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 /* For now, regard all RE results as potentially tainted. We might need
46 more intelligence on this point. */
47 return store_get((int)size, TRUE);
51 function_dummy_free(void *block) { block = block; }
54 function_store_malloc(size_t size)
56 return store_malloc((int)size);
60 function_store_free(void *block)
68 /*************************************************
69 * Enums for cmdline interface *
70 *************************************************/
72 enum commandline_info { CMDINFO_NONE=0,
73 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
78 /*************************************************
79 * Compile regular expression and panic on fail *
80 *************************************************/
82 /* This function is called when failure to compile a regular expression leads
83 to a panic exit. In other cases, pcre_compile() is called directly. In many
84 cases where this function is used, the results of the compilation are to be
85 placed in long-lived store, so we temporarily reset the store management
86 functions that PCRE uses if the use_malloc flag is set.
89 pattern the pattern to compile
90 caseless TRUE if caseless matching is required
91 use_malloc TRUE if compile into malloc store
93 Returns: pointer to the compiled pattern
97 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
100 int options = PCRE_COPT;
105 pcre_malloc = function_store_malloc;
106 pcre_free = function_store_free;
108 if (caseless) options |= PCRE_CASELESS;
109 yield = pcre_compile(CCS pattern, options, (const char **)&error, &offset, NULL);
110 pcre_malloc = function_store_get;
111 pcre_free = function_dummy_free;
113 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
114 "%s at offset %d while compiling %s", error, offset, pattern);
121 /*************************************************
122 * Execute regular expression and set strings *
123 *************************************************/
125 /* This function runs a regular expression match, and sets up the pointers to
126 the matched substrings.
129 re the compiled expression
130 subject the subject string
131 options additional PCRE options
132 setup if < 0 do full setup
133 if >= 0 setup from setup+1 onwards,
134 excluding the full matched string
136 Returns: TRUE or FALSE
140 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
142 int ovector[3*(EXPAND_MAXN+1)];
143 uschar * s = string_copy(subject); /* de-constifying */
144 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
145 PCRE_EOPT | options, ovector, nelem(ovector));
147 if (n == 0) n = EXPAND_MAXN + 1;
150 expand_nmax = setup < 0 ? 0 : setup + 1;
151 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
153 expand_nstring[expand_nmax] = s + ovector[nn];
154 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
164 /*************************************************
165 * Set up processing details *
166 *************************************************/
168 /* Save a text string for dumping when SIGUSR1 is received.
169 Do checks for overruns.
171 Arguments: format and arguments, as for printf()
176 set_process_info(const char *format, ...)
178 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
183 g = string_fmt_append(&gs, "%5d ", (int)getpid());
185 va_start(ap, format);
186 if (!string_vformat(g, 0, format, ap))
189 g = string_cat(&gs, US"**** string overflowed buffer ****");
191 g = string_catn(g, US"\n", 1);
192 string_from_gstring(g);
193 process_info_len = g->ptr;
194 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
198 /***********************************************
199 * Handler for SIGTERM *
200 ***********************************************/
203 term_handler(int sig)
209 /*************************************************
210 * Handler for SIGUSR1 *
211 *************************************************/
213 /* SIGUSR1 causes any exim process to write to the process log details of
214 what it is currently doing. It will only be used if the OS is capable of
215 setting up a handler that causes automatic restarting of any system call
216 that is in progress at the time.
218 This function takes care to be signal-safe.
220 Argument: the signal number (SIGUSR1)
225 usr1_handler(int sig)
229 os_restarting_signal(sig, usr1_handler);
231 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
233 /* If we are already running as the Exim user, try to create it in the
234 current process (assuming spool_directory exists). Otherwise, if we are
235 root, do the creation in an exim:exim subprocess. */
237 int euid = geteuid();
238 if (euid == exim_uid)
239 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
240 else if (euid == root_uid)
241 fd = log_create_as_exim(process_log_path);
244 /* If we are neither exim nor root, or if we failed to create the log file,
245 give up. There is not much useful we can do with errors, since we don't want
246 to disrupt whatever is going on outside the signal handler. */
250 (void)write(fd, process_info, process_info_len);
256 /*************************************************
258 *************************************************/
260 /* This handler is enabled most of the time that Exim is running. The handler
261 doesn't actually get used unless alarm() has been called to set a timer, to
262 place a time limit on a system call of some kind. When the handler is run, it
265 There are some other SIGALRM handlers that are used in special cases when more
266 than just a flag setting is required; for example, when reading a message's
267 input. These are normally set up in the code module that uses them, and the
268 SIGALRM handler is reset to this one afterwards.
270 Argument: the signal value (SIGALRM)
275 sigalrm_handler(int sig)
277 sig = sig; /* Keep picky compilers happy */
279 os_non_restarting_signal(SIGALRM, sigalrm_handler);
284 /*************************************************
285 * Sleep for a fractional time interval *
286 *************************************************/
288 /* This function is called by millisleep() and exim_wait_tick() to wait for a
289 period of time that may include a fraction of a second. The coding is somewhat
290 tedious. We do not expect setitimer() ever to fail, but if it does, the process
291 will wait for ever, so we panic in this instance. (There was a case of this
292 when a bug in a function that calls milliwait() caused it to pass invalid data.
293 That's when I added the check. :-)
295 We assume it to be not worth sleeping for under 100us; this value will
296 require revisiting as hardware advances. This avoids the issue of
297 a zero-valued timer setting meaning "never fire".
299 Argument: an itimerval structure containing the interval
304 milliwait(struct itimerval *itval)
307 sigset_t old_sigmask;
309 if (itval->it_value.tv_usec < 100 && itval->it_value.tv_sec == 0)
311 (void)sigemptyset(&sigmask); /* Empty mask */
312 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
313 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
314 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
315 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
316 "setitimer() failed: %s", strerror(errno));
317 (void)sigfillset(&sigmask); /* All signals */
318 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
319 (void)sigsuspend(&sigmask); /* Until SIGALRM */
320 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
326 /*************************************************
327 * Millisecond sleep function *
328 *************************************************/
330 /* The basic sleep() function has a granularity of 1 second, which is too rough
331 in some cases - for example, when using an increasing delay to slow down
334 Argument: number of millseconds
341 struct itimerval itval;
342 itval.it_interval.tv_sec = 0;
343 itval.it_interval.tv_usec = 0;
344 itval.it_value.tv_sec = msec/1000;
345 itval.it_value.tv_usec = (msec % 1000) * 1000;
351 /*************************************************
352 * Compare microsecond times *
353 *************************************************/
360 Returns: -1, 0, or +1
364 exim_tvcmp(struct timeval *t1, struct timeval *t2)
366 if (t1->tv_sec > t2->tv_sec) return +1;
367 if (t1->tv_sec < t2->tv_sec) return -1;
368 if (t1->tv_usec > t2->tv_usec) return +1;
369 if (t1->tv_usec < t2->tv_usec) return -1;
376 /*************************************************
377 * Clock tick wait function *
378 *************************************************/
380 /* Exim uses a time + a pid to generate a unique identifier in two places: its
381 message IDs, and in file names for maildir deliveries. Because some OS now
382 re-use pids within the same second, sub-second times are now being used.
383 However, for absolute certainty, we must ensure the clock has ticked before
384 allowing the relevant process to complete. At the time of implementation of
385 this code (February 2003), the speed of processors is such that the clock will
386 invariably have ticked already by the time a process has done its job. This
387 function prepares for the time when things are faster - and it also copes with
388 clocks that go backwards.
391 then_tv A timeval which was used to create uniqueness; its usec field
392 has been rounded down to the value of the resolution.
393 We want to be sure the current time is greater than this.
394 resolution The resolution that was used to divide the microseconds
395 (1 for maildir, larger for message ids)
401 exim_wait_tick(struct timeval *then_tv, int resolution)
403 struct timeval now_tv;
404 long int now_true_usec;
406 (void)gettimeofday(&now_tv, NULL);
407 now_true_usec = now_tv.tv_usec;
408 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
410 if (exim_tvcmp(&now_tv, then_tv) <= 0)
412 struct itimerval itval;
413 itval.it_interval.tv_sec = 0;
414 itval.it_interval.tv_usec = 0;
415 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
416 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
418 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
419 negative value for the microseconds is possible only in the case when "now"
420 is more than a second less than "then". That means that itval.it_value.tv_sec
421 is greater than zero. The following correction is therefore safe. */
423 if (itval.it_value.tv_usec < 0)
425 itval.it_value.tv_usec += 1000000;
426 itval.it_value.tv_sec -= 1;
429 DEBUG(D_transport|D_receive)
431 if (!f.running_in_test_harness)
433 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
434 then_tv->tv_sec, (long) then_tv->tv_usec,
435 now_tv.tv_sec, (long) now_tv.tv_usec);
436 debug_printf("waiting " TIME_T_FMT ".%06lu\n",
437 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
448 /*************************************************
449 * Call fopen() with umask 777 and adjust mode *
450 *************************************************/
452 /* Exim runs with umask(0) so that files created with open() have the mode that
453 is specified in the open() call. However, there are some files, typically in
454 the spool directory, that are created with fopen(). They end up world-writeable
455 if no precautions are taken. Although the spool directory is not accessible to
456 the world, this is an untidiness. So this is a wrapper function for fopen()
457 that sorts out the mode of the created file.
460 filename the file name
461 options the fopen() options
462 mode the required mode
464 Returns: the fopened FILE or NULL
468 modefopen(const uschar *filename, const char *options, mode_t mode)
470 mode_t saved_umask = umask(0777);
471 FILE *f = Ufopen(filename, options);
472 (void)umask(saved_umask);
473 if (f != NULL) (void)fchmod(fileno(f), mode);
478 /*************************************************
479 * Ensure stdin, stdout, and stderr exist *
480 *************************************************/
482 /* Some operating systems grumble if an exec() happens without a standard
483 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
484 file will be opened and will use these fd values, and then some other bit of
485 code will assume, for example, that it can write error messages to stderr.
486 This function ensures that fds 0, 1, and 2 are open if they do not already
487 exist, by connecting them to /dev/null.
489 This function is also used to ensure that std{in,out,err} exist at all times,
490 so that if any library that Exim calls tries to use them, it doesn't crash.
501 for (int i = 0; i <= 2; i++)
503 if (fstat(i, &statbuf) < 0 && errno == EBADF)
505 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
506 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
507 string_open_failed(errno, "/dev/null", NULL));
508 if (devnull != i) (void)dup2(devnull, i);
511 if (devnull > 2) (void)close(devnull);
517 /*************************************************
518 * Close unwanted file descriptors for delivery *
519 *************************************************/
521 /* This function is called from a new process that has been forked to deliver
522 an incoming message, either directly, or using exec.
524 We want any smtp input streams to be closed in this new process. However, it
525 has been observed that using fclose() here causes trouble. When reading in -bS
526 input, duplicate copies of messages have been seen. The files will be sharing a
527 file pointer with the parent process, and it seems that fclose() (at least on
528 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
529 least sometimes. Hence we go for closing the underlying file descriptors.
531 If TLS is active, we want to shut down the TLS library, but without molesting
532 the parent's SSL connection.
534 For delivery of a non-SMTP message, we want to close stdin and stdout (and
535 stderr unless debugging) because the calling process might have set them up as
536 pipes and be waiting for them to close before it waits for the submission
537 process to terminate. If they aren't closed, they hold up the calling process
538 until the initial delivery process finishes, which is not what we want.
540 Exception: We do want it for synchronous delivery!
542 And notwithstanding all the above, if D_resolver is set, implying resolver
543 debugging, leave stdout open, because that's where the resolver writes its
546 When we close stderr (which implies we've also closed stdout), we also get rid
547 of any controlling terminal.
559 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
561 (void)close(fileno(smtp_in));
562 (void)close(fileno(smtp_out));
567 (void)close(0); /* stdin */
568 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
569 if (debug_selector == 0) /* stderr */
571 if (!f.synchronous_delivery)
584 /*************************************************
586 *************************************************/
588 /* This function sets a new uid and gid permanently, optionally calling
589 initgroups() to set auxiliary groups. There are some special cases when running
590 Exim in unprivileged modes. In these situations the effective uid will not be
591 root; if we already have the right effective uid/gid, and don't need to
592 initialize any groups, leave things as they are.
597 igflag TRUE if initgroups() wanted
598 msg text to use in debugging output and failure log
600 Returns: nothing; bombs out on failure
604 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
606 uid_t euid = geteuid();
607 gid_t egid = getegid();
609 if (euid == root_uid || euid != uid || egid != gid || igflag)
611 /* At least one OS returns +1 for initgroups failure, so just check for
616 struct passwd *pw = getpwuid(uid);
618 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
619 "no passwd entry for uid=%ld", (long int)uid);
621 if (initgroups(pw->pw_name, gid) != 0)
622 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
623 (long int)uid, strerror(errno));
626 if (setgid(gid) < 0 || setuid(uid) < 0)
627 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
628 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
631 /* Debugging output included uid/gid and all groups */
635 int group_count, save_errno;
636 gid_t group_list[EXIM_GROUPLIST_SIZE];
637 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
638 (long int)geteuid(), (long int)getegid(), (long int)getpid());
639 group_count = getgroups(nelem(group_list), group_list);
641 debug_printf(" auxiliary group list:");
643 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
644 else if (group_count < 0)
645 debug_printf(" <error: %s>", strerror(save_errno));
646 else debug_printf(" <none>");
654 /*************************************************
656 *************************************************/
658 /* Exim exits via this function so that it always clears up any open
664 Returns: does not return
668 exim_exit(int rc, const uschar * process)
673 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
674 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
675 process ? "(" : "", process, process ? ") " : "", rc);
681 exim_underbar_exit(int rc)
689 /* Print error string, then die */
691 exim_fail(const char * fmt, ...)
695 vfprintf(stderr, fmt, ap);
699 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
700 of chown()/fchown(). See src/functions.h for more explanation */
702 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
704 int saved_errno = errno; /* from the preceeding chown call */
706 log_write(0, LOG_MAIN|LOG_PANIC,
707 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
708 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
709 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
711 /* I leave this here, commented, in case the "bug"(?) comes up again.
712 It is not an Exim bug, but we can provide a workaround.
718 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
720 if (buf.st_uid == owner && buf.st_gid == group) return 0;
721 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
723 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
731 /*************************************************
732 * Extract port from host address *
733 *************************************************/
735 /* Called to extract the port from the values given to -oMa and -oMi.
736 It also checks the syntax of the address, and terminates it before the
737 port data when a port is extracted.
740 address the address, with possible port on the end
742 Returns: the port, or zero if there isn't one
743 bombs out on a syntax error
747 check_port(uschar *address)
749 int port = host_address_extract_port(address);
750 if (string_is_ip_address(address, NULL) == 0)
751 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
757 /*************************************************
758 * Test/verify an address *
759 *************************************************/
761 /* This function is called by the -bv and -bt code. It extracts a working
762 address from a full RFC 822 address. This isn't really necessary per se, but it
763 has the effect of collapsing source routes.
767 flags flag bits for verify_address()
768 exit_value to be set for failures
774 test_address(uschar *s, int flags, int *exit_value)
776 int start, end, domain;
777 uschar *parse_error = NULL;
778 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
782 fprintf(stdout, "syntax error: %s\n", parse_error);
787 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
788 -1, -1, NULL, NULL, NULL);
789 if (rc == FAIL) *exit_value = 2;
790 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
796 /*************************************************
797 * Show supported features *
798 *************************************************/
801 show_db_version(FILE * f)
803 #ifdef DB_VERSION_STRING
806 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
807 fprintf(f, " Runtime: %s\n",
808 db_version(NULL, NULL, NULL));
811 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
813 #elif defined(BTREEVERSION) && defined(HASHVERSION)
815 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
817 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
820 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
821 fprintf(f, "Probably ndbm\n");
822 #elif defined(USE_TDB)
823 fprintf(f, "Using tdb\n");
826 fprintf(f, "Probably GDBM (native mode)\n");
828 fprintf(f, "Probably GDBM (compatibility mode)\n");
834 /* This function is called for -bV/--version and for -d to output the optional
835 features of the current Exim binary.
