src/src/exim.c

   1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2009 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10
  11 /* The main function: entry point, initialization, and high-level control.
  12 Also a few functions that don't naturally fit elsewhere. */
  13
  14
  15 #include "exim.h"
  16
  17 extern void init_lookup_list(void);
  18
  19
  20
  21 /*************************************************
  22 *      Function interface to store functions     *
  23 *************************************************/
  24
  25 /* We need some real functions to pass to the PCRE regular expression library
  26 for store allocation via Exim's store manager. The normal calls are actually
  27 macros that pass over location information to make tracing easier. These
  28 functions just interface to the standard macro calls. A good compiler will
  29 optimize out the tail recursion and so not make them too expensive. There
  30 are two sets of functions; one for use when we want to retain the compiled
  31 regular expression for a long time; the other for short-term use. */
  32
  33 static void *
  34 function_store_get(size_t size)
  35 {
  36 return store_get((int)size);
  37 }
  38
  39 static void
  40 function_dummy_free(void *block) { block = block; }
  41
  42 static void *
  43 function_store_malloc(size_t size)
  44 {
  45 return store_malloc((int)size);
  46 }
  47
  48 static void
  49 function_store_free(void *block)
  50 {
  51 store_free(block);
  52 }
  53
  54
  55
  56
  57 /*************************************************
  58 *  Compile regular expression and panic on fail  *
  59 *************************************************/
  60
  61 /* This function is called when failure to compile a regular expression leads
  62 to a panic exit. In other cases, pcre_compile() is called directly. In many
  63 cases where this function is used, the results of the compilation are to be
  64 placed in long-lived store, so we temporarily reset the store management
  65 functions that PCRE uses if the use_malloc flag is set.
  66
  67 Argument:
  68   pattern     the pattern to compile
  69   caseless    TRUE if caseless matching is required
  70   use_malloc  TRUE if compile into malloc store
  71
  72 Returns:      pointer to the compiled pattern
  73 */
  74
  75 const pcre *
  76 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
  77 {
  78 int offset;
  79 int options = PCRE_COPT;
  80 const pcre *yield;
  81 const uschar *error;
  82 if (use_malloc)
  83   {
  84   pcre_malloc = function_store_malloc;
  85   pcre_free = function_store_free;
  86   }
  87 if (caseless) options |= PCRE_CASELESS;
  88 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
  89 pcre_malloc = function_store_get;
  90 pcre_free = function_dummy_free;
  91 if (yield == NULL)
  92   log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
  93     "%s at offset %d while compiling %s", error, offset, pattern);
  94 return yield;
  95 }
  96
  97
  98
  99
 100 /*************************************************
 101 *   Execute regular expression and set strings   *
 102 *************************************************/
 103
 104 /* This function runs a regular expression match, and sets up the pointers to
 105 the matched substrings.
 106
 107 Arguments:
 108   re          the compiled expression
 109   subject     the subject string
 110   options     additional PCRE options
 111   setup       if < 0 do full setup
 112               if >= 0 setup from setup+1 onwards,
 113                 excluding the full matched string
 114
 115 Returns:      TRUE or FALSE
 116 */
 117
 118 BOOL
 119 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
 120 {
 121 int ovector[3*(EXPAND_MAXN+1)];
 122 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
 123   PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
 124 BOOL yield = n >= 0;
 125 if (n == 0) n = EXPAND_MAXN + 1;
 126 if (yield)
 127   {
 128   int nn;
 129   expand_nmax = (setup < 0)? 0 : setup + 1;
 130   for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
 131     {
 132     expand_nstring[expand_nmax] = subject + ovector[nn];
 133     expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
 134     }
 135   expand_nmax--;
 136   }
 137 return yield;
 138 }
 139
 140
 141
 142
 143 /*************************************************
 144 *             Handler for SIGUSR1                *
 145 *************************************************/
 146
 147 /* SIGUSR1 causes any exim process to write to the process log details of
 148 what it is currently doing. It will only be used if the OS is capable of
 149 setting up a handler that causes automatic restarting of any system call
 150 that is in progress at the time.
 151
 152 Argument: the signal number (SIGUSR1)
 153 Returns:  nothing
 154 */
 155
 156 static void
 157 usr1_handler(int sig)
 158 {
 159 sig = sig;      /* Keep picky compilers happy */
 160 log_write(0, LOG_PROCESS, "%s", process_info);
 161 log_close_all();
 162 os_restarting_signal(SIGUSR1, usr1_handler);
 163 }
 164
 165
 166
 167 /*************************************************
 168 *             Timeout handler                    *
 169 *************************************************/
 170
 171 /* This handler is enabled most of the time that Exim is running. The handler
 172 doesn't actually get used unless alarm() has been called to set a timer, to
 173 place a time limit on a system call of some kind. When the handler is run, it
 174 re-enables itself.
 175
 176 There are some other SIGALRM handlers that are used in special cases when more
 177 than just a flag setting is required; for example, when reading a message's
 178 input. These are normally set up in the code module that uses them, and the
 179 SIGALRM handler is reset to this one afterwards.
 180
 181 Argument: the signal value (SIGALRM)
 182 Returns:  nothing
 183 */
 184
 185 void
 186 sigalrm_handler(int sig)
 187 {
 188 sig = sig;      /* Keep picky compilers happy */
 189 sigalrm_seen = TRUE;
 190 os_non_restarting_signal(SIGALRM, sigalrm_handler);
 191 }
 192
 193
 194
 195 /*************************************************
 196 *      Sleep for a fractional time interval      *
 197 *************************************************/
 198
 199 /* This function is called by millisleep() and exim_wait_tick() to wait for a
 200 period of time that may include a fraction of a second. The coding is somewhat
 201 tedious. We do not expect setitimer() ever to fail, but if it does, the process
 202 will wait for ever, so we panic in this instance. (There was a case of this
 203 when a bug in a function that calls milliwait() caused it to pass invalid data.
 204 That's when I added the check. :-)
 205
 206 Argument:  an itimerval structure containing the interval
 207 Returns:   nothing
 208 */
 209
 210 static void
 211 milliwait(struct itimerval *itval)
 212 {
 213 sigset_t sigmask;
 214 sigset_t old_sigmask;
 215 (void)sigemptyset(&sigmask);                           /* Empty mask */
 216 (void)sigaddset(&sigmask, SIGALRM);                    /* Add SIGALRM */
 217 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask);  /* Block SIGALRM */
 218 if (setitimer(ITIMER_REAL, itval, NULL) < 0)           /* Start timer */
 219   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
 220     "setitimer() failed: %s", strerror(errno));
 221 (void)sigfillset(&sigmask);                            /* All signals */
 222 (void)sigdelset(&sigmask, SIGALRM);                    /* Remove SIGALRM */
 223 (void)sigsuspend(&sigmask);                            /* Until SIGALRM */
 224 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL);    /* Restore mask */
 225 }
 226
 227
 228
 229
 230 /*************************************************
 231 *         Millisecond sleep function             *
 232 *************************************************/
 233
 234 /* The basic sleep() function has a granularity of 1 second, which is too rough
 235 in some cases - for example, when using an increasing delay to slow down
 236 spammers.
 237
 238 Argument:    number of millseconds
 239 Returns:     nothing
 240 */
 241
 242 void
 243 millisleep(int msec)
 244 {
 245 struct itimerval itval;
 246 itval.it_interval.tv_sec = 0;
 247 itval.it_interval.tv_usec = 0;
 248 itval.it_value.tv_sec = msec/1000;
 249 itval.it_value.tv_usec = (msec % 1000) * 1000;
 250 milliwait(&itval);
 251 }
 252
 253
 254
 255 /*************************************************
 256 *         Compare microsecond times              *
 257 *************************************************/
 258
 259 /*
 260 Arguments:
 261   tv1         the first time
 262   tv2         the second time
 263
 264 Returns:      -1, 0, or +1
 265 */
 266
 267 int
 268 exim_tvcmp(struct timeval *t1, struct timeval *t2)
 269 {
 270 if (t1->tv_sec > t2->tv_sec) return +1;
 271 if (t1->tv_sec < t2->tv_sec) return -1;
 272 if (t1->tv_usec > t2->tv_usec) return +1;
 273 if (t1->tv_usec < t2->tv_usec) return -1;
 274 return 0;
 275 }
 276
 277
 278
 279
 280 /*************************************************
 281 *          Clock tick wait function              *
 282 *************************************************/
 283
 284 /* Exim uses a time + a pid to generate a unique identifier in two places: its
 285 message IDs, and in file names for maildir deliveries. Because some OS now
 286 re-use pids within the same second, sub-second times are now being used.
 287 However, for absolute certaintly, we must ensure the clock has ticked before
 288 allowing the relevant process to complete. At the time of implementation of
 289 this code (February 2003), the speed of processors is such that the clock will
 290 invariably have ticked already by the time a process has done its job. This
 291 function prepares for the time when things are faster - and it also copes with
 292 clocks that go backwards.
 293
 294 Arguments:
 295   then_tv      A timeval which was used to create uniqueness; its usec field
 296                  has been rounded down to the value of the resolution.
 297                  We want to be sure the current time is greater than this.
 298   resolution   The resolution that was used to divide the microseconds
 299                  (1 for maildir, larger for message ids)
 300
 301 Returns:       nothing
 302 */
 303
 304 void
 305 exim_wait_tick(struct timeval *then_tv, int resolution)
 306 {
 307 struct timeval now_tv;
 308 long int now_true_usec;
 309
 310 (void)gettimeofday(&now_tv, NULL);
 311 now_true_usec = now_tv.tv_usec;
 312 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
 313
 314 if (exim_tvcmp(&now_tv, then_tv) <= 0)
 315   {
 316   struct itimerval itval;
 317   itval.it_interval.tv_sec = 0;
 318   itval.it_interval.tv_usec = 0;
 319   itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
 320   itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
 321
 322   /* We know that, overall, "now" is less than or equal to "then". Therefore, a
 323   negative value for the microseconds is possible only in the case when "now"
 324   is more than a second less than "then". That means that itval.it_value.tv_sec
 325   is greater than zero. The following correction is therefore safe. */
 326
 327   if (itval.it_value.tv_usec < 0)
 328     {
 329     itval.it_value.tv_usec += 1000000;
 330     itval.it_value.tv_sec -= 1;
 331     }
 332
 333   DEBUG(D_transport|D_receive)
 334     {
 335     if (!running_in_test_harness)
 336       {
 337       debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
 338         then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
 339       debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
 340         itval.it_value.tv_usec);
 341       }
 342     }
 343
 344   milliwait(&itval);
 345   }
 346 }
 347
 348
 349
 350
 351 /*************************************************
 352 *            Set up processing details           *
 353 *************************************************/
 354
 355 /* Save a text string for dumping when SIGUSR1 is received.
 356 Do checks for overruns.
 357
 358 Arguments: format and arguments, as for printf()
 359 Returns:   nothing
 360 */
 361
 362 void
 363 set_process_info(const char *format, ...)
 364 {
 365 int len;
 366 va_list ap;
 367 sprintf(CS process_info, "%5d ", (int)getpid());
 368 len = Ustrlen(process_info);
 369 va_start(ap, format);
 370 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
 371   Ustrcpy(process_info + len, "**** string overflowed buffer ****");
 372 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
 373 va_end(ap);
 374 }
 375
 376
 377
 378
 379
 380 /*************************************************
 381 *   Call fopen() with umask 777 and adjust mode  *
 382 *************************************************/
 383
 384 /* Exim runs with umask(0) so that files created with open() have the mode that
 385 is specified in the open() call. However, there are some files, typically in
 386 the spool directory, that are created with fopen(). They end up world-writeable
 387 if no precautions are taken. Although the spool directory is not accessible to
 388 the world, this is an untidiness. So this is a wrapper function for fopen()
 389 that sorts out the mode of the created file.
 390
 391 Arguments:
 392    filename       the file name
 393    options        the fopen() options
 394    mode           the required mode
 395
 396 Returns:          the fopened FILE or NULL
 397 */
 398
 399 FILE *
 400 modefopen(const uschar *filename, const char *options, mode_t mode)
 401 {
 402 mode_t saved_umask = umask(0777);
 403 FILE *f = Ufopen(filename, options);
 404 (void)umask(saved_umask);
 405 if (f != NULL) (void)fchmod(fileno(f), mode);
 406 return f;
 407 }
 408
 409
 410
 411
 412 /*************************************************
 413 *   Ensure stdin, stdout, and stderr exist       *
 414 *************************************************/
 415
 416 /* Some operating systems grumble if an exec() happens without a standard
 417 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
 418 file will be opened and will use these fd values, and then some other bit of
 419 code will assume, for example, that it can write error messages to stderr.
 420 This function ensures that fds 0, 1, and 2 are open if they do not already
 421 exist, by connecting them to /dev/null.
 422
 423 This function is also used to ensure that std{in,out,err} exist at all times,
 424 so that if any library that Exim calls tries to use them, it doesn't crash.
 425
 426 Arguments:  None
 427 Returns:    Nothing
 428 */
 429
 430 void
 431 exim_nullstd(void)
 432 {
 433 int i;
 434 int devnull = -1;
 435 struct stat statbuf;
 436 for (i = 0; i <= 2; i++)
 437   {
 438   if (fstat(i, &statbuf) < 0 && errno == EBADF)
 439     {
 440     if (devnull < 0) devnull = open("/dev/null", O_RDWR);
 441     if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
 442       string_open_failed(errno, "/dev/null"));
 443     if (devnull != i) (void)dup2(devnull, i);
 444     }
 445   }
 446 if (devnull > 2) (void)close(devnull);
 447 }
 448
 449
 450
 451
 452 /*************************************************
 453 *   Close unwanted file descriptors for delivery *
 454 *************************************************/
 455
 456 /* This function is called from a new process that has been forked to deliver
 457 an incoming message, either directly, or using exec.
 458
 459 We want any smtp input streams to be closed in this new process. However, it
 460 has been observed that using fclose() here causes trouble. When reading in -bS
 461 input, duplicate copies of messages have been seen. The files will be sharing a
 462 file pointer with the parent process, and it seems that fclose() (at least on
 463 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
 464 least sometimes. Hence we go for closing the underlying file descriptors.
 465
 466 If TLS is active, we want to shut down the TLS library, but without molesting
 467 the parent's SSL connection.
 468
 469 For delivery of a non-SMTP message, we want to close stdin and stdout (and
 470 stderr unless debugging) because the calling process might have set them up as
 471 pipes and be waiting for them to close before it waits for the submission
 472 process to terminate. If they aren't closed, they hold up the calling process
 473 until the initial delivery process finishes, which is not what we want.
 474
 475 Exception: We do want it for synchronous delivery!
 476
 477 And notwithstanding all the above, if D_resolver is set, implying resolver
 478 debugging, leave stdout open, because that's where the resolver writes its
 479 debugging output.
 480
 481 When we close stderr (which implies we've also closed stdout), we also get rid
 482 of any controlling terminal.
 483
 484 Arguments:   None
 485 Returns:     Nothing
 486 */
 487
 488 static void
 489 close_unwanted(void)
 490 {
 491 if (smtp_input)
 492   {
 493   #ifdef SUPPORT_TLS
 494   tls_close(FALSE);      /* Shut down the TLS library */
 495   #endif
 496   (void)close(fileno(smtp_in));
 497   (void)close(fileno(smtp_out));
 498   smtp_in = NULL;
 499   }
 500 else
 501   {
 502   (void)close(0);                                          /* stdin */
 503   if ((debug_selector & D_resolver) == 0) (void)close(1);  /* stdout */
 504   if (debug_selector == 0)                                 /* stderr */
 505     {
 506     if (!synchronous_delivery)
 507       {
 508       (void)close(2);
 509       log_stderr = NULL;
 510       }
 511     (void)setsid();
 512     }
 513   }
 514 }
 515
 516
 517
 518
 519 /*************************************************
 520 *          Set uid and gid                       *
 521 *************************************************/
 522
 523 /* This function sets a new uid and gid permanently, optionally calling
 524 initgroups() to set auxiliary groups. There are some special cases when running
 525 Exim in unprivileged modes. In these situations the effective uid will not be
 526 root; if we already have the right effective uid/gid, and don't need to
 527 initialize any groups, leave things as they are.
 528
 529 Arguments:
 530   uid        the uid
 531   gid        the gid
 532   igflag     TRUE if initgroups() wanted
 533   msg        text to use in debugging output and failure log
 534
 535 Returns:     nothing; bombs out on failure
 536 */
 537
 538 void
 539 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
 540 {
 541 uid_t euid = geteuid();
 542 gid_t egid = getegid();
 543
 544 if (euid == root_uid || euid != uid || egid != gid || igflag)
 545   {
 546   /* At least one OS returns +1 for initgroups failure, so just check for
 547   non-zero. */
 548
 549   if (igflag)
 550     {
 551     struct passwd *pw = getpwuid(uid);
 552     if (pw != NULL)
 553       {
 554       if (initgroups(pw->pw_name, gid) != 0)
 555         log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
 556           (long int)uid, strerror(errno));
 557       }
 558     else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
 559       "no passwd entry for uid=%ld", (long int)uid);
 560     }
 561
 562   if (setgid(gid) < 0 || setuid(uid) < 0)
 563     {
 564     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
 565       "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
 566     }
 567   }
 568
 569 /* Debugging output included uid/gid and all groups */
 570
 571 DEBUG(D_uid)
 572   {
 573   int group_count, save_errno;
 574   gid_t group_list[NGROUPS_MAX];
 575   debug_printf("changed uid/gid: %s\n  uid=%ld gid=%ld pid=%ld\n", msg,
 576     (long int)geteuid(), (long int)getegid(), (long int)getpid());
 577   group_count = getgroups(NGROUPS_MAX, group_list);
 578   save_errno = errno;
 579   debug_printf("  auxiliary group list:");
 580   if (group_count > 0)
 581     {
 582     int i;
 583     for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
 584     }
 585   else if (group_count < 0)
 586     debug_printf(" <error: %s>", strerror(save_errno));
 587   else debug_printf(" <none>");
 588   debug_printf("\n");
 589   }
 590 }
 591
 592
 593
 594
 595 /*************************************************
 596 *               Exit point                       *
 597 *************************************************/
 598
 599 /* Exim exits via this function so that it always clears up any open
 600 databases.
 601
 602 Arguments:
 603   rc         return code
 604
 605 Returns:     does not return
 606 */
 607
 608 void
 609 exim_exit(int rc)
 610 {
 611 search_tidyup();
 612 DEBUG(D_any)
 613   debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
 614     ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
 615 exit(rc);
 616 }
 617
 618
 619
 620
 621 /*************************************************
 622 *         Extract port from host address         *
 623 *************************************************/
 624
 625 /* Called to extract the port from the values given to -oMa and -oMi.
 626 It also checks the syntax of the address, and terminates it before the
 627 port data when a port is extracted.
 628
 629 Argument:
 630   address   the address, with possible port on the end
 631
 632 Returns:    the port, or zero if there isn't one
 633             bombs out on a syntax error
 634 */
 635
 636 static int
 637 check_port(uschar *address)
 638 {
 639 int port = host_address_extract_port(address);
 640 if (string_is_ip_address(address, NULL) == 0)
 641   {
 642   fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
 643   exit(EXIT_FAILURE);
 644   }
 645 return port;
 646 }
 647
 648
 649
 650 /*************************************************
 651 *              Test/verify an address            *
 652 *************************************************/
 653
 654 /* This function is called by the -bv and -bt code. It extracts a working
 655 address from a full RFC 822 address. This isn't really necessary per se, but it
 656 has the effect of collapsing source routes.
 657
 658 Arguments:
 659   s            the address string
 660   flags        flag bits for verify_address()
 661   exit_value   to be set for failures
 662
 663 Returns:       nothing
 664 */
 665
 666 static void
 667 test_address(uschar *s, int flags, int *exit_value)
 668 {
 669 int start, end, domain;
 670 uschar *parse_error = NULL;
 671 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
 672   FALSE);
 673 if (address == NULL)
 674   {
 675   fprintf(stdout, "syntax error: %s\n", parse_error);
 676   *exit_value = 2;
 677   }
 678 else
 679   {
 680   int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
 681     -1, -1, NULL, NULL, NULL);
 682   if (rc == FAIL) *exit_value = 2;
 683     else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
 684   }
 685 }
 686
 687
 688
 689 /*************************************************
 690 *          Show supported features               *
 691 *************************************************/
 692
 693 /* This function is called for -bV/--version and for -d to output the optional
 694 features of the current Exim binary.
