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 8.67 (Berkeley) 01/24/95 (with daemon mode)"; 15 #else 16 static char sccsid[] = "@(#)daemon.c 8.67 (Berkeley) 01/24/95 (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 char jbuf[MAXHOSTNAMELEN]; 190 191 expand("\201j", jbuf, &jbuf[sizeof jbuf - 1], CurEnv); 192 if (!wordinclass(jbuf, 'w')) 193 { 194 dumpstate("daemon lost $j"); 195 syslog(LOG_ALERT, "daemon process doesn't have $j in $=w; see syslog"); 196 abort(); 197 } 198 else if (j_has_dot && strchr(jbuf, '.') == NULL) 199 { 200 dumpstate("daemon $j lost dot"); 201 syslog(LOG_ALERT, "daemon process $j lost dot; see syslog"); 202 abort(); 203 } 204 } 205 #endif 206 207 /* wait for a connection */ 208 do 209 { 210 errno = 0; 211 lotherend = socksize; 212 t = accept(DaemonSocket, 213 (struct sockaddr *)&RealHostAddr, &lotherend); 214 } while (t < 0 && errno == EINTR); 215 if (t < 0) 216 { 217 syserr("getrequests: accept"); 218 219 /* arrange to re-open the socket next time around */ 220 (void) close(DaemonSocket); 221 DaemonSocket = -1; 222 sleep(5); 223 continue; 224 } 225 226 /* 227 ** Create a subprocess to process the mail. 228 */ 229 230 if (tTd(15, 2)) 231 printf("getrequests: forking (fd = %d)\n", t); 232 233 pid = fork(); 234 if (pid < 0) 235 { 236 syserr("daemon: cannot fork"); 237 sleep(10); 238 (void) close(t); 239 continue; 240 } 241 242 if (pid == 0) 243 { 244 char *p; 245 extern char *hostnamebyanyaddr(); 246 extern void intsig(); 247 248 /* 249 ** CHILD -- return to caller. 250 ** Collect verified idea of sending host. 251 ** Verify calling user id if possible here. 252 */ 253 254 (void) setsignal(SIGCHLD, SIG_DFL); 255 (void) setsignal(SIGHUP, intsig); 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 = htonl(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 bool firstconnect; 618 #if NAMED_BIND 619 extern int h_errno; 620 #endif 621 622 /* 623 ** Set up the address for the mailer. 624 ** Accept "[a.b.c.d]" syntax for host name. 625 */ 626 627 #if NAMED_BIND 628 h_errno = 0; 629 #endif 630 errno = 0; 631 bzero(&CurHostAddr, sizeof CurHostAddr); 632 SmtpPhase = mci->mci_phase = "initial connection"; 633 CurHostName = host; 634 635 if (host[0] == '[') 636 { 637 long hid; 638 register char *p = strchr(host, ']'); 639 640 if (p != NULL) 641 { 642 *p = '\0'; 643 #ifdef NETINET 644 hid = inet_addr(&host[1]); 645 if (hid == -1) 646 #endif 647 { 648 /* try it as a host name (avoid MX lookup) */ 649 hp = gethostbyname(&host[1]); 650 if (hp == NULL && p[-1] == '.') 651 { 652 #if NAMED_BIND 653 int oldopts = _res.options; 654 655 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); 656 #endif 657 p[-1] = '\0'; 658 hp = gethostbyname(&host[1]); 659 p[-1] = '.'; 660 #if NAMED_BIND 661 _res.options = oldopts; 662 #endif 663 } 664 *p = ']'; 665 goto gothostent; 666 } 667 *p = ']'; 668 } 669 if (p == NULL) 670 { 671 usrerr("553 Invalid numeric domain spec \"%s\"", host); 672 return (EX_NOHOST); 673 } 674 #ifdef NETINET 675 addr.sin.sin_family = AF_INET; /*XXX*/ 676 addr.sin.sin_addr.s_addr = hid; 677 #endif 678 } 679 else 680 { 681 register char *p = &host[strlen(host) - 1]; 682 683 hp = gethostbyname(host); 684 if (hp == NULL && *p == '.') 