1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
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 extern void init_lookup_list(void);
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Enums for cmdline interface *
57 *************************************************/
59 enum commandline_info { CMDINFO_NONE=0,
60 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
65 /*************************************************
66 * Compile regular expression and panic on fail *
67 *************************************************/
69 /* This function is called when failure to compile a regular expression leads
70 to a panic exit. In other cases, pcre_compile() is called directly. In many
71 cases where this function is used, the results of the compilation are to be
72 placed in long-lived store, so we temporarily reset the store management
73 functions that PCRE uses if the use_malloc flag is set.
76 pattern the pattern to compile
77 caseless TRUE if caseless matching is required
78 use_malloc TRUE if compile into malloc store
80 Returns: pointer to the compiled pattern
84 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
87 int options = PCRE_COPT;
92 pcre_malloc = function_store_malloc;
93 pcre_free = function_store_free;
95 if (caseless) options |= PCRE_CASELESS;
96 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
97 pcre_malloc = function_store_get;
98 pcre_free = function_dummy_free;
100 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
101 "%s at offset %d while compiling %s", error, offset, pattern);
108 /*************************************************
109 * Execute regular expression and set strings *
110 *************************************************/
112 /* This function runs a regular expression match, and sets up the pointers to
113 the matched substrings.
116 re the compiled expression
117 subject the subject string
118 options additional PCRE options
119 setup if < 0 do full setup
120 if >= 0 setup from setup+1 onwards,
121 excluding the full matched string
123 Returns: TRUE or FALSE
127 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
129 int ovector[3*(EXPAND_MAXN+1)];
130 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
131 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
133 if (n == 0) n = EXPAND_MAXN + 1;
137 expand_nmax = (setup < 0)? 0 : setup + 1;
138 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
140 expand_nstring[expand_nmax] = subject + ovector[nn];
141 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
151 /*************************************************
152 * Set up processing details *
153 *************************************************/
155 /* Save a text string for dumping when SIGUSR1 is received.
156 Do checks for overruns.
158 Arguments: format and arguments, as for printf()
163 set_process_info(const char *format, ...)
167 sprintf(CS process_info, "%5d ", (int)getpid());
168 len = Ustrlen(process_info);
169 va_start(ap, format);
170 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
171 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
172 len = Ustrlen(process_info);
173 process_info[len+0] = '\n';
174 process_info[len+1] = '\0';
175 process_info_len = len + 1;
176 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
183 /*************************************************
184 * Handler for SIGUSR1 *
185 *************************************************/
187 /* SIGUSR1 causes any exim process to write to the process log details of
188 what it is currently doing. It will only be used if the OS is capable of
189 setting up a handler that causes automatic restarting of any system call
190 that is in progress at the time.
192 This function takes care to be signal-safe.
194 Argument: the signal number (SIGUSR1)
199 usr1_handler(int sig)
203 os_restarting_signal(sig, usr1_handler);
205 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
208 /* If we are already running as the Exim user, try to create it in the
209 current process (assuming spool_directory exists). Otherwise, if we are
210 root, do the creation in an exim:exim subprocess. */
212 int euid = geteuid();
213 if (euid == exim_uid)
214 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
215 else if (euid == root_uid)
216 fd = log_create_as_exim(process_log_path);
219 /* If we are neither exim nor root, or if we failed to create the log file,
220 give up. There is not much useful we can do with errors, since we don't want
221 to disrupt whatever is going on outside the signal handler. */
225 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
231 /*************************************************
233 *************************************************/
235 /* This handler is enabled most of the time that Exim is running. The handler
236 doesn't actually get used unless alarm() has been called to set a timer, to
237 place a time limit on a system call of some kind. When the handler is run, it
240 There are some other SIGALRM handlers that are used in special cases when more
241 than just a flag setting is required; for example, when reading a message's
242 input. These are normally set up in the code module that uses them, and the
243 SIGALRM handler is reset to this one afterwards.
245 Argument: the signal value (SIGALRM)
250 sigalrm_handler(int sig)
252 sig = sig; /* Keep picky compilers happy */
254 os_non_restarting_signal(SIGALRM, sigalrm_handler);
259 /*************************************************
260 * Sleep for a fractional time interval *
261 *************************************************/
263 /* This function is called by millisleep() and exim_wait_tick() to wait for a
264 period of time that may include a fraction of a second. The coding is somewhat
265 tedious. We do not expect setitimer() ever to fail, but if it does, the process
266 will wait for ever, so we panic in this instance. (There was a case of this
267 when a bug in a function that calls milliwait() caused it to pass invalid data.
268 That's when I added the check. :-)
270 Argument: an itimerval structure containing the interval
275 milliwait(struct itimerval *itval)
278 sigset_t old_sigmask;
279 (void)sigemptyset(&sigmask); /* Empty mask */
280 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
281 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
282 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
283 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
284 "setitimer() failed: %s", strerror(errno));
285 (void)sigfillset(&sigmask); /* All signals */
286 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
287 (void)sigsuspend(&sigmask); /* Until SIGALRM */
288 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
294 /*************************************************
295 * Millisecond sleep function *
296 *************************************************/
298 /* The basic sleep() function has a granularity of 1 second, which is too rough
299 in some cases - for example, when using an increasing delay to slow down
302 Argument: number of millseconds
309 struct itimerval itval;
310 itval.it_interval.tv_sec = 0;
311 itval.it_interval.tv_usec = 0;
312 itval.it_value.tv_sec = msec/1000;
313 if ((itval.it_value.tv_usec = (msec % 1000) * 1000) == 0)
314 itval.it_value.tv_usec = 1;
320 /*************************************************
321 * Compare microsecond times *
322 *************************************************/
329 Returns: -1, 0, or +1
333 exim_tvcmp(struct timeval *t1, struct timeval *t2)
335 if (t1->tv_sec > t2->tv_sec) return +1;
336 if (t1->tv_sec < t2->tv_sec) return -1;
337 if (t1->tv_usec > t2->tv_usec) return +1;
338 if (t1->tv_usec < t2->tv_usec) return -1;
345 /*************************************************
346 * Clock tick wait function *
347 *************************************************/
349 /* Exim uses a time + a pid to generate a unique identifier in two places: its
350 message IDs, and in file names for maildir deliveries. Because some OS now
351 re-use pids within the same second, sub-second times are now being used.
352 However, for absolute certaintly, we must ensure the clock has ticked before
353 allowing the relevant process to complete. At the time of implementation of
354 this code (February 2003), the speed of processors is such that the clock will
355 invariably have ticked already by the time a process has done its job. This
356 function prepares for the time when things are faster - and it also copes with
357 clocks that go backwards.
360 then_tv A timeval which was used to create uniqueness; its usec field
361 has been rounded down to the value of the resolution.
362 We want to be sure the current time is greater than this.
363 resolution The resolution that was used to divide the microseconds
364 (1 for maildir, larger for message ids)
370 exim_wait_tick(struct timeval *then_tv, int resolution)
372 struct timeval now_tv;
373 long int now_true_usec;
375 (void)gettimeofday(&now_tv, NULL);
376 now_true_usec = now_tv.tv_usec;
377 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
379 if (exim_tvcmp(&now_tv, then_tv) <= 0)
381 struct itimerval itval;
382 itval.it_interval.tv_sec = 0;
383 itval.it_interval.tv_usec = 0;
384 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
385 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
387 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
388 negative value for the microseconds is possible only in the case when "now"
389 is more than a second less than "then". That means that itval.it_value.tv_sec
390 is greater than zero. The following correction is therefore safe. */
392 if (itval.it_value.tv_usec < 0)
394 itval.it_value.tv_usec += 1000000;
395 itval.it_value.tv_sec -= 1;
398 DEBUG(D_transport|D_receive)
400 if (!running_in_test_harness)
402 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
403 then_tv->tv_sec, (long) then_tv->tv_usec,
404 now_tv.tv_sec, (long) now_tv.tv_usec);
405 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
406 (long) itval.it_value.tv_usec);
417 /*************************************************
418 * Call fopen() with umask 777 and adjust mode *
419 *************************************************/
421 /* Exim runs with umask(0) so that files created with open() have the mode that
422 is specified in the open() call. However, there are some files, typically in
423 the spool directory, that are created with fopen(). They end up world-writeable
424 if no precautions are taken. Although the spool directory is not accessible to
425 the world, this is an untidiness. So this is a wrapper function for fopen()
426 that sorts out the mode of the created file.
429 filename the file name
430 options the fopen() options
431 mode the required mode
433 Returns: the fopened FILE or NULL
437 modefopen(const uschar *filename, const char *options, mode_t mode)
439 mode_t saved_umask = umask(0777);
440 FILE *f = Ufopen(filename, options);
441 (void)umask(saved_umask);
442 if (f != NULL) (void)fchmod(fileno(f), mode);
449 /*************************************************
450 * Ensure stdin, stdout, and stderr exist *
451 *************************************************/
453 /* Some operating systems grumble if an exec() happens without a standard
454 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
455 file will be opened and will use these fd values, and then some other bit of
456 code will assume, for example, that it can write error messages to stderr.
457 This function ensures that fds 0, 1, and 2 are open if they do not already
458 exist, by connecting them to /dev/null.
460 This function is also used to ensure that std{in,out,err} exist at all times,
461 so that if any library that Exim calls tries to use them, it doesn't crash.
473 for (i = 0; i <= 2; i++)
475 if (fstat(i, &statbuf) < 0 && errno == EBADF)
477 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
478 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
479 string_open_failed(errno, "/dev/null"));
480 if (devnull != i) (void)dup2(devnull, i);
483 if (devnull > 2) (void)close(devnull);
489 /*************************************************
490 * Close unwanted file descriptors for delivery *
491 *************************************************/
493 /* This function is called from a new process that has been forked to deliver
494 an incoming message, either directly, or using exec.
496 We want any smtp input streams to be closed in this new process. However, it
497 has been observed that using fclose() here causes trouble. When reading in -bS
498 input, duplicate copies of messages have been seen. The files will be sharing a
499 file pointer with the parent process, and it seems that fclose() (at least on
500 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
501 least sometimes. Hence we go for closing the underlying file descriptors.
503 If TLS is active, we want to shut down the TLS library, but without molesting
504 the parent's SSL connection.
506 For delivery of a non-SMTP message, we want to close stdin and stdout (and
507 stderr unless debugging) because the calling process might have set them up as
508 pipes and be waiting for them to close before it waits for the submission
509 process to terminate. If they aren't closed, they hold up the calling process
510 until the initial delivery process finishes, which is not what we want.
512 Exception: We do want it for synchronous delivery!
514 And notwithstanding all the above, if D_resolver is set, implying resolver
515 debugging, leave stdout open, because that's where the resolver writes its
518 When we close stderr (which implies we've also closed stdout), we also get rid
519 of any controlling terminal.
531 tls_close(TRUE, FALSE); /* Shut down the TLS library */
533 (void)close(fileno(smtp_in));
534 (void)close(fileno(smtp_out));
539 (void)close(0); /* stdin */
540 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
541 if (debug_selector == 0) /* stderr */
543 if (!synchronous_delivery)
556 /*************************************************
558 *************************************************/
560 /* This function sets a new uid and gid permanently, optionally calling
561 initgroups() to set auxiliary groups. There are some special cases when running
562 Exim in unprivileged modes. In these situations the effective uid will not be
563 root; if we already have the right effective uid/gid, and don't need to
564 initialize any groups, leave things as they are.
569 igflag TRUE if initgroups() wanted
570 msg text to use in debugging output and failure log
572 Returns: nothing; bombs out on failure
576 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
578 uid_t euid = geteuid();
579 gid_t egid = getegid();
581 if (euid == root_uid || euid != uid || egid != gid || igflag)
583 /* At least one OS returns +1 for initgroups failure, so just check for
588 struct passwd *pw = getpwuid(uid);
591 if (initgroups(pw->pw_name, gid) != 0)
592 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
593 (long int)uid, strerror(errno));
595 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
596 "no passwd entry for uid=%ld", (long int)uid);
599 if (setgid(gid) < 0 || setuid(uid) < 0)
601 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
602 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
606 /* Debugging output included uid/gid and all groups */
610 int group_count, save_errno;
611 gid_t group_list[NGROUPS_MAX];
612 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
613 (long int)geteuid(), (long int)getegid(), (long int)getpid());
614 group_count = getgroups(NGROUPS_MAX, group_list);
616 debug_printf(" auxiliary group list:");
620 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
622 else if (group_count < 0)
623 debug_printf(" <error: %s>", strerror(save_errno));
624 else debug_printf(" <none>");
632 /*************************************************
634 *************************************************/
636 /* Exim exits via this function so that it always clears up any open
642 Returns: does not return
650 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
651 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
658 /*************************************************
659 * Extract port from host address *
660 *************************************************/
662 /* Called to extract the port from the values given to -oMa and -oMi.
663 It also checks the syntax of the address, and terminates it before the
664 port data when a port is extracted.
667 address the address, with possible port on the end
669 Returns: the port, or zero if there isn't one
670 bombs out on a syntax error
674 check_port(uschar *address)
676 int port = host_address_extract_port(address);
677 if (string_is_ip_address(address, NULL) == 0)
679 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
687 /*************************************************
688 * Test/verify an address *
689 *************************************************/
691 /* This function is called by the -bv and -bt code. It extracts a working
692 address from a full RFC 822 address. This isn't really necessary per se, but it
693 has the effect of collapsing source routes.
697 flags flag bits for verify_address()
698 exit_value to be set for failures
704 test_address(uschar *s, int flags, int *exit_value)
706 int start, end, domain;
707 uschar *parse_error = NULL;
708 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
712 fprintf(stdout, "syntax error: %s\n", parse_error);
717 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
718 -1, -1, NULL, NULL, NULL);
719 if (rc == FAIL) *exit_value = 2;
720 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
726 /*************************************************
727 * Show supported features *
728 *************************************************/
730 /* This function is called for -bV/--version and for -d to output the optional
731 features of the current Exim binary.
