1 /* $Cambridge: exim/src/src/exim.c,v 1.9.2.1 2004/12/02 09:15:11 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2004 */
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 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
402 for (i = 0; i <= 2; i++)
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) dup2(devnull, i);
412 if (devnull > 2) close(devnull);
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
441 Exception: We do want it for synchronous delivery!
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
460 tls_close(FALSE); /* Shut down the TLS library */
462 close(fileno(smtp_in));
463 close(fileno(smtp_out));
468 close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address.
592 address the address, with possible port on the end
594 Returns: the port, or zero if there isn't one
595 bombs out on a syntax error
599 check_port(uschar *address)
601 int port = host_extract_port(address);
602 if (!string_is_ip_address(address, NULL))
604 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
612 /*************************************************
613 * Test/verify an address *
614 *************************************************/
616 /* This function is called by the -bv and -bt code. It extracts a working
617 address from a full RFC 822 address. This isn't really necessary per se, but it
618 has the effect of collapsing source routes.
622 flags flag bits for verify_address()
623 exit_value to be set for failures
629 test_address(uschar *s, int flags, int *exit_value)
631 int start, end, domain;
632 uschar *parse_error = NULL;
633 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
637 fprintf(stdout, "syntax error: %s\n", parse_error);
642 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
643 -1, -1, NULL, NULL, NULL);
644 if (rc == FAIL) *exit_value = 2;
645 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
651 /*************************************************
652 * Decode bit settings for log/debug *
653 *************************************************/
655 /* This function decodes a string containing bit settings in the form of +name
656 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
657 also recognizes a numeric setting of the form =<number>, but this is not
658 intended for user use. It's an easy way for Exim to pass the debug settings
659 when it is re-exec'ed.
661 The log options are held in two unsigned ints (because there became too many
662 for one). The top bit in the table means "put in 2nd selector". This does not
663 yet apply to debug options, so the "=" facility sets only the first selector.
665 A bad value for a debug setting is treated as an unknown option - error message
666 to stderr and die. For log settings, which come from the configuration file,
667 we write to the log on the way out...
670 selector1 address of the first bit string
671 selector2 address of the second bit string, or NULL
672 string the configured string
673 options the table of option names
675 which "log" or "debug"
677 Returns: nothing on success - bomb out on failure
681 decode_bits(unsigned int *selector1, unsigned int *selector2, uschar *string,
682 bit_table *options, int count, uschar *which)
685 if (string == NULL) return;
689 char *end; /* Not uschar */
690 *selector1 = strtoul(CS string+1, &end, 0);
691 if (*end == 0) return;
692 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
697 /* Handle symbolic setting */
704 bit_table *start, *end;
706 while (isspace(*string)) string++;
707 if (*string == 0) return;
709 if (*string != '+' && *string != '-')
711 errmsg = string_sprintf("malformed %s_selector setting: "
712 "+ or - expected but found \"%s\"", which, string);
716 adding = *string++ == '+';
718 while (isalnum(*string) || *string == '_') string++;
722 end = options + count;
726 bit_table *middle = start + (end - start)/2;
727 int c = Ustrncmp(s, middle->name, len);
730 if (middle->name[len] != 0) c = -1; else
732 unsigned int bit = middle->bit;
733 unsigned int *selector;
735 /* The value with all bits set means "set all bits in both selectors"
736 in the case where two are being handled. However, the top bit in the
737 second selector is never set. */
739 if (bit == 0xffffffff)
741 *selector1 = adding? bit : 0;
742 if (selector2 != NULL) *selector2 = adding? 0x7fffffff : 0;
745 /* Otherwise, the 0x80000000 bit means "this value, without the top
746 bit, belongs in the second selector". */
750 if ((bit & 0x80000000) != 0)
752 selector = selector2;
755 else selector = selector1;
756 if (adding) *selector |= bit; else *selector &= ~bit;
758 break; /* Out of loop to match selector name */
761 if (c < 0) end = middle; else start = middle + 1;
762 } /* Loop to match selector name */
766 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
767 adding? '+' : '-', len, s);
770 } /* Loop for selector names */
772 /* Handle disasters */
775 if (Ustrcmp(which, "debug") == 0)
777 fprintf(stderr, "exim: %s\n", errmsg);
780 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
785 /*************************************************
786 * Show supported features *
787 *************************************************/
789 /* This function is called for -bV and for -d to output the optional features
790 of the current Exim binary.
792 Arguments: a FILE for printing
797 show_whats_supported(FILE *f)
799 #ifdef DB_VERSION_STRING
800 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
801 #elif defined(BTREEVERSION) && defined(HASHVERSION)
803 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
805 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
807 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
808 fprintf(f, "Probably ndbm\n");
809 #elif defined(USE_TDB)
810 fprintf(f, "Using tdb\n");
813 fprintf(f, "Probably GDBM (native mode)\n");
815 fprintf(f, "Probably GDBM (compatibility mode)\n");
819 fprintf(f, "Support for:");
821 fprintf(f, " iconv()");
832 #ifdef USE_TCP_WRAPPERS
833 fprintf(f, " TCPwrappers");
837 fprintf(f, " GnuTLS");
839 fprintf(f, " OpenSSL");
842 #ifdef WITH_CONTENT_SCAN
843 fprintf(f, " Content_Scanning");
847 fprintf(f, "Lookups:");
848 #ifdef LOOKUP_LSEARCH
849 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
855 fprintf(f, " dbm dbmnz");
858 fprintf(f, " dnsdb");
860 #ifdef LOOKUP_DSEARCH
861 fprintf(f, " dsearch");
864 fprintf(f, " ibase");
867 fprintf(f, " ldap ldapdn ldapm");
870 fprintf(f, " mysql");
873 fprintf(f, " nis nis0");
875 #ifdef LOOKUP_NISPLUS
876 fprintf(f, " nisplus");
879 fprintf(f, " oracle");
882 fprintf(f, " passwd");
885 fprintf(f, " pgsql");
888 fprintf(f, " testdb");
891 fprintf(f, " whoson");
895 fprintf(f, "Authenticators:");
897 fprintf(f, " cram_md5");
899 #ifdef AUTH_CYRUS_SASL
900 fprintf(f, " cyrus_sasl");
902 #ifdef AUTH_PLAINTEXT
903 fprintf(f, " plaintext");
910 fprintf(f, "Routers:");
912 fprintf(f, " accept");
914 #ifdef ROUTER_DNSLOOKUP
915 fprintf(f, " dnslookup");
917 #ifdef ROUTER_IPLITERAL
918 fprintf(f, " ipliteral");
920 #ifdef ROUTER_IPLOOKUP
921 fprintf(f, " iplookup");
923 #ifdef ROUTER_MANUALROUTE
924 fprintf(f, " manualroute");
926 #ifdef ROUTER_QUERYPROGRAM
927 fprintf(f, " queryprogram");
929 #ifdef ROUTER_REDIRECT
930 fprintf(f, " redirect");
934 fprintf(f, "Transports:");
935 #ifdef TRANSPORT_APPENDFILE
936 fprintf(f, " appendfile");
937 #ifdef SUPPORT_MAILDIR
938 fprintf(f, "/maildir");
940 #ifdef SUPPORT_MAILSTORE
941 fprintf(f, "/mailstore");
947 #ifdef TRANSPORT_AUTOREPLY
948 fprintf(f, " autoreply");
950 #ifdef TRANSPORT_LMTP
953 #ifdef TRANSPORT_PIPE
956 #ifdef TRANSPORT_SMTP
961 if (fixed_never_users[0] > 0)
964 fprintf(f, "Fixed never_users: ");
965 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
966 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
967 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
974 /*************************************************
975 * Quote a local part *
976 *************************************************/
978 /* This function is used when a sender address or a From: or Sender: header
979 line is being created from the caller's login, or from an authenticated_id. It
980 applies appropriate quoting rules for a local part.
982 Argument: the local part
983 Returns: the local part, quoted if necessary
987 local_part_quote(uschar *lpart)
989 BOOL needs_quote = FALSE;
994 for (t = lpart; !needs_quote && *t != 0; t++)
996 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
997 (*t != '.' || t == lpart || t[1] == 0);
1000 if (!needs_quote) return lpart;
1003 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1007 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1010 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1013 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1014 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1015 yield = string_cat(yield, &size, &ptr, nq, 1);
1019 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1027 /*************************************************
1028 * Load readline() functions *
1029 *************************************************/
1031 /* This function is called from testing executions that read data from stdin,
1032 but only when running as the calling user. Currently, only -be does this. The
1033 function loads the readline() function library and passes back the functions.
1034 On some systems, it needs the curses library, so load that too, but try without
1035 it if loading fails. All this functionality has to be requested at build time.
1038 fn_readline_ptr pointer to where to put the readline pointer
1039 fn_addhist_ptr pointer to where to put the addhistory function
1041 Returns: the dlopen handle or NULL on failure
1045 set_readline(char * (**fn_readline_ptr)(char *),
1046 char * (**fn_addhist_ptr)(char *))
1049 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1051 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1052 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1054 if (dlhandle != NULL)
1056 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1057 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1061 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1070 /*************************************************
1071 * Get a line from stdin for testing things *
1072 *************************************************/
1074 /* This function is called when running tests that can take a number of lines
1075 of input (for example, -be and -bt). It handles continuations and trailing
1076 spaces. And prompting and a blank line output on eof. If readline() is in use,
1077 the arguments are non-NULL and provide the relevant functions.
1080 fn_readline readline function or NULL
1081 fn_addhist addhist function or NULL
1083 Returns: pointer to dynamic memory, or NULL at end of file
1087 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1092 uschar *yield = NULL;
1094 if (fn_readline == NULL) printf("> ");
1098 uschar buffer[1024];
1102 char *readline_line = NULL;
1103 if (fn_readline != NULL)
1105 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1106 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1107 p = US readline_line;
1112 /* readline() not in use */
1115 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1119 /* Handle the line */
1121 ss = p + (int)Ustrlen(p);
1122 while (ss > p && isspace(ss[-1])) ss--;
1126 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1129 yield = string_cat(yield, &size, &ptr, p, ss - p);
1132 if (fn_readline != NULL) free(readline_line);
1135 if (ss == p || yield[ptr-1] != '\\')
1143 if (yield == NULL) printf("\n");
1149 /*************************************************
1150 * Entry point and high-level code *
1151 *************************************************/
1153 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1154 the appropriate action. All the necessary functions are present in the one
1155 binary. I originally thought one should split it up, but it turns out that so
1156 much of the apparatus is needed in each chunk that one might as well just have
1157 it all available all the time, which then makes the coding easier as well.
