1 /* 2 * Copyright (c) 1983, 1995 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 #include <errno.h> 10 #include "sendmail.h" 11 12 #ifndef lint 13 #ifdef DAEMON 14 static char sccsid[] = "@(#)daemon.c 8.104 (Berkeley) 06/20/95 (with daemon mode)"; 15 #else 16 static char sccsid[] = "@(#)daemon.c 8.104 (Berkeley) 06/20/95 (without daemon mode)"; 17 #endif 18 #endif /* not lint */ 19 20 #ifdef DAEMON 21 22 # include <arpa/inet.h> 23 24 #if NAMED_BIND 25 # include <resolv.h> 26 #endif 27 28 #if IP_SRCROUTE 29 # include <netinet/in_systm.h> 30 # include <netinet/ip.h> 31 # include <netinet/ip_var.h> 32 #endif 33 34 /* 35 ** DAEMON.C -- routines to use when running as a daemon. 36 ** 37 ** This entire file is highly dependent on the 4.2 BSD 38 ** interprocess communication primitives. No attempt has 39 ** been made to make this file portable to Version 7, 40 ** Version 6, MPX files, etc. If you should try such a 41 ** thing yourself, I recommend chucking the entire file 42 ** and starting from scratch. Basic semantics are: 43 ** 44 ** getrequests() 45 ** Opens a port and initiates a connection. 46 ** Returns in a child. Must set InChannel and 47 ** OutChannel appropriately. 48 ** clrdaemon() 49 ** Close any open files associated with getting 50 ** the connection; this is used when running the queue, 51 ** etc., to avoid having extra file descriptors during 52 ** the queue run and to avoid confusing the network 53 ** code (if it cares). 54 ** makeconnection(host, port, outfile, infile, usesecureport) 55 ** Make a connection to the named host on the given 56 ** port. Set *outfile and *infile to the files 57 ** appropriate for communication. Returns zero on 58 ** success, else an exit status describing the 59 ** error. 60 ** host_map_lookup(map, hbuf, avp, pstat) 61 ** Convert the entry in hbuf into a canonical form. 62 */ 63 /* 64 ** GETREQUESTS -- open mail IPC port and get requests. 65 ** 66 ** Parameters: 67 ** none. 68 ** 69 ** Returns: 70 ** none. 71 ** 72 ** Side Effects: 73 ** Waits until some interesting activity occurs. When 74 ** it does, a child is created to process it, and the 75 ** parent waits for completion. Return from this 76 ** routine is always in the child. The file pointers 77 ** "InChannel" and "OutChannel" should be set to point 78 ** to the communication channel. 79 */ 80 81 int DaemonSocket = -1; /* fd describing socket */ 82 SOCKADDR DaemonAddr; /* socket for incoming */ 83 int ListenQueueSize = 10; /* size of listen queue */ 84 int TcpRcvBufferSize = 0; /* size of TCP receive buffer */ 85 int TcpSndBufferSize = 0; /* size of TCP send buffer */ 86 87 void 88 getrequests() 89 { 90 int t; 91 bool refusingconnections = TRUE; 92 FILE *pidf; 93 int socksize; 94 #if XDEBUG 95 bool j_has_dot; 96 #endif 97 extern void reapchild(); 98 99 /* 100 ** Set up the address for the mailer. 101 */ 102 103 if (DaemonAddr.sin.sin_family == 0) 104 DaemonAddr.sin.sin_family = AF_INET; 105 if (DaemonAddr.sin.sin_addr.s_addr == 0) 106 DaemonAddr.sin.sin_addr.s_addr = INADDR_ANY; 107 if (DaemonAddr.sin.sin_port == 0) 108 { 109 register struct servent *sp; 110 111 sp = getservbyname("smtp", "tcp"); 112 if (sp == NULL) 113 { 114 syserr("554 service \"smtp\" unknown"); 115 DaemonAddr.sin.sin_port = htons(25); 116 } 117 else 118 DaemonAddr.sin.sin_port = sp->s_port; 119 } 120 121 /* 122 ** Try to actually open the connection. 123 */ 124 125 if (tTd(15, 1)) 126 printf("getrequests: port 0x%x\n", DaemonAddr.sin.sin_port); 127 128 /* get a socket for the SMTP connection */ 129 socksize = opendaemonsocket(TRUE); 130 131 (void) setsignal(SIGCHLD, reapchild); 132 133 /* write the pid to the log file for posterity */ 134 pidf = fopen(PidFile, "w"); 135 if (pidf != NULL) 136 { 137 extern char *CommandLineArgs; 138 139 /* write the process id on line 1 */ 140 fprintf(pidf, "%d\n", getpid()); 141 142 /* line 2 contains all command line flags */ 143 fprintf(pidf, "%s\n", CommandLineArgs); 144 145 /* flush and close */ 146 fclose(pidf); 147 } 148 149 #if XDEBUG 150 { 151 char jbuf[MAXHOSTNAMELEN]; 152 153 expand("\201j", jbuf, sizeof jbuf, CurEnv); 154 j_has_dot = strchr(jbuf, '.') != NULL; 155 } 156 #endif 157 158 if (tTd(15, 1)) 159 printf("getrequests: %d\n", DaemonSocket); 160 161 for (;;) 162 { 163 register int pid; 164 auto int lotherend; 165 extern bool refuseconnections(); 166 extern int getla(); 167 168 /* see if we are rejecting connections */ 169 CurrentLA = getla(); 170 if (refuseconnections()) 171 { 172 if (DaemonSocket >= 0) 173 { 174 /* close socket so peer will fail quickly */ 175 (void) close(DaemonSocket); 176 DaemonSocket = -1; 177 } 178 refusingconnections = TRUE; 179 sleep(15); 180 continue; 181 } 182 183 /* arrange to (re)open the socket if necessary */ 184 if (refusingconnections) 185 { 186 (void) opendaemonsocket(FALSE); 