837 Arguments: a FILE for printing
842 show_whats_supported(FILE * fp)
844 DEBUG(D_any) {} else show_db_version(fp);
846 fprintf(fp, "Support for:");
847 #ifdef SUPPORT_CRYPTEQ
848 fprintf(fp, " crypteq");
851 fprintf(fp, " iconv()");
854 fprintf(fp, " IPv6");
856 #ifdef HAVE_SETCLASSRESOURCES
857 fprintf(fp, " use_setclassresources");
863 fprintf(fp, " Perl");
866 fprintf(fp, " Expand_dlfunc");
868 #ifdef USE_TCP_WRAPPERS
869 fprintf(fp, " TCPwrappers");
872 fprintf(fp, " GnuTLS");
875 fprintf(fp, " OpenSSL");
877 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
878 fprintf(fp, " translate_ip_address");
880 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
881 fprintf(fp, " move_frozen_messages");
883 #ifdef WITH_CONTENT_SCAN
884 fprintf(fp, " Content_Scanning");
887 fprintf(fp, " DANE");
890 fprintf(fp, " DKIM");
892 #ifndef DISABLE_DNSSEC
893 fprintf(fp, " DNSSEC");
895 #ifndef DISABLE_EVENT
896 fprintf(fp, " Event");
899 fprintf(fp, " I18N");
902 fprintf(fp, " OCSP");
904 #ifdef SUPPORT_PIPE_CONNECT
905 fprintf(fp, " PIPE_CONNECT");
908 fprintf(fp, " PRDR");
911 fprintf(fp, " PROXY");
914 fprintf(fp, " SOCKS");
921 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
923 #ifdef EXPERIMENTAL_LMDB
924 fprintf(fp, " Experimental_LMDB");
926 #ifdef EXPERIMENTAL_QUEUEFILE
927 fprintf(fp, " Experimental_QUEUEFILE");
929 #ifdef EXPERIMENTAL_SRS
930 fprintf(fp, " Experimental_SRS");
932 #ifdef EXPERIMENTAL_ARC
933 fprintf(fp, " Experimental_ARC");
935 #ifdef EXPERIMENTAL_BRIGHTMAIL
936 fprintf(fp, " Experimental_Brightmail");
938 #ifdef EXPERIMENTAL_DCC
939 fprintf(fp, " Experimental_DCC");
941 #ifdef EXPERIMENTAL_DMARC
942 fprintf(fp, " Experimental_DMARC");
944 #ifdef EXPERIMENTAL_DSN_INFO
945 fprintf(fp, " Experimental_DSN_info");
947 #ifdef EXPERIMENTAL_TLS_RESUME
948 fprintf(fp, " Experimental_TLS_resume");
952 fprintf(fp, "Lookups (built-in):");
953 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
954 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
956 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
959 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
960 fprintf(fp, " dbm dbmjz dbmnz");
962 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
963 fprintf(fp, " dnsdb");
965 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
966 fprintf(fp, " dsearch");
968 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
969 fprintf(fp, " ibase");
971 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
972 fprintf(fp, " json");
974 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
975 fprintf(fp, " ldap ldapdn ldapm");
977 #ifdef EXPERIMENTAL_LMDB
978 fprintf(fp, " lmdb");
980 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
981 fprintf(fp, " mysql");
983 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
984 fprintf(fp, " nis nis0");
986 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
987 fprintf(fp, " nisplus");
989 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
990 fprintf(fp, " oracle");
992 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
993 fprintf(fp, " passwd");
995 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
996 fprintf(fp, " pgsql");
998 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
999 fprintf(fp, " redis");
1001 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1002 fprintf(fp, " sqlite");
1004 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1005 fprintf(fp, " testdb");
1007 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1008 fprintf(fp, " whoson");
1012 auth_show_supported(fp);
1013 route_show_supported(fp);
1014 transport_show_supported(fp);
1016 #ifdef WITH_CONTENT_SCAN
1017 malware_show_supported(fp);
1020 if (fixed_never_users[0] > 0)
1023 fprintf(fp, "Fixed never_users: ");
1024 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1025 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
1026 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
1029 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
1031 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1033 /* Everything else is details which are only worth reporting when debugging.
1034 Perhaps the tls_version_report should move into this too. */
1037 /* clang defines __GNUC__ (at least, for me) so test for it first */
1038 #if defined(__clang__)
1039 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1040 #elif defined(__GNUC__)
1041 fprintf(fp, "Compiler: GCC [%s]\n",
1045 "? unknown version ?"
1049 fprintf(fp, "Compiler: <unknown>\n");
1052 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1053 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1054 __GLIBC__, __GLIBC_MINOR__);
1055 if (__GLIBC_PREREQ(2, 1))
1056 fprintf(fp, " Runtime: %s\n",
1057 gnu_get_libc_version());
1060 show_db_version(fp);
1063 tls_version_report(fp);
1066 utf8_version_report(fp);
1069 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1070 if (authi->version_report)
1071 (*authi->version_report)(fp);
1073 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1074 characters; unless it's an ancient version of PCRE in which case it
1076 #ifndef PCRE_PRERELEASE
1077 # define PCRE_PRERELEASE
1080 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1081 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1083 PCRE_MAJOR, PCRE_MINOR,
1084 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1087 #undef EXPAND_AND_QUOTE
1090 for (int i = 0; i < lookup_list_count; i++)
1091 if (lookup_list[i]->version_report)
1092 lookup_list[i]->version_report(fp);
1094 #ifdef WHITELIST_D_MACROS
1095 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1097 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1099 #ifdef TRUSTED_CONFIG_LIST
1100 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1102 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1109 /*************************************************
1110 * Show auxiliary information about Exim *
1111 *************************************************/
1114 show_exim_information(enum commandline_info request, FILE *stream)
1119 fprintf(stream, "Oops, something went wrong.\n");
1123 "The -bI: flag takes a string indicating which information to provide.\n"
1124 "If the string is not recognised, you'll get this help (on stderr).\n"
1126 " exim -bI:help this information\n"
1127 " exim -bI:dscp list of known dscp value keywords\n"
1128 " exim -bI:sieve list of supported sieve extensions\n"
1132 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1133 fprintf(stream, "%s\n", *pp);
1136 dscp_list_to_stream(stream);
1142 /*************************************************
1143 * Quote a local part *
1144 *************************************************/
1146 /* This function is used when a sender address or a From: or Sender: header
1147 line is being created from the caller's login, or from an authenticated_id. It
1148 applies appropriate quoting rules for a local part.
1150 Argument: the local part
1151 Returns: the local part, quoted if necessary
1155 local_part_quote(uschar *lpart)
1157 BOOL needs_quote = FALSE;
1160 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1162 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1163 (*t != '.' || t == lpart || t[1] == 0);
1166 if (!needs_quote) return lpart;
1168 g = string_catn(NULL, US"\"", 1);
1172 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1175 g = string_cat(g, lpart);
1178 g = string_catn(g, lpart, nq - lpart);
1179 g = string_catn(g, US"\\", 1);
1180 g = string_catn(g, nq, 1);
1184 g = string_catn(g, US"\"", 1);
1185 return string_from_gstring(g);
1191 /*************************************************
1192 * Load readline() functions *
1193 *************************************************/
1195 /* This function is called from testing executions that read data from stdin,
1196 but only when running as the calling user. Currently, only -be does this. The
1197 function loads the readline() function library and passes back the functions.
1198 On some systems, it needs the curses library, so load that too, but try without
1199 it if loading fails. All this functionality has to be requested at build time.
1202 fn_readline_ptr pointer to where to put the readline pointer
1203 fn_addhist_ptr pointer to where to put the addhistory function
1205 Returns: the dlopen handle or NULL on failure
1209 set_readline(char * (**fn_readline_ptr)(const char *),
1210 void (**fn_addhist_ptr)(const char *))
1213 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1215 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1216 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1218 if (dlhandle != NULL)
1220 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1221 * char * readline (const char *prompt);
1222 * void add_history (const char *string);
1224 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1225 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1229 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1238 /*************************************************
1239 * Get a line from stdin for testing things *
1240 *************************************************/
1242 /* This function is called when running tests that can take a number of lines
1243 of input (for example, -be and -bt). It handles continuations and trailing
1244 spaces. And prompting and a blank line output on eof. If readline() is in use,
1245 the arguments are non-NULL and provide the relevant functions.
1248 fn_readline readline function or NULL
1249 fn_addhist addhist function or NULL
1251 Returns: pointer to dynamic memory, or NULL at end of file
1255 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1259 if (!fn_readline) { printf("> "); fflush(stdout); }
1261 for (int i = 0;; i++)
1263 uschar buffer[1024];
1267 char *readline_line = NULL;
1270 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1271 if (*readline_line != 0 && fn_addhist) fn_addhist(readline_line);
1272 p = US readline_line;
1277 /* readline() not in use */
1280 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1284 /* Handle the line */
1286 ss = p + (int)Ustrlen(p);
1287 while (ss > p && isspace(ss[-1])) ss--;
1290 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1292 g = string_catn(g, p, ss - p);
1295 if (fn_readline) free(readline_line);
1298 /* g can only be NULL if ss==p */
1299 if (ss == p || g->s[g->ptr-1] != '\\')
1303 (void) string_from_gstring(g);
1306 if (!g) printf("\n");
1307 return string_from_gstring(g);
1312 /*************************************************
1313 * Output usage information for the program *
1314 *************************************************/
1316 /* This function is called when there are no recipients
1317 or a specific --help argument was added.
1320 progname information on what name we were called by
1322 Returns: DOES NOT RETURN
1326 exim_usage(uschar *progname)
1329 /* Handle specific program invocation variants */
1330 if (Ustrcmp(progname, US"-mailq") == 0)
1332 "mailq - list the contents of the mail queue\n\n"
1333 "For a list of options, see the Exim documentation.\n");
1335 /* Generic usage - we output this whatever happens */
1337 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1338 "not directly from a shell command line. Options and/or arguments control\n"
1339 "what it does when called. For a list of options, see the Exim documentation.\n");
1344 /*************************************************
1345 * Validate that the macros given are okay *
1346 *************************************************/
1348 /* Typically, Exim will drop privileges if macros are supplied. In some
1349 cases, we want to not do so.
1351 Arguments: opt_D_used - true if the commandline had a "-D" option
1352 Returns: true if trusted, false otherwise
1356 macros_trusted(BOOL opt_D_used)
1358 #ifdef WHITELIST_D_MACROS
1359 uschar *whitelisted, *end, *p, **whites;
1360 int white_count, i, n;
1362 BOOL prev_char_item, found;
1367 #ifndef WHITELIST_D_MACROS
1371 /* We only trust -D overrides for some invoking users:
1372 root, the exim run-time user, the optional config owner user.
1373 I don't know why config-owner would be needed, but since they can own the
1374 config files anyway, there's no security risk to letting them override -D. */
1375 if ( ! ((real_uid == root_uid)
1376 || (real_uid == exim_uid)
1377 #ifdef CONFIGURE_OWNER
1378 || (real_uid == config_uid)
1382 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1386 /* Get a list of macros which are whitelisted */
1387 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1388 prev_char_item = FALSE;
1390 for (p = whitelisted; *p != '\0'; ++p)
1392 if (*p == ':' || isspace(*p))
1397 prev_char_item = FALSE;
1400 if (!prev_char_item)
1401 prev_char_item = TRUE;
1408 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1409 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1414 if (i == white_count)
1416 while (*p != '\0' && p < end)
1422 /* The list of commandline macros should be very short.
1423 Accept the N*M complexity. */
1424 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1427 for (uschar ** w = whites; *w; ++w)
1428 if (Ustrcmp(*w, m->name) == 0)
1435 if (!m->replacement)
1437 if ((len = m->replen) == 0)
1439 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1440 0, PCRE_EOPT, NULL, 0);
1443 if (n != PCRE_ERROR_NOMATCH)
1444 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1448 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1454 /*************************************************
1455 * Expansion testing *
1456 *************************************************/
1458 /* Expand and print one item, doing macro-processing.
1461 item line for expansion
1465 expansion_test_line(uschar * line)
1470 Ustrncpy(big_buffer, line, big_buffer_size);
1471 big_buffer[big_buffer_size-1] = '\0';
1472 len = Ustrlen(big_buffer);
1474 (void) macros_expand(0, &len, &dummy_macexp);
1476 if (isupper(big_buffer[0]))
1478 if (macro_read_assignment(big_buffer))
1479 printf("Defined macro '%s'\n", mlast->name);
1482 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1483 else printf("Failed: %s\n", expand_string_message);
1488 /*************************************************
1489 * Entry point and high-level code *
1490 *************************************************/
1492 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1493 the appropriate action. All the necessary functions are present in the one
1494 binary. I originally thought one should split it up, but it turns out that so
1495 much of the apparatus is needed in each chunk that one might as well just have
1496 it all available all the time, which then makes the coding easier as well.
1499 argc count of entries in argv
1500 argv argument strings, with argv[0] being the program name
1502 Returns: EXIT_SUCCESS if terminated successfully
1503 EXIT_FAILURE otherwise, except when a message has been sent
1504 to the sender, and -oee was given
1508 main(int argc, char **cargv)
1510 uschar **argv = USS cargv;
1511 int arg_receive_timeout = -1;
1512 int arg_smtp_receive_timeout = -1;
1513 int arg_error_handling = error_handling;
1514 int filter_sfd = -1;
1515 int filter_ufd = -1;
1518 int list_queue_option = 0;
1520 int msg_action_arg = -1;
1521 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1522 int queue_only_reason = 0;
1524 int perl_start_option = 0;
1526 int recipients_arg = argc;
1527 int sender_address_domain = 0;
1528 int test_retry_arg = -1;
1529 int test_rewrite_arg = -1;
1530 gid_t original_egid;
1531 BOOL arg_queue_only = FALSE;
1532 BOOL bi_option = FALSE;
1533 BOOL checking = FALSE;
1534 BOOL count_queue = FALSE;
1535 BOOL expansion_test = FALSE;
1536 BOOL extract_recipients = FALSE;
1537 BOOL flag_G = FALSE;
1538 BOOL flag_n = FALSE;
1539 BOOL forced_delivery = FALSE;
1540 BOOL f_end_dot = FALSE;
1541 BOOL deliver_give_up = FALSE;
1542 BOOL list_queue = FALSE;
1543 BOOL list_options = FALSE;
1544 BOOL list_config = FALSE;
1545 BOOL local_queue_only;
1547 BOOL one_msg_action = FALSE;
1548 BOOL opt_D_used = FALSE;
1549 BOOL queue_only_set = FALSE;
1550 BOOL receiving_message = TRUE;
1551 BOOL sender_ident_set = FALSE;
1552 BOOL session_local_queue_only;
1554 BOOL removed_privilege = FALSE;
1555 BOOL usage_wanted = FALSE;
1556 BOOL verify_address_mode = FALSE;
1557 BOOL verify_as_sender = FALSE;
1558 BOOL version_printed = FALSE;
1559 uschar *alias_arg = NULL;
1560 uschar *called_as = US"";
1561 uschar *cmdline_syslog_name = NULL;
1562 uschar *start_queue_run_id = NULL;
1563 uschar *stop_queue_run_id = NULL;
1564 uschar *expansion_test_message = NULL;
1565 uschar *ftest_domain = NULL;
1566 uschar *ftest_localpart = NULL;
1567 uschar *ftest_prefix = NULL;
1568 uschar *ftest_suffix = NULL;
1569 uschar *log_oneline = NULL;
1570 uschar *malware_test_file = NULL;
1571 uschar *real_sender_address;
1572 uschar *originator_home = US"/";
1577 struct stat statbuf;
1578 pid_t passed_qr_pid = (pid_t)0;
1579 int passed_qr_pipe = -1;
1580 gid_t group_list[EXIM_GROUPLIST_SIZE];
1582 /* For the -bI: flag */
1583 enum commandline_info info_flag = CMDINFO_NONE;
1584 BOOL info_stdout = FALSE;
1586 /* Possible options for -R and -S */
1588 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1590 /* Need to define this in case we need to change the environment in order
1591 to get rid of a bogus time zone. We have to make it char rather than uschar
1592 because some OS define it in /usr/include/unistd.h. */
1594 extern char **environ;
1596 /* If the Exim user and/or group and/or the configuration file owner/group were
1597 defined by ref:name at build time, we must now find the actual uid/gid values.
1598 This is a feature to make the lives of binary distributors easier. */
1600 #ifdef EXIM_USERNAME
1601 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1604 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1606 /* If ref:name uses a number as the name, route_finduser() returns
1607 TRUE with exim_uid set and pw coerced to NULL. */
1609 exim_gid = pw->pw_gid;
1610 #ifndef EXIM_GROUPNAME
1613 "exim: ref:name should specify a usercode, not a group.\n"
1614 "exim: can't let you get away with it unless you also specify a group.\n");
1618 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1621 #ifdef EXIM_GROUPNAME
1622 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1623 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1626 #ifdef CONFIGURE_OWNERNAME
1627 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1628 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1629 CONFIGURE_OWNERNAME);
1632 /* We default the system_filter_user to be the Exim run-time user, as a
1633 sane non-root value. */
1634 system_filter_uid = exim_uid;
1636 #ifdef CONFIGURE_GROUPNAME
1637 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1638 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1639 CONFIGURE_GROUPNAME);
1642 /* In the Cygwin environment, some initialization used to need doing.
