1 /* $Cambridge: exim/src/src/exim.c,v 1.10 2004/11/25 13:54:31 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;
1172 int filter_sfd = -1;
1173 int filter_ufd = -1;
1176 int list_queue_option = 0;
1178 int msg_action_arg = -1;
1179 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1180 int queue_only_reason = 0;
1182 int perl_start_option = 0;
1184 int recipients_arg = argc;
1185 int sender_address_domain = 0;
1186 int test_retry_arg = -1;
1187 int test_rewrite_arg = -1;
1188 BOOL arg_queue_only = FALSE;
1189 BOOL bi_option = FALSE;
1190 BOOL checking = FALSE;
1191 BOOL count_queue = FALSE;
1192 BOOL expansion_test = FALSE;
1193 BOOL extract_recipients = FALSE;
1194 BOOL forced_delivery = FALSE;
1195 BOOL f_end_dot = FALSE;
1196 BOOL deliver_give_up = FALSE;
1197 BOOL list_queue = FALSE;
1198 BOOL list_options = FALSE;
1199 BOOL local_queue_only;
1201 BOOL one_msg_action = FALSE;
1202 BOOL queue_only_set = FALSE;
1203 BOOL receiving_message = TRUE;
1205 BOOL removed_privilege = FALSE;
1206 BOOL verify_address_mode = FALSE;
1207 BOOL verify_as_sender = FALSE;
1208 BOOL version_printed = FALSE;
1209 uschar *alias_arg = NULL;
1210 uschar *called_as = US"";
1211 uschar *start_queue_run_id = NULL;
1212 uschar *stop_queue_run_id = NULL;
1213 uschar *ftest_domain = NULL;
1214 uschar *ftest_localpart = NULL;
1215 uschar *ftest_prefix = NULL;
1216 uschar *ftest_suffix = NULL;
1217 uschar *real_sender_address;
1218 uschar *originator_home = US"/";
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 system filter test */
1586 else if (*argrest == 'F')
1588 filter_test |= FTEST_SYSTEM;
1589 if (*(++argrest) != 0) { badarg = TRUE; break; }
1590 if (++i < argc) filter_test_sfile = argv[i]; else
1592 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1597 /* -bf: Run user filter test
1598 -bfd: Set domain for filter testing
1599 -bfl: Set local part for filter testing
1600 -bfp: Set prefix for filter testing
1601 -bfs: Set suffix for filter testing
1604 else if (*argrest == 'f')
1606 if (*(++argrest) == 0)
1608 filter_test |= FTEST_USER;
1609 if (++i < argc) filter_test_ufile = argv[i]; else
1611 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1619 fprintf(stderr, "exim: string expected after %s\n", arg);
1622 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1623 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1624 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1625 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1626 else { badarg = TRUE; break; }
1630 /* -bh: Host checking - an IP address must follow. */
1632 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1634 if (++i >= argc) { badarg = TRUE; break; }
1635 sender_host_address = argv[i];
1636 host_checking = checking = log_testing_mode = TRUE;
1637 host_checking_callout = argrest[1] == 'c';
1640 /* -bi: This option is used by sendmail to initialize *the* alias file,
1641 though it has the -oA option to specify a different file. Exim has no
1642 concept of *the* alias file, but since Sun's YP make script calls
1643 sendmail this way, some support must be provided. */
1645 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1647 /* -bm: Accept and deliver message - the default option. Reinstate
1648 receiving_message, which got turned off for all -b options. */
1650 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1652 /* -bnq: For locally originating messages, do not qualify unqualified
1653 addresses. In the envelope, this causes errors; in header lines they
1656 else if (Ustrcmp(argrest, "nq") == 0)
1658 allow_unqualified_sender = FALSE;
1659 allow_unqualified_recipient = FALSE;
1662 /* -bpxx: List the contents of the mail queue, in various forms. If
1663 the option is -bpc, just a queue count is needed. Otherwise, if the
1664 first letter after p is r, then order is random. */
1666 else if (*argrest == 'p')
1668 if (*(++argrest) == 'c')
1671 if (*(++argrest) != 0) badarg = TRUE;
1675 if (*argrest == 'r')
1677 list_queue_option = 8;
1680 else list_queue_option = 0;
1684 /* -bp: List the contents of the mail queue, top-level only */
1686 if (*argrest == 0) {}
1688 /* -bpu: List the contents of the mail queue, top-level undelivered */
1690 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1692 /* -bpa: List the contents of the mail queue, including all delivered */
1694 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1696 /* Unknown after -bp[r] */
1706 /* -bP: List the configuration variables given as the address list.
1707 Force -v, so configuration errors get displayed. */
1709 else if (Ustrcmp(argrest, "P") == 0)
1711 list_options = TRUE;
1712 debug_selector |= D_v;
1713 debug_file = stderr;
1716 /* -brt: Test retry configuration lookup */
1718 else if (Ustrcmp(argrest, "rt") == 0)
1720 test_retry_arg = i + 1;
1724 /* -brw: Test rewrite configuration */
1726 else if (Ustrcmp(argrest, "rw") == 0)
1728 test_rewrite_arg = i + 1;
1732 /* -bS: Read SMTP commands on standard input, but produce no replies -
1733 all errors are reported by sending messages. */
1735 else if (Ustrcmp(argrest, "S") == 0)
1736 smtp_input = smtp_batched_input = receiving_message = TRUE;
1738 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1739 on standard output. */
1741 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1743 /* -bt: address testing mode */
1745 else if (Ustrcmp(argrest, "t") == 0)
1746 address_test_mode = checking = log_testing_mode = TRUE;
1748 /* -bv: verify addresses */
1750 else if (Ustrcmp(argrest, "v") == 0)
1751 verify_address_mode = checking = log_testing_mode = TRUE;
1753 /* -bvs: verify sender addresses */
1755 else if (Ustrcmp(argrest, "vs") == 0)
1757 verify_address_mode = checking = log_testing_mode = TRUE;
1758 verify_as_sender = TRUE;
1761 /* -bV: Print version string and support details */
1763 else if (Ustrcmp(argrest, "V") == 0)
1765 printf("Exim version %s #%s built %s\n", version_string,
1766 version_cnumber, version_date);
1767 printf("%s\n", CS version_copyright);
1768 version_printed = TRUE;
1769 show_whats_supported(stdout);
1776 /* -C: change configuration file list; ignore if it isn't really
1777 a change! Enforce a prefix check if required. */
1782 if(++i < argc) argrest = argv[i]; else
1783 { badarg = TRUE; break; }
1785 if (Ustrcmp(config_main_filelist, argrest) != 0)
1787 #ifdef ALT_CONFIG_PREFIX
1789 int len = Ustrlen(ALT_CONFIG_PREFIX);
1790 uschar *list = argrest;
1792 while((filename = string_nextinlist(&list, &sep, big_buffer,
1793 big_buffer_size)) != NULL)
1795 if ((Ustrlen(filename) < len ||
1796 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1797 Ustrstr(filename, "/../") != NULL) &&
1798 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1800 fprintf(stderr, "-C Permission denied\n");
1806 config_main_filelist = argrest;
1807 config_changed = TRUE;
1812 /* -D: set up a macro definition */
1815 #ifdef DISABLE_D_OPTION
1816 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1821 macro_item *mlast = NULL;
1824 uschar *s = argrest;
1826 while (isspace(*s)) s++;
1828 if (*s < 'A' || *s > 'Z')
1830 fprintf(stderr, "exim: macro name set by -D must start with "
1831 "an upper case letter\n");
1835 while (isalnum(*s) || *s == '_')
1837 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1841 if (ptr == 0) { badarg = TRUE; break; }
1842 while (isspace(*s)) s++;
1845 if (*s++ != '=') { badarg = TRUE; break; }
1846 while (isspace(*s)) s++;
1849 for (m = macros; m != NULL; m = m->next)
1851 if (Ustrcmp(m->name, name) == 0)
1853 fprintf(stderr, "exim: duplicated -D in command line\n");
1859 m = store_get(sizeof(macro_item) + Ustrlen(name));
1861 m->command_line = TRUE;
1862 if (mlast == NULL) macros = m; else mlast->next = m;
1863 Ustrcpy(m->name, name);
1864 m->replacement = string_copy(s);
1866 if (clmacro_count >= MAX_CLMACROS)
1868 fprintf(stderr, "exim: too many -D options on command line\n");
1871 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1877 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1878 The latter is now a no-op, retained for compatibility only. If -dd is used,
1879 debugging subprocesses of the daemon is disabled. */
1882 if (Ustrcmp(argrest, "ropcr") == 0)
1884 /* drop_cr = TRUE; */
1887 /* Use an intermediate variable so that we don't set debugging while
1888 decoding the debugging bits. */
1892 unsigned int selector = D_default;
1895 if (*argrest == 'd')
1897 debug_daemon = TRUE;
1901 decode_bits(&selector, NULL, argrest, debug_options,
1902 debug_options_count, US"debug");
1903 debug_selector = selector;
1908 /* -E: This is a local error message. This option is not intended for
1909 external use at all, but is not restricted to trusted callers because it
1910 does no harm (just suppresses certain error messages) and if Exim is run
1911 not setuid root it won't always be trusted when it generates error
1912 messages using this option. If there is a message id following -E, point
1913 message_reference at it, for logging. */
1916 local_error_message = TRUE;
1917 if (mac_ismsgid(argrest)) message_reference = argrest;
1921 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1922 option, so it looks as if historically the -oex options are also callable
1923 without the leading -o. So we have to accept them. Before the switch,
1924 anything starting -oe has been converted to -e. Exim does not support all
1925 of the sendmail error options. */
1928 if (Ustrcmp(argrest, "e") == 0)
1930 arg_error_handling = ERRORS_SENDER;
1931 errors_sender_rc = EXIT_SUCCESS;
1933 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1934 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1935 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1936 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1941 /* -F: Set sender's full name, used instead of the gecos entry from
1942 the password file. Since users can usually alter their gecos entries,
1943 there's no security involved in using this instead. The data can follow
1944 the -F or be in the next argument. */
1949 if(++i < argc) argrest = argv[i]; else
1950 { badarg = TRUE; break; }
1952 originator_name = argrest;
1956 /* -f: Set sender's address - this value is only actually used if Exim is
1957 run by a trusted user, or if untrusted_set_sender is set and matches the
1958 address, except that the null address can always be set by any user. The
1959 test for this happens later, when the value given here is ignored when not
1960 permitted. For an untrusted user, the actual sender is still put in Sender:
1961 if it doesn't match the From: header (unless no_local_from_check is set).
