1 /* $Cambridge: exim/src/src/exim.c,v 1.29 2005/10/20 14:03:22 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
402 for (i = 0; i <= 2; i++)
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) (void)dup2(devnull, i);
412 if (devnull > 2) (void)close(devnull);
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
441 Exception: We do want it for synchronous delivery!
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
460 tls_close(FALSE); /* Shut down the TLS library */
462 (void)close(fileno(smtp_in));
463 (void)close(fileno(smtp_out));
468 (void)close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
472 if (!synchronous_delivery)
485 /*************************************************
487 *************************************************/
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
501 Returns: nothing; bombs out on failure
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
512 /* At least one OS returns +1 for initgroups failure, so just check for
517 struct passwd *pw = getpwuid(uid);
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
528 if (setgid(gid) < 0 || setuid(uid) < 0)
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
535 /* Debugging output included uid/gid and all groups */
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
550 else debug_printf(" <none>");
558 /*************************************************
560 *************************************************/
562 /* Exim exits via this function so that it always clears up any open
568 Returns: does not return
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address, and terminates it before the
590 port data when a port is extracted.
593 address the address, with possible port on the end
595 Returns: the port, or zero if there isn't one
596 bombs out on a syntax error
600 check_port(uschar *address)
602 int port = host_address_extract_port(address);
603 if (string_is_ip_address(address, NULL) == 0)
605 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
613 /*************************************************
614 * Test/verify an address *
615 *************************************************/
617 /* This function is called by the -bv and -bt code. It extracts a working
618 address from a full RFC 822 address. This isn't really necessary per se, but it
619 has the effect of collapsing source routes.
623 flags flag bits for verify_address()
624 exit_value to be set for failures
630 test_address(uschar *s, int flags, int *exit_value)
632 int start, end, domain;
633 uschar *parse_error = NULL;
634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
638 fprintf(stdout, "syntax error: %s\n", parse_error);
643 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
644 -1, -1, NULL, NULL, NULL);
645 if (rc == FAIL) *exit_value = 2;
646 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
652 /*************************************************
653 * Decode bit settings for log/debug *
654 *************************************************/
656 /* This function decodes a string containing bit settings in the form of +name
657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
658 also recognizes a numeric setting of the form =<number>, but this is not
659 intended for user use. It's an easy way for Exim to pass the debug settings
660 when it is re-exec'ed.
662 The log options are held in two unsigned ints (because there became too many
663 for one). The top bit in the table means "put in 2nd selector". This does not
664 yet apply to debug options, so the "=" facility sets only the first selector.
666 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
667 It sets all the bits in both selectors. However, there is a facility for then
668 unsetting certain bits, because we want to turn off "memory" in the debug case.
670 A bad value for a debug setting is treated as an unknown option - error message
671 to stderr and die. For log settings, which come from the configuration file,
672 we write to the log on the way out...
675 selector1 address of the first bit string
676 selector2 address of the second bit string, or NULL
677 notall1 bits to exclude from "all" for selector1
678 notall2 bits to exclude from "all" for selector2
679 string the configured string
680 options the table of option names
682 which "log" or "debug"
684 Returns: nothing on success - bomb out on failure
688 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
689 int notall2, uschar *string, bit_table *options, int count, uschar *which)
692 if (string == NULL) return;
696 char *end; /* Not uschar */
697 *selector1 = strtoul(CS string+1, &end, 0);
698 if (*end == 0) return;
699 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
704 /* Handle symbolic setting */
711 bit_table *start, *end;
713 while (isspace(*string)) string++;
714 if (*string == 0) return;
716 if (*string != '+' && *string != '-')
718 errmsg = string_sprintf("malformed %s_selector setting: "
719 "+ or - expected but found \"%s\"", which, string);
723 adding = *string++ == '+';
725 while (isalnum(*string) || *string == '_') string++;
729 end = options + count;
733 bit_table *middle = start + (end - start)/2;
734 int c = Ustrncmp(s, middle->name, len);
737 if (middle->name[len] != 0) c = -1; else
739 unsigned int bit = middle->bit;
740 unsigned int *selector;
742 /* The value with all bits set means "force all bits in both selectors"
743 in the case where two are being handled. However, the top bit in the
744 second selector is never set. When setting, some bits can be excluded.
747 if (bit == 0xffffffff)
751 *selector1 = 0xffffffff ^ notall1;
752 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
757 if (selector2 != NULL) *selector2 = 0;
761 /* Otherwise, the 0x80000000 bit means "this value, without the top
762 bit, belongs in the second selector". */
766 if ((bit & 0x80000000) != 0)
768 selector = selector2;
771 else selector = selector1;
772 if (adding) *selector |= bit; else *selector &= ~bit;
774 break; /* Out of loop to match selector name */
777 if (c < 0) end = middle; else start = middle + 1;
778 } /* Loop to match selector name */
782 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
783 adding? '+' : '-', len, s);
786 } /* Loop for selector names */
788 /* Handle disasters */
791 if (Ustrcmp(which, "debug") == 0)
793 fprintf(stderr, "exim: %s\n", errmsg);
796 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
801 /*************************************************
802 * Show supported features *
803 *************************************************/
805 /* This function is called for -bV and for -d to output the optional features
806 of the current Exim binary.
808 Arguments: a FILE for printing
813 show_whats_supported(FILE *f)
815 #ifdef DB_VERSION_STRING
816 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
817 #elif defined(BTREEVERSION) && defined(HASHVERSION)
819 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
821 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
823 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
824 fprintf(f, "Probably ndbm\n");
825 #elif defined(USE_TDB)
826 fprintf(f, "Using tdb\n");
829 fprintf(f, "Probably GDBM (native mode)\n");
831 fprintf(f, "Probably GDBM (compatibility mode)\n");
835 fprintf(f, "Support for:");
836 #ifdef SUPPORT_CRYPTEQ
837 fprintf(f, " crypteq");
840 fprintf(f, " iconv()");
852 fprintf(f, " Expand_dlfunc");
854 #ifdef USE_TCP_WRAPPERS
855 fprintf(f, " TCPwrappers");
859 fprintf(f, " GnuTLS");
861 fprintf(f, " OpenSSL");
864 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
865 fprintf(f, " translate_ip_address");
867 #ifdef WITH_CONTENT_SCAN
868 fprintf(f, " Content_Scanning");
870 #ifdef WITH_OLD_DEMIME
871 fprintf(f, " Old_Demime");
873 #ifdef EXPERIMENTAL_SPF
874 fprintf(f, " Experimental_SPF");
876 #ifdef EXPERIMENTAL_SRS
877 fprintf(f, " Experimental_SRS");
879 #ifdef EXPERIMENTAL_BRIGHTMAIL
880 fprintf(f, " Experimental_Brightmail");
882 #ifdef EXPERIMENTAL_DOMAINKEYS
883 fprintf(f, " Experimental_DomainKeys");
887 fprintf(f, "Lookups:");
888 #ifdef LOOKUP_LSEARCH
889 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
895 fprintf(f, " dbm dbmnz");
898 fprintf(f, " dnsdb");
900 #ifdef LOOKUP_DSEARCH
901 fprintf(f, " dsearch");
904 fprintf(f, " ibase");
907 fprintf(f, " ldap ldapdn ldapm");
910 fprintf(f, " mysql");
913 fprintf(f, " nis nis0");
915 #ifdef LOOKUP_NISPLUS
916 fprintf(f, " nisplus");
919 fprintf(f, " oracle");
922 fprintf(f, " passwd");
925 fprintf(f, " pgsql");
928 fprintf(f, " sqlite");
931 fprintf(f, " testdb");
934 fprintf(f, " whoson");
938 fprintf(f, "Authenticators:");
940 fprintf(f, " cram_md5");
942 #ifdef AUTH_CYRUS_SASL
943 fprintf(f, " cyrus_sasl");
945 #ifdef AUTH_PLAINTEXT
946 fprintf(f, " plaintext");
953 fprintf(f, "Routers:");
955 fprintf(f, " accept");
957 #ifdef ROUTER_DNSLOOKUP
958 fprintf(f, " dnslookup");
960 #ifdef ROUTER_IPLITERAL
961 fprintf(f, " ipliteral");
963 #ifdef ROUTER_IPLOOKUP
964 fprintf(f, " iplookup");
966 #ifdef ROUTER_MANUALROUTE
967 fprintf(f, " manualroute");
969 #ifdef ROUTER_QUERYPROGRAM
970 fprintf(f, " queryprogram");
972 #ifdef ROUTER_REDIRECT
973 fprintf(f, " redirect");
977 fprintf(f, "Transports:");
978 #ifdef TRANSPORT_APPENDFILE
979 fprintf(f, " appendfile");
980 #ifdef SUPPORT_MAILDIR
981 fprintf(f, "/maildir");
983 #ifdef SUPPORT_MAILSTORE
984 fprintf(f, "/mailstore");
990 #ifdef TRANSPORT_AUTOREPLY
991 fprintf(f, " autoreply");
993 #ifdef TRANSPORT_LMTP
996 #ifdef TRANSPORT_PIPE
999 #ifdef TRANSPORT_SMTP
1000 fprintf(f, " smtp");
1004 if (fixed_never_users[0] > 0)
1007 fprintf(f, "Fixed never_users: ");
1008 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1009 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1010 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1017 /*************************************************
1018 * Quote a local part *
1019 *************************************************/
1021 /* This function is used when a sender address or a From: or Sender: header
1022 line is being created from the caller's login, or from an authenticated_id. It
1023 applies appropriate quoting rules for a local part.
1025 Argument: the local part
1026 Returns: the local part, quoted if necessary
1030 local_part_quote(uschar *lpart)
1032 BOOL needs_quote = FALSE;
1037 for (t = lpart; !needs_quote && *t != 0; t++)
1039 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1040 (*t != '.' || t == lpart || t[1] == 0);
1043 if (!needs_quote) return lpart;
1046 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1050 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1053 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1056 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1057 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1058 yield = string_cat(yield, &size, &ptr, nq, 1);
1062 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1070 /*************************************************
1071 * Load readline() functions *
1072 *************************************************/
1074 /* This function is called from testing executions that read data from stdin,
1075 but only when running as the calling user. Currently, only -be does this. The
1076 function loads the readline() function library and passes back the functions.
1077 On some systems, it needs the curses library, so load that too, but try without
1078 it if loading fails. All this functionality has to be requested at build time.
1081 fn_readline_ptr pointer to where to put the readline pointer
1082 fn_addhist_ptr pointer to where to put the addhistory function
1084 Returns: the dlopen handle or NULL on failure
1088 set_readline(char * (**fn_readline_ptr)(char *),
1089 char * (**fn_addhist_ptr)(char *))
1092 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1094 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1095 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1097 if (dlhandle != NULL)
1099 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1100 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1104 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1113 /*************************************************
1114 * Get a line from stdin for testing things *
1115 *************************************************/
1117 /* This function is called when running tests that can take a number of lines
1118 of input (for example, -be and -bt). It handles continuations and trailing
1119 spaces. And prompting and a blank line output on eof. If readline() is in use,
1120 the arguments are non-NULL and provide the relevant functions.
1123 fn_readline readline function or NULL
1124 fn_addhist addhist function or NULL
1126 Returns: pointer to dynamic memory, or NULL at end of file
1130 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1135 uschar *yield = NULL;
1137 if (fn_readline == NULL) printf("> ");
1141 uschar buffer[1024];
1145 char *readline_line = NULL;
1146 if (fn_readline != NULL)
1148 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1149 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1150 p = US readline_line;
1155 /* readline() not in use */
1158 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1162 /* Handle the line */
1164 ss = p + (int)Ustrlen(p);
1165 while (ss > p && isspace(ss[-1])) ss--;
1169 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1172 yield = string_cat(yield, &size, &ptr, p, ss - p);
1175 if (fn_readline != NULL) free(readline_line);
1178 if (ss == p || yield[ptr-1] != '\\')
1186 if (yield == NULL) printf("\n");
1192 /*************************************************
1193 * Entry point and high-level code *
1194 *************************************************/
1196 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1197 the appropriate action. All the necessary functions are present in the one
1198 binary. I originally thought one should split it up, but it turns out that so
1199 much of the apparatus is needed in each chunk that one might as well just have
1200 it all available all the time, which then makes the coding easier as well.
