1 /* $Cambridge: exim/src/src/exim.c,v 1.49 2006/11/13 11:56:41 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("> "); fflush(stdout); }
1184 uschar buffer[1024];
1188 char *readline_line = NULL;
1189 if (fn_readline != NULL)
1191 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1192 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1193 p = US readline_line;
1198 /* readline() not in use */
1201 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1205 /* Handle the line */
1207 ss = p + (int)Ustrlen(p);
1208 while (ss > p && isspace(ss[-1])) ss--;
1212 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1215 yield = string_cat(yield, &size, &ptr, p, ss - p);
1218 if (fn_readline != NULL) free(readline_line);
1221 if (ss == p || yield[ptr-1] != '\\')
1229 if (yield == NULL) printf("\n");
1235 /*************************************************
1236 * Entry point and high-level code *
1237 *************************************************/
1239 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1240 the appropriate action. All the necessary functions are present in the one
1241 binary. I originally thought one should split it up, but it turns out that so
1242 much of the apparatus is needed in each chunk that one might as well just have
1243 it all available all the time, which then makes the coding easier as well.
1246 argc count of entries in argv
1247 argv argument strings, with argv[0] being the program name
1249 Returns: EXIT_SUCCESS if terminated successfully
1250 EXIT_FAILURE otherwise, except when a message has been sent
1251 to the sender, and -oee was given
1255 main(int argc, char **cargv)
1257 uschar **argv = USS cargv;
1258 int arg_receive_timeout = -1;
1259 int arg_smtp_receive_timeout = -1;
1260 int arg_error_handling = error_handling;
1261 int filter_sfd = -1;
1262 int filter_ufd = -1;
1265 int list_queue_option = 0;
1267 int msg_action_arg = -1;
1268 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1269 int queue_only_reason = 0;
1271 int perl_start_option = 0;
1273 int recipients_arg = argc;
1274 int sender_address_domain = 0;
1275 int test_retry_arg = -1;
1276 int test_rewrite_arg = -1;
1277 BOOL arg_queue_only = FALSE;
1278 BOOL bi_option = FALSE;
1279 BOOL checking = FALSE;
1280 BOOL count_queue = FALSE;
1281 BOOL expansion_test = FALSE;
1282 BOOL extract_recipients = FALSE;
1283 BOOL forced_delivery = FALSE;
1284 BOOL f_end_dot = FALSE;
1285 BOOL deliver_give_up = FALSE;
1286 BOOL list_queue = FALSE;
1287 BOOL list_options = FALSE;
1288 BOOL local_queue_only;
1290 BOOL one_msg_action = FALSE;
1291 BOOL queue_only_set = FALSE;
1292 BOOL receiving_message = TRUE;
1293 BOOL sender_ident_set = FALSE;
1295 BOOL removed_privilege = FALSE;
1296 BOOL verify_address_mode = FALSE;
1297 BOOL verify_as_sender = FALSE;
1298 BOOL version_printed = FALSE;
1299 uschar *alias_arg = NULL;
1300 uschar *called_as = US"";
1301 uschar *start_queue_run_id = NULL;
1302 uschar *stop_queue_run_id = NULL;
1303 uschar *expansion_test_message = NULL;
1304 uschar *ftest_domain = NULL;
1305 uschar *ftest_localpart = NULL;
1306 uschar *ftest_prefix = NULL;
1307 uschar *ftest_suffix = NULL;
1308 uschar *real_sender_address;
1309 uschar *originator_home = US"/";
1313 struct stat statbuf;
1314 pid_t passed_qr_pid = (pid_t)0;
1315 int passed_qr_pipe = -1;
1316 gid_t group_list[NGROUPS_MAX];
1318 /* Possible options for -R and -S */
1320 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1322 /* Need to define this in case we need to change the environment in order
1323 to get rid of a bogus time zone. We have to make it char rather than uschar
1324 because some OS define it in /usr/include/unistd.h. */
1326 extern char **environ;
1328 /* If the Exim user and/or group and/or the configuration file owner/group were
1329 defined by ref:name at build time, we must now find the actual uid/gid values.
1330 This is a feature to make the lives of binary distributors easier. */
1332 #ifdef EXIM_USERNAME
1333 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1335 exim_gid = pw->pw_gid;
1339 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1345 #ifdef EXIM_GROUPNAME
1346 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1348 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1354 #ifdef CONFIGURE_OWNERNAME
1355 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1357 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1358 CONFIGURE_OWNERNAME);
1363 #ifdef CONFIGURE_GROUPNAME
1364 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1366 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1367 CONFIGURE_GROUPNAME);
1372 /* In the Cygwin environment, some initialization needs doing. It is fudged
1373 in by means of this macro. */
1379 /* Check a field which is patched when we are running Exim within its
1380 testing harness; do a fast initial check, and then the whole thing. */
1382 running_in_test_harness =
1383 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1385 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1386 at the start of a program; however, it seems that some environments do not
1387 follow this. A "strange" locale can affect the formatting of timestamps, so we
1390 setlocale(LC_ALL, "C");
1392 /* Set up the default handler for timing using alarm(). */
1394 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1396 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1397 because store_malloc writes a log entry on failure. */
1399 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1400 if (log_buffer == NULL)
1402 fprintf(stderr, "exim: failed to get store for log buffer\n");
1406 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1407 NULL when the daemon is run and the file is closed. We have to use this
1408 indirection, because some systems don't allow writing to the variable "stderr".
1411 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1413 /* Arrange for the PCRE regex library to use our store functions. Note that
1414 the normal calls are actually macros that add additional arguments for
1415 debugging purposes so we have to assign specially constructed functions here.
1416 The default is to use store in the stacking pool, but this is overridden in the
1417 regex_must_compile() function. */
1419 pcre_malloc = function_store_get;
1420 pcre_free = function_dummy_free;
1422 /* Ensure there is a big buffer for temporary use in several places. It is put
1423 in malloc store so that it can be freed for enlargement if necessary. */
1425 big_buffer = store_malloc(big_buffer_size);
1427 /* Set up the handler for the data request signal, and set the initial
1428 descriptive text. */
1430 set_process_info("initializing");
1431 os_restarting_signal(SIGUSR1, usr1_handler);
1433 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1434 in the daemon code. For the rest of Exim's uses, we ignore it. */
1436 signal(SIGHUP, SIG_IGN);
1438 /* We don't want to die on pipe errors as the code is written to handle
1439 the write error instead. */
1441 signal(SIGPIPE, SIG_IGN);
1443 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1444 set to SIG_IGN. This causes subprocesses that complete before the parent
1445 process waits for them not to hang around, so when Exim calls wait(), nothing
1446 is there. The wait() code has been made robust against this, but let's ensure
1447 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1448 ending status. We use sigaction rather than plain signal() on those OS where
1449 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1450 problem on AIX with this.) */
1454 struct sigaction act;
1455 act.sa_handler = SIG_DFL;
1456 sigemptyset(&(act.sa_mask));
1458 sigaction(SIGCHLD, &act, NULL);
1461 signal(SIGCHLD, SIG_DFL);
1464 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1469 /* Set up the version number. Set up the leading 'E' for the external form of
1470 message ids, set the pointer to the internal form, and initialize it to
1471 indicate no message being processed. */
1474 message_id_option[0] = '-';
1475 message_id_external = message_id_option + 1;
1476 message_id_external[0] = 'E';
1477 message_id = message_id_external + 1;
1480 /* Set the umask to zero so that any files Exim creates using open() are
1481 created with the modes that it specifies. NOTE: Files created with fopen() have
1482 a problem, which was not recognized till rather late (February 2006). With this
1483 umask, such files will be world writeable. (They are all content scanning files
1484 in the spool directory, which isn't world-accessible, so this is not a
1485 disaster, but it's untidy.) I don't want to change this overall setting,
1486 however, because it will interact badly with the open() calls. Instead, there's
1487 now a function called modefopen() that fiddles with the umask while calling
1492 /* Precompile the regular expression for matching a message id. Keep this in
1493 step with the code that generates ids in the accept.c module. We need to do
1494 this here, because the -M options check their arguments for syntactic validity
1495 using mac_ismsgid, which uses this. */
1498 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1500 /* Precompile the regular expression that is used for matching an SMTP error
1501 code, possibly extended, at the start of an error message. */
1504 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1507 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1508 this seems to be a generally accepted convention, since one finds symbolic
1509 links called "mailq" in standard OS configurations. */
1511 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1512 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1515 receiving_message = FALSE;
1516 called_as = US"-mailq";
1519 /* If the program is called as "rmail" treat it as equivalent to
1520 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1521 i.e. preventing a single dot on a line from terminating the message, and
1522 returning with zero return code, even in cases of error (provided an error
1523 message has been sent). */
1525 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1526 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1529 called_as = US"-rmail";
1530 errors_sender_rc = EXIT_SUCCESS;
1533 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1534 this is a smail convention. */
1536 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1537 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1539 smtp_input = smtp_batched_input = TRUE;
1540 called_as = US"-rsmtp";
1543 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1544 this is a smail convention. */
1546 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1547 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1550 receiving_message = FALSE;
1551 called_as = US"-runq";
1554 /* If the program is called as "newaliases" treat it as equivalent to
1555 "exim -bi"; this is a sendmail convention. */
1557 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1558 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1561 receiving_message = FALSE;
1562 called_as = US"-newaliases";
1565 /* Save the original effective uid for a couple of uses later. It should
1566 normally be root, but in some esoteric environments it may not be. */
1568 original_euid = geteuid();
1570 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1571 to be the same as the real ones. This makes a difference only if Exim is setuid
1572 (or setgid) to something other than root, which could be the case in some
1573 special configurations. */
1575 real_uid = getuid();
1576 real_gid = getgid();
1578 if (real_uid == root_uid)
1584 /* If neither the original real uid nor the original euid was root, Exim is
1585 running in an unprivileged state. */
1587 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1589 /* If the first argument is --help, pretend there are no arguments. This will
1590 cause a brief message to be given. */
1592 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1594 /* Scan the program's arguments. Some can be dealt with right away; others are
1595 simply recorded for checking and handling afterwards. Do a high-level switch
1596 on the second character (the one after '-'), to save some effort. */
1598 for (i = 1; i < argc; i++)
1600 BOOL badarg = FALSE;
1601 uschar *arg = argv[i];
1605 /* An argument not starting with '-' is the start of a recipients list;
1606 break out of the options-scanning loop. */
1614 /* An option consistion of -- terminates the options */
1616 if (Ustrcmp(arg, "--") == 0)
1618 recipients_arg = i + 1;
1622 /* Handle flagged options */
1624 switchchar = arg[1];
1627 /* Make all -ex options synonymous with -oex arguments, since that
1628 is assumed by various callers. Also make -qR options synonymous with -R
1629 options, as that seems to be required as well. Allow for -qqR too, and
1630 the same for -S options. */
1632 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1633 Ustrncmp(arg+1, "qR", 2) == 0 ||
1634 Ustrncmp(arg+1, "qS", 2) == 0)
1636 switchchar = arg[2];
1639 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1641 switchchar = arg[3];
1643 queue_2stage = TRUE;
1646 /* Make -r synonymous with -f, since it is a documented alias */
1648 else if (arg[1] == 'r') switchchar = 'f';
1650 /* Make -ov synonymous with -v */
1652 else if (Ustrcmp(arg, "-ov") == 0)
1658 /* High-level switch on active initial letter */
1662 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1663 so has no need of it. */
1666 if (*argrest == 0) i++; /* Skip over the type */
1671 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1673 /* -bd: Run in daemon mode, awaiting SMTP connections.
