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 #include <errno.h> 10 #include "sendmail.h" 11 12 #ifndef lint 13 #ifdef DAEMON 14 static char sccsid[] = "@(#)daemon.c 8.59 (Berkeley) 08/16/94 (with daemon mode)"; 15 #else 16 static char sccsid[] = "@(#)daemon.c 8.59 (Berkeley) 08/16/94 (without daemon mode)"; 17 #endif 18 #endif /* not lint */ 19 20 #ifdef DAEMON 21 22 # include <netdb.h> 23 # include <arpa/inet.h> 24 25 #if NAMED_BIND 26 # include <resolv.h> 27 #endif 28 29 /* 30 ** DAEMON.C -- routines to use when running as a daemon. 31 ** 32 ** This entire file is highly dependent on the 4.2 BSD 33 ** interprocess communication primitives. No attempt has 34 ** been made to make this file portable to Version 7, 35 ** Version 6, MPX files, etc. If you should try such a 36 ** thing yourself, I recommend chucking the entire file 37 ** and starting from scratch. Basic semantics are: 38 ** 39 ** getrequests() 40 ** Opens a port and initiates a connection. 41 ** Returns in a child. Must set InChannel and 42 ** OutChannel appropriately. 43 ** clrdaemon() 44 ** Close any open files associated with getting 45 ** the connection; this is used when running the queue, 46 ** etc., to avoid having extra file descriptors during 47 ** the queue run and to avoid confusing the network 48 ** code (if it cares). 49 ** makeconnection(host, port, outfile, infile, usesecureport) 50 ** Make a connection to the named host on the given 51 ** port. Set *outfile and *infile to the files 52 ** appropriate for communication. Returns zero on 53 ** success, else an exit status describing the 54 ** error. 55 ** host_map_lookup(map, hbuf, avp, pstat) 56 ** Convert the entry in hbuf into a canonical form. 57 */ 58 /* 59 ** GETREQUESTS -- open mail IPC port and get requests. 60 ** 61 ** Parameters: 62 ** none. 63 ** 64 ** Returns: 65 ** none. 66 ** 67 ** Side Effects: 68 ** Waits until some interesting activity occurs. When 69 ** it does, a child is created to process it, and the 70 ** parent waits for completion. Return from this 71 ** routine is always in the child. The file pointers 72 ** "InChannel" and "OutChannel" should be set to point 73 ** to the communication channel. 74 */ 75 76 int DaemonSocket = -1; /* fd describing socket */ 77 SOCKADDR DaemonAddr; /* socket for incoming */ 78 int ListenQueueSize = 10; /* size of listen queue */ 79 int TcpRcvBufferSize = 0; /* size of TCP receive buffer */ 80 int TcpSndBufferSize = 0; /* size of TCP send buffer */ 81 82 getrequests() 83 { 84 int t; 85 bool refusingconnections = TRUE; 86 FILE *pidf; 87 int socksize; 88 #ifdef XDEBUG 89 bool j_has_dot; 90 #endif 91 extern void reapchild(); 92 93 /* 94 ** Set up the address for the mailer. 95 */ 96 97 if (DaemonAddr.sin.sin_family == 0) 98 DaemonAddr.sin.sin_family = AF_INET; 99 if (DaemonAddr.sin.sin_addr.s_addr == 0) 100 DaemonAddr.sin.sin_addr.s_addr = INADDR_ANY; 101 if (DaemonAddr.sin.sin_port == 0) 102 { 103 register struct servent *sp; 104 105 sp = getservbyname("smtp", "tcp"); 106 if (sp == NULL) 107 { 108 syserr("554 service \"smtp\" unknown"); 109 DaemonAddr.sin.sin_port = htons(25); 110 } 111 else 112 DaemonAddr.sin.sin_port = sp->s_port; 113 } 114 115 /* 116 ** Try to actually open the connection. 117 */ 118 119 if (tTd(15, 1)) 120 printf("getrequests: port 0x%x\n", DaemonAddr.sin.sin_port); 121 122 /* get a socket for the SMTP connection */ 123 socksize = opendaemonsocket(TRUE); 124 125 (void) setsignal(SIGCHLD, reapchild); 126 127 /* write the pid to the log file for posterity */ 128 pidf = fopen(PidFile, "w"); 129 if (pidf != NULL) 130 { 131 extern char *CommandLineArgs; 132 133 /* write the process id on line 1 */ 134 fprintf(pidf, "%d\n", getpid()); 135 136 /* line 2 contains all command line flags */ 137 fprintf(pidf, "%s\n", CommandLineArgs); 138 139 /* flush and close */ 140 fclose(pidf); 141 } 142 143 #ifdef XDEBUG 144 { 145 char jbuf[MAXHOSTNAMELEN]; 146 147 expand("\201j", jbuf, &jbuf[sizeof jbuf - 1], CurEnv); 148 j_has_dot = strchr(jbuf, '.') != NULL; 149 } 150 #endif 151 152 if (tTd(15, 1)) 153 printf("getrequests: %d\n", DaemonSocket); 154 155 for (;;) 156 { 157 register int pid; 158 auto int lotherend; 159 extern bool refuseconnections(); 160 161 /* see if we are rejecting connections */ 162 CurrentLA = getla(); 163 if (refuseconnections()) 164 { 165 if (DaemonSocket >= 0) 166 { 167 /* close socket so peer will fail quickly */ 168 (void) close(DaemonSocket); 169 DaemonSocket = -1; 170 } 171 refusingconnections = TRUE; 172 setproctitle("rejecting connections: load average: %d", 173 CurrentLA); 174 sleep(15); 175 continue; 176 } 177 178 /* arrange to (re)open the socket if necessary */ 179 if (refusingconnections) 180 { 181 (void) opendaemonsocket(FALSE); 182 setproctitle("accepting connections"); 183 refusingconnections = FALSE; 184 } 185 186 #ifdef XDEBUG 187 /* check for disaster */ 188 { 189 register STAB *s; 190 char jbuf[MAXHOSTNAMELEN]; 191 192 expand("\201j", jbuf, &jbuf[sizeof jbuf - 1], CurEnv); 193 if ((s = stab(jbuf, ST_CLASS, ST_FIND)) == NULL || 194 !bitnset('w', s->s_class)) 195 { 196 dumpstate("daemon lost $j"); 197 syslog(LOG_ALERT, "daemon process doesn't have $j in $=w; see syslog"); 198 abort(); 199 } 200 else if (j_has_dot && strchr(jbuf, '.') == NULL) 201 { 202 dumpstate("daemon $j lost dot"); 203 syslog(LOG_ALERT, "daemon process $j lost dot; see syslog"); 204 abort(); 205 } 206 } 207 #endif 208 209 /* wait for a connection */ 210 do 211 { 212 errno = 0; 213 lotherend = socksize; 214 t = accept(DaemonSocket, 215 (struct sockaddr *)&RealHostAddr, &lotherend); 216 } while (t < 0 && errno == EINTR); 217 if (t < 0) 218 { 219 syserr("getrequests: accept"); 220 221 /* arrange to re-open the socket next time around */ 222 (void) close(DaemonSocket); 223 DaemonSocket = -1; 224 sleep(5); 225 continue; 226 } 227 228 /* 229 ** Create a subprocess to process the mail. 230 */ 231 232 if (tTd(15, 2)) 233 printf("getrequests: forking (fd = %d)\n", t); 234 235 pid = fork(); 236 if (pid < 0) 237 { 238 syserr("daemon: cannot fork"); 239 sleep(10); 240 (void) close(t); 241 continue; 242 } 243 244 if (pid == 0) 245 { 246 char *p; 247 extern char *hostnamebyanyaddr(); 248 249 /* 250 ** CHILD -- return to caller. 251 ** Collect verified idea of sending host. 252 ** Verify calling user id if possible here. 253 */ 254 255 (void) setsignal(SIGCHLD, SIG_DFL); 256 (void) close(DaemonSocket); 257 DisConnected = FALSE; 258 259 setproctitle("startup with %s", 260 anynet_ntoa(&RealHostAddr)); 261 262 /* determine host name */ 263 p = hostnamebyanyaddr(&RealHostAddr); 264 RealHostName = newstr(p); 265 setproctitle("startup with %s", p); 266 267 #ifdef LOG 268 if (LogLevel > 11) 269 { 270 /* log connection information */ 271 syslog(LOG_INFO, "connect from %s (%s)", 272 RealHostName, anynet_ntoa(&RealHostAddr)); 273 } 274 #endif 275 276 if ((InChannel = fdopen(t, "r")) == NULL || 277 (t = dup(t)) < 0 || 278 (OutChannel = fdopen(t, "w")) == NULL) 279 { 280 syserr("cannot open SMTP server channel, fd=%d", t); 281 exit(0); 282 } 283 284 /* should we check for illegal connection here? XXX */ 285 #ifdef XLA 286 if (!xla_host_ok(RealHostName)) 287 { 288 message("421 Too many SMTP sessions for this host"); 289 exit(0); 290 } 291 #endif 292 293 if (tTd(15, 2)) 294 printf("getreq: returning\n"); 295 return; 296 } 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; 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 # ifdef NETINET 380 case AF_INET: 381 socksize = sizeof DaemonAddr.sin; 382 break; 383 # endif 384 385 # ifdef 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 clrdaemon() 430 { 431 if (DaemonSocket >= 0) 432 (void) close(DaemonSocket); 433 DaemonSocket = -1; 434 } 435 /* 436 ** SETDAEMONOPTIONS -- set options for running the daemon 437 ** 438 ** Parameters: 439 ** p -- the options line. 440 ** 441 ** Returns: 442 ** none. 443 */ 444 445 setdaemonoptions(p) 446 register char *p; 447 { 448 if (DaemonAddr.sa.sa_family == AF_UNSPEC) 449 DaemonAddr.sa.sa_family = AF_INET; 450 451 while (p != NULL) 452 { 453 register char *f; 454 register char *v; 455 456 while (isascii(*p) && isspace(*p)) 457 p++; 458 if (*p == '\0') 459 break; 460 f = p; 461 