1203 argc count of entries in argv
1204 argv argument strings, with argv[0] being the program name
1206 Returns: EXIT_SUCCESS if terminated successfully
1207 EXIT_FAILURE otherwise, except when a message has been sent
1208 to the sender, and -oee was given
1212 main(int argc, char **cargv)
1214 uschar **argv = USS cargv;
1215 int arg_receive_timeout = -1;
1216 int arg_smtp_receive_timeout = -1;
1217 int arg_error_handling = error_handling;
1218 int filter_sfd = -1;
1219 int filter_ufd = -1;
1222 int list_queue_option = 0;
1224 int msg_action_arg = -1;
1225 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1226 int queue_only_reason = 0;
1228 int perl_start_option = 0;
1230 int recipients_arg = argc;
1231 int sender_address_domain = 0;
1232 int test_retry_arg = -1;
1233 int test_rewrite_arg = -1;
1234 BOOL arg_queue_only = FALSE;
1235 BOOL bi_option = FALSE;
1236 BOOL checking = FALSE;
1237 BOOL count_queue = FALSE;
1238 BOOL expansion_test = FALSE;
1239 BOOL extract_recipients = FALSE;
1240 BOOL forced_delivery = FALSE;
1241 BOOL f_end_dot = FALSE;
1242 BOOL deliver_give_up = FALSE;
1243 BOOL list_queue = FALSE;
1244 BOOL list_options = FALSE;
1245 BOOL local_queue_only;
1247 BOOL one_msg_action = FALSE;
1248 BOOL queue_only_set = FALSE;
1249 BOOL receiving_message = TRUE;
1251 BOOL removed_privilege = FALSE;
1252 BOOL verify_address_mode = FALSE;
1253 BOOL verify_as_sender = FALSE;
1254 BOOL version_printed = FALSE;
1255 uschar *alias_arg = NULL;
1256 uschar *called_as = US"";
1257 uschar *start_queue_run_id = NULL;
1258 uschar *stop_queue_run_id = NULL;
1259 uschar *ftest_domain = NULL;
1260 uschar *ftest_localpart = NULL;
1261 uschar *ftest_prefix = NULL;
1262 uschar *ftest_suffix = NULL;
1263 uschar *real_sender_address;
1264 uschar *originator_home = US"/";
1268 struct stat statbuf;
1269 pid_t passed_qr_pid = (pid_t)0;
1270 int passed_qr_pipe = -1;
1271 gid_t group_list[NGROUPS_MAX];
1273 /* Possible options for -R and -S */
1275 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1277 /* Need to define this in case we need to change the environment in order
1278 to get rid of a bogus time zone. We have to make it char rather than uschar
1279 because some OS define it in /usr/include/unistd.h. */
1281 extern char **environ;
1283 /* If the Exim user and/or group and/or the configuration file owner/group were
1284 defined by ref:name at build time, we must now find the actual uid/gid values.
1285 This is a feature to make the lives of binary distributors easier. */
1287 #ifdef EXIM_USERNAME
1288 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1290 exim_gid = pw->pw_gid;
1294 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1300 #ifdef EXIM_GROUPNAME
1301 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1303 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1309 #ifdef CONFIGURE_OWNERNAME
1310 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1312 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1313 CONFIGURE_OWNERNAME);
1318 #ifdef CONFIGURE_GROUPNAME
1319 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1321 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1322 CONFIGURE_GROUPNAME);
1327 /* In the Cygwin environment, some initialization needs doing. It is fudged
1328 in by means of this macro. */
1334 /* Check a field which is patched when we are running Exim within its
1335 testing harness; do a fast initial check, and then the whole thing. */
1337 running_in_test_harness =
1338 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1340 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1341 at the start of a program; however, it seems that some environments do not
1342 follow this. A "strange" locale can affect the formatting of timestamps, so we
1345 setlocale(LC_ALL, "C");
1347 /* Set up the default handler for timing using alarm(). */
1349 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1351 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1352 because store_malloc writes a log entry on failure. */
1354 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1355 if (log_buffer == NULL)
1357 fprintf(stderr, "exim: failed to get store for log buffer\n");
1361 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1362 NULL when the daemon is run and the file is closed. We have to use this
1363 indirection, because some systems don't allow writing to the variable "stderr".
1366 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1368 /* Arrange for the PCRE regex library to use our store functions. Note that
1369 the normal calls are actually macros that add additional arguments for
1370 debugging purposes so we have to assign specially constructed functions here.
1371 The default is to use store in the stacking pool, but this is overridden in the
1372 regex_must_compile() function. */
1374 pcre_malloc = function_store_get;
1375 pcre_free = function_dummy_free;
1377 /* Ensure there is a big buffer for temporary use in several places. It is put
1378 in malloc store so that it can be freed for enlargement if necessary. */
1380 big_buffer = store_malloc(big_buffer_size);
1382 /* Set up the handler for the data request signal, and set the initial
1383 descriptive text. */
1385 set_process_info("initializing");
1386 os_restarting_signal(SIGUSR1, usr1_handler);
1388 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1389 in the daemon code. For the rest of Exim's uses, we ignore it. */
1391 signal(SIGHUP, SIG_IGN);
1393 /* We don't want to die on pipe errors as the code is written to handle
1394 the write error instead. */
1396 signal(SIGPIPE, SIG_IGN);
1398 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1399 set to SIG_IGN. This causes subprocesses that complete before the parent
1400 process waits for them not to hang around, so when Exim calls wait(), nothing
1401 is there. The wait() code has been made robust against this, but let's ensure
1402 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1403 ending status. We use sigaction rather than plain signal() on those OS where
1404 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1405 problem on AIX with this.) */
1409 struct sigaction act;
1410 act.sa_handler = SIG_DFL;
1411 sigemptyset(&(act.sa_mask));
1413 sigaction(SIGCHLD, &act, NULL);
1416 signal(SIGCHLD, SIG_DFL);
1419 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1424 /* Set up the version number. Set up the leading 'E' for the external form of
1425 message ids, set the pointer to the internal form, and initialize it to
1426 indicate no message being processed. */
1429 message_id_option[0] = '-';
1430 message_id_external = message_id_option + 1;
1431 message_id_external[0] = 'E';
1432 message_id = message_id_external + 1;
1435 /* Set the umask to zero so that any files that Exim creates are created
1436 with the modes that it specifies. */
1440 /* Precompile the regular expression for matching a message id. Keep this in
1441 step with the code that generates ids in the accept.c module. We need to do
1442 this here, because the -M options check their arguments for syntactic validity
1443 using mac_ismsgid, which uses this. */
1446 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1448 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1449 this seems to be a generally accepted convention, since one finds symbolic
1450 links called "mailq" in standard OS configurations. */
1452 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1453 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1456 receiving_message = FALSE;
1457 called_as = US"-mailq";
1460 /* If the program is called as "rmail" treat it as equivalent to
1461 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1462 i.e. preventing a single dot on a line from terminating the message, and
1463 returning with zero return code, even in cases of error (provided an error
1464 message has been sent). */
1466 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1467 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1470 called_as = US"-rmail";
1471 errors_sender_rc = EXIT_SUCCESS;
1474 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1475 this is a smail convention. */
1477 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1478 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1480 smtp_input = smtp_batched_input = TRUE;
1481 called_as = US"-rsmtp";
1484 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1485 this is a smail convention. */
1487 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1488 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1491 receiving_message = FALSE;
1492 called_as = US"-runq";
1495 /* If the program is called as "newaliases" treat it as equivalent to
1496 "exim -bi"; this is a sendmail convention. */
1498 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1499 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1502 receiving_message = FALSE;
1503 called_as = US"-newaliases";
1506 /* Save the original effective uid for a couple of uses later. It should
1507 normally be root, but in some esoteric environments it may not be. */
1509 original_euid = geteuid();
1511 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1512 to be the same as the real ones. This makes a difference only if Exim is setuid
1513 (or setgid) to something other than root, which could be the case in some
1514 special configurations. */
1516 real_uid = getuid();
1517 real_gid = getgid();
1519 if (real_uid == root_uid)
1525 /* If neither the original real uid nor the original euid was root, Exim is
1526 running in an unprivileged state. */
1528 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1530 /* If the first argument is --help, pretend there are no arguments. This will
1531 cause a brief message to be given. */
1533 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1535 /* Scan the program's arguments. Some can be dealt with right away; others are
1536 simply recorded for checking and handling afterwards. Do a high-level switch
1537 on the second character (the one after '-'), to save some effort. */
1539 for (i = 1; i < argc; i++)
1541 BOOL badarg = FALSE;
1542 uschar *arg = argv[i];
1546 /* An argument not starting with '-' is the start of a recipients list;
1547 break out of the options-scanning loop. */
1555 /* An option consistion of -- terminates the options */
1557 if (Ustrcmp(arg, "--") == 0)
1559 recipients_arg = i + 1;
1563 /* Handle flagged options */
1565 switchchar = arg[1];
1568 /* Make all -ex options synonymous with -oex arguments, since that
1569 is assumed by various callers. Also make -qR options synonymous with -R
1570 options, as that seems to be required as well. Allow for -qqR too, and
1571 the same for -S options. */
1573 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1574 Ustrncmp(arg+1, "qR", 2) == 0 ||
1575 Ustrncmp(arg+1, "qS", 2) == 0)
1577 switchchar = arg[2];
1580 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1582 switchchar = arg[3];
1584 queue_2stage = TRUE;
1587 /* Make -r synonymous with -f, since it is a documented alias */
1589 else if (arg[1] == 'r') switchchar = 'f';
1591 /* Make -ov synonymous with -v */
1593 else if (Ustrcmp(arg, "-ov") == 0)
1599 /* High-level switch on active initial letter */
1603 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1604 so has no need of it. */
1607 if (*argrest == 0) i++; /* Skip over the type */
1612 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1614 /* -bd: Run in daemon mode, awaiting SMTP connections.
1615 -bdf: Ditto, but in the foreground.
1618 if (*argrest == 'd')
1620 daemon_listen = TRUE;
1621 if (*(++argrest) == 'f') background_daemon = FALSE;
1622 else if (*argrest != 0) { badarg = TRUE; break; }
1625 /* -be: Run in expansion test mode */
1627 else if (*argrest == 'e')
1628 expansion_test = checking = TRUE;
1630 /* -bF: Run system filter test */
1632 else if (*argrest == 'F')
1634 filter_test |= FTEST_SYSTEM;
1635 if (*(++argrest) != 0) { badarg = TRUE; break; }
1636 if (++i < argc) filter_test_sfile = argv[i]; else
1638 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1643 /* -bf: Run user filter test
1644 -bfd: Set domain for filter testing
1645 -bfl: Set local part for filter testing
1646 -bfp: Set prefix for filter testing
1647 -bfs: Set suffix for filter testing
1650 else if (*argrest == 'f')
1652 if (*(++argrest) == 0)
1654 filter_test |= FTEST_USER;
1655 if (++i < argc) filter_test_ufile = argv[i]; else
1657 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1665 fprintf(stderr, "exim: string expected after %s\n", arg);
1668 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1669 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1670 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1671 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1672 else { badarg = TRUE; break; }
1676 /* -bh: Host checking - an IP address must follow. */
1678 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1680 if (++i >= argc) { badarg = TRUE; break; }
1681 sender_host_address = argv[i];
1682 host_checking = checking = log_testing_mode = TRUE;
1683 host_checking_callout = argrest[1] == 'c';
1686 /* -bi: This option is used by sendmail to initialize *the* alias file,
1687 though it has the -oA option to specify a different file. Exim has no
1688 concept of *the* alias file, but since Sun's YP make script calls
1689 sendmail this way, some support must be provided. */
1691 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1693 /* -bm: Accept and deliver message - the default option. Reinstate
1694 receiving_message, which got turned off for all -b options. */
1696 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1698 /* -bnq: For locally originating messages, do not qualify unqualified
1699 addresses. In the envelope, this causes errors; in header lines they
1702 else if (Ustrcmp(argrest, "nq") == 0)
1704 allow_unqualified_sender = FALSE;
1705 allow_unqualified_recipient = FALSE;
1708 /* -bpxx: List the contents of the mail queue, in various forms. If
1709 the option is -bpc, just a queue count is needed. Otherwise, if the
1710 first letter after p is r, then order is random. */
1712 else if (*argrest == 'p')
1714 if (*(++argrest) == 'c')
1717 if (*(++argrest) != 0) badarg = TRUE;
1721 if (*argrest == 'r')
1723 list_queue_option = 8;
1726 else list_queue_option = 0;
1730 /* -bp: List the contents of the mail queue, top-level only */
1732 if (*argrest == 0) {}
1734 /* -bpu: List the contents of the mail queue, top-level undelivered */
1736 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1738 /* -bpa: List the contents of the mail queue, including all delivered */
1740 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1742 /* Unknown after -bp[r] */
1752 /* -bP: List the configuration variables given as the address list.
