1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
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, sizeof(ovector)/sizeof(int));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = (setup < 0)? 0 : setup + 1;
150 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
193 /*************************************************
194 * Handler for SIGUSR1 *
195 *************************************************/
197 /* SIGUSR1 causes any exim process to write to the process log details of
198 what it is currently doing. It will only be used if the OS is capable of
199 setting up a handler that causes automatic restarting of any system call
200 that is in progress at the time.
202 This function takes care to be signal-safe.
204 Argument: the signal number (SIGUSR1)
209 usr1_handler(int sig)
213 os_restarting_signal(sig, usr1_handler);
215 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
217 /* If we are already running as the Exim user, try to create it in the
218 current process (assuming spool_directory exists). Otherwise, if we are
219 root, do the creation in an exim:exim subprocess. */
221 int euid = geteuid();
222 if (euid == exim_uid)
223 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
224 else if (euid == root_uid)
225 fd = log_create_as_exim(process_log_path);
228 /* If we are neither exim nor root, or if we failed to create the log file,
229 give up. There is not much useful we can do with errors, since we don't want
230 to disrupt whatever is going on outside the signal handler. */
234 (void)write(fd, process_info, process_info_len);
240 /*************************************************
242 *************************************************/
244 /* This handler is enabled most of the time that Exim is running. The handler
245 doesn't actually get used unless alarm() has been called to set a timer, to
246 place a time limit on a system call of some kind. When the handler is run, it
249 There are some other SIGALRM handlers that are used in special cases when more
250 than just a flag setting is required; for example, when reading a message's
251 input. These are normally set up in the code module that uses them, and the
252 SIGALRM handler is reset to this one afterwards.
254 Argument: the signal value (SIGALRM)
259 sigalrm_handler(int sig)
261 sig = sig; /* Keep picky compilers happy */
263 os_non_restarting_signal(SIGALRM, sigalrm_handler);
268 /*************************************************
269 * Sleep for a fractional time interval *
270 *************************************************/
272 /* This function is called by millisleep() and exim_wait_tick() to wait for a
273 period of time that may include a fraction of a second. The coding is somewhat
274 tedious. We do not expect setitimer() ever to fail, but if it does, the process
275 will wait for ever, so we panic in this instance. (There was a case of this
276 when a bug in a function that calls milliwait() caused it to pass invalid data.
277 That's when I added the check. :-)
279 We assume it to be not worth sleeping for under 100us; this value will
280 require revisiting as hardware advances. This avoids the issue of
281 a zero-valued timer setting meaning "never fire".
283 Argument: an itimerval structure containing the interval
288 milliwait(struct itimerval *itval)
291 sigset_t old_sigmask;
293 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
295 (void)sigemptyset(&sigmask); /* Empty mask */
296 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
297 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
298 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
299 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
300 "setitimer() failed: %s", strerror(errno));
301 (void)sigfillset(&sigmask); /* All signals */
302 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
303 (void)sigsuspend(&sigmask); /* Until SIGALRM */
304 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
310 /*************************************************
311 * Millisecond sleep function *
312 *************************************************/
314 /* The basic sleep() function has a granularity of 1 second, which is too rough
315 in some cases - for example, when using an increasing delay to slow down
318 Argument: number of millseconds
325 struct itimerval itval;
326 itval.it_interval.tv_sec = 0;
327 itval.it_interval.tv_usec = 0;
328 itval.it_value.tv_sec = msec/1000;
329 itval.it_value.tv_usec = (msec % 1000) * 1000;
335 /*************************************************
336 * Compare microsecond times *
337 *************************************************/
344 Returns: -1, 0, or +1
348 exim_tvcmp(struct timeval *t1, struct timeval *t2)
350 if (t1->tv_sec > t2->tv_sec) return +1;
351 if (t1->tv_sec < t2->tv_sec) return -1;
352 if (t1->tv_usec > t2->tv_usec) return +1;
353 if (t1->tv_usec < t2->tv_usec) return -1;
360 /*************************************************
361 * Clock tick wait function *
362 *************************************************/
364 /* Exim uses a time + a pid to generate a unique identifier in two places: its
365 message IDs, and in file names for maildir deliveries. Because some OS now
366 re-use pids within the same second, sub-second times are now being used.
367 However, for absolute certainty, we must ensure the clock has ticked before
368 allowing the relevant process to complete. At the time of implementation of
369 this code (February 2003), the speed of processors is such that the clock will
370 invariably have ticked already by the time a process has done its job. This
371 function prepares for the time when things are faster - and it also copes with
372 clocks that go backwards.
375 then_tv A timeval which was used to create uniqueness; its usec field
376 has been rounded down to the value of the resolution.
377 We want to be sure the current time is greater than this.
378 resolution The resolution that was used to divide the microseconds
379 (1 for maildir, larger for message ids)
385 exim_wait_tick(struct timeval *then_tv, int resolution)
387 struct timeval now_tv;
388 long int now_true_usec;
390 (void)gettimeofday(&now_tv, NULL);
391 now_true_usec = now_tv.tv_usec;
392 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
394 if (exim_tvcmp(&now_tv, then_tv) <= 0)
396 struct itimerval itval;
397 itval.it_interval.tv_sec = 0;
398 itval.it_interval.tv_usec = 0;
399 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
400 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
402 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
403 negative value for the microseconds is possible only in the case when "now"
404 is more than a second less than "then". That means that itval.it_value.tv_sec
405 is greater than zero. The following correction is therefore safe. */
407 if (itval.it_value.tv_usec < 0)
409 itval.it_value.tv_usec += 1000000;
410 itval.it_value.tv_sec -= 1;
413 DEBUG(D_transport|D_receive)
415 if (!running_in_test_harness)
417 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
418 then_tv->tv_sec, (long) then_tv->tv_usec,
419 now_tv.tv_sec, (long) now_tv.tv_usec);
420 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
421 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
432 /*************************************************
433 * Call fopen() with umask 777 and adjust mode *
434 *************************************************/
436 /* Exim runs with umask(0) so that files created with open() have the mode that
437 is specified in the open() call. However, there are some files, typically in
438 the spool directory, that are created with fopen(). They end up world-writeable
439 if no precautions are taken. Although the spool directory is not accessible to
440 the world, this is an untidiness. So this is a wrapper function for fopen()
441 that sorts out the mode of the created file.
444 filename the file name
445 options the fopen() options
446 mode the required mode
448 Returns: the fopened FILE or NULL
452 modefopen(const uschar *filename, const char *options, mode_t mode)
454 mode_t saved_umask = umask(0777);
455 FILE *f = Ufopen(filename, options);
456 (void)umask(saved_umask);
457 if (f != NULL) (void)fchmod(fileno(f), mode);
464 /*************************************************
465 * Ensure stdin, stdout, and stderr exist *
466 *************************************************/
468 /* Some operating systems grumble if an exec() happens without a standard
469 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
470 file will be opened and will use these fd values, and then some other bit of
471 code will assume, for example, that it can write error messages to stderr.
472 This function ensures that fds 0, 1, and 2 are open if they do not already
473 exist, by connecting them to /dev/null.
475 This function is also used to ensure that std{in,out,err} exist at all times,
476 so that if any library that Exim calls tries to use them, it doesn't crash.
488 for (i = 0; i <= 2; i++)
490 if (fstat(i, &statbuf) < 0 && errno == EBADF)
492 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
493 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
494 string_open_failed(errno, "/dev/null"));
495 if (devnull != i) (void)dup2(devnull, i);
498 if (devnull > 2) (void)close(devnull);
504 /*************************************************
505 * Close unwanted file descriptors for delivery *
506 *************************************************/
508 /* This function is called from a new process that has been forked to deliver
509 an incoming message, either directly, or using exec.
511 We want any smtp input streams to be closed in this new process. However, it
512 has been observed that using fclose() here causes trouble. When reading in -bS
513 input, duplicate copies of messages have been seen. The files will be sharing a
514 file pointer with the parent process, and it seems that fclose() (at least on
515 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
516 least sometimes. Hence we go for closing the underlying file descriptors.
518 If TLS is active, we want to shut down the TLS library, but without molesting
519 the parent's SSL connection.
521 For delivery of a non-SMTP message, we want to close stdin and stdout (and
522 stderr unless debugging) because the calling process might have set them up as
523 pipes and be waiting for them to close before it waits for the submission
524 process to terminate. If they aren't closed, they hold up the calling process
525 until the initial delivery process finishes, which is not what we want.
527 Exception: We do want it for synchronous delivery!
529 And notwithstanding all the above, if D_resolver is set, implying resolver
530 debugging, leave stdout open, because that's where the resolver writes its
533 When we close stderr (which implies we've also closed stdout), we also get rid
534 of any controlling terminal.
546 tls_close(TRUE, FALSE); /* Shut down the TLS library */
548 (void)close(fileno(smtp_in));
549 (void)close(fileno(smtp_out));
554 (void)close(0); /* stdin */
555 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
556 if (debug_selector == 0) /* stderr */
558 if (!synchronous_delivery)
571 /*************************************************
573 *************************************************/
575 /* This function sets a new uid and gid permanently, optionally calling
576 initgroups() to set auxiliary groups. There are some special cases when running
577 Exim in unprivileged modes. In these situations the effective uid will not be
578 root; if we already have the right effective uid/gid, and don't need to
579 initialize any groups, leave things as they are.
584 igflag TRUE if initgroups() wanted
585 msg text to use in debugging output and failure log
587 Returns: nothing; bombs out on failure
591 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
593 uid_t euid = geteuid();
594 gid_t egid = getegid();
596 if (euid == root_uid || euid != uid || egid != gid || igflag)
598 /* At least one OS returns +1 for initgroups failure, so just check for
603 struct passwd *pw = getpwuid(uid);
606 if (initgroups(pw->pw_name, gid) != 0)
607 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
608 (long int)uid, strerror(errno));
610 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
611 "no passwd entry for uid=%ld", (long int)uid);
614 if (setgid(gid) < 0 || setuid(uid) < 0)
616 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
617 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
621 /* Debugging output included uid/gid and all groups */
625 int group_count, save_errno;
626 gid_t group_list[NGROUPS_MAX];
627 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
628 (long int)geteuid(), (long int)getegid(), (long int)getpid());
629 group_count = getgroups(NGROUPS_MAX, group_list);
631 debug_printf(" auxiliary group list:");
635 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
637 else if (group_count < 0)
638 debug_printf(" <error: %s>", strerror(save_errno));
639 else debug_printf(" <none>");
647 /*************************************************
649 *************************************************/
651 /* Exim exits via this function so that it always clears up any open
657 Returns: does not return
661 exim_exit(int rc, const uschar * process)
665 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
666 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
667 process ? "(" : "", process, process ? ") " : "", rc);
674 /*************************************************
675 * Extract port from host address *
676 *************************************************/
678 /* Called to extract the port from the values given to -oMa and -oMi.
679 It also checks the syntax of the address, and terminates it before the
680 port data when a port is extracted.
683 address the address, with possible port on the end
685 Returns: the port, or zero if there isn't one
686 bombs out on a syntax error
690 check_port(uschar *address)
692 int port = host_address_extract_port(address);
693 if (string_is_ip_address(address, NULL) == 0)
695 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
703 /*************************************************
704 * Test/verify an address *
705 *************************************************/
707 /* This function is called by the -bv and -bt code. It extracts a working
708 address from a full RFC 822 address. This isn't really necessary per se, but it
709 has the effect of collapsing source routes.
713 flags flag bits for verify_address()
714 exit_value to be set for failures
720 test_address(uschar *s, int flags, int *exit_value)
722 int start, end, domain;
723 uschar *parse_error = NULL;
724 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
728 fprintf(stdout, "syntax error: %s\n", parse_error);
733 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
734 -1, -1, NULL, NULL, NULL);
735 if (rc == FAIL) *exit_value = 2;
736 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
742 /*************************************************
743 * Show supported features *
744 *************************************************/
746 /* This function is called for -bV/--version and for -d to output the optional
747 features of the current Exim binary.
749 Arguments: a FILE for printing
754 show_whats_supported(FILE *f)
758 #ifdef DB_VERSION_STRING
759 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
760 #elif defined(BTREEVERSION) && defined(HASHVERSION)
762 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
764 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
766 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
767 fprintf(f, "Probably ndbm\n");
768 #elif defined(USE_TDB)
769 fprintf(f, "Using tdb\n");
772 fprintf(f, "Probably GDBM (native mode)\n");
774 fprintf(f, "Probably GDBM (compatibility mode)\n");
778 fprintf(f, "Support for:");
779 #ifdef SUPPORT_CRYPTEQ
780 fprintf(f, " crypteq");
783 fprintf(f, " iconv()");
788 #ifdef HAVE_SETCLASSRESOURCES
789 fprintf(f, " use_setclassresources");
798 fprintf(f, " Expand_dlfunc");
800 #ifdef USE_TCP_WRAPPERS
801 fprintf(f, " TCPwrappers");
805 fprintf(f, " GnuTLS");
807 fprintf(f, " OpenSSL");
810 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
811 fprintf(f, " translate_ip_address");
813 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
814 fprintf(f, " move_frozen_messages");
816 #ifdef WITH_CONTENT_SCAN
817 fprintf(f, " Content_Scanning");
822 #ifndef DISABLE_DNSSEC
823 fprintf(f, " DNSSEC");
825 #ifndef DISABLE_EVENT
826 fprintf(f, " Event");
838 fprintf(f, " PROXY");
841 fprintf(f, " SOCKS");
845 if (tcp_fastopen_ok) fprintf(f, " TCP_Fast_Open");
847 #ifdef EXPERIMENTAL_LMDB
848 fprintf(f, " Experimental_LMDB");
850 #ifdef EXPERIMENTAL_QUEUEFILE
851 fprintf(f, " Experimental_QUEUEFILE");
853 #ifdef EXPERIMENTAL_SPF
854 fprintf(f, " Experimental_SPF");
856 #ifdef EXPERIMENTAL_SRS
857 fprintf(f, " Experimental_SRS");
859 #ifdef EXPERIMENTAL_BRIGHTMAIL
860 fprintf(f, " Experimental_Brightmail");
862 #ifdef EXPERIMENTAL_DANE
863 fprintf(f, " Experimental_DANE");
865 #ifdef EXPERIMENTAL_DCC
866 fprintf(f, " Experimental_DCC");
868 #ifdef EXPERIMENTAL_DMARC
869 fprintf(f, " Experimental_DMARC");
871 #ifdef EXPERIMENTAL_DSN_INFO
872 fprintf(f, " Experimental_DSN_info");
876 fprintf(f, "Lookups (built-in):");
877 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
878 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
880 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
883 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
884 fprintf(f, " dbm dbmjz dbmnz");
886 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
887 fprintf(f, " dnsdb");
889 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
890 fprintf(f, " dsearch");
892 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
893 fprintf(f, " ibase");
895 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
896 fprintf(f, " ldap ldapdn ldapm");
898 #ifdef EXPERIMENTAL_LMDB
901 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
902 fprintf(f, " mysql");
904 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
905 fprintf(f, " nis nis0");
907 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
908 fprintf(f, " nisplus");
910 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
911 fprintf(f, " oracle");
913 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
914 fprintf(f, " passwd");
916 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
917 fprintf(f, " pgsql");
919 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
920 fprintf(f, " redis");
922 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
923 fprintf(f, " sqlite");
925 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
926 fprintf(f, " testdb");
928 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
929 fprintf(f, " whoson");
933 auth_show_supported(f);
934 route_show_supported(f);
935 transport_show_supported(f);
937 if (fixed_never_users[0] > 0)
940 fprintf(f, "Fixed never_users: ");
941 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
942 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
943 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
946 fprintf(f, "Configure owner: %d:%d\n", config_uid, config_gid);
948 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
950 /* Everything else is details which are only worth reporting when debugging.
951 Perhaps the tls_version_report should move into this too. */
956 /* clang defines __GNUC__ (at least, for me) so test for it first */
957 #if defined(__clang__)
958 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
959 #elif defined(__GNUC__)
960 fprintf(f, "Compiler: GCC [%s]\n",
964 "? unknown version ?"
