src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.33 2006/02/16 10:05:33 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17
  18
  19 /*************************************************
  20 *      Function interface to store functions     *
  21 *************************************************/
  22
  23 /* We need some real functions to pass to the PCRE regular expression library
  24 for store allocation via Exim's store manager. The normal calls are actually
  25 macros that pass over location information to make tracing easier. These
  26 functions just interface to the standard macro calls. A good compiler will
  27 optimize out the tail recursion and so not make them too expensive. There
  28 are two sets of functions; one for use when we want to retain the compiled
  29 regular expression for a long time; the other for short-term use. */
  30
  31 static void *
  32 function_store_get(size_t size)
  33 {
  34 return store_get((int)size);
  35 }
  36
  37 static void
  38 function_dummy_free(void *block) { block = block; }
  39
  40 static void *
  41 function_store_malloc(size_t size)
  42 {
  43 return store_malloc((int)size);
  44 }
  45
  46 static void
  47 function_store_free(void *block)
  48 {
  49 store_free(block);
  50 }
  51
  52
  53
  54
  55 /*************************************************
  56 *  Compile regular expression and panic on fail  *
  57 *************************************************/
  58
  59 /* This function is called when failure to compile a regular expression leads
  60 to a panic exit. In other cases, pcre_compile() is called directly. In many
  61 cases where this function is used, the results of the compilation are to be
  62 placed in long-lived store, so we temporarily reset the store management
  63 functions that PCRE uses if the use_malloc flag is set.
  64
  65 Argument:
  66   pattern     the pattern to compile
  67   caseless    TRUE if caseless matching is required
  68   use_malloc  TRUE if compile into malloc store
  69
  70 Returns:      pointer to the compiled pattern
  71 */
  72
  73 const pcre *
  74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  75 {
  76 int offset;
  77 int options = PCRE_COPT;
  78 const pcre *yield;
  79 const uschar *error;
  80 if (use_malloc)
  81   {
  82   pcre_malloc = function_store_malloc;
  83   pcre_free = function_store_free;
  84   }
  85 if (caseless) options |= PCRE_CASELESS;
  86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  87 pcre_malloc = function_store_get;
  88 pcre_free = function_dummy_free;
  89 if (yield == NULL)
  90   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  91     "%s at offset %d while compiling %s", error, offset, pattern);
  92 return yield;
  93 }
  94
  95
  96
  97
  98 /*************************************************
  99 *   Execute regular expression and set strings   *
 100 *************************************************/
 101
 102 /* This function runs a regular expression match, and sets up the pointers to
 103 the matched substrings.
 104
 105 Arguments:
 106   re          the compiled expression
 107   subject     the subject string
 108   options     additional PCRE options
 109   setup       if < 0 do full setup
 110               if >= 0 setup from setup+1 onwards,
 111                 excluding the full matched string
 112
 113 Returns:      TRUE or FALSE
 114 */
 115
 116 BOOL
 117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 118 {
 119 int ovector[3*(EXPAND_MAXN+1)];
 120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 121   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 122 BOOL yield = n >= 0;
 123 if (n == 0) n = EXPAND_MAXN + 1;
 124 if (yield)
 125   {
 126   int nn;
 127   expand_nmax = (setup < 0)? 0 : setup + 1;
 128   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 129     {
 130     expand_nstring[expand_nmax] = subject + ovector[nn];
 131     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 132     }
 133   expand_nmax--;
 134   }
 135 return yield;
 136 }
 137
 138
 139
 140
 141 /*************************************************
 142 *             Handler for SIGUSR1                *
 143 *************************************************/
 144
 145 /* SIGUSR1 causes any exim process to write to the process log details of
 146 what it is currently doing. It will only be used if the OS is capable of
 147 setting up a handler that causes automatic restarting of any system call
 148 that is in progress at the time.
 149
 150 Argument: the signal number (SIGUSR1)
 151 Returns:  nothing
 152 */
 153
 154 static void
 155 usr1_handler(int sig)
 156 {
 157 sig = sig;      /* Keep picky compilers happy */
 158 log_write(0, LOG_PROCESS, "%s", process_info);
 159 log_close_all();
 160 os_restarting_signal(SIGUSR1, usr1_handler);
 161 }
 162
 163
 164
 165 /*************************************************
 166 *             Timeout handler                    *
 167 *************************************************/
 168
 169 /* This handler is enabled most of the time that Exim is running. The handler
 170 doesn't actually get used unless alarm() has been called to set a timer, to
 171 place a time limit on a system call of some kind. When the handler is run, it
 172 re-enables itself.
 173
 174 There are some other SIGALRM handlers that are used in special cases when more
 175 than just a flag setting is required; for example, when reading a message's
 176 input. These are normally set up in the code module that uses them, and the
 177 SIGALRM handler is reset to this one afterwards.
 178
 179 Argument: the signal value (SIGALRM)
 180 Returns:  nothing
 181 */
 182
 183 void
 184 sigalrm_handler(int sig)
 185 {
 186 sig = sig;      /* Keep picky compilers happy */
 187 sigalrm_seen = TRUE;
 188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 189 }
 190
 191
 192
 193 /*************************************************
 194 *      Sleep for a fractional time interval      *
 195 *************************************************/
 196
 197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 198 period of time that may include a fraction of a second. The coding is somewhat
 199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 200 will wait for ever, so we panic in this instance. (There was a case of this
 201 when a bug in a function that calls milliwait() caused it to pass invalid data.
 202 That's when I added the check. :-)
 203
 204 Argument:  an itimerval structure containing the interval
 205 Returns:   nothing
 206 */
 207
 208 static void
 209 milliwait(struct itimerval *itval)
 210 {
 211 sigset_t sigmask;
 212 sigset_t old_sigmask;
 213 (void)sigemptyset(&sigmask);                           /* Empty mask */
 214 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 216 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 217   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 218     "setitimer() failed: %s", strerror(errno));
 219 (void)sigfillset(&sigmask);                            /* All signals */
 220 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 221 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 223 }
 224
 225
 226
 227
 228 /*************************************************
 229 *         Millisecond sleep function             *
 230 *************************************************/
 231
 232 /* The basic sleep() function has a granularity of 1 second, which is too rough
 233 in some cases - for example, when using an increasing delay to slow down
 234 spammers.
 235
 236 Argument:    number of millseconds
 237 Returns:     nothing
 238 */
 239
 240 void
 241 millisleep(int msec)
 242 {
 243 struct itimerval itval;
 244 itval.it_interval.tv_sec = 0;
 245 itval.it_interval.tv_usec = 0;
 246 itval.it_value.tv_sec = msec/1000;
 247 itval.it_value.tv_usec = (msec % 1000) * 1000;
 248 milliwait(&itval);
 249 }
 250
 251
 252
 253 /*************************************************
 254 *         Compare microsecond times              *
 255 *************************************************/
 256
 257 /*
 258 Arguments:
 259   tv1         the first time
 260   tv2         the second time
 261
 262 Returns:      -1, 0, or +1
 263 */
 264
 265 int
 266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 267 {
 268 if (t1->tv_sec > t2->tv_sec) return +1;
 269 if (t1->tv_sec < t2->tv_sec) return -1;
 270 if (t1->tv_usec > t2->tv_usec) return +1;
 271 if (t1->tv_usec < t2->tv_usec) return -1;
 272 return 0;
 273 }
 274
 275
 276
 277
 278 /*************************************************
 279 *          Clock tick wait function              *
 280 *************************************************/
 281
 282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 283 message IDs, and in file names for maildir deliveries. Because some OS now
 284 re-use pids within the same second, sub-second times are now being used.
 285 However, for absolute certaintly, we must ensure the clock has ticked before
 286 allowing the relevant process to complete. At the time of implementation of
 287 this code (February 2003), the speed of processors is such that the clock will
 288 invariably have ticked already by the time a process has done its job. This
 289 function prepares for the time when things are faster - and it also copes with
 290 clocks that go backwards.
 291
 292 Arguments:
 293   then_tv      A timeval which was used to create uniqueness; its usec field
 294                  has been rounded down to the value of the resolution.
 295                  We want to be sure the current time is greater than this.
 296   resolution   The resolution that was used to divide the microseconds
 297                  (1 for maildir, larger for message ids)
 298
 299 Returns:       nothing
 300 */
 301
 302 void
 303 exim_wait_tick(struct timeval *then_tv, int resolution)
 304 {
 305 struct timeval now_tv;
 306 long int now_true_usec;
 307
 308 (void)gettimeofday(&now_tv, NULL);
 309 now_true_usec = now_tv.tv_usec;
 310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 311
 312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 313   {
 314   struct itimerval itval;
 315   itval.it_interval.tv_sec = 0;
 316   itval.it_interval.tv_usec = 0;
 317   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 318   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 319
 320   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 321   negative value for the microseconds is possible only in the case when "now"
 322   is more than a second less than "then". That means that itval.it_value.tv_sec
 323   is greater than zero. The following correction is therefore safe. */
 324
 325   if (itval.it_value.tv_usec < 0)
 326     {
 327     itval.it_value.tv_usec += 1000000;
 328     itval.it_value.tv_sec -= 1;
 329     }
 330
 331   DEBUG(D_transport|D_receive)
 332     {
 333     if (!running_in_test_harness)
 334       {
 335       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 336         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 337       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 338         itval.it_value.tv_usec);
 339       }
 340     }
 341
 342   milliwait(&itval);
 343   }
 344 }
 345
 346
 347
 348
 349 /*************************************************
 350 *            Set up processing details           *
 351 *************************************************/
 352
 353 /* Save a text string for dumping when SIGUSR1 is received.
 354 Do checks for overruns.
 355
 356 Arguments: format and arguments, as for printf()
 357 Returns:   nothing
 358 */
 359
 360 void
 361 set_process_info(char *format, ...)
 362 {
 363 int len;
 364 va_list ap;
 365 sprintf(CS process_info, "%5d ", (int)getpid());
 366 len = Ustrlen(process_info);
 367 va_start(ap, format);
 368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 369   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 371 va_end(ap);
 372 }
 373
 374
 375
 376
 377
 378 /*************************************************
 379 *   Ensure stdin, stdout, and stderr exist       *
 380 *************************************************/
 381
 382 /* Some operating systems grumble if an exec() happens without a standard
 383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 384 file will be opened and will use these fd values, and then some other bit of
 385 code will assume, for example, that it can write error messages to stderr.
 386 This function ensures that fds 0, 1, and 2 are open if they do not already
 387 exist, by connecting them to /dev/null.
 388
 389 This function is also used to ensure that std{in,out,err} exist at all times,
 390 so that if any library that Exim calls tries to use them, it doesn't crash.
 391
 392 Arguments:  None
 393 Returns:    Nothing
 394 */
 395
 396 void
 397 exim_nullstd(void)
 398 {
 399 int i;
 400 int devnull = -1;
 401 struct stat statbuf;
 402 for (i = 0; i <= 2; i++)
 403   {
 404   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 405     {
 406     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 407     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 408       string_open_failed(errno, "/dev/null"));
 409     if (devnull != i) (void)dup2(devnull, i);
 410     }
 411   }
 412 if (devnull > 2) (void)close(devnull);
 413 }
 414
 415
 416
 417
 418 /*************************************************
 419 *   Close unwanted file descriptors for delivery *
 420 *************************************************/
 421
 422 /* This function is called from a new process that has been forked to deliver
 423 an incoming message, either directly, or using exec.
 424
 425 We want any smtp input streams to be closed in this new process. However, it
 426 has been observed that using fclose() here causes trouble. When reading in -bS
 427 input, duplicate copies of messages have been seen. The files will be sharing a
 428 file pointer with the parent process, and it seems that fclose() (at least on
 429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 430 least sometimes. Hence we go for closing the underlying file descriptors.
 431
 432 If TLS is active, we want to shut down the TLS library, but without molesting
 433 the parent's SSL connection.
 434
 435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 436 stderr unless debugging) because the calling process might have set them up as
 437 pipes and be waiting for them to close before it waits for the submission
 438 process to terminate. If they aren't closed, they hold up the calling process
 439 until the initial delivery process finishes, which is not what we want.
 440
 441 Exception: We do want it for synchronous delivery!
 442
 443 And notwithstanding all the above, if D_resolver is set, implying resolver
 444 debugging, leave stdout open, because that's where the resolver writes its
 445 debugging output.
 446
 447 When we close stderr (which implies we've also closed stdout), we also get rid
 448 of any controlling terminal.
 449
 450 Arguments:   None
 451 Returns:     Nothing
 452 */
 453
 454 static void
 455 close_unwanted(void)
 456 {
 457 if (smtp_input)
 458   {
 459   #ifdef SUPPORT_TLS
 460   tls_close(FALSE);      /* Shut down the TLS library */
 461   #endif
 462   (void)close(fileno(smtp_in));
 463   (void)close(fileno(smtp_out));
 464   smtp_in = NULL;
 465   }
 466 else
 467   {
 468   (void)close(0);                                          /* stdin */
 469   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 470   if (debug_selector == 0)                                 /* stderr */
 471     {
 472     if (!synchronous_delivery)
 473       {
 474       (void)close(2);
 475       log_stderr = NULL;
 476       }
 477     (void)setsid();
 478     }
 479   }
 480 }
 481
 482
 483
 484
 485 /*************************************************
 486 *          Set uid and gid                       *
 487 *************************************************/
 488
 489 /* This function sets a new uid and gid permanently, optionally calling
 490 initgroups() to set auxiliary groups. There are some special cases when running
 491 Exim in unprivileged modes. In these situations the effective uid will not be
 492 root; if we already have the right effective uid/gid, and don't need to
 493 initialize any groups, leave things as they are.
 494
 495 Arguments:
 496   uid        the uid
 497   gid        the gid
 498   igflag     TRUE if initgroups() wanted
 499   msg        text to use in debugging output and failure log
 500
 501 Returns:     nothing; bombs out on failure
 502 */
 503
 504 void
 505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 506 {
 507 uid_t euid = geteuid();
 508 gid_t egid = getegid();
 509
 510 if (euid == root_uid || euid != uid || egid != gid || igflag)
 511   {
 512   /* At least one OS returns +1 for initgroups failure, so just check for
 513   non-zero. */
 514
 515   if (igflag)
 516     {
 517     struct passwd *pw = getpwuid(uid);
 518     if (pw != NULL)
 519       {
 520       if (initgroups(pw->pw_name, gid) != 0)
 521         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 522           (long int)uid, strerror(errno));
 523       }
 524     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 525       "no passwd entry for uid=%ld", (long int)uid);
 526     }
 527
 528   if (setgid(gid) < 0 || setuid(uid) < 0)
 529     {
 530     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 531       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 532     }
 533   }
 534
 535 /* Debugging output included uid/gid and all groups */
 536
 537 DEBUG(D_uid)
 538   {
 539   int group_count;
 540   gid_t group_list[NGROUPS_MAX];
 541   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 542     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 543   group_count = getgroups(NGROUPS_MAX, group_list);
 544   debug_printf("  auxiliary group list:");
 545   if (group_count > 0)
 546     {
 547     int i;
 548     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 549     }
 550   else debug_printf(" <none>");
 551   debug_printf("\n");
 552   }
 553 }
 554
 555
 556
 557
 558 /*************************************************
 559 *               Exit point                       *
 560 *************************************************/
 561
 562 /* Exim exits via this function so that it always clears up any open
 563 databases.
 564
 565 Arguments:
 566   rc         return code
 567
 568 Returns:     does not return
 569 */
 570
 571 void
 572 exim_exit(int rc)
 573 {
 574 search_tidyup();
 575 DEBUG(D_any)
 576   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 577     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 578 exit(rc);
 579 }
 580
 581
 582
 583
 584 /*************************************************
 585 *         Extract port from host address         *
 586 *************************************************/
 587
 588 /* Called to extract the port from the values given to -oMa and -oMi.
 589 It also checks the syntax of the address, and terminates it before the
 590 port data when a port is extracted.
 591
 592 Argument:
 593   address   the address, with possible port on the end
 594
 595 Returns:    the port, or zero if there isn't one
 596             bombs out on a syntax error
 597 */
 598
 599 static int
 600 check_port(uschar *address)
 601 {
 602 int port = host_address_extract_port(address);
 603 if (string_is_ip_address(address, NULL) == 0)
 604   {
 605   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 606   exit(EXIT_FAILURE);
 607   }
 608 return port;
 609 }
 610
 611
 612
 613 /*************************************************
 614 *              Test/verify an address            *
 615 *************************************************/
 616
 617 /* This function is called by the -bv and -bt code. It extracts a working
 618 address from a full RFC 822 address. This isn't really necessary per se, but it
 619 has the effect of collapsing source routes.
 620
 621 Arguments:
 622   s            the address string
 623   flags        flag bits for verify_address()
 624   exit_value   to be set for failures
 625
 626 Returns:       nothing
 627 */
 628
 629 static void
 630 test_address(uschar *s, int flags, int *exit_value)
 631 {
 632 int start, end, domain;
 633 uschar *parse_error = NULL;
 634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 635   FALSE);
 636 if (address == NULL)
 637   {
 638   fprintf(stdout, "syntax error: %s\n", parse_error);
 639   *exit_value = 2;
 640   }
 641 else
 642   {
 643   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 644     -1, -1, NULL, NULL, NULL);
 645   if (rc == FAIL) *exit_value = 2;
 646     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 647   }
 648 }
 649
 650
 651
 652 /*************************************************
 653 *         Decode bit settings for log/debug      *
 654 *************************************************/
 655
 656 /* This function decodes a string containing bit settings in the form of +name
 657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
 658 also recognizes a numeric setting of the form =<number>, but this is not
 659 intended for user use. It's an easy way for Exim to pass the debug settings
 660 when it is re-exec'ed.
 661
 662 The log options are held in two unsigned ints (because there became too many
 663 for one). The top bit in the table means "put in 2nd selector". This does not
 664 yet apply to debug options, so the "=" facility sets only the first selector.
 665
 666 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
 667 It sets all the bits in both selectors. However, there is a facility for then
 668 unsetting certain bits, because we want to turn off "memory" in the debug case.
