contrib/sendmail-8.14/sendmail/savemail.c

   1 /*
   2  * Copyright (c) 1998-2003, 2006 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
  16 SM_RCSID("@(#)$Id: savemail.c,v 8.314 2009/12/18 17:08:01 ca Exp $")
  17
  18 static bool     errbody __P((MCI *, ENVELOPE *, char *));
  19 static bool     pruneroute __P((char *));
  20
  21 /*
  22 **  SAVEMAIL -- Save mail on error
  23 **
  24 **      If mailing back errors, mail it back to the originator
  25 **      together with an error message; otherwise, just put it in
  26 **      dead.letter in the user's home directory (if he exists on
  27 **      this machine).
  28 **
  29 **      Parameters:
  30 **              e -- the envelope containing the message in error.
  31 **              sendbody -- if true, also send back the body of the
  32 **                      message; otherwise just send the header.
  33 **
  34 **      Returns:
  35 **              true if savemail panic'ed, (i.e., the data file should
  36 **              be preserved by dropenvelope())
  37 **
  38 **      Side Effects:
  39 **              Saves the letter, by writing or mailing it back to the
  40 **              sender, or by putting it in dead.letter in her home
  41 **              directory.
  42 */
  43
  44 /* defines for state machine */
  45 #define ESM_REPORT              0       /* report to sender's terminal */
  46 #define ESM_MAIL                1       /* mail back to sender */
  47 #define ESM_QUIET               2       /* mail has already been returned */
  48 #define ESM_DEADLETTER          3       /* save in ~/dead.letter */
  49 #define ESM_POSTMASTER          4       /* return to postmaster */
  50 #define ESM_DEADLETTERDROP      5       /* save in DeadLetterDrop */
  51 #define ESM_PANIC               6       /* call loseqfile() */
  52 #define ESM_DONE                7       /* message is successfully delivered */
  53
  54 bool
  55 savemail(e, sendbody)
  56         register ENVELOPE *e;
  57         bool sendbody;
  58 {
  59         register SM_FILE_T *fp;
  60         bool panic = false;
  61         int state;
  62         auto ADDRESS *q = NULL;
  63         register char *p;
  64         MCI mcibuf;
  65         int flags;
  66         long sff;
  67         char buf[MAXLINE + 1];
  68         char dlbuf[MAXPATHLEN];
  69         SM_MBDB_T user;
  70
  71
  72         if (tTd(6, 1))
  73         {
  74                 sm_dprintf("\nsavemail, errormode = %c, id = %s, ExitStat = %d\n  e_from=",
  75                         e->e_errormode, e->e_id == NULL ? "NONE" : e->e_id,
  76                         ExitStat);
  77                 printaddr(sm_debug_file(), &e->e_from, false);
  78         }
  79
  80         if (e->e_id == NULL)
  81         {
  82                 /* can't return a message with no id */
  83                 return panic;
  84         }
  85
  86         /*
  87         **  In the unhappy event we don't know who to return the mail
  88         **  to, make someone up.
  89         */
  90
  91         if (e->e_from.q_paddr == NULL)
  92         {
  93                 e->e_sender = "Postmaster";
  94                 if (parseaddr(e->e_sender, &e->e_from,
  95                               RF_COPYPARSE|RF_SENDERADDR,
  96                               '\0', NULL, e, false) == NULL)
  97                 {
  98                         syserr("553 5.3.5 Cannot parse Postmaster!");
  99                         finis(true, true, EX_SOFTWARE);
 100                 }
 101         }
 102         e->e_to = NULL;
 103
 104         /*
 105         **  Basic state machine.
 106         **
 107         **      This machine runs through the following states:
 108         **
 109         **      ESM_QUIET       Errors have already been printed iff the
 110         **                      sender is local.
 111         **      ESM_REPORT      Report directly to the sender's terminal.
 112         **      ESM_MAIL        Mail response to the sender.
 113         **      ESM_DEADLETTER  Save response in ~/dead.letter.
 114         **      ESM_POSTMASTER  Mail response to the postmaster.
 115         **      ESM_DEADLETTERDROP
 116         **                      If DeadLetterDrop set, save it there.
 117         **      ESM_PANIC       Save response anywhere possible.
 118         */
 119
 120         /* determine starting state */
 121         switch (e->e_errormode)
 122         {
 123           case EM_WRITE:
 124                 state = ESM_REPORT;
 125                 break;
 126
 127           case EM_BERKNET:
 128           case EM_MAIL:
 129                 state = ESM_MAIL;
 130                 break;
 131
 132           case EM_PRINT:
 133           case '\0':
 134                 state = ESM_QUIET;
 135                 break;
 136
 137           case EM_QUIET:
 138                 /* no need to return anything at all */
 139                 return panic;
 140
 141           default:
 142                 syserr("554 5.3.0 savemail: bogus errormode x%x",
 143                        e->e_errormode);
 144                 state = ESM_MAIL;
 145                 break;
 146         }
 147
 148         /* if this is already an error response, send to postmaster */
 149         if (bitset(EF_RESPONSE, e->e_flags))
 150         {
 151                 if (e->e_parent != NULL &&
 152                     bitset(EF_RESPONSE, e->e_parent->e_flags))
 153                 {
 154                         /* got an error sending a response -- can it */
 155                         return panic;
 156                 }
 157                 state = ESM_POSTMASTER;
 158         }
 159
 160         while (state != ESM_DONE)
 161         {
 162                 if (tTd(6, 5))
 163                         sm_dprintf("  state %d\n", state);
 164
 165                 switch (state)
 166                 {
 167                   case ESM_QUIET:
 168                         if (bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags))
 169                                 state = ESM_DEADLETTER;
 170                         else
 171                                 state = ESM_MAIL;
 172                         break;
 173
 174                   case ESM_REPORT:
 175
 176                         /*
 177                         **  If the user is still logged in on the same terminal,
 178                         **  then write the error messages back to hir (sic).
 179                         */
 180
 181 #if USE_TTYPATH
 182                         p = ttypath();
 183 #else /* USE_TTYPATH */
 184                         p = NULL;
 185 #endif /* USE_TTYPATH */
 186
 187                         if (p == NULL || sm_io_reopen(SmFtStdio,
 188                                                       SM_TIME_DEFAULT,
 189                                                       p, SM_IO_WRONLY, NULL,
 190                                                       smioout) == NULL)
 191                         {
 192                                 state = ESM_MAIL;
 193                                 break;
 194                         }
 195
 196                         expand("\201n", buf, sizeof(buf), e);
 197                         (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
 198                                              "\r\nMessage from %s...\r\n", buf);
 199                         (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
 200                                              "Errors occurred while sending mail.\r\n");
 201                         if (e->e_xfp != NULL)
 202                         {
 203                                 (void) bfrewind(e->e_xfp);
 204                                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
 205                                                      "Transcript follows:\r\n");
 206                                 while (sm_io_fgets(e->e_xfp, SM_TIME_DEFAULT,
 207                                                    buf, sizeof(buf)) != NULL &&
 208                                        !sm_io_error(smioout))
 209                                         (void) sm_io_fputs(smioout,
 210                                                            SM_TIME_DEFAULT,
 211                                                            buf);
 212                         }
 213                         else
 214                         {
 215                                 syserr("Cannot open %s",
 216                                        queuename(e, XSCRPT_LETTER));
 217                                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
 218                                                      "Transcript of session is unavailable.\r\n");
 219                         }
 220                         (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
 221                                              "Original message will be saved in dead.letter.\r\n");
 222                         state = ESM_DEADLETTER;
 223                         break;
 224
 225                   case ESM_MAIL:
 226                         /*
 227                         **  If mailing back, do it.
 228                         **      Throw away all further output.  Don't alias,
 229                         **      since this could cause loops, e.g., if joe
 230                         **      mails to joe@x, and for some reason the network
 231                         **      for @x is down, then the response gets sent to
 232                         **      joe@x, which gives a response, etc.  Also force
 233                         **      the mail to be delivered even if a version of
 234                         **      it has already been sent to the sender.
