contrib/sendmail/src/savemail.c

   1 /*
   2  * Copyright (c) 1998-2003, 2006, 2012, 2013 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 8.318 2013/03/12 15:24:54 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 (!setnewqueue(ee))
 585         {
 586                 syserr("554 5.3.0 returntosender: cannot select queue for %s",
 587                                returnq->q_paddr);
 588                 ExitStat = EX_UNAVAILABLE;
 589                 returndepth--;
 590                 return -1;
 591         }
 592         initsys(ee);
 593
 594 #if NAMED_BIND
 595         _res.retry = TimeOuts.res_retry[RES_TO_FIRST];
 596         _res.retrans = TimeOuts.res_retrans[RES_TO_FIRST];
 597 #endif /* NAMED_BIND */
 598         for (q = returnq; q != NULL; q = q->q_next)
 599         {
 600                 if (QS_IS_BADADDR(q->q_state))
 601                         continue;
 602
 603                 q->q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
 604                 q->q_flags |= QPINGONFAILURE;
 605
 606                 if (!QS_IS_DEAD(q->q_state))
 607                         ee->e_nrcpts++;
 608
 609                 if (q->q_alias == NULL)
 610                         addheader("To", q->q_paddr, 0, ee, true);
 611         }
 612
 613         if (LogLevel > 5)
 614         {
 615                 if (bitset(EF_RESPONSE, e->e_flags))
 616                         p = "return to sender";
 617                 else if (bitset(EF_WARNING, e->e_flags))
 618                         p = "sender notify";
 619                 else if (bitset(RTSF_PM_BOUNCE, flags))
 620                         p = "postmaster notify";
 621                 else
 622                         p = "DSN";
 623                 sm_syslog(LOG_INFO, e->e_id, "%s: %s: %s",
 624                           ee->e_id, p, shortenstring(msg, MAXSHORTSTR));
 625         }
 626
 627         if (SendMIMEErrors)
 628         {
 629                 addheader("MIME-Version", "1.0", 0, ee, true);
 630                 (void) sm_snprintf(buf, sizeof(buf), "%s.%ld/%.100s",
 631                                 ee->e_id, (long)curtime(), MyHostName);
 632                 ee->e_msgboundary = sm_rpool_strdup_x(ee->e_rpool, buf);
 633                 (void) sm_snprintf(buf, sizeof(buf),
 634 #if DSN
 635                                 "multipart/report; report-type=delivery-status;\n\tboundary=\"%s\"",
 636 #else /* DSN */
 637                                 "multipart/mixed; boundary=\"%s\"",
 638 #endif /* DSN */
 639                                 ee->e_msgboundary);
 640                 addheader("Content-Type", buf, 0, ee, true);
 641
 642                 p = hvalue("Content-Transfer-Encoding", e->e_header);
 643                 if (p != NULL && sm_strcasecmp(p, "binary") != 0)
 644                         p = NULL;
 645                 if (p == NULL && bitset(EF_HAS8BIT, e->e_flags))
 646                         p = "8bit";
 647                 if (p != NULL)
 648                         addheader("Content-Transfer-Encoding", p, 0, ee, true);
 649         }
 650         if (strncmp(msg, "Warning:", 8) == 0)
 651         {
 652                 addheader("Subject", msg, 0, ee, true);
 653                 p = "warning-timeout";
 654         }
 655         else if (strncmp(msg, "Postmaster warning:", 19) == 0)
 656         {
 657                 addheader("Subject", msg, 0, ee, true);
 658                 p = "postmaster-warning";
 659         }
 660         else if (strcmp(msg, "Return receipt") == 0)
 661         {
 662                 addheader("Subject", msg, 0, ee, true);
 663                 p = "return-receipt";
 664         }
 665         else if (bitset(RTSF_PM_BOUNCE, flags))
 666         {
 667                 (void) sm_snprintf(buf, sizeof(buf),
 668                          "Postmaster notify: see transcript for details");
 669                 addheader("Subject", buf, 0, ee, true);
 670                 p = "postmaster-notification";
 671         }
 672         else
 673         {
 674                 (void) sm_snprintf(buf, sizeof(buf),
 675                          "Returned mail: see transcript for details");
 676                 addheader("Subject", buf, 0, ee, true);
