contrib/sendmail/src/savemail.c

   1 /*
   2  * Copyright (c) 1998-2003, 2006, 2012, 2013 Proofpoint, 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 8.319 2013-11-22 20:51:56 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)) >= 0 &&
 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         int ret;
 510         register ENVELOPE *ee;
 511         ENVELOPE *oldcur = CurEnv;
 512         ENVELOPE errenvelope;
 513         static int returndepth = 0;
 514         register ADDRESS *q;
 515         char *p;
 516         char buf[MAXNAME + 1];
 517
 518         if (returnq == NULL)
 519                 return -1;
 520
 521         if (msg == NULL)
 522                 msg = "Unable to deliver mail";
 523
 524         if (tTd(6, 1))
 525         {
 526                 sm_dprintf("\n*** Return To Sender: msg=\"%s\", depth=%d, e=%p, returnq=",
 527                         msg, returndepth, e);
 528                 printaddr(sm_debug_file(), returnq, true);
 529                 if (tTd(6, 20))
 530                 {
 531                         sm_dprintf("Sendq=");
 532                         printaddr(sm_debug_file(), e->e_sendqueue, true);
 533                 }
 534         }
 535
 536         if (++returndepth >= MAXRETURNS)
 537         {
 538                 if (returndepth != MAXRETURNS)
 539                         syserr("554 5.3.0 returntosender: infinite recursion on %s",
 540                                returnq->q_paddr);
 541                 /* don't "unrecurse" and fake a clean exit */
 542                 /* returndepth--; */
 543                 return 0;
 544         }
 545
 546         macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
 547         macdefine(&e->e_macro, A_PERM, 'u', NULL);
 548
 549         /* initialize error envelope */
 550         ee = newenvelope(&errenvelope, e, sm_rpool_new_x(NULL));
 551         macdefine(&ee->e_macro, A_PERM, 'a', "\201b");
 552         macdefine(&ee->e_macro, A_PERM, 'r', "");
 553         macdefine(&ee->e_macro, A_PERM, 's', "localhost");
 554         macdefine(&ee->e_macro, A_PERM, '_', "localhost");
 555         clrsessenvelope(ee);
 556
 557         ee->e_puthdr = putheader;
 558         ee->e_putbody = errbody;
 559         ee->e_flags |= EF_RESPONSE|EF_METOO;
 560         if (!bitset(EF_OLDSTYLE, e->e_flags))
 561                 ee->e_flags &= ~EF_OLDSTYLE;
 562         if (bitset(EF_DONT_MIME, e->e_flags))
 563         {
 564                 ee->e_flags |= EF_DONT_MIME;
 565
 566                 /*
 567                 **  If we can't convert to MIME and we don't pass
 568                 **  8-bit, we can't send the body.
 569                 */
 570
 571                 if (bitset(EF_HAS8BIT, e->e_flags) &&
 572                     !bitset(MM_PASS8BIT, MimeMode))
 573                         flags &= ~RTSF_SEND_BODY;
 574         }
 575
 576         ee->e_sendqueue = returnq;
 577         ee->e_msgsize = 0;
 578         if (bitset(RTSF_SEND_BODY, flags) &&
 579             !bitset(PRIV_NOBODYRETN, PrivacyFlags))
 580                 ee->e_msgsize = ERRORFUDGE + e->e_msgsize;
 581         else
 582                 ee->e_flags |= EF_NO_BODY_RETN;
 583
 584 #if _FFR_BOUNCE_QUEUE
 585         if (BounceQueue != NOQGRP)
 586                 ee->e_qgrp = ee->e_dfqgrp = BounceQueue;
 587 #endif /* _FFR_BOUNCE_QUEUE */
 588         if (!setnewqueue(ee))
 589         {
 590                 syserr("554 5.3.0 returntosender: cannot select queue for %s",
 591                                returnq->q_paddr);
 592                 ExitStat = EX_UNAVAILABLE;
 593                 returndepth--;
 594                 return -1;
 595         }
 596         initsys(ee);
 597
 598 #if NAMED_BIND
 599         _res.retry = TimeOuts.res_retry[RES_TO_FIRST];
 600         _res.retrans = TimeOuts.res_retrans[RES_TO_FIRST];
 601 #endif /* NAMED_BIND */
 602         for (q = returnq; q != NULL; q = q->q_next)
 603         {
 604                 if (QS_IS_BADADDR(q->q_state))
 605                         continue;
 606
 607                 q->q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
 608                 q->q_flags |= QPINGONFAILURE;
 609
 610                 if (!QS_IS_DEAD(q->q_state))
 611                         ee->e_nrcpts++;
 612
 613                 if (q->q_alias == NULL)
 614                         addheader("To", q->q_paddr, 0, ee, true);
 615         }
 616
 617         if (LogLevel > 5)
 618         {
 619                 if (bitset(EF_RESPONSE, e->e_flags))
 620                         p = "return to sender";
 621                 else if (bitset(EF_WARNING, e->e_flags))
 622                         p = "sender notify";
 623                 else if (bitset(RTSF_PM_BOUNCE, flags))
 624                         p = "postmaster notify";
 625                 else
 626                         p = "DSN";
 627                 sm_syslog(LOG_INFO, e->e_id, "%s: %s: %s",
 628                           ee->e_id, p, shortenstring(msg, MAXSHORTSTR));
 629         }
 630
 631         if (SendMIMEErrors)
 632         {
 633                 addheader("MIME-Version", "1.0", 0, ee, true);
 634                 (void) sm_snprintf(buf, sizeof(buf), "%s.%ld/%.100s",
 635                                 ee->e_id, (long)curtime(), MyHostName);
 636                 ee->e_msgboundary = sm_rpool_strdup_x(ee->e_rpool, buf);
 637                 (void) sm_snprintf(buf, sizeof(buf),
 638 #if DSN
 639                                 "multipart/report; report-type=delivery-status;\n\tboundary=\"%s\"",
 640 #else /* DSN */
 641                                 "multipart/mixed; boundary=\"%s\"",
 642 #endif /* DSN */
 643                                 ee->e_msgboundary);
 644                 addheader("Content-Type", buf, 0, ee, true);
 645
 646                 p = hvalue("Content-Transfer-Encoding", e->e_header);