1962 The data can follow the -f or be in the next argument. The -r switch is an
1963 obsolete form of -f but since there appear to be programs out there that
1964 use anything that sendmail has ever supported, better accept it - the
1965 synonymizing is done before the switch above.
1967 At this stage, we must allow domain literal addresses, because we don't
1968 know what the setting of allow_domain_literals is yet. Ditto for trailing
1969 dots and strip_trailing_dot. */
1977 if (i+1 < argc) argrest = argv[++i]; else
1978 { badarg = TRUE; break; }
1982 sender_address = string_sprintf(""); /* Ensure writeable memory */
1986 uschar *temp = argrest + Ustrlen(argrest) - 1;
1987 while (temp >= argrest && isspace(*temp)) temp--;
1988 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
1989 allow_domain_literals = TRUE;
1990 strip_trailing_dot = TRUE;
1991 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
1992 &sender_address_domain, TRUE);
1993 allow_domain_literals = FALSE;
1994 strip_trailing_dot = FALSE;
1995 if (sender_address == NULL)
1997 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
1998 return EXIT_FAILURE;
2001 sender_address_forced = TRUE;
2005 /* This is some Sendmail thing which can be ignored */
2010 /* -h: Set the hop count for an incoming message. Exim does not currently
2011 support this; it always computes it by counting the Received: headers.
2012 To put it in will require a change to the spool header file format. */
2017 if(++i < argc) argrest = argv[i]; else
2018 { badarg = TRUE; break; }
2020 if (!isdigit(*argrest)) badarg = TRUE;
2024 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2025 not to be documented for sendmail but mailx (at least) uses it) */
2028 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2033 receiving_message = FALSE;
2035 /* -MC: continue delivery of another message via an existing open
2036 file descriptor. This option is used for an internal call by the
2037 smtp transport when there is a pending message waiting to go to an
2038 address to which it has got a connection. Five subsequent arguments are
2039 required: transport name, host name, IP address, sequence number, and
2040 message_id. Transports may decline to create new processes if the sequence
2041 number gets too big. The channel is stdin. This (-MC) must be the last
2042 argument. There's a subsequent check that the real-uid is privileged.
2044 If we are running in the test harness. delay for a bit, to let the process
2045 that set this one up complete. This makes for repeatability of the logging,
2048 if (Ustrcmp(argrest, "C") == 0)
2052 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2053 return EXIT_FAILURE;
2056 if (msg_action_arg >= 0)
2058 fprintf(stderr, "exim: incompatible arguments\n");
2059 return EXIT_FAILURE;
2062 continue_transport = argv[++i];
2063 continue_hostname = argv[++i];
2064 continue_host_address = argv[++i];
2065 continue_sequence = Uatoi(argv[++i]);
2066 msg_action = MSG_DELIVER;
2067 msg_action_arg = ++i;
2068 forced_delivery = TRUE;
2069 queue_run_pid = passed_qr_pid;
2070 queue_run_pipe = passed_qr_pipe;
2072 if (!mac_ismsgid(argv[i]))
2074 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2076 return EXIT_FAILURE;
2079 if (running_in_test_harness) millisleep(500);
2083 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2084 precedes -MC (see above). The flag indicates that the host to which
2085 Exim is connected has accepted an AUTH sequence. */
2087 else if (Ustrcmp(argrest, "CA") == 0)
2089 smtp_authenticated = TRUE;
2093 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2094 it preceded -MC (see above) */
2096 else if (Ustrcmp(argrest, "CP") == 0)
2098 smtp_use_pipelining = TRUE;
2102 /* -MCQ: pass on the pid of the queue-running process that started
2103 this chain of deliveries and the fd of its synchronizing pipe; this
2104 is useful only when it precedes -MC (see above) */
2106 else if (Ustrcmp(argrest, "CQ") == 0)
2108 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2110 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2115 /* -MCS: set the smtp_use_size flag; this is useful only when it
2116 precedes -MC (see above) */
2118 else if (Ustrcmp(argrest, "CS") == 0)
2120 smtp_use_size = TRUE;
2124 /* -MCT: set the tls_offered flag; this is useful only when it
2125 precedes -MC (see above). The flag indicates that the host to which
2126 Exim is connected has offered TLS support. */
2129 else if (Ustrcmp(argrest, "CT") == 0)
2136 /* -M[x]: various operations on the following list of message ids:
2137 -M deliver the messages, ignoring next retry times and thawing
2138 -Mc deliver the messages, checking next retry times, no thawing
2139 -Mf freeze the messages
2140 -Mg give up on the messages
2141 -Mt thaw the messages
2142 -Mrm remove the messages
2143 In the above cases, this must be the last option. There are also the
2144 following options which are followed by a single message id, and which
2145 act on that message. Some of them use the "recipient" addresses as well.
2146 -Mar add recipient(s)
2147 -Mmad mark all recipients delivered
2148 -Mmd mark recipients(s) delivered
2155 else if (*argrest == 0)
2157 msg_action = MSG_DELIVER;
2158 forced_delivery = deliver_force_thaw = TRUE;
2160 else if (Ustrcmp(argrest, "ar") == 0)
2162 msg_action = MSG_ADD_RECIPIENT;
2163 one_msg_action = TRUE;
2165 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2166 else if (Ustrcmp(argrest, "es") == 0)
2168 msg_action = MSG_EDIT_SENDER;
2169 one_msg_action = TRUE;
2171 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2172 else if (Ustrcmp(argrest, "g") == 0)
2174 msg_action = MSG_DELIVER;
2175 deliver_give_up = TRUE;
2177 else if (Ustrcmp(argrest, "mad") == 0)
2179 msg_action = MSG_MARK_ALL_DELIVERED;
2181 else if (Ustrcmp(argrest, "md") == 0)
2183 msg_action = MSG_MARK_DELIVERED;
2184 one_msg_action = TRUE;
2186 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2187 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2188 else if (Ustrcmp(argrest, "vb") == 0)
2190 msg_action = MSG_SHOW_BODY;
2191 one_msg_action = TRUE;
2193 else if (Ustrcmp(argrest, "vh") == 0)
2195 msg_action = MSG_SHOW_HEADER;
2196 one_msg_action = TRUE;
2198 else if (Ustrcmp(argrest, "vl") == 0)
2200 msg_action = MSG_SHOW_LOG;
2201 one_msg_action = TRUE;
2203 else { badarg = TRUE; break; }
2205 /* All the -Mxx options require at least one message id. */
2207 msg_action_arg = i + 1;
2208 if (msg_action_arg >= argc)
2210 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2211 return EXIT_FAILURE;
2214 /* Some require only message ids to follow */
2216 if (!one_msg_action)
2219 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2221 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2223 return EXIT_FAILURE;
2225 goto END_ARG; /* Remaining args are ids */
2228 /* Others require only one message id, possibly followed by addresses,
2229 which will be handled as normal arguments. */
2233 if (!mac_ismsgid(argv[msg_action_arg]))
2235 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2236 argv[msg_action_arg], arg);
2237 return EXIT_FAILURE;
2244 /* Some programs seem to call the -om option without the leading o;
2245 for sendmail it askes for "me too". Exim always does this. */
2248 if (*argrest != 0) badarg = TRUE;
2252 /* -N: don't do delivery - a debugging option that stops transports doing
2253 their thing. It implies debugging at the D_v level. */
2258 dont_deliver = TRUE;
2259 debug_selector |= D_v;
2260 debug_file = stderr;
2266 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2272 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2273 option to the specified value. This form uses long names. We need to handle
2274 -O option=value and -Ooption=value. */
2281 fprintf(stderr, "exim: string expected after -O\n");
2289 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2292 if (*argrest == 'A')
2294 alias_arg = argrest + 1;
2295 if (alias_arg[0] == 0)
2297 if (i+1 < argc) alias_arg = argv[++i]; else
2299 fprintf(stderr, "exim: string expected after -oA\n");
2305 /* -oB: Set a connection message max value for remote deliveries */
2307 else if (*argrest == 'B')
2309 uschar *p = argrest + 1;
2312 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2314 connection_max_messages = 1;
2323 fprintf(stderr, "exim: number expected after -oB\n");
2326 connection_max_messages = Uatoi(p);
2330 /* -odb: background delivery */
2332 else if (Ustrcmp(argrest, "db") == 0)
2334 synchronous_delivery = FALSE;
2335 arg_queue_only = FALSE;
2336 queue_only_set = TRUE;
2339 /* -odf: foreground delivery (smail-compatible option); same effect as
2340 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2343 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2345 synchronous_delivery = TRUE;
2346 arg_queue_only = FALSE;
2347 queue_only_set = TRUE;
2350 /* -odq: queue only */
2352 else if (Ustrcmp(argrest, "dq") == 0)
2354 synchronous_delivery = FALSE;
2355 arg_queue_only = TRUE;
2356 queue_only_set = TRUE;
2359 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2360 but no remote delivery */
2362 else if (Ustrcmp(argrest, "dqs") == 0)
2365 arg_queue_only = FALSE;
2366 queue_only_set = TRUE;
2369 /* -oex: Sendmail error flags. As these are also accepted without the
2370 leading -o prefix, for compatibility with vacation and other callers,
2371 they are handled with -e above. */
2373 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2374 -oitrue: Another sendmail syntax for the same */
2376 else if (Ustrcmp(argrest, "i") == 0 ||
2377 Ustrcmp(argrest, "itrue") == 0)
2380 /* -oM*: Set various characteristics for an incoming message; actually
2381 acted on for trusted callers only. */
2383 else if (*argrest == 'M')
2387 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2391 /* -oMa: Set sender host address */
2393 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2395 /* -oMaa: Set authenticator name */
2397 else if (Ustrcmp(argrest, "Maa") == 0)
2398 sender_host_authenticated = argv[++i];
2400 /* -oMas: setting authenticated sender */
2402 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2404 /* -oMai: setting authenticated id */
2406 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2408 /* -oMi: Set incoming interface address */
2410 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2412 /* -oMr: Received protocol */
2414 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2416 /* -oMs: Set sender host name */
2418 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2420 /* -oMt: Set sender ident */
2422 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2424 /* Else a bad argument */
2433 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2434 seem to call this as -m (undocumented), so that is also accepted (see
2437 else if (Ustrcmp(argrest, "m") == 0) {}
2439 /* -oo: An ancient flag for old-style addresses which still seems to
2440 crop up in some calls (see in SCO). */
2442 else if (Ustrcmp(argrest, "o") == 0) {}
2444 /* -oP <name>: set pid file path for daemon */
2446 else if (Ustrcmp(argrest, "P") == 0)
2447 override_pid_file_path = argv[++i];
2449 /* -or <n>: set timeout for non-SMTP acceptance
2450 -os <n>: set timeout for SMTP acceptance */
2452 else if (*argrest == 'r' || *argrest == 's')
2454 int *tp = (*argrest == 'r')?
