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");
862 fprintf(fp, " GnuTLS");
864 fprintf(fp, " OpenSSL");
867 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
868 fprintf(fp, " translate_ip_address");
870 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
871 fprintf(fp, " move_frozen_messages");
873 #ifdef WITH_CONTENT_SCAN
874 fprintf(fp, " Content_Scanning");
877 fprintf(fp, " DANE");
880 fprintf(fp, " DKIM");
882 #ifndef DISABLE_DNSSEC
883 fprintf(fp, " DNSSEC");
885 #ifndef DISABLE_EVENT
886 fprintf(fp, " Event");
889 fprintf(fp, " I18N");
892 fprintf(fp, " OCSP");
895 fprintf(fp, " PRDR");
898 fprintf(fp, " PROXY");
901 fprintf(fp, " SOCKS");
908 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
910 #ifdef EXPERIMENTAL_LMDB
911 fprintf(fp, " Experimental_LMDB");
913 #ifdef EXPERIMENTAL_QUEUEFILE
914 fprintf(fp, " Experimental_QUEUEFILE");
916 #ifdef EXPERIMENTAL_SRS
917 fprintf(fp, " Experimental_SRS");
919 #ifdef EXPERIMENTAL_ARC
920 fprintf(fp, " Experimental_ARC");
922 #ifdef EXPERIMENTAL_BRIGHTMAIL
923 fprintf(fp, " Experimental_Brightmail");
925 #ifdef EXPERIMENTAL_DCC
926 fprintf(fp, " Experimental_DCC");
928 #ifdef EXPERIMENTAL_DMARC
929 fprintf(fp, " Experimental_DMARC");
931 #ifdef EXPERIMENTAL_DSN_INFO
932 fprintf(fp, " Experimental_DSN_info");
934 #ifdef EXPERIMENTAL_PIPE_CONNECT
935 fprintf(fp, " Experimental_PIPE_CONNECT");
937 #ifdef EXPERIMENTAL_TLS_RESUME
938 fprintf(fp, " Experimental_TLS_resume");
942 fprintf(fp, "Lookups (built-in):");
943 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
944 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
946 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
949 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
950 fprintf(fp, " dbm dbmjz dbmnz");
952 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
953 fprintf(fp, " dnsdb");
955 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
956 fprintf(fp, " dsearch");
958 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
959 fprintf(fp, " ibase");
961 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
962 fprintf(fp, " json");
964 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
965 fprintf(fp, " ldap ldapdn ldapm");
967 #ifdef EXPERIMENTAL_LMDB
968 fprintf(fp, " lmdb");
970 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
971 fprintf(fp, " mysql");
973 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
974 fprintf(fp, " nis nis0");
976 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
977 fprintf(fp, " nisplus");
979 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
980 fprintf(fp, " oracle");
982 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
983 fprintf(fp, " passwd");
985 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
986 fprintf(fp, " pgsql");
988 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
989 fprintf(fp, " redis");
991 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
992 fprintf(fp, " sqlite");
994 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
995 fprintf(fp, " testdb");
997 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
998 fprintf(fp, " whoson");
1002 auth_show_supported(fp);
1003 route_show_supported(fp);
1004 transport_show_supported(fp);
1006 #ifdef WITH_CONTENT_SCAN
1007 malware_show_supported(fp);
1010 if (fixed_never_users[0] > 0)
1013 fprintf(fp, "Fixed never_users: ");
1014 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1015 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
1016 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
1019 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
1021 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1023 /* Everything else is details which are only worth reporting when debugging.
1024 Perhaps the tls_version_report should move into this too. */
1027 /* clang defines __GNUC__ (at least, for me) so test for it first */
1028 #if defined(__clang__)
1029 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1030 #elif defined(__GNUC__)
1031 fprintf(fp, "Compiler: GCC [%s]\n",
1035 "? unknown version ?"
1039 fprintf(fp, "Compiler: <unknown>\n");
1042 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1043 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1044 __GLIBC__, __GLIBC_MINOR__);
1045 if (__GLIBC_PREREQ(2, 1))
1046 fprintf(fp, " Runtime: %s\n",
1047 gnu_get_libc_version());
1050 show_db_version(fp);
1053 tls_version_report(fp);
1056 utf8_version_report(fp);
1059 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1060 if (authi->version_report)
1061 (*authi->version_report)(fp);
1063 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1064 characters; unless it's an ancient version of PCRE in which case it
1066 #ifndef PCRE_PRERELEASE
1067 # define PCRE_PRERELEASE
1070 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1071 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1073 PCRE_MAJOR, PCRE_MINOR,
1074 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1077 #undef EXPAND_AND_QUOTE
1080 for (int i = 0; i < lookup_list_count; i++)
1081 if (lookup_list[i]->version_report)
1082 lookup_list[i]->version_report(fp);
1084 #ifdef WHITELIST_D_MACROS
1085 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1087 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1089 #ifdef TRUSTED_CONFIG_LIST
1090 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1092 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1099 /*************************************************
1100 * Show auxiliary information about Exim *
1101 *************************************************/
1104 show_exim_information(enum commandline_info request, FILE *stream)
1109 fprintf(stream, "Oops, something went wrong.\n");
1113 "The -bI: flag takes a string indicating which information to provide.\n"
1114 "If the string is not recognised, you'll get this help (on stderr).\n"
1116 " exim -bI:help this information\n"
1117 " exim -bI:dscp list of known dscp value keywords\n"
1118 " exim -bI:sieve list of supported sieve extensions\n"
1122 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1123 fprintf(stream, "%s\n", *pp);
1126 dscp_list_to_stream(stream);
1132 /*************************************************
1133 * Quote a local part *
1134 *************************************************/
1136 /* This function is used when a sender address or a From: or Sender: header
1137 line is being created from the caller's login, or from an authenticated_id. It
1138 applies appropriate quoting rules for a local part.
1140 Argument: the local part
1141 Returns: the local part, quoted if necessary
1145 local_part_quote(uschar *lpart)
1147 BOOL needs_quote = FALSE;
1150 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1152 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1153 (*t != '.' || t == lpart || t[1] == 0);
1156 if (!needs_quote) return lpart;
1158 g = string_catn(NULL, US"\"", 1);
1162 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1165 g = string_cat(g, lpart);
1168 g = string_catn(g, lpart, nq - lpart);
1169 g = string_catn(g, US"\\", 1);
1170 g = string_catn(g, nq, 1);
1174 g = string_catn(g, US"\"", 1);
1175 return string_from_gstring(g);
1181 /*************************************************
1182 * Load readline() functions *
1183 *************************************************/
1185 /* This function is called from testing executions that read data from stdin,
1186 but only when running as the calling user. Currently, only -be does this. The
1187 function loads the readline() function library and passes back the functions.
1188 On some systems, it needs the curses library, so load that too, but try without
1189 it if loading fails. All this functionality has to be requested at build time.
1192 fn_readline_ptr pointer to where to put the readline pointer
1193 fn_addhist_ptr pointer to where to put the addhistory function
1195 Returns: the dlopen handle or NULL on failure
1199 set_readline(char * (**fn_readline_ptr)(const char *),
1200 void (**fn_addhist_ptr)(const char *))
1203 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1205 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1206 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1208 if (dlhandle != NULL)
1210 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1211 * char * readline (const char *prompt);
1212 * void add_history (const char *string);
1214 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1215 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1219 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1228 /*************************************************
1229 * Get a line from stdin for testing things *
1230 *************************************************/
1232 /* This function is called when running tests that can take a number of lines
1233 of input (for example, -be and -bt). It handles continuations and trailing
1234 spaces. And prompting and a blank line output on eof. If readline() is in use,
1235 the arguments are non-NULL and provide the relevant functions.
1238 fn_readline readline function or NULL
1239 fn_addhist addhist function or NULL
1241 Returns: pointer to dynamic memory, or NULL at end of file
1245 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1249 if (!fn_readline) { printf("> "); fflush(stdout); }
1251 for (int i = 0;; i++)
1253 uschar buffer[1024];
1257 char *readline_line = NULL;
1258 if (fn_readline != NULL)
1260 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1261 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1262 p = US readline_line;
1267 /* readline() not in use */
1270 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1274 /* Handle the line */
1276 ss = p + (int)Ustrlen(p);
1277 while (ss > p && isspace(ss[-1])) ss--;
1281 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1284 g = string_catn(g, p, ss - p);
1287 if (fn_readline) free(readline_line);
1290 /* g can only be NULL if ss==p */
1291 if (ss == p || g->s[g->ptr-1] != '\\')
1295 (void) string_from_gstring(g);
1298 if (!g) printf("\n");
1299 return string_from_gstring(g);
1304 /*************************************************
1305 * Output usage information for the program *
1306 *************************************************/
1308 /* This function is called when there are no recipients
1309 or a specific --help argument was added.
1312 progname information on what name we were called by
1314 Returns: DOES NOT RETURN
1318 exim_usage(uschar *progname)
1321 /* Handle specific program invocation variants */
1322 if (Ustrcmp(progname, US"-mailq") == 0)
1324 "mailq - list the contents of the mail queue\n\n"
1325 "For a list of options, see the Exim documentation.\n");
1327 /* Generic usage - we output this whatever happens */
1329 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1330 "not directly from a shell command line. Options and/or arguments control\n"
1331 "what it does when called. For a list of options, see the Exim documentation.\n");
1336 /*************************************************
1337 * Validate that the macros given are okay *
1338 *************************************************/
1340 /* Typically, Exim will drop privileges if macros are supplied. In some
1341 cases, we want to not do so.
1343 Arguments: opt_D_used - true if the commandline had a "-D" option
1344 Returns: true if trusted, false otherwise
1348 macros_trusted(BOOL opt_D_used)
1350 #ifdef WHITELIST_D_MACROS
1351 uschar *whitelisted, *end, *p, **whites;
1352 int white_count, i, n;
1354 BOOL prev_char_item, found;
1359 #ifndef WHITELIST_D_MACROS
1363 /* We only trust -D overrides for some invoking users:
1364 root, the exim run-time user, the optional config owner user.
1365 I don't know why config-owner would be needed, but since they can own the
1366 config files anyway, there's no security risk to letting them override -D. */
1367 if ( ! ((real_uid == root_uid)
1368 || (real_uid == exim_uid)
1369 #ifdef CONFIGURE_OWNER
1370 || (real_uid == config_uid)
1374 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1378 /* Get a list of macros which are whitelisted */
1379 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1380 prev_char_item = FALSE;
1382 for (p = whitelisted; *p != '\0'; ++p)
1384 if (*p == ':' || isspace(*p))
1389 prev_char_item = FALSE;
1392 if (!prev_char_item)
1393 prev_char_item = TRUE;
1400 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1401 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1406 if (i == white_count)
1408 while (*p != '\0' && p < end)
1414 /* The list of commandline macros should be very short.
1415 Accept the N*M complexity. */
1416 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1419 for (uschar ** w = whites; *w; ++w)
1420 if (Ustrcmp(*w, m->name) == 0)
1427 if (!m->replacement)
1429 if ((len = m->replen) == 0)
1431 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1432 0, PCRE_EOPT, NULL, 0);
1435 if (n != PCRE_ERROR_NOMATCH)
1436 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1440 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1446 /*************************************************
1447 * Expansion testing *
1448 *************************************************/
1450 /* Expand and print one item, doing macro-processing.
1453 item line for expansion
1457 expansion_test_line(uschar * line)
1462 Ustrncpy(big_buffer, line, big_buffer_size);
1463 big_buffer[big_buffer_size-1] = '\0';
1464 len = Ustrlen(big_buffer);
1466 (void) macros_expand(0, &len, &dummy_macexp);
1468 if (isupper(big_buffer[0]))
1470 if (macro_read_assignment(big_buffer))
1471 printf("Defined macro '%s'\n", mlast->name);
1474 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1475 else printf("Failed: %s\n", expand_string_message);
1480 /*************************************************
1481 * Entry point and high-level code *
1482 *************************************************/
1484 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1485 the appropriate action. All the necessary functions are present in the one
1486 binary. I originally thought one should split it up, but it turns out that so
1487 much of the apparatus is needed in each chunk that one might as well just have
1488 it all available all the time, which then makes the coding easier as well.
1491 argc count of entries in argv
1492 argv argument strings, with argv[0] being the program name
1494 Returns: EXIT_SUCCESS if terminated successfully
1495 EXIT_FAILURE otherwise, except when a message has been sent
1496 to the sender, and -oee was given
1500 main(int argc, char **cargv)
1502 uschar **argv = USS cargv;
1503 int arg_receive_timeout = -1;
1504 int arg_smtp_receive_timeout = -1;
1505 int arg_error_handling = error_handling;
1506 int filter_sfd = -1;
1507 int filter_ufd = -1;
1510 int list_queue_option = 0;
1512 int msg_action_arg = -1;
1513 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1514 int queue_only_reason = 0;
1516 int perl_start_option = 0;
1518 int recipients_arg = argc;
1519 int sender_address_domain = 0;
1520 int test_retry_arg = -1;
1521 int test_rewrite_arg = -1;
1522 gid_t original_egid;
1523 BOOL arg_queue_only = FALSE;
1524 BOOL bi_option = FALSE;
1525 BOOL checking = FALSE;
1526 BOOL count_queue = FALSE;
1527 BOOL expansion_test = FALSE;
1528 BOOL extract_recipients = FALSE;
1529 BOOL flag_G = FALSE;
1530 BOOL flag_n = FALSE;
1531 BOOL forced_delivery = FALSE;
1532 BOOL f_end_dot = FALSE;
1533 BOOL deliver_give_up = FALSE;
1534 BOOL list_queue = FALSE;
1535 BOOL list_options = FALSE;
1536 BOOL list_config = FALSE;
1537 BOOL local_queue_only;
1539 BOOL one_msg_action = FALSE;
1540 BOOL opt_D_used = FALSE;
1541 BOOL queue_only_set = FALSE;
1542 BOOL receiving_message = TRUE;
1543 BOOL sender_ident_set = FALSE;
1544 BOOL session_local_queue_only;
1546 BOOL removed_privilege = FALSE;
1547 BOOL usage_wanted = FALSE;
1548 BOOL verify_address_mode = FALSE;
1549 BOOL verify_as_sender = FALSE;
1550 BOOL version_printed = FALSE;
1551 uschar *alias_arg = NULL;
1552 uschar *called_as = US"";
1553 uschar *cmdline_syslog_name = NULL;
1554 uschar *start_queue_run_id = NULL;
1555 uschar *stop_queue_run_id = NULL;
1556 uschar *expansion_test_message = NULL;
1557 uschar *ftest_domain = NULL;
1558 uschar *ftest_localpart = NULL;
1559 uschar *ftest_prefix = NULL;
1560 uschar *ftest_suffix = NULL;
1561 uschar *log_oneline = NULL;
1562 uschar *malware_test_file = NULL;
1563 uschar *real_sender_address;
1564 uschar *originator_home = US"/";
1569 struct stat statbuf;
1570 pid_t passed_qr_pid = (pid_t)0;
1571 int passed_qr_pipe = -1;
1572 gid_t group_list[EXIM_GROUPLIST_SIZE];
1574 /* For the -bI: flag */
1575 enum commandline_info info_flag = CMDINFO_NONE;
1576 BOOL info_stdout = FALSE;
1578 /* Possible options for -R and -S */
1580 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1582 /* Need to define this in case we need to change the environment in order
1583 to get rid of a bogus time zone. We have to make it char rather than uschar
1584 because some OS define it in /usr/include/unistd.h. */
1586 extern char **environ;
1588 /* If the Exim user and/or group and/or the configuration file owner/group were
1589 defined by ref:name at build time, we must now find the actual uid/gid values.