1643 It was fudged in by means of this macro; now no longer but we'll leave
1644 it in case of others. */
1650 /* Check a field which is patched when we are running Exim within its
1651 testing harness; do a fast initial check, and then the whole thing. */
1653 f.running_in_test_harness =
1654 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1655 if (f.running_in_test_harness)
1658 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1659 at the start of a program; however, it seems that some environments do not
1660 follow this. A "strange" locale can affect the formatting of timestamps, so we
1663 setlocale(LC_ALL, "C");
1665 /* Set up the default handler for timing using alarm(). */
1667 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1669 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1670 because store_malloc writes a log entry on failure. */
1672 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1673 exim_fail("exim: failed to get store for log buffer\n");
1675 /* Initialize the default log options. */
1677 bits_set(log_selector, log_selector_size, log_default);
1679 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1680 NULL when the daemon is run and the file is closed. We have to use this
1681 indirection, because some systems don't allow writing to the variable "stderr".
1684 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1686 /* Arrange for the PCRE regex library to use our store functions. Note that
1687 the normal calls are actually macros that add additional arguments for
1688 debugging purposes so we have to assign specially constructed functions here.
1689 The default is to use store in the stacking pool, but this is overridden in the
1690 regex_must_compile() function. */
1692 pcre_malloc = function_store_get;
1693 pcre_free = function_dummy_free;
1695 /* Ensure there is a big buffer for temporary use in several places. It is put
1696 in malloc store so that it can be freed for enlargement if necessary. */
1698 big_buffer = store_malloc(big_buffer_size);
1700 /* Set up the handler for the data request signal, and set the initial
1701 descriptive text. */
1703 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1704 set_process_info("initializing");
1705 os_restarting_signal(SIGUSR1, usr1_handler);
1707 /* If running in a dockerized environment, the TERM signal is only
1708 delegated to the PID 1 if we request it by setting an signal handler */
1709 if (getpid() == 1) signal(SIGTERM, term_handler);
1711 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1712 in the daemon code. For the rest of Exim's uses, we ignore it. */
1714 signal(SIGHUP, SIG_IGN);
1716 /* We don't want to die on pipe errors as the code is written to handle
1717 the write error instead. */
1719 signal(SIGPIPE, SIG_IGN);
1721 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1722 set to SIG_IGN. This causes subprocesses that complete before the parent
1723 process waits for them not to hang around, so when Exim calls wait(), nothing
1724 is there. The wait() code has been made robust against this, but let's ensure
1725 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1726 ending status. We use sigaction rather than plain signal() on those OS where
1727 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1728 problem on AIX with this.) */
1732 struct sigaction act;
1733 act.sa_handler = SIG_DFL;
1734 sigemptyset(&(act.sa_mask));
1736 sigaction(SIGCHLD, &act, NULL);
1739 signal(SIGCHLD, SIG_DFL);
1742 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1747 /* Set up the version number. Set up the leading 'E' for the external form of
1748 message ids, set the pointer to the internal form, and initialize it to
1749 indicate no message being processed. */
1752 message_id_option[0] = '-';
1753 message_id_external = message_id_option + 1;
1754 message_id_external[0] = 'E';
1755 message_id = message_id_external + 1;
1758 /* Set the umask to zero so that any files Exim creates using open() are
1759 created with the modes that it specifies. NOTE: Files created with fopen() have
1760 a problem, which was not recognized till rather late (February 2006). With this
1761 umask, such files will be world writeable. (They are all content scanning files
1762 in the spool directory, which isn't world-accessible, so this is not a
1763 disaster, but it's untidy.) I don't want to change this overall setting,
1764 however, because it will interact badly with the open() calls. Instead, there's
1765 now a function called modefopen() that fiddles with the umask while calling
1770 /* Precompile the regular expression for matching a message id. Keep this in
1771 step with the code that generates ids in the accept.c module. We need to do
1772 this here, because the -M options check their arguments for syntactic validity
1773 using mac_ismsgid, which uses this. */
1776 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1778 /* Precompile the regular expression that is used for matching an SMTP error
1779 code, possibly extended, at the start of an error message. Note that the
1780 terminating whitespace character is included. */
1783 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1786 #ifdef WHITELIST_D_MACROS
1787 /* Precompile the regular expression used to filter the content of macros
1788 given to -D for permissibility. */
1790 regex_whitelisted_macro =
1791 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1794 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1796 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1797 this seems to be a generally accepted convention, since one finds symbolic
1798 links called "mailq" in standard OS configurations. */
1800 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1801 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1804 receiving_message = FALSE;
1805 called_as = US"-mailq";
1808 /* If the program is called as "rmail" treat it as equivalent to
1809 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1810 i.e. preventing a single dot on a line from terminating the message, and
1811 returning with zero return code, even in cases of error (provided an error
1812 message has been sent). */
1814 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1815 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1818 called_as = US"-rmail";
1819 errors_sender_rc = EXIT_SUCCESS;
1822 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1823 this is a smail convention. */
1825 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1826 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1828 smtp_input = smtp_batched_input = TRUE;
1829 called_as = US"-rsmtp";
1832 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1833 this is a smail convention. */
1835 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1836 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1839 receiving_message = FALSE;
1840 called_as = US"-runq";
1843 /* If the program is called as "newaliases" treat it as equivalent to
1844 "exim -bi"; this is a sendmail convention. */
1846 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1847 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1850 receiving_message = FALSE;
1851 called_as = US"-newaliases";
1854 /* Save the original effective uid for a couple of uses later. It should
1855 normally be root, but in some esoteric environments it may not be. */
1857 original_euid = geteuid();
1858 original_egid = getegid();
1860 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1861 to be the same as the real ones. This makes a difference only if Exim is setuid
1862 (or setgid) to something other than root, which could be the case in some
1863 special configurations. */
1865 real_uid = getuid();
1866 real_gid = getgid();
1868 if (real_uid == root_uid)
1870 if ((rv = setgid(real_gid)))
1871 exim_fail("exim: setgid(%ld) failed: %s\n",
1872 (long int)real_gid, strerror(errno));
1873 if ((rv = setuid(real_uid)))
1874 exim_fail("exim: setuid(%ld) failed: %s\n",
1875 (long int)real_uid, strerror(errno));
1878 /* If neither the original real uid nor the original euid was root, Exim is
1879 running in an unprivileged state. */
1881 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1883 /* Scan the program's arguments. Some can be dealt with right away; others are
1884 simply recorded for checking and handling afterwards. Do a high-level switch
1885 on the second character (the one after '-'), to save some effort. */
1887 for (i = 1; i < argc; i++)
1889 BOOL badarg = FALSE;
1890 uschar *arg = argv[i];
1894 /* An argument not starting with '-' is the start of a recipients list;
1895 break out of the options-scanning loop. */
1903 /* An option consisting of -- terminates the options */
1905 if (Ustrcmp(arg, "--") == 0)
1907 recipients_arg = i + 1;
1911 /* Handle flagged options */
1913 switchchar = arg[1];
1916 /* Make all -ex options synonymous with -oex arguments, since that
1917 is assumed by various callers. Also make -qR options synonymous with -R
1918 options, as that seems to be required as well. Allow for -qqR too, and
1919 the same for -S options. */
1921 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1922 Ustrncmp(arg+1, "qR", 2) == 0 ||
1923 Ustrncmp(arg+1, "qS", 2) == 0)
1925 switchchar = arg[2];
1928 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1930 switchchar = arg[3];
1932 f.queue_2stage = TRUE;
1935 /* Make -r synonymous with -f, since it is a documented alias */
1937 else if (arg[1] == 'r') switchchar = 'f';
1939 /* Make -ov synonymous with -v */
1941 else if (Ustrcmp(arg, "-ov") == 0)
1947 /* deal with --option_aliases */
1948 else if (switchchar == '-')
1950 if (Ustrcmp(argrest, "help") == 0)
1952 usage_wanted = TRUE;
1955 else if (Ustrcmp(argrest, "version") == 0)
1962 /* High-level switch on active initial letter */
1967 /* sendmail uses -Ac and -Am to control which .cf file is used;
1970 if (*argrest == '\0') { badarg = TRUE; break; }
1973 BOOL ignore = FALSE;
1978 if (*(argrest + 1) == '\0')
1982 if (!ignore) { badarg = TRUE; break; }
1986 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1987 so has no need of it. */
1990 if (*argrest == 0) i++; /* Skip over the type */
1995 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1997 /* -bd: Run in daemon mode, awaiting SMTP connections.
1998 -bdf: Ditto, but in the foreground.
2001 if (*argrest == 'd')
2003 f.daemon_listen = TRUE;
2004 if (*(++argrest) == 'f') f.background_daemon = FALSE;
2005 else if (*argrest != 0) { badarg = TRUE; break; }
2008 /* -be: Run in expansion test mode
2009 -bem: Ditto, but read a message from a file first
2012 else if (*argrest == 'e')
2014 expansion_test = checking = TRUE;
2015 if (argrest[1] == 'm')
2017 if (++i >= argc) { badarg = TRUE; break; }
2018 expansion_test_message = argv[i];
2021 if (argrest[1] != 0) { badarg = TRUE; break; }
2024 /* -bF: Run system filter test */
2026 else if (*argrest == 'F')
2028 filter_test |= checking = FTEST_SYSTEM;
2029 if (*(++argrest) != 0) { badarg = TRUE; break; }
2030 if (++i < argc) filter_test_sfile = argv[i]; else
2031 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2034 /* -bf: Run user filter test
2035 -bfd: Set domain for filter testing
2036 -bfl: Set local part for filter testing
2037 -bfp: Set prefix for filter testing
2038 -bfs: Set suffix for filter testing
2041 else if (*argrest == 'f')
2043 if (*(++argrest) == 0)
2045 filter_test |= checking = FTEST_USER;
2046 if (++i < argc) filter_test_ufile = argv[i]; else
2047 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2052 exim_fail("exim: string expected after %s\n", arg);
2053 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2054 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2055 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2056 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2057 else { badarg = TRUE; break; }
2061 /* -bh: Host checking - an IP address must follow. */
2063 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2065 if (++i >= argc) { badarg = TRUE; break; }
2066 sender_host_address = argv[i];
2067 host_checking = checking = f.log_testing_mode = TRUE;
2068 f.host_checking_callout = argrest[1] == 'c';
2069 message_logs = FALSE;
2072 /* -bi: This option is used by sendmail to initialize *the* alias file,
2073 though it has the -oA option to specify a different file. Exim has no
2074 concept of *the* alias file, but since Sun's YP make script calls
2075 sendmail this way, some support must be provided. */
2077 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2079 /* -bI: provide information, of the type to follow after a colon.
2080 This is an Exim flag. */
2082 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2084 uschar *p = &argrest[2];
2085 info_flag = CMDINFO_HELP;
2088 if (strcmpic(p, CUS"sieve") == 0)
2090 info_flag = CMDINFO_SIEVE;
2093 else if (strcmpic(p, CUS"dscp") == 0)
2095 info_flag = CMDINFO_DSCP;
2098 else if (strcmpic(p, CUS"help") == 0)
2105 /* -bm: Accept and deliver message - the default option. Reinstate
2106 receiving_message, which got turned off for all -b options. */
2108 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2110 /* -bmalware: test the filename given for malware */
2112 else if (Ustrcmp(argrest, "malware") == 0)
2114 if (++i >= argc) { badarg = TRUE; break; }
2116 malware_test_file = argv[i];
2119 /* -bnq: For locally originating messages, do not qualify unqualified
2120 addresses. In the envelope, this causes errors; in header lines they
2123 else if (Ustrcmp(argrest, "nq") == 0)
2125 f.allow_unqualified_sender = FALSE;
2126 f.allow_unqualified_recipient = FALSE;
2129 /* -bpxx: List the contents of the mail queue, in various forms. If
2130 the option is -bpc, just a queue count is needed. Otherwise, if the
2131 first letter after p is r, then order is random. */
2133 else if (*argrest == 'p')
2135 if (*(++argrest) == 'c')
2138 if (*(++argrest) != 0) badarg = TRUE;
2142 if (*argrest == 'r')
2144 list_queue_option = 8;
2147 else list_queue_option = 0;
2151 /* -bp: List the contents of the mail queue, top-level only */
2153 if (*argrest == 0) {}
2155 /* -bpu: List the contents of the mail queue, top-level undelivered */
2157 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2159 /* -bpa: List the contents of the mail queue, including all delivered */
2161 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2163 /* Unknown after -bp[r] */
2173 /* -bP: List the configuration variables given as the address list.
