1 /* $Cambridge: exim/src/src/exim.c,v 1.19 2005/05/03 14:20:01 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
402 for (i = 0; i <= 2; i++)
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) dup2(devnull, i);
412 if (devnull > 2) close(devnull);
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
441 Exception: We do want it for synchronous delivery!
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
460 tls_close(FALSE); /* Shut down the TLS library */
462 close(fileno(smtp_in));
463 close(fileno(smtp_out));
468 close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address.
592 address the address, with possible port on the end
594 Returns: the port, or zero if there isn't one
595 bombs out on a syntax error
599 check_port(uschar *address)
601 int port = host_extract_port(address);
602 if (string_is_ip_address(address, NULL) == 0)
604 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
612 /*************************************************
613 * Test/verify an address *
614 *************************************************/
616 /* This function is called by the -bv and -bt code. It extracts a working
617 address from a full RFC 822 address. This isn't really necessary per se, but it
618 has the effect of collapsing source routes.
622 flags flag bits for verify_address()
623 exit_value to be set for failures
629 test_address(uschar *s, int flags, int *exit_value)
631 int start, end, domain;
632 uschar *parse_error = NULL;
633 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
637 fprintf(stdout, "syntax error: %s\n", parse_error);
642 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
643 -1, -1, NULL, NULL, NULL);
644 if (rc == FAIL) *exit_value = 2;
645 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
651 /*************************************************
652 * Decode bit settings for log/debug *
653 *************************************************/
655 /* This function decodes a string containing bit settings in the form of +name
656 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
657 also recognizes a numeric setting of the form =<number>, but this is not
658 intended for user use. It's an easy way for Exim to pass the debug settings
659 when it is re-exec'ed.
661 The log options are held in two unsigned ints (because there became too many
662 for one). The top bit in the table means "put in 2nd selector". This does not
663 yet apply to debug options, so the "=" facility sets only the first selector.
665 A bad value for a debug setting is treated as an unknown option - error message
666 to stderr and die. For log settings, which come from the configuration file,
667 we write to the log on the way out...
670 selector1 address of the first bit string
671 selector2 address of the second bit string, or NULL
672 string the configured string
673 options the table of option names
675 which "log" or "debug"
677 Returns: nothing on success - bomb out on failure
681 decode_bits(unsigned int *selector1, unsigned int *selector2, uschar *string,
682 bit_table *options, int count, uschar *which)
685 if (string == NULL) return;
689 char *end; /* Not uschar */
690 *selector1 = strtoul(CS string+1, &end, 0);
691 if (*end == 0) return;
692 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
697 /* Handle symbolic setting */
704 bit_table *start, *end;
706 while (isspace(*string)) string++;
707 if (*string == 0) return;
709 if (*string != '+' && *string != '-')
711 errmsg = string_sprintf("malformed %s_selector setting: "
712 "+ or - expected but found \"%s\"", which, string);
716 adding = *string++ == '+';
718 while (isalnum(*string) || *string == '_') string++;
722 end = options + count;
726 bit_table *middle = start + (end - start)/2;
727 int c = Ustrncmp(s, middle->name, len);
730 if (middle->name[len] != 0) c = -1; else
732 unsigned int bit = middle->bit;
733 unsigned int *selector;
735 /* The value with all bits set means "set all bits in both selectors"
736 in the case where two are being handled. However, the top bit in the
737 second selector is never set. */
739 if (bit == 0xffffffff)
741 *selector1 = adding? bit : 0;
742 if (selector2 != NULL) *selector2 = adding? 0x7fffffff : 0;
745 /* Otherwise, the 0x80000000 bit means "this value, without the top
746 bit, belongs in the second selector". */
750 if ((bit & 0x80000000) != 0)
752 selector = selector2;
755 else selector = selector1;
756 if (adding) *selector |= bit; else *selector &= ~bit;
758 break; /* Out of loop to match selector name */
761 if (c < 0) end = middle; else start = middle + 1;
762 } /* Loop to match selector name */
766 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
767 adding? '+' : '-', len, s);
770 } /* Loop for selector names */
772 /* Handle disasters */
775 if (Ustrcmp(which, "debug") == 0)
777 fprintf(stderr, "exim: %s\n", errmsg);
780 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
785 /*************************************************
786 * Show supported features *
787 *************************************************/
789 /* This function is called for -bV and for -d to output the optional features
790 of the current Exim binary.
792 Arguments: a FILE for printing
797 show_whats_supported(FILE *f)
799 #ifdef DB_VERSION_STRING
800 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
801 #elif defined(BTREEVERSION) && defined(HASHVERSION)
803 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
805 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
807 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
808 fprintf(f, "Probably ndbm\n");
809 #elif defined(USE_TDB)
810 fprintf(f, "Using tdb\n");
813 fprintf(f, "Probably GDBM (native mode)\n");
815 fprintf(f, "Probably GDBM (compatibility mode)\n");
819 fprintf(f, "Support for:");
821 fprintf(f, " iconv()");
833 fprintf(f, " Expand_dlfunc");
835 #ifdef USE_TCP_WRAPPERS
836 fprintf(f, " TCPwrappers");
840 fprintf(f, " GnuTLS");
842 fprintf(f, " OpenSSL");
845 #ifdef WITH_CONTENT_SCAN
846 fprintf(f, " Content_Scanning");
848 #ifdef WITH_OLD_DEMIME
849 fprintf(f, " Old_Demime");
851 #ifdef EXPERIMENTAL_SPF
852 fprintf(f, " Experimental_SPF");
854 #ifdef EXPERIMENTAL_SRS
855 fprintf(f, " Experimental_SRS");
857 #ifdef EXPERIMENTAL_BRIGHTMAIL
858 fprintf(f, " Experimental_Brightmail");
860 #ifdef EXPERIMENTAL_DOMAINKEYS
861 fprintf(f, " Experimental_DomainKeys");
865 fprintf(f, "Lookups:");
866 #ifdef LOOKUP_LSEARCH
867 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
873 fprintf(f, " dbm dbmnz");
876 fprintf(f, " dnsdb");
878 #ifdef LOOKUP_DSEARCH
879 fprintf(f, " dsearch");
882 fprintf(f, " ibase");
885 fprintf(f, " ldap ldapdn ldapm");
888 fprintf(f, " mysql");
891 fprintf(f, " nis nis0");
893 #ifdef LOOKUP_NISPLUS
894 fprintf(f, " nisplus");
897 fprintf(f, " oracle");
900 fprintf(f, " passwd");
903 fprintf(f, " pgsql");
906 fprintf(f, " testdb");
909 fprintf(f, " whoson");
913 fprintf(f, "Authenticators:");
915 fprintf(f, " cram_md5");
917 #ifdef AUTH_CYRUS_SASL
918 fprintf(f, " cyrus_sasl");
920 #ifdef AUTH_PLAINTEXT
921 fprintf(f, " plaintext");
928 fprintf(f, "Routers:");
930 fprintf(f, " accept");
932 #ifdef ROUTER_DNSLOOKUP
933 fprintf(f, " dnslookup");
935 #ifdef ROUTER_IPLITERAL
936 fprintf(f, " ipliteral");
938 #ifdef ROUTER_IPLOOKUP
939 fprintf(f, " iplookup");
941 #ifdef ROUTER_MANUALROUTE
942 fprintf(f, " manualroute");
944 #ifdef ROUTER_QUERYPROGRAM
945 fprintf(f, " queryprogram");
947 #ifdef ROUTER_REDIRECT
948 fprintf(f, " redirect");
952 fprintf(f, "Transports:");
953 #ifdef TRANSPORT_APPENDFILE
954 fprintf(f, " appendfile");
955 #ifdef SUPPORT_MAILDIR
956 fprintf(f, "/maildir");
958 #ifdef SUPPORT_MAILSTORE
959 fprintf(f, "/mailstore");
965 #ifdef TRANSPORT_AUTOREPLY
966 fprintf(f, " autoreply");
968 #ifdef TRANSPORT_LMTP
971 #ifdef TRANSPORT_PIPE
974 #ifdef TRANSPORT_SMTP
979 if (fixed_never_users[0] > 0)
982 fprintf(f, "Fixed never_users: ");
983 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
984 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
985 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
992 /*************************************************
993 * Quote a local part *
994 *************************************************/
996 /* This function is used when a sender address or a From: or Sender: header
997 line is being created from the caller's login, or from an authenticated_id. It
998 applies appropriate quoting rules for a local part.
1000 Argument: the local part
1001 Returns: the local part, quoted if necessary
1005 local_part_quote(uschar *lpart)
1007 BOOL needs_quote = FALSE;
1012 for (t = lpart; !needs_quote && *t != 0; t++)
1014 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1015 (*t != '.' || t == lpart || t[1] == 0);
1018 if (!needs_quote) return lpart;
1021 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1025 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1028 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1031 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1032 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1033 yield = string_cat(yield, &size, &ptr, nq, 1);
1037 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1045 /*************************************************
1046 * Load readline() functions *
1047 *************************************************/
1049 /* This function is called from testing executions that read data from stdin,
1050 but only when running as the calling user. Currently, only -be does this. The
1051 function loads the readline() function library and passes back the functions.
1052 On some systems, it needs the curses library, so load that too, but try without
1053 it if loading fails. All this functionality has to be requested at build time.
1056 fn_readline_ptr pointer to where to put the readline pointer
1057 fn_addhist_ptr pointer to where to put the addhistory function
1059 Returns: the dlopen handle or NULL on failure
1063 set_readline(char * (**fn_readline_ptr)(char *),
1064 char * (**fn_addhist_ptr)(char *))
1067 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1069 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1070 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1072 if (dlhandle != NULL)
1074 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1075 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1079 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1088 /*************************************************
1089 * Get a line from stdin for testing things *
1090 *************************************************/
1092 /* This function is called when running tests that can take a number of lines
1093 of input (for example, -be and -bt). It handles continuations and trailing
1094 spaces. And prompting and a blank line output on eof. If readline() is in use,
1095 the arguments are non-NULL and provide the relevant functions.
1098 fn_readline readline function or NULL
1099 fn_addhist addhist function or NULL
1101 Returns: pointer to dynamic memory, or NULL at end of file
1105 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1110 uschar *yield = NULL;
1112 if (fn_readline == NULL) printf("> ");
1116 uschar buffer[1024];
1120 char *readline_line = NULL;
1121 if (fn_readline != NULL)
1123 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1124 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1125 p = US readline_line;
1130 /* readline() not in use */
1133 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1137 /* Handle the line */
1139 ss = p + (int)Ustrlen(p);
1140 while (ss > p && isspace(ss[-1])) ss--;
1144 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1147 yield = string_cat(yield, &size, &ptr, p, ss - p);
1150 if (fn_readline != NULL) free(readline_line);
1153 if (ss == p || yield[ptr-1] != '\\')
1161 if (yield == NULL) printf("\n");
1167 /*************************************************
1168 * Entry point and high-level code *
1169 *************************************************/
1171 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1172 the appropriate action. All the necessary functions are present in the one
1173 binary. I originally thought one should split it up, but it turns out that so
1174 much of the apparatus is needed in each chunk that one might as well just have
1175 it all available all the time, which then makes the coding easier as well.
