1 /* $Cambridge: exim/src/src/exim.c,v 1.27 2005/09/07 10:15:33 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
402 for (i = 0; i <= 2; i++)
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) (void)dup2(devnull, i);
412 if (devnull > 2) (void)close(devnull);
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
441 Exception: We do want it for synchronous delivery!
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
460 tls_close(FALSE); /* Shut down the TLS library */
462 (void)close(fileno(smtp_in));
463 (void)close(fileno(smtp_out));
468 (void)close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address, and terminates it before the
590 port data when a port is extracted.
593 address the address, with possible port on the end
595 Returns: the port, or zero if there isn't one
596 bombs out on a syntax error
600 check_port(uschar *address)
602 int port = host_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()");
852 fprintf(f, " Expand_dlfunc");
854 #ifdef USE_TCP_WRAPPERS
855 fprintf(f, " TCPwrappers");
859 fprintf(f, " GnuTLS");
861 fprintf(f, " OpenSSL");
864 #ifdef WITH_CONTENT_SCAN
865 fprintf(f, " Content_Scanning");
867 #ifdef WITH_OLD_DEMIME
868 fprintf(f, " Old_Demime");
870 #ifdef EXPERIMENTAL_SPF
871 fprintf(f, " Experimental_SPF");
873 #ifdef EXPERIMENTAL_SRS
874 fprintf(f, " Experimental_SRS");
876 #ifdef EXPERIMENTAL_BRIGHTMAIL
877 fprintf(f, " Experimental_Brightmail");
879 #ifdef EXPERIMENTAL_DOMAINKEYS
880 fprintf(f, " Experimental_DomainKeys");
884 fprintf(f, "Lookups:");
885 #ifdef LOOKUP_LSEARCH
886 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
892 fprintf(f, " dbm dbmnz");
895 fprintf(f, " dnsdb");
897 #ifdef LOOKUP_DSEARCH
898 fprintf(f, " dsearch");
901 fprintf(f, " ibase");
904 fprintf(f, " ldap ldapdn ldapm");
907 fprintf(f, " mysql");
910 fprintf(f, " nis nis0");
912 #ifdef LOOKUP_NISPLUS
913 fprintf(f, " nisplus");
916 fprintf(f, " oracle");
919 fprintf(f, " passwd");
922 fprintf(f, " pgsql");
925 fprintf(f, " sqlite");
928 fprintf(f, " testdb");
931 fprintf(f, " whoson");
935 fprintf(f, "Authenticators:");
937 fprintf(f, " cram_md5");
939 #ifdef AUTH_CYRUS_SASL
940 fprintf(f, " cyrus_sasl");
942 #ifdef AUTH_PLAINTEXT
943 fprintf(f, " plaintext");
950 fprintf(f, "Routers:");
952 fprintf(f, " accept");
954 #ifdef ROUTER_DNSLOOKUP
955 fprintf(f, " dnslookup");
957 #ifdef ROUTER_IPLITERAL
958 fprintf(f, " ipliteral");
960 #ifdef ROUTER_IPLOOKUP
961 fprintf(f, " iplookup");
963 #ifdef ROUTER_MANUALROUTE
964 fprintf(f, " manualroute");
966 #ifdef ROUTER_QUERYPROGRAM
967 fprintf(f, " queryprogram");
969 #ifdef ROUTER_REDIRECT
970 fprintf(f, " redirect");
974 fprintf(f, "Transports:");
975 #ifdef TRANSPORT_APPENDFILE
976 fprintf(f, " appendfile");
977 #ifdef SUPPORT_MAILDIR
978 fprintf(f, "/maildir");
980 #ifdef SUPPORT_MAILSTORE
981 fprintf(f, "/mailstore");
987 #ifdef TRANSPORT_AUTOREPLY
988 fprintf(f, " autoreply");
990 #ifdef TRANSPORT_LMTP
993 #ifdef TRANSPORT_PIPE
996 #ifdef TRANSPORT_SMTP
1001 if (fixed_never_users[0] > 0)
1004 fprintf(f, "Fixed never_users: ");
1005 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1006 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1007 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1014 /*************************************************
1015 * Quote a local part *
1016 *************************************************/
1018 /* This function is used when a sender address or a From: or Sender: header
1019 line is being created from the caller's login, or from an authenticated_id. It
1020 applies appropriate quoting rules for a local part.
1022 Argument: the local part
1023 Returns: the local part, quoted if necessary
1027 local_part_quote(uschar *lpart)
1029 BOOL needs_quote = FALSE;
1034 for (t = lpart; !needs_quote && *t != 0; t++)
1036 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1037 (*t != '.' || t == lpart || t[1] == 0);
1040 if (!needs_quote) return lpart;
1043 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1047 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1050 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1053 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1054 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1055 yield = string_cat(yield, &size, &ptr, nq, 1);
1059 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1067 /*************************************************
1068 * Load readline() functions *
1069 *************************************************/
1071 /* This function is called from testing executions that read data from stdin,
1072 but only when running as the calling user. Currently, only -be does this. The
1073 function loads the readline() function library and passes back the functions.
1074 On some systems, it needs the curses library, so load that too, but try without
1075 it if loading fails. All this functionality has to be requested at build time.
1078 fn_readline_ptr pointer to where to put the readline pointer
1079 fn_addhist_ptr pointer to where to put the addhistory function
1081 Returns: the dlopen handle or NULL on failure
1085 set_readline(char * (**fn_readline_ptr)(char *),
1086 char * (**fn_addhist_ptr)(char *))
1089 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1091 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1092 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1094 if (dlhandle != NULL)
1096 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1097 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1101 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1110 /*************************************************
1111 * Get a line from stdin for testing things *
1112 *************************************************/
1114 /* This function is called when running tests that can take a number of lines
1115 of input (for example, -be and -bt). It handles continuations and trailing
1116 spaces. And prompting and a blank line output on eof. If readline() is in use,
1117 the arguments are non-NULL and provide the relevant functions.
1120 fn_readline readline function or NULL
1121 fn_addhist addhist function or NULL
1123 Returns: pointer to dynamic memory, or NULL at end of file
1127 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1132 uschar *yield = NULL;
1134 if (fn_readline == NULL) printf("> ");
1138 uschar buffer[1024];
1142 char *readline_line = NULL;
1143 if (fn_readline != NULL)
1145 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1146 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1147 p = US readline_line;
1152 /* readline() not in use */
1155 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1159 /* Handle the line */
1161 ss = p + (int)Ustrlen(p);
1162 while (ss > p && isspace(ss[-1])) ss--;
1166 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1169 yield = string_cat(yield, &size, &ptr, p, ss - p);
1172 if (fn_readline != NULL) free(readline_line);
1175 if (ss == p || yield[ptr-1] != '\\')
1183 if (yield == NULL) printf("\n");
1189 /*************************************************
1190 * Entry point and high-level code *
1191 *************************************************/
1193 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1194 the appropriate action. All the necessary functions are present in the one
1195 binary. I originally thought one should split it up, but it turns out that so
1196 much of the apparatus is needed in each chunk that one might as well just have
1197 it all available all the time, which then makes the coding easier as well.
1200 argc count of entries in argv
1201 argv argument strings, with argv[0] being the program name
1203 Returns: EXIT_SUCCESS if terminated successfully
1204 EXIT_FAILURE otherwise, except when a message has been sent
1205 to the sender, and -oee was given
1209 main(int argc, char **cargv)
1211 uschar **argv = USS cargv;
1212 int arg_receive_timeout = -1;
1213 int arg_smtp_receive_timeout = -1;
1214 int arg_error_handling = error_handling;
1215 int filter_sfd = -1;
1216 int filter_ufd = -1;
1219 int list_queue_option = 0;
1221 int msg_action_arg = -1;
1222 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1223 int queue_only_reason = 0;
1225 int perl_start_option = 0;
1227 int recipients_arg = argc;
1228 int sender_address_domain = 0;
1229 int test_retry_arg = -1;
1230 int test_rewrite_arg = -1;
1231 BOOL arg_queue_only = FALSE;
1232 BOOL bi_option = FALSE;
1233 BOOL checking = FALSE;
1234 BOOL count_queue = FALSE;
1235 BOOL expansion_test = FALSE;
1236 BOOL extract_recipients = FALSE;
1237 BOOL forced_delivery = FALSE;
1238 BOOL f_end_dot = FALSE;
1239 BOOL deliver_give_up = FALSE;
1240 BOOL list_queue = FALSE;
1241 BOOL list_options = FALSE;
1242 BOOL local_queue_only;
1244 BOOL one_msg_action = FALSE;
1245 BOOL queue_only_set = FALSE;
1246 BOOL receiving_message = TRUE;
1248 BOOL removed_privilege = FALSE;
1249 BOOL verify_address_mode = FALSE;
1250 BOOL verify_as_sender = FALSE;
1251 BOOL version_printed = FALSE;
1252 uschar *alias_arg = NULL;
1253 uschar *called_as = US"";
1254 uschar *start_queue_run_id = NULL;
1255 uschar *stop_queue_run_id = NULL;
1256 uschar *ftest_domain = NULL;
1257 uschar *ftest_localpart = NULL;
1258 uschar *ftest_prefix = NULL;
1259 uschar *ftest_suffix = NULL;
1260 uschar *real_sender_address;
1261 uschar *originator_home = US"/";
1265 struct stat statbuf;
1266 pid_t passed_qr_pid = (pid_t)0;
1267 int passed_qr_pipe = -1;
1268 gid_t group_list[NGROUPS_MAX];
1270 /* Possible options for -R and -S */
1272 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1274 /* Need to define this in case we need to change the environment in order
1275 to get rid of a bogus time zone. We have to make it char rather than uschar
1276 because some OS define it in /usr/include/unistd.h. */
1278 extern char **environ;
1280 /* If the Exim user and/or group and/or the configuration file owner/group were
1281 defined by ref:name at build time, we must now find the actual uid/gid values.
1282 This is a feature to make the lives of binary distributors easier. */
1284 #ifdef EXIM_USERNAME
1285 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1287 exim_gid = pw->pw_gid;
1291 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1297 #ifdef EXIM_GROUPNAME
1298 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1300 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1306 #ifdef CONFIGURE_OWNERNAME
1307 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1309 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1310 CONFIGURE_OWNERNAME);
1315 #ifdef CONFIGURE_GROUPNAME
1316 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1318 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1319 CONFIGURE_GROUPNAME);
1324 /* In the Cygwin environment, some initialization needs doing. It is fudged
1325 in by means of this macro. */
1331 /* Check a field which is patched when we are running Exim within its
1332 testing harness; do a fast initial check, and then the whole thing. */
1334 running_in_test_harness =
1335 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1337 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1338 at the start of a program; however, it seems that some environments do not
1339 follow this. A "strange" locale can affect the formatting of timestamps, so we
1342 setlocale(LC_ALL, "C");
1344 /* Set up the default handler for timing using alarm(). */
1346 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1348 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1349 because store_malloc writes a log entry on failure. */
1351 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1352 if (log_buffer == NULL)
1354 fprintf(stderr, "exim: failed to get store for log buffer\n");
1358 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1359 NULL when the daemon is run and the file is closed. We have to use this
1360 indirection, because some systems don't allow writing to the variable "stderr".
1363 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1365 /* Arrange for the PCRE regex library to use our store functions. Note that
1366 the normal calls are actually macros that add additional arguments for
1367 debugging purposes so we have to assign specially constructed functions here.
