1 /* $Cambridge: exim/src/src/exim.c,v 1.7 2004/11/04 12:19:48 ph10 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");
844 fprintf(f, "Lookups:");
845 #ifdef LOOKUP_LSEARCH
846 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
852 fprintf(f, " dbm dbmnz");
855 fprintf(f, " dnsdb");
857 #ifdef LOOKUP_DSEARCH
858 fprintf(f, " dsearch");
861 fprintf(f, " ibase");
864 fprintf(f, " ldap ldapdn ldapm");
867 fprintf(f, " mysql");
870 fprintf(f, " nis nis0");
872 #ifdef LOOKUP_NISPLUS
873 fprintf(f, " nisplus");
876 fprintf(f, " oracle");
879 fprintf(f, " passwd");
882 fprintf(f, " pgsql");
885 fprintf(f, " testdb");
888 fprintf(f, " whoson");
892 fprintf(f, "Authenticators:");
894 fprintf(f, " cram_md5");
896 #ifdef AUTH_CYRUS_SASL
897 fprintf(f, " cyrus_sasl");
899 #ifdef AUTH_PLAINTEXT
900 fprintf(f, " plaintext");
907 fprintf(f, "Routers:");
909 fprintf(f, " accept");
911 #ifdef ROUTER_DNSLOOKUP
912 fprintf(f, " dnslookup");
914 #ifdef ROUTER_IPLITERAL
915 fprintf(f, " ipliteral");
917 #ifdef ROUTER_IPLOOKUP
918 fprintf(f, " iplookup");
920 #ifdef ROUTER_MANUALROUTE
921 fprintf(f, " manualroute");
923 #ifdef ROUTER_QUERYPROGRAM
924 fprintf(f, " queryprogram");
926 #ifdef ROUTER_REDIRECT
927 fprintf(f, " redirect");
931 fprintf(f, "Transports:");
932 #ifdef TRANSPORT_APPENDFILE
933 fprintf(f, " appendfile");
934 #ifdef SUPPORT_MAILDIR
935 fprintf(f, "/maildir");
937 #ifdef SUPPORT_MAILSTORE
938 fprintf(f, "/mailstore");
944 #ifdef TRANSPORT_AUTOREPLY
945 fprintf(f, " autoreply");
947 #ifdef TRANSPORT_LMTP
950 #ifdef TRANSPORT_PIPE
953 #ifdef TRANSPORT_SMTP
958 if (fixed_never_users[0] > 0)
961 fprintf(f, "Fixed never_users: ");
962 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
963 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
964 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
971 /*************************************************
972 * Quote a local part *
973 *************************************************/
975 /* This function is used when a sender address or a From: or Sender: header
976 line is being created from the caller's login, or from an authenticated_id. It
977 applies appropriate quoting rules for a local part.
979 Argument: the local part
980 Returns: the local part, quoted if necessary
984 local_part_quote(uschar *lpart)
986 BOOL needs_quote = FALSE;
991 for (t = lpart; !needs_quote && *t != 0; t++)
993 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
994 (*t != '.' || t == lpart || t[1] == 0);
997 if (!needs_quote) return lpart;
1000 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1004 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1007 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1010 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1011 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1012 yield = string_cat(yield, &size, &ptr, nq, 1);
1016 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1024 /*************************************************
1025 * Load readline() functions *
1026 *************************************************/
1028 /* This function is called from testing executions that read data from stdin,
1029 but only when running as the calling user. Currently, only -be does this. The
1030 function loads the readline() function library and passes back the functions.
1031 On some systems, it needs the curses library, so load that too, but try without
1032 it if loading fails. All this functionality has to be requested at build time.
1035 fn_readline_ptr pointer to where to put the readline pointer
1036 fn_addhist_ptr pointer to where to put the addhistory function
1038 Returns: the dlopen handle or NULL on failure
1042 set_readline(char * (**fn_readline_ptr)(char *),
1043 char * (**fn_addhist_ptr)(char *))
1046 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1048 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1049 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1051 if (dlhandle != NULL)
1053 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1054 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1058 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1067 /*************************************************
1068 * Get a line from stdin for testing things *
1069 *************************************************/
1071 /* This function is called when running tests that can take a number of lines
1072 of input (for example, -be and -bt). It handles continuations and trailing
1073 spaces. And prompting and a blank line output on eof. If readline() is in use,
1074 the arguments are non-NULL and provide the relevant functions.
1077 fn_readline readline function or NULL
1078 fn_addhist addhist function or NULL
1080 Returns: pointer to dynamic memory, or NULL at end of file
1084 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1089 uschar *yield = NULL;
1091 if (fn_readline == NULL) printf("> ");
1095 uschar buffer[1024];
1099 char *readline_line = NULL;
1100 if (fn_readline != NULL)
1102 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1103 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1104 p = US readline_line;
1109 /* readline() not in use */
1112 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1116 /* Handle the line */
1118 ss = p + (int)Ustrlen(p);
1119 while (ss > p && isspace(ss[-1])) ss--;
1123 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1126 yield = string_cat(yield, &size, &ptr, p, ss - p);
1129 if (fn_readline != NULL) free(readline_line);
1132 if (ss == p || yield[ptr-1] != '\\')
1140 if (yield == NULL) printf("\n");
1146 /*************************************************
1147 * Entry point and high-level code *
1148 *************************************************/
1150 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1151 the appropriate action. All the necessary functions are present in the one
1152 binary. I originally thought one should split it up, but it turns out that so
1153 much of the apparatus is needed in each chunk that one might as well just have
1154 it all available all the time, which then makes the coding easier as well.
1157 argc count of entries in argv
1158 argv argument strings, with argv[0] being the program name
1160 Returns: EXIT_SUCCESS if terminated successfully
1161 EXIT_FAILURE otherwise, except when a message has been sent
1162 to the sender, and -oee was given
1166 main(int argc, char **cargv)
1168 uschar **argv = USS cargv;
1169 int arg_receive_timeout = -1;
1170 int arg_smtp_receive_timeout = -1;
1171 int arg_error_handling = error_handling;
1175 int list_queue_option = 0;
1177 int msg_action_arg = -1;
1178 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1179 int queue_only_reason = 0;
1181 int perl_start_option = 0;
1183 int recipients_arg = argc;
1184 int sender_address_domain = 0;
1185 int test_retry_arg = -1;
1186 int test_rewrite_arg = -1;
1187 BOOL arg_queue_only = FALSE;
1188 BOOL bi_option = FALSE;
1189 BOOL checking = FALSE;
1190 BOOL count_queue = FALSE;
1191 BOOL expansion_test = FALSE;
1192 BOOL extract_recipients = FALSE;
1193 BOOL forced_delivery = FALSE;
1194 BOOL f_end_dot = FALSE;
1195 BOOL deliver_give_up = FALSE;
1196 BOOL list_queue = FALSE;
1197 BOOL list_options = FALSE;
1198 BOOL local_queue_only;
1200 BOOL one_msg_action = FALSE;
1201 BOOL queue_only_set = FALSE;
1202 BOOL receiving_message = TRUE;
1204 BOOL removed_privilege = FALSE;
1205 BOOL verify_address_mode = FALSE;
1206 BOOL verify_as_sender = FALSE;
1207 BOOL version_printed = FALSE;
1208 uschar *alias_arg = NULL;
1209 uschar *called_as = US"";
1210 uschar *start_queue_run_id = NULL;
1211 uschar *stop_queue_run_id = NULL;
1212 uschar *ftest_domain = NULL;
1213 uschar *ftest_localpart = NULL;
1214 uschar *ftest_prefix = NULL;
1215 uschar *ftest_suffix = NULL;
1216 uschar *real_sender_address;
1217 uschar *originator_home = US"/";
1218 BOOL ftest_system = FALSE;
1222 struct stat statbuf;
1223 pid_t passed_qr_pid = (pid_t)0;
1224 int passed_qr_pipe = -1;
1225 gid_t group_list[NGROUPS_MAX];
1227 /* Possible options for -R and -S */
1229 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1231 /* Need to define this in case we need to change the environment in order
1232 to get rid of a bogus time zone. We have to make it char rather than uschar
1233 because some OS define it in /usr/include/unistd.h. */
1235 extern char **environ;
1237 /* If the Exim user and/or group and/or the configuration file owner/group were
1238 defined by ref:name at build time, we must now find the actual uid/gid values.
1239 This is a feature to make the lives of binary distributors easier. */
1241 #ifdef EXIM_USERNAME
1242 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1244 exim_gid = pw->pw_gid;
1248 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1254 #ifdef EXIM_GROUPNAME
1255 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1257 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1263 #ifdef CONFIGURE_OWNERNAME
1264 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1266 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1267 CONFIGURE_OWNERNAME);
1272 #ifdef CONFIGURE_GROUPNAME
1273 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1275 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1276 CONFIGURE_GROUPNAME);
1281 /* In the Cygwin environment, some initialization needs doing. It is fudged
1282 in by means of this macro. */
1288 /* Check a field which is patched when we are running Exim within its
1289 testing harness; do a fast initial check, and then the whole thing. */
1291 running_in_test_harness =
1292 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1294 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1295 at the start of a program; however, it seems that some environments do not
1296 follow this. A "strange" locale can affect the formatting of timestamps, so we
1299 setlocale(LC_ALL, "C");
1301 /* Set up the default handler for timing using alarm(). */
1303 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1305 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1306 because store_malloc writes a log entry on failure. */
1308 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1309 if (log_buffer == NULL)
1311 fprintf(stderr, "exim: failed to get store for log buffer\n");
1315 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1316 NULL when the daemon is run and the file is closed. We have to use this
1317 indirection, because some systems don't allow writing to the variable "stderr".
1320 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1322 /* Arrange for the PCRE regex library to use our store functions. Note that
1323 the normal calls are actually macros that add additional arguments for
1324 debugging purposes so we have to assign specially constructed functions here.
