1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
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. */
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
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, nelem(ovector));
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 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
182 g = string_fmt_append(&gs, "%5d ", (int)getpid());
184 va_start(ap, format);
185 if (!string_vformat(g, FALSE, format, ap))
188 g = string_cat(&gs, US"**** string overflowed buffer ****");
190 g = string_catn(g, US"\n", 1);
191 string_from_gstring(g);
192 process_info_len = g->ptr;
193 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
197 /***********************************************
198 * Handler for SIGTERM *
199 ***********************************************/
202 term_handler(int sig)
208 /*************************************************
209 * Handler for SIGUSR1 *
210 *************************************************/
212 /* SIGUSR1 causes any exim process to write to the process log details of
213 what it is currently doing. It will only be used if the OS is capable of
214 setting up a handler that causes automatic restarting of any system call
215 that is in progress at the time.
217 This function takes care to be signal-safe.
219 Argument: the signal number (SIGUSR1)
224 usr1_handler(int sig)
228 os_restarting_signal(sig, usr1_handler);
230 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
232 /* If we are already running as the Exim user, try to create it in the
233 current process (assuming spool_directory exists). Otherwise, if we are
234 root, do the creation in an exim:exim subprocess. */
236 int euid = geteuid();
237 if (euid == exim_uid)
238 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
239 else if (euid == root_uid)
240 fd = log_create_as_exim(process_log_path);
243 /* If we are neither exim nor root, or if we failed to create the log file,
244 give up. There is not much useful we can do with errors, since we don't want
245 to disrupt whatever is going on outside the signal handler. */
249 (void)write(fd, process_info, process_info_len);
255 /*************************************************
257 *************************************************/
259 /* This handler is enabled most of the time that Exim is running. The handler
260 doesn't actually get used unless alarm() has been called to set a timer, to
261 place a time limit on a system call of some kind. When the handler is run, it
264 There are some other SIGALRM handlers that are used in special cases when more
265 than just a flag setting is required; for example, when reading a message's
266 input. These are normally set up in the code module that uses them, and the
267 SIGALRM handler is reset to this one afterwards.
269 Argument: the signal value (SIGALRM)
274 sigalrm_handler(int sig)
276 sig = sig; /* Keep picky compilers happy */
278 os_non_restarting_signal(SIGALRM, sigalrm_handler);
283 /*************************************************
284 * Sleep for a fractional time interval *
285 *************************************************/
287 /* This function is called by millisleep() and exim_wait_tick() to wait for a
288 period of time that may include a fraction of a second. The coding is somewhat
289 tedious. We do not expect setitimer() ever to fail, but if it does, the process
290 will wait for ever, so we panic in this instance. (There was a case of this
291 when a bug in a function that calls milliwait() caused it to pass invalid data.
292 That's when I added the check. :-)
294 We assume it to be not worth sleeping for under 100us; this value will
295 require revisiting as hardware advances. This avoids the issue of
296 a zero-valued timer setting meaning "never fire".
298 Argument: an itimerval structure containing the interval
303 milliwait(struct itimerval *itval)
306 sigset_t old_sigmask;
308 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
310 (void)sigemptyset(&sigmask); /* Empty mask */
311 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
312 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
313 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
314 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
315 "setitimer() failed: %s", strerror(errno));
316 (void)sigfillset(&sigmask); /* All signals */
317 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
318 (void)sigsuspend(&sigmask); /* Until SIGALRM */
319 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
325 /*************************************************
326 * Millisecond sleep function *
327 *************************************************/
329 /* The basic sleep() function has a granularity of 1 second, which is too rough
330 in some cases - for example, when using an increasing delay to slow down
333 Argument: number of millseconds
340 struct itimerval itval;
341 itval.it_interval.tv_sec = 0;
342 itval.it_interval.tv_usec = 0;
343 itval.it_value.tv_sec = msec/1000;
344 itval.it_value.tv_usec = (msec % 1000) * 1000;
350 /*************************************************
351 * Compare microsecond times *
352 *************************************************/
359 Returns: -1, 0, or +1
363 exim_tvcmp(struct timeval *t1, struct timeval *t2)
365 if (t1->tv_sec > t2->tv_sec) return +1;
366 if (t1->tv_sec < t2->tv_sec) return -1;
367 if (t1->tv_usec > t2->tv_usec) return +1;
368 if (t1->tv_usec < t2->tv_usec) return -1;
375 /*************************************************
376 * Clock tick wait function *
377 *************************************************/
379 /* Exim uses a time + a pid to generate a unique identifier in two places: its
380 message IDs, and in file names for maildir deliveries. Because some OS now
381 re-use pids within the same second, sub-second times are now being used.
382 However, for absolute certainty, we must ensure the clock has ticked before
383 allowing the relevant process to complete. At the time of implementation of
384 this code (February 2003), the speed of processors is such that the clock will
385 invariably have ticked already by the time a process has done its job. This
386 function prepares for the time when things are faster - and it also copes with
387 clocks that go backwards.
390 then_tv A timeval which was used to create uniqueness; its usec field
391 has been rounded down to the value of the resolution.
392 We want to be sure the current time is greater than this.
393 resolution The resolution that was used to divide the microseconds
394 (1 for maildir, larger for message ids)
400 exim_wait_tick(struct timeval *then_tv, int resolution)
402 struct timeval now_tv;
403 long int now_true_usec;
405 (void)gettimeofday(&now_tv, NULL);
406 now_true_usec = now_tv.tv_usec;
407 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
409 if (exim_tvcmp(&now_tv, then_tv) <= 0)
411 struct itimerval itval;
412 itval.it_interval.tv_sec = 0;
413 itval.it_interval.tv_usec = 0;
414 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
415 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
417 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
418 negative value for the microseconds is possible only in the case when "now"
419 is more than a second less than "then". That means that itval.it_value.tv_sec
420 is greater than zero. The following correction is therefore safe. */
422 if (itval.it_value.tv_usec < 0)
424 itval.it_value.tv_usec += 1000000;
425 itval.it_value.tv_sec -= 1;
428 DEBUG(D_transport|D_receive)
430 if (!f.running_in_test_harness)
432 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
433 then_tv->tv_sec, (long) then_tv->tv_usec,
434 now_tv.tv_sec, (long) now_tv.tv_usec);
435 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
436 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
447 /*************************************************
448 * Call fopen() with umask 777 and adjust mode *
449 *************************************************/
451 /* Exim runs with umask(0) so that files created with open() have the mode that
452 is specified in the open() call. However, there are some files, typically in
453 the spool directory, that are created with fopen(). They end up world-writeable
454 if no precautions are taken. Although the spool directory is not accessible to
455 the world, this is an untidiness. So this is a wrapper function for fopen()
456 that sorts out the mode of the created file.
459 filename the file name
460 options the fopen() options
461 mode the required mode
463 Returns: the fopened FILE or NULL
467 modefopen(const uschar *filename, const char *options, mode_t mode)
469 mode_t saved_umask = umask(0777);
470 FILE *f = Ufopen(filename, options);
471 (void)umask(saved_umask);
472 if (f != NULL) (void)fchmod(fileno(f), mode);
479 /*************************************************
480 * Ensure stdin, stdout, and stderr exist *
481 *************************************************/
483 /* Some operating systems grumble if an exec() happens without a standard
484 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
485 file will be opened and will use these fd values, and then some other bit of
486 code will assume, for example, that it can write error messages to stderr.
487 This function ensures that fds 0, 1, and 2 are open if they do not already
488 exist, by connecting them to /dev/null.
490 This function is also used to ensure that std{in,out,err} exist at all times,
491 so that if any library that Exim calls tries to use them, it doesn't crash.
503 for (i = 0; i <= 2; i++)
505 if (fstat(i, &statbuf) < 0 && errno == EBADF)
507 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
508 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
509 string_open_failed(errno, "/dev/null"));
510 if (devnull != i) (void)dup2(devnull, i);
513 if (devnull > 2) (void)close(devnull);
519 /*************************************************
520 * Close unwanted file descriptors for delivery *
521 *************************************************/
523 /* This function is called from a new process that has been forked to deliver
524 an incoming message, either directly, or using exec.
526 We want any smtp input streams to be closed in this new process. However, it
527 has been observed that using fclose() here causes trouble. When reading in -bS
528 input, duplicate copies of messages have been seen. The files will be sharing a
529 file pointer with the parent process, and it seems that fclose() (at least on
530 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
531 least sometimes. Hence we go for closing the underlying file descriptors.
533 If TLS is active, we want to shut down the TLS library, but without molesting
534 the parent's SSL connection.
536 For delivery of a non-SMTP message, we want to close stdin and stdout (and
537 stderr unless debugging) because the calling process might have set them up as
538 pipes and be waiting for them to close before it waits for the submission
539 process to terminate. If they aren't closed, they hold up the calling process
540 until the initial delivery process finishes, which is not what we want.
542 Exception: We do want it for synchronous delivery!
544 And notwithstanding all the above, if D_resolver is set, implying resolver
545 debugging, leave stdout open, because that's where the resolver writes its
548 When we close stderr (which implies we've also closed stdout), we also get rid
549 of any controlling terminal.
561 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
563 (void)close(fileno(smtp_in));
564 (void)close(fileno(smtp_out));
569 (void)close(0); /* stdin */
570 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
571 if (debug_selector == 0) /* stderr */
573 if (!f.synchronous_delivery)
586 /*************************************************
588 *************************************************/
590 /* This function sets a new uid and gid permanently, optionally calling
591 initgroups() to set auxiliary groups. There are some special cases when running
592 Exim in unprivileged modes. In these situations the effective uid will not be
593 root; if we already have the right effective uid/gid, and don't need to
594 initialize any groups, leave things as they are.
599 igflag TRUE if initgroups() wanted
600 msg text to use in debugging output and failure log
602 Returns: nothing; bombs out on failure
606 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
608 uid_t euid = geteuid();
609 gid_t egid = getegid();
611 if (euid == root_uid || euid != uid || egid != gid || igflag)
613 /* At least one OS returns +1 for initgroups failure, so just check for
618 struct passwd *pw = getpwuid(uid);
620 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
621 "no passwd entry for uid=%ld", (long int)uid);
623 if (initgroups(pw->pw_name, gid) != 0)
624 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
625 (long int)uid, strerror(errno));
628 if (setgid(gid) < 0 || setuid(uid) < 0)
629 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
630 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
633 /* Debugging output included uid/gid and all groups */
637 int group_count, save_errno;
638 gid_t group_list[EXIM_GROUPLIST_SIZE];
639 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
640 (long int)geteuid(), (long int)getegid(), (long int)getpid());
641 group_count = getgroups(nelem(group_list), group_list);
643 debug_printf(" auxiliary group list:");
647 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
649 else if (group_count < 0)
650 debug_printf(" <error: %s>", strerror(save_errno));
651 else debug_printf(" <none>");
659 /*************************************************
661 *************************************************/
663 /* Exim exits via this function so that it always clears up any open
669 Returns: does not return
673 exim_exit(int rc, const uschar * process)
677 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
678 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
679 process ? "(" : "", process, process ? ") " : "", rc);
685 /* Print error string, then die */
687 exim_fail(const char * fmt, ...)
691 vfprintf(stderr, fmt, ap);
697 /*************************************************
698 * Extract port from host address *
699 *************************************************/
701 /* Called to extract the port from the values given to -oMa and -oMi.
702 It also checks the syntax of the address, and terminates it before the
703 port data when a port is extracted.
706 address the address, with possible port on the end
708 Returns: the port, or zero if there isn't one
709 bombs out on a syntax error
713 check_port(uschar *address)
715 int port = host_address_extract_port(address);
716 if (string_is_ip_address(address, NULL) == 0)
717 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
723 /*************************************************
724 * Test/verify an address *
725 *************************************************/
727 /* This function is called by the -bv and -bt code. It extracts a working
728 address from a full RFC 822 address. This isn't really necessary per se, but it
729 has the effect of collapsing source routes.
733 flags flag bits for verify_address()
734 exit_value to be set for failures
740 test_address(uschar *s, int flags, int *exit_value)
742 int start, end, domain;
743 uschar *parse_error = NULL;
744 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
748 fprintf(stdout, "syntax error: %s\n", parse_error);
753 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
754 -1, -1, NULL, NULL, NULL);
755 if (rc == FAIL) *exit_value = 2;
756 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
762 /*************************************************
763 * Show supported features *
764 *************************************************/
767 show_db_version(FILE * f)
769 #ifdef DB_VERSION_STRING
772 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
773 fprintf(f, " Runtime: %s\n",
774 db_version(NULL, NULL, NULL));
777 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
779 #elif defined(BTREEVERSION) && defined(HASHVERSION)
781 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
783 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
786 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
787 fprintf(f, "Probably ndbm\n");
788 #elif defined(USE_TDB)
789 fprintf(f, "Using tdb\n");
792 fprintf(f, "Probably GDBM (native mode)\n");
794 fprintf(f, "Probably GDBM (compatibility mode)\n");
800 /* This function is called for -bV/--version and for -d to output the optional
801 features of the current Exim binary.
803 Arguments: a FILE for printing
808 show_whats_supported(FILE * fp)
812 DEBUG(D_any) {} else show_db_version(fp);
814 fprintf(fp, "Support for:");
815 #ifdef SUPPORT_CRYPTEQ
816 fprintf(fp, " crypteq");
819 fprintf(fp, " iconv()");
822 fprintf(fp, " IPv6");
824 #ifdef HAVE_SETCLASSRESOURCES
825 fprintf(fp, " use_setclassresources");
831 fprintf(fp, " Perl");
834 fprintf(fp, " Expand_dlfunc");
836 #ifdef USE_TCP_WRAPPERS
837 fprintf(fp, " TCPwrappers");
841 fprintf(fp, " GnuTLS");
843 fprintf(fp, " OpenSSL");
846 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
847 fprintf(fp, " translate_ip_address");
849 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
850 fprintf(fp, " move_frozen_messages");
852 #ifdef WITH_CONTENT_SCAN
853 fprintf(fp, " Content_Scanning");
856 fprintf(fp, " DANE");
859 fprintf(fp, " DKIM");
861 #ifndef DISABLE_DNSSEC
862 fprintf(fp, " DNSSEC");
864 #ifndef DISABLE_EVENT
865 fprintf(fp, " Event");
868 fprintf(fp, " I18N");
871 fprintf(fp, " OCSP");
874 fprintf(fp, " PRDR");
877 fprintf(fp, " PROXY");
880 fprintf(fp, " SOCKS");
887 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
889 #ifdef EXPERIMENTAL_LMDB
890 fprintf(fp, " Experimental_LMDB");
892 #ifdef EXPERIMENTAL_QUEUEFILE
893 fprintf(fp, " Experimental_QUEUEFILE");
895 #ifdef EXPERIMENTAL_SRS
896 fprintf(fp, " Experimental_SRS");
898 #ifdef EXPERIMENTAL_ARC
899 fprintf(fp, " Experimental_ARC");
901 #ifdef EXPERIMENTAL_BRIGHTMAIL
902 fprintf(fp, " Experimental_Brightmail");
904 #ifdef EXPERIMENTAL_DCC
905 fprintf(fp, " Experimental_DCC");
907 #ifdef EXPERIMENTAL_DMARC
908 fprintf(fp, " Experimental_DMARC");
910 #ifdef EXPERIMENTAL_DSN_INFO
911 fprintf(fp, " Experimental_DSN_info");
913 #ifdef EXPERIMENTAL_REQUIRETLS
914 fprintf(fp, " Experimental_REQUIRETLS");
916 #ifdef EXPERIMENTAL_PIPE_CONNECT
917 fprintf(fp, " Experimental_PIPE_CONNECT");
921 fprintf(fp, "Lookups (built-in):");
922 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
923 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
925 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
928 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
929 fprintf(fp, " dbm dbmjz dbmnz");
931 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
932 fprintf(fp, " dnsdb");
934 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
935 fprintf(fp, " dsearch");
937 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
938 fprintf(fp, " ibase");
940 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
941 fprintf(fp, " ldap ldapdn ldapm");
943 #ifdef EXPERIMENTAL_LMDB
944 fprintf(fp, " lmdb");
946 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
947 fprintf(fp, " mysql");
949 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
950 fprintf(fp, " nis nis0");
952 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
953 fprintf(fp, " nisplus");
955 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
956 fprintf(fp, " oracle");
958 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
959 fprintf(fp, " passwd");
961 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
962 fprintf(fp, " pgsql");
964 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
965 fprintf(fp, " redis");
967 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
968 fprintf(fp, " sqlite");
970 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
971 fprintf(fp, " testdb");
973 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
974 fprintf(fp, " whoson");
978 auth_show_supported(fp);
979 route_show_supported(fp);
980 transport_show_supported(fp);
982 #ifdef WITH_CONTENT_SCAN
983 malware_show_supported(fp);
986 if (fixed_never_users[0] > 0)
989 fprintf(fp, "Fixed never_users: ");
990 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
991 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
992 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
995 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
997 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
999 /* Everything else is details which are only worth reporting when debugging.
