1 /* $Cambridge: exim/src/src/exim.c,v 1.67 2010/06/06 00:27:52 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. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
390 filename the file name
391 options the fopen() options
392 mode the required mode
394 Returns: the fopened FILE or NULL
398 modefopen(uschar *filename, char *options, mode_t mode)
400 mode_t saved_umask = umask(0777);
401 FILE *f = Ufopen(filename, options);
402 (void)umask(saved_umask);
403 if (f != NULL) (void)fchmod(fileno(f), mode);
410 /*************************************************
411 * Ensure stdin, stdout, and stderr exist *
412 *************************************************/
414 /* Some operating systems grumble if an exec() happens without a standard
415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
416 file will be opened and will use these fd values, and then some other bit of
417 code will assume, for example, that it can write error messages to stderr.
418 This function ensures that fds 0, 1, and 2 are open if they do not already
419 exist, by connecting them to /dev/null.
421 This function is also used to ensure that std{in,out,err} exist at all times,
422 so that if any library that Exim calls tries to use them, it doesn't crash.
434 for (i = 0; i <= 2; i++)
436 if (fstat(i, &statbuf) < 0 && errno == EBADF)
438 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
439 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
440 string_open_failed(errno, "/dev/null"));
441 if (devnull != i) (void)dup2(devnull, i);
444 if (devnull > 2) (void)close(devnull);
450 /*************************************************
451 * Close unwanted file descriptors for delivery *
452 *************************************************/
454 /* This function is called from a new process that has been forked to deliver
455 an incoming message, either directly, or using exec.
457 We want any smtp input streams to be closed in this new process. However, it
458 has been observed that using fclose() here causes trouble. When reading in -bS
459 input, duplicate copies of messages have been seen. The files will be sharing a
460 file pointer with the parent process, and it seems that fclose() (at least on
461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
462 least sometimes. Hence we go for closing the underlying file descriptors.
464 If TLS is active, we want to shut down the TLS library, but without molesting
465 the parent's SSL connection.
467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
468 stderr unless debugging) because the calling process might have set them up as
469 pipes and be waiting for them to close before it waits for the submission
470 process to terminate. If they aren't closed, they hold up the calling process
471 until the initial delivery process finishes, which is not what we want.
473 Exception: We do want it for synchronous delivery!
475 And notwithstanding all the above, if D_resolver is set, implying resolver
476 debugging, leave stdout open, because that's where the resolver writes its
479 When we close stderr (which implies we've also closed stdout), we also get rid
480 of any controlling terminal.
492 tls_close(FALSE); /* Shut down the TLS library */
494 (void)close(fileno(smtp_in));
495 (void)close(fileno(smtp_out));
500 (void)close(0); /* stdin */
501 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
502 if (debug_selector == 0) /* stderr */
504 if (!synchronous_delivery)
517 /*************************************************
519 *************************************************/
521 /* This function sets a new uid and gid permanently, optionally calling
522 initgroups() to set auxiliary groups. There are some special cases when running
523 Exim in unprivileged modes. In these situations the effective uid will not be
524 root; if we already have the right effective uid/gid, and don't need to
525 initialize any groups, leave things as they are.
530 igflag TRUE if initgroups() wanted
531 msg text to use in debugging output and failure log
533 Returns: nothing; bombs out on failure
537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
539 uid_t euid = geteuid();
540 gid_t egid = getegid();
542 if (euid == root_uid || euid != uid || egid != gid || igflag)
544 /* At least one OS returns +1 for initgroups failure, so just check for
549 struct passwd *pw = getpwuid(uid);
552 if (initgroups(pw->pw_name, gid) != 0)
553 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
554 (long int)uid, strerror(errno));
556 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
557 "no passwd entry for uid=%ld", (long int)uid);
560 if (setgid(gid) < 0 || setuid(uid) < 0)
562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
563 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
567 /* Debugging output included uid/gid and all groups */
572 gid_t group_list[NGROUPS_MAX];
573 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
574 (long int)geteuid(), (long int)getegid(), (long int)getpid());
575 group_count = getgroups(NGROUPS_MAX, group_list);
576 debug_printf(" auxiliary group list:");
580 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
582 else debug_printf(" <none>");
590 /*************************************************
592 *************************************************/
594 /* Exim exits via this function so that it always clears up any open
600 Returns: does not return
608 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
609 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
616 /*************************************************
617 * Extract port from host address *
618 *************************************************/
620 /* Called to extract the port from the values given to -oMa and -oMi.
621 It also checks the syntax of the address, and terminates it before the
622 port data when a port is extracted.
625 address the address, with possible port on the end
627 Returns: the port, or zero if there isn't one
628 bombs out on a syntax error
632 check_port(uschar *address)
634 int port = host_address_extract_port(address);
635 if (string_is_ip_address(address, NULL) == 0)
637 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
645 /*************************************************
646 * Test/verify an address *
647 *************************************************/
649 /* This function is called by the -bv and -bt code. It extracts a working
650 address from a full RFC 822 address. This isn't really necessary per se, but it
651 has the effect of collapsing source routes.
655 flags flag bits for verify_address()
656 exit_value to be set for failures
662 test_address(uschar *s, int flags, int *exit_value)
664 int start, end, domain;
665 uschar *parse_error = NULL;
666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
670 fprintf(stdout, "syntax error: %s\n", parse_error);
675 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
676 -1, -1, NULL, NULL, NULL);
677 if (rc == FAIL) *exit_value = 2;
678 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
684 /*************************************************
685 * Show supported features *
686 *************************************************/
688 /* This function is called for -bV and for -d to output the optional features
689 of the current Exim binary.
691 Arguments: a FILE for printing
696 show_whats_supported(FILE *f)
698 #ifdef DB_VERSION_STRING
699 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
700 #elif defined(BTREEVERSION) && defined(HASHVERSION)
702 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
704 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
706 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
707 fprintf(f, "Probably ndbm\n");
708 #elif defined(USE_TDB)
709 fprintf(f, "Using tdb\n");
712 fprintf(f, "Probably GDBM (native mode)\n");
714 fprintf(f, "Probably GDBM (compatibility mode)\n");
718 fprintf(f, "Support for:");
719 #ifdef SUPPORT_CRYPTEQ
720 fprintf(f, " crypteq");
723 fprintf(f, " iconv()");
728 #ifdef HAVE_SETCLASSRESOURCES
729 fprintf(f, " use_setclassresources");
738 fprintf(f, " Expand_dlfunc");
740 #ifdef USE_TCP_WRAPPERS
741 fprintf(f, " TCPwrappers");
745 fprintf(f, " GnuTLS");
747 fprintf(f, " OpenSSL");
750 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
751 fprintf(f, " translate_ip_address");
753 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
754 fprintf(f, " move_frozen_messages");
756 #ifdef WITH_CONTENT_SCAN
757 fprintf(f, " Content_Scanning");
762 #ifdef WITH_OLD_DEMIME
763 fprintf(f, " Old_Demime");
765 #ifdef EXPERIMENTAL_SPF
766 fprintf(f, " Experimental_SPF");
768 #ifdef EXPERIMENTAL_SRS
769 fprintf(f, " Experimental_SRS");
771 #ifdef EXPERIMENTAL_BRIGHTMAIL
772 fprintf(f, " Experimental_Brightmail");
774 #ifdef EXPERIMENTAL_DCC
775 fprintf(f, " Experimental_DCC");
779 fprintf(f, "Lookups:");
780 #ifdef LOOKUP_LSEARCH
781 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
787 fprintf(f, " dbm dbmnz");
790 fprintf(f, " dnsdb");
792 #ifdef LOOKUP_DSEARCH
793 fprintf(f, " dsearch");
796 fprintf(f, " ibase");
799 fprintf(f, " ldap ldapdn ldapm");
802 fprintf(f, " mysql");
805 fprintf(f, " nis nis0");
807 #ifdef LOOKUP_NISPLUS
808 fprintf(f, " nisplus");
811 fprintf(f, " oracle");
814 fprintf(f, " passwd");
817 fprintf(f, " pgsql");
820 fprintf(f, " sqlite");
823 fprintf(f, " testdb");
826 fprintf(f, " whoson");
830 fprintf(f, "Authenticators:");
832 fprintf(f, " cram_md5");
834 #ifdef AUTH_CYRUS_SASL
835 fprintf(f, " cyrus_sasl");
838 fprintf(f, " dovecot");
840 #ifdef AUTH_PLAINTEXT
841 fprintf(f, " plaintext");
848 fprintf(f, "Routers:");
850 fprintf(f, " accept");
852 #ifdef ROUTER_DNSLOOKUP
853 fprintf(f, " dnslookup");
855 #ifdef ROUTER_IPLITERAL
856 fprintf(f, " ipliteral");
858 #ifdef ROUTER_IPLOOKUP
859 fprintf(f, " iplookup");
861 #ifdef ROUTER_MANUALROUTE
862 fprintf(f, " manualroute");
864 #ifdef ROUTER_QUERYPROGRAM
865 fprintf(f, " queryprogram");
867 #ifdef ROUTER_REDIRECT
868 fprintf(f, " redirect");
872 fprintf(f, "Transports:");
873 #ifdef TRANSPORT_APPENDFILE
874 fprintf(f, " appendfile");
875 #ifdef SUPPORT_MAILDIR
876 fprintf(f, "/maildir");
878 #ifdef SUPPORT_MAILSTORE
879 fprintf(f, "/mailstore");
885 #ifdef TRANSPORT_AUTOREPLY
886 fprintf(f, " autoreply");
888 #ifdef TRANSPORT_LMTP
891 #ifdef TRANSPORT_PIPE
894 #ifdef TRANSPORT_SMTP
899 if (fixed_never_users[0] > 0)
902 fprintf(f, "Fixed never_users: ");
903 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
904 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
905 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
908 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
910 /* This runtime check is to help diagnose library linkage mismatches which
911 result in segfaults and the like; as such, it's left until the end,
912 just in case. There will still be a "Configuration file is" line still to
915 tls_version_report(f);
922 /*************************************************
923 * Quote a local part *
924 *************************************************/
926 /* This function is used when a sender address or a From: or Sender: header
927 line is being created from the caller's login, or from an authenticated_id. It
928 applies appropriate quoting rules for a local part.
930 Argument: the local part
931 Returns: the local part, quoted if necessary
935 local_part_quote(uschar *lpart)
937 BOOL needs_quote = FALSE;
942 for (t = lpart; !needs_quote && *t != 0; t++)
944 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
945 (*t != '.' || t == lpart || t[1] == 0);
948 if (!needs_quote) return lpart;
951 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
955 uschar *nq = US Ustrpbrk(lpart, "\\\"");
958 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
961 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
962 yield = string_cat(yield, &size, &ptr, US"\\", 1);
963 yield = string_cat(yield, &size, &ptr, nq, 1);
967 yield = string_cat(yield, &size, &ptr, US"\"", 1);
975 /*************************************************
976 * Load readline() functions *
977 *************************************************/
979 /* This function is called from testing executions that read data from stdin,
980 but only when running as the calling user. Currently, only -be does this. The
981 function loads the readline() function library and passes back the functions.
982 On some systems, it needs the curses library, so load that too, but try without
983 it if loading fails. All this functionality has to be requested at build time.
986 fn_readline_ptr pointer to where to put the readline pointer
987 fn_addhist_ptr pointer to where to put the addhistory function
989 Returns: the dlopen handle or NULL on failure
993 set_readline(char * (**fn_readline_ptr)(char *),
994 char * (**fn_addhist_ptr)(char *))
997 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
999 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1000 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1002 if (dlhandle != NULL)
1004 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1005 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1009 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1018 /*************************************************
1019 * Get a line from stdin for testing things *
1020 *************************************************/
1022 /* This function is called when running tests that can take a number of lines
1023 of input (for example, -be and -bt). It handles continuations and trailing
1024 spaces. And prompting and a blank line output on eof. If readline() is in use,
1025 the arguments are non-NULL and provide the relevant functions.
1028 fn_readline readline function or NULL
1029 fn_addhist addhist function or NULL
1031 Returns: pointer to dynamic memory, or NULL at end of file
1035 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1040 uschar *yield = NULL;
1042 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1046 uschar buffer[1024];
1050 char *readline_line = NULL;
1051 if (fn_readline != NULL)
1053 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1054 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1055 p = US readline_line;
1060 /* readline() not in use */
1063 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1067 /* Handle the line */
1069 ss = p + (int)Ustrlen(p);
1070 while (ss > p && isspace(ss[-1])) ss--;
1074 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1077 yield = string_cat(yield, &size, &ptr, p, ss - p);
1080 if (fn_readline != NULL) free(readline_line);
1083 if (ss == p || yield[ptr-1] != '\\')
1091 if (yield == NULL) printf("\n");
1097 /*************************************************
1098 * Output usage information for the program *
1099 *************************************************/
1101 /* This function is called when there are no recipients
1102 or a specific --help argument was added.