 695
 696 Arguments:  a FILE for printing
 697 Returns:    nothing
 698 */
 699
 700 static void
 701 show_whats_supported(FILE *f)
 702 {
 703 #ifdef DB_VERSION_STRING
 704 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
 705 #elif defined(BTREEVERSION) && defined(HASHVERSION)
 706   #ifdef USE_DB
 707   fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
 708   #else
 709   fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
 710   #endif
 711 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
 712 fprintf(f, "Probably ndbm\n");
 713 #elif defined(USE_TDB)
 714 fprintf(f, "Using tdb\n");
 715 #else
 716   #ifdef USE_GDBM
 717   fprintf(f, "Probably GDBM (native mode)\n");
 718   #else
 719   fprintf(f, "Probably GDBM (compatibility mode)\n");
 720   #endif
 721 #endif
 722
 723 fprintf(f, "Support for:");
 724 #ifdef SUPPORT_CRYPTEQ
 725   fprintf(f, " crypteq");
 726 #endif
 727 #if HAVE_ICONV
 728   fprintf(f, " iconv()");
 729 #endif
 730 #if HAVE_IPV6
 731   fprintf(f, " IPv6");
 732 #endif
 733 #ifdef HAVE_SETCLASSRESOURCES
 734   fprintf(f, " use_setclassresources");
 735 #endif
 736 #ifdef SUPPORT_PAM
 737   fprintf(f, " PAM");
 738 #endif
 739 #ifdef EXIM_PERL
 740   fprintf(f, " Perl");
 741 #endif
 742 #ifdef EXPAND_DLFUNC
 743   fprintf(f, " Expand_dlfunc");
 744 #endif
 745 #ifdef USE_TCP_WRAPPERS
 746   fprintf(f, " TCPwrappers");
 747 #endif
 748 #ifdef SUPPORT_TLS
 749   #ifdef USE_GNUTLS
 750   fprintf(f, " GnuTLS");
 751   #else
 752   fprintf(f, " OpenSSL");
 753   #endif
 754 #endif
 755 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
 756   fprintf(f, " translate_ip_address");
 757 #endif
 758 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
 759   fprintf(f, " move_frozen_messages");
 760 #endif
 761 #ifdef WITH_CONTENT_SCAN
 762   fprintf(f, " Content_Scanning");
 763 #endif
 764 #ifndef DISABLE_DKIM
 765   fprintf(f, " DKIM");
 766 #endif
 767 #ifdef WITH_OLD_DEMIME
 768   fprintf(f, " Old_Demime");
 769 #endif
 770 #ifdef EXPERIMENTAL_SPF
 771   fprintf(f, " Experimental_SPF");
 772 #endif
 773 #ifdef EXPERIMENTAL_SRS
 774   fprintf(f, " Experimental_SRS");
 775 #endif
 776 #ifdef EXPERIMENTAL_BRIGHTMAIL
 777   fprintf(f, " Experimental_Brightmail");
 778 #endif
 779 #ifdef EXPERIMENTAL_DCC
 780   fprintf(f, " Experimental_DCC");
 781 #endif
 782 fprintf(f, "\n");
 783
 784 fprintf(f, "Lookups (built-in):");
 785 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
 786   fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
 787 #endif
 788 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
 789   fprintf(f, " cdb");
 790 #endif
 791 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
 792   fprintf(f, " dbm dbmnz");
 793 #endif
 794 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
 795   fprintf(f, " dnsdb");
 796 #endif
 797 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
 798   fprintf(f, " dsearch");
 799 #endif
 800 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
 801   fprintf(f, " ibase");
 802 #endif
 803 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
 804   fprintf(f, " ldap ldapdn ldapm");
 805 #endif
 806 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
 807   fprintf(f, " mysql");
 808 #endif
 809 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
 810   fprintf(f, " nis nis0");
 811 #endif
 812 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
 813   fprintf(f, " nisplus");
 814 #endif
 815 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
 816   fprintf(f, " oracle");
 817 #endif
 818 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
 819   fprintf(f, " passwd");
 820 #endif
 821 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
 822   fprintf(f, " pgsql");
 823 #endif
 824 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
 825   fprintf(f, " sqlite");
 826 #endif
 827 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
 828   fprintf(f, " testdb");
 829 #endif
 830 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
 831   fprintf(f, " whoson");
 832 #endif
 833 fprintf(f, "\n");
 834
 835 fprintf(f, "Authenticators:");
 836 #ifdef AUTH_CRAM_MD5
 837   fprintf(f, " cram_md5");
 838 #endif
 839 #ifdef AUTH_CYRUS_SASL
 840   fprintf(f, " cyrus_sasl");
 841 #endif
 842 #ifdef AUTH_DOVECOT
 843   fprintf(f, " dovecot");
 844 #endif
 845 #ifdef AUTH_PLAINTEXT
 846   fprintf(f, " plaintext");
 847 #endif
 848 #ifdef AUTH_SPA
 849   fprintf(f, " spa");
 850 #endif
 851 fprintf(f, "\n");
 852
 853 fprintf(f, "Routers:");
 854 #ifdef ROUTER_ACCEPT
 855   fprintf(f, " accept");
 856 #endif
 857 #ifdef ROUTER_DNSLOOKUP
 858   fprintf(f, " dnslookup");
 859 #endif
 860 #ifdef ROUTER_IPLITERAL
 861   fprintf(f, " ipliteral");
 862 #endif
 863 #ifdef ROUTER_IPLOOKUP
 864   fprintf(f, " iplookup");
 865 #endif
 866 #ifdef ROUTER_MANUALROUTE
 867   fprintf(f, " manualroute");
 868 #endif
 869 #ifdef ROUTER_QUERYPROGRAM
 870   fprintf(f, " queryprogram");
 871 #endif
 872 #ifdef ROUTER_REDIRECT
 873   fprintf(f, " redirect");
 874 #endif
 875 fprintf(f, "\n");
 876
 877 fprintf(f, "Transports:");
 878 #ifdef TRANSPORT_APPENDFILE
 879   fprintf(f, " appendfile");
 880   #ifdef SUPPORT_MAILDIR
 881     fprintf(f, "/maildir");
 882   #endif
 883   #ifdef SUPPORT_MAILSTORE
 884     fprintf(f, "/mailstore");
 885   #endif
 886   #ifdef SUPPORT_MBX
 887     fprintf(f, "/mbx");
 888   #endif
 889 #endif
 890 #ifdef TRANSPORT_AUTOREPLY
 891   fprintf(f, " autoreply");
 892 #endif
 893 #ifdef TRANSPORT_LMTP
 894   fprintf(f, " lmtp");
 895 #endif
 896 #ifdef TRANSPORT_PIPE
 897   fprintf(f, " pipe");
 898 #endif
 899 #ifdef TRANSPORT_SMTP
 900   fprintf(f, " smtp");
 901 #endif
 902 fprintf(f, "\n");
 903
 904 if (fixed_never_users[0] > 0)
 905   {
 906   int i;
 907   fprintf(f, "Fixed never_users: ");
 908   for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
 909     fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
 910   fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
 911   }
 912
 913 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
 914
 915 /* This runtime check is to help diagnose library linkage mismatches which
 916 result in segfaults and the like; as such, it's left until the end,
 917 just in case.  There will still be a "Configuration file is" line still to
 918 come. */
 919 #ifdef SUPPORT_TLS
 920 tls_version_report(f);
 921 #endif
 922
 923 /* Everything else is details which are only worth reporting when debugging.
 924 Perhaps the tls_version_report should move into this too. */
 925 DEBUG(D_any) do {
 926
 927   int i;
 928
 929 /* clang defines __GNUC__ (at least, for me) so test for it first */
 930 #if defined(__clang__)
 931   fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
 932 #elif defined(__GNUC__)
 933   fprintf(f, "Compiler: GCC [%s]\n",
 934 # ifdef __VERSION__
 935       __VERSION__
 936 # else
 937       "? unknown version ?"
 938 # endif
 939       );
 940 #else
 941   fprintf(f, "Compiler: <unknown>\n");
 942 #endif
 943
 944 #ifdef AUTH_CYRUS_SASL
 945   auth_cyrus_sasl_version_report(f);
 946 #endif
 947
 948   fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
 949              "                       Runtime: %s\n",
 950           PCRE_MAJOR, PCRE_MINOR,
 951           /* PRE_PRERELEASE is either defined and empty or a string.
 952            * unless its an ancient version of PCRE in which case it
 953            * is not defined */
 954 #ifdef PCRE_PRERELEASE
 955           PCRE_PRERELEASE "",
 956 #else
 957           "",
 958 #endif
 959           pcre_version());
 960
 961   init_lookup_list();
 962   for (i = 0; i < lookup_list_count; i++)
 963     {
 964     if (lookup_list[i]->version_report)
 965       lookup_list[i]->version_report(f);
 966     }
 967
 968 #ifdef WHITELIST_D_MACROS
 969   fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
 970 #else
 971   fprintf(f, "WHITELIST_D_MACROS unset\n");
 972 #endif
 973 #ifdef TRUSTED_CONFIG_LIST
 974   fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
 975 #else
 976   fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
 977 #endif
 978
 979 } while (0);
 980 }
 981
 982
 983
 984
 985 /*************************************************
 986 *               Quote a local part               *
 987 *************************************************/
 988
 989 /* This function is used when a sender address or a From: or Sender: header
 990 line is being created from the caller's login, or from an authenticated_id. It
 991 applies appropriate quoting rules for a local part.
 992
 993 Argument:    the local part
 994 Returns:     the local part, quoted if necessary
 995 */
 996
 997 uschar *
 998 local_part_quote(uschar *lpart)
 999 {
1000 BOOL needs_quote = FALSE;
1001 int size, ptr;
1002 uschar *yield;
1003 uschar *t;
1004
1005 for (t = lpart; !needs_quote && *t != 0; t++)
1006   {
1007   needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1008     (*t != '.' || t == lpart || t[1] == 0);
1009   }
1010
1011 if (!needs_quote) return lpart;
1012
1013 size = ptr = 0;
1014 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1015
1016 for (;;)
1017   {
1018   uschar *nq = US Ustrpbrk(lpart, "\\\"");
1019   if (nq == NULL)
1020     {
1021     yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1022     break;
1023     }
1024   yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1025   yield = string_cat(yield, &size, &ptr, US"\\", 1);
1026   yield = string_cat(yield, &size, &ptr, nq, 1);
1027   lpart = nq + 1;
1028   }
1029
1030 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1031 yield[ptr] = 0;
1032 return yield;
1033 }
1034
1035
1036
1037 #ifdef USE_READLINE
1038 /*************************************************
1039 *         Load readline() functions              *
1040 *************************************************/
1041
1042 /* This function is called from testing executions that read data from stdin,
1043 but only when running as the calling user. Currently, only -be does this. The
1044 function loads the readline() function library and passes back the functions.
1045 On some systems, it needs the curses library, so load that too, but try without
1046 it if loading fails. All this functionality has to be requested at build time.
1047
1048 Arguments:
1049   fn_readline_ptr   pointer to where to put the readline pointer
1050   fn_addhist_ptr    pointer to where to put the addhistory function
1051
1052 Returns:            the dlopen handle or NULL on failure
1053 */
1054
1055 static void *
1056 set_readline(char * (**fn_readline_ptr)(const char *),
1057              void   (**fn_addhist_ptr)(const char *))
1058 {
1059 void *dlhandle;
1060 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1061
1062 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1063 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1064
1065 if (dlhandle != NULL)
1066   {
1067   /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1068    *   char * readline (const char *prompt);
1069    *   void add_history (const char *string);
1070    */
1071   *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1072   *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1073   }
1074 else
1075   {
1076   DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1077   }
1078
1079 return dlhandle;
1080 }
1081 #endif
1082
1083
1084
1085 /*************************************************
1086 *    Get a line from stdin for testing things    *
1087 *************************************************/
1088
1089 /* This function is called when running tests that can take a number of lines
1090 of input (for example, -be and -bt). It handles continuations and trailing
1091 spaces. And prompting and a blank line output on eof. If readline() is in use,
1092 the arguments are non-NULL and provide the relevant functions.
1093
1094 Arguments:
1095   fn_readline   readline function or NULL
1096   fn_addhist    addhist function or NULL
1097
1098 Returns:        pointer to dynamic memory, or NULL at end of file
1099 */
1100
1101 static uschar *
1102 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1103 {
1104 int i;
1105 int size = 0;
1106 int ptr = 0;
1107 uschar *yield = NULL;
1108
1109 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1110
1111 for (i = 0;; i++)
1112   {
1113   uschar buffer[1024];
1114   uschar *p, *ss;
1115
1116   #ifdef USE_READLINE
1117   char *readline_line = NULL;
1118   if (fn_readline != NULL)
1119     {
1120     if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1121     if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1122     p = US readline_line;
1123     }
1124   else
1125   #endif
1126
1127   /* readline() not in use */
1128
1129     {
1130     if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1131     p = buffer;
1132     }
1133
1134   /* Handle the line */
1135
1136   ss = p + (int)Ustrlen(p);
1137   while (ss > p && isspace(ss[-1])) ss--;
1138
1139   if (i > 0)
1140     {
1141     while (p < ss && isspace(*p)) p++;   /* leading space after cont */
1142     }
1143
1144   yield = string_cat(yield, &size, &ptr, p, ss - p);
1145
1146   #ifdef USE_READLINE
1147   if (fn_readline != NULL) free(readline_line);
1148   #endif
1149
1150   if (ss == p || yield[ptr-1] != '\\')
1151     {
1152     yield[ptr] = 0;
1153     break;
1154     }
1155   yield[--ptr] = 0;
1156   }
1157
1158 if (yield == NULL) printf("\n");
1159 return yield;
1160 }
1161
1162
1163
1164 /*************************************************
1165 *    Output usage information for the program    *
1166 *************************************************/
1167
1168 /* This function is called when there are no recipients
1169    or a specific --help argument was added.
1170
1171 Arguments:
1172   progname      information on what name we were called by
1173
1174 Returns:        DOES NOT RETURN
1175 */
1176
1177 static void
1178 exim_usage(uschar *progname)
1179 {
1180
1181 /* Handle specific program invocation varients */
1182 if (Ustrcmp(progname, US"-mailq") == 0)
1183   {
1184   fprintf(stderr,
1185     "mailq - list the contents of the mail queue\n\n"
1186     "For a list of options, see the Exim documentation.\n");
1187   exit(EXIT_FAILURE);
1188   }
1189
1190 /* Generic usage - we output this whatever happens */
1191 fprintf(stderr,
1192   "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1193   "not directly from a shell command line. Options and/or arguments control\n"
1194   "what it does when called. For a list of options, see the Exim documentation.\n");
1195
1196 exit(EXIT_FAILURE);
1197 }
1198
1199
1200
1201 /*************************************************
1202 *    Validate that the macros given are okay     *
1203 *************************************************/
1204
1205 /* Typically, Exim will drop privileges if macros are supplied.  In some
1206 cases, we want to not do so.
1207
1208 Arguments:    none (macros is a global)
1209 Returns:      true if trusted, false otherwise
1210 */
1211
1212 static BOOL
1213 macros_trusted(void)
1214 {
1215 #ifdef WHITELIST_D_MACROS
1216 macro_item *m;
1217 uschar *whitelisted, *end, *p, **whites, **w;
1218 int white_count, i, n;
1219 size_t len;
1220 BOOL prev_char_item, found;
1221 #endif
1222
1223 if (macros == NULL)
1224   return TRUE;
1225 #ifndef WHITELIST_D_MACROS
1226 return FALSE;
1227 #else
1228
1229 /* We only trust -D overrides for some invoking users:
1230 root, the exim run-time user, the optional config owner user.
1231 I don't know why config-owner would be needed, but since they can own the
1232 config files anyway, there's no security risk to letting them override -D. */
1233 if ( ! ((real_uid == root_uid)
1234      || (real_uid == exim_uid)
1235 #ifdef CONFIGURE_OWNER
1236      || (real_uid == config_uid)
1237 #endif
1238    ))
1239   {
1240   debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1241   return FALSE;
1242   }
1243
1244 /* Get a list of macros which are whitelisted */
1245 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1246 prev_char_item = FALSE;
1247 white_count = 0;
1248 for (p = whitelisted; *p != '\0'; ++p)
1249   {
1250   if (*p == ':' || isspace(*p))
1251     {
1252     *p = '\0';
1253     if (prev_char_item)
1254       ++white_count;
1255     prev_char_item = FALSE;
1256     continue;
1257     }
1258   if (!prev_char_item)
1259     prev_char_item = TRUE;
1260   }
1261 end = p;
1262 if (prev_char_item)
1263   ++white_count;
1264 if (!white_count)
1265   return FALSE;
1266 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1267 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1268   {
1269   if (*p != '\0')
1270     {
1271     whites[i++] = p;
1272     if (i == white_count)
1273       break;
1274     while (*p != '\0' && p < end)
1275       ++p;
1276     }
1277   }
1278 whites[i] = NULL;
1279
1280 /* The list of macros should be very short.  Accept the N*M complexity. */
1281 for (m = macros; m != NULL; m = m->next)
1282   {
1283   found = FALSE;
1284   for (w = whites; *w; ++w)
1285     if (Ustrcmp(*w, m->name) == 0)
1286       {
1287       found = TRUE;
1288       break;
1289       }
1290   if (!found)
1291     return FALSE;
1292   if (m->replacement == NULL)
1293     continue;
1294   len = Ustrlen(m->replacement);
1295   if (len == 0)
1296     continue;
1297   n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1298    0, PCRE_EOPT, NULL, 0);
1299   if (n < 0)
1300     {
1301     if (n != PCRE_ERROR_NOMATCH)
1302       debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1303     return FALSE;
1304     }
1305   }
1306 DEBUG(D_any) debug_printf("macros_trusted overriden to true by whitelisting\n");
1307 return TRUE;
1308 #endif
1309 }
1310
1311
1312 /*************************************************
1313 *          Entry point and high-level code       *
1314 *************************************************/
1315
1316 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1317 the appropriate action. All the necessary functions are present in the one
1318 binary. I originally thought one should split it up, but it turns out that so
1319 much of the apparatus is needed in each chunk that one might as well just have
1320 it all available all the time, which then makes the coding easier as well.
1321
1322 Arguments:
1323   argc      count of entries in argv
1324   argv      argument strings, with argv[0] being the program name
1325
1326 Returns:    EXIT_SUCCESS if terminated successfully
1327             EXIT_FAILURE otherwise, except when a message has been sent
1328               to the sender, and -oee was given
1329 */
1330
1331 int
1332 main(int argc, char **cargv)
1333 {
1334 uschar **argv = USS cargv;
1335 int  arg_receive_timeout = -1;
1336 int  arg_smtp_receive_timeout = -1;
1337 int  arg_error_handling = error_handling;
1338 int  filter_sfd = -1;
1339 int  filter_ufd = -1;
1340 int  group_count;
1341 int  i, rv;
1342 int  list_queue_option = 0;
1343 int  msg_action = 0;
1344 int  msg_action_arg = -1;
1345 int  namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1346 int  queue_only_reason = 0;
1347 #ifdef EXIM_PERL
1348 int  perl_start_option = 0;
1349 #endif
1350 int  recipients_arg = argc;
1351 int  sender_address_domain = 0;
1352 int  test_retry_arg = -1;
1353 int  test_rewrite_arg = -1;
1354 BOOL arg_queue_only = FALSE;
1355 BOOL bi_option = FALSE;
1356 BOOL checking = FALSE;
1357 BOOL count_queue = FALSE;
1358 BOOL expansion_test = FALSE;
1359 BOOL extract_recipients = FALSE;
1360 BOOL forced_delivery = FALSE;
1361 BOOL f_end_dot = FALSE;
1362 BOOL deliver_give_up = FALSE;
1363 BOOL list_queue = FALSE;
1364 BOOL list_options = FALSE;
1365 BOOL local_queue_only;
1366 BOOL more = TRUE;
1367 BOOL one_msg_action = FALSE;
1368 BOOL queue_only_set = FALSE;
1369 BOOL receiving_message = TRUE;
1370 BOOL sender_ident_set = FALSE;
1371 BOOL session_local_queue_only;
1372 BOOL unprivileged;
1373 BOOL removed_privilege = FALSE;
1374 BOOL usage_wanted = FALSE;
1375 BOOL verify_address_mode = FALSE;
1376 BOOL verify_as_sender = FALSE;
1377 BOOL version_printed = FALSE;
1378 uschar *alias_arg = NULL;
1379 uschar *called_as = US"";
1380 uschar *start_queue_run_id = NULL;
1381 uschar *stop_queue_run_id = NULL;
1382 uschar *expansion_test_message = NULL;
1383 uschar *ftest_domain = NULL;
1384 uschar *ftest_localpart = NULL;
1385 uschar *ftest_prefix = NULL;
1386 uschar *ftest_suffix = NULL;
1387 uschar *malware_test_file = NULL;
1388 uschar *real_sender_address;
1389 uschar *originator_home = US"/";
1390 void *reset_point;
1391
1392 struct passwd *pw;
1393 struct stat statbuf;
1394 pid_t passed_qr_pid = (pid_t)0;
1395 int passed_qr_pipe = -1;
1396 gid_t group_list[NGROUPS_MAX];
1397
1398 /* Possible options for -R and -S */
1399
1400 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1401
1402 /* Need to define this in case we need to change the environment in order
1403 to get rid of a bogus time zone. We have to make it char rather than uschar
1404 because some OS define it in /usr/include/unistd.h. */
1405
1406 extern char **environ;
1407
1408 /* If the Exim user and/or group and/or the configuration file owner/group were
1409 defined by ref:name at build time, we must now find the actual uid/gid values.