1160 argc count of entries in argv
1161 argv argument strings, with argv[0] being the program name
1163 Returns: EXIT_SUCCESS if terminated successfully
1164 EXIT_FAILURE otherwise, except when a message has been sent
1165 to the sender, and -oee was given
1169 main(int argc, char **cargv)
1171 uschar **argv = USS cargv;
1172 int arg_receive_timeout = -1;
1173 int arg_smtp_receive_timeout = -1;
1174 int arg_error_handling = error_handling;
1178 int list_queue_option = 0;
1180 int msg_action_arg = -1;
1181 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1182 int queue_only_reason = 0;
1184 int perl_start_option = 0;
1186 int recipients_arg = argc;
1187 int sender_address_domain = 0;
1188 int test_retry_arg = -1;
1189 int test_rewrite_arg = -1;
1190 BOOL arg_queue_only = FALSE;
1191 BOOL bi_option = FALSE;
1192 BOOL checking = FALSE;
1193 BOOL count_queue = FALSE;
1194 BOOL expansion_test = FALSE;
1195 BOOL extract_recipients = FALSE;
1196 BOOL forced_delivery = FALSE;
1197 BOOL f_end_dot = FALSE;
1198 BOOL deliver_give_up = FALSE;
1199 BOOL list_queue = FALSE;
1200 BOOL list_options = FALSE;
1201 BOOL local_queue_only;
1203 BOOL one_msg_action = FALSE;
1204 BOOL queue_only_set = FALSE;
1205 BOOL receiving_message = TRUE;
1207 BOOL removed_privilege = FALSE;
1208 BOOL verify_address_mode = FALSE;
1209 BOOL verify_as_sender = FALSE;
1210 BOOL version_printed = FALSE;
1211 uschar *alias_arg = NULL;
1212 uschar *called_as = US"";
1213 uschar *start_queue_run_id = NULL;
1214 uschar *stop_queue_run_id = NULL;
1215 uschar *ftest_domain = NULL;
1216 uschar *ftest_localpart = NULL;
1217 uschar *ftest_prefix = NULL;
1218 uschar *ftest_suffix = NULL;
1219 uschar *real_sender_address;
1220 uschar *originator_home = US"/";
1221 BOOL ftest_system = FALSE;
1225 struct stat statbuf;
1226 pid_t passed_qr_pid = (pid_t)0;
1227 int passed_qr_pipe = -1;
1228 gid_t group_list[NGROUPS_MAX];
1230 /* Possible options for -R and -S */
1232 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1234 /* Need to define this in case we need to change the environment in order
1235 to get rid of a bogus time zone. We have to make it char rather than uschar
1236 because some OS define it in /usr/include/unistd.h. */
1238 extern char **environ;
1240 /* If the Exim user and/or group and/or the configuration file owner/group were
1241 defined by ref:name at build time, we must now find the actual uid/gid values.
1242 This is a feature to make the lives of binary distributors easier. */
1244 #ifdef EXIM_USERNAME
1245 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1247 exim_gid = pw->pw_gid;
1251 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1257 #ifdef EXIM_GROUPNAME
1258 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1260 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1266 #ifdef CONFIGURE_OWNERNAME
1267 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1269 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1270 CONFIGURE_OWNERNAME);
1275 #ifdef CONFIGURE_GROUPNAME
1276 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1278 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1279 CONFIGURE_GROUPNAME);
1284 /* In the Cygwin environment, some initialization needs doing. It is fudged
1285 in by means of this macro. */
1291 /* Check a field which is patched when we are running Exim within its
1292 testing harness; do a fast initial check, and then the whole thing. */
1294 running_in_test_harness =
1295 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1297 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1298 at the start of a program; however, it seems that some environments do not
1299 follow this. A "strange" locale can affect the formatting of timestamps, so we
1302 setlocale(LC_ALL, "C");
1304 /* Set up the default handler for timing using alarm(). */
1306 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1308 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1309 because store_malloc writes a log entry on failure. */
1311 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1312 if (log_buffer == NULL)
1314 fprintf(stderr, "exim: failed to get store for log buffer\n");
1318 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1319 NULL when the daemon is run and the file is closed. We have to use this
1320 indirection, because some systems don't allow writing to the variable "stderr".
1323 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1325 /* Arrange for the PCRE regex library to use our store functions. Note that
1326 the normal calls are actually macros that add additional arguments for
1327 debugging purposes so we have to assign specially constructed functions here.
1328 The default is to use store in the stacking pool, but this is overridden in the
1329 regex_must_compile() function. */
1331 pcre_malloc = function_store_get;
1332 pcre_free = function_dummy_free;
1334 /* Ensure there is a big buffer for temporary use in several places. It is put
1335 in malloc store so that it can be freed for enlargement if necessary. */
1337 big_buffer = store_malloc(big_buffer_size);
1339 /* Set up the handler for the data request signal, and set the initial
1340 descriptive text. */
1342 set_process_info("initializing");
1343 os_restarting_signal(SIGUSR1, usr1_handler);
1345 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1346 in the daemon code. For the rest of Exim's uses, we ignore it. */
1348 signal(SIGHUP, SIG_IGN);
1350 /* We don't want to die on pipe errors as the code is written to handle
1351 the write error instead. */
1353 signal(SIGPIPE, SIG_IGN);
1355 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1356 set to SIG_IGN. This causes subprocesses that complete before the parent
1357 process waits for them not to hang around, so when Exim calls wait(), nothing
1358 is there. The wait() code has been made robust against this, but let's ensure
1359 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1360 ending status. We use sigaction rather than plain signal() on those OS where
1361 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1362 problem on AIX with this.) */
1366 struct sigaction act;
1367 act.sa_handler = SIG_DFL;
1368 sigemptyset(&(act.sa_mask));
1370 sigaction(SIGCHLD, &act, NULL);
1373 signal(SIGCHLD, SIG_DFL);
1376 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1381 /* Set up the version number. Set up the leading 'E' for the external form of
1382 message ids, set the pointer to the internal form, and initialize it to
1383 indicate no message being processed. */
1386 message_id_option[0] = '-';
1387 message_id_external = message_id_option + 1;
1388 message_id_external[0] = 'E';
1389 message_id = message_id_external + 1;
1392 /* Set the umask to zero so that any files that Exim creates are created
1393 with the modes that it specifies. */
1397 /* Precompile the regular expression for matching a message id. Keep this in
1398 step with the code that generates ids in the accept.c module. We need to do
1399 this here, because the -M options check their arguments for syntactic validity
1400 using mac_ismsgid, which uses this. */
1403 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1405 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1406 this seems to be a generally accepted convention, since one finds symbolic
1407 links called "mailq" in standard OS configurations. */
1409 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1410 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1413 receiving_message = FALSE;
1414 called_as = US"-mailq";
1417 /* If the program is called as "rmail" treat it as equivalent to
1418 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1419 i.e. preventing a single dot on a line from terminating the message, and
1420 returning with zero return code, even in cases of error (provided an error
1421 message has been sent). */
1423 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1424 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1427 called_as = US"-rmail";
1428 errors_sender_rc = EXIT_SUCCESS;
1431 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1432 this is a smail convention. */
1434 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1435 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1437 smtp_input = smtp_batched_input = TRUE;
1438 called_as = US"-rsmtp";
1441 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1442 this is a smail convention. */
1444 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1445 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1448 receiving_message = FALSE;
1449 called_as = US"-runq";
1452 /* If the program is called as "newaliases" treat it as equivalent to
1453 "exim -bi"; this is a sendmail convention. */
1455 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1456 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1459 receiving_message = FALSE;
1460 called_as = US"-newaliases";
1463 /* Save the original effective uid for a couple of uses later. It should
1464 normally be root, but in some esoteric environments it may not be. */
1466 original_euid = geteuid();
1468 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1469 to be the same as the real ones. This makes a difference only if Exim is setuid
1470 (or setgid) to something other than root, which could be the case in some
1471 special configurations. */
1473 real_uid = getuid();
1474 real_gid = getgid();
1476 if (real_uid == root_uid)
1482 /* If neither the original real uid nor the original euid was root, Exim is
1483 running in an unprivileged state. */
1485 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1487 /* If the first argument is --help, pretend there are no arguments. This will
1488 cause a brief message to be given. */
1490 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1492 /* Scan the program's arguments. Some can be dealt with right away; others are
1493 simply recorded for checking and handling afterwards. Do a high-level switch
1494 on the second character (the one after '-'), to save some effort. */
1496 for (i = 1; i < argc; i++)
1498 BOOL badarg = FALSE;
1499 uschar *arg = argv[i];
1503 /* An argument not starting with '-' is the start of a recipients list;
1504 break out of the options-scanning loop. */
1512 /* An option consistion of -- terminates the options */
1514 if (Ustrcmp(arg, "--") == 0)
1516 recipients_arg = i + 1;
1520 /* Handle flagged options */
1522 switchchar = arg[1];
1525 /* Make all -ex options synonymous with -oex arguments, since that
1526 is assumed by various callers. Also make -qR options synonymous with -R
1527 options, as that seems to be required as well. Allow for -qqR too, and
1528 the same for -S options. */
1530 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1531 Ustrncmp(arg+1, "qR", 2) == 0 ||
1532 Ustrncmp(arg+1, "qS", 2) == 0)
1534 switchchar = arg[2];
1537 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1539 switchchar = arg[3];
1541 queue_2stage = TRUE;
1544 /* Make -r synonymous with -f, since it is a documented alias */
1546 else if (arg[1] == 'r') switchchar = 'f';
1548 /* Make -ov synonymous with -v */
1550 else if (Ustrcmp(arg, "-ov") == 0)
1556 /* High-level switch on active initial letter */
1560 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1561 so has no need of it. */
1564 if (*argrest == 0) i++; /* Skip over the type */
1569 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1571 /* -bd: Run in daemon mode, awaiting SMTP connections.
1572 -bdf: Ditto, but in the foreground.
1575 if (*argrest == 'd')
1577 daemon_listen = TRUE;
1578 if (*(++argrest) == 'f') background_daemon = FALSE;
1579 else if (*argrest != 0) { badarg = TRUE; break; }
1582 /* -be: Run in expansion test mode */
1584 else if (*argrest == 'e')
1585 expansion_test = checking = TRUE;
1587 /* -bf: Run in mail filter testing mode
1588 -bF: Ditto, but for system filters
1589 -bfd: Set domain for filter testing
1590 -bfl: Set local part for filter testing
1591 -bfp: Set prefix for filter testing
1592 -bfs: Set suffix for filter testing
1595 else if (*argrest == 'f' || *argrest == 'F')
1597 ftest_system = *argrest++ == 'F';
1600 if(++i < argc) filter_test = argv[i]; else
1602 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1610 fprintf(stderr, "exim: string expected after %s\n", arg);
1613 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1614 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1615 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1616 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1617 else { badarg = TRUE; break; }
1621 /* -bh: Host checking - an IP address must follow. */
1623 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1625 if (++i >= argc) { badarg = TRUE; break; }
1626 sender_host_address = argv[i];
1627 host_checking = checking = log_testing_mode = TRUE;
1628 host_checking_callout = argrest[1] == 'c';
1631 /* -bi: This option is used by sendmail to initialize *the* alias file,
1632 though it has the -oA option to specify a different file. Exim has no
1633 concept of *the* alias file, but since Sun's YP make script calls
1634 sendmail this way, some support must be provided. */
1636 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1638 /* -bm: Accept and deliver message - the default option. Reinstate
1639 receiving_message, which got turned off for all -b options. */
1641 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1643 /* -bnq: For locally originating messages, do not qualify unqualified
1644 addresses. In the envelope, this causes errors; in header lines they
1647 else if (Ustrcmp(argrest, "nq") == 0)
1649 allow_unqualified_sender = FALSE;
1650 allow_unqualified_recipient = FALSE;
1653 /* -bpxx: List the contents of the mail queue, in various forms. If
1654 the option is -bpc, just a queue count is needed. Otherwise, if the
1655 first letter after p is r, then order is random. */
1657 else if (*argrest == 'p')
1659 if (*(++argrest) == 'c')
1662 if (*(++argrest) != 0) badarg = TRUE;
1666 if (*argrest == 'r')
1668 list_queue_option = 8;
1671 else list_queue_option = 0;
1675 /* -bp: List the contents of the mail queue, top-level only */
1677 if (*argrest == 0) {}
1679 /* -bpu: List the contents of the mail queue, top-level undelivered */
1681 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1683 /* -bpa: List the contents of the mail queue, including all delivered */
1685 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1687 /* Unknown after -bp[r] */
1697 /* -bP: List the configuration variables given as the address list.
