1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
26 extern void init_lookup_list(void);
30 /*************************************************
31 * Function interface to store functions *
32 *************************************************/
34 /* We need some real functions to pass to the PCRE regular expression library
35 for store allocation via Exim's store manager. The normal calls are actually
36 macros that pass over location information to make tracing easier. These
37 functions just interface to the standard macro calls. A good compiler will
38 optimize out the tail recursion and so not make them too expensive. There
39 are two sets of functions; one for use when we want to retain the compiled
40 regular expression for a long time; the other for short-term use. */
43 function_store_get(size_t size)
45 return store_get((int)size);
49 function_dummy_free(void *block) { block = block; }
52 function_store_malloc(size_t size)
54 return store_malloc((int)size);
58 function_store_free(void *block)
66 /*************************************************
67 * Enums for cmdline interface *
68 *************************************************/
70 enum commandline_info { CMDINFO_NONE=0,
71 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
76 /*************************************************
77 * Compile regular expression and panic on fail *
78 *************************************************/
80 /* This function is called when failure to compile a regular expression leads
81 to a panic exit. In other cases, pcre_compile() is called directly. In many
82 cases where this function is used, the results of the compilation are to be
83 placed in long-lived store, so we temporarily reset the store management
84 functions that PCRE uses if the use_malloc flag is set.
87 pattern the pattern to compile
88 caseless TRUE if caseless matching is required
89 use_malloc TRUE if compile into malloc store
91 Returns: pointer to the compiled pattern
95 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
98 int options = PCRE_COPT;
103 pcre_malloc = function_store_malloc;
104 pcre_free = function_store_free;
106 if (caseless) options |= PCRE_CASELESS;
107 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
108 pcre_malloc = function_store_get;
109 pcre_free = function_dummy_free;
111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
112 "%s at offset %d while compiling %s", error, offset, pattern);
119 /*************************************************
120 * Execute regular expression and set strings *
121 *************************************************/
123 /* This function runs a regular expression match, and sets up the pointers to
124 the matched substrings.
127 re the compiled expression
128 subject the subject string
129 options additional PCRE options
130 setup if < 0 do full setup
131 if >= 0 setup from setup+1 onwards,
132 excluding the full matched string
134 Returns: TRUE or FALSE
138 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
140 int ovector[3*(EXPAND_MAXN+1)];
141 uschar * s = string_copy(subject); /* de-constifying */
142 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
143 PCRE_EOPT | options, ovector, nelem(ovector));
145 if (n == 0) n = EXPAND_MAXN + 1;
149 expand_nmax = setup < 0 ? 0 : setup + 1;
150 for (nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
152 expand_nstring[expand_nmax] = s + ovector[nn];
153 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
163 /*************************************************
164 * Set up processing details *
165 *************************************************/
167 /* Save a text string for dumping when SIGUSR1 is received.
168 Do checks for overruns.
170 Arguments: format and arguments, as for printf()
175 set_process_info(const char *format, ...)
177 int len = sprintf(CS process_info, "%5d ", (int)getpid());
179 va_start(ap, format);
180 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
181 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
182 len = Ustrlen(process_info);
183 process_info[len+0] = '\n';
184 process_info[len+1] = '\0';
185 process_info_len = len + 1;
186 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
190 /***********************************************
191 * Handler for SIGTERM *
192 ***********************************************/
195 term_handler(int sig)
201 /*************************************************
202 * Handler for SIGUSR1 *
203 *************************************************/
205 /* SIGUSR1 causes any exim process to write to the process log details of
206 what it is currently doing. It will only be used if the OS is capable of
207 setting up a handler that causes automatic restarting of any system call
208 that is in progress at the time.
210 This function takes care to be signal-safe.
212 Argument: the signal number (SIGUSR1)
217 usr1_handler(int sig)
221 os_restarting_signal(sig, usr1_handler);
223 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
225 /* If we are already running as the Exim user, try to create it in the
226 current process (assuming spool_directory exists). Otherwise, if we are
227 root, do the creation in an exim:exim subprocess. */
229 int euid = geteuid();
230 if (euid == exim_uid)
231 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
232 else if (euid == root_uid)
233 fd = log_create_as_exim(process_log_path);
236 /* If we are neither exim nor root, or if we failed to create the log file,
237 give up. There is not much useful we can do with errors, since we don't want
238 to disrupt whatever is going on outside the signal handler. */
242 (void)write(fd, process_info, process_info_len);
248 /*************************************************
250 *************************************************/
252 /* This handler is enabled most of the time that Exim is running. The handler
253 doesn't actually get used unless alarm() has been called to set a timer, to
254 place a time limit on a system call of some kind. When the handler is run, it
257 There are some other SIGALRM handlers that are used in special cases when more
258 than just a flag setting is required; for example, when reading a message's
259 input. These are normally set up in the code module that uses them, and the
260 SIGALRM handler is reset to this one afterwards.
262 Argument: the signal value (SIGALRM)
267 sigalrm_handler(int sig)
269 sig = sig; /* Keep picky compilers happy */
271 os_non_restarting_signal(SIGALRM, sigalrm_handler);
276 /*************************************************
277 * Sleep for a fractional time interval *
278 *************************************************/
280 /* This function is called by millisleep() and exim_wait_tick() to wait for a
281 period of time that may include a fraction of a second. The coding is somewhat
282 tedious. We do not expect setitimer() ever to fail, but if it does, the process
283 will wait for ever, so we panic in this instance. (There was a case of this
284 when a bug in a function that calls milliwait() caused it to pass invalid data.
285 That's when I added the check. :-)
287 We assume it to be not worth sleeping for under 100us; this value will
288 require revisiting as hardware advances. This avoids the issue of
289 a zero-valued timer setting meaning "never fire".
291 Argument: an itimerval structure containing the interval
296 milliwait(struct itimerval *itval)
299 sigset_t old_sigmask;
301 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
303 (void)sigemptyset(&sigmask); /* Empty mask */
304 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
305 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
306 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
307 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
308 "setitimer() failed: %s", strerror(errno));
309 (void)sigfillset(&sigmask); /* All signals */
310 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
311 (void)sigsuspend(&sigmask); /* Until SIGALRM */
312 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
318 /*************************************************
319 * Millisecond sleep function *
320 *************************************************/
322 /* The basic sleep() function has a granularity of 1 second, which is too rough
323 in some cases - for example, when using an increasing delay to slow down
326 Argument: number of millseconds
333 struct itimerval itval;
334 itval.it_interval.tv_sec = 0;
335 itval.it_interval.tv_usec = 0;
336 itval.it_value.tv_sec = msec/1000;
337 itval.it_value.tv_usec = (msec % 1000) * 1000;
343 /*************************************************
344 * Compare microsecond times *
345 *************************************************/
352 Returns: -1, 0, or +1
356 exim_tvcmp(struct timeval *t1, struct timeval *t2)
358 if (t1->tv_sec > t2->tv_sec) return +1;
359 if (t1->tv_sec < t2->tv_sec) return -1;
360 if (t1->tv_usec > t2->tv_usec) return +1;
361 if (t1->tv_usec < t2->tv_usec) return -1;
368 /*************************************************
369 * Clock tick wait function *
370 *************************************************/
372 /* Exim uses a time + a pid to generate a unique identifier in two places: its
373 message IDs, and in file names for maildir deliveries. Because some OS now
374 re-use pids within the same second, sub-second times are now being used.
375 However, for absolute certainty, we must ensure the clock has ticked before
376 allowing the relevant process to complete. At the time of implementation of
377 this code (February 2003), the speed of processors is such that the clock will
378 invariably have ticked already by the time a process has done its job. This
379 function prepares for the time when things are faster - and it also copes with
380 clocks that go backwards.
383 then_tv A timeval which was used to create uniqueness; its usec field
384 has been rounded down to the value of the resolution.
385 We want to be sure the current time is greater than this.
386 resolution The resolution that was used to divide the microseconds
387 (1 for maildir, larger for message ids)
393 exim_wait_tick(struct timeval *then_tv, int resolution)
395 struct timeval now_tv;
396 long int now_true_usec;
398 (void)gettimeofday(&now_tv, NULL);
399 now_true_usec = now_tv.tv_usec;
400 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
402 if (exim_tvcmp(&now_tv, then_tv) <= 0)
404 struct itimerval itval;
405 itval.it_interval.tv_sec = 0;
406 itval.it_interval.tv_usec = 0;
407 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
408 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
410 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
411 negative value for the microseconds is possible only in the case when "now"
412 is more than a second less than "then". That means that itval.it_value.tv_sec
413 is greater than zero. The following correction is therefore safe. */
415 if (itval.it_value.tv_usec < 0)
417 itval.it_value.tv_usec += 1000000;
418 itval.it_value.tv_sec -= 1;
421 DEBUG(D_transport|D_receive)
423 if (!f.running_in_test_harness)
425 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
426 then_tv->tv_sec, (long) then_tv->tv_usec,
427 now_tv.tv_sec, (long) now_tv.tv_usec);
428 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
429 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
440 /*************************************************
441 * Call fopen() with umask 777 and adjust mode *
442 *************************************************/
444 /* Exim runs with umask(0) so that files created with open() have the mode that
445 is specified in the open() call. However, there are some files, typically in
446 the spool directory, that are created with fopen(). They end up world-writeable
447 if no precautions are taken. Although the spool directory is not accessible to
448 the world, this is an untidiness. So this is a wrapper function for fopen()
449 that sorts out the mode of the created file.
452 filename the file name
453 options the fopen() options
454 mode the required mode
456 Returns: the fopened FILE or NULL
460 modefopen(const uschar *filename, const char *options, mode_t mode)
462 mode_t saved_umask = umask(0777);
463 FILE *f = Ufopen(filename, options);
464 (void)umask(saved_umask);
465 if (f != NULL) (void)fchmod(fileno(f), mode);
472 /*************************************************
473 * Ensure stdin, stdout, and stderr exist *
474 *************************************************/
476 /* Some operating systems grumble if an exec() happens without a standard
477 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
478 file will be opened and will use these fd values, and then some other bit of
479 code will assume, for example, that it can write error messages to stderr.
480 This function ensures that fds 0, 1, and 2 are open if they do not already
481 exist, by connecting them to /dev/null.
483 This function is also used to ensure that std{in,out,err} exist at all times,
484 so that if any library that Exim calls tries to use them, it doesn't crash.
496 for (i = 0; i <= 2; i++)
498 if (fstat(i, &statbuf) < 0 && errno == EBADF)
500 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
501 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
502 string_open_failed(errno, "/dev/null"));
503 if (devnull != i) (void)dup2(devnull, i);
506 if (devnull > 2) (void)close(devnull);
512 /*************************************************
513 * Close unwanted file descriptors for delivery *
514 *************************************************/
516 /* This function is called from a new process that has been forked to deliver
517 an incoming message, either directly, or using exec.
519 We want any smtp input streams to be closed in this new process. However, it
520 has been observed that using fclose() here causes trouble. When reading in -bS
521 input, duplicate copies of messages have been seen. The files will be sharing a
522 file pointer with the parent process, and it seems that fclose() (at least on
523 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
524 least sometimes. Hence we go for closing the underlying file descriptors.
526 If TLS is active, we want to shut down the TLS library, but without molesting
527 the parent's SSL connection.
529 For delivery of a non-SMTP message, we want to close stdin and stdout (and
530 stderr unless debugging) because the calling process might have set them up as
531 pipes and be waiting for them to close before it waits for the submission
532 process to terminate. If they aren't closed, they hold up the calling process
533 until the initial delivery process finishes, which is not what we want.
535 Exception: We do want it for synchronous delivery!
537 And notwithstanding all the above, if D_resolver is set, implying resolver
538 debugging, leave stdout open, because that's where the resolver writes its
541 When we close stderr (which implies we've also closed stdout), we also get rid
542 of any controlling terminal.
554 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
556 (void)close(fileno(smtp_in));
557 (void)close(fileno(smtp_out));
562 (void)close(0); /* stdin */
563 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
564 if (debug_selector == 0) /* stderr */
566 if (!f.synchronous_delivery)
579 /*************************************************
581 *************************************************/
583 /* This function sets a new uid and gid permanently, optionally calling
584 initgroups() to set auxiliary groups. There are some special cases when running
585 Exim in unprivileged modes. In these situations the effective uid will not be
586 root; if we already have the right effective uid/gid, and don't need to
587 initialize any groups, leave things as they are.
592 igflag TRUE if initgroups() wanted
593 msg text to use in debugging output and failure log
595 Returns: nothing; bombs out on failure
599 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
601 uid_t euid = geteuid();
602 gid_t egid = getegid();
604 if (euid == root_uid || euid != uid || egid != gid || igflag)
606 /* At least one OS returns +1 for initgroups failure, so just check for
611 struct passwd *pw = getpwuid(uid);
613 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
614 "no passwd entry for uid=%ld", (long int)uid);
616 if (initgroups(pw->pw_name, gid) != 0)
617 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
618 (long int)uid, strerror(errno));
621 if (setgid(gid) < 0 || setuid(uid) < 0)
622 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
623 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
626 /* Debugging output included uid/gid and all groups */
630 int group_count, save_errno;
631 gid_t group_list[EXIM_GROUPLIST_SIZE];
632 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
633 (long int)geteuid(), (long int)getegid(), (long int)getpid());
634 group_count = getgroups(nelem(group_list), group_list);
636 debug_printf(" auxiliary group list:");
640 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
642 else if (group_count < 0)
643 debug_printf(" <error: %s>", strerror(save_errno));
644 else debug_printf(" <none>");
652 /*************************************************
654 *************************************************/
656 /* Exim exits via this function so that it always clears up any open
662 Returns: does not return
666 exim_exit(int rc, const uschar * process)
670 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
671 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
672 process ? "(" : "", process, process ? ") " : "", rc);
678 /* Print error string, then die */
680 exim_fail(const char * fmt, ...)
684 vfprintf(stderr, fmt, ap);
690 /*************************************************
691 * Extract port from host address *
692 *************************************************/
694 /* Called to extract the port from the values given to -oMa and -oMi.
695 It also checks the syntax of the address, and terminates it before the
696 port data when a port is extracted.
699 address the address, with possible port on the end
701 Returns: the port, or zero if there isn't one
702 bombs out on a syntax error
706 check_port(uschar *address)
708 int port = host_address_extract_port(address);
709 if (string_is_ip_address(address, NULL) == 0)
710 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
716 /*************************************************
717 * Test/verify an address *
718 *************************************************/
720 /* This function is called by the -bv and -bt code. It extracts a working
721 address from a full RFC 822 address. This isn't really necessary per se, but it
722 has the effect of collapsing source routes.
726 flags flag bits for verify_address()
727 exit_value to be set for failures
733 test_address(uschar *s, int flags, int *exit_value)
735 int start, end, domain;
736 uschar *parse_error = NULL;
737 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
741 fprintf(stdout, "syntax error: %s\n", parse_error);
746 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
747 -1, -1, NULL, NULL, NULL);
748 if (rc == FAIL) *exit_value = 2;
749 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
755 /*************************************************
756 * Show supported features *
757 *************************************************/
760 show_db_version(FILE * f)
762 #ifdef DB_VERSION_STRING
765 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
766 fprintf(f, " Runtime: %s\n",
767 db_version(NULL, NULL, NULL));
770 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
772 #elif defined(BTREEVERSION) && defined(HASHVERSION)
774 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
776 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
779 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
780 fprintf(f, "Probably ndbm\n");
781 #elif defined(USE_TDB)
782 fprintf(f, "Using tdb\n");
785 fprintf(f, "Probably GDBM (native mode)\n");
787 fprintf(f, "Probably GDBM (compatibility mode)\n");
793 /* This function is called for -bV/--version and for -d to output the optional
794 features of the current Exim binary.
