1 /* $Cambridge: exim/src/src/exim.c,v 1.35 2006/02/22 14:46:44 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
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)
402 f = Ufopen(filename, options);
404 if (f != NULL) (void)fchmod(fileno(f), mode);
411 /*************************************************
412 * Ensure stdin, stdout, and stderr exist *
413 *************************************************/
415 /* Some operating systems grumble if an exec() happens without a standard
416 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
417 file will be opened and will use these fd values, and then some other bit of
418 code will assume, for example, that it can write error messages to stderr.
419 This function ensures that fds 0, 1, and 2 are open if they do not already
420 exist, by connecting them to /dev/null.
422 This function is also used to ensure that std{in,out,err} exist at all times,
423 so that if any library that Exim calls tries to use them, it doesn't crash.
435 for (i = 0; i <= 2; i++)
437 if (fstat(i, &statbuf) < 0 && errno == EBADF)
439 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
440 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
441 string_open_failed(errno, "/dev/null"));
442 if (devnull != i) (void)dup2(devnull, i);
445 if (devnull > 2) (void)close(devnull);
451 /*************************************************
452 * Close unwanted file descriptors for delivery *
453 *************************************************/
455 /* This function is called from a new process that has been forked to deliver
456 an incoming message, either directly, or using exec.
458 We want any smtp input streams to be closed in this new process. However, it
459 has been observed that using fclose() here causes trouble. When reading in -bS
460 input, duplicate copies of messages have been seen. The files will be sharing a
461 file pointer with the parent process, and it seems that fclose() (at least on
462 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
463 least sometimes. Hence we go for closing the underlying file descriptors.
465 If TLS is active, we want to shut down the TLS library, but without molesting
466 the parent's SSL connection.
468 For delivery of a non-SMTP message, we want to close stdin and stdout (and
469 stderr unless debugging) because the calling process might have set them up as
470 pipes and be waiting for them to close before it waits for the submission
471 process to terminate. If they aren't closed, they hold up the calling process
472 until the initial delivery process finishes, which is not what we want.
474 Exception: We do want it for synchronous delivery!
476 And notwithstanding all the above, if D_resolver is set, implying resolver
477 debugging, leave stdout open, because that's where the resolver writes its
480 When we close stderr (which implies we've also closed stdout), we also get rid
481 of any controlling terminal.
493 tls_close(FALSE); /* Shut down the TLS library */
495 (void)close(fileno(smtp_in));
496 (void)close(fileno(smtp_out));
501 (void)close(0); /* stdin */
502 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
503 if (debug_selector == 0) /* stderr */
505 if (!synchronous_delivery)
518 /*************************************************
520 *************************************************/
522 /* This function sets a new uid and gid permanently, optionally calling
523 initgroups() to set auxiliary groups. There are some special cases when running
524 Exim in unprivileged modes. In these situations the effective uid will not be
525 root; if we already have the right effective uid/gid, and don't need to
526 initialize any groups, leave things as they are.
531 igflag TRUE if initgroups() wanted
532 msg text to use in debugging output and failure log
534 Returns: nothing; bombs out on failure
538 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
540 uid_t euid = geteuid();
541 gid_t egid = getegid();
543 if (euid == root_uid || euid != uid || egid != gid || igflag)
545 /* At least one OS returns +1 for initgroups failure, so just check for
550 struct passwd *pw = getpwuid(uid);
553 if (initgroups(pw->pw_name, gid) != 0)
554 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
555 (long int)uid, strerror(errno));
557 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
558 "no passwd entry for uid=%ld", (long int)uid);
561 if (setgid(gid) < 0 || setuid(uid) < 0)
563 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
564 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
568 /* Debugging output included uid/gid and all groups */
573 gid_t group_list[NGROUPS_MAX];
574 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
575 (long int)geteuid(), (long int)getegid(), (long int)getpid());
576 group_count = getgroups(NGROUPS_MAX, group_list);
577 debug_printf(" auxiliary group list:");
581 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
583 else debug_printf(" <none>");
591 /*************************************************
593 *************************************************/
595 /* Exim exits via this function so that it always clears up any open
601 Returns: does not return
609 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
610 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
617 /*************************************************
618 * Extract port from host address *
619 *************************************************/
621 /* Called to extract the port from the values given to -oMa and -oMi.
622 It also checks the syntax of the address, and terminates it before the
623 port data when a port is extracted.
626 address the address, with possible port on the end
628 Returns: the port, or zero if there isn't one
629 bombs out on a syntax error
633 check_port(uschar *address)
635 int port = host_address_extract_port(address);
636 if (string_is_ip_address(address, NULL) == 0)
638 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
646 /*************************************************
647 * Test/verify an address *
648 *************************************************/
650 /* This function is called by the -bv and -bt code. It extracts a working
651 address from a full RFC 822 address. This isn't really necessary per se, but it
652 has the effect of collapsing source routes.
656 flags flag bits for verify_address()
657 exit_value to be set for failures
663 test_address(uschar *s, int flags, int *exit_value)
665 int start, end, domain;
666 uschar *parse_error = NULL;
667 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
671 fprintf(stdout, "syntax error: %s\n", parse_error);
676 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
677 -1, -1, NULL, NULL, NULL);
678 if (rc == FAIL) *exit_value = 2;
679 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
685 /*************************************************
686 * Decode bit settings for log/debug *
687 *************************************************/
689 /* This function decodes a string containing bit settings in the form of +name
690 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
691 also recognizes a numeric setting of the form =<number>, but this is not
692 intended for user use. It's an easy way for Exim to pass the debug settings
693 when it is re-exec'ed.
695 The log options are held in two unsigned ints (because there became too many
696 for one). The top bit in the table means "put in 2nd selector". This does not
697 yet apply to debug options, so the "=" facility sets only the first selector.
699 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
700 It sets all the bits in both selectors. However, there is a facility for then
701 unsetting certain bits, because we want to turn off "memory" in the debug case.
703 A bad value for a debug setting is treated as an unknown option - error message
704 to stderr and die. For log settings, which come from the configuration file,
705 we write to the log on the way out...
708 selector1 address of the first bit string
709 selector2 address of the second bit string, or NULL
710 notall1 bits to exclude from "all" for selector1
711 notall2 bits to exclude from "all" for selector2
712 string the configured string
713 options the table of option names
715 which "log" or "debug"
717 Returns: nothing on success - bomb out on failure
721 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
722 int notall2, uschar *string, bit_table *options, int count, uschar *which)
725 if (string == NULL) return;
729 char *end; /* Not uschar */
730 *selector1 = strtoul(CS string+1, &end, 0);
731 if (*end == 0) return;
732 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
737 /* Handle symbolic setting */
744 bit_table *start, *end;
746 while (isspace(*string)) string++;
747 if (*string == 0) return;
749 if (*string != '+' && *string != '-')
751 errmsg = string_sprintf("malformed %s_selector setting: "
752 "+ or - expected but found \"%s\"", which, string);
756 adding = *string++ == '+';
758 while (isalnum(*string) || *string == '_') string++;
762 end = options + count;
766 bit_table *middle = start + (end - start)/2;
767 int c = Ustrncmp(s, middle->name, len);
770 if (middle->name[len] != 0) c = -1; else
772 unsigned int bit = middle->bit;
773 unsigned int *selector;
775 /* The value with all bits set means "force all bits in both selectors"
776 in the case where two are being handled. However, the top bit in the
777 second selector is never set. When setting, some bits can be excluded.
780 if (bit == 0xffffffff)
784 *selector1 = 0xffffffff ^ notall1;
785 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
790 if (selector2 != NULL) *selector2 = 0;
794 /* Otherwise, the 0x80000000 bit means "this value, without the top
795 bit, belongs in the second selector". */
799 if ((bit & 0x80000000) != 0)
801 selector = selector2;
804 else selector = selector1;
805 if (adding) *selector |= bit; else *selector &= ~bit;
807 break; /* Out of loop to match selector name */
810 if (c < 0) end = middle; else start = middle + 1;
811 } /* Loop to match selector name */
815 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
816 adding? '+' : '-', len, s);
819 } /* Loop for selector names */
821 /* Handle disasters */
824 if (Ustrcmp(which, "debug") == 0)
826 fprintf(stderr, "exim: %s\n", errmsg);
829 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
834 /*************************************************
835 * Show supported features *
836 *************************************************/
838 /* This function is called for -bV and for -d to output the optional features
839 of the current Exim binary.
841 Arguments: a FILE for printing
846 show_whats_supported(FILE *f)
848 #ifdef DB_VERSION_STRING
849 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
850 #elif defined(BTREEVERSION) && defined(HASHVERSION)
852 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
854 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
856 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
857 fprintf(f, "Probably ndbm\n");
858 #elif defined(USE_TDB)
859 fprintf(f, "Using tdb\n");
862 fprintf(f, "Probably GDBM (native mode)\n");
864 fprintf(f, "Probably GDBM (compatibility mode)\n");
868 fprintf(f, "Support for:");
869 #ifdef SUPPORT_CRYPTEQ
870 fprintf(f, " crypteq");
873 fprintf(f, " iconv()");
878 #ifdef HAVE_LOGIN_CAP
879 fprintf(f, " use_classresources");
888 fprintf(f, " Expand_dlfunc");
890 #ifdef USE_TCP_WRAPPERS
891 fprintf(f, " TCPwrappers");
895 fprintf(f, " GnuTLS");
897 fprintf(f, " OpenSSL");
900 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
901 fprintf(f, " translate_ip_address");
903 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
904 fprintf(f, " move_frozen_messages");
906 #ifdef WITH_CONTENT_SCAN
907 fprintf(f, " Content_Scanning");
909 #ifdef WITH_OLD_DEMIME
910 fprintf(f, " Old_Demime");
912 #ifdef EXPERIMENTAL_SPF
913 fprintf(f, " Experimental_SPF");
915 #ifdef EXPERIMENTAL_SRS
916 fprintf(f, " Experimental_SRS");
918 #ifdef EXPERIMENTAL_BRIGHTMAIL
919 fprintf(f, " Experimental_Brightmail");
921 #ifdef EXPERIMENTAL_DOMAINKEYS
922 fprintf(f, " Experimental_DomainKeys");
926 fprintf(f, "Lookups:");
927 #ifdef LOOKUP_LSEARCH
928 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
934 fprintf(f, " dbm dbmnz");
937 fprintf(f, " dnsdb");
939 #ifdef LOOKUP_DSEARCH
940 fprintf(f, " dsearch");
943 fprintf(f, " ibase");
946 fprintf(f, " ldap ldapdn ldapm");
949 fprintf(f, " mysql");
952 fprintf(f, " nis nis0");
954 #ifdef LOOKUP_NISPLUS
955 fprintf(f, " nisplus");
958 fprintf(f, " oracle");
961 fprintf(f, " passwd");
964 fprintf(f, " pgsql");
967 fprintf(f, " sqlite");
970 fprintf(f, " testdb");
973 fprintf(f, " whoson");
977 fprintf(f, "Authenticators:");
979 fprintf(f, " cram_md5");
981 #ifdef AUTH_CYRUS_SASL
982 fprintf(f, " cyrus_sasl");
984 #ifdef AUTH_PLAINTEXT
985 fprintf(f, " plaintext");
992 fprintf(f, "Routers:");
994 fprintf(f, " accept");
996 #ifdef ROUTER_DNSLOOKUP
997 fprintf(f, " dnslookup");
999 #ifdef ROUTER_IPLITERAL
1000 fprintf(f, " ipliteral");
1002 #ifdef ROUTER_IPLOOKUP
1003 fprintf(f, " iplookup");
1005 #ifdef ROUTER_MANUALROUTE
1006 fprintf(f, " manualroute");
1008 #ifdef ROUTER_QUERYPROGRAM
1009 fprintf(f, " queryprogram");
1011 #ifdef ROUTER_REDIRECT
1012 fprintf(f, " redirect");
1016 fprintf(f, "Transports:");
1017 #ifdef TRANSPORT_APPENDFILE
1018 fprintf(f, " appendfile");
1019 #ifdef SUPPORT_MAILDIR
1020 fprintf(f, "/maildir");
1022 #ifdef SUPPORT_MAILSTORE
1023 fprintf(f, "/mailstore");
1029 #ifdef TRANSPORT_AUTOREPLY
1030 fprintf(f, " autoreply");
1032 #ifdef TRANSPORT_LMTP
1033 fprintf(f, " lmtp");
1035 #ifdef TRANSPORT_PIPE
1036 fprintf(f, " pipe");
1038 #ifdef TRANSPORT_SMTP
1039 fprintf(f, " smtp");
1043 if (fixed_never_users[0] > 0)
1046 fprintf(f, "Fixed never_users: ");
1047 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1048 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1049 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1052 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1058 /*************************************************
1059 * Quote a local part *
1060 *************************************************/
1062 /* This function is used when a sender address or a From: or Sender: header
1063 line is being created from the caller's login, or from an authenticated_id. It
1064 applies appropriate quoting rules for a local part.