2174 Force -v, so configuration errors get displayed. */
2176 else if (Ustrcmp(argrest, "P") == 0)
2178 /* -bP config: we need to setup here, because later,
2179 * when list_options is checked, the config is read already */
2180 if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2183 readconf_save_config(version_string);
2187 list_options = TRUE;
2188 debug_selector |= D_v;
2189 debug_file = stderr;
2193 /* -brt: Test retry configuration lookup */
2195 else if (Ustrcmp(argrest, "rt") == 0)
2198 test_retry_arg = i + 1;
2202 /* -brw: Test rewrite configuration */
2204 else if (Ustrcmp(argrest, "rw") == 0)
2207 test_rewrite_arg = i + 1;
2211 /* -bS: Read SMTP commands on standard input, but produce no replies -
2212 all errors are reported by sending messages. */
2214 else if (Ustrcmp(argrest, "S") == 0)
2215 smtp_input = smtp_batched_input = receiving_message = TRUE;
2217 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2218 on standard output. */
2220 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2222 /* -bt: address testing mode */
2224 else if (Ustrcmp(argrest, "t") == 0)
2225 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2227 /* -bv: verify addresses */
2229 else if (Ustrcmp(argrest, "v") == 0)
2230 verify_address_mode = checking = f.log_testing_mode = TRUE;
2232 /* -bvs: verify sender addresses */
2234 else if (Ustrcmp(argrest, "vs") == 0)
2236 verify_address_mode = checking = f.log_testing_mode = TRUE;
2237 verify_as_sender = TRUE;
2240 /* -bV: Print version string and support details */
2242 else if (Ustrcmp(argrest, "V") == 0)
2244 printf("Exim version %s #%s built %s\n", version_string,
2245 version_cnumber, version_date);
2246 printf("%s\n", CS version_copyright);
2247 version_printed = TRUE;
2248 show_whats_supported(stdout);
2249 f.log_testing_mode = TRUE;
2252 /* -bw: inetd wait mode, accept a listening socket as stdin */
2254 else if (*argrest == 'w')
2256 f.inetd_wait_mode = TRUE;
2257 f.background_daemon = FALSE;
2258 f.daemon_listen = TRUE;
2259 if (*(++argrest) != '\0')
2260 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2261 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2268 /* -C: change configuration file list; ignore if it isn't really
2269 a change! Enforce a prefix check if required. */
2274 if(++i < argc) argrest = argv[i]; else
2275 { badarg = TRUE; break; }
2277 if (Ustrcmp(config_main_filelist, argrest) != 0)
2279 #ifdef ALT_CONFIG_PREFIX
2281 int len = Ustrlen(ALT_CONFIG_PREFIX);
2282 const uschar *list = argrest;
2284 while((filename = string_nextinlist(&list, &sep, big_buffer,
2285 big_buffer_size)) != NULL)
2287 if ((Ustrlen(filename) < len ||
2288 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2289 Ustrstr(filename, "/../") != NULL) &&
2290 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2291 exim_fail("-C Permission denied\n");
2294 if (real_uid != root_uid)
2296 #ifdef TRUSTED_CONFIG_LIST
2298 if (real_uid != exim_uid
2299 #ifdef CONFIGURE_OWNER
2300 && real_uid != config_uid
2303 f.trusted_config = FALSE;
2306 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2309 struct stat statbuf;
2311 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2312 (statbuf.st_uid != root_uid /* owner not root */
2313 #ifdef CONFIGURE_OWNER
2314 && statbuf.st_uid != config_uid /* owner not the special one */
2317 (statbuf.st_gid != root_gid /* group not root */
2318 #ifdef CONFIGURE_GROUP
2319 && statbuf.st_gid != config_gid /* group not the special one */
2321 && (statbuf.st_mode & 020) != 0 /* group writeable */
2323 (statbuf.st_mode & 2) != 0) /* world writeable */
2325 f.trusted_config = FALSE;
2330 /* Well, the trust list at least is up to scratch... */
2331 rmark reset_point = store_mark();
2332 uschar *trusted_configs[32];
2336 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2338 uschar *start = big_buffer, *nl;
2339 while (*start && isspace(*start))
2343 nl = Ustrchr(start, '\n');
2346 trusted_configs[nr_configs++] = string_copy(start);
2347 if (nr_configs == 32)
2355 const uschar *list = argrest;
2357 while (f.trusted_config && (filename = string_nextinlist(&list,
2358 &sep, big_buffer, big_buffer_size)) != NULL)
2360 for (i=0; i < nr_configs; i++)
2361 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2363 if (i == nr_configs)
2365 f.trusted_config = FALSE;
2370 else /* No valid prefixes found in trust_list file. */
2371 f.trusted_config = FALSE;
2372 store_reset(reset_point);
2375 else /* Could not open trust_list file. */
2376 f.trusted_config = FALSE;
2379 /* Not root; don't trust config */
2380 f.trusted_config = FALSE;
2384 config_main_filelist = argrest;
2385 f.config_changed = TRUE;
2390 /* -D: set up a macro definition */
2393 #ifdef DISABLE_D_OPTION
2394 exim_fail("exim: -D is not available in this Exim binary\n");
2400 uschar *s = argrest;
2403 while (isspace(*s)) s++;
2405 if (*s < 'A' || *s > 'Z')
2406 exim_fail("exim: macro name set by -D must start with "
2407 "an upper case letter\n");
2409 while (isalnum(*s) || *s == '_')
2411 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2415 if (ptr == 0) { badarg = TRUE; break; }
2416 while (isspace(*s)) s++;
2419 if (*s++ != '=') { badarg = TRUE; break; }
2420 while (isspace(*s)) s++;
2423 for (m = macros_user; m; m = m->next)
2424 if (Ustrcmp(m->name, name) == 0)
2425 exim_fail("exim: duplicated -D in command line\n");
2427 m = macro_create(name, s, TRUE);
2429 if (clmacro_count >= MAX_CLMACROS)
2430 exim_fail("exim: too many -D options on command line\n");
2431 clmacros[clmacro_count++] =
2432 string_sprintf("-D%s=%s", m->name, m->replacement);
2437 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2438 The latter is now a no-op, retained for compatibility only. If -dd is used,
2439 debugging subprocesses of the daemon is disabled. */
2442 if (Ustrcmp(argrest, "ropcr") == 0)
2444 /* drop_cr = TRUE; */
2447 /* Use an intermediate variable so that we don't set debugging while
2448 decoding the debugging bits. */
2452 unsigned int selector = D_default;
2455 if (*argrest == 'd')
2457 f.debug_daemon = TRUE;
2461 decode_bits(&selector, 1, debug_notall, argrest,
2462 debug_options, debug_options_count, US"debug", 0);
2463 debug_selector = selector;
2468 /* -E: This is a local error message. This option is not intended for
2469 external use at all, but is not restricted to trusted callers because it
2470 does no harm (just suppresses certain error messages) and if Exim is run
2471 not setuid root it won't always be trusted when it generates error
2472 messages using this option. If there is a message id following -E, point
2473 message_reference at it, for logging. */
2476 f.local_error_message = TRUE;
2477 if (mac_ismsgid(argrest)) message_reference = argrest;
2481 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2482 option, so it looks as if historically the -oex options are also callable
2483 without the leading -o. So we have to accept them. Before the switch,
2484 anything starting -oe has been converted to -e. Exim does not support all
2485 of the sendmail error options. */
2488 if (Ustrcmp(argrest, "e") == 0)
2490 arg_error_handling = ERRORS_SENDER;
2491 errors_sender_rc = EXIT_SUCCESS;
2493 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2494 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2495 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2496 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2501 /* -F: Set sender's full name, used instead of the gecos entry from
2502 the password file. Since users can usually alter their gecos entries,
2503 there's no security involved in using this instead. The data can follow
2504 the -F or be in the next argument. */
2509 if(++i < argc) argrest = argv[i]; else
2510 { badarg = TRUE; break; }
2512 originator_name = argrest;
2513 f.sender_name_forced = TRUE;
2517 /* -f: Set sender's address - this value is only actually used if Exim is
2518 run by a trusted user, or if untrusted_set_sender is set and matches the
2519 address, except that the null address can always be set by any user. The
2520 test for this happens later, when the value given here is ignored when not
2521 permitted. For an untrusted user, the actual sender is still put in Sender:
2522 if it doesn't match the From: header (unless no_local_from_check is set).
2523 The data can follow the -f or be in the next argument. The -r switch is an
2524 obsolete form of -f but since there appear to be programs out there that
2525 use anything that sendmail has ever supported, better accept it - the
2526 synonymizing is done before the switch above.
2528 At this stage, we must allow domain literal addresses, because we don't
2529 know what the setting of allow_domain_literals is yet. Ditto for trailing
2530 dots and strip_trailing_dot. */
2534 int dummy_start, dummy_end;
2538 if (i+1 < argc) argrest = argv[++i]; else
2539 { badarg = TRUE; break; }
2542 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2545 uschar *temp = argrest + Ustrlen(argrest) - 1;
2546 while (temp >= argrest && isspace(*temp)) temp--;
2547 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2548 allow_domain_literals = TRUE;
2549 strip_trailing_dot = TRUE;
2551 allow_utf8_domains = TRUE;
2553 sender_address = parse_extract_address(argrest, &errmess,
2554 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2555 sender_address = string_copy_taint(sender_address, TRUE);
2557 message_smtputf8 = string_is_utf8(sender_address);
2558 allow_utf8_domains = FALSE;
2560 allow_domain_literals = FALSE;
2561 strip_trailing_dot = FALSE;
2562 if (!sender_address)
2563 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2565 f.sender_address_forced = TRUE;
2569 /* -G: sendmail invocation to specify that it's a gateway submission and
2570 sendmail may complain about problems instead of fixing them.
2571 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2572 not at this time complain about problems. */
2578 /* -h: Set the hop count for an incoming message. Exim does not currently
2579 support this; it always computes it by counting the Received: headers.
2580 To put it in will require a change to the spool header file format. */
2585 if(++i < argc) argrest = argv[i]; else
2586 { badarg = TRUE; break; }
2588 if (!isdigit(*argrest)) badarg = TRUE;
2592 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2593 not to be documented for sendmail but mailx (at least) uses it) */
2596 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2600 /* -L: set the identifier used for syslog; equivalent to setting
2601 syslog_processname in the config file, but needs to be an admin option. */
2604 if (*argrest == '\0')
2606 if(++i < argc) argrest = argv[i]; else
2607 { badarg = TRUE; break; }
2609 if ((sz = Ustrlen(argrest)) > 32)
2610 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2612 exim_fail("exim: the -L syslog name is too short\n");
2613 cmdline_syslog_name = argrest;
2617 receiving_message = FALSE;
2619 /* -MC: continue delivery of another message via an existing open
2620 file descriptor. This option is used for an internal call by the
2621 smtp transport when there is a pending message waiting to go to an
2622 address to which it has got a connection. Five subsequent arguments are
2623 required: transport name, host name, IP address, sequence number, and
2624 message_id. Transports may decline to create new processes if the sequence
2625 number gets too big. The channel is stdin. This (-MC) must be the last
2626 argument. There's a subsequent check that the real-uid is privileged.
2628 If we are running in the test harness. delay for a bit, to let the process
2629 that set this one up complete. This makes for repeatability of the logging,
2632 if (Ustrcmp(argrest, "C") == 0)
2634 union sockaddr_46 interface_sock;
2635 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2638 exim_fail("exim: too many or too few arguments after -MC\n");
2640 if (msg_action_arg >= 0)
2641 exim_fail("exim: incompatible arguments\n");
2643 continue_transport = argv[++i];
2644 continue_hostname = argv[++i];
2645 continue_host_address = argv[++i];
2646 continue_sequence = Uatoi(argv[++i]);
2647 msg_action = MSG_DELIVER;
2648 msg_action_arg = ++i;
2649 forced_delivery = TRUE;
2650 queue_run_pid = passed_qr_pid;
2651 queue_run_pipe = passed_qr_pipe;
2653 if (!mac_ismsgid(argv[i]))
2654 exim_fail("exim: malformed message id %s after -MC option\n",
2657 /* Set up $sending_ip_address and $sending_port, unless proxied */
2659 if (!continue_proxy_cipher)
2660 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2662 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2665 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2668 if (f.running_in_test_harness) millisleep(500);
2672 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2676 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2677 precedes -MC (see above). The flag indicates that the host to which
2678 Exim is connected has accepted an AUTH sequence. */
2680 case 'A': f.smtp_authenticated = TRUE; break;
2682 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2683 that exim is connected to supports the esmtp extension DSN */
2685 case 'D': smtp_peer_options |= OPTION_DSN; break;
2687 /* -MCG: set the queue name, to a non-default value */
2689 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2693 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2695 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2697 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2698 it preceded -MC (see above) */
2700 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2702 /* -MCQ: pass on the pid of the queue-running process that started
2703 this chain of deliveries and the fd of its synchronizing pipe; this
2704 is useful only when it precedes -MC (see above) */
2706 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2708 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2712 /* -MCS: set the smtp_use_size flag; this is useful only when it
2713 precedes -MC (see above) */
2715 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2718 /* -MCt: similar to -MCT below but the connection is still open
2719 via a proxy process which handles the TLS context and coding.
2720 Require three arguments for the proxied local address and port,
2721 and the TLS cipher. */
2723 case 't': if (++i < argc) sending_ip_address = argv[i];
2725 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2727 if (++i < argc) continue_proxy_cipher = argv[i];
2731 /* -MCT: set the tls_offered flag; this is useful only when it
2732 precedes -MC (see above). The flag indicates that the host to which
2733 Exim is connected has offered TLS support. */
2735 case 'T': smtp_peer_options |= OPTION_TLS; break;
2738 default: badarg = TRUE; break;
2743 /* -M[x]: various operations on the following list of message ids:
2744 -M deliver the messages, ignoring next retry times and thawing
2745 -Mc deliver the messages, checking next retry times, no thawing
2746 -Mf freeze the messages
2747 -Mg give up on the messages
2748 -Mt thaw the messages
2749 -Mrm remove the messages
2750 In the above cases, this must be the last option. There are also the
2751 following options which are followed by a single message id, and which
2752 act on that message. Some of them use the "recipient" addresses as well.
2753 -Mar add recipient(s)
2754 -Mmad mark all recipients delivered
2755 -Mmd mark recipients(s) delivered
2757 -Mset load a message for use with -be
2759 -Mvc show copy (of whole message, in RFC 2822 format)
2764 else if (*argrest == 0)
2766 msg_action = MSG_DELIVER;
2767 forced_delivery = f.deliver_force_thaw = TRUE;
2769 else if (Ustrcmp(argrest, "ar") == 0)
2771 msg_action = MSG_ADD_RECIPIENT;
2772 one_msg_action = TRUE;
2774 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2775 else if (Ustrcmp(argrest, "es") == 0)
2777 msg_action = MSG_EDIT_SENDER;
2778 one_msg_action = TRUE;
2780 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2781 else if (Ustrcmp(argrest, "g") == 0)
2783 msg_action = MSG_DELIVER;
2784 deliver_give_up = TRUE;
2786 else if (Ustrcmp(argrest, "mad") == 0)
2788 msg_action = MSG_MARK_ALL_DELIVERED;
2790 else if (Ustrcmp(argrest, "md") == 0)
2792 msg_action = MSG_MARK_DELIVERED;
2793 one_msg_action = TRUE;
2795 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2796 else if (Ustrcmp(argrest, "set") == 0)
2798 msg_action = MSG_LOAD;
2799 one_msg_action = TRUE;
2801 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2802 else if (Ustrcmp(argrest, "vb") == 0)
2804 msg_action = MSG_SHOW_BODY;
2805 one_msg_action = TRUE;
2807 else if (Ustrcmp(argrest, "vc") == 0)
2809 msg_action = MSG_SHOW_COPY;
2810 one_msg_action = TRUE;
2812 else if (Ustrcmp(argrest, "vh") == 0)
2814 msg_action = MSG_SHOW_HEADER;
2815 one_msg_action = TRUE;
2817 else if (Ustrcmp(argrest, "vl") == 0)
2819 msg_action = MSG_SHOW_LOG;
2820 one_msg_action = TRUE;
2822 else { badarg = TRUE; break; }
2824 /* All the -Mxx options require at least one message id. */
2826 msg_action_arg = i + 1;
2827 if (msg_action_arg >= argc)
2828 exim_fail("exim: no message ids given after %s option\n", arg);
2830 /* Some require only message ids to follow */
2832 if (!one_msg_action)
2834 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2835 exim_fail("exim: malformed message id %s after %s option\n",
2837 goto END_ARG; /* Remaining args are ids */
2840 /* Others require only one message id, possibly followed by addresses,
2841 which will be handled as normal arguments. */
2845 if (!mac_ismsgid(argv[msg_action_arg]))
2846 exim_fail("exim: malformed message id %s after %s option\n",
2847 argv[msg_action_arg], arg);
2853 /* Some programs seem to call the -om option without the leading o;
2854 for sendmail it askes for "me too". Exim always does this. */
2857 if (*argrest != 0) badarg = TRUE;
2861 /* -N: don't do delivery - a debugging option that stops transports doing
2862 their thing. It implies debugging at the D_v level. */
2867 f.dont_deliver = TRUE;
2868 debug_selector |= D_v;
2869 debug_file = stderr;
2875 /* -n: This means "don't alias" in sendmail, apparently.
2876 For normal invocations, it has no effect.
2877 It may affect some other options. */
2883 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2884 option to the specified value. This form uses long names. We need to handle
2885 -O option=value and -Ooption=value. */
2891 exim_fail("exim: string expected after -O\n");
2897 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2900 if (*argrest == 'A')
2902 alias_arg = argrest + 1;
2903 if (alias_arg[0] == 0)
2905 if (i+1 < argc) alias_arg = argv[++i]; else
2906 exim_fail("exim: string expected after -oA\n");
2910 /* -oB: Set a connection message max value for remote deliveries */
2912 else if (*argrest == 'B')
2914 uschar *p = argrest + 1;
2917 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2919 connection_max_messages = 1;
2927 exim_fail("exim: number expected after -oB\n");
2928 connection_max_messages = Uatoi(p);
2932 /* -odb: background delivery */
2934 else if (Ustrcmp(argrest, "db") == 0)
2936 f.synchronous_delivery = FALSE;
2937 arg_queue_only = FALSE;
2938 queue_only_set = TRUE;
2941 /* -odf: foreground delivery (smail-compatible option); same effect as
2942 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2945 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2947 f.synchronous_delivery = TRUE;
2948 arg_queue_only = FALSE;
2949 queue_only_set = TRUE;
2952 /* -odq: queue only */
2954 else if (Ustrcmp(argrest, "dq") == 0)
2956 f.synchronous_delivery = FALSE;
2957 arg_queue_only = TRUE;
2958 queue_only_set = TRUE;
2961 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2962 but no remote delivery */
2964 else if (Ustrcmp(argrest, "dqs") == 0)
2966 f.queue_smtp = TRUE;
2967 arg_queue_only = FALSE;
2968 queue_only_set = TRUE;
2971 /* -oex: Sendmail error flags. As these are also accepted without the
2972 leading -o prefix, for compatibility with vacation and other callers,
2973 they are handled with -e above. */
2975 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2976 -oitrue: Another sendmail syntax for the same */
2978 else if (Ustrcmp(argrest, "i") == 0 ||
2979 Ustrcmp(argrest, "itrue") == 0)
2982 /* -oM*: Set various characteristics for an incoming message; actually
2983 acted on for trusted callers only. */
2985 else if (*argrest == 'M')
2988 exim_fail("exim: data expected after -o%s\n", argrest);
2990 /* -oMa: Set sender host address */
2992 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2994 /* -oMaa: Set authenticator name */
2996 else if (Ustrcmp(argrest, "Maa") == 0)
2997 sender_host_authenticated = argv[++i];
2999 /* -oMas: setting authenticated sender */
3001 else if (Ustrcmp(argrest, "Mas") == 0)
3002 authenticated_sender = string_copy_taint(argv[++i], TRUE);
3004 /* -oMai: setting authenticated id */
3006 else if (Ustrcmp(argrest, "Mai") == 0)
3007 authenticated_id = string_copy_taint(argv[++i], TRUE);
3009 /* -oMi: Set incoming interface address */
3011 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3013 /* -oMm: Message reference */
3015 else if (Ustrcmp(argrest, "Mm") == 0)
3017 if (!mac_ismsgid(argv[i+1]))
3018 exim_fail("-oMm must be a valid message ID\n");
3019 if (!f.trusted_config)
3020 exim_fail("-oMm must be called by a trusted user/config\n");
3021 message_reference = argv[++i];
3024 /* -oMr: Received protocol */
3026 else if (Ustrcmp(argrest, "Mr") == 0)
3028 if (received_protocol)
3029 exim_fail("received_protocol is set already\n");
3031 received_protocol = argv[++i];
3033 /* -oMs: Set sender host name */
3035 else if (Ustrcmp(argrest, "Ms") == 0)
3036 sender_host_name = string_copy_taint(argv[++i], TRUE);
3038 /* -oMt: Set sender ident */
3040 else if (Ustrcmp(argrest, "Mt") == 0)
3042 sender_ident_set = TRUE;
3043 sender_ident = argv[++i];
3046 /* Else a bad argument */
3055 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3056 seem to call this as -m (undocumented), so that is also accepted (see
3059 else if (Ustrcmp(argrest, "m") == 0) {}
3061 /* -oo: An ancient flag for old-style addresses which still seems to
3062 crop up in some calls (see in SCO). */
3064 else if (Ustrcmp(argrest, "o") == 0) {}
3066 /* -oP <name>: set pid file path for daemon */
3068 else if (Ustrcmp(argrest, "P") == 0)
3069 override_pid_file_path = argv[++i];
3071 /* -or <n>: set timeout for non-SMTP acceptance
3072 -os <n>: set timeout for SMTP acceptance */
3074 else if (*argrest == 'r' || *argrest == 's')
3076 int *tp = (*argrest == 'r')?
