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_SPF
847 fprintf(f, " Experimental_SPF");
849 #ifdef EXPERIMENTAL_SRS
850 fprintf(f, " Experimental_SRS");
852 #ifdef EXPERIMENTAL_BRIGHTMAIL
853 fprintf(f, " Experimental_Brightmail");
855 #ifdef EXPERIMENTAL_DANE
856 fprintf(f, " Experimental_DANE");
858 #ifdef EXPERIMENTAL_DCC
859 fprintf(f, " Experimental_DCC");
861 #ifdef EXPERIMENTAL_DMARC
862 fprintf(f, " Experimental_DMARC");
864 #ifdef EXPERIMENTAL_DSN_INFO
865 fprintf(f, " Experimental_DSN_info");
869 fprintf(f, "Lookups (built-in):");
870 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
871 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
873 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
876 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
877 fprintf(f, " dbm dbmjz dbmnz");
879 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
880 fprintf(f, " dnsdb");
882 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
883 fprintf(f, " dsearch");
885 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
886 fprintf(f, " ibase");
888 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
889 fprintf(f, " ldap ldapdn ldapm");
891 #ifdef EXPERIMENTAL_LMDB
894 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
895 fprintf(f, " mysql");
897 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
898 fprintf(f, " nis nis0");
900 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
901 fprintf(f, " nisplus");
903 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
904 fprintf(f, " oracle");
906 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
907 fprintf(f, " passwd");
909 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
910 fprintf(f, " pgsql");
912 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
913 fprintf(f, " redis");
915 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
916 fprintf(f, " sqlite");
918 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
919 fprintf(f, " testdb");
921 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
922 fprintf(f, " whoson");
926 fprintf(f, "Authenticators:");
928 fprintf(f, " cram_md5");
930 #ifdef AUTH_CYRUS_SASL
931 fprintf(f, " cyrus_sasl");
934 fprintf(f, " dovecot");
937 fprintf(f, " gsasl");
939 #ifdef AUTH_HEIMDAL_GSSAPI
940 fprintf(f, " heimdal_gssapi");
942 #ifdef AUTH_PLAINTEXT
943 fprintf(f, " plaintext");
953 fprintf(f, "Routers:");
955 fprintf(f, " accept");
957 #ifdef ROUTER_DNSLOOKUP
958 fprintf(f, " dnslookup");
960 #ifdef ROUTER_IPLITERAL
961 fprintf(f, " ipliteral");
963 #ifdef ROUTER_IPLOOKUP
964 fprintf(f, " iplookup");
966 #ifdef ROUTER_MANUALROUTE
967 fprintf(f, " manualroute");
969 #ifdef ROUTER_QUERYPROGRAM
970 fprintf(f, " queryprogram");
972 #ifdef ROUTER_REDIRECT
973 fprintf(f, " redirect");
977 fprintf(f, "Transports:");
978 #ifdef TRANSPORT_APPENDFILE
979 fprintf(f, " appendfile");
980 #ifdef SUPPORT_MAILDIR
981 fprintf(f, "/maildir");
983 #ifdef SUPPORT_MAILSTORE
984 fprintf(f, "/mailstore");
990 #ifdef TRANSPORT_AUTOREPLY
991 fprintf(f, " autoreply");
993 #ifdef TRANSPORT_LMTP
996 #ifdef TRANSPORT_PIPE
999 #ifdef TRANSPORT_SMTP
1000 fprintf(f, " smtp");
1004 if (fixed_never_users[0] > 0)
1007 fprintf(f, "Fixed never_users: ");
1008 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1009 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1010 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1013 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1015 /* Everything else is details which are only worth reporting when debugging.
1016 Perhaps the tls_version_report should move into this too. */
1021 /* clang defines __GNUC__ (at least, for me) so test for it first */
1022 #if defined(__clang__)
1023 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
1024 #elif defined(__GNUC__)
1025 fprintf(f, "Compiler: GCC [%s]\n",
1029 "? unknown version ?"
1033 fprintf(f, "Compiler: <unknown>\n");
1037 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
1038 __GLIBC__, __GLIBC_MINOR__);
1039 if (__GLIBC_PREREQ(2, 1))
1040 fprintf(f, " Runtime: %s\n",
1041 gnu_get_libc_version());
1045 tls_version_report(f);
1048 utf8_version_report(f);
1051 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1052 if (authi->version_report)
1053 (*authi->version_report)(f);
1055 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1056 characters; unless it's an ancient version of PCRE in which case it
1058 #ifndef PCRE_PRERELEASE
1059 # define PCRE_PRERELEASE
1062 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1063 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1065 PCRE_MAJOR, PCRE_MINOR,
1066 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1069 #undef EXPAND_AND_QUOTE
1072 for (i = 0; i < lookup_list_count; i++)
1073 if (lookup_list[i]->version_report)
1074 lookup_list[i]->version_report(f);
1076 #ifdef WHITELIST_D_MACROS
1077 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1079 fprintf(f, "WHITELIST_D_MACROS unset\n");
1081 #ifdef TRUSTED_CONFIG_LIST
1082 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1084 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1091 /*************************************************
1092 * Show auxiliary information about Exim *
1093 *************************************************/
1096 show_exim_information(enum commandline_info request, FILE *stream)
1103 fprintf(stream, "Oops, something went wrong.\n");
1107 "The -bI: flag takes a string indicating which information to provide.\n"
1108 "If the string is not recognised, you'll get this help (on stderr).\n"
1110 " exim -bI:help this information\n"
1111 " exim -bI:dscp dscp value keywords known\n"
1112 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1116 for (pp = exim_sieve_extension_list; *pp; ++pp)
1117 fprintf(stream, "%s\n", *pp);
1120 dscp_list_to_stream(stream);
1126 /*************************************************
1127 * Quote a local part *
1128 *************************************************/
1130 /* This function is used when a sender address or a From: or Sender: header
1131 line is being created from the caller's login, or from an authenticated_id. It
1132 applies appropriate quoting rules for a local part.
1134 Argument: the local part
1135 Returns: the local part, quoted if necessary
1139 local_part_quote(uschar *lpart)
1141 BOOL needs_quote = FALSE;
1146 for (t = lpart; !needs_quote && *t != 0; t++)
1148 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1149 (*t != '.' || t == lpart || t[1] == 0);
1152 if (!needs_quote) return lpart;
1155 yield = string_catn(NULL, &size, &ptr, US"\"", 1);
1159 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1162 yield = string_cat(yield, &size, &ptr, lpart);
1165 yield = string_catn(yield, &size, &ptr, lpart, nq - lpart);
1166 yield = string_catn(yield, &size, &ptr, US"\\", 1);
1167 yield = string_catn(yield, &size, &ptr, nq, 1);
1171 yield = string_catn(yield, &size, &ptr, US"\"", 1);
1179 /*************************************************
1180 * Load readline() functions *
1181 *************************************************/
1183 /* This function is called from testing executions that read data from stdin,
1184 but only when running as the calling user. Currently, only -be does this. The
1185 function loads the readline() function library and passes back the functions.
1186 On some systems, it needs the curses library, so load that too, but try without
1187 it if loading fails. All this functionality has to be requested at build time.
1190 fn_readline_ptr pointer to where to put the readline pointer
1191 fn_addhist_ptr pointer to where to put the addhistory function
1193 Returns: the dlopen handle or NULL on failure
1197 set_readline(char * (**fn_readline_ptr)(const char *),
1198 void (**fn_addhist_ptr)(const char *))
1201 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1203 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1204 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1206 if (dlhandle != NULL)
1208 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1209 * char * readline (const char *prompt);
1210 * void add_history (const char *string);
1212 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1213 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1217 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1226 /*************************************************
1227 * Get a line from stdin for testing things *
1228 *************************************************/
1230 /* This function is called when running tests that can take a number of lines
1231 of input (for example, -be and -bt). It handles continuations and trailing
1232 spaces. And prompting and a blank line output on eof. If readline() is in use,
1233 the arguments are non-NULL and provide the relevant functions.
1236 fn_readline readline function or NULL
1237 fn_addhist addhist function or NULL
1239 Returns: pointer to dynamic memory, or NULL at end of file
1243 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1248 uschar *yield = NULL;
1250 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1254 uschar buffer[1024];
1258 char *readline_line = NULL;
1259 if (fn_readline != NULL)
1261 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1262 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1263 p = US readline_line;
1268 /* readline() not in use */
1271 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1275 /* Handle the line */
1277 ss = p + (int)Ustrlen(p);
1278 while (ss > p && isspace(ss[-1])) ss--;
1282 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1285 yield = string_catn(yield, &size, &ptr, p, ss - p);
1288 if (fn_readline != NULL) free(readline_line);
1291 /* yield can only be NULL if ss==p */
1292 if (ss == p || yield[ptr-1] != '\\')
1294 if (yield) yield[ptr] = 0;
1300 if (yield == NULL) printf("\n");
1306 /*************************************************
1307 * Output usage information for the program *
1308 *************************************************/
1310 /* This function is called when there are no recipients
1311 or a specific --help argument was added.
1314 progname information on what name we were called by
1316 Returns: DOES NOT RETURN
1320 exim_usage(uschar *progname)
1323 /* Handle specific program invocation varients */
1324 if (Ustrcmp(progname, US"-mailq") == 0)
1327 "mailq - list the contents of the mail queue\n\n"
1328 "For a list of options, see the Exim documentation.\n");
1332 /* Generic usage - we output this whatever happens */
1334 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1335 "not directly from a shell command line. Options and/or arguments control\n"
1336 "what it does when called. For a list of options, see the Exim documentation.\n");
1343 /*************************************************
1344 * Validate that the macros given are okay *
1345 *************************************************/
1347 /* Typically, Exim will drop privileges if macros are supplied. In some
1348 cases, we want to not do so.