1066 Argument: the local part
1067 Returns: the local part, quoted if necessary
1071 local_part_quote(uschar *lpart)
1073 BOOL needs_quote = FALSE;
1078 for (t = lpart; !needs_quote && *t != 0; t++)
1080 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1081 (*t != '.' || t == lpart || t[1] == 0);
1084 if (!needs_quote) return lpart;
1087 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1091 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1094 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1097 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1098 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1099 yield = string_cat(yield, &size, &ptr, nq, 1);
1103 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1111 /*************************************************
1112 * Load readline() functions *
1113 *************************************************/
1115 /* This function is called from testing executions that read data from stdin,
1116 but only when running as the calling user. Currently, only -be does this. The
1117 function loads the readline() function library and passes back the functions.
1118 On some systems, it needs the curses library, so load that too, but try without
1119 it if loading fails. All this functionality has to be requested at build time.
1122 fn_readline_ptr pointer to where to put the readline pointer
1123 fn_addhist_ptr pointer to where to put the addhistory function
1125 Returns: the dlopen handle or NULL on failure
1129 set_readline(char * (**fn_readline_ptr)(char *),
1130 char * (**fn_addhist_ptr)(char *))
1133 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1135 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1136 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1138 if (dlhandle != NULL)
1140 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1141 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1145 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1154 /*************************************************
1155 * Get a line from stdin for testing things *
1156 *************************************************/
1158 /* This function is called when running tests that can take a number of lines
1159 of input (for example, -be and -bt). It handles continuations and trailing
1160 spaces. And prompting and a blank line output on eof. If readline() is in use,
1161 the arguments are non-NULL and provide the relevant functions.
1164 fn_readline readline function or NULL
1165 fn_addhist addhist function or NULL
1167 Returns: pointer to dynamic memory, or NULL at end of file
1171 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1176 uschar *yield = NULL;
1178 if (fn_readline == NULL) printf("> ");
1182 uschar buffer[1024];
1186 char *readline_line = NULL;
1187 if (fn_readline != NULL)
1189 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1190 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1191 p = US readline_line;
1196 /* readline() not in use */
1199 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1203 /* Handle the line */
1205 ss = p + (int)Ustrlen(p);
1206 while (ss > p && isspace(ss[-1])) ss--;
1210 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1213 yield = string_cat(yield, &size, &ptr, p, ss - p);
1216 if (fn_readline != NULL) free(readline_line);
1219 if (ss == p || yield[ptr-1] != '\\')
1227 if (yield == NULL) printf("\n");
1233 /*************************************************
1234 * Entry point and high-level code *
1235 *************************************************/
1237 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1238 the appropriate action. All the necessary functions are present in the one
1239 binary. I originally thought one should split it up, but it turns out that so
1240 much of the apparatus is needed in each chunk that one might as well just have
1241 it all available all the time, which then makes the coding easier as well.
1244 argc count of entries in argv
1245 argv argument strings, with argv[0] being the program name
1247 Returns: EXIT_SUCCESS if terminated successfully
1248 EXIT_FAILURE otherwise, except when a message has been sent
1249 to the sender, and -oee was given
1253 main(int argc, char **cargv)
1255 uschar **argv = USS cargv;
1256 int arg_receive_timeout = -1;
1257 int arg_smtp_receive_timeout = -1;
1258 int arg_error_handling = error_handling;
1259 int filter_sfd = -1;
1260 int filter_ufd = -1;
1263 int list_queue_option = 0;
1265 int msg_action_arg = -1;
1266 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1267 int queue_only_reason = 0;
1269 int perl_start_option = 0;
1271 int recipients_arg = argc;
1272 int sender_address_domain = 0;
1273 int test_retry_arg = -1;
1274 int test_rewrite_arg = -1;
1275 BOOL arg_queue_only = FALSE;
1276 BOOL bi_option = FALSE;
1277 BOOL checking = FALSE;
1278 BOOL count_queue = FALSE;
1279 BOOL expansion_test = FALSE;
1280 BOOL extract_recipients = FALSE;
1281 BOOL forced_delivery = FALSE;
1282 BOOL f_end_dot = FALSE;
1283 BOOL deliver_give_up = FALSE;
1284 BOOL list_queue = FALSE;
1285 BOOL list_options = FALSE;
1286 BOOL local_queue_only;
1288 BOOL one_msg_action = FALSE;
1289 BOOL queue_only_set = FALSE;
1290 BOOL receiving_message = TRUE;
1292 BOOL removed_privilege = FALSE;
1293 BOOL verify_address_mode = FALSE;
1294 BOOL verify_as_sender = FALSE;
1295 BOOL version_printed = FALSE;
1296 uschar *alias_arg = NULL;
1297 uschar *called_as = US"";
1298 uschar *start_queue_run_id = NULL;
1299 uschar *stop_queue_run_id = NULL;
1300 uschar *ftest_domain = NULL;
1301 uschar *ftest_localpart = NULL;
1302 uschar *ftest_prefix = NULL;
1303 uschar *ftest_suffix = NULL;
1304 uschar *real_sender_address;
1305 uschar *originator_home = US"/";
1309 struct stat statbuf;
1310 pid_t passed_qr_pid = (pid_t)0;
1311 int passed_qr_pipe = -1;
1312 gid_t group_list[NGROUPS_MAX];
1314 /* Possible options for -R and -S */
1316 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1318 /* Need to define this in case we need to change the environment in order
1319 to get rid of a bogus time zone. We have to make it char rather than uschar
1320 because some OS define it in /usr/include/unistd.h. */
1322 extern char **environ;
1324 /* If the Exim user and/or group and/or the configuration file owner/group were
1325 defined by ref:name at build time, we must now find the actual uid/gid values.
1326 This is a feature to make the lives of binary distributors easier. */
1328 #ifdef EXIM_USERNAME
1329 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1331 exim_gid = pw->pw_gid;
1335 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1341 #ifdef EXIM_GROUPNAME
1342 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1344 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1350 #ifdef CONFIGURE_OWNERNAME
1351 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1353 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1354 CONFIGURE_OWNERNAME);
1359 #ifdef CONFIGURE_GROUPNAME
1360 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1362 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1363 CONFIGURE_GROUPNAME);
1368 /* In the Cygwin environment, some initialization needs doing. It is fudged
1369 in by means of this macro. */
1375 /* Check a field which is patched when we are running Exim within its
1376 testing harness; do a fast initial check, and then the whole thing. */
1378 running_in_test_harness =
1379 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1381 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1382 at the start of a program; however, it seems that some environments do not
1383 follow this. A "strange" locale can affect the formatting of timestamps, so we
1386 setlocale(LC_ALL, "C");
1388 /* Set up the default handler for timing using alarm(). */
1390 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1392 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1393 because store_malloc writes a log entry on failure. */
1395 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1396 if (log_buffer == NULL)
1398 fprintf(stderr, "exim: failed to get store for log buffer\n");
1402 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1403 NULL when the daemon is run and the file is closed. We have to use this
1404 indirection, because some systems don't allow writing to the variable "stderr".
1407 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1409 /* Arrange for the PCRE regex library to use our store functions. Note that
1410 the normal calls are actually macros that add additional arguments for
1411 debugging purposes so we have to assign specially constructed functions here.
1412 The default is to use store in the stacking pool, but this is overridden in the
1413 regex_must_compile() function. */
1415 pcre_malloc = function_store_get;
1416 pcre_free = function_dummy_free;
1418 /* Ensure there is a big buffer for temporary use in several places. It is put
1419 in malloc store so that it can be freed for enlargement if necessary. */
1421 big_buffer = store_malloc(big_buffer_size);
1423 /* Set up the handler for the data request signal, and set the initial
1424 descriptive text. */
1426 set_process_info("initializing");
1427 os_restarting_signal(SIGUSR1, usr1_handler);
1429 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1430 in the daemon code. For the rest of Exim's uses, we ignore it. */
1432 signal(SIGHUP, SIG_IGN);
1434 /* We don't want to die on pipe errors as the code is written to handle
1435 the write error instead. */
1437 signal(SIGPIPE, SIG_IGN);
1439 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1440 set to SIG_IGN. This causes subprocesses that complete before the parent
1441 process waits for them not to hang around, so when Exim calls wait(), nothing
1442 is there. The wait() code has been made robust against this, but let's ensure
1443 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1444 ending status. We use sigaction rather than plain signal() on those OS where
1445 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1446 problem on AIX with this.) */
1450 struct sigaction act;
1451 act.sa_handler = SIG_DFL;
1452 sigemptyset(&(act.sa_mask));
1454 sigaction(SIGCHLD, &act, NULL);
1457 signal(SIGCHLD, SIG_DFL);
1460 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1465 /* Set up the version number. Set up the leading 'E' for the external form of
1466 message ids, set the pointer to the internal form, and initialize it to
1467 indicate no message being processed. */
1470 message_id_option[0] = '-';
1471 message_id_external = message_id_option + 1;
1472 message_id_external[0] = 'E';
1473 message_id = message_id_external + 1;
1476 /* Set the umask to zero so that any files that Exim creates using open() are
1477 created with the modes that it specifies. NOTE: Files created with fopen() have
1478 a problem, which was not recognized till rather late (February 2006). With this
1479 umask, such files will be world writeable. (They are all content scanning files
1480 in the spool directory, which isn't world-accessible, so this is not a
1481 disaster, but it's untidy.) I don't want to change this overall setting,
1482 however, because it will interact badly with the open() calls. Instead, there's
1483 now a function called modefopen() that fiddles with the umask while calling
1488 /* Precompile the regular expression for matching a message id. Keep this in
1489 step with the code that generates ids in the accept.c module. We need to do
1490 this here, because the -M options check their arguments for syntactic validity
1491 using mac_ismsgid, which uses this. */
1494 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1496 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1497 this seems to be a generally accepted convention, since one finds symbolic
1498 links called "mailq" in standard OS configurations. */
1500 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1501 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1504 receiving_message = FALSE;
1505 called_as = US"-mailq";
1508 /* If the program is called as "rmail" treat it as equivalent to
1509 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1510 i.e. preventing a single dot on a line from terminating the message, and
1511 returning with zero return code, even in cases of error (provided an error
1512 message has been sent). */
1514 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1515 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1518 called_as = US"-rmail";
1519 errors_sender_rc = EXIT_SUCCESS;
1522 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1523 this is a smail convention. */
1525 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1526 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1528 smtp_input = smtp_batched_input = TRUE;
1529 called_as = US"-rsmtp";
1532 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1533 this is a smail convention. */
1535 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1536 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1539 receiving_message = FALSE;
1540 called_as = US"-runq";
1543 /* If the program is called as "newaliases" treat it as equivalent to
1544 "exim -bi"; this is a sendmail convention. */
1546 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1547 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1550 receiving_message = FALSE;
1551 called_as = US"-newaliases";
1554 /* Save the original effective uid for a couple of uses later. It should
1555 normally be root, but in some esoteric environments it may not be. */
1557 original_euid = geteuid();
1559 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1560 to be the same as the real ones. This makes a difference only if Exim is setuid
1561 (or setgid) to something other than root, which could be the case in some
1562 special configurations. */
1564 real_uid = getuid();
1565 real_gid = getgid();
1567 if (real_uid == root_uid)
1573 /* If neither the original real uid nor the original euid was root, Exim is
1574 running in an unprivileged state. */
1576 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1578 /* If the first argument is --help, pretend there are no arguments. This will
1579 cause a brief message to be given. */
1581 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1583 /* Scan the program's arguments. Some can be dealt with right away; others are
1584 simply recorded for checking and handling afterwards. Do a high-level switch
1585 on the second character (the one after '-'), to save some effort. */
1587 for (i = 1; i < argc; i++)
1589 BOOL badarg = FALSE;
1590 uschar *arg = argv[i];
1594 /* An argument not starting with '-' is the start of a recipients list;
1595 break out of the options-scanning loop. */
1603 /* An option consistion of -- terminates the options */
1605 if (Ustrcmp(arg, "--") == 0)
1607 recipients_arg = i + 1;
1611 /* Handle flagged options */
1613 switchchar = arg[1];
1616 /* Make all -ex options synonymous with -oex arguments, since that
1617 is assumed by various callers. Also make -qR options synonymous with -R
1618 options, as that seems to be required as well. Allow for -qqR too, and
1619 the same for -S options. */
1621 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1622 Ustrncmp(arg+1, "qR", 2) == 0 ||
1623 Ustrncmp(arg+1, "qS", 2) == 0)
1625 switchchar = arg[2];
1628 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1630 switchchar = arg[3];
1632 queue_2stage = TRUE;
1635 /* Make -r synonymous with -f, since it is a documented alias */
1637 else if (arg[1] == 'r') switchchar = 'f';
1639 /* Make -ov synonymous with -v */
1641 else if (Ustrcmp(arg, "-ov") == 0)
1647 /* High-level switch on active initial letter */
1651 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1652 so has no need of it. */
1655 if (*argrest == 0) i++; /* Skip over the type */
1660 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1662 /* -bd: Run in daemon mode, awaiting SMTP connections.
