1 /* $Cambridge: exim/src/src/exim.c,v 1.41 2006/07/13 13:53:33 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
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 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
390 filename the file name
391 options the fopen() options
392 mode the required mode
394 Returns: the fopened FILE or NULL
398 modefopen(uschar *filename, char *options, mode_t mode)
400 mode_t saved_umask = umask(0777);
401 FILE *f = Ufopen(filename, options);
402 (void)umask(saved_umask);
403 if (f != NULL) (void)fchmod(fileno(f), mode);
410 /*************************************************
411 * Ensure stdin, stdout, and stderr exist *
412 *************************************************/
414 /* Some operating systems grumble if an exec() happens without a standard
415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
416 file will be opened and will use these fd values, and then some other bit of
417 code will assume, for example, that it can write error messages to stderr.
418 This function ensures that fds 0, 1, and 2 are open if they do not already
419 exist, by connecting them to /dev/null.
421 This function is also used to ensure that std{in,out,err} exist at all times,
422 so that if any library that Exim calls tries to use them, it doesn't crash.
434 for (i = 0; i <= 2; i++)
436 if (fstat(i, &statbuf) < 0 && errno == EBADF)
438 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
439 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
440 string_open_failed(errno, "/dev/null"));
441 if (devnull != i) (void)dup2(devnull, i);
444 if (devnull > 2) (void)close(devnull);
450 /*************************************************
451 * Close unwanted file descriptors for delivery *
452 *************************************************/
454 /* This function is called from a new process that has been forked to deliver
455 an incoming message, either directly, or using exec.
457 We want any smtp input streams to be closed in this new process. However, it
458 has been observed that using fclose() here causes trouble. When reading in -bS
459 input, duplicate copies of messages have been seen. The files will be sharing a
460 file pointer with the parent process, and it seems that fclose() (at least on
461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
462 least sometimes. Hence we go for closing the underlying file descriptors.
464 If TLS is active, we want to shut down the TLS library, but without molesting
465 the parent's SSL connection.
467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
468 stderr unless debugging) because the calling process might have set them up as
469 pipes and be waiting for them to close before it waits for the submission
470 process to terminate. If they aren't closed, they hold up the calling process
471 until the initial delivery process finishes, which is not what we want.
473 Exception: We do want it for synchronous delivery!
475 And notwithstanding all the above, if D_resolver is set, implying resolver
476 debugging, leave stdout open, because that's where the resolver writes its
479 When we close stderr (which implies we've also closed stdout), we also get rid
480 of any controlling terminal.
492 tls_close(FALSE); /* Shut down the TLS library */
494 (void)close(fileno(smtp_in));
495 (void)close(fileno(smtp_out));
500 (void)close(0); /* stdin */
501 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
502 if (debug_selector == 0) /* stderr */
504 if (!synchronous_delivery)
517 /*************************************************
519 *************************************************/
521 /* This function sets a new uid and gid permanently, optionally calling
522 initgroups() to set auxiliary groups. There are some special cases when running
523 Exim in unprivileged modes. In these situations the effective uid will not be
524 root; if we already have the right effective uid/gid, and don't need to
525 initialize any groups, leave things as they are.
530 igflag TRUE if initgroups() wanted
531 msg text to use in debugging output and failure log
533 Returns: nothing; bombs out on failure
537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
539 uid_t euid = geteuid();
540 gid_t egid = getegid();
542 if (euid == root_uid || euid != uid || egid != gid || igflag)
544 /* At least one OS returns +1 for initgroups failure, so just check for
549 struct passwd *pw = getpwuid(uid);
552 if (initgroups(pw->pw_name, gid) != 0)
553 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
554 (long int)uid, strerror(errno));
556 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
557 "no passwd entry for uid=%ld", (long int)uid);
560 if (setgid(gid) < 0 || setuid(uid) < 0)
562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
563 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
567 /* Debugging output included uid/gid and all groups */
572 gid_t group_list[NGROUPS_MAX];
573 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
574 (long int)geteuid(), (long int)getegid(), (long int)getpid());
575 group_count = getgroups(NGROUPS_MAX, group_list);
576 debug_printf(" auxiliary group list:");
580 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
582 else debug_printf(" <none>");
590 /*************************************************
592 *************************************************/
594 /* Exim exits via this function so that it always clears up any open
600 Returns: does not return
608 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
609 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
616 /*************************************************
617 * Extract port from host address *
618 *************************************************/
620 /* Called to extract the port from the values given to -oMa and -oMi.
621 It also checks the syntax of the address, and terminates it before the
622 port data when a port is extracted.
625 address the address, with possible port on the end
627 Returns: the port, or zero if there isn't one
628 bombs out on a syntax error
632 check_port(uschar *address)
634 int port = host_address_extract_port(address);
635 if (string_is_ip_address(address, NULL) == 0)
637 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
645 /*************************************************
646 * Test/verify an address *
647 *************************************************/
649 /* This function is called by the -bv and -bt code. It extracts a working
650 address from a full RFC 822 address. This isn't really necessary per se, but it
651 has the effect of collapsing source routes.
655 flags flag bits for verify_address()
656 exit_value to be set for failures
662 test_address(uschar *s, int flags, int *exit_value)
664 int start, end, domain;
665 uschar *parse_error = NULL;
666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
670 fprintf(stdout, "syntax error: %s\n", parse_error);
675 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
676 -1, -1, NULL, NULL, NULL);
677 if (rc == FAIL) *exit_value = 2;
678 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
684 /*************************************************
685 * Decode bit settings for log/debug *
686 *************************************************/
688 /* This function decodes a string containing bit settings in the form of +name
689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
690 also recognizes a numeric setting of the form =<number>, but this is not
691 intended for user use. It's an easy way for Exim to pass the debug settings
692 when it is re-exec'ed.
694 The log options are held in two unsigned ints (because there became too many
695 for one). The top bit in the table means "put in 2nd selector". This does not
696 yet apply to debug options, so the "=" facility sets only the first selector.
698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
699 It sets all the bits in both selectors. However, there is a facility for then
700 unsetting certain bits, because we want to turn off "memory" in the debug case.
702 A bad value for a debug setting is treated as an unknown option - error message
703 to stderr and die. For log settings, which come from the configuration file,
704 we write to the log on the way out...
707 selector1 address of the first bit string
708 selector2 address of the second bit string, or NULL
709 notall1 bits to exclude from "all" for selector1
710 notall2 bits to exclude from "all" for selector2
711 string the configured string
712 options the table of option names
714 which "log" or "debug"
716 Returns: nothing on success - bomb out on failure
720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
721 int notall2, uschar *string, bit_table *options, int count, uschar *which)
724 if (string == NULL) return;
728 char *end; /* Not uschar */
729 *selector1 = strtoul(CS string+1, &end, 0);
730 if (*end == 0) return;
731 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
736 /* Handle symbolic setting */
743 bit_table *start, *end;
745 while (isspace(*string)) string++;
746 if (*string == 0) return;
748 if (*string != '+' && *string != '-')
750 errmsg = string_sprintf("malformed %s_selector setting: "
751 "+ or - expected but found \"%s\"", which, string);
755 adding = *string++ == '+';
757 while (isalnum(*string) || *string == '_') string++;
761 end = options + count;
765 bit_table *middle = start + (end - start)/2;
766 int c = Ustrncmp(s, middle->name, len);
769 if (middle->name[len] != 0) c = -1; else
771 unsigned int bit = middle->bit;
772 unsigned int *selector;
774 /* The value with all bits set means "force all bits in both selectors"
775 in the case where two are being handled. However, the top bit in the
776 second selector is never set. When setting, some bits can be excluded.
779 if (bit == 0xffffffff)
783 *selector1 = 0xffffffff ^ notall1;
784 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
789 if (selector2 != NULL) *selector2 = 0;
793 /* Otherwise, the 0x80000000 bit means "this value, without the top
794 bit, belongs in the second selector". */
798 if ((bit & 0x80000000) != 0)
800 selector = selector2;
803 else selector = selector1;
804 if (adding) *selector |= bit; else *selector &= ~bit;
806 break; /* Out of loop to match selector name */
809 if (c < 0) end = middle; else start = middle + 1;
810 } /* Loop to match selector name */
814 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
815 adding? '+' : '-', len, s);
818 } /* Loop for selector names */
820 /* Handle disasters */
823 if (Ustrcmp(which, "debug") == 0)
825 fprintf(stderr, "exim: %s\n", errmsg);
828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
833 /*************************************************
834 * Show supported features *
835 *************************************************/
837 /* This function is called for -bV and for -d to output the optional features
838 of the current Exim binary.
840 Arguments: a FILE for printing
845 show_whats_supported(FILE *f)
847 #ifdef DB_VERSION_STRING
848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
851 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
853 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
856 fprintf(f, "Probably ndbm\n");
857 #elif defined(USE_TDB)
858 fprintf(f, "Using tdb\n");
861 fprintf(f, "Probably GDBM (native mode)\n");
863 fprintf(f, "Probably GDBM (compatibility mode)\n");
867 fprintf(f, "Support for:");
868 #ifdef SUPPORT_CRYPTEQ
869 fprintf(f, " crypteq");
872 fprintf(f, " iconv()");
877 #ifdef HAVE_SETCLASSRESOURCES
878 fprintf(f, " use_setclassresources");
887 fprintf(f, " Expand_dlfunc");
889 #ifdef USE_TCP_WRAPPERS
890 fprintf(f, " TCPwrappers");
894 fprintf(f, " GnuTLS");
896 fprintf(f, " OpenSSL");
899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
900 fprintf(f, " translate_ip_address");
902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
903 fprintf(f, " move_frozen_messages");
905 #ifdef WITH_CONTENT_SCAN
906 fprintf(f, " Content_Scanning");
908 #ifdef WITH_OLD_DEMIME
909 fprintf(f, " Old_Demime");
911 #ifdef EXPERIMENTAL_SPF
912 fprintf(f, " Experimental_SPF");
914 #ifdef EXPERIMENTAL_SRS
915 fprintf(f, " Experimental_SRS");
917 #ifdef EXPERIMENTAL_BRIGHTMAIL
918 fprintf(f, " Experimental_Brightmail");
920 #ifdef EXPERIMENTAL_DOMAINKEYS
921 fprintf(f, " Experimental_DomainKeys");
925 fprintf(f, "Lookups:");
926 #ifdef LOOKUP_LSEARCH
927 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
933 fprintf(f, " dbm dbmnz");
936 fprintf(f, " dnsdb");
938 #ifdef LOOKUP_DSEARCH
939 fprintf(f, " dsearch");
942 fprintf(f, " ibase");
945 fprintf(f, " ldap ldapdn ldapm");
948 fprintf(f, " mysql");
951 fprintf(f, " nis nis0");
953 #ifdef LOOKUP_NISPLUS
954 fprintf(f, " nisplus");
957 fprintf(f, " oracle");
960 fprintf(f, " passwd");
963 fprintf(f, " pgsql");
966 fprintf(f, " sqlite");
969 fprintf(f, " testdb");
972 fprintf(f, " whoson");
976 fprintf(f, "Authenticators:");
978 fprintf(f, " cram_md5");
980 #ifdef AUTH_CYRUS_SASL
981 fprintf(f, " cyrus_sasl");
983 #ifdef AUTH_PLAINTEXT
984 fprintf(f, " plaintext");
991 fprintf(f, "Routers:");
993 fprintf(f, " accept");
995 #ifdef ROUTER_DNSLOOKUP
996 fprintf(f, " dnslookup");
998 #ifdef ROUTER_IPLITERAL
999 fprintf(f, " ipliteral");
1001 #ifdef ROUTER_IPLOOKUP
1002 fprintf(f, " iplookup");
1004 #ifdef ROUTER_MANUALROUTE
1005 fprintf(f, " manualroute");
1007 #ifdef ROUTER_QUERYPROGRAM
1008 fprintf(f, " queryprogram");
1010 #ifdef ROUTER_REDIRECT
1011 fprintf(f, " redirect");
1015 fprintf(f, "Transports:");
1016 #ifdef TRANSPORT_APPENDFILE
1017 fprintf(f, " appendfile");
1018 #ifdef SUPPORT_MAILDIR
1019 fprintf(f, "/maildir");
1021 #ifdef SUPPORT_MAILSTORE
1022 fprintf(f, "/mailstore");
1028 #ifdef TRANSPORT_AUTOREPLY
1029 fprintf(f, " autoreply");
1031 #ifdef TRANSPORT_LMTP
1032 fprintf(f, " lmtp");
1034 #ifdef TRANSPORT_PIPE
1035 fprintf(f, " pipe");
1037 #ifdef TRANSPORT_SMTP
1038 fprintf(f, " smtp");
1042 if (fixed_never_users[0] > 0)
1045 fprintf(f, "Fixed never_users: ");
1046 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1047 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1048 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1051 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1057 /*************************************************
1058 * Quote a local part *
1059 *************************************************/
1061 /* This function is used when a sender address or a From: or Sender: header
1062 line is being created from the caller's login, or from an authenticated_id. It
1063 applies appropriate quoting rules for a local part.