1674 -bdf: Ditto, but in the foreground.
1677 if (*argrest == 'd')
1679 daemon_listen = TRUE;
1680 if (*(++argrest) == 'f') background_daemon = FALSE;
1681 else if (*argrest != 0) { badarg = TRUE; break; }
1684 /* -be: Run in expansion test mode
1685 -bem: Ditto, but read a message from a file first
1688 else if (*argrest == 'e')
1690 expansion_test = checking = TRUE;
1691 if (argrest[1] == 'm')
1693 if (++i >= argc) { badarg = TRUE; break; }
1694 expansion_test_message = argv[i];
1697 if (argrest[1] != 0) { badarg = TRUE; break; }
1700 /* -bF: Run system filter test */
1702 else if (*argrest == 'F')
1704 filter_test |= FTEST_SYSTEM;
1705 if (*(++argrest) != 0) { badarg = TRUE; break; }
1706 if (++i < argc) filter_test_sfile = argv[i]; else
1708 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1713 /* -bf: Run user filter test
1714 -bfd: Set domain for filter testing
1715 -bfl: Set local part for filter testing
1716 -bfp: Set prefix for filter testing
1717 -bfs: Set suffix for filter testing
1720 else if (*argrest == 'f')
1722 if (*(++argrest) == 0)
1724 filter_test |= FTEST_USER;
1725 if (++i < argc) filter_test_ufile = argv[i]; else
1727 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1735 fprintf(stderr, "exim: string expected after %s\n", arg);
1738 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1739 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1740 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1741 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1742 else { badarg = TRUE; break; }
1746 /* -bh: Host checking - an IP address must follow. */
1748 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1750 if (++i >= argc) { badarg = TRUE; break; }
1751 sender_host_address = argv[i];
1752 host_checking = checking = log_testing_mode = TRUE;
1753 host_checking_callout = argrest[1] == 'c';
1756 /* -bi: This option is used by sendmail to initialize *the* alias file,
1757 though it has the -oA option to specify a different file. Exim has no
1758 concept of *the* alias file, but since Sun's YP make script calls
1759 sendmail this way, some support must be provided. */
1761 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1763 /* -bm: Accept and deliver message - the default option. Reinstate
1764 receiving_message, which got turned off for all -b options. */
1766 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1768 /* -bnq: For locally originating messages, do not qualify unqualified
1769 addresses. In the envelope, this causes errors; in header lines they
1772 else if (Ustrcmp(argrest, "nq") == 0)
1774 allow_unqualified_sender = FALSE;
1775 allow_unqualified_recipient = FALSE;
1778 /* -bpxx: List the contents of the mail queue, in various forms. If
1779 the option is -bpc, just a queue count is needed. Otherwise, if the
1780 first letter after p is r, then order is random. */
1782 else if (*argrest == 'p')
1784 if (*(++argrest) == 'c')
1787 if (*(++argrest) != 0) badarg = TRUE;
1791 if (*argrest == 'r')
1793 list_queue_option = 8;
1796 else list_queue_option = 0;
1800 /* -bp: List the contents of the mail queue, top-level only */
1802 if (*argrest == 0) {}
1804 /* -bpu: List the contents of the mail queue, top-level undelivered */
1806 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1808 /* -bpa: List the contents of the mail queue, including all delivered */
1810 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1812 /* Unknown after -bp[r] */
1822 /* -bP: List the configuration variables given as the address list.
1823 Force -v, so configuration errors get displayed. */
1825 else if (Ustrcmp(argrest, "P") == 0)
1827 list_options = TRUE;
1828 debug_selector |= D_v;
1829 debug_file = stderr;
1832 /* -brt: Test retry configuration lookup */
1834 else if (Ustrcmp(argrest, "rt") == 0)
1836 test_retry_arg = i + 1;
1840 /* -brw: Test rewrite configuration */
1842 else if (Ustrcmp(argrest, "rw") == 0)
1844 test_rewrite_arg = i + 1;
1848 /* -bS: Read SMTP commands on standard input, but produce no replies -
1849 all errors are reported by sending messages. */
1851 else if (Ustrcmp(argrest, "S") == 0)
1852 smtp_input = smtp_batched_input = receiving_message = TRUE;
1854 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1855 on standard output. */
1857 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1859 /* -bt: address testing mode */
1861 else if (Ustrcmp(argrest, "t") == 0)
1862 address_test_mode = checking = log_testing_mode = TRUE;
1864 /* -bv: verify addresses */
1866 else if (Ustrcmp(argrest, "v") == 0)
1867 verify_address_mode = checking = log_testing_mode = TRUE;
1869 /* -bvs: verify sender addresses */
1871 else if (Ustrcmp(argrest, "vs") == 0)
1873 verify_address_mode = checking = log_testing_mode = TRUE;
1874 verify_as_sender = TRUE;
1877 /* -bV: Print version string and support details */
1879 else if (Ustrcmp(argrest, "V") == 0)
1881 printf("Exim version %s #%s built %s\n", version_string,
1882 version_cnumber, version_date);
1883 printf("%s\n", CS version_copyright);
1884 version_printed = TRUE;
1885 show_whats_supported(stdout);
1892 /* -C: change configuration file list; ignore if it isn't really
1893 a change! Enforce a prefix check if required. */
1898 if(++i < argc) argrest = argv[i]; else
1899 { badarg = TRUE; break; }
1901 if (Ustrcmp(config_main_filelist, argrest) != 0)
1903 #ifdef ALT_CONFIG_PREFIX
1905 int len = Ustrlen(ALT_CONFIG_PREFIX);
1906 uschar *list = argrest;
1908 while((filename = string_nextinlist(&list, &sep, big_buffer,
1909 big_buffer_size)) != NULL)
1911 if ((Ustrlen(filename) < len ||
1912 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1913 Ustrstr(filename, "/../") != NULL) &&
1914 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1916 fprintf(stderr, "-C Permission denied\n");
1922 config_main_filelist = argrest;
1923 config_changed = TRUE;
1928 /* -D: set up a macro definition */
1931 #ifdef DISABLE_D_OPTION
1932 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1937 macro_item *mlast = NULL;
1940 uschar *s = argrest;
1942 while (isspace(*s)) s++;
1944 if (*s < 'A' || *s > 'Z')
1946 fprintf(stderr, "exim: macro name set by -D must start with "
1947 "an upper case letter\n");
1951 while (isalnum(*s) || *s == '_')
1953 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1957 if (ptr == 0) { badarg = TRUE; break; }
1958 while (isspace(*s)) s++;
1961 if (*s++ != '=') { badarg = TRUE; break; }
1962 while (isspace(*s)) s++;
1965 for (m = macros; m != NULL; m = m->next)
1967 if (Ustrcmp(m->name, name) == 0)
1969 fprintf(stderr, "exim: duplicated -D in command line\n");
1975 m = store_get(sizeof(macro_item) + Ustrlen(name));
1977 m->command_line = TRUE;
1978 if (mlast == NULL) macros = m; else mlast->next = m;
1979 Ustrcpy(m->name, name);
1980 m->replacement = string_copy(s);
1982 if (clmacro_count >= MAX_CLMACROS)
1984 fprintf(stderr, "exim: too many -D options on command line\n");
1987 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1993 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1994 The latter is now a no-op, retained for compatibility only. If -dd is used,
1995 debugging subprocesses of the daemon is disabled. */
1998 if (Ustrcmp(argrest, "ropcr") == 0)
2000 /* drop_cr = TRUE; */
2003 /* Use an intermediate variable so that we don't set debugging while
2004 decoding the debugging bits. */
2008 unsigned int selector = D_default;
2011 if (*argrest == 'd')
2013 debug_daemon = TRUE;
2017 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2018 debug_options_count, US"debug");
2019 debug_selector = selector;
2024 /* -E: This is a local error message. This option is not intended for
2025 external use at all, but is not restricted to trusted callers because it
2026 does no harm (just suppresses certain error messages) and if Exim is run
2027 not setuid root it won't always be trusted when it generates error
2028 messages using this option. If there is a message id following -E, point
2029 message_reference at it, for logging. */
2032 local_error_message = TRUE;
2033 if (mac_ismsgid(argrest)) message_reference = argrest;
2037 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2038 option, so it looks as if historically the -oex options are also callable
2039 without the leading -o. So we have to accept them. Before the switch,
2040 anything starting -oe has been converted to -e. Exim does not support all
2041 of the sendmail error options. */
2044 if (Ustrcmp(argrest, "e") == 0)
2046 arg_error_handling = ERRORS_SENDER;
2047 errors_sender_rc = EXIT_SUCCESS;
2049 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2050 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2051 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2052 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2057 /* -F: Set sender's full name, used instead of the gecos entry from
2058 the password file. Since users can usually alter their gecos entries,
2059 there's no security involved in using this instead. The data can follow
2060 the -F or be in the next argument. */
2065 if(++i < argc) argrest = argv[i]; else
2066 { badarg = TRUE; break; }
2068 originator_name = argrest;
2069 sender_name_forced = TRUE;
2073 /* -f: Set sender's address - this value is only actually used if Exim is
2074 run by a trusted user, or if untrusted_set_sender is set and matches the
2075 address, except that the null address can always be set by any user. The
2076 test for this happens later, when the value given here is ignored when not
2077 permitted. For an untrusted user, the actual sender is still put in Sender:
2078 if it doesn't match the From: header (unless no_local_from_check is set).
2079 The data can follow the -f or be in the next argument. The -r switch is an
2080 obsolete form of -f but since there appear to be programs out there that
2081 use anything that sendmail has ever supported, better accept it - the
2082 synonymizing is done before the switch above.
2084 At this stage, we must allow domain literal addresses, because we don't
2085 know what the setting of allow_domain_literals is yet. Ditto for trailing
2086 dots and strip_trailing_dot. */
2094 if (i+1 < argc) argrest = argv[++i]; else
2095 { badarg = TRUE; break; }
2099 sender_address = string_sprintf(""); /* Ensure writeable memory */
2103 uschar *temp = argrest + Ustrlen(argrest) - 1;
2104 while (temp >= argrest && isspace(*temp)) temp--;
2105 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2106 allow_domain_literals = TRUE;
2107 strip_trailing_dot = TRUE;
2108 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2109 &sender_address_domain, TRUE);
2110 allow_domain_literals = FALSE;
2111 strip_trailing_dot = FALSE;
2112 if (sender_address == NULL)
2114 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2115 return EXIT_FAILURE;
2118 sender_address_forced = TRUE;
2122 /* This is some Sendmail thing which can be ignored */
2127 /* -h: Set the hop count for an incoming message. Exim does not currently
2128 support this; it always computes it by counting the Received: headers.