2455 &arg_receive_timeout : &arg_smtp_receive_timeout;
2456 if (argrest[1] == 0)
2458 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2460 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2463 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2468 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2470 else if (Ustrcmp(argrest, "X") == 0)
2471 override_local_interfaces = argv[++i];
2473 /* Unknown -o argument */
2479 /* -ps: force Perl startup; -pd force delayed Perl startup */
2483 if (*argrest == 's' && argrest[1] == 0)
2485 perl_start_option = 1;
2488 if (*argrest == 'd' && argrest[1] == 0)
2490 perl_start_option = -1;
2495 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2496 which sets the host protocol and host name */
2500 if (i+1 < argc) argrest = argv[++i]; else
2501 { badarg = TRUE; break; }
2506 uschar *hn = Ustrchr(argrest, ':');
2509 received_protocol = argrest;
2513 received_protocol = string_copyn(argrest, hn - argrest);
2514 sender_host_name = hn + 1;
2521 receiving_message = FALSE;
2523 /* -qq...: Do queue runs in a 2-stage manner */
2525 if (*argrest == 'q')
2527 queue_2stage = TRUE;
2531 /* -qi...: Do only first (initial) deliveries */
2533 if (*argrest == 'i')
2535 queue_run_first_delivery = TRUE;
2539 /* -qf...: Run the queue, forcing deliveries
2540 -qff..: Ditto, forcing thawing as well */
2542 if (*argrest == 'f')
2544 queue_run_force = TRUE;
2545 if (*(++argrest) == 'f')
2547 deliver_force_thaw = TRUE;
2552 /* -q[f][f]l...: Run the queue only on local deliveries */
2554 if (*argrest == 'l')
2556 queue_run_local = TRUE;
2560 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2561 optionally starting from a given message id. */
2563 if (*argrest == 0 &&
2564 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2567 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2568 start_queue_run_id = argv[++i];
2569 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2570 stop_queue_run_id = argv[++i];
2573 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2574 optionally local only. */
2579 queue_interval = readconf_readtime(argrest, 0, FALSE);
2581 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2582 if (queue_interval <= 0)
2584 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2591 case 'R': /* Synonymous with -qR... */
2592 receiving_message = FALSE;
2594 /* -Rf: As -R (below) but force all deliveries,
2595 -Rff: Ditto, but also thaw all frozen messages,
2596 -Rr: String is regex
2597 -Rrf: Regex and force
2598 -Rrff: Regex and force and thaw
2600 in all cases provided there are no further characters in this
2606 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2608 if (Ustrcmp(argrest, rsopts[i]) == 0)
2610 if (i != 2) queue_run_force = TRUE;
2611 if (i >= 2) deliver_selectstring_regex = TRUE;
2612 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2613 argrest += Ustrlen(rsopts[i]);
2618 /* -R: Set string to match in addresses for forced queue run to
2619 pick out particular messages. */
2623 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2625 fprintf(stderr, "exim: string expected after -R\n");
2629 else deliver_selectstring = argrest;
2630 if (queue_interval < 0) queue_interval = 0;
2634 /* -r: an obsolete synonym for -f (see above) */
2637 /* -S: Like -R but works on sender. */
2639 case 'S': /* Synonymous with -qS... */
2640 receiving_message = FALSE;
2642 /* -Sf: As -S (below) but force all deliveries,
2643 -Sff: Ditto, but also thaw all frozen messages,
2644 -Sr: String is regex
2645 -Srf: Regex and force
2646 -Srff: Regex and force and thaw
2648 in all cases provided there are no further characters in this
2654 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2656 if (Ustrcmp(argrest, rsopts[i]) == 0)
2658 if (i != 2) queue_run_force = TRUE;
2659 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2660 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2661 argrest += Ustrlen(rsopts[i]);
2666 /* -S: Set string to match in addresses for forced queue run to
2667 pick out particular messages. */
2671 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2673 fprintf(stderr, "exim: string expected after -S\n");
2677 else deliver_selectstring_sender = argrest;
2678 if (queue_interval < 0) queue_interval = 0;
2681 /* -Tqt is an option that is exclusively for use by the testing suite.
2682 It is not recognized in other circumstances. It allows for the setting up
2683 of explicit "queue times" so that various warning/retry things can be
2684 tested. Otherwise variability of clock ticks etc. cause problems. */
2687 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2688 fudged_queue_times = argv[++i];
2693 /* -t: Set flag to extract recipients from body of message. */
2696 if (*argrest == 0) extract_recipients = TRUE;
2698 /* -ti: Set flag to extract recipients from body of message, and also
2699 specify that dot does not end the message. */
2701 else if (Ustrcmp(argrest, "i") == 0)
2703 extract_recipients = TRUE;
2707 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2710 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2717 /* -U: This means "initial user submission" in sendmail, apparently. The
2718 doc claims that in future sendmail may refuse syntactically invalid
2719 messages instead of fixing them. For the moment, we just ignore it. */
2725 /* -v: verify things - this is a very low-level debugging */
2730 debug_selector |= D_v;
2731 debug_file = stderr;
2737 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2739 The -x flag tells the sendmail command that mail from a local
2740 mail program has National Language Support (NLS) extended characters
2741 in the body of the mail item. The sendmail command can send mail with
2742 extended NLS characters across networks that normally corrupts these
2745 As Exim is 8-bit clean, it just ignores this flag. */
2748 if (*argrest != 0) badarg = TRUE;
2751 /* All other initial characters are errors */
2756 } /* End of high-level switch statement */
2758 /* Failed to recognize the option, or syntax error */
2762 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2763 "option %s\n", arg);
2769 /* Arguments have been processed. Check for incompatibilities. */
2773 (smtp_input || extract_recipients || recipients_arg < argc) &&
2774 (daemon_listen || queue_interval >= 0 || bi_option ||
2775 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2776 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2779 msg_action_arg > 0 &&
2780 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2781 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2784 (daemon_listen || queue_interval >= 0) &&
2785 (sender_address != NULL || list_options || list_queue || checking ||
2789 daemon_listen && queue_interval == 0
2793 (checking || smtp_input || extract_recipients ||
2794 filter_test != FTEST_NONE || bi_option)
2797 verify_address_mode &&
2798 (address_test_mode || smtp_input || extract_recipients ||
2799 filter_test != FTEST_NONE || bi_option)
2802 address_test_mode && (smtp_input || extract_recipients ||
2803 filter_test != FTEST_NONE || bi_option)
2806 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2810 deliver_selectstring != NULL && queue_interval < 0
2814 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2818 /* If debugging is set up, set the file and the file descriptor to pass on to
2819 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2820 to run in the foreground. */
2822 if (debug_selector != 0)
2824 debug_file = stderr;
2825 debug_fd = fileno(debug_file);
2826 background_daemon = FALSE;
2827 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2828 if (debug_selector != D_v) /* -v only doesn't show this */
2830 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2831 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2833 show_whats_supported(stderr);
2837 /* When started with root privilege, ensure that the limits on the number of
2838 open files and the number of processes (where that is accessible) are
2839 sufficiently large, or are unset, in case Exim has been called from an
2840 environment where the limits are screwed down. Not all OS have the ability to
2841 change some of these limits. */
2845 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2851 #ifdef RLIMIT_NOFILE
2852 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2854 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2856 rlp.rlim_cur = rlp.rlim_max = 0;
2859 /* I originally chose 1000 as a nice big number that was unlikely to
2860 be exceeded. It turns out that some older OS have a fixed upper limit of
2863 if (rlp.rlim_cur < 1000)
2865 rlp.rlim_cur = rlp.rlim_max = 1000;
2866 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2868 rlp.rlim_cur = rlp.rlim_max = 256;
2869 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2870 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2877 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2879 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2881 rlp.rlim_cur = rlp.rlim_max = 0;
2884 #ifdef RLIM_INFINITY
2885 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2887 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2889 if (rlp.rlim_cur < 1000)
2891 rlp.rlim_cur = rlp.rlim_max = 1000;
2893 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2894 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2900 /* Exim is normally entered as root (but some special configurations are
2901 possible that don't do this). However, it always spins off sub-processes that
2902 set their uid and gid as required for local delivery. We don't want to pass on
2903 any extra groups that root may belong to, so we want to get rid of them all at
2906 We need to obey setgroups() at this stage, before possibly giving up root
2907 privilege for a changed configuration file, but later on we might need to
2908 check on the additional groups for the admin user privilege - can't do that
2909 till after reading the config, which might specify the exim gid. Therefore,
2910 save the group list here first. */
2912 group_count = getgroups(NGROUPS_MAX, group_list);
2914 /* There is a fundamental difference in some BSD systems in the matter of
2915 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2916 known not to be different. On the "different" systems there is a single group
2917 list, and the first entry in it is the current group. On all other versions of
2918 Unix there is a supplementary group list, which is in *addition* to the current
2919 group. Consequently, to get rid of all extraneous groups on a "standard" system
2920 you pass over 0 groups to setgroups(), while on a "different" system you pass
2921 over a single group - the current group, which is always the first group in the
2922 list. Calling setgroups() with zero groups on a "different" system results in
2923 an error return. The following code should cope with both types of system.
