1 /* $Cambridge: exim/src/src/exim.c,v 1.31 2006/02/07 11:19:00 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2006 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
402 for (i = 0; i <= 2; i++)
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) (void)dup2(devnull, i);
412 if (devnull > 2) (void)close(devnull);
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
441 Exception: We do want it for synchronous delivery!
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
460 tls_close(FALSE); /* Shut down the TLS library */
462 (void)close(fileno(smtp_in));
463 (void)close(fileno(smtp_out));
468 (void)close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address, and terminates it before the
590 port data when a port is extracted.
593 address the address, with possible port on the end
595 Returns: the port, or zero if there isn't one
596 bombs out on a syntax error
600 check_port(uschar *address)
602 int port = host_address_extract_port(address);
603 if (string_is_ip_address(address, NULL) == 0)
605 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
613 /*************************************************
614 * Test/verify an address *
615 *************************************************/
617 /* This function is called by the -bv and -bt code. It extracts a working
618 address from a full RFC 822 address. This isn't really necessary per se, but it
619 has the effect of collapsing source routes.
623 flags flag bits for verify_address()
624 exit_value to be set for failures
630 test_address(uschar *s, int flags, int *exit_value)
632 int start, end, domain;
633 uschar *parse_error = NULL;
634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
638 fprintf(stdout, "syntax error: %s\n", parse_error);
643 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
644 -1, -1, NULL, NULL, NULL);
645 if (rc == FAIL) *exit_value = 2;
646 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
652 /*************************************************
653 * Decode bit settings for log/debug *
654 *************************************************/
656 /* This function decodes a string containing bit settings in the form of +name
657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
658 also recognizes a numeric setting of the form =<number>, but this is not
659 intended for user use. It's an easy way for Exim to pass the debug settings
660 when it is re-exec'ed.
662 The log options are held in two unsigned ints (because there became too many
663 for one). The top bit in the table means "put in 2nd selector". This does not
664 yet apply to debug options, so the "=" facility sets only the first selector.
666 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
667 It sets all the bits in both selectors. However, there is a facility for then
668 unsetting certain bits, because we want to turn off "memory" in the debug case.
670 A bad value for a debug setting is treated as an unknown option - error message
671 to stderr and die. For log settings, which come from the configuration file,
672 we write to the log on the way out...
675 selector1 address of the first bit string
676 selector2 address of the second bit string, or NULL
677 notall1 bits to exclude from "all" for selector1
678 notall2 bits to exclude from "all" for selector2
679 string the configured string
680 options the table of option names
682 which "log" or "debug"
684 Returns: nothing on success - bomb out on failure
688 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
689 int notall2, uschar *string, bit_table *options, int count, uschar *which)
692 if (string == NULL) return;
696 char *end; /* Not uschar */
697 *selector1 = strtoul(CS string+1, &end, 0);
698 if (*end == 0) return;
699 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
704 /* Handle symbolic setting */
711 bit_table *start, *end;
713 while (isspace(*string)) string++;
714 if (*string == 0) return;
716 if (*string != '+' && *string != '-')
718 errmsg = string_sprintf("malformed %s_selector setting: "
719 "+ or - expected but found \"%s\"", which, string);
723 adding = *string++ == '+';
725 while (isalnum(*string) || *string == '_') string++;
729 end = options + count;
733 bit_table *middle = start + (end - start)/2;
734 int c = Ustrncmp(s, middle->name, len);
737 if (middle->name[len] != 0) c = -1; else
739 unsigned int bit = middle->bit;
740 unsigned int *selector;
742 /* The value with all bits set means "force all bits in both selectors"
743 in the case where two are being handled. However, the top bit in the
744 second selector is never set. When setting, some bits can be excluded.
747 if (bit == 0xffffffff)
751 *selector1 = 0xffffffff ^ notall1;
752 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
757 if (selector2 != NULL) *selector2 = 0;
761 /* Otherwise, the 0x80000000 bit means "this value, without the top
762 bit, belongs in the second selector". */
766 if ((bit & 0x80000000) != 0)
768 selector = selector2;
771 else selector = selector1;
772 if (adding) *selector |= bit; else *selector &= ~bit;
774 break; /* Out of loop to match selector name */
777 if (c < 0) end = middle; else start = middle + 1;
778 } /* Loop to match selector name */
782 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
783 adding? '+' : '-', len, s);
786 } /* Loop for selector names */
788 /* Handle disasters */
791 if (Ustrcmp(which, "debug") == 0)
793 fprintf(stderr, "exim: %s\n", errmsg);
796 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
801 /*************************************************
802 * Show supported features *
803 *************************************************/
805 /* This function is called for -bV and for -d to output the optional features
806 of the current Exim binary.
808 Arguments: a FILE for printing
813 show_whats_supported(FILE *f)
815 #ifdef DB_VERSION_STRING
816 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
817 #elif defined(BTREEVERSION) && defined(HASHVERSION)
819 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
821 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
823 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
824 fprintf(f, "Probably ndbm\n");
825 #elif defined(USE_TDB)
826 fprintf(f, "Using tdb\n");
829 fprintf(f, "Probably GDBM (native mode)\n");
831 fprintf(f, "Probably GDBM (compatibility mode)\n");
835 fprintf(f, "Support for:");
836 #ifdef SUPPORT_CRYPTEQ
837 fprintf(f, " crypteq");
840 fprintf(f, " iconv()");
852 fprintf(f, " Expand_dlfunc");
854 #ifdef USE_TCP_WRAPPERS
855 fprintf(f, " TCPwrappers");
859 fprintf(f, " GnuTLS");
861 fprintf(f, " OpenSSL");
864 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
865 fprintf(f, " translate_ip_address");
867 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
868 fprintf(f, " move_frozen_messages");
870 #ifdef WITH_CONTENT_SCAN
871 fprintf(f, " Content_Scanning");
873 #ifdef WITH_OLD_DEMIME
874 fprintf(f, " Old_Demime");
876 #ifdef EXPERIMENTAL_SPF
877 fprintf(f, " Experimental_SPF");
879 #ifdef EXPERIMENTAL_SRS
880 fprintf(f, " Experimental_SRS");
882 #ifdef EXPERIMENTAL_BRIGHTMAIL
883 fprintf(f, " Experimental_Brightmail");
885 #ifdef EXPERIMENTAL_DOMAINKEYS
886 fprintf(f, " Experimental_DomainKeys");
890 fprintf(f, "Lookups:");
891 #ifdef LOOKUP_LSEARCH
892 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
898 fprintf(f, " dbm dbmnz");
901 fprintf(f, " dnsdb");
903 #ifdef LOOKUP_DSEARCH
904 fprintf(f, " dsearch");
907 fprintf(f, " ibase");
910 fprintf(f, " ldap ldapdn ldapm");
913 fprintf(f, " mysql");
916 fprintf(f, " nis nis0");
918 #ifdef LOOKUP_NISPLUS
919 fprintf(f, " nisplus");
922 fprintf(f, " oracle");
925 fprintf(f, " passwd");
928 fprintf(f, " pgsql");
931 fprintf(f, " sqlite");
934 fprintf(f, " testdb");
937 fprintf(f, " whoson");
941 fprintf(f, "Authenticators:");
943 fprintf(f, " cram_md5");
945 #ifdef AUTH_CYRUS_SASL
946 fprintf(f, " cyrus_sasl");
948 #ifdef AUTH_PLAINTEXT
949 fprintf(f, " plaintext");
956 fprintf(f, "Routers:");
958 fprintf(f, " accept");
960 #ifdef ROUTER_DNSLOOKUP
961 fprintf(f, " dnslookup");
963 #ifdef ROUTER_IPLITERAL
964 fprintf(f, " ipliteral");
966 #ifdef ROUTER_IPLOOKUP
967 fprintf(f, " iplookup");
969 #ifdef ROUTER_MANUALROUTE
970 fprintf(f, " manualroute");
972 #ifdef ROUTER_QUERYPROGRAM
973 fprintf(f, " queryprogram");
975 #ifdef ROUTER_REDIRECT
976 fprintf(f, " redirect");
980 fprintf(f, "Transports:");
981 #ifdef TRANSPORT_APPENDFILE
982 fprintf(f, " appendfile");
983 #ifdef SUPPORT_MAILDIR
984 fprintf(f, "/maildir");
986 #ifdef SUPPORT_MAILSTORE
987 fprintf(f, "/mailstore");
993 #ifdef TRANSPORT_AUTOREPLY
994 fprintf(f, " autoreply");
996 #ifdef TRANSPORT_LMTP
999 #ifdef TRANSPORT_PIPE
1000 fprintf(f, " pipe");
1002 #ifdef TRANSPORT_SMTP
1003 fprintf(f, " smtp");
1007 if (fixed_never_users[0] > 0)
1010 fprintf(f, "Fixed never_users: ");
1011 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1012 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1013 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1020 /*************************************************
1021 * Quote a local part *
1022 *************************************************/
1024 /* This function is used when a sender address or a From: or Sender: header
1025 line is being created from the caller's login, or from an authenticated_id. It
1026 applies appropriate quoting rules for a local part.
1028 Argument: the local part
1029 Returns: the local part, quoted if necessary
1033 local_part_quote(uschar *lpart)
1035 BOOL needs_quote = FALSE;
1040 for (t = lpart; !needs_quote && *t != 0; t++)
1042 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1043 (*t != '.' || t == lpart || t[1] == 0);
1046 if (!needs_quote) return lpart;
1049 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1053 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1056 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1059 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1060 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1061 yield = string_cat(yield, &size, &ptr, nq, 1);
1065 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1073 /*************************************************
1074 * Load readline() functions *
1075 *************************************************/
1077 /* This function is called from testing executions that read data from stdin,
1078 but only when running as the calling user. Currently, only -be does this. The
1079 function loads the readline() function library and passes back the functions.
1080 On some systems, it needs the curses library, so load that too, but try without
1081 it if loading fails. All this functionality has to be requested at build time.
1084 fn_readline_ptr pointer to where to put the readline pointer
1085 fn_addhist_ptr pointer to where to put the addhistory function
1087 Returns: the dlopen handle or NULL on failure
1091 set_readline(char * (**fn_readline_ptr)(char *),
1092 char * (**fn_addhist_ptr)(char *))
1095 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1097 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1098 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1100 if (dlhandle != NULL)
1102 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1103 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1107 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1116 /*************************************************
1117 * Get a line from stdin for testing things *
1118 *************************************************/
1120 /* This function is called when running tests that can take a number of lines
1121 of input (for example, -be and -bt). It handles continuations and trailing
1122 spaces. And prompting and a blank line output on eof. If readline() is in use,
1123 the arguments are non-NULL and provide the relevant functions.
1126 fn_readline readline function or NULL
1127 fn_addhist addhist function or NULL
1129 Returns: pointer to dynamic memory, or NULL at end of file
1133 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1138 uschar *yield = NULL;
1140 if (fn_readline == NULL) printf("> ");
1144 uschar buffer[1024];
1148 char *readline_line = NULL;
1149 if (fn_readline != NULL)
1151 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1152 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1153 p = US readline_line;
1158 /* readline() not in use */
1161 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1165 /* Handle the line */
1167 ss = p + (int)Ustrlen(p);
1168 while (ss > p && isspace(ss[-1])) ss--;
1172 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1175 yield = string_cat(yield, &size, &ptr, p, ss - p);
1178 if (fn_readline != NULL) free(readline_line);
1181 if (ss == p || yield[ptr-1] != '\\')
1189 if (yield == NULL) printf("\n");
1195 /*************************************************
1196 * Entry point and high-level code *
1197 *************************************************/
1199 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1200 the appropriate action. All the necessary functions are present in the one
1201 binary. I originally thought one should split it up, but it turns out that so
1202 much of the apparatus is needed in each chunk that one might as well just have
1203 it all available all the time, which then makes the coding easier as well.
