src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.66 2010/06/05 11:13:29 pdp Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2009 */
   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 #ifndef DISABLE_DKIM
 909   fprintf(f, " DKIM");
 910 #endif
 911 #ifdef WITH_OLD_DEMIME
 912   fprintf(f, " Old_Demime");
 913 #endif
 914 #ifdef EXPERIMENTAL_SPF
 915   fprintf(f, " Experimental_SPF");
 916 #endif
 917 #ifdef EXPERIMENTAL_SRS
 918   fprintf(f, " Experimental_SRS");
 919 #endif
 920 #ifdef EXPERIMENTAL_BRIGHTMAIL
 921   fprintf(f, " Experimental_Brightmail");
 922 #endif
 923 #ifdef EXPERIMENTAL_DCC
 924   fprintf(f, " Experimental_DCC");
 925 #endif
 926 fprintf(f, "\n");
 927
 928 fprintf(f, "Lookups:");
 929 #ifdef LOOKUP_LSEARCH
 930   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 931 #endif
 932 #ifdef LOOKUP_CDB
 933   fprintf(f, " cdb");
 934 #endif
 935 #ifdef LOOKUP_DBM
 936   fprintf(f, " dbm dbmnz");
 937 #endif
 938 #ifdef LOOKUP_DNSDB
 939   fprintf(f, " dnsdb");
 940 #endif
 941 #ifdef LOOKUP_DSEARCH
 942   fprintf(f, " dsearch");
 943 #endif
 944 #ifdef LOOKUP_IBASE
 945   fprintf(f, " ibase");
 946 #endif
 947 #ifdef LOOKUP_LDAP
 948   fprintf(f, " ldap ldapdn ldapm");
 949 #endif
 950 #ifdef LOOKUP_MYSQL
 951   fprintf(f, " mysql");
 952 #endif
 953 #ifdef LOOKUP_NIS
 954   fprintf(f, " nis nis0");
 955 #endif
 956 #ifdef LOOKUP_NISPLUS
 957   fprintf(f, " nisplus");
 958 #endif
 959 #ifdef LOOKUP_ORACLE
 960   fprintf(f, " oracle");
 961 #endif
 962 #ifdef LOOKUP_PASSWD
 963   fprintf(f, " passwd");
 964 #endif
 965 #ifdef LOOKUP_PGSQL
 966   fprintf(f, " pgsql");
 967 #endif
 968 #ifdef LOOKUP_SQLITE
 969   fprintf(f, " sqlite");
 970 #endif
 971 #ifdef LOOKUP_TESTDB
 972   fprintf(f, " testdb");
 973 #endif
 974 #ifdef LOOKUP_WHOSON
 975   fprintf(f, " whoson");
 976 #endif
 977 fprintf(f, "\n");
 978
 979 fprintf(f, "Authenticators:");
 980 #ifdef AUTH_CRAM_MD5
 981   fprintf(f, " cram_md5");
 982 #endif
 983 #ifdef AUTH_CYRUS_SASL
 984   fprintf(f, " cyrus_sasl");
 985 #endif
 986 #ifdef AUTH_DOVECOT
 987   fprintf(f, " dovecot");
 988 #endif
 989 #ifdef AUTH_PLAINTEXT
 990   fprintf(f, " plaintext");
 991 #endif
 992 #ifdef AUTH_SPA
 993   fprintf(f, " spa");
 994 #endif
 995 fprintf(f, "\n");
 996
 997 fprintf(f, "Routers:");
 998 #ifdef ROUTER_ACCEPT
 999   fprintf(f, " accept");
1000 #endif
1001 #ifdef ROUTER_DNSLOOKUP
1002   fprintf(f, " dnslookup");
1003 #endif
1004 #ifdef ROUTER_IPLITERAL
1005   fprintf(f, " ipliteral");
1006 #endif
1007 #ifdef ROUTER_IPLOOKUP
1008   fprintf(f, " iplookup");
1009 #endif
1010 #ifdef ROUTER_MANUALROUTE
1011   fprintf(f, " manualroute");
1012 #endif
1013 #ifdef ROUTER_QUERYPROGRAM
1014   fprintf(f, " queryprogram");
1015 #endif
1016 #ifdef ROUTER_REDIRECT
1017   fprintf(f, " redirect");
1018 #endif
1019 fprintf(f, "\n");
1020
1021 fprintf(f, "Transports:");
1022 #ifdef TRANSPORT_APPENDFILE
1023   fprintf(f, " appendfile");
1024   #ifdef SUPPORT_MAILDIR
1025     fprintf(f, "/maildir");
1026   #endif
1027   #ifdef SUPPORT_MAILSTORE
1028     fprintf(f, "/mailstore");
1029   #endif
1030   #ifdef SUPPORT_MBX
1031     fprintf(f, "/mbx");
1032   #endif
1033 #endif
1034 #ifdef TRANSPORT_AUTOREPLY
1035   fprintf(f, " autoreply");
1036 #endif
1037 #ifdef TRANSPORT_LMTP
1038   fprintf(f, " lmtp");
1039 #endif
1040 #ifdef TRANSPORT_PIPE
1041   fprintf(f, " pipe");
1042 #endif
1043 #ifdef TRANSPORT_SMTP
1044   fprintf(f, " smtp");
1045 #endif
1046 fprintf(f, "\n");
1047
1048 if (fixed_never_users[0] > 0)
1049   {
1050   int i;
1051   fprintf(f, "Fixed never_users: ");
1052   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1053     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1054   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1055   }
1056
1057 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1058
1059 /* This runtime check is to help diagnose library linkage mismatches which
1060 result in segfaults and the like; as such, it's left until the end,
1061 just in case.  There will still be a "Configuration file is" line still to
1062 come. */
1063 #ifdef SUPPORT_TLS
1064 tls_version_report(f);
1065 #endif
1066 }
1067
1068
1069
1070
1071 /*************************************************
1072 *               Quote a local part               *
1073 *************************************************/
1074
1075 /* This function is used when a sender address or a From: or Sender: header
1076 line is being created from the caller's login, or from an authenticated_id. It
1077 applies appropriate quoting rules for a local part.
1078
1079 Argument:    the local part
1080 Returns:     the local part, quoted if necessary
1081 */
1082
1083 uschar *
1084 local_part_quote(uschar *lpart)
1085 {
1086 BOOL needs_quote = FALSE;
1087 int size, ptr;
1088 uschar *yield;
1089 uschar *t;
1090
1091 for (t = lpart; !needs_quote && *t != 0; t++)
1092   {
1093   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1094     (*t != '.' || t == lpart || t[1] == 0);
1095   }
1096
1097 if (!needs_quote) return lpart;
1098
1099 size = ptr = 0;
1100 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1101
1102 for (;;)
1103   {
1104   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1105   if (nq == NULL)
1106     {
1107     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1108     break;
1109     }
1110   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1111   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1112   yield = string_cat(yield, &size, &ptr, nq, 1);
1113   lpart = nq + 1;
1114   }
1115
1116 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1117 yield[ptr] = 0;
1118 return yield;
1119 }
1120
1121
1122
1123 #ifdef USE_READLINE
1124 /*************************************************
1125 *         Load readline() functions              *
1126 *************************************************/
1127
1128 /* This function is called from testing executions that read data from stdin,
1129 but only when running as the calling user. Currently, only -be does this. The
1130 function loads the readline() function library and passes back the functions.
1131 On some systems, it needs the curses library, so load that too, but try without
1132 it if loading fails. All this functionality has to be requested at build time.
1133
1134 Arguments:
1135   fn_readline_ptr   pointer to where to put the readline pointer
1136   fn_addhist_ptr    pointer to where to put the addhistory function
1137
1138 Returns:            the dlopen handle or NULL on failure
1139 */
1140
1141 static void *
1142 set_readline(char * (**fn_readline_ptr)(char *),
1143              char * (**fn_addhist_ptr)(char *))
1144 {
1145 void *dlhandle;
1146 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1147
1148 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1149 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1150
1151 if (dlhandle != NULL)
1152   {
1153   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1154   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1155   }
1156 else
1157   {
1158   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1159   }
1160
1161 return dlhandle;
1162 }
1163 #endif
1164
1165
1166
1167 /*************************************************
1168 *    Get a line from stdin for testing things    *
1169 *************************************************/
1170
1171 /* This function is called when running tests that can take a number of lines
1172 of input (for example, -be and -bt). It handles continuations and trailing
1173 spaces. And prompting and a blank line output on eof. If readline() is in use,
1174 the arguments are non-NULL and provide the relevant functions.
1175
1176 Arguments:
1177   fn_readline   readline function or NULL
1178   fn_addhist    addhist function or NULL
1179
1180 Returns:        pointer to dynamic memory, or NULL at end of file
1181 */
1182
1183 static uschar *
1184 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1185 {
1186 int i;
1187 int size = 0;
1188 int ptr = 0;
1189 uschar *yield = NULL;
1190
1191 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1192
1193 for (i = 0;; i++)
1194   {
1195   uschar buffer[1024];
1196   uschar *p, *ss;
1197
1198   #ifdef USE_READLINE
1199   char *readline_line = NULL;
1200   if (fn_readline != NULL)
1201     {
1202     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1203     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1204     p = US readline_line;
1205     }
1206   else
1207   #endif
1208
1209   /* readline() not in use */
1210
1211     {
1212     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1213     p = buffer;
1214     }
1215
1216   /* Handle the line */
1217
1218   ss = p + (int)Ustrlen(p);
1219   while (ss > p && isspace(ss[-1])) ss--;
1220
1221   if (i > 0)
1222     {
1223     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1224     }
1225
1226   yield = string_cat(yield, &size, &ptr, p, ss - p);
1227
1228   #ifdef USE_READLINE
1229   if (fn_readline != NULL) free(readline_line);
1230   #endif
1231
1232   if (ss == p || yield[ptr-1] != '\\')
1233     {
1234     yield[ptr] = 0;
1235     break;
1236     }
1237   yield[--ptr] = 0;
1238   }
1239
1240 if (yield == NULL) printf("\n");
1241 return yield;
1242 }
1243
1244
1245
1246 /*************************************************
1247 *    Output usage information for the program    *
1248 *************************************************/
1249
1250 /* This function is called when there are no recipients
1251    or a specific --help argument was added.
1252
1253 Arguments:
1254   progname      information on what name we were called by
1255
1256 Returns:        DOES NOT RETURN
1257 */
1258
1259 static void
1260 exim_usage(uschar *progname)
1261 {
1262
1263 /* Handle specific program invocation varients */
1264 if (Ustrcmp(progname, US"-mailq") == 0)
1265   {
1266   fprintf(stderr,
1267     "mailq - list the contents of the mail queue\n\n"
1268     "For a list of options, see the Exim documentation.\n");
1269   exit(EXIT_FAILURE);
1270   }
1271
1272 /* Generic usage - we output this whatever happens */
1273 fprintf(stderr,
1274   "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1275   "not directly from a shell command line. Options and/or arguments control\n"
1276   "what it does when called. For a list of options, see the Exim documentation.\n");
1277
1278 exit(EXIT_FAILURE);
1279 }
1280
1281
1282
1283 /*************************************************
1284 *          Entry point and high-level code       *
1285 *************************************************/
1286
1287 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1288 the appropriate action. All the necessary functions are present in the one
1289 binary. I originally thought one should split it up, but it turns out that so
1290 much of the apparatus is needed in each chunk that one might as well just have
1291 it all available all the time, which then makes the coding easier as well.
1292
1293 Arguments:
1294   argc      count of entries in argv
1295   argv      argument strings, with argv[0] being the program name
1296
1297 Returns:    EXIT_SUCCESS if terminated successfully
1298             EXIT_FAILURE otherwise, except when a message has been sent
1299               to the sender, and -oee was given
1300 */
1301
1302 int
1303 main(int argc, char **cargv)
1304 {
1305 uschar **argv = USS cargv;
1306 int  arg_receive_timeout = -1;
1307 int  arg_smtp_receive_timeout = -1;
1308 int  arg_error_handling = error_handling;
1309 int  filter_sfd = -1;
1310 int  filter_ufd = -1;
1311 int  group_count;
1312 int  i;
1313 int  list_queue_option = 0;
1314 int  msg_action = 0;
1315 int  msg_action_arg = -1;
1316 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1317 int  queue_only_reason = 0;
1318 #ifdef EXIM_PERL
1319 int  perl_start_option = 0;
1320 #endif
1321 int  recipients_arg = argc;
1322 int  sender_address_domain = 0;
1323 int  test_retry_arg = -1;
1324 int  test_rewrite_arg = -1;
1325 BOOL arg_queue_only = FALSE;
1326 BOOL bi_option = FALSE;
1327 BOOL checking = FALSE;
1328 BOOL count_queue = FALSE;
1329 BOOL expansion_test = FALSE;
1330 BOOL extract_recipients = FALSE;
1331 BOOL forced_delivery = FALSE;
1332 BOOL f_end_dot = FALSE;
1333 BOOL deliver_give_up = FALSE;
1334 BOOL list_queue = FALSE;
1335 BOOL list_options = FALSE;
1336 BOOL local_queue_only;
1337 BOOL more = TRUE;
1338 BOOL one_msg_action = FALSE;
1339 BOOL queue_only_set = FALSE;
1340 BOOL receiving_message = TRUE;
1341 BOOL sender_ident_set = FALSE;
1342 BOOL session_local_queue_only;
1343 BOOL unprivileged;
1344 BOOL removed_privilege = FALSE;
1345 BOOL usage_wanted = FALSE;
1346 BOOL verify_address_mode = FALSE;
1347 BOOL verify_as_sender = FALSE;
1348 BOOL version_printed = FALSE;
1349 uschar *alias_arg = NULL;
1350 uschar *called_as = US"";
1351 uschar *start_queue_run_id = NULL;
1352 uschar *stop_queue_run_id = NULL;
1353 uschar *expansion_test_message = NULL;
1354 uschar *ftest_domain = NULL;
1355 uschar *ftest_localpart = NULL;
1356 uschar *ftest_prefix = NULL;
1357 uschar *ftest_suffix = NULL;
1358 uschar *malware_test_file = NULL;
1359 uschar *real_sender_address;
1360 uschar *originator_home = US"/";
1361 void *reset_point;
1362
1363 struct passwd *pw;
1364 struct stat statbuf;
1365 pid_t passed_qr_pid = (pid_t)0;
1366 int passed_qr_pipe = -1;
1367 gid_t group_list[NGROUPS_MAX];
1368
1369 /* Possible options for -R and -S */
1370
1371 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1372
1373 /* Need to define this in case we need to change the environment in order
1374 to get rid of a bogus time zone. We have to make it char rather than uschar
1375 because some OS define it in /usr/include/unistd.h. */
1376
1377 extern char **environ;
1378
1379 /* If the Exim user and/or group and/or the configuration file owner/group were
1380 defined by ref:name at build time, we must now find the actual uid/gid values.
1381 This is a feature to make the lives of binary distributors easier. */
1382
1383 #ifdef EXIM_USERNAME
1384 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1385   {
1386   exim_gid = pw->pw_gid;
1387   }
1388 else
1389   {
1390   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1391     EXIM_USERNAME);
1392   exit(EXIT_FAILURE);
1393   }
1394 #endif
1395
1396 #ifdef EXIM_GROUPNAME
1397 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1398   {
1399   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1400     EXIM_GROUPNAME);
1401   exit(EXIT_FAILURE);
1402   }
1403 #endif
1404
1405 #ifdef CONFIGURE_OWNERNAME
1406 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1407   {
1408   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1409     CONFIGURE_OWNERNAME);
1410   exit(EXIT_FAILURE);
1411   }
1412 #endif
1413
1414 #ifdef CONFIGURE_GROUPNAME
1415 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1416   {
1417   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1418     CONFIGURE_GROUPNAME);
1419   exit(EXIT_FAILURE);
1420   }
1421 #endif
1422
1423 /* In the Cygwin environment, some initialization needs doing. It is fudged
1424 in by means of this macro. */
1425
1426 #ifdef OS_INIT
1427 OS_INIT
1428 #endif
1429
1430 /* Check a field which is patched when we are running Exim within its
1431 testing harness; do a fast initial check, and then the whole thing. */
1432
1433 running_in_test_harness =
1434   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1435
1436 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1437 at the start of a program; however, it seems that some environments do not
1438 follow this. A "strange" locale can affect the formatting of timestamps, so we
1439 make quite sure. */
1440
1441 setlocale(LC_ALL, "C");
1442
1443 /* Set up the default handler for timing using alarm(). */
1444
1445 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1446
1447 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1448 because store_malloc writes a log entry on failure. */
1449
1450 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1451 if (log_buffer == NULL)
1452   {
1453   fprintf(stderr, "exim: failed to get store for log buffer\n");
1454   exit(EXIT_FAILURE);
1455   }
1456
1457 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1458 NULL when the daemon is run and the file is closed. We have to use this
1459 indirection, because some systems don't allow writing to the variable "stderr".
