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>
23 #include <execinfo.h> /*XXX maybe glibc-only? */
26 # include <gnutls/gnutls.h>
27 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
32 extern void init_lookup_list(void);
36 /*************************************************
37 * Function interface to store functions *
38 *************************************************/
40 /* We need some real functions to pass to the PCRE regular expression library
41 for store allocation via Exim's store manager. The normal calls are actually
42 macros that pass over location information to make tracing easier. These
43 functions just interface to the standard macro calls. A good compiler will
44 optimize out the tail recursion and so not make them too expensive. */
47 function_store_malloc(PCRE2_SIZE size, void * tag)
49 return store_malloc((int)size);
53 function_store_free(void * block, void * tag)
55 /* At least some version of pcre2 pass a null pointer */
56 if (block) store_free(block);
62 /*************************************************
63 * Enums for cmdline interface *
64 *************************************************/
66 enum commandline_info { CMDINFO_NONE=0,
67 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
72 /*************************************************
73 * Compile regular expression and panic on fail *
74 *************************************************/
76 /* This function is called when failure to compile a regular expression leads
77 to a panic exit. In other cases, pcre_compile() is called directly. In many
78 cases where this function is used, the results of the compilation are to be
79 placed in long-lived store, so we temporarily reset the store management
80 functions that PCRE uses if the use_malloc flag is set.
83 pattern the pattern to compile
84 caseless TRUE if caseless matching is required
85 use_malloc TRUE if compile into malloc store
87 Returns: pointer to the compiled pattern
91 regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc)
94 int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT;
95 const pcre2_code * yield;
97 pcre2_general_context * gctx;
98 pcre2_compile_context * cctx;
102 gctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
103 cctx = pcre2_compile_context_create(gctx);
108 if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options,
109 &err, &offset, cctx)))
112 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
113 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
114 "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern);
119 pcre2_compile_context_free(cctx);
120 pcre2_general_context_free(gctx);
129 pcre_gen_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
130 pcre_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
131 pcre_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
137 /*************************************************
138 * Execute regular expression and set strings *
139 *************************************************/
141 /* This function runs a regular expression match, and sets up the pointers to
142 the matched substrings. The matched strings are copied so the lifetime of
143 the subject is not a problem.
146 re the compiled expression
147 subject the subject string
148 options additional PCRE options
149 setup if < 0 do full setup
150 if >= 0 setup from setup+1 onwards,
151 excluding the full matched string
153 Returns: TRUE if matched, or FALSE
157 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
159 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
160 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
161 PCRE_EOPT | options, md, pcre_mtc_ctx);
164 if ((yield = (res >= 0)))
166 res = pcre2_get_ovector_count(md);
167 expand_nmax = setup < 0 ? 0 : setup + 1;
168 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
171 pcre2_substring_get_bynumber(md, matchnum,
172 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
173 expand_nlength[expand_nmax++] = (int)len;
177 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
180 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
181 debug_printf_indent("pcre2: %s\n", errbuf);
183 pcre2_match_data_free(md);
188 /* Check just for match with regex. Uses the common memory-handling.
192 subject string to be checked
193 slen length of subject; -1 for nul-terminated
194 rptr pointer for matched string, copied, or NULL
196 Return: TRUE for a match.
200 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
202 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
203 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
204 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
205 0, PCRE_EOPT, md, pcre_mtc_ctx);
206 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
210 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
216 /*************************************************
217 * Set up processing details *
218 *************************************************/
220 /* Save a text string for dumping when SIGUSR1 is received.
221 Do checks for overruns.
223 Arguments: format and arguments, as for printf()
228 set_process_info(const char *format, ...)
230 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
235 g = string_fmt_append(&gs, "%5d ", (int)getpid());
237 va_start(ap, format);
238 if (!string_vformat(g, 0, format, ap))
241 g = string_cat(&gs, US"**** string overflowed buffer ****");
243 g = string_catn(g, US"\n", 1);
244 string_from_gstring(g);
245 process_info_len = g->ptr;
246 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
250 /***********************************************
251 * Handler for SIGTERM *
252 ***********************************************/
255 term_handler(int sig)
261 /***********************************************
262 * Handler for SIGSEGV *
263 ***********************************************/
265 #define STACKDUMP_MAX 24
267 stackdump(ucontext_t * ucontext)
269 void * buf[STACKDUMP_MAX];
271 int nptrs = backtrace(buf, STACKDUMP_MAX);
273 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace\n");
274 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
275 if ((ss = backtrace_symbols(buf, nptrs)))
277 for (int i = 0; i < nptrs; i++)
278 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s\n", ss[i]);
282 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s\n", strerror(errno));
283 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
290 segv_handler(int sig, siginfo_t * info, void * uctx)
292 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
293 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
294 switch (info->si_code)
296 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
297 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
298 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
299 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
302 if (US info->si_addr < US 4096)
303 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
305 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
306 if (process_info_len > 0)
307 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
309 signal(SIGSEGV, SIG_DFL);
314 segv_handler(int sig)
316 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
317 if (process_info_len > 0)
318 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
320 signal(SIGSEGV, SIG_DFL);
326 /*************************************************
327 * Handler for SIGUSR1 *
328 *************************************************/
330 /* SIGUSR1 causes any exim process to write to the process log details of
331 what it is currently doing. It will only be used if the OS is capable of
332 setting up a handler that causes automatic restarting of any system call
333 that is in progress at the time.
335 This function takes care to be signal-safe.
337 Argument: the signal number (SIGUSR1)
342 usr1_handler(int sig)
346 os_restarting_signal(sig, usr1_handler);
348 if (!process_log_path) return;
349 fd = log_open_as_exim(process_log_path);
351 /* If we are neither exim nor root, or if we failed to create the log file,
352 give up. There is not much useful we can do with errors, since we don't want
353 to disrupt whatever is going on outside the signal handler. */
357 (void)write(fd, process_info, process_info_len);
363 /*************************************************
365 *************************************************/
367 /* This handler is enabled most of the time that Exim is running. The handler
368 doesn't actually get used unless alarm() has been called to set a timer, to
369 place a time limit on a system call of some kind. When the handler is run, it
372 There are some other SIGALRM handlers that are used in special cases when more
373 than just a flag setting is required; for example, when reading a message's
374 input. These are normally set up in the code module that uses them, and the
375 SIGALRM handler is reset to this one afterwards.
377 Argument: the signal value (SIGALRM)
382 sigalrm_handler(int sig)
385 os_non_restarting_signal(SIGALRM, sigalrm_handler);
390 /*************************************************
391 * Sleep for a fractional time interval *
392 *************************************************/
394 /* This function is called by millisleep() and exim_wait_tick() to wait for a
395 period of time that may include a fraction of a second. The coding is somewhat
396 tedious. We do not expect setitimer() ever to fail, but if it does, the process
397 will wait for ever, so we panic in this instance. (There was a case of this
398 when a bug in a function that calls milliwait() caused it to pass invalid data.
399 That's when I added the check. :-)
401 We assume it to be not worth sleeping for under 50us; this value will
402 require revisiting as hardware advances. This avoids the issue of
403 a zero-valued timer setting meaning "never fire".
405 Argument: an itimerval structure containing the interval
410 milliwait(struct itimerval *itval)
413 sigset_t old_sigmask;
414 int save_errno = errno;
416 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
418 (void)sigemptyset(&sigmask); /* Empty mask */
419 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
420 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
421 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
422 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
423 "setitimer() failed: %s", strerror(errno));
424 (void)sigfillset(&sigmask); /* All signals */
425 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
426 (void)sigsuspend(&sigmask); /* Until SIGALRM */
427 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
429 sigalrm_seen = FALSE;
435 /*************************************************
436 * Millisecond sleep function *
437 *************************************************/
439 /* The basic sleep() function has a granularity of 1 second, which is too rough
440 in some cases - for example, when using an increasing delay to slow down
443 Argument: number of millseconds
450 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
451 .it_value = {.tv_sec = msec/1000,
452 .tv_usec = (msec % 1000) * 1000}};
458 /*************************************************
459 * Compare microsecond times *
460 *************************************************/
467 Returns: -1, 0, or +1
471 exim_tvcmp(struct timeval *t1, struct timeval *t2)
473 if (t1->tv_sec > t2->tv_sec) return +1;
474 if (t1->tv_sec < t2->tv_sec) return -1;
475 if (t1->tv_usec > t2->tv_usec) return +1;
476 if (t1->tv_usec < t2->tv_usec) return -1;
483 /*************************************************
484 * Clock tick wait function *
485 *************************************************/
487 #ifdef _POSIX_MONOTONIC_CLOCK
488 # ifdef CLOCK_BOOTTIME
489 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
491 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
494 /* Amount EXIM_CLOCK is behind realtime, at startup. */
495 static struct timespec offset_ts;
498 exim_clock_init(void)
501 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
502 (void)gettimeofday(&tv, NULL);
503 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
504 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
505 if (offset_ts.tv_nsec >= 0) return;
507 offset_ts.tv_nsec += 1000*1000*1000;
513 exim_gettime(struct timeval * tv)
515 #ifdef _POSIX_MONOTONIC_CLOCK
516 struct timespec now_ts;
518 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
520 now_ts.tv_sec += offset_ts.tv_sec;
521 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
524 now_ts.tv_nsec -= 1000*1000*1000;
526 tv->tv_sec = now_ts.tv_sec;
527 tv->tv_usec = now_ts.tv_nsec / 1000;
531 (void)gettimeofday(tv, NULL);
535 /* Exim uses a time + a pid to generate a unique identifier in two places: its
536 message IDs, and in file names for maildir deliveries. Because some OS now
537 re-use pids within the same second, sub-second times are now being used.
538 However, for absolute certainty, we must ensure the clock has ticked before
539 allowing the relevant process to complete. At the time of implementation of
540 this code (February 2003), the speed of processors is such that the clock will
541 invariably have ticked already by the time a process has done its job. This
542 function prepares for the time when things are faster - and it also copes with
543 clocks that go backwards.
546 prev_tv A timeval which was used to create uniqueness; its usec field
547 has been rounded down to the value of the resolution.
548 We want to be sure the current time is greater than this.
549 On return, updated to current (rounded down).
550 resolution The resolution that was used to divide the microseconds
551 (1 for maildir, larger for message ids)
557 exim_wait_tick(struct timeval * prev_tv, int resolution)
559 struct timeval now_tv;
560 long int now_true_usec;
562 exim_gettime(&now_tv);
563 now_true_usec = now_tv.tv_usec;
564 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
566 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
568 struct itimerval itval;
569 itval.it_interval.tv_sec = 0;
570 itval.it_interval.tv_usec = 0;
571 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
572 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
574 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
575 negative value for the microseconds is possible only in the case when "now"
576 is more than a second less than "tgt". That means that itval.it_value.tv_sec
577 is greater than zero. The following correction is therefore safe. */
579 if (itval.it_value.tv_usec < 0)
581 itval.it_value.tv_usec += 1000000;
582 itval.it_value.tv_sec -= 1;
585 DEBUG(D_transport|D_receive)
587 if (!f.running_in_test_harness)
589 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
590 prev_tv->tv_sec, (long) prev_tv->tv_usec,
591 now_tv.tv_sec, (long) now_tv.tv_usec);
592 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
593 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
599 /* Be prapared to go around if the kernel does not implement subtick
600 granularity (GNU Hurd) */
602 exim_gettime(&now_tv);
603 now_true_usec = now_tv.tv_usec;
604 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
612 /*************************************************
613 * Call fopen() with umask 777 and adjust mode *
614 *************************************************/
616 /* Exim runs with umask(0) so that files created with open() have the mode that
617 is specified in the open() call. However, there are some files, typically in
618 the spool directory, that are created with fopen(). They end up world-writeable
619 if no precautions are taken. Although the spool directory is not accessible to
620 the world, this is an untidiness. So this is a wrapper function for fopen()
621 that sorts out the mode of the created file.
624 filename the file name
625 options the fopen() options
626 mode the required mode
628 Returns: the fopened FILE or NULL
632 modefopen(const uschar *filename, const char *options, mode_t mode)
634 mode_t saved_umask = umask(0777);
635 FILE *f = Ufopen(filename, options);
636 (void)umask(saved_umask);
637 if (f != NULL) (void)fchmod(fileno(f), mode);
642 /*************************************************
643 * Ensure stdin, stdout, and stderr exist *
644 *************************************************/
646 /* Some operating systems grumble if an exec() happens without a standard
647 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
648 file will be opened and will use these fd values, and then some other bit of
649 code will assume, for example, that it can write error messages to stderr.
650 This function ensures that fds 0, 1, and 2 are open if they do not already
651 exist, by connecting them to /dev/null.
653 This function is also used to ensure that std{in,out,err} exist at all times,
654 so that if any library that Exim calls tries to use them, it doesn't crash.
665 for (int i = 0; i <= 2; i++)
667 if (fstat(i, &statbuf) < 0 && errno == EBADF)
669 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
670 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
671 string_open_failed("/dev/null", NULL));
672 if (devnull != i) (void)dup2(devnull, i);
675 if (devnull > 2) (void)close(devnull);
681 /*************************************************
682 * Close unwanted file descriptors for delivery *
683 *************************************************/
685 /* This function is called from a new process that has been forked to deliver
686 an incoming message, either directly, or using exec.
688 We want any smtp input streams to be closed in this new process. However, it
689 has been observed that using fclose() here causes trouble. When reading in -bS
690 input, duplicate copies of messages have been seen. The files will be sharing a
691 file pointer with the parent process, and it seems that fclose() (at least on
692 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
693 least sometimes. Hence we go for closing the underlying file descriptors.
695 If TLS is active, we want to shut down the TLS library, but without molesting
696 the parent's SSL connection.
698 For delivery of a non-SMTP message, we want to close stdin and stdout (and
699 stderr unless debugging) because the calling process might have set them up as
700 pipes and be waiting for them to close before it waits for the submission
701 process to terminate. If they aren't closed, they hold up the calling process
702 until the initial delivery process finishes, which is not what we want.
704 Exception: We do want it for synchronous delivery!
706 And notwithstanding all the above, if D_resolver is set, implying resolver
707 debugging, leave stdout open, because that's where the resolver writes its
710 When we close stderr (which implies we've also closed stdout), we also get rid
711 of any controlling terminal.
723 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
725 (void)close(fileno(smtp_in));
726 (void)close(fileno(smtp_out));
731 (void)close(0); /* stdin */
732 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
733 if (debug_selector == 0) /* stderr */
735 if (!f.synchronous_delivery)
748 /*************************************************
750 *************************************************/
752 /* This function sets a new uid and gid permanently, optionally calling
753 initgroups() to set auxiliary groups. There are some special cases when running
754 Exim in unprivileged modes. In these situations the effective uid will not be
755 root; if we already have the right effective uid/gid, and don't need to
756 initialize any groups, leave things as they are.
761 igflag TRUE if initgroups() wanted
762 msg text to use in debugging output and failure log
764 Returns: nothing; bombs out on failure
768 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
770 uid_t euid = geteuid();
771 gid_t egid = getegid();
773 if (euid == root_uid || euid != uid || egid != gid || igflag)
775 /* At least one OS returns +1 for initgroups failure, so just check for
780 struct passwd *pw = getpwuid(uid);
782 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
783 "no passwd entry for uid=%ld", (long int)uid);
785 if (initgroups(pw->pw_name, gid) != 0)
786 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
787 (long int)uid, strerror(errno));
790 if (setgid(gid) < 0 || setuid(uid) < 0)
791 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
792 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
795 /* Debugging output included uid/gid and all groups */
799 int group_count, save_errno;
800 gid_t group_list[EXIM_GROUPLIST_SIZE];
801 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
802 (long int)geteuid(), (long int)getegid(), (long int)getpid());
803 group_count = getgroups(nelem(group_list), group_list);
805 debug_printf(" auxiliary group list:");
807 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
808 else if (group_count < 0)
809 debug_printf(" <error: %s>", strerror(save_errno));
810 else debug_printf(" <none>");
818 /*************************************************
820 *************************************************/
822 /* Exim exits via this function so that it always clears up any open
828 Returns: does not return
837 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
838 ">>>>>>>>>>>>>>>>\n",
839 (int)getpid(), process_purpose, rc);
845 exim_underbar_exit(int rc)
849 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
850 ">>>>>>>>>>>>>>>>\n",
851 (int)getpid(), process_purpose, rc);
857 /* Print error string, then die */
859 exim_fail(const char * fmt, ...)
863 vfprintf(stderr, fmt, ap);
867 /* fail if a length is too long */
869 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
871 if (itemlen <= maxlen)
873 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
874 itemlen, maxlen, description);
878 /* only pass through the string item back to the caller if it's short enough */
879 static inline const uschar *
880 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
882 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
886 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
887 of chown()/fchown(). See src/functions.h for more explanation */
889 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
891 int saved_errno = errno; /* from the preceeding chown call */
893 log_write(0, LOG_MAIN|LOG_PANIC,
894 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
895 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
896 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
898 /* I leave this here, commented, in case the "bug"(?) comes up again.
899 It is not an Exim bug, but we can provide a workaround.
905 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
907 if (buf.st_uid == owner && buf.st_gid == group) return 0;
908 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
910 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
918 /*************************************************
919 * Extract port from host address *
920 *************************************************/
922 /* Called to extract the port from the values given to -oMa and -oMi.
