1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* The main function: entry point, initialization, and high-level control.
11 Also a few functions that don't naturally fit elsewhere. */
16 #if defined(__GLIBC__) && !defined(__UCLIBC__)
17 # include <gnu/libc-version.h>
24 # include <execinfo.h>
28 # include <gnutls/gnutls.h>
29 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
34 extern void init_lookup_list(void);
38 /*************************************************
39 * Function interface to store functions *
40 *************************************************/
42 /* We need some real functions to pass to the PCRE regular expression library
43 for store allocation via Exim's store manager. The normal calls are actually
44 macros that pass over location information to make tracing easier. These
45 functions just interface to the standard macro calls. A good compiler will
46 optimize out the tail recursion and so not make them too expensive. */
49 function_store_malloc(PCRE2_SIZE size, void * tag)
51 return store_malloc((int)size);
55 function_store_free(void * block, void * tag)
57 /* At least some version of pcre2 pass a null pointer */
58 if (block) store_free(block);
63 function_store_get(PCRE2_SIZE size, void * tag)
65 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
69 function_store_nullfree(void * block, void * tag)
76 /*************************************************
77 * Enums for cmdline interface *
78 *************************************************/
80 enum commandline_info { CMDINFO_NONE=0,
81 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
86 /*************************************************
87 * Compile regular expression and panic on fail *
88 *************************************************/
90 /* This function is called when failure to compile a regular expression leads
91 to a panic exit. In other cases, pcre_compile() is called directly. In many
92 cases where this function is used, the results of the compilation are to be
93 placed in long-lived store, so we temporarily reset the store management
94 functions that PCRE uses if the use_malloc flag is set.
97 pattern the pattern to compile
98 caseless TRUE if caseless matching is required
99 use_malloc TRUE if compile into malloc store
101 Returns: pointer to the compiled pattern
105 regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc)
108 int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT;
109 const pcre2_code * yield;
112 if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options,
113 &err, &offset, use_malloc ? pcre_mlc_cmp_ctx : pcre_gen_cmp_ctx)))
116 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
117 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
118 "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern);
128 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
129 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
131 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
132 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
134 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
140 /*************************************************
141 * Execute regular expression and set strings *
142 *************************************************/
144 /* This function runs a regular expression match, and sets up the pointers to
145 the matched substrings. The matched strings are copied so the lifetime of
146 the subject is not a problem.
149 re the compiled expression
150 subject the subject string
151 options additional PCRE options
152 setup if < 0 do full setup
153 if >= 0 setup from setup+1 onwards,
154 excluding the full matched string
156 Returns: TRUE if matched, or FALSE
160 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
162 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
163 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
164 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
167 if ((yield = (res >= 0)))
169 res = pcre2_get_ovector_count(md);
170 expand_nmax = setup < 0 ? 0 : setup + 1;
171 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
174 pcre2_substring_get_bynumber(md, matchnum,
175 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
176 expand_nlength[expand_nmax++] = (int)len;
180 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
183 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
184 debug_printf_indent("pcre2: %s\n", errbuf);
186 /* pcre2_match_data_free(md); gen ctx needs no free */
191 /* Check just for match with regex. Uses the common memory-handling.
195 subject string to be checked
196 slen length of subject; -1 for nul-terminated
197 rptr pointer for matched string, copied, or NULL
199 Return: TRUE for a match.
203 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
205 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
206 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
207 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
208 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
209 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
215 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
218 /* pcre2_match_data_free(md); gen ctx needs no free */
224 /*************************************************
225 * Set up processing details *
226 *************************************************/
228 /* Save a text string for dumping when SIGUSR1 is received.
229 Do checks for overruns.
231 Arguments: format and arguments, as for printf()
236 set_process_info(const char *format, ...)
238 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
243 g = string_fmt_append(&gs, "%5d ", (int)getpid());
245 va_start(ap, format);
246 if (!string_vformat(g, 0, format, ap))
249 g = string_cat(&gs, US"**** string overflowed buffer ****");
251 g = string_catn(g, US"\n", 1);
252 string_from_gstring(g);
253 process_info_len = g->ptr;
254 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
258 /***********************************************
259 * Handler for SIGTERM *
260 ***********************************************/
263 term_handler(int sig)
269 /***********************************************
270 * Handler for SIGSEGV *
271 ***********************************************/
273 #define STACKDUMP_MAX 24
278 void * buf[STACKDUMP_MAX];
280 int nptrs = backtrace(buf, STACKDUMP_MAX);
282 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace\n");
283 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
284 if ((ss = backtrace_symbols(buf, nptrs)))
286 for (int i = 0; i < nptrs; i++)
287 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s\n", ss[i]);
291 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s\n", strerror(errno));
292 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
300 segv_handler(int sig, siginfo_t * info, void * uctx)
302 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
303 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
304 switch (info->si_code)
306 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
307 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
308 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
309 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
312 if (US info->si_addr < US 4096)
313 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
315 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
316 if (process_info_len > 0)
317 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
319 signal(SIGSEGV, SIG_DFL);
324 segv_handler(int sig)
326 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
327 if (process_info_len > 0)
328 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
330 signal(SIGSEGV, SIG_DFL);
336 /*************************************************
337 * Handler for SIGUSR1 *
338 *************************************************/
340 /* SIGUSR1 causes any exim process to write to the process log details of
341 what it is currently doing. It will only be used if the OS is capable of
342 setting up a handler that causes automatic restarting of any system call
343 that is in progress at the time.
345 This function takes care to be signal-safe.
347 Argument: the signal number (SIGUSR1)
352 usr1_handler(int sig)
356 os_restarting_signal(sig, usr1_handler);
358 if (!process_log_path) return;
359 fd = log_open_as_exim(process_log_path);
361 /* If we are neither exim nor root, or if we failed to create the log file,
362 give up. There is not much useful we can do with errors, since we don't want
363 to disrupt whatever is going on outside the signal handler. */
367 (void)write(fd, process_info, process_info_len);
373 /*************************************************
375 *************************************************/
377 /* This handler is enabled most of the time that Exim is running. The handler
378 doesn't actually get used unless alarm() has been called to set a timer, to
379 place a time limit on a system call of some kind. When the handler is run, it
382 There are some other SIGALRM handlers that are used in special cases when more
383 than just a flag setting is required; for example, when reading a message's
384 input. These are normally set up in the code module that uses them, and the
385 SIGALRM handler is reset to this one afterwards.
387 Argument: the signal value (SIGALRM)
392 sigalrm_handler(int sig)
395 os_non_restarting_signal(SIGALRM, sigalrm_handler);
400 /*************************************************
401 * Sleep for a fractional time interval *
402 *************************************************/
404 /* This function is called by millisleep() and exim_wait_tick() to wait for a
405 period of time that may include a fraction of a second. The coding is somewhat
406 tedious. We do not expect setitimer() ever to fail, but if it does, the process
407 will wait for ever, so we panic in this instance. (There was a case of this
408 when a bug in a function that calls milliwait() caused it to pass invalid data.
409 That's when I added the check. :-)
411 We assume it to be not worth sleeping for under 50us; this value will
412 require revisiting as hardware advances. This avoids the issue of
413 a zero-valued timer setting meaning "never fire".
415 Argument: an itimerval structure containing the interval
420 milliwait(struct itimerval *itval)
423 sigset_t old_sigmask;
424 int save_errno = errno;
426 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
428 (void)sigemptyset(&sigmask); /* Empty mask */
429 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
430 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
431 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
432 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
433 "setitimer() failed: %s", strerror(errno));
434 (void)sigfillset(&sigmask); /* All signals */
435 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
436 (void)sigsuspend(&sigmask); /* Until SIGALRM */
437 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
439 sigalrm_seen = FALSE;
445 /*************************************************
446 * Millisecond sleep function *
447 *************************************************/
449 /* The basic sleep() function has a granularity of 1 second, which is too rough
450 in some cases - for example, when using an increasing delay to slow down
453 Argument: number of millseconds
460 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
461 .it_value = {.tv_sec = msec/1000,
462 .tv_usec = (msec % 1000) * 1000}};
468 /*************************************************
469 * Compare microsecond times *
470 *************************************************/
477 Returns: -1, 0, or +1
481 exim_tvcmp(struct timeval *t1, struct timeval *t2)
483 if (t1->tv_sec > t2->tv_sec) return +1;
484 if (t1->tv_sec < t2->tv_sec) return -1;
485 if (t1->tv_usec > t2->tv_usec) return +1;
486 if (t1->tv_usec < t2->tv_usec) return -1;
493 /*************************************************
494 * Clock tick wait function *
495 *************************************************/
497 #ifdef _POSIX_MONOTONIC_CLOCK
498 # ifdef CLOCK_BOOTTIME
499 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
501 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
504 /* Amount EXIM_CLOCK is behind realtime, at startup. */
505 static struct timespec offset_ts;
508 exim_clock_init(void)
511 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
512 (void)gettimeofday(&tv, NULL);
513 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
514 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
515 if (offset_ts.tv_nsec >= 0) return;
517 offset_ts.tv_nsec += 1000*1000*1000;
523 exim_gettime(struct timeval * tv)
525 #ifdef _POSIX_MONOTONIC_CLOCK
526 struct timespec now_ts;
528 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
530 now_ts.tv_sec += offset_ts.tv_sec;
531 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
534 now_ts.tv_nsec -= 1000*1000*1000;
536 tv->tv_sec = now_ts.tv_sec;
537 tv->tv_usec = now_ts.tv_nsec / 1000;
541 (void)gettimeofday(tv, NULL);
545 /* Exim uses a time + a pid to generate a unique identifier in two places: its
546 message IDs, and in file names for maildir deliveries. Because some OS now
547 re-use pids within the same second, sub-second times are now being used.
548 However, for absolute certainty, we must ensure the clock has ticked before
549 allowing the relevant process to complete. At the time of implementation of
550 this code (February 2003), the speed of processors is such that the clock will
551 invariably have ticked already by the time a process has done its job. This
552 function prepares for the time when things are faster - and it also copes with
553 clocks that go backwards.
556 prev_tv A timeval which was used to create uniqueness; its usec field
557 has been rounded down to the value of the resolution.
558 We want to be sure the current time is greater than this.
559 On return, updated to current (rounded down).
560 resolution The resolution that was used to divide the microseconds
561 (1 for maildir, larger for message ids)
567 exim_wait_tick(struct timeval * prev_tv, int resolution)
569 struct timeval now_tv;
570 long int now_true_usec;
572 exim_gettime(&now_tv);
573 now_true_usec = now_tv.tv_usec;
574 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
576 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
578 struct itimerval itval;
579 itval.it_interval.tv_sec = 0;
580 itval.it_interval.tv_usec = 0;
581 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
582 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
584 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
585 negative value for the microseconds is possible only in the case when "now"
586 is more than a second less than "tgt". That means that itval.it_value.tv_sec
587 is greater than zero. The following correction is therefore safe. */
589 if (itval.it_value.tv_usec < 0)
591 itval.it_value.tv_usec += 1000000;
592 itval.it_value.tv_sec -= 1;
595 DEBUG(D_transport|D_receive)
597 if (!f.running_in_test_harness)
599 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
600 prev_tv->tv_sec, (long) prev_tv->tv_usec,
601 now_tv.tv_sec, (long) now_tv.tv_usec);
602 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
603 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
609 /* Be prapared to go around if the kernel does not implement subtick
610 granularity (GNU Hurd) */
612 exim_gettime(&now_tv);
613 now_true_usec = now_tv.tv_usec;
614 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
622 /*************************************************
623 * Call fopen() with umask 777 and adjust mode *
624 *************************************************/
626 /* Exim runs with umask(0) so that files created with open() have the mode that
627 is specified in the open() call. However, there are some files, typically in
628 the spool directory, that are created with fopen(). They end up world-writeable
629 if no precautions are taken. Although the spool directory is not accessible to
630 the world, this is an untidiness. So this is a wrapper function for fopen()
631 that sorts out the mode of the created file.
634 filename the file name
635 options the fopen() options
636 mode the required mode
638 Returns: the fopened FILE or NULL
642 modefopen(const uschar *filename, const char *options, mode_t mode)
644 mode_t saved_umask = umask(0777);
645 FILE *f = Ufopen(filename, options);
646 (void)umask(saved_umask);
647 if (f != NULL) (void)fchmod(fileno(f), mode);
652 /*************************************************
653 * Ensure stdin, stdout, and stderr exist *
654 *************************************************/
656 /* Some operating systems grumble if an exec() happens without a standard
657 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
658 file will be opened and will use these fd values, and then some other bit of
659 code will assume, for example, that it can write error messages to stderr.
660 This function ensures that fds 0, 1, and 2 are open if they do not already
661 exist, by connecting them to /dev/null.
663 This function is also used to ensure that std{in,out,err} exist at all times,
664 so that if any library that Exim calls tries to use them, it doesn't crash.
675 for (int i = 0; i <= 2; i++)
677 if (fstat(i, &statbuf) < 0 && errno == EBADF)
679 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
680 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
681 string_open_failed("/dev/null", NULL));
682 if (devnull != i) (void)dup2(devnull, i);
685 if (devnull > 2) (void)close(devnull);
691 /*************************************************
692 * Close unwanted file descriptors for delivery *
693 *************************************************/
695 /* This function is called from a new process that has been forked to deliver
696 an incoming message, either directly, or using exec.
698 We want any smtp input streams to be closed in this new process. However, it
699 has been observed that using fclose() here causes trouble. When reading in -bS
700 input, duplicate copies of messages have been seen. The files will be sharing a
701 file pointer with the parent process, and it seems that fclose() (at least on
702 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
703 least sometimes. Hence we go for closing the underlying file descriptors.
705 If TLS is active, we want to shut down the TLS library, but without molesting
706 the parent's SSL connection.
708 For delivery of a non-SMTP message, we want to close stdin and stdout (and
709 stderr unless debugging) because the calling process might have set them up as
710 pipes and be waiting for them to close before it waits for the submission
711 process to terminate. If they aren't closed, they hold up the calling process
712 until the initial delivery process finishes, which is not what we want.
714 Exception: We do want it for synchronous delivery!
716 And notwithstanding all the above, if D_resolver is set, implying resolver
717 debugging, leave stdout open, because that's where the resolver writes its
720 When we close stderr (which implies we've also closed stdout), we also get rid
721 of any controlling terminal.
733 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
735 (void)close(fileno(smtp_in));
736 (void)close(fileno(smtp_out));
741 (void)close(0); /* stdin */
742 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
743 if (debug_selector == 0) /* stderr */
745 if (!f.synchronous_delivery)
758 /*************************************************
760 *************************************************/
762 /* This function sets a new uid and gid permanently, optionally calling
763 initgroups() to set auxiliary groups. There are some special cases when running
764 Exim in unprivileged modes. In these situations the effective uid will not be
765 root; if we already have the right effective uid/gid, and don't need to
766 initialize any groups, leave things as they are.
771 igflag TRUE if initgroups() wanted
772 msg text to use in debugging output and failure log
774 Returns: nothing; bombs out on failure
778 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
780 uid_t euid = geteuid();
781 gid_t egid = getegid();
783 if (euid == root_uid || euid != uid || egid != gid || igflag)
785 /* At least one OS returns +1 for initgroups failure, so just check for
790 struct passwd *pw = getpwuid(uid);
792 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
793 "no passwd entry for uid=%ld", (long int)uid);
795 if (initgroups(pw->pw_name, gid) != 0)
796 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
797 (long int)uid, strerror(errno));
800 if (setgid(gid) < 0 || setuid(uid) < 0)
801 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
802 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
805 /* Debugging output included uid/gid and all groups */
809 int group_count, save_errno;
810 gid_t group_list[EXIM_GROUPLIST_SIZE];
811 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
812 (long int)geteuid(), (long int)getegid(), (long int)getpid());
813 group_count = getgroups(nelem(group_list), group_list);
815 debug_printf(" auxiliary group list:");
817 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
818 else if (group_count < 0)
819 debug_printf(" <error: %s>", strerror(save_errno));
820 else debug_printf(" <none>");
828 /*************************************************
830 *************************************************/
832 /* Exim exits via this function so that it always clears up any open
838 Returns: does not return
847 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
848 ">>>>>>>>>>>>>>>>\n",
849 (int)getpid(), process_purpose, rc);
855 exim_underbar_exit(int rc)
859 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
860 ">>>>>>>>>>>>>>>>\n",
861 (int)getpid(), process_purpose, rc);
867 /* Print error string, then die */
869 exim_fail(const char * fmt, ...)
873 vfprintf(stderr, fmt, ap);
877 /* fail if a length is too long */
879 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
881 if (itemlen <= maxlen)
883 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
884 itemlen, maxlen, description);
888 /* only pass through the string item back to the caller if it's short enough */
889 static inline const uschar *
890 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
892 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
896 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
897 of chown()/fchown(). See src/functions.h for more explanation */
899 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
901 int saved_errno = errno; /* from the preceeding chown call */
903 log_write(0, LOG_MAIN|LOG_PANIC,
904 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
905 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
906 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
908 /* I leave this here, commented, in case the "bug"(?) comes up again.
909 It is not an Exim bug, but we can provide a workaround.
915 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
917 if (buf.st_uid == owner && buf.st_gid == group) return 0;
918 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
920 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
928 /*************************************************
929 * Extract port from host address *
930 *************************************************/
932 /* Called to extract the port from the values given to -oMa and -oMi.
