1 /* $Cambridge: exim/src/src/exim.c,v 1.20 2005/05/31 11:10:50 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
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, and terminates it before the
590 port data when a port is extracted.
593 address the address, with possible port on the end
595 Returns: the port, or zero if there isn't one
596 bombs out on a syntax error
600 check_port(uschar *address)
602 int port = host_extract_port(address);
603 if (string_is_ip_address(address, NULL) == 0)
605 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
613 /*************************************************
614 * Test/verify an address *
615 *************************************************/
617 /* This function is called by the -bv and -bt code. It extracts a working
618 address from a full RFC 822 address. This isn't really necessary per se, but it
619 has the effect of collapsing source routes.
623 flags flag bits for verify_address()
624 exit_value to be set for failures
630 test_address(uschar *s, int flags, int *exit_value)
632 int start, end, domain;
633 uschar *parse_error = NULL;
634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
638 fprintf(stdout, "syntax error: %s\n", parse_error);
643 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
644 -1, -1, NULL, NULL, NULL);
645 if (rc == FAIL) *exit_value = 2;
646 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
652 /*************************************************
653 * Decode bit settings for log/debug *
654 *************************************************/
656 /* This function decodes a string containing bit settings in the form of +name
657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
658 also recognizes a numeric setting of the form =<number>, but this is not
659 intended for user use. It's an easy way for Exim to pass the debug settings
660 when it is re-exec'ed.
662 The log options are held in two unsigned ints (because there became too many
663 for one). The top bit in the table means "put in 2nd selector". This does not
664 yet apply to debug options, so the "=" facility sets only the first selector.
666 A bad value for a debug setting is treated as an unknown option - error message
667 to stderr and die. For log settings, which come from the configuration file,
668 we write to the log on the way out...
671 selector1 address of the first bit string
672 selector2 address of the second bit string, or NULL
673 string the configured string
674 options the table of option names
676 which "log" or "debug"
678 Returns: nothing on success - bomb out on failure
682 decode_bits(unsigned int *selector1, unsigned int *selector2, uschar *string,
683 bit_table *options, int count, uschar *which)
686 if (string == NULL) return;
690 char *end; /* Not uschar */
691 *selector1 = strtoul(CS string+1, &end, 0);
692 if (*end == 0) return;
693 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
698 /* Handle symbolic setting */
705 bit_table *start, *end;
707 while (isspace(*string)) string++;
708 if (*string == 0) return;
710 if (*string != '+' && *string != '-')
712 errmsg = string_sprintf("malformed %s_selector setting: "
713 "+ or - expected but found \"%s\"", which, string);
717 adding = *string++ == '+';
719 while (isalnum(*string) || *string == '_') string++;
723 end = options + count;
727 bit_table *middle = start + (end - start)/2;
728 int c = Ustrncmp(s, middle->name, len);
731 if (middle->name[len] != 0) c = -1; else
733 unsigned int bit = middle->bit;
734 unsigned int *selector;
736 /* The value with all bits set means "set all bits in both selectors"
737 in the case where two are being handled. However, the top bit in the
738 second selector is never set. */
740 if (bit == 0xffffffff)
742 *selector1 = adding? bit : 0;
743 if (selector2 != NULL) *selector2 = adding? 0x7fffffff : 0;
746 /* Otherwise, the 0x80000000 bit means "this value, without the top
747 bit, belongs in the second selector". */
751 if ((bit & 0x80000000) != 0)
753 selector = selector2;
756 else selector = selector1;
757 if (adding) *selector |= bit; else *selector &= ~bit;
759 break; /* Out of loop to match selector name */
762 if (c < 0) end = middle; else start = middle + 1;
763 } /* Loop to match selector name */
767 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
768 adding? '+' : '-', len, s);
771 } /* Loop for selector names */
773 /* Handle disasters */
776 if (Ustrcmp(which, "debug") == 0)
778 fprintf(stderr, "exim: %s\n", errmsg);
781 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
786 /*************************************************
787 * Show supported features *
788 *************************************************/
790 /* This function is called for -bV and for -d to output the optional features
791 of the current Exim binary.
793 Arguments: a FILE for printing
798 show_whats_supported(FILE *f)
800 #ifdef DB_VERSION_STRING
801 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
802 #elif defined(BTREEVERSION) && defined(HASHVERSION)
804 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
806 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
808 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
809 fprintf(f, "Probably ndbm\n");
810 #elif defined(USE_TDB)
811 fprintf(f, "Using tdb\n");
814 fprintf(f, "Probably GDBM (native mode)\n");
816 fprintf(f, "Probably GDBM (compatibility mode)\n");
820 fprintf(f, "Support for:");
822 fprintf(f, " iconv()");
834 fprintf(f, " Expand_dlfunc");
836 #ifdef USE_TCP_WRAPPERS
837 fprintf(f, " TCPwrappers");
841 fprintf(f, " GnuTLS");
843 fprintf(f, " OpenSSL");
846 #ifdef WITH_CONTENT_SCAN
847 fprintf(f, " Content_Scanning");
849 #ifdef WITH_OLD_DEMIME
850 fprintf(f, " Old_Demime");
852 #ifdef EXPERIMENTAL_SPF
853 fprintf(f, " Experimental_SPF");
855 #ifdef EXPERIMENTAL_SRS
856 fprintf(f, " Experimental_SRS");
858 #ifdef EXPERIMENTAL_BRIGHTMAIL
859 fprintf(f, " Experimental_Brightmail");
861 #ifdef EXPERIMENTAL_DOMAINKEYS
862 fprintf(f, " Experimental_DomainKeys");
866 fprintf(f, "Lookups:");
867 #ifdef LOOKUP_LSEARCH
868 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
874 fprintf(f, " dbm dbmnz");
877 fprintf(f, " dnsdb");
879 #ifdef LOOKUP_DSEARCH
880 fprintf(f, " dsearch");
883 fprintf(f, " ibase");
886 fprintf(f, " ldap ldapdn ldapm");
889 fprintf(f, " mysql");
892 fprintf(f, " nis nis0");
894 #ifdef LOOKUP_NISPLUS
895 fprintf(f, " nisplus");
898 fprintf(f, " oracle");
901 fprintf(f, " passwd");
904 fprintf(f, " pgsql");
907 fprintf(f, " testdb");
910 fprintf(f, " whoson");
914 fprintf(f, "Authenticators:");
916 fprintf(f, " cram_md5");
918 #ifdef AUTH_CYRUS_SASL
919 fprintf(f, " cyrus_sasl");
921 #ifdef AUTH_PLAINTEXT
922 fprintf(f, " plaintext");
929 fprintf(f, "Routers:");
931 fprintf(f, " accept");
933 #ifdef ROUTER_DNSLOOKUP
934 fprintf(f, " dnslookup");
936 #ifdef ROUTER_IPLITERAL
937 fprintf(f, " ipliteral");
939 #ifdef ROUTER_IPLOOKUP
940 fprintf(f, " iplookup");
942 #ifdef ROUTER_MANUALROUTE
943 fprintf(f, " manualroute");
945 #ifdef ROUTER_QUERYPROGRAM
946 fprintf(f, " queryprogram");
948 #ifdef ROUTER_REDIRECT
949 fprintf(f, " redirect");
953 fprintf(f, "Transports:");
954 #ifdef TRANSPORT_APPENDFILE
955 fprintf(f, " appendfile");
956 #ifdef SUPPORT_MAILDIR
957 fprintf(f, "/maildir");
959 #ifdef SUPPORT_MAILSTORE
960 fprintf(f, "/mailstore");
966 #ifdef TRANSPORT_AUTOREPLY
967 fprintf(f, " autoreply");
969 #ifdef TRANSPORT_LMTP
972 #ifdef TRANSPORT_PIPE
975 #ifdef TRANSPORT_SMTP
980 if (fixed_never_users[0] > 0)
983 fprintf(f, "Fixed never_users: ");
984 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
985 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
986 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
993 /*************************************************
994 * Quote a local part *
995 *************************************************/
997 /* This function is used when a sender address or a From: or Sender: header
998 line is being created from the caller's login, or from an authenticated_id. It
999 applies appropriate quoting rules for a local part.
1001 Argument: the local part
1002 Returns: the local part, quoted if necessary
1006 local_part_quote(uschar *lpart)
1008 BOOL needs_quote = FALSE;
1013 for (t = lpart; !needs_quote && *t != 0; t++)
1015 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1016 (*t != '.' || t == lpart || t[1] == 0);
1019 if (!needs_quote) return lpart;
1022 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1026 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1029 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1032 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1033 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1034 yield = string_cat(yield, &size, &ptr, nq, 1);
1038 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1046 /*************************************************
1047 * Load readline() functions *
1048 *************************************************/
1050 /* This function is called from testing executions that read data from stdin,
1051 but only when running as the calling user. Currently, only -be does this. The
1052 function loads the readline() function library and passes back the functions.
1053 On some systems, it needs the curses library, so load that too, but try without
1054 it if loading fails. All this functionality has to be requested at build time.
1057 fn_readline_ptr pointer to where to put the readline pointer
1058 fn_addhist_ptr pointer to where to put the addhistory function
1060 Returns: the dlopen handle or NULL on failure
1064 set_readline(char * (**fn_readline_ptr)(char *),
1065 char * (**fn_addhist_ptr)(char *))
1068 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1070 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1071 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1073 if (dlhandle != NULL)
1075 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1076 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1080 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1089 /*************************************************
1090 * Get a line from stdin for testing things *
1091 *************************************************/
1093 /* This function is called when running tests that can take a number of lines
1094 of input (for example, -be and -bt). It handles continuations and trailing
1095 spaces. And prompting and a blank line output on eof. If readline() is in use,
1096 the arguments are non-NULL and provide the relevant functions.
1099 fn_readline readline function or NULL
1100 fn_addhist addhist function or NULL
1102 Returns: pointer to dynamic memory, or NULL at end of file
1106 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1111 uschar *yield = NULL;
1113 if (fn_readline == NULL) printf("> ");
1117 uschar buffer[1024];
1121 char *readline_line = NULL;
1122 if (fn_readline != NULL)
1124 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1125 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1126 p = US readline_line;
1131 /* readline() not in use */
1134 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1138 /* Handle the line */
1140 ss = p + (int)Ustrlen(p);
1141 while (ss > p && isspace(ss[-1])) ss--;
1145 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1148 yield = string_cat(yield, &size, &ptr, p, ss - p);
1151 if (fn_readline != NULL) free(readline_line);
1154 if (ss == p || yield[ptr-1] != '\\')
1162 if (yield == NULL) printf("\n");
1168 /*************************************************
1169 * Entry point and high-level code *
1170 *************************************************/
1172 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1173 the appropriate action. All the necessary functions are present in the one
1174 binary. I originally thought one should split it up, but it turns out that so
1175 much of the apparatus is needed in each chunk that one might as well just have
1176 it all available all the time, which then makes the coding easier as well.
