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: opt_D_used - true if the commandline had a "-D" option
1351 Returns: true if trusted, false otherwise
1355 macros_trusted(BOOL opt_D_used)
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 commandline macros should be very short.
1423 Accept the N*M complexity. */
1424 for (m = macros; m; m = m->next) if (m->command_line)
1427 for (w = whites; *w; ++w)
1428 if (Ustrcmp(*w, m->name) == 0)
1435 if (m->replacement == NULL)
1437 len = Ustrlen(m->replacement);
1440 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1441 0, PCRE_EOPT, NULL, 0);
1444 if (n != PCRE_ERROR_NOMATCH)
1445 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1449 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1455 /*************************************************
1456 * Entry point and high-level code *
1457 *************************************************/
1459 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1460 the appropriate action. All the necessary functions are present in the one
1461 binary. I originally thought one should split it up, but it turns out that so
1462 much of the apparatus is needed in each chunk that one might as well just have
1463 it all available all the time, which then makes the coding easier as well.
1466 argc count of entries in argv
1467 argv argument strings, with argv[0] being the program name
1469 Returns: EXIT_SUCCESS if terminated successfully
1470 EXIT_FAILURE otherwise, except when a message has been sent
1471 to the sender, and -oee was given
1475 main(int argc, char **cargv)
1477 uschar **argv = USS cargv;
1478 int arg_receive_timeout = -1;
1479 int arg_smtp_receive_timeout = -1;
1480 int arg_error_handling = error_handling;
1481 int filter_sfd = -1;
1482 int filter_ufd = -1;
1485 int list_queue_option = 0;
1487 int msg_action_arg = -1;
1488 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1489 int queue_only_reason = 0;
1491 int perl_start_option = 0;
1493 int recipients_arg = argc;
1494 int sender_address_domain = 0;
1495 int test_retry_arg = -1;
1496 int test_rewrite_arg = -1;
1497 BOOL arg_queue_only = FALSE;
1498 BOOL bi_option = FALSE;
1499 BOOL checking = FALSE;
1500 BOOL count_queue = FALSE;
1501 BOOL expansion_test = FALSE;
1502 BOOL extract_recipients = FALSE;
1503 BOOL flag_G = FALSE;
1504 BOOL flag_n = FALSE;
1505 BOOL forced_delivery = FALSE;
1506 BOOL f_end_dot = FALSE;
1507 BOOL deliver_give_up = FALSE;
1508 BOOL list_queue = FALSE;
1509 BOOL list_options = FALSE;
1510 BOOL list_config = FALSE;
1511 BOOL local_queue_only;
1513 BOOL one_msg_action = FALSE;
1514 BOOL opt_D_used = FALSE;
1515 BOOL queue_only_set = FALSE;
1516 BOOL receiving_message = TRUE;
1517 BOOL sender_ident_set = FALSE;
1518 BOOL session_local_queue_only;
1520 BOOL removed_privilege = FALSE;
1521 BOOL usage_wanted = FALSE;
1522 BOOL verify_address_mode = FALSE;
1523 BOOL verify_as_sender = FALSE;
1524 BOOL version_printed = FALSE;
1525 uschar *alias_arg = NULL;
1526 uschar *called_as = US"";
1527 uschar *cmdline_syslog_name = NULL;
1528 uschar *start_queue_run_id = NULL;
1529 uschar *stop_queue_run_id = NULL;
1530 uschar *expansion_test_message = NULL;
1531 uschar *ftest_domain = NULL;
1532 uschar *ftest_localpart = NULL;
1533 uschar *ftest_prefix = NULL;
1534 uschar *ftest_suffix = NULL;
1535 uschar *log_oneline = NULL;
1536 uschar *malware_test_file = NULL;
1537 uschar *real_sender_address;
1538 uschar *originator_home = US"/";
1543 struct stat statbuf;
1544 pid_t passed_qr_pid = (pid_t)0;
1545 int passed_qr_pipe = -1;
1546 gid_t group_list[NGROUPS_MAX];
1548 /* For the -bI: flag */
1549 enum commandline_info info_flag = CMDINFO_NONE;
1550 BOOL info_stdout = FALSE;
1552 /* Possible options for -R and -S */
1554 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1556 /* Need to define this in case we need to change the environment in order
1557 to get rid of a bogus time zone. We have to make it char rather than uschar
1558 because some OS define it in /usr/include/unistd.h. */
1560 extern char **environ;
1562 /* If the Exim user and/or group and/or the configuration file owner/group were
1563 defined by ref:name at build time, we must now find the actual uid/gid values.
1564 This is a feature to make the lives of binary distributors easier. */
1566 #ifdef EXIM_USERNAME
1567 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1571 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1575 /* If ref:name uses a number as the name, route_finduser() returns
1576 TRUE with exim_uid set and pw coerced to NULL. */
1578 exim_gid = pw->pw_gid;
1579 #ifndef EXIM_GROUPNAME
1583 "exim: ref:name should specify a usercode, not a group.\n"
1584 "exim: can't let you get away with it unless you also specify a group.\n");
1591 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1597 #ifdef EXIM_GROUPNAME
1598 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1600 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1606 #ifdef CONFIGURE_OWNERNAME
1607 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1609 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1610 CONFIGURE_OWNERNAME);
1615 /* We default the system_filter_user to be the Exim run-time user, as a
1616 sane non-root value. */
1617 system_filter_uid = exim_uid;
1619 #ifdef CONFIGURE_GROUPNAME
1620 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1622 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1623 CONFIGURE_GROUPNAME);
1628 /* In the Cygwin environment, some initialization used to need doing.
1629 It was fudged in by means of this macro; now no longer but we'll leave
1630 it in case of others. */
1636 /* Check a field which is patched when we are running Exim within its
1637 testing harness; do a fast initial check, and then the whole thing. */
1639 running_in_test_harness =
1640 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1642 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1643 at the start of a program; however, it seems that some environments do not
1644 follow this. A "strange" locale can affect the formatting of timestamps, so we
1647 setlocale(LC_ALL, "C");
1649 /* Set up the default handler for timing using alarm(). */
1651 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1653 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1654 because store_malloc writes a log entry on failure. */
1656 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1658 fprintf(stderr, "exim: failed to get store for log buffer\n");
1662 /* Initialize the default log options. */
1664 bits_set(log_selector, log_selector_size, log_default);
1666 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1667 NULL when the daemon is run and the file is closed. We have to use this
1668 indirection, because some systems don't allow writing to the variable "stderr".
1671 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1673 /* Arrange for the PCRE regex library to use our store functions. Note that
1674 the normal calls are actually macros that add additional arguments for
1675 debugging purposes so we have to assign specially constructed functions here.
1676 The default is to use store in the stacking pool, but this is overridden in the
1677 regex_must_compile() function. */
1679 pcre_malloc = function_store_get;
1680 pcre_free = function_dummy_free;
1682 /* Ensure there is a big buffer for temporary use in several places. It is put
1683 in malloc store so that it can be freed for enlargement if necessary. */
1685 big_buffer = store_malloc(big_buffer_size);
1687 /* Set up the handler for the data request signal, and set the initial
1688 descriptive text. */
1690 set_process_info("initializing");
1691 os_restarting_signal(SIGUSR1, usr1_handler);
1693 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1694 in the daemon code. For the rest of Exim's uses, we ignore it. */
1696 signal(SIGHUP, SIG_IGN);
1698 /* We don't want to die on pipe errors as the code is written to handle
1699 the write error instead. */
1701 signal(SIGPIPE, SIG_IGN);
1703 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1704 set to SIG_IGN. This causes subprocesses that complete before the parent
1705 process waits for them not to hang around, so when Exim calls wait(), nothing
1706 is there. The wait() code has been made robust against this, but let's ensure
1707 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1708 ending status. We use sigaction rather than plain signal() on those OS where
1709 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1710 problem on AIX with this.) */
1714 struct sigaction act;
1715 act.sa_handler = SIG_DFL;
1716 sigemptyset(&(act.sa_mask));
1718 sigaction(SIGCHLD, &act, NULL);
1721 signal(SIGCHLD, SIG_DFL);
1724 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1729 /* Set up the version number. Set up the leading 'E' for the external form of
1730 message ids, set the pointer to the internal form, and initialize it to
1731 indicate no message being processed. */
1734 message_id_option[0] = '-';
1735 message_id_external = message_id_option + 1;
1736 message_id_external[0] = 'E';
1737 message_id = message_id_external + 1;
1740 /* Set the umask to zero so that any files Exim creates using open() are
1741 created with the modes that it specifies. NOTE: Files created with fopen() have
1742 a problem, which was not recognized till rather late (February 2006). With this
1743 umask, such files will be world writeable. (They are all content scanning files
1744 in the spool directory, which isn't world-accessible, so this is not a
1745 disaster, but it's untidy.) I don't want to change this overall setting,
1746 however, because it will interact badly with the open() calls. Instead, there's
1747 now a function called modefopen() that fiddles with the umask while calling
1752 /* Precompile the regular expression for matching a message id. Keep this in
1753 step with the code that generates ids in the accept.c module. We need to do
1754 this here, because the -M options check their arguments for syntactic validity
1755 using mac_ismsgid, which uses this. */
1758 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1760 /* Precompile the regular expression that is used for matching an SMTP error
1761 code, possibly extended, at the start of an error message. Note that the
1762 terminating whitespace character is included. */
1765 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1768 #ifdef WHITELIST_D_MACROS
1769 /* Precompile the regular expression used to filter the content of macros
1770 given to -D for permissibility. */
1772 regex_whitelisted_macro =
1773 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1776 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1778 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1779 this seems to be a generally accepted convention, since one finds symbolic
1780 links called "mailq" in standard OS configurations. */
1782 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1783 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1786 receiving_message = FALSE;
1787 called_as = US"-mailq";
1790 /* If the program is called as "rmail" treat it as equivalent to
1791 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1792 i.e. preventing a single dot on a line from terminating the message, and
1793 returning with zero return code, even in cases of error (provided an error
1794 message has been sent). */
1796 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1797 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1800 called_as = US"-rmail";
1801 errors_sender_rc = EXIT_SUCCESS;
1804 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1805 this is a smail convention. */
1807 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1808 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1810 smtp_input = smtp_batched_input = TRUE;
1811 called_as = US"-rsmtp";
1814 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1815 this is a smail convention. */
1817 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1818 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1821 receiving_message = FALSE;
1822 called_as = US"-runq";
1825 /* If the program is called as "newaliases" treat it as equivalent to
1826 "exim -bi"; this is a sendmail convention. */
1828 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1829 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1832 receiving_message = FALSE;
1833 called_as = US"-newaliases";
1836 /* Save the original effective uid for a couple of uses later. It should
1837 normally be root, but in some esoteric environments it may not be. */
1839 original_euid = geteuid();
1841 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1842 to be the same as the real ones. This makes a difference only if Exim is setuid
1843 (or setgid) to something other than root, which could be the case in some
1844 special configurations. */
1846 real_uid = getuid();
1847 real_gid = getgid();
1849 if (real_uid == root_uid)
1851 rv = setgid(real_gid);
1854 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1855 (long int)real_gid, strerror(errno));
1858 rv = setuid(real_uid);
1861 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1862 (long int)real_uid, strerror(errno));
1867 /* If neither the original real uid nor the original euid was root, Exim is
1868 running in an unprivileged state. */
1870 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1872 /* Scan the program's arguments. Some can be dealt with right away; others are
1873 simply recorded for checking and handling afterwards. Do a high-level switch
1874 on the second character (the one after '-'), to save some effort. */
1876 for (i = 1; i < argc; i++)
1878 BOOL badarg = FALSE;
1879 uschar *arg = argv[i];
1883 /* An argument not starting with '-' is the start of a recipients list;
1884 break out of the options-scanning loop. */
1892 /* An option consistion of -- terminates the options */
1894 if (Ustrcmp(arg, "--") == 0)
1896 recipients_arg = i + 1;
1900 /* Handle flagged options */
1902 switchchar = arg[1];
1905 /* Make all -ex options synonymous with -oex arguments, since that
1906 is assumed by various callers. Also make -qR options synonymous with -R
1907 options, as that seems to be required as well. Allow for -qqR too, and
1908 the same for -S options. */
1910 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1911 Ustrncmp(arg+1, "qR", 2) == 0 ||
1912 Ustrncmp(arg+1, "qS", 2) == 0)
1914 switchchar = arg[2];
1917 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1919 switchchar = arg[3];
1921 queue_2stage = TRUE;
1924 /* Make -r synonymous with -f, since it is a documented alias */
1926 else if (arg[1] == 'r') switchchar = 'f';
1928 /* Make -ov synonymous with -v */
1930 else if (Ustrcmp(arg, "-ov") == 0)
1936 /* deal with --option_aliases */
1937 else if (switchchar == '-')
1939 if (Ustrcmp(argrest, "help") == 0)
1941 usage_wanted = TRUE;
1944 else if (Ustrcmp(argrest, "version") == 0)
1951 /* High-level switch on active initial letter */
1956 /* sendmail uses -Ac and -Am to control which .cf file is used;
1959 if (*argrest == '\0') { badarg = TRUE; break; }
1962 BOOL ignore = FALSE;
1967 if (*(argrest + 1) == '\0')
1971 if (!ignore) { badarg = TRUE; break; }
1975 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1976 so has no need of it. */
1979 if (*argrest == 0) i++; /* Skip over the type */
1984 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1986 /* -bd: Run in daemon mode, awaiting SMTP connections.
