1 /* $Cambridge: exim/src/src/exim.c,v 1.56 2007/06/19 14:41:31 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
390 filename the file name
391 options the fopen() options
392 mode the required mode
394 Returns: the fopened FILE or NULL
398 modefopen(uschar *filename, char *options, mode_t mode)
400 mode_t saved_umask = umask(0777);
401 FILE *f = Ufopen(filename, options);
402 (void)umask(saved_umask);
403 if (f != NULL) (void)fchmod(fileno(f), mode);
410 /*************************************************
411 * Ensure stdin, stdout, and stderr exist *
412 *************************************************/
414 /* Some operating systems grumble if an exec() happens without a standard
415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
416 file will be opened and will use these fd values, and then some other bit of
417 code will assume, for example, that it can write error messages to stderr.
418 This function ensures that fds 0, 1, and 2 are open if they do not already
419 exist, by connecting them to /dev/null.
421 This function is also used to ensure that std{in,out,err} exist at all times,
422 so that if any library that Exim calls tries to use them, it doesn't crash.
434 for (i = 0; i <= 2; i++)
436 if (fstat(i, &statbuf) < 0 && errno == EBADF)
438 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
439 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
440 string_open_failed(errno, "/dev/null"));
441 if (devnull != i) (void)dup2(devnull, i);
444 if (devnull > 2) (void)close(devnull);
450 /*************************************************
451 * Close unwanted file descriptors for delivery *
452 *************************************************/
454 /* This function is called from a new process that has been forked to deliver
455 an incoming message, either directly, or using exec.
457 We want any smtp input streams to be closed in this new process. However, it
458 has been observed that using fclose() here causes trouble. When reading in -bS
459 input, duplicate copies of messages have been seen. The files will be sharing a
460 file pointer with the parent process, and it seems that fclose() (at least on
461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
462 least sometimes. Hence we go for closing the underlying file descriptors.
464 If TLS is active, we want to shut down the TLS library, but without molesting
465 the parent's SSL connection.
467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
468 stderr unless debugging) because the calling process might have set them up as
469 pipes and be waiting for them to close before it waits for the submission
470 process to terminate. If they aren't closed, they hold up the calling process
471 until the initial delivery process finishes, which is not what we want.
473 Exception: We do want it for synchronous delivery!
475 And notwithstanding all the above, if D_resolver is set, implying resolver
476 debugging, leave stdout open, because that's where the resolver writes its
479 When we close stderr (which implies we've also closed stdout), we also get rid
480 of any controlling terminal.
492 tls_close(FALSE); /* Shut down the TLS library */
494 (void)close(fileno(smtp_in));
495 (void)close(fileno(smtp_out));
500 (void)close(0); /* stdin */
501 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
502 if (debug_selector == 0) /* stderr */
504 if (!synchronous_delivery)
517 /*************************************************
519 *************************************************/
521 /* This function sets a new uid and gid permanently, optionally calling
522 initgroups() to set auxiliary groups. There are some special cases when running
523 Exim in unprivileged modes. In these situations the effective uid will not be
524 root; if we already have the right effective uid/gid, and don't need to
525 initialize any groups, leave things as they are.
530 igflag TRUE if initgroups() wanted
531 msg text to use in debugging output and failure log
533 Returns: nothing; bombs out on failure
537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
539 uid_t euid = geteuid();
540 gid_t egid = getegid();
542 if (euid == root_uid || euid != uid || egid != gid || igflag)
544 /* At least one OS returns +1 for initgroups failure, so just check for
549 struct passwd *pw = getpwuid(uid);
552 if (initgroups(pw->pw_name, gid) != 0)
553 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
554 (long int)uid, strerror(errno));
556 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
557 "no passwd entry for uid=%ld", (long int)uid);
560 if (setgid(gid) < 0 || setuid(uid) < 0)
562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
563 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
567 /* Debugging output included uid/gid and all groups */
572 gid_t group_list[NGROUPS_MAX];
573 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
574 (long int)geteuid(), (long int)getegid(), (long int)getpid());
575 group_count = getgroups(NGROUPS_MAX, group_list);
576 debug_printf(" auxiliary group list:");
580 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
582 else debug_printf(" <none>");
590 /*************************************************
592 *************************************************/
594 /* Exim exits via this function so that it always clears up any open
600 Returns: does not return
608 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
609 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
616 /*************************************************
617 * Extract port from host address *
618 *************************************************/
620 /* Called to extract the port from the values given to -oMa and -oMi.
621 It also checks the syntax of the address, and terminates it before the
622 port data when a port is extracted.
625 address the address, with possible port on the end
627 Returns: the port, or zero if there isn't one
628 bombs out on a syntax error
632 check_port(uschar *address)
634 int port = host_address_extract_port(address);
635 if (string_is_ip_address(address, NULL) == 0)
637 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
645 /*************************************************
646 * Test/verify an address *
647 *************************************************/
649 /* This function is called by the -bv and -bt code. It extracts a working
650 address from a full RFC 822 address. This isn't really necessary per se, but it
651 has the effect of collapsing source routes.
655 flags flag bits for verify_address()
656 exit_value to be set for failures
662 test_address(uschar *s, int flags, int *exit_value)
664 int start, end, domain;
665 uschar *parse_error = NULL;
666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
670 fprintf(stdout, "syntax error: %s\n", parse_error);
675 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
676 -1, -1, NULL, NULL, NULL);
677 if (rc == FAIL) *exit_value = 2;
678 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
684 /*************************************************
685 * Decode bit settings for log/debug *
686 *************************************************/
688 /* This function decodes a string containing bit settings in the form of +name
689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
690 also recognizes a numeric setting of the form =<number>, but this is not
691 intended for user use. It's an easy way for Exim to pass the debug settings
692 when it is re-exec'ed.
694 The log options are held in two unsigned ints (because there became too many
695 for one). The top bit in the table means "put in 2nd selector". This does not
696 yet apply to debug options, so the "=" facility sets only the first selector.
698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
699 It sets all the bits in both selectors. However, there is a facility for then
700 unsetting certain bits, because we want to turn off "memory" in the debug case.
702 A bad value for a debug setting is treated as an unknown option - error message
703 to stderr and die. For log settings, which come from the configuration file,
704 we write to the log on the way out...
707 selector1 address of the first bit string
708 selector2 address of the second bit string, or NULL
709 notall1 bits to exclude from "all" for selector1
710 notall2 bits to exclude from "all" for selector2
711 string the configured string
712 options the table of option names
714 which "log" or "debug"
716 Returns: nothing on success - bomb out on failure
720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
721 int notall2, uschar *string, bit_table *options, int count, uschar *which)
724 if (string == NULL) return;
728 char *end; /* Not uschar */
729 *selector1 = strtoul(CS string+1, &end, 0);
730 if (*end == 0) return;
731 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
736 /* Handle symbolic setting */
743 bit_table *start, *end;
745 while (isspace(*string)) string++;
746 if (*string == 0) return;
748 if (*string != '+' && *string != '-')
750 errmsg = string_sprintf("malformed %s_selector setting: "
751 "+ or - expected but found \"%s\"", which, string);
755 adding = *string++ == '+';
757 while (isalnum(*string) || *string == '_') string++;
761 end = options + count;
765 bit_table *middle = start + (end - start)/2;
766 int c = Ustrncmp(s, middle->name, len);
769 if (middle->name[len] != 0) c = -1; else
771 unsigned int bit = middle->bit;
772 unsigned int *selector;
774 /* The value with all bits set means "force all bits in both selectors"
775 in the case where two are being handled. However, the top bit in the
776 second selector is never set. When setting, some bits can be excluded.
779 if (bit == 0xffffffff)
783 *selector1 = 0xffffffff ^ notall1;
784 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
789 if (selector2 != NULL) *selector2 = 0;
793 /* Otherwise, the 0x80000000 bit means "this value, without the top
794 bit, belongs in the second selector". */
798 if ((bit & 0x80000000) != 0)
800 selector = selector2;
803 else selector = selector1;
804 if (adding) *selector |= bit; else *selector &= ~bit;
806 break; /* Out of loop to match selector name */
809 if (c < 0) end = middle; else start = middle + 1;
810 } /* Loop to match selector name */
814 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
815 adding? '+' : '-', len, s);
818 } /* Loop for selector names */
820 /* Handle disasters */
823 if (Ustrcmp(which, "debug") == 0)
825 fprintf(stderr, "exim: %s\n", errmsg);
828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
833 /*************************************************
834 * Show supported features *
835 *************************************************/
837 /* This function is called for -bV and for -d to output the optional features
838 of the current Exim binary.
840 Arguments: a FILE for printing
845 show_whats_supported(FILE *f)
847 #ifdef DB_VERSION_STRING
848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
851 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
853 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
856 fprintf(f, "Probably ndbm\n");
857 #elif defined(USE_TDB)
858 fprintf(f, "Using tdb\n");
861 fprintf(f, "Probably GDBM (native mode)\n");
863 fprintf(f, "Probably GDBM (compatibility mode)\n");
867 fprintf(f, "Support for:");
868 #ifdef SUPPORT_CRYPTEQ
869 fprintf(f, " crypteq");
872 fprintf(f, " iconv()");
877 #ifdef HAVE_SETCLASSRESOURCES
878 fprintf(f, " use_setclassresources");
887 fprintf(f, " Expand_dlfunc");
889 #ifdef USE_TCP_WRAPPERS
890 fprintf(f, " TCPwrappers");
894 fprintf(f, " GnuTLS");
896 fprintf(f, " OpenSSL");
899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
900 fprintf(f, " translate_ip_address");
902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
903 fprintf(f, " move_frozen_messages");
905 #ifdef WITH_CONTENT_SCAN
906 fprintf(f, " Content_Scanning");
908 #ifdef WITH_OLD_DEMIME
909 fprintf(f, " Old_Demime");
911 #ifdef EXPERIMENTAL_SPF
912 fprintf(f, " Experimental_SPF");
914 #ifdef EXPERIMENTAL_SRS
915 fprintf(f, " Experimental_SRS");
917 #ifdef EXPERIMENTAL_BRIGHTMAIL
918 fprintf(f, " Experimental_Brightmail");
920 #ifdef EXPERIMENTAL_DOMAINKEYS
921 fprintf(f, " Experimental_DomainKeys");
925 fprintf(f, "Lookups:");
926 #ifdef LOOKUP_LSEARCH
927 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
933 fprintf(f, " dbm dbmnz");
936 fprintf(f, " dnsdb");
938 #ifdef LOOKUP_DSEARCH
939 fprintf(f, " dsearch");
942 fprintf(f, " ibase");
945 fprintf(f, " ldap ldapdn ldapm");
948 fprintf(f, " mysql");
951 fprintf(f, " nis nis0");
953 #ifdef LOOKUP_NISPLUS
954 fprintf(f, " nisplus");
957 fprintf(f, " oracle");
960 fprintf(f, " passwd");
963 fprintf(f, " pgsql");
966 fprintf(f, " sqlite");
969 fprintf(f, " testdb");
972 fprintf(f, " whoson");
976 fprintf(f, "Authenticators:");
978 fprintf(f, " cram_md5");
980 #ifdef AUTH_CYRUS_SASL
981 fprintf(f, " cyrus_sasl");
984 fprintf(f, " dovecot");
986 #ifdef AUTH_PLAINTEXT
987 fprintf(f, " plaintext");
994 fprintf(f, "Routers:");
996 fprintf(f, " accept");
998 #ifdef ROUTER_DNSLOOKUP
999 fprintf(f, " dnslookup");
1001 #ifdef ROUTER_IPLITERAL
1002 fprintf(f, " ipliteral");
1004 #ifdef ROUTER_IPLOOKUP
1005 fprintf(f, " iplookup");
1007 #ifdef ROUTER_MANUALROUTE
1008 fprintf(f, " manualroute");
1010 #ifdef ROUTER_QUERYPROGRAM
1011 fprintf(f, " queryprogram");
1013 #ifdef ROUTER_REDIRECT
1014 fprintf(f, " redirect");
1018 fprintf(f, "Transports:");
1019 #ifdef TRANSPORT_APPENDFILE
1020 fprintf(f, " appendfile");
1021 #ifdef SUPPORT_MAILDIR
1022 fprintf(f, "/maildir");
1024 #ifdef SUPPORT_MAILSTORE
1025 fprintf(f, "/mailstore");
1031 #ifdef TRANSPORT_AUTOREPLY
1032 fprintf(f, " autoreply");
1034 #ifdef TRANSPORT_LMTP
1035 fprintf(f, " lmtp");
1037 #ifdef TRANSPORT_PIPE
1038 fprintf(f, " pipe");
1040 #ifdef TRANSPORT_SMTP
1041 fprintf(f, " smtp");
1045 if (fixed_never_users[0] > 0)
1048 fprintf(f, "Fixed never_users: ");
1049 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1050 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1051 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1054 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1060 /*************************************************
1061 * Quote a local part *
1062 *************************************************/
1064 /* This function is used when a sender address or a From: or Sender: header
1065 line is being created from the caller's login, or from an authenticated_id. It
1066 applies appropriate quoting rules for a local part.
