1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
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/--version and for -d to output the optional
689 features 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: " SIZE_T_FMT "\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))
1239 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1243 exim_gid = pw->pw_gid;
1247 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1253 #ifdef EXIM_GROUPNAME
1254 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1256 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1262 #ifdef CONFIGURE_OWNERNAME
1263 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1265 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1266 CONFIGURE_OWNERNAME);
1271 #ifdef CONFIGURE_GROUPNAME
1272 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1274 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1275 CONFIGURE_GROUPNAME);
1280 /* In the Cygwin environment, some initialization needs doing. It is fudged
1281 in by means of this macro. */
1287 /* Check a field which is patched when we are running Exim within its
1288 testing harness; do a fast initial check, and then the whole thing. */
1290 running_in_test_harness =
1291 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1293 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1294 at the start of a program; however, it seems that some environments do not
1295 follow this. A "strange" locale can affect the formatting of timestamps, so we
1298 setlocale(LC_ALL, "C");
1300 /* Set up the default handler for timing using alarm(). */
1302 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1304 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1305 because store_malloc writes a log entry on failure. */
1307 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1308 if (log_buffer == NULL)
1310 fprintf(stderr, "exim: failed to get store for log buffer\n");
1314 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1315 NULL when the daemon is run and the file is closed. We have to use this
1316 indirection, because some systems don't allow writing to the variable "stderr".
1319 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1321 /* Arrange for the PCRE regex library to use our store functions. Note that
1322 the normal calls are actually macros that add additional arguments for
1323 debugging purposes so we have to assign specially constructed functions here.
1324 The default is to use store in the stacking pool, but this is overridden in the
1325 regex_must_compile() function. */
1327 pcre_malloc = function_store_get;
1328 pcre_free = function_dummy_free;
1330 /* Ensure there is a big buffer for temporary use in several places. It is put
1331 in malloc store so that it can be freed for enlargement if necessary. */
1333 big_buffer = store_malloc(big_buffer_size);
1335 /* Set up the handler for the data request signal, and set the initial
1336 descriptive text. */
1338 set_process_info("initializing");
1339 os_restarting_signal(SIGUSR1, usr1_handler);
1341 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1342 in the daemon code. For the rest of Exim's uses, we ignore it. */
1344 signal(SIGHUP, SIG_IGN);
1346 /* We don't want to die on pipe errors as the code is written to handle
1347 the write error instead. */
1349 signal(SIGPIPE, SIG_IGN);
1351 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1352 set to SIG_IGN. This causes subprocesses that complete before the parent
1353 process waits for them not to hang around, so when Exim calls wait(), nothing
1354 is there. The wait() code has been made robust against this, but let's ensure
1355 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1356 ending status. We use sigaction rather than plain signal() on those OS where
1357 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1358 problem on AIX with this.) */
1362 struct sigaction act;
1363 act.sa_handler = SIG_DFL;
1364 sigemptyset(&(act.sa_mask));
1366 sigaction(SIGCHLD, &act, NULL);
1369 signal(SIGCHLD, SIG_DFL);
1372 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1377 /* Set up the version number. Set up the leading 'E' for the external form of
1378 message ids, set the pointer to the internal form, and initialize it to
1379 indicate no message being processed. */
1382 message_id_option[0] = '-';
1383 message_id_external = message_id_option + 1;
1384 message_id_external[0] = 'E';
1385 message_id = message_id_external + 1;
1388 /* Set the umask to zero so that any files Exim creates using open() are
1389 created with the modes that it specifies. NOTE: Files created with fopen() have
1390 a problem, which was not recognized till rather late (February 2006). With this
1391 umask, such files will be world writeable. (They are all content scanning files
1392 in the spool directory, which isn't world-accessible, so this is not a
1393 disaster, but it's untidy.) I don't want to change this overall setting,
1394 however, because it will interact badly with the open() calls. Instead, there's
1395 now a function called modefopen() that fiddles with the umask while calling
1400 /* Precompile the regular expression for matching a message id. Keep this in
1401 step with the code that generates ids in the accept.c module. We need to do
1402 this here, because the -M options check their arguments for syntactic validity
1403 using mac_ismsgid, which uses this. */
1406 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1408 /* Precompile the regular expression that is used for matching an SMTP error
1409 code, possibly extended, at the start of an error message. Note that the
1410 terminating whitespace character is included. */
1413 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1416 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1417 this seems to be a generally accepted convention, since one finds symbolic
1418 links called "mailq" in standard OS configurations. */
1420 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1421 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1424 receiving_message = FALSE;
1425 called_as = US"-mailq";
1428 /* If the program is called as "rmail" treat it as equivalent to
1429 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1430 i.e. preventing a single dot on a line from terminating the message, and
1431 returning with zero return code, even in cases of error (provided an error
1432 message has been sent). */
1434 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1435 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1438 called_as = US"-rmail";
1439 errors_sender_rc = EXIT_SUCCESS;
1442 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1443 this is a smail convention. */
1445 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1446 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1448 smtp_input = smtp_batched_input = TRUE;
1449 called_as = US"-rsmtp";
1452 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1453 this is a smail convention. */
1455 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1456 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1459 receiving_message = FALSE;
1460 called_as = US"-runq";
1463 /* If the program is called as "newaliases" treat it as equivalent to
1464 "exim -bi"; this is a sendmail convention. */
1466 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1467 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1470 receiving_message = FALSE;
1471 called_as = US"-newaliases";
1474 /* Save the original effective uid for a couple of uses later. It should
1475 normally be root, but in some esoteric environments it may not be. */
1477 original_euid = geteuid();
1479 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1480 to be the same as the real ones. This makes a difference only if Exim is setuid
1481 (or setgid) to something other than root, which could be the case in some
1482 special configurations. */
1484 real_uid = getuid();
1485 real_gid = getgid();
1487 if (real_uid == root_uid)
1493 /* If neither the original real uid nor the original euid was root, Exim is
1494 running in an unprivileged state. */
1496 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1498 /* Scan the program's arguments. Some can be dealt with right away; others are
1499 simply recorded for checking and handling afterwards. Do a high-level switch
1500 on the second character (the one after '-'), to save some effort. */
1502 for (i = 1; i < argc; i++)
1504 BOOL badarg = FALSE;
1505 uschar *arg = argv[i];
1509 /* An argument not starting with '-' is the start of a recipients list;
1510 break out of the options-scanning loop. */
1518 /* An option consistion of -- terminates the options */
1520 if (Ustrcmp(arg, "--") == 0)
1522 recipients_arg = i + 1;
1526 /* Handle flagged options */
1528 switchchar = arg[1];
1531 /* Make all -ex options synonymous with -oex arguments, since that
1532 is assumed by various callers. Also make -qR options synonymous with -R
1533 options, as that seems to be required as well. Allow for -qqR too, and
1534 the same for -S options. */
1536 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1537 Ustrncmp(arg+1, "qR", 2) == 0 ||
1538 Ustrncmp(arg+1, "qS", 2) == 0)
1540 switchchar = arg[2];
1543 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1545 switchchar = arg[3];
1547 queue_2stage = TRUE;
1550 /* Make -r synonymous with -f, since it is a documented alias */
1552 else if (arg[1] == 'r') switchchar = 'f';
1554 /* Make -ov synonymous with -v */
1556 else if (Ustrcmp(arg, "-ov") == 0)
1562 /* deal with --option_aliases */
1563 else if (switchchar == '-')
1565 if (Ustrcmp(argrest, "help") == 0)
1567 usage_wanted = TRUE;
1570 else if (Ustrcmp(argrest, "version") == 0)
1577 /* High-level switch on active initial letter */
1581 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1582 so has no need of it. */
1585 if (*argrest == 0) i++; /* Skip over the type */
1590 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1592 /* -bd: Run in daemon mode, awaiting SMTP connections.
1593 -bdf: Ditto, but in the foreground.
1596 if (*argrest == 'd')
1598 daemon_listen = TRUE;
1599 if (*(++argrest) == 'f') background_daemon = FALSE;
1600 else if (*argrest != 0) { badarg = TRUE; break; }
1603 /* -be: Run in expansion test mode
1604 -bem: Ditto, but read a message from a file first
1607 else if (*argrest == 'e')
1609 expansion_test = checking = TRUE;
1610 if (argrest[1] == 'm')
1612 if (++i >= argc) { badarg = TRUE; break; }
1613 expansion_test_message = argv[i];
1616 if (argrest[1] != 0) { badarg = TRUE; break; }
1619 /* -bF: Run system filter test */
1621 else if (*argrest == 'F')
1623 filter_test |= FTEST_SYSTEM;
1624 if (*(++argrest) != 0) { badarg = TRUE; break; }
1625 if (++i < argc) filter_test_sfile = argv[i]; else
1627 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1632 /* -bf: Run user filter test
1633 -bfd: Set domain for filter testing
1634 -bfl: Set local part for filter testing
1635 -bfp: Set prefix for filter testing
1636 -bfs: Set suffix for filter testing
1639 else if (*argrest == 'f')
1641 if (*(++argrest) == 0)
1643 filter_test |= FTEST_USER;
1644 if (++i < argc) filter_test_ufile = argv[i]; else
1646 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1654 fprintf(stderr, "exim: string expected after %s\n", arg);
1657 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1658 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1659 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1660 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1661 else { badarg = TRUE; break; }
1665 /* -bh: Host checking - an IP address must follow. */
1667 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1669 if (++i >= argc) { badarg = TRUE; break; }
1670 sender_host_address = argv[i];
1671 host_checking = checking = log_testing_mode = TRUE;
1672 host_checking_callout = argrest[1] == 'c';
1675 /* -bi: This option is used by sendmail to initialize *the* alias file,
1676 though it has the -oA option to specify a different file. Exim has no
1677 concept of *the* alias file, but since Sun's YP make script calls
1678 sendmail this way, some support must be provided. */
1680 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1682 /* -bm: Accept and deliver message - the default option. Reinstate
1683 receiving_message, which got turned off for all -b options. */
1685 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1687 /* -bmalware: test the filename given for malware */
1689 else if (Ustrcmp(argrest, "malware") == 0)
1691 if (++i >= argc) { badarg = TRUE; break; }
1692 malware_test_file = argv[i];
1695 /* -bnq: For locally originating messages, do not qualify unqualified
1696 addresses. In the envelope, this causes errors; in header lines they
1699 else if (Ustrcmp(argrest, "nq") == 0)
1701 allow_unqualified_sender = FALSE;
1702 allow_unqualified_recipient = FALSE;
1705 /* -bpxx: List the contents of the mail queue, in various forms. If
1706 the option is -bpc, just a queue count is needed. Otherwise, if the
1707 first letter after p is r, then order is random. */
1709 else if (*argrest == 'p')
1711 if (*(++argrest) == 'c')
1714 if (*(++argrest) != 0) badarg = TRUE;
1718 if (*argrest == 'r')
1720 list_queue_option = 8;
1723 else list_queue_option = 0;
1727 /* -bp: List the contents of the mail queue, top-level only */
1729 if (*argrest == 0) {}
1731 /* -bpu: List the contents of the mail queue, top-level undelivered */
1733 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1735 /* -bpa: List the contents of the mail queue, including all delivered */
1737 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1739 /* Unknown after -bp[r] */
1749 /* -bP: List the configuration variables given as the address list.
