src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2009 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17
  18
  19 /*************************************************
  20 *      Function interface to store functions     *
  21 *************************************************/
  22
  23 /* We need some real functions to pass to the PCRE regular expression library
  24 for store allocation via Exim's store manager. The normal calls are actually
  25 macros that pass over location information to make tracing easier. These
  26 functions just interface to the standard macro calls. A good compiler will
  27 optimize out the tail recursion and so not make them too expensive. There
  28 are two sets of functions; one for use when we want to retain the compiled
  29 regular expression for a long time; the other for short-term use. */
  30
  31 static void *
  32 function_store_get(size_t size)
  33 {
  34 return store_get((int)size);
  35 }
  36
  37 static void
  38 function_dummy_free(void *block) { block = block; }
  39
  40 static void *
  41 function_store_malloc(size_t size)
  42 {
  43 return store_malloc((int)size);
  44 }
  45
  46 static void
  47 function_store_free(void *block)
  48 {
  49 store_free(block);
  50 }
  51
  52
  53
  54
  55 /*************************************************
  56 *  Compile regular expression and panic on fail  *
  57 *************************************************/
  58
  59 /* This function is called when failure to compile a regular expression leads
  60 to a panic exit. In other cases, pcre_compile() is called directly. In many
  61 cases where this function is used, the results of the compilation are to be
  62 placed in long-lived store, so we temporarily reset the store management
  63 functions that PCRE uses if the use_malloc flag is set.
  64
  65 Argument:
  66   pattern     the pattern to compile
  67   caseless    TRUE if caseless matching is required
  68   use_malloc  TRUE if compile into malloc store
  69
  70 Returns:      pointer to the compiled pattern
  71 */
  72
  73 const pcre *
  74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  75 {
  76 int offset;
  77 int options = PCRE_COPT;
  78 const pcre *yield;
  79 const uschar *error;
  80 if (use_malloc)
  81   {
  82   pcre_malloc = function_store_malloc;
  83   pcre_free = function_store_free;
  84   }
  85 if (caseless) options |= PCRE_CASELESS;
  86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  87 pcre_malloc = function_store_get;
  88 pcre_free = function_dummy_free;
  89 if (yield == NULL)
  90   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  91     "%s at offset %d while compiling %s", error, offset, pattern);
  92 return yield;
  93 }
  94
  95
  96
  97
  98 /*************************************************
  99 *   Execute regular expression and set strings   *
 100 *************************************************/
 101
 102 /* This function runs a regular expression match, and sets up the pointers to
 103 the matched substrings.
 104
 105 Arguments:
 106   re          the compiled expression
 107   subject     the subject string
 108   options     additional PCRE options
 109   setup       if < 0 do full setup
 110               if >= 0 setup from setup+1 onwards,
 111                 excluding the full matched string
 112
 113 Returns:      TRUE or FALSE
 114 */
 115
 116 BOOL
 117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 118 {
 119 int ovector[3*(EXPAND_MAXN+1)];
 120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 121   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 122 BOOL yield = n >= 0;
 123 if (n == 0) n = EXPAND_MAXN + 1;
 124 if (yield)
 125   {
 126   int nn;
 127   expand_nmax = (setup < 0)? 0 : setup + 1;
 128   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 129     {
 130     expand_nstring[expand_nmax] = subject + ovector[nn];
 131     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 132     }
 133   expand_nmax--;
 134   }
 135 return yield;
 136 }
 137
 138
 139
 140
 141 /*************************************************
 142 *             Handler for SIGUSR1                *
 143 *************************************************/
 144
 145 /* SIGUSR1 causes any exim process to write to the process log details of
 146 what it is currently doing. It will only be used if the OS is capable of
 147 setting up a handler that causes automatic restarting of any system call
 148 that is in progress at the time.
 149
 150 Argument: the signal number (SIGUSR1)
 151 Returns:  nothing
 152 */
 153
 154 static void
 155 usr1_handler(int sig)
 156 {
 157 sig = sig;      /* Keep picky compilers happy */
 158 log_write(0, LOG_PROCESS, "%s", process_info);
 159 log_close_all();
 160 os_restarting_signal(SIGUSR1, usr1_handler);
 161 }
 162
 163
 164
 165 /*************************************************
 166 *             Timeout handler                    *
 167 *************************************************/
 168
 169 /* This handler is enabled most of the time that Exim is running. The handler
 170 doesn't actually get used unless alarm() has been called to set a timer, to
 171 place a time limit on a system call of some kind. When the handler is run, it
 172 re-enables itself.
 173
 174 There are some other SIGALRM handlers that are used in special cases when more
 175 than just a flag setting is required; for example, when reading a message's
 176 input. These are normally set up in the code module that uses them, and the
 177 SIGALRM handler is reset to this one afterwards.
 178
 179 Argument: the signal value (SIGALRM)
 180 Returns:  nothing
 181 */
 182
 183 void
 184 sigalrm_handler(int sig)
 185 {
 186 sig = sig;      /* Keep picky compilers happy */
 187 sigalrm_seen = TRUE;
 188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 189 }
 190
 191
 192
 193 /*************************************************
 194 *      Sleep for a fractional time interval      *
 195 *************************************************/
 196
 197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 198 period of time that may include a fraction of a second. The coding is somewhat
 199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 200 will wait for ever, so we panic in this instance. (There was a case of this
 201 when a bug in a function that calls milliwait() caused it to pass invalid data.
 202 That's when I added the check. :-)
 203
 204 Argument:  an itimerval structure containing the interval
 205 Returns:   nothing
 206 */
 207
 208 static void
 209 milliwait(struct itimerval *itval)
 210 {
 211 sigset_t sigmask;
 212 sigset_t old_sigmask;
 213 (void)sigemptyset(&sigmask);                           /* Empty mask */
 214 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 216 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 217   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 218     "setitimer() failed: %s", strerror(errno));
 219 (void)sigfillset(&sigmask);                            /* All signals */
 220 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 221 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 223 }
 224
 225
 226
 227
 228 /*************************************************
 229 *         Millisecond sleep function             *
 230 *************************************************/
 231
 232 /* The basic sleep() function has a granularity of 1 second, which is too rough
 233 in some cases - for example, when using an increasing delay to slow down
 234 spammers.
 235
 236 Argument:    number of millseconds
 237 Returns:     nothing
 238 */
 239
 240 void
 241 millisleep(int msec)
 242 {
 243 struct itimerval itval;
 244 itval.it_interval.tv_sec = 0;
 245 itval.it_interval.tv_usec = 0;
 246 itval.it_value.tv_sec = msec/1000;
 247 itval.it_value.tv_usec = (msec % 1000) * 1000;
 248 milliwait(&itval);
 249 }
 250
 251
 252
 253 /*************************************************
 254 *         Compare microsecond times              *
 255 *************************************************/
 256
 257 /*
 258 Arguments:
 259   tv1         the first time
 260   tv2         the second time
 261
 262 Returns:      -1, 0, or +1
 263 */
 264
 265 int
 266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 267 {
 268 if (t1->tv_sec > t2->tv_sec) return +1;
 269 if (t1->tv_sec < t2->tv_sec) return -1;
 270 if (t1->tv_usec > t2->tv_usec) return +1;
 271 if (t1->tv_usec < t2->tv_usec) return -1;
 272 return 0;
 273 }
 274
 275
 276
 277
 278 /*************************************************
 279 *          Clock tick wait function              *
 280 *************************************************/
 281
 282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 283 message IDs, and in file names for maildir deliveries. Because some OS now
 284 re-use pids within the same second, sub-second times are now being used.
 285 However, for absolute certaintly, we must ensure the clock has ticked before
 286 allowing the relevant process to complete. At the time of implementation of
 287 this code (February 2003), the speed of processors is such that the clock will
 288 invariably have ticked already by the time a process has done its job. This
 289 function prepares for the time when things are faster - and it also copes with
 290 clocks that go backwards.
 291
 292 Arguments:
 293   then_tv      A timeval which was used to create uniqueness; its usec field
 294                  has been rounded down to the value of the resolution.
 295                  We want to be sure the current time is greater than this.
 296   resolution   The resolution that was used to divide the microseconds
 297                  (1 for maildir, larger for message ids)
 298
 299 Returns:       nothing
 300 */
 301
 302 void
 303 exim_wait_tick(struct timeval *then_tv, int resolution)
 304 {
 305 struct timeval now_tv;
 306 long int now_true_usec;
 307
 308 (void)gettimeofday(&now_tv, NULL);
 309 now_true_usec = now_tv.tv_usec;
 310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 311
 312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 313   {
 314   struct itimerval itval;
 315   itval.it_interval.tv_sec = 0;
 316   itval.it_interval.tv_usec = 0;
 317   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 318   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 319
 320   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 321   negative value for the microseconds is possible only in the case when "now"
 322   is more than a second less than "then". That means that itval.it_value.tv_sec
 323   is greater than zero. The following correction is therefore safe. */
 324
 325   if (itval.it_value.tv_usec < 0)
 326     {
 327     itval.it_value.tv_usec += 1000000;
 328     itval.it_value.tv_sec -= 1;
 329     }
 330
 331   DEBUG(D_transport|D_receive)
 332     {
 333     if (!running_in_test_harness)
 334       {
 335       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 336         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 337       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 338         itval.it_value.tv_usec);
 339       }
 340     }
 341
 342   milliwait(&itval);
 343   }
 344 }
 345
 346
 347
 348
 349 /*************************************************
 350 *            Set up processing details           *
 351 *************************************************/
 352
 353 /* Save a text string for dumping when SIGUSR1 is received.
 354 Do checks for overruns.
 355
 356 Arguments: format and arguments, as for printf()
 357 Returns:   nothing
 358 */
 359
 360 void
 361 set_process_info(char *format, ...)
 362 {
 363 int len;
 364 va_list ap;
 365 sprintf(CS process_info, "%5d ", (int)getpid());
 366 len = Ustrlen(process_info);
 367 va_start(ap, format);
 368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 369   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 371 va_end(ap);
 372 }
 373
 374
 375
 376
 377
 378 /*************************************************
 379 *   Call fopen() with umask 777 and adjust mode  *
 380 *************************************************/
 381
 382 /* Exim runs with umask(0) so that files created with open() have the mode that
 383 is specified in the open() call. However, there are some files, typically in
 384 the spool directory, that are created with fopen(). They end up world-writeable
 385 if no precautions are taken. Although the spool directory is not accessible to
 386 the world, this is an untidiness. So this is a wrapper function for fopen()
 387 that sorts out the mode of the created file.
 388
 389 Arguments:
 390    filename       the file name
 391    options        the fopen() options
 392    mode           the required mode
 393
 394 Returns:          the fopened FILE or NULL
 395 */
 396
 397 FILE *
 398 modefopen(uschar *filename, char *options, mode_t mode)
 399 {
 400 mode_t saved_umask = umask(0777);
 401 FILE *f = Ufopen(filename, options);
 402 (void)umask(saved_umask);
 403 if (f != NULL) (void)fchmod(fileno(f), mode);
 404 return f;
 405 }
 406
 407
 408
 409
 410 /*************************************************
 411 *   Ensure stdin, stdout, and stderr exist       *
 412 *************************************************/
 413
 414 /* Some operating systems grumble if an exec() happens without a standard
 415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 416 file will be opened and will use these fd values, and then some other bit of
 417 code will assume, for example, that it can write error messages to stderr.
 418 This function ensures that fds 0, 1, and 2 are open if they do not already
 419 exist, by connecting them to /dev/null.
 420
 421 This function is also used to ensure that std{in,out,err} exist at all times,
 422 so that if any library that Exim calls tries to use them, it doesn't crash.
 423
 424 Arguments:  None
 425 Returns:    Nothing
 426 */
 427
 428 void
 429 exim_nullstd(void)
 430 {
 431 int i;
 432 int devnull = -1;
 433 struct stat statbuf;
 434 for (i = 0; i <= 2; i++)
 435   {
 436   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 437     {
 438     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 439     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 440       string_open_failed(errno, "/dev/null"));
 441     if (devnull != i) (void)dup2(devnull, i);
 442     }
 443   }
 444 if (devnull > 2) (void)close(devnull);
 445 }
 446
 447
 448
 449
 450 /*************************************************
 451 *   Close unwanted file descriptors for delivery *
 452 *************************************************/
 453
 454 /* This function is called from a new process that has been forked to deliver
 455 an incoming message, either directly, or using exec.
 456
 457 We want any smtp input streams to be closed in this new process. However, it
 458 has been observed that using fclose() here causes trouble. When reading in -bS
 459 input, duplicate copies of messages have been seen. The files will be sharing a
 460 file pointer with the parent process, and it seems that fclose() (at least on
 461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 462 least sometimes. Hence we go for closing the underlying file descriptors.
 463
 464 If TLS is active, we want to shut down the TLS library, but without molesting
 465 the parent's SSL connection.
 466
 467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 468 stderr unless debugging) because the calling process might have set them up as
 469 pipes and be waiting for them to close before it waits for the submission
 470 process to terminate. If they aren't closed, they hold up the calling process
 471 until the initial delivery process finishes, which is not what we want.
 472
 473 Exception: We do want it for synchronous delivery!
 474
 475 And notwithstanding all the above, if D_resolver is set, implying resolver
 476 debugging, leave stdout open, because that's where the resolver writes its
 477 debugging output.
 478
 479 When we close stderr (which implies we've also closed stdout), we also get rid
 480 of any controlling terminal.
 481
 482 Arguments:   None
 483 Returns:     Nothing
 484 */
 485
 486 static void
 487 close_unwanted(void)
 488 {
 489 if (smtp_input)
 490   {
 491   #ifdef SUPPORT_TLS
 492   tls_close(FALSE);      /* Shut down the TLS library */
 493   #endif
 494   (void)close(fileno(smtp_in));
 495   (void)close(fileno(smtp_out));
 496   smtp_in = NULL;
 497   }
 498 else
 499   {
 500   (void)close(0);                                          /* stdin */
 501   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 502   if (debug_selector == 0)                                 /* stderr */
 503     {
 504     if (!synchronous_delivery)
 505       {
 506       (void)close(2);
 507       log_stderr = NULL;
 508       }
 509     (void)setsid();
 510     }
 511   }
 512 }
 513
 514
 515
 516
 517 /*************************************************
 518 *          Set uid and gid                       *
 519 *************************************************/
 520
 521 /* This function sets a new uid and gid permanently, optionally calling
 522 initgroups() to set auxiliary groups. There are some special cases when running
 523 Exim in unprivileged modes. In these situations the effective uid will not be
 524 root; if we already have the right effective uid/gid, and don't need to
 525 initialize any groups, leave things as they are.
 526
 527 Arguments:
 528   uid        the uid
 529   gid        the gid
 530   igflag     TRUE if initgroups() wanted
 531   msg        text to use in debugging output and failure log
 532
 533 Returns:     nothing; bombs out on failure
 534 */
 535
 536 void
 537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 538 {
 539 uid_t euid = geteuid();
 540 gid_t egid = getegid();
 541
 542 if (euid == root_uid || euid != uid || egid != gid || igflag)
 543   {
 544   /* At least one OS returns +1 for initgroups failure, so just check for
 545   non-zero. */
 546
 547   if (igflag)
 548     {
 549     struct passwd *pw = getpwuid(uid);
 550     if (pw != NULL)
 551       {
 552       if (initgroups(pw->pw_name, gid) != 0)
 553         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 554           (long int)uid, strerror(errno));
 555       }
 556     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 557       "no passwd entry for uid=%ld", (long int)uid);
 558     }
 559
 560   if (setgid(gid) < 0 || setuid(uid) < 0)
 561     {
 562     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 563       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 564     }
 565   }
 566
 567 /* Debugging output included uid/gid and all groups */
 568
 569 DEBUG(D_uid)
 570   {
 571   int group_count;
 572   gid_t group_list[NGROUPS_MAX];
 573   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 574     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 575   group_count = getgroups(NGROUPS_MAX, group_list);
 576   debug_printf("  auxiliary group list:");
 577   if (group_count > 0)
 578     {
 579     int i;
 580     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 581     }
 582   else debug_printf(" <none>");
 583   debug_printf("\n");
 584   }
 585 }
 586
 587
 588
 589
 590 /*************************************************
 591 *               Exit point                       *
 592 *************************************************/
 593
 594 /* Exim exits via this function so that it always clears up any open
 595 databases.
 596
 597 Arguments:
 598   rc         return code
 599
 600 Returns:     does not return
 601 */
 602
 603 void
 604 exim_exit(int rc)
 605 {
 606 search_tidyup();
 607 DEBUG(D_any)
 608   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 609     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 610 exit(rc);
 611 }
 612
 613
 614
 615
 616 /*************************************************
 617 *         Extract port from host address         *
 618 *************************************************/
 619
 620 /* Called to extract the port from the values given to -oMa and -oMi.
 621 It also checks the syntax of the address, and terminates it before the
 622 port data when a port is extracted.
 623
 624 Argument:
 625   address   the address, with possible port on the end
 626
 627 Returns:    the port, or zero if there isn't one
 628             bombs out on a syntax error
 629 */
 630
 631 static int
 632 check_port(uschar *address)
 633 {
 634 int port = host_address_extract_port(address);
 635 if (string_is_ip_address(address, NULL) == 0)
 636   {
 637   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 638   exit(EXIT_FAILURE);
 639   }
 640 return port;
 641 }
 642
 643
 644
 645 /*************************************************
 646 *              Test/verify an address            *
 647 *************************************************/
 648
 649 /* This function is called by the -bv and -bt code. It extracts a working
 650 address from a full RFC 822 address. This isn't really necessary per se, but it
 651 has the effect of collapsing source routes.
 652
 653 Arguments:
 654   s            the address string
 655   flags        flag bits for verify_address()
 656   exit_value   to be set for failures
 657
 658 Returns:       nothing
 659 */
 660
 661 static void
 662 test_address(uschar *s, int flags, int *exit_value)
 663 {
 664 int start, end, domain;
 665 uschar *parse_error = NULL;
 666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 667   FALSE);
 668 if (address == NULL)
 669   {
 670   fprintf(stdout, "syntax error: %s\n", parse_error);
 671   *exit_value = 2;
 672   }
 673 else
 674   {
 675   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 676     -1, -1, NULL, NULL, NULL);
 677   if (rc == FAIL) *exit_value = 2;
 678     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 679   }
 680 }
 681
 682
 683
 684 /*************************************************
 685 *          Show supported features               *
 686 *************************************************/
 687
 688 /* This function is called for -bV/--version and for -d to output the optional
 689 features of the current Exim binary.
