1 /* $Cambridge: exim/src/src/exim.c,v 1.21 2005/06/27 14:29:04 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) (void)dup2(devnull, i);
412 if (devnull > 2) (void)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 (void)close(fileno(smtp_in));
463 (void)close(fileno(smtp_out));
468 (void)close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address, and terminates it before the
590 port data when a port is extracted.
593 address the address, with possible port on the end
595 Returns: the port, or zero if there isn't one
596 bombs out on a syntax error
600 check_port(uschar *address)
602 int port = host_extract_port(address);
603 if (string_is_ip_address(address, NULL) == 0)
605 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
613 /*************************************************
614 * Test/verify an address *
615 *************************************************/
617 /* This function is called by the -bv and -bt code. It extracts a working
618 address from a full RFC 822 address. This isn't really necessary per se, but it
619 has the effect of collapsing source routes.
623 flags flag bits for verify_address()
624 exit_value to be set for failures
630 test_address(uschar *s, int flags, int *exit_value)
632 int start, end, domain;
633 uschar *parse_error = NULL;
634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
638 fprintf(stdout, "syntax error: %s\n", parse_error);
643 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
644 -1, -1, NULL, NULL, NULL);
645 if (rc == FAIL) *exit_value = 2;
646 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
652 /*************************************************
653 * Decode bit settings for log/debug *
654 *************************************************/
656 /* This function decodes a string containing bit settings in the form of +name
657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
658 also recognizes a numeric setting of the form =<number>, but this is not
659 intended for user use. It's an easy way for Exim to pass the debug settings
660 when it is re-exec'ed.
662 The log options are held in two unsigned ints (because there became too many
663 for one). The top bit in the table means "put in 2nd selector". This does not
664 yet apply to debug options, so the "=" facility sets only the first selector.
666 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
667 It sets all the bits in both selectors. However, there is a facility for then
668 unsetting certain bits, because we want to turn off "memory" in the debug case.
670 A bad value for a debug setting is treated as an unknown option - error message
671 to stderr and die. For log settings, which come from the configuration file,
672 we write to the log on the way out...
675 selector1 address of the first bit string
676 selector2 address of the second bit string, or NULL
677 notall1 bits to exclude from "all" for selector1
678 notall2 bits to exclude from "all" for selector2
679 string the configured string
680 options the table of option names
682 which "log" or "debug"
684 Returns: nothing on success - bomb out on failure
688 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
689 int notall2, uschar *string, bit_table *options, int count, uschar *which)
692 if (string == NULL) return;
696 char *end; /* Not uschar */
697 *selector1 = strtoul(CS string+1, &end, 0);
698 if (*end == 0) return;
699 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
704 /* Handle symbolic setting */
711 bit_table *start, *end;
713 while (isspace(*string)) string++;
714 if (*string == 0) return;
716 if (*string != '+' && *string != '-')
718 errmsg = string_sprintf("malformed %s_selector setting: "
719 "+ or - expected but found \"%s\"", which, string);
723 adding = *string++ == '+';
725 while (isalnum(*string) || *string == '_') string++;
729 end = options + count;
733 bit_table *middle = start + (end - start)/2;
734 int c = Ustrncmp(s, middle->name, len);
737 if (middle->name[len] != 0) c = -1; else
739 unsigned int bit = middle->bit;
740 unsigned int *selector;
742 /* The value with all bits set means "force all bits in both selectors"
743 in the case where two are being handled. However, the top bit in the
744 second selector is never set. When setting, some bits can be excluded.
747 if (bit == 0xffffffff)
751 *selector1 = 0xffffffff ^ notall1;
752 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
757 if (selector2 != NULL) *selector2 = 0;
761 /* Otherwise, the 0x80000000 bit means "this value, without the top
762 bit, belongs in the second selector". */
766 if ((bit & 0x80000000) != 0)
768 selector = selector2;
771 else selector = selector1;
772 if (adding) *selector |= bit; else *selector &= ~bit;
774 break; /* Out of loop to match selector name */
777 if (c < 0) end = middle; else start = middle + 1;
778 } /* Loop to match selector name */
782 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
783 adding? '+' : '-', len, s);
786 } /* Loop for selector names */
788 /* Handle disasters */
791 if (Ustrcmp(which, "debug") == 0)
793 fprintf(stderr, "exim: %s\n", errmsg);
796 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
801 /*************************************************
802 * Show supported features *
803 *************************************************/
805 /* This function is called for -bV and for -d to output the optional features
806 of the current Exim binary.
808 Arguments: a FILE for printing
813 show_whats_supported(FILE *f)
815 #ifdef DB_VERSION_STRING
816 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
817 #elif defined(BTREEVERSION) && defined(HASHVERSION)
819 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
821 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
823 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
824 fprintf(f, "Probably ndbm\n");
825 #elif defined(USE_TDB)
826 fprintf(f, "Using tdb\n");
829 fprintf(f, "Probably GDBM (native mode)\n");
831 fprintf(f, "Probably GDBM (compatibility mode)\n");
835 fprintf(f, "Support for:");
837 fprintf(f, " iconv()");
849 fprintf(f, " Expand_dlfunc");
851 #ifdef USE_TCP_WRAPPERS
852 fprintf(f, " TCPwrappers");
856 fprintf(f, " GnuTLS");
858 fprintf(f, " OpenSSL");
861 #ifdef WITH_CONTENT_SCAN
862 fprintf(f, " Content_Scanning");
864 #ifdef WITH_OLD_DEMIME
865 fprintf(f, " Old_Demime");
867 #ifdef EXPERIMENTAL_SPF
868 fprintf(f, " Experimental_SPF");
870 #ifdef EXPERIMENTAL_SRS
871 fprintf(f, " Experimental_SRS");
873 #ifdef EXPERIMENTAL_BRIGHTMAIL
874 fprintf(f, " Experimental_Brightmail");
876 #ifdef EXPERIMENTAL_DOMAINKEYS
877 fprintf(f, " Experimental_DomainKeys");
881 fprintf(f, "Lookups:");
882 #ifdef LOOKUP_LSEARCH
883 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
889 fprintf(f, " dbm dbmnz");
892 fprintf(f, " dnsdb");
894 #ifdef LOOKUP_DSEARCH
895 fprintf(f, " dsearch");
898 fprintf(f, " ibase");
901 fprintf(f, " ldap ldapdn ldapm");
904 fprintf(f, " mysql");
907 fprintf(f, " nis nis0");
909 #ifdef LOOKUP_NISPLUS
910 fprintf(f, " nisplus");
913 fprintf(f, " oracle");
916 fprintf(f, " passwd");
919 fprintf(f, " pgsql");
922 fprintf(f, " testdb");
925 fprintf(f, " whoson");
929 fprintf(f, "Authenticators:");
931 fprintf(f, " cram_md5");
933 #ifdef AUTH_CYRUS_SASL
934 fprintf(f, " cyrus_sasl");
936 #ifdef AUTH_PLAINTEXT
937 fprintf(f, " plaintext");
944 fprintf(f, "Routers:");
946 fprintf(f, " accept");
948 #ifdef ROUTER_DNSLOOKUP
949 fprintf(f, " dnslookup");
951 #ifdef ROUTER_IPLITERAL
952 fprintf(f, " ipliteral");
954 #ifdef ROUTER_IPLOOKUP
955 fprintf(f, " iplookup");
957 #ifdef ROUTER_MANUALROUTE
958 fprintf(f, " manualroute");
960 #ifdef ROUTER_QUERYPROGRAM
961 fprintf(f, " queryprogram");
963 #ifdef ROUTER_REDIRECT
964 fprintf(f, " redirect");
968 fprintf(f, "Transports:");
969 #ifdef TRANSPORT_APPENDFILE
970 fprintf(f, " appendfile");
971 #ifdef SUPPORT_MAILDIR
972 fprintf(f, "/maildir");
974 #ifdef SUPPORT_MAILSTORE
975 fprintf(f, "/mailstore");
981 #ifdef TRANSPORT_AUTOREPLY
982 fprintf(f, " autoreply");
984 #ifdef TRANSPORT_LMTP
987 #ifdef TRANSPORT_PIPE
990 #ifdef TRANSPORT_SMTP
995 if (fixed_never_users[0] > 0)
998 fprintf(f, "Fixed never_users: ");
999 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1000 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1001 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1008 /*************************************************
1009 * Quote a local part *
1010 *************************************************/
1012 /* This function is used when a sender address or a From: or Sender: header
1013 line is being created from the caller's login, or from an authenticated_id. It
1014 applies appropriate quoting rules for a local part.
1016 Argument: the local part
1017 Returns: the local part, quoted if necessary
1021 local_part_quote(uschar *lpart)
1023 BOOL needs_quote = FALSE;
1028 for (t = lpart; !needs_quote && *t != 0; t++)
1030 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1031 (*t != '.' || t == lpart || t[1] == 0);
1034 if (!needs_quote) return lpart;
1037 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1041 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1044 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1047 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1048 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1049 yield = string_cat(yield, &size, &ptr, nq, 1);
1053 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1061 /*************************************************
1062 * Load readline() functions *
1063 *************************************************/
1065 /* This function is called from testing executions that read data from stdin,
1066 but only when running as the calling user. Currently, only -be does this. The
1067 function loads the readline() function library and passes back the functions.
1068 On some systems, it needs the curses library, so load that too, but try without
1069 it if loading fails. All this functionality has to be requested at build time.
1072 fn_readline_ptr pointer to where to put the readline pointer
1073 fn_addhist_ptr pointer to where to put the addhistory function
1075 Returns: the dlopen handle or NULL on failure
1079 set_readline(char * (**fn_readline_ptr)(char *),
1080 char * (**fn_addhist_ptr)(char *))
1083 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1085 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1086 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1088 if (dlhandle != NULL)
1090 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1091 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1095 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1104 /*************************************************
1105 * Get a line from stdin for testing things *
1106 *************************************************/
1108 /* This function is called when running tests that can take a number of lines
1109 of input (for example, -be and -bt). It handles continuations and trailing
1110 spaces. And prompting and a blank line output on eof. If readline() is in use,
1111 the arguments are non-NULL and provide the relevant functions.
1114 fn_readline readline function or NULL
1115 fn_addhist addhist function or NULL
1117 Returns: pointer to dynamic memory, or NULL at end of file
1121 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1126 uschar *yield = NULL;
1128 if (fn_readline == NULL) printf("> ");
1132 uschar buffer[1024];
1136 char *readline_line = NULL;
1137 if (fn_readline != NULL)
1139 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1140 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1141 p = US readline_line;
1146 /* readline() not in use */
1149 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1153 /* Handle the line */
1155 ss = p + (int)Ustrlen(p);
1156 while (ss > p && isspace(ss[-1])) ss--;
1160 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1163 yield = string_cat(yield, &size, &ptr, p, ss - p);
1166 if (fn_readline != NULL) free(readline_line);
1169 if (ss == p || yield[ptr-1] != '\\')
1177 if (yield == NULL) printf("\n");
1183 /*************************************************
1184 * Entry point and high-level code *
1185 *************************************************/
1187 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1188 the appropriate action. All the necessary functions are present in the one
1189 binary. I originally thought one should split it up, but it turns out that so
1190 much of the apparatus is needed in each chunk that one might as well just have
1191 it all available all the time, which then makes the coding easier as well.