1179 argc count of entries in argv
1180 argv argument strings, with argv[0] being the program name
1182 Returns: EXIT_SUCCESS if terminated successfully
1183 EXIT_FAILURE otherwise, except when a message has been sent
1184 to the sender, and -oee was given
1188 main(int argc, char **cargv)
1190 uschar **argv = USS cargv;
1191 int arg_receive_timeout = -1;
1192 int arg_smtp_receive_timeout = -1;
1193 int arg_error_handling = error_handling;
1194 int filter_sfd = -1;
1195 int filter_ufd = -1;
1198 int list_queue_option = 0;
1200 int msg_action_arg = -1;
1201 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1202 int queue_only_reason = 0;
1204 int perl_start_option = 0;
1206 int recipients_arg = argc;
1207 int sender_address_domain = 0;
1208 int test_retry_arg = -1;
1209 int test_rewrite_arg = -1;
1210 BOOL arg_queue_only = FALSE;
1211 BOOL bi_option = FALSE;
1212 BOOL checking = FALSE;
1213 BOOL count_queue = FALSE;
1214 BOOL expansion_test = FALSE;
1215 BOOL extract_recipients = FALSE;
1216 BOOL forced_delivery = FALSE;
1217 BOOL f_end_dot = FALSE;
1218 BOOL deliver_give_up = FALSE;
1219 BOOL list_queue = FALSE;
1220 BOOL list_options = FALSE;
1221 BOOL local_queue_only;
1223 BOOL one_msg_action = FALSE;
1224 BOOL queue_only_set = FALSE;
1225 BOOL receiving_message = TRUE;
1227 BOOL removed_privilege = FALSE;
1228 BOOL verify_address_mode = FALSE;
1229 BOOL verify_as_sender = FALSE;
1230 BOOL version_printed = FALSE;
1231 uschar *alias_arg = NULL;
1232 uschar *called_as = US"";
1233 uschar *start_queue_run_id = NULL;
1234 uschar *stop_queue_run_id = NULL;
1235 uschar *ftest_domain = NULL;
1236 uschar *ftest_localpart = NULL;
1237 uschar *ftest_prefix = NULL;
1238 uschar *ftest_suffix = NULL;
1239 uschar *real_sender_address;
1240 uschar *originator_home = US"/";
1244 struct stat statbuf;
1245 pid_t passed_qr_pid = (pid_t)0;
1246 int passed_qr_pipe = -1;
1247 gid_t group_list[NGROUPS_MAX];
1249 /* Possible options for -R and -S */
1251 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1253 /* Need to define this in case we need to change the environment in order
1254 to get rid of a bogus time zone. We have to make it char rather than uschar
1255 because some OS define it in /usr/include/unistd.h. */
1257 extern char **environ;
1259 /* If the Exim user and/or group and/or the configuration file owner/group were
1260 defined by ref:name at build time, we must now find the actual uid/gid values.
1261 This is a feature to make the lives of binary distributors easier. */
1263 #ifdef EXIM_USERNAME
1264 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1266 exim_gid = pw->pw_gid;
1270 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1276 #ifdef EXIM_GROUPNAME
1277 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1279 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1285 #ifdef CONFIGURE_OWNERNAME
1286 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1288 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1289 CONFIGURE_OWNERNAME);
1294 #ifdef CONFIGURE_GROUPNAME
1295 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1297 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1298 CONFIGURE_GROUPNAME);
1303 /* In the Cygwin environment, some initialization needs doing. It is fudged
1304 in by means of this macro. */
1310 /* Check a field which is patched when we are running Exim within its
1311 testing harness; do a fast initial check, and then the whole thing. */
1313 running_in_test_harness =
1314 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1316 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1317 at the start of a program; however, it seems that some environments do not
1318 follow this. A "strange" locale can affect the formatting of timestamps, so we
1321 setlocale(LC_ALL, "C");
1323 /* Set up the default handler for timing using alarm(). */
1325 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1327 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1328 because store_malloc writes a log entry on failure. */
1330 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1331 if (log_buffer == NULL)
1333 fprintf(stderr, "exim: failed to get store for log buffer\n");
1337 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1338 NULL when the daemon is run and the file is closed. We have to use this
1339 indirection, because some systems don't allow writing to the variable "stderr".
1342 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1344 /* Arrange for the PCRE regex library to use our store functions. Note that
1345 the normal calls are actually macros that add additional arguments for
1346 debugging purposes so we have to assign specially constructed functions here.
1347 The default is to use store in the stacking pool, but this is overridden in the
1348 regex_must_compile() function. */
1350 pcre_malloc = function_store_get;
1351 pcre_free = function_dummy_free;
1353 /* Ensure there is a big buffer for temporary use in several places. It is put
1354 in malloc store so that it can be freed for enlargement if necessary. */
1356 big_buffer = store_malloc(big_buffer_size);
1358 /* Set up the handler for the data request signal, and set the initial
1359 descriptive text. */
1361 set_process_info("initializing");
1362 os_restarting_signal(SIGUSR1, usr1_handler);
1364 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1365 in the daemon code. For the rest of Exim's uses, we ignore it. */
1367 signal(SIGHUP, SIG_IGN);
1369 /* We don't want to die on pipe errors as the code is written to handle
1370 the write error instead. */
1372 signal(SIGPIPE, SIG_IGN);
1374 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1375 set to SIG_IGN. This causes subprocesses that complete before the parent
1376 process waits for them not to hang around, so when Exim calls wait(), nothing
1377 is there. The wait() code has been made robust against this, but let's ensure
1378 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1379 ending status. We use sigaction rather than plain signal() on those OS where
1380 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1381 problem on AIX with this.) */
1385 struct sigaction act;
1386 act.sa_handler = SIG_DFL;
1387 sigemptyset(&(act.sa_mask));
1389 sigaction(SIGCHLD, &act, NULL);
1392 signal(SIGCHLD, SIG_DFL);
1395 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1400 /* Set up the version number. Set up the leading 'E' for the external form of
1401 message ids, set the pointer to the internal form, and initialize it to
1402 indicate no message being processed. */
1405 message_id_option[0] = '-';
1406 message_id_external = message_id_option + 1;
1407 message_id_external[0] = 'E';
1408 message_id = message_id_external + 1;
1411 /* Set the umask to zero so that any files that Exim creates are created
1412 with the modes that it specifies. */
1416 /* Precompile the regular expression for matching a message id. Keep this in
1417 step with the code that generates ids in the accept.c module. We need to do
1418 this here, because the -M options check their arguments for syntactic validity
1419 using mac_ismsgid, which uses this. */
1422 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1424 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1425 this seems to be a generally accepted convention, since one finds symbolic
1426 links called "mailq" in standard OS configurations. */
1428 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1429 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1432 receiving_message = FALSE;
1433 called_as = US"-mailq";
1436 /* If the program is called as "rmail" treat it as equivalent to
1437 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1438 i.e. preventing a single dot on a line from terminating the message, and
1439 returning with zero return code, even in cases of error (provided an error
1440 message has been sent). */
1442 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1443 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1446 called_as = US"-rmail";
1447 errors_sender_rc = EXIT_SUCCESS;
1450 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1451 this is a smail convention. */
1453 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1454 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1456 smtp_input = smtp_batched_input = TRUE;
1457 called_as = US"-rsmtp";
1460 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1461 this is a smail convention. */
1463 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1464 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1467 receiving_message = FALSE;
1468 called_as = US"-runq";
1471 /* If the program is called as "newaliases" treat it as equivalent to
1472 "exim -bi"; this is a sendmail convention. */
1474 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1475 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1478 receiving_message = FALSE;
1479 called_as = US"-newaliases";
1482 /* Save the original effective uid for a couple of uses later. It should
1483 normally be root, but in some esoteric environments it may not be. */
1485 original_euid = geteuid();
1487 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1488 to be the same as the real ones. This makes a difference only if Exim is setuid
1489 (or setgid) to something other than root, which could be the case in some
1490 special configurations. */
1492 real_uid = getuid();
1493 real_gid = getgid();
1495 if (real_uid == root_uid)
1501 /* If neither the original real uid nor the original euid was root, Exim is
1502 running in an unprivileged state. */
1504 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1506 /* If the first argument is --help, pretend there are no arguments. This will
1507 cause a brief message to be given. */
1509 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1511 /* Scan the program's arguments. Some can be dealt with right away; others are
1512 simply recorded for checking and handling afterwards. Do a high-level switch
1513 on the second character (the one after '-'), to save some effort. */
1515 for (i = 1; i < argc; i++)
1517 BOOL badarg = FALSE;
1518 uschar *arg = argv[i];
1522 /* An argument not starting with '-' is the start of a recipients list;
1523 break out of the options-scanning loop. */
1531 /* An option consistion of -- terminates the options */
1533 if (Ustrcmp(arg, "--") == 0)
1535 recipients_arg = i + 1;
1539 /* Handle flagged options */
1541 switchchar = arg[1];
1544 /* Make all -ex options synonymous with -oex arguments, since that
1545 is assumed by various callers. Also make -qR options synonymous with -R
1546 options, as that seems to be required as well. Allow for -qqR too, and
1547 the same for -S options. */
1549 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1550 Ustrncmp(arg+1, "qR", 2) == 0 ||
1551 Ustrncmp(arg+1, "qS", 2) == 0)
1553 switchchar = arg[2];
1556 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1558 switchchar = arg[3];
1560 queue_2stage = TRUE;
1563 /* Make -r synonymous with -f, since it is a documented alias */
1565 else if (arg[1] == 'r') switchchar = 'f';
1567 /* Make -ov synonymous with -v */
1569 else if (Ustrcmp(arg, "-ov") == 0)
1575 /* High-level switch on active initial letter */
1579 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1580 so has no need of it. */
1583 if (*argrest == 0) i++; /* Skip over the type */
1588 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1590 /* -bd: Run in daemon mode, awaiting SMTP connections.
1591 -bdf: Ditto, but in the foreground.
1594 if (*argrest == 'd')
1596 daemon_listen = TRUE;
1597 if (*(++argrest) == 'f') background_daemon = FALSE;
1598 else if (*argrest != 0) { badarg = TRUE; break; }
1601 /* -be: Run in expansion test mode */
1603 else if (*argrest == 'e')
1604 expansion_test = checking = TRUE;
1606 /* -bF: Run system filter test */
1608 else if (*argrest == 'F')
1610 filter_test |= FTEST_SYSTEM;
1611 if (*(++argrest) != 0) { badarg = TRUE; break; }
1612 if (++i < argc) filter_test_sfile = argv[i]; else
1614 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1619 /* -bf: Run user filter test
1620 -bfd: Set domain for filter testing
1621 -bfl: Set local part for filter testing
1622 -bfp: Set prefix for filter testing
1623 -bfs: Set suffix for filter testing
1626 else if (*argrest == 'f')
1628 if (*(++argrest) == 0)
1630 filter_test |= FTEST_USER;
1631 if (++i < argc) filter_test_ufile = argv[i]; else
1633 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1641 fprintf(stderr, "exim: string expected after %s\n", arg);
1644 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1645 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1646 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1647 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1648 else { badarg = TRUE; break; }
1652 /* -bh: Host checking - an IP address must follow. */
1654 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1656 if (++i >= argc) { badarg = TRUE; break; }
1657 sender_host_address = argv[i];
1658 host_checking = checking = log_testing_mode = TRUE;
1659 host_checking_callout = argrest[1] == 'c';
1662 /* -bi: This option is used by sendmail to initialize *the* alias file,
1663 though it has the -oA option to specify a different file. Exim has no
1664 concept of *the* alias file, but since Sun's YP make script calls
1665 sendmail this way, some support must be provided. */
1667 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1669 /* -bm: Accept and deliver message - the default option. Reinstate
1670 receiving_message, which got turned off for all -b options. */
1672 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1674 /* -bnq: For locally originating messages, do not qualify unqualified
1675 addresses. In the envelope, this causes errors; in header lines they
1678 else if (Ustrcmp(argrest, "nq") == 0)
1680 allow_unqualified_sender = FALSE;
1681 allow_unqualified_recipient = FALSE;
1684 /* -bpxx: List the contents of the mail queue, in various forms. If
1685 the option is -bpc, just a queue count is needed. Otherwise, if the
1686 first letter after p is r, then order is random. */
1688 else if (*argrest == 'p')
1690 if (*(++argrest) == 'c')
1693 if (*(++argrest) != 0) badarg = TRUE;
1697 if (*argrest == 'r')
1699 list_queue_option = 8;
1702 else list_queue_option = 0;
1706 /* -bp: List the contents of the mail queue, top-level only */
1708 if (*argrest == 0) {}
1710 /* -bpu: List the contents of the mail queue, top-level undelivered */
1712 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1714 /* -bpa: List the contents of the mail queue, including all delivered */
1716 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1718 /* Unknown after -bp[r] */
1728 /* -bP: List the configuration variables given as the address list.