 690
 691 Arguments:  a FILE for printing
 692 Returns:    nothing
 693 */
 694
 695 static void
 696 show_whats_supported(FILE *f)
 697 {
 698 #ifdef DB_VERSION_STRING
 699 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 700 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 701   #ifdef USE_DB
 702   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 703   #else
 704   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 705   #endif
 706 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 707 fprintf(f, "Probably ndbm\n");
 708 #elif defined(USE_TDB)
 709 fprintf(f, "Using tdb\n");
 710 #else
 711   #ifdef USE_GDBM
 712   fprintf(f, "Probably GDBM (native mode)\n");
 713   #else
 714   fprintf(f, "Probably GDBM (compatibility mode)\n");
 715   #endif
 716 #endif
 717
 718 fprintf(f, "Support for:");
 719 #ifdef SUPPORT_CRYPTEQ
 720   fprintf(f, " crypteq");
 721 #endif
 722 #if HAVE_ICONV
 723   fprintf(f, " iconv()");
 724 #endif
 725 #if HAVE_IPV6
 726   fprintf(f, " IPv6");
 727 #endif
 728 #ifdef HAVE_SETCLASSRESOURCES
 729   fprintf(f, " use_setclassresources");
 730 #endif
 731 #ifdef SUPPORT_PAM
 732   fprintf(f, " PAM");
 733 #endif
 734 #ifdef EXIM_PERL
 735   fprintf(f, " Perl");
 736 #endif
 737 #ifdef EXPAND_DLFUNC
 738   fprintf(f, " Expand_dlfunc");
 739 #endif
 740 #ifdef USE_TCP_WRAPPERS
 741   fprintf(f, " TCPwrappers");
 742 #endif
 743 #ifdef SUPPORT_TLS
 744   #ifdef USE_GNUTLS
 745   fprintf(f, " GnuTLS");
 746   #else
 747   fprintf(f, " OpenSSL");
 748   #endif
 749 #endif
 750 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 751   fprintf(f, " translate_ip_address");
 752 #endif
 753 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 754   fprintf(f, " move_frozen_messages");
 755 #endif
 756 #ifdef WITH_CONTENT_SCAN
 757   fprintf(f, " Content_Scanning");
 758 #endif
 759 #ifndef DISABLE_DKIM
 760   fprintf(f, " DKIM");
 761 #endif
 762 #ifdef WITH_OLD_DEMIME
 763   fprintf(f, " Old_Demime");
 764 #endif
 765 #ifdef EXPERIMENTAL_SPF
 766   fprintf(f, " Experimental_SPF");
 767 #endif
 768 #ifdef EXPERIMENTAL_SRS
 769   fprintf(f, " Experimental_SRS");
 770 #endif
 771 #ifdef EXPERIMENTAL_BRIGHTMAIL
 772   fprintf(f, " Experimental_Brightmail");
 773 #endif
 774 #ifdef EXPERIMENTAL_DCC
 775   fprintf(f, " Experimental_DCC");
 776 #endif
 777 fprintf(f, "\n");
 778
 779 fprintf(f, "Lookups:");
 780 #ifdef LOOKUP_LSEARCH
 781   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 782 #endif
 783 #ifdef LOOKUP_CDB
 784   fprintf(f, " cdb");
 785 #endif
 786 #ifdef LOOKUP_DBM
 787   fprintf(f, " dbm dbmnz");
 788 #endif
 789 #ifdef LOOKUP_DNSDB
 790   fprintf(f, " dnsdb");
 791 #endif
 792 #ifdef LOOKUP_DSEARCH
 793   fprintf(f, " dsearch");
 794 #endif
 795 #ifdef LOOKUP_IBASE
 796   fprintf(f, " ibase");
 797 #endif
 798 #ifdef LOOKUP_LDAP
 799   fprintf(f, " ldap ldapdn ldapm");
 800 #endif
 801 #ifdef LOOKUP_MYSQL
 802   fprintf(f, " mysql");
 803 #endif
 804 #ifdef LOOKUP_NIS
 805   fprintf(f, " nis nis0");
 806 #endif
 807 #ifdef LOOKUP_NISPLUS
 808   fprintf(f, " nisplus");
 809 #endif
 810 #ifdef LOOKUP_ORACLE
 811   fprintf(f, " oracle");
 812 #endif
 813 #ifdef LOOKUP_PASSWD
 814   fprintf(f, " passwd");
 815 #endif
 816 #ifdef LOOKUP_PGSQL
 817   fprintf(f, " pgsql");
 818 #endif
 819 #ifdef LOOKUP_SQLITE
 820   fprintf(f, " sqlite");
 821 #endif
 822 #ifdef LOOKUP_TESTDB
 823   fprintf(f, " testdb");
 824 #endif
 825 #ifdef LOOKUP_WHOSON
 826   fprintf(f, " whoson");
 827 #endif
 828 fprintf(f, "\n");
 829
 830 fprintf(f, "Authenticators:");
 831 #ifdef AUTH_CRAM_MD5
 832   fprintf(f, " cram_md5");
 833 #endif
 834 #ifdef AUTH_CYRUS_SASL
 835   fprintf(f, " cyrus_sasl");
 836 #endif
 837 #ifdef AUTH_DOVECOT
 838   fprintf(f, " dovecot");
 839 #endif
 840 #ifdef AUTH_PLAINTEXT
 841   fprintf(f, " plaintext");
 842 #endif
 843 #ifdef AUTH_SPA
 844   fprintf(f, " spa");
 845 #endif
 846 fprintf(f, "\n");
 847
 848 fprintf(f, "Routers:");
 849 #ifdef ROUTER_ACCEPT
 850   fprintf(f, " accept");
 851 #endif
 852 #ifdef ROUTER_DNSLOOKUP
 853   fprintf(f, " dnslookup");
 854 #endif
 855 #ifdef ROUTER_IPLITERAL
 856   fprintf(f, " ipliteral");
 857 #endif
 858 #ifdef ROUTER_IPLOOKUP
 859   fprintf(f, " iplookup");
 860 #endif
 861 #ifdef ROUTER_MANUALROUTE
 862   fprintf(f, " manualroute");
 863 #endif
 864 #ifdef ROUTER_QUERYPROGRAM
 865   fprintf(f, " queryprogram");
 866 #endif
 867 #ifdef ROUTER_REDIRECT
 868   fprintf(f, " redirect");
 869 #endif
 870 fprintf(f, "\n");
 871
 872 fprintf(f, "Transports:");
 873 #ifdef TRANSPORT_APPENDFILE
 874   fprintf(f, " appendfile");
 875   #ifdef SUPPORT_MAILDIR
 876     fprintf(f, "/maildir");
 877   #endif
 878   #ifdef SUPPORT_MAILSTORE
 879     fprintf(f, "/mailstore");
 880   #endif
 881   #ifdef SUPPORT_MBX
 882     fprintf(f, "/mbx");
 883   #endif
 884 #endif
 885 #ifdef TRANSPORT_AUTOREPLY
 886   fprintf(f, " autoreply");
 887 #endif
 888 #ifdef TRANSPORT_LMTP
 889   fprintf(f, " lmtp");
 890 #endif
 891 #ifdef TRANSPORT_PIPE
 892   fprintf(f, " pipe");
 893 #endif
 894 #ifdef TRANSPORT_SMTP
 895   fprintf(f, " smtp");
 896 #endif
 897 fprintf(f, "\n");
 898
 899 if (fixed_never_users[0] > 0)
 900   {
 901   int i;
 902   fprintf(f, "Fixed never_users: ");
 903   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
 904     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
 905   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
 906   }
 907
 908 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
 909
 910 /* This runtime check is to help diagnose library linkage mismatches which
 911 result in segfaults and the like; as such, it's left until the end,
 912 just in case.  There will still be a "Configuration file is" line still to
 913 come. */
 914 #ifdef SUPPORT_TLS
 915 tls_version_report(f);
 916 #endif
 917 }
 918
 919
 920
 921
 922 /*************************************************
 923 *               Quote a local part               *
 924 *************************************************/
 925
 926 /* This function is used when a sender address or a From: or Sender: header
 927 line is being created from the caller's login, or from an authenticated_id. It
 928 applies appropriate quoting rules for a local part.
 929
 930 Argument:    the local part
 931 Returns:     the local part, quoted if necessary
 932 */
 933
 934 uschar *
 935 local_part_quote(uschar *lpart)
 936 {
 937 BOOL needs_quote = FALSE;
 938 int size, ptr;
 939 uschar *yield;
 940 uschar *t;
 941
 942 for (t = lpart; !needs_quote && *t != 0; t++)
 943   {
 944   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
 945     (*t != '.' || t == lpart || t[1] == 0);
 946   }
 947
 948 if (!needs_quote) return lpart;
 949
 950 size = ptr = 0;
 951 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
 952
 953 for (;;)
 954   {
 955   uschar *nq = US Ustrpbrk(lpart, "\\\"");
 956   if (nq == NULL)
 957     {
 958     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
 959     break;
 960     }
 961   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
 962   yield = string_cat(yield, &size, &ptr, US"\\", 1);
 963   yield = string_cat(yield, &size, &ptr, nq, 1);
 964   lpart = nq + 1;
 965   }
 966
 967 yield = string_cat(yield, &size, &ptr, US"\"", 1);
 968 yield[ptr] = 0;
 969 return yield;
 970 }
 971
 972
 973
 974 #ifdef USE_READLINE
 975 /*************************************************
 976 *         Load readline() functions              *
 977 *************************************************/
 978
 979 /* This function is called from testing executions that read data from stdin,
 980 but only when running as the calling user. Currently, only -be does this. The
 981 function loads the readline() function library and passes back the functions.
 982 On some systems, it needs the curses library, so load that too, but try without
 983 it if loading fails. All this functionality has to be requested at build time.
 984
 985 Arguments:
 986   fn_readline_ptr   pointer to where to put the readline pointer
 987   fn_addhist_ptr    pointer to where to put the addhistory function
 988
 989 Returns:            the dlopen handle or NULL on failure
 990 */
 991
 992 static void *
 993 set_readline(char * (**fn_readline_ptr)(char *),
 994              char * (**fn_addhist_ptr)(char *))
 995 {
 996 void *dlhandle;
 997 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
 998
 999 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1000 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1001
1002 if (dlhandle != NULL)
1003   {
1004   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1005   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1006   }
1007 else
1008   {
1009   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1010   }
1011
1012 return dlhandle;
1013 }
1014 #endif
1015
1016
1017
1018 /*************************************************
1019 *    Get a line from stdin for testing things    *
1020 *************************************************/
1021
1022 /* This function is called when running tests that can take a number of lines
1023 of input (for example, -be and -bt). It handles continuations and trailing
1024 spaces. And prompting and a blank line output on eof. If readline() is in use,
1025 the arguments are non-NULL and provide the relevant functions.
1026
1027 Arguments:
1028   fn_readline   readline function or NULL
1029   fn_addhist    addhist function or NULL
1030
1031 Returns:        pointer to dynamic memory, or NULL at end of file
1032 */
1033
1034 static uschar *
1035 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1036 {
1037 int i;
1038 int size = 0;
1039 int ptr = 0;
1040 uschar *yield = NULL;
1041
1042 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1043
1044 for (i = 0;; i++)
1045   {
1046   uschar buffer[1024];
1047   uschar *p, *ss;
1048
1049   #ifdef USE_READLINE
1050   char *readline_line = NULL;
1051   if (fn_readline != NULL)
1052     {
1053     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1054     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1055     p = US readline_line;
1056     }
1057   else
1058   #endif
1059
1060   /* readline() not in use */
1061
1062     {
1063     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1064     p = buffer;
1065     }
1066
1067   /* Handle the line */
1068
1069   ss = p + (int)Ustrlen(p);
1070   while (ss > p && isspace(ss[-1])) ss--;
1071
1072   if (i > 0)
1073     {
1074     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1075     }
1076
1077   yield = string_cat(yield, &size, &ptr, p, ss - p);
1078
1079   #ifdef USE_READLINE
1080   if (fn_readline != NULL) free(readline_line);
1081   #endif
1082
1083   if (ss == p || yield[ptr-1] != '\\')
1084     {
1085     yield[ptr] = 0;
1086     break;
1087     }
1088   yield[--ptr] = 0;
1089   }
1090
1091 if (yield == NULL) printf("\n");
1092 return yield;
1093 }
1094
1095
1096
1097 /*************************************************
1098 *    Output usage information for the program    *
1099 *************************************************/
1100
1101 /* This function is called when there are no recipients
1102    or a specific --help argument was added.
1103
1104 Arguments:
1105   progname      information on what name we were called by
1106
1107 Returns:        DOES NOT RETURN
1108 */
1109
1110 static void
1111 exim_usage(uschar *progname)
1112 {
1113
1114 /* Handle specific program invocation varients */
1115 if (Ustrcmp(progname, US"-mailq") == 0)
1116   {
1117   fprintf(stderr,
1118     "mailq - list the contents of the mail queue\n\n"
1119     "For a list of options, see the Exim documentation.\n");
1120   exit(EXIT_FAILURE);
1121   }
1122
1123 /* Generic usage - we output this whatever happens */
1124 fprintf(stderr,
1125   "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1126   "not directly from a shell command line. Options and/or arguments control\n"
1127   "what it does when called. For a list of options, see the Exim documentation.\n");
1128
1129 exit(EXIT_FAILURE);
1130 }
1131
1132
1133
1134 /*************************************************
1135 *          Entry point and high-level code       *
1136 *************************************************/
1137
1138 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1139 the appropriate action. All the necessary functions are present in the one
1140 binary. I originally thought one should split it up, but it turns out that so
1141 much of the apparatus is needed in each chunk that one might as well just have
1142 it all available all the time, which then makes the coding easier as well.
1143
1144 Arguments:
1145   argc      count of entries in argv
1146   argv      argument strings, with argv[0] being the program name
1147
1148 Returns:    EXIT_SUCCESS if terminated successfully
1149             EXIT_FAILURE otherwise, except when a message has been sent
1150               to the sender, and -oee was given
1151 */
1152
1153 int
1154 main(int argc, char **cargv)
1155 {
1156 uschar **argv = USS cargv;
1157 int  arg_receive_timeout = -1;
1158 int  arg_smtp_receive_timeout = -1;
1159 int  arg_error_handling = error_handling;
1160 int  filter_sfd = -1;
1161 int  filter_ufd = -1;
1162 int  group_count;
1163 int  i;
1164 int  list_queue_option = 0;
1165 int  msg_action = 0;
1166 int  msg_action_arg = -1;
1167 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1168 int  queue_only_reason = 0;
1169 #ifdef EXIM_PERL
1170 int  perl_start_option = 0;
1171 #endif
1172 int  recipients_arg = argc;
1173 int  sender_address_domain = 0;
1174 int  test_retry_arg = -1;
1175 int  test_rewrite_arg = -1;
1176 BOOL arg_queue_only = FALSE;
1177 BOOL bi_option = FALSE;
1178 BOOL checking = FALSE;
1179 BOOL count_queue = FALSE;
1180 BOOL expansion_test = FALSE;
1181 BOOL extract_recipients = FALSE;
1182 BOOL forced_delivery = FALSE;
1183 BOOL f_end_dot = FALSE;
1184 BOOL deliver_give_up = FALSE;
1185 BOOL list_queue = FALSE;
1186 BOOL list_options = FALSE;
1187 BOOL local_queue_only;
1188 BOOL more = TRUE;
1189 BOOL one_msg_action = FALSE;
1190 BOOL queue_only_set = FALSE;
1191 BOOL receiving_message = TRUE;
1192 BOOL sender_ident_set = FALSE;
1193 BOOL session_local_queue_only;
1194 BOOL unprivileged;
1195 BOOL removed_privilege = FALSE;
1196 BOOL usage_wanted = FALSE;
1197 BOOL verify_address_mode = FALSE;
1198 BOOL verify_as_sender = FALSE;
1199 BOOL version_printed = FALSE;
1200 uschar *alias_arg = NULL;
1201 uschar *called_as = US"";
1202 uschar *start_queue_run_id = NULL;
1203 uschar *stop_queue_run_id = NULL;
1204 uschar *expansion_test_message = NULL;
1205 uschar *ftest_domain = NULL;
1206 uschar *ftest_localpart = NULL;
1207 uschar *ftest_prefix = NULL;
1208 uschar *ftest_suffix = NULL;
1209 uschar *malware_test_file = NULL;
1210 uschar *real_sender_address;
1211 uschar *originator_home = US"/";
1212 void *reset_point;
1213
1214 struct passwd *pw;
1215 struct stat statbuf;
1216 pid_t passed_qr_pid = (pid_t)0;
1217 int passed_qr_pipe = -1;
1218 gid_t group_list[NGROUPS_MAX];
1219
1220 /* Possible options for -R and -S */
1221
1222 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1223
1224 /* Need to define this in case we need to change the environment in order
1225 to get rid of a bogus time zone. We have to make it char rather than uschar
1226 because some OS define it in /usr/include/unistd.h. */
1227
1228 extern char **environ;
1229
1230 /* If the Exim user and/or group and/or the configuration file owner/group were
1231 defined by ref:name at build time, we must now find the actual uid/gid values.
1232 This is a feature to make the lives of binary distributors easier. */
1233
1234 #ifdef EXIM_USERNAME
1235 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1236   {
1237   if (exim_uid == 0)
1238     {
1239     fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1240       EXIM_USERNAME);
1241     exit(EXIT_FAILURE);
1242     }
1243   exim_gid = pw->pw_gid;
1244   }
1245 else
1246   {
1247   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1248     EXIM_USERNAME);
1249   exit(EXIT_FAILURE);
1250   }
1251 #endif
1252
1253 #ifdef EXIM_GROUPNAME
1254 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1255   {
1256   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1257     EXIM_GROUPNAME);
1258   exit(EXIT_FAILURE);
1259   }
1260 #endif
1261
1262 #ifdef CONFIGURE_OWNERNAME
1263 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1264   {
1265   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1266     CONFIGURE_OWNERNAME);
1267   exit(EXIT_FAILURE);
1268   }
1269 #endif
1270
1271 #ifdef CONFIGURE_GROUPNAME
1272 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1273   {
1274   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1275     CONFIGURE_GROUPNAME);
1276   exit(EXIT_FAILURE);
1277   }
1278 #endif
1279
1280 /* In the Cygwin environment, some initialization needs doing. It is fudged
1281 in by means of this macro. */
1282
1283 #ifdef OS_INIT
1284 OS_INIT
1285 #endif
1286
1287 /* Check a field which is patched when we are running Exim within its
1288 testing harness; do a fast initial check, and then the whole thing. */
1289
1290 running_in_test_harness =
1291   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1292
1293 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1294 at the start of a program; however, it seems that some environments do not
1295 follow this. A "strange" locale can affect the formatting of timestamps, so we
1296 make quite sure. */
1297
1298 setlocale(LC_ALL, "C");
1299
1300 /* Set up the default handler for timing using alarm(). */
1301
1302 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1303
1304 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1305 because store_malloc writes a log entry on failure. */
1306
1307 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1308 if (log_buffer == NULL)
1309   {
1310   fprintf(stderr, "exim: failed to get store for log buffer\n");
1311   exit(EXIT_FAILURE);
1312   }
1313
1314 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1315 NULL when the daemon is run and the file is closed. We have to use this
1316 indirection, because some systems don't allow writing to the variable "stderr".
1317 */
1318
1319 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1320
1321 /* Arrange for the PCRE regex library to use our store functions. Note that
1322 the normal calls are actually macros that add additional arguments for
1323 debugging purposes so we have to assign specially constructed functions here.