733 Arguments: a FILE for printing
738 show_whats_supported(FILE *f)
742 #ifdef DB_VERSION_STRING
743 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
744 #elif defined(BTREEVERSION) && defined(HASHVERSION)
746 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
748 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
750 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
751 fprintf(f, "Probably ndbm\n");
752 #elif defined(USE_TDB)
753 fprintf(f, "Using tdb\n");
756 fprintf(f, "Probably GDBM (native mode)\n");
758 fprintf(f, "Probably GDBM (compatibility mode)\n");
762 fprintf(f, "Support for:");
763 #ifdef SUPPORT_CRYPTEQ
764 fprintf(f, " crypteq");
767 fprintf(f, " iconv()");
772 #ifdef HAVE_SETCLASSRESOURCES
773 fprintf(f, " use_setclassresources");
782 fprintf(f, " Expand_dlfunc");
784 #ifdef USE_TCP_WRAPPERS
785 fprintf(f, " TCPwrappers");
789 fprintf(f, " GnuTLS");
791 fprintf(f, " OpenSSL");
794 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
795 fprintf(f, " translate_ip_address");
797 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
798 fprintf(f, " move_frozen_messages");
800 #ifdef WITH_CONTENT_SCAN
801 fprintf(f, " Content_Scanning");
806 #ifdef WITH_OLD_DEMIME
807 fprintf(f, " Old_Demime");
815 #ifdef EXPERIMENTAL_SPF
816 fprintf(f, " Experimental_SPF");
818 #ifdef EXPERIMENTAL_SRS
819 fprintf(f, " Experimental_SRS");
821 #ifdef EXPERIMENTAL_BRIGHTMAIL
822 fprintf(f, " Experimental_Brightmail");
824 #ifdef EXPERIMENTAL_DCC
825 fprintf(f, " Experimental_DCC");
827 #ifdef EXPERIMENTAL_DMARC
828 fprintf(f, " Experimental_DMARC");
830 #ifdef EXPERIMENTAL_PROXY
831 fprintf(f, " Experimental_Proxy");
833 #ifdef EXPERIMENTAL_TPDA
834 fprintf(f, " Experimental_TPDA");
836 #ifdef EXPERIMENTAL_REDIS
837 fprintf(f, " Experimental_Redis");
839 #ifdef EXPERIMENTAL_CERTNAMES
840 fprintf(f, " Experimental_Certnames");
842 #ifdef EXPERIMENTAL_DSN
843 fprintf(f, " Experimental_DSN");
847 fprintf(f, "Lookups (built-in):");
848 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
849 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
851 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
854 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
855 fprintf(f, " dbm dbmjz dbmnz");
857 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
858 fprintf(f, " dnsdb");
860 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
861 fprintf(f, " dsearch");
863 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
864 fprintf(f, " ibase");
866 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
867 fprintf(f, " ldap ldapdn ldapm");
869 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
870 fprintf(f, " mysql");
872 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
873 fprintf(f, " nis nis0");
875 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
876 fprintf(f, " nisplus");
878 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
879 fprintf(f, " oracle");
881 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
882 fprintf(f, " passwd");
884 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
885 fprintf(f, " pgsql");
887 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
888 fprintf(f, " sqlite");
890 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
891 fprintf(f, " testdb");
893 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
894 fprintf(f, " whoson");
898 fprintf(f, "Authenticators:");
900 fprintf(f, " cram_md5");
902 #ifdef AUTH_CYRUS_SASL
903 fprintf(f, " cyrus_sasl");
906 fprintf(f, " dovecot");
909 fprintf(f, " gsasl");
911 #ifdef AUTH_HEIMDAL_GSSAPI
912 fprintf(f, " heimdal_gssapi");
914 #ifdef AUTH_PLAINTEXT
915 fprintf(f, " plaintext");
922 fprintf(f, "Routers:");
924 fprintf(f, " accept");
926 #ifdef ROUTER_DNSLOOKUP
927 fprintf(f, " dnslookup");
929 #ifdef ROUTER_IPLITERAL
930 fprintf(f, " ipliteral");
932 #ifdef ROUTER_IPLOOKUP
933 fprintf(f, " iplookup");
935 #ifdef ROUTER_MANUALROUTE
936 fprintf(f, " manualroute");
938 #ifdef ROUTER_QUERYPROGRAM
939 fprintf(f, " queryprogram");
941 #ifdef ROUTER_REDIRECT
942 fprintf(f, " redirect");
946 fprintf(f, "Transports:");
947 #ifdef TRANSPORT_APPENDFILE
948 fprintf(f, " appendfile");
949 #ifdef SUPPORT_MAILDIR
950 fprintf(f, "/maildir");
952 #ifdef SUPPORT_MAILSTORE
953 fprintf(f, "/mailstore");
959 #ifdef TRANSPORT_AUTOREPLY
960 fprintf(f, " autoreply");
962 #ifdef TRANSPORT_LMTP
965 #ifdef TRANSPORT_PIPE
968 #ifdef TRANSPORT_SMTP
973 if (fixed_never_users[0] > 0)
976 fprintf(f, "Fixed never_users: ");
977 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
978 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
979 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
982 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
984 /* Everything else is details which are only worth reporting when debugging.
985 Perhaps the tls_version_report should move into this too. */
990 /* clang defines __GNUC__ (at least, for me) so test for it first */
991 #if defined(__clang__)
992 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
993 #elif defined(__GNUC__)
994 fprintf(f, "Compiler: GCC [%s]\n",
998 "? unknown version ?"
1002 fprintf(f, "Compiler: <unknown>\n");
1006 tls_version_report(f);
1009 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1010 if (authi->version_report) {
1011 (*authi->version_report)(f);
1015 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1016 characters; unless it's an ancient version of PCRE in which case it
1018 #ifndef PCRE_PRERELEASE
1019 #define PCRE_PRERELEASE
1022 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1023 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1025 PCRE_MAJOR, PCRE_MINOR,
1026 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1029 #undef EXPAND_AND_QUOTE
1032 for (i = 0; i < lookup_list_count; i++)
1034 if (lookup_list[i]->version_report)
1035 lookup_list[i]->version_report(f);
1038 #ifdef WHITELIST_D_MACROS
1039 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1041 fprintf(f, "WHITELIST_D_MACROS unset\n");
1043 #ifdef TRUSTED_CONFIG_LIST
1044 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1046 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1053 /*************************************************
1054 * Show auxiliary information about Exim *
1055 *************************************************/
1058 show_exim_information(enum commandline_info request, FILE *stream)
1065 fprintf(stream, "Oops, something went wrong.\n");
1069 "The -bI: flag takes a string indicating which information to provide.\n"
1070 "If the string is not recognised, you'll get this help (on stderr).\n"
1072 " exim -bI:help this information\n"
1073 " exim -bI:dscp dscp value keywords known\n"
1074 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1078 for (pp = exim_sieve_extension_list; *pp; ++pp)
1079 fprintf(stream, "%s\n", *pp);
1082 dscp_list_to_stream(stream);
1088 /*************************************************
1089 * Quote a local part *
1090 *************************************************/
1092 /* This function is used when a sender address or a From: or Sender: header
1093 line is being created from the caller's login, or from an authenticated_id. It
1094 applies appropriate quoting rules for a local part.
1096 Argument: the local part
1097 Returns: the local part, quoted if necessary
1101 local_part_quote(uschar *lpart)
1103 BOOL needs_quote = FALSE;
1108 for (t = lpart; !needs_quote && *t != 0; t++)
1110 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1111 (*t != '.' || t == lpart || t[1] == 0);
1114 if (!needs_quote) return lpart;
1117 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1121 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1124 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1127 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1128 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1129 yield = string_cat(yield, &size, &ptr, nq, 1);
1133 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1141 /*************************************************
1142 * Load readline() functions *
1143 *************************************************/
1145 /* This function is called from testing executions that read data from stdin,
1146 but only when running as the calling user. Currently, only -be does this. The
1147 function loads the readline() function library and passes back the functions.
1148 On some systems, it needs the curses library, so load that too, but try without
1149 it if loading fails. All this functionality has to be requested at build time.
1152 fn_readline_ptr pointer to where to put the readline pointer
1153 fn_addhist_ptr pointer to where to put the addhistory function
1155 Returns: the dlopen handle or NULL on failure
1159 set_readline(char * (**fn_readline_ptr)(const char *),
1160 void (**fn_addhist_ptr)(const char *))
1163 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1165 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1166 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1168 if (dlhandle != NULL)
1170 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1171 * char * readline (const char *prompt);
1172 * void add_history (const char *string);
1174 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1175 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1179 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1188 /*************************************************
1189 * Get a line from stdin for testing things *
1190 *************************************************/
1192 /* This function is called when running tests that can take a number of lines
1193 of input (for example, -be and -bt). It handles continuations and trailing
1194 spaces. And prompting and a blank line output on eof. If readline() is in use,
1195 the arguments are non-NULL and provide the relevant functions.
1198 fn_readline readline function or NULL
1199 fn_addhist addhist function or NULL
1201 Returns: pointer to dynamic memory, or NULL at end of file
1205 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1210 uschar *yield = NULL;
1212 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1216 uschar buffer[1024];
1220 char *readline_line = NULL;
1221 if (fn_readline != NULL)
1223 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1224 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1225 p = US readline_line;
1230 /* readline() not in use */
1233 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1237 /* Handle the line */
1239 ss = p + (int)Ustrlen(p);
1240 while (ss > p && isspace(ss[-1])) ss--;
1244 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1247 yield = string_cat(yield, &size, &ptr, p, ss - p);
1250 if (fn_readline != NULL) free(readline_line);
1253 if (ss == p || yield[ptr-1] != '\\')
1261 if (yield == NULL) printf("\n");
1267 /*************************************************
1268 * Output usage information for the program *
1269 *************************************************/
1271 /* This function is called when there are no recipients
1272 or a specific --help argument was added.
1275 progname information on what name we were called by
1277 Returns: DOES NOT RETURN
1281 exim_usage(uschar *progname)
1284 /* Handle specific program invocation varients */
1285 if (Ustrcmp(progname, US"-mailq") == 0)
1288 "mailq - list the contents of the mail queue\n\n"
1289 "For a list of options, see the Exim documentation.\n");
1293 /* Generic usage - we output this whatever happens */
1295 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1296 "not directly from a shell command line. Options and/or arguments control\n"
1297 "what it does when called. For a list of options, see the Exim documentation.\n");
1304 /*************************************************
1305 * Validate that the macros given are okay *
1306 *************************************************/
1308 /* Typically, Exim will drop privileges if macros are supplied. In some
1309 cases, we want to not do so.
1311 Arguments: none (macros is a global)
1312 Returns: true if trusted, false otherwise
1316 macros_trusted(void)
1318 #ifdef WHITELIST_D_MACROS
1320 uschar *whitelisted, *end, *p, **whites, **w;
1321 int white_count, i, n;
1323 BOOL prev_char_item, found;
1328 #ifndef WHITELIST_D_MACROS
1332 /* We only trust -D overrides for some invoking users:
1333 root, the exim run-time user, the optional config owner user.
1334 I don't know why config-owner would be needed, but since they can own the
1335 config files anyway, there's no security risk to letting them override -D. */
1336 if ( ! ((real_uid == root_uid)
1337 || (real_uid == exim_uid)
1338 #ifdef CONFIGURE_OWNER
1339 || (real_uid == config_uid)
1343 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1347 /* Get a list of macros which are whitelisted */
1348 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1349 prev_char_item = FALSE;
1351 for (p = whitelisted; *p != '\0'; ++p)
1353 if (*p == ':' || isspace(*p))
1358 prev_char_item = FALSE;
1361 if (!prev_char_item)
1362 prev_char_item = TRUE;
1369 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1370 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1375 if (i == white_count)
1377 while (*p != '\0' && p < end)
1383 /* The list of macros should be very short. Accept the N*M complexity. */
1384 for (m = macros; m != NULL; m = m->next)
1387 for (w = whites; *w; ++w)
1388 if (Ustrcmp(*w, m->name) == 0)
1395 if (m->replacement == NULL)
1397 len = Ustrlen(m->replacement);
1400 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1401 0, PCRE_EOPT, NULL, 0);
1404 if (n != PCRE_ERROR_NOMATCH)
1405 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1409 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1415 /*************************************************
1416 * Entry point and high-level code *
1417 *************************************************/
1419 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1420 the appropriate action. All the necessary functions are present in the one
1421 binary. I originally thought one should split it up, but it turns out that so
1422 much of the apparatus is needed in each chunk that one might as well just have
1423 it all available all the time, which then makes the coding easier as well.
1426 argc count of entries in argv
1427 argv argument strings, with argv[0] being the program name
1429 Returns: EXIT_SUCCESS if terminated successfully
1430 EXIT_FAILURE otherwise, except when a message has been sent
1431 to the sender, and -oee was given
1435 main(int argc, char **cargv)
1437 uschar **argv = USS cargv;
1438 int arg_receive_timeout = -1;
1439 int arg_smtp_receive_timeout = -1;
1440 int arg_error_handling = error_handling;
1441 int filter_sfd = -1;
1442 int filter_ufd = -1;
1445 int list_queue_option = 0;
1447 int msg_action_arg = -1;
1448 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1449 int queue_only_reason = 0;
1451 int perl_start_option = 0;
1453 int recipients_arg = argc;
1454 int sender_address_domain = 0;
1455 int test_retry_arg = -1;
1456 int test_rewrite_arg = -1;
1457 BOOL arg_queue_only = FALSE;
1458 BOOL bi_option = FALSE;
1459 BOOL checking = FALSE;
1460 BOOL count_queue = FALSE;
1461 BOOL expansion_test = FALSE;
1462 BOOL extract_recipients = FALSE;
1463 BOOL flag_G = FALSE;
1464 BOOL flag_n = FALSE;
1465 BOOL forced_delivery = FALSE;
1466 BOOL f_end_dot = FALSE;
1467 BOOL deliver_give_up = FALSE;
1468 BOOL list_queue = FALSE;
1469 BOOL list_options = FALSE;
1470 BOOL local_queue_only;
1472 BOOL one_msg_action = FALSE;
1473 BOOL queue_only_set = FALSE;
1474 BOOL receiving_message = TRUE;
1475 BOOL sender_ident_set = FALSE;
1476 BOOL session_local_queue_only;
1478 BOOL removed_privilege = FALSE;
1479 BOOL usage_wanted = FALSE;
1480 BOOL verify_address_mode = FALSE;
1481 BOOL verify_as_sender = FALSE;
1482 BOOL version_printed = FALSE;
1483 uschar *alias_arg = NULL;
1484 uschar *called_as = US"";
1485 uschar *cmdline_syslog_name = NULL;
1486 uschar *start_queue_run_id = NULL;
1487 uschar *stop_queue_run_id = NULL;
1488 uschar *expansion_test_message = NULL;
1489 uschar *ftest_domain = NULL;
1490 uschar *ftest_localpart = NULL;
1491 uschar *ftest_prefix = NULL;
1492 uschar *ftest_suffix = NULL;
1493 uschar *malware_test_file = NULL;
1494 uschar *real_sender_address;
1495 uschar *originator_home = US"/";
1500 struct stat statbuf;
1501 pid_t passed_qr_pid = (pid_t)0;
1502 int passed_qr_pipe = -1;
1503 gid_t group_list[NGROUPS_MAX];
1505 /* For the -bI: flag */
1506 enum commandline_info info_flag = CMDINFO_NONE;
1507 BOOL info_stdout = FALSE;
1509 /* Possible options for -R and -S */
1511 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1513 /* Need to define this in case we need to change the environment in order
1514 to get rid of a bogus time zone. We have to make it char rather than uschar
1515 because some OS define it in /usr/include/unistd.h. */
1517 extern char **environ;
1519 /* If the Exim user and/or group and/or the configuration file owner/group were
1520 defined by ref:name at build time, we must now find the actual uid/gid values.
1521 This is a feature to make the lives of binary distributors easier. */
1523 #ifdef EXIM_USERNAME
1524 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1528 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1532 /* If ref:name uses a number as the name, route_finduser() returns
1533 TRUE with exim_uid set and pw coerced to NULL. */
1535 exim_gid = pw->pw_gid;
1536 #ifndef EXIM_GROUPNAME
1540 "exim: ref:name should specify a usercode, not a group.\n"
1541 "exim: can't let you get away with it unless you also specify a group.\n");
1548 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1554 #ifdef EXIM_GROUPNAME
1555 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1557 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1563 #ifdef CONFIGURE_OWNERNAME
1564 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1566 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1567 CONFIGURE_OWNERNAME);
1572 /* We default the system_filter_user to be the Exim run-time user, as a
1573 sane non-root value. */
1574 system_filter_uid = exim_uid;
1576 #ifdef CONFIGURE_GROUPNAME
1577 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1579 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1580 CONFIGURE_GROUPNAME);
1585 /* In the Cygwin environment, some initialization needs doing. It is fudged
1586 in by means of this macro. */
1592 /* Check a field which is patched when we are running Exim within its
1593 testing harness; do a fast initial check, and then the whole thing. */
1595 running_in_test_harness =
1596 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1598 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1599 at the start of a program; however, it seems that some environments do not
1600 follow this. A "strange" locale can affect the formatting of timestamps, so we
1603 setlocale(LC_ALL, "C");
1605 /* Set up the default handler for timing using alarm(). */
1607 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1609 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1610 because store_malloc writes a log entry on failure. */
1612 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1613 if (log_buffer == NULL)
1615 fprintf(stderr, "exim: failed to get store for log buffer\n");
1619 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1620 NULL when the daemon is run and the file is closed. We have to use this
1621 indirection, because some systems don't allow writing to the variable "stderr".
