src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.60 2008/01/17 13:03:35 tom Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2007 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17
  18
  19 /*************************************************
  20 *      Function interface to store functions     *
  21 *************************************************/
  22
  23 /* We need some real functions to pass to the PCRE regular expression library
  24 for store allocation via Exim's store manager. The normal calls are actually
  25 macros that pass over location information to make tracing easier. These
  26 functions just interface to the standard macro calls. A good compiler will
  27 optimize out the tail recursion and so not make them too expensive. There
  28 are two sets of functions; one for use when we want to retain the compiled
  29 regular expression for a long time; the other for short-term use. */
  30
  31 static void *
  32 function_store_get(size_t size)
  33 {
  34 return store_get((int)size);
  35 }
  36
  37 static void
  38 function_dummy_free(void *block) { block = block; }
  39
  40 static void *
  41 function_store_malloc(size_t size)
  42 {
  43 return store_malloc((int)size);
  44 }
  45
  46 static void
  47 function_store_free(void *block)
  48 {
  49 store_free(block);
  50 }
  51
  52
  53
  54
  55 /*************************************************
  56 *  Compile regular expression and panic on fail  *
  57 *************************************************/
  58
  59 /* This function is called when failure to compile a regular expression leads
  60 to a panic exit. In other cases, pcre_compile() is called directly. In many
  61 cases where this function is used, the results of the compilation are to be
  62 placed in long-lived store, so we temporarily reset the store management
  63 functions that PCRE uses if the use_malloc flag is set.
  64
  65 Argument:
  66   pattern     the pattern to compile
  67   caseless    TRUE if caseless matching is required
  68   use_malloc  TRUE if compile into malloc store
  69
  70 Returns:      pointer to the compiled pattern
  71 */
  72
  73 const pcre *
  74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  75 {
  76 int offset;
  77 int options = PCRE_COPT;
  78 const pcre *yield;
  79 const uschar *error;
  80 if (use_malloc)
  81   {
  82   pcre_malloc = function_store_malloc;
  83   pcre_free = function_store_free;
  84   }
  85 if (caseless) options |= PCRE_CASELESS;
  86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  87 pcre_malloc = function_store_get;
  88 pcre_free = function_dummy_free;
  89 if (yield == NULL)
  90   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  91     "%s at offset %d while compiling %s", error, offset, pattern);
  92 return yield;
  93 }
  94
  95
  96
  97
  98 /*************************************************
  99 *   Execute regular expression and set strings   *
 100 *************************************************/
 101
 102 /* This function runs a regular expression match, and sets up the pointers to
 103 the matched substrings.
 104
 105 Arguments:
 106   re          the compiled expression
 107   subject     the subject string
 108   options     additional PCRE options
 109   setup       if < 0 do full setup
 110               if >= 0 setup from setup+1 onwards,
 111                 excluding the full matched string
 112
 113 Returns:      TRUE or FALSE
 114 */
 115
 116 BOOL
 117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 118 {
 119 int ovector[3*(EXPAND_MAXN+1)];
 120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 121   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 122 BOOL yield = n >= 0;
 123 if (n == 0) n = EXPAND_MAXN + 1;
 124 if (yield)
 125   {
 126   int nn;
 127   expand_nmax = (setup < 0)? 0 : setup + 1;
 128   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 129     {
 130     expand_nstring[expand_nmax] = subject + ovector[nn];
 131     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 132     }
 133   expand_nmax--;
 134   }
 135 return yield;
 136 }
 137
 138
 139
 140
 141 /*************************************************
 142 *             Handler for SIGUSR1                *
 143 *************************************************/
 144
 145 /* SIGUSR1 causes any exim process to write to the process log details of
 146 what it is currently doing. It will only be used if the OS is capable of
 147 setting up a handler that causes automatic restarting of any system call
 148 that is in progress at the time.
 149
 150 Argument: the signal number (SIGUSR1)
 151 Returns:  nothing
 152 */
 153
 154 static void
 155 usr1_handler(int sig)
 156 {
 157 sig = sig;      /* Keep picky compilers happy */
 158 log_write(0, LOG_PROCESS, "%s", process_info);
 159 log_close_all();
 160 os_restarting_signal(SIGUSR1, usr1_handler);
 161 }
 162
 163
 164
 165 /*************************************************
 166 *             Timeout handler                    *
 167 *************************************************/
 168
 169 /* This handler is enabled most of the time that Exim is running. The handler
 170 doesn't actually get used unless alarm() has been called to set a timer, to
 171 place a time limit on a system call of some kind. When the handler is run, it
 172 re-enables itself.
 173
 174 There are some other SIGALRM handlers that are used in special cases when more
 175 than just a flag setting is required; for example, when reading a message's
 176 input. These are normally set up in the code module that uses them, and the
 177 SIGALRM handler is reset to this one afterwards.
 178
 179 Argument: the signal value (SIGALRM)
 180 Returns:  nothing
 181 */
 182
 183 void
 184 sigalrm_handler(int sig)
 185 {
 186 sig = sig;      /* Keep picky compilers happy */
 187 sigalrm_seen = TRUE;
 188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 189 }
 190
 191
 192
 193 /*************************************************
 194 *      Sleep for a fractional time interval      *
 195 *************************************************/
 196
 197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 198 period of time that may include a fraction of a second. The coding is somewhat
 199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 200 will wait for ever, so we panic in this instance. (There was a case of this
 201 when a bug in a function that calls milliwait() caused it to pass invalid data.
 202 That's when I added the check. :-)
 203
 204 Argument:  an itimerval structure containing the interval
 205 Returns:   nothing
 206 */
 207
 208 static void
 209 milliwait(struct itimerval *itval)
 210 {
 211 sigset_t sigmask;
 212 sigset_t old_sigmask;
 213 (void)sigemptyset(&sigmask);                           /* Empty mask */
 214 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 216 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 217   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 218     "setitimer() failed: %s", strerror(errno));
 219 (void)sigfillset(&sigmask);                            /* All signals */
 220 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 221 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 223 }
 224
 225
 226
 227
 228 /*************************************************
 229 *         Millisecond sleep function             *
 230 *************************************************/
 231
 232 /* The basic sleep() function has a granularity of 1 second, which is too rough
 233 in some cases - for example, when using an increasing delay to slow down
 234 spammers.
 235
 236 Argument:    number of millseconds
 237 Returns:     nothing
 238 */
 239
 240 void
 241 millisleep(int msec)
 242 {
 243 struct itimerval itval;
 244 itval.it_interval.tv_sec = 0;
 245 itval.it_interval.tv_usec = 0;
 246 itval.it_value.tv_sec = msec/1000;
 247 itval.it_value.tv_usec = (msec % 1000) * 1000;
 248 milliwait(&itval);
 249 }
 250
 251
 252
 253 /*************************************************
 254 *         Compare microsecond times              *
 255 *************************************************/
 256
 257 /*
 258 Arguments:
 259   tv1         the first time
 260   tv2         the second time
 261
 262 Returns:      -1, 0, or +1
 263 */
 264
 265 int
 266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 267 {
 268 if (t1->tv_sec > t2->tv_sec) return +1;
 269 if (t1->tv_sec < t2->tv_sec) return -1;
 270 if (t1->tv_usec > t2->tv_usec) return +1;
 271 if (t1->tv_usec < t2->tv_usec) return -1;
 272 return 0;
 273 }
 274
 275
 276
 277
 278 /*************************************************
 279 *          Clock tick wait function              *
 280 *************************************************/
 281
 282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 283 message IDs, and in file names for maildir deliveries. Because some OS now
 284 re-use pids within the same second, sub-second times are now being used.
 285 However, for absolute certaintly, we must ensure the clock has ticked before
 286 allowing the relevant process to complete. At the time of implementation of
 287 this code (February 2003), the speed of processors is such that the clock will
 288 invariably have ticked already by the time a process has done its job. This
 289 function prepares for the time when things are faster - and it also copes with
 290 clocks that go backwards.
 291
 292 Arguments:
 293   then_tv      A timeval which was used to create uniqueness; its usec field
 294                  has been rounded down to the value of the resolution.
 295                  We want to be sure the current time is greater than this.
 296   resolution   The resolution that was used to divide the microseconds
 297                  (1 for maildir, larger for message ids)
 298
 299 Returns:       nothing
 300 */
 301
 302 void
 303 exim_wait_tick(struct timeval *then_tv, int resolution)
 304 {
 305 struct timeval now_tv;
 306 long int now_true_usec;
 307
 308 (void)gettimeofday(&now_tv, NULL);
 309 now_true_usec = now_tv.tv_usec;
 310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 311
 312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 313   {
 314   struct itimerval itval;
 315   itval.it_interval.tv_sec = 0;
 316   itval.it_interval.tv_usec = 0;
 317   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 318   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 319
 320   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 321   negative value for the microseconds is possible only in the case when "now"
 322   is more than a second less than "then". That means that itval.it_value.tv_sec
 323   is greater than zero. The following correction is therefore safe. */
 324
 325   if (itval.it_value.tv_usec < 0)
 326     {
 327     itval.it_value.tv_usec += 1000000;
 328     itval.it_value.tv_sec -= 1;
 329     }
 330
 331   DEBUG(D_transport|D_receive)
 332     {
 333     if (!running_in_test_harness)
 334       {
 335       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 336         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 337       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 338         itval.it_value.tv_usec);
 339       }
 340     }
 341
 342   milliwait(&itval);
 343   }
 344 }
 345
 346
 347
 348
 349 /*************************************************
 350 *            Set up processing details           *
 351 *************************************************/
 352
 353 /* Save a text string for dumping when SIGUSR1 is received.
 354 Do checks for overruns.
 355
 356 Arguments: format and arguments, as for printf()
 357 Returns:   nothing
 358 */
 359
 360 void
 361 set_process_info(char *format, ...)
 362 {
 363 int len;
 364 va_list ap;
 365 sprintf(CS process_info, "%5d ", (int)getpid());
 366 len = Ustrlen(process_info);
 367 va_start(ap, format);
 368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 369   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 371 va_end(ap);
 372 }
 373
 374
 375
 376
 377
 378 /*************************************************
 379 *   Call fopen() with umask 777 and adjust mode  *
 380 *************************************************/
 381
 382 /* Exim runs with umask(0) so that files created with open() have the mode that
 383 is specified in the open() call. However, there are some files, typically in
 384 the spool directory, that are created with fopen(). They end up world-writeable
 385 if no precautions are taken. Although the spool directory is not accessible to
 386 the world, this is an untidiness. So this is a wrapper function for fopen()
 387 that sorts out the mode of the created file.
 388
 389 Arguments:
 390    filename       the file name
 391    options        the fopen() options
 392    mode           the required mode
 393
 394 Returns:          the fopened FILE or NULL
 395 */
 396
 397 FILE *
 398 modefopen(uschar *filename, char *options, mode_t mode)
 399 {
 400 mode_t saved_umask = umask(0777);
 401 FILE *f = Ufopen(filename, options);
 402 (void)umask(saved_umask);
 403 if (f != NULL) (void)fchmod(fileno(f), mode);
 404 return f;
 405 }
 406
 407
 408
 409
 410 /*************************************************
 411 *   Ensure stdin, stdout, and stderr exist       *
 412 *************************************************/
 413
 414 /* Some operating systems grumble if an exec() happens without a standard
 415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 416 file will be opened and will use these fd values, and then some other bit of
 417 code will assume, for example, that it can write error messages to stderr.
 418 This function ensures that fds 0, 1, and 2 are open if they do not already
 419 exist, by connecting them to /dev/null.
 420
 421 This function is also used to ensure that std{in,out,err} exist at all times,
 422 so that if any library that Exim calls tries to use them, it doesn't crash.
 423
 424 Arguments:  None
 425 Returns:    Nothing
 426 */
 427
 428 void
 429 exim_nullstd(void)
 430 {
 431 int i;
 432 int devnull = -1;
 433 struct stat statbuf;
 434 for (i = 0; i <= 2; i++)
 435   {
 436   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 437     {
 438     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 439     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 440       string_open_failed(errno, "/dev/null"));
 441     if (devnull != i) (void)dup2(devnull, i);
 442     }
 443   }
 444 if (devnull > 2) (void)close(devnull);
 445 }
 446
 447
 448
 449
 450 /*************************************************
 451 *   Close unwanted file descriptors for delivery *
 452 *************************************************/
 453
 454 /* This function is called from a new process that has been forked to deliver
 455 an incoming message, either directly, or using exec.
 456
 457 We want any smtp input streams to be closed in this new process. However, it
 458 has been observed that using fclose() here causes trouble. When reading in -bS
 459 input, duplicate copies of messages have been seen. The files will be sharing a
 460 file pointer with the parent process, and it seems that fclose() (at least on
 461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 462 least sometimes. Hence we go for closing the underlying file descriptors.
 463
 464 If TLS is active, we want to shut down the TLS library, but without molesting
 465 the parent's SSL connection.
 466
 467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 468 stderr unless debugging) because the calling process might have set them up as
 469 pipes and be waiting for them to close before it waits for the submission
 470 process to terminate. If they aren't closed, they hold up the calling process
 471 until the initial delivery process finishes, which is not what we want.
 472
 473 Exception: We do want it for synchronous delivery!
 474
 475 And notwithstanding all the above, if D_resolver is set, implying resolver
 476 debugging, leave stdout open, because that's where the resolver writes its
 477 debugging output.
 478
 479 When we close stderr (which implies we've also closed stdout), we also get rid
 480 of any controlling terminal.
 481
 482 Arguments:   None
 483 Returns:     Nothing
 484 */
 485
 486 static void
 487 close_unwanted(void)
 488 {
 489 if (smtp_input)
 490   {
 491   #ifdef SUPPORT_TLS
 492   tls_close(FALSE);      /* Shut down the TLS library */
 493   #endif
 494   (void)close(fileno(smtp_in));
 495   (void)close(fileno(smtp_out));
 496   smtp_in = NULL;
 497   }
 498 else
 499   {
 500   (void)close(0);                                          /* stdin */
 501   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 502   if (debug_selector == 0)                                 /* stderr */
 503     {
 504     if (!synchronous_delivery)
 505       {
 506       (void)close(2);
 507       log_stderr = NULL;
 508       }
 509     (void)setsid();
 510     }
 511   }
 512 }
 513
 514
 515
 516
 517 /*************************************************
 518 *          Set uid and gid                       *
 519 *************************************************/
 520
 521 /* This function sets a new uid and gid permanently, optionally calling
 522 initgroups() to set auxiliary groups. There are some special cases when running
 523 Exim in unprivileged modes. In these situations the effective uid will not be
 524 root; if we already have the right effective uid/gid, and don't need to
 525 initialize any groups, leave things as they are.
 526
 527 Arguments:
 528   uid        the uid
 529   gid        the gid
 530   igflag     TRUE if initgroups() wanted
 531   msg        text to use in debugging output and failure log
 532
 533 Returns:     nothing; bombs out on failure
 534 */
 535
 536 void
 537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 538 {
 539 uid_t euid = geteuid();
 540 gid_t egid = getegid();
 541
 542 if (euid == root_uid || euid != uid || egid != gid || igflag)
 543   {
 544   /* At least one OS returns +1 for initgroups failure, so just check for
 545   non-zero. */
 546
 547   if (igflag)
 548     {
 549     struct passwd *pw = getpwuid(uid);
 550     if (pw != NULL)
 551       {
 552       if (initgroups(pw->pw_name, gid) != 0)
 553         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 554           (long int)uid, strerror(errno));
 555       }
 556     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 557       "no passwd entry for uid=%ld", (long int)uid);
 558     }
 559
 560   if (setgid(gid) < 0 || setuid(uid) < 0)
 561     {
 562     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 563       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 564     }
 565   }
 566
 567 /* Debugging output included uid/gid and all groups */
 568
 569 DEBUG(D_uid)
 570   {
 571   int group_count;
 572   gid_t group_list[NGROUPS_MAX];
 573   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 574     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 575   group_count = getgroups(NGROUPS_MAX, group_list);
 576   debug_printf("  auxiliary group list:");
 577   if (group_count > 0)
 578     {
 579     int i;
 580     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 581     }
 582   else debug_printf(" <none>");
 583   debug_printf("\n");
 584   }
 585 }
 586
 587
 588
 589
 590 /*************************************************
 591 *               Exit point                       *
 592 *************************************************/
 593
 594 /* Exim exits via this function so that it always clears up any open
 595 databases.
 596
 597 Arguments:
 598   rc         return code
 599
 600 Returns:     does not return
 601 */
 602
 603 void
 604 exim_exit(int rc)
 605 {
 606 search_tidyup();
 607 DEBUG(D_any)
 608   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 609     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 610 exit(rc);
 611 }
 612
 613
 614
 615
 616 /*************************************************
 617 *         Extract port from host address         *
 618 *************************************************/
 619
 620 /* Called to extract the port from the values given to -oMa and -oMi.
 621 It also checks the syntax of the address, and terminates it before the
 622 port data when a port is extracted.
 623
 624 Argument:
 625   address   the address, with possible port on the end
 626
 627 Returns:    the port, or zero if there isn't one
 628             bombs out on a syntax error
 629 */
 630
 631 static int
 632 check_port(uschar *address)
 633 {
 634 int port = host_address_extract_port(address);
 635 if (string_is_ip_address(address, NULL) == 0)
 636   {
 637   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 638   exit(EXIT_FAILURE);
 639   }
 640 return port;
 641 }
 642
 643
 644
 645 /*************************************************
 646 *              Test/verify an address            *
 647 *************************************************/
 648
 649 /* This function is called by the -bv and -bt code. It extracts a working
 650 address from a full RFC 822 address. This isn't really necessary per se, but it
 651 has the effect of collapsing source routes.
 652
 653 Arguments:
 654   s            the address string
 655   flags        flag bits for verify_address()
 656   exit_value   to be set for failures
 657
 658 Returns:       nothing
 659 */
 660
 661 static void
 662 test_address(uschar *s, int flags, int *exit_value)
 663 {
 664 int start, end, domain;
 665 uschar *parse_error = NULL;
 666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 667   FALSE);
 668 if (address == NULL)
 669   {
 670   fprintf(stdout, "syntax error: %s\n", parse_error);
 671   *exit_value = 2;
 672   }
 673 else
 674   {
 675   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 676     -1, -1, NULL, NULL, NULL);
 677   if (rc == FAIL) *exit_value = 2;
 678     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 679   }
 680 }
 681
 682
 683
 684 /*************************************************
 685 *         Decode bit settings for log/debug      *
 686 *************************************************/
 687
 688 /* This function decodes a string containing bit settings in the form of +name
 689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 690 also recognizes a numeric setting of the form =<number>, but this is not
 691 intended for user use. It's an easy way for Exim to pass the debug settings
 692 when it is re-exec'ed.
 693
 694 The log options are held in two unsigned ints (because there became too many
 695 for one). The top bit in the table means "put in 2nd selector". This does not
 696 yet apply to debug options, so the "=" facility sets only the first selector.
 697
 698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
 699 It sets all the bits in both selectors. However, there is a facility for then
 700 unsetting certain bits, because we want to turn off "memory" in the debug case.