1753 Force -v, so configuration errors get displayed. */
1755 else if (Ustrcmp(argrest, "P") == 0)
1757 list_options = TRUE;
1758 debug_selector |= D_v;
1759 debug_file = stderr;
1762 /* -brt: Test retry configuration lookup */
1764 else if (Ustrcmp(argrest, "rt") == 0)
1766 test_retry_arg = i + 1;
1770 /* -brw: Test rewrite configuration */
1772 else if (Ustrcmp(argrest, "rw") == 0)
1774 test_rewrite_arg = i + 1;
1778 /* -bS: Read SMTP commands on standard input, but produce no replies -
1779 all errors are reported by sending messages. */
1781 else if (Ustrcmp(argrest, "S") == 0)
1782 smtp_input = smtp_batched_input = receiving_message = TRUE;
1784 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1785 on standard output. */
1787 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1789 /* -bt: address testing mode */
1791 else if (Ustrcmp(argrest, "t") == 0)
1792 address_test_mode = checking = log_testing_mode = TRUE;
1794 /* -bv: verify addresses */
1796 else if (Ustrcmp(argrest, "v") == 0)
1797 verify_address_mode = checking = log_testing_mode = TRUE;
1799 /* -bvs: verify sender addresses */
1801 else if (Ustrcmp(argrest, "vs") == 0)
1803 verify_address_mode = checking = log_testing_mode = TRUE;
1804 verify_as_sender = TRUE;
1807 /* -bV: Print version string and support details */
1809 else if (Ustrcmp(argrest, "V") == 0)
1811 printf("Exim version %s #%s built %s\n", version_string,
1812 version_cnumber, version_date);
1813 printf("%s\n", CS version_copyright);
1814 version_printed = TRUE;
1815 show_whats_supported(stdout);
1822 /* -C: change configuration file list; ignore if it isn't really
1823 a change! Enforce a prefix check if required. */
1828 if(++i < argc) argrest = argv[i]; else
1829 { badarg = TRUE; break; }
1831 if (Ustrcmp(config_main_filelist, argrest) != 0)
1833 #ifdef ALT_CONFIG_PREFIX
1835 int len = Ustrlen(ALT_CONFIG_PREFIX);
1836 uschar *list = argrest;
1838 while((filename = string_nextinlist(&list, &sep, big_buffer,
1839 big_buffer_size)) != NULL)
1841 if ((Ustrlen(filename) < len ||
1842 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1843 Ustrstr(filename, "/../") != NULL) &&
1844 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1846 fprintf(stderr, "-C Permission denied\n");
1852 config_main_filelist = argrest;
1853 config_changed = TRUE;
1858 /* -D: set up a macro definition */
1861 #ifdef DISABLE_D_OPTION
1862 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1867 macro_item *mlast = NULL;
1870 uschar *s = argrest;
1872 while (isspace(*s)) s++;
1874 if (*s < 'A' || *s > 'Z')
1876 fprintf(stderr, "exim: macro name set by -D must start with "
1877 "an upper case letter\n");
1881 while (isalnum(*s) || *s == '_')
1883 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1887 if (ptr == 0) { badarg = TRUE; break; }
1888 while (isspace(*s)) s++;
1891 if (*s++ != '=') { badarg = TRUE; break; }
1892 while (isspace(*s)) s++;
1895 for (m = macros; m != NULL; m = m->next)
1897 if (Ustrcmp(m->name, name) == 0)
1899 fprintf(stderr, "exim: duplicated -D in command line\n");
1905 m = store_get(sizeof(macro_item) + Ustrlen(name));
1907 m->command_line = TRUE;
1908 if (mlast == NULL) macros = m; else mlast->next = m;
1909 Ustrcpy(m->name, name);
1910 m->replacement = string_copy(s);
1912 if (clmacro_count >= MAX_CLMACROS)
1914 fprintf(stderr, "exim: too many -D options on command line\n");
1917 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1923 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1924 The latter is now a no-op, retained for compatibility only. If -dd is used,
1925 debugging subprocesses of the daemon is disabled. */
1928 if (Ustrcmp(argrest, "ropcr") == 0)
1930 /* drop_cr = TRUE; */
1933 /* Use an intermediate variable so that we don't set debugging while
1934 decoding the debugging bits. */
1938 unsigned int selector = D_default;
1941 if (*argrest == 'd')
1943 debug_daemon = TRUE;
1947 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1948 debug_options_count, US"debug");
1949 debug_selector = selector;
1954 /* -E: This is a local error message. This option is not intended for
1955 external use at all, but is not restricted to trusted callers because it
1956 does no harm (just suppresses certain error messages) and if Exim is run
1957 not setuid root it won't always be trusted when it generates error
1958 messages using this option. If there is a message id following -E, point
1959 message_reference at it, for logging. */
1962 local_error_message = TRUE;
1963 if (mac_ismsgid(argrest)) message_reference = argrest;
1967 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1968 option, so it looks as if historically the -oex options are also callable
1969 without the leading -o. So we have to accept them. Before the switch,
1970 anything starting -oe has been converted to -e. Exim does not support all
1971 of the sendmail error options. */
1974 if (Ustrcmp(argrest, "e") == 0)
1976 arg_error_handling = ERRORS_SENDER;
1977 errors_sender_rc = EXIT_SUCCESS;
1979 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1980 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1981 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1982 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1987 /* -F: Set sender's full name, used instead of the gecos entry from
1988 the password file. Since users can usually alter their gecos entries,
1989 there's no security involved in using this instead. The data can follow
1990 the -F or be in the next argument. */
1995 if(++i < argc) argrest = argv[i]; else
1996 { badarg = TRUE; break; }
1998 originator_name = argrest;
1999 sender_name_forced = TRUE;
2003 /* -f: Set sender's address - this value is only actually used if Exim is
2004 run by a trusted user, or if untrusted_set_sender is set and matches the
2005 address, except that the null address can always be set by any user. The
2006 test for this happens later, when the value given here is ignored when not
2007 permitted. For an untrusted user, the actual sender is still put in Sender:
2008 if it doesn't match the From: header (unless no_local_from_check is set).
2009 The data can follow the -f or be in the next argument. The -r switch is an
2010 obsolete form of -f but since there appear to be programs out there that
2011 use anything that sendmail has ever supported, better accept it - the
2012 synonymizing is done before the switch above.
2014 At this stage, we must allow domain literal addresses, because we don't
2015 know what the setting of allow_domain_literals is yet. Ditto for trailing
2016 dots and strip_trailing_dot. */
2024 if (i+1 < argc) argrest = argv[++i]; else
2025 { badarg = TRUE; break; }
2029 sender_address = string_sprintf(""); /* Ensure writeable memory */
2033 uschar *temp = argrest + Ustrlen(argrest) - 1;
2034 while (temp >= argrest && isspace(*temp)) temp--;
2035 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2036 allow_domain_literals = TRUE;
2037 strip_trailing_dot = TRUE;
2038 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2039 &sender_address_domain, TRUE);
2040 allow_domain_literals = FALSE;
2041 strip_trailing_dot = FALSE;
2042 if (sender_address == NULL)
2044 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2045 return EXIT_FAILURE;
2048 sender_address_forced = TRUE;
2052 /* This is some Sendmail thing which can be ignored */
2057 /* -h: Set the hop count for an incoming message. Exim does not currently
2058 support this; it always computes it by counting the Received: headers.
2059 To put it in will require a change to the spool header file format. */
2064 if(++i < argc) argrest = argv[i]; else
2065 { badarg = TRUE; break; }
2067 if (!isdigit(*argrest)) badarg = TRUE;
2071 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2072 not to be documented for sendmail but mailx (at least) uses it) */
2075 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2080 receiving_message = FALSE;
2082 /* -MC: continue delivery of another message via an existing open
2083 file descriptor. This option is used for an internal call by the
2084 smtp transport when there is a pending message waiting to go to an
2085 address to which it has got a connection. Five subsequent arguments are
2086 required: transport name, host name, IP address, sequence number, and
2087 message_id. Transports may decline to create new processes if the sequence
2088 number gets too big. The channel is stdin. This (-MC) must be the last
2089 argument. There's a subsequent check that the real-uid is privileged.
2091 If we are running in the test harness. delay for a bit, to let the process
2092 that set this one up complete. This makes for repeatability of the logging,
2095 if (Ustrcmp(argrest, "C") == 0)
2099 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2100 return EXIT_FAILURE;
2103 if (msg_action_arg >= 0)
2105 fprintf(stderr, "exim: incompatible arguments\n");
2106 return EXIT_FAILURE;
2109 continue_transport = argv[++i];
2110 continue_hostname = argv[++i];
2111 continue_host_address = argv[++i];
2112 continue_sequence = Uatoi(argv[++i]);
2113 msg_action = MSG_DELIVER;
2114 msg_action_arg = ++i;
2115 forced_delivery = TRUE;
2116 queue_run_pid = passed_qr_pid;
2117 queue_run_pipe = passed_qr_pipe;
2119 if (!mac_ismsgid(argv[i]))
2121 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2123 return EXIT_FAILURE;
2126 if (running_in_test_harness) millisleep(500);
2130 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2131 precedes -MC (see above). The flag indicates that the host to which
2132 Exim is connected has accepted an AUTH sequence. */
2134 else if (Ustrcmp(argrest, "CA") == 0)
2136 smtp_authenticated = TRUE;
2140 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2141 it preceded -MC (see above) */
2143 else if (Ustrcmp(argrest, "CP") == 0)
2145 smtp_use_pipelining = TRUE;
2149 /* -MCQ: pass on the pid of the queue-running process that started
2150 this chain of deliveries and the fd of its synchronizing pipe; this
2151 is useful only when it precedes -MC (see above) */
2153 else if (Ustrcmp(argrest, "CQ") == 0)
2155 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2157 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2162 /* -MCS: set the smtp_use_size flag; this is useful only when it
2163 precedes -MC (see above) */
2165 else if (Ustrcmp(argrest, "CS") == 0)
2167 smtp_use_size = TRUE;
2171 /* -MCT: set the tls_offered flag; this is useful only when it
2172 precedes -MC (see above). The flag indicates that the host to which
2173 Exim is connected has offered TLS support. */
2176 else if (Ustrcmp(argrest, "CT") == 0)
2183 /* -M[x]: various operations on the following list of message ids:
2184 -M deliver the messages, ignoring next retry times and thawing
2185 -Mc deliver the messages, checking next retry times, no thawing
2186 -Mf freeze the messages
2187 -Mg give up on the messages
2188 -Mt thaw the messages
2189 -Mrm remove the messages
2190 In the above cases, this must be the last option. There are also the
2191 following options which are followed by a single message id, and which
2192 act on that message. Some of them use the "recipient" addresses as well.
