1 /* $Cambridge: exim/src/src/exim.c,v 1.8 2004/11/10 10:29:56 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-op, retained for compatibility only. If -dd is used,
1867 debugging subprocesses of the daemon is disabled. */
1870 if (Ustrcmp(argrest, "ropcr") == 0)
1872 /* drop_cr = TRUE; */
1875 /* Use an intermediate variable so that we don't set debugging while
1876 decoding the debugging bits. */
1880 unsigned int selector = D_default;
1883 if (*argrest == 'd')
1885 debug_daemon = TRUE;
1889 decode_bits(&selector, NULL, argrest, debug_options,
1890 debug_options_count, US"debug");
1891 debug_selector = selector;
1896 /* -E: This is a local error message. This option is not intended for
1897 external use at all, but is not restricted to trusted callers because it
1898 does no harm (just suppresses certain error messages) and if Exim is run
1899 not setuid root it won't always be trusted when it generates error
1900 messages using this option. If there is a message id following -E, point
1901 message_reference at it, for logging. */
1904 local_error_message = TRUE;
1905 if (mac_ismsgid(argrest)) message_reference = argrest;
1909 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1910 option, so it looks as if historically the -oex options are also callable
1911 without the leading -o. So we have to accept them. Before the switch,
1912 anything starting -oe has been converted to -e. Exim does not support all
1913 of the sendmail error options. */
1916 if (Ustrcmp(argrest, "e") == 0)
1918 arg_error_handling = ERRORS_SENDER;
1919 errors_sender_rc = EXIT_SUCCESS;
1921 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1922 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1923 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1924 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1929 /* -F: Set sender's full name, used instead of the gecos entry from
1930 the password file. Since users can usually alter their gecos entries,
1931 there's no security involved in using this instead. The data can follow
1932 the -F or be in the next argument. */
1937 if(++i < argc) argrest = argv[i]; else
1938 { badarg = TRUE; break; }
1940 originator_name = argrest;
1944 /* -f: Set sender's address - this value is only actually used if Exim is
1945 run by a trusted user, or if untrusted_set_sender is set and matches the
1946 address, except that the null address can always be set by any user. The
1947 test for this happens later, when the value given here is ignored when not
1948 permitted. For an untrusted user, the actual sender is still put in Sender:
1949 if it doesn't match the From: header (unless no_local_from_check is set).
1950 The data can follow the -f or be in the next argument. The -r switch is an
1951 obsolete form of -f but since there appear to be programs out there that
1952 use anything that sendmail has ever supported, better accept it - the
1953 synonymizing is done before the switch above.
1955 At this stage, we must allow domain literal addresses, because we don't
1956 know what the setting of allow_domain_literals is yet. Ditto for trailing
1957 dots and strip_trailing_dot. */
1965 if (i+1 < argc) argrest = argv[++i]; else
1966 { badarg = TRUE; break; }
1970 sender_address = string_sprintf(""); /* Ensure writeable memory */
1974 uschar *temp = argrest + Ustrlen(argrest) - 1;
1975 while (temp >= argrest && isspace(*temp)) temp--;
1976 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
1977 allow_domain_literals = TRUE;
1978 strip_trailing_dot = TRUE;
1979 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
1980 &sender_address_domain, TRUE);
1981 allow_domain_literals = FALSE;
1982 strip_trailing_dot = FALSE;
1983 if (sender_address == NULL)
1985 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
1986 return EXIT_FAILURE;
1989 sender_address_forced = TRUE;
1993 /* This is some Sendmail thing which can be ignored */
1998 /* -h: Set the hop count for an incoming message. Exim does not currently
1999 support this; it always computes it by counting the Received: headers.
2000 To put it in will require a change to the spool header file format. */
2005 if(++i < argc) argrest = argv[i]; else
2006 { badarg = TRUE; break; }
2008 if (!isdigit(*argrest)) badarg = TRUE;
2012 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2013 not to be documented for sendmail but mailx (at least) uses it) */
2016 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2021 receiving_message = FALSE;
2023 /* -MC: continue delivery of another message via an existing open
2024 file descriptor. This option is used for an internal call by the
2025 smtp transport when there is a pending message waiting to go to an
2026 address to which it has got a connection. Five subsequent arguments are
2027 required: transport name, host name, IP address, sequence number, and
2028 message_id. Transports may decline to create new processes if the sequence
2029 number gets too big. The channel is stdin. This (-MC) must be the last
2030 argument. There's a subsequent check that the real-uid is privileged.
2032 If we are running in the test harness. delay for a bit, to let the process
2033 that set this one up complete. This makes for repeatability of the logging,
2036 if (Ustrcmp(argrest, "C") == 0)
2040 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2041 return EXIT_FAILURE;
2044 if (msg_action_arg >= 0)
2046 fprintf(stderr, "exim: incompatible arguments\n");
2047 return EXIT_FAILURE;
2050 continue_transport = argv[++i];
2051 continue_hostname = argv[++i];
2052 continue_host_address = argv[++i];
2053 continue_sequence = Uatoi(argv[++i]);
2054 msg_action = MSG_DELIVER;
2055 msg_action_arg = ++i;
2056 forced_delivery = TRUE;
2057 queue_run_pid = passed_qr_pid;
2058 queue_run_pipe = passed_qr_pipe;
2060 if (!mac_ismsgid(argv[i]))
2062 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2064 return EXIT_FAILURE;
2067 if (running_in_test_harness) millisleep(500);
2071 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2072 precedes -MC (see above). The flag indicates that the host to which
2073 Exim is connected has accepted an AUTH sequence. */
2075 else if (Ustrcmp(argrest, "CA") == 0)
2077 smtp_authenticated = TRUE;
2081 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2082 it preceded -MC (see above) */
2084 else if (Ustrcmp(argrest, "CP") == 0)
2086 smtp_use_pipelining = TRUE;
2090 /* -MCQ: pass on the pid of the queue-running process that started
2091 this chain of deliveries and the fd of its synchronizing pipe; this
2092 is useful only when it precedes -MC (see above) */
2094 else if (Ustrcmp(argrest, "CQ") == 0)
2096 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2098 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2103 /* -MCS: set the smtp_use_size flag; this is useful only when it
2104 precedes -MC (see above) */
2106 else if (Ustrcmp(argrest, "CS") == 0)
2108 smtp_use_size = TRUE;
2112 /* -MCT: set the tls_offered flag; this is useful only when it
2113 precedes -MC (see above). The flag indicates that the host to which
2114 Exim is connected has offered TLS support. */
2117 else if (Ustrcmp(argrest, "CT") == 0)
2124 /* -M[x]: various operations on the following list of message ids:
2125 -M deliver the messages, ignoring next retry times and thawing
2126 -Mc deliver the messages, checking next retry times, no thawing
2127 -Mf freeze the messages
2128 -Mg give up on the messages
2129 -Mt thaw the messages
2130 -Mrm remove the messages
2131 In the above cases, this must be the last option. There are also the
2132 following options which are followed by a single message id, and which
2133 act on that message. Some of them use the "recipient" addresses as well.