1590 This is a feature to make the lives of binary distributors easier. */
1592 #ifdef EXIM_USERNAME
1593 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1596 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1598 /* If ref:name uses a number as the name, route_finduser() returns
1599 TRUE with exim_uid set and pw coerced to NULL. */
1601 exim_gid = pw->pw_gid;
1602 #ifndef EXIM_GROUPNAME
1605 "exim: ref:name should specify a usercode, not a group.\n"
1606 "exim: can't let you get away with it unless you also specify a group.\n");
1610 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1613 #ifdef EXIM_GROUPNAME
1614 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1615 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1618 #ifdef CONFIGURE_OWNERNAME
1619 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1620 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1621 CONFIGURE_OWNERNAME);
1624 /* We default the system_filter_user to be the Exim run-time user, as a
1625 sane non-root value. */
1626 system_filter_uid = exim_uid;
1628 #ifdef CONFIGURE_GROUPNAME
1629 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1630 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1631 CONFIGURE_GROUPNAME);
1634 /* In the Cygwin environment, some initialization used to need doing.
1635 It was fudged in by means of this macro; now no longer but we'll leave
1636 it in case of others. */
1642 /* Check a field which is patched when we are running Exim within its
1643 testing harness; do a fast initial check, and then the whole thing. */
1645 f.running_in_test_harness =
1646 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1647 if (f.running_in_test_harness)
1650 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1651 at the start of a program; however, it seems that some environments do not
1652 follow this. A "strange" locale can affect the formatting of timestamps, so we
1655 setlocale(LC_ALL, "C");
1657 /* Set up the default handler for timing using alarm(). */
1659 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1661 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1662 because store_malloc writes a log entry on failure. */
1664 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1665 exim_fail("exim: failed to get store for log buffer\n");
1667 /* Initialize the default log options. */
1669 bits_set(log_selector, log_selector_size, log_default);
1671 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1672 NULL when the daemon is run and the file is closed. We have to use this
1673 indirection, because some systems don't allow writing to the variable "stderr".
1676 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1678 /* Arrange for the PCRE regex library to use our store functions. Note that
1679 the normal calls are actually macros that add additional arguments for
1680 debugging purposes so we have to assign specially constructed functions here.
1681 The default is to use store in the stacking pool, but this is overridden in the
1682 regex_must_compile() function. */
1684 pcre_malloc = function_store_get;
1685 pcre_free = function_dummy_free;
1687 /* Ensure there is a big buffer for temporary use in several places. It is put
1688 in malloc store so that it can be freed for enlargement if necessary. */
1690 big_buffer = store_malloc(big_buffer_size);
1692 /* Set up the handler for the data request signal, and set the initial
1693 descriptive text. */
1695 set_process_info("initializing");
1696 os_restarting_signal(SIGUSR1, usr1_handler);
1698 /* If running in a dockerized environment, the TERM signal is only
1699 delegated to the PID 1 if we request it by setting an signal handler */
1700 if (getpid() == 1) signal(SIGTERM, term_handler);
1702 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1703 in the daemon code. For the rest of Exim's uses, we ignore it. */
1705 signal(SIGHUP, SIG_IGN);
1707 /* We don't want to die on pipe errors as the code is written to handle
1708 the write error instead. */
1710 signal(SIGPIPE, SIG_IGN);
1712 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1713 set to SIG_IGN. This causes subprocesses that complete before the parent
1714 process waits for them not to hang around, so when Exim calls wait(), nothing
1715 is there. The wait() code has been made robust against this, but let's ensure
1716 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1717 ending status. We use sigaction rather than plain signal() on those OS where
1718 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1719 problem on AIX with this.) */
1723 struct sigaction act;
1724 act.sa_handler = SIG_DFL;
1725 sigemptyset(&(act.sa_mask));
1727 sigaction(SIGCHLD, &act, NULL);
1730 signal(SIGCHLD, SIG_DFL);
1733 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1738 /* Set up the version number. Set up the leading 'E' for the external form of
1739 message ids, set the pointer to the internal form, and initialize it to
1740 indicate no message being processed. */
1743 message_id_option[0] = '-';
1744 message_id_external = message_id_option + 1;
1745 message_id_external[0] = 'E';
1746 message_id = message_id_external + 1;
1749 /* Set the umask to zero so that any files Exim creates using open() are
1750 created with the modes that it specifies. NOTE: Files created with fopen() have
1751 a problem, which was not recognized till rather late (February 2006). With this
1752 umask, such files will be world writeable. (They are all content scanning files
1753 in the spool directory, which isn't world-accessible, so this is not a
1754 disaster, but it's untidy.) I don't want to change this overall setting,
1755 however, because it will interact badly with the open() calls. Instead, there's
1756 now a function called modefopen() that fiddles with the umask while calling
1761 /* Precompile the regular expression for matching a message id. Keep this in
1762 step with the code that generates ids in the accept.c module. We need to do
1763 this here, because the -M options check their arguments for syntactic validity
1764 using mac_ismsgid, which uses this. */
1767 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1769 /* Precompile the regular expression that is used for matching an SMTP error
1770 code, possibly extended, at the start of an error message. Note that the
1771 terminating whitespace character is included. */
1774 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1777 #ifdef WHITELIST_D_MACROS
1778 /* Precompile the regular expression used to filter the content of macros
1779 given to -D for permissibility. */
1781 regex_whitelisted_macro =
1782 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1785 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1787 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1788 this seems to be a generally accepted convention, since one finds symbolic
1789 links called "mailq" in standard OS configurations. */
1791 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1792 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1795 receiving_message = FALSE;
1796 called_as = US"-mailq";
1799 /* If the program is called as "rmail" treat it as equivalent to
1800 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1801 i.e. preventing a single dot on a line from terminating the message, and
1802 returning with zero return code, even in cases of error (provided an error
1803 message has been sent). */
1805 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1806 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1809 called_as = US"-rmail";
1810 errors_sender_rc = EXIT_SUCCESS;
1813 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1814 this is a smail convention. */
1816 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1817 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1819 smtp_input = smtp_batched_input = TRUE;
1820 called_as = US"-rsmtp";
1823 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1824 this is a smail convention. */
1826 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1827 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1830 receiving_message = FALSE;
1831 called_as = US"-runq";
1834 /* If the program is called as "newaliases" treat it as equivalent to
1835 "exim -bi"; this is a sendmail convention. */
1837 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1838 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1841 receiving_message = FALSE;
1842 called_as = US"-newaliases";
1845 /* Save the original effective uid for a couple of uses later. It should
1846 normally be root, but in some esoteric environments it may not be. */
1848 original_euid = geteuid();
1849 original_egid = getegid();
1851 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1852 to be the same as the real ones. This makes a difference only if Exim is setuid
1853 (or setgid) to something other than root, which could be the case in some
1854 special configurations. */
1856 real_uid = getuid();
1857 real_gid = getgid();
1859 if (real_uid == root_uid)
1861 if ((rv = setgid(real_gid)))
1862 exim_fail("exim: setgid(%ld) failed: %s\n",
1863 (long int)real_gid, strerror(errno));
1864 if ((rv = setuid(real_uid)))
1865 exim_fail("exim: setuid(%ld) failed: %s\n",
1866 (long int)real_uid, strerror(errno));
1869 /* If neither the original real uid nor the original euid was root, Exim is
1870 running in an unprivileged state. */
1872 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1874 /* Scan the program's arguments. Some can be dealt with right away; others are
1875 simply recorded for checking and handling afterwards. Do a high-level switch
1876 on the second character (the one after '-'), to save some effort. */
1878 for (i = 1; i < argc; i++)
1880 BOOL badarg = FALSE;
1881 uschar *arg = argv[i];
1885 /* An argument not starting with '-' is the start of a recipients list;
1886 break out of the options-scanning loop. */
1894 /* An option consisting of -- terminates the options */
1896 if (Ustrcmp(arg, "--") == 0)
1898 recipients_arg = i + 1;
1902 /* Handle flagged options */
1904 switchchar = arg[1];
1907 /* Make all -ex options synonymous with -oex arguments, since that
1908 is assumed by various callers. Also make -qR options synonymous with -R
1909 options, as that seems to be required as well. Allow for -qqR too, and
1910 the same for -S options. */
1912 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1913 Ustrncmp(arg+1, "qR", 2) == 0 ||
1914 Ustrncmp(arg+1, "qS", 2) == 0)
1916 switchchar = arg[2];
1919 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1921 switchchar = arg[3];
1923 f.queue_2stage = TRUE;
1926 /* Make -r synonymous with -f, since it is a documented alias */
1928 else if (arg[1] == 'r') switchchar = 'f';
1930 /* Make -ov synonymous with -v */
1932 else if (Ustrcmp(arg, "-ov") == 0)
1938 /* deal with --option_aliases */
1939 else if (switchchar == '-')
1941 if (Ustrcmp(argrest, "help") == 0)
1943 usage_wanted = TRUE;
1946 else if (Ustrcmp(argrest, "version") == 0)
1953 /* High-level switch on active initial letter */
1958 /* sendmail uses -Ac and -Am to control which .cf file is used;
1961 if (*argrest == '\0') { badarg = TRUE; break; }
1964 BOOL ignore = FALSE;
1969 if (*(argrest + 1) == '\0')
1973 if (!ignore) { badarg = TRUE; break; }
1977 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1978 so has no need of it. */
1981 if (*argrest == 0) i++; /* Skip over the type */
1986 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1988 /* -bd: Run in daemon mode, awaiting SMTP connections.
1989 -bdf: Ditto, but in the foreground.
1992 if (*argrest == 'd')
1994 f.daemon_listen = TRUE;
1995 if (*(++argrest) == 'f') f.background_daemon = FALSE;
1996 else if (*argrest != 0) { badarg = TRUE; break; }
1999 /* -be: Run in expansion test mode
2000 -bem: Ditto, but read a message from a file first
2003 else if (*argrest == 'e')
2005 expansion_test = checking = TRUE;
2006 if (argrest[1] == 'm')
2008 if (++i >= argc) { badarg = TRUE; break; }
2009 expansion_test_message = argv[i];
2012 if (argrest[1] != 0) { badarg = TRUE; break; }
2015 /* -bF: Run system filter test */
2017 else if (*argrest == 'F')
2019 filter_test |= checking = FTEST_SYSTEM;
2020 if (*(++argrest) != 0) { badarg = TRUE; break; }
2021 if (++i < argc) filter_test_sfile = argv[i]; else
2022 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2025 /* -bf: Run user filter test
2026 -bfd: Set domain for filter testing
2027 -bfl: Set local part for filter testing
2028 -bfp: Set prefix for filter testing
2029 -bfs: Set suffix for filter testing
2032 else if (*argrest == 'f')
2034 if (*(++argrest) == 0)
2036 filter_test |= checking = FTEST_USER;
2037 if (++i < argc) filter_test_ufile = argv[i]; else
2038 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2043 exim_fail("exim: string expected after %s\n", arg);
2044 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2045 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2046 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2047 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2048 else { badarg = TRUE; break; }
2052 /* -bh: Host checking - an IP address must follow. */
2054 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2056 if (++i >= argc) { badarg = TRUE; break; }
2057 sender_host_address = argv[i];
2058 host_checking = checking = f.log_testing_mode = TRUE;
2059 f.host_checking_callout = argrest[1] == 'c';
2060 message_logs = FALSE;
2063 /* -bi: This option is used by sendmail to initialize *the* alias file,
2064 though it has the -oA option to specify a different file. Exim has no
2065 concept of *the* alias file, but since Sun's YP make script calls
2066 sendmail this way, some support must be provided. */
2068 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2070 /* -bI: provide information, of the type to follow after a colon.
2071 This is an Exim flag. */
2073 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2075 uschar *p = &argrest[2];
2076 info_flag = CMDINFO_HELP;
2079 if (strcmpic(p, CUS"sieve") == 0)
2081 info_flag = CMDINFO_SIEVE;
2084 else if (strcmpic(p, CUS"dscp") == 0)
2086 info_flag = CMDINFO_DSCP;
2089 else if (strcmpic(p, CUS"help") == 0)
2096 /* -bm: Accept and deliver message - the default option. Reinstate
2097 receiving_message, which got turned off for all -b options. */
2099 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2101 /* -bmalware: test the filename given for malware */
2103 else if (Ustrcmp(argrest, "malware") == 0)
2105 if (++i >= argc) { badarg = TRUE; break; }
2107 malware_test_file = argv[i];
2110 /* -bnq: For locally originating messages, do not qualify unqualified
2111 addresses. In the envelope, this causes errors; in header lines they
2114 else if (Ustrcmp(argrest, "nq") == 0)
2116 f.allow_unqualified_sender = FALSE;
2117 f.allow_unqualified_recipient = FALSE;
2120 /* -bpxx: List the contents of the mail queue, in various forms. If
2121 the option is -bpc, just a queue count is needed. Otherwise, if the
2122 first letter after p is r, then order is random. */
2124 else if (*argrest == 'p')
2126 if (*(++argrest) == 'c')
2129 if (*(++argrest) != 0) badarg = TRUE;
2133 if (*argrest == 'r')
2135 list_queue_option = 8;
2138 else list_queue_option = 0;
2142 /* -bp: List the contents of the mail queue, top-level only */
2144 if (*argrest == 0) {}
2146 /* -bpu: List the contents of the mail queue, top-level undelivered */
2148 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2150 /* -bpa: List the contents of the mail queue, including all delivered */
2152 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2154 /* Unknown after -bp[r] */
2164 /* -bP: List the configuration variables given as the address list.
