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;
148 expand_nmax = setup < 0 ? 0 : setup + 1;
149 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
151 expand_nstring[expand_nmax] = s + ovector[nn];
152 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
162 /*************************************************
163 * Set up processing details *
164 *************************************************/
166 /* Save a text string for dumping when SIGUSR1 is received.
167 Do checks for overruns.
169 Arguments: format and arguments, as for printf()
174 set_process_info(const char *format, ...)
176 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
181 g = string_fmt_append(&gs, "%5d ", (int)getpid());
183 va_start(ap, format);
184 if (!string_vformat(g, FALSE, format, ap))
187 g = string_cat(&gs, US"**** string overflowed buffer ****");
189 g = string_catn(g, US"\n", 1);
190 string_from_gstring(g);
191 process_info_len = g->ptr;
192 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
196 /***********************************************
197 * Handler for SIGTERM *
198 ***********************************************/
201 term_handler(int sig)
207 /*************************************************
208 * Handler for SIGUSR1 *
209 *************************************************/
211 /* SIGUSR1 causes any exim process to write to the process log details of
212 what it is currently doing. It will only be used if the OS is capable of
213 setting up a handler that causes automatic restarting of any system call
214 that is in progress at the time.
216 This function takes care to be signal-safe.
218 Argument: the signal number (SIGUSR1)
223 usr1_handler(int sig)
227 os_restarting_signal(sig, usr1_handler);
229 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
231 /* If we are already running as the Exim user, try to create it in the
232 current process (assuming spool_directory exists). Otherwise, if we are
233 root, do the creation in an exim:exim subprocess. */
235 int euid = geteuid();
236 if (euid == exim_uid)
237 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
238 else if (euid == root_uid)
239 fd = log_create_as_exim(process_log_path);
242 /* If we are neither exim nor root, or if we failed to create the log file,
243 give up. There is not much useful we can do with errors, since we don't want
244 to disrupt whatever is going on outside the signal handler. */
248 (void)write(fd, process_info, process_info_len);
254 /*************************************************
256 *************************************************/
258 /* This handler is enabled most of the time that Exim is running. The handler
259 doesn't actually get used unless alarm() has been called to set a timer, to
260 place a time limit on a system call of some kind. When the handler is run, it
263 There are some other SIGALRM handlers that are used in special cases when more
264 than just a flag setting is required; for example, when reading a message's
265 input. These are normally set up in the code module that uses them, and the
266 SIGALRM handler is reset to this one afterwards.
268 Argument: the signal value (SIGALRM)
273 sigalrm_handler(int sig)
275 sig = sig; /* Keep picky compilers happy */
277 os_non_restarting_signal(SIGALRM, sigalrm_handler);
282 /*************************************************
283 * Sleep for a fractional time interval *
284 *************************************************/
286 /* This function is called by millisleep() and exim_wait_tick() to wait for a
287 period of time that may include a fraction of a second. The coding is somewhat
288 tedious. We do not expect setitimer() ever to fail, but if it does, the process
289 will wait for ever, so we panic in this instance. (There was a case of this
290 when a bug in a function that calls milliwait() caused it to pass invalid data.
291 That's when I added the check. :-)
293 We assume it to be not worth sleeping for under 100us; this value will
294 require revisiting as hardware advances. This avoids the issue of
295 a zero-valued timer setting meaning "never fire".
297 Argument: an itimerval structure containing the interval
302 milliwait(struct itimerval *itval)
305 sigset_t old_sigmask;
307 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
309 (void)sigemptyset(&sigmask); /* Empty mask */
310 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
311 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
312 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
313 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
314 "setitimer() failed: %s", strerror(errno));
315 (void)sigfillset(&sigmask); /* All signals */
316 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
317 (void)sigsuspend(&sigmask); /* Until SIGALRM */
318 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
324 /*************************************************
325 * Millisecond sleep function *
326 *************************************************/
328 /* The basic sleep() function has a granularity of 1 second, which is too rough
329 in some cases - for example, when using an increasing delay to slow down
332 Argument: number of millseconds
339 struct itimerval itval;
340 itval.it_interval.tv_sec = 0;
341 itval.it_interval.tv_usec = 0;
342 itval.it_value.tv_sec = msec/1000;
343 itval.it_value.tv_usec = (msec % 1000) * 1000;
349 /*************************************************
350 * Compare microsecond times *
351 *************************************************/
358 Returns: -1, 0, or +1
362 exim_tvcmp(struct timeval *t1, struct timeval *t2)
364 if (t1->tv_sec > t2->tv_sec) return +1;
365 if (t1->tv_sec < t2->tv_sec) return -1;
366 if (t1->tv_usec > t2->tv_usec) return +1;
367 if (t1->tv_usec < t2->tv_usec) return -1;
374 /*************************************************
375 * Clock tick wait function *
376 *************************************************/
378 /* Exim uses a time + a pid to generate a unique identifier in two places: its
379 message IDs, and in file names for maildir deliveries. Because some OS now
380 re-use pids within the same second, sub-second times are now being used.
381 However, for absolute certainty, we must ensure the clock has ticked before
382 allowing the relevant process to complete. At the time of implementation of
383 this code (February 2003), the speed of processors is such that the clock will
384 invariably have ticked already by the time a process has done its job. This
385 function prepares for the time when things are faster - and it also copes with
386 clocks that go backwards.
389 then_tv A timeval which was used to create uniqueness; its usec field
390 has been rounded down to the value of the resolution.
391 We want to be sure the current time is greater than this.
392 resolution The resolution that was used to divide the microseconds
393 (1 for maildir, larger for message ids)
399 exim_wait_tick(struct timeval *then_tv, int resolution)
401 struct timeval now_tv;
402 long int now_true_usec;
404 (void)gettimeofday(&now_tv, NULL);
405 now_true_usec = now_tv.tv_usec;
406 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
408 if (exim_tvcmp(&now_tv, then_tv) <= 0)
410 struct itimerval itval;
411 itval.it_interval.tv_sec = 0;
412 itval.it_interval.tv_usec = 0;
413 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
414 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
416 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
417 negative value for the microseconds is possible only in the case when "now"
418 is more than a second less than "then". That means that itval.it_value.tv_sec
419 is greater than zero. The following correction is therefore safe. */
421 if (itval.it_value.tv_usec < 0)
423 itval.it_value.tv_usec += 1000000;
424 itval.it_value.tv_sec -= 1;
427 DEBUG(D_transport|D_receive)
429 if (!f.running_in_test_harness)
431 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
432 then_tv->tv_sec, (long) then_tv->tv_usec,
433 now_tv.tv_sec, (long) now_tv.tv_usec);
434 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
435 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
446 /*************************************************
447 * Call fopen() with umask 777 and adjust mode *
448 *************************************************/
450 /* Exim runs with umask(0) so that files created with open() have the mode that
451 is specified in the open() call. However, there are some files, typically in
452 the spool directory, that are created with fopen(). They end up world-writeable
453 if no precautions are taken. Although the spool directory is not accessible to
454 the world, this is an untidiness. So this is a wrapper function for fopen()
455 that sorts out the mode of the created file.
458 filename the file name
459 options the fopen() options
460 mode the required mode
462 Returns: the fopened FILE or NULL
466 modefopen(const uschar *filename, const char *options, mode_t mode)
468 mode_t saved_umask = umask(0777);
469 FILE *f = Ufopen(filename, options);
470 (void)umask(saved_umask);
471 if (f != NULL) (void)fchmod(fileno(f), mode);
476 /*************************************************
477 * Ensure stdin, stdout, and stderr exist *
478 *************************************************/
480 /* Some operating systems grumble if an exec() happens without a standard
481 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
482 file will be opened and will use these fd values, and then some other bit of
483 code will assume, for example, that it can write error messages to stderr.
484 This function ensures that fds 0, 1, and 2 are open if they do not already
485 exist, by connecting them to /dev/null.
487 This function is also used to ensure that std{in,out,err} exist at all times,
488 so that if any library that Exim calls tries to use them, it doesn't crash.
499 for (int i = 0; i <= 2; i++)
501 if (fstat(i, &statbuf) < 0 && errno == EBADF)
503 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
504 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
505 string_open_failed(errno, "/dev/null"));
506 if (devnull != i) (void)dup2(devnull, i);
509 if (devnull > 2) (void)close(devnull);
515 /*************************************************
516 * Close unwanted file descriptors for delivery *
517 *************************************************/
519 /* This function is called from a new process that has been forked to deliver
520 an incoming message, either directly, or using exec.
522 We want any smtp input streams to be closed in this new process. However, it
523 has been observed that using fclose() here causes trouble. When reading in -bS
524 input, duplicate copies of messages have been seen. The files will be sharing a
525 file pointer with the parent process, and it seems that fclose() (at least on
526 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
527 least sometimes. Hence we go for closing the underlying file descriptors.
529 If TLS is active, we want to shut down the TLS library, but without molesting
530 the parent's SSL connection.
532 For delivery of a non-SMTP message, we want to close stdin and stdout (and
533 stderr unless debugging) because the calling process might have set them up as
534 pipes and be waiting for them to close before it waits for the submission
535 process to terminate. If they aren't closed, they hold up the calling process
536 until the initial delivery process finishes, which is not what we want.
538 Exception: We do want it for synchronous delivery!
540 And notwithstanding all the above, if D_resolver is set, implying resolver
541 debugging, leave stdout open, because that's where the resolver writes its
544 When we close stderr (which implies we've also closed stdout), we also get rid
545 of any controlling terminal.
557 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
559 (void)close(fileno(smtp_in));
560 (void)close(fileno(smtp_out));
565 (void)close(0); /* stdin */
566 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
567 if (debug_selector == 0) /* stderr */
569 if (!f.synchronous_delivery)
582 /*************************************************
584 *************************************************/
586 /* This function sets a new uid and gid permanently, optionally calling
587 initgroups() to set auxiliary groups. There are some special cases when running
588 Exim in unprivileged modes. In these situations the effective uid will not be
589 root; if we already have the right effective uid/gid, and don't need to
590 initialize any groups, leave things as they are.
595 igflag TRUE if initgroups() wanted
596 msg text to use in debugging output and failure log
598 Returns: nothing; bombs out on failure
602 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
604 uid_t euid = geteuid();
605 gid_t egid = getegid();
607 if (euid == root_uid || euid != uid || egid != gid || igflag)
609 /* At least one OS returns +1 for initgroups failure, so just check for
614 struct passwd *pw = getpwuid(uid);
616 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
617 "no passwd entry for uid=%ld", (long int)uid);
619 if (initgroups(pw->pw_name, gid) != 0)
620 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
621 (long int)uid, strerror(errno));
624 if (setgid(gid) < 0 || setuid(uid) < 0)
625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
626 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
629 /* Debugging output included uid/gid and all groups */
633 int group_count, save_errno;
634 gid_t group_list[EXIM_GROUPLIST_SIZE];
635 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
636 (long int)geteuid(), (long int)getegid(), (long int)getpid());
637 group_count = getgroups(nelem(group_list), group_list);
639 debug_printf(" auxiliary group list:");
641 for (int 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);
688 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
689 of chown()/fchown(). See src/functions.h for more explanation */
691 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
693 int saved_errno = errno; /* from the preceeding chown call */
695 log_write(0, LOG_MAIN|LOG_PANIC,
696 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
697 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
698 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
700 /* I leave this here, commented, in case the "bug"(?) comes up again.
701 It is not an Exim bug, but we can provide a workaround.
707 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
709 if (buf.st_uid == owner && buf.st_gid == group) return 0;
710 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
712 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
720 /*************************************************
721 * Extract port from host address *
722 *************************************************/
724 /* Called to extract the port from the values given to -oMa and -oMi.
725 It also checks the syntax of the address, and terminates it before the
726 port data when a port is extracted.
729 address the address, with possible port on the end
731 Returns: the port, or zero if there isn't one
732 bombs out on a syntax error
736 check_port(uschar *address)
738 int port = host_address_extract_port(address);
739 if (string_is_ip_address(address, NULL) == 0)
740 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
746 /*************************************************
747 * Test/verify an address *
748 *************************************************/
750 /* This function is called by the -bv and -bt code. It extracts a working
751 address from a full RFC 822 address. This isn't really necessary per se, but it
752 has the effect of collapsing source routes.
756 flags flag bits for verify_address()
757 exit_value to be set for failures
763 test_address(uschar *s, int flags, int *exit_value)
765 int start, end, domain;
766 uschar *parse_error = NULL;
767 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
771 fprintf(stdout, "syntax error: %s\n", parse_error);
776 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
777 -1, -1, NULL, NULL, NULL);
778 if (rc == FAIL) *exit_value = 2;
779 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
785 /*************************************************
786 * Show supported features *
787 *************************************************/
790 show_db_version(FILE * f)
792 #ifdef DB_VERSION_STRING
795 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
796 fprintf(f, " Runtime: %s\n",
797 db_version(NULL, NULL, NULL));
800 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
802 #elif defined(BTREEVERSION) && defined(HASHVERSION)
804 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
806 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
809 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
810 fprintf(f, "Probably ndbm\n");
811 #elif defined(USE_TDB)
812 fprintf(f, "Using tdb\n");
815 fprintf(f, "Probably GDBM (native mode)\n");
817 fprintf(f, "Probably GDBM (compatibility mode)\n");
823 /* This function is called for -bV/--version and for -d to output the optional
824 features of the current Exim binary.
826 Arguments: a FILE for printing
831 show_whats_supported(FILE * fp)
833 DEBUG(D_any) {} else show_db_version(fp);
835 fprintf(fp, "Support for:");
836 #ifdef SUPPORT_CRYPTEQ
837 fprintf(fp, " crypteq");
840 fprintf(fp, " iconv()");
843 fprintf(fp, " IPv6");
845 #ifdef HAVE_SETCLASSRESOURCES
846 fprintf(fp, " use_setclassresources");
852 fprintf(fp, " Perl");
855 fprintf(fp, " Expand_dlfunc");
857 #ifdef USE_TCP_WRAPPERS
858 fprintf(fp, " TCPwrappers");
861 fprintf(fp, " GnuTLS");
864 fprintf(fp, " OpenSSL");
866 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
867 fprintf(fp, " translate_ip_address");
869 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
870 fprintf(fp, " move_frozen_messages");
872 #ifdef WITH_CONTENT_SCAN
873 fprintf(fp, " Content_Scanning");
876 fprintf(fp, " DANE");
879 fprintf(fp, " DKIM");
881 #ifndef DISABLE_DNSSEC
882 fprintf(fp, " DNSSEC");
884 #ifndef DISABLE_EVENT
885 fprintf(fp, " Event");
888 fprintf(fp, " I18N");
891 fprintf(fp, " OCSP");
893 #ifdef SUPPORT_PIPE_CONNECT
894 fprintf(fp, " PIPE_CONNECT");
897 fprintf(fp, " PRDR");
900 fprintf(fp, " PROXY");
903 fprintf(fp, " SOCKS");
910 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
912 #ifdef EXPERIMENTAL_LMDB
913 fprintf(fp, " Experimental_LMDB");
915 #ifdef EXPERIMENTAL_QUEUEFILE
916 fprintf(fp, " Experimental_QUEUEFILE");
918 #ifdef EXPERIMENTAL_SRS
919 fprintf(fp, " Experimental_SRS");
921 #ifdef EXPERIMENTAL_ARC
922 fprintf(fp, " Experimental_ARC");
924 #ifdef EXPERIMENTAL_BRIGHTMAIL
925 fprintf(fp, " Experimental_Brightmail");
927 #ifdef EXPERIMENTAL_DCC
928 fprintf(fp, " Experimental_DCC");
930 #ifdef EXPERIMENTAL_DMARC
931 fprintf(fp, " Experimental_DMARC");
933 #ifdef EXPERIMENTAL_DSN_INFO
934 fprintf(fp, " Experimental_DSN_info");
936 #ifdef EXPERIMENTAL_TLS_RESUME
937 fprintf(fp, " Experimental_TLS_resume");
941 fprintf(fp, "Lookups (built-in):");
942 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
943 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
945 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
948 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
949 fprintf(fp, " dbm dbmjz dbmnz");
951 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
952 fprintf(fp, " dnsdb");
954 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
955 fprintf(fp, " dsearch");
957 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
958 fprintf(fp, " ibase");
960 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
961 fprintf(fp, " json");
963 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
964 fprintf(fp, " ldap ldapdn ldapm");
966 #ifdef EXPERIMENTAL_LMDB
967 fprintf(fp, " lmdb");
969 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
970 fprintf(fp, " mysql");
972 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
973 fprintf(fp, " nis nis0");
975 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
976 fprintf(fp, " nisplus");
978 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
979 fprintf(fp, " oracle");
981 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
982 fprintf(fp, " passwd");
984 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
985 fprintf(fp, " pgsql");
987 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
988 fprintf(fp, " redis");
990 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
991 fprintf(fp, " sqlite");
993 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
994 fprintf(fp, " testdb");
996 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
997 fprintf(fp, " whoson");
1001 auth_show_supported(fp);
1002 route_show_supported(fp);
1003 transport_show_supported(fp);
1005 #ifdef WITH_CONTENT_SCAN
1006 malware_show_supported(fp);
1009 if (fixed_never_users[0] > 0)
1012 fprintf(fp, "Fixed never_users: ");
1013 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1014 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
1015 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
1018 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
1020 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1022 /* Everything else is details which are only worth reporting when debugging.