968 fprintf(f, "Compiler: <unknown>\n");
971 #if defined(__GLIBC__) && !defined(__UCLIBC__)
972 fprintf(f, "Library version: Glibc: Compile: %d.%d\n",
973 __GLIBC__, __GLIBC_MINOR__);
974 if (__GLIBC_PREREQ(2, 1))
975 fprintf(f, " Runtime: %s\n",
976 gnu_get_libc_version());
980 tls_version_report(f);
983 utf8_version_report(f);
986 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
987 if (authi->version_report)
988 (*authi->version_report)(f);
990 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
991 characters; unless it's an ancient version of PCRE in which case it
993 #ifndef PCRE_PRERELEASE
994 # define PCRE_PRERELEASE
997 #define EXPAND_AND_QUOTE(X) QUOTE(X)
998 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1000 PCRE_MAJOR, PCRE_MINOR,
1001 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1004 #undef EXPAND_AND_QUOTE
1007 for (i = 0; i < lookup_list_count; i++)
1008 if (lookup_list[i]->version_report)
1009 lookup_list[i]->version_report(f);
1011 #ifdef WHITELIST_D_MACROS
1012 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1014 fprintf(f, "WHITELIST_D_MACROS unset\n");
1016 #ifdef TRUSTED_CONFIG_LIST
1017 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1019 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1026 /*************************************************
1027 * Show auxiliary information about Exim *
1028 *************************************************/
1031 show_exim_information(enum commandline_info request, FILE *stream)
1038 fprintf(stream, "Oops, something went wrong.\n");
1042 "The -bI: flag takes a string indicating which information to provide.\n"
1043 "If the string is not recognised, you'll get this help (on stderr).\n"
1045 " exim -bI:help this information\n"
1046 " exim -bI:dscp list of known dscp value keywords\n"
1047 " exim -bI:sieve list of supported sieve extensions\n"
1051 for (pp = exim_sieve_extension_list; *pp; ++pp)
1052 fprintf(stream, "%s\n", *pp);
1055 dscp_list_to_stream(stream);
1061 /*************************************************
1062 * Quote a local part *
1063 *************************************************/
1065 /* This function is used when a sender address or a From: or Sender: header
1066 line is being created from the caller's login, or from an authenticated_id. It
1067 applies appropriate quoting rules for a local part.
1069 Argument: the local part
1070 Returns: the local part, quoted if necessary
1074 local_part_quote(uschar *lpart)
1076 BOOL needs_quote = FALSE;
1080 for (t = lpart; !needs_quote && *t != 0; t++)
1082 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1083 (*t != '.' || t == lpart || t[1] == 0);
1086 if (!needs_quote) return lpart;
1088 g = string_catn(NULL, US"\"", 1);
1092 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1095 g = string_cat(g, lpart);
1098 g = string_catn(g, lpart, nq - lpart);
1099 g = string_catn(g, US"\\", 1);
1100 g = string_catn(g, nq, 1);
1104 g = string_catn(g, US"\"", 1);
1105 return string_from_gstring(g);
1111 /*************************************************
1112 * Load readline() functions *
1113 *************************************************/
1115 /* This function is called from testing executions that read data from stdin,
1116 but only when running as the calling user. Currently, only -be does this. The
1117 function loads the readline() function library and passes back the functions.
1118 On some systems, it needs the curses library, so load that too, but try without
1119 it if loading fails. All this functionality has to be requested at build time.
1122 fn_readline_ptr pointer to where to put the readline pointer
1123 fn_addhist_ptr pointer to where to put the addhistory function
1125 Returns: the dlopen handle or NULL on failure
1129 set_readline(char * (**fn_readline_ptr)(const char *),
1130 void (**fn_addhist_ptr)(const char *))
1133 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1135 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1136 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1138 if (dlhandle != NULL)
1140 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1141 * char * readline (const char *prompt);
1142 * void add_history (const char *string);
1144 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1145 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1149 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1158 /*************************************************
1159 * Get a line from stdin for testing things *
1160 *************************************************/
1162 /* This function is called when running tests that can take a number of lines
1163 of input (for example, -be and -bt). It handles continuations and trailing
1164 spaces. And prompting and a blank line output on eof. If readline() is in use,
1165 the arguments are non-NULL and provide the relevant functions.
1168 fn_readline readline function or NULL
1169 fn_addhist addhist function or NULL
1171 Returns: pointer to dynamic memory, or NULL at end of file
1175 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1180 if (!fn_readline) { printf("> "); fflush(stdout); }
1184 uschar buffer[1024];
1188 char *readline_line = NULL;
1189 if (fn_readline != NULL)
1191 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1192 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1193 p = US readline_line;
1198 /* readline() not in use */
1201 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1205 /* Handle the line */
1207 ss = p + (int)Ustrlen(p);
1208 while (ss > p && isspace(ss[-1])) ss--;
1212 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1215 g = string_catn(g, p, ss - p);
1218 if (fn_readline) free(readline_line);
1221 /* g can only be NULL if ss==p */
1222 if (ss == p || g->s[g->ptr-1] != '\\')
1226 (void) string_from_gstring(g);
1229 if (!g) printf("\n");
1230 return string_from_gstring(g);
1235 /*************************************************
1236 * Output usage information for the program *
1237 *************************************************/
1239 /* This function is called when there are no recipients
1240 or a specific --help argument was added.
1243 progname information on what name we were called by
1245 Returns: DOES NOT RETURN
1249 exim_usage(uschar *progname)
1252 /* Handle specific program invocation variants */
1253 if (Ustrcmp(progname, US"-mailq") == 0)
1256 "mailq - list the contents of the mail queue\n\n"
1257 "For a list of options, see the Exim documentation.\n");
1261 /* Generic usage - we output this whatever happens */
1263 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1264 "not directly from a shell command line. Options and/or arguments control\n"
1265 "what it does when called. For a list of options, see the Exim documentation.\n");
1272 /*************************************************
1273 * Validate that the macros given are okay *
1274 *************************************************/
1276 /* Typically, Exim will drop privileges if macros are supplied. In some
1277 cases, we want to not do so.
1279 Arguments: opt_D_used - true if the commandline had a "-D" option
1280 Returns: true if trusted, false otherwise
1284 macros_trusted(BOOL opt_D_used)
1286 #ifdef WHITELIST_D_MACROS
1288 uschar *whitelisted, *end, *p, **whites, **w;
1289 int white_count, i, n;
1291 BOOL prev_char_item, found;
1296 #ifndef WHITELIST_D_MACROS
1300 /* We only trust -D overrides for some invoking users:
1301 root, the exim run-time user, the optional config owner user.
1302 I don't know why config-owner would be needed, but since they can own the
1303 config files anyway, there's no security risk to letting them override -D. */
1304 if ( ! ((real_uid == root_uid)
1305 || (real_uid == exim_uid)
1306 #ifdef CONFIGURE_OWNER
1307 || (real_uid == config_uid)
1311 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1315 /* Get a list of macros which are whitelisted */
1316 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1317 prev_char_item = FALSE;
1319 for (p = whitelisted; *p != '\0'; ++p)
1321 if (*p == ':' || isspace(*p))
1326 prev_char_item = FALSE;
1329 if (!prev_char_item)
1330 prev_char_item = TRUE;
1337 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1338 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1343 if (i == white_count)
1345 while (*p != '\0' && p < end)
1351 /* The list of commandline macros should be very short.
1352 Accept the N*M complexity. */
1353 for (m = macros; m; m = m->next) if (m->command_line)
1356 for (w = whites; *w; ++w)
1357 if (Ustrcmp(*w, m->name) == 0)
1364 if (!m->replacement)
1366 if ((len = m->replen) == 0)
1368 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1369 0, PCRE_EOPT, NULL, 0);
1372 if (n != PCRE_ERROR_NOMATCH)
1373 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1377 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1383 /*************************************************
1384 * Expansion testing *
1385 *************************************************/
1387 /* Expand and print one item, doing macro-processing.
1390 item line for expansion
1394 expansion_test_line(uschar * line)
1399 Ustrncpy(big_buffer, line, big_buffer_size);
1400 big_buffer[big_buffer_size-1] = '\0';
1401 len = Ustrlen(big_buffer);
1403 (void) macros_expand(0, &len, &dummy_macexp);
1405 if (isupper(big_buffer[0]))
1407 if (macro_read_assignment(big_buffer))
1408 printf("Defined macro '%s'\n", mlast->name);
1411 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1412 else printf("Failed: %s\n", expand_string_message);
1416 /*************************************************
1417 * Entry point and high-level code *
1418 *************************************************/
1420 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1421 the appropriate action. All the necessary functions are present in the one
1422 binary. I originally thought one should split it up, but it turns out that so
1423 much of the apparatus is needed in each chunk that one might as well just have
1424 it all available all the time, which then makes the coding easier as well.
1427 argc count of entries in argv
1428 argv argument strings, with argv[0] being the program name
1430 Returns: EXIT_SUCCESS if terminated successfully
1431 EXIT_FAILURE otherwise, except when a message has been sent
1432 to the sender, and -oee was given
1436 main(int argc, char **cargv)
1438 uschar **argv = USS cargv;
1439 int arg_receive_timeout = -1;
1440 int arg_smtp_receive_timeout = -1;
1441 int arg_error_handling = error_handling;
1442 int filter_sfd = -1;
1443 int filter_ufd = -1;
1446 int list_queue_option = 0;
1448 int msg_action_arg = -1;
1449 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1450 int queue_only_reason = 0;
1452 int perl_start_option = 0;
1454 int recipients_arg = argc;
1455 int sender_address_domain = 0;
1456 int test_retry_arg = -1;
1457 int test_rewrite_arg = -1;
1458 BOOL arg_queue_only = FALSE;
1459 BOOL bi_option = FALSE;
1460 BOOL checking = FALSE;
1461 BOOL count_queue = FALSE;
1462 BOOL expansion_test = FALSE;
1463 BOOL extract_recipients = FALSE;
1464 BOOL flag_G = FALSE;
1465 BOOL flag_n = FALSE;
1466 BOOL forced_delivery = FALSE;
1467 BOOL f_end_dot = FALSE;
1468 BOOL deliver_give_up = FALSE;
1469 BOOL list_queue = FALSE;
1470 BOOL list_options = FALSE;
1471 BOOL list_config = FALSE;
1472 BOOL local_queue_only;
1474 BOOL one_msg_action = FALSE;
1475 BOOL opt_D_used = FALSE;
1476 BOOL queue_only_set = FALSE;
1477 BOOL receiving_message = TRUE;
1478 BOOL sender_ident_set = FALSE;
1479 BOOL session_local_queue_only;
1481 BOOL removed_privilege = FALSE;
1482 BOOL usage_wanted = FALSE;
1483 BOOL verify_address_mode = FALSE;
1484 BOOL verify_as_sender = FALSE;
1485 BOOL version_printed = FALSE;
1486 uschar *alias_arg = NULL;
1487 uschar *called_as = US"";
1488 uschar *cmdline_syslog_name = NULL;
1489 uschar *start_queue_run_id = NULL;
1490 uschar *stop_queue_run_id = NULL;
1491 uschar *expansion_test_message = NULL;
1492 uschar *ftest_domain = NULL;
1493 uschar *ftest_localpart = NULL;
1494 uschar *ftest_prefix = NULL;
1495 uschar *ftest_suffix = NULL;
1496 uschar *log_oneline = NULL;
1497 uschar *malware_test_file = NULL;
1498 uschar *real_sender_address;
1499 uschar *originator_home = US"/";
1504 struct stat statbuf;
1505 pid_t passed_qr_pid = (pid_t)0;
1506 int passed_qr_pipe = -1;
1507 gid_t group_list[NGROUPS_MAX];
1509 /* For the -bI: flag */
1510 enum commandline_info info_flag = CMDINFO_NONE;
1511 BOOL info_stdout = FALSE;
1513 /* Possible options for -R and -S */
1515 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1517 /* Need to define this in case we need to change the environment in order
1518 to get rid of a bogus time zone. We have to make it char rather than uschar
1519 because some OS define it in /usr/include/unistd.h. */
1521 extern char **environ;
1523 /* If the Exim user and/or group and/or the configuration file owner/group were
1524 defined by ref:name at build time, we must now find the actual uid/gid values.
1525 This is a feature to make the lives of binary distributors easier. */
1527 #ifdef EXIM_USERNAME
1528 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1532 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1536 /* If ref:name uses a number as the name, route_finduser() returns
1537 TRUE with exim_uid set and pw coerced to NULL. */
1539 exim_gid = pw->pw_gid;
1540 #ifndef EXIM_GROUPNAME
1544 "exim: ref:name should specify a usercode, not a group.\n"
1545 "exim: can't let you get away with it unless you also specify a group.\n");
1552 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1558 #ifdef EXIM_GROUPNAME
1559 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1561 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1567 #ifdef CONFIGURE_OWNERNAME
1568 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1570 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1571 CONFIGURE_OWNERNAME);
1576 /* We default the system_filter_user to be the Exim run-time user, as a
1577 sane non-root value. */
1578 system_filter_uid = exim_uid;
1580 #ifdef CONFIGURE_GROUPNAME
1581 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1583 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1584 CONFIGURE_GROUPNAME);
1589 /* In the Cygwin environment, some initialization used to need doing.
1590 It was fudged in by means of this macro; now no longer but we'll leave
1591 it in case of others. */
1597 /* Check a field which is patched when we are running Exim within its
1598 testing harness; do a fast initial check, and then the whole thing. */
1600 running_in_test_harness =
1601 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1603 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1604 at the start of a program; however, it seems that some environments do not
1605 follow this. A "strange" locale can affect the formatting of timestamps, so we
1608 setlocale(LC_ALL, "C");
1610 /* Set up the default handler for timing using alarm(). */
1612 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1614 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1615 because store_malloc writes a log entry on failure. */
1617 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1619 fprintf(stderr, "exim: failed to get store for log buffer\n");
1623 /* Initialize the default log options. */
1625 bits_set(log_selector, log_selector_size, log_default);
1627 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1628 NULL when the daemon is run and the file is closed. We have to use this
1629 indirection, because some systems don't allow writing to the variable "stderr".
1632 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1634 /* Arrange for the PCRE regex library to use our store functions. Note that
1635 the normal calls are actually macros that add additional arguments for
1636 debugging purposes so we have to assign specially constructed functions here.