1325 The default is to use store in the stacking pool, but this is overridden in the
1326 regex_must_compile() function. */
1328 pcre_malloc = function_store_get;
1329 pcre_free = function_dummy_free;
1331 /* Ensure there is a big buffer for temporary use in several places. It is put
1332 in malloc store so that it can be freed for enlargement if necessary. */
1334 big_buffer = store_malloc(big_buffer_size);
1336 /* Set up the handler for the data request signal, and set the initial
1337 descriptive text. */
1339 set_process_info("initializing");
1340 os_restarting_signal(SIGUSR1, usr1_handler);
1342 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1343 in the daemon code. For the rest of Exim's uses, we ignore it. */
1345 signal(SIGHUP, SIG_IGN);
1347 /* We don't want to die on pipe errors as the code is written to handle
1348 the write error instead. */
1350 signal(SIGPIPE, SIG_IGN);
1352 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1353 set to SIG_IGN. This causes subprocesses that complete before the parent
1354 process waits for them not to hang around, so when Exim calls wait(), nothing
1355 is there. The wait() code has been made robust against this, but let's ensure
1356 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1357 ending status. We use sigaction rather than plain signal() on those OS where
1358 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1359 problem on AIX with this.) */
1363 struct sigaction act;
1364 act.sa_handler = SIG_DFL;
1365 sigemptyset(&(act.sa_mask));
1367 sigaction(SIGCHLD, &act, NULL);
1370 signal(SIGCHLD, SIG_DFL);
1373 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1378 /* Set up the version number. Set up the leading 'E' for the external form of
1379 message ids, set the pointer to the internal form, and initialize it to
1380 indicate no message being processed. */
1383 message_id_option[0] = '-';
1384 message_id_external = message_id_option + 1;
1385 message_id_external[0] = 'E';
1386 message_id = message_id_external + 1;
1389 /* Set the umask to zero so that any files that Exim creates are created
1390 with the modes that it specifies. */
1394 /* Precompile the regular expression for matching a message id. Keep this in
1395 step with the code that generates ids in the accept.c module. We need to do
1396 this here, because the -M options check their arguments for syntactic validity
1397 using mac_ismsgid, which uses this. */
1400 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1402 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1403 this seems to be a generally accepted convention, since one finds symbolic
1404 links called "mailq" in standard OS configurations. */
1406 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1407 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1410 receiving_message = FALSE;
1411 called_as = US"-mailq";
1414 /* If the program is called as "rmail" treat it as equivalent to
1415 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1416 i.e. preventing a single dot on a line from terminating the message, and
1417 returning with zero return code, even in cases of error (provided an error
1418 message has been sent). */
1420 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1421 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1424 called_as = US"-rmail";
1425 errors_sender_rc = EXIT_SUCCESS;
1428 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1429 this is a smail convention. */
1431 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1432 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1434 smtp_input = smtp_batched_input = TRUE;
1435 called_as = US"-rsmtp";
1438 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1439 this is a smail convention. */
1441 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1442 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1445 receiving_message = FALSE;
1446 called_as = US"-runq";
1449 /* If the program is called as "newaliases" treat it as equivalent to
1450 "exim -bi"; this is a sendmail convention. */
1452 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1453 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1456 receiving_message = FALSE;
1457 called_as = US"-newaliases";
1460 /* Save the original effective uid for a couple of uses later. It should
1461 normally be root, but in some esoteric environments it may not be. */
1463 original_euid = geteuid();
1465 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1466 to be the same as the real ones. This makes a difference only if Exim is setuid
1467 (or setgid) to something other than root, which could be the case in some
1468 special configurations. */
1470 real_uid = getuid();
1471 real_gid = getgid();
1473 if (real_uid == root_uid)
1479 /* If neither the original real uid nor the original euid was root, Exim is
1480 running in an unprivileged state. */
1482 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1484 /* If the first argument is --help, pretend there are no arguments. This will
1485 cause a brief message to be given. */
1487 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1489 /* Scan the program's arguments. Some can be dealt with right away; others are
1490 simply recorded for checking and handling afterwards. Do a high-level switch
1491 on the second character (the one after '-'), to save some effort. */
1493 for (i = 1; i < argc; i++)
1495 BOOL badarg = FALSE;
1496 uschar *arg = argv[i];
1500 /* An argument not starting with '-' is the start of a recipients list;
1501 break out of the options-scanning loop. */
1509 /* An option consistion of -- terminates the options */
1511 if (Ustrcmp(arg, "--") == 0)
1513 recipients_arg = i + 1;
1517 /* Handle flagged options */
1519 switchchar = arg[1];
1522 /* Make all -ex options synonymous with -oex arguments, since that
1523 is assumed by various callers. Also make -qR options synonymous with -R
1524 options, as that seems to be required as well. Allow for -qqR too, and
1525 the same for -S options. */
1527 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1528 Ustrncmp(arg+1, "qR", 2) == 0 ||
1529 Ustrncmp(arg+1, "qS", 2) == 0)
1531 switchchar = arg[2];
1534 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1536 switchchar = arg[3];
1538 queue_2stage = TRUE;
1541 /* Make -r synonymous with -f, since it is a documented alias */
1543 else if (arg[1] == 'r') switchchar = 'f';
1545 /* Make -ov synonymous with -v */
1547 else if (Ustrcmp(arg, "-ov") == 0)
1553 /* High-level switch on active initial letter */
1557 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1558 so has no need of it. */
1561 if (*argrest == 0) i++; /* Skip over the type */
1566 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1568 /* -bd: Run in daemon mode, awaiting SMTP connections.
1569 -bdf: Ditto, but in the foreground.
1572 if (*argrest == 'd')
1574 daemon_listen = TRUE;
1575 if (*(++argrest) == 'f') background_daemon = FALSE;
1576 else if (*argrest != 0) { badarg = TRUE; break; }
1579 /* -be: Run in expansion test mode */
1581 else if (*argrest == 'e')
1582 expansion_test = checking = TRUE;
1584 /* -bf: Run in mail filter testing mode
1585 -bF: Ditto, but for system filters
1586 -bfd: Set domain for filter testing
1587 -bfl: Set local part for filter testing
1588 -bfp: Set prefix for filter testing
1589 -bfs: Set suffix for filter testing
1592 else if (*argrest == 'f' || *argrest == 'F')
1594 ftest_system = *argrest++ == 'F';
1597 if(++i < argc) filter_test = argv[i]; else
1599 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1607 fprintf(stderr, "exim: string expected after %s\n", arg);
1610 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1611 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1612 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1613 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1614 else { badarg = TRUE; break; }
1618 /* -bh: Host checking - an IP address must follow. */
1620 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1622 if (++i >= argc) { badarg = TRUE; break; }
1623 sender_host_address = argv[i];
1624 host_checking = checking = log_testing_mode = TRUE;
1625 host_checking_callout = argrest[1] == 'c';
1628 /* -bi: This option is used by sendmail to initialize *the* alias file,
1629 though it has the -oA option to specify a different file. Exim has no
1630 concept of *the* alias file, but since Sun's YP make script calls
1631 sendmail this way, some support must be provided. */
1633 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1635 /* -bm: Accept and deliver message - the default option. Reinstate
1636 receiving_message, which got turned off for all -b options. */
1638 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1640 /* -bnq: For locally originating messages, do not qualify unqualified
1641 addresses. In the envelope, this causes errors; in header lines they
1644 else if (Ustrcmp(argrest, "nq") == 0)
1646 allow_unqualified_sender = FALSE;
1647 allow_unqualified_recipient = FALSE;
1650 /* -bpxx: List the contents of the mail queue, in various forms. If
1651 the option is -bpc, just a queue count is needed. Otherwise, if the
1652 first letter after p is r, then order is random. */
1654 else if (*argrest == 'p')
1656 if (*(++argrest) == 'c')
1659 if (*(++argrest) != 0) badarg = TRUE;
1663 if (*argrest == 'r')
1665 list_queue_option = 8;
1668 else list_queue_option = 0;
1672 /* -bp: List the contents of the mail queue, top-level only */
1674 if (*argrest == 0) {}
1676 /* -bpu: List the contents of the mail queue, top-level undelivered */
1678 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1680 /* -bpa: List the contents of the mail queue, including all delivered */
1682 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1684 /* Unknown after -bp[r] */
1694 /* -bP: List the configuration variables given as the address list.
1695 Force -v, so configuration errors get displayed. */
1697 else if (Ustrcmp(argrest, "P") == 0)
1699 list_options = TRUE;
1700 debug_selector |= D_v;
1701 debug_file = stderr;
1704 /* -brt: Test retry configuration lookup */
1706 else if (Ustrcmp(argrest, "rt") == 0)
1708 test_retry_arg = i + 1;
1712 /* -brw: Test rewrite configuration */
1714 else if (Ustrcmp(argrest, "rw") == 0)
1716 test_rewrite_arg = i + 1;
1720 /* -bS: Read SMTP commands on standard input, but produce no replies -
1721 all errors are reported by sending messages. */
1723 else if (Ustrcmp(argrest, "S") == 0)
1724 smtp_input = smtp_batched_input = receiving_message = TRUE;
1726 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1727 on standard output. */
1729 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1731 /* -bt: address testing mode */
1733 else if (Ustrcmp(argrest, "t") == 0)
1734 address_test_mode = checking = log_testing_mode = TRUE;
1736 /* -bv: verify addresses */
1738 else if (Ustrcmp(argrest, "v") == 0)
1739 verify_address_mode = checking = log_testing_mode = TRUE;
1741 /* -bvs: verify sender addresses */
1743 else if (Ustrcmp(argrest, "vs") == 0)
1745 verify_address_mode = checking = log_testing_mode = TRUE;
1746 verify_as_sender = TRUE;
1749 /* -bV: Print version string and support details */
1751 else if (Ustrcmp(argrest, "V") == 0)
1753 printf("Exim version %s #%s built %s\n", version_string,
1754 version_cnumber, version_date);
1755 printf("%s\n", CS version_copyright);
1756 version_printed = TRUE;
1757 show_whats_supported(stdout);
1764 /* -C: change configuration file list; ignore if it isn't really
1765 a change! Enforce a prefix check if required. */
1770 if(++i < argc) argrest = argv[i]; else
1771 { badarg = TRUE; break; }
1773 if (Ustrcmp(config_main_filelist, argrest) != 0)
1775 #ifdef ALT_CONFIG_PREFIX
1777 int len = Ustrlen(ALT_CONFIG_PREFIX);
1778 uschar *list = argrest;
1780 while((filename = string_nextinlist(&list, &sep, big_buffer,
1781 big_buffer_size)) != NULL)
1783 if ((Ustrlen(filename) < len ||
1784 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1785 Ustrstr(filename, "/../") != NULL) &&
1786 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1788 fprintf(stderr, "-C Permission denied\n");
1794 config_main_filelist = argrest;
1795 config_changed = TRUE;
1800 /* -D: set up a macro definition */
1803 #ifdef DISABLE_D_OPTION
1804 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1809 macro_item *mlast = NULL;
1812 uschar *s = argrest;
1814 while (isspace(*s)) s++;
1816 if (*s < 'A' || *s > 'Z')
1818 fprintf(stderr, "exim: macro name set by -D must start with "
1819 "an upper case letter\n");
1823 while (isalnum(*s) || *s == '_')
1825 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1829 if (ptr == 0) { badarg = TRUE; break; }
1830 while (isspace(*s)) s++;
1833 if (*s++ != '=') { badarg = TRUE; break; }
1834 while (isspace(*s)) s++;
1837 for (m = macros; m != NULL; m = m->next)
1839 if (Ustrcmp(m->name, name) == 0)
1841 fprintf(stderr, "exim: duplicated -D in command line\n");
1847 m = store_get(sizeof(macro_item) + Ustrlen(name));
1849 m->command_line = TRUE;
1850 if (mlast == NULL) macros = m; else mlast->next = m;
1851 Ustrcpy(m->name, name);
1852 m->replacement = string_copy(s);
1854 if (clmacro_count >= MAX_CLMACROS)
1856 fprintf(stderr, "exim: too many -D options on command line\n");
1859 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1865 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1866 The latter is now a no-opt, retained for compatibility only. */
1869 if (Ustrcmp(argrest, "ropcr") == 0)
1871 /* drop_cr = TRUE; */
1874 /* Use an intermediate variable so that we don't set debugging while
1875 decoding the debugging bits. */
1879 unsigned int selector = D_default;
1883 decode_bits(&selector, NULL, argrest, debug_options,
1884 debug_options_count, US"debug");
1885 debug_selector = selector;
1890 /* -E: This is a local error message. This option is not intended for
1891 external use at all, but is not restricted to trusted callers because it
1892 does no harm (just suppresses certain error messages) and if Exim is run
1893 not setuid root it won't always be trusted when it generates error
1894 messages using this option. If there is a message id following -E, point
1895 message_reference at it, for logging. */
1898 local_error_message = TRUE;
1899 if (mac_ismsgid(argrest)) message_reference = argrest;
1903 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1904 option, so it looks as if historically the -oex options are also callable
1905 without the leading -o. So we have to accept them. Before the switch,
1906 anything starting -oe has been converted to -e. Exim does not support all
1907 of the sendmail error options. */
1910 if (Ustrcmp(argrest, "e") == 0)
1912 arg_error_handling = ERRORS_SENDER;
1913 errors_sender_rc = EXIT_SUCCESS;
1915 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1916 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1917 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1918 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1923 /* -F: Set sender's full name, used instead of the gecos entry from
1924 the password file. Since users can usually alter their gecos entries,
1925 there's no security involved in using this instead. The data can follow
1926 the -F or be in the next argument. */
1931 if(++i < argc) argrest = argv[i]; else
1932 { badarg = TRUE; break; }
1934 originator_name = argrest;
1938 /* -f: Set sender's address - this value is only actually used if Exim is
1939 run by a trusted user, or if untrusted_set_sender is set and matches the
1940 address, except that the null address can always be set by any user. The
1941 test for this happens later, when the value given here is ignored when not
1942 permitted. For an untrusted user, the actual sender is still put in Sender:
1943 if it doesn't match the From: header (unless no_local_from_check is set).