1350 Arguments: none (macros is a global)
1351 Returns: true if trusted, false otherwise
1355 macros_trusted(void)
1357 #ifdef WHITELIST_D_MACROS
1359 uschar *whitelisted, *end, *p, **whites, **w;
1360 int white_count, i, n;
1362 BOOL prev_char_item, found;
1367 #ifndef WHITELIST_D_MACROS
1371 /* We only trust -D overrides for some invoking users:
1372 root, the exim run-time user, the optional config owner user.
1373 I don't know why config-owner would be needed, but since they can own the
1374 config files anyway, there's no security risk to letting them override -D. */
1375 if ( ! ((real_uid == root_uid)
1376 || (real_uid == exim_uid)
1377 #ifdef CONFIGURE_OWNER
1378 || (real_uid == config_uid)
1382 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1386 /* Get a list of macros which are whitelisted */
1387 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1388 prev_char_item = FALSE;
1390 for (p = whitelisted; *p != '\0'; ++p)
1392 if (*p == ':' || isspace(*p))
1397 prev_char_item = FALSE;
1400 if (!prev_char_item)
1401 prev_char_item = TRUE;
1408 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1409 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1414 if (i == white_count)
1416 while (*p != '\0' && p < end)
1422 /* The list of macros should be very short. Accept the N*M complexity. */
1423 for (m = macros; m != NULL; m = m->next)
1426 for (w = whites; *w; ++w)
1427 if (Ustrcmp(*w, m->name) == 0)
1434 if (m->replacement == NULL)
1436 len = Ustrlen(m->replacement);
1439 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1440 0, PCRE_EOPT, NULL, 0);
1443 if (n != PCRE_ERROR_NOMATCH)
1444 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1448 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1454 /*************************************************
1455 * Entry point and high-level code *
1456 *************************************************/
1458 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1459 the appropriate action. All the necessary functions are present in the one
1460 binary. I originally thought one should split it up, but it turns out that so
1461 much of the apparatus is needed in each chunk that one might as well just have
1462 it all available all the time, which then makes the coding easier as well.
1465 argc count of entries in argv
1466 argv argument strings, with argv[0] being the program name
1468 Returns: EXIT_SUCCESS if terminated successfully
1469 EXIT_FAILURE otherwise, except when a message has been sent
1470 to the sender, and -oee was given
1474 main(int argc, char **cargv)
1476 uschar **argv = USS cargv;
1477 int arg_receive_timeout = -1;
1478 int arg_smtp_receive_timeout = -1;
1479 int arg_error_handling = error_handling;
1480 int filter_sfd = -1;
1481 int filter_ufd = -1;
1484 int list_queue_option = 0;
1486 int msg_action_arg = -1;
1487 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1488 int queue_only_reason = 0;
1490 int perl_start_option = 0;
1492 int recipients_arg = argc;
1493 int sender_address_domain = 0;
1494 int test_retry_arg = -1;
1495 int test_rewrite_arg = -1;
1496 BOOL arg_queue_only = FALSE;
1497 BOOL bi_option = FALSE;
1498 BOOL checking = FALSE;
1499 BOOL count_queue = FALSE;
1500 BOOL expansion_test = FALSE;
1501 BOOL extract_recipients = FALSE;
1502 BOOL flag_G = FALSE;
1503 BOOL flag_n = FALSE;
1504 BOOL forced_delivery = FALSE;
1505 BOOL f_end_dot = FALSE;
1506 BOOL deliver_give_up = FALSE;
1507 BOOL list_queue = FALSE;
1508 BOOL list_options = FALSE;
1509 BOOL list_config = FALSE;
1510 BOOL local_queue_only;
1512 BOOL one_msg_action = FALSE;
1513 BOOL queue_only_set = FALSE;
1514 BOOL receiving_message = TRUE;
1515 BOOL sender_ident_set = FALSE;
1516 BOOL session_local_queue_only;
1518 BOOL removed_privilege = FALSE;
1519 BOOL usage_wanted = FALSE;
1520 BOOL verify_address_mode = FALSE;
1521 BOOL verify_as_sender = FALSE;
1522 BOOL version_printed = FALSE;
1523 uschar *alias_arg = NULL;
1524 uschar *called_as = US"";
1525 uschar *cmdline_syslog_name = NULL;
1526 uschar *start_queue_run_id = NULL;
1527 uschar *stop_queue_run_id = NULL;
1528 uschar *expansion_test_message = NULL;
1529 uschar *ftest_domain = NULL;
1530 uschar *ftest_localpart = NULL;
1531 uschar *ftest_prefix = NULL;
1532 uschar *ftest_suffix = NULL;
1533 uschar *log_oneline = NULL;
1534 uschar *malware_test_file = NULL;
1535 uschar *real_sender_address;
1536 uschar *originator_home = US"/";
1541 struct stat statbuf;
1542 pid_t passed_qr_pid = (pid_t)0;
1543 int passed_qr_pipe = -1;
1544 gid_t group_list[NGROUPS_MAX];
1546 /* For the -bI: flag */
1547 enum commandline_info info_flag = CMDINFO_NONE;
1548 BOOL info_stdout = FALSE;
1550 /* Possible options for -R and -S */
1552 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1554 /* Need to define this in case we need to change the environment in order
1555 to get rid of a bogus time zone. We have to make it char rather than uschar
1556 because some OS define it in /usr/include/unistd.h. */
1558 extern char **environ;
1560 /* If the Exim user and/or group and/or the configuration file owner/group were
1561 defined by ref:name at build time, we must now find the actual uid/gid values.
1562 This is a feature to make the lives of binary distributors easier. */
1564 #ifdef EXIM_USERNAME
1565 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1569 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1573 /* If ref:name uses a number as the name, route_finduser() returns
1574 TRUE with exim_uid set and pw coerced to NULL. */
1576 exim_gid = pw->pw_gid;
1577 #ifndef EXIM_GROUPNAME
1581 "exim: ref:name should specify a usercode, not a group.\n"
1582 "exim: can't let you get away with it unless you also specify a group.\n");
1589 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1595 #ifdef EXIM_GROUPNAME
1596 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1598 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1604 #ifdef CONFIGURE_OWNERNAME
1605 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1607 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1608 CONFIGURE_OWNERNAME);
1613 /* We default the system_filter_user to be the Exim run-time user, as a
1614 sane non-root value. */
1615 system_filter_uid = exim_uid;
1617 #ifdef CONFIGURE_GROUPNAME
1618 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1620 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1621 CONFIGURE_GROUPNAME);
1626 /* In the Cygwin environment, some initialization used to need doing.
1627 It was fudged in by means of this macro; now no longer but we'll leave
1628 it in case of others. */
1634 /* Check a field which is patched when we are running Exim within its
1635 testing harness; do a fast initial check, and then the whole thing. */
1637 running_in_test_harness =
1638 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1640 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1641 at the start of a program; however, it seems that some environments do not
1642 follow this. A "strange" locale can affect the formatting of timestamps, so we
1645 setlocale(LC_ALL, "C");
1647 /* Set up the default handler for timing using alarm(). */
1649 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1651 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1652 because store_malloc writes a log entry on failure. */
1654 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1656 fprintf(stderr, "exim: failed to get store for log buffer\n");
1660 /* Initialize the default log options. */
1662 bits_set(log_selector, log_selector_size, log_default);
1664 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1665 NULL when the daemon is run and the file is closed. We have to use this
1666 indirection, because some systems don't allow writing to the variable "stderr".
1669 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1671 /* Arrange for the PCRE regex library to use our store functions. Note that
1672 the normal calls are actually macros that add additional arguments for
1673 debugging purposes so we have to assign specially constructed functions here.