187 refusingconnections = FALSE; 188 } 189 190 #if XDEBUG 191 /* check for disaster */ 192 { 193 char jbuf[MAXHOSTNAMELEN]; 194 195 expand("\201j", jbuf, sizeof jbuf, CurEnv); 196 if (!wordinclass(jbuf, 'w')) 197 { 198 dumpstate("daemon lost $j"); 199 syslog(LOG_ALERT, "daemon process doesn't have $j in $=w; see syslog"); 200 abort(); 201 } 202 else if (j_has_dot && strchr(jbuf, '.') == NULL) 203 { 204 dumpstate("daemon $j lost dot"); 205 syslog(LOG_ALERT, "daemon process $j lost dot; see syslog"); 206 abort(); 207 } 208 } 209 #endif 210 211 /* wait for a connection */ 212 setproctitle("accepting connections"); 213 do 214 { 215 errno = 0; 216 lotherend = socksize; 217 t = accept(DaemonSocket, 218 (struct sockaddr *)&RealHostAddr, &lotherend); 219 } while (t < 0 && errno == EINTR); 220 if (t < 0) 221 { 222 syserr("getrequests: accept"); 223 224 /* arrange to re-open the socket next time around */ 225 (void) close(DaemonSocket); 226 DaemonSocket = -1; 227 sleep(5); 228 continue; 229 } 230 231 /* 232 ** Create a subprocess to process the mail. 233 */ 234 235 if (tTd(15, 2)) 236 printf("getrequests: forking (fd = %d)\n", t); 237 238 pid = fork(); 239 if (pid < 0) 240 { 241 syserr("daemon: cannot fork"); 242 sleep(10); 243 (void) close(t); 244 continue; 245 } 246 247 if (pid == 0) 248 { 249 char *p; 250 extern char *hostnamebyanyaddr(); 251 extern void intsig(); 252 253 /* 254 ** CHILD -- return to caller. 255 ** Collect verified idea of sending host. 256 ** Verify calling user id if possible here. 257 */ 258 259 (void) setsignal(SIGCHLD, SIG_DFL); 260 (void) setsignal(SIGHUP, intsig); 261 (void) close(DaemonSocket); 262 DisConnected = FALSE; 263 264 setproctitle("startup with %s", 265 anynet_ntoa(&RealHostAddr)); 266 267 /* determine host name */ 268 p = hostnamebyanyaddr(&RealHostAddr); 269 if (strlen(p) > MAXNAME) 270 p[MAXNAME] = '\0'; 271 RealHostName = newstr(p); 272 setproctitle("startup with %s", p); 273 274 if ((InChannel = fdopen(t, "r")) == NULL || 275 (t = dup(t)) < 0 || 276 (OutChannel = fdopen(t, "w")) == NULL) 277 { 278 syserr("cannot open SMTP server channel, fd=%d", t); 279 exit(0); 280 } 281 282 /* should we check for illegal connection here? XXX */ 283 #ifdef XLA 284 if (!xla_host_ok(RealHostName)) 285 { 286 message("421 Too many SMTP sessions for this host"); 287 exit(0); 288 } 289 #endif 290 291 if (tTd(15, 2)) 292 printf("getreq: returning\n"); 293 return; 294 } 295 296 CurChildren++; 297 298 /* close the port so that others will hang (for a while) */ 299 (void) close(t); 300 } 301 /*NOTREACHED*/ 302 } 303 /* 304 ** OPENDAEMONSOCKET -- open the SMTP socket 305 ** 306 ** Deals with setting all appropriate options. DaemonAddr must 307 ** be set up in advance. 308 ** 309 ** Parameters: 310 ** firsttime -- set if this is the initial open. 311 ** 312 ** Returns: 313 ** Size in bytes of the daemon socket addr. 314 ** 315 ** Side Effects: 316 ** Leaves DaemonSocket set to the open socket. 317 ** Exits if the socket cannot be created. 318 */ 319 320 #define MAXOPENTRIES 10 /* maximum number of tries to open connection */ 321 322 int 323 opendaemonsocket(firsttime) 324 bool firsttime; 325 { 326 int on = 1; 327 int socksize = 0; 328 int ntries = 0; 329 int saveerrno; 330 331 if (tTd(15, 2)) 332 printf("opendaemonsocket()\n"); 333 334 do 335 { 336 if (ntries > 0) 337 sleep(5); 338 if (firsttime || DaemonSocket < 0) 339 { 340 DaemonSocket = socket(DaemonAddr.sa.sa_family, SOCK_STREAM, 0); 341 if (DaemonSocket < 0) 342 { 343 /* probably another daemon already */ 344 saveerrno = errno; 345 syserr("opendaemonsocket: can't create server SMTP socket"); 346 severe: 347 # ifdef LOG 348 if (LogLevel > 0) 349 syslog(LOG_ALERT, "problem creating SMTP socket"); 350 # endif /* LOG */ 351 DaemonSocket = -1; 352 continue; 353 } 354 355 /* turn on network debugging? */ 356 if (tTd(15, 101)) 357 (void) setsockopt(DaemonSocket, SOL_SOCKET, 358 SO_DEBUG, (char *)&on, 359 sizeof on); 360 361 (void) setsockopt(DaemonSocket, SOL_SOCKET, 362 SO_REUSEADDR, (char *)&on, sizeof on); 363 (void) setsockopt(DaemonSocket, SOL_SOCKET, 364 SO_KEEPALIVE, (char *)&on, sizeof on); 365 366 #ifdef SO_RCVBUF 367 if (TcpRcvBufferSize > 0) 368 { 369 if (setsockopt(DaemonSocket, SOL_SOCKET, 370 SO_RCVBUF, 371 (char *) &TcpRcvBufferSize, 372 sizeof(TcpRcvBufferSize)) < 0) 373 syserr("getrequests: setsockopt(SO_RCVBUF)"); 374 } 375 #endif 376 377 switch (DaemonAddr.sa.sa_family) 378 { 379 # if NETINET 380 case AF_INET: 381 socksize = sizeof DaemonAddr.sin; 382 break; 383 # endif 384 385 # if NETISO 386 case AF_ISO: 387 socksize = sizeof DaemonAddr.siso; 388 break; 389 # endif 390 391 default: 392 socksize = sizeof DaemonAddr; 393 break; 394 } 395 396 if (bind(DaemonSocket, &DaemonAddr.sa, socksize) < 0) 397 { 398 saveerrno = errno; 399 syserr("getrequests: cannot bind"); 400 (void) close(DaemonSocket); 401 goto severe; 402 } 403 } 404 if (!firsttime && listen(DaemonSocket, ListenQueueSize) < 0) 405 { 406 saveerrno = errno; 407 syserr("getrequests: cannot listen"); 408 (void) close(DaemonSocket); 409 goto severe; 410 } 411 return socksize; 412 } while (ntries++ < MAXOPENTRIES && transienterror(saveerrno)); 413 syserr("!opendaemonsocket: server SMTP socket wedged: exiting"); 414 finis(); 415 } 416 /* 417 ** CLRDAEMON -- reset the daemon connection 418 ** 419 ** Parameters: 420 ** none. 421 ** 422 ** Returns: 423 ** none. 424 ** 425 ** Side Effects: 426 ** releases any resources used by the passive daemon. 