685 { 686 #if NAMED_BIND 687 int oldopts = _res.options; 688 689 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH); 690 #endif 691 *p = '\0'; 692 hp = gethostbyname(host); 693 *p = '.'; 694 #if NAMED_BIND 695 _res.options = oldopts; 696 #endif 697 } 698 gothostent: 699 if (hp == NULL) 700 { 701 #if NAMED_BIND 702 /* check for name server timeouts */ 703 if (errno == ETIMEDOUT || h_errno == TRY_AGAIN || 704 (errno == ECONNREFUSED && UseNameServer)) 705 { 706 mci->mci_status = "466"; 707 return (EX_TEMPFAIL); 708 } 709 #endif 710 return (EX_NOHOST); 711 } 712 addr.sa.sa_family = hp->h_addrtype; 713 switch (hp->h_addrtype) 714 { 715 #ifdef NETINET 716 case AF_INET: 717 bcopy(hp->h_addr, 718 &addr.sin.sin_addr, 719 INADDRSZ); 720 break; 721 #endif 722 723 default: 724 bcopy(hp->h_addr, 725 addr.sa.sa_data, 726 hp->h_length); 727 break; 728 } 729 i = 1; 730 } 731 732 /* 733 ** Determine the port number. 734 */ 735 736 if (port != 0) 737 port = htons(port); 738 else 739 { 740 register struct servent *sp = getservbyname("smtp", "tcp"); 741 742 if (sp == NULL) 743 { 744 syserr("554 makeconnection: service \"smtp\" unknown"); 745 port = htons(25); 746 } 747 else 748 port = sp->s_port; 749 } 750 751 switch (addr.sa.sa_family) 752 { 753 #ifdef NETINET 754 case AF_INET: 755 addr.sin.sin_port = port; 756 addrlen = sizeof (struct sockaddr_in); 757 break; 758 #endif 759 760 #ifdef NETISO 761 case AF_ISO: 762 /* assume two byte transport selector */ 763 bcopy((char *) &port, TSEL((struct sockaddr_iso *) &addr), 2); 764 addrlen = sizeof (struct sockaddr_iso); 765 break; 766 #endif 767 768 default: 769 syserr("Can't connect to address family %d", addr.sa.sa_family); 770 return (EX_NOHOST); 771 } 772 773 /* 774 ** Try to actually open the connection. 775 */ 776 777 #ifdef XLA 778 /* if too many connections, don't bother trying */ 779 if (!xla_noqueue_ok(host)) 780 return EX_TEMPFAIL; 781 #endif 782 783 firstconnect = TRUE; 784 for (;;) 785 { 786 if (tTd(16, 1)) 787 printf("makeconnection (%s [%s])\n", 788 host, anynet_ntoa(&addr)); 789 790 /* save for logging */ 791 CurHostAddr = addr; 792 793 if (usesecureport) 794 { 795 int rport = IPPORT_RESERVED - 1; 796 797 s = rresvport(&rport); 798 } 799 else 800 { 801 s = socket(AF_INET, SOCK_STREAM, 0); 802 } 803 if (s < 0) 804 { 805 sav_errno = errno; 806 syserr("makeconnection: no socket"); 807 goto failure; 808 } 809 810 #ifdef SO_SNDBUF 811 if (TcpSndBufferSize > 0) 812 { 813 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, 814 (char *) &TcpSndBufferSize, 815 sizeof(TcpSndBufferSize)) < 0) 816 syserr("makeconnection: setsockopt(SO_SNDBUF)"); 817 } 818 #endif 819 820 if (tTd(16, 1)) 821 printf("makeconnection: fd=%d\n", s); 822 823 /* turn on network debugging? */ 824 if (tTd(16, 101)) 825 { 826 int on = 1; 827 (void) setsockopt(s, SOL_SOCKET, SO_DEBUG, 828 (char *)&on, sizeof on); 829 } 830 if (CurEnv->e_xfp != NULL) 831 (void) fflush(CurEnv->e_xfp); /* for debugging */ 832 errno = 0; /* for debugging */ 833 if (connect(s, (struct sockaddr *) &addr, addrlen) >= 0) 834 break; 835 836 /* if running demand-dialed connection, try again */ 837 if (DialDelay > 0 && firstconnect) 838 { 839 if (tTd(16, 1)) 840 printf("Connect failed (%s); trying again...