src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.35 2006/02/22 14:46:44 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   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 FILE *f;
 401 umask(0777);
 402 f = Ufopen(filename, options);
 403 umask(0);
 404 if (f != NULL) (void)fchmod(fileno(f), mode);
 405 return f;
 406 }
 407
 408
 409
 410
 411 /*************************************************
 412 *   Ensure stdin, stdout, and stderr exist       *
 413 *************************************************/
 414
 415 /* Some operating systems grumble if an exec() happens without a standard
 416 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 417 file will be opened and will use these fd values, and then some other bit of
 418 code will assume, for example, that it can write error messages to stderr.
 419 This function ensures that fds 0, 1, and 2 are open if they do not already
 420 exist, by connecting them to /dev/null.
 421
 422 This function is also used to ensure that std{in,out,err} exist at all times,
 423 so that if any library that Exim calls tries to use them, it doesn't crash.
 424
 425 Arguments:  None
 426 Returns:    Nothing
 427 */
 428
 429 void
 430 exim_nullstd(void)
 431 {
 432 int i;
 433 int devnull = -1;
 434 struct stat statbuf;
 435 for (i = 0; i <= 2; i++)
 436   {
 437   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 438     {
 439     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 440     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 441       string_open_failed(errno, "/dev/null"));
 442     if (devnull != i) (void)dup2(devnull, i);
 443     }
 444   }
 445 if (devnull > 2) (void)close(devnull);
 446 }
 447
 448
 449
 450
 451 /*************************************************
 452 *   Close unwanted file descriptors for delivery *
 453 *************************************************/
 454
 455 /* This function is called from a new process that has been forked to deliver
 456 an incoming message, either directly, or using exec.
 457
 458 We want any smtp input streams to be closed in this new process. However, it
 459 has been observed that using fclose() here causes trouble. When reading in -bS
 460 input, duplicate copies of messages have been seen. The files will be sharing a
 461 file pointer with the parent process, and it seems that fclose() (at least on
 462 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 463 least sometimes. Hence we go for closing the underlying file descriptors.
 464
 465 If TLS is active, we want to shut down the TLS library, but without molesting
 466 the parent's SSL connection.
 467
 468 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 469 stderr unless debugging) because the calling process might have set them up as
 470 pipes and be waiting for them to close before it waits for the submission
 471 process to terminate. If they aren't closed, they hold up the calling process
 472 until the initial delivery process finishes, which is not what we want.
 473
 474 Exception: We do want it for synchronous delivery!
 475
 476 And notwithstanding all the above, if D_resolver is set, implying resolver
 477 debugging, leave stdout open, because that's where the resolver writes its
 478 debugging output.
 479
 480 When we close stderr (which implies we've also closed stdout), we also get rid
 481 of any controlling terminal.
 482
 483 Arguments:   None
 484 Returns:     Nothing
 485 */
 486
 487 static void
 488 close_unwanted(void)
 489 {
 490 if (smtp_input)
 491   {
 492   #ifdef SUPPORT_TLS
 493   tls_close(FALSE);      /* Shut down the TLS library */
 494   #endif
 495   (void)close(fileno(smtp_in));
 496   (void)close(fileno(smtp_out));
 497   smtp_in = NULL;
 498   }
 499 else
 500   {
 501   (void)close(0);                                          /* stdin */
 502   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 503   if (debug_selector == 0)                                 /* stderr */
 504     {
 505     if (!synchronous_delivery)
 506       {
 507       (void)close(2);
 508       log_stderr = NULL;
 509       }
 510     (void)setsid();
 511     }
 512   }
 513 }
 514
 515
 516
 517
 518 /*************************************************
 519 *          Set uid and gid                       *
 520 *************************************************/
 521
 522 /* This function sets a new uid and gid permanently, optionally calling
 523 initgroups() to set auxiliary groups. There are some special cases when running
 524 Exim in unprivileged modes. In these situations the effective uid will not be
 525 root; if we already have the right effective uid/gid, and don't need to
 526 initialize any groups, leave things as they are.
 527
 528 Arguments:
 529   uid        the uid
 530   gid        the gid
 531   igflag     TRUE if initgroups() wanted
 532   msg        text to use in debugging output and failure log
 533
 534 Returns:     nothing; bombs out on failure
 535 */
 536
 537 void
 538 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 539 {
 540 uid_t euid = geteuid();
 541 gid_t egid = getegid();
 542
 543 if (euid == root_uid || euid != uid || egid != gid || igflag)
 544   {
 545   /* At least one OS returns +1 for initgroups failure, so just check for
 546   non-zero. */
 547
 548   if (igflag)
 549     {
 550     struct passwd *pw = getpwuid(uid);
 551     if (pw != NULL)
 552       {
 553       if (initgroups(pw->pw_name, gid) != 0)
 554         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 555           (long int)uid, strerror(errno));
 556       }
 557     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 558       "no passwd entry for uid=%ld", (long int)uid);
 559     }
 560
 561   if (setgid(gid) < 0 || setuid(uid) < 0)
 562     {
 563     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 564       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 565     }
 566   }
 567
 568 /* Debugging output included uid/gid and all groups */
 569
 570 DEBUG(D_uid)
 571   {
 572   int group_count;
 573   gid_t group_list[NGROUPS_MAX];
 574   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 575     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 576   group_count = getgroups(NGROUPS_MAX, group_list);
 577   debug_printf("  auxiliary group list:");
 578   if (group_count > 0)
 579     {
 580     int i;
 581     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 582     }
 583   else debug_printf(" <none>");
 584   debug_printf("\n");
 585   }
 586 }
 587
 588
 589
 590
 591 /*************************************************
 592 *               Exit point                       *
 593 *************************************************/
 594
 595 /* Exim exits via this function so that it always clears up any open
 596 databases.
 597
 598 Arguments:
 599   rc         return code
 600
 601 Returns:     does not return
 602 */
 603
 604 void
 605 exim_exit(int rc)
 606 {
 607 search_tidyup();
 608 DEBUG(D_any)
 609   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 610     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 611 exit(rc);
 612 }
 613
 614
 615
 616
 617 /*************************************************
 618 *         Extract port from host address         *
 619 *************************************************/
 620
 621 /* Called to extract the port from the values given to -oMa and -oMi.
 622 It also checks the syntax of the address, and terminates it before the
 623 port data when a port is extracted.
 624
 625 Argument:
 626   address   the address, with possible port on the end
 627
 628 Returns:    the port, or zero if there isn't one
 629             bombs out on a syntax error
 630 */
 631
 632 static int
 633 check_port(uschar *address)
 634 {
 635 int port = host_address_extract_port(address);
 636 if (string_is_ip_address(address, NULL) == 0)
 637   {
 638   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 639   exit(EXIT_FAILURE);
 640   }
 641 return port;
 642 }
 643
 644
 645
 646 /*************************************************
 647 *              Test/verify an address            *
 648 *************************************************/
 649
 650 /* This function is called by the -bv and -bt code. It extracts a working
 651 address from a full RFC 822 address. This isn't really necessary per se, but it
 652 has the effect of collapsing source routes.
 653
 654 Arguments:
 655   s            the address string
 656   flags        flag bits for verify_address()
 657   exit_value   to be set for failures
 658
 659 Returns:       nothing
 660 */
 661
 662 static void
 663 test_address(uschar *s, int flags, int *exit_value)
 664 {
 665 int start, end, domain;
 666 uschar *parse_error = NULL;
 667 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 668   FALSE);
 669 if (address == NULL)
 670   {
 671   fprintf(stdout, "syntax error: %s\n", parse_error);
 672   *exit_value = 2;
 673   }
 674 else
 675   {
 676   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 677     -1, -1, NULL, NULL, NULL);
 678   if (rc == FAIL) *exit_value = 2;
 679     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 680   }
 681 }
 682
 683
 684
 685 /*************************************************
 686 *         Decode bit settings for log/debug      *
 687 *************************************************/
 688
 689 /* This function decodes a string containing bit settings in the form of +name
 690 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 691 also recognizes a numeric setting of the form =<number>, but this is not
 692 intended for user use. It's an easy way for Exim to pass the debug settings
 693 when it is re-exec'ed.
 694
 695 The log options are held in two unsigned ints (because there became too many
 696 for one). The top bit in the table means "put in 2nd selector". This does not
 697 yet apply to debug options, so the "=" facility sets only the first selector.
 698
 699 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
 700 It sets all the bits in both selectors. However, there is a facility for then
 701 unsetting certain bits, because we want to turn off "memory" in the debug case.
 702
 703 A bad value for a debug setting is treated as an unknown option - error message
 704 to stderr and die. For log settings, which come from the configuration file,
 705 we write to the log on the way out...
 706
 707 Arguments:
 708   selector1      address of the first bit string
 709   selector2      address of the second bit string, or NULL
 710   notall1        bits to exclude from "all" for selector1
 711   notall2        bits to exclude from "all" for selector2
 712   string         the configured string
 713   options        the table of option names
 714   count          size of table
 715   which          "log" or "debug"
 716
 717 Returns:         nothing on success - bomb out on failure
 718 */
 719
 720 static void
 721 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
 722   int notall2, uschar *string, bit_table *options, int count, uschar *which)
 723 {
 724 uschar *errmsg;
 725 if (string == NULL) return;
 726
 727 if (*string == '=')
 728   {
 729   char *end;    /* Not uschar */
 730   *selector1 = strtoul(CS string+1, &end, 0);
 731   if (*end == 0) return;
 732   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 733     string);
 734   goto ERROR_RETURN;
 735   }
 736
 737 /* Handle symbolic setting */
 738
 739 else for(;;)
 740   {
 741   BOOL adding;
 742   uschar *s;
 743   int len;
 744   bit_table *start, *end;
 745
 746   while (isspace(*string)) string++;
 747   if (*string == 0) return;
 748
 749   if (*string != '+' && *string != '-')
 750     {
 751     errmsg = string_sprintf("malformed %s_selector setting: "
 752       "+ or - expected but found \"%s\"", which, string);
 753     goto ERROR_RETURN;
 754     }
 755
 756   adding = *string++ == '+';
 757   s = string;
 758   while (isalnum(*string) || *string == '_') string++;
 759   len = string - s;
 760
 761   start = options;
 762   end = options + count;
 763
 764   while (start < end)
 765     {
 766     bit_table *middle = start + (end - start)/2;
 767     int c = Ustrncmp(s, middle->name, len);
 768     if (c == 0)
 769       {
 770       if (middle->name[len] != 0) c = -1; else
 771         {
 772         unsigned int bit = middle->bit;
 773         unsigned int *selector;
 774
 775         /* The value with all bits set means "force all bits in both selectors"
 776         in the case where two are being handled. However, the top bit in the
 777         second selector is never set. When setting, some bits can be excluded.
 778         */
 779
 780         if (bit == 0xffffffff)
 781           {
 782           if (adding)
 783             {
 784             *selector1 = 0xffffffff ^ notall1;
 785             if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
 786             }
 787           else
 788             {
 789             *selector1 = 0;
 790             if (selector2 != NULL) *selector2 = 0;
 791             }
 792           }
 793
 794         /* Otherwise, the 0x80000000 bit means "this value, without the top
 795         bit, belongs in the second selector". */
 796
 797         else
 798           {
 799           if ((bit & 0x80000000) != 0)
 800             {
 801             selector = selector2;
 802             bit &= 0x7fffffff;
 803             }
 804           else selector = selector1;
 805           if (adding) *selector |= bit; else *selector &= ~bit;
 806           }
 807         break;  /* Out of loop to match selector name */
 808         }
 809       }
 810     if (c < 0) end = middle; else start = middle + 1;
 811     }  /* Loop to match selector name */
 812
 813   if (start >= end)
 814     {
 815     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 816       adding? '+' : '-', len, s);
 817     goto ERROR_RETURN;
 818     }
 819   }    /* Loop for selector names */
 820
 821 /* Handle disasters */
 822
 823 ERROR_RETURN:
 824 if (Ustrcmp(which, "debug") == 0)
 825   {
 826   fprintf(stderr, "exim: %s\n", errmsg);
 827   exit(EXIT_FAILURE);
 828   }
 829 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 830 }
 831
 832
 833
 834 /*************************************************
 835 *          Show supported features               *
 836 *************************************************/
 837
 838 /* This function is called for -bV and for -d to output the optional features
 839 of the current Exim binary.
 840
 841 Arguments:  a FILE for printing
 842 Returns:    nothing
 843 */
 844
 845 static void
 846 show_whats_supported(FILE *f)
 847 {
 848 #ifdef DB_VERSION_STRING
 849 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 850 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 851   #ifdef USE_DB
 852   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 853   #else
 854   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 855   #endif
 856 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 857 fprintf(f, "Probably ndbm\n");
 858 #elif defined(USE_TDB)
 859 fprintf(f, "Using tdb\n");
 860 #else
 861   #ifdef USE_GDBM
 862   fprintf(f, "Probably GDBM (native mode)\n");
 863   #else
 864   fprintf(f, "Probably GDBM (compatibility mode)\n");
 865   #endif
 866 #endif
 867
 868 fprintf(f, "Support for:");
 869 #ifdef SUPPORT_CRYPTEQ
 870   fprintf(f, " crypteq");
 871 #endif
 872 #if HAVE_ICONV
 873   fprintf(f, " iconv()");
 874 #endif
 875 #if HAVE_IPV6
 876   fprintf(f, " IPv6");
 877 #endif
 878 #ifdef HAVE_LOGIN_CAP
 879   fprintf(f, " use_classresources");
 880 #endif
 881 #ifdef SUPPORT_PAM
 882   fprintf(f, " PAM");
 883 #endif
 884 #ifdef EXIM_PERL
 885   fprintf(f, " Perl");
 886 #endif
 887 #ifdef EXPAND_DLFUNC
 888   fprintf(f, " Expand_dlfunc");
 889 #endif
 890 #ifdef USE_TCP_WRAPPERS
 891   fprintf(f, " TCPwrappers");
 892 #endif
 893 #ifdef SUPPORT_TLS
 894   #ifdef USE_GNUTLS
 895   fprintf(f, " GnuTLS");
 896   #else
 897   fprintf(f, " OpenSSL");
 898   #endif
 899 #endif
 900 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 901   fprintf(f, " translate_ip_address");
 902 #endif
 903 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 904   fprintf(f, " move_frozen_messages");
 905 #endif
 906 #ifdef WITH_CONTENT_SCAN
 907   fprintf(f, " Content_Scanning");
 908 #endif
 909 #ifdef WITH_OLD_DEMIME
 910   fprintf(f, " Old_Demime");
 911 #endif
 912 #ifdef EXPERIMENTAL_SPF
 913   fprintf(f, " Experimental_SPF");
 914 #endif
 915 #ifdef EXPERIMENTAL_SRS
 916   fprintf(f, " Experimental_SRS");
 917 #endif
 918 #ifdef EXPERIMENTAL_BRIGHTMAIL
 919   fprintf(f, " Experimental_Brightmail");
 920 #endif
 921 #ifdef EXPERIMENTAL_DOMAINKEYS
 922   fprintf(f, " Experimental_DomainKeys");
 923 #endif
 924 fprintf(f, "\n");
 925
 926 fprintf(f, "Lookups:");
 927 #ifdef LOOKUP_LSEARCH
 928   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 929 #endif
 930 #ifdef LOOKUP_CDB
 931   fprintf(f, " cdb");
 932 #endif
 933 #ifdef LOOKUP_DBM
 934   fprintf(f, " dbm dbmnz");
 935 #endif
 936 #ifdef LOOKUP_DNSDB
 937   fprintf(f, " dnsdb");
 938 #endif
 939 #ifdef LOOKUP_DSEARCH
 940   fprintf(f, " dsearch");
 941 #endif
 942 #ifdef LOOKUP_IBASE
 943   fprintf(f, " ibase");
 944 #endif
 945 #ifdef LOOKUP_LDAP
 946   fprintf(f, " ldap ldapdn ldapm");
 947 #endif
 948 #ifdef LOOKUP_MYSQL
 949   fprintf(f, " mysql");
 950 #endif
 951 #ifdef LOOKUP_NIS
 952   fprintf(f, " nis nis0");
 953 #endif
 954 #ifdef LOOKUP_NISPLUS
 955   fprintf(f, " nisplus");
 956 #endif
 957 #ifdef LOOKUP_ORACLE
 958   fprintf(f, " oracle");
 959 #endif
 960 #ifdef LOOKUP_PASSWD
 961   fprintf(f, " passwd");
 962 #endif
 963 #ifdef LOOKUP_PGSQL
 964   fprintf(f, " pgsql");
 965 #endif
 966 #ifdef LOOKUP_SQLITE
 967   fprintf(f, " sqlite");
 968 #endif
 969 #ifdef LOOKUP_TESTDB
 970   fprintf(f, " testdb");
 971 #endif
 972 #ifdef LOOKUP_WHOSON
 973   fprintf(f, " whoson");
 974 #endif
 975 fprintf(f, "\n");
 976
 977 fprintf(f, "Authenticators:");
 978 #ifdef AUTH_CRAM_MD5
 979   fprintf(f, " cram_md5");
 980 #endif
 981 #ifdef AUTH_CYRUS_SASL
 982   fprintf(f, " cyrus_sasl");
 983 #endif
 984 #ifdef AUTH_PLAINTEXT
 985   fprintf(f, " plaintext");
 986 #endif
 987 #ifdef AUTH_SPA
 988   fprintf(f, " spa");
 989 #endif
 990 fprintf(f, "\n");
 991
 992 fprintf(f, "Routers:");
 993 #ifdef ROUTER_ACCEPT
 994   fprintf(f, " accept");
 995 #endif
 996 #ifdef ROUTER_DNSLOOKUP
 997   fprintf(f, " dnslookup");
 998 #endif
 999 #ifdef ROUTER_IPLITERAL
1000   fprintf(f, " ipliteral");
1001 #endif
1002 #ifdef ROUTER_IPLOOKUP
1003   fprintf(f, " iplookup");
1004 #endif
1005 #ifdef ROUTER_MANUALROUTE
1006   fprintf(f, " manualroute");
1007 #endif
1008 #ifdef ROUTER_QUERYPROGRAM
1009   fprintf(f, " queryprogram");
1010 #endif
1011 #ifdef ROUTER_REDIRECT
1012   fprintf(f, " redirect");
1013 #endif
1014 fprintf(f, "\n");
1015
1016 fprintf(f, "Transports:");
1017 #ifdef TRANSPORT_APPENDFILE
1018   fprintf(f, " appendfile");
1019   #ifdef SUPPORT_MAILDIR
1020     fprintf(f, "/maildir");
1021   #endif
1022   #ifdef SUPPORT_MAILSTORE
1023     fprintf(f, "/mailstore");
1024   #endif
1025   #ifdef SUPPORT_MBX
1026     fprintf(f, "/mbx");
1027   #endif
1028 #endif
1029 #ifdef TRANSPORT_AUTOREPLY
1030   fprintf(f, " autoreply");
1031 #endif
1032 #ifdef TRANSPORT_LMTP
1033   fprintf(f, " lmtp");
1034 #endif
1035 #ifdef TRANSPORT_PIPE
1036   fprintf(f, " pipe");
1037 #endif
1038 #ifdef TRANSPORT_SMTP
1039   fprintf(f, " smtp");
1040 #endif
1041 fprintf(f, "\n");
1042
1043 if (fixed_never_users[0] > 0)
1044   {
1045   int i;
1046   fprintf(f, "Fixed never_users: ");
1047   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1048     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1049   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1050   }
1051
1052 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1053 }
1054
1055
1056
1057
1058 /*************************************************
1059 *               Quote a local part               *
1060 *************************************************/
1061
1062 /* This function is used when a sender address or a From: or Sender: header
1063 line is being created from the caller's login, or from an authenticated_id. It
1064 applies appropriate quoting rules for a local part.