 701
 702 A bad value for a debug setting is treated as an unknown option - error message
 703 to stderr and die. For log settings, which come from the configuration file,
 704 we write to the log on the way out...
 705
 706 Arguments:
 707   selector1      address of the first bit string
 708   selector2      address of the second bit string, or NULL
 709   notall1        bits to exclude from "all" for selector1
 710   notall2        bits to exclude from "all" for selector2
 711   string         the configured string
 712   options        the table of option names
 713   count          size of table
 714   which          "log" or "debug"
 715
 716 Returns:         nothing on success - bomb out on failure
 717 */
 718
 719 static void
 720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
 721   int notall2, uschar *string, bit_table *options, int count, uschar *which)
 722 {
 723 uschar *errmsg;
 724 if (string == NULL) return;
 725
 726 if (*string == '=')
 727   {
 728   char *end;    /* Not uschar */
 729   *selector1 = strtoul(CS string+1, &end, 0);
 730   if (*end == 0) return;
 731   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 732     string);
 733   goto ERROR_RETURN;
 734   }
 735
 736 /* Handle symbolic setting */
 737
 738 else for(;;)
 739   {
 740   BOOL adding;
 741   uschar *s;
 742   int len;
 743   bit_table *start, *end;
 744
 745   while (isspace(*string)) string++;
 746   if (*string == 0) return;
 747
 748   if (*string != '+' && *string != '-')
 749     {
 750     errmsg = string_sprintf("malformed %s_selector setting: "
 751       "+ or - expected but found \"%s\"", which, string);
 752     goto ERROR_RETURN;
 753     }
 754
 755   adding = *string++ == '+';
 756   s = string;
 757   while (isalnum(*string) || *string == '_') string++;
 758   len = string - s;
 759
 760   start = options;
 761   end = options + count;
 762
 763   while (start < end)
 764     {
 765     bit_table *middle = start + (end - start)/2;
 766     int c = Ustrncmp(s, middle->name, len);
 767     if (c == 0)
 768       {
 769       if (middle->name[len] != 0) c = -1; else
 770         {
 771         unsigned int bit = middle->bit;
 772         unsigned int *selector;
 773
 774         /* The value with all bits set means "force all bits in both selectors"
 775         in the case where two are being handled. However, the top bit in the
 776         second selector is never set. When setting, some bits can be excluded.
 777         */
 778
 779         if (bit == 0xffffffff)
 780           {
 781           if (adding)
 782             {
 783             *selector1 = 0xffffffff ^ notall1;
 784             if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
 785             }
 786           else
 787             {
 788             *selector1 = 0;
 789             if (selector2 != NULL) *selector2 = 0;
 790             }
 791           }
 792
 793         /* Otherwise, the 0x80000000 bit means "this value, without the top
 794         bit, belongs in the second selector". */
 795
 796         else
 797           {
 798           if ((bit & 0x80000000) != 0)
 799             {
 800             selector = selector2;
 801             bit &= 0x7fffffff;
 802             }
 803           else selector = selector1;
 804           if (adding) *selector |= bit; else *selector &= ~bit;
 805           }
 806         break;  /* Out of loop to match selector name */
 807         }
 808       }
 809     if (c < 0) end = middle; else start = middle + 1;
 810     }  /* Loop to match selector name */
 811
 812   if (start >= end)
 813     {
 814     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 815       adding? '+' : '-', len, s);
 816     goto ERROR_RETURN;
 817     }
 818   }    /* Loop for selector names */
 819
 820 /* Handle disasters */
 821
 822 ERROR_RETURN:
 823 if (Ustrcmp(which, "debug") == 0)
 824   {
 825   fprintf(stderr, "exim: %s\n", errmsg);
 826   exit(EXIT_FAILURE);
 827   }
 828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 829 }
 830
 831
 832
 833 /*************************************************
 834 *          Show supported features               *
 835 *************************************************/
 836
 837 /* This function is called for -bV and for -d to output the optional features
 838 of the current Exim binary.
 839
 840 Arguments:  a FILE for printing
 841 Returns:    nothing
 842 */
 843
 844 static void
 845 show_whats_supported(FILE *f)
 846 {
 847 #ifdef DB_VERSION_STRING
 848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 850   #ifdef USE_DB
 851   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 852   #else
 853   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 854   #endif
 855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 856 fprintf(f, "Probably ndbm\n");
 857 #elif defined(USE_TDB)
 858 fprintf(f, "Using tdb\n");
 859 #else
 860   #ifdef USE_GDBM
 861   fprintf(f, "Probably GDBM (native mode)\n");
 862   #else
 863   fprintf(f, "Probably GDBM (compatibility mode)\n");
 864   #endif
 865 #endif
 866
 867 fprintf(f, "Support for:");
 868 #ifdef SUPPORT_CRYPTEQ
 869   fprintf(f, " crypteq");
 870 #endif
 871 #if HAVE_ICONV
 872   fprintf(f, " iconv()");
 873 #endif
 874 #if HAVE_IPV6
 875   fprintf(f, " IPv6");
 876 #endif
 877 #ifdef HAVE_SETCLASSRESOURCES
 878   fprintf(f, " use_setclassresources");
 879 #endif
 880 #ifdef SUPPORT_PAM
 881   fprintf(f, " PAM");
 882 #endif
 883 #ifdef EXIM_PERL
 884   fprintf(f, " Perl");
 885 #endif
 886 #ifdef EXPAND_DLFUNC
 887   fprintf(f, " Expand_dlfunc");
 888 #endif
 889 #ifdef USE_TCP_WRAPPERS
 890   fprintf(f, " TCPwrappers");
 891 #endif
 892 #ifdef SUPPORT_TLS
 893   #ifdef USE_GNUTLS
 894   fprintf(f, " GnuTLS");
 895   #else
 896   fprintf(f, " OpenSSL");
 897   #endif
 898 #endif
 899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 900   fprintf(f, " translate_ip_address");
 901 #endif
 902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 903   fprintf(f, " move_frozen_messages");
 904 #endif
 905 #ifdef WITH_CONTENT_SCAN
 906   fprintf(f, " Content_Scanning");
 907 #endif
 908 #ifdef WITH_OLD_DEMIME
 909   fprintf(f, " Old_Demime");
 910 #endif
 911 #ifdef EXPERIMENTAL_SPF
 912   fprintf(f, " Experimental_SPF");
 913 #endif
 914 #ifdef EXPERIMENTAL_SRS
 915   fprintf(f, " Experimental_SRS");
 916 #endif
 917 #ifdef EXPERIMENTAL_BRIGHTMAIL
 918   fprintf(f, " Experimental_Brightmail");
 919 #endif
 920 #ifdef EXPERIMENTAL_DOMAINKEYS
 921   fprintf(f, " Experimental_DomainKeys");
 922 #endif
 923 #ifdef EXPERIMENTAL_DKIM
 924   fprintf(f, " Experimental_DKIM");
 925 #endif
 926 #ifdef EXPERIMENTAL_DCC
 927   fprintf(f, " Experimental_DCC");
 928 #endif
 929 fprintf(f, "\n");
 930
 931 fprintf(f, "Lookups:");
 932 #ifdef LOOKUP_LSEARCH
 933   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 934 #endif
 935 #ifdef LOOKUP_CDB
 936   fprintf(f, " cdb");
 937 #endif
 938 #ifdef LOOKUP_DBM
 939   fprintf(f, " dbm dbmnz");
 940 #endif
 941 #ifdef LOOKUP_DNSDB
 942   fprintf(f, " dnsdb");
 943 #endif
 944 #ifdef LOOKUP_DSEARCH
 945   fprintf(f, " dsearch");
 946 #endif
 947 #ifdef LOOKUP_IBASE
 948   fprintf(f, " ibase");
 949 #endif
 950 #ifdef LOOKUP_LDAP
 951   fprintf(f, " ldap ldapdn ldapm");
 952 #endif
 953 #ifdef LOOKUP_MYSQL
 954   fprintf(f, " mysql");
 955 #endif
 956 #ifdef LOOKUP_NIS
 957   fprintf(f, " nis nis0");
 958 #endif
 959 #ifdef LOOKUP_NISPLUS
 960   fprintf(f, " nisplus");
 961 #endif
 962 #ifdef LOOKUP_ORACLE
 963   fprintf(f, " oracle");
 964 #endif
 965 #ifdef LOOKUP_PASSWD
 966   fprintf(f, " passwd");
 967 #endif
 968 #ifdef LOOKUP_PGSQL
 969   fprintf(f, " pgsql");
 970 #endif
 971 #ifdef LOOKUP_SQLITE
 972   fprintf(f, " sqlite");
 973 #endif
 974 #ifdef LOOKUP_TESTDB
 975   fprintf(f, " testdb");
 976 #endif
 977 #ifdef LOOKUP_WHOSON
 978   fprintf(f, " whoson");
 979 #endif
 980 fprintf(f, "\n");
 981
 982 fprintf(f, "Authenticators:");
 983 #ifdef AUTH_CRAM_MD5
 984   fprintf(f, " cram_md5");
 985 #endif
 986 #ifdef AUTH_CYRUS_SASL
 987   fprintf(f, " cyrus_sasl");
 988 #endif
 989 #ifdef AUTH_DOVECOT
 990   fprintf(f, " dovecot");
 991 #endif
 992 #ifdef AUTH_PLAINTEXT
 993   fprintf(f, " plaintext");
 994 #endif
 995 #ifdef AUTH_SPA
 996   fprintf(f, " spa");
 997 #endif
 998 fprintf(f, "\n");
 999
1000 fprintf(f, "Routers:");
1001 #ifdef ROUTER_ACCEPT
1002   fprintf(f, " accept");
1003 #endif
1004 #ifdef ROUTER_DNSLOOKUP
1005   fprintf(f, " dnslookup");
1006 #endif
1007 #ifdef ROUTER_IPLITERAL
1008   fprintf(f, " ipliteral");
1009 #endif
1010 #ifdef ROUTER_IPLOOKUP
1011   fprintf(f, " iplookup");
1012 #endif
1013 #ifdef ROUTER_MANUALROUTE
1014   fprintf(f, " manualroute");
1015 #endif
1016 #ifdef ROUTER_QUERYPROGRAM
1017   fprintf(f, " queryprogram");
1018 #endif
1019 #ifdef ROUTER_REDIRECT
1020   fprintf(f, " redirect");
1021 #endif
1022 fprintf(f, "\n");
1023
1024 fprintf(f, "Transports:");
1025 #ifdef TRANSPORT_APPENDFILE
1026   fprintf(f, " appendfile");
1027   #ifdef SUPPORT_MAILDIR
1028     fprintf(f, "/maildir");
1029   #endif
1030   #ifdef SUPPORT_MAILSTORE
1031     fprintf(f, "/mailstore");
1032   #endif
1033   #ifdef SUPPORT_MBX
1034     fprintf(f, "/mbx");
1035   #endif
1036 #endif
1037 #ifdef TRANSPORT_AUTOREPLY
1038   fprintf(f, " autoreply");
1039 #endif
1040 #ifdef TRANSPORT_LMTP
1041   fprintf(f, " lmtp");
1042 #endif
1043 #ifdef TRANSPORT_PIPE
1044   fprintf(f, " pipe");
1045 #endif
1046 #ifdef TRANSPORT_SMTP
1047   fprintf(f, " smtp");
1048 #endif
1049 fprintf(f, "\n");
1050
1051 if (fixed_never_users[0] > 0)
1052   {
1053   int i;
1054   fprintf(f, "Fixed never_users: ");
1055   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1056     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1057   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1058   }
1059
1060 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1061 }
1062
1063
1064
1065
1066 /*************************************************
1067 *               Quote a local part               *
1068 *************************************************/
1069
1070 /* This function is used when a sender address or a From: or Sender: header
1071 line is being created from the caller's login, or from an authenticated_id. It
1072 applies appropriate quoting rules for a local part.
1073
1074 Argument:    the local part
1075 Returns:     the local part, quoted if necessary
1076 */
1077
1078 uschar *
1079 local_part_quote(uschar *lpart)
1080 {
1081 BOOL needs_quote = FALSE;
1082 int size, ptr;
1083 uschar *yield;
1084 uschar *t;
1085
1086 for (t = lpart; !needs_quote && *t != 0; t++)
1087   {
1088   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1089     (*t != '.' || t == lpart || t[1] == 0);
1090   }
1091
1092 if (!needs_quote) return lpart;
1093
1094 size = ptr = 0;
1095 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1096
1097 for (;;)
1098   {
1099   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1100   if (nq == NULL)
1101     {
1102     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1103     break;
1104     }
1105   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1106   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1107   yield = string_cat(yield, &size, &ptr, nq, 1);
1108   lpart = nq + 1;
1109   }
1110
1111 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1112 yield[ptr] = 0;
1113 return yield;
1114 }
1115
1116
1117
1118 #ifdef USE_READLINE
1119 /*************************************************
1120 *         Load readline() functions              *
1121 *************************************************/
1122
1123 /* This function is called from testing executions that read data from stdin,
1124 but only when running as the calling user. Currently, only -be does this. The
1125 function loads the readline() function library and passes back the functions.
1126 On some systems, it needs the curses library, so load that too, but try without
1127 it if loading fails. All this functionality has to be requested at build time.
1128
1129 Arguments:
1130   fn_readline_ptr   pointer to where to put the readline pointer
1131   fn_addhist_ptr    pointer to where to put the addhistory function
1132
1133 Returns:            the dlopen handle or NULL on failure
1134 */
1135
1136 static void *
1137 set_readline(char * (**fn_readline_ptr)(char *),
1138              char * (**fn_addhist_ptr)(char *))
1139 {
1140 void *dlhandle;
1141 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1142
1143 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1144 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1145
1146 if (dlhandle != NULL)
1147   {
1148   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1149   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1150   }
1151 else
1152   {
1153   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1154   }
1155
1156 return dlhandle;
1157 }
1158 #endif
1159
1160
1161
1162 /*************************************************
1163 *    Get a line from stdin for testing things    *
1164 *************************************************/
1165
1166 /* This function is called when running tests that can take a number of lines
1167 of input (for example, -be and -bt). It handles continuations and trailing
1168 spaces. And prompting and a blank line output on eof. If readline() is in use,
1169 the arguments are non-NULL and provide the relevant functions.
1170
1171 Arguments:
1172   fn_readline   readline function or NULL
1173   fn_addhist    addhist function or NULL
1174
1175 Returns:        pointer to dynamic memory, or NULL at end of file
1176 */
1177
1178 static uschar *
1179 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1180 {
1181 int i;
1182 int size = 0;
1183 int ptr = 0;
1184 uschar *yield = NULL;
1185
1186 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1187
1188 for (i = 0;; i++)
1189   {
1190   uschar buffer[1024];
1191   uschar *p, *ss;
1192
1193   #ifdef USE_READLINE
1194   char *readline_line = NULL;
1195   if (fn_readline != NULL)
1196     {
1197     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1198     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1199     p = US readline_line;
1200     }
1201   else
1202   #endif
1203
1204   /* readline() not in use */
1205
1206     {
1207     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1208     p = buffer;
1209     }
1210
1211   /* Handle the line */
1212
1213   ss = p + (int)Ustrlen(p);
1214   while (ss > p && isspace(ss[-1])) ss--;
1215
1216   if (i > 0)
1217     {
1218     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1219     }
1220
1221   yield = string_cat(yield, &size, &ptr, p, ss - p);
1222
1223   #ifdef USE_READLINE
1224   if (fn_readline != NULL) free(readline_line);
1225   #endif
1226
1227   if (ss == p || yield[ptr-1] != '\\')
1228     {
1229     yield[ptr] = 0;
1230     break;
1231     }
1232   yield[--ptr] = 0;
1233   }
1234
1235 if (yield == NULL) printf("\n");
1236 return yield;
1237 }
1238
1239
1240
1241 /*************************************************
1242 *    Output usage information for the program    *
1243 *************************************************/
1244
1245 /* This function is called when there are no recipients
1246    or a specific --help argument was added.
1247
1248 Arguments:
1249   progname      information on what name we were called by
1250
1251 Returns:        DOES NOT RETURN
1252 */
1253
1254 static void
1255 exim_usage(uschar *progname)
1256 {
1257
1258 /* Handle specific program invocation varients */
1259 if (Ustrcmp(progname, US"-mailq") == 0)
1260   {
1261   fprintf(stderr,
1262     "mailq - list the contents of the mail queue\n\n",
1263     "For a list of options, see the Exim documentation.\n");
1264   exit(EXIT_FAILURE);
1265   }
1266
1267 /* Generic usage - we output this whatever happens */
1268 fprintf(stderr,
1269   "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1270   "not directly from a shell command line. Options and/or arguments control\n"
1271   "what it does when called. For a list of options, see the Exim documentation.\n");
1272
1273 exit(EXIT_FAILURE);
1274 }
1275
1276
1277
1278 /*************************************************
1279 *          Entry point and high-level code       *
1280 *************************************************/
1281
1282 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1283 the appropriate action. All the necessary functions are present in the one
1284 binary. I originally thought one should split it up, but it turns out that so
1285 much of the apparatus is needed in each chunk that one might as well just have
1286 it all available all the time, which then makes the coding easier as well.
1287
1288 Arguments:
1289   argc      count of entries in argv
1290   argv      argument strings, with argv[0] being the program name
1291
1292 Returns:    EXIT_SUCCESS if terminated successfully
1293             EXIT_FAILURE otherwise, except when a message has been sent
1294               to the sender, and -oee was given
1295 */
1296
1297 int
1298 main(int argc, char **cargv)
1299 {
1300 uschar **argv = USS cargv;
1301 int  arg_receive_timeout = -1;
1302 int  arg_smtp_receive_timeout = -1;
1303 int  arg_error_handling = error_handling;
1304 int  filter_sfd = -1;
1305 int  filter_ufd = -1;
1306 int  group_count;
1307 int  i;
1308 int  list_queue_option = 0;
1309 int  msg_action = 0;
1310 int  msg_action_arg = -1;
1311 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1312 int  queue_only_reason = 0;
1313 #ifdef EXIM_PERL
1314 int  perl_start_option = 0;
1315 #endif
1316 int  recipients_arg = argc;
1317 int  sender_address_domain = 0;
1318 int  test_retry_arg = -1;
1319 int  test_rewrite_arg = -1;
1320 BOOL arg_queue_only = FALSE;
1321 BOOL bi_option = FALSE;
1322 BOOL checking = FALSE;
1323 BOOL count_queue = FALSE;
1324 BOOL expansion_test = FALSE;
1325 BOOL extract_recipients = FALSE;
1326 BOOL forced_delivery = FALSE;
1327 BOOL f_end_dot = FALSE;
1328 BOOL deliver_give_up = FALSE;
1329 BOOL list_queue = FALSE;
1330 BOOL list_options = FALSE;
1331 BOOL local_queue_only;
1332 BOOL more = TRUE;
1333 BOOL one_msg_action = FALSE;
1334 BOOL queue_only_set = FALSE;
1335 BOOL receiving_message = TRUE;
1336 BOOL sender_ident_set = FALSE;
1337 BOOL session_local_queue_only;
1338 BOOL unprivileged;
1339 BOOL removed_privilege = FALSE;
1340 BOOL usage_wanted = FALSE;
1341 BOOL verify_address_mode = FALSE;
1342 BOOL verify_as_sender = FALSE;
1343 BOOL version_printed = FALSE;
1344 uschar *alias_arg = NULL;
1345 uschar *called_as = US"";
1346 uschar *start_queue_run_id = NULL;
1347 uschar *stop_queue_run_id = NULL;
1348 uschar *expansion_test_message = NULL;
1349 uschar *ftest_domain = NULL;
1350 uschar *ftest_localpart = NULL;
1351 uschar *ftest_prefix = NULL;
1352 uschar *ftest_suffix = NULL;
1353 uschar *real_sender_address;
1354 uschar *originator_home = US"/";
1355 void *reset_point;
1356
1357 struct passwd *pw;
1358 struct stat statbuf;
1359 pid_t passed_qr_pid = (pid_t)0;
1360 int passed_qr_pipe = -1;
1361 gid_t group_list[NGROUPS_MAX];
1362
1363 /* Possible options for -R and -S */
1364
1365 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1366
1367 /* Need to define this in case we need to change the environment in order
1368 to get rid of a bogus time zone. We have to make it char rather than uschar
1369 because some OS define it in /usr/include/unistd.h. */
1370
1371 extern char **environ;
1372
1373 /* If the Exim user and/or group and/or the configuration file owner/group were
1374 defined by ref:name at build time, we must now find the actual uid/gid values.
