1 /* $Cambridge: exim/src/src/exim.c,v 1.11 2004/12/16 15:11:47 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2004 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
402 for (i = 0; i <= 2; i++)
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) dup2(devnull, i);
412 if (devnull > 2) close(devnull);
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
441 Exception: We do want it for synchronous delivery!
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
460 tls_close(FALSE); /* Shut down the TLS library */
462 close(fileno(smtp_in));
463 close(fileno(smtp_out));
468 close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address.
592 address the address, with possible port on the end
594 Returns: the port, or zero if there isn't one
595 bombs out on a syntax error
599 check_port(uschar *address)
601 int port = host_extract_port(address);
602 if (!string_is_ip_address(address, NULL))
604 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
612 /*************************************************
613 * Test/verify an address *
614 *************************************************/
616 /* This function is called by the -bv and -bt code. It extracts a working
617 address from a full RFC 822 address. This isn't really necessary per se, but it
618 has the effect of collapsing source routes.
622 flags flag bits for verify_address()
623 exit_value to be set for failures
629 test_address(uschar *s, int flags, int *exit_value)
631 int start, end, domain;
632 uschar *parse_error = NULL;
633 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
637 fprintf(stdout, "syntax error: %s\n", parse_error);
642 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
643 -1, -1, NULL, NULL, NULL);
644 if (rc == FAIL) *exit_value = 2;
645 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
651 /*************************************************
652 * Decode bit settings for log/debug *
653 *************************************************/
655 /* This function decodes a string containing bit settings in the form of +name
656 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
657 also recognizes a numeric setting of the form =<number>, but this is not
658 intended for user use. It's an easy way for Exim to pass the debug settings
659 when it is re-exec'ed.
661 The log options are held in two unsigned ints (because there became too many
662 for one). The top bit in the table means "put in 2nd selector". This does not
663 yet apply to debug options, so the "=" facility sets only the first selector.
665 A bad value for a debug setting is treated as an unknown option - error message
666 to stderr and die. For log settings, which come from the configuration file,
667 we write to the log on the way out...
670 selector1 address of the first bit string
671 selector2 address of the second bit string, or NULL
672 string the configured string
673 options the table of option names
675 which "log" or "debug"
677 Returns: nothing on success - bomb out on failure
681 decode_bits(unsigned int *selector1, unsigned int *selector2, uschar *string,
682 bit_table *options, int count, uschar *which)
685 if (string == NULL) return;
689 char *end; /* Not uschar */
690 *selector1 = strtoul(CS string+1, &end, 0);
691 if (*end == 0) return;
692 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
697 /* Handle symbolic setting */
704 bit_table *start, *end;
706 while (isspace(*string)) string++;
707 if (*string == 0) return;
709 if (*string != '+' && *string != '-')
711 errmsg = string_sprintf("malformed %s_selector setting: "
712 "+ or - expected but found \"%s\"", which, string);
716 adding = *string++ == '+';
718 while (isalnum(*string) || *string == '_') string++;
722 end = options + count;
726 bit_table *middle = start + (end - start)/2;
727 int c = Ustrncmp(s, middle->name, len);
730 if (middle->name[len] != 0) c = -1; else
732 unsigned int bit = middle->bit;
733 unsigned int *selector;
735 /* The value with all bits set means "set all bits in both selectors"
736 in the case where two are being handled. However, the top bit in the
737 second selector is never set. */
739 if (bit == 0xffffffff)
741 *selector1 = adding? bit : 0;
742 if (selector2 != NULL) *selector2 = adding? 0x7fffffff : 0;
745 /* Otherwise, the 0x80000000 bit means "this value, without the top
746 bit, belongs in the second selector". */
750 if ((bit & 0x80000000) != 0)
752 selector = selector2;
755 else selector = selector1;
756 if (adding) *selector |= bit; else *selector &= ~bit;
758 break; /* Out of loop to match selector name */
761 if (c < 0) end = middle; else start = middle + 1;
762 } /* Loop to match selector name */
766 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
767 adding? '+' : '-', len, s);
770 } /* Loop for selector names */
772 /* Handle disasters */
775 if (Ustrcmp(which, "debug") == 0)
777 fprintf(stderr, "exim: %s\n", errmsg);
780 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
785 /*************************************************
786 * Show supported features *
787 *************************************************/
789 /* This function is called for -bV and for -d to output the optional features
790 of the current Exim binary.
792 Arguments: a FILE for printing
797 show_whats_supported(FILE *f)
799 #ifdef DB_VERSION_STRING
800 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
801 #elif defined(BTREEVERSION) && defined(HASHVERSION)
803 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
805 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
807 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
808 fprintf(f, "Probably ndbm\n");
809 #elif defined(USE_TDB)
810 fprintf(f, "Using tdb\n");
813 fprintf(f, "Probably GDBM (native mode)\n");
815 fprintf(f, "Probably GDBM (compatibility mode)\n");
819 fprintf(f, "Support for:");
821 fprintf(f, " iconv()");
832 #ifdef USE_TCP_WRAPPERS
833 fprintf(f, " TCPwrappers");
837 fprintf(f, " GnuTLS");
839 fprintf(f, " OpenSSL");
842 #ifdef WITH_CONTENT_SCAN
843 fprintf(f, " Content_Scanning");
845 #ifdef WITH_OLD_DEMIME
846 fprintf(f, " Old_Demime");
848 #ifdef EXPERIMENTAL_SPF
849 fprintf(f, " Experimental_SPF");
851 #ifdef EXPERIMENTAL_SRS
852 fprintf(f, " Experimental_SRS");
854 #ifdef EXPERIMENTAL_BRIGHTMAIL
855 fprintf(f, " Experimental_Brightmail");
859 fprintf(f, "Lookups:");
860 #ifdef LOOKUP_LSEARCH
861 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
867 fprintf(f, " dbm dbmnz");
870 fprintf(f, " dnsdb");
872 #ifdef LOOKUP_DSEARCH
873 fprintf(f, " dsearch");
876 fprintf(f, " ibase");
879 fprintf(f, " ldap ldapdn ldapm");
882 fprintf(f, " mysql");
885 fprintf(f, " nis nis0");
887 #ifdef LOOKUP_NISPLUS
888 fprintf(f, " nisplus");
891 fprintf(f, " oracle");
894 fprintf(f, " passwd");
897 fprintf(f, " pgsql");
900 fprintf(f, " testdb");
903 fprintf(f, " whoson");
907 fprintf(f, "Authenticators:");
909 fprintf(f, " cram_md5");
911 #ifdef AUTH_CYRUS_SASL
912 fprintf(f, " cyrus_sasl");
914 #ifdef AUTH_PLAINTEXT
915 fprintf(f, " plaintext");
922 fprintf(f, "Routers:");
924 fprintf(f, " accept");
926 #ifdef ROUTER_DNSLOOKUP
927 fprintf(f, " dnslookup");
929 #ifdef ROUTER_IPLITERAL
930 fprintf(f, " ipliteral");
932 #ifdef ROUTER_IPLOOKUP
933 fprintf(f, " iplookup");
935 #ifdef ROUTER_MANUALROUTE
936 fprintf(f, " manualroute");
938 #ifdef ROUTER_QUERYPROGRAM
939 fprintf(f, " queryprogram");
941 #ifdef ROUTER_REDIRECT
942 fprintf(f, " redirect");
946 fprintf(f, "Transports:");
947 #ifdef TRANSPORT_APPENDFILE
948 fprintf(f, " appendfile");
949 #ifdef SUPPORT_MAILDIR
950 fprintf(f, "/maildir");
952 #ifdef SUPPORT_MAILSTORE
953 fprintf(f, "/mailstore");
959 #ifdef TRANSPORT_AUTOREPLY
960 fprintf(f, " autoreply");
962 #ifdef TRANSPORT_LMTP
965 #ifdef TRANSPORT_PIPE
968 #ifdef TRANSPORT_SMTP
973 if (fixed_never_users[0] > 0)
976 fprintf(f, "Fixed never_users: ");
977 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
978 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
979 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
986 /*************************************************
987 * Quote a local part *
988 *************************************************/
990 /* This function is used when a sender address or a From: or Sender: header
991 line is being created from the caller's login, or from an authenticated_id. It
992 applies appropriate quoting rules for a local part.
994 Argument: the local part
995 Returns: the local part, quoted if necessary
999 local_part_quote(uschar *lpart)
1001 BOOL needs_quote = FALSE;
1006 for (t = lpart; !needs_quote && *t != 0; t++)
1008 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1009 (*t != '.' || t == lpart || t[1] == 0);
1012 if (!needs_quote) return lpart;
1015 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1019 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1022 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1025 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1026 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1027 yield = string_cat(yield, &size, &ptr, nq, 1);
1031 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1039 /*************************************************
1040 * Load readline() functions *
1041 *************************************************/
1043 /* This function is called from testing executions that read data from stdin,
1044 but only when running as the calling user. Currently, only -be does this. The
1045 function loads the readline() function library and passes back the functions.
1046 On some systems, it needs the curses library, so load that too, but try without
1047 it if loading fails. All this functionality has to be requested at build time.
1050 fn_readline_ptr pointer to where to put the readline pointer
1051 fn_addhist_ptr pointer to where to put the addhistory function
1053 Returns: the dlopen handle or NULL on failure
1057 set_readline(char * (**fn_readline_ptr)(char *),
1058 char * (**fn_addhist_ptr)(char *))
1061 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1063 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1064 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1066 if (dlhandle != NULL)
1068 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1069 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1073 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1082 /*************************************************
1083 * Get a line from stdin for testing things *
1084 *************************************************/
1086 /* This function is called when running tests that can take a number of lines
1087 of input (for example, -be and -bt). It handles continuations and trailing
1088 spaces. And prompting and a blank line output on eof. If readline() is in use,
1089 the arguments are non-NULL and provide the relevant functions.
1092 fn_readline readline function or NULL
1093 fn_addhist addhist function or NULL
1095 Returns: pointer to dynamic memory, or NULL at end of file
1099 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1104 uschar *yield = NULL;
1106 if (fn_readline == NULL) printf("> ");
1110 uschar buffer[1024];
1114 char *readline_line = NULL;
1115 if (fn_readline != NULL)
1117 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1118 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1119 p = US readline_line;
1124 /* readline() not in use */
1127 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1131 /* Handle the line */
1133 ss = p + (int)Ustrlen(p);
1134 while (ss > p && isspace(ss[-1])) ss--;
1138 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1141 yield = string_cat(yield, &size, &ptr, p, ss - p);
1144 if (fn_readline != NULL) free(readline_line);
1147 if (ss == p || yield[ptr-1] != '\\')
1155 if (yield == NULL) printf("\n");
1161 /*************************************************
1162 * Entry point and high-level code *
1163 *************************************************/
1165 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1166 the appropriate action. All the necessary functions are present in the one
1167 binary. I originally thought one should split it up, but it turns out that so
1168 much of the apparatus is needed in each chunk that one might as well just have
1169 it all available all the time, which then makes the coding easier as well.
