the additional groups for the admin user privilege - can't do that
3632 till after reading the config, which might specify the exim gid. Therefore,
3633 save the group list here first. */
3635 group_count = getgroups(NGROUPS_MAX, group_list);
3636 if (group_count < 0)
3638 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3642 /* There is a fundamental difference in some BSD systems in the matter of
3643 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3644 known not to be different. On the "different" systems there is a single group
3645 list, and the first entry in it is the current group. On all other versions of
3646 Unix there is a supplementary group list, which is in *addition* to the current
3647 group. Consequently, to get rid of all extraneous groups on a "standard" system
3648 you pass over 0 groups to setgroups(), while on a "different" system you pass
3649 over a single group - the current group, which is always the first group in the
3650 list. Calling setgroups() with zero groups on a "different" system results in
3651 an error return. The following code should cope with both types of system.
3653 However, if this process isn't running as root, setgroups() can't be used
3654 since you have to be root to run it, even if throwing away groups. Not being
3655 root here happens only in some unusual configurations. We just ignore the
3658 if (setgroups(0, NULL) != 0)
3660 if (setgroups(1, group_list) != 0 && !unprivileged)
3662 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3667 /* If the configuration file name has been altered by an argument on the
3668 command line (either a new file name or a macro definition) and the caller is
3669 not root, or if this is a filter testing run, remove any setuid privilege the
3670 program has and run as the underlying user.
3672 The exim user is locked out of this, which severely restricts the use of -C
3675 Otherwise, set the real ids to the effective values (should be root unless run
3676 from inetd, which it can either be root or the exim uid, if one is configured).
3678 There is a private mechanism for bypassing some of this, in order to make it
3679 possible to test lots of configurations automatically, without having either to
3680 recompile each time, or to patch in an actual configuration file name and other
3681 values (such as the path name). If running in the test harness, pretend that
3682 configuration file changes and macro definitions haven't happened. */
3685 (!trusted_config || /* Config changed, or */
3686 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3687 real_uid != root_uid && /* Not root, and */
3688 !running_in_test_harness /* Not fudged */
3690 expansion_test /* expansion testing */
3692 filter_test != FTEST_NONE) /* Filter testing */
3694 setgroups(group_count, group_list);
3695 exim_setugid(real_uid, real_gid, FALSE,
3696 US"-C, -D, -be or -bf forces real uid");
3697 removed_privilege = TRUE;
3699 /* In the normal case when Exim is called like this, stderr is available
3700 and should be used for any logging information because attempts to write
3701 to the log will usually fail. To arrange this, we unset really_exim. However,
3702 if no stderr is available there is no point - we might as well have a go
3703 at the log (if it fails, syslog will be written).
3705 Note that if the invoker is Exim, the logs remain available. Messing with
3706 this causes unlogged successful deliveries. */
3708 if ((log_stderr != NULL) && (real_uid != exim_uid))
3709 really_exim = FALSE;
3712 /* Privilege is to be retained for the moment. It may be dropped later,
3713 depending on the job that this Exim process has been asked to do. For now, set
3714 the real uid to the effective so that subsequent re-execs of Exim are done by a
3717 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3719 /* If testing a filter, open the file(s) now, before wasting time doing other
3720 setups and reading the message. */
3722 if ((filter_test & FTEST_SYSTEM) != 0)
3724 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3727 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3729 return EXIT_FAILURE;
3733 if ((filter_test & FTEST_USER) != 0)
3735 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3738 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3740 return EXIT_FAILURE;
3744 /* Initialise lookup_list
3745 If debugging, already called above via version reporting.
3746 In either case, we initialise the list of available lookups while running
3747 as root. All dynamically modules are loaded from a directory which is
3748 hard-coded into the binary and is code which, if not a module, would be
3749 part of Exim already. Ability to modify the content of the directory
3750 is equivalent to the ability to modify a setuid binary!
3752 This needs to happen before we read the main configuration. */
3756 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3759 /* Read the main runtime configuration data; this gives up if there
3760 is a failure. It leaves the configuration file open so that the subsequent
3761 configuration data for delivery can be read if needed.
3763 NOTE: immediatly after opening the configuration file we change the working
3764 directory to "/"! Later we change to $spool_directory. We do it there, because
3765 during readconf_main() some expansion takes place already. */
3767 /* Store the initial cwd before we change directories */
3768 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3770 perror("exim: can't get the current working directory");
3775 -be[m] expansion test -
3776 -b[fF] filter test new
3778 -bmalware malware_test_file new
3780 -brw rewrite test new
3782 -bv[s] address verify -
3784 -bP <option> (except -bP config, which sets list_config)
3786 If any of these options is set, we suppress warnings about configuration
3787 issues (currently about tls_advertise_hosts and keep_environment not being
3790 readconf_main(checking || list_options);
3792 /* Now in directory "/" */
3794 if (cleanup_environment() == FALSE)
3795 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3798 /* If an action on specific messages is requested, or if a daemon or queue
3799 runner is being started, we need to know if Exim was called by an admin user.
