1 /* $Cambridge: exim/src/src/exim.c,v 1.34 2006/02/21 16:24:19 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * 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_address_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:");
836 #ifdef SUPPORT_CRYPTEQ
837 fprintf(f, " crypteq");
840 fprintf(f, " iconv()");
845 #ifdef HAVE_LOGIN_CAP
846 fprintf(f, " use_classresources");
855 fprintf(f, " Expand_dlfunc");
857 #ifdef USE_TCP_WRAPPERS
858 fprintf(f, " TCPwrappers");
862 fprintf(f, " GnuTLS");
864 fprintf(f, " OpenSSL");
867 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
868 fprintf(f, " translate_ip_address");
870 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
871 fprintf(f, " move_frozen_messages");
873 #ifdef WITH_CONTENT_SCAN
874 fprintf(f, " Content_Scanning");
876 #ifdef WITH_OLD_DEMIME
877 fprintf(f, " Old_Demime");
879 #ifdef EXPERIMENTAL_SPF
880 fprintf(f, " Experimental_SPF");
882 #ifdef EXPERIMENTAL_SRS
883 fprintf(f, " Experimental_SRS");
885 #ifdef EXPERIMENTAL_BRIGHTMAIL
886 fprintf(f, " Experimental_Brightmail");
888 #ifdef EXPERIMENTAL_DOMAINKEYS
889 fprintf(f, " Experimental_DomainKeys");
893 fprintf(f, "Lookups:");
894 #ifdef LOOKUP_LSEARCH
895 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
901 fprintf(f, " dbm dbmnz");
904 fprintf(f, " dnsdb");
906 #ifdef LOOKUP_DSEARCH
907 fprintf(f, " dsearch");
910 fprintf(f, " ibase");
913 fprintf(f, " ldap ldapdn ldapm");
916 fprintf(f, " mysql");
919 fprintf(f, " nis nis0");
921 #ifdef LOOKUP_NISPLUS
922 fprintf(f, " nisplus");
925 fprintf(f, " oracle");
928 fprintf(f, " passwd");
931 fprintf(f, " pgsql");
934 fprintf(f, " sqlite");
937 fprintf(f, " testdb");
940 fprintf(f, " whoson");
944 fprintf(f, "Authenticators:");
946 fprintf(f, " cram_md5");
948 #ifdef AUTH_CYRUS_SASL
949 fprintf(f, " cyrus_sasl");
951 #ifdef AUTH_PLAINTEXT
952 fprintf(f, " plaintext");
959 fprintf(f, "Routers:");
961 fprintf(f, " accept");
963 #ifdef ROUTER_DNSLOOKUP
964 fprintf(f, " dnslookup");
966 #ifdef ROUTER_IPLITERAL
967 fprintf(f, " ipliteral");
969 #ifdef ROUTER_IPLOOKUP
970 fprintf(f, " iplookup");
972 #ifdef ROUTER_MANUALROUTE
973 fprintf(f, " manualroute");
975 #ifdef ROUTER_QUERYPROGRAM
976 fprintf(f, " queryprogram");
978 #ifdef ROUTER_REDIRECT
979 fprintf(f, " redirect");
983 fprintf(f, "Transports:");
984 #ifdef TRANSPORT_APPENDFILE
985 fprintf(f, " appendfile");
986 #ifdef SUPPORT_MAILDIR
987 fprintf(f, "/maildir");
989 #ifdef SUPPORT_MAILSTORE
990 fprintf(f, "/mailstore");
996 #ifdef TRANSPORT_AUTOREPLY
997 fprintf(f, " autoreply");
999 #ifdef TRANSPORT_LMTP
1000 fprintf(f, " lmtp");
1002 #ifdef TRANSPORT_PIPE
1003 fprintf(f, " pipe");
1005 #ifdef TRANSPORT_SMTP
1006 fprintf(f, " smtp");
1010 if (fixed_never_users[0] > 0)
1013 fprintf(f, "Fixed never_users: ");
1014 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1015 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1016 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1019 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1025 /*************************************************
1026 * Quote a local part *
1027 *************************************************/
1029 /* This function is used when a sender address or a From: or Sender: header
1030 line is being created from the caller's login, or from an authenticated_id. It
1031 applies appropriate quoting rules for a local part.
1033 Argument: the local part
1034 Returns: the local part, quoted if necessary
1038 local_part_quote(uschar *lpart)
1040 BOOL needs_quote = FALSE;
1045 for (t = lpart; !needs_quote && *t != 0; t++)
1047 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1048 (*t != '.' || t == lpart || t[1] == 0);
1051 if (!needs_quote) return lpart;
1054 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1058 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1061 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1064 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1065 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1066 yield = string_cat(yield, &size, &ptr, nq, 1);
1070 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1078 /*************************************************
1079 * Load readline() functions *
1080 *************************************************/
1082 /* This function is called from testing executions that read data from stdin,
1083 but only when running as the calling user. Currently, only -be does this. The
1084 function loads the readline() function library and passes back the functions.
1085 On some systems, it needs the curses library, so load that too, but try without
1086 it if loading fails. All this functionality has to be requested at build time.
1089 fn_readline_ptr pointer to where to put the readline pointer
1090 fn_addhist_ptr pointer to where to put the addhistory function
1092 Returns: the dlopen handle or NULL on failure
1096 set_readline(char * (**fn_readline_ptr)(char *),
1097 char * (**fn_addhist_ptr)(char *))
1100 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1102 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1103 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1105 if (dlhandle != NULL)
1107 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1108 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1112 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1121 /*************************************************
1122 * Get a line from stdin for testing things *
1123 *************************************************/
1125 /* This function is called when running tests that can take a number of lines
1126 of input (for example, -be and -bt). It handles continuations and trailing
1127 spaces. And prompting and a blank line output on eof. If readline() is in use,
1128 the arguments are non-NULL and provide the relevant functions.
1131 fn_readline readline function or NULL
1132 fn_addhist addhist function or NULL
1134 Returns: pointer to dynamic memory, or NULL at end of file
1138 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1143 uschar *yield = NULL;
1145 if (fn_readline == NULL) printf("> ");
1149 uschar buffer[1024];
1153 char *readline_line = NULL;
1154 if (fn_readline != NULL)
1156 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1157 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1158 p = US readline_line;
1163 /* readline() not in use */
1166 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1170 /* Handle the line */
1172 ss = p + (int)Ustrlen(p);
1173 while (ss > p && isspace(ss[-1])) ss--;
1177 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1180 yield = string_cat(yield, &size, &ptr, p, ss - p);
1183 if (fn_readline != NULL) free(readline_line);
1186 if (ss == p || yield[ptr-1] != '\\')
1194 if (yield == NULL) printf("\n");
1200 /*************************************************
1201 * Entry point and high-level code *
1202 *************************************************/
1204 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1205 the appropriate action. All the necessary functions are present in the one
1206 binary. I originally thought one should split it up, but it turns out that so
1207 much of the apparatus is needed in each chunk that one might as well just have
1208 it all available all the time, which then makes the coding easier as well.
1211 argc count of entries in argv
1212 argv argument strings, with argv[0] being the program name
1214 Returns: EXIT_SUCCESS if terminated successfully
1215 EXIT_FAILURE otherwise, except when a message has been sent
1216 to the sender, and -oee was given
1220 main(int argc, char **cargv)
1222 uschar **argv = USS cargv;
1223 int arg_receive_timeout = -1;
1224 int arg_smtp_receive_timeout = -1;
1225 int arg_error_handling = error_handling;
1226 int filter_sfd = -1;
1227 int filter_ufd = -1;
1230 int list_queue_option = 0;
1232 int msg_action_arg = -1;
1233 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1234 int queue_only_reason = 0;
1236 int perl_start_option = 0;
1238 int recipients_arg = argc;
1239 int sender_address_domain = 0;
1240 int test_retry_arg = -1;
1241 int test_rewrite_arg = -1;
1242 BOOL arg_queue_only = FALSE;
1243 BOOL bi_option = FALSE;
1244 BOOL checking = FALSE;
1245 BOOL count_queue = FALSE;
1246 BOOL expansion_test = FALSE;
1247 BOOL extract_recipients = FALSE;
1248 BOOL forced_delivery = FALSE;
1249 BOOL f_end_dot = FALSE;
1250 BOOL deliver_give_up = FALSE;
1251 BOOL list_queue = FALSE;
1252 BOOL list_options = FALSE;
1253 BOOL local_queue_only;
1255 BOOL one_msg_action = FALSE;
1256 BOOL queue_only_set = FALSE;
1257 BOOL receiving_message = TRUE;
1259 BOOL removed_privilege = FALSE;
1260 BOOL verify_address_mode = FALSE;
1261 BOOL verify_as_sender = FALSE;
1262 BOOL version_printed = FALSE;
1263 uschar *alias_arg = NULL;
1264 uschar *called_as = US"";
1265 uschar *start_queue_run_id = NULL;
1266 uschar *stop_queue_run_id = NULL;
1267 uschar *ftest_domain = NULL;
1268 uschar *ftest_localpart = NULL;
1269 uschar *ftest_prefix = NULL;
1270 uschar *ftest_suffix = NULL;
1271 uschar *real_sender_address;
1272 uschar *originator_home = US"/";
1276 struct stat statbuf;
1277 pid_t passed_qr_pid = (pid_t)0;
1278 int passed_qr_pipe = -1;
1279 gid_t group_list[NGROUPS_MAX];
1281 /* Possible options for -R and -S */
1283 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1285 /* Need to define this in case we need to change the environment in order
1286 to get rid of a bogus time zone. We have to make it char rather than uschar
1287 because some OS define it in /usr/include/unistd.h. */
1289 extern char **environ;
1291 /* If the Exim user and/or group and/or the configuration file owner/group were
1292 defined by ref:name at build time, we must now find the actual uid/gid values.
1293 This is a feature to make the lives of binary distributors easier. */
1295 #ifdef EXIM_USERNAME
1296 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1298 exim_gid = pw->pw_gid;
1302 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1308 #ifdef EXIM_GROUPNAME
1309 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1311 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1317 #ifdef CONFIGURE_OWNERNAME
1318 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1320 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1321 CONFIGURE_OWNERNAME);
1326 #ifdef CONFIGURE_GROUPNAME
1327 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1329 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1330 CONFIGURE_GROUPNAME);
1335 /* In the Cygwin environment, some initialization needs doing. It is fudged
1336 in by means of this macro. */
1342 /* Check a field which is patched when we are running Exim within its
1343 testing harness; do a fast initial check, and then the whole thing. */
1345 running_in_test_harness =
1346 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1348 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1349 at the start of a program; however, it seems that some environments do not
1350 follow this. A "strange" locale can affect the formatting of timestamps, so we
1353 setlocale(LC_ALL, "C");
1355 /* Set up the default handler for timing using alarm(). */
1357 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1359 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1360 because store_malloc writes a log entry on failure. */
1362 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1363 if (log_buffer == NULL)
1365 fprintf(stderr, "exim: failed to get store for log buffer\n");
1369 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1370 NULL when the daemon is run and the file is closed. We have to use this
1371 indirection, because some systems don't allow writing to the variable "stderr".
1374 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1376 /* Arrange for the PCRE regex library to use our store functions. Note that
1377 the normal calls are actually macros that add additional arguments for
1378 debugging purposes so we have to assign specially constructed functions here.