1410 This is a feature to make the lives of binary distributors easier. */
1411
1412 #ifdef EXIM_USERNAME
1413 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1414   {
1415   if (exim_uid == 0)
1416     {
1417     fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1418       EXIM_USERNAME);
1419     exit(EXIT_FAILURE);
1420     }
1421   exim_gid = pw->pw_gid;
1422   }
1423 else
1424   {
1425   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1426     EXIM_USERNAME);
1427   exit(EXIT_FAILURE);
1428   }
1429 #endif
1430
1431 #ifdef EXIM_GROUPNAME
1432 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1433   {
1434   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1435     EXIM_GROUPNAME);
1436   exit(EXIT_FAILURE);
1437   }
1438 #endif
1439
1440 #ifdef CONFIGURE_OWNERNAME
1441 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1442   {
1443   fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1444     CONFIGURE_OWNERNAME);
1445   exit(EXIT_FAILURE);
1446   }
1447 #endif
1448
1449 /* We default the system_filter_user to be the Exim run-time user, as a
1450 sane non-root value. */
1451 system_filter_uid = exim_uid;
1452
1453 #ifdef CONFIGURE_GROUPNAME
1454 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1455   {
1456   fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1457     CONFIGURE_GROUPNAME);
1458   exit(EXIT_FAILURE);
1459   }
1460 #endif
1461
1462 /* In the Cygwin environment, some initialization needs doing. It is fudged
1463 in by means of this macro. */
1464
1465 #ifdef OS_INIT
1466 OS_INIT
1467 #endif
1468
1469 /* Check a field which is patched when we are running Exim within its
1470 testing harness; do a fast initial check, and then the whole thing. */
1471
1472 running_in_test_harness =
1473   *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1474
1475 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1476 at the start of a program; however, it seems that some environments do not
1477 follow this. A "strange" locale can affect the formatting of timestamps, so we
1478 make quite sure. */
1479
1480 setlocale(LC_ALL, "C");
1481
1482 /* Set up the default handler for timing using alarm(). */
1483
1484 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1485
1486 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1487 because store_malloc writes a log entry on failure. */
1488
1489 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1490 if (log_buffer == NULL)
1491   {
1492   fprintf(stderr, "exim: failed to get store for log buffer\n");
1493   exit(EXIT_FAILURE);
1494   }
1495
1496 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1497 NULL when the daemon is run and the file is closed. We have to use this
1498 indirection, because some systems don't allow writing to the variable "stderr".
1499 */
1500
1501 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1502
1503 /* Arrange for the PCRE regex library to use our store functions. Note that
1504 the normal calls are actually macros that add additional arguments for
1505 debugging purposes so we have to assign specially constructed functions here.
1506 The default is to use store in the stacking pool, but this is overridden in the
1507 regex_must_compile() function. */
1508
1509 pcre_malloc = function_store_get;
1510 pcre_free = function_dummy_free;
1511
1512 /* Ensure there is a big buffer for temporary use in several places. It is put
1513 in malloc store so that it can be freed for enlargement if necessary. */
1514
1515 big_buffer = store_malloc(big_buffer_size);
1516
1517 /* Set up the handler for the data request signal, and set the initial
1518 descriptive text. */
1519
1520 set_process_info("initializing");
1521 os_restarting_signal(SIGUSR1, usr1_handler);
1522
1523 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1524 in the daemon code. For the rest of Exim's uses, we ignore it. */
1525
1526 signal(SIGHUP, SIG_IGN);
1527
1528 /* We don't want to die on pipe errors as the code is written to handle
1529 the write error instead. */
1530
1531 signal(SIGPIPE, SIG_IGN);
1532
1533 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1534 set to SIG_IGN. This causes subprocesses that complete before the parent
1535 process waits for them not to hang around, so when Exim calls wait(), nothing
1536 is there. The wait() code has been made robust against this, but let's ensure
1537 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1538 ending status. We use sigaction rather than plain signal() on those OS where
1539 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1540 problem on AIX with this.) */
1541
1542 #ifdef SA_NOCLDWAIT
1543   {
1544   struct sigaction act;
1545   act.sa_handler = SIG_DFL;
1546   sigemptyset(&(act.sa_mask));
1547   act.sa_flags = 0;
1548   sigaction(SIGCHLD, &act, NULL);
1549   }
1550 #else
1551 signal(SIGCHLD, SIG_DFL);
1552 #endif
1553
1554 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1555 SIGHUP. */
1556
1557 sighup_argv = argv;
1558
1559 /* Set up the version number. Set up the leading 'E' for the external form of
1560 message ids, set the pointer to the internal form, and initialize it to
1561 indicate no message being processed. */
1562
1563 version_init();
1564 message_id_option[0] = '-';
1565 message_id_external = message_id_option + 1;
1566 message_id_external[0] = 'E';
1567 message_id = message_id_external + 1;
1568 message_id[0] = 0;
1569
1570 /* Set the umask to zero so that any files Exim creates using open() are
1571 created with the modes that it specifies. NOTE: Files created with fopen() have
1572 a problem, which was not recognized till rather late (February 2006). With this
1573 umask, such files will be world writeable. (They are all content scanning files
1574 in the spool directory, which isn't world-accessible, so this is not a
1575 disaster, but it's untidy.) I don't want to change this overall setting,
1576 however, because it will interact badly with the open() calls. Instead, there's
1577 now a function called modefopen() that fiddles with the umask while calling
1578 fopen(). */
1579
1580 (void)umask(0);
1581
1582 /* Precompile the regular expression for matching a message id. Keep this in
1583 step with the code that generates ids in the accept.c module. We need to do
1584 this here, because the -M options check their arguments for syntactic validity
1585 using mac_ismsgid, which uses this. */
1586
1587 regex_ismsgid =
1588   regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1589
1590 /* Precompile the regular expression that is used for matching an SMTP error
1591 code, possibly extended, at the start of an error message. Note that the
1592 terminating whitespace character is included. */
1593
1594 regex_smtp_code =
1595   regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1596     FALSE, TRUE);
1597
1598 #ifdef WHITELIST_D_MACROS
1599 /* Precompile the regular expression used to filter the content of macros
1600 given to -D for permissibility. */
1601
1602 regex_whitelisted_macro =
1603   regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1604 #endif
1605
1606
1607 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1608 this seems to be a generally accepted convention, since one finds symbolic
1609 links called "mailq" in standard OS configurations. */
1610
1611 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1612     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1613   {
1614   list_queue = TRUE;
1615   receiving_message = FALSE;
1616   called_as = US"-mailq";
1617   }
1618
1619 /* If the program is called as "rmail" treat it as equivalent to
1620 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1621 i.e. preventing a single dot on a line from terminating the message, and
1622 returning with zero return code, even in cases of error (provided an error
1623 message has been sent). */
1624
1625 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1626     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1627   {
1628   dot_ends = FALSE;
1629   called_as = US"-rmail";
1630   errors_sender_rc = EXIT_SUCCESS;
1631   }
1632
1633 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1634 this is a smail convention. */
1635
1636 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1637     (namelen  > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1638   {
1639   smtp_input = smtp_batched_input = TRUE;
1640   called_as = US"-rsmtp";
1641   }
1642
1643 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1644 this is a smail convention. */
1645
1646 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1647     (namelen  > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1648   {
1649   queue_interval = 0;
1650   receiving_message = FALSE;
1651   called_as = US"-runq";
1652   }
1653
1654 /* If the program is called as "newaliases" treat it as equivalent to
1655 "exim -bi"; this is a sendmail convention. */
1656
1657 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1658     (namelen  > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1659   {
1660   bi_option = TRUE;
1661   receiving_message = FALSE;
1662   called_as = US"-newaliases";
1663   }
1664
1665 /* Save the original effective uid for a couple of uses later. It should
1666 normally be root, but in some esoteric environments it may not be. */
1667
1668 original_euid = geteuid();
1669
1670 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1671 to be the same as the real ones. This makes a difference only if Exim is setuid
1672 (or setgid) to something other than root, which could be the case in some
1673 special configurations. */
1674
1675 real_uid = getuid();
1676 real_gid = getgid();
1677
1678 if (real_uid == root_uid)
1679   {
1680   rv = setgid(real_gid);
1681   if (rv)
1682     {
1683     fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1684         (long int)real_gid, strerror(errno));
1685     exit(EXIT_FAILURE);
1686     }
1687   rv = setuid(real_uid);
1688   if (rv)
1689     {
1690     fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1691         (long int)real_uid, strerror(errno));
1692     exit(EXIT_FAILURE);
1693     }
1694   }
1695
1696 /* If neither the original real uid nor the original euid was root, Exim is
1697 running in an unprivileged state. */
1698
1699 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1700
1701 /* Scan the program's arguments. Some can be dealt with right away; others are
1702 simply recorded for checking and handling afterwards. Do a high-level switch
1703 on the second character (the one after '-'), to save some effort. */
1704
1705 for (i = 1; i < argc; i++)
1706   {
1707   BOOL badarg = FALSE;
1708   uschar *arg = argv[i];
1709   uschar *argrest;
1710   int switchchar;
1711
1712   /* An argument not starting with '-' is the start of a recipients list;
1713   break out of the options-scanning loop. */
1714
1715   if (arg[0] != '-')
1716     {
1717     recipients_arg = i;
1718     break;
1719     }
1720
1721   /* An option consistion of -- terminates the options */
1722
1723   if (Ustrcmp(arg, "--") == 0)
1724     {
1725     recipients_arg = i + 1;
1726     break;
1727     }
1728
1729   /* Handle flagged options */
1730
1731   switchchar = arg[1];
1732   argrest = arg+2;
1733
1734   /* Make all -ex options synonymous with -oex arguments, since that
1735   is assumed by various callers. Also make -qR options synonymous with -R
1736   options, as that seems to be required as well. Allow for -qqR too, and
1737   the same for -S options. */
1738
1739   if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1740       Ustrncmp(arg+1, "qR", 2) == 0 ||
1741       Ustrncmp(arg+1, "qS", 2) == 0)
1742     {
1743     switchchar = arg[2];
1744     argrest++;
1745     }
1746   else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1747     {
1748     switchchar = arg[3];
1749     argrest += 2;
1750     queue_2stage = TRUE;
1751     }
1752
1753   /* Make -r synonymous with -f, since it is a documented alias */
1754
1755   else if (arg[1] == 'r') switchchar = 'f';
1756
1757   /* Make -ov synonymous with -v */
1758
1759   else if (Ustrcmp(arg, "-ov") == 0)
1760     {
1761     switchchar = 'v';
1762     argrest++;
1763     }
1764
1765   /* deal with --option_aliases */
1766   else if (switchchar == '-')
1767     {
1768     if (Ustrcmp(argrest, "help") == 0)
1769       {
1770       usage_wanted = TRUE;
1771       break;
1772       }
1773     else if (Ustrcmp(argrest, "version") == 0)
1774       {
1775       switchchar = 'b';
1776       argrest = US"V";
1777       }
1778     }
1779
1780   /* High-level switch on active initial letter */
1781
1782   switch(switchchar)
1783     {
1784     /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1785     so has no need of it. */
1786
1787     case 'B':
1788     if (*argrest == 0) i++;       /* Skip over the type */
1789     break;
1790
1791
1792     case 'b':
1793     receiving_message = FALSE;    /* Reset TRUE for -bm, -bS, -bs below */
1794
1795     /* -bd:  Run in daemon mode, awaiting SMTP connections.
1796        -bdf: Ditto, but in the foreground.
1797     */
1798
1799     if (*argrest == 'd')
1800       {
1801       daemon_listen = TRUE;
1802       if (*(++argrest) == 'f') background_daemon = FALSE;
1803         else if (*argrest != 0) { badarg = TRUE; break; }
1804       }
1805
1806     /* -be:  Run in expansion test mode
1807        -bem: Ditto, but read a message from a file first
1808     */
1809
1810     else if (*argrest == 'e')
1811       {
1812       expansion_test = checking = TRUE;
1813       if (argrest[1] == 'm')
1814         {
1815         if (++i >= argc) { badarg = TRUE; break; }
1816         expansion_test_message = argv[i];
1817         argrest++;
1818         }
1819       if (argrest[1] != 0) { badarg = TRUE; break; }
1820       }
1821
1822     /* -bF:  Run system filter test */
1823
1824     else if (*argrest == 'F')
1825       {
1826       filter_test |= FTEST_SYSTEM;
1827       if (*(++argrest) != 0) { badarg = TRUE; break; }
1828       if (++i < argc) filter_test_sfile = argv[i]; else
1829         {
1830         fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1831         exit(EXIT_FAILURE);
1832         }
1833       }
1834
1835     /* -bf:  Run user filter test
1836        -bfd: Set domain for filter testing
1837        -bfl: Set local part for filter testing
1838        -bfp: Set prefix for filter testing
1839        -bfs: Set suffix for filter testing
1840     */
1841
1842     else if (*argrest == 'f')
1843       {
1844       if (*(++argrest) == 0)
1845         {
1846         filter_test |= FTEST_USER;
1847         if (++i < argc) filter_test_ufile = argv[i]; else
1848           {
1849           fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1850           exit(EXIT_FAILURE);
1851           }
1852         }
1853       else
1854         {
1855         if (++i >= argc)
1856           {
1857           fprintf(stderr, "exim: string expected after %s\n", arg);
1858           exit(EXIT_FAILURE);
1859           }
1860         if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1861         else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1862         else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1863         else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1864         else { badarg = TRUE; break; }
1865         }
1866       }
1867
1868     /* -bh: Host checking - an IP address must follow. */
1869
1870     else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1871       {
1872       if (++i >= argc) { badarg = TRUE; break; }
1873       sender_host_address = argv[i];
1874       host_checking = checking = log_testing_mode = TRUE;
1875       host_checking_callout = argrest[1] == 'c';
1876       }
1877
1878     /* -bi: This option is used by sendmail to initialize *the* alias file,
1879     though it has the -oA option to specify a different file. Exim has no
1880     concept of *the* alias file, but since Sun's YP make script calls
1881     sendmail this way, some support must be provided. */
1882
1883     else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1884
1885     /* -bm: Accept and deliver message - the default option. Reinstate
1886     receiving_message, which got turned off for all -b options. */
1887
1888     else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1889
1890     /* -bmalware: test the filename given for malware */
1891
1892     else if (Ustrcmp(argrest, "malware") == 0)
1893       {
1894       if (++i >= argc) { badarg = TRUE; break; }
1895       malware_test_file = argv[i];
1896       }
1897
1898     /* -bnq: For locally originating messages, do not qualify unqualified
1899     addresses. In the envelope, this causes errors; in header lines they
1900     just get left. */
1901
1902     else if (Ustrcmp(argrest, "nq") == 0)
1903       {
1904       allow_unqualified_sender = FALSE;
1905       allow_unqualified_recipient = FALSE;
1906       }
1907
1908     /* -bpxx: List the contents of the mail queue, in various forms. If
1909     the option is -bpc, just a queue count is needed. Otherwise, if the
1910     first letter after p is r, then order is random. */
1911
1912     else if (*argrest == 'p')
1913       {
1914       if (*(++argrest) == 'c')
1915         {
1916         count_queue = TRUE;
1917         if (*(++argrest) != 0) badarg = TRUE;
1918         break;
1919         }
1920
1921       if (*argrest == 'r')
1922         {
1923         list_queue_option = 8;
1924         argrest++;
1925         }
1926       else list_queue_option = 0;
1927
1928       list_queue = TRUE;
1929
1930       /* -bp: List the contents of the mail queue, top-level only */
1931
1932       if (*argrest == 0) {}
1933
1934       /* -bpu: List the contents of the mail queue, top-level undelivered */
1935
1936       else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1937
1938       /* -bpa: List the contents of the mail queue, including all delivered */
1939
1940       else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1941
1942       /* Unknown after -bp[r] */
1943
1944       else
1945         {
1946         badarg = TRUE;
1947         break;
1948         }
1949       }
1950
1951
1952     /* -bP: List the configuration variables given as the address list.