796 Arguments: a FILE for printing
801 show_whats_supported(FILE * fp)
805 DEBUG(D_any) {} else show_db_version(fp);
807 fprintf(fp, "Support for:");
808 #ifdef SUPPORT_CRYPTEQ
809 fprintf(fp, " crypteq");
812 fprintf(fp, " iconv()");
815 fprintf(fp, " IPv6");
817 #ifdef HAVE_SETCLASSRESOURCES
818 fprintf(fp, " use_setclassresources");
824 fprintf(fp, " Perl");
827 fprintf(fp, " Expand_dlfunc");
829 #ifdef USE_TCP_WRAPPERS
830 fprintf(fp, " TCPwrappers");
834 fprintf(fp, " GnuTLS");
836 fprintf(fp, " OpenSSL");
839 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
840 fprintf(fp, " translate_ip_address");
842 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
843 fprintf(fp, " move_frozen_messages");
845 #ifdef WITH_CONTENT_SCAN
846 fprintf(fp, " Content_Scanning");
849 fprintf(fp, " DANE");
852 fprintf(fp, " DKIM");
854 #ifndef DISABLE_DNSSEC
855 fprintf(fp, " DNSSEC");
857 #ifndef DISABLE_EVENT
858 fprintf(fp, " Event");
861 fprintf(fp, " I18N");
864 fprintf(fp, " OCSP");
867 fprintf(fp, " PRDR");
870 fprintf(fp, " PROXY");
873 fprintf(fp, " SOCKS");
880 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
882 #ifdef EXPERIMENTAL_LMDB
883 fprintf(fp, " Experimental_LMDB");
885 #ifdef EXPERIMENTAL_QUEUEFILE
886 fprintf(fp, " Experimental_QUEUEFILE");
888 #ifdef EXPERIMENTAL_SRS
889 fprintf(fp, " Experimental_SRS");
891 #ifdef EXPERIMENTAL_ARC
892 fprintf(fp, " Experimental_ARC");
894 #ifdef EXPERIMENTAL_BRIGHTMAIL
895 fprintf(fp, " Experimental_Brightmail");
897 #ifdef EXPERIMENTAL_DCC
898 fprintf(fp, " Experimental_DCC");
900 #ifdef EXPERIMENTAL_DMARC
901 fprintf(fp, " Experimental_DMARC");
903 #ifdef EXPERIMENTAL_DSN_INFO
904 fprintf(fp, " Experimental_DSN_info");
906 #ifdef EXPERIMENTAL_REQUIRETLS
907 fprintf(fp, " Experimental_REQUIRETLS");
909 #ifdef EXPERIMENTAL_PIPE_CONNECT
910 fprintf(fp, " Experimental_PIPE_CONNECT");
914 fprintf(fp, "Lookups (built-in):");
915 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
916 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
918 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
921 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
922 fprintf(fp, " dbm dbmjz dbmnz");
924 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
925 fprintf(fp, " dnsdb");
927 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
928 fprintf(fp, " dsearch");
930 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
931 fprintf(fp, " ibase");
933 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
934 fprintf(fp, " ldap ldapdn ldapm");
936 #ifdef EXPERIMENTAL_LMDB
937 fprintf(fp, " lmdb");
939 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
940 fprintf(fp, " mysql");
942 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
943 fprintf(fp, " nis nis0");
945 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
946 fprintf(fp, " nisplus");
948 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
949 fprintf(fp, " oracle");
951 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
952 fprintf(fp, " passwd");
954 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
955 fprintf(fp, " pgsql");
957 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
958 fprintf(fp, " redis");
960 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
961 fprintf(fp, " sqlite");
963 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
964 fprintf(fp, " testdb");
966 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
967 fprintf(fp, " whoson");
971 auth_show_supported(fp);
972 route_show_supported(fp);
973 transport_show_supported(fp);
975 #ifdef WITH_CONTENT_SCAN
976 malware_show_supported(fp);
979 if (fixed_never_users[0] > 0)
982 fprintf(fp, "Fixed never_users: ");
983 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
984 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
985 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
988 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
990 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
992 /* Everything else is details which are only worth reporting when debugging.
993 Perhaps the tls_version_report should move into this too. */
998 /* clang defines __GNUC__ (at least, for me) so test for it first */
999 #if defined(__clang__)
1000 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1001 #elif defined(__GNUC__)
1002 fprintf(fp, "Compiler: GCC [%s]\n",
1006 "? unknown version ?"
1010 fprintf(fp, "Compiler: <unknown>\n");
1013 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1014 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1015 __GLIBC__, __GLIBC_MINOR__);
1016 if (__GLIBC_PREREQ(2, 1))
1017 fprintf(fp, " Runtime: %s\n",
1018 gnu_get_libc_version());
1021 show_db_version(fp);
1024 tls_version_report(fp);
1027 utf8_version_report(fp);
1030 for (authi = auths_available; *authi->driver_name != '\0'; ++authi)
1031 if (authi->version_report)
1032 (*authi->version_report)(fp);
1034 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1035 characters; unless it's an ancient version of PCRE in which case it
1037 #ifndef PCRE_PRERELEASE
1038 # define PCRE_PRERELEASE
1041 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1042 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1044 PCRE_MAJOR, PCRE_MINOR,
1045 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1048 #undef EXPAND_AND_QUOTE
1051 for (i = 0; i < lookup_list_count; i++)
1052 if (lookup_list[i]->version_report)
1053 lookup_list[i]->version_report(fp);
1055 #ifdef WHITELIST_D_MACROS
1056 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1058 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1060 #ifdef TRUSTED_CONFIG_LIST
1061 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1063 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1070 /*************************************************
1071 * Show auxiliary information about Exim *
1072 *************************************************/
1075 show_exim_information(enum commandline_info request, FILE *stream)
1082 fprintf(stream, "Oops, something went wrong.\n");
1086 "The -bI: flag takes a string indicating which information to provide.\n"
1087 "If the string is not recognised, you'll get this help (on stderr).\n"
1089 " exim -bI:help this information\n"
1090 " exim -bI:dscp list of known dscp value keywords\n"
1091 " exim -bI:sieve list of supported sieve extensions\n"
1095 for (pp = exim_sieve_extension_list; *pp; ++pp)
1096 fprintf(stream, "%s\n", *pp);
1099 dscp_list_to_stream(stream);
1105 /*************************************************
1106 * Quote a local part *
1107 *************************************************/
1109 /* This function is used when a sender address or a From: or Sender: header
1110 line is being created from the caller's login, or from an authenticated_id. It
1111 applies appropriate quoting rules for a local part.
1113 Argument: the local part
1114 Returns: the local part, quoted if necessary
1118 local_part_quote(uschar *lpart)
1120 BOOL needs_quote = FALSE;
1124 for (t = lpart; !needs_quote && *t != 0; t++)
1126 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1127 (*t != '.' || t == lpart || t[1] == 0);
1130 if (!needs_quote) return lpart;
1132 g = string_catn(NULL, US"\"", 1);
1136 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1139 g = string_cat(g, lpart);
1142 g = string_catn(g, lpart, nq - lpart);
1143 g = string_catn(g, US"\\", 1);
1144 g = string_catn(g, nq, 1);
1148 g = string_catn(g, US"\"", 1);
1149 return string_from_gstring(g);
1155 /*************************************************
1156 * Load readline() functions *
1157 *************************************************/
1159 /* This function is called from testing executions that read data from stdin,
1160 but only when running as the calling user. Currently, only -be does this. The
1161 function loads the readline() function library and passes back the functions.
1162 On some systems, it needs the curses library, so load that too, but try without
1163 it if loading fails. All this functionality has to be requested at build time.
1166 fn_readline_ptr pointer to where to put the readline pointer
1167 fn_addhist_ptr pointer to where to put the addhistory function
1169 Returns: the dlopen handle or NULL on failure
1173 set_readline(char * (**fn_readline_ptr)(const char *),
1174 void (**fn_addhist_ptr)(const char *))
1177 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1179 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1180 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1182 if (dlhandle != NULL)
1184 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1185 * char * readline (const char *prompt);
1186 * void add_history (const char *string);
1188 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1189 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1193 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1202 /*************************************************
1203 * Get a line from stdin for testing things *
1204 *************************************************/
1206 /* This function is called when running tests that can take a number of lines
1207 of input (for example, -be and -bt). It handles continuations and trailing
1208 spaces. And prompting and a blank line output on eof. If readline() is in use,
1209 the arguments are non-NULL and provide the relevant functions.
1212 fn_readline readline function or NULL
1213 fn_addhist addhist function or NULL
1215 Returns: pointer to dynamic memory, or NULL at end of file
1219 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1224 if (!fn_readline) { printf("> "); fflush(stdout); }
1228 uschar buffer[1024];
1232 char *readline_line = NULL;
1233 if (fn_readline != NULL)
1235 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1236 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1237 p = US readline_line;
1242 /* readline() not in use */
1245 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1249 /* Handle the line */
1251 ss = p + (int)Ustrlen(p);
1252 while (ss > p && isspace(ss[-1])) ss--;
1256 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1259 g = string_catn(g, p, ss - p);
1262 if (fn_readline) free(readline_line);
1265 /* g can only be NULL if ss==p */
1266 if (ss == p || g->s[g->ptr-1] != '\\')
1270 (void) string_from_gstring(g);
1273 if (!g) printf("\n");
1274 return string_from_gstring(g);
1279 /*************************************************
1280 * Output usage information for the program *
1281 *************************************************/
1283 /* This function is called when there are no recipients
1284 or a specific --help argument was added.
1287 progname information on what name we were called by
1289 Returns: DOES NOT RETURN
1293 exim_usage(uschar *progname)
1296 /* Handle specific program invocation variants */
1297 if (Ustrcmp(progname, US"-mailq") == 0)
1299 "mailq - list the contents of the mail queue\n\n"
1300 "For a list of options, see the Exim documentation.\n");
1302 /* Generic usage - we output this whatever happens */
1304 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1305 "not directly from a shell command line. Options and/or arguments control\n"
1306 "what it does when called. For a list of options, see the Exim documentation.\n");
1311 /*************************************************
1312 * Validate that the macros given are okay *
1313 *************************************************/
1315 /* Typically, Exim will drop privileges if macros are supplied. In some
1316 cases, we want to not do so.
1318 Arguments: opt_D_used - true if the commandline had a "-D" option
1319 Returns: true if trusted, false otherwise
1323 macros_trusted(BOOL opt_D_used)
1325 #ifdef WHITELIST_D_MACROS
1327 uschar *whitelisted, *end, *p, **whites, **w;
1328 int white_count, i, n;
1330 BOOL prev_char_item, found;
1335 #ifndef WHITELIST_D_MACROS
1339 /* We only trust -D overrides for some invoking users:
1340 root, the exim run-time user, the optional config owner user.
1341 I don't know why config-owner would be needed, but since they can own the
1342 config files anyway, there's no security risk to letting them override -D. */
1343 if ( ! ((real_uid == root_uid)
1344 || (real_uid == exim_uid)
1345 #ifdef CONFIGURE_OWNER
1346 || (real_uid == config_uid)
1350 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1354 /* Get a list of macros which are whitelisted */
1355 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1356 prev_char_item = FALSE;
1358 for (p = whitelisted; *p != '\0'; ++p)
1360 if (*p == ':' || isspace(*p))
1365 prev_char_item = FALSE;
1368 if (!prev_char_item)
1369 prev_char_item = TRUE;
1376 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1377 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1382 if (i == white_count)
1384 while (*p != '\0' && p < end)
1390 /* The list of commandline macros should be very short.
1391 Accept the N*M complexity. */
1392 for (m = macros_user; m; m = m->next) if (m->command_line)
1395 for (w = whites; *w; ++w)
1396 if (Ustrcmp(*w, m->name) == 0)
1403 if (!m->replacement)
1405 if ((len = m->replen) == 0)
1407 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1408 0, PCRE_EOPT, NULL, 0);
1411 if (n != PCRE_ERROR_NOMATCH)
1412 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1416 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1422 /*************************************************
1423 * Expansion testing *
1424 *************************************************/
1426 /* Expand and print one item, doing macro-processing.
1429 item line for expansion
1433 expansion_test_line(uschar * line)
1438 Ustrncpy(big_buffer, line, big_buffer_size);
1439 big_buffer[big_buffer_size-1] = '\0';
1440 len = Ustrlen(big_buffer);
1442 (void) macros_expand(0, &len, &dummy_macexp);
1444 if (isupper(big_buffer[0]))
1446 if (macro_read_assignment(big_buffer))
1447 printf("Defined macro '%s'\n", mlast->name);
1450 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1451 else printf("Failed: %s\n", expand_string_message);
1456 /*************************************************
1457 * Entry point and high-level code *
1458 *************************************************/
1460 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1461 the appropriate action. All the necessary functions are present in the one
1462 binary. I originally thought one should split it up, but it turns out that so
1463 much of the apparatus is needed in each chunk that one might as well just have
1464 it all available all the time, which then makes the coding easier as well.
1467 argc count of entries in argv
1468 argv argument strings, with argv[0] being the program name
1470 Returns: EXIT_SUCCESS if terminated successfully
1471 EXIT_FAILURE otherwise, except when a message has been sent
1472 to the sender, and -oee was given
1476 main(int argc, char **cargv)
1478 uschar **argv = USS cargv;
1479 int arg_receive_timeout = -1;
1480 int arg_smtp_receive_timeout = -1;
1481 int arg_error_handling = error_handling;
1482 int filter_sfd = -1;
1483 int filter_ufd = -1;
1486 int list_queue_option = 0;
1488 int msg_action_arg = -1;
1489 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1490 int queue_only_reason = 0;
1492 int perl_start_option = 0;
1494 int recipients_arg = argc;
1495 int sender_address_domain = 0;
1496 int test_retry_arg = -1;
1497 int test_rewrite_arg = -1;
1498 gid_t original_egid;
1499 BOOL arg_queue_only = FALSE;
1500 BOOL bi_option = FALSE;
1501 BOOL checking = FALSE;
1502 BOOL count_queue = FALSE;
1503 BOOL expansion_test = FALSE;
1504 BOOL extract_recipients = FALSE;
1505 BOOL flag_G = FALSE;
1506 BOOL flag_n = FALSE;
1507 BOOL forced_delivery = FALSE;
1508 BOOL f_end_dot = FALSE;
1509 BOOL deliver_give_up = FALSE;
1510 BOOL list_queue = FALSE;
1511 BOOL list_options = FALSE;
1512 BOOL list_config = FALSE;
1513 BOOL local_queue_only;
1515 BOOL one_msg_action = FALSE;
1516 BOOL opt_D_used = FALSE;
1517 BOOL queue_only_set = FALSE;
1518 BOOL receiving_message = TRUE;
1519 BOOL sender_ident_set = FALSE;
1520 BOOL session_local_queue_only;
1522 BOOL removed_privilege = FALSE;
1523 BOOL usage_wanted = FALSE;
1524 BOOL verify_address_mode = FALSE;
1525 BOOL verify_as_sender = FALSE;
1526 BOOL version_printed = FALSE;
1527 uschar *alias_arg = NULL;
1528 uschar *called_as = US"";
1529 uschar *cmdline_syslog_name = NULL;
1530 uschar *start_queue_run_id = NULL;
1531 uschar *stop_queue_run_id = NULL;
1532 uschar *expansion_test_message = NULL;
1533 uschar *ftest_domain = NULL;
1534 uschar *ftest_localpart = NULL;
1535 uschar *ftest_prefix = NULL;
1536 uschar *ftest_suffix = NULL;
1537 uschar *log_oneline = NULL;
1538 uschar *malware_test_file = NULL;
1539 uschar *real_sender_address;
1540 uschar *originator_home = US"/";
1545 struct stat statbuf;
1546 pid_t passed_qr_pid = (pid_t)0;
1547 int passed_qr_pipe = -1;
1548 gid_t group_list[EXIM_GROUPLIST_SIZE];
1550 /* For the -bI: flag */
1551 enum commandline_info info_flag = CMDINFO_NONE;
1552 BOOL info_stdout = FALSE;
1554 /* Possible options for -R and -S */
1556 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1558 /* Need to define this in case we need to change the environment in order
1559 to get rid of a bogus time zone. We have to make it char rather than uschar
1560 because some OS define it in /usr/include/unistd.h. */
1562 extern char **environ;
1564 /* If the Exim user and/or group and/or the configuration file owner/group were
1565 defined by ref:name at build time, we must now find the actual uid/gid values.
1566 This is a feature to make the lives of binary distributors easier. */
1568 #ifdef EXIM_USERNAME
1569 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1572 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1574 /* If ref:name uses a number as the name, route_finduser() returns
1575 TRUE with exim_uid set and pw coerced to NULL. */
1577 exim_gid = pw->pw_gid;
1578 #ifndef EXIM_GROUPNAME
1581 "exim: ref:name should specify a usercode, not a group.\n"
1582 "exim: can't let you get away with it unless you also specify a group.\n");
1586 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1589 #ifdef EXIM_GROUPNAME
1590 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1591 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1594 #ifdef CONFIGURE_OWNERNAME
1595 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1596 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1597 CONFIGURE_OWNERNAME);
1600 /* We default the system_filter_user to be the Exim run-time user, as a
1601 sane non-root value. */
1602 system_filter_uid = exim_uid;
1604 #ifdef CONFIGURE_GROUPNAME
1605 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1606 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1607 CONFIGURE_GROUPNAME);
1610 /* In the Cygwin environment, some initialization used to need doing.