 647                 if (p != NULL && sm_strcasecmp(p, "binary") != 0)
 648                         p = NULL;
 649                 if (p == NULL && bitset(EF_HAS8BIT, e->e_flags))
 650                         p = "8bit";
 651                 if (p != NULL)
 652                         addheader("Content-Transfer-Encoding", p, 0, ee, true);
 653         }
 654         if (strncmp(msg, "Warning:", 8) == 0)
 655         {
 656                 addheader("Subject", msg, 0, ee, true);
 657                 p = "warning-timeout";
 658         }
 659         else if (strncmp(msg, "Postmaster warning:", 19) == 0)
 660         {
 661                 addheader("Subject", msg, 0, ee, true);
 662                 p = "postmaster-warning";
 663         }
 664         else if (strcmp(msg, "Return receipt") == 0)
 665         {
 666                 addheader("Subject", msg, 0, ee, true);
 667                 p = "return-receipt";
 668         }
 669         else if (bitset(RTSF_PM_BOUNCE, flags))
 670         {
 671                 (void) sm_snprintf(buf, sizeof(buf),
 672                          "Postmaster notify: see transcript for details");
 673                 addheader("Subject", buf, 0, ee, true);
 674                 p = "postmaster-notification";
 675         }
 676         else
 677         {
 678                 (void) sm_snprintf(buf, sizeof(buf),
 679                          "Returned mail: see transcript for details");
 680                 addheader("Subject", buf, 0, ee, true);
 681                 p = "failure";
 682         }
 683         (void) sm_snprintf(buf, sizeof(buf), "auto-generated (%s)", p);
 684         addheader("Auto-Submitted", buf, 0, ee, true);
 685
 686         /* fake up an address header for the from person */
 687         expand("\201n", buf, sizeof(buf), e);
 688         if (parseaddr(buf, &ee->e_from,
 689                       RF_COPYALL|RF_SENDERADDR, '\0', NULL, e, false) == NULL)
 690         {
 691                 syserr("553 5.3.5 Can't parse myself!");
 692                 ExitStat = EX_SOFTWARE;
 693                 returndepth--;
 694                 return -1;
 695         }
 696         ee->e_from.q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
 697         ee->e_from.q_flags |= QPINGONFAILURE;
 698         ee->e_sender = ee->e_from.q_paddr;
 699
 700         /* push state into submessage */
 701         CurEnv = ee;
 702         macdefine(&ee->e_macro, A_PERM, 'f', "\201n");
 703         macdefine(&ee->e_macro, A_PERM, 'x', "Mail Delivery Subsystem");
 704         eatheader(ee, true, true);
 705
 706         /* mark statistics */
 707         markstats(ee, NULLADDR, STATS_NORMAL);
 708
 709 #if _FFR_BOUNCE_QUEUE
 710         if (BounceQueue == NOQGRP)
 711         {
 712 #endif
 713                 /* actually deliver the error message */
 714                 sendall(ee, SM_DELIVER);
 715 #if _FFR_BOUNCE_QUEUE
 716         }
 717 #endif
 718         (void) dropenvelope(ee, true, false);
 719
 720         /* check for delivery errors */
 721         ret = -1;
 722         if (ee->e_parent == NULL ||
 723             !bitset(EF_RESPONSE, ee->e_parent->e_flags))
 724         {
 725                 ret = 0;
 726         }
 727         else
 728         {
 729                 for (q = ee->e_sendqueue; q != NULL; q = q->q_next)
 730                 {
 731                         if (QS_IS_ATTEMPTED(q->q_state))
 732                         {
 733                                 ret = 0;
 734                                 break;
 735                         }
 736                 }
 737         }
 738
 739         /* restore state */
 740         sm_rpool_free(ee->e_rpool);
 741         CurEnv = oldcur;
 742         returndepth--;
 743
 744         return ret;
 745 }
 746
 747 /*
 748 **  ERRBODY -- output the body of an error message.
 749 **
 750 **      Typically this is a copy of the transcript plus a copy of the
 751 **      original offending message.
 752 **
 753 **      Parameters:
 754 **              mci -- the mailer connection information.
 755 **              e -- the envelope we are working in.
 756 **              separator -- any possible MIME separator (unused).
 757 **
 758 **      Returns:
 759 **              true iff body was written successfully
 760 **
 761 **      Side Effects:
 762 **              Outputs the body of an error message.
 763 */
 764
 765 /* ARGSUSED2 */
 766 static bool
 767 errbody(mci, e, separator)
 768         register MCI *mci;
 769         register ENVELOPE *e;
 770         char *separator;
 771 {
 772         bool printheader;
 773         bool sendbody;
 774         bool pm_notify;
 775         int save_errno;
 776         register SM_FILE_T *xfile;
 777         char *p;
 778         register ADDRESS *q = NULL;
 779         char actual[MAXLINE];
 780         char buf[MAXLINE];
 781
 782         if (bitset(MCIF_INHEADER, mci->mci_flags))
 783         {
 784                 if (!putline("", mci))
 785                         goto writeerr;
 786                 mci->mci_flags &= ~MCIF_INHEADER;
 787         }
 788         if (e->e_parent == NULL)
 789         {
 790                 syserr("errbody: null parent");
 791                 if (!putline("   ----- Original message lost -----\n", mci))
 792                         goto writeerr;
 793                 return true;
 794         }
 795
 796         /*
 797         **  Output MIME header.
 798         */
 799
 800         if (e->e_msgboundary != NULL)
 801         {
 802                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
 803                 if (!putline("This is a MIME-encapsulated message", mci) ||
 804                     !putline("", mci) ||
 805                     !putline(buf, mci) ||
 806                     !putline("", mci))
 807                         goto writeerr;
 808         }
 809
 810         /*
 811         **  Output introductory information.