933 It also checks the syntax of the address, and terminates it before the
934 port data when a port is extracted.
937 address the address, with possible port on the end
939 Returns: the port, or zero if there isn't one
940 bombs out on a syntax error
944 check_port(uschar *address)
946 int port = host_address_extract_port(address);
947 if (string_is_ip_address(address, NULL) == 0)
948 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
954 /*************************************************
955 * Test/verify an address *
956 *************************************************/
958 /* This function is called by the -bv and -bt code. It extracts a working
959 address from a full RFC 822 address. This isn't really necessary per se, but it
960 has the effect of collapsing source routes.
964 flags flag bits for verify_address()
965 exit_value to be set for failures
971 test_address(uschar *s, int flags, int *exit_value)
973 int start, end, domain;
974 uschar *parse_error = NULL;
975 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
979 fprintf(stdout, "syntax error: %s\n", parse_error);
984 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
985 -1, -1, NULL, NULL, NULL);
986 if (rc == FAIL) *exit_value = 2;
987 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
993 /*************************************************
994 * Show supported features *
995 *************************************************/
998 show_string(BOOL is_stdout, gstring * g)
1000 const uschar * s = string_from_gstring(g);
1002 if (is_stdout) fputs(CCS s, stdout);
1003 else debug_printf("%s", s);
1008 show_db_version(gstring * g)
1010 #ifdef DB_VERSION_STRING
1013 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
1014 g = string_fmt_append(g, " Runtime: %s\n",
1015 db_version(NULL, NULL, NULL));
1018 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
1020 #elif defined(BTREEVERSION) && defined(HASHVERSION)
1022 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
1024 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
1027 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
1028 g = string_cat(g, US"Probably ndbm\n");
1029 #elif defined(USE_TDB)
1030 g = string_cat(g, US"Using tdb\n");
1033 g = string_cat(g, US"Probably GDBM (native mode)\n");
1035 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1042 /* This function is called for -bV/--version and for -d to output the optional
1043 features of the current Exim binary.
1045 Arguments: BOOL, true for stdout else debug channel
1050 show_whats_supported(BOOL is_stdout)
1052 rmark reset_point = store_mark();
1055 DEBUG(D_any) {} else g = show_db_version(g);
1057 g = string_cat(g, US"Support for:");
1058 #ifdef SUPPORT_CRYPTEQ
1059 g = string_cat(g, US" crypteq");
1062 g = string_cat(g, US" iconv()");
1065 g = string_cat(g, US" IPv6");
1067 #ifdef HAVE_SETCLASSRESOURCES
1068 g = string_cat(g, US" use_setclassresources");
1071 g = string_cat(g, US" PAM");
1074 g = string_cat(g, US" Perl");
1076 #ifdef EXPAND_DLFUNC
1077 g = string_cat(g, US" Expand_dlfunc");
1079 #ifdef USE_TCP_WRAPPERS
1080 g = string_cat(g, US" TCPwrappers");
1083 g = string_cat(g, US" GnuTLS");
1086 g = string_cat(g, US" OpenSSL");
1088 #ifndef DISABLE_TLS_RESUME
1089 g = string_cat(g, US" TLS_resume");
1091 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1092 g = string_cat(g, US" translate_ip_address");
1094 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1095 g = string_cat(g, US" move_frozen_messages");
1097 #ifdef WITH_CONTENT_SCAN
1098 g = string_cat(g, US" Content_Scanning");
1101 g = string_cat(g, US" DANE");
1103 #ifndef DISABLE_DKIM
1104 g = string_cat(g, US" DKIM");
1106 #ifdef SUPPORT_DMARC
1107 g = string_cat(g, US" DMARC");
1109 #ifndef DISABLE_DNSSEC
1110 g = string_cat(g, US" DNSSEC");
1112 #ifndef DISABLE_EVENT
1113 g = string_cat(g, US" Event");
1116 g = string_cat(g, US" I18N");
1118 #ifndef DISABLE_OCSP
1119 g = string_cat(g, US" OCSP");
1121 #ifndef DISABLE_PIPE_CONNECT
1122 g = string_cat(g, US" PIPECONNECT");
1124 #ifndef DISABLE_PRDR
1125 g = string_cat(g, US" PRDR");
1127 #ifdef SUPPORT_PROXY
1128 g = string_cat(g, US" PROXY");
1130 #ifndef DISABLE_QUEUE_RAMP
1131 g = string_cat(g, US" Queue_Ramp");
1133 #ifdef SUPPORT_SOCKS
1134 g = string_cat(g, US" SOCKS");
1137 g = string_cat(g, US" SPF");
1139 #if defined(SUPPORT_SRS)
1140 g = string_cat(g, US" SRS");
1144 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1146 #ifdef EXPERIMENTAL_ARC
1147 g = string_cat(g, US" Experimental_ARC");
1149 #ifdef EXPERIMENTAL_BRIGHTMAIL
1150 g = string_cat(g, US" Experimental_Brightmail");
1152 #ifdef EXPERIMENTAL_DCC
1153 g = string_cat(g, US" Experimental_DCC");
1155 #ifdef EXPERIMENTAL_DSN_INFO
1156 g = string_cat(g, US" Experimental_DSN_info");
1158 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1159 g = string_cat(g, US" Experimental_ESMTP_Limits");
1161 #ifdef EXPERIMENTAL_QUEUEFILE
1162 g = string_cat(g, US" Experimental_QUEUEFILE");
1164 g = string_cat(g, US"\n");
1166 g = string_cat(g, US"Lookups (built-in):");
1167 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1168 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1170 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1171 g = string_cat(g, US" cdb");
1173 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1174 g = string_cat(g, US" dbm dbmjz dbmnz");
1176 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1177 g = string_cat(g, US" dnsdb");
1179 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1180 g = string_cat(g, US" dsearch");
1182 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1183 g = string_cat(g, US" ibase");
1185 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1186 g = string_cat(g, US" json");
1188 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1189 g = string_cat(g, US" ldap ldapdn ldapm");
1192 g = string_cat(g, US" lmdb");
1194 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1195 g = string_cat(g, US" mysql");
1197 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1198 g = string_cat(g, US" nis nis0");
1200 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1201 g = string_cat(g, US" nisplus");
1203 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1204 g = string_cat(g, US" oracle");
1206 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1207 g = string_cat(g, US" passwd");
1209 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1210 g = string_cat(g, US" pgsql");
1212 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1213 g = string_cat(g, US" redis");
1215 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1216 g = string_cat(g, US" sqlite");
1218 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1219 g = string_cat(g, US" testdb");
1221 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1222 g = string_cat(g, US" whoson");
1224 g = string_cat(g, US"\n");
1226 g = auth_show_supported(g);
1227 g = route_show_supported(g);
1228 g = transport_show_supported(g);
1230 #ifdef WITH_CONTENT_SCAN
1231 g = malware_show_supported(g);
1233 show_string(is_stdout, g); g = NULL;
1235 if (fixed_never_users[0] > 0)
1238 g = string_cat(g, US"Fixed never_users: ");
1239 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1240 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1241 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1244 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1246 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1248 /* Everything else is details which are only worth reporting when debugging.
1249 Perhaps the tls_version_report should move into this too. */
1253 /* clang defines __GNUC__ (at least, for me) so test for it first */
1254 #if defined(__clang__)
1255 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1256 #elif defined(__GNUC__)
1257 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1261 "? unknown version ?"
1265 g = string_cat(g, US"Compiler: <unknown>\n");
1268 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1269 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1270 __GLIBC__, __GLIBC_MINOR__);
1271 if (__GLIBC_PREREQ(2, 1))
1272 g = string_fmt_append(g, " Runtime: %s\n",
1273 gnu_get_libc_version());
1276 g = show_db_version(g);
1279 g = tls_version_report(g);
1282 g = utf8_version_report(g);
1284 #ifdef SUPPORT_DMARC
1285 g = dmarc_version_report(g);
1288 g = spf_lib_version_report(g);
1291 show_string(is_stdout, g);
1294 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1295 if (authi->version_report)
1296 g = (*authi->version_report)(g);
1298 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1299 characters; unless it's an ancient version of PCRE in which case it
1301 #ifndef PCRE_PRERELEASE
1302 # define PCRE_PRERELEASE
1305 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1308 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1309 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1311 PCRE2_MAJOR, PCRE2_MINOR,
1312 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1316 #undef EXPAND_AND_QUOTE
1318 show_string(is_stdout, g);
1322 for (int i = 0; i < lookup_list_count; i++)
1323 if (lookup_list[i]->version_report)
1324 g = lookup_list[i]->version_report(g);
1325 show_string(is_stdout, g);
1328 #ifdef WHITELIST_D_MACROS
1329 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1331 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1333 #ifdef TRUSTED_CONFIG_LIST
1334 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1336 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1340 show_string(is_stdout, g);
1341 store_reset(reset_point);
1345 /*************************************************
1346 * Show auxiliary information about Exim *
1347 *************************************************/
1350 show_exim_information(enum commandline_info request, FILE *stream)
1355 fprintf(stream, "Oops, something went wrong.\n");
1359 "The -bI: flag takes a string indicating which information to provide.\n"
1360 "If the string is not recognised, you'll get this help (on stderr).\n"
1362 " exim -bI:help this information\n"
1363 " exim -bI:dscp list of known dscp value keywords\n"
1364 " exim -bI:sieve list of supported sieve extensions\n"
1368 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1369 fprintf(stream, "%s\n", *pp);
1372 dscp_list_to_stream(stream);
1378 /*************************************************
1379 * Quote a local part *
1380 *************************************************/
1382 /* This function is used when a sender address or a From: or Sender: header
1383 line is being created from the caller's login, or from an authenticated_id. It
1384 applies appropriate quoting rules for a local part.
1386 Argument: the local part
1387 Returns: the local part, quoted if necessary
1391 local_part_quote(uschar *lpart)
1393 BOOL needs_quote = FALSE;
1396 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1398 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1399 (*t != '.' || t == lpart || t[1] == 0);
1402 if (!needs_quote) return lpart;
1404 g = string_catn(NULL, US"\"", 1);
1408 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1411 g = string_cat(g, lpart);
1414 g = string_catn(g, lpart, nq - lpart);
1415 g = string_catn(g, US"\\", 1);
1416 g = string_catn(g, nq, 1);
1420 g = string_catn(g, US"\"", 1);
1421 return string_from_gstring(g);
1427 /*************************************************
1428 * Load readline() functions *
1429 *************************************************/
1431 /* This function is called from testing executions that read data from stdin,
1432 but only when running as the calling user. Currently, only -be does this. The
1433 function loads the readline() function library and passes back the functions.
1434 On some systems, it needs the curses library, so load that too, but try without
1435 it if loading fails. All this functionality has to be requested at build time.
1438 fn_readline_ptr pointer to where to put the readline pointer
1439 fn_addhist_ptr pointer to where to put the addhistory function
1441 Returns: the dlopen handle or NULL on failure
1445 set_readline(char * (**fn_readline_ptr)(const char *),
1446 void (**fn_addhist_ptr)(const char *))
1449 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1451 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1452 if (dlhandle_curses) dlclose(dlhandle_curses);
1456 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1457 * char * readline (const char *prompt);
1458 * void add_history (const char *string);
1460 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1461 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1464 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1472 /*************************************************
1473 * Get a line from stdin for testing things *
1474 *************************************************/
1476 /* This function is called when running tests that can take a number of lines
1477 of input (for example, -be and -bt). It handles continuations and trailing
1478 spaces. And prompting and a blank line output on eof. If readline() is in use,
1479 the arguments are non-NULL and provide the relevant functions.
1482 fn_readline readline function or NULL
1483 fn_addhist addhist function or NULL
1485 Returns: pointer to dynamic memory, or NULL at end of file
1489 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1492 BOOL had_input = FALSE;
1494 if (!fn_readline) { printf("> "); fflush(stdout); }
1496 for (int i = 0;; i++)
1498 uschar buffer[1024];
1502 char *readline_line = NULL;
1505 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1506 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1507 p = US readline_line;
1512 /* readline() not in use */
1515 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1519 /* Handle the line */
1522 ss = p + Ustrlen(p);
1523 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1526 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1528 g = string_catn(g, p, ss - p);
1531 if (fn_readline) free(readline_line);
1534 /* g can only be NULL if ss==p */
1535 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1538 --g->ptr; /* drop the \ */
1541 if (had_input) return g ? string_from_gstring(g) : US"";
1548 /*************************************************
1549 * Output usage information for the program *
1550 *************************************************/
1552 /* This function is called when there are no recipients
1553 or a specific --help argument was added.
1556 progname information on what name we were called by
1558 Returns: DOES NOT RETURN
1562 exim_usage(uschar *progname)
1565 /* Handle specific program invocation variants */
1566 if (Ustrcmp(progname, US"-mailq") == 0)
1568 "mailq - list the contents of the mail queue\n\n"
1569 "For a list of options, see the Exim documentation.\n");
1571 /* Generic usage - we output this whatever happens */
1573 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1574 "not directly from a shell command line. Options and/or arguments control\n"
1575 "what it does when called. For a list of options, see the Exim documentation.\n");
1580 /*************************************************
1581 * Validate that the macros given are okay *
1582 *************************************************/
1584 /* Typically, Exim will drop privileges if macros are supplied. In some
1585 cases, we want to not do so.
1587 Arguments: opt_D_used - true if the commandline had a "-D" option
1588 Returns: true if trusted, false otherwise
1592 macros_trusted(BOOL opt_D_used)
1594 #ifdef WHITELIST_D_MACROS
1595 uschar *whitelisted, *end, *p, **whites;
1596 int white_count, i, n;
1598 BOOL prev_char_item, found;
1603 #ifndef WHITELIST_D_MACROS
1607 /* We only trust -D overrides for some invoking users:
1608 root, the exim run-time user, the optional config owner user.
1609 I don't know why config-owner would be needed, but since they can own the
1610 config files anyway, there's no security risk to letting them override -D. */
1611 if ( ! ((real_uid == root_uid)
1612 || (real_uid == exim_uid)
1613 #ifdef CONFIGURE_OWNER
1614 || (real_uid == config_uid)
1618 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1622 /* Get a list of macros which are whitelisted */
1623 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1624 prev_char_item = FALSE;
1626 for (p = whitelisted; *p != '\0'; ++p)
1628 if (*p == ':' || isspace(*p))
1633 prev_char_item = FALSE;
1636 if (!prev_char_item)
1637 prev_char_item = TRUE;
1644 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1645 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1650 if (i == white_count)
1652 while (*p != '\0' && p < end)
1658 /* The list of commandline macros should be very short.
1659 Accept the N*M complexity. */
1660 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1663 for (uschar ** w = whites; *w; ++w)
1664 if (Ustrcmp(*w, m->name) == 0)
1671 if (!m->replacement)
1673 if ((len = m->replen) == 0)
1675 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1678 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1684 /*************************************************
1685 * Expansion testing *
1686 *************************************************/
1688 /* Expand and print one item, doing macro-processing.
1691 item line for expansion
1695 expansion_test_line(const uschar * line)
1701 Ustrncpy(big_buffer, line, big_buffer_size);
1702 big_buffer[big_buffer_size-1] = '\0';
1703 len = Ustrlen(big_buffer);
1705 (void) macros_expand(0, &len, &dummy_macexp);
1707 if (isupper(big_buffer[0]))
1709 if (macro_read_assignment(big_buffer))
1710 printf("Defined macro '%s'\n", mlast->name);
1713 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1714 else printf("Failed: %s\n", expand_string_message);
1719 /*************************************************
1720 * Entry point and high-level code *
1721 *************************************************/
1723 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1724 the appropriate action. All the necessary functions are present in the one
1725 binary. I originally thought one should split it up, but it turns out that so
1726 much of the apparatus is needed in each chunk that one might as well just have
1727 it all available all the time, which then makes the coding easier as well.