 235                         **
 236                         **  If this is a configuration or local software
 237                         **      error, send to the local postmaster as well,
 238                         **      since the originator can't do anything
 239                         **      about it anyway.  Note that this is a full
 240                         **      copy of the message (intentionally) so that
 241                         **      the Postmaster can forward things along.
 242                         */
 243
 244                         if (ExitStat == EX_CONFIG || ExitStat == EX_SOFTWARE)
 245                         {
 246                                 (void) sendtolist("postmaster", NULLADDR,
 247                                                   &e->e_errorqueue, 0, e);
 248                         }
 249                         if (!emptyaddr(&e->e_from))
 250                         {
 251                                 char from[TOBUFSIZE];
 252
 253                                 if (sm_strlcpy(from, e->e_from.q_paddr,
 254                                                 sizeof(from)) >= sizeof(from))
 255                                 {
 256                                         state = ESM_POSTMASTER;
 257                                         break;
 258                                 }
 259
 260                                 if (!DontPruneRoutes)
 261                                         (void) pruneroute(from);
 262
 263                                 (void) sendtolist(from, NULLADDR,
 264                                                   &e->e_errorqueue, 0, e);
 265                         }
 266
 267                         /*
 268                         **  Deliver a non-delivery report to the
 269                         **  Postmaster-designate (not necessarily
 270                         **  Postmaster).  This does not include the
 271                         **  body of the message, for privacy reasons.
 272                         **  You really shouldn't need this.
 273                         */
 274
 275                         e->e_flags |= EF_PM_NOTIFY;
 276
 277                         /* check to see if there are any good addresses */
 278                         for (q = e->e_errorqueue; q != NULL; q = q->q_next)
 279                         {
 280                                 if (QS_IS_SENDABLE(q->q_state))
 281                                         break;
 282                         }
 283                         if (q == NULL)
 284                         {
 285                                 /* this is an error-error */
 286                                 state = ESM_POSTMASTER;
 287                                 break;
 288                         }
 289                         if (returntosender(e->e_message, e->e_errorqueue,
 290                                            sendbody ? RTSF_SEND_BODY
 291                                                     : RTSF_NO_BODY,
 292                                            e) == 0)
 293                         {
 294                                 state = ESM_DONE;
 295                                 break;
 296                         }
 297
 298                         /* didn't work -- return to postmaster */
 299                         state = ESM_POSTMASTER;
 300                         break;
 301
 302                   case ESM_POSTMASTER:
 303                         /*
 304                         **  Similar to previous case, but to system postmaster.
 305                         */
 306
 307                         q = NULL;
 308                         expand(DoubleBounceAddr, buf, sizeof(buf), e);
 309
 310                         /*
 311                         **  Just drop it on the floor if DoubleBounceAddr
 312                         **  expands to an empty string.
 313                         */
 314
 315                         if (*buf == '\0')
 316                         {
 317                                 state = ESM_DONE;
 318                                 break;
 319                         }
 320                         if (sendtolist(buf, NULLADDR, &q, 0, e) <= 0)
 321                         {
 322                                 syserr("553 5.3.0 cannot parse %s!", buf);
 323                                 ExitStat = EX_SOFTWARE;
 324                                 state = ESM_DEADLETTERDROP;
 325                                 break;
 326                         }
 327                         flags = RTSF_PM_BOUNCE;
 328                         if (sendbody)
 329                                 flags |= RTSF_SEND_BODY;
 330                         if (returntosender(e->e_message, q, flags, e) == 0)
 331                         {
 332                                 state = ESM_DONE;
 333                                 break;
 334                         }
 335
 336                         /* didn't work -- last resort */
 337                         state = ESM_DEADLETTERDROP;
 338                         break;
 339
 340                   case ESM_DEADLETTER:
 341                         /*
 342                         **  Save the message in dead.letter.
 343                         **      If we weren't mailing back, and the user is
 344                         **      local, we should save the message in
 345                         **      ~/dead.letter so that the poor person doesn't
 346                         **      have to type it over again -- and we all know
 347                         **      what poor typists UNIX users are.
 348                         */
 349
 350                         p = NULL;
 351                         if (bitnset(M_HASPWENT, e->e_from.q_mailer->m_flags))
 352                         {
 353                                 if (e->e_from.q_home != NULL)
 354                                         p = e->e_from.q_home;
 355                                 else if (sm_mbdb_lookup(e->e_from.q_user, &user)
 356                                          == EX_OK &&
 357                                          *user.mbdb_homedir != '\0')
 358                                         p = user.mbdb_homedir;
 359                         }
 360                         if (p == NULL || e->e_dfp == NULL)
 361                         {
 362                                 /* no local directory or no data file */
 363                                 state = ESM_MAIL;
 364                                 break;
 365                         }
 366
 367                         /* we have a home directory; write dead.letter */
 368                         macdefine(&e->e_macro, A_TEMP, 'z', p);
 369
 370                         /* get the sender for the UnixFromLine */
 371                         p = macvalue('g', e);
 372                         macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
 373
 374                         expand("\201z/dead.letter", dlbuf, sizeof(dlbuf), e);
 375                         sff = SFF_CREAT|SFF_REGONLY|SFF_RUNASREALUID;
 376                         if (RealUid == 0)
 377                                 sff |= SFF_ROOTOK;
 378                         e->e_to = dlbuf;
 379                         if (writable(dlbuf, NULL, sff) &&
 380                             mailfile(dlbuf, FileMailer, NULL, sff, e) == EX_OK)
 381                         {
 382                                 int oldverb = Verbose;
 383
 384                                 if (OpMode != MD_DAEMON && OpMode != MD_SMTP)
 385                                         Verbose = 1;
 386                                 if (Verbose > 0)
 387                                         message("Saved message in %s", dlbuf);
 388                                 Verbose = oldverb;
 389                                 macdefine(&e->e_macro, A_PERM, 'g', p);
 390                                 state = ESM_DONE;
 391                                 break;
 392                         }
 393                         macdefine(&e->e_macro, A_PERM, 'g', p);
 394                         state = ESM_MAIL;
 395                         break;
 396
 397                   case ESM_DEADLETTERDROP:
 398                         /*
 399                         **  Log the mail in DeadLetterDrop file.
 400                         */
 401
 402                         if (e->e_class < 0)
 403                         {
 404                                 state = ESM_DONE;
 405                                 break;
 406                         }
 407
 408                         if ((SafeFileEnv != NULL && SafeFileEnv[0] != '\0') ||
 409                             DeadLetterDrop == NULL ||
 410                             DeadLetterDrop[0] == '\0')
 411                         {
 412                                 state = ESM_PANIC;
 413                                 break;
 414                         }
 415
 416                         sff = SFF_CREAT|SFF_REGONLY|SFF_ROOTOK|SFF_OPENASROOT|SFF_MUSTOWN;
 417                         if (!writable(DeadLetterDrop, NULL, sff) ||
 418                             (fp = safefopen(DeadLetterDrop, O_WRONLY|O_APPEND,
 419                                             FileMode, sff)) == NULL)
 420                         {
 421                                 state = ESM_PANIC;
 422                                 break;
 423                         }
 424
 425                         memset(&mcibuf, '\0', sizeof(mcibuf));
 426                         mcibuf.mci_out = fp;
 427                         mcibuf.mci_mailer = FileMailer;
 428                         if (bitnset(M_7BITS, FileMailer->m_flags))
 429                                 mcibuf.mci_flags |= MCIF_7BIT;
 430
 431                         /* get the sender for the UnixFromLine */
 432                         p = macvalue('g', e);
 433                         macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
 434
 435                         if (!putfromline(&mcibuf, e) ||
 436                             !(*e->e_puthdr)(&mcibuf, e->e_header, e,
 437                                         M87F_OUTER) ||
 438                             !(*e->e_putbody)(&mcibuf, e, NULL) ||
 439                             !putline("\n", &mcibuf) ||
 440                             sm_io_flush(fp, SM_TIME_DEFAULT) == SM_IO_EOF ||
 441                             sm_io_error(fp) ||
 442                             sm_io_close(fp, SM_TIME_DEFAULT) < 0)
 443                                 state = ESM_PANIC;
 444                         else
 445                         {
 446                                 int oldverb = Verbose;
 447
 448                                 if (OpMode != MD_DAEMON && OpMode != MD_SMTP)
 449                                         Verbose = 1;
 450                                 if (Verbose > 0)
 451                                         message("Saved message in %s",
 452                                                 DeadLetterDrop);
 453                                 Verbose = oldverb;
 454                                 if (LogLevel > 3)
 455                                         sm_syslog(LOG_NOTICE, e->e_id,
 456                                                   "Saved message in %s",
 457                                                   DeadLetterDrop);
 458                                 state = ESM_DONE;
 459                         }
 460                         macdefine(&e->e_macro, A_PERM, 'g', p);
 461                         break;
 462
 463                   default:
 464                         syserr("554 5.3.5 savemail: unknown state %d", state);
 465                         /* FALLTHROUGH */
 466
 467                   case ESM_PANIC:
 468                         /* leave the locked queue & transcript files around */
 469                         loseqfile(e, "savemail panic");
 470                         panic = true;
 471                         errno = 0;
 472                         syserr("554 savemail: cannot save rejected email anywhere");
 473                         state = ESM_DONE;
 474                         break;
 475                 }
 476         }
 477         return panic;
 478 }
 479 /*
 480 **  RETURNTOSENDER -- return a message to the sender with an error.