1068 Argument: the local part
1069 Returns: the local part, quoted if necessary
1073 local_part_quote(uschar *lpart)
1075 BOOL needs_quote = FALSE;
1080 for (t = lpart; !needs_quote && *t != 0; t++)
1082 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1083 (*t != '.' || t == lpart || t[1] == 0);
1086 if (!needs_quote) return lpart;
1089 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1093 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1096 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1099 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1100 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1101 yield = string_cat(yield, &size, &ptr, nq, 1);
1105 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1113 /*************************************************
1114 * Load readline() functions *
1115 *************************************************/
1117 /* This function is called from testing executions that read data from stdin,
1118 but only when running as the calling user. Currently, only -be does this. The
1119 function loads the readline() function library and passes back the functions.
1120 On some systems, it needs the curses library, so load that too, but try without
1121 it if loading fails. All this functionality has to be requested at build time.
1124 fn_readline_ptr pointer to where to put the readline pointer
1125 fn_addhist_ptr pointer to where to put the addhistory function
1127 Returns: the dlopen handle or NULL on failure
1131 set_readline(char * (**fn_readline_ptr)(char *),
1132 char * (**fn_addhist_ptr)(char *))
1135 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1137 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1138 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1140 if (dlhandle != NULL)
1142 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1143 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1147 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1156 /*************************************************
1157 * Get a line from stdin for testing things *
1158 *************************************************/
1160 /* This function is called when running tests that can take a number of lines
1161 of input (for example, -be and -bt). It handles continuations and trailing
1162 spaces. And prompting and a blank line output on eof. If readline() is in use,
1163 the arguments are non-NULL and provide the relevant functions.
1166 fn_readline readline function or NULL
1167 fn_addhist addhist function or NULL
1169 Returns: pointer to dynamic memory, or NULL at end of file
1173 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1178 uschar *yield = NULL;
1180 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1184 uschar buffer[1024];
1188 char *readline_line = NULL;
1189 if (fn_readline != NULL)
1191 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1192 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1193 p = US readline_line;
1198 /* readline() not in use */
1201 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1205 /* Handle the line */
1207 ss = p + (int)Ustrlen(p);
1208 while (ss > p && isspace(ss[-1])) ss--;
1212 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1215 yield = string_cat(yield, &size, &ptr, p, ss - p);
1218 if (fn_readline != NULL) free(readline_line);
1221 if (ss == p || yield[ptr-1] != '\\')
1229 if (yield == NULL) printf("\n");
1235 /*************************************************
1236 * Entry point and high-level code *
1237 *************************************************/
1239 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1240 the appropriate action. All the necessary functions are present in the one
1241 binary. I originally thought one should split it up, but it turns out that so
1242 much of the apparatus is needed in each chunk that one might as well just have
1243 it all available all the time, which then makes the coding easier as well.
1246 argc count of entries in argv
1247 argv argument strings, with argv[0] being the program name
1249 Returns: EXIT_SUCCESS if terminated successfully
1250 EXIT_FAILURE otherwise, except when a message has been sent
1251 to the sender, and -oee was given
1255 main(int argc, char **cargv)
1257 uschar **argv = USS cargv;
1258 int arg_receive_timeout = -1;
1259 int arg_smtp_receive_timeout = -1;
1260 int arg_error_handling = error_handling;
1261 int filter_sfd = -1;
1262 int filter_ufd = -1;
1265 int list_queue_option = 0;
1267 int msg_action_arg = -1;
1268 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1269 int queue_only_reason = 0;
1271 int perl_start_option = 0;
1273 int recipients_arg = argc;
1274 int sender_address_domain = 0;
1275 int test_retry_arg = -1;
1276 int test_rewrite_arg = -1;
1277 BOOL arg_queue_only = FALSE;
1278 BOOL bi_option = FALSE;
1279 BOOL checking = FALSE;
1280 BOOL count_queue = FALSE;
1281 BOOL expansion_test = FALSE;
1282 BOOL extract_recipients = FALSE;
1283 BOOL forced_delivery = FALSE;
1284 BOOL f_end_dot = FALSE;
1285 BOOL deliver_give_up = FALSE;
1286 BOOL list_queue = FALSE;
1287 BOOL list_options = FALSE;
1288 BOOL local_queue_only;
1290 BOOL one_msg_action = FALSE;
1291 BOOL queue_only_set = FALSE;
1292 BOOL receiving_message = TRUE;
1293 BOOL sender_ident_set = FALSE;
1295 BOOL removed_privilege = FALSE;
1296 BOOL verify_address_mode = FALSE;
1297 BOOL verify_as_sender = FALSE;
1298 BOOL version_printed = FALSE;
1299 uschar *alias_arg = NULL;
1300 uschar *called_as = US"";
1301 uschar *start_queue_run_id = NULL;
1302 uschar *stop_queue_run_id = NULL;
1303 uschar *expansion_test_message = NULL;
1304 uschar *ftest_domain = NULL;
1305 uschar *ftest_localpart = NULL;
1306 uschar *ftest_prefix = NULL;
1307 uschar *ftest_suffix = NULL;
1308 uschar *real_sender_address;
1309 uschar *originator_home = US"/";
1313 struct stat statbuf;
1314 pid_t passed_qr_pid = (pid_t)0;
1315 int passed_qr_pipe = -1;
1316 gid_t group_list[NGROUPS_MAX];
1318 /* Possible options for -R and -S */
1320 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1322 /* Need to define this in case we need to change the environment in order
1323 to get rid of a bogus time zone. We have to make it char rather than uschar
1324 because some OS define it in /usr/include/unistd.h. */
1326 extern char **environ;
1328 /* If the Exim user and/or group and/or the configuration file owner/group were
1329 defined by ref:name at build time, we must now find the actual uid/gid values.
1330 This is a feature to make the lives of binary distributors easier. */
1332 #ifdef EXIM_USERNAME
1333 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1335 exim_gid = pw->pw_gid;
1339 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1345 #ifdef EXIM_GROUPNAME
1346 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1348 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1354 #ifdef CONFIGURE_OWNERNAME
1355 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1357 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1358 CONFIGURE_OWNERNAME);
1363 #ifdef CONFIGURE_GROUPNAME
1364 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1366 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1367 CONFIGURE_GROUPNAME);
1372 /* In the Cygwin environment, some initialization needs doing. It is fudged
1373 in by means of this macro. */
1379 /* Check a field which is patched when we are running Exim within its
1380 testing harness; do a fast initial check, and then the whole thing. */
1382 running_in_test_harness =
1383 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1385 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1386 at the start of a program; however, it seems that some environments do not
1387 follow this. A "strange" locale can affect the formatting of timestamps, so we
1390 setlocale(LC_ALL, "C");
1392 /* Set up the default handler for timing using alarm(). */
1394 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1396 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1397 because store_malloc writes a log entry on failure. */
1399 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1400 if (log_buffer == NULL)
1402 fprintf(stderr, "exim: failed to get store for log buffer\n");
1406 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1407 NULL when the daemon is run and the file is closed. We have to use this
1408 indirection, because some systems don't allow writing to the variable "stderr".
1411 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1413 /* Arrange for the PCRE regex library to use our store functions. Note that
1414 the normal calls are actually macros that add additional arguments for
1415 debugging purposes so we have to assign specially constructed functions here.
1416 The default is to use store in the stacking pool, but this is overridden in the
1417 regex_must_compile() function. */
1419 pcre_malloc = function_store_get;
1420 pcre_free = function_dummy_free;
1422 /* Ensure there is a big buffer for temporary use in several places. It is put
1423 in malloc store so that it can be freed for enlargement if necessary. */
1425 big_buffer = store_malloc(big_buffer_size);
1427 /* Set up the handler for the data request signal, and set the initial
1428 descriptive text. */
1430 set_process_info("initializing");
1431 os_restarting_signal(SIGUSR1, usr1_handler);
1433 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1434 in the daemon code. For the rest of Exim's uses, we ignore it. */
1436 signal(SIGHUP, SIG_IGN);
1438 /* We don't want to die on pipe errors as the code is written to handle
1439 the write error instead. */
1441 signal(SIGPIPE, SIG_IGN);
1443 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1444 set to SIG_IGN. This causes subprocesses that complete before the parent
1445 process waits for them not to hang around, so when Exim calls wait(), nothing
1446 is there. The wait() code has been made robust against this, but let's ensure
1447 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1448 ending status. We use sigaction rather than plain signal() on those OS where
1449 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1450 problem on AIX with this.) */
1454 struct sigaction act;
1455 act.sa_handler = SIG_DFL;
1456 sigemptyset(&(act.sa_mask));
1458 sigaction(SIGCHLD, &act, NULL);
1461 signal(SIGCHLD, SIG_DFL);
1464 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1469 /* Set up the version number. Set up the leading 'E' for the external form of
1470 message ids, set the pointer to the internal form, and initialize it to
1471 indicate no message being processed. */
1474 message_id_option[0] = '-';
1475 message_id_external = message_id_option + 1;
1476 message_id_external[0] = 'E';
1477 message_id = message_id_external + 1;
1480 /* Set the umask to zero so that any files Exim creates using open() are
1481 created with the modes that it specifies. NOTE: Files created with fopen() have
1482 a problem, which was not recognized till rather late (February 2006). With this
1483 umask, such files will be world writeable. (They are all content scanning files
1484 in the spool directory, which isn't world-accessible, so this is not a
1485 disaster, but it's untidy.) I don't want to change this overall setting,
1486 however, because it will interact badly with the open() calls. Instead, there's
1487 now a function called modefopen() that fiddles with the umask while calling
1492 /* Precompile the regular expression for matching a message id. Keep this in
1493 step with the code that generates ids in the accept.c module. We need to do
1494 this here, because the -M options check their arguments for syntactic validity
1495 using mac_ismsgid, which uses this. */
1498 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1500 /* Precompile the regular expression that is used for matching an SMTP error
1501 code, possibly extended, at the start of an error message. Note that the
1502 terminating whitespace character is included. */
1505 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1508 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1509 this seems to be a generally accepted convention, since one finds symbolic
1510 links called "mailq" in standard OS configurations. */
1512 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1513 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1516 receiving_message = FALSE;
1517 called_as = US"-mailq";
1520 /* If the program is called as "rmail" treat it as equivalent to
1521 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1522 i.e. preventing a single dot on a line from terminating the message, and
1523 returning with zero return code, even in cases of error (provided an error
1524 message has been sent). */
1526 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1527 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1530 called_as = US"-rmail";
1531 errors_sender_rc = EXIT_SUCCESS;
1534 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1535 this is a smail convention. */
1537 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1538 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1540 smtp_input = smtp_batched_input = TRUE;
1541 called_as = US"-rsmtp";
1544 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1545 this is a smail convention. */
1547 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1548 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1551 receiving_message = FALSE;
1552 called_as = US"-runq";
1555 /* If the program is called as "newaliases" treat it as equivalent to
1556 "exim -bi"; this is a sendmail convention. */
1558 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1559 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1562 receiving_message = FALSE;
1563 called_as = US"-newaliases";
1566 /* Save the original effective uid for a couple of uses later. It should
1567 normally be root, but in some esoteric environments it may not be. */
1569 original_euid = geteuid();
1571 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1572 to be the same as the real ones. This makes a difference only if Exim is setuid
1573 (or setgid) to something other than root, which could be the case in some
1574 special configurations. */
1576 real_uid = getuid();
1577 real_gid = getgid();
1579 if (real_uid == root_uid)
1585 /* If neither the original real uid nor the original euid was root, Exim is
1586 running in an unprivileged state. */
1588 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1590 /* If the first argument is --help, pretend there are no arguments. This will
1591 cause a brief message to be given. */
1593 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1595 /* Scan the program's arguments. Some can be dealt with right away; others are
1596 simply recorded for checking and handling afterwards. Do a high-level switch
1597 on the second character (the one after '-'), to save some effort. */
1599 for (i = 1; i < argc; i++)
1601 BOOL badarg = FALSE;
1602 uschar *arg = argv[i];
1606 /* An argument not starting with '-' is the start of a recipients list;
1607 break out of the options-scanning loop. */
1615 /* An option consistion of -- terminates the options */
1617 if (Ustrcmp(arg, "--") == 0)
1619 recipients_arg = i + 1;
1623 /* Handle flagged options */
1625 switchchar = arg[1];
1628 /* Make all -ex options synonymous with -oex arguments, since that
1629 is assumed by various callers. Also make -qR options synonymous with -R
1630 options, as that seems to be required as well. Allow for -qqR too, and
1631 the same for -S options. */
1633 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1634 Ustrncmp(arg+1, "qR", 2) == 0 ||
1635 Ustrncmp(arg+1, "qS", 2) == 0)
1637 switchchar = arg[2];
1640 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1642 switchchar = arg[3];
1644 queue_2stage = TRUE;
1647 /* Make -r synonymous with -f, since it is a documented alias */
1649 else if (arg[1] == 'r') switchchar = 'f';
1651 /* Make -ov synonymous with -v */
1653 else if (Ustrcmp(arg, "-ov") == 0)
1659 /* High-level switch on active initial letter */
1663 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1664 so has no need of it. */
1667 if (*argrest == 0) i++; /* Skip over the type */
1672 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1674 /* -bd: Run in daemon mode, awaiting SMTP connections.
1675 -bdf: Ditto, but in the foreground.
