1 /* $Cambridge: exim/src/src/exim.c,v 1.9.2.3 2004/12/10 14:59:08 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");
845 #ifdef WITH_OLD_DEMIME
846 fprintf(f, " Old_Demime");
848 #ifdef EXPERIMENTAL_SPF
849 fprintf(f, " Experimental_SPF");
851 #ifdef EXPERIMENTAL_SRS
852 fprintf(f, " Experimental_SRS");
854 #ifdef EXPERIMENTAL_BRIGHTMAIL
855 fprintf(f, " Experimental_Brightmail");
859 fprintf(f, "Lookups:");
860 #ifdef LOOKUP_LSEARCH
861 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
867 fprintf(f, " dbm dbmnz");
870 fprintf(f, " dnsdb");
872 #ifdef LOOKUP_DSEARCH
873 fprintf(f, " dsearch");
876 fprintf(f, " ibase");
879 fprintf(f, " ldap ldapdn ldapm");
882 fprintf(f, " mysql");
885 fprintf(f, " nis nis0");
887 #ifdef LOOKUP_NISPLUS
888 fprintf(f, " nisplus");
891 fprintf(f, " oracle");
894 fprintf(f, " passwd");
897 fprintf(f, " pgsql");
900 fprintf(f, " testdb");
903 fprintf(f, " whoson");
907 fprintf(f, "Authenticators:");
909 fprintf(f, " cram_md5");
911 #ifdef AUTH_CYRUS_SASL
912 fprintf(f, " cyrus_sasl");
914 #ifdef AUTH_PLAINTEXT
915 fprintf(f, " plaintext");
922 fprintf(f, "Routers:");
924 fprintf(f, " accept");
926 #ifdef ROUTER_DNSLOOKUP
927 fprintf(f, " dnslookup");
929 #ifdef ROUTER_IPLITERAL
930 fprintf(f, " ipliteral");
932 #ifdef ROUTER_IPLOOKUP
933 fprintf(f, " iplookup");
935 #ifdef ROUTER_MANUALROUTE
936 fprintf(f, " manualroute");
938 #ifdef ROUTER_QUERYPROGRAM
939 fprintf(f, " queryprogram");
941 #ifdef ROUTER_REDIRECT
942 fprintf(f, " redirect");
946 fprintf(f, "Transports:");
947 #ifdef TRANSPORT_APPENDFILE
948 fprintf(f, " appendfile");
949 #ifdef SUPPORT_MAILDIR
950 fprintf(f, "/maildir");
952 #ifdef SUPPORT_MAILSTORE
953 fprintf(f, "/mailstore");
959 #ifdef TRANSPORT_AUTOREPLY
960 fprintf(f, " autoreply");
962 #ifdef TRANSPORT_LMTP
965 #ifdef TRANSPORT_PIPE
968 #ifdef TRANSPORT_SMTP
973 if (fixed_never_users[0] > 0)
976 fprintf(f, "Fixed never_users: ");
977 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
978 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
979 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
986 /*************************************************
987 * Quote a local part *
988 *************************************************/
990 /* This function is used when a sender address or a From: or Sender: header
991 line is being created from the caller's login, or from an authenticated_id. It
992 applies appropriate quoting rules for a local part.
994 Argument: the local part
995 Returns: the local part, quoted if necessary
999 local_part_quote(uschar *lpart)
1001 BOOL needs_quote = FALSE;
1006 for (t = lpart; !needs_quote && *t != 0; t++)
1008 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1009 (*t != '.' || t == lpart || t[1] == 0);
1012 if (!needs_quote) return lpart;
1015 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1019 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1022 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1025 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1026 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1027 yield = string_cat(yield, &size, &ptr, nq, 1);
1031 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1039 /*************************************************
1040 * Load readline() functions *
1041 *************************************************/
1043 /* This function is called from testing executions that read data from stdin,
1044 but only when running as the calling user. Currently, only -be does this. The
1045 function loads the readline() function library and passes back the functions.
1046 On some systems, it needs the curses library, so load that too, but try without
1047 it if loading fails. All this functionality has to be requested at build time.
1050 fn_readline_ptr pointer to where to put the readline pointer
1051 fn_addhist_ptr pointer to where to put the addhistory function
1053 Returns: the dlopen handle or NULL on failure
1057 set_readline(char * (**fn_readline_ptr)(char *),
1058 char * (**fn_addhist_ptr)(char *))
1061 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1063 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1064 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1066 if (dlhandle != NULL)
1068 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1069 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1073 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1082 /*************************************************
1083 * Get a line from stdin for testing things *
1084 *************************************************/
1086 /* This function is called when running tests that can take a number of lines
1087 of input (for example, -be and -bt). It handles continuations and trailing
1088 spaces. And prompting and a blank line output on eof. If readline() is in use,
1089 the arguments are non-NULL and provide the relevant functions.
1092 fn_readline readline function or NULL
1093 fn_addhist addhist function or NULL
1095 Returns: pointer to dynamic memory, or NULL at end of file
1099 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1104 uschar *yield = NULL;
1106 if (fn_readline == NULL) printf("> ");
1110 uschar buffer[1024];
1114 char *readline_line = NULL;
1115 if (fn_readline != NULL)
1117 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1118 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1119 p = US readline_line;
1124 /* readline() not in use */
1127 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1131 /* Handle the line */
1133 ss = p + (int)Ustrlen(p);
1134 while (ss > p && isspace(ss[-1])) ss--;
1138 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1141 yield = string_cat(yield, &size, &ptr, p, ss - p);
1144 if (fn_readline != NULL) free(readline_line);
1147 if (ss == p || yield[ptr-1] != '\\')
1155 if (yield == NULL) printf("\n");
1161 /*************************************************
1162 * Entry point and high-level code *
1163 *************************************************/
1165 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1166 the appropriate action. All the necessary functions are present in the one
1167 binary. I originally thought one should split it up, but it turns out that so
1168 much of the apparatus is needed in each chunk that one might as well just have
1169 it all available all the time, which then makes the coding easier as well.
1172 argc count of entries in argv
1173 argv argument strings, with argv[0] being the program name
1175 Returns: EXIT_SUCCESS if terminated successfully
1176 EXIT_FAILURE otherwise, except when a message has been sent
1177 to the sender, and -oee was given
1181 main(int argc, char **cargv)
1183 uschar **argv = USS cargv;
1184 int arg_receive_timeout = -1;
1185 int arg_smtp_receive_timeout = -1;
1186 int arg_error_handling = error_handling;
1190 int list_queue_option = 0;
1192 int msg_action_arg = -1;
1193 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1194 int queue_only_reason = 0;
1196 int perl_start_option = 0;
1198 int recipients_arg = argc;
1199 int sender_address_domain = 0;
1200 int test_retry_arg = -1;
1201 int test_rewrite_arg = -1;
1202 BOOL arg_queue_only = FALSE;
1203 BOOL bi_option = FALSE;
1204 BOOL checking = FALSE;
1205 BOOL count_queue = FALSE;
1206 BOOL expansion_test = FALSE;
1207 BOOL extract_recipients = FALSE;
1208 BOOL forced_delivery = FALSE;
1209 BOOL f_end_dot = FALSE;
1210 BOOL deliver_give_up = FALSE;
1211 BOOL list_queue = FALSE;
1212 BOOL list_options = FALSE;
1213 BOOL local_queue_only;
1215 BOOL one_msg_action = FALSE;
1216 BOOL queue_only_set = FALSE;
1217 BOOL receiving_message = TRUE;
1219 BOOL removed_privilege = FALSE;
1220 BOOL verify_address_mode = FALSE;
1221 BOOL verify_as_sender = FALSE;
1222 BOOL version_printed = FALSE;
1223 uschar *alias_arg = NULL;
1224 uschar *called_as = US"";
1225 uschar *start_queue_run_id = NULL;
1226 uschar *stop_queue_run_id = NULL;
1227 uschar *ftest_domain = NULL;
1228 uschar *ftest_localpart = NULL;
1229 uschar *ftest_prefix = NULL;
1230 uschar *ftest_suffix = NULL;
1231 uschar *real_sender_address;
1232 uschar *originator_home = US"/";
1233 BOOL ftest_system = FALSE;
1237 struct stat statbuf;
1238 pid_t passed_qr_pid = (pid_t)0;
1239 int passed_qr_pipe = -1;
1240 gid_t group_list[NGROUPS_MAX];
1242 /* Possible options for -R and -S */
1244 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1246 /* Need to define this in case we need to change the environment in order
1247 to get rid of a bogus time zone. We have to make it char rather than uschar
1248 because some OS define it in /usr/include/unistd.h. */
1250 extern char **environ;
1252 /* If the Exim user and/or group and/or the configuration file owner/group were
1253 defined by ref:name at build time, we must now find the actual uid/gid values.
1254 This is a feature to make the lives of binary distributors easier. */
1256 #ifdef EXIM_USERNAME
1257 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1259 exim_gid = pw->pw_gid;
1263 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1269 #ifdef EXIM_GROUPNAME
1270 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1272 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1278 #ifdef CONFIGURE_OWNERNAME
1279 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1281 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1282 CONFIGURE_OWNERNAME);
1287 #ifdef CONFIGURE_GROUPNAME
1288 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1290 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1291 CONFIGURE_GROUPNAME);
1296 /* In the Cygwin environment, some initialization needs doing. It is fudged
1297 in by means of this macro. */
1303 /* Check a field which is patched when we are running Exim within its
1304 testing harness; do a fast initial check, and then the whole thing. */
1306 running_in_test_harness =
1307 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1309 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1310 at the start of a program; however, it seems that some environments do not
1311 follow this. A "strange" locale can affect the formatting of timestamps, so we
1314 setlocale(LC_ALL, "C");
1316 /* Set up the default handler for timing using alarm(). */
1318 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1320 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1321 because store_malloc writes a log entry on failure. */
1323 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1324 if (log_buffer == NULL)
1326 fprintf(stderr, "exim: failed to get store for log buffer\n");
1330 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1331 NULL when the daemon is run and the file is closed. We have to use this
1332 indirection, because some systems don't allow writing to the variable "stderr".
1335 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1337 /* Arrange for the PCRE regex library to use our store functions. Note that
1338 the normal calls are actually macros that add additional arguments for
1339 debugging purposes so we have to assign specially constructed functions here.