3077 &arg_receive_timeout : &arg_smtp_receive_timeout;
3078 if (argrest[1] == 0)
3080 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3082 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3084 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3087 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3089 else if (Ustrcmp(argrest, "X") == 0)
3090 override_local_interfaces = argv[++i];
3092 /* Unknown -o argument */
3098 /* -ps: force Perl startup; -pd force delayed Perl startup */
3102 if (*argrest == 's' && argrest[1] == 0)
3104 perl_start_option = 1;
3107 if (*argrest == 'd' && argrest[1] == 0)
3109 perl_start_option = -1;
3114 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3115 which sets the host protocol and host name */
3119 argrest = argv[++i];
3121 { badarg = TRUE; break; }
3127 if (received_protocol)
3128 exim_fail("received_protocol is set already\n");
3130 hn = Ustrchr(argrest, ':');
3132 received_protocol = argrest;
3135 int old_pool = store_pool;
3136 store_pool = POOL_PERM;
3137 received_protocol = string_copyn(argrest, hn - argrest);
3138 store_pool = old_pool;
3139 sender_host_name = hn + 1;
3146 receiving_message = FALSE;
3147 if (queue_interval >= 0)
3148 exim_fail("exim: -q specified more than once\n");
3150 /* -qq...: Do queue runs in a 2-stage manner */
3152 if (*argrest == 'q')
3154 f.queue_2stage = TRUE;
3158 /* -qi...: Do only first (initial) deliveries */
3160 if (*argrest == 'i')
3162 f.queue_run_first_delivery = TRUE;
3166 /* -qf...: Run the queue, forcing deliveries
3167 -qff..: Ditto, forcing thawing as well */
3169 if (*argrest == 'f')
3171 f.queue_run_force = TRUE;
3172 if (*++argrest == 'f')
3174 f.deliver_force_thaw = TRUE;
3179 /* -q[f][f]l...: Run the queue only on local deliveries */
3181 if (*argrest == 'l')
3183 f.queue_run_local = TRUE;
3187 /* -q[f][f][l][G<name>]... Work on the named queue */
3189 if (*argrest == 'G')
3192 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3193 queue_name = string_copyn(argrest, i);
3195 if (*argrest == '/') argrest++;
3198 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3199 only, optionally named, optionally starting from a given message id. */
3201 if (!(list_queue || count_queue))
3203 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3206 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3207 start_queue_run_id = argv[++i];
3208 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3209 stop_queue_run_id = argv[++i];
3212 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3213 forced, optionally local only, optionally named. */
3215 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3217 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3221 case 'R': /* Synonymous with -qR... */
3222 receiving_message = FALSE;
3224 /* -Rf: As -R (below) but force all deliveries,
3225 -Rff: Ditto, but also thaw all frozen messages,
3226 -Rr: String is regex
3227 -Rrf: Regex and force
3228 -Rrff: Regex and force and thaw
3230 in all cases provided there are no further characters in this
3234 for (int i = 0; i < nelem(rsopts); i++)
3235 if (Ustrcmp(argrest, rsopts[i]) == 0)
3237 if (i != 2) f.queue_run_force = TRUE;
3238 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3239 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3240 argrest += Ustrlen(rsopts[i]);
3243 /* -R: Set string to match in addresses for forced queue run to
3244 pick out particular messages. */
3247 deliver_selectstring = argrest;
3248 else if (i+1 < argc)
3249 deliver_selectstring = argv[++i];
3251 exim_fail("exim: string expected after -R\n");
3255 /* -r: an obsolete synonym for -f (see above) */
3258 /* -S: Like -R but works on sender. */
3260 case 'S': /* Synonymous with -qS... */
3261 receiving_message = FALSE;
3263 /* -Sf: As -S (below) but force all deliveries,
3264 -Sff: Ditto, but also thaw all frozen messages,
3265 -Sr: String is regex
3266 -Srf: Regex and force
3267 -Srff: Regex and force and thaw
3269 in all cases provided there are no further characters in this
3273 for (int i = 0; i < nelem(rsopts); i++)
3274 if (Ustrcmp(argrest, rsopts[i]) == 0)
3276 if (i != 2) f.queue_run_force = TRUE;
3277 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3278 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3279 argrest += Ustrlen(rsopts[i]);
3282 /* -S: Set string to match in addresses for forced queue run to
3283 pick out particular messages. */
3286 deliver_selectstring_sender = argrest;
3287 else if (i+1 < argc)
3288 deliver_selectstring_sender = argv[++i];
3290 exim_fail("exim: string expected after -S\n");
3293 /* -Tqt is an option that is exclusively for use by the testing suite.
3294 It is not recognized in other circumstances. It allows for the setting up
3295 of explicit "queue times" so that various warning/retry things can be
3296 tested. Otherwise variability of clock ticks etc. cause problems. */
3299 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3300 fudged_queue_times = argv[++i];
3305 /* -t: Set flag to extract recipients from body of message. */
3308 if (*argrest == 0) extract_recipients = TRUE;
3310 /* -ti: Set flag to extract recipients from body of message, and also
3311 specify that dot does not end the message. */
3313 else if (Ustrcmp(argrest, "i") == 0)
3315 extract_recipients = TRUE;
3319 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3322 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3329 /* -U: This means "initial user submission" in sendmail, apparently. The
3330 doc claims that in future sendmail may refuse syntactically invalid
3331 messages instead of fixing them. For the moment, we just ignore it. */
3337 /* -v: verify things - this is a very low-level debugging */
3342 debug_selector |= D_v;
3343 debug_file = stderr;
3349 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3351 The -x flag tells the sendmail command that mail from a local
3352 mail program has National Language Support (NLS) extended characters
3353 in the body of the mail item. The sendmail command can send mail with
3354 extended NLS characters across networks that normally corrupts these
3357 As Exim is 8-bit clean, it just ignores this flag. */
3360 if (*argrest != 0) badarg = TRUE;
3363 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3364 logs to that file. We swallow the parameter and otherwise ignore it. */
3367 if (*argrest == '\0')
3369 exim_fail("exim: string expected after -X\n");
3373 if (*argrest == '\0')
3375 log_oneline = argv[i];
3377 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3380 /* All other initial characters are errors */
3385 } /* End of high-level switch statement */
3387 /* Failed to recognize the option, or syntax error */
3390 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3391 "option %s\n", arg);
3395 /* If -R or -S have been specified without -q, assume a single queue run. */
3397 if ( (deliver_selectstring || deliver_selectstring_sender)
3398 && queue_interval < 0)
3403 /* If usage_wanted is set we call the usage function - which never returns */
3404 if (usage_wanted) exim_usage(called_as);
3406 /* Arguments have been processed. Check for incompatibilities. */
3408 (smtp_input || extract_recipients || recipients_arg < argc) &&
3409 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3410 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3411 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3414 msg_action_arg > 0 &&
3415 (f.daemon_listen || queue_interval > 0 || list_options ||
3416 (checking && msg_action != MSG_LOAD) ||
3417 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3420 (f.daemon_listen || queue_interval > 0) &&
3421 (sender_address != NULL || list_options || list_queue || checking ||
3425 f.daemon_listen && queue_interval == 0
3428 f.inetd_wait_mode && queue_interval >= 0
3432 (checking || smtp_input || extract_recipients ||
3433 filter_test != FTEST_NONE || bi_option)
3436 verify_address_mode &&
3437 (f.address_test_mode || smtp_input || extract_recipients ||
3438 filter_test != FTEST_NONE || bi_option)
3441 f.address_test_mode && (smtp_input || extract_recipients ||
3442 filter_test != FTEST_NONE || bi_option)
3445 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3449 deliver_selectstring != NULL && queue_interval < 0
3452 msg_action == MSG_LOAD &&
3453 (!expansion_test || expansion_test_message != NULL)
3456 exim_fail("exim: incompatible command-line options or arguments\n");
3458 /* If debugging is set up, set the file and the file descriptor to pass on to
3459 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3460 to run in the foreground. */
3462 if (debug_selector != 0)
3464 debug_file = stderr;
3465 debug_fd = fileno(debug_file);
3466 f.background_daemon = FALSE;
3467 if (f.running_in_test_harness) millisleep(100); /* lets caller finish */
3468 if (debug_selector != D_v) /* -v only doesn't show this */
3470 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3471 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3473 if (!version_printed)
3474 show_whats_supported(stderr);
3478 /* When started with root privilege, ensure that the limits on the number of
3479 open files and the number of processes (where that is accessible) are
3480 sufficiently large, or are unset, in case Exim has been called from an
3481 environment where the limits are screwed down. Not all OS have the ability to
3482 change some of these limits. */
3486 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3492 #ifdef RLIMIT_NOFILE
3493 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3495 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3497 rlp.rlim_cur = rlp.rlim_max = 0;
3500 /* I originally chose 1000 as a nice big number that was unlikely to
3501 be exceeded. It turns out that some older OS have a fixed upper limit of
3504 if (rlp.rlim_cur < 1000)
3506 rlp.rlim_cur = rlp.rlim_max = 1000;
3507 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3509 rlp.rlim_cur = rlp.rlim_max = 256;
3510 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3511 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3518 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3520 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3522 rlp.rlim_cur = rlp.rlim_max = 0;
3525 #ifdef RLIM_INFINITY
3526 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3528 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3530 if (rlp.rlim_cur < 1000)
3532 rlp.rlim_cur = rlp.rlim_max = 1000;
3534 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3535 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3541 /* Exim is normally entered as root (but some special configurations are
3542 possible that don't do this). However, it always spins off sub-processes that
3543 set their uid and gid as required for local delivery. We don't want to pass on
3544 any extra groups that root may belong to, so we want to get rid of them all at
3547 We need to obey setgroups() at this stage, before possibly giving up root
3548 privilege for a changed configuration file, but later on we might need to
3549 check on the additional groups for the admin user privilege - can't do that
3550 till after reading the config, which might specify the exim gid. Therefore,
3551 save the group list here first. */
3553 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3554 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3556 /* There is a fundamental difference in some BSD systems in the matter of
3557 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3558 known not to be different. On the "different" systems there is a single group
3559 list, and the first entry in it is the current group. On all other versions of
3560 Unix there is a supplementary group list, which is in *addition* to the current
3561 group. Consequently, to get rid of all extraneous groups on a "standard" system
3562 you pass over 0 groups to setgroups(), while on a "different" system you pass
3563 over a single group - the current group, which is always the first group in the
3564 list. Calling setgroups() with zero groups on a "different" system results in
3565 an error return. The following code should cope with both types of system.
3567 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3568 the "setgroups() with zero groups" - and changes the egid.
3569 Thanks to that we had to stash the original_egid above, for use below
3570 in the call to exim_setugid().
3572 However, if this process isn't running as root, setgroups() can't be used
3573 since you have to be root to run it, even if throwing away groups. Not being
3574 root here happens only in some unusual configurations. We just ignore the
3577 if (setgroups(0, NULL) != 0 && setgroups(1, group_list) != 0 && !unprivileged)
3578 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3580 /* If the configuration file name has been altered by an argument on the
3581 command line (either a new file name or a macro definition) and the caller is
3582 not root, or if this is a filter testing run, remove any setuid privilege the
3583 program has and run as the underlying user.
3585 The exim user is locked out of this, which severely restricts the use of -C
3588 Otherwise, set the real ids to the effective values (should be root unless run
3589 from inetd, which it can either be root or the exim uid, if one is configured).
3591 There is a private mechanism for bypassing some of this, in order to make it
3592 possible to test lots of configurations automatically, without having either to
3593 recompile each time, or to patch in an actual configuration file name and other
3594 values (such as the path name). If running in the test harness, pretend that
3595 configuration file changes and macro definitions haven't happened. */
3598 (!f.trusted_config || /* Config changed, or */
3599 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3600 real_uid != root_uid && /* Not root, and */
3601 !f.running_in_test_harness /* Not fudged */
3603 expansion_test /* expansion testing */
3605 filter_test != FTEST_NONE) /* Filter testing */
3607 setgroups(group_count, group_list);
3608 exim_setugid(real_uid, real_gid, FALSE,
3609 US"-C, -D, -be or -bf forces real uid");
3610 removed_privilege = TRUE;
3612 /* In the normal case when Exim is called like this, stderr is available
3613 and should be used for any logging information because attempts to write
3614 to the log will usually fail. To arrange this, we unset really_exim. However,
3615 if no stderr is available there is no point - we might as well have a go
3616 at the log (if it fails, syslog will be written).
3618 Note that if the invoker is Exim, the logs remain available. Messing with
3619 this causes unlogged successful deliveries. */
3621 if (log_stderr && real_uid != exim_uid)
3622 f.really_exim = FALSE;
3625 /* Privilege is to be retained for the moment. It may be dropped later,
3626 depending on the job that this Exim process has been asked to do. For now, set
3627 the real uid to the effective so that subsequent re-execs of Exim are done by a
3631 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3633 /* If testing a filter, open the file(s) now, before wasting time doing other
3634 setups and reading the message. */
3636 if (filter_test & FTEST_SYSTEM)
3637 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3638 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3641 if (filter_test & FTEST_USER)
3642 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3643 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3646 /* Initialise lookup_list
3647 If debugging, already called above via version reporting.
3648 In either case, we initialise the list of available lookups while running
3649 as root. All dynamically modules are loaded from a directory which is
3650 hard-coded into the binary and is code which, if not a module, would be
3651 part of Exim already. Ability to modify the content of the directory
3652 is equivalent to the ability to modify a setuid binary!
3654 This needs to happen before we read the main configuration. */
3658 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3661 /* Read the main runtime configuration data; this gives up if there
3662 is a failure. It leaves the configuration file open so that the subsequent
3663 configuration data for delivery can be read if needed.
3665 NOTE: immediately after opening the configuration file we change the working
3666 directory to "/"! Later we change to $spool_directory. We do it there, because
3667 during readconf_main() some expansion takes place already. */
3669 /* Store the initial cwd before we change directories. Can be NULL if the
3670 dir has already been unlinked. */
3671 initial_cwd = os_getcwd(NULL, 0);
3674 -be[m] expansion test -
3675 -b[fF] filter test new
3677 -bmalware malware_test_file new
3679 -brw rewrite test new
3681 -bv[s] address verify -
3683 -bP <option> (except -bP config, which sets list_config)
3685 If any of these options is set, we suppress warnings about configuration
3686 issues (currently about tls_advertise_hosts and keep_environment not being
3689 readconf_main(checking || list_options);
3692 /* Now in directory "/" */
3694 if (cleanup_environment() == FALSE)
3695 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3698 /* If an action on specific messages is requested, or if a daemon or queue
3699 runner is being started, we need to know if Exim was called by an admin user.