1000 Perhaps the tls_version_report should move into this too. */
1005 /* clang defines __GNUC__ (at least, for me) so test for it first */
1006 #if defined(__clang__)
1007 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1008 #elif defined(__GNUC__)
1009 fprintf(fp, "Compiler: GCC [%s]\n",
1013 "? unknown version ?"
1017 fprintf(fp, "Compiler: <unknown>\n");
1020 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1021 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1022 __GLIBC__, __GLIBC_MINOR__);
1023 if (__GLIBC_PREREQ(2, 1))
1024 fprintf(fp, " Runtime: %s\n",
1025 gnu_get_libc_version());
1028 show_db_version(fp);
1031 tls_version_report(fp);
1034 utf8_version_report(fp);
1037 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1038 if (authi->version_report)
1039 (*authi->version_report)(fp);
1041 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1042 characters; unless it's an ancient version of PCRE in which case it
1044 #ifndef PCRE_PRERELEASE
1045 # define PCRE_PRERELEASE
1048 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1049 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1051 PCRE_MAJOR, PCRE_MINOR,
1052 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1055 #undef EXPAND_AND_QUOTE
1058 for (i = 0; i < lookup_list_count; i++)
1059 if (lookup_list[i]->version_report)
1060 lookup_list[i]->version_report(fp);
1062 #ifdef WHITELIST_D_MACROS
1063 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1065 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1067 #ifdef TRUSTED_CONFIG_LIST
1068 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1070 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1077 /*************************************************
1078 * Show auxiliary information about Exim *
1079 *************************************************/
1082 show_exim_information(enum commandline_info request, FILE *stream)
1089 fprintf(stream, "Oops, something went wrong.\n");
1093 "The -bI: flag takes a string indicating which information to provide.\n"
1094 "If the string is not recognised, you'll get this help (on stderr).\n"
1096 " exim -bI:help this information\n"
1097 " exim -bI:dscp list of known dscp value keywords\n"
1098 " exim -bI:sieve list of supported sieve extensions\n"
1102 for (pp = exim_sieve_extension_list; *pp; ++pp)
1103 fprintf(stream, "%s\n", *pp);
1106 dscp_list_to_stream(stream);
1112 /*************************************************
1113 * Quote a local part *
1114 *************************************************/
1116 /* This function is used when a sender address or a From: or Sender: header
1117 line is being created from the caller's login, or from an authenticated_id. It
1118 applies appropriate quoting rules for a local part.
1120 Argument: the local part
1121 Returns: the local part, quoted if necessary
1125 local_part_quote(uschar *lpart)
1127 BOOL needs_quote = FALSE;
1131 for (t = lpart; !needs_quote && *t != 0; t++)
1133 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1134 (*t != '.' || t == lpart || t[1] == 0);
1137 if (!needs_quote) return lpart;
1139 g = string_catn(NULL, US"\"", 1);
1143 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1146 g = string_cat(g, lpart);
1149 g = string_catn(g, lpart, nq - lpart);
1150 g = string_catn(g, US"\\", 1);
1151 g = string_catn(g, nq, 1);
1155 g = string_catn(g, US"\"", 1);
1156 return string_from_gstring(g);
1162 /*************************************************
1163 * Load readline() functions *
1164 *************************************************/
1166 /* This function is called from testing executions that read data from stdin,
1167 but only when running as the calling user. Currently, only -be does this. The
1168 function loads the readline() function library and passes back the functions.
1169 On some systems, it needs the curses library, so load that too, but try without
1170 it if loading fails. All this functionality has to be requested at build time.
1173 fn_readline_ptr pointer to where to put the readline pointer
1174 fn_addhist_ptr pointer to where to put the addhistory function
1176 Returns: the dlopen handle or NULL on failure
1180 set_readline(char * (**fn_readline_ptr)(const char *),
1181 void (**fn_addhist_ptr)(const char *))
1184 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1186 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1187 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1189 if (dlhandle != NULL)
1191 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1192 * char * readline (const char *prompt);
1193 * void add_history (const char *string);
1195 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1196 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1200 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1209 /*************************************************
1210 * Get a line from stdin for testing things *
1211 *************************************************/
1213 /* This function is called when running tests that can take a number of lines
1214 of input (for example, -be and -bt). It handles continuations and trailing
1215 spaces. And prompting and a blank line output on eof. If readline() is in use,
1216 the arguments are non-NULL and provide the relevant functions.
1219 fn_readline readline function or NULL
1220 fn_addhist addhist function or NULL
1222 Returns: pointer to dynamic memory, or NULL at end of file
1226 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1231 if (!fn_readline) { printf("> "); fflush(stdout); }
1235 uschar buffer[1024];
1239 char *readline_line = NULL;
1240 if (fn_readline != NULL)
1242 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1243 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1244 p = US readline_line;
1249 /* readline() not in use */
1252 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1256 /* Handle the line */
1258 ss = p + (int)Ustrlen(p);
1259 while (ss > p && isspace(ss[-1])) ss--;
1263 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1266 g = string_catn(g, p, ss - p);
1269 if (fn_readline) free(readline_line);
1272 /* g can only be NULL if ss==p */
1273 if (ss == p || g->s[g->ptr-1] != '\\')
1277 (void) string_from_gstring(g);
1280 if (!g) printf("\n");
1281 return string_from_gstring(g);
1286 /*************************************************
1287 * Output usage information for the program *
1288 *************************************************/
1290 /* This function is called when there are no recipients
1291 or a specific --help argument was added.
1294 progname information on what name we were called by
1296 Returns: DOES NOT RETURN
1300 exim_usage(uschar *progname)
1303 /* Handle specific program invocation variants */
1304 if (Ustrcmp(progname, US"-mailq") == 0)
1306 "mailq - list the contents of the mail queue\n\n"
1307 "For a list of options, see the Exim documentation.\n");
1309 /* Generic usage - we output this whatever happens */
1311 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1312 "not directly from a shell command line. Options and/or arguments control\n"
1313 "what it does when called. For a list of options, see the Exim documentation.\n");
1318 /*************************************************
1319 * Validate that the macros given are okay *
1320 *************************************************/
1322 /* Typically, Exim will drop privileges if macros are supplied. In some
1323 cases, we want to not do so.
1325 Arguments: opt_D_used - true if the commandline had a "-D" option
1326 Returns: true if trusted, false otherwise
1330 macros_trusted(BOOL opt_D_used)
1332 #ifdef WHITELIST_D_MACROS
1334 uschar *whitelisted, *end, *p, **whites, **w;
1335 int white_count, i, n;
1337 BOOL prev_char_item, found;
1342 #ifndef WHITELIST_D_MACROS
1346 /* We only trust -D overrides for some invoking users:
1347 root, the exim run-time user, the optional config owner user.
1348 I don't know why config-owner would be needed, but since they can own the
1349 config files anyway, there's no security risk to letting them override -D. */
1350 if ( ! ((real_uid == root_uid)
1351 || (real_uid == exim_uid)
1352 #ifdef CONFIGURE_OWNER
1353 || (real_uid == config_uid)
1357 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1361 /* Get a list of macros which are whitelisted */
1362 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1363 prev_char_item = FALSE;
1365 for (p = whitelisted; *p != '\0'; ++p)
1367 if (*p == ':' || isspace(*p))
1372 prev_char_item = FALSE;
1375 if (!prev_char_item)
1376 prev_char_item = TRUE;
1383 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1384 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1389 if (i == white_count)
1391 while (*p != '\0' && p < end)
1397 /* The list of commandline macros should be very short.
1398 Accept the N*M complexity. */
1399 for (m = macros_user; m; m = m->next) if (m->command_line)
1402 for (w = whites; *w; ++w)
1403 if (Ustrcmp(*w, m->name) == 0)
1410 if (!m->replacement)
1412 if ((len = m->replen) == 0)
1414 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1415 0, PCRE_EOPT, NULL, 0);
1418 if (n != PCRE_ERROR_NOMATCH)
1419 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1423 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1429 /*************************************************
1430 * Expansion testing *
1431 *************************************************/
1433 /* Expand and print one item, doing macro-processing.
1436 item line for expansion
1440 expansion_test_line(uschar * line)
1445 Ustrncpy(big_buffer, line, big_buffer_size);
1446 big_buffer[big_buffer_size-1] = '\0';
1447 len = Ustrlen(big_buffer);
1449 (void) macros_expand(0, &len, &dummy_macexp);
1451 if (isupper(big_buffer[0]))
1453 if (macro_read_assignment(big_buffer))
1454 printf("Defined macro '%s'\n", mlast->name);
1457 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1458 else printf("Failed: %s\n", expand_string_message);
1463 /*************************************************
1464 * Entry point and high-level code *
1465 *************************************************/
1467 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1468 the appropriate action. All the necessary functions are present in the one
1469 binary. I originally thought one should split it up, but it turns out that so
1470 much of the apparatus is needed in each chunk that one might as well just have
1471 it all available all the time, which then makes the coding easier as well.
1474 argc count of entries in argv
1475 argv argument strings, with argv[0] being the program name
1477 Returns: EXIT_SUCCESS if terminated successfully
1478 EXIT_FAILURE otherwise, except when a message has been sent
1479 to the sender, and -oee was given
1483 main(int argc, char **cargv)
1485 uschar **argv = USS cargv;
1486 int arg_receive_timeout = -1;
1487 int arg_smtp_receive_timeout = -1;
1488 int arg_error_handling = error_handling;
1489 int filter_sfd = -1;
1490 int filter_ufd = -1;
1493 int list_queue_option = 0;
1495 int msg_action_arg = -1;
1496 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1497 int queue_only_reason = 0;
1499 int perl_start_option = 0;
1501 int recipients_arg = argc;
1502 int sender_address_domain = 0;
1503 int test_retry_arg = -1;
1504 int test_rewrite_arg = -1;
1505 gid_t original_egid;
1506 BOOL arg_queue_only = FALSE;
1507 BOOL bi_option = FALSE;
1508 BOOL checking = FALSE;
1509 BOOL count_queue = FALSE;
1510 BOOL expansion_test = FALSE;
1511 BOOL extract_recipients = FALSE;
1512 BOOL flag_G = FALSE;
1513 BOOL flag_n = FALSE;
1514 BOOL forced_delivery = FALSE;
1515 BOOL f_end_dot = FALSE;
1516 BOOL deliver_give_up = FALSE;
1517 BOOL list_queue = FALSE;
1518 BOOL list_options = FALSE;
1519 BOOL list_config = FALSE;
1520 BOOL local_queue_only;
1522 BOOL one_msg_action = FALSE;
1523 BOOL opt_D_used = FALSE;
1524 BOOL queue_only_set = FALSE;
1525 BOOL receiving_message = TRUE;
1526 BOOL sender_ident_set = FALSE;
1527 BOOL session_local_queue_only;
1529 BOOL removed_privilege = FALSE;
1530 BOOL usage_wanted = FALSE;
1531 BOOL verify_address_mode = FALSE;
1532 BOOL verify_as_sender = FALSE;
1533 BOOL version_printed = FALSE;
1534 uschar *alias_arg = NULL;
1535 uschar *called_as = US"";
1536 uschar *cmdline_syslog_name = NULL;
1537 uschar *start_queue_run_id = NULL;
1538 uschar *stop_queue_run_id = NULL;
1539 uschar *expansion_test_message = NULL;
1540 uschar *ftest_domain = NULL;
1541 uschar *ftest_localpart = NULL;
1542 uschar *ftest_prefix = NULL;
1543 uschar *ftest_suffix = NULL;
1544 uschar *log_oneline = NULL;
1545 uschar *malware_test_file = NULL;
1546 uschar *real_sender_address;
1547 uschar *originator_home = US"/";
1552 struct stat statbuf;
1553 pid_t passed_qr_pid = (pid_t)0;
1554 int passed_qr_pipe = -1;
1555 gid_t group_list[EXIM_GROUPLIST_SIZE];
1557 /* For the -bI: flag */
1558 enum commandline_info info_flag = CMDINFO_NONE;
1559 BOOL info_stdout = FALSE;
1561 /* Possible options for -R and -S */
1563 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1565 /* Need to define this in case we need to change the environment in order
1566 to get rid of a bogus time zone. We have to make it char rather than uschar
1567 because some OS define it in /usr/include/unistd.h. */
1569 extern char **environ;
1571 /* If the Exim user and/or group and/or the configuration file owner/group were
1572 defined by ref:name at build time, we must now find the actual uid/gid values.
1573 This is a feature to make the lives of binary distributors easier. */
1575 #ifdef EXIM_USERNAME
1576 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1579 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1581 /* If ref:name uses a number as the name, route_finduser() returns
1582 TRUE with exim_uid set and pw coerced to NULL. */
1584 exim_gid = pw->pw_gid;
1585 #ifndef EXIM_GROUPNAME
1588 "exim: ref:name should specify a usercode, not a group.\n"
1589 "exim: can't let you get away with it unless you also specify a group.\n");
1593 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1596 #ifdef EXIM_GROUPNAME
1597 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1598 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1601 #ifdef CONFIGURE_OWNERNAME
1602 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1603 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1604 CONFIGURE_OWNERNAME);
1607 /* We default the system_filter_user to be the Exim run-time user, as a
1608 sane non-root value. */
1609 system_filter_uid = exim_uid;
1611 #ifdef CONFIGURE_GROUPNAME
1612 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1613 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1614 CONFIGURE_GROUPNAME);
1617 /* In the Cygwin environment, some initialization used to need doing.
1618 It was fudged in by means of this macro; now no longer but we'll leave
1619 it in case of others. */
1625 /* Check a field which is patched when we are running Exim within its
1626 testing harness; do a fast initial check, and then the whole thing. */
1628 f.running_in_test_harness =
1629 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1630 if (f.running_in_test_harness)
1633 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1634 at the start of a program; however, it seems that some environments do not
1635 follow this. A "strange" locale can affect the formatting of timestamps, so we
1638 setlocale(LC_ALL, "C");
1640 /* Set up the default handler for timing using alarm(). */
1642 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1644 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1645 because store_malloc writes a log entry on failure. */
1647 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1648 exim_fail("exim: failed to get store for log buffer\n");
1650 /* Initialize the default log options. */
1652 bits_set(log_selector, log_selector_size, log_default);
1654 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1655 NULL when the daemon is run and the file is closed. We have to use this
1656 indirection, because some systems don't allow writing to the variable "stderr".
1659 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1661 /* Arrange for the PCRE regex library to use our store functions. Note that
1662 the normal calls are actually macros that add additional arguments for
1663 debugging purposes so we have to assign specially constructed functions here.