p = strchr(p, ','); 462 if (p != NULL) 463 *p++ = '\0'; 464 v = strchr(f, '='); 465 if (v == NULL) 466 continue; 467 while (isascii(*++v) && isspace(*v)) 468 continue; 469 470 switch (*f) 471 { 472 case 'F': /* address family */ 473 if (isascii(*v) && isdigit(*v)) 474 DaemonAddr.sa.sa_family = atoi(v); 475 #ifdef NETINET 476 else if (strcasecmp(v, "inet") == 0) 477 DaemonAddr.sa.sa_family = AF_INET; 478 #endif 479 #ifdef NETISO 480 else if (strcasecmp(v, "iso") == 0) 481 DaemonAddr.sa.sa_family = AF_ISO; 482 #endif 483 #ifdef NETNS 484 else if (strcasecmp(v, "ns") == 0) 485 DaemonAddr.sa.sa_family = AF_NS; 486 #endif 487 #ifdef NETX25 488 else if (strcasecmp(v, "x.25") == 0) 489 DaemonAddr.sa.sa_family = AF_CCITT; 490 #endif 491 else 492 syserr("554 Unknown address family %s in Family=option", v); 493 break; 494 495 case 'A': /* address */ 496 switch (DaemonAddr.sa.sa_family) 497 { 498 #ifdef NETINET 499 case AF_INET: 500 if (isascii(*v) && isdigit(*v)) 501 DaemonAddr.sin.sin_addr.s_addr = inet_network(v); 502 else 503 { 504 register struct netent *np; 505 506 np = getnetbyname(v); 507 if (np == NULL) 508 syserr("554 network \"%s\" unknown", v); 509 else 510 DaemonAddr.sin.sin_addr.s_addr = np->n_net; 511 } 512 break; 513 #endif 514 515 default: 516 syserr("554 Address= option unsupported for family %d", 517 DaemonAddr.sa.sa_family); 518 break; 519 } 520 break; 521 522 case 'P': /* port */ 523 switch (DaemonAddr.sa.sa_family) 524 { 525 short port; 526 527 #ifdef NETINET 528 case AF_INET: 529 if (isascii(*v) && isdigit(*v)) 530 DaemonAddr.sin.sin_port = htons(atoi(v)); 531 else 532 { 533 register struct servent *sp; 534 535 sp = getservbyname(v, "tcp"); 536 if (sp == NULL) 537 syserr("554 service \"%s\" unknown", v); 538 else 539 DaemonAddr.sin.sin_port = sp->s_port; 540 } 541 break; 542 #endif 543 544 #ifdef NETISO 545 case AF_ISO: 546 /* assume two byte transport selector */ 547 if (isascii(*v) && isdigit(*v)) 548 port = htons(atoi(v)); 549 else 550 { 551 register struct servent *sp; 552 553 sp = getservbyname(v, "tcp"); 554 if (sp == NULL) 555 syserr("554 service \"%s\" unknown", v); 556 else 557 port = sp->s_port; 558 } 559 bcopy((char *) &port, TSEL(&DaemonAddr.siso), 2); 560 break; 561 #endif 562 563 default: 564 syserr("554 Port= option unsupported for family %d", 565 DaemonAddr.sa.sa_family); 566 break; 567 } 568 break; 569 570 case 'L': /* listen queue size */ 571 ListenQueueSize = atoi(v); 572 break; 573 574 case 'S': /* send buffer size */ 575 TcpSndBufferSize = atoi(v); 576 break; 577 578 case 'R': /* receive buffer size */ 579 TcpRcvBufferSize = atoi(v); 580 break; 581 } 582 } 583 } 584 /* 585 ** MAKECONNECTION -- make a connection to an SMTP socket on another machine. 586 ** 587 ** Parameters: 588 ** host -- the name of the host. 589 ** port -- the port number to connect to. 590 ** mci -- a pointer to the mail connection information 591 ** structure to be filled in. 592 ** usesecureport -- if set, use a low numbered (reserved) 593 ** port to provide some rudimentary authentication. 594 ** 595 ** Returns: 596 ** An exit code telling whether the connection could be 597 ** made and if not why not. 598 ** 599 ** Side Effects: 600 ** none. 601 */ 602 603 SOCKADDR CurHostAddr; /* address of current host */ 604 605 int 606 makeconnection(host, port, mci, usesecureport) 607 char *host; 608 u_short port; 609 register MCI *mci; 610 bool usesecureport; 611 { 612 register int i, s; 613 register struct hostent *hp = (struct hostent *)NULL; 614 SOCKADDR addr; 615 int sav_errno; 616 int addrlen; 617 #if NAMED_BIND 618 extern int h_errno; 619 #endif 620 621 /* 622 ** Set up the address for the mailer. 623 ** Accept "[a.b.c.d]" syntax for host name. 624 */ 625 626 #if NAMED_BIND 627 h_errno = 0; 628 #endif 629 errno = 0; 630 bzero(&CurHostAddr, sizeof CurHostAddr); 631 SmtpPhase = mci->mci_phase = "initial connection"; 632 CurHostName = host; 633 634 if (host[0] == '[') 635 { 636 long hid; 637 register char *p = strchr(host, ']'); 638 639 if (p != NULL) 640 { 641 *p = '\0'; 642 #ifdef NETINET 643 hid = inet_addr(&host[1]); 644 if (hid == -1) 645 #endif 646 { 647 /* try it as a host name (avoid MX lookup) */ 648 hp = gethostbyname(&host[1]); 649 if (hp == NULL && p[-1] == '.') 