923 It also checks the syntax of the address, and terminates it before the
924 port data when a port is extracted.
927 address the address, with possible port on the end
929 Returns: the port, or zero if there isn't one
930 bombs out on a syntax error
934 check_port(uschar *address)
936 int port = host_address_extract_port(address);
937 if (string_is_ip_address(address, NULL) == 0)
938 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
944 /*************************************************
945 * Test/verify an address *
946 *************************************************/
948 /* This function is called by the -bv and -bt code. It extracts a working
949 address from a full RFC 822 address. This isn't really necessary per se, but it
950 has the effect of collapsing source routes.
954 flags flag bits for verify_address()
955 exit_value to be set for failures
961 test_address(uschar *s, int flags, int *exit_value)
963 int start, end, domain;
964 uschar *parse_error = NULL;
965 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
969 fprintf(stdout, "syntax error: %s\n", parse_error);
974 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
975 -1, -1, NULL, NULL, NULL);
976 if (rc == FAIL) *exit_value = 2;
977 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
983 /*************************************************
984 * Show supported features *
985 *************************************************/
988 show_string(BOOL is_stdout, gstring * g)
990 const uschar * s = string_from_gstring(g);
992 if (is_stdout) fputs(CCS s, stdout);
993 else debug_printf("%s", s);
998 show_db_version(gstring * g)
1000 #ifdef DB_VERSION_STRING
1003 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
1004 g = string_fmt_append(g, " Runtime: %s\n",
1005 db_version(NULL, NULL, NULL));
1008 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
1010 #elif defined(BTREEVERSION) && defined(HASHVERSION)
1012 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
1014 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
1017 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
1018 g = string_cat(g, US"Probably ndbm\n");
1019 #elif defined(USE_TDB)
1020 g = string_cat(g, US"Using tdb\n");
1023 g = string_cat(g, US"Probably GDBM (native mode)\n");
1025 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1032 /* This function is called for -bV/--version and for -d to output the optional
1033 features of the current Exim binary.
1035 Arguments: BOOL, true for stdout else debug channel
1040 show_whats_supported(BOOL is_stdout)
1042 rmark reset_point = store_mark();
1045 DEBUG(D_any) {} else g = show_db_version(g);
1047 g = string_cat(g, US"Support for:");
1048 #ifdef SUPPORT_CRYPTEQ
1049 g = string_cat(g, US" crypteq");
1052 g = string_cat(g, US" iconv()");
1055 g = string_cat(g, US" IPv6");
1057 #ifdef HAVE_SETCLASSRESOURCES
1058 g = string_cat(g, US" use_setclassresources");
1061 g = string_cat(g, US" PAM");
1064 g = string_cat(g, US" Perl");
1066 #ifdef EXPAND_DLFUNC
1067 g = string_cat(g, US" Expand_dlfunc");
1069 #ifdef USE_TCP_WRAPPERS
1070 g = string_cat(g, US" TCPwrappers");
1073 g = string_cat(g, US" GnuTLS");
1076 g = string_cat(g, US" OpenSSL");
1078 #ifndef DISABLE_TLS_RESUME
1079 g = string_cat(g, US" TLS_resume");
1081 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1082 g = string_cat(g, US" translate_ip_address");
1084 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1085 g = string_cat(g, US" move_frozen_messages");
1087 #ifdef WITH_CONTENT_SCAN
1088 g = string_cat(g, US" Content_Scanning");
1091 g = string_cat(g, US" DANE");
1093 #ifndef DISABLE_DKIM
1094 g = string_cat(g, US" DKIM");
1096 #ifdef SUPPORT_DMARC
1097 g = string_cat(g, US" DMARC");
1099 #ifndef DISABLE_DNSSEC
1100 g = string_cat(g, US" DNSSEC");
1102 #ifndef DISABLE_EVENT
1103 g = string_cat(g, US" Event");
1106 g = string_cat(g, US" I18N");
1108 #ifndef DISABLE_OCSP
1109 g = string_cat(g, US" OCSP");
1111 #ifndef DISABLE_PIPE_CONNECT
1112 g = string_cat(g, US" PIPECONNECT");
1114 #ifndef DISABLE_PRDR
1115 g = string_cat(g, US" PRDR");
1117 #ifdef SUPPORT_PROXY
1118 g = string_cat(g, US" PROXY");
1120 #ifndef DISABLE_QUEUE_RAMP
1121 g = string_cat(g, US" Queue_Ramp");
1123 #ifdef SUPPORT_SOCKS
1124 g = string_cat(g, US" SOCKS");
1127 g = string_cat(g, US" SPF");
1129 #if defined(SUPPORT_SRS)
1130 g = string_cat(g, US" SRS");
1134 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1136 #ifdef EXPERIMENTAL_ARC
1137 g = string_cat(g, US" Experimental_ARC");
1139 #ifdef EXPERIMENTAL_BRIGHTMAIL
1140 g = string_cat(g, US" Experimental_Brightmail");
1142 #ifdef EXPERIMENTAL_DCC
1143 g = string_cat(g, US" Experimental_DCC");
1145 #ifdef EXPERIMENTAL_DSN_INFO
1146 g = string_cat(g, US" Experimental_DSN_info");
1148 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1149 g = string_cat(g, US" Experimental_ESMTP_Limits");
1151 #ifdef EXPERIMENTAL_QUEUEFILE
1152 g = string_cat(g, US" Experimental_QUEUEFILE");
1154 g = string_cat(g, US"\n");
1156 g = string_cat(g, US"Lookups (built-in):");
1157 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1158 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1160 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1161 g = string_cat(g, US" cdb");
1163 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1164 g = string_cat(g, US" dbm dbmjz dbmnz");
1166 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1167 g = string_cat(g, US" dnsdb");
1169 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1170 g = string_cat(g, US" dsearch");
1172 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1173 g = string_cat(g, US" ibase");
1175 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1176 g = string_cat(g, US" json");
1178 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1179 g = string_cat(g, US" ldap ldapdn ldapm");
1182 g = string_cat(g, US" lmdb");
1184 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1185 g = string_cat(g, US" mysql");
1187 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1188 g = string_cat(g, US" nis nis0");
1190 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1191 g = string_cat(g, US" nisplus");
1193 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1194 g = string_cat(g, US" oracle");
1196 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1197 g = string_cat(g, US" passwd");
1199 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1200 g = string_cat(g, US" pgsql");
1202 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1203 g = string_cat(g, US" redis");
1205 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1206 g = string_cat(g, US" sqlite");
1208 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1209 g = string_cat(g, US" testdb");
1211 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1212 g = string_cat(g, US" whoson");
1214 g = string_cat(g, US"\n");
1216 g = auth_show_supported(g);
1217 g = route_show_supported(g);
1218 g = transport_show_supported(g);
1220 #ifdef WITH_CONTENT_SCAN
1221 g = malware_show_supported(g);
1223 show_string(is_stdout, g); g = NULL;
1225 if (fixed_never_users[0] > 0)
1228 g = string_cat(g, US"Fixed never_users: ");
1229 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1230 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1231 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1234 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1236 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1238 /* Everything else is details which are only worth reporting when debugging.
1239 Perhaps the tls_version_report should move into this too. */
1243 /* clang defines __GNUC__ (at least, for me) so test for it first */
1244 #if defined(__clang__)
1245 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1246 #elif defined(__GNUC__)
1247 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1251 "? unknown version ?"
1255 g = string_cat(g, US"Compiler: <unknown>\n");
1258 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1259 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1260 __GLIBC__, __GLIBC_MINOR__);
1261 if (__GLIBC_PREREQ(2, 1))
1262 g = string_fmt_append(g, " Runtime: %s\n",
1263 gnu_get_libc_version());
1266 g = show_db_version(g);
1269 g = tls_version_report(g);
1272 g = utf8_version_report(g);
1274 #ifdef SUPPORT_DMARC
1275 g = dmarc_version_report(g);
1278 g = spf_lib_version_report(g);
1281 show_string(is_stdout, g);
1284 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1285 if (authi->version_report)
1286 g = (*authi->version_report)(g);
1288 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1289 characters; unless it's an ancient version of PCRE in which case it
1291 #ifndef PCRE_PRERELEASE
1292 # define PCRE_PRERELEASE
1295 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1298 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1299 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1301 PCRE2_MAJOR, PCRE2_MINOR,
1302 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1306 #undef EXPAND_AND_QUOTE
1308 show_string(is_stdout, g);
1312 for (int i = 0; i < lookup_list_count; i++)
1313 if (lookup_list[i]->version_report)
1314 g = lookup_list[i]->version_report(g);
1315 show_string(is_stdout, g);
1318 #ifdef WHITELIST_D_MACROS
1319 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1321 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1323 #ifdef TRUSTED_CONFIG_LIST
1324 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1326 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1330 show_string(is_stdout, g);
1331 store_reset(reset_point);
1335 /*************************************************
1336 * Show auxiliary information about Exim *
1337 *************************************************/
1340 show_exim_information(enum commandline_info request, FILE *stream)
1345 fprintf(stream, "Oops, something went wrong.\n");
1349 "The -bI: flag takes a string indicating which information to provide.\n"
1350 "If the string is not recognised, you'll get this help (on stderr).\n"
1352 " exim -bI:help this information\n"
1353 " exim -bI:dscp list of known dscp value keywords\n"
1354 " exim -bI:sieve list of supported sieve extensions\n"
1358 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1359 fprintf(stream, "%s\n", *pp);
1362 dscp_list_to_stream(stream);
1368 /*************************************************
1369 * Quote a local part *
1370 *************************************************/
1372 /* This function is used when a sender address or a From: or Sender: header
1373 line is being created from the caller's login, or from an authenticated_id. It
1374 applies appropriate quoting rules for a local part.
1376 Argument: the local part
1377 Returns: the local part, quoted if necessary
1381 local_part_quote(uschar *lpart)
1383 BOOL needs_quote = FALSE;
1386 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1388 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1389 (*t != '.' || t == lpart || t[1] == 0);
1392 if (!needs_quote) return lpart;
1394 g = string_catn(NULL, US"\"", 1);
1398 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1401 g = string_cat(g, lpart);
1404 g = string_catn(g, lpart, nq - lpart);
1405 g = string_catn(g, US"\\", 1);
1406 g = string_catn(g, nq, 1);
1410 g = string_catn(g, US"\"", 1);
1411 return string_from_gstring(g);
1417 /*************************************************
1418 * Load readline() functions *
1419 *************************************************/
1421 /* This function is called from testing executions that read data from stdin,
1422 but only when running as the calling user. Currently, only -be does this. The
1423 function loads the readline() function library and passes back the functions.
1424 On some systems, it needs the curses library, so load that too, but try without
1425 it if loading fails. All this functionality has to be requested at build time.
1428 fn_readline_ptr pointer to where to put the readline pointer
1429 fn_addhist_ptr pointer to where to put the addhistory function
1431 Returns: the dlopen handle or NULL on failure
1435 set_readline(char * (**fn_readline_ptr)(const char *),
1436 void (**fn_addhist_ptr)(const char *))
1439 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1441 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1442 if (dlhandle_curses) dlclose(dlhandle_curses);
1446 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1447 * char * readline (const char *prompt);
1448 * void add_history (const char *string);
1450 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1451 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1454 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1462 /*************************************************
1463 * Get a line from stdin for testing things *
1464 *************************************************/
1466 /* This function is called when running tests that can take a number of lines
1467 of input (for example, -be and -bt). It handles continuations and trailing
1468 spaces. And prompting and a blank line output on eof. If readline() is in use,
1469 the arguments are non-NULL and provide the relevant functions.
1472 fn_readline readline function or NULL
1473 fn_addhist addhist function or NULL
1475 Returns: pointer to dynamic memory, or NULL at end of file
1479 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1482 BOOL had_input = FALSE;
1484 if (!fn_readline) { printf("> "); fflush(stdout); }
1486 for (int i = 0;; i++)
1488 uschar buffer[1024];
1492 char *readline_line = NULL;
1495 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1496 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1497 p = US readline_line;
1502 /* readline() not in use */
1505 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1509 /* Handle the line */
1512 ss = p + Ustrlen(p);
1513 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1516 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1518 g = string_catn(g, p, ss - p);
1521 if (fn_readline) free(readline_line);
1524 /* g can only be NULL if ss==p */
1525 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1528 --g->ptr; /* drop the \ */
1531 if (had_input) return g ? string_from_gstring(g) : US"";
1538 /*************************************************
1539 * Output usage information for the program *
1540 *************************************************/
1542 /* This function is called when there are no recipients
1543 or a specific --help argument was added.
1546 progname information on what name we were called by
1548 Returns: DOES NOT RETURN
1552 exim_usage(uschar *progname)
1555 /* Handle specific program invocation variants */
1556 if (Ustrcmp(progname, US"-mailq") == 0)
1558 "mailq - list the contents of the mail queue\n\n"
1559 "For a list of options, see the Exim documentation.\n");
1561 /* Generic usage - we output this whatever happens */
1563 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1564 "not directly from a shell command line. Options and/or arguments control\n"
1565 "what it does when called. For a list of options, see the Exim documentation.\n");
1570 /*************************************************
1571 * Validate that the macros given are okay *
1572 *************************************************/
1574 /* Typically, Exim will drop privileges if macros are supplied. In some
1575 cases, we want to not do so.
1577 Arguments: opt_D_used - true if the commandline had a "-D" option
1578 Returns: true if trusted, false otherwise
1582 macros_trusted(BOOL opt_D_used)
1584 #ifdef WHITELIST_D_MACROS
1585 uschar *whitelisted, *end, *p, **whites;
1586 int white_count, i, n;
1588 BOOL prev_char_item, found;
1593 #ifndef WHITELIST_D_MACROS
1597 /* We only trust -D overrides for some invoking users:
1598 root, the exim run-time user, the optional config owner user.
1599 I don't know why config-owner would be needed, but since they can own the
1600 config files anyway, there's no security risk to letting them override -D. */
1601 if ( ! ((real_uid == root_uid)
1602 || (real_uid == exim_uid)
1603 #ifdef CONFIGURE_OWNER
1604 || (real_uid == config_uid)
1608 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1612 /* Get a list of macros which are whitelisted */
1613 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1614 prev_char_item = FALSE;
1616 for (p = whitelisted; *p != '\0'; ++p)
1618 if (*p == ':' || isspace(*p))
1623 prev_char_item = FALSE;
1626 if (!prev_char_item)
1627 prev_char_item = TRUE;
1634 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1635 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1640 if (i == white_count)
1642 while (*p != '\0' && p < end)
1648 /* The list of commandline macros should be very short.
1649 Accept the N*M complexity. */
1650 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1653 for (uschar ** w = whites; *w; ++w)
1654 if (Ustrcmp(*w, m->name) == 0)
1661 if (!m->replacement)
1663 if ((len = m->replen) == 0)
1665 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1668 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1674 /*************************************************
1675 * Expansion testing *
1676 *************************************************/
1678 /* Expand and print one item, doing macro-processing.
1681 item line for expansion
1685 expansion_test_line(const uschar * line)
1691 Ustrncpy(big_buffer, line, big_buffer_size);
1692 big_buffer[big_buffer_size-1] = '\0';
1693 len = Ustrlen(big_buffer);
1695 (void) macros_expand(0, &len, &dummy_macexp);
1697 if (isupper(big_buffer[0]))
1699 if (macro_read_assignment(big_buffer))
1700 printf("Defined macro '%s'\n", mlast->name);
1703 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1704 else printf("Failed: %s\n", expand_string_message);
1709 /*************************************************
1710 * Entry point and high-level code *
1711 *************************************************/
1713 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1714 the appropriate action. All the necessary functions are present in the one
1715 binary. I originally thought one should split it up, but it turns out that so
1716 much of the apparatus is needed in each chunk that one might as well just have
1717 it all available all the time, which then makes the coding easier as well.