1750 Force -v, so configuration errors get displayed. */
1752 else if (Ustrcmp(argrest, "P") == 0)
1754 list_options = TRUE;
1755 debug_selector |= D_v;
1756 debug_file = stderr;
1759 /* -brt: Test retry configuration lookup */
1761 else if (Ustrcmp(argrest, "rt") == 0)
1763 test_retry_arg = i + 1;
1767 /* -brw: Test rewrite configuration */
1769 else if (Ustrcmp(argrest, "rw") == 0)
1771 test_rewrite_arg = i + 1;
1775 /* -bS: Read SMTP commands on standard input, but produce no replies -
1776 all errors are reported by sending messages. */
1778 else if (Ustrcmp(argrest, "S") == 0)
1779 smtp_input = smtp_batched_input = receiving_message = TRUE;
1781 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1782 on standard output. */
1784 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1786 /* -bt: address testing mode */
1788 else if (Ustrcmp(argrest, "t") == 0)
1789 address_test_mode = checking = log_testing_mode = TRUE;
1791 /* -bv: verify addresses */
1793 else if (Ustrcmp(argrest, "v") == 0)
1794 verify_address_mode = checking = log_testing_mode = TRUE;
1796 /* -bvs: verify sender addresses */
1798 else if (Ustrcmp(argrest, "vs") == 0)
1800 verify_address_mode = checking = log_testing_mode = TRUE;
1801 verify_as_sender = TRUE;
1804 /* -bV: Print version string and support details */
1806 else if (Ustrcmp(argrest, "V") == 0)
1808 printf("Exim version %s #%s built %s\n", version_string,
1809 version_cnumber, version_date);
1810 printf("%s\n", CS version_copyright);
1811 version_printed = TRUE;
1812 show_whats_supported(stdout);
1819 /* -C: change configuration file list; ignore if it isn't really
1820 a change! Enforce a prefix check if required. */
1825 if(++i < argc) argrest = argv[i]; else
1826 { badarg = TRUE; break; }
1828 if (Ustrcmp(config_main_filelist, argrest) != 0)
1830 #ifdef ALT_CONFIG_PREFIX
1832 int len = Ustrlen(ALT_CONFIG_PREFIX);
1833 uschar *list = argrest;
1835 while((filename = string_nextinlist(&list, &sep, big_buffer,
1836 big_buffer_size)) != NULL)
1838 if ((Ustrlen(filename) < len ||
1839 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1840 Ustrstr(filename, "/../") != NULL) &&
1841 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1843 fprintf(stderr, "-C Permission denied\n");
1848 if (real_uid != root_uid)
1850 #ifdef TRUSTED_CONFIG_PREFIX_LIST
1852 if (Ustrstr(argrest, "/../"))
1853 trusted_config = FALSE;
1856 FILE *trust_list = Ufopen(TRUSTED_CONFIG_PREFIX_LIST, "rb");
1859 struct stat statbuf;
1861 if (fstat(fileno(trust_list), &statbuf) != 0 ||
1862 (statbuf.st_uid != root_uid /* owner not root */
1863 #ifdef CONFIGURE_OWNER
1864 && statbuf.st_uid != config_uid /* owner not the special one */
1867 (statbuf.st_gid != root_gid /* group not root */
1868 #ifdef CONFIGURE_GROUP
1869 && statbuf.st_gid != config_gid /* group not the special one */
1871 && (statbuf.st_mode & 020) != 0 /* group writeable */
1873 (statbuf.st_mode & 2) != 0) /* world writeable */
1875 trusted_config = FALSE;
1880 /* Well, the trust list at least is up to scratch... */
1881 void *reset_point = store_get(0);
1882 uschar *trusted_prefixes[32];
1883 int nr_prefixes = 0;
1886 while (Ufgets(big_buffer, big_buffer_size, trust_list))
1888 uschar *start = big_buffer, *nl;
1889 while (*start && isspace(*start))
1893 nl = Ustrchr(start, '\n');
1896 trusted_prefixes[nr_prefixes++] = string_copy(start);
1897 if (nr_prefixes == 32)
1905 uschar *list = argrest;
1907 while (trusted_config && (filename = string_nextinlist(&list,
1908 &sep, big_buffer, big_buffer_size)) != NULL)
1910 for (i=0; i < nr_prefixes; i++)
1912 int len = Ustrlen(trusted_prefixes[i]);
1913 if (Ustrlen(filename) >= len &&
1914 Ustrncmp(filename, trusted_prefixes[i], len) == 0)
1917 if (i == nr_prefixes)
1919 trusted_config = FALSE;
1926 /* No valid prefixes found in trust_list file. */
1927 trusted_config = FALSE;
1933 /* Could not open trust_list file. */
1934 trusted_config = FALSE;
1938 /* Not root; don't trust config */
1939 trusted_config = FALSE;
1943 config_main_filelist = argrest;
1944 config_changed = TRUE;
1949 /* -D: set up a macro definition */
1952 #ifdef DISABLE_D_OPTION
1953 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1958 macro_item *mlast = NULL;
1961 uschar *s = argrest;
1963 while (isspace(*s)) s++;
1965 if (*s < 'A' || *s > 'Z')
1967 fprintf(stderr, "exim: macro name set by -D must start with "
1968 "an upper case letter\n");
1972 while (isalnum(*s) || *s == '_')
1974 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1978 if (ptr == 0) { badarg = TRUE; break; }
1979 while (isspace(*s)) s++;
1982 if (*s++ != '=') { badarg = TRUE; break; }
1983 while (isspace(*s)) s++;
1986 for (m = macros; m != NULL; m = m->next)
1988 if (Ustrcmp(m->name, name) == 0)
1990 fprintf(stderr, "exim: duplicated -D in command line\n");
1996 m = store_get(sizeof(macro_item) + Ustrlen(name));
1998 m->command_line = TRUE;
1999 if (mlast == NULL) macros = m; else mlast->next = m;
2000 Ustrcpy(m->name, name);
2001 m->replacement = string_copy(s);
2003 if (clmacro_count >= MAX_CLMACROS)
2005 fprintf(stderr, "exim: too many -D options on command line\n");
2008 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2014 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2015 The latter is now a no-op, retained for compatibility only. If -dd is used,
2016 debugging subprocesses of the daemon is disabled. */
2019 if (Ustrcmp(argrest, "ropcr") == 0)
2021 /* drop_cr = TRUE; */
2024 /* Use an intermediate variable so that we don't set debugging while
2025 decoding the debugging bits. */
2029 unsigned int selector = D_default;
2032 if (*argrest == 'd')
2034 debug_daemon = TRUE;
2038 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2039 debug_options_count, US"debug", 0);
2040 debug_selector = selector;
2045 /* -E: This is a local error message. This option is not intended for
2046 external use at all, but is not restricted to trusted callers because it
2047 does no harm (just suppresses certain error messages) and if Exim is run
2048 not setuid root it won't always be trusted when it generates error
2049 messages using this option. If there is a message id following -E, point
2050 message_reference at it, for logging. */
2053 local_error_message = TRUE;
2054 if (mac_ismsgid(argrest)) message_reference = argrest;
2058 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2059 option, so it looks as if historically the -oex options are also callable
2060 without the leading -o. So we have to accept them. Before the switch,
2061 anything starting -oe has been converted to -e. Exim does not support all
2062 of the sendmail error options. */
2065 if (Ustrcmp(argrest, "e") == 0)
2067 arg_error_handling = ERRORS_SENDER;
2068 errors_sender_rc = EXIT_SUCCESS;
2070 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2071 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2072 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2073 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2078 /* -F: Set sender's full name, used instead of the gecos entry from
2079 the password file. Since users can usually alter their gecos entries,
2080 there's no security involved in using this instead. The data can follow
2081 the -F or be in the next argument. */
2086 if(++i < argc) argrest = argv[i]; else
2087 { badarg = TRUE; break; }
2089 originator_name = argrest;
2090 sender_name_forced = TRUE;
2094 /* -f: Set sender's address - this value is only actually used if Exim is
2095 run by a trusted user, or if untrusted_set_sender is set and matches the
2096 address, except that the null address can always be set by any user. The
2097 test for this happens later, when the value given here is ignored when not
2098 permitted. For an untrusted user, the actual sender is still put in Sender:
2099 if it doesn't match the From: header (unless no_local_from_check is set).
2100 The data can follow the -f or be in the next argument. The -r switch is an
2101 obsolete form of -f but since there appear to be programs out there that
2102 use anything that sendmail has ever supported, better accept it - the
2103 synonymizing is done before the switch above.
2105 At this stage, we must allow domain literal addresses, because we don't
2106 know what the setting of allow_domain_literals is yet. Ditto for trailing
2107 dots and strip_trailing_dot. */
2115 if (i+1 < argc) argrest = argv[++i]; else
2116 { badarg = TRUE; break; }
2120 sender_address = string_sprintf(""); /* Ensure writeable memory */
2124 uschar *temp = argrest + Ustrlen(argrest) - 1;
2125 while (temp >= argrest && isspace(*temp)) temp--;
2126 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2127 allow_domain_literals = TRUE;
2128 strip_trailing_dot = TRUE;
2129 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2130 &sender_address_domain, TRUE);
2131 allow_domain_literals = FALSE;
2132 strip_trailing_dot = FALSE;
2133 if (sender_address == NULL)
2135 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2136 return EXIT_FAILURE;
2139 sender_address_forced = TRUE;
2143 /* This is some Sendmail thing which can be ignored */
2148 /* -h: Set the hop count for an incoming message. Exim does not currently
2149 support this; it always computes it by counting the Received: headers.
2150 To put it in will require a change to the spool header file format. */
2155 if(++i < argc) argrest = argv[i]; else
2156 { badarg = TRUE; break; }
2158 if (!isdigit(*argrest)) badarg = TRUE;
2162 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2163 not to be documented for sendmail but mailx (at least) uses it) */
2166 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2171 receiving_message = FALSE;
2173 /* -MC: continue delivery of another message via an existing open
2174 file descriptor. This option is used for an internal call by the
2175 smtp transport when there is a pending message waiting to go to an
2176 address to which it has got a connection. Five subsequent arguments are
2177 required: transport name, host name, IP address, sequence number, and
2178 message_id. Transports may decline to create new processes if the sequence
2179 number gets too big. The channel is stdin. This (-MC) must be the last
2180 argument. There's a subsequent check that the real-uid is privileged.