1023 Perhaps the tls_version_report should move into this too. */
1026 /* clang defines __GNUC__ (at least, for me) so test for it first */
1027 #if defined(__clang__)
1028 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1029 #elif defined(__GNUC__)
1030 fprintf(fp, "Compiler: GCC [%s]\n",
1034 "? unknown version ?"
1038 fprintf(fp, "Compiler: <unknown>\n");
1041 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1042 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1043 __GLIBC__, __GLIBC_MINOR__);
1044 if (__GLIBC_PREREQ(2, 1))
1045 fprintf(fp, " Runtime: %s\n",
1046 gnu_get_libc_version());
1049 show_db_version(fp);
1052 tls_version_report(fp);
1055 utf8_version_report(fp);
1058 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1059 if (authi->version_report)
1060 (*authi->version_report)(fp);
1062 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1063 characters; unless it's an ancient version of PCRE in which case it
1065 #ifndef PCRE_PRERELEASE
1066 # define PCRE_PRERELEASE
1069 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1070 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1072 PCRE_MAJOR, PCRE_MINOR,
1073 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1076 #undef EXPAND_AND_QUOTE
1079 for (int i = 0; i < lookup_list_count; i++)
1080 if (lookup_list[i]->version_report)
1081 lookup_list[i]->version_report(fp);
1083 #ifdef WHITELIST_D_MACROS
1084 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1086 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1088 #ifdef TRUSTED_CONFIG_LIST
1089 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1091 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1098 /*************************************************
1099 * Show auxiliary information about Exim *
1100 *************************************************/
1103 show_exim_information(enum commandline_info request, FILE *stream)
1108 fprintf(stream, "Oops, something went wrong.\n");
1112 "The -bI: flag takes a string indicating which information to provide.\n"
1113 "If the string is not recognised, you'll get this help (on stderr).\n"
1115 " exim -bI:help this information\n"
1116 " exim -bI:dscp list of known dscp value keywords\n"
1117 " exim -bI:sieve list of supported sieve extensions\n"
1121 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1122 fprintf(stream, "%s\n", *pp);
1125 dscp_list_to_stream(stream);
1131 /*************************************************
1132 * Quote a local part *
1133 *************************************************/
1135 /* This function is used when a sender address or a From: or Sender: header
1136 line is being created from the caller's login, or from an authenticated_id. It
1137 applies appropriate quoting rules for a local part.
1139 Argument: the local part
1140 Returns: the local part, quoted if necessary
1144 local_part_quote(uschar *lpart)
1146 BOOL needs_quote = FALSE;
1149 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1151 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1152 (*t != '.' || t == lpart || t[1] == 0);
1155 if (!needs_quote) return lpart;
1157 g = string_catn(NULL, US"\"", 1);
1161 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1164 g = string_cat(g, lpart);
1167 g = string_catn(g, lpart, nq - lpart);
1168 g = string_catn(g, US"\\", 1);
1169 g = string_catn(g, nq, 1);
1173 g = string_catn(g, US"\"", 1);
1174 return string_from_gstring(g);
1180 /*************************************************
1181 * Load readline() functions *
1182 *************************************************/
1184 /* This function is called from testing executions that read data from stdin,
1185 but only when running as the calling user. Currently, only -be does this. The
1186 function loads the readline() function library and passes back the functions.
1187 On some systems, it needs the curses library, so load that too, but try without
1188 it if loading fails. All this functionality has to be requested at build time.
1191 fn_readline_ptr pointer to where to put the readline pointer
1192 fn_addhist_ptr pointer to where to put the addhistory function
1194 Returns: the dlopen handle or NULL on failure
1198 set_readline(char * (**fn_readline_ptr)(const char *),
1199 void (**fn_addhist_ptr)(const char *))
1202 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1204 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1205 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1207 if (dlhandle != NULL)
1209 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1210 * char * readline (const char *prompt);
1211 * void add_history (const char *string);
1213 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1214 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1218 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1227 /*************************************************
1228 * Get a line from stdin for testing things *
1229 *************************************************/
1231 /* This function is called when running tests that can take a number of lines
1232 of input (for example, -be and -bt). It handles continuations and trailing
1233 spaces. And prompting and a blank line output on eof. If readline() is in use,
1234 the arguments are non-NULL and provide the relevant functions.
1237 fn_readline readline function or NULL
1238 fn_addhist addhist function or NULL
1240 Returns: pointer to dynamic memory, or NULL at end of file
1244 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1248 if (!fn_readline) { printf("> "); fflush(stdout); }
1250 for (int i = 0;; i++)
1252 uschar buffer[1024];
1256 char *readline_line = NULL;
1257 if (fn_readline != NULL)
1259 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1260 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1261 p = US readline_line;
1266 /* readline() not in use */
1269 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1273 /* Handle the line */
1275 ss = p + (int)Ustrlen(p);
1276 while (ss > p && isspace(ss[-1])) ss--;
1280 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1283 g = string_catn(g, p, ss - p);
1286 if (fn_readline) free(readline_line);
1289 /* g can only be NULL if ss==p */
1290 if (ss == p || g->s[g->ptr-1] != '\\')
1294 (void) string_from_gstring(g);
1297 if (!g) printf("\n");
1298 return string_from_gstring(g);
1303 /*************************************************
1304 * Output usage information for the program *
1305 *************************************************/
1307 /* This function is called when there are no recipients
1308 or a specific --help argument was added.
1311 progname information on what name we were called by
1313 Returns: DOES NOT RETURN
1317 exim_usage(uschar *progname)
1320 /* Handle specific program invocation variants */
1321 if (Ustrcmp(progname, US"-mailq") == 0)
1323 "mailq - list the contents of the mail queue\n\n"
1324 "For a list of options, see the Exim documentation.\n");
1326 /* Generic usage - we output this whatever happens */
1328 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1329 "not directly from a shell command line. Options and/or arguments control\n"
1330 "what it does when called. For a list of options, see the Exim documentation.\n");
1335 /*************************************************
1336 * Validate that the macros given are okay *
1337 *************************************************/
1339 /* Typically, Exim will drop privileges if macros are supplied. In some
1340 cases, we want to not do so.
1342 Arguments: opt_D_used - true if the commandline had a "-D" option
1343 Returns: true if trusted, false otherwise
1347 macros_trusted(BOOL opt_D_used)
1349 #ifdef WHITELIST_D_MACROS
1350 uschar *whitelisted, *end, *p, **whites;
1351 int white_count, i, n;
1353 BOOL prev_char_item, found;
1358 #ifndef WHITELIST_D_MACROS
1362 /* We only trust -D overrides for some invoking users:
1363 root, the exim run-time user, the optional config owner user.
1364 I don't know why config-owner would be needed, but since they can own the
1365 config files anyway, there's no security risk to letting them override -D. */
1366 if ( ! ((real_uid == root_uid)
1367 || (real_uid == exim_uid)
1368 #ifdef CONFIGURE_OWNER
1369 || (real_uid == config_uid)
1373 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1377 /* Get a list of macros which are whitelisted */
1378 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1379 prev_char_item = FALSE;
1381 for (p = whitelisted; *p != '\0'; ++p)
1383 if (*p == ':' || isspace(*p))
1388 prev_char_item = FALSE;
1391 if (!prev_char_item)
1392 prev_char_item = TRUE;
1399 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1400 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1405 if (i == white_count)
1407 while (*p != '\0' && p < end)
1413 /* The list of commandline macros should be very short.
1414 Accept the N*M complexity. */
1415 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1418 for (uschar ** w = whites; *w; ++w)
1419 if (Ustrcmp(*w, m->name) == 0)
1426 if (!m->replacement)
1428 if ((len = m->replen) == 0)
1430 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1431 0, PCRE_EOPT, NULL, 0);
1434 if (n != PCRE_ERROR_NOMATCH)
1435 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1439 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1445 /*************************************************
1446 * Expansion testing *
1447 *************************************************/
1449 /* Expand and print one item, doing macro-processing.
1452 item line for expansion
1456 expansion_test_line(uschar * line)
1461 Ustrncpy(big_buffer, line, big_buffer_size);
1462 big_buffer[big_buffer_size-1] = '\0';
1463 len = Ustrlen(big_buffer);
1465 (void) macros_expand(0, &len, &dummy_macexp);
1467 if (isupper(big_buffer[0]))
1469 if (macro_read_assignment(big_buffer))
1470 printf("Defined macro '%s'\n", mlast->name);
1473 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1474 else printf("Failed: %s\n", expand_string_message);
1479 /*************************************************
1480 * Entry point and high-level code *
1481 *************************************************/
1483 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1484 the appropriate action. All the necessary functions are present in the one
1485 binary. I originally thought one should split it up, but it turns out that so
1486 much of the apparatus is needed in each chunk that one might as well just have
1487 it all available all the time, which then makes the coding easier as well.
1490 argc count of entries in argv
1491 argv argument strings, with argv[0] being the program name
1493 Returns: EXIT_SUCCESS if terminated successfully
1494 EXIT_FAILURE otherwise, except when a message has been sent
1495 to the sender, and -oee was given
1499 main(int argc, char **cargv)
1501 uschar **argv = USS cargv;
1502 int arg_receive_timeout = -1;
1503 int arg_smtp_receive_timeout = -1;
1504 int arg_error_handling = error_handling;
1505 int filter_sfd = -1;
1506 int filter_ufd = -1;
1509 int list_queue_option = 0;
1511 int msg_action_arg = -1;
1512 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1513 int queue_only_reason = 0;
1515 int perl_start_option = 0;
1517 int recipients_arg = argc;
1518 int sender_address_domain = 0;
1519 int test_retry_arg = -1;
1520 int test_rewrite_arg = -1;
1521 gid_t original_egid;
1522 BOOL arg_queue_only = FALSE;
1523 BOOL bi_option = FALSE;
1524 BOOL checking = FALSE;
1525 BOOL count_queue = FALSE;
1526 BOOL expansion_test = FALSE;
1527 BOOL extract_recipients = FALSE;
1528 BOOL flag_G = FALSE;
1529 BOOL flag_n = FALSE;
1530 BOOL forced_delivery = FALSE;
1531 BOOL f_end_dot = FALSE;
1532 BOOL deliver_give_up = FALSE;
1533 BOOL list_queue = FALSE;
1534 BOOL list_options = FALSE;
1535 BOOL list_config = FALSE;
1536 BOOL local_queue_only;
1538 BOOL one_msg_action = FALSE;
1539 BOOL opt_D_used = FALSE;
1540 BOOL queue_only_set = FALSE;
1541 BOOL receiving_message = TRUE;
1542 BOOL sender_ident_set = FALSE;
1543 BOOL session_local_queue_only;
1545 BOOL removed_privilege = FALSE;
1546 BOOL usage_wanted = FALSE;
1547 BOOL verify_address_mode = FALSE;
1548 BOOL verify_as_sender = FALSE;
1549 BOOL version_printed = FALSE;
1550 uschar *alias_arg = NULL;
1551 uschar *called_as = US"";
1552 uschar *cmdline_syslog_name = NULL;
1553 uschar *start_queue_run_id = NULL;
1554 uschar *stop_queue_run_id = NULL;
1555 uschar *expansion_test_message = NULL;
1556 uschar *ftest_domain = NULL;
1557 uschar *ftest_localpart = NULL;
1558 uschar *ftest_prefix = NULL;
1559 uschar *ftest_suffix = NULL;
1560 uschar *log_oneline = NULL;
1561 uschar *malware_test_file = NULL;
1562 uschar *real_sender_address;
1563 uschar *originator_home = US"/";
1568 struct stat statbuf;
1569 pid_t passed_qr_pid = (pid_t)0;
1570 int passed_qr_pipe = -1;
1571 gid_t group_list[EXIM_GROUPLIST_SIZE];
1573 /* For the -bI: flag */
1574 enum commandline_info info_flag = CMDINFO_NONE;
1575 BOOL info_stdout = FALSE;
1577 /* Possible options for -R and -S */
1579 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1581 /* Need to define this in case we need to change the environment in order
1582 to get rid of a bogus time zone. We have to make it char rather than uschar
1583 because some OS define it in /usr/include/unistd.h. */
1585 extern char **environ;
1587 /* If the Exim user and/or group and/or the configuration file owner/group were
1588 defined by ref:name at build time, we must now find the actual uid/gid values.
1589 This is a feature to make the lives of binary distributors easier. */
1591 #ifdef EXIM_USERNAME
1592 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1595 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1597 /* If ref:name uses a number as the name, route_finduser() returns
1598 TRUE with exim_uid set and pw coerced to NULL. */
1600 exim_gid = pw->pw_gid;
1601 #ifndef EXIM_GROUPNAME
1604 "exim: ref:name should specify a usercode, not a group.\n"
1605 "exim: can't let you get away with it unless you also specify a group.\n");
1609 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1612 #ifdef EXIM_GROUPNAME
1613 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1614 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1617 #ifdef CONFIGURE_OWNERNAME
1618 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1619 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1620 CONFIGURE_OWNERNAME);
1623 /* We default the system_filter_user to be the Exim run-time user, as a
1624 sane non-root value. */
1625 system_filter_uid = exim_uid;
1627 #ifdef CONFIGURE_GROUPNAME
1628 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1629 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1630 CONFIGURE_GROUPNAME);
1633 /* In the Cygwin environment, some initialization used to need doing.
1634 It was fudged in by means of this macro; now no longer but we'll leave
1635 it in case of others. */
1641 /* Check a field which is patched when we are running Exim within its
1642 testing harness; do a fast initial check, and then the whole thing. */
1644 f.running_in_test_harness =
1645 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1646 if (f.running_in_test_harness)
1649 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1650 at the start of a program; however, it seems that some environments do not
1651 follow this. A "strange" locale can affect the formatting of timestamps, so we
1654 setlocale(LC_ALL, "C");
1656 /* Set up the default handler for timing using alarm(). */
1658 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1660 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1661 because store_malloc writes a log entry on failure. */
1663 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1664 exim_fail("exim: failed to get store for log buffer\n");
1666 /* Initialize the default log options. */
1668 bits_set(log_selector, log_selector_size, log_default);
1670 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1671 NULL when the daemon is run and the file is closed. We have to use this
1672 indirection, because some systems don't allow writing to the variable "stderr".
1675 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1677 /* Arrange for the PCRE regex library to use our store functions. Note that
1678 the normal calls are actually macros that add additional arguments for
1679 debugging purposes so we have to assign specially constructed functions here.