1206 argc count of entries in argv
1207 argv argument strings, with argv[0] being the program name
1209 Returns: EXIT_SUCCESS if terminated successfully
1210 EXIT_FAILURE otherwise, except when a message has been sent
1211 to the sender, and -oee was given
1215 main(int argc, char **cargv)
1217 uschar **argv = USS cargv;
1218 int arg_receive_timeout = -1;
1219 int arg_smtp_receive_timeout = -1;
1220 int arg_error_handling = error_handling;
1221 int filter_sfd = -1;
1222 int filter_ufd = -1;
1225 int list_queue_option = 0;
1227 int msg_action_arg = -1;
1228 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1229 int queue_only_reason = 0;
1231 int perl_start_option = 0;
1233 int recipients_arg = argc;
1234 int sender_address_domain = 0;
1235 int test_retry_arg = -1;
1236 int test_rewrite_arg = -1;
1237 BOOL arg_queue_only = FALSE;
1238 BOOL bi_option = FALSE;
1239 BOOL checking = FALSE;
1240 BOOL count_queue = FALSE;
1241 BOOL expansion_test = FALSE;
1242 BOOL extract_recipients = FALSE;
1243 BOOL forced_delivery = FALSE;
1244 BOOL f_end_dot = FALSE;
1245 BOOL deliver_give_up = FALSE;
1246 BOOL list_queue = FALSE;
1247 BOOL list_options = FALSE;
1248 BOOL local_queue_only;
1250 BOOL one_msg_action = FALSE;
1251 BOOL queue_only_set = FALSE;
1252 BOOL receiving_message = TRUE;
1254 BOOL removed_privilege = FALSE;
1255 BOOL verify_address_mode = FALSE;
1256 BOOL verify_as_sender = FALSE;
1257 BOOL version_printed = FALSE;
1258 uschar *alias_arg = NULL;
1259 uschar *called_as = US"";
1260 uschar *start_queue_run_id = NULL;
1261 uschar *stop_queue_run_id = NULL;
1262 uschar *ftest_domain = NULL;
1263 uschar *ftest_localpart = NULL;
1264 uschar *ftest_prefix = NULL;
1265 uschar *ftest_suffix = NULL;
1266 uschar *real_sender_address;
1267 uschar *originator_home = US"/";
1271 struct stat statbuf;
1272 pid_t passed_qr_pid = (pid_t)0;
1273 int passed_qr_pipe = -1;
1274 gid_t group_list[NGROUPS_MAX];
1276 /* Possible options for -R and -S */
1278 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1280 /* Need to define this in case we need to change the environment in order
1281 to get rid of a bogus time zone. We have to make it char rather than uschar
1282 because some OS define it in /usr/include/unistd.h. */
1284 extern char **environ;
1286 /* If the Exim user and/or group and/or the configuration file owner/group were
1287 defined by ref:name at build time, we must now find the actual uid/gid values.
1288 This is a feature to make the lives of binary distributors easier. */
1290 #ifdef EXIM_USERNAME
1291 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1293 exim_gid = pw->pw_gid;
1297 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1303 #ifdef EXIM_GROUPNAME
1304 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1306 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1312 #ifdef CONFIGURE_OWNERNAME
1313 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1315 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1316 CONFIGURE_OWNERNAME);
1321 #ifdef CONFIGURE_GROUPNAME
1322 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1324 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1325 CONFIGURE_GROUPNAME);
1330 /* In the Cygwin environment, some initialization needs doing. It is fudged
1331 in by means of this macro. */
1337 /* Check a field which is patched when we are running Exim within its
1338 testing harness; do a fast initial check, and then the whole thing. */
1340 running_in_test_harness =
1341 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1343 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1344 at the start of a program; however, it seems that some environments do not
1345 follow this. A "strange" locale can affect the formatting of timestamps, so we
1348 setlocale(LC_ALL, "C");
1350 /* Set up the default handler for timing using alarm(). */
1352 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1354 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1355 because store_malloc writes a log entry on failure. */
1357 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1358 if (log_buffer == NULL)
1360 fprintf(stderr, "exim: failed to get store for log buffer\n");
1364 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1365 NULL when the daemon is run and the file is closed. We have to use this
1366 indirection, because some systems don't allow writing to the variable "stderr".
1369 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1371 /* Arrange for the PCRE regex library to use our store functions. Note that
1372 the normal calls are actually macros that add additional arguments for
1373 debugging purposes so we have to assign specially constructed functions here.
1374 The default is to use store in the stacking pool, but this is overridden in the
1375 regex_must_compile() function. */
1377 pcre_malloc = function_store_get;
1378 pcre_free = function_dummy_free;
1380 /* Ensure there is a big buffer for temporary use in several places. It is put
1381 in malloc store so that it can be freed for enlargement if necessary. */
1383 big_buffer = store_malloc(big_buffer_size);
1385 /* Set up the handler for the data request signal, and set the initial
1386 descriptive text. */
1388 set_process_info("initializing");
1389 os_restarting_signal(SIGUSR1, usr1_handler);
1391 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1392 in the daemon code. For the rest of Exim's uses, we ignore it. */
1394 signal(SIGHUP, SIG_IGN);
1396 /* We don't want to die on pipe errors as the code is written to handle
1397 the write error instead. */
1399 signal(SIGPIPE, SIG_IGN);
1401 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1402 set to SIG_IGN. This causes subprocesses that complete before the parent
1403 process waits for them not to hang around, so when Exim calls wait(), nothing
1404 is there. The wait() code has been made robust against this, but let's ensure
1405 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1406 ending status. We use sigaction rather than plain signal() on those OS where
1407 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1408 problem on AIX with this.) */
1412 struct sigaction act;
1413 act.sa_handler = SIG_DFL;
1414 sigemptyset(&(act.sa_mask));
1416 sigaction(SIGCHLD, &act, NULL);
1419 signal(SIGCHLD, SIG_DFL);
1422 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1427 /* Set up the version number. Set up the leading 'E' for the external form of
1428 message ids, set the pointer to the internal form, and initialize it to
1429 indicate no message being processed. */
1432 message_id_option[0] = '-';
1433 message_id_external = message_id_option + 1;
1434 message_id_external[0] = 'E';
1435 message_id = message_id_external + 1;
1438 /* Set the umask to zero so that any files that Exim creates are created
1439 with the modes that it specifies. */
1443 /* Precompile the regular expression for matching a message id. Keep this in
1444 step with the code that generates ids in the accept.c module. We need to do
1445 this here, because the -M options check their arguments for syntactic validity
1446 using mac_ismsgid, which uses this. */
1449 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1451 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1452 this seems to be a generally accepted convention, since one finds symbolic
1453 links called "mailq" in standard OS configurations. */
1455 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1456 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1459 receiving_message = FALSE;
1460 called_as = US"-mailq";
1463 /* If the program is called as "rmail" treat it as equivalent to
1464 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1465 i.e. preventing a single dot on a line from terminating the message, and
1466 returning with zero return code, even in cases of error (provided an error
1467 message has been sent). */
1469 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1470 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1473 called_as = US"-rmail";
1474 errors_sender_rc = EXIT_SUCCESS;
1477 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1478 this is a smail convention. */
1480 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1481 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1483 smtp_input = smtp_batched_input = TRUE;
1484 called_as = US"-rsmtp";
1487 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1488 this is a smail convention. */
1490 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1491 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1494 receiving_message = FALSE;
1495 called_as = US"-runq";
1498 /* If the program is called as "newaliases" treat it as equivalent to
1499 "exim -bi"; this is a sendmail convention. */
1501 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1502 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1505 receiving_message = FALSE;
1506 called_as = US"-newaliases";
1509 /* Save the original effective uid for a couple of uses later. It should
1510 normally be root, but in some esoteric environments it may not be. */
1512 original_euid = geteuid();
1514 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1515 to be the same as the real ones. This makes a difference only if Exim is setuid
1516 (or setgid) to something other than root, which could be the case in some
1517 special configurations. */
1519 real_uid = getuid();
1520 real_gid = getgid();
1522 if (real_uid == root_uid)
1528 /* If neither the original real uid nor the original euid was root, Exim is
1529 running in an unprivileged state. */
1531 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1533 /* If the first argument is --help, pretend there are no arguments. This will
1534 cause a brief message to be given. */
1536 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1538 /* Scan the program's arguments. Some can be dealt with right away; others are
1539 simply recorded for checking and handling afterwards. Do a high-level switch
1540 on the second character (the one after '-'), to save some effort. */
1542 for (i = 1; i < argc; i++)
1544 BOOL badarg = FALSE;
1545 uschar *arg = argv[i];
1549 /* An argument not starting with '-' is the start of a recipients list;
1550 break out of the options-scanning loop. */
1558 /* An option consistion of -- terminates the options */
1560 if (Ustrcmp(arg, "--") == 0)
1562 recipients_arg = i + 1;
1566 /* Handle flagged options */
1568 switchchar = arg[1];
1571 /* Make all -ex options synonymous with -oex arguments, since that
1572 is assumed by various callers. Also make -qR options synonymous with -R
1573 options, as that seems to be required as well. Allow for -qqR too, and
1574 the same for -S options. */
1576 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1577 Ustrncmp(arg+1, "qR", 2) == 0 ||
1578 Ustrncmp(arg+1, "qS", 2) == 0)
1580 switchchar = arg[2];
1583 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1585 switchchar = arg[3];
1587 queue_2stage = TRUE;
1590 /* Make -r synonymous with -f, since it is a documented alias */
1592 else if (arg[1] == 'r') switchchar = 'f';
1594 /* Make -ov synonymous with -v */
1596 else if (Ustrcmp(arg, "-ov") == 0)
1602 /* High-level switch on active initial letter */
1606 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1607 so has no need of it. */
1610 if (*argrest == 0) i++; /* Skip over the type */
1615 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1617 /* -bd: Run in daemon mode, awaiting SMTP connections.
1618 -bdf: Ditto, but in the foreground.
1621 if (*argrest == 'd')
1623 daemon_listen = TRUE;
1624 if (*(++argrest) == 'f') background_daemon = FALSE;
1625 else if (*argrest != 0) { badarg = TRUE; break; }
1628 /* -be: Run in expansion test mode */
1630 else if (*argrest == 'e')
1631 expansion_test = checking = TRUE;
1633 /* -bF: Run system filter test */
1635 else if (*argrest == 'F')
1637 filter_test |= FTEST_SYSTEM;
1638 if (*(++argrest) != 0) { badarg = TRUE; break; }
1639 if (++i < argc) filter_test_sfile = argv[i]; else
1641 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1646 /* -bf: Run user filter test
1647 -bfd: Set domain for filter testing
1648 -bfl: Set local part for filter testing
1649 -bfp: Set prefix for filter testing
1650 -bfs: Set suffix for filter testing
1653 else if (*argrest == 'f')
1655 if (*(++argrest) == 0)
1657 filter_test |= FTEST_USER;
1658 if (++i < argc) filter_test_ufile = argv[i]; else
1660 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1668 fprintf(stderr, "exim: string expected after %s\n", arg);
1671 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1672 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1673 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1674 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1675 else { badarg = TRUE; break; }
1679 /* -bh: Host checking - an IP address must follow. */
1681 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1683 if (++i >= argc) { badarg = TRUE; break; }
1684 sender_host_address = argv[i];
1685 host_checking = checking = log_testing_mode = TRUE;
1686 host_checking_callout = argrest[1] == 'c';
1689 /* -bi: This option is used by sendmail to initialize *the* alias file,
1690 though it has the -oA option to specify a different file. Exim has no
1691 concept of *the* alias file, but since Sun's YP make script calls
1692 sendmail this way, some support must be provided. */
1694 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1696 /* -bm: Accept and deliver message - the default option. Reinstate
1697 receiving_message, which got turned off for all -b options. */
1699 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1701 /* -bnq: For locally originating messages, do not qualify unqualified
1702 addresses. In the envelope, this causes errors; in header lines they
1705 else if (Ustrcmp(argrest, "nq") == 0)
1707 allow_unqualified_sender = FALSE;
1708 allow_unqualified_recipient = FALSE;
1711 /* -bpxx: List the contents of the mail queue, in various forms. If
1712 the option is -bpc, just a queue count is needed. Otherwise, if the
1713 first letter after p is r, then order is random. */
1715 else if (*argrest == 'p')
1717 if (*(++argrest) == 'c')
1720 if (*(++argrest) != 0) badarg = TRUE;
1724 if (*argrest == 'r')
1726 list_queue_option = 8;
1729 else list_queue_option = 0;
1733 /* -bp: List the contents of the mail queue, top-level only */
1735 if (*argrest == 0) {}
1737 /* -bpu: List the contents of the mail queue, top-level undelivered */
1739 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1741 /* -bpa: List the contents of the mail queue, including all delivered */
1743 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1745 /* Unknown after -bp[r] */
1755 /* -bP: List the configuration variables given as the address list.