1944 The data can follow the -f or be in the next argument. The -r switch is an
1945 obsolete form of -f but since there appear to be programs out there that
1946 use anything that sendmail has ever supported, better accept it - the
1947 synonymizing is done before the switch above.
1949 At this stage, we must allow domain literal addresses, because we don't
1950 know what the setting of allow_domain_literals is yet. Ditto for trailing
1951 dots and strip_trailing_dot. */
1959 if (i+1 < argc) argrest = argv[++i]; else
1960 { badarg = TRUE; break; }
1964 sender_address = string_sprintf(""); /* Ensure writeable memory */
1968 uschar *temp = argrest + Ustrlen(argrest) - 1;
1969 while (temp >= argrest && isspace(*temp)) temp--;
1970 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
1971 allow_domain_literals = TRUE;
1972 strip_trailing_dot = TRUE;
1973 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
1974 &sender_address_domain, TRUE);
1975 allow_domain_literals = FALSE;
1976 strip_trailing_dot = FALSE;
1977 if (sender_address == NULL)
1979 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
1980 return EXIT_FAILURE;
1983 sender_address_forced = TRUE;
1987 /* This is some Sendmail thing which can be ignored */
1992 /* -h: Set the hop count for an incoming message. Exim does not currently
1993 support this; it always computes it by counting the Received: headers.
1994 To put it in will require a change to the spool header file format. */
1999 if(++i < argc) argrest = argv[i]; else
2000 { badarg = TRUE; break; }
2002 if (!isdigit(*argrest)) badarg = TRUE;
2006 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2007 not to be documented for sendmail but mailx (at least) uses it) */
2010 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2015 receiving_message = FALSE;
2017 /* -MC: continue delivery of another message via an existing open
2018 file descriptor. This option is used for an internal call by the
2019 smtp transport when there is a pending message waiting to go to an
2020 address to which it has got a connection. Five subsequent arguments are
2021 required: transport name, host name, IP address, sequence number, and
2022 message_id. Transports may decline to create new processes if the sequence
2023 number gets too big. The channel is stdin. This (-MC) must be the last
2024 argument. There's a subsequent check that the real-uid is privileged.
2026 If we are running in the test harness. delay for a bit, to let the process
2027 that set this one up complete. This makes for repeatability of the logging,
2030 if (Ustrcmp(argrest, "C") == 0)
2034 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2035 return EXIT_FAILURE;
2038 if (msg_action_arg >= 0)
2040 fprintf(stderr, "exim: incompatible arguments\n");
2041 return EXIT_FAILURE;
2044 continue_transport = argv[++i];
2045 continue_hostname = argv[++i];
2046 continue_host_address = argv[++i];
2047 continue_sequence = Uatoi(argv[++i]);
2048 msg_action = MSG_DELIVER;
2049 msg_action_arg = ++i;
2050 forced_delivery = TRUE;
2051 queue_run_pid = passed_qr_pid;
2052 queue_run_pipe = passed_qr_pipe;
2054 if (!mac_ismsgid(argv[i]))
2056 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2058 return EXIT_FAILURE;
2061 if (running_in_test_harness) millisleep(500);
2065 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2066 precedes -MC (see above). The flag indicates that the host to which
2067 Exim is connected has accepted an AUTH sequence. */
2069 else if (Ustrcmp(argrest, "CA") == 0)
2071 smtp_authenticated = TRUE;
2075 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2076 it preceded -MC (see above) */
2078 else if (Ustrcmp(argrest, "CP") == 0)
2080 smtp_use_pipelining = TRUE;
2084 /* -MCQ: pass on the pid of the queue-running process that started
2085 this chain of deliveries and the fd of its synchronizing pipe; this
2086 is useful only when it precedes -MC (see above) */
2088 else if (Ustrcmp(argrest, "CQ") == 0)
2090 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2092 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2097 /* -MCS: set the smtp_use_size flag; this is useful only when it
2098 precedes -MC (see above) */
2100 else if (Ustrcmp(argrest, "CS") == 0)
2102 smtp_use_size = TRUE;
2106 /* -MCT: set the tls_offered flag; this is useful only when it
2107 precedes -MC (see above). The flag indicates that the host to which
2108 Exim is connected has offered TLS support. */
2111 else if (Ustrcmp(argrest, "CT") == 0)
2118 /* -M[x]: various operations on the following list of message ids:
2119 -M deliver the messages, ignoring next retry times and thawing
2120 -Mc deliver the messages, checking next retry times, no thawing
2121 -Mf freeze the messages
2122 -Mg give up on the messages
2123 -Mt thaw the messages
2124 -Mrm remove the messages
2125 In the above cases, this must be the last option. There are also the
2126 following options which are followed by a single message id, and which
2127 act on that message. Some of them use the "recipient" addresses as well.
2128 -Mar add recipient(s)
2129 -Mmad mark all recipients delivered
2130 -Mmd mark recipients(s) delivered
2137 else if (*argrest == 0)
2139 msg_action = MSG_DELIVER;
2140 forced_delivery = deliver_force_thaw = TRUE;
2142 else if (Ustrcmp(argrest, "ar") == 0)
2144 msg_action = MSG_ADD_RECIPIENT;
2145 one_msg_action = TRUE;
2147 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2148 else if (Ustrcmp(argrest, "es") == 0)
2150 msg_action = MSG_EDIT_SENDER;
2151 one_msg_action = TRUE;
2153 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2154 else if (Ustrcmp(argrest, "g") == 0)
2156 msg_action = MSG_DELIVER;
2157 deliver_give_up = TRUE;
2159 else if (Ustrcmp(argrest, "mad") == 0)
2161 msg_action = MSG_MARK_ALL_DELIVERED;
2163 else if (Ustrcmp(argrest, "md") == 0)
2165 msg_action = MSG_MARK_DELIVERED;
2166 one_msg_action = TRUE;
2168 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2169 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2170 else if (Ustrcmp(argrest, "vb") == 0)
2172 msg_action = MSG_SHOW_BODY;
2173 one_msg_action = TRUE;
2175 else if (Ustrcmp(argrest, "vh") == 0)
2177 msg_action = MSG_SHOW_HEADER;
2178 one_msg_action = TRUE;
2180 else if (Ustrcmp(argrest, "vl") == 0)
2182 msg_action = MSG_SHOW_LOG;
2183 one_msg_action = TRUE;
2185 else { badarg = TRUE; break; }
2187 /* All the -Mxx options require at least one message id. */
2189 msg_action_arg = i + 1;
2190 if (msg_action_arg >= argc)
2192 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2193 return EXIT_FAILURE;
2196 /* Some require only message ids to follow */
2198 if (!one_msg_action)
2201 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2203 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2205 return EXIT_FAILURE;
2207 goto END_ARG; /* Remaining args are ids */
2210 /* Others require only one message id, possibly followed by addresses,
2211 which will be handled as normal arguments. */
2215 if (!mac_ismsgid(argv[msg_action_arg]))
2217 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2218 argv[msg_action_arg], arg);
2219 return EXIT_FAILURE;
2226 /* Some programs seem to call the -om option without the leading o;
2227 for sendmail it askes for "me too". Exim always does this. */
2230 if (*argrest != 0) badarg = TRUE;
2234 /* -N: don't do delivery - a debugging option that stops transports doing
2235 their thing. It implies debugging at the D_v level. */
2240 dont_deliver = TRUE;
2241 debug_selector |= D_v;
2242 debug_file = stderr;
2248 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2254 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2255 option to the specified value. This form uses long names. We need to handle
2256 -O option=value and -Ooption=value. */
2263 fprintf(stderr, "exim: string expected after -O\n");
2271 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2274 if (*argrest == 'A')
2276 alias_arg = argrest + 1;
2277 if (alias_arg[0] == 0)
2279 if (i+1 < argc) alias_arg = argv[++i]; else
2281 fprintf(stderr, "exim: string expected after -oA\n");
2287 /* -oB: Set a connection message max value for remote deliveries */
2289 else if (*argrest == 'B')
2291 uschar *p = argrest + 1;
2294 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2296 connection_max_messages = 1;
2305 fprintf(stderr, "exim: number expected after -oB\n");
2308 connection_max_messages = Uatoi(p);
2312 /* -odb: background delivery */
2314 else if (Ustrcmp(argrest, "db") == 0)
2316 synchronous_delivery = FALSE;
2317 arg_queue_only = FALSE;
2318 queue_only_set = TRUE;
2321 /* -odf: foreground delivery (smail-compatible option); same effect as
2322 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2325 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2327 synchronous_delivery = TRUE;
2328 arg_queue_only = FALSE;
2329 queue_only_set = TRUE;
2332 /* -odq: queue only */
2334 else if (Ustrcmp(argrest, "dq") == 0)
2336 synchronous_delivery = FALSE;
2337 arg_queue_only = TRUE;
2338 queue_only_set = TRUE;
2341 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2342 but no remote delivery */
2344 else if (Ustrcmp(argrest, "dqs") == 0)
2347 arg_queue_only = FALSE;
2348 queue_only_set = TRUE;
2351 /* -oex: Sendmail error flags. As these are also accepted without the
2352 leading -o prefix, for compatibility with vacation and other callers,
2353 they are handled with -e above. */
2355 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2356 -oitrue: Another sendmail syntax for the same */
2358 else if (Ustrcmp(argrest, "i") == 0 ||
2359 Ustrcmp(argrest, "itrue") == 0)
2362 /* -oM*: Set various characteristics for an incoming message; actually
2363 acted on for trusted callers only. */
2365 else if (*argrest == 'M')
2369 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2373 /* -oMa: Set sender host address */
2375 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2377 /* -oMaa: Set authenticator name */
2379 else if (Ustrcmp(argrest, "Maa") == 0)
2380 sender_host_authenticated = argv[++i];
2382 /* -oMas: setting authenticated sender */
2384 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2386 /* -oMai: setting authenticated id */
2388 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2390 /* -oMi: Set incoming interface address */
2392 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2394 /* -oMr: Received protocol */
2396 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2398 /* -oMs: Set sender host name */
2400 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2402 /* -oMt: Set sender ident */
2404 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2406 /* Else a bad argument */
2415 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2416 seem to call this as -m (undocumented), so that is also accepted (see
2419 else if (Ustrcmp(argrest, "m") == 0) {}
2421 /* -oo: An ancient flag for old-style addresses which still seems to
2422 crop up in some calls (see in SCO). */
2424 else if (Ustrcmp(argrest, "o") == 0) {}
2426 /* -oP <name>: set pid file path for daemon */
2428 else if (Ustrcmp(argrest, "P") == 0)
2429 override_pid_file_path = argv[++i];
2431 /* -or <n>: set timeout for non-SMTP acceptance
2432 -os <n>: set timeout for SMTP acceptance */
2434 else if (*argrest == 'r' || *argrest == 's')
2436 int *tp = (*argrest == 'r')?