1720 argc count of entries in argv
1721 argv argument strings, with argv[0] being the program name
1723 Returns: EXIT_SUCCESS if terminated successfully
1724 EXIT_FAILURE otherwise, except when a message has been sent
1725 to the sender, and -oee was given
1729 main(int argc, char **cargv)
1731 uschar **argv = USS cargv;
1732 int arg_receive_timeout = -1;
1733 int arg_smtp_receive_timeout = -1;
1734 int arg_error_handling = error_handling;
1735 int filter_sfd = -1;
1736 int filter_ufd = -1;
1739 int list_queue_option = 0;
1741 int msg_action_arg = -1;
1742 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1743 int queue_only_reason = 0;
1745 int perl_start_option = 0;
1747 int recipients_arg = argc;
1748 int sender_address_domain = 0;
1749 int test_retry_arg = -1;
1750 int test_rewrite_arg = -1;
1751 gid_t original_egid;
1752 BOOL arg_queue_only = FALSE;
1753 BOOL bi_option = FALSE;
1754 BOOL checking = FALSE;
1755 BOOL count_queue = FALSE;
1756 BOOL expansion_test = FALSE;
1757 BOOL extract_recipients = FALSE;
1758 BOOL flag_G = FALSE;
1759 BOOL flag_n = FALSE;
1760 BOOL forced_delivery = FALSE;
1761 BOOL f_end_dot = FALSE;
1762 BOOL deliver_give_up = FALSE;
1763 BOOL list_queue = FALSE;
1764 BOOL list_options = FALSE;
1765 BOOL list_config = FALSE;
1766 BOOL local_queue_only;
1767 BOOL one_msg_action = FALSE;
1768 BOOL opt_D_used = FALSE;
1769 BOOL queue_only_set = FALSE;
1770 BOOL receiving_message = TRUE;
1771 BOOL sender_ident_set = FALSE;
1772 BOOL session_local_queue_only;
1774 BOOL removed_privilege = FALSE;
1775 BOOL usage_wanted = FALSE;
1776 BOOL verify_address_mode = FALSE;
1777 BOOL verify_as_sender = FALSE;
1778 BOOL rcpt_verify_quota = FALSE;
1779 BOOL version_printed = FALSE;
1780 uschar *alias_arg = NULL;
1781 uschar *called_as = US"";
1782 uschar *cmdline_syslog_name = NULL;
1783 uschar *start_queue_run_id = NULL;
1784 uschar *stop_queue_run_id = NULL;
1785 uschar *expansion_test_message = NULL;
1786 const uschar *ftest_domain = NULL;
1787 const uschar *ftest_localpart = NULL;
1788 const uschar *ftest_prefix = NULL;
1789 const uschar *ftest_suffix = NULL;
1790 uschar *log_oneline = NULL;
1791 uschar *malware_test_file = NULL;
1792 uschar *real_sender_address;
1793 uschar *originator_home = US"/";
1797 struct stat statbuf;
1798 pid_t passed_qr_pid = (pid_t)0;
1799 int passed_qr_pipe = -1;
1800 gid_t group_list[EXIM_GROUPLIST_SIZE];
1802 /* For the -bI: flag */
1803 enum commandline_info info_flag = CMDINFO_NONE;
1804 BOOL info_stdout = FALSE;
1806 /* Possible options for -R and -S */
1808 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1810 /* Need to define this in case we need to change the environment in order
1811 to get rid of a bogus time zone. We have to make it char rather than uschar
1812 because some OS define it in /usr/include/unistd.h. */
1814 extern char **environ;
1816 #ifdef MEASURE_TIMING
1817 (void)gettimeofday(×tamp_startup, NULL);
1820 store_init(); /* Initialise the memory allocation susbsystem */
1821 pcre_init(); /* Set up memory handling for pcre */
1823 /* If the Exim user and/or group and/or the configuration file owner/group were
1824 defined by ref:name at build time, we must now find the actual uid/gid values.
1825 This is a feature to make the lives of binary distributors easier. */
1827 #ifdef EXIM_USERNAME
1828 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1831 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1833 /* If ref:name uses a number as the name, route_finduser() returns
1834 TRUE with exim_uid set and pw coerced to NULL. */
1836 exim_gid = pw->pw_gid;
1837 #ifndef EXIM_GROUPNAME
1840 "exim: ref:name should specify a usercode, not a group.\n"
1841 "exim: can't let you get away with it unless you also specify a group.\n");
1845 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1848 #ifdef EXIM_GROUPNAME
1849 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1850 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1853 #ifdef CONFIGURE_OWNERNAME
1854 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1855 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1856 CONFIGURE_OWNERNAME);
1859 /* We default the system_filter_user to be the Exim run-time user, as a
1860 sane non-root value. */
1861 system_filter_uid = exim_uid;
1863 #ifdef CONFIGURE_GROUPNAME
1864 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1865 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1866 CONFIGURE_GROUPNAME);
1869 /* In the Cygwin environment, some initialization used to need doing.
1870 It was fudged in by means of this macro; now no longer but we'll leave
1871 it in case of others. */
1877 /* Check a field which is patched when we are running Exim within its
1878 testing harness; do a fast initial check, and then the whole thing. */
1880 f.running_in_test_harness =
1881 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1882 if (f.running_in_test_harness)
1885 /* Protect against abusive argv[0] */
1886 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1887 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1889 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1890 at the start of a program; however, it seems that some environments do not
1891 follow this. A "strange" locale can affect the formatting of timestamps, so we
1894 setlocale(LC_ALL, "C");
1896 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1898 #ifdef _POSIX_MONOTONIC_CLOCK
1902 /* Set up the default handler for timing using alarm(). */
1904 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1906 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1907 because store_malloc writes a log entry on failure. */
1909 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1910 exim_fail("exim: failed to get store for log buffer\n");
1912 /* Initialize the default log options. */
1914 bits_set(log_selector, log_selector_size, log_default);
1916 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1917 NULL when the daemon is run and the file is closed. We have to use this
1918 indirection, because some systems don't allow writing to the variable "stderr".
1921 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1923 /* Ensure there is a big buffer for temporary use in several places. It is put
1924 in malloc store so that it can be freed for enlargement if necessary. */
1926 big_buffer = store_malloc(big_buffer_size);
1928 /* Set up the handler for the data request signal, and set the initial
1929 descriptive text. */
1931 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1932 set_process_info("initializing");
1933 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1936 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1937 sigaction(SIGSEGV, &act, NULL);
1940 signal(SIGSEGV, segv_handler); /* log faults */
1943 /* If running in a dockerized environment, the TERM signal is only
1944 delegated to the PID 1 if we request it by setting an signal handler */
1945 if (getpid() == 1) signal(SIGTERM, term_handler);
1947 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1948 in the daemon code. For the rest of Exim's uses, we ignore it. */
1950 signal(SIGHUP, SIG_IGN);
1952 /* We don't want to die on pipe errors as the code is written to handle
1953 the write error instead. */
1955 signal(SIGPIPE, SIG_IGN);
1957 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1958 set to SIG_IGN. This causes subprocesses that complete before the parent
1959 process waits for them not to hang around, so when Exim calls wait(), nothing
1960 is there. The wait() code has been made robust against this, but let's ensure
1961 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1962 ending status. We use sigaction rather than plain signal() on those OS where
1963 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1964 problem on AIX with this.) */
1968 struct sigaction act;
1969 act.sa_handler = SIG_DFL;
1970 sigemptyset(&(act.sa_mask));
1972 sigaction(SIGCHLD, &act, NULL);
1975 signal(SIGCHLD, SIG_DFL);
1978 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1983 /* Set up the version number. Set up the leading 'E' for the external form of
1984 message ids, set the pointer to the internal form, and initialize it to
1985 indicate no message being processed. */
1988 message_id_option[0] = '-';
1989 message_id_external = message_id_option + 1;
1990 message_id_external[0] = 'E';
1991 message_id = message_id_external + 1;
1994 /* Set the umask to zero so that any files Exim creates using open() are
1995 created with the modes that it specifies. NOTE: Files created with fopen() have
1996 a problem, which was not recognized till rather late (February 2006). With this
1997 umask, such files will be world writeable. (They are all content scanning files
1998 in the spool directory, which isn't world-accessible, so this is not a
1999 disaster, but it's untidy.) I don't want to change this overall setting,
2000 however, because it will interact badly with the open() calls. Instead, there's
2001 now a function called modefopen() that fiddles with the umask while calling
2006 /* Precompile the regular expression for matching a message id. Keep this in
2007 step with the code that generates ids in the accept.c module. We need to do
2008 this here, because the -M options check their arguments for syntactic validity
2009 using mac_ismsgid, which uses this. */
2012 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
2014 /* Precompile the regular expression that is used for matching an SMTP error
2015 code, possibly extended, at the start of an error message. Note that the
2016 terminating whitespace character is included. */
2019 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2022 #ifdef WHITELIST_D_MACROS
2023 /* Precompile the regular expression used to filter the content of macros
2024 given to -D for permissibility. */
2026 regex_whitelisted_macro =
2027 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2030 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2032 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2033 this seems to be a generally accepted convention, since one finds symbolic
2034 links called "mailq" in standard OS configurations. */
2036 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2037 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2040 receiving_message = FALSE;
2041 called_as = US"-mailq";
2044 /* If the program is called as "rmail" treat it as equivalent to
2045 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2046 i.e. preventing a single dot on a line from terminating the message, and
2047 returning with zero return code, even in cases of error (provided an error
2048 message has been sent). */
2050 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2051 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2054 called_as = US"-rmail";
2055 errors_sender_rc = EXIT_SUCCESS;
2058 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2059 this is a smail convention. */
2061 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2062 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2064 smtp_input = smtp_batched_input = TRUE;
2065 called_as = US"-rsmtp";
2068 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2069 this is a smail convention. */
2071 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2072 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2075 receiving_message = FALSE;
2076 called_as = US"-runq";
2079 /* If the program is called as "newaliases" treat it as equivalent to
2080 "exim -bi"; this is a sendmail convention. */
2082 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2083 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2086 receiving_message = FALSE;
2087 called_as = US"-newaliases";
2090 /* Save the original effective uid for a couple of uses later. It should
2091 normally be root, but in some esoteric environments it may not be. */
2093 original_euid = geteuid();
2094 original_egid = getegid();
2096 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2097 to be the same as the real ones. This makes a difference only if Exim is setuid
2098 (or setgid) to something other than root, which could be the case in some
2099 special configurations. */
2101 real_uid = getuid();
2102 real_gid = getgid();
2104 if (real_uid == root_uid)
2106 if ((rv = setgid(real_gid)))
2107 exim_fail("exim: setgid(%ld) failed: %s\n",
2108 (long int)real_gid, strerror(errno));
2109 if ((rv = setuid(real_uid)))
2110 exim_fail("exim: setuid(%ld) failed: %s\n",
2111 (long int)real_uid, strerror(errno));
2114 /* If neither the original real uid nor the original euid was root, Exim is
2115 running in an unprivileged state. */
2117 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2119 /* For most of the args-parsing we need to use permanent pool memory */
2121 int old_pool = store_pool;
2122 store_pool = POOL_PERM;
2124 /* Scan the program's arguments. Some can be dealt with right away; others are
2125 simply recorded for checking and handling afterwards. Do a high-level switch
2126 on the second character (the one after '-'), to save some effort. */
2128 for (i = 1; i < argc; i++)
2130 BOOL badarg = FALSE;
2131 uschar * arg = argv[i];
2135 /* An argument not starting with '-' is the start of a recipients list;
2136 break out of the options-scanning loop. */
2144 /* An option consisting of -- terminates the options */
2146 if (Ustrcmp(arg, "--") == 0)
2148 recipients_arg = i + 1;
2152 /* Handle flagged options */
2154 switchchar = arg[1];
2157 /* Make all -ex options synonymous with -oex arguments, since that
2158 is assumed by various callers. Also make -qR options synonymous with -R
2159 options, as that seems to be required as well. Allow for -qqR too, and
2160 the same for -S options. */
2162 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2163 Ustrncmp(arg+1, "qR", 2) == 0 ||
2164 Ustrncmp(arg+1, "qS", 2) == 0)
2166 switchchar = arg[2];
2169 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2171 switchchar = arg[3];
2173 f.queue_2stage = TRUE;
2176 /* Make -r synonymous with -f, since it is a documented alias */
2178 else if (arg[1] == 'r') switchchar = 'f';
2180 /* Make -ov synonymous with -v */
2182 else if (Ustrcmp(arg, "-ov") == 0)
2188 /* deal with --option_aliases */
2189 else if (switchchar == '-')
2191 if (Ustrcmp(argrest, "help") == 0)
2193 usage_wanted = TRUE;
2196 else if (Ustrcmp(argrest, "version") == 0)
2203 /* High-level switch on active initial letter */
2208 /* sendmail uses -Ac and -Am to control which .cf file is used;
2211 if (!*argrest) { badarg = TRUE; break; }
2214 BOOL ignore = FALSE;
2219 if (*(argrest + 1) == '\0')
2223 if (!ignore) badarg = TRUE;
2227 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2228 so has no need of it. */
2231 if (!*argrest) i++; /* Skip over the type */
2237 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2241 /* -bd: Run in daemon mode, awaiting SMTP connections.
2242 -bdf: Ditto, but in the foreground.
2245 f.daemon_listen = TRUE;
2246 if (*argrest == 'f') f.background_daemon = FALSE;
2247 else if (*argrest) badarg = TRUE;
2250 /* -be: Run in expansion test mode
2251 -bem: Ditto, but read a message from a file first
2254 expansion_test = checking = TRUE;
2255 if (*argrest == 'm')
2257 if (++i >= argc) { badarg = TRUE; break; }
2258 expansion_test_message = argv[i];
2261 if (*argrest) badarg = TRUE;
2264 /* -bF: Run system filter test */
2266 filter_test |= checking = FTEST_SYSTEM;
2267 if (*argrest) badarg = TRUE;
2268 else if (++i < argc) filter_test_sfile = argv[i];
2269 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2272 /* -bf: Run user filter test
2273 -bfd: Set domain for filter testing
2274 -bfl: Set local part for filter testing
2275 -bfp: Set prefix for filter testing
2276 -bfs: Set suffix for filter testing
2281 filter_test |= checking = FTEST_USER;
2282 if (++i < argc) filter_test_ufile = argv[i];
2283 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2288 exim_fail("exim: string expected after %s\n", arg);
2289 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2290 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2291 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2292 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2297 /* -bh: Host checking - an IP address must follow. */
2299 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2301 if (++i >= argc) { badarg = TRUE; break; }
2302 sender_host_address = string_copy_taint(
2303 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2305 host_checking = checking = f.log_testing_mode = TRUE;
2306 f.host_checking_callout = *argrest == 'c';
2307 message_logs = FALSE;
2312 /* -bi: This option is used by sendmail to initialize *the* alias file,
2313 though it has the -oA option to specify a different file. Exim has no
2314 concept of *the* alias file, but since Sun's YP make script calls
2315 sendmail this way, some support must be provided. */
2317 if (!*argrest) bi_option = TRUE;
2321 /* -bI: provide information, of the type to follow after a colon.
2322 This is an Exim flag. */
2324 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2326 uschar *p = argrest+1;
2327 info_flag = CMDINFO_HELP;
2329 if (strcmpic(p, CUS"sieve") == 0)
2331 info_flag = CMDINFO_SIEVE;
2334 else if (strcmpic(p, CUS"dscp") == 0)
2336 info_flag = CMDINFO_DSCP;
2339 else if (strcmpic(p, CUS"help") == 0)
2345 /* -bm: Accept and deliver message - the default option. Reinstate
2346 receiving_message, which got turned off for all -b options.
2347 -bmalware: test the filename given for malware */
2349 if (!*argrest) receiving_message = TRUE;
2350 else if (Ustrcmp(argrest, "alware") == 0)
2352 if (++i >= argc) { badarg = TRUE; break; }
2354 malware_test_file = argv[i];
2359 /* -bnq: For locally originating messages, do not qualify unqualified
2360 addresses. In the envelope, this causes errors; in header lines they
2363 if (Ustrcmp(argrest, "q") == 0)
2365 f.allow_unqualified_sender = FALSE;
2366 f.allow_unqualified_recipient = FALSE;
2371 /* -bpxx: List the contents of the mail queue, in various forms. If
2372 the option is -bpc, just a queue count is needed. Otherwise, if the
2373 first letter after p is r, then order is random. */
2375 if (*argrest == 'c')
2378 if (*++argrest) badarg = TRUE;
2382 if (*argrest == 'r')
2384 list_queue_option = 8;
2387 else list_queue_option = 0;
2391 /* -bp: List the contents of the mail queue, top-level only */
2395 /* -bpu: List the contents of the mail queue, top-level undelivered */
2397 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2399 /* -bpa: List the contents of the mail queue, including all delivered */
2401 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2403 /* Unknown after -bp[r] */
2409 /* -bP: List the configuration variables given as the address list.
