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 8.33 (Berkeley) 02/05/94 (with daemon mode)"; 15 #else 16 static char sccsid[] = "@(#)daemon.c 8.33 (Berkeley) 02/05/94 (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 #ifdef NAMED_BIND 26 # include <arpa/nameser.h> 27 # include <resolv.h> 28 #endif 29 30 /* 31 ** DAEMON.C -- routines to use when running as a daemon. 32 ** 33 ** This entire file is highly dependent on the 4.2 BSD 34 ** interprocess communication primitives. No attempt has 35 ** been made to make this file portable to Version 7, 36 ** Version 6, MPX files, etc. If you should try such a 37 ** thing yourself, I recommend chucking the entire file 38 ** and starting from scratch. Basic semantics are: 39 ** 40 ** getrequests() 41 ** Opens a port and initiates a connection. 42 ** Returns in a child. Must set InChannel and 43 ** OutChannel appropriately. 44 ** clrdaemon() 45 ** Close any open files associated with getting 46 ** the connection; this is used when running the queue, 47 ** etc., to avoid having extra file descriptors during 48 ** the queue run and to avoid confusing the network 49 ** code (if it cares). 50 ** makeconnection(host, port, outfile, infile, usesecureport) 51 ** Make a connection to the named host on the given 52 ** port. Set *outfile and *infile to the files 53 ** appropriate for communication. Returns zero on 54 ** success, else an exit status describing the 55 ** error. 56 ** host_map_lookup(map, hbuf, avp, pstat) 57 ** Convert the entry in hbuf into a canonical form. 58 */ 59 /* 60 ** GETREQUESTS -- open mail IPC port and get requests. 61 ** 62 ** Parameters: 63 ** none. 64 ** 65 ** Returns: 66 ** none. 67 ** 68 ** Side Effects: 69 ** Waits until some interesting activity occurs. When 70 ** it does, a child is created to process it, and the 71 ** parent waits for completion. Return from this 72 ** routine is always in the child. The file pointers 73 ** "InChannel" and "OutChannel" should be set to point 74 ** to the communication channel. 75 */ 76 77 int DaemonSocket = -1; /* fd describing socket */ 78 SOCKADDR DaemonAddr; /* socket for incoming */ 79 int ListenQueueSize = 10; /* size of listen queue */ 80 int TcpRcvBufferSize = 0; /* size of TCP receive buffer */ 81 int TcpSndBufferSize = 0; /* size of TCP send buffer */ 82 83 getrequests() 84 { 85 int t; 86 int on = 1; 87 bool refusingconnections = TRUE; 88 FILE *pidf; 89 int socksize; 90 extern void reapchild(); 91 92 /* 93 ** Set up the address for the mailer. 94 */ 95 96 if (DaemonAddr.sin.sin_family == 0) 97 DaemonAddr.sin.sin_family = AF_INET; 98 if (DaemonAddr.sin.sin_addr.s_addr == 0) 99 DaemonAddr.sin.sin_addr.s_addr = INADDR_ANY; 100 if (DaemonAddr.sin.sin_port == 0) 101 { 102 register struct servent *sp; 103 104 sp = getservbyname("smtp", "tcp"); 105 if (sp == NULL) 106 { 107 syserr("554 service \"smtp\" unknown"); 108 DaemonAddr.sin.sin_port = htons(25); 109 } 110 else 111 DaemonAddr.sin.sin_port = sp->s_port; 112 } 113 114 /* 115 ** Try to actually open the connection. 116 */ 117 118 if (tTd(15, 1)) 119 printf("getrequests: port 0x%x\n", DaemonAddr.sin.sin_port); 120 121 /* get a socket for the SMTP connection */ 122 DaemonSocket = socket(DaemonAddr.sa.sa_family, SOCK_STREAM, 0); 123 if (DaemonSocket < 0) 124 { 125 /* probably another daemon already */ 126 syserr("getrequests: can't create socket"); 127 severe: 128 # ifdef LOG 129 if (LogLevel > 0) 130 syslog(LOG_ALERT, "problem creating SMTP socket"); 131 # endif /* LOG */ 132 finis(); 133 } 134 135 /* turn on network debugging? */ 136 if (tTd(15, 101)) 137 (void) setsockopt(DaemonSocket, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof on); 138 139 (void) setsockopt(DaemonSocket, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof on); 140 (void) setsockopt(DaemonSocket, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, sizeof on); 141 142 #ifdef SO_RCVBUF 143 if (TcpRcvBufferSize > 0) 144 { 145 if (setsockopt(DaemonSocket, SOL_SOCKET, SO_RCVBUF, 146 (char *) &TcpRcvBufferSize, 147 sizeof(TcpRcvBufferSize)) < 0) 148 syserr("getrequests: setsockopt(SO_RCVBUF)"); 149 } 150 #endif 151 152 switch (DaemonAddr.sa.sa_family) 153 { 154 # ifdef NETINET 155 case AF_INET: 156 socksize = sizeof DaemonAddr.sin; 157 break; 158 # endif 159 160 # ifdef NETISO 161 case AF_ISO: 162 socksize = sizeof DaemonAddr.siso; 163 break; 164 # endif 165 166 default: 167 socksize = sizeof DaemonAddr; 168 break; 169 } 170 171 if (bind(DaemonSocket, &DaemonAddr.sa, socksize) < 0) 172 { 173 syserr("getrequests: cannot bind"); 174 (void) close(DaemonSocket); 175 goto severe; 176 } 177 178 (void) setsignal(SIGCHLD, reapchild); 179 180 /* write the pid to the log file for posterity */ 181 pidf = fopen(PidFile, "w"); 182 if (pidf != NULL) 183 { 184 extern char *CommandLineArgs; 185 186 /* write the process id on line 1 */ 187 fprintf(pidf, "%d\n", getpid()); 188 189 /* line 2 contains all command line flags */ 190 fprintf(pidf, "%s\n", CommandLineArgs); 191 192 /* flush and close */ 193 fclose(pidf); 194 } 195 196 197 if (tTd(15, 1)) 198 printf("getrequests: %d\n", DaemonSocket); 199 200 for (;;) 201 { 202 register int pid; 203 auto int lotherend; 204 extern bool refuseconnections(); 205 206 /* see if we are rejecting connections */ 207 CurrentLA = getla(); 208 if (refuseconnections()) 209 { 210 if (!refusingconnections) 211 { 212 /* don't queue so peer will fail quickly */ 213 (void) listen(DaemonSocket, 0); 214 refusingconnections = TRUE; 215 } 216 setproctitle("rejecting connections: load average: %d", 217 CurrentLA); 218 sleep(5); 219 continue; 220 } 221 222 if (refusingconnections) 223 { 224 /* start listening again */ 225 if (listen(DaemonSocket, ListenQueueSize) < 0) 226 { 227 syserr("getrequests: cannot listen"); 228 (void) close(DaemonSocket); 229 goto severe; 230 } 231 setproctitle("accepting connections"); 232 refusingconnections = FALSE; 233 } 234 235 /* wait for a connection */ 236 do 237 { 238 errno = 0; 239 lotherend = socksize; 240 t = accept(DaemonSocket, 241 (struct sockaddr *)&RealHostAddr, &lotherend); 242 } while (t < 0 && errno == EINTR); 243 if (t < 0) 244 { 245 syserr("getrequests: accept"); 246 sleep(5); 247 continue; 248 } 249 250 /* 251 ** Create a subprocess to process the mail. 252 */ 253 254 if (tTd(15, 2)) 255 printf("getrequests: forking (fd = %d)\n", t); 256 257 pid = fork(); 258 if (pid < 0) 259 { 260 syserr("daemon: cannot fork"); 261 sleep(10); 262 (void) close(t); 263 continue; 264 } 265 266 if (pid == 0) 267 { 268 char *p; 269 extern char *hostnamebyanyaddr(); 270 271 /* 272 ** CHILD -- return to caller. 273 ** Collect verified idea of sending host. 274 ** Verify calling user id if possible here. 275 */ 276 277 (void) setsignal(SIGCHLD, SIG_DFL); 278 279 /* determine host name */ 280 p = hostnamebyanyaddr(&RealHostAddr); 281 RealHostName = newstr(p); 282 283 #ifdef LOG 284 if (LogLevel > 11) 285 { 286 /* log connection information */ 287 syslog(LOG_INFO, "connect from %s (%s)", 288 RealHostName, anynet_ntoa(&RealHostAddr)); 289 } 290 #endif 291 292 (void) close(DaemonSocket); 293 if ((InChannel = fdopen(t, "r")) == NULL || 294 (t = dup(t)) < 0 || 295 (OutChannel = fdopen(t, "w")) == NULL) 296 { 297 syserr("cannot open SMTP server channel, fd=%d", t); 298 exit(0); 299 } 300 301 /* should we check for illegal connection here? XXX */ 302 #ifdef XLA 303 if (!xla_host_ok(RealHostName)) 304 { 305 message("421 Too many SMTP sessions for this host"); 306 exit(0); 307 } 308 #endif 309 310 if (tTd(15, 2)) 311 printf("getreq: returning\n"); 312 return; 313 } 314 315 /* close the port so that others will hang (for a while) */ 316 (void) close(t); 317 } 318 /*NOTREACHED*/ 319 } 320 /* 321 ** CLRDAEMON -- reset the daemon connection 322 ** 323 ** Parameters: 324 ** none. 325 ** 326 ** Returns: 327 ** none. 328 ** 329 ** Side Effects: 330 ** releases any resources used by the passive daemon. 