contrib/sendmail/src/daemon.c

   1 /*
   2  * Copyright (c) 1998-2007 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
   5  * Copyright (c) 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * By using this file, you agree to the terms and conditions set
   9  * forth in the LICENSE file which can be found at the top level of
  10  * the sendmail distribution.
  11  *
  12  */
  13
  14 #include <sendmail.h>
  15 #include "map.h"
  16
  17 SM_RCSID("@(#)$Id: daemon.c,v 8.680 2008/02/14 00:20:26 ca Exp $")
  18
  19 #if defined(SOCK_STREAM) || defined(__GNU_LIBRARY__)
  20 # define USE_SOCK_STREAM        1
  21 #endif /* defined(SOCK_STREAM) || defined(__GNU_LIBRARY__) */
  22
  23 #if defined(USE_SOCK_STREAM)
  24 # if NETINET || NETINET6
  25 #  include <arpa/inet.h>
  26 # endif /* NETINET || NETINET6 */
  27 # if NAMED_BIND
  28 #  ifndef NO_DATA
  29 #   define NO_DATA      NO_ADDRESS
  30 #  endif /* ! NO_DATA */
  31 # endif /* NAMED_BIND */
  32 #endif /* defined(USE_SOCK_STREAM) */
  33
  34 #if STARTTLS
  35 #  include <openssl/rand.h>
  36 #endif /* STARTTLS */
  37
  38 #include <sm/time.h>
  39
  40 #if IP_SRCROUTE && NETINET
  41 # include <netinet/in_systm.h>
  42 # include <netinet/ip.h>
  43 # if HAS_IN_H
  44 #  include <netinet/in.h>
  45 #  ifndef IPOPTION
  46 #   define IPOPTION     ip_opts
  47 #   define IP_LIST      ip_opts
  48 #   define IP_DST       ip_dst
  49 #  endif /* ! IPOPTION */
  50 # else /* HAS_IN_H */
  51 #  include <netinet/ip_var.h>
  52 #  ifndef IPOPTION
  53 #   define IPOPTION     ipoption
  54 #   define IP_LIST      ipopt_list
  55 #   define IP_DST       ipopt_dst
  56 #  endif /* ! IPOPTION */
  57 # endif /* HAS_IN_H */
  58 #endif /* IP_SRCROUTE && NETINET */
  59
  60 #include <sm/fdset.h>
  61
  62 #define DAEMON_C 1
  63 #include <daemon.h>
  64
  65 static void             connecttimeout __P((int));
  66 static int              opendaemonsocket __P((DAEMON_T *, bool));
  67 static unsigned short   setupdaemon __P((SOCKADDR *));
  68 static void             getrequests_checkdiskspace __P((ENVELOPE *e));
  69 static void             setsockaddroptions __P((char *, DAEMON_T *));
  70 static void             printdaemonflags __P((DAEMON_T *));
  71 static int              addr_family __P((char *));
  72 static int              addrcmp __P((struct hostent *, char *, SOCKADDR *));
  73 static void             authtimeout __P((int));
  74
  75 /*
  76 **  DAEMON.C -- routines to use when running as a daemon.
  77 **
  78 **      This entire file is highly dependent on the 4.2 BSD
  79 **      interprocess communication primitives.  No attempt has
  80 **      been made to make this file portable to Version 7,
  81 **      Version 6, MPX files, etc.  If you should try such a
  82 **      thing yourself, I recommend chucking the entire file
  83 **      and starting from scratch.  Basic semantics are:
  84 **
  85 **      getrequests(e)
  86 **              Opens a port and initiates a connection.
  87 **              Returns in a child.  Must set InChannel and
  88 **              OutChannel appropriately.
  89 **      clrdaemon()
  90 **              Close any open files associated with getting
  91 **              the connection; this is used when running the queue,
  92 **              etc., to avoid having extra file descriptors during
  93 **              the queue run and to avoid confusing the network
  94 **              code (if it cares).
  95 **      makeconnection(host, port, mci, e, enough)
  96 **              Make a connection to the named host on the given
  97 **              port. Returns zero on success, else an exit status
  98 **              describing the error.
  99 **      host_map_lookup(map, hbuf, avp, pstat)
 100 **              Convert the entry in hbuf into a canonical form.
 101 */
 102
 103 static int      NDaemons = 0;                   /* actual number of daemons */
 104
 105 static time_t   NextDiskSpaceCheck = 0;
 106
 107 /*
 108 **  GETREQUESTS -- open mail IPC port and get requests.
 109 **
 110 **      Parameters:
 111 **              e -- the current envelope.
 112 **
 113 **      Returns:
 114 **              pointer to flags.
 115 **
 116 **      Side Effects:
 117 **              Waits until some interesting activity occurs.  When
 118 **              it does, a child is created to process it, and the
 119 **              parent waits for completion.  Return from this
 120 **              routine is always in the child.  The file pointers
 121 **              "InChannel" and "OutChannel" should be set to point
 122 **              to the communication channel.
 123 **              May restart persistent queue runners if they have ended
 124 **              for some reason.
 125 */
 126
 127 BITMAP256 *
 128 getrequests(e)
 129         ENVELOPE *e;
 130 {
 131         int t;
 132         int idx, curdaemon = -1;
 133         int i, olddaemon = 0;
 134 #if XDEBUG
 135         bool j_has_dot;
 136 #endif /* XDEBUG */
 137         char status[MAXLINE];
 138         SOCKADDR sa;
 139         SOCKADDR_LEN_T len = sizeof(sa);
 140 #if _FFR_QUEUE_RUN_PARANOIA
 141         time_t lastrun;
 142 #endif /* _FFR_QUEUE_RUN_PARANOIA */
 143 # if NETUNIX
 144         extern int ControlSocket;
 145 # endif /* NETUNIX */
 146         extern ENVELOPE BlankEnvelope;
 147
 148
 149         /* initialize data for function that generates queue ids */
 150         init_qid_alg();
 151         for (idx = 0; idx < NDaemons; idx++)
 152         {
 153                 Daemons[idx].d_port = setupdaemon(&(Daemons[idx].d_addr));
 154                 Daemons[idx].d_firsttime = true;
 155                 Daemons[idx].d_refuse_connections_until = (time_t) 0;
 156         }
 157
 158         /*
 159         **  Try to actually open the connection.
 160         */
 161
 162         if (tTd(15, 1))
 163         {
 164                 for (idx = 0; idx < NDaemons; idx++)
 165                 {
 166                         sm_dprintf("getrequests: daemon %s: port %d\n",
 167                                    Daemons[idx].d_name,
 168                                    ntohs(Daemons[idx].d_port));
 169                 }
 170         }
 171
 172         /* get a socket for the SMTP connection */
 173         for (idx = 0; idx < NDaemons; idx++)
 174                 Daemons[idx].d_socksize = opendaemonsocket(&Daemons[idx], true);
 175
 176         if (opencontrolsocket() < 0)
 177                 sm_syslog(LOG_WARNING, NOQID,
 178                           "daemon could not open control socket %s: %s",
 179                           ControlSocketName, sm_errstring(errno));
 180
 181         /* If there are any queue runners released reapchild() co-ord's */
 182         (void) sm_signal(SIGCHLD, reapchild);
 183
 184         /* write the pid to file, command line args to syslog */
 185         log_sendmail_pid(e);
 186
 187 #if XDEBUG
 188         {
 189                 char jbuf[MAXHOSTNAMELEN];
 190
 191                 expand("\201j", jbuf, sizeof(jbuf), e);
 192                 j_has_dot = strchr(jbuf, '.') != NULL;
 193         }
 194 #endif /* XDEBUG */
 195
 196         /* Add parent process as first item */
 197         proc_list_add(CurrentPid, "Sendmail daemon", PROC_DAEMON, 0, -1, NULL);
 198
 199         if (tTd(15, 1))
 200         {
 201                 for (idx = 0; idx < NDaemons; idx++)
 202                         sm_dprintf("getrequests: daemon %s: %d\n",
 203                                 Daemons[idx].d_name,
 204                                 Daemons[idx].d_socket);
 205         }
 206
 207         for (;;)
 208         {
 209                 register pid_t pid;
 210                 auto SOCKADDR_LEN_T lotherend;
 211                 bool timedout = false;
 212                 bool control = false;
 213                 int save_errno;
 214                 int pipefd[2];
 215                 time_t now;
 216 #if STARTTLS
 217                 long seed;
 218 #endif /* STARTTLS */
 219
 220                 /* see if we are rejecting connections */
 221                 (void) sm_blocksignal(SIGALRM);
 222                 CHECK_RESTART;
 223
 224                 for (idx = 0; idx < NDaemons; idx++)
 225                 {
 226                         /*
 227                         **  XXX do this call outside the loop?
 228                         **      no: refuse_connections may sleep().
 229                         */
 230
 231                         now = curtime();
 232                         if (now < Daemons[idx].d_refuse_connections_until)
 233                                 continue;
 234                         if (bitnset(D_DISABLE, Daemons[idx].d_flags))
 235                                 continue;
 236                         if (refuseconnections(e, idx, curdaemon == idx))
 237                         {
 238                                 if (Daemons[idx].d_socket >= 0)
 239                                 {
 240                                         /* close socket so peer fails quickly */
 241                                         (void) close(Daemons[idx].d_socket);
 242                                         Daemons[idx].d_socket = -1;
 243                                 }
 244
 245                                 /* refuse connections for next 15 seconds */
 246                                 Daemons[idx].d_refuse_connections_until = now + 15;
 247                         }
 248                         else if (Daemons[idx].d_socket < 0 ||
 249                                  Daemons[idx].d_firsttime)
 250                         {
 251                                 if (!Daemons[idx].d_firsttime && LogLevel > 8)
 252                                         sm_syslog(LOG_INFO, NOQID,
 253                                                 "accepting connections again for daemon %s",
 254                                                 Daemons[idx].d_name);
 255
 256                                 /* arrange to (re)open the socket if needed */
 257                                 (void) opendaemonsocket(&Daemons[idx], false);
 258                                 Daemons[idx].d_firsttime = false;
 259                         }
 260                 }
 261
 262                 /* May have been sleeping above, check again */
 263                 CHECK_RESTART;
 264
 265                 getrequests_checkdiskspace(e);
 266
 267 #if XDEBUG
 268                 /* check for disaster */
 269                 {
 270                         char jbuf[MAXHOSTNAMELEN];
 271
 272                         expand("\201j", jbuf, sizeof(jbuf), e);
 273                         if (!wordinclass(jbuf, 'w'))
 274                         {
 275                                 dumpstate("daemon lost $j");
 276                                 sm_syslog(LOG_ALERT, NOQID,
 277                                           "daemon process doesn't have $j in $=w; see syslog");
 278                                 abort();
 279                         }
 280                         else if (j_has_dot && strchr(jbuf, '.') == NULL)
 281                         {
 282                                 dumpstate("daemon $j lost dot");
 283                                 sm_syslog(LOG_ALERT, NOQID,
 284                                           "daemon process $j lost dot; see syslog");
 285                                 abort();
 286                         }
 287                 }
 288 #endif /* XDEBUG */
 289
 290 #if 0
 291                 /*
 292                 **  Andrew Sun <asun@ieps-sun.ml.com> claims that this will
 293                 **  fix the SVr4 problem.  But it seems to have gone away,
 294                 **  so is it worth doing this?
 295                 */
 296
 297                 if (DaemonSocket >= 0 &&
 298                     SetNonBlocking(DaemonSocket, false) < 0)
 299                         log an error here;
 300 #endif /* 0 */
 301                 (void) sm_releasesignal(SIGALRM);
 302
 303                 for (;;)
 304                 {
 305                         bool setproc = false;
 306                         int highest = -1;
 307                         fd_set readfds;
 308                         struct timeval timeout;
 309
 310                         CHECK_RESTART;
 311                         FD_ZERO(&readfds);
 312                         for (idx = 0; idx < NDaemons; idx++)
 313                         {
 314                                 /* wait for a connection */
 315                                 if (Daemons[idx].d_socket >= 0)
 316                                 {
 317                                         if (!setproc &&
 318                                             !bitnset(D_ETRNONLY,
 319                                                      Daemons[idx].d_flags))
 320                                         {
 321                                                 sm_setproctitle(true, e,
 322                                                                 "accepting connections");
 323                                                 setproc = true;
 324                                         }
 325                                         if (Daemons[idx].d_socket > highest)
 326                                                 highest = Daemons[idx].d_socket;
 327                                         SM_FD_SET(Daemons[idx].d_socket,
 328                                                   &readfds);
 329                                 }
 330                         }
 331
 332 #if NETUNIX
 333                         if (ControlSocket >= 0)
 334                         {
 335                                 if (ControlSocket > highest)
 336                                         highest = ControlSocket;
 337                                 SM_FD_SET(ControlSocket, &readfds);
 338                         }
 339 #endif /* NETUNIX */
 340
 341                         timeout.tv_sec = 5;
 342                         timeout.tv_usec = 0;
 343
 344                         t = select(highest + 1, FDSET_CAST &readfds,
 345                                    NULL, NULL, &timeout);
 346
 347                         /* Did someone signal while waiting? */
 348                         CHECK_RESTART;
 349
 350                         curdaemon = -1;
 351                         if (doqueuerun())
 352                         {
 353                                 (void) runqueue(true, false, false, false);
 354 #if _FFR_QUEUE_RUN_PARANOIA
 355                                 lastrun = now;
 356 #endif /* _FFR_QUEUE_RUN_PARANOIA */
 357                         }
 358 #if _FFR_QUEUE_RUN_PARANOIA
 359                         else if (CheckQueueRunners > 0 && QueueIntvl > 0 &&
 360                                  lastrun + QueueIntvl + CheckQueueRunners < now)
 361                         {
 362
 363                                 /*
 364                                 **  set lastrun unconditionally to avoid
 365                                 **  calling checkqueuerunner() all the time.
 366                                 **  That's also why we currently ignore the
 367                                 **  result of the function call.
 368                                 */
 369
 370                                 (void) checkqueuerunner();
 371                                 lastrun = now;
 372                         }
 373 #endif /* _FFR_QUEUE_RUN_PARANOIA */
 374
 375                         if (t <= 0)
 376                         {
 377                                 timedout = true;
 378                                 break;
 379                         }
 380
 381                         control = false;
 382                         errno = 0;
 383
 384                         /* look "round-robin" for an active socket */
 385                         if ((idx = olddaemon + 1) >= NDaemons)
 386                                 idx = 0;
 387                         for (i = 0; i < NDaemons; i++)
 388                         {
 389                                 if (Daemons[idx].d_socket >= 0 &&
 390                                     SM_FD_ISSET(Daemons[idx].d_socket,
 391                                                 &readfds))
 392                                 {
 393                                         lotherend = Daemons[idx].d_socksize;
 394                                         memset(&RealHostAddr, '\0',
 395                                                sizeof(RealHostAddr));
 396                                         t = accept(Daemons[idx].d_socket,
 397                                                    (struct sockaddr *)&RealHostAddr,
 398                                                    &lotherend);
 399
 400                                         /*
 401                                         **  If remote side closes before
 402                                         **  accept() finishes, sockaddr
 403                                         **  might not be fully filled in.
 404                                         */
 405
 406                                         if (t >= 0 &&
 407                                             (lotherend == 0 ||
 408 # ifdef BSD4_4_SOCKADDR
 409                                              RealHostAddr.sa.sa_len == 0 ||
 410 # endif /* BSD4_4_SOCKADDR */
 411                                              RealHostAddr.sa.sa_family != Daemons[idx].d_addr.sa.sa_family))
 412                                         {
 413                                                 (void) close(t);
 414                                                 t = -1;
 415                                                 errno = EINVAL;
 416                                         }
 417                                         olddaemon = curdaemon = idx;
 418                                         break;
 419                                 }
 420                                 if (++idx >= NDaemons)
 421                                         idx = 0;
 422                         }
 423 #if NETUNIX
 424                         if (curdaemon == -1 && ControlSocket >= 0 &&
 425                             SM_FD_ISSET(ControlSocket, &readfds))
 426                         {
 427                                 struct sockaddr_un sa_un;
 428
 429                                 lotherend = sizeof(sa_un);
 430                                 memset(&sa_un, '\0', sizeof(sa_un));
 431                                 t = accept(ControlSocket,
 432                                            (struct sockaddr *)&sa_un,
 433                                            &lotherend);
 434
 435                                 /*
 436                                 **  If remote side closes before
 437                                 **  accept() finishes, sockaddr
 438                                 **  might not be fully filled in.
 439                                 */
 440
 441                                 if (t >= 0 &&
 442                                     (lotherend == 0 ||
 443 # ifdef BSD4_4_SOCKADDR
 444                                      sa_un.sun_len == 0 ||
 445 # endif /* BSD4_4_SOCKADDR */
 446                                      sa_un.sun_family != AF_UNIX))
 447                                 {
 448                                         (void) close(t);
 449                                         t = -1;
 450                                         errno = EINVAL;
 451                                 }
 452                                 if (t >= 0)
 453                                         control = true;
 454                         }
 455 #else /* NETUNIX */
 456                         if (curdaemon == -1)
 457                         {
 458                                 /* No daemon to service */
 459                                 continue;
 460                         }
 461 #endif /* NETUNIX */
 462                         if (t >= 0 || errno != EINTR)
 463                                 break;
 464                 }
 465                 if (timedout)
 466                 {
 467                         timedout = false;
 468                         continue;
 469                 }
 470                 save_errno = errno;
 471                 (void) sm_blocksignal(SIGALRM);
 472                 if (t < 0)
 473                 {
 474                         errno = save_errno;
 475
 476                         /* let's ignore these temporary errors */
 477                         if (save_errno == EINTR
 478 #ifdef EAGAIN
 479                             || save_errno == EAGAIN
 480 #endif /* EAGAIN */
 481 #ifdef ECONNABORTED
 482                             || save_errno == ECONNABORTED
 483 #endif /* ECONNABORTED */
 484 #ifdef EWOULDBLOCK
 485                             || save_errno == EWOULDBLOCK
 486 #endif /* EWOULDBLOCK */
 487                            )
 488                                 continue;
 489
 490                         syserr("getrequests: accept");
 491
 492                         if (curdaemon >= 0)
 493                         {
 494                                 /* arrange to re-open socket next time around */
 495                                 (void) close(Daemons[curdaemon].d_socket);
 496                                 Daemons[curdaemon].d_socket = -1;
 497 #if SO_REUSEADDR_IS_BROKEN
 498                                 /*
 499                                 **  Give time for bound socket to be released.
 500                                 **  This creates a denial-of-service if you can
 501                                 **  force accept() to fail on affected systems.
 502                                 */
 503
 504                                 Daemons[curdaemon].d_refuse_connections_until =
 505                                         curtime() + 15;
 506 #endif /* SO_REUSEADDR_IS_BROKEN */
 507                         }
 508                         continue;
 509                 }
 510
 511                 if (!control)
 512                 {
 513                         /* set some daemon related macros */
 514                         switch (Daemons[curdaemon].d_addr.sa.sa_family)
 515                         {
 516                           case AF_UNSPEC:
 517                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 518                                         macid("{daemon_family}"), "unspec");
 519                                 break;
 520 #if _FFR_DAEMON_NETUNIX
 521 # if NETUNIX
 522                           case AF_UNIX:
 523                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 524                                         macid("{daemon_family}"), "local");
 525                                 break;
 526 # endif /* NETUNIX */
 527 #endif /* _FFR_DAEMON_NETUNIX */
 528 #if NETINET
 529                           case AF_INET:
 530                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 531                                         macid("{daemon_family}"), "inet");
 532                                 break;
 533 #endif /* NETINET */
 534 #if NETINET6
 535                           case AF_INET6:
 536                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 537                                         macid("{daemon_family}"), "inet6");
 538                                 break;
 539 #endif /* NETINET6 */
 540 #if NETISO
 541                           case AF_ISO:
 542                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 543                                         macid("{daemon_family}"), "iso");
 544                                 break;
 545 #endif /* NETISO */
 546 #if NETNS
 547                           case AF_NS:
 548                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 549                                         macid("{daemon_family}"), "ns");
 550                                 break;
 551 #endif /* NETNS */
 552 #if NETX25
 553                           case AF_CCITT:
 554                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 555                                         macid("{daemon_family}"), "x.25");
 556                                 break;
 557 #endif /* NETX25 */
 558                         }
 559                         macdefine(&BlankEnvelope.e_macro, A_PERM,
 560                                 macid("{daemon_name}"),
 561                                 Daemons[curdaemon].d_name);
 562                         if (Daemons[curdaemon].d_mflags != NULL)
 563                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 564                                         macid("{daemon_flags}"),
 565                                         Daemons[curdaemon].d_mflags);
 566                         else
 567                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 568                                         macid("{daemon_flags}"), "");
 569                 }
 570
 571                 /*
 572                 **  If connection rate is exceeded here, connection shall be
 573                 **  refused later by a new call after fork() by the
 574                 **  validate_connection() function. Closing the connection
 575                 **  at this point violates RFC 2821.