2437 &arg_receive_timeout : &arg_smtp_receive_timeout;
2438 if (argrest[1] == 0)
2440 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2442 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2445 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2450 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2452 else if (Ustrcmp(argrest, "X") == 0)
2453 override_local_interfaces = argv[++i];
2455 /* Unknown -o argument */
2461 /* -ps: force Perl startup; -pd force delayed Perl startup */
2465 if (*argrest == 's' && argrest[1] == 0)
2467 perl_start_option = 1;
2470 if (*argrest == 'd' && argrest[1] == 0)
2472 perl_start_option = -1;
2477 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2478 which sets the host protocol and host name */
2482 if (i+1 < argc) argrest = argv[++i]; else
2483 { badarg = TRUE; break; }
2488 uschar *hn = Ustrchr(argrest, ':');
2491 received_protocol = argrest;
2495 received_protocol = string_copyn(argrest, hn - argrest);
2496 sender_host_name = hn + 1;
2503 receiving_message = FALSE;
2505 /* -qq...: Do queue runs in a 2-stage manner */
2507 if (*argrest == 'q')
2509 queue_2stage = TRUE;
2513 /* -qi...: Do only first (initial) deliveries */
2515 if (*argrest == 'i')
2517 queue_run_first_delivery = TRUE;
2521 /* -qf...: Run the queue, forcing deliveries
2522 -qff..: Ditto, forcing thawing as well */
2524 if (*argrest == 'f')
2526 queue_run_force = TRUE;
2527 if (*(++argrest) == 'f')
2529 deliver_force_thaw = TRUE;
2534 /* -q[f][f]l...: Run the queue only on local deliveries */
2536 if (*argrest == 'l')
2538 queue_run_local = TRUE;
2542 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2543 optionally starting from a given message id. */
2545 if (*argrest == 0 &&
2546 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2549 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2550 start_queue_run_id = argv[++i];
2551 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2552 stop_queue_run_id = argv[++i];
2555 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2556 optionally local only. */
2561 queue_interval = readconf_readtime(argrest, 0, FALSE);
2563 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2564 if (queue_interval <= 0)
2566 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2573 case 'R': /* Synonymous with -qR... */
2574 receiving_message = FALSE;
2576 /* -Rf: As -R (below) but force all deliveries,
2577 -Rff: Ditto, but also thaw all frozen messages,
2578 -Rr: String is regex
2579 -Rrf: Regex and force
2580 -Rrff: Regex and force and thaw
2582 in all cases provided there are no further characters in this
2588 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2590 if (Ustrcmp(argrest, rsopts[i]) == 0)
2592 if (i != 2) queue_run_force = TRUE;
2593 if (i >= 2) deliver_selectstring_regex = TRUE;
2594 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2595 argrest += Ustrlen(rsopts[i]);
2600 /* -R: Set string to match in addresses for forced queue run to
2601 pick out particular messages. */
2605 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2607 fprintf(stderr, "exim: string expected after -R\n");
2611 else deliver_selectstring = argrest;
2612 if (queue_interval < 0) queue_interval = 0;
2616 /* -r: an obsolete synonym for -f (see above) */
2619 /* -S: Like -R but works on sender. */
2621 case 'S': /* Synonymous with -qS... */
2622 receiving_message = FALSE;
2624 /* -Sf: As -S (below) but force all deliveries,
2625 -Sff: Ditto, but also thaw all frozen messages,
2626 -Sr: String is regex
2627 -Srf: Regex and force
2628 -Srff: Regex and force and thaw
2630 in all cases provided there are no further characters in this
2636 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2638 if (Ustrcmp(argrest, rsopts[i]) == 0)
2640 if (i != 2) queue_run_force = TRUE;
2641 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2642 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2643 argrest += Ustrlen(rsopts[i]);
2648 /* -S: Set string to match in addresses for forced queue run to
2649 pick out particular messages. */
2653 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2655 fprintf(stderr, "exim: string expected after -S\n");
2659 else deliver_selectstring_sender = argrest;
2660 if (queue_interval < 0) queue_interval = 0;
2663 /* -Tqt is an option that is exclusively for use by the testing suite.
2664 It is not recognized in other circumstances. It allows for the setting up
2665 of explicit "queue times" so that various warning/retry things can be
2666 tested. Otherwise variability of clock ticks etc. cause problems. */
2669 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2670 fudged_queue_times = argv[++i];
2675 /* -t: Set flag to extract recipients from body of message. */
2678 if (*argrest == 0) extract_recipients = TRUE;
2680 /* -ti: Set flag to extract recipients from body of message, and also
2681 specify that dot does not end the message. */
2683 else if (Ustrcmp(argrest, "i") == 0)
2685 extract_recipients = TRUE;
2689 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2692 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2699 /* -U: This means "initial user submission" in sendmail, apparently. The
2700 doc claims that in future sendmail may refuse syntactically invalid
2701 messages instead of fixing them. For the moment, we just ignore it. */
2707 /* -v: verify things - this is a very low-level debugging */
2712 debug_selector |= D_v;
2713 debug_file = stderr;
2719 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2721 The -x flag tells the sendmail command that mail from a local
2722 mail program has National Language Support (NLS) extended characters
2723 in the body of the mail item. The sendmail command can send mail with
2724 extended NLS characters across networks that normally corrupts these
2727 As Exim is 8-bit clean, it just ignores this flag. */
2730 if (*argrest != 0) badarg = TRUE;
2733 /* All other initial characters are errors */
2738 } /* End of high-level switch statement */
2740 /* Failed to recognize the option, or syntax error */
2744 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2745 "option %s\n", arg);
2751 /* Arguments have been processed. Check for incompatibilities. */
2755 (smtp_input || extract_recipients || recipients_arg < argc) &&
2756 (daemon_listen || queue_interval >= 0 || bi_option ||
2757 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2758 filter_test != NULL || (msg_action_arg > 0 && !one_msg_action))
2761 msg_action_arg > 0 &&
2762 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2763 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2766 (daemon_listen || queue_interval >= 0) &&
2767 (sender_address != NULL || list_options || list_queue || checking ||
2771 daemon_listen && queue_interval == 0
2775 (checking || smtp_input || extract_recipients ||
2776 filter_test != NULL || bi_option)
2779 verify_address_mode &&
2780 (address_test_mode || smtp_input || extract_recipients ||
2781 filter_test != NULL || bi_option)
2784 address_test_mode && (smtp_input || extract_recipients ||
2785 filter_test != NULL || bi_option)
2788 smtp_input && (sender_address != NULL || filter_test != NULL ||
2792 deliver_selectstring != NULL && queue_interval < 0
2796 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2800 /* If debugging is set up, set the file and the file descriptor to pass on to
2801 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2802 to run in the foreground. */
2804 if (debug_selector != 0)
2806 debug_file = stderr;
2807 debug_fd = fileno(debug_file);
2808 background_daemon = FALSE;
2809 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2810 if (debug_selector != D_v) /* -v only doesn't show this */
2812 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2813 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2815 show_whats_supported(stderr);
2819 /* When started with root privilege, ensure that the limits on the number of
2820 open files and the number of processes (where that is accessible) are
2821 sufficiently large, or are unset, in case Exim has been called from an
2822 environment where the limits are screwed down. Not all OS have the ability to
2823 change some of these limits. */
2827 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2833 #ifdef RLIMIT_NOFILE
2834 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2836 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2838 rlp.rlim_cur = rlp.rlim_max = 0;
2841 /* I originally chose 1000 as a nice big number that was unlikely to
2842 be exceeded. It turns out that some older OS have a fixed upper limit of
2845 if (rlp.rlim_cur < 1000)
2847 rlp.rlim_cur = rlp.rlim_max = 1000;
2848 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2850 rlp.rlim_cur = rlp.rlim_max = 256;
2851 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2852 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2859 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2861 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2863 rlp.rlim_cur = rlp.rlim_max = 0;
2866 #ifdef RLIM_INFINITY
2867 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2869 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2871 if (rlp.rlim_cur < 1000)
2873 rlp.rlim_cur = rlp.rlim_max = 1000;
2875 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2876 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2882 /* Exim is normally entered as root (but some special configurations are
2883 possible that don't do this). However, it always spins off sub-processes that
2884 set their uid and gid as required for local delivery. We don't want to pass on
2885 any extra groups that root may belong to, so we want to get rid of them all at
2888 We need to obey setgroups() at this stage, before possibly giving up root
2889 privilege for a changed configuration file, but later on we might need to
2890 check on the additional groups for the admin user privilege - can't do that
2891 till after reading the config, which might specify the exim gid. Therefore,
2892 save the group list here first. */
2894 group_count = getgroups(NGROUPS_MAX, group_list);
2896 /* There is a fundamental difference in some BSD systems in the matter of
2897 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2898 known not to be different. On the "different" systems there is a single group
2899 list, and the first entry in it is the current group. On all other versions of
2900 Unix there is a supplementary group list, which is in *addition* to the current
2901 group. Consequently, to get rid of all extraneous groups on a "standard" system
2902 you pass over 0 groups to setgroups(), while on a "different" system you pass
2903 over a single group - the current group, which is always the first group in the
2904 list. Calling setgroups() with zero groups on a "different" system results in
2905 an error return. The following code should cope with both types of system.
2907 However, if this process isn't running as root, setgroups() can't be used
2908 since you have to be root to run it, even if throwing away groups. Not being
2909 root here happens only in some unusual configurations. We just ignore the
2912 if (setgroups(0, NULL) != 0)
2914 if (setgroups(1, group_list) != 0 && !unprivileged)
2916 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2921 /* If the configuration file name has been altered by an argument on the
2922 command line (either a new file name or a macro definition) and the caller is
2923 not root or the exim user, or if this is a filter testing run, remove any
2924 setuid privilege the program has, and run as the underlying user.
2926 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2927 severely restricts the use of -C for some purposes.
2929 Otherwise, set the real ids to the effective values (should be root unless run
2930 from inetd, which it can either be root or the exim uid, if one is configured).