2410 Force -v, so configuration errors get displayed. */
2413 /* -bP config: we need to setup here, because later,
2414 when list_options is checked, the config is read already */
2417 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2420 readconf_save_config(version_string);
2424 list_options = TRUE;
2425 debug_selector |= D_v;
2426 debug_file = stderr;
2430 /* -brt: Test retry configuration lookup */
2432 if (Ustrcmp(argrest, "t") == 0)
2435 test_retry_arg = i + 1;
2439 /* -brw: Test rewrite configuration */
2441 else if (Ustrcmp(argrest, "w") == 0)
2444 test_rewrite_arg = i + 1;
2450 /* -bS: Read SMTP commands on standard input, but produce no replies -
2451 all errors are reported by sending messages. */
2454 smtp_input = smtp_batched_input = receiving_message = TRUE;
2458 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2459 on standard output. */
2461 if (!*argrest) smtp_input = receiving_message = TRUE;
2465 /* -bt: address testing mode */
2468 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2472 /* -bv: verify addresses */
2475 verify_address_mode = checking = f.log_testing_mode = TRUE;
2477 /* -bvs: verify sender addresses */
2479 else if (Ustrcmp(argrest, "s") == 0)
2481 verify_address_mode = checking = f.log_testing_mode = TRUE;
2482 verify_as_sender = TRUE;
2487 /* -bV: Print version string and support details */
2491 printf("Exim version %s #%s built %s\n", version_string,
2492 version_cnumber, version_date);
2493 printf("%s\n", CS version_copyright);
2494 version_printed = TRUE;
2495 show_whats_supported(TRUE);
2496 f.log_testing_mode = TRUE;
2501 /* -bw: inetd wait mode, accept a listening socket as stdin */
2503 f.inetd_wait_mode = TRUE;
2504 f.background_daemon = FALSE;
2505 f.daemon_listen = TRUE;
2507 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2508 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2519 /* -C: change configuration file list; ignore if it isn't really
2520 a change! Enforce a prefix check if required. */
2524 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2525 if (Ustrcmp(config_main_filelist, argrest) != 0)
2527 #ifdef ALT_CONFIG_PREFIX
2529 int len = Ustrlen(ALT_CONFIG_PREFIX);
2530 const uschar *list = argrest;
2532 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2533 while((filename = string_nextinlist(&list, &sep, big_buffer,
2535 if ( ( Ustrlen(filename) < len
2536 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2537 || Ustrstr(filename, "/../") != NULL
2539 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2541 exim_fail("-C Permission denied\n");
2543 if (real_uid != root_uid)
2545 #ifdef TRUSTED_CONFIG_LIST
2547 if (real_uid != exim_uid
2548 #ifdef CONFIGURE_OWNER
2549 && real_uid != config_uid
2552 f.trusted_config = FALSE;
2555 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2558 struct stat statbuf;
2560 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2561 (statbuf.st_uid != root_uid /* owner not root */
2562 #ifdef CONFIGURE_OWNER
2563 && statbuf.st_uid != config_uid /* owner not the special one */
2566 (statbuf.st_gid != root_gid /* group not root */
2567 #ifdef CONFIGURE_GROUP
2568 && statbuf.st_gid != config_gid /* group not the special one */
2570 && (statbuf.st_mode & 020) != 0 /* group writeable */
2572 (statbuf.st_mode & 2) != 0) /* world writeable */
2574 f.trusted_config = FALSE;
2579 /* Well, the trust list at least is up to scratch... */
2581 uschar *trusted_configs[32];
2584 int old_pool = store_pool;
2585 store_pool = POOL_MAIN;
2587 reset_point = store_mark();
2588 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2590 uschar *start = big_buffer, *nl;
2591 while (*start && isspace(*start))
2595 nl = Ustrchr(start, '\n');
2598 trusted_configs[nr_configs++] = string_copy(start);
2599 if (nr_configs == nelem(trusted_configs))
2607 const uschar *list = argrest;
2609 while (f.trusted_config && (filename = string_nextinlist(&list,
2610 &sep, big_buffer, big_buffer_size)))
2612 for (i=0; i < nr_configs; i++)
2613 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2615 if (i == nr_configs)
2617 f.trusted_config = FALSE;
2622 else /* No valid prefixes found in trust_list file. */
2623 f.trusted_config = FALSE;
2624 store_reset(reset_point);
2625 store_pool = old_pool;
2628 else /* Could not open trust_list file. */
2629 f.trusted_config = FALSE;
2632 /* Not root; don't trust config */
2633 f.trusted_config = FALSE;
2637 config_main_filelist = argrest;
2638 f.config_changed = TRUE;
2643 /* -D: set up a macro definition */
2646 #ifdef DISABLE_D_OPTION
2647 exim_fail("exim: -D is not available in this Exim binary\n");
2653 uschar *s = argrest;
2656 while (isspace(*s)) s++;
2658 if (*s < 'A' || *s > 'Z')
2659 exim_fail("exim: macro name set by -D must start with "
2660 "an upper case letter\n");
2662 while (isalnum(*s) || *s == '_')
2664 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2668 if (ptr == 0) { badarg = TRUE; break; }
2669 while (isspace(*s)) s++;
2672 if (*s++ != '=') { badarg = TRUE; break; }
2673 while (isspace(*s)) s++;
2676 for (m = macros_user; m; m = m->next)
2677 if (Ustrcmp(m->name, name) == 0)
2678 exim_fail("exim: duplicated -D in command line\n");
2680 m = macro_create(name, s, TRUE);
2682 if (clmacro_count >= MAX_CLMACROS)
2683 exim_fail("exim: too many -D options on command line\n");
2684 clmacros[clmacro_count++] =
2685 string_sprintf("-D%s=%s", m->name, m->replacement);
2692 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2694 if (Ustrcmp(argrest, "ropcr") == 0)
2696 /* drop_cr = TRUE; */
2699 /* -dp: Set up a debug pretrigger buffer with given size. */
2701 else if (Ustrcmp(argrest, "p") == 0)
2705 debug_pretrigger_setup(argv[i]);
2707 /* -dt: Set a debug trigger selector */
2709 else if (Ustrncmp(argrest, "t=", 2) == 0)
2710 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2712 /* -d: Set debug level (see also -v below).
2713 If -dd is used, debugging subprocesses of the daemon is disabled. */
2717 /* Use an intermediate variable so that we don't set debugging while
2718 decoding the debugging bits. */
2720 unsigned int selector = D_default;
2723 if (*argrest == 'd')
2725 f.debug_daemon = TRUE;
2729 decode_bits(&selector, 1, debug_notall, argrest,
2730 debug_options, debug_options_count, US"debug", 0);
2731 debug_selector = selector;
2736 /* -E: This is a local error message. This option is not intended for
2737 external use at all, but is not restricted to trusted callers because it
2738 does no harm (just suppresses certain error messages) and if Exim is run
2739 not setuid root it won't always be trusted when it generates error
2740 messages using this option. If there is a message id following -E, point
2741 message_reference at it, for logging. */
2744 f.local_error_message = TRUE;
2745 if (mac_ismsgid(argrest)) message_reference = argrest;
2749 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2750 option, so it looks as if historically the -oex options are also callable
2751 without the leading -o. So we have to accept them. Before the switch,
2752 anything starting -oe has been converted to -e. Exim does not support all
2753 of the sendmail error options. */
2756 if (Ustrcmp(argrest, "e") == 0)
2758 arg_error_handling = ERRORS_SENDER;
2759 errors_sender_rc = EXIT_SUCCESS;
2761 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2762 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2763 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2764 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2769 /* -F: Set sender's full name, used instead of the gecos entry from
2770 the password file. Since users can usually alter their gecos entries,
2771 there's no security involved in using this instead. The data can follow
2772 the -F or be in the next argument. */
2776 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2777 originator_name = string_copy_taint(
2778 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2780 f.sender_name_forced = TRUE;
2784 /* -f: Set sender's address - this value is only actually used if Exim is
2785 run by a trusted user, or if untrusted_set_sender is set and matches the
2786 address, except that the null address can always be set by any user. The
2787 test for this happens later, when the value given here is ignored when not
2788 permitted. For an untrusted user, the actual sender is still put in Sender:
2789 if it doesn't match the From: header (unless no_local_from_check is set).
2790 The data can follow the -f or be in the next argument. The -r switch is an
2791 obsolete form of -f but since there appear to be programs out there that
2792 use anything that sendmail has ever supported, better accept it - the
2793 synonymizing is done before the switch above.
2795 At this stage, we must allow domain literal addresses, because we don't
2796 know what the setting of allow_domain_literals is yet. Ditto for trailing
2797 dots and strip_trailing_dot. */
2801 int dummy_start, dummy_end;
2804 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2805 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2807 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2810 uschar * temp = argrest + Ustrlen(argrest) - 1;
2811 while (temp >= argrest && isspace(*temp)) temp--;
2812 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2813 allow_domain_literals = TRUE;
2814 strip_trailing_dot = TRUE;
2816 allow_utf8_domains = TRUE;
2818 if (!(sender_address = parse_extract_address(argrest, &errmess,
2819 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2820 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2822 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2824 message_smtputf8 = string_is_utf8(sender_address);
2825 allow_utf8_domains = FALSE;
2827 allow_domain_literals = FALSE;
2828 strip_trailing_dot = FALSE;
2830 f.sender_address_forced = TRUE;
2834 /* -G: sendmail invocation to specify that it's a gateway submission and
2835 sendmail may complain about problems instead of fixing them.
2836 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2837 not at this time complain about problems. */
2843 /* -h: Set the hop count for an incoming message. Exim does not currently
2844 support this; it always computes it by counting the Received: headers.
2845 To put it in will require a change to the spool header file format. */
2849 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2850 if (!isdigit(*argrest)) badarg = TRUE;
2854 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2855 not to be documented for sendmail but mailx (at least) uses it) */
2858 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2862 /* -L: set the identifier used for syslog; equivalent to setting
2863 syslog_processname in the config file, but needs to be an admin option. */
2867 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2868 if ((sz = Ustrlen(argrest)) > 32)
2869 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2871 exim_fail("exim: the -L syslog name is too short\n");
2872 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2876 receiving_message = FALSE;
2878 /* -MC: continue delivery of another message via an existing open
2879 file descriptor. This option is used for an internal call by the
2880 smtp transport when there is a pending message waiting to go to an
2881 address to which it has got a connection. Five subsequent arguments are
2882 required: transport name, host name, IP address, sequence number, and
2883 message_id. Transports may decline to create new processes if the sequence
2884 number gets too big. The channel is stdin. This (-MC) must be the last
2885 argument. There's a subsequent check that the real-uid is privileged.
2887 If we are running in the test harness. delay for a bit, to let the process
2888 that set this one up complete. This makes for repeatability of the logging,
2891 if (Ustrcmp(argrest, "C") == 0)
2893 union sockaddr_46 interface_sock;
2894 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2897 exim_fail("exim: too many or too few arguments after -MC\n");
2899 if (msg_action_arg >= 0)
2900 exim_fail("exim: incompatible arguments\n");
2902 continue_transport = string_copy_taint(
2903 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2905 continue_hostname = string_copy_taint(
2906 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2908 continue_host_address = string_copy_taint(
2909 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2911 continue_sequence = Uatoi(argv[++i]);
2912 msg_action = MSG_DELIVER;
2913 msg_action_arg = ++i;
2914 forced_delivery = TRUE;
2915 queue_run_pid = passed_qr_pid;
2916 queue_run_pipe = passed_qr_pipe;
2918 if (!mac_ismsgid(argv[i]))
2919 exim_fail("exim: malformed message id %s after -MC option\n",
2922 /* Set up $sending_ip_address and $sending_port, unless proxied */
2924 if (!continue_proxy_cipher)
2925 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2927 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2930 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2933 testharness_pause_ms(500);
2937 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2941 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2942 precedes -MC (see above). The flag indicates that the host to which
2943 Exim is connected has accepted an AUTH sequence. */
2945 case 'A': f.smtp_authenticated = TRUE; break;
2947 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2948 that exim is connected to supports the esmtp extension DSN */
2950 case 'D': smtp_peer_options |= OPTION_DSN; break;
2952 /* -MCd: for debug, set a process-purpose string */
2954 case 'd': if (++i < argc)
2955 process_purpose = string_copy_taint(
2956 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2961 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2962 from the commandline should be tainted - but we will need an untainted
2963 value for the spoolfile when doing a -odi delivery process. */
2965 case 'G': if (++i < argc) queue_name = string_copy_taint(
2966 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2971 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2973 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2975 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2976 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2977 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2979 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2981 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2986 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2987 it preceded -MC (see above) */
2989 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2991 #ifdef SUPPORT_SOCKS
2992 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2993 case 'p': proxy_session = TRUE;
2996 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2999 proxy_local_port = Uatoi(argv[i]);
3002 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3005 proxy_external_port = Uatoi(argv[i]);
3011 /* -MCQ: pass on the pid of the queue-running process that started
3012 this chain of deliveries and the fd of its synchronizing pipe; this
3013 is useful only when it precedes -MC (see above) */
3015 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3017 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3021 /* -MCq: do a quota check on the given recipient for the given size
3022 of message. Separate from -MC. */
3023 case 'q': rcpt_verify_quota = TRUE;
3024 if (++i < argc) message_size = Uatoi(argv[i]);
3028 /* -MCS: set the smtp_use_size flag; this is useful only when it
3029 precedes -MC (see above) */
3031 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3034 /* -MCs: used with -MCt; SNI was sent */
3035 /* -MCr: ditto, DANE */
3038 case 's': if (++i < argc)
3040 continue_proxy_sni = string_copy_taint(
3041 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3043 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3048 /* -MCt: similar to -MCT below but the connection is still open
3049 via a proxy process which handles the TLS context and coding.
3050 Require three arguments for the proxied local address and port,
3051 and the TLS cipher. */
3053 case 't': if (++i < argc)
3054 sending_ip_address = string_copy_taint(
3055 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3059 sending_port = (int)(Uatol(argv[i]));
3062 continue_proxy_cipher = string_copy_taint(
3063 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3068 /* -MCT: set the tls_offered flag; this is useful only when it
3069 precedes -MC (see above). The flag indicates that the host to which
3070 Exim is connected has offered TLS support. */
3072 case 'T': smtp_peer_options |= OPTION_TLS; break;
3075 default: badarg = TRUE; break;
3080 /* -M[x]: various operations on the following list of message ids:
3081 -M deliver the messages, ignoring next retry times and thawing
3082 -Mc deliver the messages, checking next retry times, no thawing
3083 -Mf freeze the messages
3084 -Mg give up on the messages
3085 -Mt thaw the messages
3086 -Mrm remove the messages
3087 In the above cases, this must be the last option. There are also the
3088 following options which are followed by a single message id, and which
3089 act on that message. Some of them use the "recipient" addresses as well.
3090 -Mar add recipient(s)
3091 -MG move to a different queue
3092 -Mmad mark all recipients delivered
3093 -Mmd mark recipients(s) delivered
3095 -Mset load a message for use with -be
3097 -Mvc show copy (of whole message, in RFC 2822 format)
3104 msg_action = MSG_DELIVER;
3105 forced_delivery = f.deliver_force_thaw = TRUE;
3107 else if (Ustrcmp(argrest, "ar") == 0)
3109 msg_action = MSG_ADD_RECIPIENT;
3110 one_msg_action = TRUE;
3112 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3113 else if (Ustrcmp(argrest, "es") == 0)
3115 msg_action = MSG_EDIT_SENDER;
3116 one_msg_action = TRUE;
3118 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3119 else if (Ustrcmp(argrest, "g") == 0)
3121 msg_action = MSG_DELIVER;
3122 deliver_give_up = TRUE;
3124 else if (Ustrcmp(argrest, "G") == 0)
3126 msg_action = MSG_SETQUEUE;
3127 queue_name_dest = string_copy_taint(
3128 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3131 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3132 else if (Ustrcmp(argrest, "md") == 0)
3134 msg_action = MSG_MARK_DELIVERED;
3135 one_msg_action = TRUE;
3137 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3138 else if (Ustrcmp(argrest, "set") == 0)
3140 msg_action = MSG_LOAD;
3141 one_msg_action = TRUE;
3143 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3144 else if (Ustrcmp(argrest, "vb") == 0)
3146 msg_action = MSG_SHOW_BODY;
3147 one_msg_action = TRUE;
3149 else if (Ustrcmp(argrest, "vc") == 0)
3151 msg_action = MSG_SHOW_COPY;
3152 one_msg_action = TRUE;
3154 else if (Ustrcmp(argrest, "vh") == 0)
3156 msg_action = MSG_SHOW_HEADER;
3157 one_msg_action = TRUE;
3159 else if (Ustrcmp(argrest, "vl") == 0)
3161 msg_action = MSG_SHOW_LOG;
3162 one_msg_action = TRUE;
3164 else { badarg = TRUE; break; }
3166 /* All the -Mxx options require at least one message id. */
3168 msg_action_arg = i + 1;
3169 if (msg_action_arg >= argc)
3170 exim_fail("exim: no message ids given after %s option\n", arg);
3172 /* Some require only message ids to follow */
3174 if (!one_msg_action)
3176 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3177 exim_fail("exim: malformed message id %s after %s option\n",
3179 goto END_ARG; /* Remaining args are ids */
3182 /* Others require only one message id, possibly followed by addresses,
3183 which will be handled as normal arguments. */
3187 if (!mac_ismsgid(argv[msg_action_arg]))
3188 exim_fail("exim: malformed message id %s after %s option\n",
3189 argv[msg_action_arg], arg);
3195 /* Some programs seem to call the -om option without the leading o;
3196 for sendmail it askes for "me too". Exim always does this. */
3199 if (*argrest) badarg = TRUE;
3203 /* -N: don't do delivery - a debugging option that stops transports doing
3204 their thing. It implies debugging at the D_v level. */
3209 f.dont_deliver = TRUE;
3210 debug_selector |= D_v;
3211 debug_file = stderr;
3217 /* -n: This means "don't alias" in sendmail, apparently.