1379 The default is to use store in the stacking pool, but this is overridden in the
1380 regex_must_compile() function. */
1382 pcre_malloc = function_store_get;
1383 pcre_free = function_dummy_free;
1385 /* Ensure there is a big buffer for temporary use in several places. It is put
1386 in malloc store so that it can be freed for enlargement if necessary. */
1388 big_buffer = store_malloc(big_buffer_size);
1390 /* Set up the handler for the data request signal, and set the initial
1391 descriptive text. */
1393 set_process_info("initializing");
1394 os_restarting_signal(SIGUSR1, usr1_handler);
1396 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1397 in the daemon code. For the rest of Exim's uses, we ignore it. */
1399 signal(SIGHUP, SIG_IGN);
1401 /* We don't want to die on pipe errors as the code is written to handle
1402 the write error instead. */
1404 signal(SIGPIPE, SIG_IGN);
1406 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1407 set to SIG_IGN. This causes subprocesses that complete before the parent
1408 process waits for them not to hang around, so when Exim calls wait(), nothing
1409 is there. The wait() code has been made robust against this, but let's ensure
1410 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1411 ending status. We use sigaction rather than plain signal() on those OS where
1412 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1413 problem on AIX with this.) */
1417 struct sigaction act;
1418 act.sa_handler = SIG_DFL;
1419 sigemptyset(&(act.sa_mask));
1421 sigaction(SIGCHLD, &act, NULL);
1424 signal(SIGCHLD, SIG_DFL);
1427 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1432 /* Set up the version number. Set up the leading 'E' for the external form of
1433 message ids, set the pointer to the internal form, and initialize it to
1434 indicate no message being processed. */
1437 message_id_option[0] = '-';
1438 message_id_external = message_id_option + 1;
1439 message_id_external[0] = 'E';
1440 message_id = message_id_external + 1;
1443 /* Set the umask to zero so that any files that Exim creates are created
1444 with the modes that it specifies. */
1448 /* Precompile the regular expression for matching a message id. Keep this in
1449 step with the code that generates ids in the accept.c module. We need to do
1450 this here, because the -M options check their arguments for syntactic validity
1451 using mac_ismsgid, which uses this. */
1454 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1456 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1457 this seems to be a generally accepted convention, since one finds symbolic
1458 links called "mailq" in standard OS configurations. */
1460 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1461 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1464 receiving_message = FALSE;
1465 called_as = US"-mailq";
1468 /* If the program is called as "rmail" treat it as equivalent to
1469 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1470 i.e. preventing a single dot on a line from terminating the message, and
1471 returning with zero return code, even in cases of error (provided an error
1472 message has been sent). */
1474 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1475 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1478 called_as = US"-rmail";
1479 errors_sender_rc = EXIT_SUCCESS;
1482 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1483 this is a smail convention. */
1485 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1486 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1488 smtp_input = smtp_batched_input = TRUE;
1489 called_as = US"-rsmtp";
1492 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1493 this is a smail convention. */
1495 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1496 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1499 receiving_message = FALSE;
1500 called_as = US"-runq";
1503 /* If the program is called as "newaliases" treat it as equivalent to
1504 "exim -bi"; this is a sendmail convention. */
1506 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1507 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1510 receiving_message = FALSE;
1511 called_as = US"-newaliases";
1514 /* Save the original effective uid for a couple of uses later. It should
1515 normally be root, but in some esoteric environments it may not be. */
1517 original_euid = geteuid();
1519 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1520 to be the same as the real ones. This makes a difference only if Exim is setuid
1521 (or setgid) to something other than root, which could be the case in some
1522 special configurations. */
1524 real_uid = getuid();
1525 real_gid = getgid();
1527 if (real_uid == root_uid)
1533 /* If neither the original real uid nor the original euid was root, Exim is
1534 running in an unprivileged state. */
1536 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1538 /* If the first argument is --help, pretend there are no arguments. This will
1539 cause a brief message to be given. */
1541 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1543 /* Scan the program's arguments. Some can be dealt with right away; others are
1544 simply recorded for checking and handling afterwards. Do a high-level switch
1545 on the second character (the one after '-'), to save some effort. */
1547 for (i = 1; i < argc; i++)
1549 BOOL badarg = FALSE;
1550 uschar *arg = argv[i];
1554 /* An argument not starting with '-' is the start of a recipients list;
1555 break out of the options-scanning loop. */
1563 /* An option consistion of -- terminates the options */
1565 if (Ustrcmp(arg, "--") == 0)
1567 recipients_arg = i + 1;
1571 /* Handle flagged options */
1573 switchchar = arg[1];
1576 /* Make all -ex options synonymous with -oex arguments, since that
1577 is assumed by various callers. Also make -qR options synonymous with -R
1578 options, as that seems to be required as well. Allow for -qqR too, and
1579 the same for -S options. */
1581 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1582 Ustrncmp(arg+1, "qR", 2) == 0 ||
1583 Ustrncmp(arg+1, "qS", 2) == 0)
1585 switchchar = arg[2];
1588 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1590 switchchar = arg[3];
1592 queue_2stage = TRUE;
1595 /* Make -r synonymous with -f, since it is a documented alias */
1597 else if (arg[1] == 'r') switchchar = 'f';
1599 /* Make -ov synonymous with -v */
1601 else if (Ustrcmp(arg, "-ov") == 0)
1607 /* High-level switch on active initial letter */
1611 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1612 so has no need of it. */
1615 if (*argrest == 0) i++; /* Skip over the type */
1620 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1622 /* -bd: Run in daemon mode, awaiting SMTP connections.
1623 -bdf: Ditto, but in the foreground.
1626 if (*argrest == 'd')
1628 daemon_listen = TRUE;
1629 if (*(++argrest) == 'f') background_daemon = FALSE;
1630 else if (*argrest != 0) { badarg = TRUE; break; }
1633 /* -be: Run in expansion test mode */
1635 else if (*argrest == 'e')
1636 expansion_test = checking = TRUE;
1638 /* -bF: Run system filter test */
1640 else if (*argrest == 'F')
1642 filter_test |= FTEST_SYSTEM;
1643 if (*(++argrest) != 0) { badarg = TRUE; break; }
1644 if (++i < argc) filter_test_sfile = argv[i]; else
1646 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1651 /* -bf: Run user filter test
1652 -bfd: Set domain for filter testing
1653 -bfl: Set local part for filter testing
1654 -bfp: Set prefix for filter testing
1655 -bfs: Set suffix for filter testing
1658 else if (*argrest == 'f')
1660 if (*(++argrest) == 0)
1662 filter_test |= FTEST_USER;
1663 if (++i < argc) filter_test_ufile = argv[i]; else
1665 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1673 fprintf(stderr, "exim: string expected after %s\n", arg);
1676 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1677 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1678 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1679 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1680 else { badarg = TRUE; break; }
1684 /* -bh: Host checking - an IP address must follow. */
1686 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1688 if (++i >= argc) { badarg = TRUE; break; }
1689 sender_host_address = argv[i];
1690 host_checking = checking = log_testing_mode = TRUE;
1691 host_checking_callout = argrest[1] == 'c';
1694 /* -bi: This option is used by sendmail to initialize *the* alias file,
1695 though it has the -oA option to specify a different file. Exim has no
1696 concept of *the* alias file, but since Sun's YP make script calls
1697 sendmail this way, some support must be provided. */
1699 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1701 /* -bm: Accept and deliver message - the default option. Reinstate
1702 receiving_message, which got turned off for all -b options. */
1704 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1706 /* -bnq: For locally originating messages, do not qualify unqualified
1707 addresses. In the envelope, this causes errors; in header lines they
1710 else if (Ustrcmp(argrest, "nq") == 0)
1712 allow_unqualified_sender = FALSE;
1713 allow_unqualified_recipient = FALSE;
1716 /* -bpxx: List the contents of the mail queue, in various forms. If
1717 the option is -bpc, just a queue count is needed. Otherwise, if the
1718 first letter after p is r, then order is random. */
1720 else if (*argrest == 'p')
1722 if (*(++argrest) == 'c')
1725 if (*(++argrest) != 0) badarg = TRUE;
1729 if (*argrest == 'r')
1731 list_queue_option = 8;
1734 else list_queue_option = 0;
1738 /* -bp: List the contents of the mail queue, top-level only */
1740 if (*argrest == 0) {}
1742 /* -bpu: List the contents of the mail queue, top-level undelivered */
1744 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1746 /* -bpa: List the contents of the mail queue, including all delivered */
1748 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1750 /* Unknown after -bp[r] */
1760 /* -bP: List the configuration variables given as the address list.
1761 Force -v, so configuration errors get displayed. */
1763 else if (Ustrcmp(argrest, "P") == 0)
1765 list_options = TRUE;
1766 debug_selector |= D_v;
1767 debug_file = stderr;
1770 /* -brt: Test retry configuration lookup */
1772 else if (Ustrcmp(argrest, "rt") == 0)
1774 test_retry_arg = i + 1;
1778 /* -brw: Test rewrite configuration */
1780 else if (Ustrcmp(argrest, "rw") == 0)
1782 test_rewrite_arg = i + 1;
1786 /* -bS: Read SMTP commands on standard input, but produce no replies -
1787 all errors are reported by sending messages. */
1789 else if (Ustrcmp(argrest, "S") == 0)
1790 smtp_input = smtp_batched_input = receiving_message = TRUE;
1792 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1793 on standard output. */
1795 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1797 /* -bt: address testing mode */
1799 else if (Ustrcmp(argrest, "t") == 0)
1800 address_test_mode = checking = log_testing_mode = TRUE;
1802 /* -bv: verify addresses */
1804 else if (Ustrcmp(argrest, "v") == 0)
1805 verify_address_mode = checking = log_testing_mode = TRUE;
1807 /* -bvs: verify sender addresses */
1809 else if (Ustrcmp(argrest, "vs") == 0)
1811 verify_address_mode = checking = log_testing_mode = TRUE;
1812 verify_as_sender = TRUE;
1815 /* -bV: Print version string and support details */
1817 else if (Ustrcmp(argrest, "V") == 0)
1819 printf("Exim version %s #%s built %s\n", version_string,
1820 version_cnumber, version_date);
1821 printf("%s\n", CS version_copyright);
1822 version_printed = TRUE;
1823 show_whats_supported(stdout);
1830 /* -C: change configuration file list; ignore if it isn't really
1831 a change! Enforce a prefix check if required. */
1836 if(++i < argc) argrest = argv[i]; else
1837 { badarg = TRUE; break; }
1839 if (Ustrcmp(config_main_filelist, argrest) != 0)
1841 #ifdef ALT_CONFIG_PREFIX
1843 int len = Ustrlen(ALT_CONFIG_PREFIX);
1844 uschar *list = argrest;
1846 while((filename = string_nextinlist(&list, &sep, big_buffer,
1847 big_buffer_size)) != NULL)
1849 if ((Ustrlen(filename) < len ||
1850 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1851 Ustrstr(filename, "/../") != NULL) &&
1852 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1854 fprintf(stderr, "-C Permission denied\n");
1860 config_main_filelist = argrest;
1861 config_changed = TRUE;
1866 /* -D: set up a macro definition */
1869 #ifdef DISABLE_D_OPTION
1870 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1875 macro_item *mlast = NULL;
1878 uschar *s = argrest;
1880 while (isspace(*s)) s++;
1882 if (*s < 'A' || *s > 'Z')
1884 fprintf(stderr, "exim: macro name set by -D must start with "
1885 "an upper case letter\n");
1889 while (isalnum(*s) || *s == '_')
1891 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1895 if (ptr == 0) { badarg = TRUE; break; }
1896 while (isspace(*s)) s++;
1899 if (*s++ != '=') { badarg = TRUE; break; }
1900 while (isspace(*s)) s++;
1903 for (m = macros; m != NULL; m = m->next)
1905 if (Ustrcmp(m->name, name) == 0)
1907 fprintf(stderr, "exim: duplicated -D in command line\n");
1913 m = store_get(sizeof(macro_item) + Ustrlen(name));
1915 m->command_line = TRUE;
1916 if (mlast == NULL) macros = m; else mlast->next = m;
1917 Ustrcpy(m->name, name);
1918 m->replacement = string_copy(s);
1920 if (clmacro_count >= MAX_CLMACROS)
1922 fprintf(stderr, "exim: too many -D options on command line\n");
1925 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1931 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1932 The latter is now a no-op, retained for compatibility only. If -dd is used,
1933 debugging subprocesses of the daemon is disabled. */
1936 if (Ustrcmp(argrest, "ropcr") == 0)
1938 /* drop_cr = TRUE; */
1941 /* Use an intermediate variable so that we don't set debugging while
1942 decoding the debugging bits. */
1946 unsigned int selector = D_default;
1949 if (*argrest == 'd')
1951 debug_daemon = TRUE;
1955 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1956 debug_options_count, US"debug");
1957 debug_selector = selector;
1962 /* -E: This is a local error message. This option is not intended for
1963 external use at all, but is not restricted to trusted callers because it
1964 does no harm (just suppresses certain error messages) and if Exim is run
1965 not setuid root it won't always be trusted when it generates error
1966 messages using this option. If there is a message id following -E, point
1967 message_reference at it, for logging. */
1970 local_error_message = TRUE;
1971 if (mac_ismsgid(argrest)) message_reference = argrest;
1975 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1976 option, so it looks as if historically the -oex options are also callable
1977 without the leading -o. So we have to accept them. Before the switch,
1978 anything starting -oe has been converted to -e. Exim does not support all
1979 of the sendmail error options. */
1982 if (Ustrcmp(argrest, "e") == 0)
1984 arg_error_handling = ERRORS_SENDER;
1985 errors_sender_rc = EXIT_SUCCESS;
1987 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1988 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1989 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1990 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1995 /* -F: Set sender's full name, used instead of the gecos entry from
1996 the password file. Since users can usually alter their gecos entries,
1997 there's no security involved in using this instead. The data can follow
1998 the -F or be in the next argument. */
2003 if(++i < argc) argrest = argv[i]; else
2004 { badarg = TRUE; break; }
2006 originator_name = argrest;
2007 sender_name_forced = TRUE;
2011 /* -f: Set sender's address - this value is only actually used if Exim is
2012 run by a trusted user, or if untrusted_set_sender is set and matches the
2013 address, except that the null address can always be set by any user. The
2014 test for this happens later, when the value given here is ignored when not
2015 permitted. For an untrusted user, the actual sender is still put in Sender:
2016 if it doesn't match the From: header (unless no_local_from_check is set).