 576                 **  Do NOT remove this call, its side effects are needed.
 577                 */
 578
 579                 connection_rate_check(&RealHostAddr, NULL);
 580
 581                 /*
 582                 **  Create a subprocess to process the mail.
 583                 */
 584
 585                 if (tTd(15, 2))
 586                         sm_dprintf("getrequests: forking (fd = %d)\n", t);
 587
 588                 /*
 589                 **  Advance state of PRNG.
 590                 **  This is necessary because otherwise all child processes
 591                 **  will produce the same PRN sequence and hence the selection
 592                 **  of a queue directory (and other things, e.g., MX selection)
 593                 **  are not "really" random.
 594                 */
 595 #if STARTTLS
 596                 /* XXX get some better "random" data? */
 597                 seed = get_random();
 598                 RAND_seed((void *) &NextDiskSpaceCheck,
 599                           sizeof(NextDiskSpaceCheck));
 600                 RAND_seed((void *) &now, sizeof(now));
 601                 RAND_seed((void *) &seed, sizeof(seed));
 602 #else /* STARTTLS */
 603                 (void) get_random();
 604 #endif /* STARTTLS */
 605
 606 #if NAMED_BIND
 607                 /*
 608                 **  Update MX records for FallbackMX.
 609                 **  Let's hope this is fast otherwise we screw up the
 610                 **  response time.
 611                 */
 612
 613                 if (FallbackMX != NULL)
 614                         (void) getfallbackmxrr(FallbackMX);
 615 #endif /* NAMED_BIND */
 616
 617                 if (tTd(93, 100))
 618                 {
 619                         /* don't fork, handle connection in this process */
 620                         pid = 0;
 621                         pipefd[0] = pipefd[1] = -1;
 622                 }
 623                 else
 624                 {
 625                         /*
 626                         **  Create a pipe to keep the child from writing to
 627                         **  the socket until after the parent has closed
 628                         **  it.  Otherwise the parent may hang if the child
 629                         **  has closed it first.
 630                         */
 631
 632                         if (pipe(pipefd) < 0)
 633                                 pipefd[0] = pipefd[1] = -1;
 634
 635                         (void) sm_blocksignal(SIGCHLD);
 636                         pid = fork();
 637                         if (pid < 0)
 638                         {
 639                                 syserr("daemon: cannot fork");
 640                                 if (pipefd[0] != -1)
 641                                 {
 642                                         (void) close(pipefd[0]);
 643                                         (void) close(pipefd[1]);
 644                                 }
 645                                 (void) sm_releasesignal(SIGCHLD);
 646                                 (void) sleep(10);
 647                                 (void) close(t);
 648                                 continue;
 649                         }
 650                 }
 651
 652                 if (pid == 0)
 653                 {
 654                         char *p;
 655                         SM_FILE_T *inchannel, *outchannel = NULL;
 656
 657                         /*
 658                         **  CHILD -- return to caller.
 659                         **      Collect verified idea of sending host.
 660                         **      Verify calling user id if possible here.
 661                         */
 662
 663                         /* Reset global flags */
 664                         RestartRequest = NULL;
 665                         RestartWorkGroup = false;
 666                         ShutdownRequest = NULL;
 667                         PendingSignal = 0;
 668                         CurrentPid = getpid();
 669                         close_sendmail_pid();
 670
 671                         (void) sm_releasesignal(SIGALRM);
 672                         (void) sm_releasesignal(SIGCHLD);
 673                         (void) sm_signal(SIGCHLD, SIG_DFL);
 674                         (void) sm_signal(SIGHUP, SIG_DFL);
 675                         (void) sm_signal(SIGTERM, intsig);
 676
 677                         /* turn on profiling */
 678                         /* SM_PROF(0); */
 679
 680                         /*
 681                         **  Initialize exception stack and default exception
 682                         **  handler for child process.
 683                         */
 684
 685                         sm_exc_newthread(fatal_error);
 686
 687                         if (!control)
 688                         {
 689                                 macdefine(&BlankEnvelope.e_macro, A_TEMP,
 690                                         macid("{daemon_addr}"),
 691                                         anynet_ntoa(&Daemons[curdaemon].d_addr));
 692                                 (void) sm_snprintf(status, sizeof(status), "%d",
 693                                                 ntohs(Daemons[curdaemon].d_port));
 694                                 macdefine(&BlankEnvelope.e_macro, A_TEMP,
 695                                         macid("{daemon_port}"), status);
 696                         }
 697
 698                         for (idx = 0; idx < NDaemons; idx++)
 699                         {
 700                                 if (Daemons[idx].d_socket >= 0)
 701                                         (void) close(Daemons[idx].d_socket);
 702                                 Daemons[idx].d_socket = -1;
 703                         }
 704                         clrcontrol();
 705
 706                         /* Avoid SMTP daemon actions if control command */
 707                         if (control)
 708                         {
 709                                 /* Add control socket process */
 710                                 proc_list_add(CurrentPid,
 711                                               "console socket child",
 712                                               PROC_CONTROL_CHILD, 0, -1, NULL);
 713                         }
 714                         else
 715                         {
 716                                 proc_list_clear();
 717
 718                                 /* clean up background delivery children */
 719                                 (void) sm_signal(SIGCHLD, reapchild);
 720
 721                                 /* Add parent process as first child item */
 722                                 proc_list_add(CurrentPid, "daemon child",
 723                                               PROC_DAEMON_CHILD, 0, -1, NULL);
 724                                 /* don't schedule queue runs if ETRN */
 725                                 QueueIntvl = 0;
 726
 727                                 /*
 728                                 **  Hack: override global variables if
 729                                 **      the corresponding DaemonPortOption
 730                                 **      is set.
 731                                 */
 732 #if _FFR_SS_PER_DAEMON
 733                                 if (Daemons[curdaemon].d_supersafe !=
 734                                     DPO_NOTSET)
 735                                         SuperSafe = Daemons[curdaemon].
 736                                                                 d_supersafe;
 737 #endif /* _FFR_SS_PER_DAEMON */
 738                                 if (Daemons[curdaemon].d_dm != DM_NOTSET)
 739                                         set_delivery_mode(
 740                                                 Daemons[curdaemon].d_dm, e);
 741
 742                                 if (Daemons[curdaemon].d_refuseLA !=
 743                                     DPO_NOTSET)
 744                                         RefuseLA = Daemons[curdaemon].
 745                                                                 d_refuseLA;
 746                                 if (Daemons[curdaemon].d_queueLA != DPO_NOTSET)
 747                                         QueueLA = Daemons[curdaemon].d_queueLA;
 748                                 if (Daemons[curdaemon].d_delayLA != DPO_NOTSET)
 749                                         DelayLA = Daemons[curdaemon].d_delayLA;
 750                                 if (Daemons[curdaemon].d_maxchildren !=
 751                                     DPO_NOTSET)
 752                                         MaxChildren = Daemons[curdaemon].
 753                                                                 d_maxchildren;
 754
 755                                 sm_setproctitle(true, e, "startup with %s",
 756                                                 anynet_ntoa(&RealHostAddr));
 757                         }
 758
 759                         if (pipefd[0] != -1)
 760                         {
 761                                 auto char c;
 762
 763                                 /*
 764                                 **  Wait for the parent to close the write end
 765                                 **  of the pipe, which we will see as an EOF.
 766                                 **  This guarantees that we won't write to the
 767                                 **  socket until after the parent has closed
 768                                 **  the pipe.
 769                                 */
 770
 771                                 /* close the write end of the pipe */
 772                                 (void) close(pipefd[1]);
 773
 774                                 /* we shouldn't be interrupted, but ... */
 775                                 while (read(pipefd[0], &c, 1) < 0 &&
 776                                        errno == EINTR)
 777                                         continue;
 778                                 (void) close(pipefd[0]);
 779                         }
 780
 781                         /* control socket processing */
 782                         if (control)
 783                         {
 784                                 control_command(t, e);
 785                                 /* NOTREACHED */
 786                                 exit(EX_SOFTWARE);
 787                         }
 788
 789                         /* determine host name */
 790                         p = hostnamebyanyaddr(&RealHostAddr);
 791                         if (strlen(p) > MAXNAME) /* XXX  - 1 ? */
 792                                 p[MAXNAME] = '\0';
 793                         RealHostName = newstr(p);
 794                         if (RealHostName[0] == '[')
 795                         {
 796                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 797                                         macid("{client_resolve}"),
 798                                         h_errno == TRY_AGAIN ? "TEMP" : "FAIL");
 799                         }
 800                         else
 801                         {
 802                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 803                                           macid("{client_resolve}"), "OK");
 804                         }
 805                         sm_setproctitle(true, e, "startup with %s", p);
 806                         markstats(e, NULL, STATS_CONNECT);
 807
 808                         if ((inchannel = sm_io_open(SmFtStdiofd,
 809                                                     SM_TIME_DEFAULT,
 810                                                     (void *) &t,
 811                                                     SM_IO_RDONLY_B,
 812                                                     NULL)) == NULL ||
 813                             (t = dup(t)) < 0 ||
 814                             (outchannel = sm_io_open(SmFtStdiofd,
 815                                                      SM_TIME_DEFAULT,
 816                                                      (void *) &t,
 817                                                      SM_IO_WRONLY_B,
 818                                                      NULL)) == NULL)
 819                         {
 820                                 syserr("cannot open SMTP server channel, fd=%d",
 821                                         t);
 822                                 finis(false, true, EX_OK);
 823                         }
 824                         sm_io_automode(inchannel, outchannel);
 825
 826                         InChannel = inchannel;
 827                         OutChannel = outchannel;
 828                         DisConnected = false;
 829
 830 #if XLA
 831                         if (!xla_host_ok(RealHostName))
 832                         {
 833                                 message("421 4.4.5 Too many SMTP sessions for this host");
 834                                 finis(false, true, EX_OK);
 835                         }
 836 #endif /* XLA */
 837                         /* find out name for interface of connection */
 838                         if (getsockname(sm_io_getinfo(InChannel, SM_IO_WHAT_FD,
 839                                                       NULL), &sa.sa, &len) == 0)
 840                         {
 841                                 p = hostnamebyanyaddr(&sa);
 842                                 if (tTd(15, 9))
 843                                         sm_dprintf("getreq: got name %s\n", p);
 844                                 macdefine(&BlankEnvelope.e_macro, A_TEMP,
 845                                         macid("{if_name}"), p);
 846
 847                                 /*
 848                                 **  Do this only if it is not the loopback
 849                                 **  interface.
 850                                 */
 851
 852                                 if (!isloopback(sa))
 853                                 {
 854                                         char *addr;
 855                                         char family[5];
 856
 857                                         addr = anynet_ntoa(&sa);
 858                                         (void) sm_snprintf(family,
 859                                                 sizeof(family),
 860                                                 "%d", sa.sa.sa_family);
 861                                         macdefine(&BlankEnvelope.e_macro,
 862                                                 A_TEMP,
 863                                                 macid("{if_addr}"), addr);
 864                                         macdefine(&BlankEnvelope.e_macro,
 865                                                 A_TEMP,
 866                                                 macid("{if_family}"), family);
 867                                         if (tTd(15, 7))
 868                                                 sm_dprintf("getreq: got addr %s and family %s\n",
 869                                                         addr, family);
 870                                 }
 871                                 else
 872                                 {
 873                                         macdefine(&BlankEnvelope.e_macro,
 874                                                 A_PERM,
 875                                                 macid("{if_addr}"), NULL);
 876                                         macdefine(&BlankEnvelope.e_macro,
 877                                                 A_PERM,
 878                                                 macid("{if_family}"), NULL);
 879                                 }
 880                         }
 881                         else
 882                         {
 883                                 if (tTd(15, 7))
 884                                         sm_dprintf("getreq: getsockname failed\n");
 885                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 886                                         macid("{if_name}"), NULL);
 887                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 888                                         macid("{if_addr}"), NULL);
 889                                 macdefine(&BlankEnvelope.e_macro, A_PERM,
 890                                         macid("{if_family}"), NULL);
 891                         }
 892                         break;
 893                 }
 894
 895                 /* parent -- keep track of children */
 896                 if (control)
 897                 {
 898                         (void) sm_snprintf(status, sizeof(status),
 899                                            "control socket server child");
 900                         proc_list_add(pid, status, PROC_CONTROL, 0, -1, NULL);
 901                 }
 902                 else
 903                 {
 904                         (void) sm_snprintf(status, sizeof(status),
 905                                            "SMTP server child for %s",
 906                                            anynet_ntoa(&RealHostAddr));
 907                         proc_list_add(pid, status, PROC_DAEMON, 0, -1,
 908                                         &RealHostAddr);
 909                 }
 910                 (void) sm_releasesignal(SIGCHLD);
 911
 912                 /* close the read end of the synchronization pipe */
 913                 if (pipefd[0] != -1)
 914                 {
 915                         (void) close(pipefd[0]);
 916                         pipefd[0] = -1;
 917                 }
 918
 919                 /* close the port so that others will hang (for a while) */
 920                 (void) close(t);
 921
 922                 /* release the child by closing the read end of the sync pipe */
 923                 if (pipefd[1] != -1)
 924                 {
 925                         (void) close(pipefd[1]);
 926                         pipefd[1] = -1;
 927                 }
 928         }
 929         if (tTd(15, 2))
 930                 sm_dprintf("getreq: returning\n");
 931
 932 #if MILTER
 933         /* set the filters for this daemon */
 934         if (Daemons[curdaemon].d_inputfilterlist != NULL)
 935         {
 936                 for (i = 0;
 937                      (i < MAXFILTERS &&
 938                       Daemons[curdaemon].d_inputfilters[i] != NULL);
 939                      i++)
 940                 {
 941                         InputFilters[i] = Daemons[curdaemon].d_inputfilters[i];
 942                 }
 943                 if (i < MAXFILTERS)
 944                         InputFilters[i] = NULL;
 945         }
 946 #endif /* MILTER */
 947         return &Daemons[curdaemon].d_flags;
 948 }
 949
 950 /*
 951 **  GETREQUESTS_CHECKDISKSPACE -- check available diskspace.
 952 **
 953 **      Parameters:
 954 **              e -- envelope.
 955 **
 956 **      Returns:
 957 **              none.
 958 **
 959 **      Side Effects:
 960 **              Modifies Daemon flags (D_ETRNONLY) if not enough disk space.
 961 */
 962
 963 static void
 964 getrequests_checkdiskspace(e)
 965         ENVELOPE *e;
 966 {
 967         bool logged = false;
 968         int idx;
 969         time_t now;
 970
 971         now = curtime();
 972         if (now < NextDiskSpaceCheck)
 973                 return;
 974
 975         /* Check if there is available disk space in all queue groups. */
 976         if (!enoughdiskspace(0, NULL))
 977         {
 978                 for (idx = 0; idx < NDaemons; ++idx)
 979                 {
 980                         if (bitnset(D_ETRNONLY, Daemons[idx].d_flags))
 981                                 continue;
 982
 983                         /* log only if not logged before */
 984                         if (!logged)
 985                         {
 986                                 if (LogLevel > 8)
 987                                         sm_syslog(LOG_INFO, NOQID,
 988                                                   "rejecting new messages: min free: %ld",
 989                                                   MinBlocksFree);
 990                                 sm_setproctitle(true, e,
 991                                                 "rejecting new messages: min free: %ld",
 992                                                 MinBlocksFree);
 993                                 logged = true;
 994                         }
 995                         setbitn(D_ETRNONLY, Daemons[idx].d_flags);
 996                 }
 997         }
 998         else
 999         {
1000                 for (idx = 0; idx < NDaemons; ++idx)
1001                 {
1002                         if (!bitnset(D_ETRNONLY, Daemons[idx].d_flags))
1003                                 continue;
1004
1005                         /* log only if not logged before */
1006                         if (!logged)
1007                         {
1008                                 if (LogLevel > 8)
1009                                         sm_syslog(LOG_INFO, NOQID,
1010                                                   "accepting new messages (again)");
1011                                 logged = true;
1012                         }
1013
1014                         /* title will be set later */
1015                         clrbitn(D_ETRNONLY, Daemons[idx].d_flags);
1016                 }
1017         }
1018
1019         /* only check disk space once a minute */
1020         NextDiskSpaceCheck = now + 60;
1021 }
1022
1023 /*
1024 **  OPENDAEMONSOCKET -- open SMTP socket
1025 **
1026 **      Deals with setting all appropriate options.
1027 **
1028 **      Parameters:
1029 **              d -- the structure for the daemon to open.
1030 **              firsttime -- set if this is the initial open.
1031 **
1032 **      Returns:
1033 **              Size in bytes of the daemon socket addr.
1034 **
1035 **      Side Effects:
1036 **              Leaves DaemonSocket set to the open socket.
1037 **              Exits if the socket cannot be created.