2182 If we are running in the test harness. delay for a bit, to let the process
2183 that set this one up complete. This makes for repeatability of the logging,
2186 if (Ustrcmp(argrest, "C") == 0)
2188 union sockaddr_46 interface_sock;
2189 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2193 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2194 return EXIT_FAILURE;
2197 if (msg_action_arg >= 0)
2199 fprintf(stderr, "exim: incompatible arguments\n");
2200 return EXIT_FAILURE;
2203 continue_transport = argv[++i];
2204 continue_hostname = argv[++i];
2205 continue_host_address = argv[++i];
2206 continue_sequence = Uatoi(argv[++i]);
2207 msg_action = MSG_DELIVER;
2208 msg_action_arg = ++i;
2209 forced_delivery = TRUE;
2210 queue_run_pid = passed_qr_pid;
2211 queue_run_pipe = passed_qr_pipe;
2213 if (!mac_ismsgid(argv[i]))
2215 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2217 return EXIT_FAILURE;
2220 /* Set up $sending_ip_address and $sending_port */
2222 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2224 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2228 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2230 return EXIT_FAILURE;
2233 if (running_in_test_harness) millisleep(500);
2237 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2238 precedes -MC (see above). The flag indicates that the host to which
2239 Exim is connected has accepted an AUTH sequence. */
2241 else if (Ustrcmp(argrest, "CA") == 0)
2243 smtp_authenticated = TRUE;
2247 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2248 it preceded -MC (see above) */
2250 else if (Ustrcmp(argrest, "CP") == 0)
2252 smtp_use_pipelining = TRUE;
2256 /* -MCQ: pass on the pid of the queue-running process that started
2257 this chain of deliveries and the fd of its synchronizing pipe; this
2258 is useful only when it precedes -MC (see above) */
2260 else if (Ustrcmp(argrest, "CQ") == 0)
2262 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2264 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2269 /* -MCS: set the smtp_use_size flag; this is useful only when it
2270 precedes -MC (see above) */
2272 else if (Ustrcmp(argrest, "CS") == 0)
2274 smtp_use_size = TRUE;
2278 /* -MCT: set the tls_offered flag; this is useful only when it
2279 precedes -MC (see above). The flag indicates that the host to which
2280 Exim is connected has offered TLS support. */
2283 else if (Ustrcmp(argrest, "CT") == 0)
2290 /* -M[x]: various operations on the following list of message ids:
2291 -M deliver the messages, ignoring next retry times and thawing
2292 -Mc deliver the messages, checking next retry times, no thawing
2293 -Mf freeze the messages
2294 -Mg give up on the messages
2295 -Mt thaw the messages
2296 -Mrm remove the messages
2297 In the above cases, this must be the last option. There are also the
2298 following options which are followed by a single message id, and which
2299 act on that message. Some of them use the "recipient" addresses as well.
2300 -Mar add recipient(s)
2301 -Mmad mark all recipients delivered
2302 -Mmd mark recipients(s) delivered
2304 -Mset load a message for use with -be
2306 -Mvc show copy (of whole message, in RFC 2822 format)
2311 else if (*argrest == 0)
2313 msg_action = MSG_DELIVER;
2314 forced_delivery = deliver_force_thaw = TRUE;
2316 else if (Ustrcmp(argrest, "ar") == 0)
2318 msg_action = MSG_ADD_RECIPIENT;
2319 one_msg_action = TRUE;
2321 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2322 else if (Ustrcmp(argrest, "es") == 0)
2324 msg_action = MSG_EDIT_SENDER;
2325 one_msg_action = TRUE;
2327 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2328 else if (Ustrcmp(argrest, "g") == 0)
2330 msg_action = MSG_DELIVER;
2331 deliver_give_up = TRUE;
2333 else if (Ustrcmp(argrest, "mad") == 0)
2335 msg_action = MSG_MARK_ALL_DELIVERED;
2337 else if (Ustrcmp(argrest, "md") == 0)
2339 msg_action = MSG_MARK_DELIVERED;
2340 one_msg_action = TRUE;
2342 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2343 else if (Ustrcmp(argrest, "set") == 0)
2345 msg_action = MSG_LOAD;
2346 one_msg_action = TRUE;
2348 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2349 else if (Ustrcmp(argrest, "vb") == 0)
2351 msg_action = MSG_SHOW_BODY;
2352 one_msg_action = TRUE;
2354 else if (Ustrcmp(argrest, "vc") == 0)
2356 msg_action = MSG_SHOW_COPY;
2357 one_msg_action = TRUE;
2359 else if (Ustrcmp(argrest, "vh") == 0)
2361 msg_action = MSG_SHOW_HEADER;
2362 one_msg_action = TRUE;
2364 else if (Ustrcmp(argrest, "vl") == 0)
2366 msg_action = MSG_SHOW_LOG;
2367 one_msg_action = TRUE;
2369 else { badarg = TRUE; break; }
2371 /* All the -Mxx options require at least one message id. */
2373 msg_action_arg = i + 1;
2374 if (msg_action_arg >= argc)
2376 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2377 return EXIT_FAILURE;
2380 /* Some require only message ids to follow */
2382 if (!one_msg_action)
2385 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2387 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2389 return EXIT_FAILURE;
2391 goto END_ARG; /* Remaining args are ids */
2394 /* Others require only one message id, possibly followed by addresses,
2395 which will be handled as normal arguments. */
2399 if (!mac_ismsgid(argv[msg_action_arg]))
2401 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2402 argv[msg_action_arg], arg);
2403 return EXIT_FAILURE;
2410 /* Some programs seem to call the -om option without the leading o;
2411 for sendmail it askes for "me too". Exim always does this. */
2414 if (*argrest != 0) badarg = TRUE;
2418 /* -N: don't do delivery - a debugging option that stops transports doing
2419 their thing. It implies debugging at the D_v level. */
2424 dont_deliver = TRUE;
2425 debug_selector |= D_v;
2426 debug_file = stderr;
2432 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2438 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2439 option to the specified value. This form uses long names. We need to handle
2440 -O option=value and -Ooption=value. */
2447 fprintf(stderr, "exim: string expected after -O\n");
2455 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2458 if (*argrest == 'A')
2460 alias_arg = argrest + 1;
2461 if (alias_arg[0] == 0)
2463 if (i+1 < argc) alias_arg = argv[++i]; else
2465 fprintf(stderr, "exim: string expected after -oA\n");
2471 /* -oB: Set a connection message max value for remote deliveries */
2473 else if (*argrest == 'B')
2475 uschar *p = argrest + 1;
2478 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2480 connection_max_messages = 1;
2489 fprintf(stderr, "exim: number expected after -oB\n");
2492 connection_max_messages = Uatoi(p);
2496 /* -odb: background delivery */
2498 else if (Ustrcmp(argrest, "db") == 0)
2500 synchronous_delivery = FALSE;
2501 arg_queue_only = FALSE;
2502 queue_only_set = TRUE;
2505 /* -odf: foreground delivery (smail-compatible option); same effect as
2506 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2509 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2511 synchronous_delivery = TRUE;
2512 arg_queue_only = FALSE;
2513 queue_only_set = TRUE;
2516 /* -odq: queue only */
2518 else if (Ustrcmp(argrest, "dq") == 0)
2520 synchronous_delivery = FALSE;
2521 arg_queue_only = TRUE;
2522 queue_only_set = TRUE;
2525 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2526 but no remote delivery */
2528 else if (Ustrcmp(argrest, "dqs") == 0)
2531 arg_queue_only = FALSE;
2532 queue_only_set = TRUE;
2535 /* -oex: Sendmail error flags. As these are also accepted without the
2536 leading -o prefix, for compatibility with vacation and other callers,
2537 they are handled with -e above. */
2539 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2540 -oitrue: Another sendmail syntax for the same */
2542 else if (Ustrcmp(argrest, "i") == 0 ||
2543 Ustrcmp(argrest, "itrue") == 0)
2546 /* -oM*: Set various characteristics for an incoming message; actually
2547 acted on for trusted callers only. */
2549 else if (*argrest == 'M')
2553 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2557 /* -oMa: Set sender host address */
2559 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2561 /* -oMaa: Set authenticator name */
2563 else if (Ustrcmp(argrest, "Maa") == 0)
2564 sender_host_authenticated = argv[++i];
2566 /* -oMas: setting authenticated sender */
2568 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2570 /* -oMai: setting authenticated id */
2572 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2574 /* -oMi: Set incoming interface address */
2576 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2578 /* -oMr: Received protocol */
2580 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2582 /* -oMs: Set sender host name */
2584 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2586 /* -oMt: Set sender ident */
2588 else if (Ustrcmp(argrest, "Mt") == 0)
2590 sender_ident_set = TRUE;
2591 sender_ident = argv[++i];
2594 /* Else a bad argument */
2603 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2604 seem to call this as -m (undocumented), so that is also accepted (see
2607 else if (Ustrcmp(argrest, "m") == 0) {}
2609 /* -oo: An ancient flag for old-style addresses which still seems to
2610 crop up in some calls (see in SCO). */
2612 else if (Ustrcmp(argrest, "o") == 0) {}
2614 /* -oP <name>: set pid file path for daemon */
2616 else if (Ustrcmp(argrest, "P") == 0)
2617 override_pid_file_path = argv[++i];
2619 /* -or <n>: set timeout for non-SMTP acceptance
2620 -os <n>: set timeout for SMTP acceptance */
2622 else if (*argrest == 'r' || *argrest == 's')
2624 int *tp = (*argrest == 'r')?
2625 &arg_receive_timeout : &arg_smtp_receive_timeout;
2626 if (argrest[1] == 0)
2628 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2630 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2633 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2638 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2640 else if (Ustrcmp(argrest, "X") == 0)
2641 override_local_interfaces = argv[++i];
2643 /* Unknown -o argument */
2649 /* -ps: force Perl startup; -pd force delayed Perl startup */
2653 if (*argrest == 's' && argrest[1] == 0)
2655 perl_start_option = 1;
2658 if (*argrest == 'd' && argrest[1] == 0)
2660 perl_start_option = -1;
2665 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2666 which sets the host protocol and host name */
2670 if (i+1 < argc) argrest = argv[++i]; else
2671 { badarg = TRUE; break; }
2676 uschar *hn = Ustrchr(argrest, ':');
2679 received_protocol = argrest;
2683 received_protocol = string_copyn(argrest, hn - argrest);
2684 sender_host_name = hn + 1;
2691 receiving_message = FALSE;
2692 if (queue_interval >= 0)
2694 fprintf(stderr, "exim: -q specified more than once\n");
2698 /* -qq...: Do queue runs in a 2-stage manner */
2700 if (*argrest == 'q')
2702 queue_2stage = TRUE;
2706 /* -qi...: Do only first (initial) deliveries */
2708 if (*argrest == 'i')
2710 queue_run_first_delivery = TRUE;
2714 /* -qf...: Run the queue, forcing deliveries
2715 -qff..: Ditto, forcing thawing as well */
2717 if (*argrest == 'f')
2719 queue_run_force = TRUE;
2720 if (*(++argrest) == 'f')
2722 deliver_force_thaw = TRUE;
2727 /* -q[f][f]l...: Run the queue only on local deliveries */
2729 if (*argrest == 'l')
2731 queue_run_local = TRUE;
2735 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2736 optionally starting from a given message id. */
2738 if (*argrest == 0 &&
2739 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2742 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2743 start_queue_run_id = argv[++i];
2744 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2745 stop_queue_run_id = argv[++i];
2748 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2749 optionally local only. */
2754 queue_interval = readconf_readtime(argrest, 0, FALSE);
2756 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2757 if (queue_interval <= 0)
2759 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2766 case 'R': /* Synonymous with -qR... */
2767 receiving_message = FALSE;
2769 /* -Rf: As -R (below) but force all deliveries,
2770 -Rff: Ditto, but also thaw all frozen messages,
2771 -Rr: String is regex
2772 -Rrf: Regex and force
2773 -Rrff: Regex and force and thaw
2775 in all cases provided there are no further characters in this
2781 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2783 if (Ustrcmp(argrest, rsopts[i]) == 0)
2785 if (i != 2) queue_run_force = TRUE;
2786 if (i >= 2) deliver_selectstring_regex = TRUE;
2787 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2788 argrest += Ustrlen(rsopts[i]);
2793 /* -R: Set string to match in addresses for forced queue run to
2794 pick out particular messages. */
2798 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2800 fprintf(stderr, "exim: string expected after -R\n");
2804 else deliver_selectstring = argrest;
2808 /* -r: an obsolete synonym for -f (see above) */
2811 /* -S: Like -R but works on sender. */
2813 case 'S': /* Synonymous with -qS... */
2814 receiving_message = FALSE;
2816 /* -Sf: As -S (below) but force all deliveries,
2817 -Sff: Ditto, but also thaw all frozen messages,
2818 -Sr: String is regex
2819 -Srf: Regex and force
2820 -Srff: Regex and force and thaw
2822 in all cases provided there are no further characters in this
2828 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2830 if (Ustrcmp(argrest, rsopts[i]) == 0)
2832 if (i != 2) queue_run_force = TRUE;
2833 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2834 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2835 argrest += Ustrlen(rsopts[i]);
2840 /* -S: Set string to match in addresses for forced queue run to
2841 pick out particular messages. */
2845 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2847 fprintf(stderr, "exim: string expected after -S\n");
2851 else deliver_selectstring_sender = argrest;
2854 /* -Tqt is an option that is exclusively for use by the testing suite.