1065
1066 Argument:    the local part
1067 Returns:     the local part, quoted if necessary
1068 */
1069
1070 uschar *
1071 local_part_quote(uschar *lpart)
1072 {
1073 BOOL needs_quote = FALSE;
1074 int size, ptr;
1075 uschar *yield;
1076 uschar *t;
1077
1078 for (t = lpart; !needs_quote && *t != 0; t++)
1079   {
1080   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1081     (*t != '.' || t == lpart || t[1] == 0);
1082   }
1083
1084 if (!needs_quote) return lpart;
1085
1086 size = ptr = 0;
1087 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1088
1089 for (;;)
1090   {
1091   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1092   if (nq == NULL)
1093     {
1094     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1095     break;
1096     }
1097   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1098   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1099   yield = string_cat(yield, &size, &ptr, nq, 1);
1100   lpart = nq + 1;
1101   }
1102
1103 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1104 yield[ptr] = 0;
1105 return yield;
1106 }
1107
1108
1109
1110 #ifdef USE_READLINE
1111 /*************************************************
1112 *         Load readline() functions              *
1113 *************************************************/
1114
1115 /* This function is called from testing executions that read data from stdin,
1116 but only when running as the calling user. Currently, only -be does this. The
1117 function loads the readline() function library and passes back the functions.
1118 On some systems, it needs the curses library, so load that too, but try without
1119 it if loading fails. All this functionality has to be requested at build time.
1120
1121 Arguments:
1122   fn_readline_ptr   pointer to where to put the readline pointer
1123   fn_addhist_ptr    pointer to where to put the addhistory function
1124
1125 Returns:            the dlopen handle or NULL on failure
1126 */
1127
1128 static void *
1129 set_readline(char * (**fn_readline_ptr)(char *),
1130              char * (**fn_addhist_ptr)(char *))
1131 {
1132 void *dlhandle;
1133 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1134
1135 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1136 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1137
1138 if (dlhandle != NULL)
1139   {
1140   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1141   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1142   }
1143 else
1144   {
1145   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1146   }
1147
1148 return dlhandle;
1149 }
1150 #endif
1151
1152
1153
1154 /*************************************************
1155 *    Get a line from stdin for testing things    *
1156 *************************************************/
1157
1158 /* This function is called when running tests that can take a number of lines
1159 of input (for example, -be and -bt). It handles continuations and trailing
1160 spaces. And prompting and a blank line output on eof. If readline() is in use,
1161 the arguments are non-NULL and provide the relevant functions.
1162
1163 Arguments:
1164   fn_readline   readline function or NULL
1165   fn_addhist    addhist function or NULL
1166
1167 Returns:        pointer to dynamic memory, or NULL at end of file
1168 */
1169
1170 static uschar *
1171 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1172 {
1173 int i;
1174 int size = 0;
1175 int ptr = 0;
1176 uschar *yield = NULL;
1177
1178 if (fn_readline == NULL) printf("> ");
1179
1180 for (i = 0;; i++)
1181   {
1182   uschar buffer[1024];
1183   uschar *p, *ss;
1184
1185   #ifdef USE_READLINE
1186   char *readline_line = NULL;
1187   if (fn_readline != NULL)
1188     {
1189     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1190     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1191     p = US readline_line;
1192     }
1193   else
1194   #endif
1195
1196   /* readline() not in use */
1197
1198     {
1199     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1200     p = buffer;
1201     }
1202
1203   /* Handle the line */
1204
1205   ss = p + (int)Ustrlen(p);
1206   while (ss > p && isspace(ss[-1])) ss--;
1207
1208   if (i > 0)
1209     {
1210     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1211     }
1212
1213   yield = string_cat(yield, &size, &ptr, p, ss - p);
1214
1215   #ifdef USE_READLINE
1216   if (fn_readline != NULL) free(readline_line);
1217   #endif
1218
1219   if (ss == p || yield[ptr-1] != '\\')
1220     {
1221     yield[ptr] = 0;
1222     break;
1223     }
1224   yield[--ptr] = 0;
1225   }
1226
1227 if (yield == NULL) printf("\n");
1228 return yield;
1229 }
1230
1231
1232
1233 /*************************************************
1234 *          Entry point and high-level code       *
1235 *************************************************/
1236
1237 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1238 the appropriate action. All the necessary functions are present in the one
1239 binary. I originally thought one should split it up, but it turns out that so
1240 much of the apparatus is needed in each chunk that one might as well just have
1241 it all available all the time, which then makes the coding easier as well.
1242
1243 Arguments:
1244   argc      count of entries in argv
1245   argv      argument strings, with argv[0] being the program name
1246
1247 Returns:    EXIT_SUCCESS if terminated successfully
1248             EXIT_FAILURE otherwise, except when a message has been sent
1249               to the sender, and -oee was given
1250 */
1251
1252 int
1253 main(int argc, char **cargv)
1254 {
1255 uschar **argv = USS cargv;
1256 int  arg_receive_timeout = -1;
1257 int  arg_smtp_receive_timeout = -1;
1258 int  arg_error_handling = error_handling;
1259 int  filter_sfd = -1;
1260 int  filter_ufd = -1;
1261 int  group_count;
1262 int  i;
1263 int  list_queue_option = 0;
1264 int  msg_action = 0;
1265 int  msg_action_arg = -1;
1266 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1267 int  queue_only_reason = 0;
1268 #ifdef EXIM_PERL
1269 int  perl_start_option = 0;
1270 #endif
1271 int  recipients_arg = argc;
1272 int  sender_address_domain = 0;
1273 int  test_retry_arg = -1;
1274 int  test_rewrite_arg = -1;
1275 BOOL arg_queue_only = FALSE;
1276 BOOL bi_option = FALSE;
1277 BOOL checking = FALSE;
1278 BOOL count_queue = FALSE;
1279 BOOL expansion_test = FALSE;
1280 BOOL extract_recipients = FALSE;
1281 BOOL forced_delivery = FALSE;
1282 BOOL f_end_dot = FALSE;
1283 BOOL deliver_give_up = FALSE;
1284 BOOL list_queue = FALSE;
1285 BOOL list_options = FALSE;
1286 BOOL local_queue_only;
1287 BOOL more = TRUE;
1288 BOOL one_msg_action = FALSE;
1289 BOOL queue_only_set = FALSE;
1290 BOOL receiving_message = TRUE;
1291 BOOL unprivileged;
1292 BOOL removed_privilege = FALSE;
1293 BOOL verify_address_mode = FALSE;
1294 BOOL verify_as_sender = FALSE;
1295 BOOL version_printed = FALSE;
1296 uschar *alias_arg = NULL;
1297 uschar *called_as = US"";
1298 uschar *start_queue_run_id = NULL;
1299 uschar *stop_queue_run_id = NULL;
1300 uschar *ftest_domain = NULL;
1301 uschar *ftest_localpart = NULL;
1302 uschar *ftest_prefix = NULL;
1303 uschar *ftest_suffix = NULL;
1304 uschar *real_sender_address;
1305 uschar *originator_home = US"/";
1306 void *reset_point;
1307
1308 struct passwd *pw;
1309 struct stat statbuf;
1310 pid_t passed_qr_pid = (pid_t)0;
1311 int passed_qr_pipe = -1;
1312 gid_t group_list[NGROUPS_MAX];
1313
1314 /* Possible options for -R and -S */
1315
1316 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1317
1318 /* Need to define this in case we need to change the environment in order
1319 to get rid of a bogus time zone. We have to make it char rather than uschar
1320 because some OS define it in /usr/include/unistd.h. */
1321
1322 extern char **environ;
1323
1324 /* If the Exim user and/or group and/or the configuration file owner/group were
1325 defined by ref:name at build time, we must now find the actual uid/gid values.
1326 This is a feature to make the lives of binary distributors easier. */
1327
1328 #ifdef EXIM_USERNAME
1329 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1330   {
1331   exim_gid = pw->pw_gid;
1332   }
1333 else
1334   {
1335   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1336     EXIM_USERNAME);
1337   exit(EXIT_FAILURE);
1338   }
1339 #endif
1340
1341 #ifdef EXIM_GROUPNAME
1342 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1343   {
1344   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1345     EXIM_GROUPNAME);
1346   exit(EXIT_FAILURE);
1347   }
1348 #endif
1349
1350 #ifdef CONFIGURE_OWNERNAME
1351 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1352   {
1353   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1354     CONFIGURE_OWNERNAME);
1355   exit(EXIT_FAILURE);
1356   }
1357 #endif
1358
1359 #ifdef CONFIGURE_GROUPNAME
1360 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1361   {
1362   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1363     CONFIGURE_GROUPNAME);
1364   exit(EXIT_FAILURE);
1365   }
1366 #endif
1367
1368 /* In the Cygwin environment, some initialization needs doing. It is fudged
1369 in by means of this macro. */
1370
1371 #ifdef OS_INIT
1372 OS_INIT
1373 #endif
1374
1375 /* Check a field which is patched when we are running Exim within its
1376 testing harness; do a fast initial check, and then the whole thing. */
1377
1378 running_in_test_harness =
1379   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1380
1381 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1382 at the start of a program; however, it seems that some environments do not
1383 follow this. A "strange" locale can affect the formatting of timestamps, so we
1384 make quite sure. */
1385
1386 setlocale(LC_ALL, "C");
1387
1388 /* Set up the default handler for timing using alarm(). */
1389
1390 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1391
1392 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1393 because store_malloc writes a log entry on failure. */
1394
1395 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1396 if (log_buffer == NULL)
1397   {
1398   fprintf(stderr, "exim: failed to get store for log buffer\n");
1399   exit(EXIT_FAILURE);
1400   }
1401
1402 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1403 NULL when the daemon is run and the file is closed. We have to use this
1404 indirection, because some systems don't allow writing to the variable "stderr".
1405 */
1406
1407 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1408
1409 /* Arrange for the PCRE regex library to use our store functions. Note that
1410 the normal calls are actually macros that add additional arguments for
1411 debugging purposes so we have to assign specially constructed functions here.
1412 The default is to use store in the stacking pool, but this is overridden in the
1413 regex_must_compile() function. */
1414
1415 pcre_malloc = function_store_get;
1416 pcre_free = function_dummy_free;
1417
1418 /* Ensure there is a big buffer for temporary use in several places. It is put
1419 in malloc store so that it can be freed for enlargement if necessary. */
1420
1421 big_buffer = store_malloc(big_buffer_size);
1422
1423 /* Set up the handler for the data request signal, and set the initial
1424 descriptive text. */
1425
1426 set_process_info("initializing");
1427 os_restarting_signal(SIGUSR1, usr1_handler);
1428
1429 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1430 in the daemon code. For the rest of Exim's uses, we ignore it. */
1431
1432 signal(SIGHUP, SIG_IGN);
1433
1434 /* We don't want to die on pipe errors as the code is written to handle
1435 the write error instead. */
1436
1437 signal(SIGPIPE, SIG_IGN);
1438
1439 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1440 set to SIG_IGN. This causes subprocesses that complete before the parent
1441 process waits for them not to hang around, so when Exim calls wait(), nothing
1442 is there. The wait() code has been made robust against this, but let's ensure
1443 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1444 ending status. We use sigaction rather than plain signal() on those OS where
1445 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1446 problem on AIX with this.) */
1447
1448 #ifdef SA_NOCLDWAIT
1449   {
1450   struct sigaction act;
1451   act.sa_handler = SIG_DFL;
1452   sigemptyset(&(act.sa_mask));
1453   act.sa_flags = 0;
1454   sigaction(SIGCHLD, &act, NULL);
1455   }
1456 #else
1457 signal(SIGCHLD, SIG_DFL);
1458 #endif
1459
1460 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1461 SIGHUP. */
1462
1463 sighup_argv = argv;
1464
1465 /* Set up the version number. Set up the leading 'E' for the external form of
1466 message ids, set the pointer to the internal form, and initialize it to
1467 indicate no message being processed. */
1468
1469 version_init();
1470 message_id_option[0] = '-';
1471 message_id_external = message_id_option + 1;
1472 message_id_external[0] = 'E';
1473 message_id = message_id_external + 1;
1474 message_id[0] = 0;
1475
1476 /* Set the umask to zero so that any files that Exim creates using open() are
1477 created with the modes that it specifies. NOTE: Files created with fopen() have
1478 a problem, which was not recognized till rather late (February 2006). With this
1479 umask, such files will be world writeable. (They are all content scanning files
1480 in the spool directory, which isn't world-accessible, so this is not a
1481 disaster, but it's untidy.) I don't want to change this overall setting,
1482 however, because it will interact badly with the open() calls. Instead, there's
1483 now a function called modefopen() that fiddles with the umask while calling
1484 fopen(). */
1485
1486 umask(0);
1487
1488 /* Precompile the regular expression for matching a message id. Keep this in
1489 step with the code that generates ids in the accept.c module. We need to do
1490 this here, because the -M options check their arguments for syntactic validity
1491 using mac_ismsgid, which uses this. */
1492
1493 regex_ismsgid =
1494   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1495
1496 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1497 this seems to be a generally accepted convention, since one finds symbolic
1498 links called "mailq" in standard OS configurations. */
1499
1500 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1501     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1502   {
1503   list_queue = TRUE;
1504   receiving_message = FALSE;
1505   called_as = US"-mailq";
1506   }
1507
1508 /* If the program is called as "rmail" treat it as equivalent to
1509 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1510 i.e. preventing a single dot on a line from terminating the message, and
1511 returning with zero return code, even in cases of error (provided an error
1512 message has been sent). */
1513
1514 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1515     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1516   {
1517   dot_ends = FALSE;
1518   called_as = US"-rmail";
1519   errors_sender_rc = EXIT_SUCCESS;
1520   }
1521
1522 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1523 this is a smail convention. */
1524
1525 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1526     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1527   {
1528   smtp_input = smtp_batched_input = TRUE;
1529   called_as = US"-rsmtp";
1530   }
1531
1532 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1533 this is a smail convention. */
1534
1535 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1536     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1537   {
1538   queue_interval = 0;
1539   receiving_message = FALSE;
1540   called_as = US"-runq";
1541   }
1542
1543 /* If the program is called as "newaliases" treat it as equivalent to
1544 "exim -bi"; this is a sendmail convention. */
1545
1546 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1547     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1548   {
1549   bi_option = TRUE;
1550   receiving_message = FALSE;
1551   called_as = US"-newaliases";
1552   }
1553
1554 /* Save the original effective uid for a couple of uses later. It should
1555 normally be root, but in some esoteric environments it may not be. */
1556
1557 original_euid = geteuid();
1558
1559 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1560 to be the same as the real ones. This makes a difference only if Exim is setuid
1561 (or setgid) to something other than root, which could be the case in some
1562 special configurations. */
1563
1564 real_uid = getuid();
1565 real_gid = getgid();
1566
1567 if (real_uid == root_uid)
1568   {
1569   setgid(real_gid);
1570   setuid(real_uid);
1571   }
1572
1573 /* If neither the original real uid nor the original euid was root, Exim is
1574 running in an unprivileged state. */
1575
1576 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1577
1578 /* If the first argument is --help, pretend there are no arguments. This will
1579 cause a brief message to be given. */
1580
1581 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1582
1583 /* Scan the program's arguments. Some can be dealt with right away; others are
1584 simply recorded for checking and handling afterwards. Do a high-level switch
1585 on the second character (the one after '-'), to save some effort. */
1586
1587 for (i = 1; i < argc; i++)
1588   {
1589   BOOL badarg = FALSE;
1590   uschar *arg = argv[i];
1591   uschar *argrest;
1592   int switchchar;
1593
1594   /* An argument not starting with '-' is the start of a recipients list;
1595   break out of the options-scanning loop. */
1596
1597   if (arg[0] != '-')
1598     {
1599     recipients_arg = i;
1600     break;
1601     }
1602
1603   /* An option consistion of -- terminates the options */
1604
1605   if (Ustrcmp(arg, "--") == 0)
1606     {
1607     recipients_arg = i + 1;
1608     break;
1609     }
1610
1611   /* Handle flagged options */
1612
1613   switchchar = arg[1];
1614   argrest = arg+2;
1615
1616   /* Make all -ex options synonymous with -oex arguments, since that
1617   is assumed by various callers. Also make -qR options synonymous with -R
1618   options, as that seems to be required as well. Allow for -qqR too, and
1619   the same for -S options. */
1620
1621   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1622       Ustrncmp(arg+1, "qR", 2) == 0 ||
1623       Ustrncmp(arg+1, "qS", 2) == 0)
1624     {
1625     switchchar = arg[2];
1626     argrest++;
1627     }
1628   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1629     {
1630     switchchar = arg[3];
1631     argrest += 2;
1632     queue_2stage = TRUE;
1633     }
1634
1635   /* Make -r synonymous with -f, since it is a documented alias */
1636
1637   else if (arg[1] == 'r') switchchar = 'f';
1638
1639   /* Make -ov synonymous with -v */
1640
1641   else if (Ustrcmp(arg, "-ov") == 0)
1642     {
1643     switchchar = 'v';
1644     argrest++;
1645     }
1646
1647   /* High-level switch on active initial letter */
1648
1649   switch(switchchar)
1650     {
1651     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1652     so has no need of it. */
1653
1654     case 'B':
1655     if (*argrest == 0) i++;       /* Skip over the type */
1656     break;
1657
1658
1659     case 'b':
1660     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1661
1662     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1663        -bdf: Ditto, but in the foreground.