3218 For normal invocations, it has no effect.
3219 It may affect some other options. */
3225 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3226 option to the specified value. This form uses long names. We need to handle
3227 -O option=value and -Ooption=value. */
3232 exim_fail("exim: string expected after -O\n");
3238 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3241 if (!*(alias_arg = argrest))
3242 if (i+1 < argc) alias_arg = argv[++i];
3243 else exim_fail("exim: string expected after -oA\n");
3246 /* -oB: Set a connection message max value for remote deliveries */
3249 uschar * p = argrest;
3251 if (i+1 < argc && isdigit((argv[i+1][0])))
3255 connection_max_messages = 1;
3262 exim_fail("exim: number expected after -oB\n");
3263 connection_max_messages = Uatoi(p);
3268 /* -odb: background delivery */
3271 if (Ustrcmp(argrest, "b") == 0)
3273 f.synchronous_delivery = FALSE;
3274 arg_queue_only = FALSE;
3275 queue_only_set = TRUE;
3278 /* -odd: testsuite-only: add no inter-process delays */
3280 else if (Ustrcmp(argrest, "d") == 0)
3281 f.testsuite_delays = FALSE;
3283 /* -odf: foreground delivery (smail-compatible option); same effect as
3284 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3287 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3289 f.synchronous_delivery = TRUE;
3290 arg_queue_only = FALSE;
3291 queue_only_set = TRUE;
3294 /* -odq: queue only */
3296 else if (Ustrcmp(argrest, "q") == 0)
3298 f.synchronous_delivery = FALSE;
3299 arg_queue_only = TRUE;
3300 queue_only_set = TRUE;
3303 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3304 but no remote delivery */
3306 else if (Ustrcmp(argrest, "qs") == 0)
3308 f.queue_smtp = TRUE;
3309 arg_queue_only = FALSE;
3310 queue_only_set = TRUE;
3315 /* -oex: Sendmail error flags. As these are also accepted without the
3316 leading -o prefix, for compatibility with vacation and other callers,
3317 they are handled with -e above. */
3319 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3320 -oitrue: Another sendmail syntax for the same */
3323 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3328 /* -oM*: Set various characteristics for an incoming message; actually
3329 acted on for trusted callers only. */
3334 exim_fail("exim: data expected after -oM%s\n", argrest);
3336 /* -oMa: Set sender host address */
3338 if (Ustrcmp(argrest, "a") == 0)
3339 sender_host_address = string_copy_taint(
3340 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3343 /* -oMaa: Set authenticator name */
3345 else if (Ustrcmp(argrest, "aa") == 0)
3346 sender_host_authenticated = string_copy_taint(
3347 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3350 /* -oMas: setting authenticated sender */
3352 else if (Ustrcmp(argrest, "as") == 0)
3353 authenticated_sender = string_copy_taint(
3354 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3357 /* -oMai: setting authenticated id */
3359 else if (Ustrcmp(argrest, "ai") == 0)
3360 authenticated_id = string_copy_taint(
3361 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3364 /* -oMi: Set incoming interface address */
3366 else if (Ustrcmp(argrest, "i") == 0)
3367 interface_address = string_copy_taint(
3368 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3371 /* -oMm: Message reference */
3373 else if (Ustrcmp(argrest, "m") == 0)
3375 if (!mac_ismsgid(argv[i+1]))
3376 exim_fail("-oMm must be a valid message ID\n");
3377 if (!f.trusted_config)
3378 exim_fail("-oMm must be called by a trusted user/config\n");
3379 message_reference = argv[++i];
3382 /* -oMr: Received protocol */
3384 else if (Ustrcmp(argrest, "r") == 0)
3386 if (received_protocol)
3387 exim_fail("received_protocol is set already\n");
3389 received_protocol = string_copy_taint(
3390 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3393 /* -oMs: Set sender host name */
3395 else if (Ustrcmp(argrest, "s") == 0)
3396 sender_host_name = string_copy_taint(
3397 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3400 /* -oMt: Set sender ident */
3402 else if (Ustrcmp(argrest, "t") == 0)
3404 sender_ident_set = TRUE;
3405 sender_ident = string_copy_taint(
3406 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3410 /* Else a bad argument */
3417 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3418 seem to call this as -m (undocumented), so that is also accepted (see
3420 /* -oo: An ancient flag for old-style addresses which still seems to
3421 crop up in some calls (see in SCO). */
3425 if (*argrest) badarg = TRUE;
3428 /* -oP <name>: set pid file path for daemon
3429 -oPX: delete pid file of daemon */
3432 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3433 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3434 "(uid=%d euid=%d | %d)\n",
3435 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3436 if (!*argrest) override_pid_file_path = argv[++i];
3437 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3442 /* -or <n>: set timeout for non-SMTP acceptance
3443 -os <n>: set timeout for SMTP acceptance */
3448 int * tp = argrest[-1] == 'r'
3449 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3451 *tp = readconf_readtime(argrest, 0, FALSE);
3452 else if (i+1 < argc)
3453 *tp = readconf_readtime(argv[++i], 0, FALSE);
3456 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3460 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3461 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3464 if (*argrest) badarg = TRUE;
3465 else override_local_interfaces = string_copy_taint(
3466 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3470 /* -oY: Override creation of daemon notifier socket */
3473 if (*argrest) badarg = TRUE;
3474 else notifier_socket = NULL;
3477 /* Unknown -o argument */
3485 /* -ps: force Perl startup; -pd force delayed Perl startup */
3489 if (*argrest == 's' && argrest[1] == 0)
3491 perl_start_option = 1;
3494 if (*argrest == 'd' && argrest[1] == 0)
3496 perl_start_option = -1;
3501 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3502 which sets the host protocol and host name */
3505 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3509 uschar * hn = Ustrchr(argrest, ':');
3511 if (received_protocol)
3512 exim_fail("received_protocol is set already\n");
3515 received_protocol = string_copy_taint(
3516 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3520 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3521 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3522 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3529 receiving_message = FALSE;
3530 if (queue_interval >= 0)
3531 exim_fail("exim: -q specified more than once\n");
3533 /* -qq...: Do queue runs in a 2-stage manner */
3535 if (*argrest == 'q')
3537 f.queue_2stage = TRUE;
3541 /* -qi...: Do only first (initial) deliveries */
3543 if (*argrest == 'i')
3545 f.queue_run_first_delivery = TRUE;
3549 /* -qf...: Run the queue, forcing deliveries
3550 -qff..: Ditto, forcing thawing as well */
3552 if (*argrest == 'f')
3554 f.queue_run_force = TRUE;
3555 if (*++argrest == 'f')
3557 f.deliver_force_thaw = TRUE;
3562 /* -q[f][f]l...: Run the queue only on local deliveries */
3564 if (*argrest == 'l')
3566 f.queue_run_local = TRUE;
3570 /* -q[f][f][l][G<name>]... Work on the named queue */
3572 if (*argrest == 'G')
3575 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3576 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3577 queue_name = string_copyn(argrest, i);
3579 if (*argrest == '/') argrest++;
3582 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3583 only, optionally named, optionally starting from a given message id. */
3585 if (!(list_queue || count_queue))
3587 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3590 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3591 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3592 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3593 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3596 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3597 forced, optionally local only, optionally named. */
3599 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3601 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3605 case 'R': /* Synonymous with -qR... */
3607 const uschar *tainted_selectstr;
3609 receiving_message = FALSE;
3611 /* -Rf: As -R (below) but force all deliveries,
3612 -Rff: Ditto, but also thaw all frozen messages,
3613 -Rr: String is regex
3614 -Rrf: Regex and force
3615 -Rrff: Regex and force and thaw
3617 in all cases provided there are no further characters in this
3621 for (int i = 0; i < nelem(rsopts); i++)
3622 if (Ustrcmp(argrest, rsopts[i]) == 0)
3624 if (i != 2) f.queue_run_force = TRUE;
3625 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3626 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3627 argrest += Ustrlen(rsopts[i]);
3630 /* -R: Set string to match in addresses for forced queue run to
3631 pick out particular messages. */
3633 /* Avoid attacks from people providing very long strings, and do so before
3636 tainted_selectstr = argrest;
3637 else if (i+1 < argc)
3638 tainted_selectstr = argv[++i];
3640 exim_fail("exim: string expected after -R\n");
3641 deliver_selectstring = string_copy_taint(
3642 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3647 /* -r: an obsolete synonym for -f (see above) */
3650 /* -S: Like -R but works on sender. */
3652 case 'S': /* Synonymous with -qS... */
3654 const uschar *tainted_selectstr;
3656 receiving_message = FALSE;
3658 /* -Sf: As -S (below) but force all deliveries,
3659 -Sff: Ditto, but also thaw all frozen messages,
3660 -Sr: String is regex
3661 -Srf: Regex and force
3662 -Srff: Regex and force and thaw
3664 in all cases provided there are no further characters in this
3668 for (int i = 0; i < nelem(rsopts); i++)
3669 if (Ustrcmp(argrest, rsopts[i]) == 0)
3671 if (i != 2) f.queue_run_force = TRUE;
3672 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3673 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3674 argrest += Ustrlen(rsopts[i]);
3677 /* -S: Set string to match in addresses for forced queue run to
3678 pick out particular messages. */
3681 tainted_selectstr = argrest;
3682 else if (i+1 < argc)
3683 tainted_selectstr = argv[++i];
3685 exim_fail("exim: string expected after -S\n");
3686 deliver_selectstring_sender = string_copy_taint(
3687 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3692 /* -Tqt is an option that is exclusively for use by the testing suite.
3693 It is not recognized in other circumstances. It allows for the setting up
3694 of explicit "queue times" so that various warning/retry things can be
3695 tested. Otherwise variability of clock ticks etc. cause problems. */
3698 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3699 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3704 /* -t: Set flag to extract recipients from body of message. */
3707 if (!*argrest) extract_recipients = TRUE;
3709 /* -ti: Set flag to extract recipients from body of message, and also
3710 specify that dot does not end the message. */
3712 else if (Ustrcmp(argrest, "i") == 0)
3714 extract_recipients = TRUE;
3718 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3721 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3728 /* -U: This means "initial user submission" in sendmail, apparently. The
3729 doc claims that in future sendmail may refuse syntactically invalid
3730 messages instead of fixing them. For the moment, we just ignore it. */
3736 /* -v: verify things - this is a very low-level debugging */
3741 debug_selector |= D_v;
3742 debug_file = stderr;
3748 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3750 The -x flag tells the sendmail command that mail from a local
3751 mail program has National Language Support (NLS) extended characters
3752 in the body of the mail item. The sendmail command can send mail with
3753 extended NLS characters across networks that normally corrupts these
3756 As Exim is 8-bit clean, it just ignores this flag. */
3759 if (*argrest) badarg = TRUE;
3762 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3763 logs to that file. We swallow the parameter and otherwise ignore it. */
3768 exim_fail("exim: string expected after -X\n");
3771 /* -z: a line of text to log */
3776 log_oneline = string_copy_taint(
3777 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3780 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3783 /* All other initial characters are errors */
3788 } /* End of high-level switch statement */
3790 /* Failed to recognize the option, or syntax error */
3793 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3794 "option %s\n", arg);
3798 /* If -R or -S have been specified without -q, assume a single queue run. */
3800 if ( (deliver_selectstring || deliver_selectstring_sender)
3801 && queue_interval < 0)
3806 store_pool = old_pool;
3809 /* If usage_wanted is set we call the usage function - which never returns */
3810 if (usage_wanted) exim_usage(called_as);
3812 /* Arguments have been processed. Check for incompatibilities. */
3813 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3814 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3815 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3816 || filter_test != FTEST_NONE
3817 || msg_action_arg > 0 && !one_msg_action
3819 || ( msg_action_arg > 0
3820 && ( f.daemon_listen || queue_interval > 0 || list_options
3821 || checking && msg_action != MSG_LOAD
3822 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3824 || ( (f.daemon_listen || queue_interval > 0)
3825 && ( sender_address || list_options || list_queue || checking
3828 || f.daemon_listen && queue_interval == 0
3829 || f.inetd_wait_mode && queue_interval >= 0
3831 && ( checking || smtp_input || extract_recipients
3832 || filter_test != FTEST_NONE || bi_option
3834 || ( verify_address_mode
3835 && ( f.address_test_mode || smtp_input || extract_recipients
3836 || filter_test != FTEST_NONE || bi_option
3838 || ( f.address_test_mode
3839 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3843 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3845 || deliver_selectstring && queue_interval < 0
3846 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3848 exim_fail("exim: incompatible command-line options or arguments\n");
3850 /* If debugging is set up, set the file and the file descriptor to pass on to
3851 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3852 to run in the foreground. */
3854 if (debug_selector != 0)
3856 debug_file = stderr;
3857 debug_fd = fileno(debug_file);
3858 f.background_daemon = FALSE;
3859 testharness_pause_ms(100); /* lets caller finish */
3860 if (debug_selector != D_v) /* -v only doesn't show this */
3862 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3863 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3865 if (!version_printed)
3866 show_whats_supported(FALSE);
3870 /* When started with root privilege, ensure that the limits on the number of
3871 open files and the number of processes (where that is accessible) are
3872 sufficiently large, or are unset, in case Exim has been called from an
3873 environment where the limits are screwed down. Not all OS have the ability to
3874 change some of these limits. */
3878 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3884 #ifdef RLIMIT_NOFILE
3885 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3887 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3889 rlp.rlim_cur = rlp.rlim_max = 0;
3892 /* I originally chose 1000 as a nice big number that was unlikely to
3893 be exceeded. It turns out that some older OS have a fixed upper limit of
3896 if (rlp.rlim_cur < 1000)
3898 rlp.rlim_cur = rlp.rlim_max = 1000;
3899 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3901 rlp.rlim_cur = rlp.rlim_max = 256;
3902 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3903 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3910 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3912 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3914 rlp.rlim_cur = rlp.rlim_max = 0;
3917 # ifdef RLIM_INFINITY
3918 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3920 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3922 if (rlp.rlim_cur < 1000)
3924 rlp.rlim_cur = rlp.rlim_max = 1000;
3926 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3927 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3933 /* Exim is normally entered as root (but some special configurations are
3934 possible that don't do this). However, it always spins off sub-processes that
3935 set their uid and gid as required for local delivery. We don't want to pass on
3936 any extra groups that root may belong to, so we want to get rid of them all at
3939 We need to obey setgroups() at this stage, before possibly giving up root
3940 privilege for a changed configuration file, but later on we might need to
3941 check on the additional groups for the admin user privilege - can't do that
3942 till after reading the config, which might specify the exim gid. Therefore,
3943 save the group list here first. */
3945 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3946 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3948 /* There is a fundamental difference in some BSD systems in the matter of
3949 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3950 known not to be different. On the "different" systems there is a single group
3951 list, and the first entry in it is the current group. On all other versions of
3952 Unix there is a supplementary group list, which is in *addition* to the current
3953 group. Consequently, to get rid of all extraneous groups on a "standard" system
3954 you pass over 0 groups to setgroups(), while on a "different" system you pass
3955 over a single group - the current group, which is always the first group in the
3956 list. Calling setgroups() with zero groups on a "different" system results in
3957 an error return. The following code should cope with both types of system.
3959 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3960 the "setgroups() with zero groups" - and changes the egid.
3961 Thanks to that we had to stash the original_egid above, for use below
3962 in the call to exim_setugid().
3964 However, if this process isn't running as root, setgroups() can't be used
3965 since you have to be root to run it, even if throwing away groups.
3966 Except, sigh, for Hurd - where you can.
3967 Not being root here happens only in some unusual configurations. */
3970 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3971 && setgroups(0, NULL) != 0
3973 && setgroups(1, group_list) != 0)
3974 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3976 /* If the configuration file name has been altered by an argument on the
3977 command line (either a new file name or a macro definition) and the caller is
3978 not root, or if this is a filter testing run, remove any setuid privilege the
3979 program has and run as the underlying user.
3981 The exim user is locked out of this, which severely restricts the use of -C
3984 Otherwise, set the real ids to the effective values (should be root unless run
3985 from inetd, which it can either be root or the exim uid, if one is configured).
3987 There is a private mechanism for bypassing some of this, in order to make it
3988 possible to test lots of configurations automatically, without having either to
3989 recompile each time, or to patch in an actual configuration file name and other
3990 values (such as the path name). If running in the test harness, pretend that
3991 configuration file changes and macro definitions haven't happened. */
3994 (!f.trusted_config || /* Config changed, or */
3995 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3996 real_uid != root_uid && /* Not root, and */
3997 !f.running_in_test_harness /* Not fudged */
3999 expansion_test /* expansion testing */
4001 filter_test != FTEST_NONE) /* Filter testing */
4003 setgroups(group_count, group_list);
4004 exim_setugid(real_uid, real_gid, FALSE,
4005 US"-C, -D, -be or -bf forces real uid");
4006 removed_privilege = TRUE;
4008 /* In the normal case when Exim is called like this, stderr is available
4009 and should be used for any logging information because attempts to write
4010 to the log will usually fail. To arrange this, we unset really_exim. However,
4011 if no stderr is available there is no point - we might as well have a go
4012 at the log (if it fails, syslog will be written).
4014 Note that if the invoker is Exim, the logs remain available. Messing with
4015 this causes unlogged successful deliveries. */
4017 if (log_stderr && real_uid != exim_uid)
4018 f.really_exim = FALSE;
4021 /* Privilege is to be retained for the moment. It may be dropped later,
4022 depending on the job that this Exim process has been asked to do. For now, set
4023 the real uid to the effective so that subsequent re-execs of Exim are done by a
4027 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4029 /* If testing a filter, open the file(s) now, before wasting time doing other
4030 setups and reading the message. */
4032 if (filter_test & FTEST_SYSTEM)
4033 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4034 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4037 if (filter_test & FTEST_USER)
4038 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4039 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4042 /* Initialise lookup_list
4043 If debugging, already called above via version reporting.
4044 In either case, we initialise the list of available lookups while running
4045 as root. All dynamically modules are loaded from a directory which is
4046 hard-coded into the binary and is code which, if not a module, would be
4047 part of Exim already. Ability to modify the content of the directory
4048 is equivalent to the ability to modify a setuid binary!
4050 This needs to happen before we read the main configuration. */
4053 /*XXX this excrescence could move to the testsuite standard config setup file */
4055 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4058 /* Read the main runtime configuration data; this gives up if there
4059 is a failure. It leaves the configuration file open so that the subsequent
4060 configuration data for delivery can be read if needed.