1105 progname information on what name we were called by
1107 Returns: DOES NOT RETURN
1111 exim_usage(uschar *progname)
1114 /* Handle specific program invocation varients */
1115 if (Ustrcmp(progname, US"-mailq") == 0)
1118 "mailq - list the contents of the mail queue\n\n"
1119 "For a list of options, see the Exim documentation.\n");
1123 /* Generic usage - we output this whatever happens */
1125 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1126 "not directly from a shell command line. Options and/or arguments control\n"
1127 "what it does when called. For a list of options, see the Exim documentation.\n");
1134 /*************************************************
1135 * Entry point and high-level code *
1136 *************************************************/
1138 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1139 the appropriate action. All the necessary functions are present in the one
1140 binary. I originally thought one should split it up, but it turns out that so
1141 much of the apparatus is needed in each chunk that one might as well just have
1142 it all available all the time, which then makes the coding easier as well.
1145 argc count of entries in argv
1146 argv argument strings, with argv[0] being the program name
1148 Returns: EXIT_SUCCESS if terminated successfully
1149 EXIT_FAILURE otherwise, except when a message has been sent
1150 to the sender, and -oee was given
1154 main(int argc, char **cargv)
1156 uschar **argv = USS cargv;
1157 int arg_receive_timeout = -1;
1158 int arg_smtp_receive_timeout = -1;
1159 int arg_error_handling = error_handling;
1160 int filter_sfd = -1;
1161 int filter_ufd = -1;
1164 int list_queue_option = 0;
1166 int msg_action_arg = -1;
1167 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1168 int queue_only_reason = 0;
1170 int perl_start_option = 0;
1172 int recipients_arg = argc;
1173 int sender_address_domain = 0;
1174 int test_retry_arg = -1;
1175 int test_rewrite_arg = -1;
1176 BOOL arg_queue_only = FALSE;
1177 BOOL bi_option = FALSE;
1178 BOOL checking = FALSE;
1179 BOOL count_queue = FALSE;
1180 BOOL expansion_test = FALSE;
1181 BOOL extract_recipients = FALSE;
1182 BOOL forced_delivery = FALSE;
1183 BOOL f_end_dot = FALSE;
1184 BOOL deliver_give_up = FALSE;
1185 BOOL list_queue = FALSE;
1186 BOOL list_options = FALSE;
1187 BOOL local_queue_only;
1189 BOOL one_msg_action = FALSE;
1190 BOOL queue_only_set = FALSE;
1191 BOOL receiving_message = TRUE;
1192 BOOL sender_ident_set = FALSE;
1193 BOOL session_local_queue_only;
1195 BOOL removed_privilege = FALSE;
1196 BOOL usage_wanted = FALSE;
1197 BOOL verify_address_mode = FALSE;
1198 BOOL verify_as_sender = FALSE;
1199 BOOL version_printed = FALSE;
1200 uschar *alias_arg = NULL;
1201 uschar *called_as = US"";
1202 uschar *start_queue_run_id = NULL;
1203 uschar *stop_queue_run_id = NULL;
1204 uschar *expansion_test_message = NULL;
1205 uschar *ftest_domain = NULL;
1206 uschar *ftest_localpart = NULL;
1207 uschar *ftest_prefix = NULL;
1208 uschar *ftest_suffix = NULL;
1209 uschar *malware_test_file = NULL;
1210 uschar *real_sender_address;
1211 uschar *originator_home = US"/";
1215 struct stat statbuf;
1216 pid_t passed_qr_pid = (pid_t)0;
1217 int passed_qr_pipe = -1;
1218 gid_t group_list[NGROUPS_MAX];
1220 /* Possible options for -R and -S */
1222 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1224 /* Need to define this in case we need to change the environment in order
1225 to get rid of a bogus time zone. We have to make it char rather than uschar
1226 because some OS define it in /usr/include/unistd.h. */
1228 extern char **environ;
1230 /* If the Exim user and/or group and/or the configuration file owner/group were
1231 defined by ref:name at build time, we must now find the actual uid/gid values.
1232 This is a feature to make the lives of binary distributors easier. */
1234 #ifdef EXIM_USERNAME
1235 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1237 exim_gid = pw->pw_gid;
1241 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1247 #ifdef EXIM_GROUPNAME
1248 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1250 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1256 #ifdef CONFIGURE_OWNERNAME
1257 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1259 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1260 CONFIGURE_OWNERNAME);
1265 #ifdef CONFIGURE_GROUPNAME
1266 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1268 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1269 CONFIGURE_GROUPNAME);
1274 /* In the Cygwin environment, some initialization needs doing. It is fudged
1275 in by means of this macro. */
1281 /* Check a field which is patched when we are running Exim within its
1282 testing harness; do a fast initial check, and then the whole thing. */
1284 running_in_test_harness =
1285 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1287 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1288 at the start of a program; however, it seems that some environments do not
1289 follow this. A "strange" locale can affect the formatting of timestamps, so we
1292 setlocale(LC_ALL, "C");
1294 /* Set up the default handler for timing using alarm(). */
1296 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1298 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1299 because store_malloc writes a log entry on failure. */
1301 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1302 if (log_buffer == NULL)
1304 fprintf(stderr, "exim: failed to get store for log buffer\n");
1308 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1309 NULL when the daemon is run and the file is closed. We have to use this
1310 indirection, because some systems don't allow writing to the variable "stderr".
1313 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1315 /* Arrange for the PCRE regex library to use our store functions. Note that
1316 the normal calls are actually macros that add additional arguments for
1317 debugging purposes so we have to assign specially constructed functions here.
1318 The default is to use store in the stacking pool, but this is overridden in the
1319 regex_must_compile() function. */
1321 pcre_malloc = function_store_get;
1322 pcre_free = function_dummy_free;
1324 /* Ensure there is a big buffer for temporary use in several places. It is put
1325 in malloc store so that it can be freed for enlargement if necessary. */
1327 big_buffer = store_malloc(big_buffer_size);
1329 /* Set up the handler for the data request signal, and set the initial
1330 descriptive text. */
1332 set_process_info("initializing");
1333 os_restarting_signal(SIGUSR1, usr1_handler);
1335 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1336 in the daemon code. For the rest of Exim's uses, we ignore it. */
1338 signal(SIGHUP, SIG_IGN);
1340 /* We don't want to die on pipe errors as the code is written to handle
1341 the write error instead. */
1343 signal(SIGPIPE, SIG_IGN);
1345 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1346 set to SIG_IGN. This causes subprocesses that complete before the parent
1347 process waits for them not to hang around, so when Exim calls wait(), nothing
1348 is there. The wait() code has been made robust against this, but let's ensure
1349 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1350 ending status. We use sigaction rather than plain signal() on those OS where
1351 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1352 problem on AIX with this.) */
1356 struct sigaction act;
1357 act.sa_handler = SIG_DFL;
1358 sigemptyset(&(act.sa_mask));
1360 sigaction(SIGCHLD, &act, NULL);
1363 signal(SIGCHLD, SIG_DFL);
1366 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1371 /* Set up the version number. Set up the leading 'E' for the external form of
1372 message ids, set the pointer to the internal form, and initialize it to
1373 indicate no message being processed. */
1376 message_id_option[0] = '-';
1377 message_id_external = message_id_option + 1;
1378 message_id_external[0] = 'E';
1379 message_id = message_id_external + 1;
1382 /* Set the umask to zero so that any files Exim creates using open() are
1383 created with the modes that it specifies. NOTE: Files created with fopen() have
1384 a problem, which was not recognized till rather late (February 2006). With this
1385 umask, such files will be world writeable. (They are all content scanning files
1386 in the spool directory, which isn't world-accessible, so this is not a
1387 disaster, but it's untidy.) I don't want to change this overall setting,
1388 however, because it will interact badly with the open() calls. Instead, there's
1389 now a function called modefopen() that fiddles with the umask while calling
1394 /* Precompile the regular expression for matching a message id. Keep this in
1395 step with the code that generates ids in the accept.c module. We need to do
1396 this here, because the -M options check their arguments for syntactic validity
1397 using mac_ismsgid, which uses this. */
1400 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1402 /* Precompile the regular expression that is used for matching an SMTP error
1403 code, possibly extended, at the start of an error message. Note that the
1404 terminating whitespace character is included. */
1407 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1410 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1411 this seems to be a generally accepted convention, since one finds symbolic
1412 links called "mailq" in standard OS configurations. */
1414 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1415 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1418 receiving_message = FALSE;
1419 called_as = US"-mailq";
1422 /* If the program is called as "rmail" treat it as equivalent to
1423 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1424 i.e. preventing a single dot on a line from terminating the message, and
1425 returning with zero return code, even in cases of error (provided an error
1426 message has been sent). */
1428 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1429 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1432 called_as = US"-rmail";
1433 errors_sender_rc = EXIT_SUCCESS;
1436 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1437 this is a smail convention. */
1439 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1440 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1442 smtp_input = smtp_batched_input = TRUE;
1443 called_as = US"-rsmtp";
1446 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1447 this is a smail convention. */
1449 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1450 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1453 receiving_message = FALSE;
1454 called_as = US"-runq";
1457 /* If the program is called as "newaliases" treat it as equivalent to
1458 "exim -bi"; this is a sendmail convention. */
1460 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1461 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1464 receiving_message = FALSE;
1465 called_as = US"-newaliases";
1468 /* Save the original effective uid for a couple of uses later. It should
1469 normally be root, but in some esoteric environments it may not be. */
1471 original_euid = geteuid();
1473 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1474 to be the same as the real ones. This makes a difference only if Exim is setuid
1475 (or setgid) to something other than root, which could be the case in some
1476 special configurations. */
1478 real_uid = getuid();
1479 real_gid = getgid();
1481 if (real_uid == root_uid)
1487 /* If neither the original real uid nor the original euid was root, Exim is
1488 running in an unprivileged state. */
1490 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1492 /* If the first argument is --help, set usage_wanted and pretend there
1493 are no arguments. This will cause a brief message to be given. We do
1494 the message generation downstream so we can pick up how we were invoked */
1496 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0)
1499 usage_wanted = TRUE;
1502 /* Scan the program's arguments. Some can be dealt with right away; others are
1503 simply recorded for checking and handling afterwards. Do a high-level switch
1504 on the second character (the one after '-'), to save some effort. */
1506 for (i = 1; i < argc; i++)
1508 BOOL badarg = FALSE;
1509 uschar *arg = argv[i];
1513 /* An argument not starting with '-' is the start of a recipients list;
1514 break out of the options-scanning loop. */
1522 /* An option consistion of -- terminates the options */
1524 if (Ustrcmp(arg, "--") == 0)
1526 recipients_arg = i + 1;
1530 /* Handle flagged options */
1532 switchchar = arg[1];
1535 /* Make all -ex options synonymous with -oex arguments, since that
1536 is assumed by various callers. Also make -qR options synonymous with -R
1537 options, as that seems to be required as well. Allow for -qqR too, and
1538 the same for -S options. */
1540 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1541 Ustrncmp(arg+1, "qR", 2) == 0 ||
1542 Ustrncmp(arg+1, "qS", 2) == 0)
1544 switchchar = arg[2];
1547 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1549 switchchar = arg[3];
1551 queue_2stage = TRUE;
1554 /* Make -r synonymous with -f, since it is a documented alias */
1556 else if (arg[1] == 'r') switchchar = 'f';
1558 /* Make -ov synonymous with -v */
1560 else if (Ustrcmp(arg, "-ov") == 0)
1566 /* High-level switch on active initial letter */
1570 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1571 so has no need of it. */
1574 if (*argrest == 0) i++; /* Skip over the type */
1579 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1581 /* -bd: Run in daemon mode, awaiting SMTP connections.
1582 -bdf: Ditto, but in the foreground.