1375 This is a feature to make the lives of binary distributors easier. */
1376
1377 #ifdef EXIM_USERNAME
1378 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1379   {
1380   exim_gid = pw->pw_gid;
1381   }
1382 else
1383   {
1384   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1385     EXIM_USERNAME);
1386   exit(EXIT_FAILURE);
1387   }
1388 #endif
1389
1390 #ifdef EXIM_GROUPNAME
1391 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1392   {
1393   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1394     EXIM_GROUPNAME);
1395   exit(EXIT_FAILURE);
1396   }
1397 #endif
1398
1399 #ifdef CONFIGURE_OWNERNAME
1400 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1401   {
1402   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1403     CONFIGURE_OWNERNAME);
1404   exit(EXIT_FAILURE);
1405   }
1406 #endif
1407
1408 #ifdef CONFIGURE_GROUPNAME
1409 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1410   {
1411   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1412     CONFIGURE_GROUPNAME);
1413   exit(EXIT_FAILURE);
1414   }
1415 #endif
1416
1417 /* In the Cygwin environment, some initialization needs doing. It is fudged
1418 in by means of this macro. */
1419
1420 #ifdef OS_INIT
1421 OS_INIT
1422 #endif
1423
1424 /* Check a field which is patched when we are running Exim within its
1425 testing harness; do a fast initial check, and then the whole thing. */
1426
1427 running_in_test_harness =
1428   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1429
1430 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1431 at the start of a program; however, it seems that some environments do not
1432 follow this. A "strange" locale can affect the formatting of timestamps, so we
1433 make quite sure. */
1434
1435 setlocale(LC_ALL, "C");
1436
1437 /* Set up the default handler for timing using alarm(). */
1438
1439 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1440
1441 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1442 because store_malloc writes a log entry on failure. */
1443
1444 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1445 if (log_buffer == NULL)
1446   {
1447   fprintf(stderr, "exim: failed to get store for log buffer\n");
1448   exit(EXIT_FAILURE);
1449   }
1450
1451 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1452 NULL when the daemon is run and the file is closed. We have to use this
1453 indirection, because some systems don't allow writing to the variable "stderr".
1454 */
1455
1456 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1457
1458 /* Arrange for the PCRE regex library to use our store functions. Note that
1459 the normal calls are actually macros that add additional arguments for
1460 debugging purposes so we have to assign specially constructed functions here.
1461 The default is to use store in the stacking pool, but this is overridden in the
1462 regex_must_compile() function. */
1463
1464 pcre_malloc = function_store_get;
1465 pcre_free = function_dummy_free;
1466
1467 /* Ensure there is a big buffer for temporary use in several places. It is put
1468 in malloc store so that it can be freed for enlargement if necessary. */
1469
1470 big_buffer = store_malloc(big_buffer_size);
1471
1472 /* Set up the handler for the data request signal, and set the initial
1473 descriptive text. */
1474
1475 set_process_info("initializing");
1476 os_restarting_signal(SIGUSR1, usr1_handler);
1477
1478 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1479 in the daemon code. For the rest of Exim's uses, we ignore it. */
1480
1481 signal(SIGHUP, SIG_IGN);
1482
1483 /* We don't want to die on pipe errors as the code is written to handle
1484 the write error instead. */
1485
1486 signal(SIGPIPE, SIG_IGN);
1487
1488 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1489 set to SIG_IGN. This causes subprocesses that complete before the parent
1490 process waits for them not to hang around, so when Exim calls wait(), nothing
1491 is there. The wait() code has been made robust against this, but let's ensure
1492 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1493 ending status. We use sigaction rather than plain signal() on those OS where
1494 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1495 problem on AIX with this.) */
1496
1497 #ifdef SA_NOCLDWAIT
1498   {
1499   struct sigaction act;
1500   act.sa_handler = SIG_DFL;
1501   sigemptyset(&(act.sa_mask));
1502   act.sa_flags = 0;
1503   sigaction(SIGCHLD, &act, NULL);
1504   }
1505 #else
1506 signal(SIGCHLD, SIG_DFL);
1507 #endif
1508
1509 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1510 SIGHUP. */
1511
1512 sighup_argv = argv;
1513
1514 /* Set up the version number. Set up the leading 'E' for the external form of
1515 message ids, set the pointer to the internal form, and initialize it to
1516 indicate no message being processed. */
1517
1518 version_init();
1519 message_id_option[0] = '-';
1520 message_id_external = message_id_option + 1;
1521 message_id_external[0] = 'E';
1522 message_id = message_id_external + 1;
1523 message_id[0] = 0;
1524
1525 /* Set the umask to zero so that any files Exim creates using open() are
1526 created with the modes that it specifies. NOTE: Files created with fopen() have
1527 a problem, which was not recognized till rather late (February 2006). With this
1528 umask, such files will be world writeable. (They are all content scanning files
1529 in the spool directory, which isn't world-accessible, so this is not a
1530 disaster, but it's untidy.) I don't want to change this overall setting,
1531 however, because it will interact badly with the open() calls. Instead, there's
1532 now a function called modefopen() that fiddles with the umask while calling
1533 fopen(). */
1534
1535 (void)umask(0);
1536
1537 /* Precompile the regular expression for matching a message id. Keep this in
1538 step with the code that generates ids in the accept.c module. We need to do
1539 this here, because the -M options check their arguments for syntactic validity
1540 using mac_ismsgid, which uses this. */
1541
1542 regex_ismsgid =
1543   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1544
1545 /* Precompile the regular expression that is used for matching an SMTP error
1546 code, possibly extended, at the start of an error message. Note that the
1547 terminating whitespace character is included. */
1548
1549 regex_smtp_code =
1550   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1551     FALSE, TRUE);
1552
1553 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1554 this seems to be a generally accepted convention, since one finds symbolic
1555 links called "mailq" in standard OS configurations. */
1556
1557 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1558     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1559   {
1560   list_queue = TRUE;
1561   receiving_message = FALSE;
1562   called_as = US"-mailq";
1563   }
1564
1565 /* If the program is called as "rmail" treat it as equivalent to
1566 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1567 i.e. preventing a single dot on a line from terminating the message, and
1568 returning with zero return code, even in cases of error (provided an error
1569 message has been sent). */
1570
1571 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1572     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1573   {
1574   dot_ends = FALSE;
1575   called_as = US"-rmail";
1576   errors_sender_rc = EXIT_SUCCESS;
1577   }
1578
1579 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1580 this is a smail convention. */
1581
1582 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1583     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1584   {
1585   smtp_input = smtp_batched_input = TRUE;
1586   called_as = US"-rsmtp";
1587   }
1588
1589 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1590 this is a smail convention. */
1591
1592 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1593     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1594   {
1595   queue_interval = 0;
1596   receiving_message = FALSE;
1597   called_as = US"-runq";
1598   }
1599
1600 /* If the program is called as "newaliases" treat it as equivalent to
1601 "exim -bi"; this is a sendmail convention. */
1602
1603 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1604     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1605   {
1606   bi_option = TRUE;
1607   receiving_message = FALSE;
1608   called_as = US"-newaliases";
1609   }
1610
1611 /* Save the original effective uid for a couple of uses later. It should
1612 normally be root, but in some esoteric environments it may not be. */
1613
1614 original_euid = geteuid();
1615
1616 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1617 to be the same as the real ones. This makes a difference only if Exim is setuid
1618 (or setgid) to something other than root, which could be the case in some
1619 special configurations. */
1620
1621 real_uid = getuid();
1622 real_gid = getgid();
1623
1624 if (real_uid == root_uid)
1625   {
1626   setgid(real_gid);
1627   setuid(real_uid);
1628   }
1629
1630 /* If neither the original real uid nor the original euid was root, Exim is
1631 running in an unprivileged state. */
1632
1633 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1634
1635 /* If the first argument is --help, set usage_wanted and pretend there
1636 are no arguments. This will cause a brief message to be given.   We do
1637 the message generation downstream so we can pick up how we were invoked */
1638
1639 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0)
1640   {
1641   argc = 1;
1642   usage_wanted = TRUE;
1643   }
1644
1645 /* Scan the program's arguments. Some can be dealt with right away; others are
1646 simply recorded for checking and handling afterwards. Do a high-level switch
1647 on the second character (the one after '-'), to save some effort. */
1648
1649 for (i = 1; i < argc; i++)
1650   {
1651   BOOL badarg = FALSE;
1652   uschar *arg = argv[i];
1653   uschar *argrest;
1654   int switchchar;
1655
1656   /* An argument not starting with '-' is the start of a recipients list;
1657   break out of the options-scanning loop. */
1658
1659   if (arg[0] != '-')
1660     {
1661     recipients_arg = i;
1662     break;
1663     }
1664
1665   /* An option consistion of -- terminates the options */
1666
1667   if (Ustrcmp(arg, "--") == 0)
1668     {
1669     recipients_arg = i + 1;
1670     break;
1671     }
1672
1673   /* Handle flagged options */
1674
1675   switchchar = arg[1];
1676   argrest = arg+2;
1677
1678   /* Make all -ex options synonymous with -oex arguments, since that
1679   is assumed by various callers. Also make -qR options synonymous with -R
1680   options, as that seems to be required as well. Allow for -qqR too, and
1681   the same for -S options. */
1682
1683   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1684       Ustrncmp(arg+1, "qR", 2) == 0 ||
1685       Ustrncmp(arg+1, "qS", 2) == 0)
1686     {
1687     switchchar = arg[2];
1688     argrest++;
1689     }
1690   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1691     {
1692     switchchar = arg[3];
1693     argrest += 2;
1694     queue_2stage = TRUE;
1695     }
1696
1697   /* Make -r synonymous with -f, since it is a documented alias */
1698
1699   else if (arg[1] == 'r') switchchar = 'f';
1700
1701   /* Make -ov synonymous with -v */
1702
1703   else if (Ustrcmp(arg, "-ov") == 0)
1704     {
1705     switchchar = 'v';
1706     argrest++;
1707     }
1708
1709   /* High-level switch on active initial letter */
1710
1711   switch(switchchar)
1712     {
1713     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1714     so has no need of it. */
1715
1716     case 'B':
1717     if (*argrest == 0) i++;       /* Skip over the type */
1718     break;
1719
1720
1721     case 'b':
1722     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1723
1724     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1725        -bdf: Ditto, but in the foreground.
1726     */
1727
1728     if (*argrest == 'd')
1729       {
1730       daemon_listen = TRUE;
1731       if (*(++argrest) == 'f') background_daemon = FALSE;
1732         else if (*argrest != 0) { badarg = TRUE; break; }
1733       }
1734
1735     /* -be:  Run in expansion test mode
1736        -bem: Ditto, but read a message from a file first
1737     */
1738
1739     else if (*argrest == 'e')
1740       {
1741       expansion_test = checking = TRUE;
1742       if (argrest[1] == 'm')
1743         {
1744         if (++i >= argc) { badarg = TRUE; break; }
1745         expansion_test_message = argv[i];
1746         argrest++;
1747         }
1748       if (argrest[1] != 0) { badarg = TRUE; break; }
1749       }
1750
1751     /* -bF:  Run system filter test */
1752
1753     else if (*argrest == 'F')
1754       {
1755       filter_test |= FTEST_SYSTEM;
1756       if (*(++argrest) != 0) { badarg = TRUE; break; }
1757       if (++i < argc) filter_test_sfile = argv[i]; else
1758         {
1759         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1760         exit(EXIT_FAILURE);
1761         }
1762       }
1763
1764     /* -bf:  Run user filter test
1765        -bfd: Set domain for filter testing
1766        -bfl: Set local part for filter testing
1767        -bfp: Set prefix for filter testing
1768        -bfs: Set suffix for filter testing
1769     */
1770
1771     else if (*argrest == 'f')
1772       {
1773       if (*(++argrest) == 0)
1774         {
1775         filter_test |= FTEST_USER;
1776         if (++i < argc) filter_test_ufile = argv[i]; else
1777           {
1778           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1779           exit(EXIT_FAILURE);
1780           }
1781         }
1782       else
1783         {
1784         if (++i >= argc)
1785           {
1786           fprintf(stderr, "exim: string expected after %s\n", arg);
1787           exit(EXIT_FAILURE);
1788           }
1789         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1790         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1791         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1792         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1793         else { badarg = TRUE; break; }
1794         }
1795       }
1796
1797     /* -bh: Host checking - an IP address must follow. */
1798
1799     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1800       {
1801       if (++i >= argc) { badarg = TRUE; break; }
1802       sender_host_address = argv[i];
1803       host_checking = checking = log_testing_mode = TRUE;
1804       host_checking_callout = argrest[1] == 'c';
1805       }
1806
1807     /* -bi: This option is used by sendmail to initialize *the* alias file,
1808     though it has the -oA option to specify a different file. Exim has no
1809     concept of *the* alias file, but since Sun's YP make script calls
1810     sendmail this way, some support must be provided. */
1811
1812     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1813
1814     /* -bm: Accept and deliver message - the default option. Reinstate
1815     receiving_message, which got turned off for all -b options. */
1816
1817     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1818
1819     /* -bnq: For locally originating messages, do not qualify unqualified
1820     addresses. In the envelope, this causes errors; in header lines they
1821     just get left. */
1822
1823     else if (Ustrcmp(argrest, "nq") == 0)
1824       {
1825       allow_unqualified_sender = FALSE;
1826       allow_unqualified_recipient = FALSE;
1827       }
1828
1829     /* -bpxx: List the contents of the mail queue, in various forms. If
1830     the option is -bpc, just a queue count is needed. Otherwise, if the
1831     first letter after p is r, then order is random. */
1832
1833     else if (*argrest == 'p')
1834       {
1835       if (*(++argrest) == 'c')
1836         {
1837         count_queue = TRUE;
1838         if (*(++argrest) != 0) badarg = TRUE;
1839         break;
1840         }
1841
1842       if (*argrest == 'r')
1843         {
1844         list_queue_option = 8;
1845         argrest++;
1846         }
1847       else list_queue_option = 0;
1848
1849       list_queue = TRUE;
1850
1851       /* -bp: List the contents of the mail queue, top-level only */
1852
1853       if (*argrest == 0) {}
1854
1855       /* -bpu: List the contents of the mail queue, top-level undelivered */
1856
1857       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1858
1859       /* -bpa: List the contents of the mail queue, including all delivered */
1860
1861       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1862
1863       /* Unknown after -bp[r] */
1864
1865       else
1866         {
1867         badarg = TRUE;
1868         break;
1869         }
1870       }
1871
1872
1873     /* -bP: List the configuration variables given as the address list.
1874     Force -v, so configuration errors get displayed. */
1875
1876     else if (Ustrcmp(argrest, "P") == 0)
1877       {
1878       list_options = TRUE;
1879       debug_selector |= D_v;
1880       debug_file = stderr;
1881       }
1882
1883     /* -brt: Test retry configuration lookup */
1884
1885     else if (Ustrcmp(argrest, "rt") == 0)
1886       {
1887       test_retry_arg = i + 1;
1888       goto END_ARG;
1889       }
1890
1891     /* -brw: Test rewrite configuration */
1892
1893     else if (Ustrcmp(argrest, "rw") == 0)
1894       {
1895       test_rewrite_arg = i + 1;
1896       goto END_ARG;
1897       }
1898
1899     /* -bS: Read SMTP commands on standard input, but produce no replies -
1900     all errors are reported by sending messages. */
1901
1902     else if (Ustrcmp(argrest, "S") == 0)
1903       smtp_input = smtp_batched_input = receiving_message = TRUE;
1904
1905     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1906     on standard output. */
1907
1908     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1909
1910     /* -bt: address testing mode */
1911
1912     else if (Ustrcmp(argrest, "t") == 0)
1913       address_test_mode = checking = log_testing_mode = TRUE;
1914
1915     /* -bv: verify addresses */
1916
1917     else if (Ustrcmp(argrest, "v") == 0)
1918       verify_address_mode = checking = log_testing_mode = TRUE;
1919
1920     /* -bvs: verify sender addresses */
1921
1922     else if (Ustrcmp(argrest, "vs") == 0)
1923       {
1924       verify_address_mode = checking = log_testing_mode = TRUE;
1925       verify_as_sender = TRUE;
1926       }
1927
1928     /* -bV: Print version string and support details */
1929
1930     else if (Ustrcmp(argrest, "V") == 0)
1931       {
1932       printf("Exim version %s #%s built %s\n", version_string,
1933         version_cnumber, version_date);
1934       printf("%s\n", CS version_copyright);
1935       version_printed = TRUE;
1936       show_whats_supported(stdout);
1937       }
1938
1939     else badarg = TRUE;
1940     break;
1941
1942
1943     /* -C: change configuration file list; ignore if it isn't really
1944     a change! Enforce a prefix check if required. */
1945
1946     case 'C':
1947     if (*argrest == 0)
1948       {
1949       if(++i < argc) argrest = argv[i]; else
1950         { badarg = TRUE; break; }
1951       }
1952     if (Ustrcmp(config_main_filelist, argrest) != 0)
1953       {
1954       #ifdef ALT_CONFIG_PREFIX
1955       int sep = 0;
1956       int len = Ustrlen(ALT_CONFIG_PREFIX);
1957       uschar *list = argrest;
1958       uschar *filename;
1959       while((filename = string_nextinlist(&list, &sep, big_buffer,
1960              big_buffer_size)) != NULL)
1961         {
1962         if ((Ustrlen(filename) < len ||
1963              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1964              Ustrstr(filename, "/../") != NULL) &&
1965              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1966           {
1967           fprintf(stderr, "-C Permission denied\n");
1968           exit(EXIT_FAILURE);
1969           }
1970         }
1971       #endif
1972
1973       config_main_filelist = argrest;
1974       config_changed = TRUE;
1975       }
1976     break;
1977
1978
1979     /* -D: set up a macro definition */
1980
1981     case 'D':
1982     #ifdef DISABLE_D_OPTION
1983     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1984     exit(EXIT_FAILURE);
1985     #else
1986       {
1987       int ptr = 0;
1988       macro_item *mlast = NULL;
1989       macro_item *m;
1990       uschar name[24];
1991       uschar *s = argrest;
1992
1993       while (isspace(*s)) s++;
1994
1995       if (*s < 'A' || *s > 'Z')
1996         {
1997         fprintf(stderr, "exim: macro name set by -D must start with "
1998           "an upper case letter\n");
1999         exit(EXIT_FAILURE);
2000         }
2001
2002       while (isalnum(*s) || *s == '_')
2003         {
2004         if (ptr < sizeof(name)-1) name[ptr++] = *s;
2005         s++;
2006         }
2007       name[ptr] = 0;
2008       if (ptr == 0) { badarg = TRUE; break; }
2009       while (isspace(*s)) s++;
2010       if (*s != 0)
2011         {
2012         if (*s++ != '=') { badarg = TRUE; break; }
2013         while (isspace(*s)) s++;
2014         }
2015
2016       for (m = macros; m != NULL; m = m->next)
2017         {
2018         if (Ustrcmp(m->name, name) == 0)
2019           {
2020           fprintf(stderr, "exim: duplicated -D in command line\n");
2021           exit(EXIT_FAILURE);
2022           }
2023         mlast = m;
2024         }
2025
2026       m = store_get(sizeof(macro_item) + Ustrlen(name));
2027       m->next = NULL;
2028       m->command_line = TRUE;
2029       if (mlast == NULL) macros = m; else mlast->next = m;
2030       Ustrcpy(m->name, name);
2031       m->replacement = string_copy(s);
2032
2033       if (clmacro_count >= MAX_CLMACROS)
2034         {
2035         fprintf(stderr, "exim: too many -D options on command line\n");
2036         exit(EXIT_FAILURE);
2037         }
2038       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2039         m->replacement);
2040       }
2041     #endif
2042     break;
2043
2044     /* -d: Set debug level (see also -v below) or set the drop_cr option.