1172 argc count of entries in argv
1173 argv argument strings, with argv[0] being the program name
1175 Returns: EXIT_SUCCESS if terminated successfully
1176 EXIT_FAILURE otherwise, except when a message has been sent
1177 to the sender, and -oee was given
1181 main(int argc, char **cargv)
1183 uschar **argv = USS cargv;
1184 int arg_receive_timeout = -1;
1185 int arg_smtp_receive_timeout = -1;
1186 int arg_error_handling = error_handling;
1187 int filter_sfd = -1;
1188 int filter_ufd = -1;
1191 int list_queue_option = 0;
1193 int msg_action_arg = -1;
1194 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1195 int queue_only_reason = 0;
1197 int perl_start_option = 0;
1199 int recipients_arg = argc;
1200 int sender_address_domain = 0;
1201 int test_retry_arg = -1;
1202 int test_rewrite_arg = -1;
1203 BOOL arg_queue_only = FALSE;
1204 BOOL bi_option = FALSE;
1205 BOOL checking = FALSE;
1206 BOOL count_queue = FALSE;
1207 BOOL expansion_test = FALSE;
1208 BOOL extract_recipients = FALSE;
1209 BOOL forced_delivery = FALSE;
1210 BOOL f_end_dot = FALSE;
1211 BOOL deliver_give_up = FALSE;
1212 BOOL list_queue = FALSE;
1213 BOOL list_options = FALSE;
1214 BOOL local_queue_only;
1216 BOOL one_msg_action = FALSE;
1217 BOOL queue_only_set = FALSE;
1218 BOOL receiving_message = TRUE;
1220 BOOL removed_privilege = FALSE;
1221 BOOL verify_address_mode = FALSE;
1222 BOOL verify_as_sender = FALSE;
1223 BOOL version_printed = FALSE;
1224 uschar *alias_arg = NULL;
1225 uschar *called_as = US"";
1226 uschar *start_queue_run_id = NULL;
1227 uschar *stop_queue_run_id = NULL;
1228 uschar *ftest_domain = NULL;
1229 uschar *ftest_localpart = NULL;
1230 uschar *ftest_prefix = NULL;
1231 uschar *ftest_suffix = NULL;
1232 uschar *real_sender_address;
1233 uschar *originator_home = US"/";
1237 struct stat statbuf;
1238 pid_t passed_qr_pid = (pid_t)0;
1239 int passed_qr_pipe = -1;
1240 gid_t group_list[NGROUPS_MAX];
1242 /* Possible options for -R and -S */
1244 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1246 /* Need to define this in case we need to change the environment in order
1247 to get rid of a bogus time zone. We have to make it char rather than uschar
1248 because some OS define it in /usr/include/unistd.h. */
1250 extern char **environ;
1252 /* If the Exim user and/or group and/or the configuration file owner/group were
1253 defined by ref:name at build time, we must now find the actual uid/gid values.
1254 This is a feature to make the lives of binary distributors easier. */
1256 #ifdef EXIM_USERNAME
1257 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1259 exim_gid = pw->pw_gid;
1263 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1269 #ifdef EXIM_GROUPNAME
1270 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1272 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1278 #ifdef CONFIGURE_OWNERNAME
1279 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1281 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1282 CONFIGURE_OWNERNAME);
1287 #ifdef CONFIGURE_GROUPNAME
1288 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1290 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1291 CONFIGURE_GROUPNAME);
1296 /* In the Cygwin environment, some initialization needs doing. It is fudged
1297 in by means of this macro. */
1303 /* Check a field which is patched when we are running Exim within its
1304 testing harness; do a fast initial check, and then the whole thing. */
1306 running_in_test_harness =
1307 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1309 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1310 at the start of a program; however, it seems that some environments do not
1311 follow this. A "strange" locale can affect the formatting of timestamps, so we
1314 setlocale(LC_ALL, "C");
1316 /* Set up the default handler for timing using alarm(). */
1318 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1320 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1321 because store_malloc writes a log entry on failure. */
1323 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1324 if (log_buffer == NULL)
1326 fprintf(stderr, "exim: failed to get store for log buffer\n");
1330 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1331 NULL when the daemon is run and the file is closed. We have to use this
1332 indirection, because some systems don't allow writing to the variable "stderr".
1335 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1337 /* Arrange for the PCRE regex library to use our store functions. Note that
1338 the normal calls are actually macros that add additional arguments for
1339 debugging purposes so we have to assign specially constructed functions here.
1340 The default is to use store in the stacking pool, but this is overridden in the
1341 regex_must_compile() function. */
1343 pcre_malloc = function_store_get;
1344 pcre_free = function_dummy_free;
1346 /* Ensure there is a big buffer for temporary use in several places. It is put
1347 in malloc store so that it can be freed for enlargement if necessary. */
1349 big_buffer = store_malloc(big_buffer_size);
1351 /* Set up the handler for the data request signal, and set the initial
1352 descriptive text. */
1354 set_process_info("initializing");
1355 os_restarting_signal(SIGUSR1, usr1_handler);
1357 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1358 in the daemon code. For the rest of Exim's uses, we ignore it. */
1360 signal(SIGHUP, SIG_IGN);
1362 /* We don't want to die on pipe errors as the code is written to handle
1363 the write error instead. */
1365 signal(SIGPIPE, SIG_IGN);
1367 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1368 set to SIG_IGN. This causes subprocesses that complete before the parent
1369 process waits for them not to hang around, so when Exim calls wait(), nothing
1370 is there. The wait() code has been made robust against this, but let's ensure
1371 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1372 ending status. We use sigaction rather than plain signal() on those OS where
1373 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1374 problem on AIX with this.) */
1378 struct sigaction act;
1379 act.sa_handler = SIG_DFL;
1380 sigemptyset(&(act.sa_mask));
1382 sigaction(SIGCHLD, &act, NULL);
1385 signal(SIGCHLD, SIG_DFL);
1388 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1393 /* Set up the version number. Set up the leading 'E' for the external form of
1394 message ids, set the pointer to the internal form, and initialize it to
1395 indicate no message being processed. */
1398 message_id_option[0] = '-';
1399 message_id_external = message_id_option + 1;
1400 message_id_external[0] = 'E';
1401 message_id = message_id_external + 1;
1404 /* Set the umask to zero so that any files that Exim creates are created
1405 with the modes that it specifies. */
1409 /* Precompile the regular expression for matching a message id. Keep this in
1410 step with the code that generates ids in the accept.c module. We need to do
1411 this here, because the -M options check their arguments for syntactic validity
1412 using mac_ismsgid, which uses this. */
1415 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1417 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1418 this seems to be a generally accepted convention, since one finds symbolic
1419 links called "mailq" in standard OS configurations. */
1421 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1422 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1425 receiving_message = FALSE;
1426 called_as = US"-mailq";
1429 /* If the program is called as "rmail" treat it as equivalent to
1430 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1431 i.e. preventing a single dot on a line from terminating the message, and
1432 returning with zero return code, even in cases of error (provided an error
1433 message has been sent). */
1435 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1436 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1439 called_as = US"-rmail";
1440 errors_sender_rc = EXIT_SUCCESS;
1443 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1444 this is a smail convention. */
1446 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1447 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1449 smtp_input = smtp_batched_input = TRUE;
1450 called_as = US"-rsmtp";
1453 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1454 this is a smail convention. */
1456 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1457 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1460 receiving_message = FALSE;
1461 called_as = US"-runq";
1464 /* If the program is called as "newaliases" treat it as equivalent to
1465 "exim -bi"; this is a sendmail convention. */
1467 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1468 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1471 receiving_message = FALSE;
1472 called_as = US"-newaliases";
1475 /* Save the original effective uid for a couple of uses later. It should
1476 normally be root, but in some esoteric environments it may not be. */
1478 original_euid = geteuid();
1480 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1481 to be the same as the real ones. This makes a difference only if Exim is setuid
1482 (or setgid) to something other than root, which could be the case in some
1483 special configurations. */
1485 real_uid = getuid();
1486 real_gid = getgid();
1488 if (real_uid == root_uid)
1494 /* If neither the original real uid nor the original euid was root, Exim is
1495 running in an unprivileged state. */
1497 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1499 /* If the first argument is --help, pretend there are no arguments. This will
1500 cause a brief message to be given. */
1502 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1504 /* Scan the program's arguments. Some can be dealt with right away; others are
1505 simply recorded for checking and handling afterwards. Do a high-level switch
1506 on the second character (the one after '-'), to save some effort. */
1508 for (i = 1; i < argc; i++)
1510 BOOL badarg = FALSE;
1511 uschar *arg = argv[i];
1515 /* An argument not starting with '-' is the start of a recipients list;
1516 break out of the options-scanning loop. */
1524 /* An option consistion of -- terminates the options */
1526 if (Ustrcmp(arg, "--") == 0)
1528 recipients_arg = i + 1;
1532 /* Handle flagged options */
1534 switchchar = arg[1];
1537 /* Make all -ex options synonymous with -oex arguments, since that
1538 is assumed by various callers. Also make -qR options synonymous with -R
1539 options, as that seems to be required as well. Allow for -qqR too, and
1540 the same for -S options. */
1542 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1543 Ustrncmp(arg+1, "qR", 2) == 0 ||
1544 Ustrncmp(arg+1, "qS", 2) == 0)
1546 switchchar = arg[2];
1549 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1551 switchchar = arg[3];
1553 queue_2stage = TRUE;
1556 /* Make -r synonymous with -f, since it is a documented alias */
1558 else if (arg[1] == 'r') switchchar = 'f';
1560 /* Make -ov synonymous with -v */
1562 else if (Ustrcmp(arg, "-ov") == 0)
1568 /* High-level switch on active initial letter */
1572 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1573 so has no need of it. */
1576 if (*argrest == 0) i++; /* Skip over the type */
1581 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1583 /* -bd: Run in daemon mode, awaiting SMTP connections.
1584 -bdf: Ditto, but in the foreground.
1587 if (*argrest == 'd')
1589 daemon_listen = TRUE;
1590 if (*(++argrest) == 'f') background_daemon = FALSE;
1591 else if (*argrest != 0) { badarg = TRUE; break; }
1594 /* -be: Run in expansion test mode */
1596 else if (*argrest == 'e')
1597 expansion_test = checking = TRUE;
1599 /* -bF: Run system filter test */
1601 else if (*argrest == 'F')
1603 filter_test |= FTEST_SYSTEM;
1604 if (*(++argrest) != 0) { badarg = TRUE; break; }
1605 if (++i < argc) filter_test_sfile = argv[i]; else
1607 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1612 /* -bf: Run user filter test
1613 -bfd: Set domain for filter testing
1614 -bfl: Set local part for filter testing
1615 -bfp: Set prefix for filter testing
1616 -bfs: Set suffix for filter testing
1619 else if (*argrest == 'f')
1621 if (*(++argrest) == 0)
1623 filter_test |= FTEST_USER;
1624 if (++i < argc) filter_test_ufile = argv[i]; else
1626 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1634 fprintf(stderr, "exim: string expected after %s\n", arg);
1637 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1638 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1639 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1640 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1641 else { badarg = TRUE; break; }
1645 /* -bh: Host checking - an IP address must follow. */
1647 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1649 if (++i >= argc) { badarg = TRUE; break; }
1650 sender_host_address = argv[i];
1651 host_checking = checking = log_testing_mode = TRUE;
1652 host_checking_callout = argrest[1] == 'c';
1655 /* -bi: This option is used by sendmail to initialize *the* alias file,
1656 though it has the -oA option to specify a different file. Exim has no
1657 concept of *the* alias file, but since Sun's YP make script calls
1658 sendmail this way, some support must be provided. */
1660 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1662 /* -bm: Accept and deliver message - the default option. Reinstate
1663 receiving_message, which got turned off for all -b options. */
1665 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1667 /* -bnq: For locally originating messages, do not qualify unqualified
1668 addresses. In the envelope, this causes errors; in header lines they
1671 else if (Ustrcmp(argrest, "nq") == 0)
1673 allow_unqualified_sender = FALSE;
1674 allow_unqualified_recipient = FALSE;
1677 /* -bpxx: List the contents of the mail queue, in various forms. If
1678 the option is -bpc, just a queue count is needed. Otherwise, if the
1679 first letter after p is r, then order is random. */
1681 else if (*argrest == 'p')
1683 if (*(++argrest) == 'c')
1686 if (*(++argrest) != 0) badarg = TRUE;
1690 if (*argrest == 'r')
1692 list_queue_option = 8;
1695 else list_queue_option = 0;
1699 /* -bp: List the contents of the mail queue, top-level only */
1701 if (*argrest == 0) {}
1703 /* -bpu: List the contents of the mail queue, top-level undelivered */
1705 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1707 /* -bpa: List the contents of the mail queue, including all delivered */
1709 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1711 /* Unknown after -bp[r] */
1721 /* -bP: List the configuration variables given as the address list.