1674 The default is to use store in the stacking pool, but this is overridden in the
1675 regex_must_compile() function. */
1677 pcre_malloc = function_store_get;
1678 pcre_free = function_dummy_free;
1680 /* Ensure there is a big buffer for temporary use in several places. It is put
1681 in malloc store so that it can be freed for enlargement if necessary. */
1683 big_buffer = store_malloc(big_buffer_size);
1685 /* Set up the handler for the data request signal, and set the initial
1686 descriptive text. */
1688 set_process_info("initializing");
1689 os_restarting_signal(SIGUSR1, usr1_handler);
1691 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1692 in the daemon code. For the rest of Exim's uses, we ignore it. */
1694 signal(SIGHUP, SIG_IGN);
1696 /* We don't want to die on pipe errors as the code is written to handle
1697 the write error instead. */
1699 signal(SIGPIPE, SIG_IGN);
1701 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1702 set to SIG_IGN. This causes subprocesses that complete before the parent
1703 process waits for them not to hang around, so when Exim calls wait(), nothing
1704 is there. The wait() code has been made robust against this, but let's ensure
1705 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1706 ending status. We use sigaction rather than plain signal() on those OS where
1707 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1708 problem on AIX with this.) */
1712 struct sigaction act;
1713 act.sa_handler = SIG_DFL;
1714 sigemptyset(&(act.sa_mask));
1716 sigaction(SIGCHLD, &act, NULL);
1719 signal(SIGCHLD, SIG_DFL);
1722 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1727 /* Set up the version number. Set up the leading 'E' for the external form of
1728 message ids, set the pointer to the internal form, and initialize it to
1729 indicate no message being processed. */
1732 message_id_option[0] = '-';
1733 message_id_external = message_id_option + 1;
1734 message_id_external[0] = 'E';
1735 message_id = message_id_external + 1;
1738 /* Set the umask to zero so that any files Exim creates using open() are
1739 created with the modes that it specifies. NOTE: Files created with fopen() have
1740 a problem, which was not recognized till rather late (February 2006). With this
1741 umask, such files will be world writeable. (They are all content scanning files
1742 in the spool directory, which isn't world-accessible, so this is not a
1743 disaster, but it's untidy.) I don't want to change this overall setting,
1744 however, because it will interact badly with the open() calls. Instead, there's
1745 now a function called modefopen() that fiddles with the umask while calling
1750 /* Precompile the regular expression for matching a message id. Keep this in
1751 step with the code that generates ids in the accept.c module. We need to do
1752 this here, because the -M options check their arguments for syntactic validity
1753 using mac_ismsgid, which uses this. */
1756 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1758 /* Precompile the regular expression that is used for matching an SMTP error
1759 code, possibly extended, at the start of an error message. Note that the
1760 terminating whitespace character is included. */
1763 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1766 #ifdef WHITELIST_D_MACROS
1767 /* Precompile the regular expression used to filter the content of macros
1768 given to -D for permissibility. */
1770 regex_whitelisted_macro =
1771 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1774 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1776 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1777 this seems to be a generally accepted convention, since one finds symbolic
1778 links called "mailq" in standard OS configurations. */
1780 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1781 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1784 receiving_message = FALSE;
1785 called_as = US"-mailq";
1788 /* If the program is called as "rmail" treat it as equivalent to
1789 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1790 i.e. preventing a single dot on a line from terminating the message, and
1791 returning with zero return code, even in cases of error (provided an error
1792 message has been sent). */
1794 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1795 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1798 called_as = US"-rmail";
1799 errors_sender_rc = EXIT_SUCCESS;
1802 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1803 this is a smail convention. */
1805 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1806 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1808 smtp_input = smtp_batched_input = TRUE;
1809 called_as = US"-rsmtp";
1812 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1813 this is a smail convention. */
1815 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1816 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1819 receiving_message = FALSE;
1820 called_as = US"-runq";
1823 /* If the program is called as "newaliases" treat it as equivalent to
1824 "exim -bi"; this is a sendmail convention. */
1826 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1827 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1830 receiving_message = FALSE;
1831 called_as = US"-newaliases";
1834 /* Save the original effective uid for a couple of uses later. It should
1835 normally be root, but in some esoteric environments it may not be. */
1837 original_euid = geteuid();
1839 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1840 to be the same as the real ones. This makes a difference only if Exim is setuid
1841 (or setgid) to something other than root, which could be the case in some
1842 special configurations. */
1844 real_uid = getuid();
1845 real_gid = getgid();
1847 if (real_uid == root_uid)
1849 rv = setgid(real_gid);
1852 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1853 (long int)real_gid, strerror(errno));
1856 rv = setuid(real_uid);
1859 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1860 (long int)real_uid, strerror(errno));
1865 /* If neither the original real uid nor the original euid was root, Exim is
1866 running in an unprivileged state. */
1868 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1870 /* Scan the program's arguments. Some can be dealt with right away; others are
1871 simply recorded for checking and handling afterwards. Do a high-level switch
1872 on the second character (the one after '-'), to save some effort. */
1874 for (i = 1; i < argc; i++)
1876 BOOL badarg = FALSE;
1877 uschar *arg = argv[i];
1881 /* An argument not starting with '-' is the start of a recipients list;
1882 break out of the options-scanning loop. */
1890 /* An option consistion of -- terminates the options */
1892 if (Ustrcmp(arg, "--") == 0)
1894 recipients_arg = i + 1;
1898 /* Handle flagged options */
1900 switchchar = arg[1];
1903 /* Make all -ex options synonymous with -oex arguments, since that
1904 is assumed by various callers. Also make -qR options synonymous with -R
1905 options, as that seems to be required as well. Allow for -qqR too, and
1906 the same for -S options. */
1908 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1909 Ustrncmp(arg+1, "qR", 2) == 0 ||
1910 Ustrncmp(arg+1, "qS", 2) == 0)
1912 switchchar = arg[2];
1915 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1917 switchchar = arg[3];
1919 queue_2stage = TRUE;
1922 /* Make -r synonymous with -f, since it is a documented alias */
1924 else if (arg[1] == 'r') switchchar = 'f';
1926 /* Make -ov synonymous with -v */
1928 else if (Ustrcmp(arg, "-ov") == 0)
1934 /* deal with --option_aliases */
1935 else if (switchchar == '-')
1937 if (Ustrcmp(argrest, "help") == 0)
1939 usage_wanted = TRUE;
1942 else if (Ustrcmp(argrest, "version") == 0)
1949 /* High-level switch on active initial letter */
1954 /* sendmail uses -Ac and -Am to control which .cf file is used;
1957 if (*argrest == '\0') { badarg = TRUE; break; }
1960 BOOL ignore = FALSE;
1965 if (*(argrest + 1) == '\0')
1969 if (!ignore) { badarg = TRUE; break; }
1973 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1974 so has no need of it. */
1977 if (*argrest == 0) i++; /* Skip over the type */
1982 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1984 /* -bd: Run in daemon mode, awaiting SMTP connections.
1985 -bdf: Ditto, but in the foreground.
1988 if (*argrest == 'd')
1990 daemon_listen = TRUE;
1991 if (*(++argrest) == 'f') background_daemon = FALSE;
1992 else if (*argrest != 0) { badarg = TRUE; break; }
1995 /* -be: Run in expansion test mode
1996 -bem: Ditto, but read a message from a file first
1999 else if (*argrest == 'e')
2001 expansion_test = checking = TRUE;
2002 if (argrest[1] == 'm')
2004 if (++i >= argc) { badarg = TRUE; break; }
2005 expansion_test_message = argv[i];
2008 if (argrest[1] != 0) { badarg = TRUE; break; }
2011 /* -bF: Run system filter test */
2013 else if (*argrest == 'F')
2015 filter_test |= checking = FTEST_SYSTEM;
2016 if (*(++argrest) != 0) { badarg = TRUE; break; }
2017 if (++i < argc) filter_test_sfile = argv[i]; else
2019 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2024 /* -bf: Run user filter test
2025 -bfd: Set domain for filter testing
2026 -bfl: Set local part for filter testing
2027 -bfp: Set prefix for filter testing
2028 -bfs: Set suffix for filter testing
2031 else if (*argrest == 'f')
2033 if (*(++argrest) == 0)
2035 filter_test |= checking = FTEST_USER;
2036 if (++i < argc) filter_test_ufile = argv[i]; else
2038 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2046 fprintf(stderr, "exim: string expected after %s\n", arg);
2049 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2050 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2051 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2052 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2053 else { badarg = TRUE; break; }
2057 /* -bh: Host checking - an IP address must follow. */
2059 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2061 if (++i >= argc) { badarg = TRUE; break; }
2062 sender_host_address = argv[i];
2063 host_checking = checking = log_testing_mode = TRUE;
2064 host_checking_callout = argrest[1] == 'c';
2065 message_logs = FALSE;
2068 /* -bi: This option is used by sendmail to initialize *the* alias file,
2069 though it has the -oA option to specify a different file. Exim has no
2070 concept of *the* alias file, but since Sun's YP make script calls
2071 sendmail this way, some support must be provided. */
2073 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2075 /* -bI: provide information, of the type to follow after a colon.
2076 This is an Exim flag. */
2078 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2080 uschar *p = &argrest[2];
2081 info_flag = CMDINFO_HELP;
2084 if (strcmpic(p, CUS"sieve") == 0)
2086 info_flag = CMDINFO_SIEVE;
2089 else if (strcmpic(p, CUS"dscp") == 0)
2091 info_flag = CMDINFO_DSCP;
2094 else if (strcmpic(p, CUS"help") == 0)
2101 /* -bm: Accept and deliver message - the default option. Reinstate
2102 receiving_message, which got turned off for all -b options. */
2104 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2106 /* -bmalware: test the filename given for malware */
2108 else if (Ustrcmp(argrest, "malware") == 0)
2110 if (++i >= argc) { badarg = TRUE; break; }
2112 malware_test_file = argv[i];
2115 /* -bnq: For locally originating messages, do not qualify unqualified
2116 addresses. In the envelope, this causes errors; in header lines they
2119 else if (Ustrcmp(argrest, "nq") == 0)
2121 allow_unqualified_sender = FALSE;
2122 allow_unqualified_recipient = FALSE;
2125 /* -bpxx: List the contents of the mail queue, in various forms. If
2126 the option is -bpc, just a queue count is needed. Otherwise, if the
2127 first letter after p is r, then order is random. */
2129 else if (*argrest == 'p')
2131 if (*(++argrest) == 'c')
2134 if (*(++argrest) != 0) badarg = TRUE;
2138 if (*argrest == 'r')
2140 list_queue_option = 8;
2143 else list_queue_option = 0;
2147 /* -bp: List the contents of the mail queue, top-level only */
2149 if (*argrest == 0) {}
2151 /* -bpu: List the contents of the mail queue, top-level undelivered */
2153 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2155 /* -bpa: List the contents of the mail queue, including all delivered */
2157 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2159 /* Unknown after -bp[r] */
2169 /* -bP: List the configuration variables given as the address list.