1038 */
1039
1040 #define MAXOPENTRIES    10      /* maximum number of tries to open connection */
1041
1042 static int
1043 opendaemonsocket(d, firsttime)
1044         DAEMON_T *d;
1045         bool firsttime;
1046 {
1047         int on = 1;
1048         int fdflags;
1049         SOCKADDR_LEN_T socksize = 0;
1050         int ntries = 0;
1051         int save_errno;
1052
1053         if (tTd(15, 2))
1054                 sm_dprintf("opendaemonsocket(%s)\n", d->d_name);
1055
1056         do
1057         {
1058                 if (ntries > 0)
1059                         (void) sleep(5);
1060                 if (firsttime || d->d_socket < 0)
1061                 {
1062 #if _FFR_DAEMON_NETUNIX
1063 # if NETUNIX
1064                         if (d->d_addr.sa.sa_family == AF_UNIX)
1065                         {
1066                                 int rval;
1067                                 long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_ROOTOK|SFF_EXECOK|SFF_CREAT;
1068
1069                                 /* if not safe, don't use it */
1070                                 rval = safefile(d->d_addr.sunix.sun_path,
1071                                                 RunAsUid, RunAsGid,
1072                                                 RunAsUserName, sff,
1073                                                 S_IRUSR|S_IWUSR, NULL);
1074                                 if (rval != 0)
1075                                 {
1076                                         save_errno = errno;
1077                                         syserr("opendaemonsocket: daemon %s: unsafe domain socket %s",
1078                                                d->d_name,
1079                                                d->d_addr.sunix.sun_path);
1080                                         goto fail;
1081                                 }
1082
1083                                 /* Don't try to overtake an existing socket */
1084                                 (void) unlink(d->d_addr.sunix.sun_path);
1085                         }
1086 # endif /* NETUNIX */
1087 #endif /* _FFR_DOMAIN_NETUNIX */
1088                         d->d_socket = socket(d->d_addr.sa.sa_family,
1089                                              SOCK_STREAM, 0);
1090                         if (d->d_socket < 0)
1091                         {
1092                                 save_errno = errno;
1093                                 syserr("opendaemonsocket: daemon %s: can't create server SMTP socket",
1094                                        d->d_name);
1095                           fail:
1096                                 if (bitnset(D_OPTIONAL, d->d_flags) &&
1097                                     (!transienterror(save_errno) ||
1098                                      ntries >= MAXOPENTRIES - 1))
1099                                 {
1100                                         syserr("opendaemonsocket: daemon %s: optional socket disabled",
1101                                                d->d_name);
1102                                         setbitn(D_DISABLE, d->d_flags);
1103                                         d->d_socket = -1;
1104                                         return -1;
1105                                 }
1106                           severe:
1107                                 if (LogLevel > 0)
1108                                         sm_syslog(LOG_ALERT, NOQID,
1109                                                   "daemon %s: problem creating SMTP socket",
1110                                                   d->d_name);
1111                                 d->d_socket = -1;
1112                                 continue;
1113                         }
1114
1115                         if (SM_FD_SETSIZE > 0 && d->d_socket >= SM_FD_SETSIZE)
1116                         {
1117                                 save_errno = EINVAL;
1118                                 syserr("opendaemonsocket: daemon %s: server SMTP socket (%d) too large",
1119                                        d->d_name, d->d_socket);
1120                                 goto fail;
1121                         }
1122
1123                         /* turn on network debugging? */
1124                         if (tTd(15, 101))
1125                                 (void) setsockopt(d->d_socket, SOL_SOCKET,
1126                                                   SO_DEBUG, (char *)&on,
1127                                                   sizeof(on));
1128
1129                         (void) setsockopt(d->d_socket, SOL_SOCKET,
1130                                           SO_REUSEADDR, (char *)&on, sizeof(on));
1131                         (void) setsockopt(d->d_socket, SOL_SOCKET,
1132                                           SO_KEEPALIVE, (char *)&on, sizeof(on));
1133
1134 #ifdef SO_RCVBUF
1135                         if (d->d_tcprcvbufsize > 0)
1136                         {
1137                                 if (setsockopt(d->d_socket, SOL_SOCKET,
1138                                                SO_RCVBUF,
1139                                                (char *) &d->d_tcprcvbufsize,
1140                                                sizeof(d->d_tcprcvbufsize)) < 0)
1141                                         syserr("opendaemonsocket: daemon %s: setsockopt(SO_RCVBUF)", d->d_name);
1142                         }
1143 #endif /* SO_RCVBUF */
1144 #ifdef SO_SNDBUF
1145                         if (d->d_tcpsndbufsize > 0)
1146                         {
1147                                 if (setsockopt(d->d_socket, SOL_SOCKET,
1148                                                SO_SNDBUF,
1149                                                (char *) &d->d_tcpsndbufsize,
1150                                                sizeof(d->d_tcpsndbufsize)) < 0)
1151                                         syserr("opendaemonsocket: daemon %s: setsockopt(SO_SNDBUF)", d->d_name);
1152                         }
1153 #endif /* SO_SNDBUF */
1154
1155                         if ((fdflags = fcntl(d->d_socket, F_GETFD, 0)) == -1 ||
1156                             fcntl(d->d_socket, F_SETFD,
1157                                   fdflags | FD_CLOEXEC) == -1)
1158                         {
1159                                 save_errno = errno;
1160                                 syserr("opendaemonsocket: daemon %s: failed to %s close-on-exec flag: %s",
1161                                        d->d_name,
1162                                        fdflags == -1 ? "get" : "set",
1163                                        sm_errstring(save_errno));
1164                                 (void) close(d->d_socket);
1165                                 goto severe;
1166                         }
1167
1168                         switch (d->d_addr.sa.sa_family)
1169                         {
1170 #if _FFR_DAEMON_NETUNIX
1171 # ifdef NETUNIX
1172                           case AF_UNIX:
1173                                 socksize = sizeof(d->d_addr.sunix);
1174                                 break;
1175 # endif /* NETUNIX */
1176 #endif /* _FFR_DAEMON_NETUNIX */
1177 #if NETINET
1178                           case AF_INET:
1179                                 socksize = sizeof(d->d_addr.sin);
1180                                 break;
1181 #endif /* NETINET */
1182
1183 #if NETINET6
1184                           case AF_INET6:
1185                                 socksize = sizeof(d->d_addr.sin6);
1186                                 break;
1187 #endif /* NETINET6 */
1188
1189 #if NETISO
1190                           case AF_ISO:
1191                                 socksize = sizeof(d->d_addr.siso);
1192                                 break;
1193 #endif /* NETISO */
1194
1195                           default:
1196                                 socksize = sizeof(d->d_addr);
1197                                 break;
1198                         }
1199
1200                         if (bind(d->d_socket, &d->d_addr.sa, socksize) < 0)
1201                         {
1202                                 /* probably another daemon already */
1203                                 save_errno = errno;
1204                                 syserr("opendaemonsocket: daemon %s: cannot bind",
1205                                        d->d_name);
1206                                 (void) close(d->d_socket);
1207                                 goto fail;
1208                         }
1209                 }
1210                 if (!firsttime &&
1211                     listen(d->d_socket, d->d_listenqueue) < 0)
1212                 {
1213                         save_errno = errno;
1214                         syserr("opendaemonsocket: daemon %s: cannot listen",
1215                                d->d_name);
1216                         (void) close(d->d_socket);
1217                         goto severe;
1218                 }
1219                 return socksize;
1220         } while (ntries++ < MAXOPENTRIES && transienterror(save_errno));
1221         syserr("!opendaemonsocket: daemon %s: server SMTP socket wedged: exiting",
1222                d->d_name);
1223         /* NOTREACHED */
1224         return -1;  /* avoid compiler warning on IRIX */
1225 }
1226 /*
1227 **  SETUPDAEMON -- setup socket for daemon
1228 **
1229 **      Parameters:
1230 **              daemonaddr -- socket for daemon
1231 **
1232 **      Returns:
1233 **              port number on which daemon should run
1234 **
1235 */
1236
1237 static unsigned short
1238 setupdaemon(daemonaddr)
1239         SOCKADDR *daemonaddr;
1240 {
1241         unsigned short port;
1242
1243         /*
1244         **  Set up the address for the mailer.
1245         */
1246
1247         if (daemonaddr->sa.sa_family == AF_UNSPEC)
1248         {
1249                 memset(daemonaddr, '\0', sizeof(*daemonaddr));
1250 #if NETINET
1251                 daemonaddr->sa.sa_family = AF_INET;
1252 #endif /* NETINET */
1253         }
1254
1255         switch (daemonaddr->sa.sa_family)
1256         {
1257 #if NETINET
1258           case AF_INET:
1259                 if (daemonaddr->sin.sin_addr.s_addr == 0)
1260                         daemonaddr->sin.sin_addr.s_addr =
1261                             LocalDaemon ? htonl(INADDR_LOOPBACK) : INADDR_ANY;
1262                 port = daemonaddr->sin.sin_port;
1263                 break;
1264 #endif /* NETINET */
1265
1266 #if NETINET6
1267           case AF_INET6:
1268                 if (IN6_IS_ADDR_UNSPECIFIED(&daemonaddr->sin6.sin6_addr))
1269                         daemonaddr->sin6.sin6_addr =
1270                             LocalDaemon ? in6addr_loopback : in6addr_any;
1271                 port = daemonaddr->sin6.sin6_port;
1272                 break;
1273 #endif /* NETINET6 */
1274
1275           default:
1276                 /* unknown protocol */
1277                 port = 0;
1278                 break;
1279         }
1280         if (port == 0)
1281         {
1282 #ifdef NO_GETSERVBYNAME
1283                 port = htons(25);
1284 #else /* NO_GETSERVBYNAME */
1285                 {
1286                         register struct servent *sp;
1287
1288                         sp = getservbyname("smtp", "tcp");
1289                         if (sp == NULL)
1290                         {
1291                                 syserr("554 5.3.5 service \"smtp\" unknown");
1292                                 port = htons(25);
1293                         }
1294                         else
1295                                 port = sp->s_port;
1296                 }
1297 #endif /* NO_GETSERVBYNAME */
1298         }
1299
1300         switch (daemonaddr->sa.sa_family)
1301         {
1302 #if NETINET
1303           case AF_INET:
1304                 daemonaddr->sin.sin_port = port;
1305                 break;
1306 #endif /* NETINET */
1307
1308 #if NETINET6
1309           case AF_INET6:
1310                 daemonaddr->sin6.sin6_port = port;
1311                 break;
1312 #endif /* NETINET6 */
1313
1314           default:
1315                 /* unknown protocol */
1316                 break;
1317         }
1318         return port;
1319 }
1320 /*
1321 **  CLRDAEMON -- reset the daemon connection
1322 **
1323 **      Parameters:
1324 **              none.
1325 **
1326 **      Returns:
1327 **              none.
1328 **
1329 **      Side Effects:
1330 **              releases any resources used by the passive daemon.
1331 */
1332
1333 void
1334 clrdaemon()
1335 {
1336         int i;
1337
1338         for (i = 0; i < NDaemons; i++)
1339         {
1340                 if (Daemons[i].d_socket >= 0)
1341                         (void) close(Daemons[i].d_socket);
1342                 Daemons[i].d_socket = -1;
1343         }
1344 }
1345
1346 /*
1347 **  GETMODIFIERS -- get modifier flags
1348 **
1349 **      Parameters:
1350 **              v -- the modifiers (input text line).
1351 **              modifiers -- pointer to flag field to represent modifiers.
1352 **
1353 **      Returns:
1354 **              (xallocat()ed) string representation of modifiers.
1355 **
1356 **      Side Effects:
1357 **              fills in modifiers.
1358 */
1359
1360 char *
1361 getmodifiers(v, modifiers)
1362         char *v;
1363         BITMAP256 modifiers;
1364 {
1365         int l;
1366         char *h, *f, *flags;
1367
1368         /* maximum length of flags: upper case Option -> "OO " */
1369         l = 3 * strlen(v) + 3;
1370
1371         /* is someone joking? */
1372         if (l < 0 || l > 256)
1373         {
1374                 if (LogLevel > 2)
1375                         sm_syslog(LOG_ERR, NOQID,
1376                                   "getmodifiers too long, ignored");
1377                 return NULL;
1378         }
1379         flags = xalloc(l);
1380         f = flags;
1381         clrbitmap(modifiers);
1382         for (h = v; *h != '\0'; h++)
1383         {
1384                 if (isascii(*h) && !isspace(*h) && isprint(*h))
1385                 {
1386                         setbitn(*h, modifiers);
1387                         if (flags != f)
1388                                 *flags++ = ' ';
1389                         *flags++ = *h;
1390                         if (isupper(*h))
1391                                 *flags++ = *h;
1392                 }
1393         }
1394         *flags++ = '\0';
1395         return f;
1396 }
1397
1398 /*
1399 **  CHKDAEMONMODIFIERS -- check whether all daemons have set a flag.
1400 **
1401 **      Parameters:
1402 **              flag -- the flag to test.
1403 **
1404 **      Returns:
1405 **              true iff all daemons have set flag.
1406 */
1407
1408 bool
1409 chkdaemonmodifiers(flag)
1410         int flag;
1411 {
1412         int i;
1413
1414         for (i = 0; i < NDaemons; i++)
1415                 if (!bitnset((char) flag, Daemons[i].d_flags))
1416                         return false;
1417         return true;
1418 }
1419
1420 /*
1421 **  SETSOCKADDROPTIONS -- set options for SOCKADDR (daemon or client)
1422 **
1423 **      Parameters:
1424 **              p -- the options line.
1425 **              d -- the daemon structure to fill in.
1426 **
1427 **      Returns:
1428 **              none.
1429 */
1430
1431 static void
1432 setsockaddroptions(p, d)
1433         char *p;
1434         DAEMON_T *d;
1435 {
1436 #if NETISO
1437         short portno;
1438 #endif /* NETISO */
1439         char *port = NULL;
1440         char *addr = NULL;
1441
1442 #if NETINET
1443         if (d->d_addr.sa.sa_family == AF_UNSPEC)
1444                 d->d_addr.sa.sa_family = AF_INET;
1445 #endif /* NETINET */
1446 #if _FFR_SS_PER_DAEMON
1447         d->d_supersafe = DPO_NOTSET;
1448 #endif /* _FFR_SS_PER_DAEMON */
1449         d->d_dm = DM_NOTSET;
1450         d->d_refuseLA = DPO_NOTSET;
1451         d->d_queueLA = DPO_NOTSET;
1452         d->d_delayLA = DPO_NOTSET;
1453         d->d_maxchildren = DPO_NOTSET;
1454
1455         while (p != NULL)
1456         {
1457                 register char *f;
1458                 register char *v;
1459
1460                 while (isascii(*p) && isspace(*p))
1461                         p++;
1462                 if (*p == '\0')
1463                         break;
1464                 f = p;
1465                 p = strchr(p, ',');
1466                 if (p != NULL)
1467                         *p++ = '\0';
1468                 v = strchr(f, '=');
1469                 if (v == NULL)
1470                         continue;
1471                 while (isascii(*++v) && isspace(*v))
1472                         continue;
1473
1474                 switch (*f)
1475                 {
1476                   case 'A':             /* address */
1477 #if !_FFR_DPO_CS
1478                   case 'a':
1479 #endif /* !_FFR_DPO_CS */
1480                         addr = v;
1481                         break;
1482
1483                   case 'c':
1484                         d->d_maxchildren = atoi(v);
1485                         break;
1486
1487                   case 'D':             /* DeliveryMode */
1488                         switch (*v)
1489                         {
1490                           case SM_QUEUE:
1491                           case SM_DEFER:
1492                           case SM_DELIVER:
1493                           case SM_FORK:
1494                                 d->d_dm = *v;
1495                                 break;
1496                           default:
1497                                 syserr("554 5.3.5 Unknown delivery mode %c",
1498                                         *v);
1499                                 break;
1500                         }
1501                         break;
1502
1503                   case 'd':             /* delayLA */
1504                         d->d_delayLA = atoi(v);
1505                         break;
1506
1507                   case 'F':             /* address family */
1508 #if !_FFR_DPO_CS
1509                   case 'f':
1510 #endif /* !_FFR_DPO_CS */
1511                         if (isascii(*v) && isdigit(*v))
1512                                 d->d_addr.sa.sa_family = atoi(v);
1513 #if _FFR_DAEMON_NETUNIX
1514 # ifdef NETUNIX
1515                         else if (sm_strcasecmp(v, "unix") == 0 ||
1516                                  sm_strcasecmp(v, "local") == 0)
1517                                 d->d_addr.sa.sa_family = AF_UNIX;
1518 # endif /* NETUNIX */
1519 #endif /* _FFR_DAEMON_NETUNIX */
1520 #if NETINET
1521                         else if (sm_strcasecmp(v, "inet") == 0)
1522                                 d->d_addr.sa.sa_family = AF_INET;
1523 #endif /* NETINET */
1524 #if NETINET6
1525                         else if (sm_strcasecmp(v, "inet6") == 0)
1526                                 d->d_addr.sa.sa_family = AF_INET6;
1527 #endif /* NETINET6 */
1528 #if NETISO
1529                         else if (sm_strcasecmp(v, "iso") == 0)
1530                                 d->d_addr.sa.sa_family = AF_ISO;
1531 #endif /* NETISO */
1532 #if NETNS
1533                         else if (sm_strcasecmp(v, "ns") == 0)
1534                                 d->d_addr.sa.sa_family = AF_NS;
1535 #endif /* NETNS */
1536 #if NETX25
1537                         else if (sm_strcasecmp(v, "x.25") == 0)
1538                                 d->d_addr.sa.sa_family = AF_CCITT;
1539 #endif /* NETX25 */
1540                         else
1541                                 syserr("554 5.3.5 Unknown address family %s in Family=option",
1542                                        v);
1543                         break;
1544
1545 #if MILTER
1546                   case 'I':
1547 # if !_FFR_DPO_CS
1548                   case 'i':
1549 # endif /* !_FFR_DPO_CS */
1550                         d->d_inputfilterlist = v;
1551                         break;
1552 #endif /* MILTER */
1553
1554                   case 'L':             /* listen queue size */
1555 #if !_FFR_DPO_CS
1556                   case 'l':
1557 #endif /* !_FFR_DPO_CS */
1558                         d->d_listenqueue = atoi(v);
1559                         break;
1560
1561                   case 'M':             /* modifiers (flags) */
1562 #if !_FFR_DPO_CS
1563                   case 'm':
1564 #endif /* !_FFR_DPO_CS */
1565                         d->d_mflags = getmodifiers(v, d->d_flags);
1566                         break;
1567
1568                   case 'N':             /* name */
1569 #if !_FFR_DPO_CS
1570                   case 'n':
1571 #endif /* !_FFR_DPO_CS */
1572                         d->d_name = v;
1573                         break;
1574
1575                   case 'P':             /* port */
1576 #if !_FFR_DPO_CS
1577                   case 'p':
1578 #endif /* !_FFR_DPO_CS */
1579                         port = v;
1580                         break;
1581
1582                   case 'q':
1583                         d->d_queueLA = atoi(v);
1584                         break;
1585
1586                   case 'R':             /* receive buffer size */
1587                         d->d_tcprcvbufsize = atoi(v);
1588                         break;
1589
1590                   case 'r':
1591                         d->d_refuseLA = atoi(v);
1592                         break;
1593
1594                   case 'S':             /* send buffer size */
1595 #if !_FFR_DPO_CS
1596                   case 's':
1597 #endif /* !_FFR_DPO_CS */
1598                         d->d_tcpsndbufsize = atoi(v);
1599                         break;
1600
1601 #if _FFR_SS_PER_DAEMON
1602                   case 'T':             /* SuperSafe */
1603                         if (tolower(*v) == 'i')
1604                                 d->d_supersafe = SAFE_INTERACTIVE;
1605                         else if (tolower(*v) == 'p')
1606 # if MILTER
1607                                 d->d_supersafe = SAFE_REALLY_POSTMILTER;
1608 # else /* MILTER */
1609                                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
1610                                         "Warning: SuperSafe=PostMilter requires Milter support (-DMILTER)\n");
1611 # endif /* MILTER */
1612                         else
1613                                 d->d_supersafe = atobool(v) ? SAFE_REALLY
1614                                                         : SAFE_NO;
1615                         break;
1616 #endif /* _FFR_SS_PER_DAEMON */
1617
1618                   default:
1619                         syserr("554 5.3.5 PortOptions parameter \"%s\" unknown",
1620                                f);
1621                 }
1622         }
1623
1624         /* Check addr and port after finding family */
1625         if (addr != NULL)
1626         {
1627                 switch (d->d_addr.sa.sa_family)
1628                 {
1629 #if _FFR_DAEMON_NETUNIX
1630 # if NETUNIX
1631                   case AF_UNIX:
1632                         if (strlen(addr) >= sizeof(d->d_addr.sunix.sun_path))
1633                         {
1634                                 errno = ENAMETOOLONG;
1635                                 syserr("setsockaddroptions: domain socket name too long: %s > %d",
1636                                        addr, sizeof(d->d_addr.sunix.sun_path));
1637                                 break;
1638                         }
1639
1640                         /* file safety check done in opendaemonsocket() */
1641                         (void) memset(&d->d_addr.sunix.sun_path, '\0',
1642                                       sizeof(d->d_addr.sunix.sun_path));
1643                         (void) sm_strlcpy((char *)&d->d_addr.sunix.sun_path,
1644                                           addr,
1645                                           sizeof(d->d_addr.sunix.sun_path));
1646                         break;
1647 # endif /* NETUNIX */
1648 #endif  /* _FFR_DAEMON_NETUNIX */
1649 #if NETINET
1650                   case AF_INET:
1651                         if (!isascii(*addr) || !isdigit(*addr) ||
1652                             ((d->d_addr.sin.sin_addr.s_addr = inet_addr(addr))
1653                              == INADDR_NONE))
1654                         {
1655                                 register struct hostent *hp;
1656
1657                                 hp = sm_gethostbyname(addr, AF_INET);
1658                                 if (hp == NULL)
1659                                         syserr("554 5.3.0 host \"%s\" unknown",
1660                                                addr);
1661                                 else
1662                                 {
1663                                         while (*(hp->h_addr_list) != NULL &&
1664                                                hp->h_addrtype != AF_INET)
1665                                                 hp->h_addr_list++;
1666                                         if (*(hp->h_addr_list) == NULL)
1667                                                 syserr("554 5.3.0 host \"%s\" unknown",
1668                                                        addr);
1669                                         else
1670                                                 memmove(&d->d_addr.sin.sin_addr,
1671                                                         *(hp->h_addr_list),
1672                                                         INADDRSZ);
1673 # if NETINET6
1674                                         freehostent(hp);
1675                                         hp = NULL;
1676 # endif /* NETINET6 */
1677                                 }
1678                         }
1679                         break;
1680 #endif /* NETINET */
1681
1682 #if NETINET6
1683                   case AF_INET6:
1684                         if (anynet_pton(AF_INET6, addr,
1685                                         &d->d_addr.sin6.sin6_addr) != 1)
1686                         {
1687                                 register struct hostent *hp;
1688
1689                                 hp = sm_gethostbyname(addr, AF_INET6);
1690                                 if (hp == NULL)
1691                                         syserr("554 5.3.0 host \"%s\" unknown",
1692                                                addr);
1693                                 else
1694                                 {
1695                                         while (*(hp->h_addr_list) != NULL &&
1696                                                hp->h_addrtype != AF_INET6)
1697                                                 hp->h_addr_list++;
1698                                         if (*(hp->h_addr_list) == NULL)
1699                                                 syserr("554 5.3.0 host \"%s\" unknown",
1700                                                        addr);
1701                                         else
1702                                                 memmove(&d->d_addr.sin6.sin6_addr,
1703                                                         *(hp->h_addr_list),
1704                                                         IN6ADDRSZ);
1705                                         freehostent(hp);
1706                                         hp = NULL;
1707                                 }
1708                         }
1709                         break;
1710 #endif /* NETINET6 */
1711
1712                   default:
1713                         syserr("554 5.3.5 address= option unsupported for family %d",
1714                                d->d_addr.sa.sa_family);
1715                         break;
1716                 }
1717         }
1718
1719         if (port != NULL)
1720         {
1721                 switch (d->d_addr.sa.sa_family)
1722                 {
1723 #if NETINET
1724                   case AF_INET:
1725                         if (isascii(*port) && isdigit(*port))
1726                                 d->d_addr.sin.sin_port = htons((unsigned short)
1727                                                      atoi((const char *) port));
1728                         else
1729                         {
1730 # ifdef NO_GETSERVBYNAME
1731                                 syserr("554 5.3.5 invalid port number: %s",
1732                                        port);
1733 # else /* NO_GETSERVBYNAME */
1734                                 register struct servent *sp;
1735
1736                                 sp = getservbyname(port, "tcp");
1737                                 if (sp == NULL)
1738                                         syserr("554 5.3.5 service \"%s\" unknown",
1739                                                port);
1740                                 else
1741                                         d->d_addr.sin.sin_port = sp->s_port;
1742 # endif /* NO_GETSERVBYNAME */
1743                         }
1744                         break;
1745 #endif /* NETINET */
1746
1747 #if NETINET6
1748                   case AF_INET6:
1749                         if (isascii(*port) && isdigit(*port))
1750                                 d->d_addr.sin6.sin6_port = htons((unsigned short)
1751                                                                   atoi(port));
1752                         else
1753                         {
1754 # ifdef NO_GETSERVBYNAME
1755                                 syserr("554 5.3.5 invalid port number: %s",
1756                                        port);
1757 # else /* NO_GETSERVBYNAME */
1758                                 register struct servent *sp;
1759
1760                                 sp = getservbyname(port, "tcp");
1761                                 if (sp == NULL)
1762                                         syserr("554 5.3.5 service \"%s\" unknown",
1763                                                port);
1764                                 else
1765                                         d->d_addr.sin6.sin6_port = sp->s_port;
1766 # endif /* NO_GETSERVBYNAME */
1767                         }
1768                         break;
1769 #endif /* NETINET6 */
1770
1771 #if NETISO
1772                   case AF_ISO:
1773                         /* assume two byte transport selector */
1774                         if (isascii(*port) && isdigit(*port))
1775                                 portno = htons((unsigned short) atoi(port));
1776                         else
1777                         {
1778 # ifdef NO_GETSERVBYNAME
1779                                 syserr("554 5.3.5 invalid port number: %s",
1780                                        port);
1781 # else /* NO_GETSERVBYNAME */
1782                                 register struct servent *sp;
1783
1784                                 sp = getservbyname(port, "tcp");
1785                                 if (sp == NULL)
1786                                         syserr("554 5.3.5 service \"%s\" unknown",
1787                                                port);
1788                                 else
1789                                         portno = sp->s_port;
1790 # endif /* NO_GETSERVBYNAME */
1791                         }
1792                         memmove(TSEL(&d->d_addr.siso),
1793                                 (char *) &portno, 2);
1794                         break;
1795 #endif /* NETISO */
1796
1797                   default:
1798                         syserr("554 5.3.5 Port= option unsupported for family %d",
1799                                d->d_addr.sa.sa_family);
1800                         break;
1801                 }
1802         }
1803 }
1804 /*
1805 **  SETDAEMONOPTIONS -- set options for running the MTA daemon
1806 **
1807 **      Parameters:
1808 **              p -- the options line.
