1 /* $Cambridge: exim/src/src/exim.c,v 1.24 2005/08/09 13:31:52 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:");
837 fprintf(f, " iconv()");
849 fprintf(f, " Expand_dlfunc");
851 #ifdef USE_TCP_WRAPPERS
852 fprintf(f, " TCPwrappers");
856 fprintf(f, " GnuTLS");
858 fprintf(f, " OpenSSL");
861 #ifdef WITH_CONTENT_SCAN
862 fprintf(f, " Content_Scanning");
864 #ifdef WITH_OLD_DEMIME
865 fprintf(f, " Old_Demime");
867 #ifdef EXPERIMENTAL_SPF
868 fprintf(f, " Experimental_SPF");
870 #ifdef EXPERIMENTAL_SRS
871 fprintf(f, " Experimental_SRS");
873 #ifdef EXPERIMENTAL_BRIGHTMAIL
874 fprintf(f, " Experimental_Brightmail");
876 #ifdef EXPERIMENTAL_DOMAINKEYS
877 fprintf(f, " Experimental_DomainKeys");
881 fprintf(f, "Lookups:");
882 #ifdef LOOKUP_LSEARCH
883 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
889 fprintf(f, " dbm dbmnz");
892 fprintf(f, " dnsdb");
894 #ifdef LOOKUP_DSEARCH
895 fprintf(f, " dsearch");
898 fprintf(f, " ibase");
901 fprintf(f, " ldap ldapdn ldapm");
904 fprintf(f, " mysql");
907 fprintf(f, " nis nis0");
909 #ifdef LOOKUP_NISPLUS
910 fprintf(f, " nisplus");
913 fprintf(f, " oracle");
916 fprintf(f, " passwd");
919 fprintf(f, " pgsql");
922 fprintf(f, " sqlite");
925 fprintf(f, " testdb");
928 fprintf(f, " whoson");
932 fprintf(f, "Authenticators:");
934 fprintf(f, " cram_md5");
936 #ifdef AUTH_CYRUS_SASL
937 fprintf(f, " cyrus_sasl");
939 #ifdef AUTH_PLAINTEXT
940 fprintf(f, " plaintext");
947 fprintf(f, "Routers:");
949 fprintf(f, " accept");
951 #ifdef ROUTER_DNSLOOKUP
952 fprintf(f, " dnslookup");
954 #ifdef ROUTER_IPLITERAL
955 fprintf(f, " ipliteral");
957 #ifdef ROUTER_IPLOOKUP
958 fprintf(f, " iplookup");
960 #ifdef ROUTER_MANUALROUTE
961 fprintf(f, " manualroute");
963 #ifdef ROUTER_QUERYPROGRAM
964 fprintf(f, " queryprogram");
966 #ifdef ROUTER_REDIRECT
967 fprintf(f, " redirect");
971 fprintf(f, "Transports:");
972 #ifdef TRANSPORT_APPENDFILE
973 fprintf(f, " appendfile");
974 #ifdef SUPPORT_MAILDIR
975 fprintf(f, "/maildir");
977 #ifdef SUPPORT_MAILSTORE
978 fprintf(f, "/mailstore");
984 #ifdef TRANSPORT_AUTOREPLY
985 fprintf(f, " autoreply");
987 #ifdef TRANSPORT_LMTP
990 #ifdef TRANSPORT_PIPE
993 #ifdef TRANSPORT_SMTP
998 if (fixed_never_users[0] > 0)
1001 fprintf(f, "Fixed never_users: ");
1002 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1003 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1004 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1011 /*************************************************
1012 * Quote a local part *
1013 *************************************************/
1015 /* This function is used when a sender address or a From: or Sender: header
1016 line is being created from the caller's login, or from an authenticated_id. It
1017 applies appropriate quoting rules for a local part.
1019 Argument: the local part
1020 Returns: the local part, quoted if necessary
1024 local_part_quote(uschar *lpart)
1026 BOOL needs_quote = FALSE;
1031 for (t = lpart; !needs_quote && *t != 0; t++)
1033 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1034 (*t != '.' || t == lpart || t[1] == 0);
1037 if (!needs_quote) return lpart;
1040 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1044 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1047 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1050 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1051 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1052 yield = string_cat(yield, &size, &ptr, nq, 1);
1056 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1064 /*************************************************
1065 * Load readline() functions *
1066 *************************************************/
1068 /* This function is called from testing executions that read data from stdin,
1069 but only when running as the calling user. Currently, only -be does this. The
1070 function loads the readline() function library and passes back the functions.
1071 On some systems, it needs the curses library, so load that too, but try without
1072 it if loading fails. All this functionality has to be requested at build time.
1075 fn_readline_ptr pointer to where to put the readline pointer
1076 fn_addhist_ptr pointer to where to put the addhistory function
1078 Returns: the dlopen handle or NULL on failure
1082 set_readline(char * (**fn_readline_ptr)(char *),
1083 char * (**fn_addhist_ptr)(char *))
1086 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1088 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1089 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1091 if (dlhandle != NULL)
1093 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1094 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1098 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1107 /*************************************************
1108 * Get a line from stdin for testing things *
1109 *************************************************/
1111 /* This function is called when running tests that can take a number of lines
1112 of input (for example, -be and -bt). It handles continuations and trailing
1113 spaces. And prompting and a blank line output on eof. If readline() is in use,
1114 the arguments are non-NULL and provide the relevant functions.
1117 fn_readline readline function or NULL
1118 fn_addhist addhist function or NULL
1120 Returns: pointer to dynamic memory, or NULL at end of file
1124 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1129 uschar *yield = NULL;
1131 if (fn_readline == NULL) printf("> ");
1135 uschar buffer[1024];
1139 char *readline_line = NULL;
1140 if (fn_readline != NULL)
1142 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1143 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1144 p = US readline_line;
1149 /* readline() not in use */
1152 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1156 /* Handle the line */
1158 ss = p + (int)Ustrlen(p);
1159 while (ss > p && isspace(ss[-1])) ss--;
1163 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1166 yield = string_cat(yield, &size, &ptr, p, ss - p);
1169 if (fn_readline != NULL) free(readline_line);
1172 if (ss == p || yield[ptr-1] != '\\')
1180 if (yield == NULL) printf("\n");
1186 /*************************************************
1187 * Entry point and high-level code *
1188 *************************************************/
1190 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1191 the appropriate action. All the necessary functions are present in the one
1192 binary. I originally thought one should split it up, but it turns out that so
1193 much of the apparatus is needed in each chunk that one might as well just have
1194 it all available all the time, which then makes the coding easier as well.
1197 argc count of entries in argv
1198 argv argument strings, with argv[0] being the program name
1200 Returns: EXIT_SUCCESS if terminated successfully
1201 EXIT_FAILURE otherwise, except when a message has been sent
1202 to the sender, and -oee was given
1206 main(int argc, char **cargv)
1208 uschar **argv = USS cargv;
1209 int arg_receive_timeout = -1;
1210 int arg_smtp_receive_timeout = -1;
1211 int arg_error_handling = error_handling;
1212 int filter_sfd = -1;
1213 int filter_ufd = -1;
1216 int list_queue_option = 0;
1218 int msg_action_arg = -1;
1219 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1220 int queue_only_reason = 0;
1222 int perl_start_option = 0;
1224 int recipients_arg = argc;
1225 int sender_address_domain = 0;
1226 int test_retry_arg = -1;
1227 int test_rewrite_arg = -1;
1228 BOOL arg_queue_only = FALSE;
1229 BOOL bi_option = FALSE;
1230 BOOL checking = FALSE;
1231 BOOL count_queue = FALSE;
1232 BOOL expansion_test = FALSE;
1233 BOOL extract_recipients = FALSE;
1234 BOOL forced_delivery = FALSE;
1235 BOOL f_end_dot = FALSE;
1236 BOOL deliver_give_up = FALSE;
1237 BOOL list_queue = FALSE;
1238 BOOL list_options = FALSE;
1239 BOOL local_queue_only;
1241 BOOL one_msg_action = FALSE;
1242 BOOL queue_only_set = FALSE;
1243 BOOL receiving_message = TRUE;
1245 BOOL removed_privilege = FALSE;
1246 BOOL verify_address_mode = FALSE;
1247 BOOL verify_as_sender = FALSE;
1248 BOOL version_printed = FALSE;
1249 uschar *alias_arg = NULL;
1250 uschar *called_as = US"";
1251 uschar *start_queue_run_id = NULL;
1252 uschar *stop_queue_run_id = NULL;
1253 uschar *ftest_domain = NULL;
1254 uschar *ftest_localpart = NULL;
1255 uschar *ftest_prefix = NULL;
1256 uschar *ftest_suffix = NULL;
1257 uschar *real_sender_address;
1258 uschar *originator_home = US"/";
1262 struct stat statbuf;
1263 pid_t passed_qr_pid = (pid_t)0;
1264 int passed_qr_pipe = -1;
1265 gid_t group_list[NGROUPS_MAX];
1267 /* Possible options for -R and -S */
1269 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1271 /* Need to define this in case we need to change the environment in order
1272 to get rid of a bogus time zone. We have to make it char rather than uschar
1273 because some OS define it in /usr/include/unistd.h. */
1275 extern char **environ;
1277 /* If the Exim user and/or group and/or the configuration file owner/group were
1278 defined by ref:name at build time, we must now find the actual uid/gid values.
1279 This is a feature to make the lives of binary distributors easier. */
1281 #ifdef EXIM_USERNAME
1282 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1284 exim_gid = pw->pw_gid;
1288 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1294 #ifdef EXIM_GROUPNAME
1295 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1297 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1303 #ifdef CONFIGURE_OWNERNAME
1304 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1306 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1307 CONFIGURE_OWNERNAME);
1312 #ifdef CONFIGURE_GROUPNAME
1313 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1315 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1316 CONFIGURE_GROUPNAME);
1321 /* In the Cygwin environment, some initialization needs doing. It is fudged
1322 in by means of this macro. */
1328 /* Check a field which is patched when we are running Exim within its
1329 testing harness; do a fast initial check, and then the whole thing. */
1331 running_in_test_harness =
1332 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1334 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1335 at the start of a program; however, it seems that some environments do not
1336 follow this. A "strange" locale can affect the formatting of timestamps, so we
1339 setlocale(LC_ALL, "C");
1341 /* Set up the default handler for timing using alarm(). */
1343 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1345 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1346 because store_malloc writes a log entry on failure. */
1348 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1349 if (log_buffer == NULL)
1351 fprintf(stderr, "exim: failed to get store for log buffer\n");
1355 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1356 NULL when the daemon is run and the file is closed. We have to use this
1357 indirection, because some systems don't allow writing to the variable "stderr".
1360 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1362 /* Arrange for the PCRE regex library to use our store functions. Note that
1363 the normal calls are actually macros that add additional arguments for
1364 debugging purposes so we have to assign specially constructed functions here.