1065 Argument: the local part
1066 Returns: the local part, quoted if necessary
1070 local_part_quote(uschar *lpart)
1072 BOOL needs_quote = FALSE;
1077 for (t = lpart; !needs_quote && *t != 0; t++)
1079 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1080 (*t != '.' || t == lpart || t[1] == 0);
1083 if (!needs_quote) return lpart;
1086 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1090 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1093 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1096 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1097 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1098 yield = string_cat(yield, &size, &ptr, nq, 1);
1102 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1110 /*************************************************
1111 * Load readline() functions *
1112 *************************************************/
1114 /* This function is called from testing executions that read data from stdin,
1115 but only when running as the calling user. Currently, only -be does this. The
1116 function loads the readline() function library and passes back the functions.
1117 On some systems, it needs the curses library, so load that too, but try without
1118 it if loading fails. All this functionality has to be requested at build time.
1121 fn_readline_ptr pointer to where to put the readline pointer
1122 fn_addhist_ptr pointer to where to put the addhistory function
1124 Returns: the dlopen handle or NULL on failure
1128 set_readline(char * (**fn_readline_ptr)(char *),
1129 char * (**fn_addhist_ptr)(char *))
1132 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1134 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1135 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1137 if (dlhandle != NULL)
1139 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1140 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1144 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1153 /*************************************************
1154 * Get a line from stdin for testing things *
1155 *************************************************/
1157 /* This function is called when running tests that can take a number of lines
1158 of input (for example, -be and -bt). It handles continuations and trailing
1159 spaces. And prompting and a blank line output on eof. If readline() is in use,
1160 the arguments are non-NULL and provide the relevant functions.
1163 fn_readline readline function or NULL
1164 fn_addhist addhist function or NULL
1166 Returns: pointer to dynamic memory, or NULL at end of file
1170 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1175 uschar *yield = NULL;
1177 if (fn_readline == NULL) printf("> ");
1181 uschar buffer[1024];
1185 char *readline_line = NULL;
1186 if (fn_readline != NULL)
1188 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1189 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1190 p = US readline_line;
1195 /* readline() not in use */
1198 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1202 /* Handle the line */
1204 ss = p + (int)Ustrlen(p);
1205 while (ss > p && isspace(ss[-1])) ss--;
1209 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1212 yield = string_cat(yield, &size, &ptr, p, ss - p);
1215 if (fn_readline != NULL) free(readline_line);
1218 if (ss == p || yield[ptr-1] != '\\')
1226 if (yield == NULL) printf("\n");
1232 /*************************************************
1233 * Entry point and high-level code *
1234 *************************************************/
1236 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1237 the appropriate action. All the necessary functions are present in the one
1238 binary. I originally thought one should split it up, but it turns out that so
1239 much of the apparatus is needed in each chunk that one might as well just have
1240 it all available all the time, which then makes the coding easier as well.
1243 argc count of entries in argv
1244 argv argument strings, with argv[0] being the program name
1246 Returns: EXIT_SUCCESS if terminated successfully
1247 EXIT_FAILURE otherwise, except when a message has been sent
1248 to the sender, and -oee was given
1252 main(int argc, char **cargv)
1254 uschar **argv = USS cargv;
1255 int arg_receive_timeout = -1;
1256 int arg_smtp_receive_timeout = -1;
1257 int arg_error_handling = error_handling;
1258 int filter_sfd = -1;
1259 int filter_ufd = -1;
1262 int list_queue_option = 0;
1264 int msg_action_arg = -1;
1265 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1266 int queue_only_reason = 0;
1268 int perl_start_option = 0;
1270 int recipients_arg = argc;
1271 int sender_address_domain = 0;
1272 int test_retry_arg = -1;
1273 int test_rewrite_arg = -1;
1274 BOOL arg_queue_only = FALSE;
1275 BOOL bi_option = FALSE;
1276 BOOL checking = FALSE;
1277 BOOL count_queue = FALSE;
1278 BOOL expansion_test = FALSE;
1279 BOOL extract_recipients = FALSE;
1280 BOOL forced_delivery = FALSE;
1281 BOOL f_end_dot = FALSE;
1282 BOOL deliver_give_up = FALSE;
1283 BOOL list_queue = FALSE;
1284 BOOL list_options = FALSE;
1285 BOOL local_queue_only;
1287 BOOL one_msg_action = FALSE;
1288 BOOL queue_only_set = FALSE;
1289 BOOL receiving_message = TRUE;
1291 BOOL removed_privilege = FALSE;
1292 BOOL verify_address_mode = FALSE;
1293 BOOL verify_as_sender = FALSE;
1294 BOOL version_printed = FALSE;
1295 uschar *alias_arg = NULL;
1296 uschar *called_as = US"";
1297 uschar *start_queue_run_id = NULL;
1298 uschar *stop_queue_run_id = NULL;
1299 uschar *ftest_domain = NULL;
1300 uschar *ftest_localpart = NULL;
1301 uschar *ftest_prefix = NULL;
1302 uschar *ftest_suffix = NULL;
1303 uschar *real_sender_address;
1304 uschar *originator_home = US"/";
1308 struct stat statbuf;
1309 pid_t passed_qr_pid = (pid_t)0;
1310 int passed_qr_pipe = -1;
1311 gid_t group_list[NGROUPS_MAX];
1313 /* Possible options for -R and -S */
1315 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1317 /* Need to define this in case we need to change the environment in order
1318 to get rid of a bogus time zone. We have to make it char rather than uschar
1319 because some OS define it in /usr/include/unistd.h. */
1321 extern char **environ;
1323 /* If the Exim user and/or group and/or the configuration file owner/group were
1324 defined by ref:name at build time, we must now find the actual uid/gid values.
1325 This is a feature to make the lives of binary distributors easier. */
1327 #ifdef EXIM_USERNAME
1328 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1330 exim_gid = pw->pw_gid;
1334 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1340 #ifdef EXIM_GROUPNAME
1341 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1343 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1349 #ifdef CONFIGURE_OWNERNAME
1350 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1352 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1353 CONFIGURE_OWNERNAME);
1358 #ifdef CONFIGURE_GROUPNAME
1359 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1361 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1362 CONFIGURE_GROUPNAME);
1367 /* In the Cygwin environment, some initialization needs doing. It is fudged
1368 in by means of this macro. */
1374 /* Check a field which is patched when we are running Exim within its
1375 testing harness; do a fast initial check, and then the whole thing. */
1377 running_in_test_harness =
1378 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1380 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1381 at the start of a program; however, it seems that some environments do not
1382 follow this. A "strange" locale can affect the formatting of timestamps, so we
1385 setlocale(LC_ALL, "C");
1387 /* Set up the default handler for timing using alarm(). */
1389 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1391 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1392 because store_malloc writes a log entry on failure. */
1394 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1395 if (log_buffer == NULL)
1397 fprintf(stderr, "exim: failed to get store for log buffer\n");
1401 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1402 NULL when the daemon is run and the file is closed. We have to use this
1403 indirection, because some systems don't allow writing to the variable "stderr".
1406 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1408 /* Arrange for the PCRE regex library to use our store functions. Note that
1409 the normal calls are actually macros that add additional arguments for
1410 debugging purposes so we have to assign specially constructed functions here.
1411 The default is to use store in the stacking pool, but this is overridden in the
1412 regex_must_compile() function. */
1414 pcre_malloc = function_store_get;
1415 pcre_free = function_dummy_free;
1417 /* Ensure there is a big buffer for temporary use in several places. It is put
1418 in malloc store so that it can be freed for enlargement if necessary. */
1420 big_buffer = store_malloc(big_buffer_size);
1422 /* Set up the handler for the data request signal, and set the initial
1423 descriptive text. */
1425 set_process_info("initializing");
1426 os_restarting_signal(SIGUSR1, usr1_handler);
1428 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1429 in the daemon code. For the rest of Exim's uses, we ignore it. */
1431 signal(SIGHUP, SIG_IGN);
1433 /* We don't want to die on pipe errors as the code is written to handle
1434 the write error instead. */
1436 signal(SIGPIPE, SIG_IGN);
1438 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1439 set to SIG_IGN. This causes subprocesses that complete before the parent
1440 process waits for them not to hang around, so when Exim calls wait(), nothing
1441 is there. The wait() code has been made robust against this, but let's ensure
1442 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1443 ending status. We use sigaction rather than plain signal() on those OS where
1444 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1445 problem on AIX with this.) */
1449 struct sigaction act;
1450 act.sa_handler = SIG_DFL;
1451 sigemptyset(&(act.sa_mask));
1453 sigaction(SIGCHLD, &act, NULL);
1456 signal(SIGCHLD, SIG_DFL);
1459 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1464 /* Set up the version number. Set up the leading 'E' for the external form of
1465 message ids, set the pointer to the internal form, and initialize it to
1466 indicate no message being processed. */
1469 message_id_option[0] = '-';
1470 message_id_external = message_id_option + 1;
1471 message_id_external[0] = 'E';
1472 message_id = message_id_external + 1;
1475 /* Set the umask to zero so that any files Exim creates using open() are
1476 created with the modes that it specifies. NOTE: Files created with fopen() have
1477 a problem, which was not recognized till rather late (February 2006). With this
1478 umask, such files will be world writeable. (They are all content scanning files
1479 in the spool directory, which isn't world-accessible, so this is not a
1480 disaster, but it's untidy.) I don't want to change this overall setting,
1481 however, because it will interact badly with the open() calls. Instead, there's
1482 now a function called modefopen() that fiddles with the umask while calling
1487 /* Precompile the regular expression for matching a message id. Keep this in
1488 step with the code that generates ids in the accept.c module. We need to do
1489 this here, because the -M options check their arguments for syntactic validity
1490 using mac_ismsgid, which uses this. */
1493 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1495 /* Precompile the regular expression that is used for matching an SMTP error
1496 code, possibly extended, at the start of an error message. */
1499 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1502 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1503 this seems to be a generally accepted convention, since one finds symbolic
1504 links called "mailq" in standard OS configurations. */
1506 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1507 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1510 receiving_message = FALSE;
1511 called_as = US"-mailq";
1514 /* If the program is called as "rmail" treat it as equivalent to
1515 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1516 i.e. preventing a single dot on a line from terminating the message, and
1517 returning with zero return code, even in cases of error (provided an error
1518 message has been sent). */
1520 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1521 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1524 called_as = US"-rmail";
1525 errors_sender_rc = EXIT_SUCCESS;
1528 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1529 this is a smail convention. */
1531 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1532 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1534 smtp_input = smtp_batched_input = TRUE;
1535 called_as = US"-rsmtp";
1538 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1539 this is a smail convention. */
1541 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1542 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1545 receiving_message = FALSE;
1546 called_as = US"-runq";
1549 /* If the program is called as "newaliases" treat it as equivalent to
1550 "exim -bi"; this is a sendmail convention. */
1552 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1553 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1556 receiving_message = FALSE;
1557 called_as = US"-newaliases";
1560 /* Save the original effective uid for a couple of uses later. It should
1561 normally be root, but in some esoteric environments it may not be. */
1563 original_euid = geteuid();
1565 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1566 to be the same as the real ones. This makes a difference only if Exim is setuid
1567 (or setgid) to something other than root, which could be the case in some
1568 special configurations. */
1570 real_uid = getuid();
1571 real_gid = getgid();
1573 if (real_uid == root_uid)
1579 /* If neither the original real uid nor the original euid was root, Exim is
1580 running in an unprivileged state. */
1582 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1584 /* If the first argument is --help, pretend there are no arguments. This will
1585 cause a brief message to be given. */
1587 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1589 /* Scan the program's arguments. Some can be dealt with right away; others are
1590 simply recorded for checking and handling afterwards. Do a high-level switch
1591 on the second character (the one after '-'), to save some effort. */
1593 for (i = 1; i < argc; i++)
1595 BOOL badarg = FALSE;
1596 uschar *arg = argv[i];
1600 /* An argument not starting with '-' is the start of a recipients list;
1601 break out of the options-scanning loop. */
1609 /* An option consistion of -- terminates the options */
1611 if (Ustrcmp(arg, "--") == 0)
1613 recipients_arg = i + 1;
1617 /* Handle flagged options */
1619 switchchar = arg[1];
1622 /* Make all -ex options synonymous with -oex arguments, since that
1623 is assumed by various callers. Also make -qR options synonymous with -R
1624 options, as that seems to be required as well. Allow for -qqR too, and
1625 the same for -S options. */
1627 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1628 Ustrncmp(arg+1, "qR", 2) == 0 ||
1629 Ustrncmp(arg+1, "qS", 2) == 0)
1631 switchchar = arg[2];
1634 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1636 switchchar = arg[3];
1638 queue_2stage = TRUE;
1641 /* Make -r synonymous with -f, since it is a documented alias */
1643 else if (arg[1] == 'r') switchchar = 'f';
1645 /* Make -ov synonymous with -v */
1647 else if (Ustrcmp(arg, "-ov") == 0)
1653 /* High-level switch on active initial letter */
1657 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1658 so has no need of it. */
1661 if (*argrest == 0) i++; /* Skip over the type */
1666 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1668 /* -bd: Run in daemon mode, awaiting SMTP connections.