1194 argc count of entries in argv
1195 argv argument strings, with argv[0] being the program name
1197 Returns: EXIT_SUCCESS if terminated successfully
1198 EXIT_FAILURE otherwise, except when a message has been sent
1199 to the sender, and -oee was given
1203 main(int argc, char **cargv)
1205 uschar **argv = USS cargv;
1206 int arg_receive_timeout = -1;
1207 int arg_smtp_receive_timeout = -1;
1208 int arg_error_handling = error_handling;
1209 int filter_sfd = -1;
1210 int filter_ufd = -1;
1213 int list_queue_option = 0;
1215 int msg_action_arg = -1;
1216 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1217 int queue_only_reason = 0;
1219 int perl_start_option = 0;
1221 int recipients_arg = argc;
1222 int sender_address_domain = 0;
1223 int test_retry_arg = -1;
1224 int test_rewrite_arg = -1;
1225 BOOL arg_queue_only = FALSE;
1226 BOOL bi_option = FALSE;
1227 BOOL checking = FALSE;
1228 BOOL count_queue = FALSE;
1229 BOOL expansion_test = FALSE;
1230 BOOL extract_recipients = FALSE;
1231 BOOL forced_delivery = FALSE;
1232 BOOL f_end_dot = FALSE;
1233 BOOL deliver_give_up = FALSE;
1234 BOOL list_queue = FALSE;
1235 BOOL list_options = FALSE;
1236 BOOL local_queue_only;
1238 BOOL one_msg_action = FALSE;
1239 BOOL queue_only_set = FALSE;
1240 BOOL receiving_message = TRUE;
1242 BOOL removed_privilege = FALSE;
1243 BOOL verify_address_mode = FALSE;
1244 BOOL verify_as_sender = FALSE;
1245 BOOL version_printed = FALSE;
1246 uschar *alias_arg = NULL;
1247 uschar *called_as = US"";
1248 uschar *start_queue_run_id = NULL;
1249 uschar *stop_queue_run_id = NULL;
1250 uschar *ftest_domain = NULL;
1251 uschar *ftest_localpart = NULL;
1252 uschar *ftest_prefix = NULL;
1253 uschar *ftest_suffix = NULL;
1254 uschar *real_sender_address;
1255 uschar *originator_home = US"/";
1259 struct stat statbuf;
1260 pid_t passed_qr_pid = (pid_t)0;
1261 int passed_qr_pipe = -1;
1262 gid_t group_list[NGROUPS_MAX];
1264 /* Possible options for -R and -S */
1266 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1268 /* Need to define this in case we need to change the environment in order
1269 to get rid of a bogus time zone. We have to make it char rather than uschar
1270 because some OS define it in /usr/include/unistd.h. */
1272 extern char **environ;
1274 /* If the Exim user and/or group and/or the configuration file owner/group were
1275 defined by ref:name at build time, we must now find the actual uid/gid values.
1276 This is a feature to make the lives of binary distributors easier. */
1278 #ifdef EXIM_USERNAME
1279 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1281 exim_gid = pw->pw_gid;
1285 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1291 #ifdef EXIM_GROUPNAME
1292 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1294 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1300 #ifdef CONFIGURE_OWNERNAME
1301 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1303 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1304 CONFIGURE_OWNERNAME);
1309 #ifdef CONFIGURE_GROUPNAME
1310 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1312 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1313 CONFIGURE_GROUPNAME);
1318 /* In the Cygwin environment, some initialization needs doing. It is fudged
1319 in by means of this macro. */
1325 /* Check a field which is patched when we are running Exim within its
1326 testing harness; do a fast initial check, and then the whole thing. */
1328 running_in_test_harness =
1329 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1331 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1332 at the start of a program; however, it seems that some environments do not
1333 follow this. A "strange" locale can affect the formatting of timestamps, so we
1336 setlocale(LC_ALL, "C");
1338 /* Set up the default handler for timing using alarm(). */
1340 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1342 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1343 because store_malloc writes a log entry on failure. */
1345 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1346 if (log_buffer == NULL)
1348 fprintf(stderr, "exim: failed to get store for log buffer\n");
1352 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1353 NULL when the daemon is run and the file is closed. We have to use this
1354 indirection, because some systems don't allow writing to the variable "stderr".
1357 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1359 /* Arrange for the PCRE regex library to use our store functions. Note that
1360 the normal calls are actually macros that add additional arguments for
1361 debugging purposes so we have to assign specially constructed functions here.
1362 The default is to use store in the stacking pool, but this is overridden in the
1363 regex_must_compile() function. */
1365 pcre_malloc = function_store_get;
1366 pcre_free = function_dummy_free;
1368 /* Ensure there is a big buffer for temporary use in several places. It is put
1369 in malloc store so that it can be freed for enlargement if necessary. */
1371 big_buffer = store_malloc(big_buffer_size);
1373 /* Set up the handler for the data request signal, and set the initial
1374 descriptive text. */
1376 set_process_info("initializing");
1377 os_restarting_signal(SIGUSR1, usr1_handler);
1379 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1380 in the daemon code. For the rest of Exim's uses, we ignore it. */
1382 signal(SIGHUP, SIG_IGN);
1384 /* We don't want to die on pipe errors as the code is written to handle
1385 the write error instead. */
1387 signal(SIGPIPE, SIG_IGN);
1389 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1390 set to SIG_IGN. This causes subprocesses that complete before the parent
1391 process waits for them not to hang around, so when Exim calls wait(), nothing
1392 is there. The wait() code has been made robust against this, but let's ensure
1393 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1394 ending status. We use sigaction rather than plain signal() on those OS where
1395 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1396 problem on AIX with this.) */
1400 struct sigaction act;
1401 act.sa_handler = SIG_DFL;
1402 sigemptyset(&(act.sa_mask));
1404 sigaction(SIGCHLD, &act, NULL);
1407 signal(SIGCHLD, SIG_DFL);
1410 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1415 /* Set up the version number. Set up the leading 'E' for the external form of
1416 message ids, set the pointer to the internal form, and initialize it to
1417 indicate no message being processed. */
1420 message_id_option[0] = '-';
1421 message_id_external = message_id_option + 1;
1422 message_id_external[0] = 'E';
1423 message_id = message_id_external + 1;
1426 /* Set the umask to zero so that any files that Exim creates are created
1427 with the modes that it specifies. */
1431 /* Precompile the regular expression for matching a message id. Keep this in
1432 step with the code that generates ids in the accept.c module. We need to do
1433 this here, because the -M options check their arguments for syntactic validity
1434 using mac_ismsgid, which uses this. */
1437 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1439 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1440 this seems to be a generally accepted convention, since one finds symbolic
1441 links called "mailq" in standard OS configurations. */
1443 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1444 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1447 receiving_message = FALSE;
1448 called_as = US"-mailq";
1451 /* If the program is called as "rmail" treat it as equivalent to
1452 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1453 i.e. preventing a single dot on a line from terminating the message, and
1454 returning with zero return code, even in cases of error (provided an error
1455 message has been sent). */
1457 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1458 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1461 called_as = US"-rmail";
1462 errors_sender_rc = EXIT_SUCCESS;
1465 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1466 this is a smail convention. */
1468 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1469 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1471 smtp_input = smtp_batched_input = TRUE;
1472 called_as = US"-rsmtp";
1475 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1476 this is a smail convention. */
1478 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1479 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1482 receiving_message = FALSE;
1483 called_as = US"-runq";
1486 /* If the program is called as "newaliases" treat it as equivalent to
1487 "exim -bi"; this is a sendmail convention. */
1489 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1490 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1493 receiving_message = FALSE;
1494 called_as = US"-newaliases";
1497 /* Save the original effective uid for a couple of uses later. It should
1498 normally be root, but in some esoteric environments it may not be. */
1500 original_euid = geteuid();
1502 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1503 to be the same as the real ones. This makes a difference only if Exim is setuid
1504 (or setgid) to something other than root, which could be the case in some
1505 special configurations. */
1507 real_uid = getuid();
1508 real_gid = getgid();
1510 if (real_uid == root_uid)
1516 /* If neither the original real uid nor the original euid was root, Exim is
1517 running in an unprivileged state. */
1519 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1521 /* If the first argument is --help, pretend there are no arguments. This will
1522 cause a brief message to be given. */
1524 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1526 /* Scan the program's arguments. Some can be dealt with right away; others are
1527 simply recorded for checking and handling afterwards. Do a high-level switch
1528 on the second character (the one after '-'), to save some effort. */
1530 for (i = 1; i < argc; i++)
1532 BOOL badarg = FALSE;
1533 uschar *arg = argv[i];
1537 /* An argument not starting with '-' is the start of a recipients list;
1538 break out of the options-scanning loop. */
1546 /* An option consistion of -- terminates the options */
1548 if (Ustrcmp(arg, "--") == 0)
1550 recipients_arg = i + 1;
1554 /* Handle flagged options */
1556 switchchar = arg[1];
1559 /* Make all -ex options synonymous with -oex arguments, since that
1560 is assumed by various callers. Also make -qR options synonymous with -R
1561 options, as that seems to be required as well. Allow for -qqR too, and
1562 the same for -S options. */
1564 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1565 Ustrncmp(arg+1, "qR", 2) == 0 ||
1566 Ustrncmp(arg+1, "qS", 2) == 0)
1568 switchchar = arg[2];
1571 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1573 switchchar = arg[3];
1575 queue_2stage = TRUE;
1578 /* Make -r synonymous with -f, since it is a documented alias */
1580 else if (arg[1] == 'r') switchchar = 'f';
1582 /* Make -ov synonymous with -v */
1584 else if (Ustrcmp(arg, "-ov") == 0)
1590 /* High-level switch on active initial letter */
1594 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1595 so has no need of it. */
1598 if (*argrest == 0) i++; /* Skip over the type */
1603 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1605 /* -bd: Run in daemon mode, awaiting SMTP connections.
1606 -bdf: Ditto, but in the foreground.
1609 if (*argrest == 'd')
1611 daemon_listen = TRUE;
1612 if (*(++argrest) == 'f') background_daemon = FALSE;
1613 else if (*argrest != 0) { badarg = TRUE; break; }
1616 /* -be: Run in expansion test mode */
1618 else if (*argrest == 'e')
1619 expansion_test = checking = TRUE;
1621 /* -bF: Run system filter test */
1623 else if (*argrest == 'F')
1625 filter_test |= FTEST_SYSTEM;
1626 if (*(++argrest) != 0) { badarg = TRUE; break; }
1627 if (++i < argc) filter_test_sfile = argv[i]; else
1629 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1634 /* -bf: Run user filter test
1635 -bfd: Set domain for filter testing
1636 -bfl: Set local part for filter testing
1637 -bfp: Set prefix for filter testing
1638 -bfs: Set suffix for filter testing
1641 else if (*argrest == 'f')
1643 if (*(++argrest) == 0)
1645 filter_test |= FTEST_USER;
1646 if (++i < argc) filter_test_ufile = argv[i]; else
1648 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1656 fprintf(stderr, "exim: string expected after %s\n", arg);
1659 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1660 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1661 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1662 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1663 else { badarg = TRUE; break; }
1667 /* -bh: Host checking - an IP address must follow. */
1669 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1671 if (++i >= argc) { badarg = TRUE; break; }
1672 sender_host_address = argv[i];
1673 host_checking = checking = log_testing_mode = TRUE;
1674 host_checking_callout = argrest[1] == 'c';
1677 /* -bi: This option is used by sendmail to initialize *the* alias file,
1678 though it has the -oA option to specify a different file. Exim has no
1679 concept of *the* alias file, but since Sun's YP make script calls
1680 sendmail this way, some support must be provided. */
1682 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1684 /* -bm: Accept and deliver message - the default option. Reinstate
1685 receiving_message, which got turned off for all -b options. */
1687 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1689 /* -bnq: For locally originating messages, do not qualify unqualified
1690 addresses. In the envelope, this causes errors; in header lines they
1693 else if (Ustrcmp(argrest, "nq") == 0)
1695 allow_unqualified_sender = FALSE;
1696 allow_unqualified_recipient = FALSE;
1699 /* -bpxx: List the contents of the mail queue, in various forms. If
1700 the option is -bpc, just a queue count is needed. Otherwise, if the
1701 first letter after p is r, then order is random. */
1703 else if (*argrest == 'p')
1705 if (*(++argrest) == 'c')
1708 if (*(++argrest) != 0) badarg = TRUE;
1712 if (*argrest == 'r')
1714 list_queue_option = 8;
1717 else list_queue_option = 0;
1721 /* -bp: List the contents of the mail queue, top-level only */
1723 if (*argrest == 0) {}
1725 /* -bpu: List the contents of the mail queue, top-level undelivered */
1727 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1729 /* -bpa: List the contents of the mail queue, including all delivered */
1731 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1733 /* Unknown after -bp[r] */
1743 /* -bP: List the configuration variables given as the address list.