1340 The default is to use store in the stacking pool, but this is overridden in the
1341 regex_must_compile() function. */
1343 pcre_malloc = function_store_get;
1344 pcre_free = function_dummy_free;
1346 /* Ensure there is a big buffer for temporary use in several places. It is put
1347 in malloc store so that it can be freed for enlargement if necessary. */
1349 big_buffer = store_malloc(big_buffer_size);
1351 /* Set up the handler for the data request signal, and set the initial
1352 descriptive text. */
1354 set_process_info("initializing");
1355 os_restarting_signal(SIGUSR1, usr1_handler);
1357 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1358 in the daemon code. For the rest of Exim's uses, we ignore it. */
1360 signal(SIGHUP, SIG_IGN);
1362 /* We don't want to die on pipe errors as the code is written to handle
1363 the write error instead. */
1365 signal(SIGPIPE, SIG_IGN);
1367 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1368 set to SIG_IGN. This causes subprocesses that complete before the parent
1369 process waits for them not to hang around, so when Exim calls wait(), nothing
1370 is there. The wait() code has been made robust against this, but let's ensure
1371 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1372 ending status. We use sigaction rather than plain signal() on those OS where
1373 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1374 problem on AIX with this.) */
1378 struct sigaction act;
1379 act.sa_handler = SIG_DFL;
1380 sigemptyset(&(act.sa_mask));
1382 sigaction(SIGCHLD, &act, NULL);
1385 signal(SIGCHLD, SIG_DFL);
1388 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1393 /* Set up the version number. Set up the leading 'E' for the external form of
1394 message ids, set the pointer to the internal form, and initialize it to
1395 indicate no message being processed. */
1398 message_id_option[0] = '-';
1399 message_id_external = message_id_option + 1;
1400 message_id_external[0] = 'E';
1401 message_id = message_id_external + 1;
1404 /* Set the umask to zero so that any files that Exim creates are created
1405 with the modes that it specifies. */
1409 /* Precompile the regular expression for matching a message id. Keep this in
1410 step with the code that generates ids in the accept.c module. We need to do
1411 this here, because the -M options check their arguments for syntactic validity
1412 using mac_ismsgid, which uses this. */
1415 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1417 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1418 this seems to be a generally accepted convention, since one finds symbolic
1419 links called "mailq" in standard OS configurations. */
1421 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1422 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1425 receiving_message = FALSE;
1426 called_as = US"-mailq";
1429 /* If the program is called as "rmail" treat it as equivalent to
1430 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1431 i.e. preventing a single dot on a line from terminating the message, and
1432 returning with zero return code, even in cases of error (provided an error
1433 message has been sent). */
1435 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1436 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1439 called_as = US"-rmail";
1440 errors_sender_rc = EXIT_SUCCESS;
1443 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1444 this is a smail convention. */
1446 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1447 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1449 smtp_input = smtp_batched_input = TRUE;
1450 called_as = US"-rsmtp";
1453 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1454 this is a smail convention. */
1456 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1457 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1460 receiving_message = FALSE;
1461 called_as = US"-runq";
1464 /* If the program is called as "newaliases" treat it as equivalent to
1465 "exim -bi"; this is a sendmail convention. */
1467 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1468 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1471 receiving_message = FALSE;
1472 called_as = US"-newaliases";
1475 /* Save the original effective uid for a couple of uses later. It should
1476 normally be root, but in some esoteric environments it may not be. */
1478 original_euid = geteuid();
1480 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1481 to be the same as the real ones. This makes a difference only if Exim is setuid
1482 (or setgid) to something other than root, which could be the case in some
1483 special configurations. */
1485 real_uid = getuid();
1486 real_gid = getgid();
1488 if (real_uid == root_uid)
1494 /* If neither the original real uid nor the original euid was root, Exim is
1495 running in an unprivileged state. */
1497 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1499 /* If the first argument is --help, pretend there are no arguments. This will
1500 cause a brief message to be given. */
1502 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1504 /* Scan the program's arguments. Some can be dealt with right away; others are
1505 simply recorded for checking and handling afterwards. Do a high-level switch
1506 on the second character (the one after '-'), to save some effort. */
1508 for (i = 1; i < argc; i++)
1510 BOOL badarg = FALSE;
1511 uschar *arg = argv[i];
1515 /* An argument not starting with '-' is the start of a recipients list;
1516 break out of the options-scanning loop. */
1524 /* An option consistion of -- terminates the options */
1526 if (Ustrcmp(arg, "--") == 0)
1528 recipients_arg = i + 1;
1532 /* Handle flagged options */
1534 switchchar = arg[1];
1537 /* Make all -ex options synonymous with -oex arguments, since that
1538 is assumed by various callers. Also make -qR options synonymous with -R
1539 options, as that seems to be required as well. Allow for -qqR too, and
1540 the same for -S options. */
1542 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1543 Ustrncmp(arg+1, "qR", 2) == 0 ||
1544 Ustrncmp(arg+1, "qS", 2) == 0)
1546 switchchar = arg[2];
1549 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1551 switchchar = arg[3];
1553 queue_2stage = TRUE;
1556 /* Make -r synonymous with -f, since it is a documented alias */
1558 else if (arg[1] == 'r') switchchar = 'f';
1560 /* Make -ov synonymous with -v */
1562 else if (Ustrcmp(arg, "-ov") == 0)
1568 /* High-level switch on active initial letter */
1572 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1573 so has no need of it. */
1576 if (*argrest == 0) i++; /* Skip over the type */
1581 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1583 /* -bd: Run in daemon mode, awaiting SMTP connections.
1584 -bdf: Ditto, but in the foreground.
1587 if (*argrest == 'd')
1589 daemon_listen = TRUE;
1590 if (*(++argrest) == 'f') background_daemon = FALSE;
1591 else if (*argrest != 0) { badarg = TRUE; break; }
1594 /* -be: Run in expansion test mode */
1596 else if (*argrest == 'e')
1597 expansion_test = checking = TRUE;
1599 /* -bf: Run in mail filter testing mode
1600 -bF: Ditto, but for system filters
1601 -bfd: Set domain for filter testing
1602 -bfl: Set local part for filter testing
1603 -bfp: Set prefix for filter testing
1604 -bfs: Set suffix for filter testing
1607 else if (*argrest == 'f' || *argrest == 'F')
1609 ftest_system = *argrest++ == 'F';
1612 if(++i < argc) filter_test = argv[i]; else
1614 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1622 fprintf(stderr, "exim: string expected after %s\n", arg);
1625 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1626 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1627 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1628 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1629 else { badarg = TRUE; break; }
1633 /* -bh: Host checking - an IP address must follow. */
1635 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1637 if (++i >= argc) { badarg = TRUE; break; }
1638 sender_host_address = argv[i];
1639 host_checking = checking = log_testing_mode = TRUE;
1640 host_checking_callout = argrest[1] == 'c';
1643 /* -bi: This option is used by sendmail to initialize *the* alias file,
1644 though it has the -oA option to specify a different file. Exim has no
1645 concept of *the* alias file, but since Sun's YP make script calls
1646 sendmail this way, some support must be provided. */
1648 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1650 /* -bm: Accept and deliver message - the default option. Reinstate
1651 receiving_message, which got turned off for all -b options. */
1653 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1655 /* -bnq: For locally originating messages, do not qualify unqualified
1656 addresses. In the envelope, this causes errors; in header lines they
1659 else if (Ustrcmp(argrest, "nq") == 0)
1661 allow_unqualified_sender = FALSE;
1662 allow_unqualified_recipient = FALSE;
1665 /* -bpxx: List the contents of the mail queue, in various forms. If
1666 the option is -bpc, just a queue count is needed. Otherwise, if the
1667 first letter after p is r, then order is random. */
1669 else if (*argrest == 'p')
1671 if (*(++argrest) == 'c')
1674 if (*(++argrest) != 0) badarg = TRUE;
1678 if (*argrest == 'r')
1680 list_queue_option = 8;
1683 else list_queue_option = 0;
1687 /* -bp: List the contents of the mail queue, top-level only */
1689 if (*argrest == 0) {}
1691 /* -bpu: List the contents of the mail queue, top-level undelivered */
1693 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1695 /* -bpa: List the contents of the mail queue, including all delivered */
1697 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1699 /* Unknown after -bp[r] */
1709 /* -bP: List the configuration variables given as the address list.
1710 Force -v, so configuration errors get displayed. */
1712 else if (Ustrcmp(argrest, "P") == 0)
1714 list_options = TRUE;
1715 debug_selector |= D_v;
1716 debug_file = stderr;
1719 /* -brt: Test retry configuration lookup */
1721 else if (Ustrcmp(argrest, "rt") == 0)
1723 test_retry_arg = i + 1;
1727 /* -brw: Test rewrite configuration */
1729 else if (Ustrcmp(argrest, "rw") == 0)
1731 test_rewrite_arg = i + 1;
1735 /* -bS: Read SMTP commands on standard input, but produce no replies -
1736 all errors are reported by sending messages. */
1738 else if (Ustrcmp(argrest, "S") == 0)
1739 smtp_input = smtp_batched_input = receiving_message = TRUE;
1741 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1742 on standard output. */
1744 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1746 /* -bt: address testing mode */
1748 else if (Ustrcmp(argrest, "t") == 0)
1749 address_test_mode = checking = log_testing_mode = TRUE;
1751 /* -bv: verify addresses */
1753 else if (Ustrcmp(argrest, "v") == 0)
1754 verify_address_mode = checking = log_testing_mode = TRUE;
1756 /* -bvs: verify sender addresses */
1758 else if (Ustrcmp(argrest, "vs") == 0)
1760 verify_address_mode = checking = log_testing_mode = TRUE;
1761 verify_as_sender = TRUE;
1764 /* -bV: Print version string and support details */
1766 else if (Ustrcmp(argrest, "V") == 0)
1768 printf("Exim version %s #%s built %s\n", version_string,
1769 version_cnumber, version_date);
1770 printf("%s\n", CS version_copyright);
1771 version_printed = TRUE;
1772 show_whats_supported(stdout);
1779 /* -C: change configuration file list; ignore if it isn't really
1780 a change! Enforce a prefix check if required. */
1785 if(++i < argc) argrest = argv[i]; else
1786 { badarg = TRUE; break; }
1788 if (Ustrcmp(config_main_filelist, argrest) != 0)
1790 #ifdef ALT_CONFIG_PREFIX
1792 int len = Ustrlen(ALT_CONFIG_PREFIX);
1793 uschar *list = argrest;
1795 while((filename = string_nextinlist(&list, &sep, big_buffer,
1796 big_buffer_size)) != NULL)
1798 if ((Ustrlen(filename) < len ||
1799 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1800 Ustrstr(filename, "/../") != NULL) &&
1801 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1803 fprintf(stderr, "-C Permission denied\n");
1809 config_main_filelist = argrest;
1810 config_changed = TRUE;
1815 /* -D: set up a macro definition */
1818 #ifdef DISABLE_D_OPTION
1819 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1824 macro_item *mlast = NULL;
1827 uschar *s = argrest;
1829 while (isspace(*s)) s++;
1831 if (*s < 'A' || *s > 'Z')
1833 fprintf(stderr, "exim: macro name set by -D must start with "
1834 "an upper case letter\n");
1838 while (isalnum(*s) || *s == '_')
1840 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1844 if (ptr == 0) { badarg = TRUE; break; }
1845 while (isspace(*s)) s++;
1848 if (*s++ != '=') { badarg = TRUE; break; }
1849 while (isspace(*s)) s++;
1852 for (m = macros; m != NULL; m = m->next)
1854 if (Ustrcmp(m->name, name) == 0)
1856 fprintf(stderr, "exim: duplicated -D in command line\n");
1862 m = store_get(sizeof(macro_item) + Ustrlen(name));
1864 m->command_line = TRUE;
1865 if (mlast == NULL) macros = m; else mlast->next = m;
1866 Ustrcpy(m->name, name);
1867 m->replacement = string_copy(s);
1869 if (clmacro_count >= MAX_CLMACROS)
1871 fprintf(stderr, "exim: too many -D options on command line\n");
1874 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1880 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1881 The latter is now a no-op, retained for compatibility only. If -dd is used,
1882 debugging subprocesses of the daemon is disabled. */
1885 if (Ustrcmp(argrest, "ropcr") == 0)
1887 /* drop_cr = TRUE; */
1890 /* Use an intermediate variable so that we don't set debugging while
1891 decoding the debugging bits. */
1895 unsigned int selector = D_default;
1898 if (*argrest == 'd')
1900 debug_daemon = TRUE;
1904 decode_bits(&selector, NULL, argrest, debug_options,
1905 debug_options_count, US"debug");
1906 debug_selector = selector;
1911 /* -E: This is a local error message. This option is not intended for
1912 external use at all, but is not restricted to trusted callers because it
1913 does no harm (just suppresses certain error messages) and if Exim is run
1914 not setuid root it won't always be trusted when it generates error
1915 messages using this option. If there is a message id following -E, point
1916 message_reference at it, for logging. */
1919 local_error_message = TRUE;
1920 if (mac_ismsgid(argrest)) message_reference = argrest;
1924 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1925 option, so it looks as if historically the -oex options are also callable
1926 without the leading -o. So we have to accept them. Before the switch,
1927 anything starting -oe has been converted to -e. Exim does not support all
1928 of the sendmail error options. */
1931 if (Ustrcmp(argrest, "e") == 0)
1933 arg_error_handling = ERRORS_SENDER;
1934 errors_sender_rc = EXIT_SUCCESS;
1936 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1937 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1938 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1939 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1944 /* -F: Set sender's full name, used instead of the gecos entry from
1945 the password file. Since users can usually alter their gecos entries,
1946 there's no security involved in using this instead. The data can follow
1947 the -F or be in the next argument. */
1952 if(++i < argc) argrest = argv[i]; else
1953 { badarg = TRUE; break; }
1955 originator_name = argrest;
1959 /* -f: Set sender's address - this value is only actually used if Exim is
1960 run by a trusted user, or if untrusted_set_sender is set and matches the
1961 address, except that the null address can always be set by any user. The
1962 test for this happens later, when the value given here is ignored when not
1963 permitted. For an untrusted user, the actual sender is still put in Sender:
1964 if it doesn't match the From: header (unless no_local_from_check is set).