1178 argc count of entries in argv
1179 argv argument strings, with argv[0] being the program name
1181 Returns: EXIT_SUCCESS if terminated successfully
1182 EXIT_FAILURE otherwise, except when a message has been sent
1183 to the sender, and -oee was given
1187 main(int argc, char **cargv)
1189 uschar **argv = USS cargv;
1190 int arg_receive_timeout = -1;
1191 int arg_smtp_receive_timeout = -1;
1192 int arg_error_handling = error_handling;
1193 int filter_sfd = -1;
1194 int filter_ufd = -1;
1197 int list_queue_option = 0;
1199 int msg_action_arg = -1;
1200 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1201 int queue_only_reason = 0;
1203 int perl_start_option = 0;
1205 int recipients_arg = argc;
1206 int sender_address_domain = 0;
1207 int test_retry_arg = -1;
1208 int test_rewrite_arg = -1;
1209 BOOL arg_queue_only = FALSE;
1210 BOOL bi_option = FALSE;
1211 BOOL checking = FALSE;
1212 BOOL count_queue = FALSE;
1213 BOOL expansion_test = FALSE;
1214 BOOL extract_recipients = FALSE;
1215 BOOL forced_delivery = FALSE;
1216 BOOL f_end_dot = FALSE;
1217 BOOL deliver_give_up = FALSE;
1218 BOOL list_queue = FALSE;
1219 BOOL list_options = FALSE;
1220 BOOL local_queue_only;
1222 BOOL one_msg_action = FALSE;
1223 BOOL queue_only_set = FALSE;
1224 BOOL receiving_message = TRUE;
1226 BOOL removed_privilege = FALSE;
1227 BOOL verify_address_mode = FALSE;
1228 BOOL verify_as_sender = FALSE;
1229 BOOL version_printed = FALSE;
1230 uschar *alias_arg = NULL;
1231 uschar *called_as = US"";
1232 uschar *start_queue_run_id = NULL;
1233 uschar *stop_queue_run_id = NULL;
1234 uschar *ftest_domain = NULL;
1235 uschar *ftest_localpart = NULL;
1236 uschar *ftest_prefix = NULL;
1237 uschar *ftest_suffix = NULL;
1238 uschar *real_sender_address;
1239 uschar *originator_home = US"/";
1243 struct stat statbuf;
1244 pid_t passed_qr_pid = (pid_t)0;
1245 int passed_qr_pipe = -1;
1246 gid_t group_list[NGROUPS_MAX];
1248 /* Possible options for -R and -S */
1250 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1252 /* Need to define this in case we need to change the environment in order
1253 to get rid of a bogus time zone. We have to make it char rather than uschar
1254 because some OS define it in /usr/include/unistd.h. */
1256 extern char **environ;
1258 /* If the Exim user and/or group and/or the configuration file owner/group were
1259 defined by ref:name at build time, we must now find the actual uid/gid values.
1260 This is a feature to make the lives of binary distributors easier. */
1262 #ifdef EXIM_USERNAME
1263 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1265 exim_gid = pw->pw_gid;
1269 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1275 #ifdef EXIM_GROUPNAME
1276 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1278 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1284 #ifdef CONFIGURE_OWNERNAME
1285 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1287 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1288 CONFIGURE_OWNERNAME);
1293 #ifdef CONFIGURE_GROUPNAME
1294 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1296 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1297 CONFIGURE_GROUPNAME);
1302 /* In the Cygwin environment, some initialization needs doing. It is fudged
1303 in by means of this macro. */
1309 /* Check a field which is patched when we are running Exim within its
1310 testing harness; do a fast initial check, and then the whole thing. */
1312 running_in_test_harness =
1313 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1315 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1316 at the start of a program; however, it seems that some environments do not
1317 follow this. A "strange" locale can affect the formatting of timestamps, so we
1320 setlocale(LC_ALL, "C");
1322 /* Set up the default handler for timing using alarm(). */
1324 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1326 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1327 because store_malloc writes a log entry on failure. */
1329 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1330 if (log_buffer == NULL)
1332 fprintf(stderr, "exim: failed to get store for log buffer\n");
1336 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1337 NULL when the daemon is run and the file is closed. We have to use this
1338 indirection, because some systems don't allow writing to the variable "stderr".
1341 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1343 /* Arrange for the PCRE regex library to use our store functions. Note that
1344 the normal calls are actually macros that add additional arguments for
1345 debugging purposes so we have to assign specially constructed functions here.
1346 The default is to use store in the stacking pool, but this is overridden in the
1347 regex_must_compile() function. */
1349 pcre_malloc = function_store_get;
1350 pcre_free = function_dummy_free;
1352 /* Ensure there is a big buffer for temporary use in several places. It is put
1353 in malloc store so that it can be freed for enlargement if necessary. */
1355 big_buffer = store_malloc(big_buffer_size);
1357 /* Set up the handler for the data request signal, and set the initial
1358 descriptive text. */
1360 set_process_info("initializing");
1361 os_restarting_signal(SIGUSR1, usr1_handler);
1363 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1364 in the daemon code. For the rest of Exim's uses, we ignore it. */
1366 signal(SIGHUP, SIG_IGN);
1368 /* We don't want to die on pipe errors as the code is written to handle
1369 the write error instead. */
1371 signal(SIGPIPE, SIG_IGN);
1373 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1374 set to SIG_IGN. This causes subprocesses that complete before the parent
1375 process waits for them not to hang around, so when Exim calls wait(), nothing
1376 is there. The wait() code has been made robust against this, but let's ensure
1377 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1378 ending status. We use sigaction rather than plain signal() on those OS where
1379 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1380 problem on AIX with this.) */
1384 struct sigaction act;
1385 act.sa_handler = SIG_DFL;
1386 sigemptyset(&(act.sa_mask));
1388 sigaction(SIGCHLD, &act, NULL);
1391 signal(SIGCHLD, SIG_DFL);
1394 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1399 /* Set up the version number. Set up the leading 'E' for the external form of
1400 message ids, set the pointer to the internal form, and initialize it to
1401 indicate no message being processed. */
1404 message_id_option[0] = '-';
1405 message_id_external = message_id_option + 1;
1406 message_id_external[0] = 'E';
1407 message_id = message_id_external + 1;
1410 /* Set the umask to zero so that any files that Exim creates are created
1411 with the modes that it specifies. */
1415 /* Precompile the regular expression for matching a message id. Keep this in
1416 step with the code that generates ids in the accept.c module. We need to do
1417 this here, because the -M options check their arguments for syntactic validity
1418 using mac_ismsgid, which uses this. */
1421 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1423 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1424 this seems to be a generally accepted convention, since one finds symbolic
1425 links called "mailq" in standard OS configurations. */
1427 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1428 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1431 receiving_message = FALSE;
1432 called_as = US"-mailq";
1435 /* If the program is called as "rmail" treat it as equivalent to
1436 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1437 i.e. preventing a single dot on a line from terminating the message, and
1438 returning with zero return code, even in cases of error (provided an error
1439 message has been sent). */
1441 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1442 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1445 called_as = US"-rmail";
1446 errors_sender_rc = EXIT_SUCCESS;
1449 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1450 this is a smail convention. */
1452 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1453 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1455 smtp_input = smtp_batched_input = TRUE;
1456 called_as = US"-rsmtp";
1459 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1460 this is a smail convention. */
1462 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1463 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1466 receiving_message = FALSE;
1467 called_as = US"-runq";
1470 /* If the program is called as "newaliases" treat it as equivalent to
1471 "exim -bi"; this is a sendmail convention. */
1473 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1474 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1477 receiving_message = FALSE;
1478 called_as = US"-newaliases";
1481 /* Save the original effective uid for a couple of uses later. It should
1482 normally be root, but in some esoteric environments it may not be. */
1484 original_euid = geteuid();
1486 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1487 to be the same as the real ones. This makes a difference only if Exim is setuid
1488 (or setgid) to something other than root, which could be the case in some
1489 special configurations. */
1491 real_uid = getuid();
1492 real_gid = getgid();
1494 if (real_uid == root_uid)
1500 /* If neither the original real uid nor the original euid was root, Exim is
1501 running in an unprivileged state. */
1503 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1505 /* If the first argument is --help, pretend there are no arguments. This will
1506 cause a brief message to be given. */
1508 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1510 /* Scan the program's arguments. Some can be dealt with right away; others are
1511 simply recorded for checking and handling afterwards. Do a high-level switch
1512 on the second character (the one after '-'), to save some effort. */
1514 for (i = 1; i < argc; i++)
1516 BOOL badarg = FALSE;
1517 uschar *arg = argv[i];
1521 /* An argument not starting with '-' is the start of a recipients list;
1522 break out of the options-scanning loop. */
1530 /* An option consistion of -- terminates the options */
1532 if (Ustrcmp(arg, "--") == 0)
1534 recipients_arg = i + 1;
1538 /* Handle flagged options */
1540 switchchar = arg[1];
1543 /* Make all -ex options synonymous with -oex arguments, since that
1544 is assumed by various callers. Also make -qR options synonymous with -R
1545 options, as that seems to be required as well. Allow for -qqR too, and
1546 the same for -S options. */
1548 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1549 Ustrncmp(arg+1, "qR", 2) == 0 ||
1550 Ustrncmp(arg+1, "qS", 2) == 0)
1552 switchchar = arg[2];
1555 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1557 switchchar = arg[3];
1559 queue_2stage = TRUE;
1562 /* Make -r synonymous with -f, since it is a documented alias */
1564 else if (arg[1] == 'r') switchchar = 'f';
1566 /* Make -ov synonymous with -v */
1568 else if (Ustrcmp(arg, "-ov") == 0)
1574 /* High-level switch on active initial letter */
1578 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1579 so has no need of it. */
1582 if (*argrest == 0) i++; /* Skip over the type */
1587 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1589 /* -bd: Run in daemon mode, awaiting SMTP connections.
1590 -bdf: Ditto, but in the foreground.
1593 if (*argrest == 'd')
1595 daemon_listen = TRUE;
1596 if (*(++argrest) == 'f') background_daemon = FALSE;
1597 else if (*argrest != 0) { badarg = TRUE; break; }
1600 /* -be: Run in expansion test mode */
1602 else if (*argrest == 'e')
1603 expansion_test = checking = TRUE;
1605 /* -bF: Run system filter test */
1607 else if (*argrest == 'F')
1609 filter_test |= FTEST_SYSTEM;
1610 if (*(++argrest) != 0) { badarg = TRUE; break; }
1611 if (++i < argc) filter_test_sfile = argv[i]; else
1613 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1618 /* -bf: Run user filter test
1619 -bfd: Set domain for filter testing
1620 -bfl: Set local part for filter testing
1621 -bfp: Set prefix for filter testing
1622 -bfs: Set suffix for filter testing
1625 else if (*argrest == 'f')
1627 if (*(++argrest) == 0)
1629 filter_test |= FTEST_USER;
1630 if (++i < argc) filter_test_ufile = argv[i]; else
1632 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1640 fprintf(stderr, "exim: string expected after %s\n", arg);
1643 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1644 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1645 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1646 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1647 else { badarg = TRUE; break; }
1651 /* -bh: Host checking - an IP address must follow. */
1653 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1655 if (++i >= argc) { badarg = TRUE; break; }
1656 sender_host_address = argv[i];
1657 host_checking = checking = log_testing_mode = TRUE;
1658 host_checking_callout = argrest[1] == 'c';
1661 /* -bi: This option is used by sendmail to initialize *the* alias file,
1662 though it has the -oA option to specify a different file. Exim has no
1663 concept of *the* alias file, but since Sun's YP make script calls
1664 sendmail this way, some support must be provided. */
1666 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1668 /* -bm: Accept and deliver message - the default option. Reinstate
1669 receiving_message, which got turned off for all -b options. */
1671 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1673 /* -bnq: For locally originating messages, do not qualify unqualified
1674 addresses. In the envelope, this causes errors; in header lines they
1677 else if (Ustrcmp(argrest, "nq") == 0)
1679 allow_unqualified_sender = FALSE;
1680 allow_unqualified_recipient = FALSE;
1683 /* -bpxx: List the contents of the mail queue, in various forms. If
1684 the option is -bpc, just a queue count is needed. Otherwise, if the
1685 first letter after p is r, then order is random. */
1687 else if (*argrest == 'p')
1689 if (*(++argrest) == 'c')
1692 if (*(++argrest) != 0) badarg = TRUE;
1696 if (*argrest == 'r')
1698 list_queue_option = 8;
1701 else list_queue_option = 0;
1705 /* -bp: List the contents of the mail queue, top-level only */
1707 if (*argrest == 0) {}
1709 /* -bpu: List the contents of the mail queue, top-level undelivered */
1711 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1713 /* -bpa: List the contents of the mail queue, including all delivered */
1715 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1717 /* Unknown after -bp[r] */
1727 /* -bP: List the configuration variables given as the address list.