1987 -bdf: Ditto, but in the foreground.
1990 if (*argrest == 'd')
1992 daemon_listen = TRUE;
1993 if (*(++argrest) == 'f') background_daemon = FALSE;
1994 else if (*argrest != 0) { badarg = TRUE; break; }
1997 /* -be: Run in expansion test mode
1998 -bem: Ditto, but read a message from a file first
2001 else if (*argrest == 'e')
2003 expansion_test = checking = TRUE;
2004 if (argrest[1] == 'm')
2006 if (++i >= argc) { badarg = TRUE; break; }
2007 expansion_test_message = argv[i];
2010 if (argrest[1] != 0) { badarg = TRUE; break; }
2013 /* -bF: Run system filter test */
2015 else if (*argrest == 'F')
2017 filter_test |= checking = FTEST_SYSTEM;
2018 if (*(++argrest) != 0) { badarg = TRUE; break; }
2019 if (++i < argc) filter_test_sfile = argv[i]; else
2021 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2026 /* -bf: Run user filter test
2027 -bfd: Set domain for filter testing
2028 -bfl: Set local part for filter testing
2029 -bfp: Set prefix for filter testing
2030 -bfs: Set suffix for filter testing
2033 else if (*argrest == 'f')
2035 if (*(++argrest) == 0)
2037 filter_test |= checking = FTEST_USER;
2038 if (++i < argc) filter_test_ufile = argv[i]; else
2040 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2048 fprintf(stderr, "exim: string expected after %s\n", arg);
2051 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2052 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2053 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2054 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2055 else { badarg = TRUE; break; }
2059 /* -bh: Host checking - an IP address must follow. */
2061 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2063 if (++i >= argc) { badarg = TRUE; break; }
2064 sender_host_address = argv[i];
2065 host_checking = checking = log_testing_mode = TRUE;
2066 host_checking_callout = argrest[1] == 'c';
2067 message_logs = FALSE;
2070 /* -bi: This option is used by sendmail to initialize *the* alias file,
2071 though it has the -oA option to specify a different file. Exim has no
2072 concept of *the* alias file, but since Sun's YP make script calls
2073 sendmail this way, some support must be provided. */
2075 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2077 /* -bI: provide information, of the type to follow after a colon.
2078 This is an Exim flag. */
2080 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2082 uschar *p = &argrest[2];
2083 info_flag = CMDINFO_HELP;
2086 if (strcmpic(p, CUS"sieve") == 0)
2088 info_flag = CMDINFO_SIEVE;
2091 else if (strcmpic(p, CUS"dscp") == 0)
2093 info_flag = CMDINFO_DSCP;
2096 else if (strcmpic(p, CUS"help") == 0)
2103 /* -bm: Accept and deliver message - the default option. Reinstate
2104 receiving_message, which got turned off for all -b options. */
2106 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2108 /* -bmalware: test the filename given for malware */
2110 else if (Ustrcmp(argrest, "malware") == 0)
2112 if (++i >= argc) { badarg = TRUE; break; }
2114 malware_test_file = argv[i];
2117 /* -bnq: For locally originating messages, do not qualify unqualified
2118 addresses. In the envelope, this causes errors; in header lines they
2121 else if (Ustrcmp(argrest, "nq") == 0)
2123 allow_unqualified_sender = FALSE;
2124 allow_unqualified_recipient = FALSE;
2127 /* -bpxx: List the contents of the mail queue, in various forms. If
2128 the option is -bpc, just a queue count is needed. Otherwise, if the
2129 first letter after p is r, then order is random. */
2131 else if (*argrest == 'p')
2133 if (*(++argrest) == 'c')
2136 if (*(++argrest) != 0) badarg = TRUE;
2140 if (*argrest == 'r')
2142 list_queue_option = 8;
2145 else list_queue_option = 0;
2149 /* -bp: List the contents of the mail queue, top-level only */
2151 if (*argrest == 0) {}
2153 /* -bpu: List the contents of the mail queue, top-level undelivered */
2155 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2157 /* -bpa: List the contents of the mail queue, including all delivered */
2159 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2161 /* Unknown after -bp[r] */
2171 /* -bP: List the configuration variables given as the address list.
2172 Force -v, so configuration errors get displayed. */
2174 else if (Ustrcmp(argrest, "P") == 0)
2176 /* -bP config: we need to setup here, because later,
2177 * when list_options is checked, the config is read already */
2178 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2181 readconf_save_config(version_string);
2185 list_options = TRUE;
2186 debug_selector |= D_v;
2187 debug_file = stderr;
2191 /* -brt: Test retry configuration lookup */
2193 else if (Ustrcmp(argrest, "rt") == 0)
2196 test_retry_arg = i + 1;
2200 /* -brw: Test rewrite configuration */
2202 else if (Ustrcmp(argrest, "rw") == 0)
2205 test_rewrite_arg = i + 1;
2209 /* -bS: Read SMTP commands on standard input, but produce no replies -
2210 all errors are reported by sending messages. */
2212 else if (Ustrcmp(argrest, "S") == 0)
2213 smtp_input = smtp_batched_input = receiving_message = TRUE;
2215 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2216 on standard output. */
2218 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2220 /* -bt: address testing mode */
2222 else if (Ustrcmp(argrest, "t") == 0)
2223 address_test_mode = checking = log_testing_mode = TRUE;
2225 /* -bv: verify addresses */
2227 else if (Ustrcmp(argrest, "v") == 0)
2228 verify_address_mode = checking = log_testing_mode = TRUE;
2230 /* -bvs: verify sender addresses */
2232 else if (Ustrcmp(argrest, "vs") == 0)
2234 verify_address_mode = checking = log_testing_mode = TRUE;
2235 verify_as_sender = TRUE;
2238 /* -bV: Print version string and support details */
2240 else if (Ustrcmp(argrest, "V") == 0)
2242 printf("Exim version %s #%s built %s\n", version_string,
2243 version_cnumber, version_date);
2244 printf("%s\n", CS version_copyright);
2245 version_printed = TRUE;
2246 show_whats_supported(stdout);
2247 log_testing_mode = TRUE;
2250 /* -bw: inetd wait mode, accept a listening socket as stdin */
2252 else if (*argrest == 'w')
2254 inetd_wait_mode = TRUE;
2255 background_daemon = FALSE;
2256 daemon_listen = TRUE;
2257 if (*(++argrest) != '\0')
2259 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2260 if (inetd_wait_timeout <= 0)
2262 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2272 /* -C: change configuration file list; ignore if it isn't really
2273 a change! Enforce a prefix check if required. */
2278 if(++i < argc) argrest = argv[i]; else
2279 { badarg = TRUE; break; }
2281 if (Ustrcmp(config_main_filelist, argrest) != 0)
2283 #ifdef ALT_CONFIG_PREFIX
2285 int len = Ustrlen(ALT_CONFIG_PREFIX);
2286 uschar *list = argrest;
2288 while((filename = string_nextinlist(&list, &sep, big_buffer,
2289 big_buffer_size)) != NULL)
2291 if ((Ustrlen(filename) < len ||
2292 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2293 Ustrstr(filename, "/../") != NULL) &&
2294 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2296 fprintf(stderr, "-C Permission denied\n");
2301 if (real_uid != root_uid)
2303 #ifdef TRUSTED_CONFIG_LIST
2305 if (real_uid != exim_uid
2306 #ifdef CONFIGURE_OWNER
2307 && real_uid != config_uid
2310 trusted_config = FALSE;
2313 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2316 struct stat statbuf;
2318 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2319 (statbuf.st_uid != root_uid /* owner not root */
2320 #ifdef CONFIGURE_OWNER
2321 && statbuf.st_uid != config_uid /* owner not the special one */
2324 (statbuf.st_gid != root_gid /* group not root */
2325 #ifdef CONFIGURE_GROUP
2326 && statbuf.st_gid != config_gid /* group not the special one */
2328 && (statbuf.st_mode & 020) != 0 /* group writeable */
2330 (statbuf.st_mode & 2) != 0) /* world writeable */
2332 trusted_config = FALSE;
2337 /* Well, the trust list at least is up to scratch... */
2338 void *reset_point = store_get(0);
2339 uschar *trusted_configs[32];
2343 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2345 uschar *start = big_buffer, *nl;
2346 while (*start && isspace(*start))
2350 nl = Ustrchr(start, '\n');
2353 trusted_configs[nr_configs++] = string_copy(start);
2354 if (nr_configs == 32)
2362 const uschar *list = argrest;
2364 while (trusted_config && (filename = string_nextinlist(&list,
2365 &sep, big_buffer, big_buffer_size)) != NULL)
2367 for (i=0; i < nr_configs; i++)
2369 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2372 if (i == nr_configs)
2374 trusted_config = FALSE;
2378 store_reset(reset_point);
2382 /* No valid prefixes found in trust_list file. */
2383 trusted_config = FALSE;
2389 /* Could not open trust_list file. */
2390 trusted_config = FALSE;
2394 /* Not root; don't trust config */
2395 trusted_config = FALSE;
2399 config_main_filelist = argrest;
2400 config_changed = TRUE;
2405 /* -D: set up a macro definition */
2408 #ifdef DISABLE_D_OPTION
2409 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2416 uschar *s = argrest;
2419 while (isspace(*s)) s++;
2421 if (*s < 'A' || *s > 'Z')
2423 fprintf(stderr, "exim: macro name set by -D must start with "
2424 "an upper case letter\n");
2428 while (isalnum(*s) || *s == '_')
2430 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2434 if (ptr == 0) { badarg = TRUE; break; }
2435 while (isspace(*s)) s++;
2438 if (*s++ != '=') { badarg = TRUE; break; }
2439 while (isspace(*s)) s++;
2442 for (m = macros; m; m = m->next)
2443 if (Ustrcmp(m->name, name) == 0)
2445 fprintf(stderr, "exim: duplicated -D in command line\n");
2449 m = macro_create(name, s, TRUE, FALSE);
2451 if (clmacro_count >= MAX_CLMACROS)
2453 fprintf(stderr, "exim: too many -D options on command line\n");
2456 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2462 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2463 The latter is now a no-op, retained for compatibility only. If -dd is used,
2464 debugging subprocesses of the daemon is disabled. */
2467 if (Ustrcmp(argrest, "ropcr") == 0)
2469 /* drop_cr = TRUE; */
2472 /* Use an intermediate variable so that we don't set debugging while
2473 decoding the debugging bits. */
2477 unsigned int selector = D_default;
2480 if (*argrest == 'd')
2482 debug_daemon = TRUE;
2486 decode_bits(&selector, 1, debug_notall, argrest,
2487 debug_options, debug_options_count, US"debug", 0);
2488 debug_selector = selector;
2493 /* -E: This is a local error message. This option is not intended for
2494 external use at all, but is not restricted to trusted callers because it
2495 does no harm (just suppresses certain error messages) and if Exim is run
2496 not setuid root it won't always be trusted when it generates error
2497 messages using this option. If there is a message id following -E, point
2498 message_reference at it, for logging. */
2501 local_error_message = TRUE;
2502 if (mac_ismsgid(argrest)) message_reference = argrest;
2506 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2507 option, so it looks as if historically the -oex options are also callable
2508 without the leading -o. So we have to accept them. Before the switch,
2509 anything starting -oe has been converted to -e. Exim does not support all
2510 of the sendmail error options. */
2513 if (Ustrcmp(argrest, "e") == 0)
2515 arg_error_handling = ERRORS_SENDER;
2516 errors_sender_rc = EXIT_SUCCESS;
2518 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2519 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2520 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2521 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2526 /* -F: Set sender's full name, used instead of the gecos entry from
2527 the password file. Since users can usually alter their gecos entries,
2528 there's no security involved in using this instead. The data can follow
2529 the -F or be in the next argument. */
2534 if(++i < argc) argrest = argv[i]; else
2535 { badarg = TRUE; break; }
2537 originator_name = argrest;
2538 sender_name_forced = TRUE;
2542 /* -f: Set sender's address - this value is only actually used if Exim is
2543 run by a trusted user, or if untrusted_set_sender is set and matches the
2544 address, except that the null address can always be set by any user. The
2545 test for this happens later, when the value given here is ignored when not
2546 permitted. For an untrusted user, the actual sender is still put in Sender:
2547 if it doesn't match the From: header (unless no_local_from_check is set).