1664     */
1665
1666     if (*argrest == 'd')
1667       {
1668       daemon_listen = TRUE;
1669       if (*(++argrest) == 'f') background_daemon = FALSE;
1670         else if (*argrest != 0) { badarg = TRUE; break; }
1671       }
1672
1673     /* -be: Run in expansion test mode */
1674
1675     else if (*argrest == 'e')
1676       expansion_test = checking = TRUE;
1677
1678     /* -bF:  Run system filter test */
1679
1680     else if (*argrest == 'F')
1681       {
1682       filter_test |= FTEST_SYSTEM;
1683       if (*(++argrest) != 0) { badarg = TRUE; break; }
1684       if (++i < argc) filter_test_sfile = argv[i]; else
1685         {
1686         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1687         exit(EXIT_FAILURE);
1688         }
1689       }
1690
1691     /* -bf:  Run user filter test
1692        -bfd: Set domain for filter testing
1693        -bfl: Set local part for filter testing
1694        -bfp: Set prefix for filter testing
1695        -bfs: Set suffix for filter testing
1696     */
1697
1698     else if (*argrest == 'f')
1699       {
1700       if (*(++argrest) == 0)
1701         {
1702         filter_test |= FTEST_USER;
1703         if (++i < argc) filter_test_ufile = argv[i]; else
1704           {
1705           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1706           exit(EXIT_FAILURE);
1707           }
1708         }
1709       else
1710         {
1711         if (++i >= argc)
1712           {
1713           fprintf(stderr, "exim: string expected after %s\n", arg);
1714           exit(EXIT_FAILURE);
1715           }
1716         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1717         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1718         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1719         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1720         else { badarg = TRUE; break; }
1721         }
1722       }
1723
1724     /* -bh: Host checking - an IP address must follow. */
1725
1726     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1727       {
1728       if (++i >= argc) { badarg = TRUE; break; }
1729       sender_host_address = argv[i];
1730       host_checking = checking = log_testing_mode = TRUE;
1731       host_checking_callout = argrest[1] == 'c';
1732       }
1733
1734     /* -bi: This option is used by sendmail to initialize *the* alias file,
1735     though it has the -oA option to specify a different file. Exim has no
1736     concept of *the* alias file, but since Sun's YP make script calls
1737     sendmail this way, some support must be provided. */
1738
1739     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1740
1741     /* -bm: Accept and deliver message - the default option. Reinstate
1742     receiving_message, which got turned off for all -b options. */
1743
1744     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1745
1746     /* -bnq: For locally originating messages, do not qualify unqualified
1747     addresses. In the envelope, this causes errors; in header lines they
1748     just get left. */
1749
1750     else if (Ustrcmp(argrest, "nq") == 0)
1751       {
1752       allow_unqualified_sender = FALSE;
1753       allow_unqualified_recipient = FALSE;
1754       }
1755
1756     /* -bpxx: List the contents of the mail queue, in various forms. If
1757     the option is -bpc, just a queue count is needed. Otherwise, if the
1758     first letter after p is r, then order is random. */
1759
1760     else if (*argrest == 'p')
1761       {
1762       if (*(++argrest) == 'c')
1763         {
1764         count_queue = TRUE;
1765         if (*(++argrest) != 0) badarg = TRUE;
1766         break;
1767         }
1768
1769       if (*argrest == 'r')
1770         {
1771         list_queue_option = 8;
1772         argrest++;
1773         }
1774       else list_queue_option = 0;
1775
1776       list_queue = TRUE;
1777
1778       /* -bp: List the contents of the mail queue, top-level only */
1779
1780       if (*argrest == 0) {}
1781
1782       /* -bpu: List the contents of the mail queue, top-level undelivered */
1783
1784       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1785
1786       /* -bpa: List the contents of the mail queue, including all delivered */
1787
1788       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1789
1790       /* Unknown after -bp[r] */
1791
1792       else
1793         {
1794         badarg = TRUE;
1795         break;
1796         }
1797       }
1798
1799
1800     /* -bP: List the configuration variables given as the address list.
1801     Force -v, so configuration errors get displayed. */
1802
1803     else if (Ustrcmp(argrest, "P") == 0)
1804       {
1805       list_options = TRUE;
1806       debug_selector |= D_v;
1807       debug_file = stderr;
1808       }
1809
1810     /* -brt: Test retry configuration lookup */
1811
1812     else if (Ustrcmp(argrest, "rt") == 0)
1813       {
1814       test_retry_arg = i + 1;
1815       goto END_ARG;
1816       }
1817
1818     /* -brw: Test rewrite configuration */
1819
1820     else if (Ustrcmp(argrest, "rw") == 0)
1821       {
1822       test_rewrite_arg = i + 1;
1823       goto END_ARG;
1824       }
1825
1826     /* -bS: Read SMTP commands on standard input, but produce no replies -
1827     all errors are reported by sending messages. */
1828
1829     else if (Ustrcmp(argrest, "S") == 0)
1830       smtp_input = smtp_batched_input = receiving_message = TRUE;
1831
1832     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1833     on standard output. */
1834
1835     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1836
1837     /* -bt: address testing mode */
1838
1839     else if (Ustrcmp(argrest, "t") == 0)
1840       address_test_mode = checking = log_testing_mode = TRUE;
1841
1842     /* -bv: verify addresses */
1843
1844     else if (Ustrcmp(argrest, "v") == 0)
1845       verify_address_mode = checking = log_testing_mode = TRUE;
1846
1847     /* -bvs: verify sender addresses */
1848
1849     else if (Ustrcmp(argrest, "vs") == 0)
1850       {
1851       verify_address_mode = checking = log_testing_mode = TRUE;
1852       verify_as_sender = TRUE;
1853       }
1854
1855     /* -bV: Print version string and support details */
1856
1857     else if (Ustrcmp(argrest, "V") == 0)
1858       {
1859       printf("Exim version %s #%s built %s\n", version_string,
1860         version_cnumber, version_date);
1861       printf("%s\n", CS version_copyright);
1862       version_printed = TRUE;
1863       show_whats_supported(stdout);
1864       }
1865
1866     else badarg = TRUE;
1867     break;
1868
1869
1870     /* -C: change configuration file list; ignore if it isn't really
1871     a change! Enforce a prefix check if required. */
1872
1873     case 'C':
1874     if (*argrest == 0)
1875       {
1876       if(++i < argc) argrest = argv[i]; else
1877         { badarg = TRUE; break; }
1878       }
1879     if (Ustrcmp(config_main_filelist, argrest) != 0)
1880       {
1881       #ifdef ALT_CONFIG_PREFIX
1882       int sep = 0;
1883       int len = Ustrlen(ALT_CONFIG_PREFIX);
1884       uschar *list = argrest;
1885       uschar *filename;
1886       while((filename = string_nextinlist(&list, &sep, big_buffer,
1887              big_buffer_size)) != NULL)
1888         {
1889         if ((Ustrlen(filename) < len ||
1890              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1891              Ustrstr(filename, "/../") != NULL) &&
1892              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1893           {
1894           fprintf(stderr, "-C Permission denied\n");
1895           exit(EXIT_FAILURE);
1896           }
1897         }
1898       #endif
1899
1900       config_main_filelist = argrest;
1901       config_changed = TRUE;
1902       }
1903     break;
1904
1905
1906     /* -D: set up a macro definition */
1907
1908     case 'D':
1909     #ifdef DISABLE_D_OPTION
1910     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1911     exit(EXIT_FAILURE);
1912     #else
1913       {
1914       int ptr = 0;
1915       macro_item *mlast = NULL;
1916       macro_item *m;
1917       uschar name[24];
1918       uschar *s = argrest;
1919
1920       while (isspace(*s)) s++;
1921
1922       if (*s < 'A' || *s > 'Z')
1923         {
1924         fprintf(stderr, "exim: macro name set by -D must start with "
1925           "an upper case letter\n");
1926         exit(EXIT_FAILURE);
1927         }
1928
1929       while (isalnum(*s) || *s == '_')
1930         {
1931         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1932         s++;
1933         }
1934       name[ptr] = 0;
1935       if (ptr == 0) { badarg = TRUE; break; }
1936       while (isspace(*s)) s++;
1937       if (*s != 0)
1938         {
1939         if (*s++ != '=') { badarg = TRUE; break; }
1940         while (isspace(*s)) s++;
1941         }
1942
1943       for (m = macros; m != NULL; m = m->next)
1944         {
1945         if (Ustrcmp(m->name, name) == 0)
1946           {
1947           fprintf(stderr, "exim: duplicated -D in command line\n");
1948           exit(EXIT_FAILURE);
1949           }
1950         mlast = m;
1951         }
1952
1953       m = store_get(sizeof(macro_item) + Ustrlen(name));
1954       m->next = NULL;
1955       m->command_line = TRUE;
1956       if (mlast == NULL) macros = m; else mlast->next = m;
1957       Ustrcpy(m->name, name);
1958       m->replacement = string_copy(s);
1959
1960       if (clmacro_count >= MAX_CLMACROS)
1961         {
1962         fprintf(stderr, "exim: too many -D options on command line\n");
1963         exit(EXIT_FAILURE);
1964         }
1965       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1966         m->replacement);
1967       }
1968     #endif
1969     break;
1970
1971     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1972     The latter is now a no-op, retained for compatibility only. If -dd is used,
1973     debugging subprocesses of the daemon is disabled. */
1974
1975     case 'd':
1976     if (Ustrcmp(argrest, "ropcr") == 0)
1977       {
1978       /* drop_cr = TRUE; */
1979       }
1980
1981     /* Use an intermediate variable so that we don't set debugging while
1982     decoding the debugging bits. */
1983
1984     else
1985       {
1986       unsigned int selector = D_default;
1987       debug_selector = 0;
1988       debug_file = NULL;
1989       if (*argrest == 'd')
1990         {
1991         debug_daemon = TRUE;
1992         argrest++;
1993         }
1994       if (*argrest != 0)
1995         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1996           debug_options_count, US"debug");
1997       debug_selector = selector;
1998       }
1999     break;
2000
2001
2002     /* -E: This is a local error message. This option is not intended for
2003     external use at all, but is not restricted to trusted callers because it
2004     does no harm (just suppresses certain error messages) and if Exim is run
2005     not setuid root it won't always be trusted when it generates error
2006     messages using this option. If there is a message id following -E, point
2007     message_reference at it, for logging. */
2008
2009     case 'E':
2010     local_error_message = TRUE;
2011     if (mac_ismsgid(argrest)) message_reference = argrest;
2012     break;
2013
2014
2015     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2016     option, so it looks as if historically the -oex options are also callable
2017     without the leading -o. So we have to accept them. Before the switch,
2018     anything starting -oe has been converted to -e. Exim does not support all
2019     of the sendmail error options. */
2020
2021     case 'e':
2022     if (Ustrcmp(argrest, "e") == 0)
2023       {
2024       arg_error_handling = ERRORS_SENDER;
2025       errors_sender_rc = EXIT_SUCCESS;
2026       }
2027     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2028     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2029     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2030     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2031     else badarg = TRUE;
2032     break;
2033
2034
2035     /* -F: Set sender's full name, used instead of the gecos entry from
2036     the password file. Since users can usually alter their gecos entries,
2037     there's no security involved in using this instead. The data can follow
2038     the -F or be in the next argument. */
2039
2040     case 'F':
2041     if (*argrest == 0)
2042       {
2043       if(++i < argc) argrest = argv[i]; else
2044         { badarg = TRUE; break; }
2045       }
2046     originator_name = argrest;
2047     sender_name_forced = TRUE;
2048     break;
2049
2050
2051     /* -f: Set sender's address - this value is only actually used if Exim is
2052     run by a trusted user, or if untrusted_set_sender is set and matches the
2053     address, except that the null address can always be set by any user. The
2054     test for this happens later, when the value given here is ignored when not
2055     permitted. For an untrusted user, the actual sender is still put in Sender:
2056     if it doesn't match the From: header (unless no_local_from_check is set).
2057     The data can follow the -f or be in the next argument. The -r switch is an
2058     obsolete form of -f but since there appear to be programs out there that
2059     use anything that sendmail has ever supported, better accept it - the
2060     synonymizing is done before the switch above.
2061
2062     At this stage, we must allow domain literal addresses, because we don't
2063     know what the setting of allow_domain_literals is yet. Ditto for trailing
2064     dots and strip_trailing_dot. */
2065
2066     case 'f':
2067       {
2068       int start, end;
2069       uschar *errmess;
2070       if (*argrest == 0)
2071         {
2072         if (i+1 < argc) argrest = argv[++i]; else
2073           { badarg = TRUE; break; }
2074         }
2075       if (*argrest == 0)
2076         {
2077         sender_address = string_sprintf("");  /* Ensure writeable memory */
2078         }
2079       else
2080         {
2081         uschar *temp = argrest + Ustrlen(argrest) - 1;
2082         while (temp >= argrest && isspace(*temp)) temp--;
2083         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2084         allow_domain_literals = TRUE;
2085         strip_trailing_dot = TRUE;
2086         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2087           &sender_address_domain, TRUE);
2088         allow_domain_literals = FALSE;
2089         strip_trailing_dot = FALSE;
2090         if (sender_address == NULL)
2091           {
2092           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2093           return EXIT_FAILURE;
2094           }
2095         }
2096       sender_address_forced = TRUE;
2097       }
2098     break;
2099
2100     /* This is some Sendmail thing which can be ignored */
2101
2102     case 'G':
2103     break;
2104
2105     /* -h: Set the hop count for an incoming message. Exim does not currently
2106     support this; it always computes it by counting the Received: headers.