1730 argc count of entries in argv
1731 argv argument strings, with argv[0] being the program name
1733 Returns: EXIT_SUCCESS if terminated successfully
1734 EXIT_FAILURE otherwise, except when a message has been sent
1735 to the sender, and -oee was given
1739 main(int argc, char **cargv)
1741 uschar **argv = USS cargv;
1742 int arg_receive_timeout = -1;
1743 int arg_smtp_receive_timeout = -1;
1744 int arg_error_handling = error_handling;
1745 int filter_sfd = -1;
1746 int filter_ufd = -1;
1749 int list_queue_option = 0;
1751 int msg_action_arg = -1;
1752 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1753 int queue_only_reason = 0;
1755 int perl_start_option = 0;
1757 int recipients_arg = argc;
1758 int sender_address_domain = 0;
1759 int test_retry_arg = -1;
1760 int test_rewrite_arg = -1;
1761 gid_t original_egid;
1762 BOOL arg_queue_only = FALSE;
1763 BOOL bi_option = FALSE;
1764 BOOL checking = FALSE;
1765 BOOL count_queue = FALSE;
1766 BOOL expansion_test = FALSE;
1767 BOOL extract_recipients = FALSE;
1768 BOOL flag_G = FALSE;
1769 BOOL flag_n = FALSE;
1770 BOOL forced_delivery = FALSE;
1771 BOOL f_end_dot = FALSE;
1772 BOOL deliver_give_up = FALSE;
1773 BOOL list_queue = FALSE;
1774 BOOL list_options = FALSE;
1775 BOOL list_config = FALSE;
1776 BOOL local_queue_only;
1777 BOOL one_msg_action = FALSE;
1778 BOOL opt_D_used = FALSE;
1779 BOOL queue_only_set = FALSE;
1780 BOOL receiving_message = TRUE;
1781 BOOL sender_ident_set = FALSE;
1782 BOOL session_local_queue_only;
1784 BOOL removed_privilege = FALSE;
1785 BOOL usage_wanted = FALSE;
1786 BOOL verify_address_mode = FALSE;
1787 BOOL verify_as_sender = FALSE;
1788 BOOL rcpt_verify_quota = FALSE;
1789 BOOL version_printed = FALSE;
1790 uschar *alias_arg = NULL;
1791 uschar *called_as = US"";
1792 uschar *cmdline_syslog_name = NULL;
1793 uschar *start_queue_run_id = NULL;
1794 uschar *stop_queue_run_id = NULL;
1795 uschar *expansion_test_message = NULL;
1796 const uschar *ftest_domain = NULL;
1797 const uschar *ftest_localpart = NULL;
1798 const uschar *ftest_prefix = NULL;
1799 const uschar *ftest_suffix = NULL;
1800 uschar *log_oneline = NULL;
1801 uschar *malware_test_file = NULL;
1802 uschar *real_sender_address;
1803 uschar *originator_home = US"/";
1807 struct stat statbuf;
1808 pid_t passed_qr_pid = (pid_t)0;
1809 int passed_qr_pipe = -1;
1810 gid_t group_list[EXIM_GROUPLIST_SIZE];
1812 /* For the -bI: flag */
1813 enum commandline_info info_flag = CMDINFO_NONE;
1814 BOOL info_stdout = FALSE;
1816 /* Possible options for -R and -S */
1818 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1820 /* Need to define this in case we need to change the environment in order
1821 to get rid of a bogus time zone. We have to make it char rather than uschar
1822 because some OS define it in /usr/include/unistd.h. */
1824 extern char **environ;
1826 #ifdef MEASURE_TIMING
1827 (void)gettimeofday(×tamp_startup, NULL);
1830 store_init(); /* Initialise the memory allocation susbsystem */
1831 pcre_init(); /* Set up memory handling for pcre */
1833 /* If the Exim user and/or group and/or the configuration file owner/group were
1834 defined by ref:name at build time, we must now find the actual uid/gid values.
1835 This is a feature to make the lives of binary distributors easier. */
1837 #ifdef EXIM_USERNAME
1838 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1841 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1843 /* If ref:name uses a number as the name, route_finduser() returns
1844 TRUE with exim_uid set and pw coerced to NULL. */
1846 exim_gid = pw->pw_gid;
1847 #ifndef EXIM_GROUPNAME
1850 "exim: ref:name should specify a usercode, not a group.\n"
1851 "exim: can't let you get away with it unless you also specify a group.\n");
1855 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1858 #ifdef EXIM_GROUPNAME
1859 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1860 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1863 #ifdef CONFIGURE_OWNERNAME
1864 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1865 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1866 CONFIGURE_OWNERNAME);
1869 /* We default the system_filter_user to be the Exim run-time user, as a
1870 sane non-root value. */
1871 system_filter_uid = exim_uid;
1873 #ifdef CONFIGURE_GROUPNAME
1874 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1875 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1876 CONFIGURE_GROUPNAME);
1879 /* In the Cygwin environment, some initialization used to need doing.
1880 It was fudged in by means of this macro; now no longer but we'll leave
1881 it in case of others. */
1887 /* Check a field which is patched when we are running Exim within its
1888 testing harness; do a fast initial check, and then the whole thing. */
1890 f.running_in_test_harness =
1891 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1892 if (f.running_in_test_harness)
1895 /* Protect against abusive argv[0] */
1896 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1897 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1899 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1900 at the start of a program; however, it seems that some environments do not
1901 follow this. A "strange" locale can affect the formatting of timestamps, so we
1904 setlocale(LC_ALL, "C");
1906 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1908 #ifdef _POSIX_MONOTONIC_CLOCK
1912 /* Set up the default handler for timing using alarm(). */
1914 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1916 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1917 because store_malloc writes a log entry on failure. */
1919 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1920 exim_fail("exim: failed to get store for log buffer\n");
1922 /* Initialize the default log options. */
1924 bits_set(log_selector, log_selector_size, log_default);
1926 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1927 NULL when the daemon is run and the file is closed. We have to use this
1928 indirection, because some systems don't allow writing to the variable "stderr".
1931 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1933 /* Ensure there is a big buffer for temporary use in several places. It is put
1934 in malloc store so that it can be freed for enlargement if necessary. */
1936 big_buffer = store_malloc(big_buffer_size);
1938 /* Set up the handler for the data request signal, and set the initial
1939 descriptive text. */
1941 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1942 set_process_info("initializing");
1943 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1946 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1947 sigaction(SIGSEGV, &act, NULL);
1950 signal(SIGSEGV, segv_handler); /* log faults */
1953 /* If running in a dockerized environment, the TERM signal is only
1954 delegated to the PID 1 if we request it by setting an signal handler */
1955 if (getpid() == 1) signal(SIGTERM, term_handler);
1957 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1958 in the daemon code. For the rest of Exim's uses, we ignore it. */
1960 signal(SIGHUP, SIG_IGN);
1962 /* We don't want to die on pipe errors as the code is written to handle
1963 the write error instead. */
1965 signal(SIGPIPE, SIG_IGN);
1967 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1968 set to SIG_IGN. This causes subprocesses that complete before the parent
1969 process waits for them not to hang around, so when Exim calls wait(), nothing
1970 is there. The wait() code has been made robust against this, but let's ensure
1971 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1972 ending status. We use sigaction rather than plain signal() on those OS where
1973 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1974 problem on AIX with this.) */
1978 struct sigaction act;
1979 act.sa_handler = SIG_DFL;
1980 sigemptyset(&(act.sa_mask));
1982 sigaction(SIGCHLD, &act, NULL);
1985 signal(SIGCHLD, SIG_DFL);
1988 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1993 /* Set up the version number. Set up the leading 'E' for the external form of
1994 message ids, set the pointer to the internal form, and initialize it to
1995 indicate no message being processed. */
1998 message_id_option[0] = '-';
1999 message_id_external = message_id_option + 1;
2000 message_id_external[0] = 'E';
2001 message_id = message_id_external + 1;
2004 /* Set the umask to zero so that any files Exim creates using open() are
2005 created with the modes that it specifies. NOTE: Files created with fopen() have
2006 a problem, which was not recognized till rather late (February 2006). With this
2007 umask, such files will be world writeable. (They are all content scanning files
2008 in the spool directory, which isn't world-accessible, so this is not a
2009 disaster, but it's untidy.) I don't want to change this overall setting,
2010 however, because it will interact badly with the open() calls. Instead, there's
2011 now a function called modefopen() that fiddles with the umask while calling
2016 /* Precompile the regular expression for matching a message id. Keep this in
2017 step with the code that generates ids in the accept.c module. We need to do
2018 this here, because the -M options check their arguments for syntactic validity
2019 using mac_ismsgid, which uses this. */
2022 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
2024 /* Precompile the regular expression that is used for matching an SMTP error
2025 code, possibly extended, at the start of an error message. Note that the
2026 terminating whitespace character is included. */
2029 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2032 #ifdef WHITELIST_D_MACROS
2033 /* Precompile the regular expression used to filter the content of macros
2034 given to -D for permissibility. */
2036 regex_whitelisted_macro =
2037 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2040 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2042 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2043 this seems to be a generally accepted convention, since one finds symbolic
2044 links called "mailq" in standard OS configurations. */
2046 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2047 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2050 receiving_message = FALSE;
2051 called_as = US"-mailq";
2054 /* If the program is called as "rmail" treat it as equivalent to
2055 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2056 i.e. preventing a single dot on a line from terminating the message, and
2057 returning with zero return code, even in cases of error (provided an error
2058 message has been sent). */
2060 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2061 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2064 called_as = US"-rmail";
2065 errors_sender_rc = EXIT_SUCCESS;
2068 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2069 this is a smail convention. */
2071 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2072 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2074 smtp_input = smtp_batched_input = TRUE;
2075 called_as = US"-rsmtp";
2078 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2079 this is a smail convention. */
2081 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2082 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2085 receiving_message = FALSE;
2086 called_as = US"-runq";
2089 /* If the program is called as "newaliases" treat it as equivalent to
2090 "exim -bi"; this is a sendmail convention. */
2092 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2093 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2096 receiving_message = FALSE;
2097 called_as = US"-newaliases";
2100 /* Save the original effective uid for a couple of uses later. It should
2101 normally be root, but in some esoteric environments it may not be. */
2103 original_euid = geteuid();
2104 original_egid = getegid();
2106 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2107 to be the same as the real ones. This makes a difference only if Exim is setuid
2108 (or setgid) to something other than root, which could be the case in some
2109 special configurations. */
2111 real_uid = getuid();
2112 real_gid = getgid();
2114 if (real_uid == root_uid)
2116 if ((rv = setgid(real_gid)))
2117 exim_fail("exim: setgid(%ld) failed: %s\n",
2118 (long int)real_gid, strerror(errno));
2119 if ((rv = setuid(real_uid)))
2120 exim_fail("exim: setuid(%ld) failed: %s\n",
2121 (long int)real_uid, strerror(errno));
2124 /* If neither the original real uid nor the original euid was root, Exim is
2125 running in an unprivileged state. */
2127 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2129 /* For most of the args-parsing we need to use permanent pool memory */
2131 int old_pool = store_pool;
2132 store_pool = POOL_PERM;
2134 /* Scan the program's arguments. Some can be dealt with right away; others are
2135 simply recorded for checking and handling afterwards. Do a high-level switch
2136 on the second character (the one after '-'), to save some effort. */
2138 for (i = 1; i < argc; i++)
2140 BOOL badarg = FALSE;
2141 uschar * arg = argv[i];
2145 /* An argument not starting with '-' is the start of a recipients list;
2146 break out of the options-scanning loop. */
2154 /* An option consisting of -- terminates the options */
2156 if (Ustrcmp(arg, "--") == 0)
2158 recipients_arg = i + 1;
2162 /* Handle flagged options */
2164 switchchar = arg[1];
2167 /* Make all -ex options synonymous with -oex arguments, since that
2168 is assumed by various callers. Also make -qR options synonymous with -R
2169 options, as that seems to be required as well. Allow for -qqR too, and
2170 the same for -S options. */
2172 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2173 Ustrncmp(arg+1, "qR", 2) == 0 ||
2174 Ustrncmp(arg+1, "qS", 2) == 0)
2176 switchchar = arg[2];
2179 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2181 switchchar = arg[3];
2183 f.queue_2stage = TRUE;
2186 /* Make -r synonymous with -f, since it is a documented alias */
2188 else if (arg[1] == 'r') switchchar = 'f';
2190 /* Make -ov synonymous with -v */
2192 else if (Ustrcmp(arg, "-ov") == 0)
2198 /* deal with --option_aliases */
2199 else if (switchchar == '-')
2201 if (Ustrcmp(argrest, "help") == 0)
2203 usage_wanted = TRUE;
2206 else if (Ustrcmp(argrest, "version") == 0)
2213 /* High-level switch on active initial letter */
2218 /* sendmail uses -Ac and -Am to control which .cf file is used;
2221 if (!*argrest) { badarg = TRUE; break; }
2224 BOOL ignore = FALSE;
2229 if (*(argrest + 1) == '\0')
2233 if (!ignore) badarg = TRUE;
2237 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2238 so has no need of it. */
2241 if (!*argrest) i++; /* Skip over the type */
2247 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2251 /* -bd: Run in daemon mode, awaiting SMTP connections.
2252 -bdf: Ditto, but in the foreground.
2255 f.daemon_listen = TRUE;
2256 if (*argrest == 'f') f.background_daemon = FALSE;
2257 else if (*argrest) badarg = TRUE;
2260 /* -be: Run in expansion test mode
2261 -bem: Ditto, but read a message from a file first
2264 expansion_test = checking = TRUE;
2265 if (*argrest == 'm')
2267 if (++i >= argc) { badarg = TRUE; break; }
2268 expansion_test_message = argv[i];
2271 if (*argrest) badarg = TRUE;
2274 /* -bF: Run system filter test */
2276 filter_test |= checking = FTEST_SYSTEM;
2277 if (*argrest) badarg = TRUE;
2278 else if (++i < argc) filter_test_sfile = argv[i];
2279 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2282 /* -bf: Run user filter test
2283 -bfd: Set domain for filter testing
2284 -bfl: Set local part for filter testing
2285 -bfp: Set prefix for filter testing
2286 -bfs: Set suffix for filter testing
2291 filter_test |= checking = FTEST_USER;
2292 if (++i < argc) filter_test_ufile = argv[i];
2293 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2298 exim_fail("exim: string expected after %s\n", arg);
2299 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2300 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2301 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2302 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2307 /* -bh: Host checking - an IP address must follow. */
2309 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2311 if (++i >= argc) { badarg = TRUE; break; }
2312 sender_host_address = string_copy_taint(
2313 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2315 host_checking = checking = f.log_testing_mode = TRUE;
2316 f.host_checking_callout = *argrest == 'c';
2317 message_logs = FALSE;
2322 /* -bi: This option is used by sendmail to initialize *the* alias file,
2323 though it has the -oA option to specify a different file. Exim has no
2324 concept of *the* alias file, but since Sun's YP make script calls
2325 sendmail this way, some support must be provided. */
2327 if (!*argrest) bi_option = TRUE;
2331 /* -bI: provide information, of the type to follow after a colon.
2332 This is an Exim flag. */
2334 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2336 uschar *p = argrest+1;
2337 info_flag = CMDINFO_HELP;
2339 if (strcmpic(p, CUS"sieve") == 0)
2341 info_flag = CMDINFO_SIEVE;
2344 else if (strcmpic(p, CUS"dscp") == 0)
2346 info_flag = CMDINFO_DSCP;
2349 else if (strcmpic(p, CUS"help") == 0)
2355 /* -bm: Accept and deliver message - the default option. Reinstate
2356 receiving_message, which got turned off for all -b options.
2357 -bmalware: test the filename given for malware */
2359 if (!*argrest) receiving_message = TRUE;
2360 else if (Ustrcmp(argrest, "alware") == 0)
2362 if (++i >= argc) { badarg = TRUE; break; }
2364 malware_test_file = argv[i];
2369 /* -bnq: For locally originating messages, do not qualify unqualified
2370 addresses. In the envelope, this causes errors; in header lines they
2373 if (Ustrcmp(argrest, "q") == 0)
2375 f.allow_unqualified_sender = FALSE;
2376 f.allow_unqualified_recipient = FALSE;
2381 /* -bpxx: List the contents of the mail queue, in various forms. If
2382 the option is -bpc, just a queue count is needed. Otherwise, if the
2383 first letter after p is r, then order is random. */
2385 if (*argrest == 'c')
2388 if (*++argrest) badarg = TRUE;
2392 if (*argrest == 'r')
2394 list_queue_option = 8;
2397 else list_queue_option = 0;
2401 /* -bp: List the contents of the mail queue, top-level only */
2405 /* -bpu: List the contents of the mail queue, top-level undelivered */
2407 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2409 /* -bpa: List the contents of the mail queue, including all delivered */
2411 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2413 /* Unknown after -bp[r] */
2419 /* -bP: List the configuration variables given as the address list.