1744 Force -v, so configuration errors get displayed. */
1746 else if (Ustrcmp(argrest, "P") == 0)
1748 list_options = TRUE;
1749 debug_selector |= D_v;
1750 debug_file = stderr;
1753 /* -brt: Test retry configuration lookup */
1755 else if (Ustrcmp(argrest, "rt") == 0)
1757 test_retry_arg = i + 1;
1761 /* -brw: Test rewrite configuration */
1763 else if (Ustrcmp(argrest, "rw") == 0)
1765 test_rewrite_arg = i + 1;
1769 /* -bS: Read SMTP commands on standard input, but produce no replies -
1770 all errors are reported by sending messages. */
1772 else if (Ustrcmp(argrest, "S") == 0)
1773 smtp_input = smtp_batched_input = receiving_message = TRUE;
1775 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1776 on standard output. */
1778 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1780 /* -bt: address testing mode */
1782 else if (Ustrcmp(argrest, "t") == 0)
1783 address_test_mode = checking = log_testing_mode = TRUE;
1785 /* -bv: verify addresses */
1787 else if (Ustrcmp(argrest, "v") == 0)
1788 verify_address_mode = checking = log_testing_mode = TRUE;
1790 /* -bvs: verify sender addresses */
1792 else if (Ustrcmp(argrest, "vs") == 0)
1794 verify_address_mode = checking = log_testing_mode = TRUE;
1795 verify_as_sender = TRUE;
1798 /* -bV: Print version string and support details */
1800 else if (Ustrcmp(argrest, "V") == 0)
1802 printf("Exim version %s #%s built %s\n", version_string,
1803 version_cnumber, version_date);
1804 printf("%s\n", CS version_copyright);
1805 version_printed = TRUE;
1806 show_whats_supported(stdout);
1813 /* -C: change configuration file list; ignore if it isn't really
1814 a change! Enforce a prefix check if required. */
1819 if(++i < argc) argrest = argv[i]; else
1820 { badarg = TRUE; break; }
1822 if (Ustrcmp(config_main_filelist, argrest) != 0)
1824 #ifdef ALT_CONFIG_PREFIX
1826 int len = Ustrlen(ALT_CONFIG_PREFIX);
1827 uschar *list = argrest;
1829 while((filename = string_nextinlist(&list, &sep, big_buffer,
1830 big_buffer_size)) != NULL)
1832 if ((Ustrlen(filename) < len ||
1833 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1834 Ustrstr(filename, "/../") != NULL) &&
1835 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1837 fprintf(stderr, "-C Permission denied\n");
1843 config_main_filelist = argrest;
1844 config_changed = TRUE;
1849 /* -D: set up a macro definition */
1852 #ifdef DISABLE_D_OPTION
1853 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1858 macro_item *mlast = NULL;
1861 uschar *s = argrest;
1863 while (isspace(*s)) s++;
1865 if (*s < 'A' || *s > 'Z')
1867 fprintf(stderr, "exim: macro name set by -D must start with "
1868 "an upper case letter\n");
1872 while (isalnum(*s) || *s == '_')
1874 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1878 if (ptr == 0) { badarg = TRUE; break; }
1879 while (isspace(*s)) s++;
1882 if (*s++ != '=') { badarg = TRUE; break; }
1883 while (isspace(*s)) s++;
1886 for (m = macros; m != NULL; m = m->next)
1888 if (Ustrcmp(m->name, name) == 0)
1890 fprintf(stderr, "exim: duplicated -D in command line\n");
1896 m = store_get(sizeof(macro_item) + Ustrlen(name));
1898 m->command_line = TRUE;
1899 if (mlast == NULL) macros = m; else mlast->next = m;
1900 Ustrcpy(m->name, name);
1901 m->replacement = string_copy(s);
1903 if (clmacro_count >= MAX_CLMACROS)
1905 fprintf(stderr, "exim: too many -D options on command line\n");
1908 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1914 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1915 The latter is now a no-op, retained for compatibility only. If -dd is used,
1916 debugging subprocesses of the daemon is disabled. */
1919 if (Ustrcmp(argrest, "ropcr") == 0)
1921 /* drop_cr = TRUE; */
1924 /* Use an intermediate variable so that we don't set debugging while
1925 decoding the debugging bits. */
1929 unsigned int selector = D_default;
1932 if (*argrest == 'd')
1934 debug_daemon = TRUE;
1938 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1939 debug_options_count, US"debug");
1940 debug_selector = selector;
1945 /* -E: This is a local error message. This option is not intended for
1946 external use at all, but is not restricted to trusted callers because it
1947 does no harm (just suppresses certain error messages) and if Exim is run
1948 not setuid root it won't always be trusted when it generates error
1949 messages using this option. If there is a message id following -E, point
1950 message_reference at it, for logging. */
1953 local_error_message = TRUE;
1954 if (mac_ismsgid(argrest)) message_reference = argrest;
1958 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1959 option, so it looks as if historically the -oex options are also callable
1960 without the leading -o. So we have to accept them. Before the switch,
1961 anything starting -oe has been converted to -e. Exim does not support all
1962 of the sendmail error options. */
1965 if (Ustrcmp(argrest, "e") == 0)
1967 arg_error_handling = ERRORS_SENDER;
1968 errors_sender_rc = EXIT_SUCCESS;
1970 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1971 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1972 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1973 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1978 /* -F: Set sender's full name, used instead of the gecos entry from
1979 the password file. Since users can usually alter their gecos entries,
1980 there's no security involved in using this instead. The data can follow
1981 the -F or be in the next argument. */
1986 if(++i < argc) argrest = argv[i]; else
1987 { badarg = TRUE; break; }
1989 originator_name = argrest;
1993 /* -f: Set sender's address - this value is only actually used if Exim is
1994 run by a trusted user, or if untrusted_set_sender is set and matches the
1995 address, except that the null address can always be set by any user. The
1996 test for this happens later, when the value given here is ignored when not
1997 permitted. For an untrusted user, the actual sender is still put in Sender:
1998 if it doesn't match the From: header (unless no_local_from_check is set).
1999 The data can follow the -f or be in the next argument. The -r switch is an
2000 obsolete form of -f but since there appear to be programs out there that
2001 use anything that sendmail has ever supported, better accept it - the
2002 synonymizing is done before the switch above.
2004 At this stage, we must allow domain literal addresses, because we don't
2005 know what the setting of allow_domain_literals is yet. Ditto for trailing
2006 dots and strip_trailing_dot. */
2014 if (i+1 < argc) argrest = argv[++i]; else
2015 { badarg = TRUE; break; }
2019 sender_address = string_sprintf(""); /* Ensure writeable memory */
2023 uschar *temp = argrest + Ustrlen(argrest) - 1;
2024 while (temp >= argrest && isspace(*temp)) temp--;
2025 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2026 allow_domain_literals = TRUE;
2027 strip_trailing_dot = TRUE;
2028 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2029 &sender_address_domain, TRUE);
2030 allow_domain_literals = FALSE;
2031 strip_trailing_dot = FALSE;
2032 if (sender_address == NULL)
2034 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2035 return EXIT_FAILURE;
2038 sender_address_forced = TRUE;
2042 /* This is some Sendmail thing which can be ignored */
2047 /* -h: Set the hop count for an incoming message. Exim does not currently
2048 support this; it always computes it by counting the Received: headers.
2049 To put it in will require a change to the spool header file format. */
2054 if(++i < argc) argrest = argv[i]; else
2055 { badarg = TRUE; break; }
2057 if (!isdigit(*argrest)) badarg = TRUE;
2061 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2062 not to be documented for sendmail but mailx (at least) uses it) */
2065 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2070 receiving_message = FALSE;
2072 /* -MC: continue delivery of another message via an existing open
2073 file descriptor. This option is used for an internal call by the
2074 smtp transport when there is a pending message waiting to go to an
2075 address to which it has got a connection. Five subsequent arguments are
2076 required: transport name, host name, IP address, sequence number, and
2077 message_id. Transports may decline to create new processes if the sequence
2078 number gets too big. The channel is stdin. This (-MC) must be the last
2079 argument. There's a subsequent check that the real-uid is privileged.
2081 If we are running in the test harness. delay for a bit, to let the process
2082 that set this one up complete. This makes for repeatability of the logging,
2085 if (Ustrcmp(argrest, "C") == 0)
2089 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2090 return EXIT_FAILURE;
2093 if (msg_action_arg >= 0)
2095 fprintf(stderr, "exim: incompatible arguments\n");
2096 return EXIT_FAILURE;
2099 continue_transport = argv[++i];
2100 continue_hostname = argv[++i];
2101 continue_host_address = argv[++i];
2102 continue_sequence = Uatoi(argv[++i]);
2103 msg_action = MSG_DELIVER;
2104 msg_action_arg = ++i;
2105 forced_delivery = TRUE;
2106 queue_run_pid = passed_qr_pid;
2107 queue_run_pipe = passed_qr_pipe;
2109 if (!mac_ismsgid(argv[i]))
2111 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2113 return EXIT_FAILURE;
2116 if (running_in_test_harness) millisleep(500);
2120 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2121 precedes -MC (see above). The flag indicates that the host to which
2122 Exim is connected has accepted an AUTH sequence. */
2124 else if (Ustrcmp(argrest, "CA") == 0)
2126 smtp_authenticated = TRUE;
2130 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2131 it preceded -MC (see above) */
2133 else if (Ustrcmp(argrest, "CP") == 0)
2135 smtp_use_pipelining = TRUE;
2139 /* -MCQ: pass on the pid of the queue-running process that started
2140 this chain of deliveries and the fd of its synchronizing pipe; this
2141 is useful only when it precedes -MC (see above) */
2143 else if (Ustrcmp(argrest, "CQ") == 0)
2145 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2147 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2152 /* -MCS: set the smtp_use_size flag; this is useful only when it
2153 precedes -MC (see above) */
2155 else if (Ustrcmp(argrest, "CS") == 0)
2157 smtp_use_size = TRUE;
2161 /* -MCT: set the tls_offered flag; this is useful only when it
2162 precedes -MC (see above). The flag indicates that the host to which
2163 Exim is connected has offered TLS support. */
2166 else if (Ustrcmp(argrest, "CT") == 0)
2173 /* -M[x]: various operations on the following list of message ids:
2174 -M deliver the messages, ignoring next retry times and thawing
2175 -Mc deliver the messages, checking next retry times, no thawing
2176 -Mf freeze the messages
2177 -Mg give up on the messages
2178 -Mt thaw the messages
2179 -Mrm remove the messages
2180 In the above cases, this must be the last option. There are also the
2181 following options which are followed by a single message id, and which
2182 act on that message. Some of them use the "recipient" addresses as well.