1324 The default is to use store in the stacking pool, but this is overridden in the
1325 regex_must_compile() function. */
1326
1327 pcre_malloc = function_store_get;
1328 pcre_free = function_dummy_free;
1329
1330 /* Ensure there is a big buffer for temporary use in several places. It is put
1331 in malloc store so that it can be freed for enlargement if necessary. */
1332
1333 big_buffer = store_malloc(big_buffer_size);
1334
1335 /* Set up the handler for the data request signal, and set the initial
1336 descriptive text. */
1337
1338 set_process_info("initializing");
1339 os_restarting_signal(SIGUSR1, usr1_handler);
1340
1341 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1342 in the daemon code. For the rest of Exim's uses, we ignore it. */
1343
1344 signal(SIGHUP, SIG_IGN);
1345
1346 /* We don't want to die on pipe errors as the code is written to handle
1347 the write error instead. */
1348
1349 signal(SIGPIPE, SIG_IGN);
1350
1351 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1352 set to SIG_IGN. This causes subprocesses that complete before the parent
1353 process waits for them not to hang around, so when Exim calls wait(), nothing
1354 is there. The wait() code has been made robust against this, but let's ensure
1355 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1356 ending status. We use sigaction rather than plain signal() on those OS where
1357 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1358 problem on AIX with this.) */
1359
1360 #ifdef SA_NOCLDWAIT
1361   {
1362   struct sigaction act;
1363   act.sa_handler = SIG_DFL;
1364   sigemptyset(&(act.sa_mask));
1365   act.sa_flags = 0;
1366   sigaction(SIGCHLD, &act, NULL);
1367   }
1368 #else
1369 signal(SIGCHLD, SIG_DFL);
1370 #endif
1371
1372 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1373 SIGHUP. */
1374
1375 sighup_argv = argv;
1376
1377 /* Set up the version number. Set up the leading 'E' for the external form of
1378 message ids, set the pointer to the internal form, and initialize it to
1379 indicate no message being processed. */
1380
1381 version_init();
1382 message_id_option[0] = '-';
1383 message_id_external = message_id_option + 1;
1384 message_id_external[0] = 'E';
1385 message_id = message_id_external + 1;
1386 message_id[0] = 0;
1387
1388 /* Set the umask to zero so that any files Exim creates using open() are
1389 created with the modes that it specifies. NOTE: Files created with fopen() have
1390 a problem, which was not recognized till rather late (February 2006). With this
1391 umask, such files will be world writeable. (They are all content scanning files
1392 in the spool directory, which isn't world-accessible, so this is not a
1393 disaster, but it's untidy.) I don't want to change this overall setting,
1394 however, because it will interact badly with the open() calls. Instead, there's
1395 now a function called modefopen() that fiddles with the umask while calling
1396 fopen(). */
1397
1398 (void)umask(0);
1399
1400 /* Precompile the regular expression for matching a message id. Keep this in
1401 step with the code that generates ids in the accept.c module. We need to do
1402 this here, because the -M options check their arguments for syntactic validity
1403 using mac_ismsgid, which uses this. */
1404
1405 regex_ismsgid =
1406   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1407
1408 /* Precompile the regular expression that is used for matching an SMTP error
1409 code, possibly extended, at the start of an error message. Note that the
1410 terminating whitespace character is included. */
1411
1412 regex_smtp_code =
1413   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1414     FALSE, TRUE);
1415
1416 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1417 this seems to be a generally accepted convention, since one finds symbolic
1418 links called "mailq" in standard OS configurations. */
1419
1420 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1421     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1422   {
1423   list_queue = TRUE;
1424   receiving_message = FALSE;
1425   called_as = US"-mailq";
1426   }
1427
1428 /* If the program is called as "rmail" treat it as equivalent to
1429 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1430 i.e. preventing a single dot on a line from terminating the message, and
1431 returning with zero return code, even in cases of error (provided an error
1432 message has been sent). */
1433
1434 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1435     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1436   {
1437   dot_ends = FALSE;
1438   called_as = US"-rmail";
1439   errors_sender_rc = EXIT_SUCCESS;
1440   }
1441
1442 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1443 this is a smail convention. */
1444
1445 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1446     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1447   {
1448   smtp_input = smtp_batched_input = TRUE;
1449   called_as = US"-rsmtp";
1450   }
1451
1452 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1453 this is a smail convention. */
1454
1455 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1456     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1457   {
1458   queue_interval = 0;
1459   receiving_message = FALSE;
1460   called_as = US"-runq";
1461   }
1462
1463 /* If the program is called as "newaliases" treat it as equivalent to
1464 "exim -bi"; this is a sendmail convention. */
1465
1466 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1467     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1468   {
1469   bi_option = TRUE;
1470   receiving_message = FALSE;
1471   called_as = US"-newaliases";
1472   }
1473
1474 /* Save the original effective uid for a couple of uses later. It should
1475 normally be root, but in some esoteric environments it may not be. */
1476
1477 original_euid = geteuid();
1478
1479 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1480 to be the same as the real ones. This makes a difference only if Exim is setuid
1481 (or setgid) to something other than root, which could be the case in some
1482 special configurations. */
1483
1484 real_uid = getuid();
1485 real_gid = getgid();
1486
1487 if (real_uid == root_uid)
1488   {
1489   setgid(real_gid);
1490   setuid(real_uid);
1491   }
1492
1493 /* If neither the original real uid nor the original euid was root, Exim is
1494 running in an unprivileged state. */
1495
1496 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1497
1498 /* Scan the program's arguments. Some can be dealt with right away; others are
1499 simply recorded for checking and handling afterwards. Do a high-level switch
1500 on the second character (the one after '-'), to save some effort. */
1501
1502 for (i = 1; i < argc; i++)
1503   {
1504   BOOL badarg = FALSE;
1505   uschar *arg = argv[i];
1506   uschar *argrest;
1507   int switchchar;
1508
1509   /* An argument not starting with '-' is the start of a recipients list;
1510   break out of the options-scanning loop. */
1511
1512   if (arg[0] != '-')
1513     {
1514     recipients_arg = i;
1515     break;
1516     }
1517
1518   /* An option consistion of -- terminates the options */
1519
1520   if (Ustrcmp(arg, "--") == 0)
1521     {
1522     recipients_arg = i + 1;
1523     break;
1524     }
1525
1526   /* Handle flagged options */
1527
1528   switchchar = arg[1];
1529   argrest = arg+2;
1530
1531   /* Make all -ex options synonymous with -oex arguments, since that
1532   is assumed by various callers. Also make -qR options synonymous with -R
1533   options, as that seems to be required as well. Allow for -qqR too, and
1534   the same for -S options. */
1535
1536   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1537       Ustrncmp(arg+1, "qR", 2) == 0 ||
1538       Ustrncmp(arg+1, "qS", 2) == 0)
1539     {
1540     switchchar = arg[2];
1541     argrest++;
1542     }
1543   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1544     {
1545     switchchar = arg[3];
1546     argrest += 2;
1547     queue_2stage = TRUE;
1548     }
1549
1550   /* Make -r synonymous with -f, since it is a documented alias */
1551
1552   else if (arg[1] == 'r') switchchar = 'f';
1553
1554   /* Make -ov synonymous with -v */
1555
1556   else if (Ustrcmp(arg, "-ov") == 0)
1557     {
1558     switchchar = 'v';
1559     argrest++;
1560     }
1561
1562   /* deal with --option_aliases */
1563   else if (switchchar == '-')
1564     {
1565     if (Ustrcmp(argrest, "help") == 0)
1566       {
1567       usage_wanted = TRUE;
1568       break;
1569       }
1570     else if (Ustrcmp(argrest, "version") == 0)
1571       {
1572       switchchar = 'b';
1573       argrest = US"V";
1574       }
1575     }
1576
1577   /* High-level switch on active initial letter */
1578
1579   switch(switchchar)
1580     {
1581     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1582     so has no need of it. */
1583
1584     case 'B':
1585     if (*argrest == 0) i++;       /* Skip over the type */
1586     break;
1587
1588
1589     case 'b':
1590     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1591
1592     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1593        -bdf: Ditto, but in the foreground.
1594     */
1595
1596     if (*argrest == 'd')
1597       {
1598       daemon_listen = TRUE;
1599       if (*(++argrest) == 'f') background_daemon = FALSE;
1600         else if (*argrest != 0) { badarg = TRUE; break; }
1601       }
1602
1603     /* -be:  Run in expansion test mode
1604        -bem: Ditto, but read a message from a file first
1605     */
1606
1607     else if (*argrest == 'e')
1608       {
1609       expansion_test = checking = TRUE;
1610       if (argrest[1] == 'm')
1611         {
1612         if (++i >= argc) { badarg = TRUE; break; }
1613         expansion_test_message = argv[i];
1614         argrest++;
1615         }
1616       if (argrest[1] != 0) { badarg = TRUE; break; }
1617       }
1618
1619     /* -bF:  Run system filter test */
1620
1621     else if (*argrest == 'F')
1622       {
1623       filter_test |= FTEST_SYSTEM;
1624       if (*(++argrest) != 0) { badarg = TRUE; break; }
1625       if (++i < argc) filter_test_sfile = argv[i]; else
1626         {
1627         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1628         exit(EXIT_FAILURE);
1629         }
1630       }
1631
1632     /* -bf:  Run user filter test
1633        -bfd: Set domain for filter testing
1634        -bfl: Set local part for filter testing
1635        -bfp: Set prefix for filter testing
1636        -bfs: Set suffix for filter testing
1637     */
1638
1639     else if (*argrest == 'f')
1640       {
1641       if (*(++argrest) == 0)
1642         {
1643         filter_test |= FTEST_USER;
1644         if (++i < argc) filter_test_ufile = argv[i]; else
1645           {
1646           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1647           exit(EXIT_FAILURE);
1648           }
1649         }
1650       else
1651         {
1652         if (++i >= argc)
1653           {
1654           fprintf(stderr, "exim: string expected after %s\n", arg);
1655           exit(EXIT_FAILURE);
1656           }
1657         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1658         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1659         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1660         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1661         else { badarg = TRUE; break; }
1662         }
1663       }
1664
1665     /* -bh: Host checking - an IP address must follow. */
1666
1667     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1668       {
1669       if (++i >= argc) { badarg = TRUE; break; }
1670       sender_host_address = argv[i];
1671       host_checking = checking = log_testing_mode = TRUE;
1672       host_checking_callout = argrest[1] == 'c';
1673       }
1674
1675     /* -bi: This option is used by sendmail to initialize *the* alias file,
1676     though it has the -oA option to specify a different file. Exim has no
1677     concept of *the* alias file, but since Sun's YP make script calls
1678     sendmail this way, some support must be provided. */
1679
1680     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1681
1682     /* -bm: Accept and deliver message - the default option. Reinstate
1683     receiving_message, which got turned off for all -b options. */
1684
1685     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1686
1687     /* -bmalware: test the filename given for malware */
1688
1689     else if (Ustrcmp(argrest, "malware") == 0)
1690       {
1691       if (++i >= argc) { badarg = TRUE; break; }
1692       malware_test_file = argv[i];
1693       }
1694
1695     /* -bnq: For locally originating messages, do not qualify unqualified
1696     addresses. In the envelope, this causes errors; in header lines they
1697     just get left. */
1698
1699     else if (Ustrcmp(argrest, "nq") == 0)
1700       {
1701       allow_unqualified_sender = FALSE;
1702       allow_unqualified_recipient = FALSE;
1703       }
1704
1705     /* -bpxx: List the contents of the mail queue, in various forms. If
1706     the option is -bpc, just a queue count is needed. Otherwise, if the
1707     first letter after p is r, then order is random. */
1708
1709     else if (*argrest == 'p')
1710       {
1711       if (*(++argrest) == 'c')
1712         {
1713         count_queue = TRUE;
1714         if (*(++argrest) != 0) badarg = TRUE;
1715         break;
1716         }
1717
1718       if (*argrest == 'r')
1719         {
1720         list_queue_option = 8;
1721         argrest++;
1722         }
1723       else list_queue_option = 0;
1724
1725       list_queue = TRUE;
1726
1727       /* -bp: List the contents of the mail queue, top-level only */
1728
1729       if (*argrest == 0) {}
1730
1731       /* -bpu: List the contents of the mail queue, top-level undelivered */
1732
1733       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1734
1735       /* -bpa: List the contents of the mail queue, including all delivered */
1736
1737       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1738
1739       /* Unknown after -bp[r] */
1740
1741       else
1742         {
1743         badarg = TRUE;
1744         break;
1745         }
1746       }
1747
1748
1749     /* -bP: List the configuration variables given as the address list.
1750     Force -v, so configuration errors get displayed. */
1751
1752     else if (Ustrcmp(argrest, "P") == 0)
1753       {
1754       list_options = TRUE;
1755       debug_selector |= D_v;
1756       debug_file = stderr;
1757       }
1758
1759     /* -brt: Test retry configuration lookup */
1760
1761     else if (Ustrcmp(argrest, "rt") == 0)
1762       {
1763       test_retry_arg = i + 1;
1764       goto END_ARG;
1765       }
1766
1767     /* -brw: Test rewrite configuration */
1768
1769     else if (Ustrcmp(argrest, "rw") == 0)
1770       {
1771       test_rewrite_arg = i + 1;
1772       goto END_ARG;
1773       }
1774
1775     /* -bS: Read SMTP commands on standard input, but produce no replies -
1776     all errors are reported by sending messages. */
1777
1778     else if (Ustrcmp(argrest, "S") == 0)
1779       smtp_input = smtp_batched_input = receiving_message = TRUE;
1780
1781     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1782     on standard output. */
1783
1784     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1785
1786     /* -bt: address testing mode */
1787
1788     else if (Ustrcmp(argrest, "t") == 0)
1789       address_test_mode = checking = log_testing_mode = TRUE;
1790
1791     /* -bv: verify addresses */
1792
1793     else if (Ustrcmp(argrest, "v") == 0)
1794       verify_address_mode = checking = log_testing_mode = TRUE;
1795
1796     /* -bvs: verify sender addresses */
1797
1798     else if (Ustrcmp(argrest, "vs") == 0)
1799       {
1800       verify_address_mode = checking = log_testing_mode = TRUE;
1801       verify_as_sender = TRUE;
1802       }
1803
1804     /* -bV: Print version string and support details */
1805
1806     else if (Ustrcmp(argrest, "V") == 0)
1807       {
1808       printf("Exim version %s #%s built %s\n", version_string,
1809         version_cnumber, version_date);
1810       printf("%s\n", CS version_copyright);
1811       version_printed = TRUE;
1812       show_whats_supported(stdout);
1813       }
1814
1815     else badarg = TRUE;
1816     break;
1817
1818
1819     /* -C: change configuration file list; ignore if it isn't really
1820     a change! Enforce a prefix check if required. */
1821
1822     case 'C':
1823     if (*argrest == 0)
1824       {
1825       if(++i < argc) argrest = argv[i]; else
1826         { badarg = TRUE; break; }
1827       }
1828     if (Ustrcmp(config_main_filelist, argrest) != 0)
1829       {
1830       #ifdef ALT_CONFIG_PREFIX
1831       int sep = 0;
1832       int len = Ustrlen(ALT_CONFIG_PREFIX);
1833       uschar *list = argrest;
1834       uschar *filename;
1835       while((filename = string_nextinlist(&list, &sep, big_buffer,
1836              big_buffer_size)) != NULL)
1837         {
1838         if ((Ustrlen(filename) < len ||
1839              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1840              Ustrstr(filename, "/../") != NULL) &&
1841              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1842           {
1843           fprintf(stderr, "-C Permission denied\n");
1844           exit(EXIT_FAILURE);
1845           }
1846         }
1847       #endif
1848       if (real_uid != root_uid)
1849         {
1850         #ifdef TRUSTED_CONFIG_PREFIX_LIST
1851
1852         if (Ustrstr(argrest, "/../"))
1853           trusted_config = FALSE;
1854         else
1855           {
1856           FILE *trust_list = Ufopen(TRUSTED_CONFIG_PREFIX_LIST, "rb");
1857           if (trust_list)
1858             {
1859             struct stat statbuf;
1860
1861             if (fstat(fileno(trust_list), &statbuf) != 0 ||
1862                 (statbuf.st_uid != root_uid        /* owner not root */
1863                  #ifdef CONFIGURE_OWNER
1864                  && statbuf.st_uid != config_uid   /* owner not the special one */
1865                  #endif
1866                    ) ||                            /* or */
1867                 (statbuf.st_gid != root_gid        /* group not root */
1868                  #ifdef CONFIGURE_GROUP
1869                  && statbuf.st_gid != config_gid   /* group not the special one */
1870                  #endif
1871                  && (statbuf.st_mode & 020) != 0   /* group writeable */
1872                    ) ||                            /* or */
1873                 (statbuf.st_mode & 2) != 0)        /* world writeable */
1874               {
1875               trusted_config = FALSE;
1876               fclose(trust_list);
1877               }
1878             else
1879               {
1880               /* Well, the trust list at least is up to scratch... */
1881               void *reset_point = store_get(0);
1882               uschar *trusted_prefixes[32];
1883               int nr_prefixes = 0;
1884               int i = 0;
1885
1886               while (Ufgets(big_buffer, big_buffer_size, trust_list))
1887                 {
1888                 uschar *start = big_buffer, *nl;
1889                 while (*start && isspace(*start))
1890                 start++;
1891                 if (*start != '/')
1892                   continue;
1893                 nl = Ustrchr(start, '\n');
1894                 if (nl)
1895                   *nl = 0;
1896                 trusted_prefixes[nr_prefixes++] = string_copy(start);
1897                 if (nr_prefixes == 32)
1898                   break;
1899                 }
1900               fclose(trust_list);
1901
1902               if (nr_prefixes)
1903                 {
1904                 int sep = 0;
1905                 uschar *list = argrest;
1906                 uschar *filename;
1907                 while (trusted_config && (filename = string_nextinlist(&list,
1908                         &sep, big_buffer, big_buffer_size)) != NULL)
1909                   {
1910                   for (i=0; i < nr_prefixes; i++)
1911                     {
1912                     int len = Ustrlen(trusted_prefixes[i]);
1913                     if (Ustrlen(filename) >= len &&
1914                         Ustrncmp(filename, trusted_prefixes[i], len) == 0)
1915                       break;
1916                     }
1917                   if (i == nr_prefixes)
1918                     {
1919                     trusted_config = FALSE;
1920                     break;
1921                     }
1922                   }
1923                 store_reset(reset_point);
1924                 }
1925               else
1926                 {
1927                 /* No valid prefixes found in trust_list file. */
1928                 trusted_config = FALSE;
1929                 }
1930               }
1931             }
1932           else
1933             {
1934             /* Could not open trust_list file. */
1935             trusted_config = FALSE;
1936             }
1937           }
1938       #else
1939         /* Not root; don't trust config */
1940         trusted_config = FALSE;
1941       #endif
1942         }
1943
1944       config_main_filelist = argrest;
1945       config_changed = TRUE;
1946       }
1947     break;
1948
1949
1950     /* -D: set up a macro definition */
1951
1952     case 'D':
1953     #ifdef DISABLE_D_OPTION
1954     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1955     exit(EXIT_FAILURE);
1956     #else
1957       {
1958       int ptr = 0;
1959       macro_item *mlast = NULL;
1960       macro_item *m;
1961       uschar name[24];
1962       uschar *s = argrest;
1963
1964       while (isspace(*s)) s++;
1965
1966       if (*s < 'A' || *s > 'Z')
1967         {
1968         fprintf(stderr, "exim: macro name set by -D must start with "
1969           "an upper case letter\n");
1970         exit(EXIT_FAILURE);
1971         }
1972
1973       while (isalnum(*s) || *s == '_')
1974         {
1975         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1976         s++;
1977         }
1978       name[ptr] = 0;
1979       if (ptr == 0) { badarg = TRUE; break; }
1980       while (isspace(*s)) s++;
1981       if (*s != 0)
1982         {
1983         if (*s++ != '=') { badarg = TRUE; break; }
1984         while (isspace(*s)) s++;
1985         }
1986
1987       for (m = macros; m != NULL; m = m->next)
1988         {
1989         if (Ustrcmp(m->name, name) == 0)
1990           {
1991           fprintf(stderr, "exim: duplicated -D in command line\n");
1992           exit(EXIT_FAILURE);
1993           }
1994         mlast = m;
1995         }
1996
1997       m = store_get(sizeof(macro_item) + Ustrlen(name));
1998       m->next = NULL;
1999       m->command_line = TRUE;
2000       if (mlast == NULL) macros = m; else mlast->next = m;
2001       Ustrcpy(m->name, name);
2002       m->replacement = string_copy(s);
2003
2004       if (clmacro_count >= MAX_CLMACROS)
2005         {
2006         fprintf(stderr, "exim: too many -D options on command line\n");
2007         exit(EXIT_FAILURE);
2008         }
2009       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2010         m->replacement);
2011       }
2012     #endif
2013     break;
2014
2015     /* -d: Set debug level (see also -v below) or set the drop_cr option.