1624 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1626 /* Arrange for the PCRE regex library to use our store functions. Note that
1627 the normal calls are actually macros that add additional arguments for
1628 debugging purposes so we have to assign specially constructed functions here.
1629 The default is to use store in the stacking pool, but this is overridden in the
1630 regex_must_compile() function. */
1632 pcre_malloc = function_store_get;
1633 pcre_free = function_dummy_free;
1635 /* Ensure there is a big buffer for temporary use in several places. It is put
1636 in malloc store so that it can be freed for enlargement if necessary. */
1638 big_buffer = store_malloc(big_buffer_size);
1640 /* Set up the handler for the data request signal, and set the initial
1641 descriptive text. */
1643 set_process_info("initializing");
1644 os_restarting_signal(SIGUSR1, usr1_handler);
1646 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1647 in the daemon code. For the rest of Exim's uses, we ignore it. */
1649 signal(SIGHUP, SIG_IGN);
1651 /* We don't want to die on pipe errors as the code is written to handle
1652 the write error instead. */
1654 signal(SIGPIPE, SIG_IGN);
1656 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1657 set to SIG_IGN. This causes subprocesses that complete before the parent
1658 process waits for them not to hang around, so when Exim calls wait(), nothing
1659 is there. The wait() code has been made robust against this, but let's ensure
1660 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1661 ending status. We use sigaction rather than plain signal() on those OS where
1662 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1663 problem on AIX with this.) */
1667 struct sigaction act;
1668 act.sa_handler = SIG_DFL;
1669 sigemptyset(&(act.sa_mask));
1671 sigaction(SIGCHLD, &act, NULL);
1674 signal(SIGCHLD, SIG_DFL);
1677 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1682 /* Set up the version number. Set up the leading 'E' for the external form of
1683 message ids, set the pointer to the internal form, and initialize it to
1684 indicate no message being processed. */
1687 message_id_option[0] = '-';
1688 message_id_external = message_id_option + 1;
1689 message_id_external[0] = 'E';
1690 message_id = message_id_external + 1;
1693 /* Set the umask to zero so that any files Exim creates using open() are
1694 created with the modes that it specifies. NOTE: Files created with fopen() have
1695 a problem, which was not recognized till rather late (February 2006). With this
1696 umask, such files will be world writeable. (They are all content scanning files
1697 in the spool directory, which isn't world-accessible, so this is not a
1698 disaster, but it's untidy.) I don't want to change this overall setting,
1699 however, because it will interact badly with the open() calls. Instead, there's
1700 now a function called modefopen() that fiddles with the umask while calling
1705 /* Precompile the regular expression for matching a message id. Keep this in
1706 step with the code that generates ids in the accept.c module. We need to do
1707 this here, because the -M options check their arguments for syntactic validity
1708 using mac_ismsgid, which uses this. */
1711 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1713 /* Precompile the regular expression that is used for matching an SMTP error
1714 code, possibly extended, at the start of an error message. Note that the
1715 terminating whitespace character is included. */
1718 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1721 #ifdef WHITELIST_D_MACROS
1722 /* Precompile the regular expression used to filter the content of macros
1723 given to -D for permissibility. */
1725 regex_whitelisted_macro =
1726 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1730 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1731 this seems to be a generally accepted convention, since one finds symbolic
1732 links called "mailq" in standard OS configurations. */
1734 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1735 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1738 receiving_message = FALSE;
1739 called_as = US"-mailq";
1742 /* If the program is called as "rmail" treat it as equivalent to
1743 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1744 i.e. preventing a single dot on a line from terminating the message, and
1745 returning with zero return code, even in cases of error (provided an error
1746 message has been sent). */
1748 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1749 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1752 called_as = US"-rmail";
1753 errors_sender_rc = EXIT_SUCCESS;
1756 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1757 this is a smail convention. */
1759 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1760 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1762 smtp_input = smtp_batched_input = TRUE;
1763 called_as = US"-rsmtp";
1766 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1767 this is a smail convention. */
1769 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1770 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1773 receiving_message = FALSE;
1774 called_as = US"-runq";
1777 /* If the program is called as "newaliases" treat it as equivalent to
1778 "exim -bi"; this is a sendmail convention. */
1780 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1781 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1784 receiving_message = FALSE;
1785 called_as = US"-newaliases";
1788 /* Save the original effective uid for a couple of uses later. It should
1789 normally be root, but in some esoteric environments it may not be. */
1791 original_euid = geteuid();
1793 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1794 to be the same as the real ones. This makes a difference only if Exim is setuid
1795 (or setgid) to something other than root, which could be the case in some
1796 special configurations. */
1798 real_uid = getuid();
1799 real_gid = getgid();
1801 if (real_uid == root_uid)
1803 rv = setgid(real_gid);
1806 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1807 (long int)real_gid, strerror(errno));
1810 rv = setuid(real_uid);
1813 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1814 (long int)real_uid, strerror(errno));
1819 /* If neither the original real uid nor the original euid was root, Exim is
1820 running in an unprivileged state. */
1822 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1824 /* Scan the program's arguments. Some can be dealt with right away; others are
1825 simply recorded for checking and handling afterwards. Do a high-level switch
1826 on the second character (the one after '-'), to save some effort. */
1828 for (i = 1; i < argc; i++)
1830 BOOL badarg = FALSE;
1831 uschar *arg = argv[i];
1835 /* An argument not starting with '-' is the start of a recipients list;
1836 break out of the options-scanning loop. */
1844 /* An option consistion of -- terminates the options */
1846 if (Ustrcmp(arg, "--") == 0)
1848 recipients_arg = i + 1;
1852 /* Handle flagged options */
1854 switchchar = arg[1];
1857 /* Make all -ex options synonymous with -oex arguments, since that
1858 is assumed by various callers. Also make -qR options synonymous with -R
1859 options, as that seems to be required as well. Allow for -qqR too, and
1860 the same for -S options. */
1862 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1863 Ustrncmp(arg+1, "qR", 2) == 0 ||
1864 Ustrncmp(arg+1, "qS", 2) == 0)
1866 switchchar = arg[2];
1869 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1871 switchchar = arg[3];
1873 queue_2stage = TRUE;
1876 /* Make -r synonymous with -f, since it is a documented alias */
1878 else if (arg[1] == 'r') switchchar = 'f';
1880 /* Make -ov synonymous with -v */
1882 else if (Ustrcmp(arg, "-ov") == 0)
1888 /* deal with --option_aliases */
1889 else if (switchchar == '-')
1891 if (Ustrcmp(argrest, "help") == 0)
1893 usage_wanted = TRUE;
1896 else if (Ustrcmp(argrest, "version") == 0)
1903 /* High-level switch on active initial letter */
1908 /* sendmail uses -Ac and -Am to control which .cf file is used;
1911 if (*argrest == '\0') { badarg = TRUE; break; }
1914 BOOL ignore = FALSE;
1919 if (*(argrest + 1) == '\0')
1923 if (!ignore) { badarg = TRUE; break; }
1927 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1928 so has no need of it. */
1931 if (*argrest == 0) i++; /* Skip over the type */
1936 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1938 /* -bd: Run in daemon mode, awaiting SMTP connections.
1939 -bdf: Ditto, but in the foreground.
1942 if (*argrest == 'd')
1944 daemon_listen = TRUE;
1945 if (*(++argrest) == 'f') background_daemon = FALSE;
1946 else if (*argrest != 0) { badarg = TRUE; break; }
1949 /* -be: Run in expansion test mode
1950 -bem: Ditto, but read a message from a file first
1953 else if (*argrest == 'e')
1955 expansion_test = checking = TRUE;
1956 if (argrest[1] == 'm')
1958 if (++i >= argc) { badarg = TRUE; break; }
1959 expansion_test_message = argv[i];
1962 if (argrest[1] != 0) { badarg = TRUE; break; }
1965 /* -bF: Run system filter test */
1967 else if (*argrest == 'F')
1969 filter_test |= FTEST_SYSTEM;
1970 if (*(++argrest) != 0) { badarg = TRUE; break; }
1971 if (++i < argc) filter_test_sfile = argv[i]; else
1973 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1978 /* -bf: Run user filter test
1979 -bfd: Set domain for filter testing
1980 -bfl: Set local part for filter testing
1981 -bfp: Set prefix for filter testing
1982 -bfs: Set suffix for filter testing
1985 else if (*argrest == 'f')
1987 if (*(++argrest) == 0)
1989 filter_test |= FTEST_USER;
1990 if (++i < argc) filter_test_ufile = argv[i]; else
1992 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
2000 fprintf(stderr, "exim: string expected after %s\n", arg);
2003 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2004 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2005 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2006 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2007 else { badarg = TRUE; break; }
2011 /* -bh: Host checking - an IP address must follow. */
2013 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2015 if (++i >= argc) { badarg = TRUE; break; }
2016 sender_host_address = argv[i];
2017 host_checking = checking = log_testing_mode = TRUE;
2018 host_checking_callout = argrest[1] == 'c';
2021 /* -bi: This option is used by sendmail to initialize *the* alias file,
2022 though it has the -oA option to specify a different file. Exim has no
2023 concept of *the* alias file, but since Sun's YP make script calls
2024 sendmail this way, some support must be provided. */
2026 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2028 /* -bI: provide information, of the type to follow after a colon.
2029 This is an Exim flag. */
2031 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2033 uschar *p = &argrest[2];
2034 info_flag = CMDINFO_HELP;
2037 if (strcmpic(p, CUS"sieve") == 0)
2039 info_flag = CMDINFO_SIEVE;
2042 else if (strcmpic(p, CUS"dscp") == 0)
2044 info_flag = CMDINFO_DSCP;
2047 else if (strcmpic(p, CUS"help") == 0)
2054 /* -bm: Accept and deliver message - the default option. Reinstate
2055 receiving_message, which got turned off for all -b options. */
2057 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2059 /* -bmalware: test the filename given for malware */
2061 else if (Ustrcmp(argrest, "malware") == 0)
2063 if (++i >= argc) { badarg = TRUE; break; }
2064 malware_test_file = argv[i];
2067 /* -bnq: For locally originating messages, do not qualify unqualified
2068 addresses. In the envelope, this causes errors; in header lines they
2071 else if (Ustrcmp(argrest, "nq") == 0)
2073 allow_unqualified_sender = FALSE;
2074 allow_unqualified_recipient = FALSE;
2077 /* -bpxx: List the contents of the mail queue, in various forms. If
2078 the option is -bpc, just a queue count is needed. Otherwise, if the
2079 first letter after p is r, then order is random. */
2081 else if (*argrest == 'p')
2083 if (*(++argrest) == 'c')
2086 if (*(++argrest) != 0) badarg = TRUE;
2090 if (*argrest == 'r')
2092 list_queue_option = 8;
2095 else list_queue_option = 0;
2099 /* -bp: List the contents of the mail queue, top-level only */
2101 if (*argrest == 0) {}
2103 /* -bpu: List the contents of the mail queue, top-level undelivered */
2105 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2107 /* -bpa: List the contents of the mail queue, including all delivered */
2109 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2111 /* Unknown after -bp[r] */
2121 /* -bP: List the configuration variables given as the address list.
2122 Force -v, so configuration errors get displayed. */
2124 else if (Ustrcmp(argrest, "P") == 0)
2126 list_options = TRUE;
2127 debug_selector |= D_v;
2128 debug_file = stderr;
2131 /* -brt: Test retry configuration lookup */
2133 else if (Ustrcmp(argrest, "rt") == 0)
2135 test_retry_arg = i + 1;
2139 /* -brw: Test rewrite configuration */
2141 else if (Ustrcmp(argrest, "rw") == 0)
2143 test_rewrite_arg = i + 1;
2147 /* -bS: Read SMTP commands on standard input, but produce no replies -
2148 all errors are reported by sending messages. */
2150 else if (Ustrcmp(argrest, "S") == 0)
2151 smtp_input = smtp_batched_input = receiving_message = TRUE;
2153 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2154 on standard output. */
2156 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2158 /* -bt: address testing mode */
2160 else if (Ustrcmp(argrest, "t") == 0)
2161 address_test_mode = checking = log_testing_mode = TRUE;
2163 /* -bv: verify addresses */
2165 else if (Ustrcmp(argrest, "v") == 0)
2166 verify_address_mode = checking = log_testing_mode = TRUE;
2168 /* -bvs: verify sender addresses */
2170 else if (Ustrcmp(argrest, "vs") == 0)
2172 verify_address_mode = checking = log_testing_mode = TRUE;
2173 verify_as_sender = TRUE;
2176 /* -bV: Print version string and support details */
2178 else if (Ustrcmp(argrest, "V") == 0)
2180 printf("Exim version %s #%s built %s\n", version_string,
2181 version_cnumber, version_date);
2182 printf("%s\n", CS version_copyright);
2183 version_printed = TRUE;
2184 show_whats_supported(stdout);
2187 /* -bw: inetd wait mode, accept a listening socket as stdin */
2189 else if (*argrest == 'w')
2191 inetd_wait_mode = TRUE;
2192 background_daemon = FALSE;
2193 daemon_listen = TRUE;
2194 if (*(++argrest) != '\0')
2196 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2197 if (inetd_wait_timeout <= 0)
2199 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2209 /* -C: change configuration file list; ignore if it isn't really
2210 a change! Enforce a prefix check if required. */
2215 if(++i < argc) argrest = argv[i]; else
2216 { badarg = TRUE; break; }
2218 if (Ustrcmp(config_main_filelist, argrest) != 0)
2220 #ifdef ALT_CONFIG_PREFIX
2222 int len = Ustrlen(ALT_CONFIG_PREFIX);
2223 uschar *list = argrest;
2225 while((filename = string_nextinlist(&list, &sep, big_buffer,
2226 big_buffer_size)) != NULL)
2228 if ((Ustrlen(filename) < len ||
2229 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2230 Ustrstr(filename, "/../") != NULL) &&
2231 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2233 fprintf(stderr, "-C Permission denied\n");
2238 if (real_uid != root_uid)
2240 #ifdef TRUSTED_CONFIG_LIST
2242 if (real_uid != exim_uid
2243 #ifdef CONFIGURE_OWNER
2244 && real_uid != config_uid
2247 trusted_config = FALSE;
2250 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2253 struct stat statbuf;
2255 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2256 (statbuf.st_uid != root_uid /* owner not root */
2257 #ifdef CONFIGURE_OWNER
2258 && statbuf.st_uid != config_uid /* owner not the special one */
2261 (statbuf.st_gid != root_gid /* group not root */
2262 #ifdef CONFIGURE_GROUP
2263 && statbuf.st_gid != config_gid /* group not the special one */
2265 && (statbuf.st_mode & 020) != 0 /* group writeable */
2267 (statbuf.st_mode & 2) != 0) /* world writeable */
2269 trusted_config = FALSE;
2274 /* Well, the trust list at least is up to scratch... */
2275 void *reset_point = store_get(0);
2276 uschar *trusted_configs[32];
2280 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2282 uschar *start = big_buffer, *nl;
2283 while (*start && isspace(*start))
2287 nl = Ustrchr(start, '\n');
2290 trusted_configs[nr_configs++] = string_copy(start);
2291 if (nr_configs == 32)
2299 uschar *list = argrest;
2301 while (trusted_config && (filename = string_nextinlist(&list,
2302 &sep, big_buffer, big_buffer_size)) != NULL)
2304 for (i=0; i < nr_configs; i++)
2306 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2309 if (i == nr_configs)
2311 trusted_config = FALSE;
2315 store_reset(reset_point);
2319 /* No valid prefixes found in trust_list file. */
2320 trusted_config = FALSE;
2326 /* Could not open trust_list file. */
2327 trusted_config = FALSE;
2331 /* Not root; don't trust config */
2332 trusted_config = FALSE;
2336 config_main_filelist = argrest;
2337 config_changed = TRUE;
2342 /* -D: set up a macro definition */
2345 #ifdef DISABLE_D_OPTION
2346 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2351 macro_item *mlast = NULL;
2354 uschar *s = argrest;
2356 while (isspace(*s)) s++;
2358 if (*s < 'A' || *s > 'Z')
2360 fprintf(stderr, "exim: macro name set by -D must start with "
2361 "an upper case letter\n");
2365 while (isalnum(*s) || *s == '_')
2367 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2371 if (ptr == 0) { badarg = TRUE; break; }
2372 while (isspace(*s)) s++;
2375 if (*s++ != '=') { badarg = TRUE; break; }
2376 while (isspace(*s)) s++;
2379 for (m = macros; m != NULL; m = m->next)
2381 if (Ustrcmp(m->name, name) == 0)
2383 fprintf(stderr, "exim: duplicated -D in command line\n");
2389 m = store_get(sizeof(macro_item) + Ustrlen(name));
2391 m->command_line = TRUE;
2392 if (mlast == NULL) macros = m; else mlast->next = m;
2393 Ustrcpy(m->name, name);
2394 m->replacement = string_copy(s);
2396 if (clmacro_count >= MAX_CLMACROS)
2398 fprintf(stderr, "exim: too many -D options on command line\n");
2401 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2407 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2408 The latter is now a no-op, retained for compatibility only. If -dd is used,
2409 debugging subprocesses of the daemon is disabled. */
2412 if (Ustrcmp(argrest, "ropcr") == 0)
2414 /* drop_cr = TRUE; */
2417 /* Use an intermediate variable so that we don't set debugging while
2418 decoding the debugging bits. */
2422 unsigned int selector = D_default;
2425 if (*argrest == 'd')
2427 debug_daemon = TRUE;
2431 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2432 debug_options_count, US"debug", 0);
2433 debug_selector = selector;
2438 /* -E: This is a local error message. This option is not intended for
2439 external use at all, but is not restricted to trusted callers because it
2440 does no harm (just suppresses certain error messages) and if Exim is run
2441 not setuid root it won't always be trusted when it generates error
2442 messages using this option. If there is a message id following -E, point
2443 message_reference at it, for logging. */
2446 local_error_message = TRUE;
2447 if (mac_ismsgid(argrest)) message_reference = argrest;
2451 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2452 option, so it looks as if historically the -oex options are also callable
2453 without the leading -o. So we have to accept them. Before the switch,
2454 anything starting -oe has been converted to -e. Exim does not support all
2455 of the sendmail error options. */
2458 if (Ustrcmp(argrest, "e") == 0)
2460 arg_error_handling = ERRORS_SENDER;
2461 errors_sender_rc = EXIT_SUCCESS;
2463 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2464 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2465 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2466 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2471 /* -F: Set sender's full name, used instead of the gecos entry from
2472 the password file. Since users can usually alter their gecos entries,
2473 there's no security involved in using this instead. The data can follow
2474 the -F or be in the next argument. */
2479 if(++i < argc) argrest = argv[i]; else
2480 { badarg = TRUE; break; }
2482 originator_name = argrest;
2483 sender_name_forced = TRUE;
2487 /* -f: Set sender's address - this value is only actually used if Exim is
2488 run by a trusted user, or if untrusted_set_sender is set and matches the
2489 address, except that the null address can always be set by any user. The
2490 test for this happens later, when the value given here is ignored when not
2491 permitted. For an untrusted user, the actual sender is still put in Sender:
2492 if it doesn't match the From: header (unless no_local_from_check is set).
