1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
17 extern void init_lookup_list(void);
21 /*************************************************
22 * Function interface to store functions *
23 *************************************************/
25 /* We need some real functions to pass to the PCRE regular expression library
26 for store allocation via Exim's store manager. The normal calls are actually
27 macros that pass over location information to make tracing easier. These
28 functions just interface to the standard macro calls. A good compiler will
29 optimize out the tail recursion and so not make them too expensive. There
30 are two sets of functions; one for use when we want to retain the compiled
31 regular expression for a long time; the other for short-term use. */
34 function_store_get(size_t size)
36 return store_get((int)size);
40 function_dummy_free(void *block) { block = block; }
43 function_store_malloc(size_t size)
45 return store_malloc((int)size);
49 function_store_free(void *block)
57 /*************************************************
58 * Compile regular expression and panic on fail *
59 *************************************************/
61 /* This function is called when failure to compile a regular expression leads
62 to a panic exit. In other cases, pcre_compile() is called directly. In many
63 cases where this function is used, the results of the compilation are to be
64 placed in long-lived store, so we temporarily reset the store management
65 functions that PCRE uses if the use_malloc flag is set.
68 pattern the pattern to compile
69 caseless TRUE if caseless matching is required
70 use_malloc TRUE if compile into malloc store
72 Returns: pointer to the compiled pattern
76 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
79 int options = PCRE_COPT;
84 pcre_malloc = function_store_malloc;
85 pcre_free = function_store_free;
87 if (caseless) options |= PCRE_CASELESS;
88 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
89 pcre_malloc = function_store_get;
90 pcre_free = function_dummy_free;
92 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
93 "%s at offset %d while compiling %s", error, offset, pattern);
100 /*************************************************
101 * Execute regular expression and set strings *
102 *************************************************/
104 /* This function runs a regular expression match, and sets up the pointers to
105 the matched substrings.
108 re the compiled expression
109 subject the subject string
110 options additional PCRE options
111 setup if < 0 do full setup
112 if >= 0 setup from setup+1 onwards,
113 excluding the full matched string
115 Returns: TRUE or FALSE
119 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
121 int ovector[3*(EXPAND_MAXN+1)];
122 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
123 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
125 if (n == 0) n = EXPAND_MAXN + 1;
129 expand_nmax = (setup < 0)? 0 : setup + 1;
130 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
132 expand_nstring[expand_nmax] = subject + ovector[nn];
133 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
143 /*************************************************
144 * Handler for SIGUSR1 *
145 *************************************************/
147 /* SIGUSR1 causes any exim process to write to the process log details of
148 what it is currently doing. It will only be used if the OS is capable of
149 setting up a handler that causes automatic restarting of any system call
150 that is in progress at the time.
152 Argument: the signal number (SIGUSR1)
157 usr1_handler(int sig)
159 sig = sig; /* Keep picky compilers happy */
160 log_write(0, LOG_PROCESS, "%s", process_info);
162 os_restarting_signal(SIGUSR1, usr1_handler);
167 /*************************************************
169 *************************************************/
171 /* This handler is enabled most of the time that Exim is running. The handler
172 doesn't actually get used unless alarm() has been called to set a timer, to
173 place a time limit on a system call of some kind. When the handler is run, it
176 There are some other SIGALRM handlers that are used in special cases when more
177 than just a flag setting is required; for example, when reading a message's
178 input. These are normally set up in the code module that uses them, and the
179 SIGALRM handler is reset to this one afterwards.
181 Argument: the signal value (SIGALRM)
186 sigalrm_handler(int sig)
188 sig = sig; /* Keep picky compilers happy */
190 os_non_restarting_signal(SIGALRM, sigalrm_handler);
195 /*************************************************
196 * Sleep for a fractional time interval *
197 *************************************************/
199 /* This function is called by millisleep() and exim_wait_tick() to wait for a
200 period of time that may include a fraction of a second. The coding is somewhat
201 tedious. We do not expect setitimer() ever to fail, but if it does, the process
202 will wait for ever, so we panic in this instance. (There was a case of this
203 when a bug in a function that calls milliwait() caused it to pass invalid data.
204 That's when I added the check. :-)
206 Argument: an itimerval structure containing the interval
211 milliwait(struct itimerval *itval)
214 sigset_t old_sigmask;
215 (void)sigemptyset(&sigmask); /* Empty mask */
216 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
217 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
218 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
219 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
220 "setitimer() failed: %s", strerror(errno));
221 (void)sigfillset(&sigmask); /* All signals */
222 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
223 (void)sigsuspend(&sigmask); /* Until SIGALRM */
224 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
230 /*************************************************
231 * Millisecond sleep function *
232 *************************************************/
234 /* The basic sleep() function has a granularity of 1 second, which is too rough
235 in some cases - for example, when using an increasing delay to slow down
238 Argument: number of millseconds
245 struct itimerval itval;
246 itval.it_interval.tv_sec = 0;
247 itval.it_interval.tv_usec = 0;
248 itval.it_value.tv_sec = msec/1000;
249 itval.it_value.tv_usec = (msec % 1000) * 1000;
255 /*************************************************
256 * Compare microsecond times *
257 *************************************************/
264 Returns: -1, 0, or +1
268 exim_tvcmp(struct timeval *t1, struct timeval *t2)
270 if (t1->tv_sec > t2->tv_sec) return +1;
271 if (t1->tv_sec < t2->tv_sec) return -1;
272 if (t1->tv_usec > t2->tv_usec) return +1;
273 if (t1->tv_usec < t2->tv_usec) return -1;
280 /*************************************************
281 * Clock tick wait function *
282 *************************************************/
284 /* Exim uses a time + a pid to generate a unique identifier in two places: its
285 message IDs, and in file names for maildir deliveries. Because some OS now
286 re-use pids within the same second, sub-second times are now being used.
287 However, for absolute certaintly, we must ensure the clock has ticked before
288 allowing the relevant process to complete. At the time of implementation of
289 this code (February 2003), the speed of processors is such that the clock will
290 invariably have ticked already by the time a process has done its job. This
291 function prepares for the time when things are faster - and it also copes with
292 clocks that go backwards.
295 then_tv A timeval which was used to create uniqueness; its usec field
296 has been rounded down to the value of the resolution.
297 We want to be sure the current time is greater than this.
298 resolution The resolution that was used to divide the microseconds
299 (1 for maildir, larger for message ids)
305 exim_wait_tick(struct timeval *then_tv, int resolution)
307 struct timeval now_tv;
308 long int now_true_usec;
310 (void)gettimeofday(&now_tv, NULL);
311 now_true_usec = now_tv.tv_usec;
312 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
314 if (exim_tvcmp(&now_tv, then_tv) <= 0)
316 struct itimerval itval;
317 itval.it_interval.tv_sec = 0;
318 itval.it_interval.tv_usec = 0;
319 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
320 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
322 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
323 negative value for the microseconds is possible only in the case when "now"
324 is more than a second less than "then". That means that itval.it_value.tv_sec
325 is greater than zero. The following correction is therefore safe. */
327 if (itval.it_value.tv_usec < 0)
329 itval.it_value.tv_usec += 1000000;
330 itval.it_value.tv_sec -= 1;
333 DEBUG(D_transport|D_receive)
335 if (!running_in_test_harness)
337 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
338 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
339 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
340 itval.it_value.tv_usec);
351 /*************************************************
352 * Set up processing details *
353 *************************************************/
355 /* Save a text string for dumping when SIGUSR1 is received.
356 Do checks for overruns.
358 Arguments: format and arguments, as for printf()
363 set_process_info(char *format, ...)
367 sprintf(CS process_info, "%5d ", (int)getpid());
368 len = Ustrlen(process_info);
369 va_start(ap, format);
370 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
371 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
372 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
380 /*************************************************
381 * Call fopen() with umask 777 and adjust mode *
382 *************************************************/
384 /* Exim runs with umask(0) so that files created with open() have the mode that
385 is specified in the open() call. However, there are some files, typically in
386 the spool directory, that are created with fopen(). They end up world-writeable
387 if no precautions are taken. Although the spool directory is not accessible to
388 the world, this is an untidiness. So this is a wrapper function for fopen()
389 that sorts out the mode of the created file.
392 filename the file name
393 options the fopen() options
394 mode the required mode
396 Returns: the fopened FILE or NULL
400 modefopen(uschar *filename, char *options, mode_t mode)
402 mode_t saved_umask = umask(0777);
403 FILE *f = Ufopen(filename, options);
404 (void)umask(saved_umask);
405 if (f != NULL) (void)fchmod(fileno(f), mode);
412 /*************************************************
413 * Ensure stdin, stdout, and stderr exist *
414 *************************************************/
416 /* Some operating systems grumble if an exec() happens without a standard
417 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
418 file will be opened and will use these fd values, and then some other bit of
419 code will assume, for example, that it can write error messages to stderr.
420 This function ensures that fds 0, 1, and 2 are open if they do not already
421 exist, by connecting them to /dev/null.
423 This function is also used to ensure that std{in,out,err} exist at all times,
424 so that if any library that Exim calls tries to use them, it doesn't crash.
436 for (i = 0; i <= 2; i++)
438 if (fstat(i, &statbuf) < 0 && errno == EBADF)
440 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
441 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
442 string_open_failed(errno, "/dev/null"));
443 if (devnull != i) (void)dup2(devnull, i);
446 if (devnull > 2) (void)close(devnull);
452 /*************************************************
453 * Close unwanted file descriptors for delivery *
454 *************************************************/
456 /* This function is called from a new process that has been forked to deliver
457 an incoming message, either directly, or using exec.
459 We want any smtp input streams to be closed in this new process. However, it
460 has been observed that using fclose() here causes trouble. When reading in -bS
461 input, duplicate copies of messages have been seen. The files will be sharing a
462 file pointer with the parent process, and it seems that fclose() (at least on
463 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
464 least sometimes. Hence we go for closing the underlying file descriptors.
466 If TLS is active, we want to shut down the TLS library, but without molesting
467 the parent's SSL connection.
469 For delivery of a non-SMTP message, we want to close stdin and stdout (and
470 stderr unless debugging) because the calling process might have set them up as
471 pipes and be waiting for them to close before it waits for the submission
472 process to terminate. If they aren't closed, they hold up the calling process
473 until the initial delivery process finishes, which is not what we want.
475 Exception: We do want it for synchronous delivery!
477 And notwithstanding all the above, if D_resolver is set, implying resolver
478 debugging, leave stdout open, because that's where the resolver writes its
481 When we close stderr (which implies we've also closed stdout), we also get rid
482 of any controlling terminal.
494 tls_close(FALSE); /* Shut down the TLS library */
496 (void)close(fileno(smtp_in));
497 (void)close(fileno(smtp_out));
502 (void)close(0); /* stdin */
503 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
504 if (debug_selector == 0) /* stderr */
506 if (!synchronous_delivery)
519 /*************************************************
521 *************************************************/
523 /* This function sets a new uid and gid permanently, optionally calling
524 initgroups() to set auxiliary groups. There are some special cases when running
525 Exim in unprivileged modes. In these situations the effective uid will not be
526 root; if we already have the right effective uid/gid, and don't need to
527 initialize any groups, leave things as they are.
532 igflag TRUE if initgroups() wanted
533 msg text to use in debugging output and failure log
535 Returns: nothing; bombs out on failure
539 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
541 uid_t euid = geteuid();
542 gid_t egid = getegid();
544 if (euid == root_uid || euid != uid || egid != gid || igflag)
546 /* At least one OS returns +1 for initgroups failure, so just check for
551 struct passwd *pw = getpwuid(uid);
554 if (initgroups(pw->pw_name, gid) != 0)
555 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
556 (long int)uid, strerror(errno));
558 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
559 "no passwd entry for uid=%ld", (long int)uid);
562 if (setgid(gid) < 0 || setuid(uid) < 0)
564 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
565 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
569 /* Debugging output included uid/gid and all groups */
574 gid_t group_list[NGROUPS_MAX];
575 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
576 (long int)geteuid(), (long int)getegid(), (long int)getpid());
577 group_count = getgroups(NGROUPS_MAX, group_list);
578 debug_printf(" auxiliary group list:");
582 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
584 else debug_printf(" <none>");
592 /*************************************************
594 *************************************************/
596 /* Exim exits via this function so that it always clears up any open
602 Returns: does not return
610 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
611 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
618 /*************************************************
619 * Extract port from host address *
620 *************************************************/
622 /* Called to extract the port from the values given to -oMa and -oMi.
623 It also checks the syntax of the address, and terminates it before the
624 port data when a port is extracted.
627 address the address, with possible port on the end
629 Returns: the port, or zero if there isn't one
630 bombs out on a syntax error
634 check_port(uschar *address)
636 int port = host_address_extract_port(address);
637 if (string_is_ip_address(address, NULL) == 0)
639 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
647 /*************************************************
648 * Test/verify an address *
649 *************************************************/
651 /* This function is called by the -bv and -bt code. It extracts a working
652 address from a full RFC 822 address. This isn't really necessary per se, but it
653 has the effect of collapsing source routes.
657 flags flag bits for verify_address()
658 exit_value to be set for failures
664 test_address(uschar *s, int flags, int *exit_value)
666 int start, end, domain;
667 uschar *parse_error = NULL;
668 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
672 fprintf(stdout, "syntax error: %s\n", parse_error);
677 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
678 -1, -1, NULL, NULL, NULL);
679 if (rc == FAIL) *exit_value = 2;
680 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
686 /*************************************************
687 * Show supported features *
688 *************************************************/
690 /* This function is called for -bV/--version and for -d to output the optional
691 features of the current Exim binary.