1729 Force -v, so configuration errors get displayed. */
1731 else if (Ustrcmp(argrest, "P") == 0)
1733 list_options = TRUE;
1734 debug_selector |= D_v;
1735 debug_file = stderr;
1738 /* -brt: Test retry configuration lookup */
1740 else if (Ustrcmp(argrest, "rt") == 0)
1742 test_retry_arg = i + 1;
1746 /* -brw: Test rewrite configuration */
1748 else if (Ustrcmp(argrest, "rw") == 0)
1750 test_rewrite_arg = i + 1;
1754 /* -bS: Read SMTP commands on standard input, but produce no replies -
1755 all errors are reported by sending messages. */
1757 else if (Ustrcmp(argrest, "S") == 0)
1758 smtp_input = smtp_batched_input = receiving_message = TRUE;
1760 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1761 on standard output. */
1763 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1765 /* -bt: address testing mode */
1767 else if (Ustrcmp(argrest, "t") == 0)
1768 address_test_mode = checking = log_testing_mode = TRUE;
1770 /* -bv: verify addresses */
1772 else if (Ustrcmp(argrest, "v") == 0)
1773 verify_address_mode = checking = log_testing_mode = TRUE;
1775 /* -bvs: verify sender addresses */
1777 else if (Ustrcmp(argrest, "vs") == 0)
1779 verify_address_mode = checking = log_testing_mode = TRUE;
1780 verify_as_sender = TRUE;
1783 /* -bV: Print version string and support details */
1785 else if (Ustrcmp(argrest, "V") == 0)
1787 printf("Exim version %s #%s built %s\n", version_string,
1788 version_cnumber, version_date);
1789 printf("%s\n", CS version_copyright);
1790 version_printed = TRUE;
1791 show_whats_supported(stdout);
1798 /* -C: change configuration file list; ignore if it isn't really
1799 a change! Enforce a prefix check if required. */
1804 if(++i < argc) argrest = argv[i]; else
1805 { badarg = TRUE; break; }
1807 if (Ustrcmp(config_main_filelist, argrest) != 0)
1809 #ifdef ALT_CONFIG_PREFIX
1811 int len = Ustrlen(ALT_CONFIG_PREFIX);
1812 uschar *list = argrest;
1814 while((filename = string_nextinlist(&list, &sep, big_buffer,
1815 big_buffer_size)) != NULL)
1817 if ((Ustrlen(filename) < len ||
1818 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1819 Ustrstr(filename, "/../") != NULL) &&
1820 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1822 fprintf(stderr, "-C Permission denied\n");
1828 config_main_filelist = argrest;
1829 config_changed = TRUE;
1834 /* -D: set up a macro definition */
1837 #ifdef DISABLE_D_OPTION
1838 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1843 macro_item *mlast = NULL;
1846 uschar *s = argrest;
1848 while (isspace(*s)) s++;
1850 if (*s < 'A' || *s > 'Z')
1852 fprintf(stderr, "exim: macro name set by -D must start with "
1853 "an upper case letter\n");
1857 while (isalnum(*s) || *s == '_')
1859 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1863 if (ptr == 0) { badarg = TRUE; break; }
1864 while (isspace(*s)) s++;
1867 if (*s++ != '=') { badarg = TRUE; break; }
1868 while (isspace(*s)) s++;
1871 for (m = macros; m != NULL; m = m->next)
1873 if (Ustrcmp(m->name, name) == 0)
1875 fprintf(stderr, "exim: duplicated -D in command line\n");
1881 m = store_get(sizeof(macro_item) + Ustrlen(name));
1883 m->command_line = TRUE;
1884 if (mlast == NULL) macros = m; else mlast->next = m;
1885 Ustrcpy(m->name, name);
1886 m->replacement = string_copy(s);
1888 if (clmacro_count >= MAX_CLMACROS)
1890 fprintf(stderr, "exim: too many -D options on command line\n");
1893 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1899 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1900 The latter is now a no-op, retained for compatibility only. If -dd is used,
1901 debugging subprocesses of the daemon is disabled. */
1904 if (Ustrcmp(argrest, "ropcr") == 0)
1906 /* drop_cr = TRUE; */
1909 /* Use an intermediate variable so that we don't set debugging while
1910 decoding the debugging bits. */
1914 unsigned int selector = D_default;
1917 if (*argrest == 'd')
1919 debug_daemon = TRUE;
1923 decode_bits(&selector, NULL, argrest, debug_options,
1924 debug_options_count, US"debug");
1925 debug_selector = selector;
1930 /* -E: This is a local error message. This option is not intended for
1931 external use at all, but is not restricted to trusted callers because it
1932 does no harm (just suppresses certain error messages) and if Exim is run
1933 not setuid root it won't always be trusted when it generates error
1934 messages using this option. If there is a message id following -E, point
1935 message_reference at it, for logging. */
1938 local_error_message = TRUE;
1939 if (mac_ismsgid(argrest)) message_reference = argrest;
1943 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1944 option, so it looks as if historically the -oex options are also callable
1945 without the leading -o. So we have to accept them. Before the switch,
1946 anything starting -oe has been converted to -e. Exim does not support all
1947 of the sendmail error options. */
1950 if (Ustrcmp(argrest, "e") == 0)
1952 arg_error_handling = ERRORS_SENDER;
1953 errors_sender_rc = EXIT_SUCCESS;
1955 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1956 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1957 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1958 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1963 /* -F: Set sender's full name, used instead of the gecos entry from
1964 the password file. Since users can usually alter their gecos entries,
1965 there's no security involved in using this instead. The data can follow
1966 the -F or be in the next argument. */
1971 if(++i < argc) argrest = argv[i]; else
1972 { badarg = TRUE; break; }
1974 originator_name = argrest;
1978 /* -f: Set sender's address - this value is only actually used if Exim is
1979 run by a trusted user, or if untrusted_set_sender is set and matches the
1980 address, except that the null address can always be set by any user. The
1981 test for this happens later, when the value given here is ignored when not
1982 permitted. For an untrusted user, the actual sender is still put in Sender:
1983 if it doesn't match the From: header (unless no_local_from_check is set).
1984 The data can follow the -f or be in the next argument. The -r switch is an
1985 obsolete form of -f but since there appear to be programs out there that
1986 use anything that sendmail has ever supported, better accept it - the
1987 synonymizing is done before the switch above.
1989 At this stage, we must allow domain literal addresses, because we don't
1990 know what the setting of allow_domain_literals is yet. Ditto for trailing
1991 dots and strip_trailing_dot. */
1999 if (i+1 < argc) argrest = argv[++i]; else
2000 { badarg = TRUE; break; }
2004 sender_address = string_sprintf(""); /* Ensure writeable memory */
2008 uschar *temp = argrest + Ustrlen(argrest) - 1;
2009 while (temp >= argrest && isspace(*temp)) temp--;
2010 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2011 allow_domain_literals = TRUE;
2012 strip_trailing_dot = TRUE;
2013 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2014 &sender_address_domain, TRUE);
2015 allow_domain_literals = FALSE;
2016 strip_trailing_dot = FALSE;
2017 if (sender_address == NULL)
2019 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2020 return EXIT_FAILURE;
2023 sender_address_forced = TRUE;
2027 /* This is some Sendmail thing which can be ignored */
2032 /* -h: Set the hop count for an incoming message. Exim does not currently
2033 support this; it always computes it by counting the Received: headers.
2034 To put it in will require a change to the spool header file format. */
2039 if(++i < argc) argrest = argv[i]; else
2040 { badarg = TRUE; break; }
2042 if (!isdigit(*argrest)) badarg = TRUE;
2046 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2047 not to be documented for sendmail but mailx (at least) uses it) */
2050 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2055 receiving_message = FALSE;
2057 /* -MC: continue delivery of another message via an existing open
2058 file descriptor. This option is used for an internal call by the
2059 smtp transport when there is a pending message waiting to go to an
2060 address to which it has got a connection. Five subsequent arguments are
2061 required: transport name, host name, IP address, sequence number, and
2062 message_id. Transports may decline to create new processes if the sequence
2063 number gets too big. The channel is stdin. This (-MC) must be the last
2064 argument. There's a subsequent check that the real-uid is privileged.
2066 If we are running in the test harness. delay for a bit, to let the process
2067 that set this one up complete. This makes for repeatability of the logging,
2070 if (Ustrcmp(argrest, "C") == 0)
2074 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2075 return EXIT_FAILURE;
2078 if (msg_action_arg >= 0)
2080 fprintf(stderr, "exim: incompatible arguments\n");
2081 return EXIT_FAILURE;
2084 continue_transport = argv[++i];
2085 continue_hostname = argv[++i];
2086 continue_host_address = argv[++i];
2087 continue_sequence = Uatoi(argv[++i]);
2088 msg_action = MSG_DELIVER;
2089 msg_action_arg = ++i;
2090 forced_delivery = TRUE;
2091 queue_run_pid = passed_qr_pid;
2092 queue_run_pipe = passed_qr_pipe;
2094 if (!mac_ismsgid(argv[i]))
2096 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2098 return EXIT_FAILURE;
2101 if (running_in_test_harness) millisleep(500);
2105 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2106 precedes -MC (see above). The flag indicates that the host to which
2107 Exim is connected has accepted an AUTH sequence. */
2109 else if (Ustrcmp(argrest, "CA") == 0)
2111 smtp_authenticated = TRUE;
2115 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2116 it preceded -MC (see above) */
2118 else if (Ustrcmp(argrest, "CP") == 0)
2120 smtp_use_pipelining = TRUE;
2124 /* -MCQ: pass on the pid of the queue-running process that started
2125 this chain of deliveries and the fd of its synchronizing pipe; this
2126 is useful only when it precedes -MC (see above) */
2128 else if (Ustrcmp(argrest, "CQ") == 0)
2130 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2132 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2137 /* -MCS: set the smtp_use_size flag; this is useful only when it
2138 precedes -MC (see above) */
2140 else if (Ustrcmp(argrest, "CS") == 0)
2142 smtp_use_size = TRUE;
2146 /* -MCT: set the tls_offered flag; this is useful only when it
2147 precedes -MC (see above). The flag indicates that the host to which
2148 Exim is connected has offered TLS support. */
2151 else if (Ustrcmp(argrest, "CT") == 0)
2158 /* -M[x]: various operations on the following list of message ids:
2159 -M deliver the messages, ignoring next retry times and thawing
2160 -Mc deliver the messages, checking next retry times, no thawing
2161 -Mf freeze the messages
2162 -Mg give up on the messages
2163 -Mt thaw the messages
2164 -Mrm remove the messages
2165 In the above cases, this must be the last option. There are also the
2166 following options which are followed by a single message id, and which
2167 act on that message. Some of them use the "recipient" addresses as well.