2134 -Mar add recipient(s)
2135 -Mmad mark all recipients delivered
2136 -Mmd mark recipients(s) delivered
2143 else if (*argrest == 0)
2145 msg_action = MSG_DELIVER;
2146 forced_delivery = deliver_force_thaw = TRUE;
2148 else if (Ustrcmp(argrest, "ar") == 0)
2150 msg_action = MSG_ADD_RECIPIENT;
2151 one_msg_action = TRUE;
2153 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2154 else if (Ustrcmp(argrest, "es") == 0)
2156 msg_action = MSG_EDIT_SENDER;
2157 one_msg_action = TRUE;
2159 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2160 else if (Ustrcmp(argrest, "g") == 0)
2162 msg_action = MSG_DELIVER;
2163 deliver_give_up = TRUE;
2165 else if (Ustrcmp(argrest, "mad") == 0)
2167 msg_action = MSG_MARK_ALL_DELIVERED;
2169 else if (Ustrcmp(argrest, "md") == 0)
2171 msg_action = MSG_MARK_DELIVERED;
2172 one_msg_action = TRUE;
2174 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2175 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2176 else if (Ustrcmp(argrest, "vb") == 0)
2178 msg_action = MSG_SHOW_BODY;
2179 one_msg_action = TRUE;
2181 else if (Ustrcmp(argrest, "vh") == 0)
2183 msg_action = MSG_SHOW_HEADER;
2184 one_msg_action = TRUE;
2186 else if (Ustrcmp(argrest, "vl") == 0)
2188 msg_action = MSG_SHOW_LOG;
2189 one_msg_action = TRUE;
2191 else { badarg = TRUE; break; }
2193 /* All the -Mxx options require at least one message id. */
2195 msg_action_arg = i + 1;
2196 if (msg_action_arg >= argc)
2198 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2199 return EXIT_FAILURE;
2202 /* Some require only message ids to follow */
2204 if (!one_msg_action)
2207 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2209 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2211 return EXIT_FAILURE;
2213 goto END_ARG; /* Remaining args are ids */
2216 /* Others require only one message id, possibly followed by addresses,
2217 which will be handled as normal arguments. */
2221 if (!mac_ismsgid(argv[msg_action_arg]))
2223 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2224 argv[msg_action_arg], arg);
2225 return EXIT_FAILURE;
2232 /* Some programs seem to call the -om option without the leading o;
2233 for sendmail it askes for "me too". Exim always does this. */
2236 if (*argrest != 0) badarg = TRUE;
2240 /* -N: don't do delivery - a debugging option that stops transports doing
2241 their thing. It implies debugging at the D_v level. */
2246 dont_deliver = TRUE;
2247 debug_selector |= D_v;
2248 debug_file = stderr;
2254 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2260 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2261 option to the specified value. This form uses long names. We need to handle
2262 -O option=value and -Ooption=value. */
2269 fprintf(stderr, "exim: string expected after -O\n");
2277 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2280 if (*argrest == 'A')
2282 alias_arg = argrest + 1;
2283 if (alias_arg[0] == 0)
2285 if (i+1 < argc) alias_arg = argv[++i]; else
2287 fprintf(stderr, "exim: string expected after -oA\n");
2293 /* -oB: Set a connection message max value for remote deliveries */
2295 else if (*argrest == 'B')
2297 uschar *p = argrest + 1;
2300 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2302 connection_max_messages = 1;
2311 fprintf(stderr, "exim: number expected after -oB\n");
2314 connection_max_messages = Uatoi(p);
2318 /* -odb: background delivery */
2320 else if (Ustrcmp(argrest, "db") == 0)
2322 synchronous_delivery = FALSE;
2323 arg_queue_only = FALSE;
2324 queue_only_set = TRUE;
2327 /* -odf: foreground delivery (smail-compatible option); same effect as
2328 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2331 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2333 synchronous_delivery = TRUE;
2334 arg_queue_only = FALSE;
2335 queue_only_set = TRUE;
2338 /* -odq: queue only */
2340 else if (Ustrcmp(argrest, "dq") == 0)
2342 synchronous_delivery = FALSE;
2343 arg_queue_only = TRUE;
2344 queue_only_set = TRUE;
2347 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2348 but no remote delivery */
2350 else if (Ustrcmp(argrest, "dqs") == 0)
2353 arg_queue_only = FALSE;
2354 queue_only_set = TRUE;
2357 /* -oex: Sendmail error flags. As these are also accepted without the
2358 leading -o prefix, for compatibility with vacation and other callers,
2359 they are handled with -e above. */
2361 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2362 -oitrue: Another sendmail syntax for the same */
2364 else if (Ustrcmp(argrest, "i") == 0 ||
2365 Ustrcmp(argrest, "itrue") == 0)
2368 /* -oM*: Set various characteristics for an incoming message; actually
2369 acted on for trusted callers only. */
2371 else if (*argrest == 'M')
2375 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2379 /* -oMa: Set sender host address */
2381 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2383 /* -oMaa: Set authenticator name */
2385 else if (Ustrcmp(argrest, "Maa") == 0)
2386 sender_host_authenticated = argv[++i];
2388 /* -oMas: setting authenticated sender */
2390 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2392 /* -oMai: setting authenticated id */
2394 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2396 /* -oMi: Set incoming interface address */
2398 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2400 /* -oMr: Received protocol */
2402 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2404 /* -oMs: Set sender host name */
2406 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2408 /* -oMt: Set sender ident */
2410 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2412 /* Else a bad argument */
2421 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2422 seem to call this as -m (undocumented), so that is also accepted (see
2425 else if (Ustrcmp(argrest, "m") == 0) {}
2427 /* -oo: An ancient flag for old-style addresses which still seems to
2428 crop up in some calls (see in SCO). */
2430 else if (Ustrcmp(argrest, "o") == 0) {}
2432 /* -oP <name>: set pid file path for daemon */
2434 else if (Ustrcmp(argrest, "P") == 0)
2435 override_pid_file_path = argv[++i];
2437 /* -or <n>: set timeout for non-SMTP acceptance
2438 -os <n>: set timeout for SMTP acceptance */
2440 else if (*argrest == 'r' || *argrest == 's')
2442 int *tp = (*argrest == 'r')?
2443 &arg_receive_timeout : &arg_smtp_receive_timeout;
2444 if (argrest[1] == 0)
2446 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2448 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2451 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2456 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2458 else if (Ustrcmp(argrest, "X") == 0)
2459 override_local_interfaces = argv[++i];
2461 /* Unknown -o argument */
2467 /* -ps: force Perl startup; -pd force delayed Perl startup */
2471 if (*argrest == 's' && argrest[1] == 0)
2473 perl_start_option = 1;
2476 if (*argrest == 'd' && argrest[1] == 0)
2478 perl_start_option = -1;
2483 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2484 which sets the host protocol and host name */
2488 if (i+1 < argc) argrest = argv[++i]; else
2489 { badarg = TRUE; break; }
2494 uschar *hn = Ustrchr(argrest, ':');
2497 received_protocol = argrest;
2501 received_protocol = string_copyn(argrest, hn - argrest);
2502 sender_host_name = hn + 1;
2509 receiving_message = FALSE;
2511 /* -qq...: Do queue runs in a 2-stage manner */
2513 if (*argrest == 'q')
2515 queue_2stage = TRUE;
2519 /* -qi...: Do only first (initial) deliveries */
2521 if (*argrest == 'i')
2523 queue_run_first_delivery = TRUE;
2527 /* -qf...: Run the queue, forcing deliveries
2528 -qff..: Ditto, forcing thawing as well */
2530 if (*argrest == 'f')
2532 queue_run_force = TRUE;
2533 if (*(++argrest) == 'f')
2535 deliver_force_thaw = TRUE;
2540 /* -q[f][f]l...: Run the queue only on local deliveries */
2542 if (*argrest == 'l')
2544 queue_run_local = TRUE;
2548 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2549 optionally starting from a given message id. */
2551 if (*argrest == 0 &&
2552 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2555 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2556 start_queue_run_id = argv[++i];
2557 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2558 stop_queue_run_id = argv[++i];
2561 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2562 optionally local only. */
2567 queue_interval = readconf_readtime(argrest, 0, FALSE);
2569 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2570 if (queue_interval <= 0)
2572 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2579 case 'R': /* Synonymous with -qR... */
2580 receiving_message = FALSE;
2582 /* -Rf: As -R (below) but force all deliveries,
2583 -Rff: Ditto, but also thaw all frozen messages,
2584 -Rr: String is regex
2585 -Rrf: Regex and force
2586 -Rrff: Regex and force and thaw
2588 in all cases provided there are no further characters in this
2594 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2596 if (Ustrcmp(argrest, rsopts[i]) == 0)
2598 if (i != 2) queue_run_force = TRUE;
2599 if (i >= 2) deliver_selectstring_regex = TRUE;
2600 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2601 argrest += Ustrlen(rsopts[i]);
2606 /* -R: Set string to match in addresses for forced queue run to
2607 pick out particular messages. */
2611 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2613 fprintf(stderr, "exim: string expected after -R\n");
2617 else deliver_selectstring = argrest;
2618 if (queue_interval < 0) queue_interval = 0;
2622 /* -r: an obsolete synonym for -f (see above) */
2625 /* -S: Like -R but works on sender. */
2627 case 'S': /* Synonymous with -qS... */
2628 receiving_message = FALSE;
2630 /* -Sf: As -S (below) but force all deliveries,
2631 -Sff: Ditto, but also thaw all frozen messages,
2632 -Sr: String is regex
2633 -Srf: Regex and force
2634 -Srff: Regex and force and thaw
2636 in all cases provided there are no further characters in this
2642 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2644 if (Ustrcmp(argrest, rsopts[i]) == 0)
2646 if (i != 2) queue_run_force = TRUE;
2647 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2648 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2649 argrest += Ustrlen(rsopts[i]);
2654 /* -S: Set string to match in addresses for forced queue run to
2655 pick out particular messages. */
2659 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2661 fprintf(stderr, "exim: string expected after -S\n");
2665 else deliver_selectstring_sender = argrest;
2666 if (queue_interval < 0) queue_interval = 0;
2669 /* -Tqt is an option that is exclusively for use by the testing suite.