2193 -Mar add recipient(s)
2194 -Mmad mark all recipients delivered
2195 -Mmd mark recipients(s) delivered
2202 else if (*argrest == 0)
2204 msg_action = MSG_DELIVER;
2205 forced_delivery = deliver_force_thaw = TRUE;
2207 else if (Ustrcmp(argrest, "ar") == 0)
2209 msg_action = MSG_ADD_RECIPIENT;
2210 one_msg_action = TRUE;
2212 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2213 else if (Ustrcmp(argrest, "es") == 0)
2215 msg_action = MSG_EDIT_SENDER;
2216 one_msg_action = TRUE;
2218 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2219 else if (Ustrcmp(argrest, "g") == 0)
2221 msg_action = MSG_DELIVER;
2222 deliver_give_up = TRUE;
2224 else if (Ustrcmp(argrest, "mad") == 0)
2226 msg_action = MSG_MARK_ALL_DELIVERED;
2228 else if (Ustrcmp(argrest, "md") == 0)
2230 msg_action = MSG_MARK_DELIVERED;
2231 one_msg_action = TRUE;
2233 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2234 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2235 else if (Ustrcmp(argrest, "vb") == 0)
2237 msg_action = MSG_SHOW_BODY;
2238 one_msg_action = TRUE;
2240 else if (Ustrcmp(argrest, "vh") == 0)
2242 msg_action = MSG_SHOW_HEADER;
2243 one_msg_action = TRUE;
2245 else if (Ustrcmp(argrest, "vl") == 0)
2247 msg_action = MSG_SHOW_LOG;
2248 one_msg_action = TRUE;
2250 else { badarg = TRUE; break; }
2252 /* All the -Mxx options require at least one message id. */
2254 msg_action_arg = i + 1;
2255 if (msg_action_arg >= argc)
2257 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2258 return EXIT_FAILURE;
2261 /* Some require only message ids to follow */
2263 if (!one_msg_action)
2266 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2268 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2270 return EXIT_FAILURE;
2272 goto END_ARG; /* Remaining args are ids */
2275 /* Others require only one message id, possibly followed by addresses,
2276 which will be handled as normal arguments. */
2280 if (!mac_ismsgid(argv[msg_action_arg]))
2282 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2283 argv[msg_action_arg], arg);
2284 return EXIT_FAILURE;
2291 /* Some programs seem to call the -om option without the leading o;
2292 for sendmail it askes for "me too". Exim always does this. */
2295 if (*argrest != 0) badarg = TRUE;
2299 /* -N: don't do delivery - a debugging option that stops transports doing
2300 their thing. It implies debugging at the D_v level. */
2305 dont_deliver = TRUE;
2306 debug_selector |= D_v;
2307 debug_file = stderr;
2313 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2319 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2320 option to the specified value. This form uses long names. We need to handle
2321 -O option=value and -Ooption=value. */
2328 fprintf(stderr, "exim: string expected after -O\n");
2336 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2339 if (*argrest == 'A')
2341 alias_arg = argrest + 1;
2342 if (alias_arg[0] == 0)
2344 if (i+1 < argc) alias_arg = argv[++i]; else
2346 fprintf(stderr, "exim: string expected after -oA\n");
2352 /* -oB: Set a connection message max value for remote deliveries */
2354 else if (*argrest == 'B')
2356 uschar *p = argrest + 1;
2359 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2361 connection_max_messages = 1;
2370 fprintf(stderr, "exim: number expected after -oB\n");
2373 connection_max_messages = Uatoi(p);
2377 /* -odb: background delivery */
2379 else if (Ustrcmp(argrest, "db") == 0)
2381 synchronous_delivery = FALSE;
2382 arg_queue_only = FALSE;
2383 queue_only_set = TRUE;
2386 /* -odf: foreground delivery (smail-compatible option); same effect as
2387 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2390 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2392 synchronous_delivery = TRUE;
2393 arg_queue_only = FALSE;
2394 queue_only_set = TRUE;
2397 /* -odq: queue only */
2399 else if (Ustrcmp(argrest, "dq") == 0)
2401 synchronous_delivery = FALSE;
2402 arg_queue_only = TRUE;
2403 queue_only_set = TRUE;
2406 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2407 but no remote delivery */
2409 else if (Ustrcmp(argrest, "dqs") == 0)
2412 arg_queue_only = FALSE;
2413 queue_only_set = TRUE;
2416 /* -oex: Sendmail error flags. As these are also accepted without the
2417 leading -o prefix, for compatibility with vacation and other callers,
2418 they are handled with -e above. */
2420 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2421 -oitrue: Another sendmail syntax for the same */
2423 else if (Ustrcmp(argrest, "i") == 0 ||
2424 Ustrcmp(argrest, "itrue") == 0)
2427 /* -oM*: Set various characteristics for an incoming message; actually
2428 acted on for trusted callers only. */
2430 else if (*argrest == 'M')
2434 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2438 /* -oMa: Set sender host address */
2440 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2442 /* -oMaa: Set authenticator name */
2444 else if (Ustrcmp(argrest, "Maa") == 0)
2445 sender_host_authenticated = argv[++i];
2447 /* -oMas: setting authenticated sender */
2449 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2451 /* -oMai: setting authenticated id */
2453 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2455 /* -oMi: Set incoming interface address */
2457 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2459 /* -oMr: Received protocol */
2461 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2463 /* -oMs: Set sender host name */
2465 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2467 /* -oMt: Set sender ident */
2469 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2471 /* Else a bad argument */
2480 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2481 seem to call this as -m (undocumented), so that is also accepted (see
2484 else if (Ustrcmp(argrest, "m") == 0) {}
2486 /* -oo: An ancient flag for old-style addresses which still seems to
2487 crop up in some calls (see in SCO). */
2489 else if (Ustrcmp(argrest, "o") == 0) {}
2491 /* -oP <name>: set pid file path for daemon */
2493 else if (Ustrcmp(argrest, "P") == 0)
2494 override_pid_file_path = argv[++i];
2496 /* -or <n>: set timeout for non-SMTP acceptance
2497 -os <n>: set timeout for SMTP acceptance */
2499 else if (*argrest == 'r' || *argrest == 's')
2501 int *tp = (*argrest == 'r')?
2502 &arg_receive_timeout : &arg_smtp_receive_timeout;
2503 if (argrest[1] == 0)
2505 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2507 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2510 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2515 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2517 else if (Ustrcmp(argrest, "X") == 0)
2518 override_local_interfaces = argv[++i];
2520 /* Unknown -o argument */
2526 /* -ps: force Perl startup; -pd force delayed Perl startup */
2530 if (*argrest == 's' && argrest[1] == 0)
2532 perl_start_option = 1;
2535 if (*argrest == 'd' && argrest[1] == 0)
2537 perl_start_option = -1;
2542 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2543 which sets the host protocol and host name */
2547 if (i+1 < argc) argrest = argv[++i]; else
2548 { badarg = TRUE; break; }
2553 uschar *hn = Ustrchr(argrest, ':');
2556 received_protocol = argrest;
2560 received_protocol = string_copyn(argrest, hn - argrest);
2561 sender_host_name = hn + 1;
2568 receiving_message = FALSE;
2570 /* -qq...: Do queue runs in a 2-stage manner */
2572 if (*argrest == 'q')
2574 queue_2stage = TRUE;
2578 /* -qi...: Do only first (initial) deliveries */
2580 if (*argrest == 'i')
2582 queue_run_first_delivery = TRUE;
2586 /* -qf...: Run the queue, forcing deliveries
2587 -qff..: Ditto, forcing thawing as well */
2589 if (*argrest == 'f')
2591 queue_run_force = TRUE;
2592 if (*(++argrest) == 'f')
2594 deliver_force_thaw = TRUE;
2599 /* -q[f][f]l...: Run the queue only on local deliveries */
2601 if (*argrest == 'l')
2603 queue_run_local = TRUE;
2607 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2608 optionally starting from a given message id. */
2610 if (*argrest == 0 &&
2611 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2614 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2615 start_queue_run_id = argv[++i];
2616 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2617 stop_queue_run_id = argv[++i];
2620 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2621 optionally local only. */
2626 queue_interval = readconf_readtime(argrest, 0, FALSE);
2628 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2629 if (queue_interval <= 0)
2631 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2638 case 'R': /* Synonymous with -qR... */
2639 receiving_message = FALSE;
2641 /* -Rf: As -R (below) but force all deliveries,
2642 -Rff: Ditto, but also thaw all frozen messages,
2643 -Rr: String is regex
2644 -Rrf: Regex and force
2645 -Rrff: Regex and force and thaw
2647 in all cases provided there are no further characters in this
2653 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2655 if (Ustrcmp(argrest, rsopts[i]) == 0)
2657 if (i != 2) queue_run_force = TRUE;
2658 if (i >= 2) deliver_selectstring_regex = TRUE;
2659 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2660 argrest += Ustrlen(rsopts[i]);
2665 /* -R: Set string to match in addresses for forced queue run to
2666 pick out particular messages. */
2670 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2672 fprintf(stderr, "exim: string expected after -R\n");
2676 else deliver_selectstring = argrest;
2677 if (queue_interval < 0) queue_interval = 0;
2681 /* -r: an obsolete synonym for -f (see above) */
2684 /* -S: Like -R but works on sender. */
2686 case 'S': /* Synonymous with -qS... */
2687 receiving_message = FALSE;
2689 /* -Sf: As -S (below) but force all deliveries,
2690 -Sff: Ditto, but also thaw all frozen messages,
2691 -Sr: String is regex
2692 -Srf: Regex and force
2693 -Srff: Regex and force and thaw
2695 in all cases provided there are no further characters in this
2701 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2703 if (Ustrcmp(argrest, rsopts[i]) == 0)
2705 if (i != 2) queue_run_force = TRUE;
2706 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2707 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2708 argrest += Ustrlen(rsopts[i]);
2713 /* -S: Set string to match in addresses for forced queue run to
2714 pick out particular messages. */
2718 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2720 fprintf(stderr, "exim: string expected after -S\n");
2724 else deliver_selectstring_sender = argrest;
2725 if (queue_interval < 0) queue_interval = 0;
2728 /* -Tqt is an option that is exclusively for use by the testing suite.
2729 It is not recognized in other circumstances. It allows for the setting up
2730 of explicit "queue times" so that various warning/retry things can be
2731 tested. Otherwise variability of clock ticks etc. cause problems. */
2734 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2735 fudged_queue_times = argv[++i];
2740 /* -t: Set flag to extract recipients from body of message. */
2743 if (*argrest == 0) extract_recipients = TRUE;
2745 /* -ti: Set flag to extract recipients from body of message, and also
2746 specify that dot does not end the message. */
2748 else if (Ustrcmp(argrest, "i") == 0)
2750 extract_recipients = TRUE;
2754 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2757 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2764 /* -U: This means "initial user submission" in sendmail, apparently. The
2765 doc claims that in future sendmail may refuse syntactically invalid
2766 messages instead of fixing them. For the moment, we just ignore it. */
2772 /* -v: verify things - this is a very low-level debugging */
2777 debug_selector |= D_v;
2778 debug_file = stderr;
2784 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2786 The -x flag tells the sendmail command that mail from a local
2787 mail program has National Language Support (NLS) extended characters
2788 in the body of the mail item. The sendmail command can send mail with
2789 extended NLS characters across networks that normally corrupts these
2792 As Exim is 8-bit clean, it just ignores this flag. */
2795 if (*argrest != 0) badarg = TRUE;
2798 /* All other initial characters are errors */
2803 } /* End of high-level switch statement */
2805 /* Failed to recognize the option, or syntax error */
2809 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2810 "option %s\n", arg);
2816 /* Arguments have been processed. Check for incompatibilities. */
2820 (smtp_input || extract_recipients || recipients_arg < argc) &&
2821 (daemon_listen || queue_interval >= 0 || bi_option ||
2822 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2823 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2826 msg_action_arg > 0 &&
2827 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2828 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2831 (daemon_listen || queue_interval >= 0) &&
2832 (sender_address != NULL || list_options || list_queue || checking ||
2836 daemon_listen && queue_interval == 0
2840 (checking || smtp_input || extract_recipients ||
2841 filter_test != FTEST_NONE || bi_option)
2844 verify_address_mode &&
2845 (address_test_mode || smtp_input || extract_recipients ||
2846 filter_test != FTEST_NONE || bi_option)
2849 address_test_mode && (smtp_input || extract_recipients ||
2850 filter_test != FTEST_NONE || bi_option)
2853 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2857 deliver_selectstring != NULL && queue_interval < 0
2861 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2865 /* If debugging is set up, set the file and the file descriptor to pass on to
2866 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2867 to run in the foreground. */
2869 if (debug_selector != 0)
2871 debug_file = stderr;
2872 debug_fd = fileno(debug_file);
2873 background_daemon = FALSE;
2874 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2875 if (debug_selector != D_v) /* -v only doesn't show this */
2877 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2878 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2880 show_whats_supported(stderr);
2884 /* When started with root privilege, ensure that the limits on the number of
2885 open files and the number of processes (where that is accessible) are
2886 sufficiently large, or are unset, in case Exim has been called from an
2887 environment where the limits are screwed down. Not all OS have the ability to
2888 change some of these limits. */
2892 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2898 #ifdef RLIMIT_NOFILE
2899 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2901 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2903 rlp.rlim_cur = rlp.rlim_max = 0;
2906 /* I originally chose 1000 as a nice big number that was unlikely to
2907 be exceeded. It turns out that some older OS have a fixed upper limit of
2910 if (rlp.rlim_cur < 1000)
2912 rlp.rlim_cur = rlp.rlim_max = 1000;
2913 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2915 rlp.rlim_cur = rlp.rlim_max = 256;
2916 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2917 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2924 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2926 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2928 rlp.rlim_cur = rlp.rlim_max = 0;
2931 #ifdef RLIM_INFINITY
2932 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2934 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2936 if (rlp.rlim_cur < 1000)
2938 rlp.rlim_cur = rlp.rlim_max = 1000;
2940 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2941 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2947 /* Exim is normally entered as root (but some special configurations are
2948 possible that don't do this). However, it always spins off sub-processes that
2949 set their uid and gid as required for local delivery. We don't want to pass on
2950 any extra groups that root may belong to, so we want to get rid of them all at
2953 We need to obey setgroups() at this stage, before possibly giving up root
2954 privilege for a changed configuration file, but later on we might need to
2955 check on the additional groups for the admin user privilege - can't do that
2956 till after reading the config, which might specify the exim gid. Therefore,
2957 save the group list here first. */
2959 group_count = getgroups(NGROUPS_MAX, group_list);
2961 /* There is a fundamental difference in some BSD systems in the matter of
2962 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2963 known not to be different. On the "different" systems there is a single group
2964 list, and the first entry in it is the current group. On all other versions of
2965 Unix there is a supplementary group list, which is in *addition* to the current
2966 group. Consequently, to get rid of all extraneous groups on a "standard" system
2967 you pass over 0 groups to setgroups(), while on a "different" system you pass
2968 over a single group - the current group, which is always the first group in the
2969 list. Calling setgroups() with zero groups on a "different" system results in
2970 an error return. The following code should cope with both types of system.