2925 However, if this process isn't running as root, setgroups() can't be used
2926 since you have to be root to run it, even if throwing away groups. Not being
2927 root here happens only in some unusual configurations. We just ignore the
2930 if (setgroups(0, NULL) != 0)
2932 if (setgroups(1, group_list) != 0 && !unprivileged)
2934 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2939 /* If the configuration file name has been altered by an argument on the
2940 command line (either a new file name or a macro definition) and the caller is
2941 not root or the exim user, or if this is a filter testing run, remove any
2942 setuid privilege the program has, and run as the underlying user.
2944 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2945 severely restricts the use of -C for some purposes.
2947 Otherwise, set the real ids to the effective values (should be root unless run
2948 from inetd, which it can either be root or the exim uid, if one is configured).
2950 There is a private mechanism for bypassing some of this, in order to make it
2951 possible to test lots of configurations automatically, without having either to
2952 recompile each time, or to patch in an actual configuration file name and other
2953 values (such as the path name). If running in the test harness, pretend that
2954 configuration file changes and macro definitions haven't happened. */
2957 (config_changed || macros != NULL) && /* Config changed, and */
2958 real_uid != root_uid && /* Not root, and */
2959 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2960 real_uid != exim_uid && /* Not exim, and */
2962 !running_in_test_harness /* Not fudged */
2964 expansion_test /* expansion testing */
2966 filter_test != FTEST_NONE) /* Filter testing */
2968 setgroups(group_count, group_list);
2969 exim_setugid(real_uid, real_gid, FALSE,
2970 US"-C, -D, -be or -bf forces real uid");
2971 removed_privilege = TRUE;
2973 /* In the normal case when Exim is called like this, stderr is available
2974 and should be used for any logging information because attempts to write
2975 to the log will usually fail. To arrange this, we unset really_exim. However,
2976 if no stderr is available there is no point - we might as well have a go
2977 at the log (if it fails, syslog will be written). */
2979 if (log_stderr != NULL) really_exim = FALSE;
2982 /* Privilege is to be retained for the moment. It may be dropped later,
2983 depending on the job that this Exim process has been asked to do. For now, set
2984 the real uid to the effective so that subsequent re-execs of Exim are done by a
2987 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
2989 /* If testing a filter, open the file(s) now, before wasting time doing other
2990 setups and reading the message. */
2992 if ((filter_test & FTEST_SYSTEM) != 0)
2994 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
2997 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
2999 return EXIT_FAILURE;
3003 if ((filter_test & FTEST_USER) != 0)
3005 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3008 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3010 return EXIT_FAILURE;
3014 /* Read the main runtime configuration data; this gives up if there
3015 is a failure. It leaves the configuration file open so that the subsequent
3016 configuration data for delivery can be read if needed. */
3020 /* Handle the decoding of logging options. */
3022 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3023 log_options, log_options_count, US"log");
3027 debug_printf("configuration file is %s\n", config_main_filename);
3028 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3029 log_extra_selector);
3032 /* If domain literals are not allowed, check the sender address that was
3033 supplied with -f. Ditto for a stripped trailing dot. */
3035 if (sender_address != NULL)
3037 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3039 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3040 "allowed\n", sender_address);
3041 return EXIT_FAILURE;
3043 if (f_end_dot && !strip_trailing_dot)
3045 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3046 "(trailing dot not allowed)\n", sender_address);
3047 return EXIT_FAILURE;
3051 /* Paranoia check of maximum lengths of certain strings. There is a check
3052 on the length of the log file path in log.c, which will come into effect
3053 if there are any calls to write the log earlier than this. However, if we
3054 get this far but the string is very long, it is better to stop now than to
3055 carry on and (e.g.) receive a message and then have to collapse. The call to
3056 log_write() from here will cause the ultimate panic collapse if the complete
3057 file name exceeds the buffer length. */
3059 if (Ustrlen(log_file_path) > 200)
3060 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3061 "log_file_path is longer than 200 chars: aborting");
3063 if (Ustrlen(pid_file_path) > 200)
3064 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3065 "pid_file_path is longer than 200 chars: aborting");
3067 if (Ustrlen(spool_directory) > 200)
3068 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3069 "spool_directory is longer than 200 chars: aborting");
3071 /* Length check on the process name given to syslog for its TAG field,
3072 which is only permitted to be 32 characters or less. See RFC 3164. */
3074 if (Ustrlen(syslog_processname) > 32)
3075 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3076 "syslog_processname is longer than 32 chars: aborting");
3078 /* In some operating systems, the environment variable TMPDIR controls where
3079 temporary files are created; Exim doesn't use these (apart from when delivering
3080 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3081 If TMPDIR is found in the environment, reset it to the value defined in the
3082 TMPDIR macro, if this macro is defined. */
3087 for (p = USS environ; *p != NULL; p++)
3089 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3090 Ustrcmp(*p+7, TMPDIR) != 0)
3092 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3093 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3095 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3101 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3102 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3103 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3104 called by a user who has set the TZ variable. This then affects the timestamps
3105 in log files and in Received: headers, and any created Date: header lines. The
3106 required timezone is settable in the configuration file, so nothing can be done
3107 about this earlier - but hopefully nothing will normally be logged earlier than
3108 this. We have to make a new environment if TZ is wrong, but don't bother if
3109 timestamps_utc is set, because then all times are in UTC anyway. */
3111 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3113 timestamps_utc = TRUE;
3117 uschar *envtz = US getenv("TZ");
3118 if ((envtz == NULL && timezone_string != NULL) ||
3120 (timezone_string == NULL ||
3121 Ustrcmp(timezone_string, envtz) != 0)))
3123 uschar **p = USS environ;
3127 while (*p++ != NULL) count++;
3128 if (envtz == NULL) count++;
3129 newp = new = malloc(sizeof(uschar *) * (count + 1));
3130 for (p = USS environ; *p != NULL; p++)
3132 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3135 if (timezone_string != NULL)
3137 *newp = malloc(Ustrlen(timezone_string) + 4);
3138 sprintf(CS *newp++, "TZ=%s", timezone_string);
3143 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3144 tod_stamp(tod_log));
3148 /* Handle the case when we have removed the setuid privilege because of -C or
3149 -D. This means that the caller of Exim was not root, and, provided that
3150 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3153 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3154 were running as the exim user defined in the configuration file (different to
3155 the one in the binary). The sysadmin may expect this case to retain privilege
3156 because "the binary was called by the Exim user", but it hasn't, because of the
3157 order in which it handles this stuff. There are two possibilities:
3159 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3160 to do message deliveries. Thus, the fact that it is running as a
3161 non-privileged user is plausible, and might be wanted in some special
3162 configurations. However, really_exim will have been set false when
3163 privilege was dropped, to stop Exim trying to write to its normal log
3164 files. Therefore, re-enable normal log processing, assuming the sysadmin
3165 has set up the log directory correctly.
3167 (2) If deliver_drop_privilege is not set, the configuration won't work as
3168 apparently intended, and so we log a panic message. In order to retain
3169 root for -C or -D, the caller must either be root or the Exim user
3170 defined in the binary (when deliver_drop_ privilege is false).
3172 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3173 built-in exim user or one defined in the configuration. In either event,
3174 re-enable log processing, assuming the sysadmin knows what they are doing. */
3176 if (removed_privilege && (config_changed || macros != NULL) &&
3177 real_uid == exim_uid)
3179 #ifdef ALT_CONFIG_ROOT_ONLY
3180 really_exim = TRUE; /* let logging work normally */
3183 if (deliver_drop_privilege)
3184 really_exim = TRUE; /* let logging work normally */
3186 log_write(0, LOG_MAIN|LOG_PANIC,
3187 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3188 (int)exim_uid, config_changed? "-C" : "-D");
3192 /* Start up Perl interpreter if Perl support is configured and there is a
3193 perl_startup option, and the configuration or the command line specifies
3194 initializing starting. Note that the global variables are actually called
3195 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3198 if (perl_start_option != 0)
3199 opt_perl_at_start = (perl_start_option > 0);
3200 if (opt_perl_at_start && opt_perl_startup != NULL)
3203 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3204 errstr = init_perl(opt_perl_startup);
3207 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3208 return EXIT_FAILURE;
3210 opt_perl_started = TRUE;
3212 #endif /* EXIM_PERL */
3214 /* Log the arguments of the call if the configuration file said so. This is
3215 a debugging feature for finding out what arguments certain MUAs actually use.