1664 The default is to use store in the stacking pool, but this is overridden in the
1665 regex_must_compile() function. */
1667 pcre_malloc = function_store_get;
1668 pcre_free = function_dummy_free;
1670 /* Ensure there is a big buffer for temporary use in several places. It is put
1671 in malloc store so that it can be freed for enlargement if necessary. */
1673 big_buffer = store_malloc(big_buffer_size);
1675 /* Set up the handler for the data request signal, and set the initial
1676 descriptive text. */
1678 set_process_info("initializing");
1679 os_restarting_signal(SIGUSR1, usr1_handler);
1681 /* If running in a dockerized environment, the TERM signal is only
1682 delegated to the PID 1 if we request it by setting an signal handler */
1683 if (getpid() == 1) signal(SIGTERM, term_handler);
1685 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1686 in the daemon code. For the rest of Exim's uses, we ignore it. */
1688 signal(SIGHUP, SIG_IGN);
1690 /* We don't want to die on pipe errors as the code is written to handle
1691 the write error instead. */
1693 signal(SIGPIPE, SIG_IGN);
1695 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1696 set to SIG_IGN. This causes subprocesses that complete before the parent
1697 process waits for them not to hang around, so when Exim calls wait(), nothing
1698 is there. The wait() code has been made robust against this, but let's ensure
1699 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1700 ending status. We use sigaction rather than plain signal() on those OS where
1701 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1702 problem on AIX with this.) */
1706 struct sigaction act;
1707 act.sa_handler = SIG_DFL;
1708 sigemptyset(&(act.sa_mask));
1710 sigaction(SIGCHLD, &act, NULL);
1713 signal(SIGCHLD, SIG_DFL);
1716 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1721 /* Set up the version number. Set up the leading 'E' for the external form of
1722 message ids, set the pointer to the internal form, and initialize it to
1723 indicate no message being processed. */
1726 message_id_option[0] = '-';
1727 message_id_external = message_id_option + 1;
1728 message_id_external[0] = 'E';
1729 message_id = message_id_external + 1;
1732 /* Set the umask to zero so that any files Exim creates using open() are
1733 created with the modes that it specifies. NOTE: Files created with fopen() have
1734 a problem, which was not recognized till rather late (February 2006). With this
1735 umask, such files will be world writeable. (They are all content scanning files
1736 in the spool directory, which isn't world-accessible, so this is not a
1737 disaster, but it's untidy.) I don't want to change this overall setting,
1738 however, because it will interact badly with the open() calls. Instead, there's
1739 now a function called modefopen() that fiddles with the umask while calling
1744 /* Precompile the regular expression for matching a message id. Keep this in
1745 step with the code that generates ids in the accept.c module. We need to do
1746 this here, because the -M options check their arguments for syntactic validity
1747 using mac_ismsgid, which uses this. */
1750 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1752 /* Precompile the regular expression that is used for matching an SMTP error
1753 code, possibly extended, at the start of an error message. Note that the
1754 terminating whitespace character is included. */
1757 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1760 #ifdef WHITELIST_D_MACROS
1761 /* Precompile the regular expression used to filter the content of macros
1762 given to -D for permissibility. */
1764 regex_whitelisted_macro =
1765 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1768 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1770 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1771 this seems to be a generally accepted convention, since one finds symbolic
1772 links called "mailq" in standard OS configurations. */
1774 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1775 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1778 receiving_message = FALSE;
1779 called_as = US"-mailq";
1782 /* If the program is called as "rmail" treat it as equivalent to
1783 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1784 i.e. preventing a single dot on a line from terminating the message, and
1785 returning with zero return code, even in cases of error (provided an error
1786 message has been sent). */
1788 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1789 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1792 called_as = US"-rmail";
1793 errors_sender_rc = EXIT_SUCCESS;
1796 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1797 this is a smail convention. */
1799 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1800 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1802 smtp_input = smtp_batched_input = TRUE;
1803 called_as = US"-rsmtp";
1806 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1807 this is a smail convention. */
1809 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1810 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1813 receiving_message = FALSE;
1814 called_as = US"-runq";
1817 /* If the program is called as "newaliases" treat it as equivalent to
1818 "exim -bi"; this is a sendmail convention. */
1820 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1821 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1824 receiving_message = FALSE;
1825 called_as = US"-newaliases";
1828 /* Save the original effective uid for a couple of uses later. It should
1829 normally be root, but in some esoteric environments it may not be. */
1831 original_euid = geteuid();
1832 original_egid = getegid();
1834 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1835 to be the same as the real ones. This makes a difference only if Exim is setuid
1836 (or setgid) to something other than root, which could be the case in some
1837 special configurations. */
1839 real_uid = getuid();
1840 real_gid = getgid();
1842 if (real_uid == root_uid)
1844 if ((rv = setgid(real_gid)))
1845 exim_fail("exim: setgid(%ld) failed: %s\n",
1846 (long int)real_gid, strerror(errno));
1847 if ((rv = setuid(real_uid)))
1848 exim_fail("exim: setuid(%ld) failed: %s\n",
1849 (long int)real_uid, strerror(errno));
1852 /* If neither the original real uid nor the original euid was root, Exim is
1853 running in an unprivileged state. */
1855 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1857 /* Scan the program's arguments. Some can be dealt with right away; others are
1858 simply recorded for checking and handling afterwards. Do a high-level switch
1859 on the second character (the one after '-'), to save some effort. */
1861 for (i = 1; i < argc; i++)
1863 BOOL badarg = FALSE;
1864 uschar *arg = argv[i];
1868 /* An argument not starting with '-' is the start of a recipients list;
1869 break out of the options-scanning loop. */
1877 /* An option consisting of -- terminates the options */
1879 if (Ustrcmp(arg, "--") == 0)
1881 recipients_arg = i + 1;
1885 /* Handle flagged options */
1887 switchchar = arg[1];
1890 /* Make all -ex options synonymous with -oex arguments, since that
1891 is assumed by various callers. Also make -qR options synonymous with -R
1892 options, as that seems to be required as well. Allow for -qqR too, and
1893 the same for -S options. */
1895 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1896 Ustrncmp(arg+1, "qR", 2) == 0 ||
1897 Ustrncmp(arg+1, "qS", 2) == 0)
1899 switchchar = arg[2];
1902 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1904 switchchar = arg[3];
1906 f.queue_2stage = TRUE;
1909 /* Make -r synonymous with -f, since it is a documented alias */
1911 else if (arg[1] == 'r') switchchar = 'f';
1913 /* Make -ov synonymous with -v */
1915 else if (Ustrcmp(arg, "-ov") == 0)
1921 /* deal with --option_aliases */
1922 else if (switchchar == '-')
1924 if (Ustrcmp(argrest, "help") == 0)
1926 usage_wanted = TRUE;
1929 else if (Ustrcmp(argrest, "version") == 0)
1936 /* High-level switch on active initial letter */
1941 /* sendmail uses -Ac and -Am to control which .cf file is used;
1944 if (*argrest == '\0') { badarg = TRUE; break; }
1947 BOOL ignore = FALSE;
1952 if (*(argrest + 1) == '\0')
1956 if (!ignore) { badarg = TRUE; break; }
1960 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1961 so has no need of it. */
1964 if (*argrest == 0) i++; /* Skip over the type */
1969 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1971 /* -bd: Run in daemon mode, awaiting SMTP connections.
1972 -bdf: Ditto, but in the foreground.
1975 if (*argrest == 'd')
1977 f.daemon_listen = TRUE;
1978 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1979 else if (*argrest != 0) { badarg = TRUE; break; }
1982 /* -be: Run in expansion test mode
1983 -bem: Ditto, but read a message from a file first
1986 else if (*argrest == 'e')
1988 expansion_test = checking = TRUE;
1989 if (argrest[1] == 'm')
1991 if (++i >= argc) { badarg = TRUE; break; }
1992 expansion_test_message = argv[i];
1995 if (argrest[1] != 0) { badarg = TRUE; break; }
1998 /* -bF: Run system filter test */
2000 else if (*argrest == 'F')
2002 filter_test |= checking = FTEST_SYSTEM;
2003 if (*(++argrest) != 0) { badarg = TRUE; break; }
2004 if (++i < argc) filter_test_sfile = argv[i]; else
2005 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2008 /* -bf: Run user filter test
2009 -bfd: Set domain for filter testing
2010 -bfl: Set local part for filter testing
2011 -bfp: Set prefix for filter testing
2012 -bfs: Set suffix for filter testing
2015 else if (*argrest == 'f')
2017 if (*(++argrest) == 0)
2019 filter_test |= checking = FTEST_USER;
2020 if (++i < argc) filter_test_ufile = argv[i]; else
2021 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2026 exim_fail("exim: string expected after %s\n", arg);
2027 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2028 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2029 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2030 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2031 else { badarg = TRUE; break; }
2035 /* -bh: Host checking - an IP address must follow. */
2037 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2039 if (++i >= argc) { badarg = TRUE; break; }
2040 sender_host_address = argv[i];
2041 host_checking = checking = f.log_testing_mode = TRUE;
2042 f.host_checking_callout = argrest[1] == 'c';
2043 message_logs = FALSE;
2046 /* -bi: This option is used by sendmail to initialize *the* alias file,
2047 though it has the -oA option to specify a different file. Exim has no
2048 concept of *the* alias file, but since Sun's YP make script calls
2049 sendmail this way, some support must be provided. */
2051 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2053 /* -bI: provide information, of the type to follow after a colon.
2054 This is an Exim flag. */
2056 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2058 uschar *p = &argrest[2];
2059 info_flag = CMDINFO_HELP;
2062 if (strcmpic(p, CUS"sieve") == 0)
2064 info_flag = CMDINFO_SIEVE;
2067 else if (strcmpic(p, CUS"dscp") == 0)
2069 info_flag = CMDINFO_DSCP;
2072 else if (strcmpic(p, CUS"help") == 0)
2079 /* -bm: Accept and deliver message - the default option. Reinstate
2080 receiving_message, which got turned off for all -b options. */
2082 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2084 /* -bmalware: test the filename given for malware */
2086 else if (Ustrcmp(argrest, "malware") == 0)
2088 if (++i >= argc) { badarg = TRUE; break; }
2090 malware_test_file = argv[i];
2093 /* -bnq: For locally originating messages, do not qualify unqualified
2094 addresses. In the envelope, this causes errors; in header lines they
2097 else if (Ustrcmp(argrest, "nq") == 0)
2099 f.allow_unqualified_sender = FALSE;
2100 f.allow_unqualified_recipient = FALSE;
2103 /* -bpxx: List the contents of the mail queue, in various forms. If
2104 the option is -bpc, just a queue count is needed. Otherwise, if the
2105 first letter after p is r, then order is random. */
2107 else if (*argrest == 'p')
2109 if (*(++argrest) == 'c')
2112 if (*(++argrest) != 0) badarg = TRUE;
2116 if (*argrest == 'r')
2118 list_queue_option = 8;
2121 else list_queue_option = 0;
2125 /* -bp: List the contents of the mail queue, top-level only */
2127 if (*argrest == 0) {}
2129 /* -bpu: List the contents of the mail queue, top-level undelivered */
2131 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2133 /* -bpa: List the contents of the mail queue, including all delivered */
2135 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2137 /* Unknown after -bp[r] */
2147 /* -bP: List the configuration variables given as the address list.
2148 Force -v, so configuration errors get displayed. */
2150 else if (Ustrcmp(argrest, "P") == 0)
2152 /* -bP config: we need to setup here, because later,
2153 * when list_options is checked, the config is read already */
2154 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2157 readconf_save_config(version_string);
2161 list_options = TRUE;
2162 debug_selector |= D_v;
2163 debug_file = stderr;
2167 /* -brt: Test retry configuration lookup */
2169 else if (Ustrcmp(argrest, "rt") == 0)
2172 test_retry_arg = i + 1;
2176 /* -brw: Test rewrite configuration */
2178 else if (Ustrcmp(argrest, "rw") == 0)
2181 test_rewrite_arg = i + 1;
2185 /* -bS: Read SMTP commands on standard input, but produce no replies -
2186 all errors are reported by sending messages. */
2188 else if (Ustrcmp(argrest, "S") == 0)
2189 smtp_input = smtp_batched_input = receiving_message = TRUE;
2191 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2192 on standard output. */
2194 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2196 /* -bt: address testing mode */
2198 else if (Ustrcmp(argrest, "t") == 0)
2199 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2201 /* -bv: verify addresses */
2203 else if (Ustrcmp(argrest, "v") == 0)
2204 verify_address_mode = checking = f.log_testing_mode = TRUE;
2206 /* -bvs: verify sender addresses */
2208 else if (Ustrcmp(argrest, "vs") == 0)
2210 verify_address_mode = checking = f.log_testing_mode = TRUE;
2211 verify_as_sender = TRUE;
2214 /* -bV: Print version string and support details */
2216 else if (Ustrcmp(argrest, "V") == 0)
2218 printf("Exim version %s #%s built %s\n", version_string,
2219 version_cnumber, version_date);
2220 printf("%s\n", CS version_copyright);
2221 version_printed = TRUE;
2222 show_whats_supported(stdout);
2223 f.log_testing_mode = TRUE;
2226 /* -bw: inetd wait mode, accept a listening socket as stdin */
2228 else if (*argrest == 'w')
2230 f.inetd_wait_mode = TRUE;
2231 f.background_daemon = FALSE;
2232 f.daemon_listen = TRUE;
2233 if (*(++argrest) != '\0')
2234 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2235 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2242 /* -C: change configuration file list; ignore if it isn't really
2243 a change! Enforce a prefix check if required. */
2248 if(++i < argc) argrest = argv[i]; else
2249 { badarg = TRUE; break; }
2251 if (Ustrcmp(config_main_filelist, argrest) != 0)
2253 #ifdef ALT_CONFIG_PREFIX
2255 int len = Ustrlen(ALT_CONFIG_PREFIX);
2256 const uschar *list = argrest;
2258 while((filename = string_nextinlist(&list, &sep, big_buffer,
2259 big_buffer_size)) != NULL)
2261 if ((Ustrlen(filename) < len ||
2262 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2263 Ustrstr(filename, "/../") != NULL) &&
2264 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2265 exim_fail("-C Permission denied\n");
2268 if (real_uid != root_uid)
2270 #ifdef TRUSTED_CONFIG_LIST
2272 if (real_uid != exim_uid
2273 #ifdef CONFIGURE_OWNER
2274 && real_uid != config_uid
2277 f.trusted_config = FALSE;
2280 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2283 struct stat statbuf;
2285 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2286 (statbuf.st_uid != root_uid /* owner not root */
2287 #ifdef CONFIGURE_OWNER
2288 && statbuf.st_uid != config_uid /* owner not the special one */
2291 (statbuf.st_gid != root_gid /* group not root */
2292 #ifdef CONFIGURE_GROUP
2293 && statbuf.st_gid != config_gid /* group not the special one */
2295 && (statbuf.st_mode & 020) != 0 /* group writeable */
2297 (statbuf.st_mode & 2) != 0) /* world writeable */
2299 f.trusted_config = FALSE;
2304 /* Well, the trust list at least is up to scratch... */
2305 void *reset_point = store_get(0);
2306 uschar *trusted_configs[32];
2310 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2312 uschar *start = big_buffer, *nl;
2313 while (*start && isspace(*start))
2317 nl = Ustrchr(start, '\n');
2320 trusted_configs[nr_configs++] = string_copy(start);
2321 if (nr_configs == 32)
2329 const uschar *list = argrest;
2331 while (f.trusted_config && (filename = string_nextinlist(&list,
2332 &sep, big_buffer, big_buffer_size)) != NULL)
2334 for (i=0; i < nr_configs; i++)
2336 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2339 if (i == nr_configs)
2341 f.trusted_config = FALSE;
2345 store_reset(reset_point);
2349 /* No valid prefixes found in trust_list file. */
2350 f.trusted_config = FALSE;
2356 /* Could not open trust_list file. */
2357 f.trusted_config = FALSE;
2361 /* Not root; don't trust config */
2362 f.trusted_config = FALSE;
2366 config_main_filelist = argrest;
2367 f.config_changed = TRUE;
2372 /* -D: set up a macro definition */
2375 #ifdef DISABLE_D_OPTION
2376 exim_fail("exim: -D is not available in this Exim binary\n");
2382 uschar *s = argrest;
2385 while (isspace(*s)) s++;
2387 if (*s < 'A' || *s > 'Z')
2388 exim_fail("exim: macro name set by -D must start with "
2389 "an upper case letter\n");
2391 while (isalnum(*s) || *s == '_')
2393 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2397 if (ptr == 0) { badarg = TRUE; break; }
2398 while (isspace(*s)) s++;
2401 if (*s++ != '=') { badarg = TRUE; break; }
2402 while (isspace(*s)) s++;
2405 for (m = macros_user; m; m = m->next)
2406 if (Ustrcmp(m->name, name) == 0)
2407 exim_fail("exim: duplicated -D in command line\n");
2409 m = macro_create(name, s, TRUE);
2411 if (clmacro_count >= MAX_CLMACROS)
2412 exim_fail("exim: too many -D options on command line\n");
2413 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2419 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2420 The latter is now a no-op, retained for compatibility only. If -dd is used,
2421 debugging subprocesses of the daemon is disabled. */
2424 if (Ustrcmp(argrest, "ropcr") == 0)
2426 /* drop_cr = TRUE; */
2429 /* Use an intermediate variable so that we don't set debugging while
2430 decoding the debugging bits. */
2434 unsigned int selector = D_default;
2437 if (*argrest == 'd')
2439 f.debug_daemon = TRUE;
2443 decode_bits(&selector, 1, debug_notall, argrest,
2444 debug_options, debug_options_count, US"debug", 0);
2445 debug_selector = selector;
2450 /* -E: This is a local error message. This option is not intended for
2451 external use at all, but is not restricted to trusted callers because it
2452 does no harm (just suppresses certain error messages) and if Exim is run
2453 not setuid root it won't always be trusted when it generates error
2454 messages using this option. If there is a message id following -E, point
2455 message_reference at it, for logging. */
2458 f.local_error_message = TRUE;
2459 if (mac_ismsgid(argrest)) message_reference = argrest;
2463 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2464 option, so it looks as if historically the -oex options are also callable
2465 without the leading -o. So we have to accept them. Before the switch,
2466 anything starting -oe has been converted to -e. Exim does not support all
2467 of the sendmail error options. */
2470 if (Ustrcmp(argrest, "e") == 0)
2472 arg_error_handling = ERRORS_SENDER;
2473 errors_sender_rc = EXIT_SUCCESS;
2475 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2476 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2477 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2478 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2483 /* -F: Set sender's full name, used instead of the gecos entry from
2484 the password file. Since users can usually alter their gecos entries,
2485 there's no security involved in using this instead. The data can follow
2486 the -F or be in the next argument. */
2491 if(++i < argc) argrest = argv[i]; else
2492 { badarg = TRUE; break; }
2494 originator_name = argrest;
2495 f.sender_name_forced = TRUE;
2499 /* -f: Set sender's address - this value is only actually used if Exim is
2500 run by a trusted user, or if untrusted_set_sender is set and matches the
2501 address, except that the null address can always be set by any user. The
2502 test for this happens later, when the value given here is ignored when not
2503 permitted. For an untrusted user, the actual sender is still put in Sender:
2504 if it doesn't match the From: header (unless no_local_from_check is set).