331 */ 332 333 clrdaemon() 334 { 335 if (DaemonSocket >= 0) 336 (void) close(DaemonSocket); 337 DaemonSocket = -1; 338 } 339 /* 340 ** SETDAEMONOPTIONS -- set options for running the daemon 341 ** 342 ** Parameters: 343 ** p -- the options line. 344 ** 345 ** Returns: 346 ** none. 347 */ 348 349 setdaemonoptions(p) 350 register char *p; 351 { 352 if (DaemonAddr.sa.sa_family == AF_UNSPEC) 353 DaemonAddr.sa.sa_family = AF_INET; 354 355 while (p != NULL) 356 { 357 register char *f; 358 register char *v; 359 360 while (isascii(*p) && isspace(*p)) 361 p++; 362 if (*p == '\0') 363 break; 364 f = p; 365 p = strchr(p, ','); 366 if (p != NULL) 367 *p++ = '\0'; 368 v = strchr(f, '='); 369 if (v == NULL) 370 continue; 371 while (isascii(*++v) && isspace(*v)) 372 continue; 373 374 switch (*f) 375 { 376 case 'F': /* address family */ 377 if (isascii(*v) && isdigit(*v)) 378 DaemonAddr.sa.sa_family = atoi(v); 379 #ifdef NETINET 380 else if (strcasecmp(v, "inet") == 0) 381 DaemonAddr.sa.sa_family = AF_INET; 382 #endif 383 #ifdef NETISO 384 else if (strcasecmp(v, "iso") == 0) 385 DaemonAddr.sa.sa_family = AF_ISO; 386 #endif 387 #ifdef NETNS 388 else if (strcasecmp(v, "ns") == 0) 389 DaemonAddr.sa.sa_family = AF_NS; 390 #endif 391 #ifdef NETX25 392 else if (strcasecmp(v, "x.25") == 0) 393 DaemonAddr.sa.sa_family = AF_CCITT; 394 #endif 395 else 396 syserr("554 Unknown address family %s in Family=option", v); 397 break; 398 399 case 'A': /* address */ 400 switch (DaemonAddr.sa.sa_family) 401 { 402 #ifdef NETINET 403 case AF_INET: 404 if (isascii(*v) && isdigit(*v)) 405 DaemonAddr.sin.sin_addr.s_addr = inet_network(v); 406 else 407 { 408 register struct netent *np; 409 410 np = getnetbyname(v); 411 if (np == NULL) 412 syserr("554 network \"%s\" unknown", v); 413 else 414 DaemonAddr.sin.sin_addr.s_addr = np->n_net; 415 } 416 break; 417 #endif 418 419 default: 420 syserr("554 Address= option unsupported for family %d", 421 DaemonAddr.sa.sa_family); 422 break; 423 } 424 break; 425 426 case 'P': /* port */ 427 switch (DaemonAddr.sa.sa_family) 428 { 429 short port; 430 431 #ifdef NETINET 432 case AF_INET: 433 if (isascii(*v) && isdigit(*v)) 434 DaemonAddr.sin.sin_port = htons(atoi(v)); 435 else 436 { 437 register struct servent *sp; 438 439 sp = getservbyname(v, "tcp"); 440 if (sp == NULL) 441 syserr("554 service \"%s\" unknown", v); 442 else 443 DaemonAddr.sin.sin_port = sp->s_port; 444 } 445 break; 446 #endif 447 448 #ifdef NETISO 449 case AF_ISO: 450 /* assume two byte transport selector */ 451 if (isascii(*v) && isdigit(*v)) 452 port = htons(atoi(v)); 453 else 454 { 455 register struct servent *sp; 456 457 sp = getservbyname(v, "tcp"); 458 if (sp == NULL) 459 syserr("554 service \"%s\" unknown", v); 460 else 461 port = sp->s_port; 462 } 463 bcopy((char *) &port, TSEL(&DaemonAddr.siso), 2); 464 break; 465 #endif 466 467 default: 468 syserr("554 Port= option unsupported for family %d", 469 DaemonAddr.sa.sa_family); 470 break; 471 } 472 break; 473 474 case 'L': /* listen queue size */ 475 ListenQueueSize = atoi(v); 476 break; 477 478 case 'S': /* send buffer size */ 479 TcpSndBufferSize = atoi(v); 480 break; 481 482 case 'R': /* receive buffer size */ 483 TcpRcvBufferSize = atoi(v); 484 break; 485 } 486 } 487 } 488 /* 489 ** MAKECONNECTION -- make a connection to an SMTP socket on another machine. 490 ** 491 ** Parameters: 492 ** host -- the name of the host. 493 ** port -- the port number to connect to. 494 ** mci -- a pointer to the mail connection information 495 ** structure to be filled in. 496 ** usesecureport -- if set, use a low numbered (reserved) 497 ** port to provide some rudimentary authentication. 