1728 Force -v, so configuration errors get displayed. */
1730 else if (Ustrcmp(argrest, "P") == 0)
1732 list_options = TRUE;
1733 debug_selector |= D_v;
1734 debug_file = stderr;
1737 /* -brt: Test retry configuration lookup */
1739 else if (Ustrcmp(argrest, "rt") == 0)
1741 test_retry_arg = i + 1;
1745 /* -brw: Test rewrite configuration */
1747 else if (Ustrcmp(argrest, "rw") == 0)
1749 test_rewrite_arg = i + 1;
1753 /* -bS: Read SMTP commands on standard input, but produce no replies -
1754 all errors are reported by sending messages. */
1756 else if (Ustrcmp(argrest, "S") == 0)
1757 smtp_input = smtp_batched_input = receiving_message = TRUE;
1759 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1760 on standard output. */
1762 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1764 /* -bt: address testing mode */
1766 else if (Ustrcmp(argrest, "t") == 0)
1767 address_test_mode = checking = log_testing_mode = TRUE;
1769 /* -bv: verify addresses */
1771 else if (Ustrcmp(argrest, "v") == 0)
1772 verify_address_mode = checking = log_testing_mode = TRUE;
1774 /* -bvs: verify sender addresses */
1776 else if (Ustrcmp(argrest, "vs") == 0)
1778 verify_address_mode = checking = log_testing_mode = TRUE;
1779 verify_as_sender = TRUE;
1782 /* -bV: Print version string and support details */
1784 else if (Ustrcmp(argrest, "V") == 0)
1786 printf("Exim version %s #%s built %s\n", version_string,
1787 version_cnumber, version_date);
1788 printf("%s\n", CS version_copyright);
1789 version_printed = TRUE;
1790 show_whats_supported(stdout);
1797 /* -C: change configuration file list; ignore if it isn't really
1798 a change! Enforce a prefix check if required. */
1803 if(++i < argc) argrest = argv[i]; else
1804 { badarg = TRUE; break; }
1806 if (Ustrcmp(config_main_filelist, argrest) != 0)
1808 #ifdef ALT_CONFIG_PREFIX
1810 int len = Ustrlen(ALT_CONFIG_PREFIX);
1811 uschar *list = argrest;
1813 while((filename = string_nextinlist(&list, &sep, big_buffer,
1814 big_buffer_size)) != NULL)
1816 if ((Ustrlen(filename) < len ||
1817 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1818 Ustrstr(filename, "/../") != NULL) &&
1819 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1821 fprintf(stderr, "-C Permission denied\n");
1827 config_main_filelist = argrest;
1828 config_changed = TRUE;
1833 /* -D: set up a macro definition */
1836 #ifdef DISABLE_D_OPTION
1837 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1842 macro_item *mlast = NULL;
1845 uschar *s = argrest;
1847 while (isspace(*s)) s++;
1849 if (*s < 'A' || *s > 'Z')
1851 fprintf(stderr, "exim: macro name set by -D must start with "
1852 "an upper case letter\n");
1856 while (isalnum(*s) || *s == '_')
1858 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1862 if (ptr == 0) { badarg = TRUE; break; }
1863 while (isspace(*s)) s++;
1866 if (*s++ != '=') { badarg = TRUE; break; }
1867 while (isspace(*s)) s++;
1870 for (m = macros; m != NULL; m = m->next)
1872 if (Ustrcmp(m->name, name) == 0)
1874 fprintf(stderr, "exim: duplicated -D in command line\n");
1880 m = store_get(sizeof(macro_item) + Ustrlen(name));
1882 m->command_line = TRUE;
1883 if (mlast == NULL) macros = m; else mlast->next = m;
1884 Ustrcpy(m->name, name);
1885 m->replacement = string_copy(s);
1887 if (clmacro_count >= MAX_CLMACROS)
1889 fprintf(stderr, "exim: too many -D options on command line\n");
1892 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1898 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1899 The latter is now a no-op, retained for compatibility only. If -dd is used,
1900 debugging subprocesses of the daemon is disabled. */
1903 if (Ustrcmp(argrest, "ropcr") == 0)
1905 /* drop_cr = TRUE; */
1908 /* Use an intermediate variable so that we don't set debugging while
1909 decoding the debugging bits. */
1913 unsigned int selector = D_default;
1916 if (*argrest == 'd')
1918 debug_daemon = TRUE;
1922 decode_bits(&selector, NULL, argrest, debug_options,
1923 debug_options_count, US"debug");
1924 debug_selector = selector;
1929 /* -E: This is a local error message. This option is not intended for
1930 external use at all, but is not restricted to trusted callers because it
1931 does no harm (just suppresses certain error messages) and if Exim is run
1932 not setuid root it won't always be trusted when it generates error
1933 messages using this option. If there is a message id following -E, point
1934 message_reference at it, for logging. */
1937 local_error_message = TRUE;
1938 if (mac_ismsgid(argrest)) message_reference = argrest;
1942 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1943 option, so it looks as if historically the -oex options are also callable
1944 without the leading -o. So we have to accept them. Before the switch,
1945 anything starting -oe has been converted to -e. Exim does not support all
1946 of the sendmail error options. */
1949 if (Ustrcmp(argrest, "e") == 0)
1951 arg_error_handling = ERRORS_SENDER;
1952 errors_sender_rc = EXIT_SUCCESS;
1954 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1955 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1956 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1957 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1962 /* -F: Set sender's full name, used instead of the gecos entry from
1963 the password file. Since users can usually alter their gecos entries,
1964 there's no security involved in using this instead. The data can follow
1965 the -F or be in the next argument. */
1970 if(++i < argc) argrest = argv[i]; else
1971 { badarg = TRUE; break; }
1973 originator_name = argrest;
1977 /* -f: Set sender's address - this value is only actually used if Exim is
1978 run by a trusted user, or if untrusted_set_sender is set and matches the
1979 address, except that the null address can always be set by any user. The
1980 test for this happens later, when the value given here is ignored when not
1981 permitted. For an untrusted user, the actual sender is still put in Sender:
1982 if it doesn't match the From: header (unless no_local_from_check is set).
1983 The data can follow the -f or be in the next argument. The -r switch is an
1984 obsolete form of -f but since there appear to be programs out there that
1985 use anything that sendmail has ever supported, better accept it - the
1986 synonymizing is done before the switch above.
1988 At this stage, we must allow domain literal addresses, because we don't
1989 know what the setting of allow_domain_literals is yet. Ditto for trailing
1990 dots and strip_trailing_dot. */
1998 if (i+1 < argc) argrest = argv[++i]; else
1999 { badarg = TRUE; break; }
2003 sender_address = string_sprintf(""); /* Ensure writeable memory */
2007 uschar *temp = argrest + Ustrlen(argrest) - 1;
2008 while (temp >= argrest && isspace(*temp)) temp--;
2009 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2010 allow_domain_literals = TRUE;
2011 strip_trailing_dot = TRUE;
2012 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2013 &sender_address_domain, TRUE);
2014 allow_domain_literals = FALSE;
2015 strip_trailing_dot = FALSE;
2016 if (sender_address == NULL)
2018 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2019 return EXIT_FAILURE;
2022 sender_address_forced = TRUE;
2026 /* This is some Sendmail thing which can be ignored */
2031 /* -h: Set the hop count for an incoming message. Exim does not currently
2032 support this; it always computes it by counting the Received: headers.
2033 To put it in will require a change to the spool header file format. */
2038 if(++i < argc) argrest = argv[i]; else
2039 { badarg = TRUE; break; }
2041 if (!isdigit(*argrest)) badarg = TRUE;
2045 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2046 not to be documented for sendmail but mailx (at least) uses it) */
2049 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2054 receiving_message = FALSE;
2056 /* -MC: continue delivery of another message via an existing open
2057 file descriptor. This option is used for an internal call by the
2058 smtp transport when there is a pending message waiting to go to an
2059 address to which it has got a connection. Five subsequent arguments are
2060 required: transport name, host name, IP address, sequence number, and
2061 message_id. Transports may decline to create new processes if the sequence
2062 number gets too big. The channel is stdin. This (-MC) must be the last
2063 argument. There's a subsequent check that the real-uid is privileged.
2065 If we are running in the test harness. delay for a bit, to let the process
2066 that set this one up complete. This makes for repeatability of the logging,
2069 if (Ustrcmp(argrest, "C") == 0)
2073 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2074 return EXIT_FAILURE;
2077 if (msg_action_arg >= 0)
2079 fprintf(stderr, "exim: incompatible arguments\n");
2080 return EXIT_FAILURE;
2083 continue_transport = argv[++i];
2084 continue_hostname = argv[++i];
2085 continue_host_address = argv[++i];
2086 continue_sequence = Uatoi(argv[++i]);
2087 msg_action = MSG_DELIVER;
2088 msg_action_arg = ++i;
2089 forced_delivery = TRUE;
2090 queue_run_pid = passed_qr_pid;
2091 queue_run_pipe = passed_qr_pipe;
2093 if (!mac_ismsgid(argv[i]))
2095 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2097 return EXIT_FAILURE;
2100 if (running_in_test_harness) millisleep(500);
2104 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2105 precedes -MC (see above). The flag indicates that the host to which
2106 Exim is connected has accepted an AUTH sequence. */
2108 else if (Ustrcmp(argrest, "CA") == 0)
2110 smtp_authenticated = TRUE;
2114 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2115 it preceded -MC (see above) */
2117 else if (Ustrcmp(argrest, "CP") == 0)
2119 smtp_use_pipelining = TRUE;
2123 /* -MCQ: pass on the pid of the queue-running process that started
2124 this chain of deliveries and the fd of its synchronizing pipe; this
2125 is useful only when it precedes -MC (see above) */
2127 else if (Ustrcmp(argrest, "CQ") == 0)
2129 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2131 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2136 /* -MCS: set the smtp_use_size flag; this is useful only when it
2137 precedes -MC (see above) */
2139 else if (Ustrcmp(argrest, "CS") == 0)
2141 smtp_use_size = TRUE;
2145 /* -MCT: set the tls_offered flag; this is useful only when it
2146 precedes -MC (see above). The flag indicates that the host to which
2147 Exim is connected has offered TLS support. */
2150 else if (Ustrcmp(argrest, "CT") == 0)
2157 /* -M[x]: various operations on the following list of message ids:
2158 -M deliver the messages, ignoring next retry times and thawing
2159 -Mc deliver the messages, checking next retry times, no thawing
2160 -Mf freeze the messages
2161 -Mg give up on the messages
2162 -Mt thaw the messages
2163 -Mrm remove the messages
2164 In the above cases, this must be the last option. There are also the
2165 following options which are followed by a single message id, and which
2166 act on that message. Some of them use the "recipient" addresses as well.
