1 /* $Cambridge: exim/src/src/exim.c,v 1.44 2006/10/02 13:38:18 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
390 filename the file name
391 options the fopen() options
392 mode the required mode
394 Returns: the fopened FILE or NULL
398 modefopen(uschar *filename, char *options, mode_t mode)
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("> ");
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 *ftest_domain = NULL;
1304 uschar *ftest_localpart = NULL;
1305 uschar *ftest_prefix = NULL;
1306 uschar *ftest_suffix = NULL;
1307 uschar *real_sender_address;
1308 uschar *originator_home = US"/";
1312 struct stat statbuf;
1313 pid_t passed_qr_pid = (pid_t)0;
1314 int passed_qr_pipe = -1;
1315 gid_t group_list[NGROUPS_MAX];
1317 /* Possible options for -R and -S */
1319 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1321 /* Need to define this in case we need to change the environment in order
1322 to get rid of a bogus time zone. We have to make it char rather than uschar
1323 because some OS define it in /usr/include/unistd.h. */
1325 extern char **environ;
1327 /* If the Exim user and/or group and/or the configuration file owner/group were
1328 defined by ref:name at build time, we must now find the actual uid/gid values.
1329 This is a feature to make the lives of binary distributors easier. */
1331 #ifdef EXIM_USERNAME
1332 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1334 exim_gid = pw->pw_gid;
1338 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1344 #ifdef EXIM_GROUPNAME
1345 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1347 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1353 #ifdef CONFIGURE_OWNERNAME
1354 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1356 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1357 CONFIGURE_OWNERNAME);
1362 #ifdef CONFIGURE_GROUPNAME
1363 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1365 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1366 CONFIGURE_GROUPNAME);
1371 /* In the Cygwin environment, some initialization needs doing. It is fudged
1372 in by means of this macro. */
1378 /* Check a field which is patched when we are running Exim within its
1379 testing harness; do a fast initial check, and then the whole thing. */
1381 running_in_test_harness =
1382 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1384 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1385 at the start of a program; however, it seems that some environments do not
1386 follow this. A "strange" locale can affect the formatting of timestamps, so we
1389 setlocale(LC_ALL, "C");
1391 /* Set up the default handler for timing using alarm(). */
1393 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1395 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1396 because store_malloc writes a log entry on failure. */
1398 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1399 if (log_buffer == NULL)
1401 fprintf(stderr, "exim: failed to get store for log buffer\n");
1405 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1406 NULL when the daemon is run and the file is closed. We have to use this
1407 indirection, because some systems don't allow writing to the variable "stderr".
1410 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1412 /* Arrange for the PCRE regex library to use our store functions. Note that
1413 the normal calls are actually macros that add additional arguments for
1414 debugging purposes so we have to assign specially constructed functions here.
1415 The default is to use store in the stacking pool, but this is overridden in the
1416 regex_must_compile() function. */
1418 pcre_malloc = function_store_get;
1419 pcre_free = function_dummy_free;
1421 /* Ensure there is a big buffer for temporary use in several places. It is put
1422 in malloc store so that it can be freed for enlargement if necessary. */
1424 big_buffer = store_malloc(big_buffer_size);
1426 /* Set up the handler for the data request signal, and set the initial
1427 descriptive text. */
1429 set_process_info("initializing");
1430 os_restarting_signal(SIGUSR1, usr1_handler);
1432 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1433 in the daemon code. For the rest of Exim's uses, we ignore it. */
1435 signal(SIGHUP, SIG_IGN);
1437 /* We don't want to die on pipe errors as the code is written to handle
1438 the write error instead. */
1440 signal(SIGPIPE, SIG_IGN);
1442 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1443 set to SIG_IGN. This causes subprocesses that complete before the parent
1444 process waits for them not to hang around, so when Exim calls wait(), nothing
1445 is there. The wait() code has been made robust against this, but let's ensure
1446 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1447 ending status. We use sigaction rather than plain signal() on those OS where
1448 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1449 problem on AIX with this.) */
1453 struct sigaction act;
1454 act.sa_handler = SIG_DFL;
1455 sigemptyset(&(act.sa_mask));
1457 sigaction(SIGCHLD, &act, NULL);
1460 signal(SIGCHLD, SIG_DFL);
1463 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1468 /* Set up the version number. Set up the leading 'E' for the external form of
1469 message ids, set the pointer to the internal form, and initialize it to
1470 indicate no message being processed. */
1473 message_id_option[0] = '-';
1474 message_id_external = message_id_option + 1;
1475 message_id_external[0] = 'E';
1476 message_id = message_id_external + 1;
1479 /* Set the umask to zero so that any files Exim creates using open() are
1480 created with the modes that it specifies. NOTE: Files created with fopen() have
1481 a problem, which was not recognized till rather late (February 2006). With this
1482 umask, such files will be world writeable. (They are all content scanning files
1483 in the spool directory, which isn't world-accessible, so this is not a
1484 disaster, but it's untidy.) I don't want to change this overall setting,
1485 however, because it will interact badly with the open() calls. Instead, there's
1486 now a function called modefopen() that fiddles with the umask while calling
1491 /* Precompile the regular expression for matching a message id. Keep this in
1492 step with the code that generates ids in the accept.c module. We need to do
1493 this here, because the -M options check their arguments for syntactic validity
1494 using mac_ismsgid, which uses this. */
1497 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1499 /* Precompile the regular expression that is used for matching an SMTP error
1500 code, possibly extended, at the start of an error message. */
1503 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1506 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1507 this seems to be a generally accepted convention, since one finds symbolic
1508 links called "mailq" in standard OS configurations. */
1510 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1511 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1514 receiving_message = FALSE;
1515 called_as = US"-mailq";
1518 /* If the program is called as "rmail" treat it as equivalent to
1519 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1520 i.e. preventing a single dot on a line from terminating the message, and
1521 returning with zero return code, even in cases of error (provided an error
1522 message has been sent). */
1524 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1525 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1528 called_as = US"-rmail";
1529 errors_sender_rc = EXIT_SUCCESS;
1532 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1533 this is a smail convention. */
1535 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1536 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1538 smtp_input = smtp_batched_input = TRUE;
1539 called_as = US"-rsmtp";
1542 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1543 this is a smail convention. */
1545 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1546 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1549 receiving_message = FALSE;
1550 called_as = US"-runq";
1553 /* If the program is called as "newaliases" treat it as equivalent to
1554 "exim -bi"; this is a sendmail convention. */
1556 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1557 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1560 receiving_message = FALSE;
1561 called_as = US"-newaliases";
1564 /* Save the original effective uid for a couple of uses later. It should
1565 normally be root, but in some esoteric environments it may not be. */
1567 original_euid = geteuid();
1569 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1570 to be the same as the real ones. This makes a difference only if Exim is setuid
1571 (or setgid) to something other than root, which could be the case in some
1572 special configurations. */
1574 real_uid = getuid();
1575 real_gid = getgid();
1577 if (real_uid == root_uid)
1583 /* If neither the original real uid nor the original euid was root, Exim is
1584 running in an unprivileged state. */
1586 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1588 /* If the first argument is --help, pretend there are no arguments. This will
1589 cause a brief message to be given. */
1591 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1593 /* Scan the program's arguments. Some can be dealt with right away; others are
1594 simply recorded for checking and handling afterwards. Do a high-level switch
1595 on the second character (the one after '-'), to save some effort. */
1597 for (i = 1; i < argc; i++)
1599 BOOL badarg = FALSE;
1600 uschar *arg = argv[i];
1604 /* An argument not starting with '-' is the start of a recipients list;
1605 break out of the options-scanning loop. */
1613 /* An option consistion of -- terminates the options */
1615 if (Ustrcmp(arg, "--") == 0)
1617 recipients_arg = i + 1;
1621 /* Handle flagged options */
1623 switchchar = arg[1];
1626 /* Make all -ex options synonymous with -oex arguments, since that
1627 is assumed by various callers. Also make -qR options synonymous with -R
1628 options, as that seems to be required as well. Allow for -qqR too, and
1629 the same for -S options. */
1631 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1632 Ustrncmp(arg+1, "qR", 2) == 0 ||
1633 Ustrncmp(arg+1, "qS", 2) == 0)
1635 switchchar = arg[2];
1638 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1640 switchchar = arg[3];
1642 queue_2stage = TRUE;
1645 /* Make -r synonymous with -f, since it is a documented alias */
1647 else if (arg[1] == 'r') switchchar = 'f';
1649 /* Make -ov synonymous with -v */
1651 else if (Ustrcmp(arg, "-ov") == 0)
1657 /* High-level switch on active initial letter */
1661 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1662 so has no need of it. */
1665 if (*argrest == 0) i++; /* Skip over the type */
1670 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1672 /* -bd: Run in daemon mode, awaiting SMTP connections.
1673 -bdf: Ditto, but in the foreground.
1676 if (*argrest == 'd')
1678 daemon_listen = TRUE;
1679 if (*(++argrest) == 'f') background_daemon = FALSE;
1680 else if (*argrest != 0) { badarg = TRUE; break; }
1683 /* -be: Run in expansion test mode */
1685 else if (*argrest == 'e')
1686 expansion_test = checking = TRUE;
1688 /* -bF: Run system filter test */
1690 else if (*argrest == 'F')
1692 filter_test |= FTEST_SYSTEM;
1693 if (*(++argrest) != 0) { badarg = TRUE; break; }
1694 if (++i < argc) filter_test_sfile = argv[i]; else
1696 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1701 /* -bf: Run user filter test
1702 -bfd: Set domain for filter testing
1703 -bfl: Set local part for filter testing
1704 -bfp: Set prefix for filter testing
1705 -bfs: Set suffix for filter testing
1708 else if (*argrest == 'f')
1710 if (*(++argrest) == 0)
1712 filter_test |= FTEST_USER;
1713 if (++i < argc) filter_test_ufile = argv[i]; else
1715 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1723 fprintf(stderr, "exim: string expected after %s\n", arg);
1726 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1727 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1728 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1729 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1730 else { badarg = TRUE; break; }
1734 /* -bh: Host checking - an IP address must follow. */
1736 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1738 if (++i >= argc) { badarg = TRUE; break; }
1739 sender_host_address = argv[i];
1740 host_checking = checking = log_testing_mode = TRUE;
1741 host_checking_callout = argrest[1] == 'c';
1744 /* -bi: This option is used by sendmail to initialize *the* alias file,
1745 though it has the -oA option to specify a different file. Exim has no
1746 concept of *the* alias file, but since Sun's YP make script calls
1747 sendmail this way, some support must be provided. */
1749 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1751 /* -bm: Accept and deliver message - the default option. Reinstate
1752 receiving_message, which got turned off for all -b options. */
1754 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1756 /* -bnq: For locally originating messages, do not qualify unqualified
1757 addresses. In the envelope, this causes errors; in header lines they
1760 else if (Ustrcmp(argrest, "nq") == 0)
1762 allow_unqualified_sender = FALSE;
1763 allow_unqualified_recipient = FALSE;
1766 /* -bpxx: List the contents of the mail queue, in various forms. If
1767 the option is -bpc, just a queue count is needed. Otherwise, if the
1768 first letter after p is r, then order is random. */
1770 else if (*argrest == 'p')
1772 if (*(++argrest) == 'c')
1775 if (*(++argrest) != 0) badarg = TRUE;
1779 if (*argrest == 'r')
1781 list_queue_option = 8;
1784 else list_queue_option = 0;
1788 /* -bp: List the contents of the mail queue, top-level only */
1790 if (*argrest == 0) {}
1792 /* -bpu: List the contents of the mail queue, top-level undelivered */
1794 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1796 /* -bpa: List the contents of the mail queue, including all delivered */
1798 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1800 /* Unknown after -bp[r] */
1810 /* -bP: List the configuration variables given as the address list.