1460 */
1461
1462 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1463
1464 /* Arrange for the PCRE regex library to use our store functions. Note that
1465 the normal calls are actually macros that add additional arguments for
1466 debugging purposes so we have to assign specially constructed functions here.
1467 The default is to use store in the stacking pool, but this is overridden in the
1468 regex_must_compile() function. */
1469
1470 pcre_malloc = function_store_get;
1471 pcre_free = function_dummy_free;
1472
1473 /* Ensure there is a big buffer for temporary use in several places. It is put
1474 in malloc store so that it can be freed for enlargement if necessary. */
1475
1476 big_buffer = store_malloc(big_buffer_size);
1477
1478 /* Set up the handler for the data request signal, and set the initial
1479 descriptive text. */
1480
1481 set_process_info("initializing");
1482 os_restarting_signal(SIGUSR1, usr1_handler);
1483
1484 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1485 in the daemon code. For the rest of Exim's uses, we ignore it. */
1486
1487 signal(SIGHUP, SIG_IGN);
1488
1489 /* We don't want to die on pipe errors as the code is written to handle
1490 the write error instead. */
1491
1492 signal(SIGPIPE, SIG_IGN);
1493
1494 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1495 set to SIG_IGN. This causes subprocesses that complete before the parent
1496 process waits for them not to hang around, so when Exim calls wait(), nothing
1497 is there. The wait() code has been made robust against this, but let's ensure
1498 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1499 ending status. We use sigaction rather than plain signal() on those OS where
1500 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1501 problem on AIX with this.) */
1502
1503 #ifdef SA_NOCLDWAIT
1504   {
1505   struct sigaction act;
1506   act.sa_handler = SIG_DFL;
1507   sigemptyset(&(act.sa_mask));
1508   act.sa_flags = 0;
1509   sigaction(SIGCHLD, &act, NULL);
1510   }
1511 #else
1512 signal(SIGCHLD, SIG_DFL);
1513 #endif
1514
1515 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1516 SIGHUP. */
1517
1518 sighup_argv = argv;
1519
1520 /* Set up the version number. Set up the leading 'E' for the external form of
1521 message ids, set the pointer to the internal form, and initialize it to
1522 indicate no message being processed. */
1523
1524 version_init();
1525 message_id_option[0] = '-';
1526 message_id_external = message_id_option + 1;
1527 message_id_external[0] = 'E';
1528 message_id = message_id_external + 1;
1529 message_id[0] = 0;
1530
1531 /* Set the umask to zero so that any files Exim creates using open() are
1532 created with the modes that it specifies. NOTE: Files created with fopen() have
1533 a problem, which was not recognized till rather late (February 2006). With this
1534 umask, such files will be world writeable. (They are all content scanning files
1535 in the spool directory, which isn't world-accessible, so this is not a
1536 disaster, but it's untidy.) I don't want to change this overall setting,
1537 however, because it will interact badly with the open() calls. Instead, there's
1538 now a function called modefopen() that fiddles with the umask while calling
1539 fopen(). */
1540
1541 (void)umask(0);
1542
1543 /* Precompile the regular expression for matching a message id. Keep this in
1544 step with the code that generates ids in the accept.c module. We need to do
1545 this here, because the -M options check their arguments for syntactic validity
1546 using mac_ismsgid, which uses this. */
1547
1548 regex_ismsgid =
1549   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1550
1551 /* Precompile the regular expression that is used for matching an SMTP error
1552 code, possibly extended, at the start of an error message. Note that the
1553 terminating whitespace character is included. */
1554
1555 regex_smtp_code =
1556   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1557     FALSE, TRUE);
1558
1559 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1560 this seems to be a generally accepted convention, since one finds symbolic
1561 links called "mailq" in standard OS configurations. */
1562
1563 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1564     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1565   {
1566   list_queue = TRUE;
1567   receiving_message = FALSE;
1568   called_as = US"-mailq";
1569   }
1570
1571 /* If the program is called as "rmail" treat it as equivalent to
1572 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1573 i.e. preventing a single dot on a line from terminating the message, and
1574 returning with zero return code, even in cases of error (provided an error
1575 message has been sent). */
1576
1577 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1578     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1579   {
1580   dot_ends = FALSE;
1581   called_as = US"-rmail";
1582   errors_sender_rc = EXIT_SUCCESS;
1583   }
1584
1585 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1586 this is a smail convention. */
1587
1588 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1589     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1590   {
1591   smtp_input = smtp_batched_input = TRUE;
1592   called_as = US"-rsmtp";
1593   }
1594
1595 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1596 this is a smail convention. */
1597
1598 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1599     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1600   {
1601   queue_interval = 0;
1602   receiving_message = FALSE;
1603   called_as = US"-runq";
1604   }
1605
1606 /* If the program is called as "newaliases" treat it as equivalent to
1607 "exim -bi"; this is a sendmail convention. */
1608
1609 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1610     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1611   {
1612   bi_option = TRUE;
1613   receiving_message = FALSE;
1614   called_as = US"-newaliases";
1615   }
1616
1617 /* Save the original effective uid for a couple of uses later. It should
1618 normally be root, but in some esoteric environments it may not be. */
1619
1620 original_euid = geteuid();
1621
1622 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1623 to be the same as the real ones. This makes a difference only if Exim is setuid
1624 (or setgid) to something other than root, which could be the case in some
1625 special configurations. */
1626
1627 real_uid = getuid();
1628 real_gid = getgid();
1629
1630 if (real_uid == root_uid)
1631   {
1632   setgid(real_gid);
1633   setuid(real_uid);
1634   }
1635
1636 /* If neither the original real uid nor the original euid was root, Exim is
1637 running in an unprivileged state. */
1638
1639 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1640
1641 /* If the first argument is --help, set usage_wanted and pretend there
1642 are no arguments. This will cause a brief message to be given.   We do
1643 the message generation downstream so we can pick up how we were invoked */
1644
1645 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0)
1646   {
1647   argc = 1;
1648   usage_wanted = TRUE;
1649   }
1650
1651 /* Scan the program's arguments. Some can be dealt with right away; others are
1652 simply recorded for checking and handling afterwards. Do a high-level switch
1653 on the second character (the one after '-'), to save some effort. */
1654
1655 for (i = 1; i < argc; i++)
1656   {
1657   BOOL badarg = FALSE;
1658   uschar *arg = argv[i];
1659   uschar *argrest;
1660   int switchchar;
1661
1662   /* An argument not starting with '-' is the start of a recipients list;
1663   break out of the options-scanning loop. */
1664
1665   if (arg[0] != '-')
1666     {
1667     recipients_arg = i;
1668     break;
1669     }
1670
1671   /* An option consistion of -- terminates the options */
1672
1673   if (Ustrcmp(arg, "--") == 0)
1674     {
1675     recipients_arg = i + 1;
1676     break;
1677     }
1678
1679   /* Handle flagged options */
1680
1681   switchchar = arg[1];
1682   argrest = arg+2;
1683
1684   /* Make all -ex options synonymous with -oex arguments, since that
1685   is assumed by various callers. Also make -qR options synonymous with -R
1686   options, as that seems to be required as well. Allow for -qqR too, and
1687   the same for -S options. */
1688
1689   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1690       Ustrncmp(arg+1, "qR", 2) == 0 ||
1691       Ustrncmp(arg+1, "qS", 2) == 0)
1692     {
1693     switchchar = arg[2];
1694     argrest++;
1695     }
1696   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1697     {
1698     switchchar = arg[3];
1699     argrest += 2;
1700     queue_2stage = TRUE;
1701     }
1702
1703   /* Make -r synonymous with -f, since it is a documented alias */
1704
1705   else if (arg[1] == 'r') switchchar = 'f';
1706
1707   /* Make -ov synonymous with -v */
1708
1709   else if (Ustrcmp(arg, "-ov") == 0)
1710     {
1711     switchchar = 'v';
1712     argrest++;
1713     }
1714
1715   /* High-level switch on active initial letter */
1716
1717   switch(switchchar)
1718     {
1719     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1720     so has no need of it. */
1721
1722     case 'B':
1723     if (*argrest == 0) i++;       /* Skip over the type */
1724     break;
1725
1726
1727     case 'b':
1728     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1729
1730     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1731        -bdf: Ditto, but in the foreground.
1732     */
1733
1734     if (*argrest == 'd')
1735       {
1736       daemon_listen = TRUE;
1737       if (*(++argrest) == 'f') background_daemon = FALSE;
1738         else if (*argrest != 0) { badarg = TRUE; break; }
1739       }
1740
1741     /* -be:  Run in expansion test mode
1742        -bem: Ditto, but read a message from a file first
1743     */
1744
1745     else if (*argrest == 'e')
1746       {
1747       expansion_test = checking = TRUE;
1748       if (argrest[1] == 'm')
1749         {
1750         if (++i >= argc) { badarg = TRUE; break; }
1751         expansion_test_message = argv[i];
1752         argrest++;
1753         }
1754       if (argrest[1] != 0) { badarg = TRUE; break; }
1755       }
1756
1757     /* -bF:  Run system filter test */
1758
1759     else if (*argrest == 'F')
1760       {
1761       filter_test |= FTEST_SYSTEM;
1762       if (*(++argrest) != 0) { badarg = TRUE; break; }
1763       if (++i < argc) filter_test_sfile = argv[i]; else
1764         {
1765         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1766         exit(EXIT_FAILURE);
1767         }
1768       }
1769
1770     /* -bf:  Run user filter test
1771        -bfd: Set domain for filter testing
1772        -bfl: Set local part for filter testing
1773        -bfp: Set prefix for filter testing
1774        -bfs: Set suffix for filter testing
1775     */
1776
1777     else if (*argrest == 'f')
1778       {
1779       if (*(++argrest) == 0)
1780         {
1781         filter_test |= FTEST_USER;
1782         if (++i < argc) filter_test_ufile = argv[i]; else
1783           {
1784           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1785           exit(EXIT_FAILURE);
1786           }
1787         }
1788       else
1789         {
1790         if (++i >= argc)
1791           {
1792           fprintf(stderr, "exim: string expected after %s\n", arg);
1793           exit(EXIT_FAILURE);
1794           }
1795         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1796         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1797         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1798         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1799         else { badarg = TRUE; break; }
1800         }
1801       }
1802
1803     /* -bh: Host checking - an IP address must follow. */
1804
1805     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1806       {
1807       if (++i >= argc) { badarg = TRUE; break; }
1808       sender_host_address = argv[i];
1809       host_checking = checking = log_testing_mode = TRUE;
1810       host_checking_callout = argrest[1] == 'c';
1811       }
1812
1813     /* -bi: This option is used by sendmail to initialize *the* alias file,
1814     though it has the -oA option to specify a different file. Exim has no
1815     concept of *the* alias file, but since Sun's YP make script calls
1816     sendmail this way, some support must be provided. */
1817
1818     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1819
1820     /* -bm: Accept and deliver message - the default option. Reinstate
1821     receiving_message, which got turned off for all -b options. */
1822
1823     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1824
1825     /* -bmalware: test the filename given for malware */
1826
1827     else if (Ustrcmp(argrest, "malware") == 0)
1828       {
1829       if (++i >= argc) { badarg = TRUE; break; }
1830       malware_test_file = argv[i];
1831       }
1832
1833     /* -bnq: For locally originating messages, do not qualify unqualified
1834     addresses. In the envelope, this causes errors; in header lines they
1835     just get left. */
1836
1837     else if (Ustrcmp(argrest, "nq") == 0)
1838       {
1839       allow_unqualified_sender = FALSE;
1840       allow_unqualified_recipient = FALSE;
1841       }
1842
1843     /* -bpxx: List the contents of the mail queue, in various forms. If
1844     the option is -bpc, just a queue count is needed. Otherwise, if the
1845     first letter after p is r, then order is random. */
1846
1847     else if (*argrest == 'p')
1848       {
1849       if (*(++argrest) == 'c')
1850         {
1851         count_queue = TRUE;
1852         if (*(++argrest) != 0) badarg = TRUE;
1853         break;
1854         }
1855
1856       if (*argrest == 'r')
1857         {
1858         list_queue_option = 8;
1859         argrest++;
1860         }
1861       else list_queue_option = 0;
1862
1863       list_queue = TRUE;
1864
1865       /* -bp: List the contents of the mail queue, top-level only */
1866
1867       if (*argrest == 0) {}
1868
1869       /* -bpu: List the contents of the mail queue, top-level undelivered */
1870
1871       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1872
1873       /* -bpa: List the contents of the mail queue, including all delivered */
1874
1875       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1876
1877       /* Unknown after -bp[r] */
1878
1879       else
1880         {
1881         badarg = TRUE;
1882         break;
1883         }
1884       }
1885
1886
1887     /* -bP: List the configuration variables given as the address list.
1888     Force -v, so configuration errors get displayed. */
1889
1890     else if (Ustrcmp(argrest, "P") == 0)
1891       {
1892       list_options = TRUE;
1893       debug_selector |= D_v;
1894       debug_file = stderr;
1895       }
1896
1897     /* -brt: Test retry configuration lookup */
1898
1899     else if (Ustrcmp(argrest, "rt") == 0)
1900       {
1901       test_retry_arg = i + 1;
1902       goto END_ARG;
1903       }
1904
1905     /* -brw: Test rewrite configuration */
1906
1907     else if (Ustrcmp(argrest, "rw") == 0)
1908       {
1909       test_rewrite_arg = i + 1;
1910       goto END_ARG;
1911       }
1912
1913     /* -bS: Read SMTP commands on standard input, but produce no replies -
1914     all errors are reported by sending messages. */
1915
1916     else if (Ustrcmp(argrest, "S") == 0)
1917       smtp_input = smtp_batched_input = receiving_message = TRUE;
1918
1919     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1920     on standard output. */
1921
1922     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1923
1924     /* -bt: address testing mode */
1925
1926     else if (Ustrcmp(argrest, "t") == 0)
1927       address_test_mode = checking = log_testing_mode = TRUE;
1928
1929     /* -bv: verify addresses */
1930
1931     else if (Ustrcmp(argrest, "v") == 0)
1932       verify_address_mode = checking = log_testing_mode = TRUE;
1933
1934     /* -bvs: verify sender addresses */
1935
1936     else if (Ustrcmp(argrest, "vs") == 0)
1937       {
1938       verify_address_mode = checking = log_testing_mode = TRUE;
1939       verify_as_sender = TRUE;
1940       }
1941
1942     /* -bV: Print version string and support details */
1943
1944     else if (Ustrcmp(argrest, "V") == 0)
1945       {
1946       printf("Exim version %s #%s built %s\n", version_string,
1947         version_cnumber, version_date);
1948       printf("%s\n", CS version_copyright);
1949       version_printed = TRUE;
1950       show_whats_supported(stdout);
1951       }
1952
1953     else badarg = TRUE;
1954     break;
1955
1956
1957     /* -C: change configuration file list; ignore if it isn't really
1958     a change! Enforce a prefix check if required. */
1959
1960     case 'C':
1961     if (*argrest == 0)
1962       {
1963       if(++i < argc) argrest = argv[i]; else
1964         { badarg = TRUE; break; }
1965       }
1966     if (Ustrcmp(config_main_filelist, argrest) != 0)
1967       {
1968       #ifdef ALT_CONFIG_PREFIX
1969       int sep = 0;
1970       int len = Ustrlen(ALT_CONFIG_PREFIX);
1971       uschar *list = argrest;
1972       uschar *filename;
1973       while((filename = string_nextinlist(&list, &sep, big_buffer,
1974              big_buffer_size)) != NULL)
1975         {
1976         if ((Ustrlen(filename) < len ||
1977              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1978              Ustrstr(filename, "/../") != NULL) &&
1979              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1980           {
1981           fprintf(stderr, "-C Permission denied\n");
1982           exit(EXIT_FAILURE);
1983           }
1984         }
1985       #endif
1986
1987       config_main_filelist = argrest;
1988       config_changed = TRUE;
1989       }
1990     break;
1991
1992
1993     /* -D: set up a macro definition */
1994
1995     case 'D':
1996     #ifdef DISABLE_D_OPTION
1997     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1998     exit(EXIT_FAILURE);
1999     #else
2000       {
2001       int ptr = 0;
2002       macro_item *mlast = NULL;
2003       macro_item *m;
2004       uschar name[24];
2005       uschar *s = argrest;
2006
2007       while (isspace(*s)) s++;
2008
2009       if (*s < 'A' || *s > 'Z')
2010         {
2011         fprintf(stderr, "exim: macro name set by -D must start with "
2012           "an upper case letter\n");
2013         exit(EXIT_FAILURE);
2014         }
2015
2016       while (isalnum(*s) || *s == '_')
2017         {
2018         if (ptr < sizeof(name)-1) name[ptr++] = *s;
2019         s++;
2020         }
2021       name[ptr] = 0;
2022       if (ptr == 0) { badarg = TRUE; break; }
2023       while (isspace(*s)) s++;
2024       if (*s != 0)
2025         {
2026         if (*s++ != '=') { badarg = TRUE; break; }
2027         while (isspace(*s)) s++;
2028         }
2029
2030       for (m = macros; m != NULL; m = m->next)
2031         {
2032         if (Ustrcmp(m->name, name) == 0)
2033           {
2034           fprintf(stderr, "exim: duplicated -D in command line\n");
2035           exit(EXIT_FAILURE);
2036           }
2037         mlast = m;
2038         }
2039
2040       m = store_get(sizeof(macro_item) + Ustrlen(name));
2041       m->next = NULL;
2042       m->command_line = TRUE;
2043       if (mlast == NULL) macros = m; else mlast->next = m;
2044       Ustrcpy(m->name, name);
2045       m->replacement = string_copy(s);
2046
2047       if (clmacro_count >= MAX_CLMACROS)
2048         {
2049         fprintf(stderr, "exim: too many -D options on command line\n");
2050         exit(EXIT_FAILURE);
2051         }
2052       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2053         m->replacement);
2054       }
2055     #endif
2056     break;
2057
2058     /* -d: Set debug level (see also -v below) or set the drop_cr option.