1368 The default is to use store in the stacking pool, but this is overridden in the
1369 regex_must_compile() function. */
1371 pcre_malloc = function_store_get;
1372 pcre_free = function_dummy_free;
1374 /* Ensure there is a big buffer for temporary use in several places. It is put
1375 in malloc store so that it can be freed for enlargement if necessary. */
1377 big_buffer = store_malloc(big_buffer_size);
1379 /* Set up the handler for the data request signal, and set the initial
1380 descriptive text. */
1382 set_process_info("initializing");
1383 os_restarting_signal(SIGUSR1, usr1_handler);
1385 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1386 in the daemon code. For the rest of Exim's uses, we ignore it. */
1388 signal(SIGHUP, SIG_IGN);
1390 /* We don't want to die on pipe errors as the code is written to handle
1391 the write error instead. */
1393 signal(SIGPIPE, SIG_IGN);
1395 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1396 set to SIG_IGN. This causes subprocesses that complete before the parent
1397 process waits for them not to hang around, so when Exim calls wait(), nothing
1398 is there. The wait() code has been made robust against this, but let's ensure
1399 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1400 ending status. We use sigaction rather than plain signal() on those OS where
1401 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1402 problem on AIX with this.) */
1406 struct sigaction act;
1407 act.sa_handler = SIG_DFL;
1408 sigemptyset(&(act.sa_mask));
1410 sigaction(SIGCHLD, &act, NULL);
1413 signal(SIGCHLD, SIG_DFL);
1416 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1421 /* Set up the version number. Set up the leading 'E' for the external form of
1422 message ids, set the pointer to the internal form, and initialize it to
1423 indicate no message being processed. */
1426 message_id_option[0] = '-';
1427 message_id_external = message_id_option + 1;
1428 message_id_external[0] = 'E';
1429 message_id = message_id_external + 1;
1432 /* Set the umask to zero so that any files that Exim creates are created
1433 with the modes that it specifies. */
1437 /* Precompile the regular expression for matching a message id. Keep this in
1438 step with the code that generates ids in the accept.c module. We need to do
1439 this here, because the -M options check their arguments for syntactic validity
1440 using mac_ismsgid, which uses this. */
1443 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1445 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1446 this seems to be a generally accepted convention, since one finds symbolic
1447 links called "mailq" in standard OS configurations. */
1449 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1450 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1453 receiving_message = FALSE;
1454 called_as = US"-mailq";
1457 /* If the program is called as "rmail" treat it as equivalent to
1458 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1459 i.e. preventing a single dot on a line from terminating the message, and
1460 returning with zero return code, even in cases of error (provided an error
1461 message has been sent). */
1463 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1464 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1467 called_as = US"-rmail";
1468 errors_sender_rc = EXIT_SUCCESS;
1471 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1472 this is a smail convention. */
1474 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1475 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1477 smtp_input = smtp_batched_input = TRUE;
1478 called_as = US"-rsmtp";
1481 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1482 this is a smail convention. */
1484 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1485 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1488 receiving_message = FALSE;
1489 called_as = US"-runq";
1492 /* If the program is called as "newaliases" treat it as equivalent to
1493 "exim -bi"; this is a sendmail convention. */
1495 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1496 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1499 receiving_message = FALSE;
1500 called_as = US"-newaliases";
1503 /* Save the original effective uid for a couple of uses later. It should
1504 normally be root, but in some esoteric environments it may not be. */
1506 original_euid = geteuid();
1508 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1509 to be the same as the real ones. This makes a difference only if Exim is setuid
1510 (or setgid) to something other than root, which could be the case in some
1511 special configurations. */
1513 real_uid = getuid();
1514 real_gid = getgid();
1516 if (real_uid == root_uid)
1522 /* If neither the original real uid nor the original euid was root, Exim is
1523 running in an unprivileged state. */
1525 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1527 /* If the first argument is --help, pretend there are no arguments. This will
1528 cause a brief message to be given. */
1530 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1532 /* Scan the program's arguments. Some can be dealt with right away; others are
1533 simply recorded for checking and handling afterwards. Do a high-level switch
1534 on the second character (the one after '-'), to save some effort. */
1536 for (i = 1; i < argc; i++)
1538 BOOL badarg = FALSE;
1539 uschar *arg = argv[i];
1543 /* An argument not starting with '-' is the start of a recipients list;
1544 break out of the options-scanning loop. */
1552 /* An option consistion of -- terminates the options */
1554 if (Ustrcmp(arg, "--") == 0)
1556 recipients_arg = i + 1;
1560 /* Handle flagged options */
1562 switchchar = arg[1];
1565 /* Make all -ex options synonymous with -oex arguments, since that
1566 is assumed by various callers. Also make -qR options synonymous with -R
1567 options, as that seems to be required as well. Allow for -qqR too, and
1568 the same for -S options. */
1570 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1571 Ustrncmp(arg+1, "qR", 2) == 0 ||
1572 Ustrncmp(arg+1, "qS", 2) == 0)
1574 switchchar = arg[2];
1577 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1579 switchchar = arg[3];
1581 queue_2stage = TRUE;
1584 /* Make -r synonymous with -f, since it is a documented alias */
1586 else if (arg[1] == 'r') switchchar = 'f';
1588 /* Make -ov synonymous with -v */
1590 else if (Ustrcmp(arg, "-ov") == 0)
1596 /* High-level switch on active initial letter */
1600 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1601 so has no need of it. */
1604 if (*argrest == 0) i++; /* Skip over the type */
1609 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1611 /* -bd: Run in daemon mode, awaiting SMTP connections.
1612 -bdf: Ditto, but in the foreground.
1615 if (*argrest == 'd')
1617 daemon_listen = TRUE;
1618 if (*(++argrest) == 'f') background_daemon = FALSE;
1619 else if (*argrest != 0) { badarg = TRUE; break; }
1622 /* -be: Run in expansion test mode */
1624 else if (*argrest == 'e')
1625 expansion_test = checking = TRUE;
1627 /* -bF: Run system filter test */
1629 else if (*argrest == 'F')
1631 filter_test |= FTEST_SYSTEM;
1632 if (*(++argrest) != 0) { badarg = TRUE; break; }
1633 if (++i < argc) filter_test_sfile = argv[i]; else
1635 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1640 /* -bf: Run user filter test
1641 -bfd: Set domain for filter testing
1642 -bfl: Set local part for filter testing
1643 -bfp: Set prefix for filter testing
1644 -bfs: Set suffix for filter testing
1647 else if (*argrest == 'f')
1649 if (*(++argrest) == 0)
1651 filter_test |= FTEST_USER;
1652 if (++i < argc) filter_test_ufile = argv[i]; else
1654 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1662 fprintf(stderr, "exim: string expected after %s\n", arg);
1665 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1666 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1667 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1668 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1669 else { badarg = TRUE; break; }
1673 /* -bh: Host checking - an IP address must follow. */
1675 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1677 if (++i >= argc) { badarg = TRUE; break; }
1678 sender_host_address = argv[i];
1679 host_checking = checking = log_testing_mode = TRUE;
1680 host_checking_callout = argrest[1] == 'c';
1683 /* -bi: This option is used by sendmail to initialize *the* alias file,
1684 though it has the -oA option to specify a different file. Exim has no
1685 concept of *the* alias file, but since Sun's YP make script calls
1686 sendmail this way, some support must be provided. */
1688 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1690 /* -bm: Accept and deliver message - the default option. Reinstate
1691 receiving_message, which got turned off for all -b options. */
1693 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1695 /* -bnq: For locally originating messages, do not qualify unqualified
1696 addresses. In the envelope, this causes errors; in header lines they
1699 else if (Ustrcmp(argrest, "nq") == 0)
1701 allow_unqualified_sender = FALSE;
1702 allow_unqualified_recipient = FALSE;
1705 /* -bpxx: List the contents of the mail queue, in various forms. If
1706 the option is -bpc, just a queue count is needed. Otherwise, if the
1707 first letter after p is r, then order is random. */
1709 else if (*argrest == 'p')
1711 if (*(++argrest) == 'c')
1714 if (*(++argrest) != 0) badarg = TRUE;
1718 if (*argrest == 'r')
1720 list_queue_option = 8;
1723 else list_queue_option = 0;
1727 /* -bp: List the contents of the mail queue, top-level only */
1729 if (*argrest == 0) {}
1731 /* -bpu: List the contents of the mail queue, top-level undelivered */
1733 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1735 /* -bpa: List the contents of the mail queue, including all delivered */
1737 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1739 /* Unknown after -bp[r] */
1749 /* -bP: List the configuration variables given as the address list.
1750 Force -v, so configuration errors get displayed. */
1752 else if (Ustrcmp(argrest, "P") == 0)
1754 list_options = TRUE;
1755 debug_selector |= D_v;
1756 debug_file = stderr;
1759 /* -brt: Test retry configuration lookup */
1761 else if (Ustrcmp(argrest, "rt") == 0)
1763 test_retry_arg = i + 1;
1767 /* -brw: Test rewrite configuration */
1769 else if (Ustrcmp(argrest, "rw") == 0)
1771 test_rewrite_arg = i + 1;
1775 /* -bS: Read SMTP commands on standard input, but produce no replies -
1776 all errors are reported by sending messages. */
1778 else if (Ustrcmp(argrest, "S") == 0)
1779 smtp_input = smtp_batched_input = receiving_message = TRUE;
1781 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1782 on standard output. */
1784 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1786 /* -bt: address testing mode */
1788 else if (Ustrcmp(argrest, "t") == 0)
1789 address_test_mode = checking = log_testing_mode = TRUE;
1791 /* -bv: verify addresses */
1793 else if (Ustrcmp(argrest, "v") == 0)
1794 verify_address_mode = checking = log_testing_mode = TRUE;
1796 /* -bvs: verify sender addresses */
1798 else if (Ustrcmp(argrest, "vs") == 0)
1800 verify_address_mode = checking = log_testing_mode = TRUE;
1801 verify_as_sender = TRUE;
1804 /* -bV: Print version string and support details */
1806 else if (Ustrcmp(argrest, "V") == 0)
1808 printf("Exim version %s #%s built %s\n", version_string,
1809 version_cnumber, version_date);
1810 printf("%s\n", CS version_copyright);
1811 version_printed = TRUE;
1812 show_whats_supported(stdout);
1819 /* -C: change configuration file list; ignore if it isn't really
1820 a change! Enforce a prefix check if required. */
1825 if(++i < argc) argrest = argv[i]; else
1826 { badarg = TRUE; break; }
1828 if (Ustrcmp(config_main_filelist, argrest) != 0)
1830 #ifdef ALT_CONFIG_PREFIX
1832 int len = Ustrlen(ALT_CONFIG_PREFIX);
1833 uschar *list = argrest;
1835 while((filename = string_nextinlist(&list, &sep, big_buffer,
1836 big_buffer_size)) != NULL)
1838 if ((Ustrlen(filename) < len ||
1839 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1840 Ustrstr(filename, "/../") != NULL) &&
1841 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1843 fprintf(stderr, "-C Permission denied\n");
1849 config_main_filelist = argrest;
1850 config_changed = TRUE;
1855 /* -D: set up a macro definition */
1858 #ifdef DISABLE_D_OPTION
1859 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1864 macro_item *mlast = NULL;
1867 uschar *s = argrest;
1869 while (isspace(*s)) s++;
1871 if (*s < 'A' || *s > 'Z')
1873 fprintf(stderr, "exim: macro name set by -D must start with "
1874 "an upper case letter\n");
1878 while (isalnum(*s) || *s == '_')
1880 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1884 if (ptr == 0) { badarg = TRUE; break; }
1885 while (isspace(*s)) s++;
1888 if (*s++ != '=') { badarg = TRUE; break; }
1889 while (isspace(*s)) s++;
1892 for (m = macros; m != NULL; m = m->next)
1894 if (Ustrcmp(m->name, name) == 0)
1896 fprintf(stderr, "exim: duplicated -D in command line\n");
1902 m = store_get(sizeof(macro_item) + Ustrlen(name));
1904 m->command_line = TRUE;
1905 if (mlast == NULL) macros = m; else mlast->next = m;
1906 Ustrcpy(m->name, name);
1907 m->replacement = string_copy(s);
1909 if (clmacro_count >= MAX_CLMACROS)
1911 fprintf(stderr, "exim: too many -D options on command line\n");
1914 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1920 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1921 The latter is now a no-op, retained for compatibility only. If -dd is used,
1922 debugging subprocesses of the daemon is disabled. */
1925 if (Ustrcmp(argrest, "ropcr") == 0)
1927 /* drop_cr = TRUE; */
1930 /* Use an intermediate variable so that we don't set debugging while
1931 decoding the debugging bits. */
1935 unsigned int selector = D_default;
1938 if (*argrest == 'd')
1940 debug_daemon = TRUE;
1944 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1945 debug_options_count, US"debug");
1946 debug_selector = selector;
1951 /* -E: This is a local error message. This option is not intended for
1952 external use at all, but is not restricted to trusted callers because it
1953 does no harm (just suppresses certain error messages) and if Exim is run
1954 not setuid root it won't always be trusted when it generates error
1955 messages using this option. If there is a message id following -E, point
1956 message_reference at it, for logging. */
1959 local_error_message = TRUE;
1960 if (mac_ismsgid(argrest)) message_reference = argrest;
1964 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1965 option, so it looks as if historically the -oex options are also callable
1966 without the leading -o. So we have to accept them. Before the switch,
1967 anything starting -oe has been converted to -e. Exim does not support all
1968 of the sendmail error options. */
1971 if (Ustrcmp(argrest, "e") == 0)
1973 arg_error_handling = ERRORS_SENDER;
1974 errors_sender_rc = EXIT_SUCCESS;
1976 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1977 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1978 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1979 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1984 /* -F: Set sender's full name, used instead of the gecos entry from
1985 the password file. Since users can usually alter their gecos entries,
1986 there's no security involved in using this instead. The data can follow
1987 the -F or be in the next argument. */
1992 if(++i < argc) argrest = argv[i]; else
1993 { badarg = TRUE; break; }
1995 originator_name = argrest;
1996 sender_name_forced = TRUE;
2000 /* -f: Set sender's address - this value is only actually used if Exim is
2001 run by a trusted user, or if untrusted_set_sender is set and matches the
2002 address, except that the null address can always be set by any user. The
2003 test for this happens later, when the value given here is ignored when not
2004 permitted. For an untrusted user, the actual sender is still put in Sender:
2005 if it doesn't match the From: header (unless no_local_from_check is set).