2505 The data can follow the -f or be in the next argument. The -r switch is an
2506 obsolete form of -f but since there appear to be programs out there that
2507 use anything that sendmail has ever supported, better accept it - the
2508 synonymizing is done before the switch above.
2510 At this stage, we must allow domain literal addresses, because we don't
2511 know what the setting of allow_domain_literals is yet. Ditto for trailing
2512 dots and strip_trailing_dot. */
2516 int dummy_start, dummy_end;
2520 if (i+1 < argc) argrest = argv[++i]; else
2521 { badarg = TRUE; break; }
2524 sender_address = string_sprintf(""); /* Ensure writeable memory */
2527 uschar *temp = argrest + Ustrlen(argrest) - 1;
2528 while (temp >= argrest && isspace(*temp)) temp--;
2529 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2530 allow_domain_literals = TRUE;
2531 strip_trailing_dot = TRUE;
2533 allow_utf8_domains = TRUE;
2535 sender_address = parse_extract_address(argrest, &errmess,
2536 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2538 message_smtputf8 = string_is_utf8(sender_address);
2539 allow_utf8_domains = FALSE;
2541 allow_domain_literals = FALSE;
2542 strip_trailing_dot = FALSE;
2543 if (!sender_address)
2544 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2546 f.sender_address_forced = TRUE;
2550 /* -G: sendmail invocation to specify that it's a gateway submission and
2551 sendmail may complain about problems instead of fixing them.
2552 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2553 not at this time complain about problems. */
2559 /* -h: Set the hop count for an incoming message. Exim does not currently
2560 support this; it always computes it by counting the Received: headers.
2561 To put it in will require a change to the spool header file format. */
2566 if(++i < argc) argrest = argv[i]; else
2567 { badarg = TRUE; break; }
2569 if (!isdigit(*argrest)) badarg = TRUE;
2573 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2574 not to be documented for sendmail but mailx (at least) uses it) */
2577 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2581 /* -L: set the identifier used for syslog; equivalent to setting
2582 syslog_processname in the config file, but needs to be an admin option. */
2585 if (*argrest == '\0')
2587 if(++i < argc) argrest = argv[i]; else
2588 { badarg = TRUE; break; }
2590 if ((sz = Ustrlen(argrest)) > 32)
2591 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2593 exim_fail("exim: the -L syslog name is too short\n");
2594 cmdline_syslog_name = argrest;
2598 receiving_message = FALSE;
2600 /* -MC: continue delivery of another message via an existing open
2601 file descriptor. This option is used for an internal call by the
2602 smtp transport when there is a pending message waiting to go to an
2603 address to which it has got a connection. Five subsequent arguments are
2604 required: transport name, host name, IP address, sequence number, and
2605 message_id. Transports may decline to create new processes if the sequence
2606 number gets too big. The channel is stdin. This (-MC) must be the last
2607 argument. There's a subsequent check that the real-uid is privileged.
2609 If we are running in the test harness. delay for a bit, to let the process
2610 that set this one up complete. This makes for repeatability of the logging,
2613 if (Ustrcmp(argrest, "C") == 0)
2615 union sockaddr_46 interface_sock;
2616 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2619 exim_fail("exim: too many or too few arguments after -MC\n");
2621 if (msg_action_arg >= 0)
2622 exim_fail("exim: incompatible arguments\n");
2624 continue_transport = argv[++i];
2625 continue_hostname = argv[++i];
2626 continue_host_address = argv[++i];
2627 continue_sequence = Uatoi(argv[++i]);
2628 msg_action = MSG_DELIVER;
2629 msg_action_arg = ++i;
2630 forced_delivery = TRUE;
2631 queue_run_pid = passed_qr_pid;
2632 queue_run_pipe = passed_qr_pipe;
2634 if (!mac_ismsgid(argv[i]))
2635 exim_fail("exim: malformed message id %s after -MC option\n",
2638 /* Set up $sending_ip_address and $sending_port, unless proxied */
2640 if (!continue_proxy_cipher)
2641 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2643 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2646 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2649 if (f.running_in_test_harness) millisleep(500);
2653 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2657 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2658 precedes -MC (see above). The flag indicates that the host to which
2659 Exim is connected has accepted an AUTH sequence. */
2661 case 'A': f.smtp_authenticated = TRUE; break;
2663 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2664 that exim is connected to supports the esmtp extension DSN */
2666 case 'D': smtp_peer_options |= OPTION_DSN; break;
2668 /* -MCG: set the queue name, to a non-default value */
2670 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2674 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2676 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2678 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2679 it preceded -MC (see above) */
2681 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2683 /* -MCQ: pass on the pid of the queue-running process that started
2684 this chain of deliveries and the fd of its synchronizing pipe; this
2685 is useful only when it precedes -MC (see above) */
2687 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2689 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2693 /* -MCS: set the smtp_use_size flag; this is useful only when it
2694 precedes -MC (see above) */
2696 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2699 /* -MCt: similar to -MCT below but the connection is still open
2700 via a proxy process which handles the TLS context and coding.
2701 Require three arguments for the proxied local address and port,
2702 and the TLS cipher. */
2704 case 't': if (++i < argc) sending_ip_address = argv[i];
2706 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2708 if (++i < argc) continue_proxy_cipher = argv[i];
2712 /* -MCT: set the tls_offered flag; this is useful only when it
2713 precedes -MC (see above). The flag indicates that the host to which
2714 Exim is connected has offered TLS support. */
2716 case 'T': smtp_peer_options |= OPTION_TLS; break;
2719 default: badarg = TRUE; break;
2724 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2725 /* -MS set REQUIRETLS on (new) message */
2727 else if (*argrest == 'S')
2729 tls_requiretls |= REQUIRETLS_MSG;
2734 /* -M[x]: various operations on the following list of message ids:
2735 -M deliver the messages, ignoring next retry times and thawing
2736 -Mc deliver the messages, checking next retry times, no thawing
2737 -Mf freeze the messages
2738 -Mg give up on the messages
2739 -Mt thaw the messages
2740 -Mrm remove the messages
2741 In the above cases, this must be the last option. There are also the
2742 following options which are followed by a single message id, and which
2743 act on that message. Some of them use the "recipient" addresses as well.
2744 -Mar add recipient(s)
2745 -Mmad mark all recipients delivered
2746 -Mmd mark recipients(s) delivered
2748 -Mset load a message for use with -be
2750 -Mvc show copy (of whole message, in RFC 2822 format)
2755 else if (*argrest == 0)
2757 msg_action = MSG_DELIVER;
2758 forced_delivery = f.deliver_force_thaw = TRUE;
2760 else if (Ustrcmp(argrest, "ar") == 0)
2762 msg_action = MSG_ADD_RECIPIENT;
2763 one_msg_action = TRUE;
2765 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2766 else if (Ustrcmp(argrest, "es") == 0)
2768 msg_action = MSG_EDIT_SENDER;
2769 one_msg_action = TRUE;
2771 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2772 else if (Ustrcmp(argrest, "g") == 0)
2774 msg_action = MSG_DELIVER;
2775 deliver_give_up = TRUE;
2777 else if (Ustrcmp(argrest, "mad") == 0)
2779 msg_action = MSG_MARK_ALL_DELIVERED;
2781 else if (Ustrcmp(argrest, "md") == 0)
2783 msg_action = MSG_MARK_DELIVERED;
2784 one_msg_action = TRUE;
2786 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2787 else if (Ustrcmp(argrest, "set") == 0)
2789 msg_action = MSG_LOAD;
2790 one_msg_action = TRUE;
2792 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2793 else if (Ustrcmp(argrest, "vb") == 0)
2795 msg_action = MSG_SHOW_BODY;
2796 one_msg_action = TRUE;
2798 else if (Ustrcmp(argrest, "vc") == 0)
2800 msg_action = MSG_SHOW_COPY;
2801 one_msg_action = TRUE;
2803 else if (Ustrcmp(argrest, "vh") == 0)
2805 msg_action = MSG_SHOW_HEADER;
2806 one_msg_action = TRUE;
2808 else if (Ustrcmp(argrest, "vl") == 0)
2810 msg_action = MSG_SHOW_LOG;
2811 one_msg_action = TRUE;
2813 else { badarg = TRUE; break; }
2815 /* All the -Mxx options require at least one message id. */
2817 msg_action_arg = i + 1;
2818 if (msg_action_arg >= argc)
2819 exim_fail("exim: no message ids given after %s option\n", arg);
2821 /* Some require only message ids to follow */
2823 if (!one_msg_action)
2826 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2827 exim_fail("exim: malformed message id %s after %s option\n",
2829 goto END_ARG; /* Remaining args are ids */
2832 /* Others require only one message id, possibly followed by addresses,
2833 which will be handled as normal arguments. */
2837 if (!mac_ismsgid(argv[msg_action_arg]))
2838 exim_fail("exim: malformed message id %s after %s option\n",
2839 argv[msg_action_arg], arg);
2845 /* Some programs seem to call the -om option without the leading o;
2846 for sendmail it askes for "me too". Exim always does this. */
2849 if (*argrest != 0) badarg = TRUE;
2853 /* -N: don't do delivery - a debugging option that stops transports doing
2854 their thing. It implies debugging at the D_v level. */
2859 f.dont_deliver = TRUE;
2860 debug_selector |= D_v;
2861 debug_file = stderr;
2867 /* -n: This means "don't alias" in sendmail, apparently.
2868 For normal invocations, it has no effect.
2869 It may affect some other options. */
2875 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2876 option to the specified value. This form uses long names. We need to handle
2877 -O option=value and -Ooption=value. */
2883 exim_fail("exim: string expected after -O\n");
2889 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2892 if (*argrest == 'A')
2894 alias_arg = argrest + 1;
2895 if (alias_arg[0] == 0)
2897 if (i+1 < argc) alias_arg = argv[++i]; else
2898 exim_fail("exim: string expected after -oA\n");
2902 /* -oB: Set a connection message max value for remote deliveries */
2904 else if (*argrest == 'B')
2906 uschar *p = argrest + 1;
2909 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2911 connection_max_messages = 1;
2919 exim_fail("exim: number expected after -oB\n");
2920 connection_max_messages = Uatoi(p);
2924 /* -odb: background delivery */
2926 else if (Ustrcmp(argrest, "db") == 0)
2928 f.synchronous_delivery = FALSE;
2929 arg_queue_only = FALSE;
2930 queue_only_set = TRUE;
2933 /* -odf: foreground delivery (smail-compatible option); same effect as
2934 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2937 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2939 f.synchronous_delivery = TRUE;
2940 arg_queue_only = FALSE;
2941 queue_only_set = TRUE;
2944 /* -odq: queue only */
2946 else if (Ustrcmp(argrest, "dq") == 0)
2948 f.synchronous_delivery = FALSE;
2949 arg_queue_only = TRUE;
2950 queue_only_set = TRUE;
2953 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2954 but no remote delivery */
2956 else if (Ustrcmp(argrest, "dqs") == 0)
2958 f.queue_smtp = TRUE;
2959 arg_queue_only = FALSE;
2960 queue_only_set = TRUE;
2963 /* -oex: Sendmail error flags. As these are also accepted without the
2964 leading -o prefix, for compatibility with vacation and other callers,
2965 they are handled with -e above. */
2967 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2968 -oitrue: Another sendmail syntax for the same */
2970 else if (Ustrcmp(argrest, "i") == 0 ||
2971 Ustrcmp(argrest, "itrue") == 0)
2974 /* -oM*: Set various characteristics for an incoming message; actually
2975 acted on for trusted callers only. */
2977 else if (*argrest == 'M')
2980 exim_fail("exim: data expected after -o%s\n", argrest);
2982 /* -oMa: Set sender host address */
2984 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2986 /* -oMaa: Set authenticator name */
2988 else if (Ustrcmp(argrest, "Maa") == 0)
2989 sender_host_authenticated = argv[++i];
2991 /* -oMas: setting authenticated sender */
2993 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2995 /* -oMai: setting authenticated id */
2997 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2999 /* -oMi: Set incoming interface address */
3001 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3003 /* -oMm: Message reference */
3005 else if (Ustrcmp(argrest, "Mm") == 0)
3007 if (!mac_ismsgid(argv[i+1]))
3008 exim_fail("-oMm must be a valid message ID\n");
3009 if (!f.trusted_config)
3010 exim_fail("-oMm must be called by a trusted user/config\n");
3011 message_reference = argv[++i];
3014 /* -oMr: Received protocol */
3016 else if (Ustrcmp(argrest, "Mr") == 0)
3018 if (received_protocol)
3019 exim_fail("received_protocol is set already\n");
3021 received_protocol = argv[++i];
3023 /* -oMs: Set sender host name */
3025 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3027 /* -oMt: Set sender ident */
3029 else if (Ustrcmp(argrest, "Mt") == 0)
3031 sender_ident_set = TRUE;
3032 sender_ident = argv[++i];
3035 /* Else a bad argument */
3044 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3045 seem to call this as -m (undocumented), so that is also accepted (see
3048 else if (Ustrcmp(argrest, "m") == 0) {}
3050 /* -oo: An ancient flag for old-style addresses which still seems to
3051 crop up in some calls (see in SCO). */
3053 else if (Ustrcmp(argrest, "o") == 0) {}
3055 /* -oP <name>: set pid file path for daemon */
3057 else if (Ustrcmp(argrest, "P") == 0)
3058 override_pid_file_path = argv[++i];
3060 /* -or <n>: set timeout for non-SMTP acceptance
3061 -os <n>: set timeout for SMTP acceptance */
3063 else if (*argrest == 'r' || *argrest == 's')
3065 int *tp = (*argrest == 'r')?