2045     The latter is now a no-op, retained for compatibility only. If -dd is used,
2046     debugging subprocesses of the daemon is disabled. */
2047
2048     case 'd':
2049     if (Ustrcmp(argrest, "ropcr") == 0)
2050       {
2051       /* drop_cr = TRUE; */
2052       }
2053
2054     /* Use an intermediate variable so that we don't set debugging while
2055     decoding the debugging bits. */
2056
2057     else
2058       {
2059       unsigned int selector = D_default;
2060       debug_selector = 0;
2061       debug_file = NULL;
2062       if (*argrest == 'd')
2063         {
2064         debug_daemon = TRUE;
2065         argrest++;
2066         }
2067       if (*argrest != 0)
2068         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2069           debug_options_count, US"debug");
2070       debug_selector = selector;
2071       }
2072     break;
2073
2074
2075     /* -E: This is a local error message. This option is not intended for
2076     external use at all, but is not restricted to trusted callers because it
2077     does no harm (just suppresses certain error messages) and if Exim is run
2078     not setuid root it won't always be trusted when it generates error
2079     messages using this option. If there is a message id following -E, point
2080     message_reference at it, for logging. */
2081
2082     case 'E':
2083     local_error_message = TRUE;
2084     if (mac_ismsgid(argrest)) message_reference = argrest;
2085     break;
2086
2087
2088     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2089     option, so it looks as if historically the -oex options are also callable
2090     without the leading -o. So we have to accept them. Before the switch,
2091     anything starting -oe has been converted to -e. Exim does not support all
2092     of the sendmail error options. */
2093
2094     case 'e':
2095     if (Ustrcmp(argrest, "e") == 0)
2096       {
2097       arg_error_handling = ERRORS_SENDER;
2098       errors_sender_rc = EXIT_SUCCESS;
2099       }
2100     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2101     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2102     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2103     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2104     else badarg = TRUE;
2105     break;
2106
2107
2108     /* -F: Set sender's full name, used instead of the gecos entry from
2109     the password file. Since users can usually alter their gecos entries,
2110     there's no security involved in using this instead. The data can follow
2111     the -F or be in the next argument. */
2112
2113     case 'F':
2114     if (*argrest == 0)
2115       {
2116       if(++i < argc) argrest = argv[i]; else
2117         { badarg = TRUE; break; }
2118       }
2119     originator_name = argrest;
2120     sender_name_forced = TRUE;
2121     break;
2122
2123
2124     /* -f: Set sender's address - this value is only actually used if Exim is
2125     run by a trusted user, or if untrusted_set_sender is set and matches the
2126     address, except that the null address can always be set by any user. The
2127     test for this happens later, when the value given here is ignored when not
2128     permitted. For an untrusted user, the actual sender is still put in Sender:
2129     if it doesn't match the From: header (unless no_local_from_check is set).
2130     The data can follow the -f or be in the next argument. The -r switch is an
2131     obsolete form of -f but since there appear to be programs out there that
2132     use anything that sendmail has ever supported, better accept it - the
2133     synonymizing is done before the switch above.
2134
2135     At this stage, we must allow domain literal addresses, because we don't
2136     know what the setting of allow_domain_literals is yet. Ditto for trailing
2137     dots and strip_trailing_dot. */
2138
2139     case 'f':
2140       {
2141       int start, end;
2142       uschar *errmess;
2143       if (*argrest == 0)
2144         {
2145         if (i+1 < argc) argrest = argv[++i]; else
2146           { badarg = TRUE; break; }
2147         }
2148       if (*argrest == 0)
2149         {
2150         sender_address = string_sprintf("");  /* Ensure writeable memory */
2151         }
2152       else
2153         {
2154         uschar *temp = argrest + Ustrlen(argrest) - 1;
2155         while (temp >= argrest && isspace(*temp)) temp--;
2156         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2157         allow_domain_literals = TRUE;
2158         strip_trailing_dot = TRUE;
2159         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2160           &sender_address_domain, TRUE);
2161         allow_domain_literals = FALSE;
2162         strip_trailing_dot = FALSE;
2163         if (sender_address == NULL)
2164           {
2165           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2166           return EXIT_FAILURE;
2167           }
2168         }
2169       sender_address_forced = TRUE;
2170       }
2171     break;
2172
2173     /* This is some Sendmail thing which can be ignored */
2174
2175     case 'G':
2176     break;
2177
2178     /* -h: Set the hop count for an incoming message. Exim does not currently
2179     support this; it always computes it by counting the Received: headers.
2180     To put it in will require a change to the spool header file format. */
2181
2182     case 'h':
2183     if (*argrest == 0)
2184       {
2185       if(++i < argc) argrest = argv[i]; else
2186         { badarg = TRUE; break; }
2187       }
2188     if (!isdigit(*argrest)) badarg = TRUE;
2189     break;
2190
2191
2192     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2193     not to be documented for sendmail but mailx (at least) uses it) */
2194
2195     case 'i':
2196     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2197     break;
2198
2199
2200     case 'M':
2201     receiving_message = FALSE;
2202
2203     /* -MC:  continue delivery of another message via an existing open
2204     file descriptor. This option is used for an internal call by the
2205     smtp transport when there is a pending message waiting to go to an
2206     address to which it has got a connection. Five subsequent arguments are
2207     required: transport name, host name, IP address, sequence number, and
2208     message_id. Transports may decline to create new processes if the sequence
2209     number gets too big. The channel is stdin. This (-MC) must be the last
2210     argument. There's a subsequent check that the real-uid is privileged.
2211
2212     If we are running in the test harness. delay for a bit, to let the process
2213     that set this one up complete. This makes for repeatability of the logging,
2214     etc. output. */
2215
2216     if (Ustrcmp(argrest, "C") == 0)
2217       {
2218       union sockaddr_46 interface_sock;
2219       EXIM_SOCKLEN_T size = sizeof(interface_sock);
2220
2221       if (argc != i + 6)
2222         {
2223         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2224         return EXIT_FAILURE;
2225         }
2226
2227       if (msg_action_arg >= 0)
2228         {
2229         fprintf(stderr, "exim: incompatible arguments\n");
2230         return EXIT_FAILURE;
2231         }
2232
2233       continue_transport = argv[++i];
2234       continue_hostname = argv[++i];
2235       continue_host_address = argv[++i];
2236       continue_sequence = Uatoi(argv[++i]);
2237       msg_action = MSG_DELIVER;
2238       msg_action_arg = ++i;
2239       forced_delivery = TRUE;
2240       queue_run_pid = passed_qr_pid;
2241       queue_run_pipe = passed_qr_pipe;
2242
2243       if (!mac_ismsgid(argv[i]))
2244         {
2245         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2246           argv[i]);
2247         return EXIT_FAILURE;
2248         }
2249
2250       /* Set up $sending_ip_address and $sending_port */
2251
2252       if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2253           &size) == 0)
2254         sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2255           &sending_port);
2256       else
2257         {
2258         fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2259           strerror(errno));
2260         return EXIT_FAILURE;
2261         }
2262
2263       if (running_in_test_harness) millisleep(500);
2264       break;
2265       }
2266
2267     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2268     precedes -MC (see above). The flag indicates that the host to which
2269     Exim is connected has accepted an AUTH sequence. */
2270
2271     else if (Ustrcmp(argrest, "CA") == 0)
2272       {
2273       smtp_authenticated = TRUE;
2274       break;
2275       }
2276
2277     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2278     it preceded -MC (see above) */
2279
2280     else if (Ustrcmp(argrest, "CP") == 0)
2281       {
2282       smtp_use_pipelining = TRUE;
2283       break;
2284       }
2285
2286     /* -MCQ: pass on the pid of the queue-running process that started
2287     this chain of deliveries and the fd of its synchronizing pipe; this
2288     is useful only when it precedes -MC (see above) */
2289
2290     else if (Ustrcmp(argrest, "CQ") == 0)
2291       {
2292       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2293         else badarg = TRUE;
2294       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2295         else badarg = TRUE;
2296       break;
2297       }
2298
2299     /* -MCS: set the smtp_use_size flag; this is useful only when it
2300     precedes -MC (see above) */
2301
2302     else if (Ustrcmp(argrest, "CS") == 0)
2303       {
2304       smtp_use_size = TRUE;
2305       break;
2306       }
2307
2308     /* -MCT: set the tls_offered flag; this is useful only when it
2309     precedes -MC (see above). The flag indicates that the host to which
2310     Exim is connected has offered TLS support. */
2311
2312     #ifdef SUPPORT_TLS
2313     else if (Ustrcmp(argrest, "CT") == 0)
2314       {
2315       tls_offered = TRUE;
2316       break;
2317       }
2318     #endif
2319
2320     /* -M[x]: various operations on the following list of message ids:
2321        -M    deliver the messages, ignoring next retry times and thawing
2322        -Mc   deliver the messages, checking next retry times, no thawing
2323        -Mf   freeze the messages
2324        -Mg   give up on the messages
2325        -Mt   thaw the messages
2326        -Mrm  remove the messages
2327     In the above cases, this must be the last option. There are also the
2328     following options which are followed by a single message id, and which
2329     act on that message. Some of them use the "recipient" addresses as well.
2330        -Mar  add recipient(s)
2331        -Mmad mark all recipients delivered
2332        -Mmd  mark recipients(s) delivered
2333        -Mes  edit sender
2334        -Mset load a message for use with -be
2335        -Mvb  show body
2336        -Mvc  show copy (of whole message, in RFC 2822 format)
2337        -Mvh  show header
2338        -Mvl  show log
2339     */
2340
2341     else if (*argrest == 0)
2342       {
2343       msg_action = MSG_DELIVER;
2344       forced_delivery = deliver_force_thaw = TRUE;
2345       }
2346     else if (Ustrcmp(argrest, "ar") == 0)
2347       {
2348       msg_action = MSG_ADD_RECIPIENT;
2349       one_msg_action = TRUE;
2350       }
2351     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2352     else if (Ustrcmp(argrest, "es") == 0)
2353       {
2354       msg_action = MSG_EDIT_SENDER;
2355       one_msg_action = TRUE;
2356       }
2357     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2358     else if (Ustrcmp(argrest, "g") == 0)
2359       {
2360       msg_action = MSG_DELIVER;
2361       deliver_give_up = TRUE;
2362       }
2363     else if (Ustrcmp(argrest, "mad") == 0)
2364       {
2365       msg_action = MSG_MARK_ALL_DELIVERED;
2366       }
2367     else if (Ustrcmp(argrest, "md") == 0)
2368       {
2369       msg_action = MSG_MARK_DELIVERED;
2370       one_msg_action = TRUE;
2371       }
2372     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2373     else if (Ustrcmp(argrest, "set") == 0)
2374       {
2375       msg_action = MSG_LOAD;
2376       one_msg_action = TRUE;
2377       }
2378     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2379     else if (Ustrcmp(argrest, "vb") == 0)
2380       {
2381       msg_action = MSG_SHOW_BODY;
2382       one_msg_action = TRUE;
2383       }
2384     else if (Ustrcmp(argrest, "vc") == 0)
2385       {
2386       msg_action = MSG_SHOW_COPY;
2387       one_msg_action = TRUE;
2388       }
2389     else if (Ustrcmp(argrest, "vh") == 0)
2390       {
2391       msg_action = MSG_SHOW_HEADER;
2392       one_msg_action = TRUE;
2393       }
2394     else if (Ustrcmp(argrest, "vl") == 0)
2395       {
2396       msg_action = MSG_SHOW_LOG;
2397       one_msg_action = TRUE;
2398       }
2399     else { badarg = TRUE; break; }
2400
2401     /* All the -Mxx options require at least one message id. */
2402
2403     msg_action_arg = i + 1;
2404     if (msg_action_arg >= argc)
2405       {
2406       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2407       return EXIT_FAILURE;
2408       }
2409
2410     /* Some require only message ids to follow */
2411
2412     if (!one_msg_action)
2413       {
2414       int j;
2415       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2416         {
2417         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2418           argv[j], arg);
2419         return EXIT_FAILURE;
2420         }
2421       goto END_ARG;   /* Remaining args are ids */
2422       }
2423
2424     /* Others require only one message id, possibly followed by addresses,
2425     which will be handled as normal arguments. */
2426
2427     else
2428       {
2429       if (!mac_ismsgid(argv[msg_action_arg]))
2430         {
2431         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2432           argv[msg_action_arg], arg);
2433         return EXIT_FAILURE;
2434         }
2435       i++;
2436       }
2437     break;
2438
2439
2440     /* Some programs seem to call the -om option without the leading o;
2441     for sendmail it askes for "me too". Exim always does this. */
2442
2443     case 'm':
2444     if (*argrest != 0) badarg = TRUE;
2445     break;
2446
2447
2448     /* -N: don't do delivery - a debugging option that stops transports doing
2449     their thing. It implies debugging at the D_v level. */
2450
2451     case 'N':
2452     if (*argrest == 0)
2453       {
2454       dont_deliver = TRUE;
2455       debug_selector |= D_v;
2456       debug_file = stderr;
2457       }
2458     else badarg = TRUE;
2459     break;
2460
2461
2462     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2463     it. */
2464
2465     case 'n':
2466     break;
2467
2468     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2469     option to the specified value. This form uses long names. We need to handle
2470     -O option=value and -Ooption=value. */
2471
2472     case 'O':
2473     if (*argrest == 0)
2474       {
2475       if (++i >= argc)
2476         {
2477         fprintf(stderr, "exim: string expected after -O\n");
2478         exit(EXIT_FAILURE);
2479         }
2480       }
2481     break;
2482
2483     case 'o':
2484
2485     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2486     file" option). */
2487
2488     if (*argrest == 'A')
2489       {
2490       alias_arg = argrest + 1;
2491       if (alias_arg[0] == 0)
2492         {
2493         if (i+1 < argc) alias_arg = argv[++i]; else
2494           {
2495           fprintf(stderr, "exim: string expected after -oA\n");
2496           exit(EXIT_FAILURE);
2497           }
2498         }
2499       }
2500
2501     /* -oB: Set a connection message max value for remote deliveries */
2502
2503     else if (*argrest == 'B')
2504       {
2505       uschar *p = argrest + 1;
2506       if (p[0] == 0)
2507         {
2508         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2509           {
2510           connection_max_messages = 1;
2511           p = NULL;
2512           }
2513         }
2514
2515       if (p != NULL)
2516         {
2517         if (!isdigit(*p))
2518           {
2519           fprintf(stderr, "exim: number expected after -oB\n");
2520           exit(EXIT_FAILURE);
2521           }
2522         connection_max_messages = Uatoi(p);
2523         }
2524       }
2525
2526     /* -odb: background delivery */
2527
2528     else if (Ustrcmp(argrest, "db") == 0)
2529       {
2530       synchronous_delivery = FALSE;
2531       arg_queue_only = FALSE;
2532       queue_only_set = TRUE;
2533       }
2534
2535     /* -odf: foreground delivery (smail-compatible option); same effect as
2536        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2537     */
2538
2539     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2540       {
2541       synchronous_delivery = TRUE;
2542       arg_queue_only = FALSE;
2543       queue_only_set = TRUE;
2544       }
2545
2546     /* -odq: queue only */
2547
2548     else if (Ustrcmp(argrest, "dq") == 0)
2549       {
2550       synchronous_delivery = FALSE;
2551       arg_queue_only = TRUE;
2552       queue_only_set = TRUE;
2553       }
2554
2555     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2556     but no remote delivery */
2557
2558     else if (Ustrcmp(argrest, "dqs") == 0)
2559       {
2560       queue_smtp = TRUE;
2561       arg_queue_only = FALSE;
2562       queue_only_set = TRUE;
2563       }
2564
2565     /* -oex: Sendmail error flags. As these are also accepted without the
2566     leading -o prefix, for compatibility with vacation and other callers,
2567     they are handled with -e above. */
2568
2569     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2570        -oitrue: Another sendmail syntax for the same */
2571
2572     else if (Ustrcmp(argrest, "i") == 0 ||
2573              Ustrcmp(argrest, "itrue") == 0)
2574       dot_ends = FALSE;
2575
2576     /* -oM*: Set various characteristics for an incoming message; actually
2577     acted on for trusted callers only. */
2578
2579     else if (*argrest == 'M')
2580       {
2581       if (i+1 >= argc)
2582         {
2583         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2584         exit(EXIT_FAILURE);
2585         }
2586
2587       /* -oMa: Set sender host address */
2588
2589       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2590
2591       /* -oMaa: Set authenticator name */
2592
2593       else if (Ustrcmp(argrest, "Maa") == 0)
2594         sender_host_authenticated = argv[++i];
2595
2596       /* -oMas: setting authenticated sender */
2597
2598       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2599
2600       /* -oMai: setting authenticated id */
2601
2602       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2603
2604       /* -oMi: Set incoming interface address */
2605
2606       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2607
2608       /* -oMr: Received protocol */
2609
2610       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2611
2612       /* -oMs: Set sender host name */
2613
2614       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2615
2616       /* -oMt: Set sender ident */
2617
2618       else if (Ustrcmp(argrest, "Mt") == 0)
2619         {
2620         sender_ident_set = TRUE;
2621         sender_ident = argv[++i];
2622         }
2623
2624       /* Else a bad argument */
2625
2626       else
2627         {
2628         badarg = TRUE;
2629         break;
2630         }
2631       }
2632
2633     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2634     seem to call this as -m (undocumented), so that is also accepted (see
2635     above). */
2636
2637     else if (Ustrcmp(argrest, "m") == 0) {}
2638
2639     /* -oo: An ancient flag for old-style addresses which still seems to
2640     crop up in some calls (see in SCO). */
2641
2642     else if (Ustrcmp(argrest, "o") == 0) {}
2643
2644     /* -oP <name>: set pid file path for daemon */
2645
2646     else if (Ustrcmp(argrest, "P") == 0)
2647       override_pid_file_path = argv[++i];
2648
2649     /* -or <n>: set timeout for non-SMTP acceptance
2650        -os <n>: set timeout for SMTP acceptance */
2651
2652     else if (*argrest == 'r' || *argrest == 's')
2653       {
2654       int *tp = (*argrest == 'r')?