1965 The data can follow the -f or be in the next argument. The -r switch is an
1966 obsolete form of -f but since there appear to be programs out there that
1967 use anything that sendmail has ever supported, better accept it - the
1968 synonymizing is done before the switch above.
1970 At this stage, we must allow domain literal addresses, because we don't
1971 know what the setting of allow_domain_literals is yet. Ditto for trailing
1972 dots and strip_trailing_dot. */
1980 if (i+1 < argc) argrest = argv[++i]; else
1981 { badarg = TRUE; break; }
1985 sender_address = string_sprintf(""); /* Ensure writeable memory */
1989 uschar *temp = argrest + Ustrlen(argrest) - 1;
1990 while (temp >= argrest && isspace(*temp)) temp--;
1991 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
1992 allow_domain_literals = TRUE;
1993 strip_trailing_dot = TRUE;
1994 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
1995 &sender_address_domain, TRUE);
1996 allow_domain_literals = FALSE;
1997 strip_trailing_dot = FALSE;
1998 if (sender_address == NULL)
2000 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2001 return EXIT_FAILURE;
2004 sender_address_forced = TRUE;
2008 /* This is some Sendmail thing which can be ignored */
2013 /* -h: Set the hop count for an incoming message. Exim does not currently
2014 support this; it always computes it by counting the Received: headers.
2015 To put it in will require a change to the spool header file format. */
2020 if(++i < argc) argrest = argv[i]; else
2021 { badarg = TRUE; break; }
2023 if (!isdigit(*argrest)) badarg = TRUE;
2027 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2028 not to be documented for sendmail but mailx (at least) uses it) */
2031 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2036 receiving_message = FALSE;
2038 /* -MC: continue delivery of another message via an existing open
2039 file descriptor. This option is used for an internal call by the
2040 smtp transport when there is a pending message waiting to go to an
2041 address to which it has got a connection. Five subsequent arguments are
2042 required: transport name, host name, IP address, sequence number, and
2043 message_id. Transports may decline to create new processes if the sequence
2044 number gets too big. The channel is stdin. This (-MC) must be the last
2045 argument. There's a subsequent check that the real-uid is privileged.
2047 If we are running in the test harness. delay for a bit, to let the process
2048 that set this one up complete. This makes for repeatability of the logging,
2051 if (Ustrcmp(argrest, "C") == 0)
2055 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2056 return EXIT_FAILURE;
2059 if (msg_action_arg >= 0)
2061 fprintf(stderr, "exim: incompatible arguments\n");
2062 return EXIT_FAILURE;
2065 continue_transport = argv[++i];
2066 continue_hostname = argv[++i];
2067 continue_host_address = argv[++i];
2068 continue_sequence = Uatoi(argv[++i]);
2069 msg_action = MSG_DELIVER;
2070 msg_action_arg = ++i;
2071 forced_delivery = TRUE;
2072 queue_run_pid = passed_qr_pid;
2073 queue_run_pipe = passed_qr_pipe;
2075 if (!mac_ismsgid(argv[i]))
2077 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2079 return EXIT_FAILURE;
2082 if (running_in_test_harness) millisleep(500);
2086 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2087 precedes -MC (see above). The flag indicates that the host to which
2088 Exim is connected has accepted an AUTH sequence. */
2090 else if (Ustrcmp(argrest, "CA") == 0)
2092 smtp_authenticated = TRUE;
2096 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2097 it preceded -MC (see above) */
2099 else if (Ustrcmp(argrest, "CP") == 0)
2101 smtp_use_pipelining = TRUE;
2105 /* -MCQ: pass on the pid of the queue-running process that started
2106 this chain of deliveries and the fd of its synchronizing pipe; this
2107 is useful only when it precedes -MC (see above) */
2109 else if (Ustrcmp(argrest, "CQ") == 0)
2111 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2113 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2118 /* -MCS: set the smtp_use_size flag; this is useful only when it
2119 precedes -MC (see above) */
2121 else if (Ustrcmp(argrest, "CS") == 0)
2123 smtp_use_size = TRUE;
2127 /* -MCT: set the tls_offered flag; this is useful only when it
2128 precedes -MC (see above). The flag indicates that the host to which
2129 Exim is connected has offered TLS support. */
2132 else if (Ustrcmp(argrest, "CT") == 0)
2139 /* -M[x]: various operations on the following list of message ids:
2140 -M deliver the messages, ignoring next retry times and thawing
2141 -Mc deliver the messages, checking next retry times, no thawing
2142 -Mf freeze the messages
2143 -Mg give up on the messages
2144 -Mt thaw the messages
2145 -Mrm remove the messages
2146 In the above cases, this must be the last option. There are also the
2147 following options which are followed by a single message id, and which
2148 act on that message. Some of them use the "recipient" addresses as well.
2149 -Mar add recipient(s)
2150 -Mmad mark all recipients delivered
2151 -Mmd mark recipients(s) delivered
2158 else if (*argrest == 0)
2160 msg_action = MSG_DELIVER;
2161 forced_delivery = deliver_force_thaw = TRUE;
2163 else if (Ustrcmp(argrest, "ar") == 0)
2165 msg_action = MSG_ADD_RECIPIENT;
2166 one_msg_action = TRUE;
2168 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2169 else if (Ustrcmp(argrest, "es") == 0)
2171 msg_action = MSG_EDIT_SENDER;
2172 one_msg_action = TRUE;
2174 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2175 else if (Ustrcmp(argrest, "g") == 0)
2177 msg_action = MSG_DELIVER;
2178 deliver_give_up = TRUE;
2180 else if (Ustrcmp(argrest, "mad") == 0)
2182 msg_action = MSG_MARK_ALL_DELIVERED;
2184 else if (Ustrcmp(argrest, "md") == 0)
2186 msg_action = MSG_MARK_DELIVERED;
2187 one_msg_action = TRUE;
2189 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2190 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2191 else if (Ustrcmp(argrest, "vb") == 0)
2193 msg_action = MSG_SHOW_BODY;
2194 one_msg_action = TRUE;
2196 else if (Ustrcmp(argrest, "vh") == 0)
2198 msg_action = MSG_SHOW_HEADER;
2199 one_msg_action = TRUE;
2201 else if (Ustrcmp(argrest, "vl") == 0)
2203 msg_action = MSG_SHOW_LOG;
2204 one_msg_action = TRUE;
2206 else { badarg = TRUE; break; }
2208 /* All the -Mxx options require at least one message id. */
2210 msg_action_arg = i + 1;
2211 if (msg_action_arg >= argc)
2213 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2214 return EXIT_FAILURE;
2217 /* Some require only message ids to follow */
2219 if (!one_msg_action)
2222 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2224 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2226 return EXIT_FAILURE;
2228 goto END_ARG; /* Remaining args are ids */
2231 /* Others require only one message id, possibly followed by addresses,
2232 which will be handled as normal arguments. */
2236 if (!mac_ismsgid(argv[msg_action_arg]))
2238 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2239 argv[msg_action_arg], arg);
2240 return EXIT_FAILURE;
2247 /* Some programs seem to call the -om option without the leading o;
2248 for sendmail it askes for "me too". Exim always does this. */
2251 if (*argrest != 0) badarg = TRUE;
2255 /* -N: don't do delivery - a debugging option that stops transports doing
2256 their thing. It implies debugging at the D_v level. */
2261 dont_deliver = TRUE;
2262 debug_selector |= D_v;
2263 debug_file = stderr;
2269 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2275 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2276 option to the specified value. This form uses long names. We need to handle
2277 -O option=value and -Ooption=value. */
2284 fprintf(stderr, "exim: string expected after -O\n");
2292 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2295 if (*argrest == 'A')
2297 alias_arg = argrest + 1;
2298 if (alias_arg[0] == 0)
2300 if (i+1 < argc) alias_arg = argv[++i]; else
2302 fprintf(stderr, "exim: string expected after -oA\n");
2308 /* -oB: Set a connection message max value for remote deliveries */
2310 else if (*argrest == 'B')
2312 uschar *p = argrest + 1;
2315 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2317 connection_max_messages = 1;
2326 fprintf(stderr, "exim: number expected after -oB\n");
2329 connection_max_messages = Uatoi(p);
2333 /* -odb: background delivery */
2335 else if (Ustrcmp(argrest, "db") == 0)
2337 synchronous_delivery = FALSE;
2338 arg_queue_only = FALSE;
2339 queue_only_set = TRUE;
2342 /* -odf: foreground delivery (smail-compatible option); same effect as
2343 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2346 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2348 synchronous_delivery = TRUE;
2349 arg_queue_only = FALSE;
2350 queue_only_set = TRUE;
2353 /* -odq: queue only */
2355 else if (Ustrcmp(argrest, "dq") == 0)
2357 synchronous_delivery = FALSE;
2358 arg_queue_only = TRUE;
2359 queue_only_set = TRUE;
2362 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2363 but no remote delivery */
2365 else if (Ustrcmp(argrest, "dqs") == 0)
2368 arg_queue_only = FALSE;
2369 queue_only_set = TRUE;
2372 /* -oex: Sendmail error flags. As these are also accepted without the
2373 leading -o prefix, for compatibility with vacation and other callers,
2374 they are handled with -e above. */
2376 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2377 -oitrue: Another sendmail syntax for the same */
2379 else if (Ustrcmp(argrest, "i") == 0 ||
2380 Ustrcmp(argrest, "itrue") == 0)
2383 /* -oM*: Set various characteristics for an incoming message; actually
2384 acted on for trusted callers only. */
2386 else if (*argrest == 'M')
2390 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2394 /* -oMa: Set sender host address */
2396 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2398 /* -oMaa: Set authenticator name */
2400 else if (Ustrcmp(argrest, "Maa") == 0)
2401 sender_host_authenticated = argv[++i];
2403 /* -oMas: setting authenticated sender */
2405 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2407 /* -oMai: setting authenticated id */
2409 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2411 /* -oMi: Set incoming interface address */
2413 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2415 /* -oMr: Received protocol */
2417 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2419 /* -oMs: Set sender host name */
2421 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2423 /* -oMt: Set sender ident */
2425 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2427 /* Else a bad argument */
2436 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2437 seem to call this as -m (undocumented), so that is also accepted (see
2440 else if (Ustrcmp(argrest, "m") == 0) {}
2442 /* -oo: An ancient flag for old-style addresses which still seems to
2443 crop up in some calls (see in SCO). */
2445 else if (Ustrcmp(argrest, "o") == 0) {}
2447 /* -oP <name>: set pid file path for daemon */
2449 else if (Ustrcmp(argrest, "P") == 0)
2450 override_pid_file_path = argv[++i];
2452 /* -or <n>: set timeout for non-SMTP acceptance
2453 -os <n>: set timeout for SMTP acceptance */
2455 else if (*argrest == 'r' || *argrest == 's')
2457 int *tp = (*argrest == 'r')?