4062 NOTE: immediately after opening the configuration file we change the working
4063 directory to "/"! Later we change to $spool_directory. We do it there, because
4064 during readconf_main() some expansion takes place already. */
4066 /* Store the initial cwd before we change directories. Can be NULL if the
4067 dir has already been unlinked. */
4068 initial_cwd = os_getcwd(NULL, 0);
4069 if (!initial_cwd && errno)
4070 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4072 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4073 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4076 -be[m] expansion test -
4077 -b[fF] filter test new
4079 -bmalware malware_test_file new
4081 -brw rewrite test new
4083 -bv[s] address verify -
4085 -bP <option> (except -bP config, which sets list_config)
4087 If any of these options is set, we suppress warnings about configuration
4088 issues (currently about tls_advertise_hosts and keep_environment not being
4092 int old_pool = store_pool;
4093 #ifdef MEASURE_TIMING
4094 struct timeval t0, diff;
4095 (void)gettimeofday(&t0, NULL);
4098 store_pool = POOL_CONFIG;
4099 readconf_main(checking || list_options);
4100 store_pool = old_pool;
4102 #ifdef MEASURE_TIMING
4103 report_time_since(&t0, US"readconf_main (delta)");
4107 /* Now in directory "/" */
4109 if (cleanup_environment() == FALSE)
4110 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4113 /* If an action on specific messages is requested, or if a daemon or queue
4114 runner is being started, we need to know if Exim was called by an admin user.
4115 This is the case if the real user is root or exim, or if the real group is
4116 exim, or if one of the supplementary groups is exim or a group listed in
4117 admin_groups. We don't fail all message actions immediately if not admin_user,
4118 since some actions can be performed by non-admin users. Instead, set admin_user
4119 for later interrogation. */
4121 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4122 f.admin_user = TRUE;
4124 for (int i = 0; i < group_count && !f.admin_user; i++)
4125 if (group_list[i] == exim_gid)
4126 f.admin_user = TRUE;
4127 else if (admin_groups)
4128 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4129 if (admin_groups[j] == group_list[i])
4130 f.admin_user = TRUE;
4132 /* Another group of privileged users are the trusted users. These are root,
4133 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4134 are permitted to specify sender_addresses with -f on the command line, and
4135 other message parameters as well. */
4137 if (real_uid == root_uid || real_uid == exim_uid)
4138 f.trusted_caller = TRUE;
4142 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4143 if (trusted_users[i] == real_uid)
4144 f.trusted_caller = TRUE;
4147 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4148 if (trusted_groups[i] == real_gid)
4149 f.trusted_caller = TRUE;
4150 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4151 if (trusted_groups[i] == group_list[j])
4152 f.trusted_caller = TRUE;
4155 /* At this point, we know if the user is privileged and some command-line
4156 options become possibly impermissible, depending upon the configuration file. */
4158 if (checking && commandline_checks_require_admin && !f.admin_user)
4159 exim_fail("exim: those command-line flags are set to require admin\n");
4161 /* Handle the decoding of logging options. */
4163 decode_bits(log_selector, log_selector_size, log_notall,
4164 log_selector_string, log_options, log_options_count, US"log", 0);
4168 debug_printf("configuration file is %s\n", config_main_filename);
4169 debug_printf("log selectors =");
4170 for (int i = 0; i < log_selector_size; i++)
4171 debug_printf(" %08x", log_selector[i]);
4175 /* If domain literals are not allowed, check the sender address that was
4176 supplied with -f. Ditto for a stripped trailing dot. */
4180 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4181 exim_fail("exim: bad -f address \"%s\": domain literals not "
4182 "allowed\n", sender_address);
4183 if (f_end_dot && !strip_trailing_dot)
4184 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4185 "(trailing dot not allowed)\n", sender_address);
4188 /* See if an admin user overrode our logging. */
4190 if (cmdline_syslog_name)
4193 syslog_processname = cmdline_syslog_name;
4194 log_file_path = string_copy(CUS"syslog");
4197 /* not a panic, non-privileged users should not be able to spam paniclog */
4199 "exim: you lack sufficient privilege to specify syslog process name\n");
4201 /* Paranoia check of maximum lengths of certain strings. There is a check
4202 on the length of the log file path in log.c, which will come into effect
4203 if there are any calls to write the log earlier than this. However, if we
4204 get this far but the string is very long, it is better to stop now than to
4205 carry on and (e.g.) receive a message and then have to collapse. The call to
4206 log_write() from here will cause the ultimate panic collapse if the complete
4207 file name exceeds the buffer length. */
4209 if (Ustrlen(log_file_path) > 200)
4210 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4211 "log_file_path is longer than 200 chars: aborting");
4213 if (Ustrlen(pid_file_path) > 200)
4214 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4215 "pid_file_path is longer than 200 chars: aborting");
4217 if (Ustrlen(spool_directory) > 200)
4218 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4219 "spool_directory is longer than 200 chars: aborting");
4221 /* Length check on the process name given to syslog for its TAG field,
4222 which is only permitted to be 32 characters or less. See RFC 3164. */
4224 if (Ustrlen(syslog_processname) > 32)
4225 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4226 "syslog_processname is longer than 32 chars: aborting");
4231 log_write(0, LOG_MAIN, "%s", log_oneline);
4232 return EXIT_SUCCESS;
4235 return EXIT_FAILURE;
4237 /* In some operating systems, the environment variable TMPDIR controls where
4238 temporary files are created; Exim doesn't use these (apart from when delivering
4239 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4240 If TMPDIR is found in the environment, reset it to the value defined in the
4241 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4242 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4243 EXIM_TMPDIR by the build scripts.
4247 if (environ) for (uschar ** p = USS environ; *p; p++)
4248 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4250 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4251 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4253 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4257 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4258 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4259 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4260 called by a user who has set the TZ variable. This then affects the timestamps
4261 in log files and in Received: headers, and any created Date: header lines. The
4262 required timezone is settable in the configuration file, so nothing can be done
4263 about this earlier - but hopefully nothing will normally be logged earlier than
4264 this. We have to make a new environment if TZ is wrong, but don't bother if
4265 timestamps_utc is set, because then all times are in UTC anyway. */
4267 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4268 f.timestamps_utc = TRUE;
4271 uschar *envtz = US getenv("TZ");
4273 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4274 : timezone_string != NULL
4277 uschar **p = USS environ;
4281 if (environ) while (*p++) count++;
4282 if (!envtz) count++;
4283 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4284 if (environ) for (p = USS environ; *p; p++)
4285 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4286 if (timezone_string)
4288 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4289 sprintf(CS *newp++, "TZ=%s", timezone_string);
4294 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4295 tod_stamp(tod_log));
4299 /* Handle the case when we have removed the setuid privilege because of -C or
4300 -D. This means that the caller of Exim was not root.
4302 There is a problem if we were running as the Exim user. The sysadmin may
4303 expect this case to retain privilege because "the binary was called by the
4304 Exim user", but it hasn't, because either the -D option set macros, or the
4305 -C option set a non-trusted configuration file. There are two possibilities:
4307 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4308 to do message deliveries. Thus, the fact that it is running as a
4309 non-privileged user is plausible, and might be wanted in some special
4310 configurations. However, really_exim will have been set false when
4311 privilege was dropped, to stop Exim trying to write to its normal log
4312 files. Therefore, re-enable normal log processing, assuming the sysadmin
4313 has set up the log directory correctly.
4315 (2) If deliver_drop_privilege is not set, the configuration won't work as
4316 apparently intended, and so we log a panic message. In order to retain
4317 root for -C or -D, the caller must either be root or be invoking a
4318 trusted configuration file (when deliver_drop_privilege is false). */
4320 if ( removed_privilege
4321 && (!f.trusted_config || opt_D_used)
4322 && real_uid == exim_uid)
4323 if (deliver_drop_privilege)
4324 f.really_exim = TRUE; /* let logging work normally */
4326 log_write(0, LOG_MAIN|LOG_PANIC,
4327 "exim user lost privilege for using %s option",
4328 f.trusted_config? "-D" : "-C");
4330 /* Start up Perl interpreter if Perl support is configured and there is a
4331 perl_startup option, and the configuration or the command line specifies
4332 initializing starting. Note that the global variables are actually called
4333 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4336 if (perl_start_option != 0)
4337 opt_perl_at_start = (perl_start_option > 0);
4338 if (opt_perl_at_start && opt_perl_startup != NULL)
4341 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4342 if ((errstr = init_perl(opt_perl_startup)))
4343 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4344 opt_perl_started = TRUE;
4346 #endif /* EXIM_PERL */
4348 /* Log the arguments of the call if the configuration file said so. This is
4349 a debugging feature for finding out what arguments certain MUAs actually use.
4350 Don't attempt it if logging is disabled, or if listing variables or if
4351 verifying/testing addresses or expansions. */
4353 if ( (debug_selector & D_any || LOGGING(arguments))
4354 && f.really_exim && !list_options && !checking)
4356 uschar *p = big_buffer;
4357 Ustrcpy(p, US"cwd= (failed)");
4364 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4365 p += Ustrlen(CCS p);
4368 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4370 for (int i = 0; i < argc; i++)
4372 int len = Ustrlen(argv[i]);
4373 const uschar *printing;
4375 if (p + len + 8 >= big_buffer + big_buffer_size)
4377 Ustrcpy(p, US" ...");
4378 log_write(0, LOG_MAIN, "%s", big_buffer);
4379 Ustrcpy(big_buffer, US"...");
4382 printing = string_printing(argv[i]);
4383 if (!*printing) quote = US"\"";
4386 const uschar *pp = printing;
4388 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4390 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4391 (p - big_buffer) - 4), printing, quote);
4394 if (LOGGING(arguments))
4395 log_write(0, LOG_MAIN, "%s", big_buffer);
4397 debug_printf("%s\n", big_buffer);
4400 /* Set the working directory to be the top-level spool directory. We don't rely
4401 on this in the code, which always uses fully qualified names, but it's useful
4402 for core dumps etc. Don't complain if it fails - the spool directory might not
4403 be generally accessible and calls with the -C option (and others) have lost
4404 privilege by now. Before the chdir, we try to ensure that the directory exists.
4407 if (Uchdir(spool_directory) != 0)
4409 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4410 (void) Uchdir(spool_directory);
4413 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4414 alias file. Exim doesn't have such a concept, but this call is screwed into
4415 Sun's YP makefiles. Handle this by calling a configured script, as the real
4416 user who called Exim. The -oA option can be used to pass an argument to the
4421 (void) fclose(config_file);
4422 if (bi_command && *bi_command)
4426 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4427 if (alias_arg) argv[i++] = alias_arg;
4430 setgroups(group_count, group_list);
4431 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4433 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4434 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4436 execv(CS argv[0], (char *const *)argv);
4437 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4441 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4446 /* We moved the admin/trusted check to be immediately after reading the
4447 configuration file. We leave these prints here to ensure that syslog setup,
4448 logfile setup, and so on has already happened. */
4450 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4451 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4453 /* Only an admin user may start the daemon or force a queue run in the default
4454 configuration, but the queue run restriction can be relaxed. Only an admin
4455 user may request that a message be returned to its sender forthwith. Only an
4456 admin user may specify a debug level greater than D_v (because it might show
4457 passwords, etc. in lookup queries). Only an admin user may request a queue
4458 count. Only an admin user can use the test interface to scan for email
4459 (because Exim will be in the spool dir and able to look at mails). */
4463 BOOL debugset = (debug_selector & ~D_v) != 0;
4464 if ( deliver_give_up || f.daemon_listen || malware_test_file
4465 || count_queue && queue_list_requires_admin
4466 || list_queue && queue_list_requires_admin
4467 || queue_interval >= 0 && prod_requires_admin
4468 || queue_name_dest && prod_requires_admin
4469 || debugset && !f.running_in_test_harness
4471 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4474 /* If the real user is not root or the exim uid, the argument for passing
4475 in an open TCP/IP connection for another message is not permitted, nor is
4476 running with the -N option for any delivery action, unless this call to exim is
4477 one that supplied an input message, or we are using a patched exim for
4478 regression testing. */
4480 if ( real_uid != root_uid && real_uid != exim_uid
4481 && ( continue_hostname
4483 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4485 && !f.running_in_test_harness
4487 exim_fail("exim: Permission denied\n");
4489 /* If the caller is not trusted, certain arguments are ignored when running for
4490 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4491 Note that authority for performing certain actions on messages is tested in the
4492 queue_action() function. */
4494 if (!f.trusted_caller && !checking)
4496 sender_host_name = sender_host_address = interface_address =
4497 sender_ident = received_protocol = NULL;
4498 sender_host_port = interface_port = 0;
4499 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4502 /* If a sender host address is set, extract the optional port number off the
4503 end of it and check its syntax. Do the same thing for the interface address.
4504 Exim exits if the syntax is bad. */
4508 if (sender_host_address)
4509 sender_host_port = check_port(sender_host_address);
4510 if (interface_address)
4511 interface_port = check_port(interface_address);
4514 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4517 if (f.trusted_caller)
4519 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4520 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4523 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4526 /* If an SMTP message is being received check to see if the standard input is a
4527 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4528 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4533 union sockaddr_46 inetd_sock;
4534 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4535 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4537 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4538 if (family == AF_INET || family == AF_INET6)
4540 union sockaddr_46 interface_sock;
4541 size = sizeof(interface_sock);
4543 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4544 interface_address = host_ntoa(-1, &interface_sock, NULL,
4547 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4549 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4552 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4553 NULL, &sender_host_port);
4554 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4555 "inetd is not supported when mua_wrapper is set");
4559 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4564 /* If the load average is going to be needed while receiving a message, get it
4565 now for those OS that require the first call to os_getloadavg() to be done as
4566 root. There will be further calls later for each message received. */
4568 #ifdef LOAD_AVG_NEEDS_ROOT
4569 if ( receiving_message
4570 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4571 load_average = OS_GETLOADAVG();
4574 /* The queue_only configuration option can be overridden by -odx on the command
4575 line, except that if queue_only_override is false, queue_only cannot be unset
4576 from the command line. */
4578 if (queue_only_set && (queue_only_override || arg_queue_only))
4579 queue_only = arg_queue_only;
4581 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4584 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4585 if (arg_smtp_receive_timeout >= 0)
4586 smtp_receive_timeout = arg_smtp_receive_timeout;
4588 /* If Exim was started with root privilege, unless we have already removed the
4589 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4590 except when starting the daemon or doing some kind of delivery or address
4591 testing (-bt). These are the only cases when root need to be retained. We run
4592 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4593 retained only for starting the daemon. We always do the initgroups() in this
4594 situation (controlled by the TRUE below), in order to be as close as possible
4595 to the state Exim usually runs in. */
4597 if ( !unprivileged /* originally had root AND */
4598 && !removed_privilege /* still got root AND */
4599 && !f.daemon_listen /* not starting the daemon */
4600 && queue_interval <= 0 /* (either kind of daemon) */
4601 && ( /* AND EITHER */
4602 deliver_drop_privilege /* requested unprivileged */
4604 queue_interval < 0 /* not running the queue */
4605 && ( msg_action_arg < 0 /* and */
4606 || msg_action != MSG_DELIVER /* not delivering */
4608 && (!checking || !f.address_test_mode) /* not address checking */
4609 && !rcpt_verify_quota /* and not quota checking */
4611 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4613 /* When we are retaining a privileged uid, we still change to the exim gid. */
4618 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4619 rv = setgid(exim_gid);
4620 /* Impact of failure is that some stuff might end up with an incorrect group.
4621 We track this for failures from root, since any attempt to change privilege
4622 by root should succeed and failures should be examined. For non-root,
4623 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4624 no need to complain then. */
4626 if (!(unprivileged || removed_privilege))
4627 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4630 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4631 (long int)exim_gid, strerror(errno));
4635 /* Handle a request to scan a file for malware */
4636 if (malware_test_file)
4638 #ifdef WITH_CONTENT_SCAN
4640 set_process_info("scanning file for malware");
4641 if ((result = malware_in_file(malware_test_file)) == FAIL)
4643 printf("No malware found.\n");
4648 printf("Malware lookup returned non-okay/fail: %d\n", result);
4652 printf("Malware found: %s\n", malware_name);
4654 printf("Malware scan detected malware of unknown name.\n");
4656 printf("Malware scanning not enabled at compile time.\n");
4661 /* Handle a request to list the delivery queue */
4665 set_process_info("listing the queue");
4666 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4670 /* Handle a request to count the delivery queue */
4674 set_process_info("counting the queue");
4675 fprintf(stdout, "%u\n", queue_count());
4679 /* Handle actions on specific messages, except for the force delivery and
4680 message load actions, which are done below. Some actions take a whole list of
4681 message ids, which are known to continue up to the end of the arguments. Others
4682 take a single message id and then operate on the recipients list. */
4684 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4686 int yield = EXIT_SUCCESS;
4687 set_process_info("acting on specified messages");
4689 /* ACL definitions may be needed when removing a message (-Mrm) because
4690 event_action gets expanded */
4692 if (msg_action == MSG_REMOVE)
4694 int old_pool = store_pool;
4695 store_pool = POOL_CONFIG;
4697 store_pool = old_pool;
4698 store_writeprotect(POOL_CONFIG);
4701 if (!one_msg_action)
4703 for (i = msg_action_arg; i < argc; i++)
4704 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4705 yield = EXIT_FAILURE;
4708 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4709 default: printf("\n"); break;
4713 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4714 recipients_arg)) yield = EXIT_FAILURE;
4718 /* We used to set up here to skip reading the ACL section, on
4719 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4720 Now, since the intro of the ${acl } expansion, ACL definitions may be
4721 needed in transports so we lost the optimisation. */
4724 int old_pool = store_pool;
4725 #ifdef MEASURE_TIMING
4726 struct timeval t0, diff;
4727 (void)gettimeofday(&t0, NULL);
4730 store_pool = POOL_CONFIG;
4732 store_pool = old_pool;
4734 /* -be can add macro definitions, needing to link to the macro structure
4735 chain. Otherwise, make the memory used for config data readonly. */
4737 if (!expansion_test)
4738 store_writeprotect(POOL_CONFIG);
4740 #ifdef MEASURE_TIMING
4741 report_time_since(&t0, US"readconf_rest (delta)");
4745 /* Handle a request to check quota */
4746 if (rcpt_verify_quota)
4747 if (real_uid != root_uid && real_uid != exim_uid)
4748 exim_fail("exim: Permission denied\n");
4749 else if (recipients_arg >= argc)
4750 exim_fail("exim: missing recipient for quota check\n");
4753 verify_quota(argv[recipients_arg]);
4754 exim_exit(EXIT_SUCCESS);
4757 /* Handle the -brt option. This is for checking out retry configurations.