1722 Force -v, so configuration errors get displayed. */
1724 else if (Ustrcmp(argrest, "P") == 0)
1726 list_options = TRUE;
1727 debug_selector |= D_v;
1728 debug_file = stderr;
1731 /* -brt: Test retry configuration lookup */
1733 else if (Ustrcmp(argrest, "rt") == 0)
1735 test_retry_arg = i + 1;
1739 /* -brw: Test rewrite configuration */
1741 else if (Ustrcmp(argrest, "rw") == 0)
1743 test_rewrite_arg = i + 1;
1747 /* -bS: Read SMTP commands on standard input, but produce no replies -
1748 all errors are reported by sending messages. */
1750 else if (Ustrcmp(argrest, "S") == 0)
1751 smtp_input = smtp_batched_input = receiving_message = TRUE;
1753 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1754 on standard output. */
1756 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1758 /* -bt: address testing mode */
1760 else if (Ustrcmp(argrest, "t") == 0)
1761 address_test_mode = checking = log_testing_mode = TRUE;
1763 /* -bv: verify addresses */
1765 else if (Ustrcmp(argrest, "v") == 0)
1766 verify_address_mode = checking = log_testing_mode = TRUE;
1768 /* -bvs: verify sender addresses */
1770 else if (Ustrcmp(argrest, "vs") == 0)
1772 verify_address_mode = checking = log_testing_mode = TRUE;
1773 verify_as_sender = TRUE;
1776 /* -bV: Print version string and support details */
1778 else if (Ustrcmp(argrest, "V") == 0)
1780 printf("Exim version %s #%s built %s\n", version_string,
1781 version_cnumber, version_date);
1782 printf("%s\n", CS version_copyright);
1783 version_printed = TRUE;
1784 show_whats_supported(stdout);
1791 /* -C: change configuration file list; ignore if it isn't really
1792 a change! Enforce a prefix check if required. */
1797 if(++i < argc) argrest = argv[i]; else
1798 { badarg = TRUE; break; }
1800 if (Ustrcmp(config_main_filelist, argrest) != 0)
1802 #ifdef ALT_CONFIG_PREFIX
1804 int len = Ustrlen(ALT_CONFIG_PREFIX);
1805 uschar *list = argrest;
1807 while((filename = string_nextinlist(&list, &sep, big_buffer,
1808 big_buffer_size)) != NULL)
1810 if ((Ustrlen(filename) < len ||
1811 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1812 Ustrstr(filename, "/../") != NULL) &&
1813 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1815 fprintf(stderr, "-C Permission denied\n");
1821 config_main_filelist = argrest;
1822 config_changed = TRUE;
1827 /* -D: set up a macro definition */
1830 #ifdef DISABLE_D_OPTION
1831 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1836 macro_item *mlast = NULL;
1839 uschar *s = argrest;
1841 while (isspace(*s)) s++;
1843 if (*s < 'A' || *s > 'Z')
1845 fprintf(stderr, "exim: macro name set by -D must start with "
1846 "an upper case letter\n");
1850 while (isalnum(*s) || *s == '_')
1852 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1856 if (ptr == 0) { badarg = TRUE; break; }
1857 while (isspace(*s)) s++;
1860 if (*s++ != '=') { badarg = TRUE; break; }
1861 while (isspace(*s)) s++;
1864 for (m = macros; m != NULL; m = m->next)
1866 if (Ustrcmp(m->name, name) == 0)
1868 fprintf(stderr, "exim: duplicated -D in command line\n");
1874 m = store_get(sizeof(macro_item) + Ustrlen(name));
1876 m->command_line = TRUE;
1877 if (mlast == NULL) macros = m; else mlast->next = m;
1878 Ustrcpy(m->name, name);
1879 m->replacement = string_copy(s);
1881 if (clmacro_count >= MAX_CLMACROS)
1883 fprintf(stderr, "exim: too many -D options on command line\n");
1886 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1892 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1893 The latter is now a no-op, retained for compatibility only. If -dd is used,
1894 debugging subprocesses of the daemon is disabled. */
1897 if (Ustrcmp(argrest, "ropcr") == 0)
1899 /* drop_cr = TRUE; */
1902 /* Use an intermediate variable so that we don't set debugging while
1903 decoding the debugging bits. */
1907 unsigned int selector = D_default;
1910 if (*argrest == 'd')
1912 debug_daemon = TRUE;
1916 decode_bits(&selector, NULL, argrest, debug_options,
1917 debug_options_count, US"debug");
1918 debug_selector = selector;
1923 /* -E: This is a local error message. This option is not intended for
1924 external use at all, but is not restricted to trusted callers because it
1925 does no harm (just suppresses certain error messages) and if Exim is run
1926 not setuid root it won't always be trusted when it generates error
1927 messages using this option. If there is a message id following -E, point
1928 message_reference at it, for logging. */
1931 local_error_message = TRUE;
1932 if (mac_ismsgid(argrest)) message_reference = argrest;
1936 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1937 option, so it looks as if historically the -oex options are also callable
1938 without the leading -o. So we have to accept them. Before the switch,
1939 anything starting -oe has been converted to -e. Exim does not support all
1940 of the sendmail error options. */
1943 if (Ustrcmp(argrest, "e") == 0)
1945 arg_error_handling = ERRORS_SENDER;
1946 errors_sender_rc = EXIT_SUCCESS;
1948 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1949 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1950 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1951 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1956 /* -F: Set sender's full name, used instead of the gecos entry from
1957 the password file. Since users can usually alter their gecos entries,
1958 there's no security involved in using this instead. The data can follow
1959 the -F or be in the next argument. */
1964 if(++i < argc) argrest = argv[i]; else
1965 { badarg = TRUE; break; }
1967 originator_name = argrest;
1971 /* -f: Set sender's address - this value is only actually used if Exim is
1972 run by a trusted user, or if untrusted_set_sender is set and matches the
1973 address, except that the null address can always be set by any user. The
1974 test for this happens later, when the value given here is ignored when not
1975 permitted. For an untrusted user, the actual sender is still put in Sender:
1976 if it doesn't match the From: header (unless no_local_from_check is set).
1977 The data can follow the -f or be in the next argument. The -r switch is an
1978 obsolete form of -f but since there appear to be programs out there that
1979 use anything that sendmail has ever supported, better accept it - the
1980 synonymizing is done before the switch above.
1982 At this stage, we must allow domain literal addresses, because we don't
1983 know what the setting of allow_domain_literals is yet. Ditto for trailing
1984 dots and strip_trailing_dot. */
1992 if (i+1 < argc) argrest = argv[++i]; else
1993 { badarg = TRUE; break; }
1997 sender_address = string_sprintf(""); /* Ensure writeable memory */
2001 uschar *temp = argrest + Ustrlen(argrest) - 1;
2002 while (temp >= argrest && isspace(*temp)) temp--;
2003 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2004 allow_domain_literals = TRUE;
2005 strip_trailing_dot = TRUE;
2006 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2007 &sender_address_domain, TRUE);
2008 allow_domain_literals = FALSE;
2009 strip_trailing_dot = FALSE;
2010 if (sender_address == NULL)
2012 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2013 return EXIT_FAILURE;
2016 sender_address_forced = TRUE;
2020 /* This is some Sendmail thing which can be ignored */
2025 /* -h: Set the hop count for an incoming message. Exim does not currently
2026 support this; it always computes it by counting the Received: headers.
2027 To put it in will require a change to the spool header file format. */
2032 if(++i < argc) argrest = argv[i]; else
2033 { badarg = TRUE; break; }
2035 if (!isdigit(*argrest)) badarg = TRUE;
2039 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2040 not to be documented for sendmail but mailx (at least) uses it) */
2043 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2048 receiving_message = FALSE;
2050 /* -MC: continue delivery of another message via an existing open
2051 file descriptor. This option is used for an internal call by the
2052 smtp transport when there is a pending message waiting to go to an
2053 address to which it has got a connection. Five subsequent arguments are
2054 required: transport name, host name, IP address, sequence number, and
2055 message_id. Transports may decline to create new processes if the sequence
2056 number gets too big. The channel is stdin. This (-MC) must be the last
2057 argument. There's a subsequent check that the real-uid is privileged.
2059 If we are running in the test harness. delay for a bit, to let the process
2060 that set this one up complete. This makes for repeatability of the logging,
2063 if (Ustrcmp(argrest, "C") == 0)
2067 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2068 return EXIT_FAILURE;
2071 if (msg_action_arg >= 0)
2073 fprintf(stderr, "exim: incompatible arguments\n");
2074 return EXIT_FAILURE;
2077 continue_transport = argv[++i];
2078 continue_hostname = argv[++i];
2079 continue_host_address = argv[++i];
2080 continue_sequence = Uatoi(argv[++i]);
2081 msg_action = MSG_DELIVER;
2082 msg_action_arg = ++i;
2083 forced_delivery = TRUE;
2084 queue_run_pid = passed_qr_pid;
2085 queue_run_pipe = passed_qr_pipe;
2087 if (!mac_ismsgid(argv[i]))
2089 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2091 return EXIT_FAILURE;
2094 if (running_in_test_harness) millisleep(500);
2098 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2099 precedes -MC (see above). The flag indicates that the host to which
2100 Exim is connected has accepted an AUTH sequence. */
2102 else if (Ustrcmp(argrest, "CA") == 0)
2104 smtp_authenticated = TRUE;
2108 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2109 it preceded -MC (see above) */
2111 else if (Ustrcmp(argrest, "CP") == 0)
2113 smtp_use_pipelining = TRUE;
2117 /* -MCQ: pass on the pid of the queue-running process that started
2118 this chain of deliveries and the fd of its synchronizing pipe; this
2119 is useful only when it precedes -MC (see above) */
2121 else if (Ustrcmp(argrest, "CQ") == 0)
2123 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2125 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2130 /* -MCS: set the smtp_use_size flag; this is useful only when it
2131 precedes -MC (see above) */
2133 else if (Ustrcmp(argrest, "CS") == 0)
2135 smtp_use_size = TRUE;
2139 /* -MCT: set the tls_offered flag; this is useful only when it
2140 precedes -MC (see above). The flag indicates that the host to which
2141 Exim is connected has offered TLS support. */
2144 else if (Ustrcmp(argrest, "CT") == 0)
2151 /* -M[x]: various operations on the following list of message ids:
2152 -M deliver the messages, ignoring next retry times and thawing
2153 -Mc deliver the messages, checking next retry times, no thawing
2154 -Mf freeze the messages
2155 -Mg give up on the messages
2156 -Mt thaw the messages
2157 -Mrm remove the messages
2158 In the above cases, this must be the last option. There are also the
2159 following options which are followed by a single message id, and which
2160 act on that message. Some of them use the "recipient" addresses as well.