650 { 651 #ifdef NAMED_BIND 652 int oldopts = _res.options; 653 654 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); 655 #endif 656 p[-1] = '\0'; 657 hp = gethostbyname(&host[1]); 658 p[-1] = '.'; 659 #ifdef NAMED_BIND 660 _res.options = oldopts; 661 #endif 662 } 663 *p = ']'; 664 goto gothostent; 665 } 666 *p = ']'; 667 } 668 if (p == NULL) 669 { 670 usrerr("553 Invalid numeric domain spec \"%s\"", host); 671 return (EX_NOHOST); 672 } 673 #ifdef NETINET 674 addr.sin.sin_family = AF_INET; /*XXX*/ 675 addr.sin.sin_addr.s_addr = hid; 676 #endif 677 } 678 else 679 { 680 register char *p = &host[strlen(host) - 1]; 681 682 hp = gethostbyname(host); 683 if (hp == NULL && *p == '.') 684 { 685 #ifdef NAMED_BIND 686 int oldopts = _res.options; 687 688 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); 689 #endif 690 *p = '\0'; 691 hp = gethostbyname(host); 692 *p = '.'; 693 #ifdef NAMED_BIND 694 _res.options = oldopts; 695 #endif 696 } 697 gothostent: 698 if (hp == NULL) 699 { 700 #if NAMED_BIND 701 if (errno == ETIMEDOUT || h_errno == TRY_AGAIN) 702 return (EX_TEMPFAIL); 703 704 /* if name server is specified, assume temp fail */ 705 if (errno == ECONNREFUSED && UseNameServer) 706 return (EX_TEMPFAIL); 707 #endif 708 return (EX_NOHOST); 709 } 710 addr.sa.sa_family = hp->h_addrtype; 711 switch (hp->h_addrtype) 712 { 713 #ifdef NETINET 714 case AF_INET: 715 bcopy(hp->h_addr, 716 &addr.sin.sin_addr, 717 INADDRSZ); 718 break; 719 #endif 720 721 default: 722 bcopy(hp->h_addr, 723 addr.sa.sa_data, 724 hp->h_length); 725 break; 726 } 727 i = 1; 728 } 729 730 /* 731 ** Determine the port number. 732 */ 733 734 if (port != 0) 735 port = htons(port); 736 else 737 { 738 register struct servent *sp = getservbyname("smtp", "tcp"); 739 740 if (sp == NULL) 741 { 742 syserr("554 makeconnection: service \"smtp\" unknown"); 743 port = htons(25); 744 } 745 else 746 port = sp->s_port; 747 } 748 749 switch (addr.sa.sa_family) 750 { 751 #ifdef NETINET 752 case AF_INET: 753 addr.sin.sin_port = port; 754 addrlen = sizeof (struct sockaddr_in); 755 break; 756 #endif 757 758 #ifdef NETISO 759 case AF_ISO: 760 /* assume two byte transport selector */ 761 bcopy((char *) &port, TSEL((struct sockaddr_iso *) &addr), 2); 762 addrlen = sizeof (struct sockaddr_iso); 763 break; 764 #endif 765 766 default: 767 syserr("Can't connect to address family %d", addr.sa.sa_family); 768 return (EX_NOHOST); 769 } 770 771 /* 772 ** Try to actually open the connection. 773 */ 774 775 #ifdef XLA 776 /* if too many connections, don't bother trying */ 777 if (!xla_noqueue_ok(host)) 778 return EX_TEMPFAIL; 779 #endif 780 781 for (;;) 782 { 783 if (tTd(16, 1)) 784 printf("makeconnection (%s [%s])\n", 785 host, anynet_ntoa(&addr)); 786 787 /* save for logging */ 788 CurHostAddr = addr; 789 790 if (usesecureport) 791 { 792 int rport = IPPORT_RESERVED - 1; 793 794 s = rresvport(&rport); 795 } 796 else 797 { 798 s = socket(AF_INET, SOCK_STREAM, 0); 799 } 800 if (s < 0) 801 { 802 sav_errno = errno; 803 syserr("makeconnection: no socket"); 804 goto failure; 805 } 806 807 #ifdef SO_SNDBUF 808 if (TcpSndBufferSize > 0) 809 { 810 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, 811 (char *) &TcpSndBufferSize, 812 sizeof(TcpSndBufferSize)) < 0) 813 syserr("makeconnection: setsockopt(SO_SNDBUF)"); 814 } 815 #endif 816 817 if (tTd(16, 1)) 818 printf("makeconnection: fd=%d\n", s); 819 820 /* turn on network debugging? */ 821 if (tTd(16, 101)) 822 { 823 int on = 1; 824 (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, 825 (char *)&on, sizeof on); 826 } 827 if (CurEnv->e_xfp != NULL) 828 (void) fflush(CurEnv->e_xfp); /* for debugging */ 829 errno = 0; /* for debugging */ 830 if (connect(s, (struct sockaddr *) &addr, addrlen) >= 0) 831 break; 832 833 /* couldn't connect.... figure out why */ 834 sav_errno = errno; 835 (void) close(s); 836 if (hp && hp->h_addr_list[i]) 837 { 838 if (tTd(16, 1)) 839 printf("Connect failed (%s); trying new address....