2168 -Mar add recipient(s)
2169 -Mmad mark all recipients delivered
2170 -Mmd mark recipients(s) delivered
2177 else if (*argrest == 0)
2179 msg_action = MSG_DELIVER;
2180 forced_delivery = deliver_force_thaw = TRUE;
2182 else if (Ustrcmp(argrest, "ar") == 0)
2184 msg_action = MSG_ADD_RECIPIENT;
2185 one_msg_action = TRUE;
2187 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2188 else if (Ustrcmp(argrest, "es") == 0)
2190 msg_action = MSG_EDIT_SENDER;
2191 one_msg_action = TRUE;
2193 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2194 else if (Ustrcmp(argrest, "g") == 0)
2196 msg_action = MSG_DELIVER;
2197 deliver_give_up = TRUE;
2199 else if (Ustrcmp(argrest, "mad") == 0)
2201 msg_action = MSG_MARK_ALL_DELIVERED;
2203 else if (Ustrcmp(argrest, "md") == 0)
2205 msg_action = MSG_MARK_DELIVERED;
2206 one_msg_action = TRUE;
2208 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2209 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2210 else if (Ustrcmp(argrest, "vb") == 0)
2212 msg_action = MSG_SHOW_BODY;
2213 one_msg_action = TRUE;
2215 else if (Ustrcmp(argrest, "vh") == 0)
2217 msg_action = MSG_SHOW_HEADER;
2218 one_msg_action = TRUE;
2220 else if (Ustrcmp(argrest, "vl") == 0)
2222 msg_action = MSG_SHOW_LOG;
2223 one_msg_action = TRUE;
2225 else { badarg = TRUE; break; }
2227 /* All the -Mxx options require at least one message id. */
2229 msg_action_arg = i + 1;
2230 if (msg_action_arg >= argc)
2232 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2233 return EXIT_FAILURE;
2236 /* Some require only message ids to follow */
2238 if (!one_msg_action)
2241 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2243 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2245 return EXIT_FAILURE;
2247 goto END_ARG; /* Remaining args are ids */
2250 /* Others require only one message id, possibly followed by addresses,
2251 which will be handled as normal arguments. */
2255 if (!mac_ismsgid(argv[msg_action_arg]))
2257 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2258 argv[msg_action_arg], arg);
2259 return EXIT_FAILURE;
2266 /* Some programs seem to call the -om option without the leading o;
2267 for sendmail it askes for "me too". Exim always does this. */
2270 if (*argrest != 0) badarg = TRUE;
2274 /* -N: don't do delivery - a debugging option that stops transports doing
2275 their thing. It implies debugging at the D_v level. */
2280 dont_deliver = TRUE;
2281 debug_selector |= D_v;
2282 debug_file = stderr;
2288 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2294 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2295 option to the specified value. This form uses long names. We need to handle
2296 -O option=value and -Ooption=value. */
2303 fprintf(stderr, "exim: string expected after -O\n");
2311 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2314 if (*argrest == 'A')
2316 alias_arg = argrest + 1;
2317 if (alias_arg[0] == 0)
2319 if (i+1 < argc) alias_arg = argv[++i]; else
2321 fprintf(stderr, "exim: string expected after -oA\n");
2327 /* -oB: Set a connection message max value for remote deliveries */
2329 else if (*argrest == 'B')
2331 uschar *p = argrest + 1;
2334 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2336 connection_max_messages = 1;
2345 fprintf(stderr, "exim: number expected after -oB\n");
2348 connection_max_messages = Uatoi(p);
2352 /* -odb: background delivery */
2354 else if (Ustrcmp(argrest, "db") == 0)
2356 synchronous_delivery = FALSE;
2357 arg_queue_only = FALSE;
2358 queue_only_set = TRUE;
2361 /* -odf: foreground delivery (smail-compatible option); same effect as
2362 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2365 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2367 synchronous_delivery = TRUE;
2368 arg_queue_only = FALSE;
2369 queue_only_set = TRUE;
2372 /* -odq: queue only */
2374 else if (Ustrcmp(argrest, "dq") == 0)
2376 synchronous_delivery = FALSE;
2377 arg_queue_only = TRUE;
2378 queue_only_set = TRUE;
2381 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2382 but no remote delivery */
2384 else if (Ustrcmp(argrest, "dqs") == 0)
2387 arg_queue_only = FALSE;
2388 queue_only_set = TRUE;
2391 /* -oex: Sendmail error flags. As these are also accepted without the
2392 leading -o prefix, for compatibility with vacation and other callers,
2393 they are handled with -e above. */
2395 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2396 -oitrue: Another sendmail syntax for the same */
2398 else if (Ustrcmp(argrest, "i") == 0 ||
2399 Ustrcmp(argrest, "itrue") == 0)
2402 /* -oM*: Set various characteristics for an incoming message; actually
2403 acted on for trusted callers only. */
2405 else if (*argrest == 'M')
2409 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2413 /* -oMa: Set sender host address */
2415 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2417 /* -oMaa: Set authenticator name */
2419 else if (Ustrcmp(argrest, "Maa") == 0)
2420 sender_host_authenticated = argv[++i];
2422 /* -oMas: setting authenticated sender */
2424 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2426 /* -oMai: setting authenticated id */
2428 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2430 /* -oMi: Set incoming interface address */
2432 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2434 /* -oMr: Received protocol */
2436 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2438 /* -oMs: Set sender host name */
2440 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2442 /* -oMt: Set sender ident */
2444 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2446 /* Else a bad argument */
2455 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2456 seem to call this as -m (undocumented), so that is also accepted (see
2459 else if (Ustrcmp(argrest, "m") == 0) {}
2461 /* -oo: An ancient flag for old-style addresses which still seems to
2462 crop up in some calls (see in SCO). */
2464 else if (Ustrcmp(argrest, "o") == 0) {}
2466 /* -oP <name>: set pid file path for daemon */
2468 else if (Ustrcmp(argrest, "P") == 0)
2469 override_pid_file_path = argv[++i];
2471 /* -or <n>: set timeout for non-SMTP acceptance
2472 -os <n>: set timeout for SMTP acceptance */
2474 else if (*argrest == 'r' || *argrest == 's')
2476 int *tp = (*argrest == 'r')?
2477 &arg_receive_timeout : &arg_smtp_receive_timeout;
2478 if (argrest[1] == 0)
2480 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2482 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2485 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2490 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2492 else if (Ustrcmp(argrest, "X") == 0)
2493 override_local_interfaces = argv[++i];
2495 /* Unknown -o argument */
2501 /* -ps: force Perl startup; -pd force delayed Perl startup */
2505 if (*argrest == 's' && argrest[1] == 0)
2507 perl_start_option = 1;
2510 if (*argrest == 'd' && argrest[1] == 0)
2512 perl_start_option = -1;
2517 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2518 which sets the host protocol and host name */
2522 if (i+1 < argc) argrest = argv[++i]; else
2523 { badarg = TRUE; break; }
2528 uschar *hn = Ustrchr(argrest, ':');
2531 received_protocol = argrest;
2535 received_protocol = string_copyn(argrest, hn - argrest);
2536 sender_host_name = hn + 1;
2543 receiving_message = FALSE;
2545 /* -qq...: Do queue runs in a 2-stage manner */
2547 if (*argrest == 'q')
2549 queue_2stage = TRUE;
2553 /* -qi...: Do only first (initial) deliveries */
2555 if (*argrest == 'i')
2557 queue_run_first_delivery = TRUE;
2561 /* -qf...: Run the queue, forcing deliveries
2562 -qff..: Ditto, forcing thawing as well */
2564 if (*argrest == 'f')
2566 queue_run_force = TRUE;
2567 if (*(++argrest) == 'f')
2569 deliver_force_thaw = TRUE;
2574 /* -q[f][f]l...: Run the queue only on local deliveries */
2576 if (*argrest == 'l')
2578 queue_run_local = TRUE;
2582 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2583 optionally starting from a given message id. */
2585 if (*argrest == 0 &&
2586 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2589 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2590 start_queue_run_id = argv[++i];
2591 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2592 stop_queue_run_id = argv[++i];
2595 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2596 optionally local only. */
2601 queue_interval = readconf_readtime(argrest, 0, FALSE);
2603 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2604 if (queue_interval <= 0)
2606 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2613 case 'R': /* Synonymous with -qR... */
2614 receiving_message = FALSE;
2616 /* -Rf: As -R (below) but force all deliveries,
2617 -Rff: Ditto, but also thaw all frozen messages,
2618 -Rr: String is regex
2619 -Rrf: Regex and force
2620 -Rrff: Regex and force and thaw
2622 in all cases provided there are no further characters in this
2628 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2630 if (Ustrcmp(argrest, rsopts[i]) == 0)
2632 if (i != 2) queue_run_force = TRUE;
2633 if (i >= 2) deliver_selectstring_regex = TRUE;
2634 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2635 argrest += Ustrlen(rsopts[i]);
2640 /* -R: Set string to match in addresses for forced queue run to
2641 pick out particular messages. */
2645 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2647 fprintf(stderr, "exim: string expected after -R\n");
2651 else deliver_selectstring = argrest;
2652 if (queue_interval < 0) queue_interval = 0;
2656 /* -r: an obsolete synonym for -f (see above) */
2659 /* -S: Like -R but works on sender. */
2661 case 'S': /* Synonymous with -qS... */
2662 receiving_message = FALSE;
2664 /* -Sf: As -S (below) but force all deliveries,
2665 -Sff: Ditto, but also thaw all frozen messages,
2666 -Sr: String is regex
2667 -Srf: Regex and force
2668 -Srff: Regex and force and thaw
2670 in all cases provided there are no further characters in this
2676 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2678 if (Ustrcmp(argrest, rsopts[i]) == 0)
2680 if (i != 2) queue_run_force = TRUE;
2681 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2682 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2683 argrest += Ustrlen(rsopts[i]);
2688 /* -S: Set string to match in addresses for forced queue run to
2689 pick out particular messages. */
2693 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2695 fprintf(stderr, "exim: string expected after -S\n");
2699 else deliver_selectstring_sender = argrest;
2700 if (queue_interval < 0) queue_interval = 0;
2703 /* -Tqt is an option that is exclusively for use by the testing suite.
2704 It is not recognized in other circumstances. It allows for the setting up
2705 of explicit "queue times" so that various warning/retry things can be
2706 tested. Otherwise variability of clock ticks etc. cause problems. */
2709 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2710 fudged_queue_times = argv[++i];
2715 /* -t: Set flag to extract recipients from body of message. */
2718 if (*argrest == 0) extract_recipients = TRUE;
2720 /* -ti: Set flag to extract recipients from body of message, and also
2721 specify that dot does not end the message. */
2723 else if (Ustrcmp(argrest, "i") == 0)
2725 extract_recipients = TRUE;
2729 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2732 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2739 /* -U: This means "initial user submission" in sendmail, apparently. The
2740 doc claims that in future sendmail may refuse syntactically invalid
2741 messages instead of fixing them. For the moment, we just ignore it. */
2747 /* -v: verify things - this is a very low-level debugging */
2752 debug_selector |= D_v;
2753 debug_file = stderr;
2759 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2761 The -x flag tells the sendmail command that mail from a local
2762 mail program has National Language Support (NLS) extended characters
2763 in the body of the mail item. The sendmail command can send mail with
2764 extended NLS characters across networks that normally corrupts these
2767 As Exim is 8-bit clean, it just ignores this flag. */
2770 if (*argrest != 0) badarg = TRUE;
2773 /* All other initial characters are errors */
2778 } /* End of high-level switch statement */
2780 /* Failed to recognize the option, or syntax error */
2784 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2785 "option %s\n", arg);
2791 /* Arguments have been processed. Check for incompatibilities. */
2795 (smtp_input || extract_recipients || recipients_arg < argc) &&
2796 (daemon_listen || queue_interval >= 0 || bi_option ||
2797 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2798 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2801 msg_action_arg > 0 &&
2802 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2803 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2806 (daemon_listen || queue_interval >= 0) &&
2807 (sender_address != NULL || list_options || list_queue || checking ||
2811 daemon_listen && queue_interval == 0
2815 (checking || smtp_input || extract_recipients ||
2816 filter_test != FTEST_NONE || bi_option)
2819 verify_address_mode &&
2820 (address_test_mode || smtp_input || extract_recipients ||
2821 filter_test != FTEST_NONE || bi_option)
2824 address_test_mode && (smtp_input || extract_recipients ||
2825 filter_test != FTEST_NONE || bi_option)
2828 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2832 deliver_selectstring != NULL && queue_interval < 0
2836 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2840 /* If debugging is set up, set the file and the file descriptor to pass on to
2841 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2842 to run in the foreground. */
2844 if (debug_selector != 0)
2846 debug_file = stderr;
2847 debug_fd = fileno(debug_file);
2848 background_daemon = FALSE;
2849 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2850 if (debug_selector != D_v) /* -v only doesn't show this */
2852 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2853 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2855 show_whats_supported(stderr);
2859 /* When started with root privilege, ensure that the limits on the number of
2860 open files and the number of processes (where that is accessible) are
2861 sufficiently large, or are unset, in case Exim has been called from an
2862 environment where the limits are screwed down. Not all OS have the ability to
2863 change some of these limits. */
2867 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2873 #ifdef RLIMIT_NOFILE
2874 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2876 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2878 rlp.rlim_cur = rlp.rlim_max = 0;
2881 /* I originally chose 1000 as a nice big number that was unlikely to
2882 be exceeded. It turns out that some older OS have a fixed upper limit of
2885 if (rlp.rlim_cur < 1000)
2887 rlp.rlim_cur = rlp.rlim_max = 1000;
2888 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2890 rlp.rlim_cur = rlp.rlim_max = 256;
2891 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2892 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2899 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2901 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2903 rlp.rlim_cur = rlp.rlim_max = 0;
2906 #ifdef RLIM_INFINITY
2907 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2909 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2911 if (rlp.rlim_cur < 1000)
2913 rlp.rlim_cur = rlp.rlim_max = 1000;
2915 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2916 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2922 /* Exim is normally entered as root (but some special configurations are
2923 possible that don't do this). However, it always spins off sub-processes that
2924 set their uid and gid as required for local delivery. We don't want to pass on
2925 any extra groups that root may belong to, so we want to get rid of them all at
2928 We need to obey setgroups() at this stage, before possibly giving up root
2929 privilege for a changed configuration file, but later on we might need to
2930 check on the additional groups for the admin user privilege - can't do that
2931 till after reading the config, which might specify the exim gid. Therefore,
2932 save the group list here first. */
2934 group_count = getgroups(NGROUPS_MAX, group_list);
2936 /* There is a fundamental difference in some BSD systems in the matter of
2937 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2938 known not to be different. On the "different" systems there is a single group
2939 list, and the first entry in it is the current group. On all other versions of
2940 Unix there is a supplementary group list, which is in *addition* to the current
2941 group. Consequently, to get rid of all extraneous groups on a "standard" system
2942 you pass over 0 groups to setgroups(), while on a "different" system you pass
2943 over a single group - the current group, which is always the first group in the
2944 list. Calling setgroups() with zero groups on a "different" system results in
2945 an error return. The following code should cope with both types of system.