2016     The latter is now a no-op, retained for compatibility only. If -dd is used,
2017     debugging subprocesses of the daemon is disabled. */
2018
2019     case 'd':
2020     if (Ustrcmp(argrest, "ropcr") == 0)
2021       {
2022       /* drop_cr = TRUE; */
2023       }
2024
2025     /* Use an intermediate variable so that we don't set debugging while
2026     decoding the debugging bits. */
2027
2028     else
2029       {
2030       unsigned int selector = D_default;
2031       debug_selector = 0;
2032       debug_file = NULL;
2033       if (*argrest == 'd')
2034         {
2035         debug_daemon = TRUE;
2036         argrest++;
2037         }
2038       if (*argrest != 0)
2039         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2040           debug_options_count, US"debug", 0);
2041       debug_selector = selector;
2042       }
2043     break;
2044
2045
2046     /* -E: This is a local error message. This option is not intended for
2047     external use at all, but is not restricted to trusted callers because it
2048     does no harm (just suppresses certain error messages) and if Exim is run
2049     not setuid root it won't always be trusted when it generates error
2050     messages using this option. If there is a message id following -E, point
2051     message_reference at it, for logging. */
2052
2053     case 'E':
2054     local_error_message = TRUE;
2055     if (mac_ismsgid(argrest)) message_reference = argrest;
2056     break;
2057
2058
2059     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2060     option, so it looks as if historically the -oex options are also callable
2061     without the leading -o. So we have to accept them. Before the switch,
2062     anything starting -oe has been converted to -e. Exim does not support all
2063     of the sendmail error options. */
2064
2065     case 'e':
2066     if (Ustrcmp(argrest, "e") == 0)
2067       {
2068       arg_error_handling = ERRORS_SENDER;
2069       errors_sender_rc = EXIT_SUCCESS;
2070       }
2071     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2072     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2073     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2074     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2075     else badarg = TRUE;
2076     break;
2077
2078
2079     /* -F: Set sender's full name, used instead of the gecos entry from
2080     the password file. Since users can usually alter their gecos entries,
2081     there's no security involved in using this instead. The data can follow
2082     the -F or be in the next argument. */
2083
2084     case 'F':
2085     if (*argrest == 0)
2086       {
2087       if(++i < argc) argrest = argv[i]; else
2088         { badarg = TRUE; break; }
2089       }
2090     originator_name = argrest;
2091     sender_name_forced = TRUE;
2092     break;
2093
2094
2095     /* -f: Set sender's address - this value is only actually used if Exim is
2096     run by a trusted user, or if untrusted_set_sender is set and matches the
2097     address, except that the null address can always be set by any user. The
2098     test for this happens later, when the value given here is ignored when not
2099     permitted. For an untrusted user, the actual sender is still put in Sender:
2100     if it doesn't match the From: header (unless no_local_from_check is set).
2101     The data can follow the -f or be in the next argument. The -r switch is an
2102     obsolete form of -f but since there appear to be programs out there that
2103     use anything that sendmail has ever supported, better accept it - the
2104     synonymizing is done before the switch above.
2105
2106     At this stage, we must allow domain literal addresses, because we don't
2107     know what the setting of allow_domain_literals is yet. Ditto for trailing
2108     dots and strip_trailing_dot. */
2109
2110     case 'f':
2111       {
2112       int start, end;
2113       uschar *errmess;
2114       if (*argrest == 0)
2115         {
2116         if (i+1 < argc) argrest = argv[++i]; else
2117           { badarg = TRUE; break; }
2118         }
2119       if (*argrest == 0)
2120         {
2121         sender_address = string_sprintf("");  /* Ensure writeable memory */
2122         }
2123       else
2124         {
2125         uschar *temp = argrest + Ustrlen(argrest) - 1;
2126         while (temp >= argrest && isspace(*temp)) temp--;
2127         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2128         allow_domain_literals = TRUE;
2129         strip_trailing_dot = TRUE;
2130         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2131           &sender_address_domain, TRUE);
2132         allow_domain_literals = FALSE;
2133         strip_trailing_dot = FALSE;
2134         if (sender_address == NULL)
2135           {
2136           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2137           return EXIT_FAILURE;
2138           }
2139         }
2140       sender_address_forced = TRUE;
2141       }
2142     break;
2143
2144     /* This is some Sendmail thing which can be ignored */
2145
2146     case 'G':
2147     break;
2148
2149     /* -h: Set the hop count for an incoming message. Exim does not currently
2150     support this; it always computes it by counting the Received: headers.
2151     To put it in will require a change to the spool header file format. */
2152
2153     case 'h':
2154     if (*argrest == 0)
2155       {
2156       if(++i < argc) argrest = argv[i]; else
2157         { badarg = TRUE; break; }
2158       }
2159     if (!isdigit(*argrest)) badarg = TRUE;
2160     break;
2161
2162
2163     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2164     not to be documented for sendmail but mailx (at least) uses it) */
2165
2166     case 'i':
2167     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2168     break;
2169
2170
2171     case 'M':
2172     receiving_message = FALSE;
2173
2174     /* -MC:  continue delivery of another message via an existing open
2175     file descriptor. This option is used for an internal call by the
2176     smtp transport when there is a pending message waiting to go to an
2177     address to which it has got a connection. Five subsequent arguments are
2178     required: transport name, host name, IP address, sequence number, and
2179     message_id. Transports may decline to create new processes if the sequence
2180     number gets too big. The channel is stdin. This (-MC) must be the last
2181     argument. There's a subsequent check that the real-uid is privileged.
2182
2183     If we are running in the test harness. delay for a bit, to let the process
2184     that set this one up complete. This makes for repeatability of the logging,
2185     etc. output. */
2186
2187     if (Ustrcmp(argrest, "C") == 0)
2188       {
2189       union sockaddr_46 interface_sock;
2190       EXIM_SOCKLEN_T size = sizeof(interface_sock);
2191
2192       if (argc != i + 6)
2193         {
2194         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2195         return EXIT_FAILURE;
2196         }
2197
2198       if (msg_action_arg >= 0)
2199         {
2200         fprintf(stderr, "exim: incompatible arguments\n");
2201         return EXIT_FAILURE;
2202         }
2203
2204       continue_transport = argv[++i];
2205       continue_hostname = argv[++i];
2206       continue_host_address = argv[++i];
2207       continue_sequence = Uatoi(argv[++i]);
2208       msg_action = MSG_DELIVER;
2209       msg_action_arg = ++i;
2210       forced_delivery = TRUE;
2211       queue_run_pid = passed_qr_pid;
2212       queue_run_pipe = passed_qr_pipe;
2213
2214       if (!mac_ismsgid(argv[i]))
2215         {
2216         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2217           argv[i]);
2218         return EXIT_FAILURE;
2219         }
2220
2221       /* Set up $sending_ip_address and $sending_port */
2222
2223       if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2224           &size) == 0)
2225         sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2226           &sending_port);
2227       else
2228         {
2229         fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2230           strerror(errno));
2231         return EXIT_FAILURE;
2232         }
2233
2234       if (running_in_test_harness) millisleep(500);
2235       break;
2236       }
2237
2238     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2239     precedes -MC (see above). The flag indicates that the host to which
2240     Exim is connected has accepted an AUTH sequence. */
2241
2242     else if (Ustrcmp(argrest, "CA") == 0)
2243       {
2244       smtp_authenticated = TRUE;
2245       break;
2246       }
2247
2248     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2249     it preceded -MC (see above) */
2250
2251     else if (Ustrcmp(argrest, "CP") == 0)
2252       {
2253       smtp_use_pipelining = TRUE;
2254       break;
2255       }
2256
2257     /* -MCQ: pass on the pid of the queue-running process that started
2258     this chain of deliveries and the fd of its synchronizing pipe; this
2259     is useful only when it precedes -MC (see above) */
2260
2261     else if (Ustrcmp(argrest, "CQ") == 0)
2262       {
2263       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2264         else badarg = TRUE;
2265       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2266         else badarg = TRUE;
2267       break;
2268       }
2269
2270     /* -MCS: set the smtp_use_size flag; this is useful only when it
2271     precedes -MC (see above) */
2272
2273     else if (Ustrcmp(argrest, "CS") == 0)
2274       {
2275       smtp_use_size = TRUE;
2276       break;
2277       }
2278
2279     /* -MCT: set the tls_offered flag; this is useful only when it
2280     precedes -MC (see above). The flag indicates that the host to which
2281     Exim is connected has offered TLS support. */
2282
2283     #ifdef SUPPORT_TLS
2284     else if (Ustrcmp(argrest, "CT") == 0)
2285       {
2286       tls_offered = TRUE;
2287       break;
2288       }
2289     #endif
2290
2291     /* -M[x]: various operations on the following list of message ids:
2292        -M    deliver the messages, ignoring next retry times and thawing
2293        -Mc   deliver the messages, checking next retry times, no thawing
2294        -Mf   freeze the messages
2295        -Mg   give up on the messages
2296        -Mt   thaw the messages
2297        -Mrm  remove the messages
2298     In the above cases, this must be the last option. There are also the
2299     following options which are followed by a single message id, and which
2300     act on that message. Some of them use the "recipient" addresses as well.
2301        -Mar  add recipient(s)
2302        -Mmad mark all recipients delivered
2303        -Mmd  mark recipients(s) delivered
2304        -Mes  edit sender
2305        -Mset load a message for use with -be
2306        -Mvb  show body
2307        -Mvc  show copy (of whole message, in RFC 2822 format)
2308        -Mvh  show header
2309        -Mvl  show log
2310     */
2311
2312     else if (*argrest == 0)
2313       {
2314       msg_action = MSG_DELIVER;
2315       forced_delivery = deliver_force_thaw = TRUE;
2316       }
2317     else if (Ustrcmp(argrest, "ar") == 0)
2318       {
2319       msg_action = MSG_ADD_RECIPIENT;
2320       one_msg_action = TRUE;
2321       }
2322     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2323     else if (Ustrcmp(argrest, "es") == 0)
2324       {
2325       msg_action = MSG_EDIT_SENDER;
2326       one_msg_action = TRUE;
2327       }
2328     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2329     else if (Ustrcmp(argrest, "g") == 0)
2330       {
2331       msg_action = MSG_DELIVER;
2332       deliver_give_up = TRUE;
2333       }
2334     else if (Ustrcmp(argrest, "mad") == 0)
2335       {
2336       msg_action = MSG_MARK_ALL_DELIVERED;
2337       }
2338     else if (Ustrcmp(argrest, "md") == 0)
2339       {
2340       msg_action = MSG_MARK_DELIVERED;
2341       one_msg_action = TRUE;
2342       }
2343     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2344     else if (Ustrcmp(argrest, "set") == 0)
2345       {
2346       msg_action = MSG_LOAD;
2347       one_msg_action = TRUE;
2348       }
2349     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2350     else if (Ustrcmp(argrest, "vb") == 0)
2351       {
2352       msg_action = MSG_SHOW_BODY;
2353       one_msg_action = TRUE;
2354       }
2355     else if (Ustrcmp(argrest, "vc") == 0)
2356       {
2357       msg_action = MSG_SHOW_COPY;
2358       one_msg_action = TRUE;
2359       }
2360     else if (Ustrcmp(argrest, "vh") == 0)
2361       {
2362       msg_action = MSG_SHOW_HEADER;
2363       one_msg_action = TRUE;
2364       }
2365     else if (Ustrcmp(argrest, "vl") == 0)
2366       {
2367       msg_action = MSG_SHOW_LOG;
2368       one_msg_action = TRUE;
2369       }
2370     else { badarg = TRUE; break; }
2371
2372     /* All the -Mxx options require at least one message id. */
2373
2374     msg_action_arg = i + 1;
2375     if (msg_action_arg >= argc)
2376       {
2377       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2378       return EXIT_FAILURE;
2379       }
2380
2381     /* Some require only message ids to follow */
2382
2383     if (!one_msg_action)
2384       {
2385       int j;
2386       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2387         {
2388         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2389           argv[j], arg);
2390         return EXIT_FAILURE;
2391         }
2392       goto END_ARG;   /* Remaining args are ids */
2393       }
2394
2395     /* Others require only one message id, possibly followed by addresses,
2396     which will be handled as normal arguments. */
2397
2398     else
2399       {
2400       if (!mac_ismsgid(argv[msg_action_arg]))
2401         {
2402         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2403           argv[msg_action_arg], arg);
2404         return EXIT_FAILURE;
2405         }
2406       i++;
2407       }
2408     break;
2409
2410
2411     /* Some programs seem to call the -om option without the leading o;
2412     for sendmail it askes for "me too". Exim always does this. */
2413
2414     case 'm':
2415     if (*argrest != 0) badarg = TRUE;
2416     break;
2417
2418
2419     /* -N: don't do delivery - a debugging option that stops transports doing
2420     their thing. It implies debugging at the D_v level. */
2421
2422     case 'N':
2423     if (*argrest == 0)
2424       {
2425       dont_deliver = TRUE;
2426       debug_selector |= D_v;
2427       debug_file = stderr;
2428       }
2429     else badarg = TRUE;
2430     break;
2431
2432
2433     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2434     it. */
2435
2436     case 'n':
2437     break;
2438
2439     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2440     option to the specified value. This form uses long names. We need to handle
2441     -O option=value and -Ooption=value. */
2442
2443     case 'O':
2444     if (*argrest == 0)
2445       {
2446       if (++i >= argc)
2447         {
2448         fprintf(stderr, "exim: string expected after -O\n");
2449         exit(EXIT_FAILURE);
2450         }
2451       }
2452     break;
2453
2454     case 'o':
2455
2456     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2457     file" option). */
2458
2459     if (*argrest == 'A')
2460       {
2461       alias_arg = argrest + 1;
2462       if (alias_arg[0] == 0)
2463         {
2464         if (i+1 < argc) alias_arg = argv[++i]; else
2465           {
2466           fprintf(stderr, "exim: string expected after -oA\n");
2467           exit(EXIT_FAILURE);
2468           }
2469         }
2470       }
2471
2472     /* -oB: Set a connection message max value for remote deliveries */
2473
2474     else if (*argrest == 'B')
2475       {
2476       uschar *p = argrest + 1;
2477       if (p[0] == 0)
2478         {
2479         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2480           {
2481           connection_max_messages = 1;
2482           p = NULL;
2483           }
2484         }
2485
2486       if (p != NULL)
2487         {
2488         if (!isdigit(*p))
2489           {
2490           fprintf(stderr, "exim: number expected after -oB\n");
2491           exit(EXIT_FAILURE);
2492           }
2493         connection_max_messages = Uatoi(p);
2494         }
2495       }
2496
2497     /* -odb: background delivery */
2498
2499     else if (Ustrcmp(argrest, "db") == 0)
2500       {
2501       synchronous_delivery = FALSE;
2502       arg_queue_only = FALSE;
2503       queue_only_set = TRUE;
2504       }
2505
2506     /* -odf: foreground delivery (smail-compatible option); same effect as
2507        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2508     */
2509
2510     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2511       {
2512       synchronous_delivery = TRUE;
2513       arg_queue_only = FALSE;
2514       queue_only_set = TRUE;
2515       }
2516
2517     /* -odq: queue only */
2518
2519     else if (Ustrcmp(argrest, "dq") == 0)
2520       {
2521       synchronous_delivery = FALSE;
2522       arg_queue_only = TRUE;
2523       queue_only_set = TRUE;
2524       }
2525
2526     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2527     but no remote delivery */
2528
2529     else if (Ustrcmp(argrest, "dqs") == 0)
2530       {
2531       queue_smtp = TRUE;
2532       arg_queue_only = FALSE;
2533       queue_only_set = TRUE;
2534       }
2535
2536     /* -oex: Sendmail error flags. As these are also accepted without the
2537     leading -o prefix, for compatibility with vacation and other callers,
2538     they are handled with -e above. */
2539
2540     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2541        -oitrue: Another sendmail syntax for the same */
2542
2543     else if (Ustrcmp(argrest, "i") == 0 ||
2544              Ustrcmp(argrest, "itrue") == 0)
2545       dot_ends = FALSE;
2546
2547     /* -oM*: Set various characteristics for an incoming message; actually
2548     acted on for trusted callers only. */
2549
2550     else if (*argrest == 'M')
2551       {
2552       if (i+1 >= argc)
2553         {
2554         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2555         exit(EXIT_FAILURE);
2556         }
2557
2558       /* -oMa: Set sender host address */
2559
2560       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2561
2562       /* -oMaa: Set authenticator name */
2563
2564       else if (Ustrcmp(argrest, "Maa") == 0)
2565         sender_host_authenticated = argv[++i];
2566
2567       /* -oMas: setting authenticated sender */
2568
2569       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2570
2571       /* -oMai: setting authenticated id */
2572
2573       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2574
2575       /* -oMi: Set incoming interface address */
2576
2577       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2578
2579       /* -oMr: Received protocol */
2580
2581       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2582
2583       /* -oMs: Set sender host name */
2584
2585       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2586
2587       /* -oMt: Set sender ident */
2588
2589       else if (Ustrcmp(argrest, "Mt") == 0)
2590         {
2591         sender_ident_set = TRUE;
2592         sender_ident = argv[++i];
2593         }
2594
2595       /* Else a bad argument */
2596
2597       else
2598         {
2599         badarg = TRUE;
2600         break;
2601         }
2602       }
2603
2604     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2605     seem to call this as -m (undocumented), so that is also accepted (see
2606     above). */
2607
2608     else if (Ustrcmp(argrest, "m") == 0) {}
2609
2610     /* -oo: An ancient flag for old-style addresses which still seems to
2611     crop up in some calls (see in SCO). */
2612
2613     else if (Ustrcmp(argrest, "o") == 0) {}
2614
2615     /* -oP <name>: set pid file path for daemon */
2616
2617     else if (Ustrcmp(argrest, "P") == 0)
2618       override_pid_file_path = argv[++i];
2619
2620     /* -or <n>: set timeout for non-SMTP acceptance
2621        -os <n>: set timeout for SMTP acceptance */
2622
2623     else if (*argrest == 'r' || *argrest == 's')
2624       {
2625       int *tp = (*argrest == 'r')?