2006 The data can follow the -f or be in the next argument. The -r switch is an
2007 obsolete form of -f but since there appear to be programs out there that
2008 use anything that sendmail has ever supported, better accept it - the
2009 synonymizing is done before the switch above.
2011 At this stage, we must allow domain literal addresses, because we don't
2012 know what the setting of allow_domain_literals is yet. Ditto for trailing
2013 dots and strip_trailing_dot. */
2021 if (i+1 < argc) argrest = argv[++i]; else
2022 { badarg = TRUE; break; }
2026 sender_address = string_sprintf(""); /* Ensure writeable memory */
2030 uschar *temp = argrest + Ustrlen(argrest) - 1;
2031 while (temp >= argrest && isspace(*temp)) temp--;
2032 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2033 allow_domain_literals = TRUE;
2034 strip_trailing_dot = TRUE;
2035 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2036 &sender_address_domain, TRUE);
2037 allow_domain_literals = FALSE;
2038 strip_trailing_dot = FALSE;
2039 if (sender_address == NULL)
2041 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2042 return EXIT_FAILURE;
2045 sender_address_forced = TRUE;
2049 /* This is some Sendmail thing which can be ignored */
2054 /* -h: Set the hop count for an incoming message. Exim does not currently
2055 support this; it always computes it by counting the Received: headers.
2056 To put it in will require a change to the spool header file format. */
2061 if(++i < argc) argrest = argv[i]; else
2062 { badarg = TRUE; break; }
2064 if (!isdigit(*argrest)) badarg = TRUE;
2068 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2069 not to be documented for sendmail but mailx (at least) uses it) */
2072 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2077 receiving_message = FALSE;
2079 /* -MC: continue delivery of another message via an existing open
2080 file descriptor. This option is used for an internal call by the
2081 smtp transport when there is a pending message waiting to go to an
2082 address to which it has got a connection. Five subsequent arguments are
2083 required: transport name, host name, IP address, sequence number, and
2084 message_id. Transports may decline to create new processes if the sequence
2085 number gets too big. The channel is stdin. This (-MC) must be the last
2086 argument. There's a subsequent check that the real-uid is privileged.
2088 If we are running in the test harness. delay for a bit, to let the process
2089 that set this one up complete. This makes for repeatability of the logging,
2092 if (Ustrcmp(argrest, "C") == 0)
2096 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2097 return EXIT_FAILURE;
2100 if (msg_action_arg >= 0)
2102 fprintf(stderr, "exim: incompatible arguments\n");
2103 return EXIT_FAILURE;
2106 continue_transport = argv[++i];
2107 continue_hostname = argv[++i];
2108 continue_host_address = argv[++i];
2109 continue_sequence = Uatoi(argv[++i]);
2110 msg_action = MSG_DELIVER;
2111 msg_action_arg = ++i;
2112 forced_delivery = TRUE;
2113 queue_run_pid = passed_qr_pid;
2114 queue_run_pipe = passed_qr_pipe;
2116 if (!mac_ismsgid(argv[i]))
2118 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2120 return EXIT_FAILURE;
2123 if (running_in_test_harness) millisleep(500);
2127 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2128 precedes -MC (see above). The flag indicates that the host to which
2129 Exim is connected has accepted an AUTH sequence. */
2131 else if (Ustrcmp(argrest, "CA") == 0)
2133 smtp_authenticated = TRUE;
2137 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2138 it preceded -MC (see above) */
2140 else if (Ustrcmp(argrest, "CP") == 0)
2142 smtp_use_pipelining = TRUE;
2146 /* -MCQ: pass on the pid of the queue-running process that started
2147 this chain of deliveries and the fd of its synchronizing pipe; this
2148 is useful only when it precedes -MC (see above) */
2150 else if (Ustrcmp(argrest, "CQ") == 0)
2152 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2154 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2159 /* -MCS: set the smtp_use_size flag; this is useful only when it
2160 precedes -MC (see above) */
2162 else if (Ustrcmp(argrest, "CS") == 0)
2164 smtp_use_size = TRUE;
2168 /* -MCT: set the tls_offered flag; this is useful only when it
2169 precedes -MC (see above). The flag indicates that the host to which
2170 Exim is connected has offered TLS support. */
2173 else if (Ustrcmp(argrest, "CT") == 0)
2180 /* -M[x]: various operations on the following list of message ids:
2181 -M deliver the messages, ignoring next retry times and thawing
2182 -Mc deliver the messages, checking next retry times, no thawing
2183 -Mf freeze the messages
2184 -Mg give up on the messages
2185 -Mt thaw the messages
2186 -Mrm remove the messages
2187 In the above cases, this must be the last option. There are also the
2188 following options which are followed by a single message id, and which
2189 act on that message. Some of them use the "recipient" addresses as well.
2190 -Mar add recipient(s)
2191 -Mmad mark all recipients delivered
2192 -Mmd mark recipients(s) delivered
2199 else if (*argrest == 0)
2201 msg_action = MSG_DELIVER;
2202 forced_delivery = deliver_force_thaw = TRUE;
2204 else if (Ustrcmp(argrest, "ar") == 0)
2206 msg_action = MSG_ADD_RECIPIENT;
2207 one_msg_action = TRUE;
2209 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2210 else if (Ustrcmp(argrest, "es") == 0)
2212 msg_action = MSG_EDIT_SENDER;
2213 one_msg_action = TRUE;
2215 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2216 else if (Ustrcmp(argrest, "g") == 0)
2218 msg_action = MSG_DELIVER;
2219 deliver_give_up = TRUE;
2221 else if (Ustrcmp(argrest, "mad") == 0)
2223 msg_action = MSG_MARK_ALL_DELIVERED;
2225 else if (Ustrcmp(argrest, "md") == 0)
2227 msg_action = MSG_MARK_DELIVERED;
2228 one_msg_action = TRUE;
2230 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2231 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2232 else if (Ustrcmp(argrest, "vb") == 0)
2234 msg_action = MSG_SHOW_BODY;
2235 one_msg_action = TRUE;
2237 else if (Ustrcmp(argrest, "vh") == 0)
2239 msg_action = MSG_SHOW_HEADER;
2240 one_msg_action = TRUE;
2242 else if (Ustrcmp(argrest, "vl") == 0)
2244 msg_action = MSG_SHOW_LOG;
2245 one_msg_action = TRUE;
2247 else { badarg = TRUE; break; }
2249 /* All the -Mxx options require at least one message id. */
2251 msg_action_arg = i + 1;
2252 if (msg_action_arg >= argc)
2254 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2255 return EXIT_FAILURE;
2258 /* Some require only message ids to follow */
2260 if (!one_msg_action)
2263 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2265 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2267 return EXIT_FAILURE;
2269 goto END_ARG; /* Remaining args are ids */
2272 /* Others require only one message id, possibly followed by addresses,
2273 which will be handled as normal arguments. */
2277 if (!mac_ismsgid(argv[msg_action_arg]))
2279 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2280 argv[msg_action_arg], arg);
2281 return EXIT_FAILURE;
2288 /* Some programs seem to call the -om option without the leading o;
2289 for sendmail it askes for "me too". Exim always does this. */
2292 if (*argrest != 0) badarg = TRUE;
2296 /* -N: don't do delivery - a debugging option that stops transports doing
2297 their thing. It implies debugging at the D_v level. */
2302 dont_deliver = TRUE;
2303 debug_selector |= D_v;
2304 debug_file = stderr;
2310 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2316 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2317 option to the specified value. This form uses long names. We need to handle
2318 -O option=value and -Ooption=value. */
2325 fprintf(stderr, "exim: string expected after -O\n");
2333 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2336 if (*argrest == 'A')
2338 alias_arg = argrest + 1;
2339 if (alias_arg[0] == 0)
2341 if (i+1 < argc) alias_arg = argv[++i]; else
2343 fprintf(stderr, "exim: string expected after -oA\n");
2349 /* -oB: Set a connection message max value for remote deliveries */
2351 else if (*argrest == 'B')
2353 uschar *p = argrest + 1;
2356 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2358 connection_max_messages = 1;
2367 fprintf(stderr, "exim: number expected after -oB\n");
2370 connection_max_messages = Uatoi(p);
2374 /* -odb: background delivery */
2376 else if (Ustrcmp(argrest, "db") == 0)
2378 synchronous_delivery = FALSE;
2379 arg_queue_only = FALSE;
2380 queue_only_set = TRUE;
2383 /* -odf: foreground delivery (smail-compatible option); same effect as
2384 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2387 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2389 synchronous_delivery = TRUE;
2390 arg_queue_only = FALSE;
2391 queue_only_set = TRUE;
2394 /* -odq: queue only */
2396 else if (Ustrcmp(argrest, "dq") == 0)
2398 synchronous_delivery = FALSE;
2399 arg_queue_only = TRUE;
2400 queue_only_set = TRUE;
2403 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2404 but no remote delivery */
2406 else if (Ustrcmp(argrest, "dqs") == 0)
2409 arg_queue_only = FALSE;
2410 queue_only_set = TRUE;
2413 /* -oex: Sendmail error flags. As these are also accepted without the
2414 leading -o prefix, for compatibility with vacation and other callers,
2415 they are handled with -e above. */
2417 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2418 -oitrue: Another sendmail syntax for the same */
2420 else if (Ustrcmp(argrest, "i") == 0 ||
2421 Ustrcmp(argrest, "itrue") == 0)
2424 /* -oM*: Set various characteristics for an incoming message; actually
2425 acted on for trusted callers only. */
2427 else if (*argrest == 'M')
2431 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2435 /* -oMa: Set sender host address */
2437 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2439 /* -oMaa: Set authenticator name */
2441 else if (Ustrcmp(argrest, "Maa") == 0)
2442 sender_host_authenticated = argv[++i];
2444 /* -oMas: setting authenticated sender */
2446 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2448 /* -oMai: setting authenticated id */
2450 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2452 /* -oMi: Set incoming interface address */
2454 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2456 /* -oMr: Received protocol */
2458 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2460 /* -oMs: Set sender host name */
2462 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2464 /* -oMt: Set sender ident */
2466 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2468 /* Else a bad argument */
2477 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2478 seem to call this as -m (undocumented), so that is also accepted (see
2481 else if (Ustrcmp(argrest, "m") == 0) {}
2483 /* -oo: An ancient flag for old-style addresses which still seems to
2484 crop up in some calls (see in SCO). */
2486 else if (Ustrcmp(argrest, "o") == 0) {}
2488 /* -oP <name>: set pid file path for daemon */
2490 else if (Ustrcmp(argrest, "P") == 0)
2491 override_pid_file_path = argv[++i];
2493 /* -or <n>: set timeout for non-SMTP acceptance
2494 -os <n>: set timeout for SMTP acceptance */
2496 else if (*argrest == 'r' || *argrest == 's')
2498 int *tp = (*argrest == 'r')?