2165 Force -v, so configuration errors get displayed. */
2167 else if (Ustrcmp(argrest, "P") == 0)
2169 /* -bP config: we need to setup here, because later,
2170 * when list_options is checked, the config is read already */
2171 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2174 readconf_save_config(version_string);
2178 list_options = TRUE;
2179 debug_selector |= D_v;
2180 debug_file = stderr;
2184 /* -brt: Test retry configuration lookup */
2186 else if (Ustrcmp(argrest, "rt") == 0)
2189 test_retry_arg = i + 1;
2193 /* -brw: Test rewrite configuration */
2195 else if (Ustrcmp(argrest, "rw") == 0)
2198 test_rewrite_arg = i + 1;
2202 /* -bS: Read SMTP commands on standard input, but produce no replies -
2203 all errors are reported by sending messages. */
2205 else if (Ustrcmp(argrest, "S") == 0)
2206 smtp_input = smtp_batched_input = receiving_message = TRUE;
2208 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2209 on standard output. */
2211 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2213 /* -bt: address testing mode */
2215 else if (Ustrcmp(argrest, "t") == 0)
2216 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2218 /* -bv: verify addresses */
2220 else if (Ustrcmp(argrest, "v") == 0)
2221 verify_address_mode = checking = f.log_testing_mode = TRUE;
2223 /* -bvs: verify sender addresses */
2225 else if (Ustrcmp(argrest, "vs") == 0)
2227 verify_address_mode = checking = f.log_testing_mode = TRUE;
2228 verify_as_sender = TRUE;
2231 /* -bV: Print version string and support details */
2233 else if (Ustrcmp(argrest, "V") == 0)
2235 printf("Exim version %s #%s built %s\n", version_string,
2236 version_cnumber, version_date);
2237 printf("%s\n", CS version_copyright);
2238 version_printed = TRUE;
2239 show_whats_supported(stdout);
2240 f.log_testing_mode = TRUE;
2243 /* -bw: inetd wait mode, accept a listening socket as stdin */
2245 else if (*argrest == 'w')
2247 f.inetd_wait_mode = TRUE;
2248 f.background_daemon = FALSE;
2249 f.daemon_listen = TRUE;
2250 if (*(++argrest) != '\0')
2251 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2252 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2259 /* -C: change configuration file list; ignore if it isn't really
2260 a change! Enforce a prefix check if required. */
2265 if(++i < argc) argrest = argv[i]; else
2266 { badarg = TRUE; break; }
2268 if (Ustrcmp(config_main_filelist, argrest) != 0)
2270 #ifdef ALT_CONFIG_PREFIX
2272 int len = Ustrlen(ALT_CONFIG_PREFIX);
2273 const uschar *list = argrest;
2275 while((filename = string_nextinlist(&list, &sep, big_buffer,
2276 big_buffer_size)) != NULL)
2278 if ((Ustrlen(filename) < len ||
2279 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2280 Ustrstr(filename, "/../") != NULL) &&
2281 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2282 exim_fail("-C Permission denied\n");
2285 if (real_uid != root_uid)
2287 #ifdef TRUSTED_CONFIG_LIST
2289 if (real_uid != exim_uid
2290 #ifdef CONFIGURE_OWNER
2291 && real_uid != config_uid
2294 f.trusted_config = FALSE;
2297 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2300 struct stat statbuf;
2302 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2303 (statbuf.st_uid != root_uid /* owner not root */
2304 #ifdef CONFIGURE_OWNER
2305 && statbuf.st_uid != config_uid /* owner not the special one */
2308 (statbuf.st_gid != root_gid /* group not root */
2309 #ifdef CONFIGURE_GROUP
2310 && statbuf.st_gid != config_gid /* group not the special one */
2312 && (statbuf.st_mode & 020) != 0 /* group writeable */
2314 (statbuf.st_mode & 2) != 0) /* world writeable */
2316 f.trusted_config = FALSE;
2321 /* Well, the trust list at least is up to scratch... */
2322 void *reset_point = store_get(0);
2323 uschar *trusted_configs[32];
2327 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2329 uschar *start = big_buffer, *nl;
2330 while (*start && isspace(*start))
2334 nl = Ustrchr(start, '\n');
2337 trusted_configs[nr_configs++] = string_copy(start);
2338 if (nr_configs == 32)
2346 const uschar *list = argrest;
2348 while (f.trusted_config && (filename = string_nextinlist(&list,
2349 &sep, big_buffer, big_buffer_size)) != NULL)
2351 for (i=0; i < nr_configs; i++)
2353 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2356 if (i == nr_configs)
2358 f.trusted_config = FALSE;
2362 store_reset(reset_point);
2366 /* No valid prefixes found in trust_list file. */
2367 f.trusted_config = FALSE;
2373 /* Could not open trust_list file. */
2374 f.trusted_config = FALSE;
2378 /* Not root; don't trust config */
2379 f.trusted_config = FALSE;
2383 config_main_filelist = argrest;
2384 f.config_changed = TRUE;
2389 /* -D: set up a macro definition */
2392 #ifdef DISABLE_D_OPTION
2393 exim_fail("exim: -D is not available in this Exim binary\n");
2399 uschar *s = argrest;
2402 while (isspace(*s)) s++;
2404 if (*s < 'A' || *s > 'Z')
2405 exim_fail("exim: macro name set by -D must start with "
2406 "an upper case letter\n");
2408 while (isalnum(*s) || *s == '_')
2410 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2414 if (ptr == 0) { badarg = TRUE; break; }
2415 while (isspace(*s)) s++;
2418 if (*s++ != '=') { badarg = TRUE; break; }
2419 while (isspace(*s)) s++;
2422 for (m = macros_user; m; m = m->next)
2423 if (Ustrcmp(m->name, name) == 0)
2424 exim_fail("exim: duplicated -D in command line\n");
2426 m = macro_create(name, s, TRUE);
2428 if (clmacro_count >= MAX_CLMACROS)
2429 exim_fail("exim: too many -D options on command line\n");
2430 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2436 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2437 The latter is now a no-op, retained for compatibility only. If -dd is used,
2438 debugging subprocesses of the daemon is disabled. */
2441 if (Ustrcmp(argrest, "ropcr") == 0)
2443 /* drop_cr = TRUE; */
2446 /* Use an intermediate variable so that we don't set debugging while
2447 decoding the debugging bits. */
2451 unsigned int selector = D_default;
2454 if (*argrest == 'd')
2456 f.debug_daemon = TRUE;
2460 decode_bits(&selector, 1, debug_notall, argrest,
2461 debug_options, debug_options_count, US"debug", 0);
2462 debug_selector = selector;
2467 /* -E: This is a local error message. This option is not intended for
2468 external use at all, but is not restricted to trusted callers because it
2469 does no harm (just suppresses certain error messages) and if Exim is run
2470 not setuid root it won't always be trusted when it generates error
2471 messages using this option. If there is a message id following -E, point
2472 message_reference at it, for logging. */
2475 f.local_error_message = TRUE;
2476 if (mac_ismsgid(argrest)) message_reference = argrest;
2480 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2481 option, so it looks as if historically the -oex options are also callable
2482 without the leading -o. So we have to accept them. Before the switch,
2483 anything starting -oe has been converted to -e. Exim does not support all
2484 of the sendmail error options. */
2487 if (Ustrcmp(argrest, "e") == 0)
2489 arg_error_handling = ERRORS_SENDER;
2490 errors_sender_rc = EXIT_SUCCESS;
2492 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2493 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2494 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2495 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2500 /* -F: Set sender's full name, used instead of the gecos entry from
2501 the password file. Since users can usually alter their gecos entries,
2502 there's no security involved in using this instead. The data can follow
2503 the -F or be in the next argument. */
2508 if(++i < argc) argrest = argv[i]; else
2509 { badarg = TRUE; break; }
2511 originator_name = argrest;
2512 f.sender_name_forced = TRUE;
2516 /* -f: Set sender's address - this value is only actually used if Exim is
2517 run by a trusted user, or if untrusted_set_sender is set and matches the
2518 address, except that the null address can always be set by any user. The
2519 test for this happens later, when the value given here is ignored when not
2520 permitted. For an untrusted user, the actual sender is still put in Sender:
2521 if it doesn't match the From: header (unless no_local_from_check is set).
2522 The data can follow the -f or be in the next argument. The -r switch is an
2523 obsolete form of -f but since there appear to be programs out there that
2524 use anything that sendmail has ever supported, better accept it - the
2525 synonymizing is done before the switch above.
2527 At this stage, we must allow domain literal addresses, because we don't
2528 know what the setting of allow_domain_literals is yet. Ditto for trailing
2529 dots and strip_trailing_dot. */
2533 int dummy_start, dummy_end;
2537 if (i+1 < argc) argrest = argv[++i]; else
2538 { badarg = TRUE; break; }
2541 sender_address = string_sprintf(""); /* Ensure writeable memory */
2544 uschar *temp = argrest + Ustrlen(argrest) - 1;
2545 while (temp >= argrest && isspace(*temp)) temp--;
2546 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2547 allow_domain_literals = TRUE;
2548 strip_trailing_dot = TRUE;
2550 allow_utf8_domains = TRUE;
2552 sender_address = parse_extract_address(argrest, &errmess,
2553 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2555 message_smtputf8 = string_is_utf8(sender_address);
2556 allow_utf8_domains = FALSE;
2558 allow_domain_literals = FALSE;
2559 strip_trailing_dot = FALSE;
2560 if (!sender_address)
2561 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2563 f.sender_address_forced = TRUE;
2567 /* -G: sendmail invocation to specify that it's a gateway submission and
2568 sendmail may complain about problems instead of fixing them.
2569 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2570 not at this time complain about problems. */
2576 /* -h: Set the hop count for an incoming message. Exim does not currently
2577 support this; it always computes it by counting the Received: headers.
2578 To put it in will require a change to the spool header file format. */
2583 if(++i < argc) argrest = argv[i]; else
2584 { badarg = TRUE; break; }
2586 if (!isdigit(*argrest)) badarg = TRUE;
2590 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2591 not to be documented for sendmail but mailx (at least) uses it) */
2594 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2598 /* -L: set the identifier used for syslog; equivalent to setting
2599 syslog_processname in the config file, but needs to be an admin option. */
2602 if (*argrest == '\0')
2604 if(++i < argc) argrest = argv[i]; else
2605 { badarg = TRUE; break; }
2607 if ((sz = Ustrlen(argrest)) > 32)
2608 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2610 exim_fail("exim: the -L syslog name is too short\n");
2611 cmdline_syslog_name = argrest;
2615 receiving_message = FALSE;
2617 /* -MC: continue delivery of another message via an existing open
2618 file descriptor. This option is used for an internal call by the
2619 smtp transport when there is a pending message waiting to go to an
2620 address to which it has got a connection. Five subsequent arguments are
2621 required: transport name, host name, IP address, sequence number, and
2622 message_id. Transports may decline to create new processes if the sequence
2623 number gets too big. The channel is stdin. This (-MC) must be the last
2624 argument. There's a subsequent check that the real-uid is privileged.
2626 If we are running in the test harness. delay for a bit, to let the process
2627 that set this one up complete. This makes for repeatability of the logging,
2630 if (Ustrcmp(argrest, "C") == 0)
2632 union sockaddr_46 interface_sock;
2633 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2636 exim_fail("exim: too many or too few arguments after -MC\n");
2638 if (msg_action_arg >= 0)
2639 exim_fail("exim: incompatible arguments\n");
2641 continue_transport = argv[++i];
2642 continue_hostname = argv[++i];
2643 continue_host_address = argv[++i];
2644 continue_sequence = Uatoi(argv[++i]);
2645 msg_action = MSG_DELIVER;
2646 msg_action_arg = ++i;
2647 forced_delivery = TRUE;
2648 queue_run_pid = passed_qr_pid;
2649 queue_run_pipe = passed_qr_pipe;
2651 if (!mac_ismsgid(argv[i]))
2652 exim_fail("exim: malformed message id %s after -MC option\n",
2655 /* Set up $sending_ip_address and $sending_port, unless proxied */
2657 if (!continue_proxy_cipher)
2658 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2660 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2663 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2666 if (f.running_in_test_harness) millisleep(500);
2670 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2674 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2675 precedes -MC (see above). The flag indicates that the host to which
2676 Exim is connected has accepted an AUTH sequence. */
2678 case 'A': f.smtp_authenticated = TRUE; break;
2680 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2681 that exim is connected to supports the esmtp extension DSN */
2683 case 'D': smtp_peer_options |= OPTION_DSN; break;
2685 /* -MCG: set the queue name, to a non-default value */
2687 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2691 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2693 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2695 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2696 it preceded -MC (see above) */
2698 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2700 /* -MCQ: pass on the pid of the queue-running process that started
2701 this chain of deliveries and the fd of its synchronizing pipe; this
2702 is useful only when it precedes -MC (see above) */
2704 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2706 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2710 /* -MCS: set the smtp_use_size flag; this is useful only when it
2711 precedes -MC (see above) */
2713 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2716 /* -MCt: similar to -MCT below but the connection is still open
2717 via a proxy process which handles the TLS context and coding.
2718 Require three arguments for the proxied local address and port,
2719 and the TLS cipher. */
2721 case 't': if (++i < argc) sending_ip_address = argv[i];
2723 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2725 if (++i < argc) continue_proxy_cipher = argv[i];
2729 /* -MCT: set the tls_offered flag; this is useful only when it
2730 precedes -MC (see above). The flag indicates that the host to which
2731 Exim is connected has offered TLS support. */
2733 case 'T': smtp_peer_options |= OPTION_TLS; break;
2736 default: badarg = TRUE; break;
2741 /* -M[x]: various operations on the following list of message ids:
2742 -M deliver the messages, ignoring next retry times and thawing
2743 -Mc deliver the messages, checking next retry times, no thawing
2744 -Mf freeze the messages
2745 -Mg give up on the messages
2746 -Mt thaw the messages
2747 -Mrm remove the messages
2748 In the above cases, this must be the last option. There are also the
2749 following options which are followed by a single message id, and which
2750 act on that message. Some of them use the "recipient" addresses as well.