1663 -bdf: Ditto, but in the foreground.
1666 if (*argrest == 'd')
1668 daemon_listen = TRUE;
1669 if (*(++argrest) == 'f') background_daemon = FALSE;
1670 else if (*argrest != 0) { badarg = TRUE; break; }
1673 /* -be: Run in expansion test mode */
1675 else if (*argrest == 'e')
1676 expansion_test = checking = TRUE;
1678 /* -bF: Run system filter test */
1680 else if (*argrest == 'F')
1682 filter_test |= FTEST_SYSTEM;
1683 if (*(++argrest) != 0) { badarg = TRUE; break; }
1684 if (++i < argc) filter_test_sfile = argv[i]; else
1686 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1691 /* -bf: Run user filter test
1692 -bfd: Set domain for filter testing
1693 -bfl: Set local part for filter testing
1694 -bfp: Set prefix for filter testing
1695 -bfs: Set suffix for filter testing
1698 else if (*argrest == 'f')
1700 if (*(++argrest) == 0)
1702 filter_test |= FTEST_USER;
1703 if (++i < argc) filter_test_ufile = argv[i]; else
1705 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1713 fprintf(stderr, "exim: string expected after %s\n", arg);
1716 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1717 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1718 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1719 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1720 else { badarg = TRUE; break; }
1724 /* -bh: Host checking - an IP address must follow. */
1726 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1728 if (++i >= argc) { badarg = TRUE; break; }
1729 sender_host_address = argv[i];
1730 host_checking = checking = log_testing_mode = TRUE;
1731 host_checking_callout = argrest[1] == 'c';
1734 /* -bi: This option is used by sendmail to initialize *the* alias file,
1735 though it has the -oA option to specify a different file. Exim has no
1736 concept of *the* alias file, but since Sun's YP make script calls
1737 sendmail this way, some support must be provided. */
1739 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1741 /* -bm: Accept and deliver message - the default option. Reinstate
1742 receiving_message, which got turned off for all -b options. */
1744 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1746 /* -bnq: For locally originating messages, do not qualify unqualified
1747 addresses. In the envelope, this causes errors; in header lines they
1750 else if (Ustrcmp(argrest, "nq") == 0)
1752 allow_unqualified_sender = FALSE;
1753 allow_unqualified_recipient = FALSE;
1756 /* -bpxx: List the contents of the mail queue, in various forms. If
1757 the option is -bpc, just a queue count is needed. Otherwise, if the
1758 first letter after p is r, then order is random. */
1760 else if (*argrest == 'p')
1762 if (*(++argrest) == 'c')
1765 if (*(++argrest) != 0) badarg = TRUE;
1769 if (*argrest == 'r')
1771 list_queue_option = 8;
1774 else list_queue_option = 0;
1778 /* -bp: List the contents of the mail queue, top-level only */
1780 if (*argrest == 0) {}
1782 /* -bpu: List the contents of the mail queue, top-level undelivered */
1784 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1786 /* -bpa: List the contents of the mail queue, including all delivered */
1788 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1790 /* Unknown after -bp[r] */
1800 /* -bP: List the configuration variables given as the address list.
1801 Force -v, so configuration errors get displayed. */
1803 else if (Ustrcmp(argrest, "P") == 0)
1805 list_options = TRUE;
1806 debug_selector |= D_v;
1807 debug_file = stderr;
1810 /* -brt: Test retry configuration lookup */
1812 else if (Ustrcmp(argrest, "rt") == 0)
1814 test_retry_arg = i + 1;
1818 /* -brw: Test rewrite configuration */
1820 else if (Ustrcmp(argrest, "rw") == 0)
1822 test_rewrite_arg = i + 1;
1826 /* -bS: Read SMTP commands on standard input, but produce no replies -
1827 all errors are reported by sending messages. */
1829 else if (Ustrcmp(argrest, "S") == 0)
1830 smtp_input = smtp_batched_input = receiving_message = TRUE;
1832 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1833 on standard output. */
1835 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1837 /* -bt: address testing mode */
1839 else if (Ustrcmp(argrest, "t") == 0)
1840 address_test_mode = checking = log_testing_mode = TRUE;
1842 /* -bv: verify addresses */
1844 else if (Ustrcmp(argrest, "v") == 0)
1845 verify_address_mode = checking = log_testing_mode = TRUE;
1847 /* -bvs: verify sender addresses */
1849 else if (Ustrcmp(argrest, "vs") == 0)
1851 verify_address_mode = checking = log_testing_mode = TRUE;
1852 verify_as_sender = TRUE;
1855 /* -bV: Print version string and support details */
1857 else if (Ustrcmp(argrest, "V") == 0)
1859 printf("Exim version %s #%s built %s\n", version_string,
1860 version_cnumber, version_date);
1861 printf("%s\n", CS version_copyright);
1862 version_printed = TRUE;
1863 show_whats_supported(stdout);
1870 /* -C: change configuration file list; ignore if it isn't really
1871 a change! Enforce a prefix check if required. */
1876 if(++i < argc) argrest = argv[i]; else
1877 { badarg = TRUE; break; }
1879 if (Ustrcmp(config_main_filelist, argrest) != 0)
1881 #ifdef ALT_CONFIG_PREFIX
1883 int len = Ustrlen(ALT_CONFIG_PREFIX);
1884 uschar *list = argrest;
1886 while((filename = string_nextinlist(&list, &sep, big_buffer,
1887 big_buffer_size)) != NULL)
1889 if ((Ustrlen(filename) < len ||
1890 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1891 Ustrstr(filename, "/../") != NULL) &&
1892 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1894 fprintf(stderr, "-C Permission denied\n");
1900 config_main_filelist = argrest;
1901 config_changed = TRUE;
1906 /* -D: set up a macro definition */
1909 #ifdef DISABLE_D_OPTION
1910 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1915 macro_item *mlast = NULL;
1918 uschar *s = argrest;
1920 while (isspace(*s)) s++;
1922 if (*s < 'A' || *s > 'Z')
1924 fprintf(stderr, "exim: macro name set by -D must start with "
1925 "an upper case letter\n");
1929 while (isalnum(*s) || *s == '_')
1931 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1935 if (ptr == 0) { badarg = TRUE; break; }
1936 while (isspace(*s)) s++;
1939 if (*s++ != '=') { badarg = TRUE; break; }
1940 while (isspace(*s)) s++;
1943 for (m = macros; m != NULL; m = m->next)
1945 if (Ustrcmp(m->name, name) == 0)
1947 fprintf(stderr, "exim: duplicated -D in command line\n");
1953 m = store_get(sizeof(macro_item) + Ustrlen(name));
1955 m->command_line = TRUE;
1956 if (mlast == NULL) macros = m; else mlast->next = m;
1957 Ustrcpy(m->name, name);
1958 m->replacement = string_copy(s);
1960 if (clmacro_count >= MAX_CLMACROS)
1962 fprintf(stderr, "exim: too many -D options on command line\n");
1965 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1971 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1972 The latter is now a no-op, retained for compatibility only. If -dd is used,
1973 debugging subprocesses of the daemon is disabled. */
1976 if (Ustrcmp(argrest, "ropcr") == 0)
1978 /* drop_cr = TRUE; */
1981 /* Use an intermediate variable so that we don't set debugging while
1982 decoding the debugging bits. */
1986 unsigned int selector = D_default;
1989 if (*argrest == 'd')
1991 debug_daemon = TRUE;
1995 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1996 debug_options_count, US"debug");
1997 debug_selector = selector;
2002 /* -E: This is a local error message. This option is not intended for
2003 external use at all, but is not restricted to trusted callers because it
2004 does no harm (just suppresses certain error messages) and if Exim is run
2005 not setuid root it won't always be trusted when it generates error
2006 messages using this option. If there is a message id following -E, point
2007 message_reference at it, for logging. */
2010 local_error_message = TRUE;
2011 if (mac_ismsgid(argrest)) message_reference = argrest;
2015 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2016 option, so it looks as if historically the -oex options are also callable
2017 without the leading -o. So we have to accept them. Before the switch,
2018 anything starting -oe has been converted to -e. Exim does not support all
2019 of the sendmail error options. */
2022 if (Ustrcmp(argrest, "e") == 0)
2024 arg_error_handling = ERRORS_SENDER;
2025 errors_sender_rc = EXIT_SUCCESS;
2027 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2028 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2029 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2030 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2035 /* -F: Set sender's full name, used instead of the gecos entry from
2036 the password file. Since users can usually alter their gecos entries,
2037 there's no security involved in using this instead. The data can follow
2038 the -F or be in the next argument. */
2043 if(++i < argc) argrest = argv[i]; else
2044 { badarg = TRUE; break; }
2046 originator_name = argrest;
2047 sender_name_forced = TRUE;
2051 /* -f: Set sender's address - this value is only actually used if Exim is
2052 run by a trusted user, or if untrusted_set_sender is set and matches the
2053 address, except that the null address can always be set by any user. The
2054 test for this happens later, when the value given here is ignored when not
2055 permitted. For an untrusted user, the actual sender is still put in Sender:
2056 if it doesn't match the From: header (unless no_local_from_check is set).
2057 The data can follow the -f or be in the next argument. The -r switch is an
2058 obsolete form of -f but since there appear to be programs out there that
2059 use anything that sendmail has ever supported, better accept it - the
2060 synonymizing is done before the switch above.
2062 At this stage, we must allow domain literal addresses, because we don't
2063 know what the setting of allow_domain_literals is yet. Ditto for trailing
2064 dots and strip_trailing_dot. */
2072 if (i+1 < argc) argrest = argv[++i]; else
2073 { badarg = TRUE; break; }
2077 sender_address = string_sprintf(""); /* Ensure writeable memory */
2081 uschar *temp = argrest + Ustrlen(argrest) - 1;
2082 while (temp >= argrest && isspace(*temp)) temp--;
2083 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2084 allow_domain_literals = TRUE;
2085 strip_trailing_dot = TRUE;
2086 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2087 &sender_address_domain, TRUE);
2088 allow_domain_literals = FALSE;
2089 strip_trailing_dot = FALSE;
2090 if (sender_address == NULL)
2092 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2093 return EXIT_FAILURE;
2096 sender_address_forced = TRUE;
2100 /* This is some Sendmail thing which can be ignored */
2105 /* -h: Set the hop count for an incoming message. Exim does not currently
2106 support this; it always computes it by counting the Received: headers.
2107 To put it in will require a change to the spool header file format. */
2112 if(++i < argc) argrest = argv[i]; else
2113 { badarg = TRUE; break; }
2115 if (!isdigit(*argrest)) badarg = TRUE;
2119 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2120 not to be documented for sendmail but mailx (at least) uses it) */
2123 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2128 receiving_message = FALSE;
2130 /* -MC: continue delivery of another message via an existing open
2131 file descriptor. This option is used for an internal call by the
2132 smtp transport when there is a pending message waiting to go to an
2133 address to which it has got a connection. Five subsequent arguments are
2134 required: transport name, host name, IP address, sequence number, and
2135 message_id. Transports may decline to create new processes if the sequence
2136 number gets too big. The channel is stdin. This (-MC) must be the last
2137 argument. There's a subsequent check that the real-uid is privileged.