2855 It is not recognized in other circumstances. It allows for the setting up
2856 of explicit "queue times" so that various warning/retry things can be
2857 tested. Otherwise variability of clock ticks etc. cause problems. */
2860 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2861 fudged_queue_times = argv[++i];
2866 /* -t: Set flag to extract recipients from body of message. */
2869 if (*argrest == 0) extract_recipients = TRUE;
2871 /* -ti: Set flag to extract recipients from body of message, and also
2872 specify that dot does not end the message. */
2874 else if (Ustrcmp(argrest, "i") == 0)
2876 extract_recipients = TRUE;
2880 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2883 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2890 /* -U: This means "initial user submission" in sendmail, apparently. The
2891 doc claims that in future sendmail may refuse syntactically invalid
2892 messages instead of fixing them. For the moment, we just ignore it. */
2898 /* -v: verify things - this is a very low-level debugging */
2903 debug_selector |= D_v;
2904 debug_file = stderr;
2910 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2912 The -x flag tells the sendmail command that mail from a local
2913 mail program has National Language Support (NLS) extended characters
2914 in the body of the mail item. The sendmail command can send mail with
2915 extended NLS characters across networks that normally corrupts these
2918 As Exim is 8-bit clean, it just ignores this flag. */
2921 if (*argrest != 0) badarg = TRUE;
2924 /* All other initial characters are errors */
2929 } /* End of high-level switch statement */
2931 /* Failed to recognize the option, or syntax error */
2935 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2936 "option %s\n", arg);
2942 /* If -R or -S have been specified without -q, assume a single queue run. */
2944 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2945 queue_interval < 0) queue_interval = 0;
2949 /* If usage_wanted is set we call the usage function - which never returns */
2950 if (usage_wanted) exim_usage(called_as);
2952 /* Arguments have been processed. Check for incompatibilities. */
2954 (smtp_input || extract_recipients || recipients_arg < argc) &&
2955 (daemon_listen || queue_interval >= 0 || bi_option ||
2956 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2957 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2960 msg_action_arg > 0 &&
2961 (daemon_listen || queue_interval >= 0 || list_options ||
2962 (checking && msg_action != MSG_LOAD) ||
2963 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2966 (daemon_listen || queue_interval >= 0) &&
2967 (sender_address != NULL || list_options || list_queue || checking ||
2971 daemon_listen && queue_interval == 0
2975 (checking || smtp_input || extract_recipients ||
2976 filter_test != FTEST_NONE || bi_option)
2979 verify_address_mode &&
2980 (address_test_mode || smtp_input || extract_recipients ||
2981 filter_test != FTEST_NONE || bi_option)
2984 address_test_mode && (smtp_input || extract_recipients ||
2985 filter_test != FTEST_NONE || bi_option)
2988 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2992 deliver_selectstring != NULL && queue_interval < 0
2995 msg_action == MSG_LOAD &&
2996 (!expansion_test || expansion_test_message != NULL)
3000 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3004 /* If debugging is set up, set the file and the file descriptor to pass on to
3005 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3006 to run in the foreground. */
3008 if (debug_selector != 0)
3010 debug_file = stderr;
3011 debug_fd = fileno(debug_file);
3012 background_daemon = FALSE;
3013 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3014 if (debug_selector != D_v) /* -v only doesn't show this */
3016 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3017 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3019 show_whats_supported(stderr);
3023 /* When started with root privilege, ensure that the limits on the number of
3024 open files and the number of processes (where that is accessible) are
3025 sufficiently large, or are unset, in case Exim has been called from an
3026 environment where the limits are screwed down. Not all OS have the ability to
3027 change some of these limits. */
3031 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3037 #ifdef RLIMIT_NOFILE
3038 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3040 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3042 rlp.rlim_cur = rlp.rlim_max = 0;
3045 /* I originally chose 1000 as a nice big number that was unlikely to
3046 be exceeded. It turns out that some older OS have a fixed upper limit of
3049 if (rlp.rlim_cur < 1000)
3051 rlp.rlim_cur = rlp.rlim_max = 1000;
3052 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3054 rlp.rlim_cur = rlp.rlim_max = 256;
3055 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3056 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3063 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3065 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3067 rlp.rlim_cur = rlp.rlim_max = 0;
3070 #ifdef RLIM_INFINITY
3071 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3073 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3075 if (rlp.rlim_cur < 1000)
3077 rlp.rlim_cur = rlp.rlim_max = 1000;
3079 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3080 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3086 /* Exim is normally entered as root (but some special configurations are
3087 possible that don't do this). However, it always spins off sub-processes that
3088 set their uid and gid as required for local delivery. We don't want to pass on
3089 any extra groups that root may belong to, so we want to get rid of them all at
3092 We need to obey setgroups() at this stage, before possibly giving up root
3093 privilege for a changed configuration file, but later on we might need to
3094 check on the additional groups for the admin user privilege - can't do that
3095 till after reading the config, which might specify the exim gid. Therefore,
3096 save the group list here first. */
3098 group_count = getgroups(NGROUPS_MAX, group_list);
3100 /* There is a fundamental difference in some BSD systems in the matter of
3101 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3102 known not to be different. On the "different" systems there is a single group
3103 list, and the first entry in it is the current group. On all other versions of
3104 Unix there is a supplementary group list, which is in *addition* to the current
3105 group. Consequently, to get rid of all extraneous groups on a "standard" system
3106 you pass over 0 groups to setgroups(), while on a "different" system you pass
3107 over a single group - the current group, which is always the first group in the
3108 list. Calling setgroups() with zero groups on a "different" system results in
3109 an error return. The following code should cope with both types of system.
3111 However, if this process isn't running as root, setgroups() can't be used
3112 since you have to be root to run it, even if throwing away groups. Not being
3113 root here happens only in some unusual configurations. We just ignore the
3116 if (setgroups(0, NULL) != 0)
3118 if (setgroups(1, group_list) != 0 && !unprivileged)
3120 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3125 /* If the configuration file name has been altered by an argument on the
3126 command line (either a new file name or a macro definition) and the caller is
3127 not root, or if this is a filter testing run, remove any setuid privilege the
3128 program has and run as the underlying user.
3130 The exim user is locked out of this, which severely restricts the use of -C
3133 Otherwise, set the real ids to the effective values (should be root unless run
3134 from inetd, which it can either be root or the exim uid, if one is configured).
3136 There is a private mechanism for bypassing some of this, in order to make it
3137 possible to test lots of configurations automatically, without having either to
3138 recompile each time, or to patch in an actual configuration file name and other
3139 values (such as the path name). If running in the test harness, pretend that
3140 configuration file changes and macro definitions haven't happened. */
3143 (!trusted_config || macros != NULL) && /* Config changed, and */
3144 real_uid != root_uid && /* Not root, and */
3145 !running_in_test_harness /* Not fudged */
3147 expansion_test /* expansion testing */
3149 filter_test != FTEST_NONE) /* Filter testing */
3151 setgroups(group_count, group_list);
3152 exim_setugid(real_uid, real_gid, FALSE,
3153 US"-C, -D, -be or -bf forces real uid");
3154 removed_privilege = TRUE;
3156 /* In the normal case when Exim is called like this, stderr is available
3157 and should be used for any logging information because attempts to write
3158 to the log will usually fail. To arrange this, we unset really_exim. However,
3159 if no stderr is available there is no point - we might as well have a go
3160 at the log (if it fails, syslog will be written). */
3162 if (log_stderr != NULL) really_exim = FALSE;
3165 /* Privilege is to be retained for the moment. It may be dropped later,
3166 depending on the job that this Exim process has been asked to do. For now, set
3167 the real uid to the effective so that subsequent re-execs of Exim are done by a
3170 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3172 /* If testing a filter, open the file(s) now, before wasting time doing other
3173 setups and reading the message. */
3175 if ((filter_test & FTEST_SYSTEM) != 0)
3177 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3180 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3182 return EXIT_FAILURE;
3186 if ((filter_test & FTEST_USER) != 0)
3188 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3191 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3193 return EXIT_FAILURE;
3197 /* Read the main runtime configuration data; this gives up if there
3198 is a failure. It leaves the configuration file open so that the subsequent
3199 configuration data for delivery can be read if needed. */
3203 /* Handle the decoding of logging options. */
3205 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3206 log_selector_string, log_options, log_options_count, US"log", 0);
3210 debug_printf("configuration file is %s\n", config_main_filename);
3211 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3212 log_extra_selector);
3215 /* If domain literals are not allowed, check the sender address that was
3216 supplied with -f. Ditto for a stripped trailing dot. */
3218 if (sender_address != NULL)
3220 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3222 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3223 "allowed\n", sender_address);
3224 return EXIT_FAILURE;
3226 if (f_end_dot && !strip_trailing_dot)
3228 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3229 "(trailing dot not allowed)\n", sender_address);
3230 return EXIT_FAILURE;
3234 /* Paranoia check of maximum lengths of certain strings. There is a check
3235 on the length of the log file path in log.c, which will come into effect
3236 if there are any calls to write the log earlier than this. However, if we
3237 get this far but the string is very long, it is better to stop now than to
3238 carry on and (e.g.) receive a message and then have to collapse. The call to
3239 log_write() from here will cause the ultimate panic collapse if the complete
3240 file name exceeds the buffer length. */
3242 if (Ustrlen(log_file_path) > 200)
3243 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3244 "log_file_path is longer than 200 chars: aborting");
3246 if (Ustrlen(pid_file_path) > 200)
3247 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3248 "pid_file_path is longer than 200 chars: aborting");
3250 if (Ustrlen(spool_directory) > 200)
3251 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3252 "spool_directory is longer than 200 chars: aborting");
3254 /* Length check on the process name given to syslog for its TAG field,
3255 which is only permitted to be 32 characters or less. See RFC 3164. */
3257 if (Ustrlen(syslog_processname) > 32)
3258 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3259 "syslog_processname is longer than 32 chars: aborting");
3261 /* In some operating systems, the environment variable TMPDIR controls where
3262 temporary files are created; Exim doesn't use these (apart from when delivering
3263 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3264 If TMPDIR is found in the environment, reset it to the value defined in the
3265 TMPDIR macro, if this macro is defined. */
3270 for (p = USS environ; *p != NULL; p++)
3272 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3273 Ustrcmp(*p+7, TMPDIR) != 0)
3275 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3276 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3278 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3284 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3285 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3286 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3287 called by a user who has set the TZ variable. This then affects the timestamps
3288 in log files and in Received: headers, and any created Date: header lines. The
3289 required timezone is settable in the configuration file, so nothing can be done
3290 about this earlier - but hopefully nothing will normally be logged earlier than
3291 this. We have to make a new environment if TZ is wrong, but don't bother if
3292 timestamps_utc is set, because then all times are in UTC anyway. */
3294 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3296 timestamps_utc = TRUE;
3300 uschar *envtz = US getenv("TZ");
3301 if ((envtz == NULL && timezone_string != NULL) ||
3303 (timezone_string == NULL ||
3304 Ustrcmp(timezone_string, envtz) != 0)))
3306 uschar **p = USS environ;
3310 while (*p++ != NULL) count++;
3311 if (envtz == NULL) count++;
3312 newp = new = malloc(sizeof(uschar *) * (count + 1));
3313 for (p = USS environ; *p != NULL; p++)
3315 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3318 if (timezone_string != NULL)
3320 *newp = malloc(Ustrlen(timezone_string) + 4);
3321 sprintf(CS *newp++, "TZ=%s", timezone_string);
3326 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3327 tod_stamp(tod_log));
3331 /* Handle the case when we have removed the setuid privilege because of -C or
3332 -D. This means that the caller of Exim was not root.