 481 **
 482 **      Parameters:
 483 **              msg -- the explanatory message.
 484 **              returnq -- the queue of people to send the message to.
 485 **              flags -- flags tweaking the operation:
 486 **                      RTSF_SENDBODY -- include body of message (otherwise
 487 **                              just send the header).
 488 **                      RTSF_PMBOUNCE -- this is a postmaster bounce.
 489 **              e -- the current envelope.
 490 **
 491 **      Returns:
 492 **              zero -- if everything went ok.
 493 **              else -- some error.
 494 **
 495 **      Side Effects:
 496 **              Returns the current message to the sender via mail.
 497 */
 498
 499 #define MAXRETURNS      6       /* max depth of returning messages */
 500 #define ERRORFUDGE      1024    /* nominal size of error message text */
 501
 502 int
 503 returntosender(msg, returnq, flags, e)
 504         char *msg;
 505         ADDRESS *returnq;
 506         int flags;
 507         register ENVELOPE *e;
 508 {
 509         register ENVELOPE *ee;
 510         ENVELOPE *oldcur = CurEnv;
 511         ENVELOPE errenvelope;
 512         static int returndepth = 0;
 513         register ADDRESS *q;
 514         char *p;
 515         char buf[MAXNAME + 1];
 516
 517         if (returnq == NULL)
 518                 return -1;
 519
 520         if (msg == NULL)
 521                 msg = "Unable to deliver mail";
 522
 523         if (tTd(6, 1))
 524         {
 525                 sm_dprintf("\n*** Return To Sender: msg=\"%s\", depth=%d, e=%p, returnq=",
 526                         msg, returndepth, e);
 527                 printaddr(sm_debug_file(), returnq, true);
 528                 if (tTd(6, 20))
 529                 {
 530                         sm_dprintf("Sendq=");
 531                         printaddr(sm_debug_file(), e->e_sendqueue, true);
 532                 }
 533         }
 534
 535         if (++returndepth >= MAXRETURNS)
 536         {
 537                 if (returndepth != MAXRETURNS)
 538                         syserr("554 5.3.0 returntosender: infinite recursion on %s",
 539                                returnq->q_paddr);
 540                 /* don't "unrecurse" and fake a clean exit */
 541                 /* returndepth--; */
 542                 return 0;
 543         }
 544
 545         macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
 546         macdefine(&e->e_macro, A_PERM, 'u', NULL);
 547
 548         /* initialize error envelope */
 549         ee = newenvelope(&errenvelope, e, sm_rpool_new_x(NULL));
 550         macdefine(&ee->e_macro, A_PERM, 'a', "\201b");
 551         macdefine(&ee->e_macro, A_PERM, 'r', "");
 552         macdefine(&ee->e_macro, A_PERM, 's', "localhost");
 553         macdefine(&ee->e_macro, A_PERM, '_', "localhost");
 554         clrsessenvelope(ee);
 555
 556         ee->e_puthdr = putheader;
 557         ee->e_putbody = errbody;
 558         ee->e_flags |= EF_RESPONSE|EF_METOO;
 559         if (!bitset(EF_OLDSTYLE, e->e_flags))
 560                 ee->e_flags &= ~EF_OLDSTYLE;
 561         if (bitset(EF_DONT_MIME, e->e_flags))
 562         {
 563                 ee->e_flags |= EF_DONT_MIME;
 564
 565                 /*
 566                 **  If we can't convert to MIME and we don't pass
 567                 **  8-bit, we can't send the body.
 568                 */
 569
 570                 if (bitset(EF_HAS8BIT, e->e_flags) &&
 571                     !bitset(MM_PASS8BIT, MimeMode))
 572                         flags &= ~RTSF_SEND_BODY;
 573         }
 574
 575         ee->e_sendqueue = returnq;
 576         ee->e_msgsize = 0;
 577         if (bitset(RTSF_SEND_BODY, flags) &&
 578             !bitset(PRIV_NOBODYRETN, PrivacyFlags))
 579                 ee->e_msgsize = ERRORFUDGE + e->e_msgsize;
 580         else
 581                 ee->e_flags |= EF_NO_BODY_RETN;
 582
 583         if (!setnewqueue(ee))
 584         {
 585                 syserr("554 5.3.0 returntosender: cannot select queue for %s",
 586                                returnq->q_paddr);
 587                 ExitStat = EX_UNAVAILABLE;
 588                 returndepth--;
 589                 return -1;
 590         }
 591         initsys(ee);
 592
 593 #if NAMED_BIND
 594         _res.retry = TimeOuts.res_retry[RES_TO_FIRST];
 595         _res.retrans = TimeOuts.res_retrans[RES_TO_FIRST];
 596 #endif /* NAMED_BIND */
 597         for (q = returnq; q != NULL; q = q->q_next)
 598         {
 599                 if (QS_IS_BADADDR(q->q_state))
 600                         continue;
 601
 602                 q->q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
 603                 q->q_flags |= QPINGONFAILURE;
 604
 605                 if (!QS_IS_DEAD(q->q_state))
 606                         ee->e_nrcpts++;
 607
 608                 if (q->q_alias == NULL)
 609                         addheader("To", q->q_paddr, 0, ee, true);
 610         }
 611
 612         if (LogLevel > 5)
 613         {
 614                 if (bitset(EF_RESPONSE, e->e_flags))
 615                         p = "return to sender";
 616                 else if (bitset(EF_WARNING, e->e_flags))
 617                         p = "sender notify";
 618                 else if (bitset(RTSF_PM_BOUNCE, flags))
 619                         p = "postmaster notify";
 620                 else
 621                         p = "DSN";
 622                 sm_syslog(LOG_INFO, e->e_id, "%s: %s: %s",
 623                           ee->e_id, p, shortenstring(msg, MAXSHORTSTR));
 624         }
 625
 626         if (SendMIMEErrors)
 627         {
 628                 addheader("MIME-Version", "1.0", 0, ee, true);
 629                 (void) sm_snprintf(buf, sizeof(buf), "%s.%ld/%.100s",
 630                                 ee->e_id, (long)curtime(), MyHostName);
 631                 ee->e_msgboundary = sm_rpool_strdup_x(ee->e_rpool, buf);
 632                 (void) sm_snprintf(buf, sizeof(buf),
 633 #if DSN
 634                                 "multipart/report; report-type=delivery-status;\n\tboundary=\"%s\"",
 635 #else /* DSN */
 636                                 "multipart/mixed; boundary=\"%s\"",
 637 #endif /* DSN */
 638                                 ee->e_msgboundary);
 639                 addheader("Content-Type", buf, 0, ee, true);
 640
 641                 p = hvalue("Content-Transfer-Encoding", e->e_header);
 642                 if (p != NULL && sm_strcasecmp(p, "binary") != 0)
 643                         p = NULL;
 644                 if (p == NULL && bitset(EF_HAS8BIT, e->e_flags))
 645                         p = "8bit";
 646                 if (p != NULL)
 647                         addheader("Content-Transfer-Encoding", p, 0, ee, true);
 648         }
 649         if (strncmp(msg, "Warning:", 8) == 0)
 650         {
 651                 addheader("Subject", msg, 0, ee, true);
 652                 p = "warning-timeout";
 653         }
 654         else if (strncmp(msg, "Postmaster warning:", 19) == 0)
