1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)deliver.c 8.63 (Berkeley) 01/15/94"; 11 #endif /* not lint */ 12 13 #include "sendmail.h" 14 #include <netdb.h> 15 #include <errno.h> 16 #ifdef NAMED_BIND 17 #include <arpa/nameser.h> 18 #include <resolv.h> 19 20 extern int h_errno; 21 #endif 22 23 extern char SmtpError[]; 24 25 /* 26 ** SENDALL -- actually send all the messages. 27 ** 28 ** Parameters: 29 ** e -- the envelope to send. 30 ** mode -- the delivery mode to use. If SM_DEFAULT, use 31 ** the current e->e_sendmode. 32 ** 33 ** Returns: 34 ** none. 35 ** 36 ** Side Effects: 37 ** Scans the send lists and sends everything it finds. 38 ** Delivers any appropriate error messages. 39 ** If we are running in a non-interactive mode, takes the 40 ** appropriate action. 41 */ 42 43 sendall(e, mode) 44 ENVELOPE *e; 45 char mode; 46 { 47 register ADDRESS *q; 48 char *owner; 49 int otherowners; 50 register ENVELOPE *ee; 51 ENVELOPE *splitenv = NULL; 52 bool announcequeueup; 53 54 /* 55 ** If we have had global, fatal errors, don't bother sending 56 ** the message at all if we are in SMTP mode. Local errors 57 ** (e.g., a single address failing) will still cause the other 58 ** addresses to be sent. 59 */ 60 61 if (bitset(EF_FATALERRS, e->e_flags) && 62 (OpMode == MD_SMTP || OpMode == MD_DAEMON)) 63 { 64 e->e_flags |= EF_CLRQUEUE; 65 return; 66 } 67 68 /* determine actual delivery mode */ 69 CurrentLA = getla(); 70 if (mode == SM_DEFAULT) 71 { 72 mode = e->e_sendmode; 73 if (mode != SM_VERIFY && 74 shouldqueue(e->e_msgpriority, e->e_ctime)) 75 mode = SM_QUEUE; 76 announcequeueup = mode == SM_QUEUE; 77 } 78 else 79 announcequeueup = FALSE; 80 81 if (tTd(13, 1)) 82 { 83 printf("\n===== SENDALL: mode %c, id %s, e_from ", 84 mode, e->e_id); 85 printaddr(&e->e_from, FALSE); 86 printf("sendqueue:\n"); 87 printaddr(e->e_sendqueue, TRUE); 88 } 89 90 /* 91 ** Do any preprocessing necessary for the mode we are running. 92 ** Check to make sure the hop count is reasonable. 93 ** Delete sends to the sender in mailing lists. 94 */ 95 96 CurEnv = e; 97 98 if (e->e_hopcount > MaxHopCount) 99 { 100 errno = 0; 101 syserr("554 too many hops %d (%d max): from %s via %s, to %s", 102 e->e_hopcount, MaxHopCount, e->e_from.q_paddr, 103 RealHostName, e->e_sendqueue->q_paddr); 104 return; 105 } 106 107 /* 108 ** Do sender deletion. 109 ** 110 ** If the sender has the QQUEUEUP flag set, skip this. 111 ** This can happen if the name server is hosed when you 112 ** are trying to send mail. The result is that the sender 113 ** is instantiated in the queue as a recipient. 114 */ 115 116 if (!bitset(EF_METOO, e->e_flags) && 117 !bitset(QQUEUEUP, e->e_from.q_flags)) 118 { 119 if (tTd(13, 5)) 120 { 121 printf("sendall: QDONTSEND "); 122 printaddr(&e->e_from, FALSE); 123 } 124 e->e_from.q_flags |= QDONTSEND; 125 (void) recipient(&e->e_from, &e->e_sendqueue, e); 126 } 127 128 /* 129 ** Handle alias owners. 130 ** 131 ** We scan up the q_alias chain looking for owners. 132 ** We discard owners that are the same as the return path. 133 */ 134 135 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 136 { 137 register struct address *a; 138 139 for (a = q; a != NULL && a->q_owner == NULL; a = a->q_alias) 140 continue; 141 if (a != NULL) 142 q->q_owner = a->q_owner; 143 144 if (q->q_owner != NULL && 145 !bitset(QDONTSEND, q->q_flags) && 146 strcmp(q->q_owner, e->e_from.q_paddr) == 0) 147 q->q_owner = NULL; 148 } 149 150 owner = ""; 151 otherowners = 1; 152 while (owner != NULL && otherowners > 0) 153 { 154 owner = NULL; 155 otherowners = 0; 156 157 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 158 { 159 if (bitset(QDONTSEND, q->q_flags)) 160 continue; 161 162 if (q->q_owner != NULL) 163 { 164 if (owner == NULL) 165 owner = q->q_owner; 166 else if (owner != q->q_owner) 167 { 168 if (strcmp(owner, q->q_owner) == 0) 169 { 170 /* make future comparisons cheap */ 171 q->q_owner = owner; 172 } 173 else 174 { 175 otherowners++; 176 } 177 owner = q->q_owner; 178 } 179 } 180 else 181 { 182 otherowners++; 183 } 184 } 185 186 if (owner != NULL && otherowners > 0) 187 { 188 extern HDR *copyheader(); 189 extern ADDRESS *copyqueue(); 190 191 /* 192 ** Split this envelope into two. 193 */ 194 195 ee = (ENVELOPE *) xalloc(sizeof(ENVELOPE)); 196 *ee = *e; 197 ee->e_id = NULL; 198 (void) queuename(ee, '\0'); 199 200 if (tTd(13, 1)) 201 printf("sendall: split %s into %s\n", 202 e->e_id, ee->e_id); 203 204 ee->e_header = copyheader(e->e_header); 205 ee->e_sendqueue = copyqueue(e->e_sendqueue); 206 ee->e_errorqueue = copyqueue(e->e_errorqueue); 207 ee->e_flags = e->e_flags & ~(EF_INQUEUE|EF_CLRQUEUE|EF_FATALERRS); 208 setsender(owner, ee, NULL, TRUE); 209 if (tTd(13, 5)) 210 { 211 printf("sendall(split): QDONTSEND "); 212 printaddr(&ee->e_from, FALSE); 213 } 214 ee->e_from.q_flags |= QDONTSEND; 215 ee->e_dfp = NULL; 216 ee->e_xfp = NULL; 217 ee->e_df = NULL; 218 ee->e_errormode = EM_MAIL; 219 ee->e_sibling = splitenv; 220 splitenv = ee; 221 222 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 223 if (q->q_owner == owner) 224 q->q_flags |= QDONTSEND; 225 for (q = ee->e_sendqueue; q != NULL; q = q->q_next) 226 if (q->q_owner != owner) 227 q->q_flags |= QDONTSEND; 228 229 if (e->e_df != NULL && mode != SM_VERIFY) 230 { 231 ee->e_dfp = NULL; 232 ee->e_df = queuename(ee, 'd'); 233 ee->e_df = newstr(ee->e_df); 234 if (link(e->e_df, ee->e_df) < 0) 235 { 236 syserr("sendall: link(%s, %s)", 237 e->e_df, ee->e_df); 238 } 239 } 240 241 if (mode != SM_VERIFY) 242 openxscript(ee); 243 #ifdef LOG 244 if (LogLevel > 4) 245 syslog(LOG_INFO, "%s: clone %s", 246 ee->e_id, e->e_id); 247 #endif 248 } 249 } 250 251 if (owner != NULL) 252 { 253 setsender(owner, e, NULL, TRUE); 254 if (tTd(13, 5)) 255 { 256 printf("sendall(owner): QDONTSEND "); 257 printaddr(&e->e_from, FALSE); 258 } 259 e->e_from.q_flags |= QDONTSEND; 260 e->e_errormode = EM_MAIL; 261 } 262 263 # ifdef QUEUE 264 if ((mode == SM_QUEUE || mode == SM_FORK || 265 (mode != SM_VERIFY && SuperSafe)) && 266 !bitset(EF_INQUEUE, e->e_flags)) 267 { 268 /* be sure everything is instantiated in the queue */ 269 queueup(e, TRUE, announcequeueup); 270 for (ee = splitenv; ee != NULL; ee = ee->e_sibling) 271 queueup(ee, TRUE, announcequeueup); 272 } 273 #endif /* QUEUE */ 274 275 if (splitenv != NULL) 276 { 277 if (tTd(13, 1)) 278 { 279 printf("\nsendall: Split queue; remaining queue:\n"); 280 printaddr(e->e_sendqueue, TRUE); 281 } 282 283 for (ee = splitenv; ee != NULL; ee = ee->e_sibling) 284 { 285 CurEnv = ee; 286 sendenvelope(ee, mode); 287 } 288 289 CurEnv = e; 290 } 291 sendenvelope(e, mode); 292 293 for (; splitenv != NULL; splitenv = splitenv->e_sibling) 294 dropenvelope(splitenv); 295 } 296 297 sendenvelope(e, mode) 298 register ENVELOPE *e; 299 char mode; 300 { 301 bool oldverbose; 302 int pid; 303 register ADDRESS *q; 304 char *qf; 305 char *id; 306 307 /* 308 ** If we have had global, fatal errors, don't bother sending 309 ** the message at all if we are in SMTP mode. Local errors 310 ** (e.g., a single address failing) will still cause the other 311 ** addresses to be sent. 312 */ 313 314 if (bitset(EF_FATALERRS, e->e_flags) && 315 (OpMode == MD_SMTP || OpMode == MD_DAEMON)) 316 { 317 e->e_flags |= EF_CLRQUEUE; 318 return; 319 } 320 321 oldverbose = Verbose; 322 switch (mode) 323 { 324 case SM_VERIFY: 325 Verbose = TRUE; 326 break; 327 328 case SM_QUEUE: 329 queueonly: 330 e->e_flags |= EF_INQUEUE|EF_KEEPQUEUE; 331 return; 332 333 case SM_FORK: 334 if (e->e_xfp != NULL) 335 (void) fflush(e->e_xfp); 336 337 # ifndef HASFLOCK 338 /* 339 ** Since fcntl locking has the interesting semantic that 340 ** the lock is owned by a process, not by an open file 341 ** descriptor, we have to flush this to the queue, and 342 ** then restart from scratch in the child. 