 812         */
 813
 814         pm_notify = false;
 815         p = hvalue("subject", e->e_header);
 816         if (p != NULL && strncmp(p, "Postmaster ", 11) == 0)
 817                 pm_notify = true;
 818         else
 819         {
 820                 for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 821                 {
 822                         if (QS_IS_BADADDR(q->q_state))
 823                                 break;
 824                 }
 825         }
 826         if (!pm_notify && q == NULL &&
 827             !bitset(EF_FATALERRS|EF_SENDRECEIPT, e->e_parent->e_flags))
 828         {
 829                 if (!putline("    **********************************************",
 830                         mci) ||
 831                     !putline("    **      THIS IS A WARNING MESSAGE ONLY      **",
 832                         mci) ||
 833                     !putline("    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **",
 834                         mci) ||
 835                     !putline("    **********************************************",
 836                         mci) ||
 837                     !putline("", mci))
 838                         goto writeerr;
 839         }
 840         (void) sm_snprintf(buf, sizeof(buf),
 841                 "The original message was received at %s",
 842                 arpadate(ctime(&e->e_parent->e_ctime)));
 843         if (!putline(buf, mci))
 844                 goto writeerr;
 845         expand("from \201_", buf, sizeof(buf), e->e_parent);
 846         if (!putline(buf, mci))
 847                 goto writeerr;
 848
 849         /* include id in postmaster copies */
 850         if (pm_notify && e->e_parent->e_id != NULL)
 851         {
 852                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "with id ",
 853                         e->e_parent->e_id);
 854                 if (!putline(buf, mci))
 855                         goto writeerr;
 856         }
 857         if (!putline("", mci))
 858                 goto writeerr;
 859
 860         /*
 861         **  Output error message header (if specified and available).
 862         */
 863
 864         if (ErrMsgFile != NULL &&
 865             !bitset(EF_SENDRECEIPT, e->e_parent->e_flags))
 866         {
 867                 if (*ErrMsgFile == '/')
 868                 {
 869                         long sff = SFF_ROOTOK|SFF_REGONLY;
 870
 871                         if (DontLockReadFiles)
 872                                 sff |= SFF_NOLOCK;
 873                         if (!bitnset(DBS_ERRORHEADERINUNSAFEDIRPATH,
 874                                      DontBlameSendmail))
 875                                 sff |= SFF_SAFEDIRPATH;
 876                         xfile = safefopen(ErrMsgFile, O_RDONLY, 0444, sff);
 877                         if (xfile != NULL)
 878                         {
 879                                 while (sm_io_fgets(xfile, SM_TIME_DEFAULT, buf,
 880                                                    sizeof(buf)) >= 0)
 881                                 {
 882                                         int lbs;
 883                                         bool putok;
 884                                         char *lbp;
 885
 886                                         lbs = sizeof(buf);
 887                                         lbp = translate_dollars(buf, buf, &lbs);
 888                                         expand(lbp, lbp, lbs, e);
 889                                         putok = putline(lbp, mci);
 890                                         if (lbp != buf)
 891                                                 sm_free(lbp);
 892                                         if (!putok)
 893                                                 goto writeerr;
 894                                 }
 895                                 (void) sm_io_close(xfile, SM_TIME_DEFAULT);
 896                                 if (!putline("\n", mci))
 897                                         goto writeerr;
 898                         }
 899                 }
 900                 else
 901                 {
 902                         expand(ErrMsgFile, buf, sizeof(buf), e);
 903                         if (!putline(buf, mci) || !putline("", mci))
 904                                 goto writeerr;
 905                 }
 906         }
 907
 908         /*
 909         **  Output message introduction
 910         */
 911
 912         /* permanent fatal errors */
 913         printheader = true;
 914         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 915         {
 916                 if (!QS_IS_BADADDR(q->q_state) ||
 917                     !bitset(QPINGONFAILURE, q->q_flags))
 918                         continue;
 919
 920                 if (printheader)
 921                 {
 922                         if (!putline("   ----- The following addresses had permanent fatal errors -----",
 923                                         mci))
 924                                 goto writeerr;
 925                         printheader = false;
 926                 }
 927
 928                 (void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
 929                                   sizeof(buf));
 930                 if (!putline(buf, mci))
 931                         goto writeerr;
 932                 if (q->q_rstatus != NULL)
 933                 {
 934                         (void) sm_snprintf(buf, sizeof(buf),
 935                                 "    (reason: %s)",
 936                                 shortenstring(exitstat(q->q_rstatus),
 937                                               MAXSHORTSTR));
 938                         if (!putline(buf, mci))
 939                                 goto writeerr;
 940                 }
 941                 if (q->q_alias != NULL)
 942                 {
 943                         (void) sm_snprintf(buf, sizeof(buf),
 944                                 "    (expanded from: %s)",
 945                                 shortenstring(q->q_alias->q_paddr,
 946                                               MAXSHORTSTR));
 947                         if (!putline(buf, mci))
 948                                 goto writeerr;
 949                 }
 950         }
 951         if (!printheader && !putline("", mci))
 952                 goto writeerr;
 953
 954         /* transient non-fatal errors */
 955         printheader = true;
 956         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 957         {
 958                 if (QS_IS_BADADDR(q->q_state) ||
 959                     !bitset(QPRIMARY, q->q_flags) ||
 960                     !bitset(QBYNDELAY, q->q_flags) ||
 961                     !bitset(QDELAYED, q->q_flags))
 962                         continue;
 963
 964                 if (printheader)
 965                 {
 966                         if (!putline("   ----- The following addresses had transient non-fatal errors -----",
 967                                         mci))
 968                                 goto writeerr;
 969                         printheader = false;
 970                 }
 971
 972                 (void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
 973                                   sizeof(buf));
 974                 if (!putline(buf, mci))
 975                         goto writeerr;
 976                 if (q->q_alias != NULL)
 977                 {
 978                         (void) sm_snprintf(buf, sizeof(buf),
 979                                 "    (expanded from: %s)",