693 Arguments: a FILE for printing
698 show_whats_supported(FILE *f)
700 #ifdef DB_VERSION_STRING
701 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
702 #elif defined(BTREEVERSION) && defined(HASHVERSION)
704 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
706 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
708 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
709 fprintf(f, "Probably ndbm\n");
710 #elif defined(USE_TDB)
711 fprintf(f, "Using tdb\n");
714 fprintf(f, "Probably GDBM (native mode)\n");
716 fprintf(f, "Probably GDBM (compatibility mode)\n");
720 fprintf(f, "Support for:");
721 #ifdef SUPPORT_CRYPTEQ
722 fprintf(f, " crypteq");
725 fprintf(f, " iconv()");
730 #ifdef HAVE_SETCLASSRESOURCES
731 fprintf(f, " use_setclassresources");
740 fprintf(f, " Expand_dlfunc");
742 #ifdef USE_TCP_WRAPPERS
743 fprintf(f, " TCPwrappers");
747 fprintf(f, " GnuTLS");
749 fprintf(f, " OpenSSL");
752 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
753 fprintf(f, " translate_ip_address");
755 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
756 fprintf(f, " move_frozen_messages");
758 #ifdef WITH_CONTENT_SCAN
759 fprintf(f, " Content_Scanning");
764 #ifdef WITH_OLD_DEMIME
765 fprintf(f, " Old_Demime");
767 #ifdef EXPERIMENTAL_SPF
768 fprintf(f, " Experimental_SPF");
770 #ifdef EXPERIMENTAL_SRS
771 fprintf(f, " Experimental_SRS");
773 #ifdef EXPERIMENTAL_BRIGHTMAIL
774 fprintf(f, " Experimental_Brightmail");
776 #ifdef EXPERIMENTAL_DCC
777 fprintf(f, " Experimental_DCC");
781 fprintf(f, "Lookups (built-in):");
782 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
783 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
785 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
788 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
789 fprintf(f, " dbm dbmnz");
791 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
792 fprintf(f, " dnsdb");
794 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
795 fprintf(f, " dsearch");
797 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
798 fprintf(f, " ibase");
800 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
801 fprintf(f, " ldap ldapdn ldapm");
803 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
804 fprintf(f, " mysql");
806 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
807 fprintf(f, " nis nis0");
809 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
810 fprintf(f, " nisplus");
812 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
813 fprintf(f, " oracle");
815 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
816 fprintf(f, " passwd");
818 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
819 fprintf(f, " pgsql");
821 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
822 fprintf(f, " sqlite");
824 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
825 fprintf(f, " testdb");
827 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
828 fprintf(f, " whoson");
832 fprintf(f, "Authenticators:");
834 fprintf(f, " cram_md5");
836 #ifdef AUTH_CYRUS_SASL
837 fprintf(f, " cyrus_sasl");
840 fprintf(f, " dovecot");
842 #ifdef AUTH_PLAINTEXT
843 fprintf(f, " plaintext");
850 fprintf(f, "Routers:");
852 fprintf(f, " accept");
854 #ifdef ROUTER_DNSLOOKUP
855 fprintf(f, " dnslookup");
857 #ifdef ROUTER_IPLITERAL
858 fprintf(f, " ipliteral");
860 #ifdef ROUTER_IPLOOKUP
861 fprintf(f, " iplookup");
863 #ifdef ROUTER_MANUALROUTE
864 fprintf(f, " manualroute");
866 #ifdef ROUTER_QUERYPROGRAM
867 fprintf(f, " queryprogram");
869 #ifdef ROUTER_REDIRECT
870 fprintf(f, " redirect");
874 fprintf(f, "Transports:");
875 #ifdef TRANSPORT_APPENDFILE
876 fprintf(f, " appendfile");
877 #ifdef SUPPORT_MAILDIR
878 fprintf(f, "/maildir");
880 #ifdef SUPPORT_MAILSTORE
881 fprintf(f, "/mailstore");
887 #ifdef TRANSPORT_AUTOREPLY
888 fprintf(f, " autoreply");
890 #ifdef TRANSPORT_LMTP
893 #ifdef TRANSPORT_PIPE
896 #ifdef TRANSPORT_SMTP
901 if (fixed_never_users[0] > 0)
904 fprintf(f, "Fixed never_users: ");
905 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
906 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
907 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
910 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
912 /* This runtime check is to help diagnose library linkage mismatches which
913 result in segfaults and the like; as such, it's left until the end,
914 just in case. There will still be a "Configuration file is" line still to
917 tls_version_report(f);
920 /* Everything else is details which are only worth reporting when debugging.
921 Perhaps the tls_version_report should move into this too. */
926 #ifdef AUTH_CYRUS_SASL
927 auth_cyrus_sasl_version_report(f);
930 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
932 PCRE_MAJOR, PCRE_MINOR,
933 /* PRE_PRERELEASE is either defined and empty or a string.
934 * This should work: */
939 for (i = 0; i < lookup_list_count; i++)
941 if (lookup_list[i]->version_report)
942 lookup_list[i]->version_report(f);
951 /*************************************************
952 * Quote a local part *
953 *************************************************/
955 /* This function is used when a sender address or a From: or Sender: header
956 line is being created from the caller's login, or from an authenticated_id. It
957 applies appropriate quoting rules for a local part.
959 Argument: the local part
960 Returns: the local part, quoted if necessary
964 local_part_quote(uschar *lpart)
966 BOOL needs_quote = FALSE;
971 for (t = lpart; !needs_quote && *t != 0; t++)
973 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
974 (*t != '.' || t == lpart || t[1] == 0);
977 if (!needs_quote) return lpart;
980 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
984 uschar *nq = US Ustrpbrk(lpart, "\\\"");
987 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
990 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
991 yield = string_cat(yield, &size, &ptr, US"\\", 1);
992 yield = string_cat(yield, &size, &ptr, nq, 1);
996 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1004 /*************************************************
1005 * Load readline() functions *
1006 *************************************************/
1008 /* This function is called from testing executions that read data from stdin,
1009 but only when running as the calling user. Currently, only -be does this. The
1010 function loads the readline() function library and passes back the functions.
1011 On some systems, it needs the curses library, so load that too, but try without
1012 it if loading fails. All this functionality has to be requested at build time.
1015 fn_readline_ptr pointer to where to put the readline pointer
1016 fn_addhist_ptr pointer to where to put the addhistory function
1018 Returns: the dlopen handle or NULL on failure
1022 set_readline(char * (**fn_readline_ptr)(char *),
1023 char * (**fn_addhist_ptr)(char *))
1026 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1028 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1029 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1031 if (dlhandle != NULL)
1033 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1034 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1038 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1047 /*************************************************
1048 * Get a line from stdin for testing things *
1049 *************************************************/
1051 /* This function is called when running tests that can take a number of lines
1052 of input (for example, -be and -bt). It handles continuations and trailing
1053 spaces. And prompting and a blank line output on eof. If readline() is in use,
1054 the arguments are non-NULL and provide the relevant functions.
1057 fn_readline readline function or NULL
1058 fn_addhist addhist function or NULL
1060 Returns: pointer to dynamic memory, or NULL at end of file
1064 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1069 uschar *yield = NULL;
1071 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1075 uschar buffer[1024];
1079 char *readline_line = NULL;
1080 if (fn_readline != NULL)
1082 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1083 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1084 p = US readline_line;
1089 /* readline() not in use */
1092 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1096 /* Handle the line */
1098 ss = p + (int)Ustrlen(p);
1099 while (ss > p && isspace(ss[-1])) ss--;
1103 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1106 yield = string_cat(yield, &size, &ptr, p, ss - p);
1109 if (fn_readline != NULL) free(readline_line);
1112 if (ss == p || yield[ptr-1] != '\\')
1120 if (yield == NULL) printf("\n");
1126 /*************************************************
1127 * Output usage information for the program *
1128 *************************************************/
1130 /* This function is called when there are no recipients
1131 or a specific --help argument was added.
1134 progname information on what name we were called by
1136 Returns: DOES NOT RETURN
1140 exim_usage(uschar *progname)
1143 /* Handle specific program invocation varients */
1144 if (Ustrcmp(progname, US"-mailq") == 0)
1147 "mailq - list the contents of the mail queue\n\n"
1148 "For a list of options, see the Exim documentation.\n");
1152 /* Generic usage - we output this whatever happens */
1154 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1155 "not directly from a shell command line. Options and/or arguments control\n"
1156 "what it does when called. For a list of options, see the Exim documentation.\n");
1163 /*************************************************
1164 * Validate that the macros given are okay *
1165 *************************************************/
1167 /* Typically, Exim will drop privileges if macros are supplied. In some
1168 cases, we want to not do so.
1170 Arguments: none (macros is a global)
1171 Returns: true if trusted, false otherwise
1175 macros_trusted(void)
1177 #ifdef WHITELIST_D_MACROS
1179 uschar *whitelisted, *end, *p, **whites, **w;
1180 int white_count, i, n;
1182 BOOL prev_char_item, found;
1187 #ifndef WHITELIST_D_MACROS
1191 /* We only trust -D overrides for some invoking users:
1192 root, the exim run-time user, the optional config owner user.
1193 I don't know why config-owner would be needed, but since they can own the
1194 config files anyway, there's no security risk to letting them override -D. */
1195 if ( ! ((real_uid == root_uid)
1196 || (real_uid == exim_uid)
1197 #ifdef CONFIGURE_OWNER
1198 || (real_uid == config_uid)
1202 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1206 /* Get a list of macros which are whitelisted */
1207 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1208 prev_char_item = FALSE;
1210 for (p = whitelisted; *p != '\0'; ++p)
1212 if (*p == ':' || isspace(*p))
1217 prev_char_item = FALSE;
1220 if (!prev_char_item)
1221 prev_char_item = TRUE;
1228 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1229 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1234 if (i == white_count)
1236 while (*p != '\0' && p < end)
1242 /* The list of macros should be very short. Accept the N*M complexity. */
1243 for (m = macros; m != NULL; m = m->next)
1246 for (w = whites; *w; ++w)
1247 if (Ustrcmp(*w, m->name) == 0)
1254 if (m->replacement == NULL)
1256 len = Ustrlen(m->replacement);
1259 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1260 0, PCRE_EOPT, NULL, 0);
1263 if (n != PCRE_ERROR_NOMATCH)
1264 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1268 debug_printf("macros_trusted overriden to true by whitelisting\n");
1274 /*************************************************
1275 * Entry point and high-level code *
1276 *************************************************/
1278 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1279 the appropriate action. All the necessary functions are present in the one
1280 binary. I originally thought one should split it up, but it turns out that so
1281 much of the apparatus is needed in each chunk that one might as well just have
1282 it all available all the time, which then makes the coding easier as well.
1285 argc count of entries in argv
1286 argv argument strings, with argv[0] being the program name
1288 Returns: EXIT_SUCCESS if terminated successfully
1289 EXIT_FAILURE otherwise, except when a message has been sent
1290 to the sender, and -oee was given
1294 main(int argc, char **cargv)
1296 uschar **argv = USS cargv;
1297 int arg_receive_timeout = -1;
1298 int arg_smtp_receive_timeout = -1;
1299 int arg_error_handling = error_handling;
1300 int filter_sfd = -1;
1301 int filter_ufd = -1;
1304 int list_queue_option = 0;
1306 int msg_action_arg = -1;
1307 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1308 int queue_only_reason = 0;
1310 int perl_start_option = 0;
1312 int recipients_arg = argc;
1313 int sender_address_domain = 0;
1314 int test_retry_arg = -1;
1315 int test_rewrite_arg = -1;
1316 BOOL arg_queue_only = FALSE;
1317 BOOL bi_option = FALSE;
1318 BOOL checking = FALSE;
1319 BOOL count_queue = FALSE;
1320 BOOL expansion_test = FALSE;
1321 BOOL extract_recipients = FALSE;
1322 BOOL forced_delivery = FALSE;
1323 BOOL f_end_dot = FALSE;
1324 BOOL deliver_give_up = FALSE;
1325 BOOL list_queue = FALSE;
1326 BOOL list_options = FALSE;
1327 BOOL local_queue_only;
1329 BOOL one_msg_action = FALSE;
1330 BOOL queue_only_set = FALSE;
1331 BOOL receiving_message = TRUE;
1332 BOOL sender_ident_set = FALSE;
1333 BOOL session_local_queue_only;
1335 BOOL removed_privilege = FALSE;
1336 BOOL usage_wanted = FALSE;
1337 BOOL verify_address_mode = FALSE;
1338 BOOL verify_as_sender = FALSE;
1339 BOOL version_printed = FALSE;
1340 uschar *alias_arg = NULL;
1341 uschar *called_as = US"";
1342 uschar *start_queue_run_id = NULL;
1343 uschar *stop_queue_run_id = NULL;
1344 uschar *expansion_test_message = NULL;
1345 uschar *ftest_domain = NULL;
1346 uschar *ftest_localpart = NULL;
1347 uschar *ftest_prefix = NULL;
1348 uschar *ftest_suffix = NULL;
1349 uschar *malware_test_file = NULL;
1350 uschar *real_sender_address;
1351 uschar *originator_home = US"/";
1355 struct stat statbuf;
1356 pid_t passed_qr_pid = (pid_t)0;
1357 int passed_qr_pipe = -1;
1358 gid_t group_list[NGROUPS_MAX];
1360 /* Possible options for -R and -S */
1362 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1364 /* Need to define this in case we need to change the environment in order
1365 to get rid of a bogus time zone. We have to make it char rather than uschar
1366 because some OS define it in /usr/include/unistd.h. */
1368 extern char **environ;
1370 /* If the Exim user and/or group and/or the configuration file owner/group were
1371 defined by ref:name at build time, we must now find the actual uid/gid values.
1372 This is a feature to make the lives of binary distributors easier. */
1374 #ifdef EXIM_USERNAME
1375 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1379 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1383 exim_gid = pw->pw_gid;
1387 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1393 #ifdef EXIM_GROUPNAME
1394 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1396 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1402 #ifdef CONFIGURE_OWNERNAME
1403 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1405 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1406 CONFIGURE_OWNERNAME);
1411 /* We default the system_filter_user to be the Exim run-time user, as a
1412 sane non-root value. */
1413 system_filter_uid = exim_uid;
1415 #ifdef CONFIGURE_GROUPNAME
1416 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1418 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1419 CONFIGURE_GROUPNAME);
1424 /* In the Cygwin environment, some initialization needs doing. It is fudged
1425 in by means of this macro. */
1431 /* Check a field which is patched when we are running Exim within its
1432 testing harness; do a fast initial check, and then the whole thing. */
1434 running_in_test_harness =
1435 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1437 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1438 at the start of a program; however, it seems that some environments do not
1439 follow this. A "strange" locale can affect the formatting of timestamps, so we
1442 setlocale(LC_ALL, "C");
1444 /* Set up the default handler for timing using alarm(). */
1446 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1448 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1449 because store_malloc writes a log entry on failure. */
1451 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1452 if (log_buffer == NULL)
1454 fprintf(stderr, "exim: failed to get store for log buffer\n");
1458 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1459 NULL when the daemon is run and the file is closed. We have to use this
1460 indirection, because some systems don't allow writing to the variable "stderr".
1463 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1465 /* Arrange for the PCRE regex library to use our store functions. Note that
1466 the normal calls are actually macros that add additional arguments for
1467 debugging purposes so we have to assign specially constructed functions here.