\n", 841 errstring(sav_errno)); 842 firstconnect = FALSE; 843 sleep(DialDelay); 844 continue; 845 } 846 847 /* couldn't connect.... figure out why */ 848 sav_errno = errno; 849 (void) close(s); 850 if (hp && hp->h_addr_list[i]) 851 { 852 if (tTd(16, 1)) 853 printf("Connect failed (%s); trying new address....\n", 854 errstring(sav_errno)); 855 switch (addr.sa.sa_family) 856 { 857 #ifdef NETINET 858 case AF_INET: 859 bcopy(hp->h_addr_list[i++], 860 &addr.sin.sin_addr, 861 INADDRSZ); 862 break; 863 #endif 864 865 default: 866 bcopy(hp->h_addr_list[i++], 867 addr.sa.sa_data, 868 hp->h_length); 869 break; 870 } 871 continue; 872 } 873 874 /* failure, decide if temporary or not */ 875 failure: 876 #ifdef XLA 877 xla_host_end(host); 878 #endif 879 if (transienterror(sav_errno)) 880 return EX_TEMPFAIL; 881 else 882 { 883 message("%s", errstring(sav_errno)); 884 return (EX_UNAVAILABLE); 885 } 886 } 887 888 /* connection ok, put it into canonical form */ 889 if ((mci->mci_out = fdopen(s, "w")) == NULL || 890 (s = dup(s)) < 0 || 891 (mci->mci_in = fdopen(s, "r")) == NULL) 892 { 893 syserr("cannot open SMTP client channel, fd=%d", s); 894 return EX_TEMPFAIL; 895 } 896 897 return (EX_OK); 898 } 899 /* 900 ** MYHOSTNAME -- return the name of this host. 901 ** 902 ** Parameters: 903 ** hostbuf -- a place to return the name of this host. 904 ** size -- the size of hostbuf. 905 ** 906 ** Returns: 907 ** A list of aliases for this host. 908 ** 909 ** Side Effects: 910 ** Adds numeric codes to $=w. 911 */ 912 913 struct hostent * 914 myhostname(hostbuf, size) 915 char hostbuf[]; 916 int size; 917 { 918 register struct hostent *hp; 919 extern struct hostent *gethostbyname(); 920 extern bool getcanonname(); 921 extern int h_errno; 922 923 if (gethostname(hostbuf, size) < 0) 924 { 925 (void) strcpy(hostbuf, "localhost"); 926 } 927 hp = gethostbyname(hostbuf); 928 if (hp == NULL) 929 return NULL; 930 if (strchr(hp->h_name, '.') != NULL || strchr(hostbuf, '.') == NULL) 931 { 932 (void) strncpy(hostbuf, hp->h_name, size - 1); 933 hostbuf[size - 1] = '\0'; 934 } 935 936 #if NAMED_BIND 937 /* 938 ** If still no dot, try DNS directly (i.e., avoid NIS problems). 939 ** This ought to be driven from the configuration file, but 940 ** we are called before the configuration is read. We could 941 ** check for an /etc/resolv.conf file, but that isn't required. 942 ** All in all, a bit of a mess. 943 */ 944 945 if (strchr(hostbuf, '.') == NULL && 946 !getcanonname(hostbuf, size, TRUE) && 947 h_errno == TRY_AGAIN) 948 { 949 struct stat stbuf; 950 951 /* try twice in case name server not yet started up */ 952 message("My unqualifed host name (%s) unknown to DNS; sleeping for retry", 953 hostbuf); 954 sleep(60); 955 if (!getcanonname(hostbuf, size, TRUE)) 956 errno = h_errno + E_DNSBASE; 957 } 958 #endif 959 return (hp); 960 } 961 /* 962 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 963 ** 964 ** Uses RFC1413 protocol to try to get info from the other end. 965 ** 966 ** Parameters: 967 ** fd -- the descriptor 968 ** 969 ** Returns: 970 ** The user@host information associated with this descriptor. 