 669
 670 A bad value for a debug setting is treated as an unknown option - error message
 671 to stderr and die. For log settings, which come from the configuration file,
 672 we write to the log on the way out...
 673
 674 Arguments:
 675   selector1      address of the first bit string
 676   selector2      address of the second bit string, or NULL
 677   notall1        bits to exclude from "all" for selector1
 678   notall2        bits to exclude from "all" for selector2
 679   string         the configured string
 680   options        the table of option names
 681   count          size of table
 682   which          "log" or "debug"
 683
 684 Returns:         nothing on success - bomb out on failure
 685 */
 686
 687 static void
 688 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
 689   int notall2, uschar *string, bit_table *options, int count, uschar *which)
 690 {
 691 uschar *errmsg;
 692 if (string == NULL) return;
 693
 694 if (*string == '=')
 695   {
 696   char *end;    /* Not uschar */
 697   *selector1 = strtoul(CS string+1, &end, 0);
 698   if (*end == 0) return;
 699   errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
 700     string);
 701   goto ERROR_RETURN;
 702   }
 703
 704 /* Handle symbolic setting */
 705
 706 else for(;;)
 707   {
 708   BOOL adding;
 709   uschar *s;
 710   int len;
 711   bit_table *start, *end;
 712
 713   while (isspace(*string)) string++;
 714   if (*string == 0) return;
 715
 716   if (*string != '+' && *string != '-')
 717     {
 718     errmsg = string_sprintf("malformed %s_selector setting: "
 719       "+ or - expected but found \"%s\"", which, string);
 720     goto ERROR_RETURN;
 721     }
 722
 723   adding = *string++ == '+';
 724   s = string;
 725   while (isalnum(*string) || *string == '_') string++;
 726   len = string - s;
 727
 728   start = options;
 729   end = options + count;
 730
 731   while (start < end)
 732     {
 733     bit_table *middle = start + (end - start)/2;
 734     int c = Ustrncmp(s, middle->name, len);
 735     if (c == 0)
 736       {
 737       if (middle->name[len] != 0) c = -1; else
 738         {
 739         unsigned int bit = middle->bit;
 740         unsigned int *selector;
 741
 742         /* The value with all bits set means "force all bits in both selectors"
 743         in the case where two are being handled. However, the top bit in the
 744         second selector is never set. When setting, some bits can be excluded.
 745         */
 746
 747         if (bit == 0xffffffff)
 748           {
 749           if (adding)
 750             {
 751             *selector1 = 0xffffffff ^ notall1;
 752             if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
 753             }
 754           else
 755             {
 756             *selector1 = 0;
 757             if (selector2 != NULL) *selector2 = 0;
 758             }
 759           }
 760
 761         /* Otherwise, the 0x80000000 bit means "this value, without the top
 762         bit, belongs in the second selector". */
 763
 764         else
 765           {
 766           if ((bit & 0x80000000) != 0)
 767             {
 768             selector = selector2;
 769             bit &= 0x7fffffff;
 770             }
 771           else selector = selector1;
 772           if (adding) *selector |= bit; else *selector &= ~bit;
 773           }
 774         break;  /* Out of loop to match selector name */
 775         }
 776       }
 777     if (c < 0) end = middle; else start = middle + 1;
 778     }  /* Loop to match selector name */
 779
 780   if (start >= end)
 781     {
 782     errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
 783       adding? '+' : '-', len, s);
 784     goto ERROR_RETURN;
 785     }
 786   }    /* Loop for selector names */
 787
 788 /* Handle disasters */
 789
 790 ERROR_RETURN:
 791 if (Ustrcmp(which, "debug") == 0)
 792   {
 793   fprintf(stderr, "exim: %s\n", errmsg);
 794   exit(EXIT_FAILURE);
 795   }
 796 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
 797 }
 798
 799
 800
 801 /*************************************************
 802 *          Show supported features               *
 803 *************************************************/
 804
 805 /* This function is called for -bV and for -d to output the optional features
 806 of the current Exim binary.
 807
 808 Arguments:  a FILE for printing
 809 Returns:    nothing
 810 */
 811
 812 static void
 813 show_whats_supported(FILE *f)
 814 {
 815 #ifdef DB_VERSION_STRING
 816 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 817 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 818   #ifdef USE_DB
 819   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 820   #else
 821   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 822   #endif
 823 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 824 fprintf(f, "Probably ndbm\n");
 825 #elif defined(USE_TDB)
 826 fprintf(f, "Using tdb\n");
 827 #else
 828   #ifdef USE_GDBM
 829   fprintf(f, "Probably GDBM (native mode)\n");
 830   #else
 831   fprintf(f, "Probably GDBM (compatibility mode)\n");
 832   #endif
 833 #endif
 834
 835 fprintf(f, "Support for:");
 836 #ifdef SUPPORT_CRYPTEQ
 837   fprintf(f, " crypteq");
 838 #endif
 839 #if HAVE_ICONV
 840   fprintf(f, " iconv()");
 841 #endif
 842 #if HAVE_IPV6
 843   fprintf(f, " IPv6");
 844 #endif
 845 #ifdef SUPPORT_PAM
 846   fprintf(f, " PAM");
 847 #endif
 848 #ifdef EXIM_PERL
 849   fprintf(f, " Perl");
 850 #endif
 851 #ifdef EXPAND_DLFUNC
 852   fprintf(f, " Expand_dlfunc");
 853 #endif
 854 #ifdef USE_TCP_WRAPPERS
 855   fprintf(f, " TCPwrappers");
 856 #endif
 857 #ifdef SUPPORT_TLS
 858   #ifdef USE_GNUTLS
 859   fprintf(f, " GnuTLS");
 860   #else
 861   fprintf(f, " OpenSSL");
 862   #endif
 863 #endif
 864 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 865   fprintf(f, " translate_ip_address");
 866 #endif
 867 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 868   fprintf(f, " move_frozen_messages");
 869 #endif
 870 #ifdef WITH_CONTENT_SCAN
 871   fprintf(f, " Content_Scanning");
 872 #endif
 873 #ifdef WITH_OLD_DEMIME
 874   fprintf(f, " Old_Demime");
 875 #endif
 876 #ifdef EXPERIMENTAL_SPF
 877   fprintf(f, " Experimental_SPF");
 878 #endif
 879 #ifdef EXPERIMENTAL_SRS
 880   fprintf(f, " Experimental_SRS");
 881 #endif
 882 #ifdef EXPERIMENTAL_BRIGHTMAIL
 883   fprintf(f, " Experimental_Brightmail");
 884 #endif
 885 #ifdef EXPERIMENTAL_DOMAINKEYS
 886   fprintf(f, " Experimental_DomainKeys");
 887 #endif
 888 fprintf(f, "\n");
 889
 890 fprintf(f, "Lookups:");
 891 #ifdef LOOKUP_LSEARCH
 892   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 893 #endif
 894 #ifdef LOOKUP_CDB
 895   fprintf(f, " cdb");
 896 #endif
 897 #ifdef LOOKUP_DBM
 898   fprintf(f, " dbm dbmnz");
 899 #endif
 900 #ifdef LOOKUP_DNSDB
 901   fprintf(f, " dnsdb");
 902 #endif
 903 #ifdef LOOKUP_DSEARCH
 904   fprintf(f, " dsearch");
 905 #endif
 906 #ifdef LOOKUP_IBASE
 907   fprintf(f, " ibase");
 908 #endif
 909 #ifdef LOOKUP_LDAP
 910   fprintf(f, " ldap ldapdn ldapm");
 911 #endif
 912 #ifdef LOOKUP_MYSQL
 913   fprintf(f, " mysql");
 914 #endif
 915 #ifdef LOOKUP_NIS
 916   fprintf(f, " nis nis0");
 917 #endif
 918 #ifdef LOOKUP_NISPLUS
 919   fprintf(f, " nisplus");
 920 #endif
 921 #ifdef LOOKUP_ORACLE
 922   fprintf(f, " oracle");
 923 #endif
 924 #ifdef LOOKUP_PASSWD
 925   fprintf(f, " passwd");
 926 #endif
 927 #ifdef LOOKUP_PGSQL
 928   fprintf(f, " pgsql");
 929 #endif
 930 #ifdef LOOKUP_SQLITE
 931   fprintf(f, " sqlite");
 932 #endif
 933 #ifdef LOOKUP_TESTDB
 934   fprintf(f, " testdb");
 935 #endif
 936 #ifdef LOOKUP_WHOSON
 937   fprintf(f, " whoson");
 938 #endif
 939 fprintf(f, "\n");
 940
 941 fprintf(f, "Authenticators:");
 942 #ifdef AUTH_CRAM_MD5
 943   fprintf(f, " cram_md5");
 944 #endif
 945 #ifdef AUTH_CYRUS_SASL
 946   fprintf(f, " cyrus_sasl");
 947 #endif
 948 #ifdef AUTH_PLAINTEXT
 949   fprintf(f, " plaintext");
 950 #endif
 951 #ifdef AUTH_SPA
 952   fprintf(f, " spa");
 953 #endif
 954 fprintf(f, "\n");
 955
 956 fprintf(f, "Routers:");
 957 #ifdef ROUTER_ACCEPT
 958   fprintf(f, " accept");
 959 #endif
 960 #ifdef ROUTER_DNSLOOKUP
 961   fprintf(f, " dnslookup");
 962 #endif
 963 #ifdef ROUTER_IPLITERAL
 964   fprintf(f, " ipliteral");
 965 #endif
 966 #ifdef ROUTER_IPLOOKUP
 967   fprintf(f, " iplookup");
 968 #endif
 969 #ifdef ROUTER_MANUALROUTE
 970   fprintf(f, " manualroute");
 971 #endif
 972 #ifdef ROUTER_QUERYPROGRAM
 973   fprintf(f, " queryprogram");
 974 #endif
 975 #ifdef ROUTER_REDIRECT
 976   fprintf(f, " redirect");
 977 #endif
 978 fprintf(f, "\n");
 979
 980 fprintf(f, "Transports:");
 981 #ifdef TRANSPORT_APPENDFILE
 982   fprintf(f, " appendfile");
 983   #ifdef SUPPORT_MAILDIR
 984     fprintf(f, "/maildir");
 985   #endif
 986   #ifdef SUPPORT_MAILSTORE
 987     fprintf(f, "/mailstore");
 988   #endif
 989   #ifdef SUPPORT_MBX
 990     fprintf(f, "/mbx");
 991   #endif
 992 #endif
 993 #ifdef TRANSPORT_AUTOREPLY
 994   fprintf(f, " autoreply");
 995 #endif
 996 #ifdef TRANSPORT_LMTP
 997   fprintf(f, " lmtp");
 998 #endif
 999 #ifdef TRANSPORT_PIPE
1000   fprintf(f, " pipe");
1001 #endif
1002 #ifdef TRANSPORT_SMTP
1003   fprintf(f, " smtp");
1004 #endif
1005 fprintf(f, "\n");
1006
1007 if (fixed_never_users[0] > 0)
1008   {
1009   int i;
1010   fprintf(f, "Fixed never_users: ");
1011   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1012     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1013   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1014   }
1015
1016 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1017 }
1018
1019
1020
1021
1022 /*************************************************
1023 *               Quote a local part               *
1024 *************************************************/
1025
1026 /* This function is used when a sender address or a From: or Sender: header
1027 line is being created from the caller's login, or from an authenticated_id. It
1028 applies appropriate quoting rules for a local part.
1029
1030 Argument:    the local part
1031 Returns:     the local part, quoted if necessary
1032 */
1033
1034 uschar *
1035 local_part_quote(uschar *lpart)
1036 {
1037 BOOL needs_quote = FALSE;
1038 int size, ptr;
1039 uschar *yield;
1040 uschar *t;
1041
1042 for (t = lpart; !needs_quote && *t != 0; t++)
1043   {
1044   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1045     (*t != '.' || t == lpart || t[1] == 0);
1046   }
1047
1048 if (!needs_quote) return lpart;
1049
1050 size = ptr = 0;
1051 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1052
1053 for (;;)
1054   {
1055   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1056   if (nq == NULL)
1057     {
1058     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1059     break;
1060     }
1061   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1062   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1063   yield = string_cat(yield, &size, &ptr, nq, 1);
1064   lpart = nq + 1;
1065   }
1066
1067 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1068 yield[ptr] = 0;
1069 return yield;
1070 }
1071
1072
1073
1074 #ifdef USE_READLINE
1075 /*************************************************
1076 *         Load readline() functions              *
1077 *************************************************/
1078
1079 /* This function is called from testing executions that read data from stdin,
1080 but only when running as the calling user. Currently, only -be does this. The
1081 function loads the readline() function library and passes back the functions.
1082 On some systems, it needs the curses library, so load that too, but try without
1083 it if loading fails. All this functionality has to be requested at build time.
1084
1085 Arguments:
1086   fn_readline_ptr   pointer to where to put the readline pointer
1087   fn_addhist_ptr    pointer to where to put the addhistory function
1088
1089 Returns:            the dlopen handle or NULL on failure
1090 */
1091
1092 static void *
1093 set_readline(char * (**fn_readline_ptr)(char *),
1094              char * (**fn_addhist_ptr)(char *))
1095 {
1096 void *dlhandle;
1097 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1098
1099 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1100 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1101
1102 if (dlhandle != NULL)
1103   {
1104   *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1105   *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1106   }
1107 else
1108   {
1109   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1110   }
1111
1112 return dlhandle;
1113 }
1114 #endif
1115
1116
1117
1118 /*************************************************
1119 *    Get a line from stdin for testing things    *
1120 *************************************************/
1121
1122 /* This function is called when running tests that can take a number of lines
1123 of input (for example, -be and -bt). It handles continuations and trailing
1124 spaces. And prompting and a blank line output on eof. If readline() is in use,
1125 the arguments are non-NULL and provide the relevant functions.
1126
1127 Arguments:
1128   fn_readline   readline function or NULL
1129   fn_addhist    addhist function or NULL
1130
1131 Returns:        pointer to dynamic memory, or NULL at end of file
1132 */
1133
1134 static uschar *
1135 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1136 {
1137 int i;
1138 int size = 0;
1139 int ptr = 0;
1140 uschar *yield = NULL;
1141
1142 if (fn_readline == NULL) printf("> ");
1143
1144 for (i = 0;; i++)
1145   {
1146   uschar buffer[1024];
1147   uschar *p, *ss;
1148
1149   #ifdef USE_READLINE
1150   char *readline_line = NULL;
1151   if (fn_readline != NULL)
1152     {
1153     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1154     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1155     p = US readline_line;
1156     }
1157   else
1158   #endif
1159
1160   /* readline() not in use */
1161
1162     {
1163     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1164     p = buffer;
1165     }
1166
1167   /* Handle the line */
1168
1169   ss = p + (int)Ustrlen(p);
1170   while (ss > p && isspace(ss[-1])) ss--;
1171
1172   if (i > 0)
1173     {
1174     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1175     }
1176
1177   yield = string_cat(yield, &size, &ptr, p, ss - p);
1178
1179   #ifdef USE_READLINE
1180   if (fn_readline != NULL) free(readline_line);
1181   #endif
1182
1183   if (ss == p || yield[ptr-1] != '\\')
1184     {
1185     yield[ptr] = 0;
1186     break;
1187     }
1188   yield[--ptr] = 0;
1189   }
1190
1191 if (yield == NULL) printf("\n");
1192 return yield;
1193 }
1194
1195
1196
1197 /*************************************************
1198 *          Entry point and high-level code       *
1199 *************************************************/
1200
1201 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1202 the appropriate action. All the necessary functions are present in the one
1203 binary. I originally thought one should split it up, but it turns out that so
1204 much of the apparatus is needed in each chunk that one might as well just have
1205 it all available all the time, which then makes the coding easier as well.
1206
1207 Arguments:
1208   argc      count of entries in argv
1209   argv      argument strings, with argv[0] being the program name
1210
1211 Returns:    EXIT_SUCCESS if terminated successfully
1212             EXIT_FAILURE otherwise, except when a message has been sent
1213               to the sender, and -oee was given
1214 */
1215
1216 int
1217 main(int argc, char **cargv)
1218 {
1219 uschar **argv = USS cargv;
1220 int  arg_receive_timeout = -1;
1221 int  arg_smtp_receive_timeout = -1;
1222 int  arg_error_handling = error_handling;
1223 int  filter_sfd = -1;
1224 int  filter_ufd = -1;
1225 int  group_count;
1226 int  i;
1227 int  list_queue_option = 0;
1228 int  msg_action = 0;
1229 int  msg_action_arg = -1;
1230 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1231 int  queue_only_reason = 0;
1232 #ifdef EXIM_PERL
1233 int  perl_start_option = 0;
1234 #endif
1235 int  recipients_arg = argc;
1236 int  sender_address_domain = 0;
1237 int  test_retry_arg = -1;
1238 int  test_rewrite_arg = -1;
1239 BOOL arg_queue_only = FALSE;
1240 BOOL bi_option = FALSE;
1241 BOOL checking = FALSE;
1242 BOOL count_queue = FALSE;
1243 BOOL expansion_test = FALSE;
1244 BOOL extract_recipients = FALSE;
1245 BOOL forced_delivery = FALSE;
1246 BOOL f_end_dot = FALSE;
1247 BOOL deliver_give_up = FALSE;
1248 BOOL list_queue = FALSE;
1249 BOOL list_options = FALSE;
1250 BOOL local_queue_only;
1251 BOOL more = TRUE;
1252 BOOL one_msg_action = FALSE;
1253 BOOL queue_only_set = FALSE;
1254 BOOL receiving_message = TRUE;
1255 BOOL unprivileged;
1256 BOOL removed_privilege = FALSE;
1257 BOOL verify_address_mode = FALSE;
1258 BOOL verify_as_sender = FALSE;
1259 BOOL version_printed = FALSE;
1260 uschar *alias_arg = NULL;
1261 uschar *called_as = US"";
1262 uschar *start_queue_run_id = NULL;
1263 uschar *stop_queue_run_id = NULL;
1264 uschar *ftest_domain = NULL;
1265 uschar *ftest_localpart = NULL;
1266 uschar *ftest_prefix = NULL;
1267 uschar *ftest_suffix = NULL;
1268 uschar *real_sender_address;
1269 uschar *originator_home = US"/";
1270 void *reset_point;
1271
1272 struct passwd *pw;
1273 struct stat statbuf;
1274 pid_t passed_qr_pid = (pid_t)0;
1275 int passed_qr_pipe = -1;
1276 gid_t group_list[NGROUPS_MAX];
1277
1278 /* Possible options for -R and -S */
1279
1280 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1281
1282 /* Need to define this in case we need to change the environment in order
1283 to get rid of a bogus time zone. We have to make it char rather than uschar
1284 because some OS define it in /usr/include/unistd.h. */
1285
1286 extern char **environ;
1287
1288 /* If the Exim user and/or group and/or the configuration file owner/group were
1289 defined by ref:name at build time, we must now find the actual uid/gid values.