 655         {
 656                 addheader("Subject", msg, 0, ee, true);
 657                 p = "postmaster-warning";
 658         }
 659         else if (strcmp(msg, "Return receipt") == 0)
 660         {
 661                 addheader("Subject", msg, 0, ee, true);
 662                 p = "return-receipt";
 663         }
 664         else if (bitset(RTSF_PM_BOUNCE, flags))
 665         {
 666                 (void) sm_snprintf(buf, sizeof(buf),
 667                          "Postmaster notify: see transcript for details");
 668                 addheader("Subject", buf, 0, ee, true);
 669                 p = "postmaster-notification";
 670         }
 671         else
 672         {
 673                 (void) sm_snprintf(buf, sizeof(buf),
 674                          "Returned mail: see transcript for details");
 675                 addheader("Subject", buf, 0, ee, true);
 676                 p = "failure";
 677         }
 678         (void) sm_snprintf(buf, sizeof(buf), "auto-generated (%s)", p);
 679         addheader("Auto-Submitted", buf, 0, ee, true);
 680
 681         /* fake up an address header for the from person */
 682         expand("\201n", buf, sizeof(buf), e);
 683         if (parseaddr(buf, &ee->e_from,
 684                       RF_COPYALL|RF_SENDERADDR, '\0', NULL, e, false) == NULL)
 685         {
 686                 syserr("553 5.3.5 Can't parse myself!");
 687                 ExitStat = EX_SOFTWARE;
 688                 returndepth--;
 689                 return -1;
 690         }
 691         ee->e_from.q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
 692         ee->e_from.q_flags |= QPINGONFAILURE;
 693         ee->e_sender = ee->e_from.q_paddr;
 694
 695         /* push state into submessage */
 696         CurEnv = ee;
 697         macdefine(&ee->e_macro, A_PERM, 'f', "\201n");
 698         macdefine(&ee->e_macro, A_PERM, 'x', "Mail Delivery Subsystem");
 699         eatheader(ee, true, true);
 700
 701         /* mark statistics */
 702         markstats(ee, NULLADDR, STATS_NORMAL);
 703
 704         /* actually deliver the error message */
 705         sendall(ee, SM_DELIVER);
 706
 707         /* restore state */
 708         (void) dropenvelope(ee, true, false);
 709         sm_rpool_free(ee->e_rpool);
 710         CurEnv = oldcur;
 711         returndepth--;
 712
 713         /* check for delivery errors */
 714         if (ee->e_parent == NULL ||
 715             !bitset(EF_RESPONSE, ee->e_parent->e_flags))
 716                 return 0;
 717         for (q = ee->e_sendqueue; q != NULL; q = q->q_next)
 718         {
 719                 if (QS_IS_ATTEMPTED(q->q_state))
 720                         return 0;
 721         }
 722         return -1;
 723 }
 724 /*
 725 **  ERRBODY -- output the body of an error message.
 726 **
 727 **      Typically this is a copy of the transcript plus a copy of the
 728 **      original offending message.
 729 **
 730 **      Parameters:
 731 **              mci -- the mailer connection information.
 732 **              e -- the envelope we are working in.
 733 **              separator -- any possible MIME separator (unused).
 734 **
 735 **      Returns:
 736 **              true iff body was written successfully
 737 **
 738 **      Side Effects:
 739 **              Outputs the body of an error message.
 740 */
 741
 742 /* ARGSUSED2 */
 743 static bool
 744 errbody(mci, e, separator)
 745         register MCI *mci;
 746         register ENVELOPE *e;
 747         char *separator;
 748 {
 749         bool printheader;
 750         bool sendbody;
 751         bool pm_notify;
 752         int save_errno;
 753         register SM_FILE_T *xfile;
 754         char *p;
 755         register ADDRESS *q = NULL;
 756         char actual[MAXLINE];
 757         char buf[MAXLINE];
 758
 759         if (bitset(MCIF_INHEADER, mci->mci_flags))
 760         {
 761                 if (!putline("", mci))
 762                         goto writeerr;
 763                 mci->mci_flags &= ~MCIF_INHEADER;
 764         }
 765         if (e->e_parent == NULL)
 766         {
 767                 syserr("errbody: null parent");
 768                 if (!putline("   ----- Original message lost -----\n", mci))
 769                         goto writeerr;
 770                 return true;
 771         }
 772
 773         /*
 774         **  Output MIME header.
 775         */
 776
 777         if (e->e_msgboundary != NULL)
 778         {
 779                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
 780                 if (!putline("This is a MIME-encapsulated message", mci) ||
 781                     !putline("", mci) ||
 782                     !putline(buf, mci) ||
 783                     !putline("", mci))
 784                         goto writeerr;
 785         }
 786
 787         /*
 788         **  Output introductory information.
 789         */
 790
 791         pm_notify = false;
 792         p = hvalue("subject", e->e_header);
 793         if (p != NULL && strncmp(p, "Postmaster ", 11) == 0)
 794                 pm_notify = true;
 795         else
 796         {
 797                 for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 798                 {
 799                         if (QS_IS_BADADDR(q->q_state))
 800                                 break;
 801                 }
 802         }
 803         if (!pm_notify && q == NULL &&
 804             !bitset(EF_FATALERRS|EF_SENDRECEIPT, e->e_parent->e_flags))
 805         {
 806                 if (!putline("    **********************************************",
 807                         mci) ||
 808                     !putline("    **      THIS IS A WARNING MESSAGE ONLY      **",
 809                         mci) ||
 810                     !putline("    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **",
 811                         mci) ||
 812                     !putline("    **********************************************",
 813                         mci) ||
 814                     !putline("", mci))
 815                         goto writeerr;
 816         }
 817         (void) sm_snprintf(buf, sizeof(buf),
 818                 "The original message was received at %s",
 819                 arpadate(ctime(&e->e_parent->e_ctime)));
 820         if (!putline(buf, mci))
 821                 goto writeerr;
 822         expand("from \201_", buf, sizeof(buf), e->e_parent);
 823         if (!putline(buf, mci))
 824                 goto writeerr;
 825
 826         /* include id in postmaster copies */
 827         if (pm_notify && e->e_parent->e_id != NULL)
 828         {
 829                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "with id ",
 830                         e->e_parent->e_id);
 831                 if (!putline(buf, mci))
 832                         goto writeerr;
 833         }
 834         if (!putline("", mci))
 835                 goto writeerr;
 836
 837         /*
 838         **  Output error message header (if specified and available).