1637 The default is to use store in the stacking pool, but this is overridden in the
1638 regex_must_compile() function. */
1640 pcre_malloc = function_store_get;
1641 pcre_free = function_dummy_free;
1643 /* Ensure there is a big buffer for temporary use in several places. It is put
1644 in malloc store so that it can be freed for enlargement if necessary. */
1646 big_buffer = store_malloc(big_buffer_size);
1648 /* Set up the handler for the data request signal, and set the initial
1649 descriptive text. */
1651 set_process_info("initializing");
1652 os_restarting_signal(SIGUSR1, usr1_handler);
1654 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1655 in the daemon code. For the rest of Exim's uses, we ignore it. */
1657 signal(SIGHUP, SIG_IGN);
1659 /* We don't want to die on pipe errors as the code is written to handle
1660 the write error instead. */
1662 signal(SIGPIPE, SIG_IGN);
1664 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1665 set to SIG_IGN. This causes subprocesses that complete before the parent
1666 process waits for them not to hang around, so when Exim calls wait(), nothing
1667 is there. The wait() code has been made robust against this, but let's ensure
1668 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1669 ending status. We use sigaction rather than plain signal() on those OS where
1670 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1671 problem on AIX with this.) */
1675 struct sigaction act;
1676 act.sa_handler = SIG_DFL;
1677 sigemptyset(&(act.sa_mask));
1679 sigaction(SIGCHLD, &act, NULL);
1682 signal(SIGCHLD, SIG_DFL);
1685 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1690 /* Set up the version number. Set up the leading 'E' for the external form of
1691 message ids, set the pointer to the internal form, and initialize it to
1692 indicate no message being processed. */
1695 message_id_option[0] = '-';
1696 message_id_external = message_id_option + 1;
1697 message_id_external[0] = 'E';
1698 message_id = message_id_external + 1;
1701 /* Set the umask to zero so that any files Exim creates using open() are
1702 created with the modes that it specifies. NOTE: Files created with fopen() have
1703 a problem, which was not recognized till rather late (February 2006). With this
1704 umask, such files will be world writeable. (They are all content scanning files
1705 in the spool directory, which isn't world-accessible, so this is not a
1706 disaster, but it's untidy.) I don't want to change this overall setting,
1707 however, because it will interact badly with the open() calls. Instead, there's
1708 now a function called modefopen() that fiddles with the umask while calling
1713 /* Precompile the regular expression for matching a message id. Keep this in
1714 step with the code that generates ids in the accept.c module. We need to do
1715 this here, because the -M options check their arguments for syntactic validity
1716 using mac_ismsgid, which uses this. */
1719 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1721 /* Precompile the regular expression that is used for matching an SMTP error
1722 code, possibly extended, at the start of an error message. Note that the
1723 terminating whitespace character is included. */
1726 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1729 #ifdef WHITELIST_D_MACROS
1730 /* Precompile the regular expression used to filter the content of macros
1731 given to -D for permissibility. */
1733 regex_whitelisted_macro =
1734 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1737 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1739 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1740 this seems to be a generally accepted convention, since one finds symbolic
1741 links called "mailq" in standard OS configurations. */
1743 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1744 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1747 receiving_message = FALSE;
1748 called_as = US"-mailq";
1751 /* If the program is called as "rmail" treat it as equivalent to
1752 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1753 i.e. preventing a single dot on a line from terminating the message, and
1754 returning with zero return code, even in cases of error (provided an error
1755 message has been sent). */
1757 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1758 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1761 called_as = US"-rmail";
1762 errors_sender_rc = EXIT_SUCCESS;
1765 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1766 this is a smail convention. */
1768 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1769 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1771 smtp_input = smtp_batched_input = TRUE;
1772 called_as = US"-rsmtp";
1775 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1776 this is a smail convention. */
1778 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1779 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1782 receiving_message = FALSE;
1783 called_as = US"-runq";
1786 /* If the program is called as "newaliases" treat it as equivalent to
1787 "exim -bi"; this is a sendmail convention. */
1789 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1790 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1793 receiving_message = FALSE;
1794 called_as = US"-newaliases";
1797 /* Save the original effective uid for a couple of uses later. It should
1798 normally be root, but in some esoteric environments it may not be. */
1800 original_euid = geteuid();
1802 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1803 to be the same as the real ones. This makes a difference only if Exim is setuid
1804 (or setgid) to something other than root, which could be the case in some
1805 special configurations. */
1807 real_uid = getuid();
1808 real_gid = getgid();
1810 if (real_uid == root_uid)
1812 rv = setgid(real_gid);
1815 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1816 (long int)real_gid, strerror(errno));
1819 rv = setuid(real_uid);
1822 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1823 (long int)real_uid, strerror(errno));
1828 /* If neither the original real uid nor the original euid was root, Exim is
1829 running in an unprivileged state. */
1831 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1833 /* Scan the program's arguments. Some can be dealt with right away; others are
1834 simply recorded for checking and handling afterwards. Do a high-level switch
1835 on the second character (the one after '-'), to save some effort. */
1837 for (i = 1; i < argc; i++)
1839 BOOL badarg = FALSE;
1840 uschar *arg = argv[i];
1844 /* An argument not starting with '-' is the start of a recipients list;
1845 break out of the options-scanning loop. */
1853 /* An option consisting of -- terminates the options */
1855 if (Ustrcmp(arg, "--") == 0)
1857 recipients_arg = i + 1;
1861 /* Handle flagged options */
1863 switchchar = arg[1];
1866 /* Make all -ex options synonymous with -oex arguments, since that
1867 is assumed by various callers. Also make -qR options synonymous with -R
1868 options, as that seems to be required as well. Allow for -qqR too, and
1869 the same for -S options. */
1871 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1872 Ustrncmp(arg+1, "qR", 2) == 0 ||
1873 Ustrncmp(arg+1, "qS", 2) == 0)
1875 switchchar = arg[2];
1878 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1880 switchchar = arg[3];
1882 queue_2stage = TRUE;
1885 /* Make -r synonymous with -f, since it is a documented alias */
1887 else if (arg[1] == 'r') switchchar = 'f';
1889 /* Make -ov synonymous with -v */
1891 else if (Ustrcmp(arg, "-ov") == 0)
1897 /* deal with --option_aliases */
1898 else if (switchchar == '-')
1900 if (Ustrcmp(argrest, "help") == 0)
1902 usage_wanted = TRUE;
1905 else if (Ustrcmp(argrest, "version") == 0)
1912 /* High-level switch on active initial letter */
1917 /* sendmail uses -Ac and -Am to control which .cf file is used;
1920 if (*argrest == '\0') { badarg = TRUE; break; }
1923 BOOL ignore = FALSE;
1928 if (*(argrest + 1) == '\0')
1932 if (!ignore) { badarg = TRUE; break; }
1936 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1937 so has no need of it. */
1940 if (*argrest == 0) i++; /* Skip over the type */
1945 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1947 /* -bd: Run in daemon mode, awaiting SMTP connections.
1948 -bdf: Ditto, but in the foreground.
1951 if (*argrest == 'd')
1953 daemon_listen = TRUE;
1954 if (*(++argrest) == 'f') background_daemon = FALSE;
1955 else if (*argrest != 0) { badarg = TRUE; break; }
1958 /* -be: Run in expansion test mode
1959 -bem: Ditto, but read a message from a file first
1962 else if (*argrest == 'e')
1964 expansion_test = checking = TRUE;
1965 if (argrest[1] == 'm')
1967 if (++i >= argc) { badarg = TRUE; break; }
1968 expansion_test_message = argv[i];
1971 if (argrest[1] != 0) { badarg = TRUE; break; }
1974 /* -bF: Run system filter test */
1976 else if (*argrest == 'F')
1978 filter_test |= checking = FTEST_SYSTEM;
1979 if (*(++argrest) != 0) { badarg = TRUE; break; }
1980 if (++i < argc) filter_test_sfile = argv[i]; else
1982 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1987 /* -bf: Run user filter test
1988 -bfd: Set domain for filter testing
1989 -bfl: Set local part for filter testing
1990 -bfp: Set prefix for filter testing
1991 -bfs: Set suffix for filter testing
1994 else if (*argrest == 'f')
1996 if (*(++argrest) == 0)
1998 filter_test |= checking = FTEST_USER;
1999 if (++i < argc) filter_test_ufile = argv[i]; else
2001 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2009 fprintf(stderr, "exim: string expected after %s\n", arg);
2012 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2013 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2014 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2015 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2016 else { badarg = TRUE; break; }
2020 /* -bh: Host checking - an IP address must follow. */
2022 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2024 if (++i >= argc) { badarg = TRUE; break; }
2025 sender_host_address = argv[i];
2026 host_checking = checking = log_testing_mode = TRUE;
2027 host_checking_callout = argrest[1] == 'c';
2028 message_logs = FALSE;
2031 /* -bi: This option is used by sendmail to initialize *the* alias file,
2032 though it has the -oA option to specify a different file. Exim has no
2033 concept of *the* alias file, but since Sun's YP make script calls
2034 sendmail this way, some support must be provided. */
2036 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2038 /* -bI: provide information, of the type to follow after a colon.
2039 This is an Exim flag. */
2041 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2043 uschar *p = &argrest[2];
2044 info_flag = CMDINFO_HELP;
2047 if (strcmpic(p, CUS"sieve") == 0)
2049 info_flag = CMDINFO_SIEVE;
2052 else if (strcmpic(p, CUS"dscp") == 0)
2054 info_flag = CMDINFO_DSCP;
2057 else if (strcmpic(p, CUS"help") == 0)
2064 /* -bm: Accept and deliver message - the default option. Reinstate
2065 receiving_message, which got turned off for all -b options. */
2067 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2069 /* -bmalware: test the filename given for malware */
2071 else if (Ustrcmp(argrest, "malware") == 0)
2073 if (++i >= argc) { badarg = TRUE; break; }
2075 malware_test_file = argv[i];
2078 /* -bnq: For locally originating messages, do not qualify unqualified
2079 addresses. In the envelope, this causes errors; in header lines they
2082 else if (Ustrcmp(argrest, "nq") == 0)
2084 allow_unqualified_sender = FALSE;
2085 allow_unqualified_recipient = FALSE;
2088 /* -bpxx: List the contents of the mail queue, in various forms. If
2089 the option is -bpc, just a queue count is needed. Otherwise, if the
2090 first letter after p is r, then order is random. */
2092 else if (*argrest == 'p')
2094 if (*(++argrest) == 'c')
2097 if (*(++argrest) != 0) badarg = TRUE;
2101 if (*argrest == 'r')
2103 list_queue_option = 8;
2106 else list_queue_option = 0;
2110 /* -bp: List the contents of the mail queue, top-level only */
2112 if (*argrest == 0) {}
2114 /* -bpu: List the contents of the mail queue, top-level undelivered */
2116 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2118 /* -bpa: List the contents of the mail queue, including all delivered */
2120 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2122 /* Unknown after -bp[r] */
2132 /* -bP: List the configuration variables given as the address list.
2133 Force -v, so configuration errors get displayed. */
2135 else if (Ustrcmp(argrest, "P") == 0)
2137 /* -bP config: we need to setup here, because later,
2138 * when list_options is checked, the config is read already */
2139 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2142 readconf_save_config(version_string);
2146 list_options = TRUE;
2147 debug_selector |= D_v;
2148 debug_file = stderr;
2152 /* -brt: Test retry configuration lookup */
2154 else if (Ustrcmp(argrest, "rt") == 0)
2157 test_retry_arg = i + 1;
2161 /* -brw: Test rewrite configuration */
2163 else if (Ustrcmp(argrest, "rw") == 0)
2166 test_rewrite_arg = i + 1;
2170 /* -bS: Read SMTP commands on standard input, but produce no replies -
2171 all errors are reported by sending messages. */
2173 else if (Ustrcmp(argrest, "S") == 0)
2174 smtp_input = smtp_batched_input = receiving_message = TRUE;
2176 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2177 on standard output. */
2179 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2181 /* -bt: address testing mode */
2183 else if (Ustrcmp(argrest, "t") == 0)
2184 address_test_mode = checking = log_testing_mode = TRUE;
2186 /* -bv: verify addresses */
2188 else if (Ustrcmp(argrest, "v") == 0)
2189 verify_address_mode = checking = log_testing_mode = TRUE;
2191 /* -bvs: verify sender addresses */
2193 else if (Ustrcmp(argrest, "vs") == 0)
2195 verify_address_mode = checking = log_testing_mode = TRUE;
2196 verify_as_sender = TRUE;
2199 /* -bV: Print version string and support details */
2201 else if (Ustrcmp(argrest, "V") == 0)
2203 printf("Exim version %s #%s built %s\n", version_string,
2204 version_cnumber, version_date);
2205 printf("%s\n", CS version_copyright);
2206 version_printed = TRUE;
2207 show_whats_supported(stdout);
2208 log_testing_mode = TRUE;
2211 /* -bw: inetd wait mode, accept a listening socket as stdin */
2213 else if (*argrest == 'w')
2215 inetd_wait_mode = TRUE;
2216 background_daemon = FALSE;
2217 daemon_listen = TRUE;
2218 if (*(++argrest) != '\0')
2220 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2221 if (inetd_wait_timeout <= 0)
2223 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2233 /* -C: change configuration file list; ignore if it isn't really
2234 a change! Enforce a prefix check if required. */
2239 if(++i < argc) argrest = argv[i]; else
2240 { badarg = TRUE; break; }
2242 if (Ustrcmp(config_main_filelist, argrest) != 0)
2244 #ifdef ALT_CONFIG_PREFIX
2246 int len = Ustrlen(ALT_CONFIG_PREFIX);
2247 const uschar *list = argrest;
2249 while((filename = string_nextinlist(&list, &sep, big_buffer,
2250 big_buffer_size)) != NULL)
2252 if ((Ustrlen(filename) < len ||
2253 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2254 Ustrstr(filename, "/../") != NULL) &&
2255 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2257 fprintf(stderr, "-C Permission denied\n");
2262 if (real_uid != root_uid)
2264 #ifdef TRUSTED_CONFIG_LIST
2266 if (real_uid != exim_uid
2267 #ifdef CONFIGURE_OWNER
2268 && real_uid != config_uid
2271 trusted_config = FALSE;
2274 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2277 struct stat statbuf;
2279 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2280 (statbuf.st_uid != root_uid /* owner not root */
2281 #ifdef CONFIGURE_OWNER
2282 && statbuf.st_uid != config_uid /* owner not the special one */
2285 (statbuf.st_gid != root_gid /* group not root */
2286 #ifdef CONFIGURE_GROUP
2287 && statbuf.st_gid != config_gid /* group not the special one */
2289 && (statbuf.st_mode & 020) != 0 /* group writeable */
2291 (statbuf.st_mode & 2) != 0) /* world writeable */
2293 trusted_config = FALSE;
2298 /* Well, the trust list at least is up to scratch... */
2299 void *reset_point = store_get(0);
2300 uschar *trusted_configs[32];
2304 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2306 uschar *start = big_buffer, *nl;
2307 while (*start && isspace(*start))
2311 nl = Ustrchr(start, '\n');
2314 trusted_configs[nr_configs++] = string_copy(start);
2315 if (nr_configs == 32)
2323 const uschar *list = argrest;
2325 while (trusted_config && (filename = string_nextinlist(&list,
2326 &sep, big_buffer, big_buffer_size)) != NULL)
2328 for (i=0; i < nr_configs; i++)
2330 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2333 if (i == nr_configs)
2335 trusted_config = FALSE;
2339 store_reset(reset_point);
2343 /* No valid prefixes found in trust_list file. */
2344 trusted_config = FALSE;
2350 /* Could not open trust_list file. */
2351 trusted_config = FALSE;
2355 /* Not root; don't trust config */
2356 trusted_config = FALSE;
2360 config_main_filelist = argrest;
2361 config_changed = TRUE;
2366 /* -D: set up a macro definition */
2369 #ifdef DISABLE_D_OPTION
2370 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2377 uschar *s = argrest;
2380 while (isspace(*s)) s++;
2382 if (*s < 'A' || *s > 'Z')
2384 fprintf(stderr, "exim: macro name set by -D must start with "
2385 "an upper case letter\n");
2389 while (isalnum(*s) || *s == '_')
2391 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2395 if (ptr == 0) { badarg = TRUE; break; }
2396 while (isspace(*s)) s++;
2399 if (*s++ != '=') { badarg = TRUE; break; }
2400 while (isspace(*s)) s++;
2403 for (m = macros; m; m = m->next)
2404 if (Ustrcmp(m->name, name) == 0)
2406 fprintf(stderr, "exim: duplicated -D in command line\n");
2410 m = macro_create(string_copy(name), string_copy(s), TRUE);
2412 if (clmacro_count >= MAX_CLMACROS)
2414 fprintf(stderr, "exim: too many -D options on command line\n");
2417 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2423 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2424 The latter is now a no-op, retained for compatibility only. If -dd is used,
2425 debugging subprocesses of the daemon is disabled. */
2428 if (Ustrcmp(argrest, "ropcr") == 0)
2430 /* drop_cr = TRUE; */
2433 /* Use an intermediate variable so that we don't set debugging while
2434 decoding the debugging bits. */
2438 unsigned int selector = D_default;
2441 if (*argrest == 'd')
2443 debug_daemon = TRUE;
2447 decode_bits(&selector, 1, debug_notall, argrest,
2448 debug_options, debug_options_count, US"debug", 0);
2449 debug_selector = selector;
2454 /* -E: This is a local error message. This option is not intended for
2455 external use at all, but is not restricted to trusted callers because it
2456 does no harm (just suppresses certain error messages) and if Exim is run
2457 not setuid root it won't always be trusted when it generates error
2458 messages using this option. If there is a message id following -E, point
2459 message_reference at it, for logging. */
2462 local_error_message = TRUE;
2463 if (mac_ismsgid(argrest)) message_reference = argrest;
2467 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2468 option, so it looks as if historically the -oex options are also callable
2469 without the leading -o. So we have to accept them. Before the switch,
2470 anything starting -oe has been converted to -e. Exim does not support all
2471 of the sendmail error options. */
2474 if (Ustrcmp(argrest, "e") == 0)
2476 arg_error_handling = ERRORS_SENDER;
2477 errors_sender_rc = EXIT_SUCCESS;
2479 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2480 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2481 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2482 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2487 /* -F: Set sender's full name, used instead of the gecos entry from
2488 the password file. Since users can usually alter their gecos entries,
2489 there's no security involved in using this instead. The data can follow
2490 the -F or be in the next argument. */
2495 if(++i < argc) argrest = argv[i]; else
2496 { badarg = TRUE; break; }
2498 originator_name = argrest;
2499 sender_name_forced = TRUE;
2503 /* -f: Set sender's address - this value is only actually used if Exim is
2504 run by a trusted user, or if untrusted_set_sender is set and matches the
2505 address, except that the null address can always be set by any user. The
2506 test for this happens later, when the value given here is ignored when not
2507 permitted. For an untrusted user, the actual sender is still put in Sender:
2508 if it doesn't match the From: header (unless no_local_from_check is set).