3216 Don't attempt it if logging is disabled, or if listing variables or if
3217 verifying/testing addresses or expansions. */
3219 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3220 && !list_options && !checking)
3223 uschar *p = big_buffer;
3225 (void)getcwd(CS p+4, big_buffer_size - 4);
3227 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3229 for (i = 0; i < argc; i++)
3231 int len = Ustrlen(argv[i]);
3234 if (p + len + 8 >= big_buffer + big_buffer_size)
3237 log_write(0, LOG_MAIN, "%s", big_buffer);
3238 Ustrcpy(big_buffer, "...");
3241 printing = string_printing(argv[i]);
3242 if (printing[0] == 0) quote = US"\""; else
3244 uschar *pp = printing;
3246 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3248 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3249 (p - big_buffer) - 4), printing, quote);
3252 log_write(0, LOG_MAIN, "%s", big_buffer);
3255 /* Set the working directory to be the top-level spool directory. We don't rely
3256 on this in the code, which always uses fully qualified names, but it's useful
3257 for core dumps etc. Don't complain if it fails - the spool directory might not
3258 be generally accessible and calls with the -C option (and others) have lost
3259 privilege by now. */
3261 if (Uchdir(spool_directory) != 0)
3263 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3264 (void)Uchdir(spool_directory);
3267 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3268 alias file. Exim doesn't have such a concept, but this call is screwed into
3269 Sun's YP makefiles. Handle this by calling a configured script, as the real
3270 user who called Exim. The -oA option can be used to pass an argument to the
3275 fclose(config_file);
3276 if (bi_command != NULL)
3280 argv[i++] = bi_command;
3281 if (alias_arg != NULL) argv[i++] = alias_arg;
3284 setgroups(group_count, group_list);
3285 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3287 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3288 (argv[1] == NULL)? US"" : argv[1]);
3290 execv(CS argv[0], (char *const *)argv);
3291 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3296 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3301 /* If an action on specific messages is requested, or if a daemon or queue
3302 runner is being started, we need to know if Exim was called by an admin user.
3303 This is the case if the real user is root or exim, or if the real group is
3304 exim, or if one of the supplementary groups is exim or a group listed in
3305 admin_groups. We don't fail all message actions immediately if not admin_user,
3306 since some actions can be performed by non-admin users. Instead, set admin_user
3307 for later interrogation. */
3309 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3315 for (i = 0; i < group_count; i++)
3317 if (group_list[i] == exim_gid) admin_user = TRUE;
3318 else if (admin_groups != NULL)
3320 for (j = 1; j <= (int)(admin_groups[0]); j++)
3321 if (admin_groups[j] == group_list[i])
3322 { admin_user = TRUE; break; }
3324 if (admin_user) break;
3328 /* Another group of privileged users are the trusted users. These are root,
3329 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3330 are permitted to specify sender_addresses with -f on the command line, and
3331 other message parameters as well. */
3333 if (real_uid == root_uid || real_uid == exim_uid)
3334 trusted_caller = TRUE;
3339 if (trusted_users != NULL)
3341 for (i = 1; i <= (int)(trusted_users[0]); i++)
3342 if (trusted_users[i] == real_uid)
3343 { trusted_caller = TRUE; break; }
3346 if (!trusted_caller && trusted_groups != NULL)
3348 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3350 if (trusted_groups[i] == real_gid)
3351 trusted_caller = TRUE;
3352 else for (j = 0; j < group_count; j++)
3354 if (trusted_groups[i] == group_list[j])
3355 { trusted_caller = TRUE; break; }
3357 if (trusted_caller) break;
3362 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3363 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3365 /* Only an admin user may start the daemon or force a queue run in the default
3366 configuration, but the queue run restriction can be relaxed. Only an admin
3367 user may request that a message be returned to its sender forthwith. Only an
3368 admin user may specify a debug level greater than D_v (because it might show
3369 passwords, etc. in lookup queries). Only an admin user may request a queue
3374 BOOL debugset = (debug_selector & ~D_v) != 0;
3375 if (deliver_give_up || daemon_listen ||
3376 (count_queue && queue_list_requires_admin) ||
3377 (list_queue && queue_list_requires_admin) ||
3378 (queue_interval >= 0 && prod_requires_admin) ||
3379 (debugset && !running_in_test_harness))
3381 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3386 /* If the real user is not root or the exim uid, the argument for passing
3387 in an open TCP/IP connection for another message is not permitted, nor is
3388 running with the -N option for any delivery action, unless this call to exim is
3389 one that supplied an input message, or we are using a patched exim for
3390 regression testing. */
3392 if (real_uid != root_uid && real_uid != exim_uid &&
3393 (continue_hostname != NULL ||
3395 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3396 )) && !running_in_test_harness)
3398 fprintf(stderr, "exim: Permission denied\n");
3399 return EXIT_FAILURE;
3402 /* If the caller is not trusted, certain arguments are ignored when running for
3403 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3404 Note that authority for performing certain actions on messages is tested in the
3405 queue_action() function. */
3407 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3409 sender_host_name = sender_host_address = interface_address =
3410 sender_ident = received_protocol = NULL;
3411 sender_host_port = interface_port = 0;
3412 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3415 /* If a sender host address is set, extract the optional port number off the
3416 end of it and check its syntax. Do the same thing for the interface address.
3417 Exim exits if the syntax is bad. */
3421 if (sender_host_address != NULL)
3422 sender_host_port = check_port(sender_host_address);
3423 if (interface_address != NULL)
3424 interface_port = check_port(interface_address);
3427 /* If an SMTP message is being received check to see if the standard input is a
3428 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3429 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3434 union sockaddr_46 inetd_sock;
3435 SOCKLEN_T size = sizeof(inetd_sock);
3436 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3438 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3439 if (family == AF_INET || family == AF_INET6)
3441 union sockaddr_46 interface_sock;
3442 size = sizeof(interface_sock);
3444 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3445 interface_address = host_ntoa(-1, &interface_sock, NULL,
3448 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3450 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3453 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3454 NULL, &sender_host_port);
3455 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3456 "inetd is not supported when mua_wrapper is set");
3461 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3462 return EXIT_FAILURE;
3468 /* If the load average is going to be needed while receiving a message, get it
3469 now for those OS that require the first call to os_getloadavg() to be done as
3470 root. There will be further calls later for each message received. */
3472 #ifdef LOAD_AVG_NEEDS_ROOT
3473 if (receiving_message &&
3474 (queue_only_load >= 0 ||
3475 (is_inetd && smtp_load_reserve >= 0)
3478 load_average = os_getloadavg();
3482 /* The queue_only configuration option can be overridden by -odx on the command
3483 line, except that if queue_only_override is false, queue_only cannot be unset
3484 from the command line. */
3486 if (queue_only_set && (queue_only_override || arg_queue_only))
3487 queue_only = arg_queue_only;
3489 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3492 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3493 if (arg_smtp_receive_timeout >= 0)
3494 smtp_receive_timeout = arg_smtp_receive_timeout;
3496 /* If Exim was started with root privilege, unless we have already removed the
3497 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3498 except when starting the daemon or doing some kind of delivery or address
3499 testing (-bt). These are the only cases when root need to be retained. We run
3500 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3501 retained only for starting the daemon. */
3503 if (!unprivileged && /* originally had root AND */
3504 !removed_privilege && /* still got root AND */
3505 !daemon_listen && /* not starting the daemon */
3506 queue_interval <= 0 && /* (either kind of daemon) */
3508 deliver_drop_privilege || /* requested unprivileged */
3510 queue_interval < 0 && /* not running the queue */
3511 (msg_action_arg < 0 || /* and */
3512 msg_action != MSG_DELIVER) && /* not delivering and */
3513 (!checking || !address_test_mode) /* not address checking */
3517 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3520 /* When we are retaining a privileged uid, we still change to the exim gid. */
3522 else setgid(exim_gid);
3524 /* Handle a request to list the delivery queue */
3528 set_process_info("listing the queue");
3529 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3533 /* Handle a request to count the delivery queue */
3537 set_process_info("counting the queue");
3542 /* Handle actions on specific messages, except for the force delivery action,
3543 which is done below. Some actions take a whole list of message ids, which
3544 are known to continue up to the end of the arguments. Others take a single
3545 message id and then operate on the recipients list. */
3547 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3549 int yield = EXIT_SUCCESS;
3550 set_process_info("acting on specified messages");
3552 if (!one_msg_action)
3554 for (i = msg_action_arg; i < argc; i++)
3555 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3556 yield = EXIT_FAILURE;
3559 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3560 recipients_arg)) yield = EXIT_FAILURE;
3564 /* All the modes below here require the remaining configuration sections
3565 to be read, except that we can skip over the ACL setting when delivering
3566 specific messages, or doing a queue run. (For various testing cases we could
3567 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3570 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3572 /* The configuration data will have been read into POOL_PERM because we won't
3573 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3574 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3575 configuration were read into POOL_MAIN, because we don't do any resets till
3576 later on. However, it seems right, and it does ensure that both pools get used.
3579 store_pool = POOL_MAIN;
3581 /* Handle the -brt option. This is for checking out retry configurations.