2499 &arg_receive_timeout : &arg_smtp_receive_timeout;
2500 if (argrest[1] == 0)
2502 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2504 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2507 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2512 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2514 else if (Ustrcmp(argrest, "X") == 0)
2515 override_local_interfaces = argv[++i];
2517 /* Unknown -o argument */
2523 /* -ps: force Perl startup; -pd force delayed Perl startup */
2527 if (*argrest == 's' && argrest[1] == 0)
2529 perl_start_option = 1;
2532 if (*argrest == 'd' && argrest[1] == 0)
2534 perl_start_option = -1;
2539 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2540 which sets the host protocol and host name */
2544 if (i+1 < argc) argrest = argv[++i]; else
2545 { badarg = TRUE; break; }
2550 uschar *hn = Ustrchr(argrest, ':');
2553 received_protocol = argrest;
2557 received_protocol = string_copyn(argrest, hn - argrest);
2558 sender_host_name = hn + 1;
2565 receiving_message = FALSE;
2567 /* -qq...: Do queue runs in a 2-stage manner */
2569 if (*argrest == 'q')
2571 queue_2stage = TRUE;
2575 /* -qi...: Do only first (initial) deliveries */
2577 if (*argrest == 'i')
2579 queue_run_first_delivery = TRUE;
2583 /* -qf...: Run the queue, forcing deliveries
2584 -qff..: Ditto, forcing thawing as well */
2586 if (*argrest == 'f')
2588 queue_run_force = TRUE;
2589 if (*(++argrest) == 'f')
2591 deliver_force_thaw = TRUE;
2596 /* -q[f][f]l...: Run the queue only on local deliveries */
2598 if (*argrest == 'l')
2600 queue_run_local = TRUE;
2604 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2605 optionally starting from a given message id. */
2607 if (*argrest == 0 &&
2608 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2611 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2612 start_queue_run_id = argv[++i];
2613 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2614 stop_queue_run_id = argv[++i];
2617 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2618 optionally local only. */
2623 queue_interval = readconf_readtime(argrest, 0, FALSE);
2625 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2626 if (queue_interval <= 0)
2628 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2635 case 'R': /* Synonymous with -qR... */
2636 receiving_message = FALSE;
2638 /* -Rf: As -R (below) but force all deliveries,
2639 -Rff: Ditto, but also thaw all frozen messages,
2640 -Rr: String is regex
2641 -Rrf: Regex and force
2642 -Rrff: Regex and force and thaw
2644 in all cases provided there are no further characters in this
2650 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2652 if (Ustrcmp(argrest, rsopts[i]) == 0)
2654 if (i != 2) queue_run_force = TRUE;
2655 if (i >= 2) deliver_selectstring_regex = TRUE;
2656 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2657 argrest += Ustrlen(rsopts[i]);
2662 /* -R: Set string to match in addresses for forced queue run to
2663 pick out particular messages. */
2667 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2669 fprintf(stderr, "exim: string expected after -R\n");
2673 else deliver_selectstring = argrest;
2674 if (queue_interval < 0) queue_interval = 0;
2678 /* -r: an obsolete synonym for -f (see above) */
2681 /* -S: Like -R but works on sender. */
2683 case 'S': /* Synonymous with -qS... */
2684 receiving_message = FALSE;
2686 /* -Sf: As -S (below) but force all deliveries,
2687 -Sff: Ditto, but also thaw all frozen messages,
2688 -Sr: String is regex
2689 -Srf: Regex and force
2690 -Srff: Regex and force and thaw
2692 in all cases provided there are no further characters in this
2698 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2700 if (Ustrcmp(argrest, rsopts[i]) == 0)
2702 if (i != 2) queue_run_force = TRUE;
2703 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2704 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2705 argrest += Ustrlen(rsopts[i]);
2710 /* -S: Set string to match in addresses for forced queue run to
2711 pick out particular messages. */
2715 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2717 fprintf(stderr, "exim: string expected after -S\n");
2721 else deliver_selectstring_sender = argrest;
2722 if (queue_interval < 0) queue_interval = 0;
2725 /* -Tqt is an option that is exclusively for use by the testing suite.
2726 It is not recognized in other circumstances. It allows for the setting up
2727 of explicit "queue times" so that various warning/retry things can be
2728 tested. Otherwise variability of clock ticks etc. cause problems. */
2731 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2732 fudged_queue_times = argv[++i];
2737 /* -t: Set flag to extract recipients from body of message. */
2740 if (*argrest == 0) extract_recipients = TRUE;
2742 /* -ti: Set flag to extract recipients from body of message, and also
2743 specify that dot does not end the message. */
2745 else if (Ustrcmp(argrest, "i") == 0)
2747 extract_recipients = TRUE;
2751 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2754 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2761 /* -U: This means "initial user submission" in sendmail, apparently. The
2762 doc claims that in future sendmail may refuse syntactically invalid
2763 messages instead of fixing them. For the moment, we just ignore it. */
2769 /* -v: verify things - this is a very low-level debugging */
2774 debug_selector |= D_v;
2775 debug_file = stderr;
2781 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2783 The -x flag tells the sendmail command that mail from a local
2784 mail program has National Language Support (NLS) extended characters
2785 in the body of the mail item. The sendmail command can send mail with
2786 extended NLS characters across networks that normally corrupts these
2789 As Exim is 8-bit clean, it just ignores this flag. */
2792 if (*argrest != 0) badarg = TRUE;
2795 /* All other initial characters are errors */
2800 } /* End of high-level switch statement */
2802 /* Failed to recognize the option, or syntax error */
2806 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2807 "option %s\n", arg);
2813 /* Arguments have been processed. Check for incompatibilities. */
2817 (smtp_input || extract_recipients || recipients_arg < argc) &&
2818 (daemon_listen || queue_interval >= 0 || bi_option ||
2819 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2820 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2823 msg_action_arg > 0 &&
2824 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2825 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2828 (daemon_listen || queue_interval >= 0) &&
2829 (sender_address != NULL || list_options || list_queue || checking ||
2833 daemon_listen && queue_interval == 0
2837 (checking || smtp_input || extract_recipients ||
2838 filter_test != FTEST_NONE || bi_option)
2841 verify_address_mode &&
2842 (address_test_mode || smtp_input || extract_recipients ||
2843 filter_test != FTEST_NONE || bi_option)
2846 address_test_mode && (smtp_input || extract_recipients ||
2847 filter_test != FTEST_NONE || bi_option)
2850 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2854 deliver_selectstring != NULL && queue_interval < 0
2858 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2862 /* If debugging is set up, set the file and the file descriptor to pass on to
2863 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2864 to run in the foreground. */
2866 if (debug_selector != 0)
2868 debug_file = stderr;
2869 debug_fd = fileno(debug_file);
2870 background_daemon = FALSE;
2871 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2872 if (debug_selector != D_v) /* -v only doesn't show this */
2874 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2875 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2877 show_whats_supported(stderr);
2881 /* When started with root privilege, ensure that the limits on the number of
2882 open files and the number of processes (where that is accessible) are
2883 sufficiently large, or are unset, in case Exim has been called from an
2884 environment where the limits are screwed down. Not all OS have the ability to
2885 change some of these limits. */
2889 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2895 #ifdef RLIMIT_NOFILE
2896 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2898 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2900 rlp.rlim_cur = rlp.rlim_max = 0;
2903 /* I originally chose 1000 as a nice big number that was unlikely to
2904 be exceeded. It turns out that some older OS have a fixed upper limit of
2907 if (rlp.rlim_cur < 1000)
2909 rlp.rlim_cur = rlp.rlim_max = 1000;
2910 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2912 rlp.rlim_cur = rlp.rlim_max = 256;
2913 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2914 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2921 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2923 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2925 rlp.rlim_cur = rlp.rlim_max = 0;
2928 #ifdef RLIM_INFINITY
2929 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2931 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2933 if (rlp.rlim_cur < 1000)
2935 rlp.rlim_cur = rlp.rlim_max = 1000;
2937 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2938 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2944 /* Exim is normally entered as root (but some special configurations are
2945 possible that don't do this). However, it always spins off sub-processes that
2946 set their uid and gid as required for local delivery. We don't want to pass on
2947 any extra groups that root may belong to, so we want to get rid of them all at
2950 We need to obey setgroups() at this stage, before possibly giving up root
2951 privilege for a changed configuration file, but later on we might need to
2952 check on the additional groups for the admin user privilege - can't do that
2953 till after reading the config, which might specify the exim gid. Therefore,
2954 save the group list here first. */
2956 group_count = getgroups(NGROUPS_MAX, group_list);
2958 /* There is a fundamental difference in some BSD systems in the matter of
2959 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2960 known not to be different. On the "different" systems there is a single group
2961 list, and the first entry in it is the current group. On all other versions of
2962 Unix there is a supplementary group list, which is in *addition* to the current
2963 group. Consequently, to get rid of all extraneous groups on a "standard" system
2964 you pass over 0 groups to setgroups(), while on a "different" system you pass
2965 over a single group - the current group, which is always the first group in the
2966 list. Calling setgroups() with zero groups on a "different" system results in
2967 an error return. The following code should cope with both types of system.
2969 However, if this process isn't running as root, setgroups() can't be used
2970 since you have to be root to run it, even if throwing away groups. Not being
2971 root here happens only in some unusual configurations. We just ignore the
2974 if (setgroups(0, NULL) != 0)
2976 if (setgroups(1, group_list) != 0 && !unprivileged)
2978 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2983 /* If the configuration file name has been altered by an argument on the
2984 command line (either a new file name or a macro definition) and the caller is
2985 not root or the exim user, or if this is a filter testing run, remove any
2986 setuid privilege the program has, and run as the underlying user.