2509 The data can follow the -f or be in the next argument. The -r switch is an
2510 obsolete form of -f but since there appear to be programs out there that
2511 use anything that sendmail has ever supported, better accept it - the
2512 synonymizing is done before the switch above.
2514 At this stage, we must allow domain literal addresses, because we don't
2515 know what the setting of allow_domain_literals is yet. Ditto for trailing
2516 dots and strip_trailing_dot. */
2520 int dummy_start, dummy_end;
2524 if (i+1 < argc) argrest = argv[++i]; else
2525 { badarg = TRUE; break; }
2528 sender_address = string_sprintf(""); /* Ensure writeable memory */
2531 uschar *temp = argrest + Ustrlen(argrest) - 1;
2532 while (temp >= argrest && isspace(*temp)) temp--;
2533 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2534 allow_domain_literals = TRUE;
2535 strip_trailing_dot = TRUE;
2537 allow_utf8_domains = TRUE;
2539 sender_address = parse_extract_address(argrest, &errmess,
2540 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2542 message_smtputf8 = string_is_utf8(sender_address);
2543 allow_utf8_domains = FALSE;
2545 allow_domain_literals = FALSE;
2546 strip_trailing_dot = FALSE;
2547 if (sender_address == NULL)
2549 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2550 return EXIT_FAILURE;
2553 sender_address_forced = TRUE;
2557 /* -G: sendmail invocation to specify that it's a gateway submission and
2558 sendmail may complain about problems instead of fixing them.
2559 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2560 not at this time complain about problems. */
2566 /* -h: Set the hop count for an incoming message. Exim does not currently
2567 support this; it always computes it by counting the Received: headers.
2568 To put it in will require a change to the spool header file format. */
2573 if(++i < argc) argrest = argv[i]; else
2574 { badarg = TRUE; break; }
2576 if (!isdigit(*argrest)) badarg = TRUE;
2580 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2581 not to be documented for sendmail but mailx (at least) uses it) */
2584 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2588 /* -L: set the identifier used for syslog; equivalent to setting
2589 syslog_processname in the config file, but needs to be an admin option. */
2592 if (*argrest == '\0')
2594 if(++i < argc) argrest = argv[i]; else
2595 { badarg = TRUE; break; }
2597 sz = Ustrlen(argrest);
2600 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2601 return EXIT_FAILURE;
2605 fprintf(stderr, "exim: the -L syslog name is too short\n");
2606 return EXIT_FAILURE;
2608 cmdline_syslog_name = argrest;
2612 receiving_message = FALSE;
2614 /* -MC: continue delivery of another message via an existing open
2615 file descriptor. This option is used for an internal call by the
2616 smtp transport when there is a pending message waiting to go to an
2617 address to which it has got a connection. Five subsequent arguments are
2618 required: transport name, host name, IP address, sequence number, and
2619 message_id. Transports may decline to create new processes if the sequence
2620 number gets too big. The channel is stdin. This (-MC) must be the last
2621 argument. There's a subsequent check that the real-uid is privileged.
2623 If we are running in the test harness. delay for a bit, to let the process
2624 that set this one up complete. This makes for repeatability of the logging,
2627 if (Ustrcmp(argrest, "C") == 0)
2629 union sockaddr_46 interface_sock;
2630 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2634 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2635 return EXIT_FAILURE;
2638 if (msg_action_arg >= 0)
2640 fprintf(stderr, "exim: incompatible arguments\n");
2641 return EXIT_FAILURE;
2644 continue_transport = argv[++i];
2645 continue_hostname = argv[++i];
2646 continue_host_address = argv[++i];
2647 continue_sequence = Uatoi(argv[++i]);
2648 msg_action = MSG_DELIVER;
2649 msg_action_arg = ++i;
2650 forced_delivery = TRUE;
2651 queue_run_pid = passed_qr_pid;
2652 queue_run_pipe = passed_qr_pipe;
2654 if (!mac_ismsgid(argv[i]))
2656 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2658 return EXIT_FAILURE;
2661 /* Set up $sending_ip_address and $sending_port, unless proxied */
2663 if (!continue_proxy_cipher)
2664 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2666 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2670 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2672 return EXIT_FAILURE;
2675 if (running_in_test_harness) millisleep(500);
2679 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2683 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2684 precedes -MC (see above). The flag indicates that the host to which
2685 Exim is connected has accepted an AUTH sequence. */
2687 case 'A': smtp_authenticated = TRUE; break;
2689 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2690 that exim is connected to supports the esmtp extension DSN */
2692 case 'D': smtp_peer_options |= OPTION_DSN; break;
2694 /* -MCG: set the queue name, to a non-default value */
2696 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2700 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2702 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2704 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2705 it preceded -MC (see above) */
2707 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2709 /* -MCQ: pass on the pid of the queue-running process that started
2710 this chain of deliveries and the fd of its synchronizing pipe; this
2711 is useful only when it precedes -MC (see above) */
2713 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2715 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2719 /* -MCS: set the smtp_use_size flag; this is useful only when it
2720 precedes -MC (see above) */
2722 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2725 /* -MCt: similar to -MCT below but the connection is still open
2726 via a proxy proces which handles the TLS context and coding.
2727 Require three arguments for the proxied local address and port,
2728 and the TLS cipher. */
2730 case 't': if (++i < argc) sending_ip_address = argv[i];
2732 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2734 if (++i < argc) continue_proxy_cipher = argv[i];
2738 /* -MCT: set the tls_offered flag; this is useful only when it
2739 precedes -MC (see above). The flag indicates that the host to which
2740 Exim is connected has offered TLS support. */
2742 case 'T': smtp_peer_options |= OPTION_TLS; break;
2745 default: badarg = TRUE; break;
2750 /* -M[x]: various operations on the following list of message ids:
2751 -M deliver the messages, ignoring next retry times and thawing
2752 -Mc deliver the messages, checking next retry times, no thawing
2753 -Mf freeze the messages
2754 -Mg give up on the messages
2755 -Mt thaw the messages
2756 -Mrm remove the messages
2757 In the above cases, this must be the last option. There are also the
2758 following options which are followed by a single message id, and which
2759 act on that message. Some of them use the "recipient" addresses as well.
2760 -Mar add recipient(s)
2761 -Mmad mark all recipients delivered
2762 -Mmd mark recipients(s) delivered
2764 -Mset load a message for use with -be
2766 -Mvc show copy (of whole message, in RFC 2822 format)
2771 else if (*argrest == 0)
2773 msg_action = MSG_DELIVER;
2774 forced_delivery = deliver_force_thaw = TRUE;
2776 else if (Ustrcmp(argrest, "ar") == 0)
2778 msg_action = MSG_ADD_RECIPIENT;
2779 one_msg_action = TRUE;
2781 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2782 else if (Ustrcmp(argrest, "es") == 0)
2784 msg_action = MSG_EDIT_SENDER;
2785 one_msg_action = TRUE;
2787 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2788 else if (Ustrcmp(argrest, "g") == 0)
2790 msg_action = MSG_DELIVER;
2791 deliver_give_up = TRUE;
2793 else if (Ustrcmp(argrest, "mad") == 0)
2795 msg_action = MSG_MARK_ALL_DELIVERED;
2797 else if (Ustrcmp(argrest, "md") == 0)
2799 msg_action = MSG_MARK_DELIVERED;
2800 one_msg_action = TRUE;
2802 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2803 else if (Ustrcmp(argrest, "set") == 0)
2805 msg_action = MSG_LOAD;
2806 one_msg_action = TRUE;
2808 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2809 else if (Ustrcmp(argrest, "vb") == 0)
2811 msg_action = MSG_SHOW_BODY;
2812 one_msg_action = TRUE;
2814 else if (Ustrcmp(argrest, "vc") == 0)
2816 msg_action = MSG_SHOW_COPY;
2817 one_msg_action = TRUE;
2819 else if (Ustrcmp(argrest, "vh") == 0)
2821 msg_action = MSG_SHOW_HEADER;
2822 one_msg_action = TRUE;
2824 else if (Ustrcmp(argrest, "vl") == 0)
2826 msg_action = MSG_SHOW_LOG;
2827 one_msg_action = TRUE;
2829 else { badarg = TRUE; break; }
2831 /* All the -Mxx options require at least one message id. */
2833 msg_action_arg = i + 1;
2834 if (msg_action_arg >= argc)
2836 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2837 return EXIT_FAILURE;
2840 /* Some require only message ids to follow */
2842 if (!one_msg_action)
2845 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2847 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2849 return EXIT_FAILURE;
2851 goto END_ARG; /* Remaining args are ids */
2854 /* Others require only one message id, possibly followed by addresses,
2855 which will be handled as normal arguments. */
2859 if (!mac_ismsgid(argv[msg_action_arg]))
2861 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2862 argv[msg_action_arg], arg);
2863 return EXIT_FAILURE;
2870 /* Some programs seem to call the -om option without the leading o;
2871 for sendmail it askes for "me too". Exim always does this. */
2874 if (*argrest != 0) badarg = TRUE;
2878 /* -N: don't do delivery - a debugging option that stops transports doing
2879 their thing. It implies debugging at the D_v level. */
2884 dont_deliver = TRUE;
2885 debug_selector |= D_v;
2886 debug_file = stderr;
2892 /* -n: This means "don't alias" in sendmail, apparently.
2893 For normal invocations, it has no effect.
2894 It may affect some other options. */
2900 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2901 option to the specified value. This form uses long names. We need to handle
2902 -O option=value and -Ooption=value. */
2909 fprintf(stderr, "exim: string expected after -O\n");
2917 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2920 if (*argrest == 'A')
2922 alias_arg = argrest + 1;
2923 if (alias_arg[0] == 0)
2925 if (i+1 < argc) alias_arg = argv[++i]; else
2927 fprintf(stderr, "exim: string expected after -oA\n");
2933 /* -oB: Set a connection message max value for remote deliveries */
2935 else if (*argrest == 'B')
2937 uschar *p = argrest + 1;
2940 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2942 connection_max_messages = 1;
2951 fprintf(stderr, "exim: number expected after -oB\n");
2954 connection_max_messages = Uatoi(p);
2958 /* -odb: background delivery */
2960 else if (Ustrcmp(argrest, "db") == 0)
2962 synchronous_delivery = FALSE;
2963 arg_queue_only = FALSE;
2964 queue_only_set = TRUE;
2967 /* -odf: foreground delivery (smail-compatible option); same effect as
2968 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2971 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2973 synchronous_delivery = TRUE;
2974 arg_queue_only = FALSE;
2975 queue_only_set = TRUE;
2978 /* -odq: queue only */
2980 else if (Ustrcmp(argrest, "dq") == 0)
2982 synchronous_delivery = FALSE;
2983 arg_queue_only = TRUE;
2984 queue_only_set = TRUE;
2987 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2988 but no remote delivery */
2990 else if (Ustrcmp(argrest, "dqs") == 0)
2993 arg_queue_only = FALSE;
2994 queue_only_set = TRUE;
2997 /* -oex: Sendmail error flags. As these are also accepted without the
2998 leading -o prefix, for compatibility with vacation and other callers,
2999 they are handled with -e above. */
3001 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3002 -oitrue: Another sendmail syntax for the same */
3004 else if (Ustrcmp(argrest, "i") == 0 ||
3005 Ustrcmp(argrest, "itrue") == 0)
3008 /* -oM*: Set various characteristics for an incoming message; actually
3009 acted on for trusted callers only. */
3011 else if (*argrest == 'M')
3015 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
3019 /* -oMa: Set sender host address */
3021 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
3023 /* -oMaa: Set authenticator name */
3025 else if (Ustrcmp(argrest, "Maa") == 0)
3026 sender_host_authenticated = argv[++i];
3028 /* -oMas: setting authenticated sender */
3030 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3032 /* -oMai: setting authenticated id */
3034 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3036 /* -oMi: Set incoming interface address */
3038 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3040 /* -oMm: Message reference */
3042 else if (Ustrcmp(argrest, "Mm") == 0)
3044 if (!mac_ismsgid(argv[i+1]))
3046 fprintf(stderr,"-oMm must be a valid message ID\n");
3049 if (!trusted_config)
3051 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3054 message_reference = argv[++i];
3057 /* -oMr: Received protocol */
3059 else if (Ustrcmp(argrest, "Mr") == 0)
3061 if (received_protocol)
3063 fprintf(stderr, "received_protocol is set already\n");
3066 else received_protocol = argv[++i];
3068 /* -oMs: Set sender host name */
3070 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3072 /* -oMt: Set sender ident */
3074 else if (Ustrcmp(argrest, "Mt") == 0)
3076 sender_ident_set = TRUE;
3077 sender_ident = argv[++i];
3080 /* Else a bad argument */
3089 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3090 seem to call this as -m (undocumented), so that is also accepted (see
3093 else if (Ustrcmp(argrest, "m") == 0) {}
3095 /* -oo: An ancient flag for old-style addresses which still seems to
3096 crop up in some calls (see in SCO). */
3098 else if (Ustrcmp(argrest, "o") == 0) {}
3100 /* -oP <name>: set pid file path for daemon */
3102 else if (Ustrcmp(argrest, "P") == 0)
3103 override_pid_file_path = argv[++i];
3105 /* -or <n>: set timeout for non-SMTP acceptance
3106 -os <n>: set timeout for SMTP acceptance */
3108 else if (*argrest == 'r' || *argrest == 's')
3110 int *tp = (*argrest == 'r')?