1290 This is a feature to make the lives of binary distributors easier. */
1291
1292 #ifdef EXIM_USERNAME
1293 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1294   {
1295   exim_gid = pw->pw_gid;
1296   }
1297 else
1298   {
1299   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1300     EXIM_USERNAME);
1301   exit(EXIT_FAILURE);
1302   }
1303 #endif
1304
1305 #ifdef EXIM_GROUPNAME
1306 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1307   {
1308   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1309     EXIM_GROUPNAME);
1310   exit(EXIT_FAILURE);
1311   }
1312 #endif
1313
1314 #ifdef CONFIGURE_OWNERNAME
1315 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1316   {
1317   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1318     CONFIGURE_OWNERNAME);
1319   exit(EXIT_FAILURE);
1320   }
1321 #endif
1322
1323 #ifdef CONFIGURE_GROUPNAME
1324 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1325   {
1326   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1327     CONFIGURE_GROUPNAME);
1328   exit(EXIT_FAILURE);
1329   }
1330 #endif
1331
1332 /* In the Cygwin environment, some initialization needs doing. It is fudged
1333 in by means of this macro. */
1334
1335 #ifdef OS_INIT
1336 OS_INIT
1337 #endif
1338
1339 /* Check a field which is patched when we are running Exim within its
1340 testing harness; do a fast initial check, and then the whole thing. */
1341
1342 running_in_test_harness =
1343   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1344
1345 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1346 at the start of a program; however, it seems that some environments do not
1347 follow this. A "strange" locale can affect the formatting of timestamps, so we
1348 make quite sure. */
1349
1350 setlocale(LC_ALL, "C");
1351
1352 /* Set up the default handler for timing using alarm(). */
1353
1354 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1355
1356 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1357 because store_malloc writes a log entry on failure. */
1358
1359 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1360 if (log_buffer == NULL)
1361   {
1362   fprintf(stderr, "exim: failed to get store for log buffer\n");
1363   exit(EXIT_FAILURE);
1364   }
1365
1366 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1367 NULL when the daemon is run and the file is closed. We have to use this
1368 indirection, because some systems don't allow writing to the variable "stderr".
1369 */
1370
1371 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1372
1373 /* Arrange for the PCRE regex library to use our store functions. Note that
1374 the normal calls are actually macros that add additional arguments for
1375 debugging purposes so we have to assign specially constructed functions here.
1376 The default is to use store in the stacking pool, but this is overridden in the
1377 regex_must_compile() function. */
1378
1379 pcre_malloc = function_store_get;
1380 pcre_free = function_dummy_free;
1381
1382 /* Ensure there is a big buffer for temporary use in several places. It is put
1383 in malloc store so that it can be freed for enlargement if necessary. */
1384
1385 big_buffer = store_malloc(big_buffer_size);
1386
1387 /* Set up the handler for the data request signal, and set the initial
1388 descriptive text. */
1389
1390 set_process_info("initializing");
1391 os_restarting_signal(SIGUSR1, usr1_handler);
1392
1393 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1394 in the daemon code. For the rest of Exim's uses, we ignore it. */
1395
1396 signal(SIGHUP, SIG_IGN);
1397
1398 /* We don't want to die on pipe errors as the code is written to handle
1399 the write error instead. */
1400
1401 signal(SIGPIPE, SIG_IGN);
1402
1403 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1404 set to SIG_IGN. This causes subprocesses that complete before the parent
1405 process waits for them not to hang around, so when Exim calls wait(), nothing
1406 is there. The wait() code has been made robust against this, but let's ensure
1407 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1408 ending status. We use sigaction rather than plain signal() on those OS where
1409 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1410 problem on AIX with this.) */
1411
1412 #ifdef SA_NOCLDWAIT
1413   {
1414   struct sigaction act;
1415   act.sa_handler = SIG_DFL;
1416   sigemptyset(&(act.sa_mask));
1417   act.sa_flags = 0;
1418   sigaction(SIGCHLD, &act, NULL);
1419   }
1420 #else
1421 signal(SIGCHLD, SIG_DFL);
1422 #endif
1423
1424 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1425 SIGHUP. */
1426
1427 sighup_argv = argv;
1428
1429 /* Set up the version number. Set up the leading 'E' for the external form of
1430 message ids, set the pointer to the internal form, and initialize it to
1431 indicate no message being processed. */
1432
1433 version_init();
1434 message_id_option[0] = '-';
1435 message_id_external = message_id_option + 1;
1436 message_id_external[0] = 'E';
1437 message_id = message_id_external + 1;
1438 message_id[0] = 0;
1439
1440 /* Set the umask to zero so that any files that Exim creates are created
1441 with the modes that it specifies. */
1442
1443 umask(0);
1444
1445 /* Precompile the regular expression for matching a message id. Keep this in
1446 step with the code that generates ids in the accept.c module. We need to do
1447 this here, because the -M options check their arguments for syntactic validity
1448 using mac_ismsgid, which uses this. */
1449
1450 regex_ismsgid =
1451   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1452
1453 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1454 this seems to be a generally accepted convention, since one finds symbolic
1455 links called "mailq" in standard OS configurations. */
1456
1457 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1458     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1459   {
1460   list_queue = TRUE;
1461   receiving_message = FALSE;
1462   called_as = US"-mailq";
1463   }
1464
1465 /* If the program is called as "rmail" treat it as equivalent to
1466 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1467 i.e. preventing a single dot on a line from terminating the message, and
1468 returning with zero return code, even in cases of error (provided an error
1469 message has been sent). */
1470
1471 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1472     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1473   {
1474   dot_ends = FALSE;
1475   called_as = US"-rmail";
1476   errors_sender_rc = EXIT_SUCCESS;
1477   }
1478
1479 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1480 this is a smail convention. */
1481
1482 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1483     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1484   {
1485   smtp_input = smtp_batched_input = TRUE;
1486   called_as = US"-rsmtp";
1487   }
1488
1489 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1490 this is a smail convention. */
1491
1492 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1493     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1494   {
1495   queue_interval = 0;
1496   receiving_message = FALSE;
1497   called_as = US"-runq";
1498   }
1499
1500 /* If the program is called as "newaliases" treat it as equivalent to
1501 "exim -bi"; this is a sendmail convention. */
1502
1503 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1504     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1505   {
1506   bi_option = TRUE;
1507   receiving_message = FALSE;
1508   called_as = US"-newaliases";
1509   }
1510
1511 /* Save the original effective uid for a couple of uses later. It should
1512 normally be root, but in some esoteric environments it may not be. */
1513
1514 original_euid = geteuid();
1515
1516 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1517 to be the same as the real ones. This makes a difference only if Exim is setuid
1518 (or setgid) to something other than root, which could be the case in some
1519 special configurations. */
1520
1521 real_uid = getuid();
1522 real_gid = getgid();
1523
1524 if (real_uid == root_uid)
1525   {
1526   setgid(real_gid);
1527   setuid(real_uid);
1528   }
1529
1530 /* If neither the original real uid nor the original euid was root, Exim is
1531 running in an unprivileged state. */
1532
1533 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1534
1535 /* If the first argument is --help, pretend there are no arguments. This will
1536 cause a brief message to be given. */
1537
1538 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1539
1540 /* Scan the program's arguments. Some can be dealt with right away; others are
1541 simply recorded for checking and handling afterwards. Do a high-level switch
1542 on the second character (the one after '-'), to save some effort. */
1543
1544 for (i = 1; i < argc; i++)
1545   {
1546   BOOL badarg = FALSE;
1547   uschar *arg = argv[i];
1548   uschar *argrest;
1549   int switchchar;
1550
1551   /* An argument not starting with '-' is the start of a recipients list;
1552   break out of the options-scanning loop. */
1553
1554   if (arg[0] != '-')
1555     {
1556     recipients_arg = i;
1557     break;
1558     }
1559
1560   /* An option consistion of -- terminates the options */
1561
1562   if (Ustrcmp(arg, "--") == 0)
1563     {
1564     recipients_arg = i + 1;
1565     break;
1566     }
1567
1568   /* Handle flagged options */
1569
1570   switchchar = arg[1];
1571   argrest = arg+2;
1572
1573   /* Make all -ex options synonymous with -oex arguments, since that
1574   is assumed by various callers. Also make -qR options synonymous with -R
1575   options, as that seems to be required as well. Allow for -qqR too, and
1576   the same for -S options. */
1577
1578   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1579       Ustrncmp(arg+1, "qR", 2) == 0 ||
1580       Ustrncmp(arg+1, "qS", 2) == 0)
1581     {
1582     switchchar = arg[2];
1583     argrest++;
1584     }
1585   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1586     {
1587     switchchar = arg[3];
1588     argrest += 2;
1589     queue_2stage = TRUE;
1590     }
1591
1592   /* Make -r synonymous with -f, since it is a documented alias */
1593
1594   else if (arg[1] == 'r') switchchar = 'f';
1595
1596   /* Make -ov synonymous with -v */
1597
1598   else if (Ustrcmp(arg, "-ov") == 0)
1599     {
1600     switchchar = 'v';
1601     argrest++;
1602     }
1603
1604   /* High-level switch on active initial letter */
1605
1606   switch(switchchar)
1607     {
1608     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1609     so has no need of it. */
1610
1611     case 'B':
1612     if (*argrest == 0) i++;       /* Skip over the type */
1613     break;
1614
1615
1616     case 'b':
1617     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1618
1619     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1620        -bdf: Ditto, but in the foreground.
1621     */
1622
1623     if (*argrest == 'd')
1624       {
1625       daemon_listen = TRUE;
1626       if (*(++argrest) == 'f') background_daemon = FALSE;
1627         else if (*argrest != 0) { badarg = TRUE; break; }
1628       }
1629
1630     /* -be: Run in expansion test mode */
1631
1632     else if (*argrest == 'e')
1633       expansion_test = checking = TRUE;
1634
1635     /* -bF:  Run system filter test */
1636
1637     else if (*argrest == 'F')
1638       {
1639       filter_test |= FTEST_SYSTEM;
1640       if (*(++argrest) != 0) { badarg = TRUE; break; }
1641       if (++i < argc) filter_test_sfile = argv[i]; else
1642         {
1643         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1644         exit(EXIT_FAILURE);
1645         }
1646       }
1647
1648     /* -bf:  Run user filter test
1649        -bfd: Set domain for filter testing
1650        -bfl: Set local part for filter testing
1651        -bfp: Set prefix for filter testing
1652        -bfs: Set suffix for filter testing
1653     */
1654
1655     else if (*argrest == 'f')
1656       {
1657       if (*(++argrest) == 0)
1658         {
1659         filter_test |= FTEST_USER;
1660         if (++i < argc) filter_test_ufile = argv[i]; else
1661           {
1662           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1663           exit(EXIT_FAILURE);
1664           }
1665         }
1666       else
1667         {
1668         if (++i >= argc)
1669           {
1670           fprintf(stderr, "exim: string expected after %s\n", arg);
1671           exit(EXIT_FAILURE);
1672           }
1673         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1674         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1675         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1676         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1677         else { badarg = TRUE; break; }
1678         }
1679       }
1680
1681     /* -bh: Host checking - an IP address must follow. */
1682
1683     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1684       {
1685       if (++i >= argc) { badarg = TRUE; break; }
1686       sender_host_address = argv[i];
1687       host_checking = checking = log_testing_mode = TRUE;
1688       host_checking_callout = argrest[1] == 'c';
1689       }
1690
1691     /* -bi: This option is used by sendmail to initialize *the* alias file,
1692     though it has the -oA option to specify a different file. Exim has no
1693     concept of *the* alias file, but since Sun's YP make script calls
1694     sendmail this way, some support must be provided. */
1695
1696     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1697
1698     /* -bm: Accept and deliver message - the default option. Reinstate
1699     receiving_message, which got turned off for all -b options. */
1700
1701     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1702
1703     /* -bnq: For locally originating messages, do not qualify unqualified
1704     addresses. In the envelope, this causes errors; in header lines they
1705     just get left. */
1706
1707     else if (Ustrcmp(argrest, "nq") == 0)
1708       {
1709       allow_unqualified_sender = FALSE;
1710       allow_unqualified_recipient = FALSE;
1711       }
1712
1713     /* -bpxx: List the contents of the mail queue, in various forms. If
1714     the option is -bpc, just a queue count is needed. Otherwise, if the
1715     first letter after p is r, then order is random. */
1716
1717     else if (*argrest == 'p')
1718       {
1719       if (*(++argrest) == 'c')
1720         {
1721         count_queue = TRUE;
1722         if (*(++argrest) != 0) badarg = TRUE;
1723         break;
1724         }
1725
1726       if (*argrest == 'r')
1727         {
1728         list_queue_option = 8;
1729         argrest++;
1730         }
1731       else list_queue_option = 0;
1732
1733       list_queue = TRUE;
1734
1735       /* -bp: List the contents of the mail queue, top-level only */
1736
1737       if (*argrest == 0) {}
1738
1739       /* -bpu: List the contents of the mail queue, top-level undelivered */
1740
1741       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1742
1743       /* -bpa: List the contents of the mail queue, including all delivered */
1744
1745       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1746
1747       /* Unknown after -bp[r] */
1748
1749       else
1750         {
1751         badarg = TRUE;
1752         break;
1753         }
1754       }
1755
1756
1757     /* -bP: List the configuration variables given as the address list.
1758     Force -v, so configuration errors get displayed. */
1759
1760     else if (Ustrcmp(argrest, "P") == 0)
1761       {
1762       list_options = TRUE;
1763       debug_selector |= D_v;
1764       debug_file = stderr;
1765       }
1766
1767     /* -brt: Test retry configuration lookup */
1768
1769     else if (Ustrcmp(argrest, "rt") == 0)
1770       {
1771       test_retry_arg = i + 1;
1772       goto END_ARG;
1773       }
1774
1775     /* -brw: Test rewrite configuration */
1776
1777     else if (Ustrcmp(argrest, "rw") == 0)
1778       {
1779       test_rewrite_arg = i + 1;
1780       goto END_ARG;
1781       }
1782
1783     /* -bS: Read SMTP commands on standard input, but produce no replies -
1784     all errors are reported by sending messages. */
1785
1786     else if (Ustrcmp(argrest, "S") == 0)
1787       smtp_input = smtp_batched_input = receiving_message = TRUE;
1788
1789     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1790     on standard output. */
1791
1792     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1793
1794     /* -bt: address testing mode */
1795
1796     else if (Ustrcmp(argrest, "t") == 0)
1797       address_test_mode = checking = log_testing_mode = TRUE;
1798
1799     /* -bv: verify addresses */
1800
1801     else if (Ustrcmp(argrest, "v") == 0)
1802       verify_address_mode = checking = log_testing_mode = TRUE;
1803
1804     /* -bvs: verify sender addresses */
1805
1806     else if (Ustrcmp(argrest, "vs") == 0)
1807       {
1808       verify_address_mode = checking = log_testing_mode = TRUE;
1809       verify_as_sender = TRUE;
1810       }
1811
1812     /* -bV: Print version string and support details */
1813
1814     else if (Ustrcmp(argrest, "V") == 0)
1815       {
1816       printf("Exim version %s #%s built %s\n", version_string,
1817         version_cnumber, version_date);
1818       printf("%s\n", CS version_copyright);
1819       version_printed = TRUE;
1820       show_whats_supported(stdout);
1821       }
1822
1823     else badarg = TRUE;
1824     break;
1825
1826
1827     /* -C: change configuration file list; ignore if it isn't really
1828     a change! Enforce a prefix check if required. */
1829
1830     case 'C':
1831     if (*argrest == 0)
1832       {
1833       if(++i < argc) argrest = argv[i]; else
1834         { badarg = TRUE; break; }
1835       }
1836     if (Ustrcmp(config_main_filelist, argrest) != 0)
1837       {
1838       #ifdef ALT_CONFIG_PREFIX
1839       int sep = 0;
1840       int len = Ustrlen(ALT_CONFIG_PREFIX);
1841       uschar *list = argrest;
1842       uschar *filename;
1843       while((filename = string_nextinlist(&list, &sep, big_buffer,
1844              big_buffer_size)) != NULL)
1845         {
1846         if ((Ustrlen(filename) < len ||
1847              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1848              Ustrstr(filename, "/../") != NULL) &&
1849              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1850           {
1851           fprintf(stderr, "-C Permission denied\n");
1852           exit(EXIT_FAILURE);
1853           }
1854         }
1855       #endif
1856
1857       config_main_filelist = argrest;
1858       config_changed = TRUE;
1859       }
1860     break;
1861
1862
1863     /* -D: set up a macro definition */
1864
1865     case 'D':
1866     #ifdef DISABLE_D_OPTION
1867     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1868     exit(EXIT_FAILURE);
1869     #else
1870       {
1871       int ptr = 0;
1872       macro_item *mlast = NULL;
1873       macro_item *m;
1874       uschar name[24];
1875       uschar *s = argrest;
1876
1877       while (isspace(*s)) s++;
1878
1879       if (*s < 'A' || *s > 'Z')
1880         {
1881         fprintf(stderr, "exim: macro name set by -D must start with "
1882           "an upper case letter\n");
1883         exit(EXIT_FAILURE);
1884         }
1885
1886       while (isalnum(*s) || *s == '_')
1887         {
1888         if (ptr < sizeof(name)-1) name[ptr++] = *s;
1889         s++;
1890         }
1891       name[ptr] = 0;
1892       if (ptr == 0) { badarg = TRUE; break; }
1893       while (isspace(*s)) s++;
1894       if (*s != 0)
1895         {
1896         if (*s++ != '=') { badarg = TRUE; break; }
1897         while (isspace(*s)) s++;
1898         }
1899
1900       for (m = macros; m != NULL; m = m->next)
1901         {
1902         if (Ustrcmp(m->name, name) == 0)
1903           {
1904           fprintf(stderr, "exim: duplicated -D in command line\n");
1905           exit(EXIT_FAILURE);
1906           }
1907         mlast = m;
1908         }
1909
1910       m = store_get(sizeof(macro_item) + Ustrlen(name));
1911       m->next = NULL;
1912       m->command_line = TRUE;
1913       if (mlast == NULL) macros = m; else mlast->next = m;
1914       Ustrcpy(m->name, name);
1915       m->replacement = string_copy(s);
1916
1917       if (clmacro_count >= MAX_CLMACROS)
1918         {
1919         fprintf(stderr, "exim: too many -D options on command line\n");
1920         exit(EXIT_FAILURE);
1921         }
1922       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1923         m->replacement);
1924       }
1925     #endif
1926     break;
1927
1928     /* -d: Set debug level (see also -v below) or set the drop_cr option.
