1 /* $Cambridge: exim/src/src/exim.c,v 1.57 2007/06/27 11:01:51 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
390 filename the file name
391 options the fopen() options
392 mode the required mode
394 Returns: the fopened FILE or NULL
398 modefopen(uschar *filename, char *options, mode_t mode)
400 mode_t saved_umask = umask(0777);
401 FILE *f = Ufopen(filename, options);
402 (void)umask(saved_umask);
403 if (f != NULL) (void)fchmod(fileno(f), mode);
410 /*************************************************
411 * Ensure stdin, stdout, and stderr exist *
412 *************************************************/
414 /* Some operating systems grumble if an exec() happens without a standard
415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
416 file will be opened and will use these fd values, and then some other bit of
417 code will assume, for example, that it can write error messages to stderr.
418 This function ensures that fds 0, 1, and 2 are open if they do not already
419 exist, by connecting them to /dev/null.
421 This function is also used to ensure that std{in,out,err} exist at all times,
422 so that if any library that Exim calls tries to use them, it doesn't crash.
434 for (i = 0; i <= 2; i++)
436 if (fstat(i, &statbuf) < 0 && errno == EBADF)
438 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
439 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
440 string_open_failed(errno, "/dev/null"));
441 if (devnull != i) (void)dup2(devnull, i);
444 if (devnull > 2) (void)close(devnull);
450 /*************************************************
451 * Close unwanted file descriptors for delivery *
452 *************************************************/
454 /* This function is called from a new process that has been forked to deliver
455 an incoming message, either directly, or using exec.
457 We want any smtp input streams to be closed in this new process. However, it
458 has been observed that using fclose() here causes trouble. When reading in -bS
459 input, duplicate copies of messages have been seen. The files will be sharing a
460 file pointer with the parent process, and it seems that fclose() (at least on
461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
462 least sometimes. Hence we go for closing the underlying file descriptors.
464 If TLS is active, we want to shut down the TLS library, but without molesting
465 the parent's SSL connection.
467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
468 stderr unless debugging) because the calling process might have set them up as
469 pipes and be waiting for them to close before it waits for the submission
470 process to terminate. If they aren't closed, they hold up the calling process
471 until the initial delivery process finishes, which is not what we want.
473 Exception: We do want it for synchronous delivery!
475 And notwithstanding all the above, if D_resolver is set, implying resolver
476 debugging, leave stdout open, because that's where the resolver writes its
479 When we close stderr (which implies we've also closed stdout), we also get rid
480 of any controlling terminal.
492 tls_close(FALSE); /* Shut down the TLS library */
494 (void)close(fileno(smtp_in));
495 (void)close(fileno(smtp_out));
500 (void)close(0); /* stdin */
501 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
502 if (debug_selector == 0) /* stderr */
504 if (!synchronous_delivery)
517 /*************************************************
519 *************************************************/
521 /* This function sets a new uid and gid permanently, optionally calling
522 initgroups() to set auxiliary groups. There are some special cases when running
523 Exim in unprivileged modes. In these situations the effective uid will not be
524 root; if we already have the right effective uid/gid, and don't need to
525 initialize any groups, leave things as they are.
530 igflag TRUE if initgroups() wanted
531 msg text to use in debugging output and failure log
533 Returns: nothing; bombs out on failure
537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
539 uid_t euid = geteuid();
540 gid_t egid = getegid();
542 if (euid == root_uid || euid != uid || egid != gid || igflag)
544 /* At least one OS returns +1 for initgroups failure, so just check for
549 struct passwd *pw = getpwuid(uid);
552 if (initgroups(pw->pw_name, gid) != 0)
553 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
554 (long int)uid, strerror(errno));
556 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
557 "no passwd entry for uid=%ld", (long int)uid);
560 if (setgid(gid) < 0 || setuid(uid) < 0)
562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
563 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
567 /* Debugging output included uid/gid and all groups */
572 gid_t group_list[NGROUPS_MAX];
573 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
574 (long int)geteuid(), (long int)getegid(), (long int)getpid());
575 group_count = getgroups(NGROUPS_MAX, group_list);
576 debug_printf(" auxiliary group list:");
580 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
582 else debug_printf(" <none>");
590 /*************************************************
592 *************************************************/
594 /* Exim exits via this function so that it always clears up any open
600 Returns: does not return
608 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
609 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
616 /*************************************************
617 * Extract port from host address *
618 *************************************************/
620 /* Called to extract the port from the values given to -oMa and -oMi.
621 It also checks the syntax of the address, and terminates it before the
622 port data when a port is extracted.
625 address the address, with possible port on the end
627 Returns: the port, or zero if there isn't one
628 bombs out on a syntax error
632 check_port(uschar *address)
634 int port = host_address_extract_port(address);
635 if (string_is_ip_address(address, NULL) == 0)
637 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
645 /*************************************************
646 * Test/verify an address *
647 *************************************************/
649 /* This function is called by the -bv and -bt code. It extracts a working
650 address from a full RFC 822 address. This isn't really necessary per se, but it
651 has the effect of collapsing source routes.
655 flags flag bits for verify_address()
656 exit_value to be set for failures
662 test_address(uschar *s, int flags, int *exit_value)
664 int start, end, domain;
665 uschar *parse_error = NULL;
666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
670 fprintf(stdout, "syntax error: %s\n", parse_error);
675 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
676 -1, -1, NULL, NULL, NULL);
677 if (rc == FAIL) *exit_value = 2;
678 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
684 /*************************************************
685 * Decode bit settings for log/debug *
686 *************************************************/
688 /* This function decodes a string containing bit settings in the form of +name
689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
690 also recognizes a numeric setting of the form =<number>, but this is not
691 intended for user use. It's an easy way for Exim to pass the debug settings
692 when it is re-exec'ed.
694 The log options are held in two unsigned ints (because there became too many
695 for one). The top bit in the table means "put in 2nd selector". This does not
696 yet apply to debug options, so the "=" facility sets only the first selector.
698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
699 It sets all the bits in both selectors. However, there is a facility for then
700 unsetting certain bits, because we want to turn off "memory" in the debug case.
702 A bad value for a debug setting is treated as an unknown option - error message
703 to stderr and die. For log settings, which come from the configuration file,
704 we write to the log on the way out...
707 selector1 address of the first bit string
708 selector2 address of the second bit string, or NULL
709 notall1 bits to exclude from "all" for selector1
710 notall2 bits to exclude from "all" for selector2
711 string the configured string
712 options the table of option names
714 which "log" or "debug"
716 Returns: nothing on success - bomb out on failure
720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
721 int notall2, uschar *string, bit_table *options, int count, uschar *which)
724 if (string == NULL) return;
728 char *end; /* Not uschar */
729 *selector1 = strtoul(CS string+1, &end, 0);
730 if (*end == 0) return;
731 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
736 /* Handle symbolic setting */
743 bit_table *start, *end;
745 while (isspace(*string)) string++;
746 if (*string == 0) return;
748 if (*string != '+' && *string != '-')
750 errmsg = string_sprintf("malformed %s_selector setting: "
751 "+ or - expected but found \"%s\"", which, string);
755 adding = *string++ == '+';
757 while (isalnum(*string) || *string == '_') string++;
761 end = options + count;
765 bit_table *middle = start + (end - start)/2;
766 int c = Ustrncmp(s, middle->name, len);
769 if (middle->name[len] != 0) c = -1; else
771 unsigned int bit = middle->bit;
772 unsigned int *selector;
774 /* The value with all bits set means "force all bits in both selectors"
775 in the case where two are being handled. However, the top bit in the
776 second selector is never set. When setting, some bits can be excluded.
779 if (bit == 0xffffffff)
783 *selector1 = 0xffffffff ^ notall1;
784 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
789 if (selector2 != NULL) *selector2 = 0;
793 /* Otherwise, the 0x80000000 bit means "this value, without the top
794 bit, belongs in the second selector". */
798 if ((bit & 0x80000000) != 0)
800 selector = selector2;
803 else selector = selector1;
804 if (adding) *selector |= bit; else *selector &= ~bit;
806 break; /* Out of loop to match selector name */
809 if (c < 0) end = middle; else start = middle + 1;
810 } /* Loop to match selector name */
814 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
815 adding? '+' : '-', len, s);
818 } /* Loop for selector names */
820 /* Handle disasters */
823 if (Ustrcmp(which, "debug") == 0)
825 fprintf(stderr, "exim: %s\n", errmsg);
828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
833 /*************************************************
834 * Show supported features *
835 *************************************************/
837 /* This function is called for -bV and for -d to output the optional features
838 of the current Exim binary.
840 Arguments: a FILE for printing
845 show_whats_supported(FILE *f)
847 #ifdef DB_VERSION_STRING
848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
851 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
853 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
856 fprintf(f, "Probably ndbm\n");
857 #elif defined(USE_TDB)
858 fprintf(f, "Using tdb\n");
861 fprintf(f, "Probably GDBM (native mode)\n");
863 fprintf(f, "Probably GDBM (compatibility mode)\n");
867 fprintf(f, "Support for:");
868 #ifdef SUPPORT_CRYPTEQ
869 fprintf(f, " crypteq");
872 fprintf(f, " iconv()");
877 #ifdef HAVE_SETCLASSRESOURCES
878 fprintf(f, " use_setclassresources");
887 fprintf(f, " Expand_dlfunc");
889 #ifdef USE_TCP_WRAPPERS
890 fprintf(f, " TCPwrappers");
894 fprintf(f, " GnuTLS");
896 fprintf(f, " OpenSSL");
899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
900 fprintf(f, " translate_ip_address");
902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
903 fprintf(f, " move_frozen_messages");
905 #ifdef WITH_CONTENT_SCAN
906 fprintf(f, " Content_Scanning");
908 #ifdef WITH_OLD_DEMIME
909 fprintf(f, " Old_Demime");
911 #ifdef EXPERIMENTAL_SPF
912 fprintf(f, " Experimental_SPF");
914 #ifdef EXPERIMENTAL_SRS
915 fprintf(f, " Experimental_SRS");
917 #ifdef EXPERIMENTAL_BRIGHTMAIL
918 fprintf(f, " Experimental_Brightmail");
920 #ifdef EXPERIMENTAL_DOMAINKEYS
921 fprintf(f, " Experimental_DomainKeys");
925 fprintf(f, "Lookups:");
926 #ifdef LOOKUP_LSEARCH
927 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
933 fprintf(f, " dbm dbmnz");
936 fprintf(f, " dnsdb");
938 #ifdef LOOKUP_DSEARCH
939 fprintf(f, " dsearch");
942 fprintf(f, " ibase");
945 fprintf(f, " ldap ldapdn ldapm");
948 fprintf(f, " mysql");
951 fprintf(f, " nis nis0");
953 #ifdef LOOKUP_NISPLUS
954 fprintf(f, " nisplus");
957 fprintf(f, " oracle");
960 fprintf(f, " passwd");
963 fprintf(f, " pgsql");
966 fprintf(f, " sqlite");
969 fprintf(f, " testdb");
972 fprintf(f, " whoson");
976 fprintf(f, "Authenticators:");
978 fprintf(f, " cram_md5");
980 #ifdef AUTH_CYRUS_SASL
981 fprintf(f, " cyrus_sasl");
984 fprintf(f, " dovecot");
986 #ifdef AUTH_PLAINTEXT
987 fprintf(f, " plaintext");
994 fprintf(f, "Routers:");
996 fprintf(f, " accept");
998 #ifdef ROUTER_DNSLOOKUP
999 fprintf(f, " dnslookup");
1001 #ifdef ROUTER_IPLITERAL
1002 fprintf(f, " ipliteral");
1004 #ifdef ROUTER_IPLOOKUP
1005 fprintf(f, " iplookup");
1007 #ifdef ROUTER_MANUALROUTE
1008 fprintf(f, " manualroute");
1010 #ifdef ROUTER_QUERYPROGRAM
1011 fprintf(f, " queryprogram");
1013 #ifdef ROUTER_REDIRECT
1014 fprintf(f, " redirect");
1018 fprintf(f, "Transports:");
1019 #ifdef TRANSPORT_APPENDFILE
1020 fprintf(f, " appendfile");
1021 #ifdef SUPPORT_MAILDIR
1022 fprintf(f, "/maildir");
1024 #ifdef SUPPORT_MAILSTORE
1025 fprintf(f, "/mailstore");
1031 #ifdef TRANSPORT_AUTOREPLY
1032 fprintf(f, " autoreply");
1034 #ifdef TRANSPORT_LMTP
1035 fprintf(f, " lmtp");
1037 #ifdef TRANSPORT_PIPE
1038 fprintf(f, " pipe");
1040 #ifdef TRANSPORT_SMTP
1041 fprintf(f, " smtp");
1045 if (fixed_never_users[0] > 0)
1048 fprintf(f, "Fixed never_users: ");
1049 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1050 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1051 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1054 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1060 /*************************************************
1061 * Quote a local part *
1062 *************************************************/
1064 /* This function is used when a sender address or a From: or Sender: header
1065 line is being created from the caller's login, or from an authenticated_id. It
1066 applies appropriate quoting rules for a local part.