2670 It is not recognized in other circumstances. It allows for the setting up
2671 of explicit "queue times" so that various warning/retry things can be
2672 tested. Otherwise variability of clock ticks etc. cause problems. */
2675 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2676 fudged_queue_times = argv[++i];
2681 /* -t: Set flag to extract recipients from body of message. */
2684 if (*argrest == 0) extract_recipients = TRUE;
2686 /* -ti: Set flag to extract recipients from body of message, and also
2687 specify that dot does not end the message. */
2689 else if (Ustrcmp(argrest, "i") == 0)
2691 extract_recipients = TRUE;
2695 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2698 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2705 /* -U: This means "initial user submission" in sendmail, apparently. The
2706 doc claims that in future sendmail may refuse syntactically invalid
2707 messages instead of fixing them. For the moment, we just ignore it. */
2713 /* -v: verify things - this is a very low-level debugging */
2718 debug_selector |= D_v;
2719 debug_file = stderr;
2725 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2727 The -x flag tells the sendmail command that mail from a local
2728 mail program has National Language Support (NLS) extended characters
2729 in the body of the mail item. The sendmail command can send mail with
2730 extended NLS characters across networks that normally corrupts these
2733 As Exim is 8-bit clean, it just ignores this flag. */
2736 if (*argrest != 0) badarg = TRUE;
2739 /* All other initial characters are errors */
2744 } /* End of high-level switch statement */
2746 /* Failed to recognize the option, or syntax error */
2750 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2751 "option %s\n", arg);
2757 /* Arguments have been processed. Check for incompatibilities. */
2761 (smtp_input || extract_recipients || recipients_arg < argc) &&
2762 (daemon_listen || queue_interval >= 0 || bi_option ||
2763 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2764 filter_test != NULL || (msg_action_arg > 0 && !one_msg_action))
2767 msg_action_arg > 0 &&
2768 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2769 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2772 (daemon_listen || queue_interval >= 0) &&
2773 (sender_address != NULL || list_options || list_queue || checking ||
2777 daemon_listen && queue_interval == 0
2781 (checking || smtp_input || extract_recipients ||
2782 filter_test != NULL || bi_option)
2785 verify_address_mode &&
2786 (address_test_mode || smtp_input || extract_recipients ||
2787 filter_test != NULL || bi_option)
2790 address_test_mode && (smtp_input || extract_recipients ||
2791 filter_test != NULL || bi_option)
2794 smtp_input && (sender_address != NULL || filter_test != NULL ||
2798 deliver_selectstring != NULL && queue_interval < 0
2802 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2806 /* If debugging is set up, set the file and the file descriptor to pass on to
2807 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2808 to run in the foreground. */
2810 if (debug_selector != 0)
2812 debug_file = stderr;
2813 debug_fd = fileno(debug_file);
2814 background_daemon = FALSE;
2815 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2816 if (debug_selector != D_v) /* -v only doesn't show this */
2818 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2819 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2821 show_whats_supported(stderr);
2825 /* When started with root privilege, ensure that the limits on the number of
2826 open files and the number of processes (where that is accessible) are
2827 sufficiently large, or are unset, in case Exim has been called from an
2828 environment where the limits are screwed down. Not all OS have the ability to
2829 change some of these limits. */
2833 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2839 #ifdef RLIMIT_NOFILE
2840 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2842 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2844 rlp.rlim_cur = rlp.rlim_max = 0;
2847 /* I originally chose 1000 as a nice big number that was unlikely to
2848 be exceeded. It turns out that some older OS have a fixed upper limit of
2851 if (rlp.rlim_cur < 1000)
2853 rlp.rlim_cur = rlp.rlim_max = 1000;
2854 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2856 rlp.rlim_cur = rlp.rlim_max = 256;
2857 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2858 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2865 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2867 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2869 rlp.rlim_cur = rlp.rlim_max = 0;
2872 #ifdef RLIM_INFINITY
2873 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2875 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2877 if (rlp.rlim_cur < 1000)
2879 rlp.rlim_cur = rlp.rlim_max = 1000;
2881 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2882 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2888 /* Exim is normally entered as root (but some special configurations are
2889 possible that don't do this). However, it always spins off sub-processes that
2890 set their uid and gid as required for local delivery. We don't want to pass on
2891 any extra groups that root may belong to, so we want to get rid of them all at
2894 We need to obey setgroups() at this stage, before possibly giving up root
2895 privilege for a changed configuration file, but later on we might need to
2896 check on the additional groups for the admin user privilege - can't do that
2897 till after reading the config, which might specify the exim gid. Therefore,
2898 save the group list here first. */
2900 group_count = getgroups(NGROUPS_MAX, group_list);
2902 /* There is a fundamental difference in some BSD systems in the matter of
2903 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2904 known not to be different. On the "different" systems there is a single group
2905 list, and the first entry in it is the current group. On all other versions of
2906 Unix there is a supplementary group list, which is in *addition* to the current
2907 group. Consequently, to get rid of all extraneous groups on a "standard" system
2908 you pass over 0 groups to setgroups(), while on a "different" system you pass
2909 over a single group - the current group, which is always the first group in the
2910 list. Calling setgroups() with zero groups on a "different" system results in
2911 an error return. The following code should cope with both types of system.
2913 However, if this process isn't running as root, setgroups() can't be used
2914 since you have to be root to run it, even if throwing away groups. Not being
2915 root here happens only in some unusual configurations. We just ignore the
2918 if (setgroups(0, NULL) != 0)
2920 if (setgroups(1, group_list) != 0 && !unprivileged)
2922 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2927 /* If the configuration file name has been altered by an argument on the
2928 command line (either a new file name or a macro definition) and the caller is
2929 not root or the exim user, or if this is a filter testing run, remove any
2930 setuid privilege the program has, and run as the underlying user.
2932 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2933 severely restricts the use of -C for some purposes.
2935 Otherwise, set the real ids to the effective values (should be root unless run
2936 from inetd, which it can either be root or the exim uid, if one is configured).