3066 &arg_receive_timeout : &arg_smtp_receive_timeout;
3067 if (argrest[1] == 0)
3069 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3071 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3073 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3076 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3078 else if (Ustrcmp(argrest, "X") == 0)
3079 override_local_interfaces = argv[++i];
3081 /* Unknown -o argument */
3087 /* -ps: force Perl startup; -pd force delayed Perl startup */
3091 if (*argrest == 's' && argrest[1] == 0)
3093 perl_start_option = 1;
3096 if (*argrest == 'd' && argrest[1] == 0)
3098 perl_start_option = -1;
3103 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3104 which sets the host protocol and host name */
3108 argrest = argv[++i];
3110 { badarg = TRUE; break; }
3116 if (received_protocol)
3117 exim_fail("received_protocol is set already\n");
3119 hn = Ustrchr(argrest, ':');
3121 received_protocol = argrest;
3124 int old_pool = store_pool;
3125 store_pool = POOL_PERM;
3126 received_protocol = string_copyn(argrest, hn - argrest);
3127 store_pool = old_pool;
3128 sender_host_name = hn + 1;
3135 receiving_message = FALSE;
3136 if (queue_interval >= 0)
3137 exim_fail("exim: -q specified more than once\n");
3139 /* -qq...: Do queue runs in a 2-stage manner */
3141 if (*argrest == 'q')
3143 f.queue_2stage = TRUE;
3147 /* -qi...: Do only first (initial) deliveries */
3149 if (*argrest == 'i')
3151 f.queue_run_first_delivery = TRUE;
3155 /* -qf...: Run the queue, forcing deliveries
3156 -qff..: Ditto, forcing thawing as well */
3158 if (*argrest == 'f')
3160 f.queue_run_force = TRUE;
3161 if (*++argrest == 'f')
3163 f.deliver_force_thaw = TRUE;
3168 /* -q[f][f]l...: Run the queue only on local deliveries */
3170 if (*argrest == 'l')
3172 f.queue_run_local = TRUE;
3176 /* -q[f][f][l][G<name>]... Work on the named queue */
3178 if (*argrest == 'G')
3181 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3182 queue_name = string_copyn(argrest, i);
3184 if (*argrest == '/') argrest++;
3187 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3188 only, optionally named, optionally starting from a given message id. */
3190 if (!(list_queue || count_queue))
3192 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3195 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3196 start_queue_run_id = argv[++i];
3197 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3198 stop_queue_run_id = argv[++i];
3201 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3202 forced, optionally local only, optionally named. */
3204 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3206 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3210 case 'R': /* Synonymous with -qR... */
3211 receiving_message = FALSE;
3213 /* -Rf: As -R (below) but force all deliveries,
3214 -Rff: Ditto, but also thaw all frozen messages,
3215 -Rr: String is regex
3216 -Rrf: Regex and force
3217 -Rrff: Regex and force and thaw
3219 in all cases provided there are no further characters in this
3225 for (i = 0; i < nelem(rsopts); i++)
3226 if (Ustrcmp(argrest, rsopts[i]) == 0)
3228 if (i != 2) f.queue_run_force = TRUE;
3229 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3230 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3231 argrest += Ustrlen(rsopts[i]);
3235 /* -R: Set string to match in addresses for forced queue run to
3236 pick out particular messages. */
3239 deliver_selectstring = argrest;
3240 else if (i+1 < argc)
3241 deliver_selectstring = argv[++i];
3243 exim_fail("exim: string expected after -R\n");
3247 /* -r: an obsolete synonym for -f (see above) */
3250 /* -S: Like -R but works on sender. */
3252 case 'S': /* Synonymous with -qS... */
3253 receiving_message = FALSE;
3255 /* -Sf: As -S (below) but force all deliveries,
3256 -Sff: Ditto, but also thaw all frozen messages,
3257 -Sr: String is regex
3258 -Srf: Regex and force
3259 -Srff: Regex and force and thaw
3261 in all cases provided there are no further characters in this
3267 for (i = 0; i < nelem(rsopts); i++)
3268 if (Ustrcmp(argrest, rsopts[i]) == 0)
3270 if (i != 2) f.queue_run_force = TRUE;
3271 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3272 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3273 argrest += Ustrlen(rsopts[i]);
3277 /* -S: Set string to match in addresses for forced queue run to
3278 pick out particular messages. */
3281 deliver_selectstring_sender = argrest;
3282 else if (i+1 < argc)
3283 deliver_selectstring_sender = argv[++i];
3285 exim_fail("exim: string expected after -S\n");
3288 /* -Tqt is an option that is exclusively for use by the testing suite.
3289 It is not recognized in other circumstances. It allows for the setting up
3290 of explicit "queue times" so that various warning/retry things can be
3291 tested. Otherwise variability of clock ticks etc. cause problems. */
3294 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3295 fudged_queue_times = argv[++i];
3300 /* -t: Set flag to extract recipients from body of message. */
3303 if (*argrest == 0) extract_recipients = TRUE;
3305 /* -ti: Set flag to extract recipients from body of message, and also
3306 specify that dot does not end the message. */
3308 else if (Ustrcmp(argrest, "i") == 0)
3310 extract_recipients = TRUE;
3314 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3317 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3324 /* -U: This means "initial user submission" in sendmail, apparently. The
3325 doc claims that in future sendmail may refuse syntactically invalid
3326 messages instead of fixing them. For the moment, we just ignore it. */
3332 /* -v: verify things - this is a very low-level debugging */
3337 debug_selector |= D_v;
3338 debug_file = stderr;
3344 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3346 The -x flag tells the sendmail command that mail from a local
3347 mail program has National Language Support (NLS) extended characters
3348 in the body of the mail item. The sendmail command can send mail with
3349 extended NLS characters across networks that normally corrupts these
3352 As Exim is 8-bit clean, it just ignores this flag. */
3355 if (*argrest != 0) badarg = TRUE;
3358 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3359 logs to that file. We swallow the parameter and otherwise ignore it. */
3362 if (*argrest == '\0')
3364 exim_fail("exim: string expected after -X\n");
3368 if (*argrest == '\0')
3370 log_oneline = argv[i];
3372 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3375 /* All other initial characters are errors */
3380 } /* End of high-level switch statement */
3382 /* Failed to recognize the option, or syntax error */
3385 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3386 "option %s\n", arg);
3390 /* If -R or -S have been specified without -q, assume a single queue run. */
3392 if ( (deliver_selectstring || deliver_selectstring_sender)
3393 && queue_interval < 0)
3398 /* If usage_wanted is set we call the usage function - which never returns */
3399 if (usage_wanted) exim_usage(called_as);
3401 /* Arguments have been processed. Check for incompatibilities. */
3403 (smtp_input || extract_recipients || recipients_arg < argc) &&
3404 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3405 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3406 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3409 msg_action_arg > 0 &&
3410 (f.daemon_listen || queue_interval > 0 || list_options ||
3411 (checking && msg_action != MSG_LOAD) ||
3412 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3415 (f.daemon_listen || queue_interval > 0) &&
3416 (sender_address != NULL || list_options || list_queue || checking ||
3420 f.daemon_listen && queue_interval == 0
3423 f.inetd_wait_mode && queue_interval >= 0
3427 (checking || smtp_input || extract_recipients ||
3428 filter_test != FTEST_NONE || bi_option)
3431 verify_address_mode &&
3432 (f.address_test_mode || smtp_input || extract_recipients ||
3433 filter_test != FTEST_NONE || bi_option)
3436 f.address_test_mode && (smtp_input || extract_recipients ||
3437 filter_test != FTEST_NONE || bi_option)
3440 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3444 deliver_selectstring != NULL && queue_interval < 0
3447 msg_action == MSG_LOAD &&
3448 (!expansion_test || expansion_test_message != NULL)
3451 exim_fail("exim: incompatible command-line options or arguments\n");
3453 /* If debugging is set up, set the file and the file descriptor to pass on to
3454 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3455 to run in the foreground. */
3457 if (debug_selector != 0)
3459 debug_file = stderr;
3460 debug_fd = fileno(debug_file);
3461 f.background_daemon = FALSE;
3462 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3463 if (debug_selector != D_v) /* -v only doesn't show this */
3465 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3466 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3468 if (!version_printed)
3469 show_whats_supported(stderr);
3473 /* When started with root privilege, ensure that the limits on the number of
3474 open files and the number of processes (where that is accessible) are
3475 sufficiently large, or are unset, in case Exim has been called from an
3476 environment where the limits are screwed down. Not all OS have the ability to
3477 change some of these limits. */
3481 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3487 #ifdef RLIMIT_NOFILE
3488 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3490 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3492 rlp.rlim_cur = rlp.rlim_max = 0;
3495 /* I originally chose 1000 as a nice big number that was unlikely to
3496 be exceeded. It turns out that some older OS have a fixed upper limit of
3499 if (rlp.rlim_cur < 1000)
3501 rlp.rlim_cur = rlp.rlim_max = 1000;
3502 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3504 rlp.rlim_cur = rlp.rlim_max = 256;
3505 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3506 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3513 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3515 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3517 rlp.rlim_cur = rlp.rlim_max = 0;
3520 #ifdef RLIM_INFINITY
3521 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3523 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3525 if (rlp.rlim_cur < 1000)
3527 rlp.rlim_cur = rlp.rlim_max = 1000;
3529 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3530 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3536 /* Exim is normally entered as root (but some special configurations are
3537 possible that don't do this). However, it always spins off sub-processes that
3538 set their uid and gid as required for local delivery. We don't want to pass on
3539 any extra groups that root may belong to, so we want to get rid of them all at
3542 We need to obey setgroups() at this stage, before possibly giving up root
3543 privilege for a changed configuration file, but later on we might need to
3544 check on the additional groups for the admin user privilege - can't do that
3545 till after reading the config, which might specify the exim gid. Therefore,
3546 save the group list here first. */
3548 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3549 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3551 /* There is a fundamental difference in some BSD systems in the matter of
3552 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3553 known not to be different. On the "different" systems there is a single group
3554 list, and the first entry in it is the current group. On all other versions of
3555 Unix there is a supplementary group list, which is in *addition* to the current
3556 group. Consequently, to get rid of all extraneous groups on a "standard" system
3557 you pass over 0 groups to setgroups(), while on a "different" system you pass
3558 over a single group - the current group, which is always the first group in the
3559 list. Calling setgroups() with zero groups on a "different" system results in
3560 an error return. The following code should cope with both types of system.
3562 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3563 the "setgroups() with zero groups" - and changes the egid.
3564 Thanks to that we had to stash the original_egid above, for use below
3565 in the call to exim_setugid().
3567 However, if this process isn't running as root, setgroups() can't be used
3568 since you have to be root to run it, even if throwing away groups. Not being
3569 root here happens only in some unusual configurations. We just ignore the
3572 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3573 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3575 /* If the configuration file name has been altered by an argument on the
3576 command line (either a new file name or a macro definition) and the caller is
3577 not root, or if this is a filter testing run, remove any setuid privilege the
3578 program has and run as the underlying user.
3580 The exim user is locked out of this, which severely restricts the use of -C
3583 Otherwise, set the real ids to the effective values (should be root unless run
3584 from inetd, which it can either be root or the exim uid, if one is configured).
3586 There is a private mechanism for bypassing some of this, in order to make it
3587 possible to test lots of configurations automatically, without having either to
3588 recompile each time, or to patch in an actual configuration file name and other
3589 values (such as the path name). If running in the test harness, pretend that
3590 configuration file changes and macro definitions haven't happened. */
3593 (!f.trusted_config || /* Config changed, or */
3594 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3595 real_uid != root_uid && /* Not root, and */
3596 !f.running_in_test_harness /* Not fudged */
3598 expansion_test /* expansion testing */
3600 filter_test != FTEST_NONE) /* Filter testing */
3602 setgroups(group_count, group_list);
3603 exim_setugid(real_uid, real_gid, FALSE,
3604 US"-C, -D, -be or -bf forces real uid");
3605 removed_privilege = TRUE;
3607 /* In the normal case when Exim is called like this, stderr is available
3608 and should be used for any logging information because attempts to write
3609 to the log will usually fail. To arrange this, we unset really_exim. However,
3610 if no stderr is available there is no point - we might as well have a go
3611 at the log (if it fails, syslog will be written).
3613 Note that if the invoker is Exim, the logs remain available. Messing with
3614 this causes unlogged successful deliveries. */
3616 if (log_stderr && real_uid != exim_uid)
3617 f.really_exim = FALSE;
3620 /* Privilege is to be retained for the moment. It may be dropped later,
3621 depending on the job that this Exim process has been asked to do. For now, set
3622 the real uid to the effective so that subsequent re-execs of Exim are done by a
3626 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3628 /* If testing a filter, open the file(s) now, before wasting time doing other
3629 setups and reading the message. */
3631 if (filter_test & FTEST_SYSTEM)
3632 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3633 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3636 if (filter_test & FTEST_USER)
3637 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3638 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3641 /* Initialise lookup_list
3642 If debugging, already called above via version reporting.
3643 In either case, we initialise the list of available lookups while running
3644 as root. All dynamically modules are loaded from a directory which is
3645 hard-coded into the binary and is code which, if not a module, would be
3646 part of Exim already. Ability to modify the content of the directory
3647 is equivalent to the ability to modify a setuid binary!
3649 This needs to happen before we read the main configuration. */
3653 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3656 /* Read the main runtime configuration data; this gives up if there
3657 is a failure. It leaves the configuration file open so that the subsequent
3658 configuration data for delivery can be read if needed.
3660 NOTE: immediately after opening the configuration file we change the working
3661 directory to "/"! Later we change to $spool_directory. We do it there, because
3662 during readconf_main() some expansion takes place already. */
3664 /* Store the initial cwd before we change directories. Can be NULL if the
3665 dir has already been unlinked. */
3666 initial_cwd = os_getcwd(NULL, 0);
3669 -be[m] expansion test -
3670 -b[fF] filter test new
3672 -bmalware malware_test_file new
3674 -brw rewrite test new
3676 -bv[s] address verify -
3678 -bP <option> (except -bP config, which sets list_config)
3680 If any of these options is set, we suppress warnings about configuration
3681 issues (currently about tls_advertise_hosts and keep_environment not being
3684 readconf_main(checking || list_options);
3687 /* Now in directory "/" */
3689 if (cleanup_environment() == FALSE)
3690 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3693 /* If an action on specific messages is requested, or if a daemon or queue
3694 runner is being started, we need to know if Exim was called by an admin user.