343 */ 344 345 /* save id for future use */ 346 id = e->e_id; 347 348 /* now drop the envelope in the parent */ 349 e->e_flags |= EF_INQUEUE|EF_KEEPQUEUE; 350 dropenvelope(e); 351 352 /* and reacquire in the child */ 353 (void) dowork(id, TRUE, FALSE, e); 354 355 return; 356 357 # else /* HASFLOCK */ 358 359 pid = fork(); 360 if (pid < 0) 361 { 362 goto queueonly; 363 } 364 else if (pid > 0) 365 { 366 /* be sure we leave the temp files to our child */ 367 /* can't call unlockqueue to avoid unlink of xfp */ 368 if (e->e_lockfp != NULL) 369 (void) xfclose(e->e_lockfp, "sendenvelope", "lockfp"); 370 e->e_lockfp = NULL; 371 372 /* close any random open files in the envelope */ 373 closexscript(e); 374 if (e->e_dfp != NULL) 375 (void) xfclose(e->e_dfp, "sendenvelope", e->e_df); 376 e->e_dfp = NULL; 377 e->e_id = e->e_df = NULL; 378 return; 379 } 380 381 /* double fork to avoid zombies */ 382 if (fork() > 0) 383 exit(EX_OK); 384 385 /* be sure we are immune from the terminal */ 386 disconnect(1, e); 387 388 /* 389 ** Close any cached connections. 390 ** 391 ** We don't send the QUIT protocol because the parent 392 ** still knows about the connection. 393 ** 394 ** This should only happen when delivering an error 395 ** message. 396 */ 397 398 mci_flush(FALSE, NULL); 399 400 # endif /* HASFLOCK */ 401 402 break; 403 } 404 405 /* 406 ** Run through the list and send everything. 407 ** 408 ** Set EF_GLOBALERRS so that error messages during delivery 409 ** result in returned mail. 410 */ 411 412 e->e_nsent = 0; 413 e->e_flags |= EF_GLOBALERRS; 414 415 /* now run through the queue */ 416 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 417 { 418 #ifdef XDEBUG 419 char wbuf[MAXNAME + 20]; 420 421 (void) sprintf(wbuf, "sendall(%s)", q->q_paddr); 422 checkfd012(wbuf); 423 #endif 424 if (mode == SM_VERIFY) 425 { 426 e->e_to = q->q_paddr; 427 if (!bitset(QDONTSEND|QBADADDR, q->q_flags)) 428 { 429 if (q->q_host != NULL && q->q_host[0] != '\0') 430 message("deliverable: mailer %s, host %s, user %s", 431 q->q_mailer->m_name, 432 q->q_host, 433 q->q_user); 434 else 435 message("deliverable: mailer %s, user %s", 436 q->q_mailer->m_name, 437 q->q_user); 438 } 439 } 440 else if (!bitset(QDONTSEND|QBADADDR, q->q_flags)) 441 { 442 # ifdef QUEUE 443 /* 444 ** Checkpoint the send list every few addresses 445 */ 446 447 if (e->e_nsent >= CheckpointInterval) 448 { 449 queueup(e, TRUE, FALSE); 450 e->e_nsent = 0; 451 } 452 # endif /* QUEUE */ 453 (void) deliver(e, q); 454 } 455 } 456 Verbose = oldverbose; 457 458 #ifdef XDEBUG 459 checkfd012("end of sendenvelope"); 460 #endif 461 462 if (mode == SM_FORK) 463 finis(); 464 } 465 /* 466 ** DOFORK -- do a fork, retrying a couple of times on failure. 467 ** 468 ** This MUST be a macro, since after a vfork we are running 469 ** two processes on the same stack!!! 470 ** 471 ** Parameters: 472 ** none. 473 ** 474 ** Returns: 475 ** From a macro??? You've got to be kidding! 476 ** 477 ** Side Effects: 478 ** Modifies the ==> LOCAL <== variable 'pid', leaving: 479 ** pid of child in parent, zero in child. 480 ** -1 on unrecoverable error. 481 ** 482 ** Notes: 483 ** I'm awfully sorry this looks so awful. That's 484 ** vfork for you..... 485 */ 486 487 # define NFORKTRIES 5 488 489 # ifndef FORK 490 # define FORK fork 491 # endif 492 493 # define DOFORK(fORKfN) \ 494 {\ 495 register int i;\ 496 \ 497 for (i = NFORKTRIES; --i >= 0; )\ 498 {\ 499 pid = fORKfN();\ 500 if (pid >= 0)\ 501 break;\ 502 if (i > 0)\ 503 sleep((unsigned) NFORKTRIES - i);\ 504 }\ 505 } 506 /* 507 ** DOFORK -- simple fork interface to DOFORK. 508 ** 509 ** Parameters: 510 ** none. 511 ** 512 ** Returns: 513 ** pid of child in parent. 514 ** zero in child. 515 ** -1 on error. 516 ** 517 ** Side Effects: 518 ** returns twice, once in parent and once in child. 519 */ 520 521 dofork() 522 { 523 register int pid; 524 525 DOFORK(fork); 526 return (pid); 527 } 528 /* 529 ** DELIVER -- Deliver a message to a list of addresses. 530 ** 531 ** This routine delivers to everyone on the same host as the 532 ** user on the head of the list. It is clever about mailers 533 ** that don't handle multiple users. It is NOT guaranteed 534 ** that it will deliver to all these addresses however -- so 535 ** deliver should be called once for each address on the 536 ** list. 537 ** 538 ** Parameters: 539 ** e -- the envelope to deliver. 540 ** firstto -- head of the address list to deliver to. 541 ** 542 ** Returns: 543 ** zero -- successfully delivered. 544 ** else -- some failure, see ExitStat for more info. 545 ** 546 ** Side Effects: 547 ** The standard input is passed off to someone. 548 */ 549 550 deliver(e, firstto) 551 register ENVELOPE *e; 552 ADDRESS *firstto; 553 { 554 char *host; /* host being sent to */ 555 char *user; /* user being sent to */ 556 char **pvp; 557 register char **mvp; 558 register char *p; 559 register MAILER *m; /* mailer for this recipient */ 560 ADDRESS *ctladdr; 561 register MCI *mci; 562 register ADDRESS *to = firstto; 563 bool clever = FALSE; /* running user smtp to this mailer */ 564 ADDRESS *tochain = NULL; /* chain of users in this mailer call */ 565 int rcode; /* response code */ 566 char *firstsig; /* signature of firstto */ 567 int pid; 568 char *curhost; 569 int mpvect[2]; 570 int rpvect[2]; 571 char *pv[MAXPV+1]; 572 char tobuf[TOBUFSIZE]; /* text line of to people */ 573 char buf[MAXNAME]; 574 char rpathbuf[MAXNAME]; /* translated return path */ 575 extern int checkcompat(); 576 577 errno = 0; 578 if (bitset(QDONTSEND|QBADADDR|QQUEUEUP, to->q_flags)) 579 return (0); 580 581 #ifdef NAMED_BIND 582 /* unless interactive, try twice, over a minute */ 583 if (OpMode == MD_DAEMON || OpMode == MD_SMTP) 584 { 585 _res.retrans = 30; 586 _res.retry = 2; 587 } 588 #endif 589 590 m = to->q_mailer; 591 host = to->q_host; 592 CurEnv = e; /* just in case */ 593 e->e_statmsg = NULL; 594 SmtpError[0] = '\0'; 595 596 if (tTd(10, 1)) 597 printf("\n--deliver, mailer=%d, host=`%s', first user=`%s'\n", 598 m->m_mno, host, to->q_user); 599 if (tTd(10, 100)) 600 printopenfds(FALSE); 601 602 /* 603 ** If this mailer is expensive, and if we don't want to make 604 ** connections now, just mark these addresses and return. 605 ** This is useful if we want to batch connections to 606 ** reduce load. This will cause the messages to be 607 ** queued up, and a daemon will come along to send the 608 ** messages later. 