1698 Force -v, so configuration errors get displayed. */
1700 else if (Ustrcmp(argrest, "P") == 0)
1702 list_options = TRUE;
1703 debug_selector |= D_v;
1704 debug_file = stderr;
1707 /* -brt: Test retry configuration lookup */
1709 else if (Ustrcmp(argrest, "rt") == 0)
1711 test_retry_arg = i + 1;
1715 /* -brw: Test rewrite configuration */
1717 else if (Ustrcmp(argrest, "rw") == 0)
1719 test_rewrite_arg = i + 1;
1723 /* -bS: Read SMTP commands on standard input, but produce no replies -
1724 all errors are reported by sending messages. */
1726 else if (Ustrcmp(argrest, "S") == 0)
1727 smtp_input = smtp_batched_input = receiving_message = TRUE;
1729 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1730 on standard output. */
1732 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1734 /* -bt: address testing mode */
1736 else if (Ustrcmp(argrest, "t") == 0)
1737 address_test_mode = checking = log_testing_mode = TRUE;
1739 /* -bv: verify addresses */
1741 else if (Ustrcmp(argrest, "v") == 0)
1742 verify_address_mode = checking = log_testing_mode = TRUE;
1744 /* -bvs: verify sender addresses */
1746 else if (Ustrcmp(argrest, "vs") == 0)
1748 verify_address_mode = checking = log_testing_mode = TRUE;
1749 verify_as_sender = TRUE;
1752 /* -bV: Print version string and support details */
1754 else if (Ustrcmp(argrest, "V") == 0)
1756 printf("Exim version %s #%s built %s\n", version_string,
1757 version_cnumber, version_date);
1758 printf("%s\n", CS version_copyright);
1759 version_printed = TRUE;
1760 show_whats_supported(stdout);
1767 /* -C: change configuration file list; ignore if it isn't really
1768 a change! Enforce a prefix check if required. */
1773 if(++i < argc) argrest = argv[i]; else
1774 { badarg = TRUE; break; }
1776 if (Ustrcmp(config_main_filelist, argrest) != 0)
1778 #ifdef ALT_CONFIG_PREFIX
1780 int len = Ustrlen(ALT_CONFIG_PREFIX);
1781 uschar *list = argrest;
1783 while((filename = string_nextinlist(&list, &sep, big_buffer,
1784 big_buffer_size)) != NULL)
1786 if ((Ustrlen(filename) < len ||
1787 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1788 Ustrstr(filename, "/../") != NULL) &&
1789 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1791 fprintf(stderr, "-C Permission denied\n");
1797 config_main_filelist = argrest;
1798 config_changed = TRUE;
1803 /* -D: set up a macro definition */
1806 #ifdef DISABLE_D_OPTION
1807 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1812 macro_item *mlast = NULL;
1815 uschar *s = argrest;
1817 while (isspace(*s)) s++;
1819 if (*s < 'A' || *s > 'Z')
1821 fprintf(stderr, "exim: macro name set by -D must start with "
1822 "an upper case letter\n");
1826 while (isalnum(*s) || *s == '_')
1828 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1832 if (ptr == 0) { badarg = TRUE; break; }
1833 while (isspace(*s)) s++;
1836 if (*s++ != '=') { badarg = TRUE; break; }
1837 while (isspace(*s)) s++;
1840 for (m = macros; m != NULL; m = m->next)
1842 if (Ustrcmp(m->name, name) == 0)
1844 fprintf(stderr, "exim: duplicated -D in command line\n");
1850 m = store_get(sizeof(macro_item) + Ustrlen(name));
1852 m->command_line = TRUE;
1853 if (mlast == NULL) macros = m; else mlast->next = m;
1854 Ustrcpy(m->name, name);
1855 m->replacement = string_copy(s);
1857 if (clmacro_count >= MAX_CLMACROS)
1859 fprintf(stderr, "exim: too many -D options on command line\n");
1862 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1868 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1869 The latter is now a no-op, retained for compatibility only. If -dd is used,
1870 debugging subprocesses of the daemon is disabled. */
1873 if (Ustrcmp(argrest, "ropcr") == 0)
1875 /* drop_cr = TRUE; */
1878 /* Use an intermediate variable so that we don't set debugging while
1879 decoding the debugging bits. */
1883 unsigned int selector = D_default;
1886 if (*argrest == 'd')
1888 debug_daemon = TRUE;
1892 decode_bits(&selector, NULL, argrest, debug_options,
1893 debug_options_count, US"debug");
1894 debug_selector = selector;
1899 /* -E: This is a local error message. This option is not intended for
1900 external use at all, but is not restricted to trusted callers because it
1901 does no harm (just suppresses certain error messages) and if Exim is run
1902 not setuid root it won't always be trusted when it generates error
1903 messages using this option. If there is a message id following -E, point
1904 message_reference at it, for logging. */
1907 local_error_message = TRUE;
1908 if (mac_ismsgid(argrest)) message_reference = argrest;
1912 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1913 option, so it looks as if historically the -oex options are also callable
1914 without the leading -o. So we have to accept them. Before the switch,
1915 anything starting -oe has been converted to -e. Exim does not support all
1916 of the sendmail error options. */
1919 if (Ustrcmp(argrest, "e") == 0)
1921 arg_error_handling = ERRORS_SENDER;
1922 errors_sender_rc = EXIT_SUCCESS;
1924 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1925 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1926 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1927 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1932 /* -F: Set sender's full name, used instead of the gecos entry from
1933 the password file. Since users can usually alter their gecos entries,
1934 there's no security involved in using this instead. The data can follow
1935 the -F or be in the next argument. */
1940 if(++i < argc) argrest = argv[i]; else
1941 { badarg = TRUE; break; }
1943 originator_name = argrest;
1947 /* -f: Set sender's address - this value is only actually used if Exim is
1948 run by a trusted user, or if untrusted_set_sender is set and matches the
1949 address, except that the null address can always be set by any user. The
1950 test for this happens later, when the value given here is ignored when not
1951 permitted. For an untrusted user, the actual sender is still put in Sender:
1952 if it doesn't match the From: header (unless no_local_from_check is set).
1953 The data can follow the -f or be in the next argument. The -r switch is an
1954 obsolete form of -f but since there appear to be programs out there that
1955 use anything that sendmail has ever supported, better accept it - the
1956 synonymizing is done before the switch above.
1958 At this stage, we must allow domain literal addresses, because we don't
1959 know what the setting of allow_domain_literals is yet. Ditto for trailing
1960 dots and strip_trailing_dot. */
1968 if (i+1 < argc) argrest = argv[++i]; else
1969 { badarg = TRUE; break; }
1973 sender_address = string_sprintf(""); /* Ensure writeable memory */
1977 uschar *temp = argrest + Ustrlen(argrest) - 1;
1978 while (temp >= argrest && isspace(*temp)) temp--;
1979 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
1980 allow_domain_literals = TRUE;
1981 strip_trailing_dot = TRUE;
1982 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
1983 &sender_address_domain, TRUE);
1984 allow_domain_literals = FALSE;
1985 strip_trailing_dot = FALSE;
1986 if (sender_address == NULL)
1988 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
1989 return EXIT_FAILURE;
1992 sender_address_forced = TRUE;
1996 /* This is some Sendmail thing which can be ignored */
2001 /* -h: Set the hop count for an incoming message. Exim does not currently
2002 support this; it always computes it by counting the Received: headers.
2003 To put it in will require a change to the spool header file format. */
2008 if(++i < argc) argrest = argv[i]; else
2009 { badarg = TRUE; break; }
2011 if (!isdigit(*argrest)) badarg = TRUE;
2015 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2016 not to be documented for sendmail but mailx (at least) uses it) */
2019 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2024 receiving_message = FALSE;
2026 /* -MC: continue delivery of another message via an existing open
2027 file descriptor. This option is used for an internal call by the
2028 smtp transport when there is a pending message waiting to go to an
2029 address to which it has got a connection. Five subsequent arguments are
2030 required: transport name, host name, IP address, sequence number, and
2031 message_id. Transports may decline to create new processes if the sequence
2032 number gets too big. The channel is stdin. This (-MC) must be the last
2033 argument. There's a subsequent check that the real-uid is privileged.
2035 If we are running in the test harness. delay for a bit, to let the process
2036 that set this one up complete. This makes for repeatability of the logging,
2039 if (Ustrcmp(argrest, "C") == 0)
2043 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2044 return EXIT_FAILURE;
2047 if (msg_action_arg >= 0)
2049 fprintf(stderr, "exim: incompatible arguments\n");
2050 return EXIT_FAILURE;
2053 continue_transport = argv[++i];
2054 continue_hostname = argv[++i];
2055 continue_host_address = argv[++i];
2056 continue_sequence = Uatoi(argv[++i]);
2057 msg_action = MSG_DELIVER;
2058 msg_action_arg = ++i;
2059 forced_delivery = TRUE;
2060 queue_run_pid = passed_qr_pid;
2061 queue_run_pipe = passed_qr_pipe;
2063 if (!mac_ismsgid(argv[i]))
2065 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2067 return EXIT_FAILURE;
2070 if (running_in_test_harness) millisleep(500);
2074 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2075 precedes -MC (see above). The flag indicates that the host to which
2076 Exim is connected has accepted an AUTH sequence. */
2078 else if (Ustrcmp(argrest, "CA") == 0)
2080 smtp_authenticated = TRUE;
2084 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2085 it preceded -MC (see above) */
2087 else if (Ustrcmp(argrest, "CP") == 0)
2089 smtp_use_pipelining = TRUE;
2093 /* -MCQ: pass on the pid of the queue-running process that started
2094 this chain of deliveries and the fd of its synchronizing pipe; this
2095 is useful only when it precedes -MC (see above) */
2097 else if (Ustrcmp(argrest, "CQ") == 0)
2099 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2101 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2106 /* -MCS: set the smtp_use_size flag; this is useful only when it
2107 precedes -MC (see above) */
2109 else if (Ustrcmp(argrest, "CS") == 0)
2111 smtp_use_size = TRUE;
2115 /* -MCT: set the tls_offered flag; this is useful only when it
2116 precedes -MC (see above). The flag indicates that the host to which
2117 Exim is connected has offered TLS support. */
2120 else if (Ustrcmp(argrest, "CT") == 0)
2127 /* -M[x]: various operations on the following list of message ids:
2128 -M deliver the messages, ignoring next retry times and thawing
2129 -Mc deliver the messages, checking next retry times, no thawing
2130 -Mf freeze the messages
2131 -Mg give up on the messages
2132 -Mt thaw the messages
2133 -Mrm remove the messages
2134 In the above cases, this must be the last option. There are also the
2135 following options which are followed by a single message id, and which
2136 act on that message. Some of them use the "recipient" addresses as well.