2129 To put it in will require a change to the spool header file format. */
2134 if(++i < argc) argrest = argv[i]; else
2135 { badarg = TRUE; break; }
2137 if (!isdigit(*argrest)) badarg = TRUE;
2141 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2142 not to be documented for sendmail but mailx (at least) uses it) */
2145 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2150 receiving_message = FALSE;
2152 /* -MC: continue delivery of another message via an existing open
2153 file descriptor. This option is used for an internal call by the
2154 smtp transport when there is a pending message waiting to go to an
2155 address to which it has got a connection. Five subsequent arguments are
2156 required: transport name, host name, IP address, sequence number, and
2157 message_id. Transports may decline to create new processes if the sequence
2158 number gets too big. The channel is stdin. This (-MC) must be the last
2159 argument. There's a subsequent check that the real-uid is privileged.
2161 If we are running in the test harness. delay for a bit, to let the process
2162 that set this one up complete. This makes for repeatability of the logging,
2165 if (Ustrcmp(argrest, "C") == 0)
2169 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2170 return EXIT_FAILURE;
2173 if (msg_action_arg >= 0)
2175 fprintf(stderr, "exim: incompatible arguments\n");
2176 return EXIT_FAILURE;
2179 continue_transport = argv[++i];
2180 continue_hostname = argv[++i];
2181 continue_host_address = argv[++i];
2182 continue_sequence = Uatoi(argv[++i]);
2183 msg_action = MSG_DELIVER;
2184 msg_action_arg = ++i;
2185 forced_delivery = TRUE;
2186 queue_run_pid = passed_qr_pid;
2187 queue_run_pipe = passed_qr_pipe;
2189 if (!mac_ismsgid(argv[i]))
2191 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2193 return EXIT_FAILURE;
2196 if (running_in_test_harness) millisleep(500);
2200 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2201 precedes -MC (see above). The flag indicates that the host to which
2202 Exim is connected has accepted an AUTH sequence. */
2204 else if (Ustrcmp(argrest, "CA") == 0)
2206 smtp_authenticated = TRUE;
2210 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2211 it preceded -MC (see above) */
2213 else if (Ustrcmp(argrest, "CP") == 0)
2215 smtp_use_pipelining = TRUE;
2219 /* -MCQ: pass on the pid of the queue-running process that started
2220 this chain of deliveries and the fd of its synchronizing pipe; this
2221 is useful only when it precedes -MC (see above) */
2223 else if (Ustrcmp(argrest, "CQ") == 0)
2225 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2227 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2232 /* -MCS: set the smtp_use_size flag; this is useful only when it
2233 precedes -MC (see above) */
2235 else if (Ustrcmp(argrest, "CS") == 0)
2237 smtp_use_size = TRUE;
2241 /* -MCT: set the tls_offered flag; this is useful only when it
2242 precedes -MC (see above). The flag indicates that the host to which
2243 Exim is connected has offered TLS support. */
2246 else if (Ustrcmp(argrest, "CT") == 0)
2253 /* -M[x]: various operations on the following list of message ids:
2254 -M deliver the messages, ignoring next retry times and thawing
2255 -Mc deliver the messages, checking next retry times, no thawing
2256 -Mf freeze the messages
2257 -Mg give up on the messages
2258 -Mt thaw the messages
2259 -Mrm remove the messages
2260 In the above cases, this must be the last option. There are also the
2261 following options which are followed by a single message id, and which
2262 act on that message. Some of them use the "recipient" addresses as well.
2263 -Mar add recipient(s)
2264 -Mmad mark all recipients delivered
2265 -Mmd mark recipients(s) delivered
2267 -Mset load a message for use with -be
2273 else if (*argrest == 0)
2275 msg_action = MSG_DELIVER;
2276 forced_delivery = deliver_force_thaw = TRUE;
2278 else if (Ustrcmp(argrest, "ar") == 0)
2280 msg_action = MSG_ADD_RECIPIENT;
2281 one_msg_action = TRUE;
2283 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2284 else if (Ustrcmp(argrest, "es") == 0)
2286 msg_action = MSG_EDIT_SENDER;
2287 one_msg_action = TRUE;
2289 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2290 else if (Ustrcmp(argrest, "g") == 0)
2292 msg_action = MSG_DELIVER;
2293 deliver_give_up = TRUE;
2295 else if (Ustrcmp(argrest, "mad") == 0)
2297 msg_action = MSG_MARK_ALL_DELIVERED;
2299 else if (Ustrcmp(argrest, "md") == 0)
2301 msg_action = MSG_MARK_DELIVERED;
2302 one_msg_action = TRUE;
2304 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2305 else if (Ustrcmp(argrest, "set") == 0)
2307 msg_action = MSG_LOAD;
2308 one_msg_action = TRUE;
2310 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2311 else if (Ustrcmp(argrest, "vb") == 0)
2313 msg_action = MSG_SHOW_BODY;
2314 one_msg_action = TRUE;
2316 else if (Ustrcmp(argrest, "vh") == 0)
2318 msg_action = MSG_SHOW_HEADER;
2319 one_msg_action = TRUE;
2321 else if (Ustrcmp(argrest, "vl") == 0)
2323 msg_action = MSG_SHOW_LOG;
2324 one_msg_action = TRUE;
2326 else { badarg = TRUE; break; }
2328 /* All the -Mxx options require at least one message id. */
2330 msg_action_arg = i + 1;
2331 if (msg_action_arg >= argc)
2333 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2334 return EXIT_FAILURE;
2337 /* Some require only message ids to follow */
2339 if (!one_msg_action)
2342 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2344 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2346 return EXIT_FAILURE;
2348 goto END_ARG; /* Remaining args are ids */
2351 /* Others require only one message id, possibly followed by addresses,
2352 which will be handled as normal arguments. */
2356 if (!mac_ismsgid(argv[msg_action_arg]))
2358 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2359 argv[msg_action_arg], arg);
2360 return EXIT_FAILURE;
2367 /* Some programs seem to call the -om option without the leading o;
2368 for sendmail it askes for "me too". Exim always does this. */
2371 if (*argrest != 0) badarg = TRUE;
2375 /* -N: don't do delivery - a debugging option that stops transports doing
2376 their thing. It implies debugging at the D_v level. */
2381 dont_deliver = TRUE;
2382 debug_selector |= D_v;
2383 debug_file = stderr;
2389 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2395 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2396 option to the specified value. This form uses long names. We need to handle
2397 -O option=value and -Ooption=value. */
2404 fprintf(stderr, "exim: string expected after -O\n");
2412 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2415 if (*argrest == 'A')
2417 alias_arg = argrest + 1;
2418 if (alias_arg[0] == 0)
2420 if (i+1 < argc) alias_arg = argv[++i]; else
2422 fprintf(stderr, "exim: string expected after -oA\n");
2428 /* -oB: Set a connection message max value for remote deliveries */
2430 else if (*argrest == 'B')
2432 uschar *p = argrest + 1;
2435 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2437 connection_max_messages = 1;
2446 fprintf(stderr, "exim: number expected after -oB\n");
2449 connection_max_messages = Uatoi(p);
2453 /* -odb: background delivery */
2455 else if (Ustrcmp(argrest, "db") == 0)
2457 synchronous_delivery = FALSE;
2458 arg_queue_only = FALSE;
2459 queue_only_set = TRUE;
2462 /* -odf: foreground delivery (smail-compatible option); same effect as
2463 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2466 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2468 synchronous_delivery = TRUE;
2469 arg_queue_only = FALSE;
2470 queue_only_set = TRUE;
2473 /* -odq: queue only */
2475 else if (Ustrcmp(argrest, "dq") == 0)
2477 synchronous_delivery = FALSE;
2478 arg_queue_only = TRUE;
2479 queue_only_set = TRUE;
2482 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2483 but no remote delivery */
2485 else if (Ustrcmp(argrest, "dqs") == 0)
2488 arg_queue_only = FALSE;
2489 queue_only_set = TRUE;
2492 /* -oex: Sendmail error flags. As these are also accepted without the
2493 leading -o prefix, for compatibility with vacation and other callers,
2494 they are handled with -e above. */
2496 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2497 -oitrue: Another sendmail syntax for the same */
2499 else if (Ustrcmp(argrest, "i") == 0 ||
2500 Ustrcmp(argrest, "itrue") == 0)
2503 /* -oM*: Set various characteristics for an incoming message; actually
2504 acted on for trusted callers only. */
2506 else if (*argrest == 'M')
2510 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2514 /* -oMa: Set sender host address */
2516 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2518 /* -oMaa: Set authenticator name */
2520 else if (Ustrcmp(argrest, "Maa") == 0)
2521 sender_host_authenticated = argv[++i];
2523 /* -oMas: setting authenticated sender */
2525 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2527 /* -oMai: setting authenticated id */
2529 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2531 /* -oMi: Set incoming interface address */
2533 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2535 /* -oMr: Received protocol */
2537 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2539 /* -oMs: Set sender host name */
2541 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2543 /* -oMt: Set sender ident */
2545 else if (Ustrcmp(argrest, "Mt") == 0)
2547 sender_ident_set = TRUE;
2548 sender_ident = argv[++i];
2551 /* Else a bad argument */
2560 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2561 seem to call this as -m (undocumented), so that is also accepted (see
2564 else if (Ustrcmp(argrest, "m") == 0) {}
2566 /* -oo: An ancient flag for old-style addresses which still seems to
2567 crop up in some calls (see in SCO). */
2569 else if (Ustrcmp(argrest, "o") == 0) {}
2571 /* -oP <name>: set pid file path for daemon */
2573 else if (Ustrcmp(argrest, "P") == 0)
2574 override_pid_file_path = argv[++i];
2576 /* -or <n>: set timeout for non-SMTP acceptance
2577 -os <n>: set timeout for SMTP acceptance */
2579 else if (*argrest == 'r' || *argrest == 's')
2581 int *tp = (*argrest == 'r')?