2655         &arg_receive_timeout : &arg_smtp_receive_timeout;
2656       if (argrest[1] == 0)
2657         {
2658         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2659         }
2660       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2661       if (*tp < 0)
2662         {
2663         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2664         exit(EXIT_FAILURE);
2665         }
2666       }
2667
2668     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2669
2670     else if (Ustrcmp(argrest, "X") == 0)
2671       override_local_interfaces = argv[++i];
2672
2673     /* Unknown -o argument */
2674
2675     else badarg = TRUE;
2676     break;
2677
2678
2679     /* -ps: force Perl startup; -pd force delayed Perl startup */
2680
2681     case 'p':
2682     #ifdef EXIM_PERL
2683     if (*argrest == 's' && argrest[1] == 0)
2684       {
2685       perl_start_option = 1;
2686       break;
2687       }
2688     if (*argrest == 'd' && argrest[1] == 0)
2689       {
2690       perl_start_option = -1;
2691       break;
2692       }
2693     #endif
2694
2695     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2696     which sets the host protocol and host name */
2697
2698     if (*argrest == 0)
2699       {
2700       if (i+1 < argc) argrest = argv[++i]; else
2701         { badarg = TRUE; break; }
2702       }
2703
2704     if (*argrest != 0)
2705       {
2706       uschar *hn = Ustrchr(argrest, ':');
2707       if (hn == NULL)
2708         {
2709         received_protocol = argrest;
2710         }
2711       else
2712         {
2713         received_protocol = string_copyn(argrest, hn - argrest);
2714         sender_host_name = hn + 1;
2715         }
2716       }
2717     break;
2718
2719
2720     case 'q':
2721     receiving_message = FALSE;
2722     if (queue_interval >= 0)
2723       {
2724       fprintf(stderr, "exim: -q specified more than once\n");
2725       exit(EXIT_FAILURE);
2726       }
2727
2728     /* -qq...: Do queue runs in a 2-stage manner */
2729
2730     if (*argrest == 'q')
2731       {
2732       queue_2stage = TRUE;
2733       argrest++;
2734       }
2735
2736     /* -qi...: Do only first (initial) deliveries */
2737
2738     if (*argrest == 'i')
2739       {
2740       queue_run_first_delivery = TRUE;
2741       argrest++;
2742       }
2743
2744     /* -qf...: Run the queue, forcing deliveries
2745        -qff..: Ditto, forcing thawing as well */
2746
2747     if (*argrest == 'f')
2748       {
2749       queue_run_force = TRUE;
2750       if (*(++argrest) == 'f')
2751         {
2752         deliver_force_thaw = TRUE;
2753         argrest++;
2754         }
2755       }
2756
2757     /* -q[f][f]l...: Run the queue only on local deliveries */
2758
2759     if (*argrest == 'l')
2760       {
2761       queue_run_local = TRUE;
2762       argrest++;
2763       }
2764
2765     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2766     optionally starting from a given message id. */
2767
2768     if (*argrest == 0 &&
2769         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2770       {
2771       queue_interval = 0;
2772       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2773         start_queue_run_id = argv[++i];
2774       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2775         stop_queue_run_id = argv[++i];
2776       }
2777
2778     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2779     optionally local only. */
2780
2781     else
2782       {
2783       if (*argrest != 0)
2784         queue_interval = readconf_readtime(argrest, 0, FALSE);
2785       else
2786         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2787       if (queue_interval <= 0)
2788         {
2789         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2790         exit(EXIT_FAILURE);
2791         }
2792       }
2793     break;
2794
2795
2796     case 'R':   /* Synonymous with -qR... */
2797     receiving_message = FALSE;
2798
2799     /* -Rf:   As -R (below) but force all deliveries,
2800        -Rff:  Ditto, but also thaw all frozen messages,
2801        -Rr:   String is regex
2802        -Rrf:  Regex and force
2803        -Rrff: Regex and force and thaw
2804
2805     in all cases provided there are no further characters in this
2806     argument. */
2807
2808     if (*argrest != 0)
2809       {
2810       int i;
2811       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2812         {
2813         if (Ustrcmp(argrest, rsopts[i]) == 0)
2814           {
2815           if (i != 2) queue_run_force = TRUE;
2816           if (i >= 2) deliver_selectstring_regex = TRUE;
2817           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2818           argrest += Ustrlen(rsopts[i]);
2819           }
2820         }
2821       }
2822
2823     /* -R: Set string to match in addresses for forced queue run to
2824     pick out particular messages. */
2825
2826     if (*argrest == 0)
2827       {
2828       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2829         {
2830         fprintf(stderr, "exim: string expected after -R\n");
2831         exit(EXIT_FAILURE);
2832         }
2833       }
2834     else deliver_selectstring = argrest;
2835     break;
2836
2837
2838     /* -r: an obsolete synonym for -f (see above) */
2839
2840
2841     /* -S: Like -R but works on sender. */
2842
2843     case 'S':   /* Synonymous with -qS... */
2844     receiving_message = FALSE;
2845
2846     /* -Sf:   As -S (below) but force all deliveries,
2847        -Sff:  Ditto, but also thaw all frozen messages,
2848        -Sr:   String is regex
2849        -Srf:  Regex and force
2850        -Srff: Regex and force and thaw
2851
2852     in all cases provided there are no further characters in this
2853     argument. */
2854
2855     if (*argrest != 0)
2856       {
2857       int i;
2858       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2859         {
2860         if (Ustrcmp(argrest, rsopts[i]) == 0)
2861           {
2862           if (i != 2) queue_run_force = TRUE;
2863           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2864           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2865           argrest += Ustrlen(rsopts[i]);
2866           }
2867         }
2868       }
2869
2870     /* -S: Set string to match in addresses for forced queue run to
2871     pick out particular messages. */
2872
2873     if (*argrest == 0)
2874       {
2875       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2876         {
2877         fprintf(stderr, "exim: string expected after -S\n");
2878         exit(EXIT_FAILURE);
2879         }
2880       }
2881     else deliver_selectstring_sender = argrest;
2882     break;
2883
2884     /* -Tqt is an option that is exclusively for use by the testing suite.
2885     It is not recognized in other circumstances. It allows for the setting up
2886     of explicit "queue times" so that various warning/retry things can be
2887     tested. Otherwise variability of clock ticks etc. cause problems. */
2888
2889     case 'T':
2890     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2891       fudged_queue_times = argv[++i];
2892     else badarg = TRUE;
2893     break;
2894
2895
2896     /* -t: Set flag to extract recipients from body of message. */
2897
2898     case 't':
2899     if (*argrest == 0) extract_recipients = TRUE;
2900
2901     /* -ti: Set flag to extract recipients from body of message, and also
2902     specify that dot does not end the message. */
2903
2904     else if (Ustrcmp(argrest, "i") == 0)
2905       {
2906       extract_recipients = TRUE;
2907       dot_ends = FALSE;
2908       }
2909
2910     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2911
2912     #ifdef SUPPORT_TLS
2913     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2914     #endif
2915
2916     else badarg = TRUE;
2917     break;
2918
2919
2920     /* -U: This means "initial user submission" in sendmail, apparently. The
2921     doc claims that in future sendmail may refuse syntactically invalid
2922     messages instead of fixing them. For the moment, we just ignore it. */
2923
2924     case 'U':
2925     break;
2926
2927
2928     /* -v: verify things - this is a very low-level debugging */
2929
2930     case 'v':
2931     if (*argrest == 0)
2932       {
2933       debug_selector |= D_v;
2934       debug_file = stderr;
2935       }
2936     else badarg = TRUE;
2937     break;
2938
2939
2940     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2941
2942       The -x flag tells the sendmail command that mail from a local
2943       mail program has National Language Support (NLS) extended characters
2944       in the body of the mail item. The sendmail command can send mail with
2945       extended NLS characters across networks that normally corrupts these
2946       8-bit characters.
2947
2948     As Exim is 8-bit clean, it just ignores this flag. */
2949
2950     case 'x':
2951     if (*argrest != 0) badarg = TRUE;
2952     break;
2953
2954     /* All other initial characters are errors */
2955
2956     default:
2957     badarg = TRUE;
2958     break;
2959     }         /* End of high-level switch statement */
2960
2961   /* Failed to recognize the option, or syntax error */
2962
2963   if (badarg)
2964     {
2965     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2966       "option %s\n", arg);
2967     exit(EXIT_FAILURE);
2968     }
2969   }
2970
2971
2972 /* If -R or -S have been specified without -q, assume a single queue run. */
2973
2974 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2975   queue_interval < 0) queue_interval = 0;
2976
2977
2978 END_ARG:
2979 /* If usage_wanted is set we call the usage function - which never returns */
2980 if (usage_wanted) exim_usage(called_as);
2981
2982 /* Arguments have been processed. Check for incompatibilities. */
2983 if ((
2984     (smtp_input || extract_recipients || recipients_arg < argc) &&
2985     (daemon_listen || queue_interval >= 0 || bi_option ||
2986       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2987       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2988     ) ||
2989     (
2990     msg_action_arg > 0 &&
2991     (daemon_listen || queue_interval >= 0 || list_options ||
2992       (checking && msg_action != MSG_LOAD) ||
2993       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2994     ) ||
2995     (
2996     (daemon_listen || queue_interval >= 0) &&
2997     (sender_address != NULL || list_options || list_queue || checking ||
2998       bi_option)
2999     ) ||
3000     (
3001     daemon_listen && queue_interval == 0
3002     ) ||
3003     (
3004     list_options &&
3005     (checking || smtp_input || extract_recipients ||
3006       filter_test != FTEST_NONE || bi_option)
3007     ) ||
3008     (
3009     verify_address_mode &&
3010     (address_test_mode || smtp_input || extract_recipients ||
3011       filter_test != FTEST_NONE || bi_option)
3012     ) ||
3013     (
3014     address_test_mode && (smtp_input || extract_recipients ||
3015       filter_test != FTEST_NONE || bi_option)
3016     ) ||
3017     (
3018     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3019       extract_recipients)
3020     ) ||
3021     (
3022     deliver_selectstring != NULL && queue_interval < 0
3023     ) ||
3024     (
3025     msg_action == MSG_LOAD &&
3026       (!expansion_test || expansion_test_message != NULL)
3027     )
3028    )
3029   {
3030   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3031   exit(EXIT_FAILURE);
3032   }
3033
3034 /* If debugging is set up, set the file and the file descriptor to pass on to
3035 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3036 to run in the foreground. */
3037
3038 if (debug_selector != 0)
3039   {
3040   debug_file = stderr;
3041   debug_fd = fileno(debug_file);
3042   background_daemon = FALSE;
3043   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
3044   if (debug_selector != D_v)    /* -v only doesn't show this */
3045     {
3046     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3047       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3048       debug_selector);
3049     show_whats_supported(stderr);
3050     }
3051   }
3052
3053 /* When started with root privilege, ensure that the limits on the number of
3054 open files and the number of processes (where that is accessible) are
3055 sufficiently large, or are unset, in case Exim has been called from an
3056 environment where the limits are screwed down. Not all OS have the ability to
3057 change some of these limits. */
3058
3059 if (unprivileged)
3060   {
3061   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3062   }
3063 else
3064   {
3065   struct rlimit rlp;
3066
3067   #ifdef RLIMIT_NOFILE
3068   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3069     {
3070     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3071       strerror(errno));
3072     rlp.rlim_cur = rlp.rlim_max = 0;
3073     }
3074
3075   /* I originally chose 1000 as a nice big number that was unlikely to
3076   be exceeded. It turns out that some older OS have a fixed upper limit of
3077   256. */
3078
3079   if (rlp.rlim_cur < 1000)
3080     {
3081     rlp.rlim_cur = rlp.rlim_max = 1000;
3082     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3083       {
3084       rlp.rlim_cur = rlp.rlim_max = 256;
3085       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3086         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3087           strerror(errno));
3088       }
3089     }
3090   #endif
3091
3092   #ifdef RLIMIT_NPROC
3093   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3094     {
3095     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3096       strerror(errno));
3097     rlp.rlim_cur = rlp.rlim_max = 0;
3098     }
3099
3100   #ifdef RLIM_INFINITY
3101   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3102     {
3103     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3104   #else
3105   if (rlp.rlim_cur < 1000)
3106     {
3107     rlp.rlim_cur = rlp.rlim_max = 1000;
3108   #endif
3109     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3110       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3111         strerror(errno));
3112     }
3113   #endif
3114   }
3115
3116 /* Exim is normally entered as root (but some special configurations are
3117 possible that don't do this). However, it always spins off sub-processes that
3118 set their uid and gid as required for local delivery. We don't want to pass on
3119 any extra groups that root may belong to, so we want to get rid of them all at
3120 this point.
3121
3122 We need to obey setgroups() at this stage, before possibly giving up root
3123 privilege for a changed configuration file, but later on we might need to
3124 check on the additional groups for the admin user privilege - can't do that
3125 till after reading the config, which might specify the exim gid. Therefore,
3126 save the group list here first. */
3127
3128 group_count = getgroups(NGROUPS_MAX, group_list);
3129
3130 /* There is a fundamental difference in some BSD systems in the matter of
3131 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3132 known not to be different. On the "different" systems there is a single group
3133 list, and the first entry in it is the current group. On all other versions of
3134 Unix there is a supplementary group list, which is in *addition* to the current
3135 group. Consequently, to get rid of all extraneous groups on a "standard" system
3136 you pass over 0 groups to setgroups(), while on a "different" system you pass
3137 over a single group - the current group, which is always the first group in the
3138 list. Calling setgroups() with zero groups on a "different" system results in
3139 an error return. The following code should cope with both types of system.
3140
3141 However, if this process isn't running as root, setgroups() can't be used
3142 since you have to be root to run it, even if throwing away groups. Not being
3143 root here happens only in some unusual configurations. We just ignore the
3144 error. */
3145
3146 if (setgroups(0, NULL) != 0)
3147   {
3148   if (setgroups(1, group_list) != 0 && !unprivileged)
3149     {
3150     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3151     exit(EXIT_FAILURE);
3152     }
3153   }
3154
3155 /* If the configuration file name has been altered by an argument on the
3156 command line (either a new file name or a macro definition) and the caller is
3157 not root or the exim user, or if this is a filter testing run, remove any
3158 setuid privilege the program has, and run as the underlying user.
3159
3160 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3161 severely restricts the use of -C for some purposes.
3162
3163 Otherwise, set the real ids to the effective values (should be root unless run
3164 from inetd, which it can either be root or the exim uid, if one is configured).
3165
3166 There is a private mechanism for bypassing some of this, in order to make it
3167 possible to test lots of configurations automatically, without having either to
3168 recompile each time, or to patch in an actual configuration file name and other
3169 values (such as the path name). If running in the test harness, pretend that
3170 configuration file changes and macro definitions haven't happened. */
3171
3172 if ((                                            /* EITHER */
3173     (config_changed || macros != NULL) &&        /* Config changed, and */
3174     real_uid != root_uid &&                      /* Not root, and */
3175     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3176     real_uid != exim_uid &&                      /* Not exim, and */
3177     #endif
3178     !running_in_test_harness                     /* Not fudged */
3179     ) ||                                         /*   OR   */
3180     expansion_test                               /* expansion testing */
3181     ||                                           /*   OR   */
3182     filter_test != FTEST_NONE)                   /* Filter testing */
3183   {
3184   setgroups(group_count, group_list);
3185   exim_setugid(real_uid, real_gid, FALSE,
3186     US"-C, -D, -be or -bf forces real uid");
3187   removed_privilege = TRUE;
3188
3189   /* In the normal case when Exim is called like this, stderr is available
3190   and should be used for any logging information because attempts to write
3191   to the log will usually fail. To arrange this, we unset really_exim. However,
3192   if no stderr is available there is no point - we might as well have a go
3193   at the log (if it fails, syslog will be written). */
3194
3195   if (log_stderr != NULL) really_exim = FALSE;
3196   }
3197
3198 /* Privilege is to be retained for the moment. It may be dropped later,
3199 depending on the job that this Exim process has been asked to do. For now, set
3200 the real uid to the effective so that subsequent re-execs of Exim are done by a
3201 privileged user. */
3202
3203 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3204
3205 /* If testing a filter, open the file(s) now, before wasting time doing other
3206 setups and reading the message. */
3207
3208 if ((filter_test & FTEST_SYSTEM) != 0)
3209   {
3210   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3211   if (filter_sfd < 0)
3212     {
3213     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3214       strerror(errno));
3215     return EXIT_FAILURE;
3216     }
3217   }
3218
3219 if ((filter_test & FTEST_USER) != 0)
3220   {
3221   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3222   if (filter_ufd < 0)
3223     {
3224     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3225       strerror(errno));
3226     return EXIT_FAILURE;
3227     }
3228   }
3229
3230 /* Read the main runtime configuration data; this gives up if there
3231 is a failure. It leaves the configuration file open so that the subsequent
3232 configuration data for delivery can be read if needed. */
3233
3234 readconf_main();
3235
3236 /* Handle the decoding of logging options. */
3237
3238 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3239   log_options, log_options_count, US"log");
3240
3241 DEBUG(D_any)
3242   {
3243   debug_printf("configuration file is %s\n", config_main_filename);
3244   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3245     log_extra_selector);
3246   }
3247
3248 /* If domain literals are not allowed, check the sender address that was
3249 supplied with -f. Ditto for a stripped trailing dot. */
3250
3251 if (sender_address != NULL)
3252   {
3253   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3254     {
3255     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3256       "allowed\n", sender_address);
3257     return EXIT_FAILURE;
3258     }
3259   if (f_end_dot && !strip_trailing_dot)
3260     {
3261     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3262       "(trailing dot not allowed)\n", sender_address);
3263     return EXIT_FAILURE;
3264     }
3265   }
3266
3267 /* Paranoia check of maximum lengths of certain strings. There is a check
3268 on the length of the log file path in log.c, which will come into effect
3269 if there are any calls to write the log earlier than this. However, if we
3270 get this far but the string is very long, it is better to stop now than to
3271 carry on and (e.g.) receive a message and then have to collapse. The call to
3272 log_write() from here will cause the ultimate panic collapse if the complete
3273 file name exceeds the buffer length. */
3274
3275 if (Ustrlen(log_file_path) > 200)
3276   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3277     "log_file_path is longer than 200 chars: aborting");
3278
3279 if (Ustrlen(pid_file_path) > 200)
3280   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3281     "pid_file_path is longer than 200 chars: aborting");
3282
3283 if (Ustrlen(spool_directory) > 200)
3284   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3285     "spool_directory is longer than 200 chars: aborting");
3286
3287 /* Length check on the process name given to syslog for its TAG field,
3288 which is only permitted to be 32 characters or less. See RFC 3164. */
3289
3290 if (Ustrlen(syslog_processname) > 32)
3291   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3292     "syslog_processname is longer than 32 chars: aborting");
3293
3294 /* In some operating systems, the environment variable TMPDIR controls where
3295 temporary files are created; Exim doesn't use these (apart from when delivering
3296 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3297 If TMPDIR is found in the environment, reset it to the value defined in the
3298 TMPDIR macro, if this macro is defined. */
3299
3300 #ifdef TMPDIR
3301   {
3302   uschar **p;
3303   for (p = USS environ; *p != NULL; p++)
3304     {
3305     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3306         Ustrcmp(*p+7, TMPDIR) != 0)
3307       {
3308       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3309       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3310       *p = newp;
3311       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3312       }
3313     }
3314   }
3315 #endif
3316
3317 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3318 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3319 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3320 called by a user who has set the TZ variable. This then affects the timestamps
3321 in log files and in Received: headers, and any created Date: header lines. The
3322 required timezone is settable in the configuration file, so nothing can be done
3323 about this earlier - but hopefully nothing will normally be logged earlier than
3324 this. We have to make a new environment if TZ is wrong, but don't bother if
3325 timestamps_utc is set, because then all times are in UTC anyway. */
3326
3327 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3328   {
3329   timestamps_utc = TRUE;
3330   }
3331 else
3332   {
3333   uschar *envtz = US getenv("TZ");
3334   if ((envtz == NULL && timezone_string != NULL) ||
3335       (envtz != NULL &&
3336         (timezone_string == NULL ||
3337          Ustrcmp(timezone_string, envtz) != 0)))
3338     {
3339     uschar **p = USS environ;
3340     uschar **new;
3341     uschar **newp;
3342     int count = 0;
3343     while (*p++ != NULL) count++;
3344     if (envtz == NULL) count++;
3345     newp = new = malloc(sizeof(uschar *) * (count + 1));
3346     for (p = USS environ; *p != NULL; p++)
3347       {
3348       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3349       *newp++ = *p;
3350       }
3351     if (timezone_string != NULL)
3352       {
3353       *newp = malloc(Ustrlen(timezone_string) + 4);
3354       sprintf(CS *newp++, "TZ=%s", timezone_string);
3355       }
3356     *newp = NULL;
3357     environ = CSS new;
3358     tzset();
3359     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3360       tod_stamp(tod_log));
3361     }
3362   }
3363
3364 /* Handle the case when we have removed the setuid privilege because of -C or
3365 -D. This means that the caller of Exim was not root, and, provided that
3366 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3367 the binary.