2988 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2989 severely restricts the use of -C for some purposes.
2991 Otherwise, set the real ids to the effective values (should be root unless run
2992 from inetd, which it can either be root or the exim uid, if one is configured).
2994 There is a private mechanism for bypassing some of this, in order to make it
2995 possible to test lots of configurations automatically, without having either to
2996 recompile each time, or to patch in an actual configuration file name and other
2997 values (such as the path name). If running in the test harness, pretend that
2998 configuration file changes and macro definitions haven't happened. */
3001 (config_changed || macros != NULL) && /* Config changed, and */
3002 real_uid != root_uid && /* Not root, and */
3003 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3004 real_uid != exim_uid && /* Not exim, and */
3006 !running_in_test_harness /* Not fudged */
3008 expansion_test /* expansion testing */
3010 filter_test != FTEST_NONE) /* Filter testing */
3012 setgroups(group_count, group_list);
3013 exim_setugid(real_uid, real_gid, FALSE,
3014 US"-C, -D, -be or -bf forces real uid");
3015 removed_privilege = TRUE;
3017 /* In the normal case when Exim is called like this, stderr is available
3018 and should be used for any logging information because attempts to write
3019 to the log will usually fail. To arrange this, we unset really_exim. However,
3020 if no stderr is available there is no point - we might as well have a go
3021 at the log (if it fails, syslog will be written). */
3023 if (log_stderr != NULL) really_exim = FALSE;
3026 /* Privilege is to be retained for the moment. It may be dropped later,
3027 depending on the job that this Exim process has been asked to do. For now, set
3028 the real uid to the effective so that subsequent re-execs of Exim are done by a
3031 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3033 /* If testing a filter, open the file(s) now, before wasting time doing other
3034 setups and reading the message. */
3036 if ((filter_test & FTEST_SYSTEM) != 0)
3038 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3041 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3043 return EXIT_FAILURE;
3047 if ((filter_test & FTEST_USER) != 0)
3049 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3052 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3054 return EXIT_FAILURE;
3058 /* Read the main runtime configuration data; this gives up if there
3059 is a failure. It leaves the configuration file open so that the subsequent
3060 configuration data for delivery can be read if needed. */
3064 /* Handle the decoding of logging options. */
3066 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3067 log_options, log_options_count, US"log");
3071 debug_printf("configuration file is %s\n", config_main_filename);
3072 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3073 log_extra_selector);
3076 /* If domain literals are not allowed, check the sender address that was
3077 supplied with -f. Ditto for a stripped trailing dot. */
3079 if (sender_address != NULL)
3081 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3083 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3084 "allowed\n", sender_address);
3085 return EXIT_FAILURE;
3087 if (f_end_dot && !strip_trailing_dot)
3089 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3090 "(trailing dot not allowed)\n", sender_address);
3091 return EXIT_FAILURE;
3095 /* Paranoia check of maximum lengths of certain strings. There is a check
3096 on the length of the log file path in log.c, which will come into effect
3097 if there are any calls to write the log earlier than this. However, if we
3098 get this far but the string is very long, it is better to stop now than to
3099 carry on and (e.g.) receive a message and then have to collapse. The call to
3100 log_write() from here will cause the ultimate panic collapse if the complete
3101 file name exceeds the buffer length. */
3103 if (Ustrlen(log_file_path) > 200)
3104 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3105 "log_file_path is longer than 200 chars: aborting");
3107 if (Ustrlen(pid_file_path) > 200)
3108 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3109 "pid_file_path is longer than 200 chars: aborting");
3111 if (Ustrlen(spool_directory) > 200)
3112 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3113 "spool_directory is longer than 200 chars: aborting");
3115 /* Length check on the process name given to syslog for its TAG field,
3116 which is only permitted to be 32 characters or less. See RFC 3164. */
3118 if (Ustrlen(syslog_processname) > 32)
3119 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3120 "syslog_processname is longer than 32 chars: aborting");
3122 /* In some operating systems, the environment variable TMPDIR controls where
3123 temporary files are created; Exim doesn't use these (apart from when delivering
3124 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3125 If TMPDIR is found in the environment, reset it to the value defined in the
3126 TMPDIR macro, if this macro is defined. */
3131 for (p = USS environ; *p != NULL; p++)
3133 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3134 Ustrcmp(*p+7, TMPDIR) != 0)
3136 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3137 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3139 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3145 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3146 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3147 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3148 called by a user who has set the TZ variable. This then affects the timestamps
3149 in log files and in Received: headers, and any created Date: header lines. The
3150 required timezone is settable in the configuration file, so nothing can be done
3151 about this earlier - but hopefully nothing will normally be logged earlier than
3152 this. We have to make a new environment if TZ is wrong, but don't bother if
3153 timestamps_utc is set, because then all times are in UTC anyway. */
3155 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3157 timestamps_utc = TRUE;
3161 uschar *envtz = US getenv("TZ");
3162 if ((envtz == NULL && timezone_string != NULL) ||
3164 (timezone_string == NULL ||
3165 Ustrcmp(timezone_string, envtz) != 0)))
3167 uschar **p = USS environ;
3171 while (*p++ != NULL) count++;
3172 if (envtz == NULL) count++;
3173 newp = new = malloc(sizeof(uschar *) * (count + 1));
3174 for (p = USS environ; *p != NULL; p++)
3176 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3179 if (timezone_string != NULL)
3181 *newp = malloc(Ustrlen(timezone_string) + 4);
3182 sprintf(CS *newp++, "TZ=%s", timezone_string);
3187 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3188 tod_stamp(tod_log));
3192 /* Handle the case when we have removed the setuid privilege because of -C or
3193 -D. This means that the caller of Exim was not root, and, provided that
3194 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3197 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3198 were running as the exim user defined in the configuration file (different to
3199 the one in the binary). The sysadmin may expect this case to retain privilege
3200 because "the binary was called by the Exim user", but it hasn't, because of the
3201 order in which it handles this stuff. There are two possibilities:
3203 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3204 to do message deliveries. Thus, the fact that it is running as a
3205 non-privileged user is plausible, and might be wanted in some special
3206 configurations. However, really_exim will have been set false when
3207 privilege was dropped, to stop Exim trying to write to its normal log
3208 files. Therefore, re-enable normal log processing, assuming the sysadmin
3209 has set up the log directory correctly.
3211 (2) If deliver_drop_privilege is not set, the configuration won't work as
3212 apparently intended, and so we log a panic message. In order to retain
3213 root for -C or -D, the caller must either be root or the Exim user
3214 defined in the binary (when deliver_drop_ privilege is false).
3216 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3217 built-in exim user or one defined in the configuration. In either event,
3218 re-enable log processing, assuming the sysadmin knows what they are doing. */
3220 if (removed_privilege && (config_changed || macros != NULL) &&
3221 real_uid == exim_uid)
3223 #ifdef ALT_CONFIG_ROOT_ONLY
3224 really_exim = TRUE; /* let logging work normally */
3227 if (deliver_drop_privilege)
3228 really_exim = TRUE; /* let logging work normally */
3230 log_write(0, LOG_MAIN|LOG_PANIC,
3231 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3232 (int)exim_uid, config_changed? "-C" : "-D");
3236 /* Start up Perl interpreter if Perl support is configured and there is a
3237 perl_startup option, and the configuration or the command line specifies
3238 initializing starting. Note that the global variables are actually called
3239 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3242 if (perl_start_option != 0)
3243 opt_perl_at_start = (perl_start_option > 0);
3244 if (opt_perl_at_start && opt_perl_startup != NULL)
3247 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3248 errstr = init_perl(opt_perl_startup);
3251 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3252 return EXIT_FAILURE;
3254 opt_perl_started = TRUE;
3256 #endif /* EXIM_PERL */
3258 /* Log the arguments of the call if the configuration file said so. This is
3259 a debugging feature for finding out what arguments certain MUAs actually use.
3260 Don't attempt it if logging is disabled, or if listing variables or if
3261 verifying/testing addresses or expansions. */
3263 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3264 && really_exim && !list_options && !checking)
3267 uschar *p = big_buffer;
3269 (void)getcwd(CS p+4, big_buffer_size - 4);
3271 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3273 for (i = 0; i < argc; i++)
3275 int len = Ustrlen(argv[i]);
3278 if (p + len + 8 >= big_buffer + big_buffer_size)
3281 log_write(0, LOG_MAIN, "%s", big_buffer);
3282 Ustrcpy(big_buffer, "...");
3285 printing = string_printing(argv[i]);
3286 if (printing[0] == 0) quote = US"\""; else
3288 uschar *pp = printing;
3290 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3292 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3293 (p - big_buffer) - 4), printing, quote);
3297 if ((log_extra_selector & LX_arguments) != 0)
3298 log_write(0, LOG_MAIN, "%s", big_buffer);
3300 debug_printf("%s\n", big_buffer);
3303 /* Set the working directory to be the top-level spool directory. We don't rely
3304 on this in the code, which always uses fully qualified names, but it's useful
3305 for core dumps etc. Don't complain if it fails - the spool directory might not
3306 be generally accessible and calls with the -C option (and others) have lost
3307 privilege by now. Before the chdir, we try to ensure that the directory exists.
3310 if (Uchdir(spool_directory) != 0)
3312 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3313 (void)Uchdir(spool_directory);
3316 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3317 alias file. Exim doesn't have such a concept, but this call is screwed into
3318 Sun's YP makefiles. Handle this by calling a configured script, as the real
3319 user who called Exim. The -oA option can be used to pass an argument to the
3324 (void)fclose(config_file);
3325 if (bi_command != NULL)
3329 argv[i++] = bi_command;
3330 if (alias_arg != NULL) argv[i++] = alias_arg;
3333 setgroups(group_count, group_list);
3334 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3336 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3337 (argv[1] == NULL)? US"" : argv[1]);
3339 execv(CS argv[0], (char *const *)argv);
3340 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3345 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3350 /* If an action on specific messages is requested, or if a daemon or queue
3351 runner is being started, we need to know if Exim was called by an admin user.