2932 There is a private mechanism for bypassing some of this, in order to make it
2933 possible to test lots of configurations automatically, without having either to
2934 recompile each time, or to patch in an actual configuration file name and other
2935 values (such as the path name). If running in the test harness, pretend that
2936 configuration file changes and macro definitions haven't happened. */
2939 (config_changed || macros != NULL) && /* Config changed, and */
2940 real_uid != root_uid && /* Not root, and */
2941 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2942 real_uid != exim_uid && /* Not exim, and */
2944 !running_in_test_harness /* Not fudged */
2946 expansion_test /* expansion testing */
2948 filter_test != NULL) /* Filter testing */
2950 setgroups(group_count, group_list);
2951 exim_setugid(real_uid, real_gid, FALSE,
2952 US"-C, -D, -be or -bf forces real uid");
2953 removed_privilege = TRUE;
2955 /* In the normal case when Exim is called like this, stderr is available
2956 and should be used for any logging information because attempts to write
2957 to the log will usually fail. To arrange this, we unset really_exim. However,
2958 if no stderr is available there is no point - we might as well have a go
2959 at the log (if it fails, syslog will be written). */
2961 if (log_stderr != NULL) really_exim = FALSE;
2964 /* Privilege is to be retained for the moment. It may be dropped later,
2965 depending on the job that this Exim process has been asked to do. For now, set
2966 the real uid to the effective so that subsequent re-execs of Exim are done by a
2969 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
2971 /* If testing a filter, open the file now, before wasting time doing other
2972 setups and reading the message. */
2974 if (filter_test != NULL)
2976 filter_fd = Uopen(filter_test, O_RDONLY,0);
2979 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test,
2981 return EXIT_FAILURE;
2985 /* Read the main runtime configuration data; this gives up if there
2986 is a failure. It leaves the configuration file open so that the subsequent
2987 configuration data for delivery can be read if needed. */
2991 /* Handle the decoding of logging options. */
2993 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
2994 log_options, log_options_count, US"log");
2998 debug_printf("configuration file is %s\n", config_main_filename);
2999 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3000 log_extra_selector);
3003 /* If domain literals are not allowed, check the sender address that was
3004 supplied with -f. Ditto for a stripped trailing dot. */
3006 if (sender_address != NULL)
3008 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3010 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3011 "allowed\n", sender_address);
3012 return EXIT_FAILURE;
3014 if (f_end_dot && !strip_trailing_dot)
3016 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3017 "(trailing dot not allowed)\n", sender_address);
3018 return EXIT_FAILURE;
3022 /* Paranoia check of maximum lengths of certain strings. There is a check
3023 on the length of the log file path in log.c, which will come into effect
3024 if there are any calls to write the log earlier than this. However, if we
3025 get this far but the string is very long, it is better to stop now than to
3026 carry on and (e.g.) receive a message and then have to collapse. The call to
3027 log_write() from here will cause the ultimate panic collapse if the complete
3028 file name exceeds the buffer length. */
3030 if (Ustrlen(log_file_path) > 200)
3031 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3032 "log_file_path is longer than 200 chars: aborting");
3034 if (Ustrlen(pid_file_path) > 200)
3035 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3036 "pid_file_path is longer than 200 chars: aborting");
3038 if (Ustrlen(spool_directory) > 200)
3039 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3040 "spool_directory is longer than 200 chars: aborting");
3042 /* Length check on the process name given to syslog for its TAG field,
3043 which is only permitted to be 32 characters or less. See RFC 3164. */
3045 if (Ustrlen(syslog_processname) > 32)
3046 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3047 "syslog_processname is longer than 32 chars: aborting");
3049 /* In some operating systems, the environment variable TMPDIR controls where
3050 temporary files are created; Exim doesn't use these (apart from when delivering
3051 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3052 If TMPDIR is found in the environment, reset it to the value defined in the
3053 TMPDIR macro, if this macro is defined. */
3058 for (p = USS environ; *p != NULL; p++)
3060 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3061 Ustrcmp(*p+7, TMPDIR) != 0)
3063 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3064 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3066 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3072 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3073 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3074 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3075 called by a user who has set the TZ variable. This then affects the timestamps
3076 in log files and in Received: headers, and any created Date: header lines. The
3077 required timezone is settable in the configuration file, so nothing can be done
3078 about this earlier - but hopefully nothing will normally be logged earlier than
3079 this. We have to make a new environment if TZ is wrong, but don't bother if
3080 timestamps_utc is set, because then all times are in UTC anyway. */
3082 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3084 timestamps_utc = TRUE;
3088 uschar *envtz = US getenv("TZ");
3089 if ((envtz == NULL && timezone_string != NULL) ||
3091 (timezone_string == NULL ||
3092 Ustrcmp(timezone_string, envtz) != 0)))
3094 uschar **p = USS environ;
3098 while (*p++ != NULL) count++;
3099 if (envtz == NULL) count++;
3100 newp = new = malloc(sizeof(uschar *) * (count + 1));
3101 for (p = USS environ; *p != NULL; p++)
3103 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3106 if (timezone_string != NULL)
3108 *newp = malloc(Ustrlen(timezone_string) + 4);
3109 sprintf(CS *newp++, "TZ=%s", timezone_string);
3114 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3115 tod_stamp(tod_log));
3119 /* Handle the case when we have removed the setuid privilege because of -C or
3120 -D. This means that the caller of Exim was not root, and, provided that
3121 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3124 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3125 were running as the exim user defined in the configuration file (different to
3126 the one in the binary). The sysadmin may expect this case to retain privilege
3127 because "the binary was called by the Exim user", but it hasn't, because of the
3128 order in which it handles this stuff. There are two possibilities:
3130 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3131 to do message deliveries. Thus, the fact that it is running as a
3132 non-privileged user is plausible, and might be wanted in some special
3133 configurations. However, really_exim will have been set false when
3134 privilege was dropped, to stop Exim trying to write to its normal log
3135 files. Therefore, re-enable normal log processing, assuming the sysadmin
3136 has set up the log directory correctly.
3138 (2) If deliver_drop_privilege is not set, the configuration won't work as
3139 apparently intended, and so we log a panic message. In order to retain
3140 root for -C or -D, the caller must either be root or the Exim user
3141 defined in the binary (when deliver_drop_ privilege is false).
3143 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3144 built-in exim user or one defined in the configuration. In either event,
3145 re-enable log processing, assuming the sysadmin knows what they are doing. */
3147 if (removed_privilege && (config_changed || macros != NULL) &&
3148 real_uid == exim_uid)
3150 #ifdef ALT_CONFIG_ROOT_ONLY
3151 really_exim = TRUE; /* let logging work normally */
3154 if (deliver_drop_privilege)
3155 really_exim = TRUE; /* let logging work normally */
3157 log_write(0, LOG_MAIN|LOG_PANIC,
3158 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3159 (int)exim_uid, config_changed? "-C" : "-D");
3163 /* Start up Perl interpreter if Perl support is configured and there is a
3164 perl_startup option, and the configuration or the command line specifies
3165 initializing starting. Note that the global variables are actually called
3166 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3169 if (perl_start_option != 0)
3170 opt_perl_at_start = (perl_start_option > 0);
3171 if (opt_perl_at_start && opt_perl_startup != NULL)
3174 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3175 errstr = init_perl(opt_perl_startup);
3178 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3179 return EXIT_FAILURE;
3181 opt_perl_started = TRUE;
3183 #endif /* EXIM_PERL */
3185 /* Log the arguments of the call if the configuration file said so. This is
3186 a debugging feature for finding out what arguments certain MUAs actually use.
3187 Don't attempt it if logging is disabled, or if listing variables or if
3188 verifying/testing addresses or expansions. */
3190 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3191 && !list_options && !checking)
3194 uschar *p = big_buffer;
3196 (void)getcwd(CS p+4, big_buffer_size - 4);
3198 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3200 for (i = 0; i < argc; i++)
3202 int len = Ustrlen(argv[i]);
3205 if (p + len + 8 >= big_buffer + big_buffer_size)
3208 log_write(0, LOG_MAIN, "%s", big_buffer);
3209 Ustrcpy(big_buffer, "...");
3212 printing = string_printing(argv[i]);
3213 if (printing[0] == 0) quote = US"\""; else
3215 uschar *pp = printing;
3217 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3219 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3220 (p - big_buffer) - 4), printing, quote);
3223 log_write(0, LOG_MAIN, "%s", big_buffer);
3226 /* Set the working directory to be the top-level spool directory. We don't rely
3227 on this in the code, which always uses fully qualified names, but it's useful
3228 for core dumps etc. Don't complain if it fails - the spool directory might not
3229 be generally accessible and calls with the -C option (and others) have lost
3230 privilege by now. */
3232 if (Uchdir(spool_directory) != 0)
3234 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3235 (void)Uchdir(spool_directory);
3238 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3239 alias file. Exim doesn't have such a concept, but this call is screwed into
3240 Sun's YP makefiles. Handle this by calling a configured script, as the real
3241 user who called Exim. The -oA option can be used to pass an argument to the
3246 fclose(config_file);
3247 if (bi_command != NULL)
3251 argv[i++] = bi_command;
3252 if (alias_arg != NULL) argv[i++] = alias_arg;
3255 setgroups(group_count, group_list);
3256 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3258 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3259 (argv[1] == NULL)? US"" : argv[1]);
3261 execv(CS argv[0], (char *const *)argv);
3262 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3267 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3272 /* If an action on specific messages is requested, or if a daemon or queue
3273 runner is being started, we need to know if Exim was called by an admin user.
3274 This is the case if the real user is root or exim, or if the real group is
3275 exim, or if one of the supplementary groups is exim or a group listed in
3276 admin_groups. We don't fail all message actions immediately if not admin_user,
3277 since some actions can be performed by non-admin users. Instead, set admin_user
3278 for later interrogation. */
3280 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3286 for (i = 0; i < group_count; i++)
3288 if (group_list[i] == exim_gid) admin_user = TRUE;
3289 else if (admin_groups != NULL)
3291 for (j = 1; j <= (int)(admin_groups[0]); j++)
3292 if (admin_groups[j] == group_list[i])
3293 { admin_user = TRUE; break; }
3295 if (admin_user) break;
3299 /* Another group of privileged users are the trusted users. These are root,
3300 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3301 are permitted to specify sender_addresses with -f on the command line, and
3302 other message parameters as well. */
3304 if (real_uid == root_uid || real_uid == exim_uid)
3305 trusted_caller = TRUE;
3310 if (trusted_users != NULL)
3312 for (i = 1; i <= (int)(trusted_users[0]); i++)
3313 if (trusted_users[i] == real_uid)
3314 { trusted_caller = TRUE; break; }
3317 if (!trusted_caller && trusted_groups != NULL)
3319 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3321 if (trusted_groups[i] == real_gid)
3322 trusted_caller = TRUE;
3323 else for (j = 0; j < group_count; j++)
3325 if (trusted_groups[i] == group_list[j])
3326 { trusted_caller = TRUE; break; }
3328 if (trusted_caller) break;
3333 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3334 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3336 /* Only an admin user may start the daemon or force a queue run in the default
3337 configuration, but the queue run restriction can be relaxed. Only an admin
3338 user may request that a message be returned to its sender forthwith. Only an
3339 admin user may specify a debug level greater than D_v (because it might show
3340 passwords, etc. in lookup queries). Only an admin user may request a queue
3345 BOOL debugset = (debug_selector & ~D_v) != 0;
3346 if (deliver_give_up || daemon_listen ||
3347 (count_queue && queue_list_requires_admin) ||
3348 (list_queue && queue_list_requires_admin) ||
3349 (queue_interval >= 0 && prod_requires_admin) ||
3350 (debugset && !running_in_test_harness))
3352 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3357 /* If the real user is not root or the exim uid, the argument for passing
3358 in an open TCP/IP connection for another message is not permitted, nor is
3359 running with the -N option for any delivery action, unless this call to exim is
3360 one that supplied an input message, or we are using a patched exim for
3361 regression testing. */
3363 if (real_uid != root_uid && real_uid != exim_uid &&
3364 (continue_hostname != NULL ||
3366 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3367 )) && !running_in_test_harness)
3369 fprintf(stderr, "exim: Permission denied\n");
3370 return EXIT_FAILURE;
3373 /* If the caller is not trusted, certain arguments are ignored when running for
3374 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf). Note
3375 that authority for performing certain actions on messages is tested in the
3376 queue_action() function. */
3378 if (!trusted_caller && !checking && filter_test == NULL)
3380 sender_host_name = sender_host_address = interface_address =
3381 sender_ident = received_protocol = NULL;
3382 sender_host_port = interface_port = 0;
3383 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3386 /* If a sender host address is set, extract the optional port number off the
3387 end of it and check its syntax. Do the same thing for the interface address.