3111 &arg_receive_timeout : &arg_smtp_receive_timeout;
3112 if (argrest[1] == 0)
3114 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3116 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3119 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3124 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3126 else if (Ustrcmp(argrest, "X") == 0)
3127 override_local_interfaces = argv[++i];
3129 /* Unknown -o argument */
3135 /* -ps: force Perl startup; -pd force delayed Perl startup */
3139 if (*argrest == 's' && argrest[1] == 0)
3141 perl_start_option = 1;
3144 if (*argrest == 'd' && argrest[1] == 0)
3146 perl_start_option = -1;
3151 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3152 which sets the host protocol and host name */
3156 argrest = argv[++i];
3158 { badarg = TRUE; break; }
3164 if (received_protocol)
3166 fprintf(stderr, "received_protocol is set already\n");
3170 hn = Ustrchr(argrest, ':');
3172 received_protocol = argrest;
3175 int old_pool = store_pool;
3176 store_pool = POOL_PERM;
3177 received_protocol = string_copyn(argrest, hn - argrest);
3178 store_pool = old_pool;
3179 sender_host_name = hn + 1;
3186 receiving_message = FALSE;
3187 if (queue_interval >= 0)
3189 fprintf(stderr, "exim: -q specified more than once\n");
3193 /* -qq...: Do queue runs in a 2-stage manner */
3195 if (*argrest == 'q')
3197 queue_2stage = TRUE;
3201 /* -qi...: Do only first (initial) deliveries */
3203 if (*argrest == 'i')
3205 queue_run_first_delivery = TRUE;
3209 /* -qf...: Run the queue, forcing deliveries
3210 -qff..: Ditto, forcing thawing as well */
3212 if (*argrest == 'f')
3214 queue_run_force = TRUE;
3215 if (*++argrest == 'f')
3217 deliver_force_thaw = TRUE;
3222 /* -q[f][f]l...: Run the queue only on local deliveries */
3224 if (*argrest == 'l')
3226 queue_run_local = TRUE;
3230 /* -q[f][f][l][G<name>]... Work on the named queue */
3232 if (*argrest == 'G')
3235 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3236 queue_name = string_copyn(argrest, i);
3238 if (*argrest == '/') argrest++;
3241 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3242 only, optionally named, optionally starting from a given message id. */
3244 if (*argrest == 0 &&
3245 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3248 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3249 start_queue_run_id = argv[++i];
3250 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3251 stop_queue_run_id = argv[++i];
3254 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3255 forced, optionally local only, optionally named. */
3257 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3260 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3266 case 'R': /* Synonymous with -qR... */
3267 receiving_message = FALSE;
3269 /* -Rf: As -R (below) but force all deliveries,
3270 -Rff: Ditto, but also thaw all frozen messages,
3271 -Rr: String is regex
3272 -Rrf: Regex and force
3273 -Rrff: Regex and force and thaw
3275 in all cases provided there are no further characters in this
3281 for (i = 0; i < nelem(rsopts); i++)
3282 if (Ustrcmp(argrest, rsopts[i]) == 0)
3284 if (i != 2) queue_run_force = TRUE;
3285 if (i >= 2) deliver_selectstring_regex = TRUE;
3286 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3287 argrest += Ustrlen(rsopts[i]);
3291 /* -R: Set string to match in addresses for forced queue run to
3292 pick out particular messages. */
3295 deliver_selectstring = argrest;
3296 else if (i+1 < argc)
3297 deliver_selectstring = argv[++i];
3300 fprintf(stderr, "exim: string expected after -R\n");
3306 /* -r: an obsolete synonym for -f (see above) */
3309 /* -S: Like -R but works on sender. */
3311 case 'S': /* Synonymous with -qS... */
3312 receiving_message = FALSE;
3314 /* -Sf: As -S (below) but force all deliveries,
3315 -Sff: Ditto, but also thaw all frozen messages,
3316 -Sr: String is regex
3317 -Srf: Regex and force
3318 -Srff: Regex and force and thaw
3320 in all cases provided there are no further characters in this
3326 for (i = 0; i < nelem(rsopts); i++)
3327 if (Ustrcmp(argrest, rsopts[i]) == 0)
3329 if (i != 2) queue_run_force = TRUE;
3330 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3331 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3332 argrest += Ustrlen(rsopts[i]);
3336 /* -S: Set string to match in addresses for forced queue run to
3337 pick out particular messages. */
3340 deliver_selectstring_sender = argrest;
3341 else if (i+1 < argc)
3342 deliver_selectstring_sender = argv[++i];
3345 fprintf(stderr, "exim: string expected after -S\n");
3350 /* -Tqt is an option that is exclusively for use by the testing suite.
3351 It is not recognized in other circumstances. It allows for the setting up
3352 of explicit "queue times" so that various warning/retry things can be
3353 tested. Otherwise variability of clock ticks etc. cause problems. */
3356 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3357 fudged_queue_times = argv[++i];
3362 /* -t: Set flag to extract recipients from body of message. */
3365 if (*argrest == 0) extract_recipients = TRUE;
3367 /* -ti: Set flag to extract recipients from body of message, and also
3368 specify that dot does not end the message. */
3370 else if (Ustrcmp(argrest, "i") == 0)
3372 extract_recipients = TRUE;
3376 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3379 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3386 /* -U: This means "initial user submission" in sendmail, apparently. The
3387 doc claims that in future sendmail may refuse syntactically invalid
3388 messages instead of fixing them. For the moment, we just ignore it. */
3394 /* -v: verify things - this is a very low-level debugging */
3399 debug_selector |= D_v;
3400 debug_file = stderr;
3406 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3408 The -x flag tells the sendmail command that mail from a local
3409 mail program has National Language Support (NLS) extended characters
3410 in the body of the mail item. The sendmail command can send mail with
3411 extended NLS characters across networks that normally corrupts these
3414 As Exim is 8-bit clean, it just ignores this flag. */
3417 if (*argrest != 0) badarg = TRUE;
3420 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3421 logs to that file. We swallow the parameter and otherwise ignore it. */
3424 if (*argrest == '\0')
3427 fprintf(stderr, "exim: string expected after -X\n");
3433 if (*argrest == '\0')
3434 if (++i < argc) log_oneline = argv[i]; else
3436 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
3441 /* All other initial characters are errors */
3446 } /* End of high-level switch statement */
3448 /* Failed to recognize the option, or syntax error */
3452 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3453 "option %s\n", arg);
3459 /* If -R or -S have been specified without -q, assume a single queue run. */
3461 if ( (deliver_selectstring || deliver_selectstring_sender)
3462 && queue_interval < 0)
3467 /* If usage_wanted is set we call the usage function - which never returns */
3468 if (usage_wanted) exim_usage(called_as);
3470 /* Arguments have been processed. Check for incompatibilities. */
3472 (smtp_input || extract_recipients || recipients_arg < argc) &&
3473 (daemon_listen || queue_interval >= 0 || bi_option ||
3474 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3475 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3478 msg_action_arg > 0 &&
3479 (daemon_listen || queue_interval > 0 || list_options ||
3480 (checking && msg_action != MSG_LOAD) ||
3481 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3484 (daemon_listen || queue_interval > 0) &&
3485 (sender_address != NULL || list_options || list_queue || checking ||
3489 daemon_listen && queue_interval == 0
3492 inetd_wait_mode && queue_interval >= 0
3496 (checking || smtp_input || extract_recipients ||
3497 filter_test != FTEST_NONE || bi_option)
3500 verify_address_mode &&
3501 (address_test_mode || smtp_input || extract_recipients ||
3502 filter_test != FTEST_NONE || bi_option)
3505 address_test_mode && (smtp_input || extract_recipients ||
3506 filter_test != FTEST_NONE || bi_option)
3509 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3513 deliver_selectstring != NULL && queue_interval < 0
3516 msg_action == MSG_LOAD &&
3517 (!expansion_test || expansion_test_message != NULL)
3521 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3525 /* If debugging is set up, set the file and the file descriptor to pass on to
3526 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3527 to run in the foreground. */
3529 if (debug_selector != 0)
3531 debug_file = stderr;
3532 debug_fd = fileno(debug_file);
3533 background_daemon = FALSE;
3534 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3535 if (debug_selector != D_v) /* -v only doesn't show this */
3537 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3538 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3540 if (!version_printed)
3541 show_whats_supported(stderr);
3545 /* When started with root privilege, ensure that the limits on the number of
3546 open files and the number of processes (where that is accessible) are
3547 sufficiently large, or are unset, in case Exim has been called from an
3548 environment where the limits are screwed down. Not all OS have the ability to
3549 change some of these limits. */
3553 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3559 #ifdef RLIMIT_NOFILE
3560 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3562 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3564 rlp.rlim_cur = rlp.rlim_max = 0;
3567 /* I originally chose 1000 as a nice big number that was unlikely to
3568 be exceeded. It turns out that some older OS have a fixed upper limit of
3571 if (rlp.rlim_cur < 1000)
3573 rlp.rlim_cur = rlp.rlim_max = 1000;
3574 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3576 rlp.rlim_cur = rlp.rlim_max = 256;
3577 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3578 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3585 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3587 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3589 rlp.rlim_cur = rlp.rlim_max = 0;
3592 #ifdef RLIM_INFINITY
3593 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3595 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3597 if (rlp.rlim_cur < 1000)
3599 rlp.rlim_cur = rlp.rlim_max = 1000;
3601 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3602 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3608 /* Exim is normally entered as root (but some special configurations are
3609 possible that don't do this). However, it always spins off sub-processes that
3610 set their uid and gid as required for local delivery. We don't want to pass on
3611 any extra groups that root may belong to, so we want to get rid of them all at
3614 We need to obey setgroups() at this stage, before possibly giving up root
3615 privilege for a changed configuration file, but later on we might need to
3616 check on the additional groups for the admin user privilege - can't do that
3617 till after reading the config, which might specify the exim gid. Therefore,
3618 save the group list here first. */
3620 group_count = getgroups(NGROUPS_MAX, group_list);
3621 if (group_count < 0)
3623 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3627 /* There is a fundamental difference in some BSD systems in the matter of
3628 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3629 known not to be different. On the "different" systems there is a single group
3630 list, and the first entry in it is the current group. On all other versions of
3631 Unix there is a supplementary group list, which is in *addition* to the current
3632 group. Consequently, to get rid of all extraneous groups on a "standard" system
3633 you pass over 0 groups to setgroups(), while on a "different" system you pass
3634 over a single group - the current group, which is always the first group in the
3635 list. Calling setgroups() with zero groups on a "different" system results in
3636 an error return. The following code should cope with both types of system.
3638 However, if this process isn't running as root, setgroups() can't be used
3639 since you have to be root to run it, even if throwing away groups. Not being
3640 root here happens only in some unusual configurations. We just ignore the
3643 if (setgroups(0, NULL) != 0)
3645 if (setgroups(1, group_list) != 0 && !unprivileged)
3647 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3652 /* If the configuration file name has been altered by an argument on the
3653 command line (either a new file name or a macro definition) and the caller is
3654 not root, or if this is a filter testing run, remove any setuid privilege the
3655 program has and run as the underlying user.
3657 The exim user is locked out of this, which severely restricts the use of -C
3660 Otherwise, set the real ids to the effective values (should be root unless run
3661 from inetd, which it can either be root or the exim uid, if one is configured).
3663 There is a private mechanism for bypassing some of this, in order to make it
3664 possible to test lots of configurations automatically, without having either to
3665 recompile each time, or to patch in an actual configuration file name and other
3666 values (such as the path name). If running in the test harness, pretend that
3667 configuration file changes and macro definitions haven't happened. */
3670 (!trusted_config || /* Config changed, or */
3671 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3672 real_uid != root_uid && /* Not root, and */
3673 !running_in_test_harness /* Not fudged */
3675 expansion_test /* expansion testing */
3677 filter_test != FTEST_NONE) /* Filter testing */
3679 setgroups(group_count, group_list);
3680 exim_setugid(real_uid, real_gid, FALSE,
3681 US"-C, -D, -be or -bf forces real uid");
3682 removed_privilege = TRUE;
3684 /* In the normal case when Exim is called like this, stderr is available
3685 and should be used for any logging information because attempts to write
3686 to the log will usually fail. To arrange this, we unset really_exim. However,
3687 if no stderr is available there is no point - we might as well have a go
3688 at the log (if it fails, syslog will be written).
3690 Note that if the invoker is Exim, the logs remain available. Messing with
3691 this causes unlogged successful deliveries. */
3693 if ((log_stderr != NULL) && (real_uid != exim_uid))
3694 really_exim = FALSE;
3697 /* Privilege is to be retained for the moment. It may be dropped later,
3698 depending on the job that this Exim process has been asked to do. For now, set
3699 the real uid to the effective so that subsequent re-execs of Exim are done by a
3702 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3704 /* If testing a filter, open the file(s) now, before wasting time doing other
3705 setups and reading the message. */
3707 if ((filter_test & FTEST_SYSTEM) != 0)
3709 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3712 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3714 return EXIT_FAILURE;
3718 if ((filter_test & FTEST_USER) != 0)
3720 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3723 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3725 return EXIT_FAILURE;
3729 /* Initialise lookup_list
3730 If debugging, already called above via version reporting.
3731 In either case, we initialise the list of available lookups while running
3732 as root. All dynamically modules are loaded from a directory which is
3733 hard-coded into the binary and is code which, if not a module, would be
3734 part of Exim already. Ability to modify the content of the directory
3735 is equivalent to the ability to modify a setuid binary!
3737 This needs to happen before we read the main configuration. */
3741 if (running_in_test_harness) smtputf8_advertise_hosts = NULL;
3744 /* Read the main runtime configuration data; this gives up if there
3745 is a failure. It leaves the configuration file open so that the subsequent
3746 configuration data for delivery can be read if needed.
3748 NOTE: immediatly after opening the configuration file we change the working
3749 directory to "/"! Later we change to $spool_directory. We do it there, because
3750 during readconf_main() some expansion takes place already. */
3752 /* Store the initial cwd before we change directories. Can be NULL if the
3753 dir has already been unlinked. */
3754 initial_cwd = os_getcwd(NULL, 0);
3757 -be[m] expansion test -
3758 -b[fF] filter test new
3760 -bmalware malware_test_file new
3762 -brw rewrite test new
3764 -bv[s] address verify -
3766 -bP <option> (except -bP config, which sets list_config)
3768 If any of these options is set, we suppress warnings about configuration
3769 issues (currently about tls_advertise_hosts and keep_environment not being
3772 readconf_main(checking || list_options);
3774 if (builtin_macros_create_trigger) DEBUG(D_any)
3775 debug_printf("Builtin macros created (expensive) due to config line '%.*s'\n",
3776 Ustrlen(builtin_macros_create_trigger)-1, builtin_macros_create_trigger);
3778 /* Now in directory "/" */
3780 if (cleanup_environment() == FALSE)
3781 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3784 /* If an action on specific messages is requested, or if a daemon or queue
3785 runner is being started, we need to know if Exim was called by an admin user.