2582 &arg_receive_timeout : &arg_smtp_receive_timeout;
2583 if (argrest[1] == 0)
2585 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2587 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2590 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2595 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2597 else if (Ustrcmp(argrest, "X") == 0)
2598 override_local_interfaces = argv[++i];
2600 /* Unknown -o argument */
2606 /* -ps: force Perl startup; -pd force delayed Perl startup */
2610 if (*argrest == 's' && argrest[1] == 0)
2612 perl_start_option = 1;
2615 if (*argrest == 'd' && argrest[1] == 0)
2617 perl_start_option = -1;
2622 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2623 which sets the host protocol and host name */
2627 if (i+1 < argc) argrest = argv[++i]; else
2628 { badarg = TRUE; break; }
2633 uschar *hn = Ustrchr(argrest, ':');
2636 received_protocol = argrest;
2640 received_protocol = string_copyn(argrest, hn - argrest);
2641 sender_host_name = hn + 1;
2648 receiving_message = FALSE;
2649 if (queue_interval >= 0)
2651 fprintf(stderr, "exim: -q specified more than once\n");
2655 /* -qq...: Do queue runs in a 2-stage manner */
2657 if (*argrest == 'q')
2659 queue_2stage = TRUE;
2663 /* -qi...: Do only first (initial) deliveries */
2665 if (*argrest == 'i')
2667 queue_run_first_delivery = TRUE;
2671 /* -qf...: Run the queue, forcing deliveries
2672 -qff..: Ditto, forcing thawing as well */
2674 if (*argrest == 'f')
2676 queue_run_force = TRUE;
2677 if (*(++argrest) == 'f')
2679 deliver_force_thaw = TRUE;
2684 /* -q[f][f]l...: Run the queue only on local deliveries */
2686 if (*argrest == 'l')
2688 queue_run_local = TRUE;
2692 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2693 optionally starting from a given message id. */
2695 if (*argrest == 0 &&
2696 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2699 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2700 start_queue_run_id = argv[++i];
2701 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2702 stop_queue_run_id = argv[++i];
2705 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2706 optionally local only. */
2711 queue_interval = readconf_readtime(argrest, 0, FALSE);
2713 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2714 if (queue_interval <= 0)
2716 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2723 case 'R': /* Synonymous with -qR... */
2724 receiving_message = FALSE;
2726 /* -Rf: As -R (below) but force all deliveries,
2727 -Rff: Ditto, but also thaw all frozen messages,
2728 -Rr: String is regex
2729 -Rrf: Regex and force
2730 -Rrff: Regex and force and thaw
2732 in all cases provided there are no further characters in this
2738 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2740 if (Ustrcmp(argrest, rsopts[i]) == 0)
2742 if (i != 2) queue_run_force = TRUE;
2743 if (i >= 2) deliver_selectstring_regex = TRUE;
2744 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2745 argrest += Ustrlen(rsopts[i]);
2750 /* -R: Set string to match in addresses for forced queue run to
2751 pick out particular messages. */
2755 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2757 fprintf(stderr, "exim: string expected after -R\n");
2761 else deliver_selectstring = argrest;
2765 /* -r: an obsolete synonym for -f (see above) */
2768 /* -S: Like -R but works on sender. */
2770 case 'S': /* Synonymous with -qS... */
2771 receiving_message = FALSE;
2773 /* -Sf: As -S (below) but force all deliveries,
2774 -Sff: Ditto, but also thaw all frozen messages,
2775 -Sr: String is regex
2776 -Srf: Regex and force
2777 -Srff: Regex and force and thaw
2779 in all cases provided there are no further characters in this
2785 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2787 if (Ustrcmp(argrest, rsopts[i]) == 0)
2789 if (i != 2) queue_run_force = TRUE;
2790 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2791 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2792 argrest += Ustrlen(rsopts[i]);
2797 /* -S: Set string to match in addresses for forced queue run to
2798 pick out particular messages. */
2802 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2804 fprintf(stderr, "exim: string expected after -S\n");
2808 else deliver_selectstring_sender = argrest;
2811 /* -Tqt is an option that is exclusively for use by the testing suite.
2812 It is not recognized in other circumstances. It allows for the setting up
2813 of explicit "queue times" so that various warning/retry things can be
2814 tested. Otherwise variability of clock ticks etc. cause problems. */
2817 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2818 fudged_queue_times = argv[++i];
2823 /* -t: Set flag to extract recipients from body of message. */
2826 if (*argrest == 0) extract_recipients = TRUE;
2828 /* -ti: Set flag to extract recipients from body of message, and also
2829 specify that dot does not end the message. */
2831 else if (Ustrcmp(argrest, "i") == 0)
2833 extract_recipients = TRUE;
2837 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2840 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2847 /* -U: This means "initial user submission" in sendmail, apparently. The
2848 doc claims that in future sendmail may refuse syntactically invalid
2849 messages instead of fixing them. For the moment, we just ignore it. */
2855 /* -v: verify things - this is a very low-level debugging */
2860 debug_selector |= D_v;
2861 debug_file = stderr;
2867 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2869 The -x flag tells the sendmail command that mail from a local
2870 mail program has National Language Support (NLS) extended characters
2871 in the body of the mail item. The sendmail command can send mail with
2872 extended NLS characters across networks that normally corrupts these
2875 As Exim is 8-bit clean, it just ignores this flag. */
2878 if (*argrest != 0) badarg = TRUE;
2881 /* All other initial characters are errors */
2886 } /* End of high-level switch statement */
2888 /* Failed to recognize the option, or syntax error */
2892 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2893 "option %s\n", arg);
2899 /* If -R or -S have been specified without -q, assume a single queue run. */
2901 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2902 queue_interval < 0) queue_interval = 0;
2905 /* Arguments have been processed. Check for incompatibilities. */
2909 (smtp_input || extract_recipients || recipients_arg < argc) &&
2910 (daemon_listen || queue_interval >= 0 || bi_option ||
2911 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2912 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2915 msg_action_arg > 0 &&
2916 (daemon_listen || queue_interval >= 0 || list_options ||
2917 (checking && msg_action != MSG_LOAD) ||
2918 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2921 (daemon_listen || queue_interval >= 0) &&
2922 (sender_address != NULL || list_options || list_queue || checking ||
2926 daemon_listen && queue_interval == 0
2930 (checking || smtp_input || extract_recipients ||
2931 filter_test != FTEST_NONE || bi_option)
2934 verify_address_mode &&
2935 (address_test_mode || smtp_input || extract_recipients ||
2936 filter_test != FTEST_NONE || bi_option)
2939 address_test_mode && (smtp_input || extract_recipients ||
2940 filter_test != FTEST_NONE || bi_option)
2943 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2947 deliver_selectstring != NULL && queue_interval < 0
2950 msg_action == MSG_LOAD &&
2951 (!expansion_test || expansion_test_message != NULL)
2955 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2959 /* If debugging is set up, set the file and the file descriptor to pass on to
2960 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2961 to run in the foreground. */
2963 if (debug_selector != 0)
2965 debug_file = stderr;
2966 debug_fd = fileno(debug_file);
2967 background_daemon = FALSE;
2968 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2969 if (debug_selector != D_v) /* -v only doesn't show this */
2971 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2972 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2974 show_whats_supported(stderr);
2978 /* When started with root privilege, ensure that the limits on the number of
2979 open files and the number of processes (where that is accessible) are
2980 sufficiently large, or are unset, in case Exim has been called from an
2981 environment where the limits are screwed down. Not all OS have the ability to
2982 change some of these limits. */
2986 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2992 #ifdef RLIMIT_NOFILE
2993 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2995 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2997 rlp.rlim_cur = rlp.rlim_max = 0;
3000 /* I originally chose 1000 as a nice big number that was unlikely to
3001 be exceeded. It turns out that some older OS have a fixed upper limit of
3004 if (rlp.rlim_cur < 1000)
3006 rlp.rlim_cur = rlp.rlim_max = 1000;
3007 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3009 rlp.rlim_cur = rlp.rlim_max = 256;
3010 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3011 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3018 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3020 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3022 rlp.rlim_cur = rlp.rlim_max = 0;
3025 #ifdef RLIM_INFINITY
3026 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3028 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3030 if (rlp.rlim_cur < 1000)
3032 rlp.rlim_cur = rlp.rlim_max = 1000;
3034 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3035 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3041 /* Exim is normally entered as root (but some special configurations are
3042 possible that don't do this). However, it always spins off sub-processes that
3043 set their uid and gid as required for local delivery. We don't want to pass on
3044 any extra groups that root may belong to, so we want to get rid of them all at
3047 We need to obey setgroups() at this stage, before possibly giving up root
3048 privilege for a changed configuration file, but later on we might need to
3049 check on the additional groups for the admin user privilege - can't do that
3050 till after reading the config, which might specify the exim gid. Therefore,
3051 save the group list here first. */
3053 group_count = getgroups(NGROUPS_MAX, group_list);
3055 /* There is a fundamental difference in some BSD systems in the matter of
3056 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3057 known not to be different. On the "different" systems there is a single group
3058 list, and the first entry in it is the current group. On all other versions of
3059 Unix there is a supplementary group list, which is in *addition* to the current
3060 group. Consequently, to get rid of all extraneous groups on a "standard" system
3061 you pass over 0 groups to setgroups(), while on a "different" system you pass
3062 over a single group - the current group, which is always the first group in the
3063 list. Calling setgroups() with zero groups on a "different" system results in
3064 an error return. The following code should cope with both types of system.
3066 However, if this process isn't running as root, setgroups() can't be used
3067 since you have to be root to run it, even if throwing away groups. Not being
3068 root here happens only in some unusual configurations. We just ignore the
3071 if (setgroups(0, NULL) != 0)
3073 if (setgroups(1, group_list) != 0 && !unprivileged)
3075 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3080 /* If the configuration file name has been altered by an argument on the
3081 command line (either a new file name or a macro definition) and the caller is
3082 not root or the exim user, or if this is a filter testing run, remove any
3083 setuid privilege the program has, and run as the underlying user.
3085 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3086 severely restricts the use of -C for some purposes.
3088 Otherwise, set the real ids to the effective values (should be root unless run
3089 from inetd, which it can either be root or the exim uid, if one is configured).