2059     The latter is now a no-op, retained for compatibility only. If -dd is used,
2060     debugging subprocesses of the daemon is disabled. */
2061
2062     case 'd':
2063     if (Ustrcmp(argrest, "ropcr") == 0)
2064       {
2065       /* drop_cr = TRUE; */
2066       }
2067
2068     /* Use an intermediate variable so that we don't set debugging while
2069     decoding the debugging bits. */
2070
2071     else
2072       {
2073       unsigned int selector = D_default;
2074       debug_selector = 0;
2075       debug_file = NULL;
2076       if (*argrest == 'd')
2077         {
2078         debug_daemon = TRUE;
2079         argrest++;
2080         }
2081       if (*argrest != 0)
2082         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2083           debug_options_count, US"debug");
2084       debug_selector = selector;
2085       }
2086     break;
2087
2088
2089     /* -E: This is a local error message. This option is not intended for
2090     external use at all, but is not restricted to trusted callers because it
2091     does no harm (just suppresses certain error messages) and if Exim is run
2092     not setuid root it won't always be trusted when it generates error
2093     messages using this option. If there is a message id following -E, point
2094     message_reference at it, for logging. */
2095
2096     case 'E':
2097     local_error_message = TRUE;
2098     if (mac_ismsgid(argrest)) message_reference = argrest;
2099     break;
2100
2101
2102     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2103     option, so it looks as if historically the -oex options are also callable
2104     without the leading -o. So we have to accept them. Before the switch,
2105     anything starting -oe has been converted to -e. Exim does not support all
2106     of the sendmail error options. */
2107
2108     case 'e':
2109     if (Ustrcmp(argrest, "e") == 0)
2110       {
2111       arg_error_handling = ERRORS_SENDER;
2112       errors_sender_rc = EXIT_SUCCESS;
2113       }
2114     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2115     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2116     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2117     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2118     else badarg = TRUE;
2119     break;
2120
2121
2122     /* -F: Set sender's full name, used instead of the gecos entry from
2123     the password file. Since users can usually alter their gecos entries,
2124     there's no security involved in using this instead. The data can follow
2125     the -F or be in the next argument. */
2126
2127     case 'F':
2128     if (*argrest == 0)
2129       {
2130       if(++i < argc) argrest = argv[i]; else
2131         { badarg = TRUE; break; }
2132       }
2133     originator_name = argrest;
2134     sender_name_forced = TRUE;
2135     break;
2136
2137
2138     /* -f: Set sender's address - this value is only actually used if Exim is
2139     run by a trusted user, or if untrusted_set_sender is set and matches the
2140     address, except that the null address can always be set by any user. The
2141     test for this happens later, when the value given here is ignored when not
2142     permitted. For an untrusted user, the actual sender is still put in Sender:
2143     if it doesn't match the From: header (unless no_local_from_check is set).
2144     The data can follow the -f or be in the next argument. The -r switch is an
2145     obsolete form of -f but since there appear to be programs out there that
2146     use anything that sendmail has ever supported, better accept it - the
2147     synonymizing is done before the switch above.
2148
2149     At this stage, we must allow domain literal addresses, because we don't
2150     know what the setting of allow_domain_literals is yet. Ditto for trailing
2151     dots and strip_trailing_dot. */
2152
2153     case 'f':
2154       {
2155       int start, end;
2156       uschar *errmess;
2157       if (*argrest == 0)
2158         {
2159         if (i+1 < argc) argrest = argv[++i]; else
2160           { badarg = TRUE; break; }
2161         }
2162       if (*argrest == 0)
2163         {
2164         sender_address = string_sprintf("");  /* Ensure writeable memory */
2165         }
2166       else
2167         {
2168         uschar *temp = argrest + Ustrlen(argrest) - 1;
2169         while (temp >= argrest && isspace(*temp)) temp--;
2170         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2171         allow_domain_literals = TRUE;
2172         strip_trailing_dot = TRUE;
2173         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2174           &sender_address_domain, TRUE);
2175         allow_domain_literals = FALSE;
2176         strip_trailing_dot = FALSE;
2177         if (sender_address == NULL)
2178           {
2179           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2180           return EXIT_FAILURE;
2181           }
2182         }
2183       sender_address_forced = TRUE;
2184       }
2185     break;
2186
2187     /* This is some Sendmail thing which can be ignored */
2188
2189     case 'G':
2190     break;
2191
2192     /* -h: Set the hop count for an incoming message. Exim does not currently
2193     support this; it always computes it by counting the Received: headers.
2194     To put it in will require a change to the spool header file format. */
2195
2196     case 'h':
2197     if (*argrest == 0)
2198       {
2199       if(++i < argc) argrest = argv[i]; else
2200         { badarg = TRUE; break; }
2201       }
2202     if (!isdigit(*argrest)) badarg = TRUE;
2203     break;
2204
2205
2206     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2207     not to be documented for sendmail but mailx (at least) uses it) */
2208
2209     case 'i':
2210     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2211     break;
2212
2213
2214     case 'M':
2215     receiving_message = FALSE;
2216
2217     /* -MC:  continue delivery of another message via an existing open
2218     file descriptor. This option is used for an internal call by the
2219     smtp transport when there is a pending message waiting to go to an
2220     address to which it has got a connection. Five subsequent arguments are
2221     required: transport name, host name, IP address, sequence number, and
2222     message_id. Transports may decline to create new processes if the sequence
2223     number gets too big. The channel is stdin. This (-MC) must be the last
2224     argument. There's a subsequent check that the real-uid is privileged.
2225
2226     If we are running in the test harness. delay for a bit, to let the process
2227     that set this one up complete. This makes for repeatability of the logging,
2228     etc. output. */
2229
2230     if (Ustrcmp(argrest, "C") == 0)
2231       {
2232       union sockaddr_46 interface_sock;
2233       EXIM_SOCKLEN_T size = sizeof(interface_sock);
2234
2235       if (argc != i + 6)
2236         {
2237         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2238         return EXIT_FAILURE;
2239         }
2240
2241       if (msg_action_arg >= 0)
2242         {
2243         fprintf(stderr, "exim: incompatible arguments\n");
2244         return EXIT_FAILURE;
2245         }
2246
2247       continue_transport = argv[++i];
2248       continue_hostname = argv[++i];
2249       continue_host_address = argv[++i];
2250       continue_sequence = Uatoi(argv[++i]);
2251       msg_action = MSG_DELIVER;
2252       msg_action_arg = ++i;
2253       forced_delivery = TRUE;
2254       queue_run_pid = passed_qr_pid;
2255       queue_run_pipe = passed_qr_pipe;
2256
2257       if (!mac_ismsgid(argv[i]))
2258         {
2259         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2260           argv[i]);
2261         return EXIT_FAILURE;
2262         }
2263
2264       /* Set up $sending_ip_address and $sending_port */
2265
2266       if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2267           &size) == 0)
2268         sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2269           &sending_port);
2270       else
2271         {
2272         fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2273           strerror(errno));
2274         return EXIT_FAILURE;
2275         }
2276
2277       if (running_in_test_harness) millisleep(500);
2278       break;
2279       }
2280
2281     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2282     precedes -MC (see above). The flag indicates that the host to which
2283     Exim is connected has accepted an AUTH sequence. */
2284
2285     else if (Ustrcmp(argrest, "CA") == 0)
2286       {
2287       smtp_authenticated = TRUE;
2288       break;
2289       }
2290
2291     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2292     it preceded -MC (see above) */
2293
2294     else if (Ustrcmp(argrest, "CP") == 0)
2295       {
2296       smtp_use_pipelining = TRUE;
2297       break;
2298       }
2299
2300     /* -MCQ: pass on the pid of the queue-running process that started
2301     this chain of deliveries and the fd of its synchronizing pipe; this
2302     is useful only when it precedes -MC (see above) */
2303
2304     else if (Ustrcmp(argrest, "CQ") == 0)
2305       {
2306       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2307         else badarg = TRUE;
2308       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2309         else badarg = TRUE;
2310       break;
2311       }
2312
2313     /* -MCS: set the smtp_use_size flag; this is useful only when it
2314     precedes -MC (see above) */
2315
2316     else if (Ustrcmp(argrest, "CS") == 0)
2317       {
2318       smtp_use_size = TRUE;
2319       break;
2320       }
2321
2322     /* -MCT: set the tls_offered flag; this is useful only when it
2323     precedes -MC (see above). The flag indicates that the host to which
2324     Exim is connected has offered TLS support. */
2325
2326     #ifdef SUPPORT_TLS
2327     else if (Ustrcmp(argrest, "CT") == 0)
2328       {
2329       tls_offered = TRUE;
2330       break;
2331       }
2332     #endif
2333
2334     /* -M[x]: various operations on the following list of message ids:
2335        -M    deliver the messages, ignoring next retry times and thawing
2336        -Mc   deliver the messages, checking next retry times, no thawing
2337        -Mf   freeze the messages
2338        -Mg   give up on the messages
2339        -Mt   thaw the messages
2340        -Mrm  remove the messages
2341     In the above cases, this must be the last option. There are also the
2342     following options which are followed by a single message id, and which
2343     act on that message. Some of them use the "recipient" addresses as well.