3786 This is the case if the real user is root or exim, or if the real group is
3787 exim, or if one of the supplementary groups is exim or a group listed in
3788 admin_groups. We don't fail all message actions immediately if not admin_user,
3789 since some actions can be performed by non-admin users. Instead, set admin_user
3790 for later interrogation. */
3792 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3797 for (i = 0; i < group_count && !admin_user; i++)
3798 if (group_list[i] == exim_gid)
3800 else if (admin_groups)
3801 for (j = 1; j <= (int)admin_groups[0] && !admin_user; j++)
3802 if (admin_groups[j] == group_list[i])
3806 /* Another group of privileged users are the trusted users. These are root,
3807 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3808 are permitted to specify sender_addresses with -f on the command line, and
3809 other message parameters as well. */
3811 if (real_uid == root_uid || real_uid == exim_uid)
3812 trusted_caller = TRUE;
3818 for (i = 1; i <= (int)trusted_users[0] && !trusted_caller; i++)
3819 if (trusted_users[i] == real_uid)
3820 trusted_caller = TRUE;
3823 for (i = 1; i <= (int)trusted_groups[0] && !trusted_caller; i++)
3824 if (trusted_groups[i] == real_gid)
3825 trusted_caller = TRUE;
3826 else for (j = 0; j < group_count && !trusted_caller; j++)
3827 if (trusted_groups[i] == group_list[j])
3828 trusted_caller = TRUE;
3831 /* At this point, we know if the user is privileged and some command-line
3832 options become possibly impermissible, depending upon the configuration file. */
3834 if (checking && commandline_checks_require_admin && !admin_user) {
3835 fprintf(stderr, "exim: those command-line flags are set to require admin\n");
3839 /* Handle the decoding of logging options. */
3841 decode_bits(log_selector, log_selector_size, log_notall,
3842 log_selector_string, log_options, log_options_count, US"log", 0);
3847 debug_printf("configuration file is %s\n", config_main_filename);
3848 debug_printf("log selectors =");
3849 for (i = 0; i < log_selector_size; i++)
3850 debug_printf(" %08x", log_selector[i]);
3854 /* If domain literals are not allowed, check the sender address that was
3855 supplied with -f. Ditto for a stripped trailing dot. */
3857 if (sender_address != NULL)
3859 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3861 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3862 "allowed\n", sender_address);
3863 return EXIT_FAILURE;
3865 if (f_end_dot && !strip_trailing_dot)
3867 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3868 "(trailing dot not allowed)\n", sender_address);
3869 return EXIT_FAILURE;
3873 /* See if an admin user overrode our logging. */
3875 if (cmdline_syslog_name != NULL)
3879 syslog_processname = cmdline_syslog_name;
3880 log_file_path = string_copy(CUS"syslog");
3884 /* not a panic, non-privileged users should not be able to spam paniclog */
3886 "exim: you lack sufficient privilege to specify syslog process name\n");
3887 return EXIT_FAILURE;
3891 /* Paranoia check of maximum lengths of certain strings. There is a check
3892 on the length of the log file path in log.c, which will come into effect
3893 if there are any calls to write the log earlier than this. However, if we
3894 get this far but the string is very long, it is better to stop now than to
3895 carry on and (e.g.) receive a message and then have to collapse. The call to
3896 log_write() from here will cause the ultimate panic collapse if the complete
3897 file name exceeds the buffer length. */
3899 if (Ustrlen(log_file_path) > 200)
3900 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3901 "log_file_path is longer than 200 chars: aborting");
3903 if (Ustrlen(pid_file_path) > 200)
3904 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3905 "pid_file_path is longer than 200 chars: aborting");
3907 if (Ustrlen(spool_directory) > 200)
3908 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3909 "spool_directory is longer than 200 chars: aborting");
3911 /* Length check on the process name given to syslog for its TAG field,
3912 which is only permitted to be 32 characters or less. See RFC 3164. */
3914 if (Ustrlen(syslog_processname) > 32)
3915 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3916 "syslog_processname is longer than 32 chars: aborting");
3921 log_write(0, LOG_MAIN, "%s", log_oneline);
3922 return EXIT_SUCCESS;
3925 return EXIT_FAILURE;
3927 /* In some operating systems, the environment variable TMPDIR controls where
3928 temporary files are created; Exim doesn't use these (apart from when delivering
3929 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3930 If TMPDIR is found in the environment, reset it to the value defined in the
3931 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3932 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3933 EXIM_TMPDIR by the build scripts.
3939 if (environ) for (p = USS environ; *p; p++)
3940 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3942 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3943 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3945 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3950 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3951 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3952 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3953 called by a user who has set the TZ variable. This then affects the timestamps
3954 in log files and in Received: headers, and any created Date: header lines. The
3955 required timezone is settable in the configuration file, so nothing can be done
3956 about this earlier - but hopefully nothing will normally be logged earlier than
3957 this. We have to make a new environment if TZ is wrong, but don't bother if
3958 timestamps_utc is set, because then all times are in UTC anyway. */
3960 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3961 timestamps_utc = TRUE;
3964 uschar *envtz = US getenv("TZ");
3966 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3967 : timezone_string != NULL
3970 uschar **p = USS environ;
3974 if (environ) while (*p++) count++;
3975 if (!envtz) count++;
3976 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3977 if (environ) for (p = USS environ; *p; p++)
3978 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3979 if (timezone_string)
3981 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3982 sprintf(CS *newp++, "TZ=%s", timezone_string);
3987 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3988 tod_stamp(tod_log));
3992 /* Handle the case when we have removed the setuid privilege because of -C or
3993 -D. This means that the caller of Exim was not root.
3995 There is a problem if we were running as the Exim user. The sysadmin may
3996 expect this case to retain privilege because "the binary was called by the
3997 Exim user", but it hasn't, because either the -D option set macros, or the
3998 -C option set a non-trusted configuration file. There are two possibilities:
4000 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4001 to do message deliveries. Thus, the fact that it is running as a
4002 non-privileged user is plausible, and might be wanted in some special
4003 configurations. However, really_exim will have been set false when
4004 privilege was dropped, to stop Exim trying to write to its normal log
4005 files. Therefore, re-enable normal log processing, assuming the sysadmin
4006 has set up the log directory correctly.
4008 (2) If deliver_drop_privilege is not set, the configuration won't work as
4009 apparently intended, and so we log a panic message. In order to retain
4010 root for -C or -D, the caller must either be root or be invoking a
4011 trusted configuration file (when deliver_drop_privilege is false). */
4013 if ( removed_privilege
4014 && (!trusted_config || opt_D_used)
4015 && real_uid == exim_uid)
4016 if (deliver_drop_privilege)
4017 really_exim = TRUE; /* let logging work normally */
4019 log_write(0, LOG_MAIN|LOG_PANIC,
4020 "exim user lost privilege for using %s option",
4021 trusted_config? "-D" : "-C");
4023 /* Start up Perl interpreter if Perl support is configured and there is a
4024 perl_startup option, and the configuration or the command line specifies
4025 initializing starting. Note that the global variables are actually called
4026 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4029 if (perl_start_option != 0)
4030 opt_perl_at_start = (perl_start_option > 0);
4031 if (opt_perl_at_start && opt_perl_startup != NULL)
4034 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4035 errstr = init_perl(opt_perl_startup);
4038 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
4039 return EXIT_FAILURE;
4041 opt_perl_started = TRUE;
4043 #endif /* EXIM_PERL */
4045 /* Log the arguments of the call if the configuration file said so. This is
4046 a debugging feature for finding out what arguments certain MUAs actually use.
4047 Don't attempt it if logging is disabled, or if listing variables or if
4048 verifying/testing addresses or expansions. */
4050 if (((debug_selector & D_any) != 0 || LOGGING(arguments))
4051 && really_exim && !list_options && !checking)
4054 uschar *p = big_buffer;
4055 Ustrcpy(p, "cwd= (failed)");
4057 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4060 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4062 for (i = 0; i < argc; i++)
4064 int len = Ustrlen(argv[i]);
4065 const uschar *printing;
4067 if (p + len + 8 >= big_buffer + big_buffer_size)
4070 log_write(0, LOG_MAIN, "%s", big_buffer);
4071 Ustrcpy(big_buffer, "...");
4074 printing = string_printing(argv[i]);
4075 if (printing[0] == 0) quote = US"\""; else
4077 const uschar *pp = printing;
4079 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4081 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4082 (p - big_buffer) - 4), printing, quote);
4085 if (LOGGING(arguments))
4086 log_write(0, LOG_MAIN, "%s", big_buffer);
4088 debug_printf("%s\n", big_buffer);
4091 /* Set the working directory to be the top-level spool directory. We don't rely
4092 on this in the code, which always uses fully qualified names, but it's useful
4093 for core dumps etc. Don't complain if it fails - the spool directory might not
4094 be generally accessible and calls with the -C option (and others) have lost
4095 privilege by now. Before the chdir, we try to ensure that the directory exists.
4098 if (Uchdir(spool_directory) != 0)
4101 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4102 dummy = /* quieten compiler */ Uchdir(spool_directory);
4103 dummy = dummy; /* yet more compiler quietening, sigh */
4106 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4107 alias file. Exim doesn't have such a concept, but this call is screwed into
4108 Sun's YP makefiles. Handle this by calling a configured script, as the real
4109 user who called Exim. The -oA option can be used to pass an argument to the
4114 (void)fclose(config_file);
4115 if (bi_command != NULL)
4119 argv[i++] = bi_command;
4120 if (alias_arg != NULL) argv[i++] = alias_arg;
4123 setgroups(group_count, group_list);
4124 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4126 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4127 (argv[1] == NULL)? US"" : argv[1]);
4129 execv(CS argv[0], (char *const *)argv);
4130 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4135 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4140 /* We moved the admin/trusted check to be immediately after reading the
4141 configuration file. We leave these prints here to ensure that syslog setup,
4142 logfile setup, and so on has already happened. */
4144 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4145 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4147 /* Only an admin user may start the daemon or force a queue run in the default
4148 configuration, but the queue run restriction can be relaxed. Only an admin
4149 user may request that a message be returned to its sender forthwith. Only an
4150 admin user may specify a debug level greater than D_v (because it might show
4151 passwords, etc. in lookup queries). Only an admin user may request a queue
4152 count. Only an admin user can use the test interface to scan for email
4153 (because Exim will be in the spool dir and able to look at mails). */
4157 BOOL debugset = (debug_selector & ~D_v) != 0;
4158 if (deliver_give_up || daemon_listen || malware_test_file ||
4159 (count_queue && queue_list_requires_admin) ||
4160 (list_queue && queue_list_requires_admin) ||
4161 (queue_interval >= 0 && prod_requires_admin) ||
4162 (debugset && !running_in_test_harness))
4164 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4169 /* If the real user is not root or the exim uid, the argument for passing
4170 in an open TCP/IP connection for another message is not permitted, nor is
4171 running with the -N option for any delivery action, unless this call to exim is
4172 one that supplied an input message, or we are using a patched exim for
4173 regression testing. */
4175 if (real_uid != root_uid && real_uid != exim_uid &&
4176 (continue_hostname != NULL ||
4178 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4179 )) && !running_in_test_harness)
4181 fprintf(stderr, "exim: Permission denied\n");
4182 return EXIT_FAILURE;
4185 /* If the caller is not trusted, certain arguments are ignored when running for
4186 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4187 Note that authority for performing certain actions on messages is tested in the
4188 queue_action() function. */
4190 if (!trusted_caller && !checking)
4192 sender_host_name = sender_host_address = interface_address =
4193 sender_ident = received_protocol = NULL;
4194 sender_host_port = interface_port = 0;
4195 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4198 /* If a sender host address is set, extract the optional port number off the
4199 end of it and check its syntax. Do the same thing for the interface address.
4200 Exim exits if the syntax is bad. */
4204 if (sender_host_address != NULL)
4205 sender_host_port = check_port(sender_host_address);
4206 if (interface_address != NULL)
4207 interface_port = check_port(interface_address);
4210 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4215 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4216 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4220 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4221 return EXIT_FAILURE;
4225 /* If an SMTP message is being received check to see if the standard input is a
4226 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4227 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4232 union sockaddr_46 inetd_sock;
4233 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4234 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4236 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4237 if (family == AF_INET || family == AF_INET6)
4239 union sockaddr_46 interface_sock;
4240 size = sizeof(interface_sock);
4242 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4243 interface_address = host_ntoa(-1, &interface_sock, NULL,
4246 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4248 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4251 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4252 NULL, &sender_host_port);
4253 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4254 "inetd is not supported when mua_wrapper is set");
4259 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4260 return EXIT_FAILURE;
4266 /* If the load average is going to be needed while receiving a message, get it
4267 now for those OS that require the first call to os_getloadavg() to be done as
4268 root. There will be further calls later for each message received. */
4270 #ifdef LOAD_AVG_NEEDS_ROOT
4271 if (receiving_message &&
4272 (queue_only_load >= 0 ||
4273 (is_inetd && smtp_load_reserve >= 0)
4276 load_average = OS_GETLOADAVG();
4280 /* The queue_only configuration option can be overridden by -odx on the command
4281 line, except that if queue_only_override is false, queue_only cannot be unset
4282 from the command line. */
4284 if (queue_only_set && (queue_only_override || arg_queue_only))
4285 queue_only = arg_queue_only;
4287 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4290 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4291 if (arg_smtp_receive_timeout >= 0)
4292 smtp_receive_timeout = arg_smtp_receive_timeout;
4294 /* If Exim was started with root privilege, unless we have already removed the
4295 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4296 except when starting the daemon or doing some kind of delivery or address
4297 testing (-bt). These are the only cases when root need to be retained. We run
4298 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4299 retained only for starting the daemon. We always do the initgroups() in this
4300 situation (controlled by the TRUE below), in order to be as close as possible
4301 to the state Exim usually runs in. */
4303 if (!unprivileged && /* originally had root AND */
4304 !removed_privilege && /* still got root AND */
4305 !daemon_listen && /* not starting the daemon */
4306 queue_interval <= 0 && /* (either kind of daemon) */
4308 deliver_drop_privilege || /* requested unprivileged */
4310 queue_interval < 0 && /* not running the queue */
4311 (msg_action_arg < 0 || /* and */
4312 msg_action != MSG_DELIVER) && /* not delivering and */
4313 (!checking || !address_test_mode) /* not address checking */
4315 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4317 /* When we are retaining a privileged uid, we still change to the exim gid. */
4322 rv = setgid(exim_gid);
4323 /* Impact of failure is that some stuff might end up with an incorrect group.
4324 We track this for failures from root, since any attempt to change privilege
4325 by root should succeed and failures should be examined. For non-root,
4326 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4327 no need to complain then. */
4329 if (!(unprivileged || removed_privilege))
4332 "exim: changing group failed: %s\n", strerror(errno));
4336 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4337 (long int)exim_gid, strerror(errno));
4340 /* Handle a request to scan a file for malware */
4341 if (malware_test_file)
4343 #ifdef WITH_CONTENT_SCAN
4345 set_process_info("scanning file for malware");
4346 result = malware_in_file(malware_test_file);
4349 printf("No malware found.\n");
4354 printf("Malware lookup returned non-okay/fail: %d\n", result);
4358 printf("Malware found: %s\n", malware_name);
4360 printf("Malware scan detected malware of unknown name.\n");
4362 printf("Malware scanning not enabled at compile time.\n");
4367 /* Handle a request to list the delivery queue */
4371 set_process_info("listing the queue");
4372 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4376 /* Handle a request to count the delivery queue */
4380 set_process_info("counting the queue");
4385 /* Handle actions on specific messages, except for the force delivery and
4386 message load actions, which are done below. Some actions take a whole list of
4387 message ids, which are known to continue up to the end of the arguments. Others
4388 take a single message id and then operate on the recipients list. */
4390 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4392 int yield = EXIT_SUCCESS;
4393 set_process_info("acting on specified messages");
4395 if (!one_msg_action)
4397 for (i = msg_action_arg; i < argc; i++)
4398 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4399 yield = EXIT_FAILURE;
4402 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4403 recipients_arg)) yield = EXIT_FAILURE;
4407 /* We used to set up here to skip reading the ACL section, on
4408 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4409 Now, since the intro of the ${acl } expansion, ACL definitions may be
4410 needed in transports so we lost the optimisation. */
4414 /* The configuration data will have been read into POOL_PERM because we won't
4415 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4416 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4417 configuration were read into POOL_MAIN, because we don't do any resets till
4418 later on. However, it seems right, and it does ensure that both pools get used.
4421 store_pool = POOL_MAIN;
4423 /* Handle the -brt option. This is for checking out retry configurations.