2972 However, if this process isn't running as root, setgroups() can't be used
2973 since you have to be root to run it, even if throwing away groups. Not being
2974 root here happens only in some unusual configurations. We just ignore the
2977 if (setgroups(0, NULL) != 0)
2979 if (setgroups(1, group_list) != 0 && !unprivileged)
2981 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2986 /* If the configuration file name has been altered by an argument on the
2987 command line (either a new file name or a macro definition) and the caller is
2988 not root or the exim user, or if this is a filter testing run, remove any
2989 setuid privilege the program has, and run as the underlying user.
2991 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2992 severely restricts the use of -C for some purposes.
2994 Otherwise, set the real ids to the effective values (should be root unless run
2995 from inetd, which it can either be root or the exim uid, if one is configured).
2997 There is a private mechanism for bypassing some of this, in order to make it
2998 possible to test lots of configurations automatically, without having either to
2999 recompile each time, or to patch in an actual configuration file name and other
3000 values (such as the path name). If running in the test harness, pretend that
3001 configuration file changes and macro definitions haven't happened. */
3004 (config_changed || macros != NULL) && /* Config changed, and */
3005 real_uid != root_uid && /* Not root, and */
3006 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3007 real_uid != exim_uid && /* Not exim, and */
3009 !running_in_test_harness /* Not fudged */
3011 expansion_test /* expansion testing */
3013 filter_test != FTEST_NONE) /* Filter testing */
3015 setgroups(group_count, group_list);
3016 exim_setugid(real_uid, real_gid, FALSE,
3017 US"-C, -D, -be or -bf forces real uid");
3018 removed_privilege = TRUE;
3020 /* In the normal case when Exim is called like this, stderr is available
3021 and should be used for any logging information because attempts to write
3022 to the log will usually fail. To arrange this, we unset really_exim. However,
3023 if no stderr is available there is no point - we might as well have a go
3024 at the log (if it fails, syslog will be written). */
3026 if (log_stderr != NULL) really_exim = FALSE;
3029 /* Privilege is to be retained for the moment. It may be dropped later,
3030 depending on the job that this Exim process has been asked to do. For now, set
3031 the real uid to the effective so that subsequent re-execs of Exim are done by a
3034 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3036 /* If testing a filter, open the file(s) now, before wasting time doing other
3037 setups and reading the message. */
3039 if ((filter_test & FTEST_SYSTEM) != 0)
3041 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3044 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3046 return EXIT_FAILURE;
3050 if ((filter_test & FTEST_USER) != 0)
3052 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3055 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3057 return EXIT_FAILURE;
3061 /* Read the main runtime configuration data; this gives up if there
3062 is a failure. It leaves the configuration file open so that the subsequent
3063 configuration data for delivery can be read if needed. */
3067 /* Handle the decoding of logging options. */
3069 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3070 log_options, log_options_count, US"log");
3074 debug_printf("configuration file is %s\n", config_main_filename);
3075 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3076 log_extra_selector);
3079 /* If domain literals are not allowed, check the sender address that was
3080 supplied with -f. Ditto for a stripped trailing dot. */
3082 if (sender_address != NULL)
3084 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3086 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3087 "allowed\n", sender_address);
3088 return EXIT_FAILURE;
3090 if (f_end_dot && !strip_trailing_dot)
3092 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3093 "(trailing dot not allowed)\n", sender_address);
3094 return EXIT_FAILURE;
3098 /* Paranoia check of maximum lengths of certain strings. There is a check
3099 on the length of the log file path in log.c, which will come into effect
3100 if there are any calls to write the log earlier than this. However, if we
3101 get this far but the string is very long, it is better to stop now than to
3102 carry on and (e.g.) receive a message and then have to collapse. The call to
3103 log_write() from here will cause the ultimate panic collapse if the complete
3104 file name exceeds the buffer length. */
3106 if (Ustrlen(log_file_path) > 200)
3107 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3108 "log_file_path is longer than 200 chars: aborting");
3110 if (Ustrlen(pid_file_path) > 200)
3111 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3112 "pid_file_path is longer than 200 chars: aborting");
3114 if (Ustrlen(spool_directory) > 200)
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3116 "spool_directory is longer than 200 chars: aborting");
3118 /* Length check on the process name given to syslog for its TAG field,
3119 which is only permitted to be 32 characters or less. See RFC 3164. */
3121 if (Ustrlen(syslog_processname) > 32)
3122 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3123 "syslog_processname is longer than 32 chars: aborting");
3125 /* In some operating systems, the environment variable TMPDIR controls where
3126 temporary files are created; Exim doesn't use these (apart from when delivering
3127 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3128 If TMPDIR is found in the environment, reset it to the value defined in the
3129 TMPDIR macro, if this macro is defined. */
3134 for (p = USS environ; *p != NULL; p++)
3136 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3137 Ustrcmp(*p+7, TMPDIR) != 0)
3139 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3140 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3142 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3148 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3149 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3150 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3151 called by a user who has set the TZ variable. This then affects the timestamps
3152 in log files and in Received: headers, and any created Date: header lines. The
3153 required timezone is settable in the configuration file, so nothing can be done
3154 about this earlier - but hopefully nothing will normally be logged earlier than
3155 this. We have to make a new environment if TZ is wrong, but don't bother if
3156 timestamps_utc is set, because then all times are in UTC anyway. */
3158 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3160 timestamps_utc = TRUE;
3164 uschar *envtz = US getenv("TZ");
3165 if ((envtz == NULL && timezone_string != NULL) ||
3167 (timezone_string == NULL ||
3168 Ustrcmp(timezone_string, envtz) != 0)))
3170 uschar **p = USS environ;
3174 while (*p++ != NULL) count++;
3175 if (envtz == NULL) count++;
3176 newp = new = malloc(sizeof(uschar *) * (count + 1));
3177 for (p = USS environ; *p != NULL; p++)
3179 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3182 if (timezone_string != NULL)
3184 *newp = malloc(Ustrlen(timezone_string) + 4);
3185 sprintf(CS *newp++, "TZ=%s", timezone_string);
3190 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3191 tod_stamp(tod_log));
3195 /* Handle the case when we have removed the setuid privilege because of -C or
3196 -D. This means that the caller of Exim was not root, and, provided that
3197 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3200 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3201 were running as the exim user defined in the configuration file (different to
3202 the one in the binary). The sysadmin may expect this case to retain privilege
3203 because "the binary was called by the Exim user", but it hasn't, because of the
3204 order in which it handles this stuff. There are two possibilities:
3206 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3207 to do message deliveries. Thus, the fact that it is running as a
3208 non-privileged user is plausible, and might be wanted in some special
3209 configurations. However, really_exim will have been set false when
3210 privilege was dropped, to stop Exim trying to write to its normal log
3211 files. Therefore, re-enable normal log processing, assuming the sysadmin
3212 has set up the log directory correctly.
3214 (2) If deliver_drop_privilege is not set, the configuration won't work as
3215 apparently intended, and so we log a panic message. In order to retain
3216 root for -C or -D, the caller must either be root or the Exim user
3217 defined in the binary (when deliver_drop_ privilege is false).
3219 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3220 built-in exim user or one defined in the configuration. In either event,
3221 re-enable log processing, assuming the sysadmin knows what they are doing. */
3223 if (removed_privilege && (config_changed || macros != NULL) &&
3224 real_uid == exim_uid)
3226 #ifdef ALT_CONFIG_ROOT_ONLY
3227 really_exim = TRUE; /* let logging work normally */
3230 if (deliver_drop_privilege)
3231 really_exim = TRUE; /* let logging work normally */
3233 log_write(0, LOG_MAIN|LOG_PANIC,
3234 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3235 (int)exim_uid, config_changed? "-C" : "-D");
3239 /* Start up Perl interpreter if Perl support is configured and there is a
3240 perl_startup option, and the configuration or the command line specifies
3241 initializing starting. Note that the global variables are actually called
3242 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3245 if (perl_start_option != 0)
3246 opt_perl_at_start = (perl_start_option > 0);
3247 if (opt_perl_at_start && opt_perl_startup != NULL)
3250 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3251 errstr = init_perl(opt_perl_startup);
3254 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3255 return EXIT_FAILURE;
3257 opt_perl_started = TRUE;
3259 #endif /* EXIM_PERL */
3261 /* Log the arguments of the call if the configuration file said so. This is
3262 a debugging feature for finding out what arguments certain MUAs actually use.
3263 Don't attempt it if logging is disabled, or if listing variables or if
3264 verifying/testing addresses or expansions. */
3266 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3267 && really_exim && !list_options && !checking)
3270 uschar *p = big_buffer;
3272 (void)getcwd(CS p+4, big_buffer_size - 4);
3274 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3276 for (i = 0; i < argc; i++)
3278 int len = Ustrlen(argv[i]);
3281 if (p + len + 8 >= big_buffer + big_buffer_size)
3284 log_write(0, LOG_MAIN, "%s", big_buffer);
3285 Ustrcpy(big_buffer, "...");
3288 printing = string_printing(argv[i]);
3289 if (printing[0] == 0) quote = US"\""; else
3291 uschar *pp = printing;
3293 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3295 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3296 (p - big_buffer) - 4), printing, quote);
3300 if ((log_extra_selector & LX_arguments) != 0)
3301 log_write(0, LOG_MAIN, "%s", big_buffer);
3303 debug_printf("%s\n", big_buffer);
3306 /* Set the working directory to be the top-level spool directory. We don't rely
3307 on this in the code, which always uses fully qualified names, but it's useful
3308 for core dumps etc. Don't complain if it fails - the spool directory might not
3309 be generally accessible and calls with the -C option (and others) have lost
3310 privilege by now. Before the chdir, we try to ensure that the directory exists.