3800 This is the case if the real user is root or exim, or if the real group is
3801 exim, or if one of the supplementary groups is exim or a group listed in
3802 admin_groups. We don't fail all message actions immediately if not admin_user,
3803 since some actions can be performed by non-admin users. Instead, set admin_user
3804 for later interrogation. */
3806 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3811 for (i = 0; i < group_count; i++)
3813 if (group_list[i] == exim_gid) admin_user = TRUE;
3814 else if (admin_groups != NULL)
3816 for (j = 1; j <= (int)(admin_groups[0]); j++)
3817 if (admin_groups[j] == group_list[i])
3818 { admin_user = TRUE; break; }
3820 if (admin_user) break;
3824 /* Another group of privileged users are the trusted users. These are root,
3825 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3826 are permitted to specify sender_addresses with -f on the command line, and
3827 other message parameters as well. */
3829 if (real_uid == root_uid || real_uid == exim_uid)
3830 trusted_caller = TRUE;
3835 if (trusted_users != NULL)
3837 for (i = 1; i <= (int)(trusted_users[0]); i++)
3838 if (trusted_users[i] == real_uid)
3839 { trusted_caller = TRUE; break; }
3842 if (!trusted_caller && trusted_groups != NULL)
3844 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3846 if (trusted_groups[i] == real_gid)
3847 trusted_caller = TRUE;
3848 else for (j = 0; j < group_count; j++)
3850 if (trusted_groups[i] == group_list[j])
3851 { trusted_caller = TRUE; break; }
3853 if (trusted_caller) break;
3858 /* Handle the decoding of logging options. */
3860 decode_bits(log_selector, log_selector_size, log_notall,
3861 log_selector_string, log_options, log_options_count, US"log", 0);
3866 debug_printf("configuration file is %s\n", config_main_filename);
3867 debug_printf("log selectors =");
3868 for (i = 0; i < log_selector_size; i++)
3869 debug_printf(" %08x", log_selector[i]);
3873 /* If domain literals are not allowed, check the sender address that was
3874 supplied with -f. Ditto for a stripped trailing dot. */
3876 if (sender_address != NULL)
3878 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3880 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3881 "allowed\n", sender_address);
3882 return EXIT_FAILURE;
3884 if (f_end_dot && !strip_trailing_dot)
3886 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3887 "(trailing dot not allowed)\n", sender_address);
3888 return EXIT_FAILURE;
3892 /* See if an admin user overrode our logging. */
3894 if (cmdline_syslog_name != NULL)
3898 syslog_processname = cmdline_syslog_name;
3899 log_file_path = string_copy(CUS"syslog");
3903 /* not a panic, non-privileged users should not be able to spam paniclog */
3905 "exim: you lack sufficient privilege to specify syslog process name\n");
3906 return EXIT_FAILURE;
3910 /* Paranoia check of maximum lengths of certain strings. There is a check
3911 on the length of the log file path in log.c, which will come into effect
3912 if there are any calls to write the log earlier than this. However, if we
3913 get this far but the string is very long, it is better to stop now than to
3914 carry on and (e.g.) receive a message and then have to collapse. The call to
3915 log_write() from here will cause the ultimate panic collapse if the complete
3916 file name exceeds the buffer length. */
3918 if (Ustrlen(log_file_path) > 200)
3919 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3920 "log_file_path is longer than 200 chars: aborting");
3922 if (Ustrlen(pid_file_path) > 200)
3923 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3924 "pid_file_path is longer than 200 chars: aborting");
3926 if (Ustrlen(spool_directory) > 200)
3927 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3928 "spool_directory is longer than 200 chars: aborting");
3930 /* Length check on the process name given to syslog for its TAG field,
3931 which is only permitted to be 32 characters or less. See RFC 3164. */
3933 if (Ustrlen(syslog_processname) > 32)
3934 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3935 "syslog_processname is longer than 32 chars: aborting");
3940 log_write(0, LOG_MAIN, "%s", log_oneline);
3941 return EXIT_SUCCESS;
3944 return EXIT_FAILURE;
3946 /* In some operating systems, the environment variable TMPDIR controls where
3947 temporary files are created; Exim doesn't use these (apart from when delivering
3948 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3949 If TMPDIR is found in the environment, reset it to the value defined in the
3950 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3951 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3952 EXIM_TMPDIR by the build scripts.
3958 if (environ) for (p = USS environ; *p; p++)
3959 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3961 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3962 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3964 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3969 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3970 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3971 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3972 called by a user who has set the TZ variable. This then affects the timestamps
3973 in log files and in Received: headers, and any created Date: header lines. The
3974 required timezone is settable in the configuration file, so nothing can be done
3975 about this earlier - but hopefully nothing will normally be logged earlier than
3976 this. We have to make a new environment if TZ is wrong, but don't bother if
3977 timestamps_utc is set, because then all times are in UTC anyway. */
3979 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3980 timestamps_utc = TRUE;
3983 uschar *envtz = US getenv("TZ");
3985 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3986 : timezone_string != NULL
3989 uschar **p = USS environ;
3993 if (environ) while (*p++) count++;
3994 if (!envtz) count++;
3995 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3996 if (environ) for (p = USS environ; *p; p++)
3997 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3998 if (timezone_string)
4000 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4001 sprintf(CS *newp++, "TZ=%s", timezone_string);
4006 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4007 tod_stamp(tod_log));
4011 /* Handle the case when we have removed the setuid privilege because of -C or
4012 -D. This means that the caller of Exim was not root.
4014 There is a problem if we were running as the Exim user. The sysadmin may
4015 expect this case to retain privilege because "the binary was called by the
4016 Exim user", but it hasn't, because either the -D option set macros, or the
4017 -C option set a non-trusted configuration file. There are two possibilities:
4019 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4020 to do message deliveries. Thus, the fact that it is running as a
4021 non-privileged user is plausible, and might be wanted in some special
4022 configurations. However, really_exim will have been set false when
4023 privilege was dropped, to stop Exim trying to write to its normal log
4024 files. Therefore, re-enable normal log processing, assuming the sysadmin
4025 has set up the log directory correctly.
4027 (2) If deliver_drop_privilege is not set, the configuration won't work as
4028 apparently intended, and so we log a panic message. In order to retain
4029 root for -C or -D, the caller must either be root or be invoking a
4030 trusted configuration file (when deliver_drop_privilege is false). */
4032 if ( removed_privilege
4033 && (!trusted_config || opt_D_used)
4034 && real_uid == exim_uid)
4035 if (deliver_drop_privilege)
4036 really_exim = TRUE; /* let logging work normally */
4038 log_write(0, LOG_MAIN|LOG_PANIC,
4039 "exim user lost privilege for using %s option",
4040 trusted_config? "-D" : "-C");
4042 /* Start up Perl interpreter if Perl support is configured and there is a
4043 perl_startup option, and the configuration or the command line specifies
4044 initializing starting. Note that the global variables are actually called
4045 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4048 if (perl_start_option != 0)
4049 opt_perl_at_start = (perl_start_option > 0);
4050 if (opt_perl_at_start && opt_perl_startup != NULL)
4053 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4054 errstr = init_perl(opt_perl_startup);
4057 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4058 return EXIT_FAILURE;
4060 opt_perl_started = TRUE;
4062 #endif /* EXIM_PERL */
4064 /* Log the arguments of the call if the configuration file said so. This is
4065 a debugging feature for finding out what arguments certain MUAs actually use.
4066 Don't attempt it if logging is disabled, or if listing variables or if
4067 verifying/testing addresses or expansions. */
4069 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4070 && really_exim && !list_options && !checking)
4073 uschar *p = big_buffer;
4074 Ustrcpy(p, "cwd= (failed)");
4076 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4079 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4081 for (i = 0; i < argc; i++)
4083 int len = Ustrlen(argv[i]);
4084 const uschar *printing;
4086 if (p + len + 8 >= big_buffer + big_buffer_size)
4089 log_write(0, LOG_MAIN, "%s", big_buffer);
4090 Ustrcpy(big_buffer, "...");
4093 printing = string_printing(argv[i]);
4094 if (printing[0] == 0) quote = US"\""; else
4096 const uschar *pp = printing;
4098 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4100 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4101 (p - big_buffer) - 4), printing, quote);
4105 if (LOGGING(arguments))
4106 log_write(0, LOG_MAIN, "%s", big_buffer);
4108 debug_printf("%s\n", big_buffer);
4111 /* Set the working directory to be the top-level spool directory. We don't rely
4112 on this in the code, which always uses fully qualified names, but it's useful
4113 for core dumps etc. Don't complain if it fails - the spool directory might not
4114 be generally accessible and calls with the -C option (and others) have lost
4115 privilege by now. Before the chdir, we try to ensure that the directory exists.
