src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.58 2007/09/04 08:18:12 nm4 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2007 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17
  18
  19 /*************************************************
  20 *      Function interface to store functions     *
  21 *************************************************/
  22
  23 /* We need some real functions to pass to the PCRE regular expression library
  24 for store allocation via Exim's store manager. The normal calls are actually
  25 macros that pass over location information to make tracing easier. These
  26 functions just interface to the standard macro calls. A good compiler will
  27 optimize out the tail recursion and so not make them too expensive. There
  28 are two sets of functions; one for use when we want to retain the compiled
  29 regular expression for a long time; the other for short-term use. */
  30
  31 static void *
  32 function_store_get(size_t size)
  33 {
  34 return store_get((int)size);
  35 }
  36
  37 static void
  38 function_dummy_free(void *block) { block = block; }
  39
  40 static void *
  41 function_store_malloc(size_t size)
  42 {
  43 return store_malloc((int)size);
  44 }
  45
  46 static void
  47 function_store_free(void *block)
  48 {
  49 store_free(block);
  50 }
  51
  52
  53
  54
  55 /*************************************************
  56 *  Compile regular expression and panic on fail  *
  57 *************************************************/
  58
  59 /* This function is called when failure to compile a regular expression leads
  60 to a panic exit. In other cases, pcre_compile() is called directly. In many
  61 cases where this function is used, the results of the compilation are to be
  62 placed in long-lived store, so we temporarily reset the store management
  63 functions that PCRE uses if the use_malloc flag is set.
  64
  65 Argument:
  66   pattern     the pattern to compile
  67   caseless    TRUE if caseless matching is required
  68   use_malloc  TRUE if compile into malloc store
  69
  70 Returns:      pointer to the compiled pattern
  71 */
  72
  73 const pcre *
  74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  75 {
  76 int offset;
  77 int options = PCRE_COPT;
  78 const pcre *yield;
  79 const uschar *error;
  80 if (use_malloc)
  81   {
  82   pcre_malloc = function_store_malloc;
  83   pcre_free = function_store_free;
  84   }
  85 if (caseless) options |= PCRE_CASELESS;
  86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  87 pcre_malloc = function_store_get;
  88 pcre_free = function_dummy_free;
  89 if (yield == NULL)
  90   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  91     "%s at offset %d while compiling %s", error, offset, pattern);
  92 return yield;
  93 }
  94
  95
  96
  97
  98 /*************************************************
  99 *   Execute regular expression and set strings   *
 100 *************************************************/
 101
 102 /* This function runs a regular expression match, and sets up the pointers to
 103 the matched substrings.
 104
 105 Arguments:
 106   re          the compiled expression
 107   subject     the subject string
 108   options     additional PCRE options
 109   setup       if < 0 do full setup
 110               if >= 0 setup from setup+1 onwards,
 111                 excluding the full matched string
 112
 113 Returns:      TRUE or FALSE
 114 */
 115
 116 BOOL
 117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 118 {
 119 int ovector[3*(EXPAND_MAXN+1)];
 120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 121   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 122 BOOL yield = n >= 0;
 123 if (n == 0) n = EXPAND_MAXN + 1;
 124 if (yield)
 125   {
 126   int nn;
 127   expand_nmax = (setup < 0)? 0 : setup + 1;
 128   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 129     {
 130     expand_nstring[expand_nmax] = subject + ovector[nn];
 131     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 132     }
 133   expand_nmax--;
 134   }
 135 return yield;
 136 }
 137
 138
 139
 140
 141 /*************************************************
 142 *             Handler for SIGUSR1                *
 143 *************************************************/
 144
 145 /* SIGUSR1 causes any exim process to write to the process log details of
 146 what it is currently doing. It will only be used if the OS is capable of
 147 setting up a handler that causes automatic restarting of any system call
 148 that is in progress at the time.
 149
 150 Argument: the signal number (SIGUSR1)
 151 Returns:  nothing
 152 */
 153
 154 static void
 155 usr1_handler(int sig)
 156 {
 157 sig = sig;      /* Keep picky compilers happy */
 158 log_write(0, LOG_PROCESS, "%s", process_info);
 159 log_close_all();
 160 os_restarting_signal(SIGUSR1, usr1_handler);
 161 }
 162
 163
 164
 165 /*************************************************
 166 *             Timeout handler                    *
 167 *************************************************/
 168
 169 /* This handler is enabled most of the time that Exim is running. The handler
 170 doesn't actually get used unless alarm() has been called to set a timer, to
 171 place a time limit on a system call of some kind. When the handler is run, it
 172 re-enables itself.
 173
 174 There are some other SIGALRM handlers that are used in special cases when more
 175 than just a flag setting is required; for example, when reading a message's
 176 input. These are normally set up in the code module that uses them, and the
 177 SIGALRM handler is reset to this one afterwards.
 178
 179 Argument: the signal value (SIGALRM)
 180 Returns:  nothing
 181 */
 182
 183 void
 184 sigalrm_handler(int sig)
 185 {
 186 sig = sig;      /* Keep picky compilers happy */
 187 sigalrm_seen = TRUE;
 188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 189 }
 190
 191
 192
 193 /*************************************************
 194 *      Sleep for a fractional time interval      *
 195 *************************************************/
 196
 197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 198 period of time that may include a fraction of a second. The coding is somewhat
 199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 200 will wait for ever, so we panic in this instance. (There was a case of this
 201 when a bug in a function that calls milliwait() caused it to pass invalid data.
 202 That's when I added the check. :-)
 203
 204 Argument:  an itimerval structure containing the interval
 205 Returns:   nothing
 206 */
 207
 208 static void
 209 milliwait(struct itimerval *itval)
 210 {
 211 sigset_t sigmask;
 212 sigset_t old_sigmask;
 213 (void)sigemptyset(&sigmask);                           /* Empty mask */
 214 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 216 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 217   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 218     "setitimer() failed: %s", strerror(errno));
 219 (void)sigfillset(&sigmask);                            /* All signals */
 220 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 221 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 223 }
 224
 225
 226
 227
 228 /*************************************************
 229 *         Millisecond sleep function             *
 230 *************************************************/
 231
 232 /* The basic sleep() function has a granularity of 1 second, which is too rough
 233 in some cases - for example, when using an increasing delay to slow down
 234 spammers.
 235
 236 Argument:    number of millseconds
 237 Returns:     nothing
 238 */
 239
 240 void
 241 millisleep(int msec)
 242 {
 243 struct itimerval itval;
 244 itval.it_interval.tv_sec = 0;
 245 itval.it_interval.tv_usec = 0;
 246 itval.it_value.tv_sec = msec/1000;
 247 itval.it_value.tv_usec = (msec % 1000) * 1000;
 248 milliwait(&itval);
 249 }
 250
 251
 252
 253 /*************************************************
 254 *         Compare microsecond times              *
 255 *************************************************/
 256
 257 /*
 258 Arguments:
 259   tv1         the first time
 260   tv2         the second time
 261
 262 Returns:      -1, 0, or +1
 263 */
 264
 265 int
 266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 267 {
 268 if (t1->tv_sec > t2->tv_sec) return +1;
 269 if (t1->tv_sec < t2->tv_sec) return -1;
 270 if (t1->tv_usec > t2->tv_usec) return +1;
 271 if (t1->tv_usec < t2->tv_usec) return -1;
 272 return 0;
 273 }
 274
 275
 276
 277
 278 /*************************************************
 279 *          Clock tick wait function              *
 280 *************************************************/
 281
 282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 283 message IDs, and in file names for maildir deliveries. Because some OS now
 284 re-use pids within the same second, sub-second times are now being used.
 285 However, for absolute certaintly, we must ensure the clock has ticked before
 286 allowing the relevant process to complete. At the time of implementation of
 287 this code (February 2003), the speed of processors is such that the clock will
 288 invariably have ticked already by the time a process has done its job. This
 289 function prepares for the time when things are faster - and it also copes with
 290 clocks that go backwards.
 291
 292 Arguments:
 293   then_tv      A timeval which was used to create uniqueness; its usec field
 294                  has been rounded down to the value of the resolution.
 295                  We want to be sure the current time is greater than this.
 296   resolution   The resolution that was used to divide the microseconds
 297                  (1 for maildir, larger for message ids)
 298
 299 Returns:       nothing
 300 */
 301
 302 void
 303 exim_wait_tick(struct timeval *then_tv, int resolution)
 304 {
 305 struct timeval now_tv;
 306 long int now_true_usec;
 307
 308 (void)gettimeofday(&now_tv, NULL);
 309 now_true_usec = now_tv.tv_usec;
 310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 311
 312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 313   {
 314   struct itimerval itval;
 315   itval.it_interval.tv_sec = 0;
 316   itval.it_interval.tv_usec = 0;
 317   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 318   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 319
 320   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 321   negative value for the microseconds is possible only in the case when "now"
 322   is more than a second less than "then". That means that itval.it_value.tv_sec
 323   is greater than zero. The following correction is therefore safe. */
 324
 325   if (itval.it_value.tv_usec < 0)
 326     {
 327     itval.it_value.tv_usec += 1000000;
 328     itval.it_value.tv_sec -= 1;
 329     }
 330
 331   DEBUG(D_transport|D_receive)
 332     {
 333     if (!running_in_test_harness)
 334       {
 335       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 336         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 337       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 338         itval.it_value.tv_usec);
 339       }
 340     }
 341
 342   milliwait(&itval);
 343   }
 344 }
 345
 346
 347
 348
 349 /*************************************************
 350 *            Set up processing details           *
 351 *************************************************/
 352
 353 /* Save a text string for dumping when SIGUSR1 is received.
 354 Do checks for overruns.
 355
 356 Arguments: format and arguments, as for printf()
 357 Returns:   nothing
 358 */
 359
 360 void
 361 set_process_info(char *format, ...)
 362 {
 363 int len;
 364 va_list ap;
 365 sprintf(CS process_info, "%5d ", (int)getpid());
 366 len = Ustrlen(process_info);
 367 va_start(ap, format);
 368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 369   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 371 va_end(ap);
 372 }
 373
 374
 375
 376
 377
 378 /*************************************************
 379 *   Call fopen() with umask 777 and adjust mode  *
 380 *************************************************/
 381
 382 /* Exim runs with umask(0) so that files created with open() have the mode that
 383 is specified in the open() call. However, there are some files, typically in
 384 the spool directory, that are created with fopen(). They end up world-writeable
 385 if no precautions are taken. Although the spool directory is not accessible to
 386 the world, this is an untidiness. So this is a wrapper function for fopen()
 387 that sorts out the mode of the created file.
 388
 389 Arguments:
 390    filename       the file name
 391    options        the fopen() options
 392    mode           the required mode
 393
 394 Returns:          the fopened FILE or NULL
 395 */
 396
 397 FILE *
 398 modefopen(uschar *filename, char *options, mode_t mode)
 399 {
 400 mode_t saved_umask = umask(0777);
 401 FILE *f = Ufopen(filename, options);
 402 (void)umask(saved_umask);
 403 if (f != NULL) (void)fchmod(fileno(f), mode);
 404 return f;
 405 }
 406
 407
 408
 409
 410 /*************************************************
 411 *   Ensure stdin, stdout, and stderr exist       *
 412 *************************************************/
 413
 414 /* Some operating systems grumble if an exec() happens without a standard
 415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 416 file will be opened and will use these fd values, and then some other bit of
 417 code will assume, for example, that it can write error messages to stderr.
 418 This function ensures that fds 0, 1, and 2 are open if they do not already
 419 exist, by connecting them to /dev/null.
 420
 421 This function is also used to ensure that std{in,out,err} exist at all times,
 422 so that if any library that Exim calls tries to use them, it doesn't crash.
 423
 424 Arguments:  None
 425 Returns:    Nothing
 426 */
 427
 428 void
 429 exim_nullstd(void)
 430 {
 431 int i;
 432 int devnull = -1;
 433 struct stat statbuf;
 434 for (i = 0; i <= 2; i++)
 435   {
 436   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 437     {
 438     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 439     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 440       string_open_failed(errno, "/dev/null"));
 441     if (devnull != i) (void)dup2(devnull, i);
 442     }
 443   }
 444 if (devnull > 2) (void)close(devnull);
 445 }
 446
 447
 448
 449
 450 /*************************************************
 451 *   Close unwanted file descriptors for delivery *
 452 *************************************************/
 453
 454 /* This function is called from a new process that has been forked to deliver
 455 an incoming message, either directly, or using exec.
 456
 457 We want any smtp input streams to be closed in this new process. However, it
 458 has been observed that using fclose() here causes trouble. When reading in -bS
 459 input, duplicate copies of messages have been seen. The files will be sharing a
 460 file pointer with the parent process, and it seems that fclose() (at least on
 461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 462 least sometimes. Hence we go for closing the underlying file descriptors.
 463
 464 If TLS is active, we want to shut down the TLS library, but without molesting
 465 the parent's SSL connection.
 466
 467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 468 stderr unless debugging) because the calling process might have set them up as
 469 pipes and be waiting for them to close before it waits for the submission
 470 process to terminate. If they aren't closed, they hold up the calling process
 471 until the initial delivery process finishes, which is not what we want.
 472
 473 Exception: We do want it for synchronous delivery!
 474
 475 And notwithstanding all the above, if D_resolver is set, implying resolver
 476 debugging, leave stdout open, because that's where the resolver writes its
 477 debugging output.
 478
 479 When we close stderr (which implies we've also closed stdout), we also get rid
 480 of any controlling terminal.
 481
 482 Arguments:   None
 483 Returns:     Nothing
 484 */
 485
 486 static void
 487 close_unwanted(void)
 488 {
 489 if (smtp_input)
 490   {
 491   #ifdef SUPPORT_TLS
 492   tls_close(FALSE);      /* Shut down the TLS library */
 493   #endif
 494   (void)close(fileno(smtp_in));
 495   (void)close(fileno(smtp_out));
 496   smtp_in = NULL;
 497   }
 498 else
 499   {
 500   (void)close(0);                                          /* stdin */
 501   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 502   if (debug_selector == 0)                                 /* stderr */
 503     {
 504     if (!synchronous_delivery)
 505       {
 506       (void)close(2);
 507       log_stderr = NULL;
 508       }
 509     (void)setsid();
 510     }
 511   }
 512 }
 513
 514
 515
 516
 517 /*************************************************
 518 *          Set uid and gid                       *
 519 *************************************************/
 520
 521 /* This function sets a new uid and gid permanently, optionally calling
 522 initgroups() to set auxiliary groups. There are some special cases when running
 523 Exim in unprivileged modes. In these situations the effective uid will not be
 524 root; if we already have the right effective uid/gid, and don't need to
 525 initialize any groups, leave things as they are.
 526
 527 Arguments:
 528   uid        the uid
 529   gid        the gid
 530   igflag     TRUE if initgroups() wanted
 531   msg        text to use in debugging output and failure log
 532
 533 Returns:     nothing; bombs out on failure
 534 */
 535
 536 void
 537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 538 {
 539 uid_t euid = geteuid();
 540 gid_t egid = getegid();
 541
 542 if (euid == root_uid || euid != uid || egid != gid || igflag)
 543   {
 544   /* At least one OS returns +1 for initgroups failure, so just check for
 545   non-zero. */
 546
 547   if (igflag)
 548     {
 549     struct passwd *pw = getpwuid(uid);
 550     if (pw != NULL)
 551       {
 552       if (initgroups(pw->pw_name, gid) != 0)
 553         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 554           (long int)uid, strerror(errno));
 555       }
 556     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 557       "no passwd entry for uid=%ld", (long int)uid);
 558     }
 559
 560   if (setgid(gid) < 0 || setuid(uid) < 0)
 561     {
 562     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 563       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 564     }
 565   }
 566
 567 /* Debugging output included uid/gid and all groups */
 568
 569 DEBUG(D_uid)
 570   {
 571   int group_count;
 572   gid_t group_list[NGROUPS_MAX];
 573   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 574     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 575   group_count = getgroups(NGROUPS_MAX, group_list);
 576   debug_printf("  auxiliary group list:");
 577   if (group_count > 0)
 578     {
 579     int i;
 580     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 581     }
 582   else debug_printf(" <none>");
 583   debug_printf("\n");
 584   }
 585 }
 586
 587
 588
 589
 590 /*************************************************
 591 *               Exit point                       *
 592 *************************************************/
 593
 594 /* Exim exits via this function so that it always clears up any open
 595 databases.
 596
 597 Arguments:
 598   rc         return code
 599
 600 Returns:     does not return
 601 */
 602
 603 void
 604 exim_exit(int rc)
 605 {
 606 search_tidyup();
 607 DEBUG(D_any)
 608   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 609     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 610 exit(rc);
 611 }
 612
 613
 614
 615
 616 /*************************************************
 617 *         Extract port from host address         *
 618 *************************************************/
 619
 620 /* Called to extract the port from the values given to -oMa and -oMi.
 621 It also checks the syntax of the address, and terminates it before the
 622 port data when a port is extracted.
 623
 624 Argument:
 625   address   the address, with possible port on the end
 626
 627 Returns:    the port, or zero if there isn't one
 628             bombs out on a syntax error
 629 */
 630
 631 static int
 632 check_port(uschar *address)
 633 {
 634 int port = host_address_extract_port(address);
 635 if (string_is_ip_address(address, NULL) == 0)
 636   {
 637   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 638   exit(EXIT_FAILURE);
 639   }
 640 return port;
 641 }
 642
 643
 644
 645 /*************************************************
 646 *              Test/verify an address            *
 647 *************************************************/
 648
 649 /* This function is called by the -bv and -bt code. It extracts a working
 650 address from a full RFC 822 address. This isn't really necessary per se, but it
 651 has the effect of collapsing source routes.
 652
 653 Arguments:
 654   s            the address string
 655   flags        flag bits for verify_address()
 656   exit_value   to be set for failures
 657
 658 Returns:       nothing
 659 */
 660
 661 static void
 662 test_address(uschar *s, int flags, int *exit_value)
 663 {
 664 int start, end, domain;
 665 uschar *parse_error = NULL;
 666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 667   FALSE);
 668 if (address == NULL)
 669   {
 670   fprintf(stdout, "syntax error: %s\n", parse_error);
 671   *exit_value = 2;
 672   }
 673 else
 674   {
 675   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 676     -1, -1, NULL, NULL, NULL);
 677   if (rc == FAIL) *exit_value = 2;
 678     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 679   }
 680 }
 681
 682
 683
 684 /*************************************************
 685 *         Decode bit settings for log/debug      *
 686 *************************************************/
 687
 688 /* This function decodes a string containing bit settings in the form of +name
 689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 690 also recognizes a numeric setting of the form =<number>, but this is not
 691 intended for user use. It's an easy way for Exim to pass the debug settings
 692 when it is re-exec'ed.
 693
 694 The log options are held in two unsigned ints (because there became too many
 695 for one). The top bit in the table means "put in 2nd selector". This does not
 696 yet apply to debug options, so the "=" facility sets only the first selector.
 697
 698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
 699 It sets all the bits in both selectors. However, there is a facility for then
 700 unsetting certain bits, because we want to turn off "memory" in the debug case.