4758 The next three arguments are a domain name or a complete address, and
4759 optionally two error numbers. All it does is to call the function that
4760 scans the retry configuration data. */
4762 if (test_retry_arg >= 0)
4764 retry_config *yield;
4765 int basic_errno = 0;
4767 const uschar *s1, *s2;
4769 if (test_retry_arg >= argc)
4771 printf("-brt needs a domain or address argument\n");
4772 exim_exit(EXIT_FAILURE);
4774 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4777 /* If the first argument contains no @ and no . it might be a local user
4778 or it might be a single-component name. Treat as a domain. */
4780 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4782 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4783 "being \ntreated as a one-component domain, not as a local part.\n\n",
4787 /* There may be an optional second domain arg. */
4789 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4790 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4792 /* The final arg is an error name */
4794 if (test_retry_arg < argc)
4796 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4798 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4801 printf("%s\n", CS error);
4802 return EXIT_FAILURE;
4805 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4806 code > 100 as an error is for matching codes to the decade. Turn them into
4807 a real error code, off the decade. */
4809 if (basic_errno == ERRNO_MAIL4XX ||
4810 basic_errno == ERRNO_RCPT4XX ||
4811 basic_errno == ERRNO_DATA4XX)
4813 int code = (more_errno >> 8) & 255;
4815 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4816 else if (code > 100)
4817 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4821 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4822 printf("No retry information found\n");
4825 more_errno = yield->more_errno;
4826 printf("Retry rule: %s ", yield->pattern);
4828 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4830 printf("quota%s%s ",
4831 (more_errno > 0)? "_" : "",
4832 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4834 else if (yield->basic_errno == ECONNREFUSED)
4836 printf("refused%s%s ",
4837 (more_errno > 0)? "_" : "",
4838 (more_errno == 'M')? "MX" :
4839 (more_errno == 'A')? "A" : "");
4841 else if (yield->basic_errno == ETIMEDOUT)
4844 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4846 if (more_errno != 0) printf("_%s",
4847 (more_errno == 'M')? "MX" : "A");
4850 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4851 printf("auth_failed ");
4854 for (retry_rule * r = yield->rules; r; r = r->next)
4856 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4857 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4863 printf(",%d.", x/1000);
4877 exim_exit(EXIT_SUCCESS);
4880 /* Handle a request to list one or more configuration options */
4881 /* If -n was set, we suppress some information */
4886 set_process_info("listing variables");
4887 if (recipients_arg >= argc)
4888 fail = !readconf_print(US"all", NULL, flag_n);
4889 else for (i = recipients_arg; i < argc; i++)
4892 (Ustrcmp(argv[i], "router") == 0 ||
4893 Ustrcmp(argv[i], "transport") == 0 ||
4894 Ustrcmp(argv[i], "authenticator") == 0 ||
4895 Ustrcmp(argv[i], "macro") == 0 ||
4896 Ustrcmp(argv[i], "environment") == 0))
4898 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4902 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4904 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4909 set_process_info("listing config");
4910 exim_exit(readconf_print(US"config", NULL, flag_n)
4911 ? EXIT_SUCCESS : EXIT_FAILURE);
4915 /* Initialise subsystems as required. */
4919 /* Handle a request to deliver one or more messages that are already on the
4920 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4921 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4923 Delivery of specific messages is typically used for a small number when
4924 prodding by hand (when the option forced_delivery will be set) or when
4925 re-execing to regain root privilege. Each message delivery must happen in a
4926 separate process, so we fork a process for each one, and run them sequentially
4927 so that debugging output doesn't get intertwined, and to avoid spawning too
4928 many processes if a long list is given. However, don't fork for the last one;
4929 this saves a process in the common case when Exim is called to deliver just one
4932 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4934 if (prod_requires_admin && !f.admin_user)
4936 fprintf(stderr, "exim: Permission denied\n");
4937 exim_exit(EXIT_FAILURE);
4939 set_process_info("delivering specified messages");
4940 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4941 for (i = msg_action_arg; i < argc; i++)
4945 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4946 that runs into a later copy into the untainted global message_id[] */
4947 /*XXX Do we need a length limit check here? */
4949 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4950 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4952 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4953 exim_underbar_exit(EXIT_SUCCESS);
4957 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4959 exim_exit(EXIT_FAILURE);
4963 exim_exit(EXIT_SUCCESS);
4967 /* If only a single queue run is requested, without SMTP listening, we can just
4968 turn into a queue runner, with an optional starting message id. */
4970 if (queue_interval == 0 && !f.daemon_listen)
4972 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4973 start_queue_run_id ? US" starting at " : US"",
4974 start_queue_run_id ? start_queue_run_id: US"",
4975 stop_queue_run_id ? US" stopping at " : US"",
4976 stop_queue_run_id ? stop_queue_run_id : US"");
4978 set_process_info("running the '%s' queue (single queue run)", queue_name);
4980 set_process_info("running the queue (single queue run)");
4981 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4982 exim_exit(EXIT_SUCCESS);
4986 /* Find the login name of the real user running this process. This is always
4987 needed when receiving a message, because it is written into the spool file. It
4988 may also be used to construct a from: or a sender: header, and in this case we
4989 need the user's full name as well, so save a copy of it, checked for RFC822
4990 syntax and munged if necessary, if it hasn't previously been set by the -F
4991 argument. We may try to get the passwd entry more than once, in case NIS or
4992 other delays are in evidence. Save the home directory for use in filter testing
4997 if ((pw = getpwuid(real_uid)) != NULL)
4999 originator_login = string_copy(US pw->pw_name);
5000 originator_home = string_copy(US pw->pw_dir);
5002 /* If user name has not been set by -F, set it from the passwd entry
5003 unless -f has been used to set the sender address by a trusted user. */
5005 if (!originator_name)
5007 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5009 uschar *name = US pw->pw_gecos;
5010 uschar *amp = Ustrchr(name, '&');
5013 /* Most Unix specify that a '&' character in the gecos field is
5014 replaced by a copy of the login name, and some even specify that
5015 the first character should be upper cased, so that's what we do. */
5020 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5021 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5022 buffer[loffset] = toupper(buffer[loffset]);
5026 /* If a pattern for matching the gecos field was supplied, apply
5027 it and then expand the name string. */
5029 if (gecos_pattern && gecos_name)
5031 const pcre2_code *re;
5032 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
5034 if (regex_match_and_setup(re, name, 0, -1))
5036 uschar *new_name = expand_string(gecos_name);
5040 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5041 "gecos field \"%s\"\n", new_name, name);
5044 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5045 "\"%s\": %s\n", gecos_name, expand_string_message);
5047 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5048 "gecos field \"%s\"\n", gecos_pattern, name);
5049 store_free((void *)re);
5051 originator_name = string_copy(name);
5054 /* A trusted caller has used -f but not -F */
5056 else originator_name = US"";
5059 /* Break the retry loop */
5064 if (++i > finduser_retries) break;
5068 /* If we cannot get a user login, log the incident and give up, unless the
5069 configuration specifies something to use. When running in the test harness,
5070 any setting of unknown_login overrides the actual name. */
5072 if (!originator_login || f.running_in_test_harness)
5076 originator_login = expand_string(unknown_login);
5077 if (!originator_name && unknown_username)
5078 originator_name = expand_string(unknown_username);
5079 if (!originator_name) originator_name = US"";
5081 if (!originator_login)
5082 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5086 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5089 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5091 /* If a message is created by this call of Exim, the uid/gid of its originator
5092 are those of the caller. These values are overridden if an existing message is
5093 read in from the spool. */
5095 originator_uid = real_uid;
5096 originator_gid = real_gid;
5098 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5099 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5101 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5102 returns. We leave this till here so that the originator_ fields are available
5103 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5106 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5110 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5111 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5112 "mua_wrapper is set");
5115 # ifndef DISABLE_TLS
5116 /* This also checks that the library linkage is working and we can call
5117 routines in it, so call even if tls_require_ciphers is unset */
5119 # ifdef MEASURE_TIMING
5120 struct timeval t0, diff;
5121 (void)gettimeofday(&t0, NULL);
5123 if (!tls_dropprivs_validate_require_cipher(FALSE))
5125 # ifdef MEASURE_TIMING
5126 report_time_since(&t0, US"validate_ciphers (delta)");
5134 /* If the sender ident has not been set (by a trusted caller) set it to
5135 the caller. This will get overwritten below for an inetd call. If a trusted
5136 caller has set it empty, unset it. */
5138 if (!sender_ident) sender_ident = originator_login;
5139 else if (!*sender_ident) sender_ident = NULL;
5141 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5142 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5143 originator_* variables set. */
5145 if (test_rewrite_arg >= 0)
5147 f.really_exim = FALSE;
5148 if (test_rewrite_arg >= argc)
5150 printf("-brw needs an address argument\n");
5151 exim_exit(EXIT_FAILURE);
5153 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5154 exim_exit(EXIT_SUCCESS);
5157 /* A locally-supplied message is considered to be coming from a local user
5158 unless a trusted caller supplies a sender address with -f, or is passing in the
5159 message via SMTP (inetd invocation or otherwise). */
5161 if ( !sender_address && !smtp_input
5162 || !f.trusted_caller && filter_test == FTEST_NONE)
5164 f.sender_local = TRUE;
5166 /* A trusted caller can supply authenticated_sender and authenticated_id
5167 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5168 defaults except when host checking. */
5170 if (!authenticated_sender && !host_checking)
5171 authenticated_sender = string_sprintf("%s@%s", originator_login,
5172 qualify_domain_sender);
5173 if (!authenticated_id && !host_checking)
5174 authenticated_id = originator_login;
5177 /* Trusted callers are always permitted to specify the sender address.
5178 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5179 is specified is the empty address. However, if a trusted caller does not
5180 specify a sender address for SMTP input, we leave sender_address unset. This
5181 causes the MAIL commands to be honoured. */
5183 if ( !smtp_input && !sender_address
5184 || !receive_check_set_sender(sender_address))
5186 /* Either the caller is not permitted to set a general sender, or this is
5187 non-SMTP input and the trusted caller has not set a sender. If there is no
5188 sender, or if a sender other than <> is set, override with the originator's
5189 login (which will get qualified below), except when checking things. */
5191 if ( !sender_address /* No sender_address set */
5193 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5194 !checking)) /* Not running tests, including filter tests */
5196 sender_address = originator_login;
5197 f.sender_address_forced = FALSE;
5198 sender_address_domain = 0;
5202 /* Remember whether an untrusted caller set the sender address */
5204 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5206 /* Ensure that the sender address is fully qualified unless it is the empty
5207 address, which indicates an error message, or doesn't exist (root caller, smtp
5208 interface, no -f argument). */
5210 if (sender_address && *sender_address && sender_address_domain == 0)
5211 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5212 qualify_domain_sender);
5214 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5216 /* Handle a request to verify a list of addresses, or test them for delivery.
5217 This must follow the setting of the sender address, since routers can be
5218 predicated upon the sender. If no arguments are given, read addresses from
5219 stdin. Set debug_level to at least D_v to get full output for address testing.
5222 if (verify_address_mode || f.address_test_mode)
5225 int flags = vopt_qualify;
5227 if (verify_address_mode)
5229 if (!verify_as_sender) flags |= vopt_is_recipient;
5230 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5235 flags |= vopt_is_recipient;
5236 debug_selector |= D_v;
5237 debug_file = stderr;
5238 debug_fd = fileno(debug_file);
5239 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5242 if (recipients_arg < argc)
5243 while (recipients_arg < argc)
5245 /* Supplied addresses are tainted since they come from a user */
5246 uschar * s = string_copy_taint(
5247 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5251 BOOL finished = FALSE;
5252 uschar *ss = parse_find_address_end(s, FALSE);
5253 if (*ss == ',') *ss = 0; else finished = TRUE;
5254 test_address(s, flags, &exit_value);
5257 while (*++s == ',' || isspace(*s)) ;
5263 uschar * s = get_stdinput(NULL, NULL);
5265 test_address(string_copy_taint(
5266 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5268 flags, &exit_value);
5272 exim_exit(exit_value);
5275 /* Handle expansion checking. Either expand items on the command line, or read
5276 from stdin if there aren't any. If -Mset was specified, load the message so
5277 that its variables can be used, but restrict this facility to admin users.
5278 Otherwise, if -bem was used, read a message from stdin. */
5282 dns_init(FALSE, FALSE, FALSE);
5283 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5287 exim_fail("exim: permission denied\n");
5288 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5289 /* Checking the length of the ID is sufficient to validate it.
5290 Get an untainted version so file opens can be done. */
5291 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5293 spoolname = string_sprintf("%s-H", message_id);
5294 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5295 printf ("Failed to load message datafile %s\n", message_id);
5296 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5297 printf ("Failed to load message %s\n", message_id);
5300 /* Read a test message from a file. We fudge it up to be on stdin, saving
5301 stdin itself for later reading of expansion strings. */
5303 else if (expansion_test_message)
5305 int save_stdin = dup(0);
5306 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5308 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5311 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5312 message_ended = END_NOTENDED;
5313 read_message_body(receive_msg(extract_recipients));
5314 message_linecount += body_linecount;
5315 (void)dup2(save_stdin, 0);
5316 (void)close(save_stdin);
5317 clearerr(stdin); /* Required by Darwin */
5320 /* Only admin users may see config-file macros this way */
5322 if (!f.admin_user) macros_user = macros = mlast = NULL;
5324 /* Allow $recipients for this testing */
5326 f.enable_dollar_recipients = TRUE;
5328 /* Expand command line items */
5330 if (recipients_arg < argc)
5331 while (recipients_arg < argc)
5332 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5338 char *(*fn_readline)(const char *) = NULL;
5339 void (*fn_addhist)(const char *) = NULL;
5343 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5346 while (s = get_stdinput(fn_readline, fn_addhist))
5347 expansion_test_line(s);
5350 if (dlhandle) dlclose(dlhandle);
5354 /* The data file will be open after -Mset */
5356 if (deliver_datafile >= 0)
5358 (void)close(deliver_datafile);
5359 deliver_datafile = -1;
5362 exim_exit(EXIT_SUCCESS);
5366 /* The active host name is normally the primary host name, but it can be varied
5367 for hosts that want to play several parts at once. We need to ensure that it is
5368 set for host checking, and for receiving messages. */
5370 smtp_active_hostname = primary_hostname;
5371 if (raw_active_hostname != NULL)
5373 uschar *nah = expand_string(raw_active_hostname);
5376 if (!f.expand_string_forcedfail)
5377 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5378 "(smtp_active_hostname): %s", raw_active_hostname,
5379 expand_string_message);
5381 else if (nah[0] != 0) smtp_active_hostname = nah;
5384 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5385 given IP address so that the blocking and relay configuration can be tested.
5386 Unless a sender_ident was set by -oMt, we discard it (the default is the
5387 caller's login name). An RFC 1413 call is made only if we are running in the
5388 test harness and an incoming interface and both ports are specified, because
5389 there is no TCP/IP call to find the ident for. */
5396 if (!sender_ident_set)
5398 sender_ident = NULL;
5399 if (f.running_in_test_harness && sender_host_port
5400 && interface_address && interface_port)
5401 verify_get_ident(1223); /* note hardwired port number */
5404 /* In case the given address is a non-canonical IPv6 address, canonicalize
5405 it. The code works for both IPv4 and IPv6, as it happens. */
5407 size = host_aton(sender_host_address, x);
5408 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5409 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5411 /* Now set up for testing */
5413 host_build_sender_fullhost();
5417 f.sender_local = FALSE;
5418 f.sender_host_notsocket = TRUE;
5419 debug_file = stderr;
5420 debug_fd = fileno(debug_file);
5421 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5422 "**** but without any ident (RFC 1413) callback.\n"
5423 "**** This is not for real!\n\n",
5424 sender_host_address);
5426 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5427 if (verify_check_host(&hosts_connection_nolog) == OK)
5428 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5429 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5431 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5432 because a log line has already been written for all its failure exists
5433 (usually "connection refused: <reason>") and writing another one is
5434 unnecessary clutter. */
5436 if (smtp_start_session())
5439 for (; (reset_point = store_mark()); store_reset(reset_point))
5441 if (smtp_setup_msg() <= 0) break;
5442 if (!receive_msg(FALSE)) break;
5444 return_path = sender_address = NULL;
5445 dnslist_domain = dnslist_matched = NULL;
5446 #ifndef DISABLE_DKIM
5447 dkim_cur_signer = NULL;
5450 deliver_localpart_orig = NULL;
5451 deliver_domain_orig = NULL;
5452 callout_address = sending_ip_address = NULL;
5453 deliver_localpart_data = deliver_domain_data =
5454 recipient_data = sender_data = NULL;
5455 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5459 exim_exit(EXIT_SUCCESS);
5463 /* Arrange for message reception if recipients or SMTP were specified;
5464 otherwise complain unless a version print (-bV) happened or this is a filter
5465 verification test or info dump.