1756 Force -v, so configuration errors get displayed. */
1758 else if (Ustrcmp(argrest, "P") == 0)
1760 list_options = TRUE;
1761 debug_selector |= D_v;
1762 debug_file = stderr;
1765 /* -brt: Test retry configuration lookup */
1767 else if (Ustrcmp(argrest, "rt") == 0)
1769 test_retry_arg = i + 1;
1773 /* -brw: Test rewrite configuration */
1775 else if (Ustrcmp(argrest, "rw") == 0)
1777 test_rewrite_arg = i + 1;
1781 /* -bS: Read SMTP commands on standard input, but produce no replies -
1782 all errors are reported by sending messages. */
1784 else if (Ustrcmp(argrest, "S") == 0)
1785 smtp_input = smtp_batched_input = receiving_message = TRUE;
1787 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1788 on standard output. */
1790 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1792 /* -bt: address testing mode */
1794 else if (Ustrcmp(argrest, "t") == 0)
1795 address_test_mode = checking = log_testing_mode = TRUE;
1797 /* -bv: verify addresses */
1799 else if (Ustrcmp(argrest, "v") == 0)
1800 verify_address_mode = checking = log_testing_mode = TRUE;
1802 /* -bvs: verify sender addresses */
1804 else if (Ustrcmp(argrest, "vs") == 0)
1806 verify_address_mode = checking = log_testing_mode = TRUE;
1807 verify_as_sender = TRUE;
1810 /* -bV: Print version string and support details */
1812 else if (Ustrcmp(argrest, "V") == 0)
1814 printf("Exim version %s #%s built %s\n", version_string,
1815 version_cnumber, version_date);
1816 printf("%s\n", CS version_copyright);
1817 version_printed = TRUE;
1818 show_whats_supported(stdout);
1825 /* -C: change configuration file list; ignore if it isn't really
1826 a change! Enforce a prefix check if required. */
1831 if(++i < argc) argrest = argv[i]; else
1832 { badarg = TRUE; break; }
1834 if (Ustrcmp(config_main_filelist, argrest) != 0)
1836 #ifdef ALT_CONFIG_PREFIX
1838 int len = Ustrlen(ALT_CONFIG_PREFIX);
1839 uschar *list = argrest;
1841 while((filename = string_nextinlist(&list, &sep, big_buffer,
1842 big_buffer_size)) != NULL)
1844 if ((Ustrlen(filename) < len ||
1845 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1846 Ustrstr(filename, "/../") != NULL) &&
1847 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1849 fprintf(stderr, "-C Permission denied\n");
1855 config_main_filelist = argrest;
1856 config_changed = TRUE;
1861 /* -D: set up a macro definition */
1864 #ifdef DISABLE_D_OPTION
1865 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1870 macro_item *mlast = NULL;
1873 uschar *s = argrest;
1875 while (isspace(*s)) s++;
1877 if (*s < 'A' || *s > 'Z')
1879 fprintf(stderr, "exim: macro name set by -D must start with "
1880 "an upper case letter\n");
1884 while (isalnum(*s) || *s == '_')
1886 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1890 if (ptr == 0) { badarg = TRUE; break; }
1891 while (isspace(*s)) s++;
1894 if (*s++ != '=') { badarg = TRUE; break; }
1895 while (isspace(*s)) s++;
1898 for (m = macros; m != NULL; m = m->next)
1900 if (Ustrcmp(m->name, name) == 0)
1902 fprintf(stderr, "exim: duplicated -D in command line\n");
1908 m = store_get(sizeof(macro_item) + Ustrlen(name));
1910 m->command_line = TRUE;
1911 if (mlast == NULL) macros = m; else mlast->next = m;
1912 Ustrcpy(m->name, name);
1913 m->replacement = string_copy(s);
1915 if (clmacro_count >= MAX_CLMACROS)
1917 fprintf(stderr, "exim: too many -D options on command line\n");
1920 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1926 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1927 The latter is now a no-op, retained for compatibility only. If -dd is used,
1928 debugging subprocesses of the daemon is disabled. */
1931 if (Ustrcmp(argrest, "ropcr") == 0)
1933 /* drop_cr = TRUE; */
1936 /* Use an intermediate variable so that we don't set debugging while
1937 decoding the debugging bits. */
1941 unsigned int selector = D_default;
1944 if (*argrest == 'd')
1946 debug_daemon = TRUE;
1950 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1951 debug_options_count, US"debug");
1952 debug_selector = selector;
1957 /* -E: This is a local error message. This option is not intended for
1958 external use at all, but is not restricted to trusted callers because it
1959 does no harm (just suppresses certain error messages) and if Exim is run
1960 not setuid root it won't always be trusted when it generates error
1961 messages using this option. If there is a message id following -E, point
1962 message_reference at it, for logging. */
1965 local_error_message = TRUE;
1966 if (mac_ismsgid(argrest)) message_reference = argrest;
1970 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1971 option, so it looks as if historically the -oex options are also callable
1972 without the leading -o. So we have to accept them. Before the switch,
1973 anything starting -oe has been converted to -e. Exim does not support all
1974 of the sendmail error options. */
1977 if (Ustrcmp(argrest, "e") == 0)
1979 arg_error_handling = ERRORS_SENDER;
1980 errors_sender_rc = EXIT_SUCCESS;
1982 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1983 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1984 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1985 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1990 /* -F: Set sender's full name, used instead of the gecos entry from
1991 the password file. Since users can usually alter their gecos entries,
1992 there's no security involved in using this instead. The data can follow
1993 the -F or be in the next argument. */
1998 if(++i < argc) argrest = argv[i]; else
1999 { badarg = TRUE; break; }
2001 originator_name = argrest;
2002 sender_name_forced = TRUE;
2006 /* -f: Set sender's address - this value is only actually used if Exim is
2007 run by a trusted user, or if untrusted_set_sender is set and matches the
2008 address, except that the null address can always be set by any user. The
2009 test for this happens later, when the value given here is ignored when not
2010 permitted. For an untrusted user, the actual sender is still put in Sender:
2011 if it doesn't match the From: header (unless no_local_from_check is set).
2012 The data can follow the -f or be in the next argument. The -r switch is an
2013 obsolete form of -f but since there appear to be programs out there that
2014 use anything that sendmail has ever supported, better accept it - the
2015 synonymizing is done before the switch above.
2017 At this stage, we must allow domain literal addresses, because we don't
2018 know what the setting of allow_domain_literals is yet. Ditto for trailing
2019 dots and strip_trailing_dot. */
2027 if (i+1 < argc) argrest = argv[++i]; else
2028 { badarg = TRUE; break; }
2032 sender_address = string_sprintf(""); /* Ensure writeable memory */
2036 uschar *temp = argrest + Ustrlen(argrest) - 1;
2037 while (temp >= argrest && isspace(*temp)) temp--;
2038 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2039 allow_domain_literals = TRUE;
2040 strip_trailing_dot = TRUE;
2041 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2042 &sender_address_domain, TRUE);
2043 allow_domain_literals = FALSE;
2044 strip_trailing_dot = FALSE;
2045 if (sender_address == NULL)
2047 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2048 return EXIT_FAILURE;
2051 sender_address_forced = TRUE;
2055 /* This is some Sendmail thing which can be ignored */
2060 /* -h: Set the hop count for an incoming message. Exim does not currently
2061 support this; it always computes it by counting the Received: headers.
2062 To put it in will require a change to the spool header file format. */
2067 if(++i < argc) argrest = argv[i]; else
2068 { badarg = TRUE; break; }
2070 if (!isdigit(*argrest)) badarg = TRUE;
2074 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2075 not to be documented for sendmail but mailx (at least) uses it) */
2078 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2083 receiving_message = FALSE;
2085 /* -MC: continue delivery of another message via an existing open
2086 file descriptor. This option is used for an internal call by the
2087 smtp transport when there is a pending message waiting to go to an
2088 address to which it has got a connection. Five subsequent arguments are
2089 required: transport name, host name, IP address, sequence number, and
2090 message_id. Transports may decline to create new processes if the sequence
2091 number gets too big. The channel is stdin. This (-MC) must be the last
2092 argument. There's a subsequent check that the real-uid is privileged.
2094 If we are running in the test harness. delay for a bit, to let the process
2095 that set this one up complete. This makes for repeatability of the logging,
2098 if (Ustrcmp(argrest, "C") == 0)
2102 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2103 return EXIT_FAILURE;
2106 if (msg_action_arg >= 0)
2108 fprintf(stderr, "exim: incompatible arguments\n");
2109 return EXIT_FAILURE;
2112 continue_transport = argv[++i];
2113 continue_hostname = argv[++i];
2114 continue_host_address = argv[++i];
2115 continue_sequence = Uatoi(argv[++i]);
2116 msg_action = MSG_DELIVER;
2117 msg_action_arg = ++i;
2118 forced_delivery = TRUE;
2119 queue_run_pid = passed_qr_pid;
2120 queue_run_pipe = passed_qr_pipe;
2122 if (!mac_ismsgid(argv[i]))
2124 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2126 return EXIT_FAILURE;
2129 if (running_in_test_harness) millisleep(500);
2133 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2134 precedes -MC (see above). The flag indicates that the host to which
2135 Exim is connected has accepted an AUTH sequence. */
2137 else if (Ustrcmp(argrest, "CA") == 0)
2139 smtp_authenticated = TRUE;
2143 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2144 it preceded -MC (see above) */
2146 else if (Ustrcmp(argrest, "CP") == 0)
2148 smtp_use_pipelining = TRUE;
2152 /* -MCQ: pass on the pid of the queue-running process that started
2153 this chain of deliveries and the fd of its synchronizing pipe; this
2154 is useful only when it precedes -MC (see above) */
2156 else if (Ustrcmp(argrest, "CQ") == 0)
2158 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2160 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2165 /* -MCS: set the smtp_use_size flag; this is useful only when it
2166 precedes -MC (see above) */
2168 else if (Ustrcmp(argrest, "CS") == 0)
2170 smtp_use_size = TRUE;
2174 /* -MCT: set the tls_offered flag; this is useful only when it
2175 precedes -MC (see above). The flag indicates that the host to which
2176 Exim is connected has offered TLS support. */
2179 else if (Ustrcmp(argrest, "CT") == 0)
2186 /* -M[x]: various operations on the following list of message ids:
2187 -M deliver the messages, ignoring next retry times and thawing
2188 -Mc deliver the messages, checking next retry times, no thawing
2189 -Mf freeze the messages
2190 -Mg give up on the messages
2191 -Mt thaw the messages
2192 -Mrm remove the messages
2193 In the above cases, this must be the last option. There are also the
2194 following options which are followed by a single message id, and which
2195 act on that message. Some of them use the "recipient" addresses as well.