 701
 702 A bad value for a debug setting is treated as an unknown option - error message
 703 to stderr and die. For log settings, which come from the configuration file,
 704 we write to the log on the way out...
 705
 706 Arguments:
 707   selector1      address of the first bit string
 708   selector2      address of the second bit string, or NULL
 709   notall1        bits to exclude from "all" for selector1
 710   notall2        bits to exclude from "all" for selector2
 711   string         the configured string
 712   options        the table of option names
 713   count          size of table
 714   which          "log" or "debug"
 715
 716 Returns:         nothing on success - bomb out on failure
 717 */
 718
 719 static void
 720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
 721   int notall2, uschar *string, bit_table *options, int count, uschar *which)
 722 {
 723 uschar *errmsg;
 724 if (string == NULL) return;
 725
 726 if (*string == '=')
 727   {
 728   char *end;    /* Not uschar */
 729   *selector1 = strtoul(CS string+1, &end, 0);
 730   if (*end == 0) return;
 731   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 732     string);
 733   goto ERROR_RETURN;
 734   }
 735
 736 /* Handle symbolic setting */
 737
 738 else for(;;)
 739   {
 740   BOOL adding;
 741   uschar *s;
 742   int len;
 743   bit_table *start, *end;
 744
 745   while (isspace(*string)) string++;
 746   if (*string == 0) return;
 747
 748   if (*string != '+' && *string != '-')
 749     {
 750     errmsg = string_sprintf("malformed %s_selector setting: "
 751       "+ or - expected but found \"%s\"", which, string);
 752     goto ERROR_RETURN;
 753     }
 754
 755   adding = *string++ == '+';
 756   s = string;
 757   while (isalnum(*string) || *string == '_') string++;
 758   len = string - s;
 759
 760   start = options;
 761   end = options + count;
 762
 763   while (start < end)
 764     {
 765     bit_table *middle = start + (end - start)/2;
 766     int c = Ustrncmp(s, middle->name, len);
 767     if (c == 0)
 768       {
 769       if (middle->name[len] != 0) c = -1; else
 770         {
 771         unsigned int bit = middle->bit;
 772         unsigned int *selector;
 773
 774         /* The value with all bits set means "force all bits in both selectors"
 775         in the case where two are being handled. However, the top bit in the
 776         second selector is never set. When setting, some bits can be excluded.
 777         */
 778
 779         if (bit == 0xffffffff)
 780           {
 781           if (adding)
 782             {
 783             *selector1 = 0xffffffff ^ notall1;
 784             if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
 785             }
 786           else
 787             {
 788             *selector1 = 0;
 789             if (selector2 != NULL) *selector2 = 0;
 790             }
 791           }
 792
 793         /* Otherwise, the 0x80000000 bit means "this value, without the top
 794         bit, belongs in the second selector". */
 795
 796         else
 797           {
 798           if ((bit & 0x80000000) != 0)
 799             {
 800             selector = selector2;
 801             bit &= 0x7fffffff;
 802             }
 803           else selector = selector1;
 804           if (adding) *selector |= bit; else *selector &= ~bit;
 805           }
 806         break;  /* Out of loop to match selector name */
 807         }
 808       }
 809     if (c < 0) end = middle; else start = middle + 1;
 810     }  /* Loop to match selector name */
 811
 812   if (start >= end)
 813     {
 814     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 815       adding? '+' : '-', len, s);
 816     goto ERROR_RETURN;
 817     }
 818   }    /* Loop for selector names */
 819
 820 /* Handle disasters */
 821
 822 ERROR_RETURN:
 823 if (Ustrcmp(which, "debug") == 0)
 824   {
 825   fprintf(stderr, "exim: %s\n", errmsg);
 826   exit(EXIT_FAILURE);
 827   }
 828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 829 }
 830
 831
 832
 833 /*************************************************
 834 *          Show supported features               *
 835 *************************************************/
 836
 837 /* This function is called for -bV and for -d to output the optional features
 838 of the current Exim binary.
 839
 840 Arguments:  a FILE for printing
 841 Returns:    nothing
 842 */
 843
 844 static void
 845 show_whats_supported(FILE *f)
 846 {
 847 #ifdef DB_VERSION_STRING
 848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 850   #ifdef USE_DB
 851   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 852   #else
 853   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 854   #endif
 855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 856 fprintf(f, "Probably ndbm\n");
 857 #elif defined(USE_TDB)
 858 fprintf(f, "Using tdb\n");
 859 #else
 860   #ifdef USE_GDBM
 861   fprintf(f, "Probably GDBM (native mode)\n");
 862   #else
 863   fprintf(f, "Probably GDBM (compatibility mode)\n");
 864   #endif
 865 #endif
 866
 867 fprintf(f, "Support for:");
 868 #ifdef SUPPORT_CRYPTEQ
 869   fprintf(f, " crypteq");
 870 #endif
 871 #if HAVE_ICONV
 872   fprintf(f, " iconv()");
 873 #endif
 874 #if HAVE_IPV6
 875   fprintf(f, " IPv6");
 876 #endif
 877 #ifdef HAVE_SETCLASSRESOURCES
 878   fprintf(f, " use_setclassresources");
 879 #endif
 880 #ifdef SUPPORT_PAM
 881   fprintf(f, " PAM");
 882 #endif
 883 #ifdef EXIM_PERL
 884   fprintf(f, " Perl");
 885 #endif
 886 #ifdef EXPAND_DLFUNC
 887   fprintf(f, " Expand_dlfunc");
 888 #endif
 889 #ifdef USE_TCP_WRAPPERS
 890   fprintf(f, " TCPwrappers");
 891 #endif
 892 #ifdef SUPPORT_TLS
 893   #ifdef USE_GNUTLS
 894   fprintf(f, " GnuTLS");
 895   #else
 896   fprintf(f, " OpenSSL");
 897   #endif
 898 #endif
 899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 900   fprintf(f, " translate_ip_address");
 901 #endif
 902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 903   fprintf(f, " move_frozen_messages");
 904 #endif
 905 #ifdef WITH_CONTENT_SCAN
 906   fprintf(f, " Content_Scanning");
 907 #endif
 908 #ifdef WITH_OLD_DEMIME
 909   fprintf(f, " Old_Demime");
 910 #endif
 911 #ifdef EXPERIMENTAL_SPF
 912   fprintf(f, " Experimental_SPF");
 913 #endif
 914 #ifdef EXPERIMENTAL_SRS
 915   fprintf(f, " Experimental_SRS");
 916 #endif
 917 #ifdef EXPERIMENTAL_BRIGHTMAIL
 918   fprintf(f, " Experimental_Brightmail");
 919 #endif
 920 #ifdef EXPERIMENTAL_DOMAINKEYS
 921   fprintf(f, " Experimental_DomainKeys");
 922 #endif
 923 fprintf(f, "\n");
 924
 925 fprintf(f, "Lookups:");
 926 #ifdef LOOKUP_LSEARCH
 927   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 928 #endif
 929 #ifdef LOOKUP_CDB
 930   fprintf(f, " cdb");
 931 #endif
 932 #ifdef LOOKUP_DBM
 933   fprintf(f, " dbm dbmnz");
 934 #endif
 935 #ifdef LOOKUP_DNSDB
 936   fprintf(f, " dnsdb");
 937 #endif
 938 #ifdef LOOKUP_DSEARCH
 939   fprintf(f, " dsearch");
 940 #endif
 941 #ifdef LOOKUP_IBASE
 942   fprintf(f, " ibase");
 943 #endif
 944 #ifdef LOOKUP_LDAP
 945   fprintf(f, " ldap ldapdn ldapm");
 946 #endif
 947 #ifdef LOOKUP_MYSQL
 948   fprintf(f, " mysql");
 949 #endif
 950 #ifdef LOOKUP_NIS
 951   fprintf(f, " nis nis0");
 952 #endif
 953 #ifdef LOOKUP_NISPLUS
 954   fprintf(f, " nisplus");
 955 #endif
 956 #ifdef LOOKUP_ORACLE
 957   fprintf(f, " oracle");
 958 #endif
 959 #ifdef LOOKUP_PASSWD
 960   fprintf(f, " passwd");
 961 #endif
 962 #ifdef LOOKUP_PGSQL
 963   fprintf(f, " pgsql");
 964 #endif
 965 #ifdef LOOKUP_SQLITE
 966   fprintf(f, " sqlite");
 967 #endif
 968 #ifdef LOOKUP_TESTDB
 969   fprintf(f, " testdb");
 970 #endif
 971 #ifdef LOOKUP_WHOSON
 972   fprintf(f, " whoson");
 973 #endif
 974 fprintf(f, "\n");
 975
 976 fprintf(f, "Authenticators:");
 977 #ifdef AUTH_CRAM_MD5
 978   fprintf(f, " cram_md5");
 979 #endif
 980 #ifdef AUTH_CYRUS_SASL
 981   fprintf(f, " cyrus_sasl");
 982 #endif
 983 #ifdef AUTH_DOVECOT
 984   fprintf(f, " dovecot");
 985 #endif
 986 #ifdef AUTH_PLAINTEXT
 987   fprintf(f, " plaintext");
 988 #endif
 989 #ifdef AUTH_SPA
 990   fprintf(f, " spa");
 991 #endif
 992 fprintf(f, "\n");
 993
 994 fprintf(f, "Routers:");
 995 #ifdef ROUTER_ACCEPT
 996   fprintf(f, " accept");
 997 #endif
 998 #ifdef ROUTER_DNSLOOKUP
 999   fprintf(f, " dnslookup");
1000 #endif
1001 #ifdef ROUTER_IPLITERAL
1002   fprintf(f, " ipliteral");
1003 #endif
1004 #ifdef ROUTER_IPLOOKUP
1005   fprintf(f, " iplookup");
1006 #endif
1007 #ifdef ROUTER_MANUALROUTE
1008   fprintf(f, " manualroute");
1009 #endif
1010 #ifdef ROUTER_QUERYPROGRAM
1011   fprintf(f, " queryprogram");
1012 #endif
1013 #ifdef ROUTER_REDIRECT
1014   fprintf(f, " redirect");
1015 #endif
1016 fprintf(f, "\n");
1017
1018 fprintf(f, "Transports:");
1019 #ifdef TRANSPORT_APPENDFILE
1020   fprintf(f, " appendfile");
1021   #ifdef SUPPORT_MAILDIR
1022     fprintf(f, "/maildir");
1023   #endif
1024   #ifdef SUPPORT_MAILSTORE
1025     fprintf(f, "/mailstore");
1026   #endif
1027   #ifdef SUPPORT_MBX
1028     fprintf(f, "/mbx");
1029   #endif
1030 #endif
1031 #ifdef TRANSPORT_AUTOREPLY
1032   fprintf(f, " autoreply");
1033 #endif
1034 #ifdef TRANSPORT_LMTP
1035   fprintf(f, " lmtp");
1036 #endif
1037 #ifdef TRANSPORT_PIPE
1038   fprintf(f, " pipe");
1039 #endif
1040 #ifdef TRANSPORT_SMTP
1041   fprintf(f, " smtp");
1042 #endif
1043 fprintf(f, "\n");
1044
1045 if (fixed_never_users[0] > 0)
1046   {
1047   int i;
1048   fprintf(f, "Fixed never_users: ");
1049   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1050     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1051   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1052   }
1053
1054 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1055 }
1056
1057
1058
1059
1060 /*************************************************
1061 *               Quote a local part               *
1062 *************************************************/
1063
1064 /* This function is used when a sender address or a From: or Sender: header
1065 line is being created from the caller's login, or from an authenticated_id. It
1066 applies appropriate quoting rules for a local part.
1067
1068 Argument:    the local part
1069 Returns:     the local part, quoted if necessary
1070 */
1071
1072 uschar *
1073 local_part_quote(uschar *lpart)
1074 {
1075 BOOL needs_quote = FALSE;
1076 int size, ptr;
1077 uschar *yield;
1078 uschar *t;
1079
1080 for (t = lpart; !needs_quote && *t != 0; t++)
1081   {
1082   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1083     (*t != '.' || t == lpart || t[1] == 0);
1084   }
1085
1086 if (!needs_quote) return lpart;
1087
1088 size = ptr = 0;
1089 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1090
1091 for (;;)
1092   {
1093   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1094   if (nq == NULL)
1095     {
1096     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1097     break;
1098     }
1099   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1100   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1101   yield = string_cat(yield, &size, &ptr, nq, 1);
1102   lpart = nq + 1;
1103   }
1104
1105 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1106 yield[ptr] = 0;
1107 return yield;
1108 }
1109
1110
1111
1112 #ifdef USE_READLINE
1113 /*************************************************
1114 *         Load readline() functions              *
1115 *************************************************/
1116
1117 /* This function is called from testing executions that read data from stdin,
1118 but only when running as the calling user. Currently, only -be does this. The
1119 function loads the readline() function library and passes back the functions.
1120 On some systems, it needs the curses library, so load that too, but try without
1121 it if loading fails. All this functionality has to be requested at build time.
1122
1123 Arguments:
1124   fn_readline_ptr   pointer to where to put the readline pointer
1125   fn_addhist_ptr    pointer to where to put the addhistory function
1126
1127 Returns:            the dlopen handle or NULL on failure
1128 */
1129
1130 static void *
1131 set_readline(char * (**fn_readline_ptr)(char *),
1132              char * (**fn_addhist_ptr)(char *))
1133 {
1134 void *dlhandle;
1135 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1136
1137 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1138 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1139
1140 if (dlhandle != NULL)
1141   {
1142   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1143   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1144   }
1145 else
1146   {
1147   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1148   }
1149
1150 return dlhandle;
1151 }
1152 #endif
1153
1154
1155
1156 /*************************************************
1157 *    Get a line from stdin for testing things    *
1158 *************************************************/
1159
1160 /* This function is called when running tests that can take a number of lines
1161 of input (for example, -be and -bt). It handles continuations and trailing
1162 spaces. And prompting and a blank line output on eof. If readline() is in use,
1163 the arguments are non-NULL and provide the relevant functions.
1164
1165 Arguments:
1166   fn_readline   readline function or NULL
1167   fn_addhist    addhist function or NULL
1168
1169 Returns:        pointer to dynamic memory, or NULL at end of file
1170 */
1171
1172 static uschar *
1173 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1174 {
1175 int i;
1176 int size = 0;
1177 int ptr = 0;
1178 uschar *yield = NULL;
1179
1180 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1181
1182 for (i = 0;; i++)
1183   {
1184   uschar buffer[1024];
1185   uschar *p, *ss;
1186
1187   #ifdef USE_READLINE
1188   char *readline_line = NULL;
1189   if (fn_readline != NULL)
1190     {
1191     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1192     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1193     p = US readline_line;
1194     }
1195   else
1196   #endif
1197
1198   /* readline() not in use */
1199
1200     {
1201     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1202     p = buffer;
1203     }
1204
1205   /* Handle the line */
1206
1207   ss = p + (int)Ustrlen(p);
1208   while (ss > p && isspace(ss[-1])) ss--;
1209
1210   if (i > 0)
1211     {
1212     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1213     }
1214
1215   yield = string_cat(yield, &size, &ptr, p, ss - p);
1216
1217   #ifdef USE_READLINE
1218   if (fn_readline != NULL) free(readline_line);
1219   #endif
1220
1221   if (ss == p || yield[ptr-1] != '\\')
1222     {
1223     yield[ptr] = 0;
1224     break;
1225     }
1226   yield[--ptr] = 0;
1227   }
1228
1229 if (yield == NULL) printf("\n");
1230 return yield;
1231 }
1232
1233
1234
1235 /*************************************************
1236 *    Output usage information for the program    *
1237 *************************************************/
1238
1239 /* This function is called when there are no recipients
1240    or a specific --help argument was added.
1241
1242 Arguments:
1243   progname      information on what name we were called by
1244
1245 Returns:        DOES NOT RETURN
1246 */
1247
1248 static void
1249 exim_usage(uschar *progname)
1250 {
1251
1252 /* Handle specific program invocation varients */
1253 if (Ustrcmp(progname, US"-mailq") == 0)
1254   {
1255   fprintf(stderr,
1256     "mailq - list the contents of the mail queue\n\n",
1257     "For a list of options, see the Exim documentation.\n");
1258   exit(EXIT_FAILURE);
1259   }
1260
1261 /* Generic usage - we output this whatever happens */
1262 fprintf(stderr,
1263   "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1264   "not directly from a shell command line. Options and/or arguments control\n"
1265   "what it does when called. For a list of options, see the Exim documentation.\n");
1266
1267 exit(EXIT_FAILURE);
1268 }
1269
1270
1271
1272 /*************************************************
1273 *          Entry point and high-level code       *
1274 *************************************************/
1275
1276 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1277 the appropriate action. All the necessary functions are present in the one
1278 binary. I originally thought one should split it up, but it turns out that so
1279 much of the apparatus is needed in each chunk that one might as well just have
1280 it all available all the time, which then makes the coding easier as well.
1281
1282 Arguments:
1283   argc      count of entries in argv
1284   argv      argument strings, with argv[0] being the program name
1285
1286 Returns:    EXIT_SUCCESS if terminated successfully
1287             EXIT_FAILURE otherwise, except when a message has been sent
1288               to the sender, and -oee was given
1289 */
1290
1291 int
1292 main(int argc, char **cargv)
1293 {
1294 uschar **argv = USS cargv;
1295 int  arg_receive_timeout = -1;
1296 int  arg_smtp_receive_timeout = -1;
1297 int  arg_error_handling = error_handling;
1298 int  filter_sfd = -1;
1299 int  filter_ufd = -1;
1300 int  group_count;
1301 int  i;
1302 int  list_queue_option = 0;
1303 int  msg_action = 0;
1304 int  msg_action_arg = -1;
1305 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1306 int  queue_only_reason = 0;
1307 #ifdef EXIM_PERL
1308 int  perl_start_option = 0;
1309 #endif
1310 int  recipients_arg = argc;
1311 int  sender_address_domain = 0;
1312 int  test_retry_arg = -1;
1313 int  test_rewrite_arg = -1;
1314 BOOL arg_queue_only = FALSE;
1315 BOOL bi_option = FALSE;
1316 BOOL checking = FALSE;
1317 BOOL count_queue = FALSE;
1318 BOOL expansion_test = FALSE;
1319 BOOL extract_recipients = FALSE;
1320 BOOL forced_delivery = FALSE;
1321 BOOL f_end_dot = FALSE;
1322 BOOL deliver_give_up = FALSE;
1323 BOOL list_queue = FALSE;
1324 BOOL list_options = FALSE;
1325 BOOL local_queue_only;
1326 BOOL more = TRUE;
1327 BOOL one_msg_action = FALSE;
1328 BOOL queue_only_set = FALSE;
1329 BOOL receiving_message = TRUE;
1330 BOOL sender_ident_set = FALSE;
1331 BOOL session_local_queue_only;
1332 BOOL unprivileged;
1333 BOOL removed_privilege = FALSE;
1334 BOOL usage_wanted = FALSE;
1335 BOOL verify_address_mode = FALSE;
1336 BOOL verify_as_sender = FALSE;
1337 BOOL version_printed = FALSE;
1338 uschar *alias_arg = NULL;
1339 uschar *called_as = US"";
1340 uschar *start_queue_run_id = NULL;
1341 uschar *stop_queue_run_id = NULL;
1342 uschar *expansion_test_message = NULL;
1343 uschar *ftest_domain = NULL;
1344 uschar *ftest_localpart = NULL;
1345 uschar *ftest_prefix = NULL;
1346 uschar *ftest_suffix = NULL;
1347 uschar *real_sender_address;
1348 uschar *originator_home = US"/";
1349 void *reset_point;
1350
1351 struct passwd *pw;
1352 struct stat statbuf;
1353 pid_t passed_qr_pid = (pid_t)0;
1354 int passed_qr_pipe = -1;
1355 gid_t group_list[NGROUPS_MAX];
1356
1357 /* Possible options for -R and -S */
1358
1359 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1360
1361 /* Need to define this in case we need to change the environment in order
1362 to get rid of a bogus time zone. We have to make it char rather than uschar
1363 because some OS define it in /usr/include/unistd.h. */
1364
1365 extern char **environ;
1366
1367 /* If the Exim user and/or group and/or the configuration file owner/group were
1368 defined by ref:name at build time, we must now find the actual uid/gid values.