1068 Argument: the local part
1069 Returns: the local part, quoted if necessary
1073 local_part_quote(uschar *lpart)
1075 BOOL needs_quote = FALSE;
1080 for (t = lpart; !needs_quote && *t != 0; t++)
1082 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1083 (*t != '.' || t == lpart || t[1] == 0);
1086 if (!needs_quote) return lpart;
1089 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1093 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1096 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1099 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1100 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1101 yield = string_cat(yield, &size, &ptr, nq, 1);
1105 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1113 /*************************************************
1114 * Load readline() functions *
1115 *************************************************/
1117 /* This function is called from testing executions that read data from stdin,
1118 but only when running as the calling user. Currently, only -be does this. The
1119 function loads the readline() function library and passes back the functions.
1120 On some systems, it needs the curses library, so load that too, but try without
1121 it if loading fails. All this functionality has to be requested at build time.
1124 fn_readline_ptr pointer to where to put the readline pointer
1125 fn_addhist_ptr pointer to where to put the addhistory function
1127 Returns: the dlopen handle or NULL on failure
1131 set_readline(char * (**fn_readline_ptr)(char *),
1132 char * (**fn_addhist_ptr)(char *))
1135 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1137 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1138 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1140 if (dlhandle != NULL)
1142 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1143 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1147 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1156 /*************************************************
1157 * Get a line from stdin for testing things *
1158 *************************************************/
1160 /* This function is called when running tests that can take a number of lines
1161 of input (for example, -be and -bt). It handles continuations and trailing
1162 spaces. And prompting and a blank line output on eof. If readline() is in use,
1163 the arguments are non-NULL and provide the relevant functions.
1166 fn_readline readline function or NULL
1167 fn_addhist addhist function or NULL
1169 Returns: pointer to dynamic memory, or NULL at end of file
1173 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1178 uschar *yield = NULL;
1180 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1184 uschar buffer[1024];
1188 char *readline_line = NULL;
1189 if (fn_readline != NULL)
1191 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1192 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1193 p = US readline_line;
1198 /* readline() not in use */
1201 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1205 /* Handle the line */
1207 ss = p + (int)Ustrlen(p);
1208 while (ss > p && isspace(ss[-1])) ss--;
1212 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1215 yield = string_cat(yield, &size, &ptr, p, ss - p);
1218 if (fn_readline != NULL) free(readline_line);
1221 if (ss == p || yield[ptr-1] != '\\')
1229 if (yield == NULL) printf("\n");
1235 /*************************************************
1236 * Entry point and high-level code *
1237 *************************************************/
1239 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1240 the appropriate action. All the necessary functions are present in the one
1241 binary. I originally thought one should split it up, but it turns out that so
1242 much of the apparatus is needed in each chunk that one might as well just have
1243 it all available all the time, which then makes the coding easier as well.
1246 argc count of entries in argv
1247 argv argument strings, with argv[0] being the program name
1249 Returns: EXIT_SUCCESS if terminated successfully
1250 EXIT_FAILURE otherwise, except when a message has been sent
1251 to the sender, and -oee was given
1255 main(int argc, char **cargv)
1257 uschar **argv = USS cargv;
1258 int arg_receive_timeout = -1;
1259 int arg_smtp_receive_timeout = -1;
1260 int arg_error_handling = error_handling;
1261 int filter_sfd = -1;
1262 int filter_ufd = -1;
1265 int list_queue_option = 0;
1267 int msg_action_arg = -1;
1268 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1269 int queue_only_reason = 0;
1271 int perl_start_option = 0;
1273 int recipients_arg = argc;
1274 int sender_address_domain = 0;
1275 int test_retry_arg = -1;
1276 int test_rewrite_arg = -1;
1277 BOOL arg_queue_only = FALSE;
1278 BOOL bi_option = FALSE;
1279 BOOL checking = FALSE;
1280 BOOL count_queue = FALSE;
1281 BOOL expansion_test = FALSE;
1282 BOOL extract_recipients = FALSE;
1283 BOOL forced_delivery = FALSE;
1284 BOOL f_end_dot = FALSE;
1285 BOOL deliver_give_up = FALSE;
1286 BOOL list_queue = FALSE;
1287 BOOL list_options = FALSE;
1288 BOOL local_queue_only;
1290 BOOL one_msg_action = FALSE;
1291 BOOL queue_only_set = FALSE;
1292 BOOL receiving_message = TRUE;
1293 BOOL sender_ident_set = FALSE;
1294 BOOL session_local_queue_only;
1296 BOOL removed_privilege = FALSE;
1297 BOOL verify_address_mode = FALSE;
1298 BOOL verify_as_sender = FALSE;
1299 BOOL version_printed = FALSE;
1300 uschar *alias_arg = NULL;
1301 uschar *called_as = US"";
1302 uschar *start_queue_run_id = NULL;
1303 uschar *stop_queue_run_id = NULL;
1304 uschar *expansion_test_message = NULL;
1305 uschar *ftest_domain = NULL;
1306 uschar *ftest_localpart = NULL;
1307 uschar *ftest_prefix = NULL;
1308 uschar *ftest_suffix = NULL;
1309 uschar *real_sender_address;
1310 uschar *originator_home = US"/";
1314 struct stat statbuf;
1315 pid_t passed_qr_pid = (pid_t)0;
1316 int passed_qr_pipe = -1;
1317 gid_t group_list[NGROUPS_MAX];
1319 /* Possible options for -R and -S */
1321 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1323 /* Need to define this in case we need to change the environment in order
1324 to get rid of a bogus time zone. We have to make it char rather than uschar
1325 because some OS define it in /usr/include/unistd.h. */
1327 extern char **environ;
1329 /* If the Exim user and/or group and/or the configuration file owner/group were
1330 defined by ref:name at build time, we must now find the actual uid/gid values.
1331 This is a feature to make the lives of binary distributors easier. */
1333 #ifdef EXIM_USERNAME
1334 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1336 exim_gid = pw->pw_gid;
1340 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1346 #ifdef EXIM_GROUPNAME
1347 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1349 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1355 #ifdef CONFIGURE_OWNERNAME
1356 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1358 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1359 CONFIGURE_OWNERNAME);
1364 #ifdef CONFIGURE_GROUPNAME
1365 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1367 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1368 CONFIGURE_GROUPNAME);
1373 /* In the Cygwin environment, some initialization needs doing. It is fudged
1374 in by means of this macro. */
1380 /* Check a field which is patched when we are running Exim within its
1381 testing harness; do a fast initial check, and then the whole thing. */
1383 running_in_test_harness =
1384 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1386 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1387 at the start of a program; however, it seems that some environments do not
1388 follow this. A "strange" locale can affect the formatting of timestamps, so we
1391 setlocale(LC_ALL, "C");
1393 /* Set up the default handler for timing using alarm(). */
1395 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1397 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1398 because store_malloc writes a log entry on failure. */
1400 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1401 if (log_buffer == NULL)
1403 fprintf(stderr, "exim: failed to get store for log buffer\n");
1407 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1408 NULL when the daemon is run and the file is closed. We have to use this
1409 indirection, because some systems don't allow writing to the variable "stderr".
1412 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1414 /* Arrange for the PCRE regex library to use our store functions. Note that
1415 the normal calls are actually macros that add additional arguments for
1416 debugging purposes so we have to assign specially constructed functions here.
1417 The default is to use store in the stacking pool, but this is overridden in the
1418 regex_must_compile() function. */
1420 pcre_malloc = function_store_get;
1421 pcre_free = function_dummy_free;
1423 /* Ensure there is a big buffer for temporary use in several places. It is put
1424 in malloc store so that it can be freed for enlargement if necessary. */
1426 big_buffer = store_malloc(big_buffer_size);
1428 /* Set up the handler for the data request signal, and set the initial
1429 descriptive text. */
1431 set_process_info("initializing");
1432 os_restarting_signal(SIGUSR1, usr1_handler);
1434 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1435 in the daemon code. For the rest of Exim's uses, we ignore it. */
1437 signal(SIGHUP, SIG_IGN);
1439 /* We don't want to die on pipe errors as the code is written to handle
1440 the write error instead. */
1442 signal(SIGPIPE, SIG_IGN);
1444 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1445 set to SIG_IGN. This causes subprocesses that complete before the parent
1446 process waits for them not to hang around, so when Exim calls wait(), nothing
1447 is there. The wait() code has been made robust against this, but let's ensure
1448 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1449 ending status. We use sigaction rather than plain signal() on those OS where
1450 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1451 problem on AIX with this.) */
1455 struct sigaction act;
1456 act.sa_handler = SIG_DFL;
1457 sigemptyset(&(act.sa_mask));
1459 sigaction(SIGCHLD, &act, NULL);
1462 signal(SIGCHLD, SIG_DFL);
1465 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1470 /* Set up the version number. Set up the leading 'E' for the external form of
1471 message ids, set the pointer to the internal form, and initialize it to
1472 indicate no message being processed. */
1475 message_id_option[0] = '-';
1476 message_id_external = message_id_option + 1;
1477 message_id_external[0] = 'E';
1478 message_id = message_id_external + 1;
1481 /* Set the umask to zero so that any files Exim creates using open() are
1482 created with the modes that it specifies. NOTE: Files created with fopen() have
1483 a problem, which was not recognized till rather late (February 2006). With this
1484 umask, such files will be world writeable. (They are all content scanning files
1485 in the spool directory, which isn't world-accessible, so this is not a
1486 disaster, but it's untidy.) I don't want to change this overall setting,
1487 however, because it will interact badly with the open() calls. Instead, there's
1488 now a function called modefopen() that fiddles with the umask while calling
1493 /* Precompile the regular expression for matching a message id. Keep this in
1494 step with the code that generates ids in the accept.c module. We need to do
1495 this here, because the -M options check their arguments for syntactic validity
1496 using mac_ismsgid, which uses this. */
1499 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1501 /* Precompile the regular expression that is used for matching an SMTP error
1502 code, possibly extended, at the start of an error message. Note that the
1503 terminating whitespace character is included. */
1506 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1509 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1510 this seems to be a generally accepted convention, since one finds symbolic
1511 links called "mailq" in standard OS configurations. */
1513 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1514 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1517 receiving_message = FALSE;
1518 called_as = US"-mailq";
1521 /* If the program is called as "rmail" treat it as equivalent to
1522 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1523 i.e. preventing a single dot on a line from terminating the message, and
1524 returning with zero return code, even in cases of error (provided an error
1525 message has been sent). */
1527 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1528 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1531 called_as = US"-rmail";
1532 errors_sender_rc = EXIT_SUCCESS;
1535 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1536 this is a smail convention. */
1538 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1539 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1541 smtp_input = smtp_batched_input = TRUE;
1542 called_as = US"-rsmtp";
1545 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1546 this is a smail convention. */
1548 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1549 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1552 receiving_message = FALSE;
1553 called_as = US"-runq";
1556 /* If the program is called as "newaliases" treat it as equivalent to
1557 "exim -bi"; this is a sendmail convention. */
1559 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1560 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1563 receiving_message = FALSE;
1564 called_as = US"-newaliases";
1567 /* Save the original effective uid for a couple of uses later. It should
1568 normally be root, but in some esoteric environments it may not be. */
1570 original_euid = geteuid();
1572 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1573 to be the same as the real ones. This makes a difference only if Exim is setuid
1574 (or setgid) to something other than root, which could be the case in some
1575 special configurations. */
1577 real_uid = getuid();
1578 real_gid = getgid();
1580 if (real_uid == root_uid)
1586 /* If neither the original real uid nor the original euid was root, Exim is
1587 running in an unprivileged state. */
1589 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1591 /* If the first argument is --help, pretend there are no arguments. This will
1592 cause a brief message to be given. */
1594 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1596 /* Scan the program's arguments. Some can be dealt with right away; others are
1597 simply recorded for checking and handling afterwards. Do a high-level switch
1598 on the second character (the one after '-'), to save some effort. */
1600 for (i = 1; i < argc; i++)
1602 BOOL badarg = FALSE;
1603 uschar *arg = argv[i];
1607 /* An argument not starting with '-' is the start of a recipients list;
1608 break out of the options-scanning loop. */
1616 /* An option consistion of -- terminates the options */
1618 if (Ustrcmp(arg, "--") == 0)
1620 recipients_arg = i + 1;
1624 /* Handle flagged options */
1626 switchchar = arg[1];
1629 /* Make all -ex options synonymous with -oex arguments, since that
1630 is assumed by various callers. Also make -qR options synonymous with -R
1631 options, as that seems to be required as well. Allow for -qqR too, and
1632 the same for -S options. */
1634 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1635 Ustrncmp(arg+1, "qR", 2) == 0 ||
1636 Ustrncmp(arg+1, "qS", 2) == 0)
1638 switchchar = arg[2];
1641 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1643 switchchar = arg[3];
1645 queue_2stage = TRUE;
1648 /* Make -r synonymous with -f, since it is a documented alias */
1650 else if (arg[1] == 'r') switchchar = 'f';
1652 /* Make -ov synonymous with -v */
1654 else if (Ustrcmp(arg, "-ov") == 0)
1660 /* High-level switch on active initial letter */
1664 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1665 so has no need of it. */
1668 if (*argrest == 0) i++; /* Skip over the type */
1673 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1675 /* -bd: Run in daemon mode, awaiting SMTP connections.
1676 -bdf: Ditto, but in the foreground.