 980                                 shortenstring(q->q_alias->q_paddr,
 981                                               MAXSHORTSTR));
 982                         if (!putline(buf, mci))
 983                                 goto writeerr;
 984                 }
 985         }
 986         if (!printheader && !putline("", mci))
 987                 goto writeerr;
 988
 989         /* successful delivery notifications */
 990         printheader = true;
 991         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 992         {
 993                 if (QS_IS_BADADDR(q->q_state) ||
 994                     !bitset(QPRIMARY, q->q_flags) ||
 995                     bitset(QBYNDELAY, q->q_flags) ||
 996                     bitset(QDELAYED, q->q_flags))
 997                         continue;
 998                 else if (bitset(QBYNRELAY, q->q_flags))
 999                         p = "Deliver-By notify: relayed";
1000                 else if (bitset(QBYTRACE, q->q_flags))
1001                         p = "Deliver-By trace: relayed";
1002                 else if (!bitset(QPINGONSUCCESS, q->q_flags))
1003                         continue;
1004                 else if (bitset(QRELAYED, q->q_flags))
1005                         p = "relayed to non-DSN-aware mailer";
1006                 else if (bitset(QDELIVERED, q->q_flags))
1007                 {
1008                         if (bitset(QEXPANDED, q->q_flags))
1009                                 p = "successfully delivered to mailing list";
1010                         else
1011                                 p = "successfully delivered to mailbox";
1012                 }
1013                 else if (bitset(QEXPANDED, q->q_flags))
1014                         p = "expanded by alias";
1015                 else
1016                         continue;
1017
1018                 if (printheader)
1019                 {
1020                         if (!putline("   ----- The following addresses had successful delivery notifications -----",
1021                                         mci))
1022                                 goto writeerr;
1023                         printheader = false;
1024                 }
1025
1026                 (void) sm_snprintf(buf, sizeof(buf), "%s  (%s)",
1027                          shortenstring(q->q_paddr, MAXSHORTSTR), p);
1028                 if (!putline(buf, mci))
1029                         goto writeerr;
1030                 if (q->q_alias != NULL)
1031                 {
1032                         (void) sm_snprintf(buf, sizeof(buf),
1033                                 "    (expanded from: %s)",
1034                                 shortenstring(q->q_alias->q_paddr,
1035                                               MAXSHORTSTR));
1036                         if (!putline(buf, mci))
1037                                 goto writeerr;
1038                 }
1039         }
1040         if (!printheader && !putline("", mci))
1041                 goto writeerr;
1042
1043         /*
1044         **  Output transcript of errors
1045         */
1046
1047         (void) sm_io_flush(smioout, SM_TIME_DEFAULT);
1048         if (e->e_parent->e_xfp == NULL)
1049         {
1050                 if (!putline("   ----- Transcript of session is unavailable -----\n",
1051                                 mci))
1052                         goto writeerr;
1053         }
1054         else
1055         {
1056                 int blen;
1057
1058                 printheader = true;
1059                 (void) bfrewind(e->e_parent->e_xfp);
1060                 if (e->e_xfp != NULL)
1061                         (void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
1062                 while ((blen = sm_io_fgets(e->e_parent->e_xfp, SM_TIME_DEFAULT,
1063                                         buf, sizeof(buf))) >= 0)
1064                 {
1065                         if (printheader && !putline("   ----- Transcript of session follows -----\n",
1066                                                 mci))
1067                                 goto writeerr;
1068                         printheader = false;
1069                         if (!putxline(buf, blen, mci, PXLF_MAPFROM))
1070                                 goto writeerr;
1071                 }
1072         }
1073         errno = 0;
1074
1075 #if DSN
1076         /*
1077         **  Output machine-readable version.
1078         */
1079
1080         if (e->e_msgboundary != NULL)
1081         {
1082                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
1083                 if (!putline("", mci) ||
1084                     !putline(buf, mci) ||
1085                     !putline("Content-Type: message/delivery-status", mci) ||
1086                     !putline("", mci))
1087                         goto writeerr;
1088
1089                 /*
1090                 **  Output per-message information.
1091                 */
1092
1093                 /* original envelope id from MAIL FROM: line */
1094                 if (e->e_parent->e_envid != NULL)
1095                 {
1096                         (void) sm_snprintf(buf, sizeof(buf),
1097                                         "Original-Envelope-Id: %.800s",
1098                                         xuntextify(e->e_parent->e_envid));
1099                         if (!putline(buf, mci))
1100                                 goto writeerr;
1101                 }
1102
1103                 /* Reporting-MTA: is us (required) */
1104                 (void) sm_snprintf(buf, sizeof(buf),
1105                                    "Reporting-MTA: dns; %.800s", MyHostName);
1106                 if (!putline(buf, mci))
1107                         goto writeerr;
1108
1109                 /* DSN-Gateway: not relevant since we are not translating */
1110
1111                 /* Received-From-MTA: shows where we got this message from */
1112                 if (RealHostName != NULL)
1113                 {
1114                         /* XXX use $s for type? */
1115                         if (e->e_parent->e_from.q_mailer == NULL ||
1116                             (p = e->e_parent->e_from.q_mailer->m_mtatype) == NULL)
1117                                 p = "dns";
1118                         (void) sm_snprintf(buf, sizeof(buf),
1119                                         "Received-From-MTA: %s; %.800s",
1120                                         p, RealHostName);
1121                         if (!putline(buf, mci))
1122                                 goto writeerr;
1123                 }
1124
1125                 /* Arrival-Date: -- when it arrived here */
1126                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "Arrival-Date: ",
1127                                 arpadate(ctime(&e->e_parent->e_ctime)));
1128                 if (!putline(buf, mci))
1129                         goto writeerr;
1130
1131                 /* Deliver-By-Date: -- when it should have been delivered */
1132                 if (IS_DLVR_BY(e->e_parent))
1133                 {
1134                         time_t dbyd;
1135
1136                         dbyd = e->e_parent->e_ctime + e->e_parent->e_deliver_by;
1137                         (void) sm_strlcpyn(buf, sizeof(buf), 2,
1138                                         "Deliver-By-Date: ",
1139                                         arpadate(ctime(&dbyd)));
1140                         if (!putline(buf, mci))
1141                                 goto writeerr;
1142                 }
1143
1144                 /*
1145                 **  Output per-address information.