1369 This is a feature to make the lives of binary distributors easier. */
1370
1371 #ifdef EXIM_USERNAME
1372 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1373   {
1374   exim_gid = pw->pw_gid;
1375   }
1376 else
1377   {
1378   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1379     EXIM_USERNAME);
1380   exit(EXIT_FAILURE);
1381   }
1382 #endif
1383
1384 #ifdef EXIM_GROUPNAME
1385 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1386   {
1387   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1388     EXIM_GROUPNAME);
1389   exit(EXIT_FAILURE);
1390   }
1391 #endif
1392
1393 #ifdef CONFIGURE_OWNERNAME
1394 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1395   {
1396   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1397     CONFIGURE_OWNERNAME);
1398   exit(EXIT_FAILURE);
1399   }
1400 #endif
1401
1402 #ifdef CONFIGURE_GROUPNAME
1403 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1404   {
1405   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1406     CONFIGURE_GROUPNAME);
1407   exit(EXIT_FAILURE);
1408   }
1409 #endif
1410
1411 /* In the Cygwin environment, some initialization needs doing. It is fudged
1412 in by means of this macro. */
1413
1414 #ifdef OS_INIT
1415 OS_INIT
1416 #endif
1417
1418 /* Check a field which is patched when we are running Exim within its
1419 testing harness; do a fast initial check, and then the whole thing. */
1420
1421 running_in_test_harness =
1422   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1423
1424 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1425 at the start of a program; however, it seems that some environments do not
1426 follow this. A "strange" locale can affect the formatting of timestamps, so we
1427 make quite sure. */
1428
1429 setlocale(LC_ALL, "C");
1430
1431 /* Set up the default handler for timing using alarm(). */
1432
1433 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1434
1435 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1436 because store_malloc writes a log entry on failure. */
1437
1438 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1439 if (log_buffer == NULL)
1440   {
1441   fprintf(stderr, "exim: failed to get store for log buffer\n");
1442   exit(EXIT_FAILURE);
1443   }
1444
1445 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1446 NULL when the daemon is run and the file is closed. We have to use this
1447 indirection, because some systems don't allow writing to the variable "stderr".
1448 */
1449
1450 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1451
1452 /* Arrange for the PCRE regex library to use our store functions. Note that
1453 the normal calls are actually macros that add additional arguments for
1454 debugging purposes so we have to assign specially constructed functions here.
1455 The default is to use store in the stacking pool, but this is overridden in the
1456 regex_must_compile() function. */
1457
1458 pcre_malloc = function_store_get;
1459 pcre_free = function_dummy_free;
1460
1461 /* Ensure there is a big buffer for temporary use in several places. It is put
1462 in malloc store so that it can be freed for enlargement if necessary. */
1463
1464 big_buffer = store_malloc(big_buffer_size);
1465
1466 /* Set up the handler for the data request signal, and set the initial
1467 descriptive text. */
1468
1469 set_process_info("initializing");
1470 os_restarting_signal(SIGUSR1, usr1_handler);
1471
1472 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1473 in the daemon code. For the rest of Exim's uses, we ignore it. */
1474
1475 signal(SIGHUP, SIG_IGN);
1476
1477 /* We don't want to die on pipe errors as the code is written to handle
1478 the write error instead. */
1479
1480 signal(SIGPIPE, SIG_IGN);
1481
1482 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1483 set to SIG_IGN. This causes subprocesses that complete before the parent
1484 process waits for them not to hang around, so when Exim calls wait(), nothing
1485 is there. The wait() code has been made robust against this, but let's ensure
1486 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1487 ending status. We use sigaction rather than plain signal() on those OS where
1488 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1489 problem on AIX with this.) */
1490
1491 #ifdef SA_NOCLDWAIT
1492   {
1493   struct sigaction act;
1494   act.sa_handler = SIG_DFL;
1495   sigemptyset(&(act.sa_mask));
1496   act.sa_flags = 0;
1497   sigaction(SIGCHLD, &act, NULL);
1498   }
1499 #else
1500 signal(SIGCHLD, SIG_DFL);
1501 #endif
1502
1503 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1504 SIGHUP. */
1505
1506 sighup_argv = argv;
1507
1508 /* Set up the version number. Set up the leading 'E' for the external form of
1509 message ids, set the pointer to the internal form, and initialize it to
1510 indicate no message being processed. */
1511
1512 version_init();
1513 message_id_option[0] = '-';
1514 message_id_external = message_id_option + 1;
1515 message_id_external[0] = 'E';
1516 message_id = message_id_external + 1;
1517 message_id[0] = 0;
1518
1519 /* Set the umask to zero so that any files Exim creates using open() are
1520 created with the modes that it specifies. NOTE: Files created with fopen() have
1521 a problem, which was not recognized till rather late (February 2006). With this
1522 umask, such files will be world writeable. (They are all content scanning files
1523 in the spool directory, which isn't world-accessible, so this is not a
1524 disaster, but it's untidy.) I don't want to change this overall setting,
1525 however, because it will interact badly with the open() calls. Instead, there's
1526 now a function called modefopen() that fiddles with the umask while calling
1527 fopen(). */
1528
1529 (void)umask(0);
1530
1531 /* Precompile the regular expression for matching a message id. Keep this in
1532 step with the code that generates ids in the accept.c module. We need to do
1533 this here, because the -M options check their arguments for syntactic validity
1534 using mac_ismsgid, which uses this. */
1535
1536 regex_ismsgid =
1537   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1538
1539 /* Precompile the regular expression that is used for matching an SMTP error
1540 code, possibly extended, at the start of an error message. Note that the
1541 terminating whitespace character is included. */
1542
1543 regex_smtp_code =
1544   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1545     FALSE, TRUE);
1546
1547 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1548 this seems to be a generally accepted convention, since one finds symbolic
1549 links called "mailq" in standard OS configurations. */
1550
1551 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1552     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1553   {
1554   list_queue = TRUE;
1555   receiving_message = FALSE;
1556   called_as = US"-mailq";
1557   }
1558
1559 /* If the program is called as "rmail" treat it as equivalent to
1560 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1561 i.e. preventing a single dot on a line from terminating the message, and
1562 returning with zero return code, even in cases of error (provided an error
1563 message has been sent). */
1564
1565 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1566     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1567   {
1568   dot_ends = FALSE;
1569   called_as = US"-rmail";
1570   errors_sender_rc = EXIT_SUCCESS;
1571   }
1572
1573 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1574 this is a smail convention. */
1575
1576 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1577     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1578   {
1579   smtp_input = smtp_batched_input = TRUE;
1580   called_as = US"-rsmtp";
1581   }
1582
1583 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1584 this is a smail convention. */
1585
1586 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1587     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1588   {
1589   queue_interval = 0;
1590   receiving_message = FALSE;
1591   called_as = US"-runq";
1592   }
1593
1594 /* If the program is called as "newaliases" treat it as equivalent to
1595 "exim -bi"; this is a sendmail convention. */
1596
1597 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1598     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1599   {
1600   bi_option = TRUE;
1601   receiving_message = FALSE;
1602   called_as = US"-newaliases";
1603   }
1604
1605 /* Save the original effective uid for a couple of uses later. It should
1606 normally be root, but in some esoteric environments it may not be. */
1607
1608 original_euid = geteuid();
1609
1610 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1611 to be the same as the real ones. This makes a difference only if Exim is setuid
1612 (or setgid) to something other than root, which could be the case in some
1613 special configurations. */
1614
1615 real_uid = getuid();
1616 real_gid = getgid();
1617
1618 if (real_uid == root_uid)
1619   {
1620   setgid(real_gid);
1621   setuid(real_uid);
1622   }
1623
1624 /* If neither the original real uid nor the original euid was root, Exim is
1625 running in an unprivileged state. */
1626
1627 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1628
1629 /* If the first argument is --help, set usage_wanted and pretend there
1630 are no arguments. This will cause a brief message to be given.   We do
1631 the message generation downstream so we can pick up how we were invoked */
1632
1633 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0)
1634   {
1635   argc = 1;
1636   usage_wanted = TRUE;
1637   }
1638
1639 /* Scan the program's arguments. Some can be dealt with right away; others are
1640 simply recorded for checking and handling afterwards. Do a high-level switch
1641 on the second character (the one after '-'), to save some effort. */
1642
1643 for (i = 1; i < argc; i++)
1644   {
1645   BOOL badarg = FALSE;
1646   uschar *arg = argv[i];
1647   uschar *argrest;
1648   int switchchar;
1649
1650   /* An argument not starting with '-' is the start of a recipients list;
1651   break out of the options-scanning loop. */
1652
1653   if (arg[0] != '-')
1654     {
1655     recipients_arg = i;
1656     break;
1657     }
1658
1659   /* An option consistion of -- terminates the options */
1660
1661   if (Ustrcmp(arg, "--") == 0)
1662     {
1663     recipients_arg = i + 1;
1664     break;
1665     }
1666
1667   /* Handle flagged options */
1668
1669   switchchar = arg[1];
1670   argrest = arg+2;
1671
1672   /* Make all -ex options synonymous with -oex arguments, since that
1673   is assumed by various callers. Also make -qR options synonymous with -R
1674   options, as that seems to be required as well. Allow for -qqR too, and
1675   the same for -S options. */
1676
1677   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1678       Ustrncmp(arg+1, "qR", 2) == 0 ||
1679       Ustrncmp(arg+1, "qS", 2) == 0)
1680     {
1681     switchchar = arg[2];
1682     argrest++;
1683     }
1684   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1685     {
1686     switchchar = arg[3];
1687     argrest += 2;
1688     queue_2stage = TRUE;
1689     }
1690
1691   /* Make -r synonymous with -f, since it is a documented alias */
1692
1693   else if (arg[1] == 'r') switchchar = 'f';
1694
1695   /* Make -ov synonymous with -v */
1696
1697   else if (Ustrcmp(arg, "-ov") == 0)
1698     {
1699     switchchar = 'v';
1700     argrest++;
1701     }
1702
1703   /* High-level switch on active initial letter */
1704
1705   switch(switchchar)
1706     {
1707     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1708     so has no need of it. */
1709
1710     case 'B':
1711     if (*argrest == 0) i++;       /* Skip over the type */
1712     break;
1713
1714
1715     case 'b':
1716     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1717
1718     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1719        -bdf: Ditto, but in the foreground.
1720     */
1721
1722     if (*argrest == 'd')
1723       {
1724       daemon_listen = TRUE;
1725       if (*(++argrest) == 'f') background_daemon = FALSE;
1726         else if (*argrest != 0) { badarg = TRUE; break; }
1727       }
1728
1729     /* -be:  Run in expansion test mode
1730        -bem: Ditto, but read a message from a file first
1731     */
1732
1733     else if (*argrest == 'e')
1734       {
1735       expansion_test = checking = TRUE;
1736       if (argrest[1] == 'm')
1737         {
1738         if (++i >= argc) { badarg = TRUE; break; }
1739         expansion_test_message = argv[i];
1740         argrest++;
1741         }
1742       if (argrest[1] != 0) { badarg = TRUE; break; }
1743       }
1744
1745     /* -bF:  Run system filter test */
1746
1747     else if (*argrest == 'F')
1748       {
1749       filter_test |= FTEST_SYSTEM;
1750       if (*(++argrest) != 0) { badarg = TRUE; break; }
1751       if (++i < argc) filter_test_sfile = argv[i]; else
1752         {
1753         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1754         exit(EXIT_FAILURE);
1755         }
1756       }
1757
1758     /* -bf:  Run user filter test
1759        -bfd: Set domain for filter testing
1760        -bfl: Set local part for filter testing
1761        -bfp: Set prefix for filter testing
1762        -bfs: Set suffix for filter testing
1763     */
1764
1765     else if (*argrest == 'f')
1766       {
1767       if (*(++argrest) == 0)
1768         {
1769         filter_test |= FTEST_USER;
1770         if (++i < argc) filter_test_ufile = argv[i]; else
1771           {
1772           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1773           exit(EXIT_FAILURE);
1774           }
1775         }
1776       else
1777         {
1778         if (++i >= argc)
1779           {
1780           fprintf(stderr, "exim: string expected after %s\n", arg);
1781           exit(EXIT_FAILURE);
1782           }
1783         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1784         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1785         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1786         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1787         else { badarg = TRUE; break; }
1788         }
1789       }
1790
1791     /* -bh: Host checking - an IP address must follow. */
1792
1793     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1794       {
1795       if (++i >= argc) { badarg = TRUE; break; }
1796       sender_host_address = argv[i];
1797       host_checking = checking = log_testing_mode = TRUE;
1798       host_checking_callout = argrest[1] == 'c';
1799       }
1800
1801     /* -bi: This option is used by sendmail to initialize *the* alias file,
1802     though it has the -oA option to specify a different file. Exim has no
1803     concept of *the* alias file, but since Sun's YP make script calls
1804     sendmail this way, some support must be provided. */
1805
1806     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1807
1808     /* -bm: Accept and deliver message - the default option. Reinstate
1809     receiving_message, which got turned off for all -b options. */
1810
1811     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1812
1813     /* -bnq: For locally originating messages, do not qualify unqualified
1814     addresses. In the envelope, this causes errors; in header lines they
1815     just get left. */
1816
1817     else if (Ustrcmp(argrest, "nq") == 0)
1818       {
1819       allow_unqualified_sender = FALSE;
1820       allow_unqualified_recipient = FALSE;
1821       }
1822
1823     /* -bpxx: List the contents of the mail queue, in various forms. If
1824     the option is -bpc, just a queue count is needed. Otherwise, if the
1825     first letter after p is r, then order is random. */
1826
1827     else if (*argrest == 'p')
1828       {
1829       if (*(++argrest) == 'c')
1830         {
1831         count_queue = TRUE;
1832         if (*(++argrest) != 0) badarg = TRUE;
1833         break;
1834         }
1835
1836       if (*argrest == 'r')
1837         {
1838         list_queue_option = 8;
1839         argrest++;
1840         }
1841       else list_queue_option = 0;
1842
1843       list_queue = TRUE;
1844
1845       /* -bp: List the contents of the mail queue, top-level only */
1846
1847       if (*argrest == 0) {}
1848
1849       /* -bpu: List the contents of the mail queue, top-level undelivered */
1850
1851       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1852
1853       /* -bpa: List the contents of the mail queue, including all delivered */
1854
1855       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1856
1857       /* Unknown after -bp[r] */
1858
1859       else
1860         {
1861         badarg = TRUE;
1862         break;
1863         }
1864       }
1865
1866
1867     /* -bP: List the configuration variables given as the address list.
1868     Force -v, so configuration errors get displayed. */
1869
1870     else if (Ustrcmp(argrest, "P") == 0)
1871       {
1872       list_options = TRUE;
1873       debug_selector |= D_v;
1874       debug_file = stderr;
1875       }
1876
1877     /* -brt: Test retry configuration lookup */
1878
1879     else if (Ustrcmp(argrest, "rt") == 0)
1880       {
1881       test_retry_arg = i + 1;
1882       goto END_ARG;
1883       }
1884
1885     /* -brw: Test rewrite configuration */
1886
1887     else if (Ustrcmp(argrest, "rw") == 0)
1888       {
1889       test_rewrite_arg = i + 1;
1890       goto END_ARG;
1891       }
1892
1893     /* -bS: Read SMTP commands on standard input, but produce no replies -
1894     all errors are reported by sending messages. */
1895
1896     else if (Ustrcmp(argrest, "S") == 0)
1897       smtp_input = smtp_batched_input = receiving_message = TRUE;
1898
1899     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1900     on standard output. */
1901
1902     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1903
1904     /* -bt: address testing mode */
1905
1906     else if (Ustrcmp(argrest, "t") == 0)
1907       address_test_mode = checking = log_testing_mode = TRUE;
1908
1909     /* -bv: verify addresses */
1910
1911     else if (Ustrcmp(argrest, "v") == 0)
1912       verify_address_mode = checking = log_testing_mode = TRUE;
1913
1914     /* -bvs: verify sender addresses */
1915
1916     else if (Ustrcmp(argrest, "vs") == 0)
1917       {
1918       verify_address_mode = checking = log_testing_mode = TRUE;
1919       verify_as_sender = TRUE;
1920       }
1921
1922     /* -bV: Print version string and support details */
1923
1924     else if (Ustrcmp(argrest, "V") == 0)
1925       {
1926       printf("Exim version %s #%s built %s\n", version_string,
1927         version_cnumber, version_date);
1928       printf("%s\n", CS version_copyright);
1929       version_printed = TRUE;
1930       show_whats_supported(stdout);
1931       }
1932
1933     else badarg = TRUE;
1934     break;
1935
1936
1937     /* -C: change configuration file list; ignore if it isn't really
1938     a change! Enforce a prefix check if required. */
1939
1940     case 'C':
1941     if (*argrest == 0)
1942       {
1943       if(++i < argc) argrest = argv[i]; else
1944         { badarg = TRUE; break; }
1945       }
1946     if (Ustrcmp(config_main_filelist, argrest) != 0)
1947       {
1948       #ifdef ALT_CONFIG_PREFIX
1949       int sep = 0;
1950       int len = Ustrlen(ALT_CONFIG_PREFIX);
1951       uschar *list = argrest;
1952       uschar *filename;
1953       while((filename = string_nextinlist(&list, &sep, big_buffer,
1954              big_buffer_size)) != NULL)
1955         {
1956         if ((Ustrlen(filename) < len ||
1957              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1958              Ustrstr(filename, "/../") != NULL) &&
1959              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1960           {
1961           fprintf(stderr, "-C Permission denied\n");
1962           exit(EXIT_FAILURE);
1963           }
1964         }
1965       #endif
1966
1967       config_main_filelist = argrest;
1968       config_changed = TRUE;
1969       }
1970     break;
1971
1972
1973     /* -D: set up a macro definition */
1974
1975     case 'D':
1976     #ifdef DISABLE_D_OPTION
1977     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1978     exit(EXIT_FAILURE);
1979     #else
1980       {
1981       int ptr = 0;
1982       macro_item *mlast = NULL;
1983       macro_item *m;
1984       uschar name[24];
1985       uschar *s = argrest;
1986
1987       while (isspace(*s)) s++;
1988
1989       if (*s < 'A' || *s > 'Z')
1990         {
1991         fprintf(stderr, "exim: macro name set by -D must start with "
1992           "an upper case letter\n");
1993         exit(EXIT_FAILURE);
1994         }
1995
1996       while (isalnum(*s) || *s == '_')
1997         {
1998         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1999         s++;
2000         }
2001       name[ptr] = 0;
2002       if (ptr == 0) { badarg = TRUE; break; }
2003       while (isspace(*s)) s++;
2004       if (*s != 0)
2005         {
2006         if (*s++ != '=') { badarg = TRUE; break; }
2007         while (isspace(*s)) s++;
2008         }
2009
2010       for (m = macros; m != NULL; m = m->next)
2011         {
2012         if (Ustrcmp(m->name, name) == 0)
2013           {
2014           fprintf(stderr, "exim: duplicated -D in command line\n");
2015           exit(EXIT_FAILURE);
2016           }
2017         mlast = m;
2018         }
2019
2020       m = store_get(sizeof(macro_item) + Ustrlen(name));
2021       m->next = NULL;
2022       m->command_line = TRUE;
2023       if (mlast == NULL) macros = m; else mlast->next = m;
2024       Ustrcpy(m->name, name);
2025       m->replacement = string_copy(s);
2026
2027       if (clmacro_count >= MAX_CLMACROS)
2028         {
2029         fprintf(stderr, "exim: too many -D options on command line\n");
2030         exit(EXIT_FAILURE);
2031         }
2032       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2033         m->replacement);
2034       }
2035     #endif
2036     break;
2037
2038     /* -d: Set debug level (see also -v below) or set the drop_cr option.