4118 if (Uchdir(spool_directory) != 0)
4121 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4122 dummy = /* quieten compiler */ Uchdir(spool_directory);
4125 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4126 alias file. Exim doesn't have such a concept, but this call is screwed into
4127 Sun's YP makefiles. Handle this by calling a configured script, as the real
4128 user who called Exim. The -oA option can be used to pass an argument to the
4133 (void)fclose(config_file);
4134 if (bi_command != NULL)
4138 argv[i++] = bi_command;
4139 if (alias_arg != NULL) argv[i++] = alias_arg;
4142 setgroups(group_count, group_list);
4143 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4145 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4146 (argv[1] == NULL)? US"" : argv[1]);
4148 execv(CS argv[0], (char *const *)argv);
4149 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4154 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4159 /* We moved the admin/trusted check to be immediately after reading the
4160 configuration file. We leave these prints here to ensure that syslog setup,
4161 logfile setup, and so on has already happened. */
4163 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4164 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4166 /* Only an admin user may start the daemon or force a queue run in the default
4167 configuration, but the queue run restriction can be relaxed. Only an admin
4168 user may request that a message be returned to its sender forthwith. Only an
4169 admin user may specify a debug level greater than D_v (because it might show
4170 passwords, etc. in lookup queries). Only an admin user may request a queue
4171 count. Only an admin user can use the test interface to scan for email
4172 (because Exim will be in the spool dir and able to look at mails). */
4176 BOOL debugset = (debug_selector & ~D_v) != 0;
4177 if (deliver_give_up || daemon_listen || malware_test_file ||
4178 (count_queue && queue_list_requires_admin) ||
4179 (list_queue && queue_list_requires_admin) ||
4180 (queue_interval >= 0 && prod_requires_admin) ||
4181 (debugset && !running_in_test_harness))
4183 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4188 /* If the real user is not root or the exim uid, the argument for passing
4189 in an open TCP/IP connection for another message is not permitted, nor is
4190 running with the -N option for any delivery action, unless this call to exim is
4191 one that supplied an input message, or we are using a patched exim for
4192 regression testing. */
4194 if (real_uid != root_uid && real_uid != exim_uid &&
4195 (continue_hostname != NULL ||
4197 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4198 )) && !running_in_test_harness)
4200 fprintf(stderr, "exim: Permission denied\n");
4201 return EXIT_FAILURE;
4204 /* If the caller is not trusted, certain arguments are ignored when running for
4205 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4206 Note that authority for performing certain actions on messages is tested in the
4207 queue_action() function. */
4209 if (!trusted_caller && !checking)
4211 sender_host_name = sender_host_address = interface_address =
4212 sender_ident = received_protocol = NULL;
4213 sender_host_port = interface_port = 0;
4214 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4217 /* If a sender host address is set, extract the optional port number off the
4218 end of it and check its syntax. Do the same thing for the interface address.
4219 Exim exits if the syntax is bad. */
4223 if (sender_host_address != NULL)
4224 sender_host_port = check_port(sender_host_address);
4225 if (interface_address != NULL)
4226 interface_port = check_port(interface_address);
4229 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4234 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4235 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4239 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4240 return EXIT_FAILURE;
4244 /* If an SMTP message is being received check to see if the standard input is a
4245 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4246 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4251 union sockaddr_46 inetd_sock;
4252 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4253 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4255 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4256 if (family == AF_INET || family == AF_INET6)
4258 union sockaddr_46 interface_sock;
4259 size = sizeof(interface_sock);
4261 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4262 interface_address = host_ntoa(-1, &interface_sock, NULL,
4265 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4267 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4270 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4271 NULL, &sender_host_port);
4272 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4273 "inetd is not supported when mua_wrapper is set");
4278 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4279 return EXIT_FAILURE;
4285 /* If the load average is going to be needed while receiving a message, get it
4286 now for those OS that require the first call to os_getloadavg() to be done as
4287 root. There will be further calls later for each message received. */
4289 #ifdef LOAD_AVG_NEEDS_ROOT
4290 if (receiving_message &&
4291 (queue_only_load >= 0 ||
4292 (is_inetd && smtp_load_reserve >= 0)
4295 load_average = OS_GETLOADAVG();
4299 /* The queue_only configuration option can be overridden by -odx on the command
4300 line, except that if queue_only_override is false, queue_only cannot be unset
4301 from the command line. */
4303 if (queue_only_set && (queue_only_override || arg_queue_only))
4304 queue_only = arg_queue_only;
4306 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4309 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4310 if (arg_smtp_receive_timeout >= 0)
4311 smtp_receive_timeout = arg_smtp_receive_timeout;
4313 /* If Exim was started with root privilege, unless we have already removed the
4314 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4315 except when starting the daemon or doing some kind of delivery or address
4316 testing (-bt). These are the only cases when root need to be retained. We run
4317 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4318 retained only for starting the daemon. We always do the initgroups() in this
4319 situation (controlled by the TRUE below), in order to be as close as possible
4320 to the state Exim usually runs in. */
4322 if (!unprivileged && /* originally had root AND */
4323 !removed_privilege && /* still got root AND */
4324 !daemon_listen && /* not starting the daemon */
4325 queue_interval <= 0 && /* (either kind of daemon) */
4327 deliver_drop_privilege || /* requested unprivileged */
4329 queue_interval < 0 && /* not running the queue */
4330 (msg_action_arg < 0 || /* and */
4331 msg_action != MSG_DELIVER) && /* not delivering and */
4332 (!checking || !address_test_mode) /* not address checking */
4336 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4339 /* When we are retaining a privileged uid, we still change to the exim gid. */
4344 rv = setgid(exim_gid);
4345 /* Impact of failure is that some stuff might end up with an incorrect group.
4346 We track this for failures from root, since any attempt to change privilege
4347 by root should succeed and failures should be examined. For non-root,
4348 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4349 no need to complain then. */
4352 if (!(unprivileged || removed_privilege))
4355 "exim: changing group failed: %s\n", strerror(errno));
4359 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4360 (long int)exim_gid, strerror(errno));
4364 /* Handle a request to scan a file for malware */
4365 if (malware_test_file)
4367 #ifdef WITH_CONTENT_SCAN
4369 set_process_info("scanning file for malware");
4370 result = malware_in_file(malware_test_file);
4373 printf("No malware found.\n");
4378 printf("Malware lookup returned non-okay/fail: %d\n", result);
4382 printf("Malware found: %s\n", malware_name);
4384 printf("Malware scan detected malware of unknown name.\n");
4386 printf("Malware scanning not enabled at compile time.\n");
4391 /* Handle a request to list the delivery queue */
4395 set_process_info("listing the queue");
4396 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4400 /* Handle a request to count the delivery queue */
4404 set_process_info("counting the queue");
4409 /* Handle actions on specific messages, except for the force delivery and
4410 message load actions, which are done below. Some actions take a whole list of
4411 message ids, which are known to continue up to the end of the arguments. Others
4412 take a single message id and then operate on the recipients list. */
4414 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4416 int yield = EXIT_SUCCESS;
4417 set_process_info("acting on specified messages");
4419 if (!one_msg_action)
4421 for (i = msg_action_arg; i < argc; i++)
4422 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4423 yield = EXIT_FAILURE;
4426 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4427 recipients_arg)) yield = EXIT_FAILURE;
4431 /* We used to set up here to skip reading the ACL section, on
4432 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4433 Now, since the intro of the ${acl } expansion, ACL definitions may be
4434 needed in transports so we lost the optimisation. */
4438 /* The configuration data will have been read into POOL_PERM because we won't
4439 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4440 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4441 configuration were read into POOL_MAIN, because we don't do any resets till
4442 later on. However, it seems right, and it does ensure that both pools get used.