2107     To put it in will require a change to the spool header file format. */
2108
2109     case 'h':
2110     if (*argrest == 0)
2111       {
2112       if(++i < argc) argrest = argv[i]; else
2113         { badarg = TRUE; break; }
2114       }
2115     if (!isdigit(*argrest)) badarg = TRUE;
2116     break;
2117
2118
2119     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2120     not to be documented for sendmail but mailx (at least) uses it) */
2121
2122     case 'i':
2123     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2124     break;
2125
2126
2127     case 'M':
2128     receiving_message = FALSE;
2129
2130     /* -MC:  continue delivery of another message via an existing open
2131     file descriptor. This option is used for an internal call by the
2132     smtp transport when there is a pending message waiting to go to an
2133     address to which it has got a connection. Five subsequent arguments are
2134     required: transport name, host name, IP address, sequence number, and
2135     message_id. Transports may decline to create new processes if the sequence
2136     number gets too big. The channel is stdin. This (-MC) must be the last
2137     argument. There's a subsequent check that the real-uid is privileged.
2138
2139     If we are running in the test harness. delay for a bit, to let the process
2140     that set this one up complete. This makes for repeatability of the logging,
2141     etc. output. */
2142
2143     if (Ustrcmp(argrest, "C") == 0)
2144       {
2145       if (argc != i + 6)
2146         {
2147         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2148         return EXIT_FAILURE;
2149         }
2150
2151       if (msg_action_arg >= 0)
2152         {
2153         fprintf(stderr, "exim: incompatible arguments\n");
2154         return EXIT_FAILURE;
2155         }
2156
2157       continue_transport = argv[++i];
2158       continue_hostname = argv[++i];
2159       continue_host_address = argv[++i];
2160       continue_sequence = Uatoi(argv[++i]);
2161       msg_action = MSG_DELIVER;
2162       msg_action_arg = ++i;
2163       forced_delivery = TRUE;
2164       queue_run_pid = passed_qr_pid;
2165       queue_run_pipe = passed_qr_pipe;
2166
2167       if (!mac_ismsgid(argv[i]))
2168         {
2169         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2170           argv[i]);
2171         return EXIT_FAILURE;
2172         }
2173
2174       if (running_in_test_harness) millisleep(500);
2175       break;
2176       }
2177
2178     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2179     precedes -MC (see above). The flag indicates that the host to which
2180     Exim is connected has accepted an AUTH sequence. */
2181
2182     else if (Ustrcmp(argrest, "CA") == 0)
2183       {
2184       smtp_authenticated = TRUE;
2185       break;
2186       }
2187
2188     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2189     it preceded -MC (see above) */
2190
2191     else if (Ustrcmp(argrest, "CP") == 0)
2192       {
2193       smtp_use_pipelining = TRUE;
2194       break;
2195       }
2196
2197     /* -MCQ: pass on the pid of the queue-running process that started
2198     this chain of deliveries and the fd of its synchronizing pipe; this
2199     is useful only when it precedes -MC (see above) */
2200
2201     else if (Ustrcmp(argrest, "CQ") == 0)
2202       {
2203       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2204         else badarg = TRUE;
2205       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2206         else badarg = TRUE;
2207       break;
2208       }
2209
2210     /* -MCS: set the smtp_use_size flag; this is useful only when it
2211     precedes -MC (see above) */
2212
2213     else if (Ustrcmp(argrest, "CS") == 0)
2214       {
2215       smtp_use_size = TRUE;
2216       break;
2217       }
2218
2219     /* -MCT: set the tls_offered flag; this is useful only when it
2220     precedes -MC (see above). The flag indicates that the host to which
2221     Exim is connected has offered TLS support. */
2222
2223     #ifdef SUPPORT_TLS
2224     else if (Ustrcmp(argrest, "CT") == 0)
2225       {
2226       tls_offered = TRUE;
2227       break;
2228       }
2229     #endif
2230
2231     /* -M[x]: various operations on the following list of message ids:
2232        -M    deliver the messages, ignoring next retry times and thawing
2233        -Mc   deliver the messages, checking next retry times, no thawing
2234        -Mf   freeze the messages
2235        -Mg   give up on the messages
2236        -Mt   thaw the messages
2237        -Mrm  remove the messages
2238     In the above cases, this must be the last option. There are also the
2239     following options which are followed by a single message id, and which
2240     act on that message. Some of them use the "recipient" addresses as well.
2241        -Mar  add recipient(s)
2242        -Mmad mark all recipients delivered
2243        -Mmd  mark recipients(s) delivered
2244        -Mes  edit sender
2245        -Mvb  show body
2246        -Mvh  show header
2247        -Mvl  show log
2248     */
2249
2250     else if (*argrest == 0)
2251       {
2252       msg_action = MSG_DELIVER;
2253       forced_delivery = deliver_force_thaw = TRUE;
2254       }
2255     else if (Ustrcmp(argrest, "ar") == 0)
2256       {
2257       msg_action = MSG_ADD_RECIPIENT;
2258       one_msg_action = TRUE;
2259       }
2260     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2261     else if (Ustrcmp(argrest, "es") == 0)
2262       {
2263       msg_action = MSG_EDIT_SENDER;
2264       one_msg_action = TRUE;
2265       }
2266     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2267     else if (Ustrcmp(argrest, "g") == 0)
2268       {
2269       msg_action = MSG_DELIVER;
2270       deliver_give_up = TRUE;
2271       }
2272     else if (Ustrcmp(argrest, "mad") == 0)
2273       {
2274       msg_action = MSG_MARK_ALL_DELIVERED;
2275       }
2276     else if (Ustrcmp(argrest, "md") == 0)
2277       {
2278       msg_action = MSG_MARK_DELIVERED;
2279       one_msg_action = TRUE;
2280       }
2281     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2282     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2283     else if (Ustrcmp(argrest, "vb") == 0)
2284       {
2285       msg_action = MSG_SHOW_BODY;
2286       one_msg_action = TRUE;
2287       }
2288     else if (Ustrcmp(argrest, "vh") == 0)
2289       {
2290       msg_action = MSG_SHOW_HEADER;
2291       one_msg_action = TRUE;
2292       }
2293     else if (Ustrcmp(argrest, "vl") == 0)
2294       {
2295       msg_action = MSG_SHOW_LOG;
2296       one_msg_action = TRUE;
2297       }
2298     else { badarg = TRUE; break; }
2299
2300     /* All the -Mxx options require at least one message id. */
2301
2302     msg_action_arg = i + 1;
2303     if (msg_action_arg >= argc)
2304       {
2305       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2306       return EXIT_FAILURE;
2307       }
2308
2309     /* Some require only message ids to follow */
2310
2311     if (!one_msg_action)
2312       {
2313       int j;
2314       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2315         {
2316         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2317           argv[j], arg);
2318         return EXIT_FAILURE;
2319         }
2320       goto END_ARG;   /* Remaining args are ids */
2321       }
2322
2323     /* Others require only one message id, possibly followed by addresses,
2324     which will be handled as normal arguments. */
2325
2326     else
2327       {
2328       if (!mac_ismsgid(argv[msg_action_arg]))
2329         {
2330         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2331           argv[msg_action_arg], arg);
2332         return EXIT_FAILURE;
2333         }
2334       i++;
2335       }
2336     break;
2337
2338
2339     /* Some programs seem to call the -om option without the leading o;
2340     for sendmail it askes for "me too". Exim always does this. */
2341
2342     case 'm':
2343     if (*argrest != 0) badarg = TRUE;
2344     break;
2345
2346
2347     /* -N: don't do delivery - a debugging option that stops transports doing
2348     their thing. It implies debugging at the D_v level. */
2349
2350     case 'N':
2351     if (*argrest == 0)
2352       {
2353       dont_deliver = TRUE;
2354       debug_selector |= D_v;
2355       debug_file = stderr;
2356       }
2357     else badarg = TRUE;
2358     break;
2359
2360
2361     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2362     it. */
2363
2364     case 'n':
2365     break;
2366
2367     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2368     option to the specified value. This form uses long names. We need to handle
2369     -O option=value and -Ooption=value. */
2370
2371     case 'O':
2372     if (*argrest == 0)
2373       {
2374       if (++i >= argc)
2375         {
2376         fprintf(stderr, "exim: string expected after -O\n");
2377         exit(EXIT_FAILURE);
2378         }
2379       }
2380     break;
2381
2382     case 'o':
2383
2384     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2385     file" option). */
2386
2387     if (*argrest == 'A')
2388       {
2389       alias_arg = argrest + 1;
2390       if (alias_arg[0] == 0)
2391         {
2392         if (i+1 < argc) alias_arg = argv[++i]; else
2393           {
2394           fprintf(stderr, "exim: string expected after -oA\n");
2395           exit(EXIT_FAILURE);
2396           }
2397         }
2398       }
2399
2400     /* -oB: Set a connection message max value for remote deliveries */
2401
2402     else if (*argrest == 'B')
2403       {
2404       uschar *p = argrest + 1;
2405       if (p[0] == 0)
2406         {
2407         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2408           {
2409           connection_max_messages = 1;
2410           p = NULL;
2411           }
2412         }
2413
2414       if (p != NULL)
2415         {
2416         if (!isdigit(*p))
2417           {
2418           fprintf(stderr, "exim: number expected after -oB\n");
2419           exit(EXIT_FAILURE);
2420           }
2421         connection_max_messages = Uatoi(p);
2422         }
2423       }
2424
2425     /* -odb: background delivery */
2426
2427     else if (Ustrcmp(argrest, "db") == 0)
2428       {
2429       synchronous_delivery = FALSE;
2430       arg_queue_only = FALSE;
2431       queue_only_set = TRUE;
2432       }
2433
2434     /* -odf: foreground delivery (smail-compatible option); same effect as
2435        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2436     */
2437
2438     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2439       {
2440       synchronous_delivery = TRUE;
2441       arg_queue_only = FALSE;
2442       queue_only_set = TRUE;
2443       }
2444
2445     /* -odq: queue only */
2446
2447     else if (Ustrcmp(argrest, "dq") == 0)
2448       {
2449       synchronous_delivery = FALSE;
2450       arg_queue_only = TRUE;
2451       queue_only_set = TRUE;
2452       }
2453
2454     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2455     but no remote delivery */
2456
2457     else if (Ustrcmp(argrest, "dqs") == 0)
2458       {
2459       queue_smtp = TRUE;
2460       arg_queue_only = FALSE;
2461       queue_only_set = TRUE;
2462       }
2463
2464     /* -oex: Sendmail error flags. As these are also accepted without the
2465     leading -o prefix, for compatibility with vacation and other callers,
2466     they are handled with -e above. */
2467
2468     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2469        -oitrue: Another sendmail syntax for the same */
2470
2471     else if (Ustrcmp(argrest, "i") == 0 ||
2472              Ustrcmp(argrest, "itrue") == 0)
2473       dot_ends = FALSE;
2474
2475     /* -oM*: Set various characteristics for an incoming message; actually
2476     acted on for trusted callers only. */
2477
2478     else if (*argrest == 'M')
2479       {
2480       if (i+1 >= argc)
2481         {
2482         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2483         exit(EXIT_FAILURE);
2484         }
2485
2486       /* -oMa: Set sender host address */
2487
2488       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2489
2490       /* -oMaa: Set authenticator name */
2491
2492       else if (Ustrcmp(argrest, "Maa") == 0)
2493         sender_host_authenticated = argv[++i];
2494
2495       /* -oMas: setting authenticated sender */
2496
2497       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2498
2499       /* -oMai: setting authenticated id */
2500
2501       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2502
2503       /* -oMi: Set incoming interface address */
2504
2505       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2506
2507       /* -oMr: Received protocol */
2508
2509       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2510
2511       /* -oMs: Set sender host name */
2512
2513       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2514
2515       /* -oMt: Set sender ident */
2516
2517       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2518
2519       /* Else a bad argument */
2520
2521       else
2522         {
2523         badarg = TRUE;
2524         break;
2525         }
2526       }
2527
2528     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2529     seem to call this as -m (undocumented), so that is also accepted (see
2530     above). */
2531
2532     else if (Ustrcmp(argrest, "m") == 0) {}
2533
2534     /* -oo: An ancient flag for old-style addresses which still seems to
2535     crop up in some calls (see in SCO). */
2536
2537     else if (Ustrcmp(argrest, "o") == 0) {}
2538
2539     /* -oP <name>: set pid file path for daemon */
2540
2541     else if (Ustrcmp(argrest, "P") == 0)
2542       override_pid_file_path = argv[++i];
2543
2544     /* -or <n>: set timeout for non-SMTP acceptance
2545        -os <n>: set timeout for SMTP acceptance */
2546
2547     else if (*argrest == 'r' || *argrest == 's')
2548       {
2549       int *tp = (*argrest == 'r')?
2550         &arg_receive_timeout : &arg_smtp_receive_timeout;
2551       if (argrest[1] == 0)
2552         {
2553         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2554         }
2555       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2556       if (*tp < 0)
2557         {
2558         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2559         exit(EXIT_FAILURE);
2560         }
2561       }
2562
2563     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2564
2565     else if (Ustrcmp(argrest, "X") == 0)
2566       override_local_interfaces = argv[++i];
2567
2568     /* Unknown -o argument */
2569
2570     else badarg = TRUE;
2571     break;
2572
2573
2574     /* -ps: force Perl startup; -pd force delayed Perl startup */
2575
2576     case 'p':
2577     #ifdef EXIM_PERL
2578     if (*argrest == 's' && argrest[1] == 0)
2579       {
2580       perl_start_option = 1;
2581       break;
2582       }
2583     if (*argrest == 'd' && argrest[1] == 0)
2584       {
2585       perl_start_option = -1;
2586       break;
2587       }
2588     #endif
2589
2590     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2591     which sets the host protocol and host name */
2592
2593     if (*argrest == 0)
2594       {
2595       if (i+1 < argc) argrest = argv[++i]; else
2596         { badarg = TRUE; break; }
2597       }
2598
2599     if (*argrest != 0)
2600       {
2601       uschar *hn = Ustrchr(argrest, ':');
2602       if (hn == NULL)
2603         {
2604         received_protocol = argrest;
2605         }
2606       else
2607         {
2608         received_protocol = string_copyn(argrest, hn - argrest);
2609         sender_host_name = hn + 1;
2610         }
2611       }
2612     break;
2613
2614
2615     case 'q':
2616     receiving_message = FALSE;
2617
2618     /* -qq...: Do queue runs in a 2-stage manner */
2619
2620     if (*argrest == 'q')
2621       {
2622       queue_2stage = TRUE;
2623       argrest++;
2624       }
2625
2626     /* -qi...: Do only first (initial) deliveries */
2627
2628     if (*argrest == 'i')
2629       {
2630       queue_run_first_delivery = TRUE;
2631       argrest++;
2632       }
2633
2634     /* -qf...: Run the queue, forcing deliveries
2635        -qff..: Ditto, forcing thawing as well */
2636
2637     if (*argrest == 'f')
2638       {
2639       queue_run_force = TRUE;
2640       if (*(++argrest) == 'f')
2641         {
2642         deliver_force_thaw = TRUE;
2643         argrest++;
2644         }
2645       }
2646
2647     /* -q[f][f]l...: Run the queue only on local deliveries */
2648
2649     if (*argrest == 'l')
2650       {
2651       queue_run_local = TRUE;
2652       argrest++;
2653       }
2654
2655     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2656     optionally starting from a given message id. */
2657
2658     if (*argrest == 0 &&
2659         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2660       {
2661       queue_interval = 0;
2662       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2663         start_queue_run_id = argv[++i];
2664       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2665         stop_queue_run_id = argv[++i];
2666       }
2667
2668     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2669     optionally local only. */
2670
2671     else
2672       {
2673       if (*argrest != 0)
2674         queue_interval = readconf_readtime(argrest, 0, FALSE);
2675       else
2676         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2677       if (queue_interval <= 0)
2678         {
2679         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2680         exit(EXIT_FAILURE);
2681         }
2682       }
2683     break;
2684
2685
2686     case 'R':   /* Synonymous with -qR... */
2687     receiving_message = FALSE;
2688
2689     /* -Rf:   As -R (below) but force all deliveries,
2690        -Rff:  Ditto, but also thaw all frozen messages,
2691        -Rr:   String is regex
2692        -Rrf:  Regex and force
2693        -Rrff: Regex and force and thaw
2694
2695     in all cases provided there are no further characters in this
2696     argument. */
2697
2698     if (*argrest != 0)
2699       {
2700       int i;
2701       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2702         {
2703         if (Ustrcmp(argrest, rsopts[i]) == 0)
2704           {
2705           if (i != 2) queue_run_force = TRUE;
2706           if (i >= 2) deliver_selectstring_regex = TRUE;
2707           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2708           argrest += Ustrlen(rsopts[i]);
2709           }
2710         }
2711       }
2712
2713     /* -R: Set string to match in addresses for forced queue run to
2714     pick out particular messages. */
2715
2716     if (*argrest == 0)
2717       {
2718       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2719         {
2720         fprintf(stderr, "exim: string expected after -R\n");
2721         exit(EXIT_FAILURE);
2722         }
2723       }
2724     else deliver_selectstring = argrest;
2725     if (queue_interval < 0) queue_interval = 0;
2726     break;
2727
2728
2729     /* -r: an obsolete synonym for -f (see above) */
2730
2731
2732     /* -S: Like -R but works on sender. */
2733
2734     case 'S':   /* Synonymous with -qS... */
2735     receiving_message = FALSE;
2736
2737     /* -Sf:   As -S (below) but force all deliveries,
2738        -Sff:  Ditto, but also thaw all frozen messages,
2739        -Sr:   String is regex
2740        -Srf:  Regex and force
2741        -Srff: Regex and force and thaw
2742
2743     in all cases provided there are no further characters in this
2744     argument. */
2745
2746     if (*argrest != 0)
2747       {
2748       int i;
2749       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2750         {
2751         if (Ustrcmp(argrest, rsopts[i]) == 0)
2752           {
2753           if (i != 2) queue_run_force = TRUE;
2754           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2755           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2756           argrest += Ustrlen(rsopts[i]);
2757           }
2758         }
2759       }
2760
2761     /* -S: Set string to match in addresses for forced queue run to
2762     pick out particular messages. */
2763
2764     if (*argrest == 0)
2765       {
2766       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2767         {
2768         fprintf(stderr, "exim: string expected after -S\n");
2769         exit(EXIT_FAILURE);
2770         }
2771       }
2772     else deliver_selectstring_sender = argrest;
2773     if (queue_interval < 0) queue_interval = 0;
2774     break;
2775
2776     /* -Tqt is an option that is exclusively for use by the testing suite.