2139 If we are running in the test harness. delay for a bit, to let the process
2140 that set this one up complete. This makes for repeatability of the logging,
2143 if (Ustrcmp(argrest, "C") == 0)
2147 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2148 return EXIT_FAILURE;
2151 if (msg_action_arg >= 0)
2153 fprintf(stderr, "exim: incompatible arguments\n");
2154 return EXIT_FAILURE;
2157 continue_transport = argv[++i];
2158 continue_hostname = argv[++i];
2159 continue_host_address = argv[++i];
2160 continue_sequence = Uatoi(argv[++i]);
2161 msg_action = MSG_DELIVER;
2162 msg_action_arg = ++i;
2163 forced_delivery = TRUE;
2164 queue_run_pid = passed_qr_pid;
2165 queue_run_pipe = passed_qr_pipe;
2167 if (!mac_ismsgid(argv[i]))
2169 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2171 return EXIT_FAILURE;
2174 if (running_in_test_harness) millisleep(500);
2178 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2179 precedes -MC (see above). The flag indicates that the host to which
2180 Exim is connected has accepted an AUTH sequence. */
2182 else if (Ustrcmp(argrest, "CA") == 0)
2184 smtp_authenticated = TRUE;
2188 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2189 it preceded -MC (see above) */
2191 else if (Ustrcmp(argrest, "CP") == 0)
2193 smtp_use_pipelining = TRUE;
2197 /* -MCQ: pass on the pid of the queue-running process that started
2198 this chain of deliveries and the fd of its synchronizing pipe; this
2199 is useful only when it precedes -MC (see above) */
2201 else if (Ustrcmp(argrest, "CQ") == 0)
2203 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2205 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2210 /* -MCS: set the smtp_use_size flag; this is useful only when it
2211 precedes -MC (see above) */
2213 else if (Ustrcmp(argrest, "CS") == 0)
2215 smtp_use_size = TRUE;
2219 /* -MCT: set the tls_offered flag; this is useful only when it
2220 precedes -MC (see above). The flag indicates that the host to which
2221 Exim is connected has offered TLS support. */
2224 else if (Ustrcmp(argrest, "CT") == 0)
2231 /* -M[x]: various operations on the following list of message ids:
2232 -M deliver the messages, ignoring next retry times and thawing
2233 -Mc deliver the messages, checking next retry times, no thawing
2234 -Mf freeze the messages
2235 -Mg give up on the messages
2236 -Mt thaw the messages
2237 -Mrm remove the messages
2238 In the above cases, this must be the last option. There are also the
2239 following options which are followed by a single message id, and which
2240 act on that message. Some of them use the "recipient" addresses as well.
2241 -Mar add recipient(s)
2242 -Mmad mark all recipients delivered
2243 -Mmd mark recipients(s) delivered
2250 else if (*argrest == 0)
2252 msg_action = MSG_DELIVER;
2253 forced_delivery = deliver_force_thaw = TRUE;
2255 else if (Ustrcmp(argrest, "ar") == 0)
2257 msg_action = MSG_ADD_RECIPIENT;
2258 one_msg_action = TRUE;
2260 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2261 else if (Ustrcmp(argrest, "es") == 0)
2263 msg_action = MSG_EDIT_SENDER;
2264 one_msg_action = TRUE;
2266 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2267 else if (Ustrcmp(argrest, "g") == 0)
2269 msg_action = MSG_DELIVER;
2270 deliver_give_up = TRUE;
2272 else if (Ustrcmp(argrest, "mad") == 0)
2274 msg_action = MSG_MARK_ALL_DELIVERED;
2276 else if (Ustrcmp(argrest, "md") == 0)
2278 msg_action = MSG_MARK_DELIVERED;
2279 one_msg_action = TRUE;
2281 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2282 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2283 else if (Ustrcmp(argrest, "vb") == 0)
2285 msg_action = MSG_SHOW_BODY;
2286 one_msg_action = TRUE;
2288 else if (Ustrcmp(argrest, "vh") == 0)
2290 msg_action = MSG_SHOW_HEADER;
2291 one_msg_action = TRUE;
2293 else if (Ustrcmp(argrest, "vl") == 0)
2295 msg_action = MSG_SHOW_LOG;
2296 one_msg_action = TRUE;
2298 else { badarg = TRUE; break; }
2300 /* All the -Mxx options require at least one message id. */
2302 msg_action_arg = i + 1;
2303 if (msg_action_arg >= argc)
2305 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2306 return EXIT_FAILURE;
2309 /* Some require only message ids to follow */
2311 if (!one_msg_action)
2314 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2316 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2318 return EXIT_FAILURE;
2320 goto END_ARG; /* Remaining args are ids */
2323 /* Others require only one message id, possibly followed by addresses,
2324 which will be handled as normal arguments. */
2328 if (!mac_ismsgid(argv[msg_action_arg]))
2330 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2331 argv[msg_action_arg], arg);
2332 return EXIT_FAILURE;
2339 /* Some programs seem to call the -om option without the leading o;
2340 for sendmail it askes for "me too". Exim always does this. */
2343 if (*argrest != 0) badarg = TRUE;
2347 /* -N: don't do delivery - a debugging option that stops transports doing
2348 their thing. It implies debugging at the D_v level. */
2353 dont_deliver = TRUE;
2354 debug_selector |= D_v;
2355 debug_file = stderr;
2361 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2367 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2368 option to the specified value. This form uses long names. We need to handle
2369 -O option=value and -Ooption=value. */
2376 fprintf(stderr, "exim: string expected after -O\n");
2384 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2387 if (*argrest == 'A')
2389 alias_arg = argrest + 1;
2390 if (alias_arg[0] == 0)
2392 if (i+1 < argc) alias_arg = argv[++i]; else
2394 fprintf(stderr, "exim: string expected after -oA\n");
2400 /* -oB: Set a connection message max value for remote deliveries */
2402 else if (*argrest == 'B')
2404 uschar *p = argrest + 1;
2407 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2409 connection_max_messages = 1;
2418 fprintf(stderr, "exim: number expected after -oB\n");
2421 connection_max_messages = Uatoi(p);
2425 /* -odb: background delivery */
2427 else if (Ustrcmp(argrest, "db") == 0)
2429 synchronous_delivery = FALSE;
2430 arg_queue_only = FALSE;
2431 queue_only_set = TRUE;
2434 /* -odf: foreground delivery (smail-compatible option); same effect as
2435 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2438 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2440 synchronous_delivery = TRUE;
2441 arg_queue_only = FALSE;
2442 queue_only_set = TRUE;
2445 /* -odq: queue only */
2447 else if (Ustrcmp(argrest, "dq") == 0)
2449 synchronous_delivery = FALSE;
2450 arg_queue_only = TRUE;
2451 queue_only_set = TRUE;
2454 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2455 but no remote delivery */
2457 else if (Ustrcmp(argrest, "dqs") == 0)
2460 arg_queue_only = FALSE;
2461 queue_only_set = TRUE;
2464 /* -oex: Sendmail error flags. As these are also accepted without the
2465 leading -o prefix, for compatibility with vacation and other callers,
2466 they are handled with -e above. */
2468 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2469 -oitrue: Another sendmail syntax for the same */
2471 else if (Ustrcmp(argrest, "i") == 0 ||
2472 Ustrcmp(argrest, "itrue") == 0)
2475 /* -oM*: Set various characteristics for an incoming message; actually
2476 acted on for trusted callers only. */
2478 else if (*argrest == 'M')
2482 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2486 /* -oMa: Set sender host address */
2488 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2490 /* -oMaa: Set authenticator name */
2492 else if (Ustrcmp(argrest, "Maa") == 0)
2493 sender_host_authenticated = argv[++i];
2495 /* -oMas: setting authenticated sender */
2497 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2499 /* -oMai: setting authenticated id */
2501 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2503 /* -oMi: Set incoming interface address */
2505 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2507 /* -oMr: Received protocol */
2509 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2511 /* -oMs: Set sender host name */
2513 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2515 /* -oMt: Set sender ident */
2517 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2519 /* Else a bad argument */
2528 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2529 seem to call this as -m (undocumented), so that is also accepted (see
2532 else if (Ustrcmp(argrest, "m") == 0) {}
2534 /* -oo: An ancient flag for old-style addresses which still seems to
2535 crop up in some calls (see in SCO). */
2537 else if (Ustrcmp(argrest, "o") == 0) {}
2539 /* -oP <name>: set pid file path for daemon */
2541 else if (Ustrcmp(argrest, "P") == 0)
2542 override_pid_file_path = argv[++i];
2544 /* -or <n>: set timeout for non-SMTP acceptance
2545 -os <n>: set timeout for SMTP acceptance */
2547 else if (*argrest == 'r' || *argrest == 's')
2549 int *tp = (*argrest == 'r')?
2550 &arg_receive_timeout : &arg_smtp_receive_timeout;
2551 if (argrest[1] == 0)
2553 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2555 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2558 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2563 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2565 else if (Ustrcmp(argrest, "X") == 0)
2566 override_local_interfaces = argv[++i];
2568 /* Unknown -o argument */
2574 /* -ps: force Perl startup; -pd force delayed Perl startup */
2578 if (*argrest == 's' && argrest[1] == 0)
2580 perl_start_option = 1;
2583 if (*argrest == 'd' && argrest[1] == 0)
2585 perl_start_option = -1;
2590 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2591 which sets the host protocol and host name */
2595 if (i+1 < argc) argrest = argv[++i]; else
2596 { badarg = TRUE; break; }
2601 uschar *hn = Ustrchr(argrest, ':');
2604 received_protocol = argrest;
2608 received_protocol = string_copyn(argrest, hn - argrest);
2609 sender_host_name = hn + 1;
2616 receiving_message = FALSE;
2618 /* -qq...: Do queue runs in a 2-stage manner */
2620 if (*argrest == 'q')
2622 queue_2stage = TRUE;
2626 /* -qi...: Do only first (initial) deliveries */
2628 if (*argrest == 'i')
2630 queue_run_first_delivery = TRUE;
2634 /* -qf...: Run the queue, forcing deliveries
2635 -qff..: Ditto, forcing thawing as well */
2637 if (*argrest == 'f')
2639 queue_run_force = TRUE;
2640 if (*(++argrest) == 'f')
2642 deliver_force_thaw = TRUE;
2647 /* -q[f][f]l...: Run the queue only on local deliveries */
2649 if (*argrest == 'l')
2651 queue_run_local = TRUE;
2655 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2656 optionally starting from a given message id. */
2658 if (*argrest == 0 &&
2659 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2662 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2663 start_queue_run_id = argv[++i];
2664 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2665 stop_queue_run_id = argv[++i];
2668 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2669 optionally local only. */
2674 queue_interval = readconf_readtime(argrest, 0, FALSE);
2676 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2677 if (queue_interval <= 0)
2679 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2686 case 'R': /* Synonymous with -qR... */
2687 receiving_message = FALSE;
2689 /* -Rf: As -R (below) but force all deliveries,
2690 -Rff: Ditto, but also thaw all frozen messages,
2691 -Rr: String is regex
2692 -Rrf: Regex and force
2693 -Rrff: Regex and force and thaw
2695 in all cases provided there are no further characters in this
2701 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2703 if (Ustrcmp(argrest, rsopts[i]) == 0)
2705 if (i != 2) queue_run_force = TRUE;
2706 if (i >= 2) deliver_selectstring_regex = TRUE;
2707 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2708 argrest += Ustrlen(rsopts[i]);
2713 /* -R: Set string to match in addresses for forced queue run to
2714 pick out particular messages. */
2718 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2720 fprintf(stderr, "exim: string expected after -R\n");
2724 else deliver_selectstring = argrest;
2725 if (queue_interval < 0) queue_interval = 0;
2729 /* -r: an obsolete synonym for -f (see above) */
2732 /* -S: Like -R but works on sender. */
2734 case 'S': /* Synonymous with -qS... */
2735 receiving_message = FALSE;
2737 /* -Sf: As -S (below) but force all deliveries,
2738 -Sff: Ditto, but also thaw all frozen messages,
2739 -Sr: String is regex
2740 -Srf: Regex and force
2741 -Srff: Regex and force and thaw
2743 in all cases provided there are no further characters in this
2749 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2751 if (Ustrcmp(argrest, rsopts[i]) == 0)
2753 if (i != 2) queue_run_force = TRUE;
2754 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2755 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2756 argrest += Ustrlen(rsopts[i]);
2761 /* -S: Set string to match in addresses for forced queue run to
2762 pick out particular messages. */
2766 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2768 fprintf(stderr, "exim: string expected after -S\n");
2772 else deliver_selectstring_sender = argrest;
2773 if (queue_interval < 0) queue_interval = 0;
2776 /* -Tqt is an option that is exclusively for use by the testing suite.