1680 The default is to use store in the stacking pool, but this is overridden in the
1681 regex_must_compile() function. */
1683 pcre_malloc = function_store_get;
1684 pcre_free = function_dummy_free;
1686 /* Ensure there is a big buffer for temporary use in several places. It is put
1687 in malloc store so that it can be freed for enlargement if necessary. */
1689 big_buffer = store_malloc(big_buffer_size);
1691 /* Set up the handler for the data request signal, and set the initial
1692 descriptive text. */
1694 set_process_info("initializing");
1695 os_restarting_signal(SIGUSR1, usr1_handler);
1697 /* If running in a dockerized environment, the TERM signal is only
1698 delegated to the PID 1 if we request it by setting an signal handler */
1699 if (getpid() == 1) signal(SIGTERM, term_handler);
1701 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1702 in the daemon code. For the rest of Exim's uses, we ignore it. */
1704 signal(SIGHUP, SIG_IGN);
1706 /* We don't want to die on pipe errors as the code is written to handle
1707 the write error instead. */
1709 signal(SIGPIPE, SIG_IGN);
1711 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1712 set to SIG_IGN. This causes subprocesses that complete before the parent
1713 process waits for them not to hang around, so when Exim calls wait(), nothing
1714 is there. The wait() code has been made robust against this, but let's ensure
1715 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1716 ending status. We use sigaction rather than plain signal() on those OS where
1717 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1718 problem on AIX with this.) */
1722 struct sigaction act;
1723 act.sa_handler = SIG_DFL;
1724 sigemptyset(&(act.sa_mask));
1726 sigaction(SIGCHLD, &act, NULL);
1729 signal(SIGCHLD, SIG_DFL);
1732 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1737 /* Set up the version number. Set up the leading 'E' for the external form of
1738 message ids, set the pointer to the internal form, and initialize it to
1739 indicate no message being processed. */
1742 message_id_option[0] = '-';
1743 message_id_external = message_id_option + 1;
1744 message_id_external[0] = 'E';
1745 message_id = message_id_external + 1;
1748 /* Set the umask to zero so that any files Exim creates using open() are
1749 created with the modes that it specifies. NOTE: Files created with fopen() have
1750 a problem, which was not recognized till rather late (February 2006). With this
1751 umask, such files will be world writeable. (They are all content scanning files
1752 in the spool directory, which isn't world-accessible, so this is not a
1753 disaster, but it's untidy.) I don't want to change this overall setting,
1754 however, because it will interact badly with the open() calls. Instead, there's
1755 now a function called modefopen() that fiddles with the umask while calling
1760 /* Precompile the regular expression for matching a message id. Keep this in
1761 step with the code that generates ids in the accept.c module. We need to do
1762 this here, because the -M options check their arguments for syntactic validity
1763 using mac_ismsgid, which uses this. */
1766 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1768 /* Precompile the regular expression that is used for matching an SMTP error
1769 code, possibly extended, at the start of an error message. Note that the
1770 terminating whitespace character is included. */
1773 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1776 #ifdef WHITELIST_D_MACROS
1777 /* Precompile the regular expression used to filter the content of macros
1778 given to -D for permissibility. */
1780 regex_whitelisted_macro =
1781 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1784 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1786 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1787 this seems to be a generally accepted convention, since one finds symbolic
1788 links called "mailq" in standard OS configurations. */
1790 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1791 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1794 receiving_message = FALSE;
1795 called_as = US"-mailq";
1798 /* If the program is called as "rmail" treat it as equivalent to
1799 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1800 i.e. preventing a single dot on a line from terminating the message, and
1801 returning with zero return code, even in cases of error (provided an error
1802 message has been sent). */
1804 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1805 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1808 called_as = US"-rmail";
1809 errors_sender_rc = EXIT_SUCCESS;
1812 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1813 this is a smail convention. */
1815 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1816 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1818 smtp_input = smtp_batched_input = TRUE;
1819 called_as = US"-rsmtp";
1822 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1823 this is a smail convention. */
1825 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1826 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1829 receiving_message = FALSE;
1830 called_as = US"-runq";
1833 /* If the program is called as "newaliases" treat it as equivalent to
1834 "exim -bi"; this is a sendmail convention. */
1836 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1837 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1840 receiving_message = FALSE;
1841 called_as = US"-newaliases";
1844 /* Save the original effective uid for a couple of uses later. It should
1845 normally be root, but in some esoteric environments it may not be. */
1847 original_euid = geteuid();
1848 original_egid = getegid();
1850 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1851 to be the same as the real ones. This makes a difference only if Exim is setuid
1852 (or setgid) to something other than root, which could be the case in some
1853 special configurations. */
1855 real_uid = getuid();
1856 real_gid = getgid();
1858 if (real_uid == root_uid)
1860 if ((rv = setgid(real_gid)))
1861 exim_fail("exim: setgid(%ld) failed: %s\n",
1862 (long int)real_gid, strerror(errno));
1863 if ((rv = setuid(real_uid)))
1864 exim_fail("exim: setuid(%ld) failed: %s\n",
1865 (long int)real_uid, strerror(errno));
1868 /* If neither the original real uid nor the original euid was root, Exim is
1869 running in an unprivileged state. */
1871 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1873 /* Scan the program's arguments. Some can be dealt with right away; others are
1874 simply recorded for checking and handling afterwards. Do a high-level switch
1875 on the second character (the one after '-'), to save some effort. */
1877 for (i = 1; i < argc; i++)
1879 BOOL badarg = FALSE;
1880 uschar *arg = argv[i];
1884 /* An argument not starting with '-' is the start of a recipients list;
1885 break out of the options-scanning loop. */
1893 /* An option consisting of -- terminates the options */
1895 if (Ustrcmp(arg, "--") == 0)
1897 recipients_arg = i + 1;
1901 /* Handle flagged options */
1903 switchchar = arg[1];
1906 /* Make all -ex options synonymous with -oex arguments, since that
1907 is assumed by various callers. Also make -qR options synonymous with -R
1908 options, as that seems to be required as well. Allow for -qqR too, and
1909 the same for -S options. */
1911 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1912 Ustrncmp(arg+1, "qR", 2) == 0 ||
1913 Ustrncmp(arg+1, "qS", 2) == 0)
1915 switchchar = arg[2];
1918 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1920 switchchar = arg[3];
1922 f.queue_2stage = TRUE;
1925 /* Make -r synonymous with -f, since it is a documented alias */
1927 else if (arg[1] == 'r') switchchar = 'f';
1929 /* Make -ov synonymous with -v */
1931 else if (Ustrcmp(arg, "-ov") == 0)
1937 /* deal with --option_aliases */
1938 else if (switchchar == '-')
1940 if (Ustrcmp(argrest, "help") == 0)
1942 usage_wanted = TRUE;
1945 else if (Ustrcmp(argrest, "version") == 0)
1952 /* High-level switch on active initial letter */
1957 /* sendmail uses -Ac and -Am to control which .cf file is used;
1960 if (*argrest == '\0') { badarg = TRUE; break; }
1963 BOOL ignore = FALSE;
1968 if (*(argrest + 1) == '\0')
1972 if (!ignore) { badarg = TRUE; break; }
1976 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1977 so has no need of it. */
1980 if (*argrest == 0) i++; /* Skip over the type */
1985 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1987 /* -bd: Run in daemon mode, awaiting SMTP connections.
1988 -bdf: Ditto, but in the foreground.
1991 if (*argrest == 'd')
1993 f.daemon_listen = TRUE;
1994 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1995 else if (*argrest != 0) { badarg = TRUE; break; }
1998 /* -be: Run in expansion test mode
1999 -bem: Ditto, but read a message from a file first
2002 else if (*argrest == 'e')
2004 expansion_test = checking = TRUE;
2005 if (argrest[1] == 'm')
2007 if (++i >= argc) { badarg = TRUE; break; }
2008 expansion_test_message = argv[i];
2011 if (argrest[1] != 0) { badarg = TRUE; break; }
2014 /* -bF: Run system filter test */
2016 else if (*argrest == 'F')
2018 filter_test |= checking = FTEST_SYSTEM;
2019 if (*(++argrest) != 0) { badarg = TRUE; break; }
2020 if (++i < argc) filter_test_sfile = argv[i]; else
2021 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2024 /* -bf: Run user filter test
2025 -bfd: Set domain for filter testing
2026 -bfl: Set local part for filter testing
2027 -bfp: Set prefix for filter testing
2028 -bfs: Set suffix for filter testing
2031 else if (*argrest == 'f')
2033 if (*(++argrest) == 0)
2035 filter_test |= checking = FTEST_USER;
2036 if (++i < argc) filter_test_ufile = argv[i]; else
2037 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2042 exim_fail("exim: string expected after %s\n", arg);
2043 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2044 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2045 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2046 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2047 else { badarg = TRUE; break; }
2051 /* -bh: Host checking - an IP address must follow. */
2053 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2055 if (++i >= argc) { badarg = TRUE; break; }
2056 sender_host_address = argv[i];
2057 host_checking = checking = f.log_testing_mode = TRUE;
2058 f.host_checking_callout = argrest[1] == 'c';
2059 message_logs = FALSE;
2062 /* -bi: This option is used by sendmail to initialize *the* alias file,
2063 though it has the -oA option to specify a different file. Exim has no
2064 concept of *the* alias file, but since Sun's YP make script calls
2065 sendmail this way, some support must be provided. */
2067 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2069 /* -bI: provide information, of the type to follow after a colon.
2070 This is an Exim flag. */
2072 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2074 uschar *p = &argrest[2];
2075 info_flag = CMDINFO_HELP;
2078 if (strcmpic(p, CUS"sieve") == 0)
2080 info_flag = CMDINFO_SIEVE;
2083 else if (strcmpic(p, CUS"dscp") == 0)
2085 info_flag = CMDINFO_DSCP;
2088 else if (strcmpic(p, CUS"help") == 0)
2095 /* -bm: Accept and deliver message - the default option. Reinstate
2096 receiving_message, which got turned off for all -b options. */
2098 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2100 /* -bmalware: test the filename given for malware */
2102 else if (Ustrcmp(argrest, "malware") == 0)
2104 if (++i >= argc) { badarg = TRUE; break; }
2106 malware_test_file = argv[i];
2109 /* -bnq: For locally originating messages, do not qualify unqualified
2110 addresses. In the envelope, this causes errors; in header lines they
2113 else if (Ustrcmp(argrest, "nq") == 0)
2115 f.allow_unqualified_sender = FALSE;
2116 f.allow_unqualified_recipient = FALSE;
2119 /* -bpxx: List the contents of the mail queue, in various forms. If
2120 the option is -bpc, just a queue count is needed. Otherwise, if the
2121 first letter after p is r, then order is random. */
2123 else if (*argrest == 'p')
2125 if (*(++argrest) == 'c')
2128 if (*(++argrest) != 0) badarg = TRUE;
2132 if (*argrest == 'r')
2134 list_queue_option = 8;
2137 else list_queue_option = 0;
2141 /* -bp: List the contents of the mail queue, top-level only */
2143 if (*argrest == 0) {}
2145 /* -bpu: List the contents of the mail queue, top-level undelivered */
2147 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2149 /* -bpa: List the contents of the mail queue, including all delivered */
2151 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2153 /* Unknown after -bp[r] */
2163 /* -bP: List the configuration variables given as the address list.
2164 Force -v, so configuration errors get displayed. */
2166 else if (Ustrcmp(argrest, "P") == 0)
2168 /* -bP config: we need to setup here, because later,
2169 * when list_options is checked, the config is read already */
2170 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2173 readconf_save_config(version_string);
2177 list_options = TRUE;
2178 debug_selector |= D_v;
2179 debug_file = stderr;
2183 /* -brt: Test retry configuration lookup */
2185 else if (Ustrcmp(argrest, "rt") == 0)
2188 test_retry_arg = i + 1;
2192 /* -brw: Test rewrite configuration */
2194 else if (Ustrcmp(argrest, "rw") == 0)
2197 test_rewrite_arg = i + 1;
2201 /* -bS: Read SMTP commands on standard input, but produce no replies -
2202 all errors are reported by sending messages. */
2204 else if (Ustrcmp(argrest, "S") == 0)
2205 smtp_input = smtp_batched_input = receiving_message = TRUE;
2207 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2208 on standard output. */
2210 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2212 /* -bt: address testing mode */
2214 else if (Ustrcmp(argrest, "t") == 0)
2215 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2217 /* -bv: verify addresses */
2219 else if (Ustrcmp(argrest, "v") == 0)
2220 verify_address_mode = checking = f.log_testing_mode = TRUE;
2222 /* -bvs: verify sender addresses */
2224 else if (Ustrcmp(argrest, "vs") == 0)
2226 verify_address_mode = checking = f.log_testing_mode = TRUE;
2227 verify_as_sender = TRUE;
2230 /* -bV: Print version string and support details */
2232 else if (Ustrcmp(argrest, "V") == 0)
2234 printf("Exim version %s #%s built %s\n", version_string,
2235 version_cnumber, version_date);
2236 printf("%s\n", CS version_copyright);
2237 version_printed = TRUE;
2238 show_whats_supported(stdout);
2239 f.log_testing_mode = TRUE;
2242 /* -bw: inetd wait mode, accept a listening socket as stdin */
2244 else if (*argrest == 'w')
2246 f.inetd_wait_mode = TRUE;
2247 f.background_daemon = FALSE;
2248 f.daemon_listen = TRUE;
2249 if (*(++argrest) != '\0')
2250 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2251 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2258 /* -C: change configuration file list; ignore if it isn't really
2259 a change! Enforce a prefix check if required. */
2264 if(++i < argc) argrest = argv[i]; else
2265 { badarg = TRUE; break; }
2267 if (Ustrcmp(config_main_filelist, argrest) != 0)
2269 #ifdef ALT_CONFIG_PREFIX
2271 int len = Ustrlen(ALT_CONFIG_PREFIX);
2272 const uschar *list = argrest;
2274 while((filename = string_nextinlist(&list, &sep, big_buffer,
2275 big_buffer_size)) != NULL)
2277 if ((Ustrlen(filename) < len ||
2278 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2279 Ustrstr(filename, "/../") != NULL) &&
2280 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2281 exim_fail("-C Permission denied\n");
2284 if (real_uid != root_uid)
2286 #ifdef TRUSTED_CONFIG_LIST
2288 if (real_uid != exim_uid
2289 #ifdef CONFIGURE_OWNER
2290 && real_uid != config_uid
2293 f.trusted_config = FALSE;
2296 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2299 struct stat statbuf;
2301 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2302 (statbuf.st_uid != root_uid /* owner not root */
2303 #ifdef CONFIGURE_OWNER
2304 && statbuf.st_uid != config_uid /* owner not the special one */
2307 (statbuf.st_gid != root_gid /* group not root */
2308 #ifdef CONFIGURE_GROUP
2309 && statbuf.st_gid != config_gid /* group not the special one */
2311 && (statbuf.st_mode & 020) != 0 /* group writeable */
2313 (statbuf.st_mode & 2) != 0) /* world writeable */
2315 f.trusted_config = FALSE;
2320 /* Well, the trust list at least is up to scratch... */
2321 void *reset_point = store_get(0);
2322 uschar *trusted_configs[32];
2326 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2328 uschar *start = big_buffer, *nl;
2329 while (*start && isspace(*start))
2333 nl = Ustrchr(start, '\n');
2336 trusted_configs[nr_configs++] = string_copy(start);
2337 if (nr_configs == 32)
2345 const uschar *list = argrest;
2347 while (f.trusted_config && (filename = string_nextinlist(&list,
2348 &sep, big_buffer, big_buffer_size)) != NULL)
2350 for (i=0; i < nr_configs; i++)
2352 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2355 if (i == nr_configs)
2357 f.trusted_config = FALSE;
2361 store_reset(reset_point);
2365 /* No valid prefixes found in trust_list file. */
2366 f.trusted_config = FALSE;
2372 /* Could not open trust_list file. */
2373 f.trusted_config = FALSE;
2377 /* Not root; don't trust config */
2378 f.trusted_config = FALSE;
2382 config_main_filelist = argrest;
2383 f.config_changed = TRUE;
2388 /* -D: set up a macro definition */
2391 #ifdef DISABLE_D_OPTION
2392 exim_fail("exim: -D is not available in this Exim binary\n");
2398 uschar *s = argrest;
2401 while (isspace(*s)) s++;
2403 if (*s < 'A' || *s > 'Z')
2404 exim_fail("exim: macro name set by -D must start with "
2405 "an upper case letter\n");
2407 while (isalnum(*s) || *s == '_')
2409 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2413 if (ptr == 0) { badarg = TRUE; break; }
2414 while (isspace(*s)) s++;
2417 if (*s++ != '=') { badarg = TRUE; break; }
2418 while (isspace(*s)) s++;
2421 for (m = macros_user; m; m = m->next)
2422 if (Ustrcmp(m->name, name) == 0)
2423 exim_fail("exim: duplicated -D in command line\n");
2425 m = macro_create(name, s, TRUE);
2427 if (clmacro_count >= MAX_CLMACROS)
2428 exim_fail("exim: too many -D options on command line\n");
2429 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2435 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2436 The latter is now a no-op, retained for compatibility only. If -dd is used,
2437 debugging subprocesses of the daemon is disabled. */
2440 if (Ustrcmp(argrest, "ropcr") == 0)
2442 /* drop_cr = TRUE; */
2445 /* Use an intermediate variable so that we don't set debugging while
2446 decoding the debugging bits. */
2450 unsigned int selector = D_default;
2453 if (*argrest == 'd')
2455 f.debug_daemon = TRUE;
2459 decode_bits(&selector, 1, debug_notall, argrest,
2460 debug_options, debug_options_count, US"debug", 0);
2461 debug_selector = selector;
2466 /* -E: This is a local error message. This option is not intended for
2467 external use at all, but is not restricted to trusted callers because it
2468 does no harm (just suppresses certain error messages) and if Exim is run
2469 not setuid root it won't always be trusted when it generates error
2470 messages using this option. If there is a message id following -E, point
2471 message_reference at it, for logging. */
2474 f.local_error_message = TRUE;
2475 if (mac_ismsgid(argrest)) message_reference = argrest;
2479 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2480 option, so it looks as if historically the -oex options are also callable
2481 without the leading -o. So we have to accept them. Before the switch,
2482 anything starting -oe has been converted to -e. Exim does not support all
2483 of the sendmail error options. */
2486 if (Ustrcmp(argrest, "e") == 0)
2488 arg_error_handling = ERRORS_SENDER;
2489 errors_sender_rc = EXIT_SUCCESS;
2491 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2492 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2493 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2494 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2499 /* -F: Set sender's full name, used instead of the gecos entry from
2500 the password file. Since users can usually alter their gecos entries,
2501 there's no security involved in using this instead. The data can follow
2502 the -F or be in the next argument. */
2507 if(++i < argc) argrest = argv[i]; else
2508 { badarg = TRUE; break; }
2510 originator_name = argrest;
2511 f.sender_name_forced = TRUE;
2515 /* -f: Set sender's address - this value is only actually used if Exim is
2516 run by a trusted user, or if untrusted_set_sender is set and matches the
2517 address, except that the null address can always be set by any user. The
2518 test for this happens later, when the value given here is ignored when not
2519 permitted. For an untrusted user, the actual sender is still put in Sender:
2520 if it doesn't match the From: header (unless no_local_from_check is set).