2751 -Mar add recipient(s)
2752 -Mmad mark all recipients delivered
2753 -Mmd mark recipients(s) delivered
2755 -Mset load a message for use with -be
2757 -Mvc show copy (of whole message, in RFC 2822 format)
2762 else if (*argrest == 0)
2764 msg_action = MSG_DELIVER;
2765 forced_delivery = f.deliver_force_thaw = TRUE;
2767 else if (Ustrcmp(argrest, "ar") == 0)
2769 msg_action = MSG_ADD_RECIPIENT;
2770 one_msg_action = TRUE;
2772 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2773 else if (Ustrcmp(argrest, "es") == 0)
2775 msg_action = MSG_EDIT_SENDER;
2776 one_msg_action = TRUE;
2778 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2779 else if (Ustrcmp(argrest, "g") == 0)
2781 msg_action = MSG_DELIVER;
2782 deliver_give_up = TRUE;
2784 else if (Ustrcmp(argrest, "mad") == 0)
2786 msg_action = MSG_MARK_ALL_DELIVERED;
2788 else if (Ustrcmp(argrest, "md") == 0)
2790 msg_action = MSG_MARK_DELIVERED;
2791 one_msg_action = TRUE;
2793 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2794 else if (Ustrcmp(argrest, "set") == 0)
2796 msg_action = MSG_LOAD;
2797 one_msg_action = TRUE;
2799 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2800 else if (Ustrcmp(argrest, "vb") == 0)
2802 msg_action = MSG_SHOW_BODY;
2803 one_msg_action = TRUE;
2805 else if (Ustrcmp(argrest, "vc") == 0)
2807 msg_action = MSG_SHOW_COPY;
2808 one_msg_action = TRUE;
2810 else if (Ustrcmp(argrest, "vh") == 0)
2812 msg_action = MSG_SHOW_HEADER;
2813 one_msg_action = TRUE;
2815 else if (Ustrcmp(argrest, "vl") == 0)
2817 msg_action = MSG_SHOW_LOG;
2818 one_msg_action = TRUE;
2820 else { badarg = TRUE; break; }
2822 /* All the -Mxx options require at least one message id. */
2824 msg_action_arg = i + 1;
2825 if (msg_action_arg >= argc)
2826 exim_fail("exim: no message ids given after %s option\n", arg);
2828 /* Some require only message ids to follow */
2830 if (!one_msg_action)
2832 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2833 exim_fail("exim: malformed message id %s after %s option\n",
2835 goto END_ARG; /* Remaining args are ids */
2838 /* Others require only one message id, possibly followed by addresses,
2839 which will be handled as normal arguments. */
2843 if (!mac_ismsgid(argv[msg_action_arg]))
2844 exim_fail("exim: malformed message id %s after %s option\n",
2845 argv[msg_action_arg], arg);
2851 /* Some programs seem to call the -om option without the leading o;
2852 for sendmail it askes for "me too". Exim always does this. */
2855 if (*argrest != 0) badarg = TRUE;
2859 /* -N: don't do delivery - a debugging option that stops transports doing
2860 their thing. It implies debugging at the D_v level. */
2865 f.dont_deliver = TRUE;
2866 debug_selector |= D_v;
2867 debug_file = stderr;
2873 /* -n: This means "don't alias" in sendmail, apparently.
2874 For normal invocations, it has no effect.
2875 It may affect some other options. */
2881 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2882 option to the specified value. This form uses long names. We need to handle
2883 -O option=value and -Ooption=value. */
2889 exim_fail("exim: string expected after -O\n");
2895 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2898 if (*argrest == 'A')
2900 alias_arg = argrest + 1;
2901 if (alias_arg[0] == 0)
2903 if (i+1 < argc) alias_arg = argv[++i]; else
2904 exim_fail("exim: string expected after -oA\n");
2908 /* -oB: Set a connection message max value for remote deliveries */
2910 else if (*argrest == 'B')
2912 uschar *p = argrest + 1;
2915 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2917 connection_max_messages = 1;
2925 exim_fail("exim: number expected after -oB\n");
2926 connection_max_messages = Uatoi(p);
2930 /* -odb: background delivery */
2932 else if (Ustrcmp(argrest, "db") == 0)
2934 f.synchronous_delivery = FALSE;
2935 arg_queue_only = FALSE;
2936 queue_only_set = TRUE;
2939 /* -odf: foreground delivery (smail-compatible option); same effect as
2940 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2943 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2945 f.synchronous_delivery = TRUE;
2946 arg_queue_only = FALSE;
2947 queue_only_set = TRUE;
2950 /* -odq: queue only */
2952 else if (Ustrcmp(argrest, "dq") == 0)
2954 f.synchronous_delivery = FALSE;
2955 arg_queue_only = TRUE;
2956 queue_only_set = TRUE;
2959 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2960 but no remote delivery */
2962 else if (Ustrcmp(argrest, "dqs") == 0)
2964 f.queue_smtp = TRUE;
2965 arg_queue_only = FALSE;
2966 queue_only_set = TRUE;
2969 /* -oex: Sendmail error flags. As these are also accepted without the
2970 leading -o prefix, for compatibility with vacation and other callers,
2971 they are handled with -e above. */
2973 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2974 -oitrue: Another sendmail syntax for the same */
2976 else if (Ustrcmp(argrest, "i") == 0 ||
2977 Ustrcmp(argrest, "itrue") == 0)
2980 /* -oM*: Set various characteristics for an incoming message; actually
2981 acted on for trusted callers only. */
2983 else if (*argrest == 'M')
2986 exim_fail("exim: data expected after -o%s\n", argrest);
2988 /* -oMa: Set sender host address */
2990 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2992 /* -oMaa: Set authenticator name */
2994 else if (Ustrcmp(argrest, "Maa") == 0)
2995 sender_host_authenticated = argv[++i];
2997 /* -oMas: setting authenticated sender */
2999 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3001 /* -oMai: setting authenticated id */
3003 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3005 /* -oMi: Set incoming interface address */
3007 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3009 /* -oMm: Message reference */
3011 else if (Ustrcmp(argrest, "Mm") == 0)
3013 if (!mac_ismsgid(argv[i+1]))
3014 exim_fail("-oMm must be a valid message ID\n");
3015 if (!f.trusted_config)
3016 exim_fail("-oMm must be called by a trusted user/config\n");
3017 message_reference = argv[++i];
3020 /* -oMr: Received protocol */
3022 else if (Ustrcmp(argrest, "Mr") == 0)
3024 if (received_protocol)
3025 exim_fail("received_protocol is set already\n");
3027 received_protocol = argv[++i];
3029 /* -oMs: Set sender host name */
3031 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3033 /* -oMt: Set sender ident */
3035 else if (Ustrcmp(argrest, "Mt") == 0)
3037 sender_ident_set = TRUE;
3038 sender_ident = argv[++i];
3041 /* Else a bad argument */
3050 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3051 seem to call this as -m (undocumented), so that is also accepted (see
3054 else if (Ustrcmp(argrest, "m") == 0) {}
3056 /* -oo: An ancient flag for old-style addresses which still seems to
3057 crop up in some calls (see in SCO). */
3059 else if (Ustrcmp(argrest, "o") == 0) {}
3061 /* -oP <name>: set pid file path for daemon */
3063 else if (Ustrcmp(argrest, "P") == 0)
3064 override_pid_file_path = argv[++i];
3066 /* -or <n>: set timeout for non-SMTP acceptance
3067 -os <n>: set timeout for SMTP acceptance */
3069 else if (*argrest == 'r' || *argrest == 's')
3071 int *tp = (*argrest == 'r')?
3072 &arg_receive_timeout : &arg_smtp_receive_timeout;
3073 if (argrest[1] == 0)
3075 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3077 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3079 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3082 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3084 else if (Ustrcmp(argrest, "X") == 0)
3085 override_local_interfaces = argv[++i];
3087 /* Unknown -o argument */
3093 /* -ps: force Perl startup; -pd force delayed Perl startup */
3097 if (*argrest == 's' && argrest[1] == 0)
3099 perl_start_option = 1;
3102 if (*argrest == 'd' && argrest[1] == 0)
3104 perl_start_option = -1;
3109 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3110 which sets the host protocol and host name */
3114 argrest = argv[++i];
3116 { badarg = TRUE; break; }
3122 if (received_protocol)
3123 exim_fail("received_protocol is set already\n");
3125 hn = Ustrchr(argrest, ':');
3127 received_protocol = argrest;
3130 int old_pool = store_pool;
3131 store_pool = POOL_PERM;
3132 received_protocol = string_copyn(argrest, hn - argrest);
3133 store_pool = old_pool;
3134 sender_host_name = hn + 1;
3141 receiving_message = FALSE;
3142 if (queue_interval >= 0)
3143 exim_fail("exim: -q specified more than once\n");
3145 /* -qq...: Do queue runs in a 2-stage manner */
3147 if (*argrest == 'q')
3149 f.queue_2stage = TRUE;
3153 /* -qi...: Do only first (initial) deliveries */
3155 if (*argrest == 'i')
3157 f.queue_run_first_delivery = TRUE;
3161 /* -qf...: Run the queue, forcing deliveries
3162 -qff..: Ditto, forcing thawing as well */
3164 if (*argrest == 'f')
3166 f.queue_run_force = TRUE;
3167 if (*++argrest == 'f')
3169 f.deliver_force_thaw = TRUE;
3174 /* -q[f][f]l...: Run the queue only on local deliveries */
3176 if (*argrest == 'l')
3178 f.queue_run_local = TRUE;
3182 /* -q[f][f][l][G<name>]... Work on the named queue */
3184 if (*argrest == 'G')
3187 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3188 queue_name = string_copyn(argrest, i);
3190 if (*argrest == '/') argrest++;
3193 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3194 only, optionally named, optionally starting from a given message id. */
3196 if (!(list_queue || count_queue))
3198 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3201 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3202 start_queue_run_id = argv[++i];
3203 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3204 stop_queue_run_id = argv[++i];
3207 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3208 forced, optionally local only, optionally named. */
3210 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3212 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3216 case 'R': /* Synonymous with -qR... */
3217 receiving_message = FALSE;
3219 /* -Rf: As -R (below) but force all deliveries,
3220 -Rff: Ditto, but also thaw all frozen messages,
3221 -Rr: String is regex
3222 -Rrf: Regex and force
3223 -Rrff: Regex and force and thaw
3225 in all cases provided there are no further characters in this
3229 for (int i = 0; i < nelem(rsopts); i++)
3230 if (Ustrcmp(argrest, rsopts[i]) == 0)
3232 if (i != 2) f.queue_run_force = TRUE;
3233 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3234 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3235 argrest += Ustrlen(rsopts[i]);
3238 /* -R: Set string to match in addresses for forced queue run to
3239 pick out particular messages. */
3242 deliver_selectstring = argrest;
3243 else if (i+1 < argc)
3244 deliver_selectstring = argv[++i];
3246 exim_fail("exim: string expected after -R\n");
3250 /* -r: an obsolete synonym for -f (see above) */
3253 /* -S: Like -R but works on sender. */
3255 case 'S': /* Synonymous with -qS... */
3256 receiving_message = FALSE;
3258 /* -Sf: As -S (below) but force all deliveries,
3259 -Sff: Ditto, but also thaw all frozen messages,
3260 -Sr: String is regex
3261 -Srf: Regex and force
3262 -Srff: Regex and force and thaw
3264 in all cases provided there are no further characters in this
3268 for (int i = 0; i < nelem(rsopts); i++)
3269 if (Ustrcmp(argrest, rsopts[i]) == 0)
3271 if (i != 2) f.queue_run_force = TRUE;
3272 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3273 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3274 argrest += Ustrlen(rsopts[i]);
3277 /* -S: Set string to match in addresses for forced queue run to
3278 pick out particular messages. */
3281 deliver_selectstring_sender = argrest;
3282 else if (i+1 < argc)
3283 deliver_selectstring_sender = argv[++i];
3285 exim_fail("exim: string expected after -S\n");
3288 /* -Tqt is an option that is exclusively for use by the testing suite.