2137 -Mar add recipient(s)
2138 -Mmad mark all recipients delivered
2139 -Mmd mark recipients(s) delivered
2146 else if (*argrest == 0)
2148 msg_action = MSG_DELIVER;
2149 forced_delivery = deliver_force_thaw = TRUE;
2151 else if (Ustrcmp(argrest, "ar") == 0)
2153 msg_action = MSG_ADD_RECIPIENT;
2154 one_msg_action = TRUE;
2156 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2157 else if (Ustrcmp(argrest, "es") == 0)
2159 msg_action = MSG_EDIT_SENDER;
2160 one_msg_action = TRUE;
2162 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2163 else if (Ustrcmp(argrest, "g") == 0)
2165 msg_action = MSG_DELIVER;
2166 deliver_give_up = TRUE;
2168 else if (Ustrcmp(argrest, "mad") == 0)
2170 msg_action = MSG_MARK_ALL_DELIVERED;
2172 else if (Ustrcmp(argrest, "md") == 0)
2174 msg_action = MSG_MARK_DELIVERED;
2175 one_msg_action = TRUE;
2177 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2178 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2179 else if (Ustrcmp(argrest, "vb") == 0)
2181 msg_action = MSG_SHOW_BODY;
2182 one_msg_action = TRUE;
2184 else if (Ustrcmp(argrest, "vh") == 0)
2186 msg_action = MSG_SHOW_HEADER;
2187 one_msg_action = TRUE;
2189 else if (Ustrcmp(argrest, "vl") == 0)
2191 msg_action = MSG_SHOW_LOG;
2192 one_msg_action = TRUE;
2194 else { badarg = TRUE; break; }
2196 /* All the -Mxx options require at least one message id. */
2198 msg_action_arg = i + 1;
2199 if (msg_action_arg >= argc)
2201 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2202 return EXIT_FAILURE;
2205 /* Some require only message ids to follow */
2207 if (!one_msg_action)
2210 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2212 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2214 return EXIT_FAILURE;
2216 goto END_ARG; /* Remaining args are ids */
2219 /* Others require only one message id, possibly followed by addresses,
2220 which will be handled as normal arguments. */
2224 if (!mac_ismsgid(argv[msg_action_arg]))
2226 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2227 argv[msg_action_arg], arg);
2228 return EXIT_FAILURE;
2235 /* Some programs seem to call the -om option without the leading o;
2236 for sendmail it askes for "me too". Exim always does this. */
2239 if (*argrest != 0) badarg = TRUE;
2243 /* -N: don't do delivery - a debugging option that stops transports doing
2244 their thing. It implies debugging at the D_v level. */
2249 dont_deliver = TRUE;
2250 debug_selector |= D_v;
2251 debug_file = stderr;
2257 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2263 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2264 option to the specified value. This form uses long names. We need to handle
2265 -O option=value and -Ooption=value. */
2272 fprintf(stderr, "exim: string expected after -O\n");
2280 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2283 if (*argrest == 'A')
2285 alias_arg = argrest + 1;
2286 if (alias_arg[0] == 0)
2288 if (i+1 < argc) alias_arg = argv[++i]; else
2290 fprintf(stderr, "exim: string expected after -oA\n");
2296 /* -oB: Set a connection message max value for remote deliveries */
2298 else if (*argrest == 'B')
2300 uschar *p = argrest + 1;
2303 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2305 connection_max_messages = 1;
2314 fprintf(stderr, "exim: number expected after -oB\n");
2317 connection_max_messages = Uatoi(p);
2321 /* -odb: background delivery */
2323 else if (Ustrcmp(argrest, "db") == 0)
2325 synchronous_delivery = FALSE;
2326 arg_queue_only = FALSE;
2327 queue_only_set = TRUE;
2330 /* -odf: foreground delivery (smail-compatible option); same effect as
2331 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2334 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2336 synchronous_delivery = TRUE;
2337 arg_queue_only = FALSE;
2338 queue_only_set = TRUE;
2341 /* -odq: queue only */
2343 else if (Ustrcmp(argrest, "dq") == 0)
2345 synchronous_delivery = FALSE;
2346 arg_queue_only = TRUE;
2347 queue_only_set = TRUE;
2350 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2351 but no remote delivery */
2353 else if (Ustrcmp(argrest, "dqs") == 0)
2356 arg_queue_only = FALSE;
2357 queue_only_set = TRUE;
2360 /* -oex: Sendmail error flags. As these are also accepted without the
2361 leading -o prefix, for compatibility with vacation and other callers,
2362 they are handled with -e above. */
2364 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2365 -oitrue: Another sendmail syntax for the same */
2367 else if (Ustrcmp(argrest, "i") == 0 ||
2368 Ustrcmp(argrest, "itrue") == 0)
2371 /* -oM*: Set various characteristics for an incoming message; actually
2372 acted on for trusted callers only. */
2374 else if (*argrest == 'M')
2378 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2382 /* -oMa: Set sender host address */
2384 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2386 /* -oMaa: Set authenticator name */
2388 else if (Ustrcmp(argrest, "Maa") == 0)
2389 sender_host_authenticated = argv[++i];
2391 /* -oMas: setting authenticated sender */
2393 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2395 /* -oMai: setting authenticated id */
2397 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2399 /* -oMi: Set incoming interface address */
2401 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2403 /* -oMr: Received protocol */
2405 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2407 /* -oMs: Set sender host name */
2409 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2411 /* -oMt: Set sender ident */
2413 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2415 /* Else a bad argument */
2424 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2425 seem to call this as -m (undocumented), so that is also accepted (see
2428 else if (Ustrcmp(argrest, "m") == 0) {}
2430 /* -oo: An ancient flag for old-style addresses which still seems to
2431 crop up in some calls (see in SCO). */
2433 else if (Ustrcmp(argrest, "o") == 0) {}
2435 /* -oP <name>: set pid file path for daemon */
2437 else if (Ustrcmp(argrest, "P") == 0)
2438 override_pid_file_path = argv[++i];
2440 /* -or <n>: set timeout for non-SMTP acceptance
2441 -os <n>: set timeout for SMTP acceptance */
2443 else if (*argrest == 'r' || *argrest == 's')
2445 int *tp = (*argrest == 'r')?
2446 &arg_receive_timeout : &arg_smtp_receive_timeout;
2447 if (argrest[1] == 0)
2449 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2451 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2454 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2459 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2461 else if (Ustrcmp(argrest, "X") == 0)
2462 override_local_interfaces = argv[++i];
2464 /* Unknown -o argument */
2470 /* -ps: force Perl startup; -pd force delayed Perl startup */
2474 if (*argrest == 's' && argrest[1] == 0)
2476 perl_start_option = 1;
2479 if (*argrest == 'd' && argrest[1] == 0)
2481 perl_start_option = -1;
2486 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2487 which sets the host protocol and host name */
2491 if (i+1 < argc) argrest = argv[++i]; else
2492 { badarg = TRUE; break; }
2497 uschar *hn = Ustrchr(argrest, ':');
2500 received_protocol = argrest;
2504 received_protocol = string_copyn(argrest, hn - argrest);
2505 sender_host_name = hn + 1;
2512 receiving_message = FALSE;
2514 /* -qq...: Do queue runs in a 2-stage manner */
2516 if (*argrest == 'q')
2518 queue_2stage = TRUE;
2522 /* -qi...: Do only first (initial) deliveries */
2524 if (*argrest == 'i')
2526 queue_run_first_delivery = TRUE;
2530 /* -qf...: Run the queue, forcing deliveries
2531 -qff..: Ditto, forcing thawing as well */
2533 if (*argrest == 'f')
2535 queue_run_force = TRUE;
2536 if (*(++argrest) == 'f')
2538 deliver_force_thaw = TRUE;
2543 /* -q[f][f]l...: Run the queue only on local deliveries */
2545 if (*argrest == 'l')
2547 queue_run_local = TRUE;
2551 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2552 optionally starting from a given message id. */
2554 if (*argrest == 0 &&
2555 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2558 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2559 start_queue_run_id = argv[++i];
2560 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2561 stop_queue_run_id = argv[++i];
2564 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2565 optionally local only. */
2570 queue_interval = readconf_readtime(argrest, 0, FALSE);
2572 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2573 if (queue_interval <= 0)
2575 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2582 case 'R': /* Synonymous with -qR... */
2583 receiving_message = FALSE;
2585 /* -Rf: As -R (below) but force all deliveries,
2586 -Rff: Ditto, but also thaw all frozen messages,
2587 -Rr: String is regex
2588 -Rrf: Regex and force
2589 -Rrff: Regex and force and thaw
2591 in all cases provided there are no further characters in this
2597 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2599 if (Ustrcmp(argrest, rsopts[i]) == 0)
2601 if (i != 2) queue_run_force = TRUE;
2602 if (i >= 2) deliver_selectstring_regex = TRUE;
2603 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2604 argrest += Ustrlen(rsopts[i]);
2609 /* -R: Set string to match in addresses for forced queue run to
2610 pick out particular messages. */
2614 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2616 fprintf(stderr, "exim: string expected after -R\n");
2620 else deliver_selectstring = argrest;
2621 if (queue_interval < 0) queue_interval = 0;
2625 /* -r: an obsolete synonym for -f (see above) */
2628 /* -S: Like -R but works on sender. */
2630 case 'S': /* Synonymous with -qS... */
2631 receiving_message = FALSE;
2633 /* -Sf: As -S (below) but force all deliveries,
2634 -Sff: Ditto, but also thaw all frozen messages,
2635 -Sr: String is regex
2636 -Srf: Regex and force
2637 -Srff: Regex and force and thaw
2639 in all cases provided there are no further characters in this
2645 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2647 if (Ustrcmp(argrest, rsopts[i]) == 0)
2649 if (i != 2) queue_run_force = TRUE;
2650 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2651 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2652 argrest += Ustrlen(rsopts[i]);
2657 /* -S: Set string to match in addresses for forced queue run to
2658 pick out particular messages. */
2662 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2664 fprintf(stderr, "exim: string expected after -S\n");
2668 else deliver_selectstring_sender = argrest;
2669 if (queue_interval < 0) queue_interval = 0;
2672 /* -Tqt is an option that is exclusively for use by the testing suite.
2673 It is not recognized in other circumstances. It allows for the setting up
2674 of explicit "queue times" so that various warning/retry things can be
2675 tested. Otherwise variability of clock ticks etc. cause problems. */
2678 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2679 fudged_queue_times = argv[++i];
2684 /* -t: Set flag to extract recipients from body of message. */
2687 if (*argrest == 0) extract_recipients = TRUE;
2689 /* -ti: Set flag to extract recipients from body of message, and also
2690 specify that dot does not end the message. */
2692 else if (Ustrcmp(argrest, "i") == 0)
2694 extract_recipients = TRUE;
2698 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2701 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2708 /* -U: This means "initial user submission" in sendmail, apparently. The
2709 doc claims that in future sendmail may refuse syntactically invalid
2710 messages instead of fixing them. For the moment, we just ignore it. */
2716 /* -v: verify things - this is a very low-level debugging */
2721 debug_selector |= D_v;
2722 debug_file = stderr;
2728 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2730 The -x flag tells the sendmail command that mail from a local
2731 mail program has National Language Support (NLS) extended characters
2732 in the body of the mail item. The sendmail command can send mail with
2733 extended NLS characters across networks that normally corrupts these
2736 As Exim is 8-bit clean, it just ignores this flag. */
2739 if (*argrest != 0) badarg = TRUE;
2742 /* All other initial characters are errors */
2747 } /* End of high-level switch statement */
2749 /* Failed to recognize the option, or syntax error */
2753 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2754 "option %s\n", arg);
2760 /* Arguments have been processed. Check for incompatibilities. */
2764 (smtp_input || extract_recipients || recipients_arg < argc) &&
2765 (daemon_listen || queue_interval >= 0 || bi_option ||
2766 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2767 filter_test != NULL || (msg_action_arg > 0 && !one_msg_action))
2770 msg_action_arg > 0 &&
2771 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2772 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2775 (daemon_listen || queue_interval >= 0) &&
2776 (sender_address != NULL || list_options || list_queue || checking ||
2780 daemon_listen && queue_interval == 0
2784 (checking || smtp_input || extract_recipients ||
2785 filter_test != NULL || bi_option)
2788 verify_address_mode &&
2789 (address_test_mode || smtp_input || extract_recipients ||
2790 filter_test != NULL || bi_option)
2793 address_test_mode && (smtp_input || extract_recipients ||
2794 filter_test != NULL || bi_option)
2797 smtp_input && (sender_address != NULL || filter_test != NULL ||
2801 deliver_selectstring != NULL && queue_interval < 0
2805 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2809 /* If debugging is set up, set the file and the file descriptor to pass on to
2810 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2811 to run in the foreground. */
2813 if (debug_selector != 0)
2815 debug_file = stderr;
2816 debug_fd = fileno(debug_file);
2817 background_daemon = FALSE;
2818 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2819 if (debug_selector != D_v) /* -v only doesn't show this */
2821 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2822 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2824 show_whats_supported(stderr);
2828 /* When started with root privilege, ensure that the limits on the number of
2829 open files and the number of processes (where that is accessible) are
2830 sufficiently large, or are unset, in case Exim has been called from an
2831 environment where the limits are screwed down. Not all OS have the ability to
2832 change some of these limits. */
2836 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2842 #ifdef RLIMIT_NOFILE
2843 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2845 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2847 rlp.rlim_cur = rlp.rlim_max = 0;
2850 /* I originally chose 1000 as a nice big number that was unlikely to
2851 be exceeded. It turns out that some older OS have a fixed upper limit of
2854 if (rlp.rlim_cur < 1000)
2856 rlp.rlim_cur = rlp.rlim_max = 1000;
2857 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2859 rlp.rlim_cur = rlp.rlim_max = 256;
2860 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2861 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2868 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2870 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2872 rlp.rlim_cur = rlp.rlim_max = 0;
2875 #ifdef RLIM_INFINITY
2876 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2878 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2880 if (rlp.rlim_cur < 1000)
2882 rlp.rlim_cur = rlp.rlim_max = 1000;
2884 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2885 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2891 /* Exim is normally entered as root (but some special configurations are
2892 possible that don't do this). However, it always spins off sub-processes that
2893 set their uid and gid as required for local delivery. We don't want to pass on
2894 any extra groups that root may belong to, so we want to get rid of them all at
2897 We need to obey setgroups() at this stage, before possibly giving up root
2898 privilege for a changed configuration file, but later on we might need to
2899 check on the additional groups for the admin user privilege - can't do that
2900 till after reading the config, which might specify the exim gid. Therefore,
2901 save the group list here first. */
2903 group_count = getgroups(NGROUPS_MAX, group_list);
2905 /* There is a fundamental difference in some BSD systems in the matter of
2906 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2907 known not to be different. On the "different" systems there is a single group
2908 list, and the first entry in it is the current group. On all other versions of
2909 Unix there is a supplementary group list, which is in *addition* to the current
2910 group. Consequently, to get rid of all extraneous groups on a "standard" system
2911 you pass over 0 groups to setgroups(), while on a "different" system you pass
2912 over a single group - the current group, which is always the first group in the
2913 list. Calling setgroups() with zero groups on a "different" system results in
2914 an error return. The following code should cope with both types of system.