3388 Exim exits if the syntax is bad. */
3392 if (sender_host_address != NULL)
3393 sender_host_port = check_port(sender_host_address);
3394 if (interface_address != NULL)
3395 interface_port = check_port(interface_address);
3398 /* If an SMTP message is being received check to see if the standard input is a
3399 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3400 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3405 union sockaddr_46 inetd_sock;
3406 SOCKLEN_T size = sizeof(inetd_sock);
3407 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3409 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3410 if (family == AF_INET || family == AF_INET6)
3412 union sockaddr_46 interface_sock;
3413 size = sizeof(interface_sock);
3415 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3416 interface_address = host_ntoa(-1, &interface_sock, NULL,
3419 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3421 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3424 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3425 NULL, &sender_host_port);
3426 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3427 "inetd is not supported when mua_wrapper is set");
3432 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3433 return EXIT_FAILURE;
3439 /* If the load average is going to be needed while receiving a message, get it
3440 now for those OS that require the first call to os_getloadavg() to be done as
3441 root. There will be further calls later for each message received. */
3443 #ifdef LOAD_AVG_NEEDS_ROOT
3444 if (receiving_message &&
3445 (queue_only_load >= 0 ||
3446 (is_inetd && smtp_load_reserve >= 0)
3449 load_average = os_getloadavg();
3453 /* The queue_only configuration option can be overridden by -odx on the command
3454 line, except that if queue_only_override is false, queue_only cannot be unset
3455 from the command line. */
3457 if (queue_only_set && (queue_only_override || arg_queue_only))
3458 queue_only = arg_queue_only;
3460 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3463 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3464 if (arg_smtp_receive_timeout >= 0)
3465 smtp_receive_timeout = arg_smtp_receive_timeout;
3467 /* If Exim was started with root privilege, unless we have already removed the
3468 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3469 except when starting the daemon or doing some kind of delivery or address
3470 testing (-bt). These are the only cases when root need to be retained. We run
3471 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3472 retained only for starting the daemon. */
3474 if (!unprivileged && /* originally had root AND */
3475 !removed_privilege && /* still got root AND */
3476 !daemon_listen && /* not starting the daemon */
3477 queue_interval <= 0 && /* (either kind of daemon) */
3479 deliver_drop_privilege || /* requested unprivileged */
3481 queue_interval < 0 && /* not running the queue */
3482 (msg_action_arg < 0 || /* and */
3483 msg_action != MSG_DELIVER) && /* not delivering and */
3484 (!checking || !address_test_mode) /* not address checking */
3488 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3491 /* When we are retaining a privileged uid, we still change to the exim gid. */
3493 else setgid(exim_gid);
3495 /* Handle a request to list the delivery queue */
3499 set_process_info("listing the queue");
3500 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3504 /* Handle a request to count the delivery queue */
3508 set_process_info("counting the queue");
3513 /* Handle actions on specific messages, except for the force delivery action,
3514 which is done below. Some actions take a whole list of message ids, which
3515 are known to continue up to the end of the arguments. Others take a single
3516 message id and then operate on the recipients list. */
3518 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3520 int yield = EXIT_SUCCESS;
3521 set_process_info("acting on specified messages");
3523 if (!one_msg_action)
3525 for (i = msg_action_arg; i < argc; i++)
3526 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3527 yield = EXIT_FAILURE;
3530 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3531 recipients_arg)) yield = EXIT_FAILURE;
3535 /* All the modes below here require the remaining configuration sections
3536 to be read, except that we can skip over the ACL setting when delivering
3537 specific messages, or doing a queue run. (For various testing cases we could
3538 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3541 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3543 /* The configuration data will have been read into POOL_PERM because we won't
3544 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3545 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3546 configuration were read into POOL_MAIN, because we don't do any resets till
3547 later on. However, it seems right, and it does ensure that both pools get used.
3550 store_pool = POOL_MAIN;
3552 /* Handle the -brt option. This is for checking out retry configurations.
3553 The next three arguments are a domain name or a complete address, and
3554 optionally two error numbers. All it does is to call the function that
3555 scans the retry configuration data. */
3557 if (test_retry_arg >= 0)
3559 retry_config *yield;
3560 int basic_errno = 0;
3564 if (test_retry_arg >= argc)
3566 printf("-brt needs a domain or address argument\n");
3567 exim_exit(EXIT_FAILURE);
3569 s1 = argv[test_retry_arg++];
3572 /* If the first argument contains no @ and no . it might be a local user
3573 or it might be a single-component name. Treat as a domain. */
3575 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3577 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3578 "being \ntreated as a one-component domain, not as a local part.\n\n",
3582 /* There may be an optional second domain arg. */
3584 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3585 s2 = argv[test_retry_arg++];
3587 /* The final arg is an error name */
3589 if (test_retry_arg < argc)
3591 uschar *ss = argv[test_retry_arg];
3593 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3596 printf("%s\n", CS error);
3597 return EXIT_FAILURE;
3600 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3601 an error is for matching codes to the decade. Turn them into a real error
3602 code, off the decade. */
3604 if (basic_errno == ERRNO_RCPT4XX)
3606 int code = (more_errno >> 8) & 255;
3608 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3609 else if (code > 100)
3610 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3614 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3615 if (yield == NULL) printf("No retry information found\n"); else
3618 more_errno = yield->more_errno;
3619 printf("Retry rule: %s ", yield->pattern);
3621 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3623 printf("quota%s%s ",
3624 (more_errno > 0)? "_" : "",
3625 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3627 else if (yield->basic_errno == ECONNREFUSED)
3629 printf("refused%s%s ",
3630 (more_errno > 0)? "_" : "",
3631 (more_errno == 'M')? "MX" :
3632 (more_errno == 'A')? "A" : "");
3634 else if (yield->basic_errno == ETIMEDOUT)
3637 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3639 if (more_errno != 0) printf("_%s",
3640 (more_errno == 'M')? "MX" : "A");
3643 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3644 printf("auth_failed ");
3647 for (r = yield->rules; r != NULL; r = r->next)
3649 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3650 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3656 printf(",%d.", x/1000);
3670 exim_exit(EXIT_SUCCESS);
3673 /* Handle a request to list one or more configuration options */
3677 set_process_info("listing variables");
3678 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3679 else for (i = recipients_arg; i < argc; i++)
3682 (Ustrcmp(argv[i], "router") == 0 ||
3683 Ustrcmp(argv[i], "transport") == 0 ||
3684 Ustrcmp(argv[i], "authenticator") == 0))
3686 readconf_print(argv[i+1], argv[i]);
3689 else readconf_print(argv[i], NULL);
3691 exim_exit(EXIT_SUCCESS);
3695 /* Handle a request to deliver one or more messages that are already on the
3696 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3697 is typically used for a small number when prodding by hand (when the option
3698 forced_delivery will be set) or when re-execing to regain root privilege.
3699 Each message delivery must happen in a separate process, so we fork a process
3700 for each one, and run them sequentially so that debugging output doesn't get
3701 intertwined, and to avoid spawning too many processes if a long list is given.