2183 -Mar add recipient(s)
2184 -Mmad mark all recipients delivered
2185 -Mmd mark recipients(s) delivered
2192 else if (*argrest == 0)
2194 msg_action = MSG_DELIVER;
2195 forced_delivery = deliver_force_thaw = TRUE;
2197 else if (Ustrcmp(argrest, "ar") == 0)
2199 msg_action = MSG_ADD_RECIPIENT;
2200 one_msg_action = TRUE;
2202 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2203 else if (Ustrcmp(argrest, "es") == 0)
2205 msg_action = MSG_EDIT_SENDER;
2206 one_msg_action = TRUE;
2208 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2209 else if (Ustrcmp(argrest, "g") == 0)
2211 msg_action = MSG_DELIVER;
2212 deliver_give_up = TRUE;
2214 else if (Ustrcmp(argrest, "mad") == 0)
2216 msg_action = MSG_MARK_ALL_DELIVERED;
2218 else if (Ustrcmp(argrest, "md") == 0)
2220 msg_action = MSG_MARK_DELIVERED;
2221 one_msg_action = TRUE;
2223 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2224 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2225 else if (Ustrcmp(argrest, "vb") == 0)
2227 msg_action = MSG_SHOW_BODY;
2228 one_msg_action = TRUE;
2230 else if (Ustrcmp(argrest, "vh") == 0)
2232 msg_action = MSG_SHOW_HEADER;
2233 one_msg_action = TRUE;
2235 else if (Ustrcmp(argrest, "vl") == 0)
2237 msg_action = MSG_SHOW_LOG;
2238 one_msg_action = TRUE;
2240 else { badarg = TRUE; break; }
2242 /* All the -Mxx options require at least one message id. */
2244 msg_action_arg = i + 1;
2245 if (msg_action_arg >= argc)
2247 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2248 return EXIT_FAILURE;
2251 /* Some require only message ids to follow */
2253 if (!one_msg_action)
2256 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2258 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2260 return EXIT_FAILURE;
2262 goto END_ARG; /* Remaining args are ids */
2265 /* Others require only one message id, possibly followed by addresses,
2266 which will be handled as normal arguments. */
2270 if (!mac_ismsgid(argv[msg_action_arg]))
2272 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2273 argv[msg_action_arg], arg);
2274 return EXIT_FAILURE;
2281 /* Some programs seem to call the -om option without the leading o;
2282 for sendmail it askes for "me too". Exim always does this. */
2285 if (*argrest != 0) badarg = TRUE;
2289 /* -N: don't do delivery - a debugging option that stops transports doing
2290 their thing. It implies debugging at the D_v level. */
2295 dont_deliver = TRUE;
2296 debug_selector |= D_v;
2297 debug_file = stderr;
2303 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2309 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2310 option to the specified value. This form uses long names. We need to handle
2311 -O option=value and -Ooption=value. */
2318 fprintf(stderr, "exim: string expected after -O\n");
2326 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2329 if (*argrest == 'A')
2331 alias_arg = argrest + 1;
2332 if (alias_arg[0] == 0)
2334 if (i+1 < argc) alias_arg = argv[++i]; else
2336 fprintf(stderr, "exim: string expected after -oA\n");
2342 /* -oB: Set a connection message max value for remote deliveries */
2344 else if (*argrest == 'B')
2346 uschar *p = argrest + 1;
2349 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2351 connection_max_messages = 1;
2360 fprintf(stderr, "exim: number expected after -oB\n");
2363 connection_max_messages = Uatoi(p);
2367 /* -odb: background delivery */
2369 else if (Ustrcmp(argrest, "db") == 0)
2371 synchronous_delivery = FALSE;
2372 arg_queue_only = FALSE;
2373 queue_only_set = TRUE;
2376 /* -odf: foreground delivery (smail-compatible option); same effect as
2377 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2380 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2382 synchronous_delivery = TRUE;
2383 arg_queue_only = FALSE;
2384 queue_only_set = TRUE;
2387 /* -odq: queue only */
2389 else if (Ustrcmp(argrest, "dq") == 0)
2391 synchronous_delivery = FALSE;
2392 arg_queue_only = TRUE;
2393 queue_only_set = TRUE;
2396 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2397 but no remote delivery */
2399 else if (Ustrcmp(argrest, "dqs") == 0)
2402 arg_queue_only = FALSE;
2403 queue_only_set = TRUE;
2406 /* -oex: Sendmail error flags. As these are also accepted without the
2407 leading -o prefix, for compatibility with vacation and other callers,
2408 they are handled with -e above. */
2410 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2411 -oitrue: Another sendmail syntax for the same */
2413 else if (Ustrcmp(argrest, "i") == 0 ||
2414 Ustrcmp(argrest, "itrue") == 0)
2417 /* -oM*: Set various characteristics for an incoming message; actually
2418 acted on for trusted callers only. */
2420 else if (*argrest == 'M')
2424 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2428 /* -oMa: Set sender host address */
2430 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2432 /* -oMaa: Set authenticator name */
2434 else if (Ustrcmp(argrest, "Maa") == 0)
2435 sender_host_authenticated = argv[++i];
2437 /* -oMas: setting authenticated sender */
2439 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2441 /* -oMai: setting authenticated id */
2443 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2445 /* -oMi: Set incoming interface address */
2447 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2449 /* -oMr: Received protocol */
2451 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2453 /* -oMs: Set sender host name */
2455 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2457 /* -oMt: Set sender ident */
2459 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2461 /* Else a bad argument */
2470 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2471 seem to call this as -m (undocumented), so that is also accepted (see
2474 else if (Ustrcmp(argrest, "m") == 0) {}
2476 /* -oo: An ancient flag for old-style addresses which still seems to
2477 crop up in some calls (see in SCO). */
2479 else if (Ustrcmp(argrest, "o") == 0) {}
2481 /* -oP <name>: set pid file path for daemon */
2483 else if (Ustrcmp(argrest, "P") == 0)
2484 override_pid_file_path = argv[++i];
2486 /* -or <n>: set timeout for non-SMTP acceptance
2487 -os <n>: set timeout for SMTP acceptance */
2489 else if (*argrest == 'r' || *argrest == 's')
2491 int *tp = (*argrest == 'r')?
2492 &arg_receive_timeout : &arg_smtp_receive_timeout;
2493 if (argrest[1] == 0)
2495 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2497 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2500 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2505 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2507 else if (Ustrcmp(argrest, "X") == 0)
2508 override_local_interfaces = argv[++i];
2510 /* Unknown -o argument */
2516 /* -ps: force Perl startup; -pd force delayed Perl startup */
2520 if (*argrest == 's' && argrest[1] == 0)
2522 perl_start_option = 1;
2525 if (*argrest == 'd' && argrest[1] == 0)
2527 perl_start_option = -1;
2532 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2533 which sets the host protocol and host name */
2537 if (i+1 < argc) argrest = argv[++i]; else
2538 { badarg = TRUE; break; }
2543 uschar *hn = Ustrchr(argrest, ':');
2546 received_protocol = argrest;
2550 received_protocol = string_copyn(argrest, hn - argrest);
2551 sender_host_name = hn + 1;
2558 receiving_message = FALSE;
2560 /* -qq...: Do queue runs in a 2-stage manner */
2562 if (*argrest == 'q')
2564 queue_2stage = TRUE;
2568 /* -qi...: Do only first (initial) deliveries */
2570 if (*argrest == 'i')
2572 queue_run_first_delivery = TRUE;
2576 /* -qf...: Run the queue, forcing deliveries
2577 -qff..: Ditto, forcing thawing as well */
2579 if (*argrest == 'f')
2581 queue_run_force = TRUE;
2582 if (*(++argrest) == 'f')
2584 deliver_force_thaw = TRUE;
2589 /* -q[f][f]l...: Run the queue only on local deliveries */
2591 if (*argrest == 'l')
2593 queue_run_local = TRUE;
2597 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2598 optionally starting from a given message id. */
2600 if (*argrest == 0 &&
2601 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2604 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2605 start_queue_run_id = argv[++i];
2606 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2607 stop_queue_run_id = argv[++i];
2610 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2611 optionally local only. */
2616 queue_interval = readconf_readtime(argrest, 0, FALSE);
2618 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2619 if (queue_interval <= 0)
2621 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2628 case 'R': /* Synonymous with -qR... */
2629 receiving_message = FALSE;
2631 /* -Rf: As -R (below) but force all deliveries,
2632 -Rff: Ditto, but also thaw all frozen messages,
2633 -Rr: String is regex
2634 -Rrf: Regex and force
2635 -Rrff: Regex and force and thaw
2637 in all cases provided there are no further characters in this
2643 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2645 if (Ustrcmp(argrest, rsopts[i]) == 0)
2647 if (i != 2) queue_run_force = TRUE;
2648 if (i >= 2) deliver_selectstring_regex = TRUE;
2649 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2650 argrest += Ustrlen(rsopts[i]);
2655 /* -R: Set string to match in addresses for forced queue run to
2656 pick out particular messages. */
2660 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2662 fprintf(stderr, "exim: string expected after -R\n");
2666 else deliver_selectstring = argrest;
2667 if (queue_interval < 0) queue_interval = 0;
2671 /* -r: an obsolete synonym for -f (see above) */
2674 /* -S: Like -R but works on sender. */
2676 case 'S': /* Synonymous with -qS... */
2677 receiving_message = FALSE;
2679 /* -Sf: As -S (below) but force all deliveries,
2680 -Sff: Ditto, but also thaw all frozen messages,
2681 -Sr: String is regex
2682 -Srf: Regex and force
2683 -Srff: Regex and force and thaw
2685 in all cases provided there are no further characters in this
2691 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2693 if (Ustrcmp(argrest, rsopts[i]) == 0)
2695 if (i != 2) queue_run_force = TRUE;
2696 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2697 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2698 argrest += Ustrlen(rsopts[i]);
2703 /* -S: Set string to match in addresses for forced queue run to
2704 pick out particular messages. */
2708 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2710 fprintf(stderr, "exim: string expected after -S\n");
2714 else deliver_selectstring_sender = argrest;
2715 if (queue_interval < 0) queue_interval = 0;
2718 /* -Tqt is an option that is exclusively for use by the testing suite.
2719 It is not recognized in other circumstances. It allows for the setting up
2720 of explicit "queue times" so that various warning/retry things can be
2721 tested. Otherwise variability of clock ticks etc. cause problems. */
2724 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2725 fudged_queue_times = argv[++i];
2730 /* -t: Set flag to extract recipients from body of message. */
2733 if (*argrest == 0) extract_recipients = TRUE;
2735 /* -ti: Set flag to extract recipients from body of message, and also
2736 specify that dot does not end the message. */
2738 else if (Ustrcmp(argrest, "i") == 0)
2740 extract_recipients = TRUE;
2744 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2747 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2754 /* -U: This means "initial user submission" in sendmail, apparently. The
2755 doc claims that in future sendmail may refuse syntactically invalid
2756 messages instead of fixing them. For the moment, we just ignore it. */
2762 /* -v: verify things - this is a very low-level debugging */
2767 debug_selector |= D_v;
2768 debug_file = stderr;
2774 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2776 The -x flag tells the sendmail command that mail from a local
2777 mail program has National Language Support (NLS) extended characters
2778 in the body of the mail item. The sendmail command can send mail with
2779 extended NLS characters across networks that normally corrupts these
2782 As Exim is 8-bit clean, it just ignores this flag. */
2785 if (*argrest != 0) badarg = TRUE;
2788 /* All other initial characters are errors */
2793 } /* End of high-level switch statement */
2795 /* Failed to recognize the option, or syntax error */
2799 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2800 "option %s\n", arg);
2806 /* Arguments have been processed. Check for incompatibilities. */
2810 (smtp_input || extract_recipients || recipients_arg < argc) &&
2811 (daemon_listen || queue_interval >= 0 || bi_option ||
2812 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2813 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2816 msg_action_arg > 0 &&
2817 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2818 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2821 (daemon_listen || queue_interval >= 0) &&
2822 (sender_address != NULL || list_options || list_queue || checking ||
2826 daemon_listen && queue_interval == 0
2830 (checking || smtp_input || extract_recipients ||
2831 filter_test != FTEST_NONE || bi_option)
2834 verify_address_mode &&
2835 (address_test_mode || smtp_input || extract_recipients ||
2836 filter_test != FTEST_NONE || bi_option)
2839 address_test_mode && (smtp_input || extract_recipients ||
2840 filter_test != FTEST_NONE || bi_option)
2843 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2847 deliver_selectstring != NULL && queue_interval < 0
2851 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2855 /* If debugging is set up, set the file and the file descriptor to pass on to
2856 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2857 to run in the foreground. */
2859 if (debug_selector != 0)
2861 debug_file = stderr;
2862 debug_fd = fileno(debug_file);
2863 background_daemon = FALSE;
2864 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2865 if (debug_selector != D_v) /* -v only doesn't show this */
2867 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2868 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2870 show_whats_supported(stderr);
2874 /* When started with root privilege, ensure that the limits on the number of
2875 open files and the number of processes (where that is accessible) are
2876 sufficiently large, or are unset, in case Exim has been called from an
2877 environment where the limits are screwed down. Not all OS have the ability to
2878 change some of these limits. */
2882 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2888 #ifdef RLIMIT_NOFILE
2889 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2891 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2893 rlp.rlim_cur = rlp.rlim_max = 0;
2896 /* I originally chose 1000 as a nice big number that was unlikely to
2897 be exceeded. It turns out that some older OS have a fixed upper limit of
2900 if (rlp.rlim_cur < 1000)
2902 rlp.rlim_cur = rlp.rlim_max = 1000;
2903 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2905 rlp.rlim_cur = rlp.rlim_max = 256;
2906 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2907 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2914 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2916 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2918 rlp.rlim_cur = rlp.rlim_max = 0;
2921 #ifdef RLIM_INFINITY
2922 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2924 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2926 if (rlp.rlim_cur < 1000)
2928 rlp.rlim_cur = rlp.rlim_max = 1000;
2930 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2931 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2937 /* Exim is normally entered as root (but some special configurations are
2938 possible that don't do this). However, it always spins off sub-processes that
2939 set their uid and gid as required for local delivery. We don't want to pass on
2940 any extra groups that root may belong to, so we want to get rid of them all at
2943 We need to obey setgroups() at this stage, before possibly giving up root
2944 privilege for a changed configuration file, but later on we might need to
2945 check on the additional groups for the admin user privilege - can't do that
2946 till after reading the config, which might specify the exim gid. Therefore,
2947 save the group list here first. */
2949 group_count = getgroups(NGROUPS_MAX, group_list);
2951 /* There is a fundamental difference in some BSD systems in the matter of
2952 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2953 known not to be different. On the "different" systems there is a single group
2954 list, and the first entry in it is the current group. On all other versions of
2955 Unix there is a supplementary group list, which is in *addition* to the current
2956 group. Consequently, to get rid of all extraneous groups on a "standard" system
2957 you pass over 0 groups to setgroups(), while on a "different" system you pass
2958 over a single group - the current group, which is always the first group in the
2959 list. Calling setgroups() with zero groups on a "different" system results in
2960 an error return. The following code should cope with both types of system.