2161 -Mar add recipient(s)
2162 -Mmad mark all recipients delivered
2163 -Mmd mark recipients(s) delivered
2170 else if (*argrest == 0)
2172 msg_action = MSG_DELIVER;
2173 forced_delivery = deliver_force_thaw = TRUE;
2175 else if (Ustrcmp(argrest, "ar") == 0)
2177 msg_action = MSG_ADD_RECIPIENT;
2178 one_msg_action = TRUE;
2180 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2181 else if (Ustrcmp(argrest, "es") == 0)
2183 msg_action = MSG_EDIT_SENDER;
2184 one_msg_action = TRUE;
2186 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2187 else if (Ustrcmp(argrest, "g") == 0)
2189 msg_action = MSG_DELIVER;
2190 deliver_give_up = TRUE;
2192 else if (Ustrcmp(argrest, "mad") == 0)
2194 msg_action = MSG_MARK_ALL_DELIVERED;
2196 else if (Ustrcmp(argrest, "md") == 0)
2198 msg_action = MSG_MARK_DELIVERED;
2199 one_msg_action = TRUE;
2201 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2202 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2203 else if (Ustrcmp(argrest, "vb") == 0)
2205 msg_action = MSG_SHOW_BODY;
2206 one_msg_action = TRUE;
2208 else if (Ustrcmp(argrest, "vh") == 0)
2210 msg_action = MSG_SHOW_HEADER;
2211 one_msg_action = TRUE;
2213 else if (Ustrcmp(argrest, "vl") == 0)
2215 msg_action = MSG_SHOW_LOG;
2216 one_msg_action = TRUE;
2218 else { badarg = TRUE; break; }
2220 /* All the -Mxx options require at least one message id. */
2222 msg_action_arg = i + 1;
2223 if (msg_action_arg >= argc)
2225 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2226 return EXIT_FAILURE;
2229 /* Some require only message ids to follow */
2231 if (!one_msg_action)
2234 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2236 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2238 return EXIT_FAILURE;
2240 goto END_ARG; /* Remaining args are ids */
2243 /* Others require only one message id, possibly followed by addresses,
2244 which will be handled as normal arguments. */
2248 if (!mac_ismsgid(argv[msg_action_arg]))
2250 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2251 argv[msg_action_arg], arg);
2252 return EXIT_FAILURE;
2259 /* Some programs seem to call the -om option without the leading o;
2260 for sendmail it askes for "me too". Exim always does this. */
2263 if (*argrest != 0) badarg = TRUE;
2267 /* -N: don't do delivery - a debugging option that stops transports doing
2268 their thing. It implies debugging at the D_v level. */
2273 dont_deliver = TRUE;
2274 debug_selector |= D_v;
2275 debug_file = stderr;
2281 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2287 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2288 option to the specified value. This form uses long names. We need to handle
2289 -O option=value and -Ooption=value. */
2296 fprintf(stderr, "exim: string expected after -O\n");
2304 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2307 if (*argrest == 'A')
2309 alias_arg = argrest + 1;
2310 if (alias_arg[0] == 0)
2312 if (i+1 < argc) alias_arg = argv[++i]; else
2314 fprintf(stderr, "exim: string expected after -oA\n");
2320 /* -oB: Set a connection message max value for remote deliveries */
2322 else if (*argrest == 'B')
2324 uschar *p = argrest + 1;
2327 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2329 connection_max_messages = 1;
2338 fprintf(stderr, "exim: number expected after -oB\n");
2341 connection_max_messages = Uatoi(p);
2345 /* -odb: background delivery */
2347 else if (Ustrcmp(argrest, "db") == 0)
2349 synchronous_delivery = FALSE;
2350 arg_queue_only = FALSE;
2351 queue_only_set = TRUE;
2354 /* -odf: foreground delivery (smail-compatible option); same effect as
2355 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2358 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2360 synchronous_delivery = TRUE;
2361 arg_queue_only = FALSE;
2362 queue_only_set = TRUE;
2365 /* -odq: queue only */
2367 else if (Ustrcmp(argrest, "dq") == 0)
2369 synchronous_delivery = FALSE;
2370 arg_queue_only = TRUE;
2371 queue_only_set = TRUE;
2374 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2375 but no remote delivery */
2377 else if (Ustrcmp(argrest, "dqs") == 0)
2380 arg_queue_only = FALSE;
2381 queue_only_set = TRUE;
2384 /* -oex: Sendmail error flags. As these are also accepted without the
2385 leading -o prefix, for compatibility with vacation and other callers,
2386 they are handled with -e above. */
2388 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2389 -oitrue: Another sendmail syntax for the same */
2391 else if (Ustrcmp(argrest, "i") == 0 ||
2392 Ustrcmp(argrest, "itrue") == 0)
2395 /* -oM*: Set various characteristics for an incoming message; actually
2396 acted on for trusted callers only. */
2398 else if (*argrest == 'M')
2402 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2406 /* -oMa: Set sender host address */
2408 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2410 /* -oMaa: Set authenticator name */
2412 else if (Ustrcmp(argrest, "Maa") == 0)
2413 sender_host_authenticated = argv[++i];
2415 /* -oMas: setting authenticated sender */
2417 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2419 /* -oMai: setting authenticated id */
2421 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2423 /* -oMi: Set incoming interface address */
2425 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2427 /* -oMr: Received protocol */
2429 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2431 /* -oMs: Set sender host name */
2433 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2435 /* -oMt: Set sender ident */
2437 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2439 /* Else a bad argument */
2448 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2449 seem to call this as -m (undocumented), so that is also accepted (see
2452 else if (Ustrcmp(argrest, "m") == 0) {}
2454 /* -oo: An ancient flag for old-style addresses which still seems to
2455 crop up in some calls (see in SCO). */
2457 else if (Ustrcmp(argrest, "o") == 0) {}
2459 /* -oP <name>: set pid file path for daemon */
2461 else if (Ustrcmp(argrest, "P") == 0)
2462 override_pid_file_path = argv[++i];
2464 /* -or <n>: set timeout for non-SMTP acceptance
2465 -os <n>: set timeout for SMTP acceptance */
2467 else if (*argrest == 'r' || *argrest == 's')
2469 int *tp = (*argrest == 'r')?
2470 &arg_receive_timeout : &arg_smtp_receive_timeout;
2471 if (argrest[1] == 0)
2473 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2475 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2478 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2483 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2485 else if (Ustrcmp(argrest, "X") == 0)
2486 override_local_interfaces = argv[++i];
2488 /* Unknown -o argument */
2494 /* -ps: force Perl startup; -pd force delayed Perl startup */
2498 if (*argrest == 's' && argrest[1] == 0)
2500 perl_start_option = 1;
2503 if (*argrest == 'd' && argrest[1] == 0)
2505 perl_start_option = -1;
2510 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2511 which sets the host protocol and host name */
2515 if (i+1 < argc) argrest = argv[++i]; else
2516 { badarg = TRUE; break; }
2521 uschar *hn = Ustrchr(argrest, ':');
2524 received_protocol = argrest;
2528 received_protocol = string_copyn(argrest, hn - argrest);
2529 sender_host_name = hn + 1;
2536 receiving_message = FALSE;
2538 /* -qq...: Do queue runs in a 2-stage manner */
2540 if (*argrest == 'q')
2542 queue_2stage = TRUE;
2546 /* -qi...: Do only first (initial) deliveries */
2548 if (*argrest == 'i')
2550 queue_run_first_delivery = TRUE;
2554 /* -qf...: Run the queue, forcing deliveries
2555 -qff..: Ditto, forcing thawing as well */
2557 if (*argrest == 'f')
2559 queue_run_force = TRUE;
2560 if (*(++argrest) == 'f')
2562 deliver_force_thaw = TRUE;
2567 /* -q[f][f]l...: Run the queue only on local deliveries */
2569 if (*argrest == 'l')
2571 queue_run_local = TRUE;
2575 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2576 optionally starting from a given message id. */
2578 if (*argrest == 0 &&
2579 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2582 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2583 start_queue_run_id = argv[++i];
2584 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2585 stop_queue_run_id = argv[++i];
2588 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2589 optionally local only. */
2594 queue_interval = readconf_readtime(argrest, 0, FALSE);
2596 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2597 if (queue_interval <= 0)
2599 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2606 case 'R': /* Synonymous with -qR... */
2607 receiving_message = FALSE;
2609 /* -Rf: As -R (below) but force all deliveries,
2610 -Rff: Ditto, but also thaw all frozen messages,
2611 -Rr: String is regex
2612 -Rrf: Regex and force
2613 -Rrff: Regex and force and thaw
2615 in all cases provided there are no further characters in this
2621 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2623 if (Ustrcmp(argrest, rsopts[i]) == 0)
2625 if (i != 2) queue_run_force = TRUE;
2626 if (i >= 2) deliver_selectstring_regex = TRUE;
2627 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2628 argrest += Ustrlen(rsopts[i]);
2633 /* -R: Set string to match in addresses for forced queue run to
2634 pick out particular messages. */
2638 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2640 fprintf(stderr, "exim: string expected after -R\n");
2644 else deliver_selectstring = argrest;
2645 if (queue_interval < 0) queue_interval = 0;
2649 /* -r: an obsolete synonym for -f (see above) */
2652 /* -S: Like -R but works on sender. */
2654 case 'S': /* Synonymous with -qS... */
2655 receiving_message = FALSE;
2657 /* -Sf: As -S (below) but force all deliveries,
2658 -Sff: Ditto, but also thaw all frozen messages,
2659 -Sr: String is regex
2660 -Srf: Regex and force
2661 -Srff: Regex and force and thaw
2663 in all cases provided there are no further characters in this
2669 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2671 if (Ustrcmp(argrest, rsopts[i]) == 0)
2673 if (i != 2) queue_run_force = TRUE;
2674 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2675 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2676 argrest += Ustrlen(rsopts[i]);
2681 /* -S: Set string to match in addresses for forced queue run to
2682 pick out particular messages. */
2686 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2688 fprintf(stderr, "exim: string expected after -S\n");
2692 else deliver_selectstring_sender = argrest;
2693 if (queue_interval < 0) queue_interval = 0;
2696 /* -Tqt is an option that is exclusively for use by the testing suite.
2697 It is not recognized in other circumstances. It allows for the setting up
2698 of explicit "queue times" so that various warning/retry things can be
2699 tested. Otherwise variability of clock ticks etc. cause problems. */
2702 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2703 fudged_queue_times = argv[++i];
2708 /* -t: Set flag to extract recipients from body of message. */
2711 if (*argrest == 0) extract_recipients = TRUE;
2713 /* -ti: Set flag to extract recipients from body of message, and also
2714 specify that dot does not end the message. */
2716 else if (Ustrcmp(argrest, "i") == 0)
2718 extract_recipients = TRUE;
2722 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2725 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2732 /* -U: This means "initial user submission" in sendmail, apparently. The
2733 doc claims that in future sendmail may refuse syntactically invalid
2734 messages instead of fixing them. For the moment, we just ignore it. */
2740 /* -v: verify things - this is a very low-level debugging */
2745 debug_selector |= D_v;
2746 debug_file = stderr;
2752 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2754 The -x flag tells the sendmail command that mail from a local
2755 mail program has National Language Support (NLS) extended characters
2756 in the body of the mail item. The sendmail command can send mail with
2757 extended NLS characters across networks that normally corrupts these
2760 As Exim is 8-bit clean, it just ignores this flag. */
2763 if (*argrest != 0) badarg = TRUE;
2766 /* All other initial characters are errors */
2771 } /* End of high-level switch statement */
2773 /* Failed to recognize the option, or syntax error */
2777 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2778 "option %s\n", arg);
2784 /* Arguments have been processed. Check for incompatibilities. */
2788 (smtp_input || extract_recipients || recipients_arg < argc) &&
2789 (daemon_listen || queue_interval >= 0 || bi_option ||
2790 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2791 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2794 msg_action_arg > 0 &&
2795 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2796 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2799 (daemon_listen || queue_interval >= 0) &&
2800 (sender_address != NULL || list_options || list_queue || checking ||
2804 daemon_listen && queue_interval == 0
2808 (checking || smtp_input || extract_recipients ||
2809 filter_test != FTEST_NONE || bi_option)
2812 verify_address_mode &&
2813 (address_test_mode || smtp_input || extract_recipients ||
2814 filter_test != FTEST_NONE || bi_option)
2817 address_test_mode && (smtp_input || extract_recipients ||
2818 filter_test != FTEST_NONE || bi_option)
2821 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2825 deliver_selectstring != NULL && queue_interval < 0
2829 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2833 /* If debugging is set up, set the file and the file descriptor to pass on to
2834 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2835 to run in the foreground. */
2837 if (debug_selector != 0)
2839 debug_file = stderr;
2840 debug_fd = fileno(debug_file);
2841 background_daemon = FALSE;
2842 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2843 if (debug_selector != D_v) /* -v only doesn't show this */
2845 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2846 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2848 show_whats_supported(stderr);
2852 /* When started with root privilege, ensure that the limits on the number of
2853 open files and the number of processes (where that is accessible) are
2854 sufficiently large, or are unset, in case Exim has been called from an
2855 environment where the limits are screwed down. Not all OS have the ability to
2856 change some of these limits. */
2860 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2866 #ifdef RLIMIT_NOFILE
2867 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2869 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2871 rlp.rlim_cur = rlp.rlim_max = 0;
2874 /* I originally chose 1000 as a nice big number that was unlikely to
2875 be exceeded. It turns out that some older OS have a fixed upper limit of
2878 if (rlp.rlim_cur < 1000)
2880 rlp.rlim_cur = rlp.rlim_max = 1000;
2881 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2883 rlp.rlim_cur = rlp.rlim_max = 256;
2884 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2885 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2892 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2894 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2896 rlp.rlim_cur = rlp.rlim_max = 0;
2899 #ifdef RLIM_INFINITY
2900 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2902 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2904 if (rlp.rlim_cur < 1000)
2906 rlp.rlim_cur = rlp.rlim_max = 1000;
2908 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2909 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2915 /* Exim is normally entered as root (but some special configurations are
2916 possible that don't do this). However, it always spins off sub-processes that
2917 set their uid and gid as required for local delivery. We don't want to pass on
2918 any extra groups that root may belong to, so we want to get rid of them all at
2921 We need to obey setgroups() at this stage, before possibly giving up root
2922 privilege for a changed configuration file, but later on we might need to
2923 check on the additional groups for the admin user privilege - can't do that
2924 till after reading the config, which might specify the exim gid. Therefore,
2925 save the group list here first. */
2927 group_count = getgroups(NGROUPS_MAX, group_list);
2929 /* There is a fundamental difference in some BSD systems in the matter of
2930 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2931 known not to be different. On the "different" systems there is a single group
2932 list, and the first entry in it is the current group. On all other versions of
2933 Unix there is a supplementary group list, which is in *addition* to the current
2934 group. Consequently, to get rid of all extraneous groups on a "standard" system
2935 you pass over 0 groups to setgroups(), while on a "different" system you pass
2936 over a single group - the current group, which is always the first group in the
2937 list. Calling setgroups() with zero groups on a "different" system results in
2938 an error return. The following code should cope with both types of system.