1468 The default is to use store in the stacking pool, but this is overridden in the
1469 regex_must_compile() function. */
1471 pcre_malloc = function_store_get;
1472 pcre_free = function_dummy_free;
1474 /* Ensure there is a big buffer for temporary use in several places. It is put
1475 in malloc store so that it can be freed for enlargement if necessary. */
1477 big_buffer = store_malloc(big_buffer_size);
1479 /* Set up the handler for the data request signal, and set the initial
1480 descriptive text. */
1482 set_process_info("initializing");
1483 os_restarting_signal(SIGUSR1, usr1_handler);
1485 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1486 in the daemon code. For the rest of Exim's uses, we ignore it. */
1488 signal(SIGHUP, SIG_IGN);
1490 /* We don't want to die on pipe errors as the code is written to handle
1491 the write error instead. */
1493 signal(SIGPIPE, SIG_IGN);
1495 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1496 set to SIG_IGN. This causes subprocesses that complete before the parent
1497 process waits for them not to hang around, so when Exim calls wait(), nothing
1498 is there. The wait() code has been made robust against this, but let's ensure
1499 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1500 ending status. We use sigaction rather than plain signal() on those OS where
1501 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1502 problem on AIX with this.) */
1506 struct sigaction act;
1507 act.sa_handler = SIG_DFL;
1508 sigemptyset(&(act.sa_mask));
1510 sigaction(SIGCHLD, &act, NULL);
1513 signal(SIGCHLD, SIG_DFL);
1516 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1521 /* Set up the version number. Set up the leading 'E' for the external form of
1522 message ids, set the pointer to the internal form, and initialize it to
1523 indicate no message being processed. */
1526 message_id_option[0] = '-';
1527 message_id_external = message_id_option + 1;
1528 message_id_external[0] = 'E';
1529 message_id = message_id_external + 1;
1532 /* Set the umask to zero so that any files Exim creates using open() are
1533 created with the modes that it specifies. NOTE: Files created with fopen() have
1534 a problem, which was not recognized till rather late (February 2006). With this
1535 umask, such files will be world writeable. (They are all content scanning files
1536 in the spool directory, which isn't world-accessible, so this is not a
1537 disaster, but it's untidy.) I don't want to change this overall setting,
1538 however, because it will interact badly with the open() calls. Instead, there's
1539 now a function called modefopen() that fiddles with the umask while calling
1544 /* Precompile the regular expression for matching a message id. Keep this in
1545 step with the code that generates ids in the accept.c module. We need to do
1546 this here, because the -M options check their arguments for syntactic validity
1547 using mac_ismsgid, which uses this. */
1550 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1552 /* Precompile the regular expression that is used for matching an SMTP error
1553 code, possibly extended, at the start of an error message. Note that the
1554 terminating whitespace character is included. */
1557 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1560 #ifdef WHITELIST_D_MACROS
1561 /* Precompile the regular expression used to filter the content of macros
1562 given to -D for permissibility. */
1564 regex_whitelisted_macro =
1565 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1569 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1570 this seems to be a generally accepted convention, since one finds symbolic
1571 links called "mailq" in standard OS configurations. */
1573 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1574 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1577 receiving_message = FALSE;
1578 called_as = US"-mailq";
1581 /* If the program is called as "rmail" treat it as equivalent to
1582 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1583 i.e. preventing a single dot on a line from terminating the message, and
1584 returning with zero return code, even in cases of error (provided an error
1585 message has been sent). */
1587 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1588 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1591 called_as = US"-rmail";
1592 errors_sender_rc = EXIT_SUCCESS;
1595 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1596 this is a smail convention. */
1598 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1599 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1601 smtp_input = smtp_batched_input = TRUE;
1602 called_as = US"-rsmtp";
1605 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1606 this is a smail convention. */
1608 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1609 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1612 receiving_message = FALSE;
1613 called_as = US"-runq";
1616 /* If the program is called as "newaliases" treat it as equivalent to
1617 "exim -bi"; this is a sendmail convention. */
1619 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1620 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1623 receiving_message = FALSE;
1624 called_as = US"-newaliases";
1627 /* Save the original effective uid for a couple of uses later. It should
1628 normally be root, but in some esoteric environments it may not be. */
1630 original_euid = geteuid();
1632 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1633 to be the same as the real ones. This makes a difference only if Exim is setuid
1634 (or setgid) to something other than root, which could be the case in some
1635 special configurations. */
1637 real_uid = getuid();
1638 real_gid = getgid();
1640 if (real_uid == root_uid)
1646 /* If neither the original real uid nor the original euid was root, Exim is
1647 running in an unprivileged state. */
1649 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1651 /* Scan the program's arguments. Some can be dealt with right away; others are
1652 simply recorded for checking and handling afterwards. Do a high-level switch
1653 on the second character (the one after '-'), to save some effort. */
1655 for (i = 1; i < argc; i++)
1657 BOOL badarg = FALSE;
1658 uschar *arg = argv[i];
1662 /* An argument not starting with '-' is the start of a recipients list;
1663 break out of the options-scanning loop. */
1671 /* An option consistion of -- terminates the options */
1673 if (Ustrcmp(arg, "--") == 0)
1675 recipients_arg = i + 1;
1679 /* Handle flagged options */
1681 switchchar = arg[1];
1684 /* Make all -ex options synonymous with -oex arguments, since that
1685 is assumed by various callers. Also make -qR options synonymous with -R
1686 options, as that seems to be required as well. Allow for -qqR too, and
1687 the same for -S options. */
1689 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1690 Ustrncmp(arg+1, "qR", 2) == 0 ||
1691 Ustrncmp(arg+1, "qS", 2) == 0)
1693 switchchar = arg[2];
1696 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1698 switchchar = arg[3];
1700 queue_2stage = TRUE;
1703 /* Make -r synonymous with -f, since it is a documented alias */
1705 else if (arg[1] == 'r') switchchar = 'f';
1707 /* Make -ov synonymous with -v */
1709 else if (Ustrcmp(arg, "-ov") == 0)
1715 /* deal with --option_aliases */
1716 else if (switchchar == '-')
1718 if (Ustrcmp(argrest, "help") == 0)
1720 usage_wanted = TRUE;
1723 else if (Ustrcmp(argrest, "version") == 0)
1730 /* High-level switch on active initial letter */
1734 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1735 so has no need of it. */
1738 if (*argrest == 0) i++; /* Skip over the type */
1743 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1745 /* -bd: Run in daemon mode, awaiting SMTP connections.
1746 -bdf: Ditto, but in the foreground.
1749 if (*argrest == 'd')
1751 daemon_listen = TRUE;
1752 if (*(++argrest) == 'f') background_daemon = FALSE;
1753 else if (*argrest != 0) { badarg = TRUE; break; }
1756 /* -be: Run in expansion test mode
1757 -bem: Ditto, but read a message from a file first
1760 else if (*argrest == 'e')
1762 expansion_test = checking = TRUE;
1763 if (argrest[1] == 'm')
1765 if (++i >= argc) { badarg = TRUE; break; }
1766 expansion_test_message = argv[i];
1769 if (argrest[1] != 0) { badarg = TRUE; break; }
1772 /* -bF: Run system filter test */
1774 else if (*argrest == 'F')
1776 filter_test |= FTEST_SYSTEM;
1777 if (*(++argrest) != 0) { badarg = TRUE; break; }
1778 if (++i < argc) filter_test_sfile = argv[i]; else
1780 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1785 /* -bf: Run user filter test
1786 -bfd: Set domain for filter testing
1787 -bfl: Set local part for filter testing
1788 -bfp: Set prefix for filter testing
1789 -bfs: Set suffix for filter testing
1792 else if (*argrest == 'f')
1794 if (*(++argrest) == 0)
1796 filter_test |= FTEST_USER;
1797 if (++i < argc) filter_test_ufile = argv[i]; else
1799 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1807 fprintf(stderr, "exim: string expected after %s\n", arg);
1810 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1811 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1812 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1813 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1814 else { badarg = TRUE; break; }
1818 /* -bh: Host checking - an IP address must follow. */
1820 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1822 if (++i >= argc) { badarg = TRUE; break; }
1823 sender_host_address = argv[i];
1824 host_checking = checking = log_testing_mode = TRUE;
1825 host_checking_callout = argrest[1] == 'c';
1828 /* -bi: This option is used by sendmail to initialize *the* alias file,
1829 though it has the -oA option to specify a different file. Exim has no
1830 concept of *the* alias file, but since Sun's YP make script calls
1831 sendmail this way, some support must be provided. */
1833 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1835 /* -bm: Accept and deliver message - the default option. Reinstate
1836 receiving_message, which got turned off for all -b options. */
1838 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1840 /* -bmalware: test the filename given for malware */
1842 else if (Ustrcmp(argrest, "malware") == 0)
1844 if (++i >= argc) { badarg = TRUE; break; }
1845 malware_test_file = argv[i];
1848 /* -bnq: For locally originating messages, do not qualify unqualified
1849 addresses. In the envelope, this causes errors; in header lines they
1852 else if (Ustrcmp(argrest, "nq") == 0)
1854 allow_unqualified_sender = FALSE;
1855 allow_unqualified_recipient = FALSE;
1858 /* -bpxx: List the contents of the mail queue, in various forms. If
1859 the option is -bpc, just a queue count is needed. Otherwise, if the
1860 first letter after p is r, then order is random. */
1862 else if (*argrest == 'p')
1864 if (*(++argrest) == 'c')
1867 if (*(++argrest) != 0) badarg = TRUE;
1871 if (*argrest == 'r')
1873 list_queue_option = 8;
1876 else list_queue_option = 0;
1880 /* -bp: List the contents of the mail queue, top-level only */
1882 if (*argrest == 0) {}
1884 /* -bpu: List the contents of the mail queue, top-level undelivered */
1886 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1888 /* -bpa: List the contents of the mail queue, including all delivered */
1890 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1892 /* Unknown after -bp[r] */
1902 /* -bP: List the configuration variables given as the address list.
1903 Force -v, so configuration errors get displayed. */
1905 else if (Ustrcmp(argrest, "P") == 0)
1907 list_options = TRUE;
1908 debug_selector |= D_v;
1909 debug_file = stderr;
1912 /* -brt: Test retry configuration lookup */
1914 else if (Ustrcmp(argrest, "rt") == 0)
1916 test_retry_arg = i + 1;
1920 /* -brw: Test rewrite configuration */
1922 else if (Ustrcmp(argrest, "rw") == 0)
1924 test_rewrite_arg = i + 1;
1928 /* -bS: Read SMTP commands on standard input, but produce no replies -
1929 all errors are reported by sending messages. */
1931 else if (Ustrcmp(argrest, "S") == 0)
1932 smtp_input = smtp_batched_input = receiving_message = TRUE;
1934 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1935 on standard output. */
1937 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1939 /* -bt: address testing mode */
1941 else if (Ustrcmp(argrest, "t") == 0)
1942 address_test_mode = checking = log_testing_mode = TRUE;
1944 /* -bv: verify addresses */
1946 else if (Ustrcmp(argrest, "v") == 0)
1947 verify_address_mode = checking = log_testing_mode = TRUE;
1949 /* -bvs: verify sender addresses */
1951 else if (Ustrcmp(argrest, "vs") == 0)
1953 verify_address_mode = checking = log_testing_mode = TRUE;
1954 verify_as_sender = TRUE;
1957 /* -bV: Print version string and support details */
1959 else if (Ustrcmp(argrest, "V") == 0)
1961 printf("Exim version %s #%s built %s\n", version_string,
1962 version_cnumber, version_date);
1963 printf("%s\n", CS version_copyright);
1964 version_printed = TRUE;
1965 show_whats_supported(stdout);
1972 /* -C: change configuration file list; ignore if it isn't really
1973 a change! Enforce a prefix check if required. */
1978 if(++i < argc) argrest = argv[i]; else
1979 { badarg = TRUE; break; }
1981 if (Ustrcmp(config_main_filelist, argrest) != 0)
1983 #ifdef ALT_CONFIG_PREFIX
1985 int len = Ustrlen(ALT_CONFIG_PREFIX);
1986 uschar *list = argrest;
1988 while((filename = string_nextinlist(&list, &sep, big_buffer,
1989 big_buffer_size)) != NULL)
1991 if ((Ustrlen(filename) < len ||
1992 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1993 Ustrstr(filename, "/../") != NULL) &&
1994 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1996 fprintf(stderr, "-C Permission denied\n");
2001 if (real_uid != root_uid)
2003 #ifdef TRUSTED_CONFIG_LIST
2005 if (real_uid != exim_uid
2006 #ifdef CONFIGURE_OWNER
2007 && real_uid != config_uid
2010 trusted_config = FALSE;
2013 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2016 struct stat statbuf;
2018 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2019 (statbuf.st_uid != root_uid /* owner not root */
2020 #ifdef CONFIGURE_OWNER
2021 && statbuf.st_uid != config_uid /* owner not the special one */
2024 (statbuf.st_gid != root_gid /* group not root */
2025 #ifdef CONFIGURE_GROUP
2026 && statbuf.st_gid != config_gid /* group not the special one */
2028 && (statbuf.st_mode & 020) != 0 /* group writeable */
2030 (statbuf.st_mode & 2) != 0) /* world writeable */
2032 trusted_config = FALSE;
2037 /* Well, the trust list at least is up to scratch... */
2038 void *reset_point = store_get(0);
2039 uschar *trusted_configs[32];
2043 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2045 uschar *start = big_buffer, *nl;
2046 while (*start && isspace(*start))
2050 nl = Ustrchr(start, '\n');
2053 trusted_configs[nr_configs++] = string_copy(start);
2054 if (nr_configs == 32)
2062 uschar *list = argrest;
2064 while (trusted_config && (filename = string_nextinlist(&list,
2065 &sep, big_buffer, big_buffer_size)) != NULL)
2067 for (i=0; i < nr_configs; i++)
2069 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2072 if (i == nr_configs)
2074 trusted_config = FALSE;
2078 store_reset(reset_point);
2082 /* No valid prefixes found in trust_list file. */
2083 trusted_config = FALSE;
2089 /* Could not open trust_list file. */
2090 trusted_config = FALSE;
2094 /* Not root; don't trust config */
2095 trusted_config = FALSE;
2099 config_main_filelist = argrest;
2100 config_changed = TRUE;
2105 /* -D: set up a macro definition */
2108 #ifdef DISABLE_D_OPTION
2109 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2114 macro_item *mlast = NULL;
2117 uschar *s = argrest;
2119 while (isspace(*s)) s++;
2121 if (*s < 'A' || *s > 'Z')
2123 fprintf(stderr, "exim: macro name set by -D must start with "
2124 "an upper case letter\n");
2128 while (isalnum(*s) || *s == '_')
2130 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2134 if (ptr == 0) { badarg = TRUE; break; }
2135 while (isspace(*s)) s++;
2138 if (*s++ != '=') { badarg = TRUE; break; }
2139 while (isspace(*s)) s++;
2142 for (m = macros; m != NULL; m = m->next)
2144 if (Ustrcmp(m->name, name) == 0)
2146 fprintf(stderr, "exim: duplicated -D in command line\n");
2152 m = store_get(sizeof(macro_item) + Ustrlen(name));
2154 m->command_line = TRUE;
2155 if (mlast == NULL) macros = m; else mlast->next = m;
2156 Ustrcpy(m->name, name);
2157 m->replacement = string_copy(s);
2159 if (clmacro_count >= MAX_CLMACROS)
2161 fprintf(stderr, "exim: too many -D options on command line\n");
2164 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2170 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2171 The latter is now a no-op, retained for compatibility only. If -dd is used,
2172 debugging subprocesses of the daemon is disabled. */
2175 if (Ustrcmp(argrest, "ropcr") == 0)
2177 /* drop_cr = TRUE; */
2180 /* Use an intermediate variable so that we don't set debugging while
2181 decoding the debugging bits. */
2185 unsigned int selector = D_default;
2188 if (*argrest == 'd')
2190 debug_daemon = TRUE;
2194 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2195 debug_options_count, US"debug", 0);
2196 debug_selector = selector;
2201 /* -E: This is a local error message. This option is not intended for
2202 external use at all, but is not restricted to trusted callers because it
2203 does no harm (just suppresses certain error messages) and if Exim is run
2204 not setuid root it won't always be trusted when it generates error
2205 messages using this option. If there is a message id following -E, point
2206 message_reference at it, for logging. */
2209 local_error_message = TRUE;
2210 if (mac_ismsgid(argrest)) message_reference = argrest;
2214 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2215 option, so it looks as if historically the -oex options are also callable
2216 without the leading -o. So we have to accept them. Before the switch,
2217 anything starting -oe has been converted to -e. Exim does not support all
2218 of the sendmail error options. */
2221 if (Ustrcmp(argrest, "e") == 0)
2223 arg_error_handling = ERRORS_SENDER;
2224 errors_sender_rc = EXIT_SUCCESS;
2226 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2227 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2228 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2229 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2234 /* -F: Set sender's full name, used instead of the gecos entry from
2235 the password file. Since users can usually alter their gecos entries,
2236 there's no security involved in using this instead. The data can follow
2237 the -F or be in the next argument. */
2242 if(++i < argc) argrest = argv[i]; else
2243 { badarg = TRUE; break; }
2245 originator_name = argrest;
2246 sender_name_forced = TRUE;
2250 /* -f: Set sender's address - this value is only actually used if Exim is
2251 run by a trusted user, or if untrusted_set_sender is set and matches the
2252 address, except that the null address can always be set by any user. The
2253 test for this happens later, when the value given here is ignored when not
2254 permitted. For an untrusted user, the actual sender is still put in Sender:
2255 if it doesn't match the From: header (unless no_local_from_check is set).