2196 -Mar add recipient(s)
2197 -Mmad mark all recipients delivered
2198 -Mmd mark recipients(s) delivered
2205 else if (*argrest == 0)
2207 msg_action = MSG_DELIVER;
2208 forced_delivery = deliver_force_thaw = TRUE;
2210 else if (Ustrcmp(argrest, "ar") == 0)
2212 msg_action = MSG_ADD_RECIPIENT;
2213 one_msg_action = TRUE;
2215 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2216 else if (Ustrcmp(argrest, "es") == 0)
2218 msg_action = MSG_EDIT_SENDER;
2219 one_msg_action = TRUE;
2221 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2222 else if (Ustrcmp(argrest, "g") == 0)
2224 msg_action = MSG_DELIVER;
2225 deliver_give_up = TRUE;
2227 else if (Ustrcmp(argrest, "mad") == 0)
2229 msg_action = MSG_MARK_ALL_DELIVERED;
2231 else if (Ustrcmp(argrest, "md") == 0)
2233 msg_action = MSG_MARK_DELIVERED;
2234 one_msg_action = TRUE;
2236 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2237 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2238 else if (Ustrcmp(argrest, "vb") == 0)
2240 msg_action = MSG_SHOW_BODY;
2241 one_msg_action = TRUE;
2243 else if (Ustrcmp(argrest, "vh") == 0)
2245 msg_action = MSG_SHOW_HEADER;
2246 one_msg_action = TRUE;
2248 else if (Ustrcmp(argrest, "vl") == 0)
2250 msg_action = MSG_SHOW_LOG;
2251 one_msg_action = TRUE;
2253 else { badarg = TRUE; break; }
2255 /* All the -Mxx options require at least one message id. */
2257 msg_action_arg = i + 1;
2258 if (msg_action_arg >= argc)
2260 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2261 return EXIT_FAILURE;
2264 /* Some require only message ids to follow */
2266 if (!one_msg_action)
2269 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2271 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2273 return EXIT_FAILURE;
2275 goto END_ARG; /* Remaining args are ids */
2278 /* Others require only one message id, possibly followed by addresses,
2279 which will be handled as normal arguments. */
2283 if (!mac_ismsgid(argv[msg_action_arg]))
2285 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2286 argv[msg_action_arg], arg);
2287 return EXIT_FAILURE;
2294 /* Some programs seem to call the -om option without the leading o;
2295 for sendmail it askes for "me too". Exim always does this. */
2298 if (*argrest != 0) badarg = TRUE;
2302 /* -N: don't do delivery - a debugging option that stops transports doing
2303 their thing. It implies debugging at the D_v level. */
2308 dont_deliver = TRUE;
2309 debug_selector |= D_v;
2310 debug_file = stderr;
2316 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2322 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2323 option to the specified value. This form uses long names. We need to handle
2324 -O option=value and -Ooption=value. */
2331 fprintf(stderr, "exim: string expected after -O\n");
2339 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2342 if (*argrest == 'A')
2344 alias_arg = argrest + 1;
2345 if (alias_arg[0] == 0)
2347 if (i+1 < argc) alias_arg = argv[++i]; else
2349 fprintf(stderr, "exim: string expected after -oA\n");
2355 /* -oB: Set a connection message max value for remote deliveries */
2357 else if (*argrest == 'B')
2359 uschar *p = argrest + 1;
2362 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2364 connection_max_messages = 1;
2373 fprintf(stderr, "exim: number expected after -oB\n");
2376 connection_max_messages = Uatoi(p);
2380 /* -odb: background delivery */
2382 else if (Ustrcmp(argrest, "db") == 0)
2384 synchronous_delivery = FALSE;
2385 arg_queue_only = FALSE;
2386 queue_only_set = TRUE;
2389 /* -odf: foreground delivery (smail-compatible option); same effect as
2390 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2393 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2395 synchronous_delivery = TRUE;
2396 arg_queue_only = FALSE;
2397 queue_only_set = TRUE;
2400 /* -odq: queue only */
2402 else if (Ustrcmp(argrest, "dq") == 0)
2404 synchronous_delivery = FALSE;
2405 arg_queue_only = TRUE;
2406 queue_only_set = TRUE;
2409 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2410 but no remote delivery */
2412 else if (Ustrcmp(argrest, "dqs") == 0)
2415 arg_queue_only = FALSE;
2416 queue_only_set = TRUE;
2419 /* -oex: Sendmail error flags. As these are also accepted without the
2420 leading -o prefix, for compatibility with vacation and other callers,
2421 they are handled with -e above. */
2423 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2424 -oitrue: Another sendmail syntax for the same */
2426 else if (Ustrcmp(argrest, "i") == 0 ||
2427 Ustrcmp(argrest, "itrue") == 0)
2430 /* -oM*: Set various characteristics for an incoming message; actually
2431 acted on for trusted callers only. */
2433 else if (*argrest == 'M')
2437 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2441 /* -oMa: Set sender host address */
2443 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2445 /* -oMaa: Set authenticator name */
2447 else if (Ustrcmp(argrest, "Maa") == 0)
2448 sender_host_authenticated = argv[++i];
2450 /* -oMas: setting authenticated sender */
2452 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2454 /* -oMai: setting authenticated id */
2456 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2458 /* -oMi: Set incoming interface address */
2460 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2462 /* -oMr: Received protocol */
2464 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2466 /* -oMs: Set sender host name */
2468 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2470 /* -oMt: Set sender ident */
2472 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2474 /* Else a bad argument */
2483 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2484 seem to call this as -m (undocumented), so that is also accepted (see
2487 else if (Ustrcmp(argrest, "m") == 0) {}
2489 /* -oo: An ancient flag for old-style addresses which still seems to
2490 crop up in some calls (see in SCO). */
2492 else if (Ustrcmp(argrest, "o") == 0) {}
2494 /* -oP <name>: set pid file path for daemon */
2496 else if (Ustrcmp(argrest, "P") == 0)
2497 override_pid_file_path = argv[++i];
2499 /* -or <n>: set timeout for non-SMTP acceptance
2500 -os <n>: set timeout for SMTP acceptance */
2502 else if (*argrest == 'r' || *argrest == 's')
2504 int *tp = (*argrest == 'r')?
2505 &arg_receive_timeout : &arg_smtp_receive_timeout;
2506 if (argrest[1] == 0)
2508 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2510 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2513 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2518 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2520 else if (Ustrcmp(argrest, "X") == 0)
2521 override_local_interfaces = argv[++i];
2523 /* Unknown -o argument */
2529 /* -ps: force Perl startup; -pd force delayed Perl startup */
2533 if (*argrest == 's' && argrest[1] == 0)
2535 perl_start_option = 1;
2538 if (*argrest == 'd' && argrest[1] == 0)
2540 perl_start_option = -1;
2545 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2546 which sets the host protocol and host name */
2550 if (i+1 < argc) argrest = argv[++i]; else
2551 { badarg = TRUE; break; }
2556 uschar *hn = Ustrchr(argrest, ':');
2559 received_protocol = argrest;
2563 received_protocol = string_copyn(argrest, hn - argrest);
2564 sender_host_name = hn + 1;
2571 receiving_message = FALSE;
2573 /* -qq...: Do queue runs in a 2-stage manner */
2575 if (*argrest == 'q')
2577 queue_2stage = TRUE;
2581 /* -qi...: Do only first (initial) deliveries */
2583 if (*argrest == 'i')
2585 queue_run_first_delivery = TRUE;
2589 /* -qf...: Run the queue, forcing deliveries
2590 -qff..: Ditto, forcing thawing as well */
2592 if (*argrest == 'f')
2594 queue_run_force = TRUE;
2595 if (*(++argrest) == 'f')
2597 deliver_force_thaw = TRUE;
2602 /* -q[f][f]l...: Run the queue only on local deliveries */
2604 if (*argrest == 'l')
2606 queue_run_local = TRUE;
2610 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2611 optionally starting from a given message id. */
2613 if (*argrest == 0 &&
2614 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2617 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2618 start_queue_run_id = argv[++i];
2619 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2620 stop_queue_run_id = argv[++i];
2623 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2624 optionally local only. */
2629 queue_interval = readconf_readtime(argrest, 0, FALSE);
2631 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2632 if (queue_interval <= 0)
2634 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2641 case 'R': /* Synonymous with -qR... */
2642 receiving_message = FALSE;
2644 /* -Rf: As -R (below) but force all deliveries,
2645 -Rff: Ditto, but also thaw all frozen messages,
2646 -Rr: String is regex
2647 -Rrf: Regex and force
2648 -Rrff: Regex and force and thaw
2650 in all cases provided there are no further characters in this
2656 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2658 if (Ustrcmp(argrest, rsopts[i]) == 0)
2660 if (i != 2) queue_run_force = TRUE;
2661 if (i >= 2) deliver_selectstring_regex = TRUE;
2662 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2663 argrest += Ustrlen(rsopts[i]);
2668 /* -R: Set string to match in addresses for forced queue run to
2669 pick out particular messages. */
2673 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2675 fprintf(stderr, "exim: string expected after -R\n");
2679 else deliver_selectstring = argrest;
2680 if (queue_interval < 0) queue_interval = 0;
2684 /* -r: an obsolete synonym for -f (see above) */
2687 /* -S: Like -R but works on sender. */
2689 case 'S': /* Synonymous with -qS... */
2690 receiving_message = FALSE;
2692 /* -Sf: As -S (below) but force all deliveries,
2693 -Sff: Ditto, but also thaw all frozen messages,
2694 -Sr: String is regex
2695 -Srf: Regex and force
2696 -Srff: Regex and force and thaw
2698 in all cases provided there are no further characters in this
2704 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2706 if (Ustrcmp(argrest, rsopts[i]) == 0)
2708 if (i != 2) queue_run_force = TRUE;
2709 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2710 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2711 argrest += Ustrlen(rsopts[i]);
2716 /* -S: Set string to match in addresses for forced queue run to
2717 pick out particular messages. */
2721 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2723 fprintf(stderr, "exim: string expected after -S\n");
2727 else deliver_selectstring_sender = argrest;
2728 if (queue_interval < 0) queue_interval = 0;
2731 /* -Tqt is an option that is exclusively for use by the testing suite.
2732 It is not recognized in other circumstances. It allows for the setting up
2733 of explicit "queue times" so that various warning/retry things can be
2734 tested. Otherwise variability of clock ticks etc. cause problems. */
2737 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2738 fudged_queue_times = argv[++i];
2743 /* -t: Set flag to extract recipients from body of message. */
2746 if (*argrest == 0) extract_recipients = TRUE;
2748 /* -ti: Set flag to extract recipients from body of message, and also
2749 specify that dot does not end the message. */
2751 else if (Ustrcmp(argrest, "i") == 0)
2753 extract_recipients = TRUE;
2757 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2760 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2767 /* -U: This means "initial user submission" in sendmail, apparently. The
2768 doc claims that in future sendmail may refuse syntactically invalid
2769 messages instead of fixing them. For the moment, we just ignore it. */
2775 /* -v: verify things - this is a very low-level debugging */
2780 debug_selector |= D_v;
2781 debug_file = stderr;
2787 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2789 The -x flag tells the sendmail command that mail from a local
2790 mail program has National Language Support (NLS) extended characters
2791 in the body of the mail item. The sendmail command can send mail with
2792 extended NLS characters across networks that normally corrupts these
2795 As Exim is 8-bit clean, it just ignores this flag. */
2798 if (*argrest != 0) badarg = TRUE;
2801 /* All other initial characters are errors */
2806 } /* End of high-level switch statement */
2808 /* Failed to recognize the option, or syntax error */
2812 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2813 "option %s\n", arg);
2819 /* Arguments have been processed. Check for incompatibilities. */
2823 (smtp_input || extract_recipients || recipients_arg < argc) &&
2824 (daemon_listen || queue_interval >= 0 || bi_option ||
2825 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2826 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2829 msg_action_arg > 0 &&
2830 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2831 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2834 (daemon_listen || queue_interval >= 0) &&
2835 (sender_address != NULL || list_options || list_queue || checking ||
2839 daemon_listen && queue_interval == 0
2843 (checking || smtp_input || extract_recipients ||
2844 filter_test != FTEST_NONE || bi_option)
2847 verify_address_mode &&
2848 (address_test_mode || smtp_input || extract_recipients ||
2849 filter_test != FTEST_NONE || bi_option)
2852 address_test_mode && (smtp_input || extract_recipients ||
2853 filter_test != FTEST_NONE || bi_option)
2856 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2860 deliver_selectstring != NULL && queue_interval < 0
2864 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2868 /* If debugging is set up, set the file and the file descriptor to pass on to
2869 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2870 to run in the foreground. */
2872 if (debug_selector != 0)
2874 debug_file = stderr;
2875 debug_fd = fileno(debug_file);
2876 background_daemon = FALSE;
2877 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2878 if (debug_selector != D_v) /* -v only doesn't show this */
2880 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2881 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2883 show_whats_supported(stderr);
2887 /* When started with root privilege, ensure that the limits on the number of
2888 open files and the number of processes (where that is accessible) are
2889 sufficiently large, or are unset, in case Exim has been called from an
2890 environment where the limits are screwed down. Not all OS have the ability to
2891 change some of these limits. */
2895 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2901 #ifdef RLIMIT_NOFILE
2902 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2904 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2906 rlp.rlim_cur = rlp.rlim_max = 0;
2909 /* I originally chose 1000 as a nice big number that was unlikely to
2910 be exceeded. It turns out that some older OS have a fixed upper limit of
2913 if (rlp.rlim_cur < 1000)
2915 rlp.rlim_cur = rlp.rlim_max = 1000;
2916 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2918 rlp.rlim_cur = rlp.rlim_max = 256;
2919 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2920 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2927 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2929 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2931 rlp.rlim_cur = rlp.rlim_max = 0;
2934 #ifdef RLIM_INFINITY
2935 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2937 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2939 if (rlp.rlim_cur < 1000)
2941 rlp.rlim_cur = rlp.rlim_max = 1000;
2943 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2944 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2950 /* Exim is normally entered as root (but some special configurations are
2951 possible that don't do this). However, it always spins off sub-processes that
2952 set their uid and gid as required for local delivery. We don't want to pass on
2953 any extra groups that root may belong to, so we want to get rid of them all at
2956 We need to obey setgroups() at this stage, before possibly giving up root
2957 privilege for a changed configuration file, but later on we might need to
2958 check on the additional groups for the admin user privilege - can't do that
2959 till after reading the config, which might specify the exim gid. Therefore,
2960 save the group list here first. */
2962 group_count = getgroups(NGROUPS_MAX, group_list);
2964 /* There is a fundamental difference in some BSD systems in the matter of
2965 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2966 known not to be different. On the "different" systems there is a single group
2967 list, and the first entry in it is the current group. On all other versions of
2968 Unix there is a supplementary group list, which is in *addition* to the current
2969 group. Consequently, to get rid of all extraneous groups on a "standard" system
2970 you pass over 0 groups to setgroups(), while on a "different" system you pass
2971 over a single group - the current group, which is always the first group in the
2972 list. Calling setgroups() with zero groups on a "different" system results in
2973 an error return. The following code should cope with both types of system.