1929     The latter is now a no-op, retained for compatibility only. If -dd is used,
1930     debugging subprocesses of the daemon is disabled. */
1931
1932     case 'd':
1933     if (Ustrcmp(argrest, "ropcr") == 0)
1934       {
1935       /* drop_cr = TRUE; */
1936       }
1937
1938     /* Use an intermediate variable so that we don't set debugging while
1939     decoding the debugging bits. */
1940
1941     else
1942       {
1943       unsigned int selector = D_default;
1944       debug_selector = 0;
1945       debug_file = NULL;
1946       if (*argrest == 'd')
1947         {
1948         debug_daemon = TRUE;
1949         argrest++;
1950         }
1951       if (*argrest != 0)
1952         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1953           debug_options_count, US"debug");
1954       debug_selector = selector;
1955       }
1956     break;
1957
1958
1959     /* -E: This is a local error message. This option is not intended for
1960     external use at all, but is not restricted to trusted callers because it
1961     does no harm (just suppresses certain error messages) and if Exim is run
1962     not setuid root it won't always be trusted when it generates error
1963     messages using this option. If there is a message id following -E, point
1964     message_reference at it, for logging. */
1965
1966     case 'E':
1967     local_error_message = TRUE;
1968     if (mac_ismsgid(argrest)) message_reference = argrest;
1969     break;
1970
1971
1972     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1973     option, so it looks as if historically the -oex options are also callable
1974     without the leading -o. So we have to accept them. Before the switch,
1975     anything starting -oe has been converted to -e. Exim does not support all
1976     of the sendmail error options. */
1977
1978     case 'e':
1979     if (Ustrcmp(argrest, "e") == 0)
1980       {
1981       arg_error_handling = ERRORS_SENDER;
1982       errors_sender_rc = EXIT_SUCCESS;
1983       }
1984     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1985     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1986     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1987     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1988     else badarg = TRUE;
1989     break;
1990
1991
1992     /* -F: Set sender's full name, used instead of the gecos entry from
1993     the password file. Since users can usually alter their gecos entries,
1994     there's no security involved in using this instead. The data can follow
1995     the -F or be in the next argument. */
1996
1997     case 'F':
1998     if (*argrest == 0)
1999       {
2000       if(++i < argc) argrest = argv[i]; else
2001         { badarg = TRUE; break; }
2002       }
2003     originator_name = argrest;
2004     sender_name_forced = TRUE;
2005     break;
2006
2007
2008     /* -f: Set sender's address - this value is only actually used if Exim is
2009     run by a trusted user, or if untrusted_set_sender is set and matches the
2010     address, except that the null address can always be set by any user. The
2011     test for this happens later, when the value given here is ignored when not
2012     permitted. For an untrusted user, the actual sender is still put in Sender:
2013     if it doesn't match the From: header (unless no_local_from_check is set).
2014     The data can follow the -f or be in the next argument. The -r switch is an
2015     obsolete form of -f but since there appear to be programs out there that
2016     use anything that sendmail has ever supported, better accept it - the
2017     synonymizing is done before the switch above.
2018
2019     At this stage, we must allow domain literal addresses, because we don't
2020     know what the setting of allow_domain_literals is yet. Ditto for trailing
2021     dots and strip_trailing_dot. */
2022
2023     case 'f':
2024       {
2025       int start, end;
2026       uschar *errmess;
2027       if (*argrest == 0)
2028         {
2029         if (i+1 < argc) argrest = argv[++i]; else
2030           { badarg = TRUE; break; }
2031         }
2032       if (*argrest == 0)
2033         {
2034         sender_address = string_sprintf("");  /* Ensure writeable memory */
2035         }
2036       else
2037         {
2038         uschar *temp = argrest + Ustrlen(argrest) - 1;
2039         while (temp >= argrest && isspace(*temp)) temp--;
2040         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2041         allow_domain_literals = TRUE;
2042         strip_trailing_dot = TRUE;
2043         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2044           &sender_address_domain, TRUE);
2045         allow_domain_literals = FALSE;
2046         strip_trailing_dot = FALSE;
2047         if (sender_address == NULL)
2048           {
2049           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2050           return EXIT_FAILURE;
2051           }
2052         }
2053       sender_address_forced = TRUE;
2054       }
2055     break;
2056
2057     /* This is some Sendmail thing which can be ignored */
2058
2059     case 'G':
2060     break;
2061
2062     /* -h: Set the hop count for an incoming message. Exim does not currently
2063     support this; it always computes it by counting the Received: headers.
2064     To put it in will require a change to the spool header file format. */
2065
2066     case 'h':
2067     if (*argrest == 0)
2068       {
2069       if(++i < argc) argrest = argv[i]; else
2070         { badarg = TRUE; break; }
2071       }
2072     if (!isdigit(*argrest)) badarg = TRUE;
2073     break;
2074
2075
2076     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2077     not to be documented for sendmail but mailx (at least) uses it) */
2078
2079     case 'i':
2080     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2081     break;
2082
2083
2084     case 'M':
2085     receiving_message = FALSE;
2086
2087     /* -MC:  continue delivery of another message via an existing open
2088     file descriptor. This option is used for an internal call by the
2089     smtp transport when there is a pending message waiting to go to an
2090     address to which it has got a connection. Five subsequent arguments are
2091     required: transport name, host name, IP address, sequence number, and
2092     message_id. Transports may decline to create new processes if the sequence
2093     number gets too big. The channel is stdin. This (-MC) must be the last
2094     argument. There's a subsequent check that the real-uid is privileged.
2095
2096     If we are running in the test harness. delay for a bit, to let the process
2097     that set this one up complete. This makes for repeatability of the logging,
2098     etc. output. */
2099
2100     if (Ustrcmp(argrest, "C") == 0)
2101       {
2102       if (argc != i + 6)
2103         {
2104         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2105         return EXIT_FAILURE;
2106         }
2107
2108       if (msg_action_arg >= 0)
2109         {
2110         fprintf(stderr, "exim: incompatible arguments\n");
2111         return EXIT_FAILURE;
2112         }
2113
2114       continue_transport = argv[++i];
2115       continue_hostname = argv[++i];
2116       continue_host_address = argv[++i];
2117       continue_sequence = Uatoi(argv[++i]);
2118       msg_action = MSG_DELIVER;
2119       msg_action_arg = ++i;
2120       forced_delivery = TRUE;
2121       queue_run_pid = passed_qr_pid;
2122       queue_run_pipe = passed_qr_pipe;
2123
2124       if (!mac_ismsgid(argv[i]))
2125         {
2126         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2127           argv[i]);
2128         return EXIT_FAILURE;
2129         }
2130
2131       if (running_in_test_harness) millisleep(500);
2132       break;
2133       }
2134
2135     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2136     precedes -MC (see above). The flag indicates that the host to which
2137     Exim is connected has accepted an AUTH sequence. */
2138
2139     else if (Ustrcmp(argrest, "CA") == 0)
2140       {
2141       smtp_authenticated = TRUE;
2142       break;
2143       }
2144
2145     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2146     it preceded -MC (see above) */
2147
2148     else if (Ustrcmp(argrest, "CP") == 0)
2149       {
2150       smtp_use_pipelining = TRUE;
2151       break;
2152       }
2153
2154     /* -MCQ: pass on the pid of the queue-running process that started
2155     this chain of deliveries and the fd of its synchronizing pipe; this
2156     is useful only when it precedes -MC (see above) */
2157
2158     else if (Ustrcmp(argrest, "CQ") == 0)
2159       {
2160       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2161         else badarg = TRUE;
2162       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2163         else badarg = TRUE;
2164       break;
2165       }
2166
2167     /* -MCS: set the smtp_use_size flag; this is useful only when it
2168     precedes -MC (see above) */
2169
2170     else if (Ustrcmp(argrest, "CS") == 0)
2171       {
2172       smtp_use_size = TRUE;
2173       break;
2174       }
2175
2176     /* -MCT: set the tls_offered flag; this is useful only when it
2177     precedes -MC (see above). The flag indicates that the host to which
2178     Exim is connected has offered TLS support. */
2179
2180     #ifdef SUPPORT_TLS
2181     else if (Ustrcmp(argrest, "CT") == 0)
2182       {
2183       tls_offered = TRUE;
2184       break;
2185       }
2186     #endif
2187
2188     /* -M[x]: various operations on the following list of message ids:
2189        -M    deliver the messages, ignoring next retry times and thawing
2190        -Mc   deliver the messages, checking next retry times, no thawing
2191        -Mf   freeze the messages
2192        -Mg   give up on the messages
2193        -Mt   thaw the messages
2194        -Mrm  remove the messages
2195     In the above cases, this must be the last option. There are also the
2196     following options which are followed by a single message id, and which
2197     act on that message. Some of them use the "recipient" addresses as well.
2198        -Mar  add recipient(s)
2199        -Mmad mark all recipients delivered
2200        -Mmd  mark recipients(s) delivered
2201        -Mes  edit sender
2202        -Mvb  show body
2203        -Mvh  show header
2204        -Mvl  show log
2205     */
2206
2207     else if (*argrest == 0)
2208       {
2209       msg_action = MSG_DELIVER;
2210       forced_delivery = deliver_force_thaw = TRUE;
2211       }
2212     else if (Ustrcmp(argrest, "ar") == 0)
2213       {
2214       msg_action = MSG_ADD_RECIPIENT;
2215       one_msg_action = TRUE;
2216       }
2217     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2218     else if (Ustrcmp(argrest, "es") == 0)
2219       {
2220       msg_action = MSG_EDIT_SENDER;
2221       one_msg_action = TRUE;
2222       }
2223     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2224     else if (Ustrcmp(argrest, "g") == 0)
2225       {
2226       msg_action = MSG_DELIVER;
2227       deliver_give_up = TRUE;
2228       }
2229     else if (Ustrcmp(argrest, "mad") == 0)
2230       {
2231       msg_action = MSG_MARK_ALL_DELIVERED;
2232       }
2233     else if (Ustrcmp(argrest, "md") == 0)
2234       {
2235       msg_action = MSG_MARK_DELIVERED;
2236       one_msg_action = TRUE;
2237       }
2238     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2239     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2240     else if (Ustrcmp(argrest, "vb") == 0)
2241       {
2242       msg_action = MSG_SHOW_BODY;
2243       one_msg_action = TRUE;
2244       }
2245     else if (Ustrcmp(argrest, "vh") == 0)
2246       {
2247       msg_action = MSG_SHOW_HEADER;
2248       one_msg_action = TRUE;
2249       }
2250     else if (Ustrcmp(argrest, "vl") == 0)
2251       {
2252       msg_action = MSG_SHOW_LOG;
2253       one_msg_action = TRUE;
2254       }
2255     else { badarg = TRUE; break; }
2256
2257     /* All the -Mxx options require at least one message id. */
2258
2259     msg_action_arg = i + 1;
2260     if (msg_action_arg >= argc)
2261       {
2262       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2263       return EXIT_FAILURE;
2264       }
2265
2266     /* Some require only message ids to follow */
2267
2268     if (!one_msg_action)
2269       {
2270       int j;
2271       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2272         {
2273         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2274           argv[j], arg);
2275         return EXIT_FAILURE;
2276         }
2277       goto END_ARG;   /* Remaining args are ids */
2278       }
2279
2280     /* Others require only one message id, possibly followed by addresses,
2281     which will be handled as normal arguments. */
2282
2283     else
2284       {
2285       if (!mac_ismsgid(argv[msg_action_arg]))
2286         {
2287         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2288           argv[msg_action_arg], arg);
2289         return EXIT_FAILURE;
2290         }
2291       i++;
2292       }
2293     break;
2294
2295
2296     /* Some programs seem to call the -om option without the leading o;
2297     for sendmail it askes for "me too". Exim always does this. */
2298
2299     case 'm':
2300     if (*argrest != 0) badarg = TRUE;
2301     break;
2302
2303
2304     /* -N: don't do delivery - a debugging option that stops transports doing
2305     their thing. It implies debugging at the D_v level. */
2306
2307     case 'N':
2308     if (*argrest == 0)
2309       {
2310       dont_deliver = TRUE;
2311       debug_selector |= D_v;
2312       debug_file = stderr;
2313       }
2314     else badarg = TRUE;
2315     break;
2316
2317
2318     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2319     it. */
2320
2321     case 'n':
2322     break;
2323
2324     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2325     option to the specified value. This form uses long names. We need to handle
2326     -O option=value and -Ooption=value. */
2327
2328     case 'O':
2329     if (*argrest == 0)
2330       {
2331       if (++i >= argc)
2332         {
2333         fprintf(stderr, "exim: string expected after -O\n");
2334         exit(EXIT_FAILURE);
2335         }
2336       }
2337     break;
2338
2339     case 'o':
2340
2341     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2342     file" option). */
2343
2344     if (*argrest == 'A')
2345       {
2346       alias_arg = argrest + 1;
2347       if (alias_arg[0] == 0)
2348         {
2349         if (i+1 < argc) alias_arg = argv[++i]; else
2350           {
2351           fprintf(stderr, "exim: string expected after -oA\n");
2352           exit(EXIT_FAILURE);
2353           }
2354         }
2355       }
2356
2357     /* -oB: Set a connection message max value for remote deliveries */
2358
2359     else if (*argrest == 'B')
2360       {
2361       uschar *p = argrest + 1;
2362       if (p[0] == 0)
2363         {
2364         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2365           {
2366           connection_max_messages = 1;
2367           p = NULL;
2368           }
2369         }
2370
2371       if (p != NULL)
2372         {
2373         if (!isdigit(*p))
2374           {
2375           fprintf(stderr, "exim: number expected after -oB\n");
2376           exit(EXIT_FAILURE);
2377           }
2378         connection_max_messages = Uatoi(p);
2379         }
2380       }
2381
2382     /* -odb: background delivery */
2383
2384     else if (Ustrcmp(argrest, "db") == 0)
2385       {
2386       synchronous_delivery = FALSE;
2387       arg_queue_only = FALSE;
2388       queue_only_set = TRUE;
2389       }
2390
2391     /* -odf: foreground delivery (smail-compatible option); same effect as
2392        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2393     */
2394
2395     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2396       {
2397       synchronous_delivery = TRUE;
2398       arg_queue_only = FALSE;
2399       queue_only_set = TRUE;
2400       }
2401
2402     /* -odq: queue only */
2403
2404     else if (Ustrcmp(argrest, "dq") == 0)
2405       {
2406       synchronous_delivery = FALSE;
2407       arg_queue_only = TRUE;
2408       queue_only_set = TRUE;
2409       }
2410
2411     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2412     but no remote delivery */
2413
2414     else if (Ustrcmp(argrest, "dqs") == 0)
2415       {
2416       queue_smtp = TRUE;
2417       arg_queue_only = FALSE;
2418       queue_only_set = TRUE;
2419       }
2420
2421     /* -oex: Sendmail error flags. As these are also accepted without the
2422     leading -o prefix, for compatibility with vacation and other callers,
2423     they are handled with -e above. */
2424
2425     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2426        -oitrue: Another sendmail syntax for the same */
2427
2428     else if (Ustrcmp(argrest, "i") == 0 ||
2429              Ustrcmp(argrest, "itrue") == 0)
2430       dot_ends = FALSE;
2431
2432     /* -oM*: Set various characteristics for an incoming message; actually
2433     acted on for trusted callers only. */
2434
2435     else if (*argrest == 'M')
2436       {
2437       if (i+1 >= argc)
2438         {
2439         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2440         exit(EXIT_FAILURE);
2441         }
2442
2443       /* -oMa: Set sender host address */
2444
2445       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2446
2447       /* -oMaa: Set authenticator name */
2448
2449       else if (Ustrcmp(argrest, "Maa") == 0)
2450         sender_host_authenticated = argv[++i];
2451
2452       /* -oMas: setting authenticated sender */
2453
2454       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2455
2456       /* -oMai: setting authenticated id */
2457
2458       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2459
2460       /* -oMi: Set incoming interface address */
2461
2462       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2463
2464       /* -oMr: Received protocol */
2465
2466       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2467
2468       /* -oMs: Set sender host name */
2469
2470       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2471
2472       /* -oMt: Set sender ident */
2473
2474       else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2475
2476       /* Else a bad argument */
2477
2478       else
2479         {
2480         badarg = TRUE;
2481         break;
2482         }
2483       }
2484
2485     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2486     seem to call this as -m (undocumented), so that is also accepted (see
2487     above). */
2488
2489     else if (Ustrcmp(argrest, "m") == 0) {}
2490
2491     /* -oo: An ancient flag for old-style addresses which still seems to
2492     crop up in some calls (see in SCO). */
2493
2494     else if (Ustrcmp(argrest, "o") == 0) {}
2495
2496     /* -oP <name>: set pid file path for daemon */
2497
2498     else if (Ustrcmp(argrest, "P") == 0)
2499       override_pid_file_path = argv[++i];
2500
2501     /* -or <n>: set timeout for non-SMTP acceptance
2502        -os <n>: set timeout for SMTP acceptance */
2503
2504     else if (*argrest == 'r' || *argrest == 's')
2505       {
2506       int *tp = (*argrest == 'r')?