2493 The data can follow the -f or be in the next argument. The -r switch is an
2494 obsolete form of -f but since there appear to be programs out there that
2495 use anything that sendmail has ever supported, better accept it - the
2496 synonymizing is done before the switch above.
2498 At this stage, we must allow domain literal addresses, because we don't
2499 know what the setting of allow_domain_literals is yet. Ditto for trailing
2500 dots and strip_trailing_dot. */
2508 if (i+1 < argc) argrest = argv[++i]; else
2509 { badarg = TRUE; break; }
2513 sender_address = string_sprintf(""); /* Ensure writeable memory */
2517 uschar *temp = argrest + Ustrlen(argrest) - 1;
2518 while (temp >= argrest && isspace(*temp)) temp--;
2519 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2520 allow_domain_literals = TRUE;
2521 strip_trailing_dot = TRUE;
2522 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2523 &sender_address_domain, TRUE);
2524 allow_domain_literals = FALSE;
2525 strip_trailing_dot = FALSE;
2526 if (sender_address == NULL)
2528 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2529 return EXIT_FAILURE;
2532 sender_address_forced = TRUE;
2536 /* -G: sendmail invocation to specify that it's a gateway submission and
2537 sendmail may complain about problems instead of fixing them.
2538 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2539 not at this time complain about problems. */
2545 /* -h: Set the hop count for an incoming message. Exim does not currently
2546 support this; it always computes it by counting the Received: headers.
2547 To put it in will require a change to the spool header file format. */
2552 if(++i < argc) argrest = argv[i]; else
2553 { badarg = TRUE; break; }
2555 if (!isdigit(*argrest)) badarg = TRUE;
2559 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2560 not to be documented for sendmail but mailx (at least) uses it) */
2563 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2567 /* -L: set the identifier used for syslog; equivalent to setting
2568 syslog_processname in the config file, but needs to be an admin option. */
2571 if (*argrest == '\0')
2573 if(++i < argc) argrest = argv[i]; else
2574 { badarg = TRUE; break; }
2576 sz = Ustrlen(argrest);
2579 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2580 return EXIT_FAILURE;
2584 fprintf(stderr, "exim: the -L syslog name is too short\n");
2585 return EXIT_FAILURE;
2587 cmdline_syslog_name = argrest;
2591 receiving_message = FALSE;
2593 /* -MC: continue delivery of another message via an existing open
2594 file descriptor. This option is used for an internal call by the
2595 smtp transport when there is a pending message waiting to go to an
2596 address to which it has got a connection. Five subsequent arguments are
2597 required: transport name, host name, IP address, sequence number, and
2598 message_id. Transports may decline to create new processes if the sequence
2599 number gets too big. The channel is stdin. This (-MC) must be the last
2600 argument. There's a subsequent check that the real-uid is privileged.
2602 If we are running in the test harness. delay for a bit, to let the process
2603 that set this one up complete. This makes for repeatability of the logging,
2606 if (Ustrcmp(argrest, "C") == 0)
2608 union sockaddr_46 interface_sock;
2609 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2613 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2614 return EXIT_FAILURE;
2617 if (msg_action_arg >= 0)
2619 fprintf(stderr, "exim: incompatible arguments\n");
2620 return EXIT_FAILURE;
2623 continue_transport = argv[++i];
2624 continue_hostname = argv[++i];
2625 continue_host_address = argv[++i];
2626 continue_sequence = Uatoi(argv[++i]);
2627 msg_action = MSG_DELIVER;
2628 msg_action_arg = ++i;
2629 forced_delivery = TRUE;
2630 queue_run_pid = passed_qr_pid;
2631 queue_run_pipe = passed_qr_pipe;
2633 if (!mac_ismsgid(argv[i]))
2635 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2637 return EXIT_FAILURE;
2640 /* Set up $sending_ip_address and $sending_port */
2642 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2644 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2648 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2650 return EXIT_FAILURE;
2653 if (running_in_test_harness) millisleep(500);
2657 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2658 precedes -MC (see above). The flag indicates that the host to which
2659 Exim is connected has accepted an AUTH sequence. */
2661 else if (Ustrcmp(argrest, "CA") == 0)
2663 smtp_authenticated = TRUE;
2667 #ifdef EXPERIMENTAL_DSN
2668 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2669 that exim is connected to supports the esmtp extension DSN */
2670 else if (strcmp(argrest, "CD") == 0)
2672 smtp_use_dsn = TRUE;
2677 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2678 it preceded -MC (see above) */
2680 else if (Ustrcmp(argrest, "CP") == 0)
2682 smtp_use_pipelining = TRUE;
2686 /* -MCQ: pass on the pid of the queue-running process that started
2687 this chain of deliveries and the fd of its synchronizing pipe; this
2688 is useful only when it precedes -MC (see above) */
2690 else if (Ustrcmp(argrest, "CQ") == 0)
2692 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2694 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2699 /* -MCS: set the smtp_use_size flag; this is useful only when it
2700 precedes -MC (see above) */
2702 else if (Ustrcmp(argrest, "CS") == 0)
2704 smtp_use_size = TRUE;
2708 /* -MCT: set the tls_offered flag; this is useful only when it
2709 precedes -MC (see above). The flag indicates that the host to which
2710 Exim is connected has offered TLS support. */
2713 else if (Ustrcmp(argrest, "CT") == 0)
2720 /* -M[x]: various operations on the following list of message ids:
2721 -M deliver the messages, ignoring next retry times and thawing
2722 -Mc deliver the messages, checking next retry times, no thawing
2723 -Mf freeze the messages
2724 -Mg give up on the messages
2725 -Mt thaw the messages
2726 -Mrm remove the messages
2727 In the above cases, this must be the last option. There are also the
2728 following options which are followed by a single message id, and which
2729 act on that message. Some of them use the "recipient" addresses as well.
2730 -Mar add recipient(s)
2731 -Mmad mark all recipients delivered
2732 -Mmd mark recipients(s) delivered
2734 -Mset load a message for use with -be
2736 -Mvc show copy (of whole message, in RFC 2822 format)
2741 else if (*argrest == 0)
2743 msg_action = MSG_DELIVER;
2744 forced_delivery = deliver_force_thaw = TRUE;
2746 else if (Ustrcmp(argrest, "ar") == 0)
2748 msg_action = MSG_ADD_RECIPIENT;
2749 one_msg_action = TRUE;
2751 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2752 else if (Ustrcmp(argrest, "es") == 0)
2754 msg_action = MSG_EDIT_SENDER;
2755 one_msg_action = TRUE;
2757 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2758 else if (Ustrcmp(argrest, "g") == 0)
2760 msg_action = MSG_DELIVER;
2761 deliver_give_up = TRUE;
2763 else if (Ustrcmp(argrest, "mad") == 0)
2765 msg_action = MSG_MARK_ALL_DELIVERED;
2767 else if (Ustrcmp(argrest, "md") == 0)
2769 msg_action = MSG_MARK_DELIVERED;
2770 one_msg_action = TRUE;
2772 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2773 else if (Ustrcmp(argrest, "set") == 0)
2775 msg_action = MSG_LOAD;
2776 one_msg_action = TRUE;
2778 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2779 else if (Ustrcmp(argrest, "vb") == 0)
2781 msg_action = MSG_SHOW_BODY;
2782 one_msg_action = TRUE;
2784 else if (Ustrcmp(argrest, "vc") == 0)
2786 msg_action = MSG_SHOW_COPY;
2787 one_msg_action = TRUE;
2789 else if (Ustrcmp(argrest, "vh") == 0)
2791 msg_action = MSG_SHOW_HEADER;
2792 one_msg_action = TRUE;
2794 else if (Ustrcmp(argrest, "vl") == 0)
2796 msg_action = MSG_SHOW_LOG;
2797 one_msg_action = TRUE;
2799 else { badarg = TRUE; break; }
2801 /* All the -Mxx options require at least one message id. */
2803 msg_action_arg = i + 1;
2804 if (msg_action_arg >= argc)
2806 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2807 return EXIT_FAILURE;
2810 /* Some require only message ids to follow */
2812 if (!one_msg_action)
2815 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2817 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2819 return EXIT_FAILURE;
2821 goto END_ARG; /* Remaining args are ids */
2824 /* Others require only one message id, possibly followed by addresses,
2825 which will be handled as normal arguments. */
2829 if (!mac_ismsgid(argv[msg_action_arg]))
2831 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2832 argv[msg_action_arg], arg);
2833 return EXIT_FAILURE;
2840 /* Some programs seem to call the -om option without the leading o;
2841 for sendmail it askes for "me too". Exim always does this. */
2844 if (*argrest != 0) badarg = TRUE;
2848 /* -N: don't do delivery - a debugging option that stops transports doing
2849 their thing. It implies debugging at the D_v level. */
2854 dont_deliver = TRUE;
2855 debug_selector |= D_v;
2856 debug_file = stderr;
2862 /* -n: This means "don't alias" in sendmail, apparently.
2863 For normal invocations, it has no effect.
2864 It may affect some other options. */
2870 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2871 option to the specified value. This form uses long names. We need to handle
2872 -O option=value and -Ooption=value. */
2879 fprintf(stderr, "exim: string expected after -O\n");
2887 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2890 if (*argrest == 'A')
2892 alias_arg = argrest + 1;
2893 if (alias_arg[0] == 0)
2895 if (i+1 < argc) alias_arg = argv[++i]; else
2897 fprintf(stderr, "exim: string expected after -oA\n");
2903 /* -oB: Set a connection message max value for remote deliveries */
2905 else if (*argrest == 'B')
2907 uschar *p = argrest + 1;
2910 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2912 connection_max_messages = 1;
2921 fprintf(stderr, "exim: number expected after -oB\n");
2924 connection_max_messages = Uatoi(p);
2928 /* -odb: background delivery */
2930 else if (Ustrcmp(argrest, "db") == 0)
2932 synchronous_delivery = FALSE;
2933 arg_queue_only = FALSE;
2934 queue_only_set = TRUE;
2937 /* -odf: foreground delivery (smail-compatible option); same effect as
2938 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2941 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2943 synchronous_delivery = TRUE;
2944 arg_queue_only = FALSE;
2945 queue_only_set = TRUE;
2948 /* -odq: queue only */
2950 else if (Ustrcmp(argrest, "dq") == 0)
2952 synchronous_delivery = FALSE;
2953 arg_queue_only = TRUE;
2954 queue_only_set = TRUE;
2957 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2958 but no remote delivery */
2960 else if (Ustrcmp(argrest, "dqs") == 0)
2963 arg_queue_only = FALSE;
2964 queue_only_set = TRUE;
2967 /* -oex: Sendmail error flags. As these are also accepted without the
2968 leading -o prefix, for compatibility with vacation and other callers,
2969 they are handled with -e above. */
2971 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2972 -oitrue: Another sendmail syntax for the same */
2974 else if (Ustrcmp(argrest, "i") == 0 ||
2975 Ustrcmp(argrest, "itrue") == 0)
2978 /* -oM*: Set various characteristics for an incoming message; actually
2979 acted on for trusted callers only. */
2981 else if (*argrest == 'M')
2985 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2989 /* -oMa: Set sender host address */
2991 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2993 /* -oMaa: Set authenticator name */
2995 else if (Ustrcmp(argrest, "Maa") == 0)
2996 sender_host_authenticated = argv[++i];
2998 /* -oMas: setting authenticated sender */
3000 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3002 /* -oMai: setting authenticated id */
3004 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3006 /* -oMi: Set incoming interface address */
3008 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3010 /* -oMm: Message reference */
3012 else if (Ustrcmp(argrest, "Mm") == 0)
3014 if (!mac_ismsgid(argv[i+1]))
3016 fprintf(stderr,"-oMm must be a valid message ID\n");
3019 if (!trusted_config)
3021 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3024 message_reference = argv[++i];
3027 /* -oMr: Received protocol */
3029 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3031 /* -oMs: Set sender host name */
3033 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3035 /* -oMt: Set sender ident */
3037 else if (Ustrcmp(argrest, "Mt") == 0)
3039 sender_ident_set = TRUE;
3040 sender_ident = argv[++i];
3043 /* Else a bad argument */
3052 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3053 seem to call this as -m (undocumented), so that is also accepted (see
3056 else if (Ustrcmp(argrest, "m") == 0) {}
3058 /* -oo: An ancient flag for old-style addresses which still seems to
3059 crop up in some calls (see in SCO). */
3061 else if (Ustrcmp(argrest, "o") == 0) {}
3063 /* -oP <name>: set pid file path for daemon */
3065 else if (Ustrcmp(argrest, "P") == 0)
3066 override_pid_file_path = argv[++i];
3068 /* -or <n>: set timeout for non-SMTP acceptance
3069 -os <n>: set timeout for SMTP acceptance */
3071 else if (*argrest == 'r' || *argrest == 's')
3073 int *tp = (*argrest == 'r')?