2975 However, if this process isn't running as root, setgroups() can't be used
2976 since you have to be root to run it, even if throwing away groups. Not being
2977 root here happens only in some unusual configurations. We just ignore the
2980 if (setgroups(0, NULL) != 0)
2982 if (setgroups(1, group_list) != 0 && !unprivileged)
2984 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2989 /* If the configuration file name has been altered by an argument on the
2990 command line (either a new file name or a macro definition) and the caller is
2991 not root or the exim user, or if this is a filter testing run, remove any
2992 setuid privilege the program has, and run as the underlying user.
2994 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2995 severely restricts the use of -C for some purposes.
2997 Otherwise, set the real ids to the effective values (should be root unless run
2998 from inetd, which it can either be root or the exim uid, if one is configured).
3000 There is a private mechanism for bypassing some of this, in order to make it
3001 possible to test lots of configurations automatically, without having either to
3002 recompile each time, or to patch in an actual configuration file name and other
3003 values (such as the path name). If running in the test harness, pretend that
3004 configuration file changes and macro definitions haven't happened. */
3007 (config_changed || macros != NULL) && /* Config changed, and */
3008 real_uid != root_uid && /* Not root, and */
3009 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3010 real_uid != exim_uid && /* Not exim, and */
3012 !running_in_test_harness /* Not fudged */
3014 expansion_test /* expansion testing */
3016 filter_test != FTEST_NONE) /* Filter testing */
3018 setgroups(group_count, group_list);
3019 exim_setugid(real_uid, real_gid, FALSE,
3020 US"-C, -D, -be or -bf forces real uid");
3021 removed_privilege = TRUE;
3023 /* In the normal case when Exim is called like this, stderr is available
3024 and should be used for any logging information because attempts to write
3025 to the log will usually fail. To arrange this, we unset really_exim. However,
3026 if no stderr is available there is no point - we might as well have a go
3027 at the log (if it fails, syslog will be written). */
3029 if (log_stderr != NULL) really_exim = FALSE;
3032 /* Privilege is to be retained for the moment. It may be dropped later,
3033 depending on the job that this Exim process has been asked to do. For now, set
3034 the real uid to the effective so that subsequent re-execs of Exim are done by a
3037 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3039 /* If testing a filter, open the file(s) now, before wasting time doing other
3040 setups and reading the message. */
3042 if ((filter_test & FTEST_SYSTEM) != 0)
3044 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3047 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3049 return EXIT_FAILURE;
3053 if ((filter_test & FTEST_USER) != 0)
3055 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3058 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3060 return EXIT_FAILURE;
3064 /* Read the main runtime configuration data; this gives up if there
3065 is a failure. It leaves the configuration file open so that the subsequent
3066 configuration data for delivery can be read if needed. */
3070 /* Handle the decoding of logging options. */
3072 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3073 log_options, log_options_count, US"log");
3077 debug_printf("configuration file is %s\n", config_main_filename);
3078 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3079 log_extra_selector);
3082 /* If domain literals are not allowed, check the sender address that was
3083 supplied with -f. Ditto for a stripped trailing dot. */
3085 if (sender_address != NULL)
3087 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3089 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3090 "allowed\n", sender_address);
3091 return EXIT_FAILURE;
3093 if (f_end_dot && !strip_trailing_dot)
3095 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3096 "(trailing dot not allowed)\n", sender_address);
3097 return EXIT_FAILURE;
3101 /* Paranoia check of maximum lengths of certain strings. There is a check
3102 on the length of the log file path in log.c, which will come into effect
3103 if there are any calls to write the log earlier than this. However, if we
3104 get this far but the string is very long, it is better to stop now than to
3105 carry on and (e.g.) receive a message and then have to collapse. The call to
3106 log_write() from here will cause the ultimate panic collapse if the complete
3107 file name exceeds the buffer length. */
3109 if (Ustrlen(log_file_path) > 200)
3110 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3111 "log_file_path is longer than 200 chars: aborting");
3113 if (Ustrlen(pid_file_path) > 200)
3114 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3115 "pid_file_path is longer than 200 chars: aborting");
3117 if (Ustrlen(spool_directory) > 200)
3118 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3119 "spool_directory is longer than 200 chars: aborting");
3121 /* Length check on the process name given to syslog for its TAG field,
3122 which is only permitted to be 32 characters or less. See RFC 3164. */
3124 if (Ustrlen(syslog_processname) > 32)
3125 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3126 "syslog_processname is longer than 32 chars: aborting");
3128 /* In some operating systems, the environment variable TMPDIR controls where
3129 temporary files are created; Exim doesn't use these (apart from when delivering
3130 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3131 If TMPDIR is found in the environment, reset it to the value defined in the
3132 TMPDIR macro, if this macro is defined. */
3137 for (p = USS environ; *p != NULL; p++)
3139 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3140 Ustrcmp(*p+7, TMPDIR) != 0)
3142 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3143 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3145 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3151 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3152 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3153 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3154 called by a user who has set the TZ variable. This then affects the timestamps
3155 in log files and in Received: headers, and any created Date: header lines. The
3156 required timezone is settable in the configuration file, so nothing can be done
3157 about this earlier - but hopefully nothing will normally be logged earlier than
3158 this. We have to make a new environment if TZ is wrong, but don't bother if
3159 timestamps_utc is set, because then all times are in UTC anyway. */
3161 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3163 timestamps_utc = TRUE;
3167 uschar *envtz = US getenv("TZ");
3168 if ((envtz == NULL && timezone_string != NULL) ||
3170 (timezone_string == NULL ||
3171 Ustrcmp(timezone_string, envtz) != 0)))
3173 uschar **p = USS environ;
3177 while (*p++ != NULL) count++;
3178 if (envtz == NULL) count++;
3179 newp = new = malloc(sizeof(uschar *) * (count + 1));
3180 for (p = USS environ; *p != NULL; p++)
3182 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3185 if (timezone_string != NULL)
3187 *newp = malloc(Ustrlen(timezone_string) + 4);
3188 sprintf(CS *newp++, "TZ=%s", timezone_string);
3193 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3194 tod_stamp(tod_log));
3198 /* Handle the case when we have removed the setuid privilege because of -C or
3199 -D. This means that the caller of Exim was not root, and, provided that
3200 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3203 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3204 were running as the exim user defined in the configuration file (different to
3205 the one in the binary). The sysadmin may expect this case to retain privilege
3206 because "the binary was called by the Exim user", but it hasn't, because of the
3207 order in which it handles this stuff. There are two possibilities:
3209 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3210 to do message deliveries. Thus, the fact that it is running as a
3211 non-privileged user is plausible, and might be wanted in some special
3212 configurations. However, really_exim will have been set false when
3213 privilege was dropped, to stop Exim trying to write to its normal log
3214 files. Therefore, re-enable normal log processing, assuming the sysadmin
3215 has set up the log directory correctly.
3217 (2) If deliver_drop_privilege is not set, the configuration won't work as
3218 apparently intended, and so we log a panic message. In order to retain
3219 root for -C or -D, the caller must either be root or the Exim user
3220 defined in the binary (when deliver_drop_ privilege is false).
3222 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3223 built-in exim user or one defined in the configuration. In either event,
3224 re-enable log processing, assuming the sysadmin knows what they are doing. */
3226 if (removed_privilege && (config_changed || macros != NULL) &&
3227 real_uid == exim_uid)
3229 #ifdef ALT_CONFIG_ROOT_ONLY
3230 really_exim = TRUE; /* let logging work normally */
3233 if (deliver_drop_privilege)
3234 really_exim = TRUE; /* let logging work normally */
3236 log_write(0, LOG_MAIN|LOG_PANIC,
3237 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3238 (int)exim_uid, config_changed? "-C" : "-D");
3242 /* Start up Perl interpreter if Perl support is configured and there is a
3243 perl_startup option, and the configuration or the command line specifies
3244 initializing starting. Note that the global variables are actually called
3245 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3248 if (perl_start_option != 0)
3249 opt_perl_at_start = (perl_start_option > 0);
3250 if (opt_perl_at_start && opt_perl_startup != NULL)
3253 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3254 errstr = init_perl(opt_perl_startup);
3257 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3258 return EXIT_FAILURE;
3260 opt_perl_started = TRUE;
3262 #endif /* EXIM_PERL */
3264 /* Log the arguments of the call if the configuration file said so. This is
3265 a debugging feature for finding out what arguments certain MUAs actually use.
3266 Don't attempt it if logging is disabled, or if listing variables or if
3267 verifying/testing addresses or expansions. */
3269 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3270 && really_exim && !list_options && !checking)
3273 uschar *p = big_buffer;
3275 (void)getcwd(CS p+4, big_buffer_size - 4);
3277 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3279 for (i = 0; i < argc; i++)
3281 int len = Ustrlen(argv[i]);
3284 if (p + len + 8 >= big_buffer + big_buffer_size)
3287 log_write(0, LOG_MAIN, "%s", big_buffer);
3288 Ustrcpy(big_buffer, "...");
3291 printing = string_printing(argv[i]);
3292 if (printing[0] == 0) quote = US"\""; else
3294 uschar *pp = printing;
3296 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3298 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3299 (p - big_buffer) - 4), printing, quote);
3303 if ((log_extra_selector & LX_arguments) != 0)
3304 log_write(0, LOG_MAIN, "%s", big_buffer);
3306 debug_printf("%s\n", big_buffer);
3309 /* Set the working directory to be the top-level spool directory. We don't rely
3310 on this in the code, which always uses fully qualified names, but it's useful
3311 for core dumps etc. Don't complain if it fails - the spool directory might not
3312 be generally accessible and calls with the -C option (and others) have lost
3313 privilege by now. Before the chdir, we try to ensure that the directory exists.