2017 The data can follow the -f or be in the next argument. The -r switch is an
2018 obsolete form of -f but since there appear to be programs out there that
2019 use anything that sendmail has ever supported, better accept it - the
2020 synonymizing is done before the switch above.
2022 At this stage, we must allow domain literal addresses, because we don't
2023 know what the setting of allow_domain_literals is yet. Ditto for trailing
2024 dots and strip_trailing_dot. */
2032 if (i+1 < argc) argrest = argv[++i]; else
2033 { badarg = TRUE; break; }
2037 sender_address = string_sprintf(""); /* Ensure writeable memory */
2041 uschar *temp = argrest + Ustrlen(argrest) - 1;
2042 while (temp >= argrest && isspace(*temp)) temp--;
2043 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2044 allow_domain_literals = TRUE;
2045 strip_trailing_dot = TRUE;
2046 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2047 &sender_address_domain, TRUE);
2048 allow_domain_literals = FALSE;
2049 strip_trailing_dot = FALSE;
2050 if (sender_address == NULL)
2052 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2053 return EXIT_FAILURE;
2056 sender_address_forced = TRUE;
2060 /* This is some Sendmail thing which can be ignored */
2065 /* -h: Set the hop count for an incoming message. Exim does not currently
2066 support this; it always computes it by counting the Received: headers.
2067 To put it in will require a change to the spool header file format. */
2072 if(++i < argc) argrest = argv[i]; else
2073 { badarg = TRUE; break; }
2075 if (!isdigit(*argrest)) badarg = TRUE;
2079 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2080 not to be documented for sendmail but mailx (at least) uses it) */
2083 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2088 receiving_message = FALSE;
2090 /* -MC: continue delivery of another message via an existing open
2091 file descriptor. This option is used for an internal call by the
2092 smtp transport when there is a pending message waiting to go to an
2093 address to which it has got a connection. Five subsequent arguments are
2094 required: transport name, host name, IP address, sequence number, and
2095 message_id. Transports may decline to create new processes if the sequence
2096 number gets too big. The channel is stdin. This (-MC) must be the last
2097 argument. There's a subsequent check that the real-uid is privileged.
2099 If we are running in the test harness. delay for a bit, to let the process
2100 that set this one up complete. This makes for repeatability of the logging,
2103 if (Ustrcmp(argrest, "C") == 0)
2107 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2108 return EXIT_FAILURE;
2111 if (msg_action_arg >= 0)
2113 fprintf(stderr, "exim: incompatible arguments\n");
2114 return EXIT_FAILURE;
2117 continue_transport = argv[++i];
2118 continue_hostname = argv[++i];
2119 continue_host_address = argv[++i];
2120 continue_sequence = Uatoi(argv[++i]);
2121 msg_action = MSG_DELIVER;
2122 msg_action_arg = ++i;
2123 forced_delivery = TRUE;
2124 queue_run_pid = passed_qr_pid;
2125 queue_run_pipe = passed_qr_pipe;
2127 if (!mac_ismsgid(argv[i]))
2129 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2131 return EXIT_FAILURE;
2134 if (running_in_test_harness) millisleep(500);
2138 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2139 precedes -MC (see above). The flag indicates that the host to which
2140 Exim is connected has accepted an AUTH sequence. */
2142 else if (Ustrcmp(argrest, "CA") == 0)
2144 smtp_authenticated = TRUE;
2148 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2149 it preceded -MC (see above) */
2151 else if (Ustrcmp(argrest, "CP") == 0)
2153 smtp_use_pipelining = TRUE;
2157 /* -MCQ: pass on the pid of the queue-running process that started
2158 this chain of deliveries and the fd of its synchronizing pipe; this
2159 is useful only when it precedes -MC (see above) */
2161 else if (Ustrcmp(argrest, "CQ") == 0)
2163 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2165 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2170 /* -MCS: set the smtp_use_size flag; this is useful only when it
2171 precedes -MC (see above) */
2173 else if (Ustrcmp(argrest, "CS") == 0)
2175 smtp_use_size = TRUE;
2179 /* -MCT: set the tls_offered flag; this is useful only when it
2180 precedes -MC (see above). The flag indicates that the host to which
2181 Exim is connected has offered TLS support. */
2184 else if (Ustrcmp(argrest, "CT") == 0)
2191 /* -M[x]: various operations on the following list of message ids:
2192 -M deliver the messages, ignoring next retry times and thawing
2193 -Mc deliver the messages, checking next retry times, no thawing
2194 -Mf freeze the messages
2195 -Mg give up on the messages
2196 -Mt thaw the messages
2197 -Mrm remove the messages
2198 In the above cases, this must be the last option. There are also the
2199 following options which are followed by a single message id, and which
2200 act on that message. Some of them use the "recipient" addresses as well.
2201 -Mar add recipient(s)
2202 -Mmad mark all recipients delivered
2203 -Mmd mark recipients(s) delivered
2210 else if (*argrest == 0)
2212 msg_action = MSG_DELIVER;
2213 forced_delivery = deliver_force_thaw = TRUE;
2215 else if (Ustrcmp(argrest, "ar") == 0)
2217 msg_action = MSG_ADD_RECIPIENT;
2218 one_msg_action = TRUE;
2220 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2221 else if (Ustrcmp(argrest, "es") == 0)
2223 msg_action = MSG_EDIT_SENDER;
2224 one_msg_action = TRUE;
2226 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2227 else if (Ustrcmp(argrest, "g") == 0)
2229 msg_action = MSG_DELIVER;
2230 deliver_give_up = TRUE;
2232 else if (Ustrcmp(argrest, "mad") == 0)
2234 msg_action = MSG_MARK_ALL_DELIVERED;
2236 else if (Ustrcmp(argrest, "md") == 0)
2238 msg_action = MSG_MARK_DELIVERED;
2239 one_msg_action = TRUE;
2241 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2242 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2243 else if (Ustrcmp(argrest, "vb") == 0)
2245 msg_action = MSG_SHOW_BODY;
2246 one_msg_action = TRUE;
2248 else if (Ustrcmp(argrest, "vh") == 0)
2250 msg_action = MSG_SHOW_HEADER;
2251 one_msg_action = TRUE;
2253 else if (Ustrcmp(argrest, "vl") == 0)
2255 msg_action = MSG_SHOW_LOG;
2256 one_msg_action = TRUE;
2258 else { badarg = TRUE; break; }
2260 /* All the -Mxx options require at least one message id. */
2262 msg_action_arg = i + 1;
2263 if (msg_action_arg >= argc)
2265 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2266 return EXIT_FAILURE;
2269 /* Some require only message ids to follow */
2271 if (!one_msg_action)
2274 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2276 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2278 return EXIT_FAILURE;
2280 goto END_ARG; /* Remaining args are ids */
2283 /* Others require only one message id, possibly followed by addresses,
2284 which will be handled as normal arguments. */
2288 if (!mac_ismsgid(argv[msg_action_arg]))
2290 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2291 argv[msg_action_arg], arg);
2292 return EXIT_FAILURE;
2299 /* Some programs seem to call the -om option without the leading o;
2300 for sendmail it askes for "me too". Exim always does this. */
2303 if (*argrest != 0) badarg = TRUE;
2307 /* -N: don't do delivery - a debugging option that stops transports doing
2308 their thing. It implies debugging at the D_v level. */
2313 dont_deliver = TRUE;
2314 debug_selector |= D_v;
2315 debug_file = stderr;
2321 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2327 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2328 option to the specified value. This form uses long names. We need to handle
2329 -O option=value and -Ooption=value. */
2336 fprintf(stderr, "exim: string expected after -O\n");
2344 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2347 if (*argrest == 'A')
2349 alias_arg = argrest + 1;
2350 if (alias_arg[0] == 0)
2352 if (i+1 < argc) alias_arg = argv[++i]; else
2354 fprintf(stderr, "exim: string expected after -oA\n");
2360 /* -oB: Set a connection message max value for remote deliveries */
2362 else if (*argrest == 'B')
2364 uschar *p = argrest + 1;
2367 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2369 connection_max_messages = 1;
2378 fprintf(stderr, "exim: number expected after -oB\n");
2381 connection_max_messages = Uatoi(p);
2385 /* -odb: background delivery */
2387 else if (Ustrcmp(argrest, "db") == 0)
2389 synchronous_delivery = FALSE;
2390 arg_queue_only = FALSE;
2391 queue_only_set = TRUE;
2394 /* -odf: foreground delivery (smail-compatible option); same effect as
2395 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2398 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2400 synchronous_delivery = TRUE;
2401 arg_queue_only = FALSE;
2402 queue_only_set = TRUE;
2405 /* -odq: queue only */
2407 else if (Ustrcmp(argrest, "dq") == 0)
2409 synchronous_delivery = FALSE;
2410 arg_queue_only = TRUE;
2411 queue_only_set = TRUE;
2414 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2415 but no remote delivery */
2417 else if (Ustrcmp(argrest, "dqs") == 0)
2420 arg_queue_only = FALSE;
2421 queue_only_set = TRUE;
2424 /* -oex: Sendmail error flags. As these are also accepted without the
2425 leading -o prefix, for compatibility with vacation and other callers,
2426 they are handled with -e above. */
2428 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2429 -oitrue: Another sendmail syntax for the same */
2431 else if (Ustrcmp(argrest, "i") == 0 ||
2432 Ustrcmp(argrest, "itrue") == 0)
2435 /* -oM*: Set various characteristics for an incoming message; actually
2436 acted on for trusted callers only. */
2438 else if (*argrest == 'M')
2442 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2446 /* -oMa: Set sender host address */
2448 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2450 /* -oMaa: Set authenticator name */
2452 else if (Ustrcmp(argrest, "Maa") == 0)
2453 sender_host_authenticated = argv[++i];
2455 /* -oMas: setting authenticated sender */
2457 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2459 /* -oMai: setting authenticated id */
2461 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2463 /* -oMi: Set incoming interface address */
2465 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2467 /* -oMr: Received protocol */
2469 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2471 /* -oMs: Set sender host name */
2473 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2475 /* -oMt: Set sender ident */
2477 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2479 /* Else a bad argument */
2488 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2489 seem to call this as -m (undocumented), so that is also accepted (see
2492 else if (Ustrcmp(argrest, "m") == 0) {}
2494 /* -oo: An ancient flag for old-style addresses which still seems to
2495 crop up in some calls (see in SCO). */
2497 else if (Ustrcmp(argrest, "o") == 0) {}
2499 /* -oP <name>: set pid file path for daemon */
2501 else if (Ustrcmp(argrest, "P") == 0)
2502 override_pid_file_path = argv[++i];
2504 /* -or <n>: set timeout for non-SMTP acceptance
2505 -os <n>: set timeout for SMTP acceptance */
2507 else if (*argrest == 'r' || *argrest == 's')
2509 int *tp = (*argrest == 'r')?