2256 The data can follow the -f or be in the next argument. The -r switch is an
2257 obsolete form of -f but since there appear to be programs out there that
2258 use anything that sendmail has ever supported, better accept it - the
2259 synonymizing is done before the switch above.
2261 At this stage, we must allow domain literal addresses, because we don't
2262 know what the setting of allow_domain_literals is yet. Ditto for trailing
2263 dots and strip_trailing_dot. */
2271 if (i+1 < argc) argrest = argv[++i]; else
2272 { badarg = TRUE; break; }
2276 sender_address = string_sprintf(""); /* Ensure writeable memory */
2280 uschar *temp = argrest + Ustrlen(argrest) - 1;
2281 while (temp >= argrest && isspace(*temp)) temp--;
2282 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2283 allow_domain_literals = TRUE;
2284 strip_trailing_dot = TRUE;
2285 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2286 &sender_address_domain, TRUE);
2287 allow_domain_literals = FALSE;
2288 strip_trailing_dot = FALSE;
2289 if (sender_address == NULL)
2291 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2292 return EXIT_FAILURE;
2295 sender_address_forced = TRUE;
2299 /* This is some Sendmail thing which can be ignored */
2304 /* -h: Set the hop count for an incoming message. Exim does not currently
2305 support this; it always computes it by counting the Received: headers.
2306 To put it in will require a change to the spool header file format. */
2311 if(++i < argc) argrest = argv[i]; else
2312 { badarg = TRUE; break; }
2314 if (!isdigit(*argrest)) badarg = TRUE;
2318 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2319 not to be documented for sendmail but mailx (at least) uses it) */
2322 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2327 receiving_message = FALSE;
2329 /* -MC: continue delivery of another message via an existing open
2330 file descriptor. This option is used for an internal call by the
2331 smtp transport when there is a pending message waiting to go to an
2332 address to which it has got a connection. Five subsequent arguments are
2333 required: transport name, host name, IP address, sequence number, and
2334 message_id. Transports may decline to create new processes if the sequence
2335 number gets too big. The channel is stdin. This (-MC) must be the last
2336 argument. There's a subsequent check that the real-uid is privileged.
2338 If we are running in the test harness. delay for a bit, to let the process
2339 that set this one up complete. This makes for repeatability of the logging,
2342 if (Ustrcmp(argrest, "C") == 0)
2344 union sockaddr_46 interface_sock;
2345 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2349 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2350 return EXIT_FAILURE;
2353 if (msg_action_arg >= 0)
2355 fprintf(stderr, "exim: incompatible arguments\n");
2356 return EXIT_FAILURE;
2359 continue_transport = argv[++i];
2360 continue_hostname = argv[++i];
2361 continue_host_address = argv[++i];
2362 continue_sequence = Uatoi(argv[++i]);
2363 msg_action = MSG_DELIVER;
2364 msg_action_arg = ++i;
2365 forced_delivery = TRUE;
2366 queue_run_pid = passed_qr_pid;
2367 queue_run_pipe = passed_qr_pipe;
2369 if (!mac_ismsgid(argv[i]))
2371 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2373 return EXIT_FAILURE;
2376 /* Set up $sending_ip_address and $sending_port */
2378 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2380 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2384 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2386 return EXIT_FAILURE;
2389 if (running_in_test_harness) millisleep(500);
2393 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2394 precedes -MC (see above). The flag indicates that the host to which
2395 Exim is connected has accepted an AUTH sequence. */
2397 else if (Ustrcmp(argrest, "CA") == 0)
2399 smtp_authenticated = TRUE;
2403 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2404 it preceded -MC (see above) */
2406 else if (Ustrcmp(argrest, "CP") == 0)
2408 smtp_use_pipelining = TRUE;
2412 /* -MCQ: pass on the pid of the queue-running process that started
2413 this chain of deliveries and the fd of its synchronizing pipe; this
2414 is useful only when it precedes -MC (see above) */
2416 else if (Ustrcmp(argrest, "CQ") == 0)
2418 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2420 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2425 /* -MCS: set the smtp_use_size flag; this is useful only when it
2426 precedes -MC (see above) */
2428 else if (Ustrcmp(argrest, "CS") == 0)
2430 smtp_use_size = TRUE;
2434 /* -MCT: set the tls_offered flag; this is useful only when it
2435 precedes -MC (see above). The flag indicates that the host to which
2436 Exim is connected has offered TLS support. */
2439 else if (Ustrcmp(argrest, "CT") == 0)
2446 /* -M[x]: various operations on the following list of message ids:
2447 -M deliver the messages, ignoring next retry times and thawing
2448 -Mc deliver the messages, checking next retry times, no thawing
2449 -Mf freeze the messages
2450 -Mg give up on the messages
2451 -Mt thaw the messages
2452 -Mrm remove the messages
2453 In the above cases, this must be the last option. There are also the
2454 following options which are followed by a single message id, and which
2455 act on that message. Some of them use the "recipient" addresses as well.
2456 -Mar add recipient(s)
2457 -Mmad mark all recipients delivered
2458 -Mmd mark recipients(s) delivered
2460 -Mset load a message for use with -be
2462 -Mvc show copy (of whole message, in RFC 2822 format)
2467 else if (*argrest == 0)
2469 msg_action = MSG_DELIVER;
2470 forced_delivery = deliver_force_thaw = TRUE;
2472 else if (Ustrcmp(argrest, "ar") == 0)
2474 msg_action = MSG_ADD_RECIPIENT;
2475 one_msg_action = TRUE;
2477 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2478 else if (Ustrcmp(argrest, "es") == 0)
2480 msg_action = MSG_EDIT_SENDER;
2481 one_msg_action = TRUE;
2483 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2484 else if (Ustrcmp(argrest, "g") == 0)
2486 msg_action = MSG_DELIVER;
2487 deliver_give_up = TRUE;
2489 else if (Ustrcmp(argrest, "mad") == 0)
2491 msg_action = MSG_MARK_ALL_DELIVERED;
2493 else if (Ustrcmp(argrest, "md") == 0)
2495 msg_action = MSG_MARK_DELIVERED;
2496 one_msg_action = TRUE;
2498 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2499 else if (Ustrcmp(argrest, "set") == 0)
2501 msg_action = MSG_LOAD;
2502 one_msg_action = TRUE;
2504 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2505 else if (Ustrcmp(argrest, "vb") == 0)
2507 msg_action = MSG_SHOW_BODY;
2508 one_msg_action = TRUE;
2510 else if (Ustrcmp(argrest, "vc") == 0)
2512 msg_action = MSG_SHOW_COPY;
2513 one_msg_action = TRUE;
2515 else if (Ustrcmp(argrest, "vh") == 0)
2517 msg_action = MSG_SHOW_HEADER;
2518 one_msg_action = TRUE;
2520 else if (Ustrcmp(argrest, "vl") == 0)
2522 msg_action = MSG_SHOW_LOG;
2523 one_msg_action = TRUE;
2525 else { badarg = TRUE; break; }
2527 /* All the -Mxx options require at least one message id. */
2529 msg_action_arg = i + 1;
2530 if (msg_action_arg >= argc)
2532 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2533 return EXIT_FAILURE;
2536 /* Some require only message ids to follow */
2538 if (!one_msg_action)
2541 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2543 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2545 return EXIT_FAILURE;
2547 goto END_ARG; /* Remaining args are ids */
2550 /* Others require only one message id, possibly followed by addresses,
2551 which will be handled as normal arguments. */
2555 if (!mac_ismsgid(argv[msg_action_arg]))
2557 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2558 argv[msg_action_arg], arg);
2559 return EXIT_FAILURE;
2566 /* Some programs seem to call the -om option without the leading o;
2567 for sendmail it askes for "me too". Exim always does this. */
2570 if (*argrest != 0) badarg = TRUE;
2574 /* -N: don't do delivery - a debugging option that stops transports doing
2575 their thing. It implies debugging at the D_v level. */
2580 dont_deliver = TRUE;
2581 debug_selector |= D_v;
2582 debug_file = stderr;
2588 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2594 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2595 option to the specified value. This form uses long names. We need to handle
2596 -O option=value and -Ooption=value. */
2603 fprintf(stderr, "exim: string expected after -O\n");
2611 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2614 if (*argrest == 'A')
2616 alias_arg = argrest + 1;
2617 if (alias_arg[0] == 0)
2619 if (i+1 < argc) alias_arg = argv[++i]; else
2621 fprintf(stderr, "exim: string expected after -oA\n");
2627 /* -oB: Set a connection message max value for remote deliveries */
2629 else if (*argrest == 'B')
2631 uschar *p = argrest + 1;
2634 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2636 connection_max_messages = 1;
2645 fprintf(stderr, "exim: number expected after -oB\n");
2648 connection_max_messages = Uatoi(p);
2652 /* -odb: background delivery */
2654 else if (Ustrcmp(argrest, "db") == 0)
2656 synchronous_delivery = FALSE;
2657 arg_queue_only = FALSE;
2658 queue_only_set = TRUE;
2661 /* -odf: foreground delivery (smail-compatible option); same effect as
2662 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2665 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2667 synchronous_delivery = TRUE;
2668 arg_queue_only = FALSE;
2669 queue_only_set = TRUE;
2672 /* -odq: queue only */
2674 else if (Ustrcmp(argrest, "dq") == 0)
2676 synchronous_delivery = FALSE;
2677 arg_queue_only = TRUE;
2678 queue_only_set = TRUE;
2681 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2682 but no remote delivery */
2684 else if (Ustrcmp(argrest, "dqs") == 0)
2687 arg_queue_only = FALSE;
2688 queue_only_set = TRUE;
2691 /* -oex: Sendmail error flags. As these are also accepted without the
2692 leading -o prefix, for compatibility with vacation and other callers,
2693 they are handled with -e above. */
2695 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2696 -oitrue: Another sendmail syntax for the same */
2698 else if (Ustrcmp(argrest, "i") == 0 ||
2699 Ustrcmp(argrest, "itrue") == 0)
2702 /* -oM*: Set various characteristics for an incoming message; actually
2703 acted on for trusted callers only. */
2705 else if (*argrest == 'M')
2709 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2713 /* -oMa: Set sender host address */
2715 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2717 /* -oMaa: Set authenticator name */
2719 else if (Ustrcmp(argrest, "Maa") == 0)
2720 sender_host_authenticated = argv[++i];
2722 /* -oMas: setting authenticated sender */
2724 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2726 /* -oMai: setting authenticated id */
2728 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2730 /* -oMi: Set incoming interface address */
2732 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2734 /* -oMr: Received protocol */
2736 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2738 /* -oMs: Set sender host name */
2740 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2742 /* -oMt: Set sender ident */
2744 else if (Ustrcmp(argrest, "Mt") == 0)
2746 sender_ident_set = TRUE;
2747 sender_ident = argv[++i];
2750 /* Else a bad argument */
2759 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2760 seem to call this as -m (undocumented), so that is also accepted (see
2763 else if (Ustrcmp(argrest, "m") == 0) {}
2765 /* -oo: An ancient flag for old-style addresses which still seems to
2766 crop up in some calls (see in SCO). */
2768 else if (Ustrcmp(argrest, "o") == 0) {}
2770 /* -oP <name>: set pid file path for daemon */
2772 else if (Ustrcmp(argrest, "P") == 0)
2773 override_pid_file_path = argv[++i];
2775 /* -or <n>: set timeout for non-SMTP acceptance
2776 -os <n>: set timeout for SMTP acceptance */
2778 else if (*argrest == 'r' || *argrest == 's')
2780 int *tp = (*argrest == 'r')?