1678 if (*argrest == 'd')
1680 daemon_listen = TRUE;
1681 if (*(++argrest) == 'f') background_daemon = FALSE;
1682 else if (*argrest != 0) { badarg = TRUE; break; }
1685 /* -be: Run in expansion test mode
1686 -bem: Ditto, but read a message from a file first
1689 else if (*argrest == 'e')
1691 expansion_test = checking = TRUE;
1692 if (argrest[1] == 'm')
1694 if (++i >= argc) { badarg = TRUE; break; }
1695 expansion_test_message = argv[i];
1698 if (argrest[1] != 0) { badarg = TRUE; break; }
1701 /* -bF: Run system filter test */
1703 else if (*argrest == 'F')
1705 filter_test |= FTEST_SYSTEM;
1706 if (*(++argrest) != 0) { badarg = TRUE; break; }
1707 if (++i < argc) filter_test_sfile = argv[i]; else
1709 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1714 /* -bf: Run user filter test
1715 -bfd: Set domain for filter testing
1716 -bfl: Set local part for filter testing
1717 -bfp: Set prefix for filter testing
1718 -bfs: Set suffix for filter testing
1721 else if (*argrest == 'f')
1723 if (*(++argrest) == 0)
1725 filter_test |= FTEST_USER;
1726 if (++i < argc) filter_test_ufile = argv[i]; else
1728 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1736 fprintf(stderr, "exim: string expected after %s\n", arg);
1739 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1740 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1741 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1742 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1743 else { badarg = TRUE; break; }
1747 /* -bh: Host checking - an IP address must follow. */
1749 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1751 if (++i >= argc) { badarg = TRUE; break; }
1752 sender_host_address = argv[i];
1753 host_checking = checking = log_testing_mode = TRUE;
1754 host_checking_callout = argrest[1] == 'c';
1757 /* -bi: This option is used by sendmail to initialize *the* alias file,
1758 though it has the -oA option to specify a different file. Exim has no
1759 concept of *the* alias file, but since Sun's YP make script calls
1760 sendmail this way, some support must be provided. */
1762 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1764 /* -bm: Accept and deliver message - the default option. Reinstate
1765 receiving_message, which got turned off for all -b options. */
1767 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1769 /* -bnq: For locally originating messages, do not qualify unqualified
1770 addresses. In the envelope, this causes errors; in header lines they
1773 else if (Ustrcmp(argrest, "nq") == 0)
1775 allow_unqualified_sender = FALSE;
1776 allow_unqualified_recipient = FALSE;
1779 /* -bpxx: List the contents of the mail queue, in various forms. If
1780 the option is -bpc, just a queue count is needed. Otherwise, if the
1781 first letter after p is r, then order is random. */
1783 else if (*argrest == 'p')
1785 if (*(++argrest) == 'c')
1788 if (*(++argrest) != 0) badarg = TRUE;
1792 if (*argrest == 'r')
1794 list_queue_option = 8;
1797 else list_queue_option = 0;
1801 /* -bp: List the contents of the mail queue, top-level only */
1803 if (*argrest == 0) {}
1805 /* -bpu: List the contents of the mail queue, top-level undelivered */
1807 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1809 /* -bpa: List the contents of the mail queue, including all delivered */
1811 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1813 /* Unknown after -bp[r] */
1823 /* -bP: List the configuration variables given as the address list.
1824 Force -v, so configuration errors get displayed. */
1826 else if (Ustrcmp(argrest, "P") == 0)
1828 list_options = TRUE;
1829 debug_selector |= D_v;
1830 debug_file = stderr;
1833 /* -brt: Test retry configuration lookup */
1835 else if (Ustrcmp(argrest, "rt") == 0)
1837 test_retry_arg = i + 1;
1841 /* -brw: Test rewrite configuration */
1843 else if (Ustrcmp(argrest, "rw") == 0)
1845 test_rewrite_arg = i + 1;
1849 /* -bS: Read SMTP commands on standard input, but produce no replies -
1850 all errors are reported by sending messages. */
1852 else if (Ustrcmp(argrest, "S") == 0)
1853 smtp_input = smtp_batched_input = receiving_message = TRUE;
1855 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1856 on standard output. */
1858 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1860 /* -bt: address testing mode */
1862 else if (Ustrcmp(argrest, "t") == 0)
1863 address_test_mode = checking = log_testing_mode = TRUE;
1865 /* -bv: verify addresses */
1867 else if (Ustrcmp(argrest, "v") == 0)
1868 verify_address_mode = checking = log_testing_mode = TRUE;
1870 /* -bvs: verify sender addresses */
1872 else if (Ustrcmp(argrest, "vs") == 0)
1874 verify_address_mode = checking = log_testing_mode = TRUE;
1875 verify_as_sender = TRUE;
1878 /* -bV: Print version string and support details */
1880 else if (Ustrcmp(argrest, "V") == 0)
1882 printf("Exim version %s #%s built %s\n", version_string,
1883 version_cnumber, version_date);
1884 printf("%s\n", CS version_copyright);
1885 version_printed = TRUE;
1886 show_whats_supported(stdout);
1893 /* -C: change configuration file list; ignore if it isn't really
1894 a change! Enforce a prefix check if required. */
1899 if(++i < argc) argrest = argv[i]; else
1900 { badarg = TRUE; break; }
1902 if (Ustrcmp(config_main_filelist, argrest) != 0)
1904 #ifdef ALT_CONFIG_PREFIX
1906 int len = Ustrlen(ALT_CONFIG_PREFIX);
1907 uschar *list = argrest;
1909 while((filename = string_nextinlist(&list, &sep, big_buffer,
1910 big_buffer_size)) != NULL)
1912 if ((Ustrlen(filename) < len ||
1913 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1914 Ustrstr(filename, "/../") != NULL) &&
1915 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1917 fprintf(stderr, "-C Permission denied\n");
1923 config_main_filelist = argrest;
1924 config_changed = TRUE;
1929 /* -D: set up a macro definition */
1932 #ifdef DISABLE_D_OPTION
1933 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1938 macro_item *mlast = NULL;
1941 uschar *s = argrest;
1943 while (isspace(*s)) s++;
1945 if (*s < 'A' || *s > 'Z')
1947 fprintf(stderr, "exim: macro name set by -D must start with "
1948 "an upper case letter\n");
1952 while (isalnum(*s) || *s == '_')
1954 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1958 if (ptr == 0) { badarg = TRUE; break; }
1959 while (isspace(*s)) s++;
1962 if (*s++ != '=') { badarg = TRUE; break; }
1963 while (isspace(*s)) s++;
1966 for (m = macros; m != NULL; m = m->next)
1968 if (Ustrcmp(m->name, name) == 0)
1970 fprintf(stderr, "exim: duplicated -D in command line\n");
1976 m = store_get(sizeof(macro_item) + Ustrlen(name));
1978 m->command_line = TRUE;
1979 if (mlast == NULL) macros = m; else mlast->next = m;
1980 Ustrcpy(m->name, name);
1981 m->replacement = string_copy(s);
1983 if (clmacro_count >= MAX_CLMACROS)
1985 fprintf(stderr, "exim: too many -D options on command line\n");
1988 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1994 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1995 The latter is now a no-op, retained for compatibility only. If -dd is used,
1996 debugging subprocesses of the daemon is disabled. */
1999 if (Ustrcmp(argrest, "ropcr") == 0)
2001 /* drop_cr = TRUE; */
2004 /* Use an intermediate variable so that we don't set debugging while
2005 decoding the debugging bits. */
2009 unsigned int selector = D_default;
2012 if (*argrest == 'd')
2014 debug_daemon = TRUE;
2018 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2019 debug_options_count, US"debug");
2020 debug_selector = selector;
2025 /* -E: This is a local error message. This option is not intended for
2026 external use at all, but is not restricted to trusted callers because it
2027 does no harm (just suppresses certain error messages) and if Exim is run
2028 not setuid root it won't always be trusted when it generates error
2029 messages using this option. If there is a message id following -E, point
2030 message_reference at it, for logging. */
2033 local_error_message = TRUE;
2034 if (mac_ismsgid(argrest)) message_reference = argrest;
2038 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2039 option, so it looks as if historically the -oex options are also callable
2040 without the leading -o. So we have to accept them. Before the switch,
2041 anything starting -oe has been converted to -e. Exim does not support all
2042 of the sendmail error options. */
2045 if (Ustrcmp(argrest, "e") == 0)
2047 arg_error_handling = ERRORS_SENDER;
2048 errors_sender_rc = EXIT_SUCCESS;
2050 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2051 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2052 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2053 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2058 /* -F: Set sender's full name, used instead of the gecos entry from
2059 the password file. Since users can usually alter their gecos entries,
2060 there's no security involved in using this instead. The data can follow
2061 the -F or be in the next argument. */
2066 if(++i < argc) argrest = argv[i]; else
2067 { badarg = TRUE; break; }
2069 originator_name = argrest;
2070 sender_name_forced = TRUE;
2074 /* -f: Set sender's address - this value is only actually used if Exim is
2075 run by a trusted user, or if untrusted_set_sender is set and matches the
2076 address, except that the null address can always be set by any user. The
2077 test for this happens later, when the value given here is ignored when not
2078 permitted. For an untrusted user, the actual sender is still put in Sender:
2079 if it doesn't match the From: header (unless no_local_from_check is set).
2080 The data can follow the -f or be in the next argument. The -r switch is an
2081 obsolete form of -f but since there appear to be programs out there that
2082 use anything that sendmail has ever supported, better accept it - the
2083 synonymizing is done before the switch above.
2085 At this stage, we must allow domain literal addresses, because we don't
2086 know what the setting of allow_domain_literals is yet. Ditto for trailing
2087 dots and strip_trailing_dot. */
2095 if (i+1 < argc) argrest = argv[++i]; else
2096 { badarg = TRUE; break; }
2100 sender_address = string_sprintf(""); /* Ensure writeable memory */
2104 uschar *temp = argrest + Ustrlen(argrest) - 1;
2105 while (temp >= argrest && isspace(*temp)) temp--;
2106 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2107 allow_domain_literals = TRUE;
2108 strip_trailing_dot = TRUE;
2109 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2110 &sender_address_domain, TRUE);
2111 allow_domain_literals = FALSE;
2112 strip_trailing_dot = FALSE;
2113 if (sender_address == NULL)
2115 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2116 return EXIT_FAILURE;
2119 sender_address_forced = TRUE;
2123 /* This is some Sendmail thing which can be ignored */
2128 /* -h: Set the hop count for an incoming message. Exim does not currently
2129 support this; it always computes it by counting the Received: headers.
2130 To put it in will require a change to the spool header file format. */
2135 if(++i < argc) argrest = argv[i]; else
2136 { badarg = TRUE; break; }
2138 if (!isdigit(*argrest)) badarg = TRUE;
2142 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2143 not to be documented for sendmail but mailx (at least) uses it) */
2146 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2151 receiving_message = FALSE;
2153 /* -MC: continue delivery of another message via an existing open
2154 file descriptor. This option is used for an internal call by the
2155 smtp transport when there is a pending message waiting to go to an
2156 address to which it has got a connection. Five subsequent arguments are
2157 required: transport name, host name, IP address, sequence number, and
2158 message_id. Transports may decline to create new processes if the sequence
2159 number gets too big. The channel is stdin. This (-MC) must be the last
2160 argument. There's a subsequent check that the real-uid is privileged.
2162 If we are running in the test harness. delay for a bit, to let the process
2163 that set this one up complete. This makes for repeatability of the logging,
2166 if (Ustrcmp(argrest, "C") == 0)
2168 union sockaddr_46 interface_sock;
2169 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2173 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2174 return EXIT_FAILURE;
2177 if (msg_action_arg >= 0)
2179 fprintf(stderr, "exim: incompatible arguments\n");
2180 return EXIT_FAILURE;
2183 continue_transport = argv[++i];
2184 continue_hostname = argv[++i];
2185 continue_host_address = argv[++i];
2186 continue_sequence = Uatoi(argv[++i]);
2187 msg_action = MSG_DELIVER;
2188 msg_action_arg = ++i;
2189 forced_delivery = TRUE;
2190 queue_run_pid = passed_qr_pid;
2191 queue_run_pipe = passed_qr_pipe;
2193 if (!mac_ismsgid(argv[i]))
2195 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2197 return EXIT_FAILURE;
2200 /* Set up $sending_ip_address and $sending_port */
2202 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2204 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2208 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2210 return EXIT_FAILURE;
2213 if (running_in_test_harness) millisleep(500);
2217 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2218 precedes -MC (see above). The flag indicates that the host to which
2219 Exim is connected has accepted an AUTH sequence. */
2221 else if (Ustrcmp(argrest, "CA") == 0)
2223 smtp_authenticated = TRUE;
2227 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2228 it preceded -MC (see above) */
2230 else if (Ustrcmp(argrest, "CP") == 0)
2232 smtp_use_pipelining = TRUE;
2236 /* -MCQ: pass on the pid of the queue-running process that started
2237 this chain of deliveries and the fd of its synchronizing pipe; this
2238 is useful only when it precedes -MC (see above) */
2240 else if (Ustrcmp(argrest, "CQ") == 0)
2242 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2244 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2249 /* -MCS: set the smtp_use_size flag; this is useful only when it
2250 precedes -MC (see above) */
2252 else if (Ustrcmp(argrest, "CS") == 0)
2254 smtp_use_size = TRUE;
2258 /* -MCT: set the tls_offered flag; this is useful only when it
2259 precedes -MC (see above). The flag indicates that the host to which
2260 Exim is connected has offered TLS support. */
2263 else if (Ustrcmp(argrest, "CT") == 0)
2270 /* -M[x]: various operations on the following list of message ids:
2271 -M deliver the messages, ignoring next retry times and thawing
2272 -Mc deliver the messages, checking next retry times, no thawing
2273 -Mf freeze the messages
2274 -Mg give up on the messages
2275 -Mt thaw the messages
2276 -Mrm remove the messages
2277 In the above cases, this must be the last option. There are also the
2278 following options which are followed by a single message id, and which
2279 act on that message. Some of them use the "recipient" addresses as well.