3091 There is a private mechanism for bypassing some of this, in order to make it
3092 possible to test lots of configurations automatically, without having either to
3093 recompile each time, or to patch in an actual configuration file name and other
3094 values (such as the path name). If running in the test harness, pretend that
3095 configuration file changes and macro definitions haven't happened. */
3098 (config_changed || macros != NULL) && /* Config changed, and */
3099 real_uid != root_uid && /* Not root, and */
3100 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3101 real_uid != exim_uid && /* Not exim, and */
3103 !running_in_test_harness /* Not fudged */
3105 expansion_test /* expansion testing */
3107 filter_test != FTEST_NONE) /* Filter testing */
3109 setgroups(group_count, group_list);
3110 exim_setugid(real_uid, real_gid, FALSE,
3111 US"-C, -D, -be or -bf forces real uid");
3112 removed_privilege = TRUE;
3114 /* In the normal case when Exim is called like this, stderr is available
3115 and should be used for any logging information because attempts to write
3116 to the log will usually fail. To arrange this, we unset really_exim. However,
3117 if no stderr is available there is no point - we might as well have a go
3118 at the log (if it fails, syslog will be written). */
3120 if (log_stderr != NULL) really_exim = FALSE;
3123 /* Privilege is to be retained for the moment. It may be dropped later,
3124 depending on the job that this Exim process has been asked to do. For now, set
3125 the real uid to the effective so that subsequent re-execs of Exim are done by a
3128 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3130 /* If testing a filter, open the file(s) now, before wasting time doing other
3131 setups and reading the message. */
3133 if ((filter_test & FTEST_SYSTEM) != 0)
3135 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3138 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3140 return EXIT_FAILURE;
3144 if ((filter_test & FTEST_USER) != 0)
3146 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3149 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3151 return EXIT_FAILURE;
3155 /* Read the main runtime configuration data; this gives up if there
3156 is a failure. It leaves the configuration file open so that the subsequent
3157 configuration data for delivery can be read if needed. */
3161 /* Handle the decoding of logging options. */
3163 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3164 log_options, log_options_count, US"log");
3168 debug_printf("configuration file is %s\n", config_main_filename);
3169 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3170 log_extra_selector);
3173 /* If domain literals are not allowed, check the sender address that was
3174 supplied with -f. Ditto for a stripped trailing dot. */
3176 if (sender_address != NULL)
3178 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3180 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3181 "allowed\n", sender_address);
3182 return EXIT_FAILURE;
3184 if (f_end_dot && !strip_trailing_dot)
3186 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3187 "(trailing dot not allowed)\n", sender_address);
3188 return EXIT_FAILURE;
3192 /* Paranoia check of maximum lengths of certain strings. There is a check
3193 on the length of the log file path in log.c, which will come into effect
3194 if there are any calls to write the log earlier than this. However, if we
3195 get this far but the string is very long, it is better to stop now than to
3196 carry on and (e.g.) receive a message and then have to collapse. The call to
3197 log_write() from here will cause the ultimate panic collapse if the complete
3198 file name exceeds the buffer length. */
3200 if (Ustrlen(log_file_path) > 200)
3201 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3202 "log_file_path is longer than 200 chars: aborting");
3204 if (Ustrlen(pid_file_path) > 200)
3205 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3206 "pid_file_path is longer than 200 chars: aborting");
3208 if (Ustrlen(spool_directory) > 200)
3209 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3210 "spool_directory is longer than 200 chars: aborting");
3212 /* Length check on the process name given to syslog for its TAG field,
3213 which is only permitted to be 32 characters or less. See RFC 3164. */
3215 if (Ustrlen(syslog_processname) > 32)
3216 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3217 "syslog_processname is longer than 32 chars: aborting");
3219 /* In some operating systems, the environment variable TMPDIR controls where
3220 temporary files are created; Exim doesn't use these (apart from when delivering
3221 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3222 If TMPDIR is found in the environment, reset it to the value defined in the
3223 TMPDIR macro, if this macro is defined. */
3228 for (p = USS environ; *p != NULL; p++)
3230 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3231 Ustrcmp(*p+7, TMPDIR) != 0)
3233 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3234 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3236 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3242 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3243 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3244 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3245 called by a user who has set the TZ variable. This then affects the timestamps
3246 in log files and in Received: headers, and any created Date: header lines. The
3247 required timezone is settable in the configuration file, so nothing can be done
3248 about this earlier - but hopefully nothing will normally be logged earlier than
3249 this. We have to make a new environment if TZ is wrong, but don't bother if
3250 timestamps_utc is set, because then all times are in UTC anyway. */
3252 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3254 timestamps_utc = TRUE;
3258 uschar *envtz = US getenv("TZ");
3259 if ((envtz == NULL && timezone_string != NULL) ||
3261 (timezone_string == NULL ||
3262 Ustrcmp(timezone_string, envtz) != 0)))
3264 uschar **p = USS environ;
3268 while (*p++ != NULL) count++;
3269 if (envtz == NULL) count++;
3270 newp = new = malloc(sizeof(uschar *) * (count + 1));
3271 for (p = USS environ; *p != NULL; p++)
3273 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3276 if (timezone_string != NULL)
3278 *newp = malloc(Ustrlen(timezone_string) + 4);
3279 sprintf(CS *newp++, "TZ=%s", timezone_string);
3284 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3285 tod_stamp(tod_log));
3289 /* Handle the case when we have removed the setuid privilege because of -C or
3290 -D. This means that the caller of Exim was not root, and, provided that
3291 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3294 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3295 were running as the exim user defined in the configuration file (different to
3296 the one in the binary). The sysadmin may expect this case to retain privilege
3297 because "the binary was called by the Exim user", but it hasn't, because of the
3298 order in which it handles this stuff. There are two possibilities:
3300 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3301 to do message deliveries. Thus, the fact that it is running as a
3302 non-privileged user is plausible, and might be wanted in some special
3303 configurations. However, really_exim will have been set false when
3304 privilege was dropped, to stop Exim trying to write to its normal log
3305 files. Therefore, re-enable normal log processing, assuming the sysadmin
3306 has set up the log directory correctly.
3308 (2) If deliver_drop_privilege is not set, the configuration won't work as
3309 apparently intended, and so we log a panic message. In order to retain
3310 root for -C or -D, the caller must either be root or the Exim user
3311 defined in the binary (when deliver_drop_ privilege is false).
3313 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3314 built-in exim user or one defined in the configuration. In either event,
3315 re-enable log processing, assuming the sysadmin knows what they are doing. */
3317 if (removed_privilege && (config_changed || macros != NULL) &&
3318 real_uid == exim_uid)
3320 #ifdef ALT_CONFIG_ROOT_ONLY
3321 really_exim = TRUE; /* let logging work normally */
3324 if (deliver_drop_privilege)
3325 really_exim = TRUE; /* let logging work normally */
3327 log_write(0, LOG_MAIN|LOG_PANIC,
3328 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3329 (int)exim_uid, config_changed? "-C" : "-D");
3333 /* Start up Perl interpreter if Perl support is configured and there is a
3334 perl_startup option, and the configuration or the command line specifies
3335 initializing starting. Note that the global variables are actually called
3336 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3339 if (perl_start_option != 0)
3340 opt_perl_at_start = (perl_start_option > 0);
3341 if (opt_perl_at_start && opt_perl_startup != NULL)
3344 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3345 errstr = init_perl(opt_perl_startup);
3348 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3349 return EXIT_FAILURE;
3351 opt_perl_started = TRUE;
3353 #endif /* EXIM_PERL */
3355 /* Log the arguments of the call if the configuration file said so. This is
3356 a debugging feature for finding out what arguments certain MUAs actually use.
3357 Don't attempt it if logging is disabled, or if listing variables or if
3358 verifying/testing addresses or expansions. */
3360 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3361 && really_exim && !list_options && !checking)
3364 uschar *p = big_buffer;
3366 (void)getcwd(CS p+4, big_buffer_size - 4);
3368 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3370 for (i = 0; i < argc; i++)
3372 int len = Ustrlen(argv[i]);
3375 if (p + len + 8 >= big_buffer + big_buffer_size)
3378 log_write(0, LOG_MAIN, "%s", big_buffer);
3379 Ustrcpy(big_buffer, "...");
3382 printing = string_printing(argv[i]);
3383 if (printing[0] == 0) quote = US"\""; else
3385 uschar *pp = printing;
3387 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3389 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3390 (p - big_buffer) - 4), printing, quote);
3394 if ((log_extra_selector & LX_arguments) != 0)
3395 log_write(0, LOG_MAIN, "%s", big_buffer);
3397 debug_printf("%s\n", big_buffer);
3400 /* Set the working directory to be the top-level spool directory. We don't rely
3401 on this in the code, which always uses fully qualified names, but it's useful
3402 for core dumps etc. Don't complain if it fails - the spool directory might not
3403 be generally accessible and calls with the -C option (and others) have lost
3404 privilege by now. Before the chdir, we try to ensure that the directory exists.
3407 if (Uchdir(spool_directory) != 0)
3409 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3410 (void)Uchdir(spool_directory);
3413 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3414 alias file. Exim doesn't have such a concept, but this call is screwed into
3415 Sun's YP makefiles. Handle this by calling a configured script, as the real
3416 user who called Exim. The -oA option can be used to pass an argument to the
3421 (void)fclose(config_file);
3422 if (bi_command != NULL)
3426 argv[i++] = bi_command;
3427 if (alias_arg != NULL) argv[i++] = alias_arg;
3430 setgroups(group_count, group_list);
3431 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3433 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3434 (argv[1] == NULL)? US"" : argv[1]);
3436 execv(CS argv[0], (char *const *)argv);
3437 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3442 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3447 /* If an action on specific messages is requested, or if a daemon or queue
3448 runner is being started, we need to know if Exim was called by an admin user.
3449 This is the case if the real user is root or exim, or if the real group is
3450 exim, or if one of the supplementary groups is exim or a group listed in
3451 admin_groups. We don't fail all message actions immediately if not admin_user,
3452 since some actions can be performed by non-admin users. Instead, set admin_user
3453 for later interrogation. */
3455 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3461 for (i = 0; i < group_count; i++)
3463 if (group_list[i] == exim_gid) admin_user = TRUE;
3464 else if (admin_groups != NULL)
3466 for (j = 1; j <= (int)(admin_groups[0]); j++)
3467 if (admin_groups[j] == group_list[i])
3468 { admin_user = TRUE; break; }
3470 if (admin_user) break;
3474 /* Another group of privileged users are the trusted users. These are root,
3475 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3476 are permitted to specify sender_addresses with -f on the command line, and
3477 other message parameters as well. */
3479 if (real_uid == root_uid || real_uid == exim_uid)
3480 trusted_caller = TRUE;
3485 if (trusted_users != NULL)
3487 for (i = 1; i <= (int)(trusted_users[0]); i++)
3488 if (trusted_users[i] == real_uid)
3489 { trusted_caller = TRUE; break; }
3492 if (!trusted_caller && trusted_groups != NULL)
3494 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3496 if (trusted_groups[i] == real_gid)
3497 trusted_caller = TRUE;
3498 else for (j = 0; j < group_count; j++)
3500 if (trusted_groups[i] == group_list[j])
3501 { trusted_caller = TRUE; break; }
3503 if (trusted_caller) break;
3508 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3509 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3511 /* Only an admin user may start the daemon or force a queue run in the default
3512 configuration, but the queue run restriction can be relaxed. Only an admin
3513 user may request that a message be returned to its sender forthwith. Only an
3514 admin user may specify a debug level greater than D_v (because it might show
3515 passwords, etc. in lookup queries). Only an admin user may request a queue
3520 BOOL debugset = (debug_selector & ~D_v) != 0;
3521 if (deliver_give_up || daemon_listen ||
3522 (count_queue && queue_list_requires_admin) ||
3523 (list_queue && queue_list_requires_admin) ||
3524 (queue_interval >= 0 && prod_requires_admin) ||
3525 (debugset && !running_in_test_harness))
3527 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3532 /* If the real user is not root or the exim uid, the argument for passing
3533 in an open TCP/IP connection for another message is not permitted, nor is
3534 running with the -N option for any delivery action, unless this call to exim is
3535 one that supplied an input message, or we are using a patched exim for
3536 regression testing. */
3538 if (real_uid != root_uid && real_uid != exim_uid &&
3539 (continue_hostname != NULL ||
3541 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3542 )) && !running_in_test_harness)
3544 fprintf(stderr, "exim: Permission denied\n");
3545 return EXIT_FAILURE;
3548 /* If the caller is not trusted, certain arguments are ignored when running for
3549 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3550 Note that authority for performing certain actions on messages is tested in the
3551 queue_action() function. */
3553 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3555 sender_host_name = sender_host_address = interface_address =
3556 sender_ident = received_protocol = NULL;
3557 sender_host_port = interface_port = 0;
3558 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3561 /* If a sender host address is set, extract the optional port number off the
3562 end of it and check its syntax. Do the same thing for the interface address.