1365 The default is to use store in the stacking pool, but this is overridden in the
1366 regex_must_compile() function. */
1368 pcre_malloc = function_store_get;
1369 pcre_free = function_dummy_free;
1371 /* Ensure there is a big buffer for temporary use in several places. It is put
1372 in malloc store so that it can be freed for enlargement if necessary. */
1374 big_buffer = store_malloc(big_buffer_size);
1376 /* Set up the handler for the data request signal, and set the initial
1377 descriptive text. */
1379 set_process_info("initializing");
1380 os_restarting_signal(SIGUSR1, usr1_handler);
1382 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1383 in the daemon code. For the rest of Exim's uses, we ignore it. */
1385 signal(SIGHUP, SIG_IGN);
1387 /* We don't want to die on pipe errors as the code is written to handle
1388 the write error instead. */
1390 signal(SIGPIPE, SIG_IGN);
1392 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1393 set to SIG_IGN. This causes subprocesses that complete before the parent
1394 process waits for them not to hang around, so when Exim calls wait(), nothing
1395 is there. The wait() code has been made robust against this, but let's ensure
1396 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1397 ending status. We use sigaction rather than plain signal() on those OS where
1398 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1399 problem on AIX with this.) */
1403 struct sigaction act;
1404 act.sa_handler = SIG_DFL;
1405 sigemptyset(&(act.sa_mask));
1407 sigaction(SIGCHLD, &act, NULL);
1410 signal(SIGCHLD, SIG_DFL);
1413 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1418 /* Set up the version number. Set up the leading 'E' for the external form of
1419 message ids, set the pointer to the internal form, and initialize it to
1420 indicate no message being processed. */
1423 message_id_option[0] = '-';
1424 message_id_external = message_id_option + 1;
1425 message_id_external[0] = 'E';
1426 message_id = message_id_external + 1;
1429 /* Set the umask to zero so that any files that Exim creates are created
1430 with the modes that it specifies. */
1434 /* Precompile the regular expression for matching a message id. Keep this in
1435 step with the code that generates ids in the accept.c module. We need to do
1436 this here, because the -M options check their arguments for syntactic validity
1437 using mac_ismsgid, which uses this. */
1440 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1442 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1443 this seems to be a generally accepted convention, since one finds symbolic
1444 links called "mailq" in standard OS configurations. */
1446 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1447 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1450 receiving_message = FALSE;
1451 called_as = US"-mailq";
1454 /* If the program is called as "rmail" treat it as equivalent to
1455 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1456 i.e. preventing a single dot on a line from terminating the message, and
1457 returning with zero return code, even in cases of error (provided an error
1458 message has been sent). */
1460 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1461 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1464 called_as = US"-rmail";
1465 errors_sender_rc = EXIT_SUCCESS;
1468 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1469 this is a smail convention. */
1471 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1472 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1474 smtp_input = smtp_batched_input = TRUE;
1475 called_as = US"-rsmtp";
1478 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1479 this is a smail convention. */
1481 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1482 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1485 receiving_message = FALSE;
1486 called_as = US"-runq";
1489 /* If the program is called as "newaliases" treat it as equivalent to
1490 "exim -bi"; this is a sendmail convention. */
1492 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1493 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1496 receiving_message = FALSE;
1497 called_as = US"-newaliases";
1500 /* Save the original effective uid for a couple of uses later. It should
1501 normally be root, but in some esoteric environments it may not be. */
1503 original_euid = geteuid();
1505 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1506 to be the same as the real ones. This makes a difference only if Exim is setuid
1507 (or setgid) to something other than root, which could be the case in some
1508 special configurations. */
1510 real_uid = getuid();
1511 real_gid = getgid();
1513 if (real_uid == root_uid)
1519 /* If neither the original real uid nor the original euid was root, Exim is
1520 running in an unprivileged state. */
1522 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1524 /* If the first argument is --help, pretend there are no arguments. This will
1525 cause a brief message to be given. */
1527 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1529 /* Scan the program's arguments. Some can be dealt with right away; others are
1530 simply recorded for checking and handling afterwards. Do a high-level switch
1531 on the second character (the one after '-'), to save some effort. */
1533 for (i = 1; i < argc; i++)
1535 BOOL badarg = FALSE;
1536 uschar *arg = argv[i];
1540 /* An argument not starting with '-' is the start of a recipients list;
1541 break out of the options-scanning loop. */
1549 /* An option consistion of -- terminates the options */
1551 if (Ustrcmp(arg, "--") == 0)
1553 recipients_arg = i + 1;
1557 /* Handle flagged options */
1559 switchchar = arg[1];
1562 /* Make all -ex options synonymous with -oex arguments, since that
1563 is assumed by various callers. Also make -qR options synonymous with -R
1564 options, as that seems to be required as well. Allow for -qqR too, and
1565 the same for -S options. */
1567 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1568 Ustrncmp(arg+1, "qR", 2) == 0 ||
1569 Ustrncmp(arg+1, "qS", 2) == 0)
1571 switchchar = arg[2];
1574 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1576 switchchar = arg[3];
1578 queue_2stage = TRUE;
1581 /* Make -r synonymous with -f, since it is a documented alias */
1583 else if (arg[1] == 'r') switchchar = 'f';
1585 /* Make -ov synonymous with -v */
1587 else if (Ustrcmp(arg, "-ov") == 0)
1593 /* High-level switch on active initial letter */
1597 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1598 so has no need of it. */
1601 if (*argrest == 0) i++; /* Skip over the type */
1606 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1608 /* -bd: Run in daemon mode, awaiting SMTP connections.
1609 -bdf: Ditto, but in the foreground.
1612 if (*argrest == 'd')
1614 daemon_listen = TRUE;
1615 if (*(++argrest) == 'f') background_daemon = FALSE;
1616 else if (*argrest != 0) { badarg = TRUE; break; }
1619 /* -be: Run in expansion test mode */
1621 else if (*argrest == 'e')
1622 expansion_test = checking = TRUE;
1624 /* -bF: Run system filter test */
1626 else if (*argrest == 'F')
1628 filter_test |= FTEST_SYSTEM;
1629 if (*(++argrest) != 0) { badarg = TRUE; break; }
1630 if (++i < argc) filter_test_sfile = argv[i]; else
1632 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1637 /* -bf: Run user filter test
1638 -bfd: Set domain for filter testing
1639 -bfl: Set local part for filter testing
1640 -bfp: Set prefix for filter testing
1641 -bfs: Set suffix for filter testing
1644 else if (*argrest == 'f')
1646 if (*(++argrest) == 0)
1648 filter_test |= FTEST_USER;
1649 if (++i < argc) filter_test_ufile = argv[i]; else
1651 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1659 fprintf(stderr, "exim: string expected after %s\n", arg);
1662 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1663 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1664 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1665 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1666 else { badarg = TRUE; break; }
1670 /* -bh: Host checking - an IP address must follow. */
1672 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1674 if (++i >= argc) { badarg = TRUE; break; }
1675 sender_host_address = argv[i];
1676 host_checking = checking = log_testing_mode = TRUE;
1677 host_checking_callout = argrest[1] == 'c';
1680 /* -bi: This option is used by sendmail to initialize *the* alias file,
1681 though it has the -oA option to specify a different file. Exim has no
1682 concept of *the* alias file, but since Sun's YP make script calls
1683 sendmail this way, some support must be provided. */
1685 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1687 /* -bm: Accept and deliver message - the default option. Reinstate
1688 receiving_message, which got turned off for all -b options. */
1690 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1692 /* -bnq: For locally originating messages, do not qualify unqualified
1693 addresses. In the envelope, this causes errors; in header lines they
1696 else if (Ustrcmp(argrest, "nq") == 0)
1698 allow_unqualified_sender = FALSE;
1699 allow_unqualified_recipient = FALSE;
1702 /* -bpxx: List the contents of the mail queue, in various forms. If
1703 the option is -bpc, just a queue count is needed. Otherwise, if the
1704 first letter after p is r, then order is random. */
1706 else if (*argrest == 'p')
1708 if (*(++argrest) == 'c')
1711 if (*(++argrest) != 0) badarg = TRUE;
1715 if (*argrest == 'r')
1717 list_queue_option = 8;
1720 else list_queue_option = 0;
1724 /* -bp: List the contents of the mail queue, top-level only */
1726 if (*argrest == 0) {}
1728 /* -bpu: List the contents of the mail queue, top-level undelivered */
1730 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1732 /* -bpa: List the contents of the mail queue, including all delivered */
1734 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1736 /* Unknown after -bp[r] */
1746 /* -bP: List the configuration variables given as the address list.
1747 Force -v, so configuration errors get displayed. */
1749 else if (Ustrcmp(argrest, "P") == 0)
1751 list_options = TRUE;
1752 debug_selector |= D_v;
1753 debug_file = stderr;
1756 /* -brt: Test retry configuration lookup */
1758 else if (Ustrcmp(argrest, "rt") == 0)
1760 test_retry_arg = i + 1;
1764 /* -brw: Test rewrite configuration */
1766 else if (Ustrcmp(argrest, "rw") == 0)
1768 test_rewrite_arg = i + 1;
1772 /* -bS: Read SMTP commands on standard input, but produce no replies -
1773 all errors are reported by sending messages. */
1775 else if (Ustrcmp(argrest, "S") == 0)
1776 smtp_input = smtp_batched_input = receiving_message = TRUE;
1778 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1779 on standard output. */
1781 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1783 /* -bt: address testing mode */
1785 else if (Ustrcmp(argrest, "t") == 0)
1786 address_test_mode = checking = log_testing_mode = TRUE;
1788 /* -bv: verify addresses */
1790 else if (Ustrcmp(argrest, "v") == 0)
1791 verify_address_mode = checking = log_testing_mode = TRUE;
1793 /* -bvs: verify sender addresses */
1795 else if (Ustrcmp(argrest, "vs") == 0)
1797 verify_address_mode = checking = log_testing_mode = TRUE;
1798 verify_as_sender = TRUE;
1801 /* -bV: Print version string and support details */
1803 else if (Ustrcmp(argrest, "V") == 0)
1805 printf("Exim version %s #%s built %s\n", version_string,
1806 version_cnumber, version_date);
1807 printf("%s\n", CS version_copyright);
1808 version_printed = TRUE;
1809 show_whats_supported(stdout);
1816 /* -C: change configuration file list; ignore if it isn't really
1817 a change! Enforce a prefix check if required. */
1822 if(++i < argc) argrest = argv[i]; else
1823 { badarg = TRUE; break; }
1825 if (Ustrcmp(config_main_filelist, argrest) != 0)
1827 #ifdef ALT_CONFIG_PREFIX
1829 int len = Ustrlen(ALT_CONFIG_PREFIX);
1830 uschar *list = argrest;
1832 while((filename = string_nextinlist(&list, &sep, big_buffer,
1833 big_buffer_size)) != NULL)
1835 if ((Ustrlen(filename) < len ||
1836 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1837 Ustrstr(filename, "/../") != NULL) &&
1838 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1840 fprintf(stderr, "-C Permission denied\n");
1846 config_main_filelist = argrest;
1847 config_changed = TRUE;
1852 /* -D: set up a macro definition */
1855 #ifdef DISABLE_D_OPTION
1856 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1861 macro_item *mlast = NULL;
1864 uschar *s = argrest;
1866 while (isspace(*s)) s++;
1868 if (*s < 'A' || *s > 'Z')
1870 fprintf(stderr, "exim: macro name set by -D must start with "
1871 "an upper case letter\n");
1875 while (isalnum(*s) || *s == '_')
1877 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1881 if (ptr == 0) { badarg = TRUE; break; }
1882 while (isspace(*s)) s++;
1885 if (*s++ != '=') { badarg = TRUE; break; }
1886 while (isspace(*s)) s++;
1889 for (m = macros; m != NULL; m = m->next)
1891 if (Ustrcmp(m->name, name) == 0)
1893 fprintf(stderr, "exim: duplicated -D in command line\n");
1899 m = store_get(sizeof(macro_item) + Ustrlen(name));
1901 m->command_line = TRUE;
1902 if (mlast == NULL) macros = m; else mlast->next = m;
1903 Ustrcpy(m->name, name);
1904 m->replacement = string_copy(s);
1906 if (clmacro_count >= MAX_CLMACROS)
1908 fprintf(stderr, "exim: too many -D options on command line\n");
1911 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1917 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1918 The latter is now a no-op, retained for compatibility only. If -dd is used,
1919 debugging subprocesses of the daemon is disabled. */
1922 if (Ustrcmp(argrest, "ropcr") == 0)
1924 /* drop_cr = TRUE; */
1927 /* Use an intermediate variable so that we don't set debugging while
1928 decoding the debugging bits. */
1932 unsigned int selector = D_default;
1935 if (*argrest == 'd')
1937 debug_daemon = TRUE;
1941 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1942 debug_options_count, US"debug");
1943 debug_selector = selector;
1948 /* -E: This is a local error message. This option is not intended for
1949 external use at all, but is not restricted to trusted callers because it
1950 does no harm (just suppresses certain error messages) and if Exim is run
1951 not setuid root it won't always be trusted when it generates error
1952 messages using this option. If there is a message id following -E, point
1953 message_reference at it, for logging. */
1956 local_error_message = TRUE;
1957 if (mac_ismsgid(argrest)) message_reference = argrest;
1961 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1962 option, so it looks as if historically the -oex options are also callable
1963 without the leading -o. So we have to accept them. Before the switch,
1964 anything starting -oe has been converted to -e. Exim does not support all
1965 of the sendmail error options. */
1968 if (Ustrcmp(argrest, "e") == 0)
1970 arg_error_handling = ERRORS_SENDER;
1971 errors_sender_rc = EXIT_SUCCESS;
1973 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1974 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1975 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1976 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1981 /* -F: Set sender's full name, used instead of the gecos entry from
1982 the password file. Since users can usually alter their gecos entries,
1983 there's no security involved in using this instead. The data can follow
1984 the -F or be in the next argument. */
1989 if(++i < argc) argrest = argv[i]; else
1990 { badarg = TRUE; break; }
1992 originator_name = argrest;
1996 /* -f: Set sender's address - this value is only actually used if Exim is
1997 run by a trusted user, or if untrusted_set_sender is set and matches the
1998 address, except that the null address can always be set by any user. The
1999 test for this happens later, when the value given here is ignored when not
2000 permitted. For an untrusted user, the actual sender is still put in Sender:
2001 if it doesn't match the From: header (unless no_local_from_check is set).