609 ** This should be on a per-mailer basis. 610 */ 611 612 if (NoConnect && bitnset(M_EXPENSIVE, m->m_flags) && !Verbose) 613 { 614 for (; to != NULL; to = to->q_next) 615 { 616 if (bitset(QDONTSEND|QBADADDR|QQUEUEUP, to->q_flags) || 617 to->q_mailer != m) 618 continue; 619 to->q_flags |= QQUEUEUP; 620 e->e_to = to->q_paddr; 621 message("queued"); 622 if (LogLevel > 8) 623 logdelivery(m, NULL, "queued", NULL, e); 624 } 625 e->e_to = NULL; 626 return (0); 627 } 628 629 /* 630 ** Do initial argv setup. 631 ** Insert the mailer name. Notice that $x expansion is 632 ** NOT done on the mailer name. Then, if the mailer has 633 ** a picky -f flag, we insert it as appropriate. This 634 ** code does not check for 'pv' overflow; this places a 635 ** manifest lower limit of 4 for MAXPV. 636 ** The from address rewrite is expected to make 637 ** the address relative to the other end. 638 */ 639 640 /* rewrite from address, using rewriting rules */ 641 rcode = EX_OK; 642 (void) strcpy(rpathbuf, remotename(e->e_from.q_paddr, m, 643 RF_SENDERADDR|RF_CANONICAL, 644 &rcode, e)); 645 define('g', rpathbuf, e); /* translated return path */ 646 define('h', host, e); /* to host */ 647 Errors = 0; 648 pvp = pv; 649 *pvp++ = m->m_argv[0]; 650 651 /* insert -f or -r flag as appropriate */ 652 if (FromFlag && (bitnset(M_FOPT, m->m_flags) || bitnset(M_ROPT, m->m_flags))) 653 { 654 if (bitnset(M_FOPT, m->m_flags)) 655 *pvp++ = "-f"; 656 else 657 *pvp++ = "-r"; 658 *pvp++ = newstr(rpathbuf); 659 } 660 661 /* 662 ** Append the other fixed parts of the argv. These run 663 ** up to the first entry containing "$u". There can only 664 ** be one of these, and there are only a few more slots 665 ** in the pv after it. 666 */ 667 668 for (mvp = m->m_argv; (p = *++mvp) != NULL; ) 669 { 670 /* can't use strchr here because of sign extension problems */ 671 while (*p != '\0') 672 { 673 if ((*p++ & 0377) == MACROEXPAND) 674 { 675 if (*p == 'u') 676 break; 677 } 678 } 679 680 if (*p != '\0') 681 break; 682 683 /* this entry is safe -- go ahead and process it */ 684 expand(*mvp, buf, &buf[sizeof buf - 1], e); 685 *pvp++ = newstr(buf); 686 if (pvp >= &pv[MAXPV - 3]) 687 { 688 syserr("554 Too many parameters to %s before $u", pv[0]); 689 return (-1); 690 } 691 } 692 693 /* 694 ** If we have no substitution for the user name in the argument 695 ** list, we know that we must supply the names otherwise -- and 696 ** SMTP is the answer!! 697 */ 698 699 if (*mvp == NULL) 700 { 701 /* running SMTP */ 702 # ifdef SMTP 703 clever = TRUE; 704 *pvp = NULL; 705 # else /* SMTP */ 706 /* oops! we don't implement SMTP */ 707 syserr("554 SMTP style mailer not implemented"); 708 return (EX_SOFTWARE); 709 # endif /* SMTP */ 710 } 711 712 /* 713 ** At this point *mvp points to the argument with $u. We 714 ** run through our address list and append all the addresses 715 ** we can. If we run out of space, do not fret! We can 716 ** always send another copy later. 717 */ 718 719 tobuf[0] = '\0'; 720 e->e_to = tobuf; 721 ctladdr = NULL; 722 firstsig = hostsignature(firstto->q_mailer, firstto->q_host, e); 723 for (; to != NULL; to = to->q_next) 724 { 725 /* avoid sending multiple recipients to dumb mailers */ 726 if (tobuf[0] != '\0' && !bitnset(M_MUSER, m->m_flags)) 727 break; 728 729 /* if already sent or not for this host, don't send */ 730 if (bitset(QDONTSEND|QBADADDR|QQUEUEUP, to->q_flags) || 731 to->q_mailer != firstto->q_mailer || 732 strcmp(hostsignature(to->q_mailer, to->q_host, e), firstsig) != 0) 733 continue; 734 735 /* avoid overflowing tobuf */ 736 if (sizeof tobuf < (strlen(to->q_paddr) + strlen(tobuf) + 2)) 737 break; 738 739 if (tTd(10, 1)) 740 { 741 printf("\nsend to "); 742 printaddr(to, FALSE); 743 } 744 745 /* compute effective uid/gid when sending */ 746 /* XXX perhaps this should be to->q_mailer != LocalMailer ?? */ 747 /* XXX perhaps it should be a mailer flag? */ 748 if (to->q_mailer == ProgMailer || to->q_mailer == FileMailer) 749 ctladdr = getctladdr(to); 750 751 user = to->q_user; 752 e->e_to = to->q_paddr; 753 if (tTd(10, 5)) 754 { 755 printf("deliver: QDONTSEND "); 756 printaddr(to, FALSE); 757 } 758 to->q_flags |= QDONTSEND; 759 760 /* 761 ** Check to see that these people are allowed to 762 ** talk to each other. 763 */ 764 765 if (m->m_maxsize != 0 && e->e_msgsize > m->m_maxsize) 766 { 767 NoReturn = TRUE; 768 usrerr("552 Message is too large; %ld bytes max", m->m_maxsize); 769 giveresponse(EX_UNAVAILABLE, m, NULL, ctladdr, e); 770 continue; 771 } 772 rcode = checkcompat(to, e); 773 if (rcode != EX_OK) 774 { 775 markfailure(e, to, rcode); 776 giveresponse(rcode, m, NULL, ctladdr, e); 777 continue; 778 } 779 780 /* 781 ** Strip quote bits from names if the mailer is dumb 782 ** about them. 783 */ 784 785 if (bitnset(M_STRIPQ, m->m_flags)) 786 { 787 stripquotes(user); 788 stripquotes(host); 789 } 790 791 /* hack attack -- delivermail compatibility */ 792 if (m == ProgMailer && *user == '|') 793 user++; 794 795 /* 796 ** If an error message has already been given, don't 797 ** bother to send to this address. 798 ** 799 ** >>>>>>>>>> This clause assumes that the local mailer 800 ** >> NOTE >> cannot do any further aliasing; that 801 ** >>>>>>>>>> function is subsumed by sendmail. 802 */ 803 804 if (bitset(QBADADDR|QQUEUEUP, to->q_flags)) 805 continue; 806 807 /* save statistics.... */ 808 markstats(e, to); 809 810 /* 811 ** See if this user name is "special". 812 ** If the user name has a slash in it, assume that this 813 ** is a file -- send it off without further ado. Note 814 ** that this type of addresses is not processed along 815 ** with the others, so we fudge on the To person. 816 */ 817 818 if (m == FileMailer) 819 { 820 rcode = mailfile(user, ctladdr, e); 821 giveresponse(rcode, m, NULL, ctladdr, e); 822 if (rcode == EX_OK) 823 to->q_flags |= QSENT; 824 continue; 825 } 826 827 /* 828 ** Address is verified -- add this user to mailer 829 ** argv, and add it to the print list of recipients. 830 */ 831 832 /* link together the chain of recipients */ 833 to->q_tchain = tochain; 834 tochain = to; 835 836 /* create list of users for error messages */ 837 (void) strcat(tobuf, ","); 838 (void) strcat(tobuf, to->q_paddr); 839 define('u', user, e); /* to user */ 840 p = to->q_home; 841 if (p == NULL && ctladdr != NULL) 842 p = ctladdr->q_home; 843 define('z', p, e); /* user's home */ 844 845 /* 846 ** Expand out this user into argument list. 847 */ 848 849 if (!clever) 850 { 851 expand(*mvp, buf, &buf[sizeof buf - 1], e); 852 *pvp++ = newstr(buf); 853 if (pvp >= &pv[MAXPV - 2]) 854 { 855 /* allow some space for trailing parms */ 856 break; 857 } 858 } 859 } 860 861 /* see if any addresses still exist */ 862 if (tobuf[0] == '\0') 863 { 864 define('g', (char *) NULL, e); 865 return (0); 866 } 867 868 /* print out messages as full list */ 869 e->e_to = tobuf + 1; 870 871 /* 872 ** Fill out any parameters after the $u parameter. 873 */ 874 875 while (!clever && *++mvp != NULL) 876 { 877 expand(*mvp, buf, &buf[sizeof buf - 1], e); 878 *pvp++ = newstr(buf); 879 if (pvp >= &pv[MAXPV]) 880 syserr("554 deliver: pv overflow after $u for %s", pv[0]); 881 } 882 *pvp++ = NULL; 883 884 /* 885 ** Call the mailer. 