3368
3369 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3370 were running as the exim user defined in the configuration file (different to
3371 the one in the binary). The sysadmin may expect this case to retain privilege
3372 because "the binary was called by the Exim user", but it hasn't, because of the
3373 order in which it handles this stuff. There are two possibilities:
3374
3375   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3376       to do message deliveries. Thus, the fact that it is running as a
3377       non-privileged user is plausible, and might be wanted in some special
3378       configurations. However, really_exim will have been set false when
3379       privilege was dropped, to stop Exim trying to write to its normal log
3380       files. Therefore, re-enable normal log processing, assuming the sysadmin
3381       has set up the log directory correctly.
3382
3383   (2) If deliver_drop_privilege is not set, the configuration won't work as
3384       apparently intended, and so we log a panic message. In order to retain
3385       root for -C or -D, the caller must either be root or the Exim user
3386       defined in the binary (when deliver_drop_ privilege is false).
3387
3388 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3389 built-in exim user or one defined in the configuration. In either event,
3390 re-enable log processing, assuming the sysadmin knows what they are doing. */
3391
3392 if (removed_privilege && (config_changed || macros != NULL) &&
3393     real_uid == exim_uid)
3394   {
3395   #ifdef ALT_CONFIG_ROOT_ONLY
3396   really_exim = TRUE;   /* let logging work normally */
3397   #else
3398
3399   if (deliver_drop_privilege)
3400     really_exim = TRUE; /* let logging work normally */
3401   else
3402     log_write(0, LOG_MAIN|LOG_PANIC,
3403       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3404       (int)exim_uid, config_changed? "-C" : "-D");
3405   #endif
3406   }
3407
3408 /* Start up Perl interpreter if Perl support is configured and there is a
3409 perl_startup option, and the configuration or the command line specifies
3410 initializing starting. Note that the global variables are actually called
3411 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3412
3413 #ifdef EXIM_PERL
3414 if (perl_start_option != 0)
3415   opt_perl_at_start = (perl_start_option > 0);
3416 if (opt_perl_at_start && opt_perl_startup != NULL)
3417   {
3418   uschar *errstr;
3419   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3420   errstr = init_perl(opt_perl_startup);
3421   if (errstr != NULL)
3422     {
3423     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3424     return EXIT_FAILURE;
3425     }
3426   opt_perl_started = TRUE;
3427   }
3428 #endif /* EXIM_PERL */
3429
3430 /* Log the arguments of the call if the configuration file said so. This is
3431 a debugging feature for finding out what arguments certain MUAs actually use.
3432 Don't attempt it if logging is disabled, or if listing variables or if
3433 verifying/testing addresses or expansions. */
3434
3435 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3436       && really_exim && !list_options && !checking)
3437   {
3438   int i;
3439   uschar *p = big_buffer;
3440   Ustrcpy(p, "cwd=");
3441   (void)getcwd(CS p+4, big_buffer_size - 4);
3442   while (*p) p++;
3443   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3444   while (*p) p++;
3445   for (i = 0; i < argc; i++)
3446     {
3447     int len = Ustrlen(argv[i]);
3448     uschar *printing;
3449     uschar *quote;
3450     if (p + len + 8 >= big_buffer + big_buffer_size)
3451       {
3452       Ustrcpy(p, " ...");
3453       log_write(0, LOG_MAIN, "%s", big_buffer);
3454       Ustrcpy(big_buffer, "...");
3455       p = big_buffer + 3;
3456       }
3457     printing = string_printing(argv[i]);
3458     if (printing[0] == 0) quote = US"\""; else
3459       {
3460       uschar *pp = printing;
3461       quote = US"";
3462       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3463       }
3464     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3465       (p - big_buffer) - 4), printing, quote);
3466     while (*p) p++;
3467     }
3468
3469   if ((log_extra_selector & LX_arguments) != 0)
3470     log_write(0, LOG_MAIN, "%s", big_buffer);
3471   else
3472     debug_printf("%s\n", big_buffer);
3473   }
3474
3475 /* Set the working directory to be the top-level spool directory. We don't rely
3476 on this in the code, which always uses fully qualified names, but it's useful
3477 for core dumps etc. Don't complain if it fails - the spool directory might not
3478 be generally accessible and calls with the -C option (and others) have lost
3479 privilege by now. Before the chdir, we try to ensure that the directory exists.
3480 */
3481
3482 if (Uchdir(spool_directory) != 0)
3483   {
3484   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3485   (void)Uchdir(spool_directory);
3486   }
3487
3488 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3489 alias file. Exim doesn't have such a concept, but this call is screwed into
3490 Sun's YP makefiles. Handle this by calling a configured script, as the real
3491 user who called Exim. The -oA option can be used to pass an argument to the
3492 script. */
3493
3494 if (bi_option)
3495   {
3496   (void)fclose(config_file);
3497   if (bi_command != NULL)
3498     {
3499     int i = 0;
3500     uschar *argv[3];
3501     argv[i++] = bi_command;
3502     if (alias_arg != NULL) argv[i++] = alias_arg;
3503     argv[i++] = NULL;
3504
3505     setgroups(group_count, group_list);
3506     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3507
3508     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3509       (argv[1] == NULL)? US"" : argv[1]);
3510
3511     execv(CS argv[0], (char *const *)argv);
3512     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3513     exit(EXIT_FAILURE);
3514     }
3515   else
3516     {
3517     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3518     exit(EXIT_SUCCESS);
3519     }
3520   }
3521
3522 /* If an action on specific messages is requested, or if a daemon or queue
3523 runner is being started, we need to know if Exim was called by an admin user.
3524 This is the case if the real user is root or exim, or if the real group is
3525 exim, or if one of the supplementary groups is exim or a group listed in
3526 admin_groups. We don't fail all message actions immediately if not admin_user,
3527 since some actions can be performed by non-admin users. Instead, set admin_user
3528 for later interrogation. */
3529
3530 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3531   admin_user = TRUE;
3532 else
3533   {
3534   int i, j;
3535   for (i = 0; i < group_count; i++)
3536     {
3537     if (group_list[i] == exim_gid) admin_user = TRUE;
3538     else if (admin_groups != NULL)
3539       {
3540       for (j = 1; j <= (int)(admin_groups[0]); j++)
3541         if (admin_groups[j] == group_list[i])
3542           { admin_user = TRUE; break; }
3543       }
3544     if (admin_user) break;
3545     }
3546   }
3547
3548 /* Another group of privileged users are the trusted users. These are root,
3549 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3550 are permitted to specify sender_addresses with -f on the command line, and
3551 other message parameters as well. */
3552
3553 if (real_uid == root_uid || real_uid == exim_uid)
3554   trusted_caller = TRUE;
3555 else
3556   {
3557   int i, j;
3558
3559   if (trusted_users != NULL)
3560     {
3561     for (i = 1; i <= (int)(trusted_users[0]); i++)
3562       if (trusted_users[i] == real_uid)
3563         { trusted_caller = TRUE; break; }
3564     }
3565
3566   if (!trusted_caller && trusted_groups != NULL)
3567     {
3568     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3569       {
3570       if (trusted_groups[i] == real_gid)
3571         trusted_caller = TRUE;
3572       else for (j = 0; j < group_count; j++)
3573         {
3574         if (trusted_groups[i] == group_list[j])
3575           { trusted_caller = TRUE; break; }
3576         }
3577       if (trusted_caller) break;
3578       }
3579     }
3580   }
3581
3582 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3583 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3584
3585 /* Only an admin user may start the daemon or force a queue run in the default
3586 configuration, but the queue run restriction can be relaxed. Only an admin
3587 user may request that a message be returned to its sender forthwith. Only an
3588 admin user may specify a debug level greater than D_v (because it might show
3589 passwords, etc. in lookup queries). Only an admin user may request a queue
3590 count. */
3591
3592 if (!admin_user)
3593   {
3594   BOOL debugset = (debug_selector & ~D_v) != 0;
3595   if (deliver_give_up || daemon_listen ||
3596      (count_queue && queue_list_requires_admin) ||
3597      (list_queue && queue_list_requires_admin) ||
3598      (queue_interval >= 0 && prod_requires_admin) ||
3599      (debugset && !running_in_test_harness))
3600     {
3601     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3602     exit(EXIT_FAILURE);
3603     }
3604   }
3605
3606 /* If the real user is not root or the exim uid, the argument for passing
3607 in an open TCP/IP connection for another message is not permitted, nor is
3608 running with the -N option for any delivery action, unless this call to exim is
3609 one that supplied an input message, or we are using a patched exim for
3610 regression testing. */
3611
3612 if (real_uid != root_uid && real_uid != exim_uid &&
3613      (continue_hostname != NULL ||
3614        (dont_deliver &&
3615          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3616        )) && !running_in_test_harness)
3617   {
3618   fprintf(stderr, "exim: Permission denied\n");
3619   return EXIT_FAILURE;
3620   }
3621
3622 /* If the caller is not trusted, certain arguments are ignored when running for
3623 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3624 Note that authority for performing certain actions on messages is tested in the
3625 queue_action() function. */
3626
3627 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3628   {
3629   sender_host_name = sender_host_address = interface_address =
3630     sender_ident = received_protocol = NULL;
3631   sender_host_port = interface_port = 0;
3632   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3633   }
3634
3635 /* If a sender host address is set, extract the optional port number off the
3636 end of it and check its syntax. Do the same thing for the interface address.
3637 Exim exits if the syntax is bad. */
3638
3639 else
3640   {
3641   if (sender_host_address != NULL)
3642     sender_host_port = check_port(sender_host_address);
3643   if (interface_address != NULL)
3644     interface_port = check_port(interface_address);
3645   }
3646
3647 /* If an SMTP message is being received check to see if the standard input is a
3648 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3649 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3650 barf. */
3651
3652 if (smtp_input)
3653   {
3654   union sockaddr_46 inetd_sock;
3655   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3656   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3657     {
3658     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3659     if (family == AF_INET || family == AF_INET6)
3660       {
3661       union sockaddr_46 interface_sock;
3662       size = sizeof(interface_sock);
3663
3664       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3665         interface_address = host_ntoa(-1, &interface_sock, NULL,
3666           &interface_port);
3667
3668       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3669
3670       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3671         {
3672         is_inetd = TRUE;
3673         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3674           NULL, &sender_host_port);
3675         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3676           "inetd is not supported when mua_wrapper is set");
3677         }
3678       else
3679         {
3680         fprintf(stderr,
3681           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3682         return EXIT_FAILURE;
3683         }
3684       }
3685     }
3686   }
3687
3688 /* If the load average is going to be needed while receiving a message, get it
3689 now for those OS that require the first call to os_getloadavg() to be done as
3690 root. There will be further calls later for each message received. */
3691
3692 #ifdef LOAD_AVG_NEEDS_ROOT
3693 if (receiving_message &&
3694       (queue_only_load >= 0 ||
3695         (is_inetd && smtp_load_reserve >= 0)
3696       ))
3697   {
3698   load_average = OS_GETLOADAVG();
3699   }
3700 #endif
3701
3702 /* The queue_only configuration option can be overridden by -odx on the command
3703 line, except that if queue_only_override is false, queue_only cannot be unset
3704 from the command line. */
3705
3706 if (queue_only_set && (queue_only_override || arg_queue_only))
3707   queue_only = arg_queue_only;
3708
3709 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3710 -or and -os. */
3711
3712 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3713 if (arg_smtp_receive_timeout >= 0)
3714   smtp_receive_timeout = arg_smtp_receive_timeout;
3715
3716 /* If Exim was started with root privilege, unless we have already removed the
3717 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3718 except when starting the daemon or doing some kind of delivery or address
3719 testing (-bt). These are the only cases when root need to be retained. We run
3720 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3721 retained only for starting the daemon. We always do the initgroups() in this
3722 situation (controlled by the TRUE below), in order to be as close as possible
3723 to the state Exim usually runs in. */
3724
3725 if (!unprivileged &&                      /* originally had root AND */
3726     !removed_privilege &&                 /* still got root AND      */
3727     !daemon_listen &&                     /* not starting the daemon */
3728     queue_interval <= 0 &&                /* (either kind of daemon) */
3729       (                                   /*    AND EITHER           */
3730       deliver_drop_privilege ||           /* requested unprivileged  */
3731         (                                 /*       OR                */
3732         queue_interval < 0 &&             /* not running the queue   */
3733         (msg_action_arg < 0 ||            /*       and               */
3734           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3735         (!checking || !address_test_mode) /* not address checking    */
3736         )
3737       ))
3738   {
3739   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3740   }
3741
3742 /* When we are retaining a privileged uid, we still change to the exim gid. */
3743
3744 else setgid(exim_gid);
3745
3746 /* Handle a request to list the delivery queue */
3747
3748 if (list_queue)
3749   {
3750   set_process_info("listing the queue");
3751   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3752   exit(EXIT_SUCCESS);
3753   }
3754
3755 /* Handle a request to count the delivery queue */
3756
3757 if (count_queue)
3758   {
3759   set_process_info("counting the queue");
3760   queue_count();
3761   exit(EXIT_SUCCESS);
3762   }
3763
3764 /* Handle actions on specific messages, except for the force delivery and
3765 message load actions, which are done below. Some actions take a whole list of
3766 message ids, which are known to continue up to the end of the arguments. Others
3767 take a single message id and then operate on the recipients list. */
3768
3769 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3770   {
3771   int yield = EXIT_SUCCESS;
3772   set_process_info("acting on specified messages");
3773
3774   if (!one_msg_action)
3775     {
3776     for (i = msg_action_arg; i < argc; i++)
3777       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3778         yield = EXIT_FAILURE;
3779     }
3780
3781   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3782     recipients_arg)) yield = EXIT_FAILURE;
3783   exit(yield);
3784   }
3785
3786 /* All the modes below here require the remaining configuration sections
3787 to be read, except that we can skip over the ACL setting when delivering
3788 specific messages, or doing a queue run. (For various testing cases we could
3789 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3790 for skipping. */
3791
3792 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3793
3794 /* The configuration data will have been read into POOL_PERM because we won't
3795 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3796 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3797 configuration were read into POOL_MAIN, because we don't do any resets till
3798 later on. However, it seems right, and it does ensure that both pools get used.
3799 */
3800
3801 store_pool = POOL_MAIN;
3802
3803 /* Handle the -brt option. This is for checking out retry configurations.