1953     Force -v, so configuration errors get displayed. */
1954
1955     else if (Ustrcmp(argrest, "P") == 0)
1956       {
1957       list_options = TRUE;
1958       debug_selector |= D_v;
1959       debug_file = stderr;
1960       }
1961
1962     /* -brt: Test retry configuration lookup */
1963
1964     else if (Ustrcmp(argrest, "rt") == 0)
1965       {
1966       test_retry_arg = i + 1;
1967       goto END_ARG;
1968       }
1969
1970     /* -brw: Test rewrite configuration */
1971
1972     else if (Ustrcmp(argrest, "rw") == 0)
1973       {
1974       test_rewrite_arg = i + 1;
1975       goto END_ARG;
1976       }
1977
1978     /* -bS: Read SMTP commands on standard input, but produce no replies -
1979     all errors are reported by sending messages. */
1980
1981     else if (Ustrcmp(argrest, "S") == 0)
1982       smtp_input = smtp_batched_input = receiving_message = TRUE;
1983
1984     /* -bs: Read SMTP commands on standard input and produce SMTP replies
1985     on standard output. */
1986
1987     else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1988
1989     /* -bt: address testing mode */
1990
1991     else if (Ustrcmp(argrest, "t") == 0)
1992       address_test_mode = checking = log_testing_mode = TRUE;
1993
1994     /* -bv: verify addresses */
1995
1996     else if (Ustrcmp(argrest, "v") == 0)
1997       verify_address_mode = checking = log_testing_mode = TRUE;
1998
1999     /* -bvs: verify sender addresses */
2000
2001     else if (Ustrcmp(argrest, "vs") == 0)
2002       {
2003       verify_address_mode = checking = log_testing_mode = TRUE;
2004       verify_as_sender = TRUE;
2005       }
2006
2007     /* -bV: Print version string and support details */
2008
2009     else if (Ustrcmp(argrest, "V") == 0)
2010       {
2011       printf("Exim version %s #%s built %s\n", version_string,
2012         version_cnumber, version_date);
2013       printf("%s\n", CS version_copyright);
2014       version_printed = TRUE;
2015       show_whats_supported(stdout);
2016       }
2017
2018     else badarg = TRUE;
2019     break;
2020
2021
2022     /* -C: change configuration file list; ignore if it isn't really
2023     a change! Enforce a prefix check if required. */
2024
2025     case 'C':
2026     if (*argrest == 0)
2027       {
2028       if(++i < argc) argrest = argv[i]; else
2029         { badarg = TRUE; break; }
2030       }
2031     if (Ustrcmp(config_main_filelist, argrest) != 0)
2032       {
2033       #ifdef ALT_CONFIG_PREFIX
2034       int sep = 0;
2035       int len = Ustrlen(ALT_CONFIG_PREFIX);
2036       uschar *list = argrest;
2037       uschar *filename;
2038       while((filename = string_nextinlist(&list, &sep, big_buffer,
2039              big_buffer_size)) != NULL)
2040         {
2041         if ((Ustrlen(filename) < len ||
2042              Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2043              Ustrstr(filename, "/../") != NULL) &&
2044              (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2045           {
2046           fprintf(stderr, "-C Permission denied\n");
2047           exit(EXIT_FAILURE);
2048           }
2049         }
2050       #endif
2051       if (real_uid != root_uid)
2052         {
2053         #ifdef TRUSTED_CONFIG_LIST
2054
2055         if (real_uid != exim_uid
2056             #ifdef CONFIGURE_OWNER
2057             && real_uid != config_uid
2058             #endif
2059             )
2060           trusted_config = FALSE;
2061         else
2062           {
2063           FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2064           if (trust_list)
2065             {
2066             struct stat statbuf;
2067
2068             if (fstat(fileno(trust_list), &statbuf) != 0 ||
2069                 (statbuf.st_uid != root_uid        /* owner not root */
2070                  #ifdef CONFIGURE_OWNER
2071                  && statbuf.st_uid != config_uid   /* owner not the special one */
2072                  #endif
2073                    ) ||                            /* or */
2074                 (statbuf.st_gid != root_gid        /* group not root */
2075                  #ifdef CONFIGURE_GROUP
2076                  && statbuf.st_gid != config_gid   /* group not the special one */
2077                  #endif
2078                  && (statbuf.st_mode & 020) != 0   /* group writeable */
2079                    ) ||                            /* or */
2080                 (statbuf.st_mode & 2) != 0)        /* world writeable */
2081               {
2082               trusted_config = FALSE;
2083               fclose(trust_list);
2084               }
2085             else
2086               {
2087               /* Well, the trust list at least is up to scratch... */
2088               void *reset_point = store_get(0);
2089               uschar *trusted_configs[32];
2090               int nr_configs = 0;
2091               int i = 0;
2092
2093               while (Ufgets(big_buffer, big_buffer_size, trust_list))
2094                 {
2095                 uschar *start = big_buffer, *nl;
2096                 while (*start && isspace(*start))
2097                 start++;
2098                 if (*start != '/')
2099                   continue;
2100                 nl = Ustrchr(start, '\n');
2101                 if (nl)
2102                   *nl = 0;
2103                 trusted_configs[nr_configs++] = string_copy(start);
2104                 if (nr_configs == 32)
2105                   break;
2106                 }
2107               fclose(trust_list);
2108
2109               if (nr_configs)
2110                 {
2111                 int sep = 0;
2112                 uschar *list = argrest;
2113                 uschar *filename;
2114                 while (trusted_config && (filename = string_nextinlist(&list,
2115                         &sep, big_buffer, big_buffer_size)) != NULL)
2116                   {
2117                   for (i=0; i < nr_configs; i++)
2118                     {
2119                     if (Ustrcmp(filename, trusted_configs[i]) == 0)
2120                       break;
2121                     }
2122                   if (i == nr_configs)
2123                     {
2124                     trusted_config = FALSE;
2125                     break;
2126                     }
2127                   }
2128                 store_reset(reset_point);
2129                 }
2130               else
2131                 {
2132                 /* No valid prefixes found in trust_list file. */
2133                 trusted_config = FALSE;
2134                 }
2135               }
2136             }
2137           else
2138             {
2139             /* Could not open trust_list file. */
2140             trusted_config = FALSE;
2141             }
2142           }
2143       #else
2144         /* Not root; don't trust config */
2145         trusted_config = FALSE;
2146       #endif
2147         }
2148
2149       config_main_filelist = argrest;
2150       config_changed = TRUE;
2151       }
2152     break;
2153
2154
2155     /* -D: set up a macro definition */
2156
2157     case 'D':
2158     #ifdef DISABLE_D_OPTION
2159     fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2160     exit(EXIT_FAILURE);
2161     #else
2162       {
2163       int ptr = 0;
2164       macro_item *mlast = NULL;
2165       macro_item *m;
2166       uschar name[24];
2167       uschar *s = argrest;
2168
2169       while (isspace(*s)) s++;
2170
2171       if (*s < 'A' || *s > 'Z')
2172         {
2173         fprintf(stderr, "exim: macro name set by -D must start with "
2174           "an upper case letter\n");
2175         exit(EXIT_FAILURE);
2176         }
2177
2178       while (isalnum(*s) || *s == '_')
2179         {
2180         if (ptr < sizeof(name)-1) name[ptr++] = *s;
2181         s++;
2182         }
2183       name[ptr] = 0;
2184       if (ptr == 0) { badarg = TRUE; break; }
2185       while (isspace(*s)) s++;
2186       if (*s != 0)
2187         {
2188         if (*s++ != '=') { badarg = TRUE; break; }
2189         while (isspace(*s)) s++;
2190         }
2191
2192       for (m = macros; m != NULL; m = m->next)
2193         {
2194         if (Ustrcmp(m->name, name) == 0)
2195           {
2196           fprintf(stderr, "exim: duplicated -D in command line\n");
2197           exit(EXIT_FAILURE);
2198           }
2199         mlast = m;
2200         }
2201
2202       m = store_get(sizeof(macro_item) + Ustrlen(name));
2203       m->next = NULL;
2204       m->command_line = TRUE;
2205       if (mlast == NULL) macros = m; else mlast->next = m;
2206       Ustrcpy(m->name, name);
2207       m->replacement = string_copy(s);
2208
2209       if (clmacro_count >= MAX_CLMACROS)
2210         {
2211         fprintf(stderr, "exim: too many -D options on command line\n");
2212         exit(EXIT_FAILURE);
2213         }
2214       clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2215         m->replacement);
2216       }
2217     #endif
2218     break;
2219
2220     /* -d: Set debug level (see also -v below) or set the drop_cr option.
2221     The latter is now a no-op, retained for compatibility only. If -dd is used,
2222     debugging subprocesses of the daemon is disabled. */
2223
2224     case 'd':
2225     if (Ustrcmp(argrest, "ropcr") == 0)
2226       {
2227       /* drop_cr = TRUE; */
2228       }
2229
2230     /* Use an intermediate variable so that we don't set debugging while
2231     decoding the debugging bits. */
2232
2233     else
2234       {
2235       unsigned int selector = D_default;
2236       debug_selector = 0;
2237       debug_file = NULL;
2238       if (*argrest == 'd')
2239         {
2240         debug_daemon = TRUE;
2241         argrest++;
2242         }
2243       if (*argrest != 0)
2244         decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2245           debug_options_count, US"debug", 0);
2246       debug_selector = selector;
2247       }
2248     break;
2249
2250
2251     /* -E: This is a local error message. This option is not intended for
2252     external use at all, but is not restricted to trusted callers because it
2253     does no harm (just suppresses certain error messages) and if Exim is run
2254     not setuid root it won't always be trusted when it generates error
2255     messages using this option. If there is a message id following -E, point
2256     message_reference at it, for logging. */
2257
2258     case 'E':
2259     local_error_message = TRUE;
2260     if (mac_ismsgid(argrest)) message_reference = argrest;
2261     break;
2262
2263
2264     /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2265     option, so it looks as if historically the -oex options are also callable
2266     without the leading -o. So we have to accept them. Before the switch,
2267     anything starting -oe has been converted to -e. Exim does not support all
2268     of the sendmail error options. */
2269
2270     case 'e':
2271     if (Ustrcmp(argrest, "e") == 0)
2272       {
2273       arg_error_handling = ERRORS_SENDER;
2274       errors_sender_rc = EXIT_SUCCESS;
2275       }
2276     else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2277     else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2278     else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2279     else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2280     else badarg = TRUE;
2281     break;
2282
2283
2284     /* -F: Set sender's full name, used instead of the gecos entry from
2285     the password file. Since users can usually alter their gecos entries,
2286     there's no security involved in using this instead. The data can follow
2287     the -F or be in the next argument. */
2288
2289     case 'F':
2290     if (*argrest == 0)
2291       {
2292       if(++i < argc) argrest = argv[i]; else
2293         { badarg = TRUE; break; }
2294       }
2295     originator_name = argrest;
2296     sender_name_forced = TRUE;
2297     break;
2298
2299
2300     /* -f: Set sender's address - this value is only actually used if Exim is
2301     run by a trusted user, or if untrusted_set_sender is set and matches the
2302     address, except that the null address can always be set by any user. The
2303     test for this happens later, when the value given here is ignored when not
2304     permitted. For an untrusted user, the actual sender is still put in Sender:
2305     if it doesn't match the From: header (unless no_local_from_check is set).
2306     The data can follow the -f or be in the next argument. The -r switch is an
2307     obsolete form of -f but since there appear to be programs out there that
2308     use anything that sendmail has ever supported, better accept it - the
2309     synonymizing is done before the switch above.
2310
2311     At this stage, we must allow domain literal addresses, because we don't
2312     know what the setting of allow_domain_literals is yet. Ditto for trailing
2313     dots and strip_trailing_dot. */
2314
2315     case 'f':
2316       {
2317       int start, end;
2318       uschar *errmess;
2319       if (*argrest == 0)
2320         {
2321         if (i+1 < argc) argrest = argv[++i]; else
2322           { badarg = TRUE; break; }
2323         }
2324       if (*argrest == 0)
2325         {
2326         sender_address = string_sprintf("");  /* Ensure writeable memory */
2327         }
2328       else
2329         {
2330         uschar *temp = argrest + Ustrlen(argrest) - 1;
2331         while (temp >= argrest && isspace(*temp)) temp--;
2332         if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2333         allow_domain_literals = TRUE;
2334         strip_trailing_dot = TRUE;
2335         sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2336           &sender_address_domain, TRUE);
2337         allow_domain_literals = FALSE;
2338         strip_trailing_dot = FALSE;
2339         if (sender_address == NULL)
2340           {
2341           fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2342           return EXIT_FAILURE;
2343           }
2344         }
2345       sender_address_forced = TRUE;
2346       }
2347     break;
2348
2349     /* This is some Sendmail thing which can be ignored */
2350
2351     case 'G':
2352     break;
2353
2354     /* -h: Set the hop count for an incoming message. Exim does not currently
2355     support this; it always computes it by counting the Received: headers.
2356     To put it in will require a change to the spool header file format. */
2357
2358     case 'h':
2359     if (*argrest == 0)
2360       {
2361       if(++i < argc) argrest = argv[i]; else
2362         { badarg = TRUE; break; }
2363       }
2364     if (!isdigit(*argrest)) badarg = TRUE;
2365     break;
2366
2367
2368     /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2369     not to be documented for sendmail but mailx (at least) uses it) */
2370
2371     case 'i':
2372     if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2373     break;
2374
2375
2376     case 'M':
2377     receiving_message = FALSE;
2378
2379     /* -MC:  continue delivery of another message via an existing open
2380     file descriptor. This option is used for an internal call by the
2381     smtp transport when there is a pending message waiting to go to an
2382     address to which it has got a connection. Five subsequent arguments are
2383     required: transport name, host name, IP address, sequence number, and
2384     message_id. Transports may decline to create new processes if the sequence
2385     number gets too big. The channel is stdin. This (-MC) must be the last
2386     argument. There's a subsequent check that the real-uid is privileged.
2387
2388     If we are running in the test harness. delay for a bit, to let the process
2389     that set this one up complete. This makes for repeatability of the logging,
2390     etc. output. */
2391
2392     if (Ustrcmp(argrest, "C") == 0)
2393       {
2394       union sockaddr_46 interface_sock;
2395       EXIM_SOCKLEN_T size = sizeof(interface_sock);
2396
2397       if (argc != i + 6)
2398         {
2399         fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2400         return EXIT_FAILURE;
2401         }
2402
2403       if (msg_action_arg >= 0)
2404         {
2405         fprintf(stderr, "exim: incompatible arguments\n");
2406         return EXIT_FAILURE;
2407         }
2408
2409       continue_transport = argv[++i];
2410       continue_hostname = argv[++i];
2411       continue_host_address = argv[++i];
2412       continue_sequence = Uatoi(argv[++i]);
2413       msg_action = MSG_DELIVER;
2414       msg_action_arg = ++i;
2415       forced_delivery = TRUE;
2416       queue_run_pid = passed_qr_pid;
2417       queue_run_pipe = passed_qr_pipe;
2418
2419       if (!mac_ismsgid(argv[i]))
2420         {
2421         fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2422           argv[i]);
2423         return EXIT_FAILURE;
2424         }
2425
2426       /* Set up $sending_ip_address and $sending_port */
2427
2428       if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2429           &size) == 0)
2430         sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2431           &sending_port);
2432       else
2433         {
2434         fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2435           strerror(errno));
2436         return EXIT_FAILURE;
2437         }
2438
2439       if (running_in_test_harness) millisleep(500);
2440       break;
2441       }
2442
2443     /* -MCA: set the smtp_authenticated flag; this is useful only when it
2444     precedes -MC (see above). The flag indicates that the host to which
2445     Exim is connected has accepted an AUTH sequence. */
2446
2447     else if (Ustrcmp(argrest, "CA") == 0)
2448       {
2449       smtp_authenticated = TRUE;
2450       break;
2451       }
2452
2453     /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2454     it preceded -MC (see above) */
2455
2456     else if (Ustrcmp(argrest, "CP") == 0)
2457       {
2458       smtp_use_pipelining = TRUE;
2459       break;
2460       }
2461
2462     /* -MCQ: pass on the pid of the queue-running process that started
2463     this chain of deliveries and the fd of its synchronizing pipe; this
2464     is useful only when it precedes -MC (see above) */
2465
2466     else if (Ustrcmp(argrest, "CQ") == 0)
2467       {
2468       if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2469         else badarg = TRUE;
2470       if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2471         else badarg = TRUE;
2472       break;
2473       }
2474
2475     /* -MCS: set the smtp_use_size flag; this is useful only when it
2476     precedes -MC (see above) */
2477
2478     else if (Ustrcmp(argrest, "CS") == 0)
2479       {
2480       smtp_use_size = TRUE;
2481       break;
2482       }
2483
2484     /* -MCT: set the tls_offered flag; this is useful only when it
2485     precedes -MC (see above). The flag indicates that the host to which
2486     Exim is connected has offered TLS support. */
2487
2488     #ifdef SUPPORT_TLS
2489     else if (Ustrcmp(argrest, "CT") == 0)
2490       {
2491       tls_offered = TRUE;
2492       break;
2493       }
2494     #endif
2495
2496     /* -M[x]: various operations on the following list of message ids:
2497        -M    deliver the messages, ignoring next retry times and thawing
2498        -Mc   deliver the messages, checking next retry times, no thawing
2499        -Mf   freeze the messages
2500        -Mg   give up on the messages
2501        -Mt   thaw the messages
2502        -Mrm  remove the messages
2503     In the above cases, this must be the last option. There are also the
2504     following options which are followed by a single message id, and which
2505     act on that message. Some of them use the "recipient" addresses as well.
2506        -Mar  add recipient(s)
2507        -Mmad mark all recipients delivered
2508        -Mmd  mark recipients(s) delivered
2509        -Mes  edit sender
2510        -Mset load a message for use with -be
2511        -Mvb  show body
2512        -Mvc  show copy (of whole message, in RFC 2822 format)
2513        -Mvh  show header
2514        -Mvl  show log
2515     */
2516
2517     else if (*argrest == 0)
2518       {
2519       msg_action = MSG_DELIVER;
2520       forced_delivery = deliver_force_thaw = TRUE;
2521       }
2522     else if (Ustrcmp(argrest, "ar") == 0)
2523       {
2524       msg_action = MSG_ADD_RECIPIENT;
2525       one_msg_action = TRUE;
2526       }
2527     else if (Ustrcmp(argrest, "c") == 0)  msg_action = MSG_DELIVER;
2528     else if (Ustrcmp(argrest, "es") == 0)
2529       {
2530       msg_action = MSG_EDIT_SENDER;
2531       one_msg_action = TRUE;
2532       }
2533     else if (Ustrcmp(argrest, "f") == 0)  msg_action = MSG_FREEZE;
2534     else if (Ustrcmp(argrest, "g") == 0)
2535       {
2536       msg_action = MSG_DELIVER;
2537       deliver_give_up = TRUE;
2538       }
2539     else if (Ustrcmp(argrest, "mad") == 0)
2540       {
2541       msg_action = MSG_MARK_ALL_DELIVERED;
2542       }
2543     else if (Ustrcmp(argrest, "md") == 0)
2544       {
2545       msg_action = MSG_MARK_DELIVERED;
2546       one_msg_action = TRUE;
2547       }
2548     else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2549     else if (Ustrcmp(argrest, "set") == 0)
2550       {
2551       msg_action = MSG_LOAD;
2552       one_msg_action = TRUE;
2553       }
2554     else if (Ustrcmp(argrest, "t") == 0)  msg_action = MSG_THAW;
2555     else if (Ustrcmp(argrest, "vb") == 0)
2556       {
2557       msg_action = MSG_SHOW_BODY;
2558       one_msg_action = TRUE;
2559       }
2560     else if (Ustrcmp(argrest, "vc") == 0)
2561       {
2562       msg_action = MSG_SHOW_COPY;
2563       one_msg_action = TRUE;
2564       }
2565     else if (Ustrcmp(argrest, "vh") == 0)
2566       {
2567       msg_action = MSG_SHOW_HEADER;
2568       one_msg_action = TRUE;
2569       }
2570     else if (Ustrcmp(argrest, "vl") == 0)
2571       {
2572       msg_action = MSG_SHOW_LOG;
2573       one_msg_action = TRUE;
2574       }
2575     else { badarg = TRUE; break; }
2576
2577     /* All the -Mxx options require at least one message id. */
2578
2579     msg_action_arg = i + 1;
2580     if (msg_action_arg >= argc)
2581       {
2582       fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2583       return EXIT_FAILURE;
2584       }
2585
2586     /* Some require only message ids to follow */
2587
2588     if (!one_msg_action)
2589       {
2590       int j;
2591       for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2592         {
2593         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2594           argv[j], arg);
2595         return EXIT_FAILURE;
2596         }
2597       goto END_ARG;   /* Remaining args are ids */
2598       }
2599
2600     /* Others require only one message id, possibly followed by addresses,
2601     which will be handled as normal arguments. */
2602
2603     else
2604       {
2605       if (!mac_ismsgid(argv[msg_action_arg]))
2606         {
2607         fprintf(stderr, "exim: malformed message id %s after %s option\n",
2608           argv[msg_action_arg], arg);
2609         return EXIT_FAILURE;
2610         }
2611       i++;
2612       }
2613     break;
2614
2615
2616     /* Some programs seem to call the -om option without the leading o;
2617     for sendmail it askes for "me too". Exim always does this. */
2618
2619     case 'm':
2620     if (*argrest != 0) badarg = TRUE;
2621     break;
2622
2623
2624     /* -N: don't do delivery - a debugging option that stops transports doing
2625     their thing. It implies debugging at the D_v level. */
2626
2627     case 'N':
2628     if (*argrest == 0)
2629       {
2630       dont_deliver = TRUE;
2631       debug_selector |= D_v;
2632       debug_file = stderr;
2633       }
2634     else badarg = TRUE;
2635     break;
2636
2637
2638     /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2639     it. */
2640
2641     case 'n':
2642     break;
2643
2644     /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2645     option to the specified value. This form uses long names. We need to handle
2646     -O option=value and -Ooption=value. */
2647
2648     case 'O':
2649     if (*argrest == 0)
2650       {
2651       if (++i >= argc)
2652         {
2653         fprintf(stderr, "exim: string expected after -O\n");
2654         exit(EXIT_FAILURE);
2655         }
2656       }
2657     break;
2658
2659     case 'o':
2660
2661     /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2662     file" option). */
2663
2664     if (*argrest == 'A')
2665       {
2666       alias_arg = argrest + 1;
2667       if (alias_arg[0] == 0)
2668         {
2669         if (i+1 < argc) alias_arg = argv[++i]; else
2670           {
2671           fprintf(stderr, "exim: string expected after -oA\n");
2672           exit(EXIT_FAILURE);
2673           }
2674         }
2675       }
2676
2677     /* -oB: Set a connection message max value for remote deliveries */
2678
2679     else if (*argrest == 'B')
2680       {
2681       uschar *p = argrest + 1;
2682       if (p[0] == 0)
2683         {
2684         if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2685           {
2686           connection_max_messages = 1;
2687           p = NULL;
2688           }
2689         }
2690
2691       if (p != NULL)
2692         {
2693         if (!isdigit(*p))
2694           {
2695           fprintf(stderr, "exim: number expected after -oB\n");
2696           exit(EXIT_FAILURE);
2697           }
2698         connection_max_messages = Uatoi(p);
2699         }
2700       }
2701
2702     /* -odb: background delivery */
2703
2704     else if (Ustrcmp(argrest, "db") == 0)
2705       {
2706       synchronous_delivery = FALSE;
2707       arg_queue_only = FALSE;
2708       queue_only_set = TRUE;
2709       }
2710
2711     /* -odf: foreground delivery (smail-compatible option); same effect as
2712        -odi: interactive (synchronous) delivery (sendmail-compatible option)
2713     */
2714
2715     else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2716       {
2717       synchronous_delivery = TRUE;
2718       arg_queue_only = FALSE;
2719       queue_only_set = TRUE;
2720       }
2721
2722     /* -odq: queue only */
2723
2724     else if (Ustrcmp(argrest, "dq") == 0)
2725       {
2726       synchronous_delivery = FALSE;
2727       arg_queue_only = TRUE;
2728       queue_only_set = TRUE;
2729       }
2730
2731     /* -odqs: queue SMTP only - do local deliveries and remote routing,
2732     but no remote delivery */
2733
2734     else if (Ustrcmp(argrest, "dqs") == 0)
2735       {
2736       queue_smtp = TRUE;
2737       arg_queue_only = FALSE;
2738       queue_only_set = TRUE;
2739       }
2740
2741     /* -oex: Sendmail error flags. As these are also accepted without the
2742     leading -o prefix, for compatibility with vacation and other callers,
2743     they are handled with -e above. */
2744
2745     /* -oi:     Set flag so dot doesn't end non-SMTP input (same as -i)
2746        -oitrue: Another sendmail syntax for the same */
2747
2748     else if (Ustrcmp(argrest, "i") == 0 ||
2749              Ustrcmp(argrest, "itrue") == 0)
2750       dot_ends = FALSE;
2751
2752     /* -oM*: Set various characteristics for an incoming message; actually
2753     acted on for trusted callers only. */
2754
2755     else if (*argrest == 'M')
2756       {
2757       if (i+1 >= argc)
2758         {
2759         fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2760         exit(EXIT_FAILURE);
2761         }
2762
2763       /* -oMa: Set sender host address */
2764
2765       if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2766
2767       /* -oMaa: Set authenticator name */
2768
2769       else if (Ustrcmp(argrest, "Maa") == 0)
2770         sender_host_authenticated = argv[++i];
2771
2772       /* -oMas: setting authenticated sender */
2773
2774       else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2775
2776       /* -oMai: setting authenticated id */
2777
2778       else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2779
2780       /* -oMi: Set incoming interface address */
2781
2782       else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2783
2784       /* -oMr: Received protocol */
2785
2786       else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2787
2788       /* -oMs: Set sender host name */
2789
2790       else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2791
2792       /* -oMt: Set sender ident */
2793
2794       else if (Ustrcmp(argrest, "Mt") == 0)
2795         {
2796         sender_ident_set = TRUE;
2797         sender_ident = argv[++i];
2798         }
2799
2800       /* Else a bad argument */
2801
2802       else
2803         {
2804         badarg = TRUE;
2805         break;
2806         }
2807       }
2808
2809     /* -om: Me-too flag for aliases. Exim always does this. Some programs
2810     seem to call this as -m (undocumented), so that is also accepted (see
2811     above). */
2812
2813     else if (Ustrcmp(argrest, "m") == 0) {}
2814
2815     /* -oo: An ancient flag for old-style addresses which still seems to
2816     crop up in some calls (see in SCO). */
2817
2818     else if (Ustrcmp(argrest, "o") == 0) {}
2819
2820     /* -oP <name>: set pid file path for daemon */
2821
2822     else if (Ustrcmp(argrest, "P") == 0)
2823       override_pid_file_path = argv[++i];
2824
2825     /* -or <n>: set timeout for non-SMTP acceptance
2826        -os <n>: set timeout for SMTP acceptance */
2827
2828     else if (*argrest == 'r' || *argrest == 's')
2829       {
2830       int *tp = (*argrest == 'r')?