886 ** The argument vector gets built, pipes 887 ** are created as necessary, and we fork & exec as 888 ** appropriate. 889 ** If we are running SMTP, we just need to clean up. 890 */ 891 892 /*XXX this seems a bit wierd */ 893 if (ctladdr == NULL && m != ProgMailer && 894 bitset(QGOODUID, e->e_from.q_flags)) 895 ctladdr = &e->e_from; 896 897 #ifdef NAMED_BIND 898 if (ConfigLevel < 2) 899 _res.options &= ~(RES_DEFNAMES | RES_DNSRCH); /* XXX */ 900 #endif 901 902 if (tTd(11, 1)) 903 { 904 printf("openmailer:"); 905 printav(pv); 906 } 907 errno = 0; 908 909 CurHostName = m->m_mailer; 910 911 /* 912 ** Deal with the special case of mail handled through an IPC 913 ** connection. 914 ** In this case we don't actually fork. We must be 915 ** running SMTP for this to work. We will return a 916 ** zero pid to indicate that we are running IPC. 917 ** We also handle a debug version that just talks to stdin/out. 918 */ 919 920 curhost = NULL; 921 SmtpPhase = NULL; 922 mci = NULL; 923 924 #ifdef XDEBUG 925 { 926 char wbuf[MAXLINE]; 927 928 /* make absolutely certain 0, 1, and 2 are in use */ 929 sprintf(wbuf, "%s... openmailer(%s)", e->e_to, m->m_name); 930 checkfd012(wbuf); 931 } 932 #endif 933 934 /* check for Local Person Communication -- not for mortals!!! */ 935 if (strcmp(m->m_mailer, "[LPC]") == 0) 936 { 937 mci = (MCI *) xalloc(sizeof *mci); 938 bzero((char *) mci, sizeof *mci); 939 mci->mci_in = stdin; 940 mci->mci_out = stdout; 941 mci->mci_state = clever ? MCIS_OPENING : MCIS_OPEN; 942 mci->mci_mailer = m; 943 } 944 else if (strcmp(m->m_mailer, "[IPC]") == 0 || 945 strcmp(m->m_mailer, "[TCP]") == 0) 946 { 947 #ifdef DAEMON 948 register int i; 949 register u_short port; 950 951 if (pv[0] == NULL || pv[1] == NULL || pv[1][0] == '\0') 952 { 953 syserr("null host name for %s mailer", m->m_mailer); 954 rcode = EX_CONFIG; 955 goto give_up; 956 } 957 958 CurHostName = pv[1]; 959 curhost = hostsignature(m, pv[1], e); 960 961 if (curhost == NULL || curhost[0] == '\0') 962 { 963 syserr("null host signature for %s", pv[1]); 964 rcode = EX_OSERR; 965 goto give_up; 966 } 967 968 if (!clever) 969 { 970 syserr("554 non-clever IPC"); 971 rcode = EX_CONFIG; 972 goto give_up; 973 } 974 if (pv[2] != NULL) 975 port = atoi(pv[2]); 976 else 977 port = 0; 978 tryhost: 979 while (*curhost != '\0') 980 { 981 register char *p; 982 static char hostbuf[MAXNAME]; 983 984 /* pull the next host from the signature */ 985 p = strchr(curhost, ':'); 986 if (p == NULL) 987 p = &curhost[strlen(curhost)]; 988 if (p == curhost) 989 { 990 syserr("deliver: null host name in signature"); 991 curhost++; 992 continue; 993 } 994 strncpy(hostbuf, curhost, p - curhost); 995 hostbuf[p - curhost] = '\0'; 996 if (*p != '\0') 997 p++; 998 curhost = p; 999 1000 /* see if we already know that this host is fried */ 1001 CurHostName = hostbuf; 1002 mci = mci_get(hostbuf, m); 1003 if (mci->mci_state != MCIS_CLOSED) 1004 { 1005 if (tTd(11, 1)) 1006 { 1007 printf("openmailer: "); 1008 mci_dump(mci, FALSE); 1009 } 1010 CurHostName = mci->mci_host; 1011 break; 1012 } 1013 mci->mci_mailer = m; 1014 if (mci->mci_exitstat != EX_OK) 1015 continue; 1016 1017 /* try the connection */ 1018 setproctitle("%s %s: %s", e->e_id, hostbuf, "user open"); 1019 message("Connecting to %s (%s)...", 1020 hostbuf, m->m_name); 1021 i = makeconnection(hostbuf, port, mci, 1022 bitnset(M_SECURE_PORT, m->m_flags)); 1023 mci->mci_exitstat = i; 1024 mci->mci_errno = errno; 1025 #ifdef NAMED_BIND 1026 mci->mci_herrno = h_errno; 1027 #endif 1028 if (i == EX_OK) 1029 { 1030 mci->mci_state = MCIS_OPENING; 1031 mci_cache(mci); 1032 if (TrafficLogFile != NULL) 1033 fprintf(TrafficLogFile, "%05d == CONNECT %s\n", 1034 getpid(), hostbuf); 1035 break; 1036 } 1037 else if (tTd(11, 1)) 1038 printf("openmailer: makeconnection => stat=%d, errno=%d\n", 1039 i, errno); 1040 1041 /* enter status of this host */ 1042 setstat(i); 1043 1044 /* should print some message here for -v mode */ 1045 } 1046 if (mci == NULL) 1047 { 1048 syserr("deliver: no host name"); 1049 rcode = EX_OSERR; 1050 goto give_up; 1051 } 1052 mci->mci_pid = 0; 1053 #else /* no DAEMON */ 1054 syserr("554 openmailer: no IPC"); 1055 if (tTd(11, 1)) 1056 printf("openmailer: NULL\n"); 1057 rcode = EX_UNAVAILABLE; 1058 goto give_up; 1059 #endif /* DAEMON */ 1060 } 1061 else 1062 { 1063 if (TrafficLogFile != NULL) 1064 { 1065 char **av; 1066 1067 fprintf(TrafficLogFile, "%05d === EXEC", getpid()); 1068 for (av = pv; *av != NULL; av++) 1069 fprintf(TrafficLogFile, " %s", *av); 1070 fprintf(TrafficLogFile, "\n"); 1071 } 1072 1073 /* create a pipe to shove the mail through */ 1074 if (pipe(mpvect) < 0) 1075 { 1076 syserr("%s... openmailer(%s): pipe (to mailer)", 1077 e->e_to, m->m_name); 1078 if (tTd(11, 1)) 1079 printf("openmailer: NULL\n"); 1080 rcode = EX_OSERR; 1081 goto give_up; 1082 } 1083 1084 /* if this mailer speaks smtp, create a return pipe */ 1085 if (clever && pipe(rpvect) < 0) 1086 { 1087 syserr("%s... openmailer(%s): pipe (from mailer)", 1088 e->e_to, m->m_name); 1089 (void) close(mpvect[0]); 1090 (void) close(mpvect[1]); 1091 if (tTd(11, 1)) 1092 printf("openmailer: NULL\n"); 1093 rcode = EX_OSERR; 1094 goto give_up; 1095 } 1096 1097 /* 1098 ** Actually fork the mailer process. 1099 ** DOFORK is clever about retrying. 1100 ** 1101 ** Dispose of SIGCHLD signal catchers that may be laying 1102 ** around so that endmail will get it. 1103 */ 1104 1105 if (e->e_xfp != NULL) 1106 (void) fflush(e->e_xfp); /* for debugging */ 1107 (void) fflush(stdout); 1108 # ifdef SIGCHLD 1109 (void) setsignal(SIGCHLD, SIG_DFL); 1110 # endif /* SIGCHLD */ 1111 DOFORK(FORK); 1112 /* pid is set by DOFORK */ 1113 if (pid < 0) 1114 { 1115 /* failure */ 1116 syserr("%s... openmailer(%s): cannot fork", 1117 e->e_to, m->m_name); 1118 (void) close(mpvect[0]); 1119 (void) close(mpvect[1]); 1120 if (clever) 1121 { 1122 (void) close(rpvect[0]); 1123 (void) close(rpvect[1]); 1124 } 1125 if (tTd(11, 1)) 1126 printf("openmailer: NULL\n"); 1127 rcode = EX_OSERR; 1128 goto give_up; 1129 } 1130 else if (pid == 0) 1131 { 1132 int i; 1133 int saveerrno; 1134 char **ep; 1135 char *env[MAXUSERENVIRON]; 1136 extern char **environ; 1137 extern int DtableSize; 1138 1139 /* child -- set up input & exec mailer */ 1140 (void) setsignal(SIGINT, SIG_IGN); 1141 (void) setsignal(SIGHUP, SIG_IGN); 1142 (void) setsignal(SIGTERM, SIG_DFL); 1143 1144 /* reset user and group */ 1145 if (!bitnset(M_RESTR, m->m_flags)) 1146 { 1147 if (ctladdr == NULL || ctladdr->q_uid == 0) 1148 { 1149 (void) initgroups(DefUser, DefGid); 1150 (void) setgid(DefGid); 1151 (void) setuid(DefUid); 1152 } 1153 else 1154 { 1155 (void) initgroups(ctladdr->q_ruser? 