2548 The data can follow the -f or be in the next argument. The -r switch is an
2549 obsolete form of -f but since there appear to be programs out there that
2550 use anything that sendmail has ever supported, better accept it - the
2551 synonymizing is done before the switch above.
2553 At this stage, we must allow domain literal addresses, because we don't
2554 know what the setting of allow_domain_literals is yet. Ditto for trailing
2555 dots and strip_trailing_dot. */
2559 int dummy_start, dummy_end;
2563 if (i+1 < argc) argrest = argv[++i]; else
2564 { badarg = TRUE; break; }
2567 sender_address = string_sprintf(""); /* Ensure writeable memory */
2570 uschar *temp = argrest + Ustrlen(argrest) - 1;
2571 while (temp >= argrest && isspace(*temp)) temp--;
2572 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2573 allow_domain_literals = TRUE;
2574 strip_trailing_dot = TRUE;
2576 allow_utf8_domains = TRUE;
2578 sender_address = parse_extract_address(argrest, &errmess,
2579 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2581 message_smtputf8 = string_is_utf8(sender_address);
2582 allow_utf8_domains = FALSE;
2584 allow_domain_literals = FALSE;
2585 strip_trailing_dot = FALSE;
2586 if (sender_address == NULL)
2588 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2589 return EXIT_FAILURE;
2592 sender_address_forced = TRUE;
2596 /* -G: sendmail invocation to specify that it's a gateway submission and
2597 sendmail may complain about problems instead of fixing them.
2598 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2599 not at this time complain about problems. */
2605 /* -h: Set the hop count for an incoming message. Exim does not currently
2606 support this; it always computes it by counting the Received: headers.
2607 To put it in will require a change to the spool header file format. */
2612 if(++i < argc) argrest = argv[i]; else
2613 { badarg = TRUE; break; }
2615 if (!isdigit(*argrest)) badarg = TRUE;
2619 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2620 not to be documented for sendmail but mailx (at least) uses it) */
2623 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2627 /* -L: set the identifier used for syslog; equivalent to setting
2628 syslog_processname in the config file, but needs to be an admin option. */
2631 if (*argrest == '\0')
2633 if(++i < argc) argrest = argv[i]; else
2634 { badarg = TRUE; break; }
2636 sz = Ustrlen(argrest);
2639 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2640 return EXIT_FAILURE;
2644 fprintf(stderr, "exim: the -L syslog name is too short\n");
2645 return EXIT_FAILURE;
2647 cmdline_syslog_name = argrest;
2651 receiving_message = FALSE;
2653 /* -MC: continue delivery of another message via an existing open
2654 file descriptor. This option is used for an internal call by the
2655 smtp transport when there is a pending message waiting to go to an
2656 address to which it has got a connection. Five subsequent arguments are
2657 required: transport name, host name, IP address, sequence number, and
2658 message_id. Transports may decline to create new processes if the sequence
2659 number gets too big. The channel is stdin. This (-MC) must be the last
2660 argument. There's a subsequent check that the real-uid is privileged.
2662 If we are running in the test harness. delay for a bit, to let the process
2663 that set this one up complete. This makes for repeatability of the logging,
2666 if (Ustrcmp(argrest, "C") == 0)
2668 union sockaddr_46 interface_sock;
2669 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2673 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2674 return EXIT_FAILURE;
2677 if (msg_action_arg >= 0)
2679 fprintf(stderr, "exim: incompatible arguments\n");
2680 return EXIT_FAILURE;
2683 continue_transport = argv[++i];
2684 continue_hostname = argv[++i];
2685 continue_host_address = argv[++i];
2686 continue_sequence = Uatoi(argv[++i]);
2687 msg_action = MSG_DELIVER;
2688 msg_action_arg = ++i;
2689 forced_delivery = TRUE;
2690 queue_run_pid = passed_qr_pid;
2691 queue_run_pipe = passed_qr_pipe;
2693 if (!mac_ismsgid(argv[i]))
2695 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2697 return EXIT_FAILURE;
2700 /* Set up $sending_ip_address and $sending_port */
2702 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2704 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2708 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2710 return EXIT_FAILURE;
2713 if (running_in_test_harness) millisleep(500);
2717 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2721 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2722 precedes -MC (see above). The flag indicates that the host to which
2723 Exim is connected has accepted an AUTH sequence. */
2725 case 'A': smtp_authenticated = TRUE; break;
2727 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2728 that exim is connected to supports the esmtp extension DSN */
2730 case 'D': smtp_peer_options |= PEER_OFFERED_DSN; break;
2732 /* -MCG: set the queue name, to a non-default value */
2734 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2738 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2740 case 'K': smtp_peer_options |= PEER_OFFERED_CHUNKING; break;
2742 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2743 it preceded -MC (see above) */
2745 case 'P': smtp_peer_options |= PEER_OFFERED_PIPE; break;
2747 /* -MCQ: pass on the pid of the queue-running process that started
2748 this chain of deliveries and the fd of its synchronizing pipe; this
2749 is useful only when it precedes -MC (see above) */
2751 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2753 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2757 /* -MCS: set the smtp_use_size flag; this is useful only when it
2758 precedes -MC (see above) */
2760 case 'S': smtp_peer_options |= PEER_OFFERED_SIZE; break;
2763 /* -MCT: set the tls_offered flag; this is useful only when it
2764 precedes -MC (see above). The flag indicates that the host to which
2765 Exim is connected has offered TLS support. */
2767 case 'T': smtp_peer_options |= PEER_OFFERED_TLS; break;
2770 default: badarg = TRUE; break;
2775 /* -M[x]: various operations on the following list of message ids:
2776 -M deliver the messages, ignoring next retry times and thawing
2777 -Mc deliver the messages, checking next retry times, no thawing
2778 -Mf freeze the messages
2779 -Mg give up on the messages
2780 -Mt thaw the messages
2781 -Mrm remove the messages
2782 In the above cases, this must be the last option. There are also the
2783 following options which are followed by a single message id, and which
2784 act on that message. Some of them use the "recipient" addresses as well.
2785 -Mar add recipient(s)
2786 -Mmad mark all recipients delivered
2787 -Mmd mark recipients(s) delivered
2789 -Mset load a message for use with -be
2791 -Mvc show copy (of whole message, in RFC 2822 format)
2796 else if (*argrest == 0)
2798 msg_action = MSG_DELIVER;
2799 forced_delivery = deliver_force_thaw = TRUE;
2801 else if (Ustrcmp(argrest, "ar") == 0)
2803 msg_action = MSG_ADD_RECIPIENT;
2804 one_msg_action = TRUE;
2806 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2807 else if (Ustrcmp(argrest, "es") == 0)
2809 msg_action = MSG_EDIT_SENDER;
2810 one_msg_action = TRUE;
2812 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2813 else if (Ustrcmp(argrest, "g") == 0)
2815 msg_action = MSG_DELIVER;
2816 deliver_give_up = TRUE;
2818 else if (Ustrcmp(argrest, "mad") == 0)
2820 msg_action = MSG_MARK_ALL_DELIVERED;
2822 else if (Ustrcmp(argrest, "md") == 0)
2824 msg_action = MSG_MARK_DELIVERED;
2825 one_msg_action = TRUE;
2827 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2828 else if (Ustrcmp(argrest, "set") == 0)
2830 msg_action = MSG_LOAD;
2831 one_msg_action = TRUE;
2833 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2834 else if (Ustrcmp(argrest, "vb") == 0)
2836 msg_action = MSG_SHOW_BODY;
2837 one_msg_action = TRUE;
2839 else if (Ustrcmp(argrest, "vc") == 0)
2841 msg_action = MSG_SHOW_COPY;
2842 one_msg_action = TRUE;
2844 else if (Ustrcmp(argrest, "vh") == 0)
2846 msg_action = MSG_SHOW_HEADER;
2847 one_msg_action = TRUE;
2849 else if (Ustrcmp(argrest, "vl") == 0)
2851 msg_action = MSG_SHOW_LOG;
2852 one_msg_action = TRUE;
2854 else { badarg = TRUE; break; }
2856 /* All the -Mxx options require at least one message id. */
2858 msg_action_arg = i + 1;
2859 if (msg_action_arg >= argc)
2861 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2862 return EXIT_FAILURE;
2865 /* Some require only message ids to follow */
2867 if (!one_msg_action)
2870 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2872 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2874 return EXIT_FAILURE;
2876 goto END_ARG; /* Remaining args are ids */
2879 /* Others require only one message id, possibly followed by addresses,
2880 which will be handled as normal arguments. */
2884 if (!mac_ismsgid(argv[msg_action_arg]))
2886 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2887 argv[msg_action_arg], arg);
2888 return EXIT_FAILURE;
2895 /* Some programs seem to call the -om option without the leading o;
2896 for sendmail it askes for "me too". Exim always does this. */
2899 if (*argrest != 0) badarg = TRUE;
2903 /* -N: don't do delivery - a debugging option that stops transports doing
2904 their thing. It implies debugging at the D_v level. */
2909 dont_deliver = TRUE;
2910 debug_selector |= D_v;
2911 debug_file = stderr;
2917 /* -n: This means "don't alias" in sendmail, apparently.
2918 For normal invocations, it has no effect.
2919 It may affect some other options. */
2925 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2926 option to the specified value. This form uses long names. We need to handle
2927 -O option=value and -Ooption=value. */
2934 fprintf(stderr, "exim: string expected after -O\n");
2942 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2945 if (*argrest == 'A')
2947 alias_arg = argrest + 1;
2948 if (alias_arg[0] == 0)
2950 if (i+1 < argc) alias_arg = argv[++i]; else
2952 fprintf(stderr, "exim: string expected after -oA\n");
2958 /* -oB: Set a connection message max value for remote deliveries */
2960 else if (*argrest == 'B')
2962 uschar *p = argrest + 1;
2965 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2967 connection_max_messages = 1;
2976 fprintf(stderr, "exim: number expected after -oB\n");
2979 connection_max_messages = Uatoi(p);
2983 /* -odb: background delivery */
2985 else if (Ustrcmp(argrest, "db") == 0)
2987 synchronous_delivery = FALSE;
2988 arg_queue_only = FALSE;
2989 queue_only_set = TRUE;
2992 /* -odf: foreground delivery (smail-compatible option); same effect as
2993 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2996 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2998 synchronous_delivery = TRUE;
2999 arg_queue_only = FALSE;
3000 queue_only_set = TRUE;
3003 /* -odq: queue only */
3005 else if (Ustrcmp(argrest, "dq") == 0)
3007 synchronous_delivery = FALSE;
3008 arg_queue_only = TRUE;
3009 queue_only_set = TRUE;
3012 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3013 but no remote delivery */
3015 else if (Ustrcmp(argrest, "dqs") == 0)
3018 arg_queue_only = FALSE;
3019 queue_only_set = TRUE;
3022 /* -oex: Sendmail error flags. As these are also accepted without the
3023 leading -o prefix, for compatibility with vacation and other callers,
3024 they are handled with -e above. */
3026 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3027 -oitrue: Another sendmail syntax for the same */
3029 else if (Ustrcmp(argrest, "i") == 0 ||
3030 Ustrcmp(argrest, "itrue") == 0)
3033 /* -oM*: Set various characteristics for an incoming message; actually
3034 acted on for trusted callers only. */
3036 else if (*argrest == 'M')
3040 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3044 /* -oMa: Set sender host address */
3046 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3048 /* -oMaa: Set authenticator name */
3050 else if (Ustrcmp(argrest, "Maa") == 0)
3051 sender_host_authenticated = argv[++i];
3053 /* -oMas: setting authenticated sender */
3055 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3057 /* -oMai: setting authenticated id */
3059 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3061 /* -oMi: Set incoming interface address */
3063 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3065 /* -oMm: Message reference */
3067 else if (Ustrcmp(argrest, "Mm") == 0)
3069 if (!mac_ismsgid(argv[i+1]))
3071 fprintf(stderr,"-oMm must be a valid message ID\n");
3074 if (!trusted_config)
3076 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3079 message_reference = argv[++i];
3082 /* -oMr: Received protocol */
3084 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3086 /* -oMs: Set sender host name */
3088 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3090 /* -oMt: Set sender ident */
3092 else if (Ustrcmp(argrest, "Mt") == 0)
3094 sender_ident_set = TRUE;
3095 sender_ident = argv[++i];
3098 /* Else a bad argument */
3107 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3108 seem to call this as -m (undocumented), so that is also accepted (see
3111 else if (Ustrcmp(argrest, "m") == 0) {}
3113 /* -oo: An ancient flag for old-style addresses which still seems to
3114 crop up in some calls (see in SCO). */
3116 else if (Ustrcmp(argrest, "o") == 0) {}
3118 /* -oP <name>: set pid file path for daemon */
3120 else if (Ustrcmp(argrest, "P") == 0)
3121 override_pid_file_path = argv[++i];
3123 /* -or <n>: set timeout for non-SMTP acceptance
3124 -os <n>: set timeout for SMTP acceptance */
3126 else if (*argrest == 'r' || *argrest == 's')
3128 int *tp = (*argrest == 'r')?