2521 The data can follow the -f or be in the next argument. The -r switch is an
2522 obsolete form of -f but since there appear to be programs out there that
2523 use anything that sendmail has ever supported, better accept it - the
2524 synonymizing is done before the switch above.
2526 At this stage, we must allow domain literal addresses, because we don't
2527 know what the setting of allow_domain_literals is yet. Ditto for trailing
2528 dots and strip_trailing_dot. */
2532 int dummy_start, dummy_end;
2536 if (i+1 < argc) argrest = argv[++i]; else
2537 { badarg = TRUE; break; }
2540 sender_address = string_sprintf(""); /* Ensure writeable memory */
2543 uschar *temp = argrest + Ustrlen(argrest) - 1;
2544 while (temp >= argrest && isspace(*temp)) temp--;
2545 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2546 allow_domain_literals = TRUE;
2547 strip_trailing_dot = TRUE;
2549 allow_utf8_domains = TRUE;
2551 sender_address = parse_extract_address(argrest, &errmess,
2552 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2554 message_smtputf8 = string_is_utf8(sender_address);
2555 allow_utf8_domains = FALSE;
2557 allow_domain_literals = FALSE;
2558 strip_trailing_dot = FALSE;
2559 if (!sender_address)
2560 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2562 f.sender_address_forced = TRUE;
2566 /* -G: sendmail invocation to specify that it's a gateway submission and
2567 sendmail may complain about problems instead of fixing them.
2568 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2569 not at this time complain about problems. */
2575 /* -h: Set the hop count for an incoming message. Exim does not currently
2576 support this; it always computes it by counting the Received: headers.
2577 To put it in will require a change to the spool header file format. */
2582 if(++i < argc) argrest = argv[i]; else
2583 { badarg = TRUE; break; }
2585 if (!isdigit(*argrest)) badarg = TRUE;
2589 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2590 not to be documented for sendmail but mailx (at least) uses it) */
2593 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2597 /* -L: set the identifier used for syslog; equivalent to setting
2598 syslog_processname in the config file, but needs to be an admin option. */
2601 if (*argrest == '\0')
2603 if(++i < argc) argrest = argv[i]; else
2604 { badarg = TRUE; break; }
2606 if ((sz = Ustrlen(argrest)) > 32)
2607 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2609 exim_fail("exim: the -L syslog name is too short\n");
2610 cmdline_syslog_name = argrest;
2614 receiving_message = FALSE;
2616 /* -MC: continue delivery of another message via an existing open
2617 file descriptor. This option is used for an internal call by the
2618 smtp transport when there is a pending message waiting to go to an
2619 address to which it has got a connection. Five subsequent arguments are
2620 required: transport name, host name, IP address, sequence number, and
2621 message_id. Transports may decline to create new processes if the sequence
2622 number gets too big. The channel is stdin. This (-MC) must be the last
2623 argument. There's a subsequent check that the real-uid is privileged.
2625 If we are running in the test harness. delay for a bit, to let the process
2626 that set this one up complete. This makes for repeatability of the logging,
2629 if (Ustrcmp(argrest, "C") == 0)
2631 union sockaddr_46 interface_sock;
2632 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2635 exim_fail("exim: too many or too few arguments after -MC\n");
2637 if (msg_action_arg >= 0)
2638 exim_fail("exim: incompatible arguments\n");
2640 continue_transport = argv[++i];
2641 continue_hostname = argv[++i];
2642 continue_host_address = argv[++i];
2643 continue_sequence = Uatoi(argv[++i]);
2644 msg_action = MSG_DELIVER;
2645 msg_action_arg = ++i;
2646 forced_delivery = TRUE;
2647 queue_run_pid = passed_qr_pid;
2648 queue_run_pipe = passed_qr_pipe;
2650 if (!mac_ismsgid(argv[i]))
2651 exim_fail("exim: malformed message id %s after -MC option\n",
2654 /* Set up $sending_ip_address and $sending_port, unless proxied */
2656 if (!continue_proxy_cipher)
2657 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2659 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2662 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2665 if (f.running_in_test_harness) millisleep(500);
2669 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2673 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2674 precedes -MC (see above). The flag indicates that the host to which
2675 Exim is connected has accepted an AUTH sequence. */
2677 case 'A': f.smtp_authenticated = TRUE; break;
2679 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2680 that exim is connected to supports the esmtp extension DSN */
2682 case 'D': smtp_peer_options |= OPTION_DSN; break;
2684 /* -MCG: set the queue name, to a non-default value */
2686 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2690 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2692 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2694 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2695 it preceded -MC (see above) */
2697 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2699 /* -MCQ: pass on the pid of the queue-running process that started
2700 this chain of deliveries and the fd of its synchronizing pipe; this
2701 is useful only when it precedes -MC (see above) */
2703 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2705 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2709 /* -MCS: set the smtp_use_size flag; this is useful only when it
2710 precedes -MC (see above) */
2712 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2715 /* -MCt: similar to -MCT below but the connection is still open
2716 via a proxy process which handles the TLS context and coding.
2717 Require three arguments for the proxied local address and port,
2718 and the TLS cipher. */
2720 case 't': if (++i < argc) sending_ip_address = argv[i];
2722 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2724 if (++i < argc) continue_proxy_cipher = argv[i];
2728 /* -MCT: set the tls_offered flag; this is useful only when it
2729 precedes -MC (see above). The flag indicates that the host to which
2730 Exim is connected has offered TLS support. */
2732 case 'T': smtp_peer_options |= OPTION_TLS; break;
2735 default: badarg = TRUE; break;
2740 /* -M[x]: various operations on the following list of message ids:
2741 -M deliver the messages, ignoring next retry times and thawing
2742 -Mc deliver the messages, checking next retry times, no thawing
2743 -Mf freeze the messages
2744 -Mg give up on the messages
2745 -Mt thaw the messages
2746 -Mrm remove the messages
2747 In the above cases, this must be the last option. There are also the
2748 following options which are followed by a single message id, and which
2749 act on that message. Some of them use the "recipient" addresses as well.
2750 -Mar add recipient(s)
2751 -Mmad mark all recipients delivered
2752 -Mmd mark recipients(s) delivered
2754 -Mset load a message for use with -be
2756 -Mvc show copy (of whole message, in RFC 2822 format)
2761 else if (*argrest == 0)
2763 msg_action = MSG_DELIVER;
2764 forced_delivery = f.deliver_force_thaw = TRUE;
2766 else if (Ustrcmp(argrest, "ar") == 0)
2768 msg_action = MSG_ADD_RECIPIENT;
2769 one_msg_action = TRUE;
2771 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2772 else if (Ustrcmp(argrest, "es") == 0)
2774 msg_action = MSG_EDIT_SENDER;
2775 one_msg_action = TRUE;
2777 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2778 else if (Ustrcmp(argrest, "g") == 0)
2780 msg_action = MSG_DELIVER;
2781 deliver_give_up = TRUE;
2783 else if (Ustrcmp(argrest, "mad") == 0)
2785 msg_action = MSG_MARK_ALL_DELIVERED;
2787 else if (Ustrcmp(argrest, "md") == 0)
2789 msg_action = MSG_MARK_DELIVERED;
2790 one_msg_action = TRUE;
2792 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2793 else if (Ustrcmp(argrest, "set") == 0)
2795 msg_action = MSG_LOAD;
2796 one_msg_action = TRUE;
2798 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2799 else if (Ustrcmp(argrest, "vb") == 0)
2801 msg_action = MSG_SHOW_BODY;
2802 one_msg_action = TRUE;
2804 else if (Ustrcmp(argrest, "vc") == 0)
2806 msg_action = MSG_SHOW_COPY;
2807 one_msg_action = TRUE;
2809 else if (Ustrcmp(argrest, "vh") == 0)
2811 msg_action = MSG_SHOW_HEADER;
2812 one_msg_action = TRUE;
2814 else if (Ustrcmp(argrest, "vl") == 0)
2816 msg_action = MSG_SHOW_LOG;
2817 one_msg_action = TRUE;
2819 else { badarg = TRUE; break; }
2821 /* All the -Mxx options require at least one message id. */
2823 msg_action_arg = i + 1;
2824 if (msg_action_arg >= argc)
2825 exim_fail("exim: no message ids given after %s option\n", arg);
2827 /* Some require only message ids to follow */
2829 if (!one_msg_action)
2831 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2832 exim_fail("exim: malformed message id %s after %s option\n",
2834 goto END_ARG; /* Remaining args are ids */
2837 /* Others require only one message id, possibly followed by addresses,
2838 which will be handled as normal arguments. */
2842 if (!mac_ismsgid(argv[msg_action_arg]))
2843 exim_fail("exim: malformed message id %s after %s option\n",
2844 argv[msg_action_arg], arg);
2850 /* Some programs seem to call the -om option without the leading o;
2851 for sendmail it askes for "me too". Exim always does this. */
2854 if (*argrest != 0) badarg = TRUE;
2858 /* -N: don't do delivery - a debugging option that stops transports doing
2859 their thing. It implies debugging at the D_v level. */
2864 f.dont_deliver = TRUE;
2865 debug_selector |= D_v;
2866 debug_file = stderr;
2872 /* -n: This means "don't alias" in sendmail, apparently.
2873 For normal invocations, it has no effect.
2874 It may affect some other options. */
2880 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2881 option to the specified value. This form uses long names. We need to handle
2882 -O option=value and -Ooption=value. */
2888 exim_fail("exim: string expected after -O\n");
2894 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2897 if (*argrest == 'A')
2899 alias_arg = argrest + 1;
2900 if (alias_arg[0] == 0)
2902 if (i+1 < argc) alias_arg = argv[++i]; else
2903 exim_fail("exim: string expected after -oA\n");
2907 /* -oB: Set a connection message max value for remote deliveries */
2909 else if (*argrest == 'B')
2911 uschar *p = argrest + 1;
2914 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2916 connection_max_messages = 1;
2924 exim_fail("exim: number expected after -oB\n");
2925 connection_max_messages = Uatoi(p);
2929 /* -odb: background delivery */
2931 else if (Ustrcmp(argrest, "db") == 0)
2933 f.synchronous_delivery = FALSE;
2934 arg_queue_only = FALSE;
2935 queue_only_set = TRUE;
2938 /* -odf: foreground delivery (smail-compatible option); same effect as
2939 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2942 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2944 f.synchronous_delivery = TRUE;
2945 arg_queue_only = FALSE;
2946 queue_only_set = TRUE;
2949 /* -odq: queue only */
2951 else if (Ustrcmp(argrest, "dq") == 0)
2953 f.synchronous_delivery = FALSE;
2954 arg_queue_only = TRUE;
2955 queue_only_set = TRUE;
2958 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2959 but no remote delivery */
2961 else if (Ustrcmp(argrest, "dqs") == 0)
2963 f.queue_smtp = TRUE;
2964 arg_queue_only = FALSE;
2965 queue_only_set = TRUE;
2968 /* -oex: Sendmail error flags. As these are also accepted without the
2969 leading -o prefix, for compatibility with vacation and other callers,
2970 they are handled with -e above. */
2972 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2973 -oitrue: Another sendmail syntax for the same */
2975 else if (Ustrcmp(argrest, "i") == 0 ||
2976 Ustrcmp(argrest, "itrue") == 0)
2979 /* -oM*: Set various characteristics for an incoming message; actually
2980 acted on for trusted callers only. */
2982 else if (*argrest == 'M')
2985 exim_fail("exim: data expected after -o%s\n", argrest);
2987 /* -oMa: Set sender host address */
2989 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2991 /* -oMaa: Set authenticator name */
2993 else if (Ustrcmp(argrest, "Maa") == 0)
2994 sender_host_authenticated = argv[++i];
2996 /* -oMas: setting authenticated sender */
2998 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3000 /* -oMai: setting authenticated id */
3002 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3004 /* -oMi: Set incoming interface address */
3006 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3008 /* -oMm: Message reference */
3010 else if (Ustrcmp(argrest, "Mm") == 0)
3012 if (!mac_ismsgid(argv[i+1]))
3013 exim_fail("-oMm must be a valid message ID\n");
3014 if (!f.trusted_config)
3015 exim_fail("-oMm must be called by a trusted user/config\n");
3016 message_reference = argv[++i];
3019 /* -oMr: Received protocol */
3021 else if (Ustrcmp(argrest, "Mr") == 0)
3023 if (received_protocol)
3024 exim_fail("received_protocol is set already\n");
3026 received_protocol = argv[++i];
3028 /* -oMs: Set sender host name */
3030 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3032 /* -oMt: Set sender ident */
3034 else if (Ustrcmp(argrest, "Mt") == 0)
3036 sender_ident_set = TRUE;
3037 sender_ident = argv[++i];
3040 /* Else a bad argument */
3049 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3050 seem to call this as -m (undocumented), so that is also accepted (see
3053 else if (Ustrcmp(argrest, "m") == 0) {}
3055 /* -oo: An ancient flag for old-style addresses which still seems to
3056 crop up in some calls (see in SCO). */
3058 else if (Ustrcmp(argrest, "o") == 0) {}
3060 /* -oP <name>: set pid file path for daemon */
3062 else if (Ustrcmp(argrest, "P") == 0)
3063 override_pid_file_path = argv[++i];
3065 /* -or <n>: set timeout for non-SMTP acceptance
3066 -os <n>: set timeout for SMTP acceptance */
3068 else if (*argrest == 'r' || *argrest == 's')
3070 int *tp = (*argrest == 'r')?