2458 &arg_receive_timeout : &arg_smtp_receive_timeout;
2459 if (argrest[1] == 0)
2461 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2463 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2466 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2471 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2473 else if (Ustrcmp(argrest, "X") == 0)
2474 override_local_interfaces = argv[++i];
2476 /* Unknown -o argument */
2482 /* -ps: force Perl startup; -pd force delayed Perl startup */
2486 if (*argrest == 's' && argrest[1] == 0)
2488 perl_start_option = 1;
2491 if (*argrest == 'd' && argrest[1] == 0)
2493 perl_start_option = -1;
2498 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2499 which sets the host protocol and host name */
2503 if (i+1 < argc) argrest = argv[++i]; else
2504 { badarg = TRUE; break; }
2509 uschar *hn = Ustrchr(argrest, ':');
2512 received_protocol = argrest;
2516 received_protocol = string_copyn(argrest, hn - argrest);
2517 sender_host_name = hn + 1;
2524 receiving_message = FALSE;
2526 /* -qq...: Do queue runs in a 2-stage manner */
2528 if (*argrest == 'q')
2530 queue_2stage = TRUE;
2534 /* -qi...: Do only first (initial) deliveries */
2536 if (*argrest == 'i')
2538 queue_run_first_delivery = TRUE;
2542 /* -qf...: Run the queue, forcing deliveries
2543 -qff..: Ditto, forcing thawing as well */
2545 if (*argrest == 'f')
2547 queue_run_force = TRUE;
2548 if (*(++argrest) == 'f')
2550 deliver_force_thaw = TRUE;
2555 /* -q[f][f]l...: Run the queue only on local deliveries */
2557 if (*argrest == 'l')
2559 queue_run_local = TRUE;
2563 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2564 optionally starting from a given message id. */
2566 if (*argrest == 0 &&
2567 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2570 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2571 start_queue_run_id = argv[++i];
2572 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2573 stop_queue_run_id = argv[++i];
2576 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2577 optionally local only. */
2582 queue_interval = readconf_readtime(argrest, 0, FALSE);
2584 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2585 if (queue_interval <= 0)
2587 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2594 case 'R': /* Synonymous with -qR... */
2595 receiving_message = FALSE;
2597 /* -Rf: As -R (below) but force all deliveries,
2598 -Rff: Ditto, but also thaw all frozen messages,
2599 -Rr: String is regex
2600 -Rrf: Regex and force
2601 -Rrff: Regex and force and thaw
2603 in all cases provided there are no further characters in this
2609 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2611 if (Ustrcmp(argrest, rsopts[i]) == 0)
2613 if (i != 2) queue_run_force = TRUE;
2614 if (i >= 2) deliver_selectstring_regex = TRUE;
2615 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2616 argrest += Ustrlen(rsopts[i]);
2621 /* -R: Set string to match in addresses for forced queue run to
2622 pick out particular messages. */
2626 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2628 fprintf(stderr, "exim: string expected after -R\n");
2632 else deliver_selectstring = argrest;
2633 if (queue_interval < 0) queue_interval = 0;
2637 /* -r: an obsolete synonym for -f (see above) */
2640 /* -S: Like -R but works on sender. */
2642 case 'S': /* Synonymous with -qS... */
2643 receiving_message = FALSE;
2645 /* -Sf: As -S (below) but force all deliveries,
2646 -Sff: Ditto, but also thaw all frozen messages,
2647 -Sr: String is regex
2648 -Srf: Regex and force
2649 -Srff: Regex and force and thaw
2651 in all cases provided there are no further characters in this
2657 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2659 if (Ustrcmp(argrest, rsopts[i]) == 0)
2661 if (i != 2) queue_run_force = TRUE;
2662 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2663 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2664 argrest += Ustrlen(rsopts[i]);
2669 /* -S: Set string to match in addresses for forced queue run to
2670 pick out particular messages. */
2674 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2676 fprintf(stderr, "exim: string expected after -S\n");
2680 else deliver_selectstring_sender = argrest;
2681 if (queue_interval < 0) queue_interval = 0;
2684 /* -Tqt is an option that is exclusively for use by the testing suite.
2685 It is not recognized in other circumstances. It allows for the setting up
2686 of explicit "queue times" so that various warning/retry things can be
2687 tested. Otherwise variability of clock ticks etc. cause problems. */
2690 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2691 fudged_queue_times = argv[++i];
2696 /* -t: Set flag to extract recipients from body of message. */
2699 if (*argrest == 0) extract_recipients = TRUE;
2701 /* -ti: Set flag to extract recipients from body of message, and also
2702 specify that dot does not end the message. */
2704 else if (Ustrcmp(argrest, "i") == 0)
2706 extract_recipients = TRUE;
2710 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2713 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2720 /* -U: This means "initial user submission" in sendmail, apparently. The
2721 doc claims that in future sendmail may refuse syntactically invalid
2722 messages instead of fixing them. For the moment, we just ignore it. */
2728 /* -v: verify things - this is a very low-level debugging */
2733 debug_selector |= D_v;
2734 debug_file = stderr;
2740 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2742 The -x flag tells the sendmail command that mail from a local
2743 mail program has National Language Support (NLS) extended characters
2744 in the body of the mail item. The sendmail command can send mail with
2745 extended NLS characters across networks that normally corrupts these
2748 As Exim is 8-bit clean, it just ignores this flag. */
2751 if (*argrest != 0) badarg = TRUE;
2754 /* All other initial characters are errors */
2759 } /* End of high-level switch statement */
2761 /* Failed to recognize the option, or syntax error */
2765 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2766 "option %s\n", arg);
2772 /* Arguments have been processed. Check for incompatibilities. */
2776 (smtp_input || extract_recipients || recipients_arg < argc) &&
2777 (daemon_listen || queue_interval >= 0 || bi_option ||
2778 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2779 filter_test != NULL || (msg_action_arg > 0 && !one_msg_action))
2782 msg_action_arg > 0 &&
2783 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2784 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2787 (daemon_listen || queue_interval >= 0) &&
2788 (sender_address != NULL || list_options || list_queue || checking ||
2792 daemon_listen && queue_interval == 0
2796 (checking || smtp_input || extract_recipients ||
2797 filter_test != NULL || bi_option)
2800 verify_address_mode &&
2801 (address_test_mode || smtp_input || extract_recipients ||
2802 filter_test != NULL || bi_option)
2805 address_test_mode && (smtp_input || extract_recipients ||
2806 filter_test != NULL || bi_option)
2809 smtp_input && (sender_address != NULL || filter_test != NULL ||
2813 deliver_selectstring != NULL && queue_interval < 0
2817 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2821 /* If debugging is set up, set the file and the file descriptor to pass on to
2822 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2823 to run in the foreground. */
2825 if (debug_selector != 0)
2827 debug_file = stderr;
2828 debug_fd = fileno(debug_file);
2829 background_daemon = FALSE;
2830 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2831 if (debug_selector != D_v) /* -v only doesn't show this */
2833 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2834 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2836 show_whats_supported(stderr);
2840 /* When started with root privilege, ensure that the limits on the number of
2841 open files and the number of processes (where that is accessible) are
2842 sufficiently large, or are unset, in case Exim has been called from an
2843 environment where the limits are screwed down. Not all OS have the ability to
2844 change some of these limits. */
2848 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2854 #ifdef RLIMIT_NOFILE
2855 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2857 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2859 rlp.rlim_cur = rlp.rlim_max = 0;
2862 /* I originally chose 1000 as a nice big number that was unlikely to
2863 be exceeded. It turns out that some older OS have a fixed upper limit of
2866 if (rlp.rlim_cur < 1000)
2868 rlp.rlim_cur = rlp.rlim_max = 1000;
2869 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2871 rlp.rlim_cur = rlp.rlim_max = 256;
2872 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2873 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2880 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2882 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2884 rlp.rlim_cur = rlp.rlim_max = 0;
2887 #ifdef RLIM_INFINITY
2888 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2890 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2892 if (rlp.rlim_cur < 1000)
2894 rlp.rlim_cur = rlp.rlim_max = 1000;
2896 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2897 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2903 /* Exim is normally entered as root (but some special configurations are
2904 possible that don't do this). However, it always spins off sub-processes that
2905 set their uid and gid as required for local delivery. We don't want to pass on
2906 any extra groups that root may belong to, so we want to get rid of them all at
2909 We need to obey setgroups() at this stage, before possibly giving up root
2910 privilege for a changed configuration file, but later on we might need to
2911 check on the additional groups for the admin user privilege - can't do that
2912 till after reading the config, which might specify the exim gid. Therefore,
2913 save the group list here first. */
2915 group_count = getgroups(NGROUPS_MAX, group_list);
2917 /* There is a fundamental difference in some BSD systems in the matter of
2918 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2919 known not to be different. On the "different" systems there is a single group
2920 list, and the first entry in it is the current group. On all other versions of
2921 Unix there is a supplementary group list, which is in *addition* to the current
2922 group. Consequently, to get rid of all extraneous groups on a "standard" system
2923 you pass over 0 groups to setgroups(), while on a "different" system you pass
2924 over a single group - the current group, which is always the first group in the
2925 list. Calling setgroups() with zero groups on a "different" system results in
2926 an error return. The following code should cope with both types of system.
2928 However, if this process isn't running as root, setgroups() can't be used
2929 since you have to be root to run it, even if throwing away groups. Not being
2930 root here happens only in some unusual configurations. We just ignore the
2933 if (setgroups(0, NULL) != 0)
2935 if (setgroups(1, group_list) != 0 && !unprivileged)
2937 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2942 /* If the configuration file name has been altered by an argument on the
2943 command line (either a new file name or a macro definition) and the caller is
2944 not root or the exim user, or if this is a filter testing run, remove any
2945 setuid privilege the program has, and run as the underlying user.
2947 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2948 severely restricts the use of -C for some purposes.