2420 Force -v, so configuration errors get displayed. */
2423 /* -bP config: we need to setup here, because later,
2424 when list_options is checked, the config is read already */
2427 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2430 readconf_save_config(version_string);
2434 list_options = TRUE;
2435 debug_selector |= D_v;
2436 debug_file = stderr;
2440 /* -brt: Test retry configuration lookup */
2442 if (Ustrcmp(argrest, "t") == 0)
2445 test_retry_arg = i + 1;
2449 /* -brw: Test rewrite configuration */
2451 else if (Ustrcmp(argrest, "w") == 0)
2454 test_rewrite_arg = i + 1;
2460 /* -bS: Read SMTP commands on standard input, but produce no replies -
2461 all errors are reported by sending messages. */
2464 smtp_input = smtp_batched_input = receiving_message = TRUE;
2468 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2469 on standard output. */
2471 if (!*argrest) smtp_input = receiving_message = TRUE;
2475 /* -bt: address testing mode */
2478 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2482 /* -bv: verify addresses */
2485 verify_address_mode = checking = f.log_testing_mode = TRUE;
2487 /* -bvs: verify sender addresses */
2489 else if (Ustrcmp(argrest, "s") == 0)
2491 verify_address_mode = checking = f.log_testing_mode = TRUE;
2492 verify_as_sender = TRUE;
2497 /* -bV: Print version string and support details */
2501 printf("Exim version %s #%s built %s\n", version_string,
2502 version_cnumber, version_date);
2503 printf("%s\n", CS version_copyright);
2504 version_printed = TRUE;
2505 show_whats_supported(TRUE);
2506 f.log_testing_mode = TRUE;
2511 /* -bw: inetd wait mode, accept a listening socket as stdin */
2513 f.inetd_wait_mode = TRUE;
2514 f.background_daemon = FALSE;
2515 f.daemon_listen = TRUE;
2517 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2518 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2529 /* -C: change configuration file list; ignore if it isn't really
2530 a change! Enforce a prefix check if required. */
2534 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2535 if (Ustrcmp(config_main_filelist, argrest) != 0)
2537 #ifdef ALT_CONFIG_PREFIX
2539 int len = Ustrlen(ALT_CONFIG_PREFIX);
2540 const uschar *list = argrest;
2542 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2543 while((filename = string_nextinlist(&list, &sep, big_buffer,
2545 if ( ( Ustrlen(filename) < len
2546 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2547 || Ustrstr(filename, "/../") != NULL
2549 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2551 exim_fail("-C Permission denied\n");
2553 if (real_uid != root_uid)
2555 #ifdef TRUSTED_CONFIG_LIST
2557 if (real_uid != exim_uid
2558 #ifdef CONFIGURE_OWNER
2559 && real_uid != config_uid
2562 f.trusted_config = FALSE;
2565 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2568 struct stat statbuf;
2570 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2571 (statbuf.st_uid != root_uid /* owner not root */
2572 #ifdef CONFIGURE_OWNER
2573 && statbuf.st_uid != config_uid /* owner not the special one */
2576 (statbuf.st_gid != root_gid /* group not root */
2577 #ifdef CONFIGURE_GROUP
2578 && statbuf.st_gid != config_gid /* group not the special one */
2580 && (statbuf.st_mode & 020) != 0 /* group writeable */
2582 (statbuf.st_mode & 2) != 0) /* world writeable */
2584 f.trusted_config = FALSE;
2589 /* Well, the trust list at least is up to scratch... */
2591 uschar *trusted_configs[32];
2594 int old_pool = store_pool;
2595 store_pool = POOL_MAIN;
2597 reset_point = store_mark();
2598 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2600 uschar *start = big_buffer, *nl;
2601 while (*start && isspace(*start))
2605 nl = Ustrchr(start, '\n');
2608 trusted_configs[nr_configs++] = string_copy(start);
2609 if (nr_configs == nelem(trusted_configs))
2617 const uschar *list = argrest;
2619 while (f.trusted_config && (filename = string_nextinlist(&list,
2620 &sep, big_buffer, big_buffer_size)))
2622 for (i=0; i < nr_configs; i++)
2623 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2625 if (i == nr_configs)
2627 f.trusted_config = FALSE;
2632 else /* No valid prefixes found in trust_list file. */
2633 f.trusted_config = FALSE;
2634 store_reset(reset_point);
2635 store_pool = old_pool;
2638 else /* Could not open trust_list file. */
2639 f.trusted_config = FALSE;
2642 /* Not root; don't trust config */
2643 f.trusted_config = FALSE;
2647 config_main_filelist = argrest;
2648 f.config_changed = TRUE;
2653 /* -D: set up a macro definition */
2656 #ifdef DISABLE_D_OPTION
2657 exim_fail("exim: -D is not available in this Exim binary\n");
2663 uschar *s = argrest;
2666 while (isspace(*s)) s++;
2668 if (*s < 'A' || *s > 'Z')
2669 exim_fail("exim: macro name set by -D must start with "
2670 "an upper case letter\n");
2672 while (isalnum(*s) || *s == '_')
2674 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2678 if (ptr == 0) { badarg = TRUE; break; }
2679 while (isspace(*s)) s++;
2682 if (*s++ != '=') { badarg = TRUE; break; }
2683 while (isspace(*s)) s++;
2686 for (m = macros_user; m; m = m->next)
2687 if (Ustrcmp(m->name, name) == 0)
2688 exim_fail("exim: duplicated -D in command line\n");
2690 m = macro_create(name, s, TRUE);
2692 if (clmacro_count >= MAX_CLMACROS)
2693 exim_fail("exim: too many -D options on command line\n");
2694 clmacros[clmacro_count++] =
2695 string_sprintf("-D%s=%s", m->name, m->replacement);
2702 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2704 if (Ustrcmp(argrest, "ropcr") == 0)
2706 /* drop_cr = TRUE; */
2709 /* -dp: Set up a debug pretrigger buffer with given size. */
2711 else if (Ustrcmp(argrest, "p") == 0)
2715 debug_pretrigger_setup(argv[i]);
2717 /* -dt: Set a debug trigger selector */
2719 else if (Ustrncmp(argrest, "t=", 2) == 0)
2720 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2722 /* -d: Set debug level (see also -v below).
2723 If -dd is used, debugging subprocesses of the daemon is disabled. */
2727 /* Use an intermediate variable so that we don't set debugging while
2728 decoding the debugging bits. */
2730 unsigned int selector = D_default;
2733 if (*argrest == 'd')
2735 f.debug_daemon = TRUE;
2739 decode_bits(&selector, 1, debug_notall, argrest,
2740 debug_options, debug_options_count, US"debug", 0);
2741 debug_selector = selector;
2746 /* -E: This is a local error message. This option is not intended for
2747 external use at all, but is not restricted to trusted callers because it
2748 does no harm (just suppresses certain error messages) and if Exim is run
2749 not setuid root it won't always be trusted when it generates error
2750 messages using this option. If there is a message id following -E, point
2751 message_reference at it, for logging. */
2754 f.local_error_message = TRUE;
2755 if (mac_ismsgid(argrest)) message_reference = argrest;
2759 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2760 option, so it looks as if historically the -oex options are also callable
2761 without the leading -o. So we have to accept them. Before the switch,
2762 anything starting -oe has been converted to -e. Exim does not support all
2763 of the sendmail error options. */
2766 if (Ustrcmp(argrest, "e") == 0)
2768 arg_error_handling = ERRORS_SENDER;
2769 errors_sender_rc = EXIT_SUCCESS;
2771 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2772 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2773 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2774 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2779 /* -F: Set sender's full name, used instead of the gecos entry from
2780 the password file. Since users can usually alter their gecos entries,
2781 there's no security involved in using this instead. The data can follow
2782 the -F or be in the next argument. */
2786 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2787 originator_name = string_copy_taint(
2788 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2790 f.sender_name_forced = TRUE;
2794 /* -f: Set sender's address - this value is only actually used if Exim is
2795 run by a trusted user, or if untrusted_set_sender is set and matches the
2796 address, except that the null address can always be set by any user. The
2797 test for this happens later, when the value given here is ignored when not
2798 permitted. For an untrusted user, the actual sender is still put in Sender:
2799 if it doesn't match the From: header (unless no_local_from_check is set).
2800 The data can follow the -f or be in the next argument. The -r switch is an
2801 obsolete form of -f but since there appear to be programs out there that
2802 use anything that sendmail has ever supported, better accept it - the
2803 synonymizing is done before the switch above.
2805 At this stage, we must allow domain literal addresses, because we don't
2806 know what the setting of allow_domain_literals is yet. Ditto for trailing
2807 dots and strip_trailing_dot. */
2811 int dummy_start, dummy_end;
2814 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2815 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2817 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2820 uschar * temp = argrest + Ustrlen(argrest) - 1;
2821 while (temp >= argrest && isspace(*temp)) temp--;
2822 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2823 allow_domain_literals = TRUE;
2824 strip_trailing_dot = TRUE;
2826 allow_utf8_domains = TRUE;
2828 if (!(sender_address = parse_extract_address(argrest, &errmess,
2829 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2830 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2832 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2834 message_smtputf8 = string_is_utf8(sender_address);
2835 allow_utf8_domains = FALSE;
2837 allow_domain_literals = FALSE;
2838 strip_trailing_dot = FALSE;
2840 f.sender_address_forced = TRUE;
2844 /* -G: sendmail invocation to specify that it's a gateway submission and
2845 sendmail may complain about problems instead of fixing them.
2846 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2847 not at this time complain about problems. */
2853 /* -h: Set the hop count for an incoming message. Exim does not currently
2854 support this; it always computes it by counting the Received: headers.
2855 To put it in will require a change to the spool header file format. */
2859 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2860 if (!isdigit(*argrest)) badarg = TRUE;
2864 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2865 not to be documented for sendmail but mailx (at least) uses it) */
2868 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2872 /* -L: set the identifier used for syslog; equivalent to setting
2873 syslog_processname in the config file, but needs to be an admin option. */
2877 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2878 if ((sz = Ustrlen(argrest)) > 32)
2879 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2881 exim_fail("exim: the -L syslog name is too short\n");
2882 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2886 receiving_message = FALSE;
2888 /* -MC: continue delivery of another message via an existing open
2889 file descriptor. This option is used for an internal call by the
2890 smtp transport when there is a pending message waiting to go to an
2891 address to which it has got a connection. Five subsequent arguments are
2892 required: transport name, host name, IP address, sequence number, and
2893 message_id. Transports may decline to create new processes if the sequence
2894 number gets too big. The channel is stdin. This (-MC) must be the last
2895 argument. There's a subsequent check that the real-uid is privileged.
2897 If we are running in the test harness. delay for a bit, to let the process
2898 that set this one up complete. This makes for repeatability of the logging,
2901 if (Ustrcmp(argrest, "C") == 0)
2903 union sockaddr_46 interface_sock;
2904 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2907 exim_fail("exim: too many or too few arguments after -MC\n");
2909 if (msg_action_arg >= 0)
2910 exim_fail("exim: incompatible arguments\n");
2912 continue_transport = string_copy_taint(
2913 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2915 continue_hostname = string_copy_taint(
2916 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2918 continue_host_address = string_copy_taint(
2919 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2921 continue_sequence = Uatoi(argv[++i]);
2922 msg_action = MSG_DELIVER;
2923 msg_action_arg = ++i;
2924 forced_delivery = TRUE;
2925 queue_run_pid = passed_qr_pid;
2926 queue_run_pipe = passed_qr_pipe;
2928 if (!mac_ismsgid(argv[i]))
2929 exim_fail("exim: malformed message id %s after -MC option\n",
2932 /* Set up $sending_ip_address and $sending_port, unless proxied */
2934 if (!continue_proxy_cipher)
2935 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2937 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2940 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2943 testharness_pause_ms(500);
2947 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2951 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2952 precedes -MC (see above). The flag indicates that the host to which
2953 Exim is connected has accepted an AUTH sequence. */
2955 case 'A': f.smtp_authenticated = TRUE; break;
2957 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2958 that exim is connected to supports the esmtp extension DSN */
2960 case 'D': smtp_peer_options |= OPTION_DSN; break;
2962 /* -MCd: for debug, set a process-purpose string */
2964 case 'd': if (++i < argc)
2965 process_purpose = string_copy_taint(
2966 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2971 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2972 from the commandline should be tainted - but we will need an untainted
2973 value for the spoolfile when doing a -odi delivery process. */
2975 case 'G': if (++i < argc) queue_name = string_copy_taint(
2976 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2981 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2983 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2985 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2986 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2987 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2989 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2991 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2996 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2997 it preceded -MC (see above) */
2999 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3001 #ifdef SUPPORT_SOCKS
3002 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3003 case 'p': proxy_session = TRUE;
3006 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3009 proxy_local_port = Uatoi(argv[i]);
3012 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3015 proxy_external_port = Uatoi(argv[i]);
3021 /* -MCQ: pass on the pid of the queue-running process that started
3022 this chain of deliveries and the fd of its synchronizing pipe; this
3023 is useful only when it precedes -MC (see above) */
3025 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3027 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3031 /* -MCq: do a quota check on the given recipient for the given size
3032 of message. Separate from -MC. */
3033 case 'q': rcpt_verify_quota = TRUE;
3034 if (++i < argc) message_size = Uatoi(argv[i]);
3038 /* -MCS: set the smtp_use_size flag; this is useful only when it
3039 precedes -MC (see above) */
3041 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3044 /* -MCs: used with -MCt; SNI was sent */
3045 /* -MCr: ditto, DANE */
3048 case 's': if (++i < argc)
3050 continue_proxy_sni = string_copy_taint(
3051 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3053 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3058 /* -MCt: similar to -MCT below but the connection is still open
3059 via a proxy process which handles the TLS context and coding.
3060 Require three arguments for the proxied local address and port,
3061 and the TLS cipher. */
3063 case 't': if (++i < argc)
3064 sending_ip_address = string_copy_taint(
3065 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3069 sending_port = (int)(Uatol(argv[i]));
3072 continue_proxy_cipher = string_copy_taint(
3073 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3078 /* -MCT: set the tls_offered flag; this is useful only when it
3079 precedes -MC (see above). The flag indicates that the host to which
3080 Exim is connected has offered TLS support. */
3082 case 'T': smtp_peer_options |= OPTION_TLS; break;
3085 default: badarg = TRUE; break;
3090 /* -M[x]: various operations on the following list of message ids:
3091 -M deliver the messages, ignoring next retry times and thawing
3092 -Mc deliver the messages, checking next retry times, no thawing
3093 -Mf freeze the messages
3094 -Mg give up on the messages
3095 -Mt thaw the messages
3096 -Mrm remove the messages
3097 In the above cases, this must be the last option. There are also the
3098 following options which are followed by a single message id, and which
3099 act on that message. Some of them use the "recipient" addresses as well.
3100 -Mar add recipient(s)
3101 -MG move to a different queue
3102 -Mmad mark all recipients delivered
3103 -Mmd mark recipients(s) delivered
3105 -Mset load a message for use with -be
3107 -Mvc show copy (of whole message, in RFC 2822 format)
3114 msg_action = MSG_DELIVER;
3115 forced_delivery = f.deliver_force_thaw = TRUE;
3117 else if (Ustrcmp(argrest, "ar") == 0)
3119 msg_action = MSG_ADD_RECIPIENT;
3120 one_msg_action = TRUE;
3122 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3123 else if (Ustrcmp(argrest, "es") == 0)
3125 msg_action = MSG_EDIT_SENDER;
3126 one_msg_action = TRUE;
3128 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3129 else if (Ustrcmp(argrest, "g") == 0)
3131 msg_action = MSG_DELIVER;
3132 deliver_give_up = TRUE;
3134 else if (Ustrcmp(argrest, "G") == 0)
3136 msg_action = MSG_SETQUEUE;
3137 queue_name_dest = string_copy_taint(
3138 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3141 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3142 else if (Ustrcmp(argrest, "md") == 0)
3144 msg_action = MSG_MARK_DELIVERED;
3145 one_msg_action = TRUE;
3147 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3148 else if (Ustrcmp(argrest, "set") == 0)
3150 msg_action = MSG_LOAD;
3151 one_msg_action = TRUE;
3153 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3154 else if (Ustrcmp(argrest, "vb") == 0)
3156 msg_action = MSG_SHOW_BODY;
3157 one_msg_action = TRUE;
3159 else if (Ustrcmp(argrest, "vc") == 0)
3161 msg_action = MSG_SHOW_COPY;
3162 one_msg_action = TRUE;
3164 else if (Ustrcmp(argrest, "vh") == 0)
3166 msg_action = MSG_SHOW_HEADER;
3167 one_msg_action = TRUE;
3169 else if (Ustrcmp(argrest, "vl") == 0)
3171 msg_action = MSG_SHOW_LOG;
3172 one_msg_action = TRUE;
3174 else { badarg = TRUE; break; }
3176 /* All the -Mxx options require at least one message id. */
3178 msg_action_arg = i + 1;
3179 if (msg_action_arg >= argc)
3180 exim_fail("exim: no message ids given after %s option\n", arg);
3182 /* Some require only message ids to follow */
3184 if (!one_msg_action)
3186 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3187 exim_fail("exim: malformed message id %s after %s option\n",
3189 goto END_ARG; /* Remaining args are ids */
3192 /* Others require only one message id, possibly followed by addresses,
3193 which will be handled as normal arguments. */
3197 if (!mac_ismsgid(argv[msg_action_arg]))
3198 exim_fail("exim: malformed message id %s after %s option\n",
3199 argv[msg_action_arg], arg);
3205 /* Some programs seem to call the -om option without the leading o;
3206 for sendmail it askes for "me too". Exim always does this. */
3209 if (*argrest) badarg = TRUE;
3213 /* -N: don't do delivery - a debugging option that stops transports doing
3214 their thing. It implies debugging at the D_v level. */
3219 f.dont_deliver = TRUE;
3220 debug_selector |= D_v;
3221 debug_file = stderr;
3227 /* -n: This means "don't alias" in sendmail, apparently.