1611 It was fudged in by means of this macro; now no longer but we'll leave
1612 it in case of others. */
1618 /* Check a field which is patched when we are running Exim within its
1619 testing harness; do a fast initial check, and then the whole thing. */
1621 f.running_in_test_harness =
1622 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1623 if (f.running_in_test_harness)
1626 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1627 at the start of a program; however, it seems that some environments do not
1628 follow this. A "strange" locale can affect the formatting of timestamps, so we
1631 setlocale(LC_ALL, "C");
1633 /* Set up the default handler for timing using alarm(). */
1635 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1637 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1638 because store_malloc writes a log entry on failure. */
1640 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1641 exim_fail("exim: failed to get store for log buffer\n");
1643 /* Initialize the default log options. */
1645 bits_set(log_selector, log_selector_size, log_default);
1647 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1648 NULL when the daemon is run and the file is closed. We have to use this
1649 indirection, because some systems don't allow writing to the variable "stderr".
1652 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1654 /* Arrange for the PCRE regex library to use our store functions. Note that
1655 the normal calls are actually macros that add additional arguments for
1656 debugging purposes so we have to assign specially constructed functions here.
1657 The default is to use store in the stacking pool, but this is overridden in the
1658 regex_must_compile() function. */
1660 pcre_malloc = function_store_get;
1661 pcre_free = function_dummy_free;
1663 /* Ensure there is a big buffer for temporary use in several places. It is put
1664 in malloc store so that it can be freed for enlargement if necessary. */
1666 big_buffer = store_malloc(big_buffer_size);
1668 /* Set up the handler for the data request signal, and set the initial
1669 descriptive text. */
1671 set_process_info("initializing");
1672 os_restarting_signal(SIGUSR1, usr1_handler);
1674 /* If running in a dockerized environment, the TERM signal is only
1675 delegated to the PID 1 if we request it by setting an signal handler */
1676 if (getpid() == 1) signal(SIGTERM, term_handler);
1678 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1679 in the daemon code. For the rest of Exim's uses, we ignore it. */
1681 signal(SIGHUP, SIG_IGN);
1683 /* We don't want to die on pipe errors as the code is written to handle
1684 the write error instead. */
1686 signal(SIGPIPE, SIG_IGN);
1688 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1689 set to SIG_IGN. This causes subprocesses that complete before the parent
1690 process waits for them not to hang around, so when Exim calls wait(), nothing
1691 is there. The wait() code has been made robust against this, but let's ensure
1692 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1693 ending status. We use sigaction rather than plain signal() on those OS where
1694 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1695 problem on AIX with this.) */
1699 struct sigaction act;
1700 act.sa_handler = SIG_DFL;
1701 sigemptyset(&(act.sa_mask));
1703 sigaction(SIGCHLD, &act, NULL);
1706 signal(SIGCHLD, SIG_DFL);
1709 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1714 /* Set up the version number. Set up the leading 'E' for the external form of
1715 message ids, set the pointer to the internal form, and initialize it to
1716 indicate no message being processed. */
1719 message_id_option[0] = '-';
1720 message_id_external = message_id_option + 1;
1721 message_id_external[0] = 'E';
1722 message_id = message_id_external + 1;
1725 /* Set the umask to zero so that any files Exim creates using open() are
1726 created with the modes that it specifies. NOTE: Files created with fopen() have
1727 a problem, which was not recognized till rather late (February 2006). With this
1728 umask, such files will be world writeable. (They are all content scanning files
1729 in the spool directory, which isn't world-accessible, so this is not a
1730 disaster, but it's untidy.) I don't want to change this overall setting,
1731 however, because it will interact badly with the open() calls. Instead, there's
1732 now a function called modefopen() that fiddles with the umask while calling
1737 /* Precompile the regular expression for matching a message id. Keep this in
1738 step with the code that generates ids in the accept.c module. We need to do
1739 this here, because the -M options check their arguments for syntactic validity
1740 using mac_ismsgid, which uses this. */
1743 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1745 /* Precompile the regular expression that is used for matching an SMTP error
1746 code, possibly extended, at the start of an error message. Note that the
1747 terminating whitespace character is included. */
1750 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1753 #ifdef WHITELIST_D_MACROS
1754 /* Precompile the regular expression used to filter the content of macros
1755 given to -D for permissibility. */
1757 regex_whitelisted_macro =
1758 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1761 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1763 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1764 this seems to be a generally accepted convention, since one finds symbolic
1765 links called "mailq" in standard OS configurations. */
1767 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1768 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1771 receiving_message = FALSE;
1772 called_as = US"-mailq";
1775 /* If the program is called as "rmail" treat it as equivalent to
1776 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1777 i.e. preventing a single dot on a line from terminating the message, and
1778 returning with zero return code, even in cases of error (provided an error
1779 message has been sent). */
1781 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1782 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1785 called_as = US"-rmail";
1786 errors_sender_rc = EXIT_SUCCESS;
1789 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1790 this is a smail convention. */
1792 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1793 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1795 smtp_input = smtp_batched_input = TRUE;
1796 called_as = US"-rsmtp";
1799 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1800 this is a smail convention. */
1802 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1803 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1806 receiving_message = FALSE;
1807 called_as = US"-runq";
1810 /* If the program is called as "newaliases" treat it as equivalent to
1811 "exim -bi"; this is a sendmail convention. */
1813 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1814 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1817 receiving_message = FALSE;
1818 called_as = US"-newaliases";
1821 /* Save the original effective uid for a couple of uses later. It should
1822 normally be root, but in some esoteric environments it may not be. */
1824 original_euid = geteuid();
1825 original_egid = getegid();
1827 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1828 to be the same as the real ones. This makes a difference only if Exim is setuid
1829 (or setgid) to something other than root, which could be the case in some
1830 special configurations. */
1832 real_uid = getuid();
1833 real_gid = getgid();
1835 if (real_uid == root_uid)
1837 if ((rv = setgid(real_gid)))
1838 exim_fail("exim: setgid(%ld) failed: %s\n",
1839 (long int)real_gid, strerror(errno));
1840 if ((rv = setuid(real_uid)))
1841 exim_fail("exim: setuid(%ld) failed: %s\n",
1842 (long int)real_uid, strerror(errno));
1845 /* If neither the original real uid nor the original euid was root, Exim is
1846 running in an unprivileged state. */
1848 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1850 /* Scan the program's arguments. Some can be dealt with right away; others are
1851 simply recorded for checking and handling afterwards. Do a high-level switch
1852 on the second character (the one after '-'), to save some effort. */
1854 for (i = 1; i < argc; i++)
1856 BOOL badarg = FALSE;
1857 uschar *arg = argv[i];
1861 /* An argument not starting with '-' is the start of a recipients list;
1862 break out of the options-scanning loop. */
1870 /* An option consisting of -- terminates the options */
1872 if (Ustrcmp(arg, "--") == 0)
1874 recipients_arg = i + 1;
1878 /* Handle flagged options */
1880 switchchar = arg[1];
1883 /* Make all -ex options synonymous with -oex arguments, since that
1884 is assumed by various callers. Also make -qR options synonymous with -R
1885 options, as that seems to be required as well. Allow for -qqR too, and
1886 the same for -S options. */
1888 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1889 Ustrncmp(arg+1, "qR", 2) == 0 ||
1890 Ustrncmp(arg+1, "qS", 2) == 0)
1892 switchchar = arg[2];
1895 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1897 switchchar = arg[3];
1899 f.queue_2stage = TRUE;
1902 /* Make -r synonymous with -f, since it is a documented alias */
1904 else if (arg[1] == 'r') switchchar = 'f';
1906 /* Make -ov synonymous with -v */
1908 else if (Ustrcmp(arg, "-ov") == 0)
1914 /* deal with --option_aliases */
1915 else if (switchchar == '-')
1917 if (Ustrcmp(argrest, "help") == 0)
1919 usage_wanted = TRUE;
1922 else if (Ustrcmp(argrest, "version") == 0)
1929 /* High-level switch on active initial letter */
1934 /* sendmail uses -Ac and -Am to control which .cf file is used;
1937 if (*argrest == '\0') { badarg = TRUE; break; }
1940 BOOL ignore = FALSE;
1945 if (*(argrest + 1) == '\0')
1949 if (!ignore) { badarg = TRUE; break; }
1953 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1954 so has no need of it. */
1957 if (*argrest == 0) i++; /* Skip over the type */
1962 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1964 /* -bd: Run in daemon mode, awaiting SMTP connections.
1965 -bdf: Ditto, but in the foreground.
1968 if (*argrest == 'd')
1970 f.daemon_listen = TRUE;
1971 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1972 else if (*argrest != 0) { badarg = TRUE; break; }
1975 /* -be: Run in expansion test mode
1976 -bem: Ditto, but read a message from a file first
1979 else if (*argrest == 'e')
1981 expansion_test = checking = TRUE;
1982 if (argrest[1] == 'm')
1984 if (++i >= argc) { badarg = TRUE; break; }
1985 expansion_test_message = argv[i];
1988 if (argrest[1] != 0) { badarg = TRUE; break; }
1991 /* -bF: Run system filter test */
1993 else if (*argrest == 'F')
1995 filter_test |= checking = FTEST_SYSTEM;
1996 if (*(++argrest) != 0) { badarg = TRUE; break; }
1997 if (++i < argc) filter_test_sfile = argv[i]; else
1998 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2001 /* -bf: Run user filter test
2002 -bfd: Set domain for filter testing
2003 -bfl: Set local part for filter testing
2004 -bfp: Set prefix for filter testing
2005 -bfs: Set suffix for filter testing
2008 else if (*argrest == 'f')
2010 if (*(++argrest) == 0)
2012 filter_test |= checking = FTEST_USER;
2013 if (++i < argc) filter_test_ufile = argv[i]; else
2014 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2019 exim_fail("exim: string expected after %s\n", arg);
2020 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2021 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2022 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2023 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2024 else { badarg = TRUE; break; }
2028 /* -bh: Host checking - an IP address must follow. */
2030 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2032 if (++i >= argc) { badarg = TRUE; break; }
2033 sender_host_address = argv[i];
2034 host_checking = checking = f.log_testing_mode = TRUE;
2035 f.host_checking_callout = argrest[1] == 'c';
2036 message_logs = FALSE;
2039 /* -bi: This option is used by sendmail to initialize *the* alias file,
2040 though it has the -oA option to specify a different file. Exim has no
2041 concept of *the* alias file, but since Sun's YP make script calls
2042 sendmail this way, some support must be provided. */
2044 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2046 /* -bI: provide information, of the type to follow after a colon.
2047 This is an Exim flag. */
2049 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2051 uschar *p = &argrest[2];
2052 info_flag = CMDINFO_HELP;
2055 if (strcmpic(p, CUS"sieve") == 0)
2057 info_flag = CMDINFO_SIEVE;
2060 else if (strcmpic(p, CUS"dscp") == 0)
2062 info_flag = CMDINFO_DSCP;
2065 else if (strcmpic(p, CUS"help") == 0)
2072 /* -bm: Accept and deliver message - the default option. Reinstate
2073 receiving_message, which got turned off for all -b options. */
2075 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2077 /* -bmalware: test the filename given for malware */
2079 else if (Ustrcmp(argrest, "malware") == 0)
2081 if (++i >= argc) { badarg = TRUE; break; }
2083 malware_test_file = argv[i];
2086 /* -bnq: For locally originating messages, do not qualify unqualified
2087 addresses. In the envelope, this causes errors; in header lines they
2090 else if (Ustrcmp(argrest, "nq") == 0)
2092 f.allow_unqualified_sender = FALSE;
2093 f.allow_unqualified_recipient = FALSE;
2096 /* -bpxx: List the contents of the mail queue, in various forms. If
2097 the option is -bpc, just a queue count is needed. Otherwise, if the
2098 first letter after p is r, then order is random. */
2100 else if (*argrest == 'p')
2102 if (*(++argrest) == 'c')
2105 if (*(++argrest) != 0) badarg = TRUE;
2109 if (*argrest == 'r')
2111 list_queue_option = 8;
2114 else list_queue_option = 0;
2118 /* -bp: List the contents of the mail queue, top-level only */
2120 if (*argrest == 0) {}
2122 /* -bpu: List the contents of the mail queue, top-level undelivered */
2124 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2126 /* -bpa: List the contents of the mail queue, including all delivered */
2128 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2130 /* Unknown after -bp[r] */
2140 /* -bP: List the configuration variables given as the address list.