971 */ 972 973 static jmp_buf CtxAuthTimeout; 974 975 static 976 authtimeout() 977 { 978 longjmp(CtxAuthTimeout, 1); 979 } 980 981 char * 982 getauthinfo(fd) 983 int fd; 984 { 985 int falen; 986 register char *p; 987 SOCKADDR la; 988 int lalen; 989 register struct servent *sp; 990 int s; 991 int i; 992 EVENT *ev; 993 static char hbuf[MAXNAME * 2 + 2]; 994 extern char *hostnamebyanyaddr(); 995 extern char RealUserName[]; /* main.c */ 996 997 falen = sizeof RealHostAddr; 998 if (isatty(fd) || getpeername(fd, &RealHostAddr.sa, &falen) < 0 || 999 falen <= 0 || RealHostAddr.sa.sa_family == 0) 1000 { 1001 (void) sprintf(hbuf, "%s@localhost", RealUserName); 1002 if (tTd(9, 1)) 1003 printf("getauthinfo: %s\n", hbuf); 1004 return hbuf; 1005 } 1006 1007 if (RealHostName == NULL) 1008 { 1009 /* translate that to a host name */ 1010 RealHostName = newstr(hostnamebyanyaddr(&RealHostAddr)); 1011 } 1012 1013 if (TimeOuts.to_ident == 0) 1014 goto noident; 1015 1016 lalen = sizeof la; 1017 if (RealHostAddr.sa.sa_family != AF_INET || 1018 getsockname(fd, &la.sa, &lalen) < 0 || lalen <= 0 || 1019 la.sa.sa_family != AF_INET) 1020 { 1021 /* no ident info */ 1022 goto noident; 1023 } 1024 1025 /* create ident query */ 1026 (void) sprintf(hbuf, "%d,%d\r\n", 1027 ntohs(RealHostAddr.sin.sin_port), ntohs(la.sin.sin_port)); 1028 1029 /* create local address */ 1030 la.sin.sin_port = 0; 1031 1032 /* create foreign address */ 1033 sp = getservbyname("auth", "tcp"); 1034 if (sp != NULL) 1035 RealHostAddr.sin.sin_port = sp->s_port; 1036 else 1037 RealHostAddr.sin.sin_port = htons(113); 1038 1039 s = -1; 1040 if (setjmp(CtxAuthTimeout) != 0) 1041 { 1042 if (s >= 0) 1043 (void) close(s); 1044 goto noident; 1045 } 1046 1047 /* put a timeout around the whole thing */ 1048 ev = setevent(TimeOuts.to_ident, authtimeout, 0); 1049 1050 /* connect to foreign IDENT server using same address as SMTP socket */ 1051 s = socket(AF_INET, SOCK_STREAM, 0); 1052 if (s < 0) 1053 { 1054 clrevent(ev); 1055 goto noident; 1056 } 1057 if (bind(s, &la.sa, sizeof la.sin) < 0 || 1058 connect(s, &RealHostAddr.sa, sizeof RealHostAddr.sin) < 0) 1059 { 1060 goto closeident; 1061 } 1062 1063 if (tTd(9, 10)) 1064 printf("getauthinfo: sent %s", hbuf); 1065 1066 /* send query */ 1067 if (write(s, hbuf, strlen(hbuf)) < 0) 1068 goto closeident; 1069 1070 /* get result */ 1071 i = read(s, hbuf, sizeof hbuf); 1072 (void) close(s); 1073 clrevent(ev); 1074 if (i <= 0) 1075 goto noident; 1076 if (hbuf[--i] == '\n' && hbuf[--i] == '\r') 1077 i--; 1078 hbuf[++i] = '\0'; 1079 1080 if (tTd(9, 3)) 1081 printf("getauthinfo: got %s\n", hbuf); 1082 1083 /* parse result */ 1084 p = strchr(hbuf, ':'); 1085 if (p == NULL) 1086 { 1087 /* malformed response */ 1088 goto noident; 1089 } 1090 while (isascii(*++p) && isspace(*p)) 1091 continue; 1092 if (strncasecmp(p, "userid", 6) != 0) 1093 { 1094 /* presumably an error string */ 1095 goto noident; 1096 } 1097 p += 6; 1098 while (isascii(*p) && isspace(*p)) 1099 p++; 1100 if (*p++ != ':') 1101 { 1102 /* either useridxx or malformed response */ 1103 goto noident; 1104 } 1105 1106 /* p now points to the OSTYPE field */ 1107 p = strchr(p, ':'); 1108 if (p == NULL) 1109 { 1110 /* malformed response */ 1111 goto noident; 1112 } 1113 1114 /* 1413 says don't do this -- but it's broken otherwise */ 1115 while (isascii(*++p) && isspace(*p)) 1116 continue; 1117 1118 /* p now points to the authenticated name -- copy carefully */ 1119 for (i = 0; i < MAXNAME && *p != '\0'; p++) 1120 { 1121 if (isascii(*p) && 1122 (isalnum(*p) || strchr("!