1809 **
1810 **      Returns:
1811 **              true if successful, false otherwise.
1812 **
1813 **      Side Effects:
1814 **              increments number of daemons.
1815 */
1816
1817 #define DEF_LISTENQUEUE 10
1818
1819 struct dflags
1820 {
1821         char    *d_name;
1822         int     d_flag;
1823 };
1824
1825 static struct dflags    DaemonFlags[] =
1826 {
1827         { "AUTHREQ",            D_AUTHREQ       },
1828         { "BINDIF",             D_BINDIF        },
1829         { "CANONREQ",           D_CANONREQ      },
1830         { "IFNHELO",            D_IFNHELO       },
1831         { "FQMAIL",             D_FQMAIL        },
1832         { "FQRCPT",             D_FQRCPT        },
1833         { "SMTPS",              D_SMTPS         },
1834         { "UNQUALOK",           D_UNQUALOK      },
1835         { "NOAUTH",             D_NOAUTH        },
1836         { "NOCANON",            D_NOCANON       },
1837         { "NOETRN",             D_NOETRN        },
1838         { "NOTLS",              D_NOTLS         },
1839         { "ETRNONLY",           D_ETRNONLY      },
1840         { "OPTIONAL",           D_OPTIONAL      },
1841         { "DISABLE",            D_DISABLE       },
1842         { "ISSET",              D_ISSET         },
1843         { NULL,                 0               }
1844 };
1845
1846 static void
1847 printdaemonflags(d)
1848         DAEMON_T *d;
1849 {
1850         register struct dflags *df;
1851         bool first = true;
1852
1853         for (df = DaemonFlags; df->d_name != NULL; df++)
1854         {
1855                 if (!bitnset(df->d_flag, d->d_flags))
1856                         continue;
1857                 if (first)
1858                         sm_dprintf("<%s", df->d_name);
1859                 else
1860                         sm_dprintf(",%s", df->d_name);
1861                 first = false;
1862         }
1863         if (!first)
1864                 sm_dprintf(">");
1865 }
1866
1867 bool
1868 setdaemonoptions(p)
1869         register char *p;
1870 {
1871         if (NDaemons >= MAXDAEMONS)
1872                 return false;
1873         Daemons[NDaemons].d_socket = -1;
1874         Daemons[NDaemons].d_listenqueue = DEF_LISTENQUEUE;
1875         clrbitmap(Daemons[NDaemons].d_flags);
1876         setsockaddroptions(p, &Daemons[NDaemons]);
1877
1878 #if MILTER
1879         if (Daemons[NDaemons].d_inputfilterlist != NULL)
1880                 Daemons[NDaemons].d_inputfilterlist = newstr(Daemons[NDaemons].d_inputfilterlist);
1881 #endif /* MILTER */
1882
1883         if (Daemons[NDaemons].d_name != NULL)
1884                 Daemons[NDaemons].d_name = newstr(Daemons[NDaemons].d_name);
1885         else
1886         {
1887                 char num[30];
1888
1889                 (void) sm_snprintf(num, sizeof(num), "Daemon%d", NDaemons);
1890                 Daemons[NDaemons].d_name = newstr(num);
1891         }
1892
1893         if (tTd(37, 1))
1894         {
1895                 sm_dprintf("Daemon %s flags: ", Daemons[NDaemons].d_name);
1896                 printdaemonflags(&Daemons[NDaemons]);
1897                 sm_dprintf("\n");
1898         }
1899         ++NDaemons;
1900         return true;
1901 }
1902 /*
1903 **  INITDAEMON -- initialize daemon if not yet done.
1904 **
1905 **      Parameters:
1906 **              none
1907 **
1908 **      Returns:
1909 **              none
1910 **
1911 **      Side Effects:
1912 **              initializes structure for one daemon.
1913 */
1914
1915 void
1916 initdaemon()
1917 {
1918         if (NDaemons == 0)
1919         {
1920                 Daemons[NDaemons].d_socket = -1;
1921                 Daemons[NDaemons].d_listenqueue = DEF_LISTENQUEUE;
1922                 Daemons[NDaemons].d_name = "Daemon0";
1923                 NDaemons = 1;
1924         }
1925 }
1926 /*
1927 **  SETCLIENTOPTIONS -- set options for running the client
1928 **
1929 **      Parameters:
1930 **              p -- the options line.
1931 **
1932 **      Returns:
1933 **              none.
1934 */
1935
1936 static DAEMON_T ClientSettings[AF_MAX + 1];
1937
1938 void
1939 setclientoptions(p)
1940         register char *p;
1941 {
1942         int family;
1943         DAEMON_T d;
1944
1945         memset(&d, '\0', sizeof(d));
1946         setsockaddroptions(p, &d);
1947
1948         /* grab what we need */
1949         family = d.d_addr.sa.sa_family;
1950         STRUCTCOPY(d, ClientSettings[family]);
1951         setbitn(D_ISSET, ClientSettings[family].d_flags); /* mark as set */
1952         if (d.d_name != NULL)
1953                 ClientSettings[family].d_name = newstr(d.d_name);
1954         else
1955         {
1956                 char num[30];
1957
1958                 (void) sm_snprintf(num, sizeof(num), "Client%d", family);
1959                 ClientSettings[family].d_name = newstr(num);
1960         }
1961 }
1962 /*
1963 **  ADDR_FAMILY -- determine address family from address
1964 **
1965 **      Parameters:
1966 **              addr -- the string representation of the address
1967 **
1968 **      Returns:
1969 **              AF_INET, AF_INET6 or AF_UNSPEC
1970 **
1971 **      Side Effects:
1972 **              none.
1973 */
1974
1975 static int
1976 addr_family(addr)
1977         char *addr;
1978 {
1979 #if NETINET6
1980         SOCKADDR clt_addr;
1981 #endif /* NETINET6 */
1982
1983 #if NETINET
1984         if (inet_addr(addr) != INADDR_NONE)
1985         {
1986                 if (tTd(16, 9))
1987                         sm_dprintf("addr_family(%s): INET\n", addr);
1988                 return AF_INET;
1989         }
1990 #endif /* NETINET */
1991 #if NETINET6
1992         if (anynet_pton(AF_INET6, addr, &clt_addr.sin6.sin6_addr) == 1)
1993         {
1994                 if (tTd(16, 9))
1995                         sm_dprintf("addr_family(%s): INET6\n", addr);
1996                 return AF_INET6;
1997         }
1998 #endif /* NETINET6 */
1999 #if _FFR_DAEMON_NETUNIX
2000 # if NETUNIX
2001         if (*addr == '/')
2002         {
2003                 if (tTd(16, 9))
2004                         sm_dprintf("addr_family(%s): LOCAL\n", addr);
2005                 return AF_UNIX;
2006         }
2007 # endif /* NETUNIX */
2008 #endif  /* _FFR_DAEMON_NETUNIX */
2009         if (tTd(16, 9))
2010                 sm_dprintf("addr_family(%s): UNSPEC\n", addr);
2011         return AF_UNSPEC;
2012 }
2013
2014 /*
2015 **  CHKCLIENTMODIFIERS -- check whether all clients have set a flag.
2016 **
2017 **      Parameters:
2018 **              flag -- the flag to test.
2019 **
2020 **      Returns:
2021 **              true iff all configured clients have set the flag.
2022 */
2023
2024 bool
2025 chkclientmodifiers(flag)
2026         int flag;
2027 {
2028         int i;
2029         bool flagisset;
2030
2031         flagisset = false;
2032         for (i = 0; i < AF_MAX; i++)
2033         {
2034                 if (bitnset(D_ISSET, ClientSettings[i].d_flags))
2035                 {
2036                         if (!bitnset((char) flag, ClientSettings[i].d_flags))
2037                                 return false;
2038                         flagisset = true;
2039                 }
2040         }
2041         return flagisset;
2042 }
2043
2044 #if MILTER
2045 /*
2046 **  SETUP_DAEMON_FILTERS -- Parse per-socket filters
2047 **
2048 **      Parameters:
2049 **              none
2050 **
2051 **      Returns:
2052 **              none
2053 */
2054
2055 void
2056 setup_daemon_milters()
2057 {
2058         int idx;
2059
2060         if (OpMode == MD_SMTP)
2061         {
2062                 /* no need to configure the daemons */
2063                 return;
2064         }
2065
2066         for (idx = 0; idx < NDaemons; idx++)
2067         {
2068                 if (Daemons[idx].d_inputfilterlist != NULL)
2069                 {
2070                         milter_config(Daemons[idx].d_inputfilterlist,
2071                                       Daemons[idx].d_inputfilters,
2072                                       MAXFILTERS);
2073                 }
2074         }
2075 }
2076 #endif /* MILTER */
2077 /*
2078 **  MAKECONNECTION -- make a connection to an SMTP socket on a machine.
2079 **
2080 **      Parameters:
2081 **              host -- the name of the host.
2082 **              port -- the port number to connect to.
2083 **              mci -- a pointer to the mail connection information
2084 **                      structure to be filled in.
2085 **              e -- the current envelope.
2086 **              enough -- time at which to stop further connection attempts.
2087 **                      (0 means no limit)
2088 **
2089 **      Returns:
2090 **              An exit code telling whether the connection could be
2091 **                      made and if not why not.
2092 **
2093 **      Side Effects:
2094 **              none.
2095 */
2096
2097 static jmp_buf  CtxConnectTimeout;
2098
2099 SOCKADDR        CurHostAddr;            /* address of current host */
2100
2101 int
2102 makeconnection(host, port, mci, e, enough)
2103         char *host;
2104         volatile unsigned int port;
2105         register MCI *mci;
2106         ENVELOPE *e;
2107         time_t enough;
2108 {
2109         register volatile int addrno = 0;
2110         volatile int s;
2111         register struct hostent *volatile hp = (struct hostent *) NULL;
2112         SOCKADDR addr;
2113         SOCKADDR clt_addr;
2114         int save_errno = 0;
2115         volatile SOCKADDR_LEN_T addrlen;
2116         volatile bool firstconnect = true;
2117         SM_EVENT *volatile ev = NULL;
2118 #if NETINET6
2119         volatile bool v6found = false;
2120 #endif /* NETINET6 */
2121         volatile int family = InetMode;
2122         SOCKADDR_LEN_T len;
2123         volatile SOCKADDR_LEN_T socksize = 0;
2124         volatile bool clt_bind;
2125         BITMAP256 d_flags;
2126         char *p;
2127         extern ENVELOPE BlankEnvelope;
2128
2129         /* retranslate {daemon_flags} into bitmap */
2130         clrbitmap(d_flags);
2131         if ((p = macvalue(macid("{daemon_flags}"), e)) != NULL)
2132         {
2133                 for (; *p != '\0'; p++)
2134                 {
2135                         if (!(isascii(*p) && isspace(*p)))
2136                                 setbitn(bitidx(*p), d_flags);
2137                 }
2138         }
2139
2140 #if NETINET6
2141  v4retry:
2142 #endif /* NETINET6 */
2143         clt_bind = false;
2144
2145         /* Set up the address for outgoing connection. */
2146         if (bitnset(D_BINDIF, d_flags) &&
2147             (p = macvalue(macid("{if_addr}"), e)) != NULL &&
2148             *p != '\0')
2149         {
2150 #if NETINET6
2151                 char p6[INET6_ADDRSTRLEN];
2152 #endif /* NETINET6 */
2153
2154                 memset(&clt_addr, '\0', sizeof(clt_addr));
2155
2156                 /* infer the address family from the address itself */
2157                 clt_addr.sa.sa_family = addr_family(p);
2158                 switch (clt_addr.sa.sa_family)
2159                 {
2160 #if NETINET
2161                   case AF_INET:
2162                         clt_addr.sin.sin_addr.s_addr = inet_addr(p);
2163                         if (clt_addr.sin.sin_addr.s_addr != INADDR_NONE &&
2164                             clt_addr.sin.sin_addr.s_addr != INADDR_LOOPBACK)
2165                         {
2166                                 clt_bind = true;
2167                                 socksize = sizeof(struct sockaddr_in);
2168                         }
2169                         break;
2170 #endif /* NETINET */
2171
2172 #if NETINET6
2173                   case AF_INET6:
2174                         if (inet_addr(p) != INADDR_NONE)
2175                                 (void) sm_snprintf(p6, sizeof(p6),
2176                                                    "IPv6:::ffff:%s", p);
2177                         else
2178                                 (void) sm_strlcpy(p6, p, sizeof(p6));
2179                         if (anynet_pton(AF_INET6, p6,
2180                                         &clt_addr.sin6.sin6_addr) == 1 &&
2181                             !IN6_IS_ADDR_LOOPBACK(&clt_addr.sin6.sin6_addr))
2182                         {
2183                                 clt_bind = true;
2184                                 socksize = sizeof(struct sockaddr_in6);
2185                         }
2186                         break;
2187 #endif /* NETINET6 */
2188
2189 #if 0
2190                   default:
2191                         syserr("554 5.3.5 Address= option unsupported for family %d",
2192                                clt_addr.sa.sa_family);
2193                         break;
2194 #endif /* 0 */
2195                 }
2196                 if (clt_bind)
2197                         family = clt_addr.sa.sa_family;
2198         }
2199
2200         /* D_BINDIF not set or not available, fallback to ClientPortOptions */
2201         if (!clt_bind)
2202         {
2203                 STRUCTCOPY(ClientSettings[family].d_addr, clt_addr);
2204                 switch (clt_addr.sa.sa_family)
2205                 {
2206 #if NETINET
2207                   case AF_INET:
2208                         if (clt_addr.sin.sin_addr.s_addr == 0)
2209                                 clt_addr.sin.sin_addr.s_addr = LocalDaemon ?
2210                                         htonl(INADDR_LOOPBACK) : INADDR_ANY;
2211                         else
2212                                 clt_bind = true;
2213                         if (clt_addr.sin.sin_port != 0)
2214                                 clt_bind = true;
2215                         socksize = sizeof(struct sockaddr_in);
2216                         break;
2217 #endif /* NETINET */
2218 #if NETINET6
2219                   case AF_INET6:
2220                         if (IN6_IS_ADDR_UNSPECIFIED(&clt_addr.sin6.sin6_addr))
2221                                 clt_addr.sin6.sin6_addr = LocalDaemon ?
2222                                         in6addr_loopback : in6addr_any;
2223                         else
2224                                 clt_bind = true;
2225                         socksize = sizeof(struct sockaddr_in6);
2226                         if (clt_addr.sin6.sin6_port != 0)
2227                                 clt_bind = true;
2228                         break;
2229 #endif /* NETINET6 */
2230 #if NETISO
2231                   case AF_ISO:
2232                         socksize = sizeof(clt_addr.siso);
2233                         clt_bind = true;
2234                         break;
2235 #endif /* NETISO */
2236                   default:
2237                         break;
2238                 }
2239         }
2240
2241         /*
2242         **  Set up the address for the mailer.