3563 Exim exits if the syntax is bad. */
3567 if (sender_host_address != NULL)
3568 sender_host_port = check_port(sender_host_address);
3569 if (interface_address != NULL)
3570 interface_port = check_port(interface_address);
3573 /* If an SMTP message is being received check to see if the standard input is a
3574 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3575 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3580 union sockaddr_46 inetd_sock;
3581 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3582 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3584 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3585 if (family == AF_INET || family == AF_INET6)
3587 union sockaddr_46 interface_sock;
3588 size = sizeof(interface_sock);
3590 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3591 interface_address = host_ntoa(-1, &interface_sock, NULL,
3594 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3596 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3599 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3600 NULL, &sender_host_port);
3601 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3602 "inetd is not supported when mua_wrapper is set");
3607 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3608 return EXIT_FAILURE;
3614 /* If the load average is going to be needed while receiving a message, get it
3615 now for those OS that require the first call to os_getloadavg() to be done as
3616 root. There will be further calls later for each message received. */
3618 #ifdef LOAD_AVG_NEEDS_ROOT
3619 if (receiving_message &&
3620 (queue_only_load >= 0 ||
3621 (is_inetd && smtp_load_reserve >= 0)
3624 load_average = os_getloadavg();
3628 /* The queue_only configuration option can be overridden by -odx on the command
3629 line, except that if queue_only_override is false, queue_only cannot be unset
3630 from the command line. */
3632 if (queue_only_set && (queue_only_override || arg_queue_only))
3633 queue_only = arg_queue_only;
3635 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3638 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3639 if (arg_smtp_receive_timeout >= 0)
3640 smtp_receive_timeout = arg_smtp_receive_timeout;
3642 /* If Exim was started with root privilege, unless we have already removed the
3643 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3644 except when starting the daemon or doing some kind of delivery or address
3645 testing (-bt). These are the only cases when root need to be retained. We run
3646 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3647 retained only for starting the daemon. We always do the initgroups() in this
3648 situation (controlled by the TRUE below), in order to be as close as possible
3649 to the state Exim usually runs in. */
3651 if (!unprivileged && /* originally had root AND */
3652 !removed_privilege && /* still got root AND */
3653 !daemon_listen && /* not starting the daemon */
3654 queue_interval <= 0 && /* (either kind of daemon) */
3656 deliver_drop_privilege || /* requested unprivileged */
3658 queue_interval < 0 && /* not running the queue */
3659 (msg_action_arg < 0 || /* and */
3660 msg_action != MSG_DELIVER) && /* not delivering and */
3661 (!checking || !address_test_mode) /* not address checking */
3665 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3668 /* When we are retaining a privileged uid, we still change to the exim gid. */
3670 else setgid(exim_gid);
3672 /* Handle a request to list the delivery queue */
3676 set_process_info("listing the queue");
3677 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3681 /* Handle a request to count the delivery queue */
3685 set_process_info("counting the queue");
3690 /* Handle actions on specific messages, except for the force delivery and
3691 message load actions, which are done below. Some actions take a whole list of
3692 message ids, which are known to continue up to the end of the arguments. Others
3693 take a single message id and then operate on the recipients list. */
3695 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3697 int yield = EXIT_SUCCESS;
3698 set_process_info("acting on specified messages");
3700 if (!one_msg_action)
3702 for (i = msg_action_arg; i < argc; i++)
3703 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3704 yield = EXIT_FAILURE;
3707 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3708 recipients_arg)) yield = EXIT_FAILURE;
3712 /* All the modes below here require the remaining configuration sections
3713 to be read, except that we can skip over the ACL setting when delivering
3714 specific messages, or doing a queue run. (For various testing cases we could
3715 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3718 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3720 /* The configuration data will have been read into POOL_PERM because we won't
3721 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3722 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3723 configuration were read into POOL_MAIN, because we don't do any resets till
3724 later on. However, it seems right, and it does ensure that both pools get used.
3727 store_pool = POOL_MAIN;
3729 /* Handle the -brt option. This is for checking out retry configurations.
3730 The next three arguments are a domain name or a complete address, and
3731 optionally two error numbers. All it does is to call the function that
3732 scans the retry configuration data. */
3734 if (test_retry_arg >= 0)
3736 retry_config *yield;
3737 int basic_errno = 0;
3741 if (test_retry_arg >= argc)
3743 printf("-brt needs a domain or address argument\n");
3744 exim_exit(EXIT_FAILURE);
3746 s1 = argv[test_retry_arg++];
3749 /* If the first argument contains no @ and no . it might be a local user
3750 or it might be a single-component name. Treat as a domain. */
3752 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3754 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3755 "being \ntreated as a one-component domain, not as a local part.\n\n",
3759 /* There may be an optional second domain arg. */
3761 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3762 s2 = argv[test_retry_arg++];
3764 /* The final arg is an error name */
3766 if (test_retry_arg < argc)
3768 uschar *ss = argv[test_retry_arg];
3770 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3773 printf("%s\n", CS error);
3774 return EXIT_FAILURE;
3777 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3778 code > 100 as an error is for matching codes to the decade. Turn them into
3779 a real error code, off the decade. */
3781 if (basic_errno == ERRNO_MAIL4XX ||
3782 basic_errno == ERRNO_RCPT4XX ||
3783 basic_errno == ERRNO_DATA4XX)
3785 int code = (more_errno >> 8) & 255;
3787 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3788 else if (code > 100)
3789 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3793 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3794 if (yield == NULL) printf("No retry information found\n"); else
3797 more_errno = yield->more_errno;
3798 printf("Retry rule: %s ", yield->pattern);
3800 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3802 printf("quota%s%s ",
3803 (more_errno > 0)? "_" : "",
3804 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3806 else if (yield->basic_errno == ECONNREFUSED)
3808 printf("refused%s%s ",
3809 (more_errno > 0)? "_" : "",
3810 (more_errno == 'M')? "MX" :
3811 (more_errno == 'A')? "A" : "");
3813 else if (yield->basic_errno == ETIMEDOUT)
3816 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3818 if (more_errno != 0) printf("_%s",
3819 (more_errno == 'M')? "MX" : "A");
3822 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3823 printf("auth_failed ");
3826 for (r = yield->rules; r != NULL; r = r->next)
3828 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3829 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3835 printf(",%d.", x/1000);
3849 exim_exit(EXIT_SUCCESS);
3852 /* Handle a request to list one or more configuration options */
3856 set_process_info("listing variables");
3857 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3858 else for (i = recipients_arg; i < argc; i++)
3861 (Ustrcmp(argv[i], "router") == 0 ||
3862 Ustrcmp(argv[i], "transport") == 0 ||
3863 Ustrcmp(argv[i], "authenticator") == 0))
3865 readconf_print(argv[i+1], argv[i]);
3868 else readconf_print(argv[i], NULL);
3870 exim_exit(EXIT_SUCCESS);
3874 /* Handle a request to deliver one or more messages that are already on the
3875 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3876 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3878 Delivery of specific messages is typically used for a small number when
3879 prodding by hand (when the option forced_delivery will be set) or when
3880 re-execing to regain root privilege. Each message delivery must happen in a
3881 separate process, so we fork a process for each one, and run them sequentially
3882 so that debugging output doesn't get intertwined, and to avoid spawning too
3883 many processes if a long list is given. However, don't fork for the last one;
3884 this saves a process in the common case when Exim is called to deliver just one
3887 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3889 if (prod_requires_admin && !admin_user)
3891 fprintf(stderr, "exim: Permission denied\n");
3892 exim_exit(EXIT_FAILURE);
3894 set_process_info("delivering specified messages");
3895 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3896 for (i = msg_action_arg; i < argc; i++)
3901 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3902 else if ((pid = fork()) == 0)
3904 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3905 _exit(EXIT_SUCCESS);
3909 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3911 exim_exit(EXIT_FAILURE);
3915 exim_exit(EXIT_SUCCESS);
3919 /* If only a single queue run is requested, without SMTP listening, we can just
3920 turn into a queue runner, with an optional starting message id. */
3922 if (queue_interval == 0 && !daemon_listen)
3924 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3925 (start_queue_run_id == NULL)? US"" : US" starting at ",
3926 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3927 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3928 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3929 set_process_info("running the queue (single queue run)");
3930 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3931 exim_exit(EXIT_SUCCESS);
3935 /* Find the login name of the real user running this process. This is always
3936 needed when receiving a message, because it is written into the spool file. It
3937 may also be used to construct a from: or a sender: header, and in this case we
3938 need the user's full name as well, so save a copy of it, checked for RFC822
3939 syntax and munged if necessary, if it hasn't previously been set by the -F
3940 argument. We may try to get the passwd entry more than once, in case NIS or
3941 other delays are in evidence. Save the home directory for use in filter testing
3946 if ((pw = getpwuid(real_uid)) != NULL)
3948 originator_login = string_copy(US pw->pw_name);
3949 originator_home = string_copy(US pw->pw_dir);
3951 /* If user name has not been set by -F, set it from the passwd entry
3952 unless -f has been used to set the sender address by a trusted user. */
3954 if (originator_name == NULL)
3956 if (sender_address == NULL ||
3957 (!trusted_caller && filter_test == FTEST_NONE))
3959 uschar *name = US pw->pw_gecos;
3960 uschar *amp = Ustrchr(name, '&');
3963 /* Most Unix specify that a '&' character in the gecos field is
3964 replaced by a copy of the login name, and some even specify that
3965 the first character should be upper cased, so that's what we do. */
3970 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3971 amp - name, name, &loffset, originator_login, amp + 1);
3972 buffer[loffset] = toupper(buffer[loffset]);
3976 /* If a pattern for matching the gecos field was supplied, apply
3977 it and then expand the name string. */
3979 if (gecos_pattern != NULL && gecos_name != NULL)
3982 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3984 if (regex_match_and_setup(re, name, 0, -1))
3986 uschar *new_name = expand_string(gecos_name);
3988 if (new_name != NULL)
3990 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3991 "gecos field \"%s\"\n", new_name, name);
3994 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3995 "\"%s\": %s\n", gecos_name, expand_string_message);
3997 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3998 "gecos field \"%s\"\n", gecos_pattern, name);
3999 store_free((void *)re);
4001 originator_name = string_copy(name);
4004 /* A trusted caller has used -f but not -F */
4006 else originator_name = US"";
4009 /* Break the retry loop */
4014 if (++i > finduser_retries) break;
4018 /* If we cannot get a user login, log the incident and give up, unless the
4019 configuration specifies something to use. When running in the test harness,
4020 any setting of unknown_login overrides the actual name. */
4022 if (originator_login == NULL || running_in_test_harness)
4024 if (unknown_login != NULL)
4026 originator_login = expand_string(unknown_login);
4027 if (originator_name == NULL && unknown_username != NULL)
4028 originator_name = expand_string(unknown_username);
4029 if (originator_name == NULL) originator_name = US"";
4031 if (originator_login == NULL)
4032 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4036 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4039 originator_name = string_copy(parse_fix_phrase(originator_name,
4040 Ustrlen(originator_name), big_buffer, big_buffer_size));
4042 /* If a message is created by this call of Exim, the uid/gid of its originator
4043 are those of the caller. These values are overridden if an existing message is
4044 read in from the spool. */
4046 originator_uid = real_uid;
4047 originator_gid = real_gid;
4049 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4050 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4052 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4053 returns. We leave this till here so that the originator_ fields are available
4054 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4057 if (daemon_listen || queue_interval > 0)
4061 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4062 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4063 "mua_wrapper is set");
4068 /* If the sender ident has not been set (by a trusted caller) set it to
4069 the caller. This will get overwritten below for an inetd call. If a trusted
4070 caller has set it empty, unset it. */
4072 if (sender_ident == NULL) sender_ident = originator_login;
4073 else if (sender_ident[0] == 0) sender_ident = NULL;
4075 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4076 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4077 originator_* variables set. */
4079 if (test_rewrite_arg >= 0)
4081 really_exim = FALSE;
4082 if (test_rewrite_arg >= argc)
4084 printf("-brw needs an address argument\n");
4085 exim_exit(EXIT_FAILURE);
4087 rewrite_test(argv[test_rewrite_arg]);
4088 exim_exit(EXIT_SUCCESS);
4091 /* A locally-supplied message is considered to be coming from a local user
4092 unless a trusted caller supplies a sender address with -f, or is passing in the
4093 message via SMTP (inetd invocation or otherwise). */
4095 if ((sender_address == NULL && !smtp_input) ||
4096 (!trusted_caller && filter_test == FTEST_NONE))
4098 sender_local = TRUE;
4100 /* A trusted caller can supply authenticated_sender and authenticated_id
4101 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4102 defaults except when host checking. */
4104 if (authenticated_sender == NULL && !host_checking)
4105 authenticated_sender = string_sprintf("%s@%s", originator_login,
4106 qualify_domain_sender);
4107 if (authenticated_id == NULL && !host_checking)
4108 authenticated_id = originator_login;
4111 /* Trusted callers are always permitted to specify the sender address.