3071 &arg_receive_timeout : &arg_smtp_receive_timeout;
3072 if (argrest[1] == 0)
3074 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3076 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3078 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3081 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3083 else if (Ustrcmp(argrest, "X") == 0)
3084 override_local_interfaces = argv[++i];
3086 /* Unknown -o argument */
3092 /* -ps: force Perl startup; -pd force delayed Perl startup */
3096 if (*argrest == 's' && argrest[1] == 0)
3098 perl_start_option = 1;
3101 if (*argrest == 'd' && argrest[1] == 0)
3103 perl_start_option = -1;
3108 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3109 which sets the host protocol and host name */
3113 argrest = argv[++i];
3115 { badarg = TRUE; break; }
3121 if (received_protocol)
3122 exim_fail("received_protocol is set already\n");
3124 hn = Ustrchr(argrest, ':');
3126 received_protocol = argrest;
3129 int old_pool = store_pool;
3130 store_pool = POOL_PERM;
3131 received_protocol = string_copyn(argrest, hn - argrest);
3132 store_pool = old_pool;
3133 sender_host_name = hn + 1;
3140 receiving_message = FALSE;
3141 if (queue_interval >= 0)
3142 exim_fail("exim: -q specified more than once\n");
3144 /* -qq...: Do queue runs in a 2-stage manner */
3146 if (*argrest == 'q')
3148 f.queue_2stage = TRUE;
3152 /* -qi...: Do only first (initial) deliveries */
3154 if (*argrest == 'i')
3156 f.queue_run_first_delivery = TRUE;
3160 /* -qf...: Run the queue, forcing deliveries
3161 -qff..: Ditto, forcing thawing as well */
3163 if (*argrest == 'f')
3165 f.queue_run_force = TRUE;
3166 if (*++argrest == 'f')
3168 f.deliver_force_thaw = TRUE;
3173 /* -q[f][f]l...: Run the queue only on local deliveries */
3175 if (*argrest == 'l')
3177 f.queue_run_local = TRUE;
3181 /* -q[f][f][l][G<name>]... Work on the named queue */
3183 if (*argrest == 'G')
3186 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3187 queue_name = string_copyn(argrest, i);
3189 if (*argrest == '/') argrest++;
3192 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3193 only, optionally named, optionally starting from a given message id. */
3195 if (!(list_queue || count_queue))
3197 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3200 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3201 start_queue_run_id = argv[++i];
3202 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3203 stop_queue_run_id = argv[++i];
3206 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3207 forced, optionally local only, optionally named. */
3209 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3211 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3215 case 'R': /* Synonymous with -qR... */
3216 receiving_message = FALSE;
3218 /* -Rf: As -R (below) but force all deliveries,
3219 -Rff: Ditto, but also thaw all frozen messages,
3220 -Rr: String is regex
3221 -Rrf: Regex and force
3222 -Rrff: Regex and force and thaw
3224 in all cases provided there are no further characters in this
3228 for (int i = 0; i < nelem(rsopts); i++)
3229 if (Ustrcmp(argrest, rsopts[i]) == 0)
3231 if (i != 2) f.queue_run_force = TRUE;
3232 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3233 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3234 argrest += Ustrlen(rsopts[i]);
3237 /* -R: Set string to match in addresses for forced queue run to
3238 pick out particular messages. */
3241 deliver_selectstring = argrest;
3242 else if (i+1 < argc)
3243 deliver_selectstring = argv[++i];
3245 exim_fail("exim: string expected after -R\n");
3249 /* -r: an obsolete synonym for -f (see above) */
3252 /* -S: Like -R but works on sender. */
3254 case 'S': /* Synonymous with -qS... */
3255 receiving_message = FALSE;
3257 /* -Sf: As -S (below) but force all deliveries,
3258 -Sff: Ditto, but also thaw all frozen messages,
3259 -Sr: String is regex
3260 -Srf: Regex and force
3261 -Srff: Regex and force and thaw
3263 in all cases provided there are no further characters in this
3267 for (int i = 0; i < nelem(rsopts); i++)
3268 if (Ustrcmp(argrest, rsopts[i]) == 0)
3270 if (i != 2) f.queue_run_force = TRUE;
3271 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3272 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3273 argrest += Ustrlen(rsopts[i]);
3276 /* -S: Set string to match in addresses for forced queue run to
3277 pick out particular messages. */
3280 deliver_selectstring_sender = argrest;
3281 else if (i+1 < argc)
3282 deliver_selectstring_sender = argv[++i];
3284 exim_fail("exim: string expected after -S\n");
3287 /* -Tqt is an option that is exclusively for use by the testing suite.
3288 It is not recognized in other circumstances. It allows for the setting up
3289 of explicit "queue times" so that various warning/retry things can be
3290 tested. Otherwise variability of clock ticks etc. cause problems. */
3293 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3294 fudged_queue_times = argv[++i];
3299 /* -t: Set flag to extract recipients from body of message. */
3302 if (*argrest == 0) extract_recipients = TRUE;
3304 /* -ti: Set flag to extract recipients from body of message, and also
3305 specify that dot does not end the message. */
3307 else if (Ustrcmp(argrest, "i") == 0)
3309 extract_recipients = TRUE;
3313 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3316 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3323 /* -U: This means "initial user submission" in sendmail, apparently. The
3324 doc claims that in future sendmail may refuse syntactically invalid
3325 messages instead of fixing them. For the moment, we just ignore it. */
3331 /* -v: verify things - this is a very low-level debugging */
3336 debug_selector |= D_v;
3337 debug_file = stderr;
3343 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3345 The -x flag tells the sendmail command that mail from a local
3346 mail program has National Language Support (NLS) extended characters
3347 in the body of the mail item. The sendmail command can send mail with
3348 extended NLS characters across networks that normally corrupts these
3351 As Exim is 8-bit clean, it just ignores this flag. */
3354 if (*argrest != 0) badarg = TRUE;
3357 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3358 logs to that file. We swallow the parameter and otherwise ignore it. */
3361 if (*argrest == '\0')
3363 exim_fail("exim: string expected after -X\n");
3367 if (*argrest == '\0')
3369 log_oneline = argv[i];
3371 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3374 /* All other initial characters are errors */
3379 } /* End of high-level switch statement */
3381 /* Failed to recognize the option, or syntax error */
3384 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3385 "option %s\n", arg);
3389 /* If -R or -S have been specified without -q, assume a single queue run. */
3391 if ( (deliver_selectstring || deliver_selectstring_sender)
3392 && queue_interval < 0)
3397 /* If usage_wanted is set we call the usage function - which never returns */
3398 if (usage_wanted) exim_usage(called_as);
3400 /* Arguments have been processed. Check for incompatibilities. */
3402 (smtp_input || extract_recipients || recipients_arg < argc) &&
3403 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3404 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3405 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3408 msg_action_arg > 0 &&
3409 (f.daemon_listen || queue_interval > 0 || list_options ||
3410 (checking && msg_action != MSG_LOAD) ||
3411 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3414 (f.daemon_listen || queue_interval > 0) &&
3415 (sender_address != NULL || list_options || list_queue || checking ||
3419 f.daemon_listen && queue_interval == 0
3422 f.inetd_wait_mode && queue_interval >= 0
3426 (checking || smtp_input || extract_recipients ||
3427 filter_test != FTEST_NONE || bi_option)
3430 verify_address_mode &&
3431 (f.address_test_mode || smtp_input || extract_recipients ||
3432 filter_test != FTEST_NONE || bi_option)
3435 f.address_test_mode && (smtp_input || extract_recipients ||
3436 filter_test != FTEST_NONE || bi_option)
3439 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3443 deliver_selectstring != NULL && queue_interval < 0
3446 msg_action == MSG_LOAD &&
3447 (!expansion_test || expansion_test_message != NULL)
3450 exim_fail("exim: incompatible command-line options or arguments\n");
3452 /* If debugging is set up, set the file and the file descriptor to pass on to
3453 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3454 to run in the foreground. */
3456 if (debug_selector != 0)
3458 debug_file = stderr;
3459 debug_fd = fileno(debug_file);
3460 f.background_daemon = FALSE;
3461 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3462 if (debug_selector != D_v) /* -v only doesn't show this */
3464 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3465 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3467 if (!version_printed)
3468 show_whats_supported(stderr);
3472 /* When started with root privilege, ensure that the limits on the number of
3473 open files and the number of processes (where that is accessible) are
3474 sufficiently large, or are unset, in case Exim has been called from an
3475 environment where the limits are screwed down. Not all OS have the ability to
3476 change some of these limits. */
3480 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3486 #ifdef RLIMIT_NOFILE
3487 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3489 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3491 rlp.rlim_cur = rlp.rlim_max = 0;
3494 /* I originally chose 1000 as a nice big number that was unlikely to
3495 be exceeded. It turns out that some older OS have a fixed upper limit of
3498 if (rlp.rlim_cur < 1000)
3500 rlp.rlim_cur = rlp.rlim_max = 1000;
3501 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3503 rlp.rlim_cur = rlp.rlim_max = 256;
3504 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3505 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3512 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3514 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3516 rlp.rlim_cur = rlp.rlim_max = 0;
3519 #ifdef RLIM_INFINITY
3520 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3522 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3524 if (rlp.rlim_cur < 1000)
3526 rlp.rlim_cur = rlp.rlim_max = 1000;
3528 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3529 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3535 /* Exim is normally entered as root (but some special configurations are
3536 possible that don't do this). However, it always spins off sub-processes that
3537 set their uid and gid as required for local delivery. We don't want to pass on
3538 any extra groups that root may belong to, so we want to get rid of them all at
3541 We need to obey setgroups() at this stage, before possibly giving up root
3542 privilege for a changed configuration file, but later on we might need to
3543 check on the additional groups for the admin user privilege - can't do that
3544 till after reading the config, which might specify the exim gid. Therefore,
3545 save the group list here first. */
3547 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3548 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3550 /* There is a fundamental difference in some BSD systems in the matter of
3551 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3552 known not to be different. On the "different" systems there is a single group
3553 list, and the first entry in it is the current group. On all other versions of
3554 Unix there is a supplementary group list, which is in *addition* to the current
3555 group. Consequently, to get rid of all extraneous groups on a "standard" system
3556 you pass over 0 groups to setgroups(), while on a "different" system you pass
3557 over a single group - the current group, which is always the first group in the
3558 list. Calling setgroups() with zero groups on a "different" system results in
3559 an error return. The following code should cope with both types of system.
3561 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3562 the "setgroups() with zero groups" - and changes the egid.
3563 Thanks to that we had to stash the original_egid above, for use below
3564 in the call to exim_setugid().
3566 However, if this process isn't running as root, setgroups() can't be used
3567 since you have to be root to run it, even if throwing away groups. Not being
3568 root here happens only in some unusual configurations. We just ignore the
3571 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3572 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3574 /* If the configuration file name has been altered by an argument on the
3575 command line (either a new file name or a macro definition) and the caller is
3576 not root, or if this is a filter testing run, remove any setuid privilege the
3577 program has and run as the underlying user.
3579 The exim user is locked out of this, which severely restricts the use of -C
3582 Otherwise, set the real ids to the effective values (should be root unless run
3583 from inetd, which it can either be root or the exim uid, if one is configured).
3585 There is a private mechanism for bypassing some of this, in order to make it
3586 possible to test lots of configurations automatically, without having either to
3587 recompile each time, or to patch in an actual configuration file name and other
3588 values (such as the path name). If running in the test harness, pretend that
3589 configuration file changes and macro definitions haven't happened. */
3592 (!f.trusted_config || /* Config changed, or */
3593 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3594 real_uid != root_uid && /* Not root, and */
3595 !f.running_in_test_harness /* Not fudged */
3597 expansion_test /* expansion testing */
3599 filter_test != FTEST_NONE) /* Filter testing */
3601 setgroups(group_count, group_list);
3602 exim_setugid(real_uid, real_gid, FALSE,
3603 US"-C, -D, -be or -bf forces real uid");
3604 removed_privilege = TRUE;
3606 /* In the normal case when Exim is called like this, stderr is available
3607 and should be used for any logging information because attempts to write
3608 to the log will usually fail. To arrange this, we unset really_exim. However,
3609 if no stderr is available there is no point - we might as well have a go
3610 at the log (if it fails, syslog will be written).
3612 Note that if the invoker is Exim, the logs remain available. Messing with
3613 this causes unlogged successful deliveries. */
3615 if (log_stderr && real_uid != exim_uid)
3616 f.really_exim = FALSE;
3619 /* Privilege is to be retained for the moment. It may be dropped later,
3620 depending on the job that this Exim process has been asked to do. For now, set
3621 the real uid to the effective so that subsequent re-execs of Exim are done by a
3625 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3627 /* If testing a filter, open the file(s) now, before wasting time doing other
3628 setups and reading the message. */
3630 if (filter_test & FTEST_SYSTEM)
3631 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3632 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3635 if (filter_test & FTEST_USER)
3636 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3637 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3640 /* Initialise lookup_list
3641 If debugging, already called above via version reporting.
3642 In either case, we initialise the list of available lookups while running
3643 as root. All dynamically modules are loaded from a directory which is
3644 hard-coded into the binary and is code which, if not a module, would be
3645 part of Exim already. Ability to modify the content of the directory
3646 is equivalent to the ability to modify a setuid binary!
3648 This needs to happen before we read the main configuration. */
3652 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3655 /* Read the main runtime configuration data; this gives up if there
3656 is a failure. It leaves the configuration file open so that the subsequent
3657 configuration data for delivery can be read if needed.
3659 NOTE: immediately after opening the configuration file we change the working
3660 directory to "/"! Later we change to $spool_directory. We do it there, because
3661 during readconf_main() some expansion takes place already. */
3663 /* Store the initial cwd before we change directories. Can be NULL if the
3664 dir has already been unlinked. */
3665 initial_cwd = os_getcwd(NULL, 0);
3668 -be[m] expansion test -
3669 -b[fF] filter test new
3671 -bmalware malware_test_file new
3673 -brw rewrite test new
3675 -bv[s] address verify -
3677 -bP <option> (except -bP config, which sets list_config)
3679 If any of these options is set, we suppress warnings about configuration
3680 issues (currently about tls_advertise_hosts and keep_environment not being
3683 readconf_main(checking || list_options);
3686 /* Now in directory "/" */
3688 if (cleanup_environment() == FALSE)
3689 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3692 /* If an action on specific messages is requested, or if a daemon or queue
3693 runner is being started, we need to know if Exim was called by an admin user.