2280 -Mar add recipient(s)
2281 -Mmad mark all recipients delivered
2282 -Mmd mark recipients(s) delivered
2284 -Mset load a message for use with -be
2286 -Mvc show copy (of whole message, in RFC 2822 format)
2291 else if (*argrest == 0)
2293 msg_action = MSG_DELIVER;
2294 forced_delivery = deliver_force_thaw = TRUE;
2296 else if (Ustrcmp(argrest, "ar") == 0)
2298 msg_action = MSG_ADD_RECIPIENT;
2299 one_msg_action = TRUE;
2301 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2302 else if (Ustrcmp(argrest, "es") == 0)
2304 msg_action = MSG_EDIT_SENDER;
2305 one_msg_action = TRUE;
2307 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2308 else if (Ustrcmp(argrest, "g") == 0)
2310 msg_action = MSG_DELIVER;
2311 deliver_give_up = TRUE;
2313 else if (Ustrcmp(argrest, "mad") == 0)
2315 msg_action = MSG_MARK_ALL_DELIVERED;
2317 else if (Ustrcmp(argrest, "md") == 0)
2319 msg_action = MSG_MARK_DELIVERED;
2320 one_msg_action = TRUE;
2322 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2323 else if (Ustrcmp(argrest, "set") == 0)
2325 msg_action = MSG_LOAD;
2326 one_msg_action = TRUE;
2328 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2329 else if (Ustrcmp(argrest, "vb") == 0)
2331 msg_action = MSG_SHOW_BODY;
2332 one_msg_action = TRUE;
2334 else if (Ustrcmp(argrest, "vc") == 0)
2336 msg_action = MSG_SHOW_COPY;
2337 one_msg_action = TRUE;
2339 else if (Ustrcmp(argrest, "vh") == 0)
2341 msg_action = MSG_SHOW_HEADER;
2342 one_msg_action = TRUE;
2344 else if (Ustrcmp(argrest, "vl") == 0)
2346 msg_action = MSG_SHOW_LOG;
2347 one_msg_action = TRUE;
2349 else { badarg = TRUE; break; }
2351 /* All the -Mxx options require at least one message id. */
2353 msg_action_arg = i + 1;
2354 if (msg_action_arg >= argc)
2356 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2357 return EXIT_FAILURE;
2360 /* Some require only message ids to follow */
2362 if (!one_msg_action)
2365 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2367 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2369 return EXIT_FAILURE;
2371 goto END_ARG; /* Remaining args are ids */
2374 /* Others require only one message id, possibly followed by addresses,
2375 which will be handled as normal arguments. */
2379 if (!mac_ismsgid(argv[msg_action_arg]))
2381 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2382 argv[msg_action_arg], arg);
2383 return EXIT_FAILURE;
2390 /* Some programs seem to call the -om option without the leading o;
2391 for sendmail it askes for "me too". Exim always does this. */
2394 if (*argrest != 0) badarg = TRUE;
2398 /* -N: don't do delivery - a debugging option that stops transports doing
2399 their thing. It implies debugging at the D_v level. */
2404 dont_deliver = TRUE;
2405 debug_selector |= D_v;
2406 debug_file = stderr;
2412 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2418 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2419 option to the specified value. This form uses long names. We need to handle
2420 -O option=value and -Ooption=value. */
2427 fprintf(stderr, "exim: string expected after -O\n");
2435 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2438 if (*argrest == 'A')
2440 alias_arg = argrest + 1;
2441 if (alias_arg[0] == 0)
2443 if (i+1 < argc) alias_arg = argv[++i]; else
2445 fprintf(stderr, "exim: string expected after -oA\n");
2451 /* -oB: Set a connection message max value for remote deliveries */
2453 else if (*argrest == 'B')
2455 uschar *p = argrest + 1;
2458 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2460 connection_max_messages = 1;
2469 fprintf(stderr, "exim: number expected after -oB\n");
2472 connection_max_messages = Uatoi(p);
2476 /* -odb: background delivery */
2478 else if (Ustrcmp(argrest, "db") == 0)
2480 synchronous_delivery = FALSE;
2481 arg_queue_only = FALSE;
2482 queue_only_set = TRUE;
2485 /* -odf: foreground delivery (smail-compatible option); same effect as
2486 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2489 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2491 synchronous_delivery = TRUE;
2492 arg_queue_only = FALSE;
2493 queue_only_set = TRUE;
2496 /* -odq: queue only */
2498 else if (Ustrcmp(argrest, "dq") == 0)
2500 synchronous_delivery = FALSE;
2501 arg_queue_only = TRUE;
2502 queue_only_set = TRUE;
2505 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2506 but no remote delivery */
2508 else if (Ustrcmp(argrest, "dqs") == 0)
2511 arg_queue_only = FALSE;
2512 queue_only_set = TRUE;
2515 /* -oex: Sendmail error flags. As these are also accepted without the
2516 leading -o prefix, for compatibility with vacation and other callers,
2517 they are handled with -e above. */
2519 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2520 -oitrue: Another sendmail syntax for the same */
2522 else if (Ustrcmp(argrest, "i") == 0 ||
2523 Ustrcmp(argrest, "itrue") == 0)
2526 /* -oM*: Set various characteristics for an incoming message; actually
2527 acted on for trusted callers only. */
2529 else if (*argrest == 'M')
2533 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2537 /* -oMa: Set sender host address */
2539 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2541 /* -oMaa: Set authenticator name */
2543 else if (Ustrcmp(argrest, "Maa") == 0)
2544 sender_host_authenticated = argv[++i];
2546 /* -oMas: setting authenticated sender */
2548 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2550 /* -oMai: setting authenticated id */
2552 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2554 /* -oMi: Set incoming interface address */
2556 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2558 /* -oMr: Received protocol */
2560 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2562 /* -oMs: Set sender host name */
2564 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2566 /* -oMt: Set sender ident */
2568 else if (Ustrcmp(argrest, "Mt") == 0)
2570 sender_ident_set = TRUE;
2571 sender_ident = argv[++i];
2574 /* Else a bad argument */
2583 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2584 seem to call this as -m (undocumented), so that is also accepted (see
2587 else if (Ustrcmp(argrest, "m") == 0) {}
2589 /* -oo: An ancient flag for old-style addresses which still seems to
2590 crop up in some calls (see in SCO). */
2592 else if (Ustrcmp(argrest, "o") == 0) {}
2594 /* -oP <name>: set pid file path for daemon */
2596 else if (Ustrcmp(argrest, "P") == 0)
2597 override_pid_file_path = argv[++i];
2599 /* -or <n>: set timeout for non-SMTP acceptance
2600 -os <n>: set timeout for SMTP acceptance */
2602 else if (*argrest == 'r' || *argrest == 's')
2604 int *tp = (*argrest == 'r')?
2605 &arg_receive_timeout : &arg_smtp_receive_timeout;
2606 if (argrest[1] == 0)
2608 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2610 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2613 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2618 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2620 else if (Ustrcmp(argrest, "X") == 0)
2621 override_local_interfaces = argv[++i];
2623 /* Unknown -o argument */
2629 /* -ps: force Perl startup; -pd force delayed Perl startup */
2633 if (*argrest == 's' && argrest[1] == 0)
2635 perl_start_option = 1;
2638 if (*argrest == 'd' && argrest[1] == 0)
2640 perl_start_option = -1;
2645 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2646 which sets the host protocol and host name */
2650 if (i+1 < argc) argrest = argv[++i]; else
2651 { badarg = TRUE; break; }
2656 uschar *hn = Ustrchr(argrest, ':');
2659 received_protocol = argrest;
2663 received_protocol = string_copyn(argrest, hn - argrest);
2664 sender_host_name = hn + 1;
2671 receiving_message = FALSE;
2672 if (queue_interval >= 0)
2674 fprintf(stderr, "exim: -q specified more than once\n");
2678 /* -qq...: Do queue runs in a 2-stage manner */
2680 if (*argrest == 'q')
2682 queue_2stage = TRUE;
2686 /* -qi...: Do only first (initial) deliveries */
2688 if (*argrest == 'i')
2690 queue_run_first_delivery = TRUE;
2694 /* -qf...: Run the queue, forcing deliveries
2695 -qff..: Ditto, forcing thawing as well */
2697 if (*argrest == 'f')
2699 queue_run_force = TRUE;
2700 if (*(++argrest) == 'f')
2702 deliver_force_thaw = TRUE;
2707 /* -q[f][f]l...: Run the queue only on local deliveries */
2709 if (*argrest == 'l')
2711 queue_run_local = TRUE;
2715 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2716 optionally starting from a given message id. */
2718 if (*argrest == 0 &&
2719 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2722 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2723 start_queue_run_id = argv[++i];
2724 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2725 stop_queue_run_id = argv[++i];
2728 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2729 optionally local only. */
2734 queue_interval = readconf_readtime(argrest, 0, FALSE);
2736 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2737 if (queue_interval <= 0)
2739 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2746 case 'R': /* Synonymous with -qR... */
2747 receiving_message = FALSE;
2749 /* -Rf: As -R (below) but force all deliveries,
2750 -Rff: Ditto, but also thaw all frozen messages,
2751 -Rr: String is regex
2752 -Rrf: Regex and force
2753 -Rrff: Regex and force and thaw
2755 in all cases provided there are no further characters in this
2761 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2763 if (Ustrcmp(argrest, rsopts[i]) == 0)
2765 if (i != 2) queue_run_force = TRUE;
2766 if (i >= 2) deliver_selectstring_regex = TRUE;
2767 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2768 argrest += Ustrlen(rsopts[i]);
2773 /* -R: Set string to match in addresses for forced queue run to
2774 pick out particular messages. */
2778 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2780 fprintf(stderr, "exim: string expected after -R\n");
2784 else deliver_selectstring = argrest;
2788 /* -r: an obsolete synonym for -f (see above) */
2791 /* -S: Like -R but works on sender. */
2793 case 'S': /* Synonymous with -qS... */
2794 receiving_message = FALSE;
2796 /* -Sf: As -S (below) but force all deliveries,
2797 -Sff: Ditto, but also thaw all frozen messages,
2798 -Sr: String is regex
2799 -Srf: Regex and force
2800 -Srff: Regex and force and thaw
2802 in all cases provided there are no further characters in this
2808 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2810 if (Ustrcmp(argrest, rsopts[i]) == 0)
2812 if (i != 2) queue_run_force = TRUE;
2813 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2814 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2815 argrest += Ustrlen(rsopts[i]);
2820 /* -S: Set string to match in addresses for forced queue run to
2821 pick out particular messages. */
2825 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2827 fprintf(stderr, "exim: string expected after -S\n");
2831 else deliver_selectstring_sender = argrest;
2834 /* -Tqt is an option that is exclusively for use by the testing suite.