2947 However, if this process isn't running as root, setgroups() can't be used
2948 since you have to be root to run it, even if throwing away groups. Not being
2949 root here happens only in some unusual configurations. We just ignore the
2952 if (setgroups(0, NULL) != 0)
2954 if (setgroups(1, group_list) != 0 && !unprivileged)
2956 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2961 /* If the configuration file name has been altered by an argument on the
2962 command line (either a new file name or a macro definition) and the caller is
2963 not root or the exim user, or if this is a filter testing run, remove any
2964 setuid privilege the program has, and run as the underlying user.
2966 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2967 severely restricts the use of -C for some purposes.
2969 Otherwise, set the real ids to the effective values (should be root unless run
2970 from inetd, which it can either be root or the exim uid, if one is configured).
2972 There is a private mechanism for bypassing some of this, in order to make it
2973 possible to test lots of configurations automatically, without having either to
2974 recompile each time, or to patch in an actual configuration file name and other
2975 values (such as the path name). If running in the test harness, pretend that
2976 configuration file changes and macro definitions haven't happened. */
2979 (config_changed || macros != NULL) && /* Config changed, and */
2980 real_uid != root_uid && /* Not root, and */
2981 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2982 real_uid != exim_uid && /* Not exim, and */
2984 !running_in_test_harness /* Not fudged */
2986 expansion_test /* expansion testing */
2988 filter_test != FTEST_NONE) /* Filter testing */
2990 setgroups(group_count, group_list);
2991 exim_setugid(real_uid, real_gid, FALSE,
2992 US"-C, -D, -be or -bf forces real uid");
2993 removed_privilege = TRUE;
2995 /* In the normal case when Exim is called like this, stderr is available
2996 and should be used for any logging information because attempts to write
2997 to the log will usually fail. To arrange this, we unset really_exim. However,
2998 if no stderr is available there is no point - we might as well have a go
2999 at the log (if it fails, syslog will be written). */
3001 if (log_stderr != NULL) really_exim = FALSE;
3004 /* Privilege is to be retained for the moment. It may be dropped later,
3005 depending on the job that this Exim process has been asked to do. For now, set
3006 the real uid to the effective so that subsequent re-execs of Exim are done by a
3009 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3011 /* If testing a filter, open the file(s) now, before wasting time doing other
3012 setups and reading the message. */
3014 if ((filter_test & FTEST_SYSTEM) != 0)
3016 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3019 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3021 return EXIT_FAILURE;
3025 if ((filter_test & FTEST_USER) != 0)
3027 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3030 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3032 return EXIT_FAILURE;
3036 /* Read the main runtime configuration data; this gives up if there
3037 is a failure. It leaves the configuration file open so that the subsequent
3038 configuration data for delivery can be read if needed. */
3042 /* Handle the decoding of logging options. */
3044 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3045 log_options, log_options_count, US"log");
3049 debug_printf("configuration file is %s\n", config_main_filename);
3050 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3051 log_extra_selector);
3054 /* If domain literals are not allowed, check the sender address that was
3055 supplied with -f. Ditto for a stripped trailing dot. */
3057 if (sender_address != NULL)
3059 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3061 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3062 "allowed\n", sender_address);
3063 return EXIT_FAILURE;
3065 if (f_end_dot && !strip_trailing_dot)
3067 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3068 "(trailing dot not allowed)\n", sender_address);
3069 return EXIT_FAILURE;
3073 /* Paranoia check of maximum lengths of certain strings. There is a check
3074 on the length of the log file path in log.c, which will come into effect
3075 if there are any calls to write the log earlier than this. However, if we
3076 get this far but the string is very long, it is better to stop now than to
3077 carry on and (e.g.) receive a message and then have to collapse. The call to
3078 log_write() from here will cause the ultimate panic collapse if the complete
3079 file name exceeds the buffer length. */
3081 if (Ustrlen(log_file_path) > 200)
3082 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3083 "log_file_path is longer than 200 chars: aborting");
3085 if (Ustrlen(pid_file_path) > 200)
3086 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3087 "pid_file_path is longer than 200 chars: aborting");
3089 if (Ustrlen(spool_directory) > 200)
3090 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3091 "spool_directory is longer than 200 chars: aborting");
3093 /* Length check on the process name given to syslog for its TAG field,
3094 which is only permitted to be 32 characters or less. See RFC 3164. */
3096 if (Ustrlen(syslog_processname) > 32)
3097 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3098 "syslog_processname is longer than 32 chars: aborting");
3100 /* In some operating systems, the environment variable TMPDIR controls where
3101 temporary files are created; Exim doesn't use these (apart from when delivering
3102 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3103 If TMPDIR is found in the environment, reset it to the value defined in the
3104 TMPDIR macro, if this macro is defined. */
3109 for (p = USS environ; *p != NULL; p++)
3111 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3112 Ustrcmp(*p+7, TMPDIR) != 0)
3114 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3115 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3117 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3123 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3124 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3125 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3126 called by a user who has set the TZ variable. This then affects the timestamps
3127 in log files and in Received: headers, and any created Date: header lines. The
3128 required timezone is settable in the configuration file, so nothing can be done
3129 about this earlier - but hopefully nothing will normally be logged earlier than
3130 this. We have to make a new environment if TZ is wrong, but don't bother if
3131 timestamps_utc is set, because then all times are in UTC anyway. */
3133 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3135 timestamps_utc = TRUE;
3139 uschar *envtz = US getenv("TZ");
3140 if ((envtz == NULL && timezone_string != NULL) ||
3142 (timezone_string == NULL ||
3143 Ustrcmp(timezone_string, envtz) != 0)))
3145 uschar **p = USS environ;
3149 while (*p++ != NULL) count++;
3150 if (envtz == NULL) count++;
3151 newp = new = malloc(sizeof(uschar *) * (count + 1));
3152 for (p = USS environ; *p != NULL; p++)
3154 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3157 if (timezone_string != NULL)
3159 *newp = malloc(Ustrlen(timezone_string) + 4);
3160 sprintf(CS *newp++, "TZ=%s", timezone_string);
3165 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3166 tod_stamp(tod_log));
3170 /* Handle the case when we have removed the setuid privilege because of -C or
3171 -D. This means that the caller of Exim was not root, and, provided that
3172 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3175 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3176 were running as the exim user defined in the configuration file (different to
3177 the one in the binary). The sysadmin may expect this case to retain privilege
3178 because "the binary was called by the Exim user", but it hasn't, because of the
3179 order in which it handles this stuff. There are two possibilities:
3181 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3182 to do message deliveries. Thus, the fact that it is running as a
3183 non-privileged user is plausible, and might be wanted in some special
3184 configurations. However, really_exim will have been set false when
3185 privilege was dropped, to stop Exim trying to write to its normal log
3186 files. Therefore, re-enable normal log processing, assuming the sysadmin
3187 has set up the log directory correctly.
3189 (2) If deliver_drop_privilege is not set, the configuration won't work as
3190 apparently intended, and so we log a panic message. In order to retain
3191 root for -C or -D, the caller must either be root or the Exim user
3192 defined in the binary (when deliver_drop_ privilege is false).
3194 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3195 built-in exim user or one defined in the configuration. In either event,
3196 re-enable log processing, assuming the sysadmin knows what they are doing. */
3198 if (removed_privilege && (config_changed || macros != NULL) &&
3199 real_uid == exim_uid)
3201 #ifdef ALT_CONFIG_ROOT_ONLY
3202 really_exim = TRUE; /* let logging work normally */
3205 if (deliver_drop_privilege)
3206 really_exim = TRUE; /* let logging work normally */
3208 log_write(0, LOG_MAIN|LOG_PANIC,
3209 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3210 (int)exim_uid, config_changed? "-C" : "-D");
3214 /* Start up Perl interpreter if Perl support is configured and there is a
3215 perl_startup option, and the configuration or the command line specifies
3216 initializing starting. Note that the global variables are actually called
3217 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3220 if (perl_start_option != 0)
3221 opt_perl_at_start = (perl_start_option > 0);
3222 if (opt_perl_at_start && opt_perl_startup != NULL)
3225 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3226 errstr = init_perl(opt_perl_startup);
3229 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3230 return EXIT_FAILURE;
3232 opt_perl_started = TRUE;
3234 #endif /* EXIM_PERL */
3236 /* Log the arguments of the call if the configuration file said so. This is
3237 a debugging feature for finding out what arguments certain MUAs actually use.
3238 Don't attempt it if logging is disabled, or if listing variables or if
3239 verifying/testing addresses or expansions. */
3241 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3242 && really_exim && !list_options && !checking)
3245 uschar *p = big_buffer;
3247 (void)getcwd(CS p+4, big_buffer_size - 4);
3249 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3251 for (i = 0; i < argc; i++)
3253 int len = Ustrlen(argv[i]);
3256 if (p + len + 8 >= big_buffer + big_buffer_size)
3259 log_write(0, LOG_MAIN, "%s", big_buffer);
3260 Ustrcpy(big_buffer, "...");
3263 printing = string_printing(argv[i]);
3264 if (printing[0] == 0) quote = US"\""; else
3266 uschar *pp = printing;
3268 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3270 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3271 (p - big_buffer) - 4), printing, quote);
3275 if ((log_extra_selector & LX_arguments) != 0)
3276 log_write(0, LOG_MAIN, "%s", big_buffer);
3278 debug_printf("%s\n", big_buffer);
3281 /* Set the working directory to be the top-level spool directory. We don't rely
3282 on this in the code, which always uses fully qualified names, but it's useful
3283 for core dumps etc. Don't complain if it fails - the spool directory might not
3284 be generally accessible and calls with the -C option (and others) have lost
3285 privilege by now. */
3287 if (Uchdir(spool_directory) != 0)
3289 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3290 (void)Uchdir(spool_directory);
3293 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3294 alias file. Exim doesn't have such a concept, but this call is screwed into
3295 Sun's YP makefiles. Handle this by calling a configured script, as the real
3296 user who called Exim. The -oA option can be used to pass an argument to the
3301 fclose(config_file);
3302 if (bi_command != NULL)
3306 argv[i++] = bi_command;
3307 if (alias_arg != NULL) argv[i++] = alias_arg;
3310 setgroups(group_count, group_list);
3311 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3313 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3314 (argv[1] == NULL)? US"" : argv[1]);
3316 execv(CS argv[0], (char *const *)argv);
3317 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3322 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3327 /* If an action on specific messages is requested, or if a daemon or queue
3328 runner is being started, we need to know if Exim was called by an admin user.