2344        -Mar  add recipient(s)
2345        -Mmad mark all recipients delivered
2346        -Mmd  mark recipients(s) delivered
2347        -Mes  edit sender
2348        -Mset load a message for use with -be
2349        -Mvb  show body
2350        -Mvc  show copy (of whole message, in RFC 2822 format)
2351        -Mvh  show header
2352        -Mvl  show log
2353     */
2354
2355     else if (*argrest == 0)
2356       {
2357       msg_action = MSG_DELIVER;
2358       forced_delivery = deliver_force_thaw = TRUE;
2359       }
2360     else if (Ustrcmp(argrest, "ar") == 0)
2361       {
2362       msg_action = MSG_ADD_RECIPIENT;
2363       one_msg_action = TRUE;
2364       }
2365     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2366     else if (Ustrcmp(argrest, "es") == 0)
2367       {
2368       msg_action = MSG_EDIT_SENDER;
2369       one_msg_action = TRUE;
2370       }
2371     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2372     else if (Ustrcmp(argrest, "g") == 0)
2373       {
2374       msg_action = MSG_DELIVER;
2375       deliver_give_up = TRUE;
2376       }
2377     else if (Ustrcmp(argrest, "mad") == 0)
2378       {
2379       msg_action = MSG_MARK_ALL_DELIVERED;
2380       }
2381     else if (Ustrcmp(argrest, "md") == 0)
2382       {
2383       msg_action = MSG_MARK_DELIVERED;
2384       one_msg_action = TRUE;
2385       }
2386     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2387     else if (Ustrcmp(argrest, "set") == 0)
2388       {
2389       msg_action = MSG_LOAD;
2390       one_msg_action = TRUE;
2391       }
2392     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2393     else if (Ustrcmp(argrest, "vb") == 0)
2394       {
2395       msg_action = MSG_SHOW_BODY;
2396       one_msg_action = TRUE;
2397       }
2398     else if (Ustrcmp(argrest, "vc") == 0)
2399       {
2400       msg_action = MSG_SHOW_COPY;
2401       one_msg_action = TRUE;
2402       }
2403     else if (Ustrcmp(argrest, "vh") == 0)
2404       {
2405       msg_action = MSG_SHOW_HEADER;
2406       one_msg_action = TRUE;
2407       }
2408     else if (Ustrcmp(argrest, "vl") == 0)
2409       {
2410       msg_action = MSG_SHOW_LOG;
2411       one_msg_action = TRUE;
2412       }
2413     else { badarg = TRUE; break; }
2414
2415     /* All the -Mxx options require at least one message id. */
2416
2417     msg_action_arg = i + 1;
2418     if (msg_action_arg >= argc)
2419       {
2420       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2421       return EXIT_FAILURE;
2422       }
2423
2424     /* Some require only message ids to follow */
2425
2426     if (!one_msg_action)
2427       {
2428       int j;
2429       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2430         {
2431         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2432           argv[j], arg);
2433         return EXIT_FAILURE;
2434         }
2435       goto END_ARG;   /* Remaining args are ids */
2436       }
2437
2438     /* Others require only one message id, possibly followed by addresses,
2439     which will be handled as normal arguments. */
2440
2441     else
2442       {
2443       if (!mac_ismsgid(argv[msg_action_arg]))
2444         {
2445         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2446           argv[msg_action_arg], arg);
2447         return EXIT_FAILURE;
2448         }
2449       i++;
2450       }
2451     break;
2452
2453
2454     /* Some programs seem to call the -om option without the leading o;
2455     for sendmail it askes for "me too". Exim always does this. */
2456
2457     case 'm':
2458     if (*argrest != 0) badarg = TRUE;
2459     break;
2460
2461
2462     /* -N: don't do delivery - a debugging option that stops transports doing
2463     their thing. It implies debugging at the D_v level. */
2464
2465     case 'N':
2466     if (*argrest == 0)
2467       {
2468       dont_deliver = TRUE;
2469       debug_selector |= D_v;
2470       debug_file = stderr;
2471       }
2472     else badarg = TRUE;
2473     break;
2474
2475
2476     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2477     it. */
2478
2479     case 'n':
2480     break;
2481
2482     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2483     option to the specified value. This form uses long names. We need to handle
2484     -O option=value and -Ooption=value. */
2485
2486     case 'O':
2487     if (*argrest == 0)
2488       {
2489       if (++i >= argc)
2490         {
2491         fprintf(stderr, "exim: string expected after -O\n");
2492         exit(EXIT_FAILURE);
2493         }
2494       }
2495     break;
2496
2497     case 'o':
2498
2499     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2500     file" option). */
2501
2502     if (*argrest == 'A')
2503       {
2504       alias_arg = argrest + 1;
2505       if (alias_arg[0] == 0)
2506         {
2507         if (i+1 < argc) alias_arg = argv[++i]; else
2508           {
2509           fprintf(stderr, "exim: string expected after -oA\n");
2510           exit(EXIT_FAILURE);
2511           }
2512         }
2513       }
2514
2515     /* -oB: Set a connection message max value for remote deliveries */
2516
2517     else if (*argrest == 'B')
2518       {
2519       uschar *p = argrest + 1;
2520       if (p[0] == 0)
2521         {
2522         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2523           {
2524           connection_max_messages = 1;
2525           p = NULL;
2526           }
2527         }
2528
2529       if (p != NULL)
2530         {
2531         if (!isdigit(*p))
2532           {
2533           fprintf(stderr, "exim: number expected after -oB\n");
2534           exit(EXIT_FAILURE);
2535           }
2536         connection_max_messages = Uatoi(p);
2537         }
2538       }
2539
2540     /* -odb: background delivery */
2541
2542     else if (Ustrcmp(argrest, "db") == 0)
2543       {
2544       synchronous_delivery = FALSE;
2545       arg_queue_only = FALSE;
2546       queue_only_set = TRUE;
2547       }
2548
2549     /* -odf: foreground delivery (smail-compatible option); same effect as
2550        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2551     */
2552
2553     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2554       {
2555       synchronous_delivery = TRUE;
2556       arg_queue_only = FALSE;
2557       queue_only_set = TRUE;
2558       }
2559
2560     /* -odq: queue only */
2561
2562     else if (Ustrcmp(argrest, "dq") == 0)
2563       {
2564       synchronous_delivery = FALSE;
2565       arg_queue_only = TRUE;
2566       queue_only_set = TRUE;
2567       }
2568
2569     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2570     but no remote delivery */
2571
2572     else if (Ustrcmp(argrest, "dqs") == 0)
2573       {
2574       queue_smtp = TRUE;
2575       arg_queue_only = FALSE;
2576       queue_only_set = TRUE;
2577       }
2578
2579     /* -oex: Sendmail error flags. As these are also accepted without the
2580     leading -o prefix, for compatibility with vacation and other callers,
2581     they are handled with -e above. */
2582
2583     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2584        -oitrue: Another sendmail syntax for the same */
2585
2586     else if (Ustrcmp(argrest, "i") == 0 ||
2587              Ustrcmp(argrest, "itrue") == 0)
2588       dot_ends = FALSE;
2589
2590     /* -oM*: Set various characteristics for an incoming message; actually
2591     acted on for trusted callers only. */
2592
2593     else if (*argrest == 'M')
2594       {
2595       if (i+1 >= argc)
2596         {
2597         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2598         exit(EXIT_FAILURE);
2599         }
2600
2601       /* -oMa: Set sender host address */
2602
2603       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2604
2605       /* -oMaa: Set authenticator name */
2606
2607       else if (Ustrcmp(argrest, "Maa") == 0)
2608         sender_host_authenticated = argv[++i];
2609
2610       /* -oMas: setting authenticated sender */
2611
2612       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2613
2614       /* -oMai: setting authenticated id */
2615
2616       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2617
2618       /* -oMi: Set incoming interface address */
2619
2620       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2621
2622       /* -oMr: Received protocol */
2623
2624       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2625
2626       /* -oMs: Set sender host name */
2627
2628       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2629
2630       /* -oMt: Set sender ident */
2631
2632       else if (Ustrcmp(argrest, "Mt") == 0)
2633         {
2634         sender_ident_set = TRUE;
2635         sender_ident = argv[++i];
2636         }
2637
2638       /* Else a bad argument */
2639
2640       else
2641         {
2642         badarg = TRUE;
2643         break;
2644         }
2645       }
2646
2647     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2648     seem to call this as -m (undocumented), so that is also accepted (see
2649     above). */
2650
2651     else if (Ustrcmp(argrest, "m") == 0) {}
2652
2653     /* -oo: An ancient flag for old-style addresses which still seems to
2654     crop up in some calls (see in SCO). */
2655
2656     else if (Ustrcmp(argrest, "o") == 0) {}
2657
2658     /* -oP <name>: set pid file path for daemon */
2659
2660     else if (Ustrcmp(argrest, "P") == 0)
2661       override_pid_file_path = argv[++i];
2662
2663     /* -or <n>: set timeout for non-SMTP acceptance
2664        -os <n>: set timeout for SMTP acceptance */
2665
2666     else if (*argrest == 'r' || *argrest == 's')
2667       {
2668       int *tp = (*argrest == 'r')?
2669         &arg_receive_timeout : &arg_smtp_receive_timeout;
2670       if (argrest[1] == 0)
2671         {
2672         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2673         }
2674       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2675       if (*tp < 0)
2676         {
2677         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2678         exit(EXIT_FAILURE);
2679         }
2680       }
2681
2682     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2683
2684     else if (Ustrcmp(argrest, "X") == 0)
2685       override_local_interfaces = argv[++i];
2686
2687     /* Unknown -o argument */
2688
2689     else badarg = TRUE;
2690     break;
2691
2692
2693     /* -ps: force Perl startup; -pd force delayed Perl startup */
2694
2695     case 'p':
2696     #ifdef EXIM_PERL
2697     if (*argrest == 's' && argrest[1] == 0)
2698       {
2699       perl_start_option = 1;
2700       break;
2701       }
2702     if (*argrest == 'd' && argrest[1] == 0)
2703       {
2704       perl_start_option = -1;
2705       break;
2706       }
2707     #endif
2708
2709     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2710     which sets the host protocol and host name */
2711
2712     if (*argrest == 0)
2713       {
2714       if (i+1 < argc) argrest = argv[++i]; else
2715         { badarg = TRUE; break; }
2716       }
2717
2718     if (*argrest != 0)
2719       {
2720       uschar *hn = Ustrchr(argrest, ':');
2721       if (hn == NULL)
2722         {
2723         received_protocol = argrest;
2724         }
2725       else
2726         {
2727         received_protocol = string_copyn(argrest, hn - argrest);
2728         sender_host_name = hn + 1;
2729         }
2730       }
2731     break;
2732
2733
2734     case 'q':
2735     receiving_message = FALSE;
2736     if (queue_interval >= 0)
2737       {
2738       fprintf(stderr, "exim: -q specified more than once\n");
2739       exit(EXIT_FAILURE);
2740       }
2741
2742     /* -qq...: Do queue runs in a 2-stage manner */
2743
2744     if (*argrest == 'q')
2745       {
2746       queue_2stage = TRUE;
2747       argrest++;
2748       }
2749
2750     /* -qi...: Do only first (initial) deliveries */
2751
2752     if (*argrest == 'i')
2753       {
2754       queue_run_first_delivery = TRUE;
2755       argrest++;
2756       }
2757
2758     /* -qf...: Run the queue, forcing deliveries
2759        -qff..: Ditto, forcing thawing as well */
2760
2761     if (*argrest == 'f')
2762       {
2763       queue_run_force = TRUE;
2764       if (*(++argrest) == 'f')
2765         {
2766         deliver_force_thaw = TRUE;
2767         argrest++;
2768         }
2769       }
2770
2771     /* -q[f][f]l...: Run the queue only on local deliveries */
2772
2773     if (*argrest == 'l')
2774       {
2775       queue_run_local = TRUE;
2776       argrest++;
2777       }
2778
2779     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2780     optionally starting from a given message id. */
2781
2782     if (*argrest == 0 &&
2783         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2784       {
2785       queue_interval = 0;
2786       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2787         start_queue_run_id = argv[++i];
2788       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2789         stop_queue_run_id = argv[++i];
2790       }
2791
2792     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2793     optionally local only. */
2794
2795     else
2796       {
2797       if (*argrest != 0)
2798         queue_interval = readconf_readtime(argrest, 0, FALSE);
2799       else
2800         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2801       if (queue_interval <= 0)
2802         {
2803         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2804         exit(EXIT_FAILURE);
2805         }
2806       }
2807     break;
2808
2809
2810     case 'R':   /* Synonymous with -qR... */
2811     receiving_message = FALSE;
2812
2813     /* -Rf:   As -R (below) but force all deliveries,
2814        -Rff:  Ditto, but also thaw all frozen messages,
2815        -Rr:   String is regex
2816        -Rrf:  Regex and force
2817        -Rrff: Regex and force and thaw
2818
2819     in all cases provided there are no further characters in this
2820     argument. */
2821
2822     if (*argrest != 0)
2823       {
2824       int i;
2825       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2826         {
2827         if (Ustrcmp(argrest, rsopts[i]) == 0)
2828           {
2829           if (i != 2) queue_run_force = TRUE;
2830           if (i >= 2) deliver_selectstring_regex = TRUE;
2831           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2832           argrest += Ustrlen(rsopts[i]);
2833           }
2834         }
2835       }
2836
2837     /* -R: Set string to match in addresses for forced queue run to
2838     pick out particular messages. */
2839
2840     if (*argrest == 0)
2841       {
2842       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2843         {
2844         fprintf(stderr, "exim: string expected after -R\n");
2845         exit(EXIT_FAILURE);
2846         }
2847       }
2848     else deliver_selectstring = argrest;
2849     break;
2850
2851
2852     /* -r: an obsolete synonym for -f (see above) */
2853
2854
2855     /* -S: Like -R but works on sender. */
2856
2857     case 'S':   /* Synonymous with -qS... */
2858     receiving_message = FALSE;
2859
2860     /* -Sf:   As -S (below) but force all deliveries,
2861        -Sff:  Ditto, but also thaw all frozen messages,
2862        -Sr:   String is regex
2863        -Srf:  Regex and force
2864        -Srff: Regex and force and thaw
2865
2866     in all cases provided there are no further characters in this
2867     argument. */
2868
2869     if (*argrest != 0)
2870       {
2871       int i;
2872       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2873         {
2874         if (Ustrcmp(argrest, rsopts[i]) == 0)
2875           {
2876           if (i != 2) queue_run_force = TRUE;
2877           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2878           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2879           argrest += Ustrlen(rsopts[i]);
2880           }
2881         }
2882       }
2883
2884     /* -S: Set string to match in addresses for forced queue run to
2885     pick out particular messages. */
2886
2887     if (*argrest == 0)
2888       {
2889       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2890         {
2891         fprintf(stderr, "exim: string expected after -S\n");
2892         exit(EXIT_FAILURE);
2893         }
2894       }
2895     else deliver_selectstring_sender = argrest;
2896     break;
2897
2898     /* -Tqt is an option that is exclusively for use by the testing suite.
2899     It is not recognized in other circumstances. It allows for the setting up
2900     of explicit "queue times" so that various warning/retry things can be
2901     tested. Otherwise variability of clock ticks etc. cause problems. */
2902
2903     case 'T':
2904     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2905       fudged_queue_times = argv[++i];
2906     else badarg = TRUE;
2907     break;
2908
2909
2910     /* -t: Set flag to extract recipients from body of message. */
2911
2912     case 't':
2913     if (*argrest == 0) extract_recipients = TRUE;
2914
2915     /* -ti: Set flag to extract recipients from body of message, and also
2916     specify that dot does not end the message. */
2917
2918     else if (Ustrcmp(argrest, "i") == 0)
2919       {
2920       extract_recipients = TRUE;
2921       dot_ends = FALSE;
2922       }
2923
2924     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2925
2926     #ifdef SUPPORT_TLS
2927     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2928     #endif
2929
2930     else badarg = TRUE;
2931     break;
2932
2933
2934     /* -U: This means "initial user submission" in sendmail, apparently. The
2935     doc claims that in future sendmail may refuse syntactically invalid
2936     messages instead of fixing them. For the moment, we just ignore it. */
2937
2938     case 'U':
2939     break;
2940
2941
2942     /* -v: verify things - this is a very low-level debugging */
2943
2944     case 'v':
2945     if (*argrest == 0)
2946       {
2947       debug_selector |= D_v;
2948       debug_file = stderr;
2949       }
2950     else badarg = TRUE;
2951     break;
2952
2953
2954     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2955
2956       The -x flag tells the sendmail command that mail from a local
2957       mail program has National Language Support (NLS) extended characters
2958       in the body of the mail item. The sendmail command can send mail with
2959       extended NLS characters across networks that normally corrupts these
2960       8-bit characters.
2961
2962     As Exim is 8-bit clean, it just ignores this flag. */
2963
2964     case 'x':
2965     if (*argrest != 0) badarg = TRUE;
2966     break;
2967
2968     /* All other initial characters are errors */
2969
2970     default:
2971     badarg = TRUE;
2972     break;
2973     }         /* End of high-level switch statement */
2974
2975   /* Failed to recognize the option, or syntax error */
2976
2977   if (badarg)
2978     {
2979     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2980       "option %s\n", arg);
2981     exit(EXIT_FAILURE);
2982     }
2983   }
2984
2985
2986 /* If -R or -S have been specified without -q, assume a single queue run. */
2987
2988 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2989   queue_interval < 0) queue_interval = 0;
2990
2991
2992 END_ARG:
2993 /* If usage_wanted is set we call the usage function - which never returns */
2994 if (usage_wanted) exim_usage(called_as);
2995
2996 /* Arguments have been processed. Check for incompatibilities. */
2997 if ((
2998     (smtp_input || extract_recipients || recipients_arg < argc) &&
2999     (daemon_listen || queue_interval >= 0 || bi_option ||
3000       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3001       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3002     ) ||
3003     (
3004     msg_action_arg > 0 &&
3005     (daemon_listen || queue_interval >= 0 || list_options ||
3006       (checking && msg_action != MSG_LOAD) ||
3007       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3008     ) ||
3009     (
3010     (daemon_listen || queue_interval >= 0) &&
3011     (sender_address != NULL || list_options || list_queue || checking ||
3012       bi_option)
3013     ) ||
3014     (
3015     daemon_listen && queue_interval == 0
3016     ) ||
3017     (
3018     list_options &&
3019     (checking || smtp_input || extract_recipients ||
3020       filter_test != FTEST_NONE || bi_option)
3021     ) ||
3022     (
3023     verify_address_mode &&
3024     (address_test_mode || smtp_input || extract_recipients ||
3025       filter_test != FTEST_NONE || bi_option)
3026     ) ||
3027     (
3028     address_test_mode && (smtp_input || extract_recipients ||
3029       filter_test != FTEST_NONE || bi_option)
3030     ) ||
3031     (
3032     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3033       extract_recipients)
3034     ) ||
3035     (
3036     deliver_selectstring != NULL && queue_interval < 0
3037     ) ||
3038     (
3039     msg_action == MSG_LOAD &&
3040       (!expansion_test || expansion_test_message != NULL)
3041     )
3042    )
3043   {
3044   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3045   exit(EXIT_FAILURE);
3046   }
3047
3048 /* If debugging is set up, set the file and the file descriptor to pass on to
3049 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3050 to run in the foreground. */
3051
3052 if (debug_selector != 0)
3053   {
3054   debug_file = stderr;
3055   debug_fd = fileno(debug_file);
3056   background_daemon = FALSE;
3057   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
3058   if (debug_selector != D_v)    /* -v only doesn't show this */
3059     {
3060     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3061       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3062       debug_selector);
3063     show_whats_supported(stderr);
3064     }
3065   }
3066
3067 /* When started with root privilege, ensure that the limits on the number of
3068 open files and the number of processes (where that is accessible) are
3069 sufficiently large, or are unset, in case Exim has been called from an
3070 environment where the limits are screwed down. Not all OS have the ability to
3071 change some of these limits. */
3072
3073 if (unprivileged)
3074   {
3075   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3076   }
3077 else
3078   {
3079   struct rlimit rlp;
3080
3081   #ifdef RLIMIT_NOFILE
3082   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3083     {
3084     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3085       strerror(errno));
3086     rlp.rlim_cur = rlp.rlim_max = 0;
3087     }
3088
3089   /* I originally chose 1000 as a nice big number that was unlikely to
3090   be exceeded. It turns out that some older OS have a fixed upper limit of
3091   256. */
3092
3093   if (rlp.rlim_cur < 1000)
3094     {
3095     rlp.rlim_cur = rlp.rlim_max = 1000;
3096     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3097       {
3098       rlp.rlim_cur = rlp.rlim_max = 256;
3099       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3100         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3101           strerror(errno));
3102       }
3103     }
3104   #endif
3105
3106   #ifdef RLIMIT_NPROC
3107   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3108     {
3109     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3110       strerror(errno));
3111     rlp.rlim_cur = rlp.rlim_max = 0;
3112     }
3113
3114   #ifdef RLIM_INFINITY
3115   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3116     {
3117     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3118   #else
3119   if (rlp.rlim_cur < 1000)
3120     {
3121     rlp.rlim_cur = rlp.rlim_max = 1000;
3122   #endif
3123     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3124       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3125         strerror(errno));
3126     }
3127   #endif
3128   }
3129
3130 /* Exim is normally entered as root (but some special configurations are
3131 possible that don't do this). However, it always spins off sub-processes that
3132 set their uid and gid as required for local delivery. We don't want to pass on
3133 any extra groups that root may belong to, so we want to get rid of them all at
3134 this point.