2002 The data can follow the -f or be in the next argument. The -r switch is an
2003 obsolete form of -f but since there appear to be programs out there that
2004 use anything that sendmail has ever supported, better accept it - the
2005 synonymizing is done before the switch above.
2007 At this stage, we must allow domain literal addresses, because we don't
2008 know what the setting of allow_domain_literals is yet. Ditto for trailing
2009 dots and strip_trailing_dot. */
2017 if (i+1 < argc) argrest = argv[++i]; else
2018 { badarg = TRUE; break; }
2022 sender_address = string_sprintf(""); /* Ensure writeable memory */
2026 uschar *temp = argrest + Ustrlen(argrest) - 1;
2027 while (temp >= argrest && isspace(*temp)) temp--;
2028 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2029 allow_domain_literals = TRUE;
2030 strip_trailing_dot = TRUE;
2031 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2032 &sender_address_domain, TRUE);
2033 allow_domain_literals = FALSE;
2034 strip_trailing_dot = FALSE;
2035 if (sender_address == NULL)
2037 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2038 return EXIT_FAILURE;
2041 sender_address_forced = TRUE;
2045 /* This is some Sendmail thing which can be ignored */
2050 /* -h: Set the hop count for an incoming message. Exim does not currently
2051 support this; it always computes it by counting the Received: headers.
2052 To put it in will require a change to the spool header file format. */
2057 if(++i < argc) argrest = argv[i]; else
2058 { badarg = TRUE; break; }
2060 if (!isdigit(*argrest)) badarg = TRUE;
2064 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2065 not to be documented for sendmail but mailx (at least) uses it) */
2068 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2073 receiving_message = FALSE;
2075 /* -MC: continue delivery of another message via an existing open
2076 file descriptor. This option is used for an internal call by the
2077 smtp transport when there is a pending message waiting to go to an
2078 address to which it has got a connection. Five subsequent arguments are
2079 required: transport name, host name, IP address, sequence number, and
2080 message_id. Transports may decline to create new processes if the sequence
2081 number gets too big. The channel is stdin. This (-MC) must be the last
2082 argument. There's a subsequent check that the real-uid is privileged.
2084 If we are running in the test harness. delay for a bit, to let the process
2085 that set this one up complete. This makes for repeatability of the logging,
2088 if (Ustrcmp(argrest, "C") == 0)
2092 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2093 return EXIT_FAILURE;
2096 if (msg_action_arg >= 0)
2098 fprintf(stderr, "exim: incompatible arguments\n");
2099 return EXIT_FAILURE;
2102 continue_transport = argv[++i];
2103 continue_hostname = argv[++i];
2104 continue_host_address = argv[++i];
2105 continue_sequence = Uatoi(argv[++i]);
2106 msg_action = MSG_DELIVER;
2107 msg_action_arg = ++i;
2108 forced_delivery = TRUE;
2109 queue_run_pid = passed_qr_pid;
2110 queue_run_pipe = passed_qr_pipe;
2112 if (!mac_ismsgid(argv[i]))
2114 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2116 return EXIT_FAILURE;
2119 if (running_in_test_harness) millisleep(500);
2123 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2124 precedes -MC (see above). The flag indicates that the host to which
2125 Exim is connected has accepted an AUTH sequence. */
2127 else if (Ustrcmp(argrest, "CA") == 0)
2129 smtp_authenticated = TRUE;
2133 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2134 it preceded -MC (see above) */
2136 else if (Ustrcmp(argrest, "CP") == 0)
2138 smtp_use_pipelining = TRUE;
2142 /* -MCQ: pass on the pid of the queue-running process that started
2143 this chain of deliveries and the fd of its synchronizing pipe; this
2144 is useful only when it precedes -MC (see above) */
2146 else if (Ustrcmp(argrest, "CQ") == 0)
2148 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2150 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2155 /* -MCS: set the smtp_use_size flag; this is useful only when it
2156 precedes -MC (see above) */
2158 else if (Ustrcmp(argrest, "CS") == 0)
2160 smtp_use_size = TRUE;
2164 /* -MCT: set the tls_offered flag; this is useful only when it
2165 precedes -MC (see above). The flag indicates that the host to which
2166 Exim is connected has offered TLS support. */
2169 else if (Ustrcmp(argrest, "CT") == 0)
2176 /* -M[x]: various operations on the following list of message ids:
2177 -M deliver the messages, ignoring next retry times and thawing
2178 -Mc deliver the messages, checking next retry times, no thawing
2179 -Mf freeze the messages
2180 -Mg give up on the messages
2181 -Mt thaw the messages
2182 -Mrm remove the messages
2183 In the above cases, this must be the last option. There are also the
2184 following options which are followed by a single message id, and which
2185 act on that message. Some of them use the "recipient" addresses as well.
2186 -Mar add recipient(s)
2187 -Mmad mark all recipients delivered
2188 -Mmd mark recipients(s) delivered
2195 else if (*argrest == 0)
2197 msg_action = MSG_DELIVER;
2198 forced_delivery = deliver_force_thaw = TRUE;
2200 else if (Ustrcmp(argrest, "ar") == 0)
2202 msg_action = MSG_ADD_RECIPIENT;
2203 one_msg_action = TRUE;
2205 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2206 else if (Ustrcmp(argrest, "es") == 0)
2208 msg_action = MSG_EDIT_SENDER;
2209 one_msg_action = TRUE;
2211 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2212 else if (Ustrcmp(argrest, "g") == 0)
2214 msg_action = MSG_DELIVER;
2215 deliver_give_up = TRUE;
2217 else if (Ustrcmp(argrest, "mad") == 0)
2219 msg_action = MSG_MARK_ALL_DELIVERED;
2221 else if (Ustrcmp(argrest, "md") == 0)
2223 msg_action = MSG_MARK_DELIVERED;
2224 one_msg_action = TRUE;
2226 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2227 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2228 else if (Ustrcmp(argrest, "vb") == 0)
2230 msg_action = MSG_SHOW_BODY;
2231 one_msg_action = TRUE;
2233 else if (Ustrcmp(argrest, "vh") == 0)
2235 msg_action = MSG_SHOW_HEADER;
2236 one_msg_action = TRUE;
2238 else if (Ustrcmp(argrest, "vl") == 0)
2240 msg_action = MSG_SHOW_LOG;
2241 one_msg_action = TRUE;
2243 else { badarg = TRUE; break; }
2245 /* All the -Mxx options require at least one message id. */
2247 msg_action_arg = i + 1;
2248 if (msg_action_arg >= argc)
2250 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2251 return EXIT_FAILURE;
2254 /* Some require only message ids to follow */
2256 if (!one_msg_action)
2259 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2261 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2263 return EXIT_FAILURE;
2265 goto END_ARG; /* Remaining args are ids */
2268 /* Others require only one message id, possibly followed by addresses,
2269 which will be handled as normal arguments. */
2273 if (!mac_ismsgid(argv[msg_action_arg]))
2275 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2276 argv[msg_action_arg], arg);
2277 return EXIT_FAILURE;
2284 /* Some programs seem to call the -om option without the leading o;
2285 for sendmail it askes for "me too". Exim always does this. */
2288 if (*argrest != 0) badarg = TRUE;
2292 /* -N: don't do delivery - a debugging option that stops transports doing
2293 their thing. It implies debugging at the D_v level. */
2298 dont_deliver = TRUE;
2299 debug_selector |= D_v;
2300 debug_file = stderr;
2306 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2312 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2313 option to the specified value. This form uses long names. We need to handle
2314 -O option=value and -Ooption=value. */
2321 fprintf(stderr, "exim: string expected after -O\n");
2329 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2332 if (*argrest == 'A')
2334 alias_arg = argrest + 1;
2335 if (alias_arg[0] == 0)
2337 if (i+1 < argc) alias_arg = argv[++i]; else
2339 fprintf(stderr, "exim: string expected after -oA\n");
2345 /* -oB: Set a connection message max value for remote deliveries */
2347 else if (*argrest == 'B')
2349 uschar *p = argrest + 1;
2352 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2354 connection_max_messages = 1;
2363 fprintf(stderr, "exim: number expected after -oB\n");
2366 connection_max_messages = Uatoi(p);
2370 /* -odb: background delivery */
2372 else if (Ustrcmp(argrest, "db") == 0)
2374 synchronous_delivery = FALSE;
2375 arg_queue_only = FALSE;
2376 queue_only_set = TRUE;
2379 /* -odf: foreground delivery (smail-compatible option); same effect as
2380 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2383 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2385 synchronous_delivery = TRUE;
2386 arg_queue_only = FALSE;
2387 queue_only_set = TRUE;
2390 /* -odq: queue only */
2392 else if (Ustrcmp(argrest, "dq") == 0)
2394 synchronous_delivery = FALSE;
2395 arg_queue_only = TRUE;
2396 queue_only_set = TRUE;
2399 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2400 but no remote delivery */
2402 else if (Ustrcmp(argrest, "dqs") == 0)
2405 arg_queue_only = FALSE;
2406 queue_only_set = TRUE;
2409 /* -oex: Sendmail error flags. As these are also accepted without the
2410 leading -o prefix, for compatibility with vacation and other callers,
2411 they are handled with -e above. */
2413 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2414 -oitrue: Another sendmail syntax for the same */
2416 else if (Ustrcmp(argrest, "i") == 0 ||
2417 Ustrcmp(argrest, "itrue") == 0)
2420 /* -oM*: Set various characteristics for an incoming message; actually
2421 acted on for trusted callers only. */
2423 else if (*argrest == 'M')
2427 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2431 /* -oMa: Set sender host address */
2433 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2435 /* -oMaa: Set authenticator name */
2437 else if (Ustrcmp(argrest, "Maa") == 0)
2438 sender_host_authenticated = argv[++i];
2440 /* -oMas: setting authenticated sender */
2442 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2444 /* -oMai: setting authenticated id */
2446 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2448 /* -oMi: Set incoming interface address */
2450 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2452 /* -oMr: Received protocol */
2454 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2456 /* -oMs: Set sender host name */
2458 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2460 /* -oMt: Set sender ident */
2462 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2464 /* Else a bad argument */
2473 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2474 seem to call this as -m (undocumented), so that is also accepted (see
2477 else if (Ustrcmp(argrest, "m") == 0) {}
2479 /* -oo: An ancient flag for old-style addresses which still seems to
2480 crop up in some calls (see in SCO). */
2482 else if (Ustrcmp(argrest, "o") == 0) {}
2484 /* -oP <name>: set pid file path for daemon */
2486 else if (Ustrcmp(argrest, "P") == 0)
2487 override_pid_file_path = argv[++i];
2489 /* -or <n>: set timeout for non-SMTP acceptance
2490 -os <n>: set timeout for SMTP acceptance */
2492 else if (*argrest == 'r' || *argrest == 's')
2494 int *tp = (*argrest == 'r')?