3700 This is the case if the real user is root or exim, or if the real group is
3701 exim, or if one of the supplementary groups is exim or a group listed in
3702 admin_groups. We don't fail all message actions immediately if not admin_user,
3703 since some actions can be performed by non-admin users. Instead, set admin_user
3704 for later interrogation. */
3706 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3707 f.admin_user = TRUE;
3709 for (int i = 0; i < group_count && !f.admin_user; i++)
3710 if (group_list[i] == exim_gid)
3711 f.admin_user = TRUE;
3712 else if (admin_groups)
3713 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3714 if (admin_groups[j] == group_list[i])
3715 f.admin_user = TRUE;
3717 /* Another group of privileged users are the trusted users. These are root,
3718 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3719 are permitted to specify sender_addresses with -f on the command line, and
3720 other message parameters as well. */
3722 if (real_uid == root_uid || real_uid == exim_uid)
3723 f.trusted_caller = TRUE;
3727 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3728 if (trusted_users[i] == real_uid)
3729 f.trusted_caller = TRUE;
3732 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3733 if (trusted_groups[i] == real_gid)
3734 f.trusted_caller = TRUE;
3735 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3736 if (trusted_groups[i] == group_list[j])
3737 f.trusted_caller = TRUE;
3740 /* At this point, we know if the user is privileged and some command-line
3741 options become possibly impermissible, depending upon the configuration file. */
3743 if (checking && commandline_checks_require_admin && !f.admin_user)
3744 exim_fail("exim: those command-line flags are set to require admin\n");
3746 /* Handle the decoding of logging options. */
3748 decode_bits(log_selector, log_selector_size, log_notall,
3749 log_selector_string, log_options, log_options_count, US"log", 0);
3753 debug_printf("configuration file is %s\n", config_main_filename);
3754 debug_printf("log selectors =");
3755 for (int i = 0; i < log_selector_size; i++)
3756 debug_printf(" %08x", log_selector[i]);
3760 /* If domain literals are not allowed, check the sender address that was
3761 supplied with -f. Ditto for a stripped trailing dot. */
3765 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3766 exim_fail("exim: bad -f address \"%s\": domain literals not "
3767 "allowed\n", sender_address);
3768 if (f_end_dot && !strip_trailing_dot)
3769 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3770 "(trailing dot not allowed)\n", sender_address);
3773 /* See if an admin user overrode our logging. */
3775 if (cmdline_syslog_name)
3778 syslog_processname = cmdline_syslog_name;
3779 log_file_path = string_copy(CUS"syslog");
3782 /* not a panic, non-privileged users should not be able to spam paniclog */
3784 "exim: you lack sufficient privilege to specify syslog process name\n");
3786 /* Paranoia check of maximum lengths of certain strings. There is a check
3787 on the length of the log file path in log.c, which will come into effect
3788 if there are any calls to write the log earlier than this. However, if we
3789 get this far but the string is very long, it is better to stop now than to
3790 carry on and (e.g.) receive a message and then have to collapse. The call to
3791 log_write() from here will cause the ultimate panic collapse if the complete
3792 file name exceeds the buffer length. */
3794 if (Ustrlen(log_file_path) > 200)
3795 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3796 "log_file_path is longer than 200 chars: aborting");
3798 if (Ustrlen(pid_file_path) > 200)
3799 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3800 "pid_file_path is longer than 200 chars: aborting");
3802 if (Ustrlen(spool_directory) > 200)
3803 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3804 "spool_directory is longer than 200 chars: aborting");
3806 /* Length check on the process name given to syslog for its TAG field,
3807 which is only permitted to be 32 characters or less. See RFC 3164. */
3809 if (Ustrlen(syslog_processname) > 32)
3810 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3811 "syslog_processname is longer than 32 chars: aborting");
3816 log_write(0, LOG_MAIN, "%s", log_oneline);
3817 return EXIT_SUCCESS;
3820 return EXIT_FAILURE;
3822 /* In some operating systems, the environment variable TMPDIR controls where
3823 temporary files are created; Exim doesn't use these (apart from when delivering
3824 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3825 If TMPDIR is found in the environment, reset it to the value defined in the
3826 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3827 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3828 EXIM_TMPDIR by the build scripts.
3832 if (environ) for (uschar ** p = USS environ; *p; p++)
3833 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3835 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3836 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3838 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3842 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3843 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3844 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3845 called by a user who has set the TZ variable. This then affects the timestamps
3846 in log files and in Received: headers, and any created Date: header lines. The
3847 required timezone is settable in the configuration file, so nothing can be done
3848 about this earlier - but hopefully nothing will normally be logged earlier than
3849 this. We have to make a new environment if TZ is wrong, but don't bother if
3850 timestamps_utc is set, because then all times are in UTC anyway. */
3852 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3853 f.timestamps_utc = TRUE;
3856 uschar *envtz = US getenv("TZ");
3858 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3859 : timezone_string != NULL
3862 uschar **p = USS environ;
3866 if (environ) while (*p++) count++;
3867 if (!envtz) count++;
3868 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3869 if (environ) for (p = USS environ; *p; p++)
3870 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3871 if (timezone_string)
3873 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3874 sprintf(CS *newp++, "TZ=%s", timezone_string);
3879 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3880 tod_stamp(tod_log));
3884 /* Handle the case when we have removed the setuid privilege because of -C or
3885 -D. This means that the caller of Exim was not root.
3887 There is a problem if we were running as the Exim user. The sysadmin may
3888 expect this case to retain privilege because "the binary was called by the
3889 Exim user", but it hasn't, because either the -D option set macros, or the
3890 -C option set a non-trusted configuration file. There are two possibilities:
3892 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3893 to do message deliveries. Thus, the fact that it is running as a
3894 non-privileged user is plausible, and might be wanted in some special
3895 configurations. However, really_exim will have been set false when
3896 privilege was dropped, to stop Exim trying to write to its normal log
3897 files. Therefore, re-enable normal log processing, assuming the sysadmin
3898 has set up the log directory correctly.
3900 (2) If deliver_drop_privilege is not set, the configuration won't work as
3901 apparently intended, and so we log a panic message. In order to retain
3902 root for -C or -D, the caller must either be root or be invoking a
3903 trusted configuration file (when deliver_drop_privilege is false). */
3905 if ( removed_privilege
3906 && (!f.trusted_config || opt_D_used)
3907 && real_uid == exim_uid)
3908 if (deliver_drop_privilege)
3909 f.really_exim = TRUE; /* let logging work normally */
3911 log_write(0, LOG_MAIN|LOG_PANIC,
3912 "exim user lost privilege for using %s option",
3913 f.trusted_config? "-D" : "-C");
3915 /* Start up Perl interpreter if Perl support is configured and there is a
3916 perl_startup option, and the configuration or the command line specifies
3917 initializing starting. Note that the global variables are actually called
3918 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3921 if (perl_start_option != 0)
3922 opt_perl_at_start = (perl_start_option > 0);
3923 if (opt_perl_at_start && opt_perl_startup != NULL)
3926 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3927 if ((errstr = init_perl(opt_perl_startup)))
3928 exim_fail("exim: error in perl_startup code: %s\n", errstr);
3929 opt_perl_started = TRUE;
3931 #endif /* EXIM_PERL */
3933 /* Log the arguments of the call if the configuration file said so. This is
3934 a debugging feature for finding out what arguments certain MUAs actually use.
3935 Don't attempt it if logging is disabled, or if listing variables or if
3936 verifying/testing addresses or expansions. */
3938 if ( (debug_selector & D_any || LOGGING(arguments))
3939 && f.really_exim && !list_options && !checking)
3941 uschar *p = big_buffer;
3942 Ustrcpy(p, US"cwd= (failed)");
3948 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
3949 p += 4 + Ustrlen(initial_cwd);
3950 /* in case p is near the end and we don't provide enough space for
3951 * string_format to be willing to write. */
3955 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3957 for (int i = 0; i < argc; i++)
3959 int len = Ustrlen(argv[i]);
3960 const uschar *printing;
3962 if (p + len + 8 >= big_buffer + big_buffer_size)
3964 Ustrcpy(p, US" ...");
3965 log_write(0, LOG_MAIN, "%s", big_buffer);
3966 Ustrcpy(big_buffer, US"...");
3969 printing = string_printing(argv[i]);
3970 if (printing[0] == 0) quote = US"\""; else
3972 const uschar *pp = printing;
3974 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3976 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3977 (p - big_buffer) - 4), printing, quote);
3980 if (LOGGING(arguments))
3981 log_write(0, LOG_MAIN, "%s", big_buffer);
3983 debug_printf("%s\n", big_buffer);
3986 /* Set the working directory to be the top-level spool directory. We don't rely
3987 on this in the code, which always uses fully qualified names, but it's useful
3988 for core dumps etc. Don't complain if it fails - the spool directory might not
3989 be generally accessible and calls with the -C option (and others) have lost
3990 privilege by now. Before the chdir, we try to ensure that the directory exists.
3993 if (Uchdir(spool_directory) != 0)
3996 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3997 dummy = /* quieten compiler */ Uchdir(spool_directory);
3998 dummy = dummy; /* yet more compiler quietening, sigh */
4001 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4002 alias file. Exim doesn't have such a concept, but this call is screwed into
4003 Sun's YP makefiles. Handle this by calling a configured script, as the real
4004 user who called Exim. The -oA option can be used to pass an argument to the
4009 (void)fclose(config_file);
4010 if (bi_command != NULL)
4014 argv[i++] = bi_command;
4015 if (alias_arg != NULL) argv[i++] = alias_arg;
4018 setgroups(group_count, group_list);
4019 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4021 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4022 (argv[1] == NULL)? US"" : argv[1]);
4024 execv(CS argv[0], (char *const *)argv);
4025 exim_fail("exim: exec failed: %s\n", strerror(errno));
4029 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4034 /* We moved the admin/trusted check to be immediately after reading the
4035 configuration file. We leave these prints here to ensure that syslog setup,
4036 logfile setup, and so on has already happened. */
4038 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4039 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4041 /* Only an admin user may start the daemon or force a queue run in the default
4042 configuration, but the queue run restriction can be relaxed. Only an admin
4043 user may request that a message be returned to its sender forthwith. Only an
4044 admin user may specify a debug level greater than D_v (because it might show
4045 passwords, etc. in lookup queries). Only an admin user may request a queue
4046 count. Only an admin user can use the test interface to scan for email
4047 (because Exim will be in the spool dir and able to look at mails). */
4051 BOOL debugset = (debug_selector & ~D_v) != 0;
4052 if (deliver_give_up || f.daemon_listen || malware_test_file ||
4053 (count_queue && queue_list_requires_admin) ||
4054 (list_queue && queue_list_requires_admin) ||
4055 (queue_interval >= 0 && prod_requires_admin) ||
4056 (debugset && !f.running_in_test_harness))
4057 exim_fail("exim:%s permission denied\n", debugset? " debugging" : "");
4060 /* If the real user is not root or the exim uid, the argument for passing
4061 in an open TCP/IP connection for another message is not permitted, nor is
4062 running with the -N option for any delivery action, unless this call to exim is
4063 one that supplied an input message, or we are using a patched exim for
4064 regression testing. */
4066 if (real_uid != root_uid && real_uid != exim_uid &&
4067 (continue_hostname != NULL ||
4069 (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4070 )) && !f.running_in_test_harness)
4071 exim_fail("exim: Permission denied\n");
4073 /* If the caller is not trusted, certain arguments are ignored when running for
4074 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4075 Note that authority for performing certain actions on messages is tested in the
4076 queue_action() function. */
4078 if (!f.trusted_caller && !checking)
4080 sender_host_name = sender_host_address = interface_address =
4081 sender_ident = received_protocol = NULL;
4082 sender_host_port = interface_port = 0;
4083 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4086 /* If a sender host address is set, extract the optional port number off the
4087 end of it and check its syntax. Do the same thing for the interface address.
4088 Exim exits if the syntax is bad. */
4092 if (sender_host_address != NULL)
4093 sender_host_port = check_port(sender_host_address);
4094 if (interface_address != NULL)
4095 interface_port = check_port(interface_address);
4098 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4101 if (f.trusted_caller)
4103 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4104 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4107 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4110 /* If an SMTP message is being received check to see if the standard input is a
4111 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4112 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4117 union sockaddr_46 inetd_sock;
4118 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4119 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4121 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4122 if (family == AF_INET || family == AF_INET6)
4124 union sockaddr_46 interface_sock;
4125 size = sizeof(interface_sock);
4127 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4128 interface_address = host_ntoa(-1, &interface_sock, NULL,
4131 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4133 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4136 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4137 NULL, &sender_host_port);
4138 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4139 "inetd is not supported when mua_wrapper is set");
4143 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4148 /* If the load average is going to be needed while receiving a message, get it
4149 now for those OS that require the first call to os_getloadavg() to be done as
4150 root. There will be further calls later for each message received. */
4152 #ifdef LOAD_AVG_NEEDS_ROOT
4153 if (receiving_message &&
4154 (queue_only_load >= 0 ||
4155 (f.is_inetd && smtp_load_reserve >= 0)
4158 load_average = OS_GETLOADAVG();
4162 /* The queue_only configuration option can be overridden by -odx on the command
4163 line, except that if queue_only_override is false, queue_only cannot be unset
4164 from the command line. */
4166 if (queue_only_set && (queue_only_override || arg_queue_only))
4167 queue_only = arg_queue_only;
4169 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4172 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4173 if (arg_smtp_receive_timeout >= 0)
4174 smtp_receive_timeout = arg_smtp_receive_timeout;
4176 /* If Exim was started with root privilege, unless we have already removed the
4177 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4178 except when starting the daemon or doing some kind of delivery or address
4179 testing (-bt). These are the only cases when root need to be retained. We run
4180 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4181 retained only for starting the daemon. We always do the initgroups() in this
4182 situation (controlled by the TRUE below), in order to be as close as possible
4183 to the state Exim usually runs in. */
4185 if (!unprivileged && /* originally had root AND */
4186 !removed_privilege && /* still got root AND */
4187 !f.daemon_listen && /* not starting the daemon */
4188 queue_interval <= 0 && /* (either kind of daemon) */
4190 deliver_drop_privilege || /* requested unprivileged */
4192 queue_interval < 0 && /* not running the queue */
4193 (msg_action_arg < 0 || /* and */
4194 msg_action != MSG_DELIVER) && /* not delivering and */
4195 (!checking || !f.address_test_mode) /* not address checking */
4197 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4199 /* When we are retaining a privileged uid, we still change to the exim gid. */
4204 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4205 rv = setgid(exim_gid);
4206 /* Impact of failure is that some stuff might end up with an incorrect group.
4207 We track this for failures from root, since any attempt to change privilege
4208 by root should succeed and failures should be examined. For non-root,
4209 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4210 no need to complain then. */
4212 if (!(unprivileged || removed_privilege))
4213 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4215 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4216 (long int)exim_gid, strerror(errno));
4219 /* Handle a request to scan a file for malware */
4220 if (malware_test_file)
4222 #ifdef WITH_CONTENT_SCAN
4224 set_process_info("scanning file for malware");
4225 result = malware_in_file(malware_test_file);
4228 printf("No malware found.\n");
4233 printf("Malware lookup returned non-okay/fail: %d\n", result);
4237 printf("Malware found: %s\n", malware_name);
4239 printf("Malware scan detected malware of unknown name.\n");
4241 printf("Malware scanning not enabled at compile time.\n");
4246 /* Handle a request to list the delivery queue */
4250 set_process_info("listing the queue");
4251 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4255 /* Handle a request to count the delivery queue */
4259 set_process_info("counting the queue");
4264 /* Handle actions on specific messages, except for the force delivery and
4265 message load actions, which are done below. Some actions take a whole list of
4266 message ids, which are known to continue up to the end of the arguments. Others
4267 take a single message id and then operate on the recipients list. */
4269 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4271 int yield = EXIT_SUCCESS;
4272 set_process_info("acting on specified messages");
4274 /* ACL definitions may be needed when removing a message (-Mrm) because
4275 event_action gets expanded */
4277 if (msg_action == MSG_REMOVE)
4280 if (!one_msg_action)
4282 for (i = msg_action_arg; i < argc; i++)
4283 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4284 yield = EXIT_FAILURE;
4287 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4288 recipients_arg)) yield = EXIT_FAILURE;
4292 /* We used to set up here to skip reading the ACL section, on
4293 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4294 Now, since the intro of the ${acl } expansion, ACL definitions may be
4295 needed in transports so we lost the optimisation. */
4299 /* Handle the -brt option. This is for checking out retry configurations.