2510 &arg_receive_timeout : &arg_smtp_receive_timeout;
2511 if (argrest[1] == 0)
2513 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2515 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2518 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2523 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2525 else if (Ustrcmp(argrest, "X") == 0)
2526 override_local_interfaces = argv[++i];
2528 /* Unknown -o argument */
2534 /* -ps: force Perl startup; -pd force delayed Perl startup */
2538 if (*argrest == 's' && argrest[1] == 0)
2540 perl_start_option = 1;
2543 if (*argrest == 'd' && argrest[1] == 0)
2545 perl_start_option = -1;
2550 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2551 which sets the host protocol and host name */
2555 if (i+1 < argc) argrest = argv[++i]; else
2556 { badarg = TRUE; break; }
2561 uschar *hn = Ustrchr(argrest, ':');
2564 received_protocol = argrest;
2568 received_protocol = string_copyn(argrest, hn - argrest);
2569 sender_host_name = hn + 1;
2576 receiving_message = FALSE;
2578 /* -qq...: Do queue runs in a 2-stage manner */
2580 if (*argrest == 'q')
2582 queue_2stage = TRUE;
2586 /* -qi...: Do only first (initial) deliveries */
2588 if (*argrest == 'i')
2590 queue_run_first_delivery = TRUE;
2594 /* -qf...: Run the queue, forcing deliveries
2595 -qff..: Ditto, forcing thawing as well */
2597 if (*argrest == 'f')
2599 queue_run_force = TRUE;
2600 if (*(++argrest) == 'f')
2602 deliver_force_thaw = TRUE;
2607 /* -q[f][f]l...: Run the queue only on local deliveries */
2609 if (*argrest == 'l')
2611 queue_run_local = TRUE;
2615 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2616 optionally starting from a given message id. */
2618 if (*argrest == 0 &&
2619 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2622 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2623 start_queue_run_id = argv[++i];
2624 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2625 stop_queue_run_id = argv[++i];
2628 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2629 optionally local only. */
2634 queue_interval = readconf_readtime(argrest, 0, FALSE);
2636 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2637 if (queue_interval <= 0)
2639 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2646 case 'R': /* Synonymous with -qR... */
2647 receiving_message = FALSE;
2649 /* -Rf: As -R (below) but force all deliveries,
2650 -Rff: Ditto, but also thaw all frozen messages,
2651 -Rr: String is regex
2652 -Rrf: Regex and force
2653 -Rrff: Regex and force and thaw
2655 in all cases provided there are no further characters in this
2661 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2663 if (Ustrcmp(argrest, rsopts[i]) == 0)
2665 if (i != 2) queue_run_force = TRUE;
2666 if (i >= 2) deliver_selectstring_regex = TRUE;
2667 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2668 argrest += Ustrlen(rsopts[i]);
2673 /* -R: Set string to match in addresses for forced queue run to
2674 pick out particular messages. */
2678 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2680 fprintf(stderr, "exim: string expected after -R\n");
2684 else deliver_selectstring = argrest;
2685 if (queue_interval < 0) queue_interval = 0;
2689 /* -r: an obsolete synonym for -f (see above) */
2692 /* -S: Like -R but works on sender. */
2694 case 'S': /* Synonymous with -qS... */
2695 receiving_message = FALSE;
2697 /* -Sf: As -S (below) but force all deliveries,
2698 -Sff: Ditto, but also thaw all frozen messages,
2699 -Sr: String is regex
2700 -Srf: Regex and force
2701 -Srff: Regex and force and thaw
2703 in all cases provided there are no further characters in this
2709 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2711 if (Ustrcmp(argrest, rsopts[i]) == 0)
2713 if (i != 2) queue_run_force = TRUE;
2714 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2715 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2716 argrest += Ustrlen(rsopts[i]);
2721 /* -S: Set string to match in addresses for forced queue run to
2722 pick out particular messages. */
2726 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2728 fprintf(stderr, "exim: string expected after -S\n");
2732 else deliver_selectstring_sender = argrest;
2733 if (queue_interval < 0) queue_interval = 0;
2736 /* -Tqt is an option that is exclusively for use by the testing suite.
2737 It is not recognized in other circumstances. It allows for the setting up
2738 of explicit "queue times" so that various warning/retry things can be
2739 tested. Otherwise variability of clock ticks etc. cause problems. */
2742 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2743 fudged_queue_times = argv[++i];
2748 /* -t: Set flag to extract recipients from body of message. */
2751 if (*argrest == 0) extract_recipients = TRUE;
2753 /* -ti: Set flag to extract recipients from body of message, and also
2754 specify that dot does not end the message. */
2756 else if (Ustrcmp(argrest, "i") == 0)
2758 extract_recipients = TRUE;
2762 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2765 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2772 /* -U: This means "initial user submission" in sendmail, apparently. The
2773 doc claims that in future sendmail may refuse syntactically invalid
2774 messages instead of fixing them. For the moment, we just ignore it. */
2780 /* -v: verify things - this is a very low-level debugging */
2785 debug_selector |= D_v;
2786 debug_file = stderr;
2792 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2794 The -x flag tells the sendmail command that mail from a local
2795 mail program has National Language Support (NLS) extended characters
2796 in the body of the mail item. The sendmail command can send mail with
2797 extended NLS characters across networks that normally corrupts these
2800 As Exim is 8-bit clean, it just ignores this flag. */
2803 if (*argrest != 0) badarg = TRUE;
2806 /* All other initial characters are errors */
2811 } /* End of high-level switch statement */
2813 /* Failed to recognize the option, or syntax error */
2817 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2818 "option %s\n", arg);
2824 /* Arguments have been processed. Check for incompatibilities. */
2828 (smtp_input || extract_recipients || recipients_arg < argc) &&
2829 (daemon_listen || queue_interval >= 0 || bi_option ||
2830 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2831 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2834 msg_action_arg > 0 &&
2835 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2836 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2839 (daemon_listen || queue_interval >= 0) &&
2840 (sender_address != NULL || list_options || list_queue || checking ||
2844 daemon_listen && queue_interval == 0
2848 (checking || smtp_input || extract_recipients ||
2849 filter_test != FTEST_NONE || bi_option)
2852 verify_address_mode &&
2853 (address_test_mode || smtp_input || extract_recipients ||
2854 filter_test != FTEST_NONE || bi_option)
2857 address_test_mode && (smtp_input || extract_recipients ||
2858 filter_test != FTEST_NONE || bi_option)
2861 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2865 deliver_selectstring != NULL && queue_interval < 0
2869 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2873 /* If debugging is set up, set the file and the file descriptor to pass on to
2874 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2875 to run in the foreground. */
2877 if (debug_selector != 0)
2879 debug_file = stderr;
2880 debug_fd = fileno(debug_file);
2881 background_daemon = FALSE;
2882 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2883 if (debug_selector != D_v) /* -v only doesn't show this */
2885 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2886 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2888 show_whats_supported(stderr);
2892 /* When started with root privilege, ensure that the limits on the number of
2893 open files and the number of processes (where that is accessible) are
2894 sufficiently large, or are unset, in case Exim has been called from an
2895 environment where the limits are screwed down. Not all OS have the ability to
2896 change some of these limits. */
2900 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2906 #ifdef RLIMIT_NOFILE
2907 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2909 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2911 rlp.rlim_cur = rlp.rlim_max = 0;
2914 /* I originally chose 1000 as a nice big number that was unlikely to
2915 be exceeded. It turns out that some older OS have a fixed upper limit of
2918 if (rlp.rlim_cur < 1000)
2920 rlp.rlim_cur = rlp.rlim_max = 1000;
2921 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2923 rlp.rlim_cur = rlp.rlim_max = 256;
2924 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2925 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2932 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2934 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2936 rlp.rlim_cur = rlp.rlim_max = 0;
2939 #ifdef RLIM_INFINITY
2940 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2942 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2944 if (rlp.rlim_cur < 1000)
2946 rlp.rlim_cur = rlp.rlim_max = 1000;
2948 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2949 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2955 /* Exim is normally entered as root (but some special configurations are
2956 possible that don't do this). However, it always spins off sub-processes that
2957 set their uid and gid as required for local delivery. We don't want to pass on
2958 any extra groups that root may belong to, so we want to get rid of them all at
2961 We need to obey setgroups() at this stage, before possibly giving up root
2962 privilege for a changed configuration file, but later on we might need to
2963 check on the additional groups for the admin user privilege - can't do that
2964 till after reading the config, which might specify the exim gid. Therefore,
2965 save the group list here first. */
2967 group_count = getgroups(NGROUPS_MAX, group_list);
2969 /* There is a fundamental difference in some BSD systems in the matter of
2970 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2971 known not to be different. On the "different" systems there is a single group
2972 list, and the first entry in it is the current group. On all other versions of
2973 Unix there is a supplementary group list, which is in *addition* to the current
2974 group. Consequently, to get rid of all extraneous groups on a "standard" system
2975 you pass over 0 groups to setgroups(), while on a "different" system you pass
2976 over a single group - the current group, which is always the first group in the
2977 list. Calling setgroups() with zero groups on a "different" system results in
2978 an error return. The following code should cope with both types of system.