2039     The latter is now a no-op, retained for compatibility only. If -dd is used,
2040     debugging subprocesses of the daemon is disabled. */
2041
2042     case 'd':
2043     if (Ustrcmp(argrest, "ropcr") == 0)
2044       {
2045       /* drop_cr = TRUE; */
2046       }
2047
2048     /* Use an intermediate variable so that we don't set debugging while
2049     decoding the debugging bits. */
2050
2051     else
2052       {
2053       unsigned int selector = D_default;
2054       debug_selector = 0;
2055       debug_file = NULL;
2056       if (*argrest == 'd')
2057         {
2058         debug_daemon = TRUE;
2059         argrest++;
2060         }
2061       if (*argrest != 0)
2062         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2063           debug_options_count, US"debug");
2064       debug_selector = selector;
2065       }
2066     break;
2067
2068
2069     /* -E: This is a local error message. This option is not intended for
2070     external use at all, but is not restricted to trusted callers because it
2071     does no harm (just suppresses certain error messages) and if Exim is run
2072     not setuid root it won't always be trusted when it generates error
2073     messages using this option. If there is a message id following -E, point
2074     message_reference at it, for logging. */
2075
2076     case 'E':
2077     local_error_message = TRUE;
2078     if (mac_ismsgid(argrest)) message_reference = argrest;
2079     break;
2080
2081
2082     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2083     option, so it looks as if historically the -oex options are also callable
2084     without the leading -o. So we have to accept them. Before the switch,
2085     anything starting -oe has been converted to -e. Exim does not support all
2086     of the sendmail error options. */
2087
2088     case 'e':
2089     if (Ustrcmp(argrest, "e") == 0)
2090       {
2091       arg_error_handling = ERRORS_SENDER;
2092       errors_sender_rc = EXIT_SUCCESS;
2093       }
2094     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2095     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2096     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2097     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2098     else badarg = TRUE;
2099     break;
2100
2101
2102     /* -F: Set sender's full name, used instead of the gecos entry from
2103     the password file. Since users can usually alter their gecos entries,
2104     there's no security involved in using this instead. The data can follow
2105     the -F or be in the next argument. */
2106
2107     case 'F':
2108     if (*argrest == 0)
2109       {
2110       if(++i < argc) argrest = argv[i]; else
2111         { badarg = TRUE; break; }
2112       }
2113     originator_name = argrest;
2114     sender_name_forced = TRUE;
2115     break;
2116
2117
2118     /* -f: Set sender's address - this value is only actually used if Exim is
2119     run by a trusted user, or if untrusted_set_sender is set and matches the
2120     address, except that the null address can always be set by any user. The
2121     test for this happens later, when the value given here is ignored when not
2122     permitted. For an untrusted user, the actual sender is still put in Sender:
2123     if it doesn't match the From: header (unless no_local_from_check is set).
2124     The data can follow the -f or be in the next argument. The -r switch is an
2125     obsolete form of -f but since there appear to be programs out there that
2126     use anything that sendmail has ever supported, better accept it - the
2127     synonymizing is done before the switch above.
2128
2129     At this stage, we must allow domain literal addresses, because we don't
2130     know what the setting of allow_domain_literals is yet. Ditto for trailing
2131     dots and strip_trailing_dot. */
2132
2133     case 'f':
2134       {
2135       int start, end;
2136       uschar *errmess;
2137       if (*argrest == 0)
2138         {
2139         if (i+1 < argc) argrest = argv[++i]; else
2140           { badarg = TRUE; break; }
2141         }
2142       if (*argrest == 0)
2143         {
2144         sender_address = string_sprintf("");  /* Ensure writeable memory */
2145         }
2146       else
2147         {
2148         uschar *temp = argrest + Ustrlen(argrest) - 1;
2149         while (temp >= argrest && isspace(*temp)) temp--;
2150         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2151         allow_domain_literals = TRUE;
2152         strip_trailing_dot = TRUE;
2153         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2154           &sender_address_domain, TRUE);
2155         allow_domain_literals = FALSE;
2156         strip_trailing_dot = FALSE;
2157         if (sender_address == NULL)
2158           {
2159           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2160           return EXIT_FAILURE;
2161           }
2162         }
2163       sender_address_forced = TRUE;
2164       }
2165     break;
2166
2167     /* This is some Sendmail thing which can be ignored */
2168
2169     case 'G':
2170     break;
2171
2172     /* -h: Set the hop count for an incoming message. Exim does not currently
2173     support this; it always computes it by counting the Received: headers.
2174     To put it in will require a change to the spool header file format. */
2175
2176     case 'h':
2177     if (*argrest == 0)
2178       {
2179       if(++i < argc) argrest = argv[i]; else
2180         { badarg = TRUE; break; }
2181       }
2182     if (!isdigit(*argrest)) badarg = TRUE;
2183     break;
2184
2185
2186     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2187     not to be documented for sendmail but mailx (at least) uses it) */
2188
2189     case 'i':
2190     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2191     break;
2192
2193
2194     case 'M':
2195     receiving_message = FALSE;
2196
2197     /* -MC:  continue delivery of another message via an existing open
2198     file descriptor. This option is used for an internal call by the
2199     smtp transport when there is a pending message waiting to go to an
2200     address to which it has got a connection. Five subsequent arguments are
2201     required: transport name, host name, IP address, sequence number, and
2202     message_id. Transports may decline to create new processes if the sequence
2203     number gets too big. The channel is stdin. This (-MC) must be the last
2204     argument. There's a subsequent check that the real-uid is privileged.
2205
2206     If we are running in the test harness. delay for a bit, to let the process
2207     that set this one up complete. This makes for repeatability of the logging,
2208     etc. output. */
2209
2210     if (Ustrcmp(argrest, "C") == 0)
2211       {
2212       union sockaddr_46 interface_sock;
2213       EXIM_SOCKLEN_T size = sizeof(interface_sock);
2214
2215       if (argc != i + 6)
2216         {
2217         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2218         return EXIT_FAILURE;
2219         }
2220
2221       if (msg_action_arg >= 0)
2222         {
2223         fprintf(stderr, "exim: incompatible arguments\n");
2224         return EXIT_FAILURE;
2225         }
2226
2227       continue_transport = argv[++i];
2228       continue_hostname = argv[++i];
2229       continue_host_address = argv[++i];
2230       continue_sequence = Uatoi(argv[++i]);
2231       msg_action = MSG_DELIVER;
2232       msg_action_arg = ++i;
2233       forced_delivery = TRUE;
2234       queue_run_pid = passed_qr_pid;
2235       queue_run_pipe = passed_qr_pipe;
2236
2237       if (!mac_ismsgid(argv[i]))
2238         {
2239         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2240           argv[i]);
2241         return EXIT_FAILURE;
2242         }
2243
2244       /* Set up $sending_ip_address and $sending_port */
2245
2246       if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2247           &size) == 0)
2248         sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2249           &sending_port);
2250       else
2251         {
2252         fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2253           strerror(errno));
2254         return EXIT_FAILURE;
2255         }
2256
2257       if (running_in_test_harness) millisleep(500);
2258       break;
2259       }
2260
2261     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2262     precedes -MC (see above). The flag indicates that the host to which
2263     Exim is connected has accepted an AUTH sequence. */
2264
2265     else if (Ustrcmp(argrest, "CA") == 0)
2266       {
2267       smtp_authenticated = TRUE;
2268       break;
2269       }
2270
2271     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2272     it preceded -MC (see above) */
2273
2274     else if (Ustrcmp(argrest, "CP") == 0)
2275       {
2276       smtp_use_pipelining = TRUE;
2277       break;
2278       }
2279
2280     /* -MCQ: pass on the pid of the queue-running process that started
2281     this chain of deliveries and the fd of its synchronizing pipe; this
2282     is useful only when it precedes -MC (see above) */
2283
2284     else if (Ustrcmp(argrest, "CQ") == 0)
2285       {
2286       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2287         else badarg = TRUE;
2288       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2289         else badarg = TRUE;
2290       break;
2291       }
2292
2293     /* -MCS: set the smtp_use_size flag; this is useful only when it
2294     precedes -MC (see above) */
2295
2296     else if (Ustrcmp(argrest, "CS") == 0)
2297       {
2298       smtp_use_size = TRUE;
2299       break;
2300       }
2301
2302     /* -MCT: set the tls_offered flag; this is useful only when it
2303     precedes -MC (see above). The flag indicates that the host to which
2304     Exim is connected has offered TLS support. */
2305
2306     #ifdef SUPPORT_TLS
2307     else if (Ustrcmp(argrest, "CT") == 0)
2308       {
2309       tls_offered = TRUE;
2310       break;
2311       }
2312     #endif
2313
2314     /* -M[x]: various operations on the following list of message ids:
2315        -M    deliver the messages, ignoring next retry times and thawing
2316        -Mc   deliver the messages, checking next retry times, no thawing
2317        -Mf   freeze the messages
2318        -Mg   give up on the messages
2319        -Mt   thaw the messages
2320        -Mrm  remove the messages
2321     In the above cases, this must be the last option. There are also the
2322     following options which are followed by a single message id, and which
2323     act on that message. Some of them use the "recipient" addresses as well.
2324        -Mar  add recipient(s)
2325        -Mmad mark all recipients delivered
2326        -Mmd  mark recipients(s) delivered
2327        -Mes  edit sender
2328        -Mset load a message for use with -be
2329        -Mvb  show body
2330        -Mvc  show copy (of whole message, in RFC 2822 format)
2331        -Mvh  show header
2332        -Mvl  show log
2333     */
2334
2335     else if (*argrest == 0)
2336       {
2337       msg_action = MSG_DELIVER;
2338       forced_delivery = deliver_force_thaw = TRUE;
2339       }
2340     else if (Ustrcmp(argrest, "ar") == 0)
2341       {
2342       msg_action = MSG_ADD_RECIPIENT;
2343       one_msg_action = TRUE;
2344       }
2345     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2346     else if (Ustrcmp(argrest, "es") == 0)
2347       {
2348       msg_action = MSG_EDIT_SENDER;
2349       one_msg_action = TRUE;
2350       }
2351     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2352     else if (Ustrcmp(argrest, "g") == 0)
2353       {
2354       msg_action = MSG_DELIVER;
2355       deliver_give_up = TRUE;
2356       }
2357     else if (Ustrcmp(argrest, "mad") == 0)
2358       {
2359       msg_action = MSG_MARK_ALL_DELIVERED;
2360       }
2361     else if (Ustrcmp(argrest, "md") == 0)
2362       {
2363       msg_action = MSG_MARK_DELIVERED;
2364       one_msg_action = TRUE;
2365       }
2366     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2367     else if (Ustrcmp(argrest, "set") == 0)
2368       {
2369       msg_action = MSG_LOAD;
2370       one_msg_action = TRUE;
2371       }
2372     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2373     else if (Ustrcmp(argrest, "vb") == 0)
2374       {
2375       msg_action = MSG_SHOW_BODY;
2376       one_msg_action = TRUE;
2377       }
2378     else if (Ustrcmp(argrest, "vc") == 0)
2379       {
2380       msg_action = MSG_SHOW_COPY;
2381       one_msg_action = TRUE;
2382       }
2383     else if (Ustrcmp(argrest, "vh") == 0)
2384       {
2385       msg_action = MSG_SHOW_HEADER;
2386       one_msg_action = TRUE;
2387       }
2388     else if (Ustrcmp(argrest, "vl") == 0)
2389       {
2390       msg_action = MSG_SHOW_LOG;
2391       one_msg_action = TRUE;
2392       }
2393     else { badarg = TRUE; break; }
2394
2395     /* All the -Mxx options require at least one message id. */
2396
2397     msg_action_arg = i + 1;
2398     if (msg_action_arg >= argc)
2399       {
2400       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2401       return EXIT_FAILURE;
2402       }
2403
2404     /* Some require only message ids to follow */
2405
2406     if (!one_msg_action)
2407       {
2408       int j;
2409       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2410         {
2411         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2412           argv[j], arg);
2413         return EXIT_FAILURE;
2414         }
2415       goto END_ARG;   /* Remaining args are ids */
2416       }
2417
2418     /* Others require only one message id, possibly followed by addresses,
2419     which will be handled as normal arguments. */
2420
2421     else
2422       {
2423       if (!mac_ismsgid(argv[msg_action_arg]))
2424         {
2425         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2426           argv[msg_action_arg], arg);
2427         return EXIT_FAILURE;
2428         }
2429       i++;
2430       }
2431     break;
2432
2433
2434     /* Some programs seem to call the -om option without the leading o;
2435     for sendmail it askes for "me too". Exim always does this. */
2436
2437     case 'm':
2438     if (*argrest != 0) badarg = TRUE;
2439     break;
2440
2441
2442     /* -N: don't do delivery - a debugging option that stops transports doing
2443     their thing. It implies debugging at the D_v level. */
2444
2445     case 'N':
2446     if (*argrest == 0)
2447       {
2448       dont_deliver = TRUE;
2449       debug_selector |= D_v;
2450       debug_file = stderr;
2451       }
2452     else badarg = TRUE;
2453     break;
2454
2455
2456     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2457     it. */
2458
2459     case 'n':
2460     break;
2461
2462     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2463     option to the specified value. This form uses long names. We need to handle
2464     -O option=value and -Ooption=value. */
2465
2466     case 'O':
2467     if (*argrest == 0)
2468       {
2469       if (++i >= argc)
2470         {
2471         fprintf(stderr, "exim: string expected after -O\n");
2472         exit(EXIT_FAILURE);
2473         }
2474       }
2475     break;
2476
2477     case 'o':
2478
2479     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2480     file" option). */
2481
2482     if (*argrest == 'A')
2483       {
2484       alias_arg = argrest + 1;
2485       if (alias_arg[0] == 0)
2486         {
2487         if (i+1 < argc) alias_arg = argv[++i]; else
2488           {
2489           fprintf(stderr, "exim: string expected after -oA\n");
2490           exit(EXIT_FAILURE);
2491           }
2492         }
2493       }
2494
2495     /* -oB: Set a connection message max value for remote deliveries */
2496
2497     else if (*argrest == 'B')
2498       {
2499       uschar *p = argrest + 1;
2500       if (p[0] == 0)
2501         {
2502         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2503           {
2504           connection_max_messages = 1;
2505           p = NULL;
2506           }
2507         }
2508
2509       if (p != NULL)
2510         {
2511         if (!isdigit(*p))
2512           {
2513           fprintf(stderr, "exim: number expected after -oB\n");
2514           exit(EXIT_FAILURE);
2515           }
2516         connection_max_messages = Uatoi(p);
2517         }
2518       }
2519
2520     /* -odb: background delivery */
2521
2522     else if (Ustrcmp(argrest, "db") == 0)
2523       {
2524       synchronous_delivery = FALSE;
2525       arg_queue_only = FALSE;
2526       queue_only_set = TRUE;
2527       }
2528
2529     /* -odf: foreground delivery (smail-compatible option); same effect as
2530        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2531     */
2532
2533     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2534       {
2535       synchronous_delivery = TRUE;
2536       arg_queue_only = FALSE;
2537       queue_only_set = TRUE;
2538       }
2539
2540     /* -odq: queue only */
2541
2542     else if (Ustrcmp(argrest, "dq") == 0)
2543       {
2544       synchronous_delivery = FALSE;
2545       arg_queue_only = TRUE;
2546       queue_only_set = TRUE;
2547       }
2548
2549     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2550     but no remote delivery */
2551
2552     else if (Ustrcmp(argrest, "dqs") == 0)
2553       {
2554       queue_smtp = TRUE;
2555       arg_queue_only = FALSE;
2556       queue_only_set = TRUE;
2557       }
2558
2559     /* -oex: Sendmail error flags. As these are also accepted without the
2560     leading -o prefix, for compatibility with vacation and other callers,
2561     they are handled with -e above. */
2562
2563     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2564        -oitrue: Another sendmail syntax for the same */
2565
2566     else if (Ustrcmp(argrest, "i") == 0 ||
2567              Ustrcmp(argrest, "itrue") == 0)
2568       dot_ends = FALSE;
2569
2570     /* -oM*: Set various characteristics for an incoming message; actually
2571     acted on for trusted callers only. */
2572
2573     else if (*argrest == 'M')
2574       {
2575       if (i+1 >= argc)
2576         {
2577         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2578         exit(EXIT_FAILURE);
2579         }
2580
2581       /* -oMa: Set sender host address */
2582
2583       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2584
2585       /* -oMaa: Set authenticator name */
2586
2587       else if (Ustrcmp(argrest, "Maa") == 0)
2588         sender_host_authenticated = argv[++i];
2589
2590       /* -oMas: setting authenticated sender */
2591
2592       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2593
2594       /* -oMai: setting authenticated id */
2595
2596       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2597
2598       /* -oMi: Set incoming interface address */
2599
2600       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2601
2602       /* -oMr: Received protocol */
2603
2604       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2605
2606       /* -oMs: Set sender host name */
2607
2608       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2609
2610       /* -oMt: Set sender ident */
2611
2612       else if (Ustrcmp(argrest, "Mt") == 0)
2613         {
2614         sender_ident_set = TRUE;
2615         sender_ident = argv[++i];
2616         }
2617
2618       /* Else a bad argument */
2619
2620       else
2621         {
2622         badarg = TRUE;
2623         break;
2624         }
2625       }
2626
2627     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2628     seem to call this as -m (undocumented), so that is also accepted (see
2629     above). */
2630
2631     else if (Ustrcmp(argrest, "m") == 0) {}
2632
2633     /* -oo: An ancient flag for old-style addresses which still seems to
2634     crop up in some calls (see in SCO). */
2635
2636     else if (Ustrcmp(argrest, "o") == 0) {}
2637
2638     /* -oP <name>: set pid file path for daemon */
2639
2640     else if (Ustrcmp(argrest, "P") == 0)
2641       override_pid_file_path = argv[++i];
2642
2643     /* -or <n>: set timeout for non-SMTP acceptance
2644        -os <n>: set timeout for SMTP acceptance */
2645
2646     else if (*argrest == 'r' || *argrest == 's')
2647       {
2648       int *tp = (*argrest == 'r')?