3129 &arg_receive_timeout : &arg_smtp_receive_timeout;
3130 if (argrest[1] == 0)
3132 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3134 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3137 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3142 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3144 else if (Ustrcmp(argrest, "X") == 0)
3145 override_local_interfaces = argv[++i];
3147 /* Unknown -o argument */
3153 /* -ps: force Perl startup; -pd force delayed Perl startup */
3157 if (*argrest == 's' && argrest[1] == 0)
3159 perl_start_option = 1;
3162 if (*argrest == 'd' && argrest[1] == 0)
3164 perl_start_option = -1;
3169 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3170 which sets the host protocol and host name */
3174 if (i+1 < argc) argrest = argv[++i]; else
3175 { badarg = TRUE; break; }
3180 uschar *hn = Ustrchr(argrest, ':');
3183 received_protocol = argrest;
3187 received_protocol = string_copyn(argrest, hn - argrest);
3188 sender_host_name = hn + 1;
3195 receiving_message = FALSE;
3196 if (queue_interval >= 0)
3198 fprintf(stderr, "exim: -q specified more than once\n");
3202 /* -qq...: Do queue runs in a 2-stage manner */
3204 if (*argrest == 'q')
3206 queue_2stage = TRUE;
3210 /* -qi...: Do only first (initial) deliveries */
3212 if (*argrest == 'i')
3214 queue_run_first_delivery = TRUE;
3218 /* -qf...: Run the queue, forcing deliveries
3219 -qff..: Ditto, forcing thawing as well */
3221 if (*argrest == 'f')
3223 queue_run_force = TRUE;
3224 if (*++argrest == 'f')
3226 deliver_force_thaw = TRUE;
3231 /* -q[f][f]l...: Run the queue only on local deliveries */
3233 if (*argrest == 'l')
3235 queue_run_local = TRUE;
3239 /* -q[f][f][l][G<name>]... Work on the named queue */
3241 if (*argrest == 'G')
3244 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3245 queue_name = string_copyn(argrest, i);
3247 if (*argrest == '/') argrest++;
3250 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3251 only, optionally named, optionally starting from a given message id. */
3253 if (*argrest == 0 &&
3254 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3257 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3258 start_queue_run_id = argv[++i];
3259 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3260 stop_queue_run_id = argv[++i];
3263 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3264 forced, optionally local only, optionally named. */
3266 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3269 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3275 case 'R': /* Synonymous with -qR... */
3276 receiving_message = FALSE;
3278 /* -Rf: As -R (below) but force all deliveries,
3279 -Rff: Ditto, but also thaw all frozen messages,
3280 -Rr: String is regex
3281 -Rrf: Regex and force
3282 -Rrff: Regex and force and thaw
3284 in all cases provided there are no further characters in this
3290 for (i = 0; i < nelem(rsopts); i++)
3291 if (Ustrcmp(argrest, rsopts[i]) == 0)
3293 if (i != 2) queue_run_force = TRUE;
3294 if (i >= 2) deliver_selectstring_regex = TRUE;
3295 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3296 argrest += Ustrlen(rsopts[i]);
3300 /* -R: Set string to match in addresses for forced queue run to
3301 pick out particular messages. */
3304 deliver_selectstring = argrest;
3305 else if (i+1 < argc)
3306 deliver_selectstring = argv[++i];
3309 fprintf(stderr, "exim: string expected after -R\n");
3315 /* -r: an obsolete synonym for -f (see above) */
3318 /* -S: Like -R but works on sender. */
3320 case 'S': /* Synonymous with -qS... */
3321 receiving_message = FALSE;
3323 /* -Sf: As -S (below) but force all deliveries,
3324 -Sff: Ditto, but also thaw all frozen messages,
3325 -Sr: String is regex
3326 -Srf: Regex and force
3327 -Srff: Regex and force and thaw
3329 in all cases provided there are no further characters in this
3335 for (i = 0; i < nelem(rsopts); i++)
3336 if (Ustrcmp(argrest, rsopts[i]) == 0)
3338 if (i != 2) queue_run_force = TRUE;
3339 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3340 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3341 argrest += Ustrlen(rsopts[i]);
3345 /* -S: Set string to match in addresses for forced queue run to
3346 pick out particular messages. */
3349 deliver_selectstring_sender = argrest;
3350 else if (i+1 < argc)
3351 deliver_selectstring_sender = argv[++i];
3354 fprintf(stderr, "exim: string expected after -S\n");
3359 /* -Tqt is an option that is exclusively for use by the testing suite.
3360 It is not recognized in other circumstances. It allows for the setting up
3361 of explicit "queue times" so that various warning/retry things can be
3362 tested. Otherwise variability of clock ticks etc. cause problems. */
3365 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3366 fudged_queue_times = argv[++i];
3371 /* -t: Set flag to extract recipients from body of message. */
3374 if (*argrest == 0) extract_recipients = TRUE;
3376 /* -ti: Set flag to extract recipients from body of message, and also
3377 specify that dot does not end the message. */
3379 else if (Ustrcmp(argrest, "i") == 0)
3381 extract_recipients = TRUE;
3385 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3388 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3395 /* -U: This means "initial user submission" in sendmail, apparently. The
3396 doc claims that in future sendmail may refuse syntactically invalid
3397 messages instead of fixing them. For the moment, we just ignore it. */
3403 /* -v: verify things - this is a very low-level debugging */
3408 debug_selector |= D_v;
3409 debug_file = stderr;
3415 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3417 The -x flag tells the sendmail command that mail from a local
3418 mail program has National Language Support (NLS) extended characters
3419 in the body of the mail item. The sendmail command can send mail with
3420 extended NLS characters across networks that normally corrupts these
3423 As Exim is 8-bit clean, it just ignores this flag. */
3426 if (*argrest != 0) badarg = TRUE;
3429 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3430 logs to that file. We swallow the parameter and otherwise ignore it. */
3433 if (*argrest == '\0')
3436 fprintf(stderr, "exim: string expected after -X\n");
3442 if (*argrest == '\0')
3443 if (++i < argc) log_oneline = argv[i]; else
3445 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3450 /* All other initial characters are errors */
3455 } /* End of high-level switch statement */
3457 /* Failed to recognize the option, or syntax error */
3461 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3462 "option %s\n", arg);
3468 /* If -R or -S have been specified without -q, assume a single queue run. */
3470 if ( (deliver_selectstring || deliver_selectstring_sender)
3471 && queue_interval < 0)
3476 /* If usage_wanted is set we call the usage function - which never returns */
3477 if (usage_wanted) exim_usage(called_as);
3479 /* Arguments have been processed. Check for incompatibilities. */
3481 (smtp_input || extract_recipients || recipients_arg < argc) &&
3482 (daemon_listen || queue_interval >= 0 || bi_option ||
3483 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3484 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3487 msg_action_arg > 0 &&
3488 (daemon_listen || queue_interval > 0 || list_options ||
3489 (checking && msg_action != MSG_LOAD) ||
3490 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3493 (daemon_listen || queue_interval > 0) &&
3494 (sender_address != NULL || list_options || list_queue || checking ||
3498 daemon_listen && queue_interval == 0
3501 inetd_wait_mode && queue_interval >= 0
3505 (checking || smtp_input || extract_recipients ||
3506 filter_test != FTEST_NONE || bi_option)
3509 verify_address_mode &&
3510 (address_test_mode || smtp_input || extract_recipients ||
3511 filter_test != FTEST_NONE || bi_option)
3514 address_test_mode && (smtp_input || extract_recipients ||
3515 filter_test != FTEST_NONE || bi_option)
3518 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3522 deliver_selectstring != NULL && queue_interval < 0
3525 msg_action == MSG_LOAD &&
3526 (!expansion_test || expansion_test_message != NULL)
3530 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3534 /* If debugging is set up, set the file and the file descriptor to pass on to
3535 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3536 to run in the foreground. */
3538 if (debug_selector != 0)
3540 debug_file = stderr;
3541 debug_fd = fileno(debug_file);
3542 background_daemon = FALSE;
3543 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3544 if (debug_selector != D_v) /* -v only doesn't show this */
3546 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3547 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3549 if (!version_printed)
3550 show_whats_supported(stderr);
3554 /* When started with root privilege, ensure that the limits on the number of
3555 open files and the number of processes (where that is accessible) are
3556 sufficiently large, or are unset, in case Exim has been called from an
3557 environment where the limits are screwed down. Not all OS have the ability to
3558 change some of these limits. */
3562 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3568 #ifdef RLIMIT_NOFILE
3569 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3571 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3573 rlp.rlim_cur = rlp.rlim_max = 0;
3576 /* I originally chose 1000 as a nice big number that was unlikely to
3577 be exceeded. It turns out that some older OS have a fixed upper limit of
3580 if (rlp.rlim_cur < 1000)
3582 rlp.rlim_cur = rlp.rlim_max = 1000;
3583 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3585 rlp.rlim_cur = rlp.rlim_max = 256;
3586 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3587 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3594 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3596 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3598 rlp.rlim_cur = rlp.rlim_max = 0;
3601 #ifdef RLIM_INFINITY
3602 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3604 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3606 if (rlp.rlim_cur < 1000)
3608 rlp.rlim_cur = rlp.rlim_max = 1000;
3610 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3611 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3617 /* Exim is normally entered as root (but some special configurations are
3618 possible that don't do this). However, it always spins off sub-processes that
3619 set their uid and gid as required for local delivery. We don't want to pass on
3620 any extra groups that root may belong to, so we want to get rid of them all at
3623 We need to obey setgroups() at this stage, before possibly giving up root
3624 privilege for a changed configuration file, but later on we might need to
3625 check on the additional groups for the admin user privilege - can't do that
3626 till after reading the config, which might specify the exim gid. Therefore,
3627 save the group list here first. */
3629 group_count = getgroups(NGROUPS_MAX, group_list);
3630 if (group_count < 0)
3632 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3636 /* There is a fundamental difference in some BSD systems in the matter of
3637 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3638 known not to be different. On the "different" systems there is a single group
3639 list, and the first entry in it is the current group. On all other versions of
3640 Unix there is a supplementary group list, which is in *addition* to the current
3641 group. Consequently, to get rid of all extraneous groups on a "standard" system
3642 you pass over 0 groups to setgroups(), while on a "different" system you pass
3643 over a single group - the current group, which is always the first group in the
3644 list. Calling setgroups() with zero groups on a "different" system results in
3645 an error return. The following code should cope with both types of system.
3647 However, if this process isn't running as root, setgroups() can't be used
3648 since you have to be root to run it, even if throwing away groups. Not being
3649 root here happens only in some unusual configurations. We just ignore the
3652 if (setgroups(0, NULL) != 0)
3654 if (setgroups(1, group_list) != 0 && !unprivileged)
3656 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3661 /* If the configuration file name has been altered by an argument on the
3662 command line (either a new file name or a macro definition) and the caller is
3663 not root, or if this is a filter testing run, remove any setuid privilege the
3664 program has and run as the underlying user.
3666 The exim user is locked out of this, which severely restricts the use of -C
3669 Otherwise, set the real ids to the effective values (should be root unless run
3670 from inetd, which it can either be root or the exim uid, if one is configured).
3672 There is a private mechanism for bypassing some of this, in order to make it
3673 possible to test lots of configurations automatically, without having either to
3674 recompile each time, or to patch in an actual configuration file name and other
3675 values (such as the path name). If running in the test harness, pretend that
3676 configuration file changes and macro definitions haven't happened. */
3679 (!trusted_config || /* Config changed, or */
3680 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3681 real_uid != root_uid && /* Not root, and */
3682 !running_in_test_harness /* Not fudged */
3684 expansion_test /* expansion testing */
3686 filter_test != FTEST_NONE) /* Filter testing */
3688 setgroups(group_count, group_list);
3689 exim_setugid(real_uid, real_gid, FALSE,
3690 US"-C, -D, -be or -bf forces real uid");
3691 removed_privilege = TRUE;
3693 /* In the normal case when Exim is called like this, stderr is available
3694 and should be used for any logging information because attempts to write
3695 to the log will usually fail. To arrange this, we unset really_exim. However,
3696 if no stderr is available there is no point - we might as well have a go
3697 at the log (if it fails, syslog will be written).