#$%&'*+-./^_`{|}~", *p) != NULL)) 1123 hbuf[i++] = *p; 1124 } 1125 hbuf[i++] = '@'; 1126 strcpy(&hbuf[i], RealHostName == NULL ? "localhost" : RealHostName); 1127 goto finish; 1128 1129 closeident: 1130 (void) close(s); 1131 clrevent(ev); 1132 1133 noident: 1134 if (RealHostName == NULL) 1135 { 1136 if (tTd(9, 1)) 1137 printf("getauthinfo: NULL\n"); 1138 return NULL; 1139 } 1140 (void) strcpy(hbuf, RealHostName); 1141 1142 finish: 1143 if (RealHostName != NULL && RealHostName[0] != '[') 1144 { 1145 p = &hbuf[strlen(hbuf)]; 1146 (void) sprintf(p, " [%s]", anynet_ntoa(&RealHostAddr)); 1147 } 1148 if (tTd(9, 1)) 1149 printf("getauthinfo: %s\n", hbuf); 1150 return hbuf; 1151 } 1152 /* 1153 ** HOST_MAP_LOOKUP -- turn a hostname into canonical form 1154 ** 1155 ** Parameters: 1156 ** map -- a pointer to this map (unused). 1157 ** name -- the (presumably unqualified) hostname. 1158 ** av -- unused -- for compatibility with other mapping 1159 ** functions. 1160 ** statp -- an exit status (out parameter) -- set to 1161 ** EX_TEMPFAIL if the name server is unavailable. 1162 ** 1163 ** Returns: 1164 ** The mapping, if found. 1165 ** NULL if no mapping found. 1166 ** 1167 ** Side Effects: 1168 ** Looks up the host specified in hbuf. If it is not 1169 ** the canonical name for that host, return the canonical 1170 ** name. 1171 */ 1172 1173 char * 1174 host_map_lookup(map, name, av, statp) 1175 MAP *map; 1176 char *name; 1177 char **av; 1178 int *statp; 1179 { 1180 register struct hostent *hp; 1181 struct in_addr in_addr; 1182 char *cp; 1183 int i; 1184 register STAB *s; 1185 char hbuf[MAXNAME]; 1186 extern struct hostent *gethostbyaddr(); 1187 #if NAMED_BIND 1188 extern int h_errno; 1189 #endif 1190 1191 /* 1192 ** See if we have already looked up this name. If so, just 1193 ** return it. 1194 */ 1195 1196 s = stab(name, ST_NAMECANON, ST_ENTER); 1197 if (bitset(NCF_VALID, s->s_namecanon.nc_flags)) 1198 { 1199 if (tTd(9, 1)) 1200 printf("host_map_lookup(%s) => CACHE %s\n", 1201 name, s->s_namecanon.nc_cname); 1202 errno = s->s_namecanon.nc_errno; 1203 #if NAMED_BIND 1204 h_errno = s->s_namecanon.nc_herrno; 1205 #endif 1206 *statp = s->s_namecanon.nc_stat; 1207 if (CurEnv->e_message == NULL && *statp == EX_TEMPFAIL) 1208 { 1209 sprintf(hbuf, "%s: Name server timeout", 1210 shortenstring(name, 33)); 1211 CurEnv->e_message = newstr(hbuf); 1212 } 1213 return s->s_namecanon.nc_cname; 1214 } 1215 1216 /* 1217 ** If first character is a bracket, then it is an address 1218 ** lookup. Address is copied into a temporary buffer to 1219 ** strip the brackets and to preserve name if address is 1220 ** unknown. 1221 */ 1222 1223 if (*name != '[') 1224 { 1225 extern bool getcanonname(); 1226 1227 if (tTd(9, 1)) 1228 printf("host_map_lookup(%s) => ", name); 1229 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1230 (void) strcpy(hbuf, name); 1231 if (getcanonname(hbuf, sizeof hbuf - 1, TRUE)) 1232 { 1233 if (tTd(9, 1)) 1234 printf("%s\n", hbuf); 1235 cp = map_rewrite(map, hbuf, strlen(hbuf), av); 1236 s->s_namecanon.nc_cname = newstr(cp); 1237 return cp; 1238 } 1239 else 1240 { 1241 register struct hostent *hp; 1242 1243 s->s_namecanon.nc_errno = errno; 1244 #if NAMED_BIND 1245 s->s_namecanon.nc_herrno = h_errno; 1246 if (tTd(9, 1)) 1247 printf("FAIL (%d)\n", h_errno); 1248 switch (h_errno) 1249 { 1250 case TRY_AGAIN: 1251 if (UseNameServer) 1252 { 1253 sprintf(hbuf, "%s: Name server timeout", 1254 shortenstring(name, 33)); 1255 message("%s", hbuf); 1256 if (CurEnv->e_message == NULL) 1257 CurEnv->e_message = newstr(hbuf); 1258 } 1259 *statp = EX_TEMPFAIL; 1260 break; 1261 1262 case HOST_NOT_FOUND: 1263 *statp = EX_NOHOST; 1264 break; 1265 1266 case NO_RECOVERY: 1267 *statp = EX_SOFTWARE; 1268 break; 1269 1270 default: 1271 *statp = EX_UNAVAILABLE; 1272 break; 1273 } 1274 #else 1275 if (tTd(9, 1)) 1276 printf("FAIL\n"); 1277 *statp = EX_NOHOST; 1278 #endif 1279 s->s_namecanon.nc_stat = *statp; 1280 if ((*statp != EX_TEMPFAIL && *statp != EX_NOHOST) || 1281 UseNameServer) 1282 return NULL; 1283 1284 /* 1285 ** Try to look it up in /etc/hosts 1286 */ 1287 1288 hp = gethostbyname(name); 1289 if (hp == NULL) 1290 { 1291 /* no dice there either */ 1292 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1293 return NULL; 1294 } 1295 1296 s->s_namecanon.nc_stat = *statp = EX_OK; 1297 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1298 s->s_namecanon.nc_cname = newstr(cp); 1299 return cp; 1300 } 1301 } 1302 if ((cp = strchr(name, ']')) == NULL) 1303 return (NULL); 1304 *cp = '\0'; 1305 in_addr.s_addr = inet_addr(&name[1]); 1306 1307 /* nope -- ask the name server */ 1308 hp = gethostbyaddr((char *)&in_addr, INADDRSZ, AF_INET); 1309 s->s_namecanon.nc_errno = errno; 1310 #if NAMED_BIND 1311 s->s_namecanon.nc_herrno = h_errno; 1312 #endif 1313 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1314 if (hp == NULL) 1315 { 1316 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1317 return (NULL); 1318 } 1319 1320 /* found a match -- copy out */ 1321 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1322 s->s_namecanon.nc_stat = *statp = EX_OK; 1323 s->s_namecanon.nc_cname = newstr(cp); 1324 return cp; 1325 } 1326 /* 1327 ** ANYNET_NTOA -- convert a network address to printable form. 1328 ** 1329 ** Parameters: 1330 ** sap -- a pointer to a sockaddr structure. 1331 ** 1332 ** Returns: 1333 ** A printable version of that sockaddr. 1334 */ 1335 1336 char * 1337 anynet_ntoa(sap) 1338 register SOCKADDR *sap; 1339 { 1340 register char *bp; 1341 register char *ap; 1342 int l; 1343 static char buf[100]; 1344 1345 /* check for null/zero family */ 1346 if (sap == NULL) 1347 return "NULLADDR"; 1348 if (sap->sa.sa_family == 0) 1349 return "0"; 1350 1351 switch (sap->sa.sa_family) 1352 { 1353 #ifdef NETUNIX 1354 case AF_UNIX: 1355 if (sap->sunix.sun_path[0] != '\0') 1356 sprintf(buf, "[UNIX: %.64s]", sap->sunix.sun_path); 1357 else 1358 sprintf(buf, "[UNIX: localhost]"); 1359 return buf; 1360 #endif 1361 1362 #ifdef NETINET 1363 case AF_INET: 1364 return inet_ntoa(((struct sockaddr_in *) sap)->sin_addr); 1365 #endif 1366 1367 default: 1368 /* this case is only to ensure syntactic correctness */ 1369 break; 1370 } 1371 1372 /* unknown family -- just dump bytes */ 1373 (void) sprintf(buf, "Family %d: ", sap->sa.sa_family); 1374 bp = &buf[strlen(buf)]; 1375 ap = sap->sa.sa_data; 1376 for (l = sizeof sap->sa.sa_data; --l >= 0; ) 1377 { 1378 (void) sprintf(bp, "%02x:", *ap++ & 0377); 1379 bp += 3; 1380 } 1381 *--bp = '\0'; 1382 return buf; 1383 } 1384 /* 1385 ** HOSTNAMEBYANYADDR -- return name of host based on address 1386 ** 1387 ** Parameters: 1388 ** sap -- SOCKADDR pointer 1389 ** 1390 ** Returns: 