2141 Force -v, so configuration errors get displayed. */
2143 else if (Ustrcmp(argrest, "P") == 0)
2145 /* -bP config: we need to setup here, because later,
2146 * when list_options is checked, the config is read already */
2147 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2150 readconf_save_config(version_string);
2154 list_options = TRUE;
2155 debug_selector |= D_v;
2156 debug_file = stderr;
2160 /* -brt: Test retry configuration lookup */
2162 else if (Ustrcmp(argrest, "rt") == 0)
2165 test_retry_arg = i + 1;
2169 /* -brw: Test rewrite configuration */
2171 else if (Ustrcmp(argrest, "rw") == 0)
2174 test_rewrite_arg = i + 1;
2178 /* -bS: Read SMTP commands on standard input, but produce no replies -
2179 all errors are reported by sending messages. */
2181 else if (Ustrcmp(argrest, "S") == 0)
2182 smtp_input = smtp_batched_input = receiving_message = TRUE;
2184 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2185 on standard output. */
2187 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2189 /* -bt: address testing mode */
2191 else if (Ustrcmp(argrest, "t") == 0)
2192 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2194 /* -bv: verify addresses */
2196 else if (Ustrcmp(argrest, "v") == 0)
2197 verify_address_mode = checking = f.log_testing_mode = TRUE;
2199 /* -bvs: verify sender addresses */
2201 else if (Ustrcmp(argrest, "vs") == 0)
2203 verify_address_mode = checking = f.log_testing_mode = TRUE;
2204 verify_as_sender = TRUE;
2207 /* -bV: Print version string and support details */
2209 else if (Ustrcmp(argrest, "V") == 0)
2211 printf("Exim version %s #%s built %s\n", version_string,
2212 version_cnumber, version_date);
2213 printf("%s\n", CS version_copyright);
2214 version_printed = TRUE;
2215 show_whats_supported(stdout);
2216 f.log_testing_mode = TRUE;
2219 /* -bw: inetd wait mode, accept a listening socket as stdin */
2221 else if (*argrest == 'w')
2223 f.inetd_wait_mode = TRUE;
2224 f.background_daemon = FALSE;
2225 f.daemon_listen = TRUE;
2226 if (*(++argrest) != '\0')
2227 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2228 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2235 /* -C: change configuration file list; ignore if it isn't really
2236 a change! Enforce a prefix check if required. */
2241 if(++i < argc) argrest = argv[i]; else
2242 { badarg = TRUE; break; }
2244 if (Ustrcmp(config_main_filelist, argrest) != 0)
2246 #ifdef ALT_CONFIG_PREFIX
2248 int len = Ustrlen(ALT_CONFIG_PREFIX);
2249 const uschar *list = argrest;
2251 while((filename = string_nextinlist(&list, &sep, big_buffer,
2252 big_buffer_size)) != NULL)
2254 if ((Ustrlen(filename) < len ||
2255 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2256 Ustrstr(filename, "/../") != NULL) &&
2257 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2258 exim_fail("-C Permission denied\n");
2261 if (real_uid != root_uid)
2263 #ifdef TRUSTED_CONFIG_LIST
2265 if (real_uid != exim_uid
2266 #ifdef CONFIGURE_OWNER
2267 && real_uid != config_uid
2270 f.trusted_config = FALSE;
2273 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2276 struct stat statbuf;
2278 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2279 (statbuf.st_uid != root_uid /* owner not root */
2280 #ifdef CONFIGURE_OWNER
2281 && statbuf.st_uid != config_uid /* owner not the special one */
2284 (statbuf.st_gid != root_gid /* group not root */
2285 #ifdef CONFIGURE_GROUP
2286 && statbuf.st_gid != config_gid /* group not the special one */
2288 && (statbuf.st_mode & 020) != 0 /* group writeable */
2290 (statbuf.st_mode & 2) != 0) /* world writeable */
2292 f.trusted_config = FALSE;
2297 /* Well, the trust list at least is up to scratch... */
2298 void *reset_point = store_get(0);
2299 uschar *trusted_configs[32];
2303 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2305 uschar *start = big_buffer, *nl;
2306 while (*start && isspace(*start))
2310 nl = Ustrchr(start, '\n');
2313 trusted_configs[nr_configs++] = string_copy(start);
2314 if (nr_configs == 32)
2322 const uschar *list = argrest;
2324 while (f.trusted_config && (filename = string_nextinlist(&list,
2325 &sep, big_buffer, big_buffer_size)) != NULL)
2327 for (i=0; i < nr_configs; i++)
2329 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2332 if (i == nr_configs)
2334 f.trusted_config = FALSE;
2338 store_reset(reset_point);
2342 /* No valid prefixes found in trust_list file. */
2343 f.trusted_config = FALSE;
2349 /* Could not open trust_list file. */
2350 f.trusted_config = FALSE;
2354 /* Not root; don't trust config */
2355 f.trusted_config = FALSE;
2359 config_main_filelist = argrest;
2360 f.config_changed = TRUE;
2365 /* -D: set up a macro definition */
2368 #ifdef DISABLE_D_OPTION
2369 exim_fail("exim: -D is not available in this Exim binary\n");
2375 uschar *s = argrest;
2378 while (isspace(*s)) s++;
2380 if (*s < 'A' || *s > 'Z')
2381 exim_fail("exim: macro name set by -D must start with "
2382 "an upper case letter\n");
2384 while (isalnum(*s) || *s == '_')
2386 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2390 if (ptr == 0) { badarg = TRUE; break; }
2391 while (isspace(*s)) s++;
2394 if (*s++ != '=') { badarg = TRUE; break; }
2395 while (isspace(*s)) s++;
2398 for (m = macros_user; m; m = m->next)
2399 if (Ustrcmp(m->name, name) == 0)
2400 exim_fail("exim: duplicated -D in command line\n");
2402 m = macro_create(name, s, TRUE);
2404 if (clmacro_count >= MAX_CLMACROS)
2405 exim_fail("exim: too many -D options on command line\n");
2406 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2412 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2413 The latter is now a no-op, retained for compatibility only. If -dd is used,
2414 debugging subprocesses of the daemon is disabled. */
2417 if (Ustrcmp(argrest, "ropcr") == 0)
2419 /* drop_cr = TRUE; */
2422 /* Use an intermediate variable so that we don't set debugging while
2423 decoding the debugging bits. */
2427 unsigned int selector = D_default;
2430 if (*argrest == 'd')
2432 f.debug_daemon = TRUE;
2436 decode_bits(&selector, 1, debug_notall, argrest,
2437 debug_options, debug_options_count, US"debug", 0);
2438 debug_selector = selector;
2443 /* -E: This is a local error message. This option is not intended for
2444 external use at all, but is not restricted to trusted callers because it
2445 does no harm (just suppresses certain error messages) and if Exim is run
2446 not setuid root it won't always be trusted when it generates error
2447 messages using this option. If there is a message id following -E, point
2448 message_reference at it, for logging. */
2451 f.local_error_message = TRUE;
2452 if (mac_ismsgid(argrest)) message_reference = argrest;
2456 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2457 option, so it looks as if historically the -oex options are also callable
2458 without the leading -o. So we have to accept them. Before the switch,
2459 anything starting -oe has been converted to -e. Exim does not support all
2460 of the sendmail error options. */
2463 if (Ustrcmp(argrest, "e") == 0)
2465 arg_error_handling = ERRORS_SENDER;
2466 errors_sender_rc = EXIT_SUCCESS;
2468 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2469 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2470 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2471 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2476 /* -F: Set sender's full name, used instead of the gecos entry from
2477 the password file. Since users can usually alter their gecos entries,
2478 there's no security involved in using this instead. The data can follow
2479 the -F or be in the next argument. */
2484 if(++i < argc) argrest = argv[i]; else
2485 { badarg = TRUE; break; }
2487 originator_name = argrest;
2488 f.sender_name_forced = TRUE;
2492 /* -f: Set sender's address - this value is only actually used if Exim is
2493 run by a trusted user, or if untrusted_set_sender is set and matches the
2494 address, except that the null address can always be set by any user. The
2495 test for this happens later, when the value given here is ignored when not
2496 permitted. For an untrusted user, the actual sender is still put in Sender:
2497 if it doesn't match the From: header (unless no_local_from_check is set).
2498 The data can follow the -f or be in the next argument. The -r switch is an
2499 obsolete form of -f but since there appear to be programs out there that
2500 use anything that sendmail has ever supported, better accept it - the
2501 synonymizing is done before the switch above.
2503 At this stage, we must allow domain literal addresses, because we don't
2504 know what the setting of allow_domain_literals is yet. Ditto for trailing
2505 dots and strip_trailing_dot. */
2509 int dummy_start, dummy_end;
2513 if (i+1 < argc) argrest = argv[++i]; else
2514 { badarg = TRUE; break; }
2517 sender_address = string_sprintf(""); /* Ensure writeable memory */
2520 uschar *temp = argrest + Ustrlen(argrest) - 1;
2521 while (temp >= argrest && isspace(*temp)) temp--;
2522 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2523 allow_domain_literals = TRUE;
2524 strip_trailing_dot = TRUE;
2526 allow_utf8_domains = TRUE;
2528 sender_address = parse_extract_address(argrest, &errmess,
2529 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2531 message_smtputf8 = string_is_utf8(sender_address);
2532 allow_utf8_domains = FALSE;
2534 allow_domain_literals = FALSE;
2535 strip_trailing_dot = FALSE;
2536 if (!sender_address)
2537 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2539 f.sender_address_forced = TRUE;
2543 /* -G: sendmail invocation to specify that it's a gateway submission and
2544 sendmail may complain about problems instead of fixing them.
2545 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2546 not at this time complain about problems. */
2552 /* -h: Set the hop count for an incoming message. Exim does not currently
2553 support this; it always computes it by counting the Received: headers.
2554 To put it in will require a change to the spool header file format. */
2559 if(++i < argc) argrest = argv[i]; else
2560 { badarg = TRUE; break; }
2562 if (!isdigit(*argrest)) badarg = TRUE;
2566 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2567 not to be documented for sendmail but mailx (at least) uses it) */
2570 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2574 /* -L: set the identifier used for syslog; equivalent to setting
2575 syslog_processname in the config file, but needs to be an admin option. */
2578 if (*argrest == '\0')
2580 if(++i < argc) argrest = argv[i]; else
2581 { badarg = TRUE; break; }
2583 if ((sz = Ustrlen(argrest)) > 32)
2584 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2586 exim_fail("exim: the -L syslog name is too short\n");
2587 cmdline_syslog_name = argrest;
2591 receiving_message = FALSE;
2593 /* -MC: continue delivery of another message via an existing open
2594 file descriptor. This option is used for an internal call by the
2595 smtp transport when there is a pending message waiting to go to an
2596 address to which it has got a connection. Five subsequent arguments are
2597 required: transport name, host name, IP address, sequence number, and
2598 message_id. Transports may decline to create new processes if the sequence
2599 number gets too big. The channel is stdin. This (-MC) must be the last
2600 argument. There's a subsequent check that the real-uid is privileged.
2602 If we are running in the test harness. delay for a bit, to let the process
2603 that set this one up complete. This makes for repeatability of the logging,
2606 if (Ustrcmp(argrest, "C") == 0)
2608 union sockaddr_46 interface_sock;
2609 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2612 exim_fail("exim: too many or too few arguments after -MC\n");
2614 if (msg_action_arg >= 0)
2615 exim_fail("exim: incompatible arguments\n");
2617 continue_transport = argv[++i];
2618 continue_hostname = argv[++i];
2619 continue_host_address = argv[++i];
2620 continue_sequence = Uatoi(argv[++i]);
2621 msg_action = MSG_DELIVER;
2622 msg_action_arg = ++i;
2623 forced_delivery = TRUE;
2624 queue_run_pid = passed_qr_pid;
2625 queue_run_pipe = passed_qr_pipe;
2627 if (!mac_ismsgid(argv[i]))
2628 exim_fail("exim: malformed message id %s after -MC option\n",
2631 /* Set up $sending_ip_address and $sending_port, unless proxied */
2633 if (!continue_proxy_cipher)
2634 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2636 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2639 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2642 if (f.running_in_test_harness) millisleep(500);
2646 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2650 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2651 precedes -MC (see above). The flag indicates that the host to which
2652 Exim is connected has accepted an AUTH sequence. */
2654 case 'A': f.smtp_authenticated = TRUE; break;
2656 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2657 that exim is connected to supports the esmtp extension DSN */
2659 case 'D': smtp_peer_options |= OPTION_DSN; break;
2661 /* -MCG: set the queue name, to a non-default value */
2663 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2667 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2669 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2671 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2672 it preceded -MC (see above) */
2674 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2676 /* -MCQ: pass on the pid of the queue-running process that started
2677 this chain of deliveries and the fd of its synchronizing pipe; this
2678 is useful only when it precedes -MC (see above) */
2680 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2682 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2686 /* -MCS: set the smtp_use_size flag; this is useful only when it
2687 precedes -MC (see above) */
2689 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2692 /* -MCt: similar to -MCT below but the connection is still open
2693 via a proxy proces which handles the TLS context and coding.
2694 Require three arguments for the proxied local address and port,
2695 and the TLS cipher. */
2697 case 't': if (++i < argc) sending_ip_address = argv[i];
2699 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2701 if (++i < argc) continue_proxy_cipher = argv[i];
2705 /* -MCT: set the tls_offered flag; this is useful only when it
2706 precedes -MC (see above). The flag indicates that the host to which
2707 Exim is connected has offered TLS support. */
2709 case 'T': smtp_peer_options |= OPTION_TLS; break;
2712 default: badarg = TRUE; break;
2717 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_REQUIRETLS)
2718 /* -MS set REQUIRETLS on (new) message */
2720 else if (*argrest == 'S')
2722 tls_requiretls |= REQUIRETLS_MSG;
2727 /* -M[x]: various operations on the following list of message ids:
2728 -M deliver the messages, ignoring next retry times and thawing
2729 -Mc deliver the messages, checking next retry times, no thawing
2730 -Mf freeze the messages
2731 -Mg give up on the messages
2732 -Mt thaw the messages
2733 -Mrm remove the messages
2734 In the above cases, this must be the last option. There are also the
2735 following options which are followed by a single message id, and which
2736 act on that message. Some of them use the "recipient" addresses as well.
2737 -Mar add recipient(s)
2738 -Mmad mark all recipients delivered
2739 -Mmd mark recipients(s) delivered
2741 -Mset load a message for use with -be
2743 -Mvc show copy (of whole message, in RFC 2822 format)
2748 else if (*argrest == 0)
2750 msg_action = MSG_DELIVER;
2751 forced_delivery = f.deliver_force_thaw = TRUE;
2753 else if (Ustrcmp(argrest, "ar") == 0)
2755 msg_action = MSG_ADD_RECIPIENT;
2756 one_msg_action = TRUE;
2758 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2759 else if (Ustrcmp(argrest, "es") == 0)
2761 msg_action = MSG_EDIT_SENDER;
2762 one_msg_action = TRUE;
2764 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2765 else if (Ustrcmp(argrest, "g") == 0)
2767 msg_action = MSG_DELIVER;
2768 deliver_give_up = TRUE;
2770 else if (Ustrcmp(argrest, "mad") == 0)
2772 msg_action = MSG_MARK_ALL_DELIVERED;
2774 else if (Ustrcmp(argrest, "md") == 0)
2776 msg_action = MSG_MARK_DELIVERED;
2777 one_msg_action = TRUE;
2779 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2780 else if (Ustrcmp(argrest, "set") == 0)
2782 msg_action = MSG_LOAD;
2783 one_msg_action = TRUE;
2785 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2786 else if (Ustrcmp(argrest, "vb") == 0)
2788 msg_action = MSG_SHOW_BODY;
2789 one_msg_action = TRUE;
2791 else if (Ustrcmp(argrest, "vc") == 0)
2793 msg_action = MSG_SHOW_COPY;
2794 one_msg_action = TRUE;
2796 else if (Ustrcmp(argrest, "vh") == 0)
2798 msg_action = MSG_SHOW_HEADER;
2799 one_msg_action = TRUE;
2801 else if (Ustrcmp(argrest, "vl") == 0)
2803 msg_action = MSG_SHOW_LOG;
2804 one_msg_action = TRUE;
2806 else { badarg = TRUE; break; }
2808 /* All the -Mxx options require at least one message id. */
2810 msg_action_arg = i + 1;
2811 if (msg_action_arg >= argc)
2812 exim_fail("exim: no message ids given after %s option\n", arg);
2814 /* Some require only message ids to follow */
2816 if (!one_msg_action)
2819 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2820 exim_fail("exim: malformed message id %s after %s option\n",
2822 goto END_ARG; /* Remaining args are ids */
2825 /* Others require only one message id, possibly followed by addresses,
2826 which will be handled as normal arguments. */
2830 if (!mac_ismsgid(argv[msg_action_arg]))
2831 exim_fail("exim: malformed message id %s after %s option\n",
2832 argv[msg_action_arg], arg);
2838 /* Some programs seem to call the -om option without the leading o;
2839 for sendmail it askes for "me too". Exim always does this. */
2842 if (*argrest != 0) badarg = TRUE;
2846 /* -N: don't do delivery - a debugging option that stops transports doing
2847 their thing. It implies debugging at the D_v level. */
2852 f.dont_deliver = TRUE;
2853 debug_selector |= D_v;
2854 debug_file = stderr;
2860 /* -n: This means "don't alias" in sendmail, apparently.
2861 For normal invocations, it has no effect.
2862 It may affect some other options. */
2868 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2869 option to the specified value. This form uses long names. We need to handle
2870 -O option=value and -Ooption=value. */
2876 exim_fail("exim: string expected after -O\n");
2882 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2885 if (*argrest == 'A')
2887 alias_arg = argrest + 1;
2888 if (alias_arg[0] == 0)
2890 if (i+1 < argc) alias_arg = argv[++i]; else
2891 exim_fail("exim: string expected after -oA\n");
2895 /* -oB: Set a connection message max value for remote deliveries */
2897 else if (*argrest == 'B')
2899 uschar *p = argrest + 1;
2902 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2904 connection_max_messages = 1;
2912 exim_fail("exim: number expected after -oB\n");
2913 connection_max_messages = Uatoi(p);
2917 /* -odb: background delivery */
2919 else if (Ustrcmp(argrest, "db") == 0)
2921 f.synchronous_delivery = FALSE;
2922 arg_queue_only = FALSE;
2923 queue_only_set = TRUE;
2926 /* -odf: foreground delivery (smail-compatible option); same effect as
2927 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2930 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2932 f.synchronous_delivery = TRUE;
2933 arg_queue_only = FALSE;
2934 queue_only_set = TRUE;
2937 /* -odq: queue only */
2939 else if (Ustrcmp(argrest, "dq") == 0)
2941 f.synchronous_delivery = FALSE;
2942 arg_queue_only = TRUE;
2943 queue_only_set = TRUE;
2946 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2947 but no remote delivery */
2949 else if (Ustrcmp(argrest, "dqs") == 0)
2951 f.queue_smtp = TRUE;
2952 arg_queue_only = FALSE;
2953 queue_only_set = TRUE;
2956 /* -oex: Sendmail error flags. As these are also accepted without the
2957 leading -o prefix, for compatibility with vacation and other callers,
2958 they are handled with -e above. */
2960 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2961 -oitrue: Another sendmail syntax for the same */
2963 else if (Ustrcmp(argrest, "i") == 0 ||
2964 Ustrcmp(argrest, "itrue") == 0)
2967 /* -oM*: Set various characteristics for an incoming message; actually
2968 acted on for trusted callers only. */
2970 else if (*argrest == 'M')
2973 exim_fail("exim: data expected after -o%s\n", argrest);
2975 /* -oMa: Set sender host address */
2977 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2979 /* -oMaa: Set authenticator name */
2981 else if (Ustrcmp(argrest, "Maa") == 0)
2982 sender_host_authenticated = argv[++i];
2984 /* -oMas: setting authenticated sender */
2986 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2988 /* -oMai: setting authenticated id */
2990 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2992 /* -oMi: Set incoming interface address */
2994 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2996 /* -oMm: Message reference */
2998 else if (Ustrcmp(argrest, "Mm") == 0)
3000 if (!mac_ismsgid(argv[i+1]))
3001 exim_fail("-oMm must be a valid message ID\n");
3002 if (!f.trusted_config)
3003 exim_fail("-oMm must be called by a trusted user/config\n");
3004 message_reference = argv[++i];
3007 /* -oMr: Received protocol */
3009 else if (Ustrcmp(argrest, "Mr") == 0)
3011 if (received_protocol)
3012 exim_fail("received_protocol is set already\n");
3014 received_protocol = argv[++i];
3016 /* -oMs: Set sender host name */
3018 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3020 /* -oMt: Set sender ident */
3022 else if (Ustrcmp(argrest, "Mt") == 0)
3024 sender_ident_set = TRUE;
3025 sender_ident = argv[++i];
3028 /* Else a bad argument */
3037 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3038 seem to call this as -m (undocumented), so that is also accepted (see
3041 else if (Ustrcmp(argrest, "m") == 0) {}
3043 /* -oo: An ancient flag for old-style addresses which still seems to
3044 crop up in some calls (see in SCO). */
3046 else if (Ustrcmp(argrest, "o") == 0) {}
3048 /* -oP <name>: set pid file path for daemon */
3050 else if (Ustrcmp(argrest, "P") == 0)
3051 override_pid_file_path = argv[++i];
3053 /* -or <n>: set timeout for non-SMTP acceptance
3054 -os <n>: set timeout for SMTP acceptance */
3056 else if (*argrest == 'r' || *argrest == 's')
3058 int *tp = (*argrest == 'r')?