2243         **      Accept "[a.b.c.d]" syntax for host name.
2244         */
2245
2246         SM_SET_H_ERRNO(0);
2247         errno = 0;
2248         memset(&CurHostAddr, '\0', sizeof(CurHostAddr));
2249         memset(&addr, '\0', sizeof(addr));
2250         SmtpPhase = mci->mci_phase = "initial connection";
2251         CurHostName = host;
2252
2253         if (host[0] == '[')
2254         {
2255                 p = strchr(host, ']');
2256                 if (p != NULL)
2257                 {
2258 #if NETINET
2259                         unsigned long hid = INADDR_NONE;
2260 #endif /* NETINET */
2261 #if NETINET6
2262                         struct sockaddr_in6 hid6;
2263 #endif /* NETINET6 */
2264
2265                         *p = '\0';
2266 #if NETINET6
2267                         memset(&hid6, '\0', sizeof(hid6));
2268 #endif /* NETINET6 */
2269 #if NETINET
2270                         if (family == AF_INET &&
2271                             (hid = inet_addr(&host[1])) != INADDR_NONE)
2272                         {
2273                                 addr.sin.sin_family = AF_INET;
2274                                 addr.sin.sin_addr.s_addr = hid;
2275                         }
2276                         else
2277 #endif /* NETINET */
2278 #if NETINET6
2279                         if (family == AF_INET6 &&
2280                             anynet_pton(AF_INET6, &host[1],
2281                                         &hid6.sin6_addr) == 1)
2282                         {
2283                                 addr.sin6.sin6_family = AF_INET6;
2284                                 addr.sin6.sin6_addr = hid6.sin6_addr;
2285                         }
2286                         else
2287 #endif /* NETINET6 */
2288                         {
2289                                 /* try it as a host name (avoid MX lookup) */
2290                                 hp = sm_gethostbyname(&host[1], family);
2291                                 if (hp == NULL && p[-1] == '.')
2292                                 {
2293 #if NAMED_BIND
2294                                         int oldopts = _res.options;
2295
2296                                         _res.options &= ~(RES_DEFNAMES|RES_DNSRCH);
2297 #endif /* NAMED_BIND */
2298                                         p[-1] = '\0';
2299                                         hp = sm_gethostbyname(&host[1],
2300                                                               family);
2301                                         p[-1] = '.';
2302 #if NAMED_BIND
2303                                         _res.options = oldopts;
2304 #endif /* NAMED_BIND */
2305                                 }
2306                                 *p = ']';
2307                                 goto gothostent;
2308                         }
2309                         *p = ']';
2310                 }
2311                 if (p == NULL)
2312                 {
2313                         extern char MsgBuf[];
2314
2315                         usrerrenh("5.1.2",
2316                                   "553 Invalid numeric domain spec \"%s\"",
2317                                   host);
2318                         mci_setstat(mci, EX_NOHOST, "5.1.2", MsgBuf);
2319                         errno = EINVAL;
2320                         return EX_NOHOST;
2321                 }
2322         }
2323         else
2324         {
2325                 /* contortion to get around SGI cc complaints */
2326                 {
2327                         p = &host[strlen(host) - 1];
2328                         hp = sm_gethostbyname(host, family);
2329                         if (hp == NULL && *p == '.')
2330                         {
2331 #if NAMED_BIND
2332                                 int oldopts = _res.options;
2333
2334                                 _res.options &= ~(RES_DEFNAMES|RES_DNSRCH);
2335 #endif /* NAMED_BIND */
2336                                 *p = '\0';
2337                                 hp = sm_gethostbyname(host, family);
2338                                 *p = '.';
2339 #if NAMED_BIND
2340                                 _res.options = oldopts;
2341 #endif /* NAMED_BIND */
2342                         }
2343                 }
2344 gothostent:
2345                 if (hp == NULL)
2346                 {
2347 #if NAMED_BIND
2348                         /* check for name server timeouts */
2349 # if NETINET6
2350                         if (WorkAroundBrokenAAAA && family == AF_INET6 &&
2351                             errno == ETIMEDOUT)
2352                         {
2353                                 /*
2354                                 **  An attempt with family AF_INET may
2355                                 **  succeed By skipping the next section
2356                                 **  of code, we will try AF_INET before
2357                                 **  failing.
2358                                 */
2359
2360                                 if (tTd(16, 10))
2361                                         sm_dprintf("makeconnection: WorkAroundBrokenAAAA: Trying AF_INET lookup (AF_INET6 failed)\n");
2362                         }
2363                         else
2364 # endif /* NETINET6 */
2365                         {
2366                                 if (errno == ETIMEDOUT ||
2367 # if _FFR_GETHBN_ExFILE
2368 #  ifdef EMFILE
2369                                    errno == EMFILE ||
2370 #  endif /* EMFILE */
2371 #  ifdef ENFILE
2372                                    errno == ENFILE ||
2373 #  endif /* ENFILE */
2374 # endif /* _FFR_GETHBN_ExFILE */
2375                                     h_errno == TRY_AGAIN ||
2376                                     (errno == ECONNREFUSED && UseNameServer))
2377                                 {
2378                                         save_errno = errno;
2379                                         mci_setstat(mci, EX_TEMPFAIL,
2380                                                     "4.4.3", NULL);
2381                                         errno = save_errno;
2382                                         return EX_TEMPFAIL;
2383                                 }
2384                         }
2385 #endif /* NAMED_BIND */
2386 #if NETINET6
2387                         /*
2388                         **  Try v6 first, then fall back to v4.
2389                         **  If we found a v6 address, but no v4
2390                         **  addresses, then TEMPFAIL.
2391                         */
2392
2393                         if (family == AF_INET6)
2394                         {
2395                                 family = AF_INET;
2396                                 goto v4retry;
2397                         }
2398                         if (v6found)
2399                                 goto v6tempfail;
2400 #endif /* NETINET6 */
2401                         save_errno = errno;
2402                         mci_setstat(mci, EX_NOHOST, "5.1.2", NULL);
2403                         errno = save_errno;
2404                         return EX_NOHOST;
2405                 }
2406                 addr.sa.sa_family = hp->h_addrtype;
2407                 switch (hp->h_addrtype)
2408                 {
2409 #if NETINET
2410                   case AF_INET:
2411                         memmove(&addr.sin.sin_addr,
2412                                 hp->h_addr,
2413                                 INADDRSZ);
2414                         break;
2415 #endif /* NETINET */
2416
2417 #if NETINET6
2418                   case AF_INET6:
2419                         memmove(&addr.sin6.sin6_addr,
2420                                 hp->h_addr,
2421                                 IN6ADDRSZ);
2422                         break;
2423 #endif /* NETINET6 */
2424
2425                   default:
2426                         if (hp->h_length > sizeof(addr.sa.sa_data))
2427                         {
2428                                 syserr("makeconnection: long sa_data: family %d len %d",
2429                                         hp->h_addrtype, hp->h_length);
2430                                 mci_setstat(mci, EX_NOHOST, "5.1.2", NULL);
2431                                 errno = EINVAL;
2432                                 return EX_NOHOST;
2433                         }
2434                         memmove(addr.sa.sa_data, hp->h_addr, hp->h_length);
2435                         break;
2436                 }
2437                 addrno = 1;
2438         }
2439
2440         /*
2441         **  Determine the port number.
2442         */
2443
2444         if (port == 0)
2445         {
2446 #ifdef NO_GETSERVBYNAME
2447                 port = htons(25);
2448 #else /* NO_GETSERVBYNAME */
2449                 register struct servent *sp = getservbyname("smtp", "tcp");
2450
2451                 if (sp == NULL)
2452                 {
2453                         if (LogLevel > 2)
2454                                 sm_syslog(LOG_ERR, NOQID,
2455                                           "makeconnection: service \"smtp\" unknown");
2456                         port = htons(25);
2457                 }
2458                 else
2459                         port = sp->s_port;
2460 #endif /* NO_GETSERVBYNAME */
2461         }
2462
2463 #if NETINET6
2464         if (addr.sa.sa_family == AF_INET6 &&
2465             IN6_IS_ADDR_V4MAPPED(&addr.sin6.sin6_addr) &&
2466             ClientSettings[AF_INET].d_addr.sa.sa_family != 0)
2467         {
2468                 /*
2469                 **  Ignore mapped IPv4 address since
2470                 **  there is a ClientPortOptions setting
2471                 **  for IPv4.
2472                 */
2473
2474                 goto nextaddr;
2475         }
2476 #endif /* NETINET6 */
2477
2478         switch (addr.sa.sa_family)
2479         {
2480 #if NETINET
2481           case AF_INET:
2482                 addr.sin.sin_port = port;
2483                 addrlen = sizeof(struct sockaddr_in);
2484                 break;
2485 #endif /* NETINET */
2486
2487 #if NETINET6
2488           case AF_INET6:
2489                 addr.sin6.sin6_port = port;
2490                 addrlen = sizeof(struct sockaddr_in6);
2491                 break;
2492 #endif /* NETINET6 */
2493
2494 #if NETISO
2495           case AF_ISO:
2496                 /* assume two byte transport selector */
2497                 memmove(TSEL((struct sockaddr_iso *) &addr), (char *) &port, 2);
2498                 addrlen = sizeof(struct sockaddr_iso);
2499                 break;
2500 #endif /* NETISO */
2501
2502           default:
2503                 syserr("Can't connect to address family %d", addr.sa.sa_family);
2504                 mci_setstat(mci, EX_NOHOST, "5.1.2", NULL);
2505                 errno = EINVAL;
2506 #if NETINET6
2507                 if (hp != NULL)
2508                         freehostent(hp);
2509 #endif /* NETINET6 */
2510                 return EX_NOHOST;
2511         }
2512
2513         /*
2514         **  Try to actually open the connection.
2515         */
2516
2517 #if XLA
2518         /* if too many connections, don't bother trying */
2519         if (!xla_noqueue_ok(host))
2520         {
2521 # if NETINET6
2522                 if (hp != NULL)
2523                         freehostent(hp);
2524 # endif /* NETINET6 */
2525                 return EX_TEMPFAIL;
2526         }
2527 #endif /* XLA */
2528
2529         for (;;)
2530         {
2531                 if (tTd(16, 1))
2532                         sm_dprintf("makeconnection (%s [%s].%d (%d))\n",
2533                                    host, anynet_ntoa(&addr), ntohs(port),
2534                                    (int) addr.sa.sa_family);
2535
2536                 /* save for logging */
2537                 CurHostAddr = addr;
2538
2539 #if HASRRESVPORT
2540                 if (bitnset(M_SECURE_PORT, mci->mci_mailer->m_flags))
2541                 {
2542                         int rport = IPPORT_RESERVED - 1;
2543
2544                         s = rresvport(&rport);
2545                 }
2546                 else
2547 #endif /* HASRRESVPORT */
2548                 {
2549                         s = socket(addr.sa.sa_family, SOCK_STREAM, 0);
2550                 }
2551                 if (s < 0)
2552                 {
2553                         save_errno = errno;
2554                         syserr("makeconnection: cannot create socket");
2555 #if XLA
2556                         xla_host_end(host);
2557 #endif /* XLA */
2558                         mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2559 #if NETINET6
2560                         if (hp != NULL)
2561                                 freehostent(hp);
2562 #endif /* NETINET6 */
2563                         errno = save_errno;
2564                         return EX_TEMPFAIL;
2565                 }
2566
2567 #ifdef SO_SNDBUF
2568                 if (ClientSettings[family].d_tcpsndbufsize > 0)
2569                 {
2570                         if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
2571                                        (char *) &ClientSettings[family].d_tcpsndbufsize,
2572                                        sizeof(ClientSettings[family].d_tcpsndbufsize)) < 0)
2573                                 syserr("makeconnection: setsockopt(SO_SNDBUF)");
2574                 }
2575 #endif /* SO_SNDBUF */
2576 #ifdef SO_RCVBUF
2577                 if (ClientSettings[family].d_tcprcvbufsize > 0)
2578                 {
2579                         if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
2580                                        (char *) &ClientSettings[family].d_tcprcvbufsize,
2581                                        sizeof(ClientSettings[family].d_tcprcvbufsize)) < 0)
2582                                 syserr("makeconnection: setsockopt(SO_RCVBUF)");
2583                 }
2584 #endif /* SO_RCVBUF */
2585
2586                 if (tTd(16, 1))
2587                         sm_dprintf("makeconnection: fd=%d\n", s);
2588
2589                 /* turn on network debugging? */
2590                 if (tTd(16, 101))
2591                 {
2592                         int on = 1;
2593
2594                         (void) setsockopt(s, SOL_SOCKET, SO_DEBUG,
2595                                           (char *)&on, sizeof(on));
2596                 }
2597                 if (e->e_xfp != NULL)   /* for debugging */
2598                         (void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
2599                 errno = 0;              /* for debugging */
2600
2601                 if (clt_bind)
2602                 {
2603                         int on = 1;
2604
2605                         switch (clt_addr.sa.sa_family)
2606                         {
2607 #if NETINET
2608                           case AF_INET:
2609                                 if (clt_addr.sin.sin_port != 0)
2610                                         (void) setsockopt(s, SOL_SOCKET,
2611                                                           SO_REUSEADDR,
2612                                                           (char *) &on,
2613                                                           sizeof(on));
2614                                 break;
2615 #endif /* NETINET */
2616
2617 #if NETINET6
2618                           case AF_INET6:
2619                                 if (clt_addr.sin6.sin6_port != 0)
2620                                         (void) setsockopt(s, SOL_SOCKET,
2621                                                           SO_REUSEADDR,
2622                                                           (char *) &on,
2623                                                           sizeof(on));
2624                                 break;
2625 #endif /* NETINET6 */
2626                         }
2627
2628                         if (bind(s, &clt_addr.sa, socksize) < 0)
2629                         {
2630                                 save_errno = errno;
2631                                 (void) close(s);
2632                                 errno = save_errno;
2633                                 syserr("makeconnection: cannot bind socket [%s]",
2634                                        anynet_ntoa(&clt_addr));
2635 #if NETINET6
2636                                 if (hp != NULL)
2637                                         freehostent(hp);
2638 #endif /* NETINET6 */
2639                                 errno = save_errno;
2640                                 return EX_TEMPFAIL;
2641                         }
2642                 }
2643
2644                 /*
2645                 **  Linux seems to hang in connect for 90 minutes (!!!).
2646                 **  Time out the connect to avoid this problem.
2647                 */
2648
2649                 if (setjmp(CtxConnectTimeout) == 0)
2650                 {
2651                         int i;
2652
2653                         if (e->e_ntries <= 0 && TimeOuts.to_iconnect != 0)
2654                                 ev = sm_setevent(TimeOuts.to_iconnect,
2655                                                  connecttimeout, 0);
2656                         else if (TimeOuts.to_connect != 0)
2657                                 ev = sm_setevent(TimeOuts.to_connect,
2658                                                  connecttimeout, 0);
2659                         else
2660                                 ev = NULL;
2661
2662                         switch (ConnectOnlyTo.sa.sa_family)
2663                         {
2664 #if NETINET
2665                           case AF_INET:
2666                                 addr.sin.sin_addr.s_addr = ConnectOnlyTo.sin.sin_addr.s_addr;
2667                                 break;
2668 #endif /* NETINET */
2669
2670 #if NETINET6
2671                           case AF_INET6:
2672                                 memmove(&addr.sin6.sin6_addr,
2673                                         &ConnectOnlyTo.sin6.sin6_addr,
2674                                         IN6ADDRSZ);
2675                                 break;
2676 #endif /* NETINET6 */
2677                         }
2678                         if (tTd(16, 1))
2679                                 sm_dprintf("Connecting to [%s]...\n", anynet_ntoa(&addr));
2680                         i = connect(s, (struct sockaddr *) &addr, addrlen);
2681                         save_errno = errno;
2682                         if (ev != NULL)
2683                                 sm_clrevent(ev);
2684                         if (i >= 0)
2685                                 break;
2686                 }
2687                 else
2688                         save_errno = errno;
2689
2690                 /* couldn't connect.... figure out why */
2691                 (void) close(s);
2692
2693                 /* if running demand-dialed connection, try again */
2694                 if (DialDelay > 0 && firstconnect &&
2695                     bitnset(M_DIALDELAY, mci->mci_mailer->m_flags))
2696                 {
2697                         if (tTd(16, 1))
2698                                 sm_dprintf("Connect failed (%s); trying again...\n",
2699                                            sm_errstring(save_errno));
2700                         firstconnect = false;
2701                         (void) sleep(DialDelay);
2702                         continue;
2703                 }
2704
2705                 if (LogLevel > 13)
2706                         sm_syslog(LOG_INFO, e->e_id,
2707                                   "makeconnection (%s [%s]) failed: %s",
2708                                   host, anynet_ntoa(&addr),
2709                                   sm_errstring(save_errno));
2710
2711 #if NETINET6
2712 nextaddr:
2713 #endif /* NETINET6 */
2714                 if (hp != NULL && hp->h_addr_list[addrno] != NULL &&
2715                     (enough == 0 || curtime() < enough))
2716                 {
2717                         if (tTd(16, 1))
2718                                 sm_dprintf("Connect failed (%s); trying new address....\n",
2719                                            sm_errstring(save_errno));
2720                         switch (addr.sa.sa_family)
2721                         {
2722 #if NETINET
2723                           case AF_INET:
2724                                 memmove(&addr.sin.sin_addr,
2725                                         hp->h_addr_list[addrno++],
2726                                         INADDRSZ);
2727                                 break;
2728 #endif /* NETINET */
2729
2730 #if NETINET6
2731                           case AF_INET6:
2732                                 memmove(&addr.sin6.sin6_addr,
2733                                         hp->h_addr_list[addrno++],
2734                                         IN6ADDRSZ);
2735                                 break;
2736 #endif /* NETINET6 */
2737
2738                           default:
2739                                 memmove(addr.sa.sa_data,
2740                                         hp->h_addr_list[addrno++],
2741                                         hp->h_length);
2742                                 break;
2743                         }
2744                         continue;
2745                 }
2746                 errno = save_errno;
2747
2748 #if NETINET6
2749                 if (family == AF_INET6)
2750                 {
2751                         if (tTd(16, 1))
2752                                 sm_dprintf("Connect failed (%s); retrying with AF_INET....\n",
2753                                            sm_errstring(save_errno));
2754                         v6found = true;
2755                         family = AF_INET;
2756                         if (hp != NULL)
2757                         {
2758                                 freehostent(hp);
2759                                 hp = NULL;
2760                         }
2761                         goto v4retry;
2762                 }
2763         v6tempfail:
2764 #endif /* NETINET6 */
2765                 /* couldn't open connection */
2766 #if NETINET6
2767                 /* Don't clobber an already saved errno from v4retry */
2768                 if (errno > 0)
2769 #endif /* NETINET6 */
2770                         save_errno = errno;
2771                 if (tTd(16, 1))
2772                         sm_dprintf("Connect failed (%s)\n",
2773                                    sm_errstring(save_errno));
2774 #if XLA
2775                 xla_host_end(host);
2776 #endif /* XLA */
2777                 mci_setstat(mci, EX_TEMPFAIL, "4.4.1", NULL);
2778 #if NETINET6
2779                 if (hp != NULL)
2780                         freehostent(hp);
2781 #endif /* NETINET6 */
2782                 errno = save_errno;
2783                 return EX_TEMPFAIL;
2784         }
2785
2786 #if NETINET6
2787         if (hp != NULL)
2788         {
2789                 freehostent(hp);
2790                 hp = NULL;
2791         }
2792 #endif /* NETINET6 */
2793
2794         /* connection ok, put it into canonical form */
2795         mci->mci_out = NULL;
2796         if ((mci->mci_out = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2797                                        (void *) &s,
2798                                        SM_IO_WRONLY_B, NULL)) == NULL ||
2799             (s = dup(s)) < 0 ||
2800             (mci->mci_in = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2801                                       (void *) &s,
2802                                       SM_IO_RDONLY_B, NULL)) == NULL)
2803         {
2804                 save_errno = errno;
2805                 syserr("cannot open SMTP client channel, fd=%d", s);
2806                 mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2807                 if (mci->mci_out != NULL)
2808                         (void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT);
2809                 (void) close(s);
2810                 errno = save_errno;
2811                 return EX_TEMPFAIL;
2812         }
2813         sm_io_automode(mci->mci_out, mci->mci_in);
2814
2815         /* set {client_flags} */
2816         if (ClientSettings[addr.sa.sa_family].d_mflags != NULL)
2817         {
2818                 macdefine(&mci->mci_macro, A_PERM,
2819                           macid("{client_flags}"),
2820                           ClientSettings[addr.sa.sa_family].d_mflags);
2821         }
2822         else
2823                 macdefine(&mci->mci_macro, A_PERM,
2824                           macid("{client_flags}"), "");
2825
2826         /* "add" {client_flags} to bitmap */
2827         if (bitnset(D_IFNHELO, ClientSettings[addr.sa.sa_family].d_flags))
2828         {
2829                 /* look for just this one flag */
2830                 setbitn(D_IFNHELO, d_flags);
2831         }
2832
2833         /* find out name for Interface through which we connect */
2834         len = sizeof(addr);
2835         if (getsockname(s, &addr.sa, &len) == 0)
2836         {
2837                 char *name;
2838                 char family[5];
2839
2840                 macdefine(&BlankEnvelope.e_macro, A_TEMP,
2841                         macid("{if_addr_out}"), anynet_ntoa(&addr));
2842                 (void) sm_snprintf(family, sizeof(family), "%d",
2843                         addr.sa.sa_family);
2844                 macdefine(&BlankEnvelope.e_macro, A_TEMP,
2845                         macid("{if_family_out}"), family);
2846
2847                 name = hostnamebyanyaddr(&addr);
2848                 macdefine(&BlankEnvelope.e_macro, A_TEMP,
2849                         macid("{if_name_out}"), name);
2850                 if (LogLevel > 11)
2851                 {
2852                         /* log connection information */
2853                         sm_syslog(LOG_INFO, e->e_id,
2854                                   "SMTP outgoing connect on %.40s", name);
2855                 }
2856                 if (bitnset(D_IFNHELO, d_flags))
2857                 {
2858                         if (name[0] != '[' && strchr(name, '.') != NULL)
2859                                 mci->mci_heloname = newstr(name);
2860                 }
2861         }
2862         else
2863         {
2864                 macdefine(&BlankEnvelope.e_macro, A_PERM,
2865                         macid("{if_name_out}"), NULL);
2866                 macdefine(&BlankEnvelope.e_macro, A_PERM,
2867                         macid("{if_addr_out}"), NULL);
2868                 macdefine(&BlankEnvelope.e_macro, A_PERM,
2869                         macid("{if_family_out}"), NULL);
2870         }
2871
2872         /* Use the configured HeloName as appropriate */
2873         if (HeloName != NULL && HeloName[0] != '\0')
2874                 mci->mci_heloname = newstr(HeloName);
2875
2876         mci_setstat(mci, EX_OK, NULL, NULL);
2877         return EX_OK;
2878 }
2879
2880 static void
2881 connecttimeout(ignore)
2882         int ignore;
2883 {
2884         /*
2885         **  NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
2886         **      ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
2887         **      DOING.