2777 It is not recognized in other circumstances. It allows for the setting up
2778 of explicit "queue times" so that various warning/retry things can be
2779 tested. Otherwise variability of clock ticks etc. cause problems. */
2782 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2783 fudged_queue_times = argv[++i];
2788 /* -t: Set flag to extract recipients from body of message. */
2791 if (*argrest == 0) extract_recipients = TRUE;
2793 /* -ti: Set flag to extract recipients from body of message, and also
2794 specify that dot does not end the message. */
2796 else if (Ustrcmp(argrest, "i") == 0)
2798 extract_recipients = TRUE;
2802 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2805 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2812 /* -U: This means "initial user submission" in sendmail, apparently. The
2813 doc claims that in future sendmail may refuse syntactically invalid
2814 messages instead of fixing them. For the moment, we just ignore it. */
2820 /* -v: verify things - this is a very low-level debugging */
2825 debug_selector |= D_v;
2826 debug_file = stderr;
2832 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2834 The -x flag tells the sendmail command that mail from a local
2835 mail program has National Language Support (NLS) extended characters
2836 in the body of the mail item. The sendmail command can send mail with
2837 extended NLS characters across networks that normally corrupts these
2840 As Exim is 8-bit clean, it just ignores this flag. */
2843 if (*argrest != 0) badarg = TRUE;
2846 /* All other initial characters are errors */
2851 } /* End of high-level switch statement */
2853 /* Failed to recognize the option, or syntax error */
2857 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2858 "option %s\n", arg);
2864 /* Arguments have been processed. Check for incompatibilities. */
2868 (smtp_input || extract_recipients || recipients_arg < argc) &&
2869 (daemon_listen || queue_interval >= 0 || bi_option ||
2870 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2871 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2874 msg_action_arg > 0 &&
2875 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2876 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2879 (daemon_listen || queue_interval >= 0) &&
2880 (sender_address != NULL || list_options || list_queue || checking ||
2884 daemon_listen && queue_interval == 0
2888 (checking || smtp_input || extract_recipients ||
2889 filter_test != FTEST_NONE || bi_option)
2892 verify_address_mode &&
2893 (address_test_mode || smtp_input || extract_recipients ||
2894 filter_test != FTEST_NONE || bi_option)
2897 address_test_mode && (smtp_input || extract_recipients ||
2898 filter_test != FTEST_NONE || bi_option)
2901 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2905 deliver_selectstring != NULL && queue_interval < 0
2909 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2913 /* If debugging is set up, set the file and the file descriptor to pass on to
2914 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2915 to run in the foreground. */
2917 if (debug_selector != 0)
2919 debug_file = stderr;
2920 debug_fd = fileno(debug_file);
2921 background_daemon = FALSE;
2922 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2923 if (debug_selector != D_v) /* -v only doesn't show this */
2925 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2926 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2928 show_whats_supported(stderr);
2932 /* When started with root privilege, ensure that the limits on the number of
2933 open files and the number of processes (where that is accessible) are
2934 sufficiently large, or are unset, in case Exim has been called from an
2935 environment where the limits are screwed down. Not all OS have the ability to
2936 change some of these limits. */
2940 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2946 #ifdef RLIMIT_NOFILE
2947 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2949 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2951 rlp.rlim_cur = rlp.rlim_max = 0;
2954 /* I originally chose 1000 as a nice big number that was unlikely to
2955 be exceeded. It turns out that some older OS have a fixed upper limit of
2958 if (rlp.rlim_cur < 1000)
2960 rlp.rlim_cur = rlp.rlim_max = 1000;
2961 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2963 rlp.rlim_cur = rlp.rlim_max = 256;
2964 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2965 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2972 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2974 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2976 rlp.rlim_cur = rlp.rlim_max = 0;
2979 #ifdef RLIM_INFINITY
2980 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2982 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2984 if (rlp.rlim_cur < 1000)
2986 rlp.rlim_cur = rlp.rlim_max = 1000;
2988 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2989 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2995 /* Exim is normally entered as root (but some special configurations are
2996 possible that don't do this). However, it always spins off sub-processes that
2997 set their uid and gid as required for local delivery. We don't want to pass on
2998 any extra groups that root may belong to, so we want to get rid of them all at
3001 We need to obey setgroups() at this stage, before possibly giving up root
3002 privilege for a changed configuration file, but later on we might need to
3003 check on the additional groups for the admin user privilege - can't do that
3004 till after reading the config, which might specify the exim gid. Therefore,
3005 save the group list here first. */
3007 group_count = getgroups(NGROUPS_MAX, group_list);
3009 /* There is a fundamental difference in some BSD systems in the matter of
3010 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3011 known not to be different. On the "different" systems there is a single group
3012 list, and the first entry in it is the current group. On all other versions of
3013 Unix there is a supplementary group list, which is in *addition* to the current
3014 group. Consequently, to get rid of all extraneous groups on a "standard" system
3015 you pass over 0 groups to setgroups(), while on a "different" system you pass
3016 over a single group - the current group, which is always the first group in the
3017 list. Calling setgroups() with zero groups on a "different" system results in
3018 an error return. The following code should cope with both types of system.
3020 However, if this process isn't running as root, setgroups() can't be used
3021 since you have to be root to run it, even if throwing away groups. Not being
3022 root here happens only in some unusual configurations. We just ignore the
3025 if (setgroups(0, NULL) != 0)
3027 if (setgroups(1, group_list) != 0 && !unprivileged)
3029 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3034 /* If the configuration file name has been altered by an argument on the
3035 command line (either a new file name or a macro definition) and the caller is
3036 not root or the exim user, or if this is a filter testing run, remove any
3037 setuid privilege the program has, and run as the underlying user.
3039 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3040 severely restricts the use of -C for some purposes.
3042 Otherwise, set the real ids to the effective values (should be root unless run
3043 from inetd, which it can either be root or the exim uid, if one is configured).
3045 There is a private mechanism for bypassing some of this, in order to make it
3046 possible to test lots of configurations automatically, without having either to
3047 recompile each time, or to patch in an actual configuration file name and other
3048 values (such as the path name). If running in the test harness, pretend that
3049 configuration file changes and macro definitions haven't happened. */
3052 (config_changed || macros != NULL) && /* Config changed, and */
3053 real_uid != root_uid && /* Not root, and */
3054 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3055 real_uid != exim_uid && /* Not exim, and */
3057 !running_in_test_harness /* Not fudged */
3059 expansion_test /* expansion testing */
3061 filter_test != FTEST_NONE) /* Filter testing */
3063 setgroups(group_count, group_list);
3064 exim_setugid(real_uid, real_gid, FALSE,
3065 US"-C, -D, -be or -bf forces real uid");
3066 removed_privilege = TRUE;
3068 /* In the normal case when Exim is called like this, stderr is available
3069 and should be used for any logging information because attempts to write
3070 to the log will usually fail. To arrange this, we unset really_exim. However,
3071 if no stderr is available there is no point - we might as well have a go
3072 at the log (if it fails, syslog will be written). */
3074 if (log_stderr != NULL) really_exim = FALSE;
3077 /* Privilege is to be retained for the moment. It may be dropped later,
3078 depending on the job that this Exim process has been asked to do. For now, set
3079 the real uid to the effective so that subsequent re-execs of Exim are done by a
3082 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3084 /* If testing a filter, open the file(s) now, before wasting time doing other
3085 setups and reading the message. */
3087 if ((filter_test & FTEST_SYSTEM) != 0)
3089 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3092 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3094 return EXIT_FAILURE;
3098 if ((filter_test & FTEST_USER) != 0)
3100 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3103 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3105 return EXIT_FAILURE;
3109 /* Read the main runtime configuration data; this gives up if there
3110 is a failure. It leaves the configuration file open so that the subsequent
3111 configuration data for delivery can be read if needed. */
3115 /* Handle the decoding of logging options. */
3117 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3118 log_options, log_options_count, US"log");
3122 debug_printf("configuration file is %s\n", config_main_filename);
3123 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3124 log_extra_selector);
3127 /* If domain literals are not allowed, check the sender address that was
3128 supplied with -f. Ditto for a stripped trailing dot. */
3130 if (sender_address != NULL)
3132 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3134 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3135 "allowed\n", sender_address);
3136 return EXIT_FAILURE;
3138 if (f_end_dot && !strip_trailing_dot)
3140 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3141 "(trailing dot not allowed)\n", sender_address);
3142 return EXIT_FAILURE;
3146 /* Paranoia check of maximum lengths of certain strings. There is a check
3147 on the length of the log file path in log.c, which will come into effect
3148 if there are any calls to write the log earlier than this. However, if we
3149 get this far but the string is very long, it is better to stop now than to
3150 carry on and (e.g.) receive a message and then have to collapse. The call to
3151 log_write() from here will cause the ultimate panic collapse if the complete
3152 file name exceeds the buffer length. */
3154 if (Ustrlen(log_file_path) > 200)
3155 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3156 "log_file_path is longer than 200 chars: aborting");
3158 if (Ustrlen(pid_file_path) > 200)
3159 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3160 "pid_file_path is longer than 200 chars: aborting");
3162 if (Ustrlen(spool_directory) > 200)
3163 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3164 "spool_directory is longer than 200 chars: aborting");
3166 /* Length check on the process name given to syslog for its TAG field,
3167 which is only permitted to be 32 characters or less. See RFC 3164. */
3169 if (Ustrlen(syslog_processname) > 32)
3170 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3171 "syslog_processname is longer than 32 chars: aborting");
3173 /* In some operating systems, the environment variable TMPDIR controls where
3174 temporary files are created; Exim doesn't use these (apart from when delivering
3175 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3176 If TMPDIR is found in the environment, reset it to the value defined in the
3177 TMPDIR macro, if this macro is defined. */
3182 for (p = USS environ; *p != NULL; p++)
3184 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3185 Ustrcmp(*p+7, TMPDIR) != 0)
3187 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3188 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3190 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3196 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3197 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3198 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3199 called by a user who has set the TZ variable. This then affects the timestamps
3200 in log files and in Received: headers, and any created Date: header lines. The
3201 required timezone is settable in the configuration file, so nothing can be done
3202 about this earlier - but hopefully nothing will normally be logged earlier than
3203 this. We have to make a new environment if TZ is wrong, but don't bother if
3204 timestamps_utc is set, because then all times are in UTC anyway. */
3206 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3208 timestamps_utc = TRUE;
3212 uschar *envtz = US getenv("TZ");
3213 if ((envtz == NULL && timezone_string != NULL) ||
3215 (timezone_string == NULL ||
3216 Ustrcmp(timezone_string, envtz) != 0)))
3218 uschar **p = USS environ;
3222 while (*p++ != NULL) count++;
3223 if (envtz == NULL) count++;
3224 newp = new = malloc(sizeof(uschar *) * (count + 1));
3225 for (p = USS environ; *p != NULL; p++)
3227 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3230 if (timezone_string != NULL)
3232 *newp = malloc(Ustrlen(timezone_string) + 4);
3233 sprintf(CS *newp++, "TZ=%s", timezone_string);
3238 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3239 tod_stamp(tod_log));
3243 /* Handle the case when we have removed the setuid privilege because of -C or
3244 -D. This means that the caller of Exim was not root, and, provided that
3245 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3248 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3249 were running as the exim user defined in the configuration file (different to
3250 the one in the binary). The sysadmin may expect this case to retain privilege
3251 because "the binary was called by the Exim user", but it hasn't, because of the
3252 order in which it handles this stuff. There are two possibilities:
3254 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3255 to do message deliveries. Thus, the fact that it is running as a
3256 non-privileged user is plausible, and might be wanted in some special
3257 configurations. However, really_exim will have been set false when
3258 privilege was dropped, to stop Exim trying to write to its normal log
3259 files. Therefore, re-enable normal log processing, assuming the sysadmin
3260 has set up the log directory correctly.
3262 (2) If deliver_drop_privilege is not set, the configuration won't work as
3263 apparently intended, and so we log a panic message. In order to retain
3264 root for -C or -D, the caller must either be root or the Exim user
3265 defined in the binary (when deliver_drop_ privilege is false).
3267 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3268 built-in exim user or one defined in the configuration. In either event,
3269 re-enable log processing, assuming the sysadmin knows what they are doing. */
3271 if (removed_privilege && (config_changed || macros != NULL) &&
3272 real_uid == exim_uid)
3274 #ifdef ALT_CONFIG_ROOT_ONLY
3275 really_exim = TRUE; /* let logging work normally */
3278 if (deliver_drop_privilege)
3279 really_exim = TRUE; /* let logging work normally */
3281 log_write(0, LOG_MAIN|LOG_PANIC,
3282 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3283 (int)exim_uid, config_changed? "-C" : "-D");
3287 /* Start up Perl interpreter if Perl support is configured and there is a
3288 perl_startup option, and the configuration or the command line specifies
3289 initializing starting. Note that the global variables are actually called
3290 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3293 if (perl_start_option != 0)
3294 opt_perl_at_start = (perl_start_option > 0);
3295 if (opt_perl_at_start && opt_perl_startup != NULL)
3298 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3299 errstr = init_perl(opt_perl_startup);
3302 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3303 return EXIT_FAILURE;
3305 opt_perl_started = TRUE;
3307 #endif /* EXIM_PERL */
3309 /* Log the arguments of the call if the configuration file said so. This is
3310 a debugging feature for finding out what arguments certain MUAs actually use.