3059 &arg_receive_timeout : &arg_smtp_receive_timeout;
3060 if (argrest[1] == 0)
3062 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3064 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3066 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3069 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3071 else if (Ustrcmp(argrest, "X") == 0)
3072 override_local_interfaces = argv[++i];
3074 /* Unknown -o argument */
3080 /* -ps: force Perl startup; -pd force delayed Perl startup */
3084 if (*argrest == 's' && argrest[1] == 0)
3086 perl_start_option = 1;
3089 if (*argrest == 'd' && argrest[1] == 0)
3091 perl_start_option = -1;
3096 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3097 which sets the host protocol and host name */
3101 argrest = argv[++i];
3103 { badarg = TRUE; break; }
3109 if (received_protocol)
3110 exim_fail("received_protocol is set already\n");
3112 hn = Ustrchr(argrest, ':');
3114 received_protocol = argrest;
3117 int old_pool = store_pool;
3118 store_pool = POOL_PERM;
3119 received_protocol = string_copyn(argrest, hn - argrest);
3120 store_pool = old_pool;
3121 sender_host_name = hn + 1;
3128 receiving_message = FALSE;
3129 if (queue_interval >= 0)
3130 exim_fail("exim: -q specified more than once\n");
3132 /* -qq...: Do queue runs in a 2-stage manner */
3134 if (*argrest == 'q')
3136 f.queue_2stage = TRUE;
3140 /* -qi...: Do only first (initial) deliveries */
3142 if (*argrest == 'i')
3144 f.queue_run_first_delivery = TRUE;
3148 /* -qf...: Run the queue, forcing deliveries
3149 -qff..: Ditto, forcing thawing as well */
3151 if (*argrest == 'f')
3153 f.queue_run_force = TRUE;
3154 if (*++argrest == 'f')
3156 f.deliver_force_thaw = TRUE;
3161 /* -q[f][f]l...: Run the queue only on local deliveries */
3163 if (*argrest == 'l')
3165 f.queue_run_local = TRUE;
3169 /* -q[f][f][l][G<name>]... Work on the named queue */
3171 if (*argrest == 'G')
3174 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3175 queue_name = string_copyn(argrest, i);
3177 if (*argrest == '/') argrest++;
3180 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3181 only, optionally named, optionally starting from a given message id. */
3183 if (*argrest == 0 &&
3184 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3187 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3188 start_queue_run_id = argv[++i];
3189 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3190 stop_queue_run_id = argv[++i];
3193 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3194 forced, optionally local only, optionally named. */
3196 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3198 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3202 case 'R': /* Synonymous with -qR... */
3203 receiving_message = FALSE;
3205 /* -Rf: As -R (below) but force all deliveries,
3206 -Rff: Ditto, but also thaw all frozen messages,
3207 -Rr: String is regex
3208 -Rrf: Regex and force
3209 -Rrff: Regex and force and thaw
3211 in all cases provided there are no further characters in this
3217 for (i = 0; i < nelem(rsopts); i++)
3218 if (Ustrcmp(argrest, rsopts[i]) == 0)
3220 if (i != 2) f.queue_run_force = TRUE;
3221 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3222 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3223 argrest += Ustrlen(rsopts[i]);
3227 /* -R: Set string to match in addresses for forced queue run to
3228 pick out particular messages. */
3231 deliver_selectstring = argrest;
3232 else if (i+1 < argc)
3233 deliver_selectstring = argv[++i];
3235 exim_fail("exim: string expected after -R\n");
3239 /* -r: an obsolete synonym for -f (see above) */
3242 /* -S: Like -R but works on sender. */
3244 case 'S': /* Synonymous with -qS... */
3245 receiving_message = FALSE;
3247 /* -Sf: As -S (below) but force all deliveries,
3248 -Sff: Ditto, but also thaw all frozen messages,
3249 -Sr: String is regex
3250 -Srf: Regex and force
3251 -Srff: Regex and force and thaw
3253 in all cases provided there are no further characters in this
3259 for (i = 0; i < nelem(rsopts); i++)
3260 if (Ustrcmp(argrest, rsopts[i]) == 0)
3262 if (i != 2) f.queue_run_force = TRUE;
3263 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3264 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3265 argrest += Ustrlen(rsopts[i]);
3269 /* -S: Set string to match in addresses for forced queue run to
3270 pick out particular messages. */
3273 deliver_selectstring_sender = argrest;
3274 else if (i+1 < argc)
3275 deliver_selectstring_sender = argv[++i];
3277 exim_fail("exim: string expected after -S\n");
3280 /* -Tqt is an option that is exclusively for use by the testing suite.
3281 It is not recognized in other circumstances. It allows for the setting up
3282 of explicit "queue times" so that various warning/retry things can be
3283 tested. Otherwise variability of clock ticks etc. cause problems. */
3286 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3287 fudged_queue_times = argv[++i];
3292 /* -t: Set flag to extract recipients from body of message. */
3295 if (*argrest == 0) extract_recipients = TRUE;
3297 /* -ti: Set flag to extract recipients from body of message, and also
3298 specify that dot does not end the message. */
3300 else if (Ustrcmp(argrest, "i") == 0)
3302 extract_recipients = TRUE;
3306 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3309 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3316 /* -U: This means "initial user submission" in sendmail, apparently. The
3317 doc claims that in future sendmail may refuse syntactically invalid
3318 messages instead of fixing them. For the moment, we just ignore it. */
3324 /* -v: verify things - this is a very low-level debugging */
3329 debug_selector |= D_v;
3330 debug_file = stderr;
3336 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3338 The -x flag tells the sendmail command that mail from a local
3339 mail program has National Language Support (NLS) extended characters
3340 in the body of the mail item. The sendmail command can send mail with
3341 extended NLS characters across networks that normally corrupts these
3344 As Exim is 8-bit clean, it just ignores this flag. */
3347 if (*argrest != 0) badarg = TRUE;
3350 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3351 logs to that file. We swallow the parameter and otherwise ignore it. */
3354 if (*argrest == '\0')
3356 exim_fail("exim: string expected after -X\n");
3360 if (*argrest == '\0')
3362 log_oneline = argv[i];
3364 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3367 /* All other initial characters are errors */
3372 } /* End of high-level switch statement */
3374 /* Failed to recognize the option, or syntax error */
3377 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3378 "option %s\n", arg);
3382 /* If -R or -S have been specified without -q, assume a single queue run. */
3384 if ( (deliver_selectstring || deliver_selectstring_sender)
3385 && queue_interval < 0)
3390 /* If usage_wanted is set we call the usage function - which never returns */
3391 if (usage_wanted) exim_usage(called_as);
3393 /* Arguments have been processed. Check for incompatibilities. */
3395 (smtp_input || extract_recipients || recipients_arg < argc) &&
3396 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3397 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3398 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3401 msg_action_arg > 0 &&
3402 (f.daemon_listen || queue_interval > 0 || list_options ||
3403 (checking && msg_action != MSG_LOAD) ||
3404 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3407 (f.daemon_listen || queue_interval > 0) &&
3408 (sender_address != NULL || list_options || list_queue || checking ||
3412 f.daemon_listen && queue_interval == 0
3415 f.inetd_wait_mode && queue_interval >= 0
3419 (checking || smtp_input || extract_recipients ||
3420 filter_test != FTEST_NONE || bi_option)
3423 verify_address_mode &&
3424 (f.address_test_mode || smtp_input || extract_recipients ||
3425 filter_test != FTEST_NONE || bi_option)
3428 f.address_test_mode && (smtp_input || extract_recipients ||
3429 filter_test != FTEST_NONE || bi_option)
3432 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3436 deliver_selectstring != NULL && queue_interval < 0
3439 msg_action == MSG_LOAD &&
3440 (!expansion_test || expansion_test_message != NULL)
3443 exim_fail("exim: incompatible command-line options or arguments\n");
3445 /* If debugging is set up, set the file and the file descriptor to pass on to
3446 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3447 to run in the foreground. */
3449 if (debug_selector != 0)
3451 debug_file = stderr;
3452 debug_fd = fileno(debug_file);
3453 f.background_daemon = FALSE;
3454 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3455 if (debug_selector != D_v) /* -v only doesn't show this */
3457 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3458 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3460 if (!version_printed)
3461 show_whats_supported(stderr);
3465 /* When started with root privilege, ensure that the limits on the number of
3466 open files and the number of processes (where that is accessible) are
3467 sufficiently large, or are unset, in case Exim has been called from an
3468 environment where the limits are screwed down. Not all OS have the ability to
3469 change some of these limits. */
3473 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3479 #ifdef RLIMIT_NOFILE
3480 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3482 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3484 rlp.rlim_cur = rlp.rlim_max = 0;
3487 /* I originally chose 1000 as a nice big number that was unlikely to
3488 be exceeded. It turns out that some older OS have a fixed upper limit of
3491 if (rlp.rlim_cur < 1000)
3493 rlp.rlim_cur = rlp.rlim_max = 1000;
3494 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3496 rlp.rlim_cur = rlp.rlim_max = 256;
3497 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3498 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3505 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3507 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3509 rlp.rlim_cur = rlp.rlim_max = 0;
3512 #ifdef RLIM_INFINITY
3513 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3515 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3517 if (rlp.rlim_cur < 1000)
3519 rlp.rlim_cur = rlp.rlim_max = 1000;
3521 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3522 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3528 /* Exim is normally entered as root (but some special configurations are
3529 possible that don't do this). However, it always spins off sub-processes that
3530 set their uid and gid as required for local delivery. We don't want to pass on
3531 any extra groups that root may belong to, so we want to get rid of them all at
3534 We need to obey setgroups() at this stage, before possibly giving up root
3535 privilege for a changed configuration file, but later on we might need to
3536 check on the additional groups for the admin user privilege - can't do that
3537 till after reading the config, which might specify the exim gid. Therefore,
3538 save the group list here first. */
3540 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3541 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3543 /* There is a fundamental difference in some BSD systems in the matter of
3544 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3545 known not to be different. On the "different" systems there is a single group
3546 list, and the first entry in it is the current group. On all other versions of
3547 Unix there is a supplementary group list, which is in *addition* to the current
3548 group. Consequently, to get rid of all extraneous groups on a "standard" system
3549 you pass over 0 groups to setgroups(), while on a "different" system you pass
3550 over a single group - the current group, which is always the first group in the
3551 list. Calling setgroups() with zero groups on a "different" system results in
3552 an error return. The following code should cope with both types of system.
3554 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3555 the "setgroups() with zero groups" - and changes the egid.
3556 Thanks to that we had to stash the original_egid above, for use below
3557 in the call to exim_setugid().
3559 However, if this process isn't running as root, setgroups() can't be used
3560 since you have to be root to run it, even if throwing away groups. Not being
3561 root here happens only in some unusual configurations. We just ignore the
3564 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3565 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3567 /* If the configuration file name has been altered by an argument on the
3568 command line (either a new file name or a macro definition) and the caller is
3569 not root, or if this is a filter testing run, remove any setuid privilege the
3570 program has and run as the underlying user.
3572 The exim user is locked out of this, which severely restricts the use of -C
3575 Otherwise, set the real ids to the effective values (should be root unless run
3576 from inetd, which it can either be root or the exim uid, if one is configured).
3578 There is a private mechanism for bypassing some of this, in order to make it
3579 possible to test lots of configurations automatically, without having either to
3580 recompile each time, or to patch in an actual configuration file name and other
3581 values (such as the path name). If running in the test harness, pretend that
3582 configuration file changes and macro definitions haven't happened. */
3585 (!f.trusted_config || /* Config changed, or */
3586 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3587 real_uid != root_uid && /* Not root, and */
3588 !f.running_in_test_harness /* Not fudged */
3590 expansion_test /* expansion testing */
3592 filter_test != FTEST_NONE) /* Filter testing */
3594 setgroups(group_count, group_list);
3595 exim_setugid(real_uid, real_gid, FALSE,
3596 US"-C, -D, -be or -bf forces real uid");
3597 removed_privilege = TRUE;
3599 /* In the normal case when Exim is called like this, stderr is available
3600 and should be used for any logging information because attempts to write
3601 to the log will usually fail. To arrange this, we unset really_exim. However,
3602 if no stderr is available there is no point - we might as well have a go
3603 at the log (if it fails, syslog will be written).
3605 Note that if the invoker is Exim, the logs remain available. Messing with
3606 this causes unlogged successful deliveries. */
3608 if (log_stderr && real_uid != exim_uid)
3609 f.really_exim = FALSE;
3612 /* Privilege is to be retained for the moment. It may be dropped later,
3613 depending on the job that this Exim process has been asked to do. For now, set
3614 the real uid to the effective so that subsequent re-execs of Exim are done by a
3618 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3620 /* If testing a filter, open the file(s) now, before wasting time doing other
3621 setups and reading the message. */
3623 if (filter_test & FTEST_SYSTEM)
3624 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3625 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3628 if (filter_test & FTEST_USER)
3629 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3630 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3633 /* Initialise lookup_list
3634 If debugging, already called above via version reporting.
3635 In either case, we initialise the list of available lookups while running
3636 as root. All dynamically modules are loaded from a directory which is
3637 hard-coded into the binary and is code which, if not a module, would be
3638 part of Exim already. Ability to modify the content of the directory
3639 is equivalent to the ability to modify a setuid binary!
3641 This needs to happen before we read the main configuration. */
3645 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3648 /* Read the main runtime configuration data; this gives up if there
3649 is a failure. It leaves the configuration file open so that the subsequent
3650 configuration data for delivery can be read if needed.
3652 NOTE: immediatly after opening the configuration file we change the working
3653 directory to "/"! Later we change to $spool_directory. We do it there, because
3654 during readconf_main() some expansion takes place already. */
3656 /* Store the initial cwd before we change directories. Can be NULL if the
3657 dir has already been unlinked. */
3658 initial_cwd = os_getcwd(NULL, 0);
3661 -be[m] expansion test -
3662 -b[fF] filter test new
3664 -bmalware malware_test_file new
3666 -brw rewrite test new
3668 -bv[s] address verify -
3670 -bP <option> (except -bP config, which sets list_config)
3672 If any of these options is set, we suppress warnings about configuration
3673 issues (currently about tls_advertise_hosts and keep_environment not being
3676 readconf_main(checking || list_options);
3679 /* Now in directory "/" */
3681 if (cleanup_environment() == FALSE)
3682 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3685 /* If an action on specific messages is requested, or if a daemon or queue
3686 runner is being started, we need to know if Exim was called by an admin user.