2777     It is not recognized in other circumstances. It allows for the setting up
2778     of explicit "queue times" so that various warning/retry things can be
2779     tested. Otherwise variability of clock ticks etc. cause problems. */
2780
2781     case 'T':
2782     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2783       fudged_queue_times = argv[++i];
2784     else badarg = TRUE;
2785     break;
2786
2787
2788     /* -t: Set flag to extract recipients from body of message. */
2789
2790     case 't':
2791     if (*argrest == 0) extract_recipients = TRUE;
2792
2793     /* -ti: Set flag to extract recipients from body of message, and also
2794     specify that dot does not end the message. */
2795
2796     else if (Ustrcmp(argrest, "i") == 0)
2797       {
2798       extract_recipients = TRUE;
2799       dot_ends = FALSE;
2800       }
2801
2802     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2803
2804     #ifdef SUPPORT_TLS
2805     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2806     #endif
2807
2808     else badarg = TRUE;
2809     break;
2810
2811
2812     /* -U: This means "initial user submission" in sendmail, apparently. The
2813     doc claims that in future sendmail may refuse syntactically invalid
2814     messages instead of fixing them. For the moment, we just ignore it. */
2815
2816     case 'U':
2817     break;
2818
2819
2820     /* -v: verify things - this is a very low-level debugging */
2821
2822     case 'v':
2823     if (*argrest == 0)
2824       {
2825       debug_selector |= D_v;
2826       debug_file = stderr;
2827       }
2828     else badarg = TRUE;
2829     break;
2830
2831
2832     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2833
2834       The -x flag tells the sendmail command that mail from a local
2835       mail program has National Language Support (NLS) extended characters
2836       in the body of the mail item. The sendmail command can send mail with
2837       extended NLS characters across networks that normally corrupts these
2838       8-bit characters.
2839
2840     As Exim is 8-bit clean, it just ignores this flag. */
2841
2842     case 'x':
2843     if (*argrest != 0) badarg = TRUE;
2844     break;
2845
2846     /* All other initial characters are errors */
2847
2848     default:
2849     badarg = TRUE;
2850     break;
2851     }         /* End of high-level switch statement */
2852
2853   /* Failed to recognize the option, or syntax error */
2854
2855   if (badarg)
2856     {
2857     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2858       "option %s\n", arg);
2859     exit(EXIT_FAILURE);
2860     }
2861   }
2862
2863
2864 /* Arguments have been processed. Check for incompatibilities. */
2865
2866 END_ARG:
2867 if ((
2868     (smtp_input || extract_recipients || recipients_arg < argc) &&
2869     (daemon_listen || queue_interval >= 0 || bi_option ||
2870       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2871       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2872     ) ||
2873     (
2874     msg_action_arg > 0 &&
2875     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2876      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2877     ) ||
2878     (
2879     (daemon_listen || queue_interval >= 0) &&
2880     (sender_address != NULL || list_options || list_queue || checking ||
2881      bi_option)
2882     ) ||
2883     (
2884     daemon_listen && queue_interval == 0
2885     ) ||
2886     (
2887     list_options &&
2888     (checking || smtp_input || extract_recipients ||
2889       filter_test != FTEST_NONE || bi_option)
2890     ) ||
2891     (
2892     verify_address_mode &&
2893     (address_test_mode || smtp_input || extract_recipients ||
2894       filter_test != FTEST_NONE || bi_option)
2895     ) ||
2896     (
2897     address_test_mode && (smtp_input || extract_recipients ||
2898       filter_test != FTEST_NONE || bi_option)
2899     ) ||
2900     (
2901     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2902       extract_recipients)
2903     ) ||
2904     (
2905     deliver_selectstring != NULL && queue_interval < 0
2906     )
2907    )
2908   {
2909   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2910   exit(EXIT_FAILURE);
2911   }
2912
2913 /* If debugging is set up, set the file and the file descriptor to pass on to
2914 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2915 to run in the foreground. */
2916
2917 if (debug_selector != 0)
2918   {
2919   debug_file = stderr;
2920   debug_fd = fileno(debug_file);
2921   background_daemon = FALSE;
2922   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2923   if (debug_selector != D_v)    /* -v only doesn't show this */
2924     {
2925     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2926       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2927       debug_selector);
2928     show_whats_supported(stderr);
2929     }
2930   }
2931
2932 /* When started with root privilege, ensure that the limits on the number of
2933 open files and the number of processes (where that is accessible) are
2934 sufficiently large, or are unset, in case Exim has been called from an
2935 environment where the limits are screwed down. Not all OS have the ability to
2936 change some of these limits. */
2937
2938 if (unprivileged)
2939   {
2940   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2941   }
2942 else
2943   {
2944   struct rlimit rlp;
2945
2946   #ifdef RLIMIT_NOFILE
2947   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2948     {
2949     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2950       strerror(errno));
2951     rlp.rlim_cur = rlp.rlim_max = 0;
2952     }
2953
2954   /* I originally chose 1000 as a nice big number that was unlikely to
2955   be exceeded. It turns out that some older OS have a fixed upper limit of
2956   256. */
2957
2958   if (rlp.rlim_cur < 1000)
2959     {
2960     rlp.rlim_cur = rlp.rlim_max = 1000;
2961     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2962       {
2963       rlp.rlim_cur = rlp.rlim_max = 256;
2964       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2965         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2966           strerror(errno));
2967       }
2968     }
2969   #endif
2970
2971   #ifdef RLIMIT_NPROC
2972   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2973     {
2974     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2975       strerror(errno));
2976     rlp.rlim_cur = rlp.rlim_max = 0;
2977     }
2978
2979   #ifdef RLIM_INFINITY
2980   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2981     {
2982     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2983   #else
2984   if (rlp.rlim_cur < 1000)
2985     {
2986     rlp.rlim_cur = rlp.rlim_max = 1000;
2987   #endif
2988     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2989       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2990         strerror(errno));
2991     }
2992   #endif
2993   }
2994
2995 /* Exim is normally entered as root (but some special configurations are
2996 possible that don't do this). However, it always spins off sub-processes that
2997 set their uid and gid as required for local delivery. We don't want to pass on
2998 any extra groups that root may belong to, so we want to get rid of them all at
2999 this point.
3000
3001 We need to obey setgroups() at this stage, before possibly giving up root
3002 privilege for a changed configuration file, but later on we might need to
3003 check on the additional groups for the admin user privilege - can't do that
3004 till after reading the config, which might specify the exim gid. Therefore,
3005 save the group list here first. */
3006
3007 group_count = getgroups(NGROUPS_MAX, group_list);
3008
3009 /* There is a fundamental difference in some BSD systems in the matter of
3010 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3011 known not to be different. On the "different" systems there is a single group
3012 list, and the first entry in it is the current group. On all other versions of
3013 Unix there is a supplementary group list, which is in *addition* to the current
3014 group. Consequently, to get rid of all extraneous groups on a "standard" system
3015 you pass over 0 groups to setgroups(), while on a "different" system you pass
3016 over a single group - the current group, which is always the first group in the
3017 list. Calling setgroups() with zero groups on a "different" system results in
3018 an error return. The following code should cope with both types of system.
3019
3020 However, if this process isn't running as root, setgroups() can't be used
3021 since you have to be root to run it, even if throwing away groups. Not being
3022 root here happens only in some unusual configurations. We just ignore the
3023 error. */
3024
3025 if (setgroups(0, NULL) != 0)
3026   {
3027   if (setgroups(1, group_list) != 0 && !unprivileged)
3028     {
3029     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3030     exit(EXIT_FAILURE);
3031     }
3032   }
3033
3034 /* If the configuration file name has been altered by an argument on the
3035 command line (either a new file name or a macro definition) and the caller is
3036 not root or the exim user, or if this is a filter testing run, remove any
3037 setuid privilege the program has, and run as the underlying user.
3038
3039 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3040 severely restricts the use of -C for some purposes.
3041
3042 Otherwise, set the real ids to the effective values (should be root unless run
3043 from inetd, which it can either be root or the exim uid, if one is configured).
3044
3045 There is a private mechanism for bypassing some of this, in order to make it
3046 possible to test lots of configurations automatically, without having either to
3047 recompile each time, or to patch in an actual configuration file name and other
3048 values (such as the path name). If running in the test harness, pretend that
3049 configuration file changes and macro definitions haven't happened. */
3050
3051 if ((                                            /* EITHER */
3052     (config_changed || macros != NULL) &&        /* Config changed, and */
3053     real_uid != root_uid &&                      /* Not root, and */
3054     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3055     real_uid != exim_uid &&                      /* Not exim, and */
3056     #endif
3057     !running_in_test_harness                     /* Not fudged */
3058     ) ||                                         /*   OR   */
3059     expansion_test                               /* expansion testing */
3060     ||                                           /*   OR   */
3061     filter_test != FTEST_NONE)                   /* Filter testing */
3062   {
3063   setgroups(group_count, group_list);
3064   exim_setugid(real_uid, real_gid, FALSE,
3065     US"-C, -D, -be or -bf forces real uid");
3066   removed_privilege = TRUE;
3067
3068   /* In the normal case when Exim is called like this, stderr is available
3069   and should be used for any logging information because attempts to write
3070   to the log will usually fail. To arrange this, we unset really_exim. However,
3071   if no stderr is available there is no point - we might as well have a go
3072   at the log (if it fails, syslog will be written). */
3073
3074   if (log_stderr != NULL) really_exim = FALSE;
3075   }
3076
3077 /* Privilege is to be retained for the moment. It may be dropped later,
3078 depending on the job that this Exim process has been asked to do. For now, set
3079 the real uid to the effective so that subsequent re-execs of Exim are done by a
3080 privileged user. */
3081
3082 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3083
3084 /* If testing a filter, open the file(s) now, before wasting time doing other
3085 setups and reading the message. */
3086
3087 if ((filter_test & FTEST_SYSTEM) != 0)
3088   {
3089   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3090   if (filter_sfd < 0)
3091     {
3092     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3093       strerror(errno));
3094     return EXIT_FAILURE;
3095     }
3096   }
3097
3098 if ((filter_test & FTEST_USER) != 0)
3099   {
3100   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3101   if (filter_ufd < 0)
3102     {
3103     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3104       strerror(errno));
3105     return EXIT_FAILURE;
3106     }
3107   }
3108
3109 /* Read the main runtime configuration data; this gives up if there
3110 is a failure. It leaves the configuration file open so that the subsequent
3111 configuration data for delivery can be read if needed. */
3112
3113 readconf_main();
3114
3115 /* Handle the decoding of logging options. */
3116
3117 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3118   log_options, log_options_count, US"log");
3119
3120 DEBUG(D_any)
3121   {
3122   debug_printf("configuration file is %s\n", config_main_filename);
3123   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3124     log_extra_selector);
3125   }
3126
3127 /* If domain literals are not allowed, check the sender address that was
3128 supplied with -f. Ditto for a stripped trailing dot. */
3129
3130 if (sender_address != NULL)
3131   {
3132   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3133     {
3134     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3135       "allowed\n", sender_address);
3136     return EXIT_FAILURE;
3137     }
3138   if (f_end_dot && !strip_trailing_dot)
3139     {
3140     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3141       "(trailing dot not allowed)\n", sender_address);
3142     return EXIT_FAILURE;
3143     }
3144   }
3145
3146 /* Paranoia check of maximum lengths of certain strings. There is a check
3147 on the length of the log file path in log.c, which will come into effect
3148 if there are any calls to write the log earlier than this. However, if we
3149 get this far but the string is very long, it is better to stop now than to
3150 carry on and (e.g.) receive a message and then have to collapse. The call to
3151 log_write() from here will cause the ultimate panic collapse if the complete
3152 file name exceeds the buffer length. */
3153
3154 if (Ustrlen(log_file_path) > 200)
3155   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3156     "log_file_path is longer than 200 chars: aborting");
3157
3158 if (Ustrlen(pid_file_path) > 200)
3159   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3160     "pid_file_path is longer than 200 chars: aborting");
3161
3162 if (Ustrlen(spool_directory) > 200)
3163   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3164     "spool_directory is longer than 200 chars: aborting");
3165
3166 /* Length check on the process name given to syslog for its TAG field,
3167 which is only permitted to be 32 characters or less. See RFC 3164. */
3168
3169 if (Ustrlen(syslog_processname) > 32)
3170   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3171     "syslog_processname is longer than 32 chars: aborting");
3172
3173 /* In some operating systems, the environment variable TMPDIR controls where
3174 temporary files are created; Exim doesn't use these (apart from when delivering
3175 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3176 If TMPDIR is found in the environment, reset it to the value defined in the
3177 TMPDIR macro, if this macro is defined. */
3178
3179 #ifdef TMPDIR
3180   {
3181   uschar **p;
3182   for (p = USS environ; *p != NULL; p++)
3183     {
3184     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3185         Ustrcmp(*p+7, TMPDIR) != 0)
3186       {
3187       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3188       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3189       *p = newp;
3190       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3191       }
3192     }
3193   }
3194 #endif
3195
3196 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3197 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3198 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3199 called by a user who has set the TZ variable. This then affects the timestamps
3200 in log files and in Received: headers, and any created Date: header lines. The
3201 required timezone is settable in the configuration file, so nothing can be done
3202 about this earlier - but hopefully nothing will normally be logged earlier than
3203 this. We have to make a new environment if TZ is wrong, but don't bother if
3204 timestamps_utc is set, because then all times are in UTC anyway. */
3205
3206 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3207   {
3208   timestamps_utc = TRUE;
3209   }
3210 else
3211   {
3212   uschar *envtz = US getenv("TZ");
3213   if ((envtz == NULL && timezone_string != NULL) ||
3214       (envtz != NULL &&
3215         (timezone_string == NULL ||
3216          Ustrcmp(timezone_string, envtz) != 0)))
3217     {
3218     uschar **p = USS environ;
3219     uschar **new;
3220     uschar **newp;
3221     int count = 0;
3222     while (*p++ != NULL) count++;
3223     if (envtz == NULL) count++;
3224     newp = new = malloc(sizeof(uschar *) * (count + 1));
3225     for (p = USS environ; *p != NULL; p++)
3226       {
3227       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3228       *newp++ = *p;
3229       }
3230     if (timezone_string != NULL)
3231       {
3232       *newp = malloc(Ustrlen(timezone_string) + 4);
3233       sprintf(CS *newp++, "TZ=%s", timezone_string);
3234       }
3235     *newp = NULL;
3236     environ = CSS new;
3237     tzset();
3238     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3239       tod_stamp(tod_log));
3240     }
3241   }
3242
3243 /* Handle the case when we have removed the setuid privilege because of -C or
3244 -D. This means that the caller of Exim was not root, and, provided that
3245 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3246 the binary.