2781 &arg_receive_timeout : &arg_smtp_receive_timeout;
2782 if (argrest[1] == 0)
2784 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2786 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2789 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2794 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2796 else if (Ustrcmp(argrest, "X") == 0)
2797 override_local_interfaces = argv[++i];
2799 /* Unknown -o argument */
2805 /* -ps: force Perl startup; -pd force delayed Perl startup */
2809 if (*argrest == 's' && argrest[1] == 0)
2811 perl_start_option = 1;
2814 if (*argrest == 'd' && argrest[1] == 0)
2816 perl_start_option = -1;
2821 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2822 which sets the host protocol and host name */
2826 if (i+1 < argc) argrest = argv[++i]; else
2827 { badarg = TRUE; break; }
2832 uschar *hn = Ustrchr(argrest, ':');
2835 received_protocol = argrest;
2839 received_protocol = string_copyn(argrest, hn - argrest);
2840 sender_host_name = hn + 1;
2847 receiving_message = FALSE;
2848 if (queue_interval >= 0)
2850 fprintf(stderr, "exim: -q specified more than once\n");
2854 /* -qq...: Do queue runs in a 2-stage manner */
2856 if (*argrest == 'q')
2858 queue_2stage = TRUE;
2862 /* -qi...: Do only first (initial) deliveries */
2864 if (*argrest == 'i')
2866 queue_run_first_delivery = TRUE;
2870 /* -qf...: Run the queue, forcing deliveries
2871 -qff..: Ditto, forcing thawing as well */
2873 if (*argrest == 'f')
2875 queue_run_force = TRUE;
2876 if (*(++argrest) == 'f')
2878 deliver_force_thaw = TRUE;
2883 /* -q[f][f]l...: Run the queue only on local deliveries */
2885 if (*argrest == 'l')
2887 queue_run_local = TRUE;
2891 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2892 optionally starting from a given message id. */
2894 if (*argrest == 0 &&
2895 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2898 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2899 start_queue_run_id = argv[++i];
2900 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2901 stop_queue_run_id = argv[++i];
2904 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2905 optionally local only. */
2910 queue_interval = readconf_readtime(argrest, 0, FALSE);
2912 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2913 if (queue_interval <= 0)
2915 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2922 case 'R': /* Synonymous with -qR... */
2923 receiving_message = FALSE;
2925 /* -Rf: As -R (below) but force all deliveries,
2926 -Rff: Ditto, but also thaw all frozen messages,
2927 -Rr: String is regex
2928 -Rrf: Regex and force
2929 -Rrff: Regex and force and thaw
2931 in all cases provided there are no further characters in this
2937 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2939 if (Ustrcmp(argrest, rsopts[i]) == 0)
2941 if (i != 2) queue_run_force = TRUE;
2942 if (i >= 2) deliver_selectstring_regex = TRUE;
2943 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2944 argrest += Ustrlen(rsopts[i]);
2949 /* -R: Set string to match in addresses for forced queue run to
2950 pick out particular messages. */
2954 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2956 fprintf(stderr, "exim: string expected after -R\n");
2960 else deliver_selectstring = argrest;
2964 /* -r: an obsolete synonym for -f (see above) */
2967 /* -S: Like -R but works on sender. */
2969 case 'S': /* Synonymous with -qS... */
2970 receiving_message = FALSE;
2972 /* -Sf: As -S (below) but force all deliveries,
2973 -Sff: Ditto, but also thaw all frozen messages,
2974 -Sr: String is regex
2975 -Srf: Regex and force
2976 -Srff: Regex and force and thaw
2978 in all cases provided there are no further characters in this
2984 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2986 if (Ustrcmp(argrest, rsopts[i]) == 0)
2988 if (i != 2) queue_run_force = TRUE;
2989 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2990 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2991 argrest += Ustrlen(rsopts[i]);
2996 /* -S: Set string to match in addresses for forced queue run to
2997 pick out particular messages. */
3001 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3003 fprintf(stderr, "exim: string expected after -S\n");
3007 else deliver_selectstring_sender = argrest;
3010 /* -Tqt is an option that is exclusively for use by the testing suite.
3011 It is not recognized in other circumstances. It allows for the setting up
3012 of explicit "queue times" so that various warning/retry things can be
3013 tested. Otherwise variability of clock ticks etc. cause problems. */
3016 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3017 fudged_queue_times = argv[++i];
3022 /* -t: Set flag to extract recipients from body of message. */
3025 if (*argrest == 0) extract_recipients = TRUE;
3027 /* -ti: Set flag to extract recipients from body of message, and also
3028 specify that dot does not end the message. */
3030 else if (Ustrcmp(argrest, "i") == 0)
3032 extract_recipients = TRUE;
3036 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3039 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3046 /* -U: This means "initial user submission" in sendmail, apparently. The
3047 doc claims that in future sendmail may refuse syntactically invalid
3048 messages instead of fixing them. For the moment, we just ignore it. */
3054 /* -v: verify things - this is a very low-level debugging */
3059 debug_selector |= D_v;
3060 debug_file = stderr;
3066 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3068 The -x flag tells the sendmail command that mail from a local
3069 mail program has National Language Support (NLS) extended characters
3070 in the body of the mail item. The sendmail command can send mail with
3071 extended NLS characters across networks that normally corrupts these
3074 As Exim is 8-bit clean, it just ignores this flag. */
3077 if (*argrest != 0) badarg = TRUE;
3080 /* All other initial characters are errors */
3085 } /* End of high-level switch statement */
3087 /* Failed to recognize the option, or syntax error */
3091 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3092 "option %s\n", arg);
3098 /* If -R or -S have been specified without -q, assume a single queue run. */
3100 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3101 queue_interval < 0) queue_interval = 0;
3105 /* If usage_wanted is set we call the usage function - which never returns */
3106 if (usage_wanted) exim_usage(called_as);
3108 /* Arguments have been processed. Check for incompatibilities. */
3110 (smtp_input || extract_recipients || recipients_arg < argc) &&
3111 (daemon_listen || queue_interval >= 0 || bi_option ||
3112 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3113 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3116 msg_action_arg > 0 &&
3117 (daemon_listen || queue_interval >= 0 || list_options ||
3118 (checking && msg_action != MSG_LOAD) ||
3119 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3122 (daemon_listen || queue_interval >= 0) &&
3123 (sender_address != NULL || list_options || list_queue || checking ||
3127 daemon_listen && queue_interval == 0
3131 (checking || smtp_input || extract_recipients ||
3132 filter_test != FTEST_NONE || bi_option)
3135 verify_address_mode &&
3136 (address_test_mode || smtp_input || extract_recipients ||
3137 filter_test != FTEST_NONE || bi_option)
3140 address_test_mode && (smtp_input || extract_recipients ||
3141 filter_test != FTEST_NONE || bi_option)
3144 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3148 deliver_selectstring != NULL && queue_interval < 0
3151 msg_action == MSG_LOAD &&
3152 (!expansion_test || expansion_test_message != NULL)
3156 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3160 /* If debugging is set up, set the file and the file descriptor to pass on to
3161 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3162 to run in the foreground. */
3164 if (debug_selector != 0)
3166 debug_file = stderr;
3167 debug_fd = fileno(debug_file);
3168 background_daemon = FALSE;
3169 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3170 if (debug_selector != D_v) /* -v only doesn't show this */
3172 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3173 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3175 if (!version_printed)
3176 show_whats_supported(stderr);
3180 /* When started with root privilege, ensure that the limits on the number of
3181 open files and the number of processes (where that is accessible) are
3182 sufficiently large, or are unset, in case Exim has been called from an
3183 environment where the limits are screwed down. Not all OS have the ability to
3184 change some of these limits. */
3188 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3194 #ifdef RLIMIT_NOFILE
3195 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3197 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3199 rlp.rlim_cur = rlp.rlim_max = 0;
3202 /* I originally chose 1000 as a nice big number that was unlikely to
3203 be exceeded. It turns out that some older OS have a fixed upper limit of
3206 if (rlp.rlim_cur < 1000)
3208 rlp.rlim_cur = rlp.rlim_max = 1000;
3209 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3211 rlp.rlim_cur = rlp.rlim_max = 256;
3212 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3213 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3220 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3222 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3224 rlp.rlim_cur = rlp.rlim_max = 0;
3227 #ifdef RLIM_INFINITY
3228 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3230 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3232 if (rlp.rlim_cur < 1000)
3234 rlp.rlim_cur = rlp.rlim_max = 1000;
3236 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3237 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3243 /* Exim is normally entered as root (but some special configurations are
3244 possible that don't do this). However, it always spins off sub-processes that
3245 set their uid and gid as required for local delivery. We don't want to pass on
3246 any extra groups that root may belong to, so we want to get rid of them all at
3249 We need to obey setgroups() at this stage, before possibly giving up root
3250 privilege for a changed configuration file, but later on we might need to
3251 check on the additional groups for the admin user privilege - can't do that
3252 till after reading the config, which might specify the exim gid. Therefore,
3253 save the group list here first. */
3255 group_count = getgroups(NGROUPS_MAX, group_list);
3257 /* There is a fundamental difference in some BSD systems in the matter of
3258 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3259 known not to be different. On the "different" systems there is a single group
3260 list, and the first entry in it is the current group. On all other versions of
3261 Unix there is a supplementary group list, which is in *addition* to the current
3262 group. Consequently, to get rid of all extraneous groups on a "standard" system
3263 you pass over 0 groups to setgroups(), while on a "different" system you pass
3264 over a single group - the current group, which is always the first group in the
3265 list. Calling setgroups() with zero groups on a "different" system results in
3266 an error return. The following code should cope with both types of system.
3268 However, if this process isn't running as root, setgroups() can't be used
3269 since you have to be root to run it, even if throwing away groups. Not being
3270 root here happens only in some unusual configurations. We just ignore the
3273 if (setgroups(0, NULL) != 0)
3275 if (setgroups(1, group_list) != 0 && !unprivileged)
3277 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3282 /* If the configuration file name has been altered by an argument on the
3283 command line (either a new file name or a macro definition) and the caller is
3284 not root, or if this is a filter testing run, remove any setuid privilege the
3285 program has and run as the underlying user.
3287 The exim user is locked out of this, which severely restricts the use of -C
3290 Otherwise, set the real ids to the effective values (should be root unless run
3291 from inetd, which it can either be root or the exim uid, if one is configured).
3293 There is a private mechanism for bypassing some of this, in order to make it
3294 possible to test lots of configurations automatically, without having either to
3295 recompile each time, or to patch in an actual configuration file name and other
3296 values (such as the path name). If running in the test harness, pretend that
3297 configuration file changes and macro definitions haven't happened. */
3300 (!trusted_config || /* Config changed, or */
3301 !macros_trusted()) && /* impermissible macros and */
3302 real_uid != root_uid && /* Not root, and */
3303 !running_in_test_harness /* Not fudged */
3305 expansion_test /* expansion testing */
3307 filter_test != FTEST_NONE) /* Filter testing */
3309 setgroups(group_count, group_list);
3310 exim_setugid(real_uid, real_gid, FALSE,
3311 US"-C, -D, -be or -bf forces real uid");
3312 removed_privilege = TRUE;
3314 /* In the normal case when Exim is called like this, stderr is available
3315 and should be used for any logging information because attempts to write
3316 to the log will usually fail. To arrange this, we unset really_exim. However,
3317 if no stderr is available there is no point - we might as well have a go
3318 at the log (if it fails, syslog will be written). */
3320 if (log_stderr != NULL) really_exim = FALSE;
3323 /* Privilege is to be retained for the moment. It may be dropped later,
3324 depending on the job that this Exim process has been asked to do. For now, set
3325 the real uid to the effective so that subsequent re-execs of Exim are done by a
3328 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3330 /* If testing a filter, open the file(s) now, before wasting time doing other
3331 setups and reading the message. */
3333 if ((filter_test & FTEST_SYSTEM) != 0)
3335 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3338 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3340 return EXIT_FAILURE;
3344 if ((filter_test & FTEST_USER) != 0)
3346 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3349 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3351 return EXIT_FAILURE;
3355 /* Read the main runtime configuration data; this gives up if there
3356 is a failure. It leaves the configuration file open so that the subsequent
3357 configuration data for delivery can be read if needed. */
3361 /* Handle the decoding of logging options. */
3363 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3364 log_selector_string, log_options, log_options_count, US"log", 0);
3368 debug_printf("configuration file is %s\n", config_main_filename);
3369 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3370 log_extra_selector);
3373 /* If domain literals are not allowed, check the sender address that was
3374 supplied with -f. Ditto for a stripped trailing dot. */
3376 if (sender_address != NULL)
3378 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3380 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3381 "allowed\n", sender_address);
3382 return EXIT_FAILURE;
3384 if (f_end_dot && !strip_trailing_dot)
3386 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3387 "(trailing dot not allowed)\n", sender_address);
3388 return EXIT_FAILURE;
3392 /* Paranoia check of maximum lengths of certain strings. There is a check
3393 on the length of the log file path in log.c, which will come into effect
3394 if there are any calls to write the log earlier than this. However, if we
3395 get this far but the string is very long, it is better to stop now than to
3396 carry on and (e.g.) receive a message and then have to collapse. The call to
3397 log_write() from here will cause the ultimate panic collapse if the complete
3398 file name exceeds the buffer length. */
3400 if (Ustrlen(log_file_path) > 200)
3401 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3402 "log_file_path is longer than 200 chars: aborting");
3404 if (Ustrlen(pid_file_path) > 200)
3405 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3406 "pid_file_path is longer than 200 chars: aborting");
3408 if (Ustrlen(spool_directory) > 200)
3409 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3410 "spool_directory is longer than 200 chars: aborting");
3412 /* Length check on the process name given to syslog for its TAG field,
3413 which is only permitted to be 32 characters or less. See RFC 3164. */
3415 if (Ustrlen(syslog_processname) > 32)
3416 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3417 "syslog_processname is longer than 32 chars: aborting");
3419 /* In some operating systems, the environment variable TMPDIR controls where
3420 temporary files are created; Exim doesn't use these (apart from when delivering
3421 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3422 If TMPDIR is found in the environment, reset it to the value defined in the
3423 TMPDIR macro, if this macro is defined. */
3428 for (p = USS environ; *p != NULL; p++)
3430 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3431 Ustrcmp(*p+7, TMPDIR) != 0)
3433 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3434 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3436 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3442 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3443 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3444 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3445 called by a user who has set the TZ variable. This then affects the timestamps
3446 in log files and in Received: headers, and any created Date: header lines. The
3447 required timezone is settable in the configuration file, so nothing can be done
3448 about this earlier - but hopefully nothing will normally be logged earlier than
3449 this. We have to make a new environment if TZ is wrong, but don't bother if
3450 timestamps_utc is set, because then all times are in UTC anyway. */
3452 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3454 timestamps_utc = TRUE;
3458 uschar *envtz = US getenv("TZ");
3459 if ((envtz == NULL && timezone_string != NULL) ||
3461 (timezone_string == NULL ||
3462 Ustrcmp(timezone_string, envtz) != 0)))
3464 uschar **p = USS environ;
3468 while (*p++ != NULL) count++;
3469 if (envtz == NULL) count++;
3470 newp = new = malloc(sizeof(uschar *) * (count + 1));
3471 for (p = USS environ; *p != NULL; p++)
3473 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3476 if (timezone_string != NULL)
3478 *newp = malloc(Ustrlen(timezone_string) + 4);
3479 sprintf(CS *newp++, "TZ=%s", timezone_string);
3484 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3485 tod_stamp(tod_log));
3489 /* Handle the case when we have removed the setuid privilege because of -C or
3490 -D. This means that the caller of Exim was not root.