2626         &arg_receive_timeout : &arg_smtp_receive_timeout;
2627       if (argrest[1] == 0)
2628         {
2629         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2630         }
2631       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2632       if (*tp < 0)
2633         {
2634         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2635         exit(EXIT_FAILURE);
2636         }
2637       }
2638
2639     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2640
2641     else if (Ustrcmp(argrest, "X") == 0)
2642       override_local_interfaces = argv[++i];
2643
2644     /* Unknown -o argument */
2645
2646     else badarg = TRUE;
2647     break;
2648
2649
2650     /* -ps: force Perl startup; -pd force delayed Perl startup */
2651
2652     case 'p':
2653     #ifdef EXIM_PERL
2654     if (*argrest == 's' && argrest[1] == 0)
2655       {
2656       perl_start_option = 1;
2657       break;
2658       }
2659     if (*argrest == 'd' && argrest[1] == 0)
2660       {
2661       perl_start_option = -1;
2662       break;
2663       }
2664     #endif
2665
2666     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2667     which sets the host protocol and host name */
2668
2669     if (*argrest == 0)
2670       {
2671       if (i+1 < argc) argrest = argv[++i]; else
2672         { badarg = TRUE; break; }
2673       }
2674
2675     if (*argrest != 0)
2676       {
2677       uschar *hn = Ustrchr(argrest, ':');
2678       if (hn == NULL)
2679         {
2680         received_protocol = argrest;
2681         }
2682       else
2683         {
2684         received_protocol = string_copyn(argrest, hn - argrest);
2685         sender_host_name = hn + 1;
2686         }
2687       }
2688     break;
2689
2690
2691     case 'q':
2692     receiving_message = FALSE;
2693     if (queue_interval >= 0)
2694       {
2695       fprintf(stderr, "exim: -q specified more than once\n");
2696       exit(EXIT_FAILURE);
2697       }
2698
2699     /* -qq...: Do queue runs in a 2-stage manner */
2700
2701     if (*argrest == 'q')
2702       {
2703       queue_2stage = TRUE;
2704       argrest++;
2705       }
2706
2707     /* -qi...: Do only first (initial) deliveries */
2708
2709     if (*argrest == 'i')
2710       {
2711       queue_run_first_delivery = TRUE;
2712       argrest++;
2713       }
2714
2715     /* -qf...: Run the queue, forcing deliveries
2716        -qff..: Ditto, forcing thawing as well */
2717
2718     if (*argrest == 'f')
2719       {
2720       queue_run_force = TRUE;
2721       if (*(++argrest) == 'f')
2722         {
2723         deliver_force_thaw = TRUE;
2724         argrest++;
2725         }
2726       }
2727
2728     /* -q[f][f]l...: Run the queue only on local deliveries */
2729
2730     if (*argrest == 'l')
2731       {
2732       queue_run_local = TRUE;
2733       argrest++;
2734       }
2735
2736     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2737     optionally starting from a given message id. */
2738
2739     if (*argrest == 0 &&
2740         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2741       {
2742       queue_interval = 0;
2743       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2744         start_queue_run_id = argv[++i];
2745       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2746         stop_queue_run_id = argv[++i];
2747       }
2748
2749     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2750     optionally local only. */
2751
2752     else
2753       {
2754       if (*argrest != 0)
2755         queue_interval = readconf_readtime(argrest, 0, FALSE);
2756       else
2757         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2758       if (queue_interval <= 0)
2759         {
2760         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2761         exit(EXIT_FAILURE);
2762         }
2763       }
2764     break;
2765
2766
2767     case 'R':   /* Synonymous with -qR... */
2768     receiving_message = FALSE;
2769
2770     /* -Rf:   As -R (below) but force all deliveries,
2771        -Rff:  Ditto, but also thaw all frozen messages,
2772        -Rr:   String is regex
2773        -Rrf:  Regex and force
2774        -Rrff: Regex and force and thaw
2775
2776     in all cases provided there are no further characters in this
2777     argument. */
2778
2779     if (*argrest != 0)
2780       {
2781       int i;
2782       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2783         {
2784         if (Ustrcmp(argrest, rsopts[i]) == 0)
2785           {
2786           if (i != 2) queue_run_force = TRUE;
2787           if (i >= 2) deliver_selectstring_regex = TRUE;
2788           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2789           argrest += Ustrlen(rsopts[i]);
2790           }
2791         }
2792       }
2793
2794     /* -R: Set string to match in addresses for forced queue run to
2795     pick out particular messages. */
2796
2797     if (*argrest == 0)
2798       {
2799       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2800         {
2801         fprintf(stderr, "exim: string expected after -R\n");
2802         exit(EXIT_FAILURE);
2803         }
2804       }
2805     else deliver_selectstring = argrest;
2806     break;
2807
2808
2809     /* -r: an obsolete synonym for -f (see above) */
2810
2811
2812     /* -S: Like -R but works on sender. */
2813
2814     case 'S':   /* Synonymous with -qS... */
2815     receiving_message = FALSE;
2816
2817     /* -Sf:   As -S (below) but force all deliveries,
2818        -Sff:  Ditto, but also thaw all frozen messages,
2819        -Sr:   String is regex
2820        -Srf:  Regex and force
2821        -Srff: Regex and force and thaw
2822
2823     in all cases provided there are no further characters in this
2824     argument. */
2825
2826     if (*argrest != 0)
2827       {
2828       int i;
2829       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2830         {
2831         if (Ustrcmp(argrest, rsopts[i]) == 0)
2832           {
2833           if (i != 2) queue_run_force = TRUE;
2834           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2835           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2836           argrest += Ustrlen(rsopts[i]);
2837           }
2838         }
2839       }
2840
2841     /* -S: Set string to match in addresses for forced queue run to
2842     pick out particular messages. */
2843
2844     if (*argrest == 0)
2845       {
2846       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2847         {
2848         fprintf(stderr, "exim: string expected after -S\n");
2849         exit(EXIT_FAILURE);
2850         }
2851       }
2852     else deliver_selectstring_sender = argrest;
2853     break;
2854
2855     /* -Tqt is an option that is exclusively for use by the testing suite.
2856     It is not recognized in other circumstances. It allows for the setting up
2857     of explicit "queue times" so that various warning/retry things can be
2858     tested. Otherwise variability of clock ticks etc. cause problems. */
2859
2860     case 'T':
2861     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2862       fudged_queue_times = argv[++i];
2863     else badarg = TRUE;
2864     break;
2865
2866
2867     /* -t: Set flag to extract recipients from body of message. */
2868
2869     case 't':
2870     if (*argrest == 0) extract_recipients = TRUE;
2871
2872     /* -ti: Set flag to extract recipients from body of message, and also
2873     specify that dot does not end the message. */
2874
2875     else if (Ustrcmp(argrest, "i") == 0)
2876       {
2877       extract_recipients = TRUE;
2878       dot_ends = FALSE;
2879       }
2880
2881     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2882
2883     #ifdef SUPPORT_TLS
2884     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2885     #endif
2886
2887     else badarg = TRUE;
2888     break;
2889
2890
2891     /* -U: This means "initial user submission" in sendmail, apparently. The
2892     doc claims that in future sendmail may refuse syntactically invalid
2893     messages instead of fixing them. For the moment, we just ignore it. */
2894
2895     case 'U':
2896     break;
2897
2898
2899     /* -v: verify things - this is a very low-level debugging */
2900
2901     case 'v':
2902     if (*argrest == 0)
2903       {
2904       debug_selector |= D_v;
2905       debug_file = stderr;
2906       }
2907     else badarg = TRUE;
2908     break;
2909
2910
2911     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2912
2913       The -x flag tells the sendmail command that mail from a local
2914       mail program has National Language Support (NLS) extended characters
2915       in the body of the mail item. The sendmail command can send mail with
2916       extended NLS characters across networks that normally corrupts these
2917       8-bit characters.
2918
2919     As Exim is 8-bit clean, it just ignores this flag. */
2920
2921     case 'x':
2922     if (*argrest != 0) badarg = TRUE;
2923     break;
2924
2925     /* All other initial characters are errors */
2926
2927     default:
2928     badarg = TRUE;
2929     break;
2930     }         /* End of high-level switch statement */
2931
2932   /* Failed to recognize the option, or syntax error */
2933
2934   if (badarg)
2935     {
2936     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2937       "option %s\n", arg);
2938     exit(EXIT_FAILURE);
2939     }
2940   }
2941
2942
2943 /* If -R or -S have been specified without -q, assume a single queue run. */
2944
2945 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2946   queue_interval < 0) queue_interval = 0;
2947
2948
2949 END_ARG:
2950 /* If usage_wanted is set we call the usage function - which never returns */
2951 if (usage_wanted) exim_usage(called_as);
2952
2953 /* Arguments have been processed. Check for incompatibilities. */
2954 if ((
2955     (smtp_input || extract_recipients || recipients_arg < argc) &&
2956     (daemon_listen || queue_interval >= 0 || bi_option ||
2957       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2958       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2959     ) ||
2960     (
2961     msg_action_arg > 0 &&
2962     (daemon_listen || queue_interval >= 0 || list_options ||
2963       (checking && msg_action != MSG_LOAD) ||
2964       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2965     ) ||
2966     (
2967     (daemon_listen || queue_interval >= 0) &&
2968     (sender_address != NULL || list_options || list_queue || checking ||
2969       bi_option)
2970     ) ||
2971     (
2972     daemon_listen && queue_interval == 0
2973     ) ||
2974     (
2975     list_options &&
2976     (checking || smtp_input || extract_recipients ||
2977       filter_test != FTEST_NONE || bi_option)
2978     ) ||
2979     (
2980     verify_address_mode &&
2981     (address_test_mode || smtp_input || extract_recipients ||
2982       filter_test != FTEST_NONE || bi_option)
2983     ) ||
2984     (
2985     address_test_mode && (smtp_input || extract_recipients ||
2986       filter_test != FTEST_NONE || bi_option)
2987     ) ||
2988     (
2989     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2990       extract_recipients)
2991     ) ||
2992     (
2993     deliver_selectstring != NULL && queue_interval < 0
2994     ) ||
2995     (
2996     msg_action == MSG_LOAD &&
2997       (!expansion_test || expansion_test_message != NULL)
2998     )
2999    )
3000   {
3001   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3002   exit(EXIT_FAILURE);
3003   }
3004
3005 /* If debugging is set up, set the file and the file descriptor to pass on to
3006 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3007 to run in the foreground. */
3008
3009 if (debug_selector != 0)
3010   {
3011   debug_file = stderr;
3012   debug_fd = fileno(debug_file);
3013   background_daemon = FALSE;
3014   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
3015   if (debug_selector != D_v)    /* -v only doesn't show this */
3016     {
3017     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3018       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3019       debug_selector);
3020     show_whats_supported(stderr);
3021     }
3022   }
3023
3024 /* When started with root privilege, ensure that the limits on the number of
3025 open files and the number of processes (where that is accessible) are
3026 sufficiently large, or are unset, in case Exim has been called from an
3027 environment where the limits are screwed down. Not all OS have the ability to
3028 change some of these limits. */
3029
3030 if (unprivileged)
3031   {
3032   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3033   }
3034 else
3035   {
3036   struct rlimit rlp;
3037
3038   #ifdef RLIMIT_NOFILE
3039   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3040     {
3041     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3042       strerror(errno));
3043     rlp.rlim_cur = rlp.rlim_max = 0;
3044     }
3045
3046   /* I originally chose 1000 as a nice big number that was unlikely to
3047   be exceeded. It turns out that some older OS have a fixed upper limit of
3048   256. */
3049
3050   if (rlp.rlim_cur < 1000)
3051     {
3052     rlp.rlim_cur = rlp.rlim_max = 1000;
3053     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3054       {
3055       rlp.rlim_cur = rlp.rlim_max = 256;
3056       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3057         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3058           strerror(errno));
3059       }
3060     }
3061   #endif
3062
3063   #ifdef RLIMIT_NPROC
3064   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3065     {
3066     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3067       strerror(errno));
3068     rlp.rlim_cur = rlp.rlim_max = 0;
3069     }
3070
3071   #ifdef RLIM_INFINITY
3072   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3073     {
3074     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3075   #else
3076   if (rlp.rlim_cur < 1000)
3077     {
3078     rlp.rlim_cur = rlp.rlim_max = 1000;
3079   #endif
3080     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3081       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3082         strerror(errno));
3083     }
3084   #endif
3085   }
3086
3087 /* Exim is normally entered as root (but some special configurations are
3088 possible that don't do this). However, it always spins off sub-processes that
3089 set their uid and gid as required for local delivery. We don't want to pass on
3090 any extra groups that root may belong to, so we want to get rid of them all at
3091 this point.
3092
3093 We need to obey setgroups() at this stage, before possibly giving up root
3094 privilege for a changed configuration file, but later on we might need to
3095 check on the additional groups for the admin user privilege - can't do that
3096 till after reading the config, which might specify the exim gid. Therefore,
3097 save the group list here first. */
3098
3099 group_count = getgroups(NGROUPS_MAX, group_list);
3100
3101 /* There is a fundamental difference in some BSD systems in the matter of
3102 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3103 known not to be different. On the "different" systems there is a single group
3104 list, and the first entry in it is the current group. On all other versions of
3105 Unix there is a supplementary group list, which is in *addition* to the current
3106 group. Consequently, to get rid of all extraneous groups on a "standard" system
3107 you pass over 0 groups to setgroups(), while on a "different" system you pass
3108 over a single group - the current group, which is always the first group in the
3109 list. Calling setgroups() with zero groups on a "different" system results in
3110 an error return. The following code should cope with both types of system.
3111
3112 However, if this process isn't running as root, setgroups() can't be used
3113 since you have to be root to run it, even if throwing away groups. Not being
3114 root here happens only in some unusual configurations. We just ignore the
3115 error. */
3116
3117 if (setgroups(0, NULL) != 0)
3118   {
3119   if (setgroups(1, group_list) != 0 && !unprivileged)
3120     {
3121     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3122     exit(EXIT_FAILURE);
3123     }
3124   }
3125
3126 /* If the configuration file name has been altered by an argument on the
3127 command line (either a new file name or a macro definition) and the caller is
3128 not root, or if this is a filter testing run, remove any setuid privilege the
3129 program has and run as the underlying user.
3130
3131 The exim user is locked out of this, which severely restricts the use of -C
3132 for some purposes.
3133
3134 Otherwise, set the real ids to the effective values (should be root unless run
3135 from inetd, which it can either be root or the exim uid, if one is configured).
3136
3137 There is a private mechanism for bypassing some of this, in order to make it
3138 possible to test lots of configurations automatically, without having either to
3139 recompile each time, or to patch in an actual configuration file name and other
3140 values (such as the path name). If running in the test harness, pretend that
3141 configuration file changes and macro definitions haven't happened. */
3142
3143 if ((                                            /* EITHER */
3144     (!trusted_config || macros != NULL) &&       /* Config changed, and */
3145     real_uid != root_uid &&                      /* Not root, and */
3146     !running_in_test_harness                     /* Not fudged */
3147     ) ||                                         /*   OR   */
3148     expansion_test                               /* expansion testing */
3149     ||                                           /*   OR   */
3150     filter_test != FTEST_NONE)                   /* Filter testing */
3151   {
3152   setgroups(group_count, group_list);
3153   exim_setugid(real_uid, real_gid, FALSE,
3154     US"-C, -D, -be or -bf forces real uid");
3155   removed_privilege = TRUE;
3156
3157   /* In the normal case when Exim is called like this, stderr is available
3158   and should be used for any logging information because attempts to write
3159   to the log will usually fail. To arrange this, we unset really_exim. However,
3160   if no stderr is available there is no point - we might as well have a go
3161   at the log (if it fails, syslog will be written). */
3162
3163   if (log_stderr != NULL) really_exim = FALSE;
3164   }
3165
3166 /* Privilege is to be retained for the moment. It may be dropped later,
3167 depending on the job that this Exim process has been asked to do. For now, set
3168 the real uid to the effective so that subsequent re-execs of Exim are done by a
3169 privileged user. */
3170
3171 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3172
3173 /* If testing a filter, open the file(s) now, before wasting time doing other
3174 setups and reading the message. */
3175
3176 if ((filter_test & FTEST_SYSTEM) != 0)
3177   {
3178   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3179   if (filter_sfd < 0)
3180     {
3181     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3182       strerror(errno));
3183     return EXIT_FAILURE;
3184     }
3185   }
3186
3187 if ((filter_test & FTEST_USER) != 0)
3188   {
3189   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3190   if (filter_ufd < 0)
3191     {
3192     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3193       strerror(errno));
3194     return EXIT_FAILURE;
3195     }
3196   }
3197
3198 /* Read the main runtime configuration data; this gives up if there
3199 is a failure. It leaves the configuration file open so that the subsequent
3200 configuration data for delivery can be read if needed. */
3201
3202 readconf_main();
3203
3204 /* Handle the decoding of logging options. */
3205
3206 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3207   log_selector_string, log_options, log_options_count, US"log", 0);
3208
3209 DEBUG(D_any)
3210   {
3211   debug_printf("configuration file is %s\n", config_main_filename);
3212   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3213     log_extra_selector);
3214   }
3215
3216 /* If domain literals are not allowed, check the sender address that was
3217 supplied with -f. Ditto for a stripped trailing dot. */
3218
3219 if (sender_address != NULL)
3220   {
3221   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3222     {
3223     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3224       "allowed\n", sender_address);
3225     return EXIT_FAILURE;
3226     }
3227   if (f_end_dot && !strip_trailing_dot)
3228     {
3229     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3230       "(trailing dot not allowed)\n", sender_address);
3231     return EXIT_FAILURE;
3232     }
3233   }
3234
3235 /* Paranoia check of maximum lengths of certain strings. There is a check
3236 on the length of the log file path in log.c, which will come into effect
3237 if there are any calls to write the log earlier than this. However, if we
3238 get this far but the string is very long, it is better to stop now than to
3239 carry on and (e.g.) receive a message and then have to collapse. The call to
3240 log_write() from here will cause the ultimate panic collapse if the complete
3241 file name exceeds the buffer length. */
3242
3243 if (Ustrlen(log_file_path) > 200)
3244   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3245     "log_file_path is longer than 200 chars: aborting");
3246
3247 if (Ustrlen(pid_file_path) > 200)
3248   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3249     "pid_file_path is longer than 200 chars: aborting");
3250
3251 if (Ustrlen(spool_directory) > 200)
3252   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3253     "spool_directory is longer than 200 chars: aborting");
3254
3255 /* Length check on the process name given to syslog for its TAG field,
3256 which is only permitted to be 32 characters or less. See RFC 3164. */
3257
3258 if (Ustrlen(syslog_processname) > 32)
3259   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3260     "syslog_processname is longer than 32 chars: aborting");
3261
3262 /* In some operating systems, the environment variable TMPDIR controls where
3263 temporary files are created; Exim doesn't use these (apart from when delivering
3264 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3265 If TMPDIR is found in the environment, reset it to the value defined in the
3266 TMPDIR macro, if this macro is defined. */
3267
3268 #ifdef TMPDIR
3269   {
3270   uschar **p;
3271   for (p = USS environ; *p != NULL; p++)
3272     {
3273     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3274         Ustrcmp(*p+7, TMPDIR) != 0)
3275       {
3276       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3277       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3278       *p = newp;
3279       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3280       }
3281     }
3282   }
3283 #endif
3284
3285 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3286 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3287 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3288 called by a user who has set the TZ variable. This then affects the timestamps
3289 in log files and in Received: headers, and any created Date: header lines. The
3290 required timezone is settable in the configuration file, so nothing can be done
3291 about this earlier - but hopefully nothing will normally be logged earlier than
3292 this. We have to make a new environment if TZ is wrong, but don't bother if
3293 timestamps_utc is set, because then all times are in UTC anyway. */
3294
3295 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3296   {
3297   timestamps_utc = TRUE;
3298   }
3299 else
3300   {
3301   uschar *envtz = US getenv("TZ");
3302   if ((envtz == NULL && timezone_string != NULL) ||
3303       (envtz != NULL &&
3304         (timezone_string == NULL ||
3305          Ustrcmp(timezone_string, envtz) != 0)))
3306     {
3307     uschar **p = USS environ;
3308     uschar **new;
3309     uschar **newp;
3310     int count = 0;
3311     while (*p++ != NULL) count++;
3312     if (envtz == NULL) count++;
3313     newp = new = malloc(sizeof(uschar *) * (count + 1));
3314     for (p = USS environ; *p != NULL; p++)
3315       {
3316       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3317       *newp++ = *p;
3318       }
3319     if (timezone_string != NULL)
3320       {
3321       *newp = malloc(Ustrlen(timezone_string) + 4);
3322       sprintf(CS *newp++, "TZ=%s", timezone_string);
3323       }
3324     *newp = NULL;
3325     environ = CSS new;
3326     tzset();
3327     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3328       tod_stamp(tod_log));
3329     }
3330   }
3331
3332 /* Handle the case when we have removed the setuid privilege because of -C or
3333 -D. This means that the caller of Exim was not root.