3135
3136 We need to obey setgroups() at this stage, before possibly giving up root
3137 privilege for a changed configuration file, but later on we might need to
3138 check on the additional groups for the admin user privilege - can't do that
3139 till after reading the config, which might specify the exim gid. Therefore,
3140 save the group list here first. */
3141
3142 group_count = getgroups(NGROUPS_MAX, group_list);
3143
3144 /* There is a fundamental difference in some BSD systems in the matter of
3145 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3146 known not to be different. On the "different" systems there is a single group
3147 list, and the first entry in it is the current group. On all other versions of
3148 Unix there is a supplementary group list, which is in *addition* to the current
3149 group. Consequently, to get rid of all extraneous groups on a "standard" system
3150 you pass over 0 groups to setgroups(), while on a "different" system you pass
3151 over a single group - the current group, which is always the first group in the
3152 list. Calling setgroups() with zero groups on a "different" system results in
3153 an error return. The following code should cope with both types of system.
3154
3155 However, if this process isn't running as root, setgroups() can't be used
3156 since you have to be root to run it, even if throwing away groups. Not being
3157 root here happens only in some unusual configurations. We just ignore the
3158 error. */
3159
3160 if (setgroups(0, NULL) != 0)
3161   {
3162   if (setgroups(1, group_list) != 0 && !unprivileged)
3163     {
3164     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3165     exit(EXIT_FAILURE);
3166     }
3167   }
3168
3169 /* If the configuration file name has been altered by an argument on the
3170 command line (either a new file name or a macro definition) and the caller is
3171 not root or the exim user, or if this is a filter testing run, remove any
3172 setuid privilege the program has, and run as the underlying user.
3173
3174 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3175 severely restricts the use of -C for some purposes.
3176
3177 Otherwise, set the real ids to the effective values (should be root unless run
3178 from inetd, which it can either be root or the exim uid, if one is configured).
3179
3180 There is a private mechanism for bypassing some of this, in order to make it
3181 possible to test lots of configurations automatically, without having either to
3182 recompile each time, or to patch in an actual configuration file name and other
3183 values (such as the path name). If running in the test harness, pretend that
3184 configuration file changes and macro definitions haven't happened. */
3185
3186 if ((                                            /* EITHER */
3187     (config_changed || macros != NULL) &&        /* Config changed, and */
3188     real_uid != root_uid &&                      /* Not root, and */
3189     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3190     real_uid != exim_uid &&                      /* Not exim, and */
3191     #endif
3192     !running_in_test_harness                     /* Not fudged */
3193     ) ||                                         /*   OR   */
3194     expansion_test                               /* expansion testing */
3195     ||                                           /*   OR   */
3196     filter_test != FTEST_NONE)                   /* Filter testing */
3197   {
3198   setgroups(group_count, group_list);
3199   exim_setugid(real_uid, real_gid, FALSE,
3200     US"-C, -D, -be or -bf forces real uid");
3201   removed_privilege = TRUE;
3202
3203   /* In the normal case when Exim is called like this, stderr is available
3204   and should be used for any logging information because attempts to write
3205   to the log will usually fail. To arrange this, we unset really_exim. However,
3206   if no stderr is available there is no point - we might as well have a go
3207   at the log (if it fails, syslog will be written). */
3208
3209   if (log_stderr != NULL) really_exim = FALSE;
3210   }
3211
3212 /* Privilege is to be retained for the moment. It may be dropped later,
3213 depending on the job that this Exim process has been asked to do. For now, set
3214 the real uid to the effective so that subsequent re-execs of Exim are done by a
3215 privileged user. */
3216
3217 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3218
3219 /* If testing a filter, open the file(s) now, before wasting time doing other
3220 setups and reading the message. */
3221
3222 if ((filter_test & FTEST_SYSTEM) != 0)
3223   {
3224   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3225   if (filter_sfd < 0)
3226     {
3227     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3228       strerror(errno));
3229     return EXIT_FAILURE;
3230     }
3231   }
3232
3233 if ((filter_test & FTEST_USER) != 0)
3234   {
3235   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3236   if (filter_ufd < 0)
3237     {
3238     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3239       strerror(errno));
3240     return EXIT_FAILURE;
3241     }
3242   }
3243
3244 /* Read the main runtime configuration data; this gives up if there
3245 is a failure. It leaves the configuration file open so that the subsequent
3246 configuration data for delivery can be read if needed. */
3247
3248 readconf_main();
3249
3250 /* Handle the decoding of logging options. */
3251
3252 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3253   log_options, log_options_count, US"log");
3254
3255 DEBUG(D_any)
3256   {
3257   debug_printf("configuration file is %s\n", config_main_filename);
3258   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3259     log_extra_selector);
3260   }
3261
3262 /* If domain literals are not allowed, check the sender address that was
3263 supplied with -f. Ditto for a stripped trailing dot. */
3264
3265 if (sender_address != NULL)
3266   {
3267   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3268     {
3269     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3270       "allowed\n", sender_address);
3271     return EXIT_FAILURE;
3272     }
3273   if (f_end_dot && !strip_trailing_dot)
3274     {
3275     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3276       "(trailing dot not allowed)\n", sender_address);
3277     return EXIT_FAILURE;
3278     }
3279   }
3280
3281 /* Paranoia check of maximum lengths of certain strings. There is a check
3282 on the length of the log file path in log.c, which will come into effect
3283 if there are any calls to write the log earlier than this. However, if we
3284 get this far but the string is very long, it is better to stop now than to
3285 carry on and (e.g.) receive a message and then have to collapse. The call to
3286 log_write() from here will cause the ultimate panic collapse if the complete
3287 file name exceeds the buffer length. */
3288
3289 if (Ustrlen(log_file_path) > 200)
3290   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3291     "log_file_path is longer than 200 chars: aborting");
3292
3293 if (Ustrlen(pid_file_path) > 200)
3294   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3295     "pid_file_path is longer than 200 chars: aborting");
3296
3297 if (Ustrlen(spool_directory) > 200)
3298   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3299     "spool_directory is longer than 200 chars: aborting");
3300
3301 /* Length check on the process name given to syslog for its TAG field,
3302 which is only permitted to be 32 characters or less. See RFC 3164. */
3303
3304 if (Ustrlen(syslog_processname) > 32)
3305   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3306     "syslog_processname is longer than 32 chars: aborting");
3307
3308 /* In some operating systems, the environment variable TMPDIR controls where
3309 temporary files are created; Exim doesn't use these (apart from when delivering
3310 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3311 If TMPDIR is found in the environment, reset it to the value defined in the
3312 TMPDIR macro, if this macro is defined. */
3313
3314 #ifdef TMPDIR
3315   {
3316   uschar **p;
3317   for (p = USS environ; *p != NULL; p++)
3318     {
3319     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3320         Ustrcmp(*p+7, TMPDIR) != 0)
3321       {
3322       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3323       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3324       *p = newp;
3325       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3326       }
3327     }
3328   }
3329 #endif
3330
3331 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3332 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3333 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3334 called by a user who has set the TZ variable. This then affects the timestamps
3335 in log files and in Received: headers, and any created Date: header lines. The
3336 required timezone is settable in the configuration file, so nothing can be done
3337 about this earlier - but hopefully nothing will normally be logged earlier than
3338 this. We have to make a new environment if TZ is wrong, but don't bother if
3339 timestamps_utc is set, because then all times are in UTC anyway. */
3340
3341 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3342   {
3343   timestamps_utc = TRUE;
3344   }
3345 else
3346   {
3347   uschar *envtz = US getenv("TZ");
3348   if ((envtz == NULL && timezone_string != NULL) ||
3349       (envtz != NULL &&
3350         (timezone_string == NULL ||
3351          Ustrcmp(timezone_string, envtz) != 0)))
3352     {
3353     uschar **p = USS environ;
3354     uschar **new;
3355     uschar **newp;
3356     int count = 0;
3357     while (*p++ != NULL) count++;
3358     if (envtz == NULL) count++;
3359     newp = new = malloc(sizeof(uschar *) * (count + 1));
3360     for (p = USS environ; *p != NULL; p++)
3361       {
3362       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3363       *newp++ = *p;
3364       }
3365     if (timezone_string != NULL)
3366       {
3367       *newp = malloc(Ustrlen(timezone_string) + 4);
3368       sprintf(CS *newp++, "TZ=%s", timezone_string);
3369       }
3370     *newp = NULL;
3371     environ = CSS new;
3372     tzset();
3373     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3374       tod_stamp(tod_log));
3375     }
3376   }
3377
3378 /* Handle the case when we have removed the setuid privilege because of -C or
3379 -D. This means that the caller of Exim was not root, and, provided that
3380 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3381 the binary.
3382
3383 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3384 were running as the exim user defined in the configuration file (different to
3385 the one in the binary). The sysadmin may expect this case to retain privilege
3386 because "the binary was called by the Exim user", but it hasn't, because of the
3387 order in which it handles this stuff. There are two possibilities:
3388
3389   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3390       to do message deliveries. Thus, the fact that it is running as a
3391       non-privileged user is plausible, and might be wanted in some special
3392       configurations. However, really_exim will have been set false when
3393       privilege was dropped, to stop Exim trying to write to its normal log
3394       files. Therefore, re-enable normal log processing, assuming the sysadmin
3395       has set up the log directory correctly.
3396
3397   (2) If deliver_drop_privilege is not set, the configuration won't work as
3398       apparently intended, and so we log a panic message. In order to retain
3399       root for -C or -D, the caller must either be root or the Exim user
3400       defined in the binary (when deliver_drop_ privilege is false).
3401
3402 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3403 built-in exim user or one defined in the configuration. In either event,
3404 re-enable log processing, assuming the sysadmin knows what they are doing. */
3405
3406 if (removed_privilege && (config_changed || macros != NULL) &&
3407     real_uid == exim_uid)
3408   {
3409   #ifdef ALT_CONFIG_ROOT_ONLY
3410   really_exim = TRUE;   /* let logging work normally */
3411   #else
3412
3413   if (deliver_drop_privilege)
3414     really_exim = TRUE; /* let logging work normally */
3415   else
3416     log_write(0, LOG_MAIN|LOG_PANIC,
3417       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3418       (int)exim_uid, config_changed? "-C" : "-D");
3419   #endif
3420   }
3421
3422 /* Start up Perl interpreter if Perl support is configured and there is a
3423 perl_startup option, and the configuration or the command line specifies
3424 initializing starting. Note that the global variables are actually called
3425 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3426
3427 #ifdef EXIM_PERL
3428 if (perl_start_option != 0)
3429   opt_perl_at_start = (perl_start_option > 0);
3430 if (opt_perl_at_start && opt_perl_startup != NULL)
3431   {
3432   uschar *errstr;
3433   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3434   errstr = init_perl(opt_perl_startup);
3435   if (errstr != NULL)
3436     {
3437     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3438     return EXIT_FAILURE;
3439     }
3440   opt_perl_started = TRUE;
3441   }
3442 #endif /* EXIM_PERL */
3443
3444 /* Log the arguments of the call if the configuration file said so. This is
3445 a debugging feature for finding out what arguments certain MUAs actually use.
3446 Don't attempt it if logging is disabled, or if listing variables or if
3447 verifying/testing addresses or expansions. */
3448
3449 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3450       && really_exim && !list_options && !checking)
3451   {
3452   int i;
3453   uschar *p = big_buffer;
3454   Ustrcpy(p, "cwd=");
3455   (void)getcwd(CS p+4, big_buffer_size - 4);
3456   while (*p) p++;
3457   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3458   while (*p) p++;
3459   for (i = 0; i < argc; i++)
3460     {
3461     int len = Ustrlen(argv[i]);
3462     uschar *printing;
3463     uschar *quote;
3464     if (p + len + 8 >= big_buffer + big_buffer_size)
3465       {
3466       Ustrcpy(p, " ...");
3467       log_write(0, LOG_MAIN, "%s", big_buffer);
3468       Ustrcpy(big_buffer, "...");
3469       p = big_buffer + 3;
3470       }
3471     printing = string_printing(argv[i]);
3472     if (printing[0] == 0) quote = US"\""; else
3473       {
3474       uschar *pp = printing;
3475       quote = US"";
3476       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3477       }
3478     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3479       (p - big_buffer) - 4), printing, quote);
3480     while (*p) p++;
3481     }
3482
3483   if ((log_extra_selector & LX_arguments) != 0)
3484     log_write(0, LOG_MAIN, "%s", big_buffer);
3485   else
3486     debug_printf("%s\n", big_buffer);
3487   }
3488
3489 /* Set the working directory to be the top-level spool directory. We don't rely
3490 on this in the code, which always uses fully qualified names, but it's useful
3491 for core dumps etc. Don't complain if it fails - the spool directory might not
3492 be generally accessible and calls with the -C option (and others) have lost
3493 privilege by now. Before the chdir, we try to ensure that the directory exists.
3494 */
3495
3496 if (Uchdir(spool_directory) != 0)
3497   {
3498   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3499   (void)Uchdir(spool_directory);
3500   }
3501
3502 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3503 alias file. Exim doesn't have such a concept, but this call is screwed into
3504 Sun's YP makefiles. Handle this by calling a configured script, as the real
3505 user who called Exim. The -oA option can be used to pass an argument to the
3506 script. */
3507
3508 if (bi_option)
3509   {
3510   (void)fclose(config_file);
3511   if (bi_command != NULL)
3512     {
3513     int i = 0;
3514     uschar *argv[3];
3515     argv[i++] = bi_command;
3516     if (alias_arg != NULL) argv[i++] = alias_arg;
3517     argv[i++] = NULL;
3518
3519     setgroups(group_count, group_list);
3520     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3521
3522     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3523       (argv[1] == NULL)? US"" : argv[1]);
3524
3525     execv(CS argv[0], (char *const *)argv);
3526     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3527     exit(EXIT_FAILURE);
3528     }
3529   else
3530     {
3531     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3532     exit(EXIT_SUCCESS);
3533     }
3534   }
3535
3536 /* If an action on specific messages is requested, or if a daemon or queue
3537 runner is being started, we need to know if Exim was called by an admin user.