1679 if (*argrest == 'd')
1681 daemon_listen = TRUE;
1682 if (*(++argrest) == 'f') background_daemon = FALSE;
1683 else if (*argrest != 0) { badarg = TRUE; break; }
1686 /* -be: Run in expansion test mode
1687 -bem: Ditto, but read a message from a file first
1690 else if (*argrest == 'e')
1692 expansion_test = checking = TRUE;
1693 if (argrest[1] == 'm')
1695 if (++i >= argc) { badarg = TRUE; break; }
1696 expansion_test_message = argv[i];
1699 if (argrest[1] != 0) { badarg = TRUE; break; }
1702 /* -bF: Run system filter test */
1704 else if (*argrest == 'F')
1706 filter_test |= FTEST_SYSTEM;
1707 if (*(++argrest) != 0) { badarg = TRUE; break; }
1708 if (++i < argc) filter_test_sfile = argv[i]; else
1710 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1715 /* -bf: Run user filter test
1716 -bfd: Set domain for filter testing
1717 -bfl: Set local part for filter testing
1718 -bfp: Set prefix for filter testing
1719 -bfs: Set suffix for filter testing
1722 else if (*argrest == 'f')
1724 if (*(++argrest) == 0)
1726 filter_test |= FTEST_USER;
1727 if (++i < argc) filter_test_ufile = argv[i]; else
1729 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1737 fprintf(stderr, "exim: string expected after %s\n", arg);
1740 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1741 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1742 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1743 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1744 else { badarg = TRUE; break; }
1748 /* -bh: Host checking - an IP address must follow. */
1750 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1752 if (++i >= argc) { badarg = TRUE; break; }
1753 sender_host_address = argv[i];
1754 host_checking = checking = log_testing_mode = TRUE;
1755 host_checking_callout = argrest[1] == 'c';
1758 /* -bi: This option is used by sendmail to initialize *the* alias file,
1759 though it has the -oA option to specify a different file. Exim has no
1760 concept of *the* alias file, but since Sun's YP make script calls
1761 sendmail this way, some support must be provided. */
1763 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1765 /* -bm: Accept and deliver message - the default option. Reinstate
1766 receiving_message, which got turned off for all -b options. */
1768 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1770 /* -bnq: For locally originating messages, do not qualify unqualified
1771 addresses. In the envelope, this causes errors; in header lines they
1774 else if (Ustrcmp(argrest, "nq") == 0)
1776 allow_unqualified_sender = FALSE;
1777 allow_unqualified_recipient = FALSE;
1780 /* -bpxx: List the contents of the mail queue, in various forms. If
1781 the option is -bpc, just a queue count is needed. Otherwise, if the
1782 first letter after p is r, then order is random. */
1784 else if (*argrest == 'p')
1786 if (*(++argrest) == 'c')
1789 if (*(++argrest) != 0) badarg = TRUE;
1793 if (*argrest == 'r')
1795 list_queue_option = 8;
1798 else list_queue_option = 0;
1802 /* -bp: List the contents of the mail queue, top-level only */
1804 if (*argrest == 0) {}
1806 /* -bpu: List the contents of the mail queue, top-level undelivered */
1808 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1810 /* -bpa: List the contents of the mail queue, including all delivered */
1812 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1814 /* Unknown after -bp[r] */
1824 /* -bP: List the configuration variables given as the address list.
1825 Force -v, so configuration errors get displayed. */
1827 else if (Ustrcmp(argrest, "P") == 0)
1829 list_options = TRUE;
1830 debug_selector |= D_v;
1831 debug_file = stderr;
1834 /* -brt: Test retry configuration lookup */
1836 else if (Ustrcmp(argrest, "rt") == 0)
1838 test_retry_arg = i + 1;
1842 /* -brw: Test rewrite configuration */
1844 else if (Ustrcmp(argrest, "rw") == 0)
1846 test_rewrite_arg = i + 1;
1850 /* -bS: Read SMTP commands on standard input, but produce no replies -
1851 all errors are reported by sending messages. */
1853 else if (Ustrcmp(argrest, "S") == 0)
1854 smtp_input = smtp_batched_input = receiving_message = TRUE;
1856 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1857 on standard output. */
1859 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1861 /* -bt: address testing mode */
1863 else if (Ustrcmp(argrest, "t") == 0)
1864 address_test_mode = checking = log_testing_mode = TRUE;
1866 /* -bv: verify addresses */
1868 else if (Ustrcmp(argrest, "v") == 0)
1869 verify_address_mode = checking = log_testing_mode = TRUE;
1871 /* -bvs: verify sender addresses */
1873 else if (Ustrcmp(argrest, "vs") == 0)
1875 verify_address_mode = checking = log_testing_mode = TRUE;
1876 verify_as_sender = TRUE;
1879 /* -bV: Print version string and support details */
1881 else if (Ustrcmp(argrest, "V") == 0)
1883 printf("Exim version %s #%s built %s\n", version_string,
1884 version_cnumber, version_date);
1885 printf("%s\n", CS version_copyright);
1886 version_printed = TRUE;
1887 show_whats_supported(stdout);
1894 /* -C: change configuration file list; ignore if it isn't really
1895 a change! Enforce a prefix check if required. */
1900 if(++i < argc) argrest = argv[i]; else
1901 { badarg = TRUE; break; }
1903 if (Ustrcmp(config_main_filelist, argrest) != 0)
1905 #ifdef ALT_CONFIG_PREFIX
1907 int len = Ustrlen(ALT_CONFIG_PREFIX);
1908 uschar *list = argrest;
1910 while((filename = string_nextinlist(&list, &sep, big_buffer,
1911 big_buffer_size)) != NULL)
1913 if ((Ustrlen(filename) < len ||
1914 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1915 Ustrstr(filename, "/../") != NULL) &&
1916 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1918 fprintf(stderr, "-C Permission denied\n");
1924 config_main_filelist = argrest;
1925 config_changed = TRUE;
1930 /* -D: set up a macro definition */
1933 #ifdef DISABLE_D_OPTION
1934 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1939 macro_item *mlast = NULL;
1942 uschar *s = argrest;
1944 while (isspace(*s)) s++;
1946 if (*s < 'A' || *s > 'Z')
1948 fprintf(stderr, "exim: macro name set by -D must start with "
1949 "an upper case letter\n");
1953 while (isalnum(*s) || *s == '_')
1955 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1959 if (ptr == 0) { badarg = TRUE; break; }
1960 while (isspace(*s)) s++;
1963 if (*s++ != '=') { badarg = TRUE; break; }
1964 while (isspace(*s)) s++;
1967 for (m = macros; m != NULL; m = m->next)
1969 if (Ustrcmp(m->name, name) == 0)
1971 fprintf(stderr, "exim: duplicated -D in command line\n");
1977 m = store_get(sizeof(macro_item) + Ustrlen(name));
1979 m->command_line = TRUE;
1980 if (mlast == NULL) macros = m; else mlast->next = m;
1981 Ustrcpy(m->name, name);
1982 m->replacement = string_copy(s);
1984 if (clmacro_count >= MAX_CLMACROS)
1986 fprintf(stderr, "exim: too many -D options on command line\n");
1989 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1995 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1996 The latter is now a no-op, retained for compatibility only. If -dd is used,
1997 debugging subprocesses of the daemon is disabled. */
2000 if (Ustrcmp(argrest, "ropcr") == 0)
2002 /* drop_cr = TRUE; */
2005 /* Use an intermediate variable so that we don't set debugging while
2006 decoding the debugging bits. */
2010 unsigned int selector = D_default;
2013 if (*argrest == 'd')
2015 debug_daemon = TRUE;
2019 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2020 debug_options_count, US"debug");
2021 debug_selector = selector;
2026 /* -E: This is a local error message. This option is not intended for
2027 external use at all, but is not restricted to trusted callers because it
2028 does no harm (just suppresses certain error messages) and if Exim is run
2029 not setuid root it won't always be trusted when it generates error
2030 messages using this option. If there is a message id following -E, point
2031 message_reference at it, for logging. */
2034 local_error_message = TRUE;
2035 if (mac_ismsgid(argrest)) message_reference = argrest;
2039 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2040 option, so it looks as if historically the -oex options are also callable
2041 without the leading -o. So we have to accept them. Before the switch,
2042 anything starting -oe has been converted to -e. Exim does not support all
2043 of the sendmail error options. */
2046 if (Ustrcmp(argrest, "e") == 0)
2048 arg_error_handling = ERRORS_SENDER;
2049 errors_sender_rc = EXIT_SUCCESS;
2051 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2052 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2053 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2054 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2059 /* -F: Set sender's full name, used instead of the gecos entry from
2060 the password file. Since users can usually alter their gecos entries,
2061 there's no security involved in using this instead. The data can follow
2062 the -F or be in the next argument. */
2067 if(++i < argc) argrest = argv[i]; else
2068 { badarg = TRUE; break; }
2070 originator_name = argrest;
2071 sender_name_forced = TRUE;
2075 /* -f: Set sender's address - this value is only actually used if Exim is
2076 run by a trusted user, or if untrusted_set_sender is set and matches the
2077 address, except that the null address can always be set by any user. The
2078 test for this happens later, when the value given here is ignored when not
2079 permitted. For an untrusted user, the actual sender is still put in Sender:
2080 if it doesn't match the From: header (unless no_local_from_check is set).
2081 The data can follow the -f or be in the next argument. The -r switch is an
2082 obsolete form of -f but since there appear to be programs out there that
2083 use anything that sendmail has ever supported, better accept it - the
2084 synonymizing is done before the switch above.
2086 At this stage, we must allow domain literal addresses, because we don't
2087 know what the setting of allow_domain_literals is yet. Ditto for trailing
2088 dots and strip_trailing_dot. */
2096 if (i+1 < argc) argrest = argv[++i]; else
2097 { badarg = TRUE; break; }
2101 sender_address = string_sprintf(""); /* Ensure writeable memory */
2105 uschar *temp = argrest + Ustrlen(argrest) - 1;
2106 while (temp >= argrest && isspace(*temp)) temp--;
2107 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2108 allow_domain_literals = TRUE;
2109 strip_trailing_dot = TRUE;
2110 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2111 &sender_address_domain, TRUE);
2112 allow_domain_literals = FALSE;
2113 strip_trailing_dot = FALSE;
2114 if (sender_address == NULL)
2116 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2117 return EXIT_FAILURE;
2120 sender_address_forced = TRUE;
2124 /* This is some Sendmail thing which can be ignored */
2129 /* -h: Set the hop count for an incoming message. Exim does not currently
2130 support this; it always computes it by counting the Received: headers.
2131 To put it in will require a change to the spool header file format. */
2136 if(++i < argc) argrest = argv[i]; else
2137 { badarg = TRUE; break; }
2139 if (!isdigit(*argrest)) badarg = TRUE;
2143 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2144 not to be documented for sendmail but mailx (at least) uses it) */
2147 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2152 receiving_message = FALSE;
2154 /* -MC: continue delivery of another message via an existing open
2155 file descriptor. This option is used for an internal call by the
2156 smtp transport when there is a pending message waiting to go to an
2157 address to which it has got a connection. Five subsequent arguments are
2158 required: transport name, host name, IP address, sequence number, and
2159 message_id. Transports may decline to create new processes if the sequence
2160 number gets too big. The channel is stdin. This (-MC) must be the last
2161 argument. There's a subsequent check that the real-uid is privileged.
2163 If we are running in the test harness. delay for a bit, to let the process
2164 that set this one up complete. This makes for repeatability of the logging,
2167 if (Ustrcmp(argrest, "C") == 0)
2169 union sockaddr_46 interface_sock;
2170 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2174 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2175 return EXIT_FAILURE;
2178 if (msg_action_arg >= 0)
2180 fprintf(stderr, "exim: incompatible arguments\n");
2181 return EXIT_FAILURE;
2184 continue_transport = argv[++i];
2185 continue_hostname = argv[++i];
2186 continue_host_address = argv[++i];
2187 continue_sequence = Uatoi(argv[++i]);
2188 msg_action = MSG_DELIVER;
2189 msg_action_arg = ++i;
2190 forced_delivery = TRUE;
2191 queue_run_pid = passed_qr_pid;
2192 queue_run_pipe = passed_qr_pipe;
2194 if (!mac_ismsgid(argv[i]))
2196 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2198 return EXIT_FAILURE;
2201 /* Set up $sending_ip_address and $sending_port */
2203 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2205 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2209 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2211 return EXIT_FAILURE;
2214 if (running_in_test_harness) millisleep(500);
2218 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2219 precedes -MC (see above). The flag indicates that the host to which
2220 Exim is connected has accepted an AUTH sequence. */
2222 else if (Ustrcmp(argrest, "CA") == 0)
2224 smtp_authenticated = TRUE;
2228 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2229 it preceded -MC (see above) */
2231 else if (Ustrcmp(argrest, "CP") == 0)
2233 smtp_use_pipelining = TRUE;
2237 /* -MCQ: pass on the pid of the queue-running process that started
2238 this chain of deliveries and the fd of its synchronizing pipe; this
2239 is useful only when it precedes -MC (see above) */
2241 else if (Ustrcmp(argrest, "CQ") == 0)
2243 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2245 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2250 /* -MCS: set the smtp_use_size flag; this is useful only when it
2251 precedes -MC (see above) */
2253 else if (Ustrcmp(argrest, "CS") == 0)
2255 smtp_use_size = TRUE;
2259 /* -MCT: set the tls_offered flag; this is useful only when it
2260 precedes -MC (see above). The flag indicates that the host to which
2261 Exim is connected has offered TLS support. */
2264 else if (Ustrcmp(argrest, "CT") == 0)
2271 /* -M[x]: various operations on the following list of message ids:
2272 -M deliver the messages, ignoring next retry times and thawing
2273 -Mc deliver the messages, checking next retry times, no thawing
2274 -Mf freeze the messages
2275 -Mg give up on the messages
2276 -Mt thaw the messages
2277 -Mrm remove the messages
2278 In the above cases, this must be the last option. There are also the
2279 following options which are followed by a single message id, and which
2280 act on that message. Some of them use the "recipient" addresses as well.