3694 This is the case if the real user is root or exim, or if the real group is
3695 exim, or if one of the supplementary groups is exim or a group listed in
3696 admin_groups. We don't fail all message actions immediately if not admin_user,
3697 since some actions can be performed by non-admin users. Instead, set admin_user
3698 for later interrogation. */
3700 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3701 f.admin_user = TRUE;
3703 for (int i = 0; i < group_count && !f.admin_user; i++)
3704 if (group_list[i] == exim_gid)
3705 f.admin_user = TRUE;
3706 else if (admin_groups)
3707 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3708 if (admin_groups[j] == group_list[i])
3709 f.admin_user = TRUE;
3711 /* Another group of privileged users are the trusted users. These are root,
3712 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3713 are permitted to specify sender_addresses with -f on the command line, and
3714 other message parameters as well. */
3716 if (real_uid == root_uid || real_uid == exim_uid)
3717 f.trusted_caller = TRUE;
3721 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3722 if (trusted_users[i] == real_uid)
3723 f.trusted_caller = TRUE;
3726 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3727 if (trusted_groups[i] == real_gid)
3728 f.trusted_caller = TRUE;
3729 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3730 if (trusted_groups[i] == group_list[j])
3731 f.trusted_caller = TRUE;
3734 /* At this point, we know if the user is privileged and some command-line
3735 options become possibly impermissible, depending upon the configuration file. */
3737 if (checking && commandline_checks_require_admin && !f.admin_user)
3738 exim_fail("exim: those command-line flags are set to require admin\n");
3740 /* Handle the decoding of logging options. */
3742 decode_bits(log_selector, log_selector_size, log_notall,
3743 log_selector_string, log_options, log_options_count, US"log", 0);
3747 debug_printf("configuration file is %s\n", config_main_filename);
3748 debug_printf("log selectors =");
3749 for (int i = 0; i < log_selector_size; i++)
3750 debug_printf(" %08x", log_selector[i]);
3754 /* If domain literals are not allowed, check the sender address that was
3755 supplied with -f. Ditto for a stripped trailing dot. */
3759 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3760 exim_fail("exim: bad -f address \"%s\": domain literals not "
3761 "allowed\n", sender_address);
3762 if (f_end_dot && !strip_trailing_dot)
3763 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3764 "(trailing dot not allowed)\n", sender_address);
3767 /* See if an admin user overrode our logging. */
3769 if (cmdline_syslog_name)
3772 syslog_processname = cmdline_syslog_name;
3773 log_file_path = string_copy(CUS"syslog");
3776 /* not a panic, non-privileged users should not be able to spam paniclog */
3778 "exim: you lack sufficient privilege to specify syslog process name\n");
3780 /* Paranoia check of maximum lengths of certain strings. There is a check
3781 on the length of the log file path in log.c, which will come into effect
3782 if there are any calls to write the log earlier than this. However, if we
3783 get this far but the string is very long, it is better to stop now than to
3784 carry on and (e.g.) receive a message and then have to collapse. The call to
3785 log_write() from here will cause the ultimate panic collapse if the complete
3786 file name exceeds the buffer length. */
3788 if (Ustrlen(log_file_path) > 200)
3789 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3790 "log_file_path is longer than 200 chars: aborting");
3792 if (Ustrlen(pid_file_path) > 200)
3793 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3794 "pid_file_path is longer than 200 chars: aborting");
3796 if (Ustrlen(spool_directory) > 200)
3797 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3798 "spool_directory is longer than 200 chars: aborting");
3800 /* Length check on the process name given to syslog for its TAG field,
3801 which is only permitted to be 32 characters or less. See RFC 3164. */
3803 if (Ustrlen(syslog_processname) > 32)
3804 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3805 "syslog_processname is longer than 32 chars: aborting");
3810 log_write(0, LOG_MAIN, "%s", log_oneline);
3811 return EXIT_SUCCESS;
3814 return EXIT_FAILURE;
3816 /* In some operating systems, the environment variable TMPDIR controls where
3817 temporary files are created; Exim doesn't use these (apart from when delivering
3818 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3819 If TMPDIR is found in the environment, reset it to the value defined in the
3820 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3821 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3822 EXIM_TMPDIR by the build scripts.
3826 if (environ) for (uschar ** p = USS environ; *p; p++)
3827 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3829 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3830 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3832 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3836 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3837 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3838 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3839 called by a user who has set the TZ variable. This then affects the timestamps
3840 in log files and in Received: headers, and any created Date: header lines. The
3841 required timezone is settable in the configuration file, so nothing can be done
3842 about this earlier - but hopefully nothing will normally be logged earlier than
3843 this. We have to make a new environment if TZ is wrong, but don't bother if
3844 timestamps_utc is set, because then all times are in UTC anyway. */
3846 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3847 f.timestamps_utc = TRUE;
3850 uschar *envtz = US getenv("TZ");
3852 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3853 : timezone_string != NULL
3856 uschar **p = USS environ;
3860 if (environ) while (*p++) count++;
3861 if (!envtz) count++;
3862 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3863 if (environ) for (p = USS environ; *p; p++)
3864 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3865 if (timezone_string)
3867 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3868 sprintf(CS *newp++, "TZ=%s", timezone_string);
3873 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3874 tod_stamp(tod_log));
3878 /* Handle the case when we have removed the setuid privilege because of -C or
3879 -D. This means that the caller of Exim was not root.
3881 There is a problem if we were running as the Exim user. The sysadmin may
3882 expect this case to retain privilege because "the binary was called by the
3883 Exim user", but it hasn't, because either the -D option set macros, or the
3884 -C option set a non-trusted configuration file. There are two possibilities:
3886 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3887 to do message deliveries. Thus, the fact that it is running as a
3888 non-privileged user is plausible, and might be wanted in some special
3889 configurations. However, really_exim will have been set false when
3890 privilege was dropped, to stop Exim trying to write to its normal log
3891 files. Therefore, re-enable normal log processing, assuming the sysadmin
3892 has set up the log directory correctly.
3894 (2) If deliver_drop_privilege is not set, the configuration won't work as
3895 apparently intended, and so we log a panic message. In order to retain
3896 root for -C or -D, the caller must either be root or be invoking a
3897 trusted configuration file (when deliver_drop_privilege is false). */
3899 if ( removed_privilege
3900 && (!f.trusted_config || opt_D_used)
3901 && real_uid == exim_uid)
3902 if (deliver_drop_privilege)
3903 f.really_exim = TRUE; /* let logging work normally */
3905 log_write(0, LOG_MAIN|LOG_PANIC,
3906 "exim user lost privilege for using %s option",
3907 f.trusted_config? "-D" : "-C");
3909 /* Start up Perl interpreter if Perl support is configured and there is a
3910 perl_startup option, and the configuration or the command line specifies
3911 initializing starting. Note that the global variables are actually called
3912 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3915 if (perl_start_option != 0)
3916 opt_perl_at_start = (perl_start_option > 0);
3917 if (opt_perl_at_start && opt_perl_startup != NULL)
3920 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3921 if ((errstr = init_perl(opt_perl_startup)))
3922 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3923 opt_perl_started = TRUE;
3925 #endif /* EXIM_PERL */
3927 /* Log the arguments of the call if the configuration file said so. This is
3928 a debugging feature for finding out what arguments certain MUAs actually use.
3929 Don't attempt it if logging is disabled, or if listing variables or if
3930 verifying/testing addresses or expansions. */
3932 if ( (debug_selector & D_any || LOGGING(arguments))
3933 && f.really_exim && !list_options && !checking)
3935 uschar *p = big_buffer;
3936 Ustrcpy(p, "cwd= (failed)");
3942 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3943 p += 4 + Ustrlen(initial_cwd);
3944 /* in case p is near the end and we don't provide enough space for
3945 * string_format to be willing to write. */
3949 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3951 for (int i = 0; i < argc; i++)
3953 int len = Ustrlen(argv[i]);
3954 const uschar *printing;
3956 if (p + len + 8 >= big_buffer + big_buffer_size)
3959 log_write(0, LOG_MAIN, "%s", big_buffer);
3960 Ustrcpy(big_buffer, "...");
3963 printing = string_printing(argv[i]);
3964 if (printing[0] == 0) quote = US"\""; else
3966 const uschar *pp = printing;
3968 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3970 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3971 (p - big_buffer) - 4), printing, quote);
3974 if (LOGGING(arguments))
3975 log_write(0, LOG_MAIN, "%s", big_buffer);
3977 debug_printf("%s\n", big_buffer);
3980 /* Set the working directory to be the top-level spool directory. We don't rely
3981 on this in the code, which always uses fully qualified names, but it's useful
3982 for core dumps etc. Don't complain if it fails - the spool directory might not
3983 be generally accessible and calls with the -C option (and others) have lost
3984 privilege by now. Before the chdir, we try to ensure that the directory exists.
3987 if (Uchdir(spool_directory) != 0)
3990 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3991 dummy = /* quieten compiler */ Uchdir(spool_directory);
3992 dummy = dummy; /* yet more compiler quietening, sigh */
3995 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3996 alias file. Exim doesn't have such a concept, but this call is screwed into
3997 Sun's YP makefiles. Handle this by calling a configured script, as the real
3998 user who called Exim. The -oA option can be used to pass an argument to the
4003 (void)fclose(config_file);
4004 if (bi_command != NULL)
4008 argv[i++] = bi_command;
4009 if (alias_arg != NULL) argv[i++] = alias_arg;
4012 setgroups(group_count, group_list);
4013 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4015 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4016 (argv[1] == NULL)? US"" : argv[1]);
4018 execv(CS argv[0], (char *const *)argv);
4019 exim_fail("exim: exec failed: %s\n", strerror(errno));
4023 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4028 /* We moved the admin/trusted check to be immediately after reading the
4029 configuration file. We leave these prints here to ensure that syslog setup,
4030 logfile setup, and so on has already happened. */
4032 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4033 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4035 /* Only an admin user may start the daemon or force a queue run in the default
4036 configuration, but the queue run restriction can be relaxed. Only an admin
4037 user may request that a message be returned to its sender forthwith. Only an
4038 admin user may specify a debug level greater than D_v (because it might show
4039 passwords, etc. in lookup queries). Only an admin user may request a queue
4040 count. Only an admin user can use the test interface to scan for email
4041 (because Exim will be in the spool dir and able to look at mails). */
4045 BOOL debugset = (debug_selector & ~D_v) != 0;
4046 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4047 (count_queue && queue_list_requires_admin) ||
4048 (list_queue && queue_list_requires_admin) ||
4049 (queue_interval >= 0 && prod_requires_admin) ||
4050 (debugset && !f.running_in_test_harness))
4051 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4054 /* If the real user is not root or the exim uid, the argument for passing
4055 in an open TCP/IP connection for another message is not permitted, nor is
4056 running with the -N option for any delivery action, unless this call to exim is
4057 one that supplied an input message, or we are using a patched exim for
4058 regression testing. */
4060 if (real_uid != root_uid && real_uid != exim_uid &&
4061 (continue_hostname != NULL ||
4063 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4064 )) && !f.running_in_test_harness)
4065 exim_fail("exim: Permission denied\n");
4067 /* If the caller is not trusted, certain arguments are ignored when running for
4068 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4069 Note that authority for performing certain actions on messages is tested in the
4070 queue_action() function. */
4072 if (!f.trusted_caller && !checking)
4074 sender_host_name = sender_host_address = interface_address =
4075 sender_ident = received_protocol = NULL;
4076 sender_host_port = interface_port = 0;
4077 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4080 /* If a sender host address is set, extract the optional port number off the
4081 end of it and check its syntax. Do the same thing for the interface address.
4082 Exim exits if the syntax is bad. */
4086 if (sender_host_address != NULL)
4087 sender_host_port = check_port(sender_host_address);
4088 if (interface_address != NULL)
4089 interface_port = check_port(interface_address);
4092 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4095 if (f.trusted_caller)
4097 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4098 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4101 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4104 /* If an SMTP message is being received check to see if the standard input is a
4105 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4106 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4111 union sockaddr_46 inetd_sock;
4112 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4113 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4115 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4116 if (family == AF_INET || family == AF_INET6)
4118 union sockaddr_46 interface_sock;
4119 size = sizeof(interface_sock);
4121 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4122 interface_address = host_ntoa(-1, &interface_sock, NULL,
4125 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4127 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4130 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4131 NULL, &sender_host_port);
4132 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4133 "inetd is not supported when mua_wrapper is set");
4137 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4142 /* If the load average is going to be needed while receiving a message, get it
4143 now for those OS that require the first call to os_getloadavg() to be done as
4144 root. There will be further calls later for each message received. */
4146 #ifdef LOAD_AVG_NEEDS_ROOT
4147 if (receiving_message &&
4148 (queue_only_load >= 0 ||
4149 (f.is_inetd && smtp_load_reserve >= 0)
4152 load_average = OS_GETLOADAVG();
4156 /* The queue_only configuration option can be overridden by -odx on the command
4157 line, except that if queue_only_override is false, queue_only cannot be unset
4158 from the command line. */
4160 if (queue_only_set && (queue_only_override || arg_queue_only))
4161 queue_only = arg_queue_only;
4163 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4166 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4167 if (arg_smtp_receive_timeout >= 0)
4168 smtp_receive_timeout = arg_smtp_receive_timeout;
4170 /* If Exim was started with root privilege, unless we have already removed the
4171 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4172 except when starting the daemon or doing some kind of delivery or address
4173 testing (-bt). These are the only cases when root need to be retained. We run
4174 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4175 retained only for starting the daemon. We always do the initgroups() in this
4176 situation (controlled by the TRUE below), in order to be as close as possible
4177 to the state Exim usually runs in. */
4179 if (!unprivileged && /* originally had root AND */
4180 !removed_privilege && /* still got root AND */
4181 !f.daemon_listen && /* not starting the daemon */
4182 queue_interval <= 0 && /* (either kind of daemon) */
4184 deliver_drop_privilege || /* requested unprivileged */
4186 queue_interval < 0 && /* not running the queue */
4187 (msg_action_arg < 0 || /* and */
4188 msg_action != MSG_DELIVER) && /* not delivering and */
4189 (!checking || !f.address_test_mode) /* not address checking */
4191 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4193 /* When we are retaining a privileged uid, we still change to the exim gid. */
4198 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4199 rv = setgid(exim_gid);
4200 /* Impact of failure is that some stuff might end up with an incorrect group.
4201 We track this for failures from root, since any attempt to change privilege
4202 by root should succeed and failures should be examined. For non-root,
4203 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4204 no need to complain then. */
4206 if (!(unprivileged || removed_privilege))
4207 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4209 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4210 (long int)exim_gid, strerror(errno));
4213 /* Handle a request to scan a file for malware */
4214 if (malware_test_file)
4216 #ifdef WITH_CONTENT_SCAN
4218 set_process_info("scanning file for malware");
4219 result = malware_in_file(malware_test_file);
4222 printf("No malware found.\n");
4227 printf("Malware lookup returned non-okay/fail: %d\n", result);
4231 printf("Malware found: %s\n", malware_name);
4233 printf("Malware scan detected malware of unknown name.\n");
4235 printf("Malware scanning not enabled at compile time.\n");
4240 /* Handle a request to list the delivery queue */
4244 set_process_info("listing the queue");
4245 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4249 /* Handle a request to count the delivery queue */
4253 set_process_info("counting the queue");
4258 /* Handle actions on specific messages, except for the force delivery and
4259 message load actions, which are done below. Some actions take a whole list of
4260 message ids, which are known to continue up to the end of the arguments. Others
4261 take a single message id and then operate on the recipients list. */
4263 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4265 int yield = EXIT_SUCCESS;
4266 set_process_info("acting on specified messages");
4268 /* ACL definitions may be needed when removing a message (-Mrm) because
4269 event_action gets expanded */
4271 if (msg_action == MSG_REMOVE)
4274 if (!one_msg_action)
4276 for (i = msg_action_arg; i < argc; i++)
4277 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4278 yield = EXIT_FAILURE;
4281 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4282 recipients_arg)) yield = EXIT_FAILURE;
4286 /* We used to set up here to skip reading the ACL section, on
4287 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4288 Now, since the intro of the ${acl } expansion, ACL definitions may be
4289 needed in transports so we lost the optimisation. */
4293 /* The configuration data will have been read into POOL_PERM because we won't
4294 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4295 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4296 configuration were read into POOL_MAIN, because we don't do any resets till
4297 later on. However, it seems right, and it does ensure that both pools get used.
4300 store_pool = POOL_MAIN;
4302 /* Handle the -brt option. This is for checking out retry configurations.