1156 ctladdr->q_ruser: ctladdr->q_user, 1157 ctladdr->q_gid); 1158 (void) setgid(ctladdr->q_gid); 1159 (void) setuid(ctladdr->q_uid); 1160 } 1161 } 1162 1163 if (tTd(11, 2)) 1164 printf("openmailer: running as r/euid=%d/%d\n", 1165 getuid(), geteuid()); 1166 1167 /* move into some "safe" directory */ 1168 if (m->m_execdir != NULL) 1169 { 1170 char *p, *q; 1171 char buf[MAXLINE]; 1172 1173 for (p = m->m_execdir; p != NULL; p = q) 1174 { 1175 q = strchr(p, ':'); 1176 if (q != NULL) 1177 *q = '\0'; 1178 expand(p, buf, &buf[sizeof buf] - 1, e); 1179 if (q != NULL) 1180 *q++ = ':'; 1181 if (tTd(11, 20)) 1182 printf("openmailer: trydir %s\n", 1183 buf); 1184 if (buf[0] != '\0' && chdir(buf) >= 0) 1185 break; 1186 } 1187 } 1188 1189 /* arrange to filter std & diag output of command */ 1190 if (clever) 1191 { 1192 (void) close(rpvect[0]); 1193 if (dup2(rpvect[1], STDOUT_FILENO) < 0) 1194 { 1195 syserr("%s... openmailer(%s): cannot dup pipe %d for stdout", 1196 e->e_to, m->m_name, rpvect[1]); 1197 _exit(EX_OSERR); 1198 } 1199 (void) close(rpvect[1]); 1200 } 1201 else if (OpMode == MD_SMTP || OpMode == MD_DAEMON || HoldErrs) 1202 { 1203 /* put mailer output in transcript */ 1204 if (dup2(fileno(e->e_xfp), STDOUT_FILENO) < 0) 1205 { 1206 syserr("%s... openmailer(%s): cannot dup xscript %d for stdout", 1207 e->e_to, m->m_name, 1208 fileno(e->e_xfp)); 1209 _exit(EX_OSERR); 1210 } 1211 } 1212 if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) 1213 { 1214 syserr("%s... openmailer(%s): cannot dup stdout for stderr", 1215 e->e_to, m->m_name); 1216 _exit(EX_OSERR); 1217 } 1218 1219 /* arrange to get standard input */ 1220 (void) close(mpvect[1]); 1221 if (dup2(mpvect[0], STDIN_FILENO) < 0) 1222 { 1223 syserr("%s... openmailer(%s): cannot dup pipe %d for stdin", 1224 e->e_to, m->m_name, mpvect[0]); 1225 _exit(EX_OSERR); 1226 } 1227 (void) close(mpvect[0]); 1228 1229 /* arrange for all the files to be closed */ 1230 for (i = 3; i < DtableSize; i++) 1231 { 1232 register int j; 1233 1234 if ((j = fcntl(i, F_GETFD, 0)) != -1) 1235 (void) fcntl(i, F_SETFD, j | 1); 1236 } 1237 1238 /* set up the mailer environment */ 1239 i = 0; 1240 env[i++] = "AGENT=sendmail"; 1241 for (ep = environ; *ep != NULL; ep++) 1242 { 1243 if (strncmp(*ep, "TZ=", 3) == 0) 1244 env[i++] = *ep; 1245 } 1246 env[i++] = NULL; 1247 1248 /* try to execute the mailer */ 1249 execve(m->m_mailer, pv, env); 1250 saveerrno = errno; 1251 syserr("Cannot exec %s", m->m_mailer); 1252 if (m == LocalMailer || transienterror(saveerrno)) 1253 _exit(EX_OSERR); 1254 _exit(EX_UNAVAILABLE); 1255 } 1256 1257 /* 1258 ** Set up return value. 1259 */ 1260 1261 mci = (MCI *) xalloc(sizeof *mci); 1262 bzero((char *) mci, sizeof *mci); 1263 mci->mci_mailer = m; 1264 mci->mci_state = clever ? MCIS_OPENING : MCIS_OPEN; 1265 mci->mci_pid = pid; 1266 (void) close(mpvect[0]); 1267 mci->mci_out = fdopen(mpvect[1], "w"); 1268 if (mci->mci_out == NULL) 1269 { 1270 syserr("deliver: cannot create mailer output channel, fd=%d", 1271 mpvect[1]); 1272 (void) close(mpvect[1]); 1273 if (clever) 1274 { 1275 (void) close(rpvect[0]); 1276 (void) close(rpvect[1]); 1277 } 1278 rcode = EX_OSERR; 1279 goto give_up; 1280 } 1281 if (clever) 1282 { 1283 (void) close(rpvect[1]); 1284 mci->mci_in = fdopen(rpvect[0], "r"); 1285 if (mci->mci_in == NULL) 1286 { 1287 syserr("deliver: cannot create mailer input channel, fd=%d", 1288 mpvect[1]); 1289 (void) close(rpvect[0]); 1290 fclose(mci->mci_out); 1291 mci->mci_out = NULL; 1292 rcode = EX_OSERR; 1293 goto give_up; 1294 } 1295 } 1296 else 1297 { 1298 mci->mci_flags |= MCIF_TEMP; 1299 mci->mci_in = NULL; 1300 } 1301 } 1302 1303 /* 1304 ** If we are in SMTP opening state, send initial protocol. 1305 */ 1306 1307 if (clever && mci->mci_state != MCIS_CLOSED) 1308 { 1309 smtpinit(m, mci, e); 1310 } 1311 if (tTd(11, 1)) 1312 { 1313 printf("openmailer: "); 1314 mci_dump(mci, FALSE); 1315 } 1316 1317 if (mci->mci_state != MCIS_OPEN) 1318 { 1319 /* couldn't open the mailer */ 1320 rcode = mci->mci_exitstat; 1321 errno = mci->mci_errno; 1322 #ifdef NAMED_BIND 1323 h_errno = mci->mci_herrno; 1324 #endif 1325 if (rcode == EX_OK) 1326 { 1327 /* shouldn't happen */ 1328 syserr("554 deliver: rcode=%d, mci_state=%d, sig=%s", 1329 rcode, mci->mci_state, firstsig); 1330 rcode = EX_SOFTWARE; 1331 } 1332 else if (rcode == EX_TEMPFAIL && curhost != NULL && *curhost != '\0') 1333 { 1334 /* try next MX site */ 1335 goto tryhost; 1336 } 1337 } 1338 else if (!clever) 1339 { 1340 /* 1341 ** Format and send message. 1342 */ 1343 1344 putfromline(mci->mci_out, m, e); 1345 (*e->e_puthdr)(mci->mci_out, m, e); 1346 putline("\n", mci->mci_out, m); 1347 (*e->e_putbody)(mci->mci_out, m, e, NULL); 1348 1349 /* get the exit status */ 1350 rcode = endmailer(mci, e, pv); 1351 } 1352 else 1353 #ifdef SMTP 1354 { 1355 /* 1356 ** Send the MAIL FROM: protocol 1357 */ 1358 1359 rcode = smtpmailfrom(m, mci, e); 1360 if (rcode == EX_OK) 1361 { 1362 register char *t = tobuf; 1363 register int i; 1364 1365 /* send the recipient list */ 1366 tobuf[0] = '\0'; 1367 for (to = tochain; to != NULL; to = to->q_tchain) 1368 { 1369 e->e_to = to->q_paddr; 1370 if ((i = smtprcpt(to, m, mci, e)) != EX_OK) 1371 { 1372 markfailure(e, to, i); 1373 giveresponse(i, m, mci, ctladdr, e); 1374 } 1375 else 1376 { 1377 *t++ = ','; 1378 for (p = to->q_paddr; *p; *t++ = *p++) 1379 continue; 1380 *t = '\0'; 1381 } 1382 } 1383 1384 /* now send the data */ 1385 if (tobuf[0] == '\0') 1386 { 1387 rcode = EX_OK; 1388 e->e_to = NULL; 1389 if (bitset(MCIF_CACHED, mci->mci_flags)) 1390 smtprset(m, mci, e); 1391 } 1392 else 1393 { 1394 e->e_to = tobuf + 1; 1395 rcode = smtpdata(m, mci, e); 1396 } 1397 1398 /* now close the connection */ 1399 if (!bitset(MCIF_CACHED, mci->mci_flags)) 1400 smtpquit(m, mci, e); 1401 } 1402 if (rcode != EX_OK && curhost != NULL && *curhost != '\0') 1403 { 1404 /* try next MX site */ 1405 goto tryhost; 1406 } 1407 } 1408 #else /* not SMTP */ 1409 { 1410 syserr("554 deliver: need SMTP compiled to use clever mailer"); 1411 rcode = EX_CONFIG; 1412 goto give_up; 1413 } 1414 #endif /* SMTP */ 1415 #ifdef NAMED_BIND 1416 if (ConfigLevel < 2) 1417 _res.options |= RES_DEFNAMES | RES_DNSRCH; /* XXX */ 1418 #endif 1419 1420 /* arrange a return receipt if requested */ 1421 if (rcode == EX_OK && e->e_receiptto != NULL && 1422 bitnset(M_LOCALMAILER, m->m_flags)) 1423 { 1424 e->e_flags |= EF_SENDRECEIPT; 1425 /* do we want to send back more info? */ 1426 } 1427 1428 /* 1429 ** Do final status disposal. 1430 ** We check for something in tobuf for the SMTP case. 1431 ** If we got a temporary failure, arrange to queue the 1432 ** addressees. 1433 */ 1434 1435 give_up: 1436 if (tobuf[0] != '\0') 1437 giveresponse(rcode, m, mci, ctladdr, e); 1438 for (to = tochain; to != NULL; to = to->q_tchain) 1439 { 1440 if (rcode != EX_OK) 1441 markfailure(e, to, rcode); 1442 else 1443 { 1444 to->q_flags |= QSENT; 1445 e->e_nsent++; 1446 if (e->e_receiptto != NULL && 1447 bitnset(M_LOCALMAILER, m->m_flags)) 1448 { 1449 fprintf(e->e_xfp, "%s... Successfully delivered\n", 1450 to->q_paddr); 1451 } 1452 } 1453 } 1454 1455 /* 1456 ** Restore state and return. 1457 */ 1458 1459 #ifdef XDEBUG 1460 { 1461 char wbuf[MAXLINE]; 1462 1463 /* make absolutely certain 0, 1, and 2 are in use */ 1464 sprintf(wbuf, "%s... end of deliver(%s)", 1465 e->e_to == NULL ? "NO-TO-LIST" : e->e_to, 1466 m->m_name); 1467 checkfd012(wbuf); 1468 } 1469 #endif 1470 1471 errno = 0; 1472 define('g', (char *) NULL, e); 1473 return (rcode); 1474 } 1475 /* 1476 ** MARKFAILURE -- mark a failure on a specific address. 