 839         */
 840
 841         if (ErrMsgFile != NULL &&
 842             !bitset(EF_SENDRECEIPT, e->e_parent->e_flags))
 843         {
 844                 if (*ErrMsgFile == '/')
 845                 {
 846                         long sff = SFF_ROOTOK|SFF_REGONLY;
 847
 848                         if (DontLockReadFiles)
 849                                 sff |= SFF_NOLOCK;
 850                         if (!bitnset(DBS_ERRORHEADERINUNSAFEDIRPATH,
 851                                      DontBlameSendmail))
 852                                 sff |= SFF_SAFEDIRPATH;
 853                         xfile = safefopen(ErrMsgFile, O_RDONLY, 0444, sff);
 854                         if (xfile != NULL)
 855                         {
 856                                 while (sm_io_fgets(xfile, SM_TIME_DEFAULT, buf,
 857                                                    sizeof(buf)) != NULL)
 858                                 {
 859                                         int lbs;
 860                                         bool putok;
 861                                         char *lbp;
 862
 863                                         lbs = sizeof(buf);
 864                                         lbp = translate_dollars(buf, buf, &lbs);
 865                                         expand(lbp, lbp, lbs, e);
 866                                         putok = putline(lbp, mci);
 867                                         if (lbp != buf)
 868                                                 sm_free(lbp);
 869                                         if (!putok)
 870                                                 goto writeerr;
 871                                 }
 872                                 (void) sm_io_close(xfile, SM_TIME_DEFAULT);
 873                                 if (!putline("\n", mci))
 874                                         goto writeerr;
 875                         }
 876                 }
 877                 else
 878                 {
 879                         expand(ErrMsgFile, buf, sizeof(buf), e);
 880                         if (!putline(buf, mci) || !putline("", mci))
 881                                 goto writeerr;
 882                 }
 883         }
 884
 885         /*
 886         **  Output message introduction
 887         */
 888
 889         /* permanent fatal errors */
 890         printheader = true;
 891         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 892         {
 893                 if (!QS_IS_BADADDR(q->q_state) ||
 894                     !bitset(QPINGONFAILURE, q->q_flags))
 895                         continue;
 896
 897                 if (printheader)
 898                 {
 899                         if (!putline("   ----- The following addresses had permanent fatal errors -----",
 900                                         mci))
 901                                 goto writeerr;
 902                         printheader = false;
 903                 }
 904
 905                 (void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
 906                                   sizeof(buf));
 907                 if (!putline(buf, mci))
 908                         goto writeerr;
 909                 if (q->q_rstatus != NULL)
 910                 {
 911                         (void) sm_snprintf(buf, sizeof(buf),
 912                                 "    (reason: %s)",
 913                                 shortenstring(exitstat(q->q_rstatus),
 914                                               MAXSHORTSTR));
 915                         if (!putline(buf, mci))
 916                                 goto writeerr;
 917                 }
 918                 if (q->q_alias != NULL)
 919                 {
 920                         (void) sm_snprintf(buf, sizeof(buf),
 921                                 "    (expanded from: %s)",
 922                                 shortenstring(q->q_alias->q_paddr,
 923                                               MAXSHORTSTR));
 924                         if (!putline(buf, mci))
 925                                 goto writeerr;
 926                 }
 927         }
 928         if (!printheader && !putline("", mci))
 929                 goto writeerr;
 930
 931         /* transient non-fatal errors */
 932         printheader = true;
 933         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 934         {
 935                 if (QS_IS_BADADDR(q->q_state) ||
 936                     !bitset(QPRIMARY, q->q_flags) ||
 937                     !bitset(QBYNDELAY, q->q_flags) ||
 938                     !bitset(QDELAYED, q->q_flags))
 939                         continue;
 940
 941                 if (printheader)
 942                 {
 943                         if (!putline("   ----- The following addresses had transient non-fatal errors -----",
 944                                         mci))
 945                                 goto writeerr;
 946                         printheader = false;
 947                 }
 948
 949                 (void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
 950                                   sizeof(buf));
 951                 if (!putline(buf, mci))
 952                         goto writeerr;
 953                 if (q->q_alias != NULL)
 954                 {
 955                         (void) sm_snprintf(buf, sizeof(buf),
 956                                 "    (expanded from: %s)",
 957                                 shortenstring(q->q_alias->q_paddr,
 958                                               MAXSHORTSTR));
 959                         if (!putline(buf, mci))
 960                                 goto writeerr;
 961                 }
 962         }
 963         if (!printheader && !putline("", mci))
 964                 goto writeerr;
 965
 966         /* successful delivery notifications */
 967         printheader = true;
 968         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 969         {
 970                 if (QS_IS_BADADDR(q->q_state) ||
 971                     !bitset(QPRIMARY, q->q_flags) ||
 972                     bitset(QBYNDELAY, q->q_flags) ||
 973                     bitset(QDELAYED, q->q_flags))
 974                         continue;
 975                 else if (bitset(QBYNRELAY, q->q_flags))
 976                         p = "Deliver-By notify: relayed";
 977                 else if (bitset(QBYTRACE, q->q_flags))
 978                         p = "Deliver-By trace: relayed";
 979                 else if (!bitset(QPINGONSUCCESS, q->q_flags))
 980                         continue;
 981                 else if (bitset(QRELAYED, q->q_flags))
 982                         p = "relayed to non-DSN-aware mailer";
 983                 else if (bitset(QDELIVERED, q->q_flags))
 984                 {
 985                         if (bitset(QEXPANDED, q->q_flags))
 986                                 p = "successfully delivered to mailing list";
 987                         else
 988                                 p = "successfully delivered to mailbox";
 989                 }
 990                 else if (bitset(QEXPANDED, q->q_flags))
 991                         p = "expanded by alias";
 992                 else
 993                         continue;
 994
 995                 if (printheader)
 996                 {
 997                         if (!putline("   ----- The following addresses had successful delivery notifications -----",
 998                                         mci))
 999                                 goto writeerr;
1000                         printheader = false;
1001                 }
1002
1003                 (void) sm_snprintf(buf, sizeof(buf), "%s  (%s)",
1004                          shortenstring(q->q_paddr, MAXSHORTSTR), p);
1005                 if (!putline(buf, mci))
1006                         goto writeerr;
1007                 if (q->q_alias != NULL)
1008                 {
1009                         (void) sm_snprintf(buf, sizeof(buf),
1010                                 "    (expanded from: %s)",
1011                                 shortenstring(q->q_alias->q_paddr,
1012                                               MAXSHORTSTR));
1013                         if (!putline(buf, mci))
1014                                 goto writeerr;
1015                 }
1016         }
1017         if (!printheader && !putline("", mci))
1018                 goto writeerr;
1019
1020         /*
1021         **  Output transcript of errors
1022         */
1023
1024         (void) sm_io_flush(smioout, SM_TIME_DEFAULT);
1025         if (e->e_parent->e_xfp == NULL)
1026         {
1027                 if (!putline("   ----- Transcript of session is unavailable -----\n",
1028                                 mci))
1029                         goto writeerr;
1030         }
1031         else
1032         {
1033                 printheader = true;
1034                 (void) bfrewind(e->e_parent->e_xfp);
1035                 if (e->e_xfp != NULL)
1036                         (void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
1037                 while (sm_io_fgets(e->e_parent->e_xfp, SM_TIME_DEFAULT, buf,
1038                                    sizeof(buf)) != NULL)
1039                 {
1040                         if (printheader && !putline("   ----- Transcript of session follows -----\n",
1041                                                 mci))
1042                                 goto writeerr;
1043                         printheader = false;
1044                         if (!putline(buf, mci))
1045                                 goto writeerr;
1046                 }
1047         }
1048         errno = 0;
1049
1050 #if DSN
1051         /*
1052         **  Output machine-readable version.
1053         */
1054
1055         if (e->e_msgboundary != NULL)
1056         {
1057                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
1058                 if (!putline("", mci) ||
1059                     !putline(buf, mci) ||
1060                     !putline("Content-Type: message/delivery-status", mci) ||
1061                     !putline("", mci))
1062                         goto writeerr;
1063
1064                 /*
1065                 **  Output per-message information.