3804 The next three arguments are a domain name or a complete address, and
3805 optionally two error numbers. All it does is to call the function that
3806 scans the retry configuration data. */
3807
3808 if (test_retry_arg >= 0)
3809   {
3810   retry_config *yield;
3811   int basic_errno = 0;
3812   int more_errno = 0;
3813   uschar *s1, *s2;
3814
3815   if (test_retry_arg >= argc)
3816     {
3817     printf("-brt needs a domain or address argument\n");
3818     exim_exit(EXIT_FAILURE);
3819     }
3820   s1 = argv[test_retry_arg++];
3821   s2 = NULL;
3822
3823   /* If the first argument contains no @ and no . it might be a local user
3824   or it might be a single-component name. Treat as a domain. */
3825
3826   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3827     {
3828     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3829       "being \ntreated as a one-component domain, not as a local part.\n\n",
3830       s1);
3831     }
3832
3833   /* There may be an optional second domain arg. */
3834
3835   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3836     s2 = argv[test_retry_arg++];
3837
3838   /* The final arg is an error name */
3839
3840   if (test_retry_arg < argc)
3841     {
3842     uschar *ss = argv[test_retry_arg];
3843     uschar *error =
3844       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3845     if (error != NULL)
3846       {
3847       printf("%s\n", CS error);
3848       return EXIT_FAILURE;
3849       }
3850
3851     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3852     code > 100 as an error is for matching codes to the decade. Turn them into
3853     a real error code, off the decade. */
3854
3855     if (basic_errno == ERRNO_MAIL4XX ||
3856         basic_errno == ERRNO_RCPT4XX ||
3857         basic_errno == ERRNO_DATA4XX)
3858       {
3859       int code = (more_errno >> 8) & 255;
3860       if (code == 255)
3861         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3862       else if (code > 100)
3863         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3864       }
3865     }
3866
3867   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3868   if (yield == NULL) printf("No retry information found\n"); else
3869     {
3870     retry_rule *r;
3871     more_errno = yield->more_errno;
3872     printf("Retry rule: %s  ", yield->pattern);
3873
3874     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3875       {
3876       printf("quota%s%s  ",
3877         (more_errno > 0)? "_" : "",
3878         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3879       }
3880     else if (yield->basic_errno == ECONNREFUSED)
3881       {
3882       printf("refused%s%s  ",
3883         (more_errno > 0)? "_" : "",
3884         (more_errno == 'M')? "MX" :
3885         (more_errno == 'A')? "A" : "");
3886       }
3887     else if (yield->basic_errno == ETIMEDOUT)
3888       {
3889       printf("timeout");
3890       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3891       more_errno &= 255;
3892       if (more_errno != 0) printf("_%s",
3893         (more_errno == 'M')? "MX" : "A");
3894       printf("  ");
3895       }
3896     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3897       printf("auth_failed  ");
3898     else printf("*  ");
3899
3900     for (r = yield->rules; r != NULL; r = r->next)
3901       {
3902       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3903       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3904       if (r->rule == 'G')
3905         {
3906         int x = r->p2;
3907         int f = x % 1000;
3908         int d = 100;
3909         printf(",%d.", x/1000);
3910         do
3911           {
3912           printf("%d", f/d);
3913           f %= d;
3914           d /= 10;
3915           }
3916         while (f != 0);
3917         }
3918       printf("; ");
3919       }
3920
3921     printf("\n");
3922     }
3923   exim_exit(EXIT_SUCCESS);
3924   }
3925
3926 /* Handle a request to list one or more configuration options */
3927
3928 if (list_options)
3929   {
3930   set_process_info("listing variables");
3931   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3932     else for (i = recipients_arg; i < argc; i++)
3933       {
3934       if (i < argc - 1 &&
3935           (Ustrcmp(argv[i], "router") == 0 ||
3936            Ustrcmp(argv[i], "transport") == 0 ||
3937            Ustrcmp(argv[i], "authenticator") == 0))
3938         {
3939         readconf_print(argv[i+1], argv[i]);
3940         i++;
3941         }
3942       else readconf_print(argv[i], NULL);
3943       }
3944   exim_exit(EXIT_SUCCESS);
3945   }
3946
3947
3948 /* Handle a request to deliver one or more messages that are already on the
3949 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3950 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3951
3952 Delivery of specific messages is typically used for a small number when
3953 prodding by hand (when the option forced_delivery will be set) or when
3954 re-execing to regain root privilege. Each message delivery must happen in a
3955 separate process, so we fork a process for each one, and run them sequentially
3956 so that debugging output doesn't get intertwined, and to avoid spawning too
3957 many processes if a long list is given. However, don't fork for the last one;
3958 this saves a process in the common case when Exim is called to deliver just one
3959 message. */
3960
3961 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3962   {
3963   if (prod_requires_admin && !admin_user)
3964     {
3965     fprintf(stderr, "exim: Permission denied\n");
3966     exim_exit(EXIT_FAILURE);
3967     }
3968   set_process_info("delivering specified messages");
3969   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3970   for (i = msg_action_arg; i < argc; i++)
3971     {
3972     int status;
3973     pid_t pid;
3974     if (i == argc - 1)
3975       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3976     else if ((pid = fork()) == 0)
3977       {
3978       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3979       _exit(EXIT_SUCCESS);
3980       }
3981     else if (pid < 0)
3982       {
3983       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3984         strerror(errno));
3985       exim_exit(EXIT_FAILURE);
3986       }
3987     else wait(&status);
3988     }
3989   exim_exit(EXIT_SUCCESS);
3990   }
3991
3992
3993 /* If only a single queue run is requested, without SMTP listening, we can just
3994 turn into a queue runner, with an optional starting message id. */
3995
3996 if (queue_interval == 0 && !daemon_listen)
3997   {
3998   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3999     (start_queue_run_id == NULL)? US"" : US" starting at ",
4000     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4001     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
4002     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
4003   set_process_info("running the queue (single queue run)");
4004   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4005   exim_exit(EXIT_SUCCESS);
4006   }
4007
4008
4009 /* Find the login name of the real user running this process. This is always
4010 needed when receiving a message, because it is written into the spool file. It
4011 may also be used to construct a from: or a sender: header, and in this case we
4012 need the user's full name as well, so save a copy of it, checked for RFC822
4013 syntax and munged if necessary, if it hasn't previously been set by the -F
4014 argument. We may try to get the passwd entry more than once, in case NIS or
4015 other delays are in evidence. Save the home directory for use in filter testing
4016 (only). */
4017
4018 for (i = 0;;)
4019   {
4020   if ((pw = getpwuid(real_uid)) != NULL)
4021     {
4022     originator_login = string_copy(US pw->pw_name);
4023     originator_home = string_copy(US pw->pw_dir);
4024
4025     /* If user name has not been set by -F, set it from the passwd entry
4026     unless -f has been used to set the sender address by a trusted user. */
4027
4028     if (originator_name == NULL)
4029       {
4030       if (sender_address == NULL ||
4031            (!trusted_caller && filter_test == FTEST_NONE))
4032         {
4033         uschar *name = US pw->pw_gecos;
4034         uschar *amp = Ustrchr(name, '&');
4035         uschar buffer[256];
4036
4037         /* Most Unix specify that a '&' character in the gecos field is
4038         replaced by a copy of the login name, and some even specify that
4039         the first character should be upper cased, so that's what we do. */
4040
4041         if (amp != NULL)
4042           {
4043           int loffset;
4044           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4045             amp - name, name, &loffset, originator_login, amp + 1);
4046           buffer[loffset] = toupper(buffer[loffset]);
4047           name = buffer;
4048           }
4049
4050         /* If a pattern for matching the gecos field was supplied, apply
4051         it and then expand the name string. */
4052
4053         if (gecos_pattern != NULL && gecos_name != NULL)
4054           {
4055           const pcre *re;
4056           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4057
4058           if (regex_match_and_setup(re, name, 0, -1))
4059             {
4060             uschar *new_name = expand_string(gecos_name);
4061             expand_nmax = -1;
4062             if (new_name != NULL)
4063               {
4064               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4065                 "gecos field \"%s\"\n", new_name, name);
4066               name = new_name;
4067               }
4068             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4069               "\"%s\": %s\n", gecos_name, expand_string_message);
4070             }
4071           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4072             "gecos field \"%s\"\n", gecos_pattern, name);
4073           store_free((void *)re);
4074           }
4075         originator_name = string_copy(name);
4076         }
4077
4078       /* A trusted caller has used -f but not -F */
4079
4080       else originator_name = US"";
4081       }
4082
4083     /* Break the retry loop */
4084
4085     break;
4086     }
4087
4088   if (++i > finduser_retries) break;
4089   sleep(1);
4090   }
4091
4092 /* If we cannot get a user login, log the incident and give up, unless the
4093 configuration specifies something to use. When running in the test harness,
4094 any setting of unknown_login overrides the actual name. */
4095
4096 if (originator_login == NULL || running_in_test_harness)
4097   {
4098   if (unknown_login != NULL)
4099     {
4100     originator_login = expand_string(unknown_login);
4101     if (originator_name == NULL && unknown_username != NULL)
4102       originator_name = expand_string(unknown_username);
4103     if (originator_name == NULL) originator_name = US"";
4104     }
4105   if (originator_login == NULL)
4106     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4107       (int)real_uid);
4108   }
4109
4110 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4111 RFC822 address.*/
4112
4113 originator_name = string_copy(parse_fix_phrase(originator_name,
4114   Ustrlen(originator_name), big_buffer, big_buffer_size));
4115
4116 /* If a message is created by this call of Exim, the uid/gid of its originator
4117 are those of the caller. These values are overridden if an existing message is
4118 read in from the spool. */
4119
4120 originator_uid = real_uid;
4121 originator_gid = real_gid;
4122
4123 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4124   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4125
4126 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4127 returns. We leave this till here so that the originator_ fields are available
4128 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4129 mode. */
4130
4131 if (daemon_listen || queue_interval > 0)
4132   {
4133   if (mua_wrapper)
4134     {
4135     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4136     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4137       "mua_wrapper is set");
4138     }
4139   daemon_go();
4140   }
4141
4142 /* If the sender ident has not been set (by a trusted caller) set it to
4143 the caller. This will get overwritten below for an inetd call. If a trusted
4144 caller has set it empty, unset it. */
4145
4146 if (sender_ident == NULL) sender_ident = originator_login;
4147   else if (sender_ident[0] == 0) sender_ident = NULL;
4148
4149 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4150 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4151 originator_* variables set. */
4152
4153 if (test_rewrite_arg >= 0)
4154   {
4155   really_exim = FALSE;
4156   if (test_rewrite_arg >= argc)
4157     {
4158     printf("-brw needs an address argument\n");
4159     exim_exit(EXIT_FAILURE);
4160     }
4161   rewrite_test(argv[test_rewrite_arg]);
4162   exim_exit(EXIT_SUCCESS);
4163   }
4164
4165 /* A locally-supplied message is considered to be coming from a local user
4166 unless a trusted caller supplies a sender address with -f, or is passing in the
4167 message via SMTP (inetd invocation or otherwise). */
4168
4169 if ((sender_address == NULL && !smtp_input) ||
4170     (!trusted_caller && filter_test == FTEST_NONE))
4171   {
4172   sender_local = TRUE;
4173
4174   /* A trusted caller can supply authenticated_sender and authenticated_id
4175   via -oMas and -oMai and if so, they will already be set. Otherwise, force
4176   defaults except when host checking. */
4177
4178   if (authenticated_sender == NULL && !host_checking)
4179     authenticated_sender = string_sprintf("%s@%s", originator_login,
4180       qualify_domain_sender);
4181   if (authenticated_id == NULL && !host_checking)
4182     authenticated_id = originator_login;
4183   }
4184
4185 /* Trusted callers are always permitted to specify the sender address.
4186 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4187 is specified is the empty address. However, if a trusted caller does not
4188 specify a sender address for SMTP input, we leave sender_address unset. This
4189 causes the MAIL commands to be honoured. */
4190
4191 if ((!smtp_input && sender_address == NULL) ||
4192     !receive_check_set_sender(sender_address))
4193   {
4194   /* Either the caller is not permitted to set a general sender, or this is
4195   non-SMTP input and the trusted caller has not set a sender. If there is no
4196   sender, or if a sender other than <> is set, override with the originator's
4197   login (which will get qualified below), except when checking things. */
4198
4199   if (sender_address == NULL             /* No sender_address set */
4200        ||                                /*         OR            */
4201        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4202        !checking &&                      /* Not running tests, AND */
4203        filter_test == FTEST_NONE))       /* Not testing a filter */
4204     {
4205     sender_address = originator_login;
4206     sender_address_forced = FALSE;
4207     sender_address_domain = 0;
4208     }
4209   }
4210
4211 /* Remember whether an untrusted caller set the sender address */
4212
4213 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4214
4215 /* Ensure that the sender address is fully qualified unless it is the empty
4216 address, which indicates an error message, or doesn't exist (root caller, smtp
4217 interface, no -f argument). */
4218
4219 if (sender_address != NULL && sender_address[0] != 0 &&
4220     sender_address_domain == 0)
4221   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4222     qualify_domain_sender);
4223
4224 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4225
4226 /* Handle a request to verify a list of addresses, or test them for delivery.
4227 This must follow the setting of the sender address, since routers can be
4228 predicated upon the sender. If no arguments are given, read addresses from
4229 stdin. Set debug_level to at least D_v to get full output for address testing.
4230 */
4231
4232 if (verify_address_mode || address_test_mode)
4233   {
4234   int exit_value = 0;
4235   int flags = vopt_qualify;
4236
4237   if (verify_address_mode)
4238     {
4239     if (!verify_as_sender) flags |= vopt_is_recipient;
4240     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4241     }
4242
4243   else
4244     {
4245     flags |= vopt_is_recipient;
4246     debug_selector |= D_v;
4247     debug_file = stderr;
4248     debug_fd = fileno(debug_file);
4249     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4250     }
4251
4252   if (recipients_arg < argc)
4253     {
4254     while (recipients_arg < argc)
4255       {
4256       uschar *s = argv[recipients_arg++];
4257       while (*s != 0)
4258         {
4259         BOOL finished = FALSE;
4260         uschar *ss = parse_find_address_end(s, FALSE);
4261         if (*ss == ',') *ss = 0; else finished = TRUE;
4262         test_address(s, flags, &exit_value);
4263         s = ss;
4264         if (!finished)
4265           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4266         }
4267       }
4268     }
4269
4270   else for (;;)
4271     {
4272     uschar *s = get_stdinput(NULL, NULL);
4273     if (s == NULL) break;
4274     test_address(s, flags, &exit_value);
4275     }
4276
4277   route_tidyup();
4278   exim_exit(exit_value);
4279   }
4280
4281 /* Handle expansion checking. Either expand items on the command line, or read
4282 from stdin if there aren't any. If -Mset was specified, load the message so
4283 that its variables can be used, but restrict this facility to admin users.
4284 Otherwise, if -bem was used, read a message from stdin. */
4285
4286 if (expansion_test)
4287   {
4288   if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4289     {
4290     uschar spoolname[256];  /* Not big_buffer; used in spool_read_header() */
4291     if (!admin_user)
4292       {
4293       fprintf(stderr, "exim: permission denied\n");
4294       exit(EXIT_FAILURE);
4295       }
4296     message_id = argv[msg_action_arg];
4297     (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4298     if (!spool_open_datafile(message_id))
4299       printf ("Failed to load message datafile %s\n", message_id);
4300     if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4301       printf ("Failed to load message %s\n", message_id);
4302     }
4303
4304   /* Read a test message from a file. We fudge it up to be on stdin, saving
4305   stdin itself for later reading of expansion strings. */
4306
4307   else if (expansion_test_message != NULL)
4308     {
4309     int save_stdin = dup(0);
4310     int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4311     if (fd < 0)
4312       {
4313       fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4314         strerror(errno));
4315       return EXIT_FAILURE;
4316       }
4317     (void) dup2(fd, 0);
4318     filter_test = FTEST_USER;      /* Fudge to make it look like filter test */
4319     message_ended = END_NOTENDED;
4320     read_message_body(receive_msg(extract_recipients));
4321     message_linecount += body_linecount;
4322     (void)dup2(save_stdin, 0);
4323     (void)close(save_stdin);
4324     clearerr(stdin);               /* Required by Darwin */
4325     }
4326
4327   /* Allow $recipients for this testing */
4328
4329   enable_dollar_recipients = TRUE;
4330
4331   /* Expand command line items */
4332
4333   if (recipients_arg < argc)
4334     {
4335     while (recipients_arg < argc)
4336       {
4337       uschar *s = argv[recipients_arg++];
4338       uschar *ss = expand_string(s);
4339       if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4340       else printf("%s\n", CS ss);
4341       }
4342     }
4343
4344   /* Read stdin */
4345
4346   else
4347     {
4348     char *(*fn_readline)(char *) = NULL;
4349     char *(*fn_addhist)(char *) = NULL;
4350
4351     #ifdef USE_READLINE
4352     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4353     #endif
4354
4355     for (;;)
4356       {
4357       uschar *ss;
4358       uschar *source = get_stdinput(fn_readline, fn_addhist);
4359       if (source == NULL) break;
4360       ss = expand_string(source);
4361       if (ss == NULL)
4362         printf ("Failed: %s\n", expand_string_message);
4363       else printf("%s\n", CS ss);
4364       }
4365
4366     #ifdef USE_READLINE
4367     if (dlhandle != NULL) dlclose(dlhandle);
4368     #endif
4369     }
4370
4371   /* The data file will be open after -Mset */
4372
4373   if (deliver_datafile >= 0)
4374     {
4375     (void)close(deliver_datafile);
4376     deliver_datafile = -1;
4377     }
4378
4379   exim_exit(EXIT_SUCCESS);
4380   }
4381
4382
4383 /* The active host name is normally the primary host name, but it can be varied
4384 for hosts that want to play several parts at once. We need to ensure that it is
4385 set for host checking, and for receiving messages. */
4386
4387 smtp_active_hostname = primary_hostname;
4388 if (raw_active_hostname != NULL)
4389   {
4390   uschar *nah = expand_string(raw_active_hostname);
4391   if (nah == NULL)
4392     {
4393     if (!expand_string_forcedfail)
4394       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4395         "(smtp_active_hostname): %s", raw_active_hostname,
4396         expand_string_message);
4397     }
4398   else if (nah[0] != 0) smtp_active_hostname = nah;
4399   }
4400
4401 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4402 given IP address so that the blocking and relay configuration can be tested.
4403 Unless a sender_ident was set by -oMt, we discard it (the default is the
4404 caller's login name). An RFC 1413 call is made only if we are running in the
4405 test harness and an incoming interface and both ports are specified, because
4406 there is no TCP/IP call to find the ident for. */
4407
4408 if (host_checking)
4409   {
4410   int x[4];
4411   int size;
4412
4413   if (!sender_ident_set)
4414     {
4415     sender_ident = NULL;
4416     if (running_in_test_harness && sender_host_port != 0 &&
4417         interface_address != NULL && interface_port != 0)
4418       verify_get_ident(1413);
4419     }
4420
4421   /* In case the given address is a non-canonical IPv6 address, canonicize
4422   it. The code works for both IPv4 and IPv6, as it happens. */
4423
4424   size = host_aton(sender_host_address, x);
4425   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4426   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4427
4428   /* Now set up for testing */
4429
4430   host_build_sender_fullhost();
4431   smtp_input = TRUE;
4432   smtp_in = stdin;
4433   smtp_out = stdout;
4434   sender_local = FALSE;
4435   sender_host_notsocket = TRUE;
4436   debug_file = stderr;
4437   debug_fd = fileno(debug_file);
4438   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4439     "**** but without any ident (RFC 1413) callback.\n"
4440     "**** This is not for real!\n\n",
4441       sender_host_address);
4442
4443   if (verify_check_host(&hosts_connection_nolog) == OK)
4444     log_write_selector &= ~L_smtp_connection;
4445   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4446
4447   /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4448   because a log line has already been written for all its failure exists
4449   (usually "connection refused: <reason>") and writing another one is
4450   unnecessary clutter. */
4451
4452   if (smtp_start_session())
4453     {
4454     reset_point = store_get(0);
4455     for (;;)
4456       {
4457       store_reset(reset_point);
4458       if (smtp_setup_msg() <= 0) break;
4459       if (!receive_msg(FALSE)) break;
4460       }
4461     smtp_log_no_mail();
4462     }
4463   exim_exit(EXIT_SUCCESS);
4464   }
4465
4466
4467 /* Arrange for message reception if recipients or SMTP were specified;
4468 otherwise complain unless a version print (-bV) happened or this is a filter
4469 verification test. In the former case, show the configuration file name. */
4470
4471 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4472   {
4473   if (version_printed)
4474     {
4475     printf("Configuration file is %s\n", config_main_filename);
4476     return EXIT_SUCCESS;
4477     }
4478
4479   if (filter_test == FTEST_NONE)
4480     exim_usage(called_as);
4481   }
4482
4483
4484 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4485 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4486 that we are not called from inetd, because that is rejected above. The
4487 following configuration settings are forced here:
4488
4489   (1) Synchronous delivery (-odi)
4490   (2) Errors to stderr (-oep == -oeq)
4491   (3) No parallel remote delivery
4492   (4) Unprivileged delivery
4493
4494 We don't force overall queueing options because there are several of them;
4495 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4496 to override any SMTP queueing. */
4497
4498 if (mua_wrapper)
4499   {
4500   synchronous_delivery = TRUE;
4501   arg_error_handling = ERRORS_STDERR;
4502   remote_max_parallel = 1;
4503   deliver_drop_privilege = TRUE;
4504   queue_smtp = FALSE;
4505   queue_smtp_domains = NULL;
4506   }
4507
4508
4509 /* Prepare to accept one or more new messages on the standard input. When a
4510 message has been read, its id is returned in message_id[]. If doing immediate
4511 delivery, we fork a delivery process for each received message, except for the
4512 last one, where we can save a process switch.