3334 There is a problem if we were running as the Exim user. The sysadmin may
3335 expect this case to retain privilege because "the binary was called by the
3336 Exim user", but it hasn't, because either the -D option set macros, or the
3337 -C option set a non-trusted configuration file. There are two possibilities:
3339 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3340 to do message deliveries. Thus, the fact that it is running as a
3341 non-privileged user is plausible, and might be wanted in some special
3342 configurations. However, really_exim will have been set false when
3343 privilege was dropped, to stop Exim trying to write to its normal log
3344 files. Therefore, re-enable normal log processing, assuming the sysadmin
3345 has set up the log directory correctly.
3347 (2) If deliver_drop_privilege is not set, the configuration won't work as
3348 apparently intended, and so we log a panic message. In order to retain
3349 root for -C or -D, the caller must either be root or be invoking a
3350 trusted configuration file (when deliver_drop_privilege is false). */
3352 if (removed_privilege && (!trusted_config || macros != NULL) &&
3353 real_uid == exim_uid)
3355 if (deliver_drop_privilege)
3356 really_exim = TRUE; /* let logging work normally */
3358 log_write(0, LOG_MAIN|LOG_PANIC,
3359 "exim user lost privilege for using %s option",
3360 (int)exim_uid, trusted_config? "-D" : "-C");
3363 /* Start up Perl interpreter if Perl support is configured and there is a
3364 perl_startup option, and the configuration or the command line specifies
3365 initializing starting. Note that the global variables are actually called
3366 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3369 if (perl_start_option != 0)
3370 opt_perl_at_start = (perl_start_option > 0);
3371 if (opt_perl_at_start && opt_perl_startup != NULL)
3374 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3375 errstr = init_perl(opt_perl_startup);
3378 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3379 return EXIT_FAILURE;
3381 opt_perl_started = TRUE;
3383 #endif /* EXIM_PERL */
3385 /* Log the arguments of the call if the configuration file said so. This is
3386 a debugging feature for finding out what arguments certain MUAs actually use.
3387 Don't attempt it if logging is disabled, or if listing variables or if
3388 verifying/testing addresses or expansions. */
3390 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3391 && really_exim && !list_options && !checking)
3394 uschar *p = big_buffer;
3396 (void)getcwd(CS p+4, big_buffer_size - 4);
3398 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3400 for (i = 0; i < argc; i++)
3402 int len = Ustrlen(argv[i]);
3405 if (p + len + 8 >= big_buffer + big_buffer_size)
3408 log_write(0, LOG_MAIN, "%s", big_buffer);
3409 Ustrcpy(big_buffer, "...");
3412 printing = string_printing(argv[i]);
3413 if (printing[0] == 0) quote = US"\""; else
3415 uschar *pp = printing;
3417 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3419 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3420 (p - big_buffer) - 4), printing, quote);
3424 if ((log_extra_selector & LX_arguments) != 0)
3425 log_write(0, LOG_MAIN, "%s", big_buffer);
3427 debug_printf("%s\n", big_buffer);
3430 /* Set the working directory to be the top-level spool directory. We don't rely
3431 on this in the code, which always uses fully qualified names, but it's useful
3432 for core dumps etc. Don't complain if it fails - the spool directory might not
3433 be generally accessible and calls with the -C option (and others) have lost
3434 privilege by now. Before the chdir, we try to ensure that the directory exists.
3437 if (Uchdir(spool_directory) != 0)
3439 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3440 (void)Uchdir(spool_directory);
3443 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3444 alias file. Exim doesn't have such a concept, but this call is screwed into
3445 Sun's YP makefiles. Handle this by calling a configured script, as the real
3446 user who called Exim. The -oA option can be used to pass an argument to the
3451 (void)fclose(config_file);
3452 if (bi_command != NULL)
3456 argv[i++] = bi_command;
3457 if (alias_arg != NULL) argv[i++] = alias_arg;
3460 setgroups(group_count, group_list);
3461 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3463 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3464 (argv[1] == NULL)? US"" : argv[1]);
3466 execv(CS argv[0], (char *const *)argv);
3467 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3472 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3477 /* If an action on specific messages is requested, or if a daemon or queue
3478 runner is being started, we need to know if Exim was called by an admin user.
3479 This is the case if the real user is root or exim, or if the real group is
3480 exim, or if one of the supplementary groups is exim or a group listed in
3481 admin_groups. We don't fail all message actions immediately if not admin_user,
3482 since some actions can be performed by non-admin users. Instead, set admin_user
3483 for later interrogation. */
3485 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3490 for (i = 0; i < group_count; i++)
3492 if (group_list[i] == exim_gid) admin_user = TRUE;
3493 else if (admin_groups != NULL)
3495 for (j = 1; j <= (int)(admin_groups[0]); j++)
3496 if (admin_groups[j] == group_list[i])
3497 { admin_user = TRUE; break; }
3499 if (admin_user) break;
3503 /* Another group of privileged users are the trusted users. These are root,
3504 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3505 are permitted to specify sender_addresses with -f on the command line, and
3506 other message parameters as well. */
3508 if (real_uid == root_uid || real_uid == exim_uid)
3509 trusted_caller = TRUE;
3514 if (trusted_users != NULL)
3516 for (i = 1; i <= (int)(trusted_users[0]); i++)
3517 if (trusted_users[i] == real_uid)
3518 { trusted_caller = TRUE; break; }
3521 if (!trusted_caller && trusted_groups != NULL)
3523 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3525 if (trusted_groups[i] == real_gid)
3526 trusted_caller = TRUE;
3527 else for (j = 0; j < group_count; j++)
3529 if (trusted_groups[i] == group_list[j])
3530 { trusted_caller = TRUE; break; }
3532 if (trusted_caller) break;
3537 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3538 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3540 /* Only an admin user may start the daemon or force a queue run in the default
3541 configuration, but the queue run restriction can be relaxed. Only an admin
3542 user may request that a message be returned to its sender forthwith. Only an
3543 admin user may specify a debug level greater than D_v (because it might show
3544 passwords, etc. in lookup queries). Only an admin user may request a queue
3545 count. Only an admin user can use the test interface to scan for email
3546 (because Exim will be in the spool dir and able to look at mails). */
3550 BOOL debugset = (debug_selector & ~D_v) != 0;
3551 if (deliver_give_up || daemon_listen || malware_test_file ||
3552 (count_queue && queue_list_requires_admin) ||
3553 (list_queue && queue_list_requires_admin) ||
3554 (queue_interval >= 0 && prod_requires_admin) ||
3555 (debugset && !running_in_test_harness))
3557 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3562 /* If the real user is not root or the exim uid, the argument for passing
3563 in an open TCP/IP connection for another message is not permitted, nor is
3564 running with the -N option for any delivery action, unless this call to exim is
3565 one that supplied an input message, or we are using a patched exim for
3566 regression testing. */
3568 if (real_uid != root_uid && real_uid != exim_uid &&
3569 (continue_hostname != NULL ||
3571 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3572 )) && !running_in_test_harness)
3574 fprintf(stderr, "exim: Permission denied\n");
3575 return EXIT_FAILURE;
3578 /* If the caller is not trusted, certain arguments are ignored when running for
3579 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3580 Note that authority for performing certain actions on messages is tested in the
3581 queue_action() function. */
3583 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3585 sender_host_name = sender_host_address = interface_address =
3586 sender_ident = received_protocol = NULL;
3587 sender_host_port = interface_port = 0;
3588 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3591 /* If a sender host address is set, extract the optional port number off the
3592 end of it and check its syntax. Do the same thing for the interface address.
3593 Exim exits if the syntax is bad. */
3597 if (sender_host_address != NULL)
3598 sender_host_port = check_port(sender_host_address);
3599 if (interface_address != NULL)
3600 interface_port = check_port(interface_address);
3603 /* If an SMTP message is being received check to see if the standard input is a
3604 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3605 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3610 union sockaddr_46 inetd_sock;
3611 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3612 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3614 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3615 if (family == AF_INET || family == AF_INET6)
3617 union sockaddr_46 interface_sock;
3618 size = sizeof(interface_sock);
3620 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3621 interface_address = host_ntoa(-1, &interface_sock, NULL,
3624 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3626 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3629 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3630 NULL, &sender_host_port);
3631 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3632 "inetd is not supported when mua_wrapper is set");
3637 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3638 return EXIT_FAILURE;
3644 /* If the load average is going to be needed while receiving a message, get it
3645 now for those OS that require the first call to os_getloadavg() to be done as
3646 root. There will be further calls later for each message received. */
3648 #ifdef LOAD_AVG_NEEDS_ROOT
3649 if (receiving_message &&
3650 (queue_only_load >= 0 ||
3651 (is_inetd && smtp_load_reserve >= 0)
3654 load_average = OS_GETLOADAVG();
3658 /* The queue_only configuration option can be overridden by -odx on the command
3659 line, except that if queue_only_override is false, queue_only cannot be unset
3660 from the command line. */
3662 if (queue_only_set && (queue_only_override || arg_queue_only))
3663 queue_only = arg_queue_only;
3665 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3668 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3669 if (arg_smtp_receive_timeout >= 0)
3670 smtp_receive_timeout = arg_smtp_receive_timeout;
3672 /* If Exim was started with root privilege, unless we have already removed the
3673 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3674 except when starting the daemon or doing some kind of delivery or address
3675 testing (-bt). These are the only cases when root need to be retained. We run
3676 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3677 retained only for starting the daemon. We always do the initgroups() in this
3678 situation (controlled by the TRUE below), in order to be as close as possible
3679 to the state Exim usually runs in. */
3681 if (!unprivileged && /* originally had root AND */
3682 !removed_privilege && /* still got root AND */
3683 !daemon_listen && /* not starting the daemon */
3684 queue_interval <= 0 && /* (either kind of daemon) */
3686 deliver_drop_privilege || /* requested unprivileged */
3688 queue_interval < 0 && /* not running the queue */
3689 (msg_action_arg < 0 || /* and */
3690 msg_action != MSG_DELIVER) && /* not delivering and */
3691 (!checking || !address_test_mode) /* not address checking */
3695 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3698 /* When we are retaining a privileged uid, we still change to the exim gid. */
3700 else setgid(exim_gid);
3702 /* Handle a request to scan a file for malware */
3703 if (malware_test_file)
3705 #ifdef WITH_CONTENT_SCAN
3707 set_process_info("scanning file for malware");
3708 result = malware_in_file(malware_test_file);
3711 printf("No malware found.\n");
3716 printf("Malware lookup returned non-okay/fail: %d\n", result);
3720 printf("Malware found: %s\n", malware_name);
3722 printf("Malware scan detected malware of unknown name.\n");
3724 printf("Malware scanning not enabled at compile time.\n");
3729 /* Handle a request to list the delivery queue */
3733 set_process_info("listing the queue");
3734 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3738 /* Handle a request to count the delivery queue */
3742 set_process_info("counting the queue");
3747 /* Handle actions on specific messages, except for the force delivery and
3748 message load actions, which are done below. Some actions take a whole list of
3749 message ids, which are known to continue up to the end of the arguments. Others
3750 take a single message id and then operate on the recipients list. */
3752 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3754 int yield = EXIT_SUCCESS;
3755 set_process_info("acting on specified messages");
3757 if (!one_msg_action)
3759 for (i = msg_action_arg; i < argc; i++)
3760 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3761 yield = EXIT_FAILURE;
3764 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3765 recipients_arg)) yield = EXIT_FAILURE;
3769 /* All the modes below here require the remaining configuration sections
3770 to be read, except that we can skip over the ACL setting when delivering
3771 specific messages, or doing a queue run. (For various testing cases we could
3772 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3775 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3777 /* The configuration data will have been read into POOL_PERM because we won't
3778 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3779 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3780 configuration were read into POOL_MAIN, because we don't do any resets till
3781 later on. However, it seems right, and it does ensure that both pools get used.