3289 It is not recognized in other circumstances. It allows for the setting up
3290 of explicit "queue times" so that various warning/retry things can be
3291 tested. Otherwise variability of clock ticks etc. cause problems. */
3294 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3295 fudged_queue_times = argv[++i];
3300 /* -t: Set flag to extract recipients from body of message. */
3303 if (*argrest == 0) extract_recipients = TRUE;
3305 /* -ti: Set flag to extract recipients from body of message, and also
3306 specify that dot does not end the message. */
3308 else if (Ustrcmp(argrest, "i") == 0)
3310 extract_recipients = TRUE;
3314 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3317 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3324 /* -U: This means "initial user submission" in sendmail, apparently. The
3325 doc claims that in future sendmail may refuse syntactically invalid
3326 messages instead of fixing them. For the moment, we just ignore it. */
3332 /* -v: verify things - this is a very low-level debugging */
3337 debug_selector |= D_v;
3338 debug_file = stderr;
3344 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3346 The -x flag tells the sendmail command that mail from a local
3347 mail program has National Language Support (NLS) extended characters
3348 in the body of the mail item. The sendmail command can send mail with
3349 extended NLS characters across networks that normally corrupts these
3352 As Exim is 8-bit clean, it just ignores this flag. */
3355 if (*argrest != 0) badarg = TRUE;
3358 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3359 logs to that file. We swallow the parameter and otherwise ignore it. */
3362 if (*argrest == '\0')
3364 exim_fail("exim: string expected after -X\n");
3368 if (*argrest == '\0')
3370 log_oneline = argv[i];
3372 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3375 /* All other initial characters are errors */
3380 } /* End of high-level switch statement */
3382 /* Failed to recognize the option, or syntax error */
3385 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3386 "option %s\n", arg);
3390 /* If -R or -S have been specified without -q, assume a single queue run. */
3392 if ( (deliver_selectstring || deliver_selectstring_sender)
3393 && queue_interval < 0)
3398 /* If usage_wanted is set we call the usage function - which never returns */
3399 if (usage_wanted) exim_usage(called_as);
3401 /* Arguments have been processed. Check for incompatibilities. */
3403 (smtp_input || extract_recipients || recipients_arg < argc) &&
3404 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3405 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3406 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3409 msg_action_arg > 0 &&
3410 (f.daemon_listen || queue_interval > 0 || list_options ||
3411 (checking && msg_action != MSG_LOAD) ||
3412 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3415 (f.daemon_listen || queue_interval > 0) &&
3416 (sender_address != NULL || list_options || list_queue || checking ||
3420 f.daemon_listen && queue_interval == 0
3423 f.inetd_wait_mode && queue_interval >= 0
3427 (checking || smtp_input || extract_recipients ||
3428 filter_test != FTEST_NONE || bi_option)
3431 verify_address_mode &&
3432 (f.address_test_mode || smtp_input || extract_recipients ||
3433 filter_test != FTEST_NONE || bi_option)
3436 f.address_test_mode && (smtp_input || extract_recipients ||
3437 filter_test != FTEST_NONE || bi_option)
3440 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3444 deliver_selectstring != NULL && queue_interval < 0
3447 msg_action == MSG_LOAD &&
3448 (!expansion_test || expansion_test_message != NULL)
3451 exim_fail("exim: incompatible command-line options or arguments\n");
3453 /* If debugging is set up, set the file and the file descriptor to pass on to
3454 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3455 to run in the foreground. */
3457 if (debug_selector != 0)
3459 debug_file = stderr;
3460 debug_fd = fileno(debug_file);
3461 f.background_daemon = FALSE;
3462 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3463 if (debug_selector != D_v) /* -v only doesn't show this */
3465 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3466 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3468 if (!version_printed)
3469 show_whats_supported(stderr);
3473 /* When started with root privilege, ensure that the limits on the number of
3474 open files and the number of processes (where that is accessible) are
3475 sufficiently large, or are unset, in case Exim has been called from an
3476 environment where the limits are screwed down. Not all OS have the ability to
3477 change some of these limits. */
3481 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3487 #ifdef RLIMIT_NOFILE
3488 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3490 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3492 rlp.rlim_cur = rlp.rlim_max = 0;
3495 /* I originally chose 1000 as a nice big number that was unlikely to
3496 be exceeded. It turns out that some older OS have a fixed upper limit of
3499 if (rlp.rlim_cur < 1000)
3501 rlp.rlim_cur = rlp.rlim_max = 1000;
3502 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3504 rlp.rlim_cur = rlp.rlim_max = 256;
3505 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3506 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3513 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3515 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3517 rlp.rlim_cur = rlp.rlim_max = 0;
3520 #ifdef RLIM_INFINITY
3521 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3523 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3525 if (rlp.rlim_cur < 1000)
3527 rlp.rlim_cur = rlp.rlim_max = 1000;
3529 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3530 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3536 /* Exim is normally entered as root (but some special configurations are
3537 possible that don't do this). However, it always spins off sub-processes that
3538 set their uid and gid as required for local delivery. We don't want to pass on
3539 any extra groups that root may belong to, so we want to get rid of them all at
3542 We need to obey setgroups() at this stage, before possibly giving up root
3543 privilege for a changed configuration file, but later on we might need to
3544 check on the additional groups for the admin user privilege - can't do that
3545 till after reading the config, which might specify the exim gid. Therefore,
3546 save the group list here first. */
3548 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3549 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3551 /* There is a fundamental difference in some BSD systems in the matter of
3552 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3553 known not to be different. On the "different" systems there is a single group
3554 list, and the first entry in it is the current group. On all other versions of
3555 Unix there is a supplementary group list, which is in *addition* to the current
3556 group. Consequently, to get rid of all extraneous groups on a "standard" system
3557 you pass over 0 groups to setgroups(), while on a "different" system you pass
3558 over a single group - the current group, which is always the first group in the
3559 list. Calling setgroups() with zero groups on a "different" system results in
3560 an error return. The following code should cope with both types of system.
3562 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3563 the "setgroups() with zero groups" - and changes the egid.
3564 Thanks to that we had to stash the original_egid above, for use below
3565 in the call to exim_setugid().
3567 However, if this process isn't running as root, setgroups() can't be used
3568 since you have to be root to run it, even if throwing away groups. Not being
3569 root here happens only in some unusual configurations. We just ignore the
3572 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3573 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3575 /* If the configuration file name has been altered by an argument on the
3576 command line (either a new file name or a macro definition) and the caller is
3577 not root, or if this is a filter testing run, remove any setuid privilege the
3578 program has and run as the underlying user.
3580 The exim user is locked out of this, which severely restricts the use of -C
3583 Otherwise, set the real ids to the effective values (should be root unless run
3584 from inetd, which it can either be root or the exim uid, if one is configured).
3586 There is a private mechanism for bypassing some of this, in order to make it
3587 possible to test lots of configurations automatically, without having either to
3588 recompile each time, or to patch in an actual configuration file name and other
3589 values (such as the path name). If running in the test harness, pretend that
3590 configuration file changes and macro definitions haven't happened. */
3593 (!f.trusted_config || /* Config changed, or */
3594 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3595 real_uid != root_uid && /* Not root, and */
3596 !f.running_in_test_harness /* Not fudged */
3598 expansion_test /* expansion testing */
3600 filter_test != FTEST_NONE) /* Filter testing */
3602 setgroups(group_count, group_list);
3603 exim_setugid(real_uid, real_gid, FALSE,
3604 US"-C, -D, -be or -bf forces real uid");
3605 removed_privilege = TRUE;
3607 /* In the normal case when Exim is called like this, stderr is available
3608 and should be used for any logging information because attempts to write
3609 to the log will usually fail. To arrange this, we unset really_exim. However,
3610 if no stderr is available there is no point - we might as well have a go
3611 at the log (if it fails, syslog will be written).
3613 Note that if the invoker is Exim, the logs remain available. Messing with
3614 this causes unlogged successful deliveries. */
3616 if (log_stderr && real_uid != exim_uid)
3617 f.really_exim = FALSE;
3620 /* Privilege is to be retained for the moment. It may be dropped later,
3621 depending on the job that this Exim process has been asked to do. For now, set
3622 the real uid to the effective so that subsequent re-execs of Exim are done by a
3626 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3628 /* If testing a filter, open the file(s) now, before wasting time doing other
3629 setups and reading the message. */
3631 if (filter_test & FTEST_SYSTEM)
3632 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3633 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3636 if (filter_test & FTEST_USER)
3637 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3638 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3641 /* Initialise lookup_list
3642 If debugging, already called above via version reporting.
3643 In either case, we initialise the list of available lookups while running
3644 as root. All dynamically modules are loaded from a directory which is
3645 hard-coded into the binary and is code which, if not a module, would be
3646 part of Exim already. Ability to modify the content of the directory
3647 is equivalent to the ability to modify a setuid binary!
3649 This needs to happen before we read the main configuration. */
3653 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3656 /* Read the main runtime configuration data; this gives up if there
3657 is a failure. It leaves the configuration file open so that the subsequent
3658 configuration data for delivery can be read if needed.
3660 NOTE: immediately after opening the configuration file we change the working
3661 directory to "/"! Later we change to $spool_directory. We do it there, because
3662 during readconf_main() some expansion takes place already. */
3664 /* Store the initial cwd before we change directories. Can be NULL if the
3665 dir has already been unlinked. */
3666 initial_cwd = os_getcwd(NULL, 0);
3669 -be[m] expansion test -
3670 -b[fF] filter test new
3672 -bmalware malware_test_file new
3674 -brw rewrite test new
3676 -bv[s] address verify -
3678 -bP <option> (except -bP config, which sets list_config)
3680 If any of these options is set, we suppress warnings about configuration
3681 issues (currently about tls_advertise_hosts and keep_environment not being
3684 readconf_main(checking || list_options);
3687 /* Now in directory "/" */
3689 if (cleanup_environment() == FALSE)
3690 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3693 /* If an action on specific messages is requested, or if a daemon or queue
3694 runner is being started, we need to know if Exim was called by an admin user.
3695 This is the case if the real user is root or exim, or if the real group is
3696 exim, or if one of the supplementary groups is exim or a group listed in
3697 admin_groups. We don't fail all message actions immediately if not admin_user,
3698 since some actions can be performed by non-admin users. Instead, set admin_user
3699 for later interrogation. */
3701 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3702 f.admin_user = TRUE;
3704 for (int i = 0; i < group_count && !f.admin_user; i++)
3705 if (group_list[i] == exim_gid)
3706 f.admin_user = TRUE;
3707 else if (admin_groups)
3708 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3709 if (admin_groups[j] == group_list[i])
3710 f.admin_user = TRUE;
3712 /* Another group of privileged users are the trusted users. These are root,
3713 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3714 are permitted to specify sender_addresses with -f on the command line, and
3715 other message parameters as well. */
3717 if (real_uid == root_uid || real_uid == exim_uid)
3718 f.trusted_caller = TRUE;
3722 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3723 if (trusted_users[i] == real_uid)
3724 f.trusted_caller = TRUE;
3727 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3728 if (trusted_groups[i] == real_gid)
3729 f.trusted_caller = TRUE;
3730 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3731 if (trusted_groups[i] == group_list[j])
3732 f.trusted_caller = TRUE;
3735 /* At this point, we know if the user is privileged and some command-line
3736 options become possibly impermissible, depending upon the configuration file. */
3738 if (checking && commandline_checks_require_admin && !f.admin_user)
3739 exim_fail("exim: those command-line flags are set to require admin\n");
3741 /* Handle the decoding of logging options. */
3743 decode_bits(log_selector, log_selector_size, log_notall,
3744 log_selector_string, log_options, log_options_count, US"log", 0);
3748 debug_printf("configuration file is %s\n", config_main_filename);
3749 debug_printf("log selectors =");
3750 for (int i = 0; i < log_selector_size; i++)
3751 debug_printf(" %08x", log_selector[i]);
3755 /* If domain literals are not allowed, check the sender address that was
3756 supplied with -f. Ditto for a stripped trailing dot. */
3760 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3761 exim_fail("exim: bad -f address \"%s\": domain literals not "
3762 "allowed\n", sender_address);
3763 if (f_end_dot && !strip_trailing_dot)
3764 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3765 "(trailing dot not allowed)\n", sender_address);
3768 /* See if an admin user overrode our logging. */
3770 if (cmdline_syslog_name)
3773 syslog_processname = cmdline_syslog_name;
3774 log_file_path = string_copy(CUS"syslog");
3777 /* not a panic, non-privileged users should not be able to spam paniclog */
3779 "exim: you lack sufficient privilege to specify syslog process name\n");
3781 /* Paranoia check of maximum lengths of certain strings. There is a check
3782 on the length of the log file path in log.c, which will come into effect
3783 if there are any calls to write the log earlier than this. However, if we
3784 get this far but the string is very long, it is better to stop now than to
3785 carry on and (e.g.) receive a message and then have to collapse. The call to
3786 log_write() from here will cause the ultimate panic collapse if the complete
3787 file name exceeds the buffer length. */
3789 if (Ustrlen(log_file_path) > 200)
3790 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3791 "log_file_path is longer than 200 chars: aborting");
3793 if (Ustrlen(pid_file_path) > 200)
3794 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3795 "pid_file_path is longer than 200 chars: aborting");
3797 if (Ustrlen(spool_directory) > 200)
3798 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3799 "spool_directory is longer than 200 chars: aborting");
3801 /* Length check on the process name given to syslog for its TAG field,
3802 which is only permitted to be 32 characters or less. See RFC 3164. */
3804 if (Ustrlen(syslog_processname) > 32)
3805 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3806 "syslog_processname is longer than 32 chars: aborting");
3811 log_write(0, LOG_MAIN, "%s", log_oneline);
3812 return EXIT_SUCCESS;
3815 return EXIT_FAILURE;
3817 /* In some operating systems, the environment variable TMPDIR controls where
3818 temporary files are created; Exim doesn't use these (apart from when delivering
3819 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3820 If TMPDIR is found in the environment, reset it to the value defined in the
3821 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3822 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3823 EXIM_TMPDIR by the build scripts.
3827 if (environ) for (uschar ** p = USS environ; *p; p++)
3828 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3830 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3831 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3833 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3837 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3838 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3839 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3840 called by a user who has set the TZ variable. This then affects the timestamps
3841 in log files and in Received: headers, and any created Date: header lines. The
3842 required timezone is settable in the configuration file, so nothing can be done
3843 about this earlier - but hopefully nothing will normally be logged earlier than
3844 this. We have to make a new environment if TZ is wrong, but don't bother if
3845 timestamps_utc is set, because then all times are in UTC anyway. */
3847 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3848 f.timestamps_utc = TRUE;
3851 uschar *envtz = US getenv("TZ");
3853 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3854 : timezone_string != NULL
3857 uschar **p = USS environ;
3861 if (environ) while (*p++) count++;
3862 if (!envtz) count++;
3863 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3864 if (environ) for (p = USS environ; *p; p++)
3865 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3866 if (timezone_string)
3868 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3869 sprintf(CS *newp++, "TZ=%s", timezone_string);
3874 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3875 tod_stamp(tod_log));
3879 /* Handle the case when we have removed the setuid privilege because of -C or
3880 -D. This means that the caller of Exim was not root.
3882 There is a problem if we were running as the Exim user. The sysadmin may
3883 expect this case to retain privilege because "the binary was called by the
3884 Exim user", but it hasn't, because either the -D option set macros, or the
3885 -C option set a non-trusted configuration file. There are two possibilities:
3887 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3888 to do message deliveries. Thus, the fact that it is running as a
3889 non-privileged user is plausible, and might be wanted in some special
3890 configurations. However, really_exim will have been set false when
3891 privilege was dropped, to stop Exim trying to write to its normal log
3892 files. Therefore, re-enable normal log processing, assuming the sysadmin
3893 has set up the log directory correctly.
3895 (2) If deliver_drop_privilege is not set, the configuration won't work as
3896 apparently intended, and so we log a panic message. In order to retain
3897 root for -C or -D, the caller must either be root or be invoking a
3898 trusted configuration file (when deliver_drop_privilege is false). */
3900 if ( removed_privilege
3901 && (!f.trusted_config || opt_D_used)
3902 && real_uid == exim_uid)
3903 if (deliver_drop_privilege)
3904 f.really_exim = TRUE; /* let logging work normally */
3906 log_write(0, LOG_MAIN|LOG_PANIC,
3907 "exim user lost privilege for using %s option",
3908 f.trusted_config? "-D" : "-C");
3910 /* Start up Perl interpreter if Perl support is configured and there is a
3911 perl_startup option, and the configuration or the command line specifies
3912 initializing starting. Note that the global variables are actually called
3913 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3916 if (perl_start_option != 0)
3917 opt_perl_at_start = (perl_start_option > 0);
3918 if (opt_perl_at_start && opt_perl_startup != NULL)
3921 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3922 if ((errstr = init_perl(opt_perl_startup)))
3923 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3924 opt_perl_started = TRUE;
3926 #endif /* EXIM_PERL */
3928 /* Log the arguments of the call if the configuration file said so. This is
3929 a debugging feature for finding out what arguments certain MUAs actually use.