2281 -Mar add recipient(s)
2282 -Mmad mark all recipients delivered
2283 -Mmd mark recipients(s) delivered
2285 -Mset load a message for use with -be
2287 -Mvc show copy (of whole message, in RFC 2822 format)
2292 else if (*argrest == 0)
2294 msg_action = MSG_DELIVER;
2295 forced_delivery = deliver_force_thaw = TRUE;
2297 else if (Ustrcmp(argrest, "ar") == 0)
2299 msg_action = MSG_ADD_RECIPIENT;
2300 one_msg_action = TRUE;
2302 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2303 else if (Ustrcmp(argrest, "es") == 0)
2305 msg_action = MSG_EDIT_SENDER;
2306 one_msg_action = TRUE;
2308 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2309 else if (Ustrcmp(argrest, "g") == 0)
2311 msg_action = MSG_DELIVER;
2312 deliver_give_up = TRUE;
2314 else if (Ustrcmp(argrest, "mad") == 0)
2316 msg_action = MSG_MARK_ALL_DELIVERED;
2318 else if (Ustrcmp(argrest, "md") == 0)
2320 msg_action = MSG_MARK_DELIVERED;
2321 one_msg_action = TRUE;
2323 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2324 else if (Ustrcmp(argrest, "set") == 0)
2326 msg_action = MSG_LOAD;
2327 one_msg_action = TRUE;
2329 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2330 else if (Ustrcmp(argrest, "vb") == 0)
2332 msg_action = MSG_SHOW_BODY;
2333 one_msg_action = TRUE;
2335 else if (Ustrcmp(argrest, "vc") == 0)
2337 msg_action = MSG_SHOW_COPY;
2338 one_msg_action = TRUE;
2340 else if (Ustrcmp(argrest, "vh") == 0)
2342 msg_action = MSG_SHOW_HEADER;
2343 one_msg_action = TRUE;
2345 else if (Ustrcmp(argrest, "vl") == 0)
2347 msg_action = MSG_SHOW_LOG;
2348 one_msg_action = TRUE;
2350 else { badarg = TRUE; break; }
2352 /* All the -Mxx options require at least one message id. */
2354 msg_action_arg = i + 1;
2355 if (msg_action_arg >= argc)
2357 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2358 return EXIT_FAILURE;
2361 /* Some require only message ids to follow */
2363 if (!one_msg_action)
2366 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2368 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2370 return EXIT_FAILURE;
2372 goto END_ARG; /* Remaining args are ids */
2375 /* Others require only one message id, possibly followed by addresses,
2376 which will be handled as normal arguments. */
2380 if (!mac_ismsgid(argv[msg_action_arg]))
2382 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2383 argv[msg_action_arg], arg);
2384 return EXIT_FAILURE;
2391 /* Some programs seem to call the -om option without the leading o;
2392 for sendmail it askes for "me too". Exim always does this. */
2395 if (*argrest != 0) badarg = TRUE;
2399 /* -N: don't do delivery - a debugging option that stops transports doing
2400 their thing. It implies debugging at the D_v level. */
2405 dont_deliver = TRUE;
2406 debug_selector |= D_v;
2407 debug_file = stderr;
2413 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2419 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2420 option to the specified value. This form uses long names. We need to handle
2421 -O option=value and -Ooption=value. */
2428 fprintf(stderr, "exim: string expected after -O\n");
2436 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2439 if (*argrest == 'A')
2441 alias_arg = argrest + 1;
2442 if (alias_arg[0] == 0)
2444 if (i+1 < argc) alias_arg = argv[++i]; else
2446 fprintf(stderr, "exim: string expected after -oA\n");
2452 /* -oB: Set a connection message max value for remote deliveries */
2454 else if (*argrest == 'B')
2456 uschar *p = argrest + 1;
2459 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2461 connection_max_messages = 1;
2470 fprintf(stderr, "exim: number expected after -oB\n");
2473 connection_max_messages = Uatoi(p);
2477 /* -odb: background delivery */
2479 else if (Ustrcmp(argrest, "db") == 0)
2481 synchronous_delivery = FALSE;
2482 arg_queue_only = FALSE;
2483 queue_only_set = TRUE;
2486 /* -odf: foreground delivery (smail-compatible option); same effect as
2487 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2490 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2492 synchronous_delivery = TRUE;
2493 arg_queue_only = FALSE;
2494 queue_only_set = TRUE;
2497 /* -odq: queue only */
2499 else if (Ustrcmp(argrest, "dq") == 0)
2501 synchronous_delivery = FALSE;
2502 arg_queue_only = TRUE;
2503 queue_only_set = TRUE;
2506 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2507 but no remote delivery */
2509 else if (Ustrcmp(argrest, "dqs") == 0)
2512 arg_queue_only = FALSE;
2513 queue_only_set = TRUE;
2516 /* -oex: Sendmail error flags. As these are also accepted without the
2517 leading -o prefix, for compatibility with vacation and other callers,
2518 they are handled with -e above. */
2520 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2521 -oitrue: Another sendmail syntax for the same */
2523 else if (Ustrcmp(argrest, "i") == 0 ||
2524 Ustrcmp(argrest, "itrue") == 0)
2527 /* -oM*: Set various characteristics for an incoming message; actually
2528 acted on for trusted callers only. */
2530 else if (*argrest == 'M')
2534 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2538 /* -oMa: Set sender host address */
2540 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2542 /* -oMaa: Set authenticator name */
2544 else if (Ustrcmp(argrest, "Maa") == 0)
2545 sender_host_authenticated = argv[++i];
2547 /* -oMas: setting authenticated sender */
2549 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2551 /* -oMai: setting authenticated id */
2553 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2555 /* -oMi: Set incoming interface address */
2557 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2559 /* -oMr: Received protocol */
2561 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2563 /* -oMs: Set sender host name */
2565 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2567 /* -oMt: Set sender ident */
2569 else if (Ustrcmp(argrest, "Mt") == 0)
2571 sender_ident_set = TRUE;
2572 sender_ident = argv[++i];
2575 /* Else a bad argument */
2584 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2585 seem to call this as -m (undocumented), so that is also accepted (see
2588 else if (Ustrcmp(argrest, "m") == 0) {}
2590 /* -oo: An ancient flag for old-style addresses which still seems to
2591 crop up in some calls (see in SCO). */
2593 else if (Ustrcmp(argrest, "o") == 0) {}
2595 /* -oP <name>: set pid file path for daemon */
2597 else if (Ustrcmp(argrest, "P") == 0)
2598 override_pid_file_path = argv[++i];
2600 /* -or <n>: set timeout for non-SMTP acceptance
2601 -os <n>: set timeout for SMTP acceptance */
2603 else if (*argrest == 'r' || *argrest == 's')
2605 int *tp = (*argrest == 'r')?
2606 &arg_receive_timeout : &arg_smtp_receive_timeout;
2607 if (argrest[1] == 0)
2609 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2611 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2614 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2619 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2621 else if (Ustrcmp(argrest, "X") == 0)
2622 override_local_interfaces = argv[++i];
2624 /* Unknown -o argument */
2630 /* -ps: force Perl startup; -pd force delayed Perl startup */
2634 if (*argrest == 's' && argrest[1] == 0)
2636 perl_start_option = 1;
2639 if (*argrest == 'd' && argrest[1] == 0)
2641 perl_start_option = -1;
2646 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2647 which sets the host protocol and host name */
2651 if (i+1 < argc) argrest = argv[++i]; else
2652 { badarg = TRUE; break; }
2657 uschar *hn = Ustrchr(argrest, ':');
2660 received_protocol = argrest;
2664 received_protocol = string_copyn(argrest, hn - argrest);
2665 sender_host_name = hn + 1;
2672 receiving_message = FALSE;
2673 if (queue_interval >= 0)
2675 fprintf(stderr, "exim: -q specified more than once\n");
2679 /* -qq...: Do queue runs in a 2-stage manner */
2681 if (*argrest == 'q')
2683 queue_2stage = TRUE;
2687 /* -qi...: Do only first (initial) deliveries */
2689 if (*argrest == 'i')
2691 queue_run_first_delivery = TRUE;
2695 /* -qf...: Run the queue, forcing deliveries
2696 -qff..: Ditto, forcing thawing as well */
2698 if (*argrest == 'f')
2700 queue_run_force = TRUE;
2701 if (*(++argrest) == 'f')
2703 deliver_force_thaw = TRUE;
2708 /* -q[f][f]l...: Run the queue only on local deliveries */
2710 if (*argrest == 'l')
2712 queue_run_local = TRUE;
2716 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2717 optionally starting from a given message id. */
2719 if (*argrest == 0 &&
2720 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2723 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2724 start_queue_run_id = argv[++i];
2725 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2726 stop_queue_run_id = argv[++i];
2729 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2730 optionally local only. */
2735 queue_interval = readconf_readtime(argrest, 0, FALSE);
2737 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2738 if (queue_interval <= 0)
2740 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2747 case 'R': /* Synonymous with -qR... */
2748 receiving_message = FALSE;
2750 /* -Rf: As -R (below) but force all deliveries,
2751 -Rff: Ditto, but also thaw all frozen messages,
2752 -Rr: String is regex
2753 -Rrf: Regex and force
2754 -Rrff: Regex and force and thaw
2756 in all cases provided there are no further characters in this
2762 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2764 if (Ustrcmp(argrest, rsopts[i]) == 0)
2766 if (i != 2) queue_run_force = TRUE;
2767 if (i >= 2) deliver_selectstring_regex = TRUE;
2768 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2769 argrest += Ustrlen(rsopts[i]);
2774 /* -R: Set string to match in addresses for forced queue run to
2775 pick out particular messages. */
2779 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2781 fprintf(stderr, "exim: string expected after -R\n");
2785 else deliver_selectstring = argrest;
2789 /* -r: an obsolete synonym for -f (see above) */
2792 /* -S: Like -R but works on sender. */
2794 case 'S': /* Synonymous with -qS... */
2795 receiving_message = FALSE;
2797 /* -Sf: As -S (below) but force all deliveries,
2798 -Sff: Ditto, but also thaw all frozen messages,
2799 -Sr: String is regex
2800 -Srf: Regex and force
2801 -Srff: Regex and force and thaw
2803 in all cases provided there are no further characters in this
2809 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2811 if (Ustrcmp(argrest, rsopts[i]) == 0)
2813 if (i != 2) queue_run_force = TRUE;
2814 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2815 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2816 argrest += Ustrlen(rsopts[i]);
2821 /* -S: Set string to match in addresses for forced queue run to
2822 pick out particular messages. */
2826 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2828 fprintf(stderr, "exim: string expected after -S\n");
2832 else deliver_selectstring_sender = argrest;
2835 /* -Tqt is an option that is exclusively for use by the testing suite.