2938 There is a private mechanism for bypassing some of this, in order to make it
2939 possible to test lots of configurations automatically, without having either to
2940 recompile each time, or to patch in an actual configuration file name and other
2941 values (such as the path name). If running in the test harness, pretend that
2942 configuration file changes and macro definitions haven't happened. */
2945 (config_changed || macros != NULL) && /* Config changed, and */
2946 real_uid != root_uid && /* Not root, and */
2947 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2948 real_uid != exim_uid && /* Not exim, and */
2950 !running_in_test_harness /* Not fudged */
2952 expansion_test /* expansion testing */
2954 filter_test != NULL) /* Filter testing */
2956 setgroups(group_count, group_list);
2957 exim_setugid(real_uid, real_gid, FALSE,
2958 US"-C, -D, -be or -bf forces real uid");
2959 removed_privilege = TRUE;
2961 /* In the normal case when Exim is called like this, stderr is available
2962 and should be used for any logging information because attempts to write
2963 to the log will usually fail. To arrange this, we unset really_exim. However,
2964 if no stderr is available there is no point - we might as well have a go
2965 at the log (if it fails, syslog will be written). */
2967 if (log_stderr != NULL) really_exim = FALSE;
2970 /* Privilege is to be retained for the moment. It may be dropped later,
2971 depending on the job that this Exim process has been asked to do. For now, set
2972 the real uid to the effective so that subsequent re-execs of Exim are done by a
2975 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
2977 /* If testing a filter, open the file now, before wasting time doing other
2978 setups and reading the message. */
2980 if (filter_test != NULL)
2982 filter_fd = Uopen(filter_test, O_RDONLY,0);
2985 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test,
2987 return EXIT_FAILURE;
2991 /* Read the main runtime configuration data; this gives up if there
2992 is a failure. It leaves the configuration file open so that the subsequent
2993 configuration data for delivery can be read if needed. */
2997 /* Handle the decoding of logging options. */
2999 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3000 log_options, log_options_count, US"log");
3004 debug_printf("configuration file is %s\n", config_main_filename);
3005 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3006 log_extra_selector);
3009 /* If domain literals are not allowed, check the sender address that was
3010 supplied with -f. Ditto for a stripped trailing dot. */
3012 if (sender_address != NULL)
3014 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3016 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3017 "allowed\n", sender_address);
3018 return EXIT_FAILURE;
3020 if (f_end_dot && !strip_trailing_dot)
3022 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3023 "(trailing dot not allowed)\n", sender_address);
3024 return EXIT_FAILURE;
3028 /* Paranoia check of maximum lengths of certain strings. There is a check
3029 on the length of the log file path in log.c, which will come into effect
3030 if there are any calls to write the log earlier than this. However, if we
3031 get this far but the string is very long, it is better to stop now than to
3032 carry on and (e.g.) receive a message and then have to collapse. The call to
3033 log_write() from here will cause the ultimate panic collapse if the complete
3034 file name exceeds the buffer length. */
3036 if (Ustrlen(log_file_path) > 200)
3037 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3038 "log_file_path is longer than 200 chars: aborting");
3040 if (Ustrlen(pid_file_path) > 200)
3041 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3042 "pid_file_path is longer than 200 chars: aborting");
3044 if (Ustrlen(spool_directory) > 200)
3045 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3046 "spool_directory is longer than 200 chars: aborting");
3048 /* Length check on the process name given to syslog for its TAG field,
3049 which is only permitted to be 32 characters or less. See RFC 3164. */
3051 if (Ustrlen(syslog_processname) > 32)
3052 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3053 "syslog_processname is longer than 32 chars: aborting");
3055 /* In some operating systems, the environment variable TMPDIR controls where
3056 temporary files are created; Exim doesn't use these (apart from when delivering
3057 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3058 If TMPDIR is found in the environment, reset it to the value defined in the
3059 TMPDIR macro, if this macro is defined. */
3064 for (p = USS environ; *p != NULL; p++)
3066 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3067 Ustrcmp(*p+7, TMPDIR) != 0)
3069 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3070 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3072 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3078 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3079 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3080 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3081 called by a user who has set the TZ variable. This then affects the timestamps
3082 in log files and in Received: headers, and any created Date: header lines. The
3083 required timezone is settable in the configuration file, so nothing can be done
3084 about this earlier - but hopefully nothing will normally be logged earlier than
3085 this. We have to make a new environment if TZ is wrong, but don't bother if
3086 timestamps_utc is set, because then all times are in UTC anyway. */
3088 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3090 timestamps_utc = TRUE;
3094 uschar *envtz = US getenv("TZ");
3095 if ((envtz == NULL && timezone_string != NULL) ||
3097 (timezone_string == NULL ||
3098 Ustrcmp(timezone_string, envtz) != 0)))
3100 uschar **p = USS environ;
3104 while (*p++ != NULL) count++;
3105 if (envtz == NULL) count++;
3106 newp = new = malloc(sizeof(uschar *) * (count + 1));
3107 for (p = USS environ; *p != NULL; p++)
3109 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3112 if (timezone_string != NULL)
3114 *newp = malloc(Ustrlen(timezone_string) + 4);
3115 sprintf(CS *newp++, "TZ=%s", timezone_string);
3120 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3121 tod_stamp(tod_log));
3125 /* Handle the case when we have removed the setuid privilege because of -C or
3126 -D. This means that the caller of Exim was not root, and, provided that
3127 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3130 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3131 were running as the exim user defined in the configuration file (different to
3132 the one in the binary). The sysadmin may expect this case to retain privilege
3133 because "the binary was called by the Exim user", but it hasn't, because of the
3134 order in which it handles this stuff. There are two possibilities:
3136 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3137 to do message deliveries. Thus, the fact that it is running as a
3138 non-privileged user is plausible, and might be wanted in some special
3139 configurations. However, really_exim will have been set false when
3140 privilege was dropped, to stop Exim trying to write to its normal log
3141 files. Therefore, re-enable normal log processing, assuming the sysadmin
3142 has set up the log directory correctly.
3144 (2) If deliver_drop_privilege is not set, the configuration won't work as
3145 apparently intended, and so we log a panic message. In order to retain
3146 root for -C or -D, the caller must either be root or the Exim user
3147 defined in the binary (when deliver_drop_ privilege is false).
3149 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3150 built-in exim user or one defined in the configuration. In either event,
3151 re-enable log processing, assuming the sysadmin knows what they are doing. */
3153 if (removed_privilege && (config_changed || macros != NULL) &&
3154 real_uid == exim_uid)
3156 #ifdef ALT_CONFIG_ROOT_ONLY
3157 really_exim = TRUE; /* let logging work normally */
3160 if (deliver_drop_privilege)
3161 really_exim = TRUE; /* let logging work normally */
3163 log_write(0, LOG_MAIN|LOG_PANIC,
3164 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3165 (int)exim_uid, config_changed? "-C" : "-D");
3169 /* Start up Perl interpreter if Perl support is configured and there is a
3170 perl_startup option, and the configuration or the command line specifies
3171 initializing starting. Note that the global variables are actually called
3172 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3175 if (perl_start_option != 0)
3176 opt_perl_at_start = (perl_start_option > 0);
3177 if (opt_perl_at_start && opt_perl_startup != NULL)
3180 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3181 errstr = init_perl(opt_perl_startup);
3184 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3185 return EXIT_FAILURE;
3187 opt_perl_started = TRUE;
3189 #endif /* EXIM_PERL */
3191 /* Log the arguments of the call if the configuration file said so. This is
3192 a debugging feature for finding out what arguments certain MUAs actually use.
3193 Don't attempt it if logging is disabled, or if listing variables or if
3194 verifying/testing addresses or expansions. */
3196 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3197 && !list_options && !checking)
3200 uschar *p = big_buffer;
3202 (void)getcwd(CS p+4, big_buffer_size - 4);
3204 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3206 for (i = 0; i < argc; i++)
3208 int len = Ustrlen(argv[i]);
3211 if (p + len + 8 >= big_buffer + big_buffer_size)
3214 log_write(0, LOG_MAIN, "%s", big_buffer);
3215 Ustrcpy(big_buffer, "...");
3218 printing = string_printing(argv[i]);
3219 if (printing[0] == 0) quote = US"\""; else
3221 uschar *pp = printing;
3223 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3225 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3226 (p - big_buffer) - 4), printing, quote);
3229 log_write(0, LOG_MAIN, "%s", big_buffer);
3232 /* Set the working directory to be the top-level spool directory. We don't rely
3233 on this in the code, which always uses fully qualified names, but it's useful
3234 for core dumps etc. Don't complain if it fails - the spool directory might not
3235 be generally accessible and calls with the -C option (and others) have lost
3236 privilege by now. */
3238 if (Uchdir(spool_directory) != 0)
3240 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3241 (void)Uchdir(spool_directory);
3244 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3245 alias file. Exim doesn't have such a concept, but this call is screwed into
3246 Sun's YP makefiles. Handle this by calling a configured script, as the real
3247 user who called Exim. The -oA option can be used to pass an argument to the
3252 fclose(config_file);
3253 if (bi_command != NULL)
3257 argv[i++] = bi_command;
3258 if (alias_arg != NULL) argv[i++] = alias_arg;
3261 setgroups(group_count, group_list);
3262 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3264 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3265 (argv[1] == NULL)? US"" : argv[1]);
3267 execv(CS argv[0], (char *const *)argv);
3268 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3273 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3278 /* If an action on specific messages is requested, or if a daemon or queue
3279 runner is being started, we need to know if Exim was called by an admin user.