2170 Force -v, so configuration errors get displayed. */
2172 else if (Ustrcmp(argrest, "P") == 0)
2174 /* -bP config: we need to setup here, because later,
2175 * when list_options is checked, the config is read already */
2176 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2179 readconf_save_config(version_string);
2183 list_options = TRUE;
2184 debug_selector |= D_v;
2185 debug_file = stderr;
2189 /* -brt: Test retry configuration lookup */
2191 else if (Ustrcmp(argrest, "rt") == 0)
2194 test_retry_arg = i + 1;
2198 /* -brw: Test rewrite configuration */
2200 else if (Ustrcmp(argrest, "rw") == 0)
2203 test_rewrite_arg = i + 1;
2207 /* -bS: Read SMTP commands on standard input, but produce no replies -
2208 all errors are reported by sending messages. */
2210 else if (Ustrcmp(argrest, "S") == 0)
2211 smtp_input = smtp_batched_input = receiving_message = TRUE;
2213 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2214 on standard output. */
2216 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2218 /* -bt: address testing mode */
2220 else if (Ustrcmp(argrest, "t") == 0)
2221 address_test_mode = checking = log_testing_mode = TRUE;
2223 /* -bv: verify addresses */
2225 else if (Ustrcmp(argrest, "v") == 0)
2226 verify_address_mode = checking = log_testing_mode = TRUE;
2228 /* -bvs: verify sender addresses */
2230 else if (Ustrcmp(argrest, "vs") == 0)
2232 verify_address_mode = checking = log_testing_mode = TRUE;
2233 verify_as_sender = TRUE;
2236 /* -bV: Print version string and support details */
2238 else if (Ustrcmp(argrest, "V") == 0)
2240 printf("Exim version %s #%s built %s\n", version_string,
2241 version_cnumber, version_date);
2242 printf("%s\n", CS version_copyright);
2243 version_printed = TRUE;
2244 show_whats_supported(stdout);
2245 log_testing_mode = TRUE;
2248 /* -bw: inetd wait mode, accept a listening socket as stdin */
2250 else if (*argrest == 'w')
2252 inetd_wait_mode = TRUE;
2253 background_daemon = FALSE;
2254 daemon_listen = TRUE;
2255 if (*(++argrest) != '\0')
2257 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2258 if (inetd_wait_timeout <= 0)
2260 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2270 /* -C: change configuration file list; ignore if it isn't really
2271 a change! Enforce a prefix check if required. */
2276 if(++i < argc) argrest = argv[i]; else
2277 { badarg = TRUE; break; }
2279 if (Ustrcmp(config_main_filelist, argrest) != 0)
2281 #ifdef ALT_CONFIG_PREFIX
2283 int len = Ustrlen(ALT_CONFIG_PREFIX);
2284 uschar *list = argrest;
2286 while((filename = string_nextinlist(&list, &sep, big_buffer,
2287 big_buffer_size)) != NULL)
2289 if ((Ustrlen(filename) < len ||
2290 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2291 Ustrstr(filename, "/../") != NULL) &&
2292 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2294 fprintf(stderr, "-C Permission denied\n");
2299 if (real_uid != root_uid)
2301 #ifdef TRUSTED_CONFIG_LIST
2303 if (real_uid != exim_uid
2304 #ifdef CONFIGURE_OWNER
2305 && real_uid != config_uid
2308 trusted_config = FALSE;
2311 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2314 struct stat statbuf;
2316 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2317 (statbuf.st_uid != root_uid /* owner not root */
2318 #ifdef CONFIGURE_OWNER
2319 && statbuf.st_uid != config_uid /* owner not the special one */
2322 (statbuf.st_gid != root_gid /* group not root */
2323 #ifdef CONFIGURE_GROUP
2324 && statbuf.st_gid != config_gid /* group not the special one */
2326 && (statbuf.st_mode & 020) != 0 /* group writeable */
2328 (statbuf.st_mode & 2) != 0) /* world writeable */
2330 trusted_config = FALSE;
2335 /* Well, the trust list at least is up to scratch... */
2336 void *reset_point = store_get(0);
2337 uschar *trusted_configs[32];
2341 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2343 uschar *start = big_buffer, *nl;
2344 while (*start && isspace(*start))
2348 nl = Ustrchr(start, '\n');
2351 trusted_configs[nr_configs++] = string_copy(start);
2352 if (nr_configs == 32)
2360 const uschar *list = argrest;
2362 while (trusted_config && (filename = string_nextinlist(&list,
2363 &sep, big_buffer, big_buffer_size)) != NULL)
2365 for (i=0; i < nr_configs; i++)
2367 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2370 if (i == nr_configs)
2372 trusted_config = FALSE;
2376 store_reset(reset_point);
2380 /* No valid prefixes found in trust_list file. */
2381 trusted_config = FALSE;
2387 /* Could not open trust_list file. */
2388 trusted_config = FALSE;
2392 /* Not root; don't trust config */
2393 trusted_config = FALSE;
2397 config_main_filelist = argrest;
2398 config_changed = TRUE;
2403 /* -D: set up a macro definition */
2406 #ifdef DISABLE_D_OPTION
2407 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2412 macro_item *mlast = NULL;
2415 uschar *s = argrest;
2417 while (isspace(*s)) s++;
2419 if (*s < 'A' || *s > 'Z')
2421 fprintf(stderr, "exim: macro name set by -D must start with "
2422 "an upper case letter\n");
2426 while (isalnum(*s) || *s == '_')
2428 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2432 if (ptr == 0) { badarg = TRUE; break; }
2433 while (isspace(*s)) s++;
2436 if (*s++ != '=') { badarg = TRUE; break; }
2437 while (isspace(*s)) s++;
2440 for (m = macros; m != NULL; m = m->next)
2442 if (Ustrcmp(m->name, name) == 0)
2444 fprintf(stderr, "exim: duplicated -D in command line\n");
2450 m = store_get(sizeof(macro_item) + Ustrlen(name));
2452 m->command_line = TRUE;
2453 if (mlast == NULL) macros = m; else mlast->next = m;
2454 Ustrcpy(m->name, name);
2455 m->replacement = string_copy(s);
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()) && /* 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 && (!trusted_config || macros != NULL) &&
4033 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");
4043 /* Start up Perl interpreter if Perl support is configured and there is a
4044 perl_startup option, and the configuration or the command line specifies
4045 initializing starting. Note that the global variables are actually called
4046 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4049 if (perl_start_option != 0)
4050 opt_perl_at_start = (perl_start_option > 0);
4051 if (opt_perl_at_start && opt_perl_startup != NULL)
4054 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4055 errstr = init_perl(opt_perl_startup);
4058 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4059 return EXIT_FAILURE;
4061 opt_perl_started = TRUE;
4063 #endif /* EXIM_PERL */
4065 /* Log the arguments of the call if the configuration file said so. This is
4066 a debugging feature for finding out what arguments certain MUAs actually use.
4067 Don't attempt it if logging is disabled, or if listing variables or if
4068 verifying/testing addresses or expansions. */
4070 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4071 && really_exim && !list_options && !checking)
4074 uschar *p = big_buffer;
4075 Ustrcpy(p, "cwd= (failed)");
4077 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4080 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4082 for (i = 0; i < argc; i++)
4084 int len = Ustrlen(argv[i]);
4085 const uschar *printing;
4087 if (p + len + 8 >= big_buffer + big_buffer_size)
4090 log_write(0, LOG_MAIN, "%s", big_buffer);
4091 Ustrcpy(big_buffer, "...");
4094 printing = string_printing(argv[i]);
4095 if (printing[0] == 0) quote = US"\""; else
4097 const uschar *pp = printing;
4099 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4101 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4102 (p - big_buffer) - 4), printing, quote);
4106 if (LOGGING(arguments))
4107 log_write(0, LOG_MAIN, "%s", big_buffer);
4109 debug_printf("%s\n", big_buffer);
4112 /* Set the working directory to be the top-level spool directory. We don't rely
4113 on this in the code, which always uses fully qualified names, but it's useful
4114 for core dumps etc. Don't complain if it fails - the spool directory might not
4115 be generally accessible and calls with the -C option (and others) have lost
4116 privilege by now. Before the chdir, we try to ensure that the directory exists.
4119 if (Uchdir(spool_directory) != 0)
4122 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4123 dummy = /* quieten compiler */ Uchdir(spool_directory);
4126 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4127 alias file. Exim doesn't have such a concept, but this call is screwed into
4128 Sun's YP makefiles. Handle this by calling a configured script, as the real
4129 user who called Exim. The -oA option can be used to pass an argument to the
4134 (void)fclose(config_file);
4135 if (bi_command != NULL)
4139 argv[i++] = bi_command;
4140 if (alias_arg != NULL) argv[i++] = alias_arg;
4143 setgroups(group_count, group_list);
4144 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4146 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4147 (argv[1] == NULL)? US"" : argv[1]);
4149 execv(CS argv[0], (char *const *)argv);
4150 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4155 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4160 /* We moved the admin/trusted check to be immediately after reading the
4161 configuration file. We leave these prints here to ensure that syslog setup,
4162 logfile setup, and so on has already happened. */
4164 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4165 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4167 /* Only an admin user may start the daemon or force a queue run in the default
4168 configuration, but the queue run restriction can be relaxed. Only an admin
4169 user may request that a message be returned to its sender forthwith. Only an
4170 admin user may specify a debug level greater than D_v (because it might show
4171 passwords, etc. in lookup queries). Only an admin user may request a queue
4172 count. Only an admin user can use the test interface to scan for email
4173 (because Exim will be in the spool dir and able to look at mails). */
4177 BOOL debugset = (debug_selector & ~D_v) != 0;
4178 if (deliver_give_up || daemon_listen || malware_test_file ||
4179 (count_queue && queue_list_requires_admin) ||
4180 (list_queue && queue_list_requires_admin) ||
4181 (queue_interval >= 0 && prod_requires_admin) ||
4182 (debugset && !running_in_test_harness))
4184 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4189 /* If the real user is not root or the exim uid, the argument for passing
4190 in an open TCP/IP connection for another message is not permitted, nor is
4191 running with the -N option for any delivery action, unless this call to exim is
4192 one that supplied an input message, or we are using a patched exim for
4193 regression testing. */
4195 if (real_uid != root_uid && real_uid != exim_uid &&
4196 (continue_hostname != NULL ||
4198 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4199 )) && !running_in_test_harness)
4201 fprintf(stderr, "exim: Permission denied\n");
4202 return EXIT_FAILURE;
4205 /* If the caller is not trusted, certain arguments are ignored when running for
4206 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4207 Note that authority for performing certain actions on messages is tested in the
4208 queue_action() function. */
4210 if (!trusted_caller && !checking)
4212 sender_host_name = sender_host_address = interface_address =
4213 sender_ident = received_protocol = NULL;
4214 sender_host_port = interface_port = 0;
4215 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4218 /* If a sender host address is set, extract the optional port number off the
4219 end of it and check its syntax. Do the same thing for the interface address.