1669 -bdf: Ditto, but in the foreground.
1672 if (*argrest == 'd')
1674 daemon_listen = TRUE;
1675 if (*(++argrest) == 'f') background_daemon = FALSE;
1676 else if (*argrest != 0) { badarg = TRUE; break; }
1679 /* -be: Run in expansion test mode */
1681 else if (*argrest == 'e')
1682 expansion_test = checking = TRUE;
1684 /* -bF: Run system filter test */
1686 else if (*argrest == 'F')
1688 filter_test |= FTEST_SYSTEM;
1689 if (*(++argrest) != 0) { badarg = TRUE; break; }
1690 if (++i < argc) filter_test_sfile = argv[i]; else
1692 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1697 /* -bf: Run user filter test
1698 -bfd: Set domain for filter testing
1699 -bfl: Set local part for filter testing
1700 -bfp: Set prefix for filter testing
1701 -bfs: Set suffix for filter testing
1704 else if (*argrest == 'f')
1706 if (*(++argrest) == 0)
1708 filter_test |= FTEST_USER;
1709 if (++i < argc) filter_test_ufile = argv[i]; else
1711 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1719 fprintf(stderr, "exim: string expected after %s\n", arg);
1722 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1723 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1724 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1725 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1726 else { badarg = TRUE; break; }
1730 /* -bh: Host checking - an IP address must follow. */
1732 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1734 if (++i >= argc) { badarg = TRUE; break; }
1735 sender_host_address = argv[i];
1736 host_checking = checking = log_testing_mode = TRUE;
1737 host_checking_callout = argrest[1] == 'c';
1740 /* -bi: This option is used by sendmail to initialize *the* alias file,
1741 though it has the -oA option to specify a different file. Exim has no
1742 concept of *the* alias file, but since Sun's YP make script calls
1743 sendmail this way, some support must be provided. */
1745 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1747 /* -bm: Accept and deliver message - the default option. Reinstate
1748 receiving_message, which got turned off for all -b options. */
1750 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1752 /* -bnq: For locally originating messages, do not qualify unqualified
1753 addresses. In the envelope, this causes errors; in header lines they
1756 else if (Ustrcmp(argrest, "nq") == 0)
1758 allow_unqualified_sender = FALSE;
1759 allow_unqualified_recipient = FALSE;
1762 /* -bpxx: List the contents of the mail queue, in various forms. If
1763 the option is -bpc, just a queue count is needed. Otherwise, if the
1764 first letter after p is r, then order is random. */
1766 else if (*argrest == 'p')
1768 if (*(++argrest) == 'c')
1771 if (*(++argrest) != 0) badarg = TRUE;
1775 if (*argrest == 'r')
1777 list_queue_option = 8;
1780 else list_queue_option = 0;
1784 /* -bp: List the contents of the mail queue, top-level only */
1786 if (*argrest == 0) {}
1788 /* -bpu: List the contents of the mail queue, top-level undelivered */
1790 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1792 /* -bpa: List the contents of the mail queue, including all delivered */
1794 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1796 /* Unknown after -bp[r] */
1806 /* -bP: List the configuration variables given as the address list.
1807 Force -v, so configuration errors get displayed. */
1809 else if (Ustrcmp(argrest, "P") == 0)
1811 list_options = TRUE;
1812 debug_selector |= D_v;
1813 debug_file = stderr;
1816 /* -brt: Test retry configuration lookup */
1818 else if (Ustrcmp(argrest, "rt") == 0)
1820 test_retry_arg = i + 1;
1824 /* -brw: Test rewrite configuration */
1826 else if (Ustrcmp(argrest, "rw") == 0)
1828 test_rewrite_arg = i + 1;
1832 /* -bS: Read SMTP commands on standard input, but produce no replies -
1833 all errors are reported by sending messages. */
1835 else if (Ustrcmp(argrest, "S") == 0)
1836 smtp_input = smtp_batched_input = receiving_message = TRUE;
1838 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1839 on standard output. */
1841 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1843 /* -bt: address testing mode */
1845 else if (Ustrcmp(argrest, "t") == 0)
1846 address_test_mode = checking = log_testing_mode = TRUE;
1848 /* -bv: verify addresses */
1850 else if (Ustrcmp(argrest, "v") == 0)
1851 verify_address_mode = checking = log_testing_mode = TRUE;
1853 /* -bvs: verify sender addresses */
1855 else if (Ustrcmp(argrest, "vs") == 0)
1857 verify_address_mode = checking = log_testing_mode = TRUE;
1858 verify_as_sender = TRUE;
1861 /* -bV: Print version string and support details */
1863 else if (Ustrcmp(argrest, "V") == 0)
1865 printf("Exim version %s #%s built %s\n", version_string,
1866 version_cnumber, version_date);
1867 printf("%s\n", CS version_copyright);
1868 version_printed = TRUE;
1869 show_whats_supported(stdout);
1876 /* -C: change configuration file list; ignore if it isn't really
1877 a change! Enforce a prefix check if required. */
1882 if(++i < argc) argrest = argv[i]; else
1883 { badarg = TRUE; break; }
1885 if (Ustrcmp(config_main_filelist, argrest) != 0)
1887 #ifdef ALT_CONFIG_PREFIX
1889 int len = Ustrlen(ALT_CONFIG_PREFIX);
1890 uschar *list = argrest;
1892 while((filename = string_nextinlist(&list, &sep, big_buffer,
1893 big_buffer_size)) != NULL)
1895 if ((Ustrlen(filename) < len ||
1896 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1897 Ustrstr(filename, "/../") != NULL) &&
1898 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1900 fprintf(stderr, "-C Permission denied\n");
1906 config_main_filelist = argrest;
1907 config_changed = TRUE;
1912 /* -D: set up a macro definition */
1915 #ifdef DISABLE_D_OPTION
1916 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1921 macro_item *mlast = NULL;
1924 uschar *s = argrest;
1926 while (isspace(*s)) s++;
1928 if (*s < 'A' || *s > 'Z')
1930 fprintf(stderr, "exim: macro name set by -D must start with "
1931 "an upper case letter\n");
1935 while (isalnum(*s) || *s == '_')
1937 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1941 if (ptr == 0) { badarg = TRUE; break; }
1942 while (isspace(*s)) s++;
1945 if (*s++ != '=') { badarg = TRUE; break; }
1946 while (isspace(*s)) s++;
1949 for (m = macros; m != NULL; m = m->next)
1951 if (Ustrcmp(m->name, name) == 0)
1953 fprintf(stderr, "exim: duplicated -D in command line\n");
1959 m = store_get(sizeof(macro_item) + Ustrlen(name));
1961 m->command_line = TRUE;
1962 if (mlast == NULL) macros = m; else mlast->next = m;
1963 Ustrcpy(m->name, name);
1964 m->replacement = string_copy(s);
1966 if (clmacro_count >= MAX_CLMACROS)
1968 fprintf(stderr, "exim: too many -D options on command line\n");
1971 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1977 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1978 The latter is now a no-op, retained for compatibility only. If -dd is used,
1979 debugging subprocesses of the daemon is disabled. */
1982 if (Ustrcmp(argrest, "ropcr") == 0)
1984 /* drop_cr = TRUE; */
1987 /* Use an intermediate variable so that we don't set debugging while
1988 decoding the debugging bits. */
1992 unsigned int selector = D_default;
1995 if (*argrest == 'd')
1997 debug_daemon = TRUE;
2001 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2002 debug_options_count, US"debug");
2003 debug_selector = selector;
2008 /* -E: This is a local error message. This option is not intended for
2009 external use at all, but is not restricted to trusted callers because it
2010 does no harm (just suppresses certain error messages) and if Exim is run
2011 not setuid root it won't always be trusted when it generates error
2012 messages using this option. If there is a message id following -E, point
2013 message_reference at it, for logging. */
2016 local_error_message = TRUE;
2017 if (mac_ismsgid(argrest)) message_reference = argrest;
2021 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2022 option, so it looks as if historically the -oex options are also callable
2023 without the leading -o. So we have to accept them. Before the switch,
2024 anything starting -oe has been converted to -e. Exim does not support all
2025 of the sendmail error options. */
2028 if (Ustrcmp(argrest, "e") == 0)
2030 arg_error_handling = ERRORS_SENDER;
2031 errors_sender_rc = EXIT_SUCCESS;
2033 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2034 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2035 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2036 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2041 /* -F: Set sender's full name, used instead of the gecos entry from
2042 the password file. Since users can usually alter their gecos entries,
2043 there's no security involved in using this instead. The data can follow
2044 the -F or be in the next argument. */
2049 if(++i < argc) argrest = argv[i]; else
2050 { badarg = TRUE; break; }
2052 originator_name = argrest;
2053 sender_name_forced = TRUE;
2057 /* -f: Set sender's address - this value is only actually used if Exim is
2058 run by a trusted user, or if untrusted_set_sender is set and matches the
2059 address, except that the null address can always be set by any user. The
2060 test for this happens later, when the value given here is ignored when not
2061 permitted. For an untrusted user, the actual sender is still put in Sender:
2062 if it doesn't match the From: header (unless no_local_from_check is set).
2063 The data can follow the -f or be in the next argument. The -r switch is an
2064 obsolete form of -f but since there appear to be programs out there that
2065 use anything that sendmail has ever supported, better accept it - the
2066 synonymizing is done before the switch above.
2068 At this stage, we must allow domain literal addresses, because we don't
2069 know what the setting of allow_domain_literals is yet. Ditto for trailing
2070 dots and strip_trailing_dot. */
2078 if (i+1 < argc) argrest = argv[++i]; else
2079 { badarg = TRUE; break; }
2083 sender_address = string_sprintf(""); /* Ensure writeable memory */
2087 uschar *temp = argrest + Ustrlen(argrest) - 1;
2088 while (temp >= argrest && isspace(*temp)) temp--;
2089 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2090 allow_domain_literals = TRUE;
2091 strip_trailing_dot = TRUE;
2092 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2093 &sender_address_domain, TRUE);
2094 allow_domain_literals = FALSE;
2095 strip_trailing_dot = FALSE;
2096 if (sender_address == NULL)
2098 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2099 return EXIT_FAILURE;
2102 sender_address_forced = TRUE;
2106 /* This is some Sendmail thing which can be ignored */
2111 /* -h: Set the hop count for an incoming message. Exim does not currently
2112 support this; it always computes it by counting the Received: headers.
2113 To put it in will require a change to the spool header file format. */
2118 if(++i < argc) argrest = argv[i]; else
2119 { badarg = TRUE; break; }
2121 if (!isdigit(*argrest)) badarg = TRUE;
2125 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2126 not to be documented for sendmail but mailx (at least) uses it) */
2129 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2134 receiving_message = FALSE;
2136 /* -MC: continue delivery of another message via an existing open
2137 file descriptor. This option is used for an internal call by the
2138 smtp transport when there is a pending message waiting to go to an
2139 address to which it has got a connection. Five subsequent arguments are
2140 required: transport name, host name, IP address, sequence number, and
2141 message_id. Transports may decline to create new processes if the sequence
2142 number gets too big. The channel is stdin. This (-MC) must be the last
2143 argument. There's a subsequent check that the real-uid is privileged.