1477 ** 1478 ** Parameters: 1479 ** e -- the envelope we are sending. 1480 ** q -- the address to mark. 1481 ** rcode -- the code signifying the particular failure. 1482 ** 1483 ** Returns: 1484 ** none. 1485 ** 1486 ** Side Effects: 1487 ** marks the address (and possibly the envelope) with the 1488 ** failure so that an error will be returned or 1489 ** the message will be queued, as appropriate. 1490 */ 1491 1492 markfailure(e, q, rcode) 1493 register ENVELOPE *e; 1494 register ADDRESS *q; 1495 int rcode; 1496 { 1497 char buf[MAXLINE]; 1498 1499 switch (rcode) 1500 { 1501 case EX_OK: 1502 break; 1503 1504 case EX_TEMPFAIL: 1505 case EX_IOERR: 1506 case EX_OSERR: 1507 q->q_flags |= QQUEUEUP; 1508 break; 1509 1510 default: 1511 q->q_flags |= QBADADDR; 1512 break; 1513 } 1514 } 1515 /* 1516 ** ENDMAILER -- Wait for mailer to terminate. 1517 ** 1518 ** We should never get fatal errors (e.g., segmentation 1519 ** violation), so we report those specially. For other 1520 ** errors, we choose a status message (into statmsg), 1521 ** and if it represents an error, we print it. 1522 ** 1523 ** Parameters: 1524 ** pid -- pid of mailer. 1525 ** e -- the current envelope. 1526 ** pv -- the parameter vector that invoked the mailer 1527 ** (for error messages). 1528 ** 1529 ** Returns: 1530 ** exit code of mailer. 1531 ** 1532 ** Side Effects: 1533 ** none. 1534 */ 1535 1536 endmailer(mci, e, pv) 1537 register MCI *mci; 1538 register ENVELOPE *e; 1539 char **pv; 1540 { 1541 int st; 1542 1543 /* close any connections */ 1544 if (mci->mci_in != NULL) 1545 (void) xfclose(mci->mci_in, mci->mci_mailer->m_name, "mci_in"); 1546 if (mci->mci_out != NULL) 1547 (void) xfclose(mci->mci_out, mci->mci_mailer->m_name, "mci_out"); 1548 mci->mci_in = mci->mci_out = NULL; 1549 mci->mci_state = MCIS_CLOSED; 1550 1551 /* in the IPC case there is nothing to wait for */ 1552 if (mci->mci_pid == 0) 1553 return (EX_OK); 1554 1555 /* wait for the mailer process to die and collect status */ 1556 st = waitfor(mci->mci_pid); 1557 if (st == -1) 1558 { 1559 syserr("endmailer %s: wait", pv[0]); 1560 return (EX_SOFTWARE); 1561 } 1562 1563 if (WIFEXITED(st)) 1564 { 1565 /* normal death -- return status */ 1566 return (WEXITSTATUS(st)); 1567 } 1568 1569 /* it died a horrid death */ 1570 syserr("451 mailer %s died with signal %o", 1571 mci->mci_mailer->m_name, st); 1572 1573 /* log the arguments */ 1574 if (pv != NULL && e->e_xfp != NULL) 1575 { 1576 register char **av; 1577 1578 fprintf(e->e_xfp, "Arguments:"); 1579 for (av = pv; *av != NULL; av++) 1580 fprintf(e->e_xfp, " %s", *av); 1581 fprintf(e->e_xfp, "\n"); 1582 } 1583 1584 ExitStat = EX_TEMPFAIL; 1585 return (EX_TEMPFAIL); 1586 } 1587 /* 1588 ** GIVERESPONSE -- Interpret an error response from a mailer 1589 ** 1590 ** Parameters: 1591 ** stat -- the status code from the mailer (high byte 1592 ** only; core dumps must have been taken care of 1593 ** already). 1594 ** m -- the mailer info for this mailer. 1595 ** mci -- the mailer connection info -- can be NULL if the 1596 ** response is given before the connection is made. 1597 ** ctladdr -- the controlling address for the recipient 1598 ** address(es). 1599 ** e -- the current envelope. 1600 ** 1601 ** Returns: 1602 ** none. 1603 ** 1604 ** Side Effects: 1605 ** Errors may be incremented. 1606 ** ExitStat may be set. 1607 */ 1608 1609 giveresponse(stat, m, mci, ctladdr, e) 1610 int stat; 1611 register MAILER *m; 1612 register MCI *mci; 1613 ADDRESS *ctladdr; 1614 ENVELOPE *e; 1615 { 1616 register const char *statmsg; 1617 extern char *SysExMsg[]; 1618 register int i; 1619 extern int N_SysEx; 1620 char buf[MAXLINE]; 1621 1622 /* 1623 ** Compute status message from code. 1624 */ 1625 1626 i = stat - EX__BASE; 1627 if (stat == 0) 1628 { 1629 statmsg = "250 Sent"; 1630 if (e->e_statmsg != NULL) 1631 { 1632 (void) sprintf(buf, "%s (%s)", statmsg, e->e_statmsg); 1633 statmsg = buf; 1634 } 1635 } 1636 else if (i < 0 || i > N_SysEx) 1637 { 1638 (void) sprintf(buf, "554 unknown mailer error %d", stat); 1639 stat = EX_UNAVAILABLE; 1640 statmsg = buf; 1641 } 1642 else if (stat == EX_TEMPFAIL) 1643 { 1644 (void) strcpy(buf, SysExMsg[i] + 1); 1645 #ifdef NAMED_BIND 1646 if (h_errno == TRY_AGAIN) 1647 statmsg = errstring(h_errno+E_DNSBASE); 1648 else 1649 #endif 1650 { 1651 if (errno != 0) 1652 statmsg = errstring(errno); 1653 else 1654 { 1655 #ifdef SMTP 1656 statmsg = SmtpError; 1657 #else /* SMTP */ 1658 statmsg = NULL; 1659 #endif /* SMTP */ 1660 } 1661 } 1662 if (statmsg != NULL && statmsg[0] != '\0') 1663 { 1664 (void) strcat(buf, ": "); 1665 (void) strcat(buf, statmsg); 1666 } 1667 statmsg = buf; 1668 } 1669 #ifdef NAMED_BIND 1670 else if (stat == EX_NOHOST && h_errno != 0) 1671 { 1672 statmsg = errstring(h_errno + E_DNSBASE); 1673 (void) sprintf(buf, "%s (%s)", SysExMsg[i], statmsg); 1674 statmsg = buf; 1675 } 1676 #endif 1677 else 1678 { 1679 statmsg = SysExMsg[i]; 1680 if (*statmsg++ == ':') 1681 { 1682 (void) sprintf(buf, "%s: %s", statmsg, errstring(errno)); 1683 statmsg = buf; 1684 } 1685 } 1686 1687 /* 1688 ** Print the message as appropriate 1689 */ 1690 1691 if (stat == EX_OK || stat == EX_TEMPFAIL) 1692 { 1693 extern char MsgBuf[]; 1694 1695 message(&statmsg[4], errstring(errno)); 1696 if (stat == EX_TEMPFAIL && e->e_xfp != NULL) 1697 fprintf(e->e_xfp, "%s\n", &MsgBuf[4]); 1698 } 1699 else 1700 { 1701 Errors++; 1702 usrerr(statmsg, errstring(errno)); 1703 } 1704 1705 /* 1706 ** Final cleanup. 1707 ** Log a record of the transaction. Compute the new 1708 ** ExitStat -- if we already had an error, stick with 1709 ** that. 1710 */ 1711 1712 if (LogLevel > ((stat == EX_TEMPFAIL) ? 8 : (stat == EX_OK) ? 7 : 6)) 1713 logdelivery(m, mci, &statmsg[4], ctladdr, e); 1714 1715 if (stat != EX_TEMPFAIL) 1716 setstat(stat); 1717 if (stat != EX_OK && (stat != EX_TEMPFAIL || e->e_message == NULL)) 1718 { 1719 if (e->e_message != NULL) 1720 free(e->e_message); 1721 e->e_message = newstr(&statmsg[4]); 1722 } 1723 errno = 0; 1724 #ifdef NAMED_BIND 1725 h_errno = 0; 1726 #endif 1727 } 1728 /* 1729 ** LOGDELIVERY -- log the delivery in the system log 1730 ** 1731 ** Care is taken to avoid logging lines that are too long, because 1732 ** some versions of syslog have an unfortunate proclivity for core 1733 ** dumping. This is a hack, to be sure, that is at best empirical. 1734 ** 1735 ** Parameters: 1736 ** m -- the mailer info. Can be NULL for initial queue. 1737 ** mci -- the mailer connection info -- can be NULL if the 1738 ** log is occuring when no connection is active. 1739 ** stat -- the message to print for the status. 1740 ** ctladdr -- the controlling address for the to list. 1741 ** e -- the current envelope. 