3247
3248 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3249 were running as the exim user defined in the configuration file (different to
3250 the one in the binary). The sysadmin may expect this case to retain privilege
3251 because "the binary was called by the Exim user", but it hasn't, because of the
3252 order in which it handles this stuff. There are two possibilities:
3253
3254   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3255       to do message deliveries. Thus, the fact that it is running as a
3256       non-privileged user is plausible, and might be wanted in some special
3257       configurations. However, really_exim will have been set false when
3258       privilege was dropped, to stop Exim trying to write to its normal log
3259       files. Therefore, re-enable normal log processing, assuming the sysadmin
3260       has set up the log directory correctly.
3261
3262   (2) If deliver_drop_privilege is not set, the configuration won't work as
3263       apparently intended, and so we log a panic message. In order to retain
3264       root for -C or -D, the caller must either be root or the Exim user
3265       defined in the binary (when deliver_drop_ privilege is false).
3266
3267 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3268 built-in exim user or one defined in the configuration. In either event,
3269 re-enable log processing, assuming the sysadmin knows what they are doing. */
3270
3271 if (removed_privilege && (config_changed || macros != NULL) &&
3272     real_uid == exim_uid)
3273   {
3274   #ifdef ALT_CONFIG_ROOT_ONLY
3275   really_exim = TRUE;   /* let logging work normally */
3276   #else
3277
3278   if (deliver_drop_privilege)
3279     really_exim = TRUE; /* let logging work normally */
3280   else
3281     log_write(0, LOG_MAIN|LOG_PANIC,
3282       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3283       (int)exim_uid, config_changed? "-C" : "-D");
3284   #endif
3285   }
3286
3287 /* Start up Perl interpreter if Perl support is configured and there is a
3288 perl_startup option, and the configuration or the command line specifies
3289 initializing starting. Note that the global variables are actually called
3290 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3291
3292 #ifdef EXIM_PERL
3293 if (perl_start_option != 0)
3294   opt_perl_at_start = (perl_start_option > 0);
3295 if (opt_perl_at_start && opt_perl_startup != NULL)
3296   {
3297   uschar *errstr;
3298   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3299   errstr = init_perl(opt_perl_startup);
3300   if (errstr != NULL)
3301     {
3302     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3303     return EXIT_FAILURE;
3304     }
3305   opt_perl_started = TRUE;
3306   }
3307 #endif /* EXIM_PERL */
3308
3309 /* Log the arguments of the call if the configuration file said so. This is
3310 a debugging feature for finding out what arguments certain MUAs actually use.
3311 Don't attempt it if logging is disabled, or if listing variables or if
3312 verifying/testing addresses or expansions. */
3313
3314 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3315       && really_exim && !list_options && !checking)
3316   {
3317   int i;
3318   uschar *p = big_buffer;
3319   Ustrcpy(p, "cwd=");
3320   (void)getcwd(CS p+4, big_buffer_size - 4);
3321   while (*p) p++;
3322   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3323   while (*p) p++;
3324   for (i = 0; i < argc; i++)
3325     {
3326     int len = Ustrlen(argv[i]);
3327     uschar *printing;
3328     uschar *quote;
3329     if (p + len + 8 >= big_buffer + big_buffer_size)
3330       {
3331       Ustrcpy(p, " ...");
3332       log_write(0, LOG_MAIN, "%s", big_buffer);
3333       Ustrcpy(big_buffer, "...");
3334       p = big_buffer + 3;
3335       }
3336     printing = string_printing(argv[i]);
3337     if (printing[0] == 0) quote = US"\""; else
3338       {
3339       uschar *pp = printing;
3340       quote = US"";
3341       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3342       }
3343     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3344       (p - big_buffer) - 4), printing, quote);
3345     while (*p) p++;
3346     }
3347
3348   if ((log_extra_selector & LX_arguments) != 0)
3349     log_write(0, LOG_MAIN, "%s", big_buffer);
3350   else
3351     debug_printf("%s\n", big_buffer);
3352   }
3353
3354 /* Set the working directory to be the top-level spool directory. We don't rely
3355 on this in the code, which always uses fully qualified names, but it's useful
3356 for core dumps etc. Don't complain if it fails - the spool directory might not
3357 be generally accessible and calls with the -C option (and others) have lost
3358 privilege by now. Before the chdir, we try to ensure that the directory exists.
3359 */
3360
3361 if (Uchdir(spool_directory) != 0)
3362   {
3363   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3364   (void)Uchdir(spool_directory);
3365   }
3366
3367 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3368 alias file. Exim doesn't have such a concept, but this call is screwed into
3369 Sun's YP makefiles. Handle this by calling a configured script, as the real
3370 user who called Exim. The -oA option can be used to pass an argument to the
3371 script. */
3372
3373 if (bi_option)
3374   {
3375   (void)fclose(config_file);
3376   if (bi_command != NULL)
3377     {
3378     int i = 0;
3379     uschar *argv[3];
3380     argv[i++] = bi_command;
3381     if (alias_arg != NULL) argv[i++] = alias_arg;
3382     argv[i++] = NULL;
3383
3384     setgroups(group_count, group_list);
3385     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3386
3387     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3388       (argv[1] == NULL)? US"" : argv[1]);
3389
3390     execv(CS argv[0], (char *const *)argv);
3391     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3392     exit(EXIT_FAILURE);
3393     }
3394   else
3395     {
3396     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3397     exit(EXIT_SUCCESS);
3398     }
3399   }
3400
3401 /* If an action on specific messages is requested, or if a daemon or queue
3402 runner is being started, we need to know if Exim was called by an admin user.
3403 This is the case if the real user is root or exim, or if the real group is
3404 exim, or if one of the supplementary groups is exim or a group listed in
3405 admin_groups. We don't fail all message actions immediately if not admin_user,
3406 since some actions can be performed by non-admin users. Instead, set admin_user
3407 for later interrogation. */
3408
3409 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3410   admin_user = TRUE;
3411 else
3412   {
3413   int i, j;
3414
3415   for (i = 0; i < group_count; i++)
3416     {
3417     if (group_list[i] == exim_gid) admin_user = TRUE;
3418     else if (admin_groups != NULL)
3419       {
3420       for (j = 1; j <= (int)(admin_groups[0]); j++)
3421         if (admin_groups[j] == group_list[i])
3422           { admin_user = TRUE; break; }
3423       }
3424     if (admin_user) break;
3425     }
3426   }
3427
3428 /* Another group of privileged users are the trusted users. These are root,
3429 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3430 are permitted to specify sender_addresses with -f on the command line, and
3431 other message parameters as well. */
3432
3433 if (real_uid == root_uid || real_uid == exim_uid)
3434   trusted_caller = TRUE;
3435 else
3436   {
3437   int i, j;
3438
3439   if (trusted_users != NULL)
3440     {
3441     for (i = 1; i <= (int)(trusted_users[0]); i++)
3442       if (trusted_users[i] == real_uid)
3443         { trusted_caller = TRUE; break; }
3444     }
3445
3446   if (!trusted_caller && trusted_groups != NULL)
3447     {
3448     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3449       {
3450       if (trusted_groups[i] == real_gid)
3451         trusted_caller = TRUE;
3452       else for (j = 0; j < group_count; j++)
3453         {
3454         if (trusted_groups[i] == group_list[j])
3455           { trusted_caller = TRUE; break; }
3456         }
3457       if (trusted_caller) break;
3458       }
3459     }
3460   }
3461
3462 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3463 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3464
3465 /* Only an admin user may start the daemon or force a queue run in the default
3466 configuration, but the queue run restriction can be relaxed. Only an admin
3467 user may request that a message be returned to its sender forthwith. Only an
3468 admin user may specify a debug level greater than D_v (because it might show
3469 passwords, etc. in lookup queries). Only an admin user may request a queue
3470 count. */
3471
3472 if (!admin_user)
3473   {
3474   BOOL debugset = (debug_selector & ~D_v) != 0;
3475   if (deliver_give_up || daemon_listen ||
3476      (count_queue && queue_list_requires_admin) ||
3477      (list_queue && queue_list_requires_admin) ||
3478      (queue_interval >= 0 && prod_requires_admin) ||
3479      (debugset && !running_in_test_harness))
3480     {
3481     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3482     exit(EXIT_FAILURE);
3483     }
3484   }
3485
3486 /* If the real user is not root or the exim uid, the argument for passing
3487 in an open TCP/IP connection for another message is not permitted, nor is
3488 running with the -N option for any delivery action, unless this call to exim is
3489 one that supplied an input message, or we are using a patched exim for
3490 regression testing. */
3491
3492 if (real_uid != root_uid && real_uid != exim_uid &&
3493      (continue_hostname != NULL ||
3494        (dont_deliver &&
3495          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3496        )) && !running_in_test_harness)
3497   {
3498   fprintf(stderr, "exim: Permission denied\n");
3499   return EXIT_FAILURE;
3500   }
3501
3502 /* If the caller is not trusted, certain arguments are ignored when running for
3503 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3504 Note that authority for performing certain actions on messages is tested in the
3505 queue_action() function. */
3506
3507 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3508   {
3509   sender_host_name = sender_host_address = interface_address =
3510     sender_ident = received_protocol = NULL;
3511   sender_host_port = interface_port = 0;
3512   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3513   }
3514
3515 /* If a sender host address is set, extract the optional port number off the
3516 end of it and check its syntax. Do the same thing for the interface address.
3517 Exim exits if the syntax is bad. */
3518
3519 else
3520   {
3521   if (sender_host_address != NULL)
3522     sender_host_port = check_port(sender_host_address);
3523   if (interface_address != NULL)
3524     interface_port = check_port(interface_address);
3525   }
3526
3527 /* If an SMTP message is being received check to see if the standard input is a
3528 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3529 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3530 barf. */
3531
3532 if (smtp_input)
3533   {
3534   union sockaddr_46 inetd_sock;
3535   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3536   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3537     {
3538     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3539     if (family == AF_INET || family == AF_INET6)
3540       {
3541       union sockaddr_46 interface_sock;
3542       size = sizeof(interface_sock);
3543
3544       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3545         interface_address = host_ntoa(-1, &interface_sock, NULL,
3546           &interface_port);
3547
3548       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3549
3550       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3551         {
3552         is_inetd = TRUE;
3553         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3554           NULL, &sender_host_port);
3555         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3556           "inetd is not supported when mua_wrapper is set");
3557         }
3558       else
3559         {
3560         fprintf(stderr,
3561           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3562         return EXIT_FAILURE;
3563         }
3564       }
3565     }
3566   }
3567
3568 /* If the load average is going to be needed while receiving a message, get it
3569 now for those OS that require the first call to os_getloadavg() to be done as
3570 root. There will be further calls later for each message received. */
3571
3572 #ifdef LOAD_AVG_NEEDS_ROOT
3573 if (receiving_message &&
3574       (queue_only_load >= 0 ||
3575         (is_inetd && smtp_load_reserve >= 0)
3576       ))
3577   {
3578   load_average = os_getloadavg();
3579   }
3580 #endif
3581
3582 /* The queue_only configuration option can be overridden by -odx on the command
3583 line, except that if queue_only_override is false, queue_only cannot be unset
3584 from the command line. */
3585
3586 if (queue_only_set && (queue_only_override || arg_queue_only))
3587   queue_only = arg_queue_only;
3588
3589 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3590 -or and -os. */
3591
3592 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3593 if (arg_smtp_receive_timeout >= 0)
3594   smtp_receive_timeout = arg_smtp_receive_timeout;
3595
3596 /* If Exim was started with root privilege, unless we have already removed the
3597 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3598 except when starting the daemon or doing some kind of delivery or address
3599 testing (-bt). These are the only cases when root need to be retained. We run
3600 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3601 retained only for starting the daemon. */
3602
3603 if (!unprivileged &&                      /* originally had root AND */
3604     !removed_privilege &&                 /* still got root AND      */
3605     !daemon_listen &&                     /* not starting the daemon */
3606     queue_interval <= 0 &&                /* (either kind of daemon) */
3607       (                                   /*    AND EITHER           */
3608       deliver_drop_privilege ||           /* requested unprivileged  */
3609         (                                 /*       OR                */
3610         queue_interval < 0 &&             /* not running the queue   */
3611         (msg_action_arg < 0 ||            /*       and               */
3612           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3613         (!checking || !address_test_mode) /* not address checking    */
3614         )
3615       ))
3616   {
3617   exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3618   }
3619
3620 /* When we are retaining a privileged uid, we still change to the exim gid. */
3621
3622 else setgid(exim_gid);
3623
3624 /* Handle a request to list the delivery queue */
3625
3626 if (list_queue)
3627   {
3628   set_process_info("listing the queue");
3629   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3630   exit(EXIT_SUCCESS);
3631   }
3632
3633 /* Handle a request to count the delivery queue */
3634
3635 if (count_queue)
3636   {
3637   set_process_info("counting the queue");
3638   queue_count();
3639   exit(EXIT_SUCCESS);
3640   }
3641
3642 /* Handle actions on specific messages, except for the force delivery action,
3643 which is done below. Some actions take a whole list of message ids, which
3644 are known to continue up to the end of the arguments. Others take a single
3645 message id and then operate on the recipients list. */
3646
3647 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3648   {
3649   int yield = EXIT_SUCCESS;
3650   set_process_info("acting on specified messages");
3651
3652   if (!one_msg_action)
3653     {
3654     for (i = msg_action_arg; i < argc; i++)
3655       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3656         yield = EXIT_FAILURE;
3657     }
3658
3659   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3660     recipients_arg)) yield = EXIT_FAILURE;
3661   exit(yield);
3662   }
3663
3664 /* All the modes below here require the remaining configuration sections
3665 to be read, except that we can skip over the ACL setting when delivering
3666 specific messages, or doing a queue run. (For various testing cases we could
3667 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3668 for skipping. */
3669
3670 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3671
3672 /* The configuration data will have been read into POOL_PERM because we won't
3673 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3674 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3675 configuration were read into POOL_MAIN, because we don't do any resets till
3676 later on. However, it seems right, and it does ensure that both pools get used.
3677 */
3678
3679 store_pool = POOL_MAIN;
3680
3681 /* Handle the -brt option. This is for checking out retry configurations.
3682 The next three arguments are a domain name or a complete address, and
3683 optionally two error numbers. All it does is to call the function that
3684 scans the retry configuration data. */
3685
3686 if (test_retry_arg >= 0)
3687   {
3688   retry_config *yield;
3689   int basic_errno = 0;
3690   int more_errno = 0;
3691   uschar *s1, *s2;
3692
3693   if (test_retry_arg >= argc)
3694     {
3695     printf("-brt needs a domain or address argument\n");
3696     exim_exit(EXIT_FAILURE);
3697     }
3698   s1 = argv[test_retry_arg++];
3699   s2 = NULL;
3700
3701   /* If the first argument contains no @ and no . it might be a local user
3702   or it might be a single-component name. Treat as a domain. */
3703
3704   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3705     {
3706     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3707       "being \ntreated as a one-component domain, not as a local part.\n\n",
3708       s1);
3709     }
3710
3711   /* There may be an optional second domain arg. */
3712
3713   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3714     s2 = argv[test_retry_arg++];
3715
3716   /* The final arg is an error name */
3717
3718   if (test_retry_arg < argc)
3719     {
3720     uschar *ss = argv[test_retry_arg];
3721     uschar *error =
3722       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3723     if (error != NULL)
3724       {
3725       printf("%s\n", CS error);
3726       return EXIT_FAILURE;
3727       }
3728
3729     /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3730     an error is for matching codes to the decade. Turn them into a real error
3731     code, off the decade. */
3732
3733     if (basic_errno == ERRNO_RCPT4XX)
3734       {
3735       int code = (more_errno >> 8) & 255;
3736       if (code == 255)
3737         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3738       else if (code > 100)
3739         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3740       }
3741     }
3742
3743   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3744   if (yield == NULL) printf("No retry information found\n"); else
3745     {
3746     retry_rule *r;
3747     more_errno = yield->more_errno;
3748     printf("Retry rule: %s  ", yield->pattern);
3749
3750     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3751       {
3752       printf("quota%s%s  ",
3753         (more_errno > 0)? "_" : "",
3754         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3755       }
3756     else if (yield->basic_errno == ECONNREFUSED)
3757       {
3758       printf("refused%s%s  ",
3759         (more_errno > 0)? "_" : "",
3760         (more_errno == 'M')? "MX" :
3761         (more_errno == 'A')? "A" : "");
3762       }
3763     else if (yield->basic_errno == ETIMEDOUT)
3764       {
3765       printf("timeout");
3766       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3767       more_errno &= 255;
3768       if (more_errno != 0) printf("_%s",
3769         (more_errno == 'M')? "MX" : "A");
3770       printf("  ");
3771       }
3772     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3773       printf("auth_failed  ");
3774     else printf("*  ");
3775
3776     for (r = yield->rules; r != NULL; r = r->next)
3777       {
3778       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3779       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3780       if (r->rule == 'G')
3781         {
3782         int x = r->p2;
3783         int f = x % 1000;
3784         int d = 100;
3785         printf(",%d.", x/1000);
3786         do
3787           {
3788           printf("%d", f/d);
3789           f %= d;
3790           d /= 10;
3791           }
3792         while (f != 0);
3793         }
3794       printf("; ");
3795       }
3796
3797     printf("\n");
3798     }
3799   exim_exit(EXIT_SUCCESS);
3800   }
3801
3802 /* Handle a request to list one or more configuration options */
3803
3804 if (list_options)
3805   {
3806   set_process_info("listing variables");
3807   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3808     else for (i = recipients_arg; i < argc; i++)
3809       {
3810       if (i < argc - 1 &&
3811           (Ustrcmp(argv[i], "router") == 0 ||
3812            Ustrcmp(argv[i], "transport") == 0 ||
3813            Ustrcmp(argv[i], "authenticator") == 0))
3814         {
3815         readconf_print(argv[i+1], argv[i]);
3816         i++;
3817         }
3818       else readconf_print(argv[i], NULL);
3819       }
3820   exim_exit(EXIT_SUCCESS);
3821   }
3822
3823
3824 /* Handle a request to deliver one or more messages that are already on the
3825 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3826 is typically used for a small number when prodding by hand (when the option
3827 forced_delivery will be set) or when re-execing to regain root privilege.