4112 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4113 is specified is the empty address. However, if a trusted caller does not
4114 specify a sender address for SMTP input, we leave sender_address unset. This
4115 causes the MAIL commands to be honoured. */
4117 if ((!smtp_input && sender_address == NULL) ||
4118 !receive_check_set_sender(sender_address))
4120 /* Either the caller is not permitted to set a general sender, or this is
4121 non-SMTP input and the trusted caller has not set a sender. If there is no
4122 sender, or if a sender other than <> is set, override with the originator's
4123 login (which will get qualified below), except when checking things. */
4125 if (sender_address == NULL /* No sender_address set */
4127 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4128 !checking && /* Not running tests, AND */
4129 filter_test == FTEST_NONE)) /* Not testing a filter */
4131 sender_address = originator_login;
4132 sender_address_forced = FALSE;
4133 sender_address_domain = 0;
4137 /* Remember whether an untrusted caller set the sender address */
4139 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4141 /* Ensure that the sender address is fully qualified unless it is the empty
4142 address, which indicates an error message, or doesn't exist (root caller, smtp
4143 interface, no -f argument). */
4145 if (sender_address != NULL && sender_address[0] != 0 &&
4146 sender_address_domain == 0)
4147 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4148 qualify_domain_sender);
4150 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4152 /* Handle a request to verify a list of addresses, or test them for delivery.
4153 This must follow the setting of the sender address, since routers can be
4154 predicated upon the sender. If no arguments are given, read addresses from
4155 stdin. Set debug_level to at least D_v to get full output for address testing.
4158 if (verify_address_mode || address_test_mode)
4161 int flags = vopt_qualify;
4163 if (verify_address_mode)
4165 if (!verify_as_sender) flags |= vopt_is_recipient;
4166 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4171 flags |= vopt_is_recipient;
4172 debug_selector |= D_v;
4173 debug_file = stderr;
4174 debug_fd = fileno(debug_file);
4175 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4178 if (recipients_arg < argc)
4180 while (recipients_arg < argc)
4182 uschar *s = argv[recipients_arg++];
4185 BOOL finished = FALSE;
4186 uschar *ss = parse_find_address_end(s, FALSE);
4187 if (*ss == ',') *ss = 0; else finished = TRUE;
4188 test_address(s, flags, &exit_value);
4191 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4198 uschar *s = get_stdinput(NULL, NULL);
4199 if (s == NULL) break;
4200 test_address(s, flags, &exit_value);
4204 exim_exit(exit_value);
4207 /* Handle expansion checking. Either expand items on the command line, or read
4208 from stdin if there aren't any. If -Mset was specified, load the message so
4209 that its variables can be used, but restrict this facility to admin users.
4210 Otherwise, if -bem was used, read a message from stdin. */
4214 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4216 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4219 fprintf(stderr, "exim: permission denied\n");
4222 message_id = argv[msg_action_arg];
4223 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4224 if (!spool_open_datafile(message_id))
4225 printf ("Failed to load message datafile %s\n", message_id);
4226 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4227 printf ("Failed to load message %s\n", message_id);
4230 /* Read a test message from a file. We fudge it up to be on stdin, saving
4231 stdin itself for later reading of expansion strings. */
4233 else if (expansion_test_message != NULL)
4235 int save_stdin = dup(0);
4236 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4239 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4241 return EXIT_FAILURE;
4244 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4245 message_ended = END_NOTENDED;
4246 read_message_body(receive_msg(extract_recipients));
4247 message_linecount += body_linecount;
4248 (void)dup2(save_stdin, 0);
4249 (void)close(save_stdin);
4250 clearerr(stdin); /* Required by Darwin */
4253 /* Allow $recipients for this testing */
4255 enable_dollar_recipients = TRUE;
4257 /* Expand command line items */
4259 if (recipients_arg < argc)
4261 while (recipients_arg < argc)
4263 uschar *s = argv[recipients_arg++];
4264 uschar *ss = expand_string(s);
4265 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4266 else printf("%s\n", CS ss);
4274 char *(*fn_readline)(char *) = NULL;
4275 char *(*fn_addhist)(char *) = NULL;
4278 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4284 uschar *source = get_stdinput(fn_readline, fn_addhist);
4285 if (source == NULL) break;
4286 ss = expand_string(source);
4288 printf ("Failed: %s\n", expand_string_message);
4289 else printf("%s\n", CS ss);
4293 if (dlhandle != NULL) dlclose(dlhandle);
4297 /* The data file will be open after -Mset */
4299 if (deliver_datafile >= 0)
4301 (void)close(deliver_datafile);
4302 deliver_datafile = -1;
4305 exim_exit(EXIT_SUCCESS);
4309 /* The active host name is normally the primary host name, but it can be varied
4310 for hosts that want to play several parts at once. We need to ensure that it is
4311 set for host checking, and for receiving messages. */
4313 smtp_active_hostname = primary_hostname;
4314 if (raw_active_hostname != NULL)
4316 uschar *nah = expand_string(raw_active_hostname);
4319 if (!expand_string_forcedfail)
4320 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4321 "(smtp_active_hostname): %s", raw_active_hostname,
4322 expand_string_message);
4324 else if (nah[0] != 0) smtp_active_hostname = nah;
4327 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4328 given IP address so that the blocking and relay configuration can be tested.
4329 Unless a sender_ident was set by -oMt, we discard it (the default is the
4330 caller's login name). An RFC 1413 call is made only if we are running in the
4331 test harness and an incoming interface and both ports are specified, because
4332 there is no TCP/IP call to find the ident for. */
4339 if (!sender_ident_set)
4341 sender_ident = NULL;
4342 if (running_in_test_harness && sender_host_port != 0 &&
4343 interface_address != NULL && interface_port != 0)
4344 verify_get_ident(1413);
4347 /* In case the given address is a non-canonical IPv6 address, canonicize
4348 it. The code works for both IPv4 and IPv6, as it happens. */
4350 size = host_aton(sender_host_address, x);
4351 sender_host_address = store_get(48); /* large enough for full IPv6 */
4352 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4354 /* Now set up for testing */
4356 host_build_sender_fullhost();
4360 sender_local = FALSE;
4361 sender_host_notsocket = TRUE;
4362 debug_file = stderr;
4363 debug_fd = fileno(debug_file);
4364 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4365 "**** but without any ident (RFC 1413) callback.\n"
4366 "**** This is not for real!\n\n",
4367 sender_host_address);
4369 if (verify_check_host(&hosts_connection_nolog) == OK)
4370 log_write_selector &= ~L_smtp_connection;
4371 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4373 if (smtp_start_session())
4375 reset_point = store_get(0);
4378 store_reset(reset_point);
4379 if (smtp_setup_msg() <= 0) break;
4380 if (!receive_msg(FALSE)) break;
4383 exim_exit(EXIT_SUCCESS);
4387 /* Arrange for message reception if recipients or SMTP were specified;
4388 otherwise complain unless a version print (-bV) happened or this is a filter
4389 verification test. In the former case, show the configuration file name. */
4391 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4393 if (version_printed)
4395 printf("Configuration file is %s\n", config_main_filename);
4396 return EXIT_SUCCESS;
4398 if (filter_test == FTEST_NONE)
4401 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4402 "not directly from a shell command line. Options and/or arguments control\n"
4403 "what it does when called. For a list of options, see the Exim documentation.\n");
4404 return EXIT_FAILURE;
4409 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4410 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4411 that we are not called from inetd, because that is rejected above. The
4412 following configuration settings are forced here:
4414 (1) Synchronous delivery (-odi)
4415 (2) Errors to stderr (-oep == -oeq)
4416 (3) No parallel remote delivery
4417 (4) Unprivileged delivery
4419 We don't force overall queueing options because there are several of them;
4420 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4421 to override any SMTP queueing. */
4425 synchronous_delivery = TRUE;
4426 arg_error_handling = ERRORS_STDERR;
4427 remote_max_parallel = 1;
4428 deliver_drop_privilege = TRUE;
4430 queue_smtp_domains = NULL;
4434 /* Prepare to accept one or more new messages on the standard input. When a
4435 message has been read, its id is returned in message_id[]. If doing immediate
4436 delivery, we fork a delivery process for each received message, except for the
4437 last one, where we can save a process switch.
4439 It is only in non-smtp mode that error_handling is allowed to be changed from
4440 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4441 sendmail error modes other than -oem ever actually used? Later: yes.) */
4443 if (!smtp_input) error_handling = arg_error_handling;
4445 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4446 logging being sent down the socket and make an identd call to get the
4451 (void)fclose(stderr);
4452 exim_nullstd(); /* Re-open to /dev/null */
4453 verify_get_ident(IDENT_PORT);
4454 host_build_sender_fullhost();
4455 set_process_info("handling incoming connection from %s via inetd",
4459 /* If the sender host address has been set, build sender_fullhost if it hasn't
4460 already been done (which it will have been for inetd). This caters for the
4461 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4462 so that the test for IP options is skipped for -bs input. */
4464 if (sender_host_address != NULL && sender_fullhost == NULL)
4466 host_build_sender_fullhost();
4467 set_process_info("handling incoming connection from %s via -oMa",
4469 sender_host_notsocket = TRUE;
4472 /* Otherwise, set the sender host as unknown except for inetd calls. This
4473 prevents host checking in the case of -bs not from inetd and also for -bS. */
4475 else if (!is_inetd) sender_host_unknown = TRUE;
4477 /* If stdout does not exist, then dup stdin to stdout. This can happen
4478 if exim is started from inetd. In this case fd 0 will be set to the socket,
4479 but fd 1 will not be set. This also happens for passed SMTP channels. */
4481 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4483 /* Set up the incoming protocol name and the state of the program. Root
4484 is allowed to force received protocol via the -oMr option above, and if we are
4485 in a non-local SMTP state it means we have come via inetd and the process info
4486 has already been set up. We don't set received_protocol here for smtp input,
4487 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4491 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4496 if (received_protocol == NULL)
4497 received_protocol = string_sprintf("local%s", called_as);
4498 set_process_info("accepting a local non-SMTP message from <%s>",
4502 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4506 local_queue_only = queue_only;
4508 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4509 the spool if so configured. On failure, we must not attempt to send an error
4510 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4511 error code is given.) */
4513 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4515 fprintf(stderr, "exim: insufficient disk space\n");
4516 return EXIT_FAILURE;
4519 /* If this is smtp input of any kind, handle the start of the SMTP
4526 if (verify_check_host(&hosts_connection_nolog) == OK)
4527 log_write_selector &= ~L_smtp_connection;
4528 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4529 if (!smtp_start_session())
4532 exim_exit(EXIT_SUCCESS);
4536 /* Otherwise, set up the input size limit here. */
4540 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4541 if (expand_string_message != NULL)
4543 if (thismessage_size_limit == -1)
4544 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4545 "message_size_limit: %s", expand_string_message);
4547 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4548 "message_size_limit: %s", expand_string_message);
4552 /* Loop for several messages when reading SMTP input. If we fork any child
4553 processes, we don't want to wait for them unless synchronous delivery is
4554 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4555 same as SIG_DFL, despite the fact that documentation often lists the default as
4556 "ignore". This is a confusing area. This is what I know:
4558 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4559 processes that complete simply to go away without ever becoming defunct. You
4560 can't then wait for them - but we don't want to wait for them in the
4561 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4562 happen for all OS (e.g. *BSD is different).