427 */ 428 429 void 430 clrdaemon() 431 { 432 if (DaemonSocket >= 0) 433 (void) close(DaemonSocket); 434 DaemonSocket = -1; 435 } 436 /* 437 ** SETDAEMONOPTIONS -- set options for running the daemon 438 ** 439 ** Parameters: 440 ** p -- the options line. 441 ** 442 ** Returns: 443 ** none. 444 */ 445 446 void 447 setdaemonoptions(p) 448 register char *p; 449 { 450 if (DaemonAddr.sa.sa_family == AF_UNSPEC) 451 DaemonAddr.sa.sa_family = AF_INET; 452 453 while (p != NULL) 454 { 455 register char *f; 456 register char *v; 457 458 while (isascii(*p) && isspace(*p)) 459 p++; 460 if (*p == '\0') 461 break; 462 f = p; 463 p = strchr(p, ','); 464 if (p != NULL) 465 *p++ = '\0'; 466 v = strchr(f, '='); 467 if (v == NULL) 468 continue; 469 while (isascii(*++v) && isspace(*v)) 470 continue; 471 if (isascii(*f) && isupper(*f)) 472 *f = tolower(*f); 473 474 switch (*f) 475 { 476 case 'F': /* address family */ 477 if (isascii(*v) && isdigit(*v)) 478 DaemonAddr.sa.sa_family = atoi(v); 479 #if NETINET 480 else if (strcasecmp(v, "inet") == 0) 481 DaemonAddr.sa.sa_family = AF_INET; 482 #endif 483 #if NETISO 484 else if (strcasecmp(v, "iso") == 0) 485 DaemonAddr.sa.sa_family = AF_ISO; 486 #endif 487 #if NETNS 488 else if (strcasecmp(v, "ns") == 0) 489 DaemonAddr.sa.sa_family = AF_NS; 490 #endif 491 #if NETX25 492 else if (strcasecmp(v, "x.25") == 0) 493 DaemonAddr.sa.sa_family = AF_CCITT; 494 #endif 495 else 496 syserr("554 Unknown address family %s in Family=option", v); 497 break; 498 499 case 'A': /* address */ 500 switch (DaemonAddr.sa.sa_family) 501 { 502 #if NETINET 503 case AF_INET: 504 if (isascii(*v) && isdigit(*v)) 505 DaemonAddr.sin.sin_addr.s_addr = htonl(inet_network(v)); 506 else 507 { 508 register struct netent *np; 509 510 np = getnetbyname(v); 511 if (np == NULL) 512 syserr("554 network \"%s\" unknown", v); 513 else 514 DaemonAddr.sin.sin_addr.s_addr = np->n_net; 515 } 516 break; 517 #endif 518 519 default: 520 syserr("554 Address= option unsupported for family %d", 521 DaemonAddr.sa.sa_family); 522 break; 523 } 524 break; 525 526 case 'P': /* port */ 527 switch (DaemonAddr.sa.sa_family) 528 { 529 short port; 530 531 #if NETINET 532 case AF_INET: 533 if (isascii(*v) && isdigit(*v)) 534 DaemonAddr.sin.sin_port = htons(atoi(v)); 535 else 536 { 537 register struct servent *sp; 538 539 sp = getservbyname(v, "tcp"); 540 if (sp == NULL) 541 syserr("554 service \"%s\" unknown", v); 542 else 543 DaemonAddr.sin.sin_port = sp->s_port; 544 } 545 break; 546 #endif 547 548 #if NETISO 549 case AF_ISO: 550 /* assume two byte transport selector */ 551 if (isascii(*v) && isdigit(*v)) 552 port = htons(atoi(v)); 553 else 554 { 555 register struct servent *sp; 556 557 sp = getservbyname(v, "tcp"); 558 if (sp == NULL) 559 syserr("554 service \"%s\" unknown", v); 560 else 561 port = sp->s_port; 562 } 563 bcopy((char *) &port, TSEL(&DaemonAddr.siso), 2); 564 break; 565 #endif 566 567 default: 568 syserr("554 Port= option unsupported for family %d", 569 DaemonAddr.sa.sa_family); 570 break; 571 } 572 break; 573 574 case 'L': /* listen queue size */ 575 ListenQueueSize = atoi(v); 576 break; 577 578 case 'S': /* send buffer size */ 579 TcpSndBufferSize = atoi(v); 580 break; 581 582 case 'R': /* receive buffer size */ 583 TcpRcvBufferSize = atoi(v); 584 break; 585 586 default: 587 syserr("554 DaemonPortOptions parameter \"%s\" unknown", f); 588 } 589 } 590 } 591 /* 592 ** MAKECONNECTION -- make a connection to an SMTP socket on another machine. 593 ** 594 ** Parameters: 595 ** host -- the name of the host. 596 ** port -- the port number to connect to. 597 ** mci -- a pointer to the mail connection information 598 ** structure to be filled in. 599 ** usesecureport -- if set, use a low numbered (reserved) 600 ** port to provide some rudimentary authentication. 601 ** 602 ** Returns: 603 ** An exit code telling whether the connection could be 604 ** made and if not why not. 605 ** 606 ** Side Effects: 607 ** none. 608 */ 609 610 SOCKADDR CurHostAddr; /* address of current host */ 611 612 int 613 makeconnection(host, port, mci, usesecureport) 614 char *host; 615 u_short port; 616 register MCI *mci; 617 bool usesecureport; 618 { 619 register int i = 0; 620 register int s; 621 register struct hostent *hp = (struct hostent *)NULL; 622 SOCKADDR addr; 623 int sav_errno; 624 int addrlen; 625 bool firstconnect; 626 #if NAMED_BIND 627 extern int h_errno; 628 #endif 629 630 /* 631 ** Set up the address for the mailer. 