3784 store_pool = POOL_MAIN;
3786 /* Handle the -brt option. This is for checking out retry configurations.
3787 The next three arguments are a domain name or a complete address, and
3788 optionally two error numbers. All it does is to call the function that
3789 scans the retry configuration data. */
3791 if (test_retry_arg >= 0)
3793 retry_config *yield;
3794 int basic_errno = 0;
3798 if (test_retry_arg >= argc)
3800 printf("-brt needs a domain or address argument\n");
3801 exim_exit(EXIT_FAILURE);
3803 s1 = argv[test_retry_arg++];
3806 /* If the first argument contains no @ and no . it might be a local user
3807 or it might be a single-component name. Treat as a domain. */
3809 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3811 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3812 "being \ntreated as a one-component domain, not as a local part.\n\n",
3816 /* There may be an optional second domain arg. */
3818 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3819 s2 = argv[test_retry_arg++];
3821 /* The final arg is an error name */
3823 if (test_retry_arg < argc)
3825 uschar *ss = argv[test_retry_arg];
3827 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3830 printf("%s\n", CS error);
3831 return EXIT_FAILURE;
3834 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3835 code > 100 as an error is for matching codes to the decade. Turn them into
3836 a real error code, off the decade. */
3838 if (basic_errno == ERRNO_MAIL4XX ||
3839 basic_errno == ERRNO_RCPT4XX ||
3840 basic_errno == ERRNO_DATA4XX)
3842 int code = (more_errno >> 8) & 255;
3844 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3845 else if (code > 100)
3846 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3850 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3851 if (yield == NULL) printf("No retry information found\n"); else
3854 more_errno = yield->more_errno;
3855 printf("Retry rule: %s ", yield->pattern);
3857 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3859 printf("quota%s%s ",
3860 (more_errno > 0)? "_" : "",
3861 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3863 else if (yield->basic_errno == ECONNREFUSED)
3865 printf("refused%s%s ",
3866 (more_errno > 0)? "_" : "",
3867 (more_errno == 'M')? "MX" :
3868 (more_errno == 'A')? "A" : "");
3870 else if (yield->basic_errno == ETIMEDOUT)
3873 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3875 if (more_errno != 0) printf("_%s",
3876 (more_errno == 'M')? "MX" : "A");
3879 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3880 printf("auth_failed ");
3883 for (r = yield->rules; r != NULL; r = r->next)
3885 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3886 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3892 printf(",%d.", x/1000);
3906 exim_exit(EXIT_SUCCESS);
3909 /* Handle a request to list one or more configuration options */
3913 set_process_info("listing variables");
3914 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3915 else for (i = recipients_arg; i < argc; i++)
3918 (Ustrcmp(argv[i], "router") == 0 ||
3919 Ustrcmp(argv[i], "transport") == 0 ||
3920 Ustrcmp(argv[i], "authenticator") == 0 ||
3921 Ustrcmp(argv[i], "macro") == 0))
3923 readconf_print(argv[i+1], argv[i]);
3926 else readconf_print(argv[i], NULL);
3928 exim_exit(EXIT_SUCCESS);
3932 /* Handle a request to deliver one or more messages that are already on the
3933 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3934 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3936 Delivery of specific messages is typically used for a small number when
3937 prodding by hand (when the option forced_delivery will be set) or when
3938 re-execing to regain root privilege. Each message delivery must happen in a
3939 separate process, so we fork a process for each one, and run them sequentially
3940 so that debugging output doesn't get intertwined, and to avoid spawning too
3941 many processes if a long list is given. However, don't fork for the last one;
3942 this saves a process in the common case when Exim is called to deliver just one
3945 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3947 if (prod_requires_admin && !admin_user)
3949 fprintf(stderr, "exim: Permission denied\n");
3950 exim_exit(EXIT_FAILURE);
3952 set_process_info("delivering specified messages");
3953 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3954 for (i = msg_action_arg; i < argc; i++)
3959 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3960 else if ((pid = fork()) == 0)
3962 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3963 _exit(EXIT_SUCCESS);
3967 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3969 exim_exit(EXIT_FAILURE);
3973 exim_exit(EXIT_SUCCESS);
3977 /* If only a single queue run is requested, without SMTP listening, we can just
3978 turn into a queue runner, with an optional starting message id. */
3980 if (queue_interval == 0 && !daemon_listen)
3982 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3983 (start_queue_run_id == NULL)? US"" : US" starting at ",
3984 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3985 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3986 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3987 set_process_info("running the queue (single queue run)");
3988 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3989 exim_exit(EXIT_SUCCESS);
3993 /* Find the login name of the real user running this process. This is always
3994 needed when receiving a message, because it is written into the spool file. It
3995 may also be used to construct a from: or a sender: header, and in this case we
3996 need the user's full name as well, so save a copy of it, checked for RFC822
3997 syntax and munged if necessary, if it hasn't previously been set by the -F
3998 argument. We may try to get the passwd entry more than once, in case NIS or
3999 other delays are in evidence. Save the home directory for use in filter testing
4004 if ((pw = getpwuid(real_uid)) != NULL)
4006 originator_login = string_copy(US pw->pw_name);
4007 originator_home = string_copy(US pw->pw_dir);
4009 /* If user name has not been set by -F, set it from the passwd entry
4010 unless -f has been used to set the sender address by a trusted user. */
4012 if (originator_name == NULL)
4014 if (sender_address == NULL ||
4015 (!trusted_caller && filter_test == FTEST_NONE))
4017 uschar *name = US pw->pw_gecos;
4018 uschar *amp = Ustrchr(name, '&');
4021 /* Most Unix specify that a '&' character in the gecos field is
4022 replaced by a copy of the login name, and some even specify that
4023 the first character should be upper cased, so that's what we do. */
4028 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4029 amp - name, name, &loffset, originator_login, amp + 1);
4030 buffer[loffset] = toupper(buffer[loffset]);
4034 /* If a pattern for matching the gecos field was supplied, apply
4035 it and then expand the name string. */
4037 if (gecos_pattern != NULL && gecos_name != NULL)
4040 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4042 if (regex_match_and_setup(re, name, 0, -1))
4044 uschar *new_name = expand_string(gecos_name);
4046 if (new_name != NULL)
4048 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4049 "gecos field \"%s\"\n", new_name, name);
4052 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4053 "\"%s\": %s\n", gecos_name, expand_string_message);
4055 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4056 "gecos field \"%s\"\n", gecos_pattern, name);
4057 store_free((void *)re);
4059 originator_name = string_copy(name);
4062 /* A trusted caller has used -f but not -F */
4064 else originator_name = US"";
4067 /* Break the retry loop */
4072 if (++i > finduser_retries) break;
4076 /* If we cannot get a user login, log the incident and give up, unless the
4077 configuration specifies something to use. When running in the test harness,
4078 any setting of unknown_login overrides the actual name. */
4080 if (originator_login == NULL || running_in_test_harness)
4082 if (unknown_login != NULL)
4084 originator_login = expand_string(unknown_login);
4085 if (originator_name == NULL && unknown_username != NULL)
4086 originator_name = expand_string(unknown_username);
4087 if (originator_name == NULL) originator_name = US"";
4089 if (originator_login == NULL)
4090 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4094 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4097 originator_name = string_copy(parse_fix_phrase(originator_name,
4098 Ustrlen(originator_name), big_buffer, big_buffer_size));
4100 /* If a message is created by this call of Exim, the uid/gid of its originator
4101 are those of the caller. These values are overridden if an existing message is
4102 read in from the spool. */
4104 originator_uid = real_uid;
4105 originator_gid = real_gid;
4107 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4108 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4110 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4111 returns. We leave this till here so that the originator_ fields are available
4112 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4115 if (daemon_listen || queue_interval > 0)
4119 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4120 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4121 "mua_wrapper is set");
4126 /* If the sender ident has not been set (by a trusted caller) set it to
4127 the caller. This will get overwritten below for an inetd call. If a trusted
4128 caller has set it empty, unset it. */
4130 if (sender_ident == NULL) sender_ident = originator_login;
4131 else if (sender_ident[0] == 0) sender_ident = NULL;
4133 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4134 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4135 originator_* variables set. */
4137 if (test_rewrite_arg >= 0)
4139 really_exim = FALSE;
4140 if (test_rewrite_arg >= argc)
4142 printf("-brw needs an address argument\n");
4143 exim_exit(EXIT_FAILURE);
4145 rewrite_test(argv[test_rewrite_arg]);
4146 exim_exit(EXIT_SUCCESS);
4149 /* A locally-supplied message is considered to be coming from a local user
4150 unless a trusted caller supplies a sender address with -f, or is passing in the
4151 message via SMTP (inetd invocation or otherwise). */
4153 if ((sender_address == NULL && !smtp_input) ||
4154 (!trusted_caller && filter_test == FTEST_NONE))
4156 sender_local = TRUE;
4158 /* A trusted caller can supply authenticated_sender and authenticated_id
4159 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4160 defaults except when host checking. */
4162 if (authenticated_sender == NULL && !host_checking)
4163 authenticated_sender = string_sprintf("%s@%s", originator_login,
4164 qualify_domain_sender);
4165 if (authenticated_id == NULL && !host_checking)
4166 authenticated_id = originator_login;
4169 /* Trusted callers are always permitted to specify the sender address.