3699 Note that if the invoker is Exim, the logs remain available. Messing with
3700 this causes unlogged successful deliveries. */
3702 if ((log_stderr != NULL) && (real_uid != exim_uid))
3703 really_exim = FALSE;
3706 /* Privilege is to be retained for the moment. It may be dropped later,
3707 depending on the job that this Exim process has been asked to do. For now, set
3708 the real uid to the effective so that subsequent re-execs of Exim are done by a
3711 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3713 /* If testing a filter, open the file(s) now, before wasting time doing other
3714 setups and reading the message. */
3716 if ((filter_test & FTEST_SYSTEM) != 0)
3718 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3721 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3723 return EXIT_FAILURE;
3727 if ((filter_test & FTEST_USER) != 0)
3729 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3732 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3734 return EXIT_FAILURE;
3738 /* Initialise lookup_list
3739 If debugging, already called above via version reporting.
3740 In either case, we initialise the list of available lookups while running
3741 as root. All dynamically modules are loaded from a directory which is
3742 hard-coded into the binary and is code which, if not a module, would be
3743 part of Exim already. Ability to modify the content of the directory
3744 is equivalent to the ability to modify a setuid binary!
3746 This needs to happen before we read the main configuration. */
3750 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3753 /* Read the main runtime configuration data; this gives up if there
3754 is a failure. It leaves the configuration file open so that the subsequent
3755 configuration data for delivery can be read if needed.
3757 NOTE: immediatly after opening the configuration file we change the working
3758 directory to "/"! Later we change to $spool_directory. We do it there, because
3759 during readconf_main() some expansion takes place already. */
3761 /* Store the initial cwd before we change directories */
3762 if ((initial_cwd = os_getcwd(NULL, 0)) == NULL)
3764 perror("exim: can't get the current working directory");
3769 -be[m] expansion test -
3770 -b[fF] filter test new
3772 -bmalware malware_test_file new
3774 -brw rewrite test new
3776 -bv[s] address verify -
3778 -bP <option> (except -bP config, which sets list_config)
3780 If any of these options is set, we suppress warnings about configuration
3781 issues (currently about tls_advertise_hosts and keep_environment not being
3784 readconf_main(checking || list_options);
3786 /* Now in directory "/" */
3788 if (cleanup_environment() == FALSE)
3789 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3792 /* If an action on specific messages is requested, or if a daemon or queue
3793 runner is being started, we need to know if Exim was called by an admin user.
3794 This is the case if the real user is root or exim, or if the real group is
3795 exim, or if one of the supplementary groups is exim or a group listed in
3796 admin_groups. We don't fail all message actions immediately if not admin_user,
3797 since some actions can be performed by non-admin users. Instead, set admin_user
3798 for later interrogation. */
3800 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3805 for (i = 0; i < group_count; i++)
3807 if (group_list[i] == exim_gid) admin_user = TRUE;
3808 else if (admin_groups != NULL)
3810 for (j = 1; j <= (int)(admin_groups[0]); j++)
3811 if (admin_groups[j] == group_list[i])
3812 { admin_user = TRUE; break; }
3814 if (admin_user) break;
3818 /* Another group of privileged users are the trusted users. These are root,
3819 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3820 are permitted to specify sender_addresses with -f on the command line, and
3821 other message parameters as well. */
3823 if (real_uid == root_uid || real_uid == exim_uid)
3824 trusted_caller = TRUE;
3829 if (trusted_users != NULL)
3831 for (i = 1; i <= (int)(trusted_users[0]); i++)
3832 if (trusted_users[i] == real_uid)
3833 { trusted_caller = TRUE; break; }
3836 if (!trusted_caller && trusted_groups != NULL)
3838 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3840 if (trusted_groups[i] == real_gid)
3841 trusted_caller = TRUE;
3842 else for (j = 0; j < group_count; j++)
3844 if (trusted_groups[i] == group_list[j])
3845 { trusted_caller = TRUE; break; }
3847 if (trusted_caller) break;
3852 /* Handle the decoding of logging options. */
3854 decode_bits(log_selector, log_selector_size, log_notall,
3855 log_selector_string, log_options, log_options_count, US"log", 0);
3860 debug_printf("configuration file is %s\n", config_main_filename);
3861 debug_printf("log selectors =");
3862 for (i = 0; i < log_selector_size; i++)
3863 debug_printf(" %08x", log_selector[i]);
3867 /* If domain literals are not allowed, check the sender address that was
3868 supplied with -f. Ditto for a stripped trailing dot. */
3870 if (sender_address != NULL)
3872 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3874 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3875 "allowed\n", sender_address);
3876 return EXIT_FAILURE;
3878 if (f_end_dot && !strip_trailing_dot)
3880 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3881 "(trailing dot not allowed)\n", sender_address);
3882 return EXIT_FAILURE;
3886 /* See if an admin user overrode our logging. */
3888 if (cmdline_syslog_name != NULL)
3892 syslog_processname = cmdline_syslog_name;
3893 log_file_path = string_copy(CUS"syslog");
3897 /* not a panic, non-privileged users should not be able to spam paniclog */
3899 "exim: you lack sufficient privilege to specify syslog process name\n");
3900 return EXIT_FAILURE;
3904 /* Paranoia check of maximum lengths of certain strings. There is a check
3905 on the length of the log file path in log.c, which will come into effect
3906 if there are any calls to write the log earlier than this. However, if we
3907 get this far but the string is very long, it is better to stop now than to
3908 carry on and (e.g.) receive a message and then have to collapse. The call to
3909 log_write() from here will cause the ultimate panic collapse if the complete
3910 file name exceeds the buffer length. */
3912 if (Ustrlen(log_file_path) > 200)
3913 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3914 "log_file_path is longer than 200 chars: aborting");
3916 if (Ustrlen(pid_file_path) > 200)
3917 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3918 "pid_file_path is longer than 200 chars: aborting");
3920 if (Ustrlen(spool_directory) > 200)
3921 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3922 "spool_directory is longer than 200 chars: aborting");
3924 /* Length check on the process name given to syslog for its TAG field,
3925 which is only permitted to be 32 characters or less. See RFC 3164. */
3927 if (Ustrlen(syslog_processname) > 32)
3928 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3929 "syslog_processname is longer than 32 chars: aborting");
3934 log_write(0, LOG_MAIN, "%s", log_oneline);
3935 return EXIT_SUCCESS;
3938 return EXIT_FAILURE;
3940 /* In some operating systems, the environment variable TMPDIR controls where
3941 temporary files are created; Exim doesn't use these (apart from when delivering
3942 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3943 If TMPDIR is found in the environment, reset it to the value defined in the
3944 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3945 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3946 EXIM_TMPDIR by the build scripts.
3952 if (environ) for (p = USS environ; *p; p++)
3953 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3955 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3956 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3958 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3963 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3964 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3965 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3966 called by a user who has set the TZ variable. This then affects the timestamps
3967 in log files and in Received: headers, and any created Date: header lines. The
3968 required timezone is settable in the configuration file, so nothing can be done
3969 about this earlier - but hopefully nothing will normally be logged earlier than
3970 this. We have to make a new environment if TZ is wrong, but don't bother if
3971 timestamps_utc is set, because then all times are in UTC anyway. */
3973 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3974 timestamps_utc = TRUE;
3977 uschar *envtz = US getenv("TZ");
3979 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3980 : timezone_string != NULL
3983 uschar **p = USS environ;
3987 if (environ) while (*p++) count++;
3988 if (!envtz) count++;
3989 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3990 if (environ) for (p = USS environ; *p; p++)
3991 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3992 if (timezone_string)
3994 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3995 sprintf(CS *newp++, "TZ=%s", timezone_string);
4000 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4001 tod_stamp(tod_log));
4005 /* Handle the case when we have removed the setuid privilege because of -C or
4006 -D. This means that the caller of Exim was not root.
4008 There is a problem if we were running as the Exim user. The sysadmin may
4009 expect this case to retain privilege because "the binary was called by the
4010 Exim user", but it hasn't, because either the -D option set macros, or the
4011 -C option set a non-trusted configuration file. There are two possibilities:
4013 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4014 to do message deliveries. Thus, the fact that it is running as a
4015 non-privileged user is plausible, and might be wanted in some special
4016 configurations. However, really_exim will have been set false when
4017 privilege was dropped, to stop Exim trying to write to its normal log
4018 files. Therefore, re-enable normal log processing, assuming the sysadmin
4019 has set up the log directory correctly.
4021 (2) If deliver_drop_privilege is not set, the configuration won't work as
4022 apparently intended, and so we log a panic message. In order to retain
4023 root for -C or -D, the caller must either be root or be invoking a
4024 trusted configuration file (when deliver_drop_privilege is false). */
4026 if ( removed_privilege
4027 && (!trusted_config || opt_D_used)
4028 && real_uid == exim_uid)
4029 if (deliver_drop_privilege)
4030 really_exim = TRUE; /* let logging work normally */
4032 log_write(0, LOG_MAIN|LOG_PANIC,
4033 "exim user lost privilege for using %s option",
4034 trusted_config? "-D" : "-C");
4036 /* Start up Perl interpreter if Perl support is configured and there is a
4037 perl_startup option, and the configuration or the command line specifies
4038 initializing starting. Note that the global variables are actually called
4039 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4042 if (perl_start_option != 0)
4043 opt_perl_at_start = (perl_start_option > 0);
4044 if (opt_perl_at_start && opt_perl_startup != NULL)
4047 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4048 errstr = init_perl(opt_perl_startup);
4051 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4052 return EXIT_FAILURE;
4054 opt_perl_started = TRUE;
4056 #endif /* EXIM_PERL */
4058 /* Log the arguments of the call if the configuration file said so. This is
4059 a debugging feature for finding out what arguments certain MUAs actually use.
4060 Don't attempt it if logging is disabled, or if listing variables or if
4061 verifying/testing addresses or expansions. */
4063 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4064 && really_exim && !list_options && !checking)
4067 uschar *p = big_buffer;
4068 Ustrcpy(p, "cwd= (failed)");
4070 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4073 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4075 for (i = 0; i < argc; i++)
4077 int len = Ustrlen(argv[i]);
4078 const uschar *printing;
4080 if (p + len + 8 >= big_buffer + big_buffer_size)
4083 log_write(0, LOG_MAIN, "%s", big_buffer);
4084 Ustrcpy(big_buffer, "...");
4087 printing = string_printing(argv[i]);
4088 if (printing[0] == 0) quote = US"\""; else
4090 const uschar *pp = printing;
4092 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4094 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4095 (p - big_buffer) - 4), printing, quote);
4099 if (LOGGING(arguments))
4100 log_write(0, LOG_MAIN, "%s", big_buffer);
4102 debug_printf("%s\n", big_buffer);
4105 /* Set the working directory to be the top-level spool directory. We don't rely
4106 on this in the code, which always uses fully qualified names, but it's useful
4107 for core dumps etc. Don't complain if it fails - the spool directory might not
4108 be generally accessible and calls with the -C option (and others) have lost
4109 privilege by now. Before the chdir, we try to ensure that the directory exists.
4112 if (Uchdir(spool_directory) != 0)
4115 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4116 dummy = /* quieten compiler */ Uchdir(spool_directory);
4119 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4120 alias file. Exim doesn't have such a concept, but this call is screwed into
4121 Sun's YP makefiles. Handle this by calling a configured script, as the real
4122 user who called Exim. The -oA option can be used to pass an argument to the
4127 (void)fclose(config_file);
4128 if (bi_command != NULL)
4132 argv[i++] = bi_command;
4133 if (alias_arg != NULL) argv[i++] = alias_arg;
4136 setgroups(group_count, group_list);
4137 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4139 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4140 (argv[1] == NULL)? US"" : argv[1]);
4142 execv(CS argv[0], (char *const *)argv);
4143 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4148 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4153 /* We moved the admin/trusted check to be immediately after reading the
4154 configuration file. We leave these prints here to ensure that syslog setup,
4155 logfile setup, and so on has already happened. */
4157 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4158 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4160 /* Only an admin user may start the daemon or force a queue run in the default
4161 configuration, but the queue run restriction can be relaxed. Only an admin
4162 user may request that a message be returned to its sender forthwith. Only an
4163 admin user may specify a debug level greater than D_v (because it might show
4164 passwords, etc. in lookup queries). Only an admin user may request a queue
4165 count. Only an admin user can use the test interface to scan for email
4166 (because Exim will be in the spool dir and able to look at mails). */
4170 BOOL debugset = (debug_selector & ~D_v) != 0;
4171 if (deliver_give_up || daemon_listen || malware_test_file ||
4172 (count_queue && queue_list_requires_admin) ||
4173 (list_queue && queue_list_requires_admin) ||
4174 (queue_interval >= 0 && prod_requires_admin) ||
4175 (debugset && !running_in_test_harness))
4177 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4182 /* If the real user is not root or the exim uid, the argument for passing
4183 in an open TCP/IP connection for another message is not permitted, nor is
4184 running with the -N option for any delivery action, unless this call to exim is
4185 one that supplied an input message, or we are using a patched exim for
4186 regression testing. */
4188 if (real_uid != root_uid && real_uid != exim_uid &&
4189 (continue_hostname != NULL ||
4191 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4192 )) && !running_in_test_harness)
4194 fprintf(stderr, "exim: Permission denied\n");
4195 return EXIT_FAILURE;
4198 /* If the caller is not trusted, certain arguments are ignored when running for
4199 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4200 Note that authority for performing certain actions on messages is tested in the
4201 queue_action() function. */
4203 if (!trusted_caller && !checking)
4205 sender_host_name = sender_host_address = interface_address =
4206 sender_ident = received_protocol = NULL;
4207 sender_host_port = interface_port = 0;
4208 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4211 /* If a sender host address is set, extract the optional port number off the
4212 end of it and check its syntax. Do the same thing for the interface address.