3228 For normal invocations, it has no effect.
3229 It may affect some other options. */
3235 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3236 option to the specified value. This form uses long names. We need to handle
3237 -O option=value and -Ooption=value. */
3242 exim_fail("exim: string expected after -O\n");
3248 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3251 if (!*(alias_arg = argrest))
3252 if (i+1 < argc) alias_arg = argv[++i];
3253 else exim_fail("exim: string expected after -oA\n");
3256 /* -oB: Set a connection message max value for remote deliveries */
3259 uschar * p = argrest;
3261 if (i+1 < argc && isdigit((argv[i+1][0])))
3265 connection_max_messages = 1;
3272 exim_fail("exim: number expected after -oB\n");
3273 connection_max_messages = Uatoi(p);
3278 /* -odb: background delivery */
3281 if (Ustrcmp(argrest, "b") == 0)
3283 f.synchronous_delivery = FALSE;
3284 arg_queue_only = FALSE;
3285 queue_only_set = TRUE;
3288 /* -odd: testsuite-only: add no inter-process delays */
3290 else if (Ustrcmp(argrest, "d") == 0)
3291 f.testsuite_delays = FALSE;
3293 /* -odf: foreground delivery (smail-compatible option); same effect as
3294 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3297 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3299 f.synchronous_delivery = TRUE;
3300 arg_queue_only = FALSE;
3301 queue_only_set = TRUE;
3304 /* -odq: queue only */
3306 else if (Ustrcmp(argrest, "q") == 0)
3308 f.synchronous_delivery = FALSE;
3309 arg_queue_only = TRUE;
3310 queue_only_set = TRUE;
3313 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3314 but no remote delivery */
3316 else if (Ustrcmp(argrest, "qs") == 0)
3318 f.queue_smtp = TRUE;
3319 arg_queue_only = FALSE;
3320 queue_only_set = TRUE;
3325 /* -oex: Sendmail error flags. As these are also accepted without the
3326 leading -o prefix, for compatibility with vacation and other callers,
3327 they are handled with -e above. */
3329 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3330 -oitrue: Another sendmail syntax for the same */
3333 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3338 /* -oM*: Set various characteristics for an incoming message; actually
3339 acted on for trusted callers only. */
3344 exim_fail("exim: data expected after -oM%s\n", argrest);
3346 /* -oMa: Set sender host address */
3348 if (Ustrcmp(argrest, "a") == 0)
3349 sender_host_address = string_copy_taint(
3350 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3353 /* -oMaa: Set authenticator name */
3355 else if (Ustrcmp(argrest, "aa") == 0)
3356 sender_host_authenticated = string_copy_taint(
3357 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3360 /* -oMas: setting authenticated sender */
3362 else if (Ustrcmp(argrest, "as") == 0)
3363 authenticated_sender = string_copy_taint(
3364 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3367 /* -oMai: setting authenticated id */
3369 else if (Ustrcmp(argrest, "ai") == 0)
3370 authenticated_id = string_copy_taint(
3371 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3374 /* -oMi: Set incoming interface address */
3376 else if (Ustrcmp(argrest, "i") == 0)
3377 interface_address = string_copy_taint(
3378 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3381 /* -oMm: Message reference */
3383 else if (Ustrcmp(argrest, "m") == 0)
3385 if (!mac_ismsgid(argv[i+1]))
3386 exim_fail("-oMm must be a valid message ID\n");
3387 if (!f.trusted_config)
3388 exim_fail("-oMm must be called by a trusted user/config\n");
3389 message_reference = argv[++i];
3392 /* -oMr: Received protocol */
3394 else if (Ustrcmp(argrest, "r") == 0)
3396 if (received_protocol)
3397 exim_fail("received_protocol is set already\n");
3399 received_protocol = string_copy_taint(
3400 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3403 /* -oMs: Set sender host name */
3405 else if (Ustrcmp(argrest, "s") == 0)
3406 sender_host_name = string_copy_taint(
3407 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3410 /* -oMt: Set sender ident */
3412 else if (Ustrcmp(argrest, "t") == 0)
3414 sender_ident_set = TRUE;
3415 sender_ident = string_copy_taint(
3416 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3420 /* Else a bad argument */
3427 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3428 seem to call this as -m (undocumented), so that is also accepted (see
3430 /* -oo: An ancient flag for old-style addresses which still seems to
3431 crop up in some calls (see in SCO). */
3435 if (*argrest) badarg = TRUE;
3438 /* -oP <name>: set pid file path for daemon
3439 -oPX: delete pid file of daemon */
3442 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3443 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3444 "(uid=%d euid=%d | %d)\n",
3445 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3446 if (!*argrest) override_pid_file_path = argv[++i];
3447 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3452 /* -or <n>: set timeout for non-SMTP acceptance
3453 -os <n>: set timeout for SMTP acceptance */
3458 int * tp = argrest[-1] == 'r'
3459 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3461 *tp = readconf_readtime(argrest, 0, FALSE);
3462 else if (i+1 < argc)
3463 *tp = readconf_readtime(argv[++i], 0, FALSE);
3466 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3470 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3471 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3474 if (*argrest) badarg = TRUE;
3475 else override_local_interfaces = string_copy_taint(
3476 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3480 /* -oY: Override creation of daemon notifier socket */
3483 if (*argrest) badarg = TRUE;
3484 else notifier_socket = NULL;
3487 /* Unknown -o argument */
3495 /* -ps: force Perl startup; -pd force delayed Perl startup */
3499 if (*argrest == 's' && argrest[1] == 0)
3501 perl_start_option = 1;
3504 if (*argrest == 'd' && argrest[1] == 0)
3506 perl_start_option = -1;
3511 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3512 which sets the host protocol and host name */
3515 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3519 uschar * hn = Ustrchr(argrest, ':');
3521 if (received_protocol)
3522 exim_fail("received_protocol is set already\n");
3525 received_protocol = string_copy_taint(
3526 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3530 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3531 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3532 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3539 receiving_message = FALSE;
3540 if (queue_interval >= 0)
3541 exim_fail("exim: -q specified more than once\n");
3543 /* -qq...: Do queue runs in a 2-stage manner */
3545 if (*argrest == 'q')
3547 f.queue_2stage = TRUE;
3551 /* -qi...: Do only first (initial) deliveries */
3553 if (*argrest == 'i')
3555 f.queue_run_first_delivery = TRUE;
3559 /* -qf...: Run the queue, forcing deliveries
3560 -qff..: Ditto, forcing thawing as well */
3562 if (*argrest == 'f')
3564 f.queue_run_force = TRUE;
3565 if (*++argrest == 'f')
3567 f.deliver_force_thaw = TRUE;
3572 /* -q[f][f]l...: Run the queue only on local deliveries */
3574 if (*argrest == 'l')
3576 f.queue_run_local = TRUE;
3580 /* -q[f][f][l][G<name>]... Work on the named queue */
3582 if (*argrest == 'G')
3585 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3586 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3587 queue_name = string_copyn(argrest, i);
3589 if (*argrest == '/') argrest++;
3592 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3593 only, optionally named, optionally starting from a given message id. */
3595 if (!(list_queue || count_queue))
3597 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3600 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3601 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3602 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3603 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3606 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3607 forced, optionally local only, optionally named. */
3609 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3611 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3615 case 'R': /* Synonymous with -qR... */
3617 const uschar *tainted_selectstr;
3619 receiving_message = FALSE;
3621 /* -Rf: As -R (below) but force all deliveries,
3622 -Rff: Ditto, but also thaw all frozen messages,
3623 -Rr: String is regex
3624 -Rrf: Regex and force
3625 -Rrff: Regex and force and thaw
3627 in all cases provided there are no further characters in this
3631 for (int i = 0; i < nelem(rsopts); i++)
3632 if (Ustrcmp(argrest, rsopts[i]) == 0)
3634 if (i != 2) f.queue_run_force = TRUE;
3635 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3636 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3637 argrest += Ustrlen(rsopts[i]);
3640 /* -R: Set string to match in addresses for forced queue run to
3641 pick out particular messages. */
3643 /* Avoid attacks from people providing very long strings, and do so before
3646 tainted_selectstr = argrest;
3647 else if (i+1 < argc)
3648 tainted_selectstr = argv[++i];
3650 exim_fail("exim: string expected after -R\n");
3651 deliver_selectstring = string_copy_taint(
3652 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3657 /* -r: an obsolete synonym for -f (see above) */
3660 /* -S: Like -R but works on sender. */
3662 case 'S': /* Synonymous with -qS... */
3664 const uschar *tainted_selectstr;
3666 receiving_message = FALSE;
3668 /* -Sf: As -S (below) but force all deliveries,
3669 -Sff: Ditto, but also thaw all frozen messages,
3670 -Sr: String is regex
3671 -Srf: Regex and force
3672 -Srff: Regex and force and thaw
3674 in all cases provided there are no further characters in this
3678 for (int i = 0; i < nelem(rsopts); i++)
3679 if (Ustrcmp(argrest, rsopts[i]) == 0)
3681 if (i != 2) f.queue_run_force = TRUE;
3682 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3683 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3684 argrest += Ustrlen(rsopts[i]);
3687 /* -S: Set string to match in addresses for forced queue run to
3688 pick out particular messages. */
3691 tainted_selectstr = argrest;
3692 else if (i+1 < argc)
3693 tainted_selectstr = argv[++i];
3695 exim_fail("exim: string expected after -S\n");
3696 deliver_selectstring_sender = string_copy_taint(
3697 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3702 /* -Tqt is an option that is exclusively for use by the testing suite.
3703 It is not recognized in other circumstances. It allows for the setting up
3704 of explicit "queue times" so that various warning/retry things can be
3705 tested. Otherwise variability of clock ticks etc. cause problems. */
3708 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3709 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3714 /* -t: Set flag to extract recipients from body of message. */
3717 if (!*argrest) extract_recipients = TRUE;
3719 /* -ti: Set flag to extract recipients from body of message, and also
3720 specify that dot does not end the message. */
3722 else if (Ustrcmp(argrest, "i") == 0)
3724 extract_recipients = TRUE;
3728 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3731 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3738 /* -U: This means "initial user submission" in sendmail, apparently. The
3739 doc claims that in future sendmail may refuse syntactically invalid
3740 messages instead of fixing them. For the moment, we just ignore it. */
3746 /* -v: verify things - this is a very low-level debugging */
3751 debug_selector |= D_v;
3752 debug_file = stderr;
3758 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3760 The -x flag tells the sendmail command that mail from a local
3761 mail program has National Language Support (NLS) extended characters
3762 in the body of the mail item. The sendmail command can send mail with
3763 extended NLS characters across networks that normally corrupts these
3766 As Exim is 8-bit clean, it just ignores this flag. */
3769 if (*argrest) badarg = TRUE;
3772 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3773 logs to that file. We swallow the parameter and otherwise ignore it. */
3778 exim_fail("exim: string expected after -X\n");
3781 /* -z: a line of text to log */
3786 log_oneline = string_copy_taint(
3787 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3790 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3793 /* All other initial characters are errors */
3798 } /* End of high-level switch statement */
3800 /* Failed to recognize the option, or syntax error */
3803 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3804 "option %s\n", arg);
3808 /* If -R or -S have been specified without -q, assume a single queue run. */
3810 if ( (deliver_selectstring || deliver_selectstring_sender)
3811 && queue_interval < 0)
3816 store_pool = old_pool;
3819 /* If usage_wanted is set we call the usage function - which never returns */
3820 if (usage_wanted) exim_usage(called_as);
3822 /* Arguments have been processed. Check for incompatibilities. */
3823 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3824 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3825 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3826 || filter_test != FTEST_NONE
3827 || msg_action_arg > 0 && !one_msg_action
3829 || ( msg_action_arg > 0
3830 && ( f.daemon_listen || queue_interval > 0 || list_options
3831 || checking && msg_action != MSG_LOAD
3832 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3834 || ( (f.daemon_listen || queue_interval > 0)
3835 && ( sender_address || list_options || list_queue || checking
3838 || f.daemon_listen && queue_interval == 0
3839 || f.inetd_wait_mode && queue_interval >= 0
3841 && ( checking || smtp_input || extract_recipients
3842 || filter_test != FTEST_NONE || bi_option
3844 || ( verify_address_mode
3845 && ( f.address_test_mode || smtp_input || extract_recipients
3846 || filter_test != FTEST_NONE || bi_option
3848 || ( f.address_test_mode
3849 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3853 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3855 || deliver_selectstring && queue_interval < 0
3856 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3858 exim_fail("exim: incompatible command-line options or arguments\n");
3860 /* If debugging is set up, set the file and the file descriptor to pass on to
3861 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3862 to run in the foreground. */
3864 if (debug_selector != 0)
3866 debug_file = stderr;
3867 debug_fd = fileno(debug_file);
3868 f.background_daemon = FALSE;
3869 testharness_pause_ms(100); /* lets caller finish */
3870 if (debug_selector != D_v) /* -v only doesn't show this */
3872 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3873 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3875 if (!version_printed)
3876 show_whats_supported(FALSE);
3880 /* When started with root privilege, ensure that the limits on the number of
3881 open files and the number of processes (where that is accessible) are
3882 sufficiently large, or are unset, in case Exim has been called from an
3883 environment where the limits are screwed down. Not all OS have the ability to
3884 change some of these limits. */
3888 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3894 #ifdef RLIMIT_NOFILE
3895 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3897 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3899 rlp.rlim_cur = rlp.rlim_max = 0;
3902 /* I originally chose 1000 as a nice big number that was unlikely to
3903 be exceeded. It turns out that some older OS have a fixed upper limit of
3906 if (rlp.rlim_cur < 1000)
3908 rlp.rlim_cur = rlp.rlim_max = 1000;
3909 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3911 rlp.rlim_cur = rlp.rlim_max = 256;
3912 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3913 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3920 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3922 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3924 rlp.rlim_cur = rlp.rlim_max = 0;
3927 # ifdef RLIM_INFINITY
3928 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3930 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3932 if (rlp.rlim_cur < 1000)
3934 rlp.rlim_cur = rlp.rlim_max = 1000;
3936 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3937 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3943 /* Exim is normally entered as root (but some special configurations are
3944 possible that don't do this). However, it always spins off sub-processes that
3945 set their uid and gid as required for local delivery. We don't want to pass on
3946 any extra groups that root may belong to, so we want to get rid of them all at
3949 We need to obey setgroups() at this stage, before possibly giving up root
3950 privilege for a changed configuration file, but later on we might need to
3951 check on the additional groups for the admin user privilege - can't do that
3952 till after reading the config, which might specify the exim gid. Therefore,
3953 save the group list here first. */
3955 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3956 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3958 /* There is a fundamental difference in some BSD systems in the matter of
3959 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3960 known not to be different. On the "different" systems there is a single group
3961 list, and the first entry in it is the current group. On all other versions of
3962 Unix there is a supplementary group list, which is in *addition* to the current
3963 group. Consequently, to get rid of all extraneous groups on a "standard" system
3964 you pass over 0 groups to setgroups(), while on a "different" system you pass
3965 over a single group - the current group, which is always the first group in the
3966 list. Calling setgroups() with zero groups on a "different" system results in
3967 an error return. The following code should cope with both types of system.
3969 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3970 the "setgroups() with zero groups" - and changes the egid.
3971 Thanks to that we had to stash the original_egid above, for use below
3972 in the call to exim_setugid().
3974 However, if this process isn't running as root, setgroups() can't be used
3975 since you have to be root to run it, even if throwing away groups.
3976 Except, sigh, for Hurd - where you can.
3977 Not being root here happens only in some unusual configurations. */
3980 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3981 && setgroups(0, NULL) != 0
3983 && setgroups(1, group_list) != 0)
3984 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3986 /* If the configuration file name has been altered by an argument on the
3987 command line (either a new file name or a macro definition) and the caller is
3988 not root, or if this is a filter testing run, remove any setuid privilege the
3989 program has and run as the underlying user.
3991 The exim user is locked out of this, which severely restricts the use of -C
3994 Otherwise, set the real ids to the effective values (should be root unless run
3995 from inetd, which it can either be root or the exim uid, if one is configured).
3997 There is a private mechanism for bypassing some of this, in order to make it
3998 possible to test lots of configurations automatically, without having either to
3999 recompile each time, or to patch in an actual configuration file name and other
4000 values (such as the path name). If running in the test harness, pretend that
4001 configuration file changes and macro definitions haven't happened. */
4004 (!f.trusted_config || /* Config changed, or */
4005 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4006 real_uid != root_uid && /* Not root, and */
4007 !f.running_in_test_harness /* Not fudged */
4009 expansion_test /* expansion testing */
4011 filter_test != FTEST_NONE) /* Filter testing */
4013 setgroups(group_count, group_list);
4014 exim_setugid(real_uid, real_gid, FALSE,
4015 US"-C, -D, -be or -bf forces real uid");
4016 removed_privilege = TRUE;
4018 /* In the normal case when Exim is called like this, stderr is available
4019 and should be used for any logging information because attempts to write
4020 to the log will usually fail. To arrange this, we unset really_exim. However,
4021 if no stderr is available there is no point - we might as well have a go
4022 at the log (if it fails, syslog will be written).
4024 Note that if the invoker is Exim, the logs remain available. Messing with
4025 this causes unlogged successful deliveries. */
4027 if (log_stderr && real_uid != exim_uid)
4028 f.really_exim = FALSE;
4031 /* Privilege is to be retained for the moment. It may be dropped later,
4032 depending on the job that this Exim process has been asked to do. For now, set
4033 the real uid to the effective so that subsequent re-execs of Exim are done by a
4037 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4039 /* If testing a filter, open the file(s) now, before wasting time doing other
4040 setups and reading the message. */
4042 if (filter_test & FTEST_SYSTEM)
4043 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4044 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4047 if (filter_test & FTEST_USER)
4048 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4049 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4052 /* Initialise lookup_list
4053 If debugging, already called above via version reporting.
4054 In either case, we initialise the list of available lookups while running
4055 as root. All dynamically modules are loaded from a directory which is
4056 hard-coded into the binary and is code which, if not a module, would be
4057 part of Exim already. Ability to modify the content of the directory
4058 is equivalent to the ability to modify a setuid binary!
4060 This needs to happen before we read the main configuration. */
4063 /*XXX this excrescence could move to the testsuite standard config setup file */
4065 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4068 /* Read the main runtime configuration data; this gives up if there
4069 is a failure. It leaves the configuration file open so that the subsequent
4070 configuration data for delivery can be read if needed.