1585 if (*argrest == 'd')
1587 daemon_listen = TRUE;
1588 if (*(++argrest) == 'f') background_daemon = FALSE;
1589 else if (*argrest != 0) { badarg = TRUE; break; }
1592 /* -be: Run in expansion test mode
1593 -bem: Ditto, but read a message from a file first
1596 else if (*argrest == 'e')
1598 expansion_test = checking = TRUE;
1599 if (argrest[1] == 'm')
1601 if (++i >= argc) { badarg = TRUE; break; }
1602 expansion_test_message = argv[i];
1605 if (argrest[1] != 0) { badarg = TRUE; break; }
1608 /* -bF: Run system filter test */
1610 else if (*argrest == 'F')
1612 filter_test |= FTEST_SYSTEM;
1613 if (*(++argrest) != 0) { badarg = TRUE; break; }
1614 if (++i < argc) filter_test_sfile = argv[i]; else
1616 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1621 /* -bf: Run user filter test
1622 -bfd: Set domain for filter testing
1623 -bfl: Set local part for filter testing
1624 -bfp: Set prefix for filter testing
1625 -bfs: Set suffix for filter testing
1628 else if (*argrest == 'f')
1630 if (*(++argrest) == 0)
1632 filter_test |= FTEST_USER;
1633 if (++i < argc) filter_test_ufile = argv[i]; else
1635 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1643 fprintf(stderr, "exim: string expected after %s\n", arg);
1646 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1647 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1648 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1649 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1650 else { badarg = TRUE; break; }
1654 /* -bh: Host checking - an IP address must follow. */
1656 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1658 if (++i >= argc) { badarg = TRUE; break; }
1659 sender_host_address = argv[i];
1660 host_checking = checking = log_testing_mode = TRUE;
1661 host_checking_callout = argrest[1] == 'c';
1664 /* -bi: This option is used by sendmail to initialize *the* alias file,
1665 though it has the -oA option to specify a different file. Exim has no
1666 concept of *the* alias file, but since Sun's YP make script calls
1667 sendmail this way, some support must be provided. */
1669 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1671 /* -bm: Accept and deliver message - the default option. Reinstate
1672 receiving_message, which got turned off for all -b options. */
1674 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1676 /* -bmalware: test the filename given for malware */
1678 else if (Ustrcmp(argrest, "malware") == 0)
1680 if (++i >= argc) { badarg = TRUE; break; }
1681 malware_test_file = argv[i];
1684 /* -bnq: For locally originating messages, do not qualify unqualified
1685 addresses. In the envelope, this causes errors; in header lines they
1688 else if (Ustrcmp(argrest, "nq") == 0)
1690 allow_unqualified_sender = FALSE;
1691 allow_unqualified_recipient = FALSE;
1694 /* -bpxx: List the contents of the mail queue, in various forms. If
1695 the option is -bpc, just a queue count is needed. Otherwise, if the
1696 first letter after p is r, then order is random. */
1698 else if (*argrest == 'p')
1700 if (*(++argrest) == 'c')
1703 if (*(++argrest) != 0) badarg = TRUE;
1707 if (*argrest == 'r')
1709 list_queue_option = 8;
1712 else list_queue_option = 0;
1716 /* -bp: List the contents of the mail queue, top-level only */
1718 if (*argrest == 0) {}
1720 /* -bpu: List the contents of the mail queue, top-level undelivered */
1722 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1724 /* -bpa: List the contents of the mail queue, including all delivered */
1726 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1728 /* Unknown after -bp[r] */
1738 /* -bP: List the configuration variables given as the address list.
1739 Force -v, so configuration errors get displayed. */
1741 else if (Ustrcmp(argrest, "P") == 0)
1743 list_options = TRUE;
1744 debug_selector |= D_v;
1745 debug_file = stderr;
1748 /* -brt: Test retry configuration lookup */
1750 else if (Ustrcmp(argrest, "rt") == 0)
1752 test_retry_arg = i + 1;
1756 /* -brw: Test rewrite configuration */
1758 else if (Ustrcmp(argrest, "rw") == 0)
1760 test_rewrite_arg = i + 1;
1764 /* -bS: Read SMTP commands on standard input, but produce no replies -
1765 all errors are reported by sending messages. */
1767 else if (Ustrcmp(argrest, "S") == 0)
1768 smtp_input = smtp_batched_input = receiving_message = TRUE;
1770 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1771 on standard output. */
1773 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1775 /* -bt: address testing mode */
1777 else if (Ustrcmp(argrest, "t") == 0)
1778 address_test_mode = checking = log_testing_mode = TRUE;
1780 /* -bv: verify addresses */
1782 else if (Ustrcmp(argrest, "v") == 0)
1783 verify_address_mode = checking = log_testing_mode = TRUE;
1785 /* -bvs: verify sender addresses */
1787 else if (Ustrcmp(argrest, "vs") == 0)
1789 verify_address_mode = checking = log_testing_mode = TRUE;
1790 verify_as_sender = TRUE;
1793 /* -bV: Print version string and support details */
1795 else if (Ustrcmp(argrest, "V") == 0)
1797 printf("Exim version %s #%s built %s\n", version_string,
1798 version_cnumber, version_date);
1799 printf("%s\n", CS version_copyright);
1800 version_printed = TRUE;
1801 show_whats_supported(stdout);
1808 /* -C: change configuration file list; ignore if it isn't really
1809 a change! Enforce a prefix check if required. */
1814 if(++i < argc) argrest = argv[i]; else
1815 { badarg = TRUE; break; }
1817 if (Ustrcmp(config_main_filelist, argrest) != 0)
1819 #ifdef ALT_CONFIG_PREFIX
1821 int len = Ustrlen(ALT_CONFIG_PREFIX);
1822 uschar *list = argrest;
1824 while((filename = string_nextinlist(&list, &sep, big_buffer,
1825 big_buffer_size)) != NULL)
1827 if ((Ustrlen(filename) < len ||
1828 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1829 Ustrstr(filename, "/../") != NULL) &&
1830 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1832 fprintf(stderr, "-C Permission denied\n");
1838 config_main_filelist = argrest;
1839 config_changed = TRUE;
1844 /* -D: set up a macro definition */
1847 #ifdef DISABLE_D_OPTION
1848 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1853 macro_item *mlast = NULL;
1856 uschar *s = argrest;
1858 while (isspace(*s)) s++;
1860 if (*s < 'A' || *s > 'Z')
1862 fprintf(stderr, "exim: macro name set by -D must start with "
1863 "an upper case letter\n");
1867 while (isalnum(*s) || *s == '_')
1869 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1873 if (ptr == 0) { badarg = TRUE; break; }
1874 while (isspace(*s)) s++;
1877 if (*s++ != '=') { badarg = TRUE; break; }
1878 while (isspace(*s)) s++;
1881 for (m = macros; m != NULL; m = m->next)
1883 if (Ustrcmp(m->name, name) == 0)
1885 fprintf(stderr, "exim: duplicated -D in command line\n");
1891 m = store_get(sizeof(macro_item) + Ustrlen(name));
1893 m->command_line = TRUE;
1894 if (mlast == NULL) macros = m; else mlast->next = m;
1895 Ustrcpy(m->name, name);
1896 m->replacement = string_copy(s);
1898 if (clmacro_count >= MAX_CLMACROS)
1900 fprintf(stderr, "exim: too many -D options on command line\n");
1903 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1909 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1910 The latter is now a no-op, retained for compatibility only. If -dd is used,
1911 debugging subprocesses of the daemon is disabled. */
1914 if (Ustrcmp(argrest, "ropcr") == 0)
1916 /* drop_cr = TRUE; */
1919 /* Use an intermediate variable so that we don't set debugging while
1920 decoding the debugging bits. */
1924 unsigned int selector = D_default;
1927 if (*argrest == 'd')
1929 debug_daemon = TRUE;
1933 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1934 debug_options_count, US"debug", 0);
1935 debug_selector = selector;
1940 /* -E: This is a local error message. This option is not intended for
1941 external use at all, but is not restricted to trusted callers because it
1942 does no harm (just suppresses certain error messages) and if Exim is run
1943 not setuid root it won't always be trusted when it generates error
1944 messages using this option. If there is a message id following -E, point
1945 message_reference at it, for logging. */
1948 local_error_message = TRUE;
1949 if (mac_ismsgid(argrest)) message_reference = argrest;
1953 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1954 option, so it looks as if historically the -oex options are also callable
1955 without the leading -o. So we have to accept them. Before the switch,
1956 anything starting -oe has been converted to -e. Exim does not support all
1957 of the sendmail error options. */
1960 if (Ustrcmp(argrest, "e") == 0)
1962 arg_error_handling = ERRORS_SENDER;
1963 errors_sender_rc = EXIT_SUCCESS;
1965 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1966 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1967 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1968 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1973 /* -F: Set sender's full name, used instead of the gecos entry from
1974 the password file. Since users can usually alter their gecos entries,
1975 there's no security involved in using this instead. The data can follow
1976 the -F or be in the next argument. */
1981 if(++i < argc) argrest = argv[i]; else
1982 { badarg = TRUE; break; }
1984 originator_name = argrest;
1985 sender_name_forced = TRUE;
1989 /* -f: Set sender's address - this value is only actually used if Exim is
1990 run by a trusted user, or if untrusted_set_sender is set and matches the
1991 address, except that the null address can always be set by any user. The
1992 test for this happens later, when the value given here is ignored when not
1993 permitted. For an untrusted user, the actual sender is still put in Sender:
1994 if it doesn't match the From: header (unless no_local_from_check is set).
1995 The data can follow the -f or be in the next argument. The -r switch is an
1996 obsolete form of -f but since there appear to be programs out there that
1997 use anything that sendmail has ever supported, better accept it - the
1998 synonymizing is done before the switch above.
2000 At this stage, we must allow domain literal addresses, because we don't
2001 know what the setting of allow_domain_literals is yet. Ditto for trailing
2002 dots and strip_trailing_dot. */
2010 if (i+1 < argc) argrest = argv[++i]; else
2011 { badarg = TRUE; break; }
2015 sender_address = string_sprintf(""); /* Ensure writeable memory */
2019 uschar *temp = argrest + Ustrlen(argrest) - 1;
2020 while (temp >= argrest && isspace(*temp)) temp--;
2021 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2022 allow_domain_literals = TRUE;
2023 strip_trailing_dot = TRUE;
2024 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2025 &sender_address_domain, TRUE);
2026 allow_domain_literals = FALSE;
2027 strip_trailing_dot = FALSE;
2028 if (sender_address == NULL)
2030 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2031 return EXIT_FAILURE;
2034 sender_address_forced = TRUE;
2038 /* This is some Sendmail thing which can be ignored */
2043 /* -h: Set the hop count for an incoming message. Exim does not currently
2044 support this; it always computes it by counting the Received: headers.
2045 To put it in will require a change to the spool header file format. */
2050 if(++i < argc) argrest = argv[i]; else
2051 { badarg = TRUE; break; }
2053 if (!isdigit(*argrest)) badarg = TRUE;
2057 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2058 not to be documented for sendmail but mailx (at least) uses it) */
2061 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2066 receiving_message = FALSE;
2068 /* -MC: continue delivery of another message via an existing open
2069 file descriptor. This option is used for an internal call by the
2070 smtp transport when there is a pending message waiting to go to an
2071 address to which it has got a connection. Five subsequent arguments are
2072 required: transport name, host name, IP address, sequence number, and
2073 message_id. Transports may decline to create new processes if the sequence
2074 number gets too big. The channel is stdin. This (-MC) must be the last
2075 argument. There's a subsequent check that the real-uid is privileged.
2077 If we are running in the test harness. delay for a bit, to let the process
2078 that set this one up complete. This makes for repeatability of the logging,
2081 if (Ustrcmp(argrest, "C") == 0)
2083 union sockaddr_46 interface_sock;
2084 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2088 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2089 return EXIT_FAILURE;
2092 if (msg_action_arg >= 0)
2094 fprintf(stderr, "exim: incompatible arguments\n");
2095 return EXIT_FAILURE;
2098 continue_transport = argv[++i];
2099 continue_hostname = argv[++i];
2100 continue_host_address = argv[++i];
2101 continue_sequence = Uatoi(argv[++i]);
2102 msg_action = MSG_DELIVER;
2103 msg_action_arg = ++i;
2104 forced_delivery = TRUE;
2105 queue_run_pid = passed_qr_pid;
2106 queue_run_pipe = passed_qr_pipe;
2108 if (!mac_ismsgid(argv[i]))
2110 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2112 return EXIT_FAILURE;
2115 /* Set up $sending_ip_address and $sending_port */
2117 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2119 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2123 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2125 return EXIT_FAILURE;
2128 if (running_in_test_harness) millisleep(500);
2132 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2133 precedes -MC (see above). The flag indicates that the host to which
2134 Exim is connected has accepted an AUTH sequence. */
2136 else if (Ustrcmp(argrest, "CA") == 0)
2138 smtp_authenticated = TRUE;
2142 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2143 it preceded -MC (see above) */
2145 else if (Ustrcmp(argrest, "CP") == 0)
2147 smtp_use_pipelining = TRUE;
2151 /* -MCQ: pass on the pid of the queue-running process that started
2152 this chain of deliveries and the fd of its synchronizing pipe; this
2153 is useful only when it precedes -MC (see above) */
2155 else if (Ustrcmp(argrest, "CQ") == 0)
2157 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2159 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2164 /* -MCS: set the smtp_use_size flag; this is useful only when it
2165 precedes -MC (see above) */
2167 else if (Ustrcmp(argrest, "CS") == 0)
2169 smtp_use_size = TRUE;
2173 /* -MCT: set the tls_offered flag; this is useful only when it
2174 precedes -MC (see above). The flag indicates that the host to which
2175 Exim is connected has offered TLS support. */
2178 else if (Ustrcmp(argrest, "CT") == 0)
2185 /* -M[x]: various operations on the following list of message ids:
2186 -M deliver the messages, ignoring next retry times and thawing
2187 -Mc deliver the messages, checking next retry times, no thawing
2188 -Mf freeze the messages
2189 -Mg give up on the messages
2190 -Mt thaw the messages
2191 -Mrm remove the messages
2192 In the above cases, this must be the last option. There are also the
2193 following options which are followed by a single message id, and which
2194 act on that message. Some of them use the "recipient" addresses as well.