2962 However, if this process isn't running as root, setgroups() can't be used
2963 since you have to be root to run it, even if throwing away groups. Not being
2964 root here happens only in some unusual configurations. We just ignore the
2967 if (setgroups(0, NULL) != 0)
2969 if (setgroups(1, group_list) != 0 && !unprivileged)
2971 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2976 /* If the configuration file name has been altered by an argument on the
2977 command line (either a new file name or a macro definition) and the caller is
2978 not root or the exim user, or if this is a filter testing run, remove any
2979 setuid privilege the program has, and run as the underlying user.
2981 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2982 severely restricts the use of -C for some purposes.
2984 Otherwise, set the real ids to the effective values (should be root unless run
2985 from inetd, which it can either be root or the exim uid, if one is configured).
2987 There is a private mechanism for bypassing some of this, in order to make it
2988 possible to test lots of configurations automatically, without having either to
2989 recompile each time, or to patch in an actual configuration file name and other
2990 values (such as the path name). If running in the test harness, pretend that
2991 configuration file changes and macro definitions haven't happened. */
2994 (config_changed || macros != NULL) && /* Config changed, and */
2995 real_uid != root_uid && /* Not root, and */
2996 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
2997 real_uid != exim_uid && /* Not exim, and */
2999 !running_in_test_harness /* Not fudged */
3001 expansion_test /* expansion testing */
3003 filter_test != FTEST_NONE) /* Filter testing */
3005 setgroups(group_count, group_list);
3006 exim_setugid(real_uid, real_gid, FALSE,
3007 US"-C, -D, -be or -bf forces real uid");
3008 removed_privilege = TRUE;
3010 /* In the normal case when Exim is called like this, stderr is available
3011 and should be used for any logging information because attempts to write
3012 to the log will usually fail. To arrange this, we unset really_exim. However,
3013 if no stderr is available there is no point - we might as well have a go
3014 at the log (if it fails, syslog will be written). */
3016 if (log_stderr != NULL) really_exim = FALSE;
3019 /* Privilege is to be retained for the moment. It may be dropped later,
3020 depending on the job that this Exim process has been asked to do. For now, set
3021 the real uid to the effective so that subsequent re-execs of Exim are done by a
3024 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3026 /* If testing a filter, open the file(s) now, before wasting time doing other
3027 setups and reading the message. */
3029 if ((filter_test & FTEST_SYSTEM) != 0)
3031 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3034 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3036 return EXIT_FAILURE;
3040 if ((filter_test & FTEST_USER) != 0)
3042 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3045 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3047 return EXIT_FAILURE;
3051 /* Read the main runtime configuration data; this gives up if there
3052 is a failure. It leaves the configuration file open so that the subsequent
3053 configuration data for delivery can be read if needed. */
3057 /* Handle the decoding of logging options. */
3059 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3060 log_options, log_options_count, US"log");
3064 debug_printf("configuration file is %s\n", config_main_filename);
3065 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3066 log_extra_selector);
3069 /* If domain literals are not allowed, check the sender address that was
3070 supplied with -f. Ditto for a stripped trailing dot. */
3072 if (sender_address != NULL)
3074 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3076 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3077 "allowed\n", sender_address);
3078 return EXIT_FAILURE;
3080 if (f_end_dot && !strip_trailing_dot)
3082 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3083 "(trailing dot not allowed)\n", sender_address);
3084 return EXIT_FAILURE;
3088 /* Paranoia check of maximum lengths of certain strings. There is a check
3089 on the length of the log file path in log.c, which will come into effect
3090 if there are any calls to write the log earlier than this. However, if we
3091 get this far but the string is very long, it is better to stop now than to
3092 carry on and (e.g.) receive a message and then have to collapse. The call to
3093 log_write() from here will cause the ultimate panic collapse if the complete
3094 file name exceeds the buffer length. */
3096 if (Ustrlen(log_file_path) > 200)
3097 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3098 "log_file_path is longer than 200 chars: aborting");
3100 if (Ustrlen(pid_file_path) > 200)
3101 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3102 "pid_file_path is longer than 200 chars: aborting");
3104 if (Ustrlen(spool_directory) > 200)
3105 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3106 "spool_directory is longer than 200 chars: aborting");
3108 /* Length check on the process name given to syslog for its TAG field,
3109 which is only permitted to be 32 characters or less. See RFC 3164. */
3111 if (Ustrlen(syslog_processname) > 32)
3112 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3113 "syslog_processname is longer than 32 chars: aborting");
3115 /* In some operating systems, the environment variable TMPDIR controls where
3116 temporary files are created; Exim doesn't use these (apart from when delivering
3117 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3118 If TMPDIR is found in the environment, reset it to the value defined in the
3119 TMPDIR macro, if this macro is defined. */
3124 for (p = USS environ; *p != NULL; p++)
3126 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3127 Ustrcmp(*p+7, TMPDIR) != 0)
3129 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3130 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3132 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3138 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3139 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3140 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3141 called by a user who has set the TZ variable. This then affects the timestamps
3142 in log files and in Received: headers, and any created Date: header lines. The
3143 required timezone is settable in the configuration file, so nothing can be done
3144 about this earlier - but hopefully nothing will normally be logged earlier than
3145 this. We have to make a new environment if TZ is wrong, but don't bother if
3146 timestamps_utc is set, because then all times are in UTC anyway. */
3148 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3150 timestamps_utc = TRUE;
3154 uschar *envtz = US getenv("TZ");
3155 if ((envtz == NULL && timezone_string != NULL) ||
3157 (timezone_string == NULL ||
3158 Ustrcmp(timezone_string, envtz) != 0)))
3160 uschar **p = USS environ;
3164 while (*p++ != NULL) count++;
3165 if (envtz == NULL) count++;
3166 newp = new = malloc(sizeof(uschar *) * (count + 1));
3167 for (p = USS environ; *p != NULL; p++)
3169 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3172 if (timezone_string != NULL)
3174 *newp = malloc(Ustrlen(timezone_string) + 4);
3175 sprintf(CS *newp++, "TZ=%s", timezone_string);
3180 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3181 tod_stamp(tod_log));
3185 /* Handle the case when we have removed the setuid privilege because of -C or
3186 -D. This means that the caller of Exim was not root, and, provided that
3187 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3190 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3191 were running as the exim user defined in the configuration file (different to
3192 the one in the binary). The sysadmin may expect this case to retain privilege
3193 because "the binary was called by the Exim user", but it hasn't, because of the
3194 order in which it handles this stuff. There are two possibilities:
3196 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3197 to do message deliveries. Thus, the fact that it is running as a
3198 non-privileged user is plausible, and might be wanted in some special
3199 configurations. However, really_exim will have been set false when
3200 privilege was dropped, to stop Exim trying to write to its normal log
3201 files. Therefore, re-enable normal log processing, assuming the sysadmin
3202 has set up the log directory correctly.
3204 (2) If deliver_drop_privilege is not set, the configuration won't work as
3205 apparently intended, and so we log a panic message. In order to retain
3206 root for -C or -D, the caller must either be root or the Exim user
3207 defined in the binary (when deliver_drop_ privilege is false).
3209 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3210 built-in exim user or one defined in the configuration. In either event,
3211 re-enable log processing, assuming the sysadmin knows what they are doing. */
3213 if (removed_privilege && (config_changed || macros != NULL) &&
3214 real_uid == exim_uid)
3216 #ifdef ALT_CONFIG_ROOT_ONLY
3217 really_exim = TRUE; /* let logging work normally */
3220 if (deliver_drop_privilege)
3221 really_exim = TRUE; /* let logging work normally */
3223 log_write(0, LOG_MAIN|LOG_PANIC,
3224 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3225 (int)exim_uid, config_changed? "-C" : "-D");
3229 /* Start up Perl interpreter if Perl support is configured and there is a
3230 perl_startup option, and the configuration or the command line specifies
3231 initializing starting. Note that the global variables are actually called
3232 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3235 if (perl_start_option != 0)
3236 opt_perl_at_start = (perl_start_option > 0);
3237 if (opt_perl_at_start && opt_perl_startup != NULL)
3240 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3241 errstr = init_perl(opt_perl_startup);
3244 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3245 return EXIT_FAILURE;
3247 opt_perl_started = TRUE;
3249 #endif /* EXIM_PERL */
3251 /* Log the arguments of the call if the configuration file said so. This is
3252 a debugging feature for finding out what arguments certain MUAs actually use.
3253 Don't attempt it if logging is disabled, or if listing variables or if
3254 verifying/testing addresses or expansions. */
3256 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3257 && really_exim && !list_options && !checking)
3260 uschar *p = big_buffer;
3262 (void)getcwd(CS p+4, big_buffer_size - 4);
3264 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3266 for (i = 0; i < argc; i++)
3268 int len = Ustrlen(argv[i]);
3271 if (p + len + 8 >= big_buffer + big_buffer_size)
3274 log_write(0, LOG_MAIN, "%s", big_buffer);
3275 Ustrcpy(big_buffer, "...");
3278 printing = string_printing(argv[i]);
3279 if (printing[0] == 0) quote = US"\""; else
3281 uschar *pp = printing;
3283 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3285 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3286 (p - big_buffer) - 4), printing, quote);
3290 if ((log_extra_selector & LX_arguments) != 0)
3291 log_write(0, LOG_MAIN, "%s", big_buffer);
3293 debug_printf("%s\n", big_buffer);
3296 /* Set the working directory to be the top-level spool directory. We don't rely
3297 on this in the code, which always uses fully qualified names, but it's useful
3298 for core dumps etc. Don't complain if it fails - the spool directory might not
3299 be generally accessible and calls with the -C option (and others) have lost
3300 privilege by now. */
3302 if (Uchdir(spool_directory) != 0)
3304 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3305 (void)Uchdir(spool_directory);
3308 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3309 alias file. Exim doesn't have such a concept, but this call is screwed into
3310 Sun's YP makefiles. Handle this by calling a configured script, as the real
3311 user who called Exim. The -oA option can be used to pass an argument to the
3316 (void)fclose(config_file);
3317 if (bi_command != NULL)
3321 argv[i++] = bi_command;
3322 if (alias_arg != NULL) argv[i++] = alias_arg;
3325 setgroups(group_count, group_list);
3326 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3328 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3329 (argv[1] == NULL)? US"" : argv[1]);
3331 execv(CS argv[0], (char *const *)argv);
3332 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3337 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3342 /* If an action on specific messages is requested, or if a daemon or queue
3343 runner is being started, we need to know if Exim was called by an admin user.