632 ** Accept "[a.b.c.d]" syntax for host name. 633 */ 634 635 #if NAMED_BIND 636 h_errno = 0; 637 #endif 638 errno = 0; 639 bzero(&CurHostAddr, sizeof CurHostAddr); 640 SmtpPhase = mci->mci_phase = "initial connection"; 641 CurHostName = host; 642 643 if (host[0] == '[') 644 { 645 long hid; 646 register char *p = strchr(host, ']'); 647 648 if (p != NULL) 649 { 650 *p = '\0'; 651 #if NETINET 652 hid = inet_addr(&host[1]); 653 if (hid == -1) 654 #endif 655 { 656 /* try it as a host name (avoid MX lookup) */ 657 hp = sm_gethostbyname(&host[1]); 658 if (hp == NULL && p[-1] == '.') 659 { 660 #if NAMED_BIND 661 int oldopts = _res.options; 662 663 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); 664 #endif 665 p[-1] = '\0'; 666 hp = sm_gethostbyname(&host[1]); 667 p[-1] = '.'; 668 #if NAMED_BIND 669 _res.options = oldopts; 670 #endif 671 } 672 *p = ']'; 673 goto gothostent; 674 } 675 *p = ']'; 676 } 677 if (p == NULL) 678 { 679 usrerr("553 Invalid numeric domain spec \"%s\"", host); 680 mci->mci_status = "5.1.2"; 681 return (EX_NOHOST); 682 } 683 #if NETINET 684 addr.sin.sin_family = AF_INET; /*XXX*/ 685 addr.sin.sin_addr.s_addr = hid; 686 #endif 687 } 688 else 689 { 690 register char *p = &host[strlen(host) - 1]; 691 692 hp = sm_gethostbyname(host); 693 if (hp == NULL && *p == '.') 694 { 695 #if NAMED_BIND 696 int oldopts = _res.options; 697 698 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); 699 #endif 700 *p = '\0'; 701 hp = sm_gethostbyname(host); 702 *p = '.'; 703 #if NAMED_BIND 704 _res.options = oldopts; 705 #endif 706 } 707 gothostent: 708 if (hp == NULL) 709 { 710 #if NAMED_BIND 711 /* check for name server timeouts */ 712 if (errno == ETIMEDOUT || h_errno == TRY_AGAIN || 713 (errno == ECONNREFUSED && UseNameServer)) 714 { 715 mci->mci_status = "4.4.3"; 716 return (EX_TEMPFAIL); 717 } 718 #endif 719 return (EX_NOHOST); 720 } 721 addr.sa.sa_family = hp->h_addrtype; 722 switch (hp->h_addrtype) 723 { 724 #if NETINET 725 case AF_INET: 726 bcopy(hp->h_addr, 727 &addr.sin.sin_addr, 728 INADDRSZ); 729 break; 730 #endif 731 732 default: 733 bcopy(hp->h_addr, 734 addr.sa.sa_data, 735 hp->h_length); 736 break; 737 } 738 i = 1; 739 } 740 741 /* 742 ** Determine the port number. 743 */ 744 745 if (port == 0) 746 { 747 register struct servent *sp = getservbyname("smtp", "tcp"); 748 749 if (sp == NULL) 750 { 751 #ifdef LOG 752 if (LogLevel > 2) 753 syslog(LOG_ERR, "makeconnection: service \"smtp\" unknown"); 754 #endif 755 port = htons(25); 756 } 757 else 758 port = sp->s_port; 759 } 760 761 switch (addr.sa.sa_family) 762 { 763 #if NETINET 764 case AF_INET: 765 addr.sin.sin_port = port; 766 addrlen = sizeof (struct sockaddr_in); 767 break; 768 #endif 769 770 #if NETISO 771 case AF_ISO: 772 /* assume two byte transport selector */ 773 bcopy((char *) &port, TSEL((struct sockaddr_iso *) &addr), 2); 774 addrlen = sizeof (struct sockaddr_iso); 775 break; 776 #endif 777 778 default: 779 syserr("Can't connect to address family %d", addr.sa.sa_family); 780 return (EX_NOHOST); 781 } 782 783 /* 784 ** Try to actually open the connection. 785 */ 786 787 #ifdef XLA 788 /* if too many connections, don't bother trying */ 789 if (!xla_noqueue_ok(host)) 790 return EX_TEMPFAIL; 791 #endif 792 793 firstconnect = TRUE; 794 for (;;) 795 { 796 if (tTd(16, 1)) 797 printf("makeconnection (%s [%s])\n", 798 host, anynet_ntoa(&addr)); 799 800 /* save for logging */ 801 CurHostAddr = addr; 802 803 if (usesecureport) 804 { 805 int rport = IPPORT_RESERVED - 1; 806 807 s = rresvport(&rport); 808 } 809 else 810 { 811 s = socket(AF_INET, SOCK_STREAM, 0); 812 } 813 if (s < 0) 814 { 815 sav_errno = errno; 816 syserr("makeconnection: cannot create socket"); 817 goto failure; 818 } 819 820 #ifdef SO_SNDBUF 821 if (TcpSndBufferSize > 0) 822 { 823 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, 824 (char *) &TcpSndBufferSize, 825 sizeof(TcpSndBufferSize)) < 0) 826 syserr("makeconnection: setsockopt(SO_SNDBUF)"); 827 } 828 #endif 829 830 if (tTd(16, 1)) 831 printf("makeconnection: fd=%d\n", s); 832 833 /* turn on network debugging? */ 834 if (tTd(16, 101)) 835 { 836 int on = 1; 837 (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, 838 (char *)&on, sizeof on); 839 } 840 if (CurEnv->e_xfp != NULL) 841 (void) fflush(CurEnv->e_xfp); /* for debugging */ 842 errno = 0; /* for debugging */ 843 if (connect(s, (struct sockaddr *) &addr, addrlen) >= 0) 844 break; 845 846 /* if running demand-dialed connection, try again */ 847 if (DialDelay > 0 && firstconnect) 848 { 849 if (tTd(16, 1)) 850 printf("Connect failed (%s); trying again...