2195 -Mar add recipient(s)
2196 -Mmad mark all recipients delivered
2197 -Mmd mark recipients(s) delivered
2199 -Mset load a message for use with -be
2201 -Mvc show copy (of whole message, in RFC 2822 format)
2206 else if (*argrest == 0)
2208 msg_action = MSG_DELIVER;
2209 forced_delivery = deliver_force_thaw = TRUE;
2211 else if (Ustrcmp(argrest, "ar") == 0)
2213 msg_action = MSG_ADD_RECIPIENT;
2214 one_msg_action = TRUE;
2216 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2217 else if (Ustrcmp(argrest, "es") == 0)
2219 msg_action = MSG_EDIT_SENDER;
2220 one_msg_action = TRUE;
2222 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2223 else if (Ustrcmp(argrest, "g") == 0)
2225 msg_action = MSG_DELIVER;
2226 deliver_give_up = TRUE;
2228 else if (Ustrcmp(argrest, "mad") == 0)
2230 msg_action = MSG_MARK_ALL_DELIVERED;
2232 else if (Ustrcmp(argrest, "md") == 0)
2234 msg_action = MSG_MARK_DELIVERED;
2235 one_msg_action = TRUE;
2237 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2238 else if (Ustrcmp(argrest, "set") == 0)
2240 msg_action = MSG_LOAD;
2241 one_msg_action = TRUE;
2243 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2244 else if (Ustrcmp(argrest, "vb") == 0)
2246 msg_action = MSG_SHOW_BODY;
2247 one_msg_action = TRUE;
2249 else if (Ustrcmp(argrest, "vc") == 0)
2251 msg_action = MSG_SHOW_COPY;
2252 one_msg_action = TRUE;
2254 else if (Ustrcmp(argrest, "vh") == 0)
2256 msg_action = MSG_SHOW_HEADER;
2257 one_msg_action = TRUE;
2259 else if (Ustrcmp(argrest, "vl") == 0)
2261 msg_action = MSG_SHOW_LOG;
2262 one_msg_action = TRUE;
2264 else { badarg = TRUE; break; }
2266 /* All the -Mxx options require at least one message id. */
2268 msg_action_arg = i + 1;
2269 if (msg_action_arg >= argc)
2271 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2272 return EXIT_FAILURE;
2275 /* Some require only message ids to follow */
2277 if (!one_msg_action)
2280 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2282 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2284 return EXIT_FAILURE;
2286 goto END_ARG; /* Remaining args are ids */
2289 /* Others require only one message id, possibly followed by addresses,
2290 which will be handled as normal arguments. */
2294 if (!mac_ismsgid(argv[msg_action_arg]))
2296 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2297 argv[msg_action_arg], arg);
2298 return EXIT_FAILURE;
2305 /* Some programs seem to call the -om option without the leading o;
2306 for sendmail it askes for "me too". Exim always does this. */
2309 if (*argrest != 0) badarg = TRUE;
2313 /* -N: don't do delivery - a debugging option that stops transports doing
2314 their thing. It implies debugging at the D_v level. */
2319 dont_deliver = TRUE;
2320 debug_selector |= D_v;
2321 debug_file = stderr;
2327 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2333 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2334 option to the specified value. This form uses long names. We need to handle
2335 -O option=value and -Ooption=value. */
2342 fprintf(stderr, "exim: string expected after -O\n");
2350 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2353 if (*argrest == 'A')
2355 alias_arg = argrest + 1;
2356 if (alias_arg[0] == 0)
2358 if (i+1 < argc) alias_arg = argv[++i]; else
2360 fprintf(stderr, "exim: string expected after -oA\n");
2366 /* -oB: Set a connection message max value for remote deliveries */
2368 else if (*argrest == 'B')
2370 uschar *p = argrest + 1;
2373 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2375 connection_max_messages = 1;
2384 fprintf(stderr, "exim: number expected after -oB\n");
2387 connection_max_messages = Uatoi(p);
2391 /* -odb: background delivery */
2393 else if (Ustrcmp(argrest, "db") == 0)
2395 synchronous_delivery = FALSE;
2396 arg_queue_only = FALSE;
2397 queue_only_set = TRUE;
2400 /* -odf: foreground delivery (smail-compatible option); same effect as
2401 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2404 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2406 synchronous_delivery = TRUE;
2407 arg_queue_only = FALSE;
2408 queue_only_set = TRUE;
2411 /* -odq: queue only */
2413 else if (Ustrcmp(argrest, "dq") == 0)
2415 synchronous_delivery = FALSE;
2416 arg_queue_only = TRUE;
2417 queue_only_set = TRUE;
2420 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2421 but no remote delivery */
2423 else if (Ustrcmp(argrest, "dqs") == 0)
2426 arg_queue_only = FALSE;
2427 queue_only_set = TRUE;
2430 /* -oex: Sendmail error flags. As these are also accepted without the
2431 leading -o prefix, for compatibility with vacation and other callers,
2432 they are handled with -e above. */
2434 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2435 -oitrue: Another sendmail syntax for the same */
2437 else if (Ustrcmp(argrest, "i") == 0 ||
2438 Ustrcmp(argrest, "itrue") == 0)
2441 /* -oM*: Set various characteristics for an incoming message; actually
2442 acted on for trusted callers only. */
2444 else if (*argrest == 'M')
2448 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2452 /* -oMa: Set sender host address */
2454 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2456 /* -oMaa: Set authenticator name */
2458 else if (Ustrcmp(argrest, "Maa") == 0)
2459 sender_host_authenticated = argv[++i];
2461 /* -oMas: setting authenticated sender */
2463 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2465 /* -oMai: setting authenticated id */
2467 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2469 /* -oMi: Set incoming interface address */
2471 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2473 /* -oMr: Received protocol */
2475 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2477 /* -oMs: Set sender host name */
2479 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2481 /* -oMt: Set sender ident */
2483 else if (Ustrcmp(argrest, "Mt") == 0)
2485 sender_ident_set = TRUE;
2486 sender_ident = argv[++i];
2489 /* Else a bad argument */
2498 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2499 seem to call this as -m (undocumented), so that is also accepted (see
2502 else if (Ustrcmp(argrest, "m") == 0) {}
2504 /* -oo: An ancient flag for old-style addresses which still seems to
2505 crop up in some calls (see in SCO). */
2507 else if (Ustrcmp(argrest, "o") == 0) {}
2509 /* -oP <name>: set pid file path for daemon */
2511 else if (Ustrcmp(argrest, "P") == 0)
2512 override_pid_file_path = argv[++i];
2514 /* -or <n>: set timeout for non-SMTP acceptance
2515 -os <n>: set timeout for SMTP acceptance */
2517 else if (*argrest == 'r' || *argrest == 's')
2519 int *tp = (*argrest == 'r')?
2520 &arg_receive_timeout : &arg_smtp_receive_timeout;
2521 if (argrest[1] == 0)
2523 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2525 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2528 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2533 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2535 else if (Ustrcmp(argrest, "X") == 0)
2536 override_local_interfaces = argv[++i];
2538 /* Unknown -o argument */
2544 /* -ps: force Perl startup; -pd force delayed Perl startup */
2548 if (*argrest == 's' && argrest[1] == 0)
2550 perl_start_option = 1;
2553 if (*argrest == 'd' && argrest[1] == 0)
2555 perl_start_option = -1;
2560 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2561 which sets the host protocol and host name */
2565 if (i+1 < argc) argrest = argv[++i]; else
2566 { badarg = TRUE; break; }
2571 uschar *hn = Ustrchr(argrest, ':');
2574 received_protocol = argrest;
2578 received_protocol = string_copyn(argrest, hn - argrest);
2579 sender_host_name = hn + 1;
2586 receiving_message = FALSE;
2587 if (queue_interval >= 0)
2589 fprintf(stderr, "exim: -q specified more than once\n");
2593 /* -qq...: Do queue runs in a 2-stage manner */
2595 if (*argrest == 'q')
2597 queue_2stage = TRUE;
2601 /* -qi...: Do only first (initial) deliveries */
2603 if (*argrest == 'i')
2605 queue_run_first_delivery = TRUE;
2609 /* -qf...: Run the queue, forcing deliveries
2610 -qff..: Ditto, forcing thawing as well */
2612 if (*argrest == 'f')
2614 queue_run_force = TRUE;
2615 if (*(++argrest) == 'f')
2617 deliver_force_thaw = TRUE;
2622 /* -q[f][f]l...: Run the queue only on local deliveries */
2624 if (*argrest == 'l')
2626 queue_run_local = TRUE;
2630 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2631 optionally starting from a given message id. */
2633 if (*argrest == 0 &&
2634 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2637 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2638 start_queue_run_id = argv[++i];
2639 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2640 stop_queue_run_id = argv[++i];
2643 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2644 optionally local only. */
2649 queue_interval = readconf_readtime(argrest, 0, FALSE);
2651 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2652 if (queue_interval <= 0)
2654 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2661 case 'R': /* Synonymous with -qR... */
2662 receiving_message = FALSE;
2664 /* -Rf: As -R (below) but force all deliveries,
2665 -Rff: Ditto, but also thaw all frozen messages,
2666 -Rr: String is regex
2667 -Rrf: Regex and force
2668 -Rrff: Regex and force and thaw
2670 in all cases provided there are no further characters in this
2676 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2678 if (Ustrcmp(argrest, rsopts[i]) == 0)
2680 if (i != 2) queue_run_force = TRUE;
2681 if (i >= 2) deliver_selectstring_regex = TRUE;
2682 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2683 argrest += Ustrlen(rsopts[i]);
2688 /* -R: Set string to match in addresses for forced queue run to
2689 pick out particular messages. */
2693 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2695 fprintf(stderr, "exim: string expected after -R\n");
2699 else deliver_selectstring = argrest;
2703 /* -r: an obsolete synonym for -f (see above) */
2706 /* -S: Like -R but works on sender. */
2708 case 'S': /* Synonymous with -qS... */
2709 receiving_message = FALSE;
2711 /* -Sf: As -S (below) but force all deliveries,
2712 -Sff: Ditto, but also thaw all frozen messages,
2713 -Sr: String is regex
2714 -Srf: Regex and force
2715 -Srff: Regex and force and thaw
2717 in all cases provided there are no further characters in this
2723 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2725 if (Ustrcmp(argrest, rsopts[i]) == 0)
2727 if (i != 2) queue_run_force = TRUE;
2728 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2729 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2730 argrest += Ustrlen(rsopts[i]);
2735 /* -S: Set string to match in addresses for forced queue run to
2736 pick out particular messages. */
2740 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2742 fprintf(stderr, "exim: string expected after -S\n");
2746 else deliver_selectstring_sender = argrest;
2749 /* -Tqt is an option that is exclusively for use by the testing suite.
2750 It is not recognized in other circumstances. It allows for the setting up
2751 of explicit "queue times" so that various warning/retry things can be
2752 tested. Otherwise variability of clock ticks etc. cause problems. */
2755 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2756 fudged_queue_times = argv[++i];
2761 /* -t: Set flag to extract recipients from body of message. */
2764 if (*argrest == 0) extract_recipients = TRUE;
2766 /* -ti: Set flag to extract recipients from body of message, and also
2767 specify that dot does not end the message. */
2769 else if (Ustrcmp(argrest, "i") == 0)
2771 extract_recipients = TRUE;
2775 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2778 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2785 /* -U: This means "initial user submission" in sendmail, apparently. The
2786 doc claims that in future sendmail may refuse syntactically invalid
2787 messages instead of fixing them. For the moment, we just ignore it. */
2793 /* -v: verify things - this is a very low-level debugging */
2798 debug_selector |= D_v;
2799 debug_file = stderr;
2805 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2807 The -x flag tells the sendmail command that mail from a local
2808 mail program has National Language Support (NLS) extended characters
2809 in the body of the mail item. The sendmail command can send mail with
2810 extended NLS characters across networks that normally corrupts these
2813 As Exim is 8-bit clean, it just ignores this flag. */
2816 if (*argrest != 0) badarg = TRUE;
2819 /* All other initial characters are errors */
2824 } /* End of high-level switch statement */
2826 /* Failed to recognize the option, or syntax error */
2830 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2831 "option %s\n", arg);
2837 /* If -R or -S have been specified without -q, assume a single queue run. */
2839 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2840 queue_interval < 0) queue_interval = 0;
2844 /* If usage_wanted is set we call the usage function - which never returns */
2845 if (usage_wanted) exim_usage(called_as);
2847 /* Arguments have been processed. Check for incompatibilities. */
2849 (smtp_input || extract_recipients || recipients_arg < argc) &&
2850 (daemon_listen || queue_interval >= 0 || bi_option ||
2851 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2852 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2855 msg_action_arg > 0 &&
2856 (daemon_listen || queue_interval >= 0 || list_options ||
2857 (checking && msg_action != MSG_LOAD) ||
2858 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2861 (daemon_listen || queue_interval >= 0) &&
2862 (sender_address != NULL || list_options || list_queue || checking ||
2866 daemon_listen && queue_interval == 0
2870 (checking || smtp_input || extract_recipients ||
2871 filter_test != FTEST_NONE || bi_option)
2874 verify_address_mode &&
2875 (address_test_mode || smtp_input || extract_recipients ||
2876 filter_test != FTEST_NONE || bi_option)
2879 address_test_mode && (smtp_input || extract_recipients ||
2880 filter_test != FTEST_NONE || bi_option)
2883 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2887 deliver_selectstring != NULL && queue_interval < 0
2890 msg_action == MSG_LOAD &&
2891 (!expansion_test || expansion_test_message != NULL)
2895 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2899 /* If debugging is set up, set the file and the file descriptor to pass on to
2900 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2901 to run in the foreground. */
2903 if (debug_selector != 0)
2905 debug_file = stderr;
2906 debug_fd = fileno(debug_file);
2907 background_daemon = FALSE;
2908 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2909 if (debug_selector != D_v) /* -v only doesn't show this */
2911 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2912 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2914 show_whats_supported(stderr);
2918 /* When started with root privilege, ensure that the limits on the number of
2919 open files and the number of processes (where that is accessible) are
2920 sufficiently large, or are unset, in case Exim has been called from an
2921 environment where the limits are screwed down. Not all OS have the ability to
2922 change some of these limits. */
2926 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2932 #ifdef RLIMIT_NOFILE
2933 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2935 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2937 rlp.rlim_cur = rlp.rlim_max = 0;
2940 /* I originally chose 1000 as a nice big number that was unlikely to
2941 be exceeded. It turns out that some older OS have a fixed upper limit of
2944 if (rlp.rlim_cur < 1000)
2946 rlp.rlim_cur = rlp.rlim_max = 1000;
2947 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2949 rlp.rlim_cur = rlp.rlim_max = 256;
2950 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2951 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2958 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2960 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2962 rlp.rlim_cur = rlp.rlim_max = 0;
2965 #ifdef RLIM_INFINITY
2966 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2968 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2970 if (rlp.rlim_cur < 1000)
2972 rlp.rlim_cur = rlp.rlim_max = 1000;
2974 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2975 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2981 /* Exim is normally entered as root (but some special configurations are
2982 possible that don't do this). However, it always spins off sub-processes that
2983 set their uid and gid as required for local delivery. We don't want to pass on
2984 any extra groups that root may belong to, so we want to get rid of them all at
2987 We need to obey setgroups() at this stage, before possibly giving up root
2988 privilege for a changed configuration file, but later on we might need to
2989 check on the additional groups for the admin user privilege - can't do that
2990 till after reading the config, which might specify the exim gid. Therefore,
2991 save the group list here first. */
2993 group_count = getgroups(NGROUPS_MAX, group_list);
2995 /* There is a fundamental difference in some BSD systems in the matter of
2996 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2997 known not to be different. On the "different" systems there is a single group
2998 list, and the first entry in it is the current group. On all other versions of
2999 Unix there is a supplementary group list, which is in *addition* to the current
3000 group. Consequently, to get rid of all extraneous groups on a "standard" system
3001 you pass over 0 groups to setgroups(), while on a "different" system you pass
3002 over a single group - the current group, which is always the first group in the
3003 list. Calling setgroups() with zero groups on a "different" system results in
3004 an error return. The following code should cope with both types of system.