3352 This is the case if the real user is root or exim, or if the real group is
3353 exim, or if one of the supplementary groups is exim or a group listed in
3354 admin_groups. We don't fail all message actions immediately if not admin_user,
3355 since some actions can be performed by non-admin users. Instead, set admin_user
3356 for later interrogation. */
3358 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3364 for (i = 0; i < group_count; i++)
3366 if (group_list[i] == exim_gid) admin_user = TRUE;
3367 else if (admin_groups != NULL)
3369 for (j = 1; j <= (int)(admin_groups[0]); j++)
3370 if (admin_groups[j] == group_list[i])
3371 { admin_user = TRUE; break; }
3373 if (admin_user) break;
3377 /* Another group of privileged users are the trusted users. These are root,
3378 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3379 are permitted to specify sender_addresses with -f on the command line, and
3380 other message parameters as well. */
3382 if (real_uid == root_uid || real_uid == exim_uid)
3383 trusted_caller = TRUE;
3388 if (trusted_users != NULL)
3390 for (i = 1; i <= (int)(trusted_users[0]); i++)
3391 if (trusted_users[i] == real_uid)
3392 { trusted_caller = TRUE; break; }
3395 if (!trusted_caller && trusted_groups != NULL)
3397 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3399 if (trusted_groups[i] == real_gid)
3400 trusted_caller = TRUE;
3401 else for (j = 0; j < group_count; j++)
3403 if (trusted_groups[i] == group_list[j])
3404 { trusted_caller = TRUE; break; }
3406 if (trusted_caller) break;
3411 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3412 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3414 /* Only an admin user may start the daemon or force a queue run in the default
3415 configuration, but the queue run restriction can be relaxed. Only an admin
3416 user may request that a message be returned to its sender forthwith. Only an
3417 admin user may specify a debug level greater than D_v (because it might show
3418 passwords, etc. in lookup queries). Only an admin user may request a queue
3423 BOOL debugset = (debug_selector & ~D_v) != 0;
3424 if (deliver_give_up || daemon_listen ||
3425 (count_queue && queue_list_requires_admin) ||
3426 (list_queue && queue_list_requires_admin) ||
3427 (queue_interval >= 0 && prod_requires_admin) ||
3428 (debugset && !running_in_test_harness))
3430 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3435 /* If the real user is not root or the exim uid, the argument for passing
3436 in an open TCP/IP connection for another message is not permitted, nor is
3437 running with the -N option for any delivery action, unless this call to exim is
3438 one that supplied an input message, or we are using a patched exim for
3439 regression testing. */
3441 if (real_uid != root_uid && real_uid != exim_uid &&
3442 (continue_hostname != NULL ||
3444 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3445 )) && !running_in_test_harness)
3447 fprintf(stderr, "exim: Permission denied\n");
3448 return EXIT_FAILURE;
3451 /* If the caller is not trusted, certain arguments are ignored when running for
3452 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3453 Note that authority for performing certain actions on messages is tested in the
3454 queue_action() function. */
3456 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3458 sender_host_name = sender_host_address = interface_address =
3459 sender_ident = received_protocol = NULL;
3460 sender_host_port = interface_port = 0;
3461 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3464 /* If a sender host address is set, extract the optional port number off the
3465 end of it and check its syntax. Do the same thing for the interface address.
3466 Exim exits if the syntax is bad. */
3470 if (sender_host_address != NULL)
3471 sender_host_port = check_port(sender_host_address);
3472 if (interface_address != NULL)
3473 interface_port = check_port(interface_address);
3476 /* If an SMTP message is being received check to see if the standard input is a
3477 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3478 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3483 union sockaddr_46 inetd_sock;
3484 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3485 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3487 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3488 if (family == AF_INET || family == AF_INET6)
3490 union sockaddr_46 interface_sock;
3491 size = sizeof(interface_sock);
3493 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3494 interface_address = host_ntoa(-1, &interface_sock, NULL,
3497 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3499 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3502 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3503 NULL, &sender_host_port);
3504 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3505 "inetd is not supported when mua_wrapper is set");
3510 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3511 return EXIT_FAILURE;
3517 /* If the load average is going to be needed while receiving a message, get it
3518 now for those OS that require the first call to os_getloadavg() to be done as
3519 root. There will be further calls later for each message received. */
3521 #ifdef LOAD_AVG_NEEDS_ROOT
3522 if (receiving_message &&
3523 (queue_only_load >= 0 ||
3524 (is_inetd && smtp_load_reserve >= 0)
3527 load_average = os_getloadavg();
3531 /* The queue_only configuration option can be overridden by -odx on the command
3532 line, except that if queue_only_override is false, queue_only cannot be unset
3533 from the command line. */
3535 if (queue_only_set && (queue_only_override || arg_queue_only))
3536 queue_only = arg_queue_only;
3538 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3541 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3542 if (arg_smtp_receive_timeout >= 0)
3543 smtp_receive_timeout = arg_smtp_receive_timeout;
3545 /* If Exim was started with root privilege, unless we have already removed the
3546 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3547 except when starting the daemon or doing some kind of delivery or address
3548 testing (-bt). These are the only cases when root need to be retained. We run
3549 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3550 retained only for starting the daemon. */
3552 if (!unprivileged && /* originally had root AND */
3553 !removed_privilege && /* still got root AND */
3554 !daemon_listen && /* not starting the daemon */
3555 queue_interval <= 0 && /* (either kind of daemon) */
3557 deliver_drop_privilege || /* requested unprivileged */
3559 queue_interval < 0 && /* not running the queue */
3560 (msg_action_arg < 0 || /* and */
3561 msg_action != MSG_DELIVER) && /* not delivering and */
3562 (!checking || !address_test_mode) /* not address checking */
3566 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3569 /* When we are retaining a privileged uid, we still change to the exim gid. */
3571 else setgid(exim_gid);
3573 /* Handle a request to list the delivery queue */
3577 set_process_info("listing the queue");
3578 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3582 /* Handle a request to count the delivery queue */
3586 set_process_info("counting the queue");
3591 /* Handle actions on specific messages, except for the force delivery action,
3592 which is done below. Some actions take a whole list of message ids, which
3593 are known to continue up to the end of the arguments. Others take a single
3594 message id and then operate on the recipients list. */
3596 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3598 int yield = EXIT_SUCCESS;
3599 set_process_info("acting on specified messages");
3601 if (!one_msg_action)
3603 for (i = msg_action_arg; i < argc; i++)
3604 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3605 yield = EXIT_FAILURE;
3608 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3609 recipients_arg)) yield = EXIT_FAILURE;
3613 /* All the modes below here require the remaining configuration sections
3614 to be read, except that we can skip over the ACL setting when delivering
3615 specific messages, or doing a queue run. (For various testing cases we could
3616 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3619 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3621 /* The configuration data will have been read into POOL_PERM because we won't
3622 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3623 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3624 configuration were read into POOL_MAIN, because we don't do any resets till
3625 later on. However, it seems right, and it does ensure that both pools get used.
3628 store_pool = POOL_MAIN;
3630 /* Handle the -brt option. This is for checking out retry configurations.
3631 The next three arguments are a domain name or a complete address, and
3632 optionally two error numbers. All it does is to call the function that
3633 scans the retry configuration data. */
3635 if (test_retry_arg >= 0)
3637 retry_config *yield;
3638 int basic_errno = 0;
3642 if (test_retry_arg >= argc)
3644 printf("-brt needs a domain or address argument\n");
3645 exim_exit(EXIT_FAILURE);
3647 s1 = argv[test_retry_arg++];
3650 /* If the first argument contains no @ and no . it might be a local user
3651 or it might be a single-component name. Treat as a domain. */
3653 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3655 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3656 "being \ntreated as a one-component domain, not as a local part.\n\n",
3660 /* There may be an optional second domain arg. */
3662 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3663 s2 = argv[test_retry_arg++];
3665 /* The final arg is an error name */
3667 if (test_retry_arg < argc)
3669 uschar *ss = argv[test_retry_arg];
3671 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3674 printf("%s\n", CS error);
3675 return EXIT_FAILURE;
3678 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3679 an error is for matching codes to the decade. Turn them into a real error
3680 code, off the decade. */
3682 if (basic_errno == ERRNO_RCPT4XX)
3684 int code = (more_errno >> 8) & 255;
3686 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3687 else if (code > 100)
3688 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3692 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3693 if (yield == NULL) printf("No retry information found\n"); else
3696 more_errno = yield->more_errno;
3697 printf("Retry rule: %s ", yield->pattern);
3699 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3701 printf("quota%s%s ",
3702 (more_errno > 0)? "_" : "",
3703 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3705 else if (yield->basic_errno == ECONNREFUSED)
3707 printf("refused%s%s ",
3708 (more_errno > 0)? "_" : "",
3709 (more_errno == 'M')? "MX" :
3710 (more_errno == 'A')? "A" : "");
3712 else if (yield->basic_errno == ETIMEDOUT)
3715 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3717 if (more_errno != 0) printf("_%s",
3718 (more_errno == 'M')? "MX" : "A");
3721 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3722 printf("auth_failed ");
3725 for (r = yield->rules; r != NULL; r = r->next)
3727 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3728 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3734 printf(",%d.", x/1000);
3748 exim_exit(EXIT_SUCCESS);
3751 /* Handle a request to list one or more configuration options */
3755 set_process_info("listing variables");
3756 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3757 else for (i = recipients_arg; i < argc; i++)
3760 (Ustrcmp(argv[i], "router") == 0 ||
3761 Ustrcmp(argv[i], "transport") == 0 ||
3762 Ustrcmp(argv[i], "authenticator") == 0))
3764 readconf_print(argv[i+1], argv[i]);
3767 else readconf_print(argv[i], NULL);
3769 exim_exit(EXIT_SUCCESS);
3773 /* Handle a request to deliver one or more messages that are already on the
3774 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3775 is typically used for a small number when prodding by hand (when the option
3776 forced_delivery will be set) or when re-execing to regain root privilege.
3777 Each message delivery must happen in a separate process, so we fork a process
3778 for each one, and run them sequentially so that debugging output doesn't get
3779 intertwined, and to avoid spawning too many processes if a long list is given.