2940 However, if this process isn't running as root, setgroups() can't be used
2941 since you have to be root to run it, even if throwing away groups. Not being
2942 root here happens only in some unusual configurations. We just ignore the
2945 if (setgroups(0, NULL) != 0)
2947 if (setgroups(1, group_list) != 0 && !unprivileged)
2949 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2954 /* If the configuration file name has been altered by an argument on the
2955 command line (either a new file name or a macro definition) and the caller is
2956 not root or the exim user, or if this is a filter testing run, remove any
2957 setuid privilege the program has, and run as the underlying user.
2959 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2960 severely restricts the use of -C for some purposes.
2962 Otherwise, set the real ids to the effective values (should be root unless run
2963 from inetd, which it can either be root or the exim uid, if one is configured).
2965 There is a private mechanism for bypassing some of this, in order to make it
2966 possible to test lots of configurations automatically, without having either to
2967 recompile each time, or to patch in an actual configuration file name and other
2968 values (such as the path name). If running in the test harness, pretend that
2969 configuration file changes and macro definitions haven't happened. */
2972 (config_changed || macros != NULL) && /* Config changed, and */
2973 real_uid != root_uid && /* Not root, and */
2974 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2975 real_uid != exim_uid && /* Not exim, and */
2977 !running_in_test_harness /* Not fudged */
2979 expansion_test /* expansion testing */
2981 filter_test != FTEST_NONE) /* Filter testing */
2983 setgroups(group_count, group_list);
2984 exim_setugid(real_uid, real_gid, FALSE,
2985 US"-C, -D, -be or -bf forces real uid");
2986 removed_privilege = TRUE;
2988 /* In the normal case when Exim is called like this, stderr is available
2989 and should be used for any logging information because attempts to write
2990 to the log will usually fail. To arrange this, we unset really_exim. However,
2991 if no stderr is available there is no point - we might as well have a go
2992 at the log (if it fails, syslog will be written). */
2994 if (log_stderr != NULL) really_exim = FALSE;
2997 /* Privilege is to be retained for the moment. It may be dropped later,
2998 depending on the job that this Exim process has been asked to do. For now, set
2999 the real uid to the effective so that subsequent re-execs of Exim are done by a
3002 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3004 /* If testing a filter, open the file(s) now, before wasting time doing other
3005 setups and reading the message. */
3007 if ((filter_test & FTEST_SYSTEM) != 0)
3009 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3012 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3014 return EXIT_FAILURE;
3018 if ((filter_test & FTEST_USER) != 0)
3020 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3023 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3025 return EXIT_FAILURE;
3029 /* Read the main runtime configuration data; this gives up if there
3030 is a failure. It leaves the configuration file open so that the subsequent
3031 configuration data for delivery can be read if needed. */
3035 /* Handle the decoding of logging options. */
3037 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3038 log_options, log_options_count, US"log");
3042 debug_printf("configuration file is %s\n", config_main_filename);
3043 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3044 log_extra_selector);
3047 /* If domain literals are not allowed, check the sender address that was
3048 supplied with -f. Ditto for a stripped trailing dot. */
3050 if (sender_address != NULL)
3052 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3054 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3055 "allowed\n", sender_address);
3056 return EXIT_FAILURE;
3058 if (f_end_dot && !strip_trailing_dot)
3060 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3061 "(trailing dot not allowed)\n", sender_address);
3062 return EXIT_FAILURE;
3066 /* Paranoia check of maximum lengths of certain strings. There is a check
3067 on the length of the log file path in log.c, which will come into effect
3068 if there are any calls to write the log earlier than this. However, if we
3069 get this far but the string is very long, it is better to stop now than to
3070 carry on and (e.g.) receive a message and then have to collapse. The call to
3071 log_write() from here will cause the ultimate panic collapse if the complete
3072 file name exceeds the buffer length. */
3074 if (Ustrlen(log_file_path) > 200)
3075 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3076 "log_file_path is longer than 200 chars: aborting");
3078 if (Ustrlen(pid_file_path) > 200)
3079 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3080 "pid_file_path is longer than 200 chars: aborting");
3082 if (Ustrlen(spool_directory) > 200)
3083 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3084 "spool_directory is longer than 200 chars: aborting");
3086 /* Length check on the process name given to syslog for its TAG field,
3087 which is only permitted to be 32 characters or less. See RFC 3164. */
3089 if (Ustrlen(syslog_processname) > 32)
3090 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3091 "syslog_processname is longer than 32 chars: aborting");
3093 /* In some operating systems, the environment variable TMPDIR controls where
3094 temporary files are created; Exim doesn't use these (apart from when delivering
3095 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3096 If TMPDIR is found in the environment, reset it to the value defined in the
3097 TMPDIR macro, if this macro is defined. */
3102 for (p = USS environ; *p != NULL; p++)
3104 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3105 Ustrcmp(*p+7, TMPDIR) != 0)
3107 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3108 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3110 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3116 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3117 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3118 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3119 called by a user who has set the TZ variable. This then affects the timestamps
3120 in log files and in Received: headers, and any created Date: header lines. The
3121 required timezone is settable in the configuration file, so nothing can be done
3122 about this earlier - but hopefully nothing will normally be logged earlier than
3123 this. We have to make a new environment if TZ is wrong, but don't bother if
3124 timestamps_utc is set, because then all times are in UTC anyway. */
3126 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3128 timestamps_utc = TRUE;
3132 uschar *envtz = US getenv("TZ");
3133 if ((envtz == NULL && timezone_string != NULL) ||
3135 (timezone_string == NULL ||
3136 Ustrcmp(timezone_string, envtz) != 0)))
3138 uschar **p = USS environ;
3142 while (*p++ != NULL) count++;
3143 if (envtz == NULL) count++;
3144 newp = new = malloc(sizeof(uschar *) * (count + 1));
3145 for (p = USS environ; *p != NULL; p++)
3147 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3150 if (timezone_string != NULL)
3152 *newp = malloc(Ustrlen(timezone_string) + 4);
3153 sprintf(CS *newp++, "TZ=%s", timezone_string);
3158 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3159 tod_stamp(tod_log));
3163 /* Handle the case when we have removed the setuid privilege because of -C or
3164 -D. This means that the caller of Exim was not root, and, provided that
3165 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3168 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3169 were running as the exim user defined in the configuration file (different to
3170 the one in the binary). The sysadmin may expect this case to retain privilege
3171 because "the binary was called by the Exim user", but it hasn't, because of the
3172 order in which it handles this stuff. There are two possibilities:
3174 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3175 to do message deliveries. Thus, the fact that it is running as a
3176 non-privileged user is plausible, and might be wanted in some special
3177 configurations. However, really_exim will have been set false when
3178 privilege was dropped, to stop Exim trying to write to its normal log
3179 files. Therefore, re-enable normal log processing, assuming the sysadmin
3180 has set up the log directory correctly.
3182 (2) If deliver_drop_privilege is not set, the configuration won't work as
3183 apparently intended, and so we log a panic message. In order to retain
3184 root for -C or -D, the caller must either be root or the Exim user
3185 defined in the binary (when deliver_drop_ privilege is false).
3187 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3188 built-in exim user or one defined in the configuration. In either event,
3189 re-enable log processing, assuming the sysadmin knows what they are doing. */
3191 if (removed_privilege && (config_changed || macros != NULL) &&
3192 real_uid == exim_uid)
3194 #ifdef ALT_CONFIG_ROOT_ONLY
3195 really_exim = TRUE; /* let logging work normally */
3198 if (deliver_drop_privilege)
3199 really_exim = TRUE; /* let logging work normally */
3201 log_write(0, LOG_MAIN|LOG_PANIC,
3202 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3203 (int)exim_uid, config_changed? "-C" : "-D");
3207 /* Start up Perl interpreter if Perl support is configured and there is a
3208 perl_startup option, and the configuration or the command line specifies
3209 initializing starting. Note that the global variables are actually called
3210 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3213 if (perl_start_option != 0)
3214 opt_perl_at_start = (perl_start_option > 0);
3215 if (opt_perl_at_start && opt_perl_startup != NULL)
3218 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3219 errstr = init_perl(opt_perl_startup);
3222 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3223 return EXIT_FAILURE;
3225 opt_perl_started = TRUE;
3227 #endif /* EXIM_PERL */
3229 /* Log the arguments of the call if the configuration file said so. This is
3230 a debugging feature for finding out what arguments certain MUAs actually use.
3231 Don't attempt it if logging is disabled, or if listing variables or if
3232 verifying/testing addresses or expansions. */
3234 if ((log_extra_selector & LX_arguments) != 0 && really_exim
3235 && !list_options && !checking)
3238 uschar *p = big_buffer;
3240 (void)getcwd(CS p+4, big_buffer_size - 4);
3242 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3244 for (i = 0; i < argc; i++)
3246 int len = Ustrlen(argv[i]);
3249 if (p + len + 8 >= big_buffer + big_buffer_size)
3252 log_write(0, LOG_MAIN, "%s", big_buffer);
3253 Ustrcpy(big_buffer, "...");
3256 printing = string_printing(argv[i]);
3257 if (printing[0] == 0) quote = US"\""; else
3259 uschar *pp = printing;
3261 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3263 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3264 (p - big_buffer) - 4), printing, quote);
3267 log_write(0, LOG_MAIN, "%s", big_buffer);
3270 /* Set the working directory to be the top-level spool directory. We don't rely
3271 on this in the code, which always uses fully qualified names, but it's useful
3272 for core dumps etc. Don't complain if it fails - the spool directory might not
3273 be generally accessible and calls with the -C option (and others) have lost
3274 privilege by now. */
3276 if (Uchdir(spool_directory) != 0)
3278 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3279 (void)Uchdir(spool_directory);
3282 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3283 alias file. Exim doesn't have such a concept, but this call is screwed into
3284 Sun's YP makefiles. Handle this by calling a configured script, as the real
3285 user who called Exim. The -oA option can be used to pass an argument to the
3290 fclose(config_file);
3291 if (bi_command != NULL)
3295 argv[i++] = bi_command;
3296 if (alias_arg != NULL) argv[i++] = alias_arg;
3299 setgroups(group_count, group_list);
3300 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3302 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3303 (argv[1] == NULL)? US"" : argv[1]);
3305 execv(CS argv[0], (char *const *)argv);
3306 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3311 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3316 /* If an action on specific messages is requested, or if a daemon or queue
3317 runner is being started, we need to know if Exim was called by an admin user.