3006 However, if this process isn't running as root, setgroups() can't be used
3007 since you have to be root to run it, even if throwing away groups. Not being
3008 root here happens only in some unusual configurations. We just ignore the
3011 if (setgroups(0, NULL) != 0)
3013 if (setgroups(1, group_list) != 0 && !unprivileged)
3015 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3020 /* If the configuration file name has been altered by an argument on the
3021 command line (either a new file name or a macro definition) and the caller is
3022 not root or the exim user, or if this is a filter testing run, remove any
3023 setuid privilege the program has, and run as the underlying user.
3025 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3026 severely restricts the use of -C for some purposes.
3028 Otherwise, set the real ids to the effective values (should be root unless run
3029 from inetd, which it can either be root or the exim uid, if one is configured).
3031 There is a private mechanism for bypassing some of this, in order to make it
3032 possible to test lots of configurations automatically, without having either to
3033 recompile each time, or to patch in an actual configuration file name and other
3034 values (such as the path name). If running in the test harness, pretend that
3035 configuration file changes and macro definitions haven't happened. */
3038 (config_changed || macros != NULL) && /* Config changed, and */
3039 real_uid != root_uid && /* Not root, and */
3040 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3041 real_uid != exim_uid && /* Not exim, and */
3043 !running_in_test_harness /* Not fudged */
3045 expansion_test /* expansion testing */
3047 filter_test != FTEST_NONE) /* Filter testing */
3049 setgroups(group_count, group_list);
3050 exim_setugid(real_uid, real_gid, FALSE,
3051 US"-C, -D, -be or -bf forces real uid");
3052 removed_privilege = TRUE;
3054 /* In the normal case when Exim is called like this, stderr is available
3055 and should be used for any logging information because attempts to write
3056 to the log will usually fail. To arrange this, we unset really_exim. However,
3057 if no stderr is available there is no point - we might as well have a go
3058 at the log (if it fails, syslog will be written). */
3060 if (log_stderr != NULL) really_exim = FALSE;
3063 /* Privilege is to be retained for the moment. It may be dropped later,
3064 depending on the job that this Exim process has been asked to do. For now, set
3065 the real uid to the effective so that subsequent re-execs of Exim are done by a
3068 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3070 /* If testing a filter, open the file(s) now, before wasting time doing other
3071 setups and reading the message. */
3073 if ((filter_test & FTEST_SYSTEM) != 0)
3075 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3078 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3080 return EXIT_FAILURE;
3084 if ((filter_test & FTEST_USER) != 0)
3086 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3089 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3091 return EXIT_FAILURE;
3095 /* Read the main runtime configuration data; this gives up if there
3096 is a failure. It leaves the configuration file open so that the subsequent
3097 configuration data for delivery can be read if needed. */
3101 /* Handle the decoding of logging options. */
3103 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3104 log_selector_string, log_options, log_options_count, US"log", 0);
3108 debug_printf("configuration file is %s\n", config_main_filename);
3109 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3110 log_extra_selector);
3113 /* If domain literals are not allowed, check the sender address that was
3114 supplied with -f. Ditto for a stripped trailing dot. */
3116 if (sender_address != NULL)
3118 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3120 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3121 "allowed\n", sender_address);
3122 return EXIT_FAILURE;
3124 if (f_end_dot && !strip_trailing_dot)
3126 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3127 "(trailing dot not allowed)\n", sender_address);
3128 return EXIT_FAILURE;
3132 /* Paranoia check of maximum lengths of certain strings. There is a check
3133 on the length of the log file path in log.c, which will come into effect
3134 if there are any calls to write the log earlier than this. However, if we
3135 get this far but the string is very long, it is better to stop now than to
3136 carry on and (e.g.) receive a message and then have to collapse. The call to
3137 log_write() from here will cause the ultimate panic collapse if the complete
3138 file name exceeds the buffer length. */
3140 if (Ustrlen(log_file_path) > 200)
3141 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3142 "log_file_path is longer than 200 chars: aborting");
3144 if (Ustrlen(pid_file_path) > 200)
3145 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3146 "pid_file_path is longer than 200 chars: aborting");
3148 if (Ustrlen(spool_directory) > 200)
3149 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3150 "spool_directory is longer than 200 chars: aborting");
3152 /* Length check on the process name given to syslog for its TAG field,
3153 which is only permitted to be 32 characters or less. See RFC 3164. */
3155 if (Ustrlen(syslog_processname) > 32)
3156 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3157 "syslog_processname is longer than 32 chars: aborting");
3159 /* In some operating systems, the environment variable TMPDIR controls where
3160 temporary files are created; Exim doesn't use these (apart from when delivering
3161 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3162 If TMPDIR is found in the environment, reset it to the value defined in the
3163 TMPDIR macro, if this macro is defined. */
3168 for (p = USS environ; *p != NULL; p++)
3170 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3171 Ustrcmp(*p+7, TMPDIR) != 0)
3173 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3174 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3176 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3182 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3183 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3184 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3185 called by a user who has set the TZ variable. This then affects the timestamps
3186 in log files and in Received: headers, and any created Date: header lines. The
3187 required timezone is settable in the configuration file, so nothing can be done
3188 about this earlier - but hopefully nothing will normally be logged earlier than
3189 this. We have to make a new environment if TZ is wrong, but don't bother if
3190 timestamps_utc is set, because then all times are in UTC anyway. */
3192 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3194 timestamps_utc = TRUE;
3198 uschar *envtz = US getenv("TZ");
3199 if ((envtz == NULL && timezone_string != NULL) ||
3201 (timezone_string == NULL ||
3202 Ustrcmp(timezone_string, envtz) != 0)))
3204 uschar **p = USS environ;
3208 while (*p++ != NULL) count++;
3209 if (envtz == NULL) count++;
3210 newp = new = malloc(sizeof(uschar *) * (count + 1));
3211 for (p = USS environ; *p != NULL; p++)
3213 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3216 if (timezone_string != NULL)
3218 *newp = malloc(Ustrlen(timezone_string) + 4);
3219 sprintf(CS *newp++, "TZ=%s", timezone_string);
3224 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3225 tod_stamp(tod_log));
3229 /* Handle the case when we have removed the setuid privilege because of -C or
3230 -D. This means that the caller of Exim was not root, and, provided that
3231 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3234 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3235 were running as the exim user defined in the configuration file (different to
3236 the one in the binary). The sysadmin may expect this case to retain privilege
3237 because "the binary was called by the Exim user", but it hasn't, because of the
3238 order in which it handles this stuff. There are two possibilities:
3240 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3241 to do message deliveries. Thus, the fact that it is running as a
3242 non-privileged user is plausible, and might be wanted in some special
3243 configurations. However, really_exim will have been set false when
3244 privilege was dropped, to stop Exim trying to write to its normal log
3245 files. Therefore, re-enable normal log processing, assuming the sysadmin
3246 has set up the log directory correctly.
3248 (2) If deliver_drop_privilege is not set, the configuration won't work as
3249 apparently intended, and so we log a panic message. In order to retain
3250 root for -C or -D, the caller must either be root or the Exim user
3251 defined in the binary (when deliver_drop_ privilege is false).
3253 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3254 built-in exim user or one defined in the configuration. In either event,
3255 re-enable log processing, assuming the sysadmin knows what they are doing. */
3257 if (removed_privilege && (config_changed || macros != NULL) &&
3258 real_uid == exim_uid)
3260 #ifdef ALT_CONFIG_ROOT_ONLY
3261 really_exim = TRUE; /* let logging work normally */
3264 if (deliver_drop_privilege)
3265 really_exim = TRUE; /* let logging work normally */
3267 log_write(0, LOG_MAIN|LOG_PANIC,
3268 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3269 (int)exim_uid, config_changed? "-C" : "-D");
3273 /* Start up Perl interpreter if Perl support is configured and there is a
3274 perl_startup option, and the configuration or the command line specifies
3275 initializing starting. Note that the global variables are actually called
3276 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3279 if (perl_start_option != 0)
3280 opt_perl_at_start = (perl_start_option > 0);
3281 if (opt_perl_at_start && opt_perl_startup != NULL)
3284 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3285 errstr = init_perl(opt_perl_startup);
3288 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3289 return EXIT_FAILURE;
3291 opt_perl_started = TRUE;
3293 #endif /* EXIM_PERL */
3295 /* Log the arguments of the call if the configuration file said so. This is
3296 a debugging feature for finding out what arguments certain MUAs actually use.
3297 Don't attempt it if logging is disabled, or if listing variables or if
3298 verifying/testing addresses or expansions. */
3300 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3301 && really_exim && !list_options && !checking)
3304 uschar *p = big_buffer;
3306 (void)getcwd(CS p+4, big_buffer_size - 4);
3308 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3310 for (i = 0; i < argc; i++)
3312 int len = Ustrlen(argv[i]);
3315 if (p + len + 8 >= big_buffer + big_buffer_size)
3318 log_write(0, LOG_MAIN, "%s", big_buffer);
3319 Ustrcpy(big_buffer, "...");
3322 printing = string_printing(argv[i]);
3323 if (printing[0] == 0) quote = US"\""; else
3325 uschar *pp = printing;
3327 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3329 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3330 (p - big_buffer) - 4), printing, quote);
3334 if ((log_extra_selector & LX_arguments) != 0)
3335 log_write(0, LOG_MAIN, "%s", big_buffer);
3337 debug_printf("%s\n", big_buffer);
3340 /* Set the working directory to be the top-level spool directory. We don't rely
3341 on this in the code, which always uses fully qualified names, but it's useful
3342 for core dumps etc. Don't complain if it fails - the spool directory might not
3343 be generally accessible and calls with the -C option (and others) have lost
3344 privilege by now. Before the chdir, we try to ensure that the directory exists.
3347 if (Uchdir(spool_directory) != 0)
3349 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3350 (void)Uchdir(spool_directory);
3353 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3354 alias file. Exim doesn't have such a concept, but this call is screwed into
3355 Sun's YP makefiles. Handle this by calling a configured script, as the real
3356 user who called Exim. The -oA option can be used to pass an argument to the
3361 (void)fclose(config_file);
3362 if (bi_command != NULL)
3366 argv[i++] = bi_command;
3367 if (alias_arg != NULL) argv[i++] = alias_arg;
3370 setgroups(group_count, group_list);
3371 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3373 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3374 (argv[1] == NULL)? US"" : argv[1]);
3376 execv(CS argv[0], (char *const *)argv);
3377 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3382 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3387 /* If an action on specific messages is requested, or if a daemon or queue
3388 runner is being started, we need to know if Exim was called by an admin user.