3316 if (Uchdir(spool_directory) != 0)
3318 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3319 (void)Uchdir(spool_directory);
3322 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3323 alias file. Exim doesn't have such a concept, but this call is screwed into
3324 Sun's YP makefiles. Handle this by calling a configured script, as the real
3325 user who called Exim. The -oA option can be used to pass an argument to the
3330 (void)fclose(config_file);
3331 if (bi_command != NULL)
3335 argv[i++] = bi_command;
3336 if (alias_arg != NULL) argv[i++] = alias_arg;
3339 setgroups(group_count, group_list);
3340 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3342 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3343 (argv[1] == NULL)? US"" : argv[1]);
3345 execv(CS argv[0], (char *const *)argv);
3346 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3351 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3356 /* If an action on specific messages is requested, or if a daemon or queue
3357 runner is being started, we need to know if Exim was called by an admin user.
3358 This is the case if the real user is root or exim, or if the real group is
3359 exim, or if one of the supplementary groups is exim or a group listed in
3360 admin_groups. We don't fail all message actions immediately if not admin_user,
3361 since some actions can be performed by non-admin users. Instead, set admin_user
3362 for later interrogation. */
3364 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3370 for (i = 0; i < group_count; i++)
3372 if (group_list[i] == exim_gid) admin_user = TRUE;
3373 else if (admin_groups != NULL)
3375 for (j = 1; j <= (int)(admin_groups[0]); j++)
3376 if (admin_groups[j] == group_list[i])
3377 { admin_user = TRUE; break; }
3379 if (admin_user) break;
3383 /* Another group of privileged users are the trusted users. These are root,
3384 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3385 are permitted to specify sender_addresses with -f on the command line, and
3386 other message parameters as well. */
3388 if (real_uid == root_uid || real_uid == exim_uid)
3389 trusted_caller = TRUE;
3394 if (trusted_users != NULL)
3396 for (i = 1; i <= (int)(trusted_users[0]); i++)
3397 if (trusted_users[i] == real_uid)
3398 { trusted_caller = TRUE; break; }
3401 if (!trusted_caller && trusted_groups != NULL)
3403 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3405 if (trusted_groups[i] == real_gid)
3406 trusted_caller = TRUE;
3407 else for (j = 0; j < group_count; j++)
3409 if (trusted_groups[i] == group_list[j])
3410 { trusted_caller = TRUE; break; }
3412 if (trusted_caller) break;
3417 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3418 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3420 /* Only an admin user may start the daemon or force a queue run in the default
3421 configuration, but the queue run restriction can be relaxed. Only an admin
3422 user may request that a message be returned to its sender forthwith. Only an
3423 admin user may specify a debug level greater than D_v (because it might show
3424 passwords, etc. in lookup queries). Only an admin user may request a queue
3429 BOOL debugset = (debug_selector & ~D_v) != 0;
3430 if (deliver_give_up || daemon_listen ||
3431 (count_queue && queue_list_requires_admin) ||
3432 (list_queue && queue_list_requires_admin) ||
3433 (queue_interval >= 0 && prod_requires_admin) ||
3434 (debugset && !running_in_test_harness))
3436 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3441 /* If the real user is not root or the exim uid, the argument for passing
3442 in an open TCP/IP connection for another message is not permitted, nor is
3443 running with the -N option for any delivery action, unless this call to exim is
3444 one that supplied an input message, or we are using a patched exim for
3445 regression testing. */
3447 if (real_uid != root_uid && real_uid != exim_uid &&
3448 (continue_hostname != NULL ||
3450 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3451 )) && !running_in_test_harness)
3453 fprintf(stderr, "exim: Permission denied\n");
3454 return EXIT_FAILURE;
3457 /* If the caller is not trusted, certain arguments are ignored when running for
3458 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3459 Note that authority for performing certain actions on messages is tested in the
3460 queue_action() function. */
3462 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3464 sender_host_name = sender_host_address = interface_address =
3465 sender_ident = received_protocol = NULL;
3466 sender_host_port = interface_port = 0;
3467 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3470 /* If a sender host address is set, extract the optional port number off the
3471 end of it and check its syntax. Do the same thing for the interface address.
3472 Exim exits if the syntax is bad. */
3476 if (sender_host_address != NULL)
3477 sender_host_port = check_port(sender_host_address);
3478 if (interface_address != NULL)
3479 interface_port = check_port(interface_address);
3482 /* If an SMTP message is being received check to see if the standard input is a
3483 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3484 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3489 union sockaddr_46 inetd_sock;
3490 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3491 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3493 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3494 if (family == AF_INET || family == AF_INET6)
3496 union sockaddr_46 interface_sock;
3497 size = sizeof(interface_sock);
3499 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3500 interface_address = host_ntoa(-1, &interface_sock, NULL,
3503 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3505 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3508 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3509 NULL, &sender_host_port);
3510 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3511 "inetd is not supported when mua_wrapper is set");
3516 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3517 return EXIT_FAILURE;
3523 /* If the load average is going to be needed while receiving a message, get it
3524 now for those OS that require the first call to os_getloadavg() to be done as
3525 root. There will be further calls later for each message received. */
3527 #ifdef LOAD_AVG_NEEDS_ROOT
3528 if (receiving_message &&
3529 (queue_only_load >= 0 ||
3530 (is_inetd && smtp_load_reserve >= 0)
3533 load_average = os_getloadavg();
3537 /* The queue_only configuration option can be overridden by -odx on the command
3538 line, except that if queue_only_override is false, queue_only cannot be unset
3539 from the command line. */
3541 if (queue_only_set && (queue_only_override || arg_queue_only))
3542 queue_only = arg_queue_only;
3544 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3547 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3548 if (arg_smtp_receive_timeout >= 0)
3549 smtp_receive_timeout = arg_smtp_receive_timeout;
3551 /* If Exim was started with root privilege, unless we have already removed the
3552 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3553 except when starting the daemon or doing some kind of delivery or address
3554 testing (-bt). These are the only cases when root need to be retained. We run
3555 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3556 retained only for starting the daemon. */
3558 if (!unprivileged && /* originally had root AND */
3559 !removed_privilege && /* still got root AND */
3560 !daemon_listen && /* not starting the daemon */
3561 queue_interval <= 0 && /* (either kind of daemon) */
3563 deliver_drop_privilege || /* requested unprivileged */
3565 queue_interval < 0 && /* not running the queue */
3566 (msg_action_arg < 0 || /* and */
3567 msg_action != MSG_DELIVER) && /* not delivering and */
3568 (!checking || !address_test_mode) /* not address checking */
3572 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3575 /* When we are retaining a privileged uid, we still change to the exim gid. */
3577 else setgid(exim_gid);
3579 /* Handle a request to list the delivery queue */
3583 set_process_info("listing the queue");
3584 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3588 /* Handle a request to count the delivery queue */
3592 set_process_info("counting the queue");
3597 /* Handle actions on specific messages, except for the force delivery action,
3598 which is done below. Some actions take a whole list of message ids, which
3599 are known to continue up to the end of the arguments. Others take a single
3600 message id and then operate on the recipients list. */
3602 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3604 int yield = EXIT_SUCCESS;
3605 set_process_info("acting on specified messages");
3607 if (!one_msg_action)
3609 for (i = msg_action_arg; i < argc; i++)
3610 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3611 yield = EXIT_FAILURE;
3614 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3615 recipients_arg)) yield = EXIT_FAILURE;
3619 /* All the modes below here require the remaining configuration sections
3620 to be read, except that we can skip over the ACL setting when delivering
3621 specific messages, or doing a queue run. (For various testing cases we could
3622 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3625 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3627 /* The configuration data will have been read into POOL_PERM because we won't
3628 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3629 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3630 configuration were read into POOL_MAIN, because we don't do any resets till
3631 later on. However, it seems right, and it does ensure that both pools get used.
3634 store_pool = POOL_MAIN;
3636 /* Handle the -brt option. This is for checking out retry configurations.
3637 The next three arguments are a domain name or a complete address, and
3638 optionally two error numbers. All it does is to call the function that
3639 scans the retry configuration data. */
3641 if (test_retry_arg >= 0)
3643 retry_config *yield;
3644 int basic_errno = 0;
3648 if (test_retry_arg >= argc)
3650 printf("-brt needs a domain or address argument\n");
3651 exim_exit(EXIT_FAILURE);
3653 s1 = argv[test_retry_arg++];
3656 /* If the first argument contains no @ and no . it might be a local user
3657 or it might be a single-component name. Treat as a domain. */
3659 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3661 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3662 "being \ntreated as a one-component domain, not as a local part.\n\n",
3666 /* There may be an optional second domain arg. */
3668 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3669 s2 = argv[test_retry_arg++];
3671 /* The final arg is an error name */
3673 if (test_retry_arg < argc)
3675 uschar *ss = argv[test_retry_arg];
3677 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3680 printf("%s\n", CS error);
3681 return EXIT_FAILURE;
3684 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3685 an error is for matching codes to the decade. Turn them into a real error
3686 code, off the decade. */
3688 if (basic_errno == ERRNO_RCPT4XX)
3690 int code = (more_errno >> 8) & 255;
3692 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3693 else if (code > 100)
3694 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3698 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3699 if (yield == NULL) printf("No retry information found\n"); else
3702 more_errno = yield->more_errno;
3703 printf("Retry rule: %s ", yield->pattern);
3705 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3707 printf("quota%s%s ",
3708 (more_errno > 0)? "_" : "",
3709 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3711 else if (yield->basic_errno == ECONNREFUSED)
3713 printf("refused%s%s ",
3714 (more_errno > 0)? "_" : "",
3715 (more_errno == 'M')? "MX" :
3716 (more_errno == 'A')? "A" : "");
3718 else if (yield->basic_errno == ETIMEDOUT)
3721 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3723 if (more_errno != 0) printf("_%s",
3724 (more_errno == 'M')? "MX" : "A");
3727 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3728 printf("auth_failed ");
3731 for (r = yield->rules; r != NULL; r = r->next)
3733 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3734 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3740 printf(",%d.", x/1000);
3754 exim_exit(EXIT_SUCCESS);
3757 /* Handle a request to list one or more configuration options */
3761 set_process_info("listing variables");
3762 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3763 else for (i = recipients_arg; i < argc; i++)
3766 (Ustrcmp(argv[i], "router") == 0 ||
3767 Ustrcmp(argv[i], "transport") == 0 ||
3768 Ustrcmp(argv[i], "authenticator") == 0))
3770 readconf_print(argv[i+1], argv[i]);
3773 else readconf_print(argv[i], NULL);
3775 exim_exit(EXIT_SUCCESS);
3779 /* Handle a request to deliver one or more messages that are already on the
3780 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3781 is typically used for a small number when prodding by hand (when the option
3782 forced_delivery will be set) or when re-execing to regain root privilege.
3783 Each message delivery must happen in a separate process, so we fork a process
3784 for each one, and run them sequentially so that debugging output doesn't get
3785 intertwined, and to avoid spawning too many processes if a long list is given.