 677                 p = "failure";
 678         }
 679         (void) sm_snprintf(buf, sizeof(buf), "auto-generated (%s)", p);
 680         addheader("Auto-Submitted", buf, 0, ee, true);
 681
 682         /* fake up an address header for the from person */
 683         expand("\201n", buf, sizeof(buf), e);
 684         if (parseaddr(buf, &ee->e_from,
 685                       RF_COPYALL|RF_SENDERADDR, '\0', NULL, e, false) == NULL)
 686         {
 687                 syserr("553 5.3.5 Can't parse myself!");
 688                 ExitStat = EX_SOFTWARE;
 689                 returndepth--;
 690                 return -1;
 691         }
 692         ee->e_from.q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
 693         ee->e_from.q_flags |= QPINGONFAILURE;
 694         ee->e_sender = ee->e_from.q_paddr;
 695
 696         /* push state into submessage */
 697         CurEnv = ee;
 698         macdefine(&ee->e_macro, A_PERM, 'f', "\201n");
 699         macdefine(&ee->e_macro, A_PERM, 'x', "Mail Delivery Subsystem");
 700         eatheader(ee, true, true);
 701
 702         /* mark statistics */
 703         markstats(ee, NULLADDR, STATS_NORMAL);
 704
 705         /* actually deliver the error message */
 706         sendall(ee, SM_DELIVER);
 707         (void) dropenvelope(ee, true, false);
 708
 709         /* check for delivery errors */
 710         ret = -1;
 711         if (ee->e_parent == NULL ||
 712             !bitset(EF_RESPONSE, ee->e_parent->e_flags))
 713         {
 714                 ret = 0;
 715         }
 716         else
 717         {
 718                 for (q = ee->e_sendqueue; q != NULL; q = q->q_next)
 719                 {
 720                         if (QS_IS_ATTEMPTED(q->q_state))
 721                         {
 722                                 ret = 0;
 723                                 break;
 724                         }
 725                 }
 726         }
 727
 728         /* restore state */
 729         sm_rpool_free(ee->e_rpool);
 730         CurEnv = oldcur;
 731         returndepth--;
 732
 733         return ret;
 734 }
 735
 736 /*
 737 **  ERRBODY -- output the body of an error message.
 738 **
 739 **      Typically this is a copy of the transcript plus a copy of the
 740 **      original offending message.
 741 **
 742 **      Parameters:
 743 **              mci -- the mailer connection information.
 744 **              e -- the envelope we are working in.
 745 **              separator -- any possible MIME separator (unused).
 746 **
 747 **      Returns:
 748 **              true iff body was written successfully
 749 **
 750 **      Side Effects:
 751 **              Outputs the body of an error message.
 752 */
 753
 754 /* ARGSUSED2 */
 755 static bool
 756 errbody(mci, e, separator)
 757         register MCI *mci;
 758         register ENVELOPE *e;
 759         char *separator;
 760 {
 761         bool printheader;
 762         bool sendbody;
 763         bool pm_notify;
 764         int save_errno;
 765         register SM_FILE_T *xfile;
 766         char *p;
 767         register ADDRESS *q = NULL;
 768         char actual[MAXLINE];
 769         char buf[MAXLINE];
 770
 771         if (bitset(MCIF_INHEADER, mci->mci_flags))
 772         {
 773                 if (!putline("", mci))
 774                         goto writeerr;
 775                 mci->mci_flags &= ~MCIF_INHEADER;
 776         }
 777         if (e->e_parent == NULL)
 778         {
 779                 syserr("errbody: null parent");
 780                 if (!putline("   ----- Original message lost -----\n", mci))
 781                         goto writeerr;
 782                 return true;
 783         }
 784
 785         /*
 786         **  Output MIME header.
 787         */
 788
 789         if (e->e_msgboundary != NULL)
 790         {
 791                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
 792                 if (!putline("This is a MIME-encapsulated message", mci) ||
 793                     !putline("", mci) ||
 794                     !putline(buf, mci) ||
 795                     !putline("", mci))
 796                         goto writeerr;
 797         }
 798
 799         /*
 800         **  Output introductory information.