3695 This is the case if the real user is root or exim, or if the real group is
3696 exim, or if one of the supplementary groups is exim or a group listed in
3697 admin_groups. We don't fail all message actions immediately if not admin_user,
3698 since some actions can be performed by non-admin users. Instead, set admin_user
3699 for later interrogation. */
3701 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3702 f.admin_user = TRUE;
3706 for (i = 0; i < group_count && !f.admin_user; i++)
3707 if (group_list[i] == exim_gid)
3708 f.admin_user = TRUE;
3709 else if (admin_groups)
3710 for (j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3711 if (admin_groups[j] == group_list[i])
3712 f.admin_user = TRUE;
3715 /* Another group of privileged users are the trusted users. These are root,
3716 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3717 are permitted to specify sender_addresses with -f on the command line, and
3718 other message parameters as well. */
3720 if (real_uid == root_uid || real_uid == exim_uid)
3721 f.trusted_caller = TRUE;
3727 for (i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3728 if (trusted_users[i] == real_uid)
3729 f.trusted_caller = TRUE;
3732 for (i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3733 if (trusted_groups[i] == real_gid)
3734 f.trusted_caller = TRUE;
3735 else for (j = 0; j < group_count && !f.trusted_caller; j++)
3736 if (trusted_groups[i] == group_list[j])
3737 f.trusted_caller = TRUE;
3740 /* At this point, we know if the user is privileged and some command-line
3741 options become possibly impermissible, depending upon the configuration file. */
3743 if (checking && commandline_checks_require_admin && !f.admin_user)
3744 exim_fail("exim: those command-line flags are set to require admin\n");
3746 /* Handle the decoding of logging options. */
3748 decode_bits(log_selector, log_selector_size, log_notall,
3749 log_selector_string, log_options, log_options_count, US"log", 0);
3754 debug_printf("configuration file is %s\n", config_main_filename);
3755 debug_printf("log selectors =");
3756 for (i = 0; i < log_selector_size; i++)
3757 debug_printf(" %08x", log_selector[i]);
3761 /* If domain literals are not allowed, check the sender address that was
3762 supplied with -f. Ditto for a stripped trailing dot. */
3766 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3767 exim_fail("exim: bad -f address \"%s\": domain literals not "
3768 "allowed\n", sender_address);
3769 if (f_end_dot && !strip_trailing_dot)
3770 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3771 "(trailing dot not allowed)\n", sender_address);
3774 /* See if an admin user overrode our logging. */
3776 if (cmdline_syslog_name)
3779 syslog_processname = cmdline_syslog_name;
3780 log_file_path = string_copy(CUS"syslog");
3783 /* not a panic, non-privileged users should not be able to spam paniclog */
3785 "exim: you lack sufficient privilege to specify syslog process name\n");
3787 /* Paranoia check of maximum lengths of certain strings. There is a check
3788 on the length of the log file path in log.c, which will come into effect
3789 if there are any calls to write the log earlier than this. However, if we
3790 get this far but the string is very long, it is better to stop now than to
3791 carry on and (e.g.) receive a message and then have to collapse. The call to
3792 log_write() from here will cause the ultimate panic collapse if the complete
3793 file name exceeds the buffer length. */
3795 if (Ustrlen(log_file_path) > 200)
3796 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3797 "log_file_path is longer than 200 chars: aborting");
3799 if (Ustrlen(pid_file_path) > 200)
3800 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3801 "pid_file_path is longer than 200 chars: aborting");
3803 if (Ustrlen(spool_directory) > 200)
3804 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3805 "spool_directory is longer than 200 chars: aborting");
3807 /* Length check on the process name given to syslog for its TAG field,
3808 which is only permitted to be 32 characters or less. See RFC 3164. */
3810 if (Ustrlen(syslog_processname) > 32)
3811 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3812 "syslog_processname is longer than 32 chars: aborting");
3817 log_write(0, LOG_MAIN, "%s", log_oneline);
3818 return EXIT_SUCCESS;
3821 return EXIT_FAILURE;
3823 /* In some operating systems, the environment variable TMPDIR controls where
3824 temporary files are created; Exim doesn't use these (apart from when delivering
3825 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3826 If TMPDIR is found in the environment, reset it to the value defined in the
3827 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3828 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3829 EXIM_TMPDIR by the build scripts.
3835 if (environ) for (p = USS environ; *p; p++)
3836 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3838 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3839 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3841 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3846 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3847 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3848 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3849 called by a user who has set the TZ variable. This then affects the timestamps
3850 in log files and in Received: headers, and any created Date: header lines. The
3851 required timezone is settable in the configuration file, so nothing can be done
3852 about this earlier - but hopefully nothing will normally be logged earlier than
3853 this. We have to make a new environment if TZ is wrong, but don't bother if
3854 timestamps_utc is set, because then all times are in UTC anyway. */
3856 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3857 f.timestamps_utc = TRUE;
3860 uschar *envtz = US getenv("TZ");
3862 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3863 : timezone_string != NULL
3866 uschar **p = USS environ;
3870 if (environ) while (*p++) count++;
3871 if (!envtz) count++;
3872 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3873 if (environ) for (p = USS environ; *p; p++)
3874 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3875 if (timezone_string)
3877 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3878 sprintf(CS *newp++, "TZ=%s", timezone_string);
3883 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3884 tod_stamp(tod_log));
3888 /* Handle the case when we have removed the setuid privilege because of -C or
3889 -D. This means that the caller of Exim was not root.
3891 There is a problem if we were running as the Exim user. The sysadmin may
3892 expect this case to retain privilege because "the binary was called by the
3893 Exim user", but it hasn't, because either the -D option set macros, or the
3894 -C option set a non-trusted configuration file. There are two possibilities:
3896 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3897 to do message deliveries. Thus, the fact that it is running as a
3898 non-privileged user is plausible, and might be wanted in some special
3899 configurations. However, really_exim will have been set false when
3900 privilege was dropped, to stop Exim trying to write to its normal log
3901 files. Therefore, re-enable normal log processing, assuming the sysadmin
3902 has set up the log directory correctly.
3904 (2) If deliver_drop_privilege is not set, the configuration won't work as
3905 apparently intended, and so we log a panic message. In order to retain
3906 root for -C or -D, the caller must either be root or be invoking a
3907 trusted configuration file (when deliver_drop_privilege is false). */
3909 if ( removed_privilege
3910 && (!f.trusted_config || opt_D_used)
3911 && real_uid == exim_uid)
3912 if (deliver_drop_privilege)
3913 f.really_exim = TRUE; /* let logging work normally */
3915 log_write(0, LOG_MAIN|LOG_PANIC,
3916 "exim user lost privilege for using %s option",
3917 f.trusted_config? "-D" : "-C");
3919 /* Start up Perl interpreter if Perl support is configured and there is a
3920 perl_startup option, and the configuration or the command line specifies
3921 initializing starting. Note that the global variables are actually called
3922 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3925 if (perl_start_option != 0)
3926 opt_perl_at_start = (perl_start_option > 0);
3927 if (opt_perl_at_start && opt_perl_startup != NULL)
3930 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3931 if ((errstr = init_perl(opt_perl_startup)))
3932 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3933 opt_perl_started = TRUE;
3935 #endif /* EXIM_PERL */
3937 /* Log the arguments of the call if the configuration file said so. This is
3938 a debugging feature for finding out what arguments certain MUAs actually use.
3939 Don't attempt it if logging is disabled, or if listing variables or if
3940 verifying/testing addresses or expansions. */
3942 if ( (debug_selector & D_any || LOGGING(arguments))
3943 && f.really_exim && !list_options && !checking)
3946 uschar *p = big_buffer;
3947 Ustrcpy(p, "cwd= (failed)");
3953 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3954 p += 4 + Ustrlen(initial_cwd);
3955 /* in case p is near the end and we don't provide enough space for
3956 * string_format to be willing to write. */
3960 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3962 for (i = 0; i < argc; i++)
3964 int len = Ustrlen(argv[i]);
3965 const uschar *printing;
3967 if (p + len + 8 >= big_buffer + big_buffer_size)
3970 log_write(0, LOG_MAIN, "%s", big_buffer);
3971 Ustrcpy(big_buffer, "...");
3974 printing = string_printing(argv[i]);
3975 if (printing[0] == 0) quote = US"\""; else
3977 const uschar *pp = printing;
3979 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3981 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3982 (p - big_buffer) - 4), printing, quote);
3985 if (LOGGING(arguments))
3986 log_write(0, LOG_MAIN, "%s", big_buffer);
3988 debug_printf("%s\n", big_buffer);
3991 /* Set the working directory to be the top-level spool directory. We don't rely
3992 on this in the code, which always uses fully qualified names, but it's useful
3993 for core dumps etc. Don't complain if it fails - the spool directory might not
3994 be generally accessible and calls with the -C option (and others) have lost
3995 privilege by now. Before the chdir, we try to ensure that the directory exists.
3998 if (Uchdir(spool_directory) != 0)
4001 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4002 dummy = /* quieten compiler */ Uchdir(spool_directory);
4003 dummy = dummy; /* yet more compiler quietening, sigh */
4006 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4007 alias file. Exim doesn't have such a concept, but this call is screwed into
4008 Sun's YP makefiles. Handle this by calling a configured script, as the real
4009 user who called Exim. The -oA option can be used to pass an argument to the
4014 (void)fclose(config_file);
4015 if (bi_command != NULL)
4019 argv[i++] = bi_command;
4020 if (alias_arg != NULL) argv[i++] = alias_arg;
4023 setgroups(group_count, group_list);
4024 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4026 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4027 (argv[1] == NULL)? US"" : argv[1]);
4029 execv(CS argv[0], (char *const *)argv);
4030 exim_fail("exim: exec failed: %s\n", strerror(errno));
4034 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4039 /* We moved the admin/trusted check to be immediately after reading the
4040 configuration file. We leave these prints here to ensure that syslog setup,
4041 logfile setup, and so on has already happened. */
4043 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4044 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4046 /* Only an admin user may start the daemon or force a queue run in the default
4047 configuration, but the queue run restriction can be relaxed. Only an admin
4048 user may request that a message be returned to its sender forthwith. Only an
4049 admin user may specify a debug level greater than D_v (because it might show
4050 passwords, etc. in lookup queries). Only an admin user may request a queue
4051 count. Only an admin user can use the test interface to scan for email
4052 (because Exim will be in the spool dir and able to look at mails). */
4056 BOOL debugset = (debug_selector & ~D_v) != 0;
4057 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4058 (count_queue && queue_list_requires_admin) ||
4059 (list_queue && queue_list_requires_admin) ||
4060 (queue_interval >= 0 && prod_requires_admin) ||
4061 (debugset && !f.running_in_test_harness))
4062 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4065 /* If the real user is not root or the exim uid, the argument for passing
4066 in an open TCP/IP connection for another message is not permitted, nor is
4067 running with the -N option for any delivery action, unless this call to exim is
4068 one that supplied an input message, or we are using a patched exim for
4069 regression testing. */
4071 if (real_uid != root_uid && real_uid != exim_uid &&
4072 (continue_hostname != NULL ||
4074 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4075 )) && !f.running_in_test_harness)
4076 exim_fail("exim: Permission denied\n");
4078 /* If the caller is not trusted, certain arguments are ignored when running for
4079 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4080 Note that authority for performing certain actions on messages is tested in the
4081 queue_action() function. */
4083 if (!f.trusted_caller && !checking)
4085 sender_host_name = sender_host_address = interface_address =
4086 sender_ident = received_protocol = NULL;
4087 sender_host_port = interface_port = 0;
4088 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4091 /* If a sender host address is set, extract the optional port number off the
4092 end of it and check its syntax. Do the same thing for the interface address.
4093 Exim exits if the syntax is bad. */
4097 if (sender_host_address != NULL)
4098 sender_host_port = check_port(sender_host_address);
4099 if (interface_address != NULL)
4100 interface_port = check_port(interface_address);
4103 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4106 if (f.trusted_caller)
4108 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4109 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4112 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4115 /* If an SMTP message is being received check to see if the standard input is a
4116 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4117 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4122 union sockaddr_46 inetd_sock;
4123 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4124 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4126 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4127 if (family == AF_INET || family == AF_INET6)
4129 union sockaddr_46 interface_sock;
4130 size = sizeof(interface_sock);
4132 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4133 interface_address = host_ntoa(-1, &interface_sock, NULL,
4136 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4138 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4141 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4142 NULL, &sender_host_port);
4143 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4144 "inetd is not supported when mua_wrapper is set");
4148 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4153 /* If the load average is going to be needed while receiving a message, get it
4154 now for those OS that require the first call to os_getloadavg() to be done as
4155 root. There will be further calls later for each message received. */
4157 #ifdef LOAD_AVG_NEEDS_ROOT
4158 if (receiving_message &&
4159 (queue_only_load >= 0 ||
4160 (f.is_inetd && smtp_load_reserve >= 0)
4163 load_average = OS_GETLOADAVG();
4167 /* The queue_only configuration option can be overridden by -odx on the command
4168 line, except that if queue_only_override is false, queue_only cannot be unset
4169 from the command line. */
4171 if (queue_only_set && (queue_only_override || arg_queue_only))
4172 queue_only = arg_queue_only;
4174 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4177 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4178 if (arg_smtp_receive_timeout >= 0)
4179 smtp_receive_timeout = arg_smtp_receive_timeout;
4181 /* If Exim was started with root privilege, unless we have already removed the
4182 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4183 except when starting the daemon or doing some kind of delivery or address
4184 testing (-bt). These are the only cases when root need to be retained. We run
4185 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4186 retained only for starting the daemon. We always do the initgroups() in this
4187 situation (controlled by the TRUE below), in order to be as close as possible
4188 to the state Exim usually runs in. */
4190 if (!unprivileged && /* originally had root AND */
4191 !removed_privilege && /* still got root AND */
4192 !f.daemon_listen && /* not starting the daemon */
4193 queue_interval <= 0 && /* (either kind of daemon) */
4195 deliver_drop_privilege || /* requested unprivileged */
4197 queue_interval < 0 && /* not running the queue */
4198 (msg_action_arg < 0 || /* and */
4199 msg_action != MSG_DELIVER) && /* not delivering and */
4200 (!checking || !f.address_test_mode) /* not address checking */
4202 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4204 /* When we are retaining a privileged uid, we still change to the exim gid. */
4209 rv = setgid(exim_gid);
4210 /* Impact of failure is that some stuff might end up with an incorrect group.
4211 We track this for failures from root, since any attempt to change privilege
4212 by root should succeed and failures should be examined. For non-root,
4213 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4214 no need to complain then. */
4216 if (!(unprivileged || removed_privilege))
4217 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4219 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4220 (long int)exim_gid, strerror(errno));
4223 /* Handle a request to scan a file for malware */
4224 if (malware_test_file)
4226 #ifdef WITH_CONTENT_SCAN
4228 set_process_info("scanning file for malware");
4229 result = malware_in_file(malware_test_file);
4232 printf("No malware found.\n");
4237 printf("Malware lookup returned non-okay/fail: %d\n", result);
4241 printf("Malware found: %s\n", malware_name);
4243 printf("Malware scan detected malware of unknown name.\n");
4245 printf("Malware scanning not enabled at compile time.\n");
4250 /* Handle a request to list the delivery queue */
4254 set_process_info("listing the queue");
4255 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4259 /* Handle a request to count the delivery queue */
4263 set_process_info("counting the queue");
4268 /* Handle actions on specific messages, except for the force delivery and
4269 message load actions, which are done below. Some actions take a whole list of
4270 message ids, which are known to continue up to the end of the arguments. Others
4271 take a single message id and then operate on the recipients list. */
4273 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4275 int yield = EXIT_SUCCESS;
4276 set_process_info("acting on specified messages");
4278 /* ACL definitions may be needed when removing a message (-Mrm) because
4279 event_action gets expanded */
4281 if (msg_action == MSG_REMOVE)
4284 if (!one_msg_action)
4286 for (i = msg_action_arg; i < argc; i++)
4287 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4288 yield = EXIT_FAILURE;
4291 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4292 recipients_arg)) yield = EXIT_FAILURE;
4296 /* We used to set up here to skip reading the ACL section, on
4297 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4298 Now, since the intro of the ${acl } expansion, ACL definitions may be
4299 needed in transports so we lost the optimisation. */
4303 /* The configuration data will have been read into POOL_PERM because we won't
4304 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4305 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4306 configuration were read into POOL_MAIN, because we don't do any resets till
4307 later on. However, it seems right, and it does ensure that both pools get used.
4310 store_pool = POOL_MAIN;
4312 /* Handle the -brt option. This is for checking out retry configurations.