1811 Force -v, so configuration errors get displayed. */
1813 else if (Ustrcmp(argrest, "P") == 0)
1815 list_options = TRUE;
1816 debug_selector |= D_v;
1817 debug_file = stderr;
1820 /* -brt: Test retry configuration lookup */
1822 else if (Ustrcmp(argrest, "rt") == 0)
1824 test_retry_arg = i + 1;
1828 /* -brw: Test rewrite configuration */
1830 else if (Ustrcmp(argrest, "rw") == 0)
1832 test_rewrite_arg = i + 1;
1836 /* -bS: Read SMTP commands on standard input, but produce no replies -
1837 all errors are reported by sending messages. */
1839 else if (Ustrcmp(argrest, "S") == 0)
1840 smtp_input = smtp_batched_input = receiving_message = TRUE;
1842 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1843 on standard output. */
1845 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1847 /* -bt: address testing mode */
1849 else if (Ustrcmp(argrest, "t") == 0)
1850 address_test_mode = checking = log_testing_mode = TRUE;
1852 /* -bv: verify addresses */
1854 else if (Ustrcmp(argrest, "v") == 0)
1855 verify_address_mode = checking = log_testing_mode = TRUE;
1857 /* -bvs: verify sender addresses */
1859 else if (Ustrcmp(argrest, "vs") == 0)
1861 verify_address_mode = checking = log_testing_mode = TRUE;
1862 verify_as_sender = TRUE;
1865 /* -bV: Print version string and support details */
1867 else if (Ustrcmp(argrest, "V") == 0)
1869 printf("Exim version %s #%s built %s\n", version_string,
1870 version_cnumber, version_date);
1871 printf("%s\n", CS version_copyright);
1872 version_printed = TRUE;
1873 show_whats_supported(stdout);
1880 /* -C: change configuration file list; ignore if it isn't really
1881 a change! Enforce a prefix check if required. */
1886 if(++i < argc) argrest = argv[i]; else
1887 { badarg = TRUE; break; }
1889 if (Ustrcmp(config_main_filelist, argrest) != 0)
1891 #ifdef ALT_CONFIG_PREFIX
1893 int len = Ustrlen(ALT_CONFIG_PREFIX);
1894 uschar *list = argrest;
1896 while((filename = string_nextinlist(&list, &sep, big_buffer,
1897 big_buffer_size)) != NULL)
1899 if ((Ustrlen(filename) < len ||
1900 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1901 Ustrstr(filename, "/../") != NULL) &&
1902 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1904 fprintf(stderr, "-C Permission denied\n");
1910 config_main_filelist = argrest;
1911 config_changed = TRUE;
1916 /* -D: set up a macro definition */
1919 #ifdef DISABLE_D_OPTION
1920 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1925 macro_item *mlast = NULL;
1928 uschar *s = argrest;
1930 while (isspace(*s)) s++;
1932 if (*s < 'A' || *s > 'Z')
1934 fprintf(stderr, "exim: macro name set by -D must start with "
1935 "an upper case letter\n");
1939 while (isalnum(*s) || *s == '_')
1941 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1945 if (ptr == 0) { badarg = TRUE; break; }
1946 while (isspace(*s)) s++;
1949 if (*s++ != '=') { badarg = TRUE; break; }
1950 while (isspace(*s)) s++;
1953 for (m = macros; m != NULL; m = m->next)
1955 if (Ustrcmp(m->name, name) == 0)
1957 fprintf(stderr, "exim: duplicated -D in command line\n");
1963 m = store_get(sizeof(macro_item) + Ustrlen(name));
1965 m->command_line = TRUE;
1966 if (mlast == NULL) macros = m; else mlast->next = m;
1967 Ustrcpy(m->name, name);
1968 m->replacement = string_copy(s);
1970 if (clmacro_count >= MAX_CLMACROS)
1972 fprintf(stderr, "exim: too many -D options on command line\n");
1975 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1981 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1982 The latter is now a no-op, retained for compatibility only. If -dd is used,
1983 debugging subprocesses of the daemon is disabled. */
1986 if (Ustrcmp(argrest, "ropcr") == 0)
1988 /* drop_cr = TRUE; */
1991 /* Use an intermediate variable so that we don't set debugging while
1992 decoding the debugging bits. */
1996 unsigned int selector = D_default;
1999 if (*argrest == 'd')
2001 debug_daemon = TRUE;
2005 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2006 debug_options_count, US"debug");
2007 debug_selector = selector;
2012 /* -E: This is a local error message. This option is not intended for
2013 external use at all, but is not restricted to trusted callers because it
2014 does no harm (just suppresses certain error messages) and if Exim is run
2015 not setuid root it won't always be trusted when it generates error
2016 messages using this option. If there is a message id following -E, point
2017 message_reference at it, for logging. */
2020 local_error_message = TRUE;
2021 if (mac_ismsgid(argrest)) message_reference = argrest;
2025 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2026 option, so it looks as if historically the -oex options are also callable
2027 without the leading -o. So we have to accept them. Before the switch,
2028 anything starting -oe has been converted to -e. Exim does not support all
2029 of the sendmail error options. */
2032 if (Ustrcmp(argrest, "e") == 0)
2034 arg_error_handling = ERRORS_SENDER;
2035 errors_sender_rc = EXIT_SUCCESS;
2037 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2038 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2039 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2040 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2045 /* -F: Set sender's full name, used instead of the gecos entry from
2046 the password file. Since users can usually alter their gecos entries,
2047 there's no security involved in using this instead. The data can follow
2048 the -F or be in the next argument. */
2053 if(++i < argc) argrest = argv[i]; else
2054 { badarg = TRUE; break; }
2056 originator_name = argrest;
2057 sender_name_forced = TRUE;
2061 /* -f: Set sender's address - this value is only actually used if Exim is
2062 run by a trusted user, or if untrusted_set_sender is set and matches the
2063 address, except that the null address can always be set by any user. The
2064 test for this happens later, when the value given here is ignored when not
2065 permitted. For an untrusted user, the actual sender is still put in Sender:
2066 if it doesn't match the From: header (unless no_local_from_check is set).
2067 The data can follow the -f or be in the next argument. The -r switch is an
2068 obsolete form of -f but since there appear to be programs out there that
2069 use anything that sendmail has ever supported, better accept it - the
2070 synonymizing is done before the switch above.
2072 At this stage, we must allow domain literal addresses, because we don't
2073 know what the setting of allow_domain_literals is yet. Ditto for trailing
2074 dots and strip_trailing_dot. */
2082 if (i+1 < argc) argrest = argv[++i]; else
2083 { badarg = TRUE; break; }
2087 sender_address = string_sprintf(""); /* Ensure writeable memory */
2091 uschar *temp = argrest + Ustrlen(argrest) - 1;
2092 while (temp >= argrest && isspace(*temp)) temp--;
2093 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2094 allow_domain_literals = TRUE;
2095 strip_trailing_dot = TRUE;
2096 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2097 &sender_address_domain, TRUE);
2098 allow_domain_literals = FALSE;
2099 strip_trailing_dot = FALSE;
2100 if (sender_address == NULL)
2102 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2103 return EXIT_FAILURE;
2106 sender_address_forced = TRUE;
2110 /* This is some Sendmail thing which can be ignored */
2115 /* -h: Set the hop count for an incoming message. Exim does not currently
2116 support this; it always computes it by counting the Received: headers.
2117 To put it in will require a change to the spool header file format. */
2122 if(++i < argc) argrest = argv[i]; else
2123 { badarg = TRUE; break; }
2125 if (!isdigit(*argrest)) badarg = TRUE;
2129 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2130 not to be documented for sendmail but mailx (at least) uses it) */
2133 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2138 receiving_message = FALSE;
2140 /* -MC: continue delivery of another message via an existing open
2141 file descriptor. This option is used for an internal call by the
2142 smtp transport when there is a pending message waiting to go to an
2143 address to which it has got a connection. Five subsequent arguments are
2144 required: transport name, host name, IP address, sequence number, and
2145 message_id. Transports may decline to create new processes if the sequence
2146 number gets too big. The channel is stdin. This (-MC) must be the last
2147 argument. There's a subsequent check that the real-uid is privileged.
2149 If we are running in the test harness. delay for a bit, to let the process
2150 that set this one up complete. This makes for repeatability of the logging,
2153 if (Ustrcmp(argrest, "C") == 0)
2157 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2158 return EXIT_FAILURE;
2161 if (msg_action_arg >= 0)
2163 fprintf(stderr, "exim: incompatible arguments\n");
2164 return EXIT_FAILURE;
2167 continue_transport = argv[++i];
2168 continue_hostname = argv[++i];
2169 continue_host_address = argv[++i];
2170 continue_sequence = Uatoi(argv[++i]);
2171 msg_action = MSG_DELIVER;
2172 msg_action_arg = ++i;
2173 forced_delivery = TRUE;
2174 queue_run_pid = passed_qr_pid;
2175 queue_run_pipe = passed_qr_pipe;
2177 if (!mac_ismsgid(argv[i]))
2179 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2181 return EXIT_FAILURE;
2184 if (running_in_test_harness) millisleep(500);
2188 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2189 precedes -MC (see above). The flag indicates that the host to which
2190 Exim is connected has accepted an AUTH sequence. */
2192 else if (Ustrcmp(argrest, "CA") == 0)
2194 smtp_authenticated = TRUE;
2198 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2199 it preceded -MC (see above) */
2201 else if (Ustrcmp(argrest, "CP") == 0)
2203 smtp_use_pipelining = TRUE;
2207 /* -MCQ: pass on the pid of the queue-running process that started
2208 this chain of deliveries and the fd of its synchronizing pipe; this
2209 is useful only when it precedes -MC (see above) */
2211 else if (Ustrcmp(argrest, "CQ") == 0)
2213 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2215 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2220 /* -MCS: set the smtp_use_size flag; this is useful only when it
2221 precedes -MC (see above) */
2223 else if (Ustrcmp(argrest, "CS") == 0)
2225 smtp_use_size = TRUE;
2229 /* -MCT: set the tls_offered flag; this is useful only when it
2230 precedes -MC (see above). The flag indicates that the host to which
2231 Exim is connected has offered TLS support. */
2234 else if (Ustrcmp(argrest, "CT") == 0)
2241 /* -M[x]: various operations on the following list of message ids:
2242 -M deliver the messages, ignoring next retry times and thawing
2243 -Mc deliver the messages, checking next retry times, no thawing
2244 -Mf freeze the messages
2245 -Mg give up on the messages
2246 -Mt thaw the messages
2247 -Mrm remove the messages
2248 In the above cases, this must be the last option. There are also the
2249 following options which are followed by a single message id, and which
2250 act on that message. Some of them use the "recipient" addresses as well.