3313 if (Uchdir(spool_directory) != 0)
3315 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3316 (void)Uchdir(spool_directory);
3319 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3320 alias file. Exim doesn't have such a concept, but this call is screwed into
3321 Sun's YP makefiles. Handle this by calling a configured script, as the real
3322 user who called Exim. The -oA option can be used to pass an argument to the
3327 (void)fclose(config_file);
3328 if (bi_command != NULL)
3332 argv[i++] = bi_command;
3333 if (alias_arg != NULL) argv[i++] = alias_arg;
3336 setgroups(group_count, group_list);
3337 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3339 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3340 (argv[1] == NULL)? US"" : argv[1]);
3342 execv(CS argv[0], (char *const *)argv);
3343 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3348 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3353 /* If an action on specific messages is requested, or if a daemon or queue
3354 runner is being started, we need to know if Exim was called by an admin user.
3355 This is the case if the real user is root or exim, or if the real group is
3356 exim, or if one of the supplementary groups is exim or a group listed in
3357 admin_groups. We don't fail all message actions immediately if not admin_user,
3358 since some actions can be performed by non-admin users. Instead, set admin_user
3359 for later interrogation. */
3361 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3367 for (i = 0; i < group_count; i++)
3369 if (group_list[i] == exim_gid) admin_user = TRUE;
3370 else if (admin_groups != NULL)
3372 for (j = 1; j <= (int)(admin_groups[0]); j++)
3373 if (admin_groups[j] == group_list[i])
3374 { admin_user = TRUE; break; }
3376 if (admin_user) break;
3380 /* Another group of privileged users are the trusted users. These are root,
3381 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3382 are permitted to specify sender_addresses with -f on the command line, and
3383 other message parameters as well. */
3385 if (real_uid == root_uid || real_uid == exim_uid)
3386 trusted_caller = TRUE;
3391 if (trusted_users != NULL)
3393 for (i = 1; i <= (int)(trusted_users[0]); i++)
3394 if (trusted_users[i] == real_uid)
3395 { trusted_caller = TRUE; break; }
3398 if (!trusted_caller && trusted_groups != NULL)
3400 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3402 if (trusted_groups[i] == real_gid)
3403 trusted_caller = TRUE;
3404 else for (j = 0; j < group_count; j++)
3406 if (trusted_groups[i] == group_list[j])
3407 { trusted_caller = TRUE; break; }
3409 if (trusted_caller) break;
3414 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3415 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3417 /* Only an admin user may start the daemon or force a queue run in the default
3418 configuration, but the queue run restriction can be relaxed. Only an admin
3419 user may request that a message be returned to its sender forthwith. Only an
3420 admin user may specify a debug level greater than D_v (because it might show
3421 passwords, etc. in lookup queries). Only an admin user may request a queue
3426 BOOL debugset = (debug_selector & ~D_v) != 0;
3427 if (deliver_give_up || daemon_listen ||
3428 (count_queue && queue_list_requires_admin) ||
3429 (list_queue && queue_list_requires_admin) ||
3430 (queue_interval >= 0 && prod_requires_admin) ||
3431 (debugset && !running_in_test_harness))
3433 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3438 /* If the real user is not root or the exim uid, the argument for passing
3439 in an open TCP/IP connection for another message is not permitted, nor is
3440 running with the -N option for any delivery action, unless this call to exim is
3441 one that supplied an input message, or we are using a patched exim for
3442 regression testing. */
3444 if (real_uid != root_uid && real_uid != exim_uid &&
3445 (continue_hostname != NULL ||
3447 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3448 )) && !running_in_test_harness)
3450 fprintf(stderr, "exim: Permission denied\n");
3451 return EXIT_FAILURE;
3454 /* If the caller is not trusted, certain arguments are ignored when running for
3455 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3456 Note that authority for performing certain actions on messages is tested in the
3457 queue_action() function. */
3459 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3461 sender_host_name = sender_host_address = interface_address =
3462 sender_ident = received_protocol = NULL;
3463 sender_host_port = interface_port = 0;
3464 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3467 /* If a sender host address is set, extract the optional port number off the
3468 end of it and check its syntax. Do the same thing for the interface address.
3469 Exim exits if the syntax is bad. */
3473 if (sender_host_address != NULL)
3474 sender_host_port = check_port(sender_host_address);
3475 if (interface_address != NULL)
3476 interface_port = check_port(interface_address);
3479 /* If an SMTP message is being received check to see if the standard input is a
3480 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3481 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3486 union sockaddr_46 inetd_sock;
3487 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3488 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3490 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3491 if (family == AF_INET || family == AF_INET6)
3493 union sockaddr_46 interface_sock;
3494 size = sizeof(interface_sock);
3496 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3497 interface_address = host_ntoa(-1, &interface_sock, NULL,
3500 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3502 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3505 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3506 NULL, &sender_host_port);
3507 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3508 "inetd is not supported when mua_wrapper is set");
3513 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3514 return EXIT_FAILURE;
3520 /* If the load average is going to be needed while receiving a message, get it
3521 now for those OS that require the first call to os_getloadavg() to be done as
3522 root. There will be further calls later for each message received. */
3524 #ifdef LOAD_AVG_NEEDS_ROOT
3525 if (receiving_message &&
3526 (queue_only_load >= 0 ||
3527 (is_inetd && smtp_load_reserve >= 0)
3530 load_average = os_getloadavg();
3534 /* The queue_only configuration option can be overridden by -odx on the command
3535 line, except that if queue_only_override is false, queue_only cannot be unset
3536 from the command line. */
3538 if (queue_only_set && (queue_only_override || arg_queue_only))
3539 queue_only = arg_queue_only;
3541 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3544 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3545 if (arg_smtp_receive_timeout >= 0)
3546 smtp_receive_timeout = arg_smtp_receive_timeout;
3548 /* If Exim was started with root privilege, unless we have already removed the
3549 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3550 except when starting the daemon or doing some kind of delivery or address
3551 testing (-bt). These are the only cases when root need to be retained. We run
3552 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3553 retained only for starting the daemon. */
3555 if (!unprivileged && /* originally had root AND */
3556 !removed_privilege && /* still got root AND */
3557 !daemon_listen && /* not starting the daemon */
3558 queue_interval <= 0 && /* (either kind of daemon) */
3560 deliver_drop_privilege || /* requested unprivileged */
3562 queue_interval < 0 && /* not running the queue */
3563 (msg_action_arg < 0 || /* and */
3564 msg_action != MSG_DELIVER) && /* not delivering and */
3565 (!checking || !address_test_mode) /* not address checking */
3569 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3572 /* When we are retaining a privileged uid, we still change to the exim gid. */
3574 else setgid(exim_gid);
3576 /* Handle a request to list the delivery queue */
3580 set_process_info("listing the queue");
3581 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3585 /* Handle a request to count the delivery queue */
3589 set_process_info("counting the queue");
3594 /* Handle actions on specific messages, except for the force delivery action,
3595 which is done below. Some actions take a whole list of message ids, which
3596 are known to continue up to the end of the arguments. Others take a single
3597 message id and then operate on the recipients list. */
3599 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3601 int yield = EXIT_SUCCESS;
3602 set_process_info("acting on specified messages");
3604 if (!one_msg_action)
3606 for (i = msg_action_arg; i < argc; i++)
3607 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3608 yield = EXIT_FAILURE;
3611 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3612 recipients_arg)) yield = EXIT_FAILURE;
3616 /* All the modes below here require the remaining configuration sections
3617 to be read, except that we can skip over the ACL setting when delivering
3618 specific messages, or doing a queue run. (For various testing cases we could
3619 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3622 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3624 /* The configuration data will have been read into POOL_PERM because we won't
3625 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3626 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3627 configuration were read into POOL_MAIN, because we don't do any resets till
3628 later on. However, it seems right, and it does ensure that both pools get used.
3631 store_pool = POOL_MAIN;
3633 /* Handle the -brt option. This is for checking out retry configurations.
3634 The next three arguments are a domain name or a complete address, and
3635 optionally two error numbers. All it does is to call the function that
3636 scans the retry configuration data. */
3638 if (test_retry_arg >= 0)
3640 retry_config *yield;
3641 int basic_errno = 0;
3645 if (test_retry_arg >= argc)
3647 printf("-brt needs a domain or address argument\n");
3648 exim_exit(EXIT_FAILURE);
3650 s1 = argv[test_retry_arg++];
3653 /* If the first argument contains no @ and no . it might be a local user
3654 or it might be a single-component name. Treat as a domain. */
3656 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3658 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3659 "being \ntreated as a one-component domain, not as a local part.\n\n",
3663 /* There may be an optional second domain arg. */
3665 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3666 s2 = argv[test_retry_arg++];
3668 /* The final arg is an error name */
3670 if (test_retry_arg < argc)
3672 uschar *ss = argv[test_retry_arg];
3674 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3677 printf("%s\n", CS error);
3678 return EXIT_FAILURE;
3681 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3682 an error is for matching codes to the decade. Turn them into a real error
3683 code, off the decade. */
3685 if (basic_errno == ERRNO_RCPT4XX)
3687 int code = (more_errno >> 8) & 255;
3689 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3690 else if (code > 100)
3691 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3695 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3696 if (yield == NULL) printf("No retry information found\n"); else
3699 more_errno = yield->more_errno;
3700 printf("Retry rule: %s ", yield->pattern);
3702 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3704 printf("quota%s%s ",
3705 (more_errno > 0)? "_" : "",
3706 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3708 else if (yield->basic_errno == ECONNREFUSED)
3710 printf("refused%s%s ",
3711 (more_errno > 0)? "_" : "",
3712 (more_errno == 'M')? "MX" :
3713 (more_errno == 'A')? "A" : "");
3715 else if (yield->basic_errno == ETIMEDOUT)
3718 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3720 if (more_errno != 0) printf("_%s",
3721 (more_errno == 'M')? "MX" : "A");
3724 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3725 printf("auth_failed ");
3728 for (r = yield->rules; r != NULL; r = r->next)
3730 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3731 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3737 printf(",%d.", x/1000);
3751 exim_exit(EXIT_SUCCESS);
3754 /* Handle a request to list one or more configuration options */
3758 set_process_info("listing variables");
3759 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3760 else for (i = recipients_arg; i < argc; i++)
3763 (Ustrcmp(argv[i], "router") == 0 ||
3764 Ustrcmp(argv[i], "transport") == 0 ||
3765 Ustrcmp(argv[i], "authenticator") == 0))
3767 readconf_print(argv[i+1], argv[i]);
3770 else readconf_print(argv[i], NULL);
3772 exim_exit(EXIT_SUCCESS);
3776 /* Handle a request to deliver one or more messages that are already on the
3777 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3778 is typically used for a small number when prodding by hand (when the option
3779 forced_delivery will be set) or when re-execing to regain root privilege.
3780 Each message delivery must happen in a separate process, so we fork a process
3781 for each one, and run them sequentially so that debugging output doesn't get
3782 intertwined, and to avoid spawning too many processes if a long list is given.