\n", 851 errstring(sav_errno)); 852 firstconnect = FALSE; 853 sleep(DialDelay); 854 continue; 855 } 856 857 /* couldn't connect.... figure out why */ 858 sav_errno = errno; 859 (void) close(s); 860 if (hp != NULL && hp->h_addr_list[i]) 861 { 862 if (tTd(16, 1)) 863 printf("Connect failed (%s); trying new address....\n", 864 errstring(sav_errno)); 865 switch (addr.sa.sa_family) 866 { 867 #if NETINET 868 case AF_INET: 869 bcopy(hp->h_addr_list[i++], 870 &addr.sin.sin_addr, 871 INADDRSZ); 872 break; 873 #endif 874 875 default: 876 bcopy(hp->h_addr_list[i++], 877 addr.sa.sa_data, 878 hp->h_length); 879 break; 880 } 881 continue; 882 } 883 884 /* failure, decide if temporary or not */ 885 failure: 886 #ifdef XLA 887 xla_host_end(host); 888 #endif 889 if (transienterror(sav_errno)) 890 return EX_TEMPFAIL; 891 else 892 { 893 message("%s", errstring(sav_errno)); 894 return (EX_UNAVAILABLE); 895 } 896 } 897 898 /* connection ok, put it into canonical form */ 899 if ((mci->mci_out = fdopen(s, "w")) == NULL || 900 (s = dup(s)) < 0 || 901 (mci->mci_in = fdopen(s, "r")) == NULL) 902 { 903 syserr("cannot open SMTP client channel, fd=%d", s); 904 return EX_TEMPFAIL; 905 } 906 907 return (EX_OK); 908 } 909 /* 910 ** MYHOSTNAME -- return the name of this host. 911 ** 912 ** Parameters: 913 ** hostbuf -- a place to return the name of this host. 914 ** size -- the size of hostbuf. 915 ** 916 ** Returns: 917 ** A list of aliases for this host. 918 ** 919 ** Side Effects: 920 ** Adds numeric codes to $=w. 921 */ 922 923 struct hostent * 924 myhostname(hostbuf, size) 925 char hostbuf[]; 926 int size; 927 { 928 register struct hostent *hp; 929 extern bool getcanonname(); 930 extern int h_errno; 931 932 if (gethostname(hostbuf, size) < 0) 933 { 934 (void) strcpy(hostbuf, "localhost"); 935 } 936 hp = sm_gethostbyname(hostbuf); 937 if (hp == NULL) 938 return NULL; 939 if (strchr(hp->h_name, '.') != NULL || strchr(hostbuf, '.') == NULL) 940 { 941 (void) strncpy(hostbuf, hp->h_name, size - 1); 942 hostbuf[size - 1] = '\0'; 943 } 944 945 /* 946 ** If there is still no dot in the name, try looking for a 947 ** dotted alias. 948 */ 949 950 if (strchr(hostbuf, '.') == NULL) 951 { 952 char **ha; 953 954 for (ha = hp->h_aliases; *ha != NULL; ha++) 955 { 956 if (strchr(*ha, '.') != NULL) 957 { 958 (void) strncpy(hostbuf, *ha, size - 1); 959 hostbuf[size - 1] = '\0'; 960 break; 961 } 962 } 963 } 964 965 /* 966 ** If _still_ no dot, wait for a while and try again -- it is 967 ** possible that some service is starting up. This can result 968 ** in excessive delays if the system is badly configured, but 969 ** there really isn't a way around that, particularly given that 970 ** the config file hasn't been read at this point. 971 ** All in all, a bit of a mess. 972 */ 973 974 if (strchr(hostbuf, '.') == NULL && 975 !getcanonname(hostbuf, size, TRUE)) 976 { 977 message("My unqualifed host name (%s) unknown; sleeping for retry", 978 hostbuf); 979 sleep(60); 980 (void) getcanonname(hostbuf, size, TRUE); 981 } 982 return (hp); 983 } 984 /* 985 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 986 ** 987 ** Uses RFC1413 protocol to try to get info from the other end. 988 ** 989 ** Parameters: 990 ** fd -- the descriptor 991 ** 992 ** Returns: 993 ** The user@host information associated with this descriptor. 994 */ 995 996 static jmp_buf CtxAuthTimeout; 997 998 static void 999 authtimeout() 1000 { 1001 longjmp(CtxAuthTimeout, 1); 1002 } 1003 1004 char * 1005 getauthinfo(fd) 1006 int fd; 1007 { 1008 int falen; 1009 register char *p; 1010 SOCKADDR la; 1011 int lalen; 1012 register struct servent *sp; 1013 int s; 1014 int i; 1015 EVENT *ev; 1016 int nleft; 1017 char ibuf[MAXNAME + 1]; 1018 static char hbuf[MAXNAME * 2 + 2]; 1019 extern char *hostnamebyanyaddr(); 1020 1021 falen = sizeof RealHostAddr; 1022 if (isatty(fd) || getpeername(fd, &RealHostAddr.sa, &falen) < 0 || 1023 falen <= 0 || RealHostAddr.sa.sa_family == 0) 1024 { 1025 (void) sprintf(hbuf, "%s@localhost", RealUserName); 1026 if (tTd(9, 1)) 1027 printf("getauthinfo: %s\n", hbuf); 1028 return hbuf; 1029 } 1030 1031 if (RealHostName == NULL) 1032 { 1033 /* translate that to a host name */ 1034 RealHostName = newstr(hostnamebyanyaddr(&RealHostAddr)); 1035 } 1036 1037 if (TimeOuts.to_ident == 0) 1038 goto noident; 1039 1040 lalen = sizeof la; 1041 if (RealHostAddr.sa.sa_family != AF_INET || 1042 getsockname(fd, &la.sa, &lalen) < 0 || lalen <= 0 || 1043 la.sa.sa_family != AF_INET) 1044 { 1045 /* no ident info */ 1046 goto noident; 1047 } 1048 1049 /* create ident query */ 1050 (void) sprintf(ibuf, "%d,%d\r\n", 1051 ntohs(RealHostAddr.sin.sin_port), ntohs(la.sin.sin_port)); 1052 1053 /* create local address */ 1054 la.sin.sin_port = 0; 1055 1056 /* create foreign address */ 1057 sp = getservbyname("auth", "tcp"); 1058 if (sp != NULL) 1059 RealHostAddr.sin.sin_port = sp->s_port; 1060 else 1061 RealHostAddr.sin.sin_port = htons(113); 1062 1063 s = -1; 1064 if (setjmp(CtxAuthTimeout) != 0) 1065 { 1066 if (s >= 0) 1067 (void) close(s); 1068 goto noident; 1069 } 1070 1071 /* put a timeout around the whole thing */ 1072 ev = setevent(TimeOuts.to_ident, authtimeout, 0); 1073 1074 /* connect to foreign IDENT server using same address as SMTP socket */ 1075 s = socket(AF_INET, SOCK_STREAM, 0); 1076 if (s < 0) 1077 { 1078 clrevent(ev); 1079 goto noident; 1080 } 1081 if (bind(s, &la.sa, sizeof la.sin) < 0 || 1082 connect(s, &RealHostAddr.sa, sizeof RealHostAddr.sin) < 0) 1083 { 1084 goto closeident; 1085 } 1086 1087 if (tTd(9, 10)) 1088 printf("getauthinfo: sent %s", ibuf); 1089 1090 /* send query */ 1091 if (write(s, ibuf, strlen(ibuf)) < 0) 1092 goto closeident; 1093 1094 /* get result */ 1095 p = &ibuf[0]; 1096 nleft = sizeof ibuf - 1; 1097 while ((i = read(s, p, nleft)) > 0) 1098 { 1099 p += i; 1100 nleft -= i; 1101 } 1102 (void) close(s); 1103 clrevent(ev); 1104 if (i < 0 || p == &ibuf[0]) 1105 goto noident; 1106 1107 if (*--p == '\n' && *--p == '\r') 1108 p--; 1109 *++p = '\0'; 1110 1111 if (tTd(9, 3)) 1112 printf("getauthinfo: got %s\n", ibuf); 1113 1114 /* parse result */ 1115 p = strchr(ibuf, ':'); 1116 if (p == NULL) 1117 { 1118 /* malformed response */ 1119 goto noident; 1120 } 1121 while (isascii(*++p) && isspace(*p)) 1122 continue; 1123 if (strncasecmp(p, "userid", 6) != 0) 1124 { 1125 /* presumably an error string */ 1126 goto noident; 1127 } 1128 p += 6; 1129 while (isascii(*p) && isspace(*p)) 1130 p++; 1131 if (*p++ != ':') 1132 { 1133 /* either useridxx or malformed response */ 1134 goto noident; 1135 } 1136 1137 /* p now points to the OSTYPE field */ 1138 while (isascii(*p) && isspace(*p)) 1139 p++; 1140 if (strncasecmp(p, "other", 5) == 0 && 1141 (p[5] == ':' || p[5] == ' ' || p[5] == ',' || p[5] == '\0')) 1142 { 1143 /* not useful information */ 1144 goto noident; 1145 } 1146 p = strchr(p, ':'); 1147 if (p == NULL) 1148 { 1149 /* malformed response */ 1150 goto noident; 1151 } 1152 1153 /* 1413 says don't do this -- but it's broken otherwise */ 1154 while (isascii(*++p) && isspace(*p)) 1155 continue; 1156 1157 /* p now points to the authenticated name -- copy carefully */ 1158 cleanstrcpy(hbuf, p, MAXNAME); 1159 i = strlen(hbuf); 1160 hbuf[i++] = '@'; 1161 strcpy(&hbuf[i], RealHostName == NULL ? "localhost" : RealHostName); 1162 goto postident; 1163 1164 closeident: 1165 (void) close(s); 1166 clrevent(ev); 1167 1168 noident: 1169 if (RealHostName == NULL) 1170 { 1171 if (tTd(9, 1)) 1172 printf("getauthinfo: NULL\n"); 1173 return NULL; 1174 } 1175 (void) strcpy(hbuf, RealHostName); 1176 1177 postident: 1178 #if IP_SRCROUTE 1179 /* 1180 ** Extract IP source routing information. 1181 ** 1182 ** Format of output for a connection from site a through b 1183 ** through c to d: 1184 ** loose: @site-c@site-b:site-a 1185 ** strict: !@site-c@site-b:site-a 1186 ** 1187 ** o - pointer within ipopt_list structure. 1188 ** q - pointer within ls/ss rr route data 1189 ** p - pointer to hbuf 1190 */ 1191 1192 if (RealHostAddr.sa.sa_family == AF_INET) 1193 { 1194 int ipoptlen, j; 1195 u_char *q; 1196 u_char *o; 1197 struct in_addr addr; 1198 struct ipoption ipopt; 1199 1200 ipoptlen = sizeof ipopt; 1201 if (getsockopt(fd, IPPROTO_IP, IP_OPTIONS, 1202 (char *) &ipopt, &ipoptlen) < 0) 1203 goto noipsr; 1204 if (ipoptlen == 0) 1205 goto noipsr; 1206 o = (u_char *) ipopt.ipopt_list; 1207 while (o != NULL && o < (u_char *) &ipopt + ipoptlen) 1208 { 1209 switch (*o) 1210 { 1211 case IPOPT_EOL: 1212 o = NULL; 1213 break; 1214 1215 case IPOPT_NOP: 1216 o++; 1217 break; 1218 1219 case IPOPT_SSRR: 1220 case IPOPT_LSRR: 1221 p = &hbuf[strlen(hbuf)]; 1222 sprintf(p, " [%s@%s", 1223 *o == IPOPT_SSRR ? "!" : "", 1224 inet_ntoa(ipopt.ipopt_dst)); 1225 p += strlen(p); 1226 1227 /* o[1] is option length */ 1228 j = *++o / sizeof(struct in_addr) - 1; 1229 1230 /* q skips length and router pointer to data */ 1231 q = o + 2; 1232 for ( ; j >= 0; j--) 1233 { 1234 memcpy(&addr, q, sizeof(addr)); 1235 sprintf(p, "%c%s", 1236 j ? '@' : ':', 1237 inet_ntoa(addr)); 1238 p += strlen(p); 1239 q += sizeof(struct in_addr); 1240 } 1241 o += *o; 1242 break; 1243 1244 default: 1245 /* Skip over option */ 1246 o += o[1]; 1247 break; 1248 } 1249 } 1250 strcat(hbuf,"]"); 1251 goto postipsr; 1252 } 1253 #endif 1254 1255 noipsr: 1256 if (RealHostName != NULL && RealHostName[0] != '[') 1257 { 1258 p = &hbuf[strlen(hbuf)]; 1259 (void) sprintf(p, " [%s]", anynet_ntoa(&RealHostAddr)); 1260 } 1261 1262 postipsr: 1263 if (tTd(9, 1)) 1264 printf("getauthinfo: %s\n", hbuf); 1265 return hbuf; 1266 } 1267 /* 1268 ** HOST_MAP_LOOKUP -- turn a hostname into canonical form 1269 ** 1270 ** Parameters: 1271 ** map -- a pointer to this map (unused). 