2888         */
2889
2890         errno = ETIMEDOUT;
2891         longjmp(CtxConnectTimeout, 1);
2892 }
2893 /*
2894 **  MAKECONNECTION_DS -- make a connection to a domain socket.
2895 **
2896 **      Parameters:
2897 **              mux_path -- the path of the socket to connect to.
2898 **              mci -- a pointer to the mail connection information
2899 **                      structure to be filled in.
2900 **
2901 **      Returns:
2902 **              An exit code telling whether the connection could be
2903 **                      made and if not why not.
2904 **
2905 **      Side Effects:
2906 **              none.
2907 */
2908
2909 #if NETUNIX
2910 int
2911 makeconnection_ds(mux_path, mci)
2912         char *mux_path;
2913         register MCI *mci;
2914 {
2915         int sock;
2916         int rval, save_errno;
2917         long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_ROOTOK|SFF_EXECOK;
2918         struct sockaddr_un unix_addr;
2919
2920         /* if not safe, don't connect */
2921         rval = safefile(mux_path, RunAsUid, RunAsGid, RunAsUserName,
2922                         sff, S_IRUSR|S_IWUSR, NULL);
2923
2924         if (rval != 0)
2925         {
2926                 syserr("makeconnection_ds: unsafe domain socket %s",
2927                         mux_path);
2928                 mci_setstat(mci, EX_TEMPFAIL, "4.3.5", NULL);
2929                 errno = rval;
2930                 return EX_TEMPFAIL;
2931         }
2932
2933         /* prepare address structure */
2934         memset(&unix_addr, '\0', sizeof(unix_addr));
2935         unix_addr.sun_family = AF_UNIX;
2936
2937         if (strlen(mux_path) >= sizeof(unix_addr.sun_path))
2938         {
2939                 syserr("makeconnection_ds: domain socket name %s too long",
2940                         mux_path);
2941
2942                 /* XXX why TEMPFAIL but 5.x.y ? */
2943                 mci_setstat(mci, EX_TEMPFAIL, "5.3.5", NULL);
2944                 errno = ENAMETOOLONG;
2945                 return EX_UNAVAILABLE;
2946         }
2947         (void) sm_strlcpy(unix_addr.sun_path, mux_path,
2948                           sizeof(unix_addr.sun_path));
2949
2950         /* initialize domain socket */
2951         sock = socket(AF_UNIX, SOCK_STREAM, 0);
2952         if (sock == -1)
2953         {
2954                 save_errno = errno;
2955                 syserr("makeconnection_ds: could not create domain socket %s",
2956                         mux_path);
2957                 mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2958                 errno = save_errno;
2959                 return EX_TEMPFAIL;
2960         }
2961
2962         /* connect to server */
2963         if (connect(sock, (struct sockaddr *) &unix_addr,
2964                     sizeof(unix_addr)) == -1)
2965         {
2966                 save_errno = errno;
2967                 syserr("Could not connect to socket %s", mux_path);
2968                 mci_setstat(mci, EX_TEMPFAIL, "4.4.1", NULL);
2969                 (void) close(sock);
2970                 errno = save_errno;
2971                 return EX_TEMPFAIL;
2972         }
2973
2974         /* connection ok, put it into canonical form */
2975         mci->mci_out = NULL;
2976         if ((mci->mci_out = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2977                                        (void *) &sock, SM_IO_WRONLY_B, NULL))
2978                                         == NULL
2979             || (sock = dup(sock)) < 0 ||
2980             (mci->mci_in = sm_io_open(SmFtStdiofd, SM_TIME_DEFAULT,
2981                                       (void *) &sock, SM_IO_RDONLY_B, NULL))
2982                                         == NULL)
2983         {
2984                 save_errno = errno;
2985                 syserr("cannot open SMTP client channel, fd=%d", sock);
2986                 mci_setstat(mci, EX_TEMPFAIL, "4.4.5", NULL);
2987                 if (mci->mci_out != NULL)
2988                         (void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT);
2989                 (void) close(sock);
2990                 errno = save_errno;
2991                 return EX_TEMPFAIL;
2992         }
2993         sm_io_automode(mci->mci_out, mci->mci_in);
2994
2995         mci_setstat(mci, EX_OK, NULL, NULL);
2996         errno = 0;
2997         return EX_OK;
2998 }
2999 #endif /* NETUNIX */
3000 /*
3001 **  SHUTDOWN_DAEMON -- Performs a clean shutdown of the daemon
3002 **
3003 **      Parameters:
3004 **              none.
3005 **
3006 **      Returns:
3007 **              none.
3008 **
3009 **      Side Effects:
3010 **              closes control socket, exits.
3011 */
3012
3013 void
3014 shutdown_daemon()
3015 {
3016         int i;
3017         char *reason;
3018
3019         sm_allsignals(true);
3020
3021         reason = ShutdownRequest;
3022         ShutdownRequest = NULL;
3023         PendingSignal = 0;
3024
3025         if (LogLevel > 9)
3026                 sm_syslog(LOG_INFO, CurEnv->e_id, "stopping daemon, reason=%s",
3027                           reason == NULL ? "implicit call" : reason);
3028
3029         FileName = NULL;
3030         closecontrolsocket(true);
3031 #if XLA
3032         xla_all_end();
3033 #endif /* XLA */
3034
3035         for (i = 0; i < NDaemons; i++)
3036         {
3037                 if (Daemons[i].d_socket >= 0)
3038                 {
3039                         (void) close(Daemons[i].d_socket);
3040                         Daemons[i].d_socket = -1;
3041
3042 #if _FFR_DAEMON_NETUNIX
3043 # if NETUNIX
3044                         /* Remove named sockets */
3045                         if (Daemons[i].d_addr.sa.sa_family == AF_UNIX)
3046                         {
3047                                 int rval;
3048                                 long sff = SFF_SAFEDIRPATH|SFF_OPENASROOT|SFF_NOLINK|SFF_MUSTOWN|SFF_EXECOK|SFF_CREAT;
3049
3050                                 /* if not safe, don't use it */
3051                                 rval = safefile(Daemons[i].d_addr.sunix.sun_path,
3052                                                 RunAsUid, RunAsGid,
3053                                                 RunAsUserName, sff,
3054                                                 S_IRUSR|S_IWUSR, NULL);
3055                                 if (rval == 0 &&
3056                                     unlink(Daemons[i].d_addr.sunix.sun_path) < 0)
3057                                 {
3058                                         sm_syslog(LOG_WARNING, NOQID,
3059                                                   "Could not remove daemon %s socket: %s: %s",
3060                                                   Daemons[i].d_name,
3061                                                   Daemons[i].d_addr.sunix.sun_path,
3062                                                   sm_errstring(errno));
3063                                 }
3064                         }
3065 # endif /* NETUNIX */
3066 #endif  /* _FFR_DAEMON_NETUNIX */
3067                 }
3068         }
3069
3070         finis(false, true, EX_OK);
3071 }
3072 /*
3073 **  RESTART_DAEMON -- Performs a clean restart of the daemon
3074 **
3075 **      Parameters:
3076 **              none.
3077 **
3078 **      Returns:
3079 **              none.
3080 **
3081 **      Side Effects:
3082 **              restarts the daemon or exits if restart fails.
3083 */
3084
3085 /* Make a non-DFL/IGN signal a noop */
3086 #define SM_NOOP_SIGNAL(sig, old)                                \
3087 do                                                              \
3088 {                                                               \
3089         (old) = sm_signal((sig), sm_signal_noop);               \
3090         if ((old) == SIG_IGN || (old) == SIG_DFL)               \
3091                 (void) sm_signal((sig), (old));                 \
3092 } while (0)
3093
3094 void
3095 restart_daemon()
3096 {
3097         bool drop;
3098         int save_errno;
3099         char *reason;
3100         sigfunc_t ignore, oalrm, ousr1;
3101         extern int DtableSize;
3102
3103         /* clear the events to turn off SIGALRMs */
3104         sm_clear_events();
3105         sm_allsignals(true);
3106
3107         reason = RestartRequest;
3108         RestartRequest = NULL;
3109         PendingSignal = 0;
3110
3111         if (SaveArgv[0][0] != '/')
3112         {
3113                 if (LogLevel > 3)
3114                         sm_syslog(LOG_INFO, NOQID,
3115                                   "could not restart: need full path");
3116                 finis(false, true, EX_OSFILE);
3117                 /* NOTREACHED */
3118         }
3119         if (LogLevel > 3)
3120                 sm_syslog(LOG_INFO, NOQID, "restarting %s due to %s",
3121                           SaveArgv[0],
3122                           reason == NULL ? "implicit call" : reason);
3123
3124         closecontrolsocket(true);
3125 #if SM_CONF_SHM
3126         cleanup_shm(DaemonPid == getpid());
3127 #endif /* SM_CONF_SHM */
3128
3129         /* close locked pid file */
3130         close_sendmail_pid();
3131
3132         /*
3133         **  Want to drop to the user who started the process in all cases
3134         **  *but* when running as "smmsp" for the clientmqueue queue run
3135         **  daemon.  In that case, UseMSP will be true, RunAsUid should not
3136         **  be root, and RealUid should be either 0 or RunAsUid.
3137         */
3138
3139         drop = !(UseMSP && RunAsUid != 0 &&
3140                  (RealUid == 0 || RealUid == RunAsUid));
3141
3142         if (drop_privileges(drop) != EX_OK)
3143         {
3144                 if (LogLevel > 0)
3145                         sm_syslog(LOG_ALERT, NOQID,
3146                                   "could not drop privileges: %s",
3147                                   sm_errstring(errno));
3148                 finis(false, true, EX_OSERR);
3149                 /* NOTREACHED */
3150         }
3151
3152         sm_close_on_exec(STDERR_FILENO + 1, DtableSize);
3153
3154         /*
3155         **  Need to allow signals before execve() to make them "harmless".
3156         **  However, the default action can be "terminate", so it isn't
3157         **  really harmless.  Setting signals to IGN will cause them to be
3158         **  ignored in the new process to, so that isn't a good alternative.
3159         */
3160
3161         SM_NOOP_SIGNAL(SIGALRM, oalrm);
3162         SM_NOOP_SIGNAL(SIGCHLD, ignore);
3163         SM_NOOP_SIGNAL(SIGHUP, ignore);
3164         SM_NOOP_SIGNAL(SIGINT, ignore);
3165         SM_NOOP_SIGNAL(SIGPIPE, ignore);
3166         SM_NOOP_SIGNAL(SIGTERM, ignore);
3167 #ifdef SIGUSR1
3168         SM_NOOP_SIGNAL(SIGUSR1, ousr1);
3169 #endif /* SIGUSR1 */
3170
3171         /* Turn back on signals */
3172         sm_allsignals(false);
3173
3174         (void) execve(SaveArgv[0], (ARGV_T) SaveArgv, (ARGV_T) ExternalEnviron);
3175         save_errno = errno;
3176
3177         /* block signals again and restore needed signals */
3178         sm_allsignals(true);
3179
3180         /* For finis() events */
3181         (void) sm_signal(SIGALRM, oalrm);
3182
3183 #ifdef SIGUSR1
3184         /* For debugging finis() */
3185         (void) sm_signal(SIGUSR1, ousr1);
3186 #endif /* SIGUSR1 */
3187
3188         errno = save_errno;
3189         if (LogLevel > 0)
3190                 sm_syslog(LOG_ALERT, NOQID, "could not exec %s: %s",
3191                           SaveArgv[0], sm_errstring(errno));
3192         finis(false, true, EX_OSFILE);
3193         /* NOTREACHED */
3194 }
3195 /*
3196 **  MYHOSTNAME -- return the name of this host.
3197 **
3198 **      Parameters:
3199 **              hostbuf -- a place to return the name of this host.
3200 **              size -- the size of hostbuf.
3201 **
3202 **      Returns:
3203 **              A list of aliases for this host.
3204 **
3205 **      Side Effects:
3206 **              Adds numeric codes to $=w.
3207 */
3208
3209 struct hostent *
3210 myhostname(hostbuf, size)
3211         char hostbuf[];
3212         int size;
3213 {
3214         register struct hostent *hp;
3215
3216         if (gethostname(hostbuf, size) < 0 || hostbuf[0] == '\0')
3217                 (void) sm_strlcpy(hostbuf, "localhost", size);
3218         hp = sm_gethostbyname(hostbuf, InetMode);
3219 #if NETINET && NETINET6
3220         if (hp == NULL && InetMode == AF_INET6)
3221         {
3222                 /*
3223                 **  It's possible that this IPv6 enabled machine doesn't
3224                 **  actually have any IPv6 interfaces and, therefore, no
3225                 **  IPv6 addresses.  Fall back to AF_INET.
3226                 */
3227
3228                 hp = sm_gethostbyname(hostbuf, AF_INET);
3229         }
3230 #endif /* NETINET && NETINET6 */
3231         if (hp == NULL)
3232                 return NULL;
3233         if (strchr(hp->h_name, '.') != NULL || strchr(hostbuf, '.') == NULL)
3234                 (void) cleanstrcpy(hostbuf, hp->h_name, size);
3235
3236 #if NETINFO
3237         if (strchr(hostbuf, '.') == NULL)
3238         {
3239                 char *domainname;
3240
3241                 domainname = ni_propval("/locations", NULL, "resolver",
3242                                         "domain", '\0');
3243                 if (domainname != NULL &&
3244                     strlen(domainname) + strlen(hostbuf) + 1 < size)
3245                         (void) sm_strlcat2(hostbuf, ".", domainname, size);
3246         }
3247 #endif /* NETINFO */
3248
3249         /*
3250         **  If there is still no dot in the name, try looking for a
3251         **  dotted alias.
3252         */
3253
3254         if (strchr(hostbuf, '.') == NULL)
3255         {
3256                 char **ha;
3257
3258                 for (ha = hp->h_aliases; ha != NULL && *ha != NULL; ha++)
3259                 {
3260                         if (strchr(*ha, '.') != NULL)
3261                         {
3262                                 (void) cleanstrcpy(hostbuf, *ha, size - 1);
3263                                 hostbuf[size - 1] = '\0';
3264                                 break;
3265                         }
3266                 }
3267         }
3268
3269         /*
3270         **  If _still_ no dot, wait for a while and try again -- it is
3271         **  possible that some service is starting up.  This can result
3272         **  in excessive delays if the system is badly configured, but
3273         **  there really isn't a way around that, particularly given that
3274         **  the config file hasn't been read at this point.
3275         **  All in all, a bit of a mess.
3276         */
3277
3278         if (strchr(hostbuf, '.') == NULL &&
3279             !getcanonname(hostbuf, size, true, NULL))
3280         {
3281                 sm_syslog(LocalDaemon ? LOG_WARNING : LOG_CRIT, NOQID,
3282                           "My unqualified host name (%s) unknown; sleeping for retry",
3283                           hostbuf);
3284                 message("My unqualified host name (%s) unknown; sleeping for retry",
3285                         hostbuf);
3286                 (void) sleep(60);
3287                 if (!getcanonname(hostbuf, size, true, NULL))
3288                 {
3289                         sm_syslog(LocalDaemon ? LOG_WARNING : LOG_ALERT, NOQID,
3290                                   "unable to qualify my own domain name (%s) -- using short name",
3291                                   hostbuf);
3292                         message("WARNING: unable to qualify my own domain name (%s) -- using short name",
3293                                 hostbuf);
3294                 }
3295         }
3296         return hp;
3297 }
3298 /*
3299 **  ADDRCMP -- compare two host addresses
3300 **
3301 **      Parameters:
3302 **              hp -- hostent structure for the first address
3303 **              ha -- actual first address
3304 **              sa -- second address
3305 **
3306 **      Returns:
3307 **              0 -- if ha and sa match
3308 **              else -- they don't match
3309 */
3310
3311 static int
3312 addrcmp(hp, ha, sa)
3313         struct hostent *hp;
3314         char *ha;
3315         SOCKADDR *sa;
3316 {
3317 #if NETINET6
3318         unsigned char *a;
3319 #endif /* NETINET6 */
3320
3321         switch (sa->sa.sa_family)
3322         {
3323 #if NETINET
3324           case AF_INET:
3325                 if (hp->h_addrtype == AF_INET)
3326                         return memcmp(ha, (char *) &sa->sin.sin_addr, INADDRSZ);
3327                 break;
3328 #endif /* NETINET */
3329
3330 #if NETINET6
3331           case AF_INET6:
3332                 a = (unsigned char *) &sa->sin6.sin6_addr;
3333
3334                 /* Straight binary comparison */
3335                 if (hp->h_addrtype == AF_INET6)
3336                         return memcmp(ha, a, IN6ADDRSZ);
3337
3338                 /* If IPv4-mapped IPv6 address, compare the IPv4 section */
3339                 if (hp->h_addrtype == AF_INET &&
3340                     IN6_IS_ADDR_V4MAPPED(&sa->sin6.sin6_addr))
3341                         return memcmp(a + IN6ADDRSZ - INADDRSZ, ha, INADDRSZ);
3342                 break;
3343 #endif /* NETINET6 */
3344         }
3345         return -1;
3346 }
3347 /*
3348 **  GETAUTHINFO -- get the real host name associated with a file descriptor
3349 **
3350 **      Uses RFC1413 protocol to try to get info from the other end.