3311 Don't attempt it if logging is disabled, or if listing variables or if
3312 verifying/testing addresses or expansions. */
3314 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3315 && really_exim && !list_options && !checking)
3318 uschar *p = big_buffer;
3320 (void)getcwd(CS p+4, big_buffer_size - 4);
3322 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3324 for (i = 0; i < argc; i++)
3326 int len = Ustrlen(argv[i]);
3329 if (p + len + 8 >= big_buffer + big_buffer_size)
3332 log_write(0, LOG_MAIN, "%s", big_buffer);
3333 Ustrcpy(big_buffer, "...");
3336 printing = string_printing(argv[i]);
3337 if (printing[0] == 0) quote = US"\""; else
3339 uschar *pp = printing;
3341 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3343 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3344 (p - big_buffer) - 4), printing, quote);
3348 if ((log_extra_selector & LX_arguments) != 0)
3349 log_write(0, LOG_MAIN, "%s", big_buffer);
3351 debug_printf("%s\n", big_buffer);
3354 /* Set the working directory to be the top-level spool directory. We don't rely
3355 on this in the code, which always uses fully qualified names, but it's useful
3356 for core dumps etc. Don't complain if it fails - the spool directory might not
3357 be generally accessible and calls with the -C option (and others) have lost
3358 privilege by now. Before the chdir, we try to ensure that the directory exists.
3361 if (Uchdir(spool_directory) != 0)
3363 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3364 (void)Uchdir(spool_directory);
3367 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3368 alias file. Exim doesn't have such a concept, but this call is screwed into
3369 Sun's YP makefiles. Handle this by calling a configured script, as the real
3370 user who called Exim. The -oA option can be used to pass an argument to the
3375 (void)fclose(config_file);
3376 if (bi_command != NULL)
3380 argv[i++] = bi_command;
3381 if (alias_arg != NULL) argv[i++] = alias_arg;
3384 setgroups(group_count, group_list);
3385 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3387 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3388 (argv[1] == NULL)? US"" : argv[1]);
3390 execv(CS argv[0], (char *const *)argv);
3391 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3396 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3401 /* If an action on specific messages is requested, or if a daemon or queue
3402 runner is being started, we need to know if Exim was called by an admin user.
3403 This is the case if the real user is root or exim, or if the real group is
3404 exim, or if one of the supplementary groups is exim or a group listed in
3405 admin_groups. We don't fail all message actions immediately if not admin_user,
3406 since some actions can be performed by non-admin users. Instead, set admin_user
3407 for later interrogation. */
3409 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3415 for (i = 0; i < group_count; i++)
3417 if (group_list[i] == exim_gid) admin_user = TRUE;
3418 else if (admin_groups != NULL)
3420 for (j = 1; j <= (int)(admin_groups[0]); j++)
3421 if (admin_groups[j] == group_list[i])
3422 { admin_user = TRUE; break; }
3424 if (admin_user) break;
3428 /* Another group of privileged users are the trusted users. These are root,
3429 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3430 are permitted to specify sender_addresses with -f on the command line, and
3431 other message parameters as well. */
3433 if (real_uid == root_uid || real_uid == exim_uid)
3434 trusted_caller = TRUE;
3439 if (trusted_users != NULL)
3441 for (i = 1; i <= (int)(trusted_users[0]); i++)
3442 if (trusted_users[i] == real_uid)
3443 { trusted_caller = TRUE; break; }
3446 if (!trusted_caller && trusted_groups != NULL)
3448 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3450 if (trusted_groups[i] == real_gid)
3451 trusted_caller = TRUE;
3452 else for (j = 0; j < group_count; j++)
3454 if (trusted_groups[i] == group_list[j])
3455 { trusted_caller = TRUE; break; }
3457 if (trusted_caller) break;
3462 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3463 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3465 /* Only an admin user may start the daemon or force a queue run in the default
3466 configuration, but the queue run restriction can be relaxed. Only an admin
3467 user may request that a message be returned to its sender forthwith. Only an
3468 admin user may specify a debug level greater than D_v (because it might show
3469 passwords, etc. in lookup queries). Only an admin user may request a queue
3474 BOOL debugset = (debug_selector & ~D_v) != 0;
3475 if (deliver_give_up || daemon_listen ||
3476 (count_queue && queue_list_requires_admin) ||
3477 (list_queue && queue_list_requires_admin) ||
3478 (queue_interval >= 0 && prod_requires_admin) ||
3479 (debugset && !running_in_test_harness))
3481 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3486 /* If the real user is not root or the exim uid, the argument for passing
3487 in an open TCP/IP connection for another message is not permitted, nor is
3488 running with the -N option for any delivery action, unless this call to exim is
3489 one that supplied an input message, or we are using a patched exim for
3490 regression testing. */
3492 if (real_uid != root_uid && real_uid != exim_uid &&
3493 (continue_hostname != NULL ||
3495 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3496 )) && !running_in_test_harness)
3498 fprintf(stderr, "exim: Permission denied\n");
3499 return EXIT_FAILURE;
3502 /* If the caller is not trusted, certain arguments are ignored when running for
3503 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3504 Note that authority for performing certain actions on messages is tested in the
3505 queue_action() function. */
3507 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3509 sender_host_name = sender_host_address = interface_address =
3510 sender_ident = received_protocol = NULL;
3511 sender_host_port = interface_port = 0;
3512 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3515 /* If a sender host address is set, extract the optional port number off the
3516 end of it and check its syntax. Do the same thing for the interface address.
3517 Exim exits if the syntax is bad. */
3521 if (sender_host_address != NULL)
3522 sender_host_port = check_port(sender_host_address);
3523 if (interface_address != NULL)
3524 interface_port = check_port(interface_address);
3527 /* If an SMTP message is being received check to see if the standard input is a
3528 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3529 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3534 union sockaddr_46 inetd_sock;
3535 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3536 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3538 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3539 if (family == AF_INET || family == AF_INET6)
3541 union sockaddr_46 interface_sock;
3542 size = sizeof(interface_sock);
3544 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3545 interface_address = host_ntoa(-1, &interface_sock, NULL,
3548 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3550 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3553 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3554 NULL, &sender_host_port);
3555 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3556 "inetd is not supported when mua_wrapper is set");
3561 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3562 return EXIT_FAILURE;
3568 /* If the load average is going to be needed while receiving a message, get it
3569 now for those OS that require the first call to os_getloadavg() to be done as
3570 root. There will be further calls later for each message received. */
3572 #ifdef LOAD_AVG_NEEDS_ROOT
3573 if (receiving_message &&
3574 (queue_only_load >= 0 ||
3575 (is_inetd && smtp_load_reserve >= 0)
3578 load_average = os_getloadavg();
3582 /* The queue_only configuration option can be overridden by -odx on the command
3583 line, except that if queue_only_override is false, queue_only cannot be unset
3584 from the command line. */
3586 if (queue_only_set && (queue_only_override || arg_queue_only))
3587 queue_only = arg_queue_only;
3589 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3592 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3593 if (arg_smtp_receive_timeout >= 0)
3594 smtp_receive_timeout = arg_smtp_receive_timeout;
3596 /* If Exim was started with root privilege, unless we have already removed the
3597 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3598 except when starting the daemon or doing some kind of delivery or address
3599 testing (-bt). These are the only cases when root need to be retained. We run
3600 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3601 retained only for starting the daemon. */
3603 if (!unprivileged && /* originally had root AND */
3604 !removed_privilege && /* still got root AND */
3605 !daemon_listen && /* not starting the daemon */
3606 queue_interval <= 0 && /* (either kind of daemon) */
3608 deliver_drop_privilege || /* requested unprivileged */
3610 queue_interval < 0 && /* not running the queue */
3611 (msg_action_arg < 0 || /* and */
3612 msg_action != MSG_DELIVER) && /* not delivering and */
3613 (!checking || !address_test_mode) /* not address checking */
3617 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3620 /* When we are retaining a privileged uid, we still change to the exim gid. */
3622 else setgid(exim_gid);
3624 /* Handle a request to list the delivery queue */
3628 set_process_info("listing the queue");
3629 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3633 /* Handle a request to count the delivery queue */
3637 set_process_info("counting the queue");
3642 /* Handle actions on specific messages, except for the force delivery action,
3643 which is done below. Some actions take a whole list of message ids, which
3644 are known to continue up to the end of the arguments. Others take a single
3645 message id and then operate on the recipients list. */
3647 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3649 int yield = EXIT_SUCCESS;
3650 set_process_info("acting on specified messages");
3652 if (!one_msg_action)
3654 for (i = msg_action_arg; i < argc; i++)
3655 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3656 yield = EXIT_FAILURE;
3659 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3660 recipients_arg)) yield = EXIT_FAILURE;
3664 /* All the modes below here require the remaining configuration sections
3665 to be read, except that we can skip over the ACL setting when delivering
3666 specific messages, or doing a queue run. (For various testing cases we could
3667 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3670 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3672 /* The configuration data will have been read into POOL_PERM because we won't
3673 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3674 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3675 configuration were read into POOL_MAIN, because we don't do any resets till
3676 later on. However, it seems right, and it does ensure that both pools get used.
3679 store_pool = POOL_MAIN;
3681 /* Handle the -brt option. This is for checking out retry configurations.
3682 The next three arguments are a domain name or a complete address, and
3683 optionally two error numbers. All it does is to call the function that
3684 scans the retry configuration data. */
3686 if (test_retry_arg >= 0)
3688 retry_config *yield;
3689 int basic_errno = 0;
3693 if (test_retry_arg >= argc)
3695 printf("-brt needs a domain or address argument\n");
3696 exim_exit(EXIT_FAILURE);
3698 s1 = argv[test_retry_arg++];
3701 /* If the first argument contains no @ and no . it might be a local user
3702 or it might be a single-component name. Treat as a domain. */
3704 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3706 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3707 "being \ntreated as a one-component domain, not as a local part.\n\n",
3711 /* There may be an optional second domain arg. */
3713 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3714 s2 = argv[test_retry_arg++];
3716 /* The final arg is an error name */
3718 if (test_retry_arg < argc)
3720 uschar *ss = argv[test_retry_arg];
3722 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3725 printf("%s\n", CS error);
3726 return EXIT_FAILURE;
3729 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3730 an error is for matching codes to the decade. Turn them into a real error
3731 code, off the decade. */
3733 if (basic_errno == ERRNO_RCPT4XX)
3735 int code = (more_errno >> 8) & 255;
3737 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3738 else if (code > 100)
3739 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3743 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3744 if (yield == NULL) printf("No retry information found\n"); else
3747 more_errno = yield->more_errno;
3748 printf("Retry rule: %s ", yield->pattern);
3750 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3752 printf("quota%s%s ",
3753 (more_errno > 0)? "_" : "",
3754 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3756 else if (yield->basic_errno == ECONNREFUSED)
3758 printf("refused%s%s ",
3759 (more_errno > 0)? "_" : "",
3760 (more_errno == 'M')? "MX" :
3761 (more_errno == 'A')? "A" : "");
3763 else if (yield->basic_errno == ETIMEDOUT)
3766 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3768 if (more_errno != 0) printf("_%s",
3769 (more_errno == 'M')? "MX" : "A");
3772 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3773 printf("auth_failed ");
3776 for (r = yield->rules; r != NULL; r = r->next)
3778 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3779 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3785 printf(",%d.", x/1000);
3799 exim_exit(EXIT_SUCCESS);
3802 /* Handle a request to list one or more configuration options */
3806 set_process_info("listing variables");
3807 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3808 else for (i = recipients_arg; i < argc; i++)
3811 (Ustrcmp(argv[i], "router") == 0 ||
3812 Ustrcmp(argv[i], "transport") == 0 ||
3813 Ustrcmp(argv[i], "authenticator") == 0))
3815 readconf_print(argv[i+1], argv[i]);
3818 else readconf_print(argv[i], NULL);
3820 exim_exit(EXIT_SUCCESS);
3824 /* Handle a request to deliver one or more messages that are already on the
3825 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3826 is typically used for a small number when prodding by hand (when the option
3827 forced_delivery will be set) or when re-execing to regain root privilege.
3828 Each message delivery must happen in a separate process, so we fork a process
3829 for each one, and run them sequentially so that debugging output doesn't get
3830 intertwined, and to avoid spawning too many processes if a long list is given.