3780 However, don't fork for the last one; this saves a process in the common case
3781 when Exim is called to deliver just one message. */
3783 if (msg_action_arg > 0)
3785 if (prod_requires_admin && !admin_user)
3787 fprintf(stderr, "exim: Permission denied\n");
3788 exim_exit(EXIT_FAILURE);
3790 set_process_info("delivering specified messages");
3791 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3792 for (i = msg_action_arg; i < argc; i++)
3797 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3798 else if ((pid = fork()) == 0)
3800 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3801 _exit(EXIT_SUCCESS);
3805 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3807 exim_exit(EXIT_FAILURE);
3811 exim_exit(EXIT_SUCCESS);
3815 /* If only a single queue run is requested, without SMTP listening, we can just
3816 turn into a queue runner, with an optional starting message id. */
3818 if (queue_interval == 0 && !daemon_listen)
3820 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3821 (start_queue_run_id == NULL)? US"" : US" starting at ",
3822 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3823 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3824 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3825 set_process_info("running the queue (single queue run)");
3826 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3827 exim_exit(EXIT_SUCCESS);
3831 /* Find the login name of the real user running this process. This is always
3832 needed when receiving a message, because it is written into the spool file. It
3833 may also be used to construct a from: or a sender: header, and in this case we
3834 need the user's full name as well, so save a copy of it, checked for RFC822
3835 syntax and munged if necessary, if it hasn't previously been set by the -F
3836 argument. We may try to get the passwd entry more than once, in case NIS or
3837 other delays are in evidence. Save the home directory for use in filter testing
3842 if ((pw = getpwuid(real_uid)) != NULL)
3844 originator_login = string_copy(US pw->pw_name);
3845 originator_home = string_copy(US pw->pw_dir);
3847 /* If user name has not been set by -F, set it from the passwd entry
3848 unless -f has been used to set the sender address by a trusted user. */
3850 if (originator_name == NULL)
3852 if (sender_address == NULL ||
3853 (!trusted_caller && filter_test == FTEST_NONE))
3855 uschar *name = US pw->pw_gecos;
3856 uschar *amp = Ustrchr(name, '&');
3859 /* Most Unix specify that a '&' character in the gecos field is
3860 replaced by a copy of the login name, and some even specify that
3861 the first character should be upper cased, so that's what we do. */
3866 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3867 amp - name, name, &loffset, originator_login, amp + 1);
3868 buffer[loffset] = toupper(buffer[loffset]);
3872 /* If a pattern for matching the gecos field was supplied, apply
3873 it and then expand the name string. */
3875 if (gecos_pattern != NULL && gecos_name != NULL)
3878 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3880 if (regex_match_and_setup(re, name, 0, -1))
3882 uschar *new_name = expand_string(gecos_name);
3884 if (new_name != NULL)
3886 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3887 "gecos field \"%s\"\n", new_name, name);
3890 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3891 "\"%s\": %s\n", gecos_name, expand_string_message);
3893 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3894 "gecos field \"%s\"\n", gecos_pattern, name);
3895 store_free((void *)re);
3897 originator_name = string_copy(name);
3900 /* A trusted caller has used -f but not -F */
3902 else originator_name = US"";
3905 /* Break the retry loop */
3910 if (++i > finduser_retries) break;
3914 /* If we cannot get a user login, log the incident and give up, unless the
3915 configuration specifies something to use. When running in the test harness,
3916 any setting of unknown_login overrides the actual login name. */
3918 if (originator_login == NULL || running_in_test_harness)
3920 if (unknown_login != NULL)
3922 originator_login = expand_string(unknown_login);
3923 if (originator_name == NULL && unknown_username != NULL)
3924 originator_name = expand_string(unknown_username);
3925 if (originator_name == NULL) originator_name = US"";
3927 if (originator_login == NULL)
3928 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3932 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3935 originator_name = string_copy(parse_fix_phrase(originator_name,
3936 Ustrlen(originator_name), big_buffer, big_buffer_size));
3938 /* If a message is created by this call of Exim, the uid/gid of its originator
3939 are those of the caller. These values are overridden if an existing message is
3940 read in from the spool. */
3942 originator_uid = real_uid;
3943 originator_gid = real_gid;
3945 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3946 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3948 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3949 returns. We leave this till here so that the originator_ fields are available
3950 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3953 if (daemon_listen || queue_interval > 0)
3957 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3958 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3959 "mua_wrapper is set");
3964 /* If the sender ident has not been set (by a trusted caller) set it to
3965 the caller. This will get overwritten below for an inetd call. If a trusted
3966 caller has set it empty, unset it. */
3968 if (sender_ident == NULL) sender_ident = originator_login;
3969 else if (sender_ident[0] == 0) sender_ident = NULL;
3971 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3972 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3973 originator_* variables set. */
3975 if (test_rewrite_arg >= 0)
3977 really_exim = FALSE;
3978 if (test_rewrite_arg >= argc)
3980 printf("-brw needs an address argument\n");
3981 exim_exit(EXIT_FAILURE);
3983 rewrite_test(argv[test_rewrite_arg]);
3984 exim_exit(EXIT_SUCCESS);
3987 /* A locally-supplied message is considered to be coming from a local user
3988 unless a trusted caller supplies a sender address with -f, or is passing in the
3989 message via SMTP (inetd invocation or otherwise). */
3991 if ((sender_address == NULL && !smtp_input) ||
3992 (!trusted_caller && filter_test == FTEST_NONE))
3994 sender_local = TRUE;
3996 /* A trusted caller can supply authenticated_sender and authenticated_id
3997 via -oMas and -oMai and if so, they will already be set. */
3999 if (authenticated_sender == NULL)
4000 authenticated_sender = string_sprintf("%s@%s", originator_login,
4001 qualify_domain_sender);
4002 if (authenticated_id == NULL) authenticated_id = originator_login;
4005 /* Trusted callers are always permitted to specify the sender address.
4006 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4007 is specified is the empty address. However, if a trusted caller does not
4008 specify a sender address for SMTP input, we leave sender_address unset. This
4009 causes the MAIL commands to be honoured. */
4011 if ((!smtp_input && sender_address == NULL) ||
4012 !receive_check_set_sender(sender_address))
4014 /* Either the caller is not permitted to set a general sender, or this is
4015 non-SMTP input and the trusted caller has not set a sender. If there is no
4016 sender, or if a sender other than <> is set, override with the originator's
4017 login (which will get qualified below), except when checking things. */
4019 if (sender_address == NULL /* No sender_address set */
4021 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4022 !checking && /* Not running tests, AND */
4023 filter_test == FTEST_NONE)) /* Not testing a filter */
4025 sender_address = originator_login;
4026 sender_address_forced = FALSE;
4027 sender_address_domain = 0;
4031 /* Remember whether an untrusted caller set the sender address */
4033 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4035 /* Ensure that the sender address is fully qualified unless it is the empty
4036 address, which indicates an error message, or doesn't exist (root caller, smtp
4037 interface, no -f argument). */
4039 if (sender_address != NULL && sender_address[0] != 0 &&
4040 sender_address_domain == 0)
4041 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4042 qualify_domain_sender);
4044 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4046 /* Handle a request to verify a list of addresses, or test them for delivery.
4047 This must follow the setting of the sender address, since routers can be
4048 predicated upon the sender. If no arguments are given, read addresses from
4049 stdin. Set debug_level to at least D_v to get full output for address testing.
4052 if (verify_address_mode || address_test_mode)
4055 int flags = vopt_qualify;
4057 if (verify_address_mode)
4059 if (!verify_as_sender) flags |= vopt_is_recipient;
4060 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4065 flags |= vopt_is_recipient;
4066 debug_selector |= D_v;
4067 debug_file = stderr;
4068 debug_fd = fileno(debug_file);
4069 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4072 if (recipients_arg < argc)
4074 while (recipients_arg < argc)
4076 uschar *s = argv[recipients_arg++];
4079 BOOL finished = FALSE;
4080 uschar *ss = parse_find_address_end(s, FALSE);
4081 if (*ss == ',') *ss = 0; else finished = TRUE;
4082 test_address(s, flags, &exit_value);
4085 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4092 uschar *s = get_stdinput(NULL, NULL);
4093 if (s == NULL) break;
4094 test_address(s, flags, &exit_value);
4098 exim_exit(exit_value);
4101 /* Handle expansion checking */
4105 if (recipients_arg < argc)
4107 while (recipients_arg < argc)
4109 uschar *s = argv[recipients_arg++];
4110 uschar *ss = expand_string(s);
4112 printf ("Failed: %s\n", expand_string_message);
4113 else printf("%s\n", CS ss);
4121 char *(*fn_readline)(char *) = NULL;
4122 char *(*fn_addhist)(char *) = NULL;
4125 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4131 uschar *source = get_stdinput(fn_readline, fn_addhist);
4132 if (source == NULL) break;
4133 ss = expand_string(source);
4135 printf ("Failed: %s\n", expand_string_message);
4136 else printf("%s\n", CS ss);
4140 if (dlhandle != NULL) dlclose(dlhandle);
4144 exim_exit(EXIT_SUCCESS);
4148 /* The active host name is normally the primary host name, but it can be varied
4149 for hosts that want to play several parts at once. We need to ensure that it is
4150 set for host checking, and for receiving messages. */
4152 smtp_active_hostname = primary_hostname;
4153 if (raw_active_hostname != NULL)
4155 uschar *nah = expand_string(raw_active_hostname);
4158 if (!expand_string_forcedfail)
4159 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4160 "(smtp_active_hostname): %s", raw_active_hostname,
4161 expand_string_message);
4163 else if (nah[0] != 0) smtp_active_hostname = nah;
4166 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4167 given IP address so that the blocking and relay configuration can be tested. An
4168 RFC 1413 call is made only if we are running in the test harness and an
4169 incoming interface and both ports are specified, because there is no TCP/IP
4170 call to find the ident for. */
4177 sender_ident = NULL;
4178 if (running_in_test_harness && sender_host_port != 0 &&
4179 interface_address != NULL && interface_port != 0)
4180 verify_get_ident(1413);
4182 /* In case the given address is a non-canonical IPv6 address, canonicize
4183 it. The code works for both IPv4 and IPv6, as it happens. */
4185 size = host_aton(sender_host_address, x);
4186 sender_host_address = store_get(48); /* large enough for full IPv6 */
4187 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4189 /* Now set up for testing */
4191 host_build_sender_fullhost();
4195 sender_local = FALSE;
4196 sender_host_notsocket = TRUE;
4197 debug_file = stderr;
4198 debug_fd = fileno(debug_file);
4199 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4200 "**** but without any ident (RFC 1413) callback.\n"
4201 "**** This is not for real!\n\n",
4202 sender_host_address);
4204 if (verify_check_host(&hosts_connection_nolog) == OK)
4205 log_write_selector &= ~L_smtp_connection;
4206 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4208 if (smtp_start_session())
4210 reset_point = store_get(0);
4213 store_reset(reset_point);
4214 if (smtp_setup_msg() <= 0) break;
4215 if (!receive_msg(FALSE)) break;
4218 exim_exit(EXIT_SUCCESS);
4222 /* Arrange for message reception if recipients or SMTP were specified;
4223 otherwise complain unless a version print (-bV) happened or this is a filter
4224 verification test. In the former case, show the configuration file name. */
4226 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4228 if (version_printed)
4230 printf("Configuration file is %s\n", config_main_filename);
4231 return EXIT_SUCCESS;
4233 if (filter_test == FTEST_NONE)
4236 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4237 "not directly from a shell command line. Options and/or arguments control\n"
4238 "what it does when called. For a list of options, see the Exim documentation.\n");
4239 return EXIT_FAILURE;
4244 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4245 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4246 that we are not called from inetd, because that is rejected above. The
4247 following configuration settings are forced here:
4249 (1) Synchronous delivery (-odi)
4250 (2) Errors to stderr (-oep == -oeq)
4251 (3) No parallel remote delivery
4252 (4) Unprivileged delivery
4254 We don't force overall queueing options because there are several of them;
4255 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4256 to override any SMTP queueing. */
4260 synchronous_delivery = TRUE;
4261 arg_error_handling = ERRORS_STDERR;
4262 remote_max_parallel = 1;
4263 deliver_drop_privilege = TRUE;
4265 queue_smtp_domains = NULL;
4269 /* Prepare to accept one or more new messages on the standard input. When a
4270 message has been read, its id is returned in message_id[]. If doing immediate
4271 delivery, we fork a delivery process for each received message, except for the
4272 last one, where we can save a process switch.
4274 It is only in non-smtp mode that error_handling is allowed to be changed from
4275 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4276 sendmail error modes other than -oem ever actually used? Later: yes.) */
4278 if (!smtp_input) error_handling = arg_error_handling;
4280 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4281 logging being sent down the socket and make an identd call to get the
4286 (void)fclose(stderr);
4287 exim_nullstd(); /* Re-open to /dev/null */
4288 verify_get_ident(IDENT_PORT);
4289 host_build_sender_fullhost();
4290 set_process_info("handling incoming connection from %s via inetd",
4294 /* If the sender host address has been set, build sender_fullhost if it hasn't
4295 already been done (which it will have been for inetd). This caters for the
4296 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4297 so that the test for IP options is skipped for -bs input. */
4299 if (sender_host_address != NULL && sender_fullhost == NULL)
4301 host_build_sender_fullhost();
4302 set_process_info("handling incoming connection from %s via -oMa",
4304 sender_host_notsocket = TRUE;
4307 /* Otherwise, set the sender host as unknown except for inetd calls. This
4308 prevents host checking in the case of -bs not from inetd and also for -bS. */
4310 else if (!is_inetd) sender_host_unknown = TRUE;
4312 /* If stdout does not exist, then dup stdin to stdout. This can happen
4313 if exim is started from inetd. In this case fd 0 will be set to the socket,
4314 but fd 1 will not be set. This also happens for passed SMTP channels. */
4316 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4318 /* Set up the incoming protocol name and the state of the program. Root
4319 is allowed to force received protocol via the -oMr option above, and if we are
4320 in a non-local SMTP state it means we have come via inetd and the process info
4321 has already been set up. We don't set received_protocol here for smtp input,
4322 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4326 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4331 if (received_protocol == NULL)
4332 received_protocol = string_sprintf("local%s", called_as);
4333 set_process_info("accepting a local non-SMTP message from <%s>",
4337 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4341 local_queue_only = queue_only;
4343 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4344 the spool if so configured. On failure, we must not attempt to send an error
4345 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4346 error code is given.) */
4348 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4350 fprintf(stderr, "exim: insufficient disk space\n");
4351 return EXIT_FAILURE;
4354 /* If this is smtp input of any kind, handle the start of the SMTP
4361 if (verify_check_host(&hosts_connection_nolog) == OK)
4362 log_write_selector &= ~L_smtp_connection;
4363 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4364 if (!smtp_start_session())
4367 exim_exit(EXIT_SUCCESS);
4371 /* Otherwise, set up the input size limit here */
4375 thismessage_size_limit = expand_string_integer(message_size_limit);
4376 if (thismessage_size_limit < 0)
4378 if (thismessage_size_limit == -1)
4379 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4380 "message_size_limit: %s", expand_string_message);
4382 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4383 "message_size_limit: %s", expand_string_message);
4387 /* Loop for several messages when reading SMTP input. If we fork any child
4388 processes, we don't want to wait for them unless synchronous delivery is
4389 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4390 same as SIG_DFL, despite the fact that documentation often lists the default as
4391 "ignore". This is a confusing area. This is what I know:
4393 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4394 processes that complete simply to go away without ever becoming defunct. You
4395 can't then wait for them - but we don't want to wait for them in the
4396 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4397 happen for all OS (e.g. *BSD is different).