2916 However, if this process isn't running as root, setgroups() can't be used
2917 since you have to be root to run it, even if throwing away groups. Not being
2918 root here happens only in some unusual configurations. We just ignore the
2921 if (setgroups(0, NULL) != 0)
2923 if (setgroups(1, group_list) != 0 && !unprivileged)
2925 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2930 /* If the configuration file name has been altered by an argument on the
2931 command line (either a new file name or a macro definition) and the caller is
2932 not root or the exim user, or if this is a filter testing run, remove any
2933 setuid privilege the program has, and run as the underlying user.
2935 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2936 severely restricts the use of -C for some purposes.
2938 Otherwise, set the real ids to the effective values (should be root unless run
2939 from inetd, which it can either be root or the exim uid, if one is configured).
2941 There is a private mechanism for bypassing some of this, in order to make it
2942 possible to test lots of configurations automatically, without having either to
2943 recompile each time, or to patch in an actual configuration file name and other
2944 values (such as the path name). If running in the test harness, pretend that
2945 configuration file changes and macro definitions haven't happened. */
2948 (config_changed || macros != NULL) && /* Config changed, and */
2949 real_uid != root_uid && /* Not root, and */
2950 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2951 real_uid != exim_uid && /* Not exim, and */
2953 !running_in_test_harness /* Not fudged */
2955 expansion_test /* expansion testing */
2957 filter_test != NULL) /* Filter testing */
2959 setgroups(group_count, group_list);
2960 exim_setugid(real_uid, real_gid, FALSE,
2961 US"-C, -D, -be or -bf forces real uid");
2962 removed_privilege = TRUE;
2964 /* In the normal case when Exim is called like this, stderr is available
2965 and should be used for any logging information because attempts to write
2966 to the log will usually fail. To arrange this, we unset really_exim. However,
2967 if no stderr is available there is no point - we might as well have a go
2968 at the log (if it fails, syslog will be written). */
2970 if (log_stderr != NULL) really_exim = FALSE;
2973 /* Privilege is to be retained for the moment. It may be dropped later,
2974 depending on the job that this Exim process has been asked to do. For now, set
2975 the real uid to the effective so that subsequent re-execs of Exim are done by a
2978 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
2980 /* If testing a filter, open the file now, before wasting time doing other
2981 setups and reading the message. */
2983 if (filter_test != NULL)
2985 filter_fd = Uopen(filter_test, O_RDONLY,0);
2988 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test,
2990 return EXIT_FAILURE;
2994 /* Read the main runtime configuration data; this gives up if there
2995 is a failure. It leaves the configuration file open so that the subsequent
2996 configuration data for delivery can be read if needed. */
3000 /* Handle the decoding of logging options. */
3002 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3003 log_options, log_options_count, US"log");
3007 debug_printf("configuration file is %s\n", config_main_filename);
3008 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3009 log_extra_selector);
3012 /* If domain literals are not allowed, check the sender address that was
3013 supplied with -f. Ditto for a stripped trailing dot. */
3015 if (sender_address != NULL)
3017 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3019 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3020 "allowed\n", sender_address);
3021 return EXIT_FAILURE;
3023 if (f_end_dot && !strip_trailing_dot)
3025 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3026 "(trailing dot not allowed)\n", sender_address);
3027 return EXIT_FAILURE;
3031 /* Paranoia check of maximum lengths of certain strings. There is a check
3032 on the length of the log file path in log.c, which will come into effect
3033 if there are any calls to write the log earlier than this. However, if we
3034 get this far but the string is very long, it is better to stop now than to
3035 carry on and (e.g.) receive a message and then have to collapse. The call to
3036 log_write() from here will cause the ultimate panic collapse if the complete
3037 file name exceeds the buffer length. */
3039 if (Ustrlen(log_file_path) > 200)
3040 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3041 "log_file_path is longer than 200 chars: aborting");
3043 if (Ustrlen(pid_file_path) > 200)
3044 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3045 "pid_file_path is longer than 200 chars: aborting");
3047 if (Ustrlen(spool_directory) > 200)
3048 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3049 "spool_directory is longer than 200 chars: aborting");
3051 /* Length check on the process name given to syslog for its TAG field,
3052 which is only permitted to be 32 characters or less. See RFC 3164. */
3054 if (Ustrlen(syslog_processname) > 32)
3055 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3056 "syslog_processname is longer than 32 chars: aborting");
3058 /* In some operating systems, the environment variable TMPDIR controls where
3059 temporary files are created; Exim doesn't use these (apart from when delivering
3060 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3061 If TMPDIR is found in the environment, reset it to the value defined in the
3062 TMPDIR macro, if this macro is defined. */
3067 for (p = USS environ; *p != NULL; p++)
3069 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3070 Ustrcmp(*p+7, TMPDIR) != 0)
3072 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3073 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3075 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3081 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3082 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3083 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3084 called by a user who has set the TZ variable. This then affects the timestamps
3085 in log files and in Received: headers, and any created Date: header lines. The
3086 required timezone is settable in the configuration file, so nothing can be done
3087 about this earlier - but hopefully nothing will normally be logged earlier than
3088 this. We have to make a new environment if TZ is wrong, but don't bother if
3089 timestamps_utc is set, because then all times are in UTC anyway. */
3091 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3093 timestamps_utc = TRUE;
3097 uschar *envtz = US getenv("TZ");
3098 if ((envtz == NULL && timezone_string != NULL) ||
3100 (timezone_string == NULL ||
3101 Ustrcmp(timezone_string, envtz) != 0)))
3103 uschar **p = USS environ;
3107 while (*p++ != NULL) count++;
3108 if (envtz == NULL) count++;
3109 newp = new = malloc(sizeof(uschar *) * (count + 1));
3110 for (p = USS environ; *p != NULL; p++)
3112 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3115 if (timezone_string != NULL)
3117 *newp = malloc(Ustrlen(timezone_string) + 4);
3118 sprintf(CS *newp++, "TZ=%s", timezone_string);
3123 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3124 tod_stamp(tod_log));
3128 /* Handle the case when we have removed the setuid privilege because of -C or
3129 -D. This means that the caller of Exim was not root, and, provided that
3130 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3133 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3134 were running as the exim user defined in the configuration file (different to
3135 the one in the binary). The sysadmin may expect this case to retain privilege
3136 because "the binary was called by the Exim user", but it hasn't, because of the
3137 order in which it handles this stuff. There are two possibilities:
3139 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3140 to do message deliveries. Thus, the fact that it is running as a
3141 non-privileged user is plausible, and might be wanted in some special
3142 configurations. However, really_exim will have been set false when
3143 privilege was dropped, to stop Exim trying to write to its normal log
3144 files. Therefore, re-enable normal log processing, assuming the sysadmin
3145 has set up the log directory correctly.
3147 (2) If deliver_drop_privilege is not set, the configuration won't work as
3148 apparently intended, and so we log a panic message. In order to retain
3149 root for -C or -D, the caller must either be root or the Exim user
3150 defined in the binary (when deliver_drop_ privilege is false).
3152 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3153 built-in exim user or one defined in the configuration. In either event,
3154 re-enable log processing, assuming the sysadmin knows what they are doing. */
3156 if (removed_privilege && (config_changed || macros != NULL) &&
3157 real_uid == exim_uid)
3159 #ifdef ALT_CONFIG_ROOT_ONLY
3160 really_exim = TRUE; /* let logging work normally */
3163 if (deliver_drop_privilege)
3164 really_exim = TRUE; /* let logging work normally */
3166 log_write(0, LOG_MAIN|LOG_PANIC,
3167 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3168 (int)exim_uid, config_changed? "-C" : "-D");
3172 /* Start up Perl interpreter if Perl support is configured and there is a
3173 perl_startup option, and the configuration or the command line specifies
3174 initializing starting. Note that the global variables are actually called
3175 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3178 if (perl_start_option != 0)
3179 opt_perl_at_start = (perl_start_option > 0);
3180 if (opt_perl_at_start && opt_perl_startup != NULL)
3183 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3184 errstr = init_perl(opt_perl_startup);
3187 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3188 return EXIT_FAILURE;
3190 opt_perl_started = TRUE;
3192 #endif /* EXIM_PERL */
3194 /* Log the arguments of the call if the configuration file said so. This is
3195 a debugging feature for finding out what arguments certain MUAs actually use.
3196 Don't attempt it if logging is disabled, or if listing variables or if
3197 verifying/testing addresses or expansions. */
3199 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3200 && !list_options && !checking)
3203 uschar *p = big_buffer;
3205 (void)getcwd(CS p+4, big_buffer_size - 4);
3207 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3209 for (i = 0; i < argc; i++)
3211 int len = Ustrlen(argv[i]);
3214 if (p + len + 8 >= big_buffer + big_buffer_size)
3217 log_write(0, LOG_MAIN, "%s", big_buffer);
3218 Ustrcpy(big_buffer, "...");
3221 printing = string_printing(argv[i]);
3222 if (printing[0] == 0) quote = US"\""; else
3224 uschar *pp = printing;
3226 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3228 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3229 (p - big_buffer) - 4), printing, quote);
3232 log_write(0, LOG_MAIN, "%s", big_buffer);
3235 /* Set the working directory to be the top-level spool directory. We don't rely
3236 on this in the code, which always uses fully qualified names, but it's useful
3237 for core dumps etc. Don't complain if it fails - the spool directory might not
3238 be generally accessible and calls with the -C option (and others) have lost
3239 privilege by now. */
3241 if (Uchdir(spool_directory) != 0)
3243 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3244 (void)Uchdir(spool_directory);
3247 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3248 alias file. Exim doesn't have such a concept, but this call is screwed into
3249 Sun's YP makefiles. Handle this by calling a configured script, as the real
3250 user who called Exim. The -oA option can be used to pass an argument to the
3255 fclose(config_file);
3256 if (bi_command != NULL)
3260 argv[i++] = bi_command;
3261 if (alias_arg != NULL) argv[i++] = alias_arg;
3264 setgroups(group_count, group_list);
3265 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3267 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3268 (argv[1] == NULL)? US"" : argv[1]);
3270 execv(CS argv[0], (char *const *)argv);
3271 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3276 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3281 /* If an action on specific messages is requested, or if a daemon or queue
3282 runner is being started, we need to know if Exim was called by an admin user.