2495 &arg_receive_timeout : &arg_smtp_receive_timeout;
2496 if (argrest[1] == 0)
2498 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2500 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2503 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2508 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2510 else if (Ustrcmp(argrest, "X") == 0)
2511 override_local_interfaces = argv[++i];
2513 /* Unknown -o argument */
2519 /* -ps: force Perl startup; -pd force delayed Perl startup */
2523 if (*argrest == 's' && argrest[1] == 0)
2525 perl_start_option = 1;
2528 if (*argrest == 'd' && argrest[1] == 0)
2530 perl_start_option = -1;
2535 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2536 which sets the host protocol and host name */
2540 if (i+1 < argc) argrest = argv[++i]; else
2541 { badarg = TRUE; break; }
2546 uschar *hn = Ustrchr(argrest, ':');
2549 received_protocol = argrest;
2553 received_protocol = string_copyn(argrest, hn - argrest);
2554 sender_host_name = hn + 1;
2561 receiving_message = FALSE;
2563 /* -qq...: Do queue runs in a 2-stage manner */
2565 if (*argrest == 'q')
2567 queue_2stage = TRUE;
2571 /* -qi...: Do only first (initial) deliveries */
2573 if (*argrest == 'i')
2575 queue_run_first_delivery = TRUE;
2579 /* -qf...: Run the queue, forcing deliveries
2580 -qff..: Ditto, forcing thawing as well */
2582 if (*argrest == 'f')
2584 queue_run_force = TRUE;
2585 if (*(++argrest) == 'f')
2587 deliver_force_thaw = TRUE;
2592 /* -q[f][f]l...: Run the queue only on local deliveries */
2594 if (*argrest == 'l')
2596 queue_run_local = TRUE;
2600 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2601 optionally starting from a given message id. */
2603 if (*argrest == 0 &&
2604 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2607 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2608 start_queue_run_id = argv[++i];
2609 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2610 stop_queue_run_id = argv[++i];
2613 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2614 optionally local only. */
2619 queue_interval = readconf_readtime(argrest, 0, FALSE);
2621 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2622 if (queue_interval <= 0)
2624 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2631 case 'R': /* Synonymous with -qR... */
2632 receiving_message = FALSE;
2634 /* -Rf: As -R (below) but force all deliveries,
2635 -Rff: Ditto, but also thaw all frozen messages,
2636 -Rr: String is regex
2637 -Rrf: Regex and force
2638 -Rrff: Regex and force and thaw
2640 in all cases provided there are no further characters in this
2646 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2648 if (Ustrcmp(argrest, rsopts[i]) == 0)
2650 if (i != 2) queue_run_force = TRUE;
2651 if (i >= 2) deliver_selectstring_regex = TRUE;
2652 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2653 argrest += Ustrlen(rsopts[i]);
2658 /* -R: Set string to match in addresses for forced queue run to
2659 pick out particular messages. */
2663 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2665 fprintf(stderr, "exim: string expected after -R\n");
2669 else deliver_selectstring = argrest;
2670 if (queue_interval < 0) queue_interval = 0;
2674 /* -r: an obsolete synonym for -f (see above) */
2677 /* -S: Like -R but works on sender. */
2679 case 'S': /* Synonymous with -qS... */
2680 receiving_message = FALSE;
2682 /* -Sf: As -S (below) but force all deliveries,
2683 -Sff: Ditto, but also thaw all frozen messages,
2684 -Sr: String is regex
2685 -Srf: Regex and force
2686 -Srff: Regex and force and thaw
2688 in all cases provided there are no further characters in this
2694 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2696 if (Ustrcmp(argrest, rsopts[i]) == 0)
2698 if (i != 2) queue_run_force = TRUE;
2699 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2700 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2701 argrest += Ustrlen(rsopts[i]);
2706 /* -S: Set string to match in addresses for forced queue run to
2707 pick out particular messages. */
2711 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2713 fprintf(stderr, "exim: string expected after -S\n");
2717 else deliver_selectstring_sender = argrest;
2718 if (queue_interval < 0) queue_interval = 0;
2721 /* -Tqt is an option that is exclusively for use by the testing suite.
2722 It is not recognized in other circumstances. It allows for the setting up
2723 of explicit "queue times" so that various warning/retry things can be
2724 tested. Otherwise variability of clock ticks etc. cause problems. */
2727 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2728 fudged_queue_times = argv[++i];
2733 /* -t: Set flag to extract recipients from body of message. */
2736 if (*argrest == 0) extract_recipients = TRUE;
2738 /* -ti: Set flag to extract recipients from body of message, and also
2739 specify that dot does not end the message. */
2741 else if (Ustrcmp(argrest, "i") == 0)
2743 extract_recipients = TRUE;
2747 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2750 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2757 /* -U: This means "initial user submission" in sendmail, apparently. The
2758 doc claims that in future sendmail may refuse syntactically invalid
2759 messages instead of fixing them. For the moment, we just ignore it. */
2765 /* -v: verify things - this is a very low-level debugging */
2770 debug_selector |= D_v;
2771 debug_file = stderr;
2777 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2779 The -x flag tells the sendmail command that mail from a local
2780 mail program has National Language Support (NLS) extended characters
2781 in the body of the mail item. The sendmail command can send mail with
2782 extended NLS characters across networks that normally corrupts these
2785 As Exim is 8-bit clean, it just ignores this flag. */
2788 if (*argrest != 0) badarg = TRUE;
2791 /* All other initial characters are errors */
2796 } /* End of high-level switch statement */
2798 /* Failed to recognize the option, or syntax error */
2802 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2803 "option %s\n", arg);
2809 /* Arguments have been processed. Check for incompatibilities. */
2813 (smtp_input || extract_recipients || recipients_arg < argc) &&
2814 (daemon_listen || queue_interval >= 0 || bi_option ||
2815 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2816 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2819 msg_action_arg > 0 &&
2820 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2821 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2824 (daemon_listen || queue_interval >= 0) &&
2825 (sender_address != NULL || list_options || list_queue || checking ||
2829 daemon_listen && queue_interval == 0
2833 (checking || smtp_input || extract_recipients ||
2834 filter_test != FTEST_NONE || bi_option)
2837 verify_address_mode &&
2838 (address_test_mode || smtp_input || extract_recipients ||
2839 filter_test != FTEST_NONE || bi_option)
2842 address_test_mode && (smtp_input || extract_recipients ||
2843 filter_test != FTEST_NONE || bi_option)
2846 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2850 deliver_selectstring != NULL && queue_interval < 0
2854 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2858 /* If debugging is set up, set the file and the file descriptor to pass on to
2859 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2860 to run in the foreground. */
2862 if (debug_selector != 0)
2864 debug_file = stderr;
2865 debug_fd = fileno(debug_file);
2866 background_daemon = FALSE;
2867 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2868 if (debug_selector != D_v) /* -v only doesn't show this */
2870 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2871 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2873 show_whats_supported(stderr);
2877 /* When started with root privilege, ensure that the limits on the number of
2878 open files and the number of processes (where that is accessible) are
2879 sufficiently large, or are unset, in case Exim has been called from an
2880 environment where the limits are screwed down. Not all OS have the ability to
2881 change some of these limits. */
2885 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2891 #ifdef RLIMIT_NOFILE
2892 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2894 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2896 rlp.rlim_cur = rlp.rlim_max = 0;
2899 /* I originally chose 1000 as a nice big number that was unlikely to
2900 be exceeded. It turns out that some older OS have a fixed upper limit of
2903 if (rlp.rlim_cur < 1000)
2905 rlp.rlim_cur = rlp.rlim_max = 1000;
2906 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2908 rlp.rlim_cur = rlp.rlim_max = 256;
2909 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2910 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2917 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2919 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2921 rlp.rlim_cur = rlp.rlim_max = 0;
2924 #ifdef RLIM_INFINITY
2925 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2927 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2929 if (rlp.rlim_cur < 1000)
2931 rlp.rlim_cur = rlp.rlim_max = 1000;
2933 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2934 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2940 /* Exim is normally entered as root (but some special configurations are
2941 possible that don't do this). However, it always spins off sub-processes that
2942 set their uid and gid as required for local delivery. We don't want to pass on
2943 any extra groups that root may belong to, so we want to get rid of them all at
2946 We need to obey setgroups() at this stage, before possibly giving up root
2947 privilege for a changed configuration file, but later on we might need to
2948 check on the additional groups for the admin user privilege - can't do that
2949 till after reading the config, which might specify the exim gid. Therefore,
2950 save the group list here first. */
2952 group_count = getgroups(NGROUPS_MAX, group_list);
2954 /* There is a fundamental difference in some BSD systems in the matter of
2955 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2956 known not to be different. On the "different" systems there is a single group
2957 list, and the first entry in it is the current group. On all other versions of
2958 Unix there is a supplementary group list, which is in *addition* to the current
2959 group. Consequently, to get rid of all extraneous groups on a "standard" system
2960 you pass over 0 groups to setgroups(), while on a "different" system you pass
2961 over a single group - the current group, which is always the first group in the
2962 list. Calling setgroups() with zero groups on a "different" system results in
2963 an error return. The following code should cope with both types of system.
2965 However, if this process isn't running as root, setgroups() can't be used
2966 since you have to be root to run it, even if throwing away groups. Not being
2967 root here happens only in some unusual configurations. We just ignore the
2970 if (setgroups(0, NULL) != 0)
2972 if (setgroups(1, group_list) != 0 && !unprivileged)
2974 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2979 /* If the configuration file name has been altered by an argument on the
2980 command line (either a new file name or a macro definition) and the caller is
2981 not root or the exim user, or if this is a filter testing run, remove any
2982 setuid privilege the program has, and run as the underlying user.
2984 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2985 severely restricts the use of -C for some purposes.