3280 This is the case if the real user is root or exim, or if the real group is
3281 exim, or if one of the supplementary groups is exim or a group listed in
3282 admin_groups. We don't fail all message actions immediately if not admin_user,
3283 since some actions can be performed by non-admin users. Instead, set admin_user
3284 for later interrogation. */
3286 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3292 for (i = 0; i < group_count; i++)
3294 if (group_list[i] == exim_gid) admin_user = TRUE;
3295 else if (admin_groups != NULL)
3297 for (j = 1; j <= (int)(admin_groups[0]); j++)
3298 if (admin_groups[j] == group_list[i])
3299 { admin_user = TRUE; break; }
3301 if (admin_user) break;
3305 /* Another group of privileged users are the trusted users. These are root,
3306 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3307 are permitted to specify sender_addresses with -f on the command line, and
3308 other message parameters as well. */
3310 if (real_uid == root_uid || real_uid == exim_uid)
3311 trusted_caller = TRUE;
3316 if (trusted_users != NULL)
3318 for (i = 1; i <= (int)(trusted_users[0]); i++)
3319 if (trusted_users[i] == real_uid)
3320 { trusted_caller = TRUE; break; }
3323 if (!trusted_caller && trusted_groups != NULL)
3325 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3327 if (trusted_groups[i] == real_gid)
3328 trusted_caller = TRUE;
3329 else for (j = 0; j < group_count; j++)
3331 if (trusted_groups[i] == group_list[j])
3332 { trusted_caller = TRUE; break; }
3334 if (trusted_caller) break;
3339 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3340 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3342 /* Only an admin user may start the daemon or force a queue run in the default
3343 configuration, but the queue run restriction can be relaxed. Only an admin
3344 user may request that a message be returned to its sender forthwith. Only an
3345 admin user may specify a debug level greater than D_v (because it might show
3346 passwords, etc. in lookup queries). Only an admin user may request a queue
3351 BOOL debugset = (debug_selector & ~D_v) != 0;
3352 if (deliver_give_up || daemon_listen ||
3353 (count_queue && queue_list_requires_admin) ||
3354 (list_queue && queue_list_requires_admin) ||
3355 (queue_interval >= 0 && prod_requires_admin) ||
3356 (debugset && !running_in_test_harness))
3358 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3363 /* If the real user is not root or the exim uid, the argument for passing
3364 in an open TCP/IP connection for another message is not permitted, nor is
3365 running with the -N option for any delivery action, unless this call to exim is
3366 one that supplied an input message, or we are using a patched exim for
3367 regression testing. */
3369 if (real_uid != root_uid && real_uid != exim_uid &&
3370 (continue_hostname != NULL ||
3372 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3373 )) && !running_in_test_harness)
3375 fprintf(stderr, "exim: Permission denied\n");
3376 return EXIT_FAILURE;
3379 /* If the caller is not trusted, certain arguments are ignored when running for
3380 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf). Note
3381 that authority for performing certain actions on messages is tested in the
3382 queue_action() function. */
3384 if (!trusted_caller && !checking && filter_test == NULL)
3386 sender_host_name = sender_host_address = interface_address =
3387 sender_ident = received_protocol = NULL;
3388 sender_host_port = interface_port = 0;
3389 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3392 /* If a sender host address is set, extract the optional port number off the
3393 end of it and check its syntax. Do the same thing for the interface address.
3394 Exim exits if the syntax is bad. */
3398 if (sender_host_address != NULL)
3399 sender_host_port = check_port(sender_host_address);
3400 if (interface_address != NULL)
3401 interface_port = check_port(interface_address);
3404 /* If an SMTP message is being received check to see if the standard input is a
3405 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3406 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3411 union sockaddr_46 inetd_sock;
3412 SOCKLEN_T size = sizeof(inetd_sock);
3413 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3415 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3416 if (family == AF_INET || family == AF_INET6)
3418 union sockaddr_46 interface_sock;
3419 size = sizeof(interface_sock);
3421 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3422 interface_address = host_ntoa(-1, &interface_sock, NULL,
3425 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3427 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3430 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3431 NULL, &sender_host_port);
3432 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3433 "inetd is not supported when mua_wrapper is set");
3438 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3439 return EXIT_FAILURE;
3445 /* If the load average is going to be needed while receiving a message, get it
3446 now for those OS that require the first call to os_getloadavg() to be done as
3447 root. There will be further calls later for each message received. */
3449 #ifdef LOAD_AVG_NEEDS_ROOT
3450 if (receiving_message &&
3451 (queue_only_load >= 0 ||
3452 (is_inetd && smtp_load_reserve >= 0)
3455 load_average = os_getloadavg();
3459 /* The queue_only configuration option can be overridden by -odx on the command
3460 line, except that if queue_only_override is false, queue_only cannot be unset
3461 from the command line. */
3463 if (queue_only_set && (queue_only_override || arg_queue_only))
3464 queue_only = arg_queue_only;
3466 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3469 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3470 if (arg_smtp_receive_timeout >= 0)
3471 smtp_receive_timeout = arg_smtp_receive_timeout;
3473 /* If Exim was started with root privilege, unless we have already removed the
3474 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3475 except when starting the daemon or doing some kind of delivery or address
3476 testing (-bt). These are the only cases when root need to be retained. We run
3477 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3478 retained only for starting the daemon. */
3480 if (!unprivileged && /* originally had root AND */
3481 !removed_privilege && /* still got root AND */
3482 !daemon_listen && /* not starting the daemon */
3483 queue_interval <= 0 && /* (either kind of daemon) */
3485 deliver_drop_privilege || /* requested unprivileged */
3487 queue_interval < 0 && /* not running the queue */
3488 (msg_action_arg < 0 || /* and */
3489 msg_action != MSG_DELIVER) && /* not delivering and */
3490 (!checking || !address_test_mode) /* not address checking */
3494 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3497 /* When we are retaining a privileged uid, we still change to the exim gid. */
3499 else setgid(exim_gid);
3501 /* Handle a request to list the delivery queue */
3505 set_process_info("listing the queue");
3506 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3510 /* Handle a request to count the delivery queue */
3514 set_process_info("counting the queue");
3519 /* Handle actions on specific messages, except for the force delivery action,
3520 which is done below. Some actions take a whole list of message ids, which
3521 are known to continue up to the end of the arguments. Others take a single
3522 message id and then operate on the recipients list. */
3524 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3526 int yield = EXIT_SUCCESS;
3527 set_process_info("acting on specified messages");
3529 if (!one_msg_action)
3531 for (i = msg_action_arg; i < argc; i++)
3532 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3533 yield = EXIT_FAILURE;
3536 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3537 recipients_arg)) yield = EXIT_FAILURE;
3541 /* All the modes below here require the remaining configuration sections
3542 to be read, except that we can skip over the ACL setting when delivering
3543 specific messages, or doing a queue run. (For various testing cases we could
3544 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3547 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3549 /* The configuration data will have been read into POOL_PERM because we won't
3550 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3551 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3552 configuration were read into POOL_MAIN, because we don't do any resets till
3553 later on. However, it seems right, and it does ensure that both pools get used.
3556 store_pool = POOL_MAIN;
3558 /* Handle the -brt option. This is for checking out retry configurations.
3559 The next three arguments are a domain name or a complete address, and
3560 optionally two error numbers. All it does is to call the function that
3561 scans the retry configuration data. */
3563 if (test_retry_arg >= 0)
3565 retry_config *yield;
3566 int basic_errno = 0;
3570 if (test_retry_arg >= argc)
3572 printf("-brt needs a domain or address argument\n");
3573 exim_exit(EXIT_FAILURE);
3575 s1 = argv[test_retry_arg++];
3578 /* If the first argument contains no @ and no . it might be a local user
3579 or it might be a single-component name. Treat as a domain. */
3581 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3583 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3584 "being \ntreated as a one-component domain, not as a local part.\n\n",
3588 /* There may be an optional second domain arg. */
3590 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3591 s2 = argv[test_retry_arg++];
3593 /* The final arg is an error name */
3595 if (test_retry_arg < argc)
3597 uschar *ss = argv[test_retry_arg];
3599 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3602 printf("%s\n", CS error);
3603 return EXIT_FAILURE;
3606 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3607 an error is for matching codes to the decade. Turn them into a real error
3608 code, off the decade. */
3610 if (basic_errno == ERRNO_RCPT4XX)
3612 int code = (more_errno >> 8) & 255;
3614 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3615 else if (code > 100)
3616 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3620 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3621 if (yield == NULL) printf("No retry information found\n"); else
3624 more_errno = yield->more_errno;
3625 printf("Retry rule: %s ", yield->pattern);
3627 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3629 printf("quota%s%s ",
3630 (more_errno > 0)? "_" : "",
3631 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3633 else if (yield->basic_errno == ECONNREFUSED)
3635 printf("refused%s%s ",
3636 (more_errno > 0)? "_" : "",
3637 (more_errno == 'M')? "MX" :
3638 (more_errno == 'A')? "A" : "");
3640 else if (yield->basic_errno == ETIMEDOUT)
3643 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3645 if (more_errno != 0) printf("_%s",
3646 (more_errno == 'M')? "MX" : "A");
3649 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3650 printf("auth_failed ");
3653 for (r = yield->rules; r != NULL; r = r->next)
3655 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3656 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3662 printf(",%d.", x/1000);
3676 exim_exit(EXIT_SUCCESS);
3679 /* Handle a request to list one or more configuration options */
3683 set_process_info("listing variables");
3684 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3685 else for (i = recipients_arg; i < argc; i++)
3688 (Ustrcmp(argv[i], "router") == 0 ||
3689 Ustrcmp(argv[i], "transport") == 0 ||
3690 Ustrcmp(argv[i], "authenticator") == 0))
3692 readconf_print(argv[i+1], argv[i]);
3695 else readconf_print(argv[i], NULL);
3697 exim_exit(EXIT_SUCCESS);
3701 /* Handle a request to deliver one or more messages that are already on the
3702 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3703 is typically used for a small number when prodding by hand (when the option
3704 forced_delivery will be set) or when re-execing to regain root privilege.