1272 ** name -- the (presumably unqualified) hostname. 1273 ** av -- unused -- for compatibility with other mapping 1274 ** functions. 1275 ** statp -- an exit status (out parameter) -- set to 1276 ** EX_TEMPFAIL if the name server is unavailable. 1277 ** 1278 ** Returns: 1279 ** The mapping, if found. 1280 ** NULL if no mapping found. 1281 ** 1282 ** Side Effects: 1283 ** Looks up the host specified in hbuf. If it is not 1284 ** the canonical name for that host, return the canonical 1285 ** name. 1286 */ 1287 1288 char * 1289 host_map_lookup(map, name, av, statp) 1290 MAP *map; 1291 char *name; 1292 char **av; 1293 int *statp; 1294 { 1295 register struct hostent *hp; 1296 struct in_addr in_addr; 1297 char *cp; 1298 register STAB *s; 1299 char hbuf[MAXNAME + 1]; 1300 #if NAMED_BIND 1301 extern int h_errno; 1302 #endif 1303 1304 /* 1305 ** See if we have already looked up this name. If so, just 1306 ** return it. 1307 */ 1308 1309 s = stab(name, ST_NAMECANON, ST_ENTER); 1310 if (bitset(NCF_VALID, s->s_namecanon.nc_flags)) 1311 { 1312 if (tTd(9, 1)) 1313 printf("host_map_lookup(%s) => CACHE %s\n", 1314 name, 1315 s->s_namecanon.nc_cname == NULL 1316 ? "NULL" 1317 : s->s_namecanon.nc_cname); 1318 errno = s->s_namecanon.nc_errno; 1319 #if NAMED_BIND 1320 h_errno = s->s_namecanon.nc_herrno; 1321 #endif 1322 *statp = s->s_namecanon.nc_stat; 1323 if (*statp == EX_TEMPFAIL) 1324 { 1325 CurEnv->e_status = "4.4.3"; 1326 usrerr("451 %s: Name server timeout", 1327 shortenstring(name, 33)); 1328 } 1329 return s->s_namecanon.nc_cname; 1330 } 1331 1332 /* 1333 ** If first character is a bracket, then it is an address 1334 ** lookup. Address is copied into a temporary buffer to 1335 ** strip the brackets and to preserve name if address is 1336 ** unknown. 1337 */ 1338 1339 if (*name != '[') 1340 { 1341 extern bool getcanonname(); 1342 1343 if (tTd(9, 1)) 1344 printf("host_map_lookup(%s) => ", name); 1345 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1346 if (strlen(name) < sizeof hbuf) 1347 (void) strcpy(hbuf, name); 1348 else 1349 { 1350 bcopy(name, hbuf, sizeof hbuf - 1); 1351 hbuf[sizeof hbuf - 1] = '\0'; 1352 } 1353 if (getcanonname(hbuf, sizeof hbuf - 1, !HasWildcardMX)) 1354 { 1355 if (tTd(9, 1)) 1356 printf("%s\n", hbuf); 1357 cp = map_rewrite(map, hbuf, strlen(hbuf), av); 1358 s->s_namecanon.nc_cname = newstr(cp); 1359 return cp; 1360 } 1361 else 1362 { 1363 register struct hostent *hp; 1364 1365 s->s_namecanon.nc_errno = errno; 1366 #if NAMED_BIND 1367 s->s_namecanon.nc_herrno = h_errno; 1368 if (tTd(9, 1)) 1369 printf("FAIL (%d)\n", h_errno); 1370 switch (h_errno) 1371 { 1372 case TRY_AGAIN: 1373 if (UseNameServer) 1374 { 1375 CurEnv->e_status = "4.4.3"; 1376 usrerr("451 %s: Name server timeout", 1377 shortenstring(name, 33)); 1378 } 1379 *statp = EX_TEMPFAIL; 1380 break; 1381 1382 case HOST_NOT_FOUND: 1383 case NO_DATA: 1384 *statp = EX_NOHOST; 1385 break; 1386 1387 case NO_RECOVERY: 1388 *statp = EX_SOFTWARE; 1389 break; 1390 1391 default: 1392 *statp = EX_UNAVAILABLE; 1393 break; 1394 } 1395 #else 1396 if (tTd(9, 1)) 1397 printf("FAIL\n"); 1398 *statp = EX_NOHOST; 1399 #endif 1400 s->s_namecanon.nc_stat = *statp; 1401 if ((*statp != EX_TEMPFAIL && *statp != EX_NOHOST) || 1402 UseNameServer) 1403 return NULL; 1404 1405 /* 1406 ** Try to look it up in /etc/hosts 1407 */ 1408 1409 hp = sm_gethostbyname(name); 1410 if (hp == NULL) 1411 { 1412 /* no dice there either */ 1413 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1414 return NULL; 1415 } 1416 1417 s->s_namecanon.nc_stat = *statp = EX_OK; 1418 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1419 s->s_namecanon.nc_cname = newstr(cp); 1420 return cp; 1421 } 1422 } 1423 if ((cp = strchr(name, ']')) == NULL) 1424 return (NULL); 1425 *cp = '\0'; 1426 in_addr.s_addr = inet_addr(&name[1]); 1427 1428 /* nope -- ask the name server */ 1429 hp = sm_gethostbyaddr((char *)&in_addr, INADDRSZ, AF_INET); 1430 s->s_namecanon.nc_errno = errno; 1431 #if NAMED_BIND 1432 s->s_namecanon.nc_herrno = h_errno; 1433 #endif 1434 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1435 if (hp == NULL) 1436 { 1437 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1438 return (NULL); 1439 } 1440 1441 /* found a match -- copy out */ 1442 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1443 s->s_namecanon.nc_stat = *statp = EX_OK; 1444 s->s_namecanon.nc_cname = newstr(cp); 1445 return cp; 1446 } 1447 /* 1448 ** ANYNET_NTOA -- convert a network address to printable form. 1449 ** 1450 ** Parameters: 1451 ** sap -- a pointer to a sockaddr structure. 1452 ** 1453 ** Returns: 1454 ** A printable version of that sockaddr. 