3389 This is the case if the real user is root or exim, or if the real group is
3390 exim, or if one of the supplementary groups is exim or a group listed in
3391 admin_groups. We don't fail all message actions immediately if not admin_user,
3392 since some actions can be performed by non-admin users. Instead, set admin_user
3393 for later interrogation. */
3395 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3400 for (i = 0; i < group_count; i++)
3402 if (group_list[i] == exim_gid) admin_user = TRUE;
3403 else if (admin_groups != NULL)
3405 for (j = 1; j <= (int)(admin_groups[0]); j++)
3406 if (admin_groups[j] == group_list[i])
3407 { admin_user = TRUE; break; }
3409 if (admin_user) break;
3413 /* Another group of privileged users are the trusted users. These are root,
3414 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3415 are permitted to specify sender_addresses with -f on the command line, and
3416 other message parameters as well. */
3418 if (real_uid == root_uid || real_uid == exim_uid)
3419 trusted_caller = TRUE;
3424 if (trusted_users != NULL)
3426 for (i = 1; i <= (int)(trusted_users[0]); i++)
3427 if (trusted_users[i] == real_uid)
3428 { trusted_caller = TRUE; break; }
3431 if (!trusted_caller && trusted_groups != NULL)
3433 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3435 if (trusted_groups[i] == real_gid)
3436 trusted_caller = TRUE;
3437 else for (j = 0; j < group_count; j++)
3439 if (trusted_groups[i] == group_list[j])
3440 { trusted_caller = TRUE; break; }
3442 if (trusted_caller) break;
3447 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3448 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3450 /* Only an admin user may start the daemon or force a queue run in the default
3451 configuration, but the queue run restriction can be relaxed. Only an admin
3452 user may request that a message be returned to its sender forthwith. Only an
3453 admin user may specify a debug level greater than D_v (because it might show
3454 passwords, etc. in lookup queries). Only an admin user may request a queue
3455 count. Only an admin user can use the test interface to scan for email
3456 (because Exim will be in the spool dir and able to look at mails). */
3460 BOOL debugset = (debug_selector & ~D_v) != 0;
3461 if (deliver_give_up || daemon_listen || malware_test_file ||
3462 (count_queue && queue_list_requires_admin) ||
3463 (list_queue && queue_list_requires_admin) ||
3464 (queue_interval >= 0 && prod_requires_admin) ||
3465 (debugset && !running_in_test_harness))
3467 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3472 /* If the real user is not root or the exim uid, the argument for passing
3473 in an open TCP/IP connection for another message is not permitted, nor is
3474 running with the -N option for any delivery action, unless this call to exim is
3475 one that supplied an input message, or we are using a patched exim for
3476 regression testing. */
3478 if (real_uid != root_uid && real_uid != exim_uid &&
3479 (continue_hostname != NULL ||
3481 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3482 )) && !running_in_test_harness)
3484 fprintf(stderr, "exim: Permission denied\n");
3485 return EXIT_FAILURE;
3488 /* If the caller is not trusted, certain arguments are ignored when running for
3489 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3490 Note that authority for performing certain actions on messages is tested in the
3491 queue_action() function. */
3493 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3495 sender_host_name = sender_host_address = interface_address =
3496 sender_ident = received_protocol = NULL;
3497 sender_host_port = interface_port = 0;
3498 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3501 /* If a sender host address is set, extract the optional port number off the
3502 end of it and check its syntax. Do the same thing for the interface address.
3503 Exim exits if the syntax is bad. */
3507 if (sender_host_address != NULL)
3508 sender_host_port = check_port(sender_host_address);
3509 if (interface_address != NULL)
3510 interface_port = check_port(interface_address);
3513 /* If an SMTP message is being received check to see if the standard input is a
3514 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3515 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3520 union sockaddr_46 inetd_sock;
3521 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3522 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3524 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3525 if (family == AF_INET || family == AF_INET6)
3527 union sockaddr_46 interface_sock;
3528 size = sizeof(interface_sock);
3530 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3531 interface_address = host_ntoa(-1, &interface_sock, NULL,
3534 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3536 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3539 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3540 NULL, &sender_host_port);
3541 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3542 "inetd is not supported when mua_wrapper is set");
3547 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3548 return EXIT_FAILURE;
3554 /* If the load average is going to be needed while receiving a message, get it
3555 now for those OS that require the first call to os_getloadavg() to be done as
3556 root. There will be further calls later for each message received. */
3558 #ifdef LOAD_AVG_NEEDS_ROOT
3559 if (receiving_message &&
3560 (queue_only_load >= 0 ||
3561 (is_inetd && smtp_load_reserve >= 0)
3564 load_average = OS_GETLOADAVG();
3568 /* The queue_only configuration option can be overridden by -odx on the command
3569 line, except that if queue_only_override is false, queue_only cannot be unset
3570 from the command line. */
3572 if (queue_only_set && (queue_only_override || arg_queue_only))
3573 queue_only = arg_queue_only;
3575 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3578 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3579 if (arg_smtp_receive_timeout >= 0)
3580 smtp_receive_timeout = arg_smtp_receive_timeout;
3582 /* If Exim was started with root privilege, unless we have already removed the
3583 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3584 except when starting the daemon or doing some kind of delivery or address
3585 testing (-bt). These are the only cases when root need to be retained. We run
3586 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3587 retained only for starting the daemon. We always do the initgroups() in this
3588 situation (controlled by the TRUE below), in order to be as close as possible
3589 to the state Exim usually runs in. */
3591 if (!unprivileged && /* originally had root AND */
3592 !removed_privilege && /* still got root AND */
3593 !daemon_listen && /* not starting the daemon */
3594 queue_interval <= 0 && /* (either kind of daemon) */
3596 deliver_drop_privilege || /* requested unprivileged */
3598 queue_interval < 0 && /* not running the queue */
3599 (msg_action_arg < 0 || /* and */
3600 msg_action != MSG_DELIVER) && /* not delivering and */
3601 (!checking || !address_test_mode) /* not address checking */
3605 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3608 /* When we are retaining a privileged uid, we still change to the exim gid. */
3610 else setgid(exim_gid);
3612 /* Handle a request to scan a file for malware */
3613 if (malware_test_file)
3616 set_process_info("scanning file for malware");
3617 result = malware_in_file(malware_test_file);
3620 printf("No malware found.\n");
3625 printf("Malware lookup returned non-okay/fail: %d\n", result);
3629 printf("Malware found: %s\n", malware_name);
3631 printf("Malware scan detected malware of unknown name.\n");
3635 /* Handle a request to list the delivery queue */
3639 set_process_info("listing the queue");
3640 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3644 /* Handle a request to count the delivery queue */
3648 set_process_info("counting the queue");
3653 /* Handle actions on specific messages, except for the force delivery and
3654 message load actions, which are done below. Some actions take a whole list of
3655 message ids, which are known to continue up to the end of the arguments. Others
3656 take a single message id and then operate on the recipients list. */
3658 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3660 int yield = EXIT_SUCCESS;
3661 set_process_info("acting on specified messages");
3663 if (!one_msg_action)
3665 for (i = msg_action_arg; i < argc; i++)
3666 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3667 yield = EXIT_FAILURE;
3670 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3671 recipients_arg)) yield = EXIT_FAILURE;
3675 /* All the modes below here require the remaining configuration sections
3676 to be read, except that we can skip over the ACL setting when delivering
3677 specific messages, or doing a queue run. (For various testing cases we could
3678 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3681 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3683 /* The configuration data will have been read into POOL_PERM because we won't
3684 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3685 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3686 configuration were read into POOL_MAIN, because we don't do any resets till
3687 later on. However, it seems right, and it does ensure that both pools get used.
3690 store_pool = POOL_MAIN;
3692 /* Handle the -brt option. This is for checking out retry configurations.
3693 The next three arguments are a domain name or a complete address, and
3694 optionally two error numbers. All it does is to call the function that
3695 scans the retry configuration data. */
3697 if (test_retry_arg >= 0)
3699 retry_config *yield;
3700 int basic_errno = 0;
3704 if (test_retry_arg >= argc)
3706 printf("-brt needs a domain or address argument\n");
3707 exim_exit(EXIT_FAILURE);
3709 s1 = argv[test_retry_arg++];
3712 /* If the first argument contains no @ and no . it might be a local user
3713 or it might be a single-component name. Treat as a domain. */
3715 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3717 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3718 "being \ntreated as a one-component domain, not as a local part.\n\n",
3722 /* There may be an optional second domain arg. */
3724 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3725 s2 = argv[test_retry_arg++];
3727 /* The final arg is an error name */
3729 if (test_retry_arg < argc)
3731 uschar *ss = argv[test_retry_arg];
3733 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3736 printf("%s\n", CS error);
3737 return EXIT_FAILURE;
3740 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3741 code > 100 as an error is for matching codes to the decade. Turn them into
3742 a real error code, off the decade. */
3744 if (basic_errno == ERRNO_MAIL4XX ||
3745 basic_errno == ERRNO_RCPT4XX ||
3746 basic_errno == ERRNO_DATA4XX)
3748 int code = (more_errno >> 8) & 255;
3750 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3751 else if (code > 100)
3752 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3756 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3757 if (yield == NULL) printf("No retry information found\n"); else
3760 more_errno = yield->more_errno;
3761 printf("Retry rule: %s ", yield->pattern);
3763 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3765 printf("quota%s%s ",
3766 (more_errno > 0)? "_" : "",
3767 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3769 else if (yield->basic_errno == ECONNREFUSED)
3771 printf("refused%s%s ",
3772 (more_errno > 0)? "_" : "",
3773 (more_errno == 'M')? "MX" :
3774 (more_errno == 'A')? "A" : "");
3776 else if (yield->basic_errno == ETIMEDOUT)
3779 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3781 if (more_errno != 0) printf("_%s",
3782 (more_errno == 'M')? "MX" : "A");
3785 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3786 printf("auth_failed ");
3789 for (r = yield->rules; r != NULL; r = r->next)
3791 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3792 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3798 printf(",%d.", x/1000);
3812 exim_exit(EXIT_SUCCESS);
3815 /* Handle a request to list one or more configuration options */
3819 set_process_info("listing variables");
3820 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3821 else for (i = recipients_arg; i < argc; i++)
3824 (Ustrcmp(argv[i], "router") == 0 ||
3825 Ustrcmp(argv[i], "transport") == 0 ||
3826 Ustrcmp(argv[i], "authenticator") == 0 ||
3827 Ustrcmp(argv[i], "macro") == 0))
3829 readconf_print(argv[i+1], argv[i]);
3832 else readconf_print(argv[i], NULL);
3834 exim_exit(EXIT_SUCCESS);
3838 /* Handle a request to deliver one or more messages that are already on the
3839 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3840 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3842 Delivery of specific messages is typically used for a small number when
3843 prodding by hand (when the option forced_delivery will be set) or when
3844 re-execing to regain root privilege. Each message delivery must happen in a
3845 separate process, so we fork a process for each one, and run them sequentially
3846 so that debugging output doesn't get intertwined, and to avoid spawning too
3847 many processes if a long list is given. However, don't fork for the last one;
3848 this saves a process in the common case when Exim is called to deliver just one
3851 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3853 if (prod_requires_admin && !admin_user)
3855 fprintf(stderr, "exim: Permission denied\n");
3856 exim_exit(EXIT_FAILURE);
3858 set_process_info("delivering specified messages");
3859 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3860 for (i = msg_action_arg; i < argc; i++)
3865 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3866 else if ((pid = fork()) == 0)
3868 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3869 _exit(EXIT_SUCCESS);
3873 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3875 exim_exit(EXIT_FAILURE);
3879 exim_exit(EXIT_SUCCESS);
3883 /* If only a single queue run is requested, without SMTP listening, we can just
3884 turn into a queue runner, with an optional starting message id. */
3886 if (queue_interval == 0 && !daemon_listen)
3888 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3889 (start_queue_run_id == NULL)? US"" : US" starting at ",
3890 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3891 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3892 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3893 set_process_info("running the queue (single queue run)");
3894 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3895 exim_exit(EXIT_SUCCESS);
3899 /* Find the login name of the real user running this process. This is always
3900 needed when receiving a message, because it is written into the spool file. It
3901 may also be used to construct a from: or a sender: header, and in this case we
3902 need the user's full name as well, so save a copy of it, checked for RFC822
3903 syntax and munged if necessary, if it hasn't previously been set by the -F
3904 argument. We may try to get the passwd entry more than once, in case NIS or
3905 other delays are in evidence. Save the home directory for use in filter testing
3910 if ((pw = getpwuid(real_uid)) != NULL)
3912 originator_login = string_copy(US pw->pw_name);
3913 originator_home = string_copy(US pw->pw_dir);
3915 /* If user name has not been set by -F, set it from the passwd entry
3916 unless -f has been used to set the sender address by a trusted user. */
3918 if (originator_name == NULL)
3920 if (sender_address == NULL ||
3921 (!trusted_caller && filter_test == FTEST_NONE))
3923 uschar *name = US pw->pw_gecos;
3924 uschar *amp = Ustrchr(name, '&');
3927 /* Most Unix specify that a '&' character in the gecos field is
3928 replaced by a copy of the login name, and some even specify that
3929 the first character should be upper cased, so that's what we do. */
3934 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3935 amp - name, name, &loffset, originator_login, amp + 1);
3936 buffer[loffset] = toupper(buffer[loffset]);
3940 /* If a pattern for matching the gecos field was supplied, apply
3941 it and then expand the name string. */
3943 if (gecos_pattern != NULL && gecos_name != NULL)
3946 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3948 if (regex_match_and_setup(re, name, 0, -1))
3950 uschar *new_name = expand_string(gecos_name);
3952 if (new_name != NULL)
3954 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3955 "gecos field \"%s\"\n", new_name, name);
3958 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3959 "\"%s\": %s\n", gecos_name, expand_string_message);
3961 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3962 "gecos field \"%s\"\n", gecos_pattern, name);
3963 store_free((void *)re);
3965 originator_name = string_copy(name);
3968 /* A trusted caller has used -f but not -F */
3970 else originator_name = US"";
3973 /* Break the retry loop */
3978 if (++i > finduser_retries) break;
3982 /* If we cannot get a user login, log the incident and give up, unless the
3983 configuration specifies something to use. When running in the test harness,
3984 any setting of unknown_login overrides the actual name. */
3986 if (originator_login == NULL || running_in_test_harness)
3988 if (unknown_login != NULL)
3990 originator_login = expand_string(unknown_login);
3991 if (originator_name == NULL && unknown_username != NULL)
3992 originator_name = expand_string(unknown_username);
3993 if (originator_name == NULL) originator_name = US"";
3995 if (originator_login == NULL)
3996 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4000 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4003 originator_name = string_copy(parse_fix_phrase(originator_name,
4004 Ustrlen(originator_name), big_buffer, big_buffer_size));
4006 /* If a message is created by this call of Exim, the uid/gid of its originator
4007 are those of the caller. These values are overridden if an existing message is
4008 read in from the spool. */
4010 originator_uid = real_uid;
4011 originator_gid = real_gid;
4013 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4014 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4016 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4017 returns. We leave this till here so that the originator_ fields are available
4018 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4021 if (daemon_listen || queue_interval > 0)
4025 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4026 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4027 "mua_wrapper is set");
4032 /* If the sender ident has not been set (by a trusted caller) set it to
4033 the caller. This will get overwritten below for an inetd call. If a trusted
4034 caller has set it empty, unset it. */
4036 if (sender_ident == NULL) sender_ident = originator_login;
4037 else if (sender_ident[0] == 0) sender_ident = NULL;
4039 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4040 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4041 originator_* variables set. */
4043 if (test_rewrite_arg >= 0)
4045 really_exim = FALSE;
4046 if (test_rewrite_arg >= argc)
4048 printf("-brw needs an address argument\n");
4049 exim_exit(EXIT_FAILURE);
4051 rewrite_test(argv[test_rewrite_arg]);
4052 exim_exit(EXIT_SUCCESS);
4055 /* A locally-supplied message is considered to be coming from a local user
4056 unless a trusted caller supplies a sender address with -f, or is passing in the
4057 message via SMTP (inetd invocation or otherwise). */
4059 if ((sender_address == NULL && !smtp_input) ||
4060 (!trusted_caller && filter_test == FTEST_NONE))
4062 sender_local = TRUE;
4064 /* A trusted caller can supply authenticated_sender and authenticated_id
4065 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4066 defaults except when host checking. */
4068 if (authenticated_sender == NULL && !host_checking)
4069 authenticated_sender = string_sprintf("%s@%s", originator_login,
4070 qualify_domain_sender);
4071 if (authenticated_id == NULL && !host_checking)
4072 authenticated_id = originator_login;
4075 /* Trusted callers are always permitted to specify the sender address.