3705 Each message delivery must happen in a separate process, so we fork a process
3706 for each one, and run them sequentially so that debugging output doesn't get
3707 intertwined, and to avoid spawning too many processes if a long list is given.
3708 However, don't fork for the last one; this saves a process in the common case
3709 when Exim is called to deliver just one message. */
3711 if (msg_action_arg > 0)
3713 if (prod_requires_admin && !admin_user)
3715 fprintf(stderr, "exim: Permission denied\n");
3716 exim_exit(EXIT_FAILURE);
3718 set_process_info("delivering specified messages");
3719 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3720 for (i = msg_action_arg; i < argc; i++)
3725 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3726 else if ((pid = fork()) == 0)
3728 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3729 _exit(EXIT_SUCCESS);
3733 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3735 exim_exit(EXIT_FAILURE);
3739 exim_exit(EXIT_SUCCESS);
3743 /* If only a single queue run is requested, without SMTP listening, we can just
3744 turn into a queue runner, with an optional starting message id. */
3746 if (queue_interval == 0 && !daemon_listen)
3748 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3749 (start_queue_run_id == NULL)? US"" : US" starting at ",
3750 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3751 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3752 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3753 set_process_info("running the queue (single queue run)");
3754 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3755 exim_exit(EXIT_SUCCESS);
3759 /* Find the login name of the real user running this process. This is always
3760 needed when receiving a message, because it is written into the spool file. It
3761 may also be used to construct a from: or a sender: header, and in this case we
3762 need the user's full name as well, so save a copy of it, checked for RFC822
3763 syntax and munged if necessary, if it hasn't previously been set by the -F
3764 argument. We may try to get the passwd entry more than once, in case NIS or
3765 other delays are in evidence. Save the home directory for use in filter testing
3770 if ((pw = getpwuid(real_uid)) != NULL)
3772 originator_login = string_copy(US pw->pw_name);
3773 originator_home = string_copy(US pw->pw_dir);
3775 /* If user name has not been set by -F, set it from the passwd entry
3776 unless -f has been used to set the sender address by a trusted user. */
3778 if (originator_name == NULL)
3780 if (sender_address == NULL ||
3781 (!trusted_caller && filter_test == NULL))
3783 uschar *name = US pw->pw_gecos;
3784 uschar *amp = Ustrchr(name, '&');
3787 /* Most Unix specify that a '&' character in the gecos field is
3788 replaced by a copy of the login name, and some even specify that
3789 the first character should be upper cased, so that's what we do. */
3794 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3795 amp - name, name, &loffset, originator_login, amp + 1);
3796 buffer[loffset] = toupper(buffer[loffset]);
3800 /* If a pattern for matching the gecos field was supplied, apply
3801 it and then expand the name string. */
3803 if (gecos_pattern != NULL && gecos_name != NULL)
3806 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3808 if (regex_match_and_setup(re, name, 0, -1))
3810 uschar *new_name = expand_string(gecos_name);
3812 if (new_name != NULL)
3814 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3815 "gecos field \"%s\"\n", new_name, name);
3818 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3819 "\"%s\": %s\n", gecos_name, expand_string_message);
3821 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3822 "gecos field \"%s\"\n", gecos_pattern, name);
3823 store_free((void *)re);
3825 originator_name = string_copy(name);
3828 /* A trusted caller has used -f but not -F */
3830 else originator_name = US"";
3833 /* Break the retry loop */
3838 if (++i > finduser_retries) break;
3842 /* If we cannot get a user login, log the incident and give up, unless the
3843 configuration specifies something to use. When running in the test harness,
3844 any setting of unknown_login overrides the actual login name. */
3846 if (originator_login == NULL || running_in_test_harness)
3848 if (unknown_login != NULL)
3850 originator_login = expand_string(unknown_login);
3851 if (originator_name == NULL && unknown_username != NULL)
3852 originator_name = expand_string(unknown_username);
3853 if (originator_name == NULL) originator_name = US"";
3855 if (originator_login == NULL)
3856 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3860 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3863 originator_name = string_copy(parse_fix_phrase(originator_name,
3864 Ustrlen(originator_name), big_buffer, big_buffer_size));
3866 /* If a message is created by this call of Exim, the uid/gid of its originator
3867 are those of the caller. These values are overridden if an existing message is
3868 read in from the spool. */
3870 originator_uid = real_uid;
3871 originator_gid = real_gid;
3873 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3874 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3876 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3877 returns. We leave this till here so that the originator_ fields are available
3878 for incoming messages via the daemon. */
3880 if (daemon_listen || queue_interval > 0)
3882 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3883 "run when mua_wrapper is set");
3887 /* If the sender ident has not been set (by a trusted caller) set it to
3888 the caller. This will get overwritten below for an inetd call. If a trusted
3889 caller has set it empty, unset it. */
3891 if (sender_ident == NULL) sender_ident = originator_login;
3892 else if (sender_ident[0] == 0) sender_ident = NULL;
3894 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3895 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3896 originator_* variables set. */
3898 if (test_rewrite_arg >= 0)
3900 really_exim = FALSE;
3901 if (test_rewrite_arg >= argc)
3903 printf("-brw needs an address argument\n");
3904 exim_exit(EXIT_FAILURE);
3906 rewrite_test(argv[test_rewrite_arg]);
3907 exim_exit(EXIT_SUCCESS);
3910 /* A locally-supplied message is considered to be coming from a local user
3911 unless a trusted caller supplies a sender address with -f, or is passing in the
3912 message via SMTP (inetd invocation or otherwise). */
3914 if ((sender_address == NULL && !smtp_input) ||
3915 (!trusted_caller && filter_test == NULL))
3917 sender_local = TRUE;
3919 /* A trusted caller can supply authenticated_sender and authenticated_id
3920 via -oMas and -oMai and if so, they will already be set. */
3922 if (authenticated_sender == NULL)
3923 authenticated_sender = string_sprintf("%s@%s", originator_login,
3924 qualify_domain_sender);
3925 if (authenticated_id == NULL) authenticated_id = originator_login;
3928 /* Trusted callers are always permitted to specify the sender address.
3929 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3930 is specified is the empty address. However, if a trusted caller does not
3931 specify a sender address for SMTP input, we leave sender_address unset. This
3932 causes the MAIL commands to be honoured. */
3934 if ((!smtp_input && sender_address == NULL) ||
3935 !receive_check_set_sender(sender_address))
3937 /* Either the caller is not permitted to set a general sender, or this is
3938 non-SMTP input and the trusted caller has not set a sender. If there is no
3939 sender, or if a sender other than <> is set, override with the originator's
3940 login (which will get qualified below), except when checking things. */
3942 if (sender_address == NULL /* No sender_address set */
3944 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3945 !checking && /* Not running tests, AND */
3946 filter_test == NULL)) /* Not testing a filter */
3948 sender_address = originator_login;
3949 sender_address_forced = FALSE;
3950 sender_address_domain = 0;
3954 /* Remember whether an untrusted caller set the sender address */
3956 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3958 /* Ensure that the sender address is fully qualified unless it is the empty
3959 address, which indicates an error message, or doesn't exist (root caller, smtp
3960 interface, no -f argument). */
3962 if (sender_address != NULL && sender_address[0] != 0 &&
3963 sender_address_domain == 0)
3964 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
3965 qualify_domain_sender);
3967 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
3969 /* Handle a request to verify a list of addresses, or test them for delivery.
3970 This must follow the setting of the sender address, since routers can be
3971 predicated upon the sender. If no arguments are given, read addresses from
3972 stdin. Set debug_level to at least D_v to get full output for address testing.