4220 Exim exits if the syntax is bad. */
4224 if (sender_host_address != NULL)
4225 sender_host_port = check_port(sender_host_address);
4226 if (interface_address != NULL)
4227 interface_port = check_port(interface_address);
4230 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4235 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4236 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4240 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4241 return EXIT_FAILURE;
4245 /* If an SMTP message is being received check to see if the standard input is a
4246 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4247 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4252 union sockaddr_46 inetd_sock;
4253 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4254 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4256 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4257 if (family == AF_INET || family == AF_INET6)
4259 union sockaddr_46 interface_sock;
4260 size = sizeof(interface_sock);
4262 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4263 interface_address = host_ntoa(-1, &interface_sock, NULL,
4266 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4268 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4271 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4272 NULL, &sender_host_port);
4273 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4274 "inetd is not supported when mua_wrapper is set");
4279 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4280 return EXIT_FAILURE;
4286 /* If the load average is going to be needed while receiving a message, get it
4287 now for those OS that require the first call to os_getloadavg() to be done as
4288 root. There will be further calls later for each message received. */
4290 #ifdef LOAD_AVG_NEEDS_ROOT
4291 if (receiving_message &&
4292 (queue_only_load >= 0 ||
4293 (is_inetd && smtp_load_reserve >= 0)
4296 load_average = OS_GETLOADAVG();
4300 /* The queue_only configuration option can be overridden by -odx on the command
4301 line, except that if queue_only_override is false, queue_only cannot be unset
4302 from the command line. */
4304 if (queue_only_set && (queue_only_override || arg_queue_only))
4305 queue_only = arg_queue_only;
4307 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4310 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4311 if (arg_smtp_receive_timeout >= 0)
4312 smtp_receive_timeout = arg_smtp_receive_timeout;
4314 /* If Exim was started with root privilege, unless we have already removed the
4315 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4316 except when starting the daemon or doing some kind of delivery or address
4317 testing (-bt). These are the only cases when root need to be retained. We run
4318 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4319 retained only for starting the daemon. We always do the initgroups() in this
4320 situation (controlled by the TRUE below), in order to be as close as possible
4321 to the state Exim usually runs in. */
4323 if (!unprivileged && /* originally had root AND */
4324 !removed_privilege && /* still got root AND */
4325 !daemon_listen && /* not starting the daemon */
4326 queue_interval <= 0 && /* (either kind of daemon) */
4328 deliver_drop_privilege || /* requested unprivileged */
4330 queue_interval < 0 && /* not running the queue */
4331 (msg_action_arg < 0 || /* and */
4332 msg_action != MSG_DELIVER) && /* not delivering and */
4333 (!checking || !address_test_mode) /* not address checking */
4337 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4340 /* When we are retaining a privileged uid, we still change to the exim gid. */
4345 rv = setgid(exim_gid);
4346 /* Impact of failure is that some stuff might end up with an incorrect group.
4347 We track this for failures from root, since any attempt to change privilege
4348 by root should succeed and failures should be examined. For non-root,
4349 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4350 no need to complain then. */
4353 if (!(unprivileged || removed_privilege))
4356 "exim: changing group failed: %s\n", strerror(errno));
4360 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4361 (long int)exim_gid, strerror(errno));
4365 /* Handle a request to scan a file for malware */
4366 if (malware_test_file)
4368 #ifdef WITH_CONTENT_SCAN
4370 set_process_info("scanning file for malware");
4371 result = malware_in_file(malware_test_file);
4374 printf("No malware found.\n");
4379 printf("Malware lookup returned non-okay/fail: %d\n", result);
4383 printf("Malware found: %s\n", malware_name);
4385 printf("Malware scan detected malware of unknown name.\n");
4387 printf("Malware scanning not enabled at compile time.\n");
4392 /* Handle a request to list the delivery queue */
4396 set_process_info("listing the queue");
4397 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4401 /* Handle a request to count the delivery queue */
4405 set_process_info("counting the queue");
4410 /* Handle actions on specific messages, except for the force delivery and
4411 message load actions, which are done below. Some actions take a whole list of
4412 message ids, which are known to continue up to the end of the arguments. Others
4413 take a single message id and then operate on the recipients list. */
4415 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4417 int yield = EXIT_SUCCESS;
4418 set_process_info("acting on specified messages");
4420 if (!one_msg_action)
4422 for (i = msg_action_arg; i < argc; i++)
4423 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4424 yield = EXIT_FAILURE;
4427 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4428 recipients_arg)) yield = EXIT_FAILURE;
4432 /* We used to set up here to skip reading the ACL section, on
4433 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4434 Now, since the intro of the ${acl } expansion, ACL definitions may be
4435 needed in transports so we lost the optimisation. */
4439 /* The configuration data will have been read into POOL_PERM because we won't
4440 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4441 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4442 configuration were read into POOL_MAIN, because we don't do any resets till
4443 later on. However, it seems right, and it does ensure that both pools get used.
4446 store_pool = POOL_MAIN;
4448 /* Handle the -brt option. This is for checking out retry configurations.
4449 The next three arguments are a domain name or a complete address, and
4450 optionally two error numbers. All it does is to call the function that
4451 scans the retry configuration data. */
4453 if (test_retry_arg >= 0)
4455 retry_config *yield;
4456 int basic_errno = 0;
4460 if (test_retry_arg >= argc)
4462 printf("-brt needs a domain or address argument\n");
4463 exim_exit(EXIT_FAILURE);
4465 s1 = argv[test_retry_arg++];
4468 /* If the first argument contains no @ and no . it might be a local user
4469 or it might be a single-component name. Treat as a domain. */
4471 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4473 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4474 "being \ntreated as a one-component domain, not as a local part.\n\n",
4478 /* There may be an optional second domain arg. */
4480 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4481 s2 = argv[test_retry_arg++];
4483 /* The final arg is an error name */
4485 if (test_retry_arg < argc)
4487 uschar *ss = argv[test_retry_arg];
4489 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4492 printf("%s\n", CS error);
4493 return EXIT_FAILURE;
4496 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4497 code > 100 as an error is for matching codes to the decade. Turn them into
4498 a real error code, off the decade. */
4500 if (basic_errno == ERRNO_MAIL4XX ||
4501 basic_errno == ERRNO_RCPT4XX ||
4502 basic_errno == ERRNO_DATA4XX)
4504 int code = (more_errno >> 8) & 255;
4506 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4507 else if (code > 100)
4508 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4512 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4513 if (yield == NULL) printf("No retry information found\n"); else
4516 more_errno = yield->more_errno;
4517 printf("Retry rule: %s ", yield->pattern);
4519 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4521 printf("quota%s%s ",
4522 (more_errno > 0)? "_" : "",
4523 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4525 else if (yield->basic_errno == ECONNREFUSED)
4527 printf("refused%s%s ",
4528 (more_errno > 0)? "_" : "",
4529 (more_errno == 'M')? "MX" :
4530 (more_errno == 'A')? "A" : "");
4532 else if (yield->basic_errno == ETIMEDOUT)
4535 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4537 if (more_errno != 0) printf("_%s",
4538 (more_errno == 'M')? "MX" : "A");
4541 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4542 printf("auth_failed ");
4545 for (r = yield->rules; r != NULL; r = r->next)
4547 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4548 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4554 printf(",%d.", x/1000);
4568 exim_exit(EXIT_SUCCESS);
4571 /* Handle a request to list one or more configuration options */
4572 /* If -n was set, we suppress some information */
4576 set_process_info("listing variables");
4577 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4578 else for (i = recipients_arg; i < argc; i++)
4581 (Ustrcmp(argv[i], "router") == 0 ||
4582 Ustrcmp(argv[i], "transport") == 0 ||
4583 Ustrcmp(argv[i], "authenticator") == 0 ||
4584 Ustrcmp(argv[i], "macro") == 0 ||
4585 Ustrcmp(argv[i], "environment") == 0))
4587 readconf_print(argv[i+1], argv[i], flag_n);
4590 else readconf_print(argv[i], NULL, flag_n);
4592 exim_exit(EXIT_SUCCESS);
4597 set_process_info("listing config");
4598 readconf_print(US"config", NULL, flag_n);
4599 exim_exit(EXIT_SUCCESS);
4603 /* Initialise subsystems as required */
4604 #ifndef DISABLE_DKIM
4610 /* Handle a request to deliver one or more messages that are already on the
4611 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4612 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4614 Delivery of specific messages is typically used for a small number when
4615 prodding by hand (when the option forced_delivery will be set) or when