2167 -Mar add recipient(s)
2168 -Mmad mark all recipients delivered
2169 -Mmd mark recipients(s) delivered
2176 else if (*argrest == 0)
2178 msg_action = MSG_DELIVER;
2179 forced_delivery = deliver_force_thaw = TRUE;
2181 else if (Ustrcmp(argrest, "ar") == 0)
2183 msg_action = MSG_ADD_RECIPIENT;
2184 one_msg_action = TRUE;
2186 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2187 else if (Ustrcmp(argrest, "es") == 0)
2189 msg_action = MSG_EDIT_SENDER;
2190 one_msg_action = TRUE;
2192 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2193 else if (Ustrcmp(argrest, "g") == 0)
2195 msg_action = MSG_DELIVER;
2196 deliver_give_up = TRUE;
2198 else if (Ustrcmp(argrest, "mad") == 0)
2200 msg_action = MSG_MARK_ALL_DELIVERED;
2202 else if (Ustrcmp(argrest, "md") == 0)
2204 msg_action = MSG_MARK_DELIVERED;
2205 one_msg_action = TRUE;
2207 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2208 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2209 else if (Ustrcmp(argrest, "vb") == 0)
2211 msg_action = MSG_SHOW_BODY;
2212 one_msg_action = TRUE;
2214 else if (Ustrcmp(argrest, "vh") == 0)
2216 msg_action = MSG_SHOW_HEADER;
2217 one_msg_action = TRUE;
2219 else if (Ustrcmp(argrest, "vl") == 0)
2221 msg_action = MSG_SHOW_LOG;
2222 one_msg_action = TRUE;
2224 else { badarg = TRUE; break; }
2226 /* All the -Mxx options require at least one message id. */
2228 msg_action_arg = i + 1;
2229 if (msg_action_arg >= argc)
2231 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2232 return EXIT_FAILURE;
2235 /* Some require only message ids to follow */
2237 if (!one_msg_action)
2240 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2242 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2244 return EXIT_FAILURE;
2246 goto END_ARG; /* Remaining args are ids */
2249 /* Others require only one message id, possibly followed by addresses,
2250 which will be handled as normal arguments. */
2254 if (!mac_ismsgid(argv[msg_action_arg]))
2256 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2257 argv[msg_action_arg], arg);
2258 return EXIT_FAILURE;
2265 /* Some programs seem to call the -om option without the leading o;
2266 for sendmail it askes for "me too". Exim always does this. */
2269 if (*argrest != 0) badarg = TRUE;
2273 /* -N: don't do delivery - a debugging option that stops transports doing
2274 their thing. It implies debugging at the D_v level. */
2279 dont_deliver = TRUE;
2280 debug_selector |= D_v;
2281 debug_file = stderr;
2287 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2293 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2294 option to the specified value. This form uses long names. We need to handle
2295 -O option=value and -Ooption=value. */
2302 fprintf(stderr, "exim: string expected after -O\n");
2310 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2313 if (*argrest == 'A')
2315 alias_arg = argrest + 1;
2316 if (alias_arg[0] == 0)
2318 if (i+1 < argc) alias_arg = argv[++i]; else
2320 fprintf(stderr, "exim: string expected after -oA\n");
2326 /* -oB: Set a connection message max value for remote deliveries */
2328 else if (*argrest == 'B')
2330 uschar *p = argrest + 1;
2333 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2335 connection_max_messages = 1;
2344 fprintf(stderr, "exim: number expected after -oB\n");
2347 connection_max_messages = Uatoi(p);
2351 /* -odb: background delivery */
2353 else if (Ustrcmp(argrest, "db") == 0)
2355 synchronous_delivery = FALSE;
2356 arg_queue_only = FALSE;
2357 queue_only_set = TRUE;
2360 /* -odf: foreground delivery (smail-compatible option); same effect as
2361 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2364 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2366 synchronous_delivery = TRUE;
2367 arg_queue_only = FALSE;
2368 queue_only_set = TRUE;
2371 /* -odq: queue only */
2373 else if (Ustrcmp(argrest, "dq") == 0)
2375 synchronous_delivery = FALSE;
2376 arg_queue_only = TRUE;
2377 queue_only_set = TRUE;
2380 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2381 but no remote delivery */
2383 else if (Ustrcmp(argrest, "dqs") == 0)
2386 arg_queue_only = FALSE;
2387 queue_only_set = TRUE;
2390 /* -oex: Sendmail error flags. As these are also accepted without the
2391 leading -o prefix, for compatibility with vacation and other callers,
2392 they are handled with -e above. */
2394 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2395 -oitrue: Another sendmail syntax for the same */
2397 else if (Ustrcmp(argrest, "i") == 0 ||
2398 Ustrcmp(argrest, "itrue") == 0)
2401 /* -oM*: Set various characteristics for an incoming message; actually
2402 acted on for trusted callers only. */
2404 else if (*argrest == 'M')
2408 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2412 /* -oMa: Set sender host address */
2414 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2416 /* -oMaa: Set authenticator name */
2418 else if (Ustrcmp(argrest, "Maa") == 0)
2419 sender_host_authenticated = argv[++i];
2421 /* -oMas: setting authenticated sender */
2423 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2425 /* -oMai: setting authenticated id */
2427 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2429 /* -oMi: Set incoming interface address */
2431 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2433 /* -oMr: Received protocol */
2435 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2437 /* -oMs: Set sender host name */
2439 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2441 /* -oMt: Set sender ident */
2443 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2445 /* Else a bad argument */
2454 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2455 seem to call this as -m (undocumented), so that is also accepted (see
2458 else if (Ustrcmp(argrest, "m") == 0) {}
2460 /* -oo: An ancient flag for old-style addresses which still seems to
2461 crop up in some calls (see in SCO). */
2463 else if (Ustrcmp(argrest, "o") == 0) {}
2465 /* -oP <name>: set pid file path for daemon */
2467 else if (Ustrcmp(argrest, "P") == 0)
2468 override_pid_file_path = argv[++i];
2470 /* -or <n>: set timeout for non-SMTP acceptance
2471 -os <n>: set timeout for SMTP acceptance */
2473 else if (*argrest == 'r' || *argrest == 's')
2475 int *tp = (*argrest == 'r')?
2476 &arg_receive_timeout : &arg_smtp_receive_timeout;
2477 if (argrest[1] == 0)
2479 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2481 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2484 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2489 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2491 else if (Ustrcmp(argrest, "X") == 0)
2492 override_local_interfaces = argv[++i];
2494 /* Unknown -o argument */
2500 /* -ps: force Perl startup; -pd force delayed Perl startup */
2504 if (*argrest == 's' && argrest[1] == 0)
2506 perl_start_option = 1;
2509 if (*argrest == 'd' && argrest[1] == 0)
2511 perl_start_option = -1;
2516 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2517 which sets the host protocol and host name */
2521 if (i+1 < argc) argrest = argv[++i]; else
2522 { badarg = TRUE; break; }
2527 uschar *hn = Ustrchr(argrest, ':');
2530 received_protocol = argrest;
2534 received_protocol = string_copyn(argrest, hn - argrest);
2535 sender_host_name = hn + 1;
2542 receiving_message = FALSE;
2544 /* -qq...: Do queue runs in a 2-stage manner */
2546 if (*argrest == 'q')
2548 queue_2stage = TRUE;
2552 /* -qi...: Do only first (initial) deliveries */
2554 if (*argrest == 'i')
2556 queue_run_first_delivery = TRUE;
2560 /* -qf...: Run the queue, forcing deliveries
2561 -qff..: Ditto, forcing thawing as well */
2563 if (*argrest == 'f')
2565 queue_run_force = TRUE;
2566 if (*(++argrest) == 'f')
2568 deliver_force_thaw = TRUE;
2573 /* -q[f][f]l...: Run the queue only on local deliveries */
2575 if (*argrest == 'l')
2577 queue_run_local = TRUE;
2581 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2582 optionally starting from a given message id. */
2584 if (*argrest == 0 &&
2585 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2588 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2589 start_queue_run_id = argv[++i];
2590 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2591 stop_queue_run_id = argv[++i];
2594 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2595 optionally local only. */
2600 queue_interval = readconf_readtime(argrest, 0, FALSE);
2602 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2603 if (queue_interval <= 0)
2605 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2612 case 'R': /* Synonymous with -qR... */
2613 receiving_message = FALSE;
2615 /* -Rf: As -R (below) but force all deliveries,
2616 -Rff: Ditto, but also thaw all frozen messages,
2617 -Rr: String is regex
2618 -Rrf: Regex and force
2619 -Rrff: Regex and force and thaw
2621 in all cases provided there are no further characters in this
2627 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2629 if (Ustrcmp(argrest, rsopts[i]) == 0)
2631 if (i != 2) queue_run_force = TRUE;
2632 if (i >= 2) deliver_selectstring_regex = TRUE;
2633 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2634 argrest += Ustrlen(rsopts[i]);
2639 /* -R: Set string to match in addresses for forced queue run to
2640 pick out particular messages. */
2644 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2646 fprintf(stderr, "exim: string expected after -R\n");
2650 else deliver_selectstring = argrest;
2651 if (queue_interval < 0) queue_interval = 0;
2655 /* -r: an obsolete synonym for -f (see above) */
2658 /* -S: Like -R but works on sender. */
2660 case 'S': /* Synonymous with -qS... */
2661 receiving_message = FALSE;
2663 /* -Sf: As -S (below) but force all deliveries,
2664 -Sff: Ditto, but also thaw all frozen messages,
2665 -Sr: String is regex
2666 -Srf: Regex and force
2667 -Srff: Regex and force and thaw
2669 in all cases provided there are no further characters in this
2675 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2677 if (Ustrcmp(argrest, rsopts[i]) == 0)
2679 if (i != 2) queue_run_force = TRUE;
2680 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2681 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2682 argrest += Ustrlen(rsopts[i]);
2687 /* -S: Set string to match in addresses for forced queue run to
2688 pick out particular messages. */
2692 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2694 fprintf(stderr, "exim: string expected after -S\n");
2698 else deliver_selectstring_sender = argrest;
2699 if (queue_interval < 0) queue_interval = 0;
2702 /* -Tqt is an option that is exclusively for use by the testing suite.
2703 It is not recognized in other circumstances. It allows for the setting up
2704 of explicit "queue times" so that various warning/retry things can be
2705 tested. Otherwise variability of clock ticks etc. cause problems. */
2708 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2709 fudged_queue_times = argv[++i];
2714 /* -t: Set flag to extract recipients from body of message. */
2717 if (*argrest == 0) extract_recipients = TRUE;
2719 /* -ti: Set flag to extract recipients from body of message, and also
2720 specify that dot does not end the message. */
2722 else if (Ustrcmp(argrest, "i") == 0)
2724 extract_recipients = TRUE;
2728 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2731 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2738 /* -U: This means "initial user submission" in sendmail, apparently. The
2739 doc claims that in future sendmail may refuse syntactically invalid
2740 messages instead of fixing them. For the moment, we just ignore it. */
2746 /* -v: verify things - this is a very low-level debugging */
2751 debug_selector |= D_v;
2752 debug_file = stderr;
2758 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2760 The -x flag tells the sendmail command that mail from a local
2761 mail program has National Language Support (NLS) extended characters
2762 in the body of the mail item. The sendmail command can send mail with
2763 extended NLS characters across networks that normally corrupts these
2766 As Exim is 8-bit clean, it just ignores this flag. */
2769 if (*argrest != 0) badarg = TRUE;
2772 /* All other initial characters are errors */
2777 } /* End of high-level switch statement */
2779 /* Failed to recognize the option, or syntax error */
2783 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2784 "option %s\n", arg);
2790 /* Arguments have been processed. Check for incompatibilities. */
2794 (smtp_input || extract_recipients || recipients_arg < argc) &&
2795 (daemon_listen || queue_interval >= 0 || bi_option ||
2796 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2797 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2800 msg_action_arg > 0 &&
2801 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2802 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2805 (daemon_listen || queue_interval >= 0) &&
2806 (sender_address != NULL || list_options || list_queue || checking ||
2810 daemon_listen && queue_interval == 0
2814 (checking || smtp_input || extract_recipients ||
2815 filter_test != FTEST_NONE || bi_option)
2818 verify_address_mode &&
2819 (address_test_mode || smtp_input || extract_recipients ||
2820 filter_test != FTEST_NONE || bi_option)
2823 address_test_mode && (smtp_input || extract_recipients ||
2824 filter_test != FTEST_NONE || bi_option)
2827 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2831 deliver_selectstring != NULL && queue_interval < 0
2835 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2839 /* If debugging is set up, set the file and the file descriptor to pass on to
2840 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2841 to run in the foreground. */
2843 if (debug_selector != 0)
2845 debug_file = stderr;
2846 debug_fd = fileno(debug_file);
2847 background_daemon = FALSE;
2848 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2849 if (debug_selector != D_v) /* -v only doesn't show this */
2851 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2852 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2854 show_whats_supported(stderr);
2858 /* When started with root privilege, ensure that the limits on the number of
2859 open files and the number of processes (where that is accessible) are
2860 sufficiently large, or are unset, in case Exim has been called from an
2861 environment where the limits are screwed down. Not all OS have the ability to
2862 change some of these limits. */
2866 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2872 #ifdef RLIMIT_NOFILE
2873 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2875 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2877 rlp.rlim_cur = rlp.rlim_max = 0;
2880 /* I originally chose 1000 as a nice big number that was unlikely to
2881 be exceeded. It turns out that some older OS have a fixed upper limit of
2884 if (rlp.rlim_cur < 1000)
2886 rlp.rlim_cur = rlp.rlim_max = 1000;
2887 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2889 rlp.rlim_cur = rlp.rlim_max = 256;
2890 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2891 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2898 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2900 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2902 rlp.rlim_cur = rlp.rlim_max = 0;
2905 #ifdef RLIM_INFINITY
2906 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2908 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2910 if (rlp.rlim_cur < 1000)
2912 rlp.rlim_cur = rlp.rlim_max = 1000;
2914 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2915 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2921 /* Exim is normally entered as root (but some special configurations are
2922 possible that don't do this). However, it always spins off sub-processes that
2923 set their uid and gid as required for local delivery. We don't want to pass on
2924 any extra groups that root may belong to, so we want to get rid of them all at
2927 We need to obey setgroups() at this stage, before possibly giving up root
2928 privilege for a changed configuration file, but later on we might need to
2929 check on the additional groups for the admin user privilege - can't do that
2930 till after reading the config, which might specify the exim gid. Therefore,
2931 save the group list here first. */
2933 group_count = getgroups(NGROUPS_MAX, group_list);
2935 /* There is a fundamental difference in some BSD systems in the matter of
2936 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2937 known not to be different. On the "different" systems there is a single group
2938 list, and the first entry in it is the current group. On all other versions of
2939 Unix there is a supplementary group list, which is in *addition* to the current
2940 group. Consequently, to get rid of all extraneous groups on a "standard" system
2941 you pass over 0 groups to setgroups(), while on a "different" system you pass
2942 over a single group - the current group, which is always the first group in the
2943 list. Calling setgroups() with zero groups on a "different" system results in
2944 an error return. The following code should cope with both types of system.