2836 It is not recognized in other circumstances. It allows for the setting up
2837 of explicit "queue times" so that various warning/retry things can be
2838 tested. Otherwise variability of clock ticks etc. cause problems. */
2841 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2842 fudged_queue_times = argv[++i];
2847 /* -t: Set flag to extract recipients from body of message. */
2850 if (*argrest == 0) extract_recipients = TRUE;
2852 /* -ti: Set flag to extract recipients from body of message, and also
2853 specify that dot does not end the message. */
2855 else if (Ustrcmp(argrest, "i") == 0)
2857 extract_recipients = TRUE;
2861 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2864 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2871 /* -U: This means "initial user submission" in sendmail, apparently. The
2872 doc claims that in future sendmail may refuse syntactically invalid
2873 messages instead of fixing them. For the moment, we just ignore it. */
2879 /* -v: verify things - this is a very low-level debugging */
2884 debug_selector |= D_v;
2885 debug_file = stderr;
2891 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2893 The -x flag tells the sendmail command that mail from a local
2894 mail program has National Language Support (NLS) extended characters
2895 in the body of the mail item. The sendmail command can send mail with
2896 extended NLS characters across networks that normally corrupts these
2899 As Exim is 8-bit clean, it just ignores this flag. */
2902 if (*argrest != 0) badarg = TRUE;
2905 /* All other initial characters are errors */
2910 } /* End of high-level switch statement */
2912 /* Failed to recognize the option, or syntax error */
2916 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2917 "option %s\n", arg);
2923 /* If -R or -S have been specified without -q, assume a single queue run. */
2925 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2926 queue_interval < 0) queue_interval = 0;
2929 /* Arguments have been processed. Check for incompatibilities. */
2933 (smtp_input || extract_recipients || recipients_arg < argc) &&
2934 (daemon_listen || queue_interval >= 0 || bi_option ||
2935 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2936 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2939 msg_action_arg > 0 &&
2940 (daemon_listen || queue_interval >= 0 || list_options ||
2941 (checking && msg_action != MSG_LOAD) ||
2942 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2945 (daemon_listen || queue_interval >= 0) &&
2946 (sender_address != NULL || list_options || list_queue || checking ||
2950 daemon_listen && queue_interval == 0
2954 (checking || smtp_input || extract_recipients ||
2955 filter_test != FTEST_NONE || bi_option)
2958 verify_address_mode &&
2959 (address_test_mode || smtp_input || extract_recipients ||
2960 filter_test != FTEST_NONE || bi_option)
2963 address_test_mode && (smtp_input || extract_recipients ||
2964 filter_test != FTEST_NONE || bi_option)
2967 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2971 deliver_selectstring != NULL && queue_interval < 0
2974 msg_action == MSG_LOAD &&
2975 (!expansion_test || expansion_test_message != NULL)
2979 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2983 /* If debugging is set up, set the file and the file descriptor to pass on to
2984 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2985 to run in the foreground. */
2987 if (debug_selector != 0)
2989 debug_file = stderr;
2990 debug_fd = fileno(debug_file);
2991 background_daemon = FALSE;
2992 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2993 if (debug_selector != D_v) /* -v only doesn't show this */
2995 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2996 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2998 show_whats_supported(stderr);
3002 /* When started with root privilege, ensure that the limits on the number of
3003 open files and the number of processes (where that is accessible) are
3004 sufficiently large, or are unset, in case Exim has been called from an
3005 environment where the limits are screwed down. Not all OS have the ability to
3006 change some of these limits. */
3010 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3016 #ifdef RLIMIT_NOFILE
3017 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3019 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3021 rlp.rlim_cur = rlp.rlim_max = 0;
3024 /* I originally chose 1000 as a nice big number that was unlikely to
3025 be exceeded. It turns out that some older OS have a fixed upper limit of
3028 if (rlp.rlim_cur < 1000)
3030 rlp.rlim_cur = rlp.rlim_max = 1000;
3031 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3033 rlp.rlim_cur = rlp.rlim_max = 256;
3034 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3035 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3042 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3044 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3046 rlp.rlim_cur = rlp.rlim_max = 0;
3049 #ifdef RLIM_INFINITY
3050 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3052 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3054 if (rlp.rlim_cur < 1000)
3056 rlp.rlim_cur = rlp.rlim_max = 1000;
3058 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3059 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3065 /* Exim is normally entered as root (but some special configurations are
3066 possible that don't do this). However, it always spins off sub-processes that
3067 set their uid and gid as required for local delivery. We don't want to pass on
3068 any extra groups that root may belong to, so we want to get rid of them all at
3071 We need to obey setgroups() at this stage, before possibly giving up root
3072 privilege for a changed configuration file, but later on we might need to
3073 check on the additional groups for the admin user privilege - can't do that
3074 till after reading the config, which might specify the exim gid. Therefore,
3075 save the group list here first. */
3077 group_count = getgroups(NGROUPS_MAX, group_list);
3079 /* There is a fundamental difference in some BSD systems in the matter of
3080 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3081 known not to be different. On the "different" systems there is a single group
3082 list, and the first entry in it is the current group. On all other versions of
3083 Unix there is a supplementary group list, which is in *addition* to the current
3084 group. Consequently, to get rid of all extraneous groups on a "standard" system
3085 you pass over 0 groups to setgroups(), while on a "different" system you pass
3086 over a single group - the current group, which is always the first group in the
3087 list. Calling setgroups() with zero groups on a "different" system results in
3088 an error return. The following code should cope with both types of system.
3090 However, if this process isn't running as root, setgroups() can't be used
3091 since you have to be root to run it, even if throwing away groups. Not being
3092 root here happens only in some unusual configurations. We just ignore the
3095 if (setgroups(0, NULL) != 0)
3097 if (setgroups(1, group_list) != 0 && !unprivileged)
3099 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3104 /* If the configuration file name has been altered by an argument on the
3105 command line (either a new file name or a macro definition) and the caller is
3106 not root or the exim user, or if this is a filter testing run, remove any
3107 setuid privilege the program has, and run as the underlying user.
3109 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3110 severely restricts the use of -C for some purposes.
3112 Otherwise, set the real ids to the effective values (should be root unless run
3113 from inetd, which it can either be root or the exim uid, if one is configured).
3115 There is a private mechanism for bypassing some of this, in order to make it
3116 possible to test lots of configurations automatically, without having either to
3117 recompile each time, or to patch in an actual configuration file name and other
3118 values (such as the path name). If running in the test harness, pretend that
3119 configuration file changes and macro definitions haven't happened. */
3122 (config_changed || macros != NULL) && /* Config changed, and */
3123 real_uid != root_uid && /* Not root, and */
3124 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3125 real_uid != exim_uid && /* Not exim, and */
3127 !running_in_test_harness /* Not fudged */
3129 expansion_test /* expansion testing */
3131 filter_test != FTEST_NONE) /* Filter testing */
3133 setgroups(group_count, group_list);
3134 exim_setugid(real_uid, real_gid, FALSE,
3135 US"-C, -D, -be or -bf forces real uid");
3136 removed_privilege = TRUE;
3138 /* In the normal case when Exim is called like this, stderr is available
3139 and should be used for any logging information because attempts to write
3140 to the log will usually fail. To arrange this, we unset really_exim. However,
3141 if no stderr is available there is no point - we might as well have a go
3142 at the log (if it fails, syslog will be written). */
3144 if (log_stderr != NULL) really_exim = FALSE;
3147 /* Privilege is to be retained for the moment. It may be dropped later,
3148 depending on the job that this Exim process has been asked to do. For now, set
3149 the real uid to the effective so that subsequent re-execs of Exim are done by a
3152 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3154 /* If testing a filter, open the file(s) now, before wasting time doing other
3155 setups and reading the message. */
3157 if ((filter_test & FTEST_SYSTEM) != 0)
3159 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3162 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3164 return EXIT_FAILURE;
3168 if ((filter_test & FTEST_USER) != 0)
3170 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3173 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3175 return EXIT_FAILURE;
3179 /* Read the main runtime configuration data; this gives up if there
3180 is a failure. It leaves the configuration file open so that the subsequent
3181 configuration data for delivery can be read if needed. */
3185 /* Handle the decoding of logging options. */
3187 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3188 log_options, log_options_count, US"log");
3192 debug_printf("configuration file is %s\n", config_main_filename);
3193 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3194 log_extra_selector);
3197 /* If domain literals are not allowed, check the sender address that was
3198 supplied with -f. Ditto for a stripped trailing dot. */
3200 if (sender_address != NULL)
3202 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3204 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3205 "allowed\n", sender_address);
3206 return EXIT_FAILURE;
3208 if (f_end_dot && !strip_trailing_dot)
3210 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3211 "(trailing dot not allowed)\n", sender_address);
3212 return EXIT_FAILURE;
3216 /* Paranoia check of maximum lengths of certain strings. There is a check
3217 on the length of the log file path in log.c, which will come into effect
3218 if there are any calls to write the log earlier than this. However, if we
3219 get this far but the string is very long, it is better to stop now than to
3220 carry on and (e.g.) receive a message and then have to collapse. The call to
3221 log_write() from here will cause the ultimate panic collapse if the complete
3222 file name exceeds the buffer length. */
3224 if (Ustrlen(log_file_path) > 200)
3225 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3226 "log_file_path is longer than 200 chars: aborting");
3228 if (Ustrlen(pid_file_path) > 200)
3229 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3230 "pid_file_path is longer than 200 chars: aborting");
3232 if (Ustrlen(spool_directory) > 200)
3233 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3234 "spool_directory is longer than 200 chars: aborting");
3236 /* Length check on the process name given to syslog for its TAG field,
3237 which is only permitted to be 32 characters or less. See RFC 3164. */
3239 if (Ustrlen(syslog_processname) > 32)
3240 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3241 "syslog_processname is longer than 32 chars: aborting");
3243 /* In some operating systems, the environment variable TMPDIR controls where
3244 temporary files are created; Exim doesn't use these (apart from when delivering
3245 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3246 If TMPDIR is found in the environment, reset it to the value defined in the
3247 TMPDIR macro, if this macro is defined. */
3252 for (p = USS environ; *p != NULL; p++)
3254 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3255 Ustrcmp(*p+7, TMPDIR) != 0)
3257 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3258 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3260 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3266 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3267 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3268 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3269 called by a user who has set the TZ variable. This then affects the timestamps
3270 in log files and in Received: headers, and any created Date: header lines. The
3271 required timezone is settable in the configuration file, so nothing can be done
3272 about this earlier - but hopefully nothing will normally be logged earlier than
3273 this. We have to make a new environment if TZ is wrong, but don't bother if
3274 timestamps_utc is set, because then all times are in UTC anyway. */
3276 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3278 timestamps_utc = TRUE;
3282 uschar *envtz = US getenv("TZ");
3283 if ((envtz == NULL && timezone_string != NULL) ||
3285 (timezone_string == NULL ||
3286 Ustrcmp(timezone_string, envtz) != 0)))
3288 uschar **p = USS environ;
3292 while (*p++ != NULL) count++;
3293 if (envtz == NULL) count++;
3294 newp = new = malloc(sizeof(uschar *) * (count + 1));
3295 for (p = USS environ; *p != NULL; p++)
3297 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3300 if (timezone_string != NULL)
3302 *newp = malloc(Ustrlen(timezone_string) + 4);
3303 sprintf(CS *newp++, "TZ=%s", timezone_string);
3308 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3309 tod_stamp(tod_log));
3313 /* Handle the case when we have removed the setuid privilege because of -C or
3314 -D. This means that the caller of Exim was not root, and, provided that
3315 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3318 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3319 were running as the exim user defined in the configuration file (different to
3320 the one in the binary). The sysadmin may expect this case to retain privilege
3321 because "the binary was called by the Exim user", but it hasn't, because of the
3322 order in which it handles this stuff. There are two possibilities:
3324 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3325 to do message deliveries. Thus, the fact that it is running as a
3326 non-privileged user is plausible, and might be wanted in some special
3327 configurations. However, really_exim will have been set false when
3328 privilege was dropped, to stop Exim trying to write to its normal log
3329 files. Therefore, re-enable normal log processing, assuming the sysadmin
3330 has set up the log directory correctly.
3332 (2) If deliver_drop_privilege is not set, the configuration won't work as
3333 apparently intended, and so we log a panic message. In order to retain
3334 root for -C or -D, the caller must either be root or the Exim user
3335 defined in the binary (when deliver_drop_ privilege is false).
3337 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3338 built-in exim user or one defined in the configuration. In either event,
3339 re-enable log processing, assuming the sysadmin knows what they are doing. */
3341 if (removed_privilege && (config_changed || macros != NULL) &&
3342 real_uid == exim_uid)
3344 #ifdef ALT_CONFIG_ROOT_ONLY
3345 really_exim = TRUE; /* let logging work normally */
3348 if (deliver_drop_privilege)
3349 really_exim = TRUE; /* let logging work normally */
3351 log_write(0, LOG_MAIN|LOG_PANIC,
3352 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3353 (int)exim_uid, config_changed? "-C" : "-D");
3357 /* Start up Perl interpreter if Perl support is configured and there is a
3358 perl_startup option, and the configuration or the command line specifies
3359 initializing starting. Note that the global variables are actually called
3360 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3363 if (perl_start_option != 0)
3364 opt_perl_at_start = (perl_start_option > 0);
3365 if (opt_perl_at_start && opt_perl_startup != NULL)
3368 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3369 errstr = init_perl(opt_perl_startup);
3372 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3373 return EXIT_FAILURE;
3375 opt_perl_started = TRUE;
3377 #endif /* EXIM_PERL */
3379 /* Log the arguments of the call if the configuration file said so. This is
3380 a debugging feature for finding out what arguments certain MUAs actually use.
3381 Don't attempt it if logging is disabled, or if listing variables or if
3382 verifying/testing addresses or expansions. */
3384 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3385 && really_exim && !list_options && !checking)
3388 uschar *p = big_buffer;
3390 (void)getcwd(CS p+4, big_buffer_size - 4);
3392 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3394 for (i = 0; i < argc; i++)
3396 int len = Ustrlen(argv[i]);
3399 if (p + len + 8 >= big_buffer + big_buffer_size)
3402 log_write(0, LOG_MAIN, "%s", big_buffer);
3403 Ustrcpy(big_buffer, "...");
3406 printing = string_printing(argv[i]);
3407 if (printing[0] == 0) quote = US"\""; else
3409 uschar *pp = printing;
3411 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3413 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3414 (p - big_buffer) - 4), printing, quote);
3418 if ((log_extra_selector & LX_arguments) != 0)
3419 log_write(0, LOG_MAIN, "%s", big_buffer);
3421 debug_printf("%s\n", big_buffer);
3424 /* Set the working directory to be the top-level spool directory. We don't rely
3425 on this in the code, which always uses fully qualified names, but it's useful
3426 for core dumps etc. Don't complain if it fails - the spool directory might not
3427 be generally accessible and calls with the -C option (and others) have lost
3428 privilege by now. Before the chdir, we try to ensure that the directory exists.