2145 If we are running in the test harness. delay for a bit, to let the process
2146 that set this one up complete. This makes for repeatability of the logging,
2149 if (Ustrcmp(argrest, "C") == 0)
2153 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2154 return EXIT_FAILURE;
2157 if (msg_action_arg >= 0)
2159 fprintf(stderr, "exim: incompatible arguments\n");
2160 return EXIT_FAILURE;
2163 continue_transport = argv[++i];
2164 continue_hostname = argv[++i];
2165 continue_host_address = argv[++i];
2166 continue_sequence = Uatoi(argv[++i]);
2167 msg_action = MSG_DELIVER;
2168 msg_action_arg = ++i;
2169 forced_delivery = TRUE;
2170 queue_run_pid = passed_qr_pid;
2171 queue_run_pipe = passed_qr_pipe;
2173 if (!mac_ismsgid(argv[i]))
2175 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2177 return EXIT_FAILURE;
2180 if (running_in_test_harness) millisleep(500);
2184 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2185 precedes -MC (see above). The flag indicates that the host to which
2186 Exim is connected has accepted an AUTH sequence. */
2188 else if (Ustrcmp(argrest, "CA") == 0)
2190 smtp_authenticated = TRUE;
2194 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2195 it preceded -MC (see above) */
2197 else if (Ustrcmp(argrest, "CP") == 0)
2199 smtp_use_pipelining = TRUE;
2203 /* -MCQ: pass on the pid of the queue-running process that started
2204 this chain of deliveries and the fd of its synchronizing pipe; this
2205 is useful only when it precedes -MC (see above) */
2207 else if (Ustrcmp(argrest, "CQ") == 0)
2209 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2211 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2216 /* -MCS: set the smtp_use_size flag; this is useful only when it
2217 precedes -MC (see above) */
2219 else if (Ustrcmp(argrest, "CS") == 0)
2221 smtp_use_size = TRUE;
2225 /* -MCT: set the tls_offered flag; this is useful only when it
2226 precedes -MC (see above). The flag indicates that the host to which
2227 Exim is connected has offered TLS support. */
2230 else if (Ustrcmp(argrest, "CT") == 0)
2237 /* -M[x]: various operations on the following list of message ids:
2238 -M deliver the messages, ignoring next retry times and thawing
2239 -Mc deliver the messages, checking next retry times, no thawing
2240 -Mf freeze the messages
2241 -Mg give up on the messages
2242 -Mt thaw the messages
2243 -Mrm remove the messages
2244 In the above cases, this must be the last option. There are also the
2245 following options which are followed by a single message id, and which
2246 act on that message. Some of them use the "recipient" addresses as well.
2247 -Mar add recipient(s)
2248 -Mmad mark all recipients delivered
2249 -Mmd mark recipients(s) delivered
2256 else if (*argrest == 0)
2258 msg_action = MSG_DELIVER;
2259 forced_delivery = deliver_force_thaw = TRUE;
2261 else if (Ustrcmp(argrest, "ar") == 0)
2263 msg_action = MSG_ADD_RECIPIENT;
2264 one_msg_action = TRUE;
2266 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2267 else if (Ustrcmp(argrest, "es") == 0)
2269 msg_action = MSG_EDIT_SENDER;
2270 one_msg_action = TRUE;
2272 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2273 else if (Ustrcmp(argrest, "g") == 0)
2275 msg_action = MSG_DELIVER;
2276 deliver_give_up = TRUE;
2278 else if (Ustrcmp(argrest, "mad") == 0)
2280 msg_action = MSG_MARK_ALL_DELIVERED;
2282 else if (Ustrcmp(argrest, "md") == 0)
2284 msg_action = MSG_MARK_DELIVERED;
2285 one_msg_action = TRUE;
2287 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2288 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2289 else if (Ustrcmp(argrest, "vb") == 0)
2291 msg_action = MSG_SHOW_BODY;
2292 one_msg_action = TRUE;
2294 else if (Ustrcmp(argrest, "vh") == 0)
2296 msg_action = MSG_SHOW_HEADER;
2297 one_msg_action = TRUE;
2299 else if (Ustrcmp(argrest, "vl") == 0)
2301 msg_action = MSG_SHOW_LOG;
2302 one_msg_action = TRUE;
2304 else { badarg = TRUE; break; }
2306 /* All the -Mxx options require at least one message id. */
2308 msg_action_arg = i + 1;
2309 if (msg_action_arg >= argc)
2311 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2312 return EXIT_FAILURE;
2315 /* Some require only message ids to follow */
2317 if (!one_msg_action)
2320 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2322 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2324 return EXIT_FAILURE;
2326 goto END_ARG; /* Remaining args are ids */
2329 /* Others require only one message id, possibly followed by addresses,
2330 which will be handled as normal arguments. */
2334 if (!mac_ismsgid(argv[msg_action_arg]))
2336 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2337 argv[msg_action_arg], arg);
2338 return EXIT_FAILURE;
2345 /* Some programs seem to call the -om option without the leading o;
2346 for sendmail it askes for "me too". Exim always does this. */
2349 if (*argrest != 0) badarg = TRUE;
2353 /* -N: don't do delivery - a debugging option that stops transports doing
2354 their thing. It implies debugging at the D_v level. */
2359 dont_deliver = TRUE;
2360 debug_selector |= D_v;
2361 debug_file = stderr;
2367 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2373 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2374 option to the specified value. This form uses long names. We need to handle
2375 -O option=value and -Ooption=value. */
2382 fprintf(stderr, "exim: string expected after -O\n");
2390 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2393 if (*argrest == 'A')
2395 alias_arg = argrest + 1;
2396 if (alias_arg[0] == 0)
2398 if (i+1 < argc) alias_arg = argv[++i]; else
2400 fprintf(stderr, "exim: string expected after -oA\n");
2406 /* -oB: Set a connection message max value for remote deliveries */
2408 else if (*argrest == 'B')
2410 uschar *p = argrest + 1;
2413 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2415 connection_max_messages = 1;
2424 fprintf(stderr, "exim: number expected after -oB\n");
2427 connection_max_messages = Uatoi(p);
2431 /* -odb: background delivery */
2433 else if (Ustrcmp(argrest, "db") == 0)
2435 synchronous_delivery = FALSE;
2436 arg_queue_only = FALSE;
2437 queue_only_set = TRUE;
2440 /* -odf: foreground delivery (smail-compatible option); same effect as
2441 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2444 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2446 synchronous_delivery = TRUE;
2447 arg_queue_only = FALSE;
2448 queue_only_set = TRUE;
2451 /* -odq: queue only */
2453 else if (Ustrcmp(argrest, "dq") == 0)
2455 synchronous_delivery = FALSE;
2456 arg_queue_only = TRUE;
2457 queue_only_set = TRUE;
2460 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2461 but no remote delivery */
2463 else if (Ustrcmp(argrest, "dqs") == 0)
2466 arg_queue_only = FALSE;
2467 queue_only_set = TRUE;
2470 /* -oex: Sendmail error flags. As these are also accepted without the
2471 leading -o prefix, for compatibility with vacation and other callers,
2472 they are handled with -e above. */
2474 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2475 -oitrue: Another sendmail syntax for the same */
2477 else if (Ustrcmp(argrest, "i") == 0 ||
2478 Ustrcmp(argrest, "itrue") == 0)
2481 /* -oM*: Set various characteristics for an incoming message; actually
2482 acted on for trusted callers only. */
2484 else if (*argrest == 'M')
2488 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2492 /* -oMa: Set sender host address */
2494 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2496 /* -oMaa: Set authenticator name */
2498 else if (Ustrcmp(argrest, "Maa") == 0)
2499 sender_host_authenticated = argv[++i];
2501 /* -oMas: setting authenticated sender */
2503 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2505 /* -oMai: setting authenticated id */
2507 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2509 /* -oMi: Set incoming interface address */
2511 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2513 /* -oMr: Received protocol */
2515 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2517 /* -oMs: Set sender host name */
2519 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2521 /* -oMt: Set sender ident */
2523 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2525 /* Else a bad argument */
2534 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2535 seem to call this as -m (undocumented), so that is also accepted (see
2538 else if (Ustrcmp(argrest, "m") == 0) {}
2540 /* -oo: An ancient flag for old-style addresses which still seems to
2541 crop up in some calls (see in SCO). */
2543 else if (Ustrcmp(argrest, "o") == 0) {}
2545 /* -oP <name>: set pid file path for daemon */
2547 else if (Ustrcmp(argrest, "P") == 0)
2548 override_pid_file_path = argv[++i];
2550 /* -or <n>: set timeout for non-SMTP acceptance
2551 -os <n>: set timeout for SMTP acceptance */
2553 else if (*argrest == 'r' || *argrest == 's')
2555 int *tp = (*argrest == 'r')?
2556 &arg_receive_timeout : &arg_smtp_receive_timeout;
2557 if (argrest[1] == 0)
2559 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2561 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2564 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2569 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2571 else if (Ustrcmp(argrest, "X") == 0)
2572 override_local_interfaces = argv[++i];
2574 /* Unknown -o argument */
2580 /* -ps: force Perl startup; -pd force delayed Perl startup */
2584 if (*argrest == 's' && argrest[1] == 0)
2586 perl_start_option = 1;
2589 if (*argrest == 'd' && argrest[1] == 0)
2591 perl_start_option = -1;
2596 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2597 which sets the host protocol and host name */
2601 if (i+1 < argc) argrest = argv[++i]; else
2602 { badarg = TRUE; break; }
2607 uschar *hn = Ustrchr(argrest, ':');
2610 received_protocol = argrest;
2614 received_protocol = string_copyn(argrest, hn - argrest);
2615 sender_host_name = hn + 1;
2622 receiving_message = FALSE;
2624 /* -qq...: Do queue runs in a 2-stage manner */
2626 if (*argrest == 'q')
2628 queue_2stage = TRUE;
2632 /* -qi...: Do only first (initial) deliveries */
2634 if (*argrest == 'i')
2636 queue_run_first_delivery = TRUE;
2640 /* -qf...: Run the queue, forcing deliveries
2641 -qff..: Ditto, forcing thawing as well */
2643 if (*argrest == 'f')
2645 queue_run_force = TRUE;
2646 if (*(++argrest) == 'f')
2648 deliver_force_thaw = TRUE;
2653 /* -q[f][f]l...: Run the queue only on local deliveries */
2655 if (*argrest == 'l')
2657 queue_run_local = TRUE;
2661 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2662 optionally starting from a given message id. */
2664 if (*argrest == 0 &&
2665 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2668 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2669 start_queue_run_id = argv[++i];
2670 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2671 stop_queue_run_id = argv[++i];
2674 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2675 optionally local only. */
2680 queue_interval = readconf_readtime(argrest, 0, FALSE);
2682 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2683 if (queue_interval <= 0)
2685 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2692 case 'R': /* Synonymous with -qR... */
2693 receiving_message = FALSE;
2695 /* -Rf: As -R (below) but force all deliveries,
2696 -Rff: Ditto, but also thaw all frozen messages,
2697 -Rr: String is regex
2698 -Rrf: Regex and force
2699 -Rrff: Regex and force and thaw
2701 in all cases provided there are no further characters in this
2707 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2709 if (Ustrcmp(argrest, rsopts[i]) == 0)
2711 if (i != 2) queue_run_force = TRUE;
2712 if (i >= 2) deliver_selectstring_regex = TRUE;
2713 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2714 argrest += Ustrlen(rsopts[i]);
2719 /* -R: Set string to match in addresses for forced queue run to
2720 pick out particular messages. */
2724 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2726 fprintf(stderr, "exim: string expected after -R\n");
2730 else deliver_selectstring = argrest;
2731 if (queue_interval < 0) queue_interval = 0;
2735 /* -r: an obsolete synonym for -f (see above) */
2738 /* -S: Like -R but works on sender. */
2740 case 'S': /* Synonymous with -qS... */
2741 receiving_message = FALSE;
2743 /* -Sf: As -S (below) but force all deliveries,
2744 -Sff: Ditto, but also thaw all frozen messages,
2745 -Sr: String is regex
2746 -Srf: Regex and force
2747 -Srff: Regex and force and thaw
2749 in all cases provided there are no further characters in this
2755 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2757 if (Ustrcmp(argrest, rsopts[i]) == 0)
2759 if (i != 2) queue_run_force = TRUE;
2760 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2761 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2762 argrest += Ustrlen(rsopts[i]);
2767 /* -S: Set string to match in addresses for forced queue run to
2768 pick out particular messages. */
2772 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2774 fprintf(stderr, "exim: string expected after -S\n");
2778 else deliver_selectstring_sender = argrest;
2779 if (queue_interval < 0) queue_interval = 0;
2782 /* -Tqt is an option that is exclusively for use by the testing suite.