 801         */
 802
 803         pm_notify = false;
 804         p = hvalue("subject", e->e_header);
 805         if (p != NULL && strncmp(p, "Postmaster ", 11) == 0)
 806                 pm_notify = true;
 807         else
 808         {
 809                 for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 810                 {
 811                         if (QS_IS_BADADDR(q->q_state))
 812                                 break;
 813                 }
 814         }
 815         if (!pm_notify && q == NULL &&
 816             !bitset(EF_FATALERRS|EF_SENDRECEIPT, e->e_parent->e_flags))
 817         {
 818                 if (!putline("    **********************************************",
 819                         mci) ||
 820                     !putline("    **      THIS IS A WARNING MESSAGE ONLY      **",
 821                         mci) ||
 822                     !putline("    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **",
 823                         mci) ||
 824                     !putline("    **********************************************",
 825                         mci) ||
 826                     !putline("", mci))
 827                         goto writeerr;
 828         }
 829         (void) sm_snprintf(buf, sizeof(buf),
 830                 "The original message was received at %s",
 831                 arpadate(ctime(&e->e_parent->e_ctime)));
 832         if (!putline(buf, mci))
 833                 goto writeerr;
 834         expand("from \201_", buf, sizeof(buf), e->e_parent);
 835         if (!putline(buf, mci))
 836                 goto writeerr;
 837
 838         /* include id in postmaster copies */
 839         if (pm_notify && e->e_parent->e_id != NULL)
 840         {
 841                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "with id ",
 842                         e->e_parent->e_id);
 843                 if (!putline(buf, mci))
 844                         goto writeerr;
 845         }
 846         if (!putline("", mci))
 847                 goto writeerr;
 848
 849         /*
 850         **  Output error message header (if specified and available).
 851         */
 852
 853         if (ErrMsgFile != NULL &&
 854             !bitset(EF_SENDRECEIPT, e->e_parent->e_flags))
 855         {
 856                 if (*ErrMsgFile == '/')
 857                 {
 858                         long sff = SFF_ROOTOK|SFF_REGONLY;
 859
 860                         if (DontLockReadFiles)
 861                                 sff |= SFF_NOLOCK;
 862                         if (!bitnset(DBS_ERRORHEADERINUNSAFEDIRPATH,
 863                                      DontBlameSendmail))
 864                                 sff |= SFF_SAFEDIRPATH;
 865                         xfile = safefopen(ErrMsgFile, O_RDONLY, 0444, sff);
 866                         if (xfile != NULL)
 867                         {
 868                                 while (sm_io_fgets(xfile, SM_TIME_DEFAULT, buf,
 869                                                    sizeof(buf)) >= 0)
 870                                 {
 871                                         int lbs;
 872                                         bool putok;
 873                                         char *lbp;
 874
 875                                         lbs = sizeof(buf);
 876                                         lbp = translate_dollars(buf, buf, &lbs);
 877                                         expand(lbp, lbp, lbs, e);
 878                                         putok = putline(lbp, mci);
 879                                         if (lbp != buf)
 880                                                 sm_free(lbp);
 881                                         if (!putok)
 882                                                 goto writeerr;
 883                                 }
 884                                 (void) sm_io_close(xfile, SM_TIME_DEFAULT);
 885                                 if (!putline("\n", mci))
 886                                         goto writeerr;
 887                         }
 888                 }
 889                 else
 890                 {
 891                         expand(ErrMsgFile, buf, sizeof(buf), e);
 892                         if (!putline(buf, mci) || !putline("", mci))
 893                                 goto writeerr;
 894                 }
 895         }
 896
 897         /*
 898         **  Output message introduction
 899         */
 900
 901         /* permanent fatal errors */
 902         printheader = true;
 903         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 904         {
 905                 if (!QS_IS_BADADDR(q->q_state) ||
 906                     !bitset(QPINGONFAILURE, q->q_flags))
 907                         continue;
 908
 909                 if (printheader)
 910                 {
 911                         if (!putline("   ----- The following addresses had permanent fatal errors -----",
 912                                         mci))
 913                                 goto writeerr;
 914                         printheader = false;
 915                 }
 916
 917                 (void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
 918                                   sizeof(buf));
 919                 if (!putline(buf, mci))
 920                         goto writeerr;
 921                 if (q->q_rstatus != NULL)
 922                 {
 923                         (void) sm_snprintf(buf, sizeof(buf),
 924                                 "    (reason: %s)",
 925                                 shortenstring(exitstat(q->q_rstatus),
 926                                               MAXSHORTSTR));
 927                         if (!putline(buf, mci))
 928                                 goto writeerr;
 929                 }
 930                 if (q->q_alias != NULL)
 931                 {
 932                         (void) sm_snprintf(buf, sizeof(buf),
 933                                 "    (expanded from: %s)",
 934                                 shortenstring(q->q_alias->q_paddr,
 935                                               MAXSHORTSTR));
 936                         if (!putline(buf, mci))
 937                                 goto writeerr;