3538 This is the case if the real user is root or exim, or if the real group is
3539 exim, or if one of the supplementary groups is exim or a group listed in
3540 admin_groups. We don't fail all message actions immediately if not admin_user,
3541 since some actions can be performed by non-admin users. Instead, set admin_user
3542 for later interrogation. */
3543
3544 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3545   admin_user = TRUE;
3546 else
3547   {
3548   int i, j;
3549   for (i = 0; i < group_count; i++)
3550     {
3551     if (group_list[i] == exim_gid) admin_user = TRUE;
3552     else if (admin_groups != NULL)
3553       {
3554       for (j = 1; j <= (int)(admin_groups[0]); j++)
3555         if (admin_groups[j] == group_list[i])
3556           { admin_user = TRUE; break; }
3557       }
3558     if (admin_user) break;
3559     }
3560   }
3561
3562 /* Another group of privileged users are the trusted users. These are root,
3563 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3564 are permitted to specify sender_addresses with -f on the command line, and
3565 other message parameters as well. */
3566
3567 if (real_uid == root_uid || real_uid == exim_uid)
3568   trusted_caller = TRUE;
3569 else
3570   {
3571   int i, j;
3572
3573   if (trusted_users != NULL)
3574     {
3575     for (i = 1; i <= (int)(trusted_users[0]); i++)
3576       if (trusted_users[i] == real_uid)
3577         { trusted_caller = TRUE; break; }
3578     }
3579
3580   if (!trusted_caller && trusted_groups != NULL)
3581     {
3582     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3583       {
3584       if (trusted_groups[i] == real_gid)
3585         trusted_caller = TRUE;
3586       else for (j = 0; j < group_count; j++)
3587         {
3588         if (trusted_groups[i] == group_list[j])
3589           { trusted_caller = TRUE; break; }
3590         }
3591       if (trusted_caller) break;
3592       }
3593     }
3594   }
3595
3596 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3597 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3598
3599 /* Only an admin user may start the daemon or force a queue run in the default
3600 configuration, but the queue run restriction can be relaxed. Only an admin
3601 user may request that a message be returned to its sender forthwith. Only an
3602 admin user may specify a debug level greater than D_v (because it might show
3603 passwords, etc. in lookup queries). Only an admin user may request a queue
3604 count. Only an admin user can use the test interface to scan for email
3605 (because Exim will be in the spool dir and able to look at mails). */
3606
3607 if (!admin_user)
3608   {
3609   BOOL debugset = (debug_selector & ~D_v) != 0;
3610   if (deliver_give_up || daemon_listen || malware_test_file ||
3611      (count_queue && queue_list_requires_admin) ||
3612      (list_queue && queue_list_requires_admin) ||
3613      (queue_interval >= 0 && prod_requires_admin) ||
3614      (debugset && !running_in_test_harness))
3615     {
3616     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3617     exit(EXIT_FAILURE);
3618     }
3619   }
3620
3621 /* If the real user is not root or the exim uid, the argument for passing
3622 in an open TCP/IP connection for another message is not permitted, nor is
3623 running with the -N option for any delivery action, unless this call to exim is
3624 one that supplied an input message, or we are using a patched exim for
3625 regression testing. */
3626
3627 if (real_uid != root_uid && real_uid != exim_uid &&
3628      (continue_hostname != NULL ||
3629        (dont_deliver &&
3630          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3631        )) && !running_in_test_harness)
3632   {
3633   fprintf(stderr, "exim: Permission denied\n");
3634   return EXIT_FAILURE;
3635   }
3636
3637 /* If the caller is not trusted, certain arguments are ignored when running for
3638 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3639 Note that authority for performing certain actions on messages is tested in the
3640 queue_action() function. */
3641
3642 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3643   {
3644   sender_host_name = sender_host_address = interface_address =
3645     sender_ident = received_protocol = NULL;
3646   sender_host_port = interface_port = 0;
3647   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3648   }
3649
3650 /* If a sender host address is set, extract the optional port number off the
3651 end of it and check its syntax. Do the same thing for the interface address.
3652 Exim exits if the syntax is bad. */
3653
3654 else
3655   {
3656   if (sender_host_address != NULL)
3657     sender_host_port = check_port(sender_host_address);
3658   if (interface_address != NULL)
3659     interface_port = check_port(interface_address);
3660   }
3661
3662 /* If an SMTP message is being received check to see if the standard input is a
3663 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3664 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3665 barf. */
3666
3667 if (smtp_input)
3668   {
3669   union sockaddr_46 inetd_sock;
3670   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3671   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3672     {
3673     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3674     if (family == AF_INET || family == AF_INET6)
3675       {
3676       union sockaddr_46 interface_sock;
3677       size = sizeof(interface_sock);
3678
3679       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3680         interface_address = host_ntoa(-1, &interface_sock, NULL,
3681           &interface_port);
3682
3683       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3684
3685       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3686         {
3687         is_inetd = TRUE;
3688         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3689           NULL, &sender_host_port);
3690         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3691           "inetd is not supported when mua_wrapper is set");
3692         }
3693       else
3694         {
3695         fprintf(stderr,
3696           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3697         return EXIT_FAILURE;
3698         }
3699       }
3700     }
3701   }
3702
3703 /* If the load average is going to be needed while receiving a message, get it
3704 now for those OS that require the first call to os_getloadavg() to be done as
3705 root. There will be further calls later for each message received. */
3706
3707 #ifdef LOAD_AVG_NEEDS_ROOT
3708 if (receiving_message &&
3709       (queue_only_load >= 0 ||
3710         (is_inetd && smtp_load_reserve >= 0)
3711       ))
3712   {
3713   load_average = OS_GETLOADAVG();
3714   }
3715 #endif
3716
3717 /* The queue_only configuration option can be overridden by -odx on the command
3718 line, except that if queue_only_override is false, queue_only cannot be unset
3719 from the command line. */
3720
3721 if (queue_only_set && (queue_only_override || arg_queue_only))
3722   queue_only = arg_queue_only;
3723
3724 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3725 -or and -os. */
3726
3727 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3728 if (arg_smtp_receive_timeout >= 0)
3729   smtp_receive_timeout = arg_smtp_receive_timeout;
3730
3731 /* If Exim was started with root privilege, unless we have already removed the
3732 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3733 except when starting the daemon or doing some kind of delivery or address
3734 testing (-bt). These are the only cases when root need to be retained. We run
3735 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3736 retained only for starting the daemon. We always do the initgroups() in this
3737 situation (controlled by the TRUE below), in order to be as close as possible
3738 to the state Exim usually runs in. */
3739
3740 if (!unprivileged &&                      /* originally had root AND */
3741     !removed_privilege &&                 /* still got root AND      */
3742     !daemon_listen &&                     /* not starting the daemon */
3743     queue_interval <= 0 &&                /* (either kind of daemon) */
3744       (                                   /*    AND EITHER           */
3745       deliver_drop_privilege ||           /* requested unprivileged  */
3746         (                                 /*       OR                */
3747         queue_interval < 0 &&             /* not running the queue   */
3748         (msg_action_arg < 0 ||            /*       and               */
3749           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3750         (!checking || !address_test_mode) /* not address checking    */
3751         )
3752       ))
3753   {
3754   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3755   }
3756
3757 /* When we are retaining a privileged uid, we still change to the exim gid. */
3758
3759 else setgid(exim_gid);
3760
3761 /* Handle a request to scan a file for malware */
3762 if (malware_test_file)
3763   {
3764   int result;
3765   set_process_info("scanning file for malware");
3766   result = malware_in_file(malware_test_file);
3767   if (result == FAIL)
3768     {
3769     printf("No malware found.\n");
3770     exit(EXIT_SUCCESS);
3771     }
3772   if (result != OK)
3773     {
3774     printf("Malware lookup returned non-okay/fail: %d\n", result);
3775     exit(EXIT_FAILURE);
3776     }
3777   if (malware_name)
3778     printf("Malware found: %s\n", malware_name);
3779   else
3780     printf("Malware scan detected malware of unknown name.\n");
3781   exit(EXIT_FAILURE);
3782   }
3783
3784 /* Handle a request to list the delivery queue */
3785
3786 if (list_queue)
3787   {
3788   set_process_info("listing the queue");
3789   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3790   exit(EXIT_SUCCESS);
3791   }
3792
3793 /* Handle a request to count the delivery queue */
3794
3795 if (count_queue)
3796   {
3797   set_process_info("counting the queue");
3798   queue_count();
3799   exit(EXIT_SUCCESS);
3800   }
3801
3802 /* Handle actions on specific messages, except for the force delivery and
3803 message load actions, which are done below. Some actions take a whole list of
3804 message ids, which are known to continue up to the end of the arguments. Others
3805 take a single message id and then operate on the recipients list. */
3806
3807 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3808   {
3809   int yield = EXIT_SUCCESS;
3810   set_process_info("acting on specified messages");
3811
3812   if (!one_msg_action)
3813     {
3814     for (i = msg_action_arg; i < argc; i++)
3815       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3816         yield = EXIT_FAILURE;
3817     }
3818
3819   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3820     recipients_arg)) yield = EXIT_FAILURE;
3821   exit(yield);
3822   }
3823
3824 /* All the modes below here require the remaining configuration sections
3825 to be read, except that we can skip over the ACL setting when delivering
3826 specific messages, or doing a queue run. (For various testing cases we could
3827 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3828 for skipping. */
3829
3830 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3831
3832 /* The configuration data will have been read into POOL_PERM because we won't
3833 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3834 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3835 configuration were read into POOL_MAIN, because we don't do any resets till
3836 later on. However, it seems right, and it does ensure that both pools get used.
3837 */
3838
3839 store_pool = POOL_MAIN;
3840
3841 /* Handle the -brt option. This is for checking out retry configurations.
3842 The next three arguments are a domain name or a complete address, and
3843 optionally two error numbers. All it does is to call the function that
3844 scans the retry configuration data. */
3845
3846 if (test_retry_arg >= 0)
3847   {
3848   retry_config *yield;
3849   int basic_errno = 0;
3850   int more_errno = 0;
3851   uschar *s1, *s2;
3852
3853   if (test_retry_arg >= argc)
3854     {
3855     printf("-brt needs a domain or address argument\n");
3856     exim_exit(EXIT_FAILURE);
3857     }
3858   s1 = argv[test_retry_arg++];
3859   s2 = NULL;
3860
3861   /* If the first argument contains no @ and no . it might be a local user
3862   or it might be a single-component name. Treat as a domain. */
3863
3864   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3865     {
3866     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3867       "being \ntreated as a one-component domain, not as a local part.\n\n",
3868       s1);
3869     }
3870
3871   /* There may be an optional second domain arg. */
3872
3873   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3874     s2 = argv[test_retry_arg++];
3875
3876   /* The final arg is an error name */
3877
3878   if (test_retry_arg < argc)
3879     {
3880     uschar *ss = argv[test_retry_arg];
3881     uschar *error =
3882       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3883     if (error != NULL)
3884       {
3885       printf("%s\n", CS error);
3886       return EXIT_FAILURE;
3887       }
3888
3889     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3890     code > 100 as an error is for matching codes to the decade. Turn them into
3891     a real error code, off the decade. */
3892
3893     if (basic_errno == ERRNO_MAIL4XX ||
3894         basic_errno == ERRNO_RCPT4XX ||
3895         basic_errno == ERRNO_DATA4XX)
3896       {
3897       int code = (more_errno >> 8) & 255;
3898       if (code == 255)
3899         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3900       else if (code > 100)
3901         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3902       }
3903     }
3904
3905   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3906   if (yield == NULL) printf("No retry information found\n"); else
3907     {
3908     retry_rule *r;
3909     more_errno = yield->more_errno;
3910     printf("Retry rule: %s  ", yield->pattern);
3911
3912     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3913       {
3914       printf("quota%s%s  ",
3915         (more_errno > 0)? "_" : "",
3916         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3917       }
3918     else if (yield->basic_errno == ECONNREFUSED)
3919       {
3920       printf("refused%s%s  ",
3921         (more_errno > 0)? "_" : "",
3922         (more_errno == 'M')? "MX" :
3923         (more_errno == 'A')? "A" : "");
3924       }
3925     else if (yield->basic_errno == ETIMEDOUT)
3926       {
3927       printf("timeout");
3928       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3929       more_errno &= 255;
3930       if (more_errno != 0) printf("_%s",
3931         (more_errno == 'M')? "MX" : "A");
3932       printf("  ");
3933       }
3934     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3935       printf("auth_failed  ");
3936     else printf("*  ");
3937
3938     for (r = yield->rules; r != NULL; r = r->next)
3939       {
3940       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3941       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3942       if (r->rule == 'G')
3943         {
3944         int x = r->p2;
3945         int f = x % 1000;
3946         int d = 100;
3947         printf(",%d.", x/1000);
3948         do
3949           {
3950           printf("%d", f/d);
3951           f %= d;
3952           d /= 10;
3953           }
3954         while (f != 0);
3955         }
3956       printf("; ");
3957       }
3958
3959     printf("\n");
3960     }
3961   exim_exit(EXIT_SUCCESS);
3962   }
3963
3964 /* Handle a request to list one or more configuration options */
3965
3966 if (list_options)
3967   {
3968   set_process_info("listing variables");
3969   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3970     else for (i = recipients_arg; i < argc; i++)
3971       {
3972       if (i < argc - 1 &&
3973           (Ustrcmp(argv[i], "router") == 0 ||
3974            Ustrcmp(argv[i], "transport") == 0 ||
3975            Ustrcmp(argv[i], "authenticator") == 0 ||
3976            Ustrcmp(argv[i], "macro") == 0))
3977         {
3978         readconf_print(argv[i+1], argv[i]);
3979         i++;
3980         }
3981       else readconf_print(argv[i], NULL);
3982       }
3983   exim_exit(EXIT_SUCCESS);
3984   }
3985
3986
3987 /* Handle a request to deliver one or more messages that are already on the
3988 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3989 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3990
3991 Delivery of specific messages is typically used for a small number when
3992 prodding by hand (when the option forced_delivery will be set) or when
3993 re-execing to regain root privilege. Each message delivery must happen in a
3994 separate process, so we fork a process for each one, and run them sequentially
3995 so that debugging output doesn't get intertwined, and to avoid spawning too
3996 many processes if a long list is given. However, don't fork for the last one;
3997 this saves a process in the common case when Exim is called to deliver just one
3998 message. */
3999
4000 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4001   {
4002   if (prod_requires_admin && !admin_user)
4003     {
4004     fprintf(stderr, "exim: Permission denied\n");
4005     exim_exit(EXIT_FAILURE);
4006     }
4007   set_process_info("delivering specified messages");
4008   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4009   for (i = msg_action_arg; i < argc; i++)
4010     {
4011     int status;
4012     pid_t pid;
4013     if (i == argc - 1)
4014       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4015     else if ((pid = fork()) == 0)
4016       {
4017       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4018       _exit(EXIT_SUCCESS);
4019       }
4020     else if (pid < 0)
4021       {
4022       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4023         strerror(errno));
4024       exim_exit(EXIT_FAILURE);
4025       }
4026     else wait(&status);
4027     }
4028   exim_exit(EXIT_SUCCESS);
4029   }
4030
4031
4032 /* If only a single queue run is requested, without SMTP listening, we can just
4033 turn into a queue runner, with an optional starting message id. */
4034
4035 if (queue_interval == 0 && !daemon_listen)
4036   {
4037   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4038     (start_queue_run_id == NULL)? US"" : US" starting at ",
4039     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4040     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
4041     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
4042   set_process_info("running the queue (single queue run)");
4043   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4044   exim_exit(EXIT_SUCCESS);
4045   }
4046
4047
4048 /* Find the login name of the real user running this process. This is always
4049 needed when receiving a message, because it is written into the spool file. It
4050 may also be used to construct a from: or a sender: header, and in this case we
4051 need the user's full name as well, so save a copy of it, checked for RFC822
4052 syntax and munged if necessary, if it hasn't previously been set by the -F
4053 argument. We may try to get the passwd entry more than once, in case NIS or
4054 other delays are in evidence. Save the home directory for use in filter testing
4055 (only). */
4056
4057 for (i = 0;;)
4058   {
4059   if ((pw = getpwuid(real_uid)) != NULL)
4060     {
4061     originator_login = string_copy(US pw->pw_name);
4062     originator_home = string_copy(US pw->pw_dir);
4063
4064     /* If user name has not been set by -F, set it from the passwd entry
4065     unless -f has been used to set the sender address by a trusted user. */
4066
4067     if (originator_name == NULL)
4068       {
4069       if (sender_address == NULL ||
4070            (!trusted_caller && filter_test == FTEST_NONE))
4071         {
4072         uschar *name = US pw->pw_gecos;
4073         uschar *amp = Ustrchr(name, '&');
4074         uschar buffer[256];
4075
4076         /* Most Unix specify that a '&' character in the gecos field is
4077         replaced by a copy of the login name, and some even specify that
4078         the first character should be upper cased, so that's what we do. */
4079
4080         if (amp != NULL)
4081           {
4082           int loffset;
4083           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4084             amp - name, name, &loffset, originator_login, amp + 1);
4085           buffer[loffset] = toupper(buffer[loffset]);
4086           name = buffer;
4087           }
4088
4089         /* If a pattern for matching the gecos field was supplied, apply
4090         it and then expand the name string. */
4091
4092         if (gecos_pattern != NULL && gecos_name != NULL)
4093           {
4094           const pcre *re;
4095           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4096
4097           if (regex_match_and_setup(re, name, 0, -1))
4098             {
4099             uschar *new_name = expand_string(gecos_name);
4100             expand_nmax = -1;
4101             if (new_name != NULL)
4102               {
4103               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4104                 "gecos field \"%s\"\n", new_name, name);
4105               name = new_name;
4106               }
4107             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4108               "\"%s\": %s\n", gecos_name, expand_string_message);
4109             }
4110           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4111             "gecos field \"%s\"\n", gecos_pattern, name);
4112           store_free((void *)re);
4113           }
4114         originator_name = string_copy(name);
4115         }
4116
4117       /* A trusted caller has used -f but not -F */
4118
4119       else originator_name = US"";
4120       }
4121
4122     /* Break the retry loop */
4123
4124     break;
4125     }
4126
4127   if (++i > finduser_retries) break;
4128   sleep(1);
4129   }
4130
4131 /* If we cannot get a user login, log the incident and give up, unless the
4132 configuration specifies something to use. When running in the test harness,
4133 any setting of unknown_login overrides the actual name. */
4134
4135 if (originator_login == NULL || running_in_test_harness)
4136   {
4137   if (unknown_login != NULL)
4138     {
4139     originator_login = expand_string(unknown_login);
4140     if (originator_name == NULL && unknown_username != NULL)
4141       originator_name = expand_string(unknown_username);
4142     if (originator_name == NULL) originator_name = US"";
4143     }
4144   if (originator_login == NULL)
4145     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4146       (int)real_uid);
4147   }
4148
4149 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4150 RFC822 address.*/
4151
4152 originator_name = string_copy(parse_fix_phrase(originator_name,
4153   Ustrlen(originator_name), big_buffer, big_buffer_size));
4154
4155 /* If a message is created by this call of Exim, the uid/gid of its originator
4156 are those of the caller. These values are overridden if an existing message is
4157 read in from the spool. */
4158
4159 originator_uid = real_uid;
4160 originator_gid = real_gid;
4161
4162 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4163   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4164
4165 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4166 returns. We leave this till here so that the originator_ fields are available
4167 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4168 mode. */
4169
4170 if (daemon_listen || queue_interval > 0)
4171   {
4172   if (mua_wrapper)
4173     {
4174     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4175     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4176       "mua_wrapper is set");
4177     }
4178   daemon_go();
4179   }
4180
4181 /* If the sender ident has not been set (by a trusted caller) set it to
4182 the caller. This will get overwritten below for an inetd call. If a trusted
4183 caller has set it empty, unset it. */
4184
4185 if (sender_ident == NULL) sender_ident = originator_login;
4186   else if (sender_ident[0] == 0) sender_ident = NULL;
4187
4188 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4189 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4190 originator_* variables set. */
4191
4192 if (test_rewrite_arg >= 0)
4193   {
4194   really_exim = FALSE;
4195   if (test_rewrite_arg >= argc)
4196     {
4197     printf("-brw needs an address argument\n");
4198     exim_exit(EXIT_FAILURE);
4199     }
4200   rewrite_test(argv[test_rewrite_arg]);
4201   exim_exit(EXIT_SUCCESS);
4202   }
4203
4204 /* A locally-supplied message is considered to be coming from a local user
4205 unless a trusted caller supplies a sender address with -f, or is passing in the
4206 message via SMTP (inetd invocation or otherwise). */
4207
4208 if ((sender_address == NULL && !smtp_input) ||
4209     (!trusted_caller && filter_test == FTEST_NONE))
4210   {
4211   sender_local = TRUE;
4212
4213   /* A trusted caller can supply authenticated_sender and authenticated_id
4214   via -oMas and -oMai and if so, they will already be set. Otherwise, force
4215   defaults except when host checking. */
4216
4217   if (authenticated_sender == NULL && !host_checking)
4218     authenticated_sender = string_sprintf("%s@%s", originator_login,
4219       qualify_domain_sender);
4220   if (authenticated_id == NULL && !host_checking)
4221     authenticated_id = originator_login;
4222   }
4223
4224 /* Trusted callers are always permitted to specify the sender address.