3283 This is the case if the real user is root or exim, or if the real group is
3284 exim, or if one of the supplementary groups is exim or a group listed in
3285 admin_groups. We don't fail all message actions immediately if not admin_user,
3286 since some actions can be performed by non-admin users. Instead, set admin_user
3287 for later interrogation. */
3289 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3295 for (i = 0; i < group_count; i++)
3297 if (group_list[i] == exim_gid) admin_user = TRUE;
3298 else if (admin_groups != NULL)
3300 for (j = 1; j <= (int)(admin_groups[0]); j++)
3301 if (admin_groups[j] == group_list[i])
3302 { admin_user = TRUE; break; }
3304 if (admin_user) break;
3308 /* Another group of privileged users are the trusted users. These are root,
3309 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3310 are permitted to specify sender_addresses with -f on the command line, and
3311 other message parameters as well. */
3313 if (real_uid == root_uid || real_uid == exim_uid)
3314 trusted_caller = TRUE;
3319 if (trusted_users != NULL)
3321 for (i = 1; i <= (int)(trusted_users[0]); i++)
3322 if (trusted_users[i] == real_uid)
3323 { trusted_caller = TRUE; break; }
3326 if (!trusted_caller && trusted_groups != NULL)
3328 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3330 if (trusted_groups[i] == real_gid)
3331 trusted_caller = TRUE;
3332 else for (j = 0; j < group_count; j++)
3334 if (trusted_groups[i] == group_list[j])
3335 { trusted_caller = TRUE; break; }
3337 if (trusted_caller) break;
3342 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3343 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3345 /* Only an admin user may start the daemon or force a queue run in the default
3346 configuration, but the queue run restriction can be relaxed. Only an admin
3347 user may request that a message be returned to its sender forthwith. Only an
3348 admin user may specify a debug level greater than D_v (because it might show
3349 passwords, etc. in lookup queries). Only an admin user may request a queue
3354 BOOL debugset = (debug_selector & ~D_v) != 0;
3355 if (deliver_give_up || daemon_listen ||
3356 (count_queue && queue_list_requires_admin) ||
3357 (list_queue && queue_list_requires_admin) ||
3358 (queue_interval >= 0 && prod_requires_admin) ||
3359 (debugset && !running_in_test_harness))
3361 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3366 /* If the real user is not root or the exim uid, the argument for passing
3367 in an open TCP/IP connection for another message is not permitted, nor is
3368 running with the -N option for any delivery action, unless this call to exim is
3369 one that supplied an input message, or we are using a patched exim for
3370 regression testing. */
3372 if (real_uid != root_uid && real_uid != exim_uid &&
3373 (continue_hostname != NULL ||
3375 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3376 )) && !running_in_test_harness)
3378 fprintf(stderr, "exim: Permission denied\n");
3379 return EXIT_FAILURE;
3382 /* If the caller is not trusted, certain arguments are ignored when running for
3383 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf). Note
3384 that authority for performing certain actions on messages is tested in the
3385 queue_action() function. */
3387 if (!trusted_caller && !checking && filter_test == NULL)
3389 sender_host_name = sender_host_address = interface_address =
3390 sender_ident = received_protocol = NULL;
3391 sender_host_port = interface_port = 0;
3392 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3395 /* If a sender host address is set, extract the optional port number off the
3396 end of it and check its syntax. Do the same thing for the interface address.
3397 Exim exits if the syntax is bad. */
3401 if (sender_host_address != NULL)
3402 sender_host_port = check_port(sender_host_address);
3403 if (interface_address != NULL)
3404 interface_port = check_port(interface_address);
3407 /* If an SMTP message is being received check to see if the standard input is a
3408 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3409 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3414 union sockaddr_46 inetd_sock;
3415 SOCKLEN_T size = sizeof(inetd_sock);
3416 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3418 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3419 if (family == AF_INET || family == AF_INET6)
3421 union sockaddr_46 interface_sock;
3422 size = sizeof(interface_sock);
3424 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3425 interface_address = host_ntoa(-1, &interface_sock, NULL,
3428 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3430 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3433 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3434 NULL, &sender_host_port);
3435 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3436 "inetd is not supported when mua_wrapper is set");
3441 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3442 return EXIT_FAILURE;
3448 /* If the load average is going to be needed while receiving a message, get it
3449 now for those OS that require the first call to os_getloadavg() to be done as
3450 root. There will be further calls later for each message received. */
3452 #ifdef LOAD_AVG_NEEDS_ROOT
3453 if (receiving_message &&
3454 (queue_only_load >= 0 ||
3455 (is_inetd && smtp_load_reserve >= 0)
3458 load_average = os_getloadavg();
3462 /* The queue_only configuration option can be overridden by -odx on the command
3463 line, except that if queue_only_override is false, queue_only cannot be unset
3464 from the command line. */
3466 if (queue_only_set && (queue_only_override || arg_queue_only))
3467 queue_only = arg_queue_only;
3469 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3472 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3473 if (arg_smtp_receive_timeout >= 0)
3474 smtp_receive_timeout = arg_smtp_receive_timeout;
3476 /* If Exim was started with root privilege, unless we have already removed the
3477 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3478 except when starting the daemon or doing some kind of delivery or address
3479 testing (-bt). These are the only cases when root need to be retained. We run
3480 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3481 retained only for starting the daemon. */
3483 if (!unprivileged && /* originally had root AND */
3484 !removed_privilege && /* still got root AND */
3485 !daemon_listen && /* not starting the daemon */
3486 queue_interval <= 0 && /* (either kind of daemon) */
3488 deliver_drop_privilege || /* requested unprivileged */
3490 queue_interval < 0 && /* not running the queue */
3491 (msg_action_arg < 0 || /* and */
3492 msg_action != MSG_DELIVER) && /* not delivering and */
3493 (!checking || !address_test_mode) /* not address checking */
3497 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3500 /* When we are retaining a privileged uid, we still change to the exim gid. */
3502 else setgid(exim_gid);
3504 /* Handle a request to list the delivery queue */
3508 set_process_info("listing the queue");
3509 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3513 /* Handle a request to count the delivery queue */
3517 set_process_info("counting the queue");
3522 /* Handle actions on specific messages, except for the force delivery action,
3523 which is done below. Some actions take a whole list of message ids, which
3524 are known to continue up to the end of the arguments. Others take a single
3525 message id and then operate on the recipients list. */
3527 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3529 int yield = EXIT_SUCCESS;
3530 set_process_info("acting on specified messages");
3532 if (!one_msg_action)
3534 for (i = msg_action_arg; i < argc; i++)
3535 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3536 yield = EXIT_FAILURE;
3539 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3540 recipients_arg)) yield = EXIT_FAILURE;
3544 /* All the modes below here require the remaining configuration sections
3545 to be read, except that we can skip over the ACL setting when delivering
3546 specific messages, or doing a queue run. (For various testing cases we could
3547 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3550 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3552 /* The configuration data will have been read into POOL_PERM because we won't
3553 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3554 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3555 configuration were read into POOL_MAIN, because we don't do any resets till
3556 later on. However, it seems right, and it does ensure that both pools get used.
3559 store_pool = POOL_MAIN;
3561 /* Handle the -brt option. This is for checking out retry configurations.
3562 The next three arguments are a domain name or a complete address, and
3563 optionally two error numbers. All it does is to call the function that
3564 scans the retry configuration data. */
3566 if (test_retry_arg >= 0)
3568 retry_config *yield;
3569 int basic_errno = 0;
3573 if (test_retry_arg >= argc)
3575 printf("-brt needs a domain or address argument\n");
3576 exim_exit(EXIT_FAILURE);
3578 s1 = argv[test_retry_arg++];
3581 /* If the first argument contains no @ and no . it might be a local user
3582 or it might be a single-component name. Treat as a domain. */
3584 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3586 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3587 "being \ntreated as a one-component domain, not as a local part.\n\n",
3591 /* There may be an optional second domain arg. */
3593 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3594 s2 = argv[test_retry_arg++];
3596 /* The final arg is an error name */
3598 if (test_retry_arg < argc)
3600 uschar *ss = argv[test_retry_arg];
3602 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3605 printf("%s\n", CS error);
3606 return EXIT_FAILURE;
3609 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3610 an error is for matching codes to the decade. Turn them into a real error
3611 code, off the decade. */
3613 if (basic_errno == ERRNO_RCPT4XX)
3615 int code = (more_errno >> 8) & 255;
3617 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3618 else if (code > 100)
3619 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3623 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3624 if (yield == NULL) printf("No retry information found\n"); else
3627 more_errno = yield->more_errno;
3628 printf("Retry rule: %s ", yield->pattern);
3630 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3632 printf("quota%s%s ",
3633 (more_errno > 0)? "_" : "",
3634 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3636 else if (yield->basic_errno == ECONNREFUSED)
3638 printf("refused%s%s ",
3639 (more_errno > 0)? "_" : "",
3640 (more_errno == 'M')? "MX" :
3641 (more_errno == 'A')? "A" : "");
3643 else if (yield->basic_errno == ETIMEDOUT)
3646 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3648 if (more_errno != 0) printf("_%s",
3649 (more_errno == 'M')? "MX" : "A");
3652 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3653 printf("auth_failed ");
3656 for (r = yield->rules; r != NULL; r = r->next)
3658 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3659 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3665 printf(",%d.", x/1000);
3679 exim_exit(EXIT_SUCCESS);
3682 /* Handle a request to list one or more configuration options */
3686 set_process_info("listing variables");
3687 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3688 else for (i = recipients_arg; i < argc; i++)
3691 (Ustrcmp(argv[i], "router") == 0 ||
3692 Ustrcmp(argv[i], "transport") == 0 ||
3693 Ustrcmp(argv[i], "authenticator") == 0))
3695 readconf_print(argv[i+1], argv[i]);
3698 else readconf_print(argv[i], NULL);
3700 exim_exit(EXIT_SUCCESS);
3704 /* Handle a request to deliver one or more messages that are already on the
3705 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3706 is typically used for a small number when prodding by hand (when the option
3707 forced_delivery will be set) or when re-execing to regain root privilege.
3708 Each message delivery must happen in a separate process, so we fork a process
3709 for each one, and run them sequentially so that debugging output doesn't get
3710 intertwined, and to avoid spawning too many processes if a long list is given.