4213 Exim exits if the syntax is bad. */
4217 if (sender_host_address != NULL)
4218 sender_host_port = check_port(sender_host_address);
4219 if (interface_address != NULL)
4220 interface_port = check_port(interface_address);
4223 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4228 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4229 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4233 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4234 return EXIT_FAILURE;
4238 /* If an SMTP message is being received check to see if the standard input is a
4239 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4240 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4245 union sockaddr_46 inetd_sock;
4246 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4247 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4249 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4250 if (family == AF_INET || family == AF_INET6)
4252 union sockaddr_46 interface_sock;
4253 size = sizeof(interface_sock);
4255 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4256 interface_address = host_ntoa(-1, &interface_sock, NULL,
4259 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4261 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4264 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4265 NULL, &sender_host_port);
4266 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4267 "inetd is not supported when mua_wrapper is set");
4272 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4273 return EXIT_FAILURE;
4279 /* If the load average is going to be needed while receiving a message, get it
4280 now for those OS that require the first call to os_getloadavg() to be done as
4281 root. There will be further calls later for each message received. */
4283 #ifdef LOAD_AVG_NEEDS_ROOT
4284 if (receiving_message &&
4285 (queue_only_load >= 0 ||
4286 (is_inetd && smtp_load_reserve >= 0)
4289 load_average = OS_GETLOADAVG();
4293 /* The queue_only configuration option can be overridden by -odx on the command
4294 line, except that if queue_only_override is false, queue_only cannot be unset
4295 from the command line. */
4297 if (queue_only_set && (queue_only_override || arg_queue_only))
4298 queue_only = arg_queue_only;
4300 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4303 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4304 if (arg_smtp_receive_timeout >= 0)
4305 smtp_receive_timeout = arg_smtp_receive_timeout;
4307 /* If Exim was started with root privilege, unless we have already removed the
4308 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4309 except when starting the daemon or doing some kind of delivery or address
4310 testing (-bt). These are the only cases when root need to be retained. We run
4311 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4312 retained only for starting the daemon. We always do the initgroups() in this
4313 situation (controlled by the TRUE below), in order to be as close as possible
4314 to the state Exim usually runs in. */
4316 if (!unprivileged && /* originally had root AND */
4317 !removed_privilege && /* still got root AND */
4318 !daemon_listen && /* not starting the daemon */
4319 queue_interval <= 0 && /* (either kind of daemon) */
4321 deliver_drop_privilege || /* requested unprivileged */
4323 queue_interval < 0 && /* not running the queue */
4324 (msg_action_arg < 0 || /* and */
4325 msg_action != MSG_DELIVER) && /* not delivering and */
4326 (!checking || !address_test_mode) /* not address checking */
4330 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4333 /* When we are retaining a privileged uid, we still change to the exim gid. */
4338 rv = setgid(exim_gid);
4339 /* Impact of failure is that some stuff might end up with an incorrect group.
4340 We track this for failures from root, since any attempt to change privilege
4341 by root should succeed and failures should be examined. For non-root,
4342 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4343 no need to complain then. */
4346 if (!(unprivileged || removed_privilege))
4349 "exim: changing group failed: %s\n", strerror(errno));
4353 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4354 (long int)exim_gid, strerror(errno));
4358 /* Handle a request to scan a file for malware */
4359 if (malware_test_file)
4361 #ifdef WITH_CONTENT_SCAN
4363 set_process_info("scanning file for malware");
4364 result = malware_in_file(malware_test_file);
4367 printf("No malware found.\n");
4372 printf("Malware lookup returned non-okay/fail: %d\n", result);
4376 printf("Malware found: %s\n", malware_name);
4378 printf("Malware scan detected malware of unknown name.\n");
4380 printf("Malware scanning not enabled at compile time.\n");
4385 /* Handle a request to list the delivery queue */
4389 set_process_info("listing the queue");
4390 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4394 /* Handle a request to count the delivery queue */
4398 set_process_info("counting the queue");
4403 /* Handle actions on specific messages, except for the force delivery and
4404 message load actions, which are done below. Some actions take a whole list of
4405 message ids, which are known to continue up to the end of the arguments. Others
4406 take a single message id and then operate on the recipients list. */
4408 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4410 int yield = EXIT_SUCCESS;
4411 set_process_info("acting on specified messages");
4413 if (!one_msg_action)
4415 for (i = msg_action_arg; i < argc; i++)
4416 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4417 yield = EXIT_FAILURE;
4420 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4421 recipients_arg)) yield = EXIT_FAILURE;
4425 /* We used to set up here to skip reading the ACL section, on
4426 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4427 Now, since the intro of the ${acl } expansion, ACL definitions may be
4428 needed in transports so we lost the optimisation. */
4432 /* The configuration data will have been read into POOL_PERM because we won't
4433 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4434 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4435 configuration were read into POOL_MAIN, because we don't do any resets till
4436 later on. However, it seems right, and it does ensure that both pools get used.
4439 store_pool = POOL_MAIN;
4441 /* Handle the -brt option. This is for checking out retry configurations.
4442 The next three arguments are a domain name or a complete address, and
4443 optionally two error numbers. All it does is to call the function that
4444 scans the retry configuration data. */
4446 if (test_retry_arg >= 0)
4448 retry_config *yield;
4449 int basic_errno = 0;
4453 if (test_retry_arg >= argc)
4455 printf("-brt needs a domain or address argument\n");
4456 exim_exit(EXIT_FAILURE);
4458 s1 = argv[test_retry_arg++];
4461 /* If the first argument contains no @ and no . it might be a local user
4462 or it might be a single-component name. Treat as a domain. */
4464 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4466 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4467 "being \ntreated as a one-component domain, not as a local part.\n\n",
4471 /* There may be an optional second domain arg. */
4473 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4474 s2 = argv[test_retry_arg++];
4476 /* The final arg is an error name */
4478 if (test_retry_arg < argc)
4480 uschar *ss = argv[test_retry_arg];
4482 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4485 printf("%s\n", CS error);
4486 return EXIT_FAILURE;
4489 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4490 code > 100 as an error is for matching codes to the decade. Turn them into
4491 a real error code, off the decade. */
4493 if (basic_errno == ERRNO_MAIL4XX ||
4494 basic_errno == ERRNO_RCPT4XX ||
4495 basic_errno == ERRNO_DATA4XX)
4497 int code = (more_errno >> 8) & 255;
4499 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4500 else if (code > 100)
4501 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4505 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4506 if (yield == NULL) printf("No retry information found\n"); else
4509 more_errno = yield->more_errno;
4510 printf("Retry rule: %s ", yield->pattern);
4512 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4514 printf("quota%s%s ",
4515 (more_errno > 0)? "_" : "",
4516 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4518 else if (yield->basic_errno == ECONNREFUSED)
4520 printf("refused%s%s ",
4521 (more_errno > 0)? "_" : "",
4522 (more_errno == 'M')? "MX" :
4523 (more_errno == 'A')? "A" : "");
4525 else if (yield->basic_errno == ETIMEDOUT)
4528 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4530 if (more_errno != 0) printf("_%s",
4531 (more_errno == 'M')? "MX" : "A");
4534 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4535 printf("auth_failed ");
4538 for (r = yield->rules; r != NULL; r = r->next)
4540 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4541 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4547 printf(",%d.", x/1000);
4561 exim_exit(EXIT_SUCCESS);
4564 /* Handle a request to list one or more configuration options */
4565 /* If -n was set, we suppress some information */
4569 set_process_info("listing variables");
4570 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4571 else for (i = recipients_arg; i < argc; i++)
4574 (Ustrcmp(argv[i], "router") == 0 ||
4575 Ustrcmp(argv[i], "transport") == 0 ||
4576 Ustrcmp(argv[i], "authenticator") == 0 ||
4577 Ustrcmp(argv[i], "macro") == 0 ||
4578 Ustrcmp(argv[i], "environment") == 0))
4580 readconf_print(argv[i+1], argv[i], flag_n);
4583 else readconf_print(argv[i], NULL, flag_n);
4585 exim_exit(EXIT_SUCCESS);
4590 set_process_info("listing config");
4591 readconf_print(US"config", NULL, flag_n);
4592 exim_exit(EXIT_SUCCESS);
4596 /* Initialise subsystems as required */
4597 #ifndef DISABLE_DKIM
4603 /* Handle a request to deliver one or more messages that are already on the
4604 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4605 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4607 Delivery of specific messages is typically used for a small number when
4608 prodding by hand (when the option forced_delivery will be set) or when
4609 re-execing to regain root privilege. Each message delivery must happen in a
4610 separate process, so we fork a process for each one, and run them sequentially
4611 so that debugging output doesn't get intertwined, and to avoid spawning too
4612 many processes if a long list is given. However, don't fork for the last one;
4613 this saves a process in the common case when Exim is called to deliver just one
4616 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4618 if (prod_requires_admin && !admin_user)
4620 fprintf(stderr, "exim: Permission denied\n");
4621 exim_exit(EXIT_FAILURE);
4623 set_process_info("delivering specified messages");
4624 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4625 for (i = msg_action_arg; i < argc; i++)
4630 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4631 else if ((pid = fork()) == 0)
4633 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4634 _exit(EXIT_SUCCESS);
4638 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4640 exim_exit(EXIT_FAILURE);
4644 exim_exit(EXIT_SUCCESS);
4648 /* If only a single queue run is requested, without SMTP listening, we can just
4649 turn into a queue runner, with an optional starting message id. */
4651 if (queue_interval == 0 && !daemon_listen)
4653 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4654 (start_queue_run_id == NULL)? US"" : US" starting at ",
4655 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4656 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4657 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4659 set_process_info("running the '%s' queue (single queue run)", queue_name);
4661 set_process_info("running the queue (single queue run)");
4662 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4663 exim_exit(EXIT_SUCCESS);
4667 /* Find the login name of the real user running this process. This is always
4668 needed when receiving a message, because it is written into the spool file. It
4669 may also be used to construct a from: or a sender: header, and in this case we
4670 need the user's full name as well, so save a copy of it, checked for RFC822
4671 syntax and munged if necessary, if it hasn't previously been set by the -F
4672 argument. We may try to get the passwd entry more than once, in case NIS or
4673 other delays are in evidence. Save the home directory for use in filter testing
4678 if ((pw = getpwuid(real_uid)) != NULL)
4680 originator_login = string_copy(US pw->pw_name);
4681 originator_home = string_copy(US pw->pw_dir);
4683 /* If user name has not been set by -F, set it from the passwd entry
4684 unless -f has been used to set the sender address by a trusted user. */
4686 if (originator_name == NULL)
4688 if (sender_address == NULL ||
4689 (!trusted_caller && filter_test == FTEST_NONE))
4691 uschar *name = US pw->pw_gecos;
4692 uschar *amp = Ustrchr(name, '&');
4695 /* Most Unix specify that a '&' character in the gecos field is
4696 replaced by a copy of the login name, and some even specify that
4697 the first character should be upper cased, so that's what we do. */
4702 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4703 amp - name, name, &loffset, originator_login, amp + 1);
4704 buffer[loffset] = toupper(buffer[loffset]);
4708 /* If a pattern for matching the gecos field was supplied, apply
4709 it and then expand the name string. */
4711 if (gecos_pattern != NULL && gecos_name != NULL)
4714 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4716 if (regex_match_and_setup(re, name, 0, -1))
4718 uschar *new_name = expand_string(gecos_name);
4720 if (new_name != NULL)
4722 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4723 "gecos field \"%s\"\n", new_name, name);
4726 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4727 "\"%s\": %s\n", gecos_name, expand_string_message);
4729 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4730 "gecos field \"%s\"\n", gecos_pattern, name);
4731 store_free((void *)re);
4733 originator_name = string_copy(name);
4736 /* A trusted caller has used -f but not -F */
4738 else originator_name = US"";
4741 /* Break the retry loop */
4746 if (++i > finduser_retries) break;
4750 /* If we cannot get a user login, log the incident and give up, unless the
4751 configuration specifies something to use. When running in the test harness,
4752 any setting of unknown_login overrides the actual name. */
4754 if (originator_login == NULL || running_in_test_harness)
4756 if (unknown_login != NULL)
4758 originator_login = expand_string(unknown_login);
4759 if (originator_name == NULL && unknown_username != NULL)
4760 originator_name = expand_string(unknown_username);
4761 if (originator_name == NULL) originator_name = US"";
4763 if (originator_login == NULL)
4764 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4768 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4771 originator_name = string_copy(parse_fix_phrase(originator_name,
4772 Ustrlen(originator_name), big_buffer, big_buffer_size));
4774 /* If a message is created by this call of Exim, the uid/gid of its originator
4775 are those of the caller. These values are overridden if an existing message is
4776 read in from the spool. */
4778 originator_uid = real_uid;
4779 originator_gid = real_gid;
4781 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4782 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4784 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4785 returns. We leave this till here so that the originator_ fields are available
4786 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4789 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4793 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4794 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4795 "mua_wrapper is set");
4800 /* If the sender ident has not been set (by a trusted caller) set it to
4801 the caller. This will get overwritten below for an inetd call. If a trusted
4802 caller has set it empty, unset it. */
4804 if (sender_ident == NULL) sender_ident = originator_login;
4805 else if (sender_ident[0] == 0) sender_ident = NULL;
4807 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4808 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4809 originator_* variables set. */
4811 if (test_rewrite_arg >= 0)
4813 really_exim = FALSE;
4814 if (test_rewrite_arg >= argc)
4816 printf("-brw needs an address argument\n");
4817 exim_exit(EXIT_FAILURE);
4819 rewrite_test(argv[test_rewrite_arg]);
4820 exim_exit(EXIT_SUCCESS);
4823 /* A locally-supplied message is considered to be coming from a local user
4824 unless a trusted caller supplies a sender address with -f, or is passing in the
4825 message via SMTP (inetd invocation or otherwise). */
4827 if ((sender_address == NULL && !smtp_input) ||
4828 (!trusted_caller && filter_test == FTEST_NONE))
4830 sender_local = TRUE;
4832 /* A trusted caller can supply authenticated_sender and authenticated_id
4833 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4834 defaults except when host checking. */
4836 if (authenticated_sender == NULL && !host_checking)
4837 authenticated_sender = string_sprintf("%s@%s", originator_login,
4838 qualify_domain_sender);
4839 if (authenticated_id == NULL && !host_checking)
4840 authenticated_id = originator_login;
4843 /* Trusted callers are always permitted to specify the sender address.