3492 There is a problem if we were running as the Exim user. The sysadmin may
3493 expect this case to retain privilege because "the binary was called by the
3494 Exim user", but it hasn't, because either the -D option set macros, or the
3495 -C option set a non-trusted configuration file. There are two possibilities:
3497 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3498 to do message deliveries. Thus, the fact that it is running as a
3499 non-privileged user is plausible, and might be wanted in some special
3500 configurations. However, really_exim will have been set false when
3501 privilege was dropped, to stop Exim trying to write to its normal log
3502 files. Therefore, re-enable normal log processing, assuming the sysadmin
3503 has set up the log directory correctly.
3505 (2) If deliver_drop_privilege is not set, the configuration won't work as
3506 apparently intended, and so we log a panic message. In order to retain
3507 root for -C or -D, the caller must either be root or be invoking a
3508 trusted configuration file (when deliver_drop_privilege is false). */
3510 if (removed_privilege && (!trusted_config || macros != NULL) &&
3511 real_uid == exim_uid)
3513 if (deliver_drop_privilege)
3514 really_exim = TRUE; /* let logging work normally */
3516 log_write(0, LOG_MAIN|LOG_PANIC,
3517 "exim user lost privilege for using %s option",
3518 trusted_config? "-D" : "-C");
3521 /* Start up Perl interpreter if Perl support is configured and there is a
3522 perl_startup option, and the configuration or the command line specifies
3523 initializing starting. Note that the global variables are actually called
3524 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3527 if (perl_start_option != 0)
3528 opt_perl_at_start = (perl_start_option > 0);
3529 if (opt_perl_at_start && opt_perl_startup != NULL)
3532 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3533 errstr = init_perl(opt_perl_startup);
3536 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3537 return EXIT_FAILURE;
3539 opt_perl_started = TRUE;
3541 #endif /* EXIM_PERL */
3543 /* Initialise lookup_list
3544 If debugging, already called above via version reporting.
3545 This does mean that debugging causes the list to be initialised while root.
3546 This *should* be harmless -- all modules are loaded from a fixed dir and
3547 it's code that would, if not a module, be part of Exim already. */
3550 /* Log the arguments of the call if the configuration file said so. This is
3551 a debugging feature for finding out what arguments certain MUAs actually use.
3552 Don't attempt it if logging is disabled, or if listing variables or if
3553 verifying/testing addresses or expansions. */
3555 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3556 && really_exim && !list_options && !checking)
3559 uschar *p = big_buffer;
3561 (void)getcwd(CS p+4, big_buffer_size - 4);
3563 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3565 for (i = 0; i < argc; i++)
3567 int len = Ustrlen(argv[i]);
3570 if (p + len + 8 >= big_buffer + big_buffer_size)
3573 log_write(0, LOG_MAIN, "%s", big_buffer);
3574 Ustrcpy(big_buffer, "...");
3577 printing = string_printing(argv[i]);
3578 if (printing[0] == 0) quote = US"\""; else
3580 uschar *pp = printing;
3582 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3584 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3585 (p - big_buffer) - 4), printing, quote);
3589 if ((log_extra_selector & LX_arguments) != 0)
3590 log_write(0, LOG_MAIN, "%s", big_buffer);
3592 debug_printf("%s\n", big_buffer);
3595 /* Set the working directory to be the top-level spool directory. We don't rely
3596 on this in the code, which always uses fully qualified names, but it's useful
3597 for core dumps etc. Don't complain if it fails - the spool directory might not
3598 be generally accessible and calls with the -C option (and others) have lost
3599 privilege by now. Before the chdir, we try to ensure that the directory exists.
3602 if (Uchdir(spool_directory) != 0)
3604 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3605 (void)Uchdir(spool_directory);
3608 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3609 alias file. Exim doesn't have such a concept, but this call is screwed into
3610 Sun's YP makefiles. Handle this by calling a configured script, as the real
3611 user who called Exim. The -oA option can be used to pass an argument to the
3616 (void)fclose(config_file);
3617 if (bi_command != NULL)
3621 argv[i++] = bi_command;
3622 if (alias_arg != NULL) argv[i++] = alias_arg;
3625 setgroups(group_count, group_list);
3626 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3628 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3629 (argv[1] == NULL)? US"" : argv[1]);
3631 execv(CS argv[0], (char *const *)argv);
3632 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3637 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3642 /* If an action on specific messages is requested, or if a daemon or queue
3643 runner is being started, we need to know if Exim was called by an admin user.
3644 This is the case if the real user is root or exim, or if the real group is
3645 exim, or if one of the supplementary groups is exim or a group listed in
3646 admin_groups. We don't fail all message actions immediately if not admin_user,
3647 since some actions can be performed by non-admin users. Instead, set admin_user
3648 for later interrogation. */
3650 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3655 for (i = 0; i < group_count; i++)
3657 if (group_list[i] == exim_gid) admin_user = TRUE;
3658 else if (admin_groups != NULL)
3660 for (j = 1; j <= (int)(admin_groups[0]); j++)
3661 if (admin_groups[j] == group_list[i])
3662 { admin_user = TRUE; break; }
3664 if (admin_user) break;
3668 /* Another group of privileged users are the trusted users. These are root,
3669 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3670 are permitted to specify sender_addresses with -f on the command line, and
3671 other message parameters as well. */
3673 if (real_uid == root_uid || real_uid == exim_uid)
3674 trusted_caller = TRUE;
3679 if (trusted_users != NULL)
3681 for (i = 1; i <= (int)(trusted_users[0]); i++)
3682 if (trusted_users[i] == real_uid)
3683 { trusted_caller = TRUE; break; }
3686 if (!trusted_caller && trusted_groups != NULL)
3688 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3690 if (trusted_groups[i] == real_gid)
3691 trusted_caller = TRUE;
3692 else for (j = 0; j < group_count; j++)
3694 if (trusted_groups[i] == group_list[j])
3695 { trusted_caller = TRUE; break; }
3697 if (trusted_caller) break;
3702 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3703 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3705 /* Only an admin user may start the daemon or force a queue run in the default
3706 configuration, but the queue run restriction can be relaxed. Only an admin
3707 user may request that a message be returned to its sender forthwith. Only an
3708 admin user may specify a debug level greater than D_v (because it might show
3709 passwords, etc. in lookup queries). Only an admin user may request a queue
3710 count. Only an admin user can use the test interface to scan for email
3711 (because Exim will be in the spool dir and able to look at mails). */
3715 BOOL debugset = (debug_selector & ~D_v) != 0;
3716 if (deliver_give_up || daemon_listen || malware_test_file ||
3717 (count_queue && queue_list_requires_admin) ||
3718 (list_queue && queue_list_requires_admin) ||
3719 (queue_interval >= 0 && prod_requires_admin) ||
3720 (debugset && !running_in_test_harness))
3722 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3727 /* If the real user is not root or the exim uid, the argument for passing
3728 in an open TCP/IP connection for another message is not permitted, nor is
3729 running with the -N option for any delivery action, unless this call to exim is
3730 one that supplied an input message, or we are using a patched exim for
3731 regression testing. */
3733 if (real_uid != root_uid && real_uid != exim_uid &&
3734 (continue_hostname != NULL ||
3736 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3737 )) && !running_in_test_harness)
3739 fprintf(stderr, "exim: Permission denied\n");
3740 return EXIT_FAILURE;
3743 /* If the caller is not trusted, certain arguments are ignored when running for
3744 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3745 Note that authority for performing certain actions on messages is tested in the
3746 queue_action() function. */
3748 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3750 sender_host_name = sender_host_address = interface_address =
3751 sender_ident = received_protocol = NULL;
3752 sender_host_port = interface_port = 0;
3753 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3756 /* If a sender host address is set, extract the optional port number off the
3757 end of it and check its syntax. Do the same thing for the interface address.
3758 Exim exits if the syntax is bad. */
3762 if (sender_host_address != NULL)
3763 sender_host_port = check_port(sender_host_address);
3764 if (interface_address != NULL)
3765 interface_port = check_port(interface_address);
3768 /* If an SMTP message is being received check to see if the standard input is a
3769 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3770 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3775 union sockaddr_46 inetd_sock;
3776 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3777 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3779 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3780 if (family == AF_INET || family == AF_INET6)
3782 union sockaddr_46 interface_sock;
3783 size = sizeof(interface_sock);
3785 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3786 interface_address = host_ntoa(-1, &interface_sock, NULL,
3789 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3791 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3794 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3795 NULL, &sender_host_port);
3796 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3797 "inetd is not supported when mua_wrapper is set");
3802 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3803 return EXIT_FAILURE;
3809 /* If the load average is going to be needed while receiving a message, get it
3810 now for those OS that require the first call to os_getloadavg() to be done as
3811 root. There will be further calls later for each message received. */
3813 #ifdef LOAD_AVG_NEEDS_ROOT
3814 if (receiving_message &&
3815 (queue_only_load >= 0 ||
3816 (is_inetd && smtp_load_reserve >= 0)
3819 load_average = OS_GETLOADAVG();
3823 /* The queue_only configuration option can be overridden by -odx on the command
3824 line, except that if queue_only_override is false, queue_only cannot be unset
3825 from the command line. */
3827 if (queue_only_set && (queue_only_override || arg_queue_only))
3828 queue_only = arg_queue_only;
3830 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3833 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3834 if (arg_smtp_receive_timeout >= 0)
3835 smtp_receive_timeout = arg_smtp_receive_timeout;
3837 /* If Exim was started with root privilege, unless we have already removed the
3838 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3839 except when starting the daemon or doing some kind of delivery or address
3840 testing (-bt). These are the only cases when root need to be retained. We run
3841 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3842 retained only for starting the daemon. We always do the initgroups() in this
3843 situation (controlled by the TRUE below), in order to be as close as possible
3844 to the state Exim usually runs in. */
3846 if (!unprivileged && /* originally had root AND */
3847 !removed_privilege && /* still got root AND */
3848 !daemon_listen && /* not starting the daemon */
3849 queue_interval <= 0 && /* (either kind of daemon) */
3851 deliver_drop_privilege || /* requested unprivileged */
3853 queue_interval < 0 && /* not running the queue */
3854 (msg_action_arg < 0 || /* and */
3855 msg_action != MSG_DELIVER) && /* not delivering and */
3856 (!checking || !address_test_mode) /* not address checking */
3860 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3863 /* When we are retaining a privileged uid, we still change to the exim gid. */
3865 else setgid(exim_gid);
3867 /* Handle a request to scan a file for malware */
3868 if (malware_test_file)
3870 #ifdef WITH_CONTENT_SCAN
3872 set_process_info("scanning file for malware");
3873 result = malware_in_file(malware_test_file);
3876 printf("No malware found.\n");
3881 printf("Malware lookup returned non-okay/fail: %d\n", result);
3885 printf("Malware found: %s\n", malware_name);
3887 printf("Malware scan detected malware of unknown name.\n");
3889 printf("Malware scanning not enabled at compile time.\n");
3894 /* Handle a request to list the delivery queue */
3898 set_process_info("listing the queue");
3899 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3903 /* Handle a request to count the delivery queue */
3907 set_process_info("counting the queue");
3912 /* Handle actions on specific messages, except for the force delivery and
3913 message load actions, which are done below. Some actions take a whole list of
3914 message ids, which are known to continue up to the end of the arguments. Others
3915 take a single message id and then operate on the recipients list. */
3917 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3919 int yield = EXIT_SUCCESS;
3920 set_process_info("acting on specified messages");
3922 if (!one_msg_action)
3924 for (i = msg_action_arg; i < argc; i++)
3925 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3926 yield = EXIT_FAILURE;
3929 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3930 recipients_arg)) yield = EXIT_FAILURE;
3934 /* All the modes below here require the remaining configuration sections
3935 to be read, except that we can skip over the ACL setting when delivering
3936 specific messages, or doing a queue run. (For various testing cases we could
3937 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3940 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3942 /* The configuration data will have been read into POOL_PERM because we won't
3943 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3944 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3945 configuration were read into POOL_MAIN, because we don't do any resets till
3946 later on. However, it seems right, and it does ensure that both pools get used.
3949 store_pool = POOL_MAIN;
3951 /* Handle the -brt option. This is for checking out retry configurations.