3334
3335 There is a problem if we were running as the Exim user. The sysadmin may
3336 expect this case to retain privilege because "the binary was called by the
3337 Exim user", but it hasn't, because either the -D option set macros, or the
3338 -C option set a non-trusted configuration file. There are two possibilities:
3339
3340   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3341       to do message deliveries. Thus, the fact that it is running as a
3342       non-privileged user is plausible, and might be wanted in some special
3343       configurations. However, really_exim will have been set false when
3344       privilege was dropped, to stop Exim trying to write to its normal log
3345       files. Therefore, re-enable normal log processing, assuming the sysadmin
3346       has set up the log directory correctly.
3347
3348   (2) If deliver_drop_privilege is not set, the configuration won't work as
3349       apparently intended, and so we log a panic message. In order to retain
3350       root for -C or -D, the caller must either be root or be invoking a
3351       trusted configuration file (when deliver_drop_privilege is false). */
3352
3353 if (removed_privilege && (!trusted_config || macros != NULL) &&
3354     real_uid == exim_uid)
3355   {
3356   if (deliver_drop_privilege)
3357     really_exim = TRUE; /* let logging work normally */
3358   else
3359     log_write(0, LOG_MAIN|LOG_PANIC,
3360       "exim user lost privilege for using %s option",
3361       (int)exim_uid, trusted_config? "-D" : "-C");
3362   }
3363
3364 /* Start up Perl interpreter if Perl support is configured and there is a
3365 perl_startup option, and the configuration or the command line specifies
3366 initializing starting. Note that the global variables are actually called
3367 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3368
3369 #ifdef EXIM_PERL
3370 if (perl_start_option != 0)
3371   opt_perl_at_start = (perl_start_option > 0);
3372 if (opt_perl_at_start && opt_perl_startup != NULL)
3373   {
3374   uschar *errstr;
3375   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3376   errstr = init_perl(opt_perl_startup);
3377   if (errstr != NULL)
3378     {
3379     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3380     return EXIT_FAILURE;
3381     }
3382   opt_perl_started = TRUE;
3383   }
3384 #endif /* EXIM_PERL */
3385
3386 /* Log the arguments of the call if the configuration file said so. This is
3387 a debugging feature for finding out what arguments certain MUAs actually use.
3388 Don't attempt it if logging is disabled, or if listing variables or if
3389 verifying/testing addresses or expansions. */
3390
3391 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3392       && really_exim && !list_options && !checking)
3393   {
3394   int i;
3395   uschar *p = big_buffer;
3396   Ustrcpy(p, "cwd=");
3397   (void)getcwd(CS p+4, big_buffer_size - 4);
3398   while (*p) p++;
3399   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3400   while (*p) p++;
3401   for (i = 0; i < argc; i++)
3402     {
3403     int len = Ustrlen(argv[i]);
3404     uschar *printing;
3405     uschar *quote;
3406     if (p + len + 8 >= big_buffer + big_buffer_size)
3407       {
3408       Ustrcpy(p, " ...");
3409       log_write(0, LOG_MAIN, "%s", big_buffer);
3410       Ustrcpy(big_buffer, "...");
3411       p = big_buffer + 3;
3412       }
3413     printing = string_printing(argv[i]);
3414     if (printing[0] == 0) quote = US"\""; else
3415       {
3416       uschar *pp = printing;
3417       quote = US"";
3418       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3419       }
3420     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3421       (p - big_buffer) - 4), printing, quote);
3422     while (*p) p++;
3423     }
3424
3425   if ((log_extra_selector & LX_arguments) != 0)
3426     log_write(0, LOG_MAIN, "%s", big_buffer);
3427   else
3428     debug_printf("%s\n", big_buffer);
3429   }
3430
3431 /* Set the working directory to be the top-level spool directory. We don't rely
3432 on this in the code, which always uses fully qualified names, but it's useful
3433 for core dumps etc. Don't complain if it fails - the spool directory might not
3434 be generally accessible and calls with the -C option (and others) have lost
3435 privilege by now. Before the chdir, we try to ensure that the directory exists.
3436 */
3437
3438 if (Uchdir(spool_directory) != 0)
3439   {
3440   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3441   (void)Uchdir(spool_directory);
3442   }
3443
3444 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3445 alias file. Exim doesn't have such a concept, but this call is screwed into
3446 Sun's YP makefiles. Handle this by calling a configured script, as the real
3447 user who called Exim. The -oA option can be used to pass an argument to the
3448 script. */
3449
3450 if (bi_option)
3451   {
3452   (void)fclose(config_file);
3453   if (bi_command != NULL)
3454     {
3455     int i = 0;
3456     uschar *argv[3];
3457     argv[i++] = bi_command;
3458     if (alias_arg != NULL) argv[i++] = alias_arg;
3459     argv[i++] = NULL;
3460
3461     setgroups(group_count, group_list);
3462     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3463
3464     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3465       (argv[1] == NULL)? US"" : argv[1]);
3466
3467     execv(CS argv[0], (char *const *)argv);
3468     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3469     exit(EXIT_FAILURE);
3470     }
3471   else
3472     {
3473     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3474     exit(EXIT_SUCCESS);
3475     }
3476   }
3477
3478 /* If an action on specific messages is requested, or if a daemon or queue
3479 runner is being started, we need to know if Exim was called by an admin user.
3480 This is the case if the real user is root or exim, or if the real group is
3481 exim, or if one of the supplementary groups is exim or a group listed in
3482 admin_groups. We don't fail all message actions immediately if not admin_user,
3483 since some actions can be performed by non-admin users. Instead, set admin_user
3484 for later interrogation. */
3485
3486 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3487   admin_user = TRUE;
3488 else
3489   {
3490   int i, j;
3491   for (i = 0; i < group_count; i++)
3492     {
3493     if (group_list[i] == exim_gid) admin_user = TRUE;
3494     else if (admin_groups != NULL)
3495       {
3496       for (j = 1; j <= (int)(admin_groups[0]); j++)
3497         if (admin_groups[j] == group_list[i])
3498           { admin_user = TRUE; break; }
3499       }
3500     if (admin_user) break;
3501     }
3502   }
3503
3504 /* Another group of privileged users are the trusted users. These are root,
3505 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3506 are permitted to specify sender_addresses with -f on the command line, and
3507 other message parameters as well. */
3508
3509 if (real_uid == root_uid || real_uid == exim_uid)
3510   trusted_caller = TRUE;
3511 else
3512   {
3513   int i, j;
3514
3515   if (trusted_users != NULL)
3516     {
3517     for (i = 1; i <= (int)(trusted_users[0]); i++)
3518       if (trusted_users[i] == real_uid)
3519         { trusted_caller = TRUE; break; }
3520     }
3521
3522   if (!trusted_caller && trusted_groups != NULL)
3523     {
3524     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3525       {
3526       if (trusted_groups[i] == real_gid)
3527         trusted_caller = TRUE;
3528       else for (j = 0; j < group_count; j++)
3529         {
3530         if (trusted_groups[i] == group_list[j])
3531           { trusted_caller = TRUE; break; }
3532         }
3533       if (trusted_caller) break;
3534       }
3535     }
3536   }
3537
3538 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3539 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3540
3541 /* Only an admin user may start the daemon or force a queue run in the default
3542 configuration, but the queue run restriction can be relaxed. Only an admin
3543 user may request that a message be returned to its sender forthwith. Only an
3544 admin user may specify a debug level greater than D_v (because it might show
3545 passwords, etc. in lookup queries). Only an admin user may request a queue
3546 count. Only an admin user can use the test interface to scan for email
3547 (because Exim will be in the spool dir and able to look at mails). */
3548
3549 if (!admin_user)
3550   {
3551   BOOL debugset = (debug_selector & ~D_v) != 0;
3552   if (deliver_give_up || daemon_listen || malware_test_file ||
3553      (count_queue && queue_list_requires_admin) ||
3554      (list_queue && queue_list_requires_admin) ||
3555      (queue_interval >= 0 && prod_requires_admin) ||
3556      (debugset && !running_in_test_harness))
3557     {
3558     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3559     exit(EXIT_FAILURE);
3560     }
3561   }
3562
3563 /* If the real user is not root or the exim uid, the argument for passing
3564 in an open TCP/IP connection for another message is not permitted, nor is
3565 running with the -N option for any delivery action, unless this call to exim is
3566 one that supplied an input message, or we are using a patched exim for
3567 regression testing. */
3568
3569 if (real_uid != root_uid && real_uid != exim_uid &&
3570      (continue_hostname != NULL ||
3571        (dont_deliver &&
3572          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3573        )) && !running_in_test_harness)
3574   {
3575   fprintf(stderr, "exim: Permission denied\n");
3576   return EXIT_FAILURE;
3577   }
3578
3579 /* If the caller is not trusted, certain arguments are ignored when running for
3580 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3581 Note that authority for performing certain actions on messages is tested in the
3582 queue_action() function. */
3583
3584 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3585   {
3586   sender_host_name = sender_host_address = interface_address =
3587     sender_ident = received_protocol = NULL;
3588   sender_host_port = interface_port = 0;
3589   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3590   }
3591
3592 /* If a sender host address is set, extract the optional port number off the
3593 end of it and check its syntax. Do the same thing for the interface address.
3594 Exim exits if the syntax is bad. */
3595
3596 else
3597   {
3598   if (sender_host_address != NULL)
3599     sender_host_port = check_port(sender_host_address);
3600   if (interface_address != NULL)
3601     interface_port = check_port(interface_address);
3602   }
3603
3604 /* If an SMTP message is being received check to see if the standard input is a
3605 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3606 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3607 barf. */
3608
3609 if (smtp_input)
3610   {
3611   union sockaddr_46 inetd_sock;
3612   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3613   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3614     {
3615     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3616     if (family == AF_INET || family == AF_INET6)
3617       {
3618       union sockaddr_46 interface_sock;
3619       size = sizeof(interface_sock);
3620
3621       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3622         interface_address = host_ntoa(-1, &interface_sock, NULL,
3623           &interface_port);
3624
3625       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3626
3627       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3628         {
3629         is_inetd = TRUE;
3630         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3631           NULL, &sender_host_port);
3632         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3633           "inetd is not supported when mua_wrapper is set");
3634         }
3635       else
3636         {
3637         fprintf(stderr,
3638           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3639         return EXIT_FAILURE;
3640         }
3641       }
3642     }
3643   }
3644
3645 /* If the load average is going to be needed while receiving a message, get it
3646 now for those OS that require the first call to os_getloadavg() to be done as
3647 root. There will be further calls later for each message received. */
3648
3649 #ifdef LOAD_AVG_NEEDS_ROOT
3650 if (receiving_message &&
3651       (queue_only_load >= 0 ||
3652         (is_inetd && smtp_load_reserve >= 0)
3653       ))
3654   {
3655   load_average = OS_GETLOADAVG();
3656   }
3657 #endif
3658
3659 /* The queue_only configuration option can be overridden by -odx on the command
3660 line, except that if queue_only_override is false, queue_only cannot be unset
3661 from the command line. */
3662
3663 if (queue_only_set && (queue_only_override || arg_queue_only))
3664   queue_only = arg_queue_only;
3665
3666 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3667 -or and -os. */
3668
3669 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3670 if (arg_smtp_receive_timeout >= 0)
3671   smtp_receive_timeout = arg_smtp_receive_timeout;
3672
3673 /* If Exim was started with root privilege, unless we have already removed the
3674 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3675 except when starting the daemon or doing some kind of delivery or address
3676 testing (-bt). These are the only cases when root need to be retained. We run
3677 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3678 retained only for starting the daemon. We always do the initgroups() in this
3679 situation (controlled by the TRUE below), in order to be as close as possible
3680 to the state Exim usually runs in. */
3681
3682 if (!unprivileged &&                      /* originally had root AND */
3683     !removed_privilege &&                 /* still got root AND      */
3684     !daemon_listen &&                     /* not starting the daemon */
3685     queue_interval <= 0 &&                /* (either kind of daemon) */
3686       (                                   /*    AND EITHER           */
3687       deliver_drop_privilege ||           /* requested unprivileged  */
3688         (                                 /*       OR                */
3689         queue_interval < 0 &&             /* not running the queue   */
3690         (msg_action_arg < 0 ||            /*       and               */
3691           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3692         (!checking || !address_test_mode) /* not address checking    */
3693         )
3694       ))
3695   {
3696   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3697   }
3698
3699 /* When we are retaining a privileged uid, we still change to the exim gid. */
3700
3701 else setgid(exim_gid);
3702
3703 /* Handle a request to scan a file for malware */
3704 if (malware_test_file)
3705   {
3706 #ifdef WITH_CONTENT_SCAN
3707   int result;
3708   set_process_info("scanning file for malware");
3709   result = malware_in_file(malware_test_file);
3710   if (result == FAIL)
3711     {
3712     printf("No malware found.\n");
3713     exit(EXIT_SUCCESS);
3714     }
3715   if (result != OK)
3716     {
3717     printf("Malware lookup returned non-okay/fail: %d\n", result);
3718     exit(EXIT_FAILURE);
3719     }
3720   if (malware_name)
3721     printf("Malware found: %s\n", malware_name);
3722   else
3723     printf("Malware scan detected malware of unknown name.\n");
3724 #else
3725   printf("Malware scanning not enabled at compile time.\n");
3726 #endif
3727   exit(EXIT_FAILURE);
3728   }
3729
3730 /* Handle a request to list the delivery queue */
3731
3732 if (list_queue)
3733   {
3734   set_process_info("listing the queue");
3735   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3736   exit(EXIT_SUCCESS);
3737   }
3738
3739 /* Handle a request to count the delivery queue */
3740
3741 if (count_queue)
3742   {
3743   set_process_info("counting the queue");
3744   queue_count();
3745   exit(EXIT_SUCCESS);
3746   }
3747
3748 /* Handle actions on specific messages, except for the force delivery and
3749 message load actions, which are done below. Some actions take a whole list of
3750 message ids, which are known to continue up to the end of the arguments. Others
3751 take a single message id and then operate on the recipients list. */
3752
3753 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3754   {
3755   int yield = EXIT_SUCCESS;
3756   set_process_info("acting on specified messages");
3757
3758   if (!one_msg_action)
3759     {
3760     for (i = msg_action_arg; i < argc; i++)
3761       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3762         yield = EXIT_FAILURE;
3763     }
3764
3765   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3766     recipients_arg)) yield = EXIT_FAILURE;
3767   exit(yield);
3768   }
3769
3770 /* All the modes below here require the remaining configuration sections
3771 to be read, except that we can skip over the ACL setting when delivering
3772 specific messages, or doing a queue run. (For various testing cases we could
3773 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3774 for skipping. */
3775
3776 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3777
3778 /* The configuration data will have been read into POOL_PERM because we won't
3779 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3780 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3781 configuration were read into POOL_MAIN, because we don't do any resets till
3782 later on. However, it seems right, and it does ensure that both pools get used.
3783 */
3784
3785 store_pool = POOL_MAIN;
3786
3787 /* Handle the -brt option. This is for checking out retry configurations.