4300 The next three arguments are a domain name or a complete address, and
4301 optionally two error numbers. All it does is to call the function that
4302 scans the retry configuration data. */
4304 if (test_retry_arg >= 0)
4306 retry_config *yield;
4307 int basic_errno = 0;
4311 if (test_retry_arg >= argc)
4313 printf("-brt needs a domain or address argument\n");
4314 exim_exit(EXIT_FAILURE, US"main");
4316 s1 = argv[test_retry_arg++];
4319 /* If the first argument contains no @ and no . it might be a local user
4320 or it might be a single-component name. Treat as a domain. */
4322 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4324 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4325 "being \ntreated as a one-component domain, not as a local part.\n\n",
4329 /* There may be an optional second domain arg. */
4331 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4332 s2 = argv[test_retry_arg++];
4334 /* The final arg is an error name */
4336 if (test_retry_arg < argc)
4338 uschar *ss = argv[test_retry_arg];
4340 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4343 printf("%s\n", CS error);
4344 return EXIT_FAILURE;
4347 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4348 code > 100 as an error is for matching codes to the decade. Turn them into
4349 a real error code, off the decade. */
4351 if (basic_errno == ERRNO_MAIL4XX ||
4352 basic_errno == ERRNO_RCPT4XX ||
4353 basic_errno == ERRNO_DATA4XX)
4355 int code = (more_errno >> 8) & 255;
4357 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4358 else if (code > 100)
4359 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4363 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4364 printf("No retry information found\n");
4367 more_errno = yield->more_errno;
4368 printf("Retry rule: %s ", yield->pattern);
4370 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4372 printf("quota%s%s ",
4373 (more_errno > 0)? "_" : "",
4374 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4376 else if (yield->basic_errno == ECONNREFUSED)
4378 printf("refused%s%s ",
4379 (more_errno > 0)? "_" : "",
4380 (more_errno == 'M')? "MX" :
4381 (more_errno == 'A')? "A" : "");
4383 else if (yield->basic_errno == ETIMEDOUT)
4386 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4388 if (more_errno != 0) printf("_%s",
4389 (more_errno == 'M')? "MX" : "A");
4392 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4393 printf("auth_failed ");
4396 for (retry_rule * r = yield->rules; r; r = r->next)
4398 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4399 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4405 printf(",%d.", x/1000);
4419 exim_exit(EXIT_SUCCESS, US"main");
4422 /* Handle a request to list one or more configuration options */
4423 /* If -n was set, we suppress some information */
4428 set_process_info("listing variables");
4429 if (recipients_arg >= argc)
4430 fail = !readconf_print(US"all", NULL, flag_n);
4431 else for (i = recipients_arg; i < argc; i++)
4434 (Ustrcmp(argv[i], "router") == 0 ||
4435 Ustrcmp(argv[i], "transport") == 0 ||
4436 Ustrcmp(argv[i], "authenticator") == 0 ||
4437 Ustrcmp(argv[i], "macro") == 0 ||
4438 Ustrcmp(argv[i], "environment") == 0))
4440 fail |= !readconf_print(argv[i+1], argv[i], flag_n);
4444 fail = !readconf_print(argv[i], NULL, flag_n);
4446 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS, US"main");
4451 set_process_info("listing config");
4452 exim_exit(readconf_print(US"config", NULL, flag_n)
4453 ? EXIT_SUCCESS : EXIT_FAILURE, US"main");
4457 /* Initialise subsystems as required */
4458 #ifndef DISABLE_DKIM
4464 /* Handle a request to deliver one or more messages that are already on the
4465 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4466 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4468 Delivery of specific messages is typically used for a small number when
4469 prodding by hand (when the option forced_delivery will be set) or when
4470 re-execing to regain root privilege. Each message delivery must happen in a
4471 separate process, so we fork a process for each one, and run them sequentially
4472 so that debugging output doesn't get intertwined, and to avoid spawning too
4473 many processes if a long list is given. However, don't fork for the last one;
4474 this saves a process in the common case when Exim is called to deliver just one
4477 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4479 if (prod_requires_admin && !f.admin_user)
4481 fprintf(stderr, "exim: Permission denied\n");
4482 exim_exit(EXIT_FAILURE, US"main");
4484 set_process_info("delivering specified messages");
4485 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4486 for (i = msg_action_arg; i < argc; i++)
4491 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4492 else if ((pid = fork()) == 0)
4494 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4495 exim_underbar_exit(EXIT_SUCCESS);
4499 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4501 exim_exit(EXIT_FAILURE, US"main");
4505 exim_exit(EXIT_SUCCESS, US"main");
4509 /* If only a single queue run is requested, without SMTP listening, we can just
4510 turn into a queue runner, with an optional starting message id. */
4512 if (queue_interval == 0 && !f.daemon_listen)
4514 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4515 (start_queue_run_id == NULL)? US"" : US" starting at ",
4516 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4517 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4518 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4520 set_process_info("running the '%s' queue (single queue run)", queue_name);
4522 set_process_info("running the queue (single queue run)");
4523 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4524 exim_exit(EXIT_SUCCESS, US"main");
4528 /* Find the login name of the real user running this process. This is always
4529 needed when receiving a message, because it is written into the spool file. It
4530 may also be used to construct a from: or a sender: header, and in this case we
4531 need the user's full name as well, so save a copy of it, checked for RFC822
4532 syntax and munged if necessary, if it hasn't previously been set by the -F
4533 argument. We may try to get the passwd entry more than once, in case NIS or
4534 other delays are in evidence. Save the home directory for use in filter testing
4539 if ((pw = getpwuid(real_uid)) != NULL)
4541 originator_login = string_copy(US pw->pw_name);
4542 originator_home = string_copy(US pw->pw_dir);
4544 /* If user name has not been set by -F, set it from the passwd entry
4545 unless -f has been used to set the sender address by a trusted user. */
4547 if (!originator_name)
4549 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4551 uschar *name = US pw->pw_gecos;
4552 uschar *amp = Ustrchr(name, '&');
4555 /* Most Unix specify that a '&' character in the gecos field is
4556 replaced by a copy of the login name, and some even specify that
4557 the first character should be upper cased, so that's what we do. */
4562 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4563 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4564 buffer[loffset] = toupper(buffer[loffset]);
4568 /* If a pattern for matching the gecos field was supplied, apply
4569 it and then expand the name string. */
4571 if (gecos_pattern && gecos_name)
4574 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4576 if (regex_match_and_setup(re, name, 0, -1))
4578 uschar *new_name = expand_string(gecos_name);
4582 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4583 "gecos field \"%s\"\n", new_name, name);
4586 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4587 "\"%s\": %s\n", gecos_name, expand_string_message);
4589 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4590 "gecos field \"%s\"\n", gecos_pattern, name);
4591 store_free((void *)re);
4593 originator_name = string_copy(name);
4596 /* A trusted caller has used -f but not -F */
4598 else originator_name = US"";
4601 /* Break the retry loop */
4606 if (++i > finduser_retries) break;
4610 /* If we cannot get a user login, log the incident and give up, unless the
4611 configuration specifies something to use. When running in the test harness,
4612 any setting of unknown_login overrides the actual name. */
4614 if (originator_login == NULL || f.running_in_test_harness)
4616 if (unknown_login != NULL)
4618 originator_login = expand_string(unknown_login);
4619 if (originator_name == NULL && unknown_username != NULL)
4620 originator_name = expand_string(unknown_username);
4621 if (originator_name == NULL) originator_name = US"";
4623 if (originator_login == NULL)
4624 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4628 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4631 originator_name = string_copy(parse_fix_phrase(originator_name,
4632 Ustrlen(originator_name), big_buffer, big_buffer_size));
4634 /* If a message is created by this call of Exim, the uid/gid of its originator
4635 are those of the caller. These values are overridden if an existing message is
4636 read in from the spool. */
4638 originator_uid = real_uid;
4639 originator_gid = real_gid;
4641 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4642 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4644 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4645 returns. We leave this till here so that the originator_ fields are available
4646 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4649 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
4653 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4654 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4655 "mua_wrapper is set");
4660 /* If the sender ident has not been set (by a trusted caller) set it to
4661 the caller. This will get overwritten below for an inetd call. If a trusted
4662 caller has set it empty, unset it. */
4664 if (!sender_ident) sender_ident = originator_login;
4665 else if (!*sender_ident) sender_ident = NULL;
4667 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4668 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4669 originator_* variables set. */
4671 if (test_rewrite_arg >= 0)
4673 f.really_exim = FALSE;
4674 if (test_rewrite_arg >= argc)
4676 printf("-brw needs an address argument\n");
4677 exim_exit(EXIT_FAILURE, US"main");
4679 rewrite_test(argv[test_rewrite_arg]);
4680 exim_exit(EXIT_SUCCESS, US"main");
4683 /* A locally-supplied message is considered to be coming from a local user
4684 unless a trusted caller supplies a sender address with -f, or is passing in the
4685 message via SMTP (inetd invocation or otherwise). */
4687 if ( !sender_address && !smtp_input
4688 || !f.trusted_caller && filter_test == FTEST_NONE)
4690 f.sender_local = TRUE;
4692 /* A trusted caller can supply authenticated_sender and authenticated_id
4693 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4694 defaults except when host checking. */
4696 if (!authenticated_sender && !host_checking)
4697 authenticated_sender = string_sprintf("%s@%s", originator_login,
4698 qualify_domain_sender);
4699 if (!authenticated_id && !host_checking)
4700 authenticated_id = originator_login;
4703 /* Trusted callers are always permitted to specify the sender address.
4704 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4705 is specified is the empty address. However, if a trusted caller does not
4706 specify a sender address for SMTP input, we leave sender_address unset. This
4707 causes the MAIL commands to be honoured. */
4709 if ( !smtp_input && !sender_address
4710 || !receive_check_set_sender(sender_address))
4712 /* Either the caller is not permitted to set a general sender, or this is
4713 non-SMTP input and the trusted caller has not set a sender. If there is no
4714 sender, or if a sender other than <> is set, override with the originator's
4715 login (which will get qualified below), except when checking things. */
4717 if (sender_address == NULL /* No sender_address set */
4719 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4720 !checking)) /* Not running tests, including filter tests */
4722 sender_address = originator_login;
4723 f.sender_address_forced = FALSE;
4724 sender_address_domain = 0;
4728 /* Remember whether an untrusted caller set the sender address */
4730 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
4732 /* Ensure that the sender address is fully qualified unless it is the empty
4733 address, which indicates an error message, or doesn't exist (root caller, smtp
4734 interface, no -f argument). */
4736 if (sender_address && *sender_address && sender_address_domain == 0)
4737 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4738 qualify_domain_sender);
4740 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4742 /* Handle a request to verify a list of addresses, or test them for delivery.
4743 This must follow the setting of the sender address, since routers can be
4744 predicated upon the sender. If no arguments are given, read addresses from
4745 stdin. Set debug_level to at least D_v to get full output for address testing.
4748 if (verify_address_mode || f.address_test_mode)
4751 int flags = vopt_qualify;
4753 if (verify_address_mode)
4755 if (!verify_as_sender) flags |= vopt_is_recipient;
4756 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4761 flags |= vopt_is_recipient;
4762 debug_selector |= D_v;
4763 debug_file = stderr;
4764 debug_fd = fileno(debug_file);
4765 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4768 if (recipients_arg < argc)
4770 while (recipients_arg < argc)
4772 uschar *s = argv[recipients_arg++];
4775 BOOL finished = FALSE;
4776 uschar *ss = parse_find_address_end(s, FALSE);
4777 if (*ss == ',') *ss = 0; else finished = TRUE;
4778 test_address(s, flags, &exit_value);
4781 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4788 uschar *s = get_stdinput(NULL, NULL);
4789 if (s == NULL) break;
4790 test_address(s, flags, &exit_value);
4794 exim_exit(exit_value, US"main");
4797 /* Handle expansion checking. Either expand items on the command line, or read
4798 from stdin if there aren't any. If -Mset was specified, load the message so
4799 that its variables can be used, but restrict this facility to admin users.
4800 Otherwise, if -bem was used, read a message from stdin. */
4804 dns_init(FALSE, FALSE, FALSE);
4805 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4807 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4809 exim_fail("exim: permission denied\n");
4810 message_id = argv[msg_action_arg];
4811 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4812 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
4813 printf ("Failed to load message datafile %s\n", message_id);
4814 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4815 printf ("Failed to load message %s\n", message_id);
4818 /* Read a test message from a file. We fudge it up to be on stdin, saving
4819 stdin itself for later reading of expansion strings. */
4821 else if (expansion_test_message)
4823 int save_stdin = dup(0);
4824 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4826 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
4829 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4830 message_ended = END_NOTENDED;
4831 read_message_body(receive_msg(extract_recipients));
4832 message_linecount += body_linecount;
4833 (void)dup2(save_stdin, 0);
4834 (void)close(save_stdin);
4835 clearerr(stdin); /* Required by Darwin */
4838 /* Only admin users may see config-file macros this way */
4840 if (!f.admin_user) macros_user = macros = mlast = NULL;
4842 /* Allow $recipients for this testing */
4844 f.enable_dollar_recipients = TRUE;
4846 /* Expand command line items */
4848 if (recipients_arg < argc)
4849 while (recipients_arg < argc)
4850 expansion_test_line(argv[recipients_arg++]);
4856 char *(*fn_readline)(const char *) = NULL;
4857 void (*fn_addhist)(const char *) = NULL;
4861 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4864 while (s = get_stdinput(fn_readline, fn_addhist))
4865 expansion_test_line(s);
4868 if (dlhandle) dlclose(dlhandle);
4872 /* The data file will be open after -Mset */
4874 if (deliver_datafile >= 0)
4876 (void)close(deliver_datafile);
4877 deliver_datafile = -1;
4880 exim_exit(EXIT_SUCCESS, US"main: expansion test");
4884 /* The active host name is normally the primary host name, but it can be varied
4885 for hosts that want to play several parts at once. We need to ensure that it is
4886 set for host checking, and for receiving messages. */
4888 smtp_active_hostname = primary_hostname;
4889 if (raw_active_hostname != NULL)
4891 uschar *nah = expand_string(raw_active_hostname);
4894 if (!f.expand_string_forcedfail)
4895 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4896 "(smtp_active_hostname): %s", raw_active_hostname,
4897 expand_string_message);
4899 else if (nah[0] != 0) smtp_active_hostname = nah;
4902 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4903 given IP address so that the blocking and relay configuration can be tested.
4904 Unless a sender_ident was set by -oMt, we discard it (the default is the
4905 caller's login name). An RFC 1413 call is made only if we are running in the
4906 test harness and an incoming interface and both ports are specified, because
4907 there is no TCP/IP call to find the ident for. */
4914 if (!sender_ident_set)
4916 sender_ident = NULL;
4917 if (f.running_in_test_harness && sender_host_port != 0 &&
4918 interface_address != NULL && interface_port != 0)
4919 verify_get_ident(1413);
4922 /* In case the given address is a non-canonical IPv6 address, canonicalize
4923 it. The code works for both IPv4 and IPv6, as it happens. */
4925 size = host_aton(sender_host_address, x);
4926 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
4927 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4929 /* Now set up for testing */
4931 host_build_sender_fullhost();
4935 f.sender_local = FALSE;
4936 f.sender_host_notsocket = TRUE;
4937 debug_file = stderr;
4938 debug_fd = fileno(debug_file);
4939 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4940 "**** but without any ident (RFC 1413) callback.\n"
4941 "**** This is not for real!\n\n",
4942 sender_host_address);
4944 memset(sender_host_cache, 0, sizeof(sender_host_cache));
4945 if (verify_check_host(&hosts_connection_nolog) == OK)
4946 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
4947 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4949 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4950 because a log line has already been written for all its failure exists
4951 (usually "connection refused: <reason>") and writing another one is
4952 unnecessary clutter. */
4954 if (smtp_start_session())
4956 for (; (reset_point = store_mark()); store_reset(reset_point))
4958 if (smtp_setup_msg() <= 0) break;
4959 if (!receive_msg(FALSE)) break;
4961 return_path = sender_address = NULL;
4962 dnslist_domain = dnslist_matched = NULL;
4963 #ifndef DISABLE_DKIM
4964 dkim_cur_signer = NULL;
4967 deliver_localpart_orig = NULL;
4968 deliver_domain_orig = NULL;
4969 callout_address = sending_ip_address = NULL;
4970 sender_rate = sender_rate_limit = sender_rate_period = NULL;
4974 exim_exit(EXIT_SUCCESS, US"main");
4978 /* Arrange for message reception if recipients or SMTP were specified;
4979 otherwise complain unless a version print (-bV) happened or this is a filter
4980 verification test or info dump.
4981 In the former case, show the configuration file name. */
4983 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4985 if (version_printed)
4987 if (Ustrchr(config_main_filelist, ':'))
4988 printf("Configuration file search path is %s\n", config_main_filelist);
4989 printf("Configuration file is %s\n", config_main_filename);
4990 return EXIT_SUCCESS;
4993 if (info_flag != CMDINFO_NONE)
4995 show_exim_information(info_flag, info_stdout ? stdout : stderr);
4996 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
4999 if (filter_test == FTEST_NONE)
5000 exim_usage(called_as);
5004 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5005 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5006 that we are not called from inetd, because that is rejected above. The
5007 following configuration settings are forced here:
5009 (1) Synchronous delivery (-odi)
5010 (2) Errors to stderr (-oep == -oeq)
5011 (3) No parallel remote delivery
5012 (4) Unprivileged delivery
5014 We don't force overall queueing options because there are several of them;
5015 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5016 to override any SMTP queueing. */
5020 f.synchronous_delivery = TRUE;
5021 arg_error_handling = ERRORS_STDERR;
5022 remote_max_parallel = 1;
5023 deliver_drop_privilege = TRUE;
5024 f.queue_smtp = FALSE;
5025 queue_smtp_domains = NULL;
5027 message_utf8_downconvert = -1; /* convert-if-needed */
5032 /* Prepare to accept one or more new messages on the standard input. When a
5033 message has been read, its id is returned in message_id[]. If doing immediate
5034 delivery, we fork a delivery process for each received message, except for the
5035 last one, where we can save a process switch.