2251 -Mar add recipient(s)
2252 -Mmad mark all recipients delivered
2253 -Mmd mark recipients(s) delivered
2260 else if (*argrest == 0)
2262 msg_action = MSG_DELIVER;
2263 forced_delivery = deliver_force_thaw = TRUE;
2265 else if (Ustrcmp(argrest, "ar") == 0)
2267 msg_action = MSG_ADD_RECIPIENT;
2268 one_msg_action = TRUE;
2270 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2271 else if (Ustrcmp(argrest, "es") == 0)
2273 msg_action = MSG_EDIT_SENDER;
2274 one_msg_action = TRUE;
2276 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2277 else if (Ustrcmp(argrest, "g") == 0)
2279 msg_action = MSG_DELIVER;
2280 deliver_give_up = TRUE;
2282 else if (Ustrcmp(argrest, "mad") == 0)
2284 msg_action = MSG_MARK_ALL_DELIVERED;
2286 else if (Ustrcmp(argrest, "md") == 0)
2288 msg_action = MSG_MARK_DELIVERED;
2289 one_msg_action = TRUE;
2291 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2292 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2293 else if (Ustrcmp(argrest, "vb") == 0)
2295 msg_action = MSG_SHOW_BODY;
2296 one_msg_action = TRUE;
2298 else if (Ustrcmp(argrest, "vh") == 0)
2300 msg_action = MSG_SHOW_HEADER;
2301 one_msg_action = TRUE;
2303 else if (Ustrcmp(argrest, "vl") == 0)
2305 msg_action = MSG_SHOW_LOG;
2306 one_msg_action = TRUE;
2308 else { badarg = TRUE; break; }
2310 /* All the -Mxx options require at least one message id. */
2312 msg_action_arg = i + 1;
2313 if (msg_action_arg >= argc)
2315 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2316 return EXIT_FAILURE;
2319 /* Some require only message ids to follow */
2321 if (!one_msg_action)
2324 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2326 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2328 return EXIT_FAILURE;
2330 goto END_ARG; /* Remaining args are ids */
2333 /* Others require only one message id, possibly followed by addresses,
2334 which will be handled as normal arguments. */
2338 if (!mac_ismsgid(argv[msg_action_arg]))
2340 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2341 argv[msg_action_arg], arg);
2342 return EXIT_FAILURE;
2349 /* Some programs seem to call the -om option without the leading o;
2350 for sendmail it askes for "me too". Exim always does this. */
2353 if (*argrest != 0) badarg = TRUE;
2357 /* -N: don't do delivery - a debugging option that stops transports doing
2358 their thing. It implies debugging at the D_v level. */
2363 dont_deliver = TRUE;
2364 debug_selector |= D_v;
2365 debug_file = stderr;
2371 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2377 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2378 option to the specified value. This form uses long names. We need to handle
2379 -O option=value and -Ooption=value. */
2386 fprintf(stderr, "exim: string expected after -O\n");
2394 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2397 if (*argrest == 'A')
2399 alias_arg = argrest + 1;
2400 if (alias_arg[0] == 0)
2402 if (i+1 < argc) alias_arg = argv[++i]; else
2404 fprintf(stderr, "exim: string expected after -oA\n");
2410 /* -oB: Set a connection message max value for remote deliveries */
2412 else if (*argrest == 'B')
2414 uschar *p = argrest + 1;
2417 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2419 connection_max_messages = 1;
2428 fprintf(stderr, "exim: number expected after -oB\n");
2431 connection_max_messages = Uatoi(p);
2435 /* -odb: background delivery */
2437 else if (Ustrcmp(argrest, "db") == 0)
2439 synchronous_delivery = FALSE;
2440 arg_queue_only = FALSE;
2441 queue_only_set = TRUE;
2444 /* -odf: foreground delivery (smail-compatible option); same effect as
2445 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2448 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2450 synchronous_delivery = TRUE;
2451 arg_queue_only = FALSE;
2452 queue_only_set = TRUE;
2455 /* -odq: queue only */
2457 else if (Ustrcmp(argrest, "dq") == 0)
2459 synchronous_delivery = FALSE;
2460 arg_queue_only = TRUE;
2461 queue_only_set = TRUE;
2464 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2465 but no remote delivery */
2467 else if (Ustrcmp(argrest, "dqs") == 0)
2470 arg_queue_only = FALSE;
2471 queue_only_set = TRUE;
2474 /* -oex: Sendmail error flags. As these are also accepted without the
2475 leading -o prefix, for compatibility with vacation and other callers,
2476 they are handled with -e above. */
2478 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2479 -oitrue: Another sendmail syntax for the same */
2481 else if (Ustrcmp(argrest, "i") == 0 ||
2482 Ustrcmp(argrest, "itrue") == 0)
2485 /* -oM*: Set various characteristics for an incoming message; actually
2486 acted on for trusted callers only. */
2488 else if (*argrest == 'M')
2492 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2496 /* -oMa: Set sender host address */
2498 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2500 /* -oMaa: Set authenticator name */
2502 else if (Ustrcmp(argrest, "Maa") == 0)
2503 sender_host_authenticated = argv[++i];
2505 /* -oMas: setting authenticated sender */
2507 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2509 /* -oMai: setting authenticated id */
2511 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2513 /* -oMi: Set incoming interface address */
2515 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2517 /* -oMr: Received protocol */
2519 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2521 /* -oMs: Set sender host name */
2523 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2525 /* -oMt: Set sender ident */
2527 else if (Ustrcmp(argrest, "Mt") == 0)
2529 sender_ident_set = TRUE;
2530 sender_ident = argv[++i];
2533 /* Else a bad argument */
2542 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2543 seem to call this as -m (undocumented), so that is also accepted (see
2546 else if (Ustrcmp(argrest, "m") == 0) {}
2548 /* -oo: An ancient flag for old-style addresses which still seems to
2549 crop up in some calls (see in SCO). */
2551 else if (Ustrcmp(argrest, "o") == 0) {}
2553 /* -oP <name>: set pid file path for daemon */
2555 else if (Ustrcmp(argrest, "P") == 0)
2556 override_pid_file_path = argv[++i];
2558 /* -or <n>: set timeout for non-SMTP acceptance
2559 -os <n>: set timeout for SMTP acceptance */
2561 else if (*argrest == 'r' || *argrest == 's')
2563 int *tp = (*argrest == 'r')?
2564 &arg_receive_timeout : &arg_smtp_receive_timeout;
2565 if (argrest[1] == 0)
2567 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2569 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2572 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2577 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2579 else if (Ustrcmp(argrest, "X") == 0)
2580 override_local_interfaces = argv[++i];
2582 /* Unknown -o argument */
2588 /* -ps: force Perl startup; -pd force delayed Perl startup */
2592 if (*argrest == 's' && argrest[1] == 0)
2594 perl_start_option = 1;
2597 if (*argrest == 'd' && argrest[1] == 0)
2599 perl_start_option = -1;
2604 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2605 which sets the host protocol and host name */
2609 if (i+1 < argc) argrest = argv[++i]; else
2610 { badarg = TRUE; break; }
2615 uschar *hn = Ustrchr(argrest, ':');
2618 received_protocol = argrest;
2622 received_protocol = string_copyn(argrest, hn - argrest);
2623 sender_host_name = hn + 1;
2630 receiving_message = FALSE;
2632 /* -qq...: Do queue runs in a 2-stage manner */
2634 if (*argrest == 'q')
2636 queue_2stage = TRUE;
2640 /* -qi...: Do only first (initial) deliveries */
2642 if (*argrest == 'i')
2644 queue_run_first_delivery = TRUE;
2648 /* -qf...: Run the queue, forcing deliveries
2649 -qff..: Ditto, forcing thawing as well */
2651 if (*argrest == 'f')
2653 queue_run_force = TRUE;
2654 if (*(++argrest) == 'f')
2656 deliver_force_thaw = TRUE;
2661 /* -q[f][f]l...: Run the queue only on local deliveries */
2663 if (*argrest == 'l')
2665 queue_run_local = TRUE;
2669 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2670 optionally starting from a given message id. */
2672 if (*argrest == 0 &&
2673 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2676 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2677 start_queue_run_id = argv[++i];
2678 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2679 stop_queue_run_id = argv[++i];
2682 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2683 optionally local only. */
2688 queue_interval = readconf_readtime(argrest, 0, FALSE);
2690 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2691 if (queue_interval <= 0)
2693 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2700 case 'R': /* Synonymous with -qR... */
2701 receiving_message = FALSE;
2703 /* -Rf: As -R (below) but force all deliveries,
2704 -Rff: Ditto, but also thaw all frozen messages,
2705 -Rr: String is regex
2706 -Rrf: Regex and force
2707 -Rrff: Regex and force and thaw
2709 in all cases provided there are no further characters in this
2715 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2717 if (Ustrcmp(argrest, rsopts[i]) == 0)
2719 if (i != 2) queue_run_force = TRUE;
2720 if (i >= 2) deliver_selectstring_regex = TRUE;
2721 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2722 argrest += Ustrlen(rsopts[i]);
2727 /* -R: Set string to match in addresses for forced queue run to
2728 pick out particular messages. */
2732 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2734 fprintf(stderr, "exim: string expected after -R\n");
2738 else deliver_selectstring = argrest;
2739 if (queue_interval < 0) queue_interval = 0;
2743 /* -r: an obsolete synonym for -f (see above) */
2746 /* -S: Like -R but works on sender. */
2748 case 'S': /* Synonymous with -qS... */
2749 receiving_message = FALSE;
2751 /* -Sf: As -S (below) but force all deliveries,
2752 -Sff: Ditto, but also thaw all frozen messages,
2753 -Sr: String is regex
2754 -Srf: Regex and force
2755 -Srff: Regex and force and thaw
2757 in all cases provided there are no further characters in this
2763 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2765 if (Ustrcmp(argrest, rsopts[i]) == 0)
2767 if (i != 2) queue_run_force = TRUE;
2768 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2769 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2770 argrest += Ustrlen(rsopts[i]);
2775 /* -S: Set string to match in addresses for forced queue run to
2776 pick out particular messages. */
2780 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2782 fprintf(stderr, "exim: string expected after -S\n");
2786 else deliver_selectstring_sender = argrest;
2787 if (queue_interval < 0) queue_interval = 0;
2790 /* -Tqt is an option that is exclusively for use by the testing suite.