3582 The next three arguments are a domain name or a complete address, and
3583 optionally two error numbers. All it does is to call the function that
3584 scans the retry configuration data. */
3586 if (test_retry_arg >= 0)
3588 retry_config *yield;
3589 int basic_errno = 0;
3593 if (test_retry_arg >= argc)
3595 printf("-brt needs a domain or address argument\n");
3596 exim_exit(EXIT_FAILURE);
3598 s1 = argv[test_retry_arg++];
3601 /* If the first argument contains no @ and no . it might be a local user
3602 or it might be a single-component name. Treat as a domain. */
3604 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3606 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3607 "being \ntreated as a one-component domain, not as a local part.\n\n",
3611 /* There may be an optional second domain arg. */
3613 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3614 s2 = argv[test_retry_arg++];
3616 /* The final arg is an error name */
3618 if (test_retry_arg < argc)
3620 uschar *ss = argv[test_retry_arg];
3622 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3625 printf("%s\n", CS error);
3626 return EXIT_FAILURE;
3629 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3630 an error is for matching codes to the decade. Turn them into a real error
3631 code, off the decade. */
3633 if (basic_errno == ERRNO_RCPT4XX)
3635 int code = (more_errno >> 8) & 255;
3637 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3638 else if (code > 100)
3639 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3643 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3644 if (yield == NULL) printf("No retry information found\n"); else
3647 more_errno = yield->more_errno;
3648 printf("Retry rule: %s ", yield->pattern);
3650 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3652 printf("quota%s%s ",
3653 (more_errno > 0)? "_" : "",
3654 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3656 else if (yield->basic_errno == ECONNREFUSED)
3658 printf("refused%s%s ",
3659 (more_errno > 0)? "_" : "",
3660 (more_errno == 'M')? "MX" :
3661 (more_errno == 'A')? "A" : "");
3663 else if (yield->basic_errno == ETIMEDOUT)
3666 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3668 if (more_errno != 0) printf("_%s",
3669 (more_errno == 'M')? "MX" : "A");
3672 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3673 printf("auth_failed ");
3676 for (r = yield->rules; r != NULL; r = r->next)
3678 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3679 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3685 printf(",%d.", x/1000);
3699 exim_exit(EXIT_SUCCESS);
3702 /* Handle a request to list one or more configuration options */
3706 set_process_info("listing variables");
3707 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3708 else for (i = recipients_arg; i < argc; i++)
3711 (Ustrcmp(argv[i], "router") == 0 ||
3712 Ustrcmp(argv[i], "transport") == 0 ||
3713 Ustrcmp(argv[i], "authenticator") == 0))
3715 readconf_print(argv[i+1], argv[i]);
3718 else readconf_print(argv[i], NULL);
3720 exim_exit(EXIT_SUCCESS);
3724 /* Handle a request to deliver one or more messages that are already on the
3725 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3726 is typically used for a small number when prodding by hand (when the option
3727 forced_delivery will be set) or when re-execing to regain root privilege.
3728 Each message delivery must happen in a separate process, so we fork a process
3729 for each one, and run them sequentially so that debugging output doesn't get
3730 intertwined, and to avoid spawning too many processes if a long list is given.
3731 However, don't fork for the last one; this saves a process in the common case
3732 when Exim is called to deliver just one message. */
3734 if (msg_action_arg > 0)
3736 if (prod_requires_admin && !admin_user)
3738 fprintf(stderr, "exim: Permission denied\n");
3739 exim_exit(EXIT_FAILURE);
3741 set_process_info("delivering specified messages");
3742 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3743 for (i = msg_action_arg; i < argc; i++)
3748 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3749 else if ((pid = fork()) == 0)
3751 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3752 _exit(EXIT_SUCCESS);
3756 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3758 exim_exit(EXIT_FAILURE);
3762 exim_exit(EXIT_SUCCESS);
3766 /* If only a single queue run is requested, without SMTP listening, we can just
3767 turn into a queue runner, with an optional starting message id. */
3769 if (queue_interval == 0 && !daemon_listen)
3771 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3772 (start_queue_run_id == NULL)? US"" : US" starting at ",
3773 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3774 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3775 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3776 set_process_info("running the queue (single queue run)");
3777 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3778 exim_exit(EXIT_SUCCESS);
3782 /* Find the login name of the real user running this process. This is always
3783 needed when receiving a message, because it is written into the spool file. It
3784 may also be used to construct a from: or a sender: header, and in this case we
3785 need the user's full name as well, so save a copy of it, checked for RFC822
3786 syntax and munged if necessary, if it hasn't previously been set by the -F
3787 argument. We may try to get the passwd entry more than once, in case NIS or
3788 other delays are in evidence. Save the home directory for use in filter testing
3793 if ((pw = getpwuid(real_uid)) != NULL)
3795 originator_login = string_copy(US pw->pw_name);
3796 originator_home = string_copy(US pw->pw_dir);
3798 /* If user name has not been set by -F, set it from the passwd entry
3799 unless -f has been used to set the sender address by a trusted user. */
3801 if (originator_name == NULL)
3803 if (sender_address == NULL ||
3804 (!trusted_caller && filter_test == FTEST_NONE))
3806 uschar *name = US pw->pw_gecos;
3807 uschar *amp = Ustrchr(name, '&');
3810 /* Most Unix specify that a '&' character in the gecos field is
3811 replaced by a copy of the login name, and some even specify that
3812 the first character should be upper cased, so that's what we do. */
3817 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3818 amp - name, name, &loffset, originator_login, amp + 1);
3819 buffer[loffset] = toupper(buffer[loffset]);
3823 /* If a pattern for matching the gecos field was supplied, apply
3824 it and then expand the name string. */
3826 if (gecos_pattern != NULL && gecos_name != NULL)
3829 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3831 if (regex_match_and_setup(re, name, 0, -1))
3833 uschar *new_name = expand_string(gecos_name);
3835 if (new_name != NULL)
3837 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3838 "gecos field \"%s\"\n", new_name, name);
3841 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3842 "\"%s\": %s\n", gecos_name, expand_string_message);
3844 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3845 "gecos field \"%s\"\n", gecos_pattern, name);
3846 store_free((void *)re);
3848 originator_name = string_copy(name);
3851 /* A trusted caller has used -f but not -F */
3853 else originator_name = US"";
3856 /* Break the retry loop */
3861 if (++i > finduser_retries) break;
3865 /* If we cannot get a user login, log the incident and give up, unless the
3866 configuration specifies something to use. When running in the test harness,
3867 any setting of unknown_login overrides the actual login name. */
3869 if (originator_login == NULL || running_in_test_harness)
3871 if (unknown_login != NULL)
3873 originator_login = expand_string(unknown_login);
3874 if (originator_name == NULL && unknown_username != NULL)
3875 originator_name = expand_string(unknown_username);
3876 if (originator_name == NULL) originator_name = US"";
3878 if (originator_login == NULL)
3879 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3883 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3886 originator_name = string_copy(parse_fix_phrase(originator_name,
3887 Ustrlen(originator_name), big_buffer, big_buffer_size));
3889 /* If a message is created by this call of Exim, the uid/gid of its originator
3890 are those of the caller. These values are overridden if an existing message is
3891 read in from the spool. */
3893 originator_uid = real_uid;
3894 originator_gid = real_gid;
3896 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3897 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3899 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3900 returns. We leave this till here so that the originator_ fields are available
3901 for incoming messages via the daemon. */
3903 if (daemon_listen || queue_interval > 0)
3905 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3906 "run when mua_wrapper is set");
3910 /* If the sender ident has not been set (by a trusted caller) set it to
3911 the caller. This will get overwritten below for an inetd call. If a trusted
3912 caller has set it empty, unset it. */
3914 if (sender_ident == NULL) sender_ident = originator_login;
3915 else if (sender_ident[0] == 0) sender_ident = NULL;
3917 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3918 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3919 originator_* variables set. */
3921 if (test_rewrite_arg >= 0)
3923 really_exim = FALSE;
3924 if (test_rewrite_arg >= argc)
3926 printf("-brw needs an address argument\n");
3927 exim_exit(EXIT_FAILURE);
3929 rewrite_test(argv[test_rewrite_arg]);
3930 exim_exit(EXIT_SUCCESS);
3933 /* A locally-supplied message is considered to be coming from a local user
3934 unless a trusted caller supplies a sender address with -f, or is passing in the
3935 message via SMTP (inetd invocation or otherwise). */
3937 if ((sender_address == NULL && !smtp_input) ||
3938 (!trusted_caller && filter_test == FTEST_NONE))
3940 sender_local = TRUE;
3942 /* A trusted caller can supply authenticated_sender and authenticated_id
3943 via -oMas and -oMai and if so, they will already be set. */
3945 if (authenticated_sender == NULL)
3946 authenticated_sender = string_sprintf("%s@%s", originator_login,
3947 qualify_domain_sender);
3948 if (authenticated_id == NULL) authenticated_id = originator_login;
3951 /* Trusted callers are always permitted to specify the sender address.
3952 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3953 is specified is the empty address. However, if a trusted caller does not
3954 specify a sender address for SMTP input, we leave sender_address unset. This
3955 causes the MAIL commands to be honoured. */
3957 if ((!smtp_input && sender_address == NULL) ||
3958 !receive_check_set_sender(sender_address))
3960 /* Either the caller is not permitted to set a general sender, or this is
3961 non-SMTP input and the trusted caller has not set a sender. If there is no
3962 sender, or if a sender other than <> is set, override with the originator's
3963 login (which will get qualified below), except when checking things. */
3965 if (sender_address == NULL /* No sender_address set */
3967 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3968 !checking && /* Not running tests, AND */
3969 filter_test == FTEST_NONE)) /* Not testing a filter */
3971 sender_address = originator_login;
3972 sender_address_forced = FALSE;
3973 sender_address_domain = 0;
3977 /* Remember whether an untrusted caller set the sender address */
3979 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3981 /* Ensure that the sender address is fully qualified unless it is the empty
3982 address, which indicates an error message, or doesn't exist (root caller, smtp
3983 interface, no -f argument). */
3985 if (sender_address != NULL && sender_address[0] != 0 &&
3986 sender_address_domain == 0)
3987 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
3988 qualify_domain_sender);
3990 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
3992 /* Handle a request to verify a list of addresses, or test them for delivery.