4445 store_pool = POOL_MAIN;
4447 /* Handle the -brt option. This is for checking out retry configurations.
4448 The next three arguments are a domain name or a complete address, and
4449 optionally two error numbers. All it does is to call the function that
4450 scans the retry configuration data. */
4452 if (test_retry_arg >= 0)
4454 retry_config *yield;
4455 int basic_errno = 0;
4459 if (test_retry_arg >= argc)
4461 printf("-brt needs a domain or address argument\n");
4462 exim_exit(EXIT_FAILURE);
4464 s1 = argv[test_retry_arg++];
4467 /* If the first argument contains no @ and no . it might be a local user
4468 or it might be a single-component name. Treat as a domain. */
4470 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4472 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4473 "being \ntreated as a one-component domain, not as a local part.\n\n",
4477 /* There may be an optional second domain arg. */
4479 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4480 s2 = argv[test_retry_arg++];
4482 /* The final arg is an error name */
4484 if (test_retry_arg < argc)
4486 uschar *ss = argv[test_retry_arg];
4488 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4491 printf("%s\n", CS error);
4492 return EXIT_FAILURE;
4495 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4496 code > 100 as an error is for matching codes to the decade. Turn them into
4497 a real error code, off the decade. */
4499 if (basic_errno == ERRNO_MAIL4XX ||
4500 basic_errno == ERRNO_RCPT4XX ||
4501 basic_errno == ERRNO_DATA4XX)
4503 int code = (more_errno >> 8) & 255;
4505 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4506 else if (code > 100)
4507 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4511 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4512 if (yield == NULL) printf("No retry information found\n"); else
4515 more_errno = yield->more_errno;
4516 printf("Retry rule: %s ", yield->pattern);
4518 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4520 printf("quota%s%s ",
4521 (more_errno > 0)? "_" : "",
4522 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4524 else if (yield->basic_errno == ECONNREFUSED)
4526 printf("refused%s%s ",
4527 (more_errno > 0)? "_" : "",
4528 (more_errno == 'M')? "MX" :
4529 (more_errno == 'A')? "A" : "");
4531 else if (yield->basic_errno == ETIMEDOUT)
4534 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4536 if (more_errno != 0) printf("_%s",
4537 (more_errno == 'M')? "MX" : "A");
4540 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4541 printf("auth_failed ");
4544 for (r = yield->rules; r != NULL; r = r->next)
4546 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4547 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4553 printf(",%d.", x/1000);
4567 exim_exit(EXIT_SUCCESS);
4570 /* Handle a request to list one or more configuration options */
4571 /* If -n was set, we suppress some information */
4575 set_process_info("listing variables");
4576 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4577 else for (i = recipients_arg; i < argc; i++)
4580 (Ustrcmp(argv[i], "router") == 0 ||
4581 Ustrcmp(argv[i], "transport") == 0 ||
4582 Ustrcmp(argv[i], "authenticator") == 0 ||
4583 Ustrcmp(argv[i], "macro") == 0 ||
4584 Ustrcmp(argv[i], "environment") == 0))
4586 readconf_print(argv[i+1], argv[i], flag_n);
4589 else readconf_print(argv[i], NULL, flag_n);
4591 exim_exit(EXIT_SUCCESS);
4596 set_process_info("listing config");
4597 readconf_print(US"config", NULL, flag_n);
4598 exim_exit(EXIT_SUCCESS);
4602 /* Initialise subsystems as required */
4603 #ifndef DISABLE_DKIM
4609 /* Handle a request to deliver one or more messages that are already on the
4610 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4611 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4613 Delivery of specific messages is typically used for a small number when
4614 prodding by hand (when the option forced_delivery will be set) or when
4615 re-execing to regain root privilege. Each message delivery must happen in a
4616 separate process, so we fork a process for each one, and run them sequentially
4617 so that debugging output doesn't get intertwined, and to avoid spawning too
4618 many processes if a long list is given. However, don't fork for the last one;
4619 this saves a process in the common case when Exim is called to deliver just one
4622 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4624 if (prod_requires_admin && !admin_user)
4626 fprintf(stderr, "exim: Permission denied\n");
4627 exim_exit(EXIT_FAILURE);
4629 set_process_info("delivering specified messages");
4630 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4631 for (i = msg_action_arg; i < argc; i++)
4636 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4637 else if ((pid = fork()) == 0)
4639 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4640 _exit(EXIT_SUCCESS);
4644 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4646 exim_exit(EXIT_FAILURE);
4650 exim_exit(EXIT_SUCCESS);
4654 /* If only a single queue run is requested, without SMTP listening, we can just
4655 turn into a queue runner, with an optional starting message id. */
4657 if (queue_interval == 0 && !daemon_listen)
4659 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4660 (start_queue_run_id == NULL)? US"" : US" starting at ",
4661 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4662 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4663 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4665 set_process_info("running the '%s' queue (single queue run)", queue_name);
4667 set_process_info("running the queue (single queue run)");
4668 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4669 exim_exit(EXIT_SUCCESS);
4673 /* Find the login name of the real user running this process. This is always
4674 needed when receiving a message, because it is written into the spool file. It
4675 may also be used to construct a from: or a sender: header, and in this case we
4676 need the user's full name as well, so save a copy of it, checked for RFC822
4677 syntax and munged if necessary, if it hasn't previously been set by the -F
4678 argument. We may try to get the passwd entry more than once, in case NIS or
4679 other delays are in evidence. Save the home directory for use in filter testing
4684 if ((pw = getpwuid(real_uid)) != NULL)
4686 originator_login = string_copy(US pw->pw_name);
4687 originator_home = string_copy(US pw->pw_dir);
4689 /* If user name has not been set by -F, set it from the passwd entry
4690 unless -f has been used to set the sender address by a trusted user. */
4692 if (originator_name == NULL)
4694 if (sender_address == NULL ||
4695 (!trusted_caller && filter_test == FTEST_NONE))
4697 uschar *name = US pw->pw_gecos;
4698 uschar *amp = Ustrchr(name, '&');
4701 /* Most Unix specify that a '&' character in the gecos field is
4702 replaced by a copy of the login name, and some even specify that
4703 the first character should be upper cased, so that's what we do. */
4708 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4709 amp - name, name, &loffset, originator_login, amp + 1);