2835 It is not recognized in other circumstances. It allows for the setting up
2836 of explicit "queue times" so that various warning/retry things can be
2837 tested. Otherwise variability of clock ticks etc. cause problems. */
2840 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2841 fudged_queue_times = argv[++i];
2846 /* -t: Set flag to extract recipients from body of message. */
2849 if (*argrest == 0) extract_recipients = TRUE;
2851 /* -ti: Set flag to extract recipients from body of message, and also
2852 specify that dot does not end the message. */
2854 else if (Ustrcmp(argrest, "i") == 0)
2856 extract_recipients = TRUE;
2860 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2863 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2870 /* -U: This means "initial user submission" in sendmail, apparently. The
2871 doc claims that in future sendmail may refuse syntactically invalid
2872 messages instead of fixing them. For the moment, we just ignore it. */
2878 /* -v: verify things - this is a very low-level debugging */
2883 debug_selector |= D_v;
2884 debug_file = stderr;
2890 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2892 The -x flag tells the sendmail command that mail from a local
2893 mail program has National Language Support (NLS) extended characters
2894 in the body of the mail item. The sendmail command can send mail with
2895 extended NLS characters across networks that normally corrupts these
2898 As Exim is 8-bit clean, it just ignores this flag. */
2901 if (*argrest != 0) badarg = TRUE;
2904 /* All other initial characters are errors */
2909 } /* End of high-level switch statement */
2911 /* Failed to recognize the option, or syntax error */
2915 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2916 "option %s\n", arg);
2922 /* If -R or -S have been specified without -q, assume a single queue run. */
2924 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2925 queue_interval < 0) queue_interval = 0;
2928 /* Arguments have been processed. Check for incompatibilities. */
2932 (smtp_input || extract_recipients || recipients_arg < argc) &&
2933 (daemon_listen || queue_interval >= 0 || bi_option ||
2934 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2935 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2938 msg_action_arg > 0 &&
2939 (daemon_listen || queue_interval >= 0 || list_options ||
2940 (checking && msg_action != MSG_LOAD) ||
2941 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2944 (daemon_listen || queue_interval >= 0) &&
2945 (sender_address != NULL || list_options || list_queue || checking ||
2949 daemon_listen && queue_interval == 0
2953 (checking || smtp_input || extract_recipients ||
2954 filter_test != FTEST_NONE || bi_option)
2957 verify_address_mode &&
2958 (address_test_mode || smtp_input || extract_recipients ||
2959 filter_test != FTEST_NONE || bi_option)
2962 address_test_mode && (smtp_input || extract_recipients ||
2963 filter_test != FTEST_NONE || bi_option)
2966 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2970 deliver_selectstring != NULL && queue_interval < 0
2973 msg_action == MSG_LOAD &&
2974 (!expansion_test || expansion_test_message != NULL)
2978 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2982 /* If debugging is set up, set the file and the file descriptor to pass on to
2983 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2984 to run in the foreground. */
2986 if (debug_selector != 0)
2988 debug_file = stderr;
2989 debug_fd = fileno(debug_file);
2990 background_daemon = FALSE;
2991 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2992 if (debug_selector != D_v) /* -v only doesn't show this */
2994 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2995 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2997 show_whats_supported(stderr);
3001 /* When started with root privilege, ensure that the limits on the number of
3002 open files and the number of processes (where that is accessible) are
3003 sufficiently large, or are unset, in case Exim has been called from an
3004 environment where the limits are screwed down. Not all OS have the ability to
3005 change some of these limits. */
3009 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3015 #ifdef RLIMIT_NOFILE
3016 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3018 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3020 rlp.rlim_cur = rlp.rlim_max = 0;
3023 /* I originally chose 1000 as a nice big number that was unlikely to
3024 be exceeded. It turns out that some older OS have a fixed upper limit of
3027 if (rlp.rlim_cur < 1000)
3029 rlp.rlim_cur = rlp.rlim_max = 1000;
3030 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3032 rlp.rlim_cur = rlp.rlim_max = 256;
3033 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3034 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3041 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3043 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3045 rlp.rlim_cur = rlp.rlim_max = 0;
3048 #ifdef RLIM_INFINITY
3049 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3051 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3053 if (rlp.rlim_cur < 1000)
3055 rlp.rlim_cur = rlp.rlim_max = 1000;
3057 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3058 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3064 /* Exim is normally entered as root (but some special configurations are
3065 possible that don't do this). However, it always spins off sub-processes that
3066 set their uid and gid as required for local delivery. We don't want to pass on
3067 any extra groups that root may belong to, so we want to get rid of them all at
3070 We need to obey setgroups() at this stage, before possibly giving up root
3071 privilege for a changed configuration file, but later on we might need to
3072 check on the additional groups for the admin user privilege - can't do that
3073 till after reading the config, which might specify the exim gid. Therefore,
3074 save the group list here first. */
3076 group_count = getgroups(NGROUPS_MAX, group_list);
3078 /* There is a fundamental difference in some BSD systems in the matter of
3079 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3080 known not to be different. On the "different" systems there is a single group
3081 list, and the first entry in it is the current group. On all other versions of
3082 Unix there is a supplementary group list, which is in *addition* to the current
3083 group. Consequently, to get rid of all extraneous groups on a "standard" system
3084 you pass over 0 groups to setgroups(), while on a "different" system you pass
3085 over a single group - the current group, which is always the first group in the
3086 list. Calling setgroups() with zero groups on a "different" system results in
3087 an error return. The following code should cope with both types of system.
3089 However, if this process isn't running as root, setgroups() can't be used
3090 since you have to be root to run it, even if throwing away groups. Not being
3091 root here happens only in some unusual configurations. We just ignore the
3094 if (setgroups(0, NULL) != 0)
3096 if (setgroups(1, group_list) != 0 && !unprivileged)
3098 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3103 /* If the configuration file name has been altered by an argument on the
3104 command line (either a new file name or a macro definition) and the caller is
3105 not root or the exim user, or if this is a filter testing run, remove any
3106 setuid privilege the program has, and run as the underlying user.
3108 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3109 severely restricts the use of -C for some purposes.
3111 Otherwise, set the real ids to the effective values (should be root unless run
3112 from inetd, which it can either be root or the exim uid, if one is configured).
3114 There is a private mechanism for bypassing some of this, in order to make it
3115 possible to test lots of configurations automatically, without having either to
3116 recompile each time, or to patch in an actual configuration file name and other
3117 values (such as the path name). If running in the test harness, pretend that
3118 configuration file changes and macro definitions haven't happened. */
3121 (config_changed || macros != NULL) && /* Config changed, and */
3122 real_uid != root_uid && /* Not root, and */
3123 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3124 real_uid != exim_uid && /* Not exim, and */
3126 !running_in_test_harness /* Not fudged */
3128 expansion_test /* expansion testing */
3130 filter_test != FTEST_NONE) /* Filter testing */
3132 setgroups(group_count, group_list);
3133 exim_setugid(real_uid, real_gid, FALSE,
3134 US"-C, -D, -be or -bf forces real uid");
3135 removed_privilege = TRUE;
3137 /* In the normal case when Exim is called like this, stderr is available
3138 and should be used for any logging information because attempts to write
3139 to the log will usually fail. To arrange this, we unset really_exim. However,
3140 if no stderr is available there is no point - we might as well have a go
3141 at the log (if it fails, syslog will be written). */
3143 if (log_stderr != NULL) really_exim = FALSE;
3146 /* Privilege is to be retained for the moment. It may be dropped later,
3147 depending on the job that this Exim process has been asked to do. For now, set
3148 the real uid to the effective so that subsequent re-execs of Exim are done by a
3151 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3153 /* If testing a filter, open the file(s) now, before wasting time doing other
3154 setups and reading the message. */
3156 if ((filter_test & FTEST_SYSTEM) != 0)
3158 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3161 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3163 return EXIT_FAILURE;
3167 if ((filter_test & FTEST_USER) != 0)
3169 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3172 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3174 return EXIT_FAILURE;
3178 /* Read the main runtime configuration data; this gives up if there
3179 is a failure. It leaves the configuration file open so that the subsequent
3180 configuration data for delivery can be read if needed. */
3184 /* Handle the decoding of logging options. */
3186 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3187 log_options, log_options_count, US"log");
3191 debug_printf("configuration file is %s\n", config_main_filename);
3192 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3193 log_extra_selector);
3196 /* If domain literals are not allowed, check the sender address that was
3197 supplied with -f. Ditto for a stripped trailing dot. */
3199 if (sender_address != NULL)
3201 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3203 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3204 "allowed\n", sender_address);
3205 return EXIT_FAILURE;
3207 if (f_end_dot && !strip_trailing_dot)
3209 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3210 "(trailing dot not allowed)\n", sender_address);
3211 return EXIT_FAILURE;
3215 /* Paranoia check of maximum lengths of certain strings. There is a check
3216 on the length of the log file path in log.c, which will come into effect
3217 if there are any calls to write the log earlier than this. However, if we
3218 get this far but the string is very long, it is better to stop now than to
3219 carry on and (e.g.) receive a message and then have to collapse. The call to
3220 log_write() from here will cause the ultimate panic collapse if the complete
3221 file name exceeds the buffer length. */
3223 if (Ustrlen(log_file_path) > 200)
3224 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3225 "log_file_path is longer than 200 chars: aborting");
3227 if (Ustrlen(pid_file_path) > 200)
3228 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3229 "pid_file_path is longer than 200 chars: aborting");
3231 if (Ustrlen(spool_directory) > 200)
3232 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3233 "spool_directory is longer than 200 chars: aborting");
3235 /* Length check on the process name given to syslog for its TAG field,
3236 which is only permitted to be 32 characters or less. See RFC 3164. */
3238 if (Ustrlen(syslog_processname) > 32)
3239 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3240 "syslog_processname is longer than 32 chars: aborting");
3242 /* In some operating systems, the environment variable TMPDIR controls where
3243 temporary files are created; Exim doesn't use these (apart from when delivering
3244 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3245 If TMPDIR is found in the environment, reset it to the value defined in the
3246 TMPDIR macro, if this macro is defined. */
3251 for (p = USS environ; *p != NULL; p++)
3253 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3254 Ustrcmp(*p+7, TMPDIR) != 0)
3256 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3257 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3259 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3265 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3266 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3267 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3268 called by a user who has set the TZ variable. This then affects the timestamps
3269 in log files and in Received: headers, and any created Date: header lines. The
3270 required timezone is settable in the configuration file, so nothing can be done
3271 about this earlier - but hopefully nothing will normally be logged earlier than
3272 this. We have to make a new environment if TZ is wrong, but don't bother if
3273 timestamps_utc is set, because then all times are in UTC anyway. */
3275 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3277 timestamps_utc = TRUE;
3281 uschar *envtz = US getenv("TZ");
3282 if ((envtz == NULL && timezone_string != NULL) ||
3284 (timezone_string == NULL ||
3285 Ustrcmp(timezone_string, envtz) != 0)))
3287 uschar **p = USS environ;
3291 while (*p++ != NULL) count++;
3292 if (envtz == NULL) count++;
3293 newp = new = malloc(sizeof(uschar *) * (count + 1));
3294 for (p = USS environ; *p != NULL; p++)
3296 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3299 if (timezone_string != NULL)
3301 *newp = malloc(Ustrlen(timezone_string) + 4);
3302 sprintf(CS *newp++, "TZ=%s", timezone_string);
3307 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3308 tod_stamp(tod_log));
3312 /* Handle the case when we have removed the setuid privilege because of -C or
3313 -D. This means that the caller of Exim was not root, and, provided that
3314 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3317 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3318 were running as the exim user defined in the configuration file (different to
3319 the one in the binary). The sysadmin may expect this case to retain privilege
3320 because "the binary was called by the Exim user", but it hasn't, because of the
3321 order in which it handles this stuff. There are two possibilities:
3323 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3324 to do message deliveries. Thus, the fact that it is running as a
3325 non-privileged user is plausible, and might be wanted in some special
3326 configurations. However, really_exim will have been set false when
3327 privilege was dropped, to stop Exim trying to write to its normal log
3328 files. Therefore, re-enable normal log processing, assuming the sysadmin
3329 has set up the log directory correctly.
3331 (2) If deliver_drop_privilege is not set, the configuration won't work as
3332 apparently intended, and so we log a panic message. In order to retain
3333 root for -C or -D, the caller must either be root or the Exim user
3334 defined in the binary (when deliver_drop_ privilege is false).
3336 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3337 built-in exim user or one defined in the configuration. In either event,
3338 re-enable log processing, assuming the sysadmin knows what they are doing. */
3340 if (removed_privilege && (config_changed || macros != NULL) &&
3341 real_uid == exim_uid)
3343 #ifdef ALT_CONFIG_ROOT_ONLY
3344 really_exim = TRUE; /* let logging work normally */
3347 if (deliver_drop_privilege)
3348 really_exim = TRUE; /* let logging work normally */
3350 log_write(0, LOG_MAIN|LOG_PANIC,
3351 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3352 (int)exim_uid, config_changed? "-C" : "-D");
3356 /* Start up Perl interpreter if Perl support is configured and there is a
3357 perl_startup option, and the configuration or the command line specifies
3358 initializing starting. Note that the global variables are actually called
3359 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3362 if (perl_start_option != 0)
3363 opt_perl_at_start = (perl_start_option > 0);
3364 if (opt_perl_at_start && opt_perl_startup != NULL)
3367 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3368 errstr = init_perl(opt_perl_startup);
3371 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3372 return EXIT_FAILURE;
3374 opt_perl_started = TRUE;
3376 #endif /* EXIM_PERL */
3378 /* Log the arguments of the call if the configuration file said so. This is
3379 a debugging feature for finding out what arguments certain MUAs actually use.
3380 Don't attempt it if logging is disabled, or if listing variables or if
3381 verifying/testing addresses or expansions. */
3383 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3384 && really_exim && !list_options && !checking)
3387 uschar *p = big_buffer;
3389 (void)getcwd(CS p+4, big_buffer_size - 4);
3391 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3393 for (i = 0; i < argc; i++)
3395 int len = Ustrlen(argv[i]);
3398 if (p + len + 8 >= big_buffer + big_buffer_size)
3401 log_write(0, LOG_MAIN, "%s", big_buffer);
3402 Ustrcpy(big_buffer, "...");
3405 printing = string_printing(argv[i]);
3406 if (printing[0] == 0) quote = US"\""; else
3408 uschar *pp = printing;
3410 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3412 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3413 (p - big_buffer) - 4), printing, quote);
3417 if ((log_extra_selector & LX_arguments) != 0)
3418 log_write(0, LOG_MAIN, "%s", big_buffer);
3420 debug_printf("%s\n", big_buffer);
3423 /* Set the working directory to be the top-level spool directory. We don't rely
3424 on this in the code, which always uses fully qualified names, but it's useful
3425 for core dumps etc. Don't complain if it fails - the spool directory might not
3426 be generally accessible and calls with the -C option (and others) have lost
3427 privilege by now. Before the chdir, we try to ensure that the directory exists.