2507         &arg_receive_timeout : &arg_smtp_receive_timeout;
2508       if (argrest[1] == 0)
2509         {
2510         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2511         }
2512       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2513       if (*tp < 0)
2514         {
2515         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2516         exit(EXIT_FAILURE);
2517         }
2518       }
2519
2520     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2521
2522     else if (Ustrcmp(argrest, "X") == 0)
2523       override_local_interfaces = argv[++i];
2524
2525     /* Unknown -o argument */
2526
2527     else badarg = TRUE;
2528     break;
2529
2530
2531     /* -ps: force Perl startup; -pd force delayed Perl startup */
2532
2533     case 'p':
2534     #ifdef EXIM_PERL
2535     if (*argrest == 's' && argrest[1] == 0)
2536       {
2537       perl_start_option = 1;
2538       break;
2539       }
2540     if (*argrest == 'd' && argrest[1] == 0)
2541       {
2542       perl_start_option = -1;
2543       break;
2544       }
2545     #endif
2546
2547     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2548     which sets the host protocol and host name */
2549
2550     if (*argrest == 0)
2551       {
2552       if (i+1 < argc) argrest = argv[++i]; else
2553         { badarg = TRUE; break; }
2554       }
2555
2556     if (*argrest != 0)
2557       {
2558       uschar *hn = Ustrchr(argrest, ':');
2559       if (hn == NULL)
2560         {
2561         received_protocol = argrest;
2562         }
2563       else
2564         {
2565         received_protocol = string_copyn(argrest, hn - argrest);
2566         sender_host_name = hn + 1;
2567         }
2568       }
2569     break;
2570
2571
2572     case 'q':
2573     receiving_message = FALSE;
2574
2575     /* -qq...: Do queue runs in a 2-stage manner */
2576
2577     if (*argrest == 'q')
2578       {
2579       queue_2stage = TRUE;
2580       argrest++;
2581       }
2582
2583     /* -qi...: Do only first (initial) deliveries */
2584
2585     if (*argrest == 'i')
2586       {
2587       queue_run_first_delivery = TRUE;
2588       argrest++;
2589       }
2590
2591     /* -qf...: Run the queue, forcing deliveries
2592        -qff..: Ditto, forcing thawing as well */
2593
2594     if (*argrest == 'f')
2595       {
2596       queue_run_force = TRUE;
2597       if (*(++argrest) == 'f')
2598         {
2599         deliver_force_thaw = TRUE;
2600         argrest++;
2601         }
2602       }
2603
2604     /* -q[f][f]l...: Run the queue only on local deliveries */
2605
2606     if (*argrest == 'l')
2607       {
2608       queue_run_local = TRUE;
2609       argrest++;
2610       }
2611
2612     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2613     optionally starting from a given message id. */
2614
2615     if (*argrest == 0 &&
2616         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2617       {
2618       queue_interval = 0;
2619       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2620         start_queue_run_id = argv[++i];
2621       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2622         stop_queue_run_id = argv[++i];
2623       }
2624
2625     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2626     optionally local only. */
2627
2628     else
2629       {
2630       if (*argrest != 0)
2631         queue_interval = readconf_readtime(argrest, 0, FALSE);
2632       else
2633         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2634       if (queue_interval <= 0)
2635         {
2636         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2637         exit(EXIT_FAILURE);
2638         }
2639       }
2640     break;
2641
2642
2643     case 'R':   /* Synonymous with -qR... */
2644     receiving_message = FALSE;
2645
2646     /* -Rf:   As -R (below) but force all deliveries,
2647        -Rff:  Ditto, but also thaw all frozen messages,
2648        -Rr:   String is regex
2649        -Rrf:  Regex and force
2650        -Rrff: Regex and force and thaw
2651
2652     in all cases provided there are no further characters in this
2653     argument. */
2654
2655     if (*argrest != 0)
2656       {
2657       int i;
2658       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2659         {
2660         if (Ustrcmp(argrest, rsopts[i]) == 0)
2661           {
2662           if (i != 2) queue_run_force = TRUE;
2663           if (i >= 2) deliver_selectstring_regex = TRUE;
2664           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2665           argrest += Ustrlen(rsopts[i]);
2666           }
2667         }
2668       }
2669
2670     /* -R: Set string to match in addresses for forced queue run to
2671     pick out particular messages. */
2672
2673     if (*argrest == 0)
2674       {
2675       if (i+1 < argc) deliver_selectstring = argv[++i]; else
2676         {
2677         fprintf(stderr, "exim: string expected after -R\n");
2678         exit(EXIT_FAILURE);
2679         }
2680       }
2681     else deliver_selectstring = argrest;
2682     if (queue_interval < 0) queue_interval = 0;
2683     break;
2684
2685
2686     /* -r: an obsolete synonym for -f (see above) */
2687
2688
2689     /* -S: Like -R but works on sender. */
2690
2691     case 'S':   /* Synonymous with -qS... */
2692     receiving_message = FALSE;
2693
2694     /* -Sf:   As -S (below) but force all deliveries,
2695        -Sff:  Ditto, but also thaw all frozen messages,
2696        -Sr:   String is regex
2697        -Srf:  Regex and force
2698        -Srff: Regex and force and thaw
2699
2700     in all cases provided there are no further characters in this
2701     argument. */
2702
2703     if (*argrest != 0)
2704       {
2705       int i;
2706       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2707         {
2708         if (Ustrcmp(argrest, rsopts[i]) == 0)
2709           {
2710           if (i != 2) queue_run_force = TRUE;
2711           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2712           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2713           argrest += Ustrlen(rsopts[i]);
2714           }
2715         }
2716       }
2717
2718     /* -S: Set string to match in addresses for forced queue run to
2719     pick out particular messages. */
2720
2721     if (*argrest == 0)
2722       {
2723       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2724         {
2725         fprintf(stderr, "exim: string expected after -S\n");
2726         exit(EXIT_FAILURE);
2727         }
2728       }
2729     else deliver_selectstring_sender = argrest;
2730     if (queue_interval < 0) queue_interval = 0;
2731     break;
2732
2733     /* -Tqt is an option that is exclusively for use by the testing suite.
2734     It is not recognized in other circumstances. It allows for the setting up
2735     of explicit "queue times" so that various warning/retry things can be
2736     tested. Otherwise variability of clock ticks etc. cause problems. */
2737
2738     case 'T':
2739     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2740       fudged_queue_times = argv[++i];
2741     else badarg = TRUE;
2742     break;
2743
2744
2745     /* -t: Set flag to extract recipients from body of message. */
2746
2747     case 't':
2748     if (*argrest == 0) extract_recipients = TRUE;
2749
2750     /* -ti: Set flag to extract recipients from body of message, and also
2751     specify that dot does not end the message. */
2752
2753     else if (Ustrcmp(argrest, "i") == 0)
2754       {
2755       extract_recipients = TRUE;
2756       dot_ends = FALSE;
2757       }
2758
2759     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2760
2761     #ifdef SUPPORT_TLS
2762     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2763     #endif
2764
2765     else badarg = TRUE;
2766     break;
2767
2768
2769     /* -U: This means "initial user submission" in sendmail, apparently. The
2770     doc claims that in future sendmail may refuse syntactically invalid
2771     messages instead of fixing them. For the moment, we just ignore it. */
2772
2773     case 'U':
2774     break;
2775
2776
2777     /* -v: verify things - this is a very low-level debugging */
2778
2779     case 'v':
2780     if (*argrest == 0)
2781       {
2782       debug_selector |= D_v;
2783       debug_file = stderr;
2784       }
2785     else badarg = TRUE;
2786     break;
2787
2788
2789     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2790
2791       The -x flag tells the sendmail command that mail from a local
2792       mail program has National Language Support (NLS) extended characters
2793       in the body of the mail item. The sendmail command can send mail with
2794       extended NLS characters across networks that normally corrupts these
2795       8-bit characters.
2796
2797     As Exim is 8-bit clean, it just ignores this flag. */
2798
2799     case 'x':
2800     if (*argrest != 0) badarg = TRUE;
2801     break;
2802
2803     /* All other initial characters are errors */
2804
2805     default:
2806     badarg = TRUE;
2807     break;
2808     }         /* End of high-level switch statement */
2809
2810   /* Failed to recognize the option, or syntax error */
2811
2812   if (badarg)
2813     {
2814     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2815       "option %s\n", arg);
2816     exit(EXIT_FAILURE);
2817     }
2818   }
2819
2820
2821 /* Arguments have been processed. Check for incompatibilities. */
2822
2823 END_ARG:
2824 if ((
2825     (smtp_input || extract_recipients || recipients_arg < argc) &&
2826     (daemon_listen || queue_interval >= 0 || bi_option ||
2827       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2828       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2829     ) ||
2830     (
2831     msg_action_arg > 0 &&
2832     (daemon_listen || queue_interval >= 0 || list_options || checking ||
2833      bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2834     ) ||
2835     (
2836     (daemon_listen || queue_interval >= 0) &&
2837     (sender_address != NULL || list_options || list_queue || checking ||
2838      bi_option)
2839     ) ||
2840     (
2841     daemon_listen && queue_interval == 0
2842     ) ||
2843     (
2844     list_options &&
2845     (checking || smtp_input || extract_recipients ||
2846       filter_test != FTEST_NONE || bi_option)
2847     ) ||
2848     (
2849     verify_address_mode &&
2850     (address_test_mode || smtp_input || extract_recipients ||
2851       filter_test != FTEST_NONE || bi_option)
2852     ) ||
2853     (
2854     address_test_mode && (smtp_input || extract_recipients ||
2855       filter_test != FTEST_NONE || bi_option)
2856     ) ||
2857     (
2858     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2859       extract_recipients)
2860     ) ||
2861     (
2862     deliver_selectstring != NULL && queue_interval < 0
2863     )
2864    )
2865   {
2866   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2867   exit(EXIT_FAILURE);
2868   }
2869
2870 /* If debugging is set up, set the file and the file descriptor to pass on to
2871 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2872 to run in the foreground. */
2873
2874 if (debug_selector != 0)
2875   {
2876   debug_file = stderr;
2877   debug_fd = fileno(debug_file);
2878   background_daemon = FALSE;
2879   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
2880   if (debug_selector != D_v)    /* -v only doesn't show this */
2881     {
2882     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2883       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2884       debug_selector);
2885     show_whats_supported(stderr);
2886     }
2887   }
2888
2889 /* When started with root privilege, ensure that the limits on the number of
2890 open files and the number of processes (where that is accessible) are
2891 sufficiently large, or are unset, in case Exim has been called from an
2892 environment where the limits are screwed down. Not all OS have the ability to
2893 change some of these limits. */
2894
2895 if (unprivileged)
2896   {
2897   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2898   }
2899 else
2900   {
2901   struct rlimit rlp;
2902
2903   #ifdef RLIMIT_NOFILE
2904   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2905     {
2906     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2907       strerror(errno));
2908     rlp.rlim_cur = rlp.rlim_max = 0;
2909     }
2910
2911   /* I originally chose 1000 as a nice big number that was unlikely to
2912   be exceeded. It turns out that some older OS have a fixed upper limit of
2913   256. */
2914
2915   if (rlp.rlim_cur < 1000)
2916     {
2917     rlp.rlim_cur = rlp.rlim_max = 1000;
2918     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2919       {
2920       rlp.rlim_cur = rlp.rlim_max = 256;
2921       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2922         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2923           strerror(errno));
2924       }
2925     }
2926   #endif
2927
2928   #ifdef RLIMIT_NPROC
2929   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2930     {
2931     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2932       strerror(errno));
2933     rlp.rlim_cur = rlp.rlim_max = 0;
2934     }
2935
2936   #ifdef RLIM_INFINITY
2937   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2938     {
2939     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2940   #else
2941   if (rlp.rlim_cur < 1000)
2942     {
2943     rlp.rlim_cur = rlp.rlim_max = 1000;
2944   #endif
2945     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2946       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2947         strerror(errno));
2948     }
2949   #endif
2950   }
2951
2952 /* Exim is normally entered as root (but some special configurations are
2953 possible that don't do this). However, it always spins off sub-processes that
2954 set their uid and gid as required for local delivery. We don't want to pass on
2955 any extra groups that root may belong to, so we want to get rid of them all at
2956 this point.
2957
2958 We need to obey setgroups() at this stage, before possibly giving up root
2959 privilege for a changed configuration file, but later on we might need to
2960 check on the additional groups for the admin user privilege - can't do that
2961 till after reading the config, which might specify the exim gid. Therefore,
2962 save the group list here first. */
2963
2964 group_count = getgroups(NGROUPS_MAX, group_list);
2965
2966 /* There is a fundamental difference in some BSD systems in the matter of
2967 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2968 known not to be different. On the "different" systems there is a single group
2969 list, and the first entry in it is the current group. On all other versions of
2970 Unix there is a supplementary group list, which is in *addition* to the current
2971 group. Consequently, to get rid of all extraneous groups on a "standard" system
2972 you pass over 0 groups to setgroups(), while on a "different" system you pass
2973 over a single group - the current group, which is always the first group in the
2974 list. Calling setgroups() with zero groups on a "different" system results in
2975 an error return. The following code should cope with both types of system.
2976
2977 However, if this process isn't running as root, setgroups() can't be used
2978 since you have to be root to run it, even if throwing away groups. Not being
2979 root here happens only in some unusual configurations. We just ignore the
2980 error. */
2981
2982 if (setgroups(0, NULL) != 0)
2983   {
2984   if (setgroups(1, group_list) != 0 && !unprivileged)
2985     {
2986     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2987     exit(EXIT_FAILURE);
2988     }
2989   }
2990
2991 /* If the configuration file name has been altered by an argument on the
2992 command line (either a new file name or a macro definition) and the caller is
2993 not root or the exim user, or if this is a filter testing run, remove any
2994 setuid privilege the program has, and run as the underlying user.
2995
2996 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2997 severely restricts the use of -C for some purposes.
2998
2999 Otherwise, set the real ids to the effective values (should be root unless run
3000 from inetd, which it can either be root or the exim uid, if one is configured).
3001
3002 There is a private mechanism for bypassing some of this, in order to make it
3003 possible to test lots of configurations automatically, without having either to
3004 recompile each time, or to patch in an actual configuration file name and other
3005 values (such as the path name). If running in the test harness, pretend that
3006 configuration file changes and macro definitions haven't happened. */
3007
3008 if ((                                            /* EITHER */
3009     (config_changed || macros != NULL) &&        /* Config changed, and */
3010     real_uid != root_uid &&                      /* Not root, and */
3011     #ifndef ALT_CONFIG_ROOT_ONLY                 /* (when not locked out) */
3012     real_uid != exim_uid &&                      /* Not exim, and */
3013     #endif
3014     !running_in_test_harness                     /* Not fudged */
3015     ) ||                                         /*   OR   */
3016     expansion_test                               /* expansion testing */
3017     ||                                           /*   OR   */
3018     filter_test != FTEST_NONE)                   /* Filter testing */
3019   {
3020   setgroups(group_count, group_list);
3021   exim_setugid(real_uid, real_gid, FALSE,
3022     US"-C, -D, -be or -bf forces real uid");
3023   removed_privilege = TRUE;
3024
3025   /* In the normal case when Exim is called like this, stderr is available
3026   and should be used for any logging information because attempts to write
3027   to the log will usually fail. To arrange this, we unset really_exim. However,
3028   if no stderr is available there is no point - we might as well have a go
3029   at the log (if it fails, syslog will be written). */
3030
3031   if (log_stderr != NULL) really_exim = FALSE;
3032   }
3033
3034 /* Privilege is to be retained for the moment. It may be dropped later,
3035 depending on the job that this Exim process has been asked to do. For now, set
3036 the real uid to the effective so that subsequent re-execs of Exim are done by a
3037 privileged user. */
3038
3039 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3040
3041 /* If testing a filter, open the file(s) now, before wasting time doing other
3042 setups and reading the message. */
3043
3044 if ((filter_test & FTEST_SYSTEM) != 0)
3045   {
3046   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3047   if (filter_sfd < 0)
3048     {
3049     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3050       strerror(errno));
3051     return EXIT_FAILURE;
3052     }
3053   }
3054
3055 if ((filter_test & FTEST_USER) != 0)
3056   {
3057   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3058   if (filter_ufd < 0)
3059     {
3060     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3061       strerror(errno));
3062     return EXIT_FAILURE;
3063     }
3064   }
3065
3066 /* Read the main runtime configuration data; this gives up if there
3067 is a failure. It leaves the configuration file open so that the subsequent
3068 configuration data for delivery can be read if needed. */
3069
3070 readconf_main();
3071
3072 /* Handle the decoding of logging options. */
3073
3074 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3075   log_options, log_options_count, US"log");
3076
3077 DEBUG(D_any)
3078   {
3079   debug_printf("configuration file is %s\n", config_main_filename);
3080   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3081     log_extra_selector);
3082   }
3083
3084 /* If domain literals are not allowed, check the sender address that was
3085 supplied with -f. Ditto for a stripped trailing dot. */
3086
3087 if (sender_address != NULL)
3088   {
3089   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3090     {
3091     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3092       "allowed\n", sender_address);
3093     return EXIT_FAILURE;
3094     }
3095   if (f_end_dot && !strip_trailing_dot)
3096     {
3097     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3098       "(trailing dot not allowed)\n", sender_address);
3099     return EXIT_FAILURE;
3100     }
3101   }
3102
3103 /* Paranoia check of maximum lengths of certain strings. There is a check
3104 on the length of the log file path in log.c, which will come into effect
3105 if there are any calls to write the log earlier than this. However, if we
3106 get this far but the string is very long, it is better to stop now than to
3107 carry on and (e.g.) receive a message and then have to collapse. The call to
3108 log_write() from here will cause the ultimate panic collapse if the complete
3109 file name exceeds the buffer length. */
3110
3111 if (Ustrlen(log_file_path) > 200)
3112   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3113     "log_file_path is longer than 200 chars: aborting");
3114
3115 if (Ustrlen(pid_file_path) > 200)
3116   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3117     "pid_file_path is longer than 200 chars: aborting");
3118
3119 if (Ustrlen(spool_directory) > 200)
3120   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3121     "spool_directory is longer than 200 chars: aborting");
3122
3123 /* Length check on the process name given to syslog for its TAG field,
3124 which is only permitted to be 32 characters or less. See RFC 3164. */
3125
3126 if (Ustrlen(syslog_processname) > 32)
3127   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3128     "syslog_processname is longer than 32 chars: aborting");
3129
3130 /* In some operating systems, the environment variable TMPDIR controls where
3131 temporary files are created; Exim doesn't use these (apart from when delivering
3132 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3133 If TMPDIR is found in the environment, reset it to the value defined in the
3134 TMPDIR macro, if this macro is defined. */
3135
3136 #ifdef TMPDIR
3137   {
3138   uschar **p;
3139   for (p = USS environ; *p != NULL; p++)
3140     {
3141     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3142         Ustrcmp(*p+7, TMPDIR) != 0)
3143       {
3144       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3145       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3146       *p = newp;
3147       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3148       }
3149     }
3150   }
3151 #endif
3152
3153 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3154 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3155 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3156 called by a user who has set the TZ variable. This then affects the timestamps
3157 in log files and in Received: headers, and any created Date: header lines. The
3158 required timezone is settable in the configuration file, so nothing can be done
3159 about this earlier - but hopefully nothing will normally be logged earlier than
3160 this. We have to make a new environment if TZ is wrong, but don't bother if
3161 timestamps_utc is set, because then all times are in UTC anyway. */
3162
3163 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3164   {
3165   timestamps_utc = TRUE;
3166   }
3167 else
3168   {
3169   uschar *envtz = US getenv("TZ");
3170   if ((envtz == NULL && timezone_string != NULL) ||
3171       (envtz != NULL &&
3172         (timezone_string == NULL ||
3173          Ustrcmp(timezone_string, envtz) != 0)))
3174     {
3175     uschar **p = USS environ;
3176     uschar **new;
3177     uschar **newp;
3178     int count = 0;
3179     while (*p++ != NULL) count++;
3180     if (envtz == NULL) count++;
3181     newp = new = malloc(sizeof(uschar *) * (count + 1));
3182     for (p = USS environ; *p != NULL; p++)
3183       {
3184       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3185       *newp++ = *p;
3186       }
3187     if (timezone_string != NULL)
3188       {
3189       *newp = malloc(Ustrlen(timezone_string) + 4);
3190       sprintf(CS *newp++, "TZ=%s", timezone_string);
3191       }
3192     *newp = NULL;
3193     environ = CSS new;
3194     tzset();
3195     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3196       tod_stamp(tod_log));
3197     }
3198   }
3199
3200 /* Handle the case when we have removed the setuid privilege because of -C or
3201 -D. This means that the caller of Exim was not root, and, provided that
3202 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3203 the binary.