4225 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4226 is specified is the empty address. However, if a trusted caller does not
4227 specify a sender address for SMTP input, we leave sender_address unset. This
4228 causes the MAIL commands to be honoured. */
4229
4230 if ((!smtp_input && sender_address == NULL) ||
4231     !receive_check_set_sender(sender_address))
4232   {
4233   /* Either the caller is not permitted to set a general sender, or this is
4234   non-SMTP input and the trusted caller has not set a sender. If there is no
4235   sender, or if a sender other than <> is set, override with the originator's
4236   login (which will get qualified below), except when checking things. */
4237
4238   if (sender_address == NULL             /* No sender_address set */
4239        ||                                /*         OR            */
4240        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4241        !checking &&                      /* Not running tests, AND */
4242        filter_test == FTEST_NONE))       /* Not testing a filter */
4243     {
4244     sender_address = originator_login;
4245     sender_address_forced = FALSE;
4246     sender_address_domain = 0;
4247     }
4248   }
4249
4250 /* Remember whether an untrusted caller set the sender address */
4251
4252 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4253
4254 /* Ensure that the sender address is fully qualified unless it is the empty
4255 address, which indicates an error message, or doesn't exist (root caller, smtp
4256 interface, no -f argument). */
4257
4258 if (sender_address != NULL && sender_address[0] != 0 &&
4259     sender_address_domain == 0)
4260   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4261     qualify_domain_sender);
4262
4263 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4264
4265 /* Handle a request to verify a list of addresses, or test them for delivery.
4266 This must follow the setting of the sender address, since routers can be
4267 predicated upon the sender. If no arguments are given, read addresses from
4268 stdin. Set debug_level to at least D_v to get full output for address testing.
4269 */
4270
4271 if (verify_address_mode || address_test_mode)
4272   {
4273   int exit_value = 0;
4274   int flags = vopt_qualify;
4275
4276   if (verify_address_mode)
4277     {
4278     if (!verify_as_sender) flags |= vopt_is_recipient;
4279     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4280     }
4281
4282   else
4283     {
4284     flags |= vopt_is_recipient;
4285     debug_selector |= D_v;
4286     debug_file = stderr;
4287     debug_fd = fileno(debug_file);
4288     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4289     }
4290
4291   if (recipients_arg < argc)
4292     {
4293     while (recipients_arg < argc)
4294       {
4295       uschar *s = argv[recipients_arg++];
4296       while (*s != 0)
4297         {
4298         BOOL finished = FALSE;
4299         uschar *ss = parse_find_address_end(s, FALSE);
4300         if (*ss == ',') *ss = 0; else finished = TRUE;
4301         test_address(s, flags, &exit_value);
4302         s = ss;
4303         if (!finished)
4304           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4305         }
4306       }
4307     }
4308
4309   else for (;;)
4310     {
4311     uschar *s = get_stdinput(NULL, NULL);
4312     if (s == NULL) break;
4313     test_address(s, flags, &exit_value);
4314     }
4315
4316   route_tidyup();
4317   exim_exit(exit_value);
4318   }
4319
4320 /* Handle expansion checking. Either expand items on the command line, or read
4321 from stdin if there aren't any. If -Mset was specified, load the message so
4322 that its variables can be used, but restrict this facility to admin users.
4323 Otherwise, if -bem was used, read a message from stdin. */
4324
4325 if (expansion_test)
4326   {
4327   if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4328     {
4329     uschar spoolname[256];  /* Not big_buffer; used in spool_read_header() */
4330     if (!admin_user)
4331       {
4332       fprintf(stderr, "exim: permission denied\n");
4333       exit(EXIT_FAILURE);
4334       }
4335     message_id = argv[msg_action_arg];
4336     (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4337     if (!spool_open_datafile(message_id))
4338       printf ("Failed to load message datafile %s\n", message_id);
4339     if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4340       printf ("Failed to load message %s\n", message_id);
4341     }
4342
4343   /* Read a test message from a file. We fudge it up to be on stdin, saving
4344   stdin itself for later reading of expansion strings. */
4345
4346   else if (expansion_test_message != NULL)
4347     {
4348     int save_stdin = dup(0);
4349     int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4350     if (fd < 0)
4351       {
4352       fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4353         strerror(errno));
4354       return EXIT_FAILURE;
4355       }
4356     (void) dup2(fd, 0);
4357     filter_test = FTEST_USER;      /* Fudge to make it look like filter test */
4358     message_ended = END_NOTENDED;
4359     read_message_body(receive_msg(extract_recipients));
4360     message_linecount += body_linecount;
4361     (void)dup2(save_stdin, 0);
4362     (void)close(save_stdin);
4363     clearerr(stdin);               /* Required by Darwin */
4364     }
4365
4366   /* Allow $recipients for this testing */
4367
4368   enable_dollar_recipients = TRUE;
4369
4370   /* Expand command line items */
4371
4372   if (recipients_arg < argc)
4373     {
4374     while (recipients_arg < argc)
4375       {
4376       uschar *s = argv[recipients_arg++];
4377       uschar *ss = expand_string(s);
4378       if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4379       else printf("%s\n", CS ss);
4380       }
4381     }
4382
4383   /* Read stdin */
4384
4385   else
4386     {
4387     char *(*fn_readline)(char *) = NULL;
4388     char *(*fn_addhist)(char *) = NULL;
4389
4390     #ifdef USE_READLINE
4391     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4392     #endif
4393
4394     for (;;)
4395       {
4396       uschar *ss;
4397       uschar *source = get_stdinput(fn_readline, fn_addhist);
4398       if (source == NULL) break;
4399       ss = expand_string(source);
4400       if (ss == NULL)
4401         printf ("Failed: %s\n", expand_string_message);
4402       else printf("%s\n", CS ss);
4403       }
4404
4405     #ifdef USE_READLINE
4406     if (dlhandle != NULL) dlclose(dlhandle);
4407     #endif
4408     }
4409
4410   /* The data file will be open after -Mset */
4411
4412   if (deliver_datafile >= 0)
4413     {
4414     (void)close(deliver_datafile);
4415     deliver_datafile = -1;
4416     }
4417
4418   exim_exit(EXIT_SUCCESS);
4419   }
4420
4421
4422 /* The active host name is normally the primary host name, but it can be varied
4423 for hosts that want to play several parts at once. We need to ensure that it is
4424 set for host checking, and for receiving messages. */
4425
4426 smtp_active_hostname = primary_hostname;
4427 if (raw_active_hostname != NULL)
4428   {
4429   uschar *nah = expand_string(raw_active_hostname);
4430   if (nah == NULL)
4431     {
4432     if (!expand_string_forcedfail)
4433       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4434         "(smtp_active_hostname): %s", raw_active_hostname,
4435         expand_string_message);
4436     }
4437   else if (nah[0] != 0) smtp_active_hostname = nah;
4438   }
4439
4440 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4441 given IP address so that the blocking and relay configuration can be tested.
4442 Unless a sender_ident was set by -oMt, we discard it (the default is the
4443 caller's login name). An RFC 1413 call is made only if we are running in the
4444 test harness and an incoming interface and both ports are specified, because
4445 there is no TCP/IP call to find the ident for. */
4446
4447 if (host_checking)
4448   {
4449   int x[4];
4450   int size;
4451
4452   if (!sender_ident_set)
4453     {
4454     sender_ident = NULL;
4455     if (running_in_test_harness && sender_host_port != 0 &&
4456         interface_address != NULL && interface_port != 0)
4457       verify_get_ident(1413);
4458     }
4459
4460   /* In case the given address is a non-canonical IPv6 address, canonicize
4461   it. The code works for both IPv4 and IPv6, as it happens. */
4462
4463   size = host_aton(sender_host_address, x);
4464   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4465   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4466
4467   /* Now set up for testing */
4468
4469   host_build_sender_fullhost();
4470   smtp_input = TRUE;
4471   smtp_in = stdin;
4472   smtp_out = stdout;
4473   sender_local = FALSE;
4474   sender_host_notsocket = TRUE;
4475   debug_file = stderr;
4476   debug_fd = fileno(debug_file);
4477   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4478     "**** but without any ident (RFC 1413) callback.\n"
4479     "**** This is not for real!\n\n",
4480       sender_host_address);
4481
4482   if (verify_check_host(&hosts_connection_nolog) == OK)
4483     log_write_selector &= ~L_smtp_connection;
4484   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4485
4486   /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4487   because a log line has already been written for all its failure exists
4488   (usually "connection refused: <reason>") and writing another one is
4489   unnecessary clutter. */
4490
4491   if (smtp_start_session())
4492     {
4493     reset_point = store_get(0);
4494     for (;;)
4495       {
4496       store_reset(reset_point);
4497       if (smtp_setup_msg() <= 0) break;
4498       if (!receive_msg(FALSE)) break;
4499       }
4500     smtp_log_no_mail();
4501     }
4502   exim_exit(EXIT_SUCCESS);
4503   }
4504
4505
4506 /* Arrange for message reception if recipients or SMTP were specified;
4507 otherwise complain unless a version print (-bV) happened or this is a filter
4508 verification test. In the former case, show the configuration file name. */
4509
4510 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4511   {
4512   if (version_printed)
4513     {
4514     printf("Configuration file is %s\n", config_main_filename);
4515     return EXIT_SUCCESS;
4516     }
4517
4518   if (filter_test == FTEST_NONE)
4519     exim_usage(called_as);
4520   }
4521
4522
4523 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4524 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4525 that we are not called from inetd, because that is rejected above. The
4526 following configuration settings are forced here:
4527
4528   (1) Synchronous delivery (-odi)
4529   (2) Errors to stderr (-oep == -oeq)
4530   (3) No parallel remote delivery
4531   (4) Unprivileged delivery
4532
4533 We don't force overall queueing options because there are several of them;
4534 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4535 to override any SMTP queueing. */
4536
4537 if (mua_wrapper)
4538   {
4539   synchronous_delivery = TRUE;
4540   arg_error_handling = ERRORS_STDERR;
4541   remote_max_parallel = 1;
4542   deliver_drop_privilege = TRUE;
4543   queue_smtp = FALSE;
4544   queue_smtp_domains = NULL;
4545   }
4546
4547
4548 /* Prepare to accept one or more new messages on the standard input. When a
4549 message has been read, its id is returned in message_id[]. If doing immediate
4550 delivery, we fork a delivery process for each received message, except for the
4551 last one, where we can save a process switch.