3351 **
3352 **      Parameters:
3353 **              fd -- the descriptor
3354 **              may_be_forged -- an outage that is set to true if the
3355 **                      forward lookup of RealHostName does not match
3356 **                      RealHostAddr; set to false if they do match.
3357 **
3358 **      Returns:
3359 **              The user@host information associated with this descriptor.
3360 */
3361
3362 static jmp_buf  CtxAuthTimeout;
3363
3364 static void
3365 authtimeout(ignore)
3366         int ignore;
3367 {
3368         /*
3369         **  NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
3370         **      ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
3371         **      DOING.
3372         */
3373
3374         errno = ETIMEDOUT;
3375         longjmp(CtxAuthTimeout, 1);
3376 }
3377
3378 char *
3379 getauthinfo(fd, may_be_forged)
3380         int fd;
3381         bool *may_be_forged;
3382 {
3383         unsigned short SM_NONVOLATILE port = 0;
3384         SOCKADDR_LEN_T falen;
3385         register char *volatile p = NULL;
3386         SOCKADDR la;
3387         SOCKADDR_LEN_T lalen;
3388 #ifndef NO_GETSERVBYNAME
3389         register struct servent *sp;
3390 # if NETINET
3391         static unsigned short port4 = 0;
3392 # endif /* NETINET */
3393 # if NETINET6
3394         static unsigned short port6 = 0;
3395 # endif /* NETINET6 */
3396 #endif /* ! NO_GETSERVBYNAME */
3397         volatile int s;
3398         int i = 0;
3399         size_t len;
3400         SM_EVENT *ev;
3401         int nleft;
3402         struct hostent *hp;
3403         char *ostype = NULL;
3404         char **ha;
3405         char ibuf[MAXNAME + 1];
3406         static char hbuf[MAXNAME + MAXAUTHINFO + 11];
3407
3408         *may_be_forged = false;
3409         falen = sizeof(RealHostAddr);
3410         if (isatty(fd) || (i = getpeername(fd, &RealHostAddr.sa, &falen)) < 0 ||
3411             falen <= 0 || RealHostAddr.sa.sa_family == 0)
3412         {
3413                 if (i < 0)
3414                 {
3415                         /*
3416                         **  ENOTSOCK is OK: bail on anything else, but reset
3417                         **  errno in this case, so a mis-report doesn't
3418                         **  happen later.
3419                         */
3420
3421                         if (errno != ENOTSOCK)
3422                                 return NULL;
3423                         errno = 0;
3424                 }
3425                 (void) sm_strlcpyn(hbuf, sizeof(hbuf), 2, RealUserName,
3426                                    "@localhost");
3427                 if (tTd(9, 1))
3428                         sm_dprintf("getauthinfo: %s\n", hbuf);
3429                 return hbuf;
3430         }
3431
3432         if (RealHostName == NULL)
3433         {
3434                 /* translate that to a host name */
3435                 RealHostName = newstr(hostnamebyanyaddr(&RealHostAddr));
3436                 if (strlen(RealHostName) > MAXNAME)
3437                         RealHostName[MAXNAME] = '\0'; /* XXX - 1 ? */
3438         }
3439
3440         /* cross check RealHostName with forward DNS lookup */
3441         if (anynet_ntoa(&RealHostAddr)[0] != '[' &&
3442             RealHostName[0] != '[')
3443         {
3444                 int family;
3445
3446                 family = RealHostAddr.sa.sa_family;
3447 #if NETINET6 && NEEDSGETIPNODE
3448                 /*
3449                 **  If RealHostAddr is an IPv6 connection with an
3450                 **  IPv4-mapped address, we need RealHostName's IPv4
3451                 **  address(es) for addrcmp() to compare against
3452                 **  RealHostAddr.
3453                 **
3454                 **  Actually, we only need to do this for systems
3455                 **  which NEEDSGETIPNODE since the real getipnodebyname()
3456                 **  already does V4MAPPED address via the AI_V4MAPPEDCFG
3457                 **  flag.  A better fix to this problem is to add this
3458                 **  functionality to our stub getipnodebyname().
3459                 */
3460
3461                 if (family == AF_INET6 &&
3462                     IN6_IS_ADDR_V4MAPPED(&RealHostAddr.sin6.sin6_addr))
3463                         family = AF_INET;
3464 #endif /* NETINET6 && NEEDSGETIPNODE */
3465
3466                 /* try to match the reverse against the forward lookup */
3467                 hp = sm_gethostbyname(RealHostName, family);
3468                 if (hp == NULL)
3469                 {
3470                         /* XXX: Could be a temporary error on forward lookup */
3471                         *may_be_forged = true;
3472                 }
3473                 else
3474                 {
3475                         for (ha = hp->h_addr_list; *ha != NULL; ha++)
3476                         {
3477                                 if (addrcmp(hp, *ha, &RealHostAddr) == 0)
3478                                         break;
3479                         }
3480                         *may_be_forged = *ha == NULL;
3481 #if NETINET6
3482                         freehostent(hp);
3483                         hp = NULL;
3484 #endif /* NETINET6 */
3485                 }
3486         }
3487
3488         if (TimeOuts.to_ident == 0)
3489                 goto noident;
3490
3491         lalen = sizeof(la);
3492         switch (RealHostAddr.sa.sa_family)
3493         {
3494 #if NETINET
3495           case AF_INET:
3496                 if (getsockname(fd, &la.sa, &lalen) < 0 ||
3497                     lalen <= 0 ||
3498                     la.sa.sa_family != AF_INET)
3499                 {
3500                         /* no ident info */
3501                         goto noident;
3502                 }
3503                 port = RealHostAddr.sin.sin_port;
3504
3505                 /* create ident query */
3506                 (void) sm_snprintf(ibuf, sizeof(ibuf), "%d,%d\r\n",
3507                                 ntohs(RealHostAddr.sin.sin_port),
3508                                 ntohs(la.sin.sin_port));
3509
3510                 /* create local address */
3511                 la.sin.sin_port = 0;
3512
3513                 /* create foreign address */
3514 # ifdef NO_GETSERVBYNAME
3515                 RealHostAddr.sin.sin_port = htons(113);
3516 # else /* NO_GETSERVBYNAME */
3517
3518                 /*
3519                 **  getservbyname() consumes about 5% of the time
3520                 **  when receiving a small message (almost all of the time
3521                 **  spent in this routine).
3522                 **  Hence we store the port in a static variable
3523                 **  to save this time.
3524                 **  The portnumber shouldn't change very often...
3525                 **  This code makes the assumption that the port number
3526                 **  is not 0.
3527                 */
3528
3529                 if (port4 == 0)
3530                 {
3531                         sp = getservbyname("auth", "tcp");
3532                         if (sp != NULL)
3533                                 port4 = sp->s_port;
3534                         else
3535                                 port4 = htons(113);
3536                 }
3537                 RealHostAddr.sin.sin_port = port4;
3538                 break;
3539 # endif /* NO_GETSERVBYNAME */
3540 #endif /* NETINET */
3541
3542 #if NETINET6
3543           case AF_INET6:
3544                 if (getsockname(fd, &la.sa, &lalen) < 0 ||
3545                     lalen <= 0 ||
3546                     la.sa.sa_family != AF_INET6)
3547                 {
3548                         /* no ident info */
3549                         goto noident;
3550                 }
3551                 port = RealHostAddr.sin6.sin6_port;
3552
3553                 /* create ident query */
3554                 (void) sm_snprintf(ibuf, sizeof(ibuf), "%d,%d\r\n",
3555                                 ntohs(RealHostAddr.sin6.sin6_port),
3556                                 ntohs(la.sin6.sin6_port));
3557
3558                 /* create local address */
3559                 la.sin6.sin6_port = 0;
3560
3561                 /* create foreign address */
3562 # ifdef NO_GETSERVBYNAME
3563                 RealHostAddr.sin6.sin6_port = htons(113);
3564 # else /* NO_GETSERVBYNAME */
3565                 if (port6 == 0)
3566                 {
3567                         sp = getservbyname("auth", "tcp");
3568                         if (sp != NULL)
3569                                 port6 = sp->s_port;
3570                         else
3571                                 port6 = htons(113);
3572                 }
3573                 RealHostAddr.sin6.sin6_port = port6;
3574                 break;
3575 # endif /* NO_GETSERVBYNAME */
3576 #endif /* NETINET6 */
3577           default:
3578                 /* no ident info */
3579                 goto noident;
3580         }
3581
3582         s = -1;
3583         if (setjmp(CtxAuthTimeout) != 0)
3584         {
3585                 if (s >= 0)
3586                         (void) close(s);
3587                 goto noident;
3588         }
3589
3590         /* put a timeout around the whole thing */
3591         ev = sm_setevent(TimeOuts.to_ident, authtimeout, 0);
3592
3593         /* connect to foreign IDENT server using same address as SMTP socket */
3594         s = socket(la.sa.sa_family, SOCK_STREAM, 0);
3595         if (s < 0)
3596         {
3597                 sm_clrevent(ev);
3598                 goto noident;
3599         }
3600         if (bind(s, &la.sa, lalen) < 0 ||
3601             connect(s, &RealHostAddr.sa, lalen) < 0)
3602                 goto closeident;
3603
3604         if (tTd(9, 10))
3605                 sm_dprintf("getauthinfo: sent %s", ibuf);
3606
3607         /* send query */
3608         if (write(s, ibuf, strlen(ibuf)) < 0)
3609                 goto closeident;
3610
3611         /* get result */
3612         p = &ibuf[0];
3613         nleft = sizeof(ibuf) - 1;
3614         while ((i = read(s, p, nleft)) > 0)
3615         {
3616                 char *s;
3617
3618                 p += i;
3619                 nleft -= i;
3620                 *p = '\0';
3621                 if ((s = strchr(ibuf, '\n')) != NULL)
3622                 {
3623                         if (p > s + 1)
3624                         {
3625                                 p = s + 1;
3626                                 *p = '\0';
3627                         }
3628                         break;
3629                 }
3630                 if (nleft <= 0)
3631                         break;
3632         }
3633         (void) close(s);
3634         sm_clrevent(ev);
3635         if (i < 0 || p == &ibuf[0])
3636                 goto noident;
3637
3638         if (p >= &ibuf[2] && *--p == '\n' && *--p == '\r')
3639                 p--;
3640         *++p = '\0';
3641
3642         if (tTd(9, 3))
3643                 sm_dprintf("getauthinfo:  got %s\n", ibuf);
3644
3645         /* parse result */
3646         p = strchr(ibuf, ':');
3647         if (p == NULL)
3648         {
3649                 /* malformed response */
3650                 goto noident;
3651         }
3652         while (isascii(*++p) && isspace(*p))
3653                 continue;
3654         if (sm_strncasecmp(p, "userid", 6) != 0)
3655         {
3656                 /* presumably an error string */
3657                 goto noident;
3658         }
3659         p += 6;
3660         while (isascii(*p) && isspace(*p))
3661                 p++;
3662         if (*p++ != ':')
3663         {
3664                 /* either useridxx or malformed response */
3665                 goto noident;
3666         }
3667
3668         /* p now points to the OSTYPE field */
3669         while (isascii(*p) && isspace(*p))
3670                 p++;
3671         ostype = p;
3672         p = strchr(p, ':');
3673         if (p == NULL)
3674         {
3675                 /* malformed response */
3676                 goto noident;
3677         }
3678         else
3679         {
3680                 char *charset;
3681
3682                 *p = '\0';
3683                 charset = strchr(ostype, ',');
3684                 if (charset != NULL)
3685                         *charset = '\0';
3686         }
3687
3688         /* 1413 says don't do this -- but it's broken otherwise */
3689         while (isascii(*++p) && isspace(*p))
3690                 continue;
3691
3692         /* p now points to the authenticated name -- copy carefully */
3693         if (sm_strncasecmp(ostype, "other", 5) == 0 &&
3694             (ostype[5] == ' ' || ostype[5] == '\0'))
3695         {
3696                 (void) sm_strlcpy(hbuf, "IDENT:", sizeof(hbuf));
3697                 cleanstrcpy(&hbuf[6], p, MAXAUTHINFO);
3698         }
3699         else
3700                 cleanstrcpy(hbuf, p, MAXAUTHINFO);
3701         len = strlen(hbuf);
3702         (void) sm_strlcpyn(&hbuf[len], sizeof(hbuf) - len, 2, "@",
3703                            RealHostName == NULL ? "localhost" : RealHostName);
3704         goto postident;
3705
3706 closeident:
3707         (void) close(s);
3708         sm_clrevent(ev);
3709
3710 noident:
3711         /* put back the original incoming port */
3712         switch (RealHostAddr.sa.sa_family)
3713         {
3714 #if NETINET
3715           case AF_INET:
3716                 if (port > 0)
3717                         RealHostAddr.sin.sin_port = port;
3718                 break;
3719 #endif /* NETINET */
3720
3721 #if NETINET6
3722           case AF_INET6:
3723                 if (port > 0)
3724                         RealHostAddr.sin6.sin6_port = port;
3725                 break;
3726 #endif /* NETINET6 */
3727         }
3728
3729         if (RealHostName == NULL)
3730         {
3731                 if (tTd(9, 1))
3732                         sm_dprintf("getauthinfo: NULL\n");
3733                 return NULL;
3734         }
3735         (void) sm_strlcpy(hbuf, RealHostName, sizeof(hbuf));
3736
3737 postident:
3738 #if IP_SRCROUTE
3739 # ifndef GET_IPOPT_DST
3740 #  define GET_IPOPT_DST(dst)    (dst)
3741 # endif /* ! GET_IPOPT_DST */
3742         /*
3743         **  Extract IP source routing information.
3744         **
3745         **      Format of output for a connection from site a through b
3746         **      through c to d:
3747         **              loose:      @site-c@site-b:site-a
3748         **              strict:    !@site-c@site-b:site-a
3749         **
3750         **      o - pointer within ipopt_list structure.
3751         **      q - pointer within ls/ss rr route data
3752         **      p - pointer to hbuf
3753         */
3754
3755         if (RealHostAddr.sa.sa_family == AF_INET)
3756         {
3757                 SOCKOPT_LEN_T ipoptlen;
3758                 int j;
3759                 unsigned char *q;
3760                 unsigned char *o;
3761                 int l;
3762                 struct IPOPTION ipopt;
3763
3764                 ipoptlen = sizeof(ipopt);
3765                 if (getsockopt(fd, IPPROTO_IP, IP_OPTIONS,
3766                                (char *) &ipopt, &ipoptlen) < 0)
3767                         goto noipsr;
3768                 if (ipoptlen == 0)
3769                         goto noipsr;
3770                 o = (unsigned char *) ipopt.IP_LIST;
3771                 while (o != NULL && o < (unsigned char *) &ipopt + ipoptlen)
3772                 {
3773                         switch (*o)
3774                         {
3775                           case IPOPT_EOL:
3776                                 o = NULL;
3777                                 break;
3778
3779                           case IPOPT_NOP:
3780                                 o++;
3781                                 break;
3782
3783                           case IPOPT_SSRR:
3784                           case IPOPT_LSRR:
3785                                 /*
3786                                 **  Source routing.
3787                                 **      o[0] is the option type (loose/strict).
3788                                 **      o[1] is the length of this option,
3789                                 **              including option type and
3790                                 **              length.
3791                                 **      o[2] is the pointer into the route
3792                                 **              data.
3793                                 **      o[3] begins the route data.
3794                                 */
3795
3796                                 p = &hbuf[strlen(hbuf)];
3797                                 l = sizeof(hbuf) - (hbuf - p) - 6;
3798                                 (void) sm_snprintf(p, SPACELEFT(hbuf, p),
3799                                         " [%s@%.*s",
3800                                         *o == IPOPT_SSRR ? "!" : "",
3801                                         l > 240 ? 120 : l / 2,
3802                                         inet_ntoa(GET_IPOPT_DST(ipopt.IP_DST)));
3803                                 i = strlen(p);
3804                                 p += i;
3805                                 l -= strlen(p);
3806
3807                                 j = o[1] / sizeof(struct in_addr) - 1;
3808
3809                                 /* q skips length and router pointer to data */
3810                                 q = &o[3];
3811                                 for ( ; j >= 0; j--)
3812                                 {
3813                                         struct in_addr addr;
3814
3815                                         memcpy(&addr, q, sizeof(addr));
3816                                         (void) sm_snprintf(p,
3817                                                 SPACELEFT(hbuf, p),
3818                                                 "%c%.*s",
3819                                                 j != 0 ? '@' : ':',
3820                                                 l > 240 ? 120 :
3821                                                         j == 0 ? l : l / 2,
3822                                                 inet_ntoa(addr));
3823                                         i = strlen(p);
3824                                         p += i;
3825                                         l -= i + 1;
3826                                         q += sizeof(struct in_addr);
3827                                 }
3828                                 o += o[1];
3829                                 break;
3830
3831                           default:
3832                                 /* Skip over option */
3833                                 o += o[1];
3834                                 break;
3835                         }
3836                 }
3837                 (void) sm_snprintf(p, SPACELEFT(hbuf, p), "]");
3838                 goto postipsr;
3839         }
3840
3841 noipsr:
3842 #endif /* IP_SRCROUTE */
3843         if (RealHostName != NULL && RealHostName[0] != '[')
3844         {
3845                 p = &hbuf[strlen(hbuf)];
3846                 (void) sm_snprintf(p, SPACELEFT(hbuf, p), " [%.100s]",
3847                                    anynet_ntoa(&RealHostAddr));
3848         }
3849         if (*may_be_forged)
3850         {
3851                 p = &hbuf[strlen(hbuf)];
3852                 (void) sm_strlcpy(p, " (may be forged)", SPACELEFT(hbuf, p));
3853                 macdefine(&BlankEnvelope.e_macro, A_PERM,
3854                           macid("{client_resolve}"), "FORGED");
3855         }
3856
3857 #if IP_SRCROUTE
3858 postipsr:
3859 #endif /* IP_SRCROUTE */
3860
3861         /* put back the original incoming port */
3862         switch (RealHostAddr.sa.sa_family)
3863         {
3864 #if NETINET
3865           case AF_INET:
3866                 if (port > 0)
3867                         RealHostAddr.sin.sin_port = port;
3868                 break;
3869 #endif /* NETINET */
3870
3871 #if NETINET6
3872           case AF_INET6:
3873                 if (port > 0)
3874                         RealHostAddr.sin6.sin6_port = port;
3875                 break;
3876 #endif /* NETINET6 */
3877         }
3878
3879         if (tTd(9, 1))
3880                 sm_dprintf("getauthinfo: %s\n", hbuf);
3881         return hbuf;
3882 }
3883 /*
3884 **  HOST_MAP_LOOKUP -- turn a hostname into canonical form
3885 **
3886 **      Parameters:
3887 **              map -- a pointer to this map.
3888 **              name -- the (presumably unqualified) hostname.
3889 **              av -- unused -- for compatibility with other mapping
3890 **                      functions.
3891 **              statp -- an exit status (out parameter) -- set to
3892 **                      EX_TEMPFAIL if the name server is unavailable.
3893 **
3894 **      Returns:
3895 **              The mapping, if found.
3896 **              NULL if no mapping found.