2791 It is not recognized in other circumstances. It allows for the setting up
2792 of explicit "queue times" so that various warning/retry things can be
2793 tested. Otherwise variability of clock ticks etc. cause problems. */
2796 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2797 fudged_queue_times = argv[++i];
2802 /* -t: Set flag to extract recipients from body of message. */
2805 if (*argrest == 0) extract_recipients = TRUE;
2807 /* -ti: Set flag to extract recipients from body of message, and also
2808 specify that dot does not end the message. */
2810 else if (Ustrcmp(argrest, "i") == 0)
2812 extract_recipients = TRUE;
2816 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2819 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2826 /* -U: This means "initial user submission" in sendmail, apparently. The
2827 doc claims that in future sendmail may refuse syntactically invalid
2828 messages instead of fixing them. For the moment, we just ignore it. */
2834 /* -v: verify things - this is a very low-level debugging */
2839 debug_selector |= D_v;
2840 debug_file = stderr;
2846 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2848 The -x flag tells the sendmail command that mail from a local
2849 mail program has National Language Support (NLS) extended characters
2850 in the body of the mail item. The sendmail command can send mail with
2851 extended NLS characters across networks that normally corrupts these
2854 As Exim is 8-bit clean, it just ignores this flag. */
2857 if (*argrest != 0) badarg = TRUE;
2860 /* All other initial characters are errors */
2865 } /* End of high-level switch statement */
2867 /* Failed to recognize the option, or syntax error */
2871 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2872 "option %s\n", arg);
2878 /* Arguments have been processed. Check for incompatibilities. */
2882 (smtp_input || extract_recipients || recipients_arg < argc) &&
2883 (daemon_listen || queue_interval >= 0 || bi_option ||
2884 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2885 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2888 msg_action_arg > 0 &&
2889 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2890 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2893 (daemon_listen || queue_interval >= 0) &&
2894 (sender_address != NULL || list_options || list_queue || checking ||
2898 daemon_listen && queue_interval == 0
2902 (checking || smtp_input || extract_recipients ||
2903 filter_test != FTEST_NONE || bi_option)
2906 verify_address_mode &&
2907 (address_test_mode || smtp_input || extract_recipients ||
2908 filter_test != FTEST_NONE || bi_option)
2911 address_test_mode && (smtp_input || extract_recipients ||
2912 filter_test != FTEST_NONE || bi_option)
2915 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2919 deliver_selectstring != NULL && queue_interval < 0
2923 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2927 /* If debugging is set up, set the file and the file descriptor to pass on to
2928 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2929 to run in the foreground. */
2931 if (debug_selector != 0)
2933 debug_file = stderr;
2934 debug_fd = fileno(debug_file);
2935 background_daemon = FALSE;
2936 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2937 if (debug_selector != D_v) /* -v only doesn't show this */
2939 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2940 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2942 show_whats_supported(stderr);
2946 /* When started with root privilege, ensure that the limits on the number of
2947 open files and the number of processes (where that is accessible) are
2948 sufficiently large, or are unset, in case Exim has been called from an
2949 environment where the limits are screwed down. Not all OS have the ability to
2950 change some of these limits. */
2954 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2960 #ifdef RLIMIT_NOFILE
2961 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2963 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2965 rlp.rlim_cur = rlp.rlim_max = 0;
2968 /* I originally chose 1000 as a nice big number that was unlikely to
2969 be exceeded. It turns out that some older OS have a fixed upper limit of
2972 if (rlp.rlim_cur < 1000)
2974 rlp.rlim_cur = rlp.rlim_max = 1000;
2975 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2977 rlp.rlim_cur = rlp.rlim_max = 256;
2978 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2979 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2986 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2988 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2990 rlp.rlim_cur = rlp.rlim_max = 0;
2993 #ifdef RLIM_INFINITY
2994 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2996 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2998 if (rlp.rlim_cur < 1000)
3000 rlp.rlim_cur = rlp.rlim_max = 1000;
3002 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3003 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3009 /* Exim is normally entered as root (but some special configurations are
3010 possible that don't do this). However, it always spins off sub-processes that
3011 set their uid and gid as required for local delivery. We don't want to pass on
3012 any extra groups that root may belong to, so we want to get rid of them all at
3015 We need to obey setgroups() at this stage, before possibly giving up root
3016 privilege for a changed configuration file, but later on we might need to
3017 check on the additional groups for the admin user privilege - can't do that
3018 till after reading the config, which might specify the exim gid. Therefore,
3019 save the group list here first. */
3021 group_count = getgroups(NGROUPS_MAX, group_list);
3023 /* There is a fundamental difference in some BSD systems in the matter of
3024 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3025 known not to be different. On the "different" systems there is a single group
3026 list, and the first entry in it is the current group. On all other versions of
3027 Unix there is a supplementary group list, which is in *addition* to the current
3028 group. Consequently, to get rid of all extraneous groups on a "standard" system
3029 you pass over 0 groups to setgroups(), while on a "different" system you pass
3030 over a single group - the current group, which is always the first group in the
3031 list. Calling setgroups() with zero groups on a "different" system results in
3032 an error return. The following code should cope with both types of system.
3034 However, if this process isn't running as root, setgroups() can't be used
3035 since you have to be root to run it, even if throwing away groups. Not being
3036 root here happens only in some unusual configurations. We just ignore the
3039 if (setgroups(0, NULL) != 0)
3041 if (setgroups(1, group_list) != 0 && !unprivileged)
3043 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3048 /* If the configuration file name has been altered by an argument on the
3049 command line (either a new file name or a macro definition) and the caller is
3050 not root or the exim user, or if this is a filter testing run, remove any
3051 setuid privilege the program has, and run as the underlying user.
3053 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3054 severely restricts the use of -C for some purposes.
3056 Otherwise, set the real ids to the effective values (should be root unless run
3057 from inetd, which it can either be root or the exim uid, if one is configured).
3059 There is a private mechanism for bypassing some of this, in order to make it
3060 possible to test lots of configurations automatically, without having either to
3061 recompile each time, or to patch in an actual configuration file name and other
3062 values (such as the path name). If running in the test harness, pretend that
3063 configuration file changes and macro definitions haven't happened. */
3066 (config_changed || macros != NULL) && /* Config changed, and */
3067 real_uid != root_uid && /* Not root, and */
3068 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3069 real_uid != exim_uid && /* Not exim, and */
3071 !running_in_test_harness /* Not fudged */
3073 expansion_test /* expansion testing */
3075 filter_test != FTEST_NONE) /* Filter testing */
3077 setgroups(group_count, group_list);
3078 exim_setugid(real_uid, real_gid, FALSE,
3079 US"-C, -D, -be or -bf forces real uid");
3080 removed_privilege = TRUE;
3082 /* In the normal case when Exim is called like this, stderr is available
3083 and should be used for any logging information because attempts to write
3084 to the log will usually fail. To arrange this, we unset really_exim. However,
3085 if no stderr is available there is no point - we might as well have a go
3086 at the log (if it fails, syslog will be written). */
3088 if (log_stderr != NULL) really_exim = FALSE;
3091 /* Privilege is to be retained for the moment. It may be dropped later,
3092 depending on the job that this Exim process has been asked to do. For now, set
3093 the real uid to the effective so that subsequent re-execs of Exim are done by a
3096 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3098 /* If testing a filter, open the file(s) now, before wasting time doing other
3099 setups and reading the message. */
3101 if ((filter_test & FTEST_SYSTEM) != 0)
3103 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3106 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3108 return EXIT_FAILURE;
3112 if ((filter_test & FTEST_USER) != 0)
3114 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3117 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3119 return EXIT_FAILURE;
3123 /* Read the main runtime configuration data; this gives up if there
3124 is a failure. It leaves the configuration file open so that the subsequent
3125 configuration data for delivery can be read if needed. */
3129 /* Handle the decoding of logging options. */
3131 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3132 log_options, log_options_count, US"log");
3136 debug_printf("configuration file is %s\n", config_main_filename);
3137 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3138 log_extra_selector);
3141 /* If domain literals are not allowed, check the sender address that was
3142 supplied with -f. Ditto for a stripped trailing dot. */
3144 if (sender_address != NULL)
3146 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3148 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3149 "allowed\n", sender_address);
3150 return EXIT_FAILURE;
3152 if (f_end_dot && !strip_trailing_dot)
3154 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3155 "(trailing dot not allowed)\n", sender_address);
3156 return EXIT_FAILURE;
3160 /* Paranoia check of maximum lengths of certain strings. There is a check
3161 on the length of the log file path in log.c, which will come into effect
3162 if there are any calls to write the log earlier than this. However, if we
3163 get this far but the string is very long, it is better to stop now than to
3164 carry on and (e.g.) receive a message and then have to collapse. The call to
3165 log_write() from here will cause the ultimate panic collapse if the complete
3166 file name exceeds the buffer length. */
3168 if (Ustrlen(log_file_path) > 200)
3169 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3170 "log_file_path is longer than 200 chars: aborting");
3172 if (Ustrlen(pid_file_path) > 200)
3173 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3174 "pid_file_path is longer than 200 chars: aborting");
3176 if (Ustrlen(spool_directory) > 200)
3177 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3178 "spool_directory is longer than 200 chars: aborting");
3180 /* Length check on the process name given to syslog for its TAG field,
3181 which is only permitted to be 32 characters or less. See RFC 3164. */
3183 if (Ustrlen(syslog_processname) > 32)
3184 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3185 "syslog_processname is longer than 32 chars: aborting");
3187 /* In some operating systems, the environment variable TMPDIR controls where
3188 temporary files are created; Exim doesn't use these (apart from when delivering
3189 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3190 If TMPDIR is found in the environment, reset it to the value defined in the
3191 TMPDIR macro, if this macro is defined. */
3196 for (p = USS environ; *p != NULL; p++)
3198 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3199 Ustrcmp(*p+7, TMPDIR) != 0)
3201 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3202 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3204 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3210 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3211 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3212 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3213 called by a user who has set the TZ variable. This then affects the timestamps
3214 in log files and in Received: headers, and any created Date: header lines. The
3215 required timezone is settable in the configuration file, so nothing can be done
3216 about this earlier - but hopefully nothing will normally be logged earlier than
3217 this. We have to make a new environment if TZ is wrong, but don't bother if
3218 timestamps_utc is set, because then all times are in UTC anyway. */
3220 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3222 timestamps_utc = TRUE;
3226 uschar *envtz = US getenv("TZ");
3227 if ((envtz == NULL && timezone_string != NULL) ||
3229 (timezone_string == NULL ||
3230 Ustrcmp(timezone_string, envtz) != 0)))
3232 uschar **p = USS environ;
3236 while (*p++ != NULL) count++;
3237 if (envtz == NULL) count++;
3238 newp = new = malloc(sizeof(uschar *) * (count + 1));
3239 for (p = USS environ; *p != NULL; p++)
3241 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3244 if (timezone_string != NULL)
3246 *newp = malloc(Ustrlen(timezone_string) + 4);
3247 sprintf(CS *newp++, "TZ=%s", timezone_string);
3252 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3253 tod_stamp(tod_log));
3257 /* Handle the case when we have removed the setuid privilege because of -C or
3258 -D. This means that the caller of Exim was not root, and, provided that
3259 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3262 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3263 were running as the exim user defined in the configuration file (different to
3264 the one in the binary). The sysadmin may expect this case to retain privilege
3265 because "the binary was called by the Exim user", but it hasn't, because of the
3266 order in which it handles this stuff. There are two possibilities:
3268 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3269 to do message deliveries. Thus, the fact that it is running as a
3270 non-privileged user is plausible, and might be wanted in some special
3271 configurations. However, really_exim will have been set false when
3272 privilege was dropped, to stop Exim trying to write to its normal log
3273 files. Therefore, re-enable normal log processing, assuming the sysadmin
3274 has set up the log directory correctly.