2980 However, if this process isn't running as root, setgroups() can't be used
2981 since you have to be root to run it, even if throwing away groups. Not being
2982 root here happens only in some unusual configurations. We just ignore the
2985 if (setgroups(0, NULL) != 0)
2987 if (setgroups(1, group_list) != 0 && !unprivileged)
2989 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2994 /* If the configuration file name has been altered by an argument on the
2995 command line (either a new file name or a macro definition) and the caller is
2996 not root or the exim user, or if this is a filter testing run, remove any
2997 setuid privilege the program has, and run as the underlying user.
2999 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3000 severely restricts the use of -C for some purposes.
3002 Otherwise, set the real ids to the effective values (should be root unless run
3003 from inetd, which it can either be root or the exim uid, if one is configured).
3005 There is a private mechanism for bypassing some of this, in order to make it
3006 possible to test lots of configurations automatically, without having either to
3007 recompile each time, or to patch in an actual configuration file name and other
3008 values (such as the path name). If running in the test harness, pretend that
3009 configuration file changes and macro definitions haven't happened. */
3012 (config_changed || macros != NULL) && /* Config changed, and */
3013 real_uid != root_uid && /* Not root, and */
3014 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3015 real_uid != exim_uid && /* Not exim, and */
3017 !running_in_test_harness /* Not fudged */
3019 expansion_test /* expansion testing */
3021 filter_test != FTEST_NONE) /* Filter testing */
3023 setgroups(group_count, group_list);
3024 exim_setugid(real_uid, real_gid, FALSE,
3025 US"-C, -D, -be or -bf forces real uid");
3026 removed_privilege = TRUE;
3028 /* In the normal case when Exim is called like this, stderr is available
3029 and should be used for any logging information because attempts to write
3030 to the log will usually fail. To arrange this, we unset really_exim. However,
3031 if no stderr is available there is no point - we might as well have a go
3032 at the log (if it fails, syslog will be written). */
3034 if (log_stderr != NULL) really_exim = FALSE;
3037 /* Privilege is to be retained for the moment. It may be dropped later,
3038 depending on the job that this Exim process has been asked to do. For now, set
3039 the real uid to the effective so that subsequent re-execs of Exim are done by a
3042 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3044 /* If testing a filter, open the file(s) now, before wasting time doing other
3045 setups and reading the message. */
3047 if ((filter_test & FTEST_SYSTEM) != 0)
3049 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3052 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3054 return EXIT_FAILURE;
3058 if ((filter_test & FTEST_USER) != 0)
3060 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3063 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3065 return EXIT_FAILURE;
3069 /* Read the main runtime configuration data; this gives up if there
3070 is a failure. It leaves the configuration file open so that the subsequent
3071 configuration data for delivery can be read if needed. */
3075 /* Handle the decoding of logging options. */
3077 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3078 log_options, log_options_count, US"log");
3082 debug_printf("configuration file is %s\n", config_main_filename);
3083 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3084 log_extra_selector);
3087 /* If domain literals are not allowed, check the sender address that was
3088 supplied with -f. Ditto for a stripped trailing dot. */
3090 if (sender_address != NULL)
3092 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3094 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3095 "allowed\n", sender_address);
3096 return EXIT_FAILURE;
3098 if (f_end_dot && !strip_trailing_dot)
3100 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3101 "(trailing dot not allowed)\n", sender_address);
3102 return EXIT_FAILURE;
3106 /* Paranoia check of maximum lengths of certain strings. There is a check
3107 on the length of the log file path in log.c, which will come into effect
3108 if there are any calls to write the log earlier than this. However, if we
3109 get this far but the string is very long, it is better to stop now than to
3110 carry on and (e.g.) receive a message and then have to collapse. The call to
3111 log_write() from here will cause the ultimate panic collapse if the complete
3112 file name exceeds the buffer length. */
3114 if (Ustrlen(log_file_path) > 200)
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3116 "log_file_path is longer than 200 chars: aborting");
3118 if (Ustrlen(pid_file_path) > 200)
3119 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3120 "pid_file_path is longer than 200 chars: aborting");
3122 if (Ustrlen(spool_directory) > 200)
3123 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3124 "spool_directory is longer than 200 chars: aborting");
3126 /* Length check on the process name given to syslog for its TAG field,
3127 which is only permitted to be 32 characters or less. See RFC 3164. */
3129 if (Ustrlen(syslog_processname) > 32)
3130 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3131 "syslog_processname is longer than 32 chars: aborting");
3133 /* In some operating systems, the environment variable TMPDIR controls where
3134 temporary files are created; Exim doesn't use these (apart from when delivering
3135 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3136 If TMPDIR is found in the environment, reset it to the value defined in the
3137 TMPDIR macro, if this macro is defined. */
3142 for (p = USS environ; *p != NULL; p++)
3144 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3145 Ustrcmp(*p+7, TMPDIR) != 0)
3147 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3148 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3150 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3156 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3157 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3158 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3159 called by a user who has set the TZ variable. This then affects the timestamps
3160 in log files and in Received: headers, and any created Date: header lines. The
3161 required timezone is settable in the configuration file, so nothing can be done
3162 about this earlier - but hopefully nothing will normally be logged earlier than
3163 this. We have to make a new environment if TZ is wrong, but don't bother if
3164 timestamps_utc is set, because then all times are in UTC anyway. */
3166 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3168 timestamps_utc = TRUE;
3172 uschar *envtz = US getenv("TZ");
3173 if ((envtz == NULL && timezone_string != NULL) ||
3175 (timezone_string == NULL ||
3176 Ustrcmp(timezone_string, envtz) != 0)))
3178 uschar **p = USS environ;
3182 while (*p++ != NULL) count++;
3183 if (envtz == NULL) count++;
3184 newp = new = malloc(sizeof(uschar *) * (count + 1));
3185 for (p = USS environ; *p != NULL; p++)
3187 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3190 if (timezone_string != NULL)
3192 *newp = malloc(Ustrlen(timezone_string) + 4);
3193 sprintf(CS *newp++, "TZ=%s", timezone_string);
3198 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3199 tod_stamp(tod_log));
3203 /* Handle the case when we have removed the setuid privilege because of -C or
3204 -D. This means that the caller of Exim was not root, and, provided that
3205 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3208 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3209 were running as the exim user defined in the configuration file (different to
3210 the one in the binary). The sysadmin may expect this case to retain privilege
3211 because "the binary was called by the Exim user", but it hasn't, because of the
3212 order in which it handles this stuff. There are two possibilities:
3214 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3215 to do message deliveries. Thus, the fact that it is running as a
3216 non-privileged user is plausible, and might be wanted in some special
3217 configurations. However, really_exim will have been set false when
3218 privilege was dropped, to stop Exim trying to write to its normal log
3219 files. Therefore, re-enable normal log processing, assuming the sysadmin
3220 has set up the log directory correctly.
3222 (2) If deliver_drop_privilege is not set, the configuration won't work as
3223 apparently intended, and so we log a panic message. In order to retain
3224 root for -C or -D, the caller must either be root or the Exim user
3225 defined in the binary (when deliver_drop_ privilege is false).
3227 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3228 built-in exim user or one defined in the configuration. In either event,
3229 re-enable log processing, assuming the sysadmin knows what they are doing. */
3231 if (removed_privilege && (config_changed || macros != NULL) &&
3232 real_uid == exim_uid)
3234 #ifdef ALT_CONFIG_ROOT_ONLY
3235 really_exim = TRUE; /* let logging work normally */
3238 if (deliver_drop_privilege)
3239 really_exim = TRUE; /* let logging work normally */
3241 log_write(0, LOG_MAIN|LOG_PANIC,
3242 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3243 (int)exim_uid, config_changed? "-C" : "-D");
3247 /* Start up Perl interpreter if Perl support is configured and there is a
3248 perl_startup option, and the configuration or the command line specifies
3249 initializing starting. Note that the global variables are actually called
3250 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3253 if (perl_start_option != 0)
3254 opt_perl_at_start = (perl_start_option > 0);
3255 if (opt_perl_at_start && opt_perl_startup != NULL)
3258 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3259 errstr = init_perl(opt_perl_startup);
3262 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3263 return EXIT_FAILURE;
3265 opt_perl_started = TRUE;
3267 #endif /* EXIM_PERL */
3269 /* Log the arguments of the call if the configuration file said so. This is
3270 a debugging feature for finding out what arguments certain MUAs actually use.
3271 Don't attempt it if logging is disabled, or if listing variables or if
3272 verifying/testing addresses or expansions. */
3274 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3275 && really_exim && !list_options && !checking)
3278 uschar *p = big_buffer;
3280 (void)getcwd(CS p+4, big_buffer_size - 4);
3282 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3284 for (i = 0; i < argc; i++)
3286 int len = Ustrlen(argv[i]);
3289 if (p + len + 8 >= big_buffer + big_buffer_size)
3292 log_write(0, LOG_MAIN, "%s", big_buffer);
3293 Ustrcpy(big_buffer, "...");
3296 printing = string_printing(argv[i]);
3297 if (printing[0] == 0) quote = US"\""; else
3299 uschar *pp = printing;
3301 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3303 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3304 (p - big_buffer) - 4), printing, quote);
3308 if ((log_extra_selector & LX_arguments) != 0)
3309 log_write(0, LOG_MAIN, "%s", big_buffer);
3311 debug_printf("%s\n", big_buffer);
3314 /* Set the working directory to be the top-level spool directory. We don't rely
3315 on this in the code, which always uses fully qualified names, but it's useful
3316 for core dumps etc. Don't complain if it fails - the spool directory might not
3317 be generally accessible and calls with the -C option (and others) have lost
3318 privilege by now. Before the chdir, we try to ensure that the directory exists.
3321 if (Uchdir(spool_directory) != 0)
3323 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3324 (void)Uchdir(spool_directory);
3327 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3328 alias file. Exim doesn't have such a concept, but this call is screwed into
3329 Sun's YP makefiles. Handle this by calling a configured script, as the real
3330 user who called Exim. The -oA option can be used to pass an argument to the
3335 (void)fclose(config_file);
3336 if (bi_command != NULL)
3340 argv[i++] = bi_command;
3341 if (alias_arg != NULL) argv[i++] = alias_arg;
3344 setgroups(group_count, group_list);
3345 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3347 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3348 (argv[1] == NULL)? US"" : argv[1]);
3350 execv(CS argv[0], (char *const *)argv);
3351 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3356 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3361 /* If an action on specific messages is requested, or if a daemon or queue
3362 runner is being started, we need to know if Exim was called by an admin user.