4399 But that's not the end of the story. Some (many? all?) systems have the
4400 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4401 has by default, so it seems that the difference is merely one of default
4402 (compare restarting vs non-restarting signals).
4404 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4405 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4406 of the loop below. Paranoia rules.
4408 February 2003: That's *still* not the end of the story. There are now versions
4409 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4410 process then calls waitpid(), a grumble is written to the system log, because
4411 this is logically inconsistent. In other words, it doesn't like the paranoia.
4412 As a consequenc of this, the waitpid() below is now excluded if we are sure
4413 that SIG_IGN works. */
4415 if (!synchronous_delivery)
4418 struct sigaction act;
4419 act.sa_handler = SIG_IGN;
4420 sigemptyset(&(act.sa_mask));
4421 act.sa_flags = SA_NOCLDWAIT;
4422 sigaction(SIGCHLD, &act, NULL);
4424 signal(SIGCHLD, SIG_IGN);
4428 /* Save the current store pool point, for resetting at the start of
4429 each message, and save the real sender address, if any. */
4431 reset_point = store_get(0);
4432 real_sender_address = sender_address;
4434 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4435 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4440 store_reset(reset_point);
4443 /* In the SMTP case, we have to handle the initial SMTP input and build the
4444 recipients list, before calling receive_msg() to read the message proper.
4445 Whatever sender address is actually given in the SMTP transaction is
4446 actually ignored for local senders - we use the actual sender, which is
4447 normally either the underlying user running this process or a -f argument
4448 provided by a trusted caller. It is saved in real_sender_address.
4450 However, if this value is NULL, we are dealing with a trusted caller when
4451 -f was not used; in this case, the SMTP sender is allowed to stand.
4453 Also, if untrusted_set_sender is set, we permit sender addresses that match
4454 anything in its list.
4456 The variable raw_sender_address holds the sender address before rewriting. */
4461 if ((rc = smtp_setup_msg()) > 0)
4463 if (real_sender_address != NULL &&
4464 !receive_check_set_sender(sender_address))
4466 sender_address = raw_sender = real_sender_address;
4467 sender_address_unrewritten = NULL;
4469 more = receive_msg(extract_recipients);
4470 if (message_id[0] == 0)
4473 exim_exit(EXIT_FAILURE);
4476 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4479 /* In the non-SMTP case, we have all the information from the command
4480 line, but must process it in case it is in the more general RFC822
4481 format, and in any case, to detect syntax errors. Also, it appears that
4482 the use of comma-separated lists as single arguments is common, so we
4483 had better support them. */
4489 int count = argc - recipients_arg;
4490 uschar **list = argv + recipients_arg;
4492 /* These options cannot be changed dynamically for non-SMTP messages */
4494 active_local_sender_retain = local_sender_retain;
4495 active_local_from_check = local_from_check;
4497 /* Save before any rewriting */
4499 raw_sender = string_copy(sender_address);
4501 /* Loop for each argument */
4503 for (i = 0; i < count; i++)
4505 int start, end, domain;
4507 uschar *s = list[i];
4509 /* Loop for each comma-separated address */
4513 BOOL finished = FALSE;
4515 uschar *ss = parse_find_address_end(s, FALSE);
4517 if (*ss == ',') *ss = 0; else finished = TRUE;
4519 /* Check max recipients - if -t was used, these aren't recipients */
4521 if (recipients_max > 0 && ++rcount > recipients_max &&
4522 !extract_recipients)
4524 if (error_handling == ERRORS_STDERR)
4526 fprintf(stderr, "exim: too many recipients\n");
4527 exim_exit(EXIT_FAILURE);
4532 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4533 errors_sender_rc : EXIT_FAILURE;
4538 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4540 if (domain == 0 && !allow_unqualified_recipient)
4543 errmess = US"unqualified recipient address not allowed";
4546 if (recipient == NULL)
4548 if (error_handling == ERRORS_STDERR)
4550 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4551 string_printing(list[i]), errmess);
4552 exim_exit(EXIT_FAILURE);
4558 eblock.text1 = string_printing(list[i]);
4559 eblock.text2 = errmess;
4561 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4562 errors_sender_rc : EXIT_FAILURE;
4566 receive_add_recipient(recipient, -1);
4569 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4573 /* Show the recipients when debugging */
4578 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4579 if (recipients_list != NULL)
4581 debug_printf("Recipients:\n");
4582 for (i = 0; i < recipients_count; i++)
4583 debug_printf(" %s\n", recipients_list[i].address);
4587 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4588 will just read the headers for the message, and not write anything onto the
4591 message_ended = END_NOTENDED;
4592 more = receive_msg(extract_recipients);
4594 /* more is always FALSE here (not SMTP message) when reading a message
4595 for real; when reading the headers of a message for filter testing,
4596 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4598 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4599 } /* Non-SMTP message reception */
4601 /* If this is a filter testing run, there are headers in store, but
4602 no message on the spool. Run the filtering code in testing mode, setting
4603 the domain to the qualify domain and the local part to the current user,
4604 unless they have been set by options. The prefix and suffix are left unset
4605 unless specified. The the return path is set to to the sender unless it has
4606 already been set from a return-path header in the message. */
4608 if (filter_test != FTEST_NONE)
4610 deliver_domain = (ftest_domain != NULL)?
4611 ftest_domain : qualify_domain_recipient;
4612 deliver_domain_orig = deliver_domain;
4613 deliver_localpart = (ftest_localpart != NULL)?
4614 ftest_localpart : originator_login;
4615 deliver_localpart_orig = deliver_localpart;
4616 deliver_localpart_prefix = ftest_prefix;
4617 deliver_localpart_suffix = ftest_suffix;
4618 deliver_home = originator_home;
4620 if (return_path == NULL)
4622 printf("Return-path copied from sender\n");
4623 return_path = string_copy(sender_address);
4627 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4629 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4631 receive_add_recipient(
4632 string_sprintf("%s%s%s@%s",
4633 (ftest_prefix == NULL)? US"" : ftest_prefix,
4635 (ftest_suffix == NULL)? US"" : ftest_suffix,
4636 deliver_domain), -1);
4638 printf("Recipient = %s\n", recipients_list[0].address);
4639 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4640 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4642 (void)chdir("/"); /* Get away from wherever the user is running this from */
4644 /* Now we run either a system filter test, or a user filter test, or both.
4645 In the latter case, headers added by the system filter will persist and be
4646 available to the user filter. We need to copy the filter variables
4649 if ((filter_test & FTEST_SYSTEM) != 0)
4651 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4652 exim_exit(EXIT_FAILURE);
4655 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4657 if ((filter_test & FTEST_USER) != 0)
4659 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4660 exim_exit(EXIT_FAILURE);
4663 exim_exit(EXIT_SUCCESS);
4666 /* Else act on the result of message reception. We should not get here unless
4667 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4668 TRUE. If it is not, check on the number of messages received in this
4669 connection. If that's OK and queue_only_load is set, check that the load
4670 average is below it. If it is not, set local_queue_only TRUE. Note that it
4671 then remains this way for any subsequent messages on the same SMTP connection.
4672 This is a deliberate choice; even though the load average may fall, it
4673 doesn't seem right to deliver later messages on the same call when not
4674 delivering earlier ones. */
4676 if (!local_queue_only)
4678 if (smtp_accept_queue_per_connection > 0 &&
4679 receive_messagecount > smtp_accept_queue_per_connection)
4681 local_queue_only = TRUE;
4682 queue_only_reason = 2;
4684 else if (queue_only_load >= 0)
4686 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4687 if (local_queue_only) queue_only_reason = 3;
4691 /* If running as an MUA wrapper, all queueing options and freezing options
4695 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4697 /* Log the queueing here, when it will get a message id attached, but
4698 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4701 if (local_queue_only) switch(queue_only_reason)
4704 log_write(L_delay_delivery,
4705 LOG_MAIN, "no immediate delivery: more than %d messages "
4706 "received in one connection", smtp_accept_queue_per_connection);
4710 log_write(L_delay_delivery,
4711 LOG_MAIN, "no immediate delivery: load average %.2f",
4712 (double)load_average/1000.0);
4716 /* Else do the delivery unless the ACL or local_scan() called for queue only
4717 or froze the message. Always deliver in a separate process. A fork failure is
4718 not a disaster, as the delivery will eventually happen on a subsequent queue
4719 run. The search cache must be tidied before the fork, as the parent will
4720 do it before exiting. The child will trigger a lookup failure and
4721 thereby defer the delivery if it tries to use (for example) a cached ldap
4722 connection that the parent has called unbind on. */
4724 else if (!queue_only_policy && !deliver_freeze)
4729 if ((pid = fork()) == 0)
4732 close_unwanted(); /* Close unwanted file descriptors and TLS */
4733 exim_nullstd(); /* Ensure std{in,out,err} exist */
4735 /* Occasionally in the test harness we don't have synchronous delivery
4736 set (can happen with bounces). In that case, let the old process finish
4737 before continuing, to keep the debug output the same. */
4739 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4741 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4742 mode, deliver_drop_privilege is forced TRUE). */
4744 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4746 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4748 /* Control does not return here. */
4751 /* No need to re-exec */
4753 rc = deliver_message(message_id, FALSE, FALSE);
4755 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4756 EXIT_SUCCESS : EXIT_FAILURE);
4761 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4762 "process: %s", strerror(errno));
4765 /* In the parent, wait if synchronous delivery is required. This will
4766 always be the case in MUA wrapper mode. */
4768 else if (synchronous_delivery)
4771 while (wait(&status) != pid);
4772 if ((status & 0x00ff) != 0)
4773 log_write(0, LOG_MAIN|LOG_PANIC,
4774 "process %d crashed with signal %d while delivering %s",
4775 (int)pid, status & 0x00ff, message_id);
4776 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4780 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4781 automatically reaps children (see comments above the loop), clear away any
4782 finished subprocesses here, in case there are lots of messages coming in
4783 from the same source. */
4785 #ifndef SIG_IGN_WORKS
4786 while (waitpid(-1, NULL, WNOHANG) > 0);
4790 exim_exit(EXIT_SUCCESS); /* Never returns */
4791 return 0; /* To stop compiler warning */