3831 However, don't fork for the last one; this saves a process in the common case
3832 when Exim is called to deliver just one message. */
3834 if (msg_action_arg > 0)
3836 if (prod_requires_admin && !admin_user)
3838 fprintf(stderr, "exim: Permission denied\n");
3839 exim_exit(EXIT_FAILURE);
3841 set_process_info("delivering specified messages");
3842 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3843 for (i = msg_action_arg; i < argc; i++)
3848 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3849 else if ((pid = fork()) == 0)
3851 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3852 _exit(EXIT_SUCCESS);
3856 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3858 exim_exit(EXIT_FAILURE);
3862 exim_exit(EXIT_SUCCESS);
3866 /* If only a single queue run is requested, without SMTP listening, we can just
3867 turn into a queue runner, with an optional starting message id. */
3869 if (queue_interval == 0 && !daemon_listen)
3871 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3872 (start_queue_run_id == NULL)? US"" : US" starting at ",
3873 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3874 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3875 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3876 set_process_info("running the queue (single queue run)");
3877 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3878 exim_exit(EXIT_SUCCESS);
3882 /* Find the login name of the real user running this process. This is always
3883 needed when receiving a message, because it is written into the spool file. It
3884 may also be used to construct a from: or a sender: header, and in this case we
3885 need the user's full name as well, so save a copy of it, checked for RFC822
3886 syntax and munged if necessary, if it hasn't previously been set by the -F
3887 argument. We may try to get the passwd entry more than once, in case NIS or
3888 other delays are in evidence. Save the home directory for use in filter testing
3893 if ((pw = getpwuid(real_uid)) != NULL)
3895 originator_login = string_copy(US pw->pw_name);
3896 originator_home = string_copy(US pw->pw_dir);
3898 /* If user name has not been set by -F, set it from the passwd entry
3899 unless -f has been used to set the sender address by a trusted user. */
3901 if (originator_name == NULL)
3903 if (sender_address == NULL ||
3904 (!trusted_caller && filter_test == FTEST_NONE))
3906 uschar *name = US pw->pw_gecos;
3907 uschar *amp = Ustrchr(name, '&');
3910 /* Most Unix specify that a '&' character in the gecos field is
3911 replaced by a copy of the login name, and some even specify that
3912 the first character should be upper cased, so that's what we do. */
3917 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3918 amp - name, name, &loffset, originator_login, amp + 1);
3919 buffer[loffset] = toupper(buffer[loffset]);
3923 /* If a pattern for matching the gecos field was supplied, apply
3924 it and then expand the name string. */
3926 if (gecos_pattern != NULL && gecos_name != NULL)
3929 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3931 if (regex_match_and_setup(re, name, 0, -1))
3933 uschar *new_name = expand_string(gecos_name);
3935 if (new_name != NULL)
3937 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3938 "gecos field \"%s\"\n", new_name, name);
3941 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3942 "\"%s\": %s\n", gecos_name, expand_string_message);
3944 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3945 "gecos field \"%s\"\n", gecos_pattern, name);
3946 store_free((void *)re);
3948 originator_name = string_copy(name);
3951 /* A trusted caller has used -f but not -F */
3953 else originator_name = US"";
3956 /* Break the retry loop */
3961 if (++i > finduser_retries) break;
3965 /* If we cannot get a user login, log the incident and give up, unless the
3966 configuration specifies something to use. When running in the test harness,
3967 any setting of unknown_login overrides the actual name. */
3969 if (originator_login == NULL || running_in_test_harness)
3971 if (unknown_login != NULL)
3973 originator_login = expand_string(unknown_login);
3974 if (originator_name == NULL && unknown_username != NULL)
3975 originator_name = expand_string(unknown_username);
3976 if (originator_name == NULL) originator_name = US"";
3978 if (originator_login == NULL)
3979 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3983 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3986 originator_name = string_copy(parse_fix_phrase(originator_name,
3987 Ustrlen(originator_name), big_buffer, big_buffer_size));
3989 /* If a message is created by this call of Exim, the uid/gid of its originator
3990 are those of the caller. These values are overridden if an existing message is
3991 read in from the spool. */
3993 originator_uid = real_uid;
3994 originator_gid = real_gid;
3996 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3997 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3999 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4000 returns. We leave this till here so that the originator_ fields are available
4001 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4004 if (daemon_listen || queue_interval > 0)
4008 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4009 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4010 "mua_wrapper is set");
4015 /* If the sender ident has not been set (by a trusted caller) set it to
4016 the caller. This will get overwritten below for an inetd call. If a trusted
4017 caller has set it empty, unset it. */
4019 if (sender_ident == NULL) sender_ident = originator_login;
4020 else if (sender_ident[0] == 0) sender_ident = NULL;
4022 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4023 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4024 originator_* variables set. */
4026 if (test_rewrite_arg >= 0)
4028 really_exim = FALSE;
4029 if (test_rewrite_arg >= argc)
4031 printf("-brw needs an address argument\n");
4032 exim_exit(EXIT_FAILURE);
4034 rewrite_test(argv[test_rewrite_arg]);
4035 exim_exit(EXIT_SUCCESS);
4038 /* A locally-supplied message is considered to be coming from a local user
4039 unless a trusted caller supplies a sender address with -f, or is passing in the
4040 message via SMTP (inetd invocation or otherwise). */
4042 if ((sender_address == NULL && !smtp_input) ||
4043 (!trusted_caller && filter_test == FTEST_NONE))
4045 sender_local = TRUE;
4047 /* A trusted caller can supply authenticated_sender and authenticated_id
4048 via -oMas and -oMai and if so, they will already be set. */
4050 if (authenticated_sender == NULL)
4051 authenticated_sender = string_sprintf("%s@%s", originator_login,
4052 qualify_domain_sender);
4053 if (authenticated_id == NULL) authenticated_id = originator_login;
4056 /* Trusted callers are always permitted to specify the sender address.
4057 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4058 is specified is the empty address. However, if a trusted caller does not
4059 specify a sender address for SMTP input, we leave sender_address unset. This
4060 causes the MAIL commands to be honoured. */
4062 if ((!smtp_input && sender_address == NULL) ||
4063 !receive_check_set_sender(sender_address))
4065 /* Either the caller is not permitted to set a general sender, or this is
4066 non-SMTP input and the trusted caller has not set a sender. If there is no
4067 sender, or if a sender other than <> is set, override with the originator's
4068 login (which will get qualified below), except when checking things. */
4070 if (sender_address == NULL /* No sender_address set */
4072 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4073 !checking && /* Not running tests, AND */
4074 filter_test == FTEST_NONE)) /* Not testing a filter */
4076 sender_address = originator_login;
4077 sender_address_forced = FALSE;
4078 sender_address_domain = 0;
4082 /* Remember whether an untrusted caller set the sender address */
4084 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4086 /* Ensure that the sender address is fully qualified unless it is the empty
4087 address, which indicates an error message, or doesn't exist (root caller, smtp
4088 interface, no -f argument). */
4090 if (sender_address != NULL && sender_address[0] != 0 &&
4091 sender_address_domain == 0)
4092 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4093 qualify_domain_sender);
4095 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4097 /* Handle a request to verify a list of addresses, or test them for delivery.
4098 This must follow the setting of the sender address, since routers can be
4099 predicated upon the sender. If no arguments are given, read addresses from
4100 stdin. Set debug_level to at least D_v to get full output for address testing.
4103 if (verify_address_mode || address_test_mode)
4106 int flags = vopt_qualify;
4108 if (verify_address_mode)
4110 if (!verify_as_sender) flags |= vopt_is_recipient;
4111 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4116 flags |= vopt_is_recipient;
4117 debug_selector |= D_v;
4118 debug_file = stderr;
4119 debug_fd = fileno(debug_file);
4120 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4123 if (recipients_arg < argc)
4125 while (recipients_arg < argc)
4127 uschar *s = argv[recipients_arg++];
4130 BOOL finished = FALSE;
4131 uschar *ss = parse_find_address_end(s, FALSE);
4132 if (*ss == ',') *ss = 0; else finished = TRUE;
4133 test_address(s, flags, &exit_value);
4136 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4143 uschar *s = get_stdinput(NULL, NULL);
4144 if (s == NULL) break;
4145 test_address(s, flags, &exit_value);
4149 exim_exit(exit_value);
4152 /* Handle expansion checking */
4156 if (recipients_arg < argc)
4158 while (recipients_arg < argc)
4160 uschar *s = argv[recipients_arg++];
4161 uschar *ss = expand_string(s);
4163 printf ("Failed: %s\n", expand_string_message);
4164 else printf("%s\n", CS ss);
4172 char *(*fn_readline)(char *) = NULL;
4173 char *(*fn_addhist)(char *) = NULL;
4176 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4182 uschar *source = get_stdinput(fn_readline, fn_addhist);
4183 if (source == NULL) break;
4184 ss = expand_string(source);
4186 printf ("Failed: %s\n", expand_string_message);
4187 else printf("%s\n", CS ss);
4191 if (dlhandle != NULL) dlclose(dlhandle);
4195 exim_exit(EXIT_SUCCESS);
4199 /* The active host name is normally the primary host name, but it can be varied
4200 for hosts that want to play several parts at once. We need to ensure that it is
4201 set for host checking, and for receiving messages. */
4203 smtp_active_hostname = primary_hostname;
4204 if (raw_active_hostname != NULL)
4206 uschar *nah = expand_string(raw_active_hostname);
4209 if (!expand_string_forcedfail)
4210 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4211 "(smtp_active_hostname): %s", raw_active_hostname,
4212 expand_string_message);
4214 else if (nah[0] != 0) smtp_active_hostname = nah;
4217 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4218 given IP address so that the blocking and relay configuration can be tested. An
4219 RFC 1413 call is made only if we are running in the test harness and an
4220 incoming interface and both ports are specified, because there is no TCP/IP
4221 call to find the ident for. */
4228 sender_ident = NULL;
4229 if (running_in_test_harness && sender_host_port != 0 &&
4230 interface_address != NULL && interface_port != 0)
4231 verify_get_ident(1413);
4233 /* In case the given address is a non-canonical IPv6 address, canonicize
4234 it. The code works for both IPv4 and IPv6, as it happens. */
4236 size = host_aton(sender_host_address, x);
4237 sender_host_address = store_get(48); /* large enough for full IPv6 */
4238 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4240 /* Now set up for testing */
4242 host_build_sender_fullhost();
4246 sender_local = FALSE;
4247 sender_host_notsocket = TRUE;
4248 debug_file = stderr;
4249 debug_fd = fileno(debug_file);
4250 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4251 "**** but without any ident (RFC 1413) callback.\n"
4252 "**** This is not for real!\n\n",
4253 sender_host_address);
4255 if (verify_check_host(&hosts_connection_nolog) == OK)
4256 log_write_selector &= ~L_smtp_connection;
4257 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4259 if (smtp_start_session())
4261 reset_point = store_get(0);
4264 store_reset(reset_point);
4265 if (smtp_setup_msg() <= 0) break;
4266 if (!receive_msg(FALSE)) break;
4269 exim_exit(EXIT_SUCCESS);
4273 /* Arrange for message reception if recipients or SMTP were specified;
4274 otherwise complain unless a version print (-bV) happened or this is a filter
4275 verification test. In the former case, show the configuration file name. */
4277 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4279 if (version_printed)
4281 printf("Configuration file is %s\n", config_main_filename);
4282 return EXIT_SUCCESS;
4284 if (filter_test == FTEST_NONE)
4287 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4288 "not directly from a shell command line. Options and/or arguments control\n"
4289 "what it does when called. For a list of options, see the Exim documentation.\n");
4290 return EXIT_FAILURE;
4295 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4296 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4297 that we are not called from inetd, because that is rejected above. The
4298 following configuration settings are forced here:
4300 (1) Synchronous delivery (-odi)
4301 (2) Errors to stderr (-oep == -oeq)
4302 (3) No parallel remote delivery
4303 (4) Unprivileged delivery
4305 We don't force overall queueing options because there are several of them;
4306 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4307 to override any SMTP queueing. */
4311 synchronous_delivery = TRUE;
4312 arg_error_handling = ERRORS_STDERR;
4313 remote_max_parallel = 1;
4314 deliver_drop_privilege = TRUE;
4316 queue_smtp_domains = NULL;
4320 /* Prepare to accept one or more new messages on the standard input. When a
4321 message has been read, its id is returned in message_id[]. If doing immediate
4322 delivery, we fork a delivery process for each received message, except for the
4323 last one, where we can save a process switch.