3204
3205 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3206 were running as the exim user defined in the configuration file (different to
3207 the one in the binary). The sysadmin may expect this case to retain privilege
3208 because "the binary was called by the Exim user", but it hasn't, because of the
3209 order in which it handles this stuff. There are two possibilities:
3210
3211   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3212       to do message deliveries. Thus, the fact that it is running as a
3213       non-privileged user is plausible, and might be wanted in some special
3214       configurations. However, really_exim will have been set false when
3215       privilege was dropped, to stop Exim trying to write to its normal log
3216       files. Therefore, re-enable normal log processing, assuming the sysadmin
3217       has set up the log directory correctly.
3218
3219   (2) If deliver_drop_privilege is not set, the configuration won't work as
3220       apparently intended, and so we log a panic message. In order to retain
3221       root for -C or -D, the caller must either be root or the Exim user
3222       defined in the binary (when deliver_drop_ privilege is false).
3223
3224 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3225 built-in exim user or one defined in the configuration. In either event,
3226 re-enable log processing, assuming the sysadmin knows what they are doing. */
3227
3228 if (removed_privilege && (config_changed || macros != NULL) &&
3229     real_uid == exim_uid)
3230   {
3231   #ifdef ALT_CONFIG_ROOT_ONLY
3232   really_exim = TRUE;   /* let logging work normally */
3233   #else
3234
3235   if (deliver_drop_privilege)
3236     really_exim = TRUE; /* let logging work normally */
3237   else
3238     log_write(0, LOG_MAIN|LOG_PANIC,
3239       "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3240       (int)exim_uid, config_changed? "-C" : "-D");
3241   #endif
3242   }
3243
3244 /* Start up Perl interpreter if Perl support is configured and there is a
3245 perl_startup option, and the configuration or the command line specifies
3246 initializing starting. Note that the global variables are actually called
3247 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3248
3249 #ifdef EXIM_PERL
3250 if (perl_start_option != 0)
3251   opt_perl_at_start = (perl_start_option > 0);
3252 if (opt_perl_at_start && opt_perl_startup != NULL)
3253   {
3254   uschar *errstr;
3255   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3256   errstr = init_perl(opt_perl_startup);
3257   if (errstr != NULL)
3258     {
3259     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3260     return EXIT_FAILURE;
3261     }
3262   opt_perl_started = TRUE;
3263   }
3264 #endif /* EXIM_PERL */
3265
3266 /* Log the arguments of the call if the configuration file said so. This is
3267 a debugging feature for finding out what arguments certain MUAs actually use.
3268 Don't attempt it if logging is disabled, or if listing variables or if
3269 verifying/testing addresses or expansions. */
3270
3271 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3272       && really_exim && !list_options && !checking)
3273   {
3274   int i;
3275   uschar *p = big_buffer;
3276   Ustrcpy(p, "cwd=");
3277   (void)getcwd(CS p+4, big_buffer_size - 4);
3278   while (*p) p++;
3279   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3280   while (*p) p++;
3281   for (i = 0; i < argc; i++)
3282     {
3283     int len = Ustrlen(argv[i]);
3284     uschar *printing;
3285     uschar *quote;
3286     if (p + len + 8 >= big_buffer + big_buffer_size)
3287       {
3288       Ustrcpy(p, " ...");
3289       log_write(0, LOG_MAIN, "%s", big_buffer);
3290       Ustrcpy(big_buffer, "...");
3291       p = big_buffer + 3;
3292       }
3293     printing = string_printing(argv[i]);
3294     if (printing[0] == 0) quote = US"\""; else
3295       {
3296       uschar *pp = printing;
3297       quote = US"";
3298       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3299       }
3300     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3301       (p - big_buffer) - 4), printing, quote);
3302     while (*p) p++;
3303     }
3304
3305   if ((log_extra_selector & LX_arguments) != 0)
3306     log_write(0, LOG_MAIN, "%s", big_buffer);
3307   else
3308     debug_printf("%s\n", big_buffer);
3309   }
3310
3311 /* Set the working directory to be the top-level spool directory. We don't rely
3312 on this in the code, which always uses fully qualified names, but it's useful
3313 for core dumps etc. Don't complain if it fails - the spool directory might not
3314 be generally accessible and calls with the -C option (and others) have lost
3315 privilege by now. Before the chdir, we try to ensure that the directory exists.
3316 */
3317
3318 if (Uchdir(spool_directory) != 0)
3319   {
3320   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3321   (void)Uchdir(spool_directory);
3322   }
3323
3324 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3325 alias file. Exim doesn't have such a concept, but this call is screwed into
3326 Sun's YP makefiles. Handle this by calling a configured script, as the real
3327 user who called Exim. The -oA option can be used to pass an argument to the
3328 script. */
3329
3330 if (bi_option)
3331   {
3332   (void)fclose(config_file);
3333   if (bi_command != NULL)
3334     {
3335     int i = 0;
3336     uschar *argv[3];
3337     argv[i++] = bi_command;
3338     if (alias_arg != NULL) argv[i++] = alias_arg;
3339     argv[i++] = NULL;
3340
3341     setgroups(group_count, group_list);
3342     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3343
3344     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3345       (argv[1] == NULL)? US"" : argv[1]);
3346
3347     execv(CS argv[0], (char *const *)argv);
3348     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3349     exit(EXIT_FAILURE);
3350     }
3351   else
3352     {
3353     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3354     exit(EXIT_SUCCESS);
3355     }
3356   }
3357
3358 /* If an action on specific messages is requested, or if a daemon or queue
3359 runner is being started, we need to know if Exim was called by an admin user.
3360 This is the case if the real user is root or exim, or if the real group is
3361 exim, or if one of the supplementary groups is exim or a group listed in
3362 admin_groups. We don't fail all message actions immediately if not admin_user,
3363 since some actions can be performed by non-admin users. Instead, set admin_user
3364 for later interrogation. */
3365
3366 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3367   admin_user = TRUE;
3368 else
3369   {
3370   int i, j;
3371
3372   for (i = 0; i < group_count; i++)
3373     {
3374     if (group_list[i] == exim_gid) admin_user = TRUE;
3375     else if (admin_groups != NULL)
3376       {
3377       for (j = 1; j <= (int)(admin_groups[0]); j++)
3378         if (admin_groups[j] == group_list[i])
3379           { admin_user = TRUE; break; }
3380       }
3381     if (admin_user) break;
3382     }
3383   }
3384
3385 /* Another group of privileged users are the trusted users. These are root,
3386 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3387 are permitted to specify sender_addresses with -f on the command line, and
3388 other message parameters as well. */
3389
3390 if (real_uid == root_uid || real_uid == exim_uid)
3391   trusted_caller = TRUE;
3392 else
3393   {
3394   int i, j;
3395
3396   if (trusted_users != NULL)
3397     {
3398     for (i = 1; i <= (int)(trusted_users[0]); i++)
3399       if (trusted_users[i] == real_uid)
3400         { trusted_caller = TRUE; break; }
3401     }
3402
3403   if (!trusted_caller && trusted_groups != NULL)
3404     {
3405     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3406       {
3407       if (trusted_groups[i] == real_gid)
3408         trusted_caller = TRUE;
3409       else for (j = 0; j < group_count; j++)
3410         {
3411         if (trusted_groups[i] == group_list[j])
3412           { trusted_caller = TRUE; break; }
3413         }
3414       if (trusted_caller) break;
3415       }
3416     }
3417   }
3418
3419 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3420 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3421
3422 /* Only an admin user may start the daemon or force a queue run in the default
3423 configuration, but the queue run restriction can be relaxed. Only an admin
3424 user may request that a message be returned to its sender forthwith. Only an
3425 admin user may specify a debug level greater than D_v (because it might show
3426 passwords, etc. in lookup queries). Only an admin user may request a queue
3427 count. */
3428
3429 if (!admin_user)
3430   {
3431   BOOL debugset = (debug_selector & ~D_v) != 0;
3432   if (deliver_give_up || daemon_listen ||
3433      (count_queue && queue_list_requires_admin) ||
3434      (list_queue && queue_list_requires_admin) ||
3435      (queue_interval >= 0 && prod_requires_admin) ||
3436      (debugset && !running_in_test_harness))
3437     {
3438     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3439     exit(EXIT_FAILURE);
3440     }
3441   }
3442
3443 /* If the real user is not root or the exim uid, the argument for passing
3444 in an open TCP/IP connection for another message is not permitted, nor is
3445 running with the -N option for any delivery action, unless this call to exim is
3446 one that supplied an input message, or we are using a patched exim for
3447 regression testing. */
3448
3449 if (real_uid != root_uid && real_uid != exim_uid &&
3450      (continue_hostname != NULL ||
3451        (dont_deliver &&
3452          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3453        )) && !running_in_test_harness)
3454   {
3455   fprintf(stderr, "exim: Permission denied\n");
3456   return EXIT_FAILURE;
3457   }
3458
3459 /* If the caller is not trusted, certain arguments are ignored when running for
3460 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3461 Note that authority for performing certain actions on messages is tested in the
3462 queue_action() function. */
3463
3464 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3465   {
3466   sender_host_name = sender_host_address = interface_address =
3467     sender_ident = received_protocol = NULL;
3468   sender_host_port = interface_port = 0;
3469   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3470   }
3471
3472 /* If a sender host address is set, extract the optional port number off the
3473 end of it and check its syntax. Do the same thing for the interface address.
3474 Exim exits if the syntax is bad. */
3475
3476 else
3477   {
3478   if (sender_host_address != NULL)
3479     sender_host_port = check_port(sender_host_address);
3480   if (interface_address != NULL)
3481     interface_port = check_port(interface_address);
3482   }
3483
3484 /* If an SMTP message is being received check to see if the standard input is a
3485 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3486 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3487 barf. */
3488
3489 if (smtp_input)
3490   {
3491   union sockaddr_46 inetd_sock;
3492   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3493   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3494     {
3495     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3496     if (family == AF_INET || family == AF_INET6)
3497       {
3498       union sockaddr_46 interface_sock;
3499       size = sizeof(interface_sock);
3500
3501       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3502         interface_address = host_ntoa(-1, &interface_sock, NULL,
3503           &interface_port);
3504
3505       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3506
3507       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3508         {
3509         is_inetd = TRUE;
3510         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3511           NULL, &sender_host_port);
3512         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3513           "inetd is not supported when mua_wrapper is set");
3514         }
3515       else
3516         {
3517         fprintf(stderr,
3518           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3519         return EXIT_FAILURE;
3520         }
3521       }
3522     }
3523   }
3524
3525 /* If the load average is going to be needed while receiving a message, get it
3526 now for those OS that require the first call to os_getloadavg() to be done as
3527 root. There will be further calls later for each message received. */
3528
3529 #ifdef LOAD_AVG_NEEDS_ROOT
3530 if (receiving_message &&
3531       (queue_only_load >= 0 ||
3532         (is_inetd && smtp_load_reserve >= 0)
3533       ))
3534   {
3535   load_average = os_getloadavg();
3536   }
3537 #endif
3538
3539 /* The queue_only configuration option can be overridden by -odx on the command
3540 line, except that if queue_only_override is false, queue_only cannot be unset
3541 from the command line. */
3542
3543 if (queue_only_set && (queue_only_override || arg_queue_only))
3544   queue_only = arg_queue_only;
3545
3546 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3547 -or and -os. */
3548
3549 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3550 if (arg_smtp_receive_timeout >= 0)
3551   smtp_receive_timeout = arg_smtp_receive_timeout;
3552
3553 /* If Exim was started with root privilege, unless we have already removed the
3554 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3555 except when starting the daemon or doing some kind of delivery or address
3556 testing (-bt). These are the only cases when root need to be retained. We run
3557 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3558 retained only for starting the daemon. */
3559
3560 if (!unprivileged &&                      /* originally had root AND */
3561     !removed_privilege &&                 /* still got root AND      */
3562     !daemon_listen &&                     /* not starting the daemon */
3563     queue_interval <= 0 &&                /* (either kind of daemon) */
3564       (                                   /*    AND EITHER           */
3565       deliver_drop_privilege ||           /* requested unprivileged  */
3566         (                                 /*       OR                */
3567         queue_interval < 0 &&             /* not running the queue   */
3568         (msg_action_arg < 0 ||            /*       and               */
3569           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3570         (!checking || !address_test_mode) /* not address checking    */
3571         )
3572       ))
3573   {
3574   exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3575   }
3576
3577 /* When we are retaining a privileged uid, we still change to the exim gid. */
3578
3579 else setgid(exim_gid);
3580
3581 /* Handle a request to list the delivery queue */
3582
3583 if (list_queue)
3584   {
3585   set_process_info("listing the queue");
3586   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3587   exit(EXIT_SUCCESS);
3588   }
3589
3590 /* Handle a request to count the delivery queue */
3591
3592 if (count_queue)
3593   {
3594   set_process_info("counting the queue");
3595   queue_count();
3596   exit(EXIT_SUCCESS);
3597   }
3598
3599 /* Handle actions on specific messages, except for the force delivery action,
3600 which is done below. Some actions take a whole list of message ids, which
3601 are known to continue up to the end of the arguments. Others take a single
3602 message id and then operate on the recipients list. */
3603
3604 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3605   {
3606   int yield = EXIT_SUCCESS;
3607   set_process_info("acting on specified messages");
3608
3609   if (!one_msg_action)
3610     {
3611     for (i = msg_action_arg; i < argc; i++)
3612       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3613         yield = EXIT_FAILURE;
3614     }
3615
3616   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3617     recipients_arg)) yield = EXIT_FAILURE;
3618   exit(yield);
3619   }
3620
3621 /* All the modes below here require the remaining configuration sections
3622 to be read, except that we can skip over the ACL setting when delivering
3623 specific messages, or doing a queue run. (For various testing cases we could
3624 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3625 for skipping. */
3626
3627 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3628
3629 /* The configuration data will have been read into POOL_PERM because we won't
3630 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3631 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3632 configuration were read into POOL_MAIN, because we don't do any resets till
3633 later on. However, it seems right, and it does ensure that both pools get used.
3634 */
3635
3636 store_pool = POOL_MAIN;
3637
3638 /* Handle the -brt option. This is for checking out retry configurations.