2987 Otherwise, set the real ids to the effective values (should be root unless run
2988 from inetd, which it can either be root or the exim uid, if one is configured).
2990 There is a private mechanism for bypassing some of this, in order to make it
2991 possible to test lots of configurations automatically, without having either to
2992 recompile each time, or to patch in an actual configuration file name and other
2993 values (such as the path name). If running in the test harness, pretend that
2994 configuration file changes and macro definitions haven't happened. */
2997 (config_changed || macros != NULL) && /* Config changed, and */
2998 real_uid != root_uid && /* Not root, and */
2999 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3000 real_uid != exim_uid && /* Not exim, and */
3002 !running_in_test_harness /* Not fudged */
3004 expansion_test /* expansion testing */
3006 filter_test != FTEST_NONE) /* Filter testing */
3008 setgroups(group_count, group_list);
3009 exim_setugid(real_uid, real_gid, FALSE,
3010 US"-C, -D, -be or -bf forces real uid");
3011 removed_privilege = TRUE;
3013 /* In the normal case when Exim is called like this, stderr is available
3014 and should be used for any logging information because attempts to write
3015 to the log will usually fail. To arrange this, we unset really_exim. However,
3016 if no stderr is available there is no point - we might as well have a go
3017 at the log (if it fails, syslog will be written). */
3019 if (log_stderr != NULL) really_exim = FALSE;
3022 /* Privilege is to be retained for the moment. It may be dropped later,
3023 depending on the job that this Exim process has been asked to do. For now, set
3024 the real uid to the effective so that subsequent re-execs of Exim are done by a
3027 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3029 /* If testing a filter, open the file(s) now, before wasting time doing other
3030 setups and reading the message. */
3032 if ((filter_test & FTEST_SYSTEM) != 0)
3034 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3037 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3039 return EXIT_FAILURE;
3043 if ((filter_test & FTEST_USER) != 0)
3045 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3048 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3050 return EXIT_FAILURE;
3054 /* Read the main runtime configuration data; this gives up if there
3055 is a failure. It leaves the configuration file open so that the subsequent
3056 configuration data for delivery can be read if needed. */
3060 /* Handle the decoding of logging options. */
3062 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3063 log_options, log_options_count, US"log");
3067 debug_printf("configuration file is %s\n", config_main_filename);
3068 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3069 log_extra_selector);
3072 /* If domain literals are not allowed, check the sender address that was
3073 supplied with -f. Ditto for a stripped trailing dot. */
3075 if (sender_address != NULL)
3077 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3079 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3080 "allowed\n", sender_address);
3081 return EXIT_FAILURE;
3083 if (f_end_dot && !strip_trailing_dot)
3085 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3086 "(trailing dot not allowed)\n", sender_address);
3087 return EXIT_FAILURE;
3091 /* Paranoia check of maximum lengths of certain strings. There is a check
3092 on the length of the log file path in log.c, which will come into effect
3093 if there are any calls to write the log earlier than this. However, if we
3094 get this far but the string is very long, it is better to stop now than to
3095 carry on and (e.g.) receive a message and then have to collapse. The call to
3096 log_write() from here will cause the ultimate panic collapse if the complete
3097 file name exceeds the buffer length. */
3099 if (Ustrlen(log_file_path) > 200)
3100 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3101 "log_file_path is longer than 200 chars: aborting");
3103 if (Ustrlen(pid_file_path) > 200)
3104 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3105 "pid_file_path is longer than 200 chars: aborting");
3107 if (Ustrlen(spool_directory) > 200)
3108 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3109 "spool_directory is longer than 200 chars: aborting");
3111 /* Length check on the process name given to syslog for its TAG field,
3112 which is only permitted to be 32 characters or less. See RFC 3164. */
3114 if (Ustrlen(syslog_processname) > 32)
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3116 "syslog_processname is longer than 32 chars: aborting");
3118 /* In some operating systems, the environment variable TMPDIR controls where
3119 temporary files are created; Exim doesn't use these (apart from when delivering
3120 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3121 If TMPDIR is found in the environment, reset it to the value defined in the
3122 TMPDIR macro, if this macro is defined. */
3127 for (p = USS environ; *p != NULL; p++)
3129 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3130 Ustrcmp(*p+7, TMPDIR) != 0)
3132 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3133 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3135 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3141 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3142 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3143 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3144 called by a user who has set the TZ variable. This then affects the timestamps
3145 in log files and in Received: headers, and any created Date: header lines. The
3146 required timezone is settable in the configuration file, so nothing can be done
3147 about this earlier - but hopefully nothing will normally be logged earlier than
3148 this. We have to make a new environment if TZ is wrong, but don't bother if
3149 timestamps_utc is set, because then all times are in UTC anyway. */
3151 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3153 timestamps_utc = TRUE;
3157 uschar *envtz = US getenv("TZ");
3158 if ((envtz == NULL && timezone_string != NULL) ||
3160 (timezone_string == NULL ||
3161 Ustrcmp(timezone_string, envtz) != 0)))
3163 uschar **p = USS environ;
3167 while (*p++ != NULL) count++;
3168 if (envtz == NULL) count++;
3169 newp = new = malloc(sizeof(uschar *) * (count + 1));
3170 for (p = USS environ; *p != NULL; p++)
3172 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3175 if (timezone_string != NULL)
3177 *newp = malloc(Ustrlen(timezone_string) + 4);
3178 sprintf(CS *newp++, "TZ=%s", timezone_string);
3183 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3184 tod_stamp(tod_log));
3188 /* Handle the case when we have removed the setuid privilege because of -C or
3189 -D. This means that the caller of Exim was not root, and, provided that
3190 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3193 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3194 were running as the exim user defined in the configuration file (different to
3195 the one in the binary). The sysadmin may expect this case to retain privilege
3196 because "the binary was called by the Exim user", but it hasn't, because of the
3197 order in which it handles this stuff. There are two possibilities:
3199 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3200 to do message deliveries. Thus, the fact that it is running as a
3201 non-privileged user is plausible, and might be wanted in some special
3202 configurations. However, really_exim will have been set false when
3203 privilege was dropped, to stop Exim trying to write to its normal log
3204 files. Therefore, re-enable normal log processing, assuming the sysadmin
3205 has set up the log directory correctly.
3207 (2) If deliver_drop_privilege is not set, the configuration won't work as
3208 apparently intended, and so we log a panic message. In order to retain
3209 root for -C or -D, the caller must either be root or the Exim user
3210 defined in the binary (when deliver_drop_ privilege is false).
3212 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3213 built-in exim user or one defined in the configuration. In either event,
3214 re-enable log processing, assuming the sysadmin knows what they are doing. */
3216 if (removed_privilege && (config_changed || macros != NULL) &&
3217 real_uid == exim_uid)
3219 #ifdef ALT_CONFIG_ROOT_ONLY
3220 really_exim = TRUE; /* let logging work normally */
3223 if (deliver_drop_privilege)
3224 really_exim = TRUE; /* let logging work normally */
3226 log_write(0, LOG_MAIN|LOG_PANIC,
3227 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3228 (int)exim_uid, config_changed? "-C" : "-D");
3232 /* Start up Perl interpreter if Perl support is configured and there is a
3233 perl_startup option, and the configuration or the command line specifies
3234 initializing starting. Note that the global variables are actually called
3235 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3238 if (perl_start_option != 0)
3239 opt_perl_at_start = (perl_start_option > 0);
3240 if (opt_perl_at_start && opt_perl_startup != NULL)
3243 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3244 errstr = init_perl(opt_perl_startup);
3247 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3248 return EXIT_FAILURE;
3250 opt_perl_started = TRUE;
3252 #endif /* EXIM_PERL */
3254 /* Log the arguments of the call if the configuration file said so. This is
3255 a debugging feature for finding out what arguments certain MUAs actually use.
3256 Don't attempt it if logging is disabled, or if listing variables or if
3257 verifying/testing addresses or expansions. */
3259 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3260 && really_exim && !list_options && !checking)
3263 uschar *p = big_buffer;
3265 (void)getcwd(CS p+4, big_buffer_size - 4);
3267 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3269 for (i = 0; i < argc; i++)
3271 int len = Ustrlen(argv[i]);
3274 if (p + len + 8 >= big_buffer + big_buffer_size)
3277 log_write(0, LOG_MAIN, "%s", big_buffer);
3278 Ustrcpy(big_buffer, "...");
3281 printing = string_printing(argv[i]);
3282 if (printing[0] == 0) quote = US"\""; else
3284 uschar *pp = printing;
3286 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3288 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3289 (p - big_buffer) - 4), printing, quote);
3293 if ((log_extra_selector & LX_arguments) != 0)
3294 log_write(0, LOG_MAIN, "%s", big_buffer);
3296 debug_printf("%s\n", big_buffer);
3299 /* Set the working directory to be the top-level spool directory. We don't rely
3300 on this in the code, which always uses fully qualified names, but it's useful
3301 for core dumps etc. Don't complain if it fails - the spool directory might not
3302 be generally accessible and calls with the -C option (and others) have lost
3303 privilege by now. */
3305 if (Uchdir(spool_directory) != 0)
3307 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3308 (void)Uchdir(spool_directory);
3311 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3312 alias file. Exim doesn't have such a concept, but this call is screwed into
3313 Sun's YP makefiles. Handle this by calling a configured script, as the real
3314 user who called Exim. The -oA option can be used to pass an argument to the
3319 (void)fclose(config_file);
3320 if (bi_command != NULL)
3324 argv[i++] = bi_command;
3325 if (alias_arg != NULL) argv[i++] = alias_arg;
3328 setgroups(group_count, group_list);
3329 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3331 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3332 (argv[1] == NULL)? US"" : argv[1]);
3334 execv(CS argv[0], (char *const *)argv);
3335 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3340 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3345 /* If an action on specific messages is requested, or if a daemon or queue
3346 runner is being started, we need to know if Exim was called by an admin user.
3347 This is the case if the real user is root or exim, or if the real group is
3348 exim, or if one of the supplementary groups is exim or a group listed in
3349 admin_groups. We don't fail all message actions immediately if not admin_user,
3350 since some actions can be performed by non-admin users. Instead, set admin_user
3351 for later interrogation. */
3353 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3359 for (i = 0; i < group_count; i++)
3361 if (group_list[i] == exim_gid) admin_user = TRUE;
3362 else if (admin_groups != NULL)
3364 for (j = 1; j <= (int)(admin_groups[0]); j++)
3365 if (admin_groups[j] == group_list[i])
3366 { admin_user = TRUE; break; }
3368 if (admin_user) break;
3372 /* Another group of privileged users are the trusted users. These are root,
3373 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3374 are permitted to specify sender_addresses with -f on the command line, and
3375 other message parameters as well. */
3377 if (real_uid == root_uid || real_uid == exim_uid)
3378 trusted_caller = TRUE;
3383 if (trusted_users != NULL)
3385 for (i = 1; i <= (int)(trusted_users[0]); i++)
3386 if (trusted_users[i] == real_uid)
3387 { trusted_caller = TRUE; break; }
3390 if (!trusted_caller && trusted_groups != NULL)
3392 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3394 if (trusted_groups[i] == real_gid)
3395 trusted_caller = TRUE;
3396 else for (j = 0; j < group_count; j++)
3398 if (trusted_groups[i] == group_list[j])
3399 { trusted_caller = TRUE; break; }
3401 if (trusted_caller) break;
3406 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3407 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3409 /* Only an admin user may start the daemon or force a queue run in the default
3410 configuration, but the queue run restriction can be relaxed. Only an admin
3411 user may request that a message be returned to its sender forthwith. Only an
3412 admin user may specify a debug level greater than D_v (because it might show
3413 passwords, etc. in lookup queries). Only an admin user may request a queue
3418 BOOL debugset = (debug_selector & ~D_v) != 0;
3419 if (deliver_give_up || daemon_listen ||
3420 (count_queue && queue_list_requires_admin) ||
3421 (list_queue && queue_list_requires_admin) ||
3422 (queue_interval >= 0 && prod_requires_admin) ||
3423 (debugset && !running_in_test_harness))
3425 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3430 /* If the real user is not root or the exim uid, the argument for passing
3431 in an open TCP/IP connection for another message is not permitted, nor is
3432 running with the -N option for any delivery action, unless this call to exim is
3433 one that supplied an input message, or we are using a patched exim for
3434 regression testing. */
3436 if (real_uid != root_uid && real_uid != exim_uid &&
3437 (continue_hostname != NULL ||
3439 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3440 )) && !running_in_test_harness)
3442 fprintf(stderr, "exim: Permission denied\n");
3443 return EXIT_FAILURE;
3446 /* If the caller is not trusted, certain arguments are ignored when running for
3447 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3448 Note that authority for performing certain actions on messages is tested in the
3449 queue_action() function. */
3451 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3453 sender_host_name = sender_host_address = interface_address =
3454 sender_ident = received_protocol = NULL;
3455 sender_host_port = interface_port = 0;
3456 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3459 /* If a sender host address is set, extract the optional port number off the
3460 end of it and check its syntax. Do the same thing for the interface address.