4072 NOTE: immediately after opening the configuration file we change the working
4073 directory to "/"! Later we change to $spool_directory. We do it there, because
4074 during readconf_main() some expansion takes place already. */
4076 /* Store the initial cwd before we change directories. Can be NULL if the
4077 dir has already been unlinked. */
4078 initial_cwd = os_getcwd(NULL, 0);
4079 if (!initial_cwd && errno)
4080 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4082 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4083 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4086 -be[m] expansion test -
4087 -b[fF] filter test new
4089 -bmalware malware_test_file new
4091 -brw rewrite test new
4093 -bv[s] address verify -
4095 -bP <option> (except -bP config, which sets list_config)
4097 If any of these options is set, we suppress warnings about configuration
4098 issues (currently about tls_advertise_hosts and keep_environment not being
4102 int old_pool = store_pool;
4103 #ifdef MEASURE_TIMING
4104 struct timeval t0, diff;
4105 (void)gettimeofday(&t0, NULL);
4108 store_pool = POOL_CONFIG;
4109 readconf_main(checking || list_options);
4110 store_pool = old_pool;
4112 #ifdef MEASURE_TIMING
4113 report_time_since(&t0, US"readconf_main (delta)");
4117 /* Now in directory "/" */
4119 if (cleanup_environment() == FALSE)
4120 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4123 /* If an action on specific messages is requested, or if a daemon or queue
4124 runner is being started, we need to know if Exim was called by an admin user.
4125 This is the case if the real user is root or exim, or if the real group is
4126 exim, or if one of the supplementary groups is exim or a group listed in
4127 admin_groups. We don't fail all message actions immediately if not admin_user,
4128 since some actions can be performed by non-admin users. Instead, set admin_user
4129 for later interrogation. */
4131 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4132 f.admin_user = TRUE;
4134 for (int i = 0; i < group_count && !f.admin_user; i++)
4135 if (group_list[i] == exim_gid)
4136 f.admin_user = TRUE;
4137 else if (admin_groups)
4138 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4139 if (admin_groups[j] == group_list[i])
4140 f.admin_user = TRUE;
4142 /* Another group of privileged users are the trusted users. These are root,
4143 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4144 are permitted to specify sender_addresses with -f on the command line, and
4145 other message parameters as well. */
4147 if (real_uid == root_uid || real_uid == exim_uid)
4148 f.trusted_caller = TRUE;
4152 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4153 if (trusted_users[i] == real_uid)
4154 f.trusted_caller = TRUE;
4157 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4158 if (trusted_groups[i] == real_gid)
4159 f.trusted_caller = TRUE;
4160 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4161 if (trusted_groups[i] == group_list[j])
4162 f.trusted_caller = TRUE;
4165 /* At this point, we know if the user is privileged and some command-line
4166 options become possibly impermissible, depending upon the configuration file. */
4168 if (checking && commandline_checks_require_admin && !f.admin_user)
4169 exim_fail("exim: those command-line flags are set to require admin\n");
4171 /* Handle the decoding of logging options. */
4173 decode_bits(log_selector, log_selector_size, log_notall,
4174 log_selector_string, log_options, log_options_count, US"log", 0);
4178 debug_printf("configuration file is %s\n", config_main_filename);
4179 debug_printf("log selectors =");
4180 for (int i = 0; i < log_selector_size; i++)
4181 debug_printf(" %08x", log_selector[i]);
4185 /* If domain literals are not allowed, check the sender address that was
4186 supplied with -f. Ditto for a stripped trailing dot. */
4190 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4191 exim_fail("exim: bad -f address \"%s\": domain literals not "
4192 "allowed\n", sender_address);
4193 if (f_end_dot && !strip_trailing_dot)
4194 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4195 "(trailing dot not allowed)\n", sender_address);
4198 /* See if an admin user overrode our logging. */
4200 if (cmdline_syslog_name)
4203 syslog_processname = cmdline_syslog_name;
4204 log_file_path = string_copy(CUS"syslog");
4207 /* not a panic, non-privileged users should not be able to spam paniclog */
4209 "exim: you lack sufficient privilege to specify syslog process name\n");
4211 /* Paranoia check of maximum lengths of certain strings. There is a check
4212 on the length of the log file path in log.c, which will come into effect
4213 if there are any calls to write the log earlier than this. However, if we
4214 get this far but the string is very long, it is better to stop now than to
4215 carry on and (e.g.) receive a message and then have to collapse. The call to
4216 log_write() from here will cause the ultimate panic collapse if the complete
4217 file name exceeds the buffer length. */
4219 if (Ustrlen(log_file_path) > 200)
4220 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4221 "log_file_path is longer than 200 chars: aborting");
4223 if (Ustrlen(pid_file_path) > 200)
4224 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4225 "pid_file_path is longer than 200 chars: aborting");
4227 if (Ustrlen(spool_directory) > 200)
4228 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4229 "spool_directory is longer than 200 chars: aborting");
4231 /* Length check on the process name given to syslog for its TAG field,
4232 which is only permitted to be 32 characters or less. See RFC 3164. */
4234 if (Ustrlen(syslog_processname) > 32)
4235 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4236 "syslog_processname is longer than 32 chars: aborting");
4241 log_write(0, LOG_MAIN, "%s", log_oneline);
4242 return EXIT_SUCCESS;
4245 return EXIT_FAILURE;
4247 /* In some operating systems, the environment variable TMPDIR controls where
4248 temporary files are created; Exim doesn't use these (apart from when delivering
4249 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4250 If TMPDIR is found in the environment, reset it to the value defined in the
4251 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4252 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4253 EXIM_TMPDIR by the build scripts.
4257 if (environ) for (uschar ** p = USS environ; *p; p++)
4258 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4260 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4261 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4263 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4267 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4268 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4269 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4270 called by a user who has set the TZ variable. This then affects the timestamps
4271 in log files and in Received: headers, and any created Date: header lines. The
4272 required timezone is settable in the configuration file, so nothing can be done
4273 about this earlier - but hopefully nothing will normally be logged earlier than
4274 this. We have to make a new environment if TZ is wrong, but don't bother if
4275 timestamps_utc is set, because then all times are in UTC anyway. */
4277 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4278 f.timestamps_utc = TRUE;
4281 uschar *envtz = US getenv("TZ");
4283 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4284 : timezone_string != NULL
4287 uschar **p = USS environ;
4291 if (environ) while (*p++) count++;
4292 if (!envtz) count++;
4293 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4294 if (environ) for (p = USS environ; *p; p++)
4295 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4296 if (timezone_string)
4298 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4299 sprintf(CS *newp++, "TZ=%s", timezone_string);
4304 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4305 tod_stamp(tod_log));
4309 /* Handle the case when we have removed the setuid privilege because of -C or
4310 -D. This means that the caller of Exim was not root.
4312 There is a problem if we were running as the Exim user. The sysadmin may
4313 expect this case to retain privilege because "the binary was called by the
4314 Exim user", but it hasn't, because either the -D option set macros, or the
4315 -C option set a non-trusted configuration file. There are two possibilities:
4317 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4318 to do message deliveries. Thus, the fact that it is running as a
4319 non-privileged user is plausible, and might be wanted in some special
4320 configurations. However, really_exim will have been set false when
4321 privilege was dropped, to stop Exim trying to write to its normal log
4322 files. Therefore, re-enable normal log processing, assuming the sysadmin
4323 has set up the log directory correctly.
4325 (2) If deliver_drop_privilege is not set, the configuration won't work as
4326 apparently intended, and so we log a panic message. In order to retain
4327 root for -C or -D, the caller must either be root or be invoking a
4328 trusted configuration file (when deliver_drop_privilege is false). */
4330 if ( removed_privilege
4331 && (!f.trusted_config || opt_D_used)
4332 && real_uid == exim_uid)
4333 if (deliver_drop_privilege)
4334 f.really_exim = TRUE; /* let logging work normally */
4336 log_write(0, LOG_MAIN|LOG_PANIC,
4337 "exim user lost privilege for using %s option",
4338 f.trusted_config? "-D" : "-C");
4340 /* Start up Perl interpreter if Perl support is configured and there is a
4341 perl_startup option, and the configuration or the command line specifies
4342 initializing starting. Note that the global variables are actually called
4343 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4346 if (perl_start_option != 0)
4347 opt_perl_at_start = (perl_start_option > 0);
4348 if (opt_perl_at_start && opt_perl_startup != NULL)
4351 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4352 if ((errstr = init_perl(opt_perl_startup)))
4353 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4354 opt_perl_started = TRUE;
4356 #endif /* EXIM_PERL */
4358 /* Log the arguments of the call if the configuration file said so. This is
4359 a debugging feature for finding out what arguments certain MUAs actually use.
4360 Don't attempt it if logging is disabled, or if listing variables or if
4361 verifying/testing addresses or expansions. */
4363 if ( (debug_selector & D_any || LOGGING(arguments))
4364 && f.really_exim && !list_options && !checking)
4366 uschar *p = big_buffer;
4367 Ustrcpy(p, US"cwd= (failed)");
4374 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4375 p += Ustrlen(CCS p);
4378 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4380 for (int i = 0; i < argc; i++)
4382 int len = Ustrlen(argv[i]);
4383 const uschar *printing;
4385 if (p + len + 8 >= big_buffer + big_buffer_size)
4387 Ustrcpy(p, US" ...");
4388 log_write(0, LOG_MAIN, "%s", big_buffer);
4389 Ustrcpy(big_buffer, US"...");
4392 printing = string_printing(argv[i]);
4393 if (!*printing) quote = US"\"";
4396 const uschar *pp = printing;
4398 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4400 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4401 (p - big_buffer) - 4), printing, quote);
4404 if (LOGGING(arguments))
4405 log_write(0, LOG_MAIN, "%s", big_buffer);
4407 debug_printf("%s\n", big_buffer);
4410 /* Set the working directory to be the top-level spool directory. We don't rely
4411 on this in the code, which always uses fully qualified names, but it's useful
4412 for core dumps etc. Don't complain if it fails - the spool directory might not
4413 be generally accessible and calls with the -C option (and others) have lost
4414 privilege by now. Before the chdir, we try to ensure that the directory exists.
4417 if (Uchdir(spool_directory) != 0)
4419 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4420 (void) Uchdir(spool_directory);
4423 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4424 alias file. Exim doesn't have such a concept, but this call is screwed into
4425 Sun's YP makefiles. Handle this by calling a configured script, as the real
4426 user who called Exim. The -oA option can be used to pass an argument to the
4431 (void) fclose(config_file);
4432 if (bi_command && *bi_command)
4436 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4437 if (alias_arg) argv[i++] = alias_arg;
4440 setgroups(group_count, group_list);
4441 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4443 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4444 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4446 execv(CS argv[0], (char *const *)argv);
4447 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4451 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4456 /* We moved the admin/trusted check to be immediately after reading the
4457 configuration file. We leave these prints here to ensure that syslog setup,
4458 logfile setup, and so on has already happened. */
4460 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4461 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4463 /* Only an admin user may start the daemon or force a queue run in the default
4464 configuration, but the queue run restriction can be relaxed. Only an admin
4465 user may request that a message be returned to its sender forthwith. Only an
4466 admin user may specify a debug level greater than D_v (because it might show
4467 passwords, etc. in lookup queries). Only an admin user may request a queue
4468 count. Only an admin user can use the test interface to scan for email
4469 (because Exim will be in the spool dir and able to look at mails). */
4473 BOOL debugset = (debug_selector & ~D_v) != 0;
4474 if ( deliver_give_up || f.daemon_listen || malware_test_file
4475 || count_queue && queue_list_requires_admin
4476 || list_queue && queue_list_requires_admin
4477 || queue_interval >= 0 && prod_requires_admin
4478 || queue_name_dest && prod_requires_admin
4479 || debugset && !f.running_in_test_harness
4481 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4484 /* If the real user is not root or the exim uid, the argument for passing
4485 in an open TCP/IP connection for another message is not permitted, nor is
4486 running with the -N option for any delivery action, unless this call to exim is
4487 one that supplied an input message, or we are using a patched exim for
4488 regression testing. */
4490 if ( real_uid != root_uid && real_uid != exim_uid
4491 && ( continue_hostname
4493 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4495 && !f.running_in_test_harness
4497 exim_fail("exim: Permission denied\n");
4499 /* If the caller is not trusted, certain arguments are ignored when running for
4500 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4501 Note that authority for performing certain actions on messages is tested in the
4502 queue_action() function. */
4504 if (!f.trusted_caller && !checking)
4506 sender_host_name = sender_host_address = interface_address =
4507 sender_ident = received_protocol = NULL;
4508 sender_host_port = interface_port = 0;
4509 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4512 /* If a sender host address is set, extract the optional port number off the
4513 end of it and check its syntax. Do the same thing for the interface address.
4514 Exim exits if the syntax is bad. */
4518 if (sender_host_address)
4519 sender_host_port = check_port(sender_host_address);
4520 if (interface_address)
4521 interface_port = check_port(interface_address);
4524 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4527 if (f.trusted_caller)
4529 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4530 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4533 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4536 /* If an SMTP message is being received check to see if the standard input is a
4537 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4538 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4543 union sockaddr_46 inetd_sock;
4544 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4545 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4547 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4548 if (family == AF_INET || family == AF_INET6)
4550 union sockaddr_46 interface_sock;
4551 size = sizeof(interface_sock);
4553 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4554 interface_address = host_ntoa(-1, &interface_sock, NULL,
4557 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4559 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4562 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4563 NULL, &sender_host_port);
4564 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4565 "inetd is not supported when mua_wrapper is set");
4569 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4574 /* If the load average is going to be needed while receiving a message, get it
4575 now for those OS that require the first call to os_getloadavg() to be done as
4576 root. There will be further calls later for each message received. */
4578 #ifdef LOAD_AVG_NEEDS_ROOT
4579 if ( receiving_message
4580 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4581 load_average = OS_GETLOADAVG();
4584 /* The queue_only configuration option can be overridden by -odx on the command
4585 line, except that if queue_only_override is false, queue_only cannot be unset
4586 from the command line. */
4588 if (queue_only_set && (queue_only_override || arg_queue_only))
4589 queue_only = arg_queue_only;
4591 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4594 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4595 if (arg_smtp_receive_timeout >= 0)
4596 smtp_receive_timeout = arg_smtp_receive_timeout;
4598 /* If Exim was started with root privilege, unless we have already removed the
4599 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4600 except when starting the daemon or doing some kind of delivery or address
4601 testing (-bt). These are the only cases when root need to be retained. We run
4602 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4603 retained only for starting the daemon. We always do the initgroups() in this
4604 situation (controlled by the TRUE below), in order to be as close as possible
4605 to the state Exim usually runs in. */
4607 if ( !unprivileged /* originally had root AND */
4608 && !removed_privilege /* still got root AND */
4609 && !f.daemon_listen /* not starting the daemon */
4610 && queue_interval <= 0 /* (either kind of daemon) */
4611 && ( /* AND EITHER */
4612 deliver_drop_privilege /* requested unprivileged */
4614 queue_interval < 0 /* not running the queue */
4615 && ( msg_action_arg < 0 /* and */
4616 || msg_action != MSG_DELIVER /* not delivering */
4618 && (!checking || !f.address_test_mode) /* not address checking */
4619 && !rcpt_verify_quota /* and not quota checking */
4621 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4623 /* When we are retaining a privileged uid, we still change to the exim gid. */
4628 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4629 rv = setgid(exim_gid);
4630 /* Impact of failure is that some stuff might end up with an incorrect group.
4631 We track this for failures from root, since any attempt to change privilege
4632 by root should succeed and failures should be examined. For non-root,
4633 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4634 no need to complain then. */
4636 if (!(unprivileged || removed_privilege))
4637 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4640 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4641 (long int)exim_gid, strerror(errno));
4645 /* Handle a request to scan a file for malware */
4646 if (malware_test_file)
4648 #ifdef WITH_CONTENT_SCAN
4650 set_process_info("scanning file for malware");
4651 if ((result = malware_in_file(malware_test_file)) == FAIL)
4653 printf("No malware found.\n");
4658 printf("Malware lookup returned non-okay/fail: %d\n", result);
4662 printf("Malware found: %s\n", malware_name);
4664 printf("Malware scan detected malware of unknown name.\n");
4666 printf("Malware scanning not enabled at compile time.\n");
4671 /* Handle a request to list the delivery queue */
4675 set_process_info("listing the queue");
4676 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4680 /* Handle a request to count the delivery queue */
4684 set_process_info("counting the queue");
4685 fprintf(stdout, "%u\n", queue_count());
4689 /* Handle actions on specific messages, except for the force delivery and
4690 message load actions, which are done below. Some actions take a whole list of
4691 message ids, which are known to continue up to the end of the arguments. Others
4692 take a single message id and then operate on the recipients list. */
4694 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4696 int yield = EXIT_SUCCESS;
4697 set_process_info("acting on specified messages");
4699 /* ACL definitions may be needed when removing a message (-Mrm) because
4700 event_action gets expanded */
4702 if (msg_action == MSG_REMOVE)
4704 int old_pool = store_pool;
4705 store_pool = POOL_CONFIG;
4707 store_pool = old_pool;
4708 store_writeprotect(POOL_CONFIG);
4711 if (!one_msg_action)
4713 for (i = msg_action_arg; i < argc; i++)
4714 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4715 yield = EXIT_FAILURE;
4718 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4719 default: printf("\n"); break;
4723 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4724 recipients_arg)) yield = EXIT_FAILURE;
4728 /* We used to set up here to skip reading the ACL section, on
4729 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4730 Now, since the intro of the ${acl } expansion, ACL definitions may be
4731 needed in transports so we lost the optimisation. */
4734 int old_pool = store_pool;
4735 #ifdef MEASURE_TIMING
4736 struct timeval t0, diff;
4737 (void)gettimeofday(&t0, NULL);
4740 store_pool = POOL_CONFIG;
4742 store_pool = old_pool;
4744 /* -be can add macro definitions, needing to link to the macro structure
4745 chain. Otherwise, make the memory used for config data readonly. */
4747 if (!expansion_test)
4748 store_writeprotect(POOL_CONFIG);
4750 #ifdef MEASURE_TIMING
4751 report_time_since(&t0, US"readconf_rest (delta)");
4755 /* Handle a request to check quota */
4756 if (rcpt_verify_quota)
4757 if (real_uid != root_uid && real_uid != exim_uid)
4758 exim_fail("exim: Permission denied\n");
4759 else if (recipients_arg >= argc)
4760 exim_fail("exim: missing recipient for quota check\n");
4763 verify_quota(argv[recipients_arg]);
4764 exim_exit(EXIT_SUCCESS);
4767 /* Handle the -brt option. This is for checking out retry configurations.