1066                 */
1067
1068                 /* original envelope id from MAIL FROM: line */
1069                 if (e->e_parent->e_envid != NULL)
1070                 {
1071                         (void) sm_snprintf(buf, sizeof(buf),
1072                                         "Original-Envelope-Id: %.800s",
1073                                         xuntextify(e->e_parent->e_envid));
1074                         if (!putline(buf, mci))
1075                                 goto writeerr;
1076                 }
1077
1078                 /* Reporting-MTA: is us (required) */
1079                 (void) sm_snprintf(buf, sizeof(buf),
1080                                    "Reporting-MTA: dns; %.800s", MyHostName);
1081                 if (!putline(buf, mci))
1082                         goto writeerr;
1083
1084                 /* DSN-Gateway: not relevant since we are not translating */
1085
1086                 /* Received-From-MTA: shows where we got this message from */
1087                 if (RealHostName != NULL)
1088                 {
1089                         /* XXX use $s for type? */
1090                         if (e->e_parent->e_from.q_mailer == NULL ||
1091                             (p = e->e_parent->e_from.q_mailer->m_mtatype) == NULL)
1092                                 p = "dns";
1093                         (void) sm_snprintf(buf, sizeof(buf),
1094                                         "Received-From-MTA: %s; %.800s",
1095                                         p, RealHostName);
1096                         if (!putline(buf, mci))
1097                                 goto writeerr;
1098                 }
1099
1100                 /* Arrival-Date: -- when it arrived here */
1101                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "Arrival-Date: ",
1102                                 arpadate(ctime(&e->e_parent->e_ctime)));
1103                 if (!putline(buf, mci))
1104                         goto writeerr;
1105
1106                 /* Deliver-By-Date: -- when it should have been delivered */
1107                 if (IS_DLVR_BY(e->e_parent))
1108                 {
1109                         time_t dbyd;
1110
1111                         dbyd = e->e_parent->e_ctime + e->e_parent->e_deliver_by;
1112                         (void) sm_strlcpyn(buf, sizeof(buf), 2,
1113                                         "Deliver-By-Date: ",
1114                                         arpadate(ctime(&dbyd)));
1115                         if (!putline(buf, mci))
1116                                 goto writeerr;
1117                 }
1118
1119                 /*
1120                 **  Output per-address information.
1121                 */
1122
1123                 for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
1124                 {
1125                         char *action;
1126
1127                         if (QS_IS_BADADDR(q->q_state))
1128                         {
1129                                 /* RFC 1891, 6.2.6 (b) */
1130                                 if (bitset(QHASNOTIFY, q->q_flags) &&
1131                                     !bitset(QPINGONFAILURE, q->q_flags))
1132                                         continue;
1133                                 action = "failed";
1134                         }
1135                         else if (!bitset(QPRIMARY, q->q_flags))
1136                                 continue;
1137                         else if (bitset(QDELIVERED, q->q_flags))
1138                         {
1139                                 if (bitset(QEXPANDED, q->q_flags))
1140                                         action = "delivered (to mailing list)";
1141                                 else
1142                                         action = "delivered (to mailbox)";
1143                         }
1144                         else if (bitset(QRELAYED, q->q_flags))
1145                                 action = "relayed (to non-DSN-aware mailer)";
1146                         else if (bitset(QEXPANDED, q->q_flags))
1147                                 action = "expanded (to multi-recipient alias)";
1148                         else if (bitset(QDELAYED, q->q_flags))
1149                                 action = "delayed";
1150                         else if (bitset(QBYTRACE, q->q_flags))
1151                                 action = "relayed (Deliver-By trace mode)";
1152                         else if (bitset(QBYNDELAY, q->q_flags))
1153                                 action = "delayed (Deliver-By notify mode)";
1154                         else if (bitset(QBYNRELAY, q->q_flags))
1155                                 action = "relayed (Deliver-By notify mode)";
1156                         else
1157                                 continue;
1158
1159                         if (!putline("", mci))
1160                                 goto writeerr;
1161
1162                         /* Original-Recipient: -- passed from on high */
1163                         if (q->q_orcpt != NULL)
1164                         {
1165                                 (void) sm_snprintf(buf, sizeof(buf),
1166                                                 "Original-Recipient: %.800s",
1167                                                 q->q_orcpt);
1168                                 if (!putline(buf, mci))
1169                                         goto writeerr;
1170                         }
1171
1172                         /* Figure out actual recipient */
1173                         actual[0] = '\0';
1174                         if (q->q_user[0] != '\0')
1175                         {
1176                                 if (q->q_mailer != NULL &&
1177                                     q->q_mailer->m_addrtype != NULL)
1178                                         p = q->q_mailer->m_addrtype;
1179                                 else
1180                                         p = "rfc822";
1181
1182                                 if (sm_strcasecmp(p, "rfc822") == 0 &&
1183                                     strchr(q->q_user, '@') == NULL)
1184                                 {
1185                                         (void) sm_snprintf(actual,
1186                                                            sizeof(actual),
1187                                                            "%s; %.700s@%.100s",
1188                                                            p, q->q_user,
1189                                                            MyHostName);
1190                                 }
1191                                 else
1192                                 {
1193                                         (void) sm_snprintf(actual,
1194                                                            sizeof(actual),
1195                                                            "%s; %.800s",
1196                                                            p, q->q_user);
1197                                 }
1198                         }
1199
1200                         /* Final-Recipient: -- the name from the RCPT command */
1201                         if (q->q_finalrcpt == NULL)
1202                         {
1203                                 /* should never happen */
1204                                 sm_syslog(LOG_ERR, e->e_id,
1205                                           "returntosender: q_finalrcpt is NULL");
1206
1207                                 /* try to fall back to the actual recipient */
1208                                 if (actual[0] != '\0')
1209                                         q->q_finalrcpt = sm_rpool_strdup_x(e->e_rpool,
1210                                                                            actual);
1211                         }
1212
1213                         if (q->q_finalrcpt != NULL)
1214                         {
1215                                 (void) sm_snprintf(buf, sizeof(buf),
1216                                                    "Final-Recipient: %s",
1217                                                    q->q_finalrcpt);
1218                                 if (!putline(buf, mci))
1219                                         goto writeerr;
1220                         }
1221
1222                         /* X-Actual-Recipient: -- the real problem address */
1223                         if (actual[0] != '\0' &&
1224                             q->q_finalrcpt != NULL &&
1225                             !bitset(PRIV_NOACTUALRECIPIENT, PrivacyFlags) &&
1226                             strcmp(actual, q->q_finalrcpt) != 0)
1227                         {
1228                                 (void) sm_snprintf(buf, sizeof(buf),
1229                                                    "X-Actual-Recipient: %s",
1230                                                    actual);
1231                                 if (!putline(buf, mci))
1232                                         goto writeerr;
1233                         }
1234
1235                         /* Action: -- what happened? */
1236                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Action: ",
1237                                 action);
1238                         if (!putline(buf, mci))
1239                                 goto writeerr;
1240
1241                         /* Status: -- what _really_ happened? */
1242                         if (q->q_status != NULL)
1243                                 p = q->q_status;
1244                         else if (QS_IS_BADADDR(q->q_state))
1245                                 p = "5.0.0";
1246                         else if (QS_IS_QUEUEUP(q->q_state))
1247                                 p = "4.0.0";
1248                         else
1249                                 p = "2.0.0";
1250                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Status: ", p);
1251                         if (!putline(buf, mci))
1252                                 goto writeerr;
1253
1254                         /* Remote-MTA: -- who was I talking to? */
1255                         if (q->q_statmta != NULL)
1256                         {
1257                                 if (q->q_mailer == NULL ||
1258                                     (p = q->q_mailer->m_mtatype) == NULL)
1259                                         p = "dns";
1260                                 (void) sm_snprintf(buf, sizeof(buf),
1261                                                 "Remote-MTA: %s; %.800s",
1262                                                 p, q->q_statmta);
1263                                 p = &buf[strlen(buf) - 1];
1264                                 if (*p == '.')