3930 Don't attempt it if logging is disabled, or if listing variables or if
3931 verifying/testing addresses or expansions. */
3933 if ( (debug_selector & D_any || LOGGING(arguments))
3934 && f.really_exim && !list_options && !checking)
3936 uschar *p = big_buffer;
3937 Ustrcpy(p, "cwd= (failed)");
3943 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3944 p += 4 + Ustrlen(initial_cwd);
3945 /* in case p is near the end and we don't provide enough space for
3946 * string_format to be willing to write. */
3950 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3952 for (int i = 0; i < argc; i++)
3954 int len = Ustrlen(argv[i]);
3955 const uschar *printing;
3957 if (p + len + 8 >= big_buffer + big_buffer_size)
3960 log_write(0, LOG_MAIN, "%s", big_buffer);
3961 Ustrcpy(big_buffer, "...");
3964 printing = string_printing(argv[i]);
3965 if (printing[0] == 0) quote = US"\""; else
3967 const uschar *pp = printing;
3969 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3971 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3972 (p - big_buffer) - 4), printing, quote);
3975 if (LOGGING(arguments))
3976 log_write(0, LOG_MAIN, "%s", big_buffer);
3978 debug_printf("%s\n", big_buffer);
3981 /* Set the working directory to be the top-level spool directory. We don't rely
3982 on this in the code, which always uses fully qualified names, but it's useful
3983 for core dumps etc. Don't complain if it fails - the spool directory might not
3984 be generally accessible and calls with the -C option (and others) have lost
3985 privilege by now. Before the chdir, we try to ensure that the directory exists.
3988 if (Uchdir(spool_directory) != 0)
3991 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3992 dummy = /* quieten compiler */ Uchdir(spool_directory);
3993 dummy = dummy; /* yet more compiler quietening, sigh */
3996 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3997 alias file. Exim doesn't have such a concept, but this call is screwed into
3998 Sun's YP makefiles. Handle this by calling a configured script, as the real
3999 user who called Exim. The -oA option can be used to pass an argument to the
4004 (void)fclose(config_file);
4005 if (bi_command != NULL)
4009 argv[i++] = bi_command;
4010 if (alias_arg != NULL) argv[i++] = alias_arg;
4013 setgroups(group_count, group_list);
4014 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4016 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4017 (argv[1] == NULL)? US"" : argv[1]);
4019 execv(CS argv[0], (char *const *)argv);
4020 exim_fail("exim: exec failed: %s\n", strerror(errno));
4024 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4029 /* We moved the admin/trusted check to be immediately after reading the
4030 configuration file. We leave these prints here to ensure that syslog setup,
4031 logfile setup, and so on has already happened. */
4033 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4034 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4036 /* Only an admin user may start the daemon or force a queue run in the default
4037 configuration, but the queue run restriction can be relaxed. Only an admin
4038 user may request that a message be returned to its sender forthwith. Only an
4039 admin user may specify a debug level greater than D_v (because it might show
4040 passwords, etc. in lookup queries). Only an admin user may request a queue
4041 count. Only an admin user can use the test interface to scan for email
4042 (because Exim will be in the spool dir and able to look at mails). */
4046 BOOL debugset = (debug_selector & ~D_v) != 0;
4047 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4048 (count_queue && queue_list_requires_admin) ||
4049 (list_queue && queue_list_requires_admin) ||
4050 (queue_interval >= 0 && prod_requires_admin) ||
4051 (debugset && !f.running_in_test_harness))
4052 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4055 /* If the real user is not root or the exim uid, the argument for passing
4056 in an open TCP/IP connection for another message is not permitted, nor is
4057 running with the -N option for any delivery action, unless this call to exim is
4058 one that supplied an input message, or we are using a patched exim for
4059 regression testing. */
4061 if (real_uid != root_uid && real_uid != exim_uid &&
4062 (continue_hostname != NULL ||
4064 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4065 )) && !f.running_in_test_harness)
4066 exim_fail("exim: Permission denied\n");
4068 /* If the caller is not trusted, certain arguments are ignored when running for
4069 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4070 Note that authority for performing certain actions on messages is tested in the
4071 queue_action() function. */
4073 if (!f.trusted_caller && !checking)
4075 sender_host_name = sender_host_address = interface_address =
4076 sender_ident = received_protocol = NULL;
4077 sender_host_port = interface_port = 0;
4078 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4081 /* If a sender host address is set, extract the optional port number off the
4082 end of it and check its syntax. Do the same thing for the interface address.
4083 Exim exits if the syntax is bad. */
4087 if (sender_host_address != NULL)
4088 sender_host_port = check_port(sender_host_address);
4089 if (interface_address != NULL)
4090 interface_port = check_port(interface_address);
4093 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4096 if (f.trusted_caller)
4098 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4099 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4102 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4105 /* If an SMTP message is being received check to see if the standard input is a
4106 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4107 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4112 union sockaddr_46 inetd_sock;
4113 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4114 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4116 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4117 if (family == AF_INET || family == AF_INET6)
4119 union sockaddr_46 interface_sock;
4120 size = sizeof(interface_sock);
4122 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4123 interface_address = host_ntoa(-1, &interface_sock, NULL,
4126 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4128 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4131 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4132 NULL, &sender_host_port);
4133 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4134 "inetd is not supported when mua_wrapper is set");
4138 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4143 /* If the load average is going to be needed while receiving a message, get it
4144 now for those OS that require the first call to os_getloadavg() to be done as
4145 root. There will be further calls later for each message received. */
4147 #ifdef LOAD_AVG_NEEDS_ROOT
4148 if (receiving_message &&
4149 (queue_only_load >= 0 ||
4150 (f.is_inetd && smtp_load_reserve >= 0)
4153 load_average = OS_GETLOADAVG();
4157 /* The queue_only configuration option can be overridden by -odx on the command
4158 line, except that if queue_only_override is false, queue_only cannot be unset
4159 from the command line. */
4161 if (queue_only_set && (queue_only_override || arg_queue_only))
4162 queue_only = arg_queue_only;
4164 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4167 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4168 if (arg_smtp_receive_timeout >= 0)
4169 smtp_receive_timeout = arg_smtp_receive_timeout;
4171 /* If Exim was started with root privilege, unless we have already removed the
4172 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4173 except when starting the daemon or doing some kind of delivery or address
4174 testing (-bt). These are the only cases when root need to be retained. We run
4175 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4176 retained only for starting the daemon. We always do the initgroups() in this
4177 situation (controlled by the TRUE below), in order to be as close as possible
4178 to the state Exim usually runs in. */
4180 if (!unprivileged && /* originally had root AND */
4181 !removed_privilege && /* still got root AND */
4182 !f.daemon_listen && /* not starting the daemon */
4183 queue_interval <= 0 && /* (either kind of daemon) */
4185 deliver_drop_privilege || /* requested unprivileged */
4187 queue_interval < 0 && /* not running the queue */
4188 (msg_action_arg < 0 || /* and */
4189 msg_action != MSG_DELIVER) && /* not delivering and */
4190 (!checking || !f.address_test_mode) /* not address checking */
4192 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4194 /* When we are retaining a privileged uid, we still change to the exim gid. */
4199 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4200 rv = setgid(exim_gid);
4201 /* Impact of failure is that some stuff might end up with an incorrect group.
4202 We track this for failures from root, since any attempt to change privilege
4203 by root should succeed and failures should be examined. For non-root,
4204 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4205 no need to complain then. */
4207 if (!(unprivileged || removed_privilege))
4208 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4210 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4211 (long int)exim_gid, strerror(errno));
4214 /* Handle a request to scan a file for malware */
4215 if (malware_test_file)
4217 #ifdef WITH_CONTENT_SCAN
4219 set_process_info("scanning file for malware");
4220 result = malware_in_file(malware_test_file);
4223 printf("No malware found.\n");
4228 printf("Malware lookup returned non-okay/fail: %d\n", result);
4232 printf("Malware found: %s\n", malware_name);
4234 printf("Malware scan detected malware of unknown name.\n");
4236 printf("Malware scanning not enabled at compile time.\n");
4241 /* Handle a request to list the delivery queue */
4245 set_process_info("listing the queue");
4246 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4250 /* Handle a request to count the delivery queue */
4254 set_process_info("counting the queue");
4259 /* Handle actions on specific messages, except for the force delivery and
4260 message load actions, which are done below. Some actions take a whole list of
4261 message ids, which are known to continue up to the end of the arguments. Others
4262 take a single message id and then operate on the recipients list. */
4264 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4266 int yield = EXIT_SUCCESS;
4267 set_process_info("acting on specified messages");
4269 /* ACL definitions may be needed when removing a message (-Mrm) because
4270 event_action gets expanded */
4272 if (msg_action == MSG_REMOVE)
4275 if (!one_msg_action)
4277 for (i = msg_action_arg; i < argc; i++)
4278 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4279 yield = EXIT_FAILURE;
4282 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4283 recipients_arg)) yield = EXIT_FAILURE;
4287 /* We used to set up here to skip reading the ACL section, on
4288 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4289 Now, since the intro of the ${acl } expansion, ACL definitions may be
4290 needed in transports so we lost the optimisation. */
4294 /* The configuration data will have been read into POOL_PERM because we won't
4295 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4296 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4297 configuration were read into POOL_MAIN, because we don't do any resets till
4298 later on. However, it seems right, and it does ensure that both pools get used.
4301 store_pool = POOL_MAIN;
4303 /* Handle the -brt option. This is for checking out retry configurations.
4304 The next three arguments are a domain name or a complete address, and
4305 optionally two error numbers. All it does is to call the function that
4306 scans the retry configuration data. */
4308 if (test_retry_arg >= 0)
4310 retry_config *yield;
4311 int basic_errno = 0;
4315 if (test_retry_arg >= argc)
4317 printf("-brt needs a domain or address argument\n");
4318 exim_exit(EXIT_FAILURE, US"main");
4320 s1 = argv[test_retry_arg++];
4323 /* If the first argument contains no @ and no . it might be a local user
4324 or it might be a single-component name. Treat as a domain. */
4326 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4328 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4329 "being \ntreated as a one-component domain, not as a local part.\n\n",
4333 /* There may be an optional second domain arg. */
4335 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4336 s2 = argv[test_retry_arg++];
4338 /* The final arg is an error name */
4340 if (test_retry_arg < argc)
4342 uschar *ss = argv[test_retry_arg];
4344 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4347 printf("%s\n", CS error);
4348 return EXIT_FAILURE;
4351 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4352 code > 100 as an error is for matching codes to the decade. Turn them into
4353 a real error code, off the decade. */
4355 if (basic_errno == ERRNO_MAIL4XX ||
4356 basic_errno == ERRNO_RCPT4XX ||
4357 basic_errno == ERRNO_DATA4XX)
4359 int code = (more_errno >> 8) & 255;
4361 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4362 else if (code > 100)
4363 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4367 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4368 printf("No retry information found\n");
4371 more_errno = yield->more_errno;
4372 printf("Retry rule: %s ", yield->pattern);
4374 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4376 printf("quota%s%s ",
4377 (more_errno > 0)? "_" : "",
4378 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4380 else if (yield->basic_errno == ECONNREFUSED)
4382 printf("refused%s%s ",
4383 (more_errno > 0)? "_" : "",
4384 (more_errno == 'M')? "MX" :
4385 (more_errno == 'A')? "A" : "");
4387 else if (yield->basic_errno == ETIMEDOUT)
4390 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4392 if (more_errno != 0) printf("_%s",
4393 (more_errno == 'M')? "MX" : "A");
4396 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4397 printf("auth_failed ");
4400 for (retry_rule * r = yield->rules; r; r = r->next)
4402 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4403 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4409 printf(",%d.", x/1000);
4423 exim_exit(EXIT_SUCCESS, US"main");
4426 /* Handle a request to list one or more configuration options */
4427 /* If -n was set, we suppress some information */
4432 set_process_info("listing variables");
4433 if (recipients_arg >= argc)
4434 fail = !readconf_print(US"all", NULL, flag_n);
4435 else for (i = recipients_arg; i < argc; i++)
4438 (Ustrcmp(argv[i], "router") == 0 ||
4439 Ustrcmp(argv[i], "transport") == 0 ||
4440 Ustrcmp(argv[i], "authenticator") == 0 ||
4441 Ustrcmp(argv[i], "macro") == 0 ||
4442 Ustrcmp(argv[i], "environment") == 0))
4444 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4448 fail = !readconf_print(argv[i], NULL, flag_n);
4450 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4455 set_process_info("listing config");
4456 exim_exit(readconf_print(US"config", NULL, flag_n)
4457 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4461 /* Initialise subsystems as required */
4462 #ifndef DISABLE_DKIM
4468 /* Handle a request to deliver one or more messages that are already on the
4469 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4470 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4472 Delivery of specific messages is typically used for a small number when
4473 prodding by hand (when the option forced_delivery will be set) or when
4474 re-execing to regain root privilege. Each message delivery must happen in a
4475 separate process, so we fork a process for each one, and run them sequentially
4476 so that debugging output doesn't get intertwined, and to avoid spawning too
4477 many processes if a long list is given. However, don't fork for the last one;
4478 this saves a process in the common case when Exim is called to deliver just one
4481 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4483 if (prod_requires_admin && !f.admin_user)
4485 fprintf(stderr, "exim: Permission denied\n");
4486 exim_exit(EXIT_FAILURE, US"main");
4488 set_process_info("delivering specified messages");
4489 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4490 for (i = msg_action_arg; i < argc; i++)