3329 This is the case if the real user is root or exim, or if the real group is
3330 exim, or if one of the supplementary groups is exim or a group listed in
3331 admin_groups. We don't fail all message actions immediately if not admin_user,
3332 since some actions can be performed by non-admin users. Instead, set admin_user
3333 for later interrogation. */
3335 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3341 for (i = 0; i < group_count; i++)
3343 if (group_list[i] == exim_gid) admin_user = TRUE;
3344 else if (admin_groups != NULL)
3346 for (j = 1; j <= (int)(admin_groups[0]); j++)
3347 if (admin_groups[j] == group_list[i])
3348 { admin_user = TRUE; break; }
3350 if (admin_user) break;
3354 /* Another group of privileged users are the trusted users. These are root,
3355 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3356 are permitted to specify sender_addresses with -f on the command line, and
3357 other message parameters as well. */
3359 if (real_uid == root_uid || real_uid == exim_uid)
3360 trusted_caller = TRUE;
3365 if (trusted_users != NULL)
3367 for (i = 1; i <= (int)(trusted_users[0]); i++)
3368 if (trusted_users[i] == real_uid)
3369 { trusted_caller = TRUE; break; }
3372 if (!trusted_caller && trusted_groups != NULL)
3374 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3376 if (trusted_groups[i] == real_gid)
3377 trusted_caller = TRUE;
3378 else for (j = 0; j < group_count; j++)
3380 if (trusted_groups[i] == group_list[j])
3381 { trusted_caller = TRUE; break; }
3383 if (trusted_caller) break;
3388 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3389 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3391 /* Only an admin user may start the daemon or force a queue run in the default
3392 configuration, but the queue run restriction can be relaxed. Only an admin
3393 user may request that a message be returned to its sender forthwith. Only an
3394 admin user may specify a debug level greater than D_v (because it might show
3395 passwords, etc. in lookup queries). Only an admin user may request a queue
3400 BOOL debugset = (debug_selector & ~D_v) != 0;
3401 if (deliver_give_up || daemon_listen ||
3402 (count_queue && queue_list_requires_admin) ||
3403 (list_queue && queue_list_requires_admin) ||
3404 (queue_interval >= 0 && prod_requires_admin) ||
3405 (debugset && !running_in_test_harness))
3407 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3412 /* If the real user is not root or the exim uid, the argument for passing
3413 in an open TCP/IP connection for another message is not permitted, nor is
3414 running with the -N option for any delivery action, unless this call to exim is
3415 one that supplied an input message, or we are using a patched exim for
3416 regression testing. */
3418 if (real_uid != root_uid && real_uid != exim_uid &&
3419 (continue_hostname != NULL ||
3421 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3422 )) && !running_in_test_harness)
3424 fprintf(stderr, "exim: Permission denied\n");
3425 return EXIT_FAILURE;
3428 /* If the caller is not trusted, certain arguments are ignored when running for
3429 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3430 Note that authority for performing certain actions on messages is tested in the
3431 queue_action() function. */
3433 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3435 sender_host_name = sender_host_address = interface_address =
3436 sender_ident = received_protocol = NULL;
3437 sender_host_port = interface_port = 0;
3438 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3441 /* If a sender host address is set, extract the optional port number off the
3442 end of it and check its syntax. Do the same thing for the interface address.
3443 Exim exits if the syntax is bad. */
3447 if (sender_host_address != NULL)
3448 sender_host_port = check_port(sender_host_address);
3449 if (interface_address != NULL)
3450 interface_port = check_port(interface_address);
3453 /* If an SMTP message is being received check to see if the standard input is a
3454 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3455 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3460 union sockaddr_46 inetd_sock;
3461 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3462 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3464 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3465 if (family == AF_INET || family == AF_INET6)
3467 union sockaddr_46 interface_sock;
3468 size = sizeof(interface_sock);
3470 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3471 interface_address = host_ntoa(-1, &interface_sock, NULL,
3474 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3476 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3479 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3480 NULL, &sender_host_port);
3481 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3482 "inetd is not supported when mua_wrapper is set");
3487 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3488 return EXIT_FAILURE;
3494 /* If the load average is going to be needed while receiving a message, get it
3495 now for those OS that require the first call to os_getloadavg() to be done as
3496 root. There will be further calls later for each message received. */
3498 #ifdef LOAD_AVG_NEEDS_ROOT
3499 if (receiving_message &&
3500 (queue_only_load >= 0 ||
3501 (is_inetd && smtp_load_reserve >= 0)
3504 load_average = os_getloadavg();
3508 /* The queue_only configuration option can be overridden by -odx on the command
3509 line, except that if queue_only_override is false, queue_only cannot be unset
3510 from the command line. */
3512 if (queue_only_set && (queue_only_override || arg_queue_only))
3513 queue_only = arg_queue_only;
3515 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3518 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3519 if (arg_smtp_receive_timeout >= 0)
3520 smtp_receive_timeout = arg_smtp_receive_timeout;
3522 /* If Exim was started with root privilege, unless we have already removed the
3523 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3524 except when starting the daemon or doing some kind of delivery or address
3525 testing (-bt). These are the only cases when root need to be retained. We run
3526 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3527 retained only for starting the daemon. */
3529 if (!unprivileged && /* originally had root AND */
3530 !removed_privilege && /* still got root AND */
3531 !daemon_listen && /* not starting the daemon */
3532 queue_interval <= 0 && /* (either kind of daemon) */
3534 deliver_drop_privilege || /* requested unprivileged */
3536 queue_interval < 0 && /* not running the queue */
3537 (msg_action_arg < 0 || /* and */
3538 msg_action != MSG_DELIVER) && /* not delivering and */
3539 (!checking || !address_test_mode) /* not address checking */
3543 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3546 /* When we are retaining a privileged uid, we still change to the exim gid. */
3548 else setgid(exim_gid);
3550 /* Handle a request to list the delivery queue */
3554 set_process_info("listing the queue");
3555 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3559 /* Handle a request to count the delivery queue */
3563 set_process_info("counting the queue");
3568 /* Handle actions on specific messages, except for the force delivery action,
3569 which is done below. Some actions take a whole list of message ids, which
3570 are known to continue up to the end of the arguments. Others take a single
3571 message id and then operate on the recipients list. */
3573 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3575 int yield = EXIT_SUCCESS;
3576 set_process_info("acting on specified messages");
3578 if (!one_msg_action)
3580 for (i = msg_action_arg; i < argc; i++)
3581 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3582 yield = EXIT_FAILURE;
3585 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3586 recipients_arg)) yield = EXIT_FAILURE;
3590 /* All the modes below here require the remaining configuration sections
3591 to be read, except that we can skip over the ACL setting when delivering
3592 specific messages, or doing a queue run. (For various testing cases we could
3593 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3596 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3598 /* The configuration data will have been read into POOL_PERM because we won't
3599 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3600 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3601 configuration were read into POOL_MAIN, because we don't do any resets till
3602 later on. However, it seems right, and it does ensure that both pools get used.
3605 store_pool = POOL_MAIN;
3607 /* Handle the -brt option. This is for checking out retry configurations.
3608 The next three arguments are a domain name or a complete address, and
3609 optionally two error numbers. All it does is to call the function that
3610 scans the retry configuration data. */
3612 if (test_retry_arg >= 0)
3614 retry_config *yield;
3615 int basic_errno = 0;
3619 if (test_retry_arg >= argc)
3621 printf("-brt needs a domain or address argument\n");
3622 exim_exit(EXIT_FAILURE);
3624 s1 = argv[test_retry_arg++];
3627 /* If the first argument contains no @ and no . it might be a local user
3628 or it might be a single-component name. Treat as a domain. */
3630 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3632 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3633 "being \ntreated as a one-component domain, not as a local part.\n\n",
3637 /* There may be an optional second domain arg. */
3639 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3640 s2 = argv[test_retry_arg++];
3642 /* The final arg is an error name */
3644 if (test_retry_arg < argc)
3646 uschar *ss = argv[test_retry_arg];
3648 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3651 printf("%s\n", CS error);
3652 return EXIT_FAILURE;
3655 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3656 an error is for matching codes to the decade. Turn them into a real error
3657 code, off the decade. */
3659 if (basic_errno == ERRNO_RCPT4XX)
3661 int code = (more_errno >> 8) & 255;
3663 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3664 else if (code > 100)
3665 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3669 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3670 if (yield == NULL) printf("No retry information found\n"); else
3673 more_errno = yield->more_errno;
3674 printf("Retry rule: %s ", yield->pattern);
3676 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3678 printf("quota%s%s ",
3679 (more_errno > 0)? "_" : "",
3680 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3682 else if (yield->basic_errno == ECONNREFUSED)
3684 printf("refused%s%s ",
3685 (more_errno > 0)? "_" : "",
3686 (more_errno == 'M')? "MX" :
3687 (more_errno == 'A')? "A" : "");
3689 else if (yield->basic_errno == ETIMEDOUT)
3692 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3694 if (more_errno != 0) printf("_%s",
3695 (more_errno == 'M')? "MX" : "A");
3698 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3699 printf("auth_failed ");
3702 for (r = yield->rules; r != NULL; r = r->next)
3704 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3705 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3711 printf(",%d.", x/1000);
3725 exim_exit(EXIT_SUCCESS);
3728 /* Handle a request to list one or more configuration options */
3732 set_process_info("listing variables");
3733 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3734 else for (i = recipients_arg; i < argc; i++)
3737 (Ustrcmp(argv[i], "router") == 0 ||
3738 Ustrcmp(argv[i], "transport") == 0 ||
3739 Ustrcmp(argv[i], "authenticator") == 0))
3741 readconf_print(argv[i+1], argv[i]);
3744 else readconf_print(argv[i], NULL);
3746 exim_exit(EXIT_SUCCESS);
3750 /* Handle a request to deliver one or more messages that are already on the
3751 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3752 is typically used for a small number when prodding by hand (when the option
3753 forced_delivery will be set) or when re-execing to regain root privilege.
3754 Each message delivery must happen in a separate process, so we fork a process
3755 for each one, and run them sequentially so that debugging output doesn't get
3756 intertwined, and to avoid spawning too many processes if a long list is given.