 938                 }
 939         }
 940         if (!printheader && !putline("", mci))
 941                 goto writeerr;
 942
 943         /* transient non-fatal errors */
 944         printheader = true;
 945         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 946         {
 947                 if (QS_IS_BADADDR(q->q_state) ||
 948                     !bitset(QPRIMARY, q->q_flags) ||
 949                     !bitset(QBYNDELAY, q->q_flags) ||
 950                     !bitset(QDELAYED, q->q_flags))
 951                         continue;
 952
 953                 if (printheader)
 954                 {
 955                         if (!putline("   ----- The following addresses had transient non-fatal errors -----",
 956                                         mci))
 957                                 goto writeerr;
 958                         printheader = false;
 959                 }
 960
 961                 (void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
 962                                   sizeof(buf));
 963                 if (!putline(buf, mci))
 964                         goto writeerr;
 965                 if (q->q_alias != NULL)
 966                 {
 967                         (void) sm_snprintf(buf, sizeof(buf),
 968                                 "    (expanded from: %s)",
 969                                 shortenstring(q->q_alias->q_paddr,
 970                                               MAXSHORTSTR));
 971                         if (!putline(buf, mci))
 972                                 goto writeerr;
 973                 }
 974         }
 975         if (!printheader && !putline("", mci))
 976                 goto writeerr;
 977
 978         /* successful delivery notifications */
 979         printheader = true;
 980         for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
 981         {
 982                 if (QS_IS_BADADDR(q->q_state) ||
 983                     !bitset(QPRIMARY, q->q_flags) ||
 984                     bitset(QBYNDELAY, q->q_flags) ||
 985                     bitset(QDELAYED, q->q_flags))
 986                         continue;
 987                 else if (bitset(QBYNRELAY, q->q_flags))
 988                         p = "Deliver-By notify: relayed";
 989                 else if (bitset(QBYTRACE, q->q_flags))
 990                         p = "Deliver-By trace: relayed";
 991                 else if (!bitset(QPINGONSUCCESS, q->q_flags))
 992                         continue;
 993                 else if (bitset(QRELAYED, q->q_flags))
 994                         p = "relayed to non-DSN-aware mailer";
 995                 else if (bitset(QDELIVERED, q->q_flags))
 996                 {
 997                         if (bitset(QEXPANDED, q->q_flags))
 998                                 p = "successfully delivered to mailing list";
 999                         else
1000                                 p = "successfully delivered to mailbox";
1001                 }
1002                 else if (bitset(QEXPANDED, q->q_flags))
1003                         p = "expanded by alias";
1004                 else
1005                         continue;
1006
1007                 if (printheader)
1008                 {
1009                         if (!putline("   ----- The following addresses had successful delivery notifications -----",
1010                                         mci))
1011                                 goto writeerr;
1012                         printheader = false;
1013                 }
1014
1015                 (void) sm_snprintf(buf, sizeof(buf), "%s  (%s)",
1016                          shortenstring(q->q_paddr, MAXSHORTSTR), p);
1017                 if (!putline(buf, mci))
1018                         goto writeerr;
1019                 if (q->q_alias != NULL)
1020                 {
1021                         (void) sm_snprintf(buf, sizeof(buf),
1022                                 "    (expanded from: %s)",
1023                                 shortenstring(q->q_alias->q_paddr,
1024                                               MAXSHORTSTR));
1025                         if (!putline(buf, mci))
1026                                 goto writeerr;
1027                 }
1028         }
1029         if (!printheader && !putline("", mci))
1030                 goto writeerr;
1031
1032         /*
1033         **  Output transcript of errors
1034         */
1035
1036         (void) sm_io_flush(smioout, SM_TIME_DEFAULT);
1037         if (e->e_parent->e_xfp == NULL)
1038         {
1039                 if (!putline("   ----- Transcript of session is unavailable -----\n",
1040                                 mci))
1041                         goto writeerr;
1042         }
1043         else
1044         {
1045                 int blen;
1046
1047                 printheader = true;
1048                 (void) bfrewind(e->e_parent->e_xfp);
1049                 if (e->e_xfp != NULL)
1050                         (void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
1051                 while ((blen = sm_io_fgets(e->e_parent->e_xfp, SM_TIME_DEFAULT,
1052                                         buf, sizeof(buf))) >= 0)
1053                 {
1054                         if (printheader && !putline("   ----- Transcript of session follows -----\n",
1055                                                 mci))
1056                                 goto writeerr;
1057                         printheader = false;
1058                         if (!putxline(buf, blen, mci, PXLF_MAPFROM))
1059                                 goto writeerr;
1060                 }
1061         }
1062         errno = 0;
1063
1064 #if DSN
1065         /*
1066         **  Output machine-readable version.
1067         */
1068
1069         if (e->e_msgboundary != NULL)
1070         {
1071                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
1072                 if (!putline("", mci) ||
1073                     !putline(buf, mci) ||
1074                     !putline("Content-Type: message/delivery-status", mci) ||
1075                     !putline("", mci))
1076                         goto writeerr;
1077
1078                 /*
1079                 **  Output per-message information.