1391 ** text representation of host name. 1392 ** 1393 ** Side Effects: 1394 ** none. 1395 */ 1396 1397 char * 1398 hostnamebyanyaddr(sap) 1399 register SOCKADDR *sap; 1400 { 1401 register struct hostent *hp; 1402 int saveretry; 1403 1404 #if NAMED_BIND 1405 /* shorten name server timeout to avoid higher level timeouts */ 1406 saveretry = _res.retry; 1407 _res.retry = 3; 1408 #endif /* NAMED_BIND */ 1409 1410 switch (sap->sa.sa_family) 1411 { 1412 #ifdef NETINET 1413 case AF_INET: 1414 hp = gethostbyaddr((char *) &sap->sin.sin_addr, 1415 INADDRSZ, 1416 AF_INET); 1417 break; 1418 #endif 1419 1420 #ifdef NETISO 1421 case AF_ISO: 1422 hp = gethostbyaddr((char *) &sap->siso.siso_addr, 1423 sizeof sap->siso.siso_addr, 1424 AF_ISO); 1425 break; 1426 #endif 1427 1428 case AF_UNIX: 1429 hp = NULL; 1430 break; 1431 1432 default: 1433 hp = gethostbyaddr(sap->sa.sa_data, 1434 sizeof sap->sa.sa_data, 1435 sap->sa.sa_family); 1436 break; 1437 } 1438 1439 #if NAMED_BIND 1440 _res.retry = saveretry; 1441 #endif /* NAMED_BIND */ 1442 1443 if (hp != NULL) 1444 return hp->h_name; 1445 else 1446 { 1447 /* produce a dotted quad */ 1448 static char buf[512]; 1449 1450 (void) sprintf(buf, "[%s]", anynet_ntoa(sap)); 1451 return buf; 1452 } 1453 } 1454 1455 # else /* DAEMON */ 1456 /* code for systems without sophisticated networking */ 1457 1458 /* 1459 ** MYHOSTNAME -- stub version for case of no daemon code. 1460 ** 1461 ** Can't convert to upper case here because might be a UUCP name. 1462 ** 1463 ** Mark, you can change this to be anything you want...... 1464 */ 1465 1466 char ** 1467 myhostname(hostbuf, size) 1468 char hostbuf[]; 1469 int size; 1470 { 1471 register FILE *f; 1472 1473 hostbuf[0] = '\0'; 1474 f = fopen("/usr/include/whoami", "r"); 1475 if (f != NULL) 1476 { 1477 (void) fgets(hostbuf, size, f); 1478 fixcrlf(hostbuf, TRUE); 1479 (void) fclose(f); 1480 } 1481 return (NULL); 1482 } 1483 /* 1484 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 1485 ** 1486 ** Parameters: 1487 ** fd -- the descriptor 1488 ** 1489 ** Returns: 1490 ** The host name associated with this descriptor, if it can 1491 ** be determined. 1492 ** NULL otherwise. 1493 ** 1494 ** Side Effects: 1495 ** none 1496 */ 1497 1498 char * 1499 getauthinfo(fd) 1500 int fd; 1501 { 1502 return NULL; 1503 } 1504 /* 1505 ** MAPHOSTNAME -- turn a hostname into canonical form 1506 ** 1507 ** Parameters: 1508 ** map -- a pointer to the database map. 1509 ** name -- a buffer containing a hostname. 1510 ** avp -- a pointer to a (cf file defined) argument vector. 1511 ** statp -- an exit status (out parameter). 1512 ** 1513 ** Returns: 1514 ** mapped host name 1515 ** FALSE otherwise. 1516 ** 1517 ** Side Effects: 1518 ** Looks up the host specified in name. If it is not 1519 ** the canonical name for that host, replace it with 1520 ** the canonical name. If the name is unknown, or it 1521 ** is already the canonical name, leave it unchanged. 1522 */ 1523 1524 /*ARGSUSED*/ 1525 char * 1526 host_map_lookup(map, name, avp, statp) 1527 MAP *map; 1528 char *name; 1529 char **avp; 1530 char *statp; 1531 { 1532 register struct hostent *hp; 1533 1534 hp = gethostbyname(name); 1535 if (hp != NULL) 1536 return hp->h_name; 1537 *statp = EX_NOHOST; 1538 return NULL; 1539 } 1540 1541 #endif /* DAEMON */ 1542