2783 It is not recognized in other circumstances. It allows for the setting up
2784 of explicit "queue times" so that various warning/retry things can be
2785 tested. Otherwise variability of clock ticks etc. cause problems. */
2788 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2789 fudged_queue_times = argv[++i];
2794 /* -t: Set flag to extract recipients from body of message. */
2797 if (*argrest == 0) extract_recipients = TRUE;
2799 /* -ti: Set flag to extract recipients from body of message, and also
2800 specify that dot does not end the message. */
2802 else if (Ustrcmp(argrest, "i") == 0)
2804 extract_recipients = TRUE;
2808 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2811 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2818 /* -U: This means "initial user submission" in sendmail, apparently. The
2819 doc claims that in future sendmail may refuse syntactically invalid
2820 messages instead of fixing them. For the moment, we just ignore it. */
2826 /* -v: verify things - this is a very low-level debugging */
2831 debug_selector |= D_v;
2832 debug_file = stderr;
2838 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2840 The -x flag tells the sendmail command that mail from a local
2841 mail program has National Language Support (NLS) extended characters
2842 in the body of the mail item. The sendmail command can send mail with
2843 extended NLS characters across networks that normally corrupts these
2846 As Exim is 8-bit clean, it just ignores this flag. */
2849 if (*argrest != 0) badarg = TRUE;
2852 /* All other initial characters are errors */
2857 } /* End of high-level switch statement */
2859 /* Failed to recognize the option, or syntax error */
2863 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2864 "option %s\n", arg);
2870 /* Arguments have been processed. Check for incompatibilities. */
2874 (smtp_input || extract_recipients || recipients_arg < argc) &&
2875 (daemon_listen || queue_interval >= 0 || bi_option ||
2876 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2877 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2880 msg_action_arg > 0 &&
2881 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2882 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2885 (daemon_listen || queue_interval >= 0) &&
2886 (sender_address != NULL || list_options || list_queue || checking ||
2890 daemon_listen && queue_interval == 0
2894 (checking || smtp_input || extract_recipients ||
2895 filter_test != FTEST_NONE || bi_option)
2898 verify_address_mode &&
2899 (address_test_mode || smtp_input || extract_recipients ||
2900 filter_test != FTEST_NONE || bi_option)
2903 address_test_mode && (smtp_input || extract_recipients ||
2904 filter_test != FTEST_NONE || bi_option)
2907 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2911 deliver_selectstring != NULL && queue_interval < 0
2915 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2919 /* If debugging is set up, set the file and the file descriptor to pass on to
2920 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2921 to run in the foreground. */
2923 if (debug_selector != 0)
2925 debug_file = stderr;
2926 debug_fd = fileno(debug_file);
2927 background_daemon = FALSE;
2928 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2929 if (debug_selector != D_v) /* -v only doesn't show this */
2931 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2932 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2934 show_whats_supported(stderr);
2938 /* When started with root privilege, ensure that the limits on the number of
2939 open files and the number of processes (where that is accessible) are
2940 sufficiently large, or are unset, in case Exim has been called from an
2941 environment where the limits are screwed down. Not all OS have the ability to
2942 change some of these limits. */
2946 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2952 #ifdef RLIMIT_NOFILE
2953 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2955 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2957 rlp.rlim_cur = rlp.rlim_max = 0;
2960 /* I originally chose 1000 as a nice big number that was unlikely to
2961 be exceeded. It turns out that some older OS have a fixed upper limit of
2964 if (rlp.rlim_cur < 1000)
2966 rlp.rlim_cur = rlp.rlim_max = 1000;
2967 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2969 rlp.rlim_cur = rlp.rlim_max = 256;
2970 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2971 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2978 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2980 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2982 rlp.rlim_cur = rlp.rlim_max = 0;
2985 #ifdef RLIM_INFINITY
2986 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2988 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2990 if (rlp.rlim_cur < 1000)
2992 rlp.rlim_cur = rlp.rlim_max = 1000;
2994 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2995 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3001 /* Exim is normally entered as root (but some special configurations are
3002 possible that don't do this). However, it always spins off sub-processes that
3003 set their uid and gid as required for local delivery. We don't want to pass on
3004 any extra groups that root may belong to, so we want to get rid of them all at
3007 We need to obey setgroups() at this stage, before possibly giving up root
3008 privilege for a changed configuration file, but later on we might need to
3009 check on the additional groups for the admin user privilege - can't do that
3010 till after reading the config, which might specify the exim gid. Therefore,
3011 save the group list here first. */
3013 group_count = getgroups(NGROUPS_MAX, group_list);
3015 /* There is a fundamental difference in some BSD systems in the matter of
3016 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3017 known not to be different. On the "different" systems there is a single group
3018 list, and the first entry in it is the current group. On all other versions of
3019 Unix there is a supplementary group list, which is in *addition* to the current
3020 group. Consequently, to get rid of all extraneous groups on a "standard" system
3021 you pass over 0 groups to setgroups(), while on a "different" system you pass
3022 over a single group - the current group, which is always the first group in the
3023 list. Calling setgroups() with zero groups on a "different" system results in
3024 an error return. The following code should cope with both types of system.
3026 However, if this process isn't running as root, setgroups() can't be used
3027 since you have to be root to run it, even if throwing away groups. Not being
3028 root here happens only in some unusual configurations. We just ignore the
3031 if (setgroups(0, NULL) != 0)
3033 if (setgroups(1, group_list) != 0 && !unprivileged)
3035 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3040 /* If the configuration file name has been altered by an argument on the
3041 command line (either a new file name or a macro definition) and the caller is
3042 not root or the exim user, or if this is a filter testing run, remove any
3043 setuid privilege the program has, and run as the underlying user.
3045 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3046 severely restricts the use of -C for some purposes.
3048 Otherwise, set the real ids to the effective values (should be root unless run
3049 from inetd, which it can either be root or the exim uid, if one is configured).
3051 There is a private mechanism for bypassing some of this, in order to make it
3052 possible to test lots of configurations automatically, without having either to
3053 recompile each time, or to patch in an actual configuration file name and other
3054 values (such as the path name). If running in the test harness, pretend that
3055 configuration file changes and macro definitions haven't happened. */
3058 (config_changed || macros != NULL) && /* Config changed, and */
3059 real_uid != root_uid && /* Not root, and */
3060 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3061 real_uid != exim_uid && /* Not exim, and */
3063 !running_in_test_harness /* Not fudged */
3065 expansion_test /* expansion testing */
3067 filter_test != FTEST_NONE) /* Filter testing */
3069 setgroups(group_count, group_list);
3070 exim_setugid(real_uid, real_gid, FALSE,
3071 US"-C, -D, -be or -bf forces real uid");
3072 removed_privilege = TRUE;
3074 /* In the normal case when Exim is called like this, stderr is available
3075 and should be used for any logging information because attempts to write
3076 to the log will usually fail. To arrange this, we unset really_exim. However,
3077 if no stderr is available there is no point - we might as well have a go
3078 at the log (if it fails, syslog will be written). */
3080 if (log_stderr != NULL) really_exim = FALSE;
3083 /* Privilege is to be retained for the moment. It may be dropped later,
3084 depending on the job that this Exim process has been asked to do. For now, set
3085 the real uid to the effective so that subsequent re-execs of Exim are done by a
3088 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3090 /* If testing a filter, open the file(s) now, before wasting time doing other
3091 setups and reading the message. */
3093 if ((filter_test & FTEST_SYSTEM) != 0)
3095 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3098 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3100 return EXIT_FAILURE;
3104 if ((filter_test & FTEST_USER) != 0)
3106 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3109 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3111 return EXIT_FAILURE;
3115 /* Read the main runtime configuration data; this gives up if there
3116 is a failure. It leaves the configuration file open so that the subsequent
3117 configuration data for delivery can be read if needed. */
3121 /* Handle the decoding of logging options. */
3123 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3124 log_options, log_options_count, US"log");
3128 debug_printf("configuration file is %s\n", config_main_filename);
3129 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3130 log_extra_selector);
3133 /* If domain literals are not allowed, check the sender address that was
3134 supplied with -f. Ditto for a stripped trailing dot. */
3136 if (sender_address != NULL)
3138 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3140 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3141 "allowed\n", sender_address);
3142 return EXIT_FAILURE;
3144 if (f_end_dot && !strip_trailing_dot)
3146 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3147 "(trailing dot not allowed)\n", sender_address);
3148 return EXIT_FAILURE;
3152 /* Paranoia check of maximum lengths of certain strings. There is a check
3153 on the length of the log file path in log.c, which will come into effect
3154 if there are any calls to write the log earlier than this. However, if we
3155 get this far but the string is very long, it is better to stop now than to
3156 carry on and (e.g.) receive a message and then have to collapse. The call to
3157 log_write() from here will cause the ultimate panic collapse if the complete
3158 file name exceeds the buffer length. */
3160 if (Ustrlen(log_file_path) > 200)
3161 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3162 "log_file_path is longer than 200 chars: aborting");
3164 if (Ustrlen(pid_file_path) > 200)
3165 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3166 "pid_file_path is longer than 200 chars: aborting");
3168 if (Ustrlen(spool_directory) > 200)
3169 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3170 "spool_directory is longer than 200 chars: aborting");
3172 /* Length check on the process name given to syslog for its TAG field,
3173 which is only permitted to be 32 characters or less. See RFC 3164. */
3175 if (Ustrlen(syslog_processname) > 32)
3176 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3177 "syslog_processname is longer than 32 chars: aborting");
3179 /* In some operating systems, the environment variable TMPDIR controls where
3180 temporary files are created; Exim doesn't use these (apart from when delivering
3181 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3182 If TMPDIR is found in the environment, reset it to the value defined in the
3183 TMPDIR macro, if this macro is defined. */
3188 for (p = USS environ; *p != NULL; p++)
3190 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3191 Ustrcmp(*p+7, TMPDIR) != 0)
3193 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3194 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3196 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3202 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3203 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3204 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3205 called by a user who has set the TZ variable. This then affects the timestamps
3206 in log files and in Received: headers, and any created Date: header lines. The
3207 required timezone is settable in the configuration file, so nothing can be done
3208 about this earlier - but hopefully nothing will normally be logged earlier than
3209 this. We have to make a new environment if TZ is wrong, but don't bother if
3210 timestamps_utc is set, because then all times are in UTC anyway. */
3212 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3214 timestamps_utc = TRUE;
3218 uschar *envtz = US getenv("TZ");
3219 if ((envtz == NULL && timezone_string != NULL) ||
3221 (timezone_string == NULL ||
3222 Ustrcmp(timezone_string, envtz) != 0)))
3224 uschar **p = USS environ;
3228 while (*p++ != NULL) count++;
3229 if (envtz == NULL) count++;
3230 newp = new = malloc(sizeof(uschar *) * (count + 1));
3231 for (p = USS environ; *p != NULL; p++)
3233 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3236 if (timezone_string != NULL)
3238 *newp = malloc(Ustrlen(timezone_string) + 4);
3239 sprintf(CS *newp++, "TZ=%s", timezone_string);
3244 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3245 tod_stamp(tod_log));
3249 /* Handle the case when we have removed the setuid privilege because of -C or
3250 -D. This means that the caller of Exim was not root, and, provided that
3251 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3254 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3255 were running as the exim user defined in the configuration file (different to
3256 the one in the binary). The sysadmin may expect this case to retain privilege
3257 because "the binary was called by the Exim user", but it hasn't, because of the
3258 order in which it handles this stuff. There are two possibilities:
3260 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3261 to do message deliveries. Thus, the fact that it is running as a
3262 non-privileged user is plausible, and might be wanted in some special
3263 configurations. However, really_exim will have been set false when
3264 privilege was dropped, to stop Exim trying to write to its normal log
3265 files. Therefore, re-enable normal log processing, assuming the sysadmin
3266 has set up the log directory correctly.
3268 (2) If deliver_drop_privilege is not set, the configuration won't work as
3269 apparently intended, and so we log a panic message. In order to retain
3270 root for -C or -D, the caller must either be root or the Exim user
3271 defined in the binary (when deliver_drop_ privilege is false).
3273 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3274 built-in exim user or one defined in the configuration. In either event,
3275 re-enable log processing, assuming the sysadmin knows what they are doing. */
3277 if (removed_privilege && (config_changed || macros != NULL) &&
3278 real_uid == exim_uid)
3280 #ifdef ALT_CONFIG_ROOT_ONLY
3281 really_exim = TRUE; /* let logging work normally */
3284 if (deliver_drop_privilege)
3285 really_exim = TRUE; /* let logging work normally */
3287 log_write(0, LOG_MAIN|LOG_PANIC,
3288 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3289 (int)exim_uid, config_changed? "-C" : "-D");
3293 /* Start up Perl interpreter if Perl support is configured and there is a
3294 perl_startup option, and the configuration or the command line specifies
3295 initializing starting. Note that the global variables are actually called
3296 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3299 if (perl_start_option != 0)
3300 opt_perl_at_start = (perl_start_option > 0);
3301 if (opt_perl_at_start && opt_perl_startup != NULL)
3304 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3305 errstr = init_perl(opt_perl_startup);
3308 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3309 return EXIT_FAILURE;
3311 opt_perl_started = TRUE;
3313 #endif /* EXIM_PERL */
3315 /* Log the arguments of the call if the configuration file said so. This is
3316 a debugging feature for finding out what arguments certain MUAs actually use.