4313 The next three arguments are a domain name or a complete address, and
4314 optionally two error numbers. All it does is to call the function that
4315 scans the retry configuration data. */
4317 if (test_retry_arg >= 0)
4319 retry_config *yield;
4320 int basic_errno = 0;
4324 if (test_retry_arg >= argc)
4326 printf("-brt needs a domain or address argument\n");
4327 exim_exit(EXIT_FAILURE, US"main");
4329 s1 = argv[test_retry_arg++];
4332 /* If the first argument contains no @ and no . it might be a local user
4333 or it might be a single-component name. Treat as a domain. */
4335 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4337 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4338 "being \ntreated as a one-component domain, not as a local part.\n\n",
4342 /* There may be an optional second domain arg. */
4344 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4345 s2 = argv[test_retry_arg++];
4347 /* The final arg is an error name */
4349 if (test_retry_arg < argc)
4351 uschar *ss = argv[test_retry_arg];
4353 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4356 printf("%s\n", CS error);
4357 return EXIT_FAILURE;
4360 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4361 code > 100 as an error is for matching codes to the decade. Turn them into
4362 a real error code, off the decade. */
4364 if (basic_errno == ERRNO_MAIL4XX ||
4365 basic_errno == ERRNO_RCPT4XX ||
4366 basic_errno == ERRNO_DATA4XX)
4368 int code = (more_errno >> 8) & 255;
4370 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4371 else if (code > 100)
4372 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4376 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4377 printf("No retry information found\n");
4381 more_errno = yield->more_errno;
4382 printf("Retry rule: %s ", yield->pattern);
4384 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4386 printf("quota%s%s ",
4387 (more_errno > 0)? "_" : "",
4388 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4390 else if (yield->basic_errno == ECONNREFUSED)
4392 printf("refused%s%s ",
4393 (more_errno > 0)? "_" : "",
4394 (more_errno == 'M')? "MX" :
4395 (more_errno == 'A')? "A" : "");
4397 else if (yield->basic_errno == ETIMEDOUT)
4400 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4402 if (more_errno != 0) printf("_%s",
4403 (more_errno == 'M')? "MX" : "A");
4406 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4407 printf("auth_failed ");
4410 for (r = yield->rules; r; r = r->next)
4412 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4413 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4419 printf(",%d.", x/1000);
4433 exim_exit(EXIT_SUCCESS, US"main");
4436 /* Handle a request to list one or more configuration options */
4437 /* If -n was set, we suppress some information */
4442 set_process_info("listing variables");
4443 if (recipients_arg >= argc)
4444 fail = !readconf_print(US"all", NULL, flag_n);
4445 else for (i = recipients_arg; i < argc; i++)
4448 (Ustrcmp(argv[i], "router") == 0 ||
4449 Ustrcmp(argv[i], "transport") == 0 ||
4450 Ustrcmp(argv[i], "authenticator") == 0 ||
4451 Ustrcmp(argv[i], "macro") == 0 ||
4452 Ustrcmp(argv[i], "environment") == 0))
4454 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4458 fail = !readconf_print(argv[i], NULL, flag_n);
4460 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4465 set_process_info("listing config");
4466 exim_exit(readconf_print(US"config", NULL, flag_n)
4467 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4471 /* Initialise subsystems as required */
4472 #ifndef DISABLE_DKIM
4478 /* Handle a request to deliver one or more messages that are already on the
4479 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4480 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4482 Delivery of specific messages is typically used for a small number when
4483 prodding by hand (when the option forced_delivery will be set) or when
4484 re-execing to regain root privilege. Each message delivery must happen in a
4485 separate process, so we fork a process for each one, and run them sequentially
4486 so that debugging output doesn't get intertwined, and to avoid spawning too
4487 many processes if a long list is given. However, don't fork for the last one;
4488 this saves a process in the common case when Exim is called to deliver just one
4491 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4493 if (prod_requires_admin && !f.admin_user)
4495 fprintf(stderr, "exim: Permission denied\n");
4496 exim_exit(EXIT_FAILURE, US"main");
4498 set_process_info("delivering specified messages");
4499 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4500 for (i = msg_action_arg; i < argc; i++)
4505 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4506 else if ((pid = fork()) == 0)
4508 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4509 _exit(EXIT_SUCCESS);
4513 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4515 exim_exit(EXIT_FAILURE, US"main");
4519 exim_exit(EXIT_SUCCESS, US"main");
4523 /* If only a single queue run is requested, without SMTP listening, we can just
4524 turn into a queue runner, with an optional starting message id. */
4526 if (queue_interval == 0 && !f.daemon_listen)
4528 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4529 (start_queue_run_id == NULL)? US"" : US" starting at ",
4530 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4531 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4532 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4534 set_process_info("running the '%s' queue (single queue run)", queue_name);
4536 set_process_info("running the queue (single queue run)");
4537 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4538 exim_exit(EXIT_SUCCESS, US"main");
4542 /* Find the login name of the real user running this process. This is always
4543 needed when receiving a message, because it is written into the spool file. It
4544 may also be used to construct a from: or a sender: header, and in this case we
4545 need the user's full name as well, so save a copy of it, checked for RFC822
4546 syntax and munged if necessary, if it hasn't previously been set by the -F
4547 argument. We may try to get the passwd entry more than once, in case NIS or
4548 other delays are in evidence. Save the home directory for use in filter testing
4553 if ((pw = getpwuid(real_uid)) != NULL)
4555 originator_login = string_copy(US pw->pw_name);
4556 originator_home = string_copy(US pw->pw_dir);
4558 /* If user name has not been set by -F, set it from the passwd entry
4559 unless -f has been used to set the sender address by a trusted user. */
4561 if (!originator_name)
4563 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4565 uschar *name = US pw->pw_gecos;
4566 uschar *amp = Ustrchr(name, '&');
4569 /* Most Unix specify that a '&' character in the gecos field is
4570 replaced by a copy of the login name, and some even specify that
4571 the first character should be upper cased, so that's what we do. */
4576 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4577 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4578 buffer[loffset] = toupper(buffer[loffset]);
4582 /* If a pattern for matching the gecos field was supplied, apply
4583 it and then expand the name string. */
4585 if (gecos_pattern && gecos_name)
4588 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4590 if (regex_match_and_setup(re, name, 0, -1))
4592 uschar *new_name = expand_string(gecos_name);
4596 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4597 "gecos field \"%s\"\n", new_name, name);
4600 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4601 "\"%s\": %s\n", gecos_name, expand_string_message);
4603 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4604 "gecos field \"%s\"\n", gecos_pattern, name);
4605 store_free((void *)re);
4607 originator_name = string_copy(name);
4610 /* A trusted caller has used -f but not -F */
4612 else originator_name = US"";
4615 /* Break the retry loop */
4620 if (++i > finduser_retries) break;
4624 /* If we cannot get a user login, log the incident and give up, unless the
4625 configuration specifies something to use. When running in the test harness,
4626 any setting of unknown_login overrides the actual name. */
4628 if (originator_login == NULL || f.running_in_test_harness)
4630 if (unknown_login != NULL)
4632 originator_login = expand_string(unknown_login);
4633 if (originator_name == NULL && unknown_username != NULL)
4634 originator_name = expand_string(unknown_username);
4635 if (originator_name == NULL) originator_name = US"";
4637 if (originator_login == NULL)
4638 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4642 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4645 originator_name = string_copy(parse_fix_phrase(originator_name,
4646 Ustrlen(originator_name), big_buffer, big_buffer_size));
4648 /* If a message is created by this call of Exim, the uid/gid of its originator
4649 are those of the caller. These values are overridden if an existing message is
4650 read in from the spool. */
4652 originator_uid = real_uid;
4653 originator_gid = real_gid;
4655 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4656 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4658 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4659 returns. We leave this till here so that the originator_ fields are available
4660 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4663 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4667 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4668 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4669 "mua_wrapper is set");
4674 /* If the sender ident has not been set (by a trusted caller) set it to
4675 the caller. This will get overwritten below for an inetd call. If a trusted
4676 caller has set it empty, unset it. */
4678 if (sender_ident == NULL) sender_ident = originator_login;
4679 else if (sender_ident[0] == 0) sender_ident = NULL;
4681 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4682 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4683 originator_* variables set. */
4685 if (test_rewrite_arg >= 0)
4687 f.really_exim = FALSE;
4688 if (test_rewrite_arg >= argc)
4690 printf("-brw needs an address argument\n");
4691 exim_exit(EXIT_FAILURE, US"main");
4693 rewrite_test(argv[test_rewrite_arg]);
4694 exim_exit(EXIT_SUCCESS, US"main");
4697 /* A locally-supplied message is considered to be coming from a local user
4698 unless a trusted caller supplies a sender address with -f, or is passing in the
4699 message via SMTP (inetd invocation or otherwise). */
4701 if ((sender_address == NULL && !smtp_input) ||
4702 (!f.trusted_caller && filter_test == FTEST_NONE))
4704 f.sender_local = TRUE;
4706 /* A trusted caller can supply authenticated_sender and authenticated_id
4707 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4708 defaults except when host checking. */
4710 if (authenticated_sender == NULL && !host_checking)
4711 authenticated_sender = string_sprintf("%s@%s", originator_login,
4712 qualify_domain_sender);
4713 if (authenticated_id == NULL && !host_checking)
4714 authenticated_id = originator_login;
4717 /* Trusted callers are always permitted to specify the sender address.
4718 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4719 is specified is the empty address. However, if a trusted caller does not
4720 specify a sender address for SMTP input, we leave sender_address unset. This
4721 causes the MAIL commands to be honoured. */
4723 if ((!smtp_input && sender_address == NULL) ||
4724 !receive_check_set_sender(sender_address))
4726 /* Either the caller is not permitted to set a general sender, or this is
4727 non-SMTP input and the trusted caller has not set a sender. If there is no
4728 sender, or if a sender other than <> is set, override with the originator's
4729 login (which will get qualified below), except when checking things. */
4731 if (sender_address == NULL /* No sender_address set */
4733 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4734 !checking)) /* Not running tests, including filter tests */
4736 sender_address = originator_login;
4737 f.sender_address_forced = FALSE;
4738 sender_address_domain = 0;
4742 /* Remember whether an untrusted caller set the sender address */
4744 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4746 /* Ensure that the sender address is fully qualified unless it is the empty
4747 address, which indicates an error message, or doesn't exist (root caller, smtp
4748 interface, no -f argument). */
4750 if (sender_address != NULL && sender_address[0] != 0 &&
4751 sender_address_domain == 0)
4752 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4753 qualify_domain_sender);
4755 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4757 /* Handle a request to verify a list of addresses, or test them for delivery.
4758 This must follow the setting of the sender address, since routers can be
4759 predicated upon the sender. If no arguments are given, read addresses from
4760 stdin. Set debug_level to at least D_v to get full output for address testing.
4763 if (verify_address_mode || f.address_test_mode)
4766 int flags = vopt_qualify;
4768 if (verify_address_mode)
4770 if (!verify_as_sender) flags |= vopt_is_recipient;
4771 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4776 flags |= vopt_is_recipient;
4777 debug_selector |= D_v;
4778 debug_file = stderr;
4779 debug_fd = fileno(debug_file);
4780 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4783 if (recipients_arg < argc)
4785 while (recipients_arg < argc)
4787 uschar *s = argv[recipients_arg++];
4790 BOOL finished = FALSE;
4791 uschar *ss = parse_find_address_end(s, FALSE);
4792 if (*ss == ',') *ss = 0; else finished = TRUE;
4793 test_address(s, flags, &exit_value);
4796 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4803 uschar *s = get_stdinput(NULL, NULL);
4804 if (s == NULL) break;
4805 test_address(s, flags, &exit_value);
4809 exim_exit(exit_value, US"main");
4812 /* Handle expansion checking. Either expand items on the command line, or read
4813 from stdin if there aren't any. If -Mset was specified, load the message so
4814 that its variables can be used, but restrict this facility to admin users.
4815 Otherwise, if -bem was used, read a message from stdin. */
4819 dns_init(FALSE, FALSE, FALSE);
4820 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4822 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4824 exim_fail("exim: permission denied\n");
4825 message_id = argv[msg_action_arg];
4826 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4827 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4828 printf ("Failed to load message datafile %s\n", message_id);
4829 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4830 printf ("Failed to load message %s\n", message_id);
4833 /* Read a test message from a file. We fudge it up to be on stdin, saving
4834 stdin itself for later reading of expansion strings. */
4836 else if (expansion_test_message)
4838 int save_stdin = dup(0);
4839 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4841 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4844 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4845 message_ended = END_NOTENDED;
4846 read_message_body(receive_msg(extract_recipients));
4847 message_linecount += body_linecount;
4848 (void)dup2(save_stdin, 0);
4849 (void)close(save_stdin);
4850 clearerr(stdin); /* Required by Darwin */
4853 /* Only admin users may see config-file macros this way */
4855 if (!f.admin_user) macros_user = macros = mlast = NULL;
4857 /* Allow $recipients for this testing */
4859 f.enable_dollar_recipients = TRUE;
4861 /* Expand command line items */
4863 if (recipients_arg < argc)
4864 while (recipients_arg < argc)
4865 expansion_test_line(argv[recipients_arg++]);
4871 char *(*fn_readline)(const char *) = NULL;
4872 void (*fn_addhist)(const char *) = NULL;
4876 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4879 while (s = get_stdinput(fn_readline, fn_addhist))
4880 expansion_test_line(s);
4883 if (dlhandle) dlclose(dlhandle);
4887 /* The data file will be open after -Mset */
4889 if (deliver_datafile >= 0)
4891 (void)close(deliver_datafile);
4892 deliver_datafile = -1;
4895 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4899 /* The active host name is normally the primary host name, but it can be varied
4900 for hosts that want to play several parts at once. We need to ensure that it is
4901 set for host checking, and for receiving messages. */
4903 smtp_active_hostname = primary_hostname;
4904 if (raw_active_hostname != NULL)
4906 uschar *nah = expand_string(raw_active_hostname);
4909 if (!f.expand_string_forcedfail)
4910 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4911 "(smtp_active_hostname): %s", raw_active_hostname,
4912 expand_string_message);
4914 else if (nah[0] != 0) smtp_active_hostname = nah;
4917 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4918 given IP address so that the blocking and relay configuration can be tested.
4919 Unless a sender_ident was set by -oMt, we discard it (the default is the
4920 caller's login name). An RFC 1413 call is made only if we are running in the
4921 test harness and an incoming interface and both ports are specified, because
4922 there is no TCP/IP call to find the ident for. */
4929 if (!sender_ident_set)
4931 sender_ident = NULL;
4932 if (f.running_in_test_harness && sender_host_port != 0 &&
4933 interface_address != NULL && interface_port != 0)
4934 verify_get_ident(1413);
4937 /* In case the given address is a non-canonical IPv6 address, canonicalize
4938 it. The code works for both IPv4 and IPv6, as it happens. */
4940 size = host_aton(sender_host_address, x);
4941 sender_host_address = store_get(48); /* large enough for full IPv6 */
4942 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4944 /* Now set up for testing */
4946 host_build_sender_fullhost();
4950 f.sender_local = FALSE;
4951 f.sender_host_notsocket = TRUE;
4952 debug_file = stderr;
4953 debug_fd = fileno(debug_file);
4954 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4955 "**** but without any ident (RFC 1413) callback.\n"
4956 "**** This is not for real!\n\n",
4957 sender_host_address);
4959 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4960 if (verify_check_host(&hosts_connection_nolog) == OK)
4961 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4962 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4964 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4965 because a log line has already been written for all its failure exists
4966 (usually "connection refused: <reason>") and writing another one is
4967 unnecessary clutter. */
4969 if (smtp_start_session())
4971 for (reset_point = store_get(0); ; store_reset(reset_point))
4973 if (smtp_setup_msg() <= 0) break;
4974 if (!receive_msg(FALSE)) break;
4976 return_path = sender_address = NULL;
4977 dnslist_domain = dnslist_matched = NULL;
4978 #ifndef DISABLE_DKIM
4979 dkim_cur_signer = NULL;
4982 deliver_localpart_orig = NULL;
4983 deliver_domain_orig = NULL;
4984 callout_address = sending_ip_address = NULL;
4985 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4989 exim_exit(EXIT_SUCCESS, US"main");
4993 /* Arrange for message reception if recipients or SMTP were specified;
4994 otherwise complain unless a version print (-bV) happened or this is a filter
4995 verification test or info dump.
4996 In the former case, show the configuration file name. */
4998 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5000 if (version_printed)
5002 if (Ustrchr(config_main_filelist, ':'))
5003 printf("Configuration file search path is %s\n", config_main_filelist);
5004 printf("Configuration file is %s\n", config_main_filename);
5005 return EXIT_SUCCESS;
5008 if (info_flag != CMDINFO_NONE)
5010 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5011 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5014 if (filter_test == FTEST_NONE)
5015 exim_usage(called_as);
5019 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5020 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5021 that we are not called from inetd, because that is rejected above. The
5022 following configuration settings are forced here:
5024 (1) Synchronous delivery (-odi)
5025 (2) Errors to stderr (-oep == -oeq)
5026 (3) No parallel remote delivery
5027 (4) Unprivileged delivery
5029 We don't force overall queueing options because there are several of them;
5030 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5031 to override any SMTP queueing. */
5035 f.synchronous_delivery = TRUE;
5036 arg_error_handling = ERRORS_STDERR;
5037 remote_max_parallel = 1;
5038 deliver_drop_privilege = TRUE;
5039 f.queue_smtp = FALSE;
5040 queue_smtp_domains = NULL;
5042 message_utf8_downconvert = -1; /* convert-if-needed */
5047 /* Prepare to accept one or more new messages on the standard input. When a
5048 message has been read, its id is returned in message_id[]. If doing immediate
5049 delivery, we fork a delivery process for each received message, except for the
5050 last one, where we can save a process switch.