3074 &arg_receive_timeout : &arg_smtp_receive_timeout;
3075 if (argrest[1] == 0)
3077 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3079 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3082 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3087 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3089 else if (Ustrcmp(argrest, "X") == 0)
3090 override_local_interfaces = argv[++i];
3092 /* Unknown -o argument */
3098 /* -ps: force Perl startup; -pd force delayed Perl startup */
3102 if (*argrest == 's' && argrest[1] == 0)
3104 perl_start_option = 1;
3107 if (*argrest == 'd' && argrest[1] == 0)
3109 perl_start_option = -1;
3114 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3115 which sets the host protocol and host name */
3119 if (i+1 < argc) argrest = argv[++i]; else
3120 { badarg = TRUE; break; }
3125 uschar *hn = Ustrchr(argrest, ':');
3128 received_protocol = argrest;
3132 received_protocol = string_copyn(argrest, hn - argrest);
3133 sender_host_name = hn + 1;
3140 receiving_message = FALSE;
3141 if (queue_interval >= 0)
3143 fprintf(stderr, "exim: -q specified more than once\n");
3147 /* -qq...: Do queue runs in a 2-stage manner */
3149 if (*argrest == 'q')
3151 queue_2stage = TRUE;
3155 /* -qi...: Do only first (initial) deliveries */
3157 if (*argrest == 'i')
3159 queue_run_first_delivery = TRUE;
3163 /* -qf...: Run the queue, forcing deliveries
3164 -qff..: Ditto, forcing thawing as well */
3166 if (*argrest == 'f')
3168 queue_run_force = TRUE;
3169 if (*(++argrest) == 'f')
3171 deliver_force_thaw = TRUE;
3176 /* -q[f][f]l...: Run the queue only on local deliveries */
3178 if (*argrest == 'l')
3180 queue_run_local = TRUE;
3184 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3185 optionally starting from a given message id. */
3187 if (*argrest == 0 &&
3188 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3191 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3192 start_queue_run_id = argv[++i];
3193 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3194 stop_queue_run_id = argv[++i];
3197 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3198 optionally local only. */
3203 queue_interval = readconf_readtime(argrest, 0, FALSE);
3205 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3206 if (queue_interval <= 0)
3208 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3215 case 'R': /* Synonymous with -qR... */
3216 receiving_message = FALSE;
3218 /* -Rf: As -R (below) but force all deliveries,
3219 -Rff: Ditto, but also thaw all frozen messages,
3220 -Rr: String is regex
3221 -Rrf: Regex and force
3222 -Rrff: Regex and force and thaw
3224 in all cases provided there are no further characters in this
3230 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3232 if (Ustrcmp(argrest, rsopts[i]) == 0)
3234 if (i != 2) queue_run_force = TRUE;
3235 if (i >= 2) deliver_selectstring_regex = TRUE;
3236 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3237 argrest += Ustrlen(rsopts[i]);
3242 /* -R: Set string to match in addresses for forced queue run to
3243 pick out particular messages. */
3247 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3249 fprintf(stderr, "exim: string expected after -R\n");
3253 else deliver_selectstring = argrest;
3257 /* -r: an obsolete synonym for -f (see above) */
3260 /* -S: Like -R but works on sender. */
3262 case 'S': /* Synonymous with -qS... */
3263 receiving_message = FALSE;
3265 /* -Sf: As -S (below) but force all deliveries,
3266 -Sff: Ditto, but also thaw all frozen messages,
3267 -Sr: String is regex
3268 -Srf: Regex and force
3269 -Srff: Regex and force and thaw
3271 in all cases provided there are no further characters in this
3277 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3279 if (Ustrcmp(argrest, rsopts[i]) == 0)
3281 if (i != 2) queue_run_force = TRUE;
3282 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3283 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3284 argrest += Ustrlen(rsopts[i]);
3289 /* -S: Set string to match in addresses for forced queue run to
3290 pick out particular messages. */
3294 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3296 fprintf(stderr, "exim: string expected after -S\n");
3300 else deliver_selectstring_sender = argrest;
3303 /* -Tqt is an option that is exclusively for use by the testing suite.
3304 It is not recognized in other circumstances. It allows for the setting up
3305 of explicit "queue times" so that various warning/retry things can be
3306 tested. Otherwise variability of clock ticks etc. cause problems. */
3309 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3310 fudged_queue_times = argv[++i];
3315 /* -t: Set flag to extract recipients from body of message. */
3318 if (*argrest == 0) extract_recipients = TRUE;
3320 /* -ti: Set flag to extract recipients from body of message, and also
3321 specify that dot does not end the message. */
3323 else if (Ustrcmp(argrest, "i") == 0)
3325 extract_recipients = TRUE;
3329 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3332 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3339 /* -U: This means "initial user submission" in sendmail, apparently. The
3340 doc claims that in future sendmail may refuse syntactically invalid
3341 messages instead of fixing them. For the moment, we just ignore it. */
3347 /* -v: verify things - this is a very low-level debugging */
3352 debug_selector |= D_v;
3353 debug_file = stderr;
3359 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3361 The -x flag tells the sendmail command that mail from a local
3362 mail program has National Language Support (NLS) extended characters
3363 in the body of the mail item. The sendmail command can send mail with
3364 extended NLS characters across networks that normally corrupts these
3367 As Exim is 8-bit clean, it just ignores this flag. */
3370 if (*argrest != 0) badarg = TRUE;
3373 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3374 logs to that file. We swallow the parameter and otherwise ignore it. */
3377 if (*argrest == '\0')
3381 fprintf(stderr, "exim: string expected after -X\n");
3387 /* All other initial characters are errors */
3392 } /* End of high-level switch statement */
3394 /* Failed to recognize the option, or syntax error */
3398 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3399 "option %s\n", arg);
3405 /* If -R or -S have been specified without -q, assume a single queue run. */
3407 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3408 queue_interval < 0) queue_interval = 0;
3412 /* If usage_wanted is set we call the usage function - which never returns */
3413 if (usage_wanted) exim_usage(called_as);
3415 /* Arguments have been processed. Check for incompatibilities. */
3417 (smtp_input || extract_recipients || recipients_arg < argc) &&
3418 (daemon_listen || queue_interval >= 0 || bi_option ||
3419 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3420 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3423 msg_action_arg > 0 &&
3424 (daemon_listen || queue_interval >= 0 || list_options ||
3425 (checking && msg_action != MSG_LOAD) ||
3426 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3429 (daemon_listen || queue_interval >= 0) &&
3430 (sender_address != NULL || list_options || list_queue || checking ||
3434 daemon_listen && queue_interval == 0
3437 inetd_wait_mode && queue_interval >= 0
3441 (checking || smtp_input || extract_recipients ||
3442 filter_test != FTEST_NONE || bi_option)
3445 verify_address_mode &&
3446 (address_test_mode || smtp_input || extract_recipients ||
3447 filter_test != FTEST_NONE || bi_option)
3450 address_test_mode && (smtp_input || extract_recipients ||
3451 filter_test != FTEST_NONE || bi_option)
3454 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3458 deliver_selectstring != NULL && queue_interval < 0
3461 msg_action == MSG_LOAD &&
3462 (!expansion_test || expansion_test_message != NULL)
3466 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3470 /* If debugging is set up, set the file and the file descriptor to pass on to
3471 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3472 to run in the foreground. */
3474 if (debug_selector != 0)
3476 debug_file = stderr;
3477 debug_fd = fileno(debug_file);
3478 background_daemon = FALSE;
3479 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3480 if (debug_selector != D_v) /* -v only doesn't show this */
3482 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3483 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3485 if (!version_printed)
3486 show_whats_supported(stderr);
3490 /* When started with root privilege, ensure that the limits on the number of
3491 open files and the number of processes (where that is accessible) are
3492 sufficiently large, or are unset, in case Exim has been called from an
3493 environment where the limits are screwed down. Not all OS have the ability to
3494 change some of these limits. */
3498 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3504 #ifdef RLIMIT_NOFILE
3505 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3507 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3509 rlp.rlim_cur = rlp.rlim_max = 0;
3512 /* I originally chose 1000 as a nice big number that was unlikely to
3513 be exceeded. It turns out that some older OS have a fixed upper limit of
3516 if (rlp.rlim_cur < 1000)
3518 rlp.rlim_cur = rlp.rlim_max = 1000;
3519 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3521 rlp.rlim_cur = rlp.rlim_max = 256;
3522 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3523 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3530 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3532 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3534 rlp.rlim_cur = rlp.rlim_max = 0;
3537 #ifdef RLIM_INFINITY
3538 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3540 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3542 if (rlp.rlim_cur < 1000)
3544 rlp.rlim_cur = rlp.rlim_max = 1000;
3546 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3547 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3553 /* Exim is normally entered as root (but some special configurations are
3554 possible that don't do this). However, it always spins off sub-processes that
3555 set their uid and gid as required for local delivery. We don't want to pass on
3556 any extra groups that root may belong to, so we want to get rid of them all at
3559 We need to obey setgroups() at this stage, before possibly giving up root
3560 privilege for a changed configuration file, but later on we might need to
3561 check on the additional groups for the admin user privilege - can't do that
3562 till after reading the config, which might specify the exim gid. Therefore,
3563 save the group list here first. */
3565 group_count = getgroups(NGROUPS_MAX, group_list);
3566 if (group_count < 0)
3568 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3572 /* There is a fundamental difference in some BSD systems in the matter of
3573 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3574 known not to be different. On the "different" systems there is a single group
3575 list, and the first entry in it is the current group. On all other versions of
3576 Unix there is a supplementary group list, which is in *addition* to the current
3577 group. Consequently, to get rid of all extraneous groups on a "standard" system
3578 you pass over 0 groups to setgroups(), while on a "different" system you pass
3579 over a single group - the current group, which is always the first group in the
3580 list. Calling setgroups() with zero groups on a "different" system results in
3581 an error return. The following code should cope with both types of system.
3583 However, if this process isn't running as root, setgroups() can't be used
3584 since you have to be root to run it, even if throwing away groups. Not being
3585 root here happens only in some unusual configurations. We just ignore the
3588 if (setgroups(0, NULL) != 0)
3590 if (setgroups(1, group_list) != 0 && !unprivileged)
3592 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3597 /* If the configuration file name has been altered by an argument on the
3598 command line (either a new file name or a macro definition) and the caller is
3599 not root, or if this is a filter testing run, remove any setuid privilege the
3600 program has and run as the underlying user.
3602 The exim user is locked out of this, which severely restricts the use of -C
3605 Otherwise, set the real ids to the effective values (should be root unless run
3606 from inetd, which it can either be root or the exim uid, if one is configured).
3608 There is a private mechanism for bypassing some of this, in order to make it
3609 possible to test lots of configurations automatically, without having either to
3610 recompile each time, or to patch in an actual configuration file name and other
3611 values (such as the path name). If running in the test harness, pretend that
3612 configuration file changes and macro definitions haven't happened. */
3615 (!trusted_config || /* Config changed, or */
3616 !macros_trusted()) && /* impermissible macros and */
3617 real_uid != root_uid && /* Not root, and */
3618 !running_in_test_harness /* Not fudged */
3620 expansion_test /* expansion testing */
3622 filter_test != FTEST_NONE) /* Filter testing */
3624 setgroups(group_count, group_list);
3625 exim_setugid(real_uid, real_gid, FALSE,
3626 US"-C, -D, -be or -bf forces real uid");
3627 removed_privilege = TRUE;
3629 /* In the normal case when Exim is called like this, stderr is available
3630 and should be used for any logging information because attempts to write
3631 to the log will usually fail. To arrange this, we unset really_exim. However,
3632 if no stderr is available there is no point - we might as well have a go
3633 at the log (if it fails, syslog will be written).
3635 Note that if the invoker is Exim, the logs remain available. Messing with
3636 this causes unlogged successful deliveries. */
3638 if ((log_stderr != NULL) && (real_uid != exim_uid))
3639 really_exim = FALSE;
3642 /* Privilege is to be retained for the moment. It may be dropped later,
3643 depending on the job that this Exim process has been asked to do. For now, set
3644 the real uid to the effective so that subsequent re-execs of Exim are done by a
3647 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3649 /* If testing a filter, open the file(s) now, before wasting time doing other
3650 setups and reading the message. */
3652 if ((filter_test & FTEST_SYSTEM) != 0)
3654 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3657 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3659 return EXIT_FAILURE;
3663 if ((filter_test & FTEST_USER) != 0)
3665 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3668 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3670 return EXIT_FAILURE;
3674 /* Initialise lookup_list
3675 If debugging, already called above via version reporting.
3676 In either case, we initialise the list of available lookups while running
3677 as root. All dynamically modules are loaded from a directory which is
3678 hard-coded into the binary and is code which, if not a module, would be
3679 part of Exim already. Ability to modify the content of the directory
3680 is equivalent to the ability to modify a setuid binary!
3682 This needs to happen before we read the main configuration. */
3685 /* Read the main runtime configuration data; this gives up if there
3686 is a failure. It leaves the configuration file open so that the subsequent
3687 configuration data for delivery can be read if needed. */
3691 /* If an action on specific messages is requested, or if a daemon or queue
3692 runner is being started, we need to know if Exim was called by an admin user.