2950 Otherwise, set the real ids to the effective values (should be root unless run
2951 from inetd, which it can either be root or the exim uid, if one is configured).
2953 There is a private mechanism for bypassing some of this, in order to make it
2954 possible to test lots of configurations automatically, without having either to
2955 recompile each time, or to patch in an actual configuration file name and other
2956 values (such as the path name). If running in the test harness, pretend that
2957 configuration file changes and macro definitions haven't happened. */
2960 (config_changed || macros != NULL) && /* Config changed, and */
2961 real_uid != root_uid && /* Not root, and */
2962 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2963 real_uid != exim_uid && /* Not exim, and */
2965 !running_in_test_harness /* Not fudged */
2967 expansion_test /* expansion testing */
2969 filter_test != NULL) /* Filter testing */
2971 setgroups(group_count, group_list);
2972 exim_setugid(real_uid, real_gid, FALSE,
2973 US"-C, -D, -be or -bf forces real uid");
2974 removed_privilege = TRUE;
2976 /* In the normal case when Exim is called like this, stderr is available
2977 and should be used for any logging information because attempts to write
2978 to the log will usually fail. To arrange this, we unset really_exim. However,
2979 if no stderr is available there is no point - we might as well have a go
2980 at the log (if it fails, syslog will be written). */
2982 if (log_stderr != NULL) really_exim = FALSE;
2985 /* Privilege is to be retained for the moment. It may be dropped later,
2986 depending on the job that this Exim process has been asked to do. For now, set
2987 the real uid to the effective so that subsequent re-execs of Exim are done by a
2990 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
2992 /* If testing a filter, open the file now, before wasting time doing other
2993 setups and reading the message. */
2995 if (filter_test != NULL)
2997 filter_fd = Uopen(filter_test, O_RDONLY,0);
3000 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test,
3002 return EXIT_FAILURE;
3006 /* Read the main runtime configuration data; this gives up if there
3007 is a failure. It leaves the configuration file open so that the subsequent
3008 configuration data for delivery can be read if needed. */
3012 /* Handle the decoding of logging options. */
3014 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3015 log_options, log_options_count, US"log");
3019 debug_printf("configuration file is %s\n", config_main_filename);
3020 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3021 log_extra_selector);
3024 /* If domain literals are not allowed, check the sender address that was
3025 supplied with -f. Ditto for a stripped trailing dot. */
3027 if (sender_address != NULL)
3029 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3031 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3032 "allowed\n", sender_address);
3033 return EXIT_FAILURE;
3035 if (f_end_dot && !strip_trailing_dot)
3037 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3038 "(trailing dot not allowed)\n", sender_address);
3039 return EXIT_FAILURE;
3043 /* Paranoia check of maximum lengths of certain strings. There is a check
3044 on the length of the log file path in log.c, which will come into effect
3045 if there are any calls to write the log earlier than this. However, if we
3046 get this far but the string is very long, it is better to stop now than to
3047 carry on and (e.g.) receive a message and then have to collapse. The call to
3048 log_write() from here will cause the ultimate panic collapse if the complete
3049 file name exceeds the buffer length. */
3051 if (Ustrlen(log_file_path) > 200)
3052 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3053 "log_file_path is longer than 200 chars: aborting");
3055 if (Ustrlen(pid_file_path) > 200)
3056 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3057 "pid_file_path is longer than 200 chars: aborting");
3059 if (Ustrlen(spool_directory) > 200)
3060 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3061 "spool_directory is longer than 200 chars: aborting");
3063 /* Length check on the process name given to syslog for its TAG field,
3064 which is only permitted to be 32 characters or less. See RFC 3164. */
3066 if (Ustrlen(syslog_processname) > 32)
3067 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3068 "syslog_processname is longer than 32 chars: aborting");
3070 /* In some operating systems, the environment variable TMPDIR controls where
3071 temporary files are created; Exim doesn't use these (apart from when delivering
3072 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3073 If TMPDIR is found in the environment, reset it to the value defined in the
3074 TMPDIR macro, if this macro is defined. */
3079 for (p = USS environ; *p != NULL; p++)
3081 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3082 Ustrcmp(*p+7, TMPDIR) != 0)
3084 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3085 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3087 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3093 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3094 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3095 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3096 called by a user who has set the TZ variable. This then affects the timestamps
3097 in log files and in Received: headers, and any created Date: header lines. The
3098 required timezone is settable in the configuration file, so nothing can be done
3099 about this earlier - but hopefully nothing will normally be logged earlier than
3100 this. We have to make a new environment if TZ is wrong, but don't bother if
3101 timestamps_utc is set, because then all times are in UTC anyway. */
3103 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3105 timestamps_utc = TRUE;
3109 uschar *envtz = US getenv("TZ");
3110 if ((envtz == NULL && timezone_string != NULL) ||
3112 (timezone_string == NULL ||
3113 Ustrcmp(timezone_string, envtz) != 0)))
3115 uschar **p = USS environ;
3119 while (*p++ != NULL) count++;
3120 if (envtz == NULL) count++;
3121 newp = new = malloc(sizeof(uschar *) * (count + 1));
3122 for (p = USS environ; *p != NULL; p++)
3124 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3127 if (timezone_string != NULL)
3129 *newp = malloc(Ustrlen(timezone_string) + 4);
3130 sprintf(CS *newp++, "TZ=%s", timezone_string);
3135 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3136 tod_stamp(tod_log));
3140 /* Handle the case when we have removed the setuid privilege because of -C or
3141 -D. This means that the caller of Exim was not root, and, provided that
3142 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3145 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3146 were running as the exim user defined in the configuration file (different to
3147 the one in the binary). The sysadmin may expect this case to retain privilege
3148 because "the binary was called by the Exim user", but it hasn't, because of the
3149 order in which it handles this stuff. There are two possibilities:
3151 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3152 to do message deliveries. Thus, the fact that it is running as a
3153 non-privileged user is plausible, and might be wanted in some special
3154 configurations. However, really_exim will have been set false when
3155 privilege was dropped, to stop Exim trying to write to its normal log
3156 files. Therefore, re-enable normal log processing, assuming the sysadmin
3157 has set up the log directory correctly.
3159 (2) If deliver_drop_privilege is not set, the configuration won't work as
3160 apparently intended, and so we log a panic message. In order to retain
3161 root for -C or -D, the caller must either be root or the Exim user
3162 defined in the binary (when deliver_drop_ privilege is false).
3164 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3165 built-in exim user or one defined in the configuration. In either event,
3166 re-enable log processing, assuming the sysadmin knows what they are doing. */
3168 if (removed_privilege && (config_changed || macros != NULL) &&
3169 real_uid == exim_uid)
3171 #ifdef ALT_CONFIG_ROOT_ONLY
3172 really_exim = TRUE; /* let logging work normally */
3175 if (deliver_drop_privilege)
3176 really_exim = TRUE; /* let logging work normally */
3178 log_write(0, LOG_MAIN|LOG_PANIC,
3179 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3180 (int)exim_uid, config_changed? "-C" : "-D");
3184 /* Start up Perl interpreter if Perl support is configured and there is a
3185 perl_startup option, and the configuration or the command line specifies
3186 initializing starting. Note that the global variables are actually called
3187 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3190 if (perl_start_option != 0)
3191 opt_perl_at_start = (perl_start_option > 0);
3192 if (opt_perl_at_start && opt_perl_startup != NULL)
3195 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3196 errstr = init_perl(opt_perl_startup);
3199 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3200 return EXIT_FAILURE;
3202 opt_perl_started = TRUE;
3204 #endif /* EXIM_PERL */
3206 /* Log the arguments of the call if the configuration file said so. This is
3207 a debugging feature for finding out what arguments certain MUAs actually use.
3208 Don't attempt it if logging is disabled, or if listing variables or if
3209 verifying/testing addresses or expansions. */
3211 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3212 && !list_options && !checking)
3215 uschar *p = big_buffer;
3217 (void)getcwd(CS p+4, big_buffer_size - 4);
3219 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3221 for (i = 0; i < argc; i++)
3223 int len = Ustrlen(argv[i]);
3226 if (p + len + 8 >= big_buffer + big_buffer_size)
3229 log_write(0, LOG_MAIN, "%s", big_buffer);
3230 Ustrcpy(big_buffer, "...");
3233 printing = string_printing(argv[i]);
3234 if (printing[0] == 0) quote = US"\""; else
3236 uschar *pp = printing;
3238 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3240 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3241 (p - big_buffer) - 4), printing, quote);
3244 log_write(0, LOG_MAIN, "%s", big_buffer);
3247 /* Set the working directory to be the top-level spool directory. We don't rely
3248 on this in the code, which always uses fully qualified names, but it's useful
3249 for core dumps etc. Don't complain if it fails - the spool directory might not
3250 be generally accessible and calls with the -C option (and others) have lost
3251 privilege by now. */
3253 if (Uchdir(spool_directory) != 0)
3255 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3256 (void)Uchdir(spool_directory);
3259 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3260 alias file. Exim doesn't have such a concept, but this call is screwed into
3261 Sun's YP makefiles. Handle this by calling a configured script, as the real
3262 user who called Exim. The -oA option can be used to pass an argument to the
3267 fclose(config_file);
3268 if (bi_command != NULL)
3272 argv[i++] = bi_command;
3273 if (alias_arg != NULL) argv[i++] = alias_arg;
3276 setgroups(group_count, group_list);
3277 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3279 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3280 (argv[1] == NULL)? US"" : argv[1]);
3282 execv(CS argv[0], (char *const *)argv);
3283 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3288 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3293 /* If an action on specific messages is requested, or if a daemon or queue
3294 runner is being started, we need to know if Exim was called by an admin user.
3295 This is the case if the real user is root or exim, or if the real group is
3296 exim, or if one of the supplementary groups is exim or a group listed in
3297 admin_groups. We don't fail all message actions immediately if not admin_user,
3298 since some actions can be performed by non-admin users. Instead, set admin_user
3299 for later interrogation. */
3301 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3307 for (i = 0; i < group_count; i++)
3309 if (group_list[i] == exim_gid) admin_user = TRUE;
3310 else if (admin_groups != NULL)
3312 for (j = 1; j <= (int)(admin_groups[0]); j++)
3313 if (admin_groups[j] == group_list[i])
3314 { admin_user = TRUE; break; }
3316 if (admin_user) break;
3320 /* Another group of privileged users are the trusted users. These are root,
3321 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3322 are permitted to specify sender_addresses with -f on the command line, and
3323 other message parameters as well. */
3325 if (real_uid == root_uid || real_uid == exim_uid)
3326 trusted_caller = TRUE;
3331 if (trusted_users != NULL)
3333 for (i = 1; i <= (int)(trusted_users[0]); i++)
3334 if (trusted_users[i] == real_uid)
3335 { trusted_caller = TRUE; break; }
3338 if (!trusted_caller && trusted_groups != NULL)
3340 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3342 if (trusted_groups[i] == real_gid)
3343 trusted_caller = TRUE;
3344 else for (j = 0; j < group_count; j++)
3346 if (trusted_groups[i] == group_list[j])
3347 { trusted_caller = TRUE; break; }
3349 if (trusted_caller) break;
3354 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3355 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3357 /* Only an admin user may start the daemon or force a queue run in the default
3358 configuration, but the queue run restriction can be relaxed. Only an admin
3359 user may request that a message be returned to its sender forthwith. Only an
3360 admin user may specify a debug level greater than D_v (because it might show
3361 passwords, etc. in lookup queries). Only an admin user may request a queue
3366 BOOL debugset = (debug_selector & ~D_v) != 0;
3367 if (deliver_give_up || daemon_listen ||
3368 (count_queue && queue_list_requires_admin) ||
3369 (list_queue && queue_list_requires_admin) ||
3370 (queue_interval >= 0 && prod_requires_admin) ||
3371 (debugset && !running_in_test_harness))
3373 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3378 /* If the real user is not root or the exim uid, the argument for passing
3379 in an open TCP/IP connection for another message is not permitted, nor is
3380 running with the -N option for any delivery action, unless this call to exim is
3381 one that supplied an input message, or we are using a patched exim for
3382 regression testing. */
3384 if (real_uid != root_uid && real_uid != exim_uid &&
3385 (continue_hostname != NULL ||
3387 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3388 )) && !running_in_test_harness)
3390 fprintf(stderr, "exim: Permission denied\n");
3391 return EXIT_FAILURE;
3394 /* If the caller is not trusted, certain arguments are ignored when running for
3395 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf). Note
3396 that authority for performing certain actions on messages is tested in the
3397 queue_action() function. */
3399 if (!trusted_caller && !checking && filter_test == NULL)
3401 sender_host_name = sender_host_address = interface_address =
3402 sender_ident = received_protocol = NULL;
3403 sender_host_port = interface_port = 0;
3404 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3407 /* If a sender host address is set, extract the optional port number off the
3408 end of it and check its syntax. Do the same thing for the interface address.