2946 However, if this process isn't running as root, setgroups() can't be used
2947 since you have to be root to run it, even if throwing away groups. Not being
2948 root here happens only in some unusual configurations. We just ignore the
2951 if (setgroups(0, NULL) != 0)
2953 if (setgroups(1, group_list) != 0 && !unprivileged)
2955 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2960 /* If the configuration file name has been altered by an argument on the
2961 command line (either a new file name or a macro definition) and the caller is
2962 not root or the exim user, or if this is a filter testing run, remove any
2963 setuid privilege the program has, and run as the underlying user.
2965 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2966 severely restricts the use of -C for some purposes.
2968 Otherwise, set the real ids to the effective values (should be root unless run
2969 from inetd, which it can either be root or the exim uid, if one is configured).
2971 There is a private mechanism for bypassing some of this, in order to make it
2972 possible to test lots of configurations automatically, without having either to
2973 recompile each time, or to patch in an actual configuration file name and other
2974 values (such as the path name). If running in the test harness, pretend that
2975 configuration file changes and macro definitions haven't happened. */
2978 (config_changed || macros != NULL) && /* Config changed, and */
2979 real_uid != root_uid && /* Not root, and */
2980 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2981 real_uid != exim_uid && /* Not exim, and */
2983 !running_in_test_harness /* Not fudged */
2985 expansion_test /* expansion testing */
2987 filter_test != FTEST_NONE) /* Filter testing */
2989 setgroups(group_count, group_list);
2990 exim_setugid(real_uid, real_gid, FALSE,
2991 US"-C, -D, -be or -bf forces real uid");
2992 removed_privilege = TRUE;
2994 /* In the normal case when Exim is called like this, stderr is available
2995 and should be used for any logging information because attempts to write
2996 to the log will usually fail. To arrange this, we unset really_exim. However,
2997 if no stderr is available there is no point - we might as well have a go
2998 at the log (if it fails, syslog will be written). */
3000 if (log_stderr != NULL) really_exim = FALSE;
3003 /* Privilege is to be retained for the moment. It may be dropped later,
3004 depending on the job that this Exim process has been asked to do. For now, set
3005 the real uid to the effective so that subsequent re-execs of Exim are done by a
3008 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3010 /* If testing a filter, open the file(s) now, before wasting time doing other
3011 setups and reading the message. */
3013 if ((filter_test & FTEST_SYSTEM) != 0)
3015 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3018 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3020 return EXIT_FAILURE;
3024 if ((filter_test & FTEST_USER) != 0)
3026 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3029 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3031 return EXIT_FAILURE;
3035 /* Read the main runtime configuration data; this gives up if there
3036 is a failure. It leaves the configuration file open so that the subsequent
3037 configuration data for delivery can be read if needed. */
3041 /* Handle the decoding of logging options. */
3043 decode_bits(&log_write_selector, &log_extra_selector, log_selector_string,
3044 log_options, log_options_count, US"log");
3048 debug_printf("configuration file is %s\n", config_main_filename);
3049 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3050 log_extra_selector);
3053 /* If domain literals are not allowed, check the sender address that was
3054 supplied with -f. Ditto for a stripped trailing dot. */
3056 if (sender_address != NULL)
3058 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3060 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3061 "allowed\n", sender_address);
3062 return EXIT_FAILURE;
3064 if (f_end_dot && !strip_trailing_dot)
3066 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3067 "(trailing dot not allowed)\n", sender_address);
3068 return EXIT_FAILURE;
3072 /* Paranoia check of maximum lengths of certain strings. There is a check
3073 on the length of the log file path in log.c, which will come into effect
3074 if there are any calls to write the log earlier than this. However, if we
3075 get this far but the string is very long, it is better to stop now than to
3076 carry on and (e.g.) receive a message and then have to collapse. The call to
3077 log_write() from here will cause the ultimate panic collapse if the complete
3078 file name exceeds the buffer length. */
3080 if (Ustrlen(log_file_path) > 200)
3081 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3082 "log_file_path is longer than 200 chars: aborting");
3084 if (Ustrlen(pid_file_path) > 200)
3085 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3086 "pid_file_path is longer than 200 chars: aborting");
3088 if (Ustrlen(spool_directory) > 200)
3089 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3090 "spool_directory is longer than 200 chars: aborting");
3092 /* Length check on the process name given to syslog for its TAG field,
3093 which is only permitted to be 32 characters or less. See RFC 3164. */
3095 if (Ustrlen(syslog_processname) > 32)
3096 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3097 "syslog_processname is longer than 32 chars: aborting");
3099 /* In some operating systems, the environment variable TMPDIR controls where
3100 temporary files are created; Exim doesn't use these (apart from when delivering
3101 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3102 If TMPDIR is found in the environment, reset it to the value defined in the
3103 TMPDIR macro, if this macro is defined. */
3108 for (p = USS environ; *p != NULL; p++)
3110 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3111 Ustrcmp(*p+7, TMPDIR) != 0)
3113 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3114 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3116 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3122 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3123 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3124 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3125 called by a user who has set the TZ variable. This then affects the timestamps
3126 in log files and in Received: headers, and any created Date: header lines. The
3127 required timezone is settable in the configuration file, so nothing can be done
3128 about this earlier - but hopefully nothing will normally be logged earlier than
3129 this. We have to make a new environment if TZ is wrong, but don't bother if
3130 timestamps_utc is set, because then all times are in UTC anyway. */
3132 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3134 timestamps_utc = TRUE;
3138 uschar *envtz = US getenv("TZ");
3139 if ((envtz == NULL && timezone_string != NULL) ||
3141 (timezone_string == NULL ||
3142 Ustrcmp(timezone_string, envtz) != 0)))
3144 uschar **p = USS environ;
3148 while (*p++ != NULL) count++;
3149 if (envtz == NULL) count++;
3150 newp = new = malloc(sizeof(uschar *) * (count + 1));
3151 for (p = USS environ; *p != NULL; p++)
3153 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3156 if (timezone_string != NULL)
3158 *newp = malloc(Ustrlen(timezone_string) + 4);
3159 sprintf(CS *newp++, "TZ=%s", timezone_string);
3164 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3165 tod_stamp(tod_log));
3169 /* Handle the case when we have removed the setuid privilege because of -C or
3170 -D. This means that the caller of Exim was not root, and, provided that
3171 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3174 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3175 were running as the exim user defined in the configuration file (different to
3176 the one in the binary). The sysadmin may expect this case to retain privilege
3177 because "the binary was called by the Exim user", but it hasn't, because of the
3178 order in which it handles this stuff. There are two possibilities:
3180 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3181 to do message deliveries. Thus, the fact that it is running as a
3182 non-privileged user is plausible, and might be wanted in some special
3183 configurations. However, really_exim will have been set false when
3184 privilege was dropped, to stop Exim trying to write to its normal log
3185 files. Therefore, re-enable normal log processing, assuming the sysadmin
3186 has set up the log directory correctly.
3188 (2) If deliver_drop_privilege is not set, the configuration won't work as
3189 apparently intended, and so we log a panic message. In order to retain
3190 root for -C or -D, the caller must either be root or the Exim user
3191 defined in the binary (when deliver_drop_ privilege is false).
3193 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3194 built-in exim user or one defined in the configuration. In either event,
3195 re-enable log processing, assuming the sysadmin knows what they are doing. */
3197 if (removed_privilege && (config_changed || macros != NULL) &&
3198 real_uid == exim_uid)
3200 #ifdef ALT_CONFIG_ROOT_ONLY
3201 really_exim = TRUE; /* let logging work normally */
3204 if (deliver_drop_privilege)
3205 really_exim = TRUE; /* let logging work normally */
3207 log_write(0, LOG_MAIN|LOG_PANIC,
3208 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3209 (int)exim_uid, config_changed? "-C" : "-D");
3213 /* Start up Perl interpreter if Perl support is configured and there is a
3214 perl_startup option, and the configuration or the command line specifies
3215 initializing starting. Note that the global variables are actually called
3216 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3219 if (perl_start_option != 0)
3220 opt_perl_at_start = (perl_start_option > 0);
3221 if (opt_perl_at_start && opt_perl_startup != NULL)
3224 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3225 errstr = init_perl(opt_perl_startup);
3228 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3229 return EXIT_FAILURE;
3231 opt_perl_started = TRUE;
3233 #endif /* EXIM_PERL */
3235 /* Log the arguments of the call if the configuration file said so. This is
3236 a debugging feature for finding out what arguments certain MUAs actually use.
3237 Don't attempt it if logging is disabled, or if listing variables or if
3238 verifying/testing addresses or expansions. */
3240 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3241 && really_exim && !list_options && !checking)
3244 uschar *p = big_buffer;
3246 (void)getcwd(CS p+4, big_buffer_size - 4);
3248 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3250 for (i = 0; i < argc; i++)
3252 int len = Ustrlen(argv[i]);
3255 if (p + len + 8 >= big_buffer + big_buffer_size)
3258 log_write(0, LOG_MAIN, "%s", big_buffer);
3259 Ustrcpy(big_buffer, "...");
3262 printing = string_printing(argv[i]);
3263 if (printing[0] == 0) quote = US"\""; else
3265 uschar *pp = printing;
3267 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3269 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3270 (p - big_buffer) - 4), printing, quote);
3274 if ((log_extra_selector & LX_arguments) != 0)
3275 log_write(0, LOG_MAIN, "%s", big_buffer);
3277 debug_printf("%s\n", big_buffer);
3280 /* Set the working directory to be the top-level spool directory. We don't rely
3281 on this in the code, which always uses fully qualified names, but it's useful
3282 for core dumps etc. Don't complain if it fails - the spool directory might not
3283 be generally accessible and calls with the -C option (and others) have lost
3284 privilege by now. */
3286 if (Uchdir(spool_directory) != 0)
3288 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3289 (void)Uchdir(spool_directory);
3292 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3293 alias file. Exim doesn't have such a concept, but this call is screwed into
3294 Sun's YP makefiles. Handle this by calling a configured script, as the real
3295 user who called Exim. The -oA option can be used to pass an argument to the
3300 fclose(config_file);
3301 if (bi_command != NULL)
3305 argv[i++] = bi_command;
3306 if (alias_arg != NULL) argv[i++] = alias_arg;
3309 setgroups(group_count, group_list);
3310 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3312 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3313 (argv[1] == NULL)? US"" : argv[1]);
3315 execv(CS argv[0], (char *const *)argv);
3316 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3321 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3326 /* If an action on specific messages is requested, or if a daemon or queue
3327 runner is being started, we need to know if Exim was called by an admin user.