498 ** 499 ** Returns: 500 ** An exit code telling whether the connection could be 501 ** made and if not why not. 502 ** 503 ** Side Effects: 504 ** none. 505 */ 506 507 SOCKADDR CurHostAddr; /* address of current host */ 508 509 int 510 makeconnection(host, port, mci, usesecureport) 511 char *host; 512 u_short port; 513 register MCI *mci; 514 bool usesecureport; 515 { 516 register int i, s; 517 register struct hostent *hp = (struct hostent *)NULL; 518 SOCKADDR addr; 519 int sav_errno; 520 int addrlen; 521 #ifdef NAMED_BIND 522 extern int h_errno; 523 #endif 524 525 /* 526 ** Set up the address for the mailer. 527 ** Accept "[a.b.c.d]" syntax for host name. 528 */ 529 530 #ifdef NAMED_BIND 531 h_errno = 0; 532 #endif 533 errno = 0; 534 bzero(&CurHostAddr, sizeof CurHostAddr); 535 SmtpPhase = mci->mci_phase = "initial connection"; 536 CurHostName = host; 537 538 if (host[0] == '[') 539 { 540 long hid; 541 register char *p = strchr(host, ']'); 542 543 if (p != NULL) 544 { 545 *p = '\0'; 546 #ifdef NETINET 547 hid = inet_addr(&host[1]); 548 if (hid == -1) 549 #endif 550 { 551 /* try it as a host name (avoid MX lookup) */ 552 hp = gethostbyname(&host[1]); 553 *p = ']'; 554 goto gothostent; 555 } 556 *p = ']'; 557 } 558 if (p == NULL) 559 { 560 usrerr("553 Invalid numeric domain spec \"%s\"", host); 561 return (EX_NOHOST); 562 } 563 #ifdef NETINET 564 addr.sin.sin_family = AF_INET; /*XXX*/ 565 addr.sin.sin_addr.s_addr = hid; 566 #endif 567 } 568 else 569 { 570 hp = gethostbyname(host); 571 gothostent: 572 if (hp == NULL) 573 { 574 #ifdef NAMED_BIND 575 if (errno == ETIMEDOUT || h_errno == TRY_AGAIN) 576 return (EX_TEMPFAIL); 577 578 /* if name server is specified, assume temp fail */ 579 if (errno == ECONNREFUSED && UseNameServer) 580 return (EX_TEMPFAIL); 581 #endif 582 return (EX_NOHOST); 583 } 584 addr.sa.sa_family = hp->h_addrtype; 585 switch (hp->h_addrtype) 586 { 587 #ifdef NETINET 588 case AF_INET: 589 bcopy(hp->h_addr, 590 &addr.sin.sin_addr, 591 sizeof addr.sin.sin_addr); 592 break; 593 #endif 594 595 default: 596 bcopy(hp->h_addr, 597 addr.sa.sa_data, 598 hp->h_length); 599 break; 600 } 601 i = 1; 602 } 603 604 /* 605 ** Determine the port number. 606 */ 607 608 if (port != 0) 609 port = htons(port); 610 else 611 { 612 register struct servent *sp = getservbyname("smtp", "tcp"); 613 614 if (sp == NULL) 615 { 616 syserr("554 makeconnection: service \"smtp\" unknown"); 617 port = htons(25); 618 } 619 else 620 port = sp->s_port; 621 } 622 623 switch (addr.sa.sa_family) 624 { 625 #ifdef NETINET 626 case AF_INET: 627 addr.sin.sin_port = port; 628 addrlen = sizeof (struct sockaddr_in); 629 break; 630 #endif 631 632 #ifdef NETISO 633 case AF_ISO: 634 /* assume two byte transport selector */ 635 bcopy((char *) &port, TSEL((struct sockaddr_iso *) &addr), 2); 636 addrlen = sizeof (struct sockaddr_iso); 637 break; 638 #endif 639 640 default: 641 syserr("Can't connect to address family %d", addr.sa.sa_family); 642 return (EX_NOHOST); 643 } 644 645 /* 646 ** Try to actually open the connection. 647 */ 648 649 #ifdef XLA 650 /* if too many connections, don't bother trying */ 651 if (!xla_noqueue_ok(host)) 652 return EX_TEMPFAIL; 653 #endif 654 655 for (;;) 656 { 657 if (tTd(16, 1)) 658 printf("makeconnection (%s [%s])\n", 659 host, anynet_ntoa(&addr)); 660 661 /* save for logging */ 662 CurHostAddr = addr; 663 664 if (usesecureport) 665 { 666 int rport = IPPORT_RESERVED - 1; 667 668 s = rresvport(&rport); 669 } 670 else 671 { 672 s = socket(AF_INET, SOCK_STREAM, 0); 673 } 674 if (s < 0) 675 { 676 sav_errno = errno; 677 syserr("makeconnection: no socket"); 678 goto failure; 679 } 680 681 #ifdef SO_SNDBUF 682 if (TcpSndBufferSize > 0) 683 { 684 if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, 685 (char *) &TcpSndBufferSize, 686 sizeof(TcpSndBufferSize)) < 0) 687 syserr("makeconnection: setsockopt(SO_SNDBUF)"); 688 } 689 #endif 690 691 if (tTd(16, 1)) 692 printf("makeconnection: fd=%d\n", s); 693 694 /* turn on network debugging? */ 695 if (tTd(16, 101)) 696 { 697 int on = 1; 698 (void) setsockopt(DaemonSocket, SOL_SOCKET, SO_DEBUG, 699 (char *)&on, sizeof on); 700 } 701 if (CurEnv->e_xfp != NULL) 702 (void) fflush(CurEnv->e_xfp); /* for debugging */ 703 errno = 0; /* for debugging */ 704 if (connect(s, (struct sockaddr *) &addr, addrlen) >= 0) 705 break; 706 707 /* couldn't connect.... figure out why */ 708 sav_errno = errno; 709 (void) close(s); 710 if (hp && hp->h_addr_list[i]) 711 { 712 if (tTd(16, 1)) 713 printf("Connect failed (%s); trying new address....