1146                 */
1147
1148                 for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
1149                 {
1150                         char *action;
1151
1152                         if (QS_IS_BADADDR(q->q_state))
1153                         {
1154                                 /* RFC 1891, 6.2.6 (b) */
1155                                 if (bitset(QHASNOTIFY, q->q_flags) &&
1156                                     !bitset(QPINGONFAILURE, q->q_flags))
1157                                         continue;
1158                                 action = "failed";
1159                         }
1160                         else if (!bitset(QPRIMARY, q->q_flags))
1161                                 continue;
1162                         else if (bitset(QDELIVERED, q->q_flags))
1163                         {
1164                                 if (bitset(QEXPANDED, q->q_flags))
1165                                         action = "delivered (to mailing list)";
1166                                 else
1167                                         action = "delivered (to mailbox)";
1168                         }
1169                         else if (bitset(QRELAYED, q->q_flags))
1170                                 action = "relayed (to non-DSN-aware mailer)";
1171                         else if (bitset(QEXPANDED, q->q_flags))
1172                                 action = "expanded (to multi-recipient alias)";
1173                         else if (bitset(QDELAYED, q->q_flags))
1174                                 action = "delayed";
1175                         else if (bitset(QBYTRACE, q->q_flags))
1176                                 action = "relayed (Deliver-By trace mode)";
1177                         else if (bitset(QBYNDELAY, q->q_flags))
1178                                 action = "delayed (Deliver-By notify mode)";
1179                         else if (bitset(QBYNRELAY, q->q_flags))
1180                                 action = "relayed (Deliver-By notify mode)";
1181                         else
1182                                 continue;
1183
1184                         if (!putline("", mci))
1185                                 goto writeerr;
1186
1187                         /* Original-Recipient: -- passed from on high */
1188                         if (q->q_orcpt != NULL)
1189                         {
1190                                 p = strchr(q->q_orcpt, ';');
1191
1192                                 /*
1193                                 **  p == NULL shouldn't happen due to
1194                                 **  check in srvrsmtp.c
1195                                 **  we could log an error in this case.
1196                                 */
1197
1198                                 if (p != NULL)
1199                                 {
1200                                         *p = '\0';
1201                                         (void) sm_snprintf(buf, sizeof(buf),
1202                                                 "Original-Recipient: %.100s;%.700s",
1203                                                 q->q_orcpt, xuntextify(p + 1));
1204                                         *p = ';';
1205                                         if (!putline(buf, mci))
1206                                                 goto writeerr;
1207                                 }
1208                         }
1209
1210                         /* Figure out actual recipient */
1211                         actual[0] = '\0';
1212                         if (q->q_user[0] != '\0')
1213                         {
1214                                 if (q->q_mailer != NULL &&
1215                                     q->q_mailer->m_addrtype != NULL)
1216                                         p = q->q_mailer->m_addrtype;
1217                                 else
1218                                         p = "rfc822";
1219
1220                                 if (sm_strcasecmp(p, "rfc822") == 0 &&
1221                                     strchr(q->q_user, '@') == NULL)
1222                                 {
1223                                         (void) sm_snprintf(actual,
1224                                                            sizeof(actual),
1225                                                            "%s; %.700s@%.100s",
1226                                                            p, q->q_user,
1227                                                            MyHostName);
1228                                 }
1229                                 else
1230                                 {
1231                                         (void) sm_snprintf(actual,
1232                                                            sizeof(actual),
1233                                                            "%s; %.800s",
1234                                                            p, q->q_user);
1235                                 }
1236                         }
1237
1238                         /* Final-Recipient: -- the name from the RCPT command */
1239                         if (q->q_finalrcpt == NULL)
1240                         {
1241                                 /* should never happen */
1242                                 sm_syslog(LOG_ERR, e->e_id,
1243                                           "returntosender: q_finalrcpt is NULL");
1244
1245                                 /* try to fall back to the actual recipient */
1246                                 if (actual[0] != '\0')
1247                                         q->q_finalrcpt = sm_rpool_strdup_x(e->e_rpool,
1248                                                                            actual);
1249                         }
1250
1251                         if (q->q_finalrcpt != NULL)
1252                         {
1253                                 (void) sm_snprintf(buf, sizeof(buf),
1254                                                    "Final-Recipient: %s",
1255                                                    q->q_finalrcpt);
1256                                 if (!putline(buf, mci))
1257                                         goto writeerr;
1258                         }
1259
1260                         /* X-Actual-Recipient: -- the real problem address */
1261                         if (actual[0] != '\0' &&
1262                             q->q_finalrcpt != NULL &&
1263                             !bitset(PRIV_NOACTUALRECIPIENT, PrivacyFlags) &&
1264                             strcmp(actual, q->q_finalrcpt) != 0)
1265                         {
1266                                 (void) sm_snprintf(buf, sizeof(buf),
1267                                                    "X-Actual-Recipient: %s",
1268                                                    actual);
1269                                 if (!putline(buf, mci))
1270                                         goto writeerr;
1271                         }
1272
1273                         /* Action: -- what happened? */
1274                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Action: ",
1275                                 action);
1276                         if (!putline(buf, mci))
1277                                 goto writeerr;
1278
1279                         /* Status: -- what _really_ happened? */
1280                         if (q->q_status != NULL)
1281                                 p = q->q_status;
1282                         else if (QS_IS_BADADDR(q->q_state))
1283                                 p = "5.0.0";
1284                         else if (QS_IS_QUEUEUP(q->q_state))
1285                                 p = "4.0.0";
1286                         else
1287                                 p = "2.0.0";
1288                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Status: ", p);
1289                         if (!putline(buf, mci))
1290                                 goto writeerr;
1291
1292                         /* Remote-MTA: -- who was I talking to? */
1293                         if (q->q_statmta != NULL)
1294                         {
1295                                 if (q->q_mailer == NULL ||
1296                                     (p = q->q_mailer->m_mtatype) == NULL)
1297                                         p = "dns";
1298                                 (void) sm_snprintf(buf, sizeof(buf),
1299                                                 "Remote-MTA: %s; %.800s",
1300                                                 p, q->q_statmta);
1301                                 p = &buf[strlen(buf) - 1];
1302                                 if (*p == '.')