3993 This must follow the setting of the sender address, since routers can be
3994 predicated upon the sender. If no arguments are given, read addresses from
3995 stdin. Set debug_level to at least D_v to get full output for address testing.
3998 if (verify_address_mode || address_test_mode)
4001 int flags = vopt_qualify;
4003 if (verify_address_mode)
4005 if (!verify_as_sender) flags |= vopt_is_recipient;
4006 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4011 flags |= vopt_is_recipient;
4012 debug_selector |= D_v;
4013 debug_file = stderr;
4014 debug_fd = fileno(debug_file);
4015 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4018 if (recipients_arg < argc)
4020 while (recipients_arg < argc)
4022 uschar *s = argv[recipients_arg++];
4025 BOOL finished = FALSE;
4026 uschar *ss = parse_find_address_end(s, FALSE);
4027 if (*ss == ',') *ss = 0; else finished = TRUE;
4028 test_address(s, flags, &exit_value);
4031 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4038 uschar *s = get_stdinput(NULL, NULL);
4039 if (s == NULL) break;
4040 test_address(s, flags, &exit_value);
4044 exim_exit(exit_value);
4047 /* Handle expansion checking */
4051 if (recipients_arg < argc)
4053 while (recipients_arg < argc)
4055 uschar *s = argv[recipients_arg++];
4056 uschar *ss = expand_string(s);
4058 printf ("Failed: %s\n", expand_string_message);
4059 else printf("%s\n", CS ss);
4067 char *(*fn_readline)(char *) = NULL;
4068 char *(*fn_addhist)(char *) = NULL;
4071 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4077 uschar *source = get_stdinput(fn_readline, fn_addhist);
4078 if (source == NULL) break;
4079 ss = expand_string(source);
4081 printf ("Failed: %s\n", expand_string_message);
4082 else printf("%s\n", CS ss);
4086 if (dlhandle != NULL) dlclose(dlhandle);
4090 exim_exit(EXIT_SUCCESS);
4094 /* The active host name is normally the primary host name, but it can be varied
4095 for hosts that want to play several parts at once. We need to ensure that it is
4096 set for host checking, and for receiving messages. */
4098 smtp_active_hostname = primary_hostname;
4099 if (raw_active_hostname != NULL)
4101 uschar *nah = expand_string(raw_active_hostname);
4104 if (!expand_string_forcedfail)
4105 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4106 "(smtp_active_hostname): %s", raw_active_hostname,
4107 expand_string_message);
4109 else if (nah[0] != 0) smtp_active_hostname = nah;
4112 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4113 given IP address so that the blocking and relay configuration can be tested. An
4114 RFC 1413 call is made only if we are running in the test harness and an
4115 incoming interface and both ports are specified, because there is no TCP/IP
4116 call to find the ident for. */
4123 sender_ident = NULL;
4124 if (running_in_test_harness && sender_host_port != 0 &&
4125 interface_address != NULL && interface_port != 0)
4126 verify_get_ident(1413);
4128 /* In case the given address is a non-canonical IPv6 address, canonicize
4129 it. The code works for both IPv4 and IPv6, as it happens. */
4131 size = host_aton(sender_host_address, x);
4132 sender_host_address = store_get(48); /* large enough for full IPv6 */
4133 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4135 /* Now set up for testing */
4137 host_build_sender_fullhost();
4141 sender_local = FALSE;
4142 sender_host_notsocket = TRUE;
4143 debug_file = stderr;
4144 debug_fd = fileno(debug_file);
4145 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4146 "**** but without any ident (RFC 1413) callback.\n"
4147 "**** This is not for real!\n\n",
4148 sender_host_address);
4150 if (verify_check_host(&hosts_connection_nolog) == OK)
4151 log_write_selector &= ~L_smtp_connection;
4152 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4154 if (smtp_start_session())
4156 reset_point = store_get(0);
4159 store_reset(reset_point);
4160 if (smtp_setup_msg() <= 0) break;
4161 if (!receive_msg(FALSE)) break;
4164 exim_exit(EXIT_SUCCESS);
4168 /* Arrange for message reception if recipients or SMTP were specified;
4169 otherwise complain unless a version print (-bV) happened or this is a filter
4170 verification test. In the former case, show the configuration file name. */
4172 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4174 if (version_printed)
4176 printf("Configuration file is %s\n", config_main_filename);
4177 return EXIT_SUCCESS;
4179 if (filter_test == FTEST_NONE)
4182 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4183 "not directly from a shell command line. Options and/or arguments control\n"
4184 "what it does when called. For a list of options, see the Exim documentation.\n");
4185 return EXIT_FAILURE;
4190 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4191 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4192 that we are not called from inetd, because that is rejected above. The
4193 following configuration settings are forced here:
4195 (1) Synchronous delivery (-odi)
4196 (2) Errors to stderr (-oep == -oeq)
4197 (3) No parallel remote delivery
4198 (4) Unprivileged delivery
4200 We don't force overall queueing options because there are several of them;
4201 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4202 to override any SMTP queueing. */
4206 synchronous_delivery = TRUE;
4207 arg_error_handling = ERRORS_STDERR;
4208 remote_max_parallel = 1;
4209 deliver_drop_privilege = TRUE;
4211 queue_smtp_domains = NULL;
4215 /* Prepare to accept one or more new messages on the standard input. When a
4216 message has been read, its id is returned in message_id[]. If doing immediate
4217 delivery, we fork a delivery process for each received message, except for the
4218 last one, where we can save a process switch.
4220 It is only in non-smtp mode that error_handling is allowed to be changed from
4221 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4222 sendmail error modes other than -oem ever actually used? Later: yes.) */
4224 if (!smtp_input) error_handling = arg_error_handling;
4226 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4227 logging being sent down the socket and make an identd call to get the
4233 exim_nullstd(); /* Re-open to /dev/null */
4234 verify_get_ident(IDENT_PORT);
4235 host_build_sender_fullhost();
4236 set_process_info("handling incoming connection from %s via inetd",
4240 /* If the sender host address has been set, build sender_fullhost if it hasn't
4241 already been done (which it will have been for inetd). This caters for the
4242 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4243 so that the test for IP options is skipped for -bs input. */
4245 if (sender_host_address != NULL && sender_fullhost == NULL)
4247 host_build_sender_fullhost();
4248 set_process_info("handling incoming connection from %s via -oMa",
4250 sender_host_notsocket = TRUE;
4253 /* Otherwise, set the sender host as unknown except for inetd calls. This
4254 prevents host checking in the case of -bs not from inetd and also for -bS. */
4256 else if (!is_inetd) sender_host_unknown = TRUE;
4258 /* If stdout does not exist, then dup stdin to stdout. This can happen
4259 if exim is started from inetd. In this case fd 0 will be set to the socket,
4260 but fd 1 will not be set. This also happens for passed SMTP channels. */
4262 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4264 /* Set up the incoming protocol name and the state of the program. Root
4265 is allowed to force received protocol via the -oMr option above, and if we are
4266 in a non-local SMTP state it means we have come via inetd and the process info
4267 has already been set up. We don't set received_protocol here for smtp input,
4268 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4272 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4277 if (received_protocol == NULL)
4278 received_protocol = string_sprintf("local%s", called_as);
4279 set_process_info("accepting a local non-SMTP message from <%s>",
4283 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4287 local_queue_only = queue_only;
4289 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4290 the spool if so configured. On failure, we must not attempt to send an error
4291 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4292 error code is given.) */
4294 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4296 fprintf(stderr, "exim: insufficient disk space\n");
4297 return EXIT_FAILURE;
4300 /* If this is smtp input of any kind, handle the start of the SMTP
4307 if (verify_check_host(&hosts_connection_nolog) == OK)
4308 log_write_selector &= ~L_smtp_connection;
4309 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4310 if (!smtp_start_session())
4313 exim_exit(EXIT_SUCCESS);
4317 /* Otherwise, set up the input size limit here */
4321 thismessage_size_limit = expand_string_integer(message_size_limit);
4322 if (thismessage_size_limit < 0)
4324 if (thismessage_size_limit == -1)
4325 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4326 "message_size_limit: %s", expand_string_message);
4328 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4329 "message_size_limit: %s", expand_string_message);
4333 /* Loop for several messages when reading SMTP input. If we fork any child
4334 processes, we don't want to wait for them unless synchronous delivery is
4335 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4336 same as SIG_DFL, despite the fact that documentation often lists the default as
4337 "ignore". This is a confusing area. This is what I know:
4339 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4340 processes that complete simply to go away without ever becoming defunct. You
4341 can't then wait for them - but we don't want to wait for them in the
4342 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4343 happen for all OS (e.g. *BSD is different).
4345 But that's not the end of the story. Some (many? all?) systems have the
4346 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4347 has by default, so it seems that the difference is merely one of default
4348 (compare restarting vs non-restarting signals).
4350 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4351 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4352 of the loop below. Paranoia rules.
4354 February 2003: That's *still* not the end of the story. There are now versions
4355 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4356 process then calls waitpid(), a grumble is written to the system log, because
4357 this is logically inconsistent. In other words, it doesn't like the paranoia.