4303 The next three arguments are a domain name or a complete address, and
4304 optionally two error numbers. All it does is to call the function that
4305 scans the retry configuration data. */
4307 if (test_retry_arg >= 0)
4309 retry_config *yield;
4310 int basic_errno = 0;
4314 if (test_retry_arg >= argc)
4316 printf("-brt needs a domain or address argument\n");
4317 exim_exit(EXIT_FAILURE, US"main");
4319 s1 = argv[test_retry_arg++];
4322 /* If the first argument contains no @ and no . it might be a local user
4323 or it might be a single-component name. Treat as a domain. */
4325 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4327 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4328 "being \ntreated as a one-component domain, not as a local part.\n\n",
4332 /* There may be an optional second domain arg. */
4334 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4335 s2 = argv[test_retry_arg++];
4337 /* The final arg is an error name */
4339 if (test_retry_arg < argc)
4341 uschar *ss = argv[test_retry_arg];
4343 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4346 printf("%s\n", CS error);
4347 return EXIT_FAILURE;
4350 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4351 code > 100 as an error is for matching codes to the decade. Turn them into
4352 a real error code, off the decade. */
4354 if (basic_errno == ERRNO_MAIL4XX ||
4355 basic_errno == ERRNO_RCPT4XX ||
4356 basic_errno == ERRNO_DATA4XX)
4358 int code = (more_errno >> 8) & 255;
4360 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4361 else if (code > 100)
4362 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4366 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4367 printf("No retry information found\n");
4370 more_errno = yield->more_errno;
4371 printf("Retry rule: %s ", yield->pattern);
4373 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4375 printf("quota%s%s ",
4376 (more_errno > 0)? "_" : "",
4377 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4379 else if (yield->basic_errno == ECONNREFUSED)
4381 printf("refused%s%s ",
4382 (more_errno > 0)? "_" : "",
4383 (more_errno == 'M')? "MX" :
4384 (more_errno == 'A')? "A" : "");
4386 else if (yield->basic_errno == ETIMEDOUT)
4389 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4391 if (more_errno != 0) printf("_%s",
4392 (more_errno == 'M')? "MX" : "A");
4395 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4396 printf("auth_failed ");
4399 for (retry_rule * r = yield->rules; r; r = r->next)
4401 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4402 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4408 printf(",%d.", x/1000);
4422 exim_exit(EXIT_SUCCESS, US"main");
4425 /* Handle a request to list one or more configuration options */
4426 /* If -n was set, we suppress some information */
4431 set_process_info("listing variables");
4432 if (recipients_arg >= argc)
4433 fail = !readconf_print(US"all", NULL, flag_n);
4434 else for (i = recipients_arg; i < argc; i++)
4437 (Ustrcmp(argv[i], "router") == 0 ||
4438 Ustrcmp(argv[i], "transport") == 0 ||
4439 Ustrcmp(argv[i], "authenticator") == 0 ||
4440 Ustrcmp(argv[i], "macro") == 0 ||
4441 Ustrcmp(argv[i], "environment") == 0))
4443 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4447 fail = !readconf_print(argv[i], NULL, flag_n);
4449 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4454 set_process_info("listing config");
4455 exim_exit(readconf_print(US"config", NULL, flag_n)
4456 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4460 /* Initialise subsystems as required */
4461 #ifndef DISABLE_DKIM
4467 /* Handle a request to deliver one or more messages that are already on the
4468 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4469 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4471 Delivery of specific messages is typically used for a small number when
4472 prodding by hand (when the option forced_delivery will be set) or when
4473 re-execing to regain root privilege. Each message delivery must happen in a
4474 separate process, so we fork a process for each one, and run them sequentially
4475 so that debugging output doesn't get intertwined, and to avoid spawning too
4476 many processes if a long list is given. However, don't fork for the last one;
4477 this saves a process in the common case when Exim is called to deliver just one
4480 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4482 if (prod_requires_admin && !f.admin_user)
4484 fprintf(stderr, "exim: Permission denied\n");
4485 exim_exit(EXIT_FAILURE, US"main");
4487 set_process_info("delivering specified messages");
4488 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4489 for (i = msg_action_arg; i < argc; i++)
4494 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4495 else if ((pid = fork()) == 0)
4497 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4498 _exit(EXIT_SUCCESS);
4502 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4504 exim_exit(EXIT_FAILURE, US"main");
4508 exim_exit(EXIT_SUCCESS, US"main");
4512 /* If only a single queue run is requested, without SMTP listening, we can just
4513 turn into a queue runner, with an optional starting message id. */
4515 if (queue_interval == 0 && !f.daemon_listen)
4517 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4518 (start_queue_run_id == NULL)? US"" : US" starting at ",
4519 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4520 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4521 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4523 set_process_info("running the '%s' queue (single queue run)", queue_name);
4525 set_process_info("running the queue (single queue run)");
4526 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4527 exim_exit(EXIT_SUCCESS, US"main");
4531 /* Find the login name of the real user running this process. This is always
4532 needed when receiving a message, because it is written into the spool file. It
4533 may also be used to construct a from: or a sender: header, and in this case we
4534 need the user's full name as well, so save a copy of it, checked for RFC822
4535 syntax and munged if necessary, if it hasn't previously been set by the -F
4536 argument. We may try to get the passwd entry more than once, in case NIS or
4537 other delays are in evidence. Save the home directory for use in filter testing
4542 if ((pw = getpwuid(real_uid)) != NULL)
4544 originator_login = string_copy(US pw->pw_name);
4545 originator_home = string_copy(US pw->pw_dir);
4547 /* If user name has not been set by -F, set it from the passwd entry
4548 unless -f has been used to set the sender address by a trusted user. */
4550 if (!originator_name)
4552 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4554 uschar *name = US pw->pw_gecos;
4555 uschar *amp = Ustrchr(name, '&');
4558 /* Most Unix specify that a '&' character in the gecos field is
4559 replaced by a copy of the login name, and some even specify that
4560 the first character should be upper cased, so that's what we do. */
4565 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4566 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4567 buffer[loffset] = toupper(buffer[loffset]);
4571 /* If a pattern for matching the gecos field was supplied, apply
4572 it and then expand the name string. */
4574 if (gecos_pattern && gecos_name)
4577 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4579 if (regex_match_and_setup(re, name, 0, -1))
4581 uschar *new_name = expand_string(gecos_name);
4585 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4586 "gecos field \"%s\"\n", new_name, name);
4589 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4590 "\"%s\": %s\n", gecos_name, expand_string_message);
4592 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4593 "gecos field \"%s\"\n", gecos_pattern, name);
4594 store_free((void *)re);
4596 originator_name = string_copy(name);
4599 /* A trusted caller has used -f but not -F */
4601 else originator_name = US"";
4604 /* Break the retry loop */
4609 if (++i > finduser_retries) break;
4613 /* If we cannot get a user login, log the incident and give up, unless the
4614 configuration specifies something to use. When running in the test harness,
4615 any setting of unknown_login overrides the actual name. */
4617 if (originator_login == NULL || f.running_in_test_harness)
4619 if (unknown_login != NULL)
4621 originator_login = expand_string(unknown_login);
4622 if (originator_name == NULL && unknown_username != NULL)
4623 originator_name = expand_string(unknown_username);
4624 if (originator_name == NULL) originator_name = US"";
4626 if (originator_login == NULL)
4627 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4631 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4634 originator_name = string_copy(parse_fix_phrase(originator_name,
4635 Ustrlen(originator_name), big_buffer, big_buffer_size));
4637 /* If a message is created by this call of Exim, the uid/gid of its originator
4638 are those of the caller. These values are overridden if an existing message is
4639 read in from the spool. */
4641 originator_uid = real_uid;
4642 originator_gid = real_gid;
4644 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4645 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4647 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4648 returns. We leave this till here so that the originator_ fields are available
4649 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4652 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4656 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4657 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4658 "mua_wrapper is set");
4663 /* If the sender ident has not been set (by a trusted caller) set it to
4664 the caller. This will get overwritten below for an inetd call. If a trusted
4665 caller has set it empty, unset it. */
4667 if (sender_ident == NULL) sender_ident = originator_login;
4668 else if (sender_ident[0] == 0) sender_ident = NULL;
4670 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4671 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4672 originator_* variables set. */
4674 if (test_rewrite_arg >= 0)
4676 f.really_exim = FALSE;
4677 if (test_rewrite_arg >= argc)
4679 printf("-brw needs an address argument\n");
4680 exim_exit(EXIT_FAILURE, US"main");
4682 rewrite_test(argv[test_rewrite_arg]);
4683 exim_exit(EXIT_SUCCESS, US"main");
4686 /* A locally-supplied message is considered to be coming from a local user
4687 unless a trusted caller supplies a sender address with -f, or is passing in the
4688 message via SMTP (inetd invocation or otherwise). */
4690 if ((sender_address == NULL && !smtp_input) ||
4691 (!f.trusted_caller && filter_test == FTEST_NONE))
4693 f.sender_local = TRUE;
4695 /* A trusted caller can supply authenticated_sender and authenticated_id
4696 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4697 defaults except when host checking. */
4699 if (authenticated_sender == NULL && !host_checking)
4700 authenticated_sender = string_sprintf("%s@%s", originator_login,
4701 qualify_domain_sender);
4702 if (authenticated_id == NULL && !host_checking)
4703 authenticated_id = originator_login;
4706 /* Trusted callers are always permitted to specify the sender address.
4707 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4708 is specified is the empty address. However, if a trusted caller does not
4709 specify a sender address for SMTP input, we leave sender_address unset. This
4710 causes the MAIL commands to be honoured. */
4712 if ((!smtp_input && sender_address == NULL) ||
4713 !receive_check_set_sender(sender_address))
4715 /* Either the caller is not permitted to set a general sender, or this is
4716 non-SMTP input and the trusted caller has not set a sender. If there is no
4717 sender, or if a sender other than <> is set, override with the originator's
4718 login (which will get qualified below), except when checking things. */
4720 if (sender_address == NULL /* No sender_address set */
4722 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4723 !checking)) /* Not running tests, including filter tests */
4725 sender_address = originator_login;
4726 f.sender_address_forced = FALSE;
4727 sender_address_domain = 0;
4731 /* Remember whether an untrusted caller set the sender address */
4733 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4735 /* Ensure that the sender address is fully qualified unless it is the empty
4736 address, which indicates an error message, or doesn't exist (root caller, smtp
4737 interface, no -f argument). */
4739 if (sender_address != NULL && sender_address[0] != 0 &&
4740 sender_address_domain == 0)
4741 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4742 qualify_domain_sender);
4744 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4746 /* Handle a request to verify a list of addresses, or test them for delivery.
4747 This must follow the setting of the sender address, since routers can be
4748 predicated upon the sender. If no arguments are given, read addresses from
4749 stdin. Set debug_level to at least D_v to get full output for address testing.
4752 if (verify_address_mode || f.address_test_mode)
4755 int flags = vopt_qualify;
4757 if (verify_address_mode)
4759 if (!verify_as_sender) flags |= vopt_is_recipient;
4760 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4765 flags |= vopt_is_recipient;
4766 debug_selector |= D_v;
4767 debug_file = stderr;
4768 debug_fd = fileno(debug_file);
4769 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4772 if (recipients_arg < argc)
4774 while (recipients_arg < argc)
4776 uschar *s = argv[recipients_arg++];
4779 BOOL finished = FALSE;
4780 uschar *ss = parse_find_address_end(s, FALSE);
4781 if (*ss == ',') *ss = 0; else finished = TRUE;
4782 test_address(s, flags, &exit_value);
4785 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4792 uschar *s = get_stdinput(NULL, NULL);
4793 if (s == NULL) break;
4794 test_address(s, flags, &exit_value);
4798 exim_exit(exit_value, US"main");
4801 /* Handle expansion checking. Either expand items on the command line, or read
4802 from stdin if there aren't any. If -Mset was specified, load the message so
4803 that its variables can be used, but restrict this facility to admin users.
4804 Otherwise, if -bem was used, read a message from stdin. */
4808 dns_init(FALSE, FALSE, FALSE);
4809 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4811 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4813 exim_fail("exim: permission denied\n");
4814 message_id = argv[msg_action_arg];
4815 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4816 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4817 printf ("Failed to load message datafile %s\n", message_id);
4818 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4819 printf ("Failed to load message %s\n", message_id);
4822 /* Read a test message from a file. We fudge it up to be on stdin, saving
4823 stdin itself for later reading of expansion strings. */
4825 else if (expansion_test_message)
4827 int save_stdin = dup(0);
4828 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4830 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4833 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4834 message_ended = END_NOTENDED;
4835 read_message_body(receive_msg(extract_recipients));
4836 message_linecount += body_linecount;
4837 (void)dup2(save_stdin, 0);
4838 (void)close(save_stdin);
4839 clearerr(stdin); /* Required by Darwin */
4842 /* Only admin users may see config-file macros this way */
4844 if (!f.admin_user) macros_user = macros = mlast = NULL;
4846 /* Allow $recipients for this testing */
4848 f.enable_dollar_recipients = TRUE;
4850 /* Expand command line items */
4852 if (recipients_arg < argc)
4853 while (recipients_arg < argc)
4854 expansion_test_line(argv[recipients_arg++]);
4860 char *(*fn_readline)(const char *) = NULL;
4861 void (*fn_addhist)(const char *) = NULL;
4865 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4868 while (s = get_stdinput(fn_readline, fn_addhist))
4869 expansion_test_line(s);
4872 if (dlhandle) dlclose(dlhandle);
4876 /* The data file will be open after -Mset */
4878 if (deliver_datafile >= 0)
4880 (void)close(deliver_datafile);
4881 deliver_datafile = -1;
4884 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4888 /* The active host name is normally the primary host name, but it can be varied
4889 for hosts that want to play several parts at once. We need to ensure that it is
4890 set for host checking, and for receiving messages. */
4892 smtp_active_hostname = primary_hostname;
4893 if (raw_active_hostname != NULL)
4895 uschar *nah = expand_string(raw_active_hostname);
4898 if (!f.expand_string_forcedfail)
4899 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4900 "(smtp_active_hostname): %s", raw_active_hostname,
4901 expand_string_message);
4903 else if (nah[0] != 0) smtp_active_hostname = nah;
4906 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4907 given IP address so that the blocking and relay configuration can be tested.
4908 Unless a sender_ident was set by -oMt, we discard it (the default is the
4909 caller's login name). An RFC 1413 call is made only if we are running in the
4910 test harness and an incoming interface and both ports are specified, because
4911 there is no TCP/IP call to find the ident for. */
4918 if (!sender_ident_set)
4920 sender_ident = NULL;
4921 if (f.running_in_test_harness && sender_host_port != 0 &&
4922 interface_address != NULL && interface_port != 0)
4923 verify_get_ident(1413);
4926 /* In case the given address is a non-canonical IPv6 address, canonicalize
4927 it. The code works for both IPv4 and IPv6, as it happens. */
4929 size = host_aton(sender_host_address, x);
4930 sender_host_address = store_get(48); /* large enough for full IPv6 */
4931 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4933 /* Now set up for testing */
4935 host_build_sender_fullhost();
4939 f.sender_local = FALSE;
4940 f.sender_host_notsocket = TRUE;
4941 debug_file = stderr;
4942 debug_fd = fileno(debug_file);
4943 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4944 "**** but without any ident (RFC 1413) callback.\n"
4945 "**** This is not for real!\n\n",
4946 sender_host_address);
4948 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4949 if (verify_check_host(&hosts_connection_nolog) == OK)
4950 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4951 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4953 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4954 because a log line has already been written for all its failure exists
4955 (usually "connection refused: <reason>") and writing another one is
4956 unnecessary clutter. */
4958 if (smtp_start_session())
4960 for (reset_point = store_get(0); ; store_reset(reset_point))
4962 if (smtp_setup_msg() <= 0) break;
4963 if (!receive_msg(FALSE)) break;
4965 return_path = sender_address = NULL;
4966 dnslist_domain = dnslist_matched = NULL;
4967 #ifndef DISABLE_DKIM
4968 dkim_cur_signer = NULL;
4971 deliver_localpart_orig = NULL;
4972 deliver_domain_orig = NULL;
4973 callout_address = sending_ip_address = NULL;
4974 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4978 exim_exit(EXIT_SUCCESS, US"main");
4982 /* Arrange for message reception if recipients or SMTP were specified;
4983 otherwise complain unless a version print (-bV) happened or this is a filter
4984 verification test or info dump.
4985 In the former case, show the configuration file name. */
4987 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4989 if (version_printed)
4991 if (Ustrchr(config_main_filelist, ':'))
4992 printf("Configuration file search path is %s\n", config_main_filelist);
4993 printf("Configuration file is %s\n", config_main_filename);
4994 return EXIT_SUCCESS;
4997 if (info_flag != CMDINFO_NONE)
4999 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5000 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5003 if (filter_test == FTEST_NONE)
5004 exim_usage(called_as);
5008 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5009 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5010 that we are not called from inetd, because that is rejected above. The
5011 following configuration settings are forced here:
5013 (1) Synchronous delivery (-odi)
5014 (2) Errors to stderr (-oep == -oeq)
5015 (3) No parallel remote delivery
5016 (4) Unprivileged delivery
5018 We don't force overall queueing options because there are several of them;
5019 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5020 to override any SMTP queueing. */
5024 f.synchronous_delivery = TRUE;
5025 arg_error_handling = ERRORS_STDERR;
5026 remote_max_parallel = 1;
5027 deliver_drop_privilege = TRUE;
5028 f.queue_smtp = FALSE;
5029 queue_smtp_domains = NULL;
5031 message_utf8_downconvert = -1; /* convert-if-needed */
5036 /* Prepare to accept one or more new messages on the standard input. When a
5037 message has been read, its id is returned in message_id[]. If doing immediate
5038 delivery, we fork a delivery process for each received message, except for the
5039 last one, where we can save a process switch.