\n", 840 errstring(sav_errno)); 841 switch (addr.sa.sa_family) 842 { 843 #ifdef NETINET 844 case AF_INET: 845 bcopy(hp->h_addr_list[i++], 846 &addr.sin.sin_addr, 847 INADDRSZ); 848 break; 849 #endif 850 851 default: 852 bcopy(hp->h_addr_list[i++], 853 addr.sa.sa_data, 854 hp->h_length); 855 break; 856 } 857 continue; 858 } 859 860 /* failure, decide if temporary or not */ 861 failure: 862 #ifdef XLA 863 xla_host_end(host); 864 #endif 865 if (transienterror(sav_errno)) 866 return EX_TEMPFAIL; 867 else 868 { 869 message("%s", errstring(sav_errno)); 870 return (EX_UNAVAILABLE); 871 } 872 } 873 874 /* connection ok, put it into canonical form */ 875 if ((mci->mci_out = fdopen(s, "w")) == NULL || 876 (s = dup(s)) < 0 || 877 (mci->mci_in = fdopen(s, "r")) == NULL) 878 { 879 syserr("cannot open SMTP client channel, fd=%d", s); 880 return EX_TEMPFAIL; 881 } 882 883 return (EX_OK); 884 } 885 /* 886 ** MYHOSTNAME -- return the name of this host. 887 ** 888 ** Parameters: 889 ** hostbuf -- a place to return the name of this host. 890 ** size -- the size of hostbuf. 891 ** 892 ** Returns: 893 ** A list of aliases for this host. 894 ** 895 ** Side Effects: 896 ** Adds numeric codes to $=w. 897 */ 898 899 struct hostent * 900 myhostname(hostbuf, size) 901 char hostbuf[]; 902 int size; 903 { 904 register struct hostent *hp; 905 extern struct hostent *gethostbyname(); 906 extern bool getcanonname(); 907 extern int h_errno; 908 909 if (gethostname(hostbuf, size) < 0) 910 { 911 (void) strcpy(hostbuf, "localhost"); 912 } 913 hp = gethostbyname(hostbuf); 914 if (hp == NULL) 915 { 916 syserr("!My host name (%s) does not seem to exist!", hostbuf); 917 } 918 if (strchr(hp->h_name, '.') != NULL || strchr(hostbuf, '.') == NULL) 919 { 920 (void) strncpy(hostbuf, hp->h_name, size - 1); 921 hostbuf[size - 1] = '\0'; 922 } 923 924 #if NAMED_BIND 925 /* 926 ** If still no dot, try DNS directly (i.e., avoid NIS problems). 927 ** This ought to be driven from the configuration file, but 928 ** we are called before the configuration is read. We could 929 ** check for an /etc/resolv.conf file, but that isn't required. 930 ** All in all, a bit of a mess. 931 */ 932 933 if (strchr(hostbuf, '.') == NULL && 934 !getcanonname(hostbuf, size, TRUE) && 935 h_errno == TRY_AGAIN) 936 { 937 struct stat stbuf; 938 939 /* try twice in case name server not yet started up */ 940 message("My unqualifed host name (%s) unknown to DNS; sleeping for retry", 941 hostbuf); 942 sleep(60); 943 if (!getcanonname(hostbuf, size, TRUE)) 944 errno = h_errno + E_DNSBASE; 945 } 946 #endif 947 return (hp); 948 } 949 /* 950 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 951 ** 952 ** Uses RFC1413 protocol to try to get info from the other end. 953 ** 954 ** Parameters: 955 ** fd -- the descriptor 956 ** 957 ** Returns: 958 ** The user@host information associated with this descriptor. 959 */ 960 961 #if IDENTPROTO 962 963 static jmp_buf CtxAuthTimeout; 964 965 static 966 authtimeout() 967 { 968 longjmp(CtxAuthTimeout, 1); 969 } 970 971 #endif 972 973 char * 974 getauthinfo(fd) 975 int fd; 976 { 977 int falen; 978 register char *p; 979 #if IDENTPROTO 980 SOCKADDR la; 981 int lalen; 982 register struct servent *sp; 983 int s; 984 int i; 985 EVENT *ev; 986 #endif 987 static char hbuf[MAXNAME * 2 + 2]; 988 extern char *hostnamebyanyaddr(); 989 extern char RealUserName[]; /* main.c */ 990 991 falen = sizeof RealHostAddr; 992 if (isatty(fd) || getpeername(fd, &RealHostAddr.sa, &falen) < 0 || 993 falen <= 0 || RealHostAddr.sa.sa_family == 0) 994 { 995 (void) sprintf(hbuf, "%s@localhost", RealUserName); 996 if (tTd(9, 1)) 997 printf("getauthinfo: %s\n", hbuf); 998 return hbuf; 999 } 1000 1001 if (RealHostName == NULL) 1002 { 1003 /* translate that to a host name */ 1004 RealHostName = newstr(hostnamebyanyaddr(&RealHostAddr)); 1005 } 1006 1007 #if IDENTPROTO 1008 if (TimeOuts.to_ident == 0) 1009 goto noident; 1010 1011 lalen = sizeof la; 1012 if (RealHostAddr.sa.sa_family != AF_INET || 1013 getsockname(fd, &la.sa, &lalen) < 0 || lalen <= 0 || 1014 la.sa.sa_family != AF_INET) 1015 { 1016 /* no ident info */ 1017 goto noident; 1018 } 1019 1020 /* create ident query */ 1021 (void) sprintf(hbuf, "%d,%d\r\n", 1022 ntohs(RealHostAddr.sin.sin_port), ntohs(la.sin.sin_port)); 1023 1024 /* create local address */ 1025 la.sin.sin_port = 0; 1026 1027 /* create foreign address */ 1028 sp = getservbyname("auth", "tcp"); 1029 if (sp != NULL) 1030 RealHostAddr.sin.sin_port = sp->s_port; 1031 else 1032 RealHostAddr.sin.sin_port = htons(113); 1033 1034 s = -1; 1035 if (setjmp(CtxAuthTimeout) != 0) 1036 { 1037 if (s >= 0) 1038 (void) close(s); 1039 goto noident; 1040 } 1041 1042 /* put a timeout around the whole thing */ 1043 ev = setevent(TimeOuts.to_ident, authtimeout, 0); 1044 1045 /* connect to foreign IDENT server using same address as SMTP socket */ 1046 s = socket(AF_INET, SOCK_STREAM, 0); 1047 if (s < 0) 1048 { 1049 clrevent(ev); 1050 goto noident; 1051 } 1052 if (bind(s, &la.sa, sizeof la.sin) < 0 || 1053 connect(s, &RealHostAddr.sa, sizeof RealHostAddr.sin) < 0) 1054 { 1055 goto closeident; 1056 } 1057 1058 if (tTd(9, 10)) 1059 printf("getauthinfo: sent %s", hbuf); 1060 1061 /* send query */ 1062 if (write(s, hbuf, strlen(hbuf)) < 0) 1063 goto closeident; 1064 1065 /* get result */ 1066 i = read(s, hbuf, sizeof hbuf); 1067 (void) close(s); 1068 clrevent(ev); 1069 if (i <= 0) 1070 goto noident; 1071 if (hbuf[--i] == '\n' && hbuf[--i] == '\r') 1072 i--; 1073 hbuf[++i] = '\0'; 1074 1075 if (tTd(9, 3)) 1076 printf("getauthinfo: got %s\n", hbuf); 1077 1078 /* parse result */ 1079 p = strchr(hbuf, ':'); 1080 if (p == NULL) 1081 { 1082 /* malformed response */ 1083 goto noident; 1084 } 1085 while (isascii(*++p) && isspace(*p)) 1086 continue; 1087 if (strncasecmp(p, "userid", 6) != 0) 1088 { 1089 /* presumably an error string */ 1090 goto noident; 1091 } 1092 p += 6; 1093 while (isascii(*p) && isspace(*p)) 1094 p++; 1095 if (*p++ != ':') 1096 { 1097 /* either useridxx or malformed response */ 1098 goto noident; 1099 } 1100 1101 /* p now points to the OSTYPE field */ 1102 p = strchr(p, ':'); 1103 if (p == NULL) 1104 { 1105 /* malformed response */ 1106 goto noident; 1107 } 1108 1109 /* 1413 says don't do this -- but it's broken otherwise */ 1110 while (isascii(*++p) && isspace(*p)) 1111 continue; 1112 1113 /* p now points to the authenticated name */ 1114 (void) sprintf(hbuf, "%s@%s", 1115 p, RealHostName == NULL ? "localhost" : RealHostName); 1116 goto finish; 1117 1118 closeident: 1119 (void) close(s); 1120 clrevent(ev); 1121 1122 #endif /* IDENTPROTO */ 1123 1124 noident: 1125 if (RealHostName == NULL) 1126 { 1127 if (tTd(9, 1)) 1128 printf("getauthinfo: NULL\n"); 1129 return NULL; 1130 } 1131 (void) strcpy(hbuf, RealHostName); 1132 1133 finish: 1134 if (RealHostName != NULL && RealHostName[0] != '[') 1135 { 1136 p = &hbuf[strlen(hbuf)]; 1137 (void) sprintf(p, " [%s]", anynet_ntoa(&RealHostAddr)); 1138 } 1139 if (tTd(9, 1)) 1140 printf("getauthinfo: %s\n", hbuf); 1141 return hbuf; 1142 } 1143 /* 1144 ** HOST_MAP_LOOKUP -- turn a hostname into canonical form 1145 ** 1146 ** Parameters: 1147 ** map -- a pointer to this map (unused). 1148 ** name -- the (presumably unqualified) hostname. 1149 ** av -- unused -- for compatibility with other mapping 1150 ** functions. 1151 ** statp -- an exit status (out parameter) -- set to 1152 ** EX_TEMPFAIL if the name server is unavailable. 1153 ** 1154 ** Returns: 1155 ** The mapping, if found. 1156 ** NULL if no mapping found. 1157 ** 1158 ** Side Effects: 1159 ** Looks up the host specified in hbuf. If it is not 1160 ** the canonical name for that host, return the canonical 1161 ** name. 1162 */ 1163 1164 char * 1165 host_map_lookup(map, name, av, statp) 1166 MAP *map; 1167 char *name; 1168 char **av; 1169 int *statp; 1170 { 1171 register struct hostent *hp; 1172 struct in_addr in_addr; 1173 char *cp; 1174 int i; 1175 register STAB *s; 1176 char hbuf[MAXNAME]; 1177 extern struct hostent *gethostbyaddr(); 1178 #if NAMED_BIND 1179 extern int h_errno; 1180 #endif 1181 1182 /* 1183 ** See if we have already looked up this name. If so, just 1184 ** return