4170 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4171 is specified is the empty address. However, if a trusted caller does not
4172 specify a sender address for SMTP input, we leave sender_address unset. This
4173 causes the MAIL commands to be honoured. */
4175 if ((!smtp_input && sender_address == NULL) ||
4176 !receive_check_set_sender(sender_address))
4178 /* Either the caller is not permitted to set a general sender, or this is
4179 non-SMTP input and the trusted caller has not set a sender. If there is no
4180 sender, or if a sender other than <> is set, override with the originator's
4181 login (which will get qualified below), except when checking things. */
4183 if (sender_address == NULL /* No sender_address set */
4185 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4186 !checking && /* Not running tests, AND */
4187 filter_test == FTEST_NONE)) /* Not testing a filter */
4189 sender_address = originator_login;
4190 sender_address_forced = FALSE;
4191 sender_address_domain = 0;
4195 /* Remember whether an untrusted caller set the sender address */
4197 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4199 /* Ensure that the sender address is fully qualified unless it is the empty
4200 address, which indicates an error message, or doesn't exist (root caller, smtp
4201 interface, no -f argument). */
4203 if (sender_address != NULL && sender_address[0] != 0 &&
4204 sender_address_domain == 0)
4205 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4206 qualify_domain_sender);
4208 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4210 /* Handle a request to verify a list of addresses, or test them for delivery.
4211 This must follow the setting of the sender address, since routers can be
4212 predicated upon the sender. If no arguments are given, read addresses from
4213 stdin. Set debug_level to at least D_v to get full output for address testing.
4216 if (verify_address_mode || address_test_mode)
4219 int flags = vopt_qualify;
4221 if (verify_address_mode)
4223 if (!verify_as_sender) flags |= vopt_is_recipient;
4224 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4229 flags |= vopt_is_recipient;
4230 debug_selector |= D_v;
4231 debug_file = stderr;
4232 debug_fd = fileno(debug_file);
4233 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4236 if (recipients_arg < argc)
4238 while (recipients_arg < argc)
4240 uschar *s = argv[recipients_arg++];
4243 BOOL finished = FALSE;
4244 uschar *ss = parse_find_address_end(s, FALSE);
4245 if (*ss == ',') *ss = 0; else finished = TRUE;
4246 test_address(s, flags, &exit_value);
4249 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4256 uschar *s = get_stdinput(NULL, NULL);
4257 if (s == NULL) break;
4258 test_address(s, flags, &exit_value);
4262 exim_exit(exit_value);
4265 /* Handle expansion checking. Either expand items on the command line, or read
4266 from stdin if there aren't any. If -Mset was specified, load the message so
4267 that its variables can be used, but restrict this facility to admin users.
4268 Otherwise, if -bem was used, read a message from stdin. */
4272 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4274 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4277 fprintf(stderr, "exim: permission denied\n");
4280 message_id = argv[msg_action_arg];
4281 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4282 if (!spool_open_datafile(message_id))
4283 printf ("Failed to load message datafile %s\n", message_id);
4284 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4285 printf ("Failed to load message %s\n", message_id);
4288 /* Read a test message from a file. We fudge it up to be on stdin, saving
4289 stdin itself for later reading of expansion strings. */
4291 else if (expansion_test_message != NULL)
4293 int save_stdin = dup(0);
4294 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4297 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4299 return EXIT_FAILURE;
4302 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4303 message_ended = END_NOTENDED;
4304 read_message_body(receive_msg(extract_recipients));
4305 message_linecount += body_linecount;
4306 (void)dup2(save_stdin, 0);
4307 (void)close(save_stdin);
4308 clearerr(stdin); /* Required by Darwin */
4311 /* Allow $recipients for this testing */
4313 enable_dollar_recipients = TRUE;
4315 /* Expand command line items */
4317 if (recipients_arg < argc)
4319 while (recipients_arg < argc)
4321 uschar *s = argv[recipients_arg++];
4322 uschar *ss = expand_string(s);
4323 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4324 else printf("%s\n", CS ss);
4332 char *(*fn_readline)(char *) = NULL;
4333 char *(*fn_addhist)(char *) = NULL;
4336 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4342 uschar *source = get_stdinput(fn_readline, fn_addhist);
4343 if (source == NULL) break;
4344 ss = expand_string(source);
4346 printf ("Failed: %s\n", expand_string_message);
4347 else printf("%s\n", CS ss);
4351 if (dlhandle != NULL) dlclose(dlhandle);
4355 /* The data file will be open after -Mset */
4357 if (deliver_datafile >= 0)
4359 (void)close(deliver_datafile);
4360 deliver_datafile = -1;
4363 exim_exit(EXIT_SUCCESS);
4367 /* The active host name is normally the primary host name, but it can be varied
4368 for hosts that want to play several parts at once. We need to ensure that it is
4369 set for host checking, and for receiving messages. */
4371 smtp_active_hostname = primary_hostname;
4372 if (raw_active_hostname != NULL)
4374 uschar *nah = expand_string(raw_active_hostname);
4377 if (!expand_string_forcedfail)
4378 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4379 "(smtp_active_hostname): %s", raw_active_hostname,
4380 expand_string_message);
4382 else if (nah[0] != 0) smtp_active_hostname = nah;
4385 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4386 given IP address so that the blocking and relay configuration can be tested.
4387 Unless a sender_ident was set by -oMt, we discard it (the default is the
4388 caller's login name). An RFC 1413 call is made only if we are running in the
4389 test harness and an incoming interface and both ports are specified, because
4390 there is no TCP/IP call to find the ident for. */
4397 if (!sender_ident_set)
4399 sender_ident = NULL;
4400 if (running_in_test_harness && sender_host_port != 0 &&
4401 interface_address != NULL && interface_port != 0)
4402 verify_get_ident(1413);
4405 /* In case the given address is a non-canonical IPv6 address, canonicize
4406 it. The code works for both IPv4 and IPv6, as it happens. */
4408 size = host_aton(sender_host_address, x);
4409 sender_host_address = store_get(48); /* large enough for full IPv6 */
4410 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4412 /* Now set up for testing */
4414 host_build_sender_fullhost();
4418 sender_local = FALSE;
4419 sender_host_notsocket = TRUE;
4420 debug_file = stderr;
4421 debug_fd = fileno(debug_file);
4422 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4423 "**** but without any ident (RFC 1413) callback.\n"
4424 "**** This is not for real!\n\n",
4425 sender_host_address);
4427 if (verify_check_host(&hosts_connection_nolog) == OK)
4428 log_write_selector &= ~L_smtp_connection;
4429 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4431 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4432 because a log line has already been written for all its failure exists
4433 (usually "connection refused: <reason>") and writing another one is
4434 unnecessary clutter. */
4436 if (smtp_start_session())
4438 reset_point = store_get(0);
4441 store_reset(reset_point);
4442 if (smtp_setup_msg() <= 0) break;
4443 if (!receive_msg(FALSE)) break;
4447 exim_exit(EXIT_SUCCESS);
4451 /* Arrange for message reception if recipients or SMTP were specified;
4452 otherwise complain unless a version print (-bV) happened or this is a filter
4453 verification test. In the former case, show the configuration file name. */
4455 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4457 if (version_printed)
4459 printf("Configuration file is %s\n", config_main_filename);
4460 return EXIT_SUCCESS;
4463 if (filter_test == FTEST_NONE)
4464 exim_usage(called_as);
4468 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4469 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4470 that we are not called from inetd, because that is rejected above. The
4471 following configuration settings are forced here:
4473 (1) Synchronous delivery (-odi)
4474 (2) Errors to stderr (-oep == -oeq)
4475 (3) No parallel remote delivery
4476 (4) Unprivileged delivery
4478 We don't force overall queueing options because there are several of them;
4479 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4480 to override any SMTP queueing. */
4484 synchronous_delivery = TRUE;
4485 arg_error_handling = ERRORS_STDERR;
4486 remote_max_parallel = 1;
4487 deliver_drop_privilege = TRUE;
4489 queue_smtp_domains = NULL;
4493 /* Prepare to accept one or more new messages on the standard input. When a
4494 message has been read, its id is returned in message_id[]. If doing immediate
4495 delivery, we fork a delivery process for each received message, except for the
4496 last one, where we can save a process switch.
4498 It is only in non-smtp mode that error_handling is allowed to be changed from
4499 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4500 sendmail error modes other than -oem ever actually used? Later: yes.) */
4502 if (!smtp_input) error_handling = arg_error_handling;
4504 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4505 logging being sent down the socket and make an identd call to get the
4510 (void)fclose(stderr);
4511 exim_nullstd(); /* Re-open to /dev/null */
4512 verify_get_ident(IDENT_PORT);
4513 host_build_sender_fullhost();
4514 set_process_info("handling incoming connection from %s via inetd",
4518 /* If the sender host address has been set, build sender_fullhost if it hasn't
4519 already been done (which it will have been for inetd). This caters for the
4520 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4521 so that the test for IP options is skipped for -bs input. */
4523 if (sender_host_address != NULL && sender_fullhost == NULL)
4525 host_build_sender_fullhost();
4526 set_process_info("handling incoming connection from %s via -oMa",
4528 sender_host_notsocket = TRUE;
4531 /* Otherwise, set the sender host as unknown except for inetd calls. This
4532 prevents host checking in the case of -bs not from inetd and also for -bS. */
4534 else if (!is_inetd) sender_host_unknown = TRUE;
4536 /* If stdout does not exist, then dup stdin to stdout. This can happen
4537 if exim is started from inetd. In this case fd 0 will be set to the socket,
4538 but fd 1 will not be set. This also happens for passed SMTP channels. */
4540 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4542 /* Set up the incoming protocol name and the state of the program. Root is
4543 allowed to force received protocol via the -oMr option above. If we have come
4544 via inetd, the process info has already been set up. We don't set
4545 received_protocol here for smtp input, as it varies according to
4546 batch/HELO/EHLO/AUTH/TLS. */
4550 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4551 smtp_batched_input? "batched " : "",
4552 (sender_address!= NULL)? sender_address : originator_login);
4556 if (received_protocol == NULL)
4557 received_protocol = string_sprintf("local%s", called_as);
4558 set_process_info("accepting a local non-SMTP message from <%s>",
4562 /* Initialize the session_local_queue-only flag (this will be ignored if
4563 mua_wrapper is set) */
4566 session_local_queue_only = queue_only;
4568 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4569 the spool if so configured. On failure, we must not attempt to send an error
4570 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4571 error code is given.) */
4573 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4575 fprintf(stderr, "exim: insufficient disk space\n");
4576 return EXIT_FAILURE;
4579 /* If this is smtp input of any kind, real or batched, handle the start of the
4582 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4583 because a log line has already been written for all its failure exists
4584 (usually "connection refused: <reason>") and writing another one is
4585 unnecessary clutter. */
4591 if (verify_check_host(&hosts_connection_nolog) == OK)
4592 log_write_selector &= ~L_smtp_connection;
4593 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4594 if (!smtp_start_session())
4597 exim_exit(EXIT_SUCCESS);
4601 /* Otherwise, set up the input size limit here. */
4605 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4606 if (expand_string_message != NULL)
4608 if (thismessage_size_limit == -1)
4609 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4610 "message_size_limit: %s", expand_string_message);
4612 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4613 "message_size_limit: %s", expand_string_message);
4617 /* Loop for several messages when reading SMTP input. If we fork any child
4618 processes, we don't want to wait for them unless synchronous delivery is
4619 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4620 same as SIG_DFL, despite the fact that documentation often lists the default as
4621 "ignore". This is a confusing area. This is what I know:
4623 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4624 processes that complete simply to go away without ever becoming defunct. You
4625 can't then wait for them - but we don't want to wait for them in the
4626 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4627 happen for all OS (e.g. *BSD is different).