3344 This is the case if the real user is root or exim, or if the real group is
3345 exim, or if one of the supplementary groups is exim or a group listed in
3346 admin_groups. We don't fail all message actions immediately if not admin_user,
3347 since some actions can be performed by non-admin users. Instead, set admin_user
3348 for later interrogation. */
3350 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3356 for (i = 0; i < group_count; i++)
3358 if (group_list[i] == exim_gid) admin_user = TRUE;
3359 else if (admin_groups != NULL)
3361 for (j = 1; j <= (int)(admin_groups[0]); j++)
3362 if (admin_groups[j] == group_list[i])
3363 { admin_user = TRUE; break; }
3365 if (admin_user) break;
3369 /* Another group of privileged users are the trusted users. These are root,
3370 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3371 are permitted to specify sender_addresses with -f on the command line, and
3372 other message parameters as well. */
3374 if (real_uid == root_uid || real_uid == exim_uid)
3375 trusted_caller = TRUE;
3380 if (trusted_users != NULL)
3382 for (i = 1; i <= (int)(trusted_users[0]); i++)
3383 if (trusted_users[i] == real_uid)
3384 { trusted_caller = TRUE; break; }
3387 if (!trusted_caller && trusted_groups != NULL)
3389 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3391 if (trusted_groups[i] == real_gid)
3392 trusted_caller = TRUE;
3393 else for (j = 0; j < group_count; j++)
3395 if (trusted_groups[i] == group_list[j])
3396 { trusted_caller = TRUE; break; }
3398 if (trusted_caller) break;
3403 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3404 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3406 /* Only an admin user may start the daemon or force a queue run in the default
3407 configuration, but the queue run restriction can be relaxed. Only an admin
3408 user may request that a message be returned to its sender forthwith. Only an
3409 admin user may specify a debug level greater than D_v (because it might show
3410 passwords, etc. in lookup queries). Only an admin user may request a queue
3415 BOOL debugset = (debug_selector & ~D_v) != 0;
3416 if (deliver_give_up || daemon_listen ||
3417 (count_queue && queue_list_requires_admin) ||
3418 (list_queue && queue_list_requires_admin) ||
3419 (queue_interval >= 0 && prod_requires_admin) ||
3420 (debugset && !running_in_test_harness))
3422 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3427 /* If the real user is not root or the exim uid, the argument for passing
3428 in an open TCP/IP connection for another message is not permitted, nor is
3429 running with the -N option for any delivery action, unless this call to exim is
3430 one that supplied an input message, or we are using a patched exim for
3431 regression testing. */
3433 if (real_uid != root_uid && real_uid != exim_uid &&
3434 (continue_hostname != NULL ||
3436 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3437 )) && !running_in_test_harness)
3439 fprintf(stderr, "exim: Permission denied\n");
3440 return EXIT_FAILURE;
3443 /* If the caller is not trusted, certain arguments are ignored when running for
3444 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3445 Note that authority for performing certain actions on messages is tested in the
3446 queue_action() function. */
3448 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3450 sender_host_name = sender_host_address = interface_address =
3451 sender_ident = received_protocol = NULL;
3452 sender_host_port = interface_port = 0;
3453 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3456 /* If a sender host address is set, extract the optional port number off the
3457 end of it and check its syntax. Do the same thing for the interface address.
3458 Exim exits if the syntax is bad. */
3462 if (sender_host_address != NULL)
3463 sender_host_port = check_port(sender_host_address);
3464 if (interface_address != NULL)
3465 interface_port = check_port(interface_address);
3468 /* If an SMTP message is being received check to see if the standard input is a
3469 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3470 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3475 union sockaddr_46 inetd_sock;
3476 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3477 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3479 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3480 if (family == AF_INET || family == AF_INET6)
3482 union sockaddr_46 interface_sock;
3483 size = sizeof(interface_sock);
3485 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3486 interface_address = host_ntoa(-1, &interface_sock, NULL,
3489 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3491 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3494 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3495 NULL, &sender_host_port);
3496 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3497 "inetd is not supported when mua_wrapper is set");
3502 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3503 return EXIT_FAILURE;
3509 /* If the load average is going to be needed while receiving a message, get it
3510 now for those OS that require the first call to os_getloadavg() to be done as
3511 root. There will be further calls later for each message received. */
3513 #ifdef LOAD_AVG_NEEDS_ROOT
3514 if (receiving_message &&
3515 (queue_only_load >= 0 ||
3516 (is_inetd && smtp_load_reserve >= 0)
3519 load_average = os_getloadavg();
3523 /* The queue_only configuration option can be overridden by -odx on the command
3524 line, except that if queue_only_override is false, queue_only cannot be unset
3525 from the command line. */
3527 if (queue_only_set && (queue_only_override || arg_queue_only))
3528 queue_only = arg_queue_only;
3530 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3533 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3534 if (arg_smtp_receive_timeout >= 0)
3535 smtp_receive_timeout = arg_smtp_receive_timeout;
3537 /* If Exim was started with root privilege, unless we have already removed the
3538 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3539 except when starting the daemon or doing some kind of delivery or address
3540 testing (-bt). These are the only cases when root need to be retained. We run
3541 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3542 retained only for starting the daemon. */
3544 if (!unprivileged && /* originally had root AND */
3545 !removed_privilege && /* still got root AND */
3546 !daemon_listen && /* not starting the daemon */
3547 queue_interval <= 0 && /* (either kind of daemon) */
3549 deliver_drop_privilege || /* requested unprivileged */
3551 queue_interval < 0 && /* not running the queue */
3552 (msg_action_arg < 0 || /* and */
3553 msg_action != MSG_DELIVER) && /* not delivering and */
3554 (!checking || !address_test_mode) /* not address checking */
3558 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3561 /* When we are retaining a privileged uid, we still change to the exim gid. */
3563 else setgid(exim_gid);
3565 /* Handle a request to list the delivery queue */
3569 set_process_info("listing the queue");
3570 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3574 /* Handle a request to count the delivery queue */
3578 set_process_info("counting the queue");
3583 /* Handle actions on specific messages, except for the force delivery action,
3584 which is done below. Some actions take a whole list of message ids, which
3585 are known to continue up to the end of the arguments. Others take a single
3586 message id and then operate on the recipients list. */
3588 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3590 int yield = EXIT_SUCCESS;
3591 set_process_info("acting on specified messages");
3593 if (!one_msg_action)
3595 for (i = msg_action_arg; i < argc; i++)
3596 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3597 yield = EXIT_FAILURE;
3600 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3601 recipients_arg)) yield = EXIT_FAILURE;
3605 /* All the modes below here require the remaining configuration sections
3606 to be read, except that we can skip over the ACL setting when delivering
3607 specific messages, or doing a queue run. (For various testing cases we could
3608 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3611 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3613 /* The configuration data will have been read into POOL_PERM because we won't
3614 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3615 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3616 configuration were read into POOL_MAIN, because we don't do any resets till
3617 later on. However, it seems right, and it does ensure that both pools get used.
3620 store_pool = POOL_MAIN;
3622 /* Handle the -brt option. This is for checking out retry configurations.
3623 The next three arguments are a domain name or a complete address, and
3624 optionally two error numbers. All it does is to call the function that
3625 scans the retry configuration data. */
3627 if (test_retry_arg >= 0)
3629 retry_config *yield;
3630 int basic_errno = 0;
3634 if (test_retry_arg >= argc)
3636 printf("-brt needs a domain or address argument\n");
3637 exim_exit(EXIT_FAILURE);
3639 s1 = argv[test_retry_arg++];
3642 /* If the first argument contains no @ and no . it might be a local user
3643 or it might be a single-component name. Treat as a domain. */
3645 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3647 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3648 "being \ntreated as a one-component domain, not as a local part.\n\n",
3652 /* There may be an optional second domain arg. */
3654 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3655 s2 = argv[test_retry_arg++];
3657 /* The final arg is an error name */
3659 if (test_retry_arg < argc)
3661 uschar *ss = argv[test_retry_arg];
3663 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3666 printf("%s\n", CS error);
3667 return EXIT_FAILURE;
3670 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3671 an error is for matching codes to the decade. Turn them into a real error
3672 code, off the decade. */
3674 if (basic_errno == ERRNO_RCPT4XX)
3676 int code = (more_errno >> 8) & 255;
3678 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3679 else if (code > 100)
3680 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3684 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3685 if (yield == NULL) printf("No retry information found\n"); else
3688 more_errno = yield->more_errno;
3689 printf("Retry rule: %s ", yield->pattern);
3691 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3693 printf("quota%s%s ",
3694 (more_errno > 0)? "_" : "",
3695 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3697 else if (yield->basic_errno == ECONNREFUSED)
3699 printf("refused%s%s ",
3700 (more_errno > 0)? "_" : "",
3701 (more_errno == 'M')? "MX" :
3702 (more_errno == 'A')? "A" : "");
3704 else if (yield->basic_errno == ETIMEDOUT)
3707 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3709 if (more_errno != 0) printf("_%s",
3710 (more_errno == 'M')? "MX" : "A");
3713 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3714 printf("auth_failed ");
3717 for (r = yield->rules; r != NULL; r = r->next)
3719 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3720 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3726 printf(",%d.", x/1000);
3740 exim_exit(EXIT_SUCCESS);
3743 /* Handle a request to list one or more configuration options */
3747 set_process_info("listing variables");
3748 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3749 else for (i = recipients_arg; i < argc; i++)
3752 (Ustrcmp(argv[i], "router") == 0 ||
3753 Ustrcmp(argv[i], "transport") == 0 ||
3754 Ustrcmp(argv[i], "authenticator") == 0))
3756 readconf_print(argv[i+1], argv[i]);
3759 else readconf_print(argv[i], NULL);
3761 exim_exit(EXIT_SUCCESS);
3765 /* Handle a request to deliver one or more messages that are already on the
3766 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3767 is typically used for a small number when prodding by hand (when the option
3768 forced_delivery will be set) or when re-execing to regain root privilege.
3769 Each message delivery must happen in a separate process, so we fork a process
3770 for each one, and run them sequentially so that debugging output doesn't get
3771 intertwined, and to avoid spawning too many processes if a long list is given.