3639 The next three arguments are a domain name or a complete address, and
3640 optionally two error numbers. All it does is to call the function that
3641 scans the retry configuration data. */
3642
3643 if (test_retry_arg >= 0)
3644   {
3645   retry_config *yield;
3646   int basic_errno = 0;
3647   int more_errno = 0;
3648   uschar *s1, *s2;
3649
3650   if (test_retry_arg >= argc)
3651     {
3652     printf("-brt needs a domain or address argument\n");
3653     exim_exit(EXIT_FAILURE);
3654     }
3655   s1 = argv[test_retry_arg++];
3656   s2 = NULL;
3657
3658   /* If the first argument contains no @ and no . it might be a local user
3659   or it might be a single-component name. Treat as a domain. */
3660
3661   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3662     {
3663     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3664       "being \ntreated as a one-component domain, not as a local part.\n\n",
3665       s1);
3666     }
3667
3668   /* There may be an optional second domain arg. */
3669
3670   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3671     s2 = argv[test_retry_arg++];
3672
3673   /* The final arg is an error name */
3674
3675   if (test_retry_arg < argc)
3676     {
3677     uschar *ss = argv[test_retry_arg];
3678     uschar *error =
3679       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3680     if (error != NULL)
3681       {
3682       printf("%s\n", CS error);
3683       return EXIT_FAILURE;
3684       }
3685
3686     /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3687     an error is for matching codes to the decade. Turn them into a real error
3688     code, off the decade. */
3689
3690     if (basic_errno == ERRNO_RCPT4XX)
3691       {
3692       int code = (more_errno >> 8) & 255;
3693       if (code == 255)
3694         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3695       else if (code > 100)
3696         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3697       }
3698     }
3699
3700   yield = retry_find_config(s1, s2, basic_errno, more_errno);
3701   if (yield == NULL) printf("No retry information found\n"); else
3702     {
3703     retry_rule *r;
3704     more_errno = yield->more_errno;
3705     printf("Retry rule: %s  ", yield->pattern);
3706
3707     if (yield->basic_errno == ERRNO_EXIMQUOTA)
3708       {
3709       printf("quota%s%s  ",
3710         (more_errno > 0)? "_" : "",
3711         (more_errno > 0)? readconf_printtime(more_errno) : US"");
3712       }
3713     else if (yield->basic_errno == ECONNREFUSED)
3714       {
3715       printf("refused%s%s  ",
3716         (more_errno > 0)? "_" : "",
3717         (more_errno == 'M')? "MX" :
3718         (more_errno == 'A')? "A" : "");
3719       }
3720     else if (yield->basic_errno == ETIMEDOUT)
3721       {
3722       printf("timeout");
3723       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3724       more_errno &= 255;
3725       if (more_errno != 0) printf("_%s",
3726         (more_errno == 'M')? "MX" : "A");
3727       printf("  ");
3728       }
3729     else if (yield->basic_errno == ERRNO_AUTHFAIL)
3730       printf("auth_failed  ");
3731     else printf("*  ");
3732
3733     for (r = yield->rules; r != NULL; r = r->next)
3734       {
3735       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3736       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
3737       if (r->rule == 'G')
3738         {
3739         int x = r->p2;
3740         int f = x % 1000;
3741         int d = 100;
3742         printf(",%d.", x/1000);
3743         do
3744           {
3745           printf("%d", f/d);
3746           f %= d;
3747           d /= 10;
3748           }
3749         while (f != 0);
3750         }
3751       printf("; ");
3752       }
3753
3754     printf("\n");
3755     }
3756   exim_exit(EXIT_SUCCESS);
3757   }
3758
3759 /* Handle a request to list one or more configuration options */
3760
3761 if (list_options)
3762   {
3763   set_process_info("listing variables");
3764   if (recipients_arg >= argc) readconf_print(US"all", NULL);
3765     else for (i = recipients_arg; i < argc; i++)
3766       {
3767       if (i < argc - 1 &&
3768           (Ustrcmp(argv[i], "router") == 0 ||
3769            Ustrcmp(argv[i], "transport") == 0 ||
3770            Ustrcmp(argv[i], "authenticator") == 0))
3771         {
3772         readconf_print(argv[i+1], argv[i]);
3773         i++;
3774         }
3775       else readconf_print(argv[i], NULL);
3776       }
3777   exim_exit(EXIT_SUCCESS);
3778   }
3779
3780
3781 /* Handle a request to deliver one or more messages that are already on the
3782 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3783 is typically used for a small number when prodding by hand (when the option
3784 forced_delivery will be set) or when re-execing to regain root privilege.
3785 Each message delivery must happen in a separate process, so we fork a process
3786 for each one, and run them sequentially so that debugging output doesn't get
3787 intertwined, and to avoid spawning too many processes if a long list is given.
3788 However, don't fork for the last one; this saves a process in the common case
3789 when Exim is called to deliver just one message. */
3790
3791 if (msg_action_arg > 0)
3792   {
3793   if (prod_requires_admin && !admin_user)
3794     {
3795     fprintf(stderr, "exim: Permission denied\n");
3796     exim_exit(EXIT_FAILURE);
3797     }
3798   set_process_info("delivering specified messages");
3799   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3800   for (i = msg_action_arg; i < argc; i++)
3801     {
3802     int status;
3803     pid_t pid;
3804     if (i == argc - 1)
3805       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3806     else if ((pid = fork()) == 0)
3807       {
3808       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3809       _exit(EXIT_SUCCESS);
3810       }
3811     else if (pid < 0)
3812       {
3813       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3814         strerror(errno));
3815       exim_exit(EXIT_FAILURE);
3816       }
3817     else wait(&status);
3818     }
3819   exim_exit(EXIT_SUCCESS);
3820   }
3821
3822
3823 /* If only a single queue run is requested, without SMTP listening, we can just
3824 turn into a queue runner, with an optional starting message id. */
3825
3826 if (queue_interval == 0 && !daemon_listen)
3827   {
3828   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3829     (start_queue_run_id == NULL)? US"" : US" starting at ",
3830     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3831     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
3832     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
3833   set_process_info("running the queue (single queue run)");
3834   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3835   exim_exit(EXIT_SUCCESS);
3836   }
3837
3838
3839 /* Find the login name of the real user running this process. This is always
3840 needed when receiving a message, because it is written into the spool file. It
3841 may also be used to construct a from: or a sender: header, and in this case we
3842 need the user's full name as well, so save a copy of it, checked for RFC822
3843 syntax and munged if necessary, if it hasn't previously been set by the -F
3844 argument. We may try to get the passwd entry more than once, in case NIS or
3845 other delays are in evidence. Save the home directory for use in filter testing
3846 (only). */
3847
3848 for (i = 0;;)
3849   {
3850   if ((pw = getpwuid(real_uid)) != NULL)
3851     {
3852     originator_login = string_copy(US pw->pw_name);
3853     originator_home = string_copy(US pw->pw_dir);
3854
3855     /* If user name has not been set by -F, set it from the passwd entry
3856     unless -f has been used to set the sender address by a trusted user. */
3857
3858     if (originator_name == NULL)
3859       {
3860       if (sender_address == NULL ||
3861            (!trusted_caller && filter_test == FTEST_NONE))
3862         {
3863         uschar *name = US pw->pw_gecos;
3864         uschar *amp = Ustrchr(name, '&');
3865         uschar buffer[256];
3866
3867         /* Most Unix specify that a '&' character in the gecos field is
3868         replaced by a copy of the login name, and some even specify that
3869         the first character should be upper cased, so that's what we do. */
3870
3871         if (amp != NULL)
3872           {
3873           int loffset;
3874           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3875             amp - name, name, &loffset, originator_login, amp + 1);
3876           buffer[loffset] = toupper(buffer[loffset]);
3877           name = buffer;
3878           }
3879
3880         /* If a pattern for matching the gecos field was supplied, apply
3881         it and then expand the name string. */
3882
3883         if (gecos_pattern != NULL && gecos_name != NULL)
3884           {
3885           const pcre *re;
3886           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3887
3888           if (regex_match_and_setup(re, name, 0, -1))
3889             {
3890             uschar *new_name = expand_string(gecos_name);
3891             expand_nmax = -1;
3892             if (new_name != NULL)
3893               {
3894               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3895                 "gecos field \"%s\"\n", new_name, name);
3896               name = new_name;
3897               }
3898             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3899               "\"%s\": %s\n", gecos_name, expand_string_message);
3900             }
3901           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3902             "gecos field \"%s\"\n", gecos_pattern, name);
3903           store_free((void *)re);
3904           }
3905         originator_name = string_copy(name);
3906         }
3907
3908       /* A trusted caller has used -f but not -F */
3909
3910       else originator_name = US"";
3911       }
3912
3913     /* Break the retry loop */
3914
3915     break;
3916     }
3917
3918   if (++i > finduser_retries) break;
3919   sleep(1);
3920   }
3921
3922 /* If we cannot get a user login, log the incident and give up, unless the
3923 configuration specifies something to use. When running in the test harness,
3924 any setting of unknown_login overrides the actual name. */
3925
3926 if (originator_login == NULL || running_in_test_harness)
3927   {
3928   if (unknown_login != NULL)
3929     {
3930     originator_login = expand_string(unknown_login);
3931     if (originator_name == NULL && unknown_username != NULL)
3932       originator_name = expand_string(unknown_username);
3933     if (originator_name == NULL) originator_name = US"";
3934     }
3935   if (originator_login == NULL)
3936     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3937       (int)real_uid);
3938   }
3939
3940 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3941 RFC822 address.*/
3942
3943 originator_name = string_copy(parse_fix_phrase(originator_name,
3944   Ustrlen(originator_name), big_buffer, big_buffer_size));
3945
3946 /* If a message is created by this call of Exim, the uid/gid of its originator
3947 are those of the caller. These values are overridden if an existing message is
3948 read in from the spool. */
3949
3950 originator_uid = real_uid;
3951 originator_gid = real_gid;
3952
3953 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3954   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3955
3956 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3957 returns. We leave this till here so that the originator_ fields are available
3958 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3959 mode. */
3960
3961 if (daemon_listen || queue_interval > 0)
3962   {
3963   if (mua_wrapper)
3964     {
3965     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3966     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3967       "mua_wrapper is set");
3968     }
3969   daemon_go();
3970   }
3971
3972 /* If the sender ident has not been set (by a trusted caller) set it to
3973 the caller. This will get overwritten below for an inetd call. If a trusted
3974 caller has set it empty, unset it. */
3975
3976 if (sender_ident == NULL) sender_ident = originator_login;
3977   else if (sender_ident[0] == 0) sender_ident = NULL;
3978
3979 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3980 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3981 originator_* variables set. */
3982
3983 if (test_rewrite_arg >= 0)
3984   {
3985   really_exim = FALSE;
3986   if (test_rewrite_arg >= argc)
3987     {
3988     printf("-brw needs an address argument\n");
3989     exim_exit(EXIT_FAILURE);
3990     }
3991   rewrite_test(argv[test_rewrite_arg]);
3992   exim_exit(EXIT_SUCCESS);
3993   }
3994
3995 /* A locally-supplied message is considered to be coming from a local user
3996 unless a trusted caller supplies a sender address with -f, or is passing in the
3997 message via SMTP (inetd invocation or otherwise). */
3998
3999 if ((sender_address == NULL && !smtp_input) ||
4000     (!trusted_caller && filter_test == FTEST_NONE))
4001   {
4002   sender_local = TRUE;
4003
4004   /* A trusted caller can supply authenticated_sender and authenticated_id
4005   via -oMas and -oMai and if so, they will already be set. */
4006
4007   if (authenticated_sender == NULL)
4008     authenticated_sender = string_sprintf("%s@%s", originator_login,
4009       qualify_domain_sender);
4010   if (authenticated_id == NULL) authenticated_id = originator_login;
4011   }
4012
4013 /* Trusted callers are always permitted to specify the sender address.
4014 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4015 is specified is the empty address. However, if a trusted caller does not
4016 specify a sender address for SMTP input, we leave sender_address unset. This
4017 causes the MAIL commands to be honoured. */
4018
4019 if ((!smtp_input && sender_address == NULL) ||
4020     !receive_check_set_sender(sender_address))
4021   {
4022   /* Either the caller is not permitted to set a general sender, or this is
4023   non-SMTP input and the trusted caller has not set a sender. If there is no
4024   sender, or if a sender other than <> is set, override with the originator's
4025   login (which will get qualified below), except when checking things. */
4026
4027   if (sender_address == NULL             /* No sender_address set */
4028        ||                                /*         OR            */
4029        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4030        !checking &&                      /* Not running tests, AND */
4031        filter_test == FTEST_NONE))       /* Not testing a filter */
4032     {
4033     sender_address = originator_login;
4034     sender_address_forced = FALSE;
4035     sender_address_domain = 0;
4036     }
4037   }
4038
4039 /* Remember whether an untrusted caller set the sender address */
4040
4041 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4042
4043 /* Ensure that the sender address is fully qualified unless it is the empty
4044 address, which indicates an error message, or doesn't exist (root caller, smtp
4045 interface, no -f argument). */
4046
4047 if (sender_address != NULL && sender_address[0] != 0 &&
4048     sender_address_domain == 0)
4049   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4050     qualify_domain_sender);
4051
4052 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4053
4054 /* Handle a request to verify a list of addresses, or test them for delivery.
4055 This must follow the setting of the sender address, since routers can be
4056 predicated upon the sender. If no arguments are given, read addresses from
4057 stdin. Set debug_level to at least D_v to get full output for address testing.
4058 */
4059
4060 if (verify_address_mode || address_test_mode)
4061   {
4062   int exit_value = 0;
4063   int flags = vopt_qualify;
4064
4065   if (verify_address_mode)
4066     {
4067     if (!verify_as_sender) flags |= vopt_is_recipient;
4068     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4069     }
4070
4071   else
4072     {
4073     flags |= vopt_is_recipient;
4074     debug_selector |= D_v;
4075     debug_file = stderr;
4076     debug_fd = fileno(debug_file);
4077     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4078     }
4079
4080   if (recipients_arg < argc)
4081     {
4082     while (recipients_arg < argc)
4083       {
4084       uschar *s = argv[recipients_arg++];
4085       while (*s != 0)
4086         {
4087         BOOL finished = FALSE;
4088         uschar *ss = parse_find_address_end(s, FALSE);
4089         if (*ss == ',') *ss = 0; else finished = TRUE;
4090         test_address(s, flags, &exit_value);
4091         s = ss;
4092         if (!finished)
4093           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4094         }
4095       }
4096     }
4097
4098   else for (;;)
4099     {
4100     uschar *s = get_stdinput(NULL, NULL);
4101     if (s == NULL) break;
4102     test_address(s, flags, &exit_value);
4103     }
4104
4105   route_tidyup();
4106   exim_exit(exit_value);
4107   }
4108
4109 /* Handle expansion checking */
4110
4111 if (expansion_test)
4112   {
4113   if (recipients_arg < argc)
4114     {
4115     while (recipients_arg < argc)
4116       {
4117       uschar *s = argv[recipients_arg++];
4118       uschar *ss = expand_string(s);
4119       if (ss == NULL)
4120         printf ("Failed: %s\n", expand_string_message);
4121       else printf("%s\n", CS ss);
4122       }
4123     }
4124
4125   /* Read stdin */
4126
4127   else
4128     {
4129     char *(*fn_readline)(char *) = NULL;
4130     char *(*fn_addhist)(char *) = NULL;
4131
4132     #ifdef USE_READLINE
4133     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4134     #endif
4135
4136     for (;;)
4137       {
4138       uschar *ss;
4139       uschar *source = get_stdinput(fn_readline, fn_addhist);
4140       if (source == NULL) break;
4141       ss = expand_string(source);
4142       if (ss == NULL)
4143         printf ("Failed: %s\n", expand_string_message);
4144       else printf("%s\n", CS ss);
4145       }
4146
4147     #ifdef USE_READLINE
4148     if (dlhandle != NULL) dlclose(dlhandle);
4149     #endif
4150     }
4151
4152   exim_exit(EXIT_SUCCESS);
4153   }
4154
4155
4156 /* The active host name is normally the primary host name, but it can be varied
4157 for hosts that want to play several parts at once. We need to ensure that it is
4158 set for host checking, and for receiving messages. */
4159
4160 smtp_active_hostname = primary_hostname;
4161 if (raw_active_hostname != NULL)
4162   {
4163   uschar *nah = expand_string(raw_active_hostname);
4164   if (nah == NULL)
4165     {
4166     if (!expand_string_forcedfail)
4167       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4168         "(smtp_active_hostname): %s", raw_active_hostname,
4169         expand_string_message);
4170     }
4171   else if (nah[0] != 0) smtp_active_hostname = nah;
4172   }
4173
4174 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4175 given IP address so that the blocking and relay configuration can be tested. An
4176 RFC 1413 call is made only if we are running in the test harness and an
4177 incoming interface and both ports are specified, because there is no TCP/IP
4178 call to find the ident for. */
4179
4180 if (host_checking)
4181   {
4182   int x[4];
4183   int size;
4184
4185   sender_ident = NULL;
4186   if (running_in_test_harness && sender_host_port != 0 &&
4187       interface_address != NULL && interface_port != 0)
4188     verify_get_ident(1413);
4189
4190   /* In case the given address is a non-canonical IPv6 address, canonicize
4191   it. The code works for both IPv4 and IPv6, as it happens. */
4192
4193   size = host_aton(sender_host_address, x);
4194   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4195   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4196
4197   /* Now set up for testing */
4198
4199   host_build_sender_fullhost();
4200   smtp_input = TRUE;
4201   smtp_in = stdin;
4202   smtp_out = stdout;
4203   sender_local = FALSE;
4204   sender_host_notsocket = TRUE;
4205   debug_file = stderr;
4206   debug_fd = fileno(debug_file);
4207   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4208     "**** but without any ident (RFC 1413) callback.\n"
4209     "**** This is not for real!\n\n",
4210       sender_host_address);
4211
4212   if (verify_check_host(&hosts_connection_nolog) == OK)
4213     log_write_selector &= ~L_smtp_connection;
4214   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4215
4216   if (smtp_start_session())
4217     {
4218     reset_point = store_get(0);
4219     for (;;)
4220       {
4221       store_reset(reset_point);
4222       if (smtp_setup_msg() <= 0) break;
4223       if (!receive_msg(FALSE)) break;
4224       }
4225     }
4226   exim_exit(EXIT_SUCCESS);
4227   }
4228
4229
4230 /* Arrange for message reception if recipients or SMTP were specified;
4231 otherwise complain unless a version print (-bV) happened or this is a filter
4232 verification test. In the former case, show the configuration file name. */
4233
4234 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4235   {
4236   if (version_printed)
4237     {
4238     printf("Configuration file is %s\n", config_main_filename);
4239     return EXIT_SUCCESS;
4240     }
4241   if (filter_test == FTEST_NONE)
4242     {
4243     fprintf(stderr,
4244 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
4245 "not directly from a shell command line. Options and/or arguments control\n"
4246 "what it does when called. For a list of options, see the Exim documentation.\n");
4247     return EXIT_FAILURE;
4248     }
4249   }
4250
4251
4252 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4253 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4254 that we are not called from inetd, because that is rejected above. The
4255 following configuration settings are forced here:
4256
4257   (1) Synchronous delivery (-odi)
4258   (2) Errors to stderr (-oep == -oeq)
4259   (3) No parallel remote delivery
4260   (4) Unprivileged delivery
4261
4262 We don't force overall queueing options because there are several of them;
4263 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4264 to override any SMTP queueing. */
4265
4266 if (mua_wrapper)
4267   {
4268   synchronous_delivery = TRUE;
4269   arg_error_handling = ERRORS_STDERR;
4270   remote_max_parallel = 1;
4271   deliver_drop_privilege = TRUE;
4272   queue_smtp = FALSE;
4273   queue_smtp_domains = NULL;
4274   }
4275
4276
4277 /* Prepare to accept one or more new messages on the standard input. When a
4278 message has been read, its id is returned in message_id[]. If doing immediate
4279 delivery, we fork a delivery process for each received message, except for the
4280 last one, where we can save a process switch.