3431 if (Uchdir(spool_directory) != 0)
3433 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3434 (void)Uchdir(spool_directory);
3437 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3438 alias file. Exim doesn't have such a concept, but this call is screwed into
3439 Sun's YP makefiles. Handle this by calling a configured script, as the real
3440 user who called Exim. The -oA option can be used to pass an argument to the
3445 (void)fclose(config_file);
3446 if (bi_command != NULL)
3450 argv[i++] = bi_command;
3451 if (alias_arg != NULL) argv[i++] = alias_arg;
3454 setgroups(group_count, group_list);
3455 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3457 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3458 (argv[1] == NULL)? US"" : argv[1]);
3460 execv(CS argv[0], (char *const *)argv);
3461 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3466 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3471 /* If an action on specific messages is requested, or if a daemon or queue
3472 runner is being started, we need to know if Exim was called by an admin user.
3473 This is the case if the real user is root or exim, or if the real group is
3474 exim, or if one of the supplementary groups is exim or a group listed in
3475 admin_groups. We don't fail all message actions immediately if not admin_user,
3476 since some actions can be performed by non-admin users. Instead, set admin_user
3477 for later interrogation. */
3479 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3484 for (i = 0; i < group_count; i++)
3486 if (group_list[i] == exim_gid) admin_user = TRUE;
3487 else if (admin_groups != NULL)
3489 for (j = 1; j <= (int)(admin_groups[0]); j++)
3490 if (admin_groups[j] == group_list[i])
3491 { admin_user = TRUE; break; }
3493 if (admin_user) break;
3497 /* Another group of privileged users are the trusted users. These are root,
3498 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3499 are permitted to specify sender_addresses with -f on the command line, and
3500 other message parameters as well. */
3502 if (real_uid == root_uid || real_uid == exim_uid)
3503 trusted_caller = TRUE;
3508 if (trusted_users != NULL)
3510 for (i = 1; i <= (int)(trusted_users[0]); i++)
3511 if (trusted_users[i] == real_uid)
3512 { trusted_caller = TRUE; break; }
3515 if (!trusted_caller && trusted_groups != NULL)
3517 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3519 if (trusted_groups[i] == real_gid)
3520 trusted_caller = TRUE;
3521 else for (j = 0; j < group_count; j++)
3523 if (trusted_groups[i] == group_list[j])
3524 { trusted_caller = TRUE; break; }
3526 if (trusted_caller) break;
3531 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3532 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3534 /* Only an admin user may start the daemon or force a queue run in the default
3535 configuration, but the queue run restriction can be relaxed. Only an admin
3536 user may request that a message be returned to its sender forthwith. Only an
3537 admin user may specify a debug level greater than D_v (because it might show
3538 passwords, etc. in lookup queries). Only an admin user may request a queue
3543 BOOL debugset = (debug_selector & ~D_v) != 0;
3544 if (deliver_give_up || daemon_listen ||
3545 (count_queue && queue_list_requires_admin) ||
3546 (list_queue && queue_list_requires_admin) ||
3547 (queue_interval >= 0 && prod_requires_admin) ||
3548 (debugset && !running_in_test_harness))
3550 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3555 /* If the real user is not root or the exim uid, the argument for passing
3556 in an open TCP/IP connection for another message is not permitted, nor is
3557 running with the -N option for any delivery action, unless this call to exim is
3558 one that supplied an input message, or we are using a patched exim for
3559 regression testing. */
3561 if (real_uid != root_uid && real_uid != exim_uid &&
3562 (continue_hostname != NULL ||
3564 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3565 )) && !running_in_test_harness)
3567 fprintf(stderr, "exim: Permission denied\n");
3568 return EXIT_FAILURE;
3571 /* If the caller is not trusted, certain arguments are ignored when running for
3572 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3573 Note that authority for performing certain actions on messages is tested in the
3574 queue_action() function. */
3576 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3578 sender_host_name = sender_host_address = interface_address =
3579 sender_ident = received_protocol = NULL;
3580 sender_host_port = interface_port = 0;
3581 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3584 /* If a sender host address is set, extract the optional port number off the
3585 end of it and check its syntax. Do the same thing for the interface address.
3586 Exim exits if the syntax is bad. */
3590 if (sender_host_address != NULL)
3591 sender_host_port = check_port(sender_host_address);
3592 if (interface_address != NULL)
3593 interface_port = check_port(interface_address);
3596 /* If an SMTP message is being received check to see if the standard input is a
3597 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3598 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3603 union sockaddr_46 inetd_sock;
3604 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3605 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3607 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3608 if (family == AF_INET || family == AF_INET6)
3610 union sockaddr_46 interface_sock;
3611 size = sizeof(interface_sock);
3613 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3614 interface_address = host_ntoa(-1, &interface_sock, NULL,
3617 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3619 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3622 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3623 NULL, &sender_host_port);
3624 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3625 "inetd is not supported when mua_wrapper is set");
3630 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3631 return EXIT_FAILURE;
3637 /* If the load average is going to be needed while receiving a message, get it
3638 now for those OS that require the first call to os_getloadavg() to be done as
3639 root. There will be further calls later for each message received. */
3641 #ifdef LOAD_AVG_NEEDS_ROOT
3642 if (receiving_message &&
3643 (queue_only_load >= 0 ||
3644 (is_inetd && smtp_load_reserve >= 0)
3647 load_average = OS_GETLOADAVG();
3651 /* The queue_only configuration option can be overridden by -odx on the command
3652 line, except that if queue_only_override is false, queue_only cannot be unset
3653 from the command line. */
3655 if (queue_only_set && (queue_only_override || arg_queue_only))
3656 queue_only = arg_queue_only;
3658 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3661 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3662 if (arg_smtp_receive_timeout >= 0)
3663 smtp_receive_timeout = arg_smtp_receive_timeout;
3665 /* If Exim was started with root privilege, unless we have already removed the
3666 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3667 except when starting the daemon or doing some kind of delivery or address
3668 testing (-bt). These are the only cases when root need to be retained. We run
3669 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3670 retained only for starting the daemon. We always do the initgroups() in this
3671 situation (controlled by the TRUE below), in order to be as close as possible
3672 to the state Exim usually runs in. */
3674 if (!unprivileged && /* originally had root AND */
3675 !removed_privilege && /* still got root AND */
3676 !daemon_listen && /* not starting the daemon */
3677 queue_interval <= 0 && /* (either kind of daemon) */
3679 deliver_drop_privilege || /* requested unprivileged */
3681 queue_interval < 0 && /* not running the queue */
3682 (msg_action_arg < 0 || /* and */
3683 msg_action != MSG_DELIVER) && /* not delivering and */
3684 (!checking || !address_test_mode) /* not address checking */
3688 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3691 /* When we are retaining a privileged uid, we still change to the exim gid. */
3693 else setgid(exim_gid);
3695 /* Handle a request to list the delivery queue */
3699 set_process_info("listing the queue");
3700 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3704 /* Handle a request to count the delivery queue */
3708 set_process_info("counting the queue");
3713 /* Handle actions on specific messages, except for the force delivery and
3714 message load actions, which are done below. Some actions take a whole list of
3715 message ids, which are known to continue up to the end of the arguments. Others
3716 take a single message id and then operate on the recipients list. */
3718 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3720 int yield = EXIT_SUCCESS;
3721 set_process_info("acting on specified messages");
3723 if (!one_msg_action)
3725 for (i = msg_action_arg; i < argc; i++)
3726 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3727 yield = EXIT_FAILURE;
3730 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3731 recipients_arg)) yield = EXIT_FAILURE;
3735 /* All the modes below here require the remaining configuration sections
3736 to be read, except that we can skip over the ACL setting when delivering
3737 specific messages, or doing a queue run. (For various testing cases we could
3738 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3741 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3743 /* The configuration data will have been read into POOL_PERM because we won't
3744 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3745 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3746 configuration were read into POOL_MAIN, because we don't do any resets till
3747 later on. However, it seems right, and it does ensure that both pools get used.
3750 store_pool = POOL_MAIN;
3752 /* Handle the -brt option. This is for checking out retry configurations.
3753 The next three arguments are a domain name or a complete address, and
3754 optionally two error numbers. All it does is to call the function that
3755 scans the retry configuration data. */
3757 if (test_retry_arg >= 0)
3759 retry_config *yield;
3760 int basic_errno = 0;
3764 if (test_retry_arg >= argc)
3766 printf("-brt needs a domain or address argument\n");
3767 exim_exit(EXIT_FAILURE);
3769 s1 = argv[test_retry_arg++];
3772 /* If the first argument contains no @ and no . it might be a local user
3773 or it might be a single-component name. Treat as a domain. */
3775 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3777 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3778 "being \ntreated as a one-component domain, not as a local part.\n\n",
3782 /* There may be an optional second domain arg. */
3784 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3785 s2 = argv[test_retry_arg++];
3787 /* The final arg is an error name */
3789 if (test_retry_arg < argc)
3791 uschar *ss = argv[test_retry_arg];
3793 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3796 printf("%s\n", CS error);
3797 return EXIT_FAILURE;
3800 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3801 code > 100 as an error is for matching codes to the decade. Turn them into
3802 a real error code, off the decade. */
3804 if (basic_errno == ERRNO_MAIL4XX ||
3805 basic_errno == ERRNO_RCPT4XX ||
3806 basic_errno == ERRNO_DATA4XX)
3808 int code = (more_errno >> 8) & 255;
3810 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3811 else if (code > 100)
3812 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3816 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3817 if (yield == NULL) printf("No retry information found\n"); else
3820 more_errno = yield->more_errno;
3821 printf("Retry rule: %s ", yield->pattern);
3823 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3825 printf("quota%s%s ",
3826 (more_errno > 0)? "_" : "",
3827 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3829 else if (yield->basic_errno == ECONNREFUSED)
3831 printf("refused%s%s ",
3832 (more_errno > 0)? "_" : "",
3833 (more_errno == 'M')? "MX" :
3834 (more_errno == 'A')? "A" : "");
3836 else if (yield->basic_errno == ETIMEDOUT)
3839 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3841 if (more_errno != 0) printf("_%s",
3842 (more_errno == 'M')? "MX" : "A");
3845 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3846 printf("auth_failed ");
3849 for (r = yield->rules; r != NULL; r = r->next)
3851 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3852 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3858 printf(",%d.", x/1000);
3872 exim_exit(EXIT_SUCCESS);
3875 /* Handle a request to list one or more configuration options */
3879 set_process_info("listing variables");
3880 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3881 else for (i = recipients_arg; i < argc; i++)
3884 (Ustrcmp(argv[i], "router") == 0 ||
3885 Ustrcmp(argv[i], "transport") == 0 ||
3886 Ustrcmp(argv[i], "authenticator") == 0))
3888 readconf_print(argv[i+1], argv[i]);
3891 else readconf_print(argv[i], NULL);
3893 exim_exit(EXIT_SUCCESS);
3897 /* Handle a request to deliver one or more messages that are already on the
3898 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3899 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3901 Delivery of specific messages is typically used for a small number when
3902 prodding by hand (when the option forced_delivery will be set) or when
3903 re-execing to regain root privilege. Each message delivery must happen in a
3904 separate process, so we fork a process for each one, and run them sequentially
3905 so that debugging output doesn't get intertwined, and to avoid spawning too
3906 many processes if a long list is given. However, don't fork for the last one;
3907 this saves a process in the common case when Exim is called to deliver just one
3910 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3912 if (prod_requires_admin && !admin_user)
3914 fprintf(stderr, "exim: Permission denied\n");
3915 exim_exit(EXIT_FAILURE);
3917 set_process_info("delivering specified messages");
3918 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3919 for (i = msg_action_arg; i < argc; i++)
3924 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3925 else if ((pid = fork()) == 0)
3927 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3928 _exit(EXIT_SUCCESS);
3932 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3934 exim_exit(EXIT_FAILURE);
3938 exim_exit(EXIT_SUCCESS);
3942 /* If only a single queue run is requested, without SMTP listening, we can just
3943 turn into a queue runner, with an optional starting message id. */
3945 if (queue_interval == 0 && !daemon_listen)
3947 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3948 (start_queue_run_id == NULL)? US"" : US" starting at ",
3949 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3950 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3951 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3952 set_process_info("running the queue (single queue run)");
3953 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3954 exim_exit(EXIT_SUCCESS);
3958 /* Find the login name of the real user running this process. This is always
3959 needed when receiving a message, because it is written into the spool file. It
3960 may also be used to construct a from: or a sender: header, and in this case we
3961 need the user's full name as well, so save a copy of it, checked for RFC822
3962 syntax and munged if necessary, if it hasn't previously been set by the -F
3963 argument. We may try to get the passwd entry more than once, in case NIS or
3964 other delays are in evidence. Save the home directory for use in filter testing
3969 if ((pw = getpwuid(real_uid)) != NULL)
3971 originator_login = string_copy(US pw->pw_name);
3972 originator_home = string_copy(US pw->pw_dir);
3974 /* If user name has not been set by -F, set it from the passwd entry
3975 unless -f has been used to set the sender address by a trusted user. */
3977 if (originator_name == NULL)
3979 if (sender_address == NULL ||
3980 (!trusted_caller && filter_test == FTEST_NONE))
3982 uschar *name = US pw->pw_gecos;
3983 uschar *amp = Ustrchr(name, '&');
3986 /* Most Unix specify that a '&' character in the gecos field is
3987 replaced by a copy of the login name, and some even specify that
3988 the first character should be upper cased, so that's what we do. */
3993 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3994 amp - name, name, &loffset, originator_login, amp + 1);
3995 buffer[loffset] = toupper(buffer[loffset]);
3999 /* If a pattern for matching the gecos field was supplied, apply
4000 it and then expand the name string. */
4002 if (gecos_pattern != NULL && gecos_name != NULL)
4005 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4007 if (regex_match_and_setup(re, name, 0, -1))
4009 uschar *new_name = expand_string(gecos_name);
4011 if (new_name != NULL)
4013 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4014 "gecos field \"%s\"\n", new_name, name);
4017 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4018 "\"%s\": %s\n", gecos_name, expand_string_message);
4020 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4021 "gecos field \"%s\"\n", gecos_pattern, name);
4022 store_free((void *)re);
4024 originator_name = string_copy(name);
4027 /* A trusted caller has used -f but not -F */
4029 else originator_name = US"";
4032 /* Break the retry loop */
4037 if (++i > finduser_retries) break;
4041 /* If we cannot get a user login, log the incident and give up, unless the
4042 configuration specifies something to use. When running in the test harness,
4043 any setting of unknown_login overrides the actual name. */
4045 if (originator_login == NULL || running_in_test_harness)
4047 if (unknown_login != NULL)
4049 originator_login = expand_string(unknown_login);
4050 if (originator_name == NULL && unknown_username != NULL)
4051 originator_name = expand_string(unknown_username);
4052 if (originator_name == NULL) originator_name = US"";
4054 if (originator_login == NULL)
4055 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4059 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4062 originator_name = string_copy(parse_fix_phrase(originator_name,
4063 Ustrlen(originator_name), big_buffer, big_buffer_size));
4065 /* If a message is created by this call of Exim, the uid/gid of its originator
4066 are those of the caller. These values are overridden if an existing message is
4067 read in from the spool. */
4069 originator_uid = real_uid;
4070 originator_gid = real_gid;
4072 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4073 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4075 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4076 returns. We leave this till here so that the originator_ fields are available
4077 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4080 if (daemon_listen || queue_interval > 0)
4084 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4085 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4086 "mua_wrapper is set");
4091 /* If the sender ident has not been set (by a trusted caller) set it to
4092 the caller. This will get overwritten below for an inetd call. If a trusted
4093 caller has set it empty, unset it. */
4095 if (sender_ident == NULL) sender_ident = originator_login;
4096 else if (sender_ident[0] == 0) sender_ident = NULL;
4098 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4099 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4100 originator_* variables set. */
4102 if (test_rewrite_arg >= 0)
4104 really_exim = FALSE;
4105 if (test_rewrite_arg >= argc)
4107 printf("-brw needs an address argument\n");
4108 exim_exit(EXIT_FAILURE);
4110 rewrite_test(argv[test_rewrite_arg]);
4111 exim_exit(EXIT_SUCCESS);
4114 /* A locally-supplied message is considered to be coming from a local user
4115 unless a trusted caller supplies a sender address with -f, or is passing in the
4116 message via SMTP (inetd invocation or otherwise). */
4118 if ((sender_address == NULL && !smtp_input) ||
4119 (!trusted_caller && filter_test == FTEST_NONE))
4121 sender_local = TRUE;
4123 /* A trusted caller can supply authenticated_sender and authenticated_id
4124 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4125 defaults except when host checking. */
4127 if (authenticated_sender == NULL && !host_checking)
4128 authenticated_sender = string_sprintf("%s@%s", originator_login,
4129 qualify_domain_sender);
4130 if (authenticated_id == NULL && !host_checking)
4131 authenticated_id = originator_login;
4134 /* Trusted callers are always permitted to specify the sender address.