3828 Each message delivery must happen in a separate process, so we fork a process
3829 for each one, and run them sequentially so that debugging output doesn't get
3830 intertwined, and to avoid spawning too many processes if a long list is given.
3831 However, don't fork for the last one; this saves a process in the common case
3832 when Exim is called to deliver just one message. */
3833
3834 if (msg_action_arg > 0)
3835   {
3836   if (prod_requires_admin && !admin_user)
3837     {
3838     fprintf(stderr, "exim: Permission denied\n");
3839     exim_exit(EXIT_FAILURE);
3840     }
3841   set_process_info("delivering specified messages");
3842   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3843   for (i = msg_action_arg; i < argc; i++)
3844     {
3845     int status;
3846     pid_t pid;
3847     if (i == argc - 1)
3848       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3849     else if ((pid = fork()) == 0)
3850       {
3851       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3852       _exit(EXIT_SUCCESS);
3853       }
3854     else if (pid < 0)
3855       {
3856       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3857         strerror(errno));
3858       exim_exit(EXIT_FAILURE);
3859       }
3860     else wait(&status);
3861     }
3862   exim_exit(EXIT_SUCCESS);
3863   }
3864
3865
3866 /* If only a single queue run is requested, without SMTP listening, we can just
3867 turn into a queue runner, with an optional starting message id. */
3868
3869 if (queue_interval == 0 && !daemon_listen)
3870   {
3871   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3872     (start_queue_run_id == NULL)? US"" : US" starting at ",
3873     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3874     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3875     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3876   set_process_info("running the queue (single queue run)");
3877   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3878   exim_exit(EXIT_SUCCESS);
3879   }
3880
3881
3882 /* Find the login name of the real user running this process. This is always
3883 needed when receiving a message, because it is written into the spool file. It
3884 may also be used to construct a from: or a sender: header, and in this case we
3885 need the user's full name as well, so save a copy of it, checked for RFC822
3886 syntax and munged if necessary, if it hasn't previously been set by the -F
3887 argument. We may try to get the passwd entry more than once, in case NIS or
3888 other delays are in evidence. Save the home directory for use in filter testing
3889 (only). */
3890
3891 for (i = 0;;)
3892   {
3893   if ((pw = getpwuid(real_uid)) != NULL)
3894     {
3895     originator_login = string_copy(US pw->pw_name);
3896     originator_home = string_copy(US pw->pw_dir);
3897
3898     /* If user name has not been set by -F, set it from the passwd entry
3899     unless -f has been used to set the sender address by a trusted user. */
3900
3901     if (originator_name == NULL)
3902       {
3903       if (sender_address == NULL ||
3904            (!trusted_caller && filter_test == FTEST_NONE))
3905         {
3906         uschar *name = US pw->pw_gecos;
3907         uschar *amp = Ustrchr(name, '&');
3908         uschar buffer[256];
3909
3910         /* Most Unix specify that a '&' character in the gecos field is
3911         replaced by a copy of the login name, and some even specify that
3912         the first character should be upper cased, so that's what we do. */
3913
3914         if (amp != NULL)
3915           {
3916           int loffset;
3917           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3918             amp - name, name, &loffset, originator_login, amp + 1);
3919           buffer[loffset] = toupper(buffer[loffset]);
3920           name = buffer;
3921           }
3922
3923         /* If a pattern for matching the gecos field was supplied, apply
3924         it and then expand the name string. */
3925
3926         if (gecos_pattern != NULL && gecos_name != NULL)
3927           {
3928           const pcre *re;
3929           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3930
3931           if (regex_match_and_setup(re, name, 0, -1))
3932             {
3933             uschar *new_name = expand_string(gecos_name);
3934             expand_nmax = -1;
3935             if (new_name != NULL)
3936               {
3937               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3938                 "gecos field \"%s\"\n", new_name, name);
3939               name = new_name;
3940               }
3941             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3942               "\"%s\": %s\n", gecos_name, expand_string_message);
3943             }
3944           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3945             "gecos field \"%s\"\n", gecos_pattern, name);
3946           store_free((void *)re);
3947           }
3948         originator_name = string_copy(name);
3949         }
3950
3951       /* A trusted caller has used -f but not -F */
3952
3953       else originator_name = US"";
3954       }
3955
3956     /* Break the retry loop */
3957
3958     break;
3959     }
3960
3961   if (++i > finduser_retries) break;
3962   sleep(1);
3963   }
3964
3965 /* If we cannot get a user login, log the incident and give up, unless the
3966 configuration specifies something to use. When running in the test harness,
3967 any setting of unknown_login overrides the actual name. */
3968
3969 if (originator_login == NULL || running_in_test_harness)
3970   {
3971   if (unknown_login != NULL)
3972     {
3973     originator_login = expand_string(unknown_login);
3974     if (originator_name == NULL && unknown_username != NULL)
3975       originator_name = expand_string(unknown_username);
3976     if (originator_name == NULL) originator_name = US"";
3977     }
3978   if (originator_login == NULL)
3979     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3980       (int)real_uid);
3981   }
3982
3983 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3984 RFC822 address.*/
3985
3986 originator_name = string_copy(parse_fix_phrase(originator_name,
3987   Ustrlen(originator_name), big_buffer, big_buffer_size));
3988
3989 /* If a message is created by this call of Exim, the uid/gid of its originator
3990 are those of the caller. These values are overridden if an existing message is
3991 read in from the spool. */
3992
3993 originator_uid = real_uid;
3994 originator_gid = real_gid;
3995
3996 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3997   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3998
3999 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4000 returns. We leave this till here so that the originator_ fields are available
4001 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4002 mode. */
4003
4004 if (daemon_listen || queue_interval > 0)
4005   {
4006   if (mua_wrapper)
4007     {
4008     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4009     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4010       "mua_wrapper is set");
4011     }
4012   daemon_go();
4013   }
4014
4015 /* If the sender ident has not been set (by a trusted caller) set it to
4016 the caller. This will get overwritten below for an inetd call. If a trusted
4017 caller has set it empty, unset it. */
4018
4019 if (sender_ident == NULL) sender_ident = originator_login;
4020   else if (sender_ident[0] == 0) sender_ident = NULL;
4021
4022 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4023 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4024 originator_* variables set. */
4025
4026 if (test_rewrite_arg >= 0)
4027   {
4028   really_exim = FALSE;
4029   if (test_rewrite_arg >= argc)
4030     {
4031     printf("-brw needs an address argument\n");
4032     exim_exit(EXIT_FAILURE);
4033     }
4034   rewrite_test(argv[test_rewrite_arg]);
4035   exim_exit(EXIT_SUCCESS);
4036   }
4037
4038 /* A locally-supplied message is considered to be coming from a local user
4039 unless a trusted caller supplies a sender address with -f, or is passing in the
4040 message via SMTP (inetd invocation or otherwise). */
4041
4042 if ((sender_address == NULL && !smtp_input) ||
4043     (!trusted_caller && filter_test == FTEST_NONE))
4044   {
4045   sender_local = TRUE;
4046
4047   /* A trusted caller can supply authenticated_sender and authenticated_id
4048   via -oMas and -oMai and if so, they will already be set. */
4049
4050   if (authenticated_sender == NULL)
4051     authenticated_sender = string_sprintf("%s@%s", originator_login,
4052       qualify_domain_sender);
4053   if (authenticated_id == NULL) authenticated_id = originator_login;
4054   }
4055
4056 /* Trusted callers are always permitted to specify the sender address.
4057 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4058 is specified is the empty address. However, if a trusted caller does not
4059 specify a sender address for SMTP input, we leave sender_address unset. This
4060 causes the MAIL commands to be honoured. */
4061
4062 if ((!smtp_input && sender_address == NULL) ||
4063     !receive_check_set_sender(sender_address))
4064   {
4065   /* Either the caller is not permitted to set a general sender, or this is
4066   non-SMTP input and the trusted caller has not set a sender. If there is no
4067   sender, or if a sender other than <> is set, override with the originator's
4068   login (which will get qualified below), except when checking things. */
4069
4070   if (sender_address == NULL             /* No sender_address set */
4071        ||                                /*         OR            */
4072        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4073        !checking &&                      /* Not running tests, AND */
4074        filter_test == FTEST_NONE))       /* Not testing a filter */
4075     {
4076     sender_address = originator_login;
4077     sender_address_forced = FALSE;
4078     sender_address_domain = 0;
4079     }
4080   }
4081
4082 /* Remember whether an untrusted caller set the sender address */
4083
4084 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4085
4086 /* Ensure that the sender address is fully qualified unless it is the empty
4087 address, which indicates an error message, or doesn't exist (root caller, smtp
4088 interface, no -f argument). */
4089
4090 if (sender_address != NULL && sender_address[0] != 0 &&
4091     sender_address_domain == 0)
4092   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4093     qualify_domain_sender);
4094
4095 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4096
4097 /* Handle a request to verify a list of addresses, or test them for delivery.
4098 This must follow the setting of the sender address, since routers can be
4099 predicated upon the sender. If no arguments are given, read addresses from
4100 stdin. Set debug_level to at least D_v to get full output for address testing.
4101 */
4102
4103 if (verify_address_mode || address_test_mode)
4104   {
4105   int exit_value = 0;
4106   int flags = vopt_qualify;
4107
4108   if (verify_address_mode)
4109     {
4110     if (!verify_as_sender) flags |= vopt_is_recipient;
4111     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4112     }
4113
4114   else
4115     {
4116     flags |= vopt_is_recipient;
4117     debug_selector |= D_v;
4118     debug_file = stderr;
4119     debug_fd = fileno(debug_file);
4120     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4121     }
4122
4123   if (recipients_arg < argc)
4124     {
4125     while (recipients_arg < argc)
4126       {
4127       uschar *s = argv[recipients_arg++];
4128       while (*s != 0)
4129         {
4130         BOOL finished = FALSE;
4131         uschar *ss = parse_find_address_end(s, FALSE);
4132         if (*ss == ',') *ss = 0; else finished = TRUE;
4133         test_address(s, flags, &exit_value);
4134         s = ss;
4135         if (!finished)
4136           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4137         }
4138       }
4139     }
4140
4141   else for (;;)
4142     {
4143     uschar *s = get_stdinput(NULL, NULL);
4144     if (s == NULL) break;
4145     test_address(s, flags, &exit_value);
4146     }
4147
4148   route_tidyup();
4149   exim_exit(exit_value);
4150   }
4151
4152 /* Handle expansion checking */
4153
4154 if (expansion_test)
4155   {
4156   if (recipients_arg < argc)
4157     {
4158     while (recipients_arg < argc)
4159       {
4160       uschar *s = argv[recipients_arg++];
4161       uschar *ss = expand_string(s);
4162       if (ss == NULL)
4163         printf ("Failed: %s\n", expand_string_message);
4164       else printf("%s\n", CS ss);
4165       }
4166     }
4167
4168   /* Read stdin */
4169
4170   else
4171     {
4172     char *(*fn_readline)(char *) = NULL;
4173     char *(*fn_addhist)(char *) = NULL;
4174
4175     #ifdef USE_READLINE
4176     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4177     #endif
4178
4179     for (;;)
4180       {
4181       uschar *ss;
4182       uschar *source = get_stdinput(fn_readline, fn_addhist);
4183       if (source == NULL) break;
4184       ss = expand_string(source);
4185       if (ss == NULL)
4186         printf ("Failed: %s\n", expand_string_message);
4187       else printf("%s\n", CS ss);
4188       }
4189
4190     #ifdef USE_READLINE
4191     if (dlhandle != NULL) dlclose(dlhandle);
4192     #endif
4193     }
4194
4195   exim_exit(EXIT_SUCCESS);
4196   }
4197
4198
4199 /* The active host name is normally the primary host name, but it can be varied
4200 for hosts that want to play several parts at once. We need to ensure that it is
4201 set for host checking, and for receiving messages. */
4202
4203 smtp_active_hostname = primary_hostname;
4204 if (raw_active_hostname != NULL)
4205   {
4206   uschar *nah = expand_string(raw_active_hostname);
4207   if (nah == NULL)
4208     {
4209     if (!expand_string_forcedfail)
4210       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4211         "(smtp_active_hostname): %s", raw_active_hostname,
4212         expand_string_message);
4213     }
4214   else if (nah[0] != 0) smtp_active_hostname = nah;
4215   }
4216
4217 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4218 given IP address so that the blocking and relay configuration can be tested. An
4219 RFC 1413 call is made only if we are running in the test harness and an
4220 incoming interface and both ports are specified, because there is no TCP/IP
4221 call to find the ident for. */
4222
4223 if (host_checking)
4224   {
4225   int x[4];
4226   int size;
4227
4228   sender_ident = NULL;
4229   if (running_in_test_harness && sender_host_port != 0 &&
4230       interface_address != NULL && interface_port != 0)
4231     verify_get_ident(1413);
4232
4233   /* In case the given address is a non-canonical IPv6 address, canonicize
4234   it. The code works for both IPv4 and IPv6, as it happens. */
4235
4236   size = host_aton(sender_host_address, x);
4237   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4238   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4239
4240   /* Now set up for testing */
4241
4242   host_build_sender_fullhost();
4243   smtp_input = TRUE;
4244   smtp_in = stdin;
4245   smtp_out = stdout;
4246   sender_local = FALSE;
4247   sender_host_notsocket = TRUE;
4248   debug_file = stderr;
4249   debug_fd = fileno(debug_file);
4250   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4251     "**** but without any ident (RFC 1413) callback.\n"
4252     "**** This is not for real!\n\n",
4253       sender_host_address);
4254
4255   if (verify_check_host(&hosts_connection_nolog) == OK)
4256     log_write_selector &= ~L_smtp_connection;
4257   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4258
4259   if (smtp_start_session())
4260     {
4261     reset_point = store_get(0);
4262     for (;;)
4263       {
4264       store_reset(reset_point);
4265       if (smtp_setup_msg() <= 0) break;
4266       if (!receive_msg(FALSE)) break;
4267       }
4268     }
4269   exim_exit(EXIT_SUCCESS);
4270   }
4271
4272
4273 /* Arrange for message reception if recipients or SMTP were specified;
4274 otherwise complain unless a version print (-bV) happened or this is a filter
4275 verification test. In the former case, show the configuration file name. */
4276
4277 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4278   {
4279   if (version_printed)
4280     {
4281     printf("Configuration file is %s\n", config_main_filename);
4282     return EXIT_SUCCESS;
4283     }
4284   if (filter_test == FTEST_NONE)
4285     {
4286     fprintf(stderr,
4287 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4288 "not directly from a shell command line. Options and/or arguments control\n"
4289 "what it does when called. For a list of options, see the Exim documentation.\n");
4290     return EXIT_FAILURE;
4291     }
4292   }
4293
4294
4295 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4296 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4297 that we are not called from inetd, because that is rejected above. The
4298 following configuration settings are forced here:
4299
4300   (1) Synchronous delivery (-odi)
4301   (2) Errors to stderr (-oep == -oeq)
4302   (3) No parallel remote delivery
4303   (4) Unprivileged delivery
4304
4305 We don't force overall queueing options because there are several of them;
4306 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4307 to override any SMTP queueing. */
4308
4309 if (mua_wrapper)
4310   {
4311   synchronous_delivery = TRUE;
4312   arg_error_handling = ERRORS_STDERR;
4313   remote_max_parallel = 1;
4314   deliver_drop_privilege = TRUE;
4315   queue_smtp = FALSE;
4316   queue_smtp_domains = NULL;
4317   }
4318
4319
4320 /* Prepare to accept one or more new messages on the standard input. When a
4321 message has been read, its id is returned in message_id[]. If doing immediate
4322 delivery, we fork a delivery process for each received message, except for the
4323 last one, where we can save a process switch.