it. 1185 */ 1186 1187 s = stab(name, ST_NAMECANON, ST_ENTER); 1188 if (bitset(NCF_VALID, s->s_namecanon.nc_flags)) 1189 { 1190 if (tTd(9, 1)) 1191 printf("host_map_lookup(%s) => CACHE %s\n", 1192 name, s->s_namecanon.nc_cname); 1193 errno = s->s_namecanon.nc_errno; 1194 #if NAMED_BIND 1195 h_errno = s->s_namecanon.nc_herrno; 1196 #endif 1197 *statp = s->s_namecanon.nc_stat; 1198 if (CurEnv->e_message == NULL && *statp == EX_TEMPFAIL) 1199 { 1200 sprintf(hbuf, "%s: Name server timeout", 1201 shortenstring(name, 33)); 1202 CurEnv->e_message = newstr(hbuf); 1203 } 1204 return s->s_namecanon.nc_cname; 1205 } 1206 1207 /* 1208 ** If first character is a bracket, then it is an address 1209 ** lookup. Address is copied into a temporary buffer to 1210 ** strip the brackets and to preserve name if address is 1211 ** unknown. 1212 */ 1213 1214 if (*name != '[') 1215 { 1216 extern bool getcanonname(); 1217 1218 if (tTd(9, 1)) 1219 printf("host_map_lookup(%s) => ", name); 1220 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1221 (void) strcpy(hbuf, name); 1222 if (getcanonname(hbuf, sizeof hbuf - 1, TRUE)) 1223 { 1224 if (tTd(9, 1)) 1225 printf("%s\n", hbuf); 1226 cp = map_rewrite(map, hbuf, strlen(hbuf), av); 1227 s->s_namecanon.nc_cname = newstr(cp); 1228 return cp; 1229 } 1230 else 1231 { 1232 register struct hostent *hp; 1233 1234 s->s_namecanon.nc_errno = errno; 1235 #if NAMED_BIND 1236 s->s_namecanon.nc_herrno = h_errno; 1237 if (tTd(9, 1)) 1238 printf("FAIL (%d)\n", h_errno); 1239 switch (h_errno) 1240 { 1241 case TRY_AGAIN: 1242 if (UseNameServer) 1243 { 1244 sprintf(hbuf, "%s: Name server timeout", 1245 shortenstring(name, 33)); 1246 message("%s", hbuf); 1247 if (CurEnv->e_message == NULL) 1248 CurEnv->e_message = newstr(hbuf); 1249 } 1250 *statp = EX_TEMPFAIL; 1251 break; 1252 1253 case HOST_NOT_FOUND: 1254 *statp = EX_NOHOST; 1255 break; 1256 1257 case NO_RECOVERY: 1258 *statp = EX_SOFTWARE; 1259 break; 1260 1261 default: 1262 *statp = EX_UNAVAILABLE; 1263 break; 1264 } 1265 #else 1266 if (tTd(9, 1)) 1267 printf("FAIL\n"); 1268 *statp = EX_NOHOST; 1269 #endif 1270 s->s_namecanon.nc_stat = *statp; 1271 if ((*statp != EX_TEMPFAIL && *statp != EX_NOHOST) || 1272 UseNameServer) 1273 return NULL; 1274 1275 /* 1276 ** Try to look it up in /etc/hosts 1277 */ 1278 1279 hp = gethostbyname(name); 1280 if (hp == NULL) 1281 { 1282 /* no dice there either */ 1283 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1284 return NULL; 1285 } 1286 1287 s->s_namecanon.nc_stat = *statp = EX_OK; 1288 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1289 s->s_namecanon.nc_cname = newstr(cp); 1290 return cp; 1291 } 1292 } 1293 if ((cp = strchr(name, ']')) == NULL) 1294 return (NULL); 1295 *cp = '\0'; 1296 in_addr.s_addr = inet_addr(&name[1]); 1297 1298 /* nope -- ask the name server */ 1299 hp = gethostbyaddr((char *)&in_addr, INADDRSZ, AF_INET); 1300 s->s_namecanon.nc_errno = errno; 1301 #if NAMED_BIND 1302 s->s_namecanon.nc_herrno = h_errno; 1303 #endif 1304 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1305 if (hp == NULL) 1306 { 1307 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1308 return (NULL); 1309 } 1310 1311 /* found a match -- copy out */ 1312 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1313 s->s_namecanon.nc_stat = *statp = EX_OK; 1314 s->s_namecanon.nc_cname = newstr(cp); 1315 return cp; 1316 } 1317 /* 1318 ** ANYNET_NTOA -- convert a network address to printable form. 1319 ** 1320 ** Parameters: 1321 ** sap -- a pointer to a sockaddr structure. 1322 ** 1323 ** Returns: 1324 ** A printable version of that sockaddr. 