1303                                         *p = '\0';
1304                                 if (!putline(buf, mci))
1305                                         goto writeerr;
1306                         }
1307
1308                         /* Diagnostic-Code: -- actual result from other end */
1309                         if (q->q_rstatus != NULL)
1310                         {
1311                                 if (q->q_mailer == NULL ||
1312                                     (p = q->q_mailer->m_diagtype) == NULL)
1313                                         p = "smtp";
1314                                 (void) sm_snprintf(buf, sizeof(buf),
1315                                                 "Diagnostic-Code: %s; %.800s",
1316                                                 p, q->q_rstatus);
1317                                 if (!putline(buf, mci))
1318                                         goto writeerr;
1319                         }
1320
1321                         /* Last-Attempt-Date: -- fine granularity */
1322                         if (q->q_statdate == (time_t) 0L)
1323                                 q->q_statdate = curtime();
1324                         (void) sm_strlcpyn(buf, sizeof(buf), 2,
1325                                         "Last-Attempt-Date: ",
1326                                         arpadate(ctime(&q->q_statdate)));
1327                         if (!putline(buf, mci))
1328                                 goto writeerr;
1329
1330                         /* Will-Retry-Until: -- for delayed messages only */
1331                         if (QS_IS_QUEUEUP(q->q_state))
1332                         {
1333                                 time_t xdate;
1334
1335                                 xdate = e->e_parent->e_ctime +
1336                                         TimeOuts.to_q_return[e->e_parent->e_timeoutclass];
1337                                 (void) sm_strlcpyn(buf, sizeof(buf), 2,
1338                                          "Will-Retry-Until: ",
1339                                          arpadate(ctime(&xdate)));
1340                                 if (!putline(buf, mci))
1341                                         goto writeerr;
1342                         }
1343                 }
1344         }
1345 #endif /* DSN */
1346
1347         /*
1348         **  Output text of original message
1349         */
1350
1351         if (!putline("", mci))
1352                 goto writeerr;
1353         if (bitset(EF_HAS_DF, e->e_parent->e_flags))
1354         {
1355                 sendbody = !bitset(EF_NO_BODY_RETN, e->e_parent->e_flags) &&
1356                            !bitset(EF_NO_BODY_RETN, e->e_flags);
1357
1358                 if (e->e_msgboundary == NULL)
1359                 {
1360                         if (!putline(
1361                                 sendbody
1362                                 ? "   ----- Original message follows -----\n"
1363                                 : "   ----- Message header follows -----\n",
1364                                 mci))
1365                         {
1366                                 goto writeerr;
1367                         }
1368                 }
1369                 else
1370                 {
1371                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "--",
1372                                         e->e_msgboundary);
1373
1374                         if (!putline(buf, mci))
1375                                 goto writeerr;
1376                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Content-Type: ",
1377                                         sendbody ? "message/rfc822"
1378                                                  : "text/rfc822-headers");
1379                         if (!putline(buf, mci))
1380                                 goto writeerr;
1381
1382                         p = hvalue("Content-Transfer-Encoding",
1383                                    e->e_parent->e_header);
1384                         if (p != NULL && sm_strcasecmp(p, "binary") != 0)
1385                                 p = NULL;
1386                         if (p == NULL &&
1387                             bitset(EF_HAS8BIT, e->e_parent->e_flags))
1388                                 p = "8bit";
1389                         if (p != NULL)
1390                         {
1391                                 (void) sm_snprintf(buf, sizeof(buf),
1392                                                 "Content-Transfer-Encoding: %s",
1393                                                 p);
1394                                 if (!putline(buf, mci))
1395                                         goto writeerr;
1396                         }
1397                 }
1398                 if (!putline("", mci))
1399                         goto writeerr;
1400                 save_errno = errno;
1401                 if (!putheader(mci, e->e_parent->e_header, e->e_parent,
1402                                 M87F_OUTER))
1403                         goto writeerr;
1404                 errno = save_errno;
1405                 if (sendbody)
1406                 {
1407                         if (!putbody(mci, e->e_parent, e->e_msgboundary))
1408                                 goto writeerr;
1409                 }
1410                 else if (e->e_msgboundary == NULL)
1411                 {
1412                         if (!putline("", mci) ||
1413                             !putline("   ----- Message body suppressed -----",
1414                                         mci))
1415                         {
1416                                 goto writeerr;
1417                         }
1418                 }
1419         }
1420         else if (e->e_msgboundary == NULL)
1421         {
1422                 if (!putline("  ----- No message was collected -----\n", mci))
1423                         goto writeerr;
1424         }
1425
1426         if (e->e_msgboundary != NULL)
1427         {
1428                 (void) sm_strlcpyn(buf, sizeof(buf), 3, "--", e->e_msgboundary,
1429                                    "--");
1430                 if (!putline("", mci) || !putline(buf, mci))
1431                         goto writeerr;
1432         }
1433         if (!putline("", mci) ||
1434             sm_io_flush(mci->mci_out, SM_TIME_DEFAULT) == SM_IO_EOF)
1435                         goto writeerr;
1436
1437         /*
1438         **  Cleanup and exit
1439         */
1440
1441         if (errno != 0)
1442         {
1443   writeerr:
1444                 syserr("errbody: I/O error");
1445                 return false;
1446         }
1447         return true;
1448 }
1449
1450 /*
1451 **  SMTPTODSN -- convert SMTP to DSN status code
1452 **
1453 **      Parameters:
1454 **              smtpstat -- the smtp status code (e.g., 550).