4629 But that's not the end of the story. Some (many? all?) systems have the
4630 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4631 has by default, so it seems that the difference is merely one of default
4632 (compare restarting vs non-restarting signals).
4634 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4635 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4636 of the loop below. Paranoia rules.
4638 February 2003: That's *still* not the end of the story. There are now versions
4639 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4640 process then calls waitpid(), a grumble is written to the system log, because
4641 this is logically inconsistent. In other words, it doesn't like the paranoia.
4642 As a consequenc of this, the waitpid() below is now excluded if we are sure
4643 that SIG_IGN works. */
4645 if (!synchronous_delivery)
4648 struct sigaction act;
4649 act.sa_handler = SIG_IGN;
4650 sigemptyset(&(act.sa_mask));
4651 act.sa_flags = SA_NOCLDWAIT;
4652 sigaction(SIGCHLD, &act, NULL);
4654 signal(SIGCHLD, SIG_IGN);
4658 /* Save the current store pool point, for resetting at the start of
4659 each message, and save the real sender address, if any. */
4661 reset_point = store_get(0);
4662 real_sender_address = sender_address;
4664 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4665 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4670 store_reset(reset_point);
4673 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4674 input and build the recipients list, before calling receive_msg() to read the
4675 message proper. Whatever sender address is given in the SMTP transaction is
4676 often ignored for local senders - we use the actual sender, which is normally
4677 either the underlying user running this process or a -f argument provided by
4678 a trusted caller. It is saved in real_sender_address. The test for whether to
4679 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4684 if ((rc = smtp_setup_msg()) > 0)
4686 if (real_sender_address != NULL &&
4687 !receive_check_set_sender(sender_address))
4689 sender_address = raw_sender = real_sender_address;
4690 sender_address_unrewritten = NULL;
4693 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4694 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4695 the very end. The result of the ACL is ignored (as for other non-SMTP
4696 messages). It is run for its potential side effects. */
4698 if (smtp_batched_input && acl_not_smtp_start != NULL)
4700 uschar *user_msg, *log_msg;
4701 enable_dollar_recipients = TRUE;
4702 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4703 &user_msg, &log_msg);
4704 enable_dollar_recipients = FALSE;
4707 /* Now get the data for the message */
4709 more = receive_msg(extract_recipients);
4710 if (message_id[0] == 0)
4713 smtp_log_no_mail(); /* Log no mail if configured */
4714 exim_exit(EXIT_FAILURE);
4719 smtp_log_no_mail(); /* Log no mail if configured */
4720 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4724 /* In the non-SMTP case, we have all the information from the command
4725 line, but must process it in case it is in the more general RFC822
4726 format, and in any case, to detect syntax errors. Also, it appears that
4727 the use of comma-separated lists as single arguments is common, so we
4728 had better support them. */
4734 int count = argc - recipients_arg;
4735 uschar **list = argv + recipients_arg;
4737 /* These options cannot be changed dynamically for non-SMTP messages */
4739 active_local_sender_retain = local_sender_retain;
4740 active_local_from_check = local_from_check;
4742 /* Save before any rewriting */
4744 raw_sender = string_copy(sender_address);
4746 /* Loop for each argument */
4748 for (i = 0; i < count; i++)
4750 int start, end, domain;
4752 uschar *s = list[i];
4754 /* Loop for each comma-separated address */
4758 BOOL finished = FALSE;
4760 uschar *ss = parse_find_address_end(s, FALSE);
4762 if (*ss == ',') *ss = 0; else finished = TRUE;
4764 /* Check max recipients - if -t was used, these aren't recipients */
4766 if (recipients_max > 0 && ++rcount > recipients_max &&
4767 !extract_recipients)
4769 if (error_handling == ERRORS_STDERR)
4771 fprintf(stderr, "exim: too many recipients\n");
4772 exim_exit(EXIT_FAILURE);
4777 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4778 errors_sender_rc : EXIT_FAILURE;
4783 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4785 if (domain == 0 && !allow_unqualified_recipient)
4788 errmess = US"unqualified recipient address not allowed";
4791 if (recipient == NULL)
4793 if (error_handling == ERRORS_STDERR)
4795 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4796 string_printing(list[i]), errmess);
4797 exim_exit(EXIT_FAILURE);
4803 eblock.text1 = string_printing(list[i]);
4804 eblock.text2 = errmess;
4806 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4807 errors_sender_rc : EXIT_FAILURE;
4811 receive_add_recipient(recipient, -1);
4814 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4818 /* Show the recipients when debugging */
4823 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4824 if (recipients_list != NULL)
4826 debug_printf("Recipients:\n");
4827 for (i = 0; i < recipients_count; i++)
4828 debug_printf(" %s\n", recipients_list[i].address);
4832 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4833 ignored; rejecting here would just add complication, and it can just as
4834 well be done later. Allow $recipients to be visible in the ACL. */
4836 if (acl_not_smtp_start != NULL)
4838 uschar *user_msg, *log_msg;
4839 enable_dollar_recipients = TRUE;
4840 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4841 &user_msg, &log_msg);
4842 enable_dollar_recipients = FALSE;
4845 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4846 will just read the headers for the message, and not write anything onto the
4849 message_ended = END_NOTENDED;
4850 more = receive_msg(extract_recipients);
4852 /* more is always FALSE here (not SMTP message) when reading a message
4853 for real; when reading the headers of a message for filter testing,
4854 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4856 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4857 } /* Non-SMTP message reception */
4859 /* If this is a filter testing run, there are headers in store, but
4860 no message on the spool. Run the filtering code in testing mode, setting
4861 the domain to the qualify domain and the local part to the current user,
4862 unless they have been set by options. The prefix and suffix are left unset
4863 unless specified. The the return path is set to to the sender unless it has
4864 already been set from a return-path header in the message. */
4866 if (filter_test != FTEST_NONE)
4868 deliver_domain = (ftest_domain != NULL)?
4869 ftest_domain : qualify_domain_recipient;
4870 deliver_domain_orig = deliver_domain;
4871 deliver_localpart = (ftest_localpart != NULL)?
4872 ftest_localpart : originator_login;
4873 deliver_localpart_orig = deliver_localpart;
4874 deliver_localpart_prefix = ftest_prefix;
4875 deliver_localpart_suffix = ftest_suffix;
4876 deliver_home = originator_home;
4878 if (return_path == NULL)
4880 printf("Return-path copied from sender\n");
4881 return_path = string_copy(sender_address);
4885 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4887 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4889 receive_add_recipient(
4890 string_sprintf("%s%s%s@%s",
4891 (ftest_prefix == NULL)? US"" : ftest_prefix,
4893 (ftest_suffix == NULL)? US"" : ftest_suffix,
4894 deliver_domain), -1);
4896 printf("Recipient = %s\n", recipients_list[0].address);
4897 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4898 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4900 (void)chdir("/"); /* Get away from wherever the user is running this from */
4902 /* Now we run either a system filter test, or a user filter test, or both.
4903 In the latter case, headers added by the system filter will persist and be
4904 available to the user filter. We need to copy the filter variables
4907 if ((filter_test & FTEST_SYSTEM) != 0)
4909 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4910 exim_exit(EXIT_FAILURE);
4913 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4915 if ((filter_test & FTEST_USER) != 0)
4917 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4918 exim_exit(EXIT_FAILURE);
4921 exim_exit(EXIT_SUCCESS);
4924 /* Else act on the result of message reception. We should not get here unless
4925 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4926 will be TRUE. If it is not, check on the number of messages received in this
4929 if (!session_local_queue_only &&
4930 smtp_accept_queue_per_connection > 0 &&
4931 receive_messagecount > smtp_accept_queue_per_connection)
4933 session_local_queue_only = TRUE;
4934 queue_only_reason = 2;
4937 /* Initialize local_queue_only from session_local_queue_only. If it is false,
4938 and queue_only_load is set, check that the load average is below it. If it is
4939 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4940 default), we put the whole session into queue_only mode. It then remains this
4941 way for any subsequent messages on the same SMTP connection. This is a
4942 deliberate choice; even though the load average may fall, it doesn't seem
4943 right to deliver later messages on the same call when not delivering earlier
4944 ones. However, there are odd cases where this is not wanted, so this can be
4945 changed by setting queue_only_load_latch false. */
4947 local_queue_only = session_local_queue_only;
4948 if (!local_queue_only && queue_only_load >= 0)
4950 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4951 if (local_queue_only)
4953 queue_only_reason = 3;
4954 if (queue_only_load_latch) session_local_queue_only = TRUE;
4958 /* If running as an MUA wrapper, all queueing options and freezing options
4962 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4964 /* Log the queueing here, when it will get a message id attached, but
4965 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4968 if (local_queue_only) switch(queue_only_reason)
4971 log_write(L_delay_delivery,
4972 LOG_MAIN, "no immediate delivery: more than %d messages "
4973 "received in one connection", smtp_accept_queue_per_connection);
4977 log_write(L_delay_delivery,
4978 LOG_MAIN, "no immediate delivery: load average %.2f",
4979 (double)load_average/1000.0);
4983 /* Else do the delivery unless the ACL or local_scan() called for queue only
4984 or froze the message. Always deliver in a separate process. A fork failure is
4985 not a disaster, as the delivery will eventually happen on a subsequent queue
4986 run. The search cache must be tidied before the fork, as the parent will
4987 do it before exiting. The child will trigger a lookup failure and
4988 thereby defer the delivery if it tries to use (for example) a cached ldap
4989 connection that the parent has called unbind on. */
4991 else if (!queue_only_policy && !deliver_freeze)
4996 if ((pid = fork()) == 0)
4999 close_unwanted(); /* Close unwanted file descriptors and TLS */
5000 exim_nullstd(); /* Ensure std{in,out,err} exist */
5002 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5003 mode, deliver_drop_privilege is forced TRUE). */
5005 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5007 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5009 /* Control does not return here. */
5012 /* No need to re-exec */
5014 rc = deliver_message(message_id, FALSE, FALSE);
5016 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5017 EXIT_SUCCESS : EXIT_FAILURE);
5022 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5023 "process: %s", strerror(errno));
5026 /* In the parent, wait if synchronous delivery is required. This will
5027 always be the case in MUA wrapper mode. */
5029 else if (synchronous_delivery)
5032 while (wait(&status) != pid);
5033 if ((status & 0x00ff) != 0)
5034 log_write(0, LOG_MAIN|LOG_PANIC,
5035 "process %d crashed with signal %d while delivering %s",
5036 (int)pid, status & 0x00ff, message_id);
5037 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5041 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5042 automatically reaps children (see comments above the loop), clear away any
5043 finished subprocesses here, in case there are lots of messages coming in
5044 from the same source. */
5046 #ifndef SIG_IGN_WORKS
5047 while (waitpid(-1, NULL, WNOHANG) > 0);
5051 exim_exit(EXIT_SUCCESS); /* Never returns */
5052 return 0; /* To stop compiler warning */