3702 However, don't fork for the last one; this saves a process in the common case
3703 when Exim is called to deliver just one message. */
3705 if (msg_action_arg > 0)
3707 if (prod_requires_admin && !admin_user)
3709 fprintf(stderr, "exim: Permission denied\n");
3710 exim_exit(EXIT_FAILURE);
3712 set_process_info("delivering specified messages");
3713 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3714 for (i = msg_action_arg; i < argc; i++)
3719 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3720 else if ((pid = fork()) == 0)
3722 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3723 _exit(EXIT_SUCCESS);
3727 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3729 exim_exit(EXIT_FAILURE);
3733 exim_exit(EXIT_SUCCESS);
3737 /* If only a single queue run is requested, without SMTP listening, we can just
3738 turn into a queue runner, with an optional starting message id. */
3740 if (queue_interval == 0 && !daemon_listen)
3742 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3743 (start_queue_run_id == NULL)? US"" : US" starting at ",
3744 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3745 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3746 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3747 set_process_info("running the queue (single queue run)");
3748 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3749 exim_exit(EXIT_SUCCESS);
3753 /* Find the login name of the real user running this process. This is always
3754 needed when receiving a message, because it is written into the spool file. It
3755 may also be used to construct a from: or a sender: header, and in this case we
3756 need the user's full name as well, so save a copy of it, checked for RFC822
3757 syntax and munged if necessary, if it hasn't previously been set by the -F
3758 argument. We may try to get the passwd entry more than once, in case NIS or
3759 other delays are in evidence. Save the home directory for use in filter testing
3764 if ((pw = getpwuid(real_uid)) != NULL)
3766 originator_login = string_copy(US pw->pw_name);
3767 originator_home = string_copy(US pw->pw_dir);
3769 /* If user name has not been set by -F, set it from the passwd entry
3770 unless -f has been used to set the sender address by a trusted user. */
3772 if (originator_name == NULL)
3774 if (sender_address == NULL ||
3775 (!trusted_caller && filter_test == NULL))
3777 uschar *name = US pw->pw_gecos;
3778 uschar *amp = Ustrchr(name, '&');
3781 /* Most Unix specify that a '&' character in the gecos field is
3782 replaced by a copy of the login name, and some even specify that
3783 the first character should be upper cased, so that's what we do. */
3788 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3789 amp - name, name, &loffset, originator_login, amp + 1);
3790 buffer[loffset] = toupper(buffer[loffset]);
3794 /* If a pattern for matching the gecos field was supplied, apply
3795 it and then expand the name string. */
3797 if (gecos_pattern != NULL && gecos_name != NULL)
3800 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3802 if (regex_match_and_setup(re, name, 0, -1))
3804 uschar *new_name = expand_string(gecos_name);
3806 if (new_name != NULL)
3808 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3809 "gecos field \"%s\"\n", new_name, name);
3812 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3813 "\"%s\": %s\n", gecos_name, expand_string_message);
3815 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3816 "gecos field \"%s\"\n", gecos_pattern, name);
3817 store_free((void *)re);
3819 originator_name = string_copy(name);
3822 /* A trusted caller has used -f but not -F */
3824 else originator_name = US"";
3827 /* Break the retry loop */
3832 if (++i > finduser_retries) break;
3836 /* If we cannot get a user login, log the incident and give up, unless the
3837 configuration specifies something to use. When running in the test harness,
3838 any setting of unknown_login overrides the actual login name. */
3840 if (originator_login == NULL || running_in_test_harness)
3842 if (unknown_login != NULL)
3844 originator_login = expand_string(unknown_login);
3845 if (originator_name == NULL && unknown_username != NULL)
3846 originator_name = expand_string(unknown_username);
3847 if (originator_name == NULL) originator_name = US"";
3849 if (originator_login == NULL)
3850 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3854 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3857 originator_name = string_copy(parse_fix_phrase(originator_name,
3858 Ustrlen(originator_name), big_buffer, big_buffer_size));
3860 /* If a message is created by this call of Exim, the uid/gid of its originator
3861 are those of the caller. These values are overridden if an existing message is
3862 read in from the spool. */
3864 originator_uid = real_uid;
3865 originator_gid = real_gid;
3867 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3868 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3870 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3871 returns. We leave this till here so that the originator_ fields are available
3872 for incoming messages via the daemon. */
3874 if (daemon_listen || queue_interval > 0)
3876 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3877 "run when mua_wrapper is set");
3881 /* If the sender ident has not been set (by a trusted caller) set it to
3882 the caller. This will get overwritten below for an inetd call. If a trusted
3883 caller has set it empty, unset it. */
3885 if (sender_ident == NULL) sender_ident = originator_login;
3886 else if (sender_ident[0] == 0) sender_ident = NULL;
3888 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3889 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3890 originator_* variables set. */
3892 if (test_rewrite_arg >= 0)
3894 really_exim = FALSE;
3895 if (test_rewrite_arg >= argc)
3897 printf("-brw needs an address argument\n");
3898 exim_exit(EXIT_FAILURE);
3900 rewrite_test(argv[test_rewrite_arg]);
3901 exim_exit(EXIT_SUCCESS);
3904 /* A locally-supplied message is considered to be coming from a local user
3905 unless a trusted caller supplies a sender address with -f, or is passing in the
3906 message via SMTP (inetd invocation or otherwise). */
3908 if ((sender_address == NULL && !smtp_input) ||
3909 (!trusted_caller && filter_test == NULL))
3911 sender_local = TRUE;
3913 /* A trusted caller can supply authenticated_sender and authenticated_id
3914 via -oMas and -oMai and if so, they will already be set. */
3916 if (authenticated_sender == NULL)
3917 authenticated_sender = string_sprintf("%s@%s", originator_login,
3918 qualify_domain_sender);
3919 if (authenticated_id == NULL) authenticated_id = originator_login;
3922 /* Trusted callers are always permitted to specify the sender address.
3923 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3924 is specified is the empty address. However, if a trusted caller does not
3925 specify a sender address for SMTP input, we leave sender_address unset. This
3926 causes the MAIL commands to be honoured. */
3928 if ((!smtp_input && sender_address == NULL) ||
3929 !receive_check_set_sender(sender_address))
3931 /* Either the caller is not permitted to set a general sender, or this is
3932 non-SMTP input and the trusted caller has not set a sender. If there is no
3933 sender, or if a sender other than <> is set, override with the originator's
3934 login (which will get qualified below), except when checking things. */
3936 if (sender_address == NULL /* No sender_address set */
3938 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3939 !checking && /* Not running tests, AND */
3940 filter_test == NULL)) /* Not testing a filter */
3942 sender_address = originator_login;
3943 sender_address_forced = FALSE;
3944 sender_address_domain = 0;
3948 /* Remember whether an untrusted caller set the sender address */
3950 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3952 /* Ensure that the sender address is fully qualified unless it is the empty
3953 address, which indicates an error message, or doesn't exist (root caller, smtp
3954 interface, no -f argument). */
3956 if (sender_address != NULL && sender_address[0] != 0 &&
3957 sender_address_domain == 0)
3958 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
3959 qualify_domain_sender);
3961 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
3963 /* Handle a request to verify a list of addresses, or test them for delivery.
3964 This must follow the setting of the sender address, since routers can be
3965 predicated upon the sender. If no arguments are given, read addresses from
3966 stdin. Set debug_level to at least D_v to get full output for address testing.
3969 if (verify_address_mode || address_test_mode)
3972 int flags = vopt_qualify;
3974 if (verify_address_mode)
3976 if (!verify_as_sender) flags |= vopt_is_recipient;
3977 DEBUG(D_verify) debug_print_ids(US"Verifying:");
3982 flags |= vopt_is_recipient;
3983 debug_selector |= D_v;
3984 debug_file = stderr;
3985 debug_fd = fileno(debug_file);
3986 DEBUG(D_verify) debug_print_ids(US"Address testing:");
3989 if (recipients_arg < argc)
3991 while (recipients_arg < argc)
3993 uschar *s = argv[recipients_arg++];
3996 BOOL finished = FALSE;
3997 uschar *ss = parse_find_address_end(s, FALSE);
3998 if (*ss == ',') *ss = 0; else finished = TRUE;
3999 test_address(s, flags, &exit_value);
4002 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4009 uschar *s = get_stdinput(NULL, NULL);
4010 if (s == NULL) break;
4011 test_address(s, flags, &exit_value);
4015 exim_exit(exit_value);
4018 /* Handle expansion checking */
4022 if (recipients_arg < argc)
4024 while (recipients_arg < argc)
4026 uschar *s = argv[recipients_arg++];
4027 uschar *ss = expand_string(s);
4029 printf ("Failed: %s\n", expand_string_message);
4030 else printf("%s\n", CS ss);
4038 char *(*fn_readline)(char *) = NULL;
4039 char *(*fn_addhist)(char *) = NULL;
4042 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4048 uschar *source = get_stdinput(fn_readline, fn_addhist);
4049 if (source == NULL) break;
4050 ss = expand_string(source);
4052 printf ("Failed: %s\n", expand_string_message);
4053 else printf("%s\n", CS ss);
4057 if (dlhandle != NULL) dlclose(dlhandle);
4061 exim_exit(EXIT_SUCCESS);
4065 /* The active host name is normally the primary host name, but it can be varied
4066 for hosts that want to play several parts at once. We need to ensure that it is
4067 set for host checking, and for receiving messages. */
4069 smtp_active_hostname = primary_hostname;
4070 if (raw_active_hostname != NULL)
4072 uschar *nah = expand_string(raw_active_hostname);
4075 if (!expand_string_forcedfail)
4076 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4077 "(smtp_active_hostname): %s", raw_active_hostname,
4078 expand_string_message);
4080 else if (nah[0] != 0) smtp_active_hostname = nah;
4083 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4084 given IP address so that the blocking and relay configuration can be tested. An
4085 RFC 1413 call is made only if we are running in the test harness and an
4086 incoming interface and both ports are specified, because there is no TCP/IP
4087 call to find the ident for. */
4091 sender_ident = NULL;
4092 if (running_in_test_harness && sender_host_port != 0 &&
4093 interface_address != NULL && interface_port != 0)
4094 verify_get_ident(1413);
4096 host_build_sender_fullhost();
4100 sender_local = FALSE;
4101 sender_host_notsocket = TRUE;
4102 debug_file = stderr;
4103 debug_fd = fileno(debug_file);
4104 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4105 "**** but without any ident (RFC 1413) callback.\n"
4106 "**** This is not for real!\n\n",
4107 sender_host_address);
4109 if (verify_check_host(&hosts_connection_nolog) == OK)
4110 log_write_selector &= ~L_smtp_connection;
4111 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4113 if (smtp_start_session())
4115 reset_point = store_get(0);
4118 store_reset(reset_point);
4119 if (smtp_setup_msg() <= 0) break;
4120 if (!receive_msg(FALSE)) break;
4123 exim_exit(EXIT_SUCCESS);
4127 /* Arrange for message reception if recipients or SMTP were specified;
4128 otherwise complain unless a version print (-bV) happened or this is a filter
4129 verification test. In the former case, show the configuration file name. */
4131 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4133 if (version_printed)
4135 printf("Configuration file is %s\n", config_main_filename);
4136 return EXIT_SUCCESS;
4138 if (filter_test == NULL)
4141 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4142 "not directly from a shell command line. Options and/or arguments control\n"
4143 "what it does when called. For a list of options, see the Exim documentation.\n");
4144 return EXIT_FAILURE;
4149 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4150 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4151 that we are not called from inetd, because that is rejected above. The
4152 following configuration settings are forced here:
4154 (1) Synchronous delivery (-odi)
4155 (2) Errors to stderr (-oep == -oeq)
4156 (3) No parallel remote delivery
4157 (4) Unprivileged delivery
4159 We don't force overall queueing options because there are several of them;
4160 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4161 to override any SMTP queueing. */
4165 synchronous_delivery = TRUE;
4166 arg_error_handling = ERRORS_STDERR;
4167 remote_max_parallel = 1;
4168 deliver_drop_privilege = TRUE;
4170 queue_smtp_domains = NULL;
4174 /* Prepare to accept one or more new messages on the standard input. When a
4175 message has been read, its id is returned in message_id[]. If doing immediate
4176 delivery, we fork a delivery process for each received message, except for the
4177 last one, where we can save a process switch.
4179 It is only in non-smtp mode that error_handling is allowed to be changed from
4180 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4181 sendmail error modes other than -oem ever actually used? Later: yes.) */
4183 if (!smtp_input) error_handling = arg_error_handling;
4185 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4186 logging being sent down the socket and make an identd call to get the
4192 exim_nullstd(); /* Re-open to /dev/null */
4193 verify_get_ident(IDENT_PORT);
4194 host_build_sender_fullhost();
4195 set_process_info("handling incoming connection from %s via inetd",
4199 /* If the sender host address has been set, build sender_fullhost if it hasn't
4200 already been done (which it will have been for inetd). This caters for the
4201 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4202 so that the test for IP options is skipped for -bs input. */
4204 if (sender_host_address != NULL && sender_fullhost == NULL)
4206 host_build_sender_fullhost();
4207 set_process_info("handling incoming connection from %s via -oMa",
4209 sender_host_notsocket = TRUE;
4212 /* Otherwise, set the sender host as unknown except for inetd calls. This
4213 prevents host checking in the case of -bs not from inetd and also for -bS. */
4215 else if (!is_inetd) sender_host_unknown = TRUE;
4217 /* If stdout does not exist, then dup stdin to stdout. This can happen
4218 if exim is started from inetd. In this case fd 0 will be set to the socket,
4219 but fd 1 will not be set. This also happens for passed SMTP channels. */
4221 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4223 /* Set up the incoming protocol name and the state of the program. Root
4224 is allowed to force received protocol via the -oMr option above, and if we are
4225 in a non-local SMTP state it means we have come via inetd and the process info
4226 has already been set up. We don't set received_protocol here for smtp input,
4227 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4231 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4236 if (received_protocol == NULL)
4237 received_protocol = string_sprintf("local%s", called_as);
4238 set_process_info("accepting a local non-SMTP message from <%s>",
4242 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4246 local_queue_only = queue_only;
4248 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4249 the spool if so configured. On failure, we must not attempt to send an error
4250 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4251 error code is given.) */
4253 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4255 fprintf(stderr, "exim: insufficient disk space\n");
4256 return EXIT_FAILURE;
4259 /* If this is smtp input of any kind, handle the start of the SMTP
4266 if (verify_check_host(&hosts_connection_nolog) == OK)
4267 log_write_selector &= ~L_smtp_connection;
4268 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4269 if (!smtp_start_session())
4272 exim_exit(EXIT_SUCCESS);
4276 /* Otherwise, set up the input size limit here */
4280 thismessage_size_limit = expand_string_integer(message_size_limit);
4281 if (thismessage_size_limit < 0)
4283 if (thismessage_size_limit == -1)
4284 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4285 "message_size_limit: %s", expand_string_message);
4287 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4288 "message_size_limit: %s", expand_string_message);
4292 /* Loop for several messages when reading SMTP input. If we fork any child
4293 processes, we don't want to wait for them unless synchronous delivery is
4294 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4295 same as SIG_DFL, despite the fact that documentation often lists the default as
4296 "ignore". This is a confusing area. This is what I know:
4298 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4299 processes that complete simply to go away without ever becoming defunct. You
4300 can't then wait for them - but we don't want to wait for them in the
4301 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4302 happen for all OS (e.g. *BSD is different).