4768 The next three arguments are a domain name or a complete address, and
4769 optionally two error numbers. All it does is to call the function that
4770 scans the retry configuration data. */
4772 if (test_retry_arg >= 0)
4774 retry_config *yield;
4775 int basic_errno = 0;
4777 const uschar *s1, *s2;
4779 if (test_retry_arg >= argc)
4781 printf("-brt needs a domain or address argument\n");
4782 exim_exit(EXIT_FAILURE);
4784 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4787 /* If the first argument contains no @ and no . it might be a local user
4788 or it might be a single-component name. Treat as a domain. */
4790 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4792 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4793 "being \ntreated as a one-component domain, not as a local part.\n\n",
4797 /* There may be an optional second domain arg. */
4799 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4800 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4802 /* The final arg is an error name */
4804 if (test_retry_arg < argc)
4806 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4808 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4811 printf("%s\n", CS error);
4812 return EXIT_FAILURE;
4815 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4816 code > 100 as an error is for matching codes to the decade. Turn them into
4817 a real error code, off the decade. */
4819 if (basic_errno == ERRNO_MAIL4XX ||
4820 basic_errno == ERRNO_RCPT4XX ||
4821 basic_errno == ERRNO_DATA4XX)
4823 int code = (more_errno >> 8) & 255;
4825 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4826 else if (code > 100)
4827 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4831 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4832 printf("No retry information found\n");
4835 more_errno = yield->more_errno;
4836 printf("Retry rule: %s ", yield->pattern);
4838 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4840 printf("quota%s%s ",
4841 (more_errno > 0)? "_" : "",
4842 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4844 else if (yield->basic_errno == ECONNREFUSED)
4846 printf("refused%s%s ",
4847 (more_errno > 0)? "_" : "",
4848 (more_errno == 'M')? "MX" :
4849 (more_errno == 'A')? "A" : "");
4851 else if (yield->basic_errno == ETIMEDOUT)
4854 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4856 if (more_errno != 0) printf("_%s",
4857 (more_errno == 'M')? "MX" : "A");
4860 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4861 printf("auth_failed ");
4864 for (retry_rule * r = yield->rules; r; r = r->next)
4866 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4867 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4873 printf(",%d.", x/1000);
4887 exim_exit(EXIT_SUCCESS);
4890 /* Handle a request to list one or more configuration options */
4891 /* If -n was set, we suppress some information */
4896 set_process_info("listing variables");
4897 if (recipients_arg >= argc)
4898 fail = !readconf_print(US"all", NULL, flag_n);
4899 else for (i = recipients_arg; i < argc; i++)
4902 (Ustrcmp(argv[i], "router") == 0 ||
4903 Ustrcmp(argv[i], "transport") == 0 ||
4904 Ustrcmp(argv[i], "authenticator") == 0 ||
4905 Ustrcmp(argv[i], "macro") == 0 ||
4906 Ustrcmp(argv[i], "environment") == 0))
4908 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4912 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4914 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4919 set_process_info("listing config");
4920 exim_exit(readconf_print(US"config", NULL, flag_n)
4921 ? EXIT_SUCCESS : EXIT_FAILURE);
4925 /* Initialise subsystems as required. */
4929 /* Handle a request to deliver one or more messages that are already on the
4930 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4931 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4933 Delivery of specific messages is typically used for a small number when
4934 prodding by hand (when the option forced_delivery will be set) or when
4935 re-execing to regain root privilege. Each message delivery must happen in a
4936 separate process, so we fork a process for each one, and run them sequentially
4937 so that debugging output doesn't get intertwined, and to avoid spawning too
4938 many processes if a long list is given. However, don't fork for the last one;
4939 this saves a process in the common case when Exim is called to deliver just one
4942 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4944 if (prod_requires_admin && !f.admin_user)
4946 fprintf(stderr, "exim: Permission denied\n");
4947 exim_exit(EXIT_FAILURE);
4949 set_process_info("delivering specified messages");
4950 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4951 for (i = msg_action_arg; i < argc; i++)
4955 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4956 that runs into a later copy into the untainted global message_id[] */
4957 /*XXX Do we need a length limit check here? */
4959 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4960 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4962 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4963 exim_underbar_exit(EXIT_SUCCESS);
4967 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4969 exim_exit(EXIT_FAILURE);
4973 exim_exit(EXIT_SUCCESS);
4977 /* If only a single queue run is requested, without SMTP listening, we can just
4978 turn into a queue runner, with an optional starting message id. */
4980 if (queue_interval == 0 && !f.daemon_listen)
4982 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4983 start_queue_run_id ? US" starting at " : US"",
4984 start_queue_run_id ? start_queue_run_id: US"",
4985 stop_queue_run_id ? US" stopping at " : US"",
4986 stop_queue_run_id ? stop_queue_run_id : US"");
4988 set_process_info("running the '%s' queue (single queue run)", queue_name);
4990 set_process_info("running the queue (single queue run)");
4991 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4992 exim_exit(EXIT_SUCCESS);
4996 /* Find the login name of the real user running this process. This is always
4997 needed when receiving a message, because it is written into the spool file. It
4998 may also be used to construct a from: or a sender: header, and in this case we
4999 need the user's full name as well, so save a copy of it, checked for RFC822
5000 syntax and munged if necessary, if it hasn't previously been set by the -F
5001 argument. We may try to get the passwd entry more than once, in case NIS or
5002 other delays are in evidence. Save the home directory for use in filter testing
5007 if ((pw = getpwuid(real_uid)) != NULL)
5009 originator_login = string_copy(US pw->pw_name);
5010 originator_home = string_copy(US pw->pw_dir);
5012 /* If user name has not been set by -F, set it from the passwd entry
5013 unless -f has been used to set the sender address by a trusted user. */
5015 if (!originator_name)
5017 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5019 uschar *name = US pw->pw_gecos;
5020 uschar *amp = Ustrchr(name, '&');
5023 /* Most Unix specify that a '&' character in the gecos field is
5024 replaced by a copy of the login name, and some even specify that
5025 the first character should be upper cased, so that's what we do. */
5030 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5031 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5032 buffer[loffset] = toupper(buffer[loffset]);
5036 /* If a pattern for matching the gecos field was supplied, apply
5037 it and then expand the name string. */
5039 if (gecos_pattern && gecos_name)
5041 const pcre2_code *re;
5042 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
5044 if (regex_match_and_setup(re, name, 0, -1))
5046 uschar *new_name = expand_string(gecos_name);
5050 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5051 "gecos field \"%s\"\n", new_name, name);
5054 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5055 "\"%s\": %s\n", gecos_name, expand_string_message);
5057 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5058 "gecos field \"%s\"\n", gecos_pattern, name);
5059 store_free((void *)re);
5061 originator_name = string_copy(name);
5064 /* A trusted caller has used -f but not -F */
5066 else originator_name = US"";
5069 /* Break the retry loop */
5074 if (++i > finduser_retries) break;
5078 /* If we cannot get a user login, log the incident and give up, unless the
5079 configuration specifies something to use. When running in the test harness,
5080 any setting of unknown_login overrides the actual name. */
5082 if (!originator_login || f.running_in_test_harness)
5086 originator_login = expand_string(unknown_login);
5087 if (!originator_name && unknown_username)
5088 originator_name = expand_string(unknown_username);
5089 if (!originator_name) originator_name = US"";
5091 if (!originator_login)
5092 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5096 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5099 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5101 /* If a message is created by this call of Exim, the uid/gid of its originator
5102 are those of the caller. These values are overridden if an existing message is
5103 read in from the spool. */
5105 originator_uid = real_uid;
5106 originator_gid = real_gid;
5108 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5109 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5111 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5112 returns. We leave this till here so that the originator_ fields are available
5113 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5116 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5120 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5121 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5122 "mua_wrapper is set");
5125 # ifndef DISABLE_TLS
5126 /* This also checks that the library linkage is working and we can call
5127 routines in it, so call even if tls_require_ciphers is unset */
5129 # ifdef MEASURE_TIMING
5130 struct timeval t0, diff;
5131 (void)gettimeofday(&t0, NULL);
5133 if (!tls_dropprivs_validate_require_cipher(FALSE))
5135 # ifdef MEASURE_TIMING
5136 report_time_since(&t0, US"validate_ciphers (delta)");
5144 /* If the sender ident has not been set (by a trusted caller) set it to
5145 the caller. This will get overwritten below for an inetd call. If a trusted
5146 caller has set it empty, unset it. */
5148 if (!sender_ident) sender_ident = originator_login;
5149 else if (!*sender_ident) sender_ident = NULL;
5151 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5152 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5153 originator_* variables set. */
5155 if (test_rewrite_arg >= 0)
5157 f.really_exim = FALSE;
5158 if (test_rewrite_arg >= argc)
5160 printf("-brw needs an address argument\n");
5161 exim_exit(EXIT_FAILURE);
5163 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5164 exim_exit(EXIT_SUCCESS);
5167 /* A locally-supplied message is considered to be coming from a local user
5168 unless a trusted caller supplies a sender address with -f, or is passing in the
5169 message via SMTP (inetd invocation or otherwise). */
5171 if ( !sender_address && !smtp_input
5172 || !f.trusted_caller && filter_test == FTEST_NONE)
5174 f.sender_local = TRUE;
5176 /* A trusted caller can supply authenticated_sender and authenticated_id
5177 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5178 defaults except when host checking. */
5180 if (!authenticated_sender && !host_checking)
5181 authenticated_sender = string_sprintf("%s@%s", originator_login,
5182 qualify_domain_sender);
5183 if (!authenticated_id && !host_checking)
5184 authenticated_id = originator_login;
5187 /* Trusted callers are always permitted to specify the sender address.
5188 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5189 is specified is the empty address. However, if a trusted caller does not
5190 specify a sender address for SMTP input, we leave sender_address unset. This
5191 causes the MAIL commands to be honoured. */
5193 if ( !smtp_input && !sender_address
5194 || !receive_check_set_sender(sender_address))
5196 /* Either the caller is not permitted to set a general sender, or this is
5197 non-SMTP input and the trusted caller has not set a sender. If there is no
5198 sender, or if a sender other than <> is set, override with the originator's
5199 login (which will get qualified below), except when checking things. */
5201 if ( !sender_address /* No sender_address set */
5203 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5204 !checking)) /* Not running tests, including filter tests */
5206 sender_address = originator_login;
5207 f.sender_address_forced = FALSE;
5208 sender_address_domain = 0;
5212 /* Remember whether an untrusted caller set the sender address */
5214 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5216 /* Ensure that the sender address is fully qualified unless it is the empty
5217 address, which indicates an error message, or doesn't exist (root caller, smtp
5218 interface, no -f argument). */
5220 if (sender_address && *sender_address && sender_address_domain == 0)
5221 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5222 qualify_domain_sender);
5224 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5226 /* Handle a request to verify a list of addresses, or test them for delivery.
5227 This must follow the setting of the sender address, since routers can be
5228 predicated upon the sender. If no arguments are given, read addresses from
5229 stdin. Set debug_level to at least D_v to get full output for address testing.
5232 if (verify_address_mode || f.address_test_mode)
5235 int flags = vopt_qualify;
5237 if (verify_address_mode)
5239 if (!verify_as_sender) flags |= vopt_is_recipient;
5240 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5245 flags |= vopt_is_recipient;
5246 debug_selector |= D_v;
5247 debug_file = stderr;
5248 debug_fd = fileno(debug_file);
5249 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5252 if (recipients_arg < argc)
5253 while (recipients_arg < argc)
5255 /* Supplied addresses are tainted since they come from a user */
5256 uschar * s = string_copy_taint(
5257 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5261 BOOL finished = FALSE;
5262 uschar *ss = parse_find_address_end(s, FALSE);
5263 if (*ss == ',') *ss = 0; else finished = TRUE;
5264 test_address(s, flags, &exit_value);
5267 while (*++s == ',' || isspace(*s)) ;
5273 uschar * s = get_stdinput(NULL, NULL);
5275 test_address(string_copy_taint(
5276 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5278 flags, &exit_value);
5282 exim_exit(exit_value);
5285 /* Handle expansion checking. Either expand items on the command line, or read
5286 from stdin if there aren't any. If -Mset was specified, load the message so
5287 that its variables can be used, but restrict this facility to admin users.
5288 Otherwise, if -bem was used, read a message from stdin. */
5292 dns_init(FALSE, FALSE, FALSE);
5293 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5297 exim_fail("exim: permission denied\n");
5298 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5299 /* Checking the length of the ID is sufficient to validate it.
5300 Get an untainted version so file opens can be done. */
5301 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5303 spoolname = string_sprintf("%s-H", message_id);
5304 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5305 printf ("Failed to load message datafile %s\n", message_id);
5306 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5307 printf ("Failed to load message %s\n", message_id);
5310 /* Read a test message from a file. We fudge it up to be on stdin, saving
5311 stdin itself for later reading of expansion strings. */
5313 else if (expansion_test_message)
5315 int save_stdin = dup(0);
5316 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5318 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5321 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5322 message_ended = END_NOTENDED;
5323 read_message_body(receive_msg(extract_recipients));
5324 message_linecount += body_linecount;
5325 (void)dup2(save_stdin, 0);
5326 (void)close(save_stdin);
5327 clearerr(stdin); /* Required by Darwin */
5330 /* Only admin users may see config-file macros this way */
5332 if (!f.admin_user) macros_user = macros = mlast = NULL;
5334 /* Allow $recipients for this testing */
5336 f.enable_dollar_recipients = TRUE;
5338 /* Expand command line items */
5340 if (recipients_arg < argc)
5341 while (recipients_arg < argc)
5342 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5348 char *(*fn_readline)(const char *) = NULL;
5349 void (*fn_addhist)(const char *) = NULL;
5353 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5356 while (s = get_stdinput(fn_readline, fn_addhist))
5357 expansion_test_line(s);
5360 if (dlhandle) dlclose(dlhandle);
5364 /* The data file will be open after -Mset */
5366 if (deliver_datafile >= 0)
5368 (void)close(deliver_datafile);
5369 deliver_datafile = -1;
5372 exim_exit(EXIT_SUCCESS);
5376 /* The active host name is normally the primary host name, but it can be varied
5377 for hosts that want to play several parts at once. We need to ensure that it is
5378 set for host checking, and for receiving messages. */
5380 smtp_active_hostname = primary_hostname;
5381 if (raw_active_hostname != NULL)
5383 uschar *nah = expand_string(raw_active_hostname);
5386 if (!f.expand_string_forcedfail)
5387 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5388 "(smtp_active_hostname): %s", raw_active_hostname,
5389 expand_string_message);
5391 else if (nah[0] != 0) smtp_active_hostname = nah;
5394 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5395 given IP address so that the blocking and relay configuration can be tested.
5396 Unless a sender_ident was set by -oMt, we discard it (the default is the
5397 caller's login name). An RFC 1413 call is made only if we are running in the
5398 test harness and an incoming interface and both ports are specified, because
5399 there is no TCP/IP call to find the ident for. */
5406 if (!sender_ident_set)
5408 sender_ident = NULL;
5409 if (f.running_in_test_harness && sender_host_port
5410 && interface_address && interface_port)
5411 verify_get_ident(1223); /* note hardwired port number */
5414 /* In case the given address is a non-canonical IPv6 address, canonicalize
5415 it. The code works for both IPv4 and IPv6, as it happens. */
5417 size = host_aton(sender_host_address, x);
5418 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5419 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5421 /* Now set up for testing */
5423 host_build_sender_fullhost();
5427 f.sender_local = FALSE;
5428 f.sender_host_notsocket = TRUE;
5429 debug_file = stderr;
5430 debug_fd = fileno(debug_file);
5431 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5432 "**** but without any ident (RFC 1413) callback.\n"
5433 "**** This is not for real!\n\n",
5434 sender_host_address);
5436 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5437 if (verify_check_host(&hosts_connection_nolog) == OK)
5439 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5440 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5442 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5444 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5445 because a log line has already been written for all its failure exists
5446 (usually "connection refused: <reason>") and writing another one is
5447 unnecessary clutter. */
5449 if (smtp_start_session())
5452 for (; (reset_point = store_mark()); store_reset(reset_point))
5454 if (smtp_setup_msg() <= 0) break;
5455 if (!receive_msg(FALSE)) break;
5457 return_path = sender_address = NULL;
5458 dnslist_domain = dnslist_matched = NULL;
5459 #ifndef DISABLE_DKIM
5460 dkim_cur_signer = NULL;
5463 deliver_localpart_orig = NULL;
5464 deliver_domain_orig = NULL;
5465 callout_address = sending_ip_address = NULL;
5466 deliver_localpart_data = deliver_domain_data =
5467 recipient_data = sender_data = NULL;
5468 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5472 exim_exit(EXIT_SUCCESS);
5476 /* Arrange for message reception if recipients or SMTP were specified;
5477 otherwise complain unless a version print (-bV) happened or this is a filter
5478 verification test or info dump.