3788 The next three arguments are a domain name or a complete address, and
3789 optionally two error numbers. All it does is to call the function that
3790 scans the retry configuration data. */
3791
3792 if (test_retry_arg >= 0)
3793   {
3794   retry_config *yield;
3795   int basic_errno = 0;
3796   int more_errno = 0;
3797   uschar *s1, *s2;
3798
3799   if (test_retry_arg >= argc)
3800     {
3801     printf("-brt needs a domain or address argument\n");
3802     exim_exit(EXIT_FAILURE);
3803     }
3804   s1 = argv[test_retry_arg++];
3805   s2 = NULL;
3806
3807   /* If the first argument contains no @ and no . it might be a local user
3808   or it might be a single-component name. Treat as a domain. */
3809
3810   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3811     {
3812     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3813       "being \ntreated as a one-component domain, not as a local part.\n\n",
3814       s1);
3815     }
3816
3817   /* There may be an optional second domain arg. */
3818
3819   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3820     s2 = argv[test_retry_arg++];
3821
3822   /* The final arg is an error name */
3823
3824   if (test_retry_arg < argc)
3825     {
3826     uschar *ss = argv[test_retry_arg];
3827     uschar *error =
3828       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3829     if (error != NULL)
3830       {
3831       printf("%s\n", CS error);
3832       return EXIT_FAILURE;
3833       }
3834
3835     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3836     code > 100 as an error is for matching codes to the decade. Turn them into
3837     a real error code, off the decade. */
3838
3839     if (basic_errno == ERRNO_MAIL4XX ||
3840         basic_errno == ERRNO_RCPT4XX ||
3841         basic_errno == ERRNO_DATA4XX)
3842       {
3843       int code = (more_errno >> 8) & 255;
3844       if (code == 255)
3845         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3846       else if (code > 100)
3847         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3848       }
3849     }
3850
3851   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3852   if (yield == NULL) printf("No retry information found\n"); else
3853     {
3854     retry_rule *r;
3855     more_errno = yield->more_errno;
3856     printf("Retry rule: %s  ", yield->pattern);
3857
3858     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3859       {
3860       printf("quota%s%s  ",
3861         (more_errno > 0)? "_" : "",
3862         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3863       }
3864     else if (yield->basic_errno == ECONNREFUSED)
3865       {
3866       printf("refused%s%s  ",
3867         (more_errno > 0)? "_" : "",
3868         (more_errno == 'M')? "MX" :
3869         (more_errno == 'A')? "A" : "");
3870       }
3871     else if (yield->basic_errno == ETIMEDOUT)
3872       {
3873       printf("timeout");
3874       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3875       more_errno &= 255;
3876       if (more_errno != 0) printf("_%s",
3877         (more_errno == 'M')? "MX" : "A");
3878       printf("  ");
3879       }
3880     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3881       printf("auth_failed  ");
3882     else printf("*  ");
3883
3884     for (r = yield->rules; r != NULL; r = r->next)
3885       {
3886       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3887       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3888       if (r->rule == 'G')
3889         {
3890         int x = r->p2;
3891         int f = x % 1000;
3892         int d = 100;
3893         printf(",%d.", x/1000);
3894         do
3895           {
3896           printf("%d", f/d);
3897           f %= d;
3898           d /= 10;
3899           }
3900         while (f != 0);
3901         }
3902       printf("; ");
3903       }
3904
3905     printf("\n");
3906     }
3907   exim_exit(EXIT_SUCCESS);
3908   }
3909
3910 /* Handle a request to list one or more configuration options */
3911
3912 if (list_options)
3913   {
3914   set_process_info("listing variables");
3915   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3916     else for (i = recipients_arg; i < argc; i++)
3917       {
3918       if (i < argc - 1 &&
3919           (Ustrcmp(argv[i], "router") == 0 ||
3920            Ustrcmp(argv[i], "transport") == 0 ||
3921            Ustrcmp(argv[i], "authenticator") == 0 ||
3922            Ustrcmp(argv[i], "macro") == 0))
3923         {
3924         readconf_print(argv[i+1], argv[i]);
3925         i++;
3926         }
3927       else readconf_print(argv[i], NULL);
3928       }
3929   exim_exit(EXIT_SUCCESS);
3930   }
3931
3932
3933 /* Handle a request to deliver one or more messages that are already on the
3934 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3935 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3936
3937 Delivery of specific messages is typically used for a small number when
3938 prodding by hand (when the option forced_delivery will be set) or when
3939 re-execing to regain root privilege. Each message delivery must happen in a
3940 separate process, so we fork a process for each one, and run them sequentially
3941 so that debugging output doesn't get intertwined, and to avoid spawning too
3942 many processes if a long list is given. However, don't fork for the last one;
3943 this saves a process in the common case when Exim is called to deliver just one
3944 message. */
3945
3946 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3947   {
3948   if (prod_requires_admin && !admin_user)
3949     {
3950     fprintf(stderr, "exim: Permission denied\n");
3951     exim_exit(EXIT_FAILURE);
3952     }
3953   set_process_info("delivering specified messages");
3954   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3955   for (i = msg_action_arg; i < argc; i++)
3956     {
3957     int status;
3958     pid_t pid;
3959     if (i == argc - 1)
3960       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3961     else if ((pid = fork()) == 0)
3962       {
3963       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3964       _exit(EXIT_SUCCESS);
3965       }
3966     else if (pid < 0)
3967       {
3968       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3969         strerror(errno));
3970       exim_exit(EXIT_FAILURE);
3971       }
3972     else wait(&status);
3973     }
3974   exim_exit(EXIT_SUCCESS);
3975   }
3976
3977
3978 /* If only a single queue run is requested, without SMTP listening, we can just
3979 turn into a queue runner, with an optional starting message id. */
3980
3981 if (queue_interval == 0 && !daemon_listen)
3982   {
3983   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3984     (start_queue_run_id == NULL)? US"" : US" starting at ",
3985     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3986     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3987     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3988   set_process_info("running the queue (single queue run)");
3989   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3990   exim_exit(EXIT_SUCCESS);
3991   }
3992
3993
3994 /* Find the login name of the real user running this process. This is always
3995 needed when receiving a message, because it is written into the spool file. It
3996 may also be used to construct a from: or a sender: header, and in this case we
3997 need the user's full name as well, so save a copy of it, checked for RFC822
3998 syntax and munged if necessary, if it hasn't previously been set by the -F
3999 argument. We may try to get the passwd entry more than once, in case NIS or
4000 other delays are in evidence. Save the home directory for use in filter testing
4001 (only). */
4002
4003 for (i = 0;;)
4004   {
4005   if ((pw = getpwuid(real_uid)) != NULL)
4006     {
4007     originator_login = string_copy(US pw->pw_name);
4008     originator_home = string_copy(US pw->pw_dir);
4009
4010     /* If user name has not been set by -F, set it from the passwd entry
4011     unless -f has been used to set the sender address by a trusted user. */
4012
4013     if (originator_name == NULL)
4014       {
4015       if (sender_address == NULL ||
4016            (!trusted_caller && filter_test == FTEST_NONE))
4017         {
4018         uschar *name = US pw->pw_gecos;
4019         uschar *amp = Ustrchr(name, '&');
4020         uschar buffer[256];
4021
4022         /* Most Unix specify that a '&' character in the gecos field is
4023         replaced by a copy of the login name, and some even specify that
4024         the first character should be upper cased, so that's what we do. */
4025
4026         if (amp != NULL)
4027           {
4028           int loffset;
4029           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4030             amp - name, name, &loffset, originator_login, amp + 1);
4031           buffer[loffset] = toupper(buffer[loffset]);
4032           name = buffer;
4033           }
4034
4035         /* If a pattern for matching the gecos field was supplied, apply
4036         it and then expand the name string. */
4037
4038         if (gecos_pattern != NULL && gecos_name != NULL)
4039           {
4040           const pcre *re;
4041           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4042
4043           if (regex_match_and_setup(re, name, 0, -1))
4044             {
4045             uschar *new_name = expand_string(gecos_name);
4046             expand_nmax = -1;
4047             if (new_name != NULL)
4048               {
4049               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4050                 "gecos field \"%s\"\n", new_name, name);
4051               name = new_name;
4052               }
4053             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4054               "\"%s\": %s\n", gecos_name, expand_string_message);
4055             }
4056           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4057             "gecos field \"%s\"\n", gecos_pattern, name);
4058           store_free((void *)re);
4059           }
4060         originator_name = string_copy(name);
4061         }
4062
4063       /* A trusted caller has used -f but not -F */
4064
4065       else originator_name = US"";
4066       }
4067
4068     /* Break the retry loop */
4069
4070     break;
4071     }
4072
4073   if (++i > finduser_retries) break;
4074   sleep(1);
4075   }
4076
4077 /* If we cannot get a user login, log the incident and give up, unless the
4078 configuration specifies something to use. When running in the test harness,
4079 any setting of unknown_login overrides the actual name. */
4080
4081 if (originator_login == NULL || running_in_test_harness)
4082   {
4083   if (unknown_login != NULL)
4084     {
4085     originator_login = expand_string(unknown_login);
4086     if (originator_name == NULL && unknown_username != NULL)
4087       originator_name = expand_string(unknown_username);
4088     if (originator_name == NULL) originator_name = US"";
4089     }
4090   if (originator_login == NULL)
4091     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4092       (int)real_uid);
4093   }
4094
4095 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4096 RFC822 address.*/
4097
4098 originator_name = string_copy(parse_fix_phrase(originator_name,
4099   Ustrlen(originator_name), big_buffer, big_buffer_size));
4100
4101 /* If a message is created by this call of Exim, the uid/gid of its originator
4102 are those of the caller. These values are overridden if an existing message is
4103 read in from the spool. */
4104
4105 originator_uid = real_uid;
4106 originator_gid = real_gid;
4107
4108 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4109   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4110
4111 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4112 returns. We leave this till here so that the originator_ fields are available
4113 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4114 mode. */
4115
4116 if (daemon_listen || queue_interval > 0)
4117   {
4118   if (mua_wrapper)
4119     {
4120     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4121     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4122       "mua_wrapper is set");
4123     }
4124   daemon_go();
4125   }
4126
4127 /* If the sender ident has not been set (by a trusted caller) set it to
4128 the caller. This will get overwritten below for an inetd call. If a trusted
4129 caller has set it empty, unset it. */
4130
4131 if (sender_ident == NULL) sender_ident = originator_login;
4132   else if (sender_ident[0] == 0) sender_ident = NULL;
4133
4134 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4135 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4136 originator_* variables set. */
4137
4138 if (test_rewrite_arg >= 0)
4139   {
4140   really_exim = FALSE;
4141   if (test_rewrite_arg >= argc)
4142     {
4143     printf("-brw needs an address argument\n");
4144     exim_exit(EXIT_FAILURE);
4145     }
4146   rewrite_test(argv[test_rewrite_arg]);
4147   exim_exit(EXIT_SUCCESS);
4148   }
4149
4150 /* A locally-supplied message is considered to be coming from a local user
4151 unless a trusted caller supplies a sender address with -f, or is passing in the
4152 message via SMTP (inetd invocation or otherwise). */
4153
4154 if ((sender_address == NULL && !smtp_input) ||
4155     (!trusted_caller && filter_test == FTEST_NONE))
4156   {
4157   sender_local = TRUE;
4158
4159   /* A trusted caller can supply authenticated_sender and authenticated_id
4160   via -oMas and -oMai and if so, they will already be set. Otherwise, force
4161   defaults except when host checking. */
4162
4163   if (authenticated_sender == NULL && !host_checking)
4164     authenticated_sender = string_sprintf("%s@%s", originator_login,
4165       qualify_domain_sender);
4166   if (authenticated_id == NULL && !host_checking)
4167     authenticated_id = originator_login;
4168   }
4169
4170 /* Trusted callers are always permitted to specify the sender address.
4171 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4172 is specified is the empty address. However, if a trusted caller does not
4173 specify a sender address for SMTP input, we leave sender_address unset. This
4174 causes the MAIL commands to be honoured. */
4175
4176 if ((!smtp_input && sender_address == NULL) ||
4177     !receive_check_set_sender(sender_address))
4178   {
4179   /* Either the caller is not permitted to set a general sender, or this is
4180   non-SMTP input and the trusted caller has not set a sender. If there is no
4181   sender, or if a sender other than <> is set, override with the originator's
4182   login (which will get qualified below), except when checking things. */
4183
4184   if (sender_address == NULL             /* No sender_address set */
4185        ||                                /*         OR            */
4186        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4187        !checking &&                      /* Not running tests, AND */
4188        filter_test == FTEST_NONE))       /* Not testing a filter */
4189     {
4190     sender_address = originator_login;
4191     sender_address_forced = FALSE;
4192     sender_address_domain = 0;
4193     }
4194   }
4195
4196 /* Remember whether an untrusted caller set the sender address */
4197
4198 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4199
4200 /* Ensure that the sender address is fully qualified unless it is the empty
4201 address, which indicates an error message, or doesn't exist (root caller, smtp
4202 interface, no -f argument). */
4203
4204 if (sender_address != NULL && sender_address[0] != 0 &&
4205     sender_address_domain == 0)
4206   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4207     qualify_domain_sender);
4208
4209 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4210
4211 /* Handle a request to verify a list of addresses, or test them for delivery.
4212 This must follow the setting of the sender address, since routers can be
4213 predicated upon the sender. If no arguments are given, read addresses from
4214 stdin. Set debug_level to at least D_v to get full output for address testing.
4215 */
4216
4217 if (verify_address_mode || address_test_mode)
4218   {
4219   int exit_value = 0;
4220   int flags = vopt_qualify;
4221
4222   if (verify_address_mode)
4223     {
4224     if (!verify_as_sender) flags |= vopt_is_recipient;
4225     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4226     }
4227
4228   else
4229     {
4230     flags |= vopt_is_recipient;
4231     debug_selector |= D_v;
4232     debug_file = stderr;
4233     debug_fd = fileno(debug_file);
4234     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4235     }
4236
4237   if (recipients_arg < argc)
4238     {
4239     while (recipients_arg < argc)
4240       {
4241       uschar *s = argv[recipients_arg++];
4242       while (*s != 0)
4243         {
4244         BOOL finished = FALSE;
4245         uschar *ss = parse_find_address_end(s, FALSE);
4246         if (*ss == ',') *ss = 0; else finished = TRUE;
4247         test_address(s, flags, &exit_value);
4248         s = ss;
4249         if (!finished)
4250           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4251         }
4252       }
4253     }
4254
4255   else for (;;)
4256     {
4257     uschar *s = get_stdinput(NULL, NULL);
4258     if (s == NULL) break;
4259     test_address(s, flags, &exit_value);
4260     }
4261
4262   route_tidyup();
4263   exim_exit(exit_value);
4264   }
4265
4266 /* Handle expansion checking. Either expand items on the command line, or read
4267 from stdin if there aren't any. If -Mset was specified, load the message so
4268 that its variables can be used, but restrict this facility to admin users.
4269 Otherwise, if -bem was used, read a message from stdin. */
4270
4271 if (expansion_test)
4272   {
4273   if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4274     {
4275     uschar spoolname[256];  /* Not big_buffer; used in spool_read_header() */
4276     if (!admin_user)
4277       {
4278       fprintf(stderr, "exim: permission denied\n");
4279       exit(EXIT_FAILURE);
4280       }
4281     message_id = argv[msg_action_arg];
4282     (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4283     if (!spool_open_datafile(message_id))
4284       printf ("Failed to load message datafile %s\n", message_id);
4285     if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4286       printf ("Failed to load message %s\n", message_id);
4287     }
4288
4289   /* Read a test message from a file. We fudge it up to be on stdin, saving
4290   stdin itself for later reading of expansion strings. */
4291
4292   else if (expansion_test_message != NULL)
4293     {
4294     int save_stdin = dup(0);
4295     int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4296     if (fd < 0)
4297       {
4298       fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4299         strerror(errno));
4300       return EXIT_FAILURE;
4301       }
4302     (void) dup2(fd, 0);
4303     filter_test = FTEST_USER;      /* Fudge to make it look like filter test */
4304     message_ended = END_NOTENDED;
4305     read_message_body(receive_msg(extract_recipients));
4306     message_linecount += body_linecount;
4307     (void)dup2(save_stdin, 0);
4308     (void)close(save_stdin);
4309     clearerr(stdin);               /* Required by Darwin */
4310     }
4311
4312   /* Allow $recipients for this testing */
4313
4314   enable_dollar_recipients = TRUE;
4315
4316   /* Expand command line items */
4317
4318   if (recipients_arg < argc)
4319     {
4320     while (recipients_arg < argc)
4321       {
4322       uschar *s = argv[recipients_arg++];
4323       uschar *ss = expand_string(s);
4324       if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4325       else printf("%s\n", CS ss);
4326       }
4327     }
4328
4329   /* Read stdin */
4330
4331   else
4332     {
4333     char *(*fn_readline)(char *) = NULL;
4334     char *(*fn_addhist)(char *) = NULL;
4335
4336     #ifdef USE_READLINE
4337     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4338     #endif
4339
4340     for (;;)
4341       {
4342       uschar *ss;
4343       uschar *source = get_stdinput(fn_readline, fn_addhist);
4344       if (source == NULL) break;
4345       ss = expand_string(source);
4346       if (ss == NULL)
4347         printf ("Failed: %s\n", expand_string_message);
4348       else printf("%s\n", CS ss);
4349       }
4350
4351     #ifdef USE_READLINE
4352     if (dlhandle != NULL) dlclose(dlhandle);
4353     #endif
4354     }
4355
4356   /* The data file will be open after -Mset */
4357
4358   if (deliver_datafile >= 0)
4359     {
4360     (void)close(deliver_datafile);
4361     deliver_datafile = -1;
4362     }
4363
4364   exim_exit(EXIT_SUCCESS);
4365   }
4366
4367
4368 /* The active host name is normally the primary host name, but it can be varied
4369 for hosts that want to play several parts at once. We need to ensure that it is
4370 set for host checking, and for receiving messages. */
4371
4372 smtp_active_hostname = primary_hostname;
4373 if (raw_active_hostname != NULL)
4374   {
4375   uschar *nah = expand_string(raw_active_hostname);
4376   if (nah == NULL)
4377     {
4378     if (!expand_string_forcedfail)
4379       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4380         "(smtp_active_hostname): %s", raw_active_hostname,
4381         expand_string_message);
4382     }
4383   else if (nah[0] != 0) smtp_active_hostname = nah;
4384   }
4385
4386 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4387 given IP address so that the blocking and relay configuration can be tested.
4388 Unless a sender_ident was set by -oMt, we discard it (the default is the
4389 caller's login name). An RFC 1413 call is made only if we are running in the
4390 test harness and an incoming interface and both ports are specified, because
4391 there is no TCP/IP call to find the ident for. */
4392
4393 if (host_checking)
4394   {
4395   int x[4];
4396   int size;
4397
4398   if (!sender_ident_set)
4399     {
4400     sender_ident = NULL;
4401     if (running_in_test_harness && sender_host_port != 0 &&
4402         interface_address != NULL && interface_port != 0)
4403       verify_get_ident(1413);
4404     }
4405
4406   /* In case the given address is a non-canonical IPv6 address, canonicize
4407   it. The code works for both IPv4 and IPv6, as it happens. */
4408
4409   size = host_aton(sender_host_address, x);
4410   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4411   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4412
4413   /* Now set up for testing */
4414
4415   host_build_sender_fullhost();
4416   smtp_input = TRUE;
4417   smtp_in = stdin;
4418   smtp_out = stdout;
4419   sender_local = FALSE;
4420   sender_host_notsocket = TRUE;
4421   debug_file = stderr;
4422   debug_fd = fileno(debug_file);
4423   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4424     "**** but without any ident (RFC 1413) callback.\n"
4425     "**** This is not for real!\n\n",
4426       sender_host_address);
4427
4428   if (verify_check_host(&hosts_connection_nolog) == OK)
4429     log_write_selector &= ~L_smtp_connection;
4430   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4431
4432   /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4433   because a log line has already been written for all its failure exists
4434   (usually "connection refused: <reason>") and writing another one is
4435   unnecessary clutter. */
4436
4437   if (smtp_start_session())
4438     {
4439     reset_point = store_get(0);
4440     for (;;)
4441       {
4442       store_reset(reset_point);
4443       if (smtp_setup_msg() <= 0) break;
4444       if (!receive_msg(FALSE)) break;
4445       }
4446     smtp_log_no_mail();
4447     }
4448   exim_exit(EXIT_SUCCESS);
4449   }
4450
4451
4452 /* Arrange for message reception if recipients or SMTP were specified;
4453 otherwise complain unless a version print (-bV) happened or this is a filter
4454 verification test. In the former case, show the configuration file name. */
4455
4456 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4457   {
4458   if (version_printed)
4459     {
4460     printf("Configuration file is %s\n", config_main_filename);
4461     return EXIT_SUCCESS;
4462     }
4463
4464   if (filter_test == FTEST_NONE)
4465     exim_usage(called_as);
4466   }
4467
4468
4469 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4470 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4471 that we are not called from inetd, because that is rejected above. The
4472 following configuration settings are forced here:
4473
4474   (1) Synchronous delivery (-odi)
4475   (2) Errors to stderr (-oep == -oeq)
4476   (3) No parallel remote delivery
4477   (4) Unprivileged delivery
4478
4479 We don't force overall queueing options because there are several of them;
4480 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4481 to override any SMTP queueing. */
4482
4483 if (mua_wrapper)
4484   {
4485   synchronous_delivery = TRUE;
4486   arg_error_handling = ERRORS_STDERR;
4487   remote_max_parallel = 1;
4488   deliver_drop_privilege = TRUE;
4489   queue_smtp = FALSE;
4490   queue_smtp_domains = NULL;
4491   }
4492
4493
4494 /* Prepare to accept one or more new messages on the standard input. When a
4495 message has been read, its id is returned in message_id[]. If doing immediate
4496 delivery, we fork a delivery process for each received message, except for the
4497 last one, where we can save a process switch.