3952 The next three arguments are a domain name or a complete address, and
3953 optionally two error numbers. All it does is to call the function that
3954 scans the retry configuration data. */
3956 if (test_retry_arg >= 0)
3958 retry_config *yield;
3959 int basic_errno = 0;
3963 if (test_retry_arg >= argc)
3965 printf("-brt needs a domain or address argument\n");
3966 exim_exit(EXIT_FAILURE);
3968 s1 = argv[test_retry_arg++];
3971 /* If the first argument contains no @ and no . it might be a local user
3972 or it might be a single-component name. Treat as a domain. */
3974 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3976 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3977 "being \ntreated as a one-component domain, not as a local part.\n\n",
3981 /* There may be an optional second domain arg. */
3983 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3984 s2 = argv[test_retry_arg++];
3986 /* The final arg is an error name */
3988 if (test_retry_arg < argc)
3990 uschar *ss = argv[test_retry_arg];
3992 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3995 printf("%s\n", CS error);
3996 return EXIT_FAILURE;
3999 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4000 code > 100 as an error is for matching codes to the decade. Turn them into
4001 a real error code, off the decade. */
4003 if (basic_errno == ERRNO_MAIL4XX ||
4004 basic_errno == ERRNO_RCPT4XX ||
4005 basic_errno == ERRNO_DATA4XX)
4007 int code = (more_errno >> 8) & 255;
4009 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4010 else if (code > 100)
4011 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4015 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4016 if (yield == NULL) printf("No retry information found\n"); else
4019 more_errno = yield->more_errno;
4020 printf("Retry rule: %s ", yield->pattern);
4022 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4024 printf("quota%s%s ",
4025 (more_errno > 0)? "_" : "",
4026 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4028 else if (yield->basic_errno == ECONNREFUSED)
4030 printf("refused%s%s ",
4031 (more_errno > 0)? "_" : "",
4032 (more_errno == 'M')? "MX" :
4033 (more_errno == 'A')? "A" : "");
4035 else if (yield->basic_errno == ETIMEDOUT)
4038 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4040 if (more_errno != 0) printf("_%s",
4041 (more_errno == 'M')? "MX" : "A");
4044 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4045 printf("auth_failed ");
4048 for (r = yield->rules; r != NULL; r = r->next)
4050 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4051 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4057 printf(",%d.", x/1000);
4071 exim_exit(EXIT_SUCCESS);
4074 /* Handle a request to list one or more configuration options */
4078 set_process_info("listing variables");
4079 if (recipients_arg >= argc) readconf_print(US"all", NULL);
4080 else for (i = recipients_arg; i < argc; i++)
4083 (Ustrcmp(argv[i], "router") == 0 ||
4084 Ustrcmp(argv[i], "transport") == 0 ||
4085 Ustrcmp(argv[i], "authenticator") == 0 ||
4086 Ustrcmp(argv[i], "macro") == 0))
4088 readconf_print(argv[i+1], argv[i]);
4091 else readconf_print(argv[i], NULL);
4093 exim_exit(EXIT_SUCCESS);
4097 /* Handle a request to deliver one or more messages that are already on the
4098 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4099 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4101 Delivery of specific messages is typically used for a small number when
4102 prodding by hand (when the option forced_delivery will be set) or when
4103 re-execing to regain root privilege. Each message delivery must happen in a
4104 separate process, so we fork a process for each one, and run them sequentially
4105 so that debugging output doesn't get intertwined, and to avoid spawning too
4106 many processes if a long list is given. However, don't fork for the last one;
4107 this saves a process in the common case when Exim is called to deliver just one
4110 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4112 if (prod_requires_admin && !admin_user)
4114 fprintf(stderr, "exim: Permission denied\n");
4115 exim_exit(EXIT_FAILURE);
4117 set_process_info("delivering specified messages");
4118 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4119 for (i = msg_action_arg; i < argc; i++)
4124 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4125 else if ((pid = fork()) == 0)
4127 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4128 _exit(EXIT_SUCCESS);
4132 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4134 exim_exit(EXIT_FAILURE);
4138 exim_exit(EXIT_SUCCESS);
4142 /* If only a single queue run is requested, without SMTP listening, we can just
4143 turn into a queue runner, with an optional starting message id. */
4145 if (queue_interval == 0 && !daemon_listen)
4147 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4148 (start_queue_run_id == NULL)? US"" : US" starting at ",
4149 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4150 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4151 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4152 set_process_info("running the queue (single queue run)");
4153 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4154 exim_exit(EXIT_SUCCESS);
4158 /* Find the login name of the real user running this process. This is always
4159 needed when receiving a message, because it is written into the spool file. It
4160 may also be used to construct a from: or a sender: header, and in this case we
4161 need the user's full name as well, so save a copy of it, checked for RFC822
4162 syntax and munged if necessary, if it hasn't previously been set by the -F
4163 argument. We may try to get the passwd entry more than once, in case NIS or
4164 other delays are in evidence. Save the home directory for use in filter testing
4169 if ((pw = getpwuid(real_uid)) != NULL)
4171 originator_login = string_copy(US pw->pw_name);
4172 originator_home = string_copy(US pw->pw_dir);
4174 /* If user name has not been set by -F, set it from the passwd entry
4175 unless -f has been used to set the sender address by a trusted user. */
4177 if (originator_name == NULL)
4179 if (sender_address == NULL ||
4180 (!trusted_caller && filter_test == FTEST_NONE))
4182 uschar *name = US pw->pw_gecos;
4183 uschar *amp = Ustrchr(name, '&');
4186 /* Most Unix specify that a '&' character in the gecos field is
4187 replaced by a copy of the login name, and some even specify that
4188 the first character should be upper cased, so that's what we do. */
4193 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4194 amp - name, name, &loffset, originator_login, amp + 1);
4195 buffer[loffset] = toupper(buffer[loffset]);
4199 /* If a pattern for matching the gecos field was supplied, apply
4200 it and then expand the name string. */
4202 if (gecos_pattern != NULL && gecos_name != NULL)
4205 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4207 if (regex_match_and_setup(re, name, 0, -1))
4209 uschar *new_name = expand_string(gecos_name);
4211 if (new_name != NULL)
4213 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4214 "gecos field \"%s\"\n", new_name, name);
4217 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4218 "\"%s\": %s\n", gecos_name, expand_string_message);
4220 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4221 "gecos field \"%s\"\n", gecos_pattern, name);
4222 store_free((void *)re);
4224 originator_name = string_copy(name);
4227 /* A trusted caller has used -f but not -F */
4229 else originator_name = US"";
4232 /* Break the retry loop */
4237 if (++i > finduser_retries) break;
4241 /* If we cannot get a user login, log the incident and give up, unless the
4242 configuration specifies something to use. When running in the test harness,
4243 any setting of unknown_login overrides the actual name. */
4245 if (originator_login == NULL || running_in_test_harness)
4247 if (unknown_login != NULL)
4249 originator_login = expand_string(unknown_login);
4250 if (originator_name == NULL && unknown_username != NULL)
4251 originator_name = expand_string(unknown_username);
4252 if (originator_name == NULL) originator_name = US"";
4254 if (originator_login == NULL)
4255 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4259 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4262 originator_name = string_copy(parse_fix_phrase(originator_name,
4263 Ustrlen(originator_name), big_buffer, big_buffer_size));
4265 /* If a message is created by this call of Exim, the uid/gid of its originator
4266 are those of the caller. These values are overridden if an existing message is
4267 read in from the spool. */
4269 originator_uid = real_uid;
4270 originator_gid = real_gid;
4272 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4273 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4275 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4276 returns. We leave this till here so that the originator_ fields are available
4277 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4280 if (daemon_listen || queue_interval > 0)
4284 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4285 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4286 "mua_wrapper is set");
4291 /* If the sender ident has not been set (by a trusted caller) set it to
4292 the caller. This will get overwritten below for an inetd call. If a trusted
4293 caller has set it empty, unset it. */
4295 if (sender_ident == NULL) sender_ident = originator_login;
4296 else if (sender_ident[0] == 0) sender_ident = NULL;
4298 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4299 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4300 originator_* variables set. */
4302 if (test_rewrite_arg >= 0)
4304 really_exim = FALSE;
4305 if (test_rewrite_arg >= argc)
4307 printf("-brw needs an address argument\n");
4308 exim_exit(EXIT_FAILURE);
4310 rewrite_test(argv[test_rewrite_arg]);
4311 exim_exit(EXIT_SUCCESS);
4314 /* A locally-supplied message is considered to be coming from a local user
4315 unless a trusted caller supplies a sender address with -f, or is passing in the
4316 message via SMTP (inetd invocation or otherwise). */
4318 if ((sender_address == NULL && !smtp_input) ||
4319 (!trusted_caller && filter_test == FTEST_NONE))
4321 sender_local = TRUE;
4323 /* A trusted caller can supply authenticated_sender and authenticated_id
4324 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4325 defaults except when host checking. */
4327 if (authenticated_sender == NULL && !host_checking)
4328 authenticated_sender = string_sprintf("%s@%s", originator_login,
4329 qualify_domain_sender);
4330 if (authenticated_id == NULL && !host_checking)
4331 authenticated_id = originator_login;
4334 /* Trusted callers are always permitted to specify the sender address.
4335 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4336 is specified is the empty address. However, if a trusted caller does not
4337 specify a sender address for SMTP input, we leave sender_address unset. This
4338 causes the MAIL commands to be honoured. */
4340 if ((!smtp_input && sender_address == NULL) ||
4341 !receive_check_set_sender(sender_address))
4343 /* Either the caller is not permitted to set a general sender, or this is
4344 non-SMTP input and the trusted caller has not set a sender. If there is no
4345 sender, or if a sender other than <> is set, override with the originator's
4346 login (which will get qualified below), except when checking things. */
4348 if (sender_address == NULL /* No sender_address set */
4350 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4351 !checking && /* Not running tests, AND */
4352 filter_test == FTEST_NONE)) /* Not testing a filter */
4354 sender_address = originator_login;
4355 sender_address_forced = FALSE;
4356 sender_address_domain = 0;
4360 /* Remember whether an untrusted caller set the sender address */
4362 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4364 /* Ensure that the sender address is fully qualified unless it is the empty
4365 address, which indicates an error message, or doesn't exist (root caller, smtp
4366 interface, no -f argument). */
4368 if (sender_address != NULL && sender_address[0] != 0 &&
4369 sender_address_domain == 0)
4370 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4371 qualify_domain_sender);
4373 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4375 /* Handle a request to verify a list of addresses, or test them for delivery.
4376 This must follow the setting of the sender address, since routers can be
4377 predicated upon the sender. If no arguments are given, read addresses from
4378 stdin. Set debug_level to at least D_v to get full output for address testing.
4381 if (verify_address_mode || address_test_mode)
4384 int flags = vopt_qualify;
4386 if (verify_address_mode)
4388 if (!verify_as_sender) flags |= vopt_is_recipient;
4389 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4394 flags |= vopt_is_recipient;
4395 debug_selector |= D_v;
4396 debug_file = stderr;
4397 debug_fd = fileno(debug_file);
4398 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4401 if (recipients_arg < argc)
4403 while (recipients_arg < argc)
4405 uschar *s = argv[recipients_arg++];
4408 BOOL finished = FALSE;
4409 uschar *ss = parse_find_address_end(s, FALSE);
4410 if (*ss == ',') *ss = 0; else finished = TRUE;
4411 test_address(s, flags, &exit_value);
4414 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4421 uschar *s = get_stdinput(NULL, NULL);
4422 if (s == NULL) break;
4423 test_address(s, flags, &exit_value);
4427 exim_exit(exit_value);
4430 /* Handle expansion checking. Either expand items on the command line, or read
4431 from stdin if there aren't any. If -Mset was specified, load the message so
4432 that its variables can be used, but restrict this facility to admin users.
4433 Otherwise, if -bem was used, read a message from stdin. */
4437 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4439 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4442 fprintf(stderr, "exim: permission denied\n");
4445 message_id = argv[msg_action_arg];
4446 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4447 if (!spool_open_datafile(message_id))
4448 printf ("Failed to load message datafile %s\n", message_id);
4449 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4450 printf ("Failed to load message %s\n", message_id);
4453 /* Read a test message from a file. We fudge it up to be on stdin, saving
4454 stdin itself for later reading of expansion strings. */
4456 else if (expansion_test_message != NULL)
4458 int save_stdin = dup(0);
4459 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4462 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4464 return EXIT_FAILURE;
4467 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4468 message_ended = END_NOTENDED;
4469 read_message_body(receive_msg(extract_recipients));
4470 message_linecount += body_linecount;
4471 (void)dup2(save_stdin, 0);
4472 (void)close(save_stdin);
4473 clearerr(stdin); /* Required by Darwin */
4476 /* Allow $recipients for this testing */
4478 enable_dollar_recipients = TRUE;
4480 /* Expand command line items */
4482 if (recipients_arg < argc)
4484 while (recipients_arg < argc)
4486 uschar *s = argv[recipients_arg++];
4487 uschar *ss = expand_string(s);
4488 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4489 else printf("%s\n", CS ss);
4497 char *(*fn_readline)(char *) = NULL;
4498 char *(*fn_addhist)(char *) = NULL;
4501 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4507 uschar *source = get_stdinput(fn_readline, fn_addhist);
4508 if (source == NULL) break;
4509 ss = expand_string(source);
4511 printf ("Failed: %s\n", expand_string_message);
4512 else printf("%s\n", CS ss);
4516 if (dlhandle != NULL) dlclose(dlhandle);
4520 /* The data file will be open after -Mset */
4522 if (deliver_datafile >= 0)
4524 (void)close(deliver_datafile);
4525 deliver_datafile = -1;
4528 exim_exit(EXIT_SUCCESS);
4532 /* The active host name is normally the primary host name, but it can be varied
4533 for hosts that want to play several parts at once. We need to ensure that it is
4534 set for host checking, and for receiving messages. */
4536 smtp_active_hostname = primary_hostname;
4537 if (raw_active_hostname != NULL)
4539 uschar *nah = expand_string(raw_active_hostname);
4542 if (!expand_string_forcedfail)
4543 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4544 "(smtp_active_hostname): %s", raw_active_hostname,
4545 expand_string_message);
4547 else if (nah[0] != 0) smtp_active_hostname = nah;
4550 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4551 given IP address so that the blocking and relay configuration can be tested.
4552 Unless a sender_ident was set by -oMt, we discard it (the default is the
4553 caller's login name). An RFC 1413 call is made only if we are running in the
4554 test harness and an incoming interface and both ports are specified, because
4555 there is no TCP/IP call to find the ident for. */
4562 if (!sender_ident_set)
4564 sender_ident = NULL;
4565 if (running_in_test_harness && sender_host_port != 0 &&
4566 interface_address != NULL && interface_port != 0)
4567 verify_get_ident(1413);
4570 /* In case the given address is a non-canonical IPv6 address, canonicize
4571 it. The code works for both IPv4 and IPv6, as it happens. */
4573 size = host_aton(sender_host_address, x);
4574 sender_host_address = store_get(48); /* large enough for full IPv6 */
4575 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4577 /* Now set up for testing */
4579 host_build_sender_fullhost();
4583 sender_local = FALSE;
4584 sender_host_notsocket = TRUE;
4585 debug_file = stderr;
4586 debug_fd = fileno(debug_file);
4587 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4588 "**** but without any ident (RFC 1413) callback.\n"
4589 "**** This is not for real!\n\n",
4590 sender_host_address);
4592 if (verify_check_host(&hosts_connection_nolog) == OK)
4593 log_write_selector &= ~L_smtp_connection;
4594 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4596 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4597 because a log line has already been written for all its failure exists
4598 (usually "connection refused: <reason>") and writing another one is
4599 unnecessary clutter. */
4601 if (smtp_start_session())
4603 reset_point = store_get(0);
4606 store_reset(reset_point);
4607 if (smtp_setup_msg() <= 0) break;
4608 if (!receive_msg(FALSE)) break;
4612 exim_exit(EXIT_SUCCESS);
4616 /* Arrange for message reception if recipients or SMTP were specified;
4617 otherwise complain unless a version print (-bV) happened or this is a filter
4618 verification test. In the former case, show the configuration file name. */
4620 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4622 if (version_printed)
4624 printf("Configuration file is %s\n", config_main_filename);
4625 return EXIT_SUCCESS;
4628 if (filter_test == FTEST_NONE)
4629 exim_usage(called_as);
4633 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4634 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4635 that we are not called from inetd, because that is rejected above. The
4636 following configuration settings are forced here:
4638 (1) Synchronous delivery (-odi)
4639 (2) Errors to stderr (-oep == -oeq)
4640 (3) No parallel remote delivery
4641 (4) Unprivileged delivery
4643 We don't force overall queueing options because there are several of them;
4644 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4645 to override any SMTP queueing. */
4649 synchronous_delivery = TRUE;
4650 arg_error_handling = ERRORS_STDERR;
4651 remote_max_parallel = 1;
4652 deliver_drop_privilege = TRUE;
4654 queue_smtp_domains = NULL;
4658 /* Prepare to accept one or more new messages on the standard input. When a
4659 message has been read, its id is returned in message_id[]. If doing immediate
4660 delivery, we fork a delivery process for each received message, except for the
4661 last one, where we can save a process switch.