4616 re-execing to regain root privilege. Each message delivery must happen in a
4617 separate process, so we fork a process for each one, and run them sequentially
4618 so that debugging output doesn't get intertwined, and to avoid spawning too
4619 many processes if a long list is given. However, don't fork for the last one;
4620 this saves a process in the common case when Exim is called to deliver just one
4623 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4625 if (prod_requires_admin && !admin_user)
4627 fprintf(stderr, "exim: Permission denied\n");
4628 exim_exit(EXIT_FAILURE);
4630 set_process_info("delivering specified messages");
4631 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4632 for (i = msg_action_arg; i < argc; i++)
4637 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4638 else if ((pid = fork()) == 0)
4640 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4641 _exit(EXIT_SUCCESS);
4645 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4647 exim_exit(EXIT_FAILURE);
4651 exim_exit(EXIT_SUCCESS);
4655 /* If only a single queue run is requested, without SMTP listening, we can just
4656 turn into a queue runner, with an optional starting message id. */
4658 if (queue_interval == 0 && !daemon_listen)
4660 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4661 (start_queue_run_id == NULL)? US"" : US" starting at ",
4662 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4663 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4664 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4666 set_process_info("running the '%s' queue (single queue run)", queue_name);
4668 set_process_info("running the queue (single queue run)");
4669 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4670 exim_exit(EXIT_SUCCESS);
4674 /* Find the login name of the real user running this process. This is always
4675 needed when receiving a message, because it is written into the spool file. It
4676 may also be used to construct a from: or a sender: header, and in this case we
4677 need the user's full name as well, so save a copy of it, checked for RFC822
4678 syntax and munged if necessary, if it hasn't previously been set by the -F
4679 argument. We may try to get the passwd entry more than once, in case NIS or
4680 other delays are in evidence. Save the home directory for use in filter testing
4685 if ((pw = getpwuid(real_uid)) != NULL)
4687 originator_login = string_copy(US pw->pw_name);
4688 originator_home = string_copy(US pw->pw_dir);
4690 /* If user name has not been set by -F, set it from the passwd entry
4691 unless -f has been used to set the sender address by a trusted user. */
4693 if (originator_name == NULL)
4695 if (sender_address == NULL ||
4696 (!trusted_caller && filter_test == FTEST_NONE))
4698 uschar *name = US pw->pw_gecos;
4699 uschar *amp = Ustrchr(name, '&');
4702 /* Most Unix specify that a '&' character in the gecos field is
4703 replaced by a copy of the login name, and some even specify that
4704 the first character should be upper cased, so that's what we do. */
4709 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4710 amp - name, name, &loffset, originator_login, amp + 1);
4711 buffer[loffset] = toupper(buffer[loffset]);
4715 /* If a pattern for matching the gecos field was supplied, apply
4716 it and then expand the name string. */
4718 if (gecos_pattern != NULL && gecos_name != NULL)
4721 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4723 if (regex_match_and_setup(re, name, 0, -1))
4725 uschar *new_name = expand_string(gecos_name);
4727 if (new_name != NULL)
4729 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4730 "gecos field \"%s\"\n", new_name, name);
4733 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4734 "\"%s\": %s\n", gecos_name, expand_string_message);
4736 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4737 "gecos field \"%s\"\n", gecos_pattern, name);
4738 store_free((void *)re);
4740 originator_name = string_copy(name);
4743 /* A trusted caller has used -f but not -F */
4745 else originator_name = US"";
4748 /* Break the retry loop */
4753 if (++i > finduser_retries) break;
4757 /* If we cannot get a user login, log the incident and give up, unless the
4758 configuration specifies something to use. When running in the test harness,
4759 any setting of unknown_login overrides the actual name. */
4761 if (originator_login == NULL || running_in_test_harness)
4763 if (unknown_login != NULL)
4765 originator_login = expand_string(unknown_login);
4766 if (originator_name == NULL && unknown_username != NULL)
4767 originator_name = expand_string(unknown_username);
4768 if (originator_name == NULL) originator_name = US"";
4770 if (originator_login == NULL)
4771 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4775 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4778 originator_name = string_copy(parse_fix_phrase(originator_name,
4779 Ustrlen(originator_name), big_buffer, big_buffer_size));
4781 /* If a message is created by this call of Exim, the uid/gid of its originator
4782 are those of the caller. These values are overridden if an existing message is
4783 read in from the spool. */
4785 originator_uid = real_uid;
4786 originator_gid = real_gid;
4788 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4789 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4791 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4792 returns. We leave this till here so that the originator_ fields are available
4793 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4796 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4800 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4801 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4802 "mua_wrapper is set");
4807 /* If the sender ident has not been set (by a trusted caller) set it to
4808 the caller. This will get overwritten below for an inetd call. If a trusted
4809 caller has set it empty, unset it. */
4811 if (sender_ident == NULL) sender_ident = originator_login;
4812 else if (sender_ident[0] == 0) sender_ident = NULL;
4814 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4815 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4816 originator_* variables set. */
4818 if (test_rewrite_arg >= 0)
4820 really_exim = FALSE;
4821 if (test_rewrite_arg >= argc)
4823 printf("-brw needs an address argument\n");
4824 exim_exit(EXIT_FAILURE);
4826 rewrite_test(argv[test_rewrite_arg]);
4827 exim_exit(EXIT_SUCCESS);
4830 /* A locally-supplied message is considered to be coming from a local user
4831 unless a trusted caller supplies a sender address with -f, or is passing in the
4832 message via SMTP (inetd invocation or otherwise). */
4834 if ((sender_address == NULL && !smtp_input) ||
4835 (!trusted_caller && filter_test == FTEST_NONE))
4837 sender_local = TRUE;
4839 /* A trusted caller can supply authenticated_sender and authenticated_id
4840 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4841 defaults except when host checking. */
4843 if (authenticated_sender == NULL && !host_checking)
4844 authenticated_sender = string_sprintf("%s@%s", originator_login,
4845 qualify_domain_sender);
4846 if (authenticated_id == NULL && !host_checking)
4847 authenticated_id = originator_login;
4850 /* Trusted callers are always permitted to specify the sender address.
4851 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4852 is specified is the empty address. However, if a trusted caller does not
4853 specify a sender address for SMTP input, we leave sender_address unset. This
4854 causes the MAIL commands to be honoured. */
4856 if ((!smtp_input && sender_address == NULL) ||
4857 !receive_check_set_sender(sender_address))
4859 /* Either the caller is not permitted to set a general sender, or this is
4860 non-SMTP input and the trusted caller has not set a sender. If there is no
4861 sender, or if a sender other than <> is set, override with the originator's
4862 login (which will get qualified below), except when checking things. */
4864 if (sender_address == NULL /* No sender_address set */
4866 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4867 !checking)) /* Not running tests, including filter tests */
4869 sender_address = originator_login;
4870 sender_address_forced = FALSE;
4871 sender_address_domain = 0;
4875 /* Remember whether an untrusted caller set the sender address */
4877 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4879 /* Ensure that the sender address is fully qualified unless it is the empty
4880 address, which indicates an error message, or doesn't exist (root caller, smtp
4881 interface, no -f argument). */
4883 if (sender_address != NULL && sender_address[0] != 0 &&
4884 sender_address_domain == 0)
4885 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4886 qualify_domain_sender);
4888 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4890 /* Handle a request to verify a list of addresses, or test them for delivery.
4891 This must follow the setting of the sender address, since routers can be
4892 predicated upon the sender. If no arguments are given, read addresses from
4893 stdin. Set debug_level to at least D_v to get full output for address testing.
4896 if (verify_address_mode || address_test_mode)
4899 int flags = vopt_qualify;
4901 if (verify_address_mode)
4903 if (!verify_as_sender) flags |= vopt_is_recipient;
4904 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4909 flags |= vopt_is_recipient;
4910 debug_selector |= D_v;
4911 debug_file = stderr;
4912 debug_fd = fileno(debug_file);
4913 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4916 if (recipients_arg < argc)
4918 while (recipients_arg < argc)
4920 uschar *s = argv[recipients_arg++];
4923 BOOL finished = FALSE;
4924 uschar *ss = parse_find_address_end(s, FALSE);
4925 if (*ss == ',') *ss = 0; else finished = TRUE;
4926 test_address(s, flags, &exit_value);
4929 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4936 uschar *s = get_stdinput(NULL, NULL);
4937 if (s == NULL) break;
4938 test_address(s, flags, &exit_value);
4942 exim_exit(exit_value);
4945 /* Handle expansion checking. Either expand items on the command line, or read
4946 from stdin if there aren't any. If -Mset was specified, load the message so
4947 that its variables can be used, but restrict this facility to admin users.