3693 This is the case if the real user is root or exim, or if the real group is
3694 exim, or if one of the supplementary groups is exim or a group listed in
3695 admin_groups. We don't fail all message actions immediately if not admin_user,
3696 since some actions can be performed by non-admin users. Instead, set admin_user
3697 for later interrogation. */
3699 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3704 for (i = 0; i < group_count; i++)
3706 if (group_list[i] == exim_gid) admin_user = TRUE;
3707 else if (admin_groups != NULL)
3709 for (j = 1; j <= (int)(admin_groups[0]); j++)
3710 if (admin_groups[j] == group_list[i])
3711 { admin_user = TRUE; break; }
3713 if (admin_user) break;
3717 /* Another group of privileged users are the trusted users. These are root,
3718 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3719 are permitted to specify sender_addresses with -f on the command line, and
3720 other message parameters as well. */
3722 if (real_uid == root_uid || real_uid == exim_uid)
3723 trusted_caller = TRUE;
3728 if (trusted_users != NULL)
3730 for (i = 1; i <= (int)(trusted_users[0]); i++)
3731 if (trusted_users[i] == real_uid)
3732 { trusted_caller = TRUE; break; }
3735 if (!trusted_caller && trusted_groups != NULL)
3737 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3739 if (trusted_groups[i] == real_gid)
3740 trusted_caller = TRUE;
3741 else for (j = 0; j < group_count; j++)
3743 if (trusted_groups[i] == group_list[j])
3744 { trusted_caller = TRUE; break; }
3746 if (trusted_caller) break;
3751 /* Handle the decoding of logging options. */
3753 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3754 log_selector_string, log_options, log_options_count, US"log", 0);
3758 debug_printf("configuration file is %s\n", config_main_filename);
3759 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3760 log_extra_selector);
3763 /* If domain literals are not allowed, check the sender address that was
3764 supplied with -f. Ditto for a stripped trailing dot. */
3766 if (sender_address != NULL)
3768 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3770 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3771 "allowed\n", sender_address);
3772 return EXIT_FAILURE;
3774 if (f_end_dot && !strip_trailing_dot)
3776 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3777 "(trailing dot not allowed)\n", sender_address);
3778 return EXIT_FAILURE;
3782 /* See if an admin user overrode our logging. */
3784 if (cmdline_syslog_name != NULL)
3788 syslog_processname = cmdline_syslog_name;
3789 log_file_path = string_copy(CUS"syslog");
3793 /* not a panic, non-privileged users should not be able to spam paniclog */
3795 "exim: you lack sufficient privilege to specify syslog process name\n");
3796 return EXIT_FAILURE;
3800 /* Paranoia check of maximum lengths of certain strings. There is a check
3801 on the length of the log file path in log.c, which will come into effect
3802 if there are any calls to write the log earlier than this. However, if we
3803 get this far but the string is very long, it is better to stop now than to
3804 carry on and (e.g.) receive a message and then have to collapse. The call to
3805 log_write() from here will cause the ultimate panic collapse if the complete
3806 file name exceeds the buffer length. */
3808 if (Ustrlen(log_file_path) > 200)
3809 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3810 "log_file_path is longer than 200 chars: aborting");
3812 if (Ustrlen(pid_file_path) > 200)
3813 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3814 "pid_file_path is longer than 200 chars: aborting");
3816 if (Ustrlen(spool_directory) > 200)
3817 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3818 "spool_directory is longer than 200 chars: aborting");
3820 /* Length check on the process name given to syslog for its TAG field,
3821 which is only permitted to be 32 characters or less. See RFC 3164. */
3823 if (Ustrlen(syslog_processname) > 32)
3824 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3825 "syslog_processname is longer than 32 chars: aborting");
3827 /* In some operating systems, the environment variable TMPDIR controls where
3828 temporary files are created; Exim doesn't use these (apart from when delivering
3829 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3830 If TMPDIR is found in the environment, reset it to the value defined in the
3831 TMPDIR macro, if this macro is defined. */
3836 for (p = USS environ; *p != NULL; p++)
3838 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3839 Ustrcmp(*p+7, TMPDIR) != 0)
3841 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3842 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3844 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3850 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3851 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3852 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3853 called by a user who has set the TZ variable. This then affects the timestamps
3854 in log files and in Received: headers, and any created Date: header lines. The
3855 required timezone is settable in the configuration file, so nothing can be done
3856 about this earlier - but hopefully nothing will normally be logged earlier than
3857 this. We have to make a new environment if TZ is wrong, but don't bother if
3858 timestamps_utc is set, because then all times are in UTC anyway. */
3860 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3862 timestamps_utc = TRUE;
3866 uschar *envtz = US getenv("TZ");
3867 if ((envtz == NULL && timezone_string != NULL) ||
3869 (timezone_string == NULL ||
3870 Ustrcmp(timezone_string, envtz) != 0)))
3872 uschar **p = USS environ;
3876 while (*p++ != NULL) count++;
3877 if (envtz == NULL) count++;
3878 newp = new = malloc(sizeof(uschar *) * (count + 1));
3879 for (p = USS environ; *p != NULL; p++)
3881 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3884 if (timezone_string != NULL)
3886 *newp = malloc(Ustrlen(timezone_string) + 4);
3887 sprintf(CS *newp++, "TZ=%s", timezone_string);
3892 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3893 tod_stamp(tod_log));
3897 /* Handle the case when we have removed the setuid privilege because of -C or
3898 -D. This means that the caller of Exim was not root.
3900 There is a problem if we were running as the Exim user. The sysadmin may
3901 expect this case to retain privilege because "the binary was called by the
3902 Exim user", but it hasn't, because either the -D option set macros, or the
3903 -C option set a non-trusted configuration file. There are two possibilities:
3905 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3906 to do message deliveries. Thus, the fact that it is running as a
3907 non-privileged user is plausible, and might be wanted in some special
3908 configurations. However, really_exim will have been set false when
3909 privilege was dropped, to stop Exim trying to write to its normal log
3910 files. Therefore, re-enable normal log processing, assuming the sysadmin
3911 has set up the log directory correctly.
3913 (2) If deliver_drop_privilege is not set, the configuration won't work as
3914 apparently intended, and so we log a panic message. In order to retain
3915 root for -C or -D, the caller must either be root or be invoking a
3916 trusted configuration file (when deliver_drop_privilege is false). */
3918 if (removed_privilege && (!trusted_config || macros != NULL) &&
3919 real_uid == exim_uid)
3921 if (deliver_drop_privilege)
3922 really_exim = TRUE; /* let logging work normally */
3924 log_write(0, LOG_MAIN|LOG_PANIC,
3925 "exim user lost privilege for using %s option",
3926 trusted_config? "-D" : "-C");
3929 /* Start up Perl interpreter if Perl support is configured and there is a
3930 perl_startup option, and the configuration or the command line specifies
3931 initializing starting. Note that the global variables are actually called
3932 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3935 if (perl_start_option != 0)
3936 opt_perl_at_start = (perl_start_option > 0);
3937 if (opt_perl_at_start && opt_perl_startup != NULL)
3940 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3941 errstr = init_perl(opt_perl_startup);
3944 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3945 return EXIT_FAILURE;
3947 opt_perl_started = TRUE;
3949 #endif /* EXIM_PERL */
3951 /* Log the arguments of the call if the configuration file said so. This is
3952 a debugging feature for finding out what arguments certain MUAs actually use.
3953 Don't attempt it if logging is disabled, or if listing variables or if
3954 verifying/testing addresses or expansions. */
3956 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3957 && really_exim && !list_options && !checking)
3960 uschar *p = big_buffer;
3962 Ustrcpy(p, "cwd= (failed)");
3963 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3965 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3967 for (i = 0; i < argc; i++)
3969 int len = Ustrlen(argv[i]);
3972 if (p + len + 8 >= big_buffer + big_buffer_size)
3975 log_write(0, LOG_MAIN, "%s", big_buffer);
3976 Ustrcpy(big_buffer, "...");
3979 printing = string_printing(argv[i]);
3980 if (printing[0] == 0) quote = US"\""; else
3982 uschar *pp = printing;
3984 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3986 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3987 (p - big_buffer) - 4), printing, quote);
3991 if ((log_extra_selector & LX_arguments) != 0)
3992 log_write(0, LOG_MAIN, "%s", big_buffer);
3994 debug_printf("%s\n", big_buffer);
3997 /* Set the working directory to be the top-level spool directory. We don't rely
3998 on this in the code, which always uses fully qualified names, but it's useful
3999 for core dumps etc. Don't complain if it fails - the spool directory might not
4000 be generally accessible and calls with the -C option (and others) have lost
4001 privilege by now. Before the chdir, we try to ensure that the directory exists.
4004 if (Uchdir(spool_directory) != 0)
4007 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4008 dummy = /* quieten compiler */ Uchdir(spool_directory);
4011 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4012 alias file. Exim doesn't have such a concept, but this call is screwed into
4013 Sun's YP makefiles. Handle this by calling a configured script, as the real
4014 user who called Exim. The -oA option can be used to pass an argument to the
4019 (void)fclose(config_file);
4020 if (bi_command != NULL)
4024 argv[i++] = bi_command;
4025 if (alias_arg != NULL) argv[i++] = alias_arg;
4028 setgroups(group_count, group_list);
4029 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4031 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4032 (argv[1] == NULL)? US"" : argv[1]);
4034 execv(CS argv[0], (char *const *)argv);
4035 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4040 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4045 /* We moved the admin/trusted check to be immediately after reading the
4046 configuration file. We leave these prints here to ensure that syslog setup,
4047 logfile setup, and so on has already happened. */
4049 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4050 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4052 /* Only an admin user may start the daemon or force a queue run in the default
4053 configuration, but the queue run restriction can be relaxed. Only an admin
4054 user may request that a message be returned to its sender forthwith. Only an
4055 admin user may specify a debug level greater than D_v (because it might show
4056 passwords, etc. in lookup queries). Only an admin user may request a queue
4057 count. Only an admin user can use the test interface to scan for email
4058 (because Exim will be in the spool dir and able to look at mails). */
4062 BOOL debugset = (debug_selector & ~D_v) != 0;
4063 if (deliver_give_up || daemon_listen || malware_test_file ||
4064 (count_queue && queue_list_requires_admin) ||
4065 (list_queue && queue_list_requires_admin) ||
4066 (queue_interval >= 0 && prod_requires_admin) ||
4067 (debugset && !running_in_test_harness))
4069 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4074 /* If the real user is not root or the exim uid, the argument for passing
4075 in an open TCP/IP connection for another message is not permitted, nor is
4076 running with the -N option for any delivery action, unless this call to exim is
4077 one that supplied an input message, or we are using a patched exim for
4078 regression testing. */
4080 if (real_uid != root_uid && real_uid != exim_uid &&
4081 (continue_hostname != NULL ||
4083 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
4084 )) && !running_in_test_harness)
4086 fprintf(stderr, "exim: Permission denied\n");
4087 return EXIT_FAILURE;
4090 /* If the caller is not trusted, certain arguments are ignored when running for
4091 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4092 Note that authority for performing certain actions on messages is tested in the
4093 queue_action() function. */
4095 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
4097 sender_host_name = sender_host_address = interface_address =
4098 sender_ident = received_protocol = NULL;
4099 sender_host_port = interface_port = 0;
4100 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4103 /* If a sender host address is set, extract the optional port number off the
4104 end of it and check its syntax. Do the same thing for the interface address.
4105 Exim exits if the syntax is bad. */
4109 if (sender_host_address != NULL)
4110 sender_host_port = check_port(sender_host_address);
4111 if (interface_address != NULL)
4112 interface_port = check_port(interface_address);
4115 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4120 suppress_local_fixups = suppress_local_fixups_default = TRUE;
4121 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4125 fprintf(stderr, "exim: permission denied (-G requires a trusted user)\n");
4126 return EXIT_FAILURE;
4130 /* If an SMTP message is being received check to see if the standard input is a
4131 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4132 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4137 union sockaddr_46 inetd_sock;
4138 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4139 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4141 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4142 if (family == AF_INET || family == AF_INET6)
4144 union sockaddr_46 interface_sock;
4145 size = sizeof(interface_sock);
4147 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4148 interface_address = host_ntoa(-1, &interface_sock, NULL,
4151 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4153 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4156 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4157 NULL, &sender_host_port);
4158 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4159 "inetd is not supported when mua_wrapper is set");
4164 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4165 return EXIT_FAILURE;
4171 /* If the load average is going to be needed while receiving a message, get it
4172 now for those OS that require the first call to os_getloadavg() to be done as
4173 root. There will be further calls later for each message received. */
4175 #ifdef LOAD_AVG_NEEDS_ROOT
4176 if (receiving_message &&
4177 (queue_only_load >= 0 ||
4178 (is_inetd && smtp_load_reserve >= 0)
4181 load_average = OS_GETLOADAVG();
4185 /* The queue_only configuration option can be overridden by -odx on the command
4186 line, except that if queue_only_override is false, queue_only cannot be unset
4187 from the command line. */
4189 if (queue_only_set && (queue_only_override || arg_queue_only))
4190 queue_only = arg_queue_only;
4192 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4195 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4196 if (arg_smtp_receive_timeout >= 0)
4197 smtp_receive_timeout = arg_smtp_receive_timeout;
4199 /* If Exim was started with root privilege, unless we have already removed the
4200 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4201 except when starting the daemon or doing some kind of delivery or address
4202 testing (-bt). These are the only cases when root need to be retained. We run
4203 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4204 retained only for starting the daemon. We always do the initgroups() in this
4205 situation (controlled by the TRUE below), in order to be as close as possible
4206 to the state Exim usually runs in. */
4208 if (!unprivileged && /* originally had root AND */
4209 !removed_privilege && /* still got root AND */
4210 !daemon_listen && /* not starting the daemon */
4211 queue_interval <= 0 && /* (either kind of daemon) */
4213 deliver_drop_privilege || /* requested unprivileged */
4215 queue_interval < 0 && /* not running the queue */
4216 (msg_action_arg < 0 || /* and */
4217 msg_action != MSG_DELIVER) && /* not delivering and */
4218 (!checking || !address_test_mode) /* not address checking */
4222 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4225 /* When we are retaining a privileged uid, we still change to the exim gid. */
4230 rv = setgid(exim_gid);
4231 /* Impact of failure is that some stuff might end up with an incorrect group.
4232 We track this for failures from root, since any attempt to change privilege
4233 by root should succeed and failures should be examined. For non-root,
4234 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4235 no need to complain then. */
4238 if (!(unprivileged || removed_privilege))
4241 "exim: changing group failed: %s\n", strerror(errno));
4245 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4246 (long int)exim_gid, strerror(errno));
4250 /* Handle a request to scan a file for malware */
4251 if (malware_test_file)
4253 #ifdef WITH_CONTENT_SCAN
4255 set_process_info("scanning file for malware");
4256 result = malware_in_file(malware_test_file);
4259 printf("No malware found.\n");
4264 printf("Malware lookup returned non-okay/fail: %d\n", result);
4268 printf("Malware found: %s\n", malware_name);
4270 printf("Malware scan detected malware of unknown name.\n");
4272 printf("Malware scanning not enabled at compile time.\n");
4277 /* Handle a request to list the delivery queue */
4281 set_process_info("listing the queue");
4282 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4286 /* Handle a request to count the delivery queue */
4290 set_process_info("counting the queue");
4295 /* Handle actions on specific messages, except for the force delivery and
4296 message load actions, which are done below. Some actions take a whole list of
4297 message ids, which are known to continue up to the end of the arguments. Others
4298 take a single message id and then operate on the recipients list. */
4300 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4302 int yield = EXIT_SUCCESS;
4303 set_process_info("acting on specified messages");
4305 if (!one_msg_action)
4307 for (i = msg_action_arg; i < argc; i++)
4308 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4309 yield = EXIT_FAILURE;
4312 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4313 recipients_arg)) yield = EXIT_FAILURE;
4317 /* We used to set up here to skip reading the ACL section, on
4318 (msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen)
4319 Now, since the intro of the ${acl } expansion, ACL definitions may be
4320 needed in transports so we lost the optimisation. */
4324 /* The configuration data will have been read into POOL_PERM because we won't
4325 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4326 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4327 configuration were read into POOL_MAIN, because we don't do any resets till
4328 later on. However, it seems right, and it does ensure that both pools get used.
4331 store_pool = POOL_MAIN;
4333 /* Handle the -brt option. This is for checking out retry configurations.