4325 It is only in non-smtp mode that error_handling is allowed to be changed from
4326 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4327 sendmail error modes other than -oem ever actually used? Later: yes.) */
4329 if (!smtp_input) error_handling = arg_error_handling;
4331 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4332 logging being sent down the socket and make an identd call to get the
4337 (void)fclose(stderr);
4338 exim_nullstd(); /* Re-open to /dev/null */
4339 verify_get_ident(IDENT_PORT);
4340 host_build_sender_fullhost();
4341 set_process_info("handling incoming connection from %s via inetd",
4345 /* If the sender host address has been set, build sender_fullhost if it hasn't
4346 already been done (which it will have been for inetd). This caters for the
4347 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4348 so that the test for IP options is skipped for -bs input. */
4350 if (sender_host_address != NULL && sender_fullhost == NULL)
4352 host_build_sender_fullhost();
4353 set_process_info("handling incoming connection from %s via -oMa",
4355 sender_host_notsocket = TRUE;
4358 /* Otherwise, set the sender host as unknown except for inetd calls. This
4359 prevents host checking in the case of -bs not from inetd and also for -bS. */
4361 else if (!is_inetd) sender_host_unknown = TRUE;
4363 /* If stdout does not exist, then dup stdin to stdout. This can happen
4364 if exim is started from inetd. In this case fd 0 will be set to the socket,
4365 but fd 1 will not be set. This also happens for passed SMTP channels. */
4367 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4369 /* Set up the incoming protocol name and the state of the program. Root
4370 is allowed to force received protocol via the -oMr option above, and if we are
4371 in a non-local SMTP state it means we have come via inetd and the process info
4372 has already been set up. We don't set received_protocol here for smtp input,
4373 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4377 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4382 if (received_protocol == NULL)
4383 received_protocol = string_sprintf("local%s", called_as);
4384 set_process_info("accepting a local non-SMTP message from <%s>",
4388 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4392 local_queue_only = queue_only;
4394 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4395 the spool if so configured. On failure, we must not attempt to send an error
4396 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4397 error code is given.) */
4399 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4401 fprintf(stderr, "exim: insufficient disk space\n");
4402 return EXIT_FAILURE;
4405 /* If this is smtp input of any kind, handle the start of the SMTP
4412 if (verify_check_host(&hosts_connection_nolog) == OK)
4413 log_write_selector &= ~L_smtp_connection;
4414 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4415 if (!smtp_start_session())
4418 exim_exit(EXIT_SUCCESS);
4422 /* Otherwise, set up the input size limit here */
4426 thismessage_size_limit = expand_string_integer(message_size_limit);
4427 if (thismessage_size_limit < 0)
4429 if (thismessage_size_limit == -1)
4430 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4431 "message_size_limit: %s", expand_string_message);
4433 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4434 "message_size_limit: %s", expand_string_message);
4438 /* Loop for several messages when reading SMTP input. If we fork any child
4439 processes, we don't want to wait for them unless synchronous delivery is
4440 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4441 same as SIG_DFL, despite the fact that documentation often lists the default as
4442 "ignore". This is a confusing area. This is what I know:
4444 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4445 processes that complete simply to go away without ever becoming defunct. You
4446 can't then wait for them - but we don't want to wait for them in the
4447 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4448 happen for all OS (e.g. *BSD is different).
4450 But that's not the end of the story. Some (many? all?) systems have the
4451 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4452 has by default, so it seems that the difference is merely one of default
4453 (compare restarting vs non-restarting signals).
4455 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4456 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4457 of the loop below. Paranoia rules.
4459 February 2003: That's *still* not the end of the story. There are now versions
4460 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4461 process then calls waitpid(), a grumble is written to the system log, because
4462 this is logically inconsistent. In other words, it doesn't like the paranoia.
4463 As a consequenc of this, the waitpid() below is now excluded if we are sure
4464 that SIG_IGN works. */
4466 if (!synchronous_delivery)
4469 struct sigaction act;
4470 act.sa_handler = SIG_IGN;
4471 sigemptyset(&(act.sa_mask));
4472 act.sa_flags = SA_NOCLDWAIT;
4473 sigaction(SIGCHLD, &act, NULL);
4475 signal(SIGCHLD, SIG_IGN);
4479 /* Save the current store pool point, for resetting at the start of
4480 each message, and save the real sender address, if any. */
4482 reset_point = store_get(0);
4483 real_sender_address = sender_address;
4485 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4486 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4491 store_reset(reset_point);
4494 /* In the SMTP case, we have to handle the initial SMTP input and build the
4495 recipients list, before calling receive_msg() to read the message proper.
4496 Whatever sender address is actually given in the SMTP transaction is
4497 actually ignored for local senders - we use the actual sender, which is
4498 normally either the underlying user running this process or a -f argument
4499 provided by a trusted caller. It is saved in real_sender_address.
4501 However, if this value is NULL, we are dealing with a trusted caller when
4502 -f was not used; in this case, the SMTP sender is allowed to stand.
4504 Also, if untrusted_set_sender is set, we permit sender addresses that match
4505 anything in its list.
4507 The variable raw_sender_address holds the sender address before rewriting. */
4512 if ((rc = smtp_setup_msg()) > 0)
4514 if (real_sender_address != NULL &&
4515 !receive_check_set_sender(sender_address))
4517 sender_address = raw_sender = real_sender_address;
4518 sender_address_unrewritten = NULL;
4520 more = receive_msg(extract_recipients);
4521 if (message_id[0] == 0)
4524 exim_exit(EXIT_FAILURE);
4527 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4530 /* In the non-SMTP case, we have all the information from the command
4531 line, but must process it in case it is in the more general RFC822
4532 format, and in any case, to detect syntax errors. Also, it appears that
4533 the use of comma-separated lists as single arguments is common, so we
4534 had better support them. */
4540 int count = argc - recipients_arg;
4541 uschar **list = argv + recipients_arg;
4543 /* These options cannot be changed dynamically for non-SMTP messages */
4545 active_local_sender_retain = local_sender_retain;
4546 active_local_from_check = local_from_check;
4548 /* Save before any rewriting */
4550 raw_sender = string_copy(sender_address);
4552 /* Loop for each argument */
4554 for (i = 0; i < count; i++)
4556 int start, end, domain;
4558 uschar *s = list[i];
4560 /* Loop for each comma-separated address */
4564 BOOL finished = FALSE;
4566 uschar *ss = parse_find_address_end(s, FALSE);
4568 if (*ss == ',') *ss = 0; else finished = TRUE;
4570 /* Check max recipients - if -t was used, these aren't recipients */
4572 if (recipients_max > 0 && ++rcount > recipients_max &&
4573 !extract_recipients)
4575 if (error_handling == ERRORS_STDERR)
4577 fprintf(stderr, "exim: too many recipients\n");
4578 exim_exit(EXIT_FAILURE);
4583 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4584 errors_sender_rc : EXIT_FAILURE;
4589 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4591 if (domain == 0 && !allow_unqualified_recipient)
4594 errmess = US"unqualified recipient address not allowed";
4597 if (recipient == NULL)
4599 if (error_handling == ERRORS_STDERR)
4601 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4602 string_printing(list[i]), errmess);
4603 exim_exit(EXIT_FAILURE);
4609 eblock.text1 = string_printing(list[i]);
4610 eblock.text2 = errmess;
4612 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4613 errors_sender_rc : EXIT_FAILURE;
4617 receive_add_recipient(recipient, -1);
4620 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4624 /* Show the recipients when debugging */
4629 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4630 if (recipients_list != NULL)
4632 debug_printf("Recipients:\n");
4633 for (i = 0; i < recipients_count; i++)
4634 debug_printf(" %s\n", recipients_list[i].address);
4638 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4639 will just read the headers for the message, and not write anything onto the
4642 message_ended = END_NOTENDED;
4643 more = receive_msg(extract_recipients);
4645 /* more is always FALSE here (not SMTP message) when reading a message
4646 for real; when reading the headers of a message for filter testing,
4647 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4649 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4650 } /* Non-SMTP message reception */
4652 /* If this is a filter testing run, there are headers in store, but
4653 no message on the spool. Run the filtering code in testing mode, setting
4654 the domain to the qualify domain and the local part to the current user,
4655 unless they have been set by options. The prefix and suffix are left unset
4656 unless specified. The the return path is set to to the sender unless it has
4657 already been set from a return-path header in the message. */
4659 if (filter_test != FTEST_NONE)
4661 deliver_domain = (ftest_domain != NULL)?
4662 ftest_domain : qualify_domain_recipient;
4663 deliver_domain_orig = deliver_domain;
4664 deliver_localpart = (ftest_localpart != NULL)?
4665 ftest_localpart : originator_login;
4666 deliver_localpart_orig = deliver_localpart;
4667 deliver_localpart_prefix = ftest_prefix;
4668 deliver_localpart_suffix = ftest_suffix;
4669 deliver_home = originator_home;
4671 if (return_path == NULL)
4673 printf("Return-path copied from sender\n");
4674 return_path = string_copy(sender_address);
4678 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4680 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4682 receive_add_recipient(
4683 string_sprintf("%s%s%s@%s",
4684 (ftest_prefix == NULL)? US"" : ftest_prefix,
4686 (ftest_suffix == NULL)? US"" : ftest_suffix,
4687 deliver_domain), -1);
4689 printf("Recipient = %s\n", recipients_list[0].address);
4690 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4691 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4693 (void)chdir("/"); /* Get away from wherever the user is running this from */
4695 /* Now we run either a system filter test, or a user filter test, or both.
4696 In the latter case, headers added by the system filter will persist and be
4697 available to the user filter. We need to copy the filter variables
4700 if ((filter_test & FTEST_SYSTEM) != 0)
4702 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4703 exim_exit(EXIT_FAILURE);
4706 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4708 if ((filter_test & FTEST_USER) != 0)
4710 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4711 exim_exit(EXIT_FAILURE);
4714 exim_exit(EXIT_SUCCESS);
4717 /* Else act on the result of message reception. We should not get here unless
4718 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4719 TRUE. If it is not, check on the number of messages received in this
4720 connection. If that's OK and queue_only_load is set, check that the load
4721 average is below it. If it is not, set local_queue_only TRUE. Note that it
4722 then remains this way for any subsequent messages on the same SMTP connection.
4723 This is a deliberate choice; even though the load average may fall, it
4724 doesn't seem right to deliver later messages on the same call when not
4725 delivering earlier ones. */
4727 if (!local_queue_only)
4729 if (smtp_accept_queue_per_connection > 0 &&
4730 receive_messagecount > smtp_accept_queue_per_connection)
4732 local_queue_only = TRUE;
4733 queue_only_reason = 2;
4735 else if (queue_only_load >= 0)
4737 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4738 if (local_queue_only) queue_only_reason = 3;
4742 /* If running as an MUA wrapper, all queueing options and freezing options
4746 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4748 /* Log the queueing here, when it will get a message id attached, but
4749 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4752 if (local_queue_only) switch(queue_only_reason)
4755 log_write(L_delay_delivery,
4756 LOG_MAIN, "no immediate delivery: more than %d messages "
4757 "received in one connection", smtp_accept_queue_per_connection);
4761 log_write(L_delay_delivery,
4762 LOG_MAIN, "no immediate delivery: load average %.2f",
4763 (double)load_average/1000.0);
4767 /* Else do the delivery unless the ACL or local_scan() called for queue only
4768 or froze the message. Always deliver in a separate process. A fork failure is
4769 not a disaster, as the delivery will eventually happen on a subsequent queue
4770 run. The search cache must be tidied before the fork, as the parent will
4771 do it before exiting. The child will trigger a lookup failure and
4772 thereby defer the delivery if it tries to use (for example) a cached ldap
4773 connection that the parent has called unbind on. */
4775 else if (!queue_only_policy && !deliver_freeze)
4780 if ((pid = fork()) == 0)
4783 close_unwanted(); /* Close unwanted file descriptors and TLS */
4784 exim_nullstd(); /* Ensure std{in,out,err} exist */
4786 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4787 mode, deliver_drop_privilege is forced TRUE). */
4789 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4791 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4793 /* Control does not return here. */
4796 /* No need to re-exec */
4798 rc = deliver_message(message_id, FALSE, FALSE);
4800 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4801 EXIT_SUCCESS : EXIT_FAILURE);
4806 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4807 "process: %s", strerror(errno));
4810 /* In the parent, wait if synchronous delivery is required. This will
4811 always be the case in MUA wrapper mode. */
4813 else if (synchronous_delivery)
4816 while (wait(&status) != pid);
4817 if ((status & 0x00ff) != 0)
4818 log_write(0, LOG_MAIN|LOG_PANIC,
4819 "process %d crashed with signal %d while delivering %s",
4820 (int)pid, status & 0x00ff, message_id);
4821 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4825 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4826 automatically reaps children (see comments above the loop), clear away any
4827 finished subprocesses here, in case there are lots of messages coming in
4828 from the same source. */
4830 #ifndef SIG_IGN_WORKS
4831 while (waitpid(-1, NULL, WNOHANG) > 0);
4835 exim_exit(EXIT_SUCCESS); /* Never returns */
4836 return 0; /* To stop compiler warning */