3757 However, don't fork for the last one; this saves a process in the common case
3758 when Exim is called to deliver just one message. */
3760 if (msg_action_arg > 0)
3762 if (prod_requires_admin && !admin_user)
3764 fprintf(stderr, "exim: Permission denied\n");
3765 exim_exit(EXIT_FAILURE);
3767 set_process_info("delivering specified messages");
3768 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3769 for (i = msg_action_arg; i < argc; i++)
3774 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3775 else if ((pid = fork()) == 0)
3777 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3778 _exit(EXIT_SUCCESS);
3782 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3784 exim_exit(EXIT_FAILURE);
3788 exim_exit(EXIT_SUCCESS);
3792 /* If only a single queue run is requested, without SMTP listening, we can just
3793 turn into a queue runner, with an optional starting message id. */
3795 if (queue_interval == 0 && !daemon_listen)
3797 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3798 (start_queue_run_id == NULL)? US"" : US" starting at ",
3799 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3800 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3801 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3802 set_process_info("running the queue (single queue run)");
3803 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3804 exim_exit(EXIT_SUCCESS);
3808 /* Find the login name of the real user running this process. This is always
3809 needed when receiving a message, because it is written into the spool file. It
3810 may also be used to construct a from: or a sender: header, and in this case we
3811 need the user's full name as well, so save a copy of it, checked for RFC822
3812 syntax and munged if necessary, if it hasn't previously been set by the -F
3813 argument. We may try to get the passwd entry more than once, in case NIS or
3814 other delays are in evidence. Save the home directory for use in filter testing
3819 if ((pw = getpwuid(real_uid)) != NULL)
3821 originator_login = string_copy(US pw->pw_name);
3822 originator_home = string_copy(US pw->pw_dir);
3824 /* If user name has not been set by -F, set it from the passwd entry
3825 unless -f has been used to set the sender address by a trusted user. */
3827 if (originator_name == NULL)
3829 if (sender_address == NULL ||
3830 (!trusted_caller && filter_test == FTEST_NONE))
3832 uschar *name = US pw->pw_gecos;
3833 uschar *amp = Ustrchr(name, '&');
3836 /* Most Unix specify that a '&' character in the gecos field is
3837 replaced by a copy of the login name, and some even specify that
3838 the first character should be upper cased, so that's what we do. */
3843 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3844 amp - name, name, &loffset, originator_login, amp + 1);
3845 buffer[loffset] = toupper(buffer[loffset]);
3849 /* If a pattern for matching the gecos field was supplied, apply
3850 it and then expand the name string. */
3852 if (gecos_pattern != NULL && gecos_name != NULL)
3855 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3857 if (regex_match_and_setup(re, name, 0, -1))
3859 uschar *new_name = expand_string(gecos_name);
3861 if (new_name != NULL)
3863 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3864 "gecos field \"%s\"\n", new_name, name);
3867 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3868 "\"%s\": %s\n", gecos_name, expand_string_message);
3870 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3871 "gecos field \"%s\"\n", gecos_pattern, name);
3872 store_free((void *)re);
3874 originator_name = string_copy(name);
3877 /* A trusted caller has used -f but not -F */
3879 else originator_name = US"";
3882 /* Break the retry loop */
3887 if (++i > finduser_retries) break;
3891 /* If we cannot get a user login, log the incident and give up, unless the
3892 configuration specifies something to use. When running in the test harness,
3893 any setting of unknown_login overrides the actual login name. */
3895 if (originator_login == NULL || running_in_test_harness)
3897 if (unknown_login != NULL)
3899 originator_login = expand_string(unknown_login);
3900 if (originator_name == NULL && unknown_username != NULL)
3901 originator_name = expand_string(unknown_username);
3902 if (originator_name == NULL) originator_name = US"";
3904 if (originator_login == NULL)
3905 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3909 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3912 originator_name = string_copy(parse_fix_phrase(originator_name,
3913 Ustrlen(originator_name), big_buffer, big_buffer_size));
3915 /* If a message is created by this call of Exim, the uid/gid of its originator
3916 are those of the caller. These values are overridden if an existing message is
3917 read in from the spool. */
3919 originator_uid = real_uid;
3920 originator_gid = real_gid;
3922 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3923 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3925 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3926 returns. We leave this till here so that the originator_ fields are available
3927 for incoming messages via the daemon. */
3929 if (daemon_listen || queue_interval > 0)
3931 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3932 "run when mua_wrapper is set");
3936 /* If the sender ident has not been set (by a trusted caller) set it to
3937 the caller. This will get overwritten below for an inetd call. If a trusted
3938 caller has set it empty, unset it. */
3940 if (sender_ident == NULL) sender_ident = originator_login;
3941 else if (sender_ident[0] == 0) sender_ident = NULL;
3943 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3944 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3945 originator_* variables set. */
3947 if (test_rewrite_arg >= 0)
3949 really_exim = FALSE;
3950 if (test_rewrite_arg >= argc)
3952 printf("-brw needs an address argument\n");
3953 exim_exit(EXIT_FAILURE);
3955 rewrite_test(argv[test_rewrite_arg]);
3956 exim_exit(EXIT_SUCCESS);
3959 /* A locally-supplied message is considered to be coming from a local user
3960 unless a trusted caller supplies a sender address with -f, or is passing in the
3961 message via SMTP (inetd invocation or otherwise). */
3963 if ((sender_address == NULL && !smtp_input) ||
3964 (!trusted_caller && filter_test == FTEST_NONE))
3966 sender_local = TRUE;
3968 /* A trusted caller can supply authenticated_sender and authenticated_id
3969 via -oMas and -oMai and if so, they will already be set. */
3971 if (authenticated_sender == NULL)
3972 authenticated_sender = string_sprintf("%s@%s", originator_login,
3973 qualify_domain_sender);
3974 if (authenticated_id == NULL) authenticated_id = originator_login;
3977 /* Trusted callers are always permitted to specify the sender address.
3978 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3979 is specified is the empty address. However, if a trusted caller does not
3980 specify a sender address for SMTP input, we leave sender_address unset. This
3981 causes the MAIL commands to be honoured. */
3983 if ((!smtp_input && sender_address == NULL) ||
3984 !receive_check_set_sender(sender_address))
3986 /* Either the caller is not permitted to set a general sender, or this is
3987 non-SMTP input and the trusted caller has not set a sender. If there is no
3988 sender, or if a sender other than <> is set, override with the originator's
3989 login (which will get qualified below), except when checking things. */
3991 if (sender_address == NULL /* No sender_address set */
3993 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3994 !checking && /* Not running tests, AND */
3995 filter_test == FTEST_NONE)) /* Not testing a filter */
3997 sender_address = originator_login;
3998 sender_address_forced = FALSE;
3999 sender_address_domain = 0;
4003 /* Remember whether an untrusted caller set the sender address */
4005 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4007 /* Ensure that the sender address is fully qualified unless it is the empty
4008 address, which indicates an error message, or doesn't exist (root caller, smtp
4009 interface, no -f argument). */
4011 if (sender_address != NULL && sender_address[0] != 0 &&
4012 sender_address_domain == 0)
4013 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4014 qualify_domain_sender);
4016 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4018 /* Handle a request to verify a list of addresses, or test them for delivery.
4019 This must follow the setting of the sender address, since routers can be
4020 predicated upon the sender. If no arguments are given, read addresses from
4021 stdin. Set debug_level to at least D_v to get full output for address testing.
4024 if (verify_address_mode || address_test_mode)
4027 int flags = vopt_qualify;
4029 if (verify_address_mode)
4031 if (!verify_as_sender) flags |= vopt_is_recipient;
4032 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4037 flags |= vopt_is_recipient;
4038 debug_selector |= D_v;
4039 debug_file = stderr;
4040 debug_fd = fileno(debug_file);
4041 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4044 if (recipients_arg < argc)
4046 while (recipients_arg < argc)
4048 uschar *s = argv[recipients_arg++];
4051 BOOL finished = FALSE;
4052 uschar *ss = parse_find_address_end(s, FALSE);
4053 if (*ss == ',') *ss = 0; else finished = TRUE;
4054 test_address(s, flags, &exit_value);
4057 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4064 uschar *s = get_stdinput(NULL, NULL);
4065 if (s == NULL) break;
4066 test_address(s, flags, &exit_value);
4070 exim_exit(exit_value);
4073 /* Handle expansion checking */
4077 if (recipients_arg < argc)
4079 while (recipients_arg < argc)
4081 uschar *s = argv[recipients_arg++];
4082 uschar *ss = expand_string(s);
4084 printf ("Failed: %s\n", expand_string_message);
4085 else printf("%s\n", CS ss);
4093 char *(*fn_readline)(char *) = NULL;
4094 char *(*fn_addhist)(char *) = NULL;
4097 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4103 uschar *source = get_stdinput(fn_readline, fn_addhist);
4104 if (source == NULL) break;
4105 ss = expand_string(source);
4107 printf ("Failed: %s\n", expand_string_message);
4108 else printf("%s\n", CS ss);
4112 if (dlhandle != NULL) dlclose(dlhandle);
4116 exim_exit(EXIT_SUCCESS);
4120 /* The active host name is normally the primary host name, but it can be varied
4121 for hosts that want to play several parts at once. We need to ensure that it is
4122 set for host checking, and for receiving messages. */
4124 smtp_active_hostname = primary_hostname;
4125 if (raw_active_hostname != NULL)
4127 uschar *nah = expand_string(raw_active_hostname);
4130 if (!expand_string_forcedfail)
4131 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4132 "(smtp_active_hostname): %s", raw_active_hostname,
4133 expand_string_message);
4135 else if (nah[0] != 0) smtp_active_hostname = nah;
4138 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4139 given IP address so that the blocking and relay configuration can be tested. An
4140 RFC 1413 call is made only if we are running in the test harness and an
4141 incoming interface and both ports are specified, because there is no TCP/IP
4142 call to find the ident for. */
4149 sender_ident = NULL;
4150 if (running_in_test_harness && sender_host_port != 0 &&
4151 interface_address != NULL && interface_port != 0)
4152 verify_get_ident(1413);
4154 /* In case the given address is a non-canonical IPv6 address, canonicize
4155 it. The code works for both IPv4 and IPv6, as it happens. */
4157 size = host_aton(sender_host_address, x);
4158 sender_host_address = store_get(48); /* large enough for full IPv6 */
4159 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4161 /* Now set up for testing */
4163 host_build_sender_fullhost();
4167 sender_local = FALSE;
4168 sender_host_notsocket = TRUE;
4169 debug_file = stderr;
4170 debug_fd = fileno(debug_file);
4171 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4172 "**** but without any ident (RFC 1413) callback.\n"
4173 "**** This is not for real!\n\n",
4174 sender_host_address);
4176 if (verify_check_host(&hosts_connection_nolog) == OK)
4177 log_write_selector &= ~L_smtp_connection;
4178 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4180 if (smtp_start_session())
4182 reset_point = store_get(0);
4185 store_reset(reset_point);
4186 if (smtp_setup_msg() <= 0) break;
4187 if (!receive_msg(FALSE)) break;
4190 exim_exit(EXIT_SUCCESS);
4194 /* Arrange for message reception if recipients or SMTP were specified;
4195 otherwise complain unless a version print (-bV) happened or this is a filter
4196 verification test. In the former case, show the configuration file name. */
4198 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4200 if (version_printed)
4202 printf("Configuration file is %s\n", config_main_filename);
4203 return EXIT_SUCCESS;
4205 if (filter_test == FTEST_NONE)
4208 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4209 "not directly from a shell command line. Options and/or arguments control\n"
4210 "what it does when called. For a list of options, see the Exim documentation.\n");
4211 return EXIT_FAILURE;
4216 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4217 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4218 that we are not called from inetd, because that is rejected above. The
4219 following configuration settings are forced here:
4221 (1) Synchronous delivery (-odi)
4222 (2) Errors to stderr (-oep == -oeq)
4223 (3) No parallel remote delivery
4224 (4) Unprivileged delivery
4226 We don't force overall queueing options because there are several of them;
4227 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4228 to override any SMTP queueing. */
4232 synchronous_delivery = TRUE;
4233 arg_error_handling = ERRORS_STDERR;
4234 remote_max_parallel = 1;
4235 deliver_drop_privilege = TRUE;
4237 queue_smtp_domains = NULL;
4241 /* Prepare to accept one or more new messages on the standard input. When a
4242 message has been read, its id is returned in message_id[]. If doing immediate
4243 delivery, we fork a delivery process for each received message, except for the
4244 last one, where we can save a process switch.