4135 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4136 is specified is the empty address. However, if a trusted caller does not
4137 specify a sender address for SMTP input, we leave sender_address unset. This
4138 causes the MAIL commands to be honoured. */
4140 if ((!smtp_input && sender_address == NULL) ||
4141 !receive_check_set_sender(sender_address))
4143 /* Either the caller is not permitted to set a general sender, or this is
4144 non-SMTP input and the trusted caller has not set a sender. If there is no
4145 sender, or if a sender other than <> is set, override with the originator's
4146 login (which will get qualified below), except when checking things. */
4148 if (sender_address == NULL /* No sender_address set */
4150 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4151 !checking && /* Not running tests, AND */
4152 filter_test == FTEST_NONE)) /* Not testing a filter */
4154 sender_address = originator_login;
4155 sender_address_forced = FALSE;
4156 sender_address_domain = 0;
4160 /* Remember whether an untrusted caller set the sender address */
4162 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4164 /* Ensure that the sender address is fully qualified unless it is the empty
4165 address, which indicates an error message, or doesn't exist (root caller, smtp
4166 interface, no -f argument). */
4168 if (sender_address != NULL && sender_address[0] != 0 &&
4169 sender_address_domain == 0)
4170 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4171 qualify_domain_sender);
4173 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4175 /* Handle a request to verify a list of addresses, or test them for delivery.
4176 This must follow the setting of the sender address, since routers can be
4177 predicated upon the sender. If no arguments are given, read addresses from
4178 stdin. Set debug_level to at least D_v to get full output for address testing.
4181 if (verify_address_mode || address_test_mode)
4184 int flags = vopt_qualify;
4186 if (verify_address_mode)
4188 if (!verify_as_sender) flags |= vopt_is_recipient;
4189 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4194 flags |= vopt_is_recipient;
4195 debug_selector |= D_v;
4196 debug_file = stderr;
4197 debug_fd = fileno(debug_file);
4198 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4201 if (recipients_arg < argc)
4203 while (recipients_arg < argc)
4205 uschar *s = argv[recipients_arg++];
4208 BOOL finished = FALSE;
4209 uschar *ss = parse_find_address_end(s, FALSE);
4210 if (*ss == ',') *ss = 0; else finished = TRUE;
4211 test_address(s, flags, &exit_value);
4214 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4221 uschar *s = get_stdinput(NULL, NULL);
4222 if (s == NULL) break;
4223 test_address(s, flags, &exit_value);
4227 exim_exit(exit_value);
4230 /* Handle expansion checking. Either expand items on the command line, or read
4231 from stdin if there aren't any. If -Mset was specified, load the message so
4232 that its variables can be used, but restrict this facility to admin users.
4233 Otherwise, if -bem was used, read a message from stdin. */
4237 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4239 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4242 fprintf(stderr, "exim: permission denied\n");
4245 message_id = argv[msg_action_arg];
4246 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4247 if (!spool_open_datafile(message_id))
4248 printf ("Failed to load message datafile %s\n", message_id);
4249 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4250 printf ("Failed to load message %s\n", message_id);
4253 /* Read a test message from a file. We fudge it up to be on stdin, saving
4254 stdin itself for later reading of expansion strings. */
4256 else if (expansion_test_message != NULL)
4258 int save_stdin = dup(0);
4259 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4262 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4264 return EXIT_FAILURE;
4267 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4268 message_ended = END_NOTENDED;
4269 read_message_body(receive_msg(extract_recipients));
4270 message_linecount += body_linecount;
4271 (void)dup2(save_stdin, 0);
4272 (void)close(save_stdin);
4273 clearerr(stdin); /* Required by Darwin */
4276 /* Allow $recipients for this testing */
4278 enable_dollar_recipients = TRUE;
4280 /* Expand command line items */
4282 if (recipients_arg < argc)
4284 while (recipients_arg < argc)
4286 uschar *s = argv[recipients_arg++];
4287 uschar *ss = expand_string(s);
4288 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4289 else printf("%s\n", CS ss);
4297 char *(*fn_readline)(char *) = NULL;
4298 char *(*fn_addhist)(char *) = NULL;
4301 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4307 uschar *source = get_stdinput(fn_readline, fn_addhist);
4308 if (source == NULL) break;
4309 ss = expand_string(source);
4311 printf ("Failed: %s\n", expand_string_message);
4312 else printf("%s\n", CS ss);
4316 if (dlhandle != NULL) dlclose(dlhandle);
4320 /* The data file will be open after -Mset */
4322 if (deliver_datafile >= 0)
4324 (void)close(deliver_datafile);
4325 deliver_datafile = -1;
4328 exim_exit(EXIT_SUCCESS);
4332 /* The active host name is normally the primary host name, but it can be varied
4333 for hosts that want to play several parts at once. We need to ensure that it is
4334 set for host checking, and for receiving messages. */
4336 smtp_active_hostname = primary_hostname;
4337 if (raw_active_hostname != NULL)
4339 uschar *nah = expand_string(raw_active_hostname);
4342 if (!expand_string_forcedfail)
4343 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4344 "(smtp_active_hostname): %s", raw_active_hostname,
4345 expand_string_message);
4347 else if (nah[0] != 0) smtp_active_hostname = nah;
4350 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4351 given IP address so that the blocking and relay configuration can be tested.
4352 Unless a sender_ident was set by -oMt, we discard it (the default is the
4353 caller's login name). An RFC 1413 call is made only if we are running in the
4354 test harness and an incoming interface and both ports are specified, because
4355 there is no TCP/IP call to find the ident for. */
4362 if (!sender_ident_set)
4364 sender_ident = NULL;
4365 if (running_in_test_harness && sender_host_port != 0 &&
4366 interface_address != NULL && interface_port != 0)
4367 verify_get_ident(1413);
4370 /* In case the given address is a non-canonical IPv6 address, canonicize
4371 it. The code works for both IPv4 and IPv6, as it happens. */
4373 size = host_aton(sender_host_address, x);
4374 sender_host_address = store_get(48); /* large enough for full IPv6 */
4375 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4377 /* Now set up for testing */
4379 host_build_sender_fullhost();
4383 sender_local = FALSE;
4384 sender_host_notsocket = TRUE;
4385 debug_file = stderr;
4386 debug_fd = fileno(debug_file);
4387 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4388 "**** but without any ident (RFC 1413) callback.\n"
4389 "**** This is not for real!\n\n",
4390 sender_host_address);
4392 if (verify_check_host(&hosts_connection_nolog) == OK)
4393 log_write_selector &= ~L_smtp_connection;
4394 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4396 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4397 because a log line has already been written for all its failure exists
4398 (usually "connection refused: <reason>") and writing another one is
4399 unnecessary clutter. */
4401 if (smtp_start_session())
4403 reset_point = store_get(0);
4406 store_reset(reset_point);
4407 if (smtp_setup_msg() <= 0) break;
4408 if (!receive_msg(FALSE)) break;
4412 exim_exit(EXIT_SUCCESS);
4416 /* Arrange for message reception if recipients or SMTP were specified;
4417 otherwise complain unless a version print (-bV) happened or this is a filter
4418 verification test. In the former case, show the configuration file name. */
4420 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4422 if (version_printed)
4424 printf("Configuration file is %s\n", config_main_filename);
4425 return EXIT_SUCCESS;
4427 if (filter_test == FTEST_NONE)
4430 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4431 "not directly from a shell command line. Options and/or arguments control\n"
4432 "what it does when called. For a list of options, see the Exim documentation.\n");
4433 return EXIT_FAILURE;
4438 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4439 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4440 that we are not called from inetd, because that is rejected above. The
4441 following configuration settings are forced here:
4443 (1) Synchronous delivery (-odi)
4444 (2) Errors to stderr (-oep == -oeq)
4445 (3) No parallel remote delivery
4446 (4) Unprivileged delivery
4448 We don't force overall queueing options because there are several of them;
4449 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4450 to override any SMTP queueing. */
4454 synchronous_delivery = TRUE;
4455 arg_error_handling = ERRORS_STDERR;
4456 remote_max_parallel = 1;
4457 deliver_drop_privilege = TRUE;
4459 queue_smtp_domains = NULL;
4463 /* Prepare to accept one or more new messages on the standard input. When a
4464 message has been read, its id is returned in message_id[]. If doing immediate
4465 delivery, we fork a delivery process for each received message, except for the
4466 last one, where we can save a process switch.