2649         &arg_receive_timeout : &arg_smtp_receive_timeout;
2650       if (argrest[1] == 0)
2651         {
2652         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2653         }
2654       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2655       if (*tp < 0)
2656         {
2657         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2658         exit(EXIT_FAILURE);
2659         }
2660       }
2661
2662     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2663
2664     else if (Ustrcmp(argrest, "X") == 0)
2665       override_local_interfaces = argv[++i];
2666
2667     /* Unknown -o argument */
2668
2669     else badarg = TRUE;
2670     break;
2671
2672
2673     /* -ps: force Perl startup; -pd force delayed Perl startup */
2674
2675     case 'p':
2676     #ifdef EXIM_PERL
2677     if (*argrest == 's' && argrest[1] == 0)
2678       {
2679       perl_start_option = 1;
2680       break;
2681       }
2682     if (*argrest == 'd' && argrest[1] == 0)
2683       {
2684       perl_start_option = -1;
2685       break;
2686       }
2687     #endif
2688
2689     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2690     which sets the host protocol and host name */
2691
2692     if (*argrest == 0)
2693       {
2694       if (i+1 < argc) argrest = argv[++i]; else
2695         { badarg = TRUE; break; }
2696       }
2697
2698     if (*argrest != 0)
2699       {
2700       uschar *hn = Ustrchr(argrest, ':');
2701       if (hn == NULL)
2702         {
2703         received_protocol = argrest;
2704         }
2705       else
2706         {
2707         received_protocol = string_copyn(argrest, hn - argrest);
2708         sender_host_name = hn + 1;
2709         }
2710       }
2711     break;
2712
2713
2714     case 'q':
2715     receiving_message = FALSE;
2716     if (queue_interval >= 0)
2717       {
2718       fprintf(stderr, "exim: -q specified more than once\n");
2719       exit(EXIT_FAILURE);
2720       }
2721
2722     /* -qq...: Do queue runs in a 2-stage manner */
2723
2724     if (*argrest == 'q')
2725       {
2726       queue_2stage = TRUE;
2727       argrest++;
2728       }
2729
2730     /* -qi...: Do only first (initial) deliveries */
2731
2732     if (*argrest == 'i')
2733       {
2734       queue_run_first_delivery = TRUE;
2735       argrest++;
2736       }
2737
2738     /* -qf...: Run the queue, forcing deliveries
2739        -qff..: Ditto, forcing thawing as well */
2740
2741     if (*argrest == 'f')
2742       {
2743       queue_run_force = TRUE;
2744       if (*(++argrest) == 'f')
2745         {
2746         deliver_force_thaw = TRUE;
2747         argrest++;
2748         }
2749       }
2750
2751     /* -q[f][f]l...: Run the queue only on local deliveries */
2752
2753     if (*argrest == 'l')
2754       {
2755       queue_run_local = TRUE;
2756       argrest++;
2757       }
2758
2759     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2760     optionally starting from a given message id. */
2761
2762     if (*argrest == 0 &&
2763         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2764       {
2765       queue_interval = 0;
2766       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2767         start_queue_run_id = argv[++i];
2768       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2769         stop_queue_run_id = argv[++i];
2770       }
2771
2772     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2773     optionally local only. */
2774
2775     else
2776       {
2777       if (*argrest != 0)
2778         queue_interval = readconf_readtime(argrest, 0, FALSE);
2779       else
2780         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2781       if (queue_interval <= 0)
2782         {
2783         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2784         exit(EXIT_FAILURE);
2785         }
2786       }
2787     break;
2788
2789
2790     case 'R':   /* Synonymous with -qR... */
2791     receiving_message = FALSE;
2792
2793     /* -Rf:   As -R (below) but force all deliveries,
2794        -Rff:  Ditto, but also thaw all frozen messages,
2795        -Rr:   String is regex
2796        -Rrf:  Regex and force
2797        -Rrff: Regex and force and thaw
2798
2799     in all cases provided there are no further characters in this
2800     argument. */
2801
2802     if (*argrest != 0)
2803       {
2804       int i;
2805       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2806         {
2807         if (Ustrcmp(argrest, rsopts[i]) == 0)
2808           {
2809           if (i != 2) queue_run_force = TRUE;
2810           if (i >= 2) deliver_selectstring_regex = TRUE;
2811           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2812           argrest += Ustrlen(rsopts[i]);
2813           }
2814         }
2815       }
2816
2817     /* -R: Set string to match in addresses for forced queue run to
2818     pick out particular messages. */
2819
2820     if (*argrest == 0)
2821       {
2822       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2823         {
2824         fprintf(stderr, "exim: string expected after -R\n");
2825         exit(EXIT_FAILURE);
2826         }
2827       }
2828     else deliver_selectstring = argrest;
2829     break;
2830
2831
2832     /* -r: an obsolete synonym for -f (see above) */
2833
2834
2835     /* -S: Like -R but works on sender. */
2836
2837     case 'S':   /* Synonymous with -qS... */
2838     receiving_message = FALSE;
2839
2840     /* -Sf:   As -S (below) but force all deliveries,
2841        -Sff:  Ditto, but also thaw all frozen messages,
2842        -Sr:   String is regex
2843        -Srf:  Regex and force
2844        -Srff: Regex and force and thaw
2845
2846     in all cases provided there are no further characters in this
2847     argument. */
2848
2849     if (*argrest != 0)
2850       {
2851       int i;
2852       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2853         {
2854         if (Ustrcmp(argrest, rsopts[i]) == 0)
2855           {
2856           if (i != 2) queue_run_force = TRUE;
2857           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2858           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2859           argrest += Ustrlen(rsopts[i]);
2860           }
2861         }
2862       }
2863
2864     /* -S: Set string to match in addresses for forced queue run to
2865     pick out particular messages. */
2866
2867     if (*argrest == 0)
2868       {
2869       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2870         {
2871         fprintf(stderr, "exim: string expected after -S\n");
2872         exit(EXIT_FAILURE);
2873         }
2874       }
2875     else deliver_selectstring_sender = argrest;
2876     break;
2877
2878     /* -Tqt is an option that is exclusively for use by the testing suite.
2879     It is not recognized in other circumstances. It allows for the setting up
2880     of explicit "queue times" so that various warning/retry things can be
2881     tested. Otherwise variability of clock ticks etc. cause problems. */
2882
2883     case 'T':
2884     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2885       fudged_queue_times = argv[++i];
2886     else badarg = TRUE;
2887     break;
2888
2889
2890     /* -t: Set flag to extract recipients from body of message. */
2891
2892     case 't':
2893     if (*argrest == 0) extract_recipients = TRUE;
2894
2895     /* -ti: Set flag to extract recipients from body of message, and also
2896     specify that dot does not end the message. */
2897
2898     else if (Ustrcmp(argrest, "i") == 0)
2899       {
2900       extract_recipients = TRUE;
2901       dot_ends = FALSE;
2902       }
2903
2904     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2905
2906     #ifdef SUPPORT_TLS
2907     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2908     #endif
2909
2910     else badarg = TRUE;
2911     break;
2912
2913
2914     /* -U: This means "initial user submission" in sendmail, apparently. The
2915     doc claims that in future sendmail may refuse syntactically invalid
2916     messages instead of fixing them. For the moment, we just ignore it. */
2917
2918     case 'U':
2919     break;
2920
2921
2922     /* -v: verify things - this is a very low-level debugging */
2923
2924     case 'v':
2925     if (*argrest == 0)
2926       {
2927       debug_selector |= D_v;
2928       debug_file = stderr;
2929       }
2930     else badarg = TRUE;
2931     break;
2932
2933
2934     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2935
2936       The -x flag tells the sendmail command that mail from a local
2937       mail program has National Language Support (NLS) extended characters
2938       in the body of the mail item. The sendmail command can send mail with
2939       extended NLS characters across networks that normally corrupts these
2940       8-bit characters.
2941
2942     As Exim is 8-bit clean, it just ignores this flag. */
2943
2944     case 'x':
2945     if (*argrest != 0) badarg = TRUE;
2946     break;
2947
2948     /* All other initial characters are errors */
2949
2950     default:
2951     badarg = TRUE;
2952     break;
2953     }         /* End of high-level switch statement */
2954
2955   /* Failed to recognize the option, or syntax error */
2956
2957   if (badarg)
2958     {
2959     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2960       "option %s\n", arg);
2961     exit(EXIT_FAILURE);
2962     }
2963   }
2964
2965
2966 /* If -R or -S have been specified without -q, assume a single queue run. */
2967
2968 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2969   queue_interval < 0) queue_interval = 0;
2970
2971
2972 END_ARG:
2973 /* If usage_wanted is set we call the usage function - which never returns */
2974 if (usage_wanted) exim_usage(called_as);
2975
2976 /* Arguments have been processed. Check for incompatibilities. */
2977 if ((
2978     (smtp_input || extract_recipients || recipients_arg < argc) &&
2979     (daemon_listen || queue_interval >= 0 || bi_option ||
2980       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2981       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2982     ) ||
2983     (
2984     msg_action_arg > 0 &&
2985     (daemon_listen || queue_interval >= 0 || list_options ||
2986       (checking && msg_action != MSG_LOAD) ||
2987       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2988     ) ||
2989     (
2990     (daemon_listen || queue_interval >= 0) &&
2991     (sender_address != NULL || list_options || list_queue || checking ||
2992       bi_option)
2993     ) ||
2994     (
2995     daemon_listen && queue_interval == 0
2996     ) ||
2997     (
2998     list_options &&
2999     (checking || smtp_input || extract_recipients ||
3000       filter_test != FTEST_NONE || bi_option)
3001     ) ||
3002     (
3003     verify_address_mode &&
3004     (address_test_mode || smtp_input || extract_recipients ||
3005       filter_test != FTEST_NONE || bi_option)
3006     ) ||
3007     (
3008     address_test_mode && (smtp_input || extract_recipients ||
3009       filter_test != FTEST_NONE || bi_option)
3010     ) ||
3011     (
3012     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3013       extract_recipients)
3014     ) ||
3015     (
3016     deliver_selectstring != NULL && queue_interval < 0
3017     ) ||
3018     (
3019     msg_action == MSG_LOAD &&
3020       (!expansion_test || expansion_test_message != NULL)
3021     )
3022    )
3023   {
3024   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3025   exit(EXIT_FAILURE);
3026   }
3027
3028 /* If debugging is set up, set the file and the file descriptor to pass on to
3029 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3030 to run in the foreground. */
3031
3032 if (debug_selector != 0)
3033   {
3034   debug_file = stderr;
3035   debug_fd = fileno(debug_file);
3036   background_daemon = FALSE;
3037   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
3038   if (debug_selector != D_v)    /* -v only doesn't show this */
3039     {
3040     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3041       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3042       debug_selector);
3043     show_whats_supported(stderr);
3044     }
3045   }
3046
3047 /* When started with root privilege, ensure that the limits on the number of
3048 open files and the number of processes (where that is accessible) are
3049 sufficiently large, or are unset, in case Exim has been called from an
3050 environment where the limits are screwed down. Not all OS have the ability to
3051 change some of these limits. */
3052
3053 if (unprivileged)
3054   {
3055   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3056   }
3057 else
3058   {
3059   struct rlimit rlp;
3060
3061   #ifdef RLIMIT_NOFILE
3062   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3063     {
3064     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3065       strerror(errno));
3066     rlp.rlim_cur = rlp.rlim_max = 0;
3067     }
3068
3069   /* I originally chose 1000 as a nice big number that was unlikely to
3070   be exceeded. It turns out that some older OS have a fixed upper limit of
3071   256. */
3072
3073   if (rlp.rlim_cur < 1000)
3074     {
3075     rlp.rlim_cur = rlp.rlim_max = 1000;
3076     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3077       {
3078       rlp.rlim_cur = rlp.rlim_max = 256;
3079       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3080         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3081           strerror(errno));
3082       }
3083     }
3084   #endif
3085
3086   #ifdef RLIMIT_NPROC
3087   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3088     {
3089     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3090       strerror(errno));
3091     rlp.rlim_cur = rlp.rlim_max = 0;
3092     }
3093
3094   #ifdef RLIM_INFINITY
3095   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3096     {
3097     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3098   #else
3099   if (rlp.rlim_cur < 1000)
3100     {
3101     rlp.rlim_cur = rlp.rlim_max = 1000;
3102   #endif
3103     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3104       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3105         strerror(errno));
3106     }
3107   #endif
3108   }
3109
3110 /* Exim is normally entered as root (but some special configurations are
3111 possible that don't do this). However, it always spins off sub-processes that
3112 set their uid and gid as required for local delivery. We don't want to pass on
3113 any extra groups that root may belong to, so we want to get rid of them all at
3114 this point.
3115
3116 We need to obey setgroups() at this stage, before possibly giving up root
3117 privilege for a changed configuration file, but later on we might need to
3118 check on the additional groups for the admin user privilege - can't do that
3119 till after reading the config, which might specify the exim gid. Therefore,
3120 save the group list here first. */
3121
3122 group_count = getgroups(NGROUPS_MAX, group_list);
3123
3124 /* There is a fundamental difference in some BSD systems in the matter of
3125 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3126 known not to be different. On the "different" systems there is a single group
3127 list, and the first entry in it is the current group. On all other versions of
3128 Unix there is a supplementary group list, which is in *addition* to the current
3129 group. Consequently, to get rid of all extraneous groups on a "standard" system
3130 you pass over 0 groups to setgroups(), while on a "different" system you pass
3131 over a single group - the current group, which is always the first group in the
3132 list. Calling setgroups() with zero groups on a "different" system results in
3133 an error return. The following code should cope with both types of system.
3134
3135 However, if this process isn't running as root, setgroups() can't be used
3136 since you have to be root to run it, even if throwing away groups. Not being
3137 root here happens only in some unusual configurations. We just ignore the
3138 error. */
3139
3140 if (setgroups(0, NULL) != 0)
3141   {
3142   if (setgroups(1, group_list) != 0 && !unprivileged)
3143     {
3144     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3145     exit(EXIT_FAILURE);
3146     }
3147   }
3148
3149 /* If the configuration file name has been altered by an argument on the
3150 command line (either a new file name or a macro definition) and the caller is
3151 not root or the exim user, or if this is a filter testing run, remove any
3152 setuid privilege the program has, and run as the underlying user.
3153
3154 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3155 severely restricts the use of -C for some purposes.
3156
3157 Otherwise, set the real ids to the effective values (should be root unless run
3158 from inetd, which it can either be root or the exim uid, if one is configured).
3159
3160 There is a private mechanism for bypassing some of this, in order to make it
3161 possible to test lots of configurations automatically, without having either to
3162 recompile each time, or to patch in an actual configuration file name and other
3163 values (such as the path name). If running in the test harness, pretend that
3164 configuration file changes and macro definitions haven't happened. */
3165
3166 if ((                                            /* EITHER */
3167     (config_changed || macros != NULL) &&        /* Config changed, and */
3168     real_uid != root_uid &&                      /* Not root, and */
3169     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3170     real_uid != exim_uid &&                      /* Not exim, and */
3171     #endif
3172     !running_in_test_harness                     /* Not fudged */
3173     ) ||                                         /*   OR   */
3174     expansion_test                               /* expansion testing */
3175     ||                                           /*   OR   */
3176     filter_test != FTEST_NONE)                   /* Filter testing */
3177   {
3178   setgroups(group_count, group_list);
3179   exim_setugid(real_uid, real_gid, FALSE,
3180     US"-C, -D, -be or -bf forces real uid");
3181   removed_privilege = TRUE;
3182
3183   /* In the normal case when Exim is called like this, stderr is available
3184   and should be used for any logging information because attempts to write
3185   to the log will usually fail. To arrange this, we unset really_exim. However,
3186   if no stderr is available there is no point - we might as well have a go
3187   at the log (if it fails, syslog will be written). */
3188
3189   if (log_stderr != NULL) really_exim = FALSE;
3190   }
3191
3192 /* Privilege is to be retained for the moment. It may be dropped later,
3193 depending on the job that this Exim process has been asked to do. For now, set
3194 the real uid to the effective so that subsequent re-execs of Exim are done by a
3195 privileged user. */
3196
3197 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3198
3199 /* If testing a filter, open the file(s) now, before wasting time doing other
3200 setups and reading the message. */
3201
3202 if ((filter_test & FTEST_SYSTEM) != 0)
3203   {
3204   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3205   if (filter_sfd < 0)
3206     {
3207     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3208       strerror(errno));
3209     return EXIT_FAILURE;
3210     }
3211   }
3212
3213 if ((filter_test & FTEST_USER) != 0)
3214   {
3215   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3216   if (filter_ufd < 0)
3217     {
3218     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3219       strerror(errno));
3220     return EXIT_FAILURE;
3221     }
3222   }
3223
3224 /* Read the main runtime configuration data; this gives up if there
3225 is a failure. It leaves the configuration file open so that the subsequent
3226 configuration data for delivery can be read if needed. */
3227
3228 readconf_main();
3229
3230 /* Handle the decoding of logging options. */
3231
3232 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3233   log_options, log_options_count, US"log");
3234
3235 DEBUG(D_any)
3236   {
3237   debug_printf("configuration file is %s\n", config_main_filename);
3238   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3239     log_extra_selector);
3240   }
3241
3242 /* If domain literals are not allowed, check the sender address that was
3243 supplied with -f. Ditto for a stripped trailing dot. */
3244
3245 if (sender_address != NULL)
3246   {
3247   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3248     {
3249     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3250       "allowed\n", sender_address);
3251     return EXIT_FAILURE;
3252     }
3253   if (f_end_dot && !strip_trailing_dot)
3254     {
3255     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3256       "(trailing dot not allowed)\n", sender_address);
3257     return EXIT_FAILURE;
3258     }
3259   }
3260
3261 /* Paranoia check of maximum lengths of certain strings. There is a check
3262 on the length of the log file path in log.c, which will come into effect
3263 if there are any calls to write the log earlier than this. However, if we
3264 get this far but the string is very long, it is better to stop now than to
3265 carry on and (e.g.) receive a message and then have to collapse. The call to
3266 log_write() from here will cause the ultimate panic collapse if the complete
3267 file name exceeds the buffer length. */
3268
3269 if (Ustrlen(log_file_path) > 200)
3270   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3271     "log_file_path is longer than 200 chars: aborting");
3272
3273 if (Ustrlen(pid_file_path) > 200)
3274   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3275     "pid_file_path is longer than 200 chars: aborting");
3276
3277 if (Ustrlen(spool_directory) > 200)
3278   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3279     "spool_directory is longer than 200 chars: aborting");
3280
3281 /* Length check on the process name given to syslog for its TAG field,
3282 which is only permitted to be 32 characters or less. See RFC 3164. */
3283
3284 if (Ustrlen(syslog_processname) > 32)
3285   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3286     "syslog_processname is longer than 32 chars: aborting");
3287
3288 /* In some operating systems, the environment variable TMPDIR controls where
3289 temporary files are created; Exim doesn't use these (apart from when delivering
3290 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3291 If TMPDIR is found in the environment, reset it to the value defined in the
3292 TMPDIR macro, if this macro is defined. */
3293
3294 #ifdef TMPDIR
3295   {
3296   uschar **p;
3297   for (p = USS environ; *p != NULL; p++)
3298     {
3299     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3300         Ustrcmp(*p+7, TMPDIR) != 0)
3301       {
3302       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3303       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3304       *p = newp;
3305       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3306       }
3307     }
3308   }
3309 #endif
3310
3311 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3312 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3313 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3314 called by a user who has set the TZ variable. This then affects the timestamps
3315 in log files and in Received: headers, and any created Date: header lines. The
3316 required timezone is settable in the configuration file, so nothing can be done
3317 about this earlier - but hopefully nothing will normally be logged earlier than
3318 this. We have to make a new environment if TZ is wrong, but don't bother if
3319 timestamps_utc is set, because then all times are in UTC anyway. */
3320
3321 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3322   {
3323   timestamps_utc = TRUE;
3324   }
3325 else
3326   {
3327   uschar *envtz = US getenv("TZ");
3328   if ((envtz == NULL && timezone_string != NULL) ||
3329       (envtz != NULL &&
3330         (timezone_string == NULL ||
3331          Ustrcmp(timezone_string, envtz) != 0)))
3332     {
3333     uschar **p = USS environ;
3334     uschar **new;
3335     uschar **newp;
3336     int count = 0;
3337     while (*p++ != NULL) count++;
3338     if (envtz == NULL) count++;
3339     newp = new = malloc(sizeof(uschar *) * (count + 1));
3340     for (p = USS environ; *p != NULL; p++)
3341       {
3342       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3343       *newp++ = *p;
3344       }
3345     if (timezone_string != NULL)
3346       {
3347       *newp = malloc(Ustrlen(timezone_string) + 4);
3348       sprintf(CS *newp++, "TZ=%s", timezone_string);
3349       }
3350     *newp = NULL;
3351     environ = CSS new;
3352     tzset();
3353     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3354       tod_stamp(tod_log));
3355     }
3356   }
3357
3358 /* Handle the case when we have removed the setuid privilege because of -C or
3359 -D. This means that the caller of Exim was not root, and, provided that
3360 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3361 the binary.