4334 The next three arguments are a domain name or a complete address, and
4335 optionally two error numbers. All it does is to call the function that
4336 scans the retry configuration data. */
4338 if (test_retry_arg >= 0)
4340 retry_config *yield;
4341 int basic_errno = 0;
4345 if (test_retry_arg >= argc)
4347 printf("-brt needs a domain or address argument\n");
4348 exim_exit(EXIT_FAILURE);
4350 s1 = argv[test_retry_arg++];
4353 /* If the first argument contains no @ and no . it might be a local user
4354 or it might be a single-component name. Treat as a domain. */
4356 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4358 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4359 "being \ntreated as a one-component domain, not as a local part.\n\n",
4363 /* There may be an optional second domain arg. */
4365 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4366 s2 = argv[test_retry_arg++];
4368 /* The final arg is an error name */
4370 if (test_retry_arg < argc)
4372 uschar *ss = argv[test_retry_arg];
4374 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4377 printf("%s\n", CS error);
4378 return EXIT_FAILURE;
4381 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4382 code > 100 as an error is for matching codes to the decade. Turn them into
4383 a real error code, off the decade. */
4385 if (basic_errno == ERRNO_MAIL4XX ||
4386 basic_errno == ERRNO_RCPT4XX ||
4387 basic_errno == ERRNO_DATA4XX)
4389 int code = (more_errno >> 8) & 255;
4391 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4392 else if (code > 100)
4393 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4397 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4398 if (yield == NULL) printf("No retry information found\n"); else
4401 more_errno = yield->more_errno;
4402 printf("Retry rule: %s ", yield->pattern);
4404 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4406 printf("quota%s%s ",
4407 (more_errno > 0)? "_" : "",
4408 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4410 else if (yield->basic_errno == ECONNREFUSED)
4412 printf("refused%s%s ",
4413 (more_errno > 0)? "_" : "",
4414 (more_errno == 'M')? "MX" :
4415 (more_errno == 'A')? "A" : "");
4417 else if (yield->basic_errno == ETIMEDOUT)
4420 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4422 if (more_errno != 0) printf("_%s",
4423 (more_errno == 'M')? "MX" : "A");
4426 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4427 printf("auth_failed ");
4430 for (r = yield->rules; r != NULL; r = r->next)
4432 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4433 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4439 printf(",%d.", x/1000);
4453 exim_exit(EXIT_SUCCESS);
4456 /* Handle a request to list one or more configuration options */
4457 /* If -n was set, we suppress some information */
4461 set_process_info("listing variables");
4462 if (recipients_arg >= argc) readconf_print(US"all", NULL, flag_n);
4463 else for (i = recipients_arg; i < argc; i++)
4466 (Ustrcmp(argv[i], "router") == 0 ||
4467 Ustrcmp(argv[i], "transport") == 0 ||
4468 Ustrcmp(argv[i], "authenticator") == 0 ||
4469 Ustrcmp(argv[i], "macro") == 0))
4471 readconf_print(argv[i+1], argv[i], flag_n);
4474 else readconf_print(argv[i], NULL, flag_n);
4476 exim_exit(EXIT_SUCCESS);
4480 /* Handle a request to deliver one or more messages that are already on the
4481 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4482 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4484 Delivery of specific messages is typically used for a small number when
4485 prodding by hand (when the option forced_delivery will be set) or when
4486 re-execing to regain root privilege. Each message delivery must happen in a
4487 separate process, so we fork a process for each one, and run them sequentially
4488 so that debugging output doesn't get intertwined, and to avoid spawning too
4489 many processes if a long list is given. However, don't fork for the last one;
4490 this saves a process in the common case when Exim is called to deliver just one
4493 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4495 if (prod_requires_admin && !admin_user)
4497 fprintf(stderr, "exim: Permission denied\n");
4498 exim_exit(EXIT_FAILURE);
4500 set_process_info("delivering specified messages");
4501 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4502 for (i = msg_action_arg; i < argc; i++)
4507 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4508 else if ((pid = fork()) == 0)
4510 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4511 _exit(EXIT_SUCCESS);
4515 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4517 exim_exit(EXIT_FAILURE);
4521 exim_exit(EXIT_SUCCESS);
4525 /* If only a single queue run is requested, without SMTP listening, we can just
4526 turn into a queue runner, with an optional starting message id. */
4528 if (queue_interval == 0 && !daemon_listen)
4530 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4531 (start_queue_run_id == NULL)? US"" : US" starting at ",
4532 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4533 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4534 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4535 set_process_info("running the queue (single queue run)");
4536 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4537 exim_exit(EXIT_SUCCESS);
4541 /* Find the login name of the real user running this process. This is always
4542 needed when receiving a message, because it is written into the spool file. It
4543 may also be used to construct a from: or a sender: header, and in this case we
4544 need the user's full name as well, so save a copy of it, checked for RFC822
4545 syntax and munged if necessary, if it hasn't previously been set by the -F
4546 argument. We may try to get the passwd entry more than once, in case NIS or
4547 other delays are in evidence. Save the home directory for use in filter testing
4552 if ((pw = getpwuid(real_uid)) != NULL)
4554 originator_login = string_copy(US pw->pw_name);
4555 originator_home = string_copy(US pw->pw_dir);
4557 /* If user name has not been set by -F, set it from the passwd entry
4558 unless -f has been used to set the sender address by a trusted user. */
4560 if (originator_name == NULL)
4562 if (sender_address == NULL ||
4563 (!trusted_caller && filter_test == FTEST_NONE))
4565 uschar *name = US pw->pw_gecos;
4566 uschar *amp = Ustrchr(name, '&');
4569 /* Most Unix specify that a '&' character in the gecos field is
4570 replaced by a copy of the login name, and some even specify that
4571 the first character should be upper cased, so that's what we do. */
4576 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4577 amp - name, name, &loffset, originator_login, amp + 1);
4578 buffer[loffset] = toupper(buffer[loffset]);
4582 /* If a pattern for matching the gecos field was supplied, apply
4583 it and then expand the name string. */
4585 if (gecos_pattern != NULL && gecos_name != NULL)
4588 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4590 if (regex_match_and_setup(re, name, 0, -1))
4592 uschar *new_name = expand_string(gecos_name);
4594 if (new_name != NULL)
4596 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4597 "gecos field \"%s\"\n", new_name, name);
4600 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4601 "\"%s\": %s\n", gecos_name, expand_string_message);
4603 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4604 "gecos field \"%s\"\n", gecos_pattern, name);
4605 store_free((void *)re);
4607 originator_name = string_copy(name);
4610 /* A trusted caller has used -f but not -F */
4612 else originator_name = US"";
4615 /* Break the retry loop */
4620 if (++i > finduser_retries) break;
4624 /* If we cannot get a user login, log the incident and give up, unless the
4625 configuration specifies something to use. When running in the test harness,
4626 any setting of unknown_login overrides the actual name. */
4628 if (originator_login == NULL || running_in_test_harness)
4630 if (unknown_login != NULL)
4632 originator_login = expand_string(unknown_login);
4633 if (originator_name == NULL && unknown_username != NULL)
4634 originator_name = expand_string(unknown_username);
4635 if (originator_name == NULL) originator_name = US"";
4637 if (originator_login == NULL)
4638 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4642 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4645 originator_name = string_copy(parse_fix_phrase(originator_name,
4646 Ustrlen(originator_name), big_buffer, big_buffer_size));
4648 /* If a message is created by this call of Exim, the uid/gid of its originator
4649 are those of the caller. These values are overridden if an existing message is
4650 read in from the spool. */
4652 originator_uid = real_uid;
4653 originator_gid = real_gid;
4655 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4656 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4658 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4659 returns. We leave this till here so that the originator_ fields are available
4660 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4663 if (daemon_listen || inetd_wait_mode || queue_interval > 0)
4667 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4668 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4669 "mua_wrapper is set");
4674 /* If the sender ident has not been set (by a trusted caller) set it to
4675 the caller. This will get overwritten below for an inetd call. If a trusted
4676 caller has set it empty, unset it. */
4678 if (sender_ident == NULL) sender_ident = originator_login;
4679 else if (sender_ident[0] == 0) sender_ident = NULL;
4681 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4682 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4683 originator_* variables set. */
4685 if (test_rewrite_arg >= 0)
4687 really_exim = FALSE;
4688 if (test_rewrite_arg >= argc)
4690 printf("-brw needs an address argument\n");
4691 exim_exit(EXIT_FAILURE);
4693 rewrite_test(argv[test_rewrite_arg]);
4694 exim_exit(EXIT_SUCCESS);
4697 /* A locally-supplied message is considered to be coming from a local user
4698 unless a trusted caller supplies a sender address with -f, or is passing in the
4699 message via SMTP (inetd invocation or otherwise). */
4701 if ((sender_address == NULL && !smtp_input) ||
4702 (!trusted_caller && filter_test == FTEST_NONE))
4704 sender_local = TRUE;
4706 /* A trusted caller can supply authenticated_sender and authenticated_id
4707 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4708 defaults except when host checking. */
4710 if (authenticated_sender == NULL && !host_checking)
4711 authenticated_sender = string_sprintf("%s@%s", originator_login,
4712 qualify_domain_sender);
4713 if (authenticated_id == NULL && !host_checking)
4714 authenticated_id = originator_login;
4717 /* Trusted callers are always permitted to specify the sender address.
4718 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4719 is specified is the empty address. However, if a trusted caller does not
4720 specify a sender address for SMTP input, we leave sender_address unset. This
4721 causes the MAIL commands to be honoured. */
4723 if ((!smtp_input && sender_address == NULL) ||
4724 !receive_check_set_sender(sender_address))
4726 /* Either the caller is not permitted to set a general sender, or this is
4727 non-SMTP input and the trusted caller has not set a sender. If there is no
4728 sender, or if a sender other than <> is set, override with the originator's
4729 login (which will get qualified below), except when checking things. */
4731 if (sender_address == NULL /* No sender_address set */
4733 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4734 !checking && /* Not running tests, AND */
4735 filter_test == FTEST_NONE)) /* Not testing a filter */
4737 sender_address = originator_login;
4738 sender_address_forced = FALSE;
4739 sender_address_domain = 0;
4743 /* Remember whether an untrusted caller set the sender address */
4745 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4747 /* Ensure that the sender address is fully qualified unless it is the empty
4748 address, which indicates an error message, or doesn't exist (root caller, smtp
4749 interface, no -f argument). */
4751 if (sender_address != NULL && sender_address[0] != 0 &&
4752 sender_address_domain == 0)
4753 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4754 qualify_domain_sender);
4756 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4758 /* Handle a request to verify a list of addresses, or test them for delivery.
4759 This must follow the setting of the sender address, since routers can be
4760 predicated upon the sender. If no arguments are given, read addresses from
4761 stdin. Set debug_level to at least D_v to get full output for address testing.
4764 if (verify_address_mode || address_test_mode)
4767 int flags = vopt_qualify;
4769 if (verify_address_mode)
4771 if (!verify_as_sender) flags |= vopt_is_recipient;
4772 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4777 flags |= vopt_is_recipient;
4778 debug_selector |= D_v;
4779 debug_file = stderr;
4780 debug_fd = fileno(debug_file);
4781 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4784 if (recipients_arg < argc)
4786 while (recipients_arg < argc)
4788 uschar *s = argv[recipients_arg++];
4791 BOOL finished = FALSE;
4792 uschar *ss = parse_find_address_end(s, FALSE);
4793 if (*ss == ',') *ss = 0; else finished = TRUE;
4794 test_address(s, flags, &exit_value);
4797 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4804 uschar *s = get_stdinput(NULL, NULL);
4805 if (s == NULL) break;
4806 test_address(s, flags, &exit_value);
4810 exim_exit(exit_value);
4813 /* Handle expansion checking. Either expand items on the command line, or read
4814 from stdin if there aren't any. If -Mset was specified, load the message so
4815 that its variables can be used, but restrict this facility to admin users.
4816 Otherwise, if -bem was used, read a message from stdin. */
4820 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4822 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4825 fprintf(stderr, "exim: permission denied\n");
4828 message_id = argv[msg_action_arg];
4829 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4830 if (!spool_open_datafile(message_id))
4831 printf ("Failed to load message datafile %s\n", message_id);
4832 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4833 printf ("Failed to load message %s\n", message_id);
4836 /* Read a test message from a file. We fudge it up to be on stdin, saving
4837 stdin itself for later reading of expansion strings. */
4839 else if (expansion_test_message != NULL)
4841 int save_stdin = dup(0);
4842 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4845 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4847 return EXIT_FAILURE;
4850 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4851 message_ended = END_NOTENDED;
4852 read_message_body(receive_msg(extract_recipients));
4853 message_linecount += body_linecount;
4854 (void)dup2(save_stdin, 0);
4855 (void)close(save_stdin);
4856 clearerr(stdin); /* Required by Darwin */
4859 /* Allow $recipients for this testing */
4861 enable_dollar_recipients = TRUE;
4863 /* Expand command line items */
4865 if (recipients_arg < argc)
4867 while (recipients_arg < argc)
4869 uschar *s = argv[recipients_arg++];
4870 uschar *ss = expand_string(s);
4871 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4872 else printf("%s\n", CS ss);
4880 char *(*fn_readline)(const char *) = NULL;
4881 void (*fn_addhist)(const char *) = NULL;
4884 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4890 uschar *source = get_stdinput(fn_readline, fn_addhist);
4891 if (source == NULL) break;
4892 ss = expand_string(source);
4894 printf ("Failed: %s\n", expand_string_message);
4895 else printf("%s\n", CS ss);
4899 if (dlhandle != NULL) dlclose(dlhandle);
4903 /* The data file will be open after -Mset */
4905 if (deliver_datafile >= 0)
4907 (void)close(deliver_datafile);
4908 deliver_datafile = -1;
4911 exim_exit(EXIT_SUCCESS);
4915 /* The active host name is normally the primary host name, but it can be varied
4916 for hosts that want to play several parts at once. We need to ensure that it is
4917 set for host checking, and for receiving messages. */
4919 smtp_active_hostname = primary_hostname;
4920 if (raw_active_hostname != NULL)
4922 uschar *nah = expand_string(raw_active_hostname);
4925 if (!expand_string_forcedfail)
4926 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4927 "(smtp_active_hostname): %s", raw_active_hostname,
4928 expand_string_message);
4930 else if (nah[0] != 0) smtp_active_hostname = nah;
4933 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4934 given IP address so that the blocking and relay configuration can be tested.
4935 Unless a sender_ident was set by -oMt, we discard it (the default is the
4936 caller's login name). An RFC 1413 call is made only if we are running in the
4937 test harness and an incoming interface and both ports are specified, because
4938 there is no TCP/IP call to find the ident for. */
4945 if (!sender_ident_set)
4947 sender_ident = NULL;
4948 if (running_in_test_harness && sender_host_port != 0 &&
4949 interface_address != NULL && interface_port != 0)
4950 verify_get_ident(1413);
4953 /* In case the given address is a non-canonical IPv6 address, canonicize
4954 it. The code works for both IPv4 and IPv6, as it happens. */
4956 size = host_aton(sender_host_address, x);
4957 sender_host_address = store_get(48); /* large enough for full IPv6 */
4958 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4960 /* Now set up for testing */
4962 host_build_sender_fullhost();
4966 sender_local = FALSE;
4967 sender_host_notsocket = TRUE;
4968 debug_file = stderr;
4969 debug_fd = fileno(debug_file);
4970 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4971 "**** but without any ident (RFC 1413) callback.\n"
4972 "**** This is not for real!\n\n",
4973 sender_host_address);
4975 if (verify_check_host(&hosts_connection_nolog) == OK)
4976 log_write_selector &= ~L_smtp_connection;
4977 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4979 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4980 because a log line has already been written for all its failure exists
4981 (usually "connection refused: <reason>") and writing another one is
4982 unnecessary clutter. */
4984 if (smtp_start_session())
4986 reset_point = store_get(0);
4989 store_reset(reset_point);
4990 if (smtp_setup_msg() <= 0) break;
4991 if (!receive_msg(FALSE)) break;
4995 exim_exit(EXIT_SUCCESS);
4999 /* Arrange for message reception if recipients or SMTP were specified;
5000 otherwise complain unless a version print (-bV) happened or this is a filter
5001 verification test or info dump.