4468 It is only in non-smtp mode that error_handling is allowed to be changed from
4469 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4470 sendmail error modes other than -oem ever actually used? Later: yes.) */
4472 if (!smtp_input) error_handling = arg_error_handling;
4474 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4475 logging being sent down the socket and make an identd call to get the
4480 (void)fclose(stderr);
4481 exim_nullstd(); /* Re-open to /dev/null */
4482 verify_get_ident(IDENT_PORT);
4483 host_build_sender_fullhost();
4484 set_process_info("handling incoming connection from %s via inetd",
4488 /* If the sender host address has been set, build sender_fullhost if it hasn't
4489 already been done (which it will have been for inetd). This caters for the
4490 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4491 so that the test for IP options is skipped for -bs input. */
4493 if (sender_host_address != NULL && sender_fullhost == NULL)
4495 host_build_sender_fullhost();
4496 set_process_info("handling incoming connection from %s via -oMa",
4498 sender_host_notsocket = TRUE;
4501 /* Otherwise, set the sender host as unknown except for inetd calls. This
4502 prevents host checking in the case of -bs not from inetd and also for -bS. */
4504 else if (!is_inetd) sender_host_unknown = TRUE;
4506 /* If stdout does not exist, then dup stdin to stdout. This can happen
4507 if exim is started from inetd. In this case fd 0 will be set to the socket,
4508 but fd 1 will not be set. This also happens for passed SMTP channels. */
4510 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4512 /* Set up the incoming protocol name and the state of the program. Root is
4513 allowed to force received protocol via the -oMr option above. If we have come
4514 via inetd, the process info has already been set up. We don't set
4515 received_protocol here for smtp input, as it varies according to
4516 batch/HELO/EHLO/AUTH/TLS. */
4520 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4521 smtp_batched_input? "batched " : "",
4522 (sender_address!= NULL)? sender_address : originator_login);
4526 if (received_protocol == NULL)
4527 received_protocol = string_sprintf("local%s", called_as);
4528 set_process_info("accepting a local non-SMTP message from <%s>",
4532 /* Initialize the session_local_queue-only flag (this will be ignored if
4533 mua_wrapper is set) */
4536 session_local_queue_only = queue_only;
4538 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4539 the spool if so configured. On failure, we must not attempt to send an error
4540 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4541 error code is given.) */
4543 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4545 fprintf(stderr, "exim: insufficient disk space\n");
4546 return EXIT_FAILURE;
4549 /* If this is smtp input of any kind, real or batched, handle the start of the
4552 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4553 because a log line has already been written for all its failure exists
4554 (usually "connection refused: <reason>") and writing another one is
4555 unnecessary clutter. */
4561 if (verify_check_host(&hosts_connection_nolog) == OK)
4562 log_write_selector &= ~L_smtp_connection;
4563 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4564 if (!smtp_start_session())
4567 exim_exit(EXIT_SUCCESS);
4571 /* Otherwise, set up the input size limit here. */
4575 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4576 if (expand_string_message != NULL)
4578 if (thismessage_size_limit == -1)
4579 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4580 "message_size_limit: %s", expand_string_message);
4582 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4583 "message_size_limit: %s", expand_string_message);
4587 /* Loop for several messages when reading SMTP input. If we fork any child
4588 processes, we don't want to wait for them unless synchronous delivery is
4589 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4590 same as SIG_DFL, despite the fact that documentation often lists the default as
4591 "ignore". This is a confusing area. This is what I know:
4593 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4594 processes that complete simply to go away without ever becoming defunct. You
4595 can't then wait for them - but we don't want to wait for them in the
4596 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4597 happen for all OS (e.g. *BSD is different).
4599 But that's not the end of the story. Some (many? all?) systems have the
4600 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4601 has by default, so it seems that the difference is merely one of default
4602 (compare restarting vs non-restarting signals).
4604 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4605 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4606 of the loop below. Paranoia rules.
4608 February 2003: That's *still* not the end of the story. There are now versions
4609 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4610 process then calls waitpid(), a grumble is written to the system log, because
4611 this is logically inconsistent. In other words, it doesn't like the paranoia.
4612 As a consequenc of this, the waitpid() below is now excluded if we are sure
4613 that SIG_IGN works. */
4615 if (!synchronous_delivery)
4618 struct sigaction act;
4619 act.sa_handler = SIG_IGN;
4620 sigemptyset(&(act.sa_mask));
4621 act.sa_flags = SA_NOCLDWAIT;
4622 sigaction(SIGCHLD, &act, NULL);
4624 signal(SIGCHLD, SIG_IGN);
4628 /* Save the current store pool point, for resetting at the start of
4629 each message, and save the real sender address, if any. */
4631 reset_point = store_get(0);
4632 real_sender_address = sender_address;
4634 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4635 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4640 store_reset(reset_point);
4643 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4644 input and build the recipients list, before calling receive_msg() to read the
4645 message proper. Whatever sender address is given in the SMTP transaction is
4646 often ignored for local senders - we use the actual sender, which is normally
4647 either the underlying user running this process or a -f argument provided by
4648 a trusted caller. It is saved in real_sender_address. The test for whether to
4649 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4654 if ((rc = smtp_setup_msg()) > 0)
4656 if (real_sender_address != NULL &&
4657 !receive_check_set_sender(sender_address))
4659 sender_address = raw_sender = real_sender_address;
4660 sender_address_unrewritten = NULL;
4663 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4664 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4665 the very end. The result of the ACL is ignored (as for other non-SMTP
4666 messages). It is run for its potential side effects. */
4668 if (smtp_batched_input && acl_not_smtp_start != NULL)
4670 uschar *user_msg, *log_msg;
4671 enable_dollar_recipients = TRUE;
4672 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4673 &user_msg, &log_msg);
4674 enable_dollar_recipients = FALSE;
4677 /* Now get the data for the message */
4679 more = receive_msg(extract_recipients);
4680 if (message_id[0] == 0)
4683 smtp_log_no_mail(); /* Log no mail if configured */
4684 exim_exit(EXIT_FAILURE);
4689 smtp_log_no_mail(); /* Log no mail if configured */
4690 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4694 /* In the non-SMTP case, we have all the information from the command
4695 line, but must process it in case it is in the more general RFC822
4696 format, and in any case, to detect syntax errors. Also, it appears that
4697 the use of comma-separated lists as single arguments is common, so we
4698 had better support them. */
4704 int count = argc - recipients_arg;
4705 uschar **list = argv + recipients_arg;
4707 /* These options cannot be changed dynamically for non-SMTP messages */
4709 active_local_sender_retain = local_sender_retain;
4710 active_local_from_check = local_from_check;
4712 /* Save before any rewriting */
4714 raw_sender = string_copy(sender_address);
4716 /* Loop for each argument */
4718 for (i = 0; i < count; i++)
4720 int start, end, domain;
4722 uschar *s = list[i];
4724 /* Loop for each comma-separated address */
4728 BOOL finished = FALSE;
4730 uschar *ss = parse_find_address_end(s, FALSE);
4732 if (*ss == ',') *ss = 0; else finished = TRUE;
4734 /* Check max recipients - if -t was used, these aren't recipients */
4736 if (recipients_max > 0 && ++rcount > recipients_max &&
4737 !extract_recipients)
4739 if (error_handling == ERRORS_STDERR)
4741 fprintf(stderr, "exim: too many recipients\n");
4742 exim_exit(EXIT_FAILURE);
4747 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4748 errors_sender_rc : EXIT_FAILURE;
4753 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4755 if (domain == 0 && !allow_unqualified_recipient)
4758 errmess = US"unqualified recipient address not allowed";
4761 if (recipient == NULL)
4763 if (error_handling == ERRORS_STDERR)
4765 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4766 string_printing(list[i]), errmess);
4767 exim_exit(EXIT_FAILURE);
4773 eblock.text1 = string_printing(list[i]);
4774 eblock.text2 = errmess;
4776 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4777 errors_sender_rc : EXIT_FAILURE;
4781 receive_add_recipient(recipient, -1);
4784 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4788 /* Show the recipients when debugging */
4793 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4794 if (recipients_list != NULL)
4796 debug_printf("Recipients:\n");
4797 for (i = 0; i < recipients_count; i++)
4798 debug_printf(" %s\n", recipients_list[i].address);
4802 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4803 ignored; rejecting here would just add complication, and it can just as
4804 well be done later. Allow $recipients to be visible in the ACL. */
4806 if (acl_not_smtp_start != NULL)
4808 uschar *user_msg, *log_msg;
4809 enable_dollar_recipients = TRUE;
4810 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4811 &user_msg, &log_msg);
4812 enable_dollar_recipients = FALSE;
4815 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4816 will just read the headers for the message, and not write anything onto the
4819 message_ended = END_NOTENDED;
4820 more = receive_msg(extract_recipients);
4822 /* more is always FALSE here (not SMTP message) when reading a message
4823 for real; when reading the headers of a message for filter testing,
4824 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4826 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4827 } /* Non-SMTP message reception */
4829 /* If this is a filter testing run, there are headers in store, but
4830 no message on the spool. Run the filtering code in testing mode, setting
4831 the domain to the qualify domain and the local part to the current user,
4832 unless they have been set by options. The prefix and suffix are left unset
4833 unless specified. The the return path is set to to the sender unless it has
4834 already been set from a return-path header in the message. */
4836 if (filter_test != FTEST_NONE)
4838 deliver_domain = (ftest_domain != NULL)?
4839 ftest_domain : qualify_domain_recipient;
4840 deliver_domain_orig = deliver_domain;
4841 deliver_localpart = (ftest_localpart != NULL)?
4842 ftest_localpart : originator_login;
4843 deliver_localpart_orig = deliver_localpart;
4844 deliver_localpart_prefix = ftest_prefix;
4845 deliver_localpart_suffix = ftest_suffix;
4846 deliver_home = originator_home;
4848 if (return_path == NULL)
4850 printf("Return-path copied from sender\n");
4851 return_path = string_copy(sender_address);
4855 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4857 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4859 receive_add_recipient(
4860 string_sprintf("%s%s%s@%s",
4861 (ftest_prefix == NULL)? US"" : ftest_prefix,
4863 (ftest_suffix == NULL)? US"" : ftest_suffix,
4864 deliver_domain), -1);
4866 printf("Recipient = %s\n", recipients_list[0].address);
4867 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4868 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4870 (void)chdir("/"); /* Get away from wherever the user is running this from */
4872 /* Now we run either a system filter test, or a user filter test, or both.
4873 In the latter case, headers added by the system filter will persist and be
4874 available to the user filter. We need to copy the filter variables
4877 if ((filter_test & FTEST_SYSTEM) != 0)
4879 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4880 exim_exit(EXIT_FAILURE);
4883 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4885 if ((filter_test & FTEST_USER) != 0)
4887 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4888 exim_exit(EXIT_FAILURE);
4891 exim_exit(EXIT_SUCCESS);
4894 /* Else act on the result of message reception. We should not get here unless
4895 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4896 will be TRUE. If it is not, check on the number of messages received in this
4899 if (!session_local_queue_only &&
4900 smtp_accept_queue_per_connection > 0 &&
4901 receive_messagecount > smtp_accept_queue_per_connection)
4903 session_local_queue_only = TRUE;
4904 queue_only_reason = 2;
4907 /* Initialize local_queue_only from session_local_queue_only. If it is false,
4908 and queue_only_load is set, check that the load average is below it. If it is
4909 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4910 default), we put the whole session into queue_only mode. It then remains this
4911 way for any subsequent messages on the same SMTP connection. This is a
4912 deliberate choice; even though the load average may fall, it doesn't seem
4913 right to deliver later messages on the same call when not delivering earlier
4914 ones. However, there are odd cases where this is not wanted, so this can be
4915 changed by setting queue_only_load_latch false. */
4917 local_queue_only = session_local_queue_only;
4918 if (!local_queue_only && queue_only_load >= 0)
4920 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4921 if (local_queue_only)
4923 queue_only_reason = 3;
4924 if (queue_only_load_latch) session_local_queue_only = TRUE;
4928 /* If running as an MUA wrapper, all queueing options and freezing options
4932 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4934 /* Log the queueing here, when it will get a message id attached, but
4935 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4938 if (local_queue_only) switch(queue_only_reason)
4941 log_write(L_delay_delivery,
4942 LOG_MAIN, "no immediate delivery: more than %d messages "
4943 "received in one connection", smtp_accept_queue_per_connection);
4947 log_write(L_delay_delivery,
4948 LOG_MAIN, "no immediate delivery: load average %.2f",
4949 (double)load_average/1000.0);
4953 /* Else do the delivery unless the ACL or local_scan() called for queue only
4954 or froze the message. Always deliver in a separate process. A fork failure is
4955 not a disaster, as the delivery will eventually happen on a subsequent queue
4956 run. The search cache must be tidied before the fork, as the parent will
4957 do it before exiting. The child will trigger a lookup failure and
4958 thereby defer the delivery if it tries to use (for example) a cached ldap
4959 connection that the parent has called unbind on. */
4961 else if (!queue_only_policy && !deliver_freeze)
4966 if ((pid = fork()) == 0)
4969 close_unwanted(); /* Close unwanted file descriptors and TLS */
4970 exim_nullstd(); /* Ensure std{in,out,err} exist */
4972 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4973 mode, deliver_drop_privilege is forced TRUE). */
4975 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4977 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4979 /* Control does not return here. */
4982 /* No need to re-exec */
4984 rc = deliver_message(message_id, FALSE, FALSE);
4986 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4987 EXIT_SUCCESS : EXIT_FAILURE);
4992 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4993 "process: %s", strerror(errno));
4996 /* In the parent, wait if synchronous delivery is required. This will
4997 always be the case in MUA wrapper mode. */
4999 else if (synchronous_delivery)
5002 while (wait(&status) != pid);
5003 if ((status & 0x00ff) != 0)
5004 log_write(0, LOG_MAIN|LOG_PANIC,
5005 "process %d crashed with signal %d while delivering %s",
5006 (int)pid, status & 0x00ff, message_id);
5007 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5011 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5012 automatically reaps children (see comments above the loop), clear away any
5013 finished subprocesses here, in case there are lots of messages coming in
5014 from the same source. */
5016 #ifndef SIG_IGN_WORKS
5017 while (waitpid(-1, NULL, WNOHANG) > 0);
5021 exim_exit(EXIT_SUCCESS); /* Never returns */
5022 return 0; /* To stop compiler warning */