4513
4514 It is only in non-smtp mode that error_handling is allowed to be changed from
4515 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4516 sendmail error modes other than -oem ever actually used? Later: yes.) */
4517
4518 if (!smtp_input) error_handling = arg_error_handling;
4519
4520 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4521 logging being sent down the socket and make an identd call to get the
4522 sender_ident. */
4523
4524 else if (is_inetd)
4525   {
4526   (void)fclose(stderr);
4527   exim_nullstd();                       /* Re-open to /dev/null */
4528   verify_get_ident(IDENT_PORT);
4529   host_build_sender_fullhost();
4530   set_process_info("handling incoming connection from %s via inetd",
4531     sender_fullhost);
4532   }
4533
4534 /* If the sender host address has been set, build sender_fullhost if it hasn't
4535 already been done (which it will have been for inetd). This caters for the
4536 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4537 so that the test for IP options is skipped for -bs input. */
4538
4539 if (sender_host_address != NULL && sender_fullhost == NULL)
4540   {
4541   host_build_sender_fullhost();
4542   set_process_info("handling incoming connection from %s via -oMa",
4543     sender_fullhost);
4544   sender_host_notsocket = TRUE;
4545   }
4546
4547 /* Otherwise, set the sender host as unknown except for inetd calls. This
4548 prevents host checking in the case of -bs not from inetd and also for -bS. */
4549
4550 else if (!is_inetd) sender_host_unknown = TRUE;
4551
4552 /* If stdout does not exist, then dup stdin to stdout. This can happen
4553 if exim is started from inetd. In this case fd 0 will be set to the socket,
4554 but fd 1 will not be set. This also happens for passed SMTP channels. */
4555
4556 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4557
4558 /* Set up the incoming protocol name and the state of the program. Root is
4559 allowed to force received protocol via the -oMr option above. If we have come
4560 via inetd, the process info has already been set up. We don't set
4561 received_protocol here for smtp input, as it varies according to
4562 batch/HELO/EHLO/AUTH/TLS. */
4563
4564 if (smtp_input)
4565   {
4566   if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4567     smtp_batched_input? "batched " : "",
4568     (sender_address!= NULL)? sender_address : originator_login);
4569   }
4570 else
4571   {
4572   if (received_protocol == NULL)
4573     received_protocol = string_sprintf("local%s", called_as);
4574   set_process_info("accepting a local non-SMTP message from <%s>",
4575     sender_address);
4576   }
4577
4578 /* Initialize the session_local_queue-only flag (this will be ignored if
4579 mua_wrapper is set) */
4580
4581 queue_check_only();
4582 session_local_queue_only = queue_only;
4583
4584 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4585 the spool if so configured. On failure, we must not attempt to send an error
4586 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4587 error code is given.) */
4588
4589 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4590   {
4591   fprintf(stderr, "exim: insufficient disk space\n");
4592   return EXIT_FAILURE;
4593   }
4594
4595 /* If this is smtp input of any kind, real or batched, handle the start of the
4596 SMTP session.
4597
4598 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4599 because a log line has already been written for all its failure exists
4600 (usually "connection refused: <reason>") and writing another one is
4601 unnecessary clutter. */
4602
4603 if (smtp_input)
4604   {
4605   smtp_in = stdin;
4606   smtp_out = stdout;
4607   if (verify_check_host(&hosts_connection_nolog) == OK)
4608     log_write_selector &= ~L_smtp_connection;
4609   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4610   if (!smtp_start_session())
4611     {
4612     mac_smtp_fflush();
4613     exim_exit(EXIT_SUCCESS);
4614     }
4615   }
4616
4617 /* Otherwise, set up the input size limit here. */
4618
4619 else
4620   {
4621   thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4622   if (expand_string_message != NULL)
4623     {
4624     if (thismessage_size_limit == -1)
4625       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4626         "message_size_limit: %s", expand_string_message);
4627     else
4628       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4629         "message_size_limit: %s", expand_string_message);
4630     }
4631   }
4632
4633 /* Loop for several messages when reading SMTP input. If we fork any child
4634 processes, we don't want to wait for them unless synchronous delivery is
4635 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4636 same as SIG_DFL, despite the fact that documentation often lists the default as
4637 "ignore". This is a confusing area. This is what I know:
4638
4639 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4640 processes that complete simply to go away without ever becoming defunct. You
4641 can't then wait for them - but we don't want to wait for them in the
4642 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4643 happen for all OS (e.g. *BSD is different).
4644
4645 But that's not the end of the story. Some (many? all?) systems have the
4646 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4647 has by default, so it seems that the difference is merely one of default
4648 (compare restarting vs non-restarting signals).
4649
4650 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4651 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4652 of the loop below. Paranoia rules.
4653
4654 February 2003: That's *still* not the end of the story. There are now versions
4655 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4656 process then calls waitpid(), a grumble is written to the system log, because
4657 this is logically inconsistent. In other words, it doesn't like the paranoia.
4658 As a consequenc of this, the waitpid() below is now excluded if we are sure
4659 that SIG_IGN works. */
4660
4661 if (!synchronous_delivery)
4662   {
4663   #ifdef SA_NOCLDWAIT
4664   struct sigaction act;
4665   act.sa_handler = SIG_IGN;
4666   sigemptyset(&(act.sa_mask));
4667   act.sa_flags = SA_NOCLDWAIT;
4668   sigaction(SIGCHLD, &act, NULL);
4669   #else
4670   signal(SIGCHLD, SIG_IGN);
4671   #endif
4672   }
4673
4674 /* Save the current store pool point, for resetting at the start of
4675 each message, and save the real sender address, if any. */
4676
4677 reset_point = store_get(0);
4678 real_sender_address = sender_address;
4679
4680 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4681 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4682 collapsed). */
4683
4684 while (more)
4685   {
4686   store_reset(reset_point);
4687   message_id[0] = 0;
4688
4689   /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4690   input and build the recipients list, before calling receive_msg() to read the
4691   message proper. Whatever sender address is given in the SMTP transaction is
4692   often ignored for local senders - we use the actual sender, which is normally
4693   either the underlying user running this process or a -f argument provided by
4694   a trusted caller. It is saved in real_sender_address. The test for whether to
4695   accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4696
4697   if (smtp_input)
4698     {
4699     int rc;
4700     if ((rc = smtp_setup_msg()) > 0)
4701       {
4702       if (real_sender_address != NULL &&
4703           !receive_check_set_sender(sender_address))
4704         {
4705         sender_address = raw_sender = real_sender_address;
4706         sender_address_unrewritten = NULL;
4707         }
4708
4709       /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4710       isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4711       the very end. The result of the ACL is ignored (as for other non-SMTP
4712       messages). It is run for its potential side effects. */
4713
4714       if (smtp_batched_input && acl_not_smtp_start != NULL)
4715         {
4716         uschar *user_msg, *log_msg;
4717         enable_dollar_recipients = TRUE;
4718         (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4719           &user_msg, &log_msg);
4720         enable_dollar_recipients = FALSE;
4721         }
4722
4723       /* Now get the data for the message */
4724
4725       more = receive_msg(extract_recipients);
4726       if (message_id[0] == 0)
4727         {
4728         if (more) continue;
4729         smtp_log_no_mail();               /* Log no mail if configured */
4730         exim_exit(EXIT_FAILURE);
4731         }
4732       }
4733     else
4734       {
4735       smtp_log_no_mail();               /* Log no mail if configured */
4736       exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4737       }
4738     }
4739
4740   /* In the non-SMTP case, we have all the information from the command
4741   line, but must process it in case it is in the more general RFC822
4742   format, and in any case, to detect syntax errors. Also, it appears that
4743   the use of comma-separated lists as single arguments is common, so we
4744   had better support them. */
4745
4746   else
4747     {
4748     int i;
4749     int rcount = 0;
4750     int count = argc - recipients_arg;
4751     uschar **list = argv + recipients_arg;
4752
4753     /* These options cannot be changed dynamically for non-SMTP messages */
4754
4755     active_local_sender_retain = local_sender_retain;
4756     active_local_from_check = local_from_check;
4757
4758     /* Save before any rewriting */
4759
4760     raw_sender = string_copy(sender_address);
4761
4762     /* Loop for each argument */
4763
4764     for (i = 0; i < count; i++)
4765       {
4766       int start, end, domain;
4767       uschar *errmess;
4768       uschar *s = list[i];
4769
4770       /* Loop for each comma-separated address */
4771
4772       while (*s != 0)
4773         {
4774         BOOL finished = FALSE;
4775         uschar *recipient;
4776         uschar *ss = parse_find_address_end(s, FALSE);
4777
4778         if (*ss == ',') *ss = 0; else finished = TRUE;
4779
4780         /* Check max recipients - if -t was used, these aren't recipients */
4781
4782         if (recipients_max > 0 && ++rcount > recipients_max &&
4783             !extract_recipients)
4784           {
4785           if (error_handling == ERRORS_STDERR)
4786             {
4787             fprintf(stderr, "exim: too many recipients\n");
4788             exim_exit(EXIT_FAILURE);
4789             }
4790           else
4791             {
4792             return
4793               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4794                 errors_sender_rc : EXIT_FAILURE;
4795             }
4796           }
4797
4798         recipient =
4799           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4800
4801         if (domain == 0 && !allow_unqualified_recipient)
4802           {
4803           recipient = NULL;
4804           errmess = US"unqualified recipient address not allowed";
4805           }
4806
4807         if (recipient == NULL)
4808           {
4809           if (error_handling == ERRORS_STDERR)
4810             {
4811             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4812               string_printing(list[i]), errmess);
4813             exim_exit(EXIT_FAILURE);
4814             }
4815           else
4816             {
4817             error_block eblock;
4818             eblock.next = NULL;
4819             eblock.text1 = string_printing(list[i]);
4820             eblock.text2 = errmess;
4821             return
4822               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4823                 errors_sender_rc : EXIT_FAILURE;
4824             }
4825           }
4826
4827         receive_add_recipient(recipient, -1);
4828         s = ss;
4829         if (!finished)
4830           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4831         }
4832       }
4833
4834     /* Show the recipients when debugging */
4835
4836     DEBUG(D_receive)
4837       {
4838       int i;
4839       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4840       if (recipients_list != NULL)
4841         {
4842         debug_printf("Recipients:\n");
4843         for (i = 0; i < recipients_count; i++)
4844           debug_printf("  %s\n", recipients_list[i].address);
4845         }
4846       }
4847
4848     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4849     ignored; rejecting here would just add complication, and it can just as
4850     well be done later. Allow $recipients to be visible in the ACL. */
4851
4852     if (acl_not_smtp_start != NULL)
4853       {
4854       uschar *user_msg, *log_msg;
4855       enable_dollar_recipients = TRUE;
4856       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4857         &user_msg, &log_msg);
4858       enable_dollar_recipients = FALSE;
4859       }
4860
4861     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4862     will just read the headers for the message, and not write anything onto the
4863     spool. */
4864
4865     message_ended = END_NOTENDED;
4866     more = receive_msg(extract_recipients);
4867
4868     /* more is always FALSE here (not SMTP message) when reading a message
4869     for real; when reading the headers of a message for filter testing,
4870     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4871
4872     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4873     }  /* Non-SMTP message reception */
4874
4875   /* If this is a filter testing run, there are headers in store, but
4876   no message on the spool. Run the filtering code in testing mode, setting
4877   the domain to the qualify domain and the local part to the current user,
4878   unless they have been set by options. The prefix and suffix are left unset
4879   unless specified. The the return path is set to to the sender unless it has
4880   already been set from a return-path header in the message. */
4881
4882   if (filter_test != FTEST_NONE)
4883     {
4884     deliver_domain = (ftest_domain != NULL)?
4885       ftest_domain : qualify_domain_recipient;
4886     deliver_domain_orig = deliver_domain;
4887     deliver_localpart = (ftest_localpart != NULL)?
4888       ftest_localpart : originator_login;
4889     deliver_localpart_orig = deliver_localpart;
4890     deliver_localpart_prefix = ftest_prefix;
4891     deliver_localpart_suffix = ftest_suffix;
4892     deliver_home = originator_home;
4893
4894     if (return_path == NULL)
4895       {
4896       printf("Return-path copied from sender\n");
4897       return_path = string_copy(sender_address);
4898       }
4899     else
4900       {
4901       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4902       }
4903     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4904
4905     receive_add_recipient(
4906       string_sprintf("%s%s%s@%s",
4907         (ftest_prefix == NULL)? US"" : ftest_prefix,
4908         deliver_localpart,
4909         (ftest_suffix == NULL)? US"" : ftest_suffix,
4910         deliver_domain), -1);
4911
4912     printf("Recipient   = %s\n", recipients_list[0].address);
4913     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4914     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4915
4916     (void)chdir("/");   /* Get away from wherever the user is running this from */
4917
4918     /* Now we run either a system filter test, or a user filter test, or both.
4919     In the latter case, headers added by the system filter will persist and be
4920     available to the user filter. We need to copy the filter variables
4921     explicitly. */
4922
4923     if ((filter_test & FTEST_SYSTEM) != 0)
4924       {
4925       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4926         exim_exit(EXIT_FAILURE);
4927       }
4928
4929     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4930
4931     if ((filter_test & FTEST_USER) != 0)
4932       {
4933       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4934         exim_exit(EXIT_FAILURE);
4935       }
4936
4937     exim_exit(EXIT_SUCCESS);
4938     }
4939
4940   /* Else act on the result of message reception. We should not get here unless
4941   message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4942   will be TRUE. If it is not, check on the number of messages received in this
4943   connection. */
4944
4945   if (!session_local_queue_only &&
4946       smtp_accept_queue_per_connection > 0 &&
4947       receive_messagecount > smtp_accept_queue_per_connection)
4948     {
4949     session_local_queue_only = TRUE;
4950     queue_only_reason = 2;
4951     }
4952
4953   /* Initialize local_queue_only from session_local_queue_only. If it is false,
4954   and queue_only_load is set, check that the load average is below it. If it is
4955   not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4956   default), we put the whole session into queue_only mode. It then remains this
4957   way for any subsequent messages on the same SMTP connection. This is a
4958   deliberate choice; even though the load average may fall, it doesn't seem
4959   right to deliver later messages on the same call when not delivering earlier
4960   ones. However, there are odd cases where this is not wanted, so this can be
4961   changed by setting queue_only_load_latch false. */
4962
4963   local_queue_only = session_local_queue_only;
4964   if (!local_queue_only && queue_only_load >= 0)
4965     {
4966     local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4967     if (local_queue_only)
4968       {
4969       queue_only_reason = 3;
4970       if (queue_only_load_latch) session_local_queue_only = TRUE;
4971       }
4972     }
4973
4974   /* If running as an MUA wrapper, all queueing options and freezing options
4975   are ignored. */
4976
4977   if (mua_wrapper)
4978     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4979
4980   /* Log the queueing here, when it will get a message id attached, but
4981   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4982   connections). */
4983
4984   if (local_queue_only) switch(queue_only_reason)
4985     {
4986     case 2:
4987     log_write(L_delay_delivery,
4988               LOG_MAIN, "no immediate delivery: more than %d messages "
4989       "received in one connection", smtp_accept_queue_per_connection);
4990     break;
4991
4992     case 3:
4993     log_write(L_delay_delivery,
4994               LOG_MAIN, "no immediate delivery: load average %.2f",
4995               (double)load_average/1000.0);
4996     break;
4997     }
4998
4999   /* Else do the delivery unless the ACL or local_scan() called for queue only
5000   or froze the message. Always deliver in a separate process. A fork failure is
5001   not a disaster, as the delivery will eventually happen on a subsequent queue
5002   run. The search cache must be tidied before the fork, as the parent will
5003   do it before exiting. The child will trigger a lookup failure and
5004   thereby defer the delivery if it tries to use (for example) a cached ldap
5005   connection that the parent has called unbind on. */
5006
5007   else if (!queue_only_policy && !deliver_freeze)
5008     {
5009     pid_t pid;
5010     search_tidyup();
5011
5012     if ((pid = fork()) == 0)
5013       {
5014       int rc;
5015       close_unwanted();      /* Close unwanted file descriptors and TLS */
5016       exim_nullstd();        /* Ensure std{in,out,err} exist */
5017
5018       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5019       mode, deliver_drop_privilege is forced TRUE). */
5020
5021       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5022         {
5023         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5024           message_id);
5025         /* Control does not return here. */
5026         }
5027
5028       /* No need to re-exec */
5029
5030       rc = deliver_message(message_id, FALSE, FALSE);
5031       search_tidyup();
5032       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5033         EXIT_SUCCESS : EXIT_FAILURE);
5034       }
5035
5036     if (pid < 0)
5037       {
5038       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5039         "process: %s", strerror(errno));
5040       }
5041
5042     /* In the parent, wait if synchronous delivery is required. This will
5043     always be the case in MUA wrapper mode. */
5044
5045     else if (synchronous_delivery)
5046       {
5047       int status;
5048       while (wait(&status) != pid);
5049       if ((status & 0x00ff) != 0)
5050         log_write(0, LOG_MAIN|LOG_PANIC,
5051           "process %d crashed with signal %d while delivering %s",
5052           (int)pid, status & 0x00ff, message_id);
5053       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5054       }
5055     }
5056
5057   /* The loop will repeat if more is TRUE. If we do not know know that the OS
5058   automatically reaps children (see comments above the loop), clear away any
5059   finished subprocesses here, in case there are lots of messages coming in
5060   from the same source. */
5061
5062   #ifndef SIG_IGN_WORKS
5063   while (waitpid(-1, NULL, WNOHANG) > 0);
5064   #endif
5065   }
5066
5067 exim_exit(EXIT_SUCCESS);   /* Never returns */
5068 return 0;                  /* To stop compiler warning */
5069 }
5070
5071 /* End of exim.c */