3318 This is the case if the real user is root or exim, or if the real group is
3319 exim, or if one of the supplementary groups is exim or a group listed in
3320 admin_groups. We don't fail all message actions immediately if not admin_user,
3321 since some actions can be performed by non-admin users. Instead, set admin_user
3322 for later interrogation. */
3324 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3330 for (i = 0; i < group_count; i++)
3332 if (group_list[i] == exim_gid) admin_user = TRUE;
3333 else if (admin_groups != NULL)
3335 for (j = 1; j <= (int)(admin_groups[0]); j++)
3336 if (admin_groups[j] == group_list[i])
3337 { admin_user = TRUE; break; }
3339 if (admin_user) break;
3343 /* Another group of privileged users are the trusted users. These are root,
3344 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3345 are permitted to specify sender_addresses with -f on the command line, and
3346 other message parameters as well. */
3348 if (real_uid == root_uid || real_uid == exim_uid)
3349 trusted_caller = TRUE;
3354 if (trusted_users != NULL)
3356 for (i = 1; i <= (int)(trusted_users[0]); i++)
3357 if (trusted_users[i] == real_uid)
3358 { trusted_caller = TRUE; break; }
3361 if (!trusted_caller && trusted_groups != NULL)
3363 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3365 if (trusted_groups[i] == real_gid)
3366 trusted_caller = TRUE;
3367 else for (j = 0; j < group_count; j++)
3369 if (trusted_groups[i] == group_list[j])
3370 { trusted_caller = TRUE; break; }
3372 if (trusted_caller) break;
3377 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3378 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3380 /* Only an admin user may start the daemon or force a queue run in the default
3381 configuration, but the queue run restriction can be relaxed. Only an admin
3382 user may request that a message be returned to its sender forthwith. Only an
3383 admin user may specify a debug level greater than D_v (because it might show
3384 passwords, etc. in lookup queries). Only an admin user may request a queue
3389 BOOL debugset = (debug_selector & ~D_v) != 0;
3390 if (deliver_give_up || daemon_listen ||
3391 (count_queue && queue_list_requires_admin) ||
3392 (list_queue && queue_list_requires_admin) ||
3393 (queue_interval >= 0 && prod_requires_admin) ||
3394 (debugset && !running_in_test_harness))
3396 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3401 /* If the real user is not root or the exim uid, the argument for passing
3402 in an open TCP/IP connection for another message is not permitted, nor is
3403 running with the -N option for any delivery action, unless this call to exim is
3404 one that supplied an input message, or we are using a patched exim for
3405 regression testing. */
3407 if (real_uid != root_uid && real_uid != exim_uid &&
3408 (continue_hostname != NULL ||
3410 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3411 )) && !running_in_test_harness)
3413 fprintf(stderr, "exim: Permission denied\n");
3414 return EXIT_FAILURE;
3417 /* If the caller is not trusted, certain arguments are ignored when running for
3418 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3419 Note that authority for performing certain actions on messages is tested in the
3420 queue_action() function. */
3422 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3424 sender_host_name = sender_host_address = interface_address =
3425 sender_ident = received_protocol = NULL;
3426 sender_host_port = interface_port = 0;
3427 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3430 /* If a sender host address is set, extract the optional port number off the
3431 end of it and check its syntax. Do the same thing for the interface address.
3432 Exim exits if the syntax is bad. */
3436 if (sender_host_address != NULL)
3437 sender_host_port = check_port(sender_host_address);
3438 if (interface_address != NULL)
3439 interface_port = check_port(interface_address);
3442 /* If an SMTP message is being received check to see if the standard input is a
3443 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3444 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3449 union sockaddr_46 inetd_sock;
3450 SOCKLEN_T size = sizeof(inetd_sock);
3451 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3453 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3454 if (family == AF_INET || family == AF_INET6)
3456 union sockaddr_46 interface_sock;
3457 size = sizeof(interface_sock);
3459 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3460 interface_address = host_ntoa(-1, &interface_sock, NULL,
3463 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3465 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3468 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3469 NULL, &sender_host_port);
3470 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3471 "inetd is not supported when mua_wrapper is set");
3476 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3477 return EXIT_FAILURE;
3483 /* If the load average is going to be needed while receiving a message, get it
3484 now for those OS that require the first call to os_getloadavg() to be done as
3485 root. There will be further calls later for each message received. */
3487 #ifdef LOAD_AVG_NEEDS_ROOT
3488 if (receiving_message &&
3489 (queue_only_load >= 0 ||
3490 (is_inetd && smtp_load_reserve >= 0)
3493 load_average = os_getloadavg();
3497 /* The queue_only configuration option can be overridden by -odx on the command
3498 line, except that if queue_only_override is false, queue_only cannot be unset
3499 from the command line. */
3501 if (queue_only_set && (queue_only_override || arg_queue_only))
3502 queue_only = arg_queue_only;
3504 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3507 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3508 if (arg_smtp_receive_timeout >= 0)
3509 smtp_receive_timeout = arg_smtp_receive_timeout;
3511 /* If Exim was started with root privilege, unless we have already removed the
3512 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3513 except when starting the daemon or doing some kind of delivery or address
3514 testing (-bt). These are the only cases when root need to be retained. We run
3515 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3516 retained only for starting the daemon. */
3518 if (!unprivileged && /* originally had root AND */
3519 !removed_privilege && /* still got root AND */
3520 !daemon_listen && /* not starting the daemon */
3521 queue_interval <= 0 && /* (either kind of daemon) */
3523 deliver_drop_privilege || /* requested unprivileged */
3525 queue_interval < 0 && /* not running the queue */
3526 (msg_action_arg < 0 || /* and */
3527 msg_action != MSG_DELIVER) && /* not delivering and */
3528 (!checking || !address_test_mode) /* not address checking */
3532 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3535 /* When we are retaining a privileged uid, we still change to the exim gid. */
3537 else setgid(exim_gid);
3539 /* Handle a request to list the delivery queue */
3543 set_process_info("listing the queue");
3544 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3548 /* Handle a request to count the delivery queue */
3552 set_process_info("counting the queue");
3557 /* Handle actions on specific messages, except for the force delivery action,
3558 which is done below. Some actions take a whole list of message ids, which
3559 are known to continue up to the end of the arguments. Others take a single
3560 message id and then operate on the recipients list. */
3562 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3564 int yield = EXIT_SUCCESS;
3565 set_process_info("acting on specified messages");
3567 if (!one_msg_action)
3569 for (i = msg_action_arg; i < argc; i++)
3570 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3571 yield = EXIT_FAILURE;
3574 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3575 recipients_arg)) yield = EXIT_FAILURE;
3579 /* All the modes below here require the remaining configuration sections
3580 to be read, except that we can skip over the ACL setting when delivering
3581 specific messages, or doing a queue run. (For various testing cases we could
3582 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3585 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3587 /* The configuration data will have been read into POOL_PERM because we won't
3588 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3589 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3590 configuration were read into POOL_MAIN, because we don't do any resets till
3591 later on. However, it seems right, and it does ensure that both pools get used.
3594 store_pool = POOL_MAIN;
3596 /* Handle the -brt option. This is for checking out retry configurations.
3597 The next three arguments are a domain name or a complete address, and
3598 optionally two error numbers. All it does is to call the function that
3599 scans the retry configuration data. */
3601 if (test_retry_arg >= 0)
3603 retry_config *yield;
3604 int basic_errno = 0;
3608 if (test_retry_arg >= argc)
3610 printf("-brt needs a domain or address argument\n");
3611 exim_exit(EXIT_FAILURE);
3613 s1 = argv[test_retry_arg++];
3616 /* If the first argument contains no @ and no . it might be a local user
3617 or it might be a single-component name. Treat as a domain. */
3619 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3621 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3622 "being \ntreated as a one-component domain, not as a local part.\n\n",
3626 /* There may be an optional second domain arg. */
3628 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3629 s2 = argv[test_retry_arg++];
3631 /* The final arg is an error name */
3633 if (test_retry_arg < argc)
3635 uschar *ss = argv[test_retry_arg];
3637 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3640 printf("%s\n", CS error);
3641 return EXIT_FAILURE;
3644 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3645 an error is for matching codes to the decade. Turn them into a real error
3646 code, off the decade. */
3648 if (basic_errno == ERRNO_RCPT4XX)
3650 int code = (more_errno >> 8) & 255;
3652 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3653 else if (code > 100)
3654 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3658 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3659 if (yield == NULL) printf("No retry information found\n"); else
3662 more_errno = yield->more_errno;
3663 printf("Retry rule: %s ", yield->pattern);
3665 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3667 printf("quota%s%s ",
3668 (more_errno > 0)? "_" : "",
3669 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3671 else if (yield->basic_errno == ECONNREFUSED)
3673 printf("refused%s%s ",
3674 (more_errno > 0)? "_" : "",
3675 (more_errno == 'M')? "MX" :
3676 (more_errno == 'A')? "A" : "");
3678 else if (yield->basic_errno == ETIMEDOUT)
3681 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3683 if (more_errno != 0) printf("_%s",
3684 (more_errno == 'M')? "MX" : "A");
3687 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3688 printf("auth_failed ");
3691 for (r = yield->rules; r != NULL; r = r->next)
3693 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3694 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3700 printf(",%d.", x/1000);
3714 exim_exit(EXIT_SUCCESS);
3717 /* Handle a request to list one or more configuration options */
3721 set_process_info("listing variables");
3722 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3723 else for (i = recipients_arg; i < argc; i++)
3726 (Ustrcmp(argv[i], "router") == 0 ||
3727 Ustrcmp(argv[i], "transport") == 0 ||
3728 Ustrcmp(argv[i], "authenticator") == 0))
3730 readconf_print(argv[i+1], argv[i]);
3733 else readconf_print(argv[i], NULL);
3735 exim_exit(EXIT_SUCCESS);
3739 /* Handle a request to deliver one or more messages that are already on the
3740 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3741 is typically used for a small number when prodding by hand (when the option
3742 forced_delivery will be set) or when re-execing to regain root privilege.
3743 Each message delivery must happen in a separate process, so we fork a process
3744 for each one, and run them sequentially so that debugging output doesn't get
3745 intertwined, and to avoid spawning too many processes if a long list is given.