3461 Exim exits if the syntax is bad. */
3465 if (sender_host_address != NULL)
3466 sender_host_port = check_port(sender_host_address);
3467 if (interface_address != NULL)
3468 interface_port = check_port(interface_address);
3471 /* If an SMTP message is being received check to see if the standard input is a
3472 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3473 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3478 union sockaddr_46 inetd_sock;
3479 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3480 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3482 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3483 if (family == AF_INET || family == AF_INET6)
3485 union sockaddr_46 interface_sock;
3486 size = sizeof(interface_sock);
3488 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3489 interface_address = host_ntoa(-1, &interface_sock, NULL,
3492 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3494 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3497 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3498 NULL, &sender_host_port);
3499 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3500 "inetd is not supported when mua_wrapper is set");
3505 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3506 return EXIT_FAILURE;
3512 /* If the load average is going to be needed while receiving a message, get it
3513 now for those OS that require the first call to os_getloadavg() to be done as
3514 root. There will be further calls later for each message received. */
3516 #ifdef LOAD_AVG_NEEDS_ROOT
3517 if (receiving_message &&
3518 (queue_only_load >= 0 ||
3519 (is_inetd && smtp_load_reserve >= 0)
3522 load_average = os_getloadavg();
3526 /* The queue_only configuration option can be overridden by -odx on the command
3527 line, except that if queue_only_override is false, queue_only cannot be unset
3528 from the command line. */
3530 if (queue_only_set && (queue_only_override || arg_queue_only))
3531 queue_only = arg_queue_only;
3533 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3536 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3537 if (arg_smtp_receive_timeout >= 0)
3538 smtp_receive_timeout = arg_smtp_receive_timeout;
3540 /* If Exim was started with root privilege, unless we have already removed the
3541 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3542 except when starting the daemon or doing some kind of delivery or address
3543 testing (-bt). These are the only cases when root need to be retained. We run
3544 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3545 retained only for starting the daemon. */
3547 if (!unprivileged && /* originally had root AND */
3548 !removed_privilege && /* still got root AND */
3549 !daemon_listen && /* not starting the daemon */
3550 queue_interval <= 0 && /* (either kind of daemon) */
3552 deliver_drop_privilege || /* requested unprivileged */
3554 queue_interval < 0 && /* not running the queue */
3555 (msg_action_arg < 0 || /* and */
3556 msg_action != MSG_DELIVER) && /* not delivering and */
3557 (!checking || !address_test_mode) /* not address checking */
3561 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3564 /* When we are retaining a privileged uid, we still change to the exim gid. */
3566 else setgid(exim_gid);
3568 /* Handle a request to list the delivery queue */
3572 set_process_info("listing the queue");
3573 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3577 /* Handle a request to count the delivery queue */
3581 set_process_info("counting the queue");
3586 /* Handle actions on specific messages, except for the force delivery action,
3587 which is done below. Some actions take a whole list of message ids, which
3588 are known to continue up to the end of the arguments. Others take a single
3589 message id and then operate on the recipients list. */
3591 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3593 int yield = EXIT_SUCCESS;
3594 set_process_info("acting on specified messages");
3596 if (!one_msg_action)
3598 for (i = msg_action_arg; i < argc; i++)
3599 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3600 yield = EXIT_FAILURE;
3603 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3604 recipients_arg)) yield = EXIT_FAILURE;
3608 /* All the modes below here require the remaining configuration sections
3609 to be read, except that we can skip over the ACL setting when delivering
3610 specific messages, or doing a queue run. (For various testing cases we could
3611 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3614 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3616 /* The configuration data will have been read into POOL_PERM because we won't
3617 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3618 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3619 configuration were read into POOL_MAIN, because we don't do any resets till
3620 later on. However, it seems right, and it does ensure that both pools get used.
3623 store_pool = POOL_MAIN;
3625 /* Handle the -brt option. This is for checking out retry configurations.
3626 The next three arguments are a domain name or a complete address, and
3627 optionally two error numbers. All it does is to call the function that
3628 scans the retry configuration data. */
3630 if (test_retry_arg >= 0)
3632 retry_config *yield;
3633 int basic_errno = 0;
3637 if (test_retry_arg >= argc)
3639 printf("-brt needs a domain or address argument\n");
3640 exim_exit(EXIT_FAILURE);
3642 s1 = argv[test_retry_arg++];
3645 /* If the first argument contains no @ and no . it might be a local user
3646 or it might be a single-component name. Treat as a domain. */
3648 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3650 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3651 "being \ntreated as a one-component domain, not as a local part.\n\n",
3655 /* There may be an optional second domain arg. */
3657 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3658 s2 = argv[test_retry_arg++];
3660 /* The final arg is an error name */
3662 if (test_retry_arg < argc)
3664 uschar *ss = argv[test_retry_arg];
3666 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3669 printf("%s\n", CS error);
3670 return EXIT_FAILURE;
3673 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3674 an error is for matching codes to the decade. Turn them into a real error
3675 code, off the decade. */
3677 if (basic_errno == ERRNO_RCPT4XX)
3679 int code = (more_errno >> 8) & 255;
3681 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3682 else if (code > 100)
3683 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3687 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3688 if (yield == NULL) printf("No retry information found\n"); else
3691 more_errno = yield->more_errno;
3692 printf("Retry rule: %s ", yield->pattern);
3694 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3696 printf("quota%s%s ",
3697 (more_errno > 0)? "_" : "",
3698 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3700 else if (yield->basic_errno == ECONNREFUSED)
3702 printf("refused%s%s ",
3703 (more_errno > 0)? "_" : "",
3704 (more_errno == 'M')? "MX" :
3705 (more_errno == 'A')? "A" : "");
3707 else if (yield->basic_errno == ETIMEDOUT)
3710 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3712 if (more_errno != 0) printf("_%s",
3713 (more_errno == 'M')? "MX" : "A");
3716 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3717 printf("auth_failed ");
3720 for (r = yield->rules; r != NULL; r = r->next)
3722 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3723 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3729 printf(",%d.", x/1000);
3743 exim_exit(EXIT_SUCCESS);
3746 /* Handle a request to list one or more configuration options */
3750 set_process_info("listing variables");
3751 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3752 else for (i = recipients_arg; i < argc; i++)
3755 (Ustrcmp(argv[i], "router") == 0 ||
3756 Ustrcmp(argv[i], "transport") == 0 ||
3757 Ustrcmp(argv[i], "authenticator") == 0))
3759 readconf_print(argv[i+1], argv[i]);
3762 else readconf_print(argv[i], NULL);
3764 exim_exit(EXIT_SUCCESS);
3768 /* Handle a request to deliver one or more messages that are already on the
3769 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3770 is typically used for a small number when prodding by hand (when the option
3771 forced_delivery will be set) or when re-execing to regain root privilege.
3772 Each message delivery must happen in a separate process, so we fork a process
3773 for each one, and run them sequentially so that debugging output doesn't get
3774 intertwined, and to avoid spawning too many processes if a long list is given.
3775 However, don't fork for the last one; this saves a process in the common case
3776 when Exim is called to deliver just one message. */
3778 if (msg_action_arg > 0)
3780 if (prod_requires_admin && !admin_user)
3782 fprintf(stderr, "exim: Permission denied\n");
3783 exim_exit(EXIT_FAILURE);
3785 set_process_info("delivering specified messages");
3786 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3787 for (i = msg_action_arg; i < argc; i++)
3792 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3793 else if ((pid = fork()) == 0)
3795 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3796 _exit(EXIT_SUCCESS);
3800 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3802 exim_exit(EXIT_FAILURE);
3806 exim_exit(EXIT_SUCCESS);
3810 /* If only a single queue run is requested, without SMTP listening, we can just
3811 turn into a queue runner, with an optional starting message id. */
3813 if (queue_interval == 0 && !daemon_listen)
3815 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3816 (start_queue_run_id == NULL)? US"" : US" starting at ",
3817 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3818 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3819 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3820 set_process_info("running the queue (single queue run)");
3821 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3822 exim_exit(EXIT_SUCCESS);
3826 /* Find the login name of the real user running this process. This is always
3827 needed when receiving a message, because it is written into the spool file. It
3828 may also be used to construct a from: or a sender: header, and in this case we
3829 need the user's full name as well, so save a copy of it, checked for RFC822
3830 syntax and munged if necessary, if it hasn't previously been set by the -F
3831 argument. We may try to get the passwd entry more than once, in case NIS or
3832 other delays are in evidence. Save the home directory for use in filter testing
3837 if ((pw = getpwuid(real_uid)) != NULL)
3839 originator_login = string_copy(US pw->pw_name);
3840 originator_home = string_copy(US pw->pw_dir);
3842 /* If user name has not been set by -F, set it from the passwd entry
3843 unless -f has been used to set the sender address by a trusted user. */
3845 if (originator_name == NULL)
3847 if (sender_address == NULL ||
3848 (!trusted_caller && filter_test == FTEST_NONE))
3850 uschar *name = US pw->pw_gecos;
3851 uschar *amp = Ustrchr(name, '&');
3854 /* Most Unix specify that a '&' character in the gecos field is
3855 replaced by a copy of the login name, and some even specify that
3856 the first character should be upper cased, so that's what we do. */
3861 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3862 amp - name, name, &loffset, originator_login, amp + 1);
3863 buffer[loffset] = toupper(buffer[loffset]);
3867 /* If a pattern for matching the gecos field was supplied, apply
3868 it and then expand the name string. */
3870 if (gecos_pattern != NULL && gecos_name != NULL)
3873 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3875 if (regex_match_and_setup(re, name, 0, -1))
3877 uschar *new_name = expand_string(gecos_name);
3879 if (new_name != NULL)
3881 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3882 "gecos field \"%s\"\n", new_name, name);
3885 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3886 "\"%s\": %s\n", gecos_name, expand_string_message);
3888 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3889 "gecos field \"%s\"\n", gecos_pattern, name);
3890 store_free((void *)re);
3892 originator_name = string_copy(name);
3895 /* A trusted caller has used -f but not -F */
3897 else originator_name = US"";
3900 /* Break the retry loop */
3905 if (++i > finduser_retries) break;
3909 /* If we cannot get a user login, log the incident and give up, unless the
3910 configuration specifies something to use. When running in the test harness,
3911 any setting of unknown_login overrides the actual login name. */
3913 if (originator_login == NULL || running_in_test_harness)
3915 if (unknown_login != NULL)
3917 originator_login = expand_string(unknown_login);
3918 if (originator_name == NULL && unknown_username != NULL)
3919 originator_name = expand_string(unknown_username);
3920 if (originator_name == NULL) originator_name = US"";
3922 if (originator_login == NULL)
3923 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3927 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3930 originator_name = string_copy(parse_fix_phrase(originator_name,
3931 Ustrlen(originator_name), big_buffer, big_buffer_size));
3933 /* If a message is created by this call of Exim, the uid/gid of its originator
3934 are those of the caller. These values are overridden if an existing message is
3935 read in from the spool. */
3937 originator_uid = real_uid;
3938 originator_gid = real_gid;
3940 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3941 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3943 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3944 returns. We leave this till here so that the originator_ fields are available
3945 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3948 if (daemon_listen || queue_interval > 0)
3952 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3953 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3954 "mua_wrapper is set");
3959 /* If the sender ident has not been set (by a trusted caller) set it to
3960 the caller. This will get overwritten below for an inetd call. If a trusted
3961 caller has set it empty, unset it. */
3963 if (sender_ident == NULL) sender_ident = originator_login;
3964 else if (sender_ident[0] == 0) sender_ident = NULL;
3966 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3967 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3968 originator_* variables set. */
3970 if (test_rewrite_arg >= 0)
3972 really_exim = FALSE;
3973 if (test_rewrite_arg >= argc)
3975 printf("-brw needs an address argument\n");
3976 exim_exit(EXIT_FAILURE);
3978 rewrite_test(argv[test_rewrite_arg]);
3979 exim_exit(EXIT_SUCCESS);
3982 /* A locally-supplied message is considered to be coming from a local user
3983 unless a trusted caller supplies a sender address with -f, or is passing in the
3984 message via SMTP (inetd invocation or otherwise). */
3986 if ((sender_address == NULL && !smtp_input) ||
3987 (!trusted_caller && filter_test == FTEST_NONE))
3989 sender_local = TRUE;
3991 /* A trusted caller can supply authenticated_sender and authenticated_id
3992 via -oMas and -oMai and if so, they will already be set. */
3994 if (authenticated_sender == NULL)
3995 authenticated_sender = string_sprintf("%s@%s", originator_login,
3996 qualify_domain_sender);
3997 if (authenticated_id == NULL) authenticated_id = originator_login;
4000 /* Trusted callers are always permitted to specify the sender address.