2831         &arg_receive_timeout : &arg_smtp_receive_timeout;
2832       if (argrest[1] == 0)
2833         {
2834         if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2835         }
2836       else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2837       if (*tp < 0)
2838         {
2839         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2840         exit(EXIT_FAILURE);
2841         }
2842       }
2843
2844     /* -oX <list>: Override local_interfaces and/or default daemon ports */
2845
2846     else if (Ustrcmp(argrest, "X") == 0)
2847       override_local_interfaces = argv[++i];
2848
2849     /* Unknown -o argument */
2850
2851     else badarg = TRUE;
2852     break;
2853
2854
2855     /* -ps: force Perl startup; -pd force delayed Perl startup */
2856
2857     case 'p':
2858     #ifdef EXIM_PERL
2859     if (*argrest == 's' && argrest[1] == 0)
2860       {
2861       perl_start_option = 1;
2862       break;
2863       }
2864     if (*argrest == 'd' && argrest[1] == 0)
2865       {
2866       perl_start_option = -1;
2867       break;
2868       }
2869     #endif
2870
2871     /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2872     which sets the host protocol and host name */
2873
2874     if (*argrest == 0)
2875       {
2876       if (i+1 < argc) argrest = argv[++i]; else
2877         { badarg = TRUE; break; }
2878       }
2879
2880     if (*argrest != 0)
2881       {
2882       uschar *hn = Ustrchr(argrest, ':');
2883       if (hn == NULL)
2884         {
2885         received_protocol = argrest;
2886         }
2887       else
2888         {
2889         received_protocol = string_copyn(argrest, hn - argrest);
2890         sender_host_name = hn + 1;
2891         }
2892       }
2893     break;
2894
2895
2896     case 'q':
2897     receiving_message = FALSE;
2898     if (queue_interval >= 0)
2899       {
2900       fprintf(stderr, "exim: -q specified more than once\n");
2901       exit(EXIT_FAILURE);
2902       }
2903
2904     /* -qq...: Do queue runs in a 2-stage manner */
2905
2906     if (*argrest == 'q')
2907       {
2908       queue_2stage = TRUE;
2909       argrest++;
2910       }
2911
2912     /* -qi...: Do only first (initial) deliveries */
2913
2914     if (*argrest == 'i')
2915       {
2916       queue_run_first_delivery = TRUE;
2917       argrest++;
2918       }
2919
2920     /* -qf...: Run the queue, forcing deliveries
2921        -qff..: Ditto, forcing thawing as well */
2922
2923     if (*argrest == 'f')
2924       {
2925       queue_run_force = TRUE;
2926       if (*(++argrest) == 'f')
2927         {
2928         deliver_force_thaw = TRUE;
2929         argrest++;
2930         }
2931       }
2932
2933     /* -q[f][f]l...: Run the queue only on local deliveries */
2934
2935     if (*argrest == 'l')
2936       {
2937       queue_run_local = TRUE;
2938       argrest++;
2939       }
2940
2941     /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2942     optionally starting from a given message id. */
2943
2944     if (*argrest == 0 &&
2945         (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2946       {
2947       queue_interval = 0;
2948       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2949         start_queue_run_id = argv[++i];
2950       if (i+1 < argc && mac_ismsgid(argv[i+1]))
2951         stop_queue_run_id = argv[++i];
2952       }
2953
2954     /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2955     optionally local only. */
2956
2957     else
2958       {
2959       if (*argrest != 0)
2960         queue_interval = readconf_readtime(argrest, 0, FALSE);
2961       else
2962         queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2963       if (queue_interval <= 0)
2964         {
2965         fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2966         exit(EXIT_FAILURE);
2967         }
2968       }
2969     break;
2970
2971
2972     case 'R':   /* Synonymous with -qR... */
2973     receiving_message = FALSE;
2974
2975     /* -Rf:   As -R (below) but force all deliveries,
2976        -Rff:  Ditto, but also thaw all frozen messages,
2977        -Rr:   String is regex
2978        -Rrf:  Regex and force
2979        -Rrff: Regex and force and thaw
2980
2981     in all cases provided there are no further characters in this
2982     argument. */
2983
2984     if (*argrest != 0)
2985       {
2986       int i;
2987       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2988         {
2989         if (Ustrcmp(argrest, rsopts[i]) == 0)
2990           {
2991           if (i != 2) queue_run_force = TRUE;
2992           if (i >= 2) deliver_selectstring_regex = TRUE;
2993           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2994           argrest += Ustrlen(rsopts[i]);
2995           }
2996         }
2997       }
2998
2999     /* -R: Set string to match in addresses for forced queue run to
3000     pick out particular messages. */
3001
3002     if (*argrest == 0)
3003       {
3004       if (i+1 < argc) deliver_selectstring = argv[++i]; else
3005         {
3006         fprintf(stderr, "exim: string expected after -R\n");
3007         exit(EXIT_FAILURE);
3008         }
3009       }
3010     else deliver_selectstring = argrest;
3011     break;
3012
3013
3014     /* -r: an obsolete synonym for -f (see above) */
3015
3016
3017     /* -S: Like -R but works on sender. */
3018
3019     case 'S':   /* Synonymous with -qS... */
3020     receiving_message = FALSE;
3021
3022     /* -Sf:   As -S (below) but force all deliveries,
3023        -Sff:  Ditto, but also thaw all frozen messages,
3024        -Sr:   String is regex
3025        -Srf:  Regex and force
3026        -Srff: Regex and force and thaw
3027
3028     in all cases provided there are no further characters in this
3029     argument. */
3030
3031     if (*argrest != 0)
3032       {
3033       int i;
3034       for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3035         {
3036         if (Ustrcmp(argrest, rsopts[i]) == 0)
3037           {
3038           if (i != 2) queue_run_force = TRUE;
3039           if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3040           if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3041           argrest += Ustrlen(rsopts[i]);
3042           }
3043         }
3044       }
3045
3046     /* -S: Set string to match in addresses for forced queue run to
3047     pick out particular messages. */
3048
3049     if (*argrest == 0)
3050       {
3051       if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3052         {
3053         fprintf(stderr, "exim: string expected after -S\n");
3054         exit(EXIT_FAILURE);
3055         }
3056       }
3057     else deliver_selectstring_sender = argrest;
3058     break;
3059
3060     /* -Tqt is an option that is exclusively for use by the testing suite.
3061     It is not recognized in other circumstances. It allows for the setting up
3062     of explicit "queue times" so that various warning/retry things can be
3063     tested. Otherwise variability of clock ticks etc. cause problems. */
3064
3065     case 'T':
3066     if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3067       fudged_queue_times = argv[++i];
3068     else badarg = TRUE;
3069     break;
3070
3071
3072     /* -t: Set flag to extract recipients from body of message. */
3073
3074     case 't':
3075     if (*argrest == 0) extract_recipients = TRUE;
3076
3077     /* -ti: Set flag to extract recipients from body of message, and also
3078     specify that dot does not end the message. */
3079
3080     else if (Ustrcmp(argrest, "i") == 0)
3081       {
3082       extract_recipients = TRUE;
3083       dot_ends = FALSE;
3084       }
3085
3086     /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3087
3088     #ifdef SUPPORT_TLS
3089     else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3090     #endif
3091
3092     else badarg = TRUE;
3093     break;
3094
3095
3096     /* -U: This means "initial user submission" in sendmail, apparently. The
3097     doc claims that in future sendmail may refuse syntactically invalid
3098     messages instead of fixing them. For the moment, we just ignore it. */
3099
3100     case 'U':
3101     break;
3102
3103
3104     /* -v: verify things - this is a very low-level debugging */
3105
3106     case 'v':
3107     if (*argrest == 0)
3108       {
3109       debug_selector |= D_v;
3110       debug_file = stderr;
3111       }
3112     else badarg = TRUE;
3113     break;
3114
3115
3116     /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3117
3118       The -x flag tells the sendmail command that mail from a local
3119       mail program has National Language Support (NLS) extended characters
3120       in the body of the mail item. The sendmail command can send mail with
3121       extended NLS characters across networks that normally corrupts these
3122       8-bit characters.
3123
3124     As Exim is 8-bit clean, it just ignores this flag. */
3125
3126     case 'x':
3127     if (*argrest != 0) badarg = TRUE;
3128     break;
3129
3130     /* All other initial characters are errors */
3131
3132     default:
3133     badarg = TRUE;
3134     break;
3135     }         /* End of high-level switch statement */
3136
3137   /* Failed to recognize the option, or syntax error */
3138
3139   if (badarg)
3140     {
3141     fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3142       "option %s\n", arg);
3143     exit(EXIT_FAILURE);
3144     }
3145   }
3146
3147
3148 /* If -R or -S have been specified without -q, assume a single queue run. */
3149
3150 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3151   queue_interval < 0) queue_interval = 0;
3152
3153
3154 END_ARG:
3155 /* If usage_wanted is set we call the usage function - which never returns */
3156 if (usage_wanted) exim_usage(called_as);
3157
3158 /* Arguments have been processed. Check for incompatibilities. */
3159 if ((
3160     (smtp_input || extract_recipients || recipients_arg < argc) &&
3161     (daemon_listen || queue_interval >= 0 || bi_option ||
3162       test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3163       filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3164     ) ||
3165     (
3166     msg_action_arg > 0 &&
3167     (daemon_listen || queue_interval >= 0 || list_options ||
3168       (checking && msg_action != MSG_LOAD) ||
3169       bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3170     ) ||
3171     (
3172     (daemon_listen || queue_interval >= 0) &&
3173     (sender_address != NULL || list_options || list_queue || checking ||
3174       bi_option)
3175     ) ||
3176     (
3177     daemon_listen && queue_interval == 0
3178     ) ||
3179     (
3180     list_options &&
3181     (checking || smtp_input || extract_recipients ||
3182       filter_test != FTEST_NONE || bi_option)
3183     ) ||
3184     (
3185     verify_address_mode &&
3186     (address_test_mode || smtp_input || extract_recipients ||
3187       filter_test != FTEST_NONE || bi_option)
3188     ) ||
3189     (
3190     address_test_mode && (smtp_input || extract_recipients ||
3191       filter_test != FTEST_NONE || bi_option)
3192     ) ||
3193     (
3194     smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3195       extract_recipients)
3196     ) ||
3197     (
3198     deliver_selectstring != NULL && queue_interval < 0
3199     ) ||
3200     (
3201     msg_action == MSG_LOAD &&
3202       (!expansion_test || expansion_test_message != NULL)
3203     )
3204    )
3205   {
3206   fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3207   exit(EXIT_FAILURE);
3208   }
3209
3210 /* If debugging is set up, set the file and the file descriptor to pass on to
3211 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3212 to run in the foreground. */
3213
3214 if (debug_selector != 0)
3215   {
3216   debug_file = stderr;
3217   debug_fd = fileno(debug_file);
3218   background_daemon = FALSE;
3219   if (running_in_test_harness) millisleep(100);   /* lets caller finish */
3220   if (debug_selector != D_v)    /* -v only doesn't show this */
3221     {
3222     debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3223       version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3224       debug_selector);
3225     if (!version_printed)
3226       show_whats_supported(stderr);
3227     }
3228   }
3229
3230 /* When started with root privilege, ensure that the limits on the number of
3231 open files and the number of processes (where that is accessible) are
3232 sufficiently large, or are unset, in case Exim has been called from an
3233 environment where the limits are screwed down. Not all OS have the ability to
3234 change some of these limits. */
3235
3236 if (unprivileged)
3237   {
3238   DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3239   }
3240 else
3241   {
3242   struct rlimit rlp;
3243
3244   #ifdef RLIMIT_NOFILE
3245   if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3246     {
3247     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3248       strerror(errno));
3249     rlp.rlim_cur = rlp.rlim_max = 0;
3250     }
3251
3252   /* I originally chose 1000 as a nice big number that was unlikely to
3253   be exceeded. It turns out that some older OS have a fixed upper limit of
3254   256. */
3255
3256   if (rlp.rlim_cur < 1000)
3257     {
3258     rlp.rlim_cur = rlp.rlim_max = 1000;
3259     if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3260       {
3261       rlp.rlim_cur = rlp.rlim_max = 256;
3262       if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3263         log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3264           strerror(errno));
3265       }
3266     }
3267   #endif
3268
3269   #ifdef RLIMIT_NPROC
3270   if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3271     {
3272     log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3273       strerror(errno));
3274     rlp.rlim_cur = rlp.rlim_max = 0;
3275     }
3276
3277   #ifdef RLIM_INFINITY
3278   if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3279     {
3280     rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3281   #else
3282   if (rlp.rlim_cur < 1000)
3283     {
3284     rlp.rlim_cur = rlp.rlim_max = 1000;
3285   #endif
3286     if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3287       log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3288         strerror(errno));
3289     }
3290   #endif
3291   }
3292
3293 /* Exim is normally entered as root (but some special configurations are
3294 possible that don't do this). However, it always spins off sub-processes that
3295 set their uid and gid as required for local delivery. We don't want to pass on
3296 any extra groups that root may belong to, so we want to get rid of them all at
3297 this point.
3298
3299 We need to obey setgroups() at this stage, before possibly giving up root
3300 privilege for a changed configuration file, but later on we might need to
3301 check on the additional groups for the admin user privilege - can't do that
3302 till after reading the config, which might specify the exim gid. Therefore,
3303 save the group list here first. */
3304
3305 group_count = getgroups(NGROUPS_MAX, group_list);
3306 if (group_count < 0)
3307   {
3308   fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3309   exit(EXIT_FAILURE);
3310   }
3311
3312 /* There is a fundamental difference in some BSD systems in the matter of
3313 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3314 known not to be different. On the "different" systems there is a single group
3315 list, and the first entry in it is the current group. On all other versions of
3316 Unix there is a supplementary group list, which is in *addition* to the current
3317 group. Consequently, to get rid of all extraneous groups on a "standard" system
3318 you pass over 0 groups to setgroups(), while on a "different" system you pass
3319 over a single group - the current group, which is always the first group in the
3320 list. Calling setgroups() with zero groups on a "different" system results in
3321 an error return. The following code should cope with both types of system.
3322
3323 However, if this process isn't running as root, setgroups() can't be used
3324 since you have to be root to run it, even if throwing away groups. Not being
3325 root here happens only in some unusual configurations. We just ignore the
3326 error. */
3327
3328 if (setgroups(0, NULL) != 0)
3329   {
3330   if (setgroups(1, group_list) != 0 && !unprivileged)
3331     {
3332     fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3333     exit(EXIT_FAILURE);
3334     }
3335   }
3336
3337 /* If the configuration file name has been altered by an argument on the
3338 command line (either a new file name or a macro definition) and the caller is
3339 not root, or if this is a filter testing run, remove any setuid privilege the
3340 program has and run as the underlying user.
3341
3342 The exim user is locked out of this, which severely restricts the use of -C
3343 for some purposes.
3344
3345 Otherwise, set the real ids to the effective values (should be root unless run
3346 from inetd, which it can either be root or the exim uid, if one is configured).
3347
3348 There is a private mechanism for bypassing some of this, in order to make it
3349 possible to test lots of configurations automatically, without having either to
3350 recompile each time, or to patch in an actual configuration file name and other
3351 values (such as the path name). If running in the test harness, pretend that
3352 configuration file changes and macro definitions haven't happened. */
3353
3354 if ((                                            /* EITHER */
3355     (!trusted_config ||                          /* Config changed, or */
3356      !macros_trusted()) &&                       /*  impermissible macros and */
3357     real_uid != root_uid &&                      /* Not root, and */
3358     !running_in_test_harness                     /* Not fudged */
3359     ) ||                                         /*   OR   */
3360     expansion_test                               /* expansion testing */
3361     ||                                           /*   OR   */
3362     filter_test != FTEST_NONE)                   /* Filter testing */
3363   {
3364   setgroups(group_count, group_list);
3365   exim_setugid(real_uid, real_gid, FALSE,
3366     US"-C, -D, -be or -bf forces real uid");
3367   removed_privilege = TRUE;
3368
3369   /* In the normal case when Exim is called like this, stderr is available
3370   and should be used for any logging information because attempts to write
3371   to the log will usually fail. To arrange this, we unset really_exim. However,
3372   if no stderr is available there is no point - we might as well have a go
3373   at the log (if it fails, syslog will be written).