3772 However, don't fork for the last one; this saves a process in the common case
3773 when Exim is called to deliver just one message. */
3775 if (msg_action_arg > 0)
3777 if (prod_requires_admin && !admin_user)
3779 fprintf(stderr, "exim: Permission denied\n");
3780 exim_exit(EXIT_FAILURE);
3782 set_process_info("delivering specified messages");
3783 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3784 for (i = msg_action_arg; i < argc; i++)
3789 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3790 else if ((pid = fork()) == 0)
3792 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3793 _exit(EXIT_SUCCESS);
3797 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3799 exim_exit(EXIT_FAILURE);
3803 exim_exit(EXIT_SUCCESS);
3807 /* If only a single queue run is requested, without SMTP listening, we can just
3808 turn into a queue runner, with an optional starting message id. */
3810 if (queue_interval == 0 && !daemon_listen)
3812 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3813 (start_queue_run_id == NULL)? US"" : US" starting at ",
3814 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3815 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3816 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3817 set_process_info("running the queue (single queue run)");
3818 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3819 exim_exit(EXIT_SUCCESS);
3823 /* Find the login name of the real user running this process. This is always
3824 needed when receiving a message, because it is written into the spool file. It
3825 may also be used to construct a from: or a sender: header, and in this case we
3826 need the user's full name as well, so save a copy of it, checked for RFC822
3827 syntax and munged if necessary, if it hasn't previously been set by the -F
3828 argument. We may try to get the passwd entry more than once, in case NIS or
3829 other delays are in evidence. Save the home directory for use in filter testing
3834 if ((pw = getpwuid(real_uid)) != NULL)
3836 originator_login = string_copy(US pw->pw_name);
3837 originator_home = string_copy(US pw->pw_dir);
3839 /* If user name has not been set by -F, set it from the passwd entry
3840 unless -f has been used to set the sender address by a trusted user. */
3842 if (originator_name == NULL)
3844 if (sender_address == NULL ||
3845 (!trusted_caller && filter_test == FTEST_NONE))
3847 uschar *name = US pw->pw_gecos;
3848 uschar *amp = Ustrchr(name, '&');
3851 /* Most Unix specify that a '&' character in the gecos field is
3852 replaced by a copy of the login name, and some even specify that
3853 the first character should be upper cased, so that's what we do. */
3858 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3859 amp - name, name, &loffset, originator_login, amp + 1);
3860 buffer[loffset] = toupper(buffer[loffset]);
3864 /* If a pattern for matching the gecos field was supplied, apply
3865 it and then expand the name string. */
3867 if (gecos_pattern != NULL && gecos_name != NULL)
3870 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3872 if (regex_match_and_setup(re, name, 0, -1))
3874 uschar *new_name = expand_string(gecos_name);
3876 if (new_name != NULL)
3878 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3879 "gecos field \"%s\"\n", new_name, name);
3882 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3883 "\"%s\": %s\n", gecos_name, expand_string_message);
3885 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3886 "gecos field \"%s\"\n", gecos_pattern, name);
3887 store_free((void *)re);
3889 originator_name = string_copy(name);
3892 /* A trusted caller has used -f but not -F */
3894 else originator_name = US"";
3897 /* Break the retry loop */
3902 if (++i > finduser_retries) break;
3906 /* If we cannot get a user login, log the incident and give up, unless the
3907 configuration specifies something to use. When running in the test harness,
3908 any setting of unknown_login overrides the actual login name. */
3910 if (originator_login == NULL || running_in_test_harness)
3912 if (unknown_login != NULL)
3914 originator_login = expand_string(unknown_login);
3915 if (originator_name == NULL && unknown_username != NULL)
3916 originator_name = expand_string(unknown_username);
3917 if (originator_name == NULL) originator_name = US"";
3919 if (originator_login == NULL)
3920 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3924 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3927 originator_name = string_copy(parse_fix_phrase(originator_name,
3928 Ustrlen(originator_name), big_buffer, big_buffer_size));
3930 /* If a message is created by this call of Exim, the uid/gid of its originator
3931 are those of the caller. These values are overridden if an existing message is
3932 read in from the spool. */
3934 originator_uid = real_uid;
3935 originator_gid = real_gid;
3937 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3938 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3940 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3941 returns. We leave this till here so that the originator_ fields are available
3942 for incoming messages via the daemon. */
3944 if (daemon_listen || queue_interval > 0)
3946 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be "
3947 "run when mua_wrapper is set");
3951 /* If the sender ident has not been set (by a trusted caller) set it to
3952 the caller. This will get overwritten below for an inetd call. If a trusted
3953 caller has set it empty, unset it. */
3955 if (sender_ident == NULL) sender_ident = originator_login;
3956 else if (sender_ident[0] == 0) sender_ident = NULL;
3958 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3959 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3960 originator_* variables set. */
3962 if (test_rewrite_arg >= 0)
3964 really_exim = FALSE;
3965 if (test_rewrite_arg >= argc)
3967 printf("-brw needs an address argument\n");
3968 exim_exit(EXIT_FAILURE);
3970 rewrite_test(argv[test_rewrite_arg]);
3971 exim_exit(EXIT_SUCCESS);
3974 /* A locally-supplied message is considered to be coming from a local user
3975 unless a trusted caller supplies a sender address with -f, or is passing in the
3976 message via SMTP (inetd invocation or otherwise). */
3978 if ((sender_address == NULL && !smtp_input) ||
3979 (!trusted_caller && filter_test == FTEST_NONE))
3981 sender_local = TRUE;
3983 /* A trusted caller can supply authenticated_sender and authenticated_id
3984 via -oMas and -oMai and if so, they will already be set. */
3986 if (authenticated_sender == NULL)
3987 authenticated_sender = string_sprintf("%s@%s", originator_login,
3988 qualify_domain_sender);
3989 if (authenticated_id == NULL) authenticated_id = originator_login;
3992 /* Trusted callers are always permitted to specify the sender address.
3993 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
3994 is specified is the empty address. However, if a trusted caller does not
3995 specify a sender address for SMTP input, we leave sender_address unset. This
3996 causes the MAIL commands to be honoured. */
3998 if ((!smtp_input && sender_address == NULL) ||
3999 !receive_check_set_sender(sender_address))
4001 /* Either the caller is not permitted to set a general sender, or this is
4002 non-SMTP input and the trusted caller has not set a sender. If there is no
4003 sender, or if a sender other than <> is set, override with the originator's
4004 login (which will get qualified below), except when checking things. */
4006 if (sender_address == NULL /* No sender_address set */
4008 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4009 !checking && /* Not running tests, AND */
4010 filter_test == FTEST_NONE)) /* Not testing a filter */
4012 sender_address = originator_login;
4013 sender_address_forced = FALSE;
4014 sender_address_domain = 0;
4018 /* Remember whether an untrusted caller set the sender address */
4020 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4022 /* Ensure that the sender address is fully qualified unless it is the empty
4023 address, which indicates an error message, or doesn't exist (root caller, smtp
4024 interface, no -f argument). */
4026 if (sender_address != NULL && sender_address[0] != 0 &&
4027 sender_address_domain == 0)
4028 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4029 qualify_domain_sender);
4031 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4033 /* Handle a request to verify a list of addresses, or test them for delivery.
4034 This must follow the setting of the sender address, since routers can be
4035 predicated upon the sender. If no arguments are given, read addresses from
4036 stdin. Set debug_level to at least D_v to get full output for address testing.
4039 if (verify_address_mode || address_test_mode)
4042 int flags = vopt_qualify;
4044 if (verify_address_mode)
4046 if (!verify_as_sender) flags |= vopt_is_recipient;
4047 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4052 flags |= vopt_is_recipient;
4053 debug_selector |= D_v;
4054 debug_file = stderr;
4055 debug_fd = fileno(debug_file);
4056 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4059 if (recipients_arg < argc)
4061 while (recipients_arg < argc)
4063 uschar *s = argv[recipients_arg++];
4066 BOOL finished = FALSE;
4067 uschar *ss = parse_find_address_end(s, FALSE);
4068 if (*ss == ',') *ss = 0; else finished = TRUE;
4069 test_address(s, flags, &exit_value);
4072 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4079 uschar *s = get_stdinput(NULL, NULL);
4080 if (s == NULL) break;
4081 test_address(s, flags, &exit_value);
4085 exim_exit(exit_value);
4088 /* Handle expansion checking */
4092 if (recipients_arg < argc)
4094 while (recipients_arg < argc)
4096 uschar *s = argv[recipients_arg++];
4097 uschar *ss = expand_string(s);
4099 printf ("Failed: %s\n", expand_string_message);
4100 else printf("%s\n", CS ss);
4108 char *(*fn_readline)(char *) = NULL;
4109 char *(*fn_addhist)(char *) = NULL;
4112 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4118 uschar *source = get_stdinput(fn_readline, fn_addhist);
4119 if (source == NULL) break;
4120 ss = expand_string(source);
4122 printf ("Failed: %s\n", expand_string_message);
4123 else printf("%s\n", CS ss);
4127 if (dlhandle != NULL) dlclose(dlhandle);
4131 exim_exit(EXIT_SUCCESS);
4135 /* The active host name is normally the primary host name, but it can be varied
4136 for hosts that want to play several parts at once. We need to ensure that it is
4137 set for host checking, and for receiving messages. */
4139 smtp_active_hostname = primary_hostname;
4140 if (raw_active_hostname != NULL)
4142 uschar *nah = expand_string(raw_active_hostname);
4145 if (!expand_string_forcedfail)
4146 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4147 "(smtp_active_hostname): %s", raw_active_hostname,
4148 expand_string_message);
4150 else if (nah[0] != 0) smtp_active_hostname = nah;
4153 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4154 given IP address so that the blocking and relay configuration can be tested. An
4155 RFC 1413 call is made only if we are running in the test harness and an
4156 incoming interface and both ports are specified, because there is no TCP/IP
4157 call to find the ident for. */
4164 sender_ident = NULL;
4165 if (running_in_test_harness && sender_host_port != 0 &&
4166 interface_address != NULL && interface_port != 0)
4167 verify_get_ident(1413);
4169 /* In case the given address is a non-canonical IPv6 address, canonicize
4170 it. The code works for both IPv4 and IPv6, as it happens. */
4172 size = host_aton(sender_host_address, x);
4173 sender_host_address = store_get(48); /* large enough for full IPv6 */
4174 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4176 /* Now set up for testing */
4178 host_build_sender_fullhost();
4182 sender_local = FALSE;
4183 sender_host_notsocket = TRUE;
4184 debug_file = stderr;
4185 debug_fd = fileno(debug_file);
4186 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4187 "**** but without any ident (RFC 1413) callback.\n"
4188 "**** This is not for real!\n\n",
4189 sender_host_address);
4191 if (verify_check_host(&hosts_connection_nolog) == OK)
4192 log_write_selector &= ~L_smtp_connection;
4193 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4195 if (smtp_start_session())
4197 reset_point = store_get(0);
4200 store_reset(reset_point);
4201 if (smtp_setup_msg() <= 0) break;
4202 if (!receive_msg(FALSE)) break;
4205 exim_exit(EXIT_SUCCESS);
4209 /* Arrange for message reception if recipients or SMTP were specified;
4210 otherwise complain unless a version print (-bV) happened or this is a filter
4211 verification test. In the former case, show the configuration file name. */
4213 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4215 if (version_printed)
4217 printf("Configuration file is %s\n", config_main_filename);
4218 return EXIT_SUCCESS;
4220 if (filter_test == FTEST_NONE)
4223 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4224 "not directly from a shell command line. Options and/or arguments control\n"
4225 "what it does when called. For a list of options, see the Exim documentation.\n");
4226 return EXIT_FAILURE;
4231 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4232 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4233 that we are not called from inetd, because that is rejected above. The
4234 following configuration settings are forced here:
4236 (1) Synchronous delivery (-odi)
4237 (2) Errors to stderr (-oep == -oeq)
4238 (3) No parallel remote delivery
4239 (4) Unprivileged delivery
4241 We don't force overall queueing options because there are several of them;
4242 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4243 to override any SMTP queueing. */
4247 synchronous_delivery = TRUE;
4248 arg_error_handling = ERRORS_STDERR;
4249 remote_max_parallel = 1;
4250 deliver_drop_privilege = TRUE;
4252 queue_smtp_domains = NULL;
4256 /* Prepare to accept one or more new messages on the standard input. When a
4257 message has been read, its id is returned in message_id[]. If doing immediate
4258 delivery, we fork a delivery process for each received message, except for the
4259 last one, where we can save a process switch.