3409 Exim exits if the syntax is bad. */
3413 if (sender_host_address != NULL)
3414 sender_host_port = check_port(sender_host_address);
3415 if (interface_address != NULL)
3416 interface_port = check_port(interface_address);
3419 /* If an SMTP message is being received check to see if the standard input is a
3420 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3421 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3426 union sockaddr_46 inetd_sock;
3427 SOCKLEN_T size = sizeof(inetd_sock);
3428 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3430 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3431 if (family == AF_INET || family == AF_INET6)
3433 union sockaddr_46 interface_sock;
3434 size = sizeof(interface_sock);
3436 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3437 interface_address = host_ntoa(-1, &interface_sock, NULL,
3440 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3442 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3445 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3446 NULL, &sender_host_port);
3447 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3448 "inetd is not supported when mua_wrapper is set");
3453 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3454 return EXIT_FAILURE;
3460 /* If the load average is going to be needed while receiving a message, get it
3461 now for those OS that require the first call to os_getloadavg() to be done as
3462 root. There will be further calls later for each message received. */
3464 #ifdef LOAD_AVG_NEEDS_ROOT
3465 if (receiving_message &&
3466 (queue_only_load >= 0 ||
3467 (is_inetd && smtp_load_reserve >= 0)
3470 load_average = os_getloadavg();
3474 /* The queue_only configuration option can be overridden by -odx on the command
3475 line, except that if queue_only_override is false, queue_only cannot be unset
3476 from the command line. */
3478 if (queue_only_set && (queue_only_override || arg_queue_only))
3479 queue_only = arg_queue_only;
3481 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3484 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3485 if (arg_smtp_receive_timeout >= 0)
3486 smtp_receive_timeout = arg_smtp_receive_timeout;
3488 /* If Exim was started with root privilege, unless we have already removed the
3489 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3490 except when starting the daemon or doing some kind of delivery or address
3491 testing (-bt). These are the only cases when root need to be retained. We run
3492 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3493 retained only for starting the daemon. */
3495 if (!unprivileged && /* originally had root AND */
3496 !removed_privilege && /* still got root AND */
3497 !daemon_listen && /* not starting the daemon */
3498 queue_interval <= 0 && /* (either kind of daemon) */
3500 deliver_drop_privilege || /* requested unprivileged */
3502 queue_interval < 0 && /* not running the queue */
3503 (msg_action_arg < 0 || /* and */
3504 msg_action != MSG_DELIVER) && /* not delivering and */
3505 (!checking || !address_test_mode) /* not address checking */
3509 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3512 /* When we are retaining a privileged uid, we still change to the exim gid. */
3514 else setgid(exim_gid);
3516 /* Handle a request to list the delivery queue */
3520 set_process_info("listing the queue");
3521 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3525 /* Handle a request to count the delivery queue */
3529 set_process_info("counting the queue");
3534 /* Handle actions on specific messages, except for the force delivery action,
3535 which is done below. Some actions take a whole list of message ids, which
3536 are known to continue up to the end of the arguments. Others take a single
3537 message id and then operate on the recipients list. */
3539 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3541 int yield = EXIT_SUCCESS;
3542 set_process_info("acting on specified messages");
3544 if (!one_msg_action)
3546 for (i = msg_action_arg; i < argc; i++)
3547 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3548 yield = EXIT_FAILURE;
3551 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3552 recipients_arg)) yield = EXIT_FAILURE;
3556 /* All the modes below here require the remaining configuration sections
3557 to be read, except that we can skip over the ACL setting when delivering
3558 specific messages, or doing a queue run. (For various testing cases we could
3559 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3562 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3564 /* The configuration data will have been read into POOL_PERM because we won't
3565 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3566 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3567 configuration were read into POOL_MAIN, because we don't do any resets till
3568 later on. However, it seems right, and it does ensure that both pools get used.
3571 store_pool = POOL_MAIN;
3573 /* Handle the -brt option. This is for checking out retry configurations.
3574 The next three arguments are a domain name or a complete address, and
3575 optionally two error numbers. All it does is to call the function that
3576 scans the retry configuration data. */
3578 if (test_retry_arg >= 0)
3580 retry_config *yield;
3581 int basic_errno = 0;
3585 if (test_retry_arg >= argc)
3587 printf("-brt needs a domain or address argument\n");
3588 exim_exit(EXIT_FAILURE);
3590 s1 = argv[test_retry_arg++];
3593 /* If the first argument contains no @ and no . it might be a local user
3594 or it might be a single-component name. Treat as a domain. */
3596 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3598 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3599 "being \ntreated as a one-component domain, not as a local part.\n\n",
3603 /* There may be an optional second domain arg. */
3605 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3606 s2 = argv[test_retry_arg++];
3608 /* The final arg is an error name */
3610 if (test_retry_arg < argc)
3612 uschar *ss = argv[test_retry_arg];
3614 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3617 printf("%s\n", CS error);
3618 return EXIT_FAILURE;
3621 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3622 an error is for matching codes to the decade. Turn them into a real error
3623 code, off the decade. */
3625 if (basic_errno == ERRNO_RCPT4XX)
3627 int code = (more_errno >> 8) & 255;
3629 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3630 else if (code > 100)
3631 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3635 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3636 if (yield == NULL) printf("No retry information found\n"); else
3639 more_errno = yield->more_errno;
3640 printf("Retry rule: %s ", yield->pattern);
3642 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3644 printf("quota%s%s ",
3645 (more_errno > 0)? "_" : "",
3646 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3648 else if (yield->basic_errno == ECONNREFUSED)
3650 printf("refused%s%s ",
3651 (more_errno > 0)? "_" : "",
3652 (more_errno == 'M')? "MX" :
3653 (more_errno == 'A')? "A" : "");
3655 else if (yield->basic_errno == ETIMEDOUT)
3658 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3660 if (more_errno != 0) printf("_%s",
3661 (more_errno == 'M')? "MX" : "A");
3664 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3665 printf("auth_failed ");
3668 for (r = yield->rules; r != NULL; r = r->next)
3670 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3671 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3677 printf(",%d.", x/1000);
3691 exim_exit(EXIT_SUCCESS);
3694 /* Handle a request to list one or more configuration options */
3698 set_process_info("listing variables");
3699 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3700 else for (i = recipients_arg; i < argc; i++)
3703 (Ustrcmp(argv[i], "router") == 0 ||
3704 Ustrcmp(argv[i], "transport") == 0 ||
3705 Ustrcmp(argv[i], "authenticator") == 0))
3707 readconf_print(argv[i+1], argv[i]);
3710 else readconf_print(argv[i], NULL);
3712 exim_exit(EXIT_SUCCESS);
3716 /* Handle a request to deliver one or more messages that are already on the
3717 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3718 is typically used for a small number when prodding by hand (when the option
3719 forced_delivery will be set) or when re-execing to regain root privilege.
3720 Each message delivery must happen in a separate process, so we fork a process
3721 for each one, and run them sequentially so that debugging output doesn't get
3722 intertwined, and to avoid spawning too many processes if a long list is given.