3430 if (Uchdir(spool_directory) != 0)
3432 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3433 (void)Uchdir(spool_directory);
3436 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3437 alias file. Exim doesn't have such a concept, but this call is screwed into
3438 Sun's YP makefiles. Handle this by calling a configured script, as the real
3439 user who called Exim. The -oA option can be used to pass an argument to the
3444 (void)fclose(config_file);
3445 if (bi_command != NULL)
3449 argv[i++] = bi_command;
3450 if (alias_arg != NULL) argv[i++] = alias_arg;
3453 setgroups(group_count, group_list);
3454 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3456 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3457 (argv[1] == NULL)? US"" : argv[1]);
3459 execv(CS argv[0], (char *const *)argv);
3460 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3465 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3470 /* If an action on specific messages is requested, or if a daemon or queue
3471 runner is being started, we need to know if Exim was called by an admin user.
3472 This is the case if the real user is root or exim, or if the real group is
3473 exim, or if one of the supplementary groups is exim or a group listed in
3474 admin_groups. We don't fail all message actions immediately if not admin_user,
3475 since some actions can be performed by non-admin users. Instead, set admin_user
3476 for later interrogation. */
3478 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3483 for (i = 0; i < group_count; i++)
3485 if (group_list[i] == exim_gid) admin_user = TRUE;
3486 else if (admin_groups != NULL)
3488 for (j = 1; j <= (int)(admin_groups[0]); j++)
3489 if (admin_groups[j] == group_list[i])
3490 { admin_user = TRUE; break; }
3492 if (admin_user) break;
3496 /* Another group of privileged users are the trusted users. These are root,
3497 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3498 are permitted to specify sender_addresses with -f on the command line, and
3499 other message parameters as well. */
3501 if (real_uid == root_uid || real_uid == exim_uid)
3502 trusted_caller = TRUE;
3507 if (trusted_users != NULL)
3509 for (i = 1; i <= (int)(trusted_users[0]); i++)
3510 if (trusted_users[i] == real_uid)
3511 { trusted_caller = TRUE; break; }
3514 if (!trusted_caller && trusted_groups != NULL)
3516 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3518 if (trusted_groups[i] == real_gid)
3519 trusted_caller = TRUE;
3520 else for (j = 0; j < group_count; j++)
3522 if (trusted_groups[i] == group_list[j])
3523 { trusted_caller = TRUE; break; }
3525 if (trusted_caller) break;
3530 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3531 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3533 /* Only an admin user may start the daemon or force a queue run in the default
3534 configuration, but the queue run restriction can be relaxed. Only an admin
3535 user may request that a message be returned to its sender forthwith. Only an
3536 admin user may specify a debug level greater than D_v (because it might show
3537 passwords, etc. in lookup queries). Only an admin user may request a queue
3542 BOOL debugset = (debug_selector & ~D_v) != 0;
3543 if (deliver_give_up || daemon_listen ||
3544 (count_queue && queue_list_requires_admin) ||
3545 (list_queue && queue_list_requires_admin) ||
3546 (queue_interval >= 0 && prod_requires_admin) ||
3547 (debugset && !running_in_test_harness))
3549 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3554 /* If the real user is not root or the exim uid, the argument for passing
3555 in an open TCP/IP connection for another message is not permitted, nor is
3556 running with the -N option for any delivery action, unless this call to exim is
3557 one that supplied an input message, or we are using a patched exim for
3558 regression testing. */
3560 if (real_uid != root_uid && real_uid != exim_uid &&
3561 (continue_hostname != NULL ||
3563 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3564 )) && !running_in_test_harness)
3566 fprintf(stderr, "exim: Permission denied\n");
3567 return EXIT_FAILURE;
3570 /* If the caller is not trusted, certain arguments are ignored when running for
3571 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3572 Note that authority for performing certain actions on messages is tested in the
3573 queue_action() function. */
3575 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3577 sender_host_name = sender_host_address = interface_address =
3578 sender_ident = received_protocol = NULL;
3579 sender_host_port = interface_port = 0;
3580 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3583 /* If a sender host address is set, extract the optional port number off the
3584 end of it and check its syntax. Do the same thing for the interface address.
3585 Exim exits if the syntax is bad. */
3589 if (sender_host_address != NULL)
3590 sender_host_port = check_port(sender_host_address);
3591 if (interface_address != NULL)
3592 interface_port = check_port(interface_address);
3595 /* If an SMTP message is being received check to see if the standard input is a
3596 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3597 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3602 union sockaddr_46 inetd_sock;
3603 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3604 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3606 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3607 if (family == AF_INET || family == AF_INET6)
3609 union sockaddr_46 interface_sock;
3610 size = sizeof(interface_sock);
3612 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3613 interface_address = host_ntoa(-1, &interface_sock, NULL,
3616 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3618 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3621 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3622 NULL, &sender_host_port);
3623 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3624 "inetd is not supported when mua_wrapper is set");
3629 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3630 return EXIT_FAILURE;
3636 /* If the load average is going to be needed while receiving a message, get it
3637 now for those OS that require the first call to os_getloadavg() to be done as
3638 root. There will be further calls later for each message received. */
3640 #ifdef LOAD_AVG_NEEDS_ROOT
3641 if (receiving_message &&
3642 (queue_only_load >= 0 ||
3643 (is_inetd && smtp_load_reserve >= 0)
3646 load_average = os_getloadavg();
3650 /* The queue_only configuration option can be overridden by -odx on the command
3651 line, except that if queue_only_override is false, queue_only cannot be unset
3652 from the command line. */
3654 if (queue_only_set && (queue_only_override || arg_queue_only))
3655 queue_only = arg_queue_only;
3657 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3660 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3661 if (arg_smtp_receive_timeout >= 0)
3662 smtp_receive_timeout = arg_smtp_receive_timeout;
3664 /* If Exim was started with root privilege, unless we have already removed the
3665 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3666 except when starting the daemon or doing some kind of delivery or address
3667 testing (-bt). These are the only cases when root need to be retained. We run
3668 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3669 retained only for starting the daemon. We always do the initgroups() in this
3670 situation (controlled by the TRUE below), in order to be as close as possible
3671 to the state Exim usually runs in. */
3673 if (!unprivileged && /* originally had root AND */
3674 !removed_privilege && /* still got root AND */
3675 !daemon_listen && /* not starting the daemon */
3676 queue_interval <= 0 && /* (either kind of daemon) */
3678 deliver_drop_privilege || /* requested unprivileged */
3680 queue_interval < 0 && /* not running the queue */
3681 (msg_action_arg < 0 || /* and */
3682 msg_action != MSG_DELIVER) && /* not delivering and */
3683 (!checking || !address_test_mode) /* not address checking */
3687 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3690 /* When we are retaining a privileged uid, we still change to the exim gid. */
3692 else setgid(exim_gid);
3694 /* Handle a request to list the delivery queue */
3698 set_process_info("listing the queue");
3699 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3703 /* Handle a request to count the delivery queue */
3707 set_process_info("counting the queue");
3712 /* Handle actions on specific messages, except for the force delivery and
3713 message load actions, which are done below. Some actions take a whole list of
3714 message ids, which are known to continue up to the end of the arguments. Others
3715 take a single message id and then operate on the recipients list. */
3717 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3719 int yield = EXIT_SUCCESS;
3720 set_process_info("acting on specified messages");
3722 if (!one_msg_action)
3724 for (i = msg_action_arg; i < argc; i++)
3725 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3726 yield = EXIT_FAILURE;
3729 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3730 recipients_arg)) yield = EXIT_FAILURE;
3734 /* All the modes below here require the remaining configuration sections
3735 to be read, except that we can skip over the ACL setting when delivering
3736 specific messages, or doing a queue run. (For various testing cases we could
3737 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3740 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3742 /* The configuration data will have been read into POOL_PERM because we won't
3743 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3744 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3745 configuration were read into POOL_MAIN, because we don't do any resets till
3746 later on. However, it seems right, and it does ensure that both pools get used.
3749 store_pool = POOL_MAIN;
3751 /* Handle the -brt option. This is for checking out retry configurations.
3752 The next three arguments are a domain name or a complete address, and
3753 optionally two error numbers. All it does is to call the function that
3754 scans the retry configuration data. */
3756 if (test_retry_arg >= 0)
3758 retry_config *yield;
3759 int basic_errno = 0;
3763 if (test_retry_arg >= argc)
3765 printf("-brt needs a domain or address argument\n");
3766 exim_exit(EXIT_FAILURE);
3768 s1 = argv[test_retry_arg++];
3771 /* If the first argument contains no @ and no . it might be a local user
3772 or it might be a single-component name. Treat as a domain. */
3774 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3776 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3777 "being \ntreated as a one-component domain, not as a local part.\n\n",
3781 /* There may be an optional second domain arg. */
3783 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3784 s2 = argv[test_retry_arg++];
3786 /* The final arg is an error name */
3788 if (test_retry_arg < argc)
3790 uschar *ss = argv[test_retry_arg];
3792 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3795 printf("%s\n", CS error);
3796 return EXIT_FAILURE;
3799 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3800 code > 100 as an error is for matching codes to the decade. Turn them into
3801 a real error code, off the decade. */
3803 if (basic_errno == ERRNO_MAIL4XX ||
3804 basic_errno == ERRNO_RCPT4XX ||
3805 basic_errno == ERRNO_DATA4XX)
3807 int code = (more_errno >> 8) & 255;
3809 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3810 else if (code > 100)
3811 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3815 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3816 if (yield == NULL) printf("No retry information found\n"); else
3819 more_errno = yield->more_errno;
3820 printf("Retry rule: %s ", yield->pattern);
3822 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3824 printf("quota%s%s ",
3825 (more_errno > 0)? "_" : "",
3826 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3828 else if (yield->basic_errno == ECONNREFUSED)
3830 printf("refused%s%s ",
3831 (more_errno > 0)? "_" : "",
3832 (more_errno == 'M')? "MX" :
3833 (more_errno == 'A')? "A" : "");
3835 else if (yield->basic_errno == ETIMEDOUT)
3838 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3840 if (more_errno != 0) printf("_%s",
3841 (more_errno == 'M')? "MX" : "A");
3844 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3845 printf("auth_failed ");
3848 for (r = yield->rules; r != NULL; r = r->next)
3850 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3851 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3857 printf(",%d.", x/1000);
3871 exim_exit(EXIT_SUCCESS);
3874 /* Handle a request to list one or more configuration options */
3878 set_process_info("listing variables");
3879 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3880 else for (i = recipients_arg; i < argc; i++)
3883 (Ustrcmp(argv[i], "router") == 0 ||
3884 Ustrcmp(argv[i], "transport") == 0 ||
3885 Ustrcmp(argv[i], "authenticator") == 0))
3887 readconf_print(argv[i+1], argv[i]);
3890 else readconf_print(argv[i], NULL);
3892 exim_exit(EXIT_SUCCESS);
3896 /* Handle a request to deliver one or more messages that are already on the
3897 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3898 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3900 Delivery of specific messages is typically used for a small number when
3901 prodding by hand (when the option forced_delivery will be set) or when
3902 re-execing to regain root privilege. Each message delivery must happen in a
3903 separate process, so we fork a process for each one, and run them sequentially
3904 so that debugging output doesn't get intertwined, and to avoid spawning too
3905 many processes if a long list is given. However, don't fork for the last one;
3906 this saves a process in the common case when Exim is called to deliver just one
3909 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3911 if (prod_requires_admin && !admin_user)
3913 fprintf(stderr, "exim: Permission denied\n");
3914 exim_exit(EXIT_FAILURE);
3916 set_process_info("delivering specified messages");
3917 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3918 for (i = msg_action_arg; i < argc; i++)
3923 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3924 else if ((pid = fork()) == 0)
3926 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3927 _exit(EXIT_SUCCESS);
3931 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3933 exim_exit(EXIT_FAILURE);
3937 exim_exit(EXIT_SUCCESS);
3941 /* If only a single queue run is requested, without SMTP listening, we can just
3942 turn into a queue runner, with an optional starting message id. */
3944 if (queue_interval == 0 && !daemon_listen)
3946 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3947 (start_queue_run_id == NULL)? US"" : US" starting at ",
3948 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3949 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3950 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3951 set_process_info("running the queue (single queue run)");