4261 It is only in non-smtp mode that error_handling is allowed to be changed from
4262 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4263 sendmail error modes other than -oem ever actually used? Later: yes.) */
4265 if (!smtp_input) error_handling = arg_error_handling;
4267 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4268 logging being sent down the socket and make an identd call to get the
4273 (void)fclose(stderr);
4274 exim_nullstd(); /* Re-open to /dev/null */
4275 verify_get_ident(IDENT_PORT);
4276 host_build_sender_fullhost();
4277 set_process_info("handling incoming connection from %s via inetd",
4281 /* If the sender host address has been set, build sender_fullhost if it hasn't
4282 already been done (which it will have been for inetd). This caters for the
4283 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4284 so that the test for IP options is skipped for -bs input. */
4286 if (sender_host_address != NULL && sender_fullhost == NULL)
4288 host_build_sender_fullhost();
4289 set_process_info("handling incoming connection from %s via -oMa",
4291 sender_host_notsocket = TRUE;
4294 /* Otherwise, set the sender host as unknown except for inetd calls. This
4295 prevents host checking in the case of -bs not from inetd and also for -bS. */
4297 else if (!is_inetd) sender_host_unknown = TRUE;
4299 /* If stdout does not exist, then dup stdin to stdout. This can happen
4300 if exim is started from inetd. In this case fd 0 will be set to the socket,
4301 but fd 1 will not be set. This also happens for passed SMTP channels. */
4303 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4305 /* Set up the incoming protocol name and the state of the program. Root
4306 is allowed to force received protocol via the -oMr option above, and if we are
4307 in a non-local SMTP state it means we have come via inetd and the process info
4308 has already been set up. We don't set received_protocol here for smtp input,
4309 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4313 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4318 if (received_protocol == NULL)
4319 received_protocol = string_sprintf("local%s", called_as);
4320 set_process_info("accepting a local non-SMTP message from <%s>",
4324 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4328 local_queue_only = queue_only;
4330 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4331 the spool if so configured. On failure, we must not attempt to send an error
4332 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4333 error code is given.) */
4335 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4337 fprintf(stderr, "exim: insufficient disk space\n");
4338 return EXIT_FAILURE;
4341 /* If this is smtp input of any kind, handle the start of the SMTP
4348 if (verify_check_host(&hosts_connection_nolog) == OK)
4349 log_write_selector &= ~L_smtp_connection;
4350 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4351 if (!smtp_start_session())
4354 exim_exit(EXIT_SUCCESS);
4358 /* Otherwise, set up the input size limit here */
4362 thismessage_size_limit = expand_string_integer(message_size_limit);
4363 if (thismessage_size_limit < 0)
4365 if (thismessage_size_limit == -1)
4366 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4367 "message_size_limit: %s", expand_string_message);
4369 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4370 "message_size_limit: %s", expand_string_message);
4374 /* Loop for several messages when reading SMTP input. If we fork any child
4375 processes, we don't want to wait for them unless synchronous delivery is
4376 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4377 same as SIG_DFL, despite the fact that documentation often lists the default as
4378 "ignore". This is a confusing area. This is what I know:
4380 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4381 processes that complete simply to go away without ever becoming defunct. You
4382 can't then wait for them - but we don't want to wait for them in the
4383 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4384 happen for all OS (e.g. *BSD is different).
4386 But that's not the end of the story. Some (many? all?) systems have the
4387 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4388 has by default, so it seems that the difference is merely one of default
4389 (compare restarting vs non-restarting signals).
4391 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4392 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4393 of the loop below. Paranoia rules.
4395 February 2003: That's *still* not the end of the story. There are now versions
4396 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4397 process then calls waitpid(), a grumble is written to the system log, because
4398 this is logically inconsistent. In other words, it doesn't like the paranoia.
4399 As a consequenc of this, the waitpid() below is now excluded if we are sure
4400 that SIG_IGN works. */
4402 if (!synchronous_delivery)
4405 struct sigaction act;
4406 act.sa_handler = SIG_IGN;
4407 sigemptyset(&(act.sa_mask));
4408 act.sa_flags = SA_NOCLDWAIT;
4409 sigaction(SIGCHLD, &act, NULL);
4411 signal(SIGCHLD, SIG_IGN);
4415 /* Save the current store pool point, for resetting at the start of
4416 each message, and save the real sender address, if any. */
4418 reset_point = store_get(0);
4419 real_sender_address = sender_address;
4421 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4422 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4427 store_reset(reset_point);
4430 /* In the SMTP case, we have to handle the initial SMTP input and build the
4431 recipients list, before calling receive_msg() to read the message proper.
4432 Whatever sender address is actually given in the SMTP transaction is
4433 actually ignored for local senders - we use the actual sender, which is
4434 normally either the underlying user running this process or a -f argument
4435 provided by a trusted caller. It is saved in real_sender_address.
4437 However, if this value is NULL, we are dealing with a trusted caller when
4438 -f was not used; in this case, the SMTP sender is allowed to stand.
4440 Also, if untrusted_set_sender is set, we permit sender addresses that match
4441 anything in its list.
4443 The variable raw_sender_address holds the sender address before rewriting. */
4448 if ((rc = smtp_setup_msg()) > 0)
4450 if (real_sender_address != NULL &&
4451 !receive_check_set_sender(sender_address))
4453 sender_address = raw_sender = real_sender_address;
4454 sender_address_unrewritten = NULL;
4456 more = receive_msg(extract_recipients);
4457 if (message_id[0] == 0)
4460 exim_exit(EXIT_FAILURE);
4463 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4466 /* In the non-SMTP case, we have all the information from the command
4467 line, but must process it in case it is in the more general RFC822
4468 format, and in any case, to detect syntax errors. Also, it appears that
4469 the use of comma-separated lists as single arguments is common, so we
4470 had better support them. */
4476 int count = argc - recipients_arg;
4477 uschar **list = argv + recipients_arg;
4479 /* These options cannot be changed dynamically for non-SMTP messages */
4481 active_local_sender_retain = local_sender_retain;
4482 active_local_from_check = local_from_check;
4484 /* Save before any rewriting */
4486 raw_sender = string_copy(sender_address);
4488 /* Loop for each argument */
4490 for (i = 0; i < count; i++)
4492 int start, end, domain;
4494 uschar *s = list[i];
4496 /* Loop for each comma-separated address */
4500 BOOL finished = FALSE;
4502 uschar *ss = parse_find_address_end(s, FALSE);
4504 if (*ss == ',') *ss = 0; else finished = TRUE;
4506 /* Check max recipients - if -t was used, these aren't recipients */
4508 if (recipients_max > 0 && ++rcount > recipients_max &&
4509 !extract_recipients)
4511 if (error_handling == ERRORS_STDERR)
4513 fprintf(stderr, "exim: too many recipients\n");
4514 exim_exit(EXIT_FAILURE);
4519 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4520 errors_sender_rc : EXIT_FAILURE;
4525 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4527 if (domain == 0 && !allow_unqualified_recipient)
4530 errmess = US"unqualified recipient address not allowed";
4533 if (recipient == NULL)
4535 if (error_handling == ERRORS_STDERR)
4537 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4538 string_printing(list[i]), errmess);
4539 exim_exit(EXIT_FAILURE);
4545 eblock.text1 = string_printing(list[i]);
4546 eblock.text2 = errmess;
4548 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4549 errors_sender_rc : EXIT_FAILURE;
4553 receive_add_recipient(recipient, -1);
4556 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4560 /* Show the recipients when debugging */
4565 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4566 if (recipients_list != NULL)
4568 debug_printf("Recipients:\n");
4569 for (i = 0; i < recipients_count; i++)
4570 debug_printf(" %s\n", recipients_list[i].address);
4574 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4575 will just read the headers for the message, and not write anything onto the
4578 message_ended = END_NOTENDED;
4579 more = receive_msg(extract_recipients);
4581 /* more is always FALSE here (not SMTP message) when reading a message
4582 for real; when reading the headers of a message for filter testing,
4583 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4585 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4586 } /* Non-SMTP message reception */
4588 /* If this is a filter testing run, there are headers in store, but
4589 no message on the spool. Run the filtering code in testing mode, setting
4590 the domain to the qualify domain and the local part to the current user,
4591 unless they have been set by options. The prefix and suffix are left unset
4592 unless specified. The the return path is set to to the sender unless it has
4593 already been set from a return-path header in the message. */
4595 if (filter_test != FTEST_NONE)
4597 deliver_domain = (ftest_domain != NULL)?
4598 ftest_domain : qualify_domain_recipient;
4599 deliver_domain_orig = deliver_domain;
4600 deliver_localpart = (ftest_localpart != NULL)?
4601 ftest_localpart : originator_login;
4602 deliver_localpart_orig = deliver_localpart;
4603 deliver_localpart_prefix = ftest_prefix;
4604 deliver_localpart_suffix = ftest_suffix;
4605 deliver_home = originator_home;
4607 if (return_path == NULL)
4609 printf("Return-path copied from sender\n");
4610 return_path = string_copy(sender_address);
4614 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4616 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4618 receive_add_recipient(
4619 string_sprintf("%s%s%s@%s",
4620 (ftest_prefix == NULL)? US"" : ftest_prefix,
4622 (ftest_suffix == NULL)? US"" : ftest_suffix,
4623 deliver_domain), -1);
4625 printf("Recipient = %s\n", recipients_list[0].address);
4626 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4627 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4629 (void)chdir("/"); /* Get away from wherever the user is running this from */
4631 /* Now we run either a system filter test, or a user filter test, or both.
4632 In the latter case, headers added by the system filter will persist and be
4633 available to the user filter. We need to copy the filter variables
4636 if ((filter_test & FTEST_SYSTEM) != 0)
4638 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4639 exim_exit(EXIT_FAILURE);
4642 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4644 if ((filter_test & FTEST_USER) != 0)
4646 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4647 exim_exit(EXIT_FAILURE);
4650 exim_exit(EXIT_SUCCESS);
4653 /* Else act on the result of message reception. We should not get here unless
4654 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4655 TRUE. If it is not, check on the number of messages received in this
4656 connection. If that's OK and queue_only_load is set, check that the load
4657 average is below it. If it is not, set local_queue_only TRUE. Note that it
4658 then remains this way for any subsequent messages on the same SMTP connection.
4659 This is a deliberate choice; even though the load average may fall, it
4660 doesn't seem right to deliver later messages on the same call when not
4661 delivering earlier ones. */
4663 if (!local_queue_only)
4665 if (smtp_accept_queue_per_connection > 0 &&
4666 receive_messagecount > smtp_accept_queue_per_connection)
4668 local_queue_only = TRUE;
4669 queue_only_reason = 2;
4671 else if (queue_only_load >= 0)
4673 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4674 if (local_queue_only) queue_only_reason = 3;
4678 /* If running as an MUA wrapper, all queueing options and freezing options
4682 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4684 /* Log the queueing here, when it will get a message id attached, but
4685 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4688 if (local_queue_only) switch(queue_only_reason)
4691 log_write(L_delay_delivery,
4692 LOG_MAIN, "no immediate delivery: more than %d messages "
4693 "received in one connection", smtp_accept_queue_per_connection);
4697 log_write(L_delay_delivery,
4698 LOG_MAIN, "no immediate delivery: load average %.2f",
4699 (double)load_average/1000.0);
4703 /* Else do the delivery unless the ACL or local_scan() called for queue only
4704 or froze the message. Always deliver in a separate process. A fork failure is
4705 not a disaster, as the delivery will eventually happen on a subsequent queue
4706 run. The search cache must be tidied before the fork, as the parent will
4707 do it before exiting. The child will trigger a lookup failure and
4708 thereby defer the delivery if it tries to use (for example) a cached ldap
4709 connection that the parent has called unbind on. */
4711 else if (!queue_only_policy && !deliver_freeze)
4716 if ((pid = fork()) == 0)
4719 close_unwanted(); /* Close unwanted file descriptors and TLS */
4720 exim_nullstd(); /* Ensure std{in,out,err} exist */
4722 /* Occasionally in the test harness we don't have synchronous delivery
4723 set (can happen with bounces). In that case, let the old process finish
4724 before continuing, to keep the debug output the same. */
4726 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4728 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4729 mode, deliver_drop_privilege is forced TRUE). */
4731 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4733 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4735 /* Control does not return here. */
4738 /* No need to re-exec */
4740 rc = deliver_message(message_id, FALSE, FALSE);
4742 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4743 EXIT_SUCCESS : EXIT_FAILURE);
4748 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4749 "process: %s", strerror(errno));
4752 /* In the parent, wait if synchronous delivery is required. This will
4753 always be the case in MUA wrapper mode. */
4755 else if (synchronous_delivery)
4758 while (wait(&status) != pid);
4759 if ((status & 0x00ff) != 0)
4760 log_write(0, LOG_MAIN|LOG_PANIC,
4761 "process %d crashed with signal %d while delivering %s",
4762 (int)pid, status & 0x00ff, message_id);
4763 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4767 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4768 automatically reaps children (see comments above the loop), clear away any
4769 finished subprocesses here, in case there are lots of messages coming in
4770 from the same source. */
4772 #ifndef SIG_IGN_WORKS
4773 while (waitpid(-1, NULL, WNOHANG) > 0);
4777 exim_exit(EXIT_SUCCESS); /* Never returns */
4778 return 0; /* To stop compiler warning */