4948 Otherwise, if -bem was used, read a message from stdin. */
4952 dns_init(FALSE, FALSE, FALSE);
4953 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4955 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4958 fprintf(stderr, "exim: permission denied\n");
4961 message_id = argv[msg_action_arg];
4962 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4963 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4964 printf ("Failed to load message datafile %s\n", message_id);
4965 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4966 printf ("Failed to load message %s\n", message_id);
4969 /* Read a test message from a file. We fudge it up to be on stdin, saving
4970 stdin itself for later reading of expansion strings. */
4972 else if (expansion_test_message != NULL)
4974 int save_stdin = dup(0);
4975 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4978 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4980 return EXIT_FAILURE;
4983 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4984 message_ended = END_NOTENDED;
4985 read_message_body(receive_msg(extract_recipients));
4986 message_linecount += body_linecount;
4987 (void)dup2(save_stdin, 0);
4988 (void)close(save_stdin);
4989 clearerr(stdin); /* Required by Darwin */
4992 /* Allow $recipients for this testing */
4994 enable_dollar_recipients = TRUE;
4996 /* Expand command line items */
4998 if (recipients_arg < argc)
5000 while (recipients_arg < argc)
5002 uschar *s = argv[recipients_arg++];
5003 uschar *ss = expand_string(s);
5004 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
5005 else printf("%s\n", CS ss);
5013 char *(*fn_readline)(const char *) = NULL;
5014 void (*fn_addhist)(const char *) = NULL;
5017 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5023 uschar *source = get_stdinput(fn_readline, fn_addhist);
5024 if (source == NULL) break;
5025 ss = expand_string(source);
5027 printf ("Failed: %s\n", expand_string_message);
5028 else printf("%s\n", CS ss);
5032 if (dlhandle != NULL) dlclose(dlhandle);
5036 /* The data file will be open after -Mset */
5038 if (deliver_datafile >= 0)
5040 (void)close(deliver_datafile);
5041 deliver_datafile = -1;
5044 exim_exit(EXIT_SUCCESS);
5048 /* The active host name is normally the primary host name, but it can be varied
5049 for hosts that want to play several parts at once. We need to ensure that it is
5050 set for host checking, and for receiving messages. */
5052 smtp_active_hostname = primary_hostname;
5053 if (raw_active_hostname != NULL)
5055 uschar *nah = expand_string(raw_active_hostname);
5058 if (!expand_string_forcedfail)
5059 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5060 "(smtp_active_hostname): %s", raw_active_hostname,
5061 expand_string_message);
5063 else if (nah[0] != 0) smtp_active_hostname = nah;
5066 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5067 given IP address so that the blocking and relay configuration can be tested.
5068 Unless a sender_ident was set by -oMt, we discard it (the default is the
5069 caller's login name). An RFC 1413 call is made only if we are running in the
5070 test harness and an incoming interface and both ports are specified, because
5071 there is no TCP/IP call to find the ident for. */
5078 if (!sender_ident_set)
5080 sender_ident = NULL;
5081 if (running_in_test_harness && sender_host_port != 0 &&
5082 interface_address != NULL && interface_port != 0)
5083 verify_get_ident(1413);
5086 /* In case the given address is a non-canonical IPv6 address, canonicize
5087 it. The code works for both IPv4 and IPv6, as it happens. */
5089 size = host_aton(sender_host_address, x);
5090 sender_host_address = store_get(48); /* large enough for full IPv6 */
5091 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5093 /* Now set up for testing */
5095 host_build_sender_fullhost();
5099 sender_local = FALSE;
5100 sender_host_notsocket = TRUE;
5101 debug_file = stderr;
5102 debug_fd = fileno(debug_file);
5103 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5104 "**** but without any ident (RFC 1413) callback.\n"
5105 "**** This is not for real!\n\n",
5106 sender_host_address);
5108 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5109 if (verify_check_host(&hosts_connection_nolog) == OK)
5110 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5111 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5113 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5114 because a log line has already been written for all its failure exists
5115 (usually "connection refused: <reason>") and writing another one is
5116 unnecessary clutter. */
5118 if (smtp_start_session())
5120 reset_point = store_get(0);
5123 store_reset(reset_point);
5124 if (smtp_setup_msg() <= 0) break;
5125 if (!receive_msg(FALSE)) break;
5129 exim_exit(EXIT_SUCCESS);
5133 /* Arrange for message reception if recipients or SMTP were specified;
5134 otherwise complain unless a version print (-bV) happened or this is a filter
5135 verification test or info dump.
5136 In the former case, show the configuration file name. */
5138 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5140 if (version_printed)
5142 printf("Configuration file is %s\n", config_main_filename);
5143 return EXIT_SUCCESS;
5146 if (info_flag != CMDINFO_NONE)
5148 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5149 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5152 if (filter_test == FTEST_NONE)
5153 exim_usage(called_as);
5157 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5158 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5159 that we are not called from inetd, because that is rejected above. The
5160 following configuration settings are forced here:
5162 (1) Synchronous delivery (-odi)
5163 (2) Errors to stderr (-oep == -oeq)
5164 (3) No parallel remote delivery
5165 (4) Unprivileged delivery
5167 We don't force overall queueing options because there are several of them;
5168 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5169 to override any SMTP queueing. */
5173 synchronous_delivery = TRUE;
5174 arg_error_handling = ERRORS_STDERR;
5175 remote_max_parallel = 1;
5176 deliver_drop_privilege = TRUE;
5178 queue_smtp_domains = NULL;
5180 message_utf8_downconvert = -1; /* convert-if-needed */
5185 /* Prepare to accept one or more new messages on the standard input. When a
5186 message has been read, its id is returned in message_id[]. If doing immediate
5187 delivery, we fork a delivery process for each received message, except for the
5188 last one, where we can save a process switch.
5190 It is only in non-smtp mode that error_handling is allowed to be changed from
5191 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5192 sendmail error modes other than -oem ever actually used? Later: yes.) */
5194 if (!smtp_input) error_handling = arg_error_handling;
5196 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5197 logging being sent down the socket and make an identd call to get the
5202 (void)fclose(stderr);
5203 exim_nullstd(); /* Re-open to /dev/null */
5204 verify_get_ident(IDENT_PORT);
5205 host_build_sender_fullhost();
5206 set_process_info("handling incoming connection from %s via inetd",
5210 /* If the sender host address has been set, build sender_fullhost if it hasn't
5211 already been done (which it will have been for inetd). This caters for the
5212 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5213 so that the test for IP options is skipped for -bs input. */
5215 if (sender_host_address != NULL && sender_fullhost == NULL)
5217 host_build_sender_fullhost();
5218 set_process_info("handling incoming connection from %s via -oMa",
5220 sender_host_notsocket = TRUE;
5223 /* Otherwise, set the sender host as unknown except for inetd calls. This
5224 prevents host checking in the case of -bs not from inetd and also for -bS. */
5226 else if (!is_inetd) sender_host_unknown = TRUE;
5228 /* If stdout does not exist, then dup stdin to stdout. This can happen
5229 if exim is started from inetd. In this case fd 0 will be set to the socket,
5230 but fd 1 will not be set. This also happens for passed SMTP channels. */
5232 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5234 /* Set up the incoming protocol name and the state of the program. Root is
5235 allowed to force received protocol via the -oMr option above. If we have come
5236 via inetd, the process info has already been set up. We don't set
5237 received_protocol here for smtp input, as it varies according to
5238 batch/HELO/EHLO/AUTH/TLS. */
5242 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5243 smtp_batched_input? "batched " : "",
5244 (sender_address!= NULL)? sender_address : originator_login);
5248 if (received_protocol == NULL)
5249 received_protocol = string_sprintf("local%s", called_as);
5250 set_process_info("accepting a local non-SMTP message from <%s>",
5254 /* Initialize the session_local_queue-only flag (this will be ignored if
5255 mua_wrapper is set) */
5258 session_local_queue_only = queue_only;
5260 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5261 the spool if so configured. On failure, we must not attempt to send an error
5262 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5263 error code is given.) */
5265 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5267 fprintf(stderr, "exim: insufficient disk space\n");
5268 return EXIT_FAILURE;
5271 /* If this is smtp input of any kind, real or batched, handle the start of the
5274 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5275 because a log line has already been written for all its failure exists
5276 (usually "connection refused: <reason>") and writing another one is
5277 unnecessary clutter. */
5283 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5284 if (verify_check_host(&hosts_connection_nolog) == OK)
5285 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5286 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5287 if (!smtp_start_session())
5290 exim_exit(EXIT_SUCCESS);
5294 /* Otherwise, set up the input size limit here. */
5298 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5299 if (expand_string_message != NULL)
5301 if (thismessage_size_limit == -1)
5302 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5303 "message_size_limit: %s", expand_string_message);
5305 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5306 "message_size_limit: %s", expand_string_message);
5310 /* Loop for several messages when reading SMTP input. If we fork any child
5311 processes, we don't want to wait for them unless synchronous delivery is
5312 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5313 same as SIG_DFL, despite the fact that documentation often lists the default as
5314 "ignore". This is a confusing area. This is what I know:
5316 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5317 processes that complete simply to go away without ever becoming defunct. You
5318 can't then wait for them - but we don't want to wait for them in the
5319 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5320 happen for all OS (e.g. *BSD is different).
5322 But that's not the end of the story. Some (many? all?) systems have the
5323 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5324 has by default, so it seems that the difference is merely one of default
5325 (compare restarting vs non-restarting signals).
5327 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5328 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5329 of the loop below. Paranoia rules.
5331 February 2003: That's *still* not the end of the story. There are now versions
5332 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5333 process then calls waitpid(), a grumble is written to the system log, because
5334 this is logically inconsistent. In other words, it doesn't like the paranoia.