3362
3363 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3364 were running as the exim user defined in the configuration file (different to
3365 the one in the binary). The sysadmin may expect this case to retain privilege
3366 because "the binary was called by the Exim user", but it hasn't, because of the
3367 order in which it handles this stuff. There are two possibilities:
3368
3369   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3370       to do message deliveries. Thus, the fact that it is running as a
3371       non-privileged user is plausible, and might be wanted in some special
3372       configurations. However, really_exim will have been set false when
3373       privilege was dropped, to stop Exim trying to write to its normal log
3374       files. Therefore, re-enable normal log processing, assuming the sysadmin
3375       has set up the log directory correctly.
3376
3377   (2) If deliver_drop_privilege is not set, the configuration won't work as
3378       apparently intended, and so we log a panic message. In order to retain
3379       root for -C or -D, the caller must either be root or the Exim user
3380       defined in the binary (when deliver_drop_ privilege is false).
3381
3382 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3383 built-in exim user or one defined in the configuration. In either event,
3384 re-enable log processing, assuming the sysadmin knows what they are doing. */
3385
3386 if (removed_privilege && (config_changed || macros != NULL) &&
3387     real_uid == exim_uid)
3388   {
3389   #ifdef ALT_CONFIG_ROOT_ONLY
3390   really_exim = TRUE;   /* let logging work normally */
3391   #else
3392
3393   if (deliver_drop_privilege)
3394     really_exim = TRUE; /* let logging work normally */
3395   else
3396     log_write(0, LOG_MAIN|LOG_PANIC,
3397       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3398       (int)exim_uid, config_changed? "-C" : "-D");
3399   #endif
3400   }
3401
3402 /* Start up Perl interpreter if Perl support is configured and there is a
3403 perl_startup option, and the configuration or the command line specifies
3404 initializing starting. Note that the global variables are actually called
3405 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3406
3407 #ifdef EXIM_PERL
3408 if (perl_start_option != 0)
3409   opt_perl_at_start = (perl_start_option > 0);
3410 if (opt_perl_at_start && opt_perl_startup != NULL)
3411   {
3412   uschar *errstr;
3413   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3414   errstr = init_perl(opt_perl_startup);
3415   if (errstr != NULL)
3416     {
3417     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3418     return EXIT_FAILURE;
3419     }
3420   opt_perl_started = TRUE;
3421   }
3422 #endif /* EXIM_PERL */
3423
3424 /* Log the arguments of the call if the configuration file said so. This is
3425 a debugging feature for finding out what arguments certain MUAs actually use.
3426 Don't attempt it if logging is disabled, or if listing variables or if
3427 verifying/testing addresses or expansions. */
3428
3429 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3430       && really_exim && !list_options && !checking)
3431   {
3432   int i;
3433   uschar *p = big_buffer;
3434   Ustrcpy(p, "cwd=");
3435   (void)getcwd(CS p+4, big_buffer_size - 4);
3436   while (*p) p++;
3437   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3438   while (*p) p++;
3439   for (i = 0; i < argc; i++)
3440     {
3441     int len = Ustrlen(argv[i]);
3442     uschar *printing;
3443     uschar *quote;
3444     if (p + len + 8 >= big_buffer + big_buffer_size)
3445       {
3446       Ustrcpy(p, " ...");
3447       log_write(0, LOG_MAIN, "%s", big_buffer);
3448       Ustrcpy(big_buffer, "...");
3449       p = big_buffer + 3;
3450       }
3451     printing = string_printing(argv[i]);
3452     if (printing[0] == 0) quote = US"\""; else
3453       {
3454       uschar *pp = printing;
3455       quote = US"";
3456       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3457       }
3458     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3459       (p - big_buffer) - 4), printing, quote);
3460     while (*p) p++;
3461     }
3462
3463   if ((log_extra_selector & LX_arguments) != 0)
3464     log_write(0, LOG_MAIN, "%s", big_buffer);
3465   else
3466     debug_printf("%s\n", big_buffer);
3467   }
3468
3469 /* Set the working directory to be the top-level spool directory. We don't rely
3470 on this in the code, which always uses fully qualified names, but it's useful
3471 for core dumps etc. Don't complain if it fails - the spool directory might not
3472 be generally accessible and calls with the -C option (and others) have lost
3473 privilege by now. Before the chdir, we try to ensure that the directory exists.
3474 */
3475
3476 if (Uchdir(spool_directory) != 0)
3477   {
3478   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3479   (void)Uchdir(spool_directory);
3480   }
3481
3482 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3483 alias file. Exim doesn't have such a concept, but this call is screwed into
3484 Sun's YP makefiles. Handle this by calling a configured script, as the real
3485 user who called Exim. The -oA option can be used to pass an argument to the
3486 script. */
3487
3488 if (bi_option)
3489   {
3490   (void)fclose(config_file);
3491   if (bi_command != NULL)
3492     {
3493     int i = 0;
3494     uschar *argv[3];
3495     argv[i++] = bi_command;
3496     if (alias_arg != NULL) argv[i++] = alias_arg;
3497     argv[i++] = NULL;
3498
3499     setgroups(group_count, group_list);
3500     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3501
3502     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3503       (argv[1] == NULL)? US"" : argv[1]);
3504
3505     execv(CS argv[0], (char *const *)argv);
3506     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3507     exit(EXIT_FAILURE);
3508     }
3509   else
3510     {
3511     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3512     exit(EXIT_SUCCESS);
3513     }
3514   }
3515
3516 /* If an action on specific messages is requested, or if a daemon or queue
3517 runner is being started, we need to know if Exim was called by an admin user.
3518 This is the case if the real user is root or exim, or if the real group is
3519 exim, or if one of the supplementary groups is exim or a group listed in
3520 admin_groups. We don't fail all message actions immediately if not admin_user,
3521 since some actions can be performed by non-admin users. Instead, set admin_user
3522 for later interrogation. */
3523
3524 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3525   admin_user = TRUE;
3526 else
3527   {
3528   int i, j;
3529   for (i = 0; i < group_count; i++)
3530     {
3531     if (group_list[i] == exim_gid) admin_user = TRUE;
3532     else if (admin_groups != NULL)
3533       {
3534       for (j = 1; j <= (int)(admin_groups[0]); j++)
3535         if (admin_groups[j] == group_list[i])
3536           { admin_user = TRUE; break; }
3537       }
3538     if (admin_user) break;
3539     }
3540   }
3541
3542 /* Another group of privileged users are the trusted users. These are root,
3543 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3544 are permitted to specify sender_addresses with -f on the command line, and
3545 other message parameters as well. */
3546
3547 if (real_uid == root_uid || real_uid == exim_uid)
3548   trusted_caller = TRUE;
3549 else
3550   {
3551   int i, j;
3552
3553   if (trusted_users != NULL)
3554     {
3555     for (i = 1; i <= (int)(trusted_users[0]); i++)
3556       if (trusted_users[i] == real_uid)
3557         { trusted_caller = TRUE; break; }
3558     }
3559
3560   if (!trusted_caller && trusted_groups != NULL)
3561     {
3562     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3563       {
3564       if (trusted_groups[i] == real_gid)
3565         trusted_caller = TRUE;
3566       else for (j = 0; j < group_count; j++)
3567         {
3568         if (trusted_groups[i] == group_list[j])
3569           { trusted_caller = TRUE; break; }
3570         }
3571       if (trusted_caller) break;
3572       }
3573     }
3574   }
3575
3576 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3577 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3578
3579 /* Only an admin user may start the daemon or force a queue run in the default
3580 configuration, but the queue run restriction can be relaxed. Only an admin
3581 user may request that a message be returned to its sender forthwith. Only an
3582 admin user may specify a debug level greater than D_v (because it might show
3583 passwords, etc. in lookup queries). Only an admin user may request a queue
3584 count. */
3585
3586 if (!admin_user)
3587   {
3588   BOOL debugset = (debug_selector & ~D_v) != 0;
3589   if (deliver_give_up || daemon_listen ||
3590      (count_queue && queue_list_requires_admin) ||
3591      (list_queue && queue_list_requires_admin) ||
3592      (queue_interval >= 0 && prod_requires_admin) ||
3593      (debugset && !running_in_test_harness))
3594     {
3595     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3596     exit(EXIT_FAILURE);
3597     }
3598   }
3599
3600 /* If the real user is not root or the exim uid, the argument for passing
3601 in an open TCP/IP connection for another message is not permitted, nor is
3602 running with the -N option for any delivery action, unless this call to exim is
3603 one that supplied an input message, or we are using a patched exim for
3604 regression testing. */
3605
3606 if (real_uid != root_uid && real_uid != exim_uid &&
3607      (continue_hostname != NULL ||
3608        (dont_deliver &&
3609          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3610        )) && !running_in_test_harness)
3611   {
3612   fprintf(stderr, "exim: Permission denied\n");
3613   return EXIT_FAILURE;
3614   }
3615
3616 /* If the caller is not trusted, certain arguments are ignored when running for
3617 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3618 Note that authority for performing certain actions on messages is tested in the
3619 queue_action() function. */
3620
3621 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3622   {
3623   sender_host_name = sender_host_address = interface_address =
3624     sender_ident = received_protocol = NULL;
3625   sender_host_port = interface_port = 0;
3626   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3627   }
3628
3629 /* If a sender host address is set, extract the optional port number off the
3630 end of it and check its syntax. Do the same thing for the interface address.
3631 Exim exits if the syntax is bad. */
3632
3633 else
3634   {
3635   if (sender_host_address != NULL)
3636     sender_host_port = check_port(sender_host_address);
3637   if (interface_address != NULL)
3638     interface_port = check_port(interface_address);
3639   }
3640
3641 /* If an SMTP message is being received check to see if the standard input is a
3642 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3643 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3644 barf. */
3645
3646 if (smtp_input)
3647   {
3648   union sockaddr_46 inetd_sock;
3649   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3650   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3651     {
3652     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3653     if (family == AF_INET || family == AF_INET6)
3654       {
3655       union sockaddr_46 interface_sock;
3656       size = sizeof(interface_sock);
3657
3658       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3659         interface_address = host_ntoa(-1, &interface_sock, NULL,
3660           &interface_port);
3661
3662       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3663
3664       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3665         {
3666         is_inetd = TRUE;
3667         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3668           NULL, &sender_host_port);
3669         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3670           "inetd is not supported when mua_wrapper is set");
3671         }
3672       else
3673         {
3674         fprintf(stderr,
3675           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3676         return EXIT_FAILURE;
3677         }
3678       }
3679     }
3680   }
3681
3682 /* If the load average is going to be needed while receiving a message, get it
3683 now for those OS that require the first call to os_getloadavg() to be done as
3684 root. There will be further calls later for each message received. */
3685
3686 #ifdef LOAD_AVG_NEEDS_ROOT
3687 if (receiving_message &&
3688       (queue_only_load >= 0 ||
3689         (is_inetd && smtp_load_reserve >= 0)
3690       ))
3691   {
3692   load_average = OS_GETLOADAVG();
3693   }
3694 #endif
3695
3696 /* The queue_only configuration option can be overridden by -odx on the command
3697 line, except that if queue_only_override is false, queue_only cannot be unset
3698 from the command line. */
3699
3700 if (queue_only_set && (queue_only_override || arg_queue_only))
3701   queue_only = arg_queue_only;
3702
3703 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3704 -or and -os. */
3705
3706 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3707 if (arg_smtp_receive_timeout >= 0)
3708   smtp_receive_timeout = arg_smtp_receive_timeout;
3709
3710 /* If Exim was started with root privilege, unless we have already removed the
3711 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3712 except when starting the daemon or doing some kind of delivery or address
3713 testing (-bt). These are the only cases when root need to be retained. We run
3714 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3715 retained only for starting the daemon. We always do the initgroups() in this
3716 situation (controlled by the TRUE below), in order to be as close as possible
3717 to the state Exim usually runs in. */
3718
3719 if (!unprivileged &&                      /* originally had root AND */
3720     !removed_privilege &&                 /* still got root AND      */
3721     !daemon_listen &&                     /* not starting the daemon */
3722     queue_interval <= 0 &&                /* (either kind of daemon) */
3723       (                                   /*    AND EITHER           */
3724       deliver_drop_privilege ||           /* requested unprivileged  */
3725         (                                 /*       OR                */
3726         queue_interval < 0 &&             /* not running the queue   */
3727         (msg_action_arg < 0 ||            /*       and               */
3728           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3729         (!checking || !address_test_mode) /* not address checking    */
3730         )
3731       ))
3732   {
3733   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3734   }
3735
3736 /* When we are retaining a privileged uid, we still change to the exim gid. */
3737
3738 else setgid(exim_gid);
3739
3740 /* Handle a request to list the delivery queue */
3741
3742 if (list_queue)
3743   {
3744   set_process_info("listing the queue");
3745   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3746   exit(EXIT_SUCCESS);
3747   }
3748
3749 /* Handle a request to count the delivery queue */
3750
3751 if (count_queue)
3752   {
3753   set_process_info("counting the queue");
3754   queue_count();
3755   exit(EXIT_SUCCESS);
3756   }
3757
3758 /* Handle actions on specific messages, except for the force delivery and
3759 message load actions, which are done below. Some actions take a whole list of
3760 message ids, which are known to continue up to the end of the arguments. Others
3761 take a single message id and then operate on the recipients list. */
3762
3763 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3764   {
3765   int yield = EXIT_SUCCESS;
3766   set_process_info("acting on specified messages");
3767
3768   if (!one_msg_action)
3769     {
3770     for (i = msg_action_arg; i < argc; i++)
3771       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3772         yield = EXIT_FAILURE;
3773     }
3774
3775   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3776     recipients_arg)) yield = EXIT_FAILURE;
3777   exit(yield);
3778   }
3779
3780 /* All the modes below here require the remaining configuration sections
3781 to be read, except that we can skip over the ACL setting when delivering
3782 specific messages, or doing a queue run. (For various testing cases we could
3783 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3784 for skipping. */
3785
3786 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3787
3788 /* The configuration data will have been read into POOL_PERM because we won't
3789 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3790 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3791 configuration were read into POOL_MAIN, because we don't do any resets till
3792 later on. However, it seems right, and it does ensure that both pools get used.
3793 */
3794
3795 store_pool = POOL_MAIN;
3796
3797 /* Handle the -brt option. This is for checking out retry configurations.