3783 However, don't fork for the last one; this saves a process in the common case
3784 when Exim is called to deliver just one message. */
3786 if (msg_action_arg > 0)
3788 if (prod_requires_admin && !admin_user)
3790 fprintf(stderr, "exim: Permission denied\n");
3791 exim_exit(EXIT_FAILURE);
3793 set_process_info("delivering specified messages");
3794 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3795 for (i = msg_action_arg; i < argc; i++)
3800 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3801 else if ((pid = fork()) == 0)
3803 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3804 _exit(EXIT_SUCCESS);
3808 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3810 exim_exit(EXIT_FAILURE);
3814 exim_exit(EXIT_SUCCESS);
3818 /* If only a single queue run is requested, without SMTP listening, we can just
3819 turn into a queue runner, with an optional starting message id. */
3821 if (queue_interval == 0 && !daemon_listen)
3823 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3824 (start_queue_run_id == NULL)? US"" : US" starting at ",
3825 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3826 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3827 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3828 set_process_info("running the queue (single queue run)");
3829 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3830 exim_exit(EXIT_SUCCESS);
3834 /* Find the login name of the real user running this process. This is always
3835 needed when receiving a message, because it is written into the spool file. It
3836 may also be used to construct a from: or a sender: header, and in this case we
3837 need the user's full name as well, so save a copy of it, checked for RFC822
3838 syntax and munged if necessary, if it hasn't previously been set by the -F
3839 argument. We may try to get the passwd entry more than once, in case NIS or
3840 other delays are in evidence. Save the home directory for use in filter testing
3845 if ((pw = getpwuid(real_uid)) != NULL)
3847 originator_login = string_copy(US pw->pw_name);
3848 originator_home = string_copy(US pw->pw_dir);
3850 /* If user name has not been set by -F, set it from the passwd entry
3851 unless -f has been used to set the sender address by a trusted user. */
3853 if (originator_name == NULL)
3855 if (sender_address == NULL ||
3856 (!trusted_caller && filter_test == FTEST_NONE))
3858 uschar *name = US pw->pw_gecos;
3859 uschar *amp = Ustrchr(name, '&');
3862 /* Most Unix specify that a '&' character in the gecos field is
3863 replaced by a copy of the login name, and some even specify that
3864 the first character should be upper cased, so that's what we do. */
3869 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3870 amp - name, name, &loffset, originator_login, amp + 1);
3871 buffer[loffset] = toupper(buffer[loffset]);
3875 /* If a pattern for matching the gecos field was supplied, apply
3876 it and then expand the name string. */
3878 if (gecos_pattern != NULL && gecos_name != NULL)
3881 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3883 if (regex_match_and_setup(re, name, 0, -1))
3885 uschar *new_name = expand_string(gecos_name);
3887 if (new_name != NULL)
3889 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3890 "gecos field \"%s\"\n", new_name, name);
3893 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3894 "\"%s\": %s\n", gecos_name, expand_string_message);
3896 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3897 "gecos field \"%s\"\n", gecos_pattern, name);
3898 store_free((void *)re);
3900 originator_name = string_copy(name);
3903 /* A trusted caller has used -f but not -F */
3905 else originator_name = US"";
3908 /* Break the retry loop */
3913 if (++i > finduser_retries) break;
3917 /* If we cannot get a user login, log the incident and give up, unless the
3918 configuration specifies something to use. When running in the test harness,
3919 any setting of unknown_login overrides the actual name. */
3921 if (originator_login == NULL || running_in_test_harness)
3923 if (unknown_login != NULL)
3925 originator_login = expand_string(unknown_login);
3926 if (originator_name == NULL && unknown_username != NULL)
3927 originator_name = expand_string(unknown_username);
3928 if (originator_name == NULL) originator_name = US"";
3930 if (originator_login == NULL)
3931 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3935 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3938 originator_name = string_copy(parse_fix_phrase(originator_name,
3939 Ustrlen(originator_name), big_buffer, big_buffer_size));
3941 /* If a message is created by this call of Exim, the uid/gid of its originator
3942 are those of the caller. These values are overridden if an existing message is
3943 read in from the spool. */
3945 originator_uid = real_uid;
3946 originator_gid = real_gid;
3948 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3949 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3951 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3952 returns. We leave this till here so that the originator_ fields are available
3953 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3956 if (daemon_listen || queue_interval > 0)
3960 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3961 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3962 "mua_wrapper is set");
3967 /* If the sender ident has not been set (by a trusted caller) set it to
3968 the caller. This will get overwritten below for an inetd call. If a trusted
3969 caller has set it empty, unset it. */
3971 if (sender_ident == NULL) sender_ident = originator_login;
3972 else if (sender_ident[0] == 0) sender_ident = NULL;
3974 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3975 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3976 originator_* variables set. */
3978 if (test_rewrite_arg >= 0)
3980 really_exim = FALSE;
3981 if (test_rewrite_arg >= argc)
3983 printf("-brw needs an address argument\n");
3984 exim_exit(EXIT_FAILURE);
3986 rewrite_test(argv[test_rewrite_arg]);
3987 exim_exit(EXIT_SUCCESS);
3990 /* A locally-supplied message is considered to be coming from a local user
3991 unless a trusted caller supplies a sender address with -f, or is passing in the
3992 message via SMTP (inetd invocation or otherwise). */
3994 if ((sender_address == NULL && !smtp_input) ||
3995 (!trusted_caller && filter_test == FTEST_NONE))
3997 sender_local = TRUE;
3999 /* A trusted caller can supply authenticated_sender and authenticated_id
4000 via -oMas and -oMai and if so, they will already be set. */
4002 if (authenticated_sender == NULL)
4003 authenticated_sender = string_sprintf("%s@%s", originator_login,
4004 qualify_domain_sender);
4005 if (authenticated_id == NULL) authenticated_id = originator_login;
4008 /* Trusted callers are always permitted to specify the sender address.
4009 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4010 is specified is the empty address. However, if a trusted caller does not
4011 specify a sender address for SMTP input, we leave sender_address unset. This
4012 causes the MAIL commands to be honoured. */
4014 if ((!smtp_input && sender_address == NULL) ||
4015 !receive_check_set_sender(sender_address))
4017 /* Either the caller is not permitted to set a general sender, or this is
4018 non-SMTP input and the trusted caller has not set a sender. If there is no
4019 sender, or if a sender other than <> is set, override with the originator's
4020 login (which will get qualified below), except when checking things. */
4022 if (sender_address == NULL /* No sender_address set */
4024 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4025 !checking && /* Not running tests, AND */
4026 filter_test == FTEST_NONE)) /* Not testing a filter */
4028 sender_address = originator_login;
4029 sender_address_forced = FALSE;
4030 sender_address_domain = 0;
4034 /* Remember whether an untrusted caller set the sender address */
4036 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4038 /* Ensure that the sender address is fully qualified unless it is the empty
4039 address, which indicates an error message, or doesn't exist (root caller, smtp
4040 interface, no -f argument). */
4042 if (sender_address != NULL && sender_address[0] != 0 &&
4043 sender_address_domain == 0)
4044 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4045 qualify_domain_sender);
4047 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4049 /* Handle a request to verify a list of addresses, or test them for delivery.
4050 This must follow the setting of the sender address, since routers can be
4051 predicated upon the sender. If no arguments are given, read addresses from
4052 stdin. Set debug_level to at least D_v to get full output for address testing.
4055 if (verify_address_mode || address_test_mode)
4058 int flags = vopt_qualify;
4060 if (verify_address_mode)
4062 if (!verify_as_sender) flags |= vopt_is_recipient;
4063 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4068 flags |= vopt_is_recipient;
4069 debug_selector |= D_v;
4070 debug_file = stderr;
4071 debug_fd = fileno(debug_file);
4072 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4075 if (recipients_arg < argc)
4077 while (recipients_arg < argc)
4079 uschar *s = argv[recipients_arg++];
4082 BOOL finished = FALSE;
4083 uschar *ss = parse_find_address_end(s, FALSE);
4084 if (*ss == ',') *ss = 0; else finished = TRUE;
4085 test_address(s, flags, &exit_value);
4088 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4095 uschar *s = get_stdinput(NULL, NULL);
4096 if (s == NULL) break;
4097 test_address(s, flags, &exit_value);
4101 exim_exit(exit_value);
4104 /* Handle expansion checking */
4108 if (recipients_arg < argc)
4110 while (recipients_arg < argc)
4112 uschar *s = argv[recipients_arg++];
4113 uschar *ss = expand_string(s);
4115 printf ("Failed: %s\n", expand_string_message);
4116 else printf("%s\n", CS ss);
4124 char *(*fn_readline)(char *) = NULL;
4125 char *(*fn_addhist)(char *) = NULL;
4128 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4134 uschar *source = get_stdinput(fn_readline, fn_addhist);
4135 if (source == NULL) break;
4136 ss = expand_string(source);
4138 printf ("Failed: %s\n", expand_string_message);
4139 else printf("%s\n", CS ss);
4143 if (dlhandle != NULL) dlclose(dlhandle);
4147 exim_exit(EXIT_SUCCESS);
4151 /* The active host name is normally the primary host name, but it can be varied
4152 for hosts that want to play several parts at once. We need to ensure that it is
4153 set for host checking, and for receiving messages. */
4155 smtp_active_hostname = primary_hostname;
4156 if (raw_active_hostname != NULL)
4158 uschar *nah = expand_string(raw_active_hostname);
4161 if (!expand_string_forcedfail)
4162 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4163 "(smtp_active_hostname): %s", raw_active_hostname,
4164 expand_string_message);
4166 else if (nah[0] != 0) smtp_active_hostname = nah;
4169 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4170 given IP address so that the blocking and relay configuration can be tested. An
4171 RFC 1413 call is made only if we are running in the test harness and an
4172 incoming interface and both ports are specified, because there is no TCP/IP
4173 call to find the ident for. */
4180 sender_ident = NULL;
4181 if (running_in_test_harness && sender_host_port != 0 &&
4182 interface_address != NULL && interface_port != 0)
4183 verify_get_ident(1413);
4185 /* In case the given address is a non-canonical IPv6 address, canonicize
4186 it. The code works for both IPv4 and IPv6, as it happens. */
4188 size = host_aton(sender_host_address, x);
4189 sender_host_address = store_get(48); /* large enough for full IPv6 */
4190 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4192 /* Now set up for testing */
4194 host_build_sender_fullhost();
4198 sender_local = FALSE;
4199 sender_host_notsocket = TRUE;
4200 debug_file = stderr;
4201 debug_fd = fileno(debug_file);
4202 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4203 "**** but without any ident (RFC 1413) callback.\n"
4204 "**** This is not for real!\n\n",
4205 sender_host_address);
4207 if (verify_check_host(&hosts_connection_nolog) == OK)
4208 log_write_selector &= ~L_smtp_connection;
4209 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4211 if (smtp_start_session())
4213 reset_point = store_get(0);
4216 store_reset(reset_point);
4217 if (smtp_setup_msg() <= 0) break;
4218 if (!receive_msg(FALSE)) break;
4221 exim_exit(EXIT_SUCCESS);
4225 /* Arrange for message reception if recipients or SMTP were specified;
4226 otherwise complain unless a version print (-bV) happened or this is a filter
4227 verification test. In the former case, show the configuration file name. */
4229 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4231 if (version_printed)
4233 printf("Configuration file is %s\n", config_main_filename);
4234 return EXIT_SUCCESS;
4236 if (filter_test == FTEST_NONE)
4239 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4240 "not directly from a shell command line. Options and/or arguments control\n"
4241 "what it does when called. For a list of options, see the Exim documentation.\n");
4242 return EXIT_FAILURE;
4247 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4248 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4249 that we are not called from inetd, because that is rejected above. The
4250 following configuration settings are forced here:
4252 (1) Synchronous delivery (-odi)
4253 (2) Errors to stderr (-oep == -oeq)
4254 (3) No parallel remote delivery
4255 (4) Unprivileged delivery
4257 We don't force overall queueing options because there are several of them;
4258 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4259 to override any SMTP queueing. */
4263 synchronous_delivery = TRUE;
4264 arg_error_handling = ERRORS_STDERR;
4265 remote_max_parallel = 1;
4266 deliver_drop_privilege = TRUE;
4268 queue_smtp_domains = NULL;
4272 /* Prepare to accept one or more new messages on the standard input. When a
4273 message has been read, its id is returned in message_id[]. If doing immediate
4274 delivery, we fork a delivery process for each received message, except for the
4275 last one, where we can save a process switch.