3952 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3953 exim_exit(EXIT_SUCCESS);
3957 /* Find the login name of the real user running this process. This is always
3958 needed when receiving a message, because it is written into the spool file. It
3959 may also be used to construct a from: or a sender: header, and in this case we
3960 need the user's full name as well, so save a copy of it, checked for RFC822
3961 syntax and munged if necessary, if it hasn't previously been set by the -F
3962 argument. We may try to get the passwd entry more than once, in case NIS or
3963 other delays are in evidence. Save the home directory for use in filter testing
3968 if ((pw = getpwuid(real_uid)) != NULL)
3970 originator_login = string_copy(US pw->pw_name);
3971 originator_home = string_copy(US pw->pw_dir);
3973 /* If user name has not been set by -F, set it from the passwd entry
3974 unless -f has been used to set the sender address by a trusted user. */
3976 if (originator_name == NULL)
3978 if (sender_address == NULL ||
3979 (!trusted_caller && filter_test == FTEST_NONE))
3981 uschar *name = US pw->pw_gecos;
3982 uschar *amp = Ustrchr(name, '&');
3985 /* Most Unix specify that a '&' character in the gecos field is
3986 replaced by a copy of the login name, and some even specify that
3987 the first character should be upper cased, so that's what we do. */
3992 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3993 amp - name, name, &loffset, originator_login, amp + 1);
3994 buffer[loffset] = toupper(buffer[loffset]);
3998 /* If a pattern for matching the gecos field was supplied, apply
3999 it and then expand the name string. */
4001 if (gecos_pattern != NULL && gecos_name != NULL)
4004 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4006 if (regex_match_and_setup(re, name, 0, -1))
4008 uschar *new_name = expand_string(gecos_name);
4010 if (new_name != NULL)
4012 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4013 "gecos field \"%s\"\n", new_name, name);
4016 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4017 "\"%s\": %s\n", gecos_name, expand_string_message);
4019 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4020 "gecos field \"%s\"\n", gecos_pattern, name);
4021 store_free((void *)re);
4023 originator_name = string_copy(name);
4026 /* A trusted caller has used -f but not -F */
4028 else originator_name = US"";
4031 /* Break the retry loop */
4036 if (++i > finduser_retries) break;
4040 /* If we cannot get a user login, log the incident and give up, unless the
4041 configuration specifies something to use. When running in the test harness,
4042 any setting of unknown_login overrides the actual name. */
4044 if (originator_login == NULL || running_in_test_harness)
4046 if (unknown_login != NULL)
4048 originator_login = expand_string(unknown_login);
4049 if (originator_name == NULL && unknown_username != NULL)
4050 originator_name = expand_string(unknown_username);
4051 if (originator_name == NULL) originator_name = US"";
4053 if (originator_login == NULL)
4054 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4058 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4061 originator_name = string_copy(parse_fix_phrase(originator_name,
4062 Ustrlen(originator_name), big_buffer, big_buffer_size));
4064 /* If a message is created by this call of Exim, the uid/gid of its originator
4065 are those of the caller. These values are overridden if an existing message is
4066 read in from the spool. */
4068 originator_uid = real_uid;
4069 originator_gid = real_gid;
4071 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4072 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4074 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4075 returns. We leave this till here so that the originator_ fields are available
4076 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4079 if (daemon_listen || queue_interval > 0)
4083 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4084 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4085 "mua_wrapper is set");
4090 /* If the sender ident has not been set (by a trusted caller) set it to
4091 the caller. This will get overwritten below for an inetd call. If a trusted
4092 caller has set it empty, unset it. */
4094 if (sender_ident == NULL) sender_ident = originator_login;
4095 else if (sender_ident[0] == 0) sender_ident = NULL;
4097 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4098 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4099 originator_* variables set. */
4101 if (test_rewrite_arg >= 0)
4103 really_exim = FALSE;
4104 if (test_rewrite_arg >= argc)
4106 printf("-brw needs an address argument\n");
4107 exim_exit(EXIT_FAILURE);
4109 rewrite_test(argv[test_rewrite_arg]);
4110 exim_exit(EXIT_SUCCESS);
4113 /* A locally-supplied message is considered to be coming from a local user
4114 unless a trusted caller supplies a sender address with -f, or is passing in the
4115 message via SMTP (inetd invocation or otherwise). */
4117 if ((sender_address == NULL && !smtp_input) ||
4118 (!trusted_caller && filter_test == FTEST_NONE))
4120 sender_local = TRUE;
4122 /* A trusted caller can supply authenticated_sender and authenticated_id
4123 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4124 defaults except when host checking. */
4126 if (authenticated_sender == NULL && !host_checking)
4127 authenticated_sender = string_sprintf("%s@%s", originator_login,
4128 qualify_domain_sender);
4129 if (authenticated_id == NULL && !host_checking)
4130 authenticated_id = originator_login;
4133 /* Trusted callers are always permitted to specify the sender address.
4134 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4135 is specified is the empty address. However, if a trusted caller does not
4136 specify a sender address for SMTP input, we leave sender_address unset. This
4137 causes the MAIL commands to be honoured. */
4139 if ((!smtp_input && sender_address == NULL) ||
4140 !receive_check_set_sender(sender_address))
4142 /* Either the caller is not permitted to set a general sender, or this is
4143 non-SMTP input and the trusted caller has not set a sender. If there is no
4144 sender, or if a sender other than <> is set, override with the originator's
4145 login (which will get qualified below), except when checking things. */
4147 if (sender_address == NULL /* No sender_address set */
4149 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4150 !checking && /* Not running tests, AND */
4151 filter_test == FTEST_NONE)) /* Not testing a filter */
4153 sender_address = originator_login;
4154 sender_address_forced = FALSE;
4155 sender_address_domain = 0;
4159 /* Remember whether an untrusted caller set the sender address */
4161 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4163 /* Ensure that the sender address is fully qualified unless it is the empty
4164 address, which indicates an error message, or doesn't exist (root caller, smtp
4165 interface, no -f argument). */
4167 if (sender_address != NULL && sender_address[0] != 0 &&
4168 sender_address_domain == 0)
4169 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4170 qualify_domain_sender);
4172 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4174 /* Handle a request to verify a list of addresses, or test them for delivery.
4175 This must follow the setting of the sender address, since routers can be
4176 predicated upon the sender. If no arguments are given, read addresses from
4177 stdin. Set debug_level to at least D_v to get full output for address testing.
4180 if (verify_address_mode || address_test_mode)
4183 int flags = vopt_qualify;
4185 if (verify_address_mode)
4187 if (!verify_as_sender) flags |= vopt_is_recipient;
4188 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4193 flags |= vopt_is_recipient;
4194 debug_selector |= D_v;
4195 debug_file = stderr;
4196 debug_fd = fileno(debug_file);
4197 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4200 if (recipients_arg < argc)
4202 while (recipients_arg < argc)
4204 uschar *s = argv[recipients_arg++];
4207 BOOL finished = FALSE;
4208 uschar *ss = parse_find_address_end(s, FALSE);
4209 if (*ss == ',') *ss = 0; else finished = TRUE;
4210 test_address(s, flags, &exit_value);
4213 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4220 uschar *s = get_stdinput(NULL, NULL);
4221 if (s == NULL) break;
4222 test_address(s, flags, &exit_value);
4226 exim_exit(exit_value);
4229 /* Handle expansion checking. Either expand items on the command line, or read
4230 from stdin if there aren't any. If -Mset was specified, load the message so
4231 that its variables can be used, but restrict this facility to admin users.
4232 Otherwise, if -bem was used, read a message from stdin. */
4236 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4238 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4241 fprintf(stderr, "exim: permission denied\n");
4244 message_id = argv[msg_action_arg];
4245 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4246 if (!spool_open_datafile(message_id))
4247 printf ("Failed to load message datafile %s\n", message_id);
4248 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4249 printf ("Failed to load message %s\n", message_id);
4252 /* Read a test message from a file. We fudge it up to be on stdin, saving
4253 stdin itself for later reading of expansion strings. */
4255 else if (expansion_test_message != NULL)
4257 int save_stdin = dup(0);
4258 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4261 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4263 return EXIT_FAILURE;
4266 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4267 message_ended = END_NOTENDED;
4268 read_message_body(receive_msg(extract_recipients));
4269 message_linecount += body_linecount;
4270 (void)dup2(save_stdin, 0);
4271 (void)close(save_stdin);
4272 clearerr(stdin); /* Required by Darwin */
4275 /* Allow $recipients for this testing */
4277 enable_dollar_recipients = TRUE;
4279 /* Expand command line items */
4281 if (recipients_arg < argc)
4283 while (recipients_arg < argc)
4285 uschar *s = argv[recipients_arg++];
4286 uschar *ss = expand_string(s);
4287 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4288 else printf("%s\n", CS ss);
4296 char *(*fn_readline)(char *) = NULL;
4297 char *(*fn_addhist)(char *) = NULL;
4300 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4306 uschar *source = get_stdinput(fn_readline, fn_addhist);
4307 if (source == NULL) break;
4308 ss = expand_string(source);
4310 printf ("Failed: %s\n", expand_string_message);
4311 else printf("%s\n", CS ss);
4315 if (dlhandle != NULL) dlclose(dlhandle);
4319 /* The data file will be open after -Mset */
4321 if (deliver_datafile >= 0)
4323 (void)close(deliver_datafile);
4324 deliver_datafile = -1;
4327 exim_exit(EXIT_SUCCESS);
4331 /* The active host name is normally the primary host name, but it can be varied
4332 for hosts that want to play several parts at once. We need to ensure that it is
4333 set for host checking, and for receiving messages. */
4335 smtp_active_hostname = primary_hostname;
4336 if (raw_active_hostname != NULL)
4338 uschar *nah = expand_string(raw_active_hostname);
4341 if (!expand_string_forcedfail)
4342 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4343 "(smtp_active_hostname): %s", raw_active_hostname,
4344 expand_string_message);
4346 else if (nah[0] != 0) smtp_active_hostname = nah;
4349 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4350 given IP address so that the blocking and relay configuration can be tested.
4351 Unless a sender_ident was set by -oMt, we discard it (the default is the
4352 caller's login name). An RFC 1413 call is made only if we are running in the
4353 test harness and an incoming interface and both ports are specified, because
4354 there is no TCP/IP call to find the ident for. */
4361 if (!sender_ident_set)
4363 sender_ident = NULL;
4364 if (running_in_test_harness && sender_host_port != 0 &&
4365 interface_address != NULL && interface_port != 0)
4366 verify_get_ident(1413);
4369 /* In case the given address is a non-canonical IPv6 address, canonicize
4370 it. The code works for both IPv4 and IPv6, as it happens. */
4372 size = host_aton(sender_host_address, x);
4373 sender_host_address = store_get(48); /* large enough for full IPv6 */
4374 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4376 /* Now set up for testing */
4378 host_build_sender_fullhost();
4382 sender_local = FALSE;
4383 sender_host_notsocket = TRUE;
4384 debug_file = stderr;
4385 debug_fd = fileno(debug_file);
4386 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4387 "**** but without any ident (RFC 1413) callback.\n"
4388 "**** This is not for real!\n\n",
4389 sender_host_address);
4391 if (verify_check_host(&hosts_connection_nolog) == OK)
4392 log_write_selector &= ~L_smtp_connection;
4393 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4395 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4396 because a log line has already been written for all its failure exists
4397 (usually "connection refused: <reason>") and writing another one is
4398 unnecessary clutter. */
4400 if (smtp_start_session())
4402 reset_point = store_get(0);
4405 store_reset(reset_point);
4406 if (smtp_setup_msg() <= 0) break;
4407 if (!receive_msg(FALSE)) break;
4411 exim_exit(EXIT_SUCCESS);
4415 /* Arrange for message reception if recipients or SMTP were specified;
4416 otherwise complain unless a version print (-bV) happened or this is a filter
4417 verification test. In the former case, show the configuration file name. */
4419 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4421 if (version_printed)
4423 printf("Configuration file is %s\n", config_main_filename);
4424 return EXIT_SUCCESS;
4426 if (filter_test == FTEST_NONE)
4429 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4430 "not directly from a shell command line. Options and/or arguments control\n"
4431 "what it does when called. For a list of options, see the Exim documentation.\n");
4432 return EXIT_FAILURE;
4437 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4438 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4439 that we are not called from inetd, because that is rejected above. The
4440 following configuration settings are forced here:
4442 (1) Synchronous delivery (-odi)
4443 (2) Errors to stderr (-oep == -oeq)
4444 (3) No parallel remote delivery
4445 (4) Unprivileged delivery
4447 We don't force overall queueing options because there are several of them;
4448 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4449 to override any SMTP queueing. */
4453 synchronous_delivery = TRUE;
4454 arg_error_handling = ERRORS_STDERR;
4455 remote_max_parallel = 1;
4456 deliver_drop_privilege = TRUE;
4458 queue_smtp_domains = NULL;
4462 /* Prepare to accept one or more new messages on the standard input. When a
4463 message has been read, its id is returned in message_id[]. If doing immediate
4464 delivery, we fork a delivery process for each received message, except for the
4465 last one, where we can save a process switch.