4710 buffer[loffset] = toupper(buffer[loffset]);
4714 /* If a pattern for matching the gecos field was supplied, apply
4715 it and then expand the name string. */
4717 if (gecos_pattern != NULL && gecos_name != NULL)
4720 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4722 if (regex_match_and_setup(re, name, 0, -1))
4724 uschar *new_name = expand_string(gecos_name);
4726 if (new_name != NULL)
4728 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4729 "gecos field \"%s\"\n", new_name, name);
4732 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4733 "\"%s\": %s\n", gecos_name, expand_string_message);
4735 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4736 "gecos field \"%s\"\n", gecos_pattern, name);
4737 store_free((void *)re);
4739 originator_name = string_copy(name);
4742 /* A trusted caller has used -f but not -F */
4744 else originator_name = US"";
4747 /* Break the retry loop */
4752 if (++i > finduser_retries) break;
4756 /* If we cannot get a user login, log the incident and give up, unless the
4757 configuration specifies something to use. When running in the test harness,
4758 any setting of unknown_login overrides the actual name. */
4760 if (originator_login == NULL || running_in_test_harness)
4762 if (unknown_login != NULL)
4764 originator_login = expand_string(unknown_login);
4765 if (originator_name == NULL && unknown_username != NULL)
4766 originator_name = expand_string(unknown_username);
4767 if (originator_name == NULL) originator_name = US"";
4769 if (originator_login == NULL)
4770 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4774 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4777 originator_name = string_copy(parse_fix_phrase(originator_name,
4778 Ustrlen(originator_name), big_buffer, big_buffer_size));
4780 /* If a message is created by this call of Exim, the uid/gid of its originator
4781 are those of the caller. These values are overridden if an existing message is
4782 read in from the spool. */
4784 originator_uid = real_uid;
4785 originator_gid = real_gid;
4787 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4788 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4790 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4791 returns. We leave this till here so that the originator_ fields are available
4792 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4795 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4799 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4800 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4801 "mua_wrapper is set");
4806 /* If the sender ident has not been set (by a trusted caller) set it to
4807 the caller. This will get overwritten below for an inetd call. If a trusted
4808 caller has set it empty, unset it. */
4810 if (sender_ident == NULL) sender_ident = originator_login;
4811 else if (sender_ident[0] == 0) sender_ident = NULL;
4813 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4814 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4815 originator_* variables set. */
4817 if (test_rewrite_arg >= 0)
4819 really_exim = FALSE;
4820 if (test_rewrite_arg >= argc)
4822 printf("-brw needs an address argument\n");
4823 exim_exit(EXIT_FAILURE);
4825 rewrite_test(argv[test_rewrite_arg]);
4826 exim_exit(EXIT_SUCCESS);
4829 /* A locally-supplied message is considered to be coming from a local user
4830 unless a trusted caller supplies a sender address with -f, or is passing in the
4831 message via SMTP (inetd invocation or otherwise). */
4833 if ((sender_address == NULL && !smtp_input) ||
4834 (!trusted_caller && filter_test == FTEST_NONE))
4836 sender_local = TRUE;
4838 /* A trusted caller can supply authenticated_sender and authenticated_id
4839 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4840 defaults except when host checking. */
4842 if (authenticated_sender == NULL && !host_checking)
4843 authenticated_sender = string_sprintf("%s@%s", originator_login,
4844 qualify_domain_sender);
4845 if (authenticated_id == NULL && !host_checking)
4846 authenticated_id = originator_login;
4849 /* Trusted callers are always permitted to specify the sender address.
4850 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4851 is specified is the empty address. However, if a trusted caller does not
4852 specify a sender address for SMTP input, we leave sender_address unset. This
4853 causes the MAIL commands to be honoured. */
4855 if ((!smtp_input && sender_address == NULL) ||
4856 !receive_check_set_sender(sender_address))
4858 /* Either the caller is not permitted to set a general sender, or this is
4859 non-SMTP input and the trusted caller has not set a sender. If there is no
4860 sender, or if a sender other than <> is set, override with the originator's
4861 login (which will get qualified below), except when checking things. */
4863 if (sender_address == NULL /* No sender_address set */
4865 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4866 !checking)) /* Not running tests, including filter tests */
4868 sender_address = originator_login;
4869 sender_address_forced = FALSE;
4870 sender_address_domain = 0;
4874 /* Remember whether an untrusted caller set the sender address */
4876 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4878 /* Ensure that the sender address is fully qualified unless it is the empty
4879 address, which indicates an error message, or doesn't exist (root caller, smtp
4880 interface, no -f argument). */
4882 if (sender_address != NULL && sender_address[0] != 0 &&
4883 sender_address_domain == 0)
4884 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4885 qualify_domain_sender);
4887 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4889 /* Handle a request to verify a list of addresses, or test them for delivery.
4890 This must follow the setting of the sender address, since routers can be
4891 predicated upon the sender. If no arguments are given, read addresses from
4892 stdin. Set debug_level to at least D_v to get full output for address testing.
4895 if (verify_address_mode || address_test_mode)
4898 int flags = vopt_qualify;
4900 if (verify_address_mode)
4902 if (!verify_as_sender) flags |= vopt_is_recipient;
4903 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4908 flags |= vopt_is_recipient;
4909 debug_selector |= D_v;
4910 debug_file = stderr;
4911 debug_fd = fileno(debug_file);
4912 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4915 if (recipients_arg < argc)
4917 while (recipients_arg < argc)
4919 uschar *s = argv[recipients_arg++];
4922 BOOL finished = FALSE;
4923 uschar *ss = parse_find_address_end(s, FALSE);
4924 if (*ss == ',') *ss = 0; else finished = TRUE;
4925 test_address(s, flags, &exit_value);
4928 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4935 uschar *s = get_stdinput(NULL, NULL);
4936 if (s == NULL) break;
4937 test_address(s, flags, &exit_value);
4941 exim_exit(exit_value);
4944 /* Handle expansion checking. Either expand items on the command line, or read
4945 from stdin if there aren't any. If -Mset was specified, load the message so
4946 that its variables can be used, but restrict this facility to admin users.