3711 However, don't fork for the last one; this saves a process in the common case
3712 when Exim is called to deliver just one message. */
3714 if (msg_action_arg > 0)
3716 if (prod_requires_admin && !admin_user)
3718 fprintf(stderr, "exim: Permission denied\n");
3719 exim_exit(EXIT_FAILURE);
3721 set_process_info("delivering specified messages");
3722 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3723 for (i = msg_action_arg; i < argc; i++)
3728 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3729 else if ((pid = fork()) == 0)
3731 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3732 _exit(EXIT_SUCCESS);
3736 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3738 exim_exit(EXIT_FAILURE);
3742 exim_exit(EXIT_SUCCESS);
3746 /* If only a single queue run is requested, without SMTP listening, we can just
3747 turn into a queue runner, with an optional starting message id. */
3749 if (queue_interval == 0 && !daemon_listen)
3751 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3752 (start_queue_run_id == NULL)? US"" : US" starting at ",
3753 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3754 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3755 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3756 set_process_info("running the queue (single queue run)");
3757 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3758 exim_exit(EXIT_SUCCESS);
3762 /* Find the login name of the real user running this process. This is always
3763 needed when receiving a message, because it is written into the spool file. It
3764 may also be used to construct a from: or a sender: header, and in this case we
3765 need the user's full name as well, so save a copy of it, checked for RFC822
3766 syntax and munged if necessary, if it hasn't previously been set by the -F
3767 argument. We may try to get the passwd entry more than once, in case NIS or
3768 other delays are in evidence. Save the home directory for use in filter testing
3773 if ((pw = getpwuid(real_uid)) != NULL)
3775 originator_login = string_copy(US pw->pw_name);
3776 originator_home = string_copy(US pw->pw_dir);
3778 /* If user name has not been set by -F, set it from the passwd entry
3779 unless -f has been used to set the sender address by a trusted user. */
3781 if (originator_name == NULL)
3783 if (sender_address == NULL ||
3784 (!trusted_caller && filter_test == NULL))
3786 uschar *name = US pw->pw_gecos;
3787 uschar *amp = Ustrchr(name, '&');
3790 /* Most Unix specify that a '&' character in the gecos field is
3791 replaced by a copy of the login name, and some even specify that
3792 the first character should be upper cased, so that's what we do. */
3797 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3798 amp - name, name, &loffset, originator_login, amp + 1);
3799 buffer[loffset] = toupper(buffer[loffset]);
3803 /* If a pattern for matching the gecos field was supplied, apply
3804 it and then expand the name string. */
3806 if (gecos_pattern != NULL && gecos_name != NULL)
3809 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3811 if (regex_match_and_setup(re, name, 0, -1))
3813 uschar *new_name = expand_string(gecos_name);
3815 if (new_name != NULL)
3817 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3818 "gecos field \"%s\"\n", new_name, name);
3821 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3822 "\"%s\": %s\n", gecos_name, expand_string_message);
3824 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3825 "gecos field \"%s\"\n", gecos_pattern, name);
3826 store_free((void *)re);
3828 originator_name = string_copy(name);
3831 /* A trusted caller has used -f but not -F */
3833 else originator_name = US"";
3836 /* Break the retry loop */
3841 if (++i > finduser_retries) break;
3845 /* If we cannot get a user login, log the incident and give up, unless the
3846 configuration specifies something to use. When running in the test harness,
3847 any setting of unknown_login overrides the actual login name. */
3849 if (originator_login == NULL || running_in_test_harness)
3851 if (unknown_login != NULL)
3853 originator_login = expand_string(unknown_login);
3854 if (originator_name == NULL && unknown_username != NULL)
3855 originator_name = expand_string(unknown_username);
3856 if (originator_name == NULL) originator_name = US"";
3858 if (originator_login == NULL)
3859 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3863 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3866 originator_name = string_copy(parse_fix_phrase(originator_name,
3867 Ustrlen(originator_name), big_buffer, big_buffer_size));
3869 /* If a message is created by this call of Exim, the uid/gid of its originator
3870 are those of the caller. These values are overridden if an existing message is
3871 read in from the spool. */
3873 originator_uid = real_uid;
3874 originator_gid = real_gid;
3876 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3877 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3879 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3880 returns. We leave this till here so that the originator_ fields are available
3881 for incoming messages via the daemon. */
3883 if (daemon_listen || queue_interval > 0)
3885 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3886 "run when mua_wrapper is set");
3890 /* If the sender ident has not been set (by a trusted caller) set it to
3891 the caller. This will get overwritten below for an inetd call. If a trusted
3892 caller has set it empty, unset it. */
3894 if (sender_ident == NULL) sender_ident = originator_login;
3895 else if (sender_ident[0] == 0) sender_ident = NULL;
3897 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3898 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3899 originator_* variables set. */
3901 if (test_rewrite_arg >= 0)
3903 really_exim = FALSE;
3904 if (test_rewrite_arg >= argc)
3906 printf("-brw needs an address argument\n");
3907 exim_exit(EXIT_FAILURE);
3909 rewrite_test(argv[test_rewrite_arg]);
3910 exim_exit(EXIT_SUCCESS);
3913 /* A locally-supplied message is considered to be coming from a local user
3914 unless a trusted caller supplies a sender address with -f, or is passing in the
3915 message via SMTP (inetd invocation or otherwise). */
3917 if ((sender_address == NULL && !smtp_input) ||
3918 (!trusted_caller && filter_test == NULL))
3920 sender_local = TRUE;
3922 /* A trusted caller can supply authenticated_sender and authenticated_id
3923 via -oMas and -oMai and if so, they will already be set. */
3925 if (authenticated_sender == NULL)
3926 authenticated_sender = string_sprintf("%s@%s", originator_login,
3927 qualify_domain_sender);
3928 if (authenticated_id == NULL) authenticated_id = originator_login;
3931 /* Trusted callers are always permitted to specify the sender address.
3932 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3933 is specified is the empty address. However, if a trusted caller does not
3934 specify a sender address for SMTP input, we leave sender_address unset. This
3935 causes the MAIL commands to be honoured. */
3937 if ((!smtp_input && sender_address == NULL) ||
3938 !receive_check_set_sender(sender_address))
3940 /* Either the caller is not permitted to set a general sender, or this is
3941 non-SMTP input and the trusted caller has not set a sender. If there is no
3942 sender, or if a sender other than <> is set, override with the originator's
3943 login (which will get qualified below), except when checking things. */
3945 if (sender_address == NULL /* No sender_address set */
3947 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3948 !checking && /* Not running tests, AND */
3949 filter_test == NULL)) /* Not testing a filter */
3951 sender_address = originator_login;
3952 sender_address_forced = FALSE;
3953 sender_address_domain = 0;
3957 /* Remember whether an untrusted caller set the sender address */
3959 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3961 /* Ensure that the sender address is fully qualified unless it is the empty
3962 address, which indicates an error message, or doesn't exist (root caller, smtp
3963 interface, no -f argument). */
3965 if (sender_address != NULL && sender_address[0] != 0 &&
3966 sender_address_domain == 0)
3967 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
3968 qualify_domain_sender);
3970 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
3972 /* Handle a request to verify a list of addresses, or test them for delivery.
3973 This must follow the setting of the sender address, since routers can be
3974 predicated upon the sender. If no arguments are given, read addresses from
3975 stdin. Set debug_level to at least D_v to get full output for address testing.
3978 if (verify_address_mode || address_test_mode)
3981 int flags = vopt_qualify;
3983 if (verify_address_mode)
3985 if (!verify_as_sender) flags |= vopt_is_recipient;
3986 DEBUG(D_verify) debug_print_ids(US"Verifying:");
3991 flags |= vopt_is_recipient;
3992 debug_selector |= D_v;
3993 debug_file = stderr;
3994 debug_fd = fileno(debug_file);
3995 DEBUG(D_verify) debug_print_ids(US"Address testing:");
3998 if (recipients_arg < argc)
4000 while (recipients_arg < argc)
4002 uschar *s = argv[recipients_arg++];
4005 BOOL finished = FALSE;
4006 uschar *ss = parse_find_address_end(s, FALSE);
4007 if (*ss == ',') *ss = 0; else finished = TRUE;
4008 test_address(s, flags, &exit_value);
4011 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4018 uschar *s = get_stdinput(NULL, NULL);
4019 if (s == NULL) break;
4020 test_address(s, flags, &exit_value);
4024 exim_exit(exit_value);
4027 /* Handle expansion checking */
4031 if (recipients_arg < argc)
4033 while (recipients_arg < argc)
4035 uschar *s = argv[recipients_arg++];
4036 uschar *ss = expand_string(s);
4038 printf ("Failed: %s\n", expand_string_message);
4039 else printf("%s\n", CS ss);
4047 char *(*fn_readline)(char *) = NULL;
4048 char *(*fn_addhist)(char *) = NULL;
4051 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4057 uschar *source = get_stdinput(fn_readline, fn_addhist);
4058 if (source == NULL) break;
4059 ss = expand_string(source);
4061 printf ("Failed: %s\n", expand_string_message);
4062 else printf("%s\n", CS ss);
4066 if (dlhandle != NULL) dlclose(dlhandle);
4070 exim_exit(EXIT_SUCCESS);
4074 /* The active host name is normally the primary host name, but it can be varied
4075 for hosts that want to play several parts at once. We need to ensure that it is
4076 set for host checking, and for receiving messages. */
4078 smtp_active_hostname = primary_hostname;
4079 if (raw_active_hostname != NULL)
4081 uschar *nah = expand_string(raw_active_hostname);
4084 if (!expand_string_forcedfail)
4085 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4086 "(smtp_active_hostname): %s", raw_active_hostname,
4087 expand_string_message);
4089 else if (nah[0] != 0) smtp_active_hostname = nah;
4092 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4093 given IP address so that the blocking and relay configuration can be tested. An
4094 RFC 1413 call is made only if we are running in the test harness and an
4095 incoming interface and both ports are specified, because there is no TCP/IP
4096 call to find the ident for. */
4103 sender_ident = NULL;
4104 if (running_in_test_harness && sender_host_port != 0 &&
4105 interface_address != NULL && interface_port != 0)
4106 verify_get_ident(1413);
4108 /* In case the given address is a non-canonical IPv6 address, canonicize
4109 it. The code works for both IPv4 and IPv6, as it happens. */
4111 size = host_aton(sender_host_address, x);
4112 sender_host_address = store_get(48); /* large enough for full IPv6 */
4113 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4115 /* Now set up for testing */
4117 host_build_sender_fullhost();
4121 sender_local = FALSE;
4122 sender_host_notsocket = TRUE;
4123 debug_file = stderr;
4124 debug_fd = fileno(debug_file);
4125 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4126 "**** but without any ident (RFC 1413) callback.\n"
4127 "**** This is not for real!\n\n",
4128 sender_host_address);
4130 if (verify_check_host(&hosts_connection_nolog) == OK)
4131 log_write_selector &= ~L_smtp_connection;
4132 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4134 if (smtp_start_session())
4136 reset_point = store_get(0);
4139 store_reset(reset_point);
4140 if (smtp_setup_msg() <= 0) break;
4141 if (!receive_msg(FALSE)) break;
4144 exim_exit(EXIT_SUCCESS);
4148 /* Arrange for message reception if recipients or SMTP were specified;
4149 otherwise complain unless a version print (-bV) happened or this is a filter
4150 verification test. In the former case, show the configuration file name. */
4152 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4154 if (version_printed)
4156 printf("Configuration file is %s\n", config_main_filename);
4157 return EXIT_SUCCESS;
4159 if (filter_test == NULL)
4162 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4163 "not directly from a shell command line. Options and/or arguments control\n"
4164 "what it does when called. For a list of options, see the Exim documentation.\n");
4165 return EXIT_FAILURE;
4170 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4171 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4172 that we are not called from inetd, because that is rejected above. The
4173 following configuration settings are forced here:
4175 (1) Synchronous delivery (-odi)
4176 (2) Errors to stderr (-oep == -oeq)
4177 (3) No parallel remote delivery
4178 (4) Unprivileged delivery
4180 We don't force overall queueing options because there are several of them;
4181 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4182 to override any SMTP queueing. */
4186 synchronous_delivery = TRUE;
4187 arg_error_handling = ERRORS_STDERR;
4188 remote_max_parallel = 1;
4189 deliver_drop_privilege = TRUE;
4191 queue_smtp_domains = NULL;
4195 /* Prepare to accept one or more new messages on the standard input. When a
4196 message has been read, its id is returned in message_id[]. If doing immediate
4197 delivery, we fork a delivery process for each received message, except for the
4198 last one, where we can save a process switch.