4495 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4496 else if ((pid = fork()) == 0)
4498 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4499 _exit(EXIT_SUCCESS);
4503 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4505 exim_exit(EXIT_FAILURE, US"main");
4509 exim_exit(EXIT_SUCCESS, US"main");
4513 /* If only a single queue run is requested, without SMTP listening, we can just
4514 turn into a queue runner, with an optional starting message id. */
4516 if (queue_interval == 0 && !f.daemon_listen)
4518 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4519 (start_queue_run_id == NULL)? US"" : US" starting at ",
4520 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4521 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4522 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4524 set_process_info("running the '%s' queue (single queue run)", queue_name);
4526 set_process_info("running the queue (single queue run)");
4527 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4528 exim_exit(EXIT_SUCCESS, US"main");
4532 /* Find the login name of the real user running this process. This is always
4533 needed when receiving a message, because it is written into the spool file. It
4534 may also be used to construct a from: or a sender: header, and in this case we
4535 need the user's full name as well, so save a copy of it, checked for RFC822
4536 syntax and munged if necessary, if it hasn't previously been set by the -F
4537 argument. We may try to get the passwd entry more than once, in case NIS or
4538 other delays are in evidence. Save the home directory for use in filter testing
4543 if ((pw = getpwuid(real_uid)) != NULL)
4545 originator_login = string_copy(US pw->pw_name);
4546 originator_home = string_copy(US pw->pw_dir);
4548 /* If user name has not been set by -F, set it from the passwd entry
4549 unless -f has been used to set the sender address by a trusted user. */
4551 if (!originator_name)
4553 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4555 uschar *name = US pw->pw_gecos;
4556 uschar *amp = Ustrchr(name, '&');
4559 /* Most Unix specify that a '&' character in the gecos field is
4560 replaced by a copy of the login name, and some even specify that
4561 the first character should be upper cased, so that's what we do. */
4566 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4567 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4568 buffer[loffset] = toupper(buffer[loffset]);
4572 /* If a pattern for matching the gecos field was supplied, apply
4573 it and then expand the name string. */
4575 if (gecos_pattern && gecos_name)
4578 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4580 if (regex_match_and_setup(re, name, 0, -1))
4582 uschar *new_name = expand_string(gecos_name);
4586 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4587 "gecos field \"%s\"\n", new_name, name);
4590 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4591 "\"%s\": %s\n", gecos_name, expand_string_message);
4593 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4594 "gecos field \"%s\"\n", gecos_pattern, name);
4595 store_free((void *)re);
4597 originator_name = string_copy(name);
4600 /* A trusted caller has used -f but not -F */
4602 else originator_name = US"";
4605 /* Break the retry loop */
4610 if (++i > finduser_retries) break;
4614 /* If we cannot get a user login, log the incident and give up, unless the
4615 configuration specifies something to use. When running in the test harness,
4616 any setting of unknown_login overrides the actual name. */
4618 if (originator_login == NULL || f.running_in_test_harness)
4620 if (unknown_login != NULL)
4622 originator_login = expand_string(unknown_login);
4623 if (originator_name == NULL && unknown_username != NULL)
4624 originator_name = expand_string(unknown_username);
4625 if (originator_name == NULL) originator_name = US"";
4627 if (originator_login == NULL)
4628 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4632 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4635 originator_name = string_copy(parse_fix_phrase(originator_name,
4636 Ustrlen(originator_name), big_buffer, big_buffer_size));
4638 /* If a message is created by this call of Exim, the uid/gid of its originator
4639 are those of the caller. These values are overridden if an existing message is
4640 read in from the spool. */
4642 originator_uid = real_uid;
4643 originator_gid = real_gid;
4645 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4646 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4648 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4649 returns. We leave this till here so that the originator_ fields are available
4650 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4653 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4657 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4658 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4659 "mua_wrapper is set");
4664 /* If the sender ident has not been set (by a trusted caller) set it to
4665 the caller. This will get overwritten below for an inetd call. If a trusted
4666 caller has set it empty, unset it. */
4668 if (sender_ident == NULL) sender_ident = originator_login;
4669 else if (sender_ident[0] == 0) sender_ident = NULL;
4671 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4672 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4673 originator_* variables set. */
4675 if (test_rewrite_arg >= 0)
4677 f.really_exim = FALSE;
4678 if (test_rewrite_arg >= argc)
4680 printf("-brw needs an address argument\n");
4681 exim_exit(EXIT_FAILURE, US"main");
4683 rewrite_test(argv[test_rewrite_arg]);
4684 exim_exit(EXIT_SUCCESS, US"main");
4687 /* A locally-supplied message is considered to be coming from a local user
4688 unless a trusted caller supplies a sender address with -f, or is passing in the
4689 message via SMTP (inetd invocation or otherwise). */
4691 if ((sender_address == NULL && !smtp_input) ||
4692 (!f.trusted_caller && filter_test == FTEST_NONE))
4694 f.sender_local = TRUE;
4696 /* A trusted caller can supply authenticated_sender and authenticated_id
4697 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4698 defaults except when host checking. */
4700 if (authenticated_sender == NULL && !host_checking)
4701 authenticated_sender = string_sprintf("%s@%s", originator_login,
4702 qualify_domain_sender);
4703 if (authenticated_id == NULL && !host_checking)
4704 authenticated_id = originator_login;
4707 /* Trusted callers are always permitted to specify the sender address.
4708 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4709 is specified is the empty address. However, if a trusted caller does not
4710 specify a sender address for SMTP input, we leave sender_address unset. This
4711 causes the MAIL commands to be honoured. */
4713 if ((!smtp_input && sender_address == NULL) ||
4714 !receive_check_set_sender(sender_address))
4716 /* Either the caller is not permitted to set a general sender, or this is
4717 non-SMTP input and the trusted caller has not set a sender. If there is no
4718 sender, or if a sender other than <> is set, override with the originator's
4719 login (which will get qualified below), except when checking things. */
4721 if (sender_address == NULL /* No sender_address set */
4723 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4724 !checking)) /* Not running tests, including filter tests */
4726 sender_address = originator_login;
4727 f.sender_address_forced = FALSE;
4728 sender_address_domain = 0;
4732 /* Remember whether an untrusted caller set the sender address */
4734 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4736 /* Ensure that the sender address is fully qualified unless it is the empty
4737 address, which indicates an error message, or doesn't exist (root caller, smtp
4738 interface, no -f argument). */
4740 if (sender_address != NULL && sender_address[0] != 0 &&
4741 sender_address_domain == 0)
4742 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4743 qualify_domain_sender);
4745 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4747 /* Handle a request to verify a list of addresses, or test them for delivery.
4748 This must follow the setting of the sender address, since routers can be
4749 predicated upon the sender. If no arguments are given, read addresses from
4750 stdin. Set debug_level to at least D_v to get full output for address testing.
4753 if (verify_address_mode || f.address_test_mode)
4756 int flags = vopt_qualify;
4758 if (verify_address_mode)
4760 if (!verify_as_sender) flags |= vopt_is_recipient;
4761 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4766 flags |= vopt_is_recipient;
4767 debug_selector |= D_v;
4768 debug_file = stderr;
4769 debug_fd = fileno(debug_file);
4770 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4773 if (recipients_arg < argc)
4775 while (recipients_arg < argc)
4777 uschar *s = argv[recipients_arg++];
4780 BOOL finished = FALSE;
4781 uschar *ss = parse_find_address_end(s, FALSE);
4782 if (*ss == ',') *ss = 0; else finished = TRUE;
4783 test_address(s, flags, &exit_value);
4786 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4793 uschar *s = get_stdinput(NULL, NULL);
4794 if (s == NULL) break;
4795 test_address(s, flags, &exit_value);
4799 exim_exit(exit_value, US"main");
4802 /* Handle expansion checking. Either expand items on the command line, or read
4803 from stdin if there aren't any. If -Mset was specified, load the message so
4804 that its variables can be used, but restrict this facility to admin users.
4805 Otherwise, if -bem was used, read a message from stdin. */
4809 dns_init(FALSE, FALSE, FALSE);
4810 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4812 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4814 exim_fail("exim: permission denied\n");
4815 message_id = argv[msg_action_arg];
4816 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4817 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4818 printf ("Failed to load message datafile %s\n", message_id);
4819 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4820 printf ("Failed to load message %s\n", message_id);
4823 /* Read a test message from a file. We fudge it up to be on stdin, saving
4824 stdin itself for later reading of expansion strings. */
4826 else if (expansion_test_message)
4828 int save_stdin = dup(0);
4829 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4831 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4834 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4835 message_ended = END_NOTENDED;
4836 read_message_body(receive_msg(extract_recipients));
4837 message_linecount += body_linecount;
4838 (void)dup2(save_stdin, 0);
4839 (void)close(save_stdin);
4840 clearerr(stdin); /* Required by Darwin */
4843 /* Only admin users may see config-file macros this way */
4845 if (!f.admin_user) macros_user = macros = mlast = NULL;
4847 /* Allow $recipients for this testing */
4849 f.enable_dollar_recipients = TRUE;
4851 /* Expand command line items */
4853 if (recipients_arg < argc)
4854 while (recipients_arg < argc)
4855 expansion_test_line(argv[recipients_arg++]);
4861 char *(*fn_readline)(const char *) = NULL;
4862 void (*fn_addhist)(const char *) = NULL;
4866 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4869 while (s = get_stdinput(fn_readline, fn_addhist))
4870 expansion_test_line(s);
4873 if (dlhandle) dlclose(dlhandle);
4877 /* The data file will be open after -Mset */
4879 if (deliver_datafile >= 0)
4881 (void)close(deliver_datafile);
4882 deliver_datafile = -1;
4885 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4889 /* The active host name is normally the primary host name, but it can be varied
4890 for hosts that want to play several parts at once. We need to ensure that it is
4891 set for host checking, and for receiving messages. */
4893 smtp_active_hostname = primary_hostname;
4894 if (raw_active_hostname != NULL)
4896 uschar *nah = expand_string(raw_active_hostname);
4899 if (!f.expand_string_forcedfail)
4900 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4901 "(smtp_active_hostname): %s", raw_active_hostname,
4902 expand_string_message);
4904 else if (nah[0] != 0) smtp_active_hostname = nah;
4907 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4908 given IP address so that the blocking and relay configuration can be tested.
4909 Unless a sender_ident was set by -oMt, we discard it (the default is the
4910 caller's login name). An RFC 1413 call is made only if we are running in the
4911 test harness and an incoming interface and both ports are specified, because
4912 there is no TCP/IP call to find the ident for. */
4919 if (!sender_ident_set)
4921 sender_ident = NULL;
4922 if (f.running_in_test_harness && sender_host_port != 0 &&
4923 interface_address != NULL && interface_port != 0)
4924 verify_get_ident(1413);
4927 /* In case the given address is a non-canonical IPv6 address, canonicalize
4928 it. The code works for both IPv4 and IPv6, as it happens. */
4930 size = host_aton(sender_host_address, x);
4931 sender_host_address = store_get(48); /* large enough for full IPv6 */
4932 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4934 /* Now set up for testing */
4936 host_build_sender_fullhost();
4940 f.sender_local = FALSE;
4941 f.sender_host_notsocket = TRUE;
4942 debug_file = stderr;
4943 debug_fd = fileno(debug_file);
4944 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4945 "**** but without any ident (RFC 1413) callback.\n"
4946 "**** This is not for real!\n\n",
4947 sender_host_address);
4949 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4950 if (verify_check_host(&hosts_connection_nolog) == OK)
4951 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4952 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4954 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4955 because a log line has already been written for all its failure exists
4956 (usually "connection refused: <reason>") and writing another one is
4957 unnecessary clutter. */
4959 if (smtp_start_session())
4961 for (reset_point = store_get(0); ; store_reset(reset_point))
4963 if (smtp_setup_msg() <= 0) break;
4964 if (!receive_msg(FALSE)) break;
4966 return_path = sender_address = NULL;
4967 dnslist_domain = dnslist_matched = NULL;
4968 #ifndef DISABLE_DKIM
4969 dkim_cur_signer = NULL;
4972 deliver_localpart_orig = NULL;
4973 deliver_domain_orig = NULL;
4974 callout_address = sending_ip_address = NULL;
4975 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4979 exim_exit(EXIT_SUCCESS, US"main");
4983 /* Arrange for message reception if recipients or SMTP were specified;
4984 otherwise complain unless a version print (-bV) happened or this is a filter
4985 verification test or info dump.
4986 In the former case, show the configuration file name. */
4988 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4990 if (version_printed)
4992 if (Ustrchr(config_main_filelist, ':'))
4993 printf("Configuration file search path is %s\n", config_main_filelist);
4994 printf("Configuration file is %s\n", config_main_filename);
4995 return EXIT_SUCCESS;
4998 if (info_flag != CMDINFO_NONE)
5000 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5001 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5004 if (filter_test == FTEST_NONE)
5005 exim_usage(called_as);
5009 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5010 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5011 that we are not called from inetd, because that is rejected above. The
5012 following configuration settings are forced here:
5014 (1) Synchronous delivery (-odi)
5015 (2) Errors to stderr (-oep == -oeq)
5016 (3) No parallel remote delivery
5017 (4) Unprivileged delivery
5019 We don't force overall queueing options because there are several of them;
5020 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5021 to override any SMTP queueing. */
5025 f.synchronous_delivery = TRUE;
5026 arg_error_handling = ERRORS_STDERR;
5027 remote_max_parallel = 1;
5028 deliver_drop_privilege = TRUE;
5029 f.queue_smtp = FALSE;
5030 queue_smtp_domains = NULL;
5032 message_utf8_downconvert = -1; /* convert-if-needed */
5037 /* Prepare to accept one or more new messages on the standard input. When a
5038 message has been read, its id is returned in message_id[]. If doing immediate
5039 delivery, we fork a delivery process for each received message, except for the
5040 last one, where we can save a process switch.