4844 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4845 is specified is the empty address. However, if a trusted caller does not
4846 specify a sender address for SMTP input, we leave sender_address unset. This
4847 causes the MAIL commands to be honoured. */
4849 if ((!smtp_input && sender_address == NULL) ||
4850 !receive_check_set_sender(sender_address))
4852 /* Either the caller is not permitted to set a general sender, or this is
4853 non-SMTP input and the trusted caller has not set a sender. If there is no
4854 sender, or if a sender other than <> is set, override with the originator's
4855 login (which will get qualified below), except when checking things. */
4857 if (sender_address == NULL /* No sender_address set */
4859 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4860 !checking)) /* Not running tests, including filter tests */
4862 sender_address = originator_login;
4863 sender_address_forced = FALSE;
4864 sender_address_domain = 0;
4868 /* Remember whether an untrusted caller set the sender address */
4870 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4872 /* Ensure that the sender address is fully qualified unless it is the empty
4873 address, which indicates an error message, or doesn't exist (root caller, smtp
4874 interface, no -f argument). */
4876 if (sender_address != NULL && sender_address[0] != 0 &&
4877 sender_address_domain == 0)
4878 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4879 qualify_domain_sender);
4881 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4883 /* Handle a request to verify a list of addresses, or test them for delivery.
4884 This must follow the setting of the sender address, since routers can be
4885 predicated upon the sender. If no arguments are given, read addresses from
4886 stdin. Set debug_level to at least D_v to get full output for address testing.
4889 if (verify_address_mode || address_test_mode)
4892 int flags = vopt_qualify;
4894 if (verify_address_mode)
4896 if (!verify_as_sender) flags |= vopt_is_recipient;
4897 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4902 flags |= vopt_is_recipient;
4903 debug_selector |= D_v;
4904 debug_file = stderr;
4905 debug_fd = fileno(debug_file);
4906 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4909 if (recipients_arg < argc)
4911 while (recipients_arg < argc)
4913 uschar *s = argv[recipients_arg++];
4916 BOOL finished = FALSE;
4917 uschar *ss = parse_find_address_end(s, FALSE);
4918 if (*ss == ',') *ss = 0; else finished = TRUE;
4919 test_address(s, flags, &exit_value);
4922 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4929 uschar *s = get_stdinput(NULL, NULL);
4930 if (s == NULL) break;
4931 test_address(s, flags, &exit_value);
4935 exim_exit(exit_value);
4938 /* Handle expansion checking. Either expand items on the command line, or read
4939 from stdin if there aren't any. If -Mset was specified, load the message so
4940 that its variables can be used, but restrict this facility to admin users.
4941 Otherwise, if -bem was used, read a message from stdin. */
4945 dns_init(FALSE, FALSE, FALSE);
4946 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4948 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4951 fprintf(stderr, "exim: permission denied\n");
4954 message_id = argv[msg_action_arg];
4955 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4956 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4957 printf ("Failed to load message datafile %s\n", message_id);
4958 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4959 printf ("Failed to load message %s\n", message_id);
4962 /* Read a test message from a file. We fudge it up to be on stdin, saving
4963 stdin itself for later reading of expansion strings. */
4965 else if (expansion_test_message != NULL)
4967 int save_stdin = dup(0);
4968 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4971 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4973 return EXIT_FAILURE;
4976 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4977 message_ended = END_NOTENDED;
4978 read_message_body(receive_msg(extract_recipients));
4979 message_linecount += body_linecount;
4980 (void)dup2(save_stdin, 0);
4981 (void)close(save_stdin);
4982 clearerr(stdin); /* Required by Darwin */
4985 /* Allow $recipients for this testing */
4987 enable_dollar_recipients = TRUE;
4989 /* Expand command line items */
4991 if (recipients_arg < argc)
4993 while (recipients_arg < argc)
4995 uschar *s = argv[recipients_arg++];
4996 uschar *ss = expand_string(s);
4997 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4998 else printf("%s\n", CS ss);
5006 char *(*fn_readline)(const char *) = NULL;
5007 void (*fn_addhist)(const char *) = NULL;
5010 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5016 uschar *source = get_stdinput(fn_readline, fn_addhist);
5017 if (source == NULL) break;
5018 ss = expand_string(source);
5020 printf ("Failed: %s\n", expand_string_message);
5021 else printf("%s\n", CS ss);
5025 if (dlhandle != NULL) dlclose(dlhandle);
5029 /* The data file will be open after -Mset */
5031 if (deliver_datafile >= 0)
5033 (void)close(deliver_datafile);
5034 deliver_datafile = -1;
5037 exim_exit(EXIT_SUCCESS);
5041 /* The active host name is normally the primary host name, but it can be varied
5042 for hosts that want to play several parts at once. We need to ensure that it is
5043 set for host checking, and for receiving messages. */
5045 smtp_active_hostname = primary_hostname;
5046 if (raw_active_hostname != NULL)
5048 uschar *nah = expand_string(raw_active_hostname);
5051 if (!expand_string_forcedfail)
5052 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5053 "(smtp_active_hostname): %s", raw_active_hostname,
5054 expand_string_message);
5056 else if (nah[0] != 0) smtp_active_hostname = nah;
5059 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5060 given IP address so that the blocking and relay configuration can be tested.
5061 Unless a sender_ident was set by -oMt, we discard it (the default is the
5062 caller's login name). An RFC 1413 call is made only if we are running in the
5063 test harness and an incoming interface and both ports are specified, because
5064 there is no TCP/IP call to find the ident for. */
5071 if (!sender_ident_set)
5073 sender_ident = NULL;
5074 if (running_in_test_harness && sender_host_port != 0 &&
5075 interface_address != NULL && interface_port != 0)
5076 verify_get_ident(1413);
5079 /* In case the given address is a non-canonical IPv6 address, canonicize
5080 it. The code works for both IPv4 and IPv6, as it happens. */
5082 size = host_aton(sender_host_address, x);
5083 sender_host_address = store_get(48); /* large enough for full IPv6 */
5084 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5086 /* Now set up for testing */
5088 host_build_sender_fullhost();
5092 sender_local = FALSE;
5093 sender_host_notsocket = TRUE;
5094 debug_file = stderr;
5095 debug_fd = fileno(debug_file);
5096 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5097 "**** but without any ident (RFC 1413) callback.\n"
5098 "**** This is not for real!\n\n",
5099 sender_host_address);
5101 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5102 if (verify_check_host(&hosts_connection_nolog) == OK)
5103 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5104 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5106 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5107 because a log line has already been written for all its failure exists
5108 (usually "connection refused: <reason>") and writing another one is
5109 unnecessary clutter. */
5111 if (smtp_start_session())
5113 reset_point = store_get(0);
5116 store_reset(reset_point);
5117 if (smtp_setup_msg() <= 0) break;
5118 if (!receive_msg(FALSE)) break;
5122 exim_exit(EXIT_SUCCESS);
5126 /* Arrange for message reception if recipients or SMTP were specified;
5127 otherwise complain unless a version print (-bV) happened or this is a filter
5128 verification test or info dump.
5129 In the former case, show the configuration file name. */
5131 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5133 if (version_printed)
5135 printf("Configuration file is %s\n", config_main_filename);
5136 return EXIT_SUCCESS;
5139 if (info_flag != CMDINFO_NONE)
5141 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5142 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5145 if (filter_test == FTEST_NONE)
5146 exim_usage(called_as);
5150 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5151 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5152 that we are not called from inetd, because that is rejected above. The
5153 following configuration settings are forced here:
5155 (1) Synchronous delivery (-odi)
5156 (2) Errors to stderr (-oep == -oeq)
5157 (3) No parallel remote delivery
5158 (4) Unprivileged delivery
5160 We don't force overall queueing options because there are several of them;
5161 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5162 to override any SMTP queueing. */
5166 synchronous_delivery = TRUE;
5167 arg_error_handling = ERRORS_STDERR;
5168 remote_max_parallel = 1;
5169 deliver_drop_privilege = TRUE;
5171 queue_smtp_domains = NULL;
5173 message_utf8_downconvert = -1; /* convert-if-needed */
5178 /* Prepare to accept one or more new messages on the standard input. When a
5179 message has been read, its id is returned in message_id[]. If doing immediate
5180 delivery, we fork a delivery process for each received message, except for the
5181 last one, where we can save a process switch.
5183 It is only in non-smtp mode that error_handling is allowed to be changed from
5184 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5185 sendmail error modes other than -oem ever actually used? Later: yes.) */
5187 if (!smtp_input) error_handling = arg_error_handling;
5189 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5190 logging being sent down the socket and make an identd call to get the
5195 (void)fclose(stderr);
5196 exim_nullstd(); /* Re-open to /dev/null */
5197 verify_get_ident(IDENT_PORT);
5198 host_build_sender_fullhost();
5199 set_process_info("handling incoming connection from %s via inetd",
5203 /* If the sender host address has been set, build sender_fullhost if it hasn't
5204 already been done (which it will have been for inetd). This caters for the
5205 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5206 so that the test for IP options is skipped for -bs input. */
5208 if (sender_host_address != NULL && sender_fullhost == NULL)
5210 host_build_sender_fullhost();
5211 set_process_info("handling incoming connection from %s via -oMa",
5213 sender_host_notsocket = TRUE;
5216 /* Otherwise, set the sender host as unknown except for inetd calls. This
5217 prevents host checking in the case of -bs not from inetd and also for -bS. */
5219 else if (!is_inetd) sender_host_unknown = TRUE;
5221 /* If stdout does not exist, then dup stdin to stdout. This can happen
5222 if exim is started from inetd. In this case fd 0 will be set to the socket,
5223 but fd 1 will not be set. This also happens for passed SMTP channels. */
5225 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5227 /* Set up the incoming protocol name and the state of the program. Root is
5228 allowed to force received protocol via the -oMr option above. If we have come
5229 via inetd, the process info has already been set up. We don't set
5230 received_protocol here for smtp input, as it varies according to
5231 batch/HELO/EHLO/AUTH/TLS. */
5235 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5236 smtp_batched_input? "batched " : "",
5237 (sender_address!= NULL)? sender_address : originator_login);
5241 if (received_protocol == NULL)
5242 received_protocol = string_sprintf("local%s", called_as);
5243 set_process_info("accepting a local non-SMTP message from <%s>",
5247 /* Initialize the session_local_queue-only flag (this will be ignored if
5248 mua_wrapper is set) */
5251 session_local_queue_only = queue_only;
5253 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5254 the spool if so configured. On failure, we must not attempt to send an error
5255 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5256 error code is given.) */
5258 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5260 fprintf(stderr, "exim: insufficient disk space\n");
5261 return EXIT_FAILURE;
5264 /* If this is smtp input of any kind, real or batched, handle the start of the
5267 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5268 because a log line has already been written for all its failure exists
5269 (usually "connection refused: <reason>") and writing another one is
5270 unnecessary clutter. */
5276 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5277 if (verify_check_host(&hosts_connection_nolog) == OK)
5278 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5279 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5280 if (!smtp_start_session())
5283 exim_exit(EXIT_SUCCESS);
5287 /* Otherwise, set up the input size limit here. */
5291 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5292 if (expand_string_message != NULL)
5294 if (thismessage_size_limit == -1)
5295 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5296 "message_size_limit: %s", expand_string_message);
5298 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5299 "message_size_limit: %s", expand_string_message);
5303 /* Loop for several messages when reading SMTP input. If we fork any child
5304 processes, we don't want to wait for them unless synchronous delivery is
5305 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5306 same as SIG_DFL, despite the fact that documentation often lists the default as
5307 "ignore". This is a confusing area. This is what I know:
5309 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5310 processes that complete simply to go away without ever becoming defunct. You
5311 can't then wait for them - but we don't want to wait for them in the
5312 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5313 happen for all OS (e.g. *BSD is different).