4001 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4002 is specified is the empty address. However, if a trusted caller does not
4003 specify a sender address for SMTP input, we leave sender_address unset. This
4004 causes the MAIL commands to be honoured. */
4006 if ((!smtp_input && sender_address == NULL) ||
4007 !receive_check_set_sender(sender_address))
4009 /* Either the caller is not permitted to set a general sender, or this is
4010 non-SMTP input and the trusted caller has not set a sender. If there is no
4011 sender, or if a sender other than <> is set, override with the originator's
4012 login (which will get qualified below), except when checking things. */
4014 if (sender_address == NULL /* No sender_address set */
4016 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4017 !checking && /* Not running tests, AND */
4018 filter_test == FTEST_NONE)) /* Not testing a filter */
4020 sender_address = originator_login;
4021 sender_address_forced = FALSE;
4022 sender_address_domain = 0;
4026 /* Remember whether an untrusted caller set the sender address */
4028 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4030 /* Ensure that the sender address is fully qualified unless it is the empty
4031 address, which indicates an error message, or doesn't exist (root caller, smtp
4032 interface, no -f argument). */
4034 if (sender_address != NULL && sender_address[0] != 0 &&
4035 sender_address_domain == 0)
4036 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4037 qualify_domain_sender);
4039 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4041 /* Handle a request to verify a list of addresses, or test them for delivery.
4042 This must follow the setting of the sender address, since routers can be
4043 predicated upon the sender. If no arguments are given, read addresses from
4044 stdin. Set debug_level to at least D_v to get full output for address testing.
4047 if (verify_address_mode || address_test_mode)
4050 int flags = vopt_qualify;
4052 if (verify_address_mode)
4054 if (!verify_as_sender) flags |= vopt_is_recipient;
4055 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4060 flags |= vopt_is_recipient;
4061 debug_selector |= D_v;
4062 debug_file = stderr;
4063 debug_fd = fileno(debug_file);
4064 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4067 if (recipients_arg < argc)
4069 while (recipients_arg < argc)
4071 uschar *s = argv[recipients_arg++];
4074 BOOL finished = FALSE;
4075 uschar *ss = parse_find_address_end(s, FALSE);
4076 if (*ss == ',') *ss = 0; else finished = TRUE;
4077 test_address(s, flags, &exit_value);
4080 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4087 uschar *s = get_stdinput(NULL, NULL);
4088 if (s == NULL) break;
4089 test_address(s, flags, &exit_value);
4093 exim_exit(exit_value);
4096 /* Handle expansion checking */
4100 if (recipients_arg < argc)
4102 while (recipients_arg < argc)
4104 uschar *s = argv[recipients_arg++];
4105 uschar *ss = expand_string(s);
4107 printf ("Failed: %s\n", expand_string_message);
4108 else printf("%s\n", CS ss);
4116 char *(*fn_readline)(char *) = NULL;
4117 char *(*fn_addhist)(char *) = NULL;
4120 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4126 uschar *source = get_stdinput(fn_readline, fn_addhist);
4127 if (source == NULL) break;
4128 ss = expand_string(source);
4130 printf ("Failed: %s\n", expand_string_message);
4131 else printf("%s\n", CS ss);
4135 if (dlhandle != NULL) dlclose(dlhandle);
4139 exim_exit(EXIT_SUCCESS);
4143 /* The active host name is normally the primary host name, but it can be varied
4144 for hosts that want to play several parts at once. We need to ensure that it is
4145 set for host checking, and for receiving messages. */
4147 smtp_active_hostname = primary_hostname;
4148 if (raw_active_hostname != NULL)
4150 uschar *nah = expand_string(raw_active_hostname);
4153 if (!expand_string_forcedfail)
4154 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4155 "(smtp_active_hostname): %s", raw_active_hostname,
4156 expand_string_message);
4158 else if (nah[0] != 0) smtp_active_hostname = nah;
4161 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4162 given IP address so that the blocking and relay configuration can be tested. An
4163 RFC 1413 call is made only if we are running in the test harness and an
4164 incoming interface and both ports are specified, because there is no TCP/IP
4165 call to find the ident for. */
4172 sender_ident = NULL;
4173 if (running_in_test_harness && sender_host_port != 0 &&
4174 interface_address != NULL && interface_port != 0)
4175 verify_get_ident(1413);
4177 /* In case the given address is a non-canonical IPv6 address, canonicize
4178 it. The code works for both IPv4 and IPv6, as it happens. */
4180 size = host_aton(sender_host_address, x);
4181 sender_host_address = store_get(48); /* large enough for full IPv6 */
4182 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4184 /* Now set up for testing */
4186 host_build_sender_fullhost();
4190 sender_local = FALSE;
4191 sender_host_notsocket = TRUE;
4192 debug_file = stderr;
4193 debug_fd = fileno(debug_file);
4194 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4195 "**** but without any ident (RFC 1413) callback.\n"
4196 "**** This is not for real!\n\n",
4197 sender_host_address);
4199 if (verify_check_host(&hosts_connection_nolog) == OK)
4200 log_write_selector &= ~L_smtp_connection;
4201 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4203 if (smtp_start_session())
4205 reset_point = store_get(0);
4208 store_reset(reset_point);
4209 if (smtp_setup_msg() <= 0) break;
4210 if (!receive_msg(FALSE)) break;
4213 exim_exit(EXIT_SUCCESS);
4217 /* Arrange for message reception if recipients or SMTP were specified;
4218 otherwise complain unless a version print (-bV) happened or this is a filter
4219 verification test. In the former case, show the configuration file name. */
4221 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4223 if (version_printed)
4225 printf("Configuration file is %s\n", config_main_filename);
4226 return EXIT_SUCCESS;
4228 if (filter_test == FTEST_NONE)
4231 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4232 "not directly from a shell command line. Options and/or arguments control\n"
4233 "what it does when called. For a list of options, see the Exim documentation.\n");
4234 return EXIT_FAILURE;
4239 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4240 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4241 that we are not called from inetd, because that is rejected above. The
4242 following configuration settings are forced here:
4244 (1) Synchronous delivery (-odi)
4245 (2) Errors to stderr (-oep == -oeq)
4246 (3) No parallel remote delivery
4247 (4) Unprivileged delivery
4249 We don't force overall queueing options because there are several of them;
4250 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4251 to override any SMTP queueing. */
4255 synchronous_delivery = TRUE;
4256 arg_error_handling = ERRORS_STDERR;
4257 remote_max_parallel = 1;
4258 deliver_drop_privilege = TRUE;
4260 queue_smtp_domains = NULL;
4264 /* Prepare to accept one or more new messages on the standard input. When a
4265 message has been read, its id is returned in message_id[]. If doing immediate
4266 delivery, we fork a delivery process for each received message, except for the
4267 last one, where we can save a process switch.
4269 It is only in non-smtp mode that error_handling is allowed to be changed from
4270 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4271 sendmail error modes other than -oem ever actually used? Later: yes.) */
4273 if (!smtp_input) error_handling = arg_error_handling;
4275 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4276 logging being sent down the socket and make an identd call to get the
4281 (void)fclose(stderr);
4282 exim_nullstd(); /* Re-open to /dev/null */
4283 verify_get_ident(IDENT_PORT);
4284 host_build_sender_fullhost();
4285 set_process_info("handling incoming connection from %s via inetd",
4289 /* If the sender host address has been set, build sender_fullhost if it hasn't
4290 already been done (which it will have been for inetd). This caters for the
4291 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4292 so that the test for IP options is skipped for -bs input. */
4294 if (sender_host_address != NULL && sender_fullhost == NULL)
4296 host_build_sender_fullhost();
4297 set_process_info("handling incoming connection from %s via -oMa",
4299 sender_host_notsocket = TRUE;
4302 /* Otherwise, set the sender host as unknown except for inetd calls. This
4303 prevents host checking in the case of -bs not from inetd and also for -bS. */
4305 else if (!is_inetd) sender_host_unknown = TRUE;
4307 /* If stdout does not exist, then dup stdin to stdout. This can happen
4308 if exim is started from inetd. In this case fd 0 will be set to the socket,
4309 but fd 1 will not be set. This also happens for passed SMTP channels. */
4311 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4313 /* Set up the incoming protocol name and the state of the program. Root
4314 is allowed to force received protocol via the -oMr option above, and if we are
4315 in a non-local SMTP state it means we have come via inetd and the process info
4316 has already been set up. We don't set received_protocol here for smtp input,
4317 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4321 if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4326 if (received_protocol == NULL)
4327 received_protocol = string_sprintf("local%s", called_as);
4328 set_process_info("accepting a local non-SMTP message from <%s>",
4332 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4336 local_queue_only = queue_only;
4338 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4339 the spool if so configured. On failure, we must not attempt to send an error
4340 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4341 error code is given.) */
4343 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4345 fprintf(stderr, "exim: insufficient disk space\n");
4346 return EXIT_FAILURE;
4349 /* If this is smtp input of any kind, handle the start of the SMTP
4356 if (verify_check_host(&hosts_connection_nolog) == OK)
4357 log_write_selector &= ~L_smtp_connection;
4358 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4359 if (!smtp_start_session())
4362 exim_exit(EXIT_SUCCESS);
4366 /* Otherwise, set up the input size limit here */
4370 thismessage_size_limit = expand_string_integer(message_size_limit);
4371 if (thismessage_size_limit < 0)
4373 if (thismessage_size_limit == -1)
4374 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4375 "message_size_limit: %s", expand_string_message);
4377 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4378 "message_size_limit: %s", expand_string_message);
4382 /* Loop for several messages when reading SMTP input. If we fork any child
4383 processes, we don't want to wait for them unless synchronous delivery is
4384 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4385 same as SIG_DFL, despite the fact that documentation often lists the default as
4386 "ignore". This is a confusing area. This is what I know:
4388 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4389 processes that complete simply to go away without ever becoming defunct. You
4390 can't then wait for them - but we don't want to wait for them in the
4391 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4392 happen for all OS (e.g. *BSD is different).