3723 However, don't fork for the last one; this saves a process in the common case
3724 when Exim is called to deliver just one message. */
3726 if (msg_action_arg > 0)
3728 if (prod_requires_admin && !admin_user)
3730 fprintf(stderr, "exim: Permission denied\n");
3731 exim_exit(EXIT_FAILURE);
3733 set_process_info("delivering specified messages");
3734 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3735 for (i = msg_action_arg; i < argc; i++)
3740 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3741 else if ((pid = fork()) == 0)
3743 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3744 _exit(EXIT_SUCCESS);
3748 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3750 exim_exit(EXIT_FAILURE);
3754 exim_exit(EXIT_SUCCESS);
3758 /* If only a single queue run is requested, without SMTP listening, we can just
3759 turn into a queue runner, with an optional starting message id. */
3761 if (queue_interval == 0 && !daemon_listen)
3763 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3764 (start_queue_run_id == NULL)? US"" : US" starting at ",
3765 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3766 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3767 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3768 set_process_info("running the queue (single queue run)");
3769 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3770 exim_exit(EXIT_SUCCESS);
3774 /* Find the login name of the real user running this process. This is always
3775 needed when receiving a message, because it is written into the spool file. It
3776 may also be used to construct a from: or a sender: header, and in this case we
3777 need the user's full name as well, so save a copy of it, checked for RFC822
3778 syntax and munged if necessary, if it hasn't previously been set by the -F
3779 argument. We may try to get the passwd entry more than once, in case NIS or
3780 other delays are in evidence. Save the home directory for use in filter testing
3785 if ((pw = getpwuid(real_uid)) != NULL)
3787 originator_login = string_copy(US pw->pw_name);
3788 originator_home = string_copy(US pw->pw_dir);
3790 /* If user name has not been set by -F, set it from the passwd entry
3791 unless -f has been used to set the sender address by a trusted user. */
3793 if (originator_name == NULL)
3795 if (sender_address == NULL ||
3796 (!trusted_caller && filter_test == NULL))
3798 uschar *name = US pw->pw_gecos;
3799 uschar *amp = Ustrchr(name, '&');
3802 /* Most Unix specify that a '&' character in the gecos field is
3803 replaced by a copy of the login name, and some even specify that
3804 the first character should be upper cased, so that's what we do. */
3809 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3810 amp - name, name, &loffset, originator_login, amp + 1);
3811 buffer[loffset] = toupper(buffer[loffset]);
3815 /* If a pattern for matching the gecos field was supplied, apply
3816 it and then expand the name string. */
3818 if (gecos_pattern != NULL && gecos_name != NULL)
3821 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3823 if (regex_match_and_setup(re, name, 0, -1))
3825 uschar *new_name = expand_string(gecos_name);
3827 if (new_name != NULL)
3829 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3830 "gecos field \"%s\"\n", new_name, name);
3833 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3834 "\"%s\": %s\n", gecos_name, expand_string_message);
3836 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3837 "gecos field \"%s\"\n", gecos_pattern, name);
3838 store_free((void *)re);
3840 originator_name = string_copy(name);
3843 /* A trusted caller has used -f but not -F */
3845 else originator_name = US"";
3848 /* Break the retry loop */
3853 if (++i > finduser_retries) break;
3857 /* If we cannot get a user login, log the incident and give up, unless the
3858 configuration specifies something to use. When running in the test harness,
3859 any setting of unknown_login overrides the actual login name. */
3861 if (originator_login == NULL || running_in_test_harness)
3863 if (unknown_login != NULL)
3865 originator_login = expand_string(unknown_login);
3866 if (originator_name == NULL && unknown_username != NULL)
3867 originator_name = expand_string(unknown_username);
3868 if (originator_name == NULL) originator_name = US"";
3870 if (originator_login == NULL)
3871 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3875 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3878 originator_name = string_copy(parse_fix_phrase(originator_name,
3879 Ustrlen(originator_name), big_buffer, big_buffer_size));
3881 /* If a message is created by this call of Exim, the uid/gid of its originator
3882 are those of the caller. These values are overridden if an existing message is
3883 read in from the spool. */
3885 originator_uid = real_uid;
3886 originator_gid = real_gid;
3888 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3889 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3891 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3892 returns. We leave this till here so that the originator_ fields are available
3893 for incoming messages via the daemon. */
3895 if (daemon_listen || queue_interval > 0)
3897 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3898 "run when mua_wrapper is set");
3902 /* If the sender ident has not been set (by a trusted caller) set it to
3903 the caller. This will get overwritten below for an inetd call. If a trusted
3904 caller has set it empty, unset it. */
3906 if (sender_ident == NULL) sender_ident = originator_login;
3907 else if (sender_ident[0] == 0) sender_ident = NULL;
3909 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3910 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3911 originator_* variables set. */
3913 if (test_rewrite_arg >= 0)
3915 really_exim = FALSE;
3916 if (test_rewrite_arg >= argc)
3918 printf("-brw needs an address argument\n");
3919 exim_exit(EXIT_FAILURE);
3921 rewrite_test(argv[test_rewrite_arg]);
3922 exim_exit(EXIT_SUCCESS);
3925 /* A locally-supplied message is considered to be coming from a local user
3926 unless a trusted caller supplies a sender address with -f, or is passing in the
3927 message via SMTP (inetd invocation or otherwise). */
3929 if ((sender_address == NULL && !smtp_input) ||
3930 (!trusted_caller && filter_test == NULL))
3932 sender_local = TRUE;
3934 /* A trusted caller can supply authenticated_sender and authenticated_id
3935 via -oMas and -oMai and if so, they will already be set. */
3937 if (authenticated_sender == NULL)
3938 authenticated_sender = string_sprintf("%s@%s", originator_login,
3939 qualify_domain_sender);
3940 if (authenticated_id == NULL) authenticated_id = originator_login;
3943 /* Trusted callers are always permitted to specify the sender address.
3944 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3945 is specified is the empty address. However, if a trusted caller does not
3946 specify a sender address for SMTP input, we leave sender_address unset. This
3947 causes the MAIL commands to be honoured. */
3949 if ((!smtp_input && sender_address == NULL) ||
3950 !receive_check_set_sender(sender_address))
3952 /* Either the caller is not permitted to set a general sender, or this is
3953 non-SMTP input and the trusted caller has not set a sender. If there is no
3954 sender, or if a sender other than <> is set, override with the originator's
3955 login (which will get qualified below), except when checking things. */
3957 if (sender_address == NULL /* No sender_address set */
3959 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3960 !checking && /* Not running tests, AND */
3961 filter_test == NULL)) /* Not testing a filter */
3963 sender_address = originator_login;
3964 sender_address_forced = FALSE;
3965 sender_address_domain = 0;
3969 /* Remember whether an untrusted caller set the sender address */
3971 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3973 /* Ensure that the sender address is fully qualified unless it is the empty
3974 address, which indicates an error message, or doesn't exist (root caller, smtp
3975 interface, no -f argument). */
3977 if (sender_address != NULL && sender_address[0] != 0 &&
3978 sender_address_domain == 0)
3979 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
3980 qualify_domain_sender);
3982 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
3984 /* Handle a request to verify a list of addresses, or test them for delivery.
3985 This must follow the setting of the sender address, since routers can be
3986 predicated upon the sender. If no arguments are given, read addresses from
3987 stdin. Set debug_level to at least D_v to get full output for address testing.
3990 if (verify_address_mode || address_test_mode)
3993 int flags = vopt_qualify;
3995 if (verify_address_mode)
3997 if (!verify_as_sender) flags |= vopt_is_recipient;
3998 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4003 flags |= vopt_is_recipient;
4004 debug_selector |= D_v;
4005 debug_file = stderr;
4006 debug_fd = fileno(debug_file);
4007 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4010 if (recipients_arg < argc)
4012 while (recipients_arg < argc)
4014 uschar *s = argv[recipients_arg++];
4017 BOOL finished = FALSE;
4018 uschar *ss = parse_find_address_end(s, FALSE);
4019 if (*ss == ',') *ss = 0; else finished = TRUE;
4020 test_address(s, flags, &exit_value);
4023 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4030 uschar *s = get_stdinput(NULL, NULL);
4031 if (s == NULL) break;
4032 test_address(s, flags, &exit_value);
4036 exim_exit(exit_value);
4039 /* Handle expansion checking */
4043 if (recipients_arg < argc)
4045 while (recipients_arg < argc)
4047 uschar *s = argv[recipients_arg++];
4048 uschar *ss = expand_string(s);
4050 printf ("Failed: %s\n", expand_string_message);
4051 else printf("%s\n", CS ss);
4059 char *(*fn_readline)(char *) = NULL;
4060 char *(*fn_addhist)(char *) = NULL;
4063 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4069 uschar *source = get_stdinput(fn_readline, fn_addhist);
4070 if (source == NULL) break;
4071 ss = expand_string(source);
4073 printf ("Failed: %s\n", expand_string_message);
4074 else printf("%s\n", CS ss);
4078 if (dlhandle != NULL) dlclose(dlhandle);
4082 exim_exit(EXIT_SUCCESS);
4086 /* The active host name is normally the primary host name, but it can be varied
4087 for hosts that want to play several parts at once. We need to ensure that it is
4088 set for host checking, and for receiving messages. */
4090 smtp_active_hostname = primary_hostname;
4091 if (raw_active_hostname != NULL)
4093 uschar *nah = expand_string(raw_active_hostname);
4096 if (!expand_string_forcedfail)
4097 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4098 "(smtp_active_hostname): %s", raw_active_hostname,
4099 expand_string_message);
4101 else if (nah[0] != 0) smtp_active_hostname = nah;
4104 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4105 given IP address so that the blocking and relay configuration can be tested. An
4106 RFC 1413 call is made only if we are running in the test harness and an
4107 incoming interface and both ports are specified, because there is no TCP/IP
4108 call to find the ident for. */
4115 sender_ident = NULL;
4116 if (running_in_test_harness && sender_host_port != 0 &&
4117 interface_address != NULL && interface_port != 0)
4118 verify_get_ident(1413);
4120 /* In case the given address is a non-canonical IPv6 address, canonicize
4121 it. The code works for both IPv4 and IPv6, as it happens. */
4123 size = host_aton(sender_host_address, x);
4124 sender_host_address = store_get(48); /* large enough for full IPv6 */
4125 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4127 /* Now set up for testing */
4129 host_build_sender_fullhost();
4133 sender_local = FALSE;
4134 sender_host_notsocket = TRUE;
4135 debug_file = stderr;
4136 debug_fd = fileno(debug_file);
4137 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4138 "**** but without any ident (RFC 1413) callback.\n"
4139 "**** This is not for real!\n\n",
4140 sender_host_address);
4142 if (verify_check_host(&hosts_connection_nolog) == OK)
4143 log_write_selector &= ~L_smtp_connection;
4144 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4146 if (smtp_start_session())
4148 reset_point = store_get(0);
4151 store_reset(reset_point);
4152 if (smtp_setup_msg() <= 0) break;
4153 if (!receive_msg(FALSE)) break;
4156 exim_exit(EXIT_SUCCESS);
4160 /* Arrange for message reception if recipients or SMTP were specified;
4161 otherwise complain unless a version print (-bV) happened or this is a filter
4162 verification test. In the former case, show the configuration file name. */
4164 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4166 if (version_printed)
4168 printf("Configuration file is %s\n", config_main_filename);
4169 return EXIT_SUCCESS;
4171 if (filter_test == NULL)
4174 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4175 "not directly from a shell command line. Options and/or arguments control\n"
4176 "what it does when called. For a list of options, see the Exim documentation.\n");
4177 return EXIT_FAILURE;
4182 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4183 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4184 that we are not called from inetd, because that is rejected above. The
4185 following configuration settings are forced here:
4187 (1) Synchronous delivery (-odi)
4188 (2) Errors to stderr (-oep == -oeq)
4189 (3) No parallel remote delivery
4190 (4) Unprivileged delivery
4192 We don't force overall queueing options because there are several of them;
4193 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4194 to override any SMTP queueing. */
4198 synchronous_delivery = TRUE;
4199 arg_error_handling = ERRORS_STDERR;
4200 remote_max_parallel = 1;
4201 deliver_drop_privilege = TRUE;
4203 queue_smtp_domains = NULL;
4207 /* Prepare to accept one or more new messages on the standard input. When a
4208 message has been read, its id is returned in message_id[]. If doing immediate
4209 delivery, we fork a delivery process for each received message, except for the
4210 last one, where we can save a process switch.