4947 Otherwise, if -bem was used, read a message from stdin. */
4951 dns_init(FALSE, FALSE, FALSE);
4952 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4954 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4957 fprintf(stderr, "exim: permission denied\n");
4960 message_id = argv[msg_action_arg];
4961 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4962 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4963 printf ("Failed to load message datafile %s\n", message_id);
4964 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4965 printf ("Failed to load message %s\n", message_id);
4968 /* Read a test message from a file. We fudge it up to be on stdin, saving
4969 stdin itself for later reading of expansion strings. */
4971 else if (expansion_test_message != NULL)
4973 int save_stdin = dup(0);
4974 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4977 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4979 return EXIT_FAILURE;
4982 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4983 message_ended = END_NOTENDED;
4984 read_message_body(receive_msg(extract_recipients));
4985 message_linecount += body_linecount;
4986 (void)dup2(save_stdin, 0);
4987 (void)close(save_stdin);
4988 clearerr(stdin); /* Required by Darwin */
4991 /* Allow $recipients for this testing */
4993 enable_dollar_recipients = TRUE;
4995 /* Expand command line items */
4997 if (recipients_arg < argc)
4999 while (recipients_arg < argc)
5001 uschar *s = argv[recipients_arg++];
5002 uschar *ss = expand_string(s);
5003 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5004 else printf("%s\n", CS ss);
5012 char *(*fn_readline)(const char *) = NULL;
5013 void (*fn_addhist)(const char *) = NULL;
5016 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5022 uschar *source = get_stdinput(fn_readline, fn_addhist);
5023 if (source == NULL) break;
5024 ss = expand_string(source);
5026 printf ("Failed: %s\n", expand_string_message);
5027 else printf("%s\n", CS ss);
5031 if (dlhandle != NULL) dlclose(dlhandle);
5035 /* The data file will be open after -Mset */
5037 if (deliver_datafile >= 0)
5039 (void)close(deliver_datafile);
5040 deliver_datafile = -1;
5043 exim_exit(EXIT_SUCCESS);
5047 /* The active host name is normally the primary host name, but it can be varied
5048 for hosts that want to play several parts at once. We need to ensure that it is
5049 set for host checking, and for receiving messages. */
5051 smtp_active_hostname = primary_hostname;
5052 if (raw_active_hostname != NULL)
5054 uschar *nah = expand_string(raw_active_hostname);
5057 if (!expand_string_forcedfail)
5058 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5059 "(smtp_active_hostname): %s", raw_active_hostname,
5060 expand_string_message);
5062 else if (nah[0] != 0) smtp_active_hostname = nah;
5065 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5066 given IP address so that the blocking and relay configuration can be tested.
5067 Unless a sender_ident was set by -oMt, we discard it (the default is the
5068 caller's login name). An RFC 1413 call is made only if we are running in the
5069 test harness and an incoming interface and both ports are specified, because
5070 there is no TCP/IP call to find the ident for. */
5077 if (!sender_ident_set)
5079 sender_ident = NULL;
5080 if (running_in_test_harness && sender_host_port != 0 &&
5081 interface_address != NULL && interface_port != 0)
5082 verify_get_ident(1413);
5085 /* In case the given address is a non-canonical IPv6 address, canonicize
5086 it. The code works for both IPv4 and IPv6, as it happens. */
5088 size = host_aton(sender_host_address, x);
5089 sender_host_address = store_get(48); /* large enough for full IPv6 */
5090 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5092 /* Now set up for testing */
5094 host_build_sender_fullhost();
5098 sender_local = FALSE;
5099 sender_host_notsocket = TRUE;
5100 debug_file = stderr;
5101 debug_fd = fileno(debug_file);
5102 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5103 "**** but without any ident (RFC 1413) callback.\n"
5104 "**** This is not for real!\n\n",
5105 sender_host_address);
5107 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5108 if (verify_check_host(&hosts_connection_nolog) == OK)
5109 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5110 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5112 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5113 because a log line has already been written for all its failure exists
5114 (usually "connection refused: <reason>") and writing another one is
5115 unnecessary clutter. */
5117 if (smtp_start_session())
5119 reset_point = store_get(0);
5122 store_reset(reset_point);
5123 if (smtp_setup_msg() <= 0) break;
5124 if (!receive_msg(FALSE)) break;
5128 exim_exit(EXIT_SUCCESS);
5132 /* Arrange for message reception if recipients or SMTP were specified;
5133 otherwise complain unless a version print (-bV) happened or this is a filter
5134 verification test or info dump.
5135 In the former case, show the configuration file name. */
5137 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5139 if (version_printed)
5141 printf("Configuration file is %s\n", config_main_filename);
5142 return EXIT_SUCCESS;
5145 if (info_flag != CMDINFO_NONE)
5147 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5148 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5151 if (filter_test == FTEST_NONE)
5152 exim_usage(called_as);
5156 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5157 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5158 that we are not called from inetd, because that is rejected above. The
5159 following configuration settings are forced here:
5161 (1) Synchronous delivery (-odi)
5162 (2) Errors to stderr (-oep == -oeq)
5163 (3) No parallel remote delivery
5164 (4) Unprivileged delivery
5166 We don't force overall queueing options because there are several of them;
5167 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5168 to override any SMTP queueing. */
5172 synchronous_delivery = TRUE;
5173 arg_error_handling = ERRORS_STDERR;
5174 remote_max_parallel = 1;
5175 deliver_drop_privilege = TRUE;
5177 queue_smtp_domains = NULL;
5179 message_utf8_downconvert = -1; /* convert-if-needed */
5184 /* Prepare to accept one or more new messages on the standard input. When a
5185 message has been read, its id is returned in message_id[]. If doing immediate
5186 delivery, we fork a delivery process for each received message, except for the
5187 last one, where we can save a process switch.