3975 if (verify_address_mode || address_test_mode)
3978 int flags = vopt_qualify;
3980 if (verify_address_mode)
3982 if (!verify_as_sender) flags |= vopt_is_recipient;
3983 DEBUG(D_verify) debug_print_ids(US"Verifying:");
3988 flags |= vopt_is_recipient;
3989 debug_selector |= D_v;
3990 debug_file = stderr;
3991 debug_fd = fileno(debug_file);
3992 DEBUG(D_verify) debug_print_ids(US"Address testing:");
3995 if (recipients_arg < argc)
3997 while (recipients_arg < argc)
3999 uschar *s = argv[recipients_arg++];
4002 BOOL finished = FALSE;
4003 uschar *ss = parse_find_address_end(s, FALSE);
4004 if (*ss == ',') *ss = 0; else finished = TRUE;
4005 test_address(s, flags, &exit_value);
4008 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4015 uschar *s = get_stdinput(NULL, NULL);
4016 if (s == NULL) break;
4017 test_address(s, flags, &exit_value);
4021 exim_exit(exit_value);
4024 /* Handle expansion checking */
4028 if (recipients_arg < argc)
4030 while (recipients_arg < argc)
4032 uschar *s = argv[recipients_arg++];
4033 uschar *ss = expand_string(s);
4035 printf ("Failed: %s\n", expand_string_message);
4036 else printf("%s\n", CS ss);
4044 char *(*fn_readline)(char *) = NULL;
4045 char *(*fn_addhist)(char *) = NULL;
4048 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4054 uschar *source = get_stdinput(fn_readline, fn_addhist);
4055 if (source == NULL) break;
4056 ss = expand_string(source);
4058 printf ("Failed: %s\n", expand_string_message);
4059 else printf("%s\n", CS ss);
4063 if (dlhandle != NULL) dlclose(dlhandle);
4067 exim_exit(EXIT_SUCCESS);
4071 /* The active host name is normally the primary host name, but it can be varied
4072 for hosts that want to play several parts at once. We need to ensure that it is
4073 set for host checking, and for receiving messages. */
4075 smtp_active_hostname = primary_hostname;
4076 if (raw_active_hostname != NULL)
4078 uschar *nah = expand_string(raw_active_hostname);
4081 if (!expand_string_forcedfail)
4082 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4083 "(smtp_active_hostname): %s", raw_active_hostname,
4084 expand_string_message);
4086 else if (nah[0] != 0) smtp_active_hostname = nah;
4089 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4090 given IP address so that the blocking and relay configuration can be tested. An
4091 RFC 1413 call is made only if we are running in the test harness and an
4092 incoming interface and both ports are specified, because there is no TCP/IP
4093 call to find the ident for. */
4097 sender_ident = NULL;
4098 if (running_in_test_harness && sender_host_port != 0 &&
4099 interface_address != NULL && interface_port != 0)
4100 verify_get_ident(1413);
4102 host_build_sender_fullhost();
4106 sender_local = FALSE;
4107 sender_host_notsocket = TRUE;
4108 debug_file = stderr;
4109 debug_fd = fileno(debug_file);
4110 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4111 "**** but without any ident (RFC 1413) callback.\n"
4112 "**** This is not for real!\n\n",
4113 sender_host_address);
4115 if (verify_check_host(&hosts_connection_nolog) == OK)
4116 log_write_selector &= ~L_smtp_connection;
4117 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4119 if (smtp_start_session())
4121 reset_point = store_get(0);
4124 store_reset(reset_point);
4125 if (smtp_setup_msg() <= 0) break;
4126 if (!receive_msg(FALSE)) break;
4129 exim_exit(EXIT_SUCCESS);
4133 /* Arrange for message reception if recipients or SMTP were specified;
4134 otherwise complain unless a version print (-bV) happened or this is a filter
4135 verification test. In the former case, show the configuration file name. */
4137 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4139 if (version_printed)
4141 printf("Configuration file is %s\n", config_main_filename);
4142 return EXIT_SUCCESS;
4144 if (filter_test == NULL)
4147 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4148 "not directly from a shell command line. Options and/or arguments control\n"
4149 "what it does when called. For a list of options, see the Exim documentation.\n");
4150 return EXIT_FAILURE;
4155 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4156 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4157 that we are not called from inetd, because that is rejected above. The
4158 following configuration settings are forced here:
4160 (1) Synchronous delivery (-odi)
4161 (2) Errors to stderr (-oep == -oeq)
4162 (3) No parallel remote delivery
4163 (4) Unprivileged delivery
4165 We don't force overall queueing options because there are several of them;
4166 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4167 to override any SMTP queueing. */
4171 synchronous_delivery = TRUE;
4172 arg_error_handling = ERRORS_STDERR;
4173 remote_max_parallel = 1;
4174 deliver_drop_privilege = TRUE;
4176 queue_smtp_domains = NULL;
4180 /* Prepare to accept one or more new messages on the standard input. When a
4181 message has been read, its id is returned in message_id[]. If doing immediate
4182 delivery, we fork a delivery process for each received message, except for the
4183 last one, where we can save a process switch.
4185 It is only in non-smtp mode that error_handling is allowed to be changed from
4186 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4187 sendmail error modes other than -oem ever actually used? Later: yes.) */
4189 if (!smtp_input) error_handling = arg_error_handling;
4191 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4192 logging being sent down the socket and make an identd call to get the
4198 exim_nullstd(); /* Re-open to /dev/null */
4199 verify_get_ident(IDENT_PORT);
4200 host_build_sender_fullhost();
4201 set_process_info("handling incoming connection from %s via inetd",
4205 /* If the sender host address has been set, build sender_fullhost if it hasn't
4206 already been done (which it will have been for inetd). This caters for the
4207 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4208 so that the test for IP options is skipped for -bs input. */
4210 if (sender_host_address != NULL && sender_fullhost == NULL)
4212 host_build_sender_fullhost();
4213 set_process_info("handling incoming connection from %s via -oMa",
4215 sender_host_notsocket = TRUE;
4218 /* Otherwise, set the sender host as unknown except for inetd calls. This
4219 prevents host checking in the case of -bs not from inetd and also for -bS. */
4221 else if (!is_inetd) sender_host_unknown = TRUE;
4223 /* If stdout does not exist, then dup stdin to stdout. This can happen
4224 if exim is started from inetd. In this case fd 0 will be set to the socket,
4225 but fd 1 will not be set. This also happens for passed SMTP channels. */
4227 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4229 /* Set up the incoming protocol name and the state of the program. Root
4230 is allowed to force received protocol via the -oMr option above, and if we are
4231 in a non-local SMTP state it means we have come via inetd and the process info
4232 has already been set up. We don't set received_protocol here for smtp input,
4233 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4237 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4242 if (received_protocol == NULL)
4243 received_protocol = string_sprintf("local%s", called_as);
4244 set_process_info("accepting a local non-SMTP message from <%s>",
4248 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4252 local_queue_only = queue_only;
4254 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4255 the spool if so configured. On failure, we must not attempt to send an error
4256 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4257 error code is given.) */
4259 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4261 fprintf(stderr, "exim: insufficient disk space\n");
4262 return EXIT_FAILURE;
4265 /* If this is smtp input of any kind, handle the start of the SMTP
4272 if (verify_check_host(&hosts_connection_nolog) == OK)
4273 log_write_selector &= ~L_smtp_connection;
4274 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4275 if (!smtp_start_session())
4278 exim_exit(EXIT_SUCCESS);
4282 /* Otherwise, set up the input size limit here */
4286 thismessage_size_limit = expand_string_integer(message_size_limit);
4287 if (thismessage_size_limit < 0)
4289 if (thismessage_size_limit == -1)
4290 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4291 "message_size_limit: %s", expand_string_message);
4293 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4294 "message_size_limit: %s", expand_string_message);
4298 /* Loop for several messages when reading SMTP input. If we fork any child
4299 processes, we don't want to wait for them unless synchronous delivery is
4300 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4301 same as SIG_DFL, despite the fact that documentation often lists the default as
4302 "ignore". This is a confusing area. This is what I know:
4304 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4305 processes that complete simply to go away without ever becoming defunct. You
4306 can't then wait for them - but we don't want to wait for them in the
4307 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4308 happen for all OS (e.g. *BSD is different).
4310 But that's not the end of the story. Some (many? all?) systems have the
4311 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4312 has by default, so it seems that the difference is merely one of default
4313 (compare restarting vs non-restarting signals).
4315 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4316 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4317 of the loop below. Paranoia rules.
4319 February 2003: That's *still* not the end of the story. There are now versions
4320 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4321 process then calls waitpid(), a grumble is written to the system log, because
4322 this is logically inconsistent. In other words, it doesn't like the paranoia.
4323 As a consequenc of this, the waitpid() below is now excluded if we are sure
4324 that SIG_IGN works. */
4326 if (!synchronous_delivery)
4329 struct sigaction act;
4330 act.sa_handler = SIG_IGN;
4331 sigemptyset(&(act.sa_mask));
4332 act.sa_flags = SA_NOCLDWAIT;
4333 sigaction(SIGCHLD, &act, NULL);
4335 signal(SIGCHLD, SIG_IGN);
4339 /* Save the current store pool point, for resetting at the start of
4340 each message, and save the real sender address, if any. */
4342 reset_point = store_get(0);
4343 real_sender_address = sender_address;
4345 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4346 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4351 store_reset(reset_point);
4354 /* In the SMTP case, we have to handle the initial SMTP input and build the
4355 recipients list, before calling receive_msg() to read the message proper.