3317 Don't attempt it if logging is disabled, or if listing variables or if
3318 verifying/testing addresses or expansions. */
3320 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3321 && really_exim && !list_options && !checking)
3324 uschar *p = big_buffer;
3326 (void)getcwd(CS p+4, big_buffer_size - 4);
3328 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3330 for (i = 0; i < argc; i++)
3332 int len = Ustrlen(argv[i]);
3335 if (p + len + 8 >= big_buffer + big_buffer_size)
3338 log_write(0, LOG_MAIN, "%s", big_buffer);
3339 Ustrcpy(big_buffer, "...");
3342 printing = string_printing(argv[i]);
3343 if (printing[0] == 0) quote = US"\""; else
3345 uschar *pp = printing;
3347 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3349 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3350 (p - big_buffer) - 4), printing, quote);
3354 if ((log_extra_selector & LX_arguments) != 0)
3355 log_write(0, LOG_MAIN, "%s", big_buffer);
3357 debug_printf("%s\n", big_buffer);
3360 /* Set the working directory to be the top-level spool directory. We don't rely
3361 on this in the code, which always uses fully qualified names, but it's useful
3362 for core dumps etc. Don't complain if it fails - the spool directory might not
3363 be generally accessible and calls with the -C option (and others) have lost
3364 privilege by now. Before the chdir, we try to ensure that the directory exists.
3367 if (Uchdir(spool_directory) != 0)
3369 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3370 (void)Uchdir(spool_directory);
3373 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3374 alias file. Exim doesn't have such a concept, but this call is screwed into
3375 Sun's YP makefiles. Handle this by calling a configured script, as the real
3376 user who called Exim. The -oA option can be used to pass an argument to the
3381 (void)fclose(config_file);
3382 if (bi_command != NULL)
3386 argv[i++] = bi_command;
3387 if (alias_arg != NULL) argv[i++] = alias_arg;
3390 setgroups(group_count, group_list);
3391 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3393 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3394 (argv[1] == NULL)? US"" : argv[1]);
3396 execv(CS argv[0], (char *const *)argv);
3397 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3402 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3407 /* If an action on specific messages is requested, or if a daemon or queue
3408 runner is being started, we need to know if Exim was called by an admin user.
3409 This is the case if the real user is root or exim, or if the real group is
3410 exim, or if one of the supplementary groups is exim or a group listed in
3411 admin_groups. We don't fail all message actions immediately if not admin_user,
3412 since some actions can be performed by non-admin users. Instead, set admin_user
3413 for later interrogation. */
3415 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3421 for (i = 0; i < group_count; i++)
3423 if (group_list[i] == exim_gid) admin_user = TRUE;
3424 else if (admin_groups != NULL)
3426 for (j = 1; j <= (int)(admin_groups[0]); j++)
3427 if (admin_groups[j] == group_list[i])
3428 { admin_user = TRUE; break; }
3430 if (admin_user) break;
3434 /* Another group of privileged users are the trusted users. These are root,
3435 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3436 are permitted to specify sender_addresses with -f on the command line, and
3437 other message parameters as well. */
3439 if (real_uid == root_uid || real_uid == exim_uid)
3440 trusted_caller = TRUE;
3445 if (trusted_users != NULL)
3447 for (i = 1; i <= (int)(trusted_users[0]); i++)
3448 if (trusted_users[i] == real_uid)
3449 { trusted_caller = TRUE; break; }
3452 if (!trusted_caller && trusted_groups != NULL)
3454 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3456 if (trusted_groups[i] == real_gid)
3457 trusted_caller = TRUE;
3458 else for (j = 0; j < group_count; j++)
3460 if (trusted_groups[i] == group_list[j])
3461 { trusted_caller = TRUE; break; }
3463 if (trusted_caller) break;
3468 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3469 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3471 /* Only an admin user may start the daemon or force a queue run in the default
3472 configuration, but the queue run restriction can be relaxed. Only an admin
3473 user may request that a message be returned to its sender forthwith. Only an
3474 admin user may specify a debug level greater than D_v (because it might show
3475 passwords, etc. in lookup queries). Only an admin user may request a queue
3480 BOOL debugset = (debug_selector & ~D_v) != 0;
3481 if (deliver_give_up || daemon_listen ||
3482 (count_queue && queue_list_requires_admin) ||
3483 (list_queue && queue_list_requires_admin) ||
3484 (queue_interval >= 0 && prod_requires_admin) ||
3485 (debugset && !running_in_test_harness))
3487 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3492 /* If the real user is not root or the exim uid, the argument for passing
3493 in an open TCP/IP connection for another message is not permitted, nor is
3494 running with the -N option for any delivery action, unless this call to exim is
3495 one that supplied an input message, or we are using a patched exim for
3496 regression testing. */
3498 if (real_uid != root_uid && real_uid != exim_uid &&
3499 (continue_hostname != NULL ||
3501 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3502 )) && !running_in_test_harness)
3504 fprintf(stderr, "exim: Permission denied\n");
3505 return EXIT_FAILURE;
3508 /* If the caller is not trusted, certain arguments are ignored when running for
3509 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3510 Note that authority for performing certain actions on messages is tested in the
3511 queue_action() function. */
3513 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3515 sender_host_name = sender_host_address = interface_address =
3516 sender_ident = received_protocol = NULL;
3517 sender_host_port = interface_port = 0;
3518 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3521 /* If a sender host address is set, extract the optional port number off the
3522 end of it and check its syntax. Do the same thing for the interface address.
3523 Exim exits if the syntax is bad. */
3527 if (sender_host_address != NULL)
3528 sender_host_port = check_port(sender_host_address);
3529 if (interface_address != NULL)
3530 interface_port = check_port(interface_address);
3533 /* If an SMTP message is being received check to see if the standard input is a
3534 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3535 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3540 union sockaddr_46 inetd_sock;
3541 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3542 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3544 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3545 if (family == AF_INET || family == AF_INET6)
3547 union sockaddr_46 interface_sock;
3548 size = sizeof(interface_sock);
3550 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3551 interface_address = host_ntoa(-1, &interface_sock, NULL,
3554 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3556 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3559 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3560 NULL, &sender_host_port);
3561 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3562 "inetd is not supported when mua_wrapper is set");
3567 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3568 return EXIT_FAILURE;
3574 /* If the load average is going to be needed while receiving a message, get it
3575 now for those OS that require the first call to os_getloadavg() to be done as
3576 root. There will be further calls later for each message received. */
3578 #ifdef LOAD_AVG_NEEDS_ROOT
3579 if (receiving_message &&
3580 (queue_only_load >= 0 ||
3581 (is_inetd && smtp_load_reserve >= 0)
3584 load_average = os_getloadavg();
3588 /* The queue_only configuration option can be overridden by -odx on the command
3589 line, except that if queue_only_override is false, queue_only cannot be unset
3590 from the command line. */
3592 if (queue_only_set && (queue_only_override || arg_queue_only))
3593 queue_only = arg_queue_only;
3595 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3598 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3599 if (arg_smtp_receive_timeout >= 0)
3600 smtp_receive_timeout = arg_smtp_receive_timeout;
3602 /* If Exim was started with root privilege, unless we have already removed the
3603 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3604 except when starting the daemon or doing some kind of delivery or address
3605 testing (-bt). These are the only cases when root need to be retained. We run
3606 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3607 retained only for starting the daemon. We always do the initgroups() in this
3608 situation (controlled by the TRUE below), in order to be as close as possible
3609 to the state Exim usually runs in. */
3611 if (!unprivileged && /* originally had root AND */
3612 !removed_privilege && /* still got root AND */
3613 !daemon_listen && /* not starting the daemon */
3614 queue_interval <= 0 && /* (either kind of daemon) */
3616 deliver_drop_privilege || /* requested unprivileged */
3618 queue_interval < 0 && /* not running the queue */
3619 (msg_action_arg < 0 || /* and */
3620 msg_action != MSG_DELIVER) && /* not delivering and */
3621 (!checking || !address_test_mode) /* not address checking */
3625 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3628 /* When we are retaining a privileged uid, we still change to the exim gid. */
3630 else setgid(exim_gid);
3632 /* Handle a request to list the delivery queue */
3636 set_process_info("listing the queue");
3637 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3641 /* Handle a request to count the delivery queue */
3645 set_process_info("counting the queue");
3650 /* Handle actions on specific messages, except for the force delivery action,
3651 which is done below. Some actions take a whole list of message ids, which
3652 are known to continue up to the end of the arguments. Others take a single
3653 message id and then operate on the recipients list. */
3655 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3657 int yield = EXIT_SUCCESS;
3658 set_process_info("acting on specified messages");
3660 if (!one_msg_action)
3662 for (i = msg_action_arg; i < argc; i++)
3663 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3664 yield = EXIT_FAILURE;
3667 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3668 recipients_arg)) yield = EXIT_FAILURE;
3672 /* All the modes below here require the remaining configuration sections
3673 to be read, except that we can skip over the ACL setting when delivering
3674 specific messages, or doing a queue run. (For various testing cases we could
3675 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3678 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3680 /* The configuration data will have been read into POOL_PERM because we won't
3681 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3682 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3683 configuration were read into POOL_MAIN, because we don't do any resets till
3684 later on. However, it seems right, and it does ensure that both pools get used.
3687 store_pool = POOL_MAIN;
3689 /* Handle the -brt option. This is for checking out retry configurations.
3690 The next three arguments are a domain name or a complete address, and
3691 optionally two error numbers. All it does is to call the function that
3692 scans the retry configuration data. */
3694 if (test_retry_arg >= 0)
3696 retry_config *yield;
3697 int basic_errno = 0;
3701 if (test_retry_arg >= argc)
3703 printf("-brt needs a domain or address argument\n");
3704 exim_exit(EXIT_FAILURE);
3706 s1 = argv[test_retry_arg++];
3709 /* If the first argument contains no @ and no . it might be a local user
3710 or it might be a single-component name. Treat as a domain. */
3712 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3714 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3715 "being \ntreated as a one-component domain, not as a local part.\n\n",
3719 /* There may be an optional second domain arg. */
3721 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3722 s2 = argv[test_retry_arg++];
3724 /* The final arg is an error name */
3726 if (test_retry_arg < argc)
3728 uschar *ss = argv[test_retry_arg];
3730 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3733 printf("%s\n", CS error);
3734 return EXIT_FAILURE;
3737 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3738 code > 100 as an error is for matching codes to the decade. Turn them into
3739 a real error code, off the decade. */
3741 if (basic_errno == ERRNO_MAIL4XX ||
3742 basic_errno == ERRNO_RCPT4XX ||
3743 basic_errno == ERRNO_DATA4XX)
3745 int code = (more_errno >> 8) & 255;
3747 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3748 else if (code > 100)
3749 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3753 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3754 if (yield == NULL) printf("No retry information found\n"); else
3757 more_errno = yield->more_errno;
3758 printf("Retry rule: %s ", yield->pattern);
3760 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3762 printf("quota%s%s ",
3763 (more_errno > 0)? "_" : "",
3764 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3766 else if (yield->basic_errno == ECONNREFUSED)
3768 printf("refused%s%s ",
3769 (more_errno > 0)? "_" : "",
3770 (more_errno == 'M')? "MX" :
3771 (more_errno == 'A')? "A" : "");
3773 else if (yield->basic_errno == ETIMEDOUT)
3776 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3778 if (more_errno != 0) printf("_%s",
3779 (more_errno == 'M')? "MX" : "A");
3782 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3783 printf("auth_failed ");
3786 for (r = yield->rules; r != NULL; r = r->next)
3788 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3789 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3795 printf(",%d.", x/1000);
3809 exim_exit(EXIT_SUCCESS);
3812 /* Handle a request to list one or more configuration options */
3816 set_process_info("listing variables");
3817 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3818 else for (i = recipients_arg; i < argc; i++)
3821 (Ustrcmp(argv[i], "router") == 0 ||
3822 Ustrcmp(argv[i], "transport") == 0 ||
3823 Ustrcmp(argv[i], "authenticator") == 0))
3825 readconf_print(argv[i+1], argv[i]);
3828 else readconf_print(argv[i], NULL);
3830 exim_exit(EXIT_SUCCESS);
3834 /* Handle a request to deliver one or more messages that are already on the
3835 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3836 is typically used for a small number when prodding by hand (when the option
3837 forced_delivery will be set) or when re-execing to regain root privilege.
3838 Each message delivery must happen in a separate process, so we fork a process
3839 for each one, and run them sequentially so that debugging output doesn't get
3840 intertwined, and to avoid spawning too many processes if a long list is given.