3276 (2) If deliver_drop_privilege is not set, the configuration won't work as
3277 apparently intended, and so we log a panic message. In order to retain
3278 root for -C or -D, the caller must either be root or the Exim user
3279 defined in the binary (when deliver_drop_ privilege is false).
3281 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3282 built-in exim user or one defined in the configuration. In either event,
3283 re-enable log processing, assuming the sysadmin knows what they are doing. */
3285 if (removed_privilege && (config_changed || macros != NULL) &&
3286 real_uid == exim_uid)
3288 #ifdef ALT_CONFIG_ROOT_ONLY
3289 really_exim = TRUE; /* let logging work normally */
3292 if (deliver_drop_privilege)
3293 really_exim = TRUE; /* let logging work normally */
3295 log_write(0, LOG_MAIN|LOG_PANIC,
3296 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3297 (int)exim_uid, config_changed? "-C" : "-D");
3301 /* Start up Perl interpreter if Perl support is configured and there is a
3302 perl_startup option, and the configuration or the command line specifies
3303 initializing starting. Note that the global variables are actually called
3304 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3307 if (perl_start_option != 0)
3308 opt_perl_at_start = (perl_start_option > 0);
3309 if (opt_perl_at_start && opt_perl_startup != NULL)
3312 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3313 errstr = init_perl(opt_perl_startup);
3316 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3317 return EXIT_FAILURE;
3319 opt_perl_started = TRUE;
3321 #endif /* EXIM_PERL */
3323 /* Log the arguments of the call if the configuration file said so. This is
3324 a debugging feature for finding out what arguments certain MUAs actually use.
3325 Don't attempt it if logging is disabled, or if listing variables or if
3326 verifying/testing addresses or expansions. */
3328 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3329 && really_exim && !list_options && !checking)
3332 uschar *p = big_buffer;
3334 (void)getcwd(CS p+4, big_buffer_size - 4);
3336 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3338 for (i = 0; i < argc; i++)
3340 int len = Ustrlen(argv[i]);
3343 if (p + len + 8 >= big_buffer + big_buffer_size)
3346 log_write(0, LOG_MAIN, "%s", big_buffer);
3347 Ustrcpy(big_buffer, "...");
3350 printing = string_printing(argv[i]);
3351 if (printing[0] == 0) quote = US"\""; else
3353 uschar *pp = printing;
3355 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3357 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3358 (p - big_buffer) - 4), printing, quote);
3362 if ((log_extra_selector & LX_arguments) != 0)
3363 log_write(0, LOG_MAIN, "%s", big_buffer);
3365 debug_printf("%s\n", big_buffer);
3368 /* Set the working directory to be the top-level spool directory. We don't rely
3369 on this in the code, which always uses fully qualified names, but it's useful
3370 for core dumps etc. Don't complain if it fails - the spool directory might not
3371 be generally accessible and calls with the -C option (and others) have lost
3372 privilege by now. Before the chdir, we try to ensure that the directory exists.
3375 if (Uchdir(spool_directory) != 0)
3377 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3378 (void)Uchdir(spool_directory);
3381 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3382 alias file. Exim doesn't have such a concept, but this call is screwed into
3383 Sun's YP makefiles. Handle this by calling a configured script, as the real
3384 user who called Exim. The -oA option can be used to pass an argument to the
3389 (void)fclose(config_file);
3390 if (bi_command != NULL)
3394 argv[i++] = bi_command;
3395 if (alias_arg != NULL) argv[i++] = alias_arg;
3398 setgroups(group_count, group_list);
3399 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3401 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3402 (argv[1] == NULL)? US"" : argv[1]);
3404 execv(CS argv[0], (char *const *)argv);
3405 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3410 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3415 /* If an action on specific messages is requested, or if a daemon or queue
3416 runner is being started, we need to know if Exim was called by an admin user.
3417 This is the case if the real user is root or exim, or if the real group is
3418 exim, or if one of the supplementary groups is exim or a group listed in
3419 admin_groups. We don't fail all message actions immediately if not admin_user,
3420 since some actions can be performed by non-admin users. Instead, set admin_user
3421 for later interrogation. */
3423 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3429 for (i = 0; i < group_count; i++)
3431 if (group_list[i] == exim_gid) admin_user = TRUE;
3432 else if (admin_groups != NULL)
3434 for (j = 1; j <= (int)(admin_groups[0]); j++)
3435 if (admin_groups[j] == group_list[i])
3436 { admin_user = TRUE; break; }
3438 if (admin_user) break;
3442 /* Another group of privileged users are the trusted users. These are root,
3443 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3444 are permitted to specify sender_addresses with -f on the command line, and
3445 other message parameters as well. */
3447 if (real_uid == root_uid || real_uid == exim_uid)
3448 trusted_caller = TRUE;
3453 if (trusted_users != NULL)
3455 for (i = 1; i <= (int)(trusted_users[0]); i++)
3456 if (trusted_users[i] == real_uid)
3457 { trusted_caller = TRUE; break; }
3460 if (!trusted_caller && trusted_groups != NULL)
3462 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3464 if (trusted_groups[i] == real_gid)
3465 trusted_caller = TRUE;
3466 else for (j = 0; j < group_count; j++)
3468 if (trusted_groups[i] == group_list[j])
3469 { trusted_caller = TRUE; break; }
3471 if (trusted_caller) break;
3476 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3477 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3479 /* Only an admin user may start the daemon or force a queue run in the default
3480 configuration, but the queue run restriction can be relaxed. Only an admin
3481 user may request that a message be returned to its sender forthwith. Only an
3482 admin user may specify a debug level greater than D_v (because it might show
3483 passwords, etc. in lookup queries). Only an admin user may request a queue
3488 BOOL debugset = (debug_selector & ~D_v) != 0;
3489 if (deliver_give_up || daemon_listen ||
3490 (count_queue && queue_list_requires_admin) ||
3491 (list_queue && queue_list_requires_admin) ||
3492 (queue_interval >= 0 && prod_requires_admin) ||
3493 (debugset && !running_in_test_harness))
3495 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3500 /* If the real user is not root or the exim uid, the argument for passing
3501 in an open TCP/IP connection for another message is not permitted, nor is
3502 running with the -N option for any delivery action, unless this call to exim is
3503 one that supplied an input message, or we are using a patched exim for
3504 regression testing. */
3506 if (real_uid != root_uid && real_uid != exim_uid &&
3507 (continue_hostname != NULL ||
3509 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3510 )) && !running_in_test_harness)
3512 fprintf(stderr, "exim: Permission denied\n");
3513 return EXIT_FAILURE;
3516 /* If the caller is not trusted, certain arguments are ignored when running for
3517 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3518 Note that authority for performing certain actions on messages is tested in the
3519 queue_action() function. */
3521 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3523 sender_host_name = sender_host_address = interface_address =
3524 sender_ident = received_protocol = NULL;
3525 sender_host_port = interface_port = 0;
3526 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3529 /* If a sender host address is set, extract the optional port number off the
3530 end of it and check its syntax. Do the same thing for the interface address.