5041 It is only in non-smtp mode that error_handling is allowed to be changed from
5042 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5043 sendmail error modes other than -oem ever actually used? Later: yes.) */
5045 if (!smtp_input) error_handling = arg_error_handling;
5047 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5048 logging being sent down the socket and make an identd call to get the
5051 else if (f.is_inetd)
5053 (void)fclose(stderr);
5054 exim_nullstd(); /* Re-open to /dev/null */
5055 verify_get_ident(IDENT_PORT);
5056 host_build_sender_fullhost();
5057 set_process_info("handling incoming connection from %s via inetd",
5061 /* If the sender host address has been set, build sender_fullhost if it hasn't
5062 already been done (which it will have been for inetd). This caters for the
5063 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5064 so that the test for IP options is skipped for -bs input. */
5066 if (sender_host_address && !sender_fullhost)
5068 host_build_sender_fullhost();
5069 set_process_info("handling incoming connection from %s via -oMa",
5071 f.sender_host_notsocket = TRUE;
5074 /* Otherwise, set the sender host as unknown except for inetd calls. This
5075 prevents host checking in the case of -bs not from inetd and also for -bS. */
5077 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5079 /* If stdout does not exist, then dup stdin to stdout. This can happen
5080 if exim is started from inetd. In this case fd 0 will be set to the socket,
5081 but fd 1 will not be set. This also happens for passed SMTP channels. */
5083 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5085 /* Set up the incoming protocol name and the state of the program. Root is
5086 allowed to force received protocol via the -oMr option above. If we have come
5087 via inetd, the process info has already been set up. We don't set
5088 received_protocol here for smtp input, as it varies according to
5089 batch/HELO/EHLO/AUTH/TLS. */
5093 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5094 smtp_batched_input? "batched " : "",
5095 (sender_address!= NULL)? sender_address : originator_login);
5099 int old_pool = store_pool;
5100 store_pool = POOL_PERM;
5101 if (!received_protocol)
5102 received_protocol = string_sprintf("local%s", called_as);
5103 store_pool = old_pool;
5104 set_process_info("accepting a local non-SMTP message from <%s>",
5108 /* Initialize the session_local_queue-only flag (this will be ignored if
5109 mua_wrapper is set) */
5112 session_local_queue_only = queue_only;
5114 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5115 the spool if so configured. On failure, we must not attempt to send an error
5116 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5117 error code is given.) */
5119 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5120 exim_fail("exim: insufficient disk space\n");
5122 /* If this is smtp input of any kind, real or batched, handle the start of the
5125 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5126 because a log line has already been written for all its failure exists
5127 (usually "connection refused: <reason>") and writing another one is
5128 unnecessary clutter. */
5134 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5135 if (verify_check_host(&hosts_connection_nolog) == OK)
5136 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5137 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5138 if (!smtp_start_session())
5141 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5145 /* Otherwise, set up the input size limit here. */
5149 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5150 if (expand_string_message)
5151 if (thismessage_size_limit == -1)
5152 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5153 "message_size_limit: %s", expand_string_message);
5155 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5156 "message_size_limit: %s", expand_string_message);
5159 /* Loop for several messages when reading SMTP input. If we fork any child
5160 processes, we don't want to wait for them unless synchronous delivery is
5161 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5162 same as SIG_DFL, despite the fact that documentation often lists the default as
5163 "ignore". This is a confusing area. This is what I know:
5165 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5166 processes that complete simply to go away without ever becoming defunct. You
5167 can't then wait for them - but we don't want to wait for them in the
5168 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5169 happen for all OS (e.g. *BSD is different).
5171 But that's not the end of the story. Some (many? all?) systems have the
5172 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5173 has by default, so it seems that the difference is merely one of default
5174 (compare restarting vs non-restarting signals).
5176 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5177 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5178 of the loop below. Paranoia rules.
5180 February 2003: That's *still* not the end of the story. There are now versions
5181 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5182 process then calls waitpid(), a grumble is written to the system log, because
5183 this is logically inconsistent. In other words, it doesn't like the paranoia.
5184 As a consequence of this, the waitpid() below is now excluded if we are sure
5185 that SIG_IGN works. */
5187 if (!f.synchronous_delivery)
5190 struct sigaction act;
5191 act.sa_handler = SIG_IGN;
5192 sigemptyset(&(act.sa_mask));
5193 act.sa_flags = SA_NOCLDWAIT;
5194 sigaction(SIGCHLD, &act, NULL);
5196 signal(SIGCHLD, SIG_IGN);
5200 /* Save the current store pool point, for resetting at the start of
5201 each message, and save the real sender address, if any. */
5203 reset_point = store_get(0);
5204 real_sender_address = sender_address;
5206 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5207 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5214 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5215 input and build the recipients list, before calling receive_msg() to read the
5216 message proper. Whatever sender address is given in the SMTP transaction is
5217 often ignored for local senders - we use the actual sender, which is normally
5218 either the underlying user running this process or a -f argument provided by
5219 a trusted caller. It is saved in real_sender_address. The test for whether to
5220 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5225 if ((rc = smtp_setup_msg()) > 0)
5227 if (real_sender_address != NULL &&
5228 !receive_check_set_sender(sender_address))
5230 sender_address = raw_sender = real_sender_address;
5231 sender_address_unrewritten = NULL;
5234 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5235 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5236 the very end. The result of the ACL is ignored (as for other non-SMTP
5237 messages). It is run for its potential side effects. */
5239 if (smtp_batched_input && acl_not_smtp_start != NULL)
5241 uschar *user_msg, *log_msg;
5242 f.enable_dollar_recipients = TRUE;
5243 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5244 &user_msg, &log_msg);
5245 f.enable_dollar_recipients = FALSE;
5248 /* Now get the data for the message */
5250 more = receive_msg(extract_recipients);
5251 if (message_id[0] == 0)
5253 cancel_cutthrough_connection(TRUE, US"receive dropped");
5254 if (more) goto moreloop;
5255 smtp_log_no_mail(); /* Log no mail if configured */
5256 exim_exit(EXIT_FAILURE, US"receive toplevel");
5261 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5262 smtp_log_no_mail(); /* Log no mail if configured */
5263 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5267 /* In the non-SMTP case, we have all the information from the command
5268 line, but must process it in case it is in the more general RFC822
5269 format, and in any case, to detect syntax errors. Also, it appears that
5270 the use of comma-separated lists as single arguments is common, so we
5271 had better support them. */
5276 int count = argc - recipients_arg;
5277 uschar **list = argv + recipients_arg;
5279 /* These options cannot be changed dynamically for non-SMTP messages */
5281 f.active_local_sender_retain = local_sender_retain;
5282 f.active_local_from_check = local_from_check;
5284 /* Save before any rewriting */
5286 raw_sender = string_copy(sender_address);
5288 /* Loop for each argument */
5290 for (int i = 0; i < count; i++)
5292 int start, end, domain;
5294 uschar *s = list[i];
5296 /* Loop for each comma-separated address */
5300 BOOL finished = FALSE;
5302 uschar *ss = parse_find_address_end(s, FALSE);
5304 if (*ss == ',') *ss = 0; else finished = TRUE;
5306 /* Check max recipients - if -t was used, these aren't recipients */
5308 if (recipients_max > 0 && ++rcount > recipients_max &&
5309 !extract_recipients)
5310 if (error_handling == ERRORS_STDERR)
5312 fprintf(stderr, "exim: too many recipients\n");
5313 exim_exit(EXIT_FAILURE, US"main");
5317 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5318 errors_sender_rc : EXIT_FAILURE;
5322 BOOL b = allow_utf8_domains;
5323 allow_utf8_domains = TRUE;
5326 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5329 if (string_is_utf8(recipient))
5330 message_smtputf8 = TRUE;
5332 allow_utf8_domains = b;
5335 if (domain == 0 && !f.allow_unqualified_recipient)
5338 errmess = US"unqualified recipient address not allowed";
5341 if (recipient == NULL)
5343 if (error_handling == ERRORS_STDERR)
5345 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5346 string_printing(list[i]), errmess);
5347 exim_exit(EXIT_FAILURE, US"main");
5353 eblock.text1 = string_printing(list[i]);
5354 eblock.text2 = errmess;
5356 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5357 errors_sender_rc : EXIT_FAILURE;
5361 receive_add_recipient(recipient, -1);
5364 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5368 /* Show the recipients when debugging */
5372 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5373 if (recipients_list != NULL)
5375 debug_printf("Recipients:\n");
5376 for (int i = 0; i < recipients_count; i++)
5377 debug_printf(" %s\n", recipients_list[i].address);
5381 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5382 ignored; rejecting here would just add complication, and it can just as
5383 well be done later. Allow $recipients to be visible in the ACL. */
5385 if (acl_not_smtp_start)
5387 uschar *user_msg, *log_msg;
5388 f.enable_dollar_recipients = TRUE;
5389 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5390 &user_msg, &log_msg);
5391 f.enable_dollar_recipients = FALSE;
5394 /* Pause for a while waiting for input. If none received in that time,
5395 close the logfile, if we had one open; then if we wait for a long-running
5396 datasource (months, in one use-case) log rotation will not leave us holding
5399 if (!receive_timeout)
5401 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5404 FD_ZERO(&r); FD_SET(0, &r);
5405 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5408 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5409 will just read the headers for the message, and not write anything onto the
5412 message_ended = END_NOTENDED;
5413 more = receive_msg(extract_recipients);
5415 /* more is always FALSE here (not SMTP message) when reading a message
5416 for real; when reading the headers of a message for filter testing,
5417 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5419 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5420 } /* Non-SMTP message reception */
5422 /* If this is a filter testing run, there are headers in store, but
5423 no message on the spool. Run the filtering code in testing mode, setting
5424 the domain to the qualify domain and the local part to the current user,
5425 unless they have been set by options. The prefix and suffix are left unset
5426 unless specified. The the return path is set to to the sender unless it has
5427 already been set from a return-path header in the message. */
5429 if (filter_test != FTEST_NONE)
5431 deliver_domain = (ftest_domain != NULL)?
5432 ftest_domain : qualify_domain_recipient;
5433 deliver_domain_orig = deliver_domain;
5434 deliver_localpart = (ftest_localpart != NULL)?
5435 ftest_localpart : originator_login;
5436 deliver_localpart_orig = deliver_localpart;
5437 deliver_localpart_prefix = ftest_prefix;
5438 deliver_localpart_suffix = ftest_suffix;
5439 deliver_home = originator_home;
5441 if (return_path == NULL)
5443 printf("Return-path copied from sender\n");
5444 return_path = string_copy(sender_address);
5447 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5448 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5450 receive_add_recipient(
5451 string_sprintf("%s%s%s@%s",
5452 (ftest_prefix == NULL)? US"" : ftest_prefix,
5454 (ftest_suffix == NULL)? US"" : ftest_suffix,
5455 deliver_domain), -1);
5457 printf("Recipient = %s\n", recipients_list[0].address);
5458 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5459 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5461 if (chdir("/")) /* Get away from wherever the user is running this from */
5463 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5464 exim_exit(EXIT_FAILURE, US"main");
5467 /* Now we run either a system filter test, or a user filter test, or both.
5468 In the latter case, headers added by the system filter will persist and be
5469 available to the user filter. We need to copy the filter variables
5472 if ((filter_test & FTEST_SYSTEM) != 0)
5473 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5474 exim_exit(EXIT_FAILURE, US"main");
5476 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5478 if ((filter_test & FTEST_USER) != 0)
5479 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5480 exim_exit(EXIT_FAILURE, US"main");
5482 exim_exit(EXIT_SUCCESS, US"main");
5485 /* Else act on the result of message reception. We should not get here unless
5486 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5487 will be TRUE. If it is not, check on the number of messages received in this
5490 if (!session_local_queue_only &&
5491 smtp_accept_queue_per_connection > 0 &&
5492 receive_messagecount > smtp_accept_queue_per_connection)
5494 session_local_queue_only = TRUE;
5495 queue_only_reason = 2;
5498 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5499 and queue_only_load is set, check that the load average is below it. If it is
5500 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5501 default), we put the whole session into queue_only mode. It then remains this
5502 way for any subsequent messages on the same SMTP connection. This is a
5503 deliberate choice; even though the load average may fall, it doesn't seem
5504 right to deliver later messages on the same call when not delivering earlier
5505 ones. However, there are odd cases where this is not wanted, so this can be
5506 changed by setting queue_only_load_latch false. */
5508 local_queue_only = session_local_queue_only;
5509 if (!local_queue_only && queue_only_load >= 0)
5511 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5512 if (local_queue_only)
5514 queue_only_reason = 3;
5515 if (queue_only_load_latch) session_local_queue_only = TRUE;
5519 /* If running as an MUA wrapper, all queueing options and freezing options
5523 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5525 /* Log the queueing here, when it will get a message id attached, but
5526 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5529 if (local_queue_only)
5531 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5532 switch(queue_only_reason)
5535 log_write(L_delay_delivery,
5536 LOG_MAIN, "no immediate delivery: more than %d messages "
5537 "received in one connection", smtp_accept_queue_per_connection);
5541 log_write(L_delay_delivery,
5542 LOG_MAIN, "no immediate delivery: load average %.2f",
5543 (double)load_average/1000.0);
5548 else if (f.queue_only_policy || f.deliver_freeze)
5549 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5551 /* Else do the delivery unless the ACL or local_scan() called for queue only
5552 or froze the message. Always deliver in a separate process. A fork failure is
5553 not a disaster, as the delivery will eventually happen on a subsequent queue
5554 run. The search cache must be tidied before the fork, as the parent will
5555 do it before exiting. The child will trigger a lookup failure and
5556 thereby defer the delivery if it tries to use (for example) a cached ldap
5557 connection that the parent has called unbind on. */
5564 if ((pid = fork()) == 0)
5567 close_unwanted(); /* Close unwanted file descriptors and TLS */
5568 exim_nullstd(); /* Ensure std{in,out,err} exist */
5570 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5571 mode, deliver_drop_privilege is forced TRUE). */
5573 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5575 delivery_re_exec(CEE_EXEC_EXIT);
5576 /* Control does not return here. */
5579 /* No need to re-exec */
5581 rc = deliver_message(message_id, FALSE, FALSE);
5583 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5584 EXIT_SUCCESS : EXIT_FAILURE);
5589 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5590 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5591 "process: %s", strerror(errno));
5595 release_cutthrough_connection(US"msg passed for delivery");
5597 /* In the parent, wait if synchronous delivery is required. This will
5598 always be the case in MUA wrapper mode. */
5600 if (f.synchronous_delivery)
5603 while (wait(&status) != pid);
5604 if ((status & 0x00ff) != 0)
5605 log_write(0, LOG_MAIN|LOG_PANIC,
5606 "process %d crashed with signal %d while delivering %s",
5607 (int)pid, status & 0x00ff, message_id);
5608 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5613 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5614 automatically reaps children (see comments above the loop), clear away any
5615 finished subprocesses here, in case there are lots of messages coming in
5616 from the same source. */
5618 #ifndef SIG_IGN_WORKS
5619 while (waitpid(-1, NULL, WNOHANG) > 0);
5623 return_path = sender_address = NULL;
5624 authenticated_sender = NULL;
5625 deliver_localpart_orig = NULL;
5626 deliver_domain_orig = NULL;
5627 deliver_host = deliver_host_address = NULL;
5628 dnslist_domain = dnslist_matched = NULL;
5629 #ifdef WITH_CONTENT_SCAN
5630 malware_name = NULL;
5632 callout_address = NULL;
5633 sending_ip_address = NULL;
5635 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5637 store_reset(reset_point);
5640 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5641 return 0; /* To stop compiler warning */