4356 Whatever sender address is actually given in the SMTP transaction is
4357 actually ignored for local senders - we use the actual sender, which is
4358 normally either the underlying user running this process or a -f argument
4359 provided by a trusted caller. It is saved in real_sender_address.
4361 However, if this value is NULL, we are dealing with a trusted caller when
4362 -f was not used; in this case, the SMTP sender is allowed to stand.
4364 Also, if untrusted_set_sender is set, we permit sender addresses that match
4365 anything in its list.
4367 The variable raw_sender_address holds the sender address before rewriting. */
4372 if ((rc = smtp_setup_msg()) > 0)
4374 if (real_sender_address != NULL &&
4375 !receive_check_set_sender(sender_address))
4377 sender_address = raw_sender = real_sender_address;
4378 sender_address_unrewritten = NULL;
4380 more = receive_msg(extract_recipients);
4381 if (message_id[0] == 0)
4384 exim_exit(EXIT_FAILURE);
4387 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4390 /* In the non-SMTP case, we have all the information from the command
4391 line, but must process it in case it is in the more general RFC822
4392 format, and in any case, to detect syntax errors. Also, it appears that
4393 the use of comma-separated lists as single arguments is common, so we
4394 had better support them. */
4400 int count = argc - recipients_arg;
4401 uschar **list = argv + recipients_arg;
4403 /* These options cannot be changed dynamically for non-SMTP messages */
4405 active_local_sender_retain = local_sender_retain;
4406 active_local_from_check = local_from_check;
4408 /* Save before any rewriting */
4410 raw_sender = string_copy(sender_address);
4412 /* Loop for each argument */
4414 for (i = 0; i < count; i++)
4416 int start, end, domain;
4418 uschar *s = list[i];
4420 /* Loop for each comma-separated address */
4424 BOOL finished = FALSE;
4426 uschar *ss = parse_find_address_end(s, FALSE);
4428 if (*ss == ',') *ss = 0; else finished = TRUE;
4430 /* Check max recipients - if -t was used, these aren't recipients */
4432 if (recipients_max > 0 && ++rcount > recipients_max &&
4433 !extract_recipients)
4435 if (error_handling == ERRORS_STDERR)
4437 fprintf(stderr, "exim: too many recipients\n");
4438 exim_exit(EXIT_FAILURE);
4443 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4444 errors_sender_rc : EXIT_FAILURE;
4449 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4451 if (domain == 0 && !allow_unqualified_recipient)
4454 errmess = US"unqualified recipient address not allowed";
4457 if (recipient == NULL)
4459 if (error_handling == ERRORS_STDERR)
4461 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4462 string_printing(list[i]), errmess);
4463 exim_exit(EXIT_FAILURE);
4469 eblock.text1 = string_printing(list[i]);
4470 eblock.text2 = errmess;
4472 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4473 errors_sender_rc : EXIT_FAILURE;
4477 receive_add_recipient(recipient, -1);
4480 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4484 /* Show the recipients when debugging */
4489 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4490 if (recipients_list != NULL)
4492 debug_printf("Recipients:\n");
4493 for (i = 0; i < recipients_count; i++)
4494 debug_printf(" %s\n", recipients_list[i].address);
4498 /* Read the data for the message. If filter_test is true, this will
4499 just read the headers for the message, and not write anything onto
4502 message_ended = END_NOTENDED;
4503 more = receive_msg(extract_recipients);
4505 /* more is always FALSE here (not SMTP message) when reading a message
4506 for real; when reading the headers of a message for filter testing,
4507 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4509 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4510 } /* Non-SMTP message reception */
4512 /* If this is a filter testing run, there are headers in store, but
4513 no message on the spool. Run the filtering code in testing mode, setting
4514 the domain to the qualify domain and the local part to the current user,
4515 unless they have been set by options. The prefix and suffix are left unset
4516 unless specified. The the return path is set to to the sender unless it has
4517 already been set from a return-path header in the message. */
4519 if (filter_test != NULL)
4521 deliver_domain = (ftest_domain != NULL)?
4522 ftest_domain : qualify_domain_recipient;
4523 deliver_domain_orig = deliver_domain;
4524 deliver_localpart = (ftest_localpart != NULL)?
4525 ftest_localpart : originator_login;
4526 deliver_localpart_orig = deliver_localpart;
4527 deliver_localpart_prefix = ftest_prefix;
4528 deliver_localpart_suffix = ftest_suffix;
4529 deliver_home = originator_home;
4531 if (return_path == NULL)
4533 printf("Return-path copied from sender\n");
4534 return_path = string_copy(sender_address);
4538 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4540 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4542 receive_add_recipient(
4543 string_sprintf("%s%s%s@%s",
4544 (ftest_prefix == NULL)? US"" : ftest_prefix,
4546 (ftest_suffix == NULL)? US"" : ftest_suffix,
4547 deliver_domain), -1);
4549 printf("Recipient = %s\n", recipients_list[0].address);
4550 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4551 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4553 chdir("/"); /* Get away from wherever the user is running this from */
4554 exim_exit(filter_runtest(filter_fd, ftest_system, more)?
4555 EXIT_SUCCESS : EXIT_FAILURE);
4558 /* Else act on the result of message reception. We should not get here unless
4559 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4560 TRUE. If it is not, check on the number of messages received in this
4561 connection. If that's OK and queue_only_load is set, check that the load
4562 average is below it. If it is not, set local_queue_only TRUE. Note that it
4563 then remains this way for any subsequent messages on the same SMTP connection.
4564 This is a deliberate choice; even though the load average may fall, it
4565 doesn't seem right to deliver later messages on the same call when not
4566 delivering earlier ones. */
4568 if (!local_queue_only)
4570 if (smtp_accept_queue_per_connection > 0 &&
4571 receive_messagecount > smtp_accept_queue_per_connection)
4573 local_queue_only = TRUE;
4574 queue_only_reason = 2;
4576 else if (queue_only_load >= 0)
4578 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4579 if (local_queue_only) queue_only_reason = 3;
4583 /* If running as an MUA wrapper, all queueing options and freezing options
4587 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4589 /* Log the queueing here, when it will get a message id attached, but
4590 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4593 if (local_queue_only) switch(queue_only_reason)
4596 log_write(L_delay_delivery,
4597 LOG_MAIN, "no immediate delivery: more than %d messages "
4598 "received in one connection", smtp_accept_queue_per_connection);
4602 log_write(L_delay_delivery,
4603 LOG_MAIN, "no immediate delivery: load average %.2f",
4604 (double)load_average/1000.0);
4608 /* Else do the delivery unless the ACL or local_scan() called for queue only
4609 or froze the message. Always deliver in a separate process. A fork failure is
4610 not a disaster, as the delivery will eventually happen on a subsequent queue
4611 run. The search cache must be tidied before the fork, as the parent will
4612 do it before exiting. The child will trigger a lookup failure and
4613 thereby defer the delivery if it tries to use (for example) a cached ldap
4614 connection that the parent has called unbind on. */
4616 else if (!queue_only_policy && !deliver_freeze)
4621 if ((pid = fork()) == 0)
4624 close_unwanted(); /* Close unwanted file descriptors and TLS */
4625 exim_nullstd(); /* Ensure std{in,out,err} exist */
4627 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4628 mode, deliver_drop_privilege is forced TRUE). */
4630 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4632 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4634 /* Control does not return here. */
4637 /* No need to re-exec */
4639 rc = deliver_message(message_id, FALSE, FALSE);
4641 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4642 EXIT_SUCCESS : EXIT_FAILURE);
4647 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4648 "process: %s", strerror(errno));
4651 /* In the parent, wait if synchronous delivery is required. This will
4652 always be the case in MUA wrapper mode. */
4654 else if (synchronous_delivery)
4657 while (wait(&status) != pid);
4658 if ((status & 0x00ff) != 0)
4659 log_write(0, LOG_MAIN|LOG_PANIC,
4660 "process %d crashed with signal %d while delivering %s",
4661 (int)pid, status & 0x00ff, message_id);
4662 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4666 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4667 automatically reaps children (see comments above the loop), clear away any
4668 finished subprocesses here, in case there are lots of messages coming in
4669 from the same source. */
4671 #ifndef SIG_IGN_WORKS
4672 while (waitpid(-1, NULL, WNOHANG) > 0);
4676 exim_exit(EXIT_SUCCESS); /* Never returns */
4677 return 0; /* To stop compiler warning */