3531 Exim exits if the syntax is bad. */
3535 if (sender_host_address != NULL)
3536 sender_host_port = check_port(sender_host_address);
3537 if (interface_address != NULL)
3538 interface_port = check_port(interface_address);
3541 /* If an SMTP message is being received check to see if the standard input is a
3542 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3543 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3548 union sockaddr_46 inetd_sock;
3549 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3550 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3552 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3553 if (family == AF_INET || family == AF_INET6)
3555 union sockaddr_46 interface_sock;
3556 size = sizeof(interface_sock);
3558 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3559 interface_address = host_ntoa(-1, &interface_sock, NULL,
3562 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3564 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3567 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3568 NULL, &sender_host_port);
3569 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3570 "inetd is not supported when mua_wrapper is set");
3575 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3576 return EXIT_FAILURE;
3582 /* If the load average is going to be needed while receiving a message, get it
3583 now for those OS that require the first call to os_getloadavg() to be done as
3584 root. There will be further calls later for each message received. */
3586 #ifdef LOAD_AVG_NEEDS_ROOT
3587 if (receiving_message &&
3588 (queue_only_load >= 0 ||
3589 (is_inetd && smtp_load_reserve >= 0)
3592 load_average = os_getloadavg();
3596 /* The queue_only configuration option can be overridden by -odx on the command
3597 line, except that if queue_only_override is false, queue_only cannot be unset
3598 from the command line. */
3600 if (queue_only_set && (queue_only_override || arg_queue_only))
3601 queue_only = arg_queue_only;
3603 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3606 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3607 if (arg_smtp_receive_timeout >= 0)
3608 smtp_receive_timeout = arg_smtp_receive_timeout;
3610 /* If Exim was started with root privilege, unless we have already removed the
3611 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3612 except when starting the daemon or doing some kind of delivery or address
3613 testing (-bt). These are the only cases when root need to be retained. We run
3614 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3615 retained only for starting the daemon. We always do the initgroups() in this
3616 situation (controlled by the TRUE below), in order to be as close as possible
3617 to the state Exim usually runs in. */
3619 if (!unprivileged && /* originally had root AND */
3620 !removed_privilege && /* still got root AND */
3621 !daemon_listen && /* not starting the daemon */
3622 queue_interval <= 0 && /* (either kind of daemon) */
3624 deliver_drop_privilege || /* requested unprivileged */
3626 queue_interval < 0 && /* not running the queue */
3627 (msg_action_arg < 0 || /* and */
3628 msg_action != MSG_DELIVER) && /* not delivering and */
3629 (!checking || !address_test_mode) /* not address checking */
3633 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3636 /* When we are retaining a privileged uid, we still change to the exim gid. */
3638 else setgid(exim_gid);
3640 /* Handle a request to list the delivery queue */
3644 set_process_info("listing the queue");
3645 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3649 /* Handle a request to count the delivery queue */
3653 set_process_info("counting the queue");
3658 /* Handle actions on specific messages, except for the force delivery action,
3659 which is done below. Some actions take a whole list of message ids, which
3660 are known to continue up to the end of the arguments. Others take a single
3661 message id and then operate on the recipients list. */
3663 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3665 int yield = EXIT_SUCCESS;
3666 set_process_info("acting on specified messages");
3668 if (!one_msg_action)
3670 for (i = msg_action_arg; i < argc; i++)
3671 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3672 yield = EXIT_FAILURE;
3675 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3676 recipients_arg)) yield = EXIT_FAILURE;
3680 /* All the modes below here require the remaining configuration sections
3681 to be read, except that we can skip over the ACL setting when delivering
3682 specific messages, or doing a queue run. (For various testing cases we could
3683 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3686 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3688 /* The configuration data will have been read into POOL_PERM because we won't
3689 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3690 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3691 configuration were read into POOL_MAIN, because we don't do any resets till
3692 later on. However, it seems right, and it does ensure that both pools get used.
3695 store_pool = POOL_MAIN;
3697 /* Handle the -brt option. This is for checking out retry configurations.
3698 The next three arguments are a domain name or a complete address, and
3699 optionally two error numbers. All it does is to call the function that
3700 scans the retry configuration data. */
3702 if (test_retry_arg >= 0)
3704 retry_config *yield;
3705 int basic_errno = 0;
3709 if (test_retry_arg >= argc)
3711 printf("-brt needs a domain or address argument\n");
3712 exim_exit(EXIT_FAILURE);
3714 s1 = argv[test_retry_arg++];
3717 /* If the first argument contains no @ and no . it might be a local user
3718 or it might be a single-component name. Treat as a domain. */
3720 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3722 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3723 "being \ntreated as a one-component domain, not as a local part.\n\n",
3727 /* There may be an optional second domain arg. */
3729 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3730 s2 = argv[test_retry_arg++];
3732 /* The final arg is an error name */
3734 if (test_retry_arg < argc)
3736 uschar *ss = argv[test_retry_arg];
3738 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3741 printf("%s\n", CS error);
3742 return EXIT_FAILURE;
3745 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3746 code > 100 as an error is for matching codes to the decade. Turn them into
3747 a real error code, off the decade. */
3749 if (basic_errno == ERRNO_MAIL4XX ||
3750 basic_errno == ERRNO_RCPT4XX ||
3751 basic_errno == ERRNO_DATA4XX)
3753 int code = (more_errno >> 8) & 255;
3755 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3756 else if (code > 100)
3757 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3761 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3762 if (yield == NULL) printf("No retry information found\n"); else
3765 more_errno = yield->more_errno;
3766 printf("Retry rule: %s ", yield->pattern);
3768 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3770 printf("quota%s%s ",
3771 (more_errno > 0)? "_" : "",
3772 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3774 else if (yield->basic_errno == ECONNREFUSED)
3776 printf("refused%s%s ",
3777 (more_errno > 0)? "_" : "",
3778 (more_errno == 'M')? "MX" :
3779 (more_errno == 'A')? "A" : "");
3781 else if (yield->basic_errno == ETIMEDOUT)
3784 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3786 if (more_errno != 0) printf("_%s",
3787 (more_errno == 'M')? "MX" : "A");
3790 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3791 printf("auth_failed ");
3794 for (r = yield->rules; r != NULL; r = r->next)
3796 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3797 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3803 printf(",%d.", x/1000);
3817 exim_exit(EXIT_SUCCESS);
3820 /* Handle a request to list one or more configuration options */
3824 set_process_info("listing variables");
3825 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3826 else for (i = recipients_arg; i < argc; i++)
3829 (Ustrcmp(argv[i], "router") == 0 ||
3830 Ustrcmp(argv[i], "transport") == 0 ||
3831 Ustrcmp(argv[i], "authenticator") == 0))
3833 readconf_print(argv[i+1], argv[i]);
3836 else readconf_print(argv[i], NULL);
3838 exim_exit(EXIT_SUCCESS);
3842 /* Handle a request to deliver one or more messages that are already on the
3843 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3844 is typically used for a small number when prodding by hand (when the option
3845 forced_delivery will be set) or when re-execing to regain root privilege.
3846 Each message delivery must happen in a separate process, so we fork a process
3847 for each one, and run them sequentially so that debugging output doesn't get
3848 intertwined, and to avoid spawning too many processes if a long list is given.
3849 However, don't fork for the last one; this saves a process in the common case
3850 when Exim is called to deliver just one message. */
3852 if (msg_action_arg > 0)
3854 if (prod_requires_admin && !admin_user)
3856 fprintf(stderr, "exim: Permission denied\n");
3857 exim_exit(EXIT_FAILURE);
3859 set_process_info("delivering specified messages");
3860 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3861 for (i = msg_action_arg; i < argc; i++)
3866 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3867 else if ((pid = fork()) == 0)
3869 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3870 _exit(EXIT_SUCCESS);
3874 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3876 exim_exit(EXIT_FAILURE);
3880 exim_exit(EXIT_SUCCESS);
3884 /* If only a single queue run is requested, without SMTP listening, we can just
3885 turn into a queue runner, with an optional starting message id. */
3887 if (queue_interval == 0 && !daemon_listen)
3889 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3890 (start_queue_run_id == NULL)? US"" : US" starting at ",
3891 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3892 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3893 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3894 set_process_info("running the queue (single queue run)");
3895 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3896 exim_exit(EXIT_SUCCESS);
3900 /* Find the login name of the real user running this process. This is always
3901 needed when receiving a message, because it is written into the spool file. It
3902 may also be used to construct a from: or a sender: header, and in this case we
3903 need the user's full name as well, so save a copy of it, checked for RFC822
3904 syntax and munged if necessary, if it hasn't previously been set by the -F
3905 argument. We may try to get the passwd entry more than once, in case NIS or
3906 other delays are in evidence. Save the home directory for use in filter testing
3911 if ((pw = getpwuid(real_uid)) != NULL)
3913 originator_login = string_copy(US pw->pw_name);
3914 originator_home = string_copy(US pw->pw_dir);
3916 /* If user name has not been set by -F, set it from the passwd entry
3917 unless -f has been used to set the sender address by a trusted user. */
3919 if (originator_name == NULL)
3921 if (sender_address == NULL ||
3922 (!trusted_caller && filter_test == FTEST_NONE))
3924 uschar *name = US pw->pw_gecos;
3925 uschar *amp = Ustrchr(name, '&');
3928 /* Most Unix specify that a '&' character in the gecos field is
3929 replaced by a copy of the login name, and some even specify that
3930 the first character should be upper cased, so that's what we do. */
3935 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3936 amp - name, name, &loffset, originator_login, amp + 1);
3937 buffer[loffset] = toupper(buffer[loffset]);
3941 /* If a pattern for matching the gecos field was supplied, apply
3942 it and then expand the name string. */
3944 if (gecos_pattern != NULL && gecos_name != NULL)
3947 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3949 if (regex_match_and_setup(re, name, 0, -1))
3951 uschar *new_name = expand_string(gecos_name);
3953 if (new_name != NULL)
3955 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3956 "gecos field \"%s\"\n", new_name, name);
3959 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3960 "\"%s\": %s\n", gecos_name, expand_string_message);
3962 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3963 "gecos field \"%s\"\n", gecos_pattern, name);
3964 store_free((void *)re);
3966 originator_name = string_copy(name);
3969 /* A trusted caller has used -f but not -F */
3971 else originator_name = US"";
3974 /* Break the retry loop */
3979 if (++i > finduser_retries) break;
3983 /* If we cannot get a user login, log the incident and give up, unless the
3984 configuration specifies something to use. When running in the test harness,
3985 any setting of unknown_login overrides the actual name. */
3987 if (originator_login == NULL || running_in_test_harness)
3989 if (unknown_login != NULL)
3991 originator_login = expand_string(unknown_login);
3992 if (originator_name == NULL && unknown_username != NULL)
3993 originator_name = expand_string(unknown_username);
3994 if (originator_name == NULL) originator_name = US"";
3996 if (originator_login == NULL)
3997 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4001 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4004 originator_name = string_copy(parse_fix_phrase(originator_name,
4005 Ustrlen(originator_name), big_buffer, big_buffer_size));
4007 /* If a message is created by this call of Exim, the uid/gid of its originator
4008 are those of the caller. These values are overridden if an existing message is
4009 read in from the spool. */
4011 originator_uid = real_uid;
4012 originator_gid = real_gid;
4014 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4015 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4017 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4018 returns. We leave this till here so that the originator_ fields are available
4019 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4022 if (daemon_listen || queue_interval > 0)
4026 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4027 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4028 "mua_wrapper is set");
4033 /* If the sender ident has not been set (by a trusted caller) set it to
4034 the caller. This will get overwritten below for an inetd call. If a trusted
4035 caller has set it empty, unset it. */
4037 if (sender_ident == NULL) sender_ident = originator_login;
4038 else if (sender_ident[0] == 0) sender_ident = NULL;
4040 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4041 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4042 originator_* variables set. */
4044 if (test_rewrite_arg >= 0)
4046 really_exim = FALSE;
4047 if (test_rewrite_arg >= argc)
4049 printf("-brw needs an address argument\n");
4050 exim_exit(EXIT_FAILURE);
4052 rewrite_test(argv[test_rewrite_arg]);
4053 exim_exit(EXIT_SUCCESS);
4056 /* A locally-supplied message is considered to be coming from a local user
4057 unless a trusted caller supplies a sender address with -f, or is passing in the
4058 message via SMTP (inetd invocation or otherwise). */
4060 if ((sender_address == NULL && !smtp_input) ||
4061 (!trusted_caller && filter_test == FTEST_NONE))
4063 sender_local = TRUE;
4065 /* A trusted caller can supply authenticated_sender and authenticated_id
4066 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4067 defaults except when host checking. */
4069 if (authenticated_sender == NULL && !host_checking)
4070 authenticated_sender = string_sprintf("%s@%s", originator_login,
4071 qualify_domain_sender);
4072 if (authenticated_id == NULL && !host_checking)
4073 authenticated_id = originator_login;
4076 /* Trusted callers are always permitted to specify the sender address.