5189 It is only in non-smtp mode that error_handling is allowed to be changed from
5190 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5191 sendmail error modes other than -oem ever actually used? Later: yes.) */
5193 if (!smtp_input) error_handling = arg_error_handling;
5195 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5196 logging being sent down the socket and make an identd call to get the
5201 (void)fclose(stderr);
5202 exim_nullstd(); /* Re-open to /dev/null */
5203 verify_get_ident(IDENT_PORT);
5204 host_build_sender_fullhost();
5205 set_process_info("handling incoming connection from %s via inetd",
5209 /* If the sender host address has been set, build sender_fullhost if it hasn't
5210 already been done (which it will have been for inetd). This caters for the
5211 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5212 so that the test for IP options is skipped for -bs input. */
5214 if (sender_host_address != NULL && sender_fullhost == NULL)
5216 host_build_sender_fullhost();
5217 set_process_info("handling incoming connection from %s via -oMa",
5219 sender_host_notsocket = TRUE;
5222 /* Otherwise, set the sender host as unknown except for inetd calls. This
5223 prevents host checking in the case of -bs not from inetd and also for -bS. */
5225 else if (!is_inetd) sender_host_unknown = TRUE;
5227 /* If stdout does not exist, then dup stdin to stdout. This can happen
5228 if exim is started from inetd. In this case fd 0 will be set to the socket,
5229 but fd 1 will not be set. This also happens for passed SMTP channels. */
5231 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5233 /* Set up the incoming protocol name and the state of the program. Root is
5234 allowed to force received protocol via the -oMr option above. If we have come
5235 via inetd, the process info has already been set up. We don't set
5236 received_protocol here for smtp input, as it varies according to
5237 batch/HELO/EHLO/AUTH/TLS. */
5241 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5242 smtp_batched_input? "batched " : "",
5243 (sender_address!= NULL)? sender_address : originator_login);
5247 if (received_protocol == NULL)
5248 received_protocol = string_sprintf("local%s", called_as);
5249 set_process_info("accepting a local non-SMTP message from <%s>",
5253 /* Initialize the session_local_queue-only flag (this will be ignored if
5254 mua_wrapper is set) */
5257 session_local_queue_only = queue_only;
5259 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5260 the spool if so configured. On failure, we must not attempt to send an error
5261 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5262 error code is given.) */
5264 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5266 fprintf(stderr, "exim: insufficient disk space\n");
5267 return EXIT_FAILURE;
5270 /* If this is smtp input of any kind, real or batched, handle the start of the
5273 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5274 because a log line has already been written for all its failure exists
5275 (usually "connection refused: <reason>") and writing another one is
5276 unnecessary clutter. */
5282 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5283 if (verify_check_host(&hosts_connection_nolog) == OK)
5284 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5285 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5286 if (!smtp_start_session())
5289 exim_exit(EXIT_SUCCESS);
5293 /* Otherwise, set up the input size limit here. */
5297 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5298 if (expand_string_message != NULL)
5300 if (thismessage_size_limit == -1)
5301 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5302 "message_size_limit: %s", expand_string_message);
5304 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5305 "message_size_limit: %s", expand_string_message);
5309 /* Loop for several messages when reading SMTP input. If we fork any child
5310 processes, we don't want to wait for them unless synchronous delivery is
5311 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5312 same as SIG_DFL, despite the fact that documentation often lists the default as
5313 "ignore". This is a confusing area. This is what I know:
5315 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5316 processes that complete simply to go away without ever becoming defunct. You
5317 can't then wait for them - but we don't want to wait for them in the
5318 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5319 happen for all OS (e.g. *BSD is different).
5321 But that's not the end of the story. Some (many? all?) systems have the
5322 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5323 has by default, so it seems that the difference is merely one of default
5324 (compare restarting vs non-restarting signals).
5326 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5327 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5328 of the loop below. Paranoia rules.
5330 February 2003: That's *still* not the end of the story. There are now versions
5331 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5332 process then calls waitpid(), a grumble is written to the system log, because
5333 this is logically inconsistent. In other words, it doesn't like the paranoia.
5334 As a consequenc of this, the waitpid() below is now excluded if we are sure
5335 that SIG_IGN works. */
5337 if (!synchronous_delivery)
5340 struct sigaction act;
5341 act.sa_handler = SIG_IGN;
5342 sigemptyset(&(act.sa_mask));
5343 act.sa_flags = SA_NOCLDWAIT;
5344 sigaction(SIGCHLD, &act, NULL);
5346 signal(SIGCHLD, SIG_IGN);
5350 /* Save the current store pool point, for resetting at the start of
5351 each message, and save the real sender address, if any. */
5353 reset_point = store_get(0);
5354 real_sender_address = sender_address;
5356 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5357 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5362 store_reset(reset_point);
5365 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5366 input and build the recipients list, before calling receive_msg() to read the
5367 message proper. Whatever sender address is given in the SMTP transaction is
5368 often ignored for local senders - we use the actual sender, which is normally
5369 either the underlying user running this process or a -f argument provided by
5370 a trusted caller. It is saved in real_sender_address. The test for whether to
5371 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5376 if ((rc = smtp_setup_msg()) > 0)
5378 if (real_sender_address != NULL &&
5379 !receive_check_set_sender(sender_address))
5381 sender_address = raw_sender = real_sender_address;
5382 sender_address_unrewritten = NULL;
5385 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5386 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5387 the very end. The result of the ACL is ignored (as for other non-SMTP
5388 messages). It is run for its potential side effects. */
5390 if (smtp_batched_input && acl_not_smtp_start != NULL)
5392 uschar *user_msg, *log_msg;
5393 enable_dollar_recipients = TRUE;
5394 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5395 &user_msg, &log_msg);
5396 enable_dollar_recipients = FALSE;
5399 /* Now get the data for the message */
5401 more = receive_msg(extract_recipients);
5402 if (message_id[0] == 0)
5405 smtp_log_no_mail(); /* Log no mail if configured */
5406 exim_exit(EXIT_FAILURE);
5411 smtp_log_no_mail(); /* Log no mail if configured */
5412 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5416 /* In the non-SMTP case, we have all the information from the command
5417 line, but must process it in case it is in the more general RFC822
5418 format, and in any case, to detect syntax errors. Also, it appears that
5419 the use of comma-separated lists as single arguments is common, so we
5420 had better support them. */
5426 int count = argc - recipients_arg;
5427 uschar **list = argv + recipients_arg;
5429 /* These options cannot be changed dynamically for non-SMTP messages */
5431 active_local_sender_retain = local_sender_retain;
5432 active_local_from_check = local_from_check;
5434 /* Save before any rewriting */
5436 raw_sender = string_copy(sender_address);
5438 /* Loop for each argument */
5440 for (i = 0; i < count; i++)
5442 int start, end, domain;
5444 uschar *s = list[i];
5446 /* Loop for each comma-separated address */
5450 BOOL finished = FALSE;
5452 uschar *ss = parse_find_address_end(s, FALSE);
5454 if (*ss == ',') *ss = 0; else finished = TRUE;
5456 /* Check max recipients - if -t was used, these aren't recipients */
5458 if (recipients_max > 0 && ++rcount > recipients_max &&
5459 !extract_recipients)
5460 if (error_handling == ERRORS_STDERR)
5462 fprintf(stderr, "exim: too many recipients\n");
5463 exim_exit(EXIT_FAILURE);
5468 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5469 errors_sender_rc : EXIT_FAILURE;
5474 BOOL b = allow_utf8_domains;
5475 allow_utf8_domains = TRUE;
5478 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5481 if (string_is_utf8(recipient))
5482 message_smtputf8 = TRUE;
5484 allow_utf8_domains = b;
5487 if (domain == 0 && !allow_unqualified_recipient)
5490 errmess = US"unqualified recipient address not allowed";
5493 if (recipient == NULL)
5495 if (error_handling == ERRORS_STDERR)
5497 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5498 string_printing(list[i]), errmess);
5499 exim_exit(EXIT_FAILURE);
5505 eblock.text1 = string_printing(list[i]);
5506 eblock.text2 = errmess;
5508 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5509 errors_sender_rc : EXIT_FAILURE;
5513 receive_add_recipient(recipient, -1);
5516 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5520 /* Show the recipients when debugging */
5525 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5526 if (recipients_list != NULL)
5528 debug_printf("Recipients:\n");
5529 for (i = 0; i < recipients_count; i++)
5530 debug_printf(" %s\n", recipients_list[i].address);
5534 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5535 ignored; rejecting here would just add complication, and it can just as
5536 well be done later. Allow $recipients to be visible in the ACL. */
5538 if (acl_not_smtp_start)
5540 uschar *user_msg, *log_msg;
5541 enable_dollar_recipients = TRUE;
5542 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5543 &user_msg, &log_msg);
5544 enable_dollar_recipients = FALSE;
5547 /* Pause for a while waiting for input. If none received in that time,
5548 close the logfile, if we had one open; then if we wait for a long-running
5549 datasource (months, in one use-case) log rotation will not leave us holding
5552 if (!receive_timeout)
5554 struct timeval t = { 30*60, 0 }; /* 30 minutess */
5557 FD_ZERO(&r); FD_SET(0, &r);
5558 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5561 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5562 will just read the headers for the message, and not write anything onto the
5565 message_ended = END_NOTENDED;
5566 more = receive_msg(extract_recipients);
5568 /* more is always FALSE here (not SMTP message) when reading a message
5569 for real; when reading the headers of a message for filter testing,
5570 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5572 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5573 } /* Non-SMTP message reception */
5575 /* If this is a filter testing run, there are headers in store, but
5576 no message on the spool. Run the filtering code in testing mode, setting
5577 the domain to the qualify domain and the local part to the current user,
5578 unless they have been set by options. The prefix and suffix are left unset
5579 unless specified. The the return path is set to to the sender unless it has
5580 already been set from a return-path header in the message. */
5582 if (filter_test != FTEST_NONE)
5584 deliver_domain = (ftest_domain != NULL)?