1325 */ 1326 1327 char * 1328 anynet_ntoa(sap) 1329 register SOCKADDR *sap; 1330 { 1331 register char *bp; 1332 register char *ap; 1333 int l; 1334 static char buf[100]; 1335 1336 /* check for null/zero family */ 1337 if (sap == NULL) 1338 return "NULLADDR"; 1339 if (sap->sa.sa_family == 0) 1340 return "0"; 1341 1342 switch (sap->sa.sa_family) 1343 { 1344 #ifdef NETUNIX 1345 case AF_UNIX: 1346 if (sap->sunix.sun_path[0] != '\0') 1347 sprintf(buf, "[UNIX: %.64s]", sap->sunix.sun_path); 1348 else 1349 sprintf(buf, "[UNIX: localhost]"); 1350 return buf; 1351 #endif 1352 1353 #ifdef NETINET 1354 case AF_INET: 1355 return inet_ntoa(((struct sockaddr_in *) sap)->sin_addr); 1356 #endif 1357 1358 default: 1359 /* this case is only to ensure syntactic correctness */ 1360 break; 1361 } 1362 1363 /* unknown family -- just dump bytes */ 1364 (void) sprintf(buf, "Family %d: ", sap->sa.sa_family); 1365 bp = &buf[strlen(buf)]; 1366 ap = sap->sa.sa_data; 1367 for (l = sizeof sap->sa.sa_data; --l >= 0; ) 1368 { 1369 (void) sprintf(bp, "%02x:", *ap++ & 0377); 1370 bp += 3; 1371 } 1372 *--bp = '\0'; 1373 return buf; 1374 } 1375 /* 1376 ** HOSTNAMEBYANYADDR -- return name of host based on address 1377 ** 1378 ** Parameters: 1379 ** sap -- SOCKADDR pointer 1380 ** 1381 ** Returns: 1382 ** text representation of host name. 1383 ** 1384 ** Side Effects: 1385 ** none. 1386 */ 1387 1388 char * 1389 hostnamebyanyaddr(sap) 1390 register SOCKADDR *sap; 1391 { 1392 register struct hostent *hp; 1393 int saveretry; 1394 1395 #if NAMED_BIND 1396 /* shorten name server timeout to avoid higher level timeouts */ 1397 saveretry = _res.retry; 1398 _res.retry = 3; 1399 #endif /* NAMED_BIND */ 1400 1401 switch (sap->sa.sa_family) 1402 { 1403 #ifdef NETINET 1404 case AF_INET: 1405 hp = gethostbyaddr((char *) &sap->sin.sin_addr, 1406 INADDRSZ, 1407 AF_INET); 1408 break; 1409 #endif 1410 1411 #ifdef NETISO 1412 case AF_ISO: 1413 hp = gethostbyaddr((char *) &sap->siso.siso_addr, 1414 sizeof sap->siso.siso_addr, 1415 AF_ISO); 1416 break; 1417 #endif 1418 1419 case AF_UNIX: 1420 hp = NULL; 1421 break; 1422 1423 default: 1424 hp = gethostbyaddr(sap->sa.sa_data, 1425 sizeof sap->sa.sa_data, 1426 sap->sa.sa_family); 1427 break; 1428 } 1429 1430 #if NAMED_BIND 1431 _res.retry = saveretry; 1432 #endif /* NAMED_BIND */ 1433 1434 if (hp != NULL) 1435 return hp->h_name; 1436 else 1437 { 1438 /* produce a dotted quad */ 1439 static char buf[512]; 1440 1441 (void) sprintf(buf, "[%s]", anynet_ntoa(sap)); 1442 return buf; 1443 } 1444 } 1445 1446 # else /* DAEMON */ 1447 /* code for systems without sophisticated networking */ 1448 1449 /* 1450 ** MYHOSTNAME -- stub version for case of no daemon code. 1451 ** 1452 ** Can't convert to upper case here because might be a UUCP name. 1453 ** 1454 ** Mark, you can change this to be anything you want...... 1455 */ 1456 1457 char ** 1458 myhostname(hostbuf, size) 1459 char hostbuf[]; 1460 int size; 1461 { 1462 register FILE *f; 1463 1464 hostbuf[0] = '\0'; 1465 f = fopen("/usr/include/whoami", "r"); 1466 if (f != NULL) 1467 { 1468 (void) fgets(hostbuf, size, f); 1469 fixcrlf(hostbuf, TRUE); 1470 (void) fclose(f); 1471 } 1472 return (NULL); 1473 } 1474 /* 1475 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 1476 ** 1477 ** Parameters: 1478 ** fd -- the descriptor 1479 ** 1480 ** Returns: 1481 ** The host name associated with this descriptor, if it can 1482 ** be determined. 1483 ** NULL otherwise. 1484 ** 1485 ** Side Effects: 1486 ** none 1487 */ 1488 1489 char * 1490 getauthinfo(fd) 1491 int fd; 1492 { 1493 return NULL; 1494 } 1495 /* 1496 ** MAPHOSTNAME -- turn a hostname into canonical form 1497 ** 1498 ** Parameters: 1499 ** map -- a pointer to the database map. 1500 ** name -- a buffer containing a hostname. 1501 ** avp -- a pointer to a (cf file defined) argument vector. 1502 ** statp -- an exit status (out parameter). 1503 ** 1504 ** Returns: 1505 ** mapped host name 1506 ** FALSE otherwise. 1507 ** 1508 ** Side Effects: 1509 ** Looks up the host specified in name. If it is not 1510 ** the canonical name for that host, replace it with 1511 ** the canonical name. If the name is unknown, or it 1512 ** is already the canonical name, leave it unchanged. 1513 */ 1514 1515 /*ARGSUSED*/ 1516 char * 1517 host_map_lookup(map, name, avp, statp) 1518 MAP *map; 1519 char *name; 1520 char **avp; 1521 char *statp; 1522 { 1523 register struct hostent *hp; 1524 1525 hp = gethostbyname(name); 1526 if (hp != NULL) 1527 return hp->h_name; 1528 *statp = EX_NOHOST; 1529 return NULL; 1530 } 1531 1532 #endif /* DAEMON */ 1533