4498
4499 It is only in non-smtp mode that error_handling is allowed to be changed from
4500 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4501 sendmail error modes other than -oem ever actually used? Later: yes.) */
4502
4503 if (!smtp_input) error_handling = arg_error_handling;
4504
4505 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4506 logging being sent down the socket and make an identd call to get the
4507 sender_ident. */
4508
4509 else if (is_inetd)
4510   {
4511   (void)fclose(stderr);
4512   exim_nullstd();                       /* Re-open to /dev/null */
4513   verify_get_ident(IDENT_PORT);
4514   host_build_sender_fullhost();
4515   set_process_info("handling incoming connection from %s via inetd",
4516     sender_fullhost);
4517   }
4518
4519 /* If the sender host address has been set, build sender_fullhost if it hasn't
4520 already been done (which it will have been for inetd). This caters for the
4521 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4522 so that the test for IP options is skipped for -bs input. */
4523
4524 if (sender_host_address != NULL && sender_fullhost == NULL)
4525   {
4526   host_build_sender_fullhost();
4527   set_process_info("handling incoming connection from %s via -oMa",
4528     sender_fullhost);
4529   sender_host_notsocket = TRUE;
4530   }
4531
4532 /* Otherwise, set the sender host as unknown except for inetd calls. This
4533 prevents host checking in the case of -bs not from inetd and also for -bS. */
4534
4535 else if (!is_inetd) sender_host_unknown = TRUE;
4536
4537 /* If stdout does not exist, then dup stdin to stdout. This can happen
4538 if exim is started from inetd. In this case fd 0 will be set to the socket,
4539 but fd 1 will not be set. This also happens for passed SMTP channels. */
4540
4541 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4542
4543 /* Set up the incoming protocol name and the state of the program. Root is
4544 allowed to force received protocol via the -oMr option above. If we have come
4545 via inetd, the process info has already been set up. We don't set
4546 received_protocol here for smtp input, as it varies according to
4547 batch/HELO/EHLO/AUTH/TLS. */
4548
4549 if (smtp_input)
4550   {
4551   if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4552     smtp_batched_input? "batched " : "",
4553     (sender_address!= NULL)? sender_address : originator_login);
4554   }
4555 else
4556   {
4557   if (received_protocol == NULL)
4558     received_protocol = string_sprintf("local%s", called_as);
4559   set_process_info("accepting a local non-SMTP message from <%s>",
4560     sender_address);
4561   }
4562
4563 /* Initialize the session_local_queue-only flag (this will be ignored if
4564 mua_wrapper is set) */
4565
4566 queue_check_only();
4567 session_local_queue_only = queue_only;
4568
4569 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4570 the spool if so configured. On failure, we must not attempt to send an error
4571 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4572 error code is given.) */
4573
4574 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4575   {
4576   fprintf(stderr, "exim: insufficient disk space\n");
4577   return EXIT_FAILURE;
4578   }
4579
4580 /* If this is smtp input of any kind, real or batched, handle the start of the
4581 SMTP session.
4582
4583 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4584 because a log line has already been written for all its failure exists
4585 (usually "connection refused: <reason>") and writing another one is
4586 unnecessary clutter. */
4587
4588 if (smtp_input)
4589   {
4590   smtp_in = stdin;
4591   smtp_out = stdout;
4592   if (verify_check_host(&hosts_connection_nolog) == OK)
4593     log_write_selector &= ~L_smtp_connection;
4594   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4595   if (!smtp_start_session())
4596     {
4597     mac_smtp_fflush();
4598     exim_exit(EXIT_SUCCESS);
4599     }
4600   }
4601
4602 /* Otherwise, set up the input size limit here. */
4603
4604 else
4605   {
4606   thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4607   if (expand_string_message != NULL)
4608     {
4609     if (thismessage_size_limit == -1)
4610       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4611         "message_size_limit: %s", expand_string_message);
4612     else
4613       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4614         "message_size_limit: %s", expand_string_message);
4615     }
4616   }
4617
4618 /* Loop for several messages when reading SMTP input. If we fork any child
4619 processes, we don't want to wait for them unless synchronous delivery is
4620 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4621 same as SIG_DFL, despite the fact that documentation often lists the default as
4622 "ignore". This is a confusing area. This is what I know:
4623
4624 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4625 processes that complete simply to go away without ever becoming defunct. You
4626 can't then wait for them - but we don't want to wait for them in the
4627 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4628 happen for all OS (e.g. *BSD is different).
4629
4630 But that's not the end of the story. Some (many? all?) systems have the
4631 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4632 has by default, so it seems that the difference is merely one of default
4633 (compare restarting vs non-restarting signals).
4634
4635 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4636 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4637 of the loop below. Paranoia rules.
4638
4639 February 2003: That's *still* not the end of the story. There are now versions
4640 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4641 process then calls waitpid(), a grumble is written to the system log, because
4642 this is logically inconsistent. In other words, it doesn't like the paranoia.
4643 As a consequenc of this, the waitpid() below is now excluded if we are sure
4644 that SIG_IGN works. */
4645
4646 if (!synchronous_delivery)
4647   {
4648   #ifdef SA_NOCLDWAIT
4649   struct sigaction act;
4650   act.sa_handler = SIG_IGN;
4651   sigemptyset(&(act.sa_mask));
4652   act.sa_flags = SA_NOCLDWAIT;
4653   sigaction(SIGCHLD, &act, NULL);
4654   #else
4655   signal(SIGCHLD, SIG_IGN);
4656   #endif
4657   }
4658
4659 /* Save the current store pool point, for resetting at the start of
4660 each message, and save the real sender address, if any. */
4661
4662 reset_point = store_get(0);
4663 real_sender_address = sender_address;
4664
4665 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4666 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4667 collapsed). */
4668
4669 while (more)
4670   {
4671   store_reset(reset_point);
4672   message_id[0] = 0;
4673
4674   /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4675   input and build the recipients list, before calling receive_msg() to read the
4676   message proper. Whatever sender address is given in the SMTP transaction is
4677   often ignored for local senders - we use the actual sender, which is normally
4678   either the underlying user running this process or a -f argument provided by
4679   a trusted caller. It is saved in real_sender_address. The test for whether to
4680   accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4681
4682   if (smtp_input)
4683     {
4684     int rc;
4685     if ((rc = smtp_setup_msg()) > 0)
4686       {
4687       if (real_sender_address != NULL &&
4688           !receive_check_set_sender(sender_address))
4689         {
4690         sender_address = raw_sender = real_sender_address;
4691         sender_address_unrewritten = NULL;
4692         }
4693
4694       /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4695       isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4696       the very end. The result of the ACL is ignored (as for other non-SMTP
4697       messages). It is run for its potential side effects. */
4698
4699       if (smtp_batched_input && acl_not_smtp_start != NULL)
4700         {
4701         uschar *user_msg, *log_msg;
4702         enable_dollar_recipients = TRUE;
4703         (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4704           &user_msg, &log_msg);
4705         enable_dollar_recipients = FALSE;
4706         }
4707
4708       /* Now get the data for the message */
4709
4710       more = receive_msg(extract_recipients);
4711       if (message_id[0] == 0)
4712         {
4713         if (more) continue;
4714         smtp_log_no_mail();               /* Log no mail if configured */
4715         exim_exit(EXIT_FAILURE);
4716         }
4717       }
4718     else
4719       {
4720       smtp_log_no_mail();               /* Log no mail if configured */
4721       exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4722       }
4723     }
4724
4725   /* In the non-SMTP case, we have all the information from the command
4726   line, but must process it in case it is in the more general RFC822
4727   format, and in any case, to detect syntax errors. Also, it appears that
4728   the use of comma-separated lists as single arguments is common, so we
4729   had better support them. */
4730
4731   else
4732     {
4733     int i;
4734     int rcount = 0;
4735     int count = argc - recipients_arg;
4736     uschar **list = argv + recipients_arg;
4737
4738     /* These options cannot be changed dynamically for non-SMTP messages */
4739
4740     active_local_sender_retain = local_sender_retain;
4741     active_local_from_check = local_from_check;
4742
4743     /* Save before any rewriting */
4744
4745     raw_sender = string_copy(sender_address);
4746
4747     /* Loop for each argument */
4748
4749     for (i = 0; i < count; i++)
4750       {
4751       int start, end, domain;
4752       uschar *errmess;
4753       uschar *s = list[i];
4754
4755       /* Loop for each comma-separated address */
4756
4757       while (*s != 0)
4758         {
4759         BOOL finished = FALSE;
4760         uschar *recipient;
4761         uschar *ss = parse_find_address_end(s, FALSE);
4762
4763         if (*ss == ',') *ss = 0; else finished = TRUE;
4764
4765         /* Check max recipients - if -t was used, these aren't recipients */
4766
4767         if (recipients_max > 0 && ++rcount > recipients_max &&
4768             !extract_recipients)
4769           {
4770           if (error_handling == ERRORS_STDERR)
4771             {
4772             fprintf(stderr, "exim: too many recipients\n");
4773             exim_exit(EXIT_FAILURE);
4774             }
4775           else
4776             {
4777             return
4778               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4779                 errors_sender_rc : EXIT_FAILURE;
4780             }
4781           }
4782
4783         recipient =
4784           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4785
4786         if (domain == 0 && !allow_unqualified_recipient)
4787           {
4788           recipient = NULL;
4789           errmess = US"unqualified recipient address not allowed";
4790           }
4791
4792         if (recipient == NULL)
4793           {
4794           if (error_handling == ERRORS_STDERR)
4795             {
4796             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4797               string_printing(list[i]), errmess);
4798             exim_exit(EXIT_FAILURE);
4799             }
4800           else
4801             {
4802             error_block eblock;
4803             eblock.next = NULL;
4804             eblock.text1 = string_printing(list[i]);
4805             eblock.text2 = errmess;
4806             return
4807               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4808                 errors_sender_rc : EXIT_FAILURE;
4809             }
4810           }
4811
4812         receive_add_recipient(recipient, -1);
4813         s = ss;
4814         if (!finished)
4815           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4816         }
4817       }
4818
4819     /* Show the recipients when debugging */
4820
4821     DEBUG(D_receive)
4822       {
4823       int i;
4824       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4825       if (recipients_list != NULL)
4826         {
4827         debug_printf("Recipients:\n");
4828         for (i = 0; i < recipients_count; i++)
4829           debug_printf("  %s\n", recipients_list[i].address);
4830         }
4831       }
4832
4833     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4834     ignored; rejecting here would just add complication, and it can just as
4835     well be done later. Allow $recipients to be visible in the ACL. */
4836
4837     if (acl_not_smtp_start != NULL)
4838       {
4839       uschar *user_msg, *log_msg;
4840       enable_dollar_recipients = TRUE;
4841       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4842         &user_msg, &log_msg);
4843       enable_dollar_recipients = FALSE;
4844       }
4845
4846     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4847     will just read the headers for the message, and not write anything onto the
4848     spool. */
4849
4850     message_ended = END_NOTENDED;
4851     more = receive_msg(extract_recipients);
4852
4853     /* more is always FALSE here (not SMTP message) when reading a message
4854     for real; when reading the headers of a message for filter testing,
4855     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4856
4857     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4858     }  /* Non-SMTP message reception */
4859
4860   /* If this is a filter testing run, there are headers in store, but
4861   no message on the spool. Run the filtering code in testing mode, setting
4862   the domain to the qualify domain and the local part to the current user,
4863   unless they have been set by options. The prefix and suffix are left unset
4864   unless specified. The the return path is set to to the sender unless it has
4865   already been set from a return-path header in the message. */
4866
4867   if (filter_test != FTEST_NONE)
4868     {
4869     deliver_domain = (ftest_domain != NULL)?
4870       ftest_domain : qualify_domain_recipient;
4871     deliver_domain_orig = deliver_domain;
4872     deliver_localpart = (ftest_localpart != NULL)?
4873       ftest_localpart : originator_login;
4874     deliver_localpart_orig = deliver_localpart;
4875     deliver_localpart_prefix = ftest_prefix;
4876     deliver_localpart_suffix = ftest_suffix;
4877     deliver_home = originator_home;
4878
4879     if (return_path == NULL)
4880       {
4881       printf("Return-path copied from sender\n");
4882       return_path = string_copy(sender_address);
4883       }
4884     else
4885       {
4886       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4887       }
4888     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4889
4890     receive_add_recipient(
4891       string_sprintf("%s%s%s@%s",
4892         (ftest_prefix == NULL)? US"" : ftest_prefix,
4893         deliver_localpart,
4894         (ftest_suffix == NULL)? US"" : ftest_suffix,
4895         deliver_domain), -1);
4896
4897     printf("Recipient   = %s\n", recipients_list[0].address);
4898     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4899     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4900
4901     (void)chdir("/");   /* Get away from wherever the user is running this from */
4902
4903     /* Now we run either a system filter test, or a user filter test, or both.
4904     In the latter case, headers added by the system filter will persist and be
4905     available to the user filter. We need to copy the filter variables
4906     explicitly. */
4907
4908     if ((filter_test & FTEST_SYSTEM) != 0)
4909       {
4910       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4911         exim_exit(EXIT_FAILURE);
4912       }
4913
4914     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4915
4916     if ((filter_test & FTEST_USER) != 0)
4917       {
4918       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4919         exim_exit(EXIT_FAILURE);
4920       }
4921
4922     exim_exit(EXIT_SUCCESS);
4923     }
4924
4925   /* Else act on the result of message reception. We should not get here unless
4926   message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4927   will be TRUE. If it is not, check on the number of messages received in this
4928   connection. */
4929
4930   if (!session_local_queue_only &&
4931       smtp_accept_queue_per_connection > 0 &&
4932       receive_messagecount > smtp_accept_queue_per_connection)
4933     {
4934     session_local_queue_only = TRUE;
4935     queue_only_reason = 2;
4936     }
4937
4938   /* Initialize local_queue_only from session_local_queue_only. If it is false,
4939   and queue_only_load is set, check that the load average is below it. If it is
4940   not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4941   default), we put the whole session into queue_only mode. It then remains this
4942   way for any subsequent messages on the same SMTP connection. This is a
4943   deliberate choice; even though the load average may fall, it doesn't seem
4944   right to deliver later messages on the same call when not delivering earlier
4945   ones. However, there are odd cases where this is not wanted, so this can be
4946   changed by setting queue_only_load_latch false. */
4947
4948   local_queue_only = session_local_queue_only;
4949   if (!local_queue_only && queue_only_load >= 0)
4950     {
4951     local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4952     if (local_queue_only)
4953       {
4954       queue_only_reason = 3;
4955       if (queue_only_load_latch) session_local_queue_only = TRUE;
4956       }
4957     }
4958
4959   /* If running as an MUA wrapper, all queueing options and freezing options
4960   are ignored. */
4961
4962   if (mua_wrapper)
4963     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4964
4965   /* Log the queueing here, when it will get a message id attached, but
4966   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4967   connections). */
4968
4969   if (local_queue_only) switch(queue_only_reason)
4970     {
4971     case 2:
4972     log_write(L_delay_delivery,
4973               LOG_MAIN, "no immediate delivery: more than %d messages "
4974       "received in one connection", smtp_accept_queue_per_connection);
4975     break;
4976
4977     case 3:
4978     log_write(L_delay_delivery,
4979               LOG_MAIN, "no immediate delivery: load average %.2f",
4980               (double)load_average/1000.0);
4981     break;
4982     }
4983
4984   /* Else do the delivery unless the ACL or local_scan() called for queue only
4985   or froze the message. Always deliver in a separate process. A fork failure is
4986   not a disaster, as the delivery will eventually happen on a subsequent queue
4987   run. The search cache must be tidied before the fork, as the parent will
4988   do it before exiting. The child will trigger a lookup failure and
4989   thereby defer the delivery if it tries to use (for example) a cached ldap
4990   connection that the parent has called unbind on. */
4991
4992   else if (!queue_only_policy && !deliver_freeze)
4993     {
4994     pid_t pid;
4995     search_tidyup();
4996
4997     if ((pid = fork()) == 0)
4998       {
4999       int rc;
5000       close_unwanted();      /* Close unwanted file descriptors and TLS */
5001       exim_nullstd();        /* Ensure std{in,out,err} exist */
5002
5003       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5004       mode, deliver_drop_privilege is forced TRUE). */
5005
5006       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5007         {
5008         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5009           message_id);
5010         /* Control does not return here. */
5011         }
5012
5013       /* No need to re-exec */
5014
5015       rc = deliver_message(message_id, FALSE, FALSE);
5016       search_tidyup();
5017       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5018         EXIT_SUCCESS : EXIT_FAILURE);
5019       }
5020
5021     if (pid < 0)
5022       {
5023       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5024         "process: %s", strerror(errno));
5025       }
5026
5027     /* In the parent, wait if synchronous delivery is required. This will
5028     always be the case in MUA wrapper mode. */
5029
5030     else if (synchronous_delivery)
5031       {
5032       int status;
5033       while (wait(&status) != pid);
5034       if ((status & 0x00ff) != 0)
5035         log_write(0, LOG_MAIN|LOG_PANIC,
5036           "process %d crashed with signal %d while delivering %s",
5037           (int)pid, status & 0x00ff, message_id);
5038       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5039       }
5040     }
5041
5042   /* The loop will repeat if more is TRUE. If we do not know know that the OS
5043   automatically reaps children (see comments above the loop), clear away any
5044   finished subprocesses here, in case there are lots of messages coming in
5045   from the same source. */
5046
5047   #ifndef SIG_IGN_WORKS
5048   while (waitpid(-1, NULL, WNOHANG) > 0);
5049   #endif
5050   }
5051
5052 exim_exit(EXIT_SUCCESS);   /* Never returns */
5053 return 0;                  /* To stop compiler warning */
5054 }
5055
5056 /* End of exim.c */