4281
4282 It is only in non-smtp mode that error_handling is allowed to be changed from
4283 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4284 sendmail error modes other than -oem ever actually used? Later: yes.) */
4285
4286 if (!smtp_input) error_handling = arg_error_handling;
4287
4288 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4289 logging being sent down the socket and make an identd call to get the
4290 sender_ident. */
4291
4292 else if (is_inetd)
4293   {
4294   (void)fclose(stderr);
4295   exim_nullstd();                       /* Re-open to /dev/null */
4296   verify_get_ident(IDENT_PORT);
4297   host_build_sender_fullhost();
4298   set_process_info("handling incoming connection from %s via inetd",
4299     sender_fullhost);
4300   }
4301
4302 /* If the sender host address has been set, build sender_fullhost if it hasn't
4303 already been done (which it will have been for inetd). This caters for the
4304 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4305 so that the test for IP options is skipped for -bs input. */
4306
4307 if (sender_host_address != NULL && sender_fullhost == NULL)
4308   {
4309   host_build_sender_fullhost();
4310   set_process_info("handling incoming connection from %s via -oMa",
4311     sender_fullhost);
4312   sender_host_notsocket = TRUE;
4313   }
4314
4315 /* Otherwise, set the sender host as unknown except for inetd calls. This
4316 prevents host checking in the case of -bs not from inetd and also for -bS. */
4317
4318 else if (!is_inetd) sender_host_unknown = TRUE;
4319
4320 /* If stdout does not exist, then dup stdin to stdout. This can happen
4321 if exim is started from inetd. In this case fd 0 will be set to the socket,
4322 but fd 1 will not be set. This also happens for passed SMTP channels. */
4323
4324 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4325
4326 /* Set up the incoming protocol name and the state of the program. Root
4327 is allowed to force received protocol via the -oMr option above, and if we are
4328 in a non-local SMTP state it means we have come via inetd and the process info
4329 has already been set up. We don't set received_protocol here for smtp input,
4330 as it varies according to batch/HELO/EHLO/AUTH/TLS. */
4331
4332 if (smtp_input)
4333   {
4334   if (sender_local) set_process_info("accepting a local SMTP message from <%s>",
4335     sender_address);
4336   }
4337 else
4338   {
4339   if (received_protocol == NULL)
4340     received_protocol = string_sprintf("local%s", called_as);
4341   set_process_info("accepting a local non-SMTP message from <%s>",
4342     sender_address);
4343   }
4344
4345 /* Initialize the local_queue-only flag (this will be ignored if mua_wrapper is
4346 set) */
4347
4348 queue_check_only();
4349 local_queue_only = queue_only;
4350
4351 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4352 the spool if so configured. On failure, we must not attempt to send an error
4353 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4354 error code is given.) */
4355
4356 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4357   {
4358   fprintf(stderr, "exim: insufficient disk space\n");
4359   return EXIT_FAILURE;
4360   }
4361
4362 /* If this is smtp input of any kind, handle the start of the SMTP
4363 session. */
4364
4365 if (smtp_input)
4366   {
4367   smtp_in = stdin;
4368   smtp_out = stdout;
4369   if (verify_check_host(&hosts_connection_nolog) == OK)
4370     log_write_selector &= ~L_smtp_connection;
4371   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4372   if (!smtp_start_session())
4373     {
4374     mac_smtp_fflush();
4375     exim_exit(EXIT_SUCCESS);
4376     }
4377   }
4378
4379 /* Otherwise, set up the input size limit here */
4380
4381 else
4382   {
4383   thismessage_size_limit = expand_string_integer(message_size_limit);
4384   if (thismessage_size_limit < 0)
4385     {
4386     if (thismessage_size_limit == -1)
4387       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4388         "message_size_limit: %s", expand_string_message);
4389     else
4390       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4391         "message_size_limit: %s", expand_string_message);
4392     }
4393   }
4394
4395 /* Loop for several messages when reading SMTP input. If we fork any child
4396 processes, we don't want to wait for them unless synchronous delivery is
4397 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4398 same as SIG_DFL, despite the fact that documentation often lists the default as
4399 "ignore". This is a confusing area. This is what I know:
4400
4401 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4402 processes that complete simply to go away without ever becoming defunct. You
4403 can't then wait for them - but we don't want to wait for them in the
4404 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4405 happen for all OS (e.g. *BSD is different).
4406
4407 But that's not the end of the story. Some (many? all?) systems have the
4408 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4409 has by default, so it seems that the difference is merely one of default
4410 (compare restarting vs non-restarting signals).
4411
4412 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4413 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4414 of the loop below. Paranoia rules.
4415
4416 February 2003: That's *still* not the end of the story. There are now versions
4417 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4418 process then calls waitpid(), a grumble is written to the system log, because
4419 this is logically inconsistent. In other words, it doesn't like the paranoia.
4420 As a consequenc of this, the waitpid() below is now excluded if we are sure
4421 that SIG_IGN works. */
4422
4423 if (!synchronous_delivery)
4424   {
4425   #ifdef SA_NOCLDWAIT
4426   struct sigaction act;
4427   act.sa_handler = SIG_IGN;
4428   sigemptyset(&(act.sa_mask));
4429   act.sa_flags = SA_NOCLDWAIT;
4430   sigaction(SIGCHLD, &act, NULL);
4431   #else
4432   signal(SIGCHLD, SIG_IGN);
4433   #endif
4434   }
4435
4436 /* Save the current store pool point, for resetting at the start of
4437 each message, and save the real sender address, if any. */
4438
4439 reset_point = store_get(0);
4440 real_sender_address = sender_address;
4441
4442 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4443 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4444 collapsed). */
4445
4446 while (more)
4447   {
4448   store_reset(reset_point);
4449   message_id[0] = 0;
4450
4451   /* In the SMTP case, we have to handle the initial SMTP input and build the
4452   recipients list, before calling receive_msg() to read the message proper.
4453   Whatever sender address is actually given in the SMTP transaction is
4454   actually ignored for local senders - we use the actual sender, which is
4455   normally either the underlying user running this process or a -f argument
4456   provided by a trusted caller. It is saved in real_sender_address.
4457
4458   However, if this value is NULL, we are dealing with a trusted caller when
4459   -f was not used; in this case, the SMTP sender is allowed to stand.
4460
4461   Also, if untrusted_set_sender is set, we permit sender addresses that match
4462   anything in its list.
4463
4464   The variable raw_sender_address holds the sender address before rewriting. */
4465
4466   if (smtp_input)
4467     {
4468     int rc;
4469     if ((rc = smtp_setup_msg()) > 0)
4470       {
4471       if (real_sender_address != NULL &&
4472           !receive_check_set_sender(sender_address))
4473         {
4474         sender_address = raw_sender = real_sender_address;
4475         sender_address_unrewritten = NULL;
4476         }
4477       more = receive_msg(extract_recipients);
4478       if (message_id[0] == 0)
4479         {
4480         if (more) continue;
4481         exim_exit(EXIT_FAILURE);
4482         }
4483       }
4484     else exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4485     }
4486
4487   /* In the non-SMTP case, we have all the information from the command
4488   line, but must process it in case it is in the more general RFC822
4489   format, and in any case, to detect syntax errors. Also, it appears that
4490   the use of comma-separated lists as single arguments is common, so we
4491   had better support them. */
4492
4493   else
4494     {
4495     int i;
4496     int rcount = 0;
4497     int count = argc - recipients_arg;
4498     uschar **list = argv + recipients_arg;
4499
4500     /* These options cannot be changed dynamically for non-SMTP messages */
4501
4502     active_local_sender_retain = local_sender_retain;
4503     active_local_from_check = local_from_check;
4504
4505     /* Save before any rewriting */
4506
4507     raw_sender = string_copy(sender_address);
4508
4509     /* Loop for each argument */
4510
4511     for (i = 0; i < count; i++)
4512       {
4513       int start, end, domain;
4514       uschar *errmess;
4515       uschar *s = list[i];
4516
4517       /* Loop for each comma-separated address */
4518
4519       while (*s != 0)
4520         {
4521         BOOL finished = FALSE;
4522         uschar *recipient;
4523         uschar *ss = parse_find_address_end(s, FALSE);
4524
4525         if (*ss == ',') *ss = 0; else finished = TRUE;
4526
4527         /* Check max recipients - if -t was used, these aren't recipients */
4528
4529         if (recipients_max > 0 && ++rcount > recipients_max &&
4530             !extract_recipients)
4531           {
4532           if (error_handling == ERRORS_STDERR)
4533             {
4534             fprintf(stderr, "exim: too many recipients\n");
4535             exim_exit(EXIT_FAILURE);
4536             }
4537           else
4538             {
4539             return
4540               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4541                 errors_sender_rc : EXIT_FAILURE;
4542             }
4543           }
4544
4545         recipient =
4546           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4547
4548         if (domain == 0 && !allow_unqualified_recipient)
4549           {
4550           recipient = NULL;
4551           errmess = US"unqualified recipient address not allowed";
4552           }
4553
4554         if (recipient == NULL)
4555           {
4556           if (error_handling == ERRORS_STDERR)
4557             {
4558             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4559               string_printing(list[i]), errmess);
4560             exim_exit(EXIT_FAILURE);
4561             }
4562           else
4563             {
4564             error_block eblock;
4565             eblock.next = NULL;
4566             eblock.text1 = string_printing(list[i]);
4567             eblock.text2 = errmess;
4568             return
4569               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4570                 errors_sender_rc : EXIT_FAILURE;
4571             }
4572           }
4573
4574         receive_add_recipient(recipient, -1);
4575         s = ss;
4576         if (!finished)
4577           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4578         }
4579       }
4580
4581     /* Show the recipients when debugging */
4582
4583     DEBUG(D_receive)
4584       {
4585       int i;
4586       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4587       if (recipients_list != NULL)
4588         {
4589         debug_printf("Recipients:\n");
4590         for (i = 0; i < recipients_count; i++)
4591           debug_printf("  %s\n", recipients_list[i].address);
4592         }
4593       }
4594
4595     /* Read the data for the message. If filter_test is not FTEST_NONE, this
4596     will just read the headers for the message, and not write anything onto the
4597     spool. */
4598
4599     message_ended = END_NOTENDED;
4600     more = receive_msg(extract_recipients);
4601
4602     /* more is always FALSE here (not SMTP message) when reading a message
4603     for real; when reading the headers of a message for filter testing,
4604     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4605
4606     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4607     }  /* Non-SMTP message reception */
4608
4609   /* If this is a filter testing run, there are headers in store, but
4610   no message on the spool. Run the filtering code in testing mode, setting
4611   the domain to the qualify domain and the local part to the current user,
4612   unless they have been set by options. The prefix and suffix are left unset
4613   unless specified. The the return path is set to to the sender unless it has
4614   already been set from a return-path header in the message. */
4615
4616   if (filter_test != FTEST_NONE)
4617     {
4618     deliver_domain = (ftest_domain != NULL)?
4619       ftest_domain : qualify_domain_recipient;
4620     deliver_domain_orig = deliver_domain;
4621     deliver_localpart = (ftest_localpart != NULL)?
4622       ftest_localpart : originator_login;
4623     deliver_localpart_orig = deliver_localpart;
4624     deliver_localpart_prefix = ftest_prefix;
4625     deliver_localpart_suffix = ftest_suffix;
4626     deliver_home = originator_home;
4627
4628     if (return_path == NULL)
4629       {
4630       printf("Return-path copied from sender\n");
4631       return_path = string_copy(sender_address);
4632       }
4633     else
4634       {
4635       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4636       }
4637     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4638
4639     receive_add_recipient(
4640       string_sprintf("%s%s%s@%s",
4641         (ftest_prefix == NULL)? US"" : ftest_prefix,
4642         deliver_localpart,
4643         (ftest_suffix == NULL)? US"" : ftest_suffix,
4644         deliver_domain), -1);
4645
4646     printf("Recipient   = %s\n", recipients_list[0].address);
4647     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
4648     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
4649
4650     (void)chdir("/");   /* Get away from wherever the user is running this from */
4651
4652     /* Now we run either a system filter test, or a user filter test, or both.
4653     In the latter case, headers added by the system filter will persist and be
4654     available to the user filter. We need to copy the filter variables
4655     explicitly. */
4656
4657     if ((filter_test & FTEST_SYSTEM) != 0)
4658       {
4659       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4660         exim_exit(EXIT_FAILURE);
4661       }
4662
4663     memcpy(filter_sn, filter_n, sizeof(filter_sn));
4664
4665     if ((filter_test & FTEST_USER) != 0)
4666       {
4667       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4668         exim_exit(EXIT_FAILURE);
4669       }
4670
4671     exim_exit(EXIT_SUCCESS);
4672     }
4673
4674   /* Else act on the result of message reception. We should not get here unless
4675   message_id[0] is non-zero. If queue_only is set, local_queue_only will be
4676   TRUE. If it is not, check on the number of messages received in this
4677   connection. If that's OK and queue_only_load is set, check that the load
4678   average is below it. If it is not, set local_queue_only TRUE. Note that it
4679   then remains this way for any subsequent messages on the same SMTP connection.
4680   This is a deliberate choice; even though the load average may fall, it
4681   doesn't seem right to deliver later messages on the same call when not
4682   delivering earlier ones. */
4683
4684   if (!local_queue_only)
4685     {
4686     if (smtp_accept_queue_per_connection > 0 &&
4687         receive_messagecount > smtp_accept_queue_per_connection)
4688       {
4689       local_queue_only = TRUE;
4690       queue_only_reason = 2;
4691       }
4692     else if (queue_only_load >= 0)
4693       {
4694       local_queue_only = (load_average = os_getloadavg()) > queue_only_load;
4695       if (local_queue_only) queue_only_reason = 3;
4696       }
4697     }
4698
4699   /* If running as an MUA wrapper, all queueing options and freezing options
4700   are ignored. */
4701
4702   if (mua_wrapper)
4703     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4704
4705   /* Log the queueing here, when it will get a message id attached, but
4706   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4707   connections). */
4708
4709   if (local_queue_only) switch(queue_only_reason)
4710     {
4711     case 2:
4712     log_write(L_delay_delivery,
4713               LOG_MAIN, "no immediate delivery: more than %d messages "
4714       "received in one connection", smtp_accept_queue_per_connection);
4715     break;
4716
4717     case 3:
4718     log_write(L_delay_delivery,
4719               LOG_MAIN, "no immediate delivery: load average %.2f",
4720               (double)load_average/1000.0);
4721     break;
4722     }
4723
4724   /* Else do the delivery unless the ACL or local_scan() called for queue only
4725   or froze the message. Always deliver in a separate process. A fork failure is
4726   not a disaster, as the delivery will eventually happen on a subsequent queue
4727   run. The search cache must be tidied before the fork, as the parent will
4728   do it before exiting. The child will trigger a lookup failure and
4729   thereby defer the delivery if it tries to use (for example) a cached ldap
4730   connection that the parent has called unbind on. */
4731
4732   else if (!queue_only_policy && !deliver_freeze)
4733     {
4734     pid_t pid;
4735     search_tidyup();
4736
4737     if ((pid = fork()) == 0)
4738       {
4739       int rc;
4740       close_unwanted();      /* Close unwanted file descriptors and TLS */
4741       exim_nullstd();        /* Ensure std{in,out,err} exist */
4742
4743       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
4744       mode, deliver_drop_privilege is forced TRUE). */
4745
4746       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
4747         {
4748         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
4749           message_id);
4750         /* Control does not return here. */
4751         }
4752
4753       /* No need to re-exec */
4754
4755       rc = deliver_message(message_id, FALSE, FALSE);
4756       search_tidyup();
4757       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
4758         EXIT_SUCCESS : EXIT_FAILURE);
4759       }
4760
4761     if (pid < 0)
4762       {
4763       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
4764         "process: %s", strerror(errno));
4765       }
4766
4767     /* In the parent, wait if synchronous delivery is required. This will
4768     always be the case in MUA wrapper mode. */
4769
4770     else if (synchronous_delivery)
4771       {
4772       int status;
4773       while (wait(&status) != pid);
4774       if ((status & 0x00ff) != 0)
4775         log_write(0, LOG_MAIN|LOG_PANIC,
4776           "process %d crashed with signal %d while delivering %s",
4777           (int)pid, status & 0x00ff, message_id);
4778       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
4779       }
4780     }
4781
4782   /* The loop will repeat if more is TRUE. If we do not know know that the OS
4783   automatically reaps children (see comments above the loop), clear away any
4784   finished subprocesses here, in case there are lots of messages coming in
4785   from the same source. */
4786
4787   #ifndef SIG_IGN_WORKS
4788   while (waitpid(-1, NULL, WNOHANG) > 0);
4789   #endif
4790   }
4791
4792 exim_exit(EXIT_SUCCESS);   /* Never returns */
4793 return 0;                  /* To stop compiler warning */
4794 }
4795
4796 /* End of exim.c */