3328 This is the case if the real user is root or exim, or if the real group is
3329 exim, or if one of the supplementary groups is exim or a group listed in
3330 admin_groups. We don't fail all message actions immediately if not admin_user,
3331 since some actions can be performed by non-admin users. Instead, set admin_user
3332 for later interrogation. */
3334 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3340 for (i = 0; i < group_count; i++)
3342 if (group_list[i] == exim_gid) admin_user = TRUE;
3343 else if (admin_groups != NULL)
3345 for (j = 1; j <= (int)(admin_groups[0]); j++)
3346 if (admin_groups[j] == group_list[i])
3347 { admin_user = TRUE; break; }
3349 if (admin_user) break;
3353 /* Another group of privileged users are the trusted users. These are root,
3354 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3355 are permitted to specify sender_addresses with -f on the command line, and
3356 other message parameters as well. */
3358 if (real_uid == root_uid || real_uid == exim_uid)
3359 trusted_caller = TRUE;
3364 if (trusted_users != NULL)
3366 for (i = 1; i <= (int)(trusted_users[0]); i++)
3367 if (trusted_users[i] == real_uid)
3368 { trusted_caller = TRUE; break; }
3371 if (!trusted_caller && trusted_groups != NULL)
3373 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3375 if (trusted_groups[i] == real_gid)
3376 trusted_caller = TRUE;
3377 else for (j = 0; j < group_count; j++)
3379 if (trusted_groups[i] == group_list[j])
3380 { trusted_caller = TRUE; break; }
3382 if (trusted_caller) break;
3387 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3388 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3390 /* Only an admin user may start the daemon or force a queue run in the default
3391 configuration, but the queue run restriction can be relaxed. Only an admin
3392 user may request that a message be returned to its sender forthwith. Only an
3393 admin user may specify a debug level greater than D_v (because it might show
3394 passwords, etc. in lookup queries). Only an admin user may request a queue
3399 BOOL debugset = (debug_selector & ~D_v) != 0;
3400 if (deliver_give_up || daemon_listen ||
3401 (count_queue && queue_list_requires_admin) ||
3402 (list_queue && queue_list_requires_admin) ||
3403 (queue_interval >= 0 && prod_requires_admin) ||
3404 (debugset && !running_in_test_harness))
3406 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3411 /* If the real user is not root or the exim uid, the argument for passing
3412 in an open TCP/IP connection for another message is not permitted, nor is
3413 running with the -N option for any delivery action, unless this call to exim is
3414 one that supplied an input message, or we are using a patched exim for
3415 regression testing. */
3417 if (real_uid != root_uid && real_uid != exim_uid &&
3418 (continue_hostname != NULL ||
3420 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3421 )) && !running_in_test_harness)
3423 fprintf(stderr, "exim: Permission denied\n");
3424 return EXIT_FAILURE;
3427 /* If the caller is not trusted, certain arguments are ignored when running for
3428 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3429 Note that authority for performing certain actions on messages is tested in the
3430 queue_action() function. */
3432 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3434 sender_host_name = sender_host_address = interface_address =
3435 sender_ident = received_protocol = NULL;
3436 sender_host_port = interface_port = 0;
3437 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3440 /* If a sender host address is set, extract the optional port number off the
3441 end of it and check its syntax. Do the same thing for the interface address.
3442 Exim exits if the syntax is bad. */
3446 if (sender_host_address != NULL)
3447 sender_host_port = check_port(sender_host_address);
3448 if (interface_address != NULL)
3449 interface_port = check_port(interface_address);
3452 /* If an SMTP message is being received check to see if the standard input is a
3453 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3454 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3459 union sockaddr_46 inetd_sock;
3460 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3461 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3463 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3464 if (family == AF_INET || family == AF_INET6)
3466 union sockaddr_46 interface_sock;
3467 size = sizeof(interface_sock);
3469 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3470 interface_address = host_ntoa(-1, &interface_sock, NULL,
3473 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3475 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3478 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3479 NULL, &sender_host_port);
3480 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3481 "inetd is not supported when mua_wrapper is set");
3486 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3487 return EXIT_FAILURE;
3493 /* If the load average is going to be needed while receiving a message, get it
3494 now for those OS that require the first call to os_getloadavg() to be done as
3495 root. There will be further calls later for each message received. */
3497 #ifdef LOAD_AVG_NEEDS_ROOT
3498 if (receiving_message &&
3499 (queue_only_load >= 0 ||
3500 (is_inetd && smtp_load_reserve >= 0)
3503 load_average = os_getloadavg();
3507 /* The queue_only configuration option can be overridden by -odx on the command
3508 line, except that if queue_only_override is false, queue_only cannot be unset
3509 from the command line. */
3511 if (queue_only_set && (queue_only_override || arg_queue_only))
3512 queue_only = arg_queue_only;
3514 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3517 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3518 if (arg_smtp_receive_timeout >= 0)
3519 smtp_receive_timeout = arg_smtp_receive_timeout;
3521 /* If Exim was started with root privilege, unless we have already removed the
3522 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3523 except when starting the daemon or doing some kind of delivery or address
3524 testing (-bt). These are the only cases when root need to be retained. We run
3525 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3526 retained only for starting the daemon. */
3528 if (!unprivileged && /* originally had root AND */
3529 !removed_privilege && /* still got root AND */
3530 !daemon_listen && /* not starting the daemon */
3531 queue_interval <= 0 && /* (either kind of daemon) */
3533 deliver_drop_privilege || /* requested unprivileged */
3535 queue_interval < 0 && /* not running the queue */
3536 (msg_action_arg < 0 || /* and */
3537 msg_action != MSG_DELIVER) && /* not delivering and */
3538 (!checking || !address_test_mode) /* not address checking */
3542 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3545 /* When we are retaining a privileged uid, we still change to the exim gid. */
3547 else setgid(exim_gid);
3549 /* Handle a request to list the delivery queue */
3553 set_process_info("listing the queue");
3554 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3558 /* Handle a request to count the delivery queue */
3562 set_process_info("counting the queue");
3567 /* Handle actions on specific messages, except for the force delivery action,
3568 which is done below. Some actions take a whole list of message ids, which
3569 are known to continue up to the end of the arguments. Others take a single
3570 message id and then operate on the recipients list. */
3572 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3574 int yield = EXIT_SUCCESS;
3575 set_process_info("acting on specified messages");
3577 if (!one_msg_action)
3579 for (i = msg_action_arg; i < argc; i++)
3580 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3581 yield = EXIT_FAILURE;
3584 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3585 recipients_arg)) yield = EXIT_FAILURE;
3589 /* All the modes below here require the remaining configuration sections
3590 to be read, except that we can skip over the ACL setting when delivering
3591 specific messages, or doing a queue run. (For various testing cases we could
3592 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3595 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3597 /* The configuration data will have been read into POOL_PERM because we won't
3598 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3599 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3600 configuration were read into POOL_MAIN, because we don't do any resets till
3601 later on. However, it seems right, and it does ensure that both pools get used.
3604 store_pool = POOL_MAIN;
3606 /* Handle the -brt option. This is for checking out retry configurations.
3607 The next three arguments are a domain name or a complete address, and
3608 optionally two error numbers. All it does is to call the function that
3609 scans the retry configuration data. */
3611 if (test_retry_arg >= 0)
3613 retry_config *yield;
3614 int basic_errno = 0;
3618 if (test_retry_arg >= argc)
3620 printf("-brt needs a domain or address argument\n");
3621 exim_exit(EXIT_FAILURE);
3623 s1 = argv[test_retry_arg++];
3626 /* If the first argument contains no @ and no . it might be a local user
3627 or it might be a single-component name. Treat as a domain. */
3629 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3631 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3632 "being \ntreated as a one-component domain, not as a local part.\n\n",
3636 /* There may be an optional second domain arg. */
3638 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3639 s2 = argv[test_retry_arg++];
3641 /* The final arg is an error name */
3643 if (test_retry_arg < argc)
3645 uschar *ss = argv[test_retry_arg];
3647 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3650 printf("%s\n", CS error);
3651 return EXIT_FAILURE;
3654 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3655 an error is for matching codes to the decade. Turn them into a real error
3656 code, off the decade. */
3658 if (basic_errno == ERRNO_RCPT4XX)
3660 int code = (more_errno >> 8) & 255;
3662 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3663 else if (code > 100)
3664 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3668 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3669 if (yield == NULL) printf("No retry information found\n"); else
3672 more_errno = yield->more_errno;
3673 printf("Retry rule: %s ", yield->pattern);
3675 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3677 printf("quota%s%s ",
3678 (more_errno > 0)? "_" : "",
3679 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3681 else if (yield->basic_errno == ECONNREFUSED)
3683 printf("refused%s%s ",
3684 (more_errno > 0)? "_" : "",
3685 (more_errno == 'M')? "MX" :
3686 (more_errno == 'A')? "A" : "");
3688 else if (yield->basic_errno == ETIMEDOUT)
3691 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3693 if (more_errno != 0) printf("_%s",
3694 (more_errno == 'M')? "MX" : "A");
3697 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3698 printf("auth_failed ");
3701 for (r = yield->rules; r != NULL; r = r->next)
3703 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3704 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3710 printf(",%d.", x/1000);
3724 exim_exit(EXIT_SUCCESS);
3727 /* Handle a request to list one or more configuration options */
3731 set_process_info("listing variables");
3732 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3733 else for (i = recipients_arg; i < argc; i++)
3736 (Ustrcmp(argv[i], "router") == 0 ||
3737 Ustrcmp(argv[i], "transport") == 0 ||
3738 Ustrcmp(argv[i], "authenticator") == 0))
3740 readconf_print(argv[i+1], argv[i]);
3743 else readconf_print(argv[i], NULL);
3745 exim_exit(EXIT_SUCCESS);
3749 /* Handle a request to deliver one or more messages that are already on the
3750 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3751 is typically used for a small number when prodding by hand (when the option
3752 forced_delivery will be set) or when re-execing to regain root privilege.
3753 Each message delivery must happen in a separate process, so we fork a process
3754 for each one, and run them sequentially so that debugging output doesn't get
3755 intertwined, and to avoid spawning too many processes if a long list is given.