3786 However, don't fork for the last one; this saves a process in the common case
3787 when Exim is called to deliver just one message. */
3789 if (msg_action_arg > 0)
3791 if (prod_requires_admin && !admin_user)
3793 fprintf(stderr, "exim: Permission denied\n");
3794 exim_exit(EXIT_FAILURE);
3796 set_process_info("delivering specified messages");
3797 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3798 for (i = msg_action_arg; i < argc; i++)
3803 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3804 else if ((pid = fork()) == 0)
3806 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3807 _exit(EXIT_SUCCESS);
3811 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3813 exim_exit(EXIT_FAILURE);
3817 exim_exit(EXIT_SUCCESS);
3821 /* If only a single queue run is requested, without SMTP listening, we can just
3822 turn into a queue runner, with an optional starting message id. */
3824 if (queue_interval == 0 && !daemon_listen)
3826 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3827 (start_queue_run_id == NULL)? US"" : US" starting at ",
3828 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3829 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3830 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3831 set_process_info("running the queue (single queue run)");
3832 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3833 exim_exit(EXIT_SUCCESS);
3837 /* Find the login name of the real user running this process. This is always
3838 needed when receiving a message, because it is written into the spool file. It
3839 may also be used to construct a from: or a sender: header, and in this case we
3840 need the user's full name as well, so save a copy of it, checked for RFC822
3841 syntax and munged if necessary, if it hasn't previously been set by the -F
3842 argument. We may try to get the passwd entry more than once, in case NIS or
3843 other delays are in evidence. Save the home directory for use in filter testing
3848 if ((pw = getpwuid(real_uid)) != NULL)
3850 originator_login = string_copy(US pw->pw_name);
3851 originator_home = string_copy(US pw->pw_dir);
3853 /* If user name has not been set by -F, set it from the passwd entry
3854 unless -f has been used to set the sender address by a trusted user. */
3856 if (originator_name == NULL)
3858 if (sender_address == NULL ||
3859 (!trusted_caller && filter_test == FTEST_NONE))
3861 uschar *name = US pw->pw_gecos;
3862 uschar *amp = Ustrchr(name, '&');
3865 /* Most Unix specify that a '&' character in the gecos field is
3866 replaced by a copy of the login name, and some even specify that
3867 the first character should be upper cased, so that's what we do. */
3872 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3873 amp - name, name, &loffset, originator_login, amp + 1);
3874 buffer[loffset] = toupper(buffer[loffset]);
3878 /* If a pattern for matching the gecos field was supplied, apply
3879 it and then expand the name string. */
3881 if (gecos_pattern != NULL && gecos_name != NULL)
3884 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3886 if (regex_match_and_setup(re, name, 0, -1))
3888 uschar *new_name = expand_string(gecos_name);
3890 if (new_name != NULL)
3892 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3893 "gecos field \"%s\"\n", new_name, name);
3896 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3897 "\"%s\": %s\n", gecos_name, expand_string_message);
3899 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3900 "gecos field \"%s\"\n", gecos_pattern, name);
3901 store_free((void *)re);
3903 originator_name = string_copy(name);
3906 /* A trusted caller has used -f but not -F */
3908 else originator_name = US"";
3911 /* Break the retry loop */
3916 if (++i > finduser_retries) break;
3920 /* If we cannot get a user login, log the incident and give up, unless the
3921 configuration specifies something to use. When running in the test harness,
3922 any setting of unknown_login overrides the actual name. */
3924 if (originator_login == NULL || running_in_test_harness)
3926 if (unknown_login != NULL)
3928 originator_login = expand_string(unknown_login);
3929 if (originator_name == NULL && unknown_username != NULL)
3930 originator_name = expand_string(unknown_username);
3931 if (originator_name == NULL) originator_name = US"";
3933 if (originator_login == NULL)
3934 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3938 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3941 originator_name = string_copy(parse_fix_phrase(originator_name,
3942 Ustrlen(originator_name), big_buffer, big_buffer_size));
3944 /* If a message is created by this call of Exim, the uid/gid of its originator
3945 are those of the caller. These values are overridden if an existing message is
3946 read in from the spool. */
3948 originator_uid = real_uid;
3949 originator_gid = real_gid;
3951 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3952 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3954 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3955 returns. We leave this till here so that the originator_ fields are available
3956 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3959 if (daemon_listen || queue_interval > 0)
3963 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3964 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3965 "mua_wrapper is set");
3970 /* If the sender ident has not been set (by a trusted caller) set it to
3971 the caller. This will get overwritten below for an inetd call. If a trusted
3972 caller has set it empty, unset it. */
3974 if (sender_ident == NULL) sender_ident = originator_login;
3975 else if (sender_ident[0] == 0) sender_ident = NULL;
3977 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3978 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3979 originator_* variables set. */
3981 if (test_rewrite_arg >= 0)
3983 really_exim = FALSE;
3984 if (test_rewrite_arg >= argc)
3986 printf("-brw needs an address argument\n");
3987 exim_exit(EXIT_FAILURE);
3989 rewrite_test(argv[test_rewrite_arg]);
3990 exim_exit(EXIT_SUCCESS);
3993 /* A locally-supplied message is considered to be coming from a local user
3994 unless a trusted caller supplies a sender address with -f, or is passing in the
3995 message via SMTP (inetd invocation or otherwise). */
3997 if ((sender_address == NULL && !smtp_input) ||
3998 (!trusted_caller && filter_test == FTEST_NONE))
4000 sender_local = TRUE;
4002 /* A trusted caller can supply authenticated_sender and authenticated_id
4003 via -oMas and -oMai and if so, they will already be set. */
4005 if (authenticated_sender == NULL)
4006 authenticated_sender = string_sprintf("%s@%s", originator_login,
4007 qualify_domain_sender);
4008 if (authenticated_id == NULL) authenticated_id = originator_login;
4011 /* Trusted callers are always permitted to specify the sender address.
4012 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4013 is specified is the empty address. However, if a trusted caller does not
4014 specify a sender address for SMTP input, we leave sender_address unset. This
4015 causes the MAIL commands to be honoured. */
4017 if ((!smtp_input && sender_address == NULL) ||
4018 !receive_check_set_sender(sender_address))
4020 /* Either the caller is not permitted to set a general sender, or this is
4021 non-SMTP input and the trusted caller has not set a sender. If there is no
4022 sender, or if a sender other than <> is set, override with the originator's
4023 login (which will get qualified below), except when checking things. */
4025 if (sender_address == NULL /* No sender_address set */
4027 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4028 !checking && /* Not running tests, AND */
4029 filter_test == FTEST_NONE)) /* Not testing a filter */
4031 sender_address = originator_login;
4032 sender_address_forced = FALSE;
4033 sender_address_domain = 0;
4037 /* Remember whether an untrusted caller set the sender address */
4039 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4041 /* Ensure that the sender address is fully qualified unless it is the empty
4042 address, which indicates an error message, or doesn't exist (root caller, smtp
4043 interface, no -f argument). */
4045 if (sender_address != NULL && sender_address[0] != 0 &&
4046 sender_address_domain == 0)
4047 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4048 qualify_domain_sender);
4050 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4052 /* Handle a request to verify a list of addresses, or test them for delivery.
4053 This must follow the setting of the sender address, since routers can be
4054 predicated upon the sender. If no arguments are given, read addresses from
4055 stdin. Set debug_level to at least D_v to get full output for address testing.
4058 if (verify_address_mode || address_test_mode)
4061 int flags = vopt_qualify;
4063 if (verify_address_mode)
4065 if (!verify_as_sender) flags |= vopt_is_recipient;
4066 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4071 flags |= vopt_is_recipient;
4072 debug_selector |= D_v;
4073 debug_file = stderr;
4074 debug_fd = fileno(debug_file);
4075 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4078 if (recipients_arg < argc)
4080 while (recipients_arg < argc)
4082 uschar *s = argv[recipients_arg++];
4085 BOOL finished = FALSE;
4086 uschar *ss = parse_find_address_end(s, FALSE);
4087 if (*ss == ',') *ss = 0; else finished = TRUE;
4088 test_address(s, flags, &exit_value);
4091 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4098 uschar *s = get_stdinput(NULL, NULL);
4099 if (s == NULL) break;
4100 test_address(s, flags, &exit_value);
4104 exim_exit(exit_value);
4107 /* Handle expansion checking */
4111 if (recipients_arg < argc)
4113 while (recipients_arg < argc)
4115 uschar *s = argv[recipients_arg++];
4116 uschar *ss = expand_string(s);
4118 printf ("Failed: %s\n", expand_string_message);
4119 else printf("%s\n", CS ss);
4127 char *(*fn_readline)(char *) = NULL;
4128 char *(*fn_addhist)(char *) = NULL;
4131 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4137 uschar *source = get_stdinput(fn_readline, fn_addhist);
4138 if (source == NULL) break;
4139 ss = expand_string(source);
4141 printf ("Failed: %s\n", expand_string_message);
4142 else printf("%s\n", CS ss);
4146 if (dlhandle != NULL) dlclose(dlhandle);
4150 exim_exit(EXIT_SUCCESS);
4154 /* The active host name is normally the primary host name, but it can be varied
4155 for hosts that want to play several parts at once. We need to ensure that it is
4156 set for host checking, and for receiving messages. */
4158 smtp_active_hostname = primary_hostname;
4159 if (raw_active_hostname != NULL)
4161 uschar *nah = expand_string(raw_active_hostname);
4164 if (!expand_string_forcedfail)
4165 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4166 "(smtp_active_hostname): %s", raw_active_hostname,
4167 expand_string_message);
4169 else if (nah[0] != 0) smtp_active_hostname = nah;
4172 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4173 given IP address so that the blocking and relay configuration can be tested. An
4174 RFC 1413 call is made only if we are running in the test harness and an
4175 incoming interface and both ports are specified, because there is no TCP/IP
4176 call to find the ident for. */
4183 sender_ident = NULL;
4184 if (running_in_test_harness && sender_host_port != 0 &&
4185 interface_address != NULL && interface_port != 0)
4186 verify_get_ident(1413);
4188 /* In case the given address is a non-canonical IPv6 address, canonicize
4189 it. The code works for both IPv4 and IPv6, as it happens. */
4191 size = host_aton(sender_host_address, x);
4192 sender_host_address = store_get(48); /* large enough for full IPv6 */
4193 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4195 /* Now set up for testing */
4197 host_build_sender_fullhost();
4201 sender_local = FALSE;
4202 sender_host_notsocket = TRUE;
4203 debug_file = stderr;
4204 debug_fd = fileno(debug_file);
4205 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4206 "**** but without any ident (RFC 1413) callback.\n"
4207 "**** This is not for real!\n\n",
4208 sender_host_address);
4210 if (verify_check_host(&hosts_connection_nolog) == OK)
4211 log_write_selector &= ~L_smtp_connection;
4212 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4214 if (smtp_start_session())
4216 reset_point = store_get(0);
4219 store_reset(reset_point);
4220 if (smtp_setup_msg() <= 0) break;
4221 if (!receive_msg(FALSE)) break;
4224 exim_exit(EXIT_SUCCESS);
4228 /* Arrange for message reception if recipients or SMTP were specified;
4229 otherwise complain unless a version print (-bV) happened or this is a filter
4230 verification test. In the former case, show the configuration file name. */
4232 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4234 if (version_printed)
4236 printf("Configuration file is %s\n", config_main_filename);
4237 return EXIT_SUCCESS;
4239 if (filter_test == FTEST_NONE)
4242 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4243 "not directly from a shell command line. Options and/or arguments control\n"
4244 "what it does when called. For a list of options, see the Exim documentation.\n");
4245 return EXIT_FAILURE;
4250 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4251 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4252 that we are not called from inetd, because that is rejected above. The
4253 following configuration settings are forced here:
4255 (1) Synchronous delivery (-odi)
4256 (2) Errors to stderr (-oep == -oeq)
4257 (3) No parallel remote delivery
4258 (4) Unprivileged delivery
4260 We don't force overall queueing options because there are several of them;
4261 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4262 to override any SMTP queueing. */
4266 synchronous_delivery = TRUE;
4267 arg_error_handling = ERRORS_STDERR;
4268 remote_max_parallel = 1;
4269 deliver_drop_privilege = TRUE;
4271 queue_smtp_domains = NULL;
4275 /* Prepare to accept one or more new messages on the standard input. When a
4276 message has been read, its id is returned in message_id[]. If doing immediate
4277 delivery, we fork a delivery process for each received message, except for the
4278 last one, where we can save a process switch.