1455 **
1456 **      Returns:
1457 **              The DSN version of the status code.
1458 **
1459 **      Storage Management:
1460 **              smtptodsn() returns a pointer to a character string literal,
1461 **              which will remain valid forever, and thus does not need to
1462 **              be copied.  Current code relies on this property.
1463 */
1464
1465 char *
1466 smtptodsn(smtpstat)
1467         int smtpstat;
1468 {
1469         if (smtpstat < 0)
1470                 return "4.4.2";
1471
1472         switch (smtpstat)
1473         {
1474           case 450:     /* Req mail action not taken: mailbox unavailable */
1475                 return "4.2.0";
1476
1477           case 451:     /* Req action aborted: local error in processing */
1478                 return "4.3.0";
1479
1480           case 452:     /* Req action not taken: insufficient sys storage */
1481                 return "4.3.1";
1482
1483           case 500:     /* Syntax error, command unrecognized */
1484                 return "5.5.2";
1485
1486           case 501:     /* Syntax error in parameters or arguments */
1487                 return "5.5.4";
1488
1489           case 502:     /* Command not implemented */
1490                 return "5.5.1";
1491
1492           case 503:     /* Bad sequence of commands */
1493                 return "5.5.1";
1494
1495           case 504:     /* Command parameter not implemented */
1496                 return "5.5.4";
1497
1498           case 550:     /* Req mail action not taken: mailbox unavailable */
1499                 return "5.2.0";
1500
1501           case 551:     /* User not local; please try <...> */
1502                 return "5.1.6";
1503
1504           case 552:     /* Req mail action aborted: exceeded storage alloc */
1505                 return "5.2.2";
1506
1507           case 553:     /* Req action not taken: mailbox name not allowed */
1508                 return "5.1.0";
1509
1510           case 554:     /* Transaction failed */
1511                 return "5.0.0";
1512         }
1513
1514         if (REPLYTYPE(smtpstat) == 2)
1515                 return "2.0.0";
1516         if (REPLYTYPE(smtpstat) == 4)
1517                 return "4.0.0";
1518         return "5.0.0";
1519 }
1520 /*
1521 **  XTEXTIFY -- take regular text and turn it into DSN-style xtext
1522 **
1523 **      Parameters:
1524 **              t -- the text to convert.
1525 **              taboo -- additional characters that must be encoded.
1526 **
1527 **      Returns:
1528 **              The xtext-ified version of the same string.
1529 */
1530
1531 char *
1532 xtextify(t, taboo)
1533         register char *t;
1534         char *taboo;
1535 {
1536         register char *p;
1537         int l;
1538         int nbogus;
1539         static char *bp = NULL;
1540         static int bplen = 0;
1541
1542         if (taboo == NULL)
1543                 taboo = "";
1544
1545         /* figure out how long this xtext will have to be */
1546         nbogus = l = 0;
1547         for (p = t; *p != '\0'; p++)
1548         {
1549                 register int c = (*p & 0xff);
1550
1551                 /* ASCII dependence here -- this is the way the spec words it */
1552                 if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1553                     strchr(taboo, c) != NULL)
1554                         nbogus++;
1555                 l++;
1556         }
1557         if (nbogus < 0)
1558         {
1559                 /* since nbogus is ssize_t and wrapped, 2 * size_t would wrap */
1560                 syserr("!xtextify string too long");
1561         }
1562         if (nbogus == 0)
1563                 return t;
1564         l += nbogus * 2 + 1;
1565
1566         /* now allocate space if necessary for the new string */
1567         if (l > bplen)
1568         {
1569                 if (bp != NULL)
1570                         sm_free(bp); /* XXX */
1571                 bp = sm_pmalloc_x(l);
1572                 bplen = l;
1573         }
1574
1575         /* ok, copy the text with byte expansion */
1576         for (p = bp; *t != '\0'; )
1577         {
1578                 register int c = (*t++ & 0xff);
1579
1580                 /* ASCII dependence here -- this is the way the spec words it */
1581                 if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1582                     strchr(taboo, c) != NULL)
1583                 {
1584                         *p++ = '+';
1585                         *p++ = "0123456789ABCDEF"[c >> 4];
1586                         *p++ = "0123456789ABCDEF"[c & 0xf];
1587                 }
1588                 else
1589                         *p++ = c;
1590         }
1591         *p = '\0';
1592         return bp;
1593 }
1594 /*
1595 **  XUNTEXTIFY -- take xtext and turn it into plain text
1596 **
1597 **      Parameters:
1598 **              t -- the xtextified text.
1599 **
1600 **      Returns:
1601 **              The decoded text.  No attempt is made to deal with
1602 **              null strings in the resulting text.