4200 It is only in non-smtp mode that error_handling is allowed to be changed from
4201 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4202 sendmail error modes other than -oem ever actually used? Later: yes.) */
4204 if (!smtp_input) error_handling = arg_error_handling;
4206 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4207 logging being sent down the socket and make an identd call to get the
4213 exim_nullstd(); /* Re-open to /dev/null */
4214 verify_get_ident(IDENT_PORT);
4215 host_build_sender_fullhost();
4216 set_process_info("handling incoming connection from %s via inetd",
4220 /* If the sender host address has been set, build sender_fullhost if it hasn't
4221 already been done (which it will have been for inetd). This caters for the
4222 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4223 so that the test for IP options is skipped for -bs input. */
4225 if (sender_host_address != NULL && sender_fullhost == NULL)
4227 host_build_sender_fullhost();
4228 set_process_info("handling incoming connection from %s via -oMa",
4230 sender_host_notsocket = TRUE;
4233 /* Otherwise, set the sender host as unknown except for inetd calls. This
4234 prevents host checking in the case of -bs not from inetd and also for -bS. */
4236 else if (!is_inetd) sender_host_unknown = TRUE;
4238 /* If stdout does not exist, then dup stdin to stdout. This can happen
4239 if exim is started from inetd. In this case fd 0 will be set to the socket,
4240 but fd 1 will not be set. This also happens for passed SMTP channels. */
4242 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4244 /* Set up the incoming protocol name and the state of the program. Root
4245 is allowed to force received protocol via the -oMr option above, and if we are
4246 in a non-local SMTP state it means we have come via inetd and the process info
4247 has already been set up. We don't set received_protocol here for smtp input,
4248 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4252 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4257 if (received_protocol == NULL)
4258 received_protocol = string_sprintf("local%s", called_as);
4259 set_process_info("accepting a local non-SMTP message from <%s>",
4263 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4267 local_queue_only = queue_only;
4269 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4270 the spool if so configured. On failure, we must not attempt to send an error
4271 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4272 error code is given.) */
4274 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4276 fprintf(stderr, "exim: insufficient disk space\n");
4277 return EXIT_FAILURE;
4280 /* If this is smtp input of any kind, handle the start of the SMTP
4287 if (verify_check_host(&hosts_connection_nolog) == OK)
4288 log_write_selector &= ~L_smtp_connection;
4289 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4290 if (!smtp_start_session())
4293 exim_exit(EXIT_SUCCESS);
4297 /* Otherwise, set up the input size limit here */
4301 thismessage_size_limit = expand_string_integer(message_size_limit);
4302 if (thismessage_size_limit < 0)
4304 if (thismessage_size_limit == -1)
4305 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4306 "message_size_limit: %s", expand_string_message);
4308 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4309 "message_size_limit: %s", expand_string_message);
4313 /* Loop for several messages when reading SMTP input. If we fork any child
4314 processes, we don't want to wait for them unless synchronous delivery is
4315 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4316 same as SIG_DFL, despite the fact that documentation often lists the default as
4317 "ignore". This is a confusing area. This is what I know:
4319 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4320 processes that complete simply to go away without ever becoming defunct. You
4321 can't then wait for them - but we don't want to wait for them in the
4322 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4323 happen for all OS (e.g. *BSD is different).
4325 But that's not the end of the story. Some (many? all?) systems have the
4326 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4327 has by default, so it seems that the difference is merely one of default
4328 (compare restarting vs non-restarting signals).
4330 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4331 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4332 of the loop below. Paranoia rules.
4334 February 2003: That's *still* not the end of the story. There are now versions
4335 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4336 process then calls waitpid(), a grumble is written to the system log, because
4337 this is logically inconsistent. In other words, it doesn't like the paranoia.
4338 As a consequenc of this, the waitpid() below is now excluded if we are sure
4339 that SIG_IGN works. */
4341 if (!synchronous_delivery)
4344 struct sigaction act;
4345 act.sa_handler = SIG_IGN;
4346 sigemptyset(&(act.sa_mask));
4347 act.sa_flags = SA_NOCLDWAIT;
4348 sigaction(SIGCHLD, &act, NULL);
4350 signal(SIGCHLD, SIG_IGN);
4354 /* Save the current store pool point, for resetting at the start of
4355 each message, and save the real sender address, if any. */
4357 reset_point = store_get(0);
4358 real_sender_address = sender_address;
4360 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4361 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4366 store_reset(reset_point);
4369 /* In the SMTP case, we have to handle the initial SMTP input and build the
4370 recipients list, before calling receive_msg() to read the message proper.
4371 Whatever sender address is actually given in the SMTP transaction is
4372 actually ignored for local senders - we use the actual sender, which is
4373 normally either the underlying user running this process or a -f argument
4374 provided by a trusted caller. It is saved in real_sender_address.
4376 However, if this value is NULL, we are dealing with a trusted caller when
4377 -f was not used; in this case, the SMTP sender is allowed to stand.
4379 Also, if untrusted_set_sender is set, we permit sender addresses that match
4380 anything in its list.
4382 The variable raw_sender_address holds the sender address before rewriting. */
4387 if ((rc = smtp_setup_msg()) > 0)
4389 if (real_sender_address != NULL &&
4390 !receive_check_set_sender(sender_address))
4392 sender_address = raw_sender = real_sender_address;
4393 sender_address_unrewritten = NULL;
4395 more = receive_msg(extract_recipients);
4396 if (message_id[0] == 0)
4399 exim_exit(EXIT_FAILURE);
4402 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4405 /* In the non-SMTP case, we have all the information from the command
4406 line, but must process it in case it is in the more general RFC822
4407 format, and in any case, to detect syntax errors. Also, it appears that
4408 the use of comma-separated lists as single arguments is common, so we
4409 had better support them. */
4415 int count = argc - recipients_arg;
4416 uschar **list = argv + recipients_arg;
4418 /* These options cannot be changed dynamically for non-SMTP messages */
4420 active_local_sender_retain = local_sender_retain;
4421 active_local_from_check = local_from_check;
4423 /* Save before any rewriting */
4425 raw_sender = string_copy(sender_address);
4427 /* Loop for each argument */
4429 for (i = 0; i < count; i++)
4431 int start, end, domain;
4433 uschar *s = list[i];
4435 /* Loop for each comma-separated address */
4439 BOOL finished = FALSE;
4441 uschar *ss = parse_find_address_end(s, FALSE);
4443 if (*ss == ',') *ss = 0; else finished = TRUE;
4445 /* Check max recipients - if -t was used, these aren't recipients */
4447 if (recipients_max > 0 && ++rcount > recipients_max &&
4448 !extract_recipients)
4450 if (error_handling == ERRORS_STDERR)
4452 fprintf(stderr, "exim: too many recipients\n");
4453 exim_exit(EXIT_FAILURE);
4458 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4459 errors_sender_rc : EXIT_FAILURE;
4464 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4466 if (domain == 0 && !allow_unqualified_recipient)
4469 errmess = US"unqualified recipient address not allowed";
4472 if (recipient == NULL)
4474 if (error_handling == ERRORS_STDERR)
4476 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4477 string_printing(list[i]), errmess);
4478 exim_exit(EXIT_FAILURE);
4484 eblock.text1 = string_printing(list[i]);
4485 eblock.text2 = errmess;
4487 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4488 errors_sender_rc : EXIT_FAILURE;
4492 receive_add_recipient(recipient, -1);
4495 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4499 /* Show the recipients when debugging */
4504 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4505 if (recipients_list != NULL)
4507 debug_printf("Recipients:\n");
4508 for (i = 0; i < recipients_count; i++)
4509 debug_printf(" %s\n", recipients_list[i].address);
4513 /* Read the data for the message. If filter_test is true, this will
4514 just read the headers for the message, and not write anything onto
4517 message_ended = END_NOTENDED;
4518 more = receive_msg(extract_recipients);
4520 /* more is always FALSE here (not SMTP message) when reading a message
4521 for real; when reading the headers of a message for filter testing,
4522 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4524 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4525 } /* Non-SMTP message reception */
4527 /* If this is a filter testing run, there are headers in store, but
4528 no message on the spool. Run the filtering code in testing mode, setting
4529 the domain to the qualify domain and the local part to the current user,
4530 unless they have been set by options. The prefix and suffix are left unset
4531 unless specified. The the return path is set to to the sender unless it has
4532 already been set from a return-path header in the message. */
4534 if (filter_test != NULL)
4536 deliver_domain = (ftest_domain != NULL)?
4537 ftest_domain : qualify_domain_recipient;
4538 deliver_domain_orig = deliver_domain;
4539 deliver_localpart = (ftest_localpart != NULL)?
4540 ftest_localpart : originator_login;
4541 deliver_localpart_orig = deliver_localpart;
4542 deliver_localpart_prefix = ftest_prefix;
4543 deliver_localpart_suffix = ftest_suffix;
4544 deliver_home = originator_home;
4546 if (return_path == NULL)
4548 printf("Return-path copied from sender\n");
4549 return_path = string_copy(sender_address);
4553 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4555 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4557 receive_add_recipient(
4558 string_sprintf("%s%s%s@%s",
4559 (ftest_prefix == NULL)? US"" : ftest_prefix,
4561 (ftest_suffix == NULL)? US"" : ftest_suffix,
4562 deliver_domain), -1);
4564 printf("Recipient = %s\n", recipients_list[0].address);
4565 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4566 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4568 chdir("/"); /* Get away from wherever the user is running this from */
4569 exim_exit(filter_runtest(filter_fd, ftest_system, more)?
4570 EXIT_SUCCESS : EXIT_FAILURE);
4573 /* Else act on the result of message reception. We should not get here unless
4574 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4575 TRUE. If it is not, check on the number of messages received in this
4576 connection. If that's OK and queue_only_load is set, check that the load
4577 average is below it. If it is not, set local_queue_only TRUE. Note that it
4578 then remains this way for any subsequent messages on the same SMTP connection.
4579 This is a deliberate choice; even though the load average may fall, it
4580 doesn't seem right to deliver later messages on the same call when not
4581 delivering earlier ones. */
4583 if (!local_queue_only)
4585 if (smtp_accept_queue_per_connection > 0 &&
4586 receive_messagecount > smtp_accept_queue_per_connection)
4588 local_queue_only = TRUE;
4589 queue_only_reason = 2;
4591 else if (queue_only_load >= 0)
4593 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4594 if (local_queue_only) queue_only_reason = 3;
4598 /* If running as an MUA wrapper, all queueing options and freezing options
4602 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4604 /* Log the queueing here, when it will get a message id attached, but
4605 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4608 if (local_queue_only) switch(queue_only_reason)
4611 log_write(L_delay_delivery,
4612 LOG_MAIN, "no immediate delivery: more than %d messages "
4613 "received in one connection", smtp_accept_queue_per_connection);
4617 log_write(L_delay_delivery,
4618 LOG_MAIN, "no immediate delivery: load average %.2f",
4619 (double)load_average/1000.0);
4623 /* Else do the delivery unless the ACL or local_scan() called for queue only
4624 or froze the message. Always deliver in a separate process. A fork failure is
4625 not a disaster, as the delivery will eventually happen on a subsequent queue
4626 run. The search cache must be tidied before the fork, as the parent will
4627 do it before exiting. The child will trigger a lookup failure and
4628 thereby defer the delivery if it tries to use (for example) a cached ldap
4629 connection that the parent has called unbind on. */
4631 else if (!queue_only_policy && !deliver_freeze)
4636 if ((pid = fork()) == 0)
4639 close_unwanted(); /* Close unwanted file descriptors and TLS */
4640 exim_nullstd(); /* Ensure std{in,out,err} exist */
4642 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4643 mode, deliver_drop_privilege is forced TRUE). */
4645 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4647 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4649 /* Control does not return here. */
4652 /* No need to re-exec */
4654 rc = deliver_message(message_id, FALSE, FALSE);
4656 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4657 EXIT_SUCCESS : EXIT_FAILURE);
4662 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4663 "process: %s", strerror(errno));
4666 /* In the parent, wait if synchronous delivery is required. This will
4667 always be the case in MUA wrapper mode. */
4669 else if (synchronous_delivery)
4672 while (wait(&status) != pid);
4673 if ((status & 0x00ff) != 0)
4674 log_write(0, LOG_MAIN|LOG_PANIC,
4675 "process %d crashed with signal %d while delivering %s",
4676 (int)pid, status & 0x00ff, message_id);
4677 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4681 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4682 automatically reaps children (see comments above the loop), clear away any
4683 finished subprocesses here, in case there are lots of messages coming in
4684 from the same source. */
4686 #ifndef SIG_IGN_WORKS
4687 while (waitpid(-1, NULL, WNOHANG) > 0);
4691 exim_exit(EXIT_SUCCESS); /* Never returns */
4692 return 0; /* To stop compiler warning */