1455 */ 1456 1457 #if NETLINK 1458 # include <net/if_dl.h> 1459 #endif 1460 1461 char * 1462 anynet_ntoa(sap) 1463 register SOCKADDR *sap; 1464 { 1465 register char *bp; 1466 register char *ap; 1467 int l; 1468 static char buf[100]; 1469 1470 /* check for null/zero family */ 1471 if (sap == NULL) 1472 return "NULLADDR"; 1473 if (sap->sa.sa_family == 0) 1474 return "0"; 1475 1476 switch (sap->sa.sa_family) 1477 { 1478 #if NETUNIX 1479 case AF_UNIX: 1480 if (sap->sunix.sun_path[0] != '\0') 1481 sprintf(buf, "[UNIX: %.64s]", sap->sunix.sun_path); 1482 else 1483 sprintf(buf, "[UNIX: localhost]"); 1484 return buf; 1485 #endif 1486 1487 #if NETINET 1488 case AF_INET: 1489 return inet_ntoa(sap->sin.sin_addr); 1490 #endif 1491 1492 #if NETLINK 1493 case AF_LINK: 1494 sprintf(buf, "[LINK: %s]", 1495 link_ntoa((struct sockaddr_dl *) &sap->sa)); 1496 return buf; 1497 #endif 1498 default: 1499 /* this case is needed when nothing is #defined */ 1500 /* in order to keep the switch syntactically correct */ 1501 break; 1502 } 1503 1504 /* unknown family -- just dump bytes */ 1505 (void) sprintf(buf, "Family %d: ", sap->sa.sa_family); 1506 bp = &buf[strlen(buf)]; 1507 ap = sap->sa.sa_data; 1508 for (l = sizeof sap->sa.sa_data; --l >= 0; ) 1509 { 1510 (void) sprintf(bp, "%02x:", *ap++ & 0377); 1511 bp += 3; 1512 } 1513 *--bp = '\0'; 1514 return buf; 1515 } 1516 /* 1517 ** HOSTNAMEBYANYADDR -- return name of host based on address 1518 ** 1519 ** Parameters: 1520 ** sap -- SOCKADDR pointer 1521 ** 1522 ** Returns: 1523 ** text representation of host name. 1524 ** 1525 ** Side Effects: 1526 ** none. 1527 */ 1528 1529 char * 1530 hostnamebyanyaddr(sap) 1531 register SOCKADDR *sap; 1532 { 1533 register struct hostent *hp; 1534 int saveretry; 1535 1536 #if NAMED_BIND 1537 /* shorten name server timeout to avoid higher level timeouts */ 1538 saveretry = _res.retry; 1539 _res.retry = 3; 1540 #endif /* NAMED_BIND */ 1541 1542 switch (sap->sa.sa_family) 1543 { 1544 #if NETINET 1545 case AF_INET: 1546 hp = sm_gethostbyaddr((char *) &sap->sin.sin_addr, 1547 INADDRSZ, 1548 AF_INET); 1549 break; 1550 #endif 1551 1552 #if NETISO 1553 case AF_ISO: 1554 hp = sm_gethostbyaddr((char *) &sap->siso.siso_addr, 1555 sizeof sap->siso.siso_addr, 1556 AF_ISO); 1557 break; 1558 #endif 1559 1560 case AF_UNIX: 1561 hp = NULL; 1562 break; 1563 1564 default: 1565 hp = sm_gethostbyaddr(sap->sa.sa_data, 1566 sizeof sap->sa.sa_data, 1567 sap->sa.sa_family); 1568 break; 1569 } 1570 1571 #if NAMED_BIND 1572 _res.retry = saveretry; 1573 #endif /* NAMED_BIND */ 1574 1575 if (hp != NULL) 1576 return hp->h_name; 1577 else 1578 { 1579 /* produce a dotted quad */ 1580 static char buf[512]; 1581 1582 (void) sprintf(buf, "[%s]", anynet_ntoa(sap)); 1583 return buf; 1584 } 1585 } 1586 1587 # else /* DAEMON */ 1588 /* code for systems without sophisticated networking */ 1589 1590 /* 1591 ** MYHOSTNAME -- stub version for case of no daemon code. 1592 ** 1593 ** Can't convert to upper case here because might be a UUCP name. 1594 ** 1595 ** Mark, you can change this to be anything you want...... 1596 */ 1597 1598 char ** 1599 myhostname(hostbuf, size) 1600 char hostbuf[]; 1601 int size; 1602 { 1603 register FILE *f; 1604 1605 hostbuf[0] = '\0'; 1606 f = fopen("/usr/include/whoami", "r"); 1607 if (f != NULL) 1608 { 1609 (void) fgets(hostbuf, size, f); 1610 fixcrlf(hostbuf, TRUE); 1611 (void) fclose(f); 1612 } 1613 return (NULL); 1614 } 1615 /* 1616 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 1617 ** 1618 ** Parameters: 1619 ** fd -- the descriptor 1620 ** 1621 ** Returns: 1622 ** The host name associated with this descriptor, if it can 1623 ** be determined. 1624 ** NULL otherwise. 1625 ** 1626 ** Side Effects: 1627 ** none 1628 */ 1629 1630 char * 1631 getauthinfo(fd) 1632 int fd; 1633 { 1634 return NULL; 1635 } 1636 /* 1637 ** MAPHOSTNAME -- turn a hostname into canonical form 1638 ** 1639 ** Parameters: 1640 ** map -- a pointer to the database map. 1641 ** name -- a buffer containing a hostname. 1642 ** avp -- a pointer to a (cf file defined) argument vector. 1643 ** statp -- an exit status (out parameter). 1644 ** 1645 ** Returns: 1646 ** mapped host name 1647 ** FALSE otherwise. 1648 ** 1649 ** Side Effects: 1650 ** Looks up the host specified in name. If it is not 1651 ** the canonical name for that host, replace it with 1652 ** the canonical name. If the name is unknown, or it 1653 ** is already the canonical name, leave it unchanged. 1654 */ 1655 1656 /*ARGSUSED*/ 1657 char * 1658 host_map_lookup(map, name, avp, statp) 1659 MAP *map; 1660 char *name; 1661 char **avp; 1662 char *statp; 1663 { 1664 register struct hostent *hp; 1665 1666 hp = sm_gethostbyname(name); 1667 if (hp != NULL) 1668 return hp->h_name; 1669 *statp = EX_NOHOST; 1670 return NULL; 1671 } 1672 1673 #endif /* DAEMON */ 1674