\n", 714 errstring(sav_errno)); 715 switch (addr.sa.sa_family) 716 { 717 #ifdef NETINET 718 case AF_INET: 719 bcopy(hp->h_addr_list[i++], 720 &addr.sin.sin_addr, 721 sizeof addr.sin.sin_addr); 722 break; 723 #endif 724 725 default: 726 bcopy(hp->h_addr_list[i++], 727 addr.sa.sa_data, 728 hp->h_length); 729 break; 730 } 731 continue; 732 } 733 734 /* failure, decide if temporary or not */ 735 failure: 736 #ifdef XLA 737 xla_host_end(host); 738 #endif 739 if (transienterror(sav_errno)) 740 return EX_TEMPFAIL; 741 else 742 { 743 message("%s", errstring(sav_errno)); 744 return (EX_UNAVAILABLE); 745 } 746 } 747 748 /* connection ok, put it into canonical form */ 749 if ((mci->mci_out = fdopen(s, "w")) == NULL || 750 (s = dup(s)) < 0 || 751 (mci->mci_in = fdopen(s, "r")) == NULL) 752 { 753 syserr("cannot open SMTP client channel, fd=%d", s); 754 return EX_TEMPFAIL; 755 } 756 757 return (EX_OK); 758 } 759 /* 760 ** MYHOSTNAME -- return the name of this host. 761 ** 762 ** Parameters: 763 ** hostbuf -- a place to return the name of this host. 764 ** size -- the size of hostbuf. 765 ** 766 ** Returns: 767 ** A list of aliases for this host. 768 ** 769 ** Side Effects: 770 ** Adds numeric codes to $=w. 771 */ 772 773 char ** 774 myhostname(hostbuf, size) 775 char hostbuf[]; 776 int size; 777 { 778 register struct hostent *hp; 779 extern struct hostent *gethostbyname(); 780 781 if (gethostname(hostbuf, size) < 0) 782 { 783 (void) strcpy(hostbuf, "localhost"); 784 } 785 hp = gethostbyname(hostbuf); 786 if (hp != NULL) 787 { 788 (void) strncpy(hostbuf, hp->h_name, size - 1); 789 hostbuf[size - 1] = '\0'; 790 791 if (hp->h_addrtype == AF_INET && hp->h_length == 4) 792 { 793 register int i; 794 795 for (i = 0; hp->h_addr_list[i] != NULL; i++) 796 { 797 char ipbuf[100]; 798 799 sprintf(ipbuf, "[%s]", 800 inet_ntoa(*((struct in_addr *) hp->h_addr_list[i]))); 801 setclass('w', ipbuf); 802 } 803 } 804 805 return (hp->h_aliases); 806 } 807 else 808 return (NULL); 809 } 810 /* 811 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 812 ** 813 ** Uses RFC1413 protocol to try to get info from the other end. 814 ** 815 ** Parameters: 816 ** fd -- the descriptor 817 ** 818 ** Returns: 819 ** The user@host information associated with this descriptor. 820 */ 821 822 #if IDENTPROTO 823 824 static jmp_buf CtxAuthTimeout; 825 826 static 827 authtimeout() 828 { 829 longjmp(CtxAuthTimeout, 1); 830 } 831 832 #endif 833 834 char * 835 getauthinfo(fd) 836 int fd; 837 { 838 SOCKADDR fa; 839 int falen; 840 register char *p; 841 #if IDENTPROTO 842 SOCKADDR la; 843 int lalen; 844 register struct servent *sp; 845 int s; 846 int i; 847 EVENT *ev; 848 #endif 849 static char hbuf[MAXNAME * 2 + 2]; 850 extern char *hostnamebyanyaddr(); 851 extern char RealUserName[]; /* main.c */ 852 853 falen = sizeof fa; 854 if (getpeername(fd, &fa.sa, &falen) < 0 || falen <= 0 || 855 fa.sa.sa_family == 0) 856 { 857 (void) sprintf(hbuf, "%s@localhost", RealUserName); 858 if (tTd(9, 1)) 859 printf("getauthinfo: %s\n", hbuf); 860 return hbuf; 861 } 862 863 #if IDENTPROTO 864 if (TimeOuts.to_ident == 0) 865 goto noident; 866 867 lalen = sizeof la; 868 if (fa.sa.sa_family != AF_INET || 869 getsockname(fd, &la.sa, &lalen) < 0 || lalen <= 0 || 870 la.sa.sa_family != AF_INET) 871 { 872 /* no ident info */ 873 goto noident; 874 } 875 876 /* create ident query */ 877 (void) sprintf(hbuf, "%d,%d\r\n", 878 ntohs(fa.sin.sin_port), ntohs(la.sin.sin_port)); 879 880 /* create local address */ 881 la.sin.sin_port = 0; 882 883 /* create foreign address */ 884 sp = getservbyname("auth", "tcp"); 885 if (sp != NULL) 886 fa.sin.sin_port = sp->s_port; 887 else 888 fa.sin.sin_port = htons(113); 889 890 s = -1; 891 if (setjmp(CtxAuthTimeout) != 0) 892 { 893 if (s >= 0) 894 (void) close(s); 895 goto noident; 896 } 897 898 /* put a timeout around the whole thing */ 899 ev = setevent(TimeOuts.to_ident, authtimeout, 0); 900 901 /* connect to foreign IDENT server using same address as SMTP socket */ 902 s = socket(AF_INET, SOCK_STREAM, 0); 903 if (s < 0) 904 { 905 clrevent(ev); 906 goto noident; 907 } 908 if (bind(s, &la.sa, sizeof la.sin) < 0 || 909 connect(s, &fa.sa, sizeof fa.sin) < 0) 910 { 911 closeident: 912 (void) close(s); 913 clrevent(ev); 914 goto noident; 915 } 916 917 if (tTd(9, 10)) 918 printf("getauthinfo: sent %s", hbuf); 919 920 /* send query */ 921 if (write(s, hbuf, strlen(hbuf)) < 0) 922 goto closeident; 923 924 /* get result */ 925 i = read(s, hbuf, sizeof hbuf); 926 (void) close(s); 927 clrevent(ev); 928 if (i <= 0) 929 goto noident; 930 if (hbuf[--i] == '\n' && hbuf[--i] == '\r') 931 i--; 932 hbuf[++i] = '\0'; 933 934 if (tTd(9, 3)) 935 printf("getauthinfo: got %s\n", hbuf); 936 937 /* parse result */ 938 p = strchr(hbuf, ':'); 939 if (p == NULL) 940 { 941 /* malformed response */ 942 goto noident; 943 } 944 while (isascii(*++p) && isspace(*p)) 945 continue; 946 if (strncasecmp(p, "userid", 6) != 0) 947 { 948 /* presumably an error string */ 949 goto noident; 950 } 951 p += 6; 952 while (isascii(*p) && isspace(*p)) 953 p++; 954 if (*p++ != ':') 955 { 956 /* either useridxx or malformed response */ 957 goto noident; 958 } 959 960 /* p now points to the OSTYPE field */ 961 p = strchr(p, ':'); 962 if (p == NULL) 963 { 964 /* malformed response */ 965 goto noident; 966 } 967 968 /* 1413 says don't do this -- but it's broken otherwise */ 969 while (isascii(*++p) && isspace(*p)) 970 continue; 971 972 /* p now points to the authenticated name */ 973 (void) sprintf(hbuf, "%s@%s", 974 p, RealHostName == NULL ? "localhost" : RealHostName); 975 goto finish; 976 977 #endif /* IDENTPROTO */ 978 979 noident: 980 if (RealHostName == NULL) 981 { 982 if (tTd(9, 1)) 983 printf("getauthinfo: NULL\n"); 984 return NULL; 985 } 986 (void) strcpy(hbuf, RealHostName); 987 988 finish: 989 if (RealHostName != NULL && RealHostName[0] != '[') 990 { 991 p = &hbuf[strlen(hbuf)]; 992 (void) sprintf(p, " [%s]", anynet_ntoa(&RealHostAddr)); 993 } 994 if (tTd(9, 1)) 995 printf("getauthinfo: %s\n", hbuf); 996 return hbuf; 997 } 998 /* 999 ** HOST_MAP_LOOKUP -- turn a hostname into canonical form 1000 ** 1001 ** Parameters: 1002 ** map -- a pointer to this map (unused). 1003 ** name -- the (presumably unqualified) hostname. 1004 ** av -- unused -- for compatibility with other mapping 1005 ** functions. 1006 ** statp -- an exit status (out parameter) -- set to 1007 ** EX_TEMPFAIL if the name server is unavailable. 1008 ** 1009 ** Returns: 1010 ** The mapping, if found. 1011 ** NULL if no mapping found. 1012 ** 1013 ** Side Effects: 1014 ** Looks up the host specified in hbuf. If it is not 1015 ** the canonical name for that host, return the canonical 1016 ** name. 1017 */ 1018 1019 char * 1020 host_map_lookup(map, name, av, statp) 1021 MAP *map; 1022 char *name; 1023 char **av; 1024 int *statp; 1025 { 1026 register struct hostent *hp; 1027 u_long in_addr; 1028 char *cp; 1029 int i; 1030 register STAB *s; 1031 char hbuf[MAXNAME]; 1032 extern struct hostent *gethostbyaddr(); 1033 extern int h_errno; 1034 1035 /* 1036 ** See if we have already looked up this name. If so, just 1037 ** return it. 1038 */ 1039 1040 s = stab(name, ST_NAMECANON, ST_ENTER); 1041 if (bitset(NCF_VALID, s->s_namecanon.nc_flags)) 1042 { 1043 if (tTd(9, 1)) 1044 printf("host_map_lookup(%s) => CACHE %s\n", 1045 name, s->s_namecanon.nc_cname); 1046 errno = s->s_namecanon.nc_errno; 1047 h_errno = s->s_namecanon.nc_herrno; 1048 *statp = s->s_namecanon.nc_stat; 1049 if (CurEnv->e_message == NULL && *statp == EX_TEMPFAIL) 1050 { 1051 sprintf(hbuf, "%s: Name server timeout", 1052 shortenstring(name, 33)); 1053 CurEnv->e_message = newstr(hbuf); 1054 } 1055 return s->s_namecanon.nc_cname; 1056 } 1057 1058 /* 1059 ** If first character is a bracket, then it is an address 1060 ** lookup. Address is copied into a temporary buffer to 1061 ** strip the brackets and to preserve name if address is 1062 ** unknown. 