5315 But that's not the end of the story. Some (many? all?) systems have the
5316 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5317 has by default, so it seems that the difference is merely one of default
5318 (compare restarting vs non-restarting signals).
5320 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5321 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5322 of the loop below. Paranoia rules.
5324 February 2003: That's *still* not the end of the story. There are now versions
5325 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5326 process then calls waitpid(), a grumble is written to the system log, because
5327 this is logically inconsistent. In other words, it doesn't like the paranoia.
5328 As a consequenc of this, the waitpid() below is now excluded if we are sure
5329 that SIG_IGN works. */
5331 if (!synchronous_delivery)
5334 struct sigaction act;
5335 act.sa_handler = SIG_IGN;
5336 sigemptyset(&(act.sa_mask));
5337 act.sa_flags = SA_NOCLDWAIT;
5338 sigaction(SIGCHLD, &act, NULL);
5340 signal(SIGCHLD, SIG_IGN);
5344 /* Save the current store pool point, for resetting at the start of
5345 each message, and save the real sender address, if any. */
5347 reset_point = store_get(0);
5348 real_sender_address = sender_address;
5350 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5351 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5356 store_reset(reset_point);
5359 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5360 input and build the recipients list, before calling receive_msg() to read the
5361 message proper. Whatever sender address is given in the SMTP transaction is
5362 often ignored for local senders - we use the actual sender, which is normally
5363 either the underlying user running this process or a -f argument provided by
5364 a trusted caller. It is saved in real_sender_address. The test for whether to
5365 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5370 if ((rc = smtp_setup_msg()) > 0)
5372 if (real_sender_address != NULL &&
5373 !receive_check_set_sender(sender_address))
5375 sender_address = raw_sender = real_sender_address;
5376 sender_address_unrewritten = NULL;
5379 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5380 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5381 the very end. The result of the ACL is ignored (as for other non-SMTP
5382 messages). It is run for its potential side effects. */
5384 if (smtp_batched_input && acl_not_smtp_start != NULL)
5386 uschar *user_msg, *log_msg;
5387 enable_dollar_recipients = TRUE;
5388 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5389 &user_msg, &log_msg);
5390 enable_dollar_recipients = FALSE;
5393 /* Now get the data for the message */
5395 more = receive_msg(extract_recipients);
5396 if (message_id[0] == 0)
5399 smtp_log_no_mail(); /* Log no mail if configured */
5400 exim_exit(EXIT_FAILURE);
5405 smtp_log_no_mail(); /* Log no mail if configured */
5406 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5410 /* In the non-SMTP case, we have all the information from the command
5411 line, but must process it in case it is in the more general RFC822
5412 format, and in any case, to detect syntax errors. Also, it appears that
5413 the use of comma-separated lists as single arguments is common, so we
5414 had better support them. */
5420 int count = argc - recipients_arg;
5421 uschar **list = argv + recipients_arg;
5423 /* These options cannot be changed dynamically for non-SMTP messages */
5425 active_local_sender_retain = local_sender_retain;
5426 active_local_from_check = local_from_check;
5428 /* Save before any rewriting */
5430 raw_sender = string_copy(sender_address);
5432 /* Loop for each argument */
5434 for (i = 0; i < count; i++)
5436 int start, end, domain;
5438 uschar *s = list[i];
5440 /* Loop for each comma-separated address */
5444 BOOL finished = FALSE;
5446 uschar *ss = parse_find_address_end(s, FALSE);
5448 if (*ss == ',') *ss = 0; else finished = TRUE;
5450 /* Check max recipients - if -t was used, these aren't recipients */
5452 if (recipients_max > 0 && ++rcount > recipients_max &&
5453 !extract_recipients)
5454 if (error_handling == ERRORS_STDERR)
5456 fprintf(stderr, "exim: too many recipients\n");
5457 exim_exit(EXIT_FAILURE);
5462 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5463 errors_sender_rc : EXIT_FAILURE;
5468 BOOL b = allow_utf8_domains;
5469 allow_utf8_domains = TRUE;
5472 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5475 if (string_is_utf8(recipient))
5476 message_smtputf8 = TRUE;
5478 allow_utf8_domains = b;
5481 if (domain == 0 && !allow_unqualified_recipient)
5484 errmess = US"unqualified recipient address not allowed";
5487 if (recipient == NULL)
5489 if (error_handling == ERRORS_STDERR)
5491 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5492 string_printing(list[i]), errmess);
5493 exim_exit(EXIT_FAILURE);
5499 eblock.text1 = string_printing(list[i]);
5500 eblock.text2 = errmess;
5502 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5503 errors_sender_rc : EXIT_FAILURE;
5507 receive_add_recipient(recipient, -1);
5510 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5514 /* Show the recipients when debugging */
5519 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5520 if (recipients_list != NULL)
5522 debug_printf("Recipients:\n");
5523 for (i = 0; i < recipients_count; i++)
5524 debug_printf(" %s\n", recipients_list[i].address);
5528 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5529 ignored; rejecting here would just add complication, and it can just as
5530 well be done later. Allow $recipients to be visible in the ACL. */
5532 if (acl_not_smtp_start)
5534 uschar *user_msg, *log_msg;
5535 enable_dollar_recipients = TRUE;
5536 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5537 &user_msg, &log_msg);
5538 enable_dollar_recipients = FALSE;
5541 /* Pause for a while waiting for input. If none received in that time,
5542 close the logfile, if we had one open; then if we wait for a long-running
5543 datasource (months, in one use-case) log rotation will not leave us holding
5546 if (!receive_timeout)
5548 struct timeval t = { 30*60, 0 }; /* 30 minutess */
5551 FD_ZERO(&r); FD_SET(0, &r);
5552 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5555 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5556 will just read the headers for the message, and not write anything onto the
5559 message_ended = END_NOTENDED;
5560 more = receive_msg(extract_recipients);
5562 /* more is always FALSE here (not SMTP message) when reading a message
5563 for real; when reading the headers of a message for filter testing,
5564 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5566 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5567 } /* Non-SMTP message reception */
5569 /* If this is a filter testing run, there are headers in store, but
5570 no message on the spool. Run the filtering code in testing mode, setting
5571 the domain to the qualify domain and the local part to the current user,
5572 unless they have been set by options. The prefix and suffix are left unset
5573 unless specified. The the return path is set to to the sender unless it has
5574 already been set from a return-path header in the message. */
5576 if (filter_test != FTEST_NONE)
5578 deliver_domain = (ftest_domain != NULL)?
5579 ftest_domain : qualify_domain_recipient;
5580 deliver_domain_orig = deliver_domain;
5581 deliver_localpart = (ftest_localpart != NULL)?
5582 ftest_localpart : originator_login;
5583 deliver_localpart_orig = deliver_localpart;
5584 deliver_localpart_prefix = ftest_prefix;
5585 deliver_localpart_suffix = ftest_suffix;
5586 deliver_home = originator_home;
5588 if (return_path == NULL)
5590 printf("Return-path copied from sender\n");
5591 return_path = string_copy(sender_address);
5594 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5595 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5597 receive_add_recipient(
5598 string_sprintf("%s%s%s@%s",
5599 (ftest_prefix == NULL)? US"" : ftest_prefix,
5601 (ftest_suffix == NULL)? US"" : ftest_suffix,
5602 deliver_domain), -1);
5604 printf("Recipient = %s\n", recipients_list[0].address);
5605 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5606 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5608 if (chdir("/")) /* Get away from wherever the user is running this from */
5610 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5611 exim_exit(EXIT_FAILURE);
5614 /* Now we run either a system filter test, or a user filter test, or both.
5615 In the latter case, headers added by the system filter will persist and be
5616 available to the user filter. We need to copy the filter variables
5619 if ((filter_test & FTEST_SYSTEM) != 0)
5621 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5622 exim_exit(EXIT_FAILURE);
5625 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5627 if ((filter_test & FTEST_USER) != 0)
5629 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5630 exim_exit(EXIT_FAILURE);
5633 exim_exit(EXIT_SUCCESS);
5636 /* Else act on the result of message reception. We should not get here unless
5637 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5638 will be TRUE. If it is not, check on the number of messages received in this
5641 if (!session_local_queue_only &&
5642 smtp_accept_queue_per_connection > 0 &&
5643 receive_messagecount > smtp_accept_queue_per_connection)
5645 session_local_queue_only = TRUE;
5646 queue_only_reason = 2;
5649 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5650 and queue_only_load is set, check that the load average is below it. If it is
5651 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5652 default), we put the whole session into queue_only mode. It then remains this
5653 way for any subsequent messages on the same SMTP connection. This is a
5654 deliberate choice; even though the load average may fall, it doesn't seem
5655 right to deliver later messages on the same call when not delivering earlier
5656 ones. However, there are odd cases where this is not wanted, so this can be
5657 changed by setting queue_only_load_latch false. */
5659 local_queue_only = session_local_queue_only;
5660 if (!local_queue_only && queue_only_load >= 0)
5662 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5663 if (local_queue_only)
5665 queue_only_reason = 3;
5666 if (queue_only_load_latch) session_local_queue_only = TRUE;
5670 /* If running as an MUA wrapper, all queueing options and freezing options
5674 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5676 /* Log the queueing here, when it will get a message id attached, but
5677 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5680 if (local_queue_only) switch(queue_only_reason)
5683 log_write(L_delay_delivery,
5684 LOG_MAIN, "no immediate delivery: more than %d messages "
5685 "received in one connection", smtp_accept_queue_per_connection);
5689 log_write(L_delay_delivery,
5690 LOG_MAIN, "no immediate delivery: load average %.2f",
5691 (double)load_average/1000.0);
5695 /* Else do the delivery unless the ACL or local_scan() called for queue only
5696 or froze the message. Always deliver in a separate process. A fork failure is
5697 not a disaster, as the delivery will eventually happen on a subsequent queue
5698 run. The search cache must be tidied before the fork, as the parent will
5699 do it before exiting. The child will trigger a lookup failure and
5700 thereby defer the delivery if it tries to use (for example) a cached ldap
5701 connection that the parent has called unbind on. */
5703 else if (!queue_only_policy && !deliver_freeze)
5708 if ((pid = fork()) == 0)
5711 close_unwanted(); /* Close unwanted file descriptors and TLS */
5712 exim_nullstd(); /* Ensure std{in,out,err} exist */
5714 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5715 mode, deliver_drop_privilege is forced TRUE). */
5717 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5719 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE,
5720 2, US"-Mc", message_id);
5721 /* Control does not return here. */
5724 /* No need to re-exec */
5726 rc = deliver_message(message_id, FALSE, FALSE);
5728 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5729 EXIT_SUCCESS : EXIT_FAILURE);
5734 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5735 "process: %s", strerror(errno));
5738 /* In the parent, wait if synchronous delivery is required. This will
5739 always be the case in MUA wrapper mode. */
5741 else if (synchronous_delivery)
5744 while (wait(&status) != pid);
5745 if ((status & 0x00ff) != 0)
5746 log_write(0, LOG_MAIN|LOG_PANIC,
5747 "process %d crashed with signal %d while delivering %s",
5748 (int)pid, status & 0x00ff, message_id);
5749 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5753 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5754 automatically reaps children (see comments above the loop), clear away any
5755 finished subprocesses here, in case there are lots of messages coming in
5756 from the same source. */
5758 #ifndef SIG_IGN_WORKS
5759 while (waitpid(-1, NULL, WNOHANG) > 0);
5763 exim_exit(EXIT_SUCCESS); /* Never returns */
5764 return 0; /* To stop compiler warning */