3798 The next three arguments are a domain name or a complete address, and
3799 optionally two error numbers. All it does is to call the function that
3800 scans the retry configuration data. */
3801
3802 if (test_retry_arg >= 0)
3803   {
3804   retry_config *yield;
3805   int basic_errno = 0;
3806   int more_errno = 0;
3807   uschar *s1, *s2;
3808
3809   if (test_retry_arg >= argc)
3810     {
3811     printf("-brt needs a domain or address argument\n");
3812     exim_exit(EXIT_FAILURE);
3813     }
3814   s1 = argv[test_retry_arg++];
3815   s2 = NULL;
3816
3817   /* If the first argument contains no @ and no . it might be a local user
3818   or it might be a single-component name. Treat as a domain. */
3819
3820   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3821     {
3822     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3823       "being \ntreated as a one-component domain, not as a local part.\n\n",
3824       s1);
3825     }
3826
3827   /* There may be an optional second domain arg. */
3828
3829   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3830     s2 = argv[test_retry_arg++];
3831
3832   /* The final arg is an error name */
3833
3834   if (test_retry_arg < argc)
3835     {
3836     uschar *ss = argv[test_retry_arg];
3837     uschar *error =
3838       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3839     if (error != NULL)
3840       {
3841       printf("%s\n", CS error);
3842       return EXIT_FAILURE;
3843       }
3844
3845     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3846     code > 100 as an error is for matching codes to the decade. Turn them into
3847     a real error code, off the decade. */
3848
3849     if (basic_errno == ERRNO_MAIL4XX ||
3850         basic_errno == ERRNO_RCPT4XX ||
3851         basic_errno == ERRNO_DATA4XX)
3852       {
3853       int code = (more_errno >> 8) & 255;
3854       if (code == 255)
3855         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3856       else if (code > 100)
3857         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3858       }
3859     }
3860
3861   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3862   if (yield == NULL) printf("No retry information found\n"); else
3863     {
3864     retry_rule *r;
3865     more_errno = yield->more_errno;
3866     printf("Retry rule: %s  ", yield->pattern);
3867
3868     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3869       {
3870       printf("quota%s%s  ",
3871         (more_errno > 0)? "_" : "",
3872         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3873       }
3874     else if (yield->basic_errno == ECONNREFUSED)
3875       {
3876       printf("refused%s%s  ",
3877         (more_errno > 0)? "_" : "",
3878         (more_errno == 'M')? "MX" :
3879         (more_errno == 'A')? "A" : "");
3880       }
3881     else if (yield->basic_errno == ETIMEDOUT)
3882       {
3883       printf("timeout");
3884       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3885       more_errno &= 255;
3886       if (more_errno != 0) printf("_%s",
3887         (more_errno == 'M')? "MX" : "A");
3888       printf("  ");
3889       }
3890     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3891       printf("auth_failed  ");
3892     else printf("*  ");
3893
3894     for (r = yield->rules; r != NULL; r = r->next)
3895       {
3896       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3897       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3898       if (r->rule == 'G')
3899         {
3900         int x = r->p2;
3901         int f = x % 1000;
3902         int d = 100;
3903         printf(",%d.", x/1000);
3904         do
3905           {
3906           printf("%d", f/d);
3907           f %= d;
3908           d /= 10;
3909           }
3910         while (f != 0);
3911         }
3912       printf("; ");
3913       }
3914
3915     printf("\n");
3916     }
3917   exim_exit(EXIT_SUCCESS);
3918   }
3919
3920 /* Handle a request to list one or more configuration options */
3921
3922 if (list_options)
3923   {
3924   set_process_info("listing variables");
3925   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3926     else for (i = recipients_arg; i < argc; i++)
3927       {
3928       if (i < argc - 1 &&
3929           (Ustrcmp(argv[i], "router") == 0 ||
3930            Ustrcmp(argv[i], "transport") == 0 ||
3931            Ustrcmp(argv[i], "authenticator") == 0))
3932         {
3933         readconf_print(argv[i+1], argv[i]);
3934         i++;
3935         }
3936       else readconf_print(argv[i], NULL);
3937       }
3938   exim_exit(EXIT_SUCCESS);
3939   }
3940
3941
3942 /* Handle a request to deliver one or more messages that are already on the
3943 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3944 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3945
3946 Delivery of specific messages is typically used for a small number when
3947 prodding by hand (when the option forced_delivery will be set) or when
3948 re-execing to regain root privilege. Each message delivery must happen in a
3949 separate process, so we fork a process for each one, and run them sequentially
3950 so that debugging output doesn't get intertwined, and to avoid spawning too
3951 many processes if a long list is given. However, don't fork for the last one;
3952 this saves a process in the common case when Exim is called to deliver just one
3953 message. */
3954
3955 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3956   {
3957   if (prod_requires_admin && !admin_user)
3958     {
3959     fprintf(stderr, "exim: Permission denied\n");
3960     exim_exit(EXIT_FAILURE);
3961     }
3962   set_process_info("delivering specified messages");
3963   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3964   for (i = msg_action_arg; i < argc; i++)
3965     {
3966     int status;
3967     pid_t pid;
3968     if (i == argc - 1)
3969       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3970     else if ((pid = fork()) == 0)
3971       {
3972       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3973       _exit(EXIT_SUCCESS);
3974       }
3975     else if (pid < 0)
3976       {
3977       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3978         strerror(errno));
3979       exim_exit(EXIT_FAILURE);
3980       }
3981     else wait(&status);
3982     }
3983   exim_exit(EXIT_SUCCESS);
3984   }
3985
3986
3987 /* If only a single queue run is requested, without SMTP listening, we can just
3988 turn into a queue runner, with an optional starting message id. */
3989
3990 if (queue_interval == 0 && !daemon_listen)
3991   {
3992   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3993     (start_queue_run_id == NULL)? US"" : US" starting at ",
3994     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3995     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3996     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3997   set_process_info("running the queue (single queue run)");
3998   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3999   exim_exit(EXIT_SUCCESS);
4000   }
4001
4002
4003 /* Find the login name of the real user running this process. This is always
4004 needed when receiving a message, because it is written into the spool file. It
4005 may also be used to construct a from: or a sender: header, and in this case we
4006 need the user's full name as well, so save a copy of it, checked for RFC822
4007 syntax and munged if necessary, if it hasn't previously been set by the -F
4008 argument. We may try to get the passwd entry more than once, in case NIS or
4009 other delays are in evidence. Save the home directory for use in filter testing
4010 (only). */
4011
4012 for (i = 0;;)
4013   {
4014   if ((pw = getpwuid(real_uid)) != NULL)
4015     {
4016     originator_login = string_copy(US pw->pw_name);
4017     originator_home = string_copy(US pw->pw_dir);
4018
4019     /* If user name has not been set by -F, set it from the passwd entry
4020     unless -f has been used to set the sender address by a trusted user. */
4021
4022     if (originator_name == NULL)
4023       {
4024       if (sender_address == NULL ||
4025            (!trusted_caller && filter_test == FTEST_NONE))
4026         {
4027         uschar *name = US pw->pw_gecos;
4028         uschar *amp = Ustrchr(name, '&');
4029         uschar buffer[256];
4030
4031         /* Most Unix specify that a '&' character in the gecos field is
4032         replaced by a copy of the login name, and some even specify that
4033         the first character should be upper cased, so that's what we do. */
4034
4035         if (amp != NULL)
4036           {
4037           int loffset;
4038           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4039             amp - name, name, &loffset, originator_login, amp + 1);
4040           buffer[loffset] = toupper(buffer[loffset]);
4041           name = buffer;
4042           }
4043
4044         /* If a pattern for matching the gecos field was supplied, apply
4045         it and then expand the name string. */
4046
4047         if (gecos_pattern != NULL && gecos_name != NULL)
4048           {
4049           const pcre *re;
4050           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4051
4052           if (regex_match_and_setup(re, name, 0, -1))
4053             {
4054             uschar *new_name = expand_string(gecos_name);
4055             expand_nmax = -1;
4056             if (new_name != NULL)
4057               {
4058               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4059                 "gecos field \"%s\"\n", new_name, name);
4060               name = new_name;
4061               }
4062             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4063               "\"%s\": %s\n", gecos_name, expand_string_message);
4064             }
4065           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4066             "gecos field \"%s\"\n", gecos_pattern, name);
4067           store_free((void *)re);
4068           }
4069         originator_name = string_copy(name);
4070         }
4071
4072       /* A trusted caller has used -f but not -F */
4073
4074       else originator_name = US"";
4075       }
4076
4077     /* Break the retry loop */
4078
4079     break;
4080     }
4081
4082   if (++i > finduser_retries) break;
4083   sleep(1);
4084   }
4085
4086 /* If we cannot get a user login, log the incident and give up, unless the
4087 configuration specifies something to use. When running in the test harness,
4088 any setting of unknown_login overrides the actual name. */
4089
4090 if (originator_login == NULL || running_in_test_harness)
4091   {
4092   if (unknown_login != NULL)
4093     {
4094     originator_login = expand_string(unknown_login);
4095     if (originator_name == NULL && unknown_username != NULL)
4096       originator_name = expand_string(unknown_username);
4097     if (originator_name == NULL) originator_name = US"";
4098     }
4099   if (originator_login == NULL)
4100     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4101       (int)real_uid);
4102   }
4103
4104 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4105 RFC822 address.*/
4106
4107 originator_name = string_copy(parse_fix_phrase(originator_name,
4108   Ustrlen(originator_name), big_buffer, big_buffer_size));
4109
4110 /* If a message is created by this call of Exim, the uid/gid of its originator
4111 are those of the caller. These values are overridden if an existing message is
4112 read in from the spool. */
4113
4114 originator_uid = real_uid;
4115 originator_gid = real_gid;
4116
4117 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4118   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4119
4120 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4121 returns. We leave this till here so that the originator_ fields are available
4122 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4123 mode. */
4124
4125 if (daemon_listen || queue_interval > 0)
4126   {
4127   if (mua_wrapper)
4128     {
4129     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4130     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4131       "mua_wrapper is set");
4132     }
4133   daemon_go();
4134   }
4135
4136 /* If the sender ident has not been set (by a trusted caller) set it to
4137 the caller. This will get overwritten below for an inetd call. If a trusted
4138 caller has set it empty, unset it. */
4139
4140 if (sender_ident == NULL) sender_ident = originator_login;
4141   else if (sender_ident[0] == 0) sender_ident = NULL;
4142
4143 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4144 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4145 originator_* variables set. */
4146
4147 if (test_rewrite_arg >= 0)
4148   {
4149   really_exim = FALSE;
4150   if (test_rewrite_arg >= argc)
4151     {
4152     printf("-brw needs an address argument\n");
4153     exim_exit(EXIT_FAILURE);
4154     }
4155   rewrite_test(argv[test_rewrite_arg]);
4156   exim_exit(EXIT_SUCCESS);
4157   }
4158
4159 /* A locally-supplied message is considered to be coming from a local user
4160 unless a trusted caller supplies a sender address with -f, or is passing in the
4161 message via SMTP (inetd invocation or otherwise). */
4162
4163 if ((sender_address == NULL && !smtp_input) ||
4164     (!trusted_caller && filter_test == FTEST_NONE))
4165   {
4166   sender_local = TRUE;
4167
4168   /* A trusted caller can supply authenticated_sender and authenticated_id
4169   via -oMas and -oMai and if so, they will already be set. Otherwise, force
4170   defaults except when host checking. */
4171
4172   if (authenticated_sender == NULL && !host_checking)
4173     authenticated_sender = string_sprintf("%s@%s", originator_login,
4174       qualify_domain_sender);
4175   if (authenticated_id == NULL && !host_checking)
4176     authenticated_id = originator_login;
4177   }
4178
4179 /* Trusted callers are always permitted to specify the sender address.
4180 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4181 is specified is the empty address. However, if a trusted caller does not
4182 specify a sender address for SMTP input, we leave sender_address unset. This
4183 causes the MAIL commands to be honoured. */
4184
4185 if ((!smtp_input && sender_address == NULL) ||
4186     !receive_check_set_sender(sender_address))
4187   {
4188   /* Either the caller is not permitted to set a general sender, or this is
4189   non-SMTP input and the trusted caller has not set a sender. If there is no
4190   sender, or if a sender other than <> is set, override with the originator's
4191   login (which will get qualified below), except when checking things. */
4192
4193   if (sender_address == NULL             /* No sender_address set */
4194        ||                                /*         OR            */
4195        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4196        !checking &&                      /* Not running tests, AND */
4197        filter_test == FTEST_NONE))       /* Not testing a filter */
4198     {
4199     sender_address = originator_login;
4200     sender_address_forced = FALSE;
4201     sender_address_domain = 0;
4202     }
4203   }
4204
4205 /* Remember whether an untrusted caller set the sender address */
4206
4207 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4208
4209 /* Ensure that the sender address is fully qualified unless it is the empty
4210 address, which indicates an error message, or doesn't exist (root caller, smtp
4211 interface, no -f argument). */
4212
4213 if (sender_address != NULL && sender_address[0] != 0 &&
4214     sender_address_domain == 0)
4215   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4216     qualify_domain_sender);
4217
4218 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4219
4220 /* Handle a request to verify a list of addresses, or test them for delivery.
4221 This must follow the setting of the sender address, since routers can be
4222 predicated upon the sender. If no arguments are given, read addresses from
4223 stdin. Set debug_level to at least D_v to get full output for address testing.
4224 */
4225
4226 if (verify_address_mode || address_test_mode)
4227   {
4228   int exit_value = 0;
4229   int flags = vopt_qualify;
4230
4231   if (verify_address_mode)
4232     {
4233     if (!verify_as_sender) flags |= vopt_is_recipient;
4234     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4235     }
4236
4237   else
4238     {
4239     flags |= vopt_is_recipient;
4240     debug_selector |= D_v;
4241     debug_file = stderr;
4242     debug_fd = fileno(debug_file);
4243     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4244     }
4245
4246   if (recipients_arg < argc)
4247     {
4248     while (recipients_arg < argc)
4249       {
4250       uschar *s = argv[recipients_arg++];
4251       while (*s != 0)
4252         {
4253         BOOL finished = FALSE;
4254         uschar *ss = parse_find_address_end(s, FALSE);
4255         if (*ss == ',') *ss = 0; else finished = TRUE;
4256         test_address(s, flags, &exit_value);
4257         s = ss;
4258         if (!finished)
4259           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4260         }
4261       }
4262     }
4263
4264   else for (;;)
4265     {
4266     uschar *s = get_stdinput(NULL, NULL);
4267     if (s == NULL) break;
4268     test_address(s, flags, &exit_value);
4269     }
4270
4271   route_tidyup();
4272   exim_exit(exit_value);
4273   }
4274
4275 /* Handle expansion checking. Either expand items on the command line, or read
4276 from stdin if there aren't any. If -Mset was specified, load the message so
4277 that its variables can be used, but restrict this facility to admin users.
4278 Otherwise, if -bem was used, read a message from stdin. */
4279
4280 if (expansion_test)
4281   {
4282   if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4283     {
4284     uschar spoolname[256];  /* Not big_buffer; used in spool_read_header() */
4285     if (!admin_user)
4286       {
4287       fprintf(stderr, "exim: permission denied\n");
4288       exit(EXIT_FAILURE);
4289       }
4290     message_id = argv[msg_action_arg];
4291     (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4292     if (!spool_open_datafile(message_id))
4293       printf ("Failed to load message datafile %s\n", message_id);
4294     if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4295       printf ("Failed to load message %s\n", message_id);
4296     }
4297
4298   /* Read a test message from a file. We fudge it up to be on stdin, saving
4299   stdin itself for later reading of expansion strings. */
4300
4301   else if (expansion_test_message != NULL)
4302     {
4303     int save_stdin = dup(0);
4304     int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4305     if (fd < 0)
4306       {
4307       fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4308         strerror(errno));
4309       return EXIT_FAILURE;
4310       }
4311     (void) dup2(fd, 0);
4312     filter_test = FTEST_USER;      /* Fudge to make it look like filter test */
4313     message_ended = END_NOTENDED;
4314     read_message_body(receive_msg(extract_recipients));
4315     message_linecount += body_linecount;
4316     (void)dup2(save_stdin, 0);
4317     (void)close(save_stdin);
4318     clearerr(stdin);               /* Required by Darwin */
4319     }
4320
4321   /* Allow $recipients for this testing */
4322
4323   enable_dollar_recipients = TRUE;
4324
4325   /* Expand command line items */
4326
4327   if (recipients_arg < argc)
4328     {
4329     while (recipients_arg < argc)
4330       {
4331       uschar *s = argv[recipients_arg++];
4332       uschar *ss = expand_string(s);
4333       if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4334       else printf("%s\n", CS ss);
4335       }
4336     }
4337
4338   /* Read stdin */
4339
4340   else
4341     {
4342     char *(*fn_readline)(char *) = NULL;
4343     char *(*fn_addhist)(char *) = NULL;
4344
4345     #ifdef USE_READLINE
4346     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4347     #endif
4348
4349     for (;;)
4350       {
4351       uschar *ss;
4352       uschar *source = get_stdinput(fn_readline, fn_addhist);
4353       if (source == NULL) break;
4354       ss = expand_string(source);
4355       if (ss == NULL)
4356         printf ("Failed: %s\n", expand_string_message);
4357       else printf("%s\n", CS ss);
4358       }
4359
4360     #ifdef USE_READLINE
4361     if (dlhandle != NULL) dlclose(dlhandle);
4362     #endif
4363     }
4364
4365   /* The data file will be open after -Mset */
4366
4367   if (deliver_datafile >= 0)
4368     {
4369     (void)close(deliver_datafile);
4370     deliver_datafile = -1;
4371     }
4372
4373   exim_exit(EXIT_SUCCESS);
4374   }
4375
4376
4377 /* The active host name is normally the primary host name, but it can be varied
4378 for hosts that want to play several parts at once. We need to ensure that it is
4379 set for host checking, and for receiving messages. */
4380
4381 smtp_active_hostname = primary_hostname;
4382 if (raw_active_hostname != NULL)
4383   {
4384   uschar *nah = expand_string(raw_active_hostname);
4385   if (nah == NULL)
4386     {
4387     if (!expand_string_forcedfail)
4388       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4389         "(smtp_active_hostname): %s", raw_active_hostname,
4390         expand_string_message);
4391     }
4392   else if (nah[0] != 0) smtp_active_hostname = nah;
4393   }
4394
4395 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4396 given IP address so that the blocking and relay configuration can be tested.
4397 Unless a sender_ident was set by -oMt, we discard it (the default is the
4398 caller's login name). An RFC 1413 call is made only if we are running in the
4399 test harness and an incoming interface and both ports are specified, because
4400 there is no TCP/IP call to find the ident for. */
4401
4402 if (host_checking)
4403   {
4404   int x[4];
4405   int size;
4406
4407   if (!sender_ident_set)
4408     {
4409     sender_ident = NULL;
4410     if (running_in_test_harness && sender_host_port != 0 &&
4411         interface_address != NULL && interface_port != 0)
4412       verify_get_ident(1413);
4413     }
4414
4415   /* In case the given address is a non-canonical IPv6 address, canonicize
4416   it. The code works for both IPv4 and IPv6, as it happens. */
4417
4418   size = host_aton(sender_host_address, x);
4419   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4420   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4421
4422   /* Now set up for testing */
4423
4424   host_build_sender_fullhost();
4425   smtp_input = TRUE;
4426   smtp_in = stdin;
4427   smtp_out = stdout;
4428   sender_local = FALSE;
4429   sender_host_notsocket = TRUE;
4430   debug_file = stderr;
4431   debug_fd = fileno(debug_file);
4432   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4433     "**** but without any ident (RFC 1413) callback.\n"
4434     "**** This is not for real!\n\n",
4435       sender_host_address);
4436
4437   if (verify_check_host(&hosts_connection_nolog) == OK)
4438     log_write_selector &= ~L_smtp_connection;
4439   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4440
4441   /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4442   because a log line has already been written for all its failure exists
4443   (usually "connection refused: <reason>") and writing another one is
4444   unnecessary clutter. */
4445
4446   if (smtp_start_session())
4447     {
4448     reset_point = store_get(0);
4449     for (;;)
4450       {
4451       store_reset(reset_point);
4452       if (smtp_setup_msg() <= 0) break;
4453       if (!receive_msg(FALSE)) break;
4454       }
4455     smtp_log_no_mail();
4456     }
4457   exim_exit(EXIT_SUCCESS);
4458   }
4459
4460
4461 /* Arrange for message reception if recipients or SMTP were specified;
4462 otherwise complain unless a version print (-bV) happened or this is a filter
4463 verification test. In the former case, show the configuration file name. */
4464
4465 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4466   {
4467   if (version_printed)
4468     {
4469     printf("Configuration file is %s\n", config_main_filename);
4470     return EXIT_SUCCESS;
4471     }
4472
4473   if (filter_test == FTEST_NONE)
4474     exim_usage(called_as);
4475   }
4476
4477
4478 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4479 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4480 that we are not called from inetd, because that is rejected above. The
4481 following configuration settings are forced here:
4482
4483   (1) Synchronous delivery (-odi)
4484   (2) Errors to stderr (-oep == -oeq)
4485   (3) No parallel remote delivery
4486   (4) Unprivileged delivery
4487
4488 We don't force overall queueing options because there are several of them;
4489 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4490 to override any SMTP queueing. */
4491
4492 if (mua_wrapper)
4493   {
4494   synchronous_delivery = TRUE;
4495   arg_error_handling = ERRORS_STDERR;
4496   remote_max_parallel = 1;
4497   deliver_drop_privilege = TRUE;
4498   queue_smtp = FALSE;
4499   queue_smtp_domains = NULL;
4500   }
4501
4502
4503 /* Prepare to accept one or more new messages on the standard input. When a
4504 message has been read, its id is returned in message_id[]. If doing immediate
4505 delivery, we fork a delivery process for each received message, except for the
4506 last one, where we can save a process switch.