4076 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4077 is specified is the empty address. However, if a trusted caller does not
4078 specify a sender address for SMTP input, we leave sender_address unset. This
4079 causes the MAIL commands to be honoured. */
4081 if ((!smtp_input && sender_address == NULL) ||
4082 !receive_check_set_sender(sender_address))
4084 /* Either the caller is not permitted to set a general sender, or this is
4085 non-SMTP input and the trusted caller has not set a sender. If there is no
4086 sender, or if a sender other than <> is set, override with the originator's
4087 login (which will get qualified below), except when checking things. */
4089 if (sender_address == NULL /* No sender_address set */
4091 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4092 !checking && /* Not running tests, AND */
4093 filter_test == FTEST_NONE)) /* Not testing a filter */
4095 sender_address = originator_login;
4096 sender_address_forced = FALSE;
4097 sender_address_domain = 0;
4101 /* Remember whether an untrusted caller set the sender address */
4103 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4105 /* Ensure that the sender address is fully qualified unless it is the empty
4106 address, which indicates an error message, or doesn't exist (root caller, smtp
4107 interface, no -f argument). */
4109 if (sender_address != NULL && sender_address[0] != 0 &&
4110 sender_address_domain == 0)
4111 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4112 qualify_domain_sender);
4114 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4116 /* Handle a request to verify a list of addresses, or test them for delivery.
4117 This must follow the setting of the sender address, since routers can be
4118 predicated upon the sender. If no arguments are given, read addresses from
4119 stdin. Set debug_level to at least D_v to get full output for address testing.
4122 if (verify_address_mode || address_test_mode)
4125 int flags = vopt_qualify;
4127 if (verify_address_mode)
4129 if (!verify_as_sender) flags |= vopt_is_recipient;
4130 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4135 flags |= vopt_is_recipient;
4136 debug_selector |= D_v;
4137 debug_file = stderr;
4138 debug_fd = fileno(debug_file);
4139 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4142 if (recipients_arg < argc)
4144 while (recipients_arg < argc)
4146 uschar *s = argv[recipients_arg++];
4149 BOOL finished = FALSE;
4150 uschar *ss = parse_find_address_end(s, FALSE);
4151 if (*ss == ',') *ss = 0; else finished = TRUE;
4152 test_address(s, flags, &exit_value);
4155 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4162 uschar *s = get_stdinput(NULL, NULL);
4163 if (s == NULL) break;
4164 test_address(s, flags, &exit_value);
4168 exim_exit(exit_value);
4171 /* Handle expansion checking. Either expand items on the command line, or read
4172 from stdin if there aren't any. If -Mset was specified, load the message so
4173 that its variables can be used, but restrict this facility to admin users.
4174 Otherwise, if -bem was used, read a message from stdin. */
4178 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4180 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4183 fprintf(stderr, "exim: permission denied\n");
4186 message_id = argv[msg_action_arg];
4187 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4188 if (!spool_open_datafile(message_id))
4189 printf ("Failed to load message datafile %s\n", message_id);
4190 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4191 printf ("Failed to load message %s\n", message_id);
4194 /* Read a test message from a file. We fudge it up to be on stdin, saving
4195 stdin itself for later reading of expansion strings. */
4197 else if (expansion_test_message != NULL)
4199 int save_stdin = dup(0);
4200 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4203 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4205 return EXIT_FAILURE;
4208 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4209 message_ended = END_NOTENDED;
4210 read_message_body(receive_msg(extract_recipients));
4211 message_linecount += body_linecount;
4212 (void)dup2(save_stdin, 0);
4213 (void)close(save_stdin);
4214 clearerr(stdin); /* Required by Darwin */
4217 /* Allow $recipients for this testing */
4219 enable_dollar_recipients = TRUE;
4221 /* Expand command line items */
4223 if (recipients_arg < argc)
4225 while (recipients_arg < argc)
4227 uschar *s = argv[recipients_arg++];
4228 uschar *ss = expand_string(s);
4229 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4230 else printf("%s\n", CS ss);
4238 char *(*fn_readline)(char *) = NULL;
4239 char *(*fn_addhist)(char *) = NULL;
4242 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4248 uschar *source = get_stdinput(fn_readline, fn_addhist);
4249 if (source == NULL) break;
4250 ss = expand_string(source);
4252 printf ("Failed: %s\n", expand_string_message);
4253 else printf("%s\n", CS ss);
4257 if (dlhandle != NULL) dlclose(dlhandle);
4261 /* The data file will be open after -Mset */
4263 if (deliver_datafile >= 0)
4265 (void)close(deliver_datafile);
4266 deliver_datafile = -1;
4269 exim_exit(EXIT_SUCCESS);
4273 /* The active host name is normally the primary host name, but it can be varied
4274 for hosts that want to play several parts at once. We need to ensure that it is
4275 set for host checking, and for receiving messages. */
4277 smtp_active_hostname = primary_hostname;
4278 if (raw_active_hostname != NULL)
4280 uschar *nah = expand_string(raw_active_hostname);
4283 if (!expand_string_forcedfail)
4284 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4285 "(smtp_active_hostname): %s", raw_active_hostname,
4286 expand_string_message);
4288 else if (nah[0] != 0) smtp_active_hostname = nah;
4291 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4292 given IP address so that the blocking and relay configuration can be tested.
4293 Unless a sender_ident was set by -oMt, we discard it (the default is the
4294 caller's login name). An RFC 1413 call is made only if we are running in the
4295 test harness and an incoming interface and both ports are specified, because
4296 there is no TCP/IP call to find the ident for. */
4303 if (!sender_ident_set)
4305 sender_ident = NULL;
4306 if (running_in_test_harness && sender_host_port != 0 &&
4307 interface_address != NULL && interface_port != 0)
4308 verify_get_ident(1413);
4311 /* In case the given address is a non-canonical IPv6 address, canonicize
4312 it. The code works for both IPv4 and IPv6, as it happens. */
4314 size = host_aton(sender_host_address, x);
4315 sender_host_address = store_get(48); /* large enough for full IPv6 */
4316 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4318 /* Now set up for testing */
4320 host_build_sender_fullhost();
4324 sender_local = FALSE;
4325 sender_host_notsocket = TRUE;
4326 debug_file = stderr;
4327 debug_fd = fileno(debug_file);
4328 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4329 "**** but without any ident (RFC 1413) callback.\n"
4330 "**** This is not for real!\n\n",
4331 sender_host_address);
4333 if (verify_check_host(&hosts_connection_nolog) == OK)
4334 log_write_selector &= ~L_smtp_connection;
4335 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4337 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4338 because a log line has already been written for all its failure exists
4339 (usually "connection refused: <reason>") and writing another one is
4340 unnecessary clutter. */
4342 if (smtp_start_session())
4344 reset_point = store_get(0);
4347 store_reset(reset_point);
4348 if (smtp_setup_msg() <= 0) break;
4349 if (!receive_msg(FALSE)) break;
4353 exim_exit(EXIT_SUCCESS);
4357 /* Arrange for message reception if recipients or SMTP were specified;
4358 otherwise complain unless a version print (-bV) happened or this is a filter
4359 verification test. In the former case, show the configuration file name. */
4361 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4363 if (version_printed)
4365 printf("Configuration file is %s\n", config_main_filename);
4366 return EXIT_SUCCESS;
4369 if (filter_test == FTEST_NONE)
4370 exim_usage(called_as);
4374 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4375 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4376 that we are not called from inetd, because that is rejected above. The
4377 following configuration settings are forced here:
4379 (1) Synchronous delivery (-odi)
4380 (2) Errors to stderr (-oep == -oeq)
4381 (3) No parallel remote delivery
4382 (4) Unprivileged delivery
4384 We don't force overall queueing options because there are several of them;
4385 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4386 to override any SMTP queueing. */
4390 synchronous_delivery = TRUE;
4391 arg_error_handling = ERRORS_STDERR;
4392 remote_max_parallel = 1;
4393 deliver_drop_privilege = TRUE;
4395 queue_smtp_domains = NULL;
4399 /* Prepare to accept one or more new messages on the standard input. When a
4400 message has been read, its id is returned in message_id[]. If doing immediate
4401 delivery, we fork a delivery process for each received message, except for the
4402 last one, where we can save a process switch.