4246 It is only in non-smtp mode that error_handling is allowed to be changed from
4247 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4248 sendmail error modes other than -oem ever actually used? Later: yes.) */
4250 if (!smtp_input) error_handling = arg_error_handling;
4252 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4253 logging being sent down the socket and make an identd call to get the
4259 exim_nullstd(); /* Re-open to /dev/null */
4260 verify_get_ident(IDENT_PORT);
4261 host_build_sender_fullhost();
4262 set_process_info("handling incoming connection from %s via inetd",
4266 /* If the sender host address has been set, build sender_fullhost if it hasn't
4267 already been done (which it will have been for inetd). This caters for the
4268 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4269 so that the test for IP options is skipped for -bs input. */
4271 if (sender_host_address != NULL && sender_fullhost == NULL)
4273 host_build_sender_fullhost();
4274 set_process_info("handling incoming connection from %s via -oMa",
4276 sender_host_notsocket = TRUE;
4279 /* Otherwise, set the sender host as unknown except for inetd calls. This
4280 prevents host checking in the case of -bs not from inetd and also for -bS. */
4282 else if (!is_inetd) sender_host_unknown = TRUE;
4284 /* If stdout does not exist, then dup stdin to stdout. This can happen
4285 if exim is started from inetd. In this case fd 0 will be set to the socket,
4286 but fd 1 will not be set. This also happens for passed SMTP channels. */
4288 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4290 /* Set up the incoming protocol name and the state of the program. Root
4291 is allowed to force received protocol via the -oMr option above, and if we are
4292 in a non-local SMTP state it means we have come via inetd and the process info
4293 has already been set up. We don't set received_protocol here for smtp input,
4294 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4298 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4303 if (received_protocol == NULL)
4304 received_protocol = string_sprintf("local%s", called_as);
4305 set_process_info("accepting a local non-SMTP message from <%s>",
4309 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4313 local_queue_only = queue_only;
4315 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4316 the spool if so configured. On failure, we must not attempt to send an error
4317 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4318 error code is given.) */
4320 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4322 fprintf(stderr, "exim: insufficient disk space\n");
4323 return EXIT_FAILURE;
4326 /* If this is smtp input of any kind, handle the start of the SMTP
4333 if (verify_check_host(&hosts_connection_nolog) == OK)
4334 log_write_selector &= ~L_smtp_connection;
4335 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4336 if (!smtp_start_session())
4339 exim_exit(EXIT_SUCCESS);
4343 /* Otherwise, set up the input size limit here */
4347 thismessage_size_limit = expand_string_integer(message_size_limit);
4348 if (thismessage_size_limit < 0)
4350 if (thismessage_size_limit == -1)
4351 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4352 "message_size_limit: %s", expand_string_message);
4354 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4355 "message_size_limit: %s", expand_string_message);
4359 /* Loop for several messages when reading SMTP input. If we fork any child
4360 processes, we don't want to wait for them unless synchronous delivery is
4361 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4362 same as SIG_DFL, despite the fact that documentation often lists the default as
4363 "ignore". This is a confusing area. This is what I know:
4365 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4366 processes that complete simply to go away without ever becoming defunct. You
4367 can't then wait for them - but we don't want to wait for them in the
4368 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4369 happen for all OS (e.g. *BSD is different).
4371 But that's not the end of the story. Some (many? all?) systems have the
4372 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4373 has by default, so it seems that the difference is merely one of default
4374 (compare restarting vs non-restarting signals).
4376 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4377 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4378 of the loop below. Paranoia rules.
4380 February 2003: That's *still* not the end of the story. There are now versions
4381 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4382 process then calls waitpid(), a grumble is written to the system log, because
4383 this is logically inconsistent. In other words, it doesn't like the paranoia.
4384 As a consequenc of this, the waitpid() below is now excluded if we are sure
4385 that SIG_IGN works. */
4387 if (!synchronous_delivery)
4390 struct sigaction act;
4391 act.sa_handler = SIG_IGN;
4392 sigemptyset(&(act.sa_mask));
4393 act.sa_flags = SA_NOCLDWAIT;
4394 sigaction(SIGCHLD, &act, NULL);
4396 signal(SIGCHLD, SIG_IGN);
4400 /* Save the current store pool point, for resetting at the start of
4401 each message, and save the real sender address, if any. */
4403 reset_point = store_get(0);
4404 real_sender_address = sender_address;
4406 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4407 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4412 store_reset(reset_point);
4415 /* In the SMTP case, we have to handle the initial SMTP input and build the
4416 recipients list, before calling receive_msg() to read the message proper.
4417 Whatever sender address is actually given in the SMTP transaction is
4418 actually ignored for local senders - we use the actual sender, which is
4419 normally either the underlying user running this process or a -f argument
4420 provided by a trusted caller. It is saved in real_sender_address.
4422 However, if this value is NULL, we are dealing with a trusted caller when
4423 -f was not used; in this case, the SMTP sender is allowed to stand.
4425 Also, if untrusted_set_sender is set, we permit sender addresses that match
4426 anything in its list.
4428 The variable raw_sender_address holds the sender address before rewriting. */
4433 if ((rc = smtp_setup_msg()) > 0)
4435 if (real_sender_address != NULL &&
4436 !receive_check_set_sender(sender_address))
4438 sender_address = raw_sender = real_sender_address;
4439 sender_address_unrewritten = NULL;
4441 more = receive_msg(extract_recipients);
4442 if (message_id[0] == 0)
4445 exim_exit(EXIT_FAILURE);
4448 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4451 /* In the non-SMTP case, we have all the information from the command
4452 line, but must process it in case it is in the more general RFC822
4453 format, and in any case, to detect syntax errors. Also, it appears that
4454 the use of comma-separated lists as single arguments is common, so we
4455 had better support them. */
4461 int count = argc - recipients_arg;
4462 uschar **list = argv + recipients_arg;
4464 /* These options cannot be changed dynamically for non-SMTP messages */
4466 active_local_sender_retain = local_sender_retain;
4467 active_local_from_check = local_from_check;
4469 /* Save before any rewriting */
4471 raw_sender = string_copy(sender_address);
4473 /* Loop for each argument */
4475 for (i = 0; i < count; i++)
4477 int start, end, domain;
4479 uschar *s = list[i];
4481 /* Loop for each comma-separated address */
4485 BOOL finished = FALSE;
4487 uschar *ss = parse_find_address_end(s, FALSE);
4489 if (*ss == ',') *ss = 0; else finished = TRUE;
4491 /* Check max recipients - if -t was used, these aren't recipients */
4493 if (recipients_max > 0 && ++rcount > recipients_max &&
4494 !extract_recipients)
4496 if (error_handling == ERRORS_STDERR)
4498 fprintf(stderr, "exim: too many recipients\n");
4499 exim_exit(EXIT_FAILURE);
4504 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4505 errors_sender_rc : EXIT_FAILURE;
4510 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4512 if (domain == 0 && !allow_unqualified_recipient)
4515 errmess = US"unqualified recipient address not allowed";
4518 if (recipient == NULL)
4520 if (error_handling == ERRORS_STDERR)
4522 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4523 string_printing(list[i]), errmess);
4524 exim_exit(EXIT_FAILURE);
4530 eblock.text1 = string_printing(list[i]);
4531 eblock.text2 = errmess;
4533 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4534 errors_sender_rc : EXIT_FAILURE;
4538 receive_add_recipient(recipient, -1);
4541 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4545 /* Show the recipients when debugging */
4550 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4551 if (recipients_list != NULL)
4553 debug_printf("Recipients:\n");
4554 for (i = 0; i < recipients_count; i++)
4555 debug_printf(" %s\n", recipients_list[i].address);
4559 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4560 will just read the headers for the message, and not write anything onto the
4563 message_ended = END_NOTENDED;
4564 more = receive_msg(extract_recipients);
4566 /* more is always FALSE here (not SMTP message) when reading a message
4567 for real; when reading the headers of a message for filter testing,
4568 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4570 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4571 } /* Non-SMTP message reception */
4573 /* If this is a filter testing run, there are headers in store, but
4574 no message on the spool. Run the filtering code in testing mode, setting
4575 the domain to the qualify domain and the local part to the current user,
4576 unless they have been set by options. The prefix and suffix are left unset
4577 unless specified. The the return path is set to to the sender unless it has
4578 already been set from a return-path header in the message. */
4580 if (filter_test != FTEST_NONE)
4582 deliver_domain = (ftest_domain != NULL)?
4583 ftest_domain : qualify_domain_recipient;
4584 deliver_domain_orig = deliver_domain;
4585 deliver_localpart = (ftest_localpart != NULL)?
4586 ftest_localpart : originator_login;
4587 deliver_localpart_orig = deliver_localpart;
4588 deliver_localpart_prefix = ftest_prefix;
4589 deliver_localpart_suffix = ftest_suffix;
4590 deliver_home = originator_home;
4592 if (return_path == NULL)
4594 printf("Return-path copied from sender\n");
4595 return_path = string_copy(sender_address);
4599 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4601 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4603 receive_add_recipient(
4604 string_sprintf("%s%s%s@%s",
4605 (ftest_prefix == NULL)? US"" : ftest_prefix,
4607 (ftest_suffix == NULL)? US"" : ftest_suffix,
4608 deliver_domain), -1);
4610 printf("Recipient = %s\n", recipients_list[0].address);
4611 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4612 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4614 chdir("/"); /* Get away from wherever the user is running this from */
4616 /* Now we run either a system filter test, or a user filter test, or both.
4617 In the latter case, headers added by the system filter will persist and be
4618 available to the user filter. We need to copy the filter variables
4621 if ((filter_test & FTEST_SYSTEM) != 0)
4623 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4624 exim_exit(EXIT_FAILURE);
4627 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4629 if ((filter_test & FTEST_USER) != 0)
4631 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4632 exim_exit(EXIT_FAILURE);
4635 exim_exit(EXIT_SUCCESS);
4638 /* Else act on the result of message reception. We should not get here unless
4639 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4640 TRUE. If it is not, check on the number of messages received in this
4641 connection. If that's OK and queue_only_load is set, check that the load
4642 average is below it. If it is not, set local_queue_only TRUE. Note that it
4643 then remains this way for any subsequent messages on the same SMTP connection.
4644 This is a deliberate choice; even though the load average may fall, it
4645 doesn't seem right to deliver later messages on the same call when not
4646 delivering earlier ones. */
4648 if (!local_queue_only)
4650 if (smtp_accept_queue_per_connection > 0 &&
4651 receive_messagecount > smtp_accept_queue_per_connection)
4653 local_queue_only = TRUE;
4654 queue_only_reason = 2;
4656 else if (queue_only_load >= 0)
4658 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4659 if (local_queue_only) queue_only_reason = 3;
4663 /* If running as an MUA wrapper, all queueing options and freezing options
4667 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4669 /* Log the queueing here, when it will get a message id attached, but
4670 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4673 if (local_queue_only) switch(queue_only_reason)
4676 log_write(L_delay_delivery,
4677 LOG_MAIN, "no immediate delivery: more than %d messages "
4678 "received in one connection", smtp_accept_queue_per_connection);
4682 log_write(L_delay_delivery,
4683 LOG_MAIN, "no immediate delivery: load average %.2f",
4684 (double)load_average/1000.0);
4688 /* Else do the delivery unless the ACL or local_scan() called for queue only
4689 or froze the message. Always deliver in a separate process. A fork failure is
4690 not a disaster, as the delivery will eventually happen on a subsequent queue
4691 run. The search cache must be tidied before the fork, as the parent will
4692 do it before exiting. The child will trigger a lookup failure and
4693 thereby defer the delivery if it tries to use (for example) a cached ldap
4694 connection that the parent has called unbind on. */
4696 else if (!queue_only_policy && !deliver_freeze)
4701 if ((pid = fork()) == 0)
4704 close_unwanted(); /* Close unwanted file descriptors and TLS */
4705 exim_nullstd(); /* Ensure std{in,out,err} exist */
4707 /* Occasionally in the test harness we don't have synchronous delivery
4708 set (can happen with bounces). In that case, let the old process finish
4709 before continuing, to keep the debug output the same. */
4711 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4713 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4714 mode, deliver_drop_privilege is forced TRUE). */
4716 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4718 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4720 /* Control does not return here. */
4723 /* No need to re-exec */
4725 rc = deliver_message(message_id, FALSE, FALSE);
4727 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4728 EXIT_SUCCESS : EXIT_FAILURE);
4733 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4734 "process: %s", strerror(errno));
4737 /* In the parent, wait if synchronous delivery is required. This will
4738 always be the case in MUA wrapper mode. */
4740 else if (synchronous_delivery)
4743 while (wait(&status) != pid);
4744 if ((status & 0x00ff) != 0)
4745 log_write(0, LOG_MAIN|LOG_PANIC,
4746 "process %d crashed with signal %d while delivering %s",
4747 (int)pid, status & 0x00ff, message_id);
4748 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4752 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4753 automatically reaps children (see comments above the loop), clear away any
4754 finished subprocesses here, in case there are lots of messages coming in
4755 from the same source. */
4757 #ifndef SIG_IGN_WORKS
4758 while (waitpid(-1, NULL, WNOHANG) > 0);
4762 exim_exit(EXIT_SUCCESS); /* Never returns */
4763 return 0; /* To stop compiler warning */