4280 It is only in non-smtp mode that error_handling is allowed to be changed from
4281 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4282 sendmail error modes other than -oem ever actually used? Later: yes.) */
4284 if (!smtp_input) error_handling = arg_error_handling;
4286 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4287 logging being sent down the socket and make an identd call to get the
4292 (void)fclose(stderr);
4293 exim_nullstd(); /* Re-open to /dev/null */
4294 verify_get_ident(IDENT_PORT);
4295 host_build_sender_fullhost();
4296 set_process_info("handling incoming connection from %s via inetd",
4300 /* If the sender host address has been set, build sender_fullhost if it hasn't
4301 already been done (which it will have been for inetd). This caters for the
4302 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4303 so that the test for IP options is skipped for -bs input. */
4305 if (sender_host_address != NULL && sender_fullhost == NULL)
4307 host_build_sender_fullhost();
4308 set_process_info("handling incoming connection from %s via -oMa",
4310 sender_host_notsocket = TRUE;
4313 /* Otherwise, set the sender host as unknown except for inetd calls. This
4314 prevents host checking in the case of -bs not from inetd and also for -bS. */
4316 else if (!is_inetd) sender_host_unknown = TRUE;
4318 /* If stdout does not exist, then dup stdin to stdout. This can happen
4319 if exim is started from inetd. In this case fd 0 will be set to the socket,
4320 but fd 1 will not be set. This also happens for passed SMTP channels. */
4322 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4324 /* Set up the incoming protocol name and the state of the program. Root
4325 is allowed to force received protocol via the -oMr option above, and if we are
4326 in a non-local SMTP state it means we have come via inetd and the process info
4327 has already been set up. We don't set received_protocol here for smtp input,
4328 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4332 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4337 if (received_protocol == NULL)
4338 received_protocol = string_sprintf("local%s", called_as);
4339 set_process_info("accepting a local non-SMTP message from <%s>",
4343 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4347 local_queue_only = queue_only;
4349 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4350 the spool if so configured. On failure, we must not attempt to send an error
4351 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4352 error code is given.) */
4354 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4356 fprintf(stderr, "exim: insufficient disk space\n");
4357 return EXIT_FAILURE;
4360 /* If this is smtp input of any kind, handle the start of the SMTP
4367 if (verify_check_host(&hosts_connection_nolog) == OK)
4368 log_write_selector &= ~L_smtp_connection;
4369 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4370 if (!smtp_start_session())
4373 exim_exit(EXIT_SUCCESS);
4377 /* Otherwise, set up the input size limit here */
4381 thismessage_size_limit = expand_string_integer(message_size_limit);
4382 if (thismessage_size_limit < 0)
4384 if (thismessage_size_limit == -1)
4385 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4386 "message_size_limit: %s", expand_string_message);
4388 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4389 "message_size_limit: %s", expand_string_message);
4393 /* Loop for several messages when reading SMTP input. If we fork any child
4394 processes, we don't want to wait for them unless synchronous delivery is
4395 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4396 same as SIG_DFL, despite the fact that documentation often lists the default as
4397 "ignore". This is a confusing area. This is what I know:
4399 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4400 processes that complete simply to go away without ever becoming defunct. You
4401 can't then wait for them - but we don't want to wait for them in the
4402 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4403 happen for all OS (e.g. *BSD is different).
4405 But that's not the end of the story. Some (many? all?) systems have the
4406 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4407 has by default, so it seems that the difference is merely one of default
4408 (compare restarting vs non-restarting signals).
4410 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4411 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4412 of the loop below. Paranoia rules.
4414 February 2003: That's *still* not the end of the story. There are now versions
4415 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4416 process then calls waitpid(), a grumble is written to the system log, because
4417 this is logically inconsistent. In other words, it doesn't like the paranoia.
4418 As a consequenc of this, the waitpid() below is now excluded if we are sure
4419 that SIG_IGN works. */
4421 if (!synchronous_delivery)
4424 struct sigaction act;
4425 act.sa_handler = SIG_IGN;
4426 sigemptyset(&(act.sa_mask));
4427 act.sa_flags = SA_NOCLDWAIT;
4428 sigaction(SIGCHLD, &act, NULL);
4430 signal(SIGCHLD, SIG_IGN);
4434 /* Save the current store pool point, for resetting at the start of
4435 each message, and save the real sender address, if any. */
4437 reset_point = store_get(0);
4438 real_sender_address = sender_address;
4440 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4441 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4446 store_reset(reset_point);
4449 /* In the SMTP case, we have to handle the initial SMTP input and build the
4450 recipients list, before calling receive_msg() to read the message proper.
4451 Whatever sender address is actually given in the SMTP transaction is
4452 actually ignored for local senders - we use the actual sender, which is
4453 normally either the underlying user running this process or a -f argument
4454 provided by a trusted caller. It is saved in real_sender_address.
4456 However, if this value is NULL, we are dealing with a trusted caller when
4457 -f was not used; in this case, the SMTP sender is allowed to stand.
4459 Also, if untrusted_set_sender is set, we permit sender addresses that match
4460 anything in its list.
4462 The variable raw_sender_address holds the sender address before rewriting. */
4467 if ((rc = smtp_setup_msg()) > 0)
4469 if (real_sender_address != NULL &&
4470 !receive_check_set_sender(sender_address))
4472 sender_address = raw_sender = real_sender_address;
4473 sender_address_unrewritten = NULL;
4475 more = receive_msg(extract_recipients);
4476 if (message_id[0] == 0)
4479 exim_exit(EXIT_FAILURE);
4482 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4485 /* In the non-SMTP case, we have all the information from the command
4486 line, but must process it in case it is in the more general RFC822
4487 format, and in any case, to detect syntax errors. Also, it appears that
4488 the use of comma-separated lists as single arguments is common, so we
4489 had better support them. */
4495 int count = argc - recipients_arg;
4496 uschar **list = argv + recipients_arg;
4498 /* These options cannot be changed dynamically for non-SMTP messages */
4500 active_local_sender_retain = local_sender_retain;
4501 active_local_from_check = local_from_check;
4503 /* Save before any rewriting */
4505 raw_sender = string_copy(sender_address);
4507 /* Loop for each argument */
4509 for (i = 0; i < count; i++)
4511 int start, end, domain;
4513 uschar *s = list[i];
4515 /* Loop for each comma-separated address */
4519 BOOL finished = FALSE;
4521 uschar *ss = parse_find_address_end(s, FALSE);
4523 if (*ss == ',') *ss = 0; else finished = TRUE;
4525 /* Check max recipients - if -t was used, these aren't recipients */
4527 if (recipients_max > 0 && ++rcount > recipients_max &&
4528 !extract_recipients)
4530 if (error_handling == ERRORS_STDERR)
4532 fprintf(stderr, "exim: too many recipients\n");
4533 exim_exit(EXIT_FAILURE);
4538 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4539 errors_sender_rc : EXIT_FAILURE;
4544 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4546 if (domain == 0 && !allow_unqualified_recipient)
4549 errmess = US"unqualified recipient address not allowed";
4552 if (recipient == NULL)
4554 if (error_handling == ERRORS_STDERR)
4556 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4557 string_printing(list[i]), errmess);
4558 exim_exit(EXIT_FAILURE);
4564 eblock.text1 = string_printing(list[i]);
4565 eblock.text2 = errmess;
4567 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4568 errors_sender_rc : EXIT_FAILURE;
4572 receive_add_recipient(recipient, -1);
4575 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4579 /* Show the recipients when debugging */
4584 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4585 if (recipients_list != NULL)
4587 debug_printf("Recipients:\n");
4588 for (i = 0; i < recipients_count; i++)
4589 debug_printf(" %s\n", recipients_list[i].address);
4593 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4594 will just read the headers for the message, and not write anything onto the
4597 message_ended = END_NOTENDED;
4598 more = receive_msg(extract_recipients);
4600 /* more is always FALSE here (not SMTP message) when reading a message
4601 for real; when reading the headers of a message for filter testing,
4602 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4604 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4605 } /* Non-SMTP message reception */
4607 /* If this is a filter testing run, there are headers in store, but
4608 no message on the spool. Run the filtering code in testing mode, setting
4609 the domain to the qualify domain and the local part to the current user,
4610 unless they have been set by options. The prefix and suffix are left unset
4611 unless specified. The the return path is set to to the sender unless it has
4612 already been set from a return-path header in the message. */
4614 if (filter_test != FTEST_NONE)
4616 deliver_domain = (ftest_domain != NULL)?
4617 ftest_domain : qualify_domain_recipient;
4618 deliver_domain_orig = deliver_domain;
4619 deliver_localpart = (ftest_localpart != NULL)?
4620 ftest_localpart : originator_login;
4621 deliver_localpart_orig = deliver_localpart;
4622 deliver_localpart_prefix = ftest_prefix;
4623 deliver_localpart_suffix = ftest_suffix;
4624 deliver_home = originator_home;
4626 if (return_path == NULL)
4628 printf("Return-path copied from sender\n");
4629 return_path = string_copy(sender_address);
4633 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4635 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4637 receive_add_recipient(
4638 string_sprintf("%s%s%s@%s",
4639 (ftest_prefix == NULL)? US"" : ftest_prefix,
4641 (ftest_suffix == NULL)? US"" : ftest_suffix,
4642 deliver_domain), -1);
4644 printf("Recipient = %s\n", recipients_list[0].address);
4645 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4646 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4648 (void)chdir("/"); /* Get away from wherever the user is running this from */
4650 /* Now we run either a system filter test, or a user filter test, or both.
4651 In the latter case, headers added by the system filter will persist and be
4652 available to the user filter. We need to copy the filter variables
4655 if ((filter_test & FTEST_SYSTEM) != 0)
4657 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4658 exim_exit(EXIT_FAILURE);
4661 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4663 if ((filter_test & FTEST_USER) != 0)
4665 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4666 exim_exit(EXIT_FAILURE);
4669 exim_exit(EXIT_SUCCESS);
4672 /* Else act on the result of message reception. We should not get here unless
4673 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4674 TRUE. If it is not, check on the number of messages received in this
4675 connection. If that's OK and queue_only_load is set, check that the load
4676 average is below it. If it is not, set local_queue_only TRUE. Note that it
4677 then remains this way for any subsequent messages on the same SMTP connection.
4678 This is a deliberate choice; even though the load average may fall, it
4679 doesn't seem right to deliver later messages on the same call when not
4680 delivering earlier ones. */
4682 if (!local_queue_only)
4684 if (smtp_accept_queue_per_connection > 0 &&
4685 receive_messagecount > smtp_accept_queue_per_connection)
4687 local_queue_only = TRUE;
4688 queue_only_reason = 2;
4690 else if (queue_only_load >= 0)
4692 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4693 if (local_queue_only) queue_only_reason = 3;
4697 /* If running as an MUA wrapper, all queueing options and freezing options
4701 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4703 /* Log the queueing here, when it will get a message id attached, but
4704 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4707 if (local_queue_only) switch(queue_only_reason)
4710 log_write(L_delay_delivery,
4711 LOG_MAIN, "no immediate delivery: more than %d messages "
4712 "received in one connection", smtp_accept_queue_per_connection);
4716 log_write(L_delay_delivery,
4717 LOG_MAIN, "no immediate delivery: load average %.2f",
4718 (double)load_average/1000.0);
4722 /* Else do the delivery unless the ACL or local_scan() called for queue only
4723 or froze the message. Always deliver in a separate process. A fork failure is
4724 not a disaster, as the delivery will eventually happen on a subsequent queue
4725 run. The search cache must be tidied before the fork, as the parent will
4726 do it before exiting. The child will trigger a lookup failure and
4727 thereby defer the delivery if it tries to use (for example) a cached ldap
4728 connection that the parent has called unbind on. */
4730 else if (!queue_only_policy && !deliver_freeze)
4735 if ((pid = fork()) == 0)
4738 close_unwanted(); /* Close unwanted file descriptors and TLS */
4739 exim_nullstd(); /* Ensure std{in,out,err} exist */
4741 /* Occasionally in the test harness we don't have synchronous delivery
4742 set (can happen with bounces). In that case, let the old process finish
4743 before continuing, to keep the debug output the same. */
4745 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4747 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4748 mode, deliver_drop_privilege is forced TRUE). */
4750 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4752 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4754 /* Control does not return here. */
4757 /* No need to re-exec */
4759 rc = deliver_message(message_id, FALSE, FALSE);
4761 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4762 EXIT_SUCCESS : EXIT_FAILURE);
4767 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4768 "process: %s", strerror(errno));
4771 /* In the parent, wait if synchronous delivery is required. This will
4772 always be the case in MUA wrapper mode. */
4774 else if (synchronous_delivery)
4777 while (wait(&status) != pid);
4778 if ((status & 0x00ff) != 0)
4779 log_write(0, LOG_MAIN|LOG_PANIC,
4780 "process %d crashed with signal %d while delivering %s",
4781 (int)pid, status & 0x00ff, message_id);
4782 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4786 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4787 automatically reaps children (see comments above the loop), clear away any
4788 finished subprocesses here, in case there are lots of messages coming in
4789 from the same source. */
4791 #ifndef SIG_IGN_WORKS
4792 while (waitpid(-1, NULL, WNOHANG) > 0);
4796 exim_exit(EXIT_SUCCESS); /* Never returns */
4797 return 0; /* To stop compiler warning */