4424 The next three arguments are a domain name or a complete address, and
4425 optionally two error numbers. All it does is to call the function that
4426 scans the retry configuration data. */
4428 if (test_retry_arg >= 0)
4430 retry_config *yield;
4431 int basic_errno = 0;
4435 if (test_retry_arg >= argc)
4437 printf("-brt needs a domain or address argument\n");
4438 exim_exit(EXIT_FAILURE, US"main");
4440 s1 = argv[test_retry_arg++];
4443 /* If the first argument contains no @ and no . it might be a local user
4444 or it might be a single-component name. Treat as a domain. */
4446 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4448 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4449 "being \ntreated as a one-component domain, not as a local part.\n\n",
4453 /* There may be an optional second domain arg. */
4455 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4456 s2 = argv[test_retry_arg++];
4458 /* The final arg is an error name */
4460 if (test_retry_arg < argc)
4462 uschar *ss = argv[test_retry_arg];
4464 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4467 printf("%s\n", CS error);
4468 return EXIT_FAILURE;
4471 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4472 code > 100 as an error is for matching codes to the decade. Turn them into
4473 a real error code, off the decade. */
4475 if (basic_errno == ERRNO_MAIL4XX ||
4476 basic_errno == ERRNO_RCPT4XX ||
4477 basic_errno == ERRNO_DATA4XX)
4479 int code = (more_errno >> 8) & 255;
4481 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4482 else if (code > 100)
4483 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4487 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4488 printf("No retry information found\n");
4492 more_errno = yield->more_errno;
4493 printf("Retry rule: %s ", yield->pattern);
4495 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4497 printf("quota%s%s ",
4498 (more_errno > 0)? "_" : "",
4499 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4501 else if (yield->basic_errno == ECONNREFUSED)
4503 printf("refused%s%s ",
4504 (more_errno > 0)? "_" : "",
4505 (more_errno == 'M')? "MX" :
4506 (more_errno == 'A')? "A" : "");
4508 else if (yield->basic_errno == ETIMEDOUT)
4511 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4513 if (more_errno != 0) printf("_%s",
4514 (more_errno == 'M')? "MX" : "A");
4517 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4518 printf("auth_failed ");
4521 for (r = yield->rules; r; r = r->next)
4523 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4524 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4530 printf(",%d.", x/1000);
4544 exim_exit(EXIT_SUCCESS, US"main");
4547 /* Handle a request to list one or more configuration options */
4548 /* If -n was set, we suppress some information */
4552 set_process_info("listing variables");
4553 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4554 else for (i = recipients_arg; i < argc; i++)
4557 (Ustrcmp(argv[i], "router") == 0 ||
4558 Ustrcmp(argv[i], "transport") == 0 ||
4559 Ustrcmp(argv[i], "authenticator") == 0 ||
4560 Ustrcmp(argv[i], "macro") == 0 ||
4561 Ustrcmp(argv[i], "environment") == 0))
4563 readconf_print(argv[i+1], argv[i], flag_n);
4566 else readconf_print(argv[i], NULL, flag_n);
4568 exim_exit(EXIT_SUCCESS, US"main");
4573 set_process_info("listing config");
4574 readconf_print(US"config", NULL, flag_n);
4575 exim_exit(EXIT_SUCCESS, US"main");
4579 /* Initialise subsystems as required */
4580 #ifndef DISABLE_DKIM
4586 /* Handle a request to deliver one or more messages that are already on the
4587 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4588 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4590 Delivery of specific messages is typically used for a small number when
4591 prodding by hand (when the option forced_delivery will be set) or when
4592 re-execing to regain root privilege. Each message delivery must happen in a
4593 separate process, so we fork a process for each one, and run them sequentially
4594 so that debugging output doesn't get intertwined, and to avoid spawning too
4595 many processes if a long list is given. However, don't fork for the last one;
4596 this saves a process in the common case when Exim is called to deliver just one
4599 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4601 if (prod_requires_admin && !admin_user)
4603 fprintf(stderr, "exim: Permission denied\n");
4604 exim_exit(EXIT_FAILURE, US"main");
4606 set_process_info("delivering specified messages");
4607 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4608 for (i = msg_action_arg; i < argc; i++)
4613 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4614 else if ((pid = fork()) == 0)
4616 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4617 _exit(EXIT_SUCCESS);
4621 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4623 exim_exit(EXIT_FAILURE, US"main");
4627 exim_exit(EXIT_SUCCESS, US"main");
4631 /* If only a single queue run is requested, without SMTP listening, we can just
4632 turn into a queue runner, with an optional starting message id. */
4634 if (queue_interval == 0 && !daemon_listen)
4636 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4637 (start_queue_run_id == NULL)? US"" : US" starting at ",
4638 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4639 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4640 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4642 set_process_info("running the '%s' queue (single queue run)", queue_name);
4644 set_process_info("running the queue (single queue run)");
4645 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4646 exim_exit(EXIT_SUCCESS, US"main");
4650 /* Find the login name of the real user running this process. This is always
4651 needed when receiving a message, because it is written into the spool file. It
4652 may also be used to construct a from: or a sender: header, and in this case we
4653 need the user's full name as well, so save a copy of it, checked for RFC822
4654 syntax and munged if necessary, if it hasn't previously been set by the -F
4655 argument. We may try to get the passwd entry more than once, in case NIS or
4656 other delays are in evidence. Save the home directory for use in filter testing
4661 if ((pw = getpwuid(real_uid)) != NULL)
4663 originator_login = string_copy(US pw->pw_name);
4664 originator_home = string_copy(US pw->pw_dir);
4666 /* If user name has not been set by -F, set it from the passwd entry
4667 unless -f has been used to set the sender address by a trusted user. */
4669 if (!originator_name)
4671 if (!sender_address || (!trusted_caller && filter_test == FTEST_NONE))
4673 uschar *name = US pw->pw_gecos;
4674 uschar *amp = Ustrchr(name, '&');
4677 /* Most Unix specify that a '&' character in the gecos field is
4678 replaced by a copy of the login name, and some even specify that
4679 the first character should be upper cased, so that's what we do. */
4684 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4685 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4686 buffer[loffset] = toupper(buffer[loffset]);
4690 /* If a pattern for matching the gecos field was supplied, apply
4691 it and then expand the name string. */
4693 if (gecos_pattern && gecos_name)
4696 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4698 if (regex_match_and_setup(re, name, 0, -1))
4700 uschar *new_name = expand_string(gecos_name);
4704 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4705 "gecos field \"%s\"\n", new_name, name);
4708 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4709 "\"%s\": %s\n", gecos_name, expand_string_message);
4711 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4712 "gecos field \"%s\"\n", gecos_pattern, name);
4713 store_free((void *)re);
4715 originator_name = string_copy(name);
4718 /* A trusted caller has used -f but not -F */
4720 else originator_name = US"";
4723 /* Break the retry loop */
4728 if (++i > finduser_retries) break;
4732 /* If we cannot get a user login, log the incident and give up, unless the
4733 configuration specifies something to use. When running in the test harness,
4734 any setting of unknown_login overrides the actual name. */
4736 if (originator_login == NULL || running_in_test_harness)
4738 if (unknown_login != NULL)
4740 originator_login = expand_string(unknown_login);
4741 if (originator_name == NULL && unknown_username != NULL)
4742 originator_name = expand_string(unknown_username);
4743 if (originator_name == NULL) originator_name = US"";
4745 if (originator_login == NULL)
4746 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4750 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4753 originator_name = string_copy(parse_fix_phrase(originator_name,
4754 Ustrlen(originator_name), big_buffer, big_buffer_size));
4756 /* If a message is created by this call of Exim, the uid/gid of its originator
4757 are those of the caller. These values are overridden if an existing message is
4758 read in from the spool. */
4760 originator_uid = real_uid;
4761 originator_gid = real_gid;
4763 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4764 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4766 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4767 returns. We leave this till here so that the originator_ fields are available
4768 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4771 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4775 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4776 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4777 "mua_wrapper is set");
4782 /* If the sender ident has not been set (by a trusted caller) set it to
4783 the caller. This will get overwritten below for an inetd call. If a trusted
4784 caller has set it empty, unset it. */
4786 if (sender_ident == NULL) sender_ident = originator_login;
4787 else if (sender_ident[0] == 0) sender_ident = NULL;
4789 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4790 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4791 originator_* variables set. */
4793 if (test_rewrite_arg >= 0)
4795 really_exim = FALSE;
4796 if (test_rewrite_arg >= argc)
4798 printf("-brw needs an address argument\n");
4799 exim_exit(EXIT_FAILURE, US"main");
4801 rewrite_test(argv[test_rewrite_arg]);
4802 exim_exit(EXIT_SUCCESS, US"main");
4805 /* A locally-supplied message is considered to be coming from a local user
4806 unless a trusted caller supplies a sender address with -f, or is passing in the
4807 message via SMTP (inetd invocation or otherwise). */
4809 if ((sender_address == NULL && !smtp_input) ||
4810 (!trusted_caller && filter_test == FTEST_NONE))
4812 sender_local = TRUE;
4814 /* A trusted caller can supply authenticated_sender and authenticated_id
4815 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4816 defaults except when host checking. */
4818 if (authenticated_sender == NULL && !host_checking)
4819 authenticated_sender = string_sprintf("%s@%s", originator_login,
4820 qualify_domain_sender);
4821 if (authenticated_id == NULL && !host_checking)
4822 authenticated_id = originator_login;
4825 /* Trusted callers are always permitted to specify the sender address.
4826 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4827 is specified is the empty address. However, if a trusted caller does not
4828 specify a sender address for SMTP input, we leave sender_address unset. This
4829 causes the MAIL commands to be honoured. */
4831 if ((!smtp_input && sender_address == NULL) ||
4832 !receive_check_set_sender(sender_address))
4834 /* Either the caller is not permitted to set a general sender, or this is
4835 non-SMTP input and the trusted caller has not set a sender. If there is no
4836 sender, or if a sender other than <> is set, override with the originator's
4837 login (which will get qualified below), except when checking things. */
4839 if (sender_address == NULL /* No sender_address set */
4841 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4842 !checking)) /* Not running tests, including filter tests */
4844 sender_address = originator_login;
4845 sender_address_forced = FALSE;
4846 sender_address_domain = 0;
4850 /* Remember whether an untrusted caller set the sender address */
4852 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4854 /* Ensure that the sender address is fully qualified unless it is the empty
4855 address, which indicates an error message, or doesn't exist (root caller, smtp
4856 interface, no -f argument). */
4858 if (sender_address != NULL && sender_address[0] != 0 &&
4859 sender_address_domain == 0)
4860 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4861 qualify_domain_sender);
4863 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4865 /* Handle a request to verify a list of addresses, or test them for delivery.
4866 This must follow the setting of the sender address, since routers can be
4867 predicated upon the sender. If no arguments are given, read addresses from
4868 stdin. Set debug_level to at least D_v to get full output for address testing.
4871 if (verify_address_mode || address_test_mode)
4874 int flags = vopt_qualify;
4876 if (verify_address_mode)
4878 if (!verify_as_sender) flags |= vopt_is_recipient;
4879 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4884 flags |= vopt_is_recipient;
4885 debug_selector |= D_v;
4886 debug_file = stderr;
4887 debug_fd = fileno(debug_file);
4888 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4891 if (recipients_arg < argc)
4893 while (recipients_arg < argc)
4895 uschar *s = argv[recipients_arg++];
4898 BOOL finished = FALSE;
4899 uschar *ss = parse_find_address_end(s, FALSE);
4900 if (*ss == ',') *ss = 0; else finished = TRUE;
4901 test_address(s, flags, &exit_value);
4904 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4911 uschar *s = get_stdinput(NULL, NULL);
4912 if (s == NULL) break;
4913 test_address(s, flags, &exit_value);
4917 exim_exit(exit_value, US"main");
4920 /* Handle expansion checking. Either expand items on the command line, or read
4921 from stdin if there aren't any. If -Mset was specified, load the message so
4922 that its variables can be used, but restrict this facility to admin users.
4923 Otherwise, if -bem was used, read a message from stdin. */
4927 dns_init(FALSE, FALSE, FALSE);
4928 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4930 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4933 fprintf(stderr, "exim: permission denied\n");
4936 message_id = argv[msg_action_arg];
4937 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4938 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4939 printf ("Failed to load message datafile %s\n", message_id);
4940 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4941 printf ("Failed to load message %s\n", message_id);
4944 /* Read a test message from a file. We fudge it up to be on stdin, saving
4945 stdin itself for later reading of expansion strings. */
4947 else if (expansion_test_message)
4949 int save_stdin = dup(0);
4950 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4953 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4955 return EXIT_FAILURE;
4958 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4959 message_ended = END_NOTENDED;
4960 read_message_body(receive_msg(extract_recipients));
4961 message_linecount += body_linecount;
4962 (void)dup2(save_stdin, 0);
4963 (void)close(save_stdin);
4964 clearerr(stdin); /* Required by Darwin */
4967 /* Only admin users may see config-file macros this way */
4969 if (!admin_user) macros = mlast = NULL;
4971 /* Allow $recipients for this testing */
4973 enable_dollar_recipients = TRUE;
4975 /* Expand command line items */
4977 if (recipients_arg < argc)
4978 while (recipients_arg < argc)
4979 expansion_test_line(argv[recipients_arg++]);
4985 char *(*fn_readline)(const char *) = NULL;
4986 void (*fn_addhist)(const char *) = NULL;
4990 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4993 while (s = get_stdinput(fn_readline, fn_addhist))
4994 expansion_test_line(s);
4997 if (dlhandle) dlclose(dlhandle);
5001 /* The data file will be open after -Mset */
5003 if (deliver_datafile >= 0)
5005 (void)close(deliver_datafile);
5006 deliver_datafile = -1;
5009 exim_exit(EXIT_SUCCESS, US"main: expansion test");
5013 /* The active host name is normally the primary host name, but it can be varied
5014 for hosts that want to play several parts at once. We need to ensure that it is
5015 set for host checking, and for receiving messages. */
5017 smtp_active_hostname = primary_hostname;
5018 if (raw_active_hostname != NULL)
5020 uschar *nah = expand_string(raw_active_hostname);
5023 if (!expand_string_forcedfail)
5024 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5025 "(smtp_active_hostname): %s", raw_active_hostname,
5026 expand_string_message);
5028 else if (nah[0] != 0) smtp_active_hostname = nah;
5031 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5032 given IP address so that the blocking and relay configuration can be tested.
5033 Unless a sender_ident was set by -oMt, we discard it (the default is the
5034 caller's login name). An RFC 1413 call is made only if we are running in the
5035 test harness and an incoming interface and both ports are specified, because
5036 there is no TCP/IP call to find the ident for. */
5043 if (!sender_ident_set)
5045 sender_ident = NULL;
5046 if (running_in_test_harness && sender_host_port != 0 &&
5047 interface_address != NULL && interface_port != 0)
5048 verify_get_ident(1413);
5051 /* In case the given address is a non-canonical IPv6 address, canonicalize
5052 it. The code works for both IPv4 and IPv6, as it happens. */
5054 size = host_aton(sender_host_address, x);
5055 sender_host_address = store_get(48); /* large enough for full IPv6 */
5056 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5058 /* Now set up for testing */
5060 host_build_sender_fullhost();
5064 sender_local = FALSE;
5065 sender_host_notsocket = TRUE;
5066 debug_file = stderr;
5067 debug_fd = fileno(debug_file);
5068 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5069 "**** but without any ident (RFC 1413) callback.\n"
5070 "**** This is not for real!\n\n",
5071 sender_host_address);
5073 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5074 if (verify_check_host(&hosts_connection_nolog) == OK)
5075 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5076 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5078 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5079 because a log line has already been written for all its failure exists
5080 (usually "connection refused: <reason>") and writing another one is
5081 unnecessary clutter. */
5083 if (smtp_start_session())
5085 for (reset_point = store_get(0); ; store_reset(reset_point))
5087 if (smtp_setup_msg() <= 0) break;
5088 if (!receive_msg(FALSE)) break;
5090 return_path = sender_address = NULL;
5091 dnslist_domain = dnslist_matched = NULL;
5092 #ifndef DISABLE_DKIM
5093 dkim_cur_signer = NULL;
5096 deliver_localpart_orig = NULL;
5097 deliver_domain_orig = NULL;
5098 callout_address = sending_ip_address = NULL;
5099 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5103 exim_exit(EXIT_SUCCESS, US"main");
5107 /* Arrange for message reception if recipients or SMTP were specified;
5108 otherwise complain unless a version print (-bV) happened or this is a filter
5109 verification test or info dump.
5110 In the former case, show the configuration file name. */
5112 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5114 if (version_printed)
5116 printf("Configuration file is %s\n", config_main_filename);
5117 return EXIT_SUCCESS;
5120 if (info_flag != CMDINFO_NONE)
5122 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5123 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5126 if (filter_test == FTEST_NONE)
5127 exim_usage(called_as);
5131 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5132 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5133 that we are not called from inetd, because that is rejected above. The
5134 following configuration settings are forced here:
5136 (1) Synchronous delivery (-odi)
5137 (2) Errors to stderr (-oep == -oeq)
5138 (3) No parallel remote delivery
5139 (4) Unprivileged delivery
5141 We don't force overall queueing options because there are several of them;
5142 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5143 to override any SMTP queueing. */
5147 synchronous_delivery = TRUE;
5148 arg_error_handling = ERRORS_STDERR;
5149 remote_max_parallel = 1;
5150 deliver_drop_privilege = TRUE;
5152 queue_smtp_domains = NULL;
5154 message_utf8_downconvert = -1; /* convert-if-needed */
5159 /* Prepare to accept one or more new messages on the standard input. When a
5160 message has been read, its id is returned in message_id[]. If doing immediate
5161 delivery, we fork a delivery process for each received message, except for the
5162 last one, where we can save a process switch.