3374
3375   Note that if the invoker is Exim, the logs remain available. Messing with
3376   this causes unlogged successful deliveries.  */
3377
3378   if ((log_stderr != NULL) && (real_uid != exim_uid))
3379     really_exim = FALSE;
3380   }
3381
3382 /* Privilege is to be retained for the moment. It may be dropped later,
3383 depending on the job that this Exim process has been asked to do. For now, set
3384 the real uid to the effective so that subsequent re-execs of Exim are done by a
3385 privileged user. */
3386
3387 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3388
3389 /* If testing a filter, open the file(s) now, before wasting time doing other
3390 setups and reading the message. */
3391
3392 if ((filter_test & FTEST_SYSTEM) != 0)
3393   {
3394   filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3395   if (filter_sfd < 0)
3396     {
3397     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3398       strerror(errno));
3399     return EXIT_FAILURE;
3400     }
3401   }
3402
3403 if ((filter_test & FTEST_USER) != 0)
3404   {
3405   filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3406   if (filter_ufd < 0)
3407     {
3408     fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3409       strerror(errno));
3410     return EXIT_FAILURE;
3411     }
3412   }
3413
3414 /* Read the main runtime configuration data; this gives up if there
3415 is a failure. It leaves the configuration file open so that the subsequent
3416 configuration data for delivery can be read if needed. */
3417
3418 readconf_main();
3419
3420 /* Handle the decoding of logging options. */
3421
3422 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3423   log_selector_string, log_options, log_options_count, US"log", 0);
3424
3425 DEBUG(D_any)
3426   {
3427   debug_printf("configuration file is %s\n", config_main_filename);
3428   debug_printf("log selectors = %08x %08x\n", log_write_selector,
3429     log_extra_selector);
3430   }
3431
3432 /* If domain literals are not allowed, check the sender address that was
3433 supplied with -f. Ditto for a stripped trailing dot. */
3434
3435 if (sender_address != NULL)
3436   {
3437   if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3438     {
3439     fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3440       "allowed\n", sender_address);
3441     return EXIT_FAILURE;
3442     }
3443   if (f_end_dot && !strip_trailing_dot)
3444     {
3445     fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3446       "(trailing dot not allowed)\n", sender_address);
3447     return EXIT_FAILURE;
3448     }
3449   }
3450
3451 /* Paranoia check of maximum lengths of certain strings. There is a check
3452 on the length of the log file path in log.c, which will come into effect
3453 if there are any calls to write the log earlier than this. However, if we
3454 get this far but the string is very long, it is better to stop now than to
3455 carry on and (e.g.) receive a message and then have to collapse. The call to
3456 log_write() from here will cause the ultimate panic collapse if the complete
3457 file name exceeds the buffer length. */
3458
3459 if (Ustrlen(log_file_path) > 200)
3460   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3461     "log_file_path is longer than 200 chars: aborting");
3462
3463 if (Ustrlen(pid_file_path) > 200)
3464   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3465     "pid_file_path is longer than 200 chars: aborting");
3466
3467 if (Ustrlen(spool_directory) > 200)
3468   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3469     "spool_directory is longer than 200 chars: aborting");
3470
3471 /* Length check on the process name given to syslog for its TAG field,
3472 which is only permitted to be 32 characters or less. See RFC 3164. */
3473
3474 if (Ustrlen(syslog_processname) > 32)
3475   log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3476     "syslog_processname is longer than 32 chars: aborting");
3477
3478 /* In some operating systems, the environment variable TMPDIR controls where
3479 temporary files are created; Exim doesn't use these (apart from when delivering
3480 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3481 If TMPDIR is found in the environment, reset it to the value defined in the
3482 TMPDIR macro, if this macro is defined. */
3483
3484 #ifdef TMPDIR
3485   {
3486   uschar **p;
3487   for (p = USS environ; *p != NULL; p++)
3488     {
3489     if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3490         Ustrcmp(*p+7, TMPDIR) != 0)
3491       {
3492       uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3493       sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3494       *p = newp;
3495       DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3496       }
3497     }
3498   }
3499 #endif
3500
3501 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3502 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3503 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3504 called by a user who has set the TZ variable. This then affects the timestamps
3505 in log files and in Received: headers, and any created Date: header lines. The
3506 required timezone is settable in the configuration file, so nothing can be done
3507 about this earlier - but hopefully nothing will normally be logged earlier than
3508 this. We have to make a new environment if TZ is wrong, but don't bother if
3509 timestamps_utc is set, because then all times are in UTC anyway. */
3510
3511 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3512   {
3513   timestamps_utc = TRUE;
3514   }
3515 else
3516   {
3517   uschar *envtz = US getenv("TZ");
3518   if ((envtz == NULL && timezone_string != NULL) ||
3519       (envtz != NULL &&
3520         (timezone_string == NULL ||
3521          Ustrcmp(timezone_string, envtz) != 0)))
3522     {
3523     uschar **p = USS environ;
3524     uschar **new;
3525     uschar **newp;
3526     int count = 0;
3527     while (*p++ != NULL) count++;
3528     if (envtz == NULL) count++;
3529     newp = new = malloc(sizeof(uschar *) * (count + 1));
3530     for (p = USS environ; *p != NULL; p++)
3531       {
3532       if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3533       *newp++ = *p;
3534       }
3535     if (timezone_string != NULL)
3536       {
3537       *newp = malloc(Ustrlen(timezone_string) + 4);
3538       sprintf(CS *newp++, "TZ=%s", timezone_string);
3539       }
3540     *newp = NULL;
3541     environ = CSS new;
3542     tzset();
3543     DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3544       tod_stamp(tod_log));
3545     }
3546   }
3547
3548 /* Handle the case when we have removed the setuid privilege because of -C or
3549 -D. This means that the caller of Exim was not root.
3550
3551 There is a problem if we were running as the Exim user. The sysadmin may
3552 expect this case to retain privilege because "the binary was called by the
3553 Exim user", but it hasn't, because either the -D option set macros, or the
3554 -C option set a non-trusted configuration file. There are two possibilities:
3555
3556   (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3557       to do message deliveries. Thus, the fact that it is running as a
3558       non-privileged user is plausible, and might be wanted in some special
3559       configurations. However, really_exim will have been set false when
3560       privilege was dropped, to stop Exim trying to write to its normal log
3561       files. Therefore, re-enable normal log processing, assuming the sysadmin
3562       has set up the log directory correctly.
3563
3564   (2) If deliver_drop_privilege is not set, the configuration won't work as
3565       apparently intended, and so we log a panic message. In order to retain
3566       root for -C or -D, the caller must either be root or be invoking a
3567       trusted configuration file (when deliver_drop_privilege is false). */
3568
3569 if (removed_privilege && (!trusted_config || macros != NULL) &&
3570     real_uid == exim_uid)
3571   {
3572   if (deliver_drop_privilege)
3573     really_exim = TRUE; /* let logging work normally */
3574   else
3575     log_write(0, LOG_MAIN|LOG_PANIC,
3576       "exim user lost privilege for using %s option",
3577       trusted_config? "-D" : "-C");
3578   }
3579
3580 /* Start up Perl interpreter if Perl support is configured and there is a
3581 perl_startup option, and the configuration or the command line specifies
3582 initializing starting. Note that the global variables are actually called
3583 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3584
3585 #ifdef EXIM_PERL
3586 if (perl_start_option != 0)
3587   opt_perl_at_start = (perl_start_option > 0);
3588 if (opt_perl_at_start && opt_perl_startup != NULL)
3589   {
3590   uschar *errstr;
3591   DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3592   errstr = init_perl(opt_perl_startup);
3593   if (errstr != NULL)
3594     {
3595     fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3596     return EXIT_FAILURE;
3597     }
3598   opt_perl_started = TRUE;
3599   }
3600 #endif /* EXIM_PERL */
3601
3602 /* Initialise lookup_list
3603 If debugging, already called above via version reporting.
3604 This does mean that debugging causes the list to be initialised while root.
3605 This *should* be harmless -- all modules are loaded from a fixed dir and
3606 it's code that would, if not a module, be part of Exim already. */
3607 init_lookup_list();
3608
3609 /* Log the arguments of the call if the configuration file said so. This is
3610 a debugging feature for finding out what arguments certain MUAs actually use.
3611 Don't attempt it if logging is disabled, or if listing variables or if
3612 verifying/testing addresses or expansions. */
3613
3614 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3615       && really_exim && !list_options && !checking)
3616   {
3617   int i;
3618   uschar *p = big_buffer;
3619   Ustrcpy(p, "cwd=");
3620   (void)getcwd(CS p+4, big_buffer_size - 4);
3621   while (*p) p++;
3622   (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3623   while (*p) p++;
3624   for (i = 0; i < argc; i++)
3625     {
3626     int len = Ustrlen(argv[i]);
3627     uschar *printing;
3628     uschar *quote;
3629     if (p + len + 8 >= big_buffer + big_buffer_size)
3630       {
3631       Ustrcpy(p, " ...");
3632       log_write(0, LOG_MAIN, "%s", big_buffer);
3633       Ustrcpy(big_buffer, "...");
3634       p = big_buffer + 3;
3635       }
3636     printing = string_printing(argv[i]);
3637     if (printing[0] == 0) quote = US"\""; else
3638       {
3639       uschar *pp = printing;
3640       quote = US"";
3641       while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3642       }
3643     sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3644       (p - big_buffer) - 4), printing, quote);
3645     while (*p) p++;
3646     }
3647
3648   if ((log_extra_selector & LX_arguments) != 0)
3649     log_write(0, LOG_MAIN, "%s", big_buffer);
3650   else
3651     debug_printf("%s\n", big_buffer);
3652   }
3653
3654 /* Set the working directory to be the top-level spool directory. We don't rely
3655 on this in the code, which always uses fully qualified names, but it's useful
3656 for core dumps etc. Don't complain if it fails - the spool directory might not
3657 be generally accessible and calls with the -C option (and others) have lost
3658 privilege by now. Before the chdir, we try to ensure that the directory exists.
3659 */
3660
3661 if (Uchdir(spool_directory) != 0)
3662   {
3663   (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3664   (void)Uchdir(spool_directory);
3665   }
3666
3667 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3668 alias file. Exim doesn't have such a concept, but this call is screwed into
3669 Sun's YP makefiles. Handle this by calling a configured script, as the real
3670 user who called Exim. The -oA option can be used to pass an argument to the
3671 script. */
3672
3673 if (bi_option)
3674   {
3675   (void)fclose(config_file);
3676   if (bi_command != NULL)
3677     {
3678     int i = 0;
3679     uschar *argv[3];
3680     argv[i++] = bi_command;
3681     if (alias_arg != NULL) argv[i++] = alias_arg;
3682     argv[i++] = NULL;
3683
3684     setgroups(group_count, group_list);
3685     exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3686
3687     DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3688       (argv[1] == NULL)? US"" : argv[1]);
3689
3690     execv(CS argv[0], (char *const *)argv);
3691     fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3692     exit(EXIT_FAILURE);
3693     }
3694   else
3695     {
3696     DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3697     exit(EXIT_SUCCESS);
3698     }
3699   }
3700
3701 /* If an action on specific messages is requested, or if a daemon or queue
3702 runner is being started, we need to know if Exim was called by an admin user.
3703 This is the case if the real user is root or exim, or if the real group is
3704 exim, or if one of the supplementary groups is exim or a group listed in
3705 admin_groups. We don't fail all message actions immediately if not admin_user,
3706 since some actions can be performed by non-admin users. Instead, set admin_user
3707 for later interrogation. */
3708
3709 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3710   admin_user = TRUE;
3711 else
3712   {
3713   int i, j;
3714   for (i = 0; i < group_count; i++)
3715     {
3716     if (group_list[i] == exim_gid) admin_user = TRUE;
3717     else if (admin_groups != NULL)
3718       {
3719       for (j = 1; j <= (int)(admin_groups[0]); j++)
3720         if (admin_groups[j] == group_list[i])
3721           { admin_user = TRUE; break; }
3722       }
3723     if (admin_user) break;
3724     }
3725   }
3726
3727 /* Another group of privileged users are the trusted users. These are root,
3728 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3729 are permitted to specify sender_addresses with -f on the command line, and
3730 other message parameters as well. */
3731
3732 if (real_uid == root_uid || real_uid == exim_uid)
3733   trusted_caller = TRUE;
3734 else
3735   {
3736   int i, j;
3737
3738   if (trusted_users != NULL)
3739     {
3740     for (i = 1; i <= (int)(trusted_users[0]); i++)
3741       if (trusted_users[i] == real_uid)
3742         { trusted_caller = TRUE; break; }
3743     }
3744
3745   if (!trusted_caller && trusted_groups != NULL)
3746     {
3747     for (i = 1; i <= (int)(trusted_groups[0]); i++)
3748       {
3749       if (trusted_groups[i] == real_gid)
3750         trusted_caller = TRUE;
3751       else for (j = 0; j < group_count; j++)
3752         {
3753         if (trusted_groups[i] == group_list[j])
3754           { trusted_caller = TRUE; break; }
3755         }
3756       if (trusted_caller) break;
3757       }
3758     }
3759   }
3760
3761 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3762 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3763
3764 /* Only an admin user may start the daemon or force a queue run in the default
3765 configuration, but the queue run restriction can be relaxed. Only an admin
3766 user may request that a message be returned to its sender forthwith. Only an
3767 admin user may specify a debug level greater than D_v (because it might show
3768 passwords, etc. in lookup queries). Only an admin user may request a queue
3769 count. Only an admin user can use the test interface to scan for email
3770 (because Exim will be in the spool dir and able to look at mails). */
3771
3772 if (!admin_user)
3773   {
3774   BOOL debugset = (debug_selector & ~D_v) != 0;
3775   if (deliver_give_up || daemon_listen || malware_test_file ||
3776      (count_queue && queue_list_requires_admin) ||
3777      (list_queue && queue_list_requires_admin) ||
3778      (queue_interval >= 0 && prod_requires_admin) ||
3779      (debugset && !running_in_test_harness))
3780     {
3781     fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3782     exit(EXIT_FAILURE);
3783     }
3784   }
3785
3786 /* If the real user is not root or the exim uid, the argument for passing
3787 in an open TCP/IP connection for another message is not permitted, nor is
3788 running with the -N option for any delivery action, unless this call to exim is
3789 one that supplied an input message, or we are using a patched exim for
3790 regression testing. */
3791
3792 if (real_uid != root_uid && real_uid != exim_uid &&
3793      (continue_hostname != NULL ||
3794        (dont_deliver &&
3795          (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3796        )) && !running_in_test_harness)
3797   {
3798   fprintf(stderr, "exim: Permission denied\n");
3799   return EXIT_FAILURE;
3800   }
3801
3802 /* If the caller is not trusted, certain arguments are ignored when running for
3803 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3804 Note that authority for performing certain actions on messages is tested in the
3805 queue_action() function. */
3806
3807 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3808   {
3809   sender_host_name = sender_host_address = interface_address =
3810     sender_ident = received_protocol = NULL;
3811   sender_host_port = interface_port = 0;
3812   sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3813   }
3814
3815 /* If a sender host address is set, extract the optional port number off the
3816 end of it and check its syntax. Do the same thing for the interface address.
3817 Exim exits if the syntax is bad. */
3818
3819 else
3820   {
3821   if (sender_host_address != NULL)
3822     sender_host_port = check_port(sender_host_address);
3823   if (interface_address != NULL)
3824     interface_port = check_port(interface_address);
3825   }
3826
3827 /* If an SMTP message is being received check to see if the standard input is a
3828 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3829 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3830 barf. */
3831
3832 if (smtp_input)
3833   {
3834   union sockaddr_46 inetd_sock;
3835   EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3836   if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3837     {
3838     int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3839     if (family == AF_INET || family == AF_INET6)
3840       {
3841       union sockaddr_46 interface_sock;
3842       size = sizeof(interface_sock);
3843
3844       if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3845         interface_address = host_ntoa(-1, &interface_sock, NULL,
3846           &interface_port);
3847
3848       if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3849
3850       if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3851         {
3852         is_inetd = TRUE;
3853         sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3854           NULL, &sender_host_port);
3855         if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3856           "inetd is not supported when mua_wrapper is set");
3857         }
3858       else
3859         {
3860         fprintf(stderr,
3861           "exim: Permission denied (unprivileged user, unprivileged port)\n");
3862         return EXIT_FAILURE;
3863         }
3864       }
3865     }
3866   }
3867
3868 /* If the load average is going to be needed while receiving a message, get it
3869 now for those OS that require the first call to os_getloadavg() to be done as
3870 root. There will be further calls later for each message received. */
3871
3872 #ifdef LOAD_AVG_NEEDS_ROOT
3873 if (receiving_message &&
3874       (queue_only_load >= 0 ||
3875         (is_inetd && smtp_load_reserve >= 0)
3876       ))
3877   {
3878   load_average = OS_GETLOADAVG();
3879   }
3880 #endif
3881
3882 /* The queue_only configuration option can be overridden by -odx on the command
3883 line, except that if queue_only_override is false, queue_only cannot be unset
3884 from the command line. */
3885
3886 if (queue_only_set && (queue_only_override || arg_queue_only))
3887   queue_only = arg_queue_only;
3888
3889 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3890 -or and -os. */
3891
3892 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3893 if (arg_smtp_receive_timeout >= 0)
3894   smtp_receive_timeout = arg_smtp_receive_timeout;
3895
3896 /* If Exim was started with root privilege, unless we have already removed the
3897 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3898 except when starting the daemon or doing some kind of delivery or address
3899 testing (-bt). These are the only cases when root need to be retained. We run
3900 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3901 retained only for starting the daemon. We always do the initgroups() in this
3902 situation (controlled by the TRUE below), in order to be as close as possible
3903 to the state Exim usually runs in. */
3904
3905 if (!unprivileged &&                      /* originally had root AND */
3906     !removed_privilege &&                 /* still got root AND      */
3907     !daemon_listen &&                     /* not starting the daemon */
3908     queue_interval <= 0 &&                /* (either kind of daemon) */
3909       (                                   /*    AND EITHER           */
3910       deliver_drop_privilege ||           /* requested unprivileged  */
3911         (                                 /*       OR                */
3912         queue_interval < 0 &&             /* not running the queue   */
3913         (msg_action_arg < 0 ||            /*       and               */
3914           msg_action != MSG_DELIVER) &&   /* not delivering and      */
3915         (!checking || !address_test_mode) /* not address checking    */
3916         )
3917       ))
3918   {
3919   exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3920   }
3921
3922 /* When we are retaining a privileged uid, we still change to the exim gid. */
3923
3924 else
3925   {
3926   int rv;
3927   rv = setgid(exim_gid);
3928   /* Impact of failure is that some stuff might end up with an incorrect group.
3929   We track this for failures from root, since any attempt to change privilege
3930   by root should succeed and failures should be examined.  For non-root,
3931   there's no security risk.  For me, it's { exim -bV } on a just-built binary,
3932   no need to complain then. */
3933   if (rv == -1)
3934     {
3935     if (!(unprivileged || removed_privilege))
3936       {
3937       fprintf(stderr,
3938           "exim: changing group failed: %s\n", strerror(errno));
3939       exit(EXIT_FAILURE);
3940       }
3941     else
3942       DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
3943           (long int)exim_gid, strerror(errno));
3944     }
3945   }
3946
3947 /* Handle a request to scan a file for malware */
3948 if (malware_test_file)
3949   {
3950 #ifdef WITH_CONTENT_SCAN
3951   int result;
3952   set_process_info("scanning file for malware");
3953   result = malware_in_file(malware_test_file);
3954   if (result == FAIL)
3955     {
3956     printf("No malware found.\n");
3957     exit(EXIT_SUCCESS);
3958     }
3959   if (result != OK)
3960     {
3961     printf("Malware lookup returned non-okay/fail: %d\n", result);
3962     exit(EXIT_FAILURE);
3963     }
3964   if (malware_name)
3965     printf("Malware found: %s\n", malware_name);
3966   else
3967     printf("Malware scan detected malware of unknown name.\n");
3968 #else
3969   printf("Malware scanning not enabled at compile time.\n");
3970 #endif
3971   exit(EXIT_FAILURE);
3972   }
3973
3974 /* Handle a request to list the delivery queue */
3975
3976 if (list_queue)
3977   {
3978   set_process_info("listing the queue");
3979   queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3980   exit(EXIT_SUCCESS);
3981   }
3982
3983 /* Handle a request to count the delivery queue */
3984
3985 if (count_queue)
3986   {
3987   set_process_info("counting the queue");
3988   queue_count();
3989   exit(EXIT_SUCCESS);
3990   }
3991
3992 /* Handle actions on specific messages, except for the force delivery and
3993 message load actions, which are done below. Some actions take a whole list of
3994 message ids, which are known to continue up to the end of the arguments. Others
3995 take a single message id and then operate on the recipients list. */
3996
3997 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3998   {
3999   int yield = EXIT_SUCCESS;
4000   set_process_info("acting on specified messages");
4001
4002   if (!one_msg_action)
4003     {
4004     for (i = msg_action_arg; i < argc; i++)
4005       if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4006         yield = EXIT_FAILURE;
4007     }
4008
4009   else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4010     recipients_arg)) yield = EXIT_FAILURE;
4011   exit(yield);
4012   }
4013
4014 /* All the modes below here require the remaining configuration sections
4015 to be read, except that we can skip over the ACL setting when delivering
4016 specific messages, or doing a queue run. (For various testing cases we could
4017 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
4018 for skipping. */
4019
4020 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
4021
4022 /* The configuration data will have been read into POOL_PERM because we won't
4023 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4024 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4025 configuration were read into POOL_MAIN, because we don't do any resets till
4026 later on. However, it seems right, and it does ensure that both pools get used.
4027 */
4028
4029 store_pool = POOL_MAIN;
4030
4031 /* Handle the -brt option. This is for checking out retry configurations.