4394 But that's not the end of the story. Some (many? all?) systems have the
4395 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4396 has by default, so it seems that the difference is merely one of default
4397 (compare restarting vs non-restarting signals).
4399 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4400 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4401 of the loop below. Paranoia rules.
4403 February 2003: That's *still* not the end of the story. There are now versions
4404 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4405 process then calls waitpid(), a grumble is written to the system log, because
4406 this is logically inconsistent. In other words, it doesn't like the paranoia.
4407 As a consequenc of this, the waitpid() below is now excluded if we are sure
4408 that SIG_IGN works. */
4410 if (!synchronous_delivery)
4413 struct sigaction act;
4414 act.sa_handler = SIG_IGN;
4415 sigemptyset(&(act.sa_mask));
4416 act.sa_flags = SA_NOCLDWAIT;
4417 sigaction(SIGCHLD, &act, NULL);
4419 signal(SIGCHLD, SIG_IGN);
4423 /* Save the current store pool point, for resetting at the start of
4424 each message, and save the real sender address, if any. */
4426 reset_point = store_get(0);
4427 real_sender_address = sender_address;
4429 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4430 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4435 store_reset(reset_point);
4438 /* In the SMTP case, we have to handle the initial SMTP input and build the
4439 recipients list, before calling receive_msg() to read the message proper.
4440 Whatever sender address is actually given in the SMTP transaction is
4441 actually ignored for local senders - we use the actual sender, which is
4442 normally either the underlying user running this process or a -f argument
4443 provided by a trusted caller. It is saved in real_sender_address.
4445 However, if this value is NULL, we are dealing with a trusted caller when
4446 -f was not used; in this case, the SMTP sender is allowed to stand.
4448 Also, if untrusted_set_sender is set, we permit sender addresses that match
4449 anything in its list.
4451 The variable raw_sender_address holds the sender address before rewriting. */
4456 if ((rc = smtp_setup_msg()) > 0)
4458 if (real_sender_address != NULL &&
4459 !receive_check_set_sender(sender_address))
4461 sender_address = raw_sender = real_sender_address;
4462 sender_address_unrewritten = NULL;
4464 more = receive_msg(extract_recipients);
4465 if (message_id[0] == 0)
4468 exim_exit(EXIT_FAILURE);
4471 else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4474 /* In the non-SMTP case, we have all the information from the command
4475 line, but must process it in case it is in the more general RFC822
4476 format, and in any case, to detect syntax errors. Also, it appears that
4477 the use of comma-separated lists as single arguments is common, so we
4478 had better support them. */
4484 int count = argc - recipients_arg;
4485 uschar **list = argv + recipients_arg;
4487 /* These options cannot be changed dynamically for non-SMTP messages */
4489 active_local_sender_retain = local_sender_retain;
4490 active_local_from_check = local_from_check;
4492 /* Save before any rewriting */
4494 raw_sender = string_copy(sender_address);
4496 /* Loop for each argument */
4498 for (i = 0; i < count; i++)
4500 int start, end, domain;
4502 uschar *s = list[i];
4504 /* Loop for each comma-separated address */
4508 BOOL finished = FALSE;
4510 uschar *ss = parse_find_address_end(s, FALSE);
4512 if (*ss == ',') *ss = 0; else finished = TRUE;
4514 /* Check max recipients - if -t was used, these aren't recipients */
4516 if (recipients_max > 0 && ++rcount > recipients_max &&
4517 !extract_recipients)
4519 if (error_handling == ERRORS_STDERR)
4521 fprintf(stderr, "exim: too many recipients\n");
4522 exim_exit(EXIT_FAILURE);
4527 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4528 errors_sender_rc : EXIT_FAILURE;
4533 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4535 if (domain == 0 && !allow_unqualified_recipient)
4538 errmess = US"unqualified recipient address not allowed";
4541 if (recipient == NULL)
4543 if (error_handling == ERRORS_STDERR)
4545 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4546 string_printing(list[i]), errmess);
4547 exim_exit(EXIT_FAILURE);
4553 eblock.text1 = string_printing(list[i]);
4554 eblock.text2 = errmess;
4556 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4557 errors_sender_rc : EXIT_FAILURE;
4561 receive_add_recipient(recipient, -1);
4564 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4568 /* Show the recipients when debugging */
4573 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4574 if (recipients_list != NULL)
4576 debug_printf("Recipients:\n");
4577 for (i = 0; i < recipients_count; i++)
4578 debug_printf(" %s\n", recipients_list[i].address);
4582 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4583 will just read the headers for the message, and not write anything onto the
4586 message_ended = END_NOTENDED;
4587 more = receive_msg(extract_recipients);
4589 /* more is always FALSE here (not SMTP message) when reading a message
4590 for real; when reading the headers of a message for filter testing,
4591 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4593 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4594 } /* Non-SMTP message reception */
4596 /* If this is a filter testing run, there are headers in store, but
4597 no message on the spool. Run the filtering code in testing mode, setting
4598 the domain to the qualify domain and the local part to the current user,
4599 unless they have been set by options. The prefix and suffix are left unset
4600 unless specified. The the return path is set to to the sender unless it has
4601 already been set from a return-path header in the message. */
4603 if (filter_test != FTEST_NONE)
4605 deliver_domain = (ftest_domain != NULL)?
4606 ftest_domain : qualify_domain_recipient;
4607 deliver_domain_orig = deliver_domain;
4608 deliver_localpart = (ftest_localpart != NULL)?
4609 ftest_localpart : originator_login;
4610 deliver_localpart_orig = deliver_localpart;
4611 deliver_localpart_prefix = ftest_prefix;
4612 deliver_localpart_suffix = ftest_suffix;
4613 deliver_home = originator_home;
4615 if (return_path == NULL)
4617 printf("Return-path copied from sender\n");
4618 return_path = string_copy(sender_address);
4622 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4624 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4626 receive_add_recipient(
4627 string_sprintf("%s%s%s@%s",
4628 (ftest_prefix == NULL)? US"" : ftest_prefix,
4630 (ftest_suffix == NULL)? US"" : ftest_suffix,
4631 deliver_domain), -1);
4633 printf("Recipient = %s\n", recipients_list[0].address);
4634 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4635 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4637 (void)chdir("/"); /* Get away from wherever the user is running this from */
4639 /* Now we run either a system filter test, or a user filter test, or both.
4640 In the latter case, headers added by the system filter will persist and be
4641 available to the user filter. We need to copy the filter variables
4644 if ((filter_test & FTEST_SYSTEM) != 0)
4646 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4647 exim_exit(EXIT_FAILURE);
4650 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4652 if ((filter_test & FTEST_USER) != 0)
4654 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4655 exim_exit(EXIT_FAILURE);
4658 exim_exit(EXIT_SUCCESS);
4661 /* Else act on the result of message reception. We should not get here unless
4662 message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4663 TRUE. If it is not, check on the number of messages received in this
4664 connection. If that's OK and queue_only_load is set, check that the load
4665 average is below it. If it is not, set local_queue_only TRUE. Note that it
4666 then remains this way for any subsequent messages on the same SMTP connection.
4667 This is a deliberate choice; even though the load average may fall, it
4668 doesn't seem right to deliver later messages on the same call when not
4669 delivering earlier ones. */
4671 if (!local_queue_only)
4673 if (smtp_accept_queue_per_connection > 0 &&
4674 receive_messagecount > smtp_accept_queue_per_connection)
4676 local_queue_only = TRUE;
4677 queue_only_reason = 2;
4679 else if (queue_only_load >= 0)
4681 local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4682 if (local_queue_only) queue_only_reason = 3;
4686 /* If running as an MUA wrapper, all queueing options and freezing options
4690 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4692 /* Log the queueing here, when it will get a message id attached, but
4693 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4696 if (local_queue_only) switch(queue_only_reason)
4699 log_write(L_delay_delivery,
4700 LOG_MAIN, "no immediate delivery: more than %d messages "
4701 "received in one connection", smtp_accept_queue_per_connection);
4705 log_write(L_delay_delivery,
4706 LOG_MAIN, "no immediate delivery: load average %.2f",
4707 (double)load_average/1000.0);
4711 /* Else do the delivery unless the ACL or local_scan() called for queue only
4712 or froze the message. Always deliver in a separate process. A fork failure is
4713 not a disaster, as the delivery will eventually happen on a subsequent queue
4714 run. The search cache must be tidied before the fork, as the parent will
4715 do it before exiting. The child will trigger a lookup failure and
4716 thereby defer the delivery if it tries to use (for example) a cached ldap
4717 connection that the parent has called unbind on. */
4719 else if (!queue_only_policy && !deliver_freeze)
4724 if ((pid = fork()) == 0)
4727 close_unwanted(); /* Close unwanted file descriptors and TLS */
4728 exim_nullstd(); /* Ensure std{in,out,err} exist */
4730 /* Occasionally in the test harness we don't have synchronous delivery
4731 set (can happen with bounces). In that case, let the old process finish
4732 before continuing, to keep the debug output the same. */
4734 if (running_in_test_harness && !synchronous_delivery) millisleep(100);
4736 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4737 mode, deliver_drop_privilege is forced TRUE). */
4739 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4741 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4743 /* Control does not return here. */
4746 /* No need to re-exec */
4748 rc = deliver_message(message_id, FALSE, FALSE);
4750 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4751 EXIT_SUCCESS : EXIT_FAILURE);
4756 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4757 "process: %s", strerror(errno));
4760 /* In the parent, wait if synchronous delivery is required. This will
4761 always be the case in MUA wrapper mode. */
4763 else if (synchronous_delivery)
4766 while (wait(&status) != pid);
4767 if ((status & 0x00ff) != 0)
4768 log_write(0, LOG_MAIN|LOG_PANIC,
4769 "process %d crashed with signal %d while delivering %s",
4770 (int)pid, status & 0x00ff, message_id);
4771 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4775 /* The loop will repeat if more is TRUE. If we do not know know that the OS
4776 automatically reaps children (see comments above the loop), clear away any
4777 finished subprocesses here, in case there are lots of messages coming in
4778 from the same source. */
4780 #ifndef SIG_IGN_WORKS
4781 while (waitpid(-1, NULL, WNOHANG) > 0);
4785 exim_exit(EXIT_SUCCESS); /* Never returns */
4786 return 0; /* To stop compiler warning */