3687 This is the case if the real user is root or exim, or if the real group is
3688 exim, or if one of the supplementary groups is exim or a group listed in
3689 admin_groups. We don't fail all message actions immediately if not admin_user,
3690 since some actions can be performed by non-admin users. Instead, set admin_user
3691 for later interrogation. */
3693 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3694 f.admin_user = TRUE;
3698 for (i = 0; i < group_count && !f.admin_user; i++)
3699 if (group_list[i] == exim_gid)
3700 f.admin_user = TRUE;
3701 else if (admin_groups)
3702 for (j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3703 if (admin_groups[j] == group_list[i])
3704 f.admin_user = TRUE;
3707 /* Another group of privileged users are the trusted users. These are root,
3708 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3709 are permitted to specify sender_addresses with -f on the command line, and
3710 other message parameters as well. */
3712 if (real_uid == root_uid || real_uid == exim_uid)
3713 f.trusted_caller = TRUE;
3719 for (i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3720 if (trusted_users[i] == real_uid)
3721 f.trusted_caller = TRUE;
3724 for (i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3725 if (trusted_groups[i] == real_gid)
3726 f.trusted_caller = TRUE;
3727 else for (j = 0; j < group_count && !f.trusted_caller; j++)
3728 if (trusted_groups[i] == group_list[j])
3729 f.trusted_caller = TRUE;
3732 /* At this point, we know if the user is privileged and some command-line
3733 options become possibly impermissible, depending upon the configuration file. */
3735 if (checking && commandline_checks_require_admin && !f.admin_user)
3736 exim_fail("exim: those command-line flags are set to require admin\n");
3738 /* Handle the decoding of logging options. */
3740 decode_bits(log_selector, log_selector_size, log_notall,
3741 log_selector_string, log_options, log_options_count, US"log", 0);
3746 debug_printf("configuration file is %s\n", config_main_filename);
3747 debug_printf("log selectors =");
3748 for (i = 0; i < log_selector_size; i++)
3749 debug_printf(" %08x", log_selector[i]);
3753 /* If domain literals are not allowed, check the sender address that was
3754 supplied with -f. Ditto for a stripped trailing dot. */
3758 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3759 exim_fail("exim: bad -f address \"%s\": domain literals not "
3760 "allowed\n", sender_address);
3761 if (f_end_dot && !strip_trailing_dot)
3762 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3763 "(trailing dot not allowed)\n", sender_address);
3766 /* See if an admin user overrode our logging. */
3768 if (cmdline_syslog_name)
3771 syslog_processname = cmdline_syslog_name;
3772 log_file_path = string_copy(CUS"syslog");
3775 /* not a panic, non-privileged users should not be able to spam paniclog */
3777 "exim: you lack sufficient privilege to specify syslog process name\n");
3779 /* Paranoia check of maximum lengths of certain strings. There is a check
3780 on the length of the log file path in log.c, which will come into effect
3781 if there are any calls to write the log earlier than this. However, if we
3782 get this far but the string is very long, it is better to stop now than to
3783 carry on and (e.g.) receive a message and then have to collapse. The call to
3784 log_write() from here will cause the ultimate panic collapse if the complete
3785 file name exceeds the buffer length. */
3787 if (Ustrlen(log_file_path) > 200)
3788 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3789 "log_file_path is longer than 200 chars: aborting");
3791 if (Ustrlen(pid_file_path) > 200)
3792 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3793 "pid_file_path is longer than 200 chars: aborting");
3795 if (Ustrlen(spool_directory) > 200)
3796 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3797 "spool_directory is longer than 200 chars: aborting");
3799 /* Length check on the process name given to syslog for its TAG field,
3800 which is only permitted to be 32 characters or less. See RFC 3164. */
3802 if (Ustrlen(syslog_processname) > 32)
3803 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3804 "syslog_processname is longer than 32 chars: aborting");
3809 log_write(0, LOG_MAIN, "%s", log_oneline);
3810 return EXIT_SUCCESS;
3813 return EXIT_FAILURE;
3815 /* In some operating systems, the environment variable TMPDIR controls where
3816 temporary files are created; Exim doesn't use these (apart from when delivering
3817 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3818 If TMPDIR is found in the environment, reset it to the value defined in the
3819 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3820 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3821 EXIM_TMPDIR by the build scripts.
3827 if (environ) for (p = USS environ; *p; p++)
3828 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3830 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3831 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3833 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3838 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3839 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3840 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3841 called by a user who has set the TZ variable. This then affects the timestamps
3842 in log files and in Received: headers, and any created Date: header lines. The
3843 required timezone is settable in the configuration file, so nothing can be done
3844 about this earlier - but hopefully nothing will normally be logged earlier than
3845 this. We have to make a new environment if TZ is wrong, but don't bother if
3846 timestamps_utc is set, because then all times are in UTC anyway. */
3848 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3849 f.timestamps_utc = TRUE;
3852 uschar *envtz = US getenv("TZ");
3854 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3855 : timezone_string != NULL
3858 uschar **p = USS environ;
3862 if (environ) while (*p++) count++;
3863 if (!envtz) count++;
3864 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3865 if (environ) for (p = USS environ; *p; p++)
3866 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3867 if (timezone_string)
3869 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3870 sprintf(CS *newp++, "TZ=%s", timezone_string);
3875 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3876 tod_stamp(tod_log));
3880 /* Handle the case when we have removed the setuid privilege because of -C or
3881 -D. This means that the caller of Exim was not root.
3883 There is a problem if we were running as the Exim user. The sysadmin may
3884 expect this case to retain privilege because "the binary was called by the
3885 Exim user", but it hasn't, because either the -D option set macros, or the
3886 -C option set a non-trusted configuration file. There are two possibilities:
3888 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3889 to do message deliveries. Thus, the fact that it is running as a
3890 non-privileged user is plausible, and might be wanted in some special
3891 configurations. However, really_exim will have been set false when
3892 privilege was dropped, to stop Exim trying to write to its normal log
3893 files. Therefore, re-enable normal log processing, assuming the sysadmin
3894 has set up the log directory correctly.
3896 (2) If deliver_drop_privilege is not set, the configuration won't work as
3897 apparently intended, and so we log a panic message. In order to retain
3898 root for -C or -D, the caller must either be root or be invoking a
3899 trusted configuration file (when deliver_drop_privilege is false). */
3901 if ( removed_privilege
3902 && (!f.trusted_config || opt_D_used)
3903 && real_uid == exim_uid)
3904 if (deliver_drop_privilege)
3905 f.really_exim = TRUE; /* let logging work normally */
3907 log_write(0, LOG_MAIN|LOG_PANIC,
3908 "exim user lost privilege for using %s option",
3909 f.trusted_config? "-D" : "-C");
3911 /* Start up Perl interpreter if Perl support is configured and there is a
3912 perl_startup option, and the configuration or the command line specifies
3913 initializing starting. Note that the global variables are actually called
3914 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3917 if (perl_start_option != 0)
3918 opt_perl_at_start = (perl_start_option > 0);
3919 if (opt_perl_at_start && opt_perl_startup != NULL)
3922 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3923 if ((errstr = init_perl(opt_perl_startup)))
3924 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3925 opt_perl_started = TRUE;
3927 #endif /* EXIM_PERL */
3929 /* Log the arguments of the call if the configuration file said so. This is
3930 a debugging feature for finding out what arguments certain MUAs actually use.
3931 Don't attempt it if logging is disabled, or if listing variables or if
3932 verifying/testing addresses or expansions. */
3934 if ( (debug_selector & D_any || LOGGING(arguments))
3935 && f.really_exim && !list_options && !checking)
3938 uschar *p = big_buffer;
3939 Ustrcpy(p, "cwd= (failed)");
3945 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3946 p += 4 + Ustrlen(initial_cwd);
3947 /* in case p is near the end and we don't provide enough space for
3948 * string_format to be willing to write. */
3952 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3954 for (i = 0; i < argc; i++)
3956 int len = Ustrlen(argv[i]);
3957 const uschar *printing;
3959 if (p + len + 8 >= big_buffer + big_buffer_size)
3962 log_write(0, LOG_MAIN, "%s", big_buffer);
3963 Ustrcpy(big_buffer, "...");
3966 printing = string_printing(argv[i]);
3967 if (printing[0] == 0) quote = US"\""; else
3969 const uschar *pp = printing;
3971 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3973 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3974 (p - big_buffer) - 4), printing, quote);
3977 if (LOGGING(arguments))
3978 log_write(0, LOG_MAIN, "%s", big_buffer);
3980 debug_printf("%s\n", big_buffer);
3983 /* Set the working directory to be the top-level spool directory. We don't rely
3984 on this in the code, which always uses fully qualified names, but it's useful
3985 for core dumps etc. Don't complain if it fails - the spool directory might not
3986 be generally accessible and calls with the -C option (and others) have lost
3987 privilege by now. Before the chdir, we try to ensure that the directory exists.
3990 if (Uchdir(spool_directory) != 0)
3993 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3994 dummy = /* quieten compiler */ Uchdir(spool_directory);
3995 dummy = dummy; /* yet more compiler quietening, sigh */
3998 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3999 alias file. Exim doesn't have such a concept, but this call is screwed into
4000 Sun's YP makefiles. Handle this by calling a configured script, as the real
4001 user who called Exim. The -oA option can be used to pass an argument to the
4006 (void)fclose(config_file);
4007 if (bi_command != NULL)
4011 argv[i++] = bi_command;
4012 if (alias_arg != NULL) argv[i++] = alias_arg;
4015 setgroups(group_count, group_list);
4016 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4018 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4019 (argv[1] == NULL)? US"" : argv[1]);
4021 execv(CS argv[0], (char *const *)argv);
4022 exim_fail("exim: exec failed: %s\n", strerror(errno));
4026 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4031 /* We moved the admin/trusted check to be immediately after reading the
4032 configuration file. We leave these prints here to ensure that syslog setup,
4033 logfile setup, and so on has already happened. */
4035 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4036 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4038 /* Only an admin user may start the daemon or force a queue run in the default
4039 configuration, but the queue run restriction can be relaxed. Only an admin
4040 user may request that a message be returned to its sender forthwith. Only an
4041 admin user may specify a debug level greater than D_v (because it might show
4042 passwords, etc. in lookup queries). Only an admin user may request a queue
4043 count. Only an admin user can use the test interface to scan for email
4044 (because Exim will be in the spool dir and able to look at mails). */
4048 BOOL debugset = (debug_selector & ~D_v) != 0;
4049 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4050 (count_queue && queue_list_requires_admin) ||
4051 (list_queue && queue_list_requires_admin) ||
4052 (queue_interval >= 0 && prod_requires_admin) ||
4053 (debugset && !f.running_in_test_harness))
4054 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4057 /* If the real user is not root or the exim uid, the argument for passing
4058 in an open TCP/IP connection for another message is not permitted, nor is
4059 running with the -N option for any delivery action, unless this call to exim is
4060 one that supplied an input message, or we are using a patched exim for
4061 regression testing. */
4063 if (real_uid != root_uid && real_uid != exim_uid &&
4064 (continue_hostname != NULL ||
4066 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4067 )) && !f.running_in_test_harness)
4068 exim_fail("exim: Permission denied\n");
4070 /* If the caller is not trusted, certain arguments are ignored when running for
4071 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4072 Note that authority for performing certain actions on messages is tested in the
4073 queue_action() function. */
4075 if (!f.trusted_caller && !checking)
4077 sender_host_name = sender_host_address = interface_address =
4078 sender_ident = received_protocol = NULL;
4079 sender_host_port = interface_port = 0;
4080 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4083 /* If a sender host address is set, extract the optional port number off the
4084 end of it and check its syntax. Do the same thing for the interface address.
4085 Exim exits if the syntax is bad. */
4089 if (sender_host_address != NULL)
4090 sender_host_port = check_port(sender_host_address);
4091 if (interface_address != NULL)
4092 interface_port = check_port(interface_address);
4095 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4098 if (f.trusted_caller)
4100 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4101 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4104 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4107 /* If an SMTP message is being received check to see if the standard input is a
4108 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4109 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4114 union sockaddr_46 inetd_sock;
4115 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4116 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4118 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4119 if (family == AF_INET || family == AF_INET6)
4121 union sockaddr_46 interface_sock;
4122 size = sizeof(interface_sock);
4124 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4125 interface_address = host_ntoa(-1, &interface_sock, NULL,
4128 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4130 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4133 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4134 NULL, &sender_host_port);
4135 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4136 "inetd is not supported when mua_wrapper is set");
4140 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4145 /* If the load average is going to be needed while receiving a message, get it
4146 now for those OS that require the first call to os_getloadavg() to be done as
4147 root. There will be further calls later for each message received. */
4149 #ifdef LOAD_AVG_NEEDS_ROOT
4150 if (receiving_message &&
4151 (queue_only_load >= 0 ||
4152 (f.is_inetd && smtp_load_reserve >= 0)
4155 load_average = OS_GETLOADAVG();
4159 /* The queue_only configuration option can be overridden by -odx on the command
4160 line, except that if queue_only_override is false, queue_only cannot be unset
4161 from the command line. */
4163 if (queue_only_set && (queue_only_override || arg_queue_only))
4164 queue_only = arg_queue_only;
4166 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4169 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4170 if (arg_smtp_receive_timeout >= 0)
4171 smtp_receive_timeout = arg_smtp_receive_timeout;
4173 /* If Exim was started with root privilege, unless we have already removed the
4174 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4175 except when starting the daemon or doing some kind of delivery or address
4176 testing (-bt). These are the only cases when root need to be retained. We run
4177 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4178 retained only for starting the daemon. We always do the initgroups() in this
4179 situation (controlled by the TRUE below), in order to be as close as possible
4180 to the state Exim usually runs in. */
4182 if (!unprivileged && /* originally had root AND */
4183 !removed_privilege && /* still got root AND */
4184 !f.daemon_listen && /* not starting the daemon */
4185 queue_interval <= 0 && /* (either kind of daemon) */
4187 deliver_drop_privilege || /* requested unprivileged */
4189 queue_interval < 0 && /* not running the queue */
4190 (msg_action_arg < 0 || /* and */
4191 msg_action != MSG_DELIVER) && /* not delivering and */
4192 (!checking || !f.address_test_mode) /* not address checking */
4194 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4196 /* When we are retaining a privileged uid, we still change to the exim gid. */
4201 rv = setgid(exim_gid);
4202 /* Impact of failure is that some stuff might end up with an incorrect group.
4203 We track this for failures from root, since any attempt to change privilege
4204 by root should succeed and failures should be examined. For non-root,
4205 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4206 no need to complain then. */
4208 if (!(unprivileged || removed_privilege))
4209 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4211 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4212 (long int)exim_gid, strerror(errno));
4215 /* Handle a request to scan a file for malware */
4216 if (malware_test_file)
4218 #ifdef WITH_CONTENT_SCAN
4220 set_process_info("scanning file for malware");
4221 result = malware_in_file(malware_test_file);
4224 printf("No malware found.\n");
4229 printf("Malware lookup returned non-okay/fail: %d\n", result);
4233 printf("Malware found: %s\n", malware_name);
4235 printf("Malware scan detected malware of unknown name.\n");
4237 printf("Malware scanning not enabled at compile time.\n");
4242 /* Handle a request to list the delivery queue */
4246 set_process_info("listing the queue");
4247 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4251 /* Handle a request to count the delivery queue */
4255 set_process_info("counting the queue");
4260 /* Handle actions on specific messages, except for the force delivery and
4261 message load actions, which are done below. Some actions take a whole list of
4262 message ids, which are known to continue up to the end of the arguments. Others
4263 take a single message id and then operate on the recipients list. */
4265 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4267 int yield = EXIT_SUCCESS;
4268 set_process_info("acting on specified messages");
4270 /* ACL definitions may be needed when removing a message (-Mrm) because
4271 event_action gets expanded */
4273 if (msg_action == MSG_REMOVE)
4276 if (!one_msg_action)
4278 for (i = msg_action_arg; i < argc; i++)
4279 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4280 yield = EXIT_FAILURE;
4283 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4284 recipients_arg)) yield = EXIT_FAILURE;
4288 /* We used to set up here to skip reading the ACL section, on
4289 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4290 Now, since the intro of the ${acl } expansion, ACL definitions may be
4291 needed in transports so we lost the optimisation. */
4295 /* The configuration data will have been read into POOL_PERM because we won't
4296 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4297 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4298 configuration were read into POOL_MAIN, because we don't do any resets till
4299 later on. However, it seems right, and it does ensure that both pools get used.
4302 store_pool = POOL_MAIN;
4304 /* Handle the -brt option. This is for checking out retry configurations.