1742 ** 1743 ** Returns: 1744 ** none 1745 ** 1746 ** Side Effects: 1747 ** none 1748 */ 1749 1750 logdelivery(m, mci, stat, ctladdr, e) 1751 MAILER *m; 1752 register MCI *mci; 1753 char *stat; 1754 ADDRESS *ctladdr; 1755 register ENVELOPE *e; 1756 { 1757 # ifdef LOG 1758 register char *bp; 1759 register char *p; 1760 int l; 1761 char buf[512]; 1762 1763 # if (SYSLOG_BUFSIZE) >= 256 1764 bp = buf; 1765 if (ctladdr != NULL) 1766 { 1767 strcpy(bp, ", ctladdr="); 1768 strcat(bp, shortenstring(ctladdr->q_paddr, 83)); 1769 bp += strlen(bp); 1770 if (bitset(QGOODUID, ctladdr->q_flags)) 1771 { 1772 (void) sprintf(bp, " (%d/%d)", 1773 ctladdr->q_uid, ctladdr->q_gid); 1774 bp += strlen(bp); 1775 } 1776 } 1777 1778 (void) sprintf(bp, ", delay=%s", pintvl(curtime() - e->e_ctime, TRUE)); 1779 bp += strlen(bp); 1780 1781 if (m != NULL) 1782 { 1783 (void) strcpy(bp, ", mailer="); 1784 (void) strcat(bp, m->m_name); 1785 bp += strlen(bp); 1786 } 1787 1788 if (mci != NULL && mci->mci_host != NULL) 1789 { 1790 # ifdef DAEMON 1791 extern SOCKADDR CurHostAddr; 1792 # endif 1793 1794 (void) strcpy(bp, ", relay="); 1795 (void) strcat(bp, mci->mci_host); 1796 1797 # ifdef DAEMON 1798 (void) strcat(bp, " ("); 1799 (void) strcat(bp, anynet_ntoa(&CurHostAddr)); 1800 (void) strcat(bp, ")"); 1801 # endif 1802 } 1803 else 1804 { 1805 char *p = macvalue('h', e); 1806 1807 if (p != NULL && p[0] != '\0') 1808 { 1809 (void) strcpy(bp, ", relay="); 1810 (void) strcat(bp, p); 1811 } 1812 } 1813 bp += strlen(bp); 1814 1815 #define STATLEN (((SYSLOG_BUFSIZE) - 100) / 4) 1816 #if (STATLEN) < 63 1817 # undef STATLEN 1818 # define STATLEN 63 1819 #endif 1820 #if (STATLEN) > 203 1821 # undef STATLEN 1822 # define STATLEN 203 1823 #endif 1824 1825 if ((bp - buf) > (sizeof buf - ((STATLEN) + 20))) 1826 { 1827 /* desperation move -- truncate data */ 1828 bp = buf + sizeof buf - ((STATLEN) + 17); 1829 strcpy(bp, "..."); 1830 bp += 3; 1831 } 1832 1833 (void) strcpy(bp, ", stat="); 1834 bp += strlen(bp); 1835 1836 (void) strcpy(bp, shortenstring(stat, (STATLEN))); 1837 1838 l = SYSLOG_BUFSIZE - 100 - strlen(buf); 1839 p = e->e_to; 1840 while (strlen(p) >= l) 1841 { 1842 register char *q = strchr(p + l, ','); 1843 1844 if (q == NULL) 1845 break; 1846 syslog(LOG_INFO, "%s: to=%.*s [more]%s", 1847 e->e_id, ++q - p, p, buf); 1848 p = q; 1849 } 1850 syslog(LOG_INFO, "%s: to=%s%s", e->e_id, p, buf); 1851 1852 # else /* we have a very short log buffer size */ 1853 1854 l = SYSLOG_BUFSIZE - 80; 1855 p = e->e_to; 1856 while (strlen(p) >= l) 1857 { 1858 register char *q = strchr(p + l, ','); 1859 1860 if (q == NULL) 1861 break; 1862 syslog(LOG_INFO, "%s: to=%.*s [more]", 1863 e->e_id, ++q - p, p); 1864 p = q; 1865 } 1866 syslog(LOG_INFO, "%s: to=%s", e->e_id, p); 1867 1868 if (ctladdr != NULL) 1869 { 1870 bp = buf; 1871 strcpy(buf, "ctladdr="); 1872 bp += strlen(buf); 1873 strcpy(bp, shortenstring(ctladdr->q_paddr, 83)); 1874 bp += strlen(buf); 1875 if (bitset(QGOODUID, ctladdr->q_flags)) 1876 { 1877 (void) sprintf(bp, " (%d/%d)", 1878 ctladdr->q_uid, ctladdr->q_gid); 1879 bp += strlen(bp); 1880 } 1881 syslog(LOG_INFO, "%s: %s", e->e_id, buf); 1882 } 1883 bp = buf; 1884 sprintf(bp, "delay=%s", pintvl(curtime() - e->e_ctime, TRUE)); 1885 bp += strlen(bp); 1886 1887 if (m != NULL) 1888 { 1889 sprintf(bp, ", mailer=%s", m->m_name); 1890 bp += strlen(bp); 1891 } 1892 1893 if (mci != NULL && mci->mci_host != NULL) 1894 { 1895 # ifdef DAEMON 1896 extern SOCKADDR CurHostAddr; 1897 # endif 1898 1899 sprintf(bp, ", relay=%s", mci->mci_host); 1900 1901 # ifdef DAEMON 1902 (void) strcat(bp, " ("); 1903 (void) strcat(bp, anynet_ntoa(&CurHostAddr)); 1904 (void) strcat(bp, ")"); 1905 # endif 1906 } 1907 else 1908 { 1909 char *p = macvalue('h', e); 1910 1911 if (p != NULL && p[0] != '\0') 1912 sprintf(bp, ", relay=%s", p); 1913 } 1914 syslog(LOG_INFO, "%s: %s", e->e_id, buf); 1915 1916 syslog(LOG_INFO, "%s: stat=%s", e->e_id, shortenstring(stat, 63)); 1917 # endif /* short log buffer */ 1918 # endif /* LOG */ 1919 } 1920 /* 1921 ** PUTFROMLINE -- output a UNIX-style from line (or whatever) 1922 ** 1923 ** This can be made an arbitrary message separator by changing $l 1924 ** 1925 ** One of the ugliest hacks seen by human eyes is contained herein: 1926 ** UUCP wants those stupid "remote from <host>" lines. Why oh why 1927 ** does a well-meaning programmer such as myself have to deal with 1928 ** this kind of antique garbage???? 1929 ** 1930 ** Parameters: 1931 ** fp -- the file to output to. 1932 ** m -- the mailer describing this entry. 1933 ** 1934 ** Returns: 1935 ** none 1936 ** 1937 ** Side Effects: 1938 ** outputs some text to fp. 1939 */ 1940 1941 putfromline(fp, m, e) 1942 register FILE *fp; 1943 register MAILER *m; 1944 ENVELOPE *e; 1945 { 1946 char *template = "\201l\n"; 1947 char buf[MAXLINE]; 1948 1949 if (bitnset(M_NHDR, m->m_flags)) 1950 return; 1951 1952 # ifdef UGLYUUCP 1953 if (bitnset(M_UGLYUUCP, m->m_flags)) 1954 { 1955 char *bang; 1956 char xbuf[MAXLINE]; 1957 1958 expand("\201g", buf, &buf[sizeof buf - 1], e); 1959 bang = strchr(buf, '!'); 1960 if (bang == NULL) 1961 { 1962 errno = 0; 1963 syserr("554 No ! in UUCP From address! (%s given)", buf); 1964 } 1965 else 1966 { 1967 *bang++ = '\0'; 1968 (void) sprintf(xbuf, "From %s \201d remote from %s\n", bang, buf); 1969 template = xbuf; 1970 } 1971 } 1972 # endif /* UGLYUUCP */ 1973 expand(template, buf, &buf[sizeof buf - 1], e); 1974 putline(buf, fp, m); 1975 } 1976 /* 1977 ** PUTBODY -- put the body of a message. 1978 ** 1979 ** Parameters: 1980 ** fp -- file to output onto. 1981 ** m -- a mailer descriptor to control output format. 1982 ** e -- the envelope to put out. 1983 ** separator -- if non-NULL, a message separator that must 1984 ** not be permitted in the resulting message. 1985 ** 1986 ** Returns: 1987 ** none. 1988 ** 1989 ** Side Effects: 1990 ** The message is written onto fp. 1991 */ 1992 1993 putbody(fp, m, e, separator) 1994 FILE *fp; 1995 MAILER *m; 1996 register ENVELOPE *e; 1997 char *separator; 1998 { 1999 char buf[MAXLINE]; 2000 2001 /* 2002 ** Output the body of the message 2003 */ 2004 2005 if (e->e_dfp == NULL) 2006 { 2007 if (e->e_df != NULL) 2008 { 2009 e->e_dfp = fopen(e->e_df, "r"); 2010 if (e->e_dfp == NULL) 2011 syserr("putbody: Cannot open %s for %s from %s", 2012 e->e_df, e->e_to, e->e_from.q_paddr); 2013 } 2014 else 2015 putline("<<< No Message Collected >>>", fp, m); 2016 } 2017 if (e->e_dfp != NULL) 2018 { 2019 rewind(e->e_dfp); 2020 while (!ferror(fp) && fgets(buf, sizeof buf, e->e_dfp) != NULL) 2021 { 2022 if (buf[0] == 'F' && bitnset(M_ESCFROM, m->m_flags) && 2023 strncmp(buf, "From ", 5) == 0) 2024 (void) putc('>', fp); 2025 if (buf[0] == '-' && buf[1] == '-' && separator != NULL) 2026 { 2027 /* possible separator */ 2028 int sl = strlen(separator); 2029 2030 if (strncmp(&buf[2], separator, sl) == 0) 2031 (void) putc(' ', fp); 2032 } 2033 putline(buf, fp, m); 2034 } 2035 2036 if (ferror(e->e_dfp)) 2037 { 2038 syserr("putbody: %s: read error", e->e_df); 2039 ExitStat = EX_IOERR; 2040 } 2041 } 2042 2043 /* some mailers want extra blank line at end of message */ 2044 if (bitnset(M_BLANKEND, m->m_flags) && buf[0] != '\0' && buf[0] != '\n') 2045 putline("", fp, m); 2046 2047 (void) fflush(fp); 2048 if (ferror(fp) && errno != EPIPE) 2049 { 2050 syserr("putbody: write error"); 2051 ExitStat = EX_IOERR; 2052 } 2053 errno = 0; 2054 } 2055 /* 2056 ** MAILFILE -- Send a message to a file. 2057 ** 2058 ** If the file has the setuid/setgid bits set, but NO execute 2059 ** bits, sendmail will try to become the owner of that file 2060 ** rather than the real user. Obviously, this only works if 2061 ** sendmail runs as root. 2062 ** 2063 ** This could be done as a subordinate mailer, except that it 2064 ** is used implicitly to save messages in ~/dead.letter. We 2065 ** view this as being sufficiently important as to include it 2066 ** here. For example, if the system is dying, we shouldn't have 2067 ** to create another process plus some pipes to save the message. 