5585 ftest_domain : qualify_domain_recipient;
5586 deliver_domain_orig = deliver_domain;
5587 deliver_localpart = (ftest_localpart != NULL)?
5588 ftest_localpart : originator_login;
5589 deliver_localpart_orig = deliver_localpart;
5590 deliver_localpart_prefix = ftest_prefix;
5591 deliver_localpart_suffix = ftest_suffix;
5592 deliver_home = originator_home;
5594 if (return_path == NULL)
5596 printf("Return-path copied from sender\n");
5597 return_path = string_copy(sender_address);
5600 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5601 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5603 receive_add_recipient(
5604 string_sprintf("%s%s%s@%s",
5605 (ftest_prefix == NULL)? US"" : ftest_prefix,
5607 (ftest_suffix == NULL)? US"" : ftest_suffix,
5608 deliver_domain), -1);
5610 printf("Recipient = %s\n", recipients_list[0].address);
5611 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5612 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5614 if (chdir("/")) /* Get away from wherever the user is running this from */
5616 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5617 exim_exit(EXIT_FAILURE);
5620 /* Now we run either a system filter test, or a user filter test, or both.
5621 In the latter case, headers added by the system filter will persist and be
5622 available to the user filter. We need to copy the filter variables
5625 if ((filter_test & FTEST_SYSTEM) != 0)
5627 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5628 exim_exit(EXIT_FAILURE);
5631 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5633 if ((filter_test & FTEST_USER) != 0)
5635 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5636 exim_exit(EXIT_FAILURE);
5639 exim_exit(EXIT_SUCCESS);
5642 /* Else act on the result of message reception. We should not get here unless
5643 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5644 will be TRUE. If it is not, check on the number of messages received in this
5647 if (!session_local_queue_only &&
5648 smtp_accept_queue_per_connection > 0 &&
5649 receive_messagecount > smtp_accept_queue_per_connection)
5651 session_local_queue_only = TRUE;
5652 queue_only_reason = 2;
5655 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5656 and queue_only_load is set, check that the load average is below it. If it is
5657 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5658 default), we put the whole session into queue_only mode. It then remains this
5659 way for any subsequent messages on the same SMTP connection. This is a
5660 deliberate choice; even though the load average may fall, it doesn't seem
5661 right to deliver later messages on the same call when not delivering earlier
5662 ones. However, there are odd cases where this is not wanted, so this can be
5663 changed by setting queue_only_load_latch false. */
5665 local_queue_only = session_local_queue_only;
5666 if (!local_queue_only && queue_only_load >= 0)
5668 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5669 if (local_queue_only)
5671 queue_only_reason = 3;
5672 if (queue_only_load_latch) session_local_queue_only = TRUE;
5676 /* If running as an MUA wrapper, all queueing options and freezing options
5680 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5682 /* Log the queueing here, when it will get a message id attached, but
5683 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5686 if (local_queue_only) switch(queue_only_reason)
5689 log_write(L_delay_delivery,
5690 LOG_MAIN, "no immediate delivery: more than %d messages "
5691 "received in one connection", smtp_accept_queue_per_connection);
5695 log_write(L_delay_delivery,
5696 LOG_MAIN, "no immediate delivery: load average %.2f",
5697 (double)load_average/1000.0);
5701 /* Else do the delivery unless the ACL or local_scan() called for queue only
5702 or froze the message. Always deliver in a separate process. A fork failure is
5703 not a disaster, as the delivery will eventually happen on a subsequent queue
5704 run. The search cache must be tidied before the fork, as the parent will
5705 do it before exiting. The child will trigger a lookup failure and
5706 thereby defer the delivery if it tries to use (for example) a cached ldap
5707 connection that the parent has called unbind on. */
5709 else if (!queue_only_policy && !deliver_freeze)
5714 if ((pid = fork()) == 0)
5717 close_unwanted(); /* Close unwanted file descriptors and TLS */
5718 exim_nullstd(); /* Ensure std{in,out,err} exist */
5720 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5721 mode, deliver_drop_privilege is forced TRUE). */
5723 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5725 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5726 2, US"-Mc", message_id);
5727 /* Control does not return here. */
5730 /* No need to re-exec */
5732 rc = deliver_message(message_id, FALSE, FALSE);
5734 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5735 EXIT_SUCCESS : EXIT_FAILURE);
5740 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5741 "process: %s", strerror(errno));
5744 /* In the parent, wait if synchronous delivery is required. This will
5745 always be the case in MUA wrapper mode. */
5747 else if (synchronous_delivery)
5750 while (wait(&status) != pid);
5751 if ((status & 0x00ff) != 0)
5752 log_write(0, LOG_MAIN|LOG_PANIC,
5753 "process %d crashed with signal %d while delivering %s",
5754 (int)pid, status & 0x00ff, message_id);
5755 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5759 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5760 automatically reaps children (see comments above the loop), clear away any
5761 finished subprocesses here, in case there are lots of messages coming in
5762 from the same source. */
5764 #ifndef SIG_IGN_WORKS
5765 while (waitpid(-1, NULL, WNOHANG) > 0);
5769 exim_exit(EXIT_SUCCESS); /* Never returns */
5770 return 0; /* To stop compiler warning */