5335 As a consequenc of this, the waitpid() below is now excluded if we are sure
5336 that SIG_IGN works. */
5338 if (!synchronous_delivery)
5341 struct sigaction act;
5342 act.sa_handler = SIG_IGN;
5343 sigemptyset(&(act.sa_mask));
5344 act.sa_flags = SA_NOCLDWAIT;
5345 sigaction(SIGCHLD, &act, NULL);
5347 signal(SIGCHLD, SIG_IGN);
5351 /* Save the current store pool point, for resetting at the start of
5352 each message, and save the real sender address, if any. */
5354 reset_point = store_get(0);
5355 real_sender_address = sender_address;
5357 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5358 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5363 store_reset(reset_point);
5366 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5367 input and build the recipients list, before calling receive_msg() to read the
5368 message proper. Whatever sender address is given in the SMTP transaction is
5369 often ignored for local senders - we use the actual sender, which is normally
5370 either the underlying user running this process or a -f argument provided by
5371 a trusted caller. It is saved in real_sender_address. The test for whether to
5372 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5377 if ((rc = smtp_setup_msg()) > 0)
5379 if (real_sender_address != NULL &&
5380 !receive_check_set_sender(sender_address))
5382 sender_address = raw_sender = real_sender_address;
5383 sender_address_unrewritten = NULL;
5386 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5387 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5388 the very end. The result of the ACL is ignored (as for other non-SMTP
5389 messages). It is run for its potential side effects. */
5391 if (smtp_batched_input && acl_not_smtp_start != NULL)
5393 uschar *user_msg, *log_msg;
5394 enable_dollar_recipients = TRUE;
5395 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5396 &user_msg, &log_msg);
5397 enable_dollar_recipients = FALSE;
5400 /* Now get the data for the message */
5402 more = receive_msg(extract_recipients);
5403 if (message_id[0] == 0)
5406 smtp_log_no_mail(); /* Log no mail if configured */
5407 exim_exit(EXIT_FAILURE);
5412 smtp_log_no_mail(); /* Log no mail if configured */
5413 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5417 /* In the non-SMTP case, we have all the information from the command
5418 line, but must process it in case it is in the more general RFC822
5419 format, and in any case, to detect syntax errors. Also, it appears that
5420 the use of comma-separated lists as single arguments is common, so we
5421 had better support them. */
5427 int count = argc - recipients_arg;
5428 uschar **list = argv + recipients_arg;
5430 /* These options cannot be changed dynamically for non-SMTP messages */
5432 active_local_sender_retain = local_sender_retain;
5433 active_local_from_check = local_from_check;
5435 /* Save before any rewriting */
5437 raw_sender = string_copy(sender_address);
5439 /* Loop for each argument */
5441 for (i = 0; i < count; i++)
5443 int start, end, domain;
5445 uschar *s = list[i];
5447 /* Loop for each comma-separated address */
5451 BOOL finished = FALSE;
5453 uschar *ss = parse_find_address_end(s, FALSE);
5455 if (*ss == ',') *ss = 0; else finished = TRUE;
5457 /* Check max recipients - if -t was used, these aren't recipients */
5459 if (recipients_max > 0 && ++rcount > recipients_max &&
5460 !extract_recipients)
5461 if (error_handling == ERRORS_STDERR)
5463 fprintf(stderr, "exim: too many recipients\n");
5464 exim_exit(EXIT_FAILURE);
5469 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5470 errors_sender_rc : EXIT_FAILURE;
5475 BOOL b = allow_utf8_domains;
5476 allow_utf8_domains = TRUE;
5479 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5482 if (string_is_utf8(recipient))
5483 message_smtputf8 = TRUE;
5485 allow_utf8_domains = b;
5488 if (domain == 0 && !allow_unqualified_recipient)
5491 errmess = US"unqualified recipient address not allowed";
5494 if (recipient == NULL)
5496 if (error_handling == ERRORS_STDERR)
5498 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5499 string_printing(list[i]), errmess);
5500 exim_exit(EXIT_FAILURE);
5506 eblock.text1 = string_printing(list[i]);
5507 eblock.text2 = errmess;
5509 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5510 errors_sender_rc : EXIT_FAILURE;
5514 receive_add_recipient(recipient, -1);
5517 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5521 /* Show the recipients when debugging */
5526 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5527 if (recipients_list != NULL)
5529 debug_printf("Recipients:\n");
5530 for (i = 0; i < recipients_count; i++)
5531 debug_printf(" %s\n", recipients_list[i].address);
5535 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5536 ignored; rejecting here would just add complication, and it can just as
5537 well be done later. Allow $recipients to be visible in the ACL. */
5539 if (acl_not_smtp_start != NULL)
5541 uschar *user_msg, *log_msg;
5542 enable_dollar_recipients = TRUE;
5543 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5544 &user_msg, &log_msg);
5545 enable_dollar_recipients = FALSE;
5548 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5549 will just read the headers for the message, and not write anything onto the
5552 message_ended = END_NOTENDED;
5553 more = receive_msg(extract_recipients);
5555 /* more is always FALSE here (not SMTP message) when reading a message
5556 for real; when reading the headers of a message for filter testing,
5557 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5559 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5560 } /* Non-SMTP message reception */
5562 /* If this is a filter testing run, there are headers in store, but
5563 no message on the spool. Run the filtering code in testing mode, setting
5564 the domain to the qualify domain and the local part to the current user,
5565 unless they have been set by options. The prefix and suffix are left unset
5566 unless specified. The the return path is set to to the sender unless it has
5567 already been set from a return-path header in the message. */
5569 if (filter_test != FTEST_NONE)
5571 deliver_domain = (ftest_domain != NULL)?
5572 ftest_domain : qualify_domain_recipient;
5573 deliver_domain_orig = deliver_domain;
5574 deliver_localpart = (ftest_localpart != NULL)?
5575 ftest_localpart : originator_login;
5576 deliver_localpart_orig = deliver_localpart;
5577 deliver_localpart_prefix = ftest_prefix;
5578 deliver_localpart_suffix = ftest_suffix;
5579 deliver_home = originator_home;
5581 if (return_path == NULL)
5583 printf("Return-path copied from sender\n");
5584 return_path = string_copy(sender_address);
5587 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5588 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5590 receive_add_recipient(
5591 string_sprintf("%s%s%s@%s",
5592 (ftest_prefix == NULL)? US"" : ftest_prefix,
5594 (ftest_suffix == NULL)? US"" : ftest_suffix,
5595 deliver_domain), -1);
5597 printf("Recipient = %s\n", recipients_list[0].address);
5598 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5599 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5601 if (chdir("/")) /* Get away from wherever the user is running this from */
5603 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5604 exim_exit(EXIT_FAILURE);
5607 /* Now we run either a system filter test, or a user filter test, or both.
5608 In the latter case, headers added by the system filter will persist and be
5609 available to the user filter. We need to copy the filter variables
5612 if ((filter_test & FTEST_SYSTEM) != 0)
5614 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5615 exim_exit(EXIT_FAILURE);
5618 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5620 if ((filter_test & FTEST_USER) != 0)
5622 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5623 exim_exit(EXIT_FAILURE);
5626 exim_exit(EXIT_SUCCESS);
5629 /* Else act on the result of message reception. We should not get here unless
5630 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5631 will be TRUE. If it is not, check on the number of messages received in this
5634 if (!session_local_queue_only &&
5635 smtp_accept_queue_per_connection > 0 &&
5636 receive_messagecount > smtp_accept_queue_per_connection)
5638 session_local_queue_only = TRUE;
5639 queue_only_reason = 2;
5642 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5643 and queue_only_load is set, check that the load average is below it. If it is
5644 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5645 default), we put the whole session into queue_only mode. It then remains this
5646 way for any subsequent messages on the same SMTP connection. This is a
5647 deliberate choice; even though the load average may fall, it doesn't seem
5648 right to deliver later messages on the same call when not delivering earlier
5649 ones. However, there are odd cases where this is not wanted, so this can be
5650 changed by setting queue_only_load_latch false. */
5652 local_queue_only = session_local_queue_only;
5653 if (!local_queue_only && queue_only_load >= 0)
5655 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5656 if (local_queue_only)
5658 queue_only_reason = 3;
5659 if (queue_only_load_latch) session_local_queue_only = TRUE;
5663 /* If running as an MUA wrapper, all queueing options and freezing options
5667 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5669 /* Log the queueing here, when it will get a message id attached, but
5670 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5673 if (local_queue_only) switch(queue_only_reason)
5676 log_write(L_delay_delivery,
5677 LOG_MAIN, "no immediate delivery: more than %d messages "
5678 "received in one connection", smtp_accept_queue_per_connection);
5682 log_write(L_delay_delivery,
5683 LOG_MAIN, "no immediate delivery: load average %.2f",
5684 (double)load_average/1000.0);
5688 /* Else do the delivery unless the ACL or local_scan() called for queue only
5689 or froze the message. Always deliver in a separate process. A fork failure is
5690 not a disaster, as the delivery will eventually happen on a subsequent queue
5691 run. The search cache must be tidied before the fork, as the parent will
5692 do it before exiting. The child will trigger a lookup failure and
5693 thereby defer the delivery if it tries to use (for example) a cached ldap
5694 connection that the parent has called unbind on. */
5696 else if (!queue_only_policy && !deliver_freeze)
5701 if ((pid = fork()) == 0)
5704 close_unwanted(); /* Close unwanted file descriptors and TLS */
5705 exim_nullstd(); /* Ensure std{in,out,err} exist */
5707 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5708 mode, deliver_drop_privilege is forced TRUE). */
5710 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5712 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5713 2, US"-Mc", message_id);
5714 /* Control does not return here. */
5717 /* No need to re-exec */
5719 rc = deliver_message(message_id, FALSE, FALSE);
5721 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5722 EXIT_SUCCESS : EXIT_FAILURE);
5727 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5728 "process: %s", strerror(errno));
5731 /* In the parent, wait if synchronous delivery is required. This will
5732 always be the case in MUA wrapper mode. */
5734 else if (synchronous_delivery)
5737 while (wait(&status) != pid);
5738 if ((status & 0x00ff) != 0)
5739 log_write(0, LOG_MAIN|LOG_PANIC,
5740 "process %d crashed with signal %d while delivering %s",
5741 (int)pid, status & 0x00ff, message_id);
5742 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5746 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5747 automatically reaps children (see comments above the loop), clear away any
5748 finished subprocesses here, in case there are lots of messages coming in
5749 from the same source. */
5751 #ifndef SIG_IGN_WORKS
5752 while (waitpid(-1, NULL, WNOHANG) > 0);
5756 exim_exit(EXIT_SUCCESS); /* Never returns */
5757 return 0; /* To stop compiler warning */