4564 But that's not the end of the story. Some (many? all?) systems have the
4565 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4566 has by default, so it seems that the difference is merely one of default
4567 (compare restarting vs non-restarting signals).
4569 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4570 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4571 of the loop below. Paranoia rules.
4573 February 2003: That's *still* not the end of the story. There are now versions
4574 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4575 process then calls waitpid(), a grumble is written to the system log, because
4576 this is logically inconsistent. In other words, it doesn't like the paranoia.
4577 As a consequenc of this, the waitpid() below is now excluded if we are sure
4578 that SIG_IGN works. */
4580 if (!synchronous_delivery)
4583 struct sigaction act;
4584 act.sa_handler = SIG_IGN;
4585 sigemptyset(&(act.sa_mask));
4586 act.sa_flags = SA_NOCLDWAIT;
4587 sigaction(SIGCHLD, &act, NULL);
4589 signal(SIGCHLD, SIG_IGN);
4593 /* Save the current store pool point, for resetting at the start of
4594 each message, and save the real sender address, if any. */
4596 reset_point = store_get(0);
4597 real_sender_address = sender_address;
4599 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4600 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4605 store_reset(reset_point);
4608 /* In the SMTP case, we have to handle the initial SMTP input and build the
4609 recipients list, before calling receive_msg() to read the message proper.
4610 Whatever sender address is actually given in the SMTP transaction is
4611 actually ignored for local senders - we use the actual sender, which is
4612 normally either the underlying user running this process or a -f argument
4613 provided by a trusted caller. It is saved in real_sender_address.
4615 However, if this value is NULL, we are dealing with a trusted caller when
4616 -f was not used; in this case, the SMTP sender is allowed to stand.
4618 Also, if untrusted_set_sender is set, we permit sender addresses that match
4619 anything in its list.
4621 The variable raw_sender_address holds the sender address before rewriting. */
4626 if ((rc = smtp_setup_msg()) > 0)
4628 if (real_sender_address != NULL &&
4629 !receive_check_set_sender(sender_address))
4631 sender_address = raw_sender = real_sender_address;
4632 sender_address_unrewritten = NULL;
4634 more = receive_msg(extract_recipients);
4635 if (message_id[0] == 0)
4638 exim_exit(EXIT_FAILURE);
4641 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4644 /* In the non-SMTP case, we have all the information from the command
4645 line, but must process it in case it is in the more general RFC822
4646 format, and in any case, to detect syntax errors. Also, it appears that
4647 the use of comma-separated lists as single arguments is common, so we
4648 had better support them. */
4654 int count = argc - recipients_arg;
4655 uschar **list = argv + recipients_arg;
4657 /* These options cannot be changed dynamically for non-SMTP messages */
4659 active_local_sender_retain = local_sender_retain;
4660 active_local_from_check = local_from_check;
4662 /* Save before any rewriting */
4664 raw_sender = string_copy(sender_address);
4666 /* Loop for each argument */
4668 for (i = 0; i < count; i++)
4670 int start, end, domain;
4672 uschar *s = list[i];
4674 /* Loop for each comma-separated address */
4678 BOOL finished = FALSE;
4680 uschar *ss = parse_find_address_end(s, FALSE);
4682 if (*ss == ',') *ss = 0; else finished = TRUE;
4684 /* Check max recipients - if -t was used, these aren't recipients */
4686 if (recipients_max > 0 && ++rcount > recipients_max &&
4687 !extract_recipients)
4689 if (error_handling == ERRORS_STDERR)
4691 fprintf(stderr, "exim: too many recipients\n");
4692 exim_exit(EXIT_FAILURE);
4697 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4698 errors_sender_rc : EXIT_FAILURE;
4703 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4705 if (domain == 0 && !allow_unqualified_recipient)
4708 errmess = US"unqualified recipient address not allowed";
4711 if (recipient == NULL)
4713 if (error_handling == ERRORS_STDERR)
4715 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4716 string_printing(list[i]), errmess);
4717 exim_exit(EXIT_FAILURE);
4723 eblock.text1 = string_printing(list[i]);
4724 eblock.text2 = errmess;
4726 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4727 errors_sender_rc : EXIT_FAILURE;
4731 receive_add_recipient(recipient, -1);
4734 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4738 /* Show the recipients when debugging */
4743 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4744 if (recipients_list != NULL)
4746 debug_printf("Recipients:\n");
4747 for (i = 0; i < recipients_count; i++)
4748 debug_printf(" %s\n", recipients_list[i].address);
4752 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4753 ignored; rejecting here would just add complication, and it can just as
4754 well be done later. Allow $recipients to be visible in the ACL. */
4756 if (acl_not_smtp_start != NULL)
4758 uschar *user_msg, *log_msg;
4759 enable_dollar_recipients = TRUE;
4760 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4761 &user_msg, &log_msg);
4762 enable_dollar_recipients = FALSE;
4765 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4766 will just read the headers for the message, and not write anything onto the
4769 message_ended = END_NOTENDED;
4770 more = receive_msg(extract_recipients);
4772 /* more is always FALSE here (not SMTP message) when reading a message
4773 for real; when reading the headers of a message for filter testing,
4774 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4776 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4777 } /* Non-SMTP message reception */
4779 /* If this is a filter testing run, there are headers in store, but
4780 no message on the spool. Run the filtering code in testing mode, setting
4781 the domain to the qualify domain and the local part to the current user,
4782 unless they have been set by options. The prefix and suffix are left unset
4783 unless specified. The the return path is set to to the sender unless it has
4784 already been set from a return-path header in the message. */
4786 if (filter_test != FTEST_NONE)
4788 deliver_domain = (ftest_domain != NULL)?
4789 ftest_domain : qualify_domain_recipient;
4790 deliver_domain_orig = deliver_domain;
4791 deliver_localpart = (ftest_localpart != NULL)?
4792 ftest_localpart : originator_login;
4793 deliver_localpart_orig = deliver_localpart;
4794 deliver_localpart_prefix = ftest_prefix;
4795 deliver_localpart_suffix = ftest_suffix;
4796 deliver_home = originator_home;
4798 if (return_path == NULL)
4800 printf("Return-path copied from sender\n");
4801 return_path = string_copy(sender_address);
4805 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4807 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4809 receive_add_recipient(
4810 string_sprintf("%s%s%s@%s",
4811 (ftest_prefix == NULL)? US"" : ftest_prefix,
4813 (ftest_suffix == NULL)? US"" : ftest_suffix,
4814 deliver_domain), -1);
4816 printf("Recipient = %s\n", recipients_list[0].address);
4817 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4818 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4820 (void)chdir("/"); /* Get away from wherever the user is running this from */
4822 /* Now we run either a system filter test, or a user filter test, or both.
4823 In the latter case, headers added by the system filter will persist and be
4824 available to the user filter. We need to copy the filter variables
4827 if ((filter_test & FTEST_SYSTEM) != 0)
4829 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4830 exim_exit(EXIT_FAILURE);
4833 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4835 if ((filter_test & FTEST_USER) != 0)
4837 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4838 exim_exit(EXIT_FAILURE);
4841 exim_exit(EXIT_SUCCESS);
4844 /* Else act on the result of message reception. We should not get here unless
4845 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4846 TRUE. If it is not, check on the number of messages received in this
4847 connection. If that's OK and queue_only_load is set, check that the load
4848 average is below it. If it is not, set local_queue_only TRUE. Note that it
4849 then remains this way for any subsequent messages on the same SMTP connection.
4850 This is a deliberate choice; even though the load average may fall, it
4851 doesn't seem right to deliver later messages on the same call when not
4852 delivering earlier ones. */
4854 if (!local_queue_only)
4856 if (smtp_accept_queue_per_connection > 0 &&
4857 receive_messagecount > smtp_accept_queue_per_connection)
4859 local_queue_only = TRUE;
4860 queue_only_reason = 2;
4862 else if (queue_only_load >= 0)
4864 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4865 if (local_queue_only) queue_only_reason = 3;
4869 /* If running as an MUA wrapper, all queueing options and freezing options
4873 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4875 /* Log the queueing here, when it will get a message id attached, but
4876 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4879 if (local_queue_only) switch(queue_only_reason)
4882 log_write(L_delay_delivery,
4883 LOG_MAIN, "no immediate delivery: more than %d messages "
4884 "received in one connection", smtp_accept_queue_per_connection);
4888 log_write(L_delay_delivery,
4889 LOG_MAIN, "no immediate delivery: load average %.2f",
4890 (double)load_average/1000.0);
4894 /* Else do the delivery unless the ACL or local_scan() called for queue only
4895 or froze the message. Always deliver in a separate process. A fork failure is
4896 not a disaster, as the delivery will eventually happen on a subsequent queue
4897 run. The search cache must be tidied before the fork, as the parent will
4898 do it before exiting. The child will trigger a lookup failure and
4899 thereby defer the delivery if it tries to use (for example) a cached ldap
4900 connection that the parent has called unbind on. */
4902 else if (!queue_only_policy && !deliver_freeze)
4907 if ((pid = fork()) == 0)
4910 close_unwanted(); /* Close unwanted file descriptors and TLS */
4911 exim_nullstd(); /* Ensure std{in,out,err} exist */
4913 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4914 mode, deliver_drop_privilege is forced TRUE). */
4916 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4918 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4920 /* Control does not return here. */
4923 /* No need to re-exec */
4925 rc = deliver_message(message_id, FALSE, FALSE);
4927 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4928 EXIT_SUCCESS : EXIT_FAILURE);
4933 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4934 "process: %s", strerror(errno));
4937 /* In the parent, wait if synchronous delivery is required. This will
4938 always be the case in MUA wrapper mode. */
4940 else if (synchronous_delivery)
4943 while (wait(&status) != pid);
4944 if ((status & 0x00ff) != 0)
4945 log_write(0, LOG_MAIN|LOG_PANIC,
4946 "process %d crashed with signal %d while delivering %s",
4947 (int)pid, status & 0x00ff, message_id);
4948 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4952 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4953 automatically reaps children (see comments above the loop), clear away any
4954 finished subprocesses here, in case there are lots of messages coming in
4955 from the same source. */
4957 #ifndef SIG_IGN_WORKS
4958 while (waitpid(-1, NULL, WNOHANG) > 0);
4962 exim_exit(EXIT_SUCCESS); /* Never returns */
4963 return 0; /* To stop compiler warning */