4304 But that's not the end of the story. Some (many? all?) systems have the
4305 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4306 has by default, so it seems that the difference is merely one of default
4307 (compare restarting vs non-restarting signals).
4309 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4310 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4311 of the loop below. Paranoia rules.
4313 February 2003: That's *still* not the end of the story. There are now versions
4314 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4315 process then calls waitpid(), a grumble is written to the system log, because
4316 this is logically inconsistent. In other words, it doesn't like the paranoia.
4317 As a consequenc of this, the waitpid() below is now excluded if we are sure
4318 that SIG_IGN works. */
4320 if (!synchronous_delivery)
4323 struct sigaction act;
4324 act.sa_handler = SIG_IGN;
4325 sigemptyset(&(act.sa_mask));
4326 act.sa_flags = SA_NOCLDWAIT;
4327 sigaction(SIGCHLD, &act, NULL);
4329 signal(SIGCHLD, SIG_IGN);
4333 /* Save the current store pool point, for resetting at the start of
4334 each message, and save the real sender address, if any. */
4336 reset_point = store_get(0);
4337 real_sender_address = sender_address;
4339 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4340 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4345 store_reset(reset_point);
4348 /* In the SMTP case, we have to handle the initial SMTP input and build the
4349 recipients list, before calling receive_msg() to read the message proper.
4350 Whatever sender address is actually given in the SMTP transaction is
4351 actually ignored for local senders - we use the actual sender, which is
4352 normally either the underlying user running this process or a -f argument
4353 provided by a trusted caller. It is saved in real_sender_address.
4355 However, if this value is NULL, we are dealing with a trusted caller when
4356 -f was not used; in this case, the SMTP sender is allowed to stand.
4358 Also, if untrusted_set_sender is set, we permit sender addresses that match
4359 anything in its list.
4361 The variable raw_sender_address holds the sender address before rewriting. */
4366 if ((rc = smtp_setup_msg()) > 0)
4368 if (real_sender_address != NULL &&
4369 !receive_check_set_sender(sender_address))
4371 sender_address = raw_sender = real_sender_address;
4372 sender_address_unrewritten = NULL;
4374 more = receive_msg(extract_recipients);
4375 if (message_id[0] == 0)
4378 exim_exit(EXIT_FAILURE);
4381 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4384 /* In the non-SMTP case, we have all the information from the command
4385 line, but must process it in case it is in the more general RFC822
4386 format, and in any case, to detect syntax errors. Also, it appears that
4387 the use of comma-separated lists as single arguments is common, so we
4388 had better support them. */
4394 int count = argc - recipients_arg;
4395 uschar **list = argv + recipients_arg;
4397 /* These options cannot be changed dynamically for non-SMTP messages */
4399 active_local_sender_retain = local_sender_retain;
4400 active_local_from_check = local_from_check;
4402 /* Save before any rewriting */
4404 raw_sender = string_copy(sender_address);
4406 /* Loop for each argument */
4408 for (i = 0; i < count; i++)
4410 int start, end, domain;
4412 uschar *s = list[i];
4414 /* Loop for each comma-separated address */
4418 BOOL finished = FALSE;
4420 uschar *ss = parse_find_address_end(s, FALSE);
4422 if (*ss == ',') *ss = 0; else finished = TRUE;
4424 /* Check max recipients - if -t was used, these aren't recipients */
4426 if (recipients_max > 0 && ++rcount > recipients_max &&
4427 !extract_recipients)
4429 if (error_handling == ERRORS_STDERR)
4431 fprintf(stderr, "exim: too many recipients\n");
4432 exim_exit(EXIT_FAILURE);
4437 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4438 errors_sender_rc : EXIT_FAILURE;
4443 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4445 if (domain == 0 && !allow_unqualified_recipient)
4448 errmess = US"unqualified recipient address not allowed";
4451 if (recipient == NULL)
4453 if (error_handling == ERRORS_STDERR)
4455 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4456 string_printing(list[i]), errmess);
4457 exim_exit(EXIT_FAILURE);
4463 eblock.text1 = string_printing(list[i]);
4464 eblock.text2 = errmess;
4466 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4467 errors_sender_rc : EXIT_FAILURE;
4471 receive_add_recipient(recipient, -1);
4474 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4478 /* Show the recipients when debugging */
4483 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4484 if (recipients_list != NULL)
4486 debug_printf("Recipients:\n");
4487 for (i = 0; i < recipients_count; i++)
4488 debug_printf(" %s\n", recipients_list[i].address);
4492 /* Read the data for the message. If filter_test is true, this will
4493 just read the headers for the message, and not write anything onto
4496 message_ended = END_NOTENDED;
4497 more = receive_msg(extract_recipients);
4499 /* more is always FALSE here (not SMTP message) when reading a message
4500 for real; when reading the headers of a message for filter testing,
4501 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4503 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4504 } /* Non-SMTP message reception */
4506 /* If this is a filter testing run, there are headers in store, but
4507 no message on the spool. Run the filtering code in testing mode, setting
4508 the domain to the qualify domain and the local part to the current user,
4509 unless they have been set by options. The prefix and suffix are left unset
4510 unless specified. The the return path is set to to the sender unless it has
4511 already been set from a return-path header in the message. */
4513 if (filter_test != NULL)
4515 deliver_domain = (ftest_domain != NULL)?
4516 ftest_domain : qualify_domain_recipient;
4517 deliver_domain_orig = deliver_domain;
4518 deliver_localpart = (ftest_localpart != NULL)?
4519 ftest_localpart : originator_login;
4520 deliver_localpart_orig = deliver_localpart;
4521 deliver_localpart_prefix = ftest_prefix;
4522 deliver_localpart_suffix = ftest_suffix;
4523 deliver_home = originator_home;
4525 if (return_path == NULL)
4527 printf("Return-path copied from sender\n");
4528 return_path = string_copy(sender_address);
4532 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4534 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4536 receive_add_recipient(
4537 string_sprintf("%s%s%s@%s",
4538 (ftest_prefix == NULL)? US"" : ftest_prefix,
4540 (ftest_suffix == NULL)? US"" : ftest_suffix,
4541 deliver_domain), -1);
4543 printf("Recipient = %s\n", recipients_list[0].address);
4544 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4545 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4547 chdir("/"); /* Get away from wherever the user is running this from */
4548 exim_exit(filter_runtest(filter_fd, ftest_system, more)?
4549 EXIT_SUCCESS : EXIT_FAILURE);
4552 /* Else act on the result of message reception. We should not get here unless
4553 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4554 TRUE. If it is not, check on the number of messages received in this
4555 connection. If that's OK and queue_only_load is set, check that the load
4556 average is below it. If it is not, set local_queue_only TRUE. Note that it
4557 then remains this way for any subsequent messages on the same SMTP connection.
4558 This is a deliberate choice; even though the load average may fall, it
4559 doesn't seem right to deliver later messages on the same call when not
4560 delivering earlier ones. */
4562 if (!local_queue_only)
4564 if (smtp_accept_queue_per_connection > 0 &&
4565 receive_messagecount > smtp_accept_queue_per_connection)
4567 local_queue_only = TRUE;
4568 queue_only_reason = 2;
4570 else if (queue_only_load >= 0)
4572 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4573 if (local_queue_only) queue_only_reason = 3;
4577 /* If running as an MUA wrapper, all queueing options and freezing options
4581 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4583 /* Log the queueing here, when it will get a message id attached, but
4584 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4587 if (local_queue_only) switch(queue_only_reason)
4590 log_write(L_delay_delivery,
4591 LOG_MAIN, "no immediate delivery: more than %d messages "
4592 "received in one connection", smtp_accept_queue_per_connection);
4596 log_write(L_delay_delivery,
4597 LOG_MAIN, "no immediate delivery: load average %.2f",
4598 (double)load_average/1000.0);
4602 /* Else do the delivery unless the ACL or local_scan() called for queue only
4603 or froze the message. Always deliver in a separate process. A fork failure is
4604 not a disaster, as the delivery will eventually happen on a subsequent queue
4605 run. The search cache must be tidied before the fork, as the parent will
4606 do it before exiting. The child will trigger a lookup failure and
4607 thereby defer the delivery if it tries to use (for example) a cached ldap
4608 connection that the parent has called unbind on. */
4610 else if (!queue_only_policy && !deliver_freeze)
4615 if ((pid = fork()) == 0)
4618 close_unwanted(); /* Close unwanted file descriptors and TLS */
4619 exim_nullstd(); /* Ensure std{in,out,err} exist */
4621 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4622 mode, deliver_drop_privilege is forced TRUE). */
4624 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4626 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4628 /* Control does not return here. */
4631 /* No need to re-exec */
4633 rc = deliver_message(message_id, FALSE, FALSE);
4635 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4636 EXIT_SUCCESS : EXIT_FAILURE);
4641 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4642 "process: %s", strerror(errno));
4645 /* In the parent, wait if synchronous delivery is required. This will
4646 always be the case in MUA wrapper mode. */
4648 else if (synchronous_delivery)
4651 while (wait(&status) != pid);
4652 if ((status & 0x00ff) != 0)
4653 log_write(0, LOG_MAIN|LOG_PANIC,
4654 "process %d crashed with signal %d while delivering %s",
4655 (int)pid, status & 0x00ff, message_id);
4656 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4660 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4661 automatically reaps children (see comments above the loop), clear away any
4662 finished subprocesses here, in case there are lots of messages coming in
4663 from the same source. */
4665 #ifndef SIG_IGN_WORKS
4666 while (waitpid(-1, NULL, WNOHANG) > 0);
4670 exim_exit(EXIT_SUCCESS); /* Never returns */
4671 return 0; /* To stop compiler warning */