4032 The next three arguments are a domain name or a complete address, and
4033 optionally two error numbers. All it does is to call the function that
4034 scans the retry configuration data. */
4035
4036 if (test_retry_arg >= 0)
4037   {
4038   retry_config *yield;
4039   int basic_errno = 0;
4040   int more_errno = 0;
4041   uschar *s1, *s2;
4042
4043   if (test_retry_arg >= argc)
4044     {
4045     printf("-brt needs a domain or address argument\n");
4046     exim_exit(EXIT_FAILURE);
4047     }
4048   s1 = argv[test_retry_arg++];
4049   s2 = NULL;
4050
4051   /* If the first argument contains no @ and no . it might be a local user
4052   or it might be a single-component name. Treat as a domain. */
4053
4054   if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4055     {
4056     printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4057       "being \ntreated as a one-component domain, not as a local part.\n\n",
4058       s1);
4059     }
4060
4061   /* There may be an optional second domain arg. */
4062
4063   if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4064     s2 = argv[test_retry_arg++];
4065
4066   /* The final arg is an error name */
4067
4068   if (test_retry_arg < argc)
4069     {
4070     uschar *ss = argv[test_retry_arg];
4071     uschar *error =
4072       readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4073     if (error != NULL)
4074       {
4075       printf("%s\n", CS error);
4076       return EXIT_FAILURE;
4077       }
4078
4079     /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4080     code > 100 as an error is for matching codes to the decade. Turn them into
4081     a real error code, off the decade. */
4082
4083     if (basic_errno == ERRNO_MAIL4XX ||
4084         basic_errno == ERRNO_RCPT4XX ||
4085         basic_errno == ERRNO_DATA4XX)
4086       {
4087       int code = (more_errno >> 8) & 255;
4088       if (code == 255)
4089         more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4090       else if (code > 100)
4091         more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4092       }
4093     }
4094
4095   yield = retry_find_config(s1, s2, basic_errno, more_errno);
4096   if (yield == NULL) printf("No retry information found\n"); else
4097     {
4098     retry_rule *r;
4099     more_errno = yield->more_errno;
4100     printf("Retry rule: %s  ", yield->pattern);
4101
4102     if (yield->basic_errno == ERRNO_EXIMQUOTA)
4103       {
4104       printf("quota%s%s  ",
4105         (more_errno > 0)? "_" : "",
4106         (more_errno > 0)? readconf_printtime(more_errno) : US"");
4107       }
4108     else if (yield->basic_errno == ECONNREFUSED)
4109       {
4110       printf("refused%s%s  ",
4111         (more_errno > 0)? "_" : "",
4112         (more_errno == 'M')? "MX" :
4113         (more_errno == 'A')? "A" : "");
4114       }
4115     else if (yield->basic_errno == ETIMEDOUT)
4116       {
4117       printf("timeout");
4118       if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4119       more_errno &= 255;
4120       if (more_errno != 0) printf("_%s",
4121         (more_errno == 'M')? "MX" : "A");
4122       printf("  ");
4123       }
4124     else if (yield->basic_errno == ERRNO_AUTHFAIL)
4125       printf("auth_failed  ");
4126     else printf("*  ");
4127
4128     for (r = yield->rules; r != NULL; r = r->next)
4129       {
4130       printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4131       printf(",%s", readconf_printtime(r->p1));                 /* amalgamate */
4132       if (r->rule == 'G')
4133         {
4134         int x = r->p2;
4135         int f = x % 1000;
4136         int d = 100;
4137         printf(",%d.", x/1000);
4138         do
4139           {
4140           printf("%d", f/d);
4141           f %= d;
4142           d /= 10;
4143           }
4144         while (f != 0);
4145         }
4146       printf("; ");
4147       }
4148
4149     printf("\n");
4150     }
4151   exim_exit(EXIT_SUCCESS);
4152   }
4153
4154 /* Handle a request to list one or more configuration options */
4155
4156 if (list_options)
4157   {
4158   set_process_info("listing variables");
4159   if (recipients_arg >= argc) readconf_print(US"all", NULL);
4160     else for (i = recipients_arg; i < argc; i++)
4161       {
4162       if (i < argc - 1 &&
4163           (Ustrcmp(argv[i], "router") == 0 ||
4164            Ustrcmp(argv[i], "transport") == 0 ||
4165            Ustrcmp(argv[i], "authenticator") == 0 ||
4166            Ustrcmp(argv[i], "macro") == 0))
4167         {
4168         readconf_print(argv[i+1], argv[i]);
4169         i++;
4170         }
4171       else readconf_print(argv[i], NULL);
4172       }
4173   exim_exit(EXIT_SUCCESS);
4174   }
4175
4176
4177 /* Handle a request to deliver one or more messages that are already on the
4178 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4179 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4180
4181 Delivery of specific messages is typically used for a small number when
4182 prodding by hand (when the option forced_delivery will be set) or when
4183 re-execing to regain root privilege. Each message delivery must happen in a
4184 separate process, so we fork a process for each one, and run them sequentially
4185 so that debugging output doesn't get intertwined, and to avoid spawning too
4186 many processes if a long list is given. However, don't fork for the last one;
4187 this saves a process in the common case when Exim is called to deliver just one
4188 message. */
4189
4190 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4191   {
4192   if (prod_requires_admin && !admin_user)
4193     {
4194     fprintf(stderr, "exim: Permission denied\n");
4195     exim_exit(EXIT_FAILURE);
4196     }
4197   set_process_info("delivering specified messages");
4198   if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
4199   for (i = msg_action_arg; i < argc; i++)
4200     {
4201     int status;
4202     pid_t pid;
4203     if (i == argc - 1)
4204       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4205     else if ((pid = fork()) == 0)
4206       {
4207       (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4208       _exit(EXIT_SUCCESS);
4209       }
4210     else if (pid < 0)
4211       {
4212       fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4213         strerror(errno));
4214       exim_exit(EXIT_FAILURE);
4215       }
4216     else wait(&status);
4217     }
4218   exim_exit(EXIT_SUCCESS);
4219   }
4220
4221
4222 /* If only a single queue run is requested, without SMTP listening, we can just
4223 turn into a queue runner, with an optional starting message id. */
4224
4225 if (queue_interval == 0 && !daemon_listen)
4226   {
4227   DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4228     (start_queue_run_id == NULL)? US"" : US" starting at ",
4229     (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4230     (stop_queue_run_id == NULL)?  US"" : US" stopping at ",
4231     (stop_queue_run_id == NULL)?  US"" : stop_queue_run_id);
4232   set_process_info("running the queue (single queue run)");
4233   queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4234   exim_exit(EXIT_SUCCESS);
4235   }
4236
4237
4238 /* Find the login name of the real user running this process. This is always
4239 needed when receiving a message, because it is written into the spool file. It
4240 may also be used to construct a from: or a sender: header, and in this case we
4241 need the user's full name as well, so save a copy of it, checked for RFC822
4242 syntax and munged if necessary, if it hasn't previously been set by the -F
4243 argument. We may try to get the passwd entry more than once, in case NIS or
4244 other delays are in evidence. Save the home directory for use in filter testing
4245 (only). */
4246
4247 for (i = 0;;)
4248   {
4249   if ((pw = getpwuid(real_uid)) != NULL)
4250     {
4251     originator_login = string_copy(US pw->pw_name);
4252     originator_home = string_copy(US pw->pw_dir);
4253
4254     /* If user name has not been set by -F, set it from the passwd entry
4255     unless -f has been used to set the sender address by a trusted user. */
4256
4257     if (originator_name == NULL)
4258       {
4259       if (sender_address == NULL ||
4260            (!trusted_caller && filter_test == FTEST_NONE))
4261         {
4262         uschar *name = US pw->pw_gecos;
4263         uschar *amp = Ustrchr(name, '&');
4264         uschar buffer[256];
4265
4266         /* Most Unix specify that a '&' character in the gecos field is
4267         replaced by a copy of the login name, and some even specify that
4268         the first character should be upper cased, so that's what we do. */
4269
4270         if (amp != NULL)
4271           {
4272           int loffset;
4273           string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4274             amp - name, name, &loffset, originator_login, amp + 1);
4275           buffer[loffset] = toupper(buffer[loffset]);
4276           name = buffer;
4277           }
4278
4279         /* If a pattern for matching the gecos field was supplied, apply
4280         it and then expand the name string. */
4281
4282         if (gecos_pattern != NULL && gecos_name != NULL)
4283           {
4284           const pcre *re;
4285           re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4286
4287           if (regex_match_and_setup(re, name, 0, -1))
4288             {
4289             uschar *new_name = expand_string(gecos_name);
4290             expand_nmax = -1;
4291             if (new_name != NULL)
4292               {
4293               DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4294                 "gecos field \"%s\"\n", new_name, name);
4295               name = new_name;
4296               }
4297             else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4298               "\"%s\": %s\n", gecos_name, expand_string_message);
4299             }
4300           else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4301             "gecos field \"%s\"\n", gecos_pattern, name);
4302           store_free((void *)re);
4303           }
4304         originator_name = string_copy(name);
4305         }
4306
4307       /* A trusted caller has used -f but not -F */
4308
4309       else originator_name = US"";
4310       }
4311
4312     /* Break the retry loop */
4313
4314     break;
4315     }
4316
4317   if (++i > finduser_retries) break;
4318   sleep(1);
4319   }
4320
4321 /* If we cannot get a user login, log the incident and give up, unless the
4322 configuration specifies something to use. When running in the test harness,
4323 any setting of unknown_login overrides the actual name. */
4324
4325 if (originator_login == NULL || running_in_test_harness)
4326   {
4327   if (unknown_login != NULL)
4328     {
4329     originator_login = expand_string(unknown_login);
4330     if (originator_name == NULL && unknown_username != NULL)
4331       originator_name = expand_string(unknown_username);
4332     if (originator_name == NULL) originator_name = US"";
4333     }
4334   if (originator_login == NULL)
4335     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4336       (int)real_uid);
4337   }
4338
4339 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4340 RFC822 address.*/
4341
4342 originator_name = string_copy(parse_fix_phrase(originator_name,
4343   Ustrlen(originator_name), big_buffer, big_buffer_size));
4344
4345 /* If a message is created by this call of Exim, the uid/gid of its originator
4346 are those of the caller. These values are overridden if an existing message is
4347 read in from the spool. */
4348
4349 originator_uid = real_uid;
4350 originator_gid = real_gid;
4351
4352 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4353   (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4354
4355 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4356 returns. We leave this till here so that the originator_ fields are available
4357 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4358 mode. */
4359
4360 if (daemon_listen || queue_interval > 0)
4361   {
4362   if (mua_wrapper)
4363     {
4364     fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4365     log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4366       "mua_wrapper is set");
4367     }
4368   daemon_go();
4369   }
4370
4371 /* If the sender ident has not been set (by a trusted caller) set it to
4372 the caller. This will get overwritten below for an inetd call. If a trusted
4373 caller has set it empty, unset it. */
4374
4375 if (sender_ident == NULL) sender_ident = originator_login;
4376   else if (sender_ident[0] == 0) sender_ident = NULL;
4377
4378 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4379 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4380 originator_* variables set. */
4381
4382 if (test_rewrite_arg >= 0)
4383   {
4384   really_exim = FALSE;
4385   if (test_rewrite_arg >= argc)
4386     {
4387     printf("-brw needs an address argument\n");
4388     exim_exit(EXIT_FAILURE);
4389     }
4390   rewrite_test(argv[test_rewrite_arg]);
4391   exim_exit(EXIT_SUCCESS);
4392   }
4393
4394 /* A locally-supplied message is considered to be coming from a local user
4395 unless a trusted caller supplies a sender address with -f, or is passing in the
4396 message via SMTP (inetd invocation or otherwise). */
4397
4398 if ((sender_address == NULL && !smtp_input) ||
4399     (!trusted_caller && filter_test == FTEST_NONE))
4400   {
4401   sender_local = TRUE;
4402
4403   /* A trusted caller can supply authenticated_sender and authenticated_id
4404   via -oMas and -oMai and if so, they will already be set. Otherwise, force
4405   defaults except when host checking. */
4406
4407   if (authenticated_sender == NULL && !host_checking)
4408     authenticated_sender = string_sprintf("%s@%s", originator_login,
4409       qualify_domain_sender);
4410   if (authenticated_id == NULL && !host_checking)
4411     authenticated_id = originator_login;
4412   }
4413
4414 /* Trusted callers are always permitted to specify the sender address.
4415 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4416 is specified is the empty address. However, if a trusted caller does not
4417 specify a sender address for SMTP input, we leave sender_address unset. This
4418 causes the MAIL commands to be honoured. */
4419
4420 if ((!smtp_input && sender_address == NULL) ||
4421     !receive_check_set_sender(sender_address))
4422   {
4423   /* Either the caller is not permitted to set a general sender, or this is
4424   non-SMTP input and the trusted caller has not set a sender. If there is no
4425   sender, or if a sender other than <> is set, override with the originator's
4426   login (which will get qualified below), except when checking things. */
4427
4428   if (sender_address == NULL             /* No sender_address set */
4429        ||                                /*         OR            */
4430        (sender_address[0] != 0 &&        /* Non-empty sender address, AND */
4431        !checking &&                      /* Not running tests, AND */
4432        filter_test == FTEST_NONE))       /* Not testing a filter */
4433     {
4434     sender_address = originator_login;
4435     sender_address_forced = FALSE;
4436     sender_address_domain = 0;
4437     }
4438   }
4439
4440 /* Remember whether an untrusted caller set the sender address */
4441
4442 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4443
4444 /* Ensure that the sender address is fully qualified unless it is the empty
4445 address, which indicates an error message, or doesn't exist (root caller, smtp
4446 interface, no -f argument). */
4447
4448 if (sender_address != NULL && sender_address[0] != 0 &&
4449     sender_address_domain == 0)
4450   sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4451     qualify_domain_sender);
4452
4453 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4454
4455 /* Handle a request to verify a list of addresses, or test them for delivery.
4456 This must follow the setting of the sender address, since routers can be
4457 predicated upon the sender. If no arguments are given, read addresses from
4458 stdin. Set debug_level to at least D_v to get full output for address testing.
4459 */
4460
4461 if (verify_address_mode || address_test_mode)
4462   {
4463   int exit_value = 0;
4464   int flags = vopt_qualify;
4465
4466   if (verify_address_mode)
4467     {
4468     if (!verify_as_sender) flags |= vopt_is_recipient;
4469     DEBUG(D_verify) debug_print_ids(US"Verifying:");
4470     }
4471
4472   else
4473     {
4474     flags |= vopt_is_recipient;
4475     debug_selector |= D_v;
4476     debug_file = stderr;
4477     debug_fd = fileno(debug_file);
4478     DEBUG(D_verify) debug_print_ids(US"Address testing:");
4479     }
4480
4481   if (recipients_arg < argc)
4482     {
4483     while (recipients_arg < argc)
4484       {
4485       uschar *s = argv[recipients_arg++];
4486       while (*s != 0)
4487         {
4488         BOOL finished = FALSE;
4489         uschar *ss = parse_find_address_end(s, FALSE);
4490         if (*ss == ',') *ss = 0; else finished = TRUE;
4491         test_address(s, flags, &exit_value);
4492         s = ss;
4493         if (!finished)
4494           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4495         }
4496       }
4497     }
4498
4499   else for (;;)
4500     {
4501     uschar *s = get_stdinput(NULL, NULL);
4502     if (s == NULL) break;
4503     test_address(s, flags, &exit_value);
4504     }
4505
4506   route_tidyup();
4507   exim_exit(exit_value);
4508   }
4509
4510 /* Handle expansion checking. Either expand items on the command line, or read
4511 from stdin if there aren't any. If -Mset was specified, load the message so
4512 that its variables can be used, but restrict this facility to admin users.
4513 Otherwise, if -bem was used, read a message from stdin. */
4514
4515 if (expansion_test)
4516   {
4517   if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4518     {
4519     uschar spoolname[256];  /* Not big_buffer; used in spool_read_header() */
4520     if (!admin_user)
4521       {
4522       fprintf(stderr, "exim: permission denied\n");
4523       exit(EXIT_FAILURE);
4524       }
4525     message_id = argv[msg_action_arg];
4526     (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4527     if (!spool_open_datafile(message_id))
4528       printf ("Failed to load message datafile %s\n", message_id);
4529     if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4530       printf ("Failed to load message %s\n", message_id);
4531     }
4532
4533   /* Read a test message from a file. We fudge it up to be on stdin, saving
4534   stdin itself for later reading of expansion strings. */
4535
4536   else if (expansion_test_message != NULL)
4537     {
4538     int save_stdin = dup(0);
4539     int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4540     if (fd < 0)
4541       {
4542       fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4543         strerror(errno));
4544       return EXIT_FAILURE;
4545       }
4546     (void) dup2(fd, 0);
4547     filter_test = FTEST_USER;      /* Fudge to make it look like filter test */
4548     message_ended = END_NOTENDED;
4549     read_message_body(receive_msg(extract_recipients));
4550     message_linecount += body_linecount;
4551     (void)dup2(save_stdin, 0);
4552     (void)close(save_stdin);
4553     clearerr(stdin);               /* Required by Darwin */
4554     }
4555
4556   /* Allow $recipients for this testing */
4557
4558   enable_dollar_recipients = TRUE;
4559
4560   /* Expand command line items */
4561
4562   if (recipients_arg < argc)
4563     {
4564     while (recipients_arg < argc)
4565       {
4566       uschar *s = argv[recipients_arg++];
4567       uschar *ss = expand_string(s);
4568       if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4569       else printf("%s\n", CS ss);
4570       }
4571     }
4572
4573   /* Read stdin */
4574
4575   else
4576     {
4577     char *(*fn_readline)(const char *) = NULL;
4578     void (*fn_addhist)(const char *) = NULL;
4579
4580     #ifdef USE_READLINE
4581     void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4582     #endif
4583
4584     for (;;)
4585       {
4586       uschar *ss;
4587       uschar *source = get_stdinput(fn_readline, fn_addhist);
4588       if (source == NULL) break;
4589       ss = expand_string(source);
4590       if (ss == NULL)
4591         printf ("Failed: %s\n", expand_string_message);
4592       else printf("%s\n", CS ss);
4593       }
4594
4595     #ifdef USE_READLINE
4596     if (dlhandle != NULL) dlclose(dlhandle);
4597     #endif
4598     }
4599
4600   /* The data file will be open after -Mset */
4601
4602   if (deliver_datafile >= 0)
4603     {
4604     (void)close(deliver_datafile);
4605     deliver_datafile = -1;
4606     }
4607
4608   exim_exit(EXIT_SUCCESS);
4609   }
4610
4611
4612 /* The active host name is normally the primary host name, but it can be varied
4613 for hosts that want to play several parts at once. We need to ensure that it is
4614 set for host checking, and for receiving messages. */
4615
4616 smtp_active_hostname = primary_hostname;
4617 if (raw_active_hostname != NULL)
4618   {
4619   uschar *nah = expand_string(raw_active_hostname);
4620   if (nah == NULL)
4621     {
4622     if (!expand_string_forcedfail)
4623       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4624         "(smtp_active_hostname): %s", raw_active_hostname,
4625         expand_string_message);
4626     }
4627   else if (nah[0] != 0) smtp_active_hostname = nah;
4628   }
4629
4630 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4631 given IP address so that the blocking and relay configuration can be tested.