3363 This is the case if the real user is root or exim, or if the real group is
3364 exim, or if one of the supplementary groups is exim or a group listed in
3365 admin_groups. We don't fail all message actions immediately if not admin_user,
3366 since some actions can be performed by non-admin users. Instead, set admin_user
3367 for later interrogation. */
3369 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3375 for (i = 0; i < group_count; i++)
3377 if (group_list[i] == exim_gid) admin_user = TRUE;
3378 else if (admin_groups != NULL)
3380 for (j = 1; j <= (int)(admin_groups[0]); j++)
3381 if (admin_groups[j] == group_list[i])
3382 { admin_user = TRUE; break; }
3384 if (admin_user) break;
3388 /* Another group of privileged users are the trusted users. These are root,
3389 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3390 are permitted to specify sender_addresses with -f on the command line, and
3391 other message parameters as well. */
3393 if (real_uid == root_uid || real_uid == exim_uid)
3394 trusted_caller = TRUE;
3399 if (trusted_users != NULL)
3401 for (i = 1; i <= (int)(trusted_users[0]); i++)
3402 if (trusted_users[i] == real_uid)
3403 { trusted_caller = TRUE; break; }
3406 if (!trusted_caller && trusted_groups != NULL)
3408 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3410 if (trusted_groups[i] == real_gid)
3411 trusted_caller = TRUE;
3412 else for (j = 0; j < group_count; j++)
3414 if (trusted_groups[i] == group_list[j])
3415 { trusted_caller = TRUE; break; }
3417 if (trusted_caller) break;
3422 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3423 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3425 /* Only an admin user may start the daemon or force a queue run in the default
3426 configuration, but the queue run restriction can be relaxed. Only an admin
3427 user may request that a message be returned to its sender forthwith. Only an
3428 admin user may specify a debug level greater than D_v (because it might show
3429 passwords, etc. in lookup queries). Only an admin user may request a queue
3434 BOOL debugset = (debug_selector & ~D_v) != 0;
3435 if (deliver_give_up || daemon_listen ||
3436 (count_queue && queue_list_requires_admin) ||
3437 (list_queue && queue_list_requires_admin) ||
3438 (queue_interval >= 0 && prod_requires_admin) ||
3439 (debugset && !running_in_test_harness))
3441 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3446 /* If the real user is not root or the exim uid, the argument for passing
3447 in an open TCP/IP connection for another message is not permitted, nor is
3448 running with the -N option for any delivery action, unless this call to exim is
3449 one that supplied an input message, or we are using a patched exim for
3450 regression testing. */
3452 if (real_uid != root_uid && real_uid != exim_uid &&
3453 (continue_hostname != NULL ||
3455 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3456 )) && !running_in_test_harness)
3458 fprintf(stderr, "exim: Permission denied\n");
3459 return EXIT_FAILURE;
3462 /* If the caller is not trusted, certain arguments are ignored when running for
3463 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3464 Note that authority for performing certain actions on messages is tested in the
3465 queue_action() function. */
3467 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3469 sender_host_name = sender_host_address = interface_address =
3470 sender_ident = received_protocol = NULL;
3471 sender_host_port = interface_port = 0;
3472 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3475 /* If a sender host address is set, extract the optional port number off the
3476 end of it and check its syntax. Do the same thing for the interface address.
3477 Exim exits if the syntax is bad. */
3481 if (sender_host_address != NULL)
3482 sender_host_port = check_port(sender_host_address);
3483 if (interface_address != NULL)
3484 interface_port = check_port(interface_address);
3487 /* If an SMTP message is being received check to see if the standard input is a
3488 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3489 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3494 union sockaddr_46 inetd_sock;
3495 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3496 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3498 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3499 if (family == AF_INET || family == AF_INET6)
3501 union sockaddr_46 interface_sock;
3502 size = sizeof(interface_sock);
3504 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3505 interface_address = host_ntoa(-1, &interface_sock, NULL,
3508 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3510 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3513 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3514 NULL, &sender_host_port);
3515 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3516 "inetd is not supported when mua_wrapper is set");
3521 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3522 return EXIT_FAILURE;
3528 /* If the load average is going to be needed while receiving a message, get it
3529 now for those OS that require the first call to os_getloadavg() to be done as
3530 root. There will be further calls later for each message received. */
3532 #ifdef LOAD_AVG_NEEDS_ROOT
3533 if (receiving_message &&
3534 (queue_only_load >= 0 ||
3535 (is_inetd && smtp_load_reserve >= 0)
3538 load_average = os_getloadavg();
3542 /* The queue_only configuration option can be overridden by -odx on the command
3543 line, except that if queue_only_override is false, queue_only cannot be unset
3544 from the command line. */
3546 if (queue_only_set && (queue_only_override || arg_queue_only))
3547 queue_only = arg_queue_only;
3549 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3552 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3553 if (arg_smtp_receive_timeout >= 0)
3554 smtp_receive_timeout = arg_smtp_receive_timeout;
3556 /* If Exim was started with root privilege, unless we have already removed the
3557 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3558 except when starting the daemon or doing some kind of delivery or address
3559 testing (-bt). These are the only cases when root need to be retained. We run
3560 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3561 retained only for starting the daemon. */
3563 if (!unprivileged && /* originally had root AND */
3564 !removed_privilege && /* still got root AND */
3565 !daemon_listen && /* not starting the daemon */
3566 queue_interval <= 0 && /* (either kind of daemon) */
3568 deliver_drop_privilege || /* requested unprivileged */
3570 queue_interval < 0 && /* not running the queue */
3571 (msg_action_arg < 0 || /* and */
3572 msg_action != MSG_DELIVER) && /* not delivering and */
3573 (!checking || !address_test_mode) /* not address checking */
3577 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3580 /* When we are retaining a privileged uid, we still change to the exim gid. */
3582 else setgid(exim_gid);
3584 /* Handle a request to list the delivery queue */
3588 set_process_info("listing the queue");
3589 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3593 /* Handle a request to count the delivery queue */
3597 set_process_info("counting the queue");
3602 /* Handle actions on specific messages, except for the force delivery action,
3603 which is done below. Some actions take a whole list of message ids, which
3604 are known to continue up to the end of the arguments. Others take a single
3605 message id and then operate on the recipients list. */
3607 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3609 int yield = EXIT_SUCCESS;
3610 set_process_info("acting on specified messages");
3612 if (!one_msg_action)
3614 for (i = msg_action_arg; i < argc; i++)
3615 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3616 yield = EXIT_FAILURE;
3619 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3620 recipients_arg)) yield = EXIT_FAILURE;
3624 /* All the modes below here require the remaining configuration sections
3625 to be read, except that we can skip over the ACL setting when delivering
3626 specific messages, or doing a queue run. (For various testing cases we could
3627 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3630 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3632 /* The configuration data will have been read into POOL_PERM because we won't
3633 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3634 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3635 configuration were read into POOL_MAIN, because we don't do any resets till
3636 later on. However, it seems right, and it does ensure that both pools get used.
3639 store_pool = POOL_MAIN;
3641 /* Handle the -brt option. This is for checking out retry configurations.
3642 The next three arguments are a domain name or a complete address, and
3643 optionally two error numbers. All it does is to call the function that
3644 scans the retry configuration data. */
3646 if (test_retry_arg >= 0)
3648 retry_config *yield;
3649 int basic_errno = 0;
3653 if (test_retry_arg >= argc)
3655 printf("-brt needs a domain or address argument\n");
3656 exim_exit(EXIT_FAILURE);
3658 s1 = argv[test_retry_arg++];
3661 /* If the first argument contains no @ and no . it might be a local user
3662 or it might be a single-component name. Treat as a domain. */
3664 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3666 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3667 "being \ntreated as a one-component domain, not as a local part.\n\n",
3671 /* There may be an optional second domain arg. */
3673 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3674 s2 = argv[test_retry_arg++];
3676 /* The final arg is an error name */
3678 if (test_retry_arg < argc)
3680 uschar *ss = argv[test_retry_arg];
3682 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3685 printf("%s\n", CS error);
3686 return EXIT_FAILURE;
3689 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3690 an error is for matching codes to the decade. Turn them into a real error
3691 code, off the decade. */
3693 if (basic_errno == ERRNO_RCPT4XX)
3695 int code = (more_errno >> 8) & 255;
3697 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3698 else if (code > 100)
3699 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3703 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3704 if (yield == NULL) printf("No retry information found\n"); else
3707 more_errno = yield->more_errno;
3708 printf("Retry rule: %s ", yield->pattern);
3710 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3712 printf("quota%s%s ",
3713 (more_errno > 0)? "_" : "",
3714 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3716 else if (yield->basic_errno == ECONNREFUSED)
3718 printf("refused%s%s ",
3719 (more_errno > 0)? "_" : "",
3720 (more_errno == 'M')? "MX" :
3721 (more_errno == 'A')? "A" : "");
3723 else if (yield->basic_errno == ETIMEDOUT)
3726 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3728 if (more_errno != 0) printf("_%s",
3729 (more_errno == 'M')? "MX" : "A");
3732 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3733 printf("auth_failed ");
3736 for (r = yield->rules; r != NULL; r = r->next)
3738 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3739 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3745 printf(",%d.", x/1000);
3759 exim_exit(EXIT_SUCCESS);
3762 /* Handle a request to list one or more configuration options */
3766 set_process_info("listing variables");
3767 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3768 else for (i = recipients_arg; i < argc; i++)
3771 (Ustrcmp(argv[i], "router") == 0 ||
3772 Ustrcmp(argv[i], "transport") == 0 ||
3773 Ustrcmp(argv[i], "authenticator") == 0))
3775 readconf_print(argv[i+1], argv[i]);
3778 else readconf_print(argv[i], NULL);
3780 exim_exit(EXIT_SUCCESS);
3784 /* Handle a request to deliver one or more messages that are already on the
3785 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3786 is typically used for a small number when prodding by hand (when the option
3787 forced_delivery will be set) or when re-execing to regain root privilege.
3788 Each message delivery must happen in a separate process, so we fork a process
3789 for each one, and run them sequentially so that debugging output doesn't get
3790 intertwined, and to avoid spawning too many processes if a long list is given.