4358 As a consequenc of this, the waitpid() below is now excluded if we are sure
4359 that SIG_IGN works. */
4361 if (!synchronous_delivery)
4364 struct sigaction act;
4365 act.sa_handler = SIG_IGN;
4366 sigemptyset(&(act.sa_mask));
4367 act.sa_flags = SA_NOCLDWAIT;
4368 sigaction(SIGCHLD, &act, NULL);
4370 signal(SIGCHLD, SIG_IGN);
4374 /* Save the current store pool point, for resetting at the start of
4375 each message, and save the real sender address, if any. */
4377 reset_point = store_get(0);
4378 real_sender_address = sender_address;
4380 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4381 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4386 store_reset(reset_point);
4389 /* In the SMTP case, we have to handle the initial SMTP input and build the
4390 recipients list, before calling receive_msg() to read the message proper.
4391 Whatever sender address is actually given in the SMTP transaction is
4392 actually ignored for local senders - we use the actual sender, which is
4393 normally either the underlying user running this process or a -f argument
4394 provided by a trusted caller. It is saved in real_sender_address.
4396 However, if this value is NULL, we are dealing with a trusted caller when
4397 -f was not used; in this case, the SMTP sender is allowed to stand.
4399 Also, if untrusted_set_sender is set, we permit sender addresses that match
4400 anything in its list.
4402 The variable raw_sender_address holds the sender address before rewriting. */
4407 if ((rc = smtp_setup_msg()) > 0)
4409 if (real_sender_address != NULL &&
4410 !receive_check_set_sender(sender_address))
4412 sender_address = raw_sender = real_sender_address;
4413 sender_address_unrewritten = NULL;
4415 more = receive_msg(extract_recipients);
4416 if (message_id[0] == 0)
4419 exim_exit(EXIT_FAILURE);
4422 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4425 /* In the non-SMTP case, we have all the information from the command
4426 line, but must process it in case it is in the more general RFC822
4427 format, and in any case, to detect syntax errors. Also, it appears that
4428 the use of comma-separated lists as single arguments is common, so we
4429 had better support them. */
4435 int count = argc - recipients_arg;
4436 uschar **list = argv + recipients_arg;
4438 /* These options cannot be changed dynamically for non-SMTP messages */
4440 active_local_sender_retain = local_sender_retain;
4441 active_local_from_check = local_from_check;
4443 /* Save before any rewriting */
4445 raw_sender = string_copy(sender_address);
4447 /* Loop for each argument */
4449 for (i = 0; i < count; i++)
4451 int start, end, domain;
4453 uschar *s = list[i];
4455 /* Loop for each comma-separated address */
4459 BOOL finished = FALSE;
4461 uschar *ss = parse_find_address_end(s, FALSE);
4463 if (*ss == ',') *ss = 0; else finished = TRUE;
4465 /* Check max recipients - if -t was used, these aren't recipients */
4467 if (recipients_max > 0 && ++rcount > recipients_max &&
4468 !extract_recipients)
4470 if (error_handling == ERRORS_STDERR)
4472 fprintf(stderr, "exim: too many recipients\n");
4473 exim_exit(EXIT_FAILURE);
4478 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4479 errors_sender_rc : EXIT_FAILURE;
4484 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4486 if (domain == 0 && !allow_unqualified_recipient)
4489 errmess = US"unqualified recipient address not allowed";
4492 if (recipient == NULL)
4494 if (error_handling == ERRORS_STDERR)
4496 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4497 string_printing(list[i]), errmess);
4498 exim_exit(EXIT_FAILURE);
4504 eblock.text1 = string_printing(list[i]);
4505 eblock.text2 = errmess;
4507 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4508 errors_sender_rc : EXIT_FAILURE;
4512 receive_add_recipient(recipient, -1);
4515 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4519 /* Show the recipients when debugging */
4524 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4525 if (recipients_list != NULL)
4527 debug_printf("Recipients:\n");
4528 for (i = 0; i < recipients_count; i++)
4529 debug_printf(" %s\n", recipients_list[i].address);
4533 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4534 will just read the headers for the message, and not write anything onto the
4537 message_ended = END_NOTENDED;
4538 more = receive_msg(extract_recipients);
4540 /* more is always FALSE here (not SMTP message) when reading a message
4541 for real; when reading the headers of a message for filter testing,
4542 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4544 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4545 } /* Non-SMTP message reception */
4547 /* If this is a filter testing run, there are headers in store, but
4548 no message on the spool. Run the filtering code in testing mode, setting
4549 the domain to the qualify domain and the local part to the current user,
4550 unless they have been set by options. The prefix and suffix are left unset
4551 unless specified. The the return path is set to to the sender unless it has
4552 already been set from a return-path header in the message. */
4554 if (filter_test != FTEST_NONE)
4556 deliver_domain = (ftest_domain != NULL)?
4557 ftest_domain : qualify_domain_recipient;
4558 deliver_domain_orig = deliver_domain;
4559 deliver_localpart = (ftest_localpart != NULL)?
4560 ftest_localpart : originator_login;
4561 deliver_localpart_orig = deliver_localpart;
4562 deliver_localpart_prefix = ftest_prefix;
4563 deliver_localpart_suffix = ftest_suffix;
4564 deliver_home = originator_home;
4566 if (return_path == NULL)
4568 printf("Return-path copied from sender\n");
4569 return_path = string_copy(sender_address);
4573 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4575 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4577 receive_add_recipient(
4578 string_sprintf("%s%s%s@%s",
4579 (ftest_prefix == NULL)? US"" : ftest_prefix,
4581 (ftest_suffix == NULL)? US"" : ftest_suffix,
4582 deliver_domain), -1);
4584 printf("Recipient = %s\n", recipients_list[0].address);
4585 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4586 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4588 chdir("/"); /* Get away from wherever the user is running this from */
4590 /* Now we run either a system filter test, or a user filter test, or both.
4591 In the latter case, headers added by the system filter will persist and be
4592 available to the user filter. We need to copy the filter variables
4595 if ((filter_test & FTEST_SYSTEM) != 0)
4597 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4598 exim_exit(EXIT_FAILURE);
4601 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4603 if ((filter_test & FTEST_USER) != 0)
4605 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4606 exim_exit(EXIT_FAILURE);
4609 exim_exit(EXIT_SUCCESS);
4612 /* Else act on the result of message reception. We should not get here unless
4613 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4614 TRUE. If it is not, check on the number of messages received in this
4615 connection. If that's OK and queue_only_load is set, check that the load
4616 average is below it. If it is not, set local_queue_only TRUE. Note that it
4617 then remains this way for any subsequent messages on the same SMTP connection.
4618 This is a deliberate choice; even though the load average may fall, it
4619 doesn't seem right to deliver later messages on the same call when not
4620 delivering earlier ones. */
4622 if (!local_queue_only)
4624 if (smtp_accept_queue_per_connection > 0 &&
4625 receive_messagecount > smtp_accept_queue_per_connection)
4627 local_queue_only = TRUE;
4628 queue_only_reason = 2;
4630 else if (queue_only_load >= 0)
4632 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4633 if (local_queue_only) queue_only_reason = 3;
4637 /* If running as an MUA wrapper, all queueing options and freezing options
4641 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4643 /* Log the queueing here, when it will get a message id attached, but
4644 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4647 if (local_queue_only) switch(queue_only_reason)
4650 log_write(L_delay_delivery,
4651 LOG_MAIN, "no immediate delivery: more than %d messages "
4652 "received in one connection", smtp_accept_queue_per_connection);
4656 log_write(L_delay_delivery,
4657 LOG_MAIN, "no immediate delivery: load average %.2f",
4658 (double)load_average/1000.0);
4662 /* Else do the delivery unless the ACL or local_scan() called for queue only
4663 or froze the message. Always deliver in a separate process. A fork failure is
4664 not a disaster, as the delivery will eventually happen on a subsequent queue
4665 run. The search cache must be tidied before the fork, as the parent will
4666 do it before exiting. The child will trigger a lookup failure and
4667 thereby defer the delivery if it tries to use (for example) a cached ldap
4668 connection that the parent has called unbind on. */
4670 else if (!queue_only_policy && !deliver_freeze)
4675 if ((pid = fork()) == 0)
4678 close_unwanted(); /* Close unwanted file descriptors and TLS */
4679 exim_nullstd(); /* Ensure std{in,out,err} exist */
4681 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4682 mode, deliver_drop_privilege is forced TRUE). */
4684 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4686 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4688 /* Control does not return here. */
4691 /* No need to re-exec */
4693 rc = deliver_message(message_id, FALSE, FALSE);
4695 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4696 EXIT_SUCCESS : EXIT_FAILURE);
4701 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4702 "process: %s", strerror(errno));
4705 /* In the parent, wait if synchronous delivery is required. This will
4706 always be the case in MUA wrapper mode. */
4708 else if (synchronous_delivery)
4711 while (wait(&status) != pid);
4712 if ((status & 0x00ff) != 0)
4713 log_write(0, LOG_MAIN|LOG_PANIC,
4714 "process %d crashed with signal %d while delivering %s",
4715 (int)pid, status & 0x00ff, message_id);
4716 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4720 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4721 automatically reaps children (see comments above the loop), clear away any
4722 finished subprocesses here, in case there are lots of messages coming in
4723 from the same source. */
4725 #ifndef SIG_IGN_WORKS
4726 while (waitpid(-1, NULL, WNOHANG) > 0);
4730 exim_exit(EXIT_SUCCESS); /* Never returns */
4731 return 0; /* To stop compiler warning */