1063 */ 1064 1065 if (*name != '[') 1066 { 1067 extern bool getcanonname(); 1068 1069 if (tTd(9, 1)) 1070 printf("host_map_lookup(%s) => ", name); 1071 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1072 (void) strcpy(hbuf, name); 1073 if (getcanonname(hbuf, sizeof hbuf - 1, TRUE)) 1074 { 1075 if (tTd(9, 1)) 1076 printf("%s\n", hbuf); 1077 cp = map_rewrite(map, hbuf, strlen(hbuf), av); 1078 s->s_namecanon.nc_cname = newstr(cp); 1079 return cp; 1080 } 1081 else 1082 { 1083 register struct hostent *hp; 1084 1085 if (tTd(9, 1)) 1086 printf("FAIL (%d)\n", h_errno); 1087 s->s_namecanon.nc_errno = errno; 1088 s->s_namecanon.nc_herrno = h_errno; 1089 switch (h_errno) 1090 { 1091 case TRY_AGAIN: 1092 if (UseNameServer) 1093 { 1094 sprintf(hbuf, "%s: Name server timeout", 1095 shortenstring(name, 33)); 1096 message("%s", hbuf); 1097 if (CurEnv->e_message == NULL) 1098 CurEnv->e_message = newstr(hbuf); 1099 } 1100 *statp = EX_TEMPFAIL; 1101 break; 1102 1103 case HOST_NOT_FOUND: 1104 *statp = EX_NOHOST; 1105 break; 1106 1107 case NO_RECOVERY: 1108 *statp = EX_SOFTWARE; 1109 break; 1110 1111 default: 1112 *statp = EX_UNAVAILABLE; 1113 break; 1114 } 1115 s->s_namecanon.nc_stat = *statp; 1116 if (*statp != EX_TEMPFAIL || UseNameServer) 1117 return NULL; 1118 1119 /* 1120 ** Try to look it up in /etc/hosts 1121 */ 1122 1123 hp = gethostbyname(name); 1124 if (hp == NULL) 1125 { 1126 /* no dice there either */ 1127 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1128 return NULL; 1129 } 1130 1131 s->s_namecanon.nc_stat = *statp = EX_OK; 1132 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1133 s->s_namecanon.nc_cname = newstr(cp); 1134 return cp; 1135 } 1136 } 1137 if ((cp = strchr(name, ']')) == NULL) 1138 return (NULL); 1139 *cp = '\0'; 1140 in_addr = inet_addr(&name[1]); 1141 1142 /* nope -- ask the name server */ 1143 hp = gethostbyaddr((char *)&in_addr, sizeof(struct in_addr), AF_INET); 1144 s->s_namecanon.nc_errno = errno; 1145 s->s_namecanon.nc_herrno = h_errno; 1146 s->s_namecanon.nc_flags |= NCF_VALID; /* will be soon */ 1147 if (hp == NULL) 1148 { 1149 s->s_namecanon.nc_stat = *statp = EX_NOHOST; 1150 return (NULL); 1151 } 1152 1153 /* found a match -- copy out */ 1154 cp = map_rewrite(map, hp->h_name, strlen(hp->h_name), av); 1155 s->s_namecanon.nc_stat = *statp = EX_OK; 1156 s->s_namecanon.nc_cname = newstr(cp); 1157 return cp; 1158 } 1159 /* 1160 ** ANYNET_NTOA -- convert a network address to printable form. 1161 ** 1162 ** Parameters: 1163 ** sap -- a pointer to a sockaddr structure. 1164 ** 1165 ** Returns: 1166 ** A printable version of that sockaddr. 1167 */ 1168 1169 char * 1170 anynet_ntoa(sap) 1171 register SOCKADDR *sap; 1172 { 1173 register char *bp; 1174 register char *ap; 1175 int l; 1176 static char buf[100]; 1177 1178 /* check for null/zero family */ 1179 if (sap == NULL) 1180 return "NULLADDR"; 1181 if (sap->sa.sa_family == 0) 1182 return "0"; 1183 1184 switch (sap->sa.sa_family) 1185 { 1186 #ifdef MAYBENEXTRELEASE /*** UNTESTED *** UNTESTED *** UNTESTED ***/ 1187 #ifdef NETUNIX 1188 case AF_UNIX: 1189 if (sap->sunix.sun_path[0] != '\0') 1190 sprintf(buf, "[UNIX: %.64s]", sap->sunix.sun_path); 1191 else 1192 sprintf(buf, "[UNIX: localhost]"); 1193 return buf; 1194 #endif 1195 #endif 1196 1197 #ifdef NETINET 1198 case AF_INET: 1199 return inet_ntoa(((struct sockaddr_in *) sap)->sin_addr); 1200 #endif 1201 1202 default: 1203 /* this case is only to ensure syntactic correctness */ 1204 break; 1205 } 1206 1207 /* unknown family -- just dump bytes */ 1208 (void) sprintf(buf, "Family %d: ", sap->sa.sa_family); 1209 bp = &buf[strlen(buf)]; 1210 ap = sap->sa.sa_data; 1211 for (l = sizeof sap->sa.sa_data; --l >= 0; ) 1212 { 1213 (void) sprintf(bp, "%02x:", *ap++ & 0377); 1214 bp += 3; 1215 } 1216 *--bp = '\0'; 1217 return buf; 1218 } 1219 /* 1220 ** HOSTNAMEBYANYADDR -- return name of host based on address 1221 ** 1222 ** Parameters: 1223 ** sap -- SOCKADDR pointer 1224 ** 1225 ** Returns: 1226 ** text representation of host name. 1227 ** 1228 ** Side Effects: 1229 ** none. 1230 */ 1231 1232 char * 1233 hostnamebyanyaddr(sap) 1234 register SOCKADDR *sap; 1235 { 1236 register struct hostent *hp; 1237 int saveretry; 1238 1239 #ifdef NAMED_BIND 1240 /* shorten name server timeout to avoid higher level timeouts */ 1241 saveretry = _res.retry; 1242 _res.retry = 3; 1243 #endif /* NAMED_BIND */ 1244 1245 switch (sap->sa.sa_family) 1246 { 1247 #ifdef NETINET 1248 case AF_INET: 1249 hp = gethostbyaddr((char *) &sap->sin.sin_addr, 1250 sizeof sap->sin.sin_addr, 1251 AF_INET); 1252 break; 1253 #endif 1254 1255 #ifdef NETISO 1256 case AF_ISO: 1257 hp = gethostbyaddr((char *) &sap->siso.siso_addr, 1258 sizeof sap->siso.siso_addr, 1259 AF_ISO); 1260 break; 1261 #endif 1262 1263 #ifdef MAYBENEXTRELEASE /*** UNTESTED *** UNTESTED *** UNTESTED ***/ 1264 case AF_UNIX: 1265 hp = NULL; 1266 break; 1267 #endif 1268 1269 default: 1270 hp = gethostbyaddr(sap->sa.sa_data, 1271 sizeof sap->sa.sa_data, 1272 sap->sa.sa_family); 1273 break; 1274 } 1275 1276 #ifdef NAMED_BIND 1277 _res.retry = saveretry; 1278 #endif /* NAMED_BIND */ 1279 1280 if (hp != NULL) 1281 return hp->h_name; 1282 else 1283 { 1284 /* produce a dotted quad */ 1285 static char buf[512]; 1286 1287 (void) sprintf(buf, "[%s]", anynet_ntoa(sap)); 1288 return buf; 1289 } 1290 } 1291 1292 # else /* DAEMON */ 1293 /* code for systems without sophisticated networking */ 1294 1295 /* 1296 ** MYHOSTNAME -- stub version for case of no daemon code. 1297 ** 1298 ** Can't convert to upper case here because might be a UUCP name. 1299 ** 1300 ** Mark, you can change this to be anything you want...... 1301 */ 1302 1303 char ** 1304 myhostname(hostbuf, size) 1305 char hostbuf[]; 1306 int size; 1307 { 1308 register FILE *f; 1309 1310 hostbuf[0] = '\0'; 1311 f = fopen("/usr/include/whoami", "r"); 1312 if (f != NULL) 1313 { 1314 (void) fgets(hostbuf, size, f); 1315 fixcrlf(hostbuf, TRUE); 1316 (void) fclose(f); 1317 } 1318 return (NULL); 1319 } 1320 /* 1321 ** GETAUTHINFO -- get the real host name asociated with a file descriptor 1322 ** 1323 ** Parameters: 1324 ** fd -- the descriptor 1325 ** 1326 ** Returns: 1327 ** The host name associated with this descriptor, if it can 1328 ** be determined. 1329 ** NULL otherwise. 1330 ** 1331 ** Side Effects: 1332 ** none 1333 */ 1334 1335 char * 1336 getauthinfo(fd) 1337 int fd; 1338 { 1339 return NULL; 1340 } 1341 /* 1342 ** MAPHOSTNAME -- turn a hostname into canonical form 1343 ** 1344 ** Parameters: 1345 ** map -- a pointer to the database map. 1346 ** name -- a buffer containing a hostname. 1347 ** avp -- a pointer to a (cf file defined) argument vector. 1348 ** statp -- an exit status (out parameter). 1349 ** 1350 ** Returns: 1351 ** mapped host name 1352 ** FALSE otherwise. 1353 ** 1354 ** Side Effects: 1355 ** Looks up the host specified in name. If it is not 1356 ** the canonical name for that host, replace it with 1357 ** the canonical name. If the name is unknown, or it 1358 ** is already the canonical name, leave it unchanged. 1359 */ 1360 1361 /*ARGSUSED*/ 1362 char * 1363 host_map_lookup(map, name, avp, statp) 1364 MAP *map; 1365 char *name; 1366 char **avp; 1367 char *statp; 1368 { 1369 register struct hostent *hp; 1370 1371 hp = gethostbyname(name); 1372 if (hp != NULL) 1373 return hp->h_name; 1374 *statp = EX_NOHOST; 1375 return NULL; 1376 } 1377 1378 #endif /* DAEMON */ 1379