4467 It is only in non-smtp mode that error_handling is allowed to be changed from
4468 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4469 sendmail error modes other than -oem ever actually used? Later: yes.) */
4471 if (!smtp_input) error_handling = arg_error_handling;
4473 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4474 logging being sent down the socket and make an identd call to get the
4479 (void)fclose(stderr);
4480 exim_nullstd(); /* Re-open to /dev/null */
4481 verify_get_ident(IDENT_PORT);
4482 host_build_sender_fullhost();
4483 set_process_info("handling incoming connection from %s via inetd",
4487 /* If the sender host address has been set, build sender_fullhost if it hasn't
4488 already been done (which it will have been for inetd). This caters for the
4489 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4490 so that the test for IP options is skipped for -bs input. */
4492 if (sender_host_address != NULL && sender_fullhost == NULL)
4494 host_build_sender_fullhost();
4495 set_process_info("handling incoming connection from %s via -oMa",
4497 sender_host_notsocket = TRUE;
4500 /* Otherwise, set the sender host as unknown except for inetd calls. This
4501 prevents host checking in the case of -bs not from inetd and also for -bS. */
4503 else if (!is_inetd) sender_host_unknown = TRUE;
4505 /* If stdout does not exist, then dup stdin to stdout. This can happen
4506 if exim is started from inetd. In this case fd 0 will be set to the socket,
4507 but fd 1 will not be set. This also happens for passed SMTP channels. */
4509 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4511 /* Set up the incoming protocol name and the state of the program. Root is
4512 allowed to force received protocol via the -oMr option above. If we have come
4513 via inetd, the process info has already been set up. We don't set
4514 received_protocol here for smtp input, as it varies according to
4515 batch/HELO/EHLO/AUTH/TLS. */
4519 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4520 smtp_batched_input? "batched " : "",
4521 (sender_address!= NULL)? sender_address : originator_login);
4525 if (received_protocol == NULL)
4526 received_protocol = string_sprintf("local%s", called_as);
4527 set_process_info("accepting a local non-SMTP message from <%s>",
4531 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4535 local_queue_only = queue_only;
4537 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4538 the spool if so configured. On failure, we must not attempt to send an error
4539 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4540 error code is given.) */
4542 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4544 fprintf(stderr, "exim: insufficient disk space\n");
4545 return EXIT_FAILURE;
4548 /* If this is smtp input of any kind, real or batched, handle the start of the
4551 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4552 because a log line has already been written for all its failure exists
4553 (usually "connection refused: <reason>") and writing another one is
4554 unnecessary clutter. */
4560 if (verify_check_host(&hosts_connection_nolog) == OK)
4561 log_write_selector &= ~L_smtp_connection;
4562 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4563 if (!smtp_start_session())
4566 exim_exit(EXIT_SUCCESS);
4570 /* Otherwise, set up the input size limit here. */
4574 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4575 if (expand_string_message != NULL)
4577 if (thismessage_size_limit == -1)
4578 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4579 "message_size_limit: %s", expand_string_message);
4581 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4582 "message_size_limit: %s", expand_string_message);
4586 /* Loop for several messages when reading SMTP input. If we fork any child
4587 processes, we don't want to wait for them unless synchronous delivery is
4588 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4589 same as SIG_DFL, despite the fact that documentation often lists the default as
4590 "ignore". This is a confusing area. This is what I know:
4592 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4593 processes that complete simply to go away without ever becoming defunct. You
4594 can't then wait for them - but we don't want to wait for them in the
4595 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4596 happen for all OS (e.g. *BSD is different).
4598 But that's not the end of the story. Some (many? all?) systems have the
4599 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4600 has by default, so it seems that the difference is merely one of default
4601 (compare restarting vs non-restarting signals).
4603 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4604 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4605 of the loop below. Paranoia rules.
4607 February 2003: That's *still* not the end of the story. There are now versions
4608 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4609 process then calls waitpid(), a grumble is written to the system log, because
4610 this is logically inconsistent. In other words, it doesn't like the paranoia.
4611 As a consequenc of this, the waitpid() below is now excluded if we are sure
4612 that SIG_IGN works. */
4614 if (!synchronous_delivery)
4617 struct sigaction act;
4618 act.sa_handler = SIG_IGN;
4619 sigemptyset(&(act.sa_mask));
4620 act.sa_flags = SA_NOCLDWAIT;
4621 sigaction(SIGCHLD, &act, NULL);
4623 signal(SIGCHLD, SIG_IGN);
4627 /* Save the current store pool point, for resetting at the start of
4628 each message, and save the real sender address, if any. */
4630 reset_point = store_get(0);
4631 real_sender_address = sender_address;
4633 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4634 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4639 store_reset(reset_point);
4642 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4643 input and build the recipients list, before calling receive_msg() to read the
4644 message proper. Whatever sender address is given in the SMTP transaction is
4645 often ignored for local senders - we use the actual sender, which is normally
4646 either the underlying user running this process or a -f argument provided by
4647 a trusted caller. It is saved in real_sender_address. The test for whether to
4648 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4653 if ((rc = smtp_setup_msg()) > 0)
4655 if (real_sender_address != NULL &&
4656 !receive_check_set_sender(sender_address))
4658 sender_address = raw_sender = real_sender_address;
4659 sender_address_unrewritten = NULL;
4662 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4663 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4664 the very end. The result of the ACL is ignored (as for other non-SMTP
4665 messages). It is run for its potential side effects. */
4667 if (smtp_batched_input && acl_not_smtp_start != NULL)
4669 uschar *user_msg, *log_msg;
4670 enable_dollar_recipients = TRUE;
4671 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4672 &user_msg, &log_msg);
4673 enable_dollar_recipients = FALSE;
4676 /* Now get the data for the message */
4678 more = receive_msg(extract_recipients);
4679 if (message_id[0] == 0)
4682 smtp_log_no_mail(); /* Log no mail if configured */
4683 exim_exit(EXIT_FAILURE);
4688 smtp_log_no_mail(); /* Log no mail if configured */
4689 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4693 /* In the non-SMTP case, we have all the information from the command
4694 line, but must process it in case it is in the more general RFC822
4695 format, and in any case, to detect syntax errors. Also, it appears that
4696 the use of comma-separated lists as single arguments is common, so we
4697 had better support them. */
4703 int count = argc - recipients_arg;
4704 uschar **list = argv + recipients_arg;
4706 /* These options cannot be changed dynamically for non-SMTP messages */
4708 active_local_sender_retain = local_sender_retain;
4709 active_local_from_check = local_from_check;
4711 /* Save before any rewriting */
4713 raw_sender = string_copy(sender_address);
4715 /* Loop for each argument */
4717 for (i = 0; i < count; i++)
4719 int start, end, domain;
4721 uschar *s = list[i];
4723 /* Loop for each comma-separated address */
4727 BOOL finished = FALSE;
4729 uschar *ss = parse_find_address_end(s, FALSE);
4731 if (*ss == ',') *ss = 0; else finished = TRUE;
4733 /* Check max recipients - if -t was used, these aren't recipients */
4735 if (recipients_max > 0 && ++rcount > recipients_max &&
4736 !extract_recipients)
4738 if (error_handling == ERRORS_STDERR)
4740 fprintf(stderr, "exim: too many recipients\n");
4741 exim_exit(EXIT_FAILURE);
4746 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4747 errors_sender_rc : EXIT_FAILURE;
4752 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4754 if (domain == 0 && !allow_unqualified_recipient)
4757 errmess = US"unqualified recipient address not allowed";
4760 if (recipient == NULL)
4762 if (error_handling == ERRORS_STDERR)
4764 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4765 string_printing(list[i]), errmess);
4766 exim_exit(EXIT_FAILURE);
4772 eblock.text1 = string_printing(list[i]);
4773 eblock.text2 = errmess;
4775 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4776 errors_sender_rc : EXIT_FAILURE;
4780 receive_add_recipient(recipient, -1);
4783 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4787 /* Show the recipients when debugging */
4792 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4793 if (recipients_list != NULL)
4795 debug_printf("Recipients:\n");
4796 for (i = 0; i < recipients_count; i++)
4797 debug_printf(" %s\n", recipients_list[i].address);
4801 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4802 ignored; rejecting here would just add complication, and it can just as
4803 well be done later. Allow $recipients to be visible in the ACL. */
4805 if (acl_not_smtp_start != NULL)
4807 uschar *user_msg, *log_msg;
4808 enable_dollar_recipients = TRUE;
4809 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4810 &user_msg, &log_msg);
4811 enable_dollar_recipients = FALSE;
4814 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4815 will just read the headers for the message, and not write anything onto the
4818 message_ended = END_NOTENDED;
4819 more = receive_msg(extract_recipients);
4821 /* more is always FALSE here (not SMTP message) when reading a message
4822 for real; when reading the headers of a message for filter testing,
4823 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4825 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4826 } /* Non-SMTP message reception */
4828 /* If this is a filter testing run, there are headers in store, but
4829 no message on the spool. Run the filtering code in testing mode, setting
4830 the domain to the qualify domain and the local part to the current user,
4831 unless they have been set by options. The prefix and suffix are left unset
4832 unless specified. The the return path is set to to the sender unless it has
4833 already been set from a return-path header in the message. */
4835 if (filter_test != FTEST_NONE)
4837 deliver_domain = (ftest_domain != NULL)?
4838 ftest_domain : qualify_domain_recipient;
4839 deliver_domain_orig = deliver_domain;
4840 deliver_localpart = (ftest_localpart != NULL)?
4841 ftest_localpart : originator_login;
4842 deliver_localpart_orig = deliver_localpart;
4843 deliver_localpart_prefix = ftest_prefix;
4844 deliver_localpart_suffix = ftest_suffix;
4845 deliver_home = originator_home;
4847 if (return_path == NULL)
4849 printf("Return-path copied from sender\n");
4850 return_path = string_copy(sender_address);
4854 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4856 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4858 receive_add_recipient(
4859 string_sprintf("%s%s%s@%s",
4860 (ftest_prefix == NULL)? US"" : ftest_prefix,
4862 (ftest_suffix == NULL)? US"" : ftest_suffix,
4863 deliver_domain), -1);
4865 printf("Recipient = %s\n", recipients_list[0].address);
4866 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4867 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4869 (void)chdir("/"); /* Get away from wherever the user is running this from */
4871 /* Now we run either a system filter test, or a user filter test, or both.
4872 In the latter case, headers added by the system filter will persist and be
4873 available to the user filter. We need to copy the filter variables
4876 if ((filter_test & FTEST_SYSTEM) != 0)
4878 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4879 exim_exit(EXIT_FAILURE);
4882 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4884 if ((filter_test & FTEST_USER) != 0)
4886 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4887 exim_exit(EXIT_FAILURE);
4890 exim_exit(EXIT_SUCCESS);
4893 /* Else act on the result of message reception. We should not get here unless
4894 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4895 TRUE. If it is not, check on the number of messages received in this
4896 connection. If that's OK and queue_only_load is set, check that the load
4897 average is below it. If it is not, set local_queue_only TRUE. Note that it
4898 then remains this way for any subsequent messages on the same SMTP connection.
4899 This is a deliberate choice; even though the load average may fall, it
4900 doesn't seem right to deliver later messages on the same call when not
4901 delivering earlier ones. */
4903 if (!local_queue_only)
4905 if (smtp_accept_queue_per_connection > 0 &&
4906 receive_messagecount > smtp_accept_queue_per_connection)
4908 local_queue_only = TRUE;
4909 queue_only_reason = 2;
4911 else if (queue_only_load >= 0)
4913 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4914 if (local_queue_only) queue_only_reason = 3;
4918 /* If running as an MUA wrapper, all queueing options and freezing options
4922 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4924 /* Log the queueing here, when it will get a message id attached, but
4925 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4928 if (local_queue_only) switch(queue_only_reason)
4931 log_write(L_delay_delivery,
4932 LOG_MAIN, "no immediate delivery: more than %d messages "
4933 "received in one connection", smtp_accept_queue_per_connection);
4937 log_write(L_delay_delivery,
4938 LOG_MAIN, "no immediate delivery: load average %.2f",
4939 (double)load_average/1000.0);
4943 /* Else do the delivery unless the ACL or local_scan() called for queue only
4944 or froze the message. Always deliver in a separate process. A fork failure is
4945 not a disaster, as the delivery will eventually happen on a subsequent queue
4946 run. The search cache must be tidied before the fork, as the parent will
4947 do it before exiting. The child will trigger a lookup failure and
4948 thereby defer the delivery if it tries to use (for example) a cached ldap
4949 connection that the parent has called unbind on. */
4951 else if (!queue_only_policy && !deliver_freeze)
4956 if ((pid = fork()) == 0)
4959 close_unwanted(); /* Close unwanted file descriptors and TLS */
4960 exim_nullstd(); /* Ensure std{in,out,err} exist */
4962 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4963 mode, deliver_drop_privilege is forced TRUE). */
4965 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4967 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4969 /* Control does not return here. */
4972 /* No need to re-exec */
4974 rc = deliver_message(message_id, FALSE, FALSE);
4976 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4977 EXIT_SUCCESS : EXIT_FAILURE);
4982 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4983 "process: %s", strerror(errno));
4986 /* In the parent, wait if synchronous delivery is required. This will
4987 always be the case in MUA wrapper mode. */
4989 else if (synchronous_delivery)
4992 while (wait(&status) != pid);
4993 if ((status & 0x00ff) != 0)
4994 log_write(0, LOG_MAIN|LOG_PANIC,
4995 "process %d crashed with signal %d while delivering %s",
4996 (int)pid, status & 0x00ff, message_id);
4997 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5001 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5002 automatically reaps children (see comments above the loop), clear away any
5003 finished subprocesses here, in case there are lots of messages coming in
5004 from the same source. */
5006 #ifndef SIG_IGN_WORKS
5007 while (waitpid(-1, NULL, WNOHANG) > 0);
5011 exim_exit(EXIT_SUCCESS); /* Never returns */
5012 return 0; /* To stop compiler warning */