3746 However, don't fork for the last one; this saves a process in the common case
3747 when Exim is called to deliver just one message. */
3749 if (msg_action_arg > 0)
3751 if (prod_requires_admin && !admin_user)
3753 fprintf(stderr, "exim: Permission denied\n");
3754 exim_exit(EXIT_FAILURE);
3756 set_process_info("delivering specified messages");
3757 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3758 for (i = msg_action_arg; i < argc; i++)
3763 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3764 else if ((pid = fork()) == 0)
3766 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3767 _exit(EXIT_SUCCESS);
3771 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3773 exim_exit(EXIT_FAILURE);
3777 exim_exit(EXIT_SUCCESS);
3781 /* If only a single queue run is requested, without SMTP listening, we can just
3782 turn into a queue runner, with an optional starting message id. */
3784 if (queue_interval == 0 && !daemon_listen)
3786 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3787 (start_queue_run_id == NULL)? US"" : US" starting at ",
3788 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3789 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3790 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3791 set_process_info("running the queue (single queue run)");
3792 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3793 exim_exit(EXIT_SUCCESS);
3797 /* Find the login name of the real user running this process. This is always
3798 needed when receiving a message, because it is written into the spool file. It
3799 may also be used to construct a from: or a sender: header, and in this case we
3800 need the user's full name as well, so save a copy of it, checked for RFC822
3801 syntax and munged if necessary, if it hasn't previously been set by the -F
3802 argument. We may try to get the passwd entry more than once, in case NIS or
3803 other delays are in evidence. Save the home directory for use in filter testing
3808 if ((pw = getpwuid(real_uid)) != NULL)
3810 originator_login = string_copy(US pw->pw_name);
3811 originator_home = string_copy(US pw->pw_dir);
3813 /* If user name has not been set by -F, set it from the passwd entry
3814 unless -f has been used to set the sender address by a trusted user. */
3816 if (originator_name == NULL)
3818 if (sender_address == NULL ||
3819 (!trusted_caller && filter_test == FTEST_NONE))
3821 uschar *name = US pw->pw_gecos;
3822 uschar *amp = Ustrchr(name, '&');
3825 /* Most Unix specify that a '&' character in the gecos field is
3826 replaced by a copy of the login name, and some even specify that
3827 the first character should be upper cased, so that's what we do. */
3832 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3833 amp - name, name, &loffset, originator_login, amp + 1);
3834 buffer[loffset] = toupper(buffer[loffset]);
3838 /* If a pattern for matching the gecos field was supplied, apply
3839 it and then expand the name string. */
3841 if (gecos_pattern != NULL && gecos_name != NULL)
3844 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3846 if (regex_match_and_setup(re, name, 0, -1))
3848 uschar *new_name = expand_string(gecos_name);
3850 if (new_name != NULL)
3852 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3853 "gecos field \"%s\"\n", new_name, name);
3856 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3857 "\"%s\": %s\n", gecos_name, expand_string_message);
3859 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3860 "gecos field \"%s\"\n", gecos_pattern, name);
3861 store_free((void *)re);
3863 originator_name = string_copy(name);
3866 /* A trusted caller has used -f but not -F */
3868 else originator_name = US"";
3871 /* Break the retry loop */
3876 if (++i > finduser_retries) break;
3880 /* If we cannot get a user login, log the incident and give up, unless the
3881 configuration specifies something to use. When running in the test harness,
3882 any setting of unknown_login overrides the actual login name. */
3884 if (originator_login == NULL || running_in_test_harness)
3886 if (unknown_login != NULL)
3888 originator_login = expand_string(unknown_login);
3889 if (originator_name == NULL && unknown_username != NULL)
3890 originator_name = expand_string(unknown_username);
3891 if (originator_name == NULL) originator_name = US"";
3893 if (originator_login == NULL)
3894 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3898 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3901 originator_name = string_copy(parse_fix_phrase(originator_name,
3902 Ustrlen(originator_name), big_buffer, big_buffer_size));
3904 /* If a message is created by this call of Exim, the uid/gid of its originator
3905 are those of the caller. These values are overridden if an existing message is
3906 read in from the spool. */
3908 originator_uid = real_uid;
3909 originator_gid = real_gid;
3911 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3912 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3914 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3915 returns. We leave this till here so that the originator_ fields are available
3916 for incoming messages via the daemon. */
3918 if (daemon_listen || queue_interval > 0)
3920 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3921 "run when mua_wrapper is set");
3925 /* If the sender ident has not been set (by a trusted caller) set it to
3926 the caller. This will get overwritten below for an inetd call. If a trusted
3927 caller has set it empty, unset it. */
3929 if (sender_ident == NULL) sender_ident = originator_login;
3930 else if (sender_ident[0] == 0) sender_ident = NULL;
3932 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3933 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3934 originator_* variables set. */
3936 if (test_rewrite_arg >= 0)
3938 really_exim = FALSE;
3939 if (test_rewrite_arg >= argc)
3941 printf("-brw needs an address argument\n");
3942 exim_exit(EXIT_FAILURE);
3944 rewrite_test(argv[test_rewrite_arg]);
3945 exim_exit(EXIT_SUCCESS);
3948 /* A locally-supplied message is considered to be coming from a local user
3949 unless a trusted caller supplies a sender address with -f, or is passing in the
3950 message via SMTP (inetd invocation or otherwise). */
3952 if ((sender_address == NULL && !smtp_input) ||
3953 (!trusted_caller && filter_test == FTEST_NONE))
3955 sender_local = TRUE;
3957 /* A trusted caller can supply authenticated_sender and authenticated_id
3958 via -oMas and -oMai and if so, they will already be set. */
3960 if (authenticated_sender == NULL)
3961 authenticated_sender = string_sprintf("%s@%s", originator_login,
3962 qualify_domain_sender);
3963 if (authenticated_id == NULL) authenticated_id = originator_login;
3966 /* Trusted callers are always permitted to specify the sender address.
3967 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3968 is specified is the empty address. However, if a trusted caller does not
3969 specify a sender address for SMTP input, we leave sender_address unset. This
3970 causes the MAIL commands to be honoured. */
3972 if ((!smtp_input && sender_address == NULL) ||
3973 !receive_check_set_sender(sender_address))
3975 /* Either the caller is not permitted to set a general sender, or this is
3976 non-SMTP input and the trusted caller has not set a sender. If there is no
3977 sender, or if a sender other than <> is set, override with the originator's
3978 login (which will get qualified below), except when checking things. */
3980 if (sender_address == NULL /* No sender_address set */
3982 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3983 !checking && /* Not running tests, AND */
3984 filter_test == FTEST_NONE)) /* Not testing a filter */
3986 sender_address = originator_login;
3987 sender_address_forced = FALSE;
3988 sender_address_domain = 0;
3992 /* Remember whether an untrusted caller set the sender address */
3994 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
3996 /* Ensure that the sender address is fully qualified unless it is the empty
3997 address, which indicates an error message, or doesn't exist (root caller, smtp
3998 interface, no -f argument). */
4000 if (sender_address != NULL && sender_address[0] != 0 &&
4001 sender_address_domain == 0)
4002 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4003 qualify_domain_sender);
4005 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4007 /* Handle a request to verify a list of addresses, or test them for delivery.
4008 This must follow the setting of the sender address, since routers can be
4009 predicated upon the sender. If no arguments are given, read addresses from
4010 stdin. Set debug_level to at least D_v to get full output for address testing.
4013 if (verify_address_mode || address_test_mode)
4016 int flags = vopt_qualify;
4018 if (verify_address_mode)
4020 if (!verify_as_sender) flags |= vopt_is_recipient;
4021 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4026 flags |= vopt_is_recipient;
4027 debug_selector |= D_v;
4028 debug_file = stderr;
4029 debug_fd = fileno(debug_file);
4030 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4033 if (recipients_arg < argc)
4035 while (recipients_arg < argc)
4037 uschar *s = argv[recipients_arg++];
4040 BOOL finished = FALSE;
4041 uschar *ss = parse_find_address_end(s, FALSE);
4042 if (*ss == ',') *ss = 0; else finished = TRUE;
4043 test_address(s, flags, &exit_value);
4046 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4053 uschar *s = get_stdinput(NULL, NULL);
4054 if (s == NULL) break;
4055 test_address(s, flags, &exit_value);
4059 exim_exit(exit_value);
4062 /* Handle expansion checking */
4066 if (recipients_arg < argc)
4068 while (recipients_arg < argc)
4070 uschar *s = argv[recipients_arg++];
4071 uschar *ss = expand_string(s);
4073 printf ("Failed: %s\n", expand_string_message);
4074 else printf("%s\n", CS ss);
4082 char *(*fn_readline)(char *) = NULL;
4083 char *(*fn_addhist)(char *) = NULL;
4086 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4092 uschar *source = get_stdinput(fn_readline, fn_addhist);
4093 if (source == NULL) break;
4094 ss = expand_string(source);
4096 printf ("Failed: %s\n", expand_string_message);
4097 else printf("%s\n", CS ss);
4101 if (dlhandle != NULL) dlclose(dlhandle);
4105 exim_exit(EXIT_SUCCESS);
4109 /* The active host name is normally the primary host name, but it can be varied
4110 for hosts that want to play several parts at once. We need to ensure that it is
4111 set for host checking, and for receiving messages. */
4113 smtp_active_hostname = primary_hostname;
4114 if (raw_active_hostname != NULL)
4116 uschar *nah = expand_string(raw_active_hostname);
4119 if (!expand_string_forcedfail)
4120 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4121 "(smtp_active_hostname): %s", raw_active_hostname,
4122 expand_string_message);
4124 else if (nah[0] != 0) smtp_active_hostname = nah;
4127 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4128 given IP address so that the blocking and relay configuration can be tested. An
4129 RFC 1413 call is made only if we are running in the test harness and an
4130 incoming interface and both ports are specified, because there is no TCP/IP
4131 call to find the ident for. */
4138 sender_ident = NULL;
4139 if (running_in_test_harness && sender_host_port != 0 &&
4140 interface_address != NULL && interface_port != 0)
4141 verify_get_ident(1413);
4143 /* In case the given address is a non-canonical IPv6 address, canonicize
4144 it. The code works for both IPv4 and IPv6, as it happens. */
4146 size = host_aton(sender_host_address, x);
4147 sender_host_address = store_get(48); /* large enough for full IPv6 */
4148 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4150 /* Now set up for testing */
4152 host_build_sender_fullhost();
4156 sender_local = FALSE;
4157 sender_host_notsocket = TRUE;
4158 debug_file = stderr;
4159 debug_fd = fileno(debug_file);
4160 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4161 "**** but without any ident (RFC 1413) callback.\n"
4162 "**** This is not for real!\n\n",
4163 sender_host_address);
4165 if (verify_check_host(&hosts_connection_nolog) == OK)
4166 log_write_selector &= ~L_smtp_connection;
4167 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4169 if (smtp_start_session())
4171 reset_point = store_get(0);
4174 store_reset(reset_point);
4175 if (smtp_setup_msg() <= 0) break;
4176 if (!receive_msg(FALSE)) break;
4179 exim_exit(EXIT_SUCCESS);
4183 /* Arrange for message reception if recipients or SMTP were specified;
4184 otherwise complain unless a version print (-bV) happened or this is a filter
4185 verification test. In the former case, show the configuration file name. */
4187 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4189 if (version_printed)
4191 printf("Configuration file is %s\n", config_main_filename);
4192 return EXIT_SUCCESS;
4194 if (filter_test == FTEST_NONE)
4197 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4198 "not directly from a shell command line. Options and/or arguments control\n"
4199 "what it does when called. For a list of options, see the Exim documentation.\n");
4200 return EXIT_FAILURE;
4205 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4206 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4207 that we are not called from inetd, because that is rejected above. The
4208 following configuration settings are forced here:
4210 (1) Synchronous delivery (-odi)
4211 (2) Errors to stderr (-oep == -oeq)
4212 (3) No parallel remote delivery
4213 (4) Unprivileged delivery
4215 We don't force overall queueing options because there are several of them;
4216 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4217 to override any SMTP queueing. */
4221 synchronous_delivery = TRUE;
4222 arg_error_handling = ERRORS_STDERR;
4223 remote_max_parallel = 1;
4224 deliver_drop_privilege = TRUE;
4226 queue_smtp_domains = NULL;
4230 /* Prepare to accept one or more new messages on the standard input. When a
4231 message has been read, its id is returned in message_id[]. If doing immediate
4232 delivery, we fork a delivery process for each received message, except for the
4233 last one, where we can save a process switch.