3791 However, don't fork for the last one; this saves a process in the common case
3792 when Exim is called to deliver just one message. */
3794 if (msg_action_arg > 0)
3796 if (prod_requires_admin && !admin_user)
3798 fprintf(stderr, "exim: Permission denied\n");
3799 exim_exit(EXIT_FAILURE);
3801 set_process_info("delivering specified messages");
3802 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3803 for (i = msg_action_arg; i < argc; i++)
3808 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3809 else if ((pid = fork()) == 0)
3811 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3812 _exit(EXIT_SUCCESS);
3816 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3818 exim_exit(EXIT_FAILURE);
3822 exim_exit(EXIT_SUCCESS);
3826 /* If only a single queue run is requested, without SMTP listening, we can just
3827 turn into a queue runner, with an optional starting message id. */
3829 if (queue_interval == 0 && !daemon_listen)
3831 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3832 (start_queue_run_id == NULL)? US"" : US" starting at ",
3833 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3834 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3835 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3836 set_process_info("running the queue (single queue run)");
3837 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3838 exim_exit(EXIT_SUCCESS);
3842 /* Find the login name of the real user running this process. This is always
3843 needed when receiving a message, because it is written into the spool file. It
3844 may also be used to construct a from: or a sender: header, and in this case we
3845 need the user's full name as well, so save a copy of it, checked for RFC822
3846 syntax and munged if necessary, if it hasn't previously been set by the -F
3847 argument. We may try to get the passwd entry more than once, in case NIS or
3848 other delays are in evidence. Save the home directory for use in filter testing
3853 if ((pw = getpwuid(real_uid)) != NULL)
3855 originator_login = string_copy(US pw->pw_name);
3856 originator_home = string_copy(US pw->pw_dir);
3858 /* If user name has not been set by -F, set it from the passwd entry
3859 unless -f has been used to set the sender address by a trusted user. */
3861 if (originator_name == NULL)
3863 if (sender_address == NULL ||
3864 (!trusted_caller && filter_test == FTEST_NONE))
3866 uschar *name = US pw->pw_gecos;
3867 uschar *amp = Ustrchr(name, '&');
3870 /* Most Unix specify that a '&' character in the gecos field is
3871 replaced by a copy of the login name, and some even specify that
3872 the first character should be upper cased, so that's what we do. */
3877 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3878 amp - name, name, &loffset, originator_login, amp + 1);
3879 buffer[loffset] = toupper(buffer[loffset]);
3883 /* If a pattern for matching the gecos field was supplied, apply
3884 it and then expand the name string. */
3886 if (gecos_pattern != NULL && gecos_name != NULL)
3889 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3891 if (regex_match_and_setup(re, name, 0, -1))
3893 uschar *new_name = expand_string(gecos_name);
3895 if (new_name != NULL)
3897 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3898 "gecos field \"%s\"\n", new_name, name);
3901 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3902 "\"%s\": %s\n", gecos_name, expand_string_message);
3904 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3905 "gecos field \"%s\"\n", gecos_pattern, name);
3906 store_free((void *)re);
3908 originator_name = string_copy(name);
3911 /* A trusted caller has used -f but not -F */
3913 else originator_name = US"";
3916 /* Break the retry loop */
3921 if (++i > finduser_retries) break;
3925 /* If we cannot get a user login, log the incident and give up, unless the
3926 configuration specifies something to use. When running in the test harness,
3927 any setting of unknown_login overrides the actual name. */
3929 if (originator_login == NULL || running_in_test_harness)
3931 if (unknown_login != NULL)
3933 originator_login = expand_string(unknown_login);
3934 if (originator_name == NULL && unknown_username != NULL)
3935 originator_name = expand_string(unknown_username);
3936 if (originator_name == NULL) originator_name = US"";
3938 if (originator_login == NULL)
3939 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3943 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3946 originator_name = string_copy(parse_fix_phrase(originator_name,
3947 Ustrlen(originator_name), big_buffer, big_buffer_size));
3949 /* If a message is created by this call of Exim, the uid/gid of its originator
3950 are those of the caller. These values are overridden if an existing message is
3951 read in from the spool. */
3953 originator_uid = real_uid;
3954 originator_gid = real_gid;
3956 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3957 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3959 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3960 returns. We leave this till here so that the originator_ fields are available
3961 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3964 if (daemon_listen || queue_interval > 0)
3968 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3969 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3970 "mua_wrapper is set");
3975 /* If the sender ident has not been set (by a trusted caller) set it to
3976 the caller. This will get overwritten below for an inetd call. If a trusted
3977 caller has set it empty, unset it. */
3979 if (sender_ident == NULL) sender_ident = originator_login;
3980 else if (sender_ident[0] == 0) sender_ident = NULL;
3982 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3983 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3984 originator_* variables set. */
3986 if (test_rewrite_arg >= 0)
3988 really_exim = FALSE;
3989 if (test_rewrite_arg >= argc)
3991 printf("-brw needs an address argument\n");
3992 exim_exit(EXIT_FAILURE);
3994 rewrite_test(argv[test_rewrite_arg]);
3995 exim_exit(EXIT_SUCCESS);
3998 /* A locally-supplied message is considered to be coming from a local user
3999 unless a trusted caller supplies a sender address with -f, or is passing in the
4000 message via SMTP (inetd invocation or otherwise). */
4002 if ((sender_address == NULL && !smtp_input) ||
4003 (!trusted_caller && filter_test == FTEST_NONE))
4005 sender_local = TRUE;
4007 /* A trusted caller can supply authenticated_sender and authenticated_id
4008 via -oMas and -oMai and if so, they will already be set. */
4010 if (authenticated_sender == NULL)
4011 authenticated_sender = string_sprintf("%s@%s", originator_login,
4012 qualify_domain_sender);
4013 if (authenticated_id == NULL) authenticated_id = originator_login;
4016 /* Trusted callers are always permitted to specify the sender address.
4017 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4018 is specified is the empty address. However, if a trusted caller does not
4019 specify a sender address for SMTP input, we leave sender_address unset. This
4020 causes the MAIL commands to be honoured. */
4022 if ((!smtp_input && sender_address == NULL) ||
4023 !receive_check_set_sender(sender_address))
4025 /* Either the caller is not permitted to set a general sender, or this is
4026 non-SMTP input and the trusted caller has not set a sender. If there is no
4027 sender, or if a sender other than <> is set, override with the originator's
4028 login (which will get qualified below), except when checking things. */
4030 if (sender_address == NULL /* No sender_address set */
4032 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4033 !checking && /* Not running tests, AND */
4034 filter_test == FTEST_NONE)) /* Not testing a filter */
4036 sender_address = originator_login;
4037 sender_address_forced = FALSE;
4038 sender_address_domain = 0;
4042 /* Remember whether an untrusted caller set the sender address */
4044 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4046 /* Ensure that the sender address is fully qualified unless it is the empty
4047 address, which indicates an error message, or doesn't exist (root caller, smtp
4048 interface, no -f argument). */
4050 if (sender_address != NULL && sender_address[0] != 0 &&
4051 sender_address_domain == 0)
4052 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4053 qualify_domain_sender);
4055 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4057 /* Handle a request to verify a list of addresses, or test them for delivery.
4058 This must follow the setting of the sender address, since routers can be
4059 predicated upon the sender. If no arguments are given, read addresses from
4060 stdin. Set debug_level to at least D_v to get full output for address testing.
4063 if (verify_address_mode || address_test_mode)
4066 int flags = vopt_qualify;
4068 if (verify_address_mode)
4070 if (!verify_as_sender) flags |= vopt_is_recipient;
4071 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4076 flags |= vopt_is_recipient;
4077 debug_selector |= D_v;
4078 debug_file = stderr;
4079 debug_fd = fileno(debug_file);
4080 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4083 if (recipients_arg < argc)
4085 while (recipients_arg < argc)
4087 uschar *s = argv[recipients_arg++];
4090 BOOL finished = FALSE;
4091 uschar *ss = parse_find_address_end(s, FALSE);
4092 if (*ss == ',') *ss = 0; else finished = TRUE;
4093 test_address(s, flags, &exit_value);
4096 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4103 uschar *s = get_stdinput(NULL, NULL);
4104 if (s == NULL) break;
4105 test_address(s, flags, &exit_value);
4109 exim_exit(exit_value);
4112 /* Handle expansion checking */
4116 if (recipients_arg < argc)
4118 while (recipients_arg < argc)
4120 uschar *s = argv[recipients_arg++];
4121 uschar *ss = expand_string(s);
4123 printf ("Failed: %s\n", expand_string_message);
4124 else printf("%s\n", CS ss);
4132 char *(*fn_readline)(char *) = NULL;
4133 char *(*fn_addhist)(char *) = NULL;
4136 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4142 uschar *source = get_stdinput(fn_readline, fn_addhist);
4143 if (source == NULL) break;
4144 ss = expand_string(source);
4146 printf ("Failed: %s\n", expand_string_message);
4147 else printf("%s\n", CS ss);
4151 if (dlhandle != NULL) dlclose(dlhandle);
4155 exim_exit(EXIT_SUCCESS);
4159 /* The active host name is normally the primary host name, but it can be varied
4160 for hosts that want to play several parts at once. We need to ensure that it is
4161 set for host checking, and for receiving messages. */
4163 smtp_active_hostname = primary_hostname;
4164 if (raw_active_hostname != NULL)
4166 uschar *nah = expand_string(raw_active_hostname);
4169 if (!expand_string_forcedfail)
4170 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4171 "(smtp_active_hostname): %s", raw_active_hostname,
4172 expand_string_message);
4174 else if (nah[0] != 0) smtp_active_hostname = nah;
4177 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4178 given IP address so that the blocking and relay configuration can be tested. An
4179 RFC 1413 call is made only if we are running in the test harness and an
4180 incoming interface and both ports are specified, because there is no TCP/IP
4181 call to find the ident for. */
4188 sender_ident = NULL;
4189 if (running_in_test_harness && sender_host_port != 0 &&
4190 interface_address != NULL && interface_port != 0)
4191 verify_get_ident(1413);
4193 /* In case the given address is a non-canonical IPv6 address, canonicize
4194 it. The code works for both IPv4 and IPv6, as it happens. */
4196 size = host_aton(sender_host_address, x);
4197 sender_host_address = store_get(48); /* large enough for full IPv6 */
4198 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4200 /* Now set up for testing */
4202 host_build_sender_fullhost();
4206 sender_local = FALSE;
4207 sender_host_notsocket = TRUE;
4208 debug_file = stderr;
4209 debug_fd = fileno(debug_file);
4210 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4211 "**** but without any ident (RFC 1413) callback.\n"
4212 "**** This is not for real!\n\n",
4213 sender_host_address);
4215 if (verify_check_host(&hosts_connection_nolog) == OK)
4216 log_write_selector &= ~L_smtp_connection;
4217 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4219 if (smtp_start_session())
4221 reset_point = store_get(0);
4224 store_reset(reset_point);
4225 if (smtp_setup_msg() <= 0) break;
4226 if (!receive_msg(FALSE)) break;
4229 exim_exit(EXIT_SUCCESS);
4233 /* Arrange for message reception if recipients or SMTP were specified;
4234 otherwise complain unless a version print (-bV) happened or this is a filter
4235 verification test. In the former case, show the configuration file name. */
4237 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4239 if (version_printed)
4241 printf("Configuration file is %s\n", config_main_filename);
4242 return EXIT_SUCCESS;
4244 if (filter_test == FTEST_NONE)
4247 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4248 "not directly from a shell command line. Options and/or arguments control\n"
4249 "what it does when called. For a list of options, see the Exim documentation.\n");
4250 return EXIT_FAILURE;
4255 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4256 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4257 that we are not called from inetd, because that is rejected above. The
4258 following configuration settings are forced here:
4260 (1) Synchronous delivery (-odi)
4261 (2) Errors to stderr (-oep == -oeq)
4262 (3) No parallel remote delivery
4263 (4) Unprivileged delivery
4265 We don't force overall queueing options because there are several of them;
4266 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4267 to override any SMTP queueing. */
4271 synchronous_delivery = TRUE;
4272 arg_error_handling = ERRORS_STDERR;
4273 remote_max_parallel = 1;
4274 deliver_drop_privilege = TRUE;
4276 queue_smtp_domains = NULL;
4280 /* Prepare to accept one or more new messages on the standard input. When a
4281 message has been read, its id is returned in message_id[]. If doing immediate
4282 delivery, we fork a delivery process for each received message, except for the
4283 last one, where we can save a process switch.
4285 It is only in non-smtp mode that error_handling is allowed to be changed from
4286 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4287 sendmail error modes other than -oem ever actually used? Later: yes.) */
4289 if (!smtp_input) error_handling = arg_error_handling;
4291 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4292 logging being sent down the socket and make an identd call to get the
4297 (void)fclose(stderr);
4298 exim_nullstd(); /* Re-open to /dev/null */
4299 verify_get_ident(IDENT_PORT);
4300 host_build_sender_fullhost();
4301 set_process_info("handling incoming connection from %s via inetd",
4305 /* If the sender host address has been set, build sender_fullhost if it hasn't
4306 already been done (which it will have been for inetd). This caters for the
4307 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4308 so that the test for IP options is skipped for -bs input. */
4310 if (sender_host_address != NULL && sender_fullhost == NULL)
4312 host_build_sender_fullhost();
4313 set_process_info("handling incoming connection from %s via -oMa",
4315 sender_host_notsocket = TRUE;
4318 /* Otherwise, set the sender host as unknown except for inetd calls. This
4319 prevents host checking in the case of -bs not from inetd and also for -bS. */
4321 else if (!is_inetd) sender_host_unknown = TRUE;
4323 /* If stdout does not exist, then dup stdin to stdout. This can happen
4324 if exim is started from inetd. In this case fd 0 will be set to the socket,
4325 but fd 1 will not be set. This also happens for passed SMTP channels. */
4327 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4329 /* Set up the incoming protocol name and the state of the program. Root
4330 is allowed to force received protocol via the -oMr option above, and if we are
4331 in a non-local SMTP state it means we have come via inetd and the process info
4332 has already been set up. We don't set received_protocol here for smtp input,
4333 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4337 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4342 if (received_protocol == NULL)
4343 received_protocol = string_sprintf("local%s", called_as);
4344 set_process_info("accepting a local non-SMTP message from <%s>",
4348 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4352 local_queue_only = queue_only;
4354 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4355 the spool if so configured. On failure, we must not attempt to send an error
4356 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4357 error code is given.) */
4359 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4361 fprintf(stderr, "exim: insufficient disk space\n");
4362 return EXIT_FAILURE;
4365 /* If this is smtp input of any kind, handle the start of the SMTP
4372 if (verify_check_host(&hosts_connection_nolog) == OK)
4373 log_write_selector &= ~L_smtp_connection;
4374 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4375 if (!smtp_start_session())
4378 exim_exit(EXIT_SUCCESS);
4382 /* Otherwise, set up the input size limit here */
4386 thismessage_size_limit = expand_string_integer(message_size_limit);
4387 if (thismessage_size_limit < 0)
4389 if (thismessage_size_limit == -1)
4390 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4391 "message_size_limit: %s", expand_string_message);
4393 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4394 "message_size_limit: %s", expand_string_message);
4398 /* Loop for several messages when reading SMTP input. If we fork any child
4399 processes, we don't want to wait for them unless synchronous delivery is
4400 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4401 same as SIG_DFL, despite the fact that documentation often lists the default as
4402 "ignore". This is a confusing area. This is what I know:
4404 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4405 processes that complete simply to go away without ever becoming defunct. You
4406 can't then wait for them - but we don't want to wait for them in the
4407 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4408 happen for all OS (e.g. *BSD is different).