2068 ** 2069 ** Parameters: 2070 ** filename -- the name of the file to send to. 2071 ** ctladdr -- the controlling address header -- includes 2072 ** the userid/groupid to be when sending. 2073 ** 2074 ** Returns: 2075 ** The exit code associated with the operation. 2076 ** 2077 ** Side Effects: 2078 ** none. 2079 */ 2080 2081 mailfile(filename, ctladdr, e) 2082 char *filename; 2083 ADDRESS *ctladdr; 2084 register ENVELOPE *e; 2085 { 2086 register FILE *f; 2087 register int pid; 2088 int mode; 2089 2090 if (tTd(11, 1)) 2091 { 2092 printf("mailfile %s\n ctladdr=", filename); 2093 printaddr(ctladdr, FALSE); 2094 } 2095 2096 if (e->e_xfp != NULL) 2097 fflush(e->e_xfp); 2098 2099 /* 2100 ** Fork so we can change permissions here. 2101 ** Note that we MUST use fork, not vfork, because of 2102 ** the complications of calling subroutines, etc. 2103 */ 2104 2105 DOFORK(fork); 2106 2107 if (pid < 0) 2108 return (EX_OSERR); 2109 else if (pid == 0) 2110 { 2111 /* child -- actually write to file */ 2112 struct stat stb; 2113 2114 (void) setsignal(SIGINT, SIG_DFL); 2115 (void) setsignal(SIGHUP, SIG_DFL); 2116 (void) setsignal(SIGTERM, SIG_DFL); 2117 (void) umask(OldUmask); 2118 2119 if (stat(filename, &stb) < 0) 2120 stb.st_mode = FileMode; 2121 mode = stb.st_mode; 2122 2123 /* limit the errors to those actually caused in the child */ 2124 errno = 0; 2125 ExitStat = EX_OK; 2126 2127 if (bitset(0111, stb.st_mode)) 2128 exit(EX_CANTCREAT); 2129 if (ctladdr != NULL) 2130 { 2131 /* ignore setuid and setgid bits */ 2132 mode &= ~(S_ISGID|S_ISUID); 2133 } 2134 2135 /* we have to open the dfile BEFORE setuid */ 2136 if (e->e_dfp == NULL && e->e_df != NULL) 2137 { 2138 e->e_dfp = fopen(e->e_df, "r"); 2139 if (e->e_dfp == NULL) 2140 { 2141 syserr("mailfile: Cannot open %s for %s from %s", 2142 e->e_df, e->e_to, e->e_from.q_paddr); 2143 } 2144 } 2145 2146 if (!bitset(S_ISGID, mode) || setgid(stb.st_gid) < 0) 2147 { 2148 if (ctladdr == NULL || ctladdr->q_uid == 0) 2149 { 2150 (void) initgroups(DefUser, DefGid); 2151 } 2152 else 2153 { 2154 (void) initgroups(ctladdr->q_ruser ? 2155 ctladdr->q_ruser : ctladdr->q_user, 2156 ctladdr->q_gid); 2157 } 2158 } 2159 if (!bitset(S_ISUID, mode) || setuid(stb.st_uid) < 0) 2160 { 2161 if (ctladdr == NULL || ctladdr->q_uid == 0) 2162 (void) setuid(DefUid); 2163 else 2164 (void) setuid(ctladdr->q_uid); 2165 } 2166 FileName = filename; 2167 LineNumber = 0; 2168 f = dfopen(filename, O_WRONLY|O_CREAT|O_APPEND, FileMode); 2169 if (f == NULL) 2170 { 2171 message("554 cannot open: %s", errstring(errno)); 2172 exit(EX_CANTCREAT); 2173 } 2174 2175 putfromline(f, FileMailer, e); 2176 (*e->e_puthdr)(f, FileMailer, e); 2177 putline("\n", f, FileMailer); 2178 (*e->e_putbody)(f, FileMailer, e, NULL); 2179 putline("\n", f, FileMailer); 2180 if (ferror(f)) 2181 { 2182 message("451 I/O error: %s", errstring(errno)); 2183 setstat(EX_IOERR); 2184 } 2185 (void) xfclose(f, "mailfile", filename); 2186 (void) fflush(stdout); 2187 2188 /* reset ISUID & ISGID bits for paranoid systems */ 2189 (void) chmod(filename, (int) stb.st_mode); 2190 exit(ExitStat); 2191 /*NOTREACHED*/ 2192 } 2193 else 2194 { 2195 /* parent -- wait for exit status */ 2196 int st; 2197 2198 st = waitfor(pid); 2199 if (WIFEXITED(st)) 2200 return (WEXITSTATUS(st)); 2201 else 2202 { 2203 syserr("child died on signal %d", st); 2204 return (EX_UNAVAILABLE); 2205 } 2206 /*NOTREACHED*/ 2207 } 2208 } 2209 /* 2210 ** HOSTSIGNATURE -- return the "signature" for a host. 2211 ** 2212 ** The signature describes how we are going to send this -- it 2213 ** can be just the hostname (for non-Internet hosts) or can be 2214 ** an ordered list of MX hosts. 2215 ** 2216 ** Parameters: 2217 ** m -- the mailer describing this host. 2218 ** host -- the host name. 2219 ** e -- the current envelope. 2220 ** 2221 ** Returns: 2222 ** The signature for this host. 2223 ** 2224 ** Side Effects: 2225 ** Can tweak the symbol table. 2226 */ 2227 2228 char * 2229 hostsignature(m, host, e) 2230 register MAILER *m; 2231 char *host; 2232 ENVELOPE *e; 2233 { 2234 register char *p; 2235 register STAB *s; 2236 int i; 2237 int len; 2238 #ifdef NAMED_BIND 2239 int nmx; 2240 auto int rcode; 2241 char *hp; 2242 char *endp; 2243 int oldoptions; 2244 char *mxhosts[MAXMXHOSTS + 1]; 2245 #endif 2246 2247 /* 2248 ** Check to see if this uses IPC -- if not, it can't have MX records. 2249 */ 2250 2251 p = m->m_mailer; 2252 if (strcmp(p, "[IPC]") != 0 && strcmp(p, "[TCP]") != 0) 2253 { 2254 /* just an ordinary mailer */ 2255 return host; 2256 } 2257 2258 /* 2259 ** Look it up in the symbol table. 2260 */ 2261 2262 s = stab(host, ST_HOSTSIG, ST_ENTER); 2263 if (s->s_hostsig != NULL) 2264 return s->s_hostsig; 2265 2266 /* 2267 ** Not already there -- create a signature. 2268 */ 2269 2270 #ifdef NAMED_BIND 2271 if (ConfigLevel < 2) 2272 { 2273 oldoptions = _res.options; 2274 _res.options &= ~(RES_DEFNAMES | RES_DNSRCH); /* XXX */ 2275 } 2276 2277 for (hp = host; hp != NULL; hp = endp) 2278 { 2279 endp = strchr(hp, ':'); 2280 if (endp != NULL) 2281 *endp = '\0'; 2282 2283 nmx = getmxrr(hp, mxhosts, TRUE, &rcode); 2284 2285 if (nmx <= 0) 2286 { 2287 register MCI *mci; 2288 2289 /* update the connection info for this host */ 2290 mci = mci_get(hp, m); 2291 mci->mci_exitstat = rcode; 2292 mci->mci_errno = errno; 2293 #ifdef NAMED_BIND 2294 mci->mci_herrno = h_errno; 2295 #endif 2296 2297 /* and return the original host name as the signature */ 2298 nmx = 1; 2299 mxhosts[0] = hp; 2300 } 2301 2302 len = 0; 2303 for (i = 0; i < nmx; i++) 2304 { 2305 len += strlen(mxhosts[i]) + 1; 2306 } 2307 if (s->s_hostsig != NULL) 2308 len += strlen(s->s_hostsig) + 1; 2309 p = xalloc(len); 2310 if (s->s_hostsig != NULL) 2311 { 2312 (void) strcpy(p, s->s_hostsig); 2313 free(s->s_hostsig); 2314 s->s_hostsig = p; 2315 p += strlen(p); 2316 *p++ = ':'; 2317 } 2318 else 2319 s->s_hostsig = p; 2320 for (i = 0; i < nmx; i++) 2321 { 2322 if (i != 0) 2323 *p++ = ':'; 2324 strcpy(p, mxhosts[i]); 2325 p += strlen(p); 2326 } 2327 if (endp != NULL) 2328 *endp++ = ':'; 2329 } 2330 makelower(s->s_hostsig); 2331 if (ConfigLevel < 2) 2332 _res.options = oldoptions; 2333 #else 2334 /* not using BIND -- the signature is just the host name */ 2335 s->s_hostsig = host; 2336 #endif 2337 if (tTd(17, 1)) 2338 printf("hostsignature(%s) = %s\n", host, s->s_hostsig); 2339 return s->s_hostsig; 2340 } 2341