4235 It is only in non-smtp mode that error_handling is allowed to be changed from
4236 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4237 sendmail error modes other than -oem ever actually used? Later: yes.) */
4239 if (!smtp_input) error_handling = arg_error_handling;
4241 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4242 logging being sent down the socket and make an identd call to get the
4248 exim_nullstd(); /* Re-open to /dev/null */
4249 verify_get_ident(IDENT_PORT);
4250 host_build_sender_fullhost();
4251 set_process_info("handling incoming connection from %s via inetd",
4255 /* If the sender host address has been set, build sender_fullhost if it hasn't
4256 already been done (which it will have been for inetd). This caters for the
4257 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4258 so that the test for IP options is skipped for -bs input. */
4260 if (sender_host_address != NULL && sender_fullhost == NULL)
4262 host_build_sender_fullhost();
4263 set_process_info("handling incoming connection from %s via -oMa",
4265 sender_host_notsocket = TRUE;
4268 /* Otherwise, set the sender host as unknown except for inetd calls. This
4269 prevents host checking in the case of -bs not from inetd and also for -bS. */
4271 else if (!is_inetd) sender_host_unknown = TRUE;
4273 /* If stdout does not exist, then dup stdin to stdout. This can happen
4274 if exim is started from inetd. In this case fd 0 will be set to the socket,
4275 but fd 1 will not be set. This also happens for passed SMTP channels. */
4277 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4279 /* Set up the incoming protocol name and the state of the program. Root
4280 is allowed to force received protocol via the -oMr option above, and if we are
4281 in a non-local SMTP state it means we have come via inetd and the process info
4282 has already been set up. We don't set received_protocol here for smtp input,
4283 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4287 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4292 if (received_protocol == NULL)
4293 received_protocol = string_sprintf("local%s", called_as);
4294 set_process_info("accepting a local non-SMTP message from <%s>",
4298 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4302 local_queue_only = queue_only;
4304 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4305 the spool if so configured. On failure, we must not attempt to send an error
4306 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4307 error code is given.) */
4309 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4311 fprintf(stderr, "exim: insufficient disk space\n");
4312 return EXIT_FAILURE;
4315 /* If this is smtp input of any kind, handle the start of the SMTP
4322 if (verify_check_host(&hosts_connection_nolog) == OK)
4323 log_write_selector &= ~L_smtp_connection;
4324 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4325 if (!smtp_start_session())
4328 exim_exit(EXIT_SUCCESS);
4332 /* Otherwise, set up the input size limit here */
4336 thismessage_size_limit = expand_string_integer(message_size_limit);
4337 if (thismessage_size_limit < 0)
4339 if (thismessage_size_limit == -1)
4340 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4341 "message_size_limit: %s", expand_string_message);
4343 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4344 "message_size_limit: %s", expand_string_message);
4348 /* Loop for several messages when reading SMTP input. If we fork any child
4349 processes, we don't want to wait for them unless synchronous delivery is
4350 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4351 same as SIG_DFL, despite the fact that documentation often lists the default as
4352 "ignore". This is a confusing area. This is what I know:
4354 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4355 processes that complete simply to go away without ever becoming defunct. You
4356 can't then wait for them - but we don't want to wait for them in the
4357 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4358 happen for all OS (e.g. *BSD is different).
4360 But that's not the end of the story. Some (many? all?) systems have the
4361 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4362 has by default, so it seems that the difference is merely one of default
4363 (compare restarting vs non-restarting signals).
4365 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4366 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4367 of the loop below. Paranoia rules.
4369 February 2003: That's *still* not the end of the story. There are now versions
4370 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4371 process then calls waitpid(), a grumble is written to the system log, because
4372 this is logically inconsistent. In other words, it doesn't like the paranoia.
4373 As a consequenc of this, the waitpid() below is now excluded if we are sure
4374 that SIG_IGN works. */
4376 if (!synchronous_delivery)
4379 struct sigaction act;
4380 act.sa_handler = SIG_IGN;
4381 sigemptyset(&(act.sa_mask));
4382 act.sa_flags = SA_NOCLDWAIT;
4383 sigaction(SIGCHLD, &act, NULL);
4385 signal(SIGCHLD, SIG_IGN);
4389 /* Save the current store pool point, for resetting at the start of
4390 each message, and save the real sender address, if any. */
4392 reset_point = store_get(0);
4393 real_sender_address = sender_address;
4395 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4396 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4401 store_reset(reset_point);
4404 /* In the SMTP case, we have to handle the initial SMTP input and build the
4405 recipients list, before calling receive_msg() to read the message proper.
4406 Whatever sender address is actually given in the SMTP transaction is
4407 actually ignored for local senders - we use the actual sender, which is
4408 normally either the underlying user running this process or a -f argument
4409 provided by a trusted caller. It is saved in real_sender_address.
4411 However, if this value is NULL, we are dealing with a trusted caller when
4412 -f was not used; in this case, the SMTP sender is allowed to stand.
4414 Also, if untrusted_set_sender is set, we permit sender addresses that match
4415 anything in its list.
4417 The variable raw_sender_address holds the sender address before rewriting. */
4422 if ((rc = smtp_setup_msg()) > 0)
4424 if (real_sender_address != NULL &&
4425 !receive_check_set_sender(sender_address))
4427 sender_address = raw_sender = real_sender_address;
4428 sender_address_unrewritten = NULL;
4430 more = receive_msg(extract_recipients);
4431 if (message_id[0] == 0)
4434 exim_exit(EXIT_FAILURE);
4437 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4440 /* In the non-SMTP case, we have all the information from the command
4441 line, but must process it in case it is in the more general RFC822
4442 format, and in any case, to detect syntax errors. Also, it appears that
4443 the use of comma-separated lists as single arguments is common, so we
4444 had better support them. */
4450 int count = argc - recipients_arg;
4451 uschar **list = argv + recipients_arg;
4453 /* These options cannot be changed dynamically for non-SMTP messages */
4455 active_local_sender_retain = local_sender_retain;
4456 active_local_from_check = local_from_check;
4458 /* Save before any rewriting */
4460 raw_sender = string_copy(sender_address);
4462 /* Loop for each argument */
4464 for (i = 0; i < count; i++)
4466 int start, end, domain;
4468 uschar *s = list[i];
4470 /* Loop for each comma-separated address */
4474 BOOL finished = FALSE;
4476 uschar *ss = parse_find_address_end(s, FALSE);
4478 if (*ss == ',') *ss = 0; else finished = TRUE;
4480 /* Check max recipients - if -t was used, these aren't recipients */
4482 if (recipients_max > 0 && ++rcount > recipients_max &&
4483 !extract_recipients)
4485 if (error_handling == ERRORS_STDERR)
4487 fprintf(stderr, "exim: too many recipients\n");
4488 exim_exit(EXIT_FAILURE);
4493 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4494 errors_sender_rc : EXIT_FAILURE;
4499 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4501 if (domain == 0 && !allow_unqualified_recipient)
4504 errmess = US"unqualified recipient address not allowed";
4507 if (recipient == NULL)
4509 if (error_handling == ERRORS_STDERR)
4511 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4512 string_printing(list[i]), errmess);
4513 exim_exit(EXIT_FAILURE);
4519 eblock.text1 = string_printing(list[i]);
4520 eblock.text2 = errmess;
4522 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4523 errors_sender_rc : EXIT_FAILURE;
4527 receive_add_recipient(recipient, -1);
4530 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4534 /* Show the recipients when debugging */
4539 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4540 if (recipients_list != NULL)
4542 debug_printf("Recipients:\n");
4543 for (i = 0; i < recipients_count; i++)
4544 debug_printf(" %s\n", recipients_list[i].address);
4548 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4549 will just read the headers for the message, and not write anything onto the
4552 message_ended = END_NOTENDED;
4553 more = receive_msg(extract_recipients);
4555 /* more is always FALSE here (not SMTP message) when reading a message
4556 for real; when reading the headers of a message for filter testing,
4557 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4559 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4560 } /* Non-SMTP message reception */
4562 /* If this is a filter testing run, there are headers in store, but
4563 no message on the spool. Run the filtering code in testing mode, setting
4564 the domain to the qualify domain and the local part to the current user,
4565 unless they have been set by options. The prefix and suffix are left unset
4566 unless specified. The the return path is set to to the sender unless it has
4567 already been set from a return-path header in the message. */
4569 if (filter_test != FTEST_NONE)
4571 deliver_domain = (ftest_domain != NULL)?
4572 ftest_domain : qualify_domain_recipient;
4573 deliver_domain_orig = deliver_domain;
4574 deliver_localpart = (ftest_localpart != NULL)?
4575 ftest_localpart : originator_login;
4576 deliver_localpart_orig = deliver_localpart;
4577 deliver_localpart_prefix = ftest_prefix;
4578 deliver_localpart_suffix = ftest_suffix;
4579 deliver_home = originator_home;
4581 if (return_path == NULL)
4583 printf("Return-path copied from sender\n");
4584 return_path = string_copy(sender_address);
4588 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4590 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4592 receive_add_recipient(
4593 string_sprintf("%s%s%s@%s",
4594 (ftest_prefix == NULL)? US"" : ftest_prefix,
4596 (ftest_suffix == NULL)? US"" : ftest_suffix,
4597 deliver_domain), -1);
4599 printf("Recipient = %s\n", recipients_list[0].address);
4600 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4601 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4603 chdir("/"); /* Get away from wherever the user is running this from */
4605 /* Now we run either a system filter test, or a user filter test, or both.
4606 In the latter case, headers added by the system filter will persist and be
4607 available to the user filter. We need to copy the filter variables
4610 if ((filter_test & FTEST_SYSTEM) != 0)
4612 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4613 exim_exit(EXIT_FAILURE);
4616 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4618 if ((filter_test & FTEST_USER) != 0)
4620 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4621 exim_exit(EXIT_FAILURE);
4624 exim_exit(EXIT_SUCCESS);
4627 /* Else act on the result of message reception. We should not get here unless
4628 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4629 TRUE. If it is not, check on the number of messages received in this
4630 connection. If that's OK and queue_only_load is set, check that the load
4631 average is below it. If it is not, set local_queue_only TRUE. Note that it
4632 then remains this way for any subsequent messages on the same SMTP connection.
4633 This is a deliberate choice; even though the load average may fall, it
4634 doesn't seem right to deliver later messages on the same call when not
4635 delivering earlier ones. */
4637 if (!local_queue_only)
4639 if (smtp_accept_queue_per_connection > 0 &&
4640 receive_messagecount > smtp_accept_queue_per_connection)
4642 local_queue_only = TRUE;
4643 queue_only_reason = 2;
4645 else if (queue_only_load >= 0)
4647 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4648 if (local_queue_only) queue_only_reason = 3;
4652 /* If running as an MUA wrapper, all queueing options and freezing options
4656 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4658 /* Log the queueing here, when it will get a message id attached, but
4659 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4662 if (local_queue_only) switch(queue_only_reason)
4665 log_write(L_delay_delivery,
4666 LOG_MAIN, "no immediate delivery: more than %d messages "
4667 "received in one connection", smtp_accept_queue_per_connection);
4671 log_write(L_delay_delivery,
4672 LOG_MAIN, "no immediate delivery: load average %.2f",
4673 (double)load_average/1000.0);
4677 /* Else do the delivery unless the ACL or local_scan() called for queue only
4678 or froze the message. Always deliver in a separate process. A fork failure is
4679 not a disaster, as the delivery will eventually happen on a subsequent queue
4680 run. The search cache must be tidied before the fork, as the parent will
4681 do it before exiting. The child will trigger a lookup failure and
4682 thereby defer the delivery if it tries to use (for example) a cached ldap
4683 connection that the parent has called unbind on. */
4685 else if (!queue_only_policy && !deliver_freeze)
4690 if ((pid = fork()) == 0)
4693 close_unwanted(); /* Close unwanted file descriptors and TLS */
4694 exim_nullstd(); /* Ensure std{in,out,err} exist */
4696 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4697 mode, deliver_drop_privilege is forced TRUE). */
4699 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4701 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4703 /* Control does not return here. */
4706 /* No need to re-exec */
4708 rc = deliver_message(message_id, FALSE, FALSE);
4710 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4711 EXIT_SUCCESS : EXIT_FAILURE);
4716 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4717 "process: %s", strerror(errno));
4720 /* In the parent, wait if synchronous delivery is required. This will
4721 always be the case in MUA wrapper mode. */
4723 else if (synchronous_delivery)
4726 while (wait(&status) != pid);
4727 if ((status & 0x00ff) != 0)
4728 log_write(0, LOG_MAIN|LOG_PANIC,
4729 "process %d crashed with signal %d while delivering %s",
4730 (int)pid, status & 0x00ff, message_id);
4731 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4735 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4736 automatically reaps children (see comments above the loop), clear away any
4737 finished subprocesses here, in case there are lots of messages coming in
4738 from the same source. */
4740 #ifndef SIG_IGN_WORKS
4741 while (waitpid(-1, NULL, WNOHANG) > 0);
4745 exim_exit(EXIT_SUCCESS); /* Never returns */
4746 return 0; /* To stop compiler warning */