5479 In the former case, show the configuration file name. */
5481 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5483 if (version_printed)
5485 if (Ustrchr(config_main_filelist, ':'))
5486 printf("Configuration file search path is %s\n", config_main_filelist);
5487 printf("Configuration file is %s\n", config_main_filename);
5488 return EXIT_SUCCESS;
5491 if (info_flag != CMDINFO_NONE)
5493 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5494 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5497 if (filter_test == FTEST_NONE)
5498 exim_usage(called_as);
5502 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5503 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5504 that we are not called from inetd, because that is rejected above. The
5505 following configuration settings are forced here:
5507 (1) Synchronous delivery (-odi)
5508 (2) Errors to stderr (-oep == -oeq)
5509 (3) No parallel remote delivery
5510 (4) Unprivileged delivery
5512 We don't force overall queueing options because there are several of them;
5513 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5514 to override any SMTP queueing. */
5518 f.synchronous_delivery = TRUE;
5519 arg_error_handling = ERRORS_STDERR;
5520 remote_max_parallel = 1;
5521 deliver_drop_privilege = TRUE;
5522 f.queue_smtp = FALSE;
5523 queue_smtp_domains = NULL;
5525 message_utf8_downconvert = -1; /* convert-if-needed */
5530 /* Prepare to accept one or more new messages on the standard input. When a
5531 message has been read, its id is returned in message_id[]. If doing immediate
5532 delivery, we fork a delivery process for each received message, except for the
5533 last one, where we can save a process switch.
5535 It is only in non-smtp mode that error_handling is allowed to be changed from
5536 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5537 sendmail error modes other than -oem ever actually used? Later: yes.) */
5539 if (!smtp_input) error_handling = arg_error_handling;
5541 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5542 logging being sent down the socket and make an identd call to get the
5545 else if (f.is_inetd)
5547 (void)fclose(stderr);
5548 exim_nullstd(); /* Re-open to /dev/null */
5549 verify_get_ident(IDENT_PORT);
5550 host_build_sender_fullhost();
5551 set_process_info("handling incoming connection from %s via inetd",
5555 /* If the sender host address has been set, build sender_fullhost if it hasn't
5556 already been done (which it will have been for inetd). This caters for the
5557 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5558 so that the test for IP options is skipped for -bs input. */
5560 if (sender_host_address && !sender_fullhost)
5562 host_build_sender_fullhost();
5563 set_process_info("handling incoming connection from %s via -oMa",
5565 f.sender_host_notsocket = TRUE;
5568 /* Otherwise, set the sender host as unknown except for inetd calls. This
5569 prevents host checking in the case of -bs not from inetd and also for -bS. */
5571 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5573 /* If stdout does not exist, then dup stdin to stdout. This can happen
5574 if exim is started from inetd. In this case fd 0 will be set to the socket,
5575 but fd 1 will not be set. This also happens for passed SMTP channels. */
5577 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5579 /* Set up the incoming protocol name and the state of the program. Root is
5580 allowed to force received protocol via the -oMr option above. If we have come
5581 via inetd, the process info has already been set up. We don't set
5582 received_protocol here for smtp input, as it varies according to
5583 batch/HELO/EHLO/AUTH/TLS. */
5587 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5588 smtp_batched_input? "batched " : "",
5589 sender_address ? sender_address : originator_login);
5593 int old_pool = store_pool;
5594 store_pool = POOL_PERM;
5595 if (!received_protocol)
5596 received_protocol = string_sprintf("local%s", called_as);
5597 store_pool = old_pool;
5598 set_process_info("accepting a local non-SMTP message from <%s>",
5602 /* Initialize the session_local_queue-only flag (this will be ignored if
5603 mua_wrapper is set) */
5606 session_local_queue_only = queue_only;
5608 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5609 the spool if so configured. On failure, we must not attempt to send an error
5610 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5611 error code is given.) */
5613 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5614 exim_fail("exim: insufficient disk space\n");
5616 /* If this is smtp input of any kind, real or batched, handle the start of the
5619 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5620 because a log line has already been written for all its failure exists
5621 (usually "connection refused: <reason>") and writing another one is
5622 unnecessary clutter. */
5628 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5629 if (verify_check_host(&hosts_connection_nolog) == OK)
5631 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5632 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5634 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5635 if (!smtp_start_session())
5638 exim_exit(EXIT_SUCCESS);
5642 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5643 (we handle buferring so as to have visibility of fill level). */
5647 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5648 if (expand_string_message)
5649 if (thismessage_size_limit == -1)
5650 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5651 "message_size_limit: %s", expand_string_message);
5653 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5654 "message_size_limit: %s", expand_string_message);
5656 setvbuf(stdin, NULL, _IONBF, 0);
5659 /* Loop for several messages when reading SMTP input. If we fork any child
5660 processes, we don't want to wait for them unless synchronous delivery is
5661 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5662 same as SIG_DFL, despite the fact that documentation often lists the default as
5663 "ignore". This is a confusing area. This is what I know:
5665 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5666 processes that complete simply to go away without ever becoming defunct. You
5667 can't then wait for them - but we don't want to wait for them in the
5668 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5669 happen for all OS (e.g. *BSD is different).
5671 But that's not the end of the story. Some (many? all?) systems have the
5672 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5673 has by default, so it seems that the difference is merely one of default
5674 (compare restarting vs non-restarting signals).
5676 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5677 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5678 of the loop below. Paranoia rules.
5680 February 2003: That's *still* not the end of the story. There are now versions
5681 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5682 process then calls waitpid(), a grumble is written to the system log, because
5683 this is logically inconsistent. In other words, it doesn't like the paranoia.
5684 As a consequence of this, the waitpid() below is now excluded if we are sure
5685 that SIG_IGN works. */
5687 if (!f.synchronous_delivery)
5690 struct sigaction act;
5691 act.sa_handler = SIG_IGN;
5692 sigemptyset(&(act.sa_mask));
5693 act.sa_flags = SA_NOCLDWAIT;
5694 sigaction(SIGCHLD, &act, NULL);
5696 signal(SIGCHLD, SIG_IGN);
5700 /* Save the current store pool point, for resetting at the start of
5701 each message, and save the real sender address, if any. */
5703 real_sender_address = sender_address;
5705 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5706 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5709 for (BOOL more = TRUE; more; )
5711 rmark reset_point = store_mark();
5714 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5715 input and build the recipients list, before calling receive_msg() to read the
5716 message proper. Whatever sender address is given in the SMTP transaction is
5717 often ignored for local senders - we use the actual sender, which is normally
5718 either the underlying user running this process or a -f argument provided by
5719 a trusted caller. It is saved in real_sender_address. The test for whether to
5720 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5725 if ((rc = smtp_setup_msg()) > 0)
5727 if (real_sender_address != NULL &&
5728 !receive_check_set_sender(sender_address))
5730 sender_address = raw_sender = real_sender_address;
5731 sender_address_unrewritten = NULL;
5734 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5735 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5736 the very end. The result of the ACL is ignored (as for other non-SMTP
5737 messages). It is run for its potential side effects. */
5739 if (smtp_batched_input && acl_not_smtp_start != NULL)
5741 uschar *user_msg, *log_msg;
5742 f.enable_dollar_recipients = TRUE;
5743 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5744 &user_msg, &log_msg);
5745 f.enable_dollar_recipients = FALSE;
5748 /* Now get the data for the message */
5750 more = receive_msg(extract_recipients);
5753 cancel_cutthrough_connection(TRUE, US"receive dropped");
5754 if (more) goto MORELOOP;
5755 smtp_log_no_mail(); /* Log no mail if configured */
5756 exim_exit(EXIT_FAILURE);
5761 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5762 smtp_log_no_mail(); /* Log no mail if configured */
5763 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5767 /* In the non-SMTP case, we have all the information from the command
5768 line, but must process it in case it is in the more general RFC822
5769 format, and in any case, to detect syntax errors. Also, it appears that
5770 the use of comma-separated lists as single arguments is common, so we
5771 had better support them. */
5776 int count = argc - recipients_arg;
5777 uschar **list = argv + recipients_arg;
5779 /* These options cannot be changed dynamically for non-SMTP messages */
5781 f.active_local_sender_retain = local_sender_retain;
5782 f.active_local_from_check = local_from_check;
5784 /* Save before any rewriting */
5786 raw_sender = string_copy(sender_address);
5788 /* Loop for each argument (supplied by user hence tainted) */
5790 for (int i = 0; i < count; i++)
5792 int start, end, domain;
5794 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5795 * We'll still want to cap it to something, just in case. */
5796 uschar * s = string_copy_taint(
5797 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5800 /* Loop for each comma-separated address */
5804 BOOL finished = FALSE;
5806 uschar *ss = parse_find_address_end(s, FALSE);
5808 if (*ss == ',') *ss = 0; else finished = TRUE;
5810 /* Check max recipients - if -t was used, these aren't recipients */
5812 if (recipients_max > 0 && ++rcount > recipients_max &&
5813 !extract_recipients)
5814 if (error_handling == ERRORS_STDERR)
5816 fprintf(stderr, "exim: too many recipients\n");
5817 exim_exit(EXIT_FAILURE);
5821 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5822 errors_sender_rc : EXIT_FAILURE;
5826 BOOL b = allow_utf8_domains;
5827 allow_utf8_domains = TRUE;
5830 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5834 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5835 else allow_utf8_domains = b;
5840 if (domain == 0 && !f.allow_unqualified_recipient)
5843 errmess = US"unqualified recipient address not allowed";
5847 if (error_handling == ERRORS_STDERR)
5849 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5850 string_printing(list[i]), errmess);
5851 exim_exit(EXIT_FAILURE);
5857 eblock.text1 = string_printing(list[i]);
5858 eblock.text2 = errmess;
5860 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5861 errors_sender_rc : EXIT_FAILURE;
5864 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5867 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5871 /* Show the recipients when debugging */
5875 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5876 if (recipients_list)
5878 debug_printf("Recipients:\n");
5879 for (int i = 0; i < recipients_count; i++)
5880 debug_printf(" %s\n", recipients_list[i].address);
5884 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5885 ignored; rejecting here would just add complication, and it can just as
5886 well be done later. Allow $recipients to be visible in the ACL. */
5888 if (acl_not_smtp_start)
5890 uschar *user_msg, *log_msg;
5891 f.enable_dollar_recipients = TRUE;
5892 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5893 &user_msg, &log_msg);
5894 f.enable_dollar_recipients = FALSE;
5897 /* Pause for a while waiting for input. If none received in that time,
5898 close the logfile, if we had one open; then if we wait for a long-running
5899 datasource (months, in one use-case) log rotation will not leave us holding
5902 if (!receive_timeout)
5903 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5906 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5907 will just read the headers for the message, and not write anything onto the
5910 message_ended = END_NOTENDED;
5911 more = receive_msg(extract_recipients);
5913 /* more is always FALSE here (not SMTP message) when reading a message
5914 for real; when reading the headers of a message for filter testing,
5915 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5917 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5918 } /* Non-SMTP message reception */
5920 /* If this is a filter testing run, there are headers in store, but
5921 no message on the spool. Run the filtering code in testing mode, setting
5922 the domain to the qualify domain and the local part to the current user,
5923 unless they have been set by options. The prefix and suffix are left unset
5924 unless specified. The the return path is set to to the sender unless it has
5925 already been set from a return-path header in the message. */
5927 if (filter_test != FTEST_NONE)
5929 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5930 deliver_domain_orig = deliver_domain;
5931 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5932 deliver_localpart_orig = deliver_localpart;
5933 deliver_localpart_prefix = US ftest_prefix;
5934 deliver_localpart_suffix = US ftest_suffix;
5935 deliver_home = originator_home;
5939 printf("Return-path copied from sender\n");
5940 return_path = string_copy(sender_address);
5943 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5944 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5946 receive_add_recipient(
5947 string_sprintf("%s%s%s@%s",
5948 ftest_prefix ? ftest_prefix : US"",
5950 ftest_suffix ? ftest_suffix : US"",
5951 deliver_domain), -1);
5953 printf("Recipient = %s\n", recipients_list[0].address);
5954 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5955 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5957 if (chdir("/")) /* Get away from wherever the user is running this from */
5959 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5960 exim_exit(EXIT_FAILURE);
5963 /* Now we run either a system filter test, or a user filter test, or both.
5964 In the latter case, headers added by the system filter will persist and be
5965 available to the user filter. We need to copy the filter variables
5968 if (filter_test & FTEST_SYSTEM)
5969 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5970 exim_exit(EXIT_FAILURE);
5972 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5974 if (filter_test & FTEST_USER)
5975 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5976 exim_exit(EXIT_FAILURE);
5978 exim_exit(EXIT_SUCCESS);
5981 /* Else act on the result of message reception. We should not get here unless
5982 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5983 will be TRUE. If it is not, check on the number of messages received in this
5986 if ( !session_local_queue_only
5987 && smtp_accept_queue_per_connection > 0
5988 && receive_messagecount > smtp_accept_queue_per_connection)
5990 session_local_queue_only = TRUE;
5991 queue_only_reason = 2;
5994 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5995 and queue_only_load is set, check that the load average is below it. If it is
5996 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5997 default), we put the whole session into queue_only mode. It then remains this
5998 way for any subsequent messages on the same SMTP connection. This is a
5999 deliberate choice; even though the load average may fall, it doesn't seem
6000 right to deliver later messages on the same call when not delivering earlier
6001 ones. However, there are odd cases where this is not wanted, so this can be
6002 changed by setting queue_only_load_latch false. */
6004 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6005 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6007 queue_only_reason = 3;
6008 if (queue_only_load_latch) session_local_queue_only = TRUE;
6011 /* If running as an MUA wrapper, all queueing options and freezing options
6015 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6017 /* Log the queueing here, when it will get a message id attached, but
6018 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6021 if (local_queue_only)
6023 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6024 switch(queue_only_reason)
6027 log_write(L_delay_delivery,
6028 LOG_MAIN, "no immediate delivery: more than %d messages "
6029 "received in one connection", smtp_accept_queue_per_connection);
6033 log_write(L_delay_delivery,
6034 LOG_MAIN, "no immediate delivery: load average %.2f",
6035 (double)load_average/1000.0);
6040 else if (f.queue_only_policy || f.deliver_freeze)
6041 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6043 /* Else do the delivery unless the ACL or local_scan() called for queue only
6044 or froze the message. Always deliver in a separate process. A fork failure is
6045 not a disaster, as the delivery will eventually happen on a subsequent queue
6046 run. The search cache must be tidied before the fork, as the parent will
6047 do it before exiting. The child will trigger a lookup failure and
6048 thereby defer the delivery if it tries to use (for example) a cached ldap
6049 connection that the parent has called unbind on. */
6056 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6059 close_unwanted(); /* Close unwanted file descriptors and TLS */
6060 exim_nullstd(); /* Ensure std{in,out,err} exist */
6062 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6063 mode, deliver_drop_privilege is forced TRUE). */
6065 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6067 delivery_re_exec(CEE_EXEC_EXIT);
6068 /* Control does not return here. */
6071 /* No need to re-exec */
6073 rc = deliver_message(message_id, FALSE, FALSE);
6075 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6076 ? EXIT_SUCCESS : EXIT_FAILURE);
6081 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6082 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6083 "process: %s", strerror(errno));
6087 release_cutthrough_connection(US"msg passed for delivery");
6089 /* In the parent, wait if synchronous delivery is required. This will
6090 always be the case in MUA wrapper mode. */
6092 if (f.synchronous_delivery)
6095 while (wait(&status) != pid);
6096 if ((status & 0x00ff) != 0)
6097 log_write(0, LOG_MAIN|LOG_PANIC,
6098 "process %d crashed with signal %d while delivering %s",
6099 (int)pid, status & 0x00ff, message_id);
6100 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6105 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6106 automatically reaps children (see comments above the loop), clear away any
6107 finished subprocesses here, in case there are lots of messages coming in
6108 from the same source. */
6110 #ifndef SIG_IGN_WORKS
6111 while (waitpid(-1, NULL, WNOHANG) > 0);
6115 return_path = sender_address = NULL;
6116 authenticated_sender = NULL;
6117 deliver_localpart_orig = NULL;
6118 deliver_domain_orig = NULL;
6119 deliver_host = deliver_host_address = NULL;
6120 dnslist_domain = dnslist_matched = NULL;
6121 #ifdef WITH_CONTENT_SCAN
6122 malware_name = NULL;
6124 callout_address = NULL;
6125 sending_ip_address = NULL;
6126 deliver_localpart_data = deliver_domain_data =
6127 recipient_data = sender_data = NULL;
6129 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6131 store_reset(reset_point);
6134 exim_exit(EXIT_SUCCESS); /* Never returns */
6135 return 0; /* To stop compiler warning */