5164 It is only in non-smtp mode that error_handling is allowed to be changed from
5165 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5166 sendmail error modes other than -oem ever actually used? Later: yes.) */
5168 if (!smtp_input) error_handling = arg_error_handling;
5170 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5171 logging being sent down the socket and make an identd call to get the
5176 (void)fclose(stderr);
5177 exim_nullstd(); /* Re-open to /dev/null */
5178 verify_get_ident(IDENT_PORT);
5179 host_build_sender_fullhost();
5180 set_process_info("handling incoming connection from %s via inetd",
5184 /* If the sender host address has been set, build sender_fullhost if it hasn't
5185 already been done (which it will have been for inetd). This caters for the
5186 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5187 so that the test for IP options is skipped for -bs input. */
5189 if (sender_host_address != NULL && sender_fullhost == NULL)
5191 host_build_sender_fullhost();
5192 set_process_info("handling incoming connection from %s via -oMa",
5194 sender_host_notsocket = TRUE;
5197 /* Otherwise, set the sender host as unknown except for inetd calls. This
5198 prevents host checking in the case of -bs not from inetd and also for -bS. */
5200 else if (!is_inetd) sender_host_unknown = TRUE;
5202 /* If stdout does not exist, then dup stdin to stdout. This can happen
5203 if exim is started from inetd. In this case fd 0 will be set to the socket,
5204 but fd 1 will not be set. This also happens for passed SMTP channels. */
5206 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5208 /* Set up the incoming protocol name and the state of the program. Root is
5209 allowed to force received protocol via the -oMr option above. If we have come
5210 via inetd, the process info has already been set up. We don't set
5211 received_protocol here for smtp input, as it varies according to
5212 batch/HELO/EHLO/AUTH/TLS. */
5216 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5217 smtp_batched_input? "batched " : "",
5218 (sender_address!= NULL)? sender_address : originator_login);
5222 int old_pool = store_pool;
5223 store_pool = POOL_PERM;
5224 if (!received_protocol)
5225 received_protocol = string_sprintf("local%s", called_as);
5226 store_pool = old_pool;
5227 set_process_info("accepting a local non-SMTP message from <%s>",
5231 /* Initialize the session_local_queue-only flag (this will be ignored if
5232 mua_wrapper is set) */
5235 session_local_queue_only = queue_only;
5237 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5238 the spool if so configured. On failure, we must not attempt to send an error
5239 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5240 error code is given.) */
5242 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5244 fprintf(stderr, "exim: insufficient disk space\n");
5245 return EXIT_FAILURE;
5248 /* If this is smtp input of any kind, real or batched, handle the start of the
5251 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5252 because a log line has already been written for all its failure exists
5253 (usually "connection refused: <reason>") and writing another one is
5254 unnecessary clutter. */
5260 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5261 if (verify_check_host(&hosts_connection_nolog) == OK)
5262 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5263 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5264 if (!smtp_start_session())
5267 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5271 /* Otherwise, set up the input size limit here. */
5275 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5276 if (expand_string_message)
5277 if (thismessage_size_limit == -1)
5278 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5279 "message_size_limit: %s", expand_string_message);
5281 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5282 "message_size_limit: %s", expand_string_message);
5285 /* Loop for several messages when reading SMTP input. If we fork any child
5286 processes, we don't want to wait for them unless synchronous delivery is
5287 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5288 same as SIG_DFL, despite the fact that documentation often lists the default as
5289 "ignore". This is a confusing area. This is what I know:
5291 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5292 processes that complete simply to go away without ever becoming defunct. You
5293 can't then wait for them - but we don't want to wait for them in the
5294 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5295 happen for all OS (e.g. *BSD is different).
5297 But that's not the end of the story. Some (many? all?) systems have the
5298 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5299 has by default, so it seems that the difference is merely one of default
5300 (compare restarting vs non-restarting signals).
5302 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5303 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5304 of the loop below. Paranoia rules.
5306 February 2003: That's *still* not the end of the story. There are now versions
5307 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5308 process then calls waitpid(), a grumble is written to the system log, because
5309 this is logically inconsistent. In other words, it doesn't like the paranoia.
5310 As a consequence of this, the waitpid() below is now excluded if we are sure
5311 that SIG_IGN works. */
5313 if (!synchronous_delivery)
5316 struct sigaction act;
5317 act.sa_handler = SIG_IGN;
5318 sigemptyset(&(act.sa_mask));
5319 act.sa_flags = SA_NOCLDWAIT;
5320 sigaction(SIGCHLD, &act, NULL);
5322 signal(SIGCHLD, SIG_IGN);
5326 /* Save the current store pool point, for resetting at the start of
5327 each message, and save the real sender address, if any. */
5329 reset_point = store_get(0);
5330 real_sender_address = sender_address;
5332 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5333 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5340 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5341 input and build the recipients list, before calling receive_msg() to read the
5342 message proper. Whatever sender address is given in the SMTP transaction is
5343 often ignored for local senders - we use the actual sender, which is normally
5344 either the underlying user running this process or a -f argument provided by
5345 a trusted caller. It is saved in real_sender_address. The test for whether to
5346 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5351 if ((rc = smtp_setup_msg()) > 0)
5353 if (real_sender_address != NULL &&
5354 !receive_check_set_sender(sender_address))
5356 sender_address = raw_sender = real_sender_address;
5357 sender_address_unrewritten = NULL;
5360 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5361 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5362 the very end. The result of the ACL is ignored (as for other non-SMTP
5363 messages). It is run for its potential side effects. */
5365 if (smtp_batched_input && acl_not_smtp_start != NULL)
5367 uschar *user_msg, *log_msg;
5368 enable_dollar_recipients = TRUE;
5369 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5370 &user_msg, &log_msg);
5371 enable_dollar_recipients = FALSE;
5374 /* Now get the data for the message */
5376 more = receive_msg(extract_recipients);
5377 if (message_id[0] == 0)
5379 cancel_cutthrough_connection(TRUE, US"receive dropped");
5380 if (more) goto moreloop;
5381 smtp_log_no_mail(); /* Log no mail if configured */
5382 exim_exit(EXIT_FAILURE, US"receive toplevel");
5387 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5388 smtp_log_no_mail(); /* Log no mail if configured */
5389 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5393 /* In the non-SMTP case, we have all the information from the command
5394 line, but must process it in case it is in the more general RFC822
5395 format, and in any case, to detect syntax errors. Also, it appears that
5396 the use of comma-separated lists as single arguments is common, so we
5397 had better support them. */
5403 int count = argc - recipients_arg;
5404 uschar **list = argv + recipients_arg;
5406 /* These options cannot be changed dynamically for non-SMTP messages */
5408 active_local_sender_retain = local_sender_retain;
5409 active_local_from_check = local_from_check;
5411 /* Save before any rewriting */
5413 raw_sender = string_copy(sender_address);
5415 /* Loop for each argument */
5417 for (i = 0; i < count; i++)
5419 int start, end, domain;
5421 uschar *s = list[i];
5423 /* Loop for each comma-separated address */
5427 BOOL finished = FALSE;
5429 uschar *ss = parse_find_address_end(s, FALSE);
5431 if (*ss == ',') *ss = 0; else finished = TRUE;
5433 /* Check max recipients - if -t was used, these aren't recipients */
5435 if (recipients_max > 0 && ++rcount > recipients_max &&
5436 !extract_recipients)
5437 if (error_handling == ERRORS_STDERR)
5439 fprintf(stderr, "exim: too many recipients\n");
5440 exim_exit(EXIT_FAILURE, US"main");
5444 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5445 errors_sender_rc : EXIT_FAILURE;
5449 BOOL b = allow_utf8_domains;
5450 allow_utf8_domains = TRUE;
5453 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5456 if (string_is_utf8(recipient))
5457 message_smtputf8 = TRUE;
5459 allow_utf8_domains = b;
5462 if (domain == 0 && !allow_unqualified_recipient)
5465 errmess = US"unqualified recipient address not allowed";
5468 if (recipient == NULL)
5470 if (error_handling == ERRORS_STDERR)
5472 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5473 string_printing(list[i]), errmess);
5474 exim_exit(EXIT_FAILURE, US"main");
5480 eblock.text1 = string_printing(list[i]);
5481 eblock.text2 = errmess;
5483 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5484 errors_sender_rc : EXIT_FAILURE;
5488 receive_add_recipient(recipient, -1);
5491 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5495 /* Show the recipients when debugging */
5500 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5501 if (recipients_list != NULL)
5503 debug_printf("Recipients:\n");
5504 for (i = 0; i < recipients_count; i++)
5505 debug_printf(" %s\n", recipients_list[i].address);
5509 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5510 ignored; rejecting here would just add complication, and it can just as
5511 well be done later. Allow $recipients to be visible in the ACL. */
5513 if (acl_not_smtp_start)
5515 uschar *user_msg, *log_msg;
5516 enable_dollar_recipients = TRUE;
5517 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5518 &user_msg, &log_msg);
5519 enable_dollar_recipients = FALSE;
5522 /* Pause for a while waiting for input. If none received in that time,
5523 close the logfile, if we had one open; then if we wait for a long-running
5524 datasource (months, in one use-case) log rotation will not leave us holding
5527 if (!receive_timeout)
5529 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5532 FD_ZERO(&r); FD_SET(0, &r);
5533 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5536 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5537 will just read the headers for the message, and not write anything onto the
5540 message_ended = END_NOTENDED;
5541 more = receive_msg(extract_recipients);
5543 /* more is always FALSE here (not SMTP message) when reading a message
5544 for real; when reading the headers of a message for filter testing,
5545 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5547 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5548 } /* Non-SMTP message reception */
5550 /* If this is a filter testing run, there are headers in store, but
5551 no message on the spool. Run the filtering code in testing mode, setting
5552 the domain to the qualify domain and the local part to the current user,
5553 unless they have been set by options. The prefix and suffix are left unset
5554 unless specified. The the return path is set to to the sender unless it has
5555 already been set from a return-path header in the message. */
5557 if (filter_test != FTEST_NONE)
5559 deliver_domain = (ftest_domain != NULL)?
5560 ftest_domain : qualify_domain_recipient;
5561 deliver_domain_orig = deliver_domain;
5562 deliver_localpart = (ftest_localpart != NULL)?
5563 ftest_localpart : originator_login;
5564 deliver_localpart_orig = deliver_localpart;
5565 deliver_localpart_prefix = ftest_prefix;
5566 deliver_localpart_suffix = ftest_suffix;
5567 deliver_home = originator_home;
5569 if (return_path == NULL)
5571 printf("Return-path copied from sender\n");
5572 return_path = string_copy(sender_address);
5575 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5576 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5578 receive_add_recipient(
5579 string_sprintf("%s%s%s@%s",
5580 (ftest_prefix == NULL)? US"" : ftest_prefix,
5582 (ftest_suffix == NULL)? US"" : ftest_suffix,
5583 deliver_domain), -1);
5585 printf("Recipient = %s\n", recipients_list[0].address);
5586 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5587 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5589 if (chdir("/")) /* Get away from wherever the user is running this from */
5591 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5592 exim_exit(EXIT_FAILURE, US"main");
5595 /* Now we run either a system filter test, or a user filter test, or both.
5596 In the latter case, headers added by the system filter will persist and be
5597 available to the user filter. We need to copy the filter variables
5600 if ((filter_test & FTEST_SYSTEM) != 0)
5601 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5602 exim_exit(EXIT_FAILURE, US"main");
5604 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5606 if ((filter_test & FTEST_USER) != 0)
5607 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5608 exim_exit(EXIT_FAILURE, US"main");
5610 exim_exit(EXIT_SUCCESS, US"main");
5613 /* Else act on the result of message reception. We should not get here unless
5614 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5615 will be TRUE. If it is not, check on the number of messages received in this
5618 if (!session_local_queue_only &&
5619 smtp_accept_queue_per_connection > 0 &&
5620 receive_messagecount > smtp_accept_queue_per_connection)
5622 session_local_queue_only = TRUE;
5623 queue_only_reason = 2;
5626 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5627 and queue_only_load is set, check that the load average is below it. If it is
5628 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5629 default), we put the whole session into queue_only mode. It then remains this
5630 way for any subsequent messages on the same SMTP connection. This is a
5631 deliberate choice; even though the load average may fall, it doesn't seem
5632 right to deliver later messages on the same call when not delivering earlier
5633 ones. However, there are odd cases where this is not wanted, so this can be
5634 changed by setting queue_only_load_latch false. */
5636 local_queue_only = session_local_queue_only;
5637 if (!local_queue_only && queue_only_load >= 0)
5639 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5640 if (local_queue_only)
5642 queue_only_reason = 3;
5643 if (queue_only_load_latch) session_local_queue_only = TRUE;
5647 /* If running as an MUA wrapper, all queueing options and freezing options
5651 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5653 /* Log the queueing here, when it will get a message id attached, but
5654 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5657 if (local_queue_only)
5659 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5660 switch(queue_only_reason)
5663 log_write(L_delay_delivery,
5664 LOG_MAIN, "no immediate delivery: more than %d messages "
5665 "received in one connection", smtp_accept_queue_per_connection);
5669 log_write(L_delay_delivery,
5670 LOG_MAIN, "no immediate delivery: load average %.2f",
5671 (double)load_average/1000.0);
5676 else if (queue_only_policy || deliver_freeze)
5677 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5679 /* Else do the delivery unless the ACL or local_scan() called for queue only
5680 or froze the message. Always deliver in a separate process. A fork failure is
5681 not a disaster, as the delivery will eventually happen on a subsequent queue
5682 run. The search cache must be tidied before the fork, as the parent will
5683 do it before exiting. The child will trigger a lookup failure and
5684 thereby defer the delivery if it tries to use (for example) a cached ldap
5685 connection that the parent has called unbind on. */
5692 if ((pid = fork()) == 0)
5695 close_unwanted(); /* Close unwanted file descriptors and TLS */
5696 exim_nullstd(); /* Ensure std{in,out,err} exist */
5698 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5699 mode, deliver_drop_privilege is forced TRUE). */
5701 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5703 delivery_re_exec(CEE_EXEC_EXIT);
5704 /* Control does not return here. */
5707 /* No need to re-exec */
5709 rc = deliver_message(message_id, FALSE, FALSE);
5711 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5712 EXIT_SUCCESS : EXIT_FAILURE);
5717 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5718 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5719 "process: %s", strerror(errno));
5723 release_cutthrough_connection(US"msg passed for delivery");
5725 /* In the parent, wait if synchronous delivery is required. This will
5726 always be the case in MUA wrapper mode. */
5728 if (synchronous_delivery)
5731 while (wait(&status) != pid);
5732 if ((status & 0x00ff) != 0)
5733 log_write(0, LOG_MAIN|LOG_PANIC,
5734 "process %d crashed with signal %d while delivering %s",
5735 (int)pid, status & 0x00ff, message_id);
5736 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5741 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5742 automatically reaps children (see comments above the loop), clear away any
5743 finished subprocesses here, in case there are lots of messages coming in
5744 from the same source. */
5746 #ifndef SIG_IGN_WORKS
5747 while (waitpid(-1, NULL, WNOHANG) > 0);
5751 return_path = sender_address = NULL;
5752 authenticated_sender = NULL;
5753 deliver_localpart_orig = NULL;
5754 deliver_domain_orig = NULL;
5755 deliver_host = deliver_host_address = NULL;
5756 dnslist_domain = dnslist_matched = NULL;
5757 #ifdef WITH_CONTENT_SCAN
5758 malware_name = NULL;
5760 callout_address = NULL;
5761 sending_ip_address = NULL;
5763 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5765 store_reset(reset_point);
5768 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5769 return 0; /* To stop compiler warning */