3841 However, don't fork for the last one; this saves a process in the common case
3842 when Exim is called to deliver just one message. */
3844 if (msg_action_arg > 0)
3846 if (prod_requires_admin && !admin_user)
3848 fprintf(stderr, "exim: Permission denied\n");
3849 exim_exit(EXIT_FAILURE);
3851 set_process_info("delivering specified messages");
3852 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3853 for (i = msg_action_arg; i < argc; i++)
3858 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3859 else if ((pid = fork()) == 0)
3861 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3862 _exit(EXIT_SUCCESS);
3866 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3868 exim_exit(EXIT_FAILURE);
3872 exim_exit(EXIT_SUCCESS);
3876 /* If only a single queue run is requested, without SMTP listening, we can just
3877 turn into a queue runner, with an optional starting message id. */
3879 if (queue_interval == 0 && !daemon_listen)
3881 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3882 (start_queue_run_id == NULL)? US"" : US" starting at ",
3883 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3884 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3885 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3886 set_process_info("running the queue (single queue run)");
3887 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3888 exim_exit(EXIT_SUCCESS);
3892 /* Find the login name of the real user running this process. This is always
3893 needed when receiving a message, because it is written into the spool file. It
3894 may also be used to construct a from: or a sender: header, and in this case we
3895 need the user's full name as well, so save a copy of it, checked for RFC822
3896 syntax and munged if necessary, if it hasn't previously been set by the -F
3897 argument. We may try to get the passwd entry more than once, in case NIS or
3898 other delays are in evidence. Save the home directory for use in filter testing
3903 if ((pw = getpwuid(real_uid)) != NULL)
3905 originator_login = string_copy(US pw->pw_name);
3906 originator_home = string_copy(US pw->pw_dir);
3908 /* If user name has not been set by -F, set it from the passwd entry
3909 unless -f has been used to set the sender address by a trusted user. */
3911 if (originator_name == NULL)
3913 if (sender_address == NULL ||
3914 (!trusted_caller && filter_test == FTEST_NONE))
3916 uschar *name = US pw->pw_gecos;
3917 uschar *amp = Ustrchr(name, '&');
3920 /* Most Unix specify that a '&' character in the gecos field is
3921 replaced by a copy of the login name, and some even specify that
3922 the first character should be upper cased, so that's what we do. */
3927 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3928 amp - name, name, &loffset, originator_login, amp + 1);
3929 buffer[loffset] = toupper(buffer[loffset]);
3933 /* If a pattern for matching the gecos field was supplied, apply
3934 it and then expand the name string. */
3936 if (gecos_pattern != NULL && gecos_name != NULL)
3939 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3941 if (regex_match_and_setup(re, name, 0, -1))
3943 uschar *new_name = expand_string(gecos_name);
3945 if (new_name != NULL)
3947 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3948 "gecos field \"%s\"\n", new_name, name);
3951 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3952 "\"%s\": %s\n", gecos_name, expand_string_message);
3954 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3955 "gecos field \"%s\"\n", gecos_pattern, name);
3956 store_free((void *)re);
3958 originator_name = string_copy(name);
3961 /* A trusted caller has used -f but not -F */
3963 else originator_name = US"";
3966 /* Break the retry loop */
3971 if (++i > finduser_retries) break;
3975 /* If we cannot get a user login, log the incident and give up, unless the
3976 configuration specifies something to use. When running in the test harness,
3977 any setting of unknown_login overrides the actual name. */
3979 if (originator_login == NULL || running_in_test_harness)
3981 if (unknown_login != NULL)
3983 originator_login = expand_string(unknown_login);
3984 if (originator_name == NULL && unknown_username != NULL)
3985 originator_name = expand_string(unknown_username);
3986 if (originator_name == NULL) originator_name = US"";
3988 if (originator_login == NULL)
3989 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3993 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3996 originator_name = string_copy(parse_fix_phrase(originator_name,
3997 Ustrlen(originator_name), big_buffer, big_buffer_size));
3999 /* If a message is created by this call of Exim, the uid/gid of its originator
4000 are those of the caller. These values are overridden if an existing message is
4001 read in from the spool. */
4003 originator_uid = real_uid;
4004 originator_gid = real_gid;
4006 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4007 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4009 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4010 returns. We leave this till here so that the originator_ fields are available
4011 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4014 if (daemon_listen || queue_interval > 0)
4018 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4019 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4020 "mua_wrapper is set");
4025 /* If the sender ident has not been set (by a trusted caller) set it to
4026 the caller. This will get overwritten below for an inetd call. If a trusted
4027 caller has set it empty, unset it. */
4029 if (sender_ident == NULL) sender_ident = originator_login;
4030 else if (sender_ident[0] == 0) sender_ident = NULL;
4032 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4033 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4034 originator_* variables set. */
4036 if (test_rewrite_arg >= 0)
4038 really_exim = FALSE;
4039 if (test_rewrite_arg >= argc)
4041 printf("-brw needs an address argument\n");
4042 exim_exit(EXIT_FAILURE);
4044 rewrite_test(argv[test_rewrite_arg]);
4045 exim_exit(EXIT_SUCCESS);
4048 /* A locally-supplied message is considered to be coming from a local user
4049 unless a trusted caller supplies a sender address with -f, or is passing in the
4050 message via SMTP (inetd invocation or otherwise). */
4052 if ((sender_address == NULL && !smtp_input) ||
4053 (!trusted_caller && filter_test == FTEST_NONE))
4055 sender_local = TRUE;
4057 /* A trusted caller can supply authenticated_sender and authenticated_id
4058 via -oMas and -oMai and if so, they will already be set. */
4060 if (authenticated_sender == NULL)
4061 authenticated_sender = string_sprintf("%s@%s", originator_login,
4062 qualify_domain_sender);
4063 if (authenticated_id == NULL) authenticated_id = originator_login;
4066 /* Trusted callers are always permitted to specify the sender address.
4067 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4068 is specified is the empty address. However, if a trusted caller does not
4069 specify a sender address for SMTP input, we leave sender_address unset. This
4070 causes the MAIL commands to be honoured. */
4072 if ((!smtp_input && sender_address == NULL) ||
4073 !receive_check_set_sender(sender_address))
4075 /* Either the caller is not permitted to set a general sender, or this is
4076 non-SMTP input and the trusted caller has not set a sender. If there is no
4077 sender, or if a sender other than <> is set, override with the originator's
4078 login (which will get qualified below), except when checking things. */
4080 if (sender_address == NULL /* No sender_address set */
4082 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4083 !checking && /* Not running tests, AND */
4084 filter_test == FTEST_NONE)) /* Not testing a filter */
4086 sender_address = originator_login;
4087 sender_address_forced = FALSE;
4088 sender_address_domain = 0;
4092 /* Remember whether an untrusted caller set the sender address */
4094 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4096 /* Ensure that the sender address is fully qualified unless it is the empty
4097 address, which indicates an error message, or doesn't exist (root caller, smtp
4098 interface, no -f argument). */
4100 if (sender_address != NULL && sender_address[0] != 0 &&
4101 sender_address_domain == 0)
4102 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4103 qualify_domain_sender);
4105 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4107 /* Handle a request to verify a list of addresses, or test them for delivery.
4108 This must follow the setting of the sender address, since routers can be
4109 predicated upon the sender. If no arguments are given, read addresses from
4110 stdin. Set debug_level to at least D_v to get full output for address testing.
4113 if (verify_address_mode || address_test_mode)
4116 int flags = vopt_qualify;
4118 if (verify_address_mode)
4120 if (!verify_as_sender) flags |= vopt_is_recipient;
4121 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4126 flags |= vopt_is_recipient;
4127 debug_selector |= D_v;
4128 debug_file = stderr;
4129 debug_fd = fileno(debug_file);
4130 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4133 if (recipients_arg < argc)
4135 while (recipients_arg < argc)
4137 uschar *s = argv[recipients_arg++];
4140 BOOL finished = FALSE;
4141 uschar *ss = parse_find_address_end(s, FALSE);
4142 if (*ss == ',') *ss = 0; else finished = TRUE;
4143 test_address(s, flags, &exit_value);
4146 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4153 uschar *s = get_stdinput(NULL, NULL);
4154 if (s == NULL) break;
4155 test_address(s, flags, &exit_value);
4159 exim_exit(exit_value);
4162 /* Handle expansion checking */
4166 if (recipients_arg < argc)
4168 while (recipients_arg < argc)
4170 uschar *s = argv[recipients_arg++];
4171 uschar *ss = expand_string(s);
4173 printf ("Failed: %s\n", expand_string_message);
4174 else printf("%s\n", CS ss);
4182 char *(*fn_readline)(char *) = NULL;
4183 char *(*fn_addhist)(char *) = NULL;
4186 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4192 uschar *source = get_stdinput(fn_readline, fn_addhist);
4193 if (source == NULL) break;
4194 ss = expand_string(source);
4196 printf ("Failed: %s\n", expand_string_message);
4197 else printf("%s\n", CS ss);
4201 if (dlhandle != NULL) dlclose(dlhandle);
4205 exim_exit(EXIT_SUCCESS);
4209 /* The active host name is normally the primary host name, but it can be varied
4210 for hosts that want to play several parts at once. We need to ensure that it is
4211 set for host checking, and for receiving messages. */
4213 smtp_active_hostname = primary_hostname;
4214 if (raw_active_hostname != NULL)
4216 uschar *nah = expand_string(raw_active_hostname);
4219 if (!expand_string_forcedfail)
4220 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4221 "(smtp_active_hostname): %s", raw_active_hostname,
4222 expand_string_message);
4224 else if (nah[0] != 0) smtp_active_hostname = nah;
4227 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4228 given IP address so that the blocking and relay configuration can be tested. An
4229 RFC 1413 call is made only if we are running in the test harness and an
4230 incoming interface and both ports are specified, because there is no TCP/IP
4231 call to find the ident for. */
4238 sender_ident = NULL;
4239 if (running_in_test_harness && sender_host_port != 0 &&
4240 interface_address != NULL && interface_port != 0)
4241 verify_get_ident(1413);
4243 /* In case the given address is a non-canonical IPv6 address, canonicize
4244 it. The code works for both IPv4 and IPv6, as it happens. */
4246 size = host_aton(sender_host_address, x);
4247 sender_host_address = store_get(48); /* large enough for full IPv6 */
4248 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4250 /* Now set up for testing */
4252 host_build_sender_fullhost();
4256 sender_local = FALSE;
4257 sender_host_notsocket = TRUE;
4258 debug_file = stderr;
4259 debug_fd = fileno(debug_file);
4260 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4261 "**** but without any ident (RFC 1413) callback.\n"
4262 "**** This is not for real!\n\n",
4263 sender_host_address);
4265 if (verify_check_host(&hosts_connection_nolog) == OK)
4266 log_write_selector &= ~L_smtp_connection;
4267 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4269 if (smtp_start_session())
4271 reset_point = store_get(0);
4274 store_reset(reset_point);
4275 if (smtp_setup_msg() <= 0) break;
4276 if (!receive_msg(FALSE)) break;
4279 exim_exit(EXIT_SUCCESS);
4283 /* Arrange for message reception if recipients or SMTP were specified;
4284 otherwise complain unless a version print (-bV) happened or this is a filter
4285 verification test. In the former case, show the configuration file name. */
4287 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4289 if (version_printed)
4291 printf("Configuration file is %s\n", config_main_filename);
4292 return EXIT_SUCCESS;
4294 if (filter_test == FTEST_NONE)
4297 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4298 "not directly from a shell command line. Options and/or arguments control\n"
4299 "what it does when called. For a list of options, see the Exim documentation.\n");
4300 return EXIT_FAILURE;
4305 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4306 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4307 that we are not called from inetd, because that is rejected above. The
4308 following configuration settings are forced here:
4310 (1) Synchronous delivery (-odi)
4311 (2) Errors to stderr (-oep == -oeq)
4312 (3) No parallel remote delivery
4313 (4) Unprivileged delivery
4315 We don't force overall queueing options because there are several of them;
4316 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4317 to override any SMTP queueing. */
4321 synchronous_delivery = TRUE;
4322 arg_error_handling = ERRORS_STDERR;
4323 remote_max_parallel = 1;
4324 deliver_drop_privilege = TRUE;
4326 queue_smtp_domains = NULL;
4330 /* Prepare to accept one or more new messages on the standard input. When a
4331 message has been read, its id is returned in message_id[]. If doing immediate
4332 delivery, we fork a delivery process for each received message, except for the
4333 last one, where we can save a process switch.