5052 It is only in non-smtp mode that error_handling is allowed to be changed from
5053 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5054 sendmail error modes other than -oem ever actually used? Later: yes.) */
5056 if (!smtp_input) error_handling = arg_error_handling;
5058 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5059 logging being sent down the socket and make an identd call to get the
5062 else if (f.is_inetd)
5064 (void)fclose(stderr);
5065 exim_nullstd(); /* Re-open to /dev/null */
5066 verify_get_ident(IDENT_PORT);
5067 host_build_sender_fullhost();
5068 set_process_info("handling incoming connection from %s via inetd",
5072 /* If the sender host address has been set, build sender_fullhost if it hasn't
5073 already been done (which it will have been for inetd). This caters for the
5074 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5075 so that the test for IP options is skipped for -bs input. */
5077 if (sender_host_address && !sender_fullhost)
5079 host_build_sender_fullhost();
5080 set_process_info("handling incoming connection from %s via -oMa",
5082 f.sender_host_notsocket = TRUE;
5085 /* Otherwise, set the sender host as unknown except for inetd calls. This
5086 prevents host checking in the case of -bs not from inetd and also for -bS. */
5088 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5090 /* If stdout does not exist, then dup stdin to stdout. This can happen
5091 if exim is started from inetd. In this case fd 0 will be set to the socket,
5092 but fd 1 will not be set. This also happens for passed SMTP channels. */
5094 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5096 /* Set up the incoming protocol name and the state of the program. Root is
5097 allowed to force received protocol via the -oMr option above. If we have come
5098 via inetd, the process info has already been set up. We don't set
5099 received_protocol here for smtp input, as it varies according to
5100 batch/HELO/EHLO/AUTH/TLS. */
5104 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5105 smtp_batched_input? "batched " : "",
5106 (sender_address!= NULL)? sender_address : originator_login);
5110 int old_pool = store_pool;
5111 store_pool = POOL_PERM;
5112 if (!received_protocol)
5113 received_protocol = string_sprintf("local%s", called_as);
5114 store_pool = old_pool;
5115 set_process_info("accepting a local non-SMTP message from <%s>",
5119 /* Initialize the session_local_queue-only flag (this will be ignored if
5120 mua_wrapper is set) */
5123 session_local_queue_only = queue_only;
5125 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5126 the spool if so configured. On failure, we must not attempt to send an error
5127 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5128 error code is given.) */
5130 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5131 exim_fail("exim: insufficient disk space\n");
5133 /* If this is smtp input of any kind, real or batched, handle the start of the
5136 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5137 because a log line has already been written for all its failure exists
5138 (usually "connection refused: <reason>") and writing another one is
5139 unnecessary clutter. */
5145 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5146 if (verify_check_host(&hosts_connection_nolog) == OK)
5147 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5148 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5149 if (!smtp_start_session())
5152 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5156 /* Otherwise, set up the input size limit here. */
5160 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5161 if (expand_string_message)
5162 if (thismessage_size_limit == -1)
5163 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5164 "message_size_limit: %s", expand_string_message);
5166 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5167 "message_size_limit: %s", expand_string_message);
5170 /* Loop for several messages when reading SMTP input. If we fork any child
5171 processes, we don't want to wait for them unless synchronous delivery is
5172 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5173 same as SIG_DFL, despite the fact that documentation often lists the default as
5174 "ignore". This is a confusing area. This is what I know:
5176 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5177 processes that complete simply to go away without ever becoming defunct. You
5178 can't then wait for them - but we don't want to wait for them in the
5179 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5180 happen for all OS (e.g. *BSD is different).
5182 But that's not the end of the story. Some (many? all?) systems have the
5183 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5184 has by default, so it seems that the difference is merely one of default
5185 (compare restarting vs non-restarting signals).
5187 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5188 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5189 of the loop below. Paranoia rules.
5191 February 2003: That's *still* not the end of the story. There are now versions
5192 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5193 process then calls waitpid(), a grumble is written to the system log, because
5194 this is logically inconsistent. In other words, it doesn't like the paranoia.
5195 As a consequence of this, the waitpid() below is now excluded if we are sure
5196 that SIG_IGN works. */
5198 if (!f.synchronous_delivery)
5201 struct sigaction act;
5202 act.sa_handler = SIG_IGN;
5203 sigemptyset(&(act.sa_mask));
5204 act.sa_flags = SA_NOCLDWAIT;
5205 sigaction(SIGCHLD, &act, NULL);
5207 signal(SIGCHLD, SIG_IGN);
5211 /* Save the current store pool point, for resetting at the start of
5212 each message, and save the real sender address, if any. */
5214 reset_point = store_get(0);
5215 real_sender_address = sender_address;
5217 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5218 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5225 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5226 input and build the recipients list, before calling receive_msg() to read the
5227 message proper. Whatever sender address is given in the SMTP transaction is
5228 often ignored for local senders - we use the actual sender, which is normally
5229 either the underlying user running this process or a -f argument provided by
5230 a trusted caller. It is saved in real_sender_address. The test for whether to
5231 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5236 if ((rc = smtp_setup_msg()) > 0)
5238 if (real_sender_address != NULL &&
5239 !receive_check_set_sender(sender_address))
5241 sender_address = raw_sender = real_sender_address;
5242 sender_address_unrewritten = NULL;
5245 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5246 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5247 the very end. The result of the ACL is ignored (as for other non-SMTP
5248 messages). It is run for its potential side effects. */
5250 if (smtp_batched_input && acl_not_smtp_start != NULL)
5252 uschar *user_msg, *log_msg;
5253 f.enable_dollar_recipients = TRUE;
5254 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5255 &user_msg, &log_msg);
5256 f.enable_dollar_recipients = FALSE;
5259 /* Now get the data for the message */
5261 more = receive_msg(extract_recipients);
5262 if (message_id[0] == 0)
5264 cancel_cutthrough_connection(TRUE, US"receive dropped");
5265 if (more) goto moreloop;
5266 smtp_log_no_mail(); /* Log no mail if configured */
5267 exim_exit(EXIT_FAILURE, US"receive toplevel");
5272 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5273 smtp_log_no_mail(); /* Log no mail if configured */
5274 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5278 /* In the non-SMTP case, we have all the information from the command
5279 line, but must process it in case it is in the more general RFC822
5280 format, and in any case, to detect syntax errors. Also, it appears that
5281 the use of comma-separated lists as single arguments is common, so we
5282 had better support them. */
5288 int count = argc - recipients_arg;
5289 uschar **list = argv + recipients_arg;
5291 /* These options cannot be changed dynamically for non-SMTP messages */
5293 f.active_local_sender_retain = local_sender_retain;
5294 f.active_local_from_check = local_from_check;
5296 /* Save before any rewriting */
5298 raw_sender = string_copy(sender_address);
5300 /* Loop for each argument */
5302 for (i = 0; i < count; i++)
5304 int start, end, domain;
5306 uschar *s = list[i];
5308 /* Loop for each comma-separated address */
5312 BOOL finished = FALSE;
5314 uschar *ss = parse_find_address_end(s, FALSE);
5316 if (*ss == ',') *ss = 0; else finished = TRUE;
5318 /* Check max recipients - if -t was used, these aren't recipients */
5320 if (recipients_max > 0 && ++rcount > recipients_max &&
5321 !extract_recipients)
5322 if (error_handling == ERRORS_STDERR)
5324 fprintf(stderr, "exim: too many recipients\n");
5325 exim_exit(EXIT_FAILURE, US"main");
5329 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5330 errors_sender_rc : EXIT_FAILURE;
5334 BOOL b = allow_utf8_domains;
5335 allow_utf8_domains = TRUE;
5338 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5341 if (string_is_utf8(recipient))
5342 message_smtputf8 = TRUE;
5344 allow_utf8_domains = b;
5347 if (domain == 0 && !f.allow_unqualified_recipient)
5350 errmess = US"unqualified recipient address not allowed";
5353 if (recipient == NULL)
5355 if (error_handling == ERRORS_STDERR)
5357 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5358 string_printing(list[i]), errmess);
5359 exim_exit(EXIT_FAILURE, US"main");
5365 eblock.text1 = string_printing(list[i]);
5366 eblock.text2 = errmess;
5368 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5369 errors_sender_rc : EXIT_FAILURE;
5373 receive_add_recipient(recipient, -1);
5376 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5380 /* Show the recipients when debugging */
5385 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5386 if (recipients_list != NULL)
5388 debug_printf("Recipients:\n");
5389 for (i = 0; i < recipients_count; i++)
5390 debug_printf(" %s\n", recipients_list[i].address);
5394 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5395 ignored; rejecting here would just add complication, and it can just as
5396 well be done later. Allow $recipients to be visible in the ACL. */
5398 if (acl_not_smtp_start)
5400 uschar *user_msg, *log_msg;
5401 f.enable_dollar_recipients = TRUE;
5402 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5403 &user_msg, &log_msg);
5404 f.enable_dollar_recipients = FALSE;
5407 /* Pause for a while waiting for input. If none received in that time,
5408 close the logfile, if we had one open; then if we wait for a long-running
5409 datasource (months, in one use-case) log rotation will not leave us holding
5412 if (!receive_timeout)
5414 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5417 FD_ZERO(&r); FD_SET(0, &r);
5418 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5421 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5422 will just read the headers for the message, and not write anything onto the
5425 message_ended = END_NOTENDED;
5426 more = receive_msg(extract_recipients);
5428 /* more is always FALSE here (not SMTP message) when reading a message
5429 for real; when reading the headers of a message for filter testing,
5430 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5432 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5433 } /* Non-SMTP message reception */
5435 /* If this is a filter testing run, there are headers in store, but
5436 no message on the spool. Run the filtering code in testing mode, setting
5437 the domain to the qualify domain and the local part to the current user,
5438 unless they have been set by options. The prefix and suffix are left unset
5439 unless specified. The the return path is set to to the sender unless it has
5440 already been set from a return-path header in the message. */
5442 if (filter_test != FTEST_NONE)
5444 deliver_domain = (ftest_domain != NULL)?
5445 ftest_domain : qualify_domain_recipient;
5446 deliver_domain_orig = deliver_domain;
5447 deliver_localpart = (ftest_localpart != NULL)?
5448 ftest_localpart : originator_login;
5449 deliver_localpart_orig = deliver_localpart;
5450 deliver_localpart_prefix = ftest_prefix;
5451 deliver_localpart_suffix = ftest_suffix;
5452 deliver_home = originator_home;
5454 if (return_path == NULL)
5456 printf("Return-path copied from sender\n");
5457 return_path = string_copy(sender_address);
5460 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5461 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5463 receive_add_recipient(
5464 string_sprintf("%s%s%s@%s",
5465 (ftest_prefix == NULL)? US"" : ftest_prefix,
5467 (ftest_suffix == NULL)? US"" : ftest_suffix,
5468 deliver_domain), -1);
5470 printf("Recipient = %s\n", recipients_list[0].address);
5471 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5472 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5474 if (chdir("/")) /* Get away from wherever the user is running this from */
5476 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5477 exim_exit(EXIT_FAILURE, US"main");
5480 /* Now we run either a system filter test, or a user filter test, or both.
5481 In the latter case, headers added by the system filter will persist and be
5482 available to the user filter. We need to copy the filter variables
5485 if ((filter_test & FTEST_SYSTEM) != 0)
5486 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5487 exim_exit(EXIT_FAILURE, US"main");
5489 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5491 if ((filter_test & FTEST_USER) != 0)
5492 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5493 exim_exit(EXIT_FAILURE, US"main");
5495 exim_exit(EXIT_SUCCESS, US"main");
5498 /* Else act on the result of message reception. We should not get here unless
5499 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5500 will be TRUE. If it is not, check on the number of messages received in this
5503 if (!session_local_queue_only &&
5504 smtp_accept_queue_per_connection > 0 &&
5505 receive_messagecount > smtp_accept_queue_per_connection)
5507 session_local_queue_only = TRUE;
5508 queue_only_reason = 2;
5511 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5512 and queue_only_load is set, check that the load average is below it. If it is
5513 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5514 default), we put the whole session into queue_only mode. It then remains this
5515 way for any subsequent messages on the same SMTP connection. This is a
5516 deliberate choice; even though the load average may fall, it doesn't seem
5517 right to deliver later messages on the same call when not delivering earlier
5518 ones. However, there are odd cases where this is not wanted, so this can be
5519 changed by setting queue_only_load_latch false. */
5521 local_queue_only = session_local_queue_only;
5522 if (!local_queue_only && queue_only_load >= 0)
5524 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5525 if (local_queue_only)
5527 queue_only_reason = 3;
5528 if (queue_only_load_latch) session_local_queue_only = TRUE;
5532 /* If running as an MUA wrapper, all queueing options and freezing options
5536 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5538 /* Log the queueing here, when it will get a message id attached, but
5539 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5542 if (local_queue_only)
5544 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5545 switch(queue_only_reason)
5548 log_write(L_delay_delivery,
5549 LOG_MAIN, "no immediate delivery: more than %d messages "
5550 "received in one connection", smtp_accept_queue_per_connection);
5554 log_write(L_delay_delivery,
5555 LOG_MAIN, "no immediate delivery: load average %.2f",
5556 (double)load_average/1000.0);
5561 else if (f.queue_only_policy || f.deliver_freeze)
5562 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5564 /* Else do the delivery unless the ACL or local_scan() called for queue only
5565 or froze the message. Always deliver in a separate process. A fork failure is
5566 not a disaster, as the delivery will eventually happen on a subsequent queue
5567 run. The search cache must be tidied before the fork, as the parent will
5568 do it before exiting. The child will trigger a lookup failure and
5569 thereby defer the delivery if it tries to use (for example) a cached ldap
5570 connection that the parent has called unbind on. */
5577 if ((pid = fork()) == 0)
5580 close_unwanted(); /* Close unwanted file descriptors and TLS */
5581 exim_nullstd(); /* Ensure std{in,out,err} exist */
5583 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5584 mode, deliver_drop_privilege is forced TRUE). */
5586 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5588 delivery_re_exec(CEE_EXEC_EXIT);
5589 /* Control does not return here. */
5592 /* No need to re-exec */
5594 rc = deliver_message(message_id, FALSE, FALSE);
5596 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5597 EXIT_SUCCESS : EXIT_FAILURE);
5602 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5603 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5604 "process: %s", strerror(errno));
5608 release_cutthrough_connection(US"msg passed for delivery");
5610 /* In the parent, wait if synchronous delivery is required. This will
5611 always be the case in MUA wrapper mode. */
5613 if (f.synchronous_delivery)
5616 while (wait(&status) != pid);
5617 if ((status & 0x00ff) != 0)
5618 log_write(0, LOG_MAIN|LOG_PANIC,
5619 "process %d crashed with signal %d while delivering %s",
5620 (int)pid, status & 0x00ff, message_id);
5621 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5626 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5627 automatically reaps children (see comments above the loop), clear away any
5628 finished subprocesses here, in case there are lots of messages coming in
5629 from the same source. */
5631 #ifndef SIG_IGN_WORKS
5632 while (waitpid(-1, NULL, WNOHANG) > 0);
5636 return_path = sender_address = NULL;
5637 authenticated_sender = NULL;
5638 deliver_localpart_orig = NULL;
5639 deliver_domain_orig = NULL;
5640 deliver_host = deliver_host_address = NULL;
5641 dnslist_domain = dnslist_matched = NULL;
5642 #ifdef WITH_CONTENT_SCAN
5643 malware_name = NULL;
5645 callout_address = NULL;
5646 sending_ip_address = NULL;
5648 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5650 store_reset(reset_point);
5653 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5654 return 0; /* To stop compiler warning */