5002 In the former case, show the configuration file name. */
5004 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5006 if (version_printed)
5008 printf("Configuration file is %s\n", config_main_filename);
5009 return EXIT_SUCCESS;
5012 if (info_flag != CMDINFO_NONE)
5014 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5015 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5018 if (filter_test == FTEST_NONE)
5019 exim_usage(called_as);
5023 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5024 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5025 that we are not called from inetd, because that is rejected above. The
5026 following configuration settings are forced here:
5028 (1) Synchronous delivery (-odi)
5029 (2) Errors to stderr (-oep == -oeq)
5030 (3) No parallel remote delivery
5031 (4) Unprivileged delivery
5033 We don't force overall queueing options because there are several of them;
5034 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5035 to override any SMTP queueing. */
5039 synchronous_delivery = TRUE;
5040 arg_error_handling = ERRORS_STDERR;
5041 remote_max_parallel = 1;
5042 deliver_drop_privilege = TRUE;
5044 queue_smtp_domains = NULL;
5048 /* Prepare to accept one or more new messages on the standard input. When a
5049 message has been read, its id is returned in message_id[]. If doing immediate
5050 delivery, we fork a delivery process for each received message, except for the
5051 last one, where we can save a process switch.
5053 It is only in non-smtp mode that error_handling is allowed to be changed from
5054 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5055 sendmail error modes other than -oem ever actually used? Later: yes.) */
5057 if (!smtp_input) error_handling = arg_error_handling;
5059 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5060 logging being sent down the socket and make an identd call to get the
5065 (void)fclose(stderr);
5066 exim_nullstd(); /* Re-open to /dev/null */
5067 verify_get_ident(IDENT_PORT);
5068 host_build_sender_fullhost();
5069 set_process_info("handling incoming connection from %s via inetd",
5073 /* If the sender host address has been set, build sender_fullhost if it hasn't
5074 already been done (which it will have been for inetd). This caters for the
5075 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5076 so that the test for IP options is skipped for -bs input. */
5078 if (sender_host_address != NULL && sender_fullhost == NULL)
5080 host_build_sender_fullhost();
5081 set_process_info("handling incoming connection from %s via -oMa",
5083 sender_host_notsocket = TRUE;
5086 /* Otherwise, set the sender host as unknown except for inetd calls. This
5087 prevents host checking in the case of -bs not from inetd and also for -bS. */
5089 else if (!is_inetd) sender_host_unknown = TRUE;
5091 /* If stdout does not exist, then dup stdin to stdout. This can happen
5092 if exim is started from inetd. In this case fd 0 will be set to the socket,
5093 but fd 1 will not be set. This also happens for passed SMTP channels. */
5095 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5097 /* Set up the incoming protocol name and the state of the program. Root is
5098 allowed to force received protocol via the -oMr option above. If we have come
5099 via inetd, the process info has already been set up. We don't set
5100 received_protocol here for smtp input, as it varies according to
5101 batch/HELO/EHLO/AUTH/TLS. */
5105 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5106 smtp_batched_input? "batched " : "",
5107 (sender_address!= NULL)? sender_address : originator_login);
5111 if (received_protocol == NULL)
5112 received_protocol = string_sprintf("local%s", called_as);
5113 set_process_info("accepting a local non-SMTP message from <%s>",
5117 /* Initialize the session_local_queue-only flag (this will be ignored if
5118 mua_wrapper is set) */
5121 session_local_queue_only = queue_only;
5123 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5124 the spool if so configured. On failure, we must not attempt to send an error
5125 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5126 error code is given.) */
5128 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5130 fprintf(stderr, "exim: insufficient disk space\n");
5131 return EXIT_FAILURE;
5134 /* If this is smtp input of any kind, real or batched, handle the start of the
5137 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5138 because a log line has already been written for all its failure exists
5139 (usually "connection refused: <reason>") and writing another one is
5140 unnecessary clutter. */
5146 if (verify_check_host(&hosts_connection_nolog) == OK)
5147 log_write_selector &= ~L_smtp_connection;
5148 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5149 if (!smtp_start_session())
5152 exim_exit(EXIT_SUCCESS);
5156 /* Otherwise, set up the input size limit here. */
5160 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5161 if (expand_string_message != NULL)
5163 if (thismessage_size_limit == -1)
5164 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5165 "message_size_limit: %s", expand_string_message);
5167 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5168 "message_size_limit: %s", expand_string_message);
5172 /* Loop for several messages when reading SMTP input. If we fork any child
5173 processes, we don't want to wait for them unless synchronous delivery is
5174 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5175 same as SIG_DFL, despite the fact that documentation often lists the default as
5176 "ignore". This is a confusing area. This is what I know:
5178 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5179 processes that complete simply to go away without ever becoming defunct. You
5180 can't then wait for them - but we don't want to wait for them in the
5181 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5182 happen for all OS (e.g. *BSD is different).
5184 But that's not the end of the story. Some (many? all?) systems have the
5185 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5186 has by default, so it seems that the difference is merely one of default
5187 (compare restarting vs non-restarting signals).
5189 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5190 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5191 of the loop below. Paranoia rules.
5193 February 2003: That's *still* not the end of the story. There are now versions
5194 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5195 process then calls waitpid(), a grumble is written to the system log, because
5196 this is logically inconsistent. In other words, it doesn't like the paranoia.
5197 As a consequenc of this, the waitpid() below is now excluded if we are sure
5198 that SIG_IGN works. */
5200 if (!synchronous_delivery)
5203 struct sigaction act;
5204 act.sa_handler = SIG_IGN;
5205 sigemptyset(&(act.sa_mask));
5206 act.sa_flags = SA_NOCLDWAIT;
5207 sigaction(SIGCHLD, &act, NULL);
5209 signal(SIGCHLD, SIG_IGN);
5213 /* Save the current store pool point, for resetting at the start of
5214 each message, and save the real sender address, if any. */
5216 reset_point = store_get(0);
5217 real_sender_address = sender_address;
5219 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5220 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5225 store_reset(reset_point);
5228 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5229 input and build the recipients list, before calling receive_msg() to read the
5230 message proper. Whatever sender address is given in the SMTP transaction is
5231 often ignored for local senders - we use the actual sender, which is normally
5232 either the underlying user running this process or a -f argument provided by
5233 a trusted caller. It is saved in real_sender_address. The test for whether to
5234 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5239 if ((rc = smtp_setup_msg()) > 0)
5241 if (real_sender_address != NULL &&
5242 !receive_check_set_sender(sender_address))
5244 sender_address = raw_sender = real_sender_address;
5245 sender_address_unrewritten = NULL;
5248 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5249 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5250 the very end. The result of the ACL is ignored (as for other non-SMTP
5251 messages). It is run for its potential side effects. */
5253 if (smtp_batched_input && acl_not_smtp_start != NULL)
5255 uschar *user_msg, *log_msg;
5256 enable_dollar_recipients = TRUE;
5257 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5258 &user_msg, &log_msg);
5259 enable_dollar_recipients = FALSE;
5262 /* Now get the data for the message */
5264 more = receive_msg(extract_recipients);
5265 if (message_id[0] == 0)
5268 smtp_log_no_mail(); /* Log no mail if configured */
5269 exim_exit(EXIT_FAILURE);
5274 smtp_log_no_mail(); /* Log no mail if configured */
5275 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
5279 /* In the non-SMTP case, we have all the information from the command
5280 line, but must process it in case it is in the more general RFC822
5281 format, and in any case, to detect syntax errors. Also, it appears that
5282 the use of comma-separated lists as single arguments is common, so we
5283 had better support them. */
5289 int count = argc - recipients_arg;
5290 uschar **list = argv + recipients_arg;
5292 /* These options cannot be changed dynamically for non-SMTP messages */
5294 active_local_sender_retain = local_sender_retain;
5295 active_local_from_check = local_from_check;
5297 /* Save before any rewriting */
5299 raw_sender = string_copy(sender_address);
5301 /* Loop for each argument */
5303 for (i = 0; i < count; i++)
5305 int start, end, domain;
5307 uschar *s = list[i];
5309 /* Loop for each comma-separated address */
5313 BOOL finished = FALSE;
5315 uschar *ss = parse_find_address_end(s, FALSE);
5317 if (*ss == ',') *ss = 0; else finished = TRUE;
5319 /* Check max recipients - if -t was used, these aren't recipients */
5321 if (recipients_max > 0 && ++rcount > recipients_max &&
5322 !extract_recipients)
5324 if (error_handling == ERRORS_STDERR)
5326 fprintf(stderr, "exim: too many recipients\n");
5327 exim_exit(EXIT_FAILURE);
5332 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5333 errors_sender_rc : EXIT_FAILURE;
5338 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5340 if (domain == 0 && !allow_unqualified_recipient)
5343 errmess = US"unqualified recipient address not allowed";
5346 if (recipient == NULL)
5348 if (error_handling == ERRORS_STDERR)
5350 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5351 string_printing(list[i]), errmess);
5352 exim_exit(EXIT_FAILURE);
5358 eblock.text1 = string_printing(list[i]);
5359 eblock.text2 = errmess;
5361 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5362 errors_sender_rc : EXIT_FAILURE;
5366 receive_add_recipient(recipient, -1);
5369 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5373 /* Show the recipients when debugging */
5378 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5379 if (recipients_list != NULL)
5381 debug_printf("Recipients:\n");
5382 for (i = 0; i < recipients_count; i++)
5383 debug_printf(" %s\n", recipients_list[i].address);
5387 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5388 ignored; rejecting here would just add complication, and it can just as
5389 well be done later. Allow $recipients to be visible in the ACL. */
5391 if (acl_not_smtp_start != NULL)
5393 uschar *user_msg, *log_msg;
5394 enable_dollar_recipients = TRUE;
5395 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5396 &user_msg, &log_msg);
5397 enable_dollar_recipients = FALSE;
5400 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5401 will just read the headers for the message, and not write anything onto the
5404 message_ended = END_NOTENDED;
5405 more = receive_msg(extract_recipients);
5407 /* more is always FALSE here (not SMTP message) when reading a message
5408 for real; when reading the headers of a message for filter testing,
5409 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5411 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5412 } /* Non-SMTP message reception */
5414 /* If this is a filter testing run, there are headers in store, but
5415 no message on the spool. Run the filtering code in testing mode, setting
5416 the domain to the qualify domain and the local part to the current user,
5417 unless they have been set by options. The prefix and suffix are left unset
5418 unless specified. The the return path is set to to the sender unless it has
5419 already been set from a return-path header in the message. */
5421 if (filter_test != FTEST_NONE)
5423 deliver_domain = (ftest_domain != NULL)?
5424 ftest_domain : qualify_domain_recipient;
5425 deliver_domain_orig = deliver_domain;
5426 deliver_localpart = (ftest_localpart != NULL)?
5427 ftest_localpart : originator_login;
5428 deliver_localpart_orig = deliver_localpart;
5429 deliver_localpart_prefix = ftest_prefix;
5430 deliver_localpart_suffix = ftest_suffix;
5431 deliver_home = originator_home;
5433 if (return_path == NULL)
5435 printf("Return-path copied from sender\n");
5436 return_path = string_copy(sender_address);
5440 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5442 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5444 receive_add_recipient(
5445 string_sprintf("%s%s%s@%s",
5446 (ftest_prefix == NULL)? US"" : ftest_prefix,
5448 (ftest_suffix == NULL)? US"" : ftest_suffix,
5449 deliver_domain), -1);
5451 printf("Recipient = %s\n", recipients_list[0].address);
5452 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5453 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5455 if (chdir("/")) /* Get away from wherever the user is running this from */
5457 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5458 exim_exit(EXIT_FAILURE);
5461 /* Now we run either a system filter test, or a user filter test, or both.
5462 In the latter case, headers added by the system filter will persist and be
5463 available to the user filter. We need to copy the filter variables
5466 if ((filter_test & FTEST_SYSTEM) != 0)
5468 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5469 exim_exit(EXIT_FAILURE);
5472 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5474 if ((filter_test & FTEST_USER) != 0)
5476 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5477 exim_exit(EXIT_FAILURE);
5480 exim_exit(EXIT_SUCCESS);
5483 /* Else act on the result of message reception. We should not get here unless
5484 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5485 will be TRUE. If it is not, check on the number of messages received in this
5488 if (!session_local_queue_only &&
5489 smtp_accept_queue_per_connection > 0 &&
5490 receive_messagecount > smtp_accept_queue_per_connection)
5492 session_local_queue_only = TRUE;
5493 queue_only_reason = 2;
5496 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5497 and queue_only_load is set, check that the load average is below it. If it is
5498 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5499 default), we put the whole session into queue_only mode. It then remains this
5500 way for any subsequent messages on the same SMTP connection. This is a
5501 deliberate choice; even though the load average may fall, it doesn't seem
5502 right to deliver later messages on the same call when not delivering earlier
5503 ones. However, there are odd cases where this is not wanted, so this can be
5504 changed by setting queue_only_load_latch false. */
5506 local_queue_only = session_local_queue_only;
5507 if (!local_queue_only && queue_only_load >= 0)
5509 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5510 if (local_queue_only)
5512 queue_only_reason = 3;
5513 if (queue_only_load_latch) session_local_queue_only = TRUE;
5517 /* If running as an MUA wrapper, all queueing options and freezing options
5521 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5523 /* Log the queueing here, when it will get a message id attached, but
5524 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5527 if (local_queue_only) switch(queue_only_reason)
5530 log_write(L_delay_delivery,
5531 LOG_MAIN, "no immediate delivery: more than %d messages "
5532 "received in one connection", smtp_accept_queue_per_connection);
5536 log_write(L_delay_delivery,
5537 LOG_MAIN, "no immediate delivery: load average %.2f",
5538 (double)load_average/1000.0);
5542 /* Else do the delivery unless the ACL or local_scan() called for queue only
5543 or froze the message. Always deliver in a separate process. A fork failure is
5544 not a disaster, as the delivery will eventually happen on a subsequent queue
5545 run. The search cache must be tidied before the fork, as the parent will
5546 do it before exiting. The child will trigger a lookup failure and
5547 thereby defer the delivery if it tries to use (for example) a cached ldap
5548 connection that the parent has called unbind on. */
5550 else if (!queue_only_policy && !deliver_freeze)
5555 if ((pid = fork()) == 0)
5558 close_unwanted(); /* Close unwanted file descriptors and TLS */
5559 exim_nullstd(); /* Ensure std{in,out,err} exist */
5561 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5562 mode, deliver_drop_privilege is forced TRUE). */
5564 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5566 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5568 /* Control does not return here. */
5571 /* No need to re-exec */
5573 rc = deliver_message(message_id, FALSE, FALSE);
5575 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5576 EXIT_SUCCESS : EXIT_FAILURE);
5581 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5582 "process: %s", strerror(errno));
5585 /* In the parent, wait if synchronous delivery is required. This will
5586 always be the case in MUA wrapper mode. */
5588 else if (synchronous_delivery)
5591 while (wait(&status) != pid);
5592 if ((status & 0x00ff) != 0)
5593 log_write(0, LOG_MAIN|LOG_PANIC,
5594 "process %d crashed with signal %d while delivering %s",
5595 (int)pid, status & 0x00ff, message_id);
5596 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5600 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5601 automatically reaps children (see comments above the loop), clear away any
5602 finished subprocesses here, in case there are lots of messages coming in
5603 from the same source. */
5605 #ifndef SIG_IGN_WORKS
5606 while (waitpid(-1, NULL, WNOHANG) > 0);
5610 exim_exit(EXIT_SUCCESS); /* Never returns */
5611 return 0; /* To stop compiler warning */