4632 Unless a sender_ident was set by -oMt, we discard it (the default is the
4633 caller's login name). An RFC 1413 call is made only if we are running in the
4634 test harness and an incoming interface and both ports are specified, because
4635 there is no TCP/IP call to find the ident for. */
4636
4637 if (host_checking)
4638   {
4639   int x[4];
4640   int size;
4641
4642   if (!sender_ident_set)
4643     {
4644     sender_ident = NULL;
4645     if (running_in_test_harness && sender_host_port != 0 &&
4646         interface_address != NULL && interface_port != 0)
4647       verify_get_ident(1413);
4648     }
4649
4650   /* In case the given address is a non-canonical IPv6 address, canonicize
4651   it. The code works for both IPv4 and IPv6, as it happens. */
4652
4653   size = host_aton(sender_host_address, x);
4654   sender_host_address = store_get(48);  /* large enough for full IPv6 */
4655   (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4656
4657   /* Now set up for testing */
4658
4659   host_build_sender_fullhost();
4660   smtp_input = TRUE;
4661   smtp_in = stdin;
4662   smtp_out = stdout;
4663   sender_local = FALSE;
4664   sender_host_notsocket = TRUE;
4665   debug_file = stderr;
4666   debug_fd = fileno(debug_file);
4667   fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4668     "**** but without any ident (RFC 1413) callback.\n"
4669     "**** This is not for real!\n\n",
4670       sender_host_address);
4671
4672   if (verify_check_host(&hosts_connection_nolog) == OK)
4673     log_write_selector &= ~L_smtp_connection;
4674   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4675
4676   /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4677   because a log line has already been written for all its failure exists
4678   (usually "connection refused: <reason>") and writing another one is
4679   unnecessary clutter. */
4680
4681   if (smtp_start_session())
4682     {
4683     reset_point = store_get(0);
4684     for (;;)
4685       {
4686       store_reset(reset_point);
4687       if (smtp_setup_msg() <= 0) break;
4688       if (!receive_msg(FALSE)) break;
4689       }
4690     smtp_log_no_mail();
4691     }
4692   exim_exit(EXIT_SUCCESS);
4693   }
4694
4695
4696 /* Arrange for message reception if recipients or SMTP were specified;
4697 otherwise complain unless a version print (-bV) happened or this is a filter
4698 verification test. In the former case, show the configuration file name. */
4699
4700 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4701   {
4702   if (version_printed)
4703     {
4704     printf("Configuration file is %s\n", config_main_filename);
4705     return EXIT_SUCCESS;
4706     }
4707
4708   if (filter_test == FTEST_NONE)
4709     exim_usage(called_as);
4710   }
4711
4712
4713 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4714 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4715 that we are not called from inetd, because that is rejected above. The
4716 following configuration settings are forced here:
4717
4718   (1) Synchronous delivery (-odi)
4719   (2) Errors to stderr (-oep == -oeq)
4720   (3) No parallel remote delivery
4721   (4) Unprivileged delivery
4722
4723 We don't force overall queueing options because there are several of them;
4724 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4725 to override any SMTP queueing. */
4726
4727 if (mua_wrapper)
4728   {
4729   synchronous_delivery = TRUE;
4730   arg_error_handling = ERRORS_STDERR;
4731   remote_max_parallel = 1;
4732   deliver_drop_privilege = TRUE;
4733   queue_smtp = FALSE;
4734   queue_smtp_domains = NULL;
4735   }
4736
4737
4738 /* Prepare to accept one or more new messages on the standard input. When a
4739 message has been read, its id is returned in message_id[]. If doing immediate
4740 delivery, we fork a delivery process for each received message, except for the
4741 last one, where we can save a process switch.
4742
4743 It is only in non-smtp mode that error_handling is allowed to be changed from
4744 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4745 sendmail error modes other than -oem ever actually used? Later: yes.) */
4746
4747 if (!smtp_input) error_handling = arg_error_handling;
4748
4749 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4750 logging being sent down the socket and make an identd call to get the
4751 sender_ident. */
4752
4753 else if (is_inetd)
4754   {
4755   (void)fclose(stderr);
4756   exim_nullstd();                       /* Re-open to /dev/null */
4757   verify_get_ident(IDENT_PORT);
4758   host_build_sender_fullhost();
4759   set_process_info("handling incoming connection from %s via inetd",
4760     sender_fullhost);
4761   }
4762
4763 /* If the sender host address has been set, build sender_fullhost if it hasn't
4764 already been done (which it will have been for inetd). This caters for the
4765 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4766 so that the test for IP options is skipped for -bs input. */
4767
4768 if (sender_host_address != NULL && sender_fullhost == NULL)
4769   {
4770   host_build_sender_fullhost();
4771   set_process_info("handling incoming connection from %s via -oMa",
4772     sender_fullhost);
4773   sender_host_notsocket = TRUE;
4774   }
4775
4776 /* Otherwise, set the sender host as unknown except for inetd calls. This
4777 prevents host checking in the case of -bs not from inetd and also for -bS. */
4778
4779 else if (!is_inetd) sender_host_unknown = TRUE;
4780
4781 /* If stdout does not exist, then dup stdin to stdout. This can happen
4782 if exim is started from inetd. In this case fd 0 will be set to the socket,
4783 but fd 1 will not be set. This also happens for passed SMTP channels. */
4784
4785 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4786
4787 /* Set up the incoming protocol name and the state of the program. Root is
4788 allowed to force received protocol via the -oMr option above. If we have come
4789 via inetd, the process info has already been set up. We don't set
4790 received_protocol here for smtp input, as it varies according to
4791 batch/HELO/EHLO/AUTH/TLS. */
4792
4793 if (smtp_input)
4794   {
4795   if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4796     smtp_batched_input? "batched " : "",
4797     (sender_address!= NULL)? sender_address : originator_login);
4798   }
4799 else
4800   {
4801   if (received_protocol == NULL)
4802     received_protocol = string_sprintf("local%s", called_as);
4803   set_process_info("accepting a local non-SMTP message from <%s>",
4804     sender_address);
4805   }
4806
4807 /* Initialize the session_local_queue-only flag (this will be ignored if
4808 mua_wrapper is set) */
4809
4810 queue_check_only();
4811 session_local_queue_only = queue_only;
4812
4813 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4814 the spool if so configured. On failure, we must not attempt to send an error
4815 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4816 error code is given.) */
4817
4818 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4819   {
4820   fprintf(stderr, "exim: insufficient disk space\n");
4821   return EXIT_FAILURE;
4822   }
4823
4824 /* If this is smtp input of any kind, real or batched, handle the start of the
4825 SMTP session.
4826
4827 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4828 because a log line has already been written for all its failure exists
4829 (usually "connection refused: <reason>") and writing another one is
4830 unnecessary clutter. */
4831
4832 if (smtp_input)
4833   {
4834   smtp_in = stdin;
4835   smtp_out = stdout;
4836   if (verify_check_host(&hosts_connection_nolog) == OK)
4837     log_write_selector &= ~L_smtp_connection;
4838   log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4839   if (!smtp_start_session())
4840     {
4841     mac_smtp_fflush();
4842     exim_exit(EXIT_SUCCESS);
4843     }
4844   }
4845
4846 /* Otherwise, set up the input size limit here. */
4847
4848 else
4849   {
4850   thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4851   if (expand_string_message != NULL)
4852     {
4853     if (thismessage_size_limit == -1)
4854       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4855         "message_size_limit: %s", expand_string_message);
4856     else
4857       log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4858         "message_size_limit: %s", expand_string_message);
4859     }
4860   }
4861
4862 /* Loop for several messages when reading SMTP input. If we fork any child
4863 processes, we don't want to wait for them unless synchronous delivery is
4864 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4865 same as SIG_DFL, despite the fact that documentation often lists the default as
4866 "ignore". This is a confusing area. This is what I know:
4867
4868 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4869 processes that complete simply to go away without ever becoming defunct. You
4870 can't then wait for them - but we don't want to wait for them in the
4871 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4872 happen for all OS (e.g. *BSD is different).
4873
4874 But that's not the end of the story. Some (many? all?) systems have the
4875 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4876 has by default, so it seems that the difference is merely one of default
4877 (compare restarting vs non-restarting signals).
4878
4879 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4880 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4881 of the loop below. Paranoia rules.
4882
4883 February 2003: That's *still* not the end of the story. There are now versions
4884 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4885 process then calls waitpid(), a grumble is written to the system log, because
4886 this is logically inconsistent. In other words, it doesn't like the paranoia.
4887 As a consequenc of this, the waitpid() below is now excluded if we are sure
4888 that SIG_IGN works. */
4889
4890 if (!synchronous_delivery)
4891   {
4892   #ifdef SA_NOCLDWAIT
4893   struct sigaction act;
4894   act.sa_handler = SIG_IGN;
4895   sigemptyset(&(act.sa_mask));
4896   act.sa_flags = SA_NOCLDWAIT;
4897   sigaction(SIGCHLD, &act, NULL);
4898   #else
4899   signal(SIGCHLD, SIG_IGN);
4900   #endif
4901   }
4902
4903 /* Save the current store pool point, for resetting at the start of
4904 each message, and save the real sender address, if any. */
4905
4906 reset_point = store_get(0);
4907 real_sender_address = sender_address;
4908
4909 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4910 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4911 collapsed). */
4912
4913 while (more)
4914   {
4915   store_reset(reset_point);
4916   message_id[0] = 0;
4917
4918   /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4919   input and build the recipients list, before calling receive_msg() to read the
4920   message proper. Whatever sender address is given in the SMTP transaction is
4921   often ignored for local senders - we use the actual sender, which is normally
4922   either the underlying user running this process or a -f argument provided by
4923   a trusted caller. It is saved in real_sender_address. The test for whether to
4924   accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4925
4926   if (smtp_input)
4927     {
4928     int rc;
4929     if ((rc = smtp_setup_msg()) > 0)
4930       {
4931       if (real_sender_address != NULL &&
4932           !receive_check_set_sender(sender_address))
4933         {
4934         sender_address = raw_sender = real_sender_address;
4935         sender_address_unrewritten = NULL;
4936         }
4937
4938       /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4939       isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4940       the very end. The result of the ACL is ignored (as for other non-SMTP
4941       messages). It is run for its potential side effects. */
4942
4943       if (smtp_batched_input && acl_not_smtp_start != NULL)
4944         {
4945         uschar *user_msg, *log_msg;
4946         enable_dollar_recipients = TRUE;
4947         (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4948           &user_msg, &log_msg);
4949         enable_dollar_recipients = FALSE;
4950         }
4951
4952       /* Now get the data for the message */
4953
4954       more = receive_msg(extract_recipients);
4955       if (message_id[0] == 0)
4956         {
4957         if (more) continue;
4958         smtp_log_no_mail();               /* Log no mail if configured */
4959         exim_exit(EXIT_FAILURE);
4960         }
4961       }
4962     else
4963       {
4964       smtp_log_no_mail();               /* Log no mail if configured */
4965       exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4966       }
4967     }
4968
4969   /* In the non-SMTP case, we have all the information from the command
4970   line, but must process it in case it is in the more general RFC822
4971   format, and in any case, to detect syntax errors. Also, it appears that
4972   the use of comma-separated lists as single arguments is common, so we
4973   had better support them. */
4974
4975   else
4976     {
4977     int i;
4978     int rcount = 0;
4979     int count = argc - recipients_arg;
4980     uschar **list = argv + recipients_arg;
4981
4982     /* These options cannot be changed dynamically for non-SMTP messages */
4983
4984     active_local_sender_retain = local_sender_retain;
4985     active_local_from_check = local_from_check;
4986
4987     /* Save before any rewriting */
4988
4989     raw_sender = string_copy(sender_address);
4990
4991     /* Loop for each argument */
4992
4993     for (i = 0; i < count; i++)
4994       {
4995       int start, end, domain;
4996       uschar *errmess;
4997       uschar *s = list[i];
4998
4999       /* Loop for each comma-separated address */
5000
5001       while (*s != 0)
5002         {
5003         BOOL finished = FALSE;
5004         uschar *recipient;
5005         uschar *ss = parse_find_address_end(s, FALSE);
5006
5007         if (*ss == ',') *ss = 0; else finished = TRUE;
5008
5009         /* Check max recipients - if -t was used, these aren't recipients */
5010
5011         if (recipients_max > 0 && ++rcount > recipients_max &&
5012             !extract_recipients)
5013           {
5014           if (error_handling == ERRORS_STDERR)
5015             {
5016             fprintf(stderr, "exim: too many recipients\n");
5017             exim_exit(EXIT_FAILURE);
5018             }
5019           else
5020             {
5021             return
5022               moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5023                 errors_sender_rc : EXIT_FAILURE;
5024             }
5025           }
5026
5027         recipient =
5028           parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5029
5030         if (domain == 0 && !allow_unqualified_recipient)
5031           {
5032           recipient = NULL;
5033           errmess = US"unqualified recipient address not allowed";
5034           }
5035
5036         if (recipient == NULL)
5037           {
5038           if (error_handling == ERRORS_STDERR)
5039             {
5040             fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5041               string_printing(list[i]), errmess);
5042             exim_exit(EXIT_FAILURE);
5043             }
5044           else
5045             {
5046             error_block eblock;
5047             eblock.next = NULL;
5048             eblock.text1 = string_printing(list[i]);
5049             eblock.text2 = errmess;
5050             return
5051               moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5052                 errors_sender_rc : EXIT_FAILURE;
5053             }
5054           }
5055
5056         receive_add_recipient(recipient, -1);
5057         s = ss;
5058         if (!finished)
5059           while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5060         }
5061       }
5062
5063     /* Show the recipients when debugging */
5064
5065     DEBUG(D_receive)
5066       {
5067       int i;
5068       if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
5069       if (recipients_list != NULL)
5070         {
5071         debug_printf("Recipients:\n");
5072         for (i = 0; i < recipients_count; i++)
5073           debug_printf("  %s\n", recipients_list[i].address);
5074         }
5075       }
5076
5077     /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5078     ignored; rejecting here would just add complication, and it can just as
5079     well be done later. Allow $recipients to be visible in the ACL. */
5080
5081     if (acl_not_smtp_start != NULL)
5082       {
5083       uschar *user_msg, *log_msg;
5084       enable_dollar_recipients = TRUE;
5085       (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5086         &user_msg, &log_msg);
5087       enable_dollar_recipients = FALSE;
5088       }
5089
5090     /* Read the data for the message. If filter_test is not FTEST_NONE, this
5091     will just read the headers for the message, and not write anything onto the
5092     spool. */
5093
5094     message_ended = END_NOTENDED;
5095     more = receive_msg(extract_recipients);
5096
5097     /* more is always FALSE here (not SMTP message) when reading a message
5098     for real; when reading the headers of a message for filter testing,
5099     it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5100
5101     if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
5102     }  /* Non-SMTP message reception */
5103
5104   /* If this is a filter testing run, there are headers in store, but
5105   no message on the spool. Run the filtering code in testing mode, setting
5106   the domain to the qualify domain and the local part to the current user,
5107   unless they have been set by options. The prefix and suffix are left unset
5108   unless specified. The the return path is set to to the sender unless it has
5109   already been set from a return-path header in the message. */
5110
5111   if (filter_test != FTEST_NONE)
5112     {
5113     deliver_domain = (ftest_domain != NULL)?
5114       ftest_domain : qualify_domain_recipient;
5115     deliver_domain_orig = deliver_domain;
5116     deliver_localpart = (ftest_localpart != NULL)?
5117       ftest_localpart : originator_login;
5118     deliver_localpart_orig = deliver_localpart;
5119     deliver_localpart_prefix = ftest_prefix;
5120     deliver_localpart_suffix = ftest_suffix;
5121     deliver_home = originator_home;
5122
5123     if (return_path == NULL)
5124       {
5125       printf("Return-path copied from sender\n");
5126       return_path = string_copy(sender_address);
5127       }
5128     else
5129       {
5130       printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5131       }
5132     printf("Sender      = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5133
5134     receive_add_recipient(
5135       string_sprintf("%s%s%s@%s",
5136         (ftest_prefix == NULL)? US"" : ftest_prefix,
5137         deliver_localpart,
5138         (ftest_suffix == NULL)? US"" : ftest_suffix,
5139         deliver_domain), -1);
5140
5141     printf("Recipient   = %s\n", recipients_list[0].address);
5142     if (ftest_prefix != NULL) printf("Prefix    = %s\n", ftest_prefix);
5143     if (ftest_suffix != NULL) printf("Suffix    = %s\n", ftest_suffix);
5144
5145     (void)chdir("/");   /* Get away from wherever the user is running this from */
5146
5147     /* Now we run either a system filter test, or a user filter test, or both.
5148     In the latter case, headers added by the system filter will persist and be
5149     available to the user filter. We need to copy the filter variables
5150     explicitly. */
5151
5152     if ((filter_test & FTEST_SYSTEM) != 0)
5153       {
5154       if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5155         exim_exit(EXIT_FAILURE);
5156       }
5157
5158     memcpy(filter_sn, filter_n, sizeof(filter_sn));
5159
5160     if ((filter_test & FTEST_USER) != 0)
5161       {
5162       if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5163         exim_exit(EXIT_FAILURE);
5164       }
5165
5166     exim_exit(EXIT_SUCCESS);
5167     }
5168
5169   /* Else act on the result of message reception. We should not get here unless
5170   message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5171   will be TRUE. If it is not, check on the number of messages received in this
5172   connection. */
5173
5174   if (!session_local_queue_only &&
5175       smtp_accept_queue_per_connection > 0 &&
5176       receive_messagecount > smtp_accept_queue_per_connection)
5177     {
5178     session_local_queue_only = TRUE;
5179     queue_only_reason = 2;
5180     }
5181
5182   /* Initialize local_queue_only from session_local_queue_only. If it is false,
5183   and queue_only_load is set, check that the load average is below it. If it is
5184   not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5185   default), we put the whole session into queue_only mode. It then remains this
5186   way for any subsequent messages on the same SMTP connection. This is a
5187   deliberate choice; even though the load average may fall, it doesn't seem
5188   right to deliver later messages on the same call when not delivering earlier
5189   ones. However, there are odd cases where this is not wanted, so this can be
5190   changed by setting queue_only_load_latch false. */
5191
5192   local_queue_only = session_local_queue_only;
5193   if (!local_queue_only && queue_only_load >= 0)
5194     {
5195     local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
5196     if (local_queue_only)
5197       {
5198       queue_only_reason = 3;
5199       if (queue_only_load_latch) session_local_queue_only = TRUE;
5200       }
5201     }
5202
5203   /* If running as an MUA wrapper, all queueing options and freezing options
5204   are ignored. */
5205
5206   if (mua_wrapper)
5207     local_queue_only = queue_only_policy = deliver_freeze = FALSE;
5208
5209   /* Log the queueing here, when it will get a message id attached, but
5210   not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5211   connections). */
5212
5213   if (local_queue_only) switch(queue_only_reason)
5214     {
5215     case 2:
5216     log_write(L_delay_delivery,
5217               LOG_MAIN, "no immediate delivery: more than %d messages "
5218       "received in one connection", smtp_accept_queue_per_connection);
5219     break;
5220
5221     case 3:
5222     log_write(L_delay_delivery,
5223               LOG_MAIN, "no immediate delivery: load average %.2f",
5224               (double)load_average/1000.0);
5225     break;
5226     }
5227
5228   /* Else do the delivery unless the ACL or local_scan() called for queue only
5229   or froze the message. Always deliver in a separate process. A fork failure is
5230   not a disaster, as the delivery will eventually happen on a subsequent queue
5231   run. The search cache must be tidied before the fork, as the parent will
5232   do it before exiting. The child will trigger a lookup failure and
5233   thereby defer the delivery if it tries to use (for example) a cached ldap
5234   connection that the parent has called unbind on. */
5235
5236   else if (!queue_only_policy && !deliver_freeze)
5237     {
5238     pid_t pid;
5239     search_tidyup();
5240
5241     if ((pid = fork()) == 0)
5242       {
5243       int rc;
5244       close_unwanted();      /* Close unwanted file descriptors and TLS */
5245       exim_nullstd();        /* Ensure std{in,out,err} exist */
5246
5247       /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5248       mode, deliver_drop_privilege is forced TRUE). */
5249
5250       if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5251         {
5252         (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5253           message_id);
5254         /* Control does not return here. */
5255         }
5256
5257       /* No need to re-exec */
5258
5259       rc = deliver_message(message_id, FALSE, FALSE);
5260       search_tidyup();
5261       _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5262         EXIT_SUCCESS : EXIT_FAILURE);
5263       }
5264
5265     if (pid < 0)
5266       {
5267       log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5268         "process: %s", strerror(errno));
5269       }
5270
5271     /* In the parent, wait if synchronous delivery is required. This will
5272     always be the case in MUA wrapper mode. */
5273
5274     else if (synchronous_delivery)
5275       {
5276       int status;
5277       while (wait(&status) != pid);
5278       if ((status & 0x00ff) != 0)
5279         log_write(0, LOG_MAIN|LOG_PANIC,
5280           "process %d crashed with signal %d while delivering %s",
5281           (int)pid, status & 0x00ff, message_id);
5282       if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5283       }
5284     }
5285
5286   /* The loop will repeat if more is TRUE. If we do not know know that the OS
5287   automatically reaps children (see comments above the loop), clear away any
5288   finished subprocesses here, in case there are lots of messages coming in
5289   from the same source. */
5290
5291   #ifndef SIG_IGN_WORKS
5292   while (waitpid(-1, NULL, WNOHANG) > 0);
5293   #endif
5294   }
5295
5296 exim_exit(EXIT_SUCCESS);   /* Never returns */
5297 return 0;                  /* To stop compiler warning */
5298 }
5299
5300 /* End of exim.c */