1265                                         *p = '\0';
1266                                 if (!putline(buf, mci))
1267                                         goto writeerr;
1268                         }
1269
1270                         /* Diagnostic-Code: -- actual result from other end */
1271                         if (q->q_rstatus != NULL)
1272                         {
1273                                 if (q->q_mailer == NULL ||
1274                                     (p = q->q_mailer->m_diagtype) == NULL)
1275                                         p = "smtp";
1276                                 (void) sm_snprintf(buf, sizeof(buf),
1277                                                 "Diagnostic-Code: %s; %.800s",
1278                                                 p, q->q_rstatus);
1279                                 if (!putline(buf, mci))
1280                                         goto writeerr;
1281                         }
1282
1283                         /* Last-Attempt-Date: -- fine granularity */
1284                         if (q->q_statdate == (time_t) 0L)
1285                                 q->q_statdate = curtime();
1286                         (void) sm_strlcpyn(buf, sizeof(buf), 2,
1287                                         "Last-Attempt-Date: ",
1288                                         arpadate(ctime(&q->q_statdate)));
1289                         if (!putline(buf, mci))
1290                                 goto writeerr;
1291
1292                         /* Will-Retry-Until: -- for delayed messages only */
1293                         if (QS_IS_QUEUEUP(q->q_state))
1294                         {
1295                                 time_t xdate;
1296
1297                                 xdate = e->e_parent->e_ctime +
1298                                         TimeOuts.to_q_return[e->e_parent->e_timeoutclass];
1299                                 (void) sm_strlcpyn(buf, sizeof(buf), 2,
1300                                          "Will-Retry-Until: ",
1301                                          arpadate(ctime(&xdate)));
1302                                 if (!putline(buf, mci))
1303                                         goto writeerr;
1304                         }
1305                 }
1306         }
1307 #endif /* DSN */
1308
1309         /*
1310         **  Output text of original message
1311         */
1312
1313         if (!putline("", mci))
1314                 goto writeerr;
1315         if (bitset(EF_HAS_DF, e->e_parent->e_flags))
1316         {
1317                 sendbody = !bitset(EF_NO_BODY_RETN, e->e_parent->e_flags) &&
1318                            !bitset(EF_NO_BODY_RETN, e->e_flags);
1319
1320                 if (e->e_msgboundary == NULL)
1321                 {
1322                         if (!putline(
1323                                 sendbody
1324                                 ? "   ----- Original message follows -----\n"
1325                                 : "   ----- Message header follows -----\n",
1326                                 mci))
1327                         {
1328                                 goto writeerr;
1329                         }
1330                 }
1331                 else
1332                 {
1333                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "--",
1334                                         e->e_msgboundary);
1335
1336                         if (!putline(buf, mci))
1337                                 goto writeerr;
1338                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Content-Type: ",
1339                                         sendbody ? "message/rfc822"
1340                                                  : "text/rfc822-headers");
1341                         if (!putline(buf, mci))
1342                                 goto writeerr;
1343
1344                         p = hvalue("Content-Transfer-Encoding",
1345                                    e->e_parent->e_header);
1346                         if (p != NULL && sm_strcasecmp(p, "binary") != 0)
1347                                 p = NULL;
1348                         if (p == NULL &&
1349                             bitset(EF_HAS8BIT, e->e_parent->e_flags))
1350                                 p = "8bit";
1351                         if (p != NULL)
1352                         {
1353                                 (void) sm_snprintf(buf, sizeof(buf),
1354                                                 "Content-Transfer-Encoding: %s",
1355                                                 p);
1356                                 if (!putline(buf, mci))
1357                                         goto writeerr;
1358                         }
1359                 }
1360                 if (!putline("", mci))
1361                         goto writeerr;
1362                 save_errno = errno;
1363                 if (!putheader(mci, e->e_parent->e_header, e->e_parent,
1364                                 M87F_OUTER))
1365                         goto writeerr;
1366                 errno = save_errno;
1367                 if (sendbody)
1368                 {
1369                         if (!putbody(mci, e->e_parent, e->e_msgboundary))
1370                                 goto writeerr;
1371                 }
1372                 else if (e->e_msgboundary == NULL)
1373                 {
1374                         if (!putline("", mci) ||
1375                             !putline("   ----- Message body suppressed -----",
1376                                         mci))
1377                         {
1378                                 goto writeerr;
1379                         }
1380                 }
1381         }
1382         else if (e->e_msgboundary == NULL)
1383         {
1384                 if (!putline("  ----- No message was collected -----\n", mci))
1385                         goto writeerr;
1386         }
1387
1388         if (e->e_msgboundary != NULL)
1389         {
1390                 (void) sm_strlcpyn(buf, sizeof(buf), 3, "--", e->e_msgboundary,
1391                                    "--");
1392                 if (!putline("", mci) || !putline(buf, mci))
1393                         goto writeerr;
1394         }
1395         if (!putline("", mci) ||
1396             sm_io_flush(mci->mci_out, SM_TIME_DEFAULT) == SM_IO_EOF)
1397                         goto writeerr;
1398
1399         /*
1400         **  Cleanup and exit
1401         */
1402
1403         if (errno != 0)
1404         {
1405   writeerr:
1406                 syserr("errbody: I/O error");
1407                 return false;
1408         }
1409         return true;
1410 }
1411
1412 /*
1413 **  SMTPTODSN -- convert SMTP to DSN status code
1414 **
1415 **      Parameters:
1416 **              smtpstat -- the smtp status code (e.g., 550).
1417 **
1418 **      Returns:
1419 **              The DSN version of the status code.
1420 **
1421 **      Storage Management:
1422 **              smtptodsn() returns a pointer to a character string literal,
1423 **              which will remain valid forever, and thus does not need to
1424 **              be copied.  Current code relies on this property.
1425 */
1426
1427 char *
1428 smtptodsn(smtpstat)
1429         int smtpstat;
1430 {
1431         if (smtpstat < 0)
1432                 return "4.4.2";
1433
1434         switch (smtpstat)
1435         {
1436           case 450:     /* Req mail action not taken: mailbox unavailable */
1437                 return "4.2.0";
1438
1439           case 451:     /* Req action aborted: local error in processing */
1440                 return "4.3.0";
1441
1442           case 452:     /* Req action not taken: insufficient sys storage */
1443                 return "4.3.1";
1444
1445           case 500:     /* Syntax error, command unrecognized */
1446                 return "5.5.2";
1447
1448           case 501:     /* Syntax error in parameters or arguments */
1449                 return "5.5.4";
1450
1451           case 502:     /* Command not implemented */
1452                 return "5.5.1";
1453
1454           case 503:     /* Bad sequence of commands */
1455                 return "5.5.1";
1456
1457           case 504:     /* Command parameter not implemented */
1458                 return "5.5.4";
1459
1460           case 550:     /* Req mail action not taken: mailbox unavailable */
1461                 return "5.2.0";
1462
1463           case 551:     /* User not local; please try <...> */
1464                 return "5.1.6";
1465
1466           case 552:     /* Req mail action aborted: exceeded storage alloc */
1467                 return "5.2.2";
1468
1469           case 553:     /* Req action not taken: mailbox name not allowed */
1470                 return "5.1.0";
1471
1472           case 554:     /* Transaction failed */
1473                 return "5.0.0";
1474         }
1475
1476         if (REPLYTYPE(smtpstat) == 2)
1477                 return "2.0.0";
1478         if (REPLYTYPE(smtpstat) == 4)
1479                 return "4.0.0";
1480         return "5.0.0";
1481 }
1482 /*
1483 **  XTEXTIFY -- take regular text and turn it into DSN-style xtext
1484 **
1485 **      Parameters:
1486 **              t -- the text to convert.
1487 **              taboo -- additional characters that must be encoded.
1488 **
1489 **      Returns:
1490 **              The xtext-ified version of the same string.