5037 It is only in non-smtp mode that error_handling is allowed to be changed from
5038 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5039 sendmail error modes other than -oem ever actually used? Later: yes.) */
5041 if (!smtp_input) error_handling = arg_error_handling;
5043 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5044 logging being sent down the socket and make an identd call to get the
5047 else if (f.is_inetd)
5049 (void)fclose(stderr);
5050 exim_nullstd(); /* Re-open to /dev/null */
5051 verify_get_ident(IDENT_PORT);
5052 host_build_sender_fullhost();
5053 set_process_info("handling incoming connection from %s via inetd",
5057 /* If the sender host address has been set, build sender_fullhost if it hasn't
5058 already been done (which it will have been for inetd). This caters for the
5059 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5060 so that the test for IP options is skipped for -bs input. */
5062 if (sender_host_address && !sender_fullhost)
5064 host_build_sender_fullhost();
5065 set_process_info("handling incoming connection from %s via -oMa",
5067 f.sender_host_notsocket = TRUE;
5070 /* Otherwise, set the sender host as unknown except for inetd calls. This
5071 prevents host checking in the case of -bs not from inetd and also for -bS. */
5073 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5075 /* If stdout does not exist, then dup stdin to stdout. This can happen
5076 if exim is started from inetd. In this case fd 0 will be set to the socket,
5077 but fd 1 will not be set. This also happens for passed SMTP channels. */
5079 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5081 /* Set up the incoming protocol name and the state of the program. Root is
5082 allowed to force received protocol via the -oMr option above. If we have come
5083 via inetd, the process info has already been set up. We don't set
5084 received_protocol here for smtp input, as it varies according to
5085 batch/HELO/EHLO/AUTH/TLS. */
5089 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5090 smtp_batched_input? "batched " : "",
5091 (sender_address!= NULL)? sender_address : originator_login);
5095 int old_pool = store_pool;
5096 store_pool = POOL_PERM;
5097 if (!received_protocol)
5098 received_protocol = string_sprintf("local%s", called_as);
5099 store_pool = old_pool;
5100 set_process_info("accepting a local non-SMTP message from <%s>",
5104 /* Initialize the session_local_queue-only flag (this will be ignored if
5105 mua_wrapper is set) */
5108 session_local_queue_only = queue_only;
5110 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5111 the spool if so configured. On failure, we must not attempt to send an error
5112 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5113 error code is given.) */
5115 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5116 exim_fail("exim: insufficient disk space\n");
5118 /* If this is smtp input of any kind, real or batched, handle the start of the
5121 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5122 because a log line has already been written for all its failure exists
5123 (usually "connection refused: <reason>") and writing another one is
5124 unnecessary clutter. */
5130 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5131 if (verify_check_host(&hosts_connection_nolog) == OK)
5132 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5133 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5134 if (!smtp_start_session())
5137 exim_exit(EXIT_SUCCESS, US"smtp_start toplevel");
5141 /* Otherwise, set up the input size limit here. */
5145 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5146 if (expand_string_message)
5147 if (thismessage_size_limit == -1)
5148 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5149 "message_size_limit: %s", expand_string_message);
5151 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5152 "message_size_limit: %s", expand_string_message);
5155 /* Loop for several messages when reading SMTP input. If we fork any child
5156 processes, we don't want to wait for them unless synchronous delivery is
5157 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5158 same as SIG_DFL, despite the fact that documentation often lists the default as
5159 "ignore". This is a confusing area. This is what I know:
5161 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5162 processes that complete simply to go away without ever becoming defunct. You
5163 can't then wait for them - but we don't want to wait for them in the
5164 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5165 happen for all OS (e.g. *BSD is different).
5167 But that's not the end of the story. Some (many? all?) systems have the
5168 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5169 has by default, so it seems that the difference is merely one of default
5170 (compare restarting vs non-restarting signals).
5172 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5173 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5174 of the loop below. Paranoia rules.
5176 February 2003: That's *still* not the end of the story. There are now versions
5177 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5178 process then calls waitpid(), a grumble is written to the system log, because
5179 this is logically inconsistent. In other words, it doesn't like the paranoia.
5180 As a consequence of this, the waitpid() below is now excluded if we are sure
5181 that SIG_IGN works. */
5183 if (!f.synchronous_delivery)
5186 struct sigaction act;
5187 act.sa_handler = SIG_IGN;
5188 sigemptyset(&(act.sa_mask));
5189 act.sa_flags = SA_NOCLDWAIT;
5190 sigaction(SIGCHLD, &act, NULL);
5192 signal(SIGCHLD, SIG_IGN);
5196 /* Save the current store pool point, for resetting at the start of
5197 each message, and save the real sender address, if any. */
5199 real_sender_address = sender_address;
5201 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5202 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5207 reset_point = store_mark();
5210 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5211 input and build the recipients list, before calling receive_msg() to read the
5212 message proper. Whatever sender address is given in the SMTP transaction is
5213 often ignored for local senders - we use the actual sender, which is normally
5214 either the underlying user running this process or a -f argument provided by
5215 a trusted caller. It is saved in real_sender_address. The test for whether to
5216 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5221 if ((rc = smtp_setup_msg()) > 0)
5223 if (real_sender_address != NULL &&
5224 !receive_check_set_sender(sender_address))
5226 sender_address = raw_sender = real_sender_address;
5227 sender_address_unrewritten = NULL;
5230 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5231 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5232 the very end. The result of the ACL is ignored (as for other non-SMTP
5233 messages). It is run for its potential side effects. */
5235 if (smtp_batched_input && acl_not_smtp_start != NULL)
5237 uschar *user_msg, *log_msg;
5238 f.enable_dollar_recipients = TRUE;
5239 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5240 &user_msg, &log_msg);
5241 f.enable_dollar_recipients = FALSE;
5244 /* Now get the data for the message */
5246 more = receive_msg(extract_recipients);
5247 if (message_id[0] == 0)
5249 cancel_cutthrough_connection(TRUE, US"receive dropped");
5250 if (more) goto moreloop;
5251 smtp_log_no_mail(); /* Log no mail if configured */
5252 exim_exit(EXIT_FAILURE, US"receive toplevel");
5257 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5258 smtp_log_no_mail(); /* Log no mail if configured */
5259 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS, US"msg setup toplevel");
5263 /* In the non-SMTP case, we have all the information from the command
5264 line, but must process it in case it is in the more general RFC822
5265 format, and in any case, to detect syntax errors. Also, it appears that
5266 the use of comma-separated lists as single arguments is common, so we
5267 had better support them. */
5272 int count = argc - recipients_arg;
5273 uschar **list = argv + recipients_arg;
5275 /* These options cannot be changed dynamically for non-SMTP messages */
5277 f.active_local_sender_retain = local_sender_retain;
5278 f.active_local_from_check = local_from_check;
5280 /* Save before any rewriting */
5282 raw_sender = string_copy(sender_address);
5284 /* Loop for each argument */
5286 for (int i = 0; i < count; i++)
5288 int start, end, domain;
5290 uschar *s = list[i];
5292 /* Loop for each comma-separated address */
5296 BOOL finished = FALSE;
5298 uschar *ss = parse_find_address_end(s, FALSE);
5300 if (*ss == ',') *ss = 0; else finished = TRUE;
5302 /* Check max recipients - if -t was used, these aren't recipients */
5304 if (recipients_max > 0 && ++rcount > recipients_max &&
5305 !extract_recipients)
5306 if (error_handling == ERRORS_STDERR)
5308 fprintf(stderr, "exim: too many recipients\n");
5309 exim_exit(EXIT_FAILURE, US"main");
5313 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5314 errors_sender_rc : EXIT_FAILURE;
5318 BOOL b = allow_utf8_domains;
5319 allow_utf8_domains = TRUE;
5322 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5325 if (string_is_utf8(recipient))
5326 message_smtputf8 = TRUE;
5328 allow_utf8_domains = b;
5331 if (domain == 0 && !f.allow_unqualified_recipient)
5334 errmess = US"unqualified recipient address not allowed";
5337 if (recipient == NULL)
5339 if (error_handling == ERRORS_STDERR)
5341 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5342 string_printing(list[i]), errmess);
5343 exim_exit(EXIT_FAILURE, US"main");
5349 eblock.text1 = string_printing(list[i]);
5350 eblock.text2 = errmess;
5352 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5353 errors_sender_rc : EXIT_FAILURE;
5357 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5360 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5364 /* Show the recipients when debugging */
5368 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5369 if (recipients_list != NULL)
5371 debug_printf("Recipients:\n");
5372 for (int i = 0; i < recipients_count; i++)
5373 debug_printf(" %s\n", recipients_list[i].address);
5377 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5378 ignored; rejecting here would just add complication, and it can just as
5379 well be done later. Allow $recipients to be visible in the ACL. */
5381 if (acl_not_smtp_start)
5383 uschar *user_msg, *log_msg;
5384 f.enable_dollar_recipients = TRUE;
5385 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5386 &user_msg, &log_msg);
5387 f.enable_dollar_recipients = FALSE;
5390 /* Pause for a while waiting for input. If none received in that time,
5391 close the logfile, if we had one open; then if we wait for a long-running
5392 datasource (months, in one use-case) log rotation will not leave us holding
5395 if (!receive_timeout)
5397 struct timeval t = { .tv_sec = 30*60, .tv_usec = 0 }; /* 30 minutes */
5400 FD_ZERO(&r); FD_SET(0, &r);
5401 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
5404 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5405 will just read the headers for the message, and not write anything onto the
5408 message_ended = END_NOTENDED;
5409 more = receive_msg(extract_recipients);
5411 /* more is always FALSE here (not SMTP message) when reading a message
5412 for real; when reading the headers of a message for filter testing,
5413 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5415 if (message_id[0] == 0) exim_exit(EXIT_FAILURE, US"main");
5416 } /* Non-SMTP message reception */
5418 /* If this is a filter testing run, there are headers in store, but
5419 no message on the spool. Run the filtering code in testing mode, setting
5420 the domain to the qualify domain and the local part to the current user,
5421 unless they have been set by options. The prefix and suffix are left unset
5422 unless specified. The the return path is set to to the sender unless it has
5423 already been set from a return-path header in the message. */
5425 if (filter_test != FTEST_NONE)
5427 deliver_domain = (ftest_domain != NULL)?
5428 ftest_domain : qualify_domain_recipient;
5429 deliver_domain_orig = deliver_domain;
5430 deliver_localpart = (ftest_localpart != NULL)?
5431 ftest_localpart : originator_login;
5432 deliver_localpart_orig = deliver_localpart;
5433 deliver_localpart_prefix = ftest_prefix;
5434 deliver_localpart_suffix = ftest_suffix;
5435 deliver_home = originator_home;
5437 if (return_path == NULL)
5439 printf("Return-path copied from sender\n");
5440 return_path = string_copy(sender_address);
5443 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5444 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5446 receive_add_recipient(
5447 string_sprintf("%s%s%s@%s",
5448 (ftest_prefix == NULL)? US"" : ftest_prefix,
5450 (ftest_suffix == NULL)? US"" : ftest_suffix,
5451 deliver_domain), -1);
5453 printf("Recipient = %s\n", recipients_list[0].address);
5454 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
5455 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
5457 if (chdir("/")) /* Get away from wherever the user is running this from */
5459 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5460 exim_exit(EXIT_FAILURE, US"main");
5463 /* Now we run either a system filter test, or a user filter test, or both.
5464 In the latter case, headers added by the system filter will persist and be
5465 available to the user filter. We need to copy the filter variables
5468 if ((filter_test & FTEST_SYSTEM) != 0)
5469 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5470 exim_exit(EXIT_FAILURE, US"main");
5472 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5474 if ((filter_test & FTEST_USER) != 0)
5475 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5476 exim_exit(EXIT_FAILURE, US"main");
5478 exim_exit(EXIT_SUCCESS, US"main");
5481 /* Else act on the result of message reception. We should not get here unless
5482 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5483 will be TRUE. If it is not, check on the number of messages received in this
5486 if (!session_local_queue_only &&
5487 smtp_accept_queue_per_connection > 0 &&
5488 receive_messagecount > smtp_accept_queue_per_connection)
5490 session_local_queue_only = TRUE;
5491 queue_only_reason = 2;
5494 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5495 and queue_only_load is set, check that the load average is below it. If it is
5496 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5497 default), we put the whole session into queue_only mode. It then remains this
5498 way for any subsequent messages on the same SMTP connection. This is a
5499 deliberate choice; even though the load average may fall, it doesn't seem
5500 right to deliver later messages on the same call when not delivering earlier
5501 ones. However, there are odd cases where this is not wanted, so this can be
5502 changed by setting queue_only_load_latch false. */
5504 local_queue_only = session_local_queue_only;
5505 if (!local_queue_only && queue_only_load >= 0)
5507 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5508 if (local_queue_only)
5510 queue_only_reason = 3;
5511 if (queue_only_load_latch) session_local_queue_only = TRUE;
5515 /* If running as an MUA wrapper, all queueing options and freezing options
5519 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5521 /* Log the queueing here, when it will get a message id attached, but
5522 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5525 if (local_queue_only)
5527 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5528 switch(queue_only_reason)
5531 log_write(L_delay_delivery,
5532 LOG_MAIN, "no immediate delivery: more than %d messages "
5533 "received in one connection", smtp_accept_queue_per_connection);
5537 log_write(L_delay_delivery,
5538 LOG_MAIN, "no immediate delivery: load average %.2f",
5539 (double)load_average/1000.0);
5544 else if (f.queue_only_policy || f.deliver_freeze)
5545 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5547 /* Else do the delivery unless the ACL or local_scan() called for queue only
5548 or froze the message. Always deliver in a separate process. A fork failure is
5549 not a disaster, as the delivery will eventually happen on a subsequent queue
5550 run. The search cache must be tidied before the fork, as the parent will
5551 do it before exiting. The child will trigger a lookup failure and
5552 thereby defer the delivery if it tries to use (for example) a cached ldap
5553 connection that the parent has called unbind on. */
5560 if ((pid = fork()) == 0)
5563 close_unwanted(); /* Close unwanted file descriptors and TLS */
5564 exim_nullstd(); /* Ensure std{in,out,err} exist */
5566 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5567 mode, deliver_drop_privilege is forced TRUE). */
5569 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5571 delivery_re_exec(CEE_EXEC_EXIT);
5572 /* Control does not return here. */
5575 /* No need to re-exec */
5577 rc = deliver_message(message_id, FALSE, FALSE);
5579 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5580 ? EXIT_SUCCESS : EXIT_FAILURE);
5585 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5586 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5587 "process: %s", strerror(errno));
5591 release_cutthrough_connection(US"msg passed for delivery");
5593 /* In the parent, wait if synchronous delivery is required. This will
5594 always be the case in MUA wrapper mode. */
5596 if (f.synchronous_delivery)
5599 while (wait(&status) != pid);
5600 if ((status & 0x00ff) != 0)
5601 log_write(0, LOG_MAIN|LOG_PANIC,
5602 "process %d crashed with signal %d while delivering %s",
5603 (int)pid, status & 0x00ff, message_id);
5604 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE, US"main");
5609 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5610 automatically reaps children (see comments above the loop), clear away any
5611 finished subprocesses here, in case there are lots of messages coming in
5612 from the same source. */
5614 #ifndef SIG_IGN_WORKS
5615 while (waitpid(-1, NULL, WNOHANG) > 0);
5619 return_path = sender_address = NULL;
5620 authenticated_sender = NULL;
5621 deliver_localpart_orig = NULL;
5622 deliver_domain_orig = NULL;
5623 deliver_host = deliver_host_address = NULL;
5624 dnslist_domain = dnslist_matched = NULL;
5625 #ifdef WITH_CONTENT_SCAN
5626 malware_name = NULL;
5628 callout_address = NULL;
5629 sending_ip_address = NULL;
5631 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5633 store_reset(reset_point);
5636 exim_exit(EXIT_SUCCESS, US"main"); /* Never returns */
5637 return 0; /* To stop compiler warning */