4335 It is only in non-smtp mode that error_handling is allowed to be changed from
4336 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4337 sendmail error modes other than -oem ever actually used? Later: yes.) */
4339 if (!smtp_input) error_handling = arg_error_handling;
4341 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4342 logging being sent down the socket and make an identd call to get the
4347 (void)fclose(stderr);
4348 exim_nullstd(); /* Re-open to /dev/null */
4349 verify_get_ident(IDENT_PORT);
4350 host_build_sender_fullhost();
4351 set_process_info("handling incoming connection from %s via inetd",
4355 /* If the sender host address has been set, build sender_fullhost if it hasn't
4356 already been done (which it will have been for inetd). This caters for the
4357 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4358 so that the test for IP options is skipped for -bs input. */
4360 if (sender_host_address != NULL && sender_fullhost == NULL)
4362 host_build_sender_fullhost();
4363 set_process_info("handling incoming connection from %s via -oMa",
4365 sender_host_notsocket = TRUE;
4368 /* Otherwise, set the sender host as unknown except for inetd calls. This
4369 prevents host checking in the case of -bs not from inetd and also for -bS. */
4371 else if (!is_inetd) sender_host_unknown = TRUE;
4373 /* If stdout does not exist, then dup stdin to stdout. This can happen
4374 if exim is started from inetd. In this case fd 0 will be set to the socket,
4375 but fd 1 will not be set. This also happens for passed SMTP channels. */
4377 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4379 /* Set up the incoming protocol name and the state of the program. Root
4380 is allowed to force received protocol via the -oMr option above, and if we are
4381 in a non-local SMTP state it means we have come via inetd and the process info
4382 has already been set up. We don't set received_protocol here for smtp input,
4383 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4387 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4392 if (received_protocol == NULL)
4393 received_protocol = string_sprintf("local%s", called_as);
4394 set_process_info("accepting a local non-SMTP message from <%s>",
4398 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4402 local_queue_only = queue_only;
4404 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4405 the spool if so configured. On failure, we must not attempt to send an error
4406 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4407 error code is given.) */
4409 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4411 fprintf(stderr, "exim: insufficient disk space\n");
4412 return EXIT_FAILURE;
4415 /* If this is smtp input of any kind, handle the start of the SMTP
4422 if (verify_check_host(&hosts_connection_nolog) == OK)
4423 log_write_selector &= ~L_smtp_connection;
4424 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4425 if (!smtp_start_session())
4428 exim_exit(EXIT_SUCCESS);
4432 /* Otherwise, set up the input size limit here. */
4436 thismessage_size_limit = expand_string_integer(message_size_limit);
4437 if (thismessage_size_limit < 0)
4439 if (thismessage_size_limit == -1)
4440 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4441 "message_size_limit: %s", expand_string_message);
4443 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4444 "message_size_limit: %s", expand_string_message);
4448 /* Loop for several messages when reading SMTP input. If we fork any child
4449 processes, we don't want to wait for them unless synchronous delivery is
4450 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4451 same as SIG_DFL, despite the fact that documentation often lists the default as
4452 "ignore". This is a confusing area. This is what I know:
4454 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4455 processes that complete simply to go away without ever becoming defunct. You
4456 can't then wait for them - but we don't want to wait for them in the
4457 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4458 happen for all OS (e.g. *BSD is different).
4460 But that's not the end of the story. Some (many? all?) systems have the
4461 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4462 has by default, so it seems that the difference is merely one of default
4463 (compare restarting vs non-restarting signals).
4465 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4466 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4467 of the loop below. Paranoia rules.
4469 February 2003: That's *still* not the end of the story. There are now versions
4470 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4471 process then calls waitpid(), a grumble is written to the system log, because
4472 this is logically inconsistent. In other words, it doesn't like the paranoia.
4473 As a consequenc of this, the waitpid() below is now excluded if we are sure
4474 that SIG_IGN works. */
4476 if (!synchronous_delivery)
4479 struct sigaction act;
4480 act.sa_handler = SIG_IGN;
4481 sigemptyset(&(act.sa_mask));
4482 act.sa_flags = SA_NOCLDWAIT;
4483 sigaction(SIGCHLD, &act, NULL);
4485 signal(SIGCHLD, SIG_IGN);
4489 /* Save the current store pool point, for resetting at the start of
4490 each message, and save the real sender address, if any. */
4492 reset_point = store_get(0);
4493 real_sender_address = sender_address;
4495 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4496 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4501 store_reset(reset_point);
4504 /* In the SMTP case, we have to handle the initial SMTP input and build the
4505 recipients list, before calling receive_msg() to read the message proper.
4506 Whatever sender address is actually given in the SMTP transaction is
4507 actually ignored for local senders - we use the actual sender, which is
4508 normally either the underlying user running this process or a -f argument
4509 provided by a trusted caller. It is saved in real_sender_address.
4511 However, if this value is NULL, we are dealing with a trusted caller when
4512 -f was not used; in this case, the SMTP sender is allowed to stand.
4514 Also, if untrusted_set_sender is set, we permit sender addresses that match
4515 anything in its list.
4517 The variable raw_sender_address holds the sender address before rewriting. */
4522 if ((rc = smtp_setup_msg()) > 0)
4524 if (real_sender_address != NULL &&
4525 !receive_check_set_sender(sender_address))
4527 sender_address = raw_sender = real_sender_address;
4528 sender_address_unrewritten = NULL;
4530 more = receive_msg(extract_recipients);
4531 if (message_id[0] == 0)
4534 exim_exit(EXIT_FAILURE);
4537 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4540 /* In the non-SMTP case, we have all the information from the command
4541 line, but must process it in case it is in the more general RFC822
4542 format, and in any case, to detect syntax errors. Also, it appears that
4543 the use of comma-separated lists as single arguments is common, so we
4544 had better support them. */
4550 int count = argc - recipients_arg;
4551 uschar **list = argv + recipients_arg;
4553 /* These options cannot be changed dynamically for non-SMTP messages */
4555 active_local_sender_retain = local_sender_retain;
4556 active_local_from_check = local_from_check;
4558 /* Save before any rewriting */
4560 raw_sender = string_copy(sender_address);
4562 /* Loop for each argument */
4564 for (i = 0; i < count; i++)
4566 int start, end, domain;
4568 uschar *s = list[i];
4570 /* Loop for each comma-separated address */
4574 BOOL finished = FALSE;
4576 uschar *ss = parse_find_address_end(s, FALSE);
4578 if (*ss == ',') *ss = 0; else finished = TRUE;
4580 /* Check max recipients - if -t was used, these aren't recipients */
4582 if (recipients_max > 0 && ++rcount > recipients_max &&
4583 !extract_recipients)
4585 if (error_handling == ERRORS_STDERR)
4587 fprintf(stderr, "exim: too many recipients\n");
4588 exim_exit(EXIT_FAILURE);
4593 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4594 errors_sender_rc : EXIT_FAILURE;
4599 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4601 if (domain == 0 && !allow_unqualified_recipient)
4604 errmess = US"unqualified recipient address not allowed";
4607 if (recipient == NULL)
4609 if (error_handling == ERRORS_STDERR)
4611 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4612 string_printing(list[i]), errmess);
4613 exim_exit(EXIT_FAILURE);
4619 eblock.text1 = string_printing(list[i]);
4620 eblock.text2 = errmess;
4622 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4623 errors_sender_rc : EXIT_FAILURE;
4627 receive_add_recipient(recipient, -1);
4630 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4634 /* Show the recipients when debugging */
4639 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4640 if (recipients_list != NULL)
4642 debug_printf("Recipients:\n");
4643 for (i = 0; i < recipients_count; i++)
4644 debug_printf(" %s\n", recipients_list[i].address);
4648 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4649 ignored; rejecting here would just add complication, and it can just as
4650 well be done later. Allow $recipients to be visible in the ACL. */
4652 if (acl_not_smtp_start != NULL)
4654 uschar *user_msg, *log_msg;
4655 enable_dollar_recipients = TRUE;
4656 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4657 &user_msg, &log_msg);
4658 enable_dollar_recipients = FALSE;
4661 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4662 will just read the headers for the message, and not write anything onto the
4665 message_ended = END_NOTENDED;
4666 more = receive_msg(extract_recipients);
4668 /* more is always FALSE here (not SMTP message) when reading a message
4669 for real; when reading the headers of a message for filter testing,
4670 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4672 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4673 } /* Non-SMTP message reception */
4675 /* If this is a filter testing run, there are headers in store, but
4676 no message on the spool. Run the filtering code in testing mode, setting
4677 the domain to the qualify domain and the local part to the current user,
4678 unless they have been set by options. The prefix and suffix are left unset
4679 unless specified. The the return path is set to to the sender unless it has
4680 already been set from a return-path header in the message. */
4682 if (filter_test != FTEST_NONE)
4684 deliver_domain = (ftest_domain != NULL)?
4685 ftest_domain : qualify_domain_recipient;
4686 deliver_domain_orig = deliver_domain;
4687 deliver_localpart = (ftest_localpart != NULL)?
4688 ftest_localpart : originator_login;
4689 deliver_localpart_orig = deliver_localpart;
4690 deliver_localpart_prefix = ftest_prefix;
4691 deliver_localpart_suffix = ftest_suffix;
4692 deliver_home = originator_home;
4694 if (return_path == NULL)
4696 printf("Return-path copied from sender\n");
4697 return_path = string_copy(sender_address);
4701 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4703 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4705 receive_add_recipient(
4706 string_sprintf("%s%s%s@%s",
4707 (ftest_prefix == NULL)? US"" : ftest_prefix,
4709 (ftest_suffix == NULL)? US"" : ftest_suffix,
4710 deliver_domain), -1);
4712 printf("Recipient = %s\n", recipients_list[0].address);
4713 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4714 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4716 (void)chdir("/"); /* Get away from wherever the user is running this from */
4718 /* Now we run either a system filter test, or a user filter test, or both.
4719 In the latter case, headers added by the system filter will persist and be
4720 available to the user filter. We need to copy the filter variables
4723 if ((filter_test & FTEST_SYSTEM) != 0)
4725 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4726 exim_exit(EXIT_FAILURE);
4729 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4731 if ((filter_test & FTEST_USER) != 0)
4733 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4734 exim_exit(EXIT_FAILURE);
4737 exim_exit(EXIT_SUCCESS);
4740 /* Else act on the result of message reception. We should not get here unless
4741 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4742 TRUE. If it is not, check on the number of messages received in this
4743 connection. If that's OK and queue_only_load is set, check that the load
4744 average is below it. If it is not, set local_queue_only TRUE. Note that it
4745 then remains this way for any subsequent messages on the same SMTP connection.
4746 This is a deliberate choice; even though the load average may fall, it
4747 doesn't seem right to deliver later messages on the same call when not
4748 delivering earlier ones. */
4750 if (!local_queue_only)
4752 if (smtp_accept_queue_per_connection > 0 &&
4753 receive_messagecount > smtp_accept_queue_per_connection)
4755 local_queue_only = TRUE;
4756 queue_only_reason = 2;
4758 else if (queue_only_load >= 0)
4760 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4761 if (local_queue_only) queue_only_reason = 3;
4765 /* If running as an MUA wrapper, all queueing options and freezing options
4769 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4771 /* Log the queueing here, when it will get a message id attached, but
4772 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4775 if (local_queue_only) switch(queue_only_reason)
4778 log_write(L_delay_delivery,
4779 LOG_MAIN, "no immediate delivery: more than %d messages "
4780 "received in one connection", smtp_accept_queue_per_connection);
4784 log_write(L_delay_delivery,
4785 LOG_MAIN, "no immediate delivery: load average %.2f",
4786 (double)load_average/1000.0);
4790 /* Else do the delivery unless the ACL or local_scan() called for queue only
4791 or froze the message. Always deliver in a separate process. A fork failure is
4792 not a disaster, as the delivery will eventually happen on a subsequent queue
4793 run. The search cache must be tidied before the fork, as the parent will
4794 do it before exiting. The child will trigger a lookup failure and
4795 thereby defer the delivery if it tries to use (for example) a cached ldap
4796 connection that the parent has called unbind on. */
4798 else if (!queue_only_policy && !deliver_freeze)
4803 if ((pid = fork()) == 0)
4806 close_unwanted(); /* Close unwanted file descriptors and TLS */
4807 exim_nullstd(); /* Ensure std{in,out,err} exist */
4809 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4810 mode, deliver_drop_privilege is forced TRUE). */
4812 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4814 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4816 /* Control does not return here. */
4819 /* No need to re-exec */
4821 rc = deliver_message(message_id, FALSE, FALSE);
4823 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4824 EXIT_SUCCESS : EXIT_FAILURE);
4829 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4830 "process: %s", strerror(errno));
4833 /* In the parent, wait if synchronous delivery is required. This will
4834 always be the case in MUA wrapper mode. */
4836 else if (synchronous_delivery)
4839 while (wait(&status) != pid);
4840 if ((status & 0x00ff) != 0)
4841 log_write(0, LOG_MAIN|LOG_PANIC,
4842 "process %d crashed with signal %d while delivering %s",
4843 (int)pid, status & 0x00ff, message_id);
4844 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4848 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4849 automatically reaps children (see comments above the loop), clear away any
4850 finished subprocesses here, in case there are lots of messages coming in
4851 from the same source. */
4853 #ifndef SIG_IGN_WORKS
4854 while (waitpid(-1, NULL, WNOHANG) > 0);
4858 exim_exit(EXIT_SUCCESS); /* Never returns */
4859 return 0; /* To stop compiler warning */