5042 It is only in non-smtp mode that error_handling is allowed to be changed from
5043 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5044 sendmail error modes other than -oem ever actually used? Later: yes.) */
5046 if (!smtp_input) error_handling = arg_error_handling;
5048 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5049 logging being sent down the socket and make an identd call to get the
5052 else if (f.is_inetd)
5054 (void)fclose(stderr);
5055 exim_nullstd(); /* Re-open to /dev/null */
5056 verify_get_ident(IDENT_PORT);
5057 host_build_sender_fullhost();
5058 set_process_info("handling incoming connection from %s via inetd",
5062 /* If the sender host address has been set, build sender_fullhost if it hasn't
5063 already been done (which it will have been for inetd). This caters for the
5064 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5065 so that the test for IP options is skipped for -bs input. */
5067 if (sender_host_address && !sender_fullhost)
5069 host_build_sender_fullhost();
5070 set_process_info("handling incoming connection from %s via -oMa",
5072 f.sender_host_notsocket = TRUE;
5075 /* Otherwise, set the sender host as unknown except for inetd calls. This
5076 prevents host checking in the case of -bs not from inetd and also for -bS. */
5078 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5080 /* If stdout does not exist, then dup stdin to stdout. This can happen
5081 if exim is started from inetd. In this case fd 0 will be set to the socket,
5082 but fd 1 will not be set. This also happens for passed SMTP channels. */
5084 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5086 /* Set up the incoming protocol name and the state of the program. Root is
5087 allowed to force received protocol via the -oMr option above. If we have come
5088 via inetd, the process info has already been set up. We don't set
5089 received_protocol here for smtp input, as it varies according to
5090 batch/HELO/EHLO/AUTH/TLS. */
5094 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5095 smtp_batched_input? "batched " : "",
5096 (sender_address!= NULL)? sender_address : originator_login);
5100 int old_pool = store_pool;
5101 store_pool = POOL_PERM;
5102 if (!received_protocol)
5103 received_protocol = string_sprintf("local%s", called_as);
5104 store_pool = old_pool;
5105 set_process_info("accepting a local non-SMTP message from <%s>",
5109 /* Initialize the session_local_queue-only flag (this will be ignored if
5110 mua_wrapper is set) */
5113 session_local_queue_only = queue_only;
5115 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5116 the spool if so configured. On failure, we must not attempt to send an error
5117 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5118 error code is given.) */
5120 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5121 exim_fail("exim: insufficient disk space\n");
5123 /* If this is smtp input of any kind, real or batched, handle the start of the
5126 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5127 because a log line has already been written for all its failure exists
5128 (usually "connection refused: <reason>") and writing another one is
5129 unnecessary clutter. */
5135 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5136 if (verify_check_host(&hosts_connection_nolog) == OK)
5137 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5138 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5139 if (!smtp_start_session())
5142 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5146 /* Otherwise, set up the input size limit here. */
5150 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5151 if (expand_string_message)
5152 if (thismessage_size_limit == -1)
5153 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5154 "message_size_limit: %s", expand_string_message);
5156 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5157 "message_size_limit: %s", expand_string_message);
5160 /* Loop for several messages when reading SMTP input. If we fork any child
5161 processes, we don't want to wait for them unless synchronous delivery is
5162 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5163 same as SIG_DFL, despite the fact that documentation often lists the default as
5164 "ignore". This is a confusing area. This is what I know:
5166 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5167 processes that complete simply to go away without ever becoming defunct. You
5168 can't then wait for them - but we don't want to wait for them in the
5169 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5170 happen for all OS (e.g. *BSD is different).
5172 But that's not the end of the story. Some (many? all?) systems have the
5173 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5174 has by default, so it seems that the difference is merely one of default
5175 (compare restarting vs non-restarting signals).
5177 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5178 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5179 of the loop below. Paranoia rules.
5181 February 2003: That's *still* not the end of the story. There are now versions
5182 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5183 process then calls waitpid(), a grumble is written to the system log, because
5184 this is logically inconsistent. In other words, it doesn't like the paranoia.
5185 As a consequence of this, the waitpid() below is now excluded if we are sure
5186 that SIG_IGN works. */
5188 if (!f.synchronous_delivery)
5191 struct sigaction act;
5192 act.sa_handler = SIG_IGN;
5193 sigemptyset(&(act.sa_mask));
5194 act.sa_flags = SA_NOCLDWAIT;
5195 sigaction(SIGCHLD, &act, NULL);
5197 signal(SIGCHLD, SIG_IGN);
5201 /* Save the current store pool point, for resetting at the start of
5202 each message, and save the real sender address, if any. */
5204 reset_point = store_get(0);
5205 real_sender_address = sender_address;
5207 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5208 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5215 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5216 input and build the recipients list, before calling receive_msg() to read the
5217 message proper. Whatever sender address is given in the SMTP transaction is
5218 often ignored for local senders - we use the actual sender, which is normally
5219 either the underlying user running this process or a -f argument provided by
5220 a trusted caller. It is saved in real_sender_address. The test for whether to
5221 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5226 if ((rc = smtp_setup_msg()) > 0)
5228 if (real_sender_address != NULL &&
5229 !receive_check_set_sender(sender_address))
5231 sender_address = raw_sender = real_sender_address;
5232 sender_address_unrewritten = NULL;
5235 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5236 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5237 the very end. The result of the ACL is ignored (as for other non-SMTP
5238 messages). It is run for its potential side effects. */
5240 if (smtp_batched_input && acl_not_smtp_start != NULL)
5242 uschar *user_msg, *log_msg;
5243 f.enable_dollar_recipients = TRUE;
5244 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5245 &user_msg, &log_msg);
5246 f.enable_dollar_recipients = FALSE;
5249 /* Now get the data for the message */
5251 more = receive_msg(extract_recipients);
5252 if (message_id[0] == 0)
5254 cancel_cutthrough_connection(TRUE, US"receive dropped");
5255 if (more) goto moreloop;
5256 smtp_log_no_mail(); /* Log no mail if configured */
5257 exim_exit(EXIT_FAILURE, US"receive toplevel");
5262 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5263 smtp_log_no_mail(); /* Log no mail if configured */
5264 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5268 /* In the non-SMTP case, we have all the information from the command
5269 line, but must process it in case it is in the more general RFC822
5270 format, and in any case, to detect syntax errors. Also, it appears that
5271 the use of comma-separated lists as single arguments is common, so we
5272 had better support them. */
5277 int count = argc - recipients_arg;
5278 uschar **list = argv + recipients_arg;
5280 /* These options cannot be changed dynamically for non-SMTP messages */
5282 f.active_local_sender_retain = local_sender_retain;
5283 f.active_local_from_check = local_from_check;
5285 /* Save before any rewriting */
5287 raw_sender = string_copy(sender_address);
5289 /* Loop for each argument */
5291 for (int i = 0; i < count; i++)
5293 int start, end, domain;
5295 uschar *s = list[i];
5297 /* Loop for each comma-separated address */
5301 BOOL finished = FALSE;
5303 uschar *ss = parse_find_address_end(s, FALSE);
5305 if (*ss == ',') *ss = 0; else finished = TRUE;
5307 /* Check max recipients - if -t was used, these aren't recipients */
5309 if (recipients_max > 0 && ++rcount > recipients_max &&
5310 !extract_recipients)
5311 if (error_handling == ERRORS_STDERR)
5313 fprintf(stderr, "exim: too many recipients\n");
5314 exim_exit(EXIT_FAILURE, US"main");
5318 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5319 errors_sender_rc : EXIT_FAILURE;
5323 BOOL b = allow_utf8_domains;
5324 allow_utf8_domains = TRUE;
5327 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5330 if (string_is_utf8(recipient))
5331 message_smtputf8 = TRUE;
5333 allow_utf8_domains = b;
5336 if (domain == 0 && !f.allow_unqualified_recipient)
5339 errmess = US"unqualified recipient address not allowed";
5342 if (recipient == NULL)
5344 if (error_handling == ERRORS_STDERR)
5346 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5347 string_printing(list[i]), errmess);
5348 exim_exit(EXIT_FAILURE, US"main");
5354 eblock.text1 = string_printing(list[i]);
5355 eblock.text2 = errmess;
5357 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5358 errors_sender_rc : EXIT_FAILURE;
5362 receive_add_recipient(recipient, -1);
5365 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5369 /* Show the recipients when debugging */
5373 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5374 if (recipients_list != NULL)
5376 debug_printf("Recipients:\n");
5377 for (int i = 0; i < recipients_count; i++)
5378 debug_printf(" %s\n", recipients_list[i].address);
5382 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5383 ignored; rejecting here would just add complication, and it can just as
5384 well be done later. Allow $recipients to be visible in the ACL. */
5386 if (acl_not_smtp_start)
5388 uschar *user_msg, *log_msg;
5389 f.enable_dollar_recipients = TRUE;
5390 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5391 &user_msg, &log_msg);
5392 f.enable_dollar_recipients = FALSE;
5395 /* Pause for a while waiting for input. If none received in that time,
5396 close the logfile, if we had one open; then if we wait for a long-running
5397 datasource (months, in one use-case) log rotation will not leave us holding
5400 if (!receive_timeout)
5402 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5405 FD_ZERO(&r); FD_SET(0, &r);
5406 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5409 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5410 will just read the headers for the message, and not write anything onto the
5413 message_ended = END_NOTENDED;
5414 more = receive_msg(extract_recipients);
5416 /* more is always FALSE here (not SMTP message) when reading a message
5417 for real; when reading the headers of a message for filter testing,
5418 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5420 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5421 } /* Non-SMTP message reception */
5423 /* If this is a filter testing run, there are headers in store, but
5424 no message on the spool. Run the filtering code in testing mode, setting
5425 the domain to the qualify domain and the local part to the current user,
5426 unless they have been set by options. The prefix and suffix are left unset
5427 unless specified. The the return path is set to to the sender unless it has
5428 already been set from a return-path header in the message. */
5430 if (filter_test != FTEST_NONE)
5432 deliver_domain = (ftest_domain != NULL)?
5433 ftest_domain : qualify_domain_recipient;
5434 deliver_domain_orig = deliver_domain;
5435 deliver_localpart = (ftest_localpart != NULL)?
5436 ftest_localpart : originator_login;
5437 deliver_localpart_orig = deliver_localpart;
5438 deliver_localpart_prefix = ftest_prefix;
5439 deliver_localpart_suffix = ftest_suffix;
5440 deliver_home = originator_home;
5442 if (return_path == NULL)
5444 printf("Return-path copied from sender\n");
5445 return_path = string_copy(sender_address);
5448 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5449 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5451 receive_add_recipient(
5452 string_sprintf("%s%s%s@%s",
5453 (ftest_prefix == NULL)? US"" : ftest_prefix,
5455 (ftest_suffix == NULL)? US"" : ftest_suffix,
5456 deliver_domain), -1);
5458 printf("Recipient = %s\n", recipients_list[0].address);
5459 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5460 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5462 if (chdir("/")) /* Get away from wherever the user is running this from */
5464 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5465 exim_exit(EXIT_FAILURE, US"main");
5468 /* Now we run either a system filter test, or a user filter test, or both.
5469 In the latter case, headers added by the system filter will persist and be
5470 available to the user filter. We need to copy the filter variables
5473 if ((filter_test & FTEST_SYSTEM) != 0)
5474 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5475 exim_exit(EXIT_FAILURE, US"main");
5477 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5479 if ((filter_test & FTEST_USER) != 0)
5480 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5481 exim_exit(EXIT_FAILURE, US"main");
5483 exim_exit(EXIT_SUCCESS, US"main");
5486 /* Else act on the result of message reception. We should not get here unless
5487 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5488 will be TRUE. If it is not, check on the number of messages received in this
5491 if (!session_local_queue_only &&
5492 smtp_accept_queue_per_connection > 0 &&
5493 receive_messagecount > smtp_accept_queue_per_connection)
5495 session_local_queue_only = TRUE;
5496 queue_only_reason = 2;
5499 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5500 and queue_only_load is set, check that the load average is below it. If it is
5501 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5502 default), we put the whole session into queue_only mode. It then remains this
5503 way for any subsequent messages on the same SMTP connection. This is a
5504 deliberate choice; even though the load average may fall, it doesn't seem
5505 right to deliver later messages on the same call when not delivering earlier
5506 ones. However, there are odd cases where this is not wanted, so this can be
5507 changed by setting queue_only_load_latch false. */
5509 local_queue_only = session_local_queue_only;
5510 if (!local_queue_only && queue_only_load >= 0)
5512 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5513 if (local_queue_only)
5515 queue_only_reason = 3;
5516 if (queue_only_load_latch) session_local_queue_only = TRUE;
5520 /* If running as an MUA wrapper, all queueing options and freezing options
5524 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5526 /* Log the queueing here, when it will get a message id attached, but
5527 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5530 if (local_queue_only)
5532 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5533 switch(queue_only_reason)
5536 log_write(L_delay_delivery,
5537 LOG_MAIN, "no immediate delivery: more than %d messages "
5538 "received in one connection", smtp_accept_queue_per_connection);
5542 log_write(L_delay_delivery,
5543 LOG_MAIN, "no immediate delivery: load average %.2f",
5544 (double)load_average/1000.0);
5549 else if (f.queue_only_policy || f.deliver_freeze)
5550 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5552 /* Else do the delivery unless the ACL or local_scan() called for queue only
5553 or froze the message. Always deliver in a separate process. A fork failure is
5554 not a disaster, as the delivery will eventually happen on a subsequent queue
5555 run. The search cache must be tidied before the fork, as the parent will
5556 do it before exiting. The child will trigger a lookup failure and
5557 thereby defer the delivery if it tries to use (for example) a cached ldap
5558 connection that the parent has called unbind on. */
5565 if ((pid = fork()) == 0)
5568 close_unwanted(); /* Close unwanted file descriptors and TLS */
5569 exim_nullstd(); /* Ensure std{in,out,err} exist */
5571 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5572 mode, deliver_drop_privilege is forced TRUE). */
5574 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5576 delivery_re_exec(CEE_EXEC_EXIT);
5577 /* Control does not return here. */
5580 /* No need to re-exec */
5582 rc = deliver_message(message_id, FALSE, FALSE);
5584 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5585 EXIT_SUCCESS : EXIT_FAILURE);
5590 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5591 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5592 "process: %s", strerror(errno));
5596 release_cutthrough_connection(US"msg passed for delivery");
5598 /* In the parent, wait if synchronous delivery is required. This will
5599 always be the case in MUA wrapper mode. */
5601 if (f.synchronous_delivery)
5604 while (wait(&status) != pid);
5605 if ((status & 0x00ff) != 0)
5606 log_write(0, LOG_MAIN|LOG_PANIC,
5607 "process %d crashed with signal %d while delivering %s",
5608 (int)pid, status & 0x00ff, message_id);
5609 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5614 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5615 automatically reaps children (see comments above the loop), clear away any
5616 finished subprocesses here, in case there are lots of messages coming in
5617 from the same source. */
5619 #ifndef SIG_IGN_WORKS
5620 while (waitpid(-1, NULL, WNOHANG) > 0);
5624 return_path = sender_address = NULL;
5625 authenticated_sender = NULL;
5626 deliver_localpart_orig = NULL;
5627 deliver_domain_orig = NULL;
5628 deliver_host = deliver_host_address = NULL;
5629 dnslist_domain = dnslist_matched = NULL;
5630 #ifdef WITH_CONTENT_SCAN
5631 malware_name = NULL;
5633 callout_address = NULL;
5634 sending_ip_address = NULL;
5636 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5638 store_reset(reset_point);
5641 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5642 return 0; /* To stop compiler warning */