4663 It is only in non-smtp mode that error_handling is allowed to be changed from
4664 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4665 sendmail error modes other than -oem ever actually used? Later: yes.) */
4667 if (!smtp_input) error_handling = arg_error_handling;
4669 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4670 logging being sent down the socket and make an identd call to get the
4675 (void)fclose(stderr);
4676 exim_nullstd(); /* Re-open to /dev/null */
4677 verify_get_ident(IDENT_PORT);
4678 host_build_sender_fullhost();
4679 set_process_info("handling incoming connection from %s via inetd",
4683 /* If the sender host address has been set, build sender_fullhost if it hasn't
4684 already been done (which it will have been for inetd). This caters for the
4685 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4686 so that the test for IP options is skipped for -bs input. */
4688 if (sender_host_address != NULL && sender_fullhost == NULL)
4690 host_build_sender_fullhost();
4691 set_process_info("handling incoming connection from %s via -oMa",
4693 sender_host_notsocket = TRUE;
4696 /* Otherwise, set the sender host as unknown except for inetd calls. This
4697 prevents host checking in the case of -bs not from inetd and also for -bS. */
4699 else if (!is_inetd) sender_host_unknown = TRUE;
4701 /* If stdout does not exist, then dup stdin to stdout. This can happen
4702 if exim is started from inetd. In this case fd 0 will be set to the socket,
4703 but fd 1 will not be set. This also happens for passed SMTP channels. */
4705 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4707 /* Set up the incoming protocol name and the state of the program. Root is
4708 allowed to force received protocol via the -oMr option above. If we have come
4709 via inetd, the process info has already been set up. We don't set
4710 received_protocol here for smtp input, as it varies according to
4711 batch/HELO/EHLO/AUTH/TLS. */
4715 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4716 smtp_batched_input? "batched " : "",
4717 (sender_address!= NULL)? sender_address : originator_login);
4721 if (received_protocol == NULL)
4722 received_protocol = string_sprintf("local%s", called_as);
4723 set_process_info("accepting a local non-SMTP message from <%s>",
4727 /* Initialize the session_local_queue-only flag (this will be ignored if
4728 mua_wrapper is set) */
4731 session_local_queue_only = queue_only;
4733 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4734 the spool if so configured. On failure, we must not attempt to send an error
4735 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4736 error code is given.) */
4738 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4740 fprintf(stderr, "exim: insufficient disk space\n");
4741 return EXIT_FAILURE;
4744 /* If this is smtp input of any kind, real or batched, handle the start of the
4747 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4748 because a log line has already been written for all its failure exists
4749 (usually "connection refused: <reason>") and writing another one is
4750 unnecessary clutter. */
4756 if (verify_check_host(&hosts_connection_nolog) == OK)
4757 log_write_selector &= ~L_smtp_connection;
4758 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4759 if (!smtp_start_session())
4762 exim_exit(EXIT_SUCCESS);
4766 /* Otherwise, set up the input size limit here. */
4770 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4771 if (expand_string_message != NULL)
4773 if (thismessage_size_limit == -1)
4774 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4775 "message_size_limit: %s", expand_string_message);
4777 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4778 "message_size_limit: %s", expand_string_message);
4782 /* Loop for several messages when reading SMTP input. If we fork any child
4783 processes, we don't want to wait for them unless synchronous delivery is
4784 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4785 same as SIG_DFL, despite the fact that documentation often lists the default as
4786 "ignore". This is a confusing area. This is what I know:
4788 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4789 processes that complete simply to go away without ever becoming defunct. You
4790 can't then wait for them - but we don't want to wait for them in the
4791 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4792 happen for all OS (e.g. *BSD is different).
4794 But that's not the end of the story. Some (many? all?) systems have the
4795 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4796 has by default, so it seems that the difference is merely one of default
4797 (compare restarting vs non-restarting signals).
4799 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4800 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4801 of the loop below. Paranoia rules.
4803 February 2003: That's *still* not the end of the story. There are now versions
4804 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4805 process then calls waitpid(), a grumble is written to the system log, because
4806 this is logically inconsistent. In other words, it doesn't like the paranoia.
4807 As a consequenc of this, the waitpid() below is now excluded if we are sure
4808 that SIG_IGN works. */
4810 if (!synchronous_delivery)
4813 struct sigaction act;
4814 act.sa_handler = SIG_IGN;
4815 sigemptyset(&(act.sa_mask));
4816 act.sa_flags = SA_NOCLDWAIT;
4817 sigaction(SIGCHLD, &act, NULL);
4819 signal(SIGCHLD, SIG_IGN);
4823 /* Save the current store pool point, for resetting at the start of
4824 each message, and save the real sender address, if any. */
4826 reset_point = store_get(0);
4827 real_sender_address = sender_address;
4829 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4830 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4835 store_reset(reset_point);
4838 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4839 input and build the recipients list, before calling receive_msg() to read the
4840 message proper. Whatever sender address is given in the SMTP transaction is
4841 often ignored for local senders - we use the actual sender, which is normally
4842 either the underlying user running this process or a -f argument provided by
4843 a trusted caller. It is saved in real_sender_address. The test for whether to
4844 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4849 if ((rc = smtp_setup_msg()) > 0)
4851 if (real_sender_address != NULL &&
4852 !receive_check_set_sender(sender_address))
4854 sender_address = raw_sender = real_sender_address;
4855 sender_address_unrewritten = NULL;
4858 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4859 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4860 the very end. The result of the ACL is ignored (as for other non-SMTP
4861 messages). It is run for its potential side effects. */
4863 if (smtp_batched_input && acl_not_smtp_start != NULL)
4865 uschar *user_msg, *log_msg;
4866 enable_dollar_recipients = TRUE;
4867 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4868 &user_msg, &log_msg);
4869 enable_dollar_recipients = FALSE;
4872 /* Now get the data for the message */
4874 more = receive_msg(extract_recipients);
4875 if (message_id[0] == 0)
4878 smtp_log_no_mail(); /* Log no mail if configured */
4879 exim_exit(EXIT_FAILURE);
4884 smtp_log_no_mail(); /* Log no mail if configured */
4885 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4889 /* In the non-SMTP case, we have all the information from the command
4890 line, but must process it in case it is in the more general RFC822
4891 format, and in any case, to detect syntax errors. Also, it appears that
4892 the use of comma-separated lists as single arguments is common, so we
4893 had better support them. */
4899 int count = argc - recipients_arg;
4900 uschar **list = argv + recipients_arg;
4902 /* These options cannot be changed dynamically for non-SMTP messages */
4904 active_local_sender_retain = local_sender_retain;
4905 active_local_from_check = local_from_check;
4907 /* Save before any rewriting */
4909 raw_sender = string_copy(sender_address);
4911 /* Loop for each argument */
4913 for (i = 0; i < count; i++)
4915 int start, end, domain;
4917 uschar *s = list[i];
4919 /* Loop for each comma-separated address */
4923 BOOL finished = FALSE;
4925 uschar *ss = parse_find_address_end(s, FALSE);
4927 if (*ss == ',') *ss = 0; else finished = TRUE;
4929 /* Check max recipients - if -t was used, these aren't recipients */
4931 if (recipients_max > 0 && ++rcount > recipients_max &&
4932 !extract_recipients)
4934 if (error_handling == ERRORS_STDERR)
4936 fprintf(stderr, "exim: too many recipients\n");
4937 exim_exit(EXIT_FAILURE);
4942 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4943 errors_sender_rc : EXIT_FAILURE;
4948 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4950 if (domain == 0 && !allow_unqualified_recipient)
4953 errmess = US"unqualified recipient address not allowed";
4956 if (recipient == NULL)
4958 if (error_handling == ERRORS_STDERR)
4960 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4961 string_printing(list[i]), errmess);
4962 exim_exit(EXIT_FAILURE);
4968 eblock.text1 = string_printing(list[i]);
4969 eblock.text2 = errmess;
4971 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4972 errors_sender_rc : EXIT_FAILURE;
4976 receive_add_recipient(recipient, -1);
4979 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4983 /* Show the recipients when debugging */
4988 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4989 if (recipients_list != NULL)
4991 debug_printf("Recipients:\n");
4992 for (i = 0; i < recipients_count; i++)
4993 debug_printf(" %s\n", recipients_list[i].address);
4997 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4998 ignored; rejecting here would just add complication, and it can just as
4999 well be done later. Allow $recipients to be visible in the ACL. */
5001 if (acl_not_smtp_start != NULL)
5003 uschar *user_msg, *log_msg;
5004 enable_dollar_recipients = TRUE;
5005 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5006 &user_msg, &log_msg);
5007 enable_dollar_recipients = FALSE;
5010 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5011 will just read the headers for the message, and not write anything onto the
5014 message_ended = END_NOTENDED;
5015 more = receive_msg(extract_recipients);
5017 /* more is always FALSE here (not SMTP message) when reading a message
5018 for real; when reading the headers of a message for filter testing,
5019 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5021 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5022 } /* Non-SMTP message reception */
5024 /* If this is a filter testing run, there are headers in store, but
5025 no message on the spool. Run the filtering code in testing mode, setting
5026 the domain to the qualify domain and the local part to the current user,
5027 unless they have been set by options. The prefix and suffix are left unset
5028 unless specified. The the return path is set to to the sender unless it has
5029 already been set from a return-path header in the message. */
5031 if (filter_test != FTEST_NONE)
5033 deliver_domain = (ftest_domain != NULL)?
5034 ftest_domain : qualify_domain_recipient;
5035 deliver_domain_orig = deliver_domain;
5036 deliver_localpart = (ftest_localpart != NULL)?
5037 ftest_localpart : originator_login;
5038 deliver_localpart_orig = deliver_localpart;
5039 deliver_localpart_prefix = ftest_prefix;
5040 deliver_localpart_suffix = ftest_suffix;
5041 deliver_home = originator_home;
5043 if (return_path == NULL)
5045 printf("Return-path copied from sender\n");
5046 return_path = string_copy(sender_address);
5050 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5052 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5054 receive_add_recipient(
5055 string_sprintf("%s%s%s@%s",
5056 (ftest_prefix == NULL)? US"" : ftest_prefix,
5058 (ftest_suffix == NULL)? US"" : ftest_suffix,
5059 deliver_domain), -1);
5061 printf("Recipient = %s\n", recipients_list[0].address);
5062 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5063 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5065 (void)chdir("/"); /* Get away from wherever the user is running this from */
5067 /* Now we run either a system filter test, or a user filter test, or both.
5068 In the latter case, headers added by the system filter will persist and be
5069 available to the user filter. We need to copy the filter variables
5072 if ((filter_test & FTEST_SYSTEM) != 0)
5074 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5075 exim_exit(EXIT_FAILURE);
5078 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5080 if ((filter_test & FTEST_USER) != 0)
5082 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5083 exim_exit(EXIT_FAILURE);
5086 exim_exit(EXIT_SUCCESS);
5089 /* Else act on the result of message reception. We should not get here unless
5090 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5091 will be TRUE. If it is not, check on the number of messages received in this
5094 if (!session_local_queue_only &&
5095 smtp_accept_queue_per_connection > 0 &&
5096 receive_messagecount > smtp_accept_queue_per_connection)
5098 session_local_queue_only = TRUE;
5099 queue_only_reason = 2;
5102 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5103 and queue_only_load is set, check that the load average is below it. If it is
5104 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5105 default), we put the whole session into queue_only mode. It then remains this
5106 way for any subsequent messages on the same SMTP connection. This is a
5107 deliberate choice; even though the load average may fall, it doesn't seem
5108 right to deliver later messages on the same call when not delivering earlier
5109 ones. However, there are odd cases where this is not wanted, so this can be
5110 changed by setting queue_only_load_latch false. */
5112 local_queue_only = session_local_queue_only;
5113 if (!local_queue_only && queue_only_load >= 0)
5115 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5116 if (local_queue_only)
5118 queue_only_reason = 3;
5119 if (queue_only_load_latch) session_local_queue_only = TRUE;
5123 /* If running as an MUA wrapper, all queueing options and freezing options
5127 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5129 /* Log the queueing here, when it will get a message id attached, but
5130 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5133 if (local_queue_only) switch(queue_only_reason)
5136 log_write(L_delay_delivery,
5137 LOG_MAIN, "no immediate delivery: more than %d messages "
5138 "received in one connection", smtp_accept_queue_per_connection);
5142 log_write(L_delay_delivery,
5143 LOG_MAIN, "no immediate delivery: load average %.2f",
5144 (double)load_average/1000.0);
5148 /* Else do the delivery unless the ACL or local_scan() called for queue only
5149 or froze the message. Always deliver in a separate process. A fork failure is
5150 not a disaster, as the delivery will eventually happen on a subsequent queue
5151 run. The search cache must be tidied before the fork, as the parent will
5152 do it before exiting. The child will trigger a lookup failure and
5153 thereby defer the delivery if it tries to use (for example) a cached ldap
5154 connection that the parent has called unbind on. */
5156 else if (!queue_only_policy && !deliver_freeze)
5161 if ((pid = fork()) == 0)
5164 close_unwanted(); /* Close unwanted file descriptors and TLS */
5165 exim_nullstd(); /* Ensure std{in,out,err} exist */
5167 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5168 mode, deliver_drop_privilege is forced TRUE). */
5170 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5172 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5174 /* Control does not return here. */
5177 /* No need to re-exec */
5179 rc = deliver_message(message_id, FALSE, FALSE);
5181 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5182 EXIT_SUCCESS : EXIT_FAILURE);
5187 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5188 "process: %s", strerror(errno));
5191 /* In the parent, wait if synchronous delivery is required. This will
5192 always be the case in MUA wrapper mode. */
5194 else if (synchronous_delivery)
5197 while (wait(&status) != pid);
5198 if ((status & 0x00ff) != 0)
5199 log_write(0, LOG_MAIN|LOG_PANIC,
5200 "process %d crashed with signal %d while delivering %s",
5201 (int)pid, status & 0x00ff, message_id);
5202 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5206 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5207 automatically reaps children (see comments above the loop), clear away any
5208 finished subprocesses here, in case there are lots of messages coming in
5209 from the same source. */
5211 #ifndef SIG_IGN_WORKS
5212 while (waitpid(-1, NULL, WNOHANG) > 0);
5216 exim_exit(EXIT_SUCCESS); /* Never returns */
5217 return 0; /* To stop compiler warning */