3756 However, don't fork for the last one; this saves a process in the common case
3757 when Exim is called to deliver just one message. */
3759 if (msg_action_arg > 0)
3761 if (prod_requires_admin && !admin_user)
3763 fprintf(stderr, "exim: Permission denied\n");
3764 exim_exit(EXIT_FAILURE);
3766 set_process_info("delivering specified messages");
3767 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3768 for (i = msg_action_arg; i < argc; i++)
3773 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3774 else if ((pid = fork()) == 0)
3776 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3777 _exit(EXIT_SUCCESS);
3781 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3783 exim_exit(EXIT_FAILURE);
3787 exim_exit(EXIT_SUCCESS);
3791 /* If only a single queue run is requested, without SMTP listening, we can just
3792 turn into a queue runner, with an optional starting message id. */
3794 if (queue_interval == 0 && !daemon_listen)
3796 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3797 (start_queue_run_id == NULL)? US"" : US" starting at ",
3798 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3799 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3800 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3801 set_process_info("running the queue (single queue run)");
3802 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3803 exim_exit(EXIT_SUCCESS);
3807 /* Find the login name of the real user running this process. This is always
3808 needed when receiving a message, because it is written into the spool file. It
3809 may also be used to construct a from: or a sender: header, and in this case we
3810 need the user's full name as well, so save a copy of it, checked for RFC822
3811 syntax and munged if necessary, if it hasn't previously been set by the -F
3812 argument. We may try to get the passwd entry more than once, in case NIS or
3813 other delays are in evidence. Save the home directory for use in filter testing
3818 if ((pw = getpwuid(real_uid)) != NULL)
3820 originator_login = string_copy(US pw->pw_name);
3821 originator_home = string_copy(US pw->pw_dir);
3823 /* If user name has not been set by -F, set it from the passwd entry
3824 unless -f has been used to set the sender address by a trusted user. */
3826 if (originator_name == NULL)
3828 if (sender_address == NULL ||
3829 (!trusted_caller && filter_test == FTEST_NONE))
3831 uschar *name = US pw->pw_gecos;
3832 uschar *amp = Ustrchr(name, '&');
3835 /* Most Unix specify that a '&' character in the gecos field is
3836 replaced by a copy of the login name, and some even specify that
3837 the first character should be upper cased, so that's what we do. */
3842 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3843 amp - name, name, &loffset, originator_login, amp + 1);
3844 buffer[loffset] = toupper(buffer[loffset]);
3848 /* If a pattern for matching the gecos field was supplied, apply
3849 it and then expand the name string. */
3851 if (gecos_pattern != NULL && gecos_name != NULL)
3854 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3856 if (regex_match_and_setup(re, name, 0, -1))
3858 uschar *new_name = expand_string(gecos_name);
3860 if (new_name != NULL)
3862 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3863 "gecos field \"%s\"\n", new_name, name);
3866 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3867 "\"%s\": %s\n", gecos_name, expand_string_message);
3869 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3870 "gecos field \"%s\"\n", gecos_pattern, name);
3871 store_free((void *)re);
3873 originator_name = string_copy(name);
3876 /* A trusted caller has used -f but not -F */
3878 else originator_name = US"";
3881 /* Break the retry loop */
3886 if (++i > finduser_retries) break;
3890 /* If we cannot get a user login, log the incident and give up, unless the
3891 configuration specifies something to use. When running in the test harness,
3892 any setting of unknown_login overrides the actual login name. */
3894 if (originator_login == NULL || running_in_test_harness)
3896 if (unknown_login != NULL)
3898 originator_login = expand_string(unknown_login);
3899 if (originator_name == NULL && unknown_username != NULL)
3900 originator_name = expand_string(unknown_username);
3901 if (originator_name == NULL) originator_name = US"";
3903 if (originator_login == NULL)
3904 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3908 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3911 originator_name = string_copy(parse_fix_phrase(originator_name,
3912 Ustrlen(originator_name), big_buffer, big_buffer_size));
3914 /* If a message is created by this call of Exim, the uid/gid of its originator
3915 are those of the caller. These values are overridden if an existing message is
3916 read in from the spool. */
3918 originator_uid = real_uid;
3919 originator_gid = real_gid;
3921 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3922 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3924 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3925 returns. We leave this till here so that the originator_ fields are available
3926 for incoming messages via the daemon. */
3928 if (daemon_listen || queue_interval > 0)
3930 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3931 "run when mua_wrapper is set");
3935 /* If the sender ident has not been set (by a trusted caller) set it to
3936 the caller. This will get overwritten below for an inetd call. If a trusted
3937 caller has set it empty, unset it. */
3939 if (sender_ident == NULL) sender_ident = originator_login;
3940 else if (sender_ident[0] == 0) sender_ident = NULL;
3942 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3943 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3944 originator_* variables set. */
3946 if (test_rewrite_arg >= 0)
3948 really_exim = FALSE;
3949 if (test_rewrite_arg >= argc)
3951 printf("-brw needs an address argument\n");
3952 exim_exit(EXIT_FAILURE);
3954 rewrite_test(argv[test_rewrite_arg]);
3955 exim_exit(EXIT_SUCCESS);
3958 /* A locally-supplied message is considered to be coming from a local user
3959 unless a trusted caller supplies a sender address with -f, or is passing in the
3960 message via SMTP (inetd invocation or otherwise). */
3962 if ((sender_address == NULL && !smtp_input) ||
3963 (!trusted_caller && filter_test == FTEST_NONE))
3965 sender_local = TRUE;
3967 /* A trusted caller can supply authenticated_sender and authenticated_id
3968 via -oMas and -oMai and if so, they will already be set. */
3970 if (authenticated_sender == NULL)
3971 authenticated_sender = string_sprintf("%s@%s", originator_login,
3972 qualify_domain_sender);
3973 if (authenticated_id == NULL) authenticated_id = originator_login;
3976 /* Trusted callers are always permitted to specify the sender address.
3977 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3978 is specified is the empty address. However, if a trusted caller does not
3979 specify a sender address for SMTP input, we leave sender_address unset. This
3980 causes the MAIL commands to be honoured. */
3982 if ((!smtp_input && sender_address == NULL) ||
3983 !receive_check_set_sender(sender_address))
3985 /* Either the caller is not permitted to set a general sender, or this is
3986 non-SMTP input and the trusted caller has not set a sender. If there is no
3987 sender, or if a sender other than <> is set, override with the originator's
3988 login (which will get qualified below), except when checking things. */
3990 if (sender_address == NULL /* No sender_address set */
3992 (sender_address[0] != 0 && /* Non-empty sender address, AND */
3993 !checking && /* Not running tests, AND */
3994 filter_test == FTEST_NONE)) /* Not testing a filter */
3996 sender_address = originator_login;
3997 sender_address_forced = FALSE;
3998 sender_address_domain = 0;
4002 /* Remember whether an untrusted caller set the sender address */
4004 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4006 /* Ensure that the sender address is fully qualified unless it is the empty
4007 address, which indicates an error message, or doesn't exist (root caller, smtp
4008 interface, no -f argument). */
4010 if (sender_address != NULL && sender_address[0] != 0 &&
4011 sender_address_domain == 0)
4012 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4013 qualify_domain_sender);
4015 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4017 /* Handle a request to verify a list of addresses, or test them for delivery.
4018 This must follow the setting of the sender address, since routers can be
4019 predicated upon the sender. If no arguments are given, read addresses from
4020 stdin. Set debug_level to at least D_v to get full output for address testing.
4023 if (verify_address_mode || address_test_mode)
4026 int flags = vopt_qualify;
4028 if (verify_address_mode)
4030 if (!verify_as_sender) flags |= vopt_is_recipient;
4031 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4036 flags |= vopt_is_recipient;
4037 debug_selector |= D_v;
4038 debug_file = stderr;
4039 debug_fd = fileno(debug_file);
4040 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4043 if (recipients_arg < argc)
4045 while (recipients_arg < argc)
4047 uschar *s = argv[recipients_arg++];
4050 BOOL finished = FALSE;
4051 uschar *ss = parse_find_address_end(s, FALSE);
4052 if (*ss == ',') *ss = 0; else finished = TRUE;
4053 test_address(s, flags, &exit_value);
4056 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4063 uschar *s = get_stdinput(NULL, NULL);
4064 if (s == NULL) break;
4065 test_address(s, flags, &exit_value);
4069 exim_exit(exit_value);
4072 /* Handle expansion checking */
4076 if (recipients_arg < argc)
4078 while (recipients_arg < argc)
4080 uschar *s = argv[recipients_arg++];
4081 uschar *ss = expand_string(s);
4083 printf ("Failed: %s\n", expand_string_message);
4084 else printf("%s\n", CS ss);
4092 char *(*fn_readline)(char *) = NULL;
4093 char *(*fn_addhist)(char *) = NULL;
4096 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4102 uschar *source = get_stdinput(fn_readline, fn_addhist);
4103 if (source == NULL) break;
4104 ss = expand_string(source);
4106 printf ("Failed: %s\n", expand_string_message);
4107 else printf("%s\n", CS ss);
4111 if (dlhandle != NULL) dlclose(dlhandle);
4115 exim_exit(EXIT_SUCCESS);
4119 /* The active host name is normally the primary host name, but it can be varied
4120 for hosts that want to play several parts at once. We need to ensure that it is
4121 set for host checking, and for receiving messages. */
4123 smtp_active_hostname = primary_hostname;
4124 if (raw_active_hostname != NULL)
4126 uschar *nah = expand_string(raw_active_hostname);
4129 if (!expand_string_forcedfail)
4130 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4131 "(smtp_active_hostname): %s", raw_active_hostname,
4132 expand_string_message);
4134 else if (nah[0] != 0) smtp_active_hostname = nah;
4137 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4138 given IP address so that the blocking and relay configuration can be tested. An
4139 RFC 1413 call is made only if we are running in the test harness and an
4140 incoming interface and both ports are specified, because there is no TCP/IP
4141 call to find the ident for. */
4148 sender_ident = NULL;
4149 if (running_in_test_harness && sender_host_port != 0 &&
4150 interface_address != NULL && interface_port != 0)
4151 verify_get_ident(1413);
4153 /* In case the given address is a non-canonical IPv6 address, canonicize
4154 it. The code works for both IPv4 and IPv6, as it happens. */
4156 size = host_aton(sender_host_address, x);
4157 sender_host_address = store_get(48); /* large enough for full IPv6 */
4158 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4160 /* Now set up for testing */
4162 host_build_sender_fullhost();
4166 sender_local = FALSE;
4167 sender_host_notsocket = TRUE;
4168 debug_file = stderr;
4169 debug_fd = fileno(debug_file);
4170 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4171 "**** but without any ident (RFC 1413) callback.\n"
4172 "**** This is not for real!\n\n",
4173 sender_host_address);
4175 if (verify_check_host(&hosts_connection_nolog) == OK)
4176 log_write_selector &= ~L_smtp_connection;
4177 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4179 if (smtp_start_session())
4181 reset_point = store_get(0);
4184 store_reset(reset_point);
4185 if (smtp_setup_msg() <= 0) break;
4186 if (!receive_msg(FALSE)) break;
4189 exim_exit(EXIT_SUCCESS);
4193 /* Arrange for message reception if recipients or SMTP were specified;
4194 otherwise complain unless a version print (-bV) happened or this is a filter
4195 verification test. In the former case, show the configuration file name. */
4197 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4199 if (version_printed)
4201 printf("Configuration file is %s\n", config_main_filename);
4202 return EXIT_SUCCESS;
4204 if (filter_test == FTEST_NONE)
4207 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4208 "not directly from a shell command line. Options and/or arguments control\n"
4209 "what it does when called. For a list of options, see the Exim documentation.\n");
4210 return EXIT_FAILURE;
4215 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4216 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4217 that we are not called from inetd, because that is rejected above. The
4218 following configuration settings are forced here:
4220 (1) Synchronous delivery (-odi)
4221 (2) Errors to stderr (-oep == -oeq)
4222 (3) No parallel remote delivery
4223 (4) Unprivileged delivery
4225 We don't force overall queueing options because there are several of them;
4226 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4227 to override any SMTP queueing. */
4231 synchronous_delivery = TRUE;
4232 arg_error_handling = ERRORS_STDERR;
4233 remote_max_parallel = 1;
4234 deliver_drop_privilege = TRUE;
4236 queue_smtp_domains = NULL;
4240 /* Prepare to accept one or more new messages on the standard input. When a
4241 message has been read, its id is returned in message_id[]. If doing immediate
4242 delivery, we fork a delivery process for each received message, except for the
4243 last one, where we can save a process switch.