4404 It is only in non-smtp mode that error_handling is allowed to be changed from
4405 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4406 sendmail error modes other than -oem ever actually used? Later: yes.) */
4408 if (!smtp_input) error_handling = arg_error_handling;
4410 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4411 logging being sent down the socket and make an identd call to get the
4416 (void)fclose(stderr);
4417 exim_nullstd(); /* Re-open to /dev/null */
4418 verify_get_ident(IDENT_PORT);
4419 host_build_sender_fullhost();
4420 set_process_info("handling incoming connection from %s via inetd",
4424 /* If the sender host address has been set, build sender_fullhost if it hasn't
4425 already been done (which it will have been for inetd). This caters for the
4426 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4427 so that the test for IP options is skipped for -bs input. */
4429 if (sender_host_address != NULL && sender_fullhost == NULL)
4431 host_build_sender_fullhost();
4432 set_process_info("handling incoming connection from %s via -oMa",
4434 sender_host_notsocket = TRUE;
4437 /* Otherwise, set the sender host as unknown except for inetd calls. This
4438 prevents host checking in the case of -bs not from inetd and also for -bS. */
4440 else if (!is_inetd) sender_host_unknown = TRUE;
4442 /* If stdout does not exist, then dup stdin to stdout. This can happen
4443 if exim is started from inetd. In this case fd 0 will be set to the socket,
4444 but fd 1 will not be set. This also happens for passed SMTP channels. */
4446 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4448 /* Set up the incoming protocol name and the state of the program. Root is
4449 allowed to force received protocol via the -oMr option above. If we have come
4450 via inetd, the process info has already been set up. We don't set
4451 received_protocol here for smtp input, as it varies according to
4452 batch/HELO/EHLO/AUTH/TLS. */
4456 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4457 smtp_batched_input? "batched " : "",
4458 (sender_address!= NULL)? sender_address : originator_login);
4462 if (received_protocol == NULL)
4463 received_protocol = string_sprintf("local%s", called_as);
4464 set_process_info("accepting a local non-SMTP message from <%s>",
4468 /* Initialize the session_local_queue-only flag (this will be ignored if
4469 mua_wrapper is set) */
4472 session_local_queue_only = queue_only;
4474 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4475 the spool if so configured. On failure, we must not attempt to send an error
4476 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4477 error code is given.) */
4479 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4481 fprintf(stderr, "exim: insufficient disk space\n");
4482 return EXIT_FAILURE;
4485 /* If this is smtp input of any kind, real or batched, handle the start of the
4488 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4489 because a log line has already been written for all its failure exists
4490 (usually "connection refused: <reason>") and writing another one is
4491 unnecessary clutter. */
4497 if (verify_check_host(&hosts_connection_nolog) == OK)
4498 log_write_selector &= ~L_smtp_connection;
4499 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4500 if (!smtp_start_session())
4503 exim_exit(EXIT_SUCCESS);
4507 /* Otherwise, set up the input size limit here. */
4511 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4512 if (expand_string_message != NULL)
4514 if (thismessage_size_limit == -1)
4515 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4516 "message_size_limit: %s", expand_string_message);
4518 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4519 "message_size_limit: %s", expand_string_message);
4523 /* Loop for several messages when reading SMTP input. If we fork any child
4524 processes, we don't want to wait for them unless synchronous delivery is
4525 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4526 same as SIG_DFL, despite the fact that documentation often lists the default as
4527 "ignore". This is a confusing area. This is what I know:
4529 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4530 processes that complete simply to go away without ever becoming defunct. You
4531 can't then wait for them - but we don't want to wait for them in the
4532 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4533 happen for all OS (e.g. *BSD is different).
4535 But that's not the end of the story. Some (many? all?) systems have the
4536 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4537 has by default, so it seems that the difference is merely one of default
4538 (compare restarting vs non-restarting signals).
4540 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4541 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4542 of the loop below. Paranoia rules.
4544 February 2003: That's *still* not the end of the story. There are now versions
4545 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4546 process then calls waitpid(), a grumble is written to the system log, because
4547 this is logically inconsistent. In other words, it doesn't like the paranoia.
4548 As a consequenc of this, the waitpid() below is now excluded if we are sure
4549 that SIG_IGN works. */
4551 if (!synchronous_delivery)
4554 struct sigaction act;
4555 act.sa_handler = SIG_IGN;
4556 sigemptyset(&(act.sa_mask));
4557 act.sa_flags = SA_NOCLDWAIT;
4558 sigaction(SIGCHLD, &act, NULL);
4560 signal(SIGCHLD, SIG_IGN);
4564 /* Save the current store pool point, for resetting at the start of
4565 each message, and save the real sender address, if any. */
4567 reset_point = store_get(0);
4568 real_sender_address = sender_address;
4570 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4571 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4576 store_reset(reset_point);
4579 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4580 input and build the recipients list, before calling receive_msg() to read the
4581 message proper. Whatever sender address is given in the SMTP transaction is
4582 often ignored for local senders - we use the actual sender, which is normally
4583 either the underlying user running this process or a -f argument provided by
4584 a trusted caller. It is saved in real_sender_address. The test for whether to
4585 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4590 if ((rc = smtp_setup_msg()) > 0)
4592 if (real_sender_address != NULL &&
4593 !receive_check_set_sender(sender_address))
4595 sender_address = raw_sender = real_sender_address;
4596 sender_address_unrewritten = NULL;
4599 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4600 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4601 the very end. The result of the ACL is ignored (as for other non-SMTP
4602 messages). It is run for its potential side effects. */
4604 if (smtp_batched_input && acl_not_smtp_start != NULL)
4606 uschar *user_msg, *log_msg;
4607 enable_dollar_recipients = TRUE;
4608 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4609 &user_msg, &log_msg);
4610 enable_dollar_recipients = FALSE;
4613 /* Now get the data for the message */
4615 more = receive_msg(extract_recipients);
4616 if (message_id[0] == 0)
4619 smtp_log_no_mail(); /* Log no mail if configured */
4620 exim_exit(EXIT_FAILURE);
4625 smtp_log_no_mail(); /* Log no mail if configured */
4626 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4630 /* In the non-SMTP case, we have all the information from the command
4631 line, but must process it in case it is in the more general RFC822
4632 format, and in any case, to detect syntax errors. Also, it appears that
4633 the use of comma-separated lists as single arguments is common, so we
4634 had better support them. */
4640 int count = argc - recipients_arg;
4641 uschar **list = argv + recipients_arg;
4643 /* These options cannot be changed dynamically for non-SMTP messages */
4645 active_local_sender_retain = local_sender_retain;
4646 active_local_from_check = local_from_check;
4648 /* Save before any rewriting */
4650 raw_sender = string_copy(sender_address);
4652 /* Loop for each argument */
4654 for (i = 0; i < count; i++)
4656 int start, end, domain;
4658 uschar *s = list[i];
4660 /* Loop for each comma-separated address */
4664 BOOL finished = FALSE;
4666 uschar *ss = parse_find_address_end(s, FALSE);
4668 if (*ss == ',') *ss = 0; else finished = TRUE;
4670 /* Check max recipients - if -t was used, these aren't recipients */
4672 if (recipients_max > 0 && ++rcount > recipients_max &&
4673 !extract_recipients)
4675 if (error_handling == ERRORS_STDERR)
4677 fprintf(stderr, "exim: too many recipients\n");
4678 exim_exit(EXIT_FAILURE);
4683 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4684 errors_sender_rc : EXIT_FAILURE;
4689 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4691 if (domain == 0 && !allow_unqualified_recipient)
4694 errmess = US"unqualified recipient address not allowed";
4697 if (recipient == NULL)
4699 if (error_handling == ERRORS_STDERR)
4701 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4702 string_printing(list[i]), errmess);
4703 exim_exit(EXIT_FAILURE);
4709 eblock.text1 = string_printing(list[i]);
4710 eblock.text2 = errmess;
4712 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4713 errors_sender_rc : EXIT_FAILURE;
4717 receive_add_recipient(recipient, -1);
4720 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4724 /* Show the recipients when debugging */
4729 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4730 if (recipients_list != NULL)
4732 debug_printf("Recipients:\n");
4733 for (i = 0; i < recipients_count; i++)
4734 debug_printf(" %s\n", recipients_list[i].address);
4738 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4739 ignored; rejecting here would just add complication, and it can just as
4740 well be done later. Allow $recipients to be visible in the ACL. */
4742 if (acl_not_smtp_start != NULL)
4744 uschar *user_msg, *log_msg;
4745 enable_dollar_recipients = TRUE;
4746 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4747 &user_msg, &log_msg);
4748 enable_dollar_recipients = FALSE;
4751 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4752 will just read the headers for the message, and not write anything onto the
4755 message_ended = END_NOTENDED;
4756 more = receive_msg(extract_recipients);
4758 /* more is always FALSE here (not SMTP message) when reading a message
4759 for real; when reading the headers of a message for filter testing,
4760 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4762 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4763 } /* Non-SMTP message reception */
4765 /* If this is a filter testing run, there are headers in store, but
4766 no message on the spool. Run the filtering code in testing mode, setting
4767 the domain to the qualify domain and the local part to the current user,
4768 unless they have been set by options. The prefix and suffix are left unset
4769 unless specified. The the return path is set to to the sender unless it has
4770 already been set from a return-path header in the message. */
4772 if (filter_test != FTEST_NONE)
4774 deliver_domain = (ftest_domain != NULL)?
4775 ftest_domain : qualify_domain_recipient;
4776 deliver_domain_orig = deliver_domain;
4777 deliver_localpart = (ftest_localpart != NULL)?
4778 ftest_localpart : originator_login;
4779 deliver_localpart_orig = deliver_localpart;
4780 deliver_localpart_prefix = ftest_prefix;
4781 deliver_localpart_suffix = ftest_suffix;
4782 deliver_home = originator_home;
4784 if (return_path == NULL)
4786 printf("Return-path copied from sender\n");
4787 return_path = string_copy(sender_address);
4791 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4793 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4795 receive_add_recipient(
4796 string_sprintf("%s%s%s@%s",
4797 (ftest_prefix == NULL)? US"" : ftest_prefix,
4799 (ftest_suffix == NULL)? US"" : ftest_suffix,
4800 deliver_domain), -1);
4802 printf("Recipient = %s\n", recipients_list[0].address);
4803 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4804 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4806 (void)chdir("/"); /* Get away from wherever the user is running this from */
4808 /* Now we run either a system filter test, or a user filter test, or both.
4809 In the latter case, headers added by the system filter will persist and be
4810 available to the user filter. We need to copy the filter variables
4813 if ((filter_test & FTEST_SYSTEM) != 0)
4815 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4816 exim_exit(EXIT_FAILURE);
4819 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4821 if ((filter_test & FTEST_USER) != 0)
4823 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4824 exim_exit(EXIT_FAILURE);
4827 exim_exit(EXIT_SUCCESS);
4830 /* Else act on the result of message reception. We should not get here unless
4831 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4832 will be TRUE. If it is not, check on the number of messages received in this
4835 if (!session_local_queue_only &&
4836 smtp_accept_queue_per_connection > 0 &&
4837 receive_messagecount > smtp_accept_queue_per_connection)
4839 session_local_queue_only = TRUE;
4840 queue_only_reason = 2;
4843 /* Initialize local_queue_only from session_local_queue_only. If it is false,
4844 and queue_only_load is set, check that the load average is below it. If it is
4845 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4846 default), we put the whole session into queue_only mode. It then remains this
4847 way for any subsequent messages on the same SMTP connection. This is a
4848 deliberate choice; even though the load average may fall, it doesn't seem
4849 right to deliver later messages on the same call when not delivering earlier
4850 ones. However, there are odd cases where this is not wanted, so this can be
4851 changed by setting queue_only_load_latch false. */
4853 local_queue_only = session_local_queue_only;
4854 if (!local_queue_only && queue_only_load >= 0)
4856 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4857 if (local_queue_only)
4859 queue_only_reason = 3;
4860 if (queue_only_load_latch) session_local_queue_only = TRUE;
4864 /* If running as an MUA wrapper, all queueing options and freezing options
4868 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4870 /* Log the queueing here, when it will get a message id attached, but
4871 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4874 if (local_queue_only) switch(queue_only_reason)
4877 log_write(L_delay_delivery,
4878 LOG_MAIN, "no immediate delivery: more than %d messages "
4879 "received in one connection", smtp_accept_queue_per_connection);
4883 log_write(L_delay_delivery,
4884 LOG_MAIN, "no immediate delivery: load average %.2f",
4885 (double)load_average/1000.0);
4889 /* Else do the delivery unless the ACL or local_scan() called for queue only
4890 or froze the message. Always deliver in a separate process. A fork failure is
4891 not a disaster, as the delivery will eventually happen on a subsequent queue
4892 run. The search cache must be tidied before the fork, as the parent will
4893 do it before exiting. The child will trigger a lookup failure and
4894 thereby defer the delivery if it tries to use (for example) a cached ldap
4895 connection that the parent has called unbind on. */
4897 else if (!queue_only_policy && !deliver_freeze)
4902 if ((pid = fork()) == 0)
4905 close_unwanted(); /* Close unwanted file descriptors and TLS */
4906 exim_nullstd(); /* Ensure std{in,out,err} exist */
4908 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4909 mode, deliver_drop_privilege is forced TRUE). */
4911 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4913 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4915 /* Control does not return here. */
4918 /* No need to re-exec */
4920 rc = deliver_message(message_id, FALSE, FALSE);
4922 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4923 EXIT_SUCCESS : EXIT_FAILURE);
4928 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4929 "process: %s", strerror(errno));
4932 /* In the parent, wait if synchronous delivery is required. This will
4933 always be the case in MUA wrapper mode. */
4935 else if (synchronous_delivery)
4938 while (wait(&status) != pid);
4939 if ((status & 0x00ff) != 0)
4940 log_write(0, LOG_MAIN|LOG_PANIC,
4941 "process %d crashed with signal %d while delivering %s",
4942 (int)pid, status & 0x00ff, message_id);
4943 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4947 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4948 automatically reaps children (see comments above the loop), clear away any
4949 finished subprocesses here, in case there are lots of messages coming in
4950 from the same source. */
4952 #ifndef SIG_IGN_WORKS
4953 while (waitpid(-1, NULL, WNOHANG) > 0);
4957 exim_exit(EXIT_SUCCESS); /* Never returns */
4958 return 0; /* To stop compiler warning */