4077 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4078 is specified is the empty address. However, if a trusted caller does not
4079 specify a sender address for SMTP input, we leave sender_address unset. This
4080 causes the MAIL commands to be honoured. */
4082 if ((!smtp_input && sender_address == NULL) ||
4083 !receive_check_set_sender(sender_address))
4085 /* Either the caller is not permitted to set a general sender, or this is
4086 non-SMTP input and the trusted caller has not set a sender. If there is no
4087 sender, or if a sender other than <> is set, override with the originator's
4088 login (which will get qualified below), except when checking things. */
4090 if (sender_address == NULL /* No sender_address set */
4092 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4093 !checking && /* Not running tests, AND */
4094 filter_test == FTEST_NONE)) /* Not testing a filter */
4096 sender_address = originator_login;
4097 sender_address_forced = FALSE;
4098 sender_address_domain = 0;
4102 /* Remember whether an untrusted caller set the sender address */
4104 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4106 /* Ensure that the sender address is fully qualified unless it is the empty
4107 address, which indicates an error message, or doesn't exist (root caller, smtp
4108 interface, no -f argument). */
4110 if (sender_address != NULL && sender_address[0] != 0 &&
4111 sender_address_domain == 0)
4112 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4113 qualify_domain_sender);
4115 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4117 /* Handle a request to verify a list of addresses, or test them for delivery.
4118 This must follow the setting of the sender address, since routers can be
4119 predicated upon the sender. If no arguments are given, read addresses from
4120 stdin. Set debug_level to at least D_v to get full output for address testing.
4123 if (verify_address_mode || address_test_mode)
4126 int flags = vopt_qualify;
4128 if (verify_address_mode)
4130 if (!verify_as_sender) flags |= vopt_is_recipient;
4131 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4136 flags |= vopt_is_recipient;
4137 debug_selector |= D_v;
4138 debug_file = stderr;
4139 debug_fd = fileno(debug_file);
4140 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4143 if (recipients_arg < argc)
4145 while (recipients_arg < argc)
4147 uschar *s = argv[recipients_arg++];
4150 BOOL finished = FALSE;
4151 uschar *ss = parse_find_address_end(s, FALSE);
4152 if (*ss == ',') *ss = 0; else finished = TRUE;
4153 test_address(s, flags, &exit_value);
4156 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4163 uschar *s = get_stdinput(NULL, NULL);
4164 if (s == NULL) break;
4165 test_address(s, flags, &exit_value);
4169 exim_exit(exit_value);
4172 /* Handle expansion checking */
4176 if (recipients_arg < argc)
4178 while (recipients_arg < argc)
4180 uschar *s = argv[recipients_arg++];
4181 uschar *ss = expand_string(s);
4183 printf ("Failed: %s\n", expand_string_message);
4184 else printf("%s\n", CS ss);
4192 char *(*fn_readline)(char *) = NULL;
4193 char *(*fn_addhist)(char *) = NULL;
4196 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4202 uschar *source = get_stdinput(fn_readline, fn_addhist);
4203 if (source == NULL) break;
4204 ss = expand_string(source);
4206 printf ("Failed: %s\n", expand_string_message);
4207 else printf("%s\n", CS ss);
4211 if (dlhandle != NULL) dlclose(dlhandle);
4215 exim_exit(EXIT_SUCCESS);
4219 /* The active host name is normally the primary host name, but it can be varied
4220 for hosts that want to play several parts at once. We need to ensure that it is
4221 set for host checking, and for receiving messages. */
4223 smtp_active_hostname = primary_hostname;
4224 if (raw_active_hostname != NULL)
4226 uschar *nah = expand_string(raw_active_hostname);
4229 if (!expand_string_forcedfail)
4230 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4231 "(smtp_active_hostname): %s", raw_active_hostname,
4232 expand_string_message);
4234 else if (nah[0] != 0) smtp_active_hostname = nah;
4237 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4238 given IP address so that the blocking and relay configuration can be tested.
4239 Unless a sender_ident was set by -oMt, we discard it (the default is the
4240 caller's login name). An RFC 1413 call is made only if we are running in the
4241 test harness and an incoming interface and both ports are specified, because
4242 there is no TCP/IP call to find the ident for. */
4249 if (!sender_ident_set)
4251 sender_ident = NULL;
4252 if (running_in_test_harness && sender_host_port != 0 &&
4253 interface_address != NULL && interface_port != 0)
4254 verify_get_ident(1413);
4257 /* In case the given address is a non-canonical IPv6 address, canonicize
4258 it. The code works for both IPv4 and IPv6, as it happens. */
4260 size = host_aton(sender_host_address, x);
4261 sender_host_address = store_get(48); /* large enough for full IPv6 */
4262 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4264 /* Now set up for testing */
4266 host_build_sender_fullhost();
4270 sender_local = FALSE;
4271 sender_host_notsocket = TRUE;
4272 debug_file = stderr;
4273 debug_fd = fileno(debug_file);
4274 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4275 "**** but without any ident (RFC 1413) callback.\n"
4276 "**** This is not for real!\n\n",
4277 sender_host_address);
4279 if (verify_check_host(&hosts_connection_nolog) == OK)
4280 log_write_selector &= ~L_smtp_connection;
4281 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4283 if (smtp_start_session())
4285 reset_point = store_get(0);
4288 store_reset(reset_point);
4289 if (smtp_setup_msg() <= 0) break;
4290 if (!receive_msg(FALSE)) break;
4293 exim_exit(EXIT_SUCCESS);
4297 /* Arrange for message reception if recipients or SMTP were specified;
4298 otherwise complain unless a version print (-bV) happened or this is a filter
4299 verification test. In the former case, show the configuration file name. */
4301 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4303 if (version_printed)
4305 printf("Configuration file is %s\n", config_main_filename);
4306 return EXIT_SUCCESS;
4308 if (filter_test == FTEST_NONE)
4311 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4312 "not directly from a shell command line. Options and/or arguments control\n"
4313 "what it does when called. For a list of options, see the Exim documentation.\n");
4314 return EXIT_FAILURE;
4319 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4320 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4321 that we are not called from inetd, because that is rejected above. The
4322 following configuration settings are forced here:
4324 (1) Synchronous delivery (-odi)
4325 (2) Errors to stderr (-oep == -oeq)
4326 (3) No parallel remote delivery
4327 (4) Unprivileged delivery
4329 We don't force overall queueing options because there are several of them;
4330 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4331 to override any SMTP queueing. */
4335 synchronous_delivery = TRUE;
4336 arg_error_handling = ERRORS_STDERR;
4337 remote_max_parallel = 1;
4338 deliver_drop_privilege = TRUE;
4340 queue_smtp_domains = NULL;
4344 /* Prepare to accept one or more new messages on the standard input. When a
4345 message has been read, its id is returned in message_id[]. If doing immediate
4346 delivery, we fork a delivery process for each received message, except for the
4347 last one, where we can save a process switch.
4349 It is only in non-smtp mode that error_handling is allowed to be changed from
4350 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4351 sendmail error modes other than -oem ever actually used? Later: yes.) */
4353 if (!smtp_input) error_handling = arg_error_handling;
4355 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4356 logging being sent down the socket and make an identd call to get the
4361 (void)fclose(stderr);
4362 exim_nullstd(); /* Re-open to /dev/null */
4363 verify_get_ident(IDENT_PORT);
4364 host_build_sender_fullhost();
4365 set_process_info("handling incoming connection from %s via inetd",
4369 /* If the sender host address has been set, build sender_fullhost if it hasn't
4370 already been done (which it will have been for inetd). This caters for the
4371 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4372 so that the test for IP options is skipped for -bs input. */
4374 if (sender_host_address != NULL && sender_fullhost == NULL)
4376 host_build_sender_fullhost();
4377 set_process_info("handling incoming connection from %s via -oMa",
4379 sender_host_notsocket = TRUE;
4382 /* Otherwise, set the sender host as unknown except for inetd calls. This
4383 prevents host checking in the case of -bs not from inetd and also for -bS. */
4385 else if (!is_inetd) sender_host_unknown = TRUE;
4387 /* If stdout does not exist, then dup stdin to stdout. This can happen
4388 if exim is started from inetd. In this case fd 0 will be set to the socket,
4389 but fd 1 will not be set. This also happens for passed SMTP channels. */
4391 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4393 /* Set up the incoming protocol name and the state of the program. Root
4394 is allowed to force received protocol via the -oMr option above, and if we are
4395 in a non-local SMTP state it means we have come via inetd and the process info
4396 has already been set up. We don't set received_protocol here for smtp input,
4397 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4401 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4406 if (received_protocol == NULL)
4407 received_protocol = string_sprintf("local%s", called_as);
4408 set_process_info("accepting a local non-SMTP message from <%s>",
4412 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4416 local_queue_only = queue_only;
4418 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4419 the spool if so configured. On failure, we must not attempt to send an error
4420 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4421 error code is given.) */
4423 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4425 fprintf(stderr, "exim: insufficient disk space\n");
4426 return EXIT_FAILURE;
4429 /* If this is smtp input of any kind, handle the start of the SMTP
4436 if (verify_check_host(&hosts_connection_nolog) == OK)
4437 log_write_selector &= ~L_smtp_connection;
4438 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4439 if (!smtp_start_session())
4442 exim_exit(EXIT_SUCCESS);
4446 /* Otherwise, set up the input size limit here. */
4450 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4451 if (expand_string_message != NULL)
4453 if (thismessage_size_limit == -1)
4454 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4455 "message_size_limit: %s", expand_string_message);
4457 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4458 "message_size_limit: %s", expand_string_message);
4462 /* Loop for several messages when reading SMTP input. If we fork any child
4463 processes, we don't want to wait for them unless synchronous delivery is
4464 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4465 same as SIG_DFL, despite the fact that documentation often lists the default as
4466 "ignore". This is a confusing area. This is what I know:
4468 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4469 processes that complete simply to go away without ever becoming defunct. You
4470 can't then wait for them - but we don't want to wait for them in the
4471 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4472 happen for all OS (e.g. *BSD is different).