3897 **
3898 **      Side Effects:
3899 **              Looks up the host specified in hbuf.  If it is not
3900 **              the canonical name for that host, return the canonical
3901 **              name (unless MF_MATCHONLY is set, which will cause the
3902 **              status only to be returned).
3903 */
3904
3905 char *
3906 host_map_lookup(map, name, av, statp)
3907         MAP *map;
3908         char *name;
3909         char **av;
3910         int *statp;
3911 {
3912         register struct hostent *hp;
3913 #if NETINET
3914         struct in_addr in_addr;
3915 #endif /* NETINET */
3916 #if NETINET6
3917         struct in6_addr in6_addr;
3918 #endif /* NETINET6 */
3919         char *cp, *ans = NULL;
3920         register STAB *s;
3921         time_t now;
3922 #if NAMED_BIND
3923         time_t SM_NONVOLATILE retrans = 0;
3924         int SM_NONVOLATILE retry = 0;
3925 #endif /* NAMED_BIND */
3926         char hbuf[MAXNAME + 1];
3927
3928         /*
3929         **  See if we have already looked up this name.  If so, just
3930         **  return it (unless expired).
3931         */
3932
3933         now = curtime();
3934         s = stab(name, ST_NAMECANON, ST_ENTER);
3935         if (bitset(NCF_VALID, s->s_namecanon.nc_flags) &&
3936             s->s_namecanon.nc_exp >= now)
3937         {
3938                 if (tTd(9, 1))
3939                         sm_dprintf("host_map_lookup(%s) => CACHE %s\n",
3940                                     name,
3941                                     s->s_namecanon.nc_cname == NULL
3942                                         ? "NULL"
3943                                         : s->s_namecanon.nc_cname);
3944                 errno = s->s_namecanon.nc_errno;
3945                 SM_SET_H_ERRNO(s->s_namecanon.nc_herrno);
3946                 *statp = s->s_namecanon.nc_stat;
3947                 if (*statp == EX_TEMPFAIL)
3948                 {
3949                         CurEnv->e_status = "4.4.3";
3950                         message("851 %s: Name server timeout",
3951                                 shortenstring(name, 33));
3952                 }
3953                 if (*statp != EX_OK)
3954                         return NULL;
3955                 if (s->s_namecanon.nc_cname == NULL)
3956                 {
3957                         syserr("host_map_lookup(%s): bogus NULL cache entry, errno=%d, h_errno=%d",
3958                                name,
3959                                s->s_namecanon.nc_errno,
3960                                s->s_namecanon.nc_herrno);
3961                         return NULL;
3962                 }
3963                 if (bitset(MF_MATCHONLY, map->map_mflags))
3964                         cp = map_rewrite(map, name, strlen(name), NULL);
3965                 else
3966                         cp = map_rewrite(map,
3967                                          s->s_namecanon.nc_cname,
3968                                          strlen(s->s_namecanon.nc_cname),
3969                                          av);
3970                 return cp;
3971         }
3972
3973         /*
3974         **  If we are running without a regular network connection (usually
3975         **  dial-on-demand) and we are just queueing, we want to avoid DNS
3976         **  lookups because those could try to connect to a server.
3977         */
3978
3979         if (CurEnv->e_sendmode == SM_DEFER &&
3980             bitset(MF_DEFER, map->map_mflags))
3981         {
3982                 if (tTd(9, 1))
3983                         sm_dprintf("host_map_lookup(%s) => DEFERRED\n", name);
3984                 *statp = EX_TEMPFAIL;
3985                 return NULL;
3986         }
3987
3988         /*
3989         **  If first character is a bracket, then it is an address
3990         **  lookup.  Address is copied into a temporary buffer to
3991         **  strip the brackets and to preserve name if address is
3992         **  unknown.
3993         */
3994
3995         if (tTd(9, 1))
3996                 sm_dprintf("host_map_lookup(%s) => ", name);
3997 #if NAMED_BIND
3998         if (map->map_timeout > 0)
3999         {
4000                 retrans = _res.retrans;
4001                 _res.retrans = map->map_timeout;
4002         }
4003         if (map->map_retry > 0)
4004         {
4005                 retry = _res.retry;
4006                 _res.retry = map->map_retry;
4007         }
4008 #endif /* NAMED_BIND */
4009
4010         /* set default TTL */
4011         s->s_namecanon.nc_exp = now + SM_DEFAULT_TTL;
4012         if (*name != '[')
4013         {
4014                 int ttl;
4015
4016                 (void) sm_strlcpy(hbuf, name, sizeof(hbuf));
4017                 if (getcanonname(hbuf, sizeof(hbuf) - 1, !HasWildcardMX, &ttl))
4018                 {
4019                         ans = hbuf;
4020                         if (ttl > 0)
4021                                 s->s_namecanon.nc_exp = now + SM_MIN(ttl,
4022                                                                 SM_DEFAULT_TTL);
4023                 }
4024         }
4025         else
4026         {
4027                 if ((cp = strchr(name, ']')) == NULL)
4028                 {
4029                         if (tTd(9, 1))
4030                                 sm_dprintf("FAILED\n");
4031                         return NULL;
4032                 }
4033                 *cp = '\0';
4034
4035                 hp = NULL;
4036 #if NETINET
4037                 if ((in_addr.s_addr = inet_addr(&name[1])) != INADDR_NONE)
4038                         hp = sm_gethostbyaddr((char *)&in_addr,
4039                                               INADDRSZ, AF_INET);
4040 #endif /* NETINET */
4041 #if NETINET6
4042                 if (hp == NULL &&
4043                     anynet_pton(AF_INET6, &name[1], &in6_addr) == 1)
4044                         hp = sm_gethostbyaddr((char *)&in6_addr,
4045                                               IN6ADDRSZ, AF_INET6);
4046 #endif /* NETINET6 */
4047                 *cp = ']';
4048
4049                 if (hp != NULL)
4050                 {
4051                         /* found a match -- copy out */
4052                         ans = denlstring((char *) hp->h_name, true, true);
4053 #if NETINET6
4054                         if (ans == hp->h_name)
4055                         {
4056                                 static char n[MAXNAME + 1];
4057
4058                                 /* hp->h_name is about to disappear */
4059                                 (void) sm_strlcpy(n, ans, sizeof(n));
4060                                 ans = n;
4061                         }
4062                         freehostent(hp);
4063                         hp = NULL;
4064 #endif /* NETINET6 */
4065                 }
4066         }
4067 #if NAMED_BIND
4068         if (map->map_timeout > 0)
4069                 _res.retrans = retrans;
4070         if (map->map_retry > 0)
4071                 _res.retry = retry;
4072 #endif /* NAMED_BIND */
4073
4074         s->s_namecanon.nc_flags |= NCF_VALID;   /* will be soon */
4075
4076         /* Found an answer */
4077         if (ans != NULL)
4078         {
4079                 s->s_namecanon.nc_stat = *statp = EX_OK;
4080                 if (s->s_namecanon.nc_cname != NULL)
4081                         sm_free(s->s_namecanon.nc_cname);
4082                 s->s_namecanon.nc_cname = sm_strdup_x(ans);
4083                 if (bitset(MF_MATCHONLY, map->map_mflags))
4084                         cp = map_rewrite(map, name, strlen(name), NULL);
4085                 else
4086                         cp = map_rewrite(map, ans, strlen(ans), av);
4087                 if (tTd(9, 1))
4088                         sm_dprintf("FOUND %s\n", ans);
4089                 return cp;
4090         }
4091
4092
4093         /* No match found */
4094         s->s_namecanon.nc_errno = errno;
4095 #if NAMED_BIND
4096         s->s_namecanon.nc_herrno = h_errno;
4097         if (tTd(9, 1))
4098                 sm_dprintf("FAIL (%d)\n", h_errno);
4099         switch (h_errno)
4100         {
4101           case TRY_AGAIN:
4102                 if (UseNameServer)
4103                 {
4104                         CurEnv->e_status = "4.4.3";
4105                         message("851 %s: Name server timeout",
4106                                 shortenstring(name, 33));
4107                 }
4108                 *statp = EX_TEMPFAIL;
4109                 break;
4110
4111           case HOST_NOT_FOUND:
4112           case NO_DATA:
4113                 *statp = EX_NOHOST;
4114                 break;
4115
4116           case NO_RECOVERY:
4117                 *statp = EX_SOFTWARE;
4118                 break;
4119
4120           default:
4121                 *statp = EX_UNAVAILABLE;
4122                 break;
4123         }
4124 #else /* NAMED_BIND */
4125         if (tTd(9, 1))
4126                 sm_dprintf("FAIL\n");
4127         *statp = EX_NOHOST;
4128 #endif /* NAMED_BIND */
4129         s->s_namecanon.nc_stat = *statp;
4130         return NULL;
4131 }
4132 /*
4133 **  HOST_MAP_INIT -- initialize host class structures
4134 **
4135 **      Parameters:
4136 **              map -- a pointer to this map.
4137 **              args -- argument string.
4138 **
4139 **      Returns:
4140 **              true.
4141 */
4142
4143 bool
4144 host_map_init(map, args)
4145         MAP *map;
4146         char *args;
4147 {
4148         register char *p = args;
4149
4150         for (;;)
4151         {
4152                 while (isascii(*p) && isspace(*p))
4153                         p++;
4154                 if (*p != '-')
4155                         break;
4156                 switch (*++p)
4157                 {
4158                   case 'a':
4159                         map->map_app = ++p;
4160                         break;
4161
4162                   case 'T':
4163                         map->map_tapp = ++p;
4164                         break;
4165
4166                   case 'm':
4167                         map->map_mflags |= MF_MATCHONLY;
4168                         break;
4169
4170                   case 't':
4171                         map->map_mflags |= MF_NODEFER;
4172                         break;
4173
4174                   case 'S':     /* only for consistency */
4175                         map->map_spacesub = *++p;
4176                         break;
4177
4178                   case 'D':
4179                         map->map_mflags |= MF_DEFER;
4180                         break;
4181
4182                   case 'd':
4183                         {
4184                                 char *h;
4185
4186                                 while (isascii(*++p) && isspace(*p))
4187                                         continue;
4188                                 h = strchr(p, ' ');
4189                                 if (h != NULL)
4190                                         *h = '\0';
4191                                 map->map_timeout = convtime(p, 's');
4192                                 if (h != NULL)
4193                                         *h = ' ';
4194                         }
4195                         break;
4196
4197                   case 'r':
4198                         while (isascii(*++p) && isspace(*p))
4199                                 continue;
4200                         map->map_retry = atoi(p);
4201                         break;
4202                 }
4203                 while (*p != '\0' && !(isascii(*p) && isspace(*p)))
4204                         p++;
4205                 if (*p != '\0')
4206                         *p++ = '\0';
4207         }
4208         if (map->map_app != NULL)
4209                 map->map_app = newstr(map->map_app);
4210         if (map->map_tapp != NULL)
4211                 map->map_tapp = newstr(map->map_tapp);
4212         return true;
4213 }
4214
4215 #if NETINET6
4216 /*
4217 **  ANYNET_NTOP -- convert an IPv6 network address to printable form.
4218 **
4219 **      Parameters:
4220 **              s6a -- a pointer to an in6_addr structure.
4221 **              dst -- buffer to store result in
4222 **              dst_len -- size of dst buffer
4223 **
4224 **      Returns:
4225 **              A printable version of that structure.
4226 */
4227
4228 char *
4229 anynet_ntop(s6a, dst, dst_len)
4230         struct in6_addr *s6a;
4231         char *dst;
4232         size_t dst_len;
4233 {
4234         register char *ap;
4235
4236         if (IN6_IS_ADDR_V4MAPPED(s6a))
4237                 ap = (char *) inet_ntop(AF_INET,
4238                                         &s6a->s6_addr[IN6ADDRSZ - INADDRSZ],
4239                                         dst, dst_len);
4240         else
4241         {
4242                 char *d;
4243                 size_t sz;
4244
4245                 /* Save pointer to beginning of string */
4246                 d = dst;
4247
4248                 /* Add IPv6: protocol tag */
4249                 sz = sm_strlcpy(dst, "IPv6:", dst_len);
4250                 if (sz >= dst_len)
4251                         return NULL;
4252                 dst += sz;
4253                 dst_len -= sz;
4254                 ap = (char *) inet_ntop(AF_INET6, s6a, dst, dst_len);
4255
4256                 /* Restore pointer to beginning of string */
4257                 if (ap != NULL)
4258                         ap = d;
4259         }
4260         return ap;
4261 }
4262
4263 /*
4264 **  ANYNET_PTON -- convert printed form to network address.
4265 **
4266 **      Wrapper for inet_pton() which handles IPv6: labels.
4267 **
4268 **      Parameters:
4269 **              family -- address family
4270 **              src -- string
4271 **              dst -- destination address structure
4272 **
4273 **      Returns:
4274 **              1 if the address was valid
4275 **              0 if the address wasn't parseable
4276 **              -1 if error
4277 */
4278
4279 int
4280 anynet_pton(family, src, dst)
4281         int family;
4282         const char *src;
4283         void *dst;
4284 {
4285         if (family == AF_INET6 && sm_strncasecmp(src, "IPv6:", 5) == 0)
4286                 src += 5;
4287         return inet_pton(family, src, dst);
4288 }
4289 #endif /* NETINET6 */
4290 /*
4291 **  ANYNET_NTOA -- convert a network address to printable form.
4292 **
4293 **      Parameters:
4294 **              sap -- a pointer to a sockaddr structure.
4295 **
4296 **      Returns:
4297 **              A printable version of that sockaddr.
4298 */
4299
4300 #ifdef USE_SOCK_STREAM
4301
4302 # if NETLINK
4303 #  include <net/if_dl.h>
4304 # endif /* NETLINK */
4305
4306 char *
4307 anynet_ntoa(sap)
4308         register SOCKADDR *sap;
4309 {
4310         register char *bp;
4311         register char *ap;
4312         int l;
4313         static char buf[100];
4314
4315         /* check for null/zero family */
4316         if (sap == NULL)
4317                 return "NULLADDR";
4318         if (sap->sa.sa_family == 0)
4319                 return "0";
4320
4321         switch (sap->sa.sa_family)
4322         {
4323 # if NETUNIX
4324           case AF_UNIX:
4325                 if (sap->sunix.sun_path[0] != '\0')
4326                         (void) sm_snprintf(buf, sizeof(buf), "[UNIX: %.64s]",
4327                                            sap->sunix.sun_path);
4328                 else
4329                         (void) sm_strlcpy(buf, "[UNIX: localhost]", sizeof(buf));
4330                 return buf;
4331 # endif /* NETUNIX */
4332
4333 # if NETINET
4334           case AF_INET:
4335                 return (char *) inet_ntoa(sap->sin.sin_addr);
4336 # endif /* NETINET */
4337
4338 # if NETINET6
4339           case AF_INET6:
4340                 ap = anynet_ntop(&sap->sin6.sin6_addr, buf, sizeof(buf));
4341                 if (ap != NULL)
4342                         return ap;
4343                 break;
4344 # endif /* NETINET6 */
4345
4346 # if NETLINK
4347           case AF_LINK:
4348                 (void) sm_snprintf(buf, sizeof(buf), "[LINK: %s]",
4349                                    link_ntoa((struct sockaddr_dl *) &sap->sa));
4350                 return buf;
4351 # endif /* NETLINK */
4352           default:
4353                 /* this case is needed when nothing is #defined */
4354                 /* in order to keep the switch syntactically correct */
4355                 break;
4356         }
4357
4358         /* unknown family -- just dump bytes */
4359         (void) sm_snprintf(buf, sizeof(buf), "Family %d: ", sap->sa.sa_family);
4360         bp = &buf[strlen(buf)];
4361         ap = sap->sa.sa_data;
4362         for (l = sizeof(sap->sa.sa_data); --l >= 0; )
4363         {
4364                 (void) sm_snprintf(bp, SPACELEFT(buf, bp), "%02x:",
4365                                    *ap++ & 0377);
4366                 bp += 3;
4367         }
4368         *--bp = '\0';
4369         return buf;
4370 }
4371 /*
4372 **  HOSTNAMEBYANYADDR -- return name of host based on address
4373 **
4374 **      Parameters:
4375 **              sap -- SOCKADDR pointer
4376 **
4377 **      Returns:
4378 **              text representation of host name.
4379 **
4380 **      Side Effects:
4381 **              none.
4382 */
4383
4384 char *
4385 hostnamebyanyaddr(sap)
4386         register SOCKADDR *sap;
4387 {
4388         register struct hostent *hp;
4389 # if NAMED_BIND
4390         int saveretry;
4391 # endif /* NAMED_BIND */
4392 # if NETINET6
4393         struct in6_addr in6_addr;
4394 # endif /* NETINET6 */
4395
4396 # if NAMED_BIND
4397         /* shorten name server timeout to avoid higher level timeouts */
4398         saveretry = _res.retry;
4399         if (_res.retry * _res.retrans > 20)
4400                 _res.retry = 20 / _res.retrans;
4401 # endif /* NAMED_BIND */
4402
4403         switch (sap->sa.sa_family)
4404         {
4405 # if NETINET
4406           case AF_INET:
4407                 hp = sm_gethostbyaddr((char *) &sap->sin.sin_addr,
4408                                       INADDRSZ, AF_INET);
4409                 break;
4410 # endif /* NETINET */
4411
4412 # if NETINET6
4413           case AF_INET6:
4414                 hp = sm_gethostbyaddr((char *) &sap->sin6.sin6_addr,
4415                                       IN6ADDRSZ, AF_INET6);
4416                 break;
4417 # endif /* NETINET6 */
4418
4419 # if NETISO
4420           case AF_ISO:
4421                 hp = sm_gethostbyaddr((char *) &sap->siso.siso_addr,
4422                                       sizeof(sap->siso.siso_addr), AF_ISO);
4423                 break;
4424 # endif /* NETISO */
4425
4426 # if NETUNIX
4427           case AF_UNIX:
4428                 hp = NULL;
4429                 break;
4430 # endif /* NETUNIX */
4431
4432           default:
4433                 hp = sm_gethostbyaddr(sap->sa.sa_data, sizeof(sap->sa.sa_data),
4434                                       sap->sa.sa_family);
4435                 break;
4436         }
4437
4438 # if NAMED_BIND
4439         _res.retry = saveretry;
4440 # endif /* NAMED_BIND */
4441
4442 # if NETINET || NETINET6
4443         if (hp != NULL && hp->h_name[0] != '['
4444 #  if NETINET6
4445             && inet_pton(AF_INET6, hp->h_name, &in6_addr) != 1
4446 #  endif /* NETINET6 */
4447 #  if NETINET
4448             && inet_addr(hp->h_name) == INADDR_NONE
4449 #  endif /* NETINET */
4450             )
4451         {
4452                 char *name;
4453
4454                 name = denlstring((char *) hp->h_name, true, true);
4455 #  if NETINET6
4456                 if (name == hp->h_name)
4457                 {
4458                         static char n[MAXNAME + 1];
4459
4460                         /* Copy the string, hp->h_name is about to disappear */
4461                         (void) sm_strlcpy(n, name, sizeof(n));
4462                         name = n;
4463                 }
4464                 freehostent(hp);
4465 #  endif /* NETINET6 */
4466                 return name;
4467         }
4468 # endif /* NETINET || NETINET6 */
4469
4470 # if NETINET6
4471         if (hp != NULL)
4472         {
4473                 freehostent(hp);
4474                 hp = NULL;
4475         }
4476 # endif /* NETINET6 */
4477
4478 # if NETUNIX
4479         if (sap->sa.sa_family == AF_UNIX && sap->sunix.sun_path[0] == '\0')
4480                 return "localhost";
4481 # endif /* NETUNIX */
4482         {
4483                 static char buf[203];
4484
4485                 (void) sm_snprintf(buf, sizeof(buf), "[%.200s]",
4486                                    anynet_ntoa(sap));
4487                 return buf;
4488         }
4489 }
4490 #endif /* USE_SOCK_STREAM */