4324
4325 It is only in non-smtp mode that error_handling is allowed to be changed from
4326 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4327 sendmail error modes other than -oem ever actually used? Later: yes.) */
4328
4329 if (!smtp_input) error_handling = arg_error_handling;
4330
4331 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4332 logging being sent down the socket and make an identd call to get the
4333 sender_ident. */
4334
4335 else if (is_inetd)
4336   {
4337   (void)fclose(stderr);
4338   exim_nullstd();                       /* Re-open to /dev/null */
4339   verify_get_ident(IDENT_PORT);
4340   host_build_sender_fullhost();
4341   set_process_info("handling incoming connection from %s via inetd",
4342     sender_fullhost);
4343   }
4344
4345 /* If the sender host address has been set, build sender_fullhost if it hasn't
4346 already been done (which it will have been for inetd). This caters for the
4347 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4348 so that the test for IP options is skipped for -bs input. */
4349
4350 if (sender_host_address != NULL && sender_fullhost == NULL)
4351   {
4352   host_build_sender_fullhost();
4353   set_process_info("handling incoming connection from %s via -oMa",
4354     sender_fullhost);
4355   sender_host_notsocket = TRUE;
4356   }
4357
4358 /* Otherwise, set the sender host as unknown except for inetd calls. This
4359 prevents host checking in the case of -bs not from inetd and also for -bS. */
4360
4361 else if (!is_inetd) sender_host_unknown = TRUE;
4362
4363 /* If stdout does not exist, then dup stdin to stdout. This can happen
4364 if exim is started from inetd. In this case fd 0 will be set to the socket,
4365 but fd 1 will not be set. This also happens for passed SMTP channels. */
4366
4367 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4368
4369 /* Set up the incoming protocol name and the state of the program. Root
4370 is allowed to force received protocol via the -oMr option above, and if we are
4371 in a non-local SMTP state it means we have come via inetd and the process info
4372 has already been set up. We don't set received_protocol here for smtp input,
4373 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4374
4375 if (smtp_input)
4376   {
4377   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4378     sender_address);
4379   }
4380 else
4381   {
4382   if (received_protocol == NULL)
4383     received_protocol = string_sprintf("local%s", called_as);
4384   set_process_info("accepting a local non-SMTP message from <%s>",
4385     sender_address);
4386   }
4387
4388 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4389 set) */
4390
4391 queue_check_only();
4392 local_queue_only = queue_only;
4393
4394 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4395 the spool if so configured. On failure, we must not attempt to send an error
4396 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4397 error code is given.) */
4398
4399 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4400   {
4401   fprintf(stderr, "exim: insufficient disk space\n");
4402   return EXIT_FAILURE;
4403   }
4404
4405 /* If this is smtp input of any kind, handle the start of the SMTP
4406 session. */
4407
4408 if (smtp_input)
4409   {
4410   smtp_in = stdin;
4411   smtp_out = stdout;
4412   if (verify_check_host(&hosts_connection_nolog) == OK)
4413     log_write_selector &= ~L_smtp_connection;
4414   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4415   if (!smtp_start_session())
4416     {
4417     mac_smtp_fflush();
4418     exim_exit(EXIT_SUCCESS);
4419     }
4420   }
4421
4422 /* Otherwise, set up the input size limit here */
4423
4424 else
4425   {
4426   thismessage_size_limit = expand_string_integer(message_size_limit);
4427   if (thismessage_size_limit < 0)
4428     {
4429     if (thismessage_size_limit == -1)
4430       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4431         "message_size_limit: %s", expand_string_message);
4432     else
4433       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4434         "message_size_limit: %s", expand_string_message);
4435     }
4436   }
4437
4438 /* Loop for several messages when reading SMTP input. If we fork any child
4439 processes, we don't want to wait for them unless synchronous delivery is
4440 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4441 same as SIG_DFL, despite the fact that documentation often lists the default as
4442 "ignore". This is a confusing area. This is what I know:
4443
4444 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4445 processes that complete simply to go away without ever becoming defunct. You
4446 can't then wait for them - but we don't want to wait for them in the
4447 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4448 happen for all OS (e.g. *BSD is different).
4449
4450 But that's not the end of the story. Some (many? all?) systems have the
4451 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4452 has by default, so it seems that the difference is merely one of default
4453 (compare restarting vs non-restarting signals).
4454
4455 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4456 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4457 of the loop below. Paranoia rules.
4458
4459 February 2003: That's *still* not the end of the story. There are now versions
4460 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4461 process then calls waitpid(), a grumble is written to the system log, because
4462 this is logically inconsistent. In other words, it doesn't like the paranoia.
4463 As a consequenc of this, the waitpid() below is now excluded if we are sure
4464 that SIG_IGN works. */
4465
4466 if (!synchronous_delivery)
4467   {
4468   #ifdef SA_NOCLDWAIT
4469   struct sigaction act;
4470   act.sa_handler = SIG_IGN;
4471   sigemptyset(&(act.sa_mask));
4472   act.sa_flags = SA_NOCLDWAIT;
4473   sigaction(SIGCHLD, &act, NULL);
4474   #else
4475   signal(SIGCHLD, SIG_IGN);
4476   #endif
4477   }
4478
4479 /* Save the current store pool point, for resetting at the start of
4480 each message, and save the real sender address, if any. */
4481
4482 reset_point = store_get(0);
4483 real_sender_address = sender_address;
4484
4485 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4486 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4487 collapsed). */
4488
4489 while (more)
4490   {
4491   store_reset(reset_point);
4492   message_id[0] = 0;
4493
4494   /* In the SMTP case, we have to handle the initial SMTP input and build the
4495   recipients list, before calling receive_msg() to read the message proper.
4496   Whatever sender address is actually given in the SMTP transaction is
4497   actually ignored for local senders - we use the actual sender, which is
4498   normally either the underlying user running this process or a -f argument
4499   provided by a trusted caller. It is saved in real_sender_address.
4500
4501   However, if this value is NULL, we are dealing with a trusted caller when
4502   -f was not used; in this case, the SMTP sender is allowed to stand.
4503
4504   Also, if untrusted_set_sender is set, we permit sender addresses that match
4505   anything in its list.
4506
4507   The variable raw_sender_address holds the sender address before rewriting. */
4508
4509   if (smtp_input)
4510     {
4511     int rc;
4512     if ((rc = smtp_setup_msg()) > 0)
4513       {
4514       if (real_sender_address != NULL &&
4515           !receive_check_set_sender(sender_address))
4516         {
4517         sender_address = raw_sender = real_sender_address;
4518         sender_address_unrewritten = NULL;
4519         }
4520       more = receive_msg(extract_recipients);
4521       if (message_id[0] == 0)
4522         {
4523         if (more) continue;
4524         exim_exit(EXIT_FAILURE);
4525         }
4526       }
4527     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4528     }
4529
4530   /* In the non-SMTP case, we have all the information from the command
4531   line, but must process it in case it is in the more general RFC822
4532   format, and in any case, to detect syntax errors. Also, it appears that
4533   the use of comma-separated lists as single arguments is common, so we
4534   had better support them. */
4535
4536   else
4537     {
4538     int i;
4539     int rcount = 0;
4540     int count = argc - recipients_arg;
4541     uschar **list = argv + recipients_arg;
4542
4543     /* These options cannot be changed dynamically for non-SMTP messages */
4544
4545     active_local_sender_retain = local_sender_retain;
4546     active_local_from_check = local_from_check;
4547
4548     /* Save before any rewriting */
4549
4550     raw_sender = string_copy(sender_address);
4551
4552     /* Loop for each argument */
4553
4554     for (i = 0; i < count; i++)
4555       {
4556       int start, end, domain;
4557       uschar *errmess;
4558       uschar *s = list[i];
4559
4560       /* Loop for each comma-separated address */
4561
4562       while (*s != 0)
4563         {
4564         BOOL finished = FALSE;
4565         uschar *recipient;
4566         uschar *ss = parse_find_address_end(s, FALSE);
4567
4568         if (*ss == ',') *ss = 0; else finished = TRUE;
4569
4570         /* Check max recipients - if -t was used, these aren't recipients */
4571
4572         if (recipients_max > 0 && ++rcount > recipients_max &&
4573             !extract_recipients)
4574           {
4575           if (error_handling == ERRORS_STDERR)
4576             {
4577             fprintf(stderr, "exim: too many recipients\n");
4578             exim_exit(EXIT_FAILURE);
4579             }
4580           else
4581             {
4582             return
4583               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4584                 errors_sender_rc : EXIT_FAILURE;
4585             }
4586           }
4587
4588         recipient =
4589           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4590
4591         if (domain == 0 && !allow_unqualified_recipient)
4592           {
4593           recipient = NULL;
4594           errmess = US"unqualified recipient address not allowed";
4595           }
4596
4597         if (recipient == NULL)
4598           {
4599           if (error_handling == ERRORS_STDERR)
4600             {
4601             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4602               string_printing(list[i]), errmess);
4603             exim_exit(EXIT_FAILURE);
4604             }
4605           else
4606             {
4607             error_block eblock;
4608             eblock.next = NULL;
4609             eblock.text1 = string_printing(list[i]);
4610             eblock.text2 = errmess;
4611             return
4612               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4613                 errors_sender_rc : EXIT_FAILURE;
4614             }
4615           }
4616
4617         receive_add_recipient(recipient, -1);
4618         s = ss;
4619         if (!finished)
4620           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4621         }
4622       }
4623
4624     /* Show the recipients when debugging */
4625
4626     DEBUG(D_receive)
4627       {
4628       int i;
4629       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4630       if (recipients_list != NULL)
4631         {
4632         debug_printf("Recipients:\n");
4633         for (i = 0; i < recipients_count; i++)
4634           debug_printf("  %s\n", recipients_list[i].address);
4635         }
4636       }
4637
4638     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4639     will just read the headers for the message, and not write anything onto the
4640     spool. */
4641
4642     message_ended = END_NOTENDED;
4643     more = receive_msg(extract_recipients);
4644
4645     /* more is always FALSE here (not SMTP message) when reading a message
4646     for real; when reading the headers of a message for filter testing,
4647     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4648
4649     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4650     }  /* Non-SMTP message reception */
4651
4652   /* If this is a filter testing run, there are headers in store, but
4653   no message on the spool. Run the filtering code in testing mode, setting
4654   the domain to the qualify domain and the local part to the current user,
4655   unless they have been set by options. The prefix and suffix are left unset
4656   unless specified. The the return path is set to to the sender unless it has
4657   already been set from a return-path header in the message. */
4658
4659   if (filter_test != FTEST_NONE)
4660     {
4661     deliver_domain = (ftest_domain != NULL)?
4662       ftest_domain : qualify_domain_recipient;
4663     deliver_domain_orig = deliver_domain;
4664     deliver_localpart = (ftest_localpart != NULL)?
4665       ftest_localpart : originator_login;
4666     deliver_localpart_orig = deliver_localpart;
4667     deliver_localpart_prefix = ftest_prefix;
4668     deliver_localpart_suffix = ftest_suffix;
4669     deliver_home = originator_home;
4670
4671     if (return_path == NULL)
4672       {
4673       printf("Return-path copied from sender\n");
4674       return_path = string_copy(sender_address);
4675       }
4676     else
4677       {
4678       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4679       }
4680     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4681
4682     receive_add_recipient(
4683       string_sprintf("%s%s%s@%s",
4684         (ftest_prefix == NULL)? US"" : ftest_prefix,
4685         deliver_localpart,
4686         (ftest_suffix == NULL)? US"" : ftest_suffix,
4687         deliver_domain), -1);
4688
4689     printf("Recipient   = %s\n", recipients_list[0].address);
4690     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4691     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4692
4693     (void)chdir("/");   /* Get away from wherever the user is running this from */
4694
4695     /* Now we run either a system filter test, or a user filter test, or both.
4696     In the latter case, headers added by the system filter will persist and be
4697     available to the user filter. We need to copy the filter variables
4698     explicitly. */
4699
4700     if ((filter_test & FTEST_SYSTEM) != 0)
4701       {
4702       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4703         exim_exit(EXIT_FAILURE);
4704       }
4705
4706     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4707
4708     if ((filter_test & FTEST_USER) != 0)
4709       {
4710       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4711         exim_exit(EXIT_FAILURE);
4712       }
4713
4714     exim_exit(EXIT_SUCCESS);
4715     }
4716
4717   /* Else act on the result of message reception. We should not get here unless
4718   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4719   TRUE. If it is not, check on the number of messages received in this
4720   connection. If that's OK and queue_only_load is set, check that the load
4721   average is below it. If it is not, set local_queue_only TRUE. Note that it
4722   then remains this way for any subsequent messages on the same SMTP connection.
4723   This is a deliberate choice; even though the load average may fall, it
4724   doesn't seem right to deliver later messages on the same call when not
4725   delivering earlier ones. */
4726
4727   if (!local_queue_only)
4728     {
4729     if (smtp_accept_queue_per_connection > 0 &&
4730         receive_messagecount > smtp_accept_queue_per_connection)
4731       {
4732       local_queue_only = TRUE;
4733       queue_only_reason = 2;
4734       }
4735     else if (queue_only_load >= 0)
4736       {
4737       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4738       if (local_queue_only) queue_only_reason = 3;
4739       }
4740     }
4741
4742   /* If running as an MUA wrapper, all queueing options and freezing options
4743   are ignored. */
4744
4745   if (mua_wrapper)
4746     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4747
4748   /* Log the queueing here, when it will get a message id attached, but
4749   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4750   connections). */
4751
4752   if (local_queue_only) switch(queue_only_reason)
4753     {
4754     case 2:
4755     log_write(L_delay_delivery,
4756               LOG_MAIN, "no immediate delivery: more than %d messages "
4757       "received in one connection", smtp_accept_queue_per_connection);
4758     break;
4759
4760     case 3:
4761     log_write(L_delay_delivery,
4762               LOG_MAIN, "no immediate delivery: load average %.2f",
4763               (double)load_average/1000.0);
4764     break;
4765     }
4766
4767   /* Else do the delivery unless the ACL or local_scan() called for queue only
4768   or froze the message. Always deliver in a separate process. A fork failure is
4769   not a disaster, as the delivery will eventually happen on a subsequent queue
4770   run. The search cache must be tidied before the fork, as the parent will
4771   do it before exiting. The child will trigger a lookup failure and
4772   thereby defer the delivery if it tries to use (for example) a cached ldap
4773   connection that the parent has called unbind on. */
4774
4775   else if (!queue_only_policy && !deliver_freeze)
4776     {
4777     pid_t pid;
4778     search_tidyup();
4779
4780     if ((pid = fork()) == 0)
4781       {
4782       int rc;
4783       close_unwanted();      /* Close unwanted file descriptors and TLS */
4784       exim_nullstd();        /* Ensure std{in,out,err} exist */
4785
4786       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4787       mode, deliver_drop_privilege is forced TRUE). */
4788
4789       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4790         {
4791         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4792           message_id);
4793         /* Control does not return here. */
4794         }
4795
4796       /* No need to re-exec */
4797
4798       rc = deliver_message(message_id, FALSE, FALSE);
4799       search_tidyup();
4800       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4801         EXIT_SUCCESS : EXIT_FAILURE);
4802       }
4803
4804     if (pid < 0)
4805       {
4806       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4807         "process: %s", strerror(errno));
4808       }
4809
4810     /* In the parent, wait if synchronous delivery is required. This will
4811     always be the case in MUA wrapper mode. */
4812
4813     else if (synchronous_delivery)
4814       {
4815       int status;
4816       while (wait(&status) != pid);
4817       if ((status & 0x00ff) != 0)
4818         log_write(0, LOG_MAIN|LOG_PANIC,
4819           "process %d crashed with signal %d while delivering %s",
4820           (int)pid, status & 0x00ff, message_id);
4821       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4822       }
4823     }
4824
4825   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4826   automatically reaps children (see comments above the loop), clear away any
4827   finished subprocesses here, in case there are lots of messages coming in
4828   from the same source. */
4829
4830   #ifndef SIG_IGN_WORKS
4831   while (waitpid(-1, NULL, WNOHANG) > 0);
4832   #endif
4833   }
4834
4835 exim_exit(EXIT_SUCCESS);   /* Never returns */
4836 return 0;                  /* To stop compiler warning */
4837 }
4838
4839 /* End of exim.c */