5466 In the former case, show the configuration file name. */
5468 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5470 if (version_printed)
5472 if (Ustrchr(config_main_filelist, ':'))
5473 printf("Configuration file search path is %s\n", config_main_filelist);
5474 printf("Configuration file is %s\n", config_main_filename);
5475 return EXIT_SUCCESS;
5478 if (info_flag != CMDINFO_NONE)
5480 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5481 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5484 if (filter_test == FTEST_NONE)
5485 exim_usage(called_as);
5489 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5490 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5491 that we are not called from inetd, because that is rejected above. The
5492 following configuration settings are forced here:
5494 (1) Synchronous delivery (-odi)
5495 (2) Errors to stderr (-oep == -oeq)
5496 (3) No parallel remote delivery
5497 (4) Unprivileged delivery
5499 We don't force overall queueing options because there are several of them;
5500 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5501 to override any SMTP queueing. */
5505 f.synchronous_delivery = TRUE;
5506 arg_error_handling = ERRORS_STDERR;
5507 remote_max_parallel = 1;
5508 deliver_drop_privilege = TRUE;
5509 f.queue_smtp = FALSE;
5510 queue_smtp_domains = NULL;
5512 message_utf8_downconvert = -1; /* convert-if-needed */
5517 /* Prepare to accept one or more new messages on the standard input. When a
5518 message has been read, its id is returned in message_id[]. If doing immediate
5519 delivery, we fork a delivery process for each received message, except for the
5520 last one, where we can save a process switch.
5522 It is only in non-smtp mode that error_handling is allowed to be changed from
5523 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5524 sendmail error modes other than -oem ever actually used? Later: yes.) */
5526 if (!smtp_input) error_handling = arg_error_handling;
5528 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5529 logging being sent down the socket and make an identd call to get the
5532 else if (f.is_inetd)
5534 (void)fclose(stderr);
5535 exim_nullstd(); /* Re-open to /dev/null */
5536 verify_get_ident(IDENT_PORT);
5537 host_build_sender_fullhost();
5538 set_process_info("handling incoming connection from %s via inetd",
5542 /* If the sender host address has been set, build sender_fullhost if it hasn't
5543 already been done (which it will have been for inetd). This caters for the
5544 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5545 so that the test for IP options is skipped for -bs input. */
5547 if (sender_host_address && !sender_fullhost)
5549 host_build_sender_fullhost();
5550 set_process_info("handling incoming connection from %s via -oMa",
5552 f.sender_host_notsocket = TRUE;
5555 /* Otherwise, set the sender host as unknown except for inetd calls. This
5556 prevents host checking in the case of -bs not from inetd and also for -bS. */
5558 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5560 /* If stdout does not exist, then dup stdin to stdout. This can happen
5561 if exim is started from inetd. In this case fd 0 will be set to the socket,
5562 but fd 1 will not be set. This also happens for passed SMTP channels. */
5564 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5566 /* Set up the incoming protocol name and the state of the program. Root is
5567 allowed to force received protocol via the -oMr option above. If we have come
5568 via inetd, the process info has already been set up. We don't set
5569 received_protocol here for smtp input, as it varies according to
5570 batch/HELO/EHLO/AUTH/TLS. */
5574 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5575 smtp_batched_input? "batched " : "",
5576 sender_address ? sender_address : originator_login);
5580 int old_pool = store_pool;
5581 store_pool = POOL_PERM;
5582 if (!received_protocol)
5583 received_protocol = string_sprintf("local%s", called_as);
5584 store_pool = old_pool;
5585 set_process_info("accepting a local non-SMTP message from <%s>",
5589 /* Initialize the session_local_queue-only flag (this will be ignored if
5590 mua_wrapper is set) */
5593 session_local_queue_only = queue_only;
5595 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5596 the spool if so configured. On failure, we must not attempt to send an error
5597 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5598 error code is given.) */
5600 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5601 exim_fail("exim: insufficient disk space\n");
5603 /* If this is smtp input of any kind, real or batched, handle the start of the
5606 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5607 because a log line has already been written for all its failure exists
5608 (usually "connection refused: <reason>") and writing another one is
5609 unnecessary clutter. */
5615 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5616 if (verify_check_host(&hosts_connection_nolog) == OK)
5617 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5618 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5619 if (!smtp_start_session())
5622 exim_exit(EXIT_SUCCESS);
5626 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5627 (we handle buferring so as to have visibility of fill level). */
5631 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5632 if (expand_string_message)
5633 if (thismessage_size_limit == -1)
5634 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5635 "message_size_limit: %s", expand_string_message);
5637 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5638 "message_size_limit: %s", expand_string_message);
5640 setvbuf(stdin, NULL, _IONBF, 0);
5643 /* Loop for several messages when reading SMTP input. If we fork any child
5644 processes, we don't want to wait for them unless synchronous delivery is
5645 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5646 same as SIG_DFL, despite the fact that documentation often lists the default as
5647 "ignore". This is a confusing area. This is what I know:
5649 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5650 processes that complete simply to go away without ever becoming defunct. You
5651 can't then wait for them - but we don't want to wait for them in the
5652 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5653 happen for all OS (e.g. *BSD is different).
5655 But that's not the end of the story. Some (many? all?) systems have the
5656 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5657 has by default, so it seems that the difference is merely one of default
5658 (compare restarting vs non-restarting signals).
5660 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5661 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5662 of the loop below. Paranoia rules.
5664 February 2003: That's *still* not the end of the story. There are now versions
5665 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5666 process then calls waitpid(), a grumble is written to the system log, because
5667 this is logically inconsistent. In other words, it doesn't like the paranoia.
5668 As a consequence of this, the waitpid() below is now excluded if we are sure
5669 that SIG_IGN works. */
5671 if (!f.synchronous_delivery)
5674 struct sigaction act;
5675 act.sa_handler = SIG_IGN;
5676 sigemptyset(&(act.sa_mask));
5677 act.sa_flags = SA_NOCLDWAIT;
5678 sigaction(SIGCHLD, &act, NULL);
5680 signal(SIGCHLD, SIG_IGN);
5684 /* Save the current store pool point, for resetting at the start of
5685 each message, and save the real sender address, if any. */
5687 real_sender_address = sender_address;
5689 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5690 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5693 for (BOOL more = TRUE; more; )
5695 rmark reset_point = store_mark();
5698 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5699 input and build the recipients list, before calling receive_msg() to read the
5700 message proper. Whatever sender address is given in the SMTP transaction is
5701 often ignored for local senders - we use the actual sender, which is normally
5702 either the underlying user running this process or a -f argument provided by
5703 a trusted caller. It is saved in real_sender_address. The test for whether to
5704 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5709 if ((rc = smtp_setup_msg()) > 0)
5711 if (real_sender_address != NULL &&
5712 !receive_check_set_sender(sender_address))
5714 sender_address = raw_sender = real_sender_address;
5715 sender_address_unrewritten = NULL;
5718 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5719 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5720 the very end. The result of the ACL is ignored (as for other non-SMTP
5721 messages). It is run for its potential side effects. */
5723 if (smtp_batched_input && acl_not_smtp_start != NULL)
5725 uschar *user_msg, *log_msg;
5726 f.enable_dollar_recipients = TRUE;
5727 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5728 &user_msg, &log_msg);
5729 f.enable_dollar_recipients = FALSE;
5732 /* Now get the data for the message */
5734 more = receive_msg(extract_recipients);
5737 cancel_cutthrough_connection(TRUE, US"receive dropped");
5738 if (more) goto MORELOOP;
5739 smtp_log_no_mail(); /* Log no mail if configured */
5740 exim_exit(EXIT_FAILURE);
5745 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5746 smtp_log_no_mail(); /* Log no mail if configured */
5747 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5751 /* In the non-SMTP case, we have all the information from the command
5752 line, but must process it in case it is in the more general RFC822
5753 format, and in any case, to detect syntax errors. Also, it appears that
5754 the use of comma-separated lists as single arguments is common, so we
5755 had better support them. */
5760 int count = argc - recipients_arg;
5761 uschar **list = argv + recipients_arg;
5763 /* These options cannot be changed dynamically for non-SMTP messages */
5765 f.active_local_sender_retain = local_sender_retain;
5766 f.active_local_from_check = local_from_check;
5768 /* Save before any rewriting */
5770 raw_sender = string_copy(sender_address);
5772 /* Loop for each argument (supplied by user hence tainted) */
5774 for (int i = 0; i < count; i++)
5776 int start, end, domain;
5778 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5779 * We'll still want to cap it to something, just in case. */
5780 uschar * s = string_copy_taint(
5781 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5784 /* Loop for each comma-separated address */
5788 BOOL finished = FALSE;
5790 uschar *ss = parse_find_address_end(s, FALSE);
5792 if (*ss == ',') *ss = 0; else finished = TRUE;
5794 /* Check max recipients - if -t was used, these aren't recipients */
5796 if (recipients_max > 0 && ++rcount > recipients_max &&
5797 !extract_recipients)
5798 if (error_handling == ERRORS_STDERR)
5800 fprintf(stderr, "exim: too many recipients\n");
5801 exim_exit(EXIT_FAILURE);
5805 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5806 errors_sender_rc : EXIT_FAILURE;
5810 BOOL b = allow_utf8_domains;
5811 allow_utf8_domains = TRUE;
5814 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5818 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5819 else allow_utf8_domains = b;
5824 if (domain == 0 && !f.allow_unqualified_recipient)
5827 errmess = US"unqualified recipient address not allowed";
5831 if (error_handling == ERRORS_STDERR)
5833 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5834 string_printing(list[i]), errmess);
5835 exim_exit(EXIT_FAILURE);
5841 eblock.text1 = string_printing(list[i]);
5842 eblock.text2 = errmess;
5844 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5845 errors_sender_rc : EXIT_FAILURE;
5848 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5851 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5855 /* Show the recipients when debugging */
5859 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5860 if (recipients_list)
5862 debug_printf("Recipients:\n");
5863 for (int i = 0; i < recipients_count; i++)
5864 debug_printf(" %s\n", recipients_list[i].address);
5868 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5869 ignored; rejecting here would just add complication, and it can just as
5870 well be done later. Allow $recipients to be visible in the ACL. */
5872 if (acl_not_smtp_start)
5874 uschar *user_msg, *log_msg;
5875 f.enable_dollar_recipients = TRUE;
5876 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5877 &user_msg, &log_msg);
5878 f.enable_dollar_recipients = FALSE;
5881 /* Pause for a while waiting for input. If none received in that time,
5882 close the logfile, if we had one open; then if we wait for a long-running
5883 datasource (months, in one use-case) log rotation will not leave us holding
5886 if (!receive_timeout)
5887 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5890 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5891 will just read the headers for the message, and not write anything onto the
5894 message_ended = END_NOTENDED;
5895 more = receive_msg(extract_recipients);
5897 /* more is always FALSE here (not SMTP message) when reading a message
5898 for real; when reading the headers of a message for filter testing,
5899 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5901 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5902 } /* Non-SMTP message reception */
5904 /* If this is a filter testing run, there are headers in store, but
5905 no message on the spool. Run the filtering code in testing mode, setting
5906 the domain to the qualify domain and the local part to the current user,
5907 unless they have been set by options. The prefix and suffix are left unset
5908 unless specified. The the return path is set to to the sender unless it has
5909 already been set from a return-path header in the message. */
5911 if (filter_test != FTEST_NONE)
5913 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5914 deliver_domain_orig = deliver_domain;
5915 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5916 deliver_localpart_orig = deliver_localpart;
5917 deliver_localpart_prefix = US ftest_prefix;
5918 deliver_localpart_suffix = US ftest_suffix;
5919 deliver_home = originator_home;
5923 printf("Return-path copied from sender\n");
5924 return_path = string_copy(sender_address);
5927 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5928 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5930 receive_add_recipient(
5931 string_sprintf("%s%s%s@%s",
5932 ftest_prefix ? ftest_prefix : US"",
5934 ftest_suffix ? ftest_suffix : US"",
5935 deliver_domain), -1);
5937 printf("Recipient = %s\n", recipients_list[0].address);
5938 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5939 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5941 if (chdir("/")) /* Get away from wherever the user is running this from */
5943 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5944 exim_exit(EXIT_FAILURE);
5947 /* Now we run either a system filter test, or a user filter test, or both.
5948 In the latter case, headers added by the system filter will persist and be
5949 available to the user filter. We need to copy the filter variables
5952 if (filter_test & FTEST_SYSTEM)
5953 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5954 exim_exit(EXIT_FAILURE);
5956 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5958 if (filter_test & FTEST_USER)
5959 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5960 exim_exit(EXIT_FAILURE);
5962 exim_exit(EXIT_SUCCESS);
5965 /* Else act on the result of message reception. We should not get here unless
5966 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5967 will be TRUE. If it is not, check on the number of messages received in this
5970 if ( !session_local_queue_only
5971 && smtp_accept_queue_per_connection > 0
5972 && receive_messagecount > smtp_accept_queue_per_connection)
5974 session_local_queue_only = TRUE;
5975 queue_only_reason = 2;
5978 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5979 and queue_only_load is set, check that the load average is below it. If it is
5980 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5981 default), we put the whole session into queue_only mode. It then remains this
5982 way for any subsequent messages on the same SMTP connection. This is a
5983 deliberate choice; even though the load average may fall, it doesn't seem
5984 right to deliver later messages on the same call when not delivering earlier
5985 ones. However, there are odd cases where this is not wanted, so this can be
5986 changed by setting queue_only_load_latch false. */
5988 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5989 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5991 queue_only_reason = 3;
5992 if (queue_only_load_latch) session_local_queue_only = TRUE;
5995 /* If running as an MUA wrapper, all queueing options and freezing options
5999 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6001 /* Log the queueing here, when it will get a message id attached, but
6002 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6005 if (local_queue_only)
6007 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6008 switch(queue_only_reason)
6011 log_write(L_delay_delivery,
6012 LOG_MAIN, "no immediate delivery: more than %d messages "
6013 "received in one connection", smtp_accept_queue_per_connection);
6017 log_write(L_delay_delivery,
6018 LOG_MAIN, "no immediate delivery: load average %.2f",
6019 (double)load_average/1000.0);
6024 else if (f.queue_only_policy || f.deliver_freeze)
6025 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6027 /* Else do the delivery unless the ACL or local_scan() called for queue only
6028 or froze the message. Always deliver in a separate process. A fork failure is
6029 not a disaster, as the delivery will eventually happen on a subsequent queue
6030 run. The search cache must be tidied before the fork, as the parent will
6031 do it before exiting. The child will trigger a lookup failure and
6032 thereby defer the delivery if it tries to use (for example) a cached ldap
6033 connection that the parent has called unbind on. */
6040 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6043 close_unwanted(); /* Close unwanted file descriptors and TLS */
6044 exim_nullstd(); /* Ensure std{in,out,err} exist */
6046 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6047 mode, deliver_drop_privilege is forced TRUE). */
6049 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6051 delivery_re_exec(CEE_EXEC_EXIT);
6052 /* Control does not return here. */
6055 /* No need to re-exec */
6057 rc = deliver_message(message_id, FALSE, FALSE);
6059 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6060 ? EXIT_SUCCESS : EXIT_FAILURE);
6065 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6066 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6067 "process: %s", strerror(errno));
6071 release_cutthrough_connection(US"msg passed for delivery");
6073 /* In the parent, wait if synchronous delivery is required. This will
6074 always be the case in MUA wrapper mode. */
6076 if (f.synchronous_delivery)
6079 while (wait(&status) != pid);
6080 if ((status & 0x00ff) != 0)
6081 log_write(0, LOG_MAIN|LOG_PANIC,
6082 "process %d crashed with signal %d while delivering %s",
6083 (int)pid, status & 0x00ff, message_id);
6084 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6089 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6090 automatically reaps children (see comments above the loop), clear away any
6091 finished subprocesses here, in case there are lots of messages coming in
6092 from the same source. */
6094 #ifndef SIG_IGN_WORKS
6095 while (waitpid(-1, NULL, WNOHANG) > 0);
6099 return_path = sender_address = NULL;
6100 authenticated_sender = NULL;
6101 deliver_localpart_orig = NULL;
6102 deliver_domain_orig = NULL;
6103 deliver_host = deliver_host_address = NULL;
6104 dnslist_domain = dnslist_matched = NULL;
6105 #ifdef WITH_CONTENT_SCAN
6106 malware_name = NULL;
6108 callout_address = NULL;
6109 sending_ip_address = NULL;
6110 deliver_localpart_data = deliver_domain_data =
6111 recipient_data = sender_data = NULL;
6113 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6115 store_reset(reset_point);
6118 exim_exit(EXIT_SUCCESS); /* Never returns */
6119 return 0; /* To stop compiler warning */