4507
4508 It is only in non-smtp mode that error_handling is allowed to be changed from
4509 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4510 sendmail error modes other than -oem ever actually used? Later: yes.) */
4511
4512 if (!smtp_input) error_handling = arg_error_handling;
4513
4514 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4515 logging being sent down the socket and make an identd call to get the
4516 sender_ident. */
4517
4518 else if (is_inetd)
4519   {
4520   (void)fclose(stderr);
4521   exim_nullstd();                       /* Re-open to /dev/null */
4522   verify_get_ident(IDENT_PORT);
4523   host_build_sender_fullhost();
4524   set_process_info("handling incoming connection from %s via inetd",
4525     sender_fullhost);
4526   }
4527
4528 /* If the sender host address has been set, build sender_fullhost if it hasn't
4529 already been done (which it will have been for inetd). This caters for the
4530 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4531 so that the test for IP options is skipped for -bs input. */
4532
4533 if (sender_host_address != NULL && sender_fullhost == NULL)
4534   {
4535   host_build_sender_fullhost();
4536   set_process_info("handling incoming connection from %s via -oMa",
4537     sender_fullhost);
4538   sender_host_notsocket = TRUE;
4539   }
4540
4541 /* Otherwise, set the sender host as unknown except for inetd calls. This
4542 prevents host checking in the case of -bs not from inetd and also for -bS. */
4543
4544 else if (!is_inetd) sender_host_unknown = TRUE;
4545
4546 /* If stdout does not exist, then dup stdin to stdout. This can happen
4547 if exim is started from inetd. In this case fd 0 will be set to the socket,
4548 but fd 1 will not be set. This also happens for passed SMTP channels. */
4549
4550 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4551
4552 /* Set up the incoming protocol name and the state of the program. Root is
4553 allowed to force received protocol via the -oMr option above. If we have come
4554 via inetd, the process info has already been set up. We don't set
4555 received_protocol here for smtp input, as it varies according to
4556 batch/HELO/EHLO/AUTH/TLS. */
4557
4558 if (smtp_input)
4559   {
4560   if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4561     smtp_batched_input? "batched " : "",
4562     (sender_address!= NULL)? sender_address : originator_login);
4563   }
4564 else
4565   {
4566   if (received_protocol == NULL)
4567     received_protocol = string_sprintf("local%s", called_as);
4568   set_process_info("accepting a local non-SMTP message from <%s>",
4569     sender_address);
4570   }
4571
4572 /* Initialize the session_local_queue-only flag (this will be ignored if
4573 mua_wrapper is set) */
4574
4575 queue_check_only();
4576 session_local_queue_only = queue_only;
4577
4578 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4579 the spool if so configured. On failure, we must not attempt to send an error
4580 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4581 error code is given.) */
4582
4583 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4584   {
4585   fprintf(stderr, "exim: insufficient disk space\n");
4586   return EXIT_FAILURE;
4587   }
4588
4589 /* If this is smtp input of any kind, real or batched, handle the start of the
4590 SMTP session.
4591
4592 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4593 because a log line has already been written for all its failure exists
4594 (usually "connection refused: <reason>") and writing another one is
4595 unnecessary clutter. */
4596
4597 if (smtp_input)
4598   {
4599   smtp_in = stdin;
4600   smtp_out = stdout;
4601   if (verify_check_host(&hosts_connection_nolog) == OK)
4602     log_write_selector &= ~L_smtp_connection;
4603   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4604   if (!smtp_start_session())
4605     {
4606     mac_smtp_fflush();
4607     exim_exit(EXIT_SUCCESS);
4608     }
4609   }
4610
4611 /* Otherwise, set up the input size limit here. */
4612
4613 else
4614   {
4615   thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4616   if (expand_string_message != NULL)
4617     {
4618     if (thismessage_size_limit == -1)
4619       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4620         "message_size_limit: %s", expand_string_message);
4621     else
4622       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4623         "message_size_limit: %s", expand_string_message);
4624     }
4625   }
4626
4627 /* Loop for several messages when reading SMTP input. If we fork any child
4628 processes, we don't want to wait for them unless synchronous delivery is
4629 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4630 same as SIG_DFL, despite the fact that documentation often lists the default as
4631 "ignore". This is a confusing area. This is what I know:
4632
4633 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4634 processes that complete simply to go away without ever becoming defunct. You
4635 can't then wait for them - but we don't want to wait for them in the
4636 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4637 happen for all OS (e.g. *BSD is different).
4638
4639 But that's not the end of the story. Some (many? all?) systems have the
4640 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4641 has by default, so it seems that the difference is merely one of default
4642 (compare restarting vs non-restarting signals).
4643
4644 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4645 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4646 of the loop below. Paranoia rules.
4647
4648 February 2003: That's *still* not the end of the story. There are now versions
4649 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4650 process then calls waitpid(), a grumble is written to the system log, because
4651 this is logically inconsistent. In other words, it doesn't like the paranoia.
4652 As a consequenc of this, the waitpid() below is now excluded if we are sure
4653 that SIG_IGN works. */
4654
4655 if (!synchronous_delivery)
4656   {
4657   #ifdef SA_NOCLDWAIT
4658   struct sigaction act;
4659   act.sa_handler = SIG_IGN;
4660   sigemptyset(&(act.sa_mask));
4661   act.sa_flags = SA_NOCLDWAIT;
4662   sigaction(SIGCHLD, &act, NULL);
4663   #else
4664   signal(SIGCHLD, SIG_IGN);
4665   #endif
4666   }
4667
4668 /* Save the current store pool point, for resetting at the start of
4669 each message, and save the real sender address, if any. */
4670
4671 reset_point = store_get(0);
4672 real_sender_address = sender_address;
4673
4674 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4675 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4676 collapsed). */
4677
4678 while (more)
4679   {
4680   store_reset(reset_point);
4681   message_id[0] = 0;
4682
4683   /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4684   input and build the recipients list, before calling receive_msg() to read the
4685   message proper. Whatever sender address is given in the SMTP transaction is
4686   often ignored for local senders - we use the actual sender, which is normally
4687   either the underlying user running this process or a -f argument provided by
4688   a trusted caller. It is saved in real_sender_address. The test for whether to
4689   accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4690
4691   if (smtp_input)
4692     {
4693     int rc;
4694     if ((rc = smtp_setup_msg()) > 0)
4695       {
4696       if (real_sender_address != NULL &&
4697           !receive_check_set_sender(sender_address))
4698         {
4699         sender_address = raw_sender = real_sender_address;
4700         sender_address_unrewritten = NULL;
4701         }
4702
4703       /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4704       isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4705       the very end. The result of the ACL is ignored (as for other non-SMTP
4706       messages). It is run for its potential side effects. */
4707
4708       if (smtp_batched_input && acl_not_smtp_start != NULL)
4709         {
4710         uschar *user_msg, *log_msg;
4711         enable_dollar_recipients = TRUE;
4712         (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4713           &user_msg, &log_msg);
4714         enable_dollar_recipients = FALSE;
4715         }
4716
4717       /* Now get the data for the message */
4718
4719       more = receive_msg(extract_recipients);
4720       if (message_id[0] == 0)
4721         {
4722         if (more) continue;
4723         smtp_log_no_mail();               /* Log no mail if configured */
4724         exim_exit(EXIT_FAILURE);
4725         }
4726       }
4727     else
4728       {
4729       smtp_log_no_mail();               /* Log no mail if configured */
4730       exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4731       }
4732     }
4733
4734   /* In the non-SMTP case, we have all the information from the command
4735   line, but must process it in case it is in the more general RFC822
4736   format, and in any case, to detect syntax errors. Also, it appears that
4737   the use of comma-separated lists as single arguments is common, so we
4738   had better support them. */
4739
4740   else
4741     {
4742     int i;
4743     int rcount = 0;
4744     int count = argc - recipients_arg;
4745     uschar **list = argv + recipients_arg;
4746
4747     /* These options cannot be changed dynamically for non-SMTP messages */
4748
4749     active_local_sender_retain = local_sender_retain;
4750     active_local_from_check = local_from_check;
4751
4752     /* Save before any rewriting */
4753
4754     raw_sender = string_copy(sender_address);
4755
4756     /* Loop for each argument */
4757
4758     for (i = 0; i < count; i++)
4759       {
4760       int start, end, domain;
4761       uschar *errmess;
4762       uschar *s = list[i];
4763
4764       /* Loop for each comma-separated address */
4765
4766       while (*s != 0)
4767         {
4768         BOOL finished = FALSE;
4769         uschar *recipient;
4770         uschar *ss = parse_find_address_end(s, FALSE);
4771
4772         if (*ss == ',') *ss = 0; else finished = TRUE;
4773
4774         /* Check max recipients - if -t was used, these aren't recipients */
4775
4776         if (recipients_max > 0 && ++rcount > recipients_max &&
4777             !extract_recipients)
4778           {
4779           if (error_handling == ERRORS_STDERR)
4780             {
4781             fprintf(stderr, "exim: too many recipients\n");
4782             exim_exit(EXIT_FAILURE);
4783             }
4784           else
4785             {
4786             return
4787               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4788                 errors_sender_rc : EXIT_FAILURE;
4789             }
4790           }
4791
4792         recipient =
4793           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4794
4795         if (domain == 0 && !allow_unqualified_recipient)
4796           {
4797           recipient = NULL;
4798           errmess = US"unqualified recipient address not allowed";
4799           }
4800
4801         if (recipient == NULL)
4802           {
4803           if (error_handling == ERRORS_STDERR)
4804             {
4805             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4806               string_printing(list[i]), errmess);
4807             exim_exit(EXIT_FAILURE);
4808             }
4809           else
4810             {
4811             error_block eblock;
4812             eblock.next = NULL;
4813             eblock.text1 = string_printing(list[i]);
4814             eblock.text2 = errmess;
4815             return
4816               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4817                 errors_sender_rc : EXIT_FAILURE;
4818             }
4819           }
4820
4821         receive_add_recipient(recipient, -1);
4822         s = ss;
4823         if (!finished)
4824           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4825         }
4826       }
4827
4828     /* Show the recipients when debugging */
4829
4830     DEBUG(D_receive)
4831       {
4832       int i;
4833       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4834       if (recipients_list != NULL)
4835         {
4836         debug_printf("Recipients:\n");
4837         for (i = 0; i < recipients_count; i++)
4838           debug_printf("  %s\n", recipients_list[i].address);
4839         }
4840       }
4841
4842     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4843     ignored; rejecting here would just add complication, and it can just as
4844     well be done later. Allow $recipients to be visible in the ACL. */
4845
4846     if (acl_not_smtp_start != NULL)
4847       {
4848       uschar *user_msg, *log_msg;
4849       enable_dollar_recipients = TRUE;
4850       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4851         &user_msg, &log_msg);
4852       enable_dollar_recipients = FALSE;
4853       }
4854
4855     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4856     will just read the headers for the message, and not write anything onto the
4857     spool. */
4858
4859     message_ended = END_NOTENDED;
4860     more = receive_msg(extract_recipients);
4861
4862     /* more is always FALSE here (not SMTP message) when reading a message
4863     for real; when reading the headers of a message for filter testing,
4864     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4865
4866     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4867     }  /* Non-SMTP message reception */
4868
4869   /* If this is a filter testing run, there are headers in store, but
4870   no message on the spool. Run the filtering code in testing mode, setting
4871   the domain to the qualify domain and the local part to the current user,
4872   unless they have been set by options. The prefix and suffix are left unset
4873   unless specified. The the return path is set to to the sender unless it has
4874   already been set from a return-path header in the message. */
4875
4876   if (filter_test != FTEST_NONE)
4877     {
4878     deliver_domain = (ftest_domain != NULL)?
4879       ftest_domain : qualify_domain_recipient;
4880     deliver_domain_orig = deliver_domain;
4881     deliver_localpart = (ftest_localpart != NULL)?
4882       ftest_localpart : originator_login;
4883     deliver_localpart_orig = deliver_localpart;
4884     deliver_localpart_prefix = ftest_prefix;
4885     deliver_localpart_suffix = ftest_suffix;
4886     deliver_home = originator_home;
4887
4888     if (return_path == NULL)
4889       {
4890       printf("Return-path copied from sender\n");
4891       return_path = string_copy(sender_address);
4892       }
4893     else
4894       {
4895       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4896       }
4897     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4898
4899     receive_add_recipient(
4900       string_sprintf("%s%s%s@%s",
4901         (ftest_prefix == NULL)? US"" : ftest_prefix,
4902         deliver_localpart,
4903         (ftest_suffix == NULL)? US"" : ftest_suffix,
4904         deliver_domain), -1);
4905
4906     printf("Recipient   = %s\n", recipients_list[0].address);
4907     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4908     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4909
4910     (void)chdir("/");   /* Get away from wherever the user is running this from */
4911
4912     /* Now we run either a system filter test, or a user filter test, or both.
4913     In the latter case, headers added by the system filter will persist and be
4914     available to the user filter. We need to copy the filter variables
4915     explicitly. */
4916
4917     if ((filter_test & FTEST_SYSTEM) != 0)
4918       {
4919       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4920         exim_exit(EXIT_FAILURE);
4921       }
4922
4923     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4924
4925     if ((filter_test & FTEST_USER) != 0)
4926       {
4927       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4928         exim_exit(EXIT_FAILURE);
4929       }
4930
4931     exim_exit(EXIT_SUCCESS);
4932     }
4933
4934   /* Else act on the result of message reception. We should not get here unless
4935   message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4936   will be TRUE. If it is not, check on the number of messages received in this
4937   connection. */
4938
4939   if (!session_local_queue_only &&
4940       smtp_accept_queue_per_connection > 0 &&
4941       receive_messagecount > smtp_accept_queue_per_connection)
4942     {
4943     session_local_queue_only = TRUE;
4944     queue_only_reason = 2;
4945     }
4946
4947   /* Initialize local_queue_only from session_local_queue_only. If it is false,
4948   and queue_only_load is set, check that the load average is below it. If it is
4949   not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4950   default), we put the whole session into queue_only mode. It then remains this
4951   way for any subsequent messages on the same SMTP connection. This is a
4952   deliberate choice; even though the load average may fall, it doesn't seem
4953   right to deliver later messages on the same call when not delivering earlier
4954   ones. However, there are odd cases where this is not wanted, so this can be
4955   changed by setting queue_only_load_latch false. */
4956
4957   local_queue_only = session_local_queue_only;
4958   if (!local_queue_only && queue_only_load >= 0)
4959     {
4960     local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4961     if (local_queue_only)
4962       {
4963       queue_only_reason = 3;
4964       if (queue_only_load_latch) session_local_queue_only = TRUE;
4965       }
4966     }
4967
4968   /* If running as an MUA wrapper, all queueing options and freezing options
4969   are ignored. */
4970
4971   if (mua_wrapper)
4972     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4973
4974   /* Log the queueing here, when it will get a message id attached, but
4975   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4976   connections). */
4977
4978   if (local_queue_only) switch(queue_only_reason)
4979     {
4980     case 2:
4981     log_write(L_delay_delivery,
4982               LOG_MAIN, "no immediate delivery: more than %d messages "
4983       "received in one connection", smtp_accept_queue_per_connection);
4984     break;
4985
4986     case 3:
4987     log_write(L_delay_delivery,
4988               LOG_MAIN, "no immediate delivery: load average %.2f",
4989               (double)load_average/1000.0);
4990     break;
4991     }
4992
4993   /* Else do the delivery unless the ACL or local_scan() called for queue only
4994   or froze the message. Always deliver in a separate process. A fork failure is
4995   not a disaster, as the delivery will eventually happen on a subsequent queue
4996   run. The search cache must be tidied before the fork, as the parent will
4997   do it before exiting. The child will trigger a lookup failure and
4998   thereby defer the delivery if it tries to use (for example) a cached ldap
4999   connection that the parent has called unbind on. */
5000
5001   else if (!queue_only_policy && !deliver_freeze)
5002     {
5003     pid_t pid;
5004     search_tidyup();
5005
5006     if ((pid = fork()) == 0)
5007       {
5008       int rc;
5009       close_unwanted();      /* Close unwanted file descriptors and TLS */
5010       exim_nullstd();        /* Ensure std{in,out,err} exist */
5011
5012       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5013       mode, deliver_drop_privilege is forced TRUE). */
5014
5015       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5016         {
5017         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5018           message_id);
5019         /* Control does not return here. */
5020         }
5021
5022       /* No need to re-exec */
5023
5024       rc = deliver_message(message_id, FALSE, FALSE);
5025       search_tidyup();
5026       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5027         EXIT_SUCCESS : EXIT_FAILURE);
5028       }
5029
5030     if (pid < 0)
5031       {
5032       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5033         "process: %s", strerror(errno));
5034       }
5035
5036     /* In the parent, wait if synchronous delivery is required. This will
5037     always be the case in MUA wrapper mode. */
5038
5039     else if (synchronous_delivery)
5040       {
5041       int status;
5042       while (wait(&status) != pid);
5043       if ((status & 0x00ff) != 0)
5044         log_write(0, LOG_MAIN|LOG_PANIC,
5045           "process %d crashed with signal %d while delivering %s",
5046           (int)pid, status & 0x00ff, message_id);
5047       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5048       }
5049     }
5050
5051   /* The loop will repeat if more is TRUE. If we do not know know that the OS
5052   automatically reaps children (see comments above the loop), clear away any
5053   finished subprocesses here, in case there are lots of messages coming in
5054   from the same source. */
5055
5056   #ifndef SIG_IGN_WORKS
5057   while (waitpid(-1, NULL, WNOHANG) > 0);
5058   #endif
5059   }
5060
5061 exim_exit(EXIT_SUCCESS);   /* Never returns */
5062 return 0;                  /* To stop compiler warning */
5063 }
5064
5065 /* End of exim.c */