1491 */
1492
1493 char *
1494 xtextify(t, taboo)
1495         register char *t;
1496         char *taboo;
1497 {
1498         register char *p;
1499         int l;
1500         int nbogus;
1501         static char *bp = NULL;
1502         static int bplen = 0;
1503
1504         if (taboo == NULL)
1505                 taboo = "";
1506
1507         /* figure out how long this xtext will have to be */
1508         nbogus = l = 0;
1509         for (p = t; *p != '\0'; p++)
1510         {
1511                 register int c = (*p & 0xff);
1512
1513                 /* ASCII dependence here -- this is the way the spec words it */
1514                 if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1515                     strchr(taboo, c) != NULL)
1516                         nbogus++;
1517                 l++;
1518         }
1519         if (nbogus < 0)
1520         {
1521                 /* since nbogus is ssize_t and wrapped, 2 * size_t would wrap */
1522                 syserr("!xtextify string too long");
1523         }
1524         if (nbogus == 0)
1525                 return t;
1526         l += nbogus * 2 + 1;
1527
1528         /* now allocate space if necessary for the new string */
1529         if (l > bplen)
1530         {
1531                 if (bp != NULL)
1532                         sm_free(bp); /* XXX */
1533                 bp = sm_pmalloc_x(l);
1534                 bplen = l;
1535         }
1536
1537         /* ok, copy the text with byte expansion */
1538         for (p = bp; *t != '\0'; )
1539         {
1540                 register int c = (*t++ & 0xff);
1541
1542                 /* ASCII dependence here -- this is the way the spec words it */
1543                 if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1544                     strchr(taboo, c) != NULL)
1545                 {
1546                         *p++ = '+';
1547                         *p++ = "0123456789ABCDEF"[c >> 4];
1548                         *p++ = "0123456789ABCDEF"[c & 0xf];
1549                 }
1550                 else
1551                         *p++ = c;
1552         }
1553         *p = '\0';
1554         return bp;
1555 }
1556 /*
1557 **  XUNTEXTIFY -- take xtext and turn it into plain text
1558 **
1559 **      Parameters:
1560 **              t -- the xtextified text.
1561 **
1562 **      Returns:
1563 **              The decoded text.  No attempt is made to deal with
1564 **              null strings in the resulting text.
1565 */
1566
1567 char *
1568 xuntextify(t)
1569         register char *t;
1570 {
1571         register char *p;
1572         int l;
1573         static char *bp = NULL;
1574         static int bplen = 0;
1575
1576         /* heuristic -- if no plus sign, just return the input */
1577         if (strchr(t, '+') == NULL)
1578                 return t;
1579
1580         /* xtext is always longer than decoded text */
1581         l = strlen(t);
1582         if (l > bplen)
1583         {
1584                 if (bp != NULL)
1585                         sm_free(bp); /* XXX */
1586                 bp = xalloc(l);
1587                 bplen = l;
1588         }
1589
1590         /* ok, copy the text with byte compression */
1591         for (p = bp; *t != '\0'; t++)
1592         {
1593                 register int c = *t & 0xff;
1594
1595                 if (c != '+')
1596                 {
1597                         *p++ = c;
1598                         continue;
1599                 }
1600
1601                 c = *++t & 0xff;
1602                 if (!isascii(c) || !isxdigit(c))
1603                 {
1604                         /* error -- first digit is not hex */
1605                         usrerr("bogus xtext: +%c", c);
1606                         t--;
1607                         continue;
1608                 }
1609                 if (isdigit(c))
1610                         c -= '0';
1611                 else if (isupper(c))
1612                         c -= 'A' - 10;
1613                 else
1614                         c -= 'a' - 10;
1615                 *p = c << 4;
1616
1617                 c = *++t & 0xff;
1618                 if (!isascii(c) || !isxdigit(c))
1619                 {
1620                         /* error -- second digit is not hex */
1621                         usrerr("bogus xtext: +%x%c", *p >> 4, c);
1622                         t--;
1623                         continue;
1624                 }
1625                 if (isdigit(c))
1626                         c -= '0';
1627                 else if (isupper(c))
1628                         c -= 'A' - 10;
1629                 else
1630                         c -= 'a' - 10;
1631                 *p++ |= c;
1632         }
1633         *p = '\0';
1634         return bp;
1635 }
1636 /*
1637 **  XTEXTOK -- check if a string is legal xtext
1638 **
1639 **      Xtext is used in Delivery Status Notifications.  The spec was
1640 **      taken from RFC 1891, ``SMTP Service Extension for Delivery
1641 **      Status Notifications''.
1642 **
1643 **      Parameters:
1644 **              s -- the string to check.
1645 **
1646 **      Returns:
1647 **              true -- if 's' is legal xtext.
1648 **              false -- if it has any illegal characters in it.
1649 */
1650
1651 bool
1652 xtextok(s)
1653         char *s;
1654 {
1655         int c;
1656
1657         while ((c = *s++) != '\0')
1658         {
1659                 if (c == '+')
1660                 {
1661                         c = *s++;
1662                         if (!isascii(c) || !isxdigit(c))
1663                                 return false;
1664                         c = *s++;
1665                         if (!isascii(c) || !isxdigit(c))
1666                                 return false;
1667                 }
1668                 else if (c < '!' || c > '~' || c == '=')
1669                         return false;
1670         }
1671         return true;
1672 }
1673 /*
1674 **  PRUNEROUTE -- prune an RFC-822 source route
1675 **
1676 **      Trims down a source route to the last internet-registered hop.
1677 **      This is encouraged by RFC 1123 section 5.3.3.
1678 **
1679 **      Parameters:
1680 **              addr -- the address
1681 **
1682 **      Returns:
1683 **              true -- address was modified
1684 **              false -- address could not be pruned
1685 **
1686 **      Side Effects:
1687 **              modifies addr in-place
1688 */
1689
1690 static bool
1691 pruneroute(addr)
1692         char *addr;
1693 {
1694 #if NAMED_BIND
1695         char *start, *at, *comma;
1696         char c;
1697         int braclev;
1698         int rcode;
1699         int i;
1700         char hostbuf[BUFSIZ];
1701         char *mxhosts[MAXMXHOSTS + 1];
1702
1703         /* check to see if this is really a route-addr */
1704         if (*addr != '<' || addr[1] != '@' || addr[strlen(addr) - 1] != '>')
1705                 return false;
1706
1707         /*
1708         **  Can't simply find the first ':' is the address might be in the
1709         **  form:  "<@[IPv6:::1]:user@host>" and the first ':' in inside
1710         **  the IPv6 address.
1711         */
1712
1713         start = addr;
1714         braclev = 0;
1715         while (*start != '\0')
1716         {
1717                 if (*start == ':' && braclev <= 0)
1718                         break;
1719                 else if (*start == '[')
1720                         braclev++;
1721                 else if (*start == ']' && braclev > 0)
1722                         braclev--;
1723                 start++;
1724         }
1725         if (braclev > 0 || *start != ':')
1726                 return false;
1727
1728         at = strrchr(addr, '@');
1729         if (at == NULL || at < start)
1730                 return false;
1731
1732         /* slice off the angle brackets */
1733         i = strlen(at + 1);
1734         if (i >= sizeof(hostbuf))
1735                 return false;
1736         (void) sm_strlcpy(hostbuf, at + 1, sizeof(hostbuf));
1737         hostbuf[i - 1] = '\0';
1738
1739         while (start != NULL)
1740         {
1741                 if (getmxrr(hostbuf, mxhosts, NULL, false,
1742                             &rcode, true, NULL) > 0)
1743                 {
1744                         (void) sm_strlcpy(addr + 1, start + 1,
1745                                           strlen(addr) - 1);
1746                         return true;
1747                 }
1748                 c = *start;
1749                 *start = '\0';
1750                 comma = strrchr(addr, ',');
1751                 if (comma != NULL && comma[1] == '@' &&
1752                     strlen(comma + 2) < sizeof(hostbuf))
1753                         (void) sm_strlcpy(hostbuf, comma + 2, sizeof(hostbuf));
1754                 else
1755                         comma = NULL;
1756                 *start = c;
1757                 start = comma;
1758         }
1759 #endif /* NAMED_BIND */
1760         return false;
1761 }