4245 It is only in non-smtp mode that error_handling is allowed to be changed from
4246 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4247 sendmail error modes other than -oem ever actually used? Later: yes.) */
4249 if (!smtp_input) error_handling = arg_error_handling;
4251 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4252 logging being sent down the socket and make an identd call to get the
4258 exim_nullstd(); /* Re-open to /dev/null */
4259 verify_get_ident(IDENT_PORT);
4260 host_build_sender_fullhost();
4261 set_process_info("handling incoming connection from %s via inetd",
4265 /* If the sender host address has been set, build sender_fullhost if it hasn't
4266 already been done (which it will have been for inetd). This caters for the
4267 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4268 so that the test for IP options is skipped for -bs input. */
4270 if (sender_host_address != NULL && sender_fullhost == NULL)
4272 host_build_sender_fullhost();
4273 set_process_info("handling incoming connection from %s via -oMa",
4275 sender_host_notsocket = TRUE;
4278 /* Otherwise, set the sender host as unknown except for inetd calls. This
4279 prevents host checking in the case of -bs not from inetd and also for -bS. */
4281 else if (!is_inetd) sender_host_unknown = TRUE;
4283 /* If stdout does not exist, then dup stdin to stdout. This can happen
4284 if exim is started from inetd. In this case fd 0 will be set to the socket,
4285 but fd 1 will not be set. This also happens for passed SMTP channels. */
4287 if (fstat(1, &statbuf) < 0) dup2(0, 1);
4289 /* Set up the incoming protocol name and the state of the program. Root
4290 is allowed to force received protocol via the -oMr option above, and if we are
4291 in a non-local SMTP state it means we have come via inetd and the process info
4292 has already been set up. We don't set received_protocol here for smtp input,
4293 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4297 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4302 if (received_protocol == NULL)
4303 received_protocol = string_sprintf("local%s", called_as);
4304 set_process_info("accepting a local non-SMTP message from <%s>",
4308 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4312 local_queue_only = queue_only;
4314 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4315 the spool if so configured. On failure, we must not attempt to send an error
4316 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4317 error code is given.) */
4319 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4321 fprintf(stderr, "exim: insufficient disk space\n");
4322 return EXIT_FAILURE;
4325 /* If this is smtp input of any kind, handle the start of the SMTP
4332 if (verify_check_host(&hosts_connection_nolog) == OK)
4333 log_write_selector &= ~L_smtp_connection;
4334 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4335 if (!smtp_start_session())
4338 exim_exit(EXIT_SUCCESS);
4342 /* Otherwise, set up the input size limit here */
4346 thismessage_size_limit = expand_string_integer(message_size_limit);
4347 if (thismessage_size_limit < 0)
4349 if (thismessage_size_limit == -1)
4350 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4351 "message_size_limit: %s", expand_string_message);
4353 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4354 "message_size_limit: %s", expand_string_message);
4358 /* Loop for several messages when reading SMTP input. If we fork any child
4359 processes, we don't want to wait for them unless synchronous delivery is
4360 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4361 same as SIG_DFL, despite the fact that documentation often lists the default as
4362 "ignore". This is a confusing area. This is what I know:
4364 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4365 processes that complete simply to go away without ever becoming defunct. You
4366 can't then wait for them - but we don't want to wait for them in the
4367 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4368 happen for all OS (e.g. *BSD is different).
4370 But that's not the end of the story. Some (many? all?) systems have the
4371 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4372 has by default, so it seems that the difference is merely one of default
4373 (compare restarting vs non-restarting signals).
4375 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4376 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4377 of the loop below. Paranoia rules.
4379 February 2003: That's *still* not the end of the story. There are now versions
4380 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4381 process then calls waitpid(), a grumble is written to the system log, because
4382 this is logically inconsistent. In other words, it doesn't like the paranoia.
4383 As a consequenc of this, the waitpid() below is now excluded if we are sure
4384 that SIG_IGN works. */
4386 if (!synchronous_delivery)
4389 struct sigaction act;
4390 act.sa_handler = SIG_IGN;
4391 sigemptyset(&(act.sa_mask));
4392 act.sa_flags = SA_NOCLDWAIT;
4393 sigaction(SIGCHLD, &act, NULL);
4395 signal(SIGCHLD, SIG_IGN);
4399 /* Save the current store pool point, for resetting at the start of
4400 each message, and save the real sender address, if any. */
4402 reset_point = store_get(0);
4403 real_sender_address = sender_address;
4405 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4406 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4411 store_reset(reset_point);
4414 /* In the SMTP case, we have to handle the initial SMTP input and build the
4415 recipients list, before calling receive_msg() to read the message proper.
4416 Whatever sender address is actually given in the SMTP transaction is
4417 actually ignored for local senders - we use the actual sender, which is
4418 normally either the underlying user running this process or a -f argument
4419 provided by a trusted caller. It is saved in real_sender_address.
4421 However, if this value is NULL, we are dealing with a trusted caller when
4422 -f was not used; in this case, the SMTP sender is allowed to stand.
4424 Also, if untrusted_set_sender is set, we permit sender addresses that match
4425 anything in its list.
4427 The variable raw_sender_address holds the sender address before rewriting. */
4432 if ((rc = smtp_setup_msg()) > 0)
4434 if (real_sender_address != NULL &&
4435 !receive_check_set_sender(sender_address))
4437 sender_address = raw_sender = real_sender_address;
4438 sender_address_unrewritten = NULL;
4440 more = receive_msg(extract_recipients);
4441 if (message_id[0] == 0)
4444 exim_exit(EXIT_FAILURE);
4447 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4450 /* In the non-SMTP case, we have all the information from the command
4451 line, but must process it in case it is in the more general RFC822
4452 format, and in any case, to detect syntax errors. Also, it appears that
4453 the use of comma-separated lists as single arguments is common, so we
4454 had better support them. */
4460 int count = argc - recipients_arg;
4461 uschar **list = argv + recipients_arg;
4463 /* These options cannot be changed dynamically for non-SMTP messages */
4465 active_local_sender_retain = local_sender_retain;
4466 active_local_from_check = local_from_check;
4468 /* Save before any rewriting */
4470 raw_sender = string_copy(sender_address);
4472 /* Loop for each argument */
4474 for (i = 0; i < count; i++)
4476 int start, end, domain;
4478 uschar *s = list[i];
4480 /* Loop for each comma-separated address */
4484 BOOL finished = FALSE;
4486 uschar *ss = parse_find_address_end(s, FALSE);
4488 if (*ss == ',') *ss = 0; else finished = TRUE;
4490 /* Check max recipients - if -t was used, these aren't recipients */
4492 if (recipients_max > 0 && ++rcount > recipients_max &&
4493 !extract_recipients)
4495 if (error_handling == ERRORS_STDERR)
4497 fprintf(stderr, "exim: too many recipients\n");
4498 exim_exit(EXIT_FAILURE);
4503 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4504 errors_sender_rc : EXIT_FAILURE;
4509 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4511 if (domain == 0 && !allow_unqualified_recipient)
4514 errmess = US"unqualified recipient address not allowed";
4517 if (recipient == NULL)
4519 if (error_handling == ERRORS_STDERR)
4521 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4522 string_printing(list[i]), errmess);
4523 exim_exit(EXIT_FAILURE);
4529 eblock.text1 = string_printing(list[i]);
4530 eblock.text2 = errmess;
4532 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4533 errors_sender_rc : EXIT_FAILURE;
4537 receive_add_recipient(recipient, -1);
4540 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4544 /* Show the recipients when debugging */
4549 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4550 if (recipients_list != NULL)
4552 debug_printf("Recipients:\n");
4553 for (i = 0; i < recipients_count; i++)
4554 debug_printf(" %s\n", recipients_list[i].address);
4558 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4559 will just read the headers for the message, and not write anything onto the
4562 message_ended = END_NOTENDED;
4563 more = receive_msg(extract_recipients);
4565 /* more is always FALSE here (not SMTP message) when reading a message
4566 for real; when reading the headers of a message for filter testing,
4567 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4569 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4570 } /* Non-SMTP message reception */
4572 /* If this is a filter testing run, there are headers in store, but
4573 no message on the spool. Run the filtering code in testing mode, setting
4574 the domain to the qualify domain and the local part to the current user,
4575 unless they have been set by options. The prefix and suffix are left unset
4576 unless specified. The the return path is set to to the sender unless it has
4577 already been set from a return-path header in the message. */
4579 if (filter_test != FTEST_NONE)
4581 deliver_domain = (ftest_domain != NULL)?
4582 ftest_domain : qualify_domain_recipient;
4583 deliver_domain_orig = deliver_domain;
4584 deliver_localpart = (ftest_localpart != NULL)?
4585 ftest_localpart : originator_login;
4586 deliver_localpart_orig = deliver_localpart;
4587 deliver_localpart_prefix = ftest_prefix;
4588 deliver_localpart_suffix = ftest_suffix;
4589 deliver_home = originator_home;
4591 if (return_path == NULL)
4593 printf("Return-path copied from sender\n");
4594 return_path = string_copy(sender_address);
4598 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4600 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4602 receive_add_recipient(
4603 string_sprintf("%s%s%s@%s",
4604 (ftest_prefix == NULL)? US"" : ftest_prefix,
4606 (ftest_suffix == NULL)? US"" : ftest_suffix,
4607 deliver_domain), -1);
4609 printf("Recipient = %s\n", recipients_list[0].address);
4610 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4611 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4613 chdir("/"); /* Get away from wherever the user is running this from */
4615 /* Now we run either a system filter test, or a user filter test, or both.
4616 In the latter case, headers added by the system filter will persist and be
4617 available to the user filter. We need to copy the filter variables
4620 if ((filter_test & FTEST_SYSTEM) != 0)
4622 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4623 exim_exit(EXIT_FAILURE);
4626 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4628 if ((filter_test & FTEST_USER) != 0)
4630 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4631 exim_exit(EXIT_FAILURE);
4634 exim_exit(EXIT_SUCCESS);
4637 /* Else act on the result of message reception. We should not get here unless
4638 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4639 TRUE. If it is not, check on the number of messages received in this
4640 connection. If that's OK and queue_only_load is set, check that the load
4641 average is below it. If it is not, set local_queue_only TRUE. Note that it
4642 then remains this way for any subsequent messages on the same SMTP connection.
4643 This is a deliberate choice; even though the load average may fall, it
4644 doesn't seem right to deliver later messages on the same call when not
4645 delivering earlier ones. */
4647 if (!local_queue_only)
4649 if (smtp_accept_queue_per_connection > 0 &&
4650 receive_messagecount > smtp_accept_queue_per_connection)
4652 local_queue_only = TRUE;
4653 queue_only_reason = 2;
4655 else if (queue_only_load >= 0)
4657 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4658 if (local_queue_only) queue_only_reason = 3;
4662 /* If running as an MUA wrapper, all queueing options and freezing options
4666 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4668 /* Log the queueing here, when it will get a message id attached, but
4669 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4672 if (local_queue_only) switch(queue_only_reason)
4675 log_write(L_delay_delivery,
4676 LOG_MAIN, "no immediate delivery: more than %d messages "
4677 "received in one connection", smtp_accept_queue_per_connection);
4681 log_write(L_delay_delivery,
4682 LOG_MAIN, "no immediate delivery: load average %.2f",
4683 (double)load_average/1000.0);
4687 /* Else do the delivery unless the ACL or local_scan() called for queue only
4688 or froze the message. Always deliver in a separate process. A fork failure is
4689 not a disaster, as the delivery will eventually happen on a subsequent queue
4690 run. The search cache must be tidied before the fork, as the parent will
4691 do it before exiting. The child will trigger a lookup failure and
4692 thereby defer the delivery if it tries to use (for example) a cached ldap
4693 connection that the parent has called unbind on. */
4695 else if (!queue_only_policy && !deliver_freeze)
4700 if ((pid = fork()) == 0)
4703 close_unwanted(); /* Close unwanted file descriptors and TLS */
4704 exim_nullstd(); /* Ensure std{in,out,err} exist */
4706 /* Occasionally in the test harness we don't have synchronous delivery
4707 set (can happen with bounces). In that case, let the old process finish
4708 before continuing, to keep the debug output the same. */
4710 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4712 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4713 mode, deliver_drop_privilege is forced TRUE). */
4715 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4717 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4719 /* Control does not return here. */
4722 /* No need to re-exec */
4724 rc = deliver_message(message_id, FALSE, FALSE);
4726 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4727 EXIT_SUCCESS : EXIT_FAILURE);
4732 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4733 "process: %s", strerror(errno));
4736 /* In the parent, wait if synchronous delivery is required. This will
4737 always be the case in MUA wrapper mode. */
4739 else if (synchronous_delivery)
4742 while (wait(&status) != pid);
4743 if ((status & 0x00ff) != 0)
4744 log_write(0, LOG_MAIN|LOG_PANIC,
4745 "process %d crashed with signal %d while delivering %s",
4746 (int)pid, status & 0x00ff, message_id);
4747 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4751 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4752 automatically reaps children (see comments above the loop), clear away any
4753 finished subprocesses here, in case there are lots of messages coming in
4754 from the same source. */
4756 #ifndef SIG_IGN_WORKS
4757 while (waitpid(-1, NULL, WNOHANG) > 0);
4761 exim_exit(EXIT_SUCCESS); /* Never returns */
4762 return 0; /* To stop compiler warning */