4552
4553 It is only in non-smtp mode that error_handling is allowed to be changed from
4554 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4555 sendmail error modes other than -oem ever actually used? Later: yes.) */
4556
4557 if (!smtp_input) error_handling = arg_error_handling;
4558
4559 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4560 logging being sent down the socket and make an identd call to get the
4561 sender_ident. */
4562
4563 else if (is_inetd)
4564   {
4565   (void)fclose(stderr);
4566   exim_nullstd();                       /* Re-open to /dev/null */
4567   verify_get_ident(IDENT_PORT);
4568   host_build_sender_fullhost();
4569   set_process_info("handling incoming connection from %s via inetd",
4570     sender_fullhost);
4571   }
4572
4573 /* If the sender host address has been set, build sender_fullhost if it hasn't
4574 already been done (which it will have been for inetd). This caters for the
4575 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4576 so that the test for IP options is skipped for -bs input. */
4577
4578 if (sender_host_address != NULL && sender_fullhost == NULL)
4579   {
4580   host_build_sender_fullhost();
4581   set_process_info("handling incoming connection from %s via -oMa",
4582     sender_fullhost);
4583   sender_host_notsocket = TRUE;
4584   }
4585
4586 /* Otherwise, set the sender host as unknown except for inetd calls. This
4587 prevents host checking in the case of -bs not from inetd and also for -bS. */
4588
4589 else if (!is_inetd) sender_host_unknown = TRUE;
4590
4591 /* If stdout does not exist, then dup stdin to stdout. This can happen
4592 if exim is started from inetd. In this case fd 0 will be set to the socket,
4593 but fd 1 will not be set. This also happens for passed SMTP channels. */
4594
4595 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4596
4597 /* Set up the incoming protocol name and the state of the program. Root is
4598 allowed to force received protocol via the -oMr option above. If we have come
4599 via inetd, the process info has already been set up. We don't set
4600 received_protocol here for smtp input, as it varies according to
4601 batch/HELO/EHLO/AUTH/TLS. */
4602
4603 if (smtp_input)
4604   {
4605   if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4606     smtp_batched_input? "batched " : "",
4607     (sender_address!= NULL)? sender_address : originator_login);
4608   }
4609 else
4610   {
4611   if (received_protocol == NULL)
4612     received_protocol = string_sprintf("local%s", called_as);
4613   set_process_info("accepting a local non-SMTP message from <%s>",
4614     sender_address);
4615   }
4616
4617 /* Initialize the session_local_queue-only flag (this will be ignored if
4618 mua_wrapper is set) */
4619
4620 queue_check_only();
4621 session_local_queue_only = queue_only;
4622
4623 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4624 the spool if so configured. On failure, we must not attempt to send an error
4625 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4626 error code is given.) */
4627
4628 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4629   {
4630   fprintf(stderr, "exim: insufficient disk space\n");
4631   return EXIT_FAILURE;
4632   }
4633
4634 /* If this is smtp input of any kind, real or batched, handle the start of the
4635 SMTP session.
4636
4637 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4638 because a log line has already been written for all its failure exists
4639 (usually "connection refused: <reason>") and writing another one is
4640 unnecessary clutter. */
4641
4642 if (smtp_input)
4643   {
4644   smtp_in = stdin;
4645   smtp_out = stdout;
4646   if (verify_check_host(&hosts_connection_nolog) == OK)
4647     log_write_selector &= ~L_smtp_connection;
4648   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4649   if (!smtp_start_session())
4650     {
4651     mac_smtp_fflush();
4652     exim_exit(EXIT_SUCCESS);
4653     }
4654   }
4655
4656 /* Otherwise, set up the input size limit here. */
4657
4658 else
4659   {
4660   thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4661   if (expand_string_message != NULL)
4662     {
4663     if (thismessage_size_limit == -1)
4664       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4665         "message_size_limit: %s", expand_string_message);
4666     else
4667       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4668         "message_size_limit: %s", expand_string_message);
4669     }
4670   }
4671
4672 /* Loop for several messages when reading SMTP input. If we fork any child
4673 processes, we don't want to wait for them unless synchronous delivery is
4674 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4675 same as SIG_DFL, despite the fact that documentation often lists the default as
4676 "ignore". This is a confusing area. This is what I know:
4677
4678 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4679 processes that complete simply to go away without ever becoming defunct. You
4680 can't then wait for them - but we don't want to wait for them in the
4681 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4682 happen for all OS (e.g. *BSD is different).
4683
4684 But that's not the end of the story. Some (many? all?) systems have the
4685 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4686 has by default, so it seems that the difference is merely one of default
4687 (compare restarting vs non-restarting signals).
4688
4689 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4690 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4691 of the loop below. Paranoia rules.
4692
4693 February 2003: That's *still* not the end of the story. There are now versions
4694 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4695 process then calls waitpid(), a grumble is written to the system log, because
4696 this is logically inconsistent. In other words, it doesn't like the paranoia.
4697 As a consequenc of this, the waitpid() below is now excluded if we are sure
4698 that SIG_IGN works. */
4699
4700 if (!synchronous_delivery)
4701   {
4702   #ifdef SA_NOCLDWAIT
4703   struct sigaction act;
4704   act.sa_handler = SIG_IGN;
4705   sigemptyset(&(act.sa_mask));
4706   act.sa_flags = SA_NOCLDWAIT;
4707   sigaction(SIGCHLD, &act, NULL);
4708   #else
4709   signal(SIGCHLD, SIG_IGN);
4710   #endif
4711   }
4712
4713 /* Save the current store pool point, for resetting at the start of
4714 each message, and save the real sender address, if any. */
4715
4716 reset_point = store_get(0);
4717 real_sender_address = sender_address;
4718
4719 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4720 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4721 collapsed). */
4722
4723 while (more)
4724   {
4725   store_reset(reset_point);
4726   message_id[0] = 0;
4727
4728   /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4729   input and build the recipients list, before calling receive_msg() to read the
4730   message proper. Whatever sender address is given in the SMTP transaction is
4731   often ignored for local senders - we use the actual sender, which is normally
4732   either the underlying user running this process or a -f argument provided by
4733   a trusted caller. It is saved in real_sender_address. The test for whether to
4734   accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4735
4736   if (smtp_input)
4737     {
4738     int rc;
4739     if ((rc = smtp_setup_msg()) > 0)
4740       {
4741       if (real_sender_address != NULL &&
4742           !receive_check_set_sender(sender_address))
4743         {
4744         sender_address = raw_sender = real_sender_address;
4745         sender_address_unrewritten = NULL;
4746         }
4747
4748       /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4749       isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4750       the very end. The result of the ACL is ignored (as for other non-SMTP
4751       messages). It is run for its potential side effects. */
4752
4753       if (smtp_batched_input && acl_not_smtp_start != NULL)
4754         {
4755         uschar *user_msg, *log_msg;
4756         enable_dollar_recipients = TRUE;
4757         (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4758           &user_msg, &log_msg);
4759         enable_dollar_recipients = FALSE;
4760         }
4761
4762       /* Now get the data for the message */
4763
4764       more = receive_msg(extract_recipients);
4765       if (message_id[0] == 0)
4766         {
4767         if (more) continue;
4768         smtp_log_no_mail();               /* Log no mail if configured */
4769         exim_exit(EXIT_FAILURE);
4770         }
4771       }
4772     else
4773       {
4774       smtp_log_no_mail();               /* Log no mail if configured */
4775       exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4776       }
4777     }
4778
4779   /* In the non-SMTP case, we have all the information from the command
4780   line, but must process it in case it is in the more general RFC822
4781   format, and in any case, to detect syntax errors. Also, it appears that
4782   the use of comma-separated lists as single arguments is common, so we
4783   had better support them. */
4784
4785   else
4786     {
4787     int i;
4788     int rcount = 0;
4789     int count = argc - recipients_arg;
4790     uschar **list = argv + recipients_arg;
4791
4792     /* These options cannot be changed dynamically for non-SMTP messages */
4793
4794     active_local_sender_retain = local_sender_retain;
4795     active_local_from_check = local_from_check;
4796
4797     /* Save before any rewriting */
4798
4799     raw_sender = string_copy(sender_address);
4800
4801     /* Loop for each argument */
4802
4803     for (i = 0; i < count; i++)
4804       {
4805       int start, end, domain;
4806       uschar *errmess;
4807       uschar *s = list[i];
4808
4809       /* Loop for each comma-separated address */
4810
4811       while (*s != 0)
4812         {
4813         BOOL finished = FALSE;
4814         uschar *recipient;
4815         uschar *ss = parse_find_address_end(s, FALSE);
4816
4817         if (*ss == ',') *ss = 0; else finished = TRUE;
4818
4819         /* Check max recipients - if -t was used, these aren't recipients */
4820
4821         if (recipients_max > 0 && ++rcount > recipients_max &&
4822             !extract_recipients)
4823           {
4824           if (error_handling == ERRORS_STDERR)
4825             {
4826             fprintf(stderr, "exim: too many recipients\n");
4827             exim_exit(EXIT_FAILURE);
4828             }
4829           else
4830             {
4831             return
4832               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4833                 errors_sender_rc : EXIT_FAILURE;
4834             }
4835           }
4836
4837         recipient =
4838           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4839
4840         if (domain == 0 && !allow_unqualified_recipient)
4841           {
4842           recipient = NULL;
4843           errmess = US"unqualified recipient address not allowed";
4844           }
4845
4846         if (recipient == NULL)
4847           {
4848           if (error_handling == ERRORS_STDERR)
4849             {
4850             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4851               string_printing(list[i]), errmess);
4852             exim_exit(EXIT_FAILURE);
4853             }
4854           else
4855             {
4856             error_block eblock;
4857             eblock.next = NULL;
4858             eblock.text1 = string_printing(list[i]);
4859             eblock.text2 = errmess;
4860             return
4861               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4862                 errors_sender_rc : EXIT_FAILURE;
4863             }
4864           }
4865
4866         receive_add_recipient(recipient, -1);
4867         s = ss;
4868         if (!finished)
4869           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4870         }
4871       }
4872
4873     /* Show the recipients when debugging */
4874
4875     DEBUG(D_receive)
4876       {
4877       int i;
4878       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4879       if (recipients_list != NULL)
4880         {
4881         debug_printf("Recipients:\n");
4882         for (i = 0; i < recipients_count; i++)
4883           debug_printf("  %s\n", recipients_list[i].address);
4884         }
4885       }
4886
4887     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4888     ignored; rejecting here would just add complication, and it can just as
4889     well be done later. Allow $recipients to be visible in the ACL. */
4890
4891     if (acl_not_smtp_start != NULL)
4892       {
4893       uschar *user_msg, *log_msg;
4894       enable_dollar_recipients = TRUE;
4895       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4896         &user_msg, &log_msg);
4897       enable_dollar_recipients = FALSE;
4898       }
4899
4900     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4901     will just read the headers for the message, and not write anything onto the
4902     spool. */
4903
4904     message_ended = END_NOTENDED;
4905     more = receive_msg(extract_recipients);
4906
4907     /* more is always FALSE here (not SMTP message) when reading a message
4908     for real; when reading the headers of a message for filter testing,
4909     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4910
4911     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4912     }  /* Non-SMTP message reception */
4913
4914   /* If this is a filter testing run, there are headers in store, but
4915   no message on the spool. Run the filtering code in testing mode, setting
4916   the domain to the qualify domain and the local part to the current user,
4917   unless they have been set by options. The prefix and suffix are left unset
4918   unless specified. The the return path is set to to the sender unless it has
4919   already been set from a return-path header in the message. */
4920
4921   if (filter_test != FTEST_NONE)
4922     {
4923     deliver_domain = (ftest_domain != NULL)?
4924       ftest_domain : qualify_domain_recipient;
4925     deliver_domain_orig = deliver_domain;
4926     deliver_localpart = (ftest_localpart != NULL)?
4927       ftest_localpart : originator_login;
4928     deliver_localpart_orig = deliver_localpart;
4929     deliver_localpart_prefix = ftest_prefix;
4930     deliver_localpart_suffix = ftest_suffix;
4931     deliver_home = originator_home;
4932
4933     if (return_path == NULL)
4934       {
4935       printf("Return-path copied from sender\n");
4936       return_path = string_copy(sender_address);
4937       }
4938     else
4939       {
4940       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4941       }
4942     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4943
4944     receive_add_recipient(
4945       string_sprintf("%s%s%s@%s",
4946         (ftest_prefix == NULL)? US"" : ftest_prefix,
4947         deliver_localpart,
4948         (ftest_suffix == NULL)? US"" : ftest_suffix,
4949         deliver_domain), -1);
4950
4951     printf("Recipient   = %s\n", recipients_list[0].address);
4952     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4953     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4954
4955     (void)chdir("/");   /* Get away from wherever the user is running this from */
4956
4957     /* Now we run either a system filter test, or a user filter test, or both.
4958     In the latter case, headers added by the system filter will persist and be
4959     available to the user filter. We need to copy the filter variables
4960     explicitly. */
4961
4962     if ((filter_test & FTEST_SYSTEM) != 0)
4963       {
4964       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4965         exim_exit(EXIT_FAILURE);
4966       }
4967
4968     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4969
4970     if ((filter_test & FTEST_USER) != 0)
4971       {
4972       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4973         exim_exit(EXIT_FAILURE);
4974       }
4975
4976     exim_exit(EXIT_SUCCESS);
4977     }
4978
4979   /* Else act on the result of message reception. We should not get here unless
4980   message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4981   will be TRUE. If it is not, check on the number of messages received in this
4982   connection. */
4983
4984   if (!session_local_queue_only &&
4985       smtp_accept_queue_per_connection > 0 &&
4986       receive_messagecount > smtp_accept_queue_per_connection)
4987     {
4988     session_local_queue_only = TRUE;
4989     queue_only_reason = 2;
4990     }
4991
4992   /* Initialize local_queue_only from session_local_queue_only. If it is false,
4993   and queue_only_load is set, check that the load average is below it. If it is
4994   not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4995   default), we put the whole session into queue_only mode. It then remains this
4996   way for any subsequent messages on the same SMTP connection. This is a
4997   deliberate choice; even though the load average may fall, it doesn't seem
4998   right to deliver later messages on the same call when not delivering earlier
4999   ones. However, there are odd cases where this is not wanted, so this can be
5000   changed by setting queue_only_load_latch false. */
5001
5002   local_queue_only = session_local_queue_only;
5003   if (!local_queue_only && queue_only_load >= 0)
5004     {
5005     local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5006     if (local_queue_only)
5007       {
5008       queue_only_reason = 3;
5009       if (queue_only_load_latch) session_local_queue_only = TRUE;
5010       }
5011     }
5012
5013   /* If running as an MUA wrapper, all queueing options and freezing options
5014   are ignored. */
5015
5016   if (mua_wrapper)
5017     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5018
5019   /* Log the queueing here, when it will get a message id attached, but
5020   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5021   connections). */
5022
5023   if (local_queue_only) switch(queue_only_reason)
5024     {
5025     case 2:
5026     log_write(L_delay_delivery,
5027               LOG_MAIN, "no immediate delivery: more than %d messages "
5028       "received in one connection", smtp_accept_queue_per_connection);
5029     break;
5030
5031     case 3:
5032     log_write(L_delay_delivery,
5033               LOG_MAIN, "no immediate delivery: load average %.2f",
5034               (double)load_average/1000.0);
5035     break;
5036     }
5037
5038   /* Else do the delivery unless the ACL or local_scan() called for queue only
5039   or froze the message. Always deliver in a separate process. A fork failure is
5040   not a disaster, as the delivery will eventually happen on a subsequent queue
5041   run. The search cache must be tidied before the fork, as the parent will
5042   do it before exiting. The child will trigger a lookup failure and
5043   thereby defer the delivery if it tries to use (for example) a cached ldap
5044   connection that the parent has called unbind on. */
5045
5046   else if (!queue_only_policy && !deliver_freeze)
5047     {
5048     pid_t pid;
5049     search_tidyup();
5050
5051     if ((pid = fork()) == 0)
5052       {
5053       int rc;
5054       close_unwanted();      /* Close unwanted file descriptors and TLS */
5055       exim_nullstd();        /* Ensure std{in,out,err} exist */
5056
5057       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5058       mode, deliver_drop_privilege is forced TRUE). */
5059
5060       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5061         {
5062         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5063           message_id);
5064         /* Control does not return here. */
5065         }
5066
5067       /* No need to re-exec */
5068
5069       rc = deliver_message(message_id, FALSE, FALSE);
5070       search_tidyup();
5071       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5072         EXIT_SUCCESS : EXIT_FAILURE);
5073       }
5074
5075     if (pid < 0)
5076       {
5077       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5078         "process: %s", strerror(errno));
5079       }
5080
5081     /* In the parent, wait if synchronous delivery is required. This will
5082     always be the case in MUA wrapper mode. */
5083
5084     else if (synchronous_delivery)
5085       {
5086       int status;
5087       while (wait(&status) != pid);
5088       if ((status & 0x00ff) != 0)
5089         log_write(0, LOG_MAIN|LOG_PANIC,
5090           "process %d crashed with signal %d while delivering %s",
5091           (int)pid, status & 0x00ff, message_id);
5092       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5093       }
5094     }
5095
5096   /* The loop will repeat if more is TRUE. If we do not know know that the OS
5097   automatically reaps children (see comments above the loop), clear away any
5098   finished subprocesses here, in case there are lots of messages coming in
5099   from the same source. */
5100
5101   #ifndef SIG_IGN_WORKS
5102   while (waitpid(-1, NULL, WNOHANG) > 0);
5103   #endif
5104   }
5105
5106 exim_exit(EXIT_SUCCESS);   /* Never returns */
5107 return 0;                  /* To stop compiler warning */
5108 }
5109
5110 /* End of exim.c */