1603 */
1604
1605 char *
1606 xuntextify(t)
1607         register char *t;
1608 {
1609         register char *p;
1610         int l;
1611         static char *bp = NULL;
1612         static int bplen = 0;
1613
1614         /* heuristic -- if no plus sign, just return the input */
1615         if (strchr(t, '+') == NULL)
1616                 return t;
1617
1618         /* xtext is always longer than decoded text */
1619         l = strlen(t);
1620         if (l > bplen)
1621         {
1622                 if (bp != NULL)
1623                         sm_free(bp); /* XXX */
1624                 bp = xalloc(l);
1625                 bplen = l;
1626         }
1627
1628         /* ok, copy the text with byte compression */
1629         for (p = bp; *t != '\0'; t++)
1630         {
1631                 register int c = *t & 0xff;
1632
1633                 if (c != '+')
1634                 {
1635                         *p++ = c;
1636                         continue;
1637                 }
1638
1639                 c = *++t & 0xff;
1640                 if (!isascii(c) || !isxdigit(c))
1641                 {
1642                         /* error -- first digit is not hex */
1643                         usrerr("bogus xtext: +%c", c);
1644                         t--;
1645                         continue;
1646                 }
1647                 if (isdigit(c))
1648                         c -= '0';
1649                 else if (isupper(c))
1650                         c -= 'A' - 10;
1651                 else
1652                         c -= 'a' - 10;
1653                 *p = c << 4;
1654
1655                 c = *++t & 0xff;
1656                 if (!isascii(c) || !isxdigit(c))
1657                 {
1658                         /* error -- second digit is not hex */
1659                         usrerr("bogus xtext: +%x%c", *p >> 4, c);
1660                         t--;
1661                         continue;
1662                 }
1663                 if (isdigit(c))
1664                         c -= '0';
1665                 else if (isupper(c))
1666                         c -= 'A' - 10;
1667                 else
1668                         c -= 'a' - 10;
1669                 *p++ |= c;
1670         }
1671         *p = '\0';
1672         return bp;
1673 }
1674 /*
1675 **  XTEXTOK -- check if a string is legal xtext
1676 **
1677 **      Xtext is used in Delivery Status Notifications.  The spec was
1678 **      taken from RFC 1891, ``SMTP Service Extension for Delivery
1679 **      Status Notifications''.
1680 **
1681 **      Parameters:
1682 **              s -- the string to check.
1683 **
1684 **      Returns:
1685 **              true -- if 's' is legal xtext.
1686 **              false -- if it has any illegal characters in it.
1687 */
1688
1689 bool
1690 xtextok(s)
1691         char *s;
1692 {
1693         int c;
1694
1695         while ((c = *s++) != '\0')
1696         {
1697                 if (c == '+')
1698                 {
1699                         c = *s++;
1700                         if (!isascii(c) || !isxdigit(c))
1701                                 return false;
1702                         c = *s++;
1703                         if (!isascii(c) || !isxdigit(c))
1704                                 return false;
1705                 }
1706                 else if (c < '!' || c > '~' || c == '=')
1707                         return false;
1708         }
1709         return true;
1710 }
1711
1712 /*
1713 **  ISATOM -- check if a string is an "atom"
1714 **
1715 **      Parameters:
1716 **              s -- the string to check.
1717 **
1718 **      Returns:
1719 **              true -- iff s is an atom
1720 */
1721
1722 bool
1723 isatom(s)
1724         const char *s;
1725 {
1726         int c;
1727
1728         if (s == NULL || *s == '\0')
1729                 return false;
1730         while ((c = *s++) != '\0')
1731         {
1732                 if (strchr("()<>@,;:\\.[]\"", c) != NULL)
1733                         return false;
1734                 if (c < '!' || c > '~')
1735                         return false;
1736         }
1737         return true;
1738 }
1739 /*
1740 **  PRUNEROUTE -- prune an RFC-822 source route
1741 **
1742 **      Trims down a source route to the last internet-registered hop.
1743 **      This is encouraged by RFC 1123 section 5.3.3.
1744 **
1745 **      Parameters:
1746 **              addr -- the address
1747 **
1748 **      Returns:
1749 **              true -- address was modified
1750 **              false -- address could not be pruned
1751 **
1752 **      Side Effects:
1753 **              modifies addr in-place
1754 */
1755
1756 static bool
1757 pruneroute(addr)
1758         char *addr;
1759 {
1760 #if NAMED_BIND
1761         char *start, *at, *comma;
1762         char c;
1763         int braclev;
1764         int rcode;
1765         int i;
1766         char hostbuf[BUFSIZ];
1767         char *mxhosts[MAXMXHOSTS + 1];
1768
1769         /* check to see if this is really a route-addr */
1770         if (*addr != '<' || addr[1] != '@' || addr[strlen(addr) - 1] != '>')
1771                 return false;
1772
1773         /*
1774         **  Can't simply find the first ':' is the address might be in the
1775         **  form:  "<@[IPv6:::1]:user@host>" and the first ':' in inside
1776         **  the IPv6 address.
1777         */
1778
1779         start = addr;
1780         braclev = 0;
1781         while (*start != '\0')
1782         {
1783                 if (*start == ':' && braclev <= 0)
1784                         break;
1785                 else if (*start == '[')
1786                         braclev++;
1787                 else if (*start == ']' && braclev > 0)
1788                         braclev--;
1789                 start++;
1790         }
1791         if (braclev > 0 || *start != ':')
1792                 return false;
1793
1794         at = strrchr(addr, '@');
1795         if (at == NULL || at < start)
1796                 return false;
1797
1798         /* slice off the angle brackets */
1799         i = strlen(at + 1);
1800         if (i >= sizeof(hostbuf))
1801                 return false;
1802         (void) sm_strlcpy(hostbuf, at + 1, sizeof(hostbuf));
1803         hostbuf[i - 1] = '\0';
1804
1805         while (start != NULL)
1806         {
1807                 if (getmxrr(hostbuf, mxhosts, NULL, false,
1808                             &rcode, true, NULL) > 0)
1809                 {
1810                         (void) sm_strlcpy(addr + 1, start + 1,
1811                                           strlen(addr) - 1);
1812                         return true;
1813                 }
1814                 c = *start;
1815                 *start = '\0';
1816                 comma = strrchr(addr, ',');
1817                 if (comma != NULL && comma[1] == '@' &&
1818                     strlen(comma + 2) < sizeof(hostbuf))
1819                         (void) sm_strlcpy(hostbuf, comma + 2, sizeof(hostbuf));
1820                 else
1821                         comma = NULL;
1822                 *start = c;
1823                 start = comma;
1824         }
1825 #endif /* NAMED_BIND */
1826         return false;
1827 }