4410 But that's not the end of the story. Some (many? all?) systems have the
4411 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4412 has by default, so it seems that the difference is merely one of default
4413 (compare restarting vs non-restarting signals).
4415 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4416 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4417 of the loop below. Paranoia rules.
4419 February 2003: That's *still* not the end of the story. There are now versions
4420 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4421 process then calls waitpid(), a grumble is written to the system log, because
4422 this is logically inconsistent. In other words, it doesn't like the paranoia.
4423 As a consequenc of this, the waitpid() below is now excluded if we are sure
4424 that SIG_IGN works. */
4426 if (!synchronous_delivery)
4429 struct sigaction act;
4430 act.sa_handler = SIG_IGN;
4431 sigemptyset(&(act.sa_mask));
4432 act.sa_flags = SA_NOCLDWAIT;
4433 sigaction(SIGCHLD, &act, NULL);
4435 signal(SIGCHLD, SIG_IGN);
4439 /* Save the current store pool point, for resetting at the start of
4440 each message, and save the real sender address, if any. */
4442 reset_point = store_get(0);
4443 real_sender_address = sender_address;
4445 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4446 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4451 store_reset(reset_point);
4454 /* In the SMTP case, we have to handle the initial SMTP input and build the
4455 recipients list, before calling receive_msg() to read the message proper.
4456 Whatever sender address is actually given in the SMTP transaction is
4457 actually ignored for local senders - we use the actual sender, which is
4458 normally either the underlying user running this process or a -f argument
4459 provided by a trusted caller. It is saved in real_sender_address.
4461 However, if this value is NULL, we are dealing with a trusted caller when
4462 -f was not used; in this case, the SMTP sender is allowed to stand.
4464 Also, if untrusted_set_sender is set, we permit sender addresses that match
4465 anything in its list.
4467 The variable raw_sender_address holds the sender address before rewriting. */
4472 if ((rc = smtp_setup_msg()) > 0)
4474 if (real_sender_address != NULL &&
4475 !receive_check_set_sender(sender_address))
4477 sender_address = raw_sender = real_sender_address;
4478 sender_address_unrewritten = NULL;
4480 more = receive_msg(extract_recipients);
4481 if (message_id[0] == 0)
4484 exim_exit(EXIT_FAILURE);
4487 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4490 /* In the non-SMTP case, we have all the information from the command
4491 line, but must process it in case it is in the more general RFC822
4492 format, and in any case, to detect syntax errors. Also, it appears that
4493 the use of comma-separated lists as single arguments is common, so we
4494 had better support them. */
4500 int count = argc - recipients_arg;
4501 uschar **list = argv + recipients_arg;
4503 /* These options cannot be changed dynamically for non-SMTP messages */
4505 active_local_sender_retain = local_sender_retain;
4506 active_local_from_check = local_from_check;
4508 /* Save before any rewriting */
4510 raw_sender = string_copy(sender_address);
4512 /* Loop for each argument */
4514 for (i = 0; i < count; i++)
4516 int start, end, domain;
4518 uschar *s = list[i];
4520 /* Loop for each comma-separated address */
4524 BOOL finished = FALSE;
4526 uschar *ss = parse_find_address_end(s, FALSE);
4528 if (*ss == ',') *ss = 0; else finished = TRUE;
4530 /* Check max recipients - if -t was used, these aren't recipients */
4532 if (recipients_max > 0 && ++rcount > recipients_max &&
4533 !extract_recipients)
4535 if (error_handling == ERRORS_STDERR)
4537 fprintf(stderr, "exim: too many recipients\n");
4538 exim_exit(EXIT_FAILURE);
4543 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4544 errors_sender_rc : EXIT_FAILURE;
4549 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4551 if (domain == 0 && !allow_unqualified_recipient)
4554 errmess = US"unqualified recipient address not allowed";
4557 if (recipient == NULL)
4559 if (error_handling == ERRORS_STDERR)
4561 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4562 string_printing(list[i]), errmess);
4563 exim_exit(EXIT_FAILURE);
4569 eblock.text1 = string_printing(list[i]);
4570 eblock.text2 = errmess;
4572 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4573 errors_sender_rc : EXIT_FAILURE;
4577 receive_add_recipient(recipient, -1);
4580 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4584 /* Show the recipients when debugging */
4589 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4590 if (recipients_list != NULL)
4592 debug_printf("Recipients:\n");
4593 for (i = 0; i < recipients_count; i++)
4594 debug_printf(" %s\n", recipients_list[i].address);
4598 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4599 will just read the headers for the message, and not write anything onto the
4602 message_ended = END_NOTENDED;
4603 more = receive_msg(extract_recipients);
4605 /* more is always FALSE here (not SMTP message) when reading a message
4606 for real; when reading the headers of a message for filter testing,
4607 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4609 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4610 } /* Non-SMTP message reception */
4612 /* If this is a filter testing run, there are headers in store, but
4613 no message on the spool. Run the filtering code in testing mode, setting
4614 the domain to the qualify domain and the local part to the current user,
4615 unless they have been set by options. The prefix and suffix are left unset
4616 unless specified. The the return path is set to to the sender unless it has
4617 already been set from a return-path header in the message. */
4619 if (filter_test != FTEST_NONE)
4621 deliver_domain = (ftest_domain != NULL)?
4622 ftest_domain : qualify_domain_recipient;
4623 deliver_domain_orig = deliver_domain;
4624 deliver_localpart = (ftest_localpart != NULL)?
4625 ftest_localpart : originator_login;
4626 deliver_localpart_orig = deliver_localpart;
4627 deliver_localpart_prefix = ftest_prefix;
4628 deliver_localpart_suffix = ftest_suffix;
4629 deliver_home = originator_home;
4631 if (return_path == NULL)
4633 printf("Return-path copied from sender\n");
4634 return_path = string_copy(sender_address);
4638 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4640 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4642 receive_add_recipient(
4643 string_sprintf("%s%s%s@%s",
4644 (ftest_prefix == NULL)? US"" : ftest_prefix,
4646 (ftest_suffix == NULL)? US"" : ftest_suffix,
4647 deliver_domain), -1);
4649 printf("Recipient = %s\n", recipients_list[0].address);
4650 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4651 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4653 (void)chdir("/"); /* Get away from wherever the user is running this from */
4655 /* Now we run either a system filter test, or a user filter test, or both.
4656 In the latter case, headers added by the system filter will persist and be
4657 available to the user filter. We need to copy the filter variables
4660 if ((filter_test & FTEST_SYSTEM) != 0)
4662 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4663 exim_exit(EXIT_FAILURE);
4666 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4668 if ((filter_test & FTEST_USER) != 0)
4670 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4671 exim_exit(EXIT_FAILURE);
4674 exim_exit(EXIT_SUCCESS);
4677 /* Else act on the result of message reception. We should not get here unless
4678 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4679 TRUE. If it is not, check on the number of messages received in this
4680 connection. If that's OK and queue_only_load is set, check that the load
4681 average is below it. If it is not, set local_queue_only TRUE. Note that it
4682 then remains this way for any subsequent messages on the same SMTP connection.
4683 This is a deliberate choice; even though the load average may fall, it
4684 doesn't seem right to deliver later messages on the same call when not
4685 delivering earlier ones. */
4687 if (!local_queue_only)
4689 if (smtp_accept_queue_per_connection > 0 &&
4690 receive_messagecount > smtp_accept_queue_per_connection)
4692 local_queue_only = TRUE;
4693 queue_only_reason = 2;
4695 else if (queue_only_load >= 0)
4697 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4698 if (local_queue_only) queue_only_reason = 3;
4702 /* If running as an MUA wrapper, all queueing options and freezing options
4706 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4708 /* Log the queueing here, when it will get a message id attached, but
4709 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4712 if (local_queue_only) switch(queue_only_reason)
4715 log_write(L_delay_delivery,
4716 LOG_MAIN, "no immediate delivery: more than %d messages "
4717 "received in one connection", smtp_accept_queue_per_connection);
4721 log_write(L_delay_delivery,
4722 LOG_MAIN, "no immediate delivery: load average %.2f",
4723 (double)load_average/1000.0);
4727 /* Else do the delivery unless the ACL or local_scan() called for queue only
4728 or froze the message. Always deliver in a separate process. A fork failure is
4729 not a disaster, as the delivery will eventually happen on a subsequent queue
4730 run. The search cache must be tidied before the fork, as the parent will
4731 do it before exiting. The child will trigger a lookup failure and
4732 thereby defer the delivery if it tries to use (for example) a cached ldap
4733 connection that the parent has called unbind on. */
4735 else if (!queue_only_policy && !deliver_freeze)
4740 if ((pid = fork()) == 0)
4743 close_unwanted(); /* Close unwanted file descriptors and TLS */
4744 exim_nullstd(); /* Ensure std{in,out,err} exist */
4746 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4747 mode, deliver_drop_privilege is forced TRUE). */
4749 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4751 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4753 /* Control does not return here. */
4756 /* No need to re-exec */
4758 rc = deliver_message(message_id, FALSE, FALSE);
4760 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4761 EXIT_SUCCESS : EXIT_FAILURE);
4766 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4767 "process: %s", strerror(errno));
4770 /* In the parent, wait if synchronous delivery is required. This will
4771 always be the case in MUA wrapper mode. */
4773 else if (synchronous_delivery)
4776 while (wait(&status) != pid);
4777 if ((status & 0x00ff) != 0)
4778 log_write(0, LOG_MAIN|LOG_PANIC,
4779 "process %d crashed with signal %d while delivering %s",
4780 (int)pid, status & 0x00ff, message_id);
4781 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4785 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4786 automatically reaps children (see comments above the loop), clear away any
4787 finished subprocesses here, in case there are lots of messages coming in
4788 from the same source. */
4790 #ifndef SIG_IGN_WORKS
4791 while (waitpid(-1, NULL, WNOHANG) > 0);
4795 exim_exit(EXIT_SUCCESS); /* Never returns */
4796 return 0; /* To stop compiler warning */