4474 But that's not the end of the story. Some (many? all?) systems have the
4475 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4476 has by default, so it seems that the difference is merely one of default
4477 (compare restarting vs non-restarting signals).
4479 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4480 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4481 of the loop below. Paranoia rules.
4483 February 2003: That's *still* not the end of the story. There are now versions
4484 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4485 process then calls waitpid(), a grumble is written to the system log, because
4486 this is logically inconsistent. In other words, it doesn't like the paranoia.
4487 As a consequenc of this, the waitpid() below is now excluded if we are sure
4488 that SIG_IGN works. */
4490 if (!synchronous_delivery)
4493 struct sigaction act;
4494 act.sa_handler = SIG_IGN;
4495 sigemptyset(&(act.sa_mask));
4496 act.sa_flags = SA_NOCLDWAIT;
4497 sigaction(SIGCHLD, &act, NULL);
4499 signal(SIGCHLD, SIG_IGN);
4503 /* Save the current store pool point, for resetting at the start of
4504 each message, and save the real sender address, if any. */
4506 reset_point = store_get(0);
4507 real_sender_address = sender_address;
4509 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4510 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4515 store_reset(reset_point);
4518 /* In the SMTP case, we have to handle the initial SMTP input and build the
4519 recipients list, before calling receive_msg() to read the message proper.
4520 Whatever sender address is actually given in the SMTP transaction is
4521 actually ignored for local senders - we use the actual sender, which is
4522 normally either the underlying user running this process or a -f argument
4523 provided by a trusted caller. It is saved in real_sender_address.
4525 However, if this value is NULL, we are dealing with a trusted caller when
4526 -f was not used; in this case, the SMTP sender is allowed to stand.
4528 Also, if untrusted_set_sender is set, we permit sender addresses that match
4529 anything in its list.
4531 The variable raw_sender_address holds the sender address before rewriting. */
4536 if ((rc = smtp_setup_msg()) > 0)
4538 if (real_sender_address != NULL &&
4539 !receive_check_set_sender(sender_address))
4541 sender_address = raw_sender = real_sender_address;
4542 sender_address_unrewritten = NULL;
4544 more = receive_msg(extract_recipients);
4545 if (message_id[0] == 0)
4548 exim_exit(EXIT_FAILURE);
4551 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4554 /* In the non-SMTP case, we have all the information from the command
4555 line, but must process it in case it is in the more general RFC822
4556 format, and in any case, to detect syntax errors. Also, it appears that
4557 the use of comma-separated lists as single arguments is common, so we
4558 had better support them. */
4564 int count = argc - recipients_arg;
4565 uschar **list = argv + recipients_arg;
4567 /* These options cannot be changed dynamically for non-SMTP messages */
4569 active_local_sender_retain = local_sender_retain;
4570 active_local_from_check = local_from_check;
4572 /* Save before any rewriting */
4574 raw_sender = string_copy(sender_address);
4576 /* Loop for each argument */
4578 for (i = 0; i < count; i++)
4580 int start, end, domain;
4582 uschar *s = list[i];
4584 /* Loop for each comma-separated address */
4588 BOOL finished = FALSE;
4590 uschar *ss = parse_find_address_end(s, FALSE);
4592 if (*ss == ',') *ss = 0; else finished = TRUE;
4594 /* Check max recipients - if -t was used, these aren't recipients */
4596 if (recipients_max > 0 && ++rcount > recipients_max &&
4597 !extract_recipients)
4599 if (error_handling == ERRORS_STDERR)
4601 fprintf(stderr, "exim: too many recipients\n");
4602 exim_exit(EXIT_FAILURE);
4607 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4608 errors_sender_rc : EXIT_FAILURE;
4613 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4615 if (domain == 0 && !allow_unqualified_recipient)
4618 errmess = US"unqualified recipient address not allowed";
4621 if (recipient == NULL)
4623 if (error_handling == ERRORS_STDERR)
4625 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4626 string_printing(list[i]), errmess);
4627 exim_exit(EXIT_FAILURE);
4633 eblock.text1 = string_printing(list[i]);
4634 eblock.text2 = errmess;
4636 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4637 errors_sender_rc : EXIT_FAILURE;
4641 receive_add_recipient(recipient, -1);
4644 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4648 /* Show the recipients when debugging */
4653 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4654 if (recipients_list != NULL)
4656 debug_printf("Recipients:\n");
4657 for (i = 0; i < recipients_count; i++)
4658 debug_printf(" %s\n", recipients_list[i].address);
4662 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4663 ignored; rejecting here would just add complication, and it can just as
4664 well be done later. Allow $recipients to be visible in the ACL. */
4666 if (acl_not_smtp_start != NULL)
4668 uschar *user_msg, *log_msg;
4669 enable_dollar_recipients = TRUE;
4670 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4671 &user_msg, &log_msg);
4672 enable_dollar_recipients = FALSE;
4675 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4676 will just read the headers for the message, and not write anything onto the
4679 message_ended = END_NOTENDED;
4680 more = receive_msg(extract_recipients);
4682 /* more is always FALSE here (not SMTP message) when reading a message
4683 for real; when reading the headers of a message for filter testing,
4684 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4686 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4687 } /* Non-SMTP message reception */
4689 /* If this is a filter testing run, there are headers in store, but
4690 no message on the spool. Run the filtering code in testing mode, setting
4691 the domain to the qualify domain and the local part to the current user,
4692 unless they have been set by options. The prefix and suffix are left unset
4693 unless specified. The the return path is set to to the sender unless it has
4694 already been set from a return-path header in the message. */
4696 if (filter_test != FTEST_NONE)
4698 deliver_domain = (ftest_domain != NULL)?
4699 ftest_domain : qualify_domain_recipient;
4700 deliver_domain_orig = deliver_domain;
4701 deliver_localpart = (ftest_localpart != NULL)?
4702 ftest_localpart : originator_login;
4703 deliver_localpart_orig = deliver_localpart;
4704 deliver_localpart_prefix = ftest_prefix;
4705 deliver_localpart_suffix = ftest_suffix;
4706 deliver_home = originator_home;
4708 if (return_path == NULL)
4710 printf("Return-path copied from sender\n");
4711 return_path = string_copy(sender_address);
4715 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4717 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4719 receive_add_recipient(
4720 string_sprintf("%s%s%s@%s",
4721 (ftest_prefix == NULL)? US"" : ftest_prefix,
4723 (ftest_suffix == NULL)? US"" : ftest_suffix,
4724 deliver_domain), -1);
4726 printf("Recipient = %s\n", recipients_list[0].address);
4727 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4728 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4730 (void)chdir("/"); /* Get away from wherever the user is running this from */
4732 /* Now we run either a system filter test, or a user filter test, or both.
4733 In the latter case, headers added by the system filter will persist and be
4734 available to the user filter. We need to copy the filter variables
4737 if ((filter_test & FTEST_SYSTEM) != 0)
4739 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4740 exim_exit(EXIT_FAILURE);
4743 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4745 if ((filter_test & FTEST_USER) != 0)
4747 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4748 exim_exit(EXIT_FAILURE);
4751 exim_exit(EXIT_SUCCESS);
4754 /* Else act on the result of message reception. We should not get here unless
4755 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4756 TRUE. If it is not, check on the number of messages received in this
4757 connection. If that's OK and queue_only_load is set, check that the load
4758 average is below it. If it is not, set local_queue_only TRUE. Note that it
4759 then remains this way for any subsequent messages on the same SMTP connection.
4760 This is a deliberate choice; even though the load average may fall, it
4761 doesn't seem right to deliver later messages on the same call when not
4762 delivering earlier ones. */
4764 if (!local_queue_only)
4766 if (smtp_accept_queue_per_connection > 0 &&
4767 receive_messagecount > smtp_accept_queue_per_connection)
4769 local_queue_only = TRUE;
4770 queue_only_reason = 2;
4772 else if (queue_only_load >= 0)
4774 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4775 if (local_queue_only) queue_only_reason = 3;
4779 /* If running as an MUA wrapper, all queueing options and freezing options
4783 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4785 /* Log the queueing here, when it will get a message id attached, but
4786 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4789 if (local_queue_only) switch(queue_only_reason)
4792 log_write(L_delay_delivery,
4793 LOG_MAIN, "no immediate delivery: more than %d messages "
4794 "received in one connection", smtp_accept_queue_per_connection);
4798 log_write(L_delay_delivery,
4799 LOG_MAIN, "no immediate delivery: load average %.2f",
4800 (double)load_average/1000.0);
4804 /* Else do the delivery unless the ACL or local_scan() called for queue only
4805 or froze the message. Always deliver in a separate process. A fork failure is
4806 not a disaster, as the delivery will eventually happen on a subsequent queue
4807 run. The search cache must be tidied before the fork, as the parent will
4808 do it before exiting. The child will trigger a lookup failure and
4809 thereby defer the delivery if it tries to use (for example) a cached ldap
4810 connection that the parent has called unbind on. */
4812 else if (!queue_only_policy && !deliver_freeze)
4817 if ((pid = fork()) == 0)
4820 close_unwanted(); /* Close unwanted file descriptors and TLS */
4821 exim_nullstd(); /* Ensure std{in,out,err} exist */
4823 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4824 mode, deliver_drop_privilege is forced TRUE). */
4826 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4828 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4830 /* Control does not return here. */
4833 /* No need to re-exec */
4835 rc = deliver_message(message_id, FALSE, FALSE);
4837 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4838 EXIT_SUCCESS : EXIT_FAILURE);
4843 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4844 "process: %s", strerror(errno));
4847 /* In the parent, wait if synchronous delivery is required. This will
4848 always be the case in MUA wrapper mode. */
4850 else if (synchronous_delivery)
4853 while (wait(&status) != pid);
4854 if ((status & 0x00ff) != 0)
4855 log_write(0, LOG_MAIN|LOG_PANIC,
4856 "process %d crashed with signal %d while delivering %s",
4857 (int)pid, status & 0x00ff, message_id);
4858 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4862 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4863 automatically reaps children (see comments above the loop), clear away any
4864 finished subprocesses here, in case there are lots of messages coming in
4865 from the same source. */
4867 #ifndef SIG_IGN_WORKS
4868 while (waitpid(-1, NULL, WNOHANG) > 0);
4872 exim_exit(EXIT_SUCCESS); /* Never returns */
4873 return 0; /* To stop compiler warning */