4212 It is only in non-smtp mode that error_handling is allowed to be changed from
4213 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4214 sendmail error modes other than -oem ever actually used? Later: yes.) */
4216 if (!smtp_input) error_handling = arg_error_handling;
4218 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4219 logging being sent down the socket and make an identd call to get the
4225 exim_nullstd(); /* Re-open to /dev/null */
4226 verify_get_ident(IDENT_PORT);
4227 host_build_sender_fullhost();
4228 set_process_info("handling incoming connection from %s via inetd",
4232 /* If the sender host address has been set, build sender_fullhost if it hasn't
4233 already been done (which it will have been for inetd). This caters for the
4234 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4235 so that the test for IP options is skipped for -bs input. */
4237 if (sender_host_address != NULL && sender_fullhost == NULL)
4239 host_build_sender_fullhost();
4240 set_process_info("handling incoming connection from %s via -oMa",
4242 sender_host_notsocket = TRUE;
4245 /* Otherwise, set the sender host as unknown except for inetd calls. This
4246 prevents host checking in the case of -bs not from inetd and also for -bS. */
4248 else if (!is_inetd) sender_host_unknown = TRUE;
4250 /* If stdout does not exist, then dup stdin to stdout. This can happen
4251 if exim is started from inetd. In this case fd 0 will be set to the socket,
4252 but fd 1 will not be set. This also happens for passed SMTP channels. */
4254 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4256 /* Set up the incoming protocol name and the state of the program. Root
4257 is allowed to force received protocol via the -oMr option above, and if we are
4258 in a non-local SMTP state it means we have come via inetd and the process info
4259 has already been set up. We don't set received_protocol here for smtp input,
4260 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4264 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4269 if (received_protocol == NULL)
4270 received_protocol = string_sprintf("local%s", called_as);
4271 set_process_info("accepting a local non-SMTP message from <%s>",
4275 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4279 local_queue_only = queue_only;
4281 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4282 the spool if so configured. On failure, we must not attempt to send an error
4283 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4284 error code is given.) */
4286 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4288 fprintf(stderr, "exim: insufficient disk space\n");
4289 return EXIT_FAILURE;
4292 /* If this is smtp input of any kind, handle the start of the SMTP
4299 if (verify_check_host(&hosts_connection_nolog) == OK)
4300 log_write_selector &= ~L_smtp_connection;
4301 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4302 if (!smtp_start_session())
4305 exim_exit(EXIT_SUCCESS);
4309 /* Otherwise, set up the input size limit here */
4313 thismessage_size_limit = expand_string_integer(message_size_limit);
4314 if (thismessage_size_limit < 0)
4316 if (thismessage_size_limit == -1)
4317 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4318 "message_size_limit: %s", expand_string_message);
4320 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4321 "message_size_limit: %s", expand_string_message);
4325 /* Loop for several messages when reading SMTP input. If we fork any child
4326 processes, we don't want to wait for them unless synchronous delivery is
4327 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4328 same as SIG_DFL, despite the fact that documentation often lists the default as
4329 "ignore". This is a confusing area. This is what I know:
4331 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4332 processes that complete simply to go away without ever becoming defunct. You
4333 can't then wait for them - but we don't want to wait for them in the
4334 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4335 happen for all OS (e.g. *BSD is different).
4337 But that's not the end of the story. Some (many? all?) systems have the
4338 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4339 has by default, so it seems that the difference is merely one of default
4340 (compare restarting vs non-restarting signals).
4342 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4343 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4344 of the loop below. Paranoia rules.
4346 February 2003: That's *still* not the end of the story. There are now versions
4347 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4348 process then calls waitpid(), a grumble is written to the system log, because
4349 this is logically inconsistent. In other words, it doesn't like the paranoia.
4350 As a consequenc of this, the waitpid() below is now excluded if we are sure
4351 that SIG_IGN works. */
4353 if (!synchronous_delivery)
4356 struct sigaction act;
4357 act.sa_handler = SIG_IGN;
4358 sigemptyset(&(act.sa_mask));
4359 act.sa_flags = SA_NOCLDWAIT;
4360 sigaction(SIGCHLD, &act, NULL);
4362 signal(SIGCHLD, SIG_IGN);
4366 /* Save the current store pool point, for resetting at the start of
4367 each message, and save the real sender address, if any. */
4369 reset_point = store_get(0);
4370 real_sender_address = sender_address;
4372 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4373 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4378 store_reset(reset_point);
4381 /* In the SMTP case, we have to handle the initial SMTP input and build the
4382 recipients list, before calling receive_msg() to read the message proper.
4383 Whatever sender address is actually given in the SMTP transaction is
4384 actually ignored for local senders - we use the actual sender, which is
4385 normally either the underlying user running this process or a -f argument
4386 provided by a trusted caller. It is saved in real_sender_address.
4388 However, if this value is NULL, we are dealing with a trusted caller when
4389 -f was not used; in this case, the SMTP sender is allowed to stand.
4391 Also, if untrusted_set_sender is set, we permit sender addresses that match
4392 anything in its list.
4394 The variable raw_sender_address holds the sender address before rewriting. */
4399 if ((rc = smtp_setup_msg()) > 0)
4401 if (real_sender_address != NULL &&
4402 !receive_check_set_sender(sender_address))
4404 sender_address = raw_sender = real_sender_address;
4405 sender_address_unrewritten = NULL;
4407 more = receive_msg(extract_recipients);
4408 if (message_id[0] == 0)
4411 exim_exit(EXIT_FAILURE);
4414 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4417 /* In the non-SMTP case, we have all the information from the command
4418 line, but must process it in case it is in the more general RFC822
4419 format, and in any case, to detect syntax errors. Also, it appears that
4420 the use of comma-separated lists as single arguments is common, so we
4421 had better support them. */
4427 int count = argc - recipients_arg;
4428 uschar **list = argv + recipients_arg;
4430 /* These options cannot be changed dynamically for non-SMTP messages */
4432 active_local_sender_retain = local_sender_retain;
4433 active_local_from_check = local_from_check;
4435 /* Save before any rewriting */
4437 raw_sender = string_copy(sender_address);
4439 /* Loop for each argument */
4441 for (i = 0; i < count; i++)
4443 int start, end, domain;
4445 uschar *s = list[i];
4447 /* Loop for each comma-separated address */
4451 BOOL finished = FALSE;
4453 uschar *ss = parse_find_address_end(s, FALSE);
4455 if (*ss == ',') *ss = 0; else finished = TRUE;
4457 /* Check max recipients - if -t was used, these aren't recipients */
4459 if (recipients_max > 0 && ++rcount > recipients_max &&
4460 !extract_recipients)
4462 if (error_handling == ERRORS_STDERR)
4464 fprintf(stderr, "exim: too many recipients\n");
4465 exim_exit(EXIT_FAILURE);
4470 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4471 errors_sender_rc : EXIT_FAILURE;
4476 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4478 if (domain == 0 && !allow_unqualified_recipient)
4481 errmess = US"unqualified recipient address not allowed";
4484 if (recipient == NULL)
4486 if (error_handling == ERRORS_STDERR)
4488 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4489 string_printing(list[i]), errmess);
4490 exim_exit(EXIT_FAILURE);
4496 eblock.text1 = string_printing(list[i]);
4497 eblock.text2 = errmess;
4499 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4500 errors_sender_rc : EXIT_FAILURE;
4504 receive_add_recipient(recipient, -1);
4507 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4511 /* Show the recipients when debugging */
4516 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4517 if (recipients_list != NULL)
4519 debug_printf("Recipients:\n");
4520 for (i = 0; i < recipients_count; i++)
4521 debug_printf(" %s\n", recipients_list[i].address);
4525 /* Read the data for the message. If filter_test is true, this will
4526 just read the headers for the message, and not write anything onto
4529 message_ended = END_NOTENDED;
4530 more = receive_msg(extract_recipients);
4532 /* more is always FALSE here (not SMTP message) when reading a message
4533 for real; when reading the headers of a message for filter testing,
4534 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4536 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4537 } /* Non-SMTP message reception */
4539 /* If this is a filter testing run, there are headers in store, but
4540 no message on the spool. Run the filtering code in testing mode, setting
4541 the domain to the qualify domain and the local part to the current user,
4542 unless they have been set by options. The prefix and suffix are left unset
4543 unless specified. The the return path is set to to the sender unless it has
4544 already been set from a return-path header in the message. */
4546 if (filter_test != NULL)
4548 deliver_domain = (ftest_domain != NULL)?
4549 ftest_domain : qualify_domain_recipient;
4550 deliver_domain_orig = deliver_domain;
4551 deliver_localpart = (ftest_localpart != NULL)?
4552 ftest_localpart : originator_login;
4553 deliver_localpart_orig = deliver_localpart;
4554 deliver_localpart_prefix = ftest_prefix;
4555 deliver_localpart_suffix = ftest_suffix;
4556 deliver_home = originator_home;
4558 if (return_path == NULL)
4560 printf("Return-path copied from sender\n");
4561 return_path = string_copy(sender_address);
4565 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4567 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4569 receive_add_recipient(
4570 string_sprintf("%s%s%s@%s",
4571 (ftest_prefix == NULL)? US"" : ftest_prefix,
4573 (ftest_suffix == NULL)? US"" : ftest_suffix,
4574 deliver_domain), -1);
4576 printf("Recipient = %s\n", recipients_list[0].address);
4577 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4578 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4580 chdir("/"); /* Get away from wherever the user is running this from */
4581 exim_exit(filter_runtest(filter_fd, ftest_system, more)?
4582 EXIT_SUCCESS : EXIT_FAILURE);
4585 /* Else act on the result of message reception. We should not get here unless
4586 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4587 TRUE. If it is not, check on the number of messages received in this
4588 connection. If that's OK and queue_only_load is set, check that the load
4589 average is below it. If it is not, set local_queue_only TRUE. Note that it
4590 then remains this way for any subsequent messages on the same SMTP connection.
4591 This is a deliberate choice; even though the load average may fall, it
4592 doesn't seem right to deliver later messages on the same call when not
4593 delivering earlier ones. */
4595 if (!local_queue_only)
4597 if (smtp_accept_queue_per_connection > 0 &&
4598 receive_messagecount > smtp_accept_queue_per_connection)
4600 local_queue_only = TRUE;
4601 queue_only_reason = 2;
4603 else if (queue_only_load >= 0)
4605 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4606 if (local_queue_only) queue_only_reason = 3;
4610 /* If running as an MUA wrapper, all queueing options and freezing options
4614 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4616 /* Log the queueing here, when it will get a message id attached, but
4617 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4620 if (local_queue_only) switch(queue_only_reason)
4623 log_write(L_delay_delivery,
4624 LOG_MAIN, "no immediate delivery: more than %d messages "
4625 "received in one connection", smtp_accept_queue_per_connection);
4629 log_write(L_delay_delivery,
4630 LOG_MAIN, "no immediate delivery: load average %.2f",
4631 (double)load_average/1000.0);
4635 /* Else do the delivery unless the ACL or local_scan() called for queue only
4636 or froze the message. Always deliver in a separate process. A fork failure is
4637 not a disaster, as the delivery will eventually happen on a subsequent queue
4638 run. The search cache must be tidied before the fork, as the parent will
4639 do it before exiting. The child will trigger a lookup failure and
4640 thereby defer the delivery if it tries to use (for example) a cached ldap
4641 connection that the parent has called unbind on. */
4643 else if (!queue_only_policy && !deliver_freeze)
4648 if ((pid = fork()) == 0)
4651 close_unwanted(); /* Close unwanted file descriptors and TLS */
4652 exim_nullstd(); /* Ensure std{in,out,err} exist */
4654 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4655 mode, deliver_drop_privilege is forced TRUE). */
4657 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4659 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4661 /* Control does not return here. */
4664 /* No need to re-exec */
4666 rc = deliver_message(message_id, FALSE, FALSE);
4668 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4669 EXIT_SUCCESS : EXIT_FAILURE);
4674 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4675 "process: %s", strerror(errno));
4678 /* In the parent, wait if synchronous delivery is required. This will
4679 always be the case in MUA wrapper mode. */
4681 else if (synchronous_delivery)
4684 while (wait(&status) != pid);
4685 if ((status & 0x00ff) != 0)
4686 log_write(0, LOG_MAIN|LOG_PANIC,
4687 "process %d crashed with signal %d while delivering %s",
4688 (int)pid, status & 0x00ff, message_id);
4689 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4693 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4694 automatically reaps children (see comments above the loop), clear away any
4695 finished subprocesses here, in case there are lots of messages coming in
4696 from the same source. */
4698 #ifndef SIG_IGN_WORKS
4699 while (waitpid(-1, NULL, WNOHANG) > 0);
4703 exim_exit(EXIT_SUCCESS); /* Never returns */
4704 return 0; /* To stop compiler warning */