4305 The next three arguments are a domain name or a complete address, and
4306 optionally two error numbers. All it does is to call the function that
4307 scans the retry configuration data. */
4309 if (test_retry_arg >= 0)
4311 retry_config *yield;
4312 int basic_errno = 0;
4316 if (test_retry_arg >= argc)
4318 printf("-brt needs a domain or address argument\n");
4319 exim_exit(EXIT_FAILURE, US"main");
4321 s1 = argv[test_retry_arg++];
4324 /* If the first argument contains no @ and no . it might be a local user
4325 or it might be a single-component name. Treat as a domain. */
4327 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4329 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4330 "being \ntreated as a one-component domain, not as a local part.\n\n",
4334 /* There may be an optional second domain arg. */
4336 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4337 s2 = argv[test_retry_arg++];
4339 /* The final arg is an error name */
4341 if (test_retry_arg < argc)
4343 uschar *ss = argv[test_retry_arg];
4345 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4348 printf("%s\n", CS error);
4349 return EXIT_FAILURE;
4352 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4353 code > 100 as an error is for matching codes to the decade. Turn them into
4354 a real error code, off the decade. */
4356 if (basic_errno == ERRNO_MAIL4XX ||
4357 basic_errno == ERRNO_RCPT4XX ||
4358 basic_errno == ERRNO_DATA4XX)
4360 int code = (more_errno >> 8) & 255;
4362 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4363 else if (code > 100)
4364 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4368 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4369 printf("No retry information found\n");
4373 more_errno = yield->more_errno;
4374 printf("Retry rule: %s ", yield->pattern);
4376 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4378 printf("quota%s%s ",
4379 (more_errno > 0)? "_" : "",
4380 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4382 else if (yield->basic_errno == ECONNREFUSED)
4384 printf("refused%s%s ",
4385 (more_errno > 0)? "_" : "",
4386 (more_errno == 'M')? "MX" :
4387 (more_errno == 'A')? "A" : "");
4389 else if (yield->basic_errno == ETIMEDOUT)
4392 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4394 if (more_errno != 0) printf("_%s",
4395 (more_errno == 'M')? "MX" : "A");
4398 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4399 printf("auth_failed ");
4402 for (r = yield->rules; r; r = r->next)
4404 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4405 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4411 printf(",%d.", x/1000);
4425 exim_exit(EXIT_SUCCESS, US"main");
4428 /* Handle a request to list one or more configuration options */
4429 /* If -n was set, we suppress some information */
4434 set_process_info("listing variables");
4435 if (recipients_arg >= argc)
4436 fail = !readconf_print(US"all", NULL, flag_n);
4437 else for (i = recipients_arg; i < argc; i++)
4440 (Ustrcmp(argv[i], "router") == 0 ||
4441 Ustrcmp(argv[i], "transport") == 0 ||
4442 Ustrcmp(argv[i], "authenticator") == 0 ||
4443 Ustrcmp(argv[i], "macro") == 0 ||
4444 Ustrcmp(argv[i], "environment") == 0))
4446 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4450 fail = !readconf_print(argv[i], NULL, flag_n);
4452 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4457 set_process_info("listing config");
4458 exim_exit(readconf_print(US"config", NULL, flag_n)
4459 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4463 /* Initialise subsystems as required */
4464 #ifndef DISABLE_DKIM
4470 /* Handle a request to deliver one or more messages that are already on the
4471 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4472 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4474 Delivery of specific messages is typically used for a small number when
4475 prodding by hand (when the option forced_delivery will be set) or when
4476 re-execing to regain root privilege. Each message delivery must happen in a
4477 separate process, so we fork a process for each one, and run them sequentially
4478 so that debugging output doesn't get intertwined, and to avoid spawning too
4479 many processes if a long list is given. However, don't fork for the last one;
4480 this saves a process in the common case when Exim is called to deliver just one
4483 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4485 if (prod_requires_admin && !f.admin_user)
4487 fprintf(stderr, "exim: Permission denied\n");
4488 exim_exit(EXIT_FAILURE, US"main");
4490 set_process_info("delivering specified messages");
4491 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4492 for (i = msg_action_arg; i < argc; i++)
4497 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4498 else if ((pid = fork()) == 0)
4500 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4501 _exit(EXIT_SUCCESS);
4505 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4507 exim_exit(EXIT_FAILURE, US"main");
4511 exim_exit(EXIT_SUCCESS, US"main");
4515 /* If only a single queue run is requested, without SMTP listening, we can just
4516 turn into a queue runner, with an optional starting message id. */
4518 if (queue_interval == 0 && !f.daemon_listen)
4520 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4521 (start_queue_run_id == NULL)? US"" : US" starting at ",
4522 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4523 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4524 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4526 set_process_info("running the '%s' queue (single queue run)", queue_name);
4528 set_process_info("running the queue (single queue run)");
4529 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4530 exim_exit(EXIT_SUCCESS, US"main");
4534 /* Find the login name of the real user running this process. This is always
4535 needed when receiving a message, because it is written into the spool file. It
4536 may also be used to construct a from: or a sender: header, and in this case we
4537 need the user's full name as well, so save a copy of it, checked for RFC822
4538 syntax and munged if necessary, if it hasn't previously been set by the -F
4539 argument. We may try to get the passwd entry more than once, in case NIS or
4540 other delays are in evidence. Save the home directory for use in filter testing
4545 if ((pw = getpwuid(real_uid)) != NULL)
4547 originator_login = string_copy(US pw->pw_name);
4548 originator_home = string_copy(US pw->pw_dir);
4550 /* If user name has not been set by -F, set it from the passwd entry
4551 unless -f has been used to set the sender address by a trusted user. */
4553 if (!originator_name)
4555 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4557 uschar *name = US pw->pw_gecos;
4558 uschar *amp = Ustrchr(name, '&');
4561 /* Most Unix specify that a '&' character in the gecos field is
4562 replaced by a copy of the login name, and some even specify that
4563 the first character should be upper cased, so that's what we do. */
4568 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4569 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4570 buffer[loffset] = toupper(buffer[loffset]);
4574 /* If a pattern for matching the gecos field was supplied, apply
4575 it and then expand the name string. */
4577 if (gecos_pattern && gecos_name)
4580 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4582 if (regex_match_and_setup(re, name, 0, -1))
4584 uschar *new_name = expand_string(gecos_name);
4588 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4589 "gecos field \"%s\"\n", new_name, name);
4592 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4593 "\"%s\": %s\n", gecos_name, expand_string_message);
4595 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4596 "gecos field \"%s\"\n", gecos_pattern, name);
4597 store_free((void *)re);
4599 originator_name = string_copy(name);
4602 /* A trusted caller has used -f but not -F */
4604 else originator_name = US"";
4607 /* Break the retry loop */
4612 if (++i > finduser_retries) break;
4616 /* If we cannot get a user login, log the incident and give up, unless the
4617 configuration specifies something to use. When running in the test harness,
4618 any setting of unknown_login overrides the actual name. */
4620 if (originator_login == NULL || f.running_in_test_harness)
4622 if (unknown_login != NULL)
4624 originator_login = expand_string(unknown_login);
4625 if (originator_name == NULL && unknown_username != NULL)
4626 originator_name = expand_string(unknown_username);
4627 if (originator_name == NULL) originator_name = US"";
4629 if (originator_login == NULL)
4630 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4634 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4637 originator_name = string_copy(parse_fix_phrase(originator_name,
4638 Ustrlen(originator_name), big_buffer, big_buffer_size));
4640 /* If a message is created by this call of Exim, the uid/gid of its originator
4641 are those of the caller. These values are overridden if an existing message is
4642 read in from the spool. */
4644 originator_uid = real_uid;
4645 originator_gid = real_gid;
4647 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4648 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4650 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4651 returns. We leave this till here so that the originator_ fields are available
4652 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4655 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4659 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4660 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4661 "mua_wrapper is set");
4666 /* If the sender ident has not been set (by a trusted caller) set it to
4667 the caller. This will get overwritten below for an inetd call. If a trusted
4668 caller has set it empty, unset it. */
4670 if (sender_ident == NULL) sender_ident = originator_login;
4671 else if (sender_ident[0] == 0) sender_ident = NULL;
4673 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4674 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4675 originator_* variables set. */
4677 if (test_rewrite_arg >= 0)
4679 f.really_exim = FALSE;
4680 if (test_rewrite_arg >= argc)
4682 printf("-brw needs an address argument\n");
4683 exim_exit(EXIT_FAILURE, US"main");
4685 rewrite_test(argv[test_rewrite_arg]);
4686 exim_exit(EXIT_SUCCESS, US"main");
4689 /* A locally-supplied message is considered to be coming from a local user
4690 unless a trusted caller supplies a sender address with -f, or is passing in the
4691 message via SMTP (inetd invocation or otherwise). */
4693 if ((sender_address == NULL && !smtp_input) ||
4694 (!f.trusted_caller && filter_test == FTEST_NONE))
4696 f.sender_local = TRUE;
4698 /* A trusted caller can supply authenticated_sender and authenticated_id
4699 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4700 defaults except when host checking. */
4702 if (authenticated_sender == NULL && !host_checking)
4703 authenticated_sender = string_sprintf("%s@%s", originator_login,
4704 qualify_domain_sender);
4705 if (authenticated_id == NULL && !host_checking)
4706 authenticated_id = originator_login;
4709 /* Trusted callers are always permitted to specify the sender address.
4710 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4711 is specified is the empty address. However, if a trusted caller does not
4712 specify a sender address for SMTP input, we leave sender_address unset. This
4713 causes the MAIL commands to be honoured. */
4715 if ((!smtp_input && sender_address == NULL) ||
4716 !receive_check_set_sender(sender_address))
4718 /* Either the caller is not permitted to set a general sender, or this is
4719 non-SMTP input and the trusted caller has not set a sender. If there is no
4720 sender, or if a sender other than <> is set, override with the originator's
4721 login (which will get qualified below), except when checking things. */
4723 if (sender_address == NULL /* No sender_address set */
4725 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4726 !checking)) /* Not running tests, including filter tests */
4728 sender_address = originator_login;
4729 f.sender_address_forced = FALSE;
4730 sender_address_domain = 0;
4734 /* Remember whether an untrusted caller set the sender address */
4736 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4738 /* Ensure that the sender address is fully qualified unless it is the empty
4739 address, which indicates an error message, or doesn't exist (root caller, smtp
4740 interface, no -f argument). */
4742 if (sender_address != NULL && sender_address[0] != 0 &&
4743 sender_address_domain == 0)
4744 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4745 qualify_domain_sender);
4747 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4749 /* Handle a request to verify a list of addresses, or test them for delivery.
4750 This must follow the setting of the sender address, since routers can be
4751 predicated upon the sender. If no arguments are given, read addresses from
4752 stdin. Set debug_level to at least D_v to get full output for address testing.
4755 if (verify_address_mode || f.address_test_mode)
4758 int flags = vopt_qualify;
4760 if (verify_address_mode)
4762 if (!verify_as_sender) flags |= vopt_is_recipient;
4763 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4768 flags |= vopt_is_recipient;
4769 debug_selector |= D_v;
4770 debug_file = stderr;
4771 debug_fd = fileno(debug_file);
4772 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4775 if (recipients_arg < argc)
4777 while (recipients_arg < argc)
4779 uschar *s = argv[recipients_arg++];
4782 BOOL finished = FALSE;
4783 uschar *ss = parse_find_address_end(s, FALSE);
4784 if (*ss == ',') *ss = 0; else finished = TRUE;
4785 test_address(s, flags, &exit_value);
4788 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4795 uschar *s = get_stdinput(NULL, NULL);
4796 if (s == NULL) break;
4797 test_address(s, flags, &exit_value);
4801 exim_exit(exit_value, US"main");
4804 /* Handle expansion checking. Either expand items on the command line, or read
4805 from stdin if there aren't any. If -Mset was specified, load the message so
4806 that its variables can be used, but restrict this facility to admin users.
4807 Otherwise, if -bem was used, read a message from stdin. */
4811 dns_init(FALSE, FALSE, FALSE);
4812 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4814 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4816 exim_fail("exim: permission denied\n");
4817 message_id = argv[msg_action_arg];
4818 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4819 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4820 printf ("Failed to load message datafile %s\n", message_id);
4821 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4822 printf ("Failed to load message %s\n", message_id);
4825 /* Read a test message from a file. We fudge it up to be on stdin, saving
4826 stdin itself for later reading of expansion strings. */
4828 else if (expansion_test_message)
4830 int save_stdin = dup(0);
4831 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4833 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4836 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4837 message_ended = END_NOTENDED;
4838 read_message_body(receive_msg(extract_recipients));
4839 message_linecount += body_linecount;
4840 (void)dup2(save_stdin, 0);
4841 (void)close(save_stdin);
4842 clearerr(stdin); /* Required by Darwin */
4845 /* Only admin users may see config-file macros this way */
4847 if (!f.admin_user) macros_user = macros = mlast = NULL;
4849 /* Allow $recipients for this testing */
4851 f.enable_dollar_recipients = TRUE;
4853 /* Expand command line items */
4855 if (recipients_arg < argc)
4856 while (recipients_arg < argc)
4857 expansion_test_line(argv[recipients_arg++]);
4863 char *(*fn_readline)(const char *) = NULL;
4864 void (*fn_addhist)(const char *) = NULL;
4868 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4871 while (s = get_stdinput(fn_readline, fn_addhist))
4872 expansion_test_line(s);
4875 if (dlhandle) dlclose(dlhandle);
4879 /* The data file will be open after -Mset */
4881 if (deliver_datafile >= 0)
4883 (void)close(deliver_datafile);
4884 deliver_datafile = -1;
4887 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4891 /* The active host name is normally the primary host name, but it can be varied
4892 for hosts that want to play several parts at once. We need to ensure that it is
4893 set for host checking, and for receiving messages. */
4895 smtp_active_hostname = primary_hostname;
4896 if (raw_active_hostname != NULL)
4898 uschar *nah = expand_string(raw_active_hostname);
4901 if (!f.expand_string_forcedfail)
4902 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4903 "(smtp_active_hostname): %s", raw_active_hostname,
4904 expand_string_message);
4906 else if (nah[0] != 0) smtp_active_hostname = nah;
4909 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4910 given IP address so that the blocking and relay configuration can be tested.
4911 Unless a sender_ident was set by -oMt, we discard it (the default is the
4912 caller's login name). An RFC 1413 call is made only if we are running in the
4913 test harness and an incoming interface and both ports are specified, because
4914 there is no TCP/IP call to find the ident for. */
4921 if (!sender_ident_set)
4923 sender_ident = NULL;
4924 if (f.running_in_test_harness && sender_host_port != 0 &&
4925 interface_address != NULL && interface_port != 0)
4926 verify_get_ident(1413);
4929 /* In case the given address is a non-canonical IPv6 address, canonicalize
4930 it. The code works for both IPv4 and IPv6, as it happens. */
4932 size = host_aton(sender_host_address, x);
4933 sender_host_address = store_get(48); /* large enough for full IPv6 */
4934 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4936 /* Now set up for testing */
4938 host_build_sender_fullhost();
4942 f.sender_local = FALSE;
4943 f.sender_host_notsocket = TRUE;
4944 debug_file = stderr;
4945 debug_fd = fileno(debug_file);
4946 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4947 "**** but without any ident (RFC 1413) callback.\n"
4948 "**** This is not for real!\n\n",
4949 sender_host_address);
4951 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4952 if (verify_check_host(&hosts_connection_nolog) == OK)
4953 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4954 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4956 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4957 because a log line has already been written for all its failure exists
4958 (usually "connection refused: <reason>") and writing another one is
4959 unnecessary clutter. */
4961 if (smtp_start_session())
4963 for (reset_point = store_get(0); ; store_reset(reset_point))
4965 if (smtp_setup_msg() <= 0) break;
4966 if (!receive_msg(FALSE)) break;
4968 return_path = sender_address = NULL;
4969 dnslist_domain = dnslist_matched = NULL;
4970 #ifndef DISABLE_DKIM
4971 dkim_cur_signer = NULL;
4974 deliver_localpart_orig = NULL;
4975 deliver_domain_orig = NULL;
4976 callout_address = sending_ip_address = NULL;
4977 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4981 exim_exit(EXIT_SUCCESS, US"main");
4985 /* Arrange for message reception if recipients or SMTP were specified;
4986 otherwise complain unless a version print (-bV) happened or this is a filter
4987 verification test or info dump.