4277 It is only in non-smtp mode that error_handling is allowed to be changed from
4278 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4279 sendmail error modes other than -oem ever actually used? Later: yes.) */
4281 if (!smtp_input) error_handling = arg_error_handling;
4283 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4284 logging being sent down the socket and make an identd call to get the
4289 (void)fclose(stderr);
4290 exim_nullstd(); /* Re-open to /dev/null */
4291 verify_get_ident(IDENT_PORT);
4292 host_build_sender_fullhost();
4293 set_process_info("handling incoming connection from %s via inetd",
4297 /* If the sender host address has been set, build sender_fullhost if it hasn't
4298 already been done (which it will have been for inetd). This caters for the
4299 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4300 so that the test for IP options is skipped for -bs input. */
4302 if (sender_host_address != NULL && sender_fullhost == NULL)
4304 host_build_sender_fullhost();
4305 set_process_info("handling incoming connection from %s via -oMa",
4307 sender_host_notsocket = TRUE;
4310 /* Otherwise, set the sender host as unknown except for inetd calls. This
4311 prevents host checking in the case of -bs not from inetd and also for -bS. */
4313 else if (!is_inetd) sender_host_unknown = TRUE;
4315 /* If stdout does not exist, then dup stdin to stdout. This can happen
4316 if exim is started from inetd. In this case fd 0 will be set to the socket,
4317 but fd 1 will not be set. This also happens for passed SMTP channels. */
4319 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4321 /* Set up the incoming protocol name and the state of the program. Root
4322 is allowed to force received protocol via the -oMr option above, and if we are
4323 in a non-local SMTP state it means we have come via inetd and the process info
4324 has already been set up. We don't set received_protocol here for smtp input,
4325 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4329 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4334 if (received_protocol == NULL)
4335 received_protocol = string_sprintf("local%s", called_as);
4336 set_process_info("accepting a local non-SMTP message from <%s>",
4340 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4344 local_queue_only = queue_only;
4346 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4347 the spool if so configured. On failure, we must not attempt to send an error
4348 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4349 error code is given.) */
4351 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4353 fprintf(stderr, "exim: insufficient disk space\n");
4354 return EXIT_FAILURE;
4357 /* If this is smtp input of any kind, handle the start of the SMTP
4364 if (verify_check_host(&hosts_connection_nolog) == OK)
4365 log_write_selector &= ~L_smtp_connection;
4366 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4367 if (!smtp_start_session())
4370 exim_exit(EXIT_SUCCESS);
4374 /* Otherwise, set up the input size limit here */
4378 thismessage_size_limit = expand_string_integer(message_size_limit);
4379 if (thismessage_size_limit < 0)
4381 if (thismessage_size_limit == -1)
4382 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4383 "message_size_limit: %s", expand_string_message);
4385 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4386 "message_size_limit: %s", expand_string_message);
4390 /* Loop for several messages when reading SMTP input. If we fork any child
4391 processes, we don't want to wait for them unless synchronous delivery is
4392 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4393 same as SIG_DFL, despite the fact that documentation often lists the default as
4394 "ignore". This is a confusing area. This is what I know:
4396 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4397 processes that complete simply to go away without ever becoming defunct. You
4398 can't then wait for them - but we don't want to wait for them in the
4399 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4400 happen for all OS (e.g. *BSD is different).
4402 But that's not the end of the story. Some (many? all?) systems have the
4403 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4404 has by default, so it seems that the difference is merely one of default
4405 (compare restarting vs non-restarting signals).
4407 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4408 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4409 of the loop below. Paranoia rules.
4411 February 2003: That's *still* not the end of the story. There are now versions
4412 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4413 process then calls waitpid(), a grumble is written to the system log, because
4414 this is logically inconsistent. In other words, it doesn't like the paranoia.
4415 As a consequenc of this, the waitpid() below is now excluded if we are sure
4416 that SIG_IGN works. */
4418 if (!synchronous_delivery)
4421 struct sigaction act;
4422 act.sa_handler = SIG_IGN;
4423 sigemptyset(&(act.sa_mask));
4424 act.sa_flags = SA_NOCLDWAIT;
4425 sigaction(SIGCHLD, &act, NULL);
4427 signal(SIGCHLD, SIG_IGN);
4431 /* Save the current store pool point, for resetting at the start of
4432 each message, and save the real sender address, if any. */
4434 reset_point = store_get(0);
4435 real_sender_address = sender_address;
4437 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4438 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4443 store_reset(reset_point);
4446 /* In the SMTP case, we have to handle the initial SMTP input and build the
4447 recipients list, before calling receive_msg() to read the message proper.
4448 Whatever sender address is actually given in the SMTP transaction is
4449 actually ignored for local senders - we use the actual sender, which is
4450 normally either the underlying user running this process or a -f argument
4451 provided by a trusted caller. It is saved in real_sender_address.
4453 However, if this value is NULL, we are dealing with a trusted caller when
4454 -f was not used; in this case, the SMTP sender is allowed to stand.
4456 Also, if untrusted_set_sender is set, we permit sender addresses that match
4457 anything in its list.
4459 The variable raw_sender_address holds the sender address before rewriting. */
4464 if ((rc = smtp_setup_msg()) > 0)
4466 if (real_sender_address != NULL &&
4467 !receive_check_set_sender(sender_address))
4469 sender_address = raw_sender = real_sender_address;
4470 sender_address_unrewritten = NULL;
4472 more = receive_msg(extract_recipients);
4473 if (message_id[0] == 0)
4476 exim_exit(EXIT_FAILURE);
4479 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4482 /* In the non-SMTP case, we have all the information from the command
4483 line, but must process it in case it is in the more general RFC822
4484 format, and in any case, to detect syntax errors. Also, it appears that
4485 the use of comma-separated lists as single arguments is common, so we
4486 had better support them. */
4492 int count = argc - recipients_arg;
4493 uschar **list = argv + recipients_arg;
4495 /* These options cannot be changed dynamically for non-SMTP messages */
4497 active_local_sender_retain = local_sender_retain;
4498 active_local_from_check = local_from_check;
4500 /* Save before any rewriting */
4502 raw_sender = string_copy(sender_address);
4504 /* Loop for each argument */
4506 for (i = 0; i < count; i++)
4508 int start, end, domain;
4510 uschar *s = list[i];
4512 /* Loop for each comma-separated address */
4516 BOOL finished = FALSE;
4518 uschar *ss = parse_find_address_end(s, FALSE);
4520 if (*ss == ',') *ss = 0; else finished = TRUE;
4522 /* Check max recipients - if -t was used, these aren't recipients */
4524 if (recipients_max > 0 && ++rcount > recipients_max &&
4525 !extract_recipients)
4527 if (error_handling == ERRORS_STDERR)
4529 fprintf(stderr, "exim: too many recipients\n");
4530 exim_exit(EXIT_FAILURE);
4535 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4536 errors_sender_rc : EXIT_FAILURE;
4541 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4543 if (domain == 0 && !allow_unqualified_recipient)
4546 errmess = US"unqualified recipient address not allowed";
4549 if (recipient == NULL)
4551 if (error_handling == ERRORS_STDERR)
4553 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4554 string_printing(list[i]), errmess);
4555 exim_exit(EXIT_FAILURE);
4561 eblock.text1 = string_printing(list[i]);
4562 eblock.text2 = errmess;
4564 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4565 errors_sender_rc : EXIT_FAILURE;
4569 receive_add_recipient(recipient, -1);
4572 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4576 /* Show the recipients when debugging */
4581 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4582 if (recipients_list != NULL)
4584 debug_printf("Recipients:\n");
4585 for (i = 0; i < recipients_count; i++)
4586 debug_printf(" %s\n", recipients_list[i].address);
4590 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4591 will just read the headers for the message, and not write anything onto the
4594 message_ended = END_NOTENDED;
4595 more = receive_msg(extract_recipients);
4597 /* more is always FALSE here (not SMTP message) when reading a message
4598 for real; when reading the headers of a message for filter testing,
4599 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4601 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4602 } /* Non-SMTP message reception */
4604 /* If this is a filter testing run, there are headers in store, but
4605 no message on the spool. Run the filtering code in testing mode, setting
4606 the domain to the qualify domain and the local part to the current user,
4607 unless they have been set by options. The prefix and suffix are left unset
4608 unless specified. The the return path is set to to the sender unless it has
4609 already been set from a return-path header in the message. */
4611 if (filter_test != FTEST_NONE)
4613 deliver_domain = (ftest_domain != NULL)?
4614 ftest_domain : qualify_domain_recipient;
4615 deliver_domain_orig = deliver_domain;
4616 deliver_localpart = (ftest_localpart != NULL)?
4617 ftest_localpart : originator_login;
4618 deliver_localpart_orig = deliver_localpart;
4619 deliver_localpart_prefix = ftest_prefix;
4620 deliver_localpart_suffix = ftest_suffix;
4621 deliver_home = originator_home;
4623 if (return_path == NULL)
4625 printf("Return-path copied from sender\n");
4626 return_path = string_copy(sender_address);
4630 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4632 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4634 receive_add_recipient(
4635 string_sprintf("%s%s%s@%s",
4636 (ftest_prefix == NULL)? US"" : ftest_prefix,
4638 (ftest_suffix == NULL)? US"" : ftest_suffix,
4639 deliver_domain), -1);
4641 printf("Recipient = %s\n", recipients_list[0].address);
4642 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4643 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4645 (void)chdir("/"); /* Get away from wherever the user is running this from */
4647 /* Now we run either a system filter test, or a user filter test, or both.
4648 In the latter case, headers added by the system filter will persist and be
4649 available to the user filter. We need to copy the filter variables
4652 if ((filter_test & FTEST_SYSTEM) != 0)
4654 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4655 exim_exit(EXIT_FAILURE);
4658 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4660 if ((filter_test & FTEST_USER) != 0)
4662 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4663 exim_exit(EXIT_FAILURE);
4666 exim_exit(EXIT_SUCCESS);
4669 /* Else act on the result of message reception. We should not get here unless
4670 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4671 TRUE. If it is not, check on the number of messages received in this
4672 connection. If that's OK and queue_only_load is set, check that the load
4673 average is below it. If it is not, set local_queue_only TRUE. Note that it
4674 then remains this way for any subsequent messages on the same SMTP connection.
4675 This is a deliberate choice; even though the load average may fall, it
4676 doesn't seem right to deliver later messages on the same call when not
4677 delivering earlier ones. */
4679 if (!local_queue_only)
4681 if (smtp_accept_queue_per_connection > 0 &&
4682 receive_messagecount > smtp_accept_queue_per_connection)
4684 local_queue_only = TRUE;
4685 queue_only_reason = 2;
4687 else if (queue_only_load >= 0)
4689 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4690 if (local_queue_only) queue_only_reason = 3;
4694 /* If running as an MUA wrapper, all queueing options and freezing options
4698 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4700 /* Log the queueing here, when it will get a message id attached, but
4701 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4704 if (local_queue_only) switch(queue_only_reason)
4707 log_write(L_delay_delivery,
4708 LOG_MAIN, "no immediate delivery: more than %d messages "
4709 "received in one connection", smtp_accept_queue_per_connection);
4713 log_write(L_delay_delivery,
4714 LOG_MAIN, "no immediate delivery: load average %.2f",
4715 (double)load_average/1000.0);
4719 /* Else do the delivery unless the ACL or local_scan() called for queue only
4720 or froze the message. Always deliver in a separate process. A fork failure is
4721 not a disaster, as the delivery will eventually happen on a subsequent queue
4722 run. The search cache must be tidied before the fork, as the parent will
4723 do it before exiting. The child will trigger a lookup failure and
4724 thereby defer the delivery if it tries to use (for example) a cached ldap
4725 connection that the parent has called unbind on. */
4727 else if (!queue_only_policy && !deliver_freeze)
4732 if ((pid = fork()) == 0)
4735 close_unwanted(); /* Close unwanted file descriptors and TLS */
4736 exim_nullstd(); /* Ensure std{in,out,err} exist */
4738 /* Occasionally in the test harness we don't have synchronous delivery
4739 set (can happen with bounces). In that case, let the old process finish
4740 before continuing, to keep the debug output the same. */
4742 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4744 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4745 mode, deliver_drop_privilege is forced TRUE). */
4747 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4749 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4751 /* Control does not return here. */
4754 /* No need to re-exec */
4756 rc = deliver_message(message_id, FALSE, FALSE);
4758 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4759 EXIT_SUCCESS : EXIT_FAILURE);
4764 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4765 "process: %s", strerror(errno));
4768 /* In the parent, wait if synchronous delivery is required. This will
4769 always be the case in MUA wrapper mode. */
4771 else if (synchronous_delivery)
4774 while (wait(&status) != pid);
4775 if ((status & 0x00ff) != 0)
4776 log_write(0, LOG_MAIN|LOG_PANIC,
4777 "process %d crashed with signal %d while delivering %s",
4778 (int)pid, status & 0x00ff, message_id);
4779 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4783 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4784 automatically reaps children (see comments above the loop), clear away any
4785 finished subprocesses here, in case there are lots of messages coming in
4786 from the same source. */
4788 #ifndef SIG_IGN_WORKS
4789 while (waitpid(-1, NULL, WNOHANG) > 0);
4793 exim_exit(EXIT_SUCCESS); /* Never returns */
4794 return 0; /* To stop compiler warning */