4988 In the former case, show the configuration file name. */
4990 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4992 if (version_printed)
4994 if (Ustrchr(config_main_filelist, ':'))
4995 printf("Configuration file search path is %s\n", config_main_filelist);
4996 printf("Configuration file is %s\n", config_main_filename);
4997 return EXIT_SUCCESS;
5000 if (info_flag != CMDINFO_NONE)
5002 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5003 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5006 if (filter_test == FTEST_NONE)
5007 exim_usage(called_as);
5011 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5012 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5013 that we are not called from inetd, because that is rejected above. The
5014 following configuration settings are forced here:
5016 (1) Synchronous delivery (-odi)
5017 (2) Errors to stderr (-oep == -oeq)
5018 (3) No parallel remote delivery
5019 (4) Unprivileged delivery
5021 We don't force overall queueing options because there are several of them;
5022 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5023 to override any SMTP queueing. */
5027 f.synchronous_delivery = TRUE;
5028 arg_error_handling = ERRORS_STDERR;
5029 remote_max_parallel = 1;
5030 deliver_drop_privilege = TRUE;
5031 f.queue_smtp = FALSE;
5032 queue_smtp_domains = NULL;
5034 message_utf8_downconvert = -1; /* convert-if-needed */
5039 /* Prepare to accept one or more new messages on the standard input. When a
5040 message has been read, its id is returned in message_id[]. If doing immediate
5041 delivery, we fork a delivery process for each received message, except for the
5042 last one, where we can save a process switch.
5044 It is only in non-smtp mode that error_handling is allowed to be changed from
5045 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5046 sendmail error modes other than -oem ever actually used? Later: yes.) */
5048 if (!smtp_input) error_handling = arg_error_handling;
5050 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5051 logging being sent down the socket and make an identd call to get the
5054 else if (f.is_inetd)
5056 (void)fclose(stderr);
5057 exim_nullstd(); /* Re-open to /dev/null */
5058 verify_get_ident(IDENT_PORT);
5059 host_build_sender_fullhost();
5060 set_process_info("handling incoming connection from %s via inetd",
5064 /* If the sender host address has been set, build sender_fullhost if it hasn't
5065 already been done (which it will have been for inetd). This caters for the
5066 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5067 so that the test for IP options is skipped for -bs input. */
5069 if (sender_host_address && !sender_fullhost)
5071 host_build_sender_fullhost();
5072 set_process_info("handling incoming connection from %s via -oMa",
5074 f.sender_host_notsocket = TRUE;
5077 /* Otherwise, set the sender host as unknown except for inetd calls. This
5078 prevents host checking in the case of -bs not from inetd and also for -bS. */
5080 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5082 /* If stdout does not exist, then dup stdin to stdout. This can happen
5083 if exim is started from inetd. In this case fd 0 will be set to the socket,
5084 but fd 1 will not be set. This also happens for passed SMTP channels. */
5086 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5088 /* Set up the incoming protocol name and the state of the program. Root is
5089 allowed to force received protocol via the -oMr option above. If we have come
5090 via inetd, the process info has already been set up. We don't set
5091 received_protocol here for smtp input, as it varies according to
5092 batch/HELO/EHLO/AUTH/TLS. */
5096 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5097 smtp_batched_input? "batched " : "",
5098 (sender_address!= NULL)? sender_address : originator_login);
5102 int old_pool = store_pool;
5103 store_pool = POOL_PERM;
5104 if (!received_protocol)
5105 received_protocol = string_sprintf("local%s", called_as);
5106 store_pool = old_pool;
5107 set_process_info("accepting a local non-SMTP message from <%s>",
5111 /* Initialize the session_local_queue-only flag (this will be ignored if
5112 mua_wrapper is set) */
5115 session_local_queue_only = queue_only;
5117 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5118 the spool if so configured. On failure, we must not attempt to send an error
5119 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5120 error code is given.) */
5122 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5123 exim_fail("exim: insufficient disk space\n");
5125 /* If this is smtp input of any kind, real or batched, handle the start of the
5128 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5129 because a log line has already been written for all its failure exists
5130 (usually "connection refused: <reason>") and writing another one is
5131 unnecessary clutter. */
5137 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5138 if (verify_check_host(&hosts_connection_nolog) == OK)
5139 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5140 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5141 if (!smtp_start_session())
5144 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5148 /* Otherwise, set up the input size limit here. */
5152 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5153 if (expand_string_message)
5154 if (thismessage_size_limit == -1)
5155 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5156 "message_size_limit: %s", expand_string_message);
5158 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5159 "message_size_limit: %s", expand_string_message);
5162 /* Loop for several messages when reading SMTP input. If we fork any child
5163 processes, we don't want to wait for them unless synchronous delivery is
5164 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5165 same as SIG_DFL, despite the fact that documentation often lists the default as
5166 "ignore". This is a confusing area. This is what I know:
5168 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5169 processes that complete simply to go away without ever becoming defunct. You
5170 can't then wait for them - but we don't want to wait for them in the
5171 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5172 happen for all OS (e.g. *BSD is different).
5174 But that's not the end of the story. Some (many? all?) systems have the
5175 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5176 has by default, so it seems that the difference is merely one of default
5177 (compare restarting vs non-restarting signals).
5179 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5180 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5181 of the loop below. Paranoia rules.
5183 February 2003: That's *still* not the end of the story. There are now versions
5184 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5185 process then calls waitpid(), a grumble is written to the system log, because
5186 this is logically inconsistent. In other words, it doesn't like the paranoia.
5187 As a consequence of this, the waitpid() below is now excluded if we are sure
5188 that SIG_IGN works. */
5190 if (!f.synchronous_delivery)
5193 struct sigaction act;
5194 act.sa_handler = SIG_IGN;
5195 sigemptyset(&(act.sa_mask));
5196 act.sa_flags = SA_NOCLDWAIT;
5197 sigaction(SIGCHLD, &act, NULL);
5199 signal(SIGCHLD, SIG_IGN);
5203 /* Save the current store pool point, for resetting at the start of
5204 each message, and save the real sender address, if any. */
5206 reset_point = store_get(0);
5207 real_sender_address = sender_address;
5209 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5210 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5217 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5218 input and build the recipients list, before calling receive_msg() to read the
5219 message proper. Whatever sender address is given in the SMTP transaction is
5220 often ignored for local senders - we use the actual sender, which is normally
5221 either the underlying user running this process or a -f argument provided by
5222 a trusted caller. It is saved in real_sender_address. The test for whether to
5223 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5228 if ((rc = smtp_setup_msg()) > 0)
5230 if (real_sender_address != NULL &&
5231 !receive_check_set_sender(sender_address))
5233 sender_address = raw_sender = real_sender_address;
5234 sender_address_unrewritten = NULL;
5237 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5238 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5239 the very end. The result of the ACL is ignored (as for other non-SMTP
5240 messages). It is run for its potential side effects. */
5242 if (smtp_batched_input && acl_not_smtp_start != NULL)
5244 uschar *user_msg, *log_msg;
5245 f.enable_dollar_recipients = TRUE;
5246 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5247 &user_msg, &log_msg);
5248 f.enable_dollar_recipients = FALSE;
5251 /* Now get the data for the message */
5253 more = receive_msg(extract_recipients);
5254 if (message_id[0] == 0)
5256 cancel_cutthrough_connection(TRUE, US"receive dropped");
5257 if (more) goto moreloop;
5258 smtp_log_no_mail(); /* Log no mail if configured */
5259 exim_exit(EXIT_FAILURE, US"receive toplevel");
5264 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5265 smtp_log_no_mail(); /* Log no mail if configured */
5266 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5270 /* In the non-SMTP case, we have all the information from the command
5271 line, but must process it in case it is in the more general RFC822
5272 format, and in any case, to detect syntax errors. Also, it appears that
5273 the use of comma-separated lists as single arguments is common, so we
5274 had better support them. */
5280 int count = argc - recipients_arg;
5281 uschar **list = argv + recipients_arg;
5283 /* These options cannot be changed dynamically for non-SMTP messages */
5285 f.active_local_sender_retain = local_sender_retain;
5286 f.active_local_from_check = local_from_check;
5288 /* Save before any rewriting */
5290 raw_sender = string_copy(sender_address);
5292 /* Loop for each argument */
5294 for (i = 0; i < count; i++)
5296 int start, end, domain;
5298 uschar *s = list[i];
5300 /* Loop for each comma-separated address */
5304 BOOL finished = FALSE;
5306 uschar *ss = parse_find_address_end(s, FALSE);
5308 if (*ss == ',') *ss = 0; else finished = TRUE;
5310 /* Check max recipients - if -t was used, these aren't recipients */
5312 if (recipients_max > 0 && ++rcount > recipients_max &&
5313 !extract_recipients)
5314 if (error_handling == ERRORS_STDERR)
5316 fprintf(stderr, "exim: too many recipients\n");
5317 exim_exit(EXIT_FAILURE, US"main");
5321 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5322 errors_sender_rc : EXIT_FAILURE;
5326 BOOL b = allow_utf8_domains;
5327 allow_utf8_domains = TRUE;
5330 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5333 if (string_is_utf8(recipient))
5334 message_smtputf8 = TRUE;
5336 allow_utf8_domains = b;
5339 if (domain == 0 && !f.allow_unqualified_recipient)
5342 errmess = US"unqualified recipient address not allowed";
5345 if (recipient == NULL)
5347 if (error_handling == ERRORS_STDERR)
5349 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5350 string_printing(list[i]), errmess);
5351 exim_exit(EXIT_FAILURE, US"main");
5357 eblock.text1 = string_printing(list[i]);
5358 eblock.text2 = errmess;
5360 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5361 errors_sender_rc : EXIT_FAILURE;
5365 receive_add_recipient(recipient, -1);
5368 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5372 /* Show the recipients when debugging */
5377 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5378 if (recipients_list != NULL)
5380 debug_printf("Recipients:\n");
5381 for (i = 0; i < recipients_count; i++)
5382 debug_printf(" %s\n", recipients_list[i].address);
5386 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5387 ignored; rejecting here would just add complication, and it can just as
5388 well be done later. Allow $recipients to be visible in the ACL. */
5390 if (acl_not_smtp_start)
5392 uschar *user_msg, *log_msg;
5393 f.enable_dollar_recipients = TRUE;
5394 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5395 &user_msg, &log_msg);
5396 f.enable_dollar_recipients = FALSE;
5399 /* Pause for a while waiting for input. If none received in that time,
5400 close the logfile, if we had one open; then if we wait for a long-running
5401 datasource (months, in one use-case) log rotation will not leave us holding
5404 if (!receive_timeout)
5406 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5409 FD_ZERO(&r); FD_SET(0, &r);
5410 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5413 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5414 will just read the headers for the message, and not write anything onto the
5417 message_ended = END_NOTENDED;
5418 more = receive_msg(extract_recipients);
5420 /* more is always FALSE here (not SMTP message) when reading a message
5421 for real; when reading the headers of a message for filter testing,
5422 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5424 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5425 } /* Non-SMTP message reception */
5427 /* If this is a filter testing run, there are headers in store, but
5428 no message on the spool. Run the filtering code in testing mode, setting
5429 the domain to the qualify domain and the local part to the current user,
5430 unless they have been set by options. The prefix and suffix are left unset
5431 unless specified. The the return path is set to to the sender unless it has
5432 already been set from a return-path header in the message. */
5434 if (filter_test != FTEST_NONE)
5436 deliver_domain = (ftest_domain != NULL)?
5437 ftest_domain : qualify_domain_recipient;
5438 deliver_domain_orig = deliver_domain;
5439 deliver_localpart = (ftest_localpart != NULL)?
5440 ftest_localpart : originator_login;
5441 deliver_localpart_orig = deliver_localpart;
5442 deliver_localpart_prefix = ftest_prefix;
5443 deliver_localpart_suffix = ftest_suffix;
5444 deliver_home = originator_home;
5446 if (return_path == NULL)
5448 printf("Return-path copied from sender\n");
5449 return_path = string_copy(sender_address);
5452 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5453 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5455 receive_add_recipient(
5456 string_sprintf("%s%s%s@%s",
5457 (ftest_prefix == NULL)? US"" : ftest_prefix,
5459 (ftest_suffix == NULL)? US"" : ftest_suffix,
5460 deliver_domain), -1);
5462 printf("Recipient = %s\n", recipients_list[0].address);
5463 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5464 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5466 if (chdir("/")) /* Get away from wherever the user is running this from */
5468 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5469 exim_exit(EXIT_FAILURE, US"main");
5472 /* Now we run either a system filter test, or a user filter test, or both.
5473 In the latter case, headers added by the system filter will persist and be
5474 available to the user filter. We need to copy the filter variables
5477 if ((filter_test & FTEST_SYSTEM) != 0)
5478 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5479 exim_exit(EXIT_FAILURE, US"main");
5481 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5483 if ((filter_test & FTEST_USER) != 0)
5484 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5485 exim_exit(EXIT_FAILURE, US"main");
5487 exim_exit(EXIT_SUCCESS, US"main");
5490 /* Else act on the result of message reception. We should not get here unless
5491 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5492 will be TRUE. If it is not, check on the number of messages received in this
5495 if (!session_local_queue_only &&
5496 smtp_accept_queue_per_connection > 0 &&
5497 receive_messagecount > smtp_accept_queue_per_connection)
5499 session_local_queue_only = TRUE;
5500 queue_only_reason = 2;
5503 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5504 and queue_only_load is set, check that the load average is below it. If it is
5505 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5506 default), we put the whole session into queue_only mode. It then remains this
5507 way for any subsequent messages on the same SMTP connection. This is a
5508 deliberate choice; even though the load average may fall, it doesn't seem
5509 right to deliver later messages on the same call when not delivering earlier
5510 ones. However, there are odd cases where this is not wanted, so this can be
5511 changed by setting queue_only_load_latch false. */
5513 local_queue_only = session_local_queue_only;
5514 if (!local_queue_only && queue_only_load >= 0)
5516 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5517 if (local_queue_only)
5519 queue_only_reason = 3;
5520 if (queue_only_load_latch) session_local_queue_only = TRUE;
5524 /* If running as an MUA wrapper, all queueing options and freezing options
5528 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5530 /* Log the queueing here, when it will get a message id attached, but
5531 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5534 if (local_queue_only)
5536 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5537 switch(queue_only_reason)
5540 log_write(L_delay_delivery,
5541 LOG_MAIN, "no immediate delivery: more than %d messages "
5542 "received in one connection", smtp_accept_queue_per_connection);
5546 log_write(L_delay_delivery,
5547 LOG_MAIN, "no immediate delivery: load average %.2f",
5548 (double)load_average/1000.0);
5553 else if (f.queue_only_policy || f.deliver_freeze)
5554 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5556 /* Else do the delivery unless the ACL or local_scan() called for queue only
5557 or froze the message. Always deliver in a separate process. A fork failure is
5558 not a disaster, as the delivery will eventually happen on a subsequent queue
5559 run. The search cache must be tidied before the fork, as the parent will
5560 do it before exiting. The child will trigger a lookup failure and
5561 thereby defer the delivery if it tries to use (for example) a cached ldap
5562 connection that the parent has called unbind on. */
5569 if ((pid = fork()) == 0)
5572 close_unwanted(); /* Close unwanted file descriptors and TLS */
5573 exim_nullstd(); /* Ensure std{in,out,err} exist */
5575 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5576 mode, deliver_drop_privilege is forced TRUE). */
5578 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5580 delivery_re_exec(CEE_EXEC_EXIT);
5581 /* Control does not return here. */
5584 /* No need to re-exec */
5586 rc = deliver_message(message_id, FALSE, FALSE);
5588 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5589 EXIT_SUCCESS : EXIT_FAILURE);
5594 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5595 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5596 "process: %s", strerror(errno));
5600 release_cutthrough_connection(US"msg passed for delivery");
5602 /* In the parent, wait if synchronous delivery is required. This will
5603 always be the case in MUA wrapper mode. */
5605 if (f.synchronous_delivery)
5608 while (wait(&status) != pid);
5609 if ((status & 0x00ff) != 0)
5610 log_write(0, LOG_MAIN|LOG_PANIC,
5611 "process %d crashed with signal %d while delivering %s",
5612 (int)pid, status & 0x00ff, message_id);
5613 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5618 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5619 automatically reaps children (see comments above the loop), clear away any
5620 finished subprocesses here, in case there are lots of messages coming in
5621 from the same source. */
5623 #ifndef SIG_IGN_WORKS
5624 while (waitpid(-1, NULL, WNOHANG) > 0);
5628 return_path = sender_address = NULL;
5629 authenticated_sender = NULL;
5630 deliver_localpart_orig = NULL;
5631 deliver_domain_orig = NULL;
5632 deliver_host = deliver_host_address = NULL;
5633 dnslist_domain = dnslist_matched = NULL;
5634 #ifdef WITH_CONTENT_SCAN
5635 malware_name = NULL;
5637 callout_address = NULL;
5638 sending_ip_address = NULL;
5640 { int i; for(i=0; i<REGEX_VARS; i++) regex_vars[i] = NULL; }
5642 store_reset(reset_point);
5645 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5646 return 0; /* To stop compiler warning */