1080                 */
1081
1082                 /* original envelope id from MAIL FROM: line */
1083                 if (e->e_parent->e_envid != NULL)
1084                 {
1085                         (void) sm_snprintf(buf, sizeof(buf),
1086                                         "Original-Envelope-Id: %.800s",
1087                                         xuntextify(e->e_parent->e_envid));
1088                         if (!putline(buf, mci))
1089                                 goto writeerr;
1090                 }
1091
1092                 /* Reporting-MTA: is us (required) */
1093                 (void) sm_snprintf(buf, sizeof(buf),
1094                                    "Reporting-MTA: dns; %.800s", MyHostName);
1095                 if (!putline(buf, mci))
1096                         goto writeerr;
1097
1098                 /* DSN-Gateway: not relevant since we are not translating */
1099
1100                 /* Received-From-MTA: shows where we got this message from */
1101                 if (RealHostName != NULL)
1102                 {
1103                         /* XXX use $s for type? */
1104                         if (e->e_parent->e_from.q_mailer == NULL ||
1105                             (p = e->e_parent->e_from.q_mailer->m_mtatype) == NULL)
1106                                 p = "dns";
1107                         (void) sm_snprintf(buf, sizeof(buf),
1108                                         "Received-From-MTA: %s; %.800s",
1109                                         p, RealHostName);
1110                         if (!putline(buf, mci))
1111                                 goto writeerr;
1112                 }
1113
1114                 /* Arrival-Date: -- when it arrived here */
1115                 (void) sm_strlcpyn(buf, sizeof(buf), 2, "Arrival-Date: ",
1116                                 arpadate(ctime(&e->e_parent->e_ctime)));
1117                 if (!putline(buf, mci))
1118                         goto writeerr;
1119
1120                 /* Deliver-By-Date: -- when it should have been delivered */
1121                 if (IS_DLVR_BY(e->e_parent))
1122                 {
1123                         time_t dbyd;
1124
1125                         dbyd = e->e_parent->e_ctime + e->e_parent->e_deliver_by;
1126                         (void) sm_strlcpyn(buf, sizeof(buf), 2,
1127                                         "Deliver-By-Date: ",
1128                                         arpadate(ctime(&dbyd)));
1129                         if (!putline(buf, mci))
1130                                 goto writeerr;
1131                 }
1132
1133                 /*
1134                 **  Output per-address information.
1135                 */
1136
1137                 for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
1138                 {
1139                         char *action;
1140
1141                         if (QS_IS_BADADDR(q->q_state))
1142                         {
1143                                 /* RFC 1891, 6.2.6 (b) */
1144                                 if (bitset(QHASNOTIFY, q->q_flags) &&
1145                                     !bitset(QPINGONFAILURE, q->q_flags))
1146                                         continue;
1147                                 action = "failed";
1148                         }
1149                         else if (!bitset(QPRIMARY, q->q_flags))
1150                                 continue;
1151                         else if (bitset(QDELIVERED, q->q_flags))
1152                         {
1153                                 if (bitset(QEXPANDED, q->q_flags))
1154                                         action = "delivered (to mailing list)";
1155                                 else
1156                                         action = "delivered (to mailbox)";
1157                         }
1158                         else if (bitset(QRELAYED, q->q_flags))
1159                                 action = "relayed (to non-DSN-aware mailer)";
1160                         else if (bitset(QEXPANDED, q->q_flags))
1161                                 action = "expanded (to multi-recipient alias)";
1162                         else if (bitset(QDELAYED, q->q_flags))
1163                                 action = "delayed";
1164                         else if (bitset(QBYTRACE, q->q_flags))
1165                                 action = "relayed (Deliver-By trace mode)";
1166                         else if (bitset(QBYNDELAY, q->q_flags))
1167                                 action = "delayed (Deliver-By notify mode)";
1168                         else if (bitset(QBYNRELAY, q->q_flags))
1169                                 action = "relayed (Deliver-By notify mode)";
1170                         else
1171                                 continue;
1172
1173                         if (!putline("", mci))
1174                                 goto writeerr;
1175
1176                         /* Original-Recipient: -- passed from on high */
1177                         if (q->q_orcpt != NULL)
1178                         {
1179                                 p = strchr(q->q_orcpt, ';');
1180
1181                                 /*
1182                                 **  p == NULL shouldn't happen due to
1183                                 **  check in srvrsmtp.c
1184                                 **  we could log an error in this case.
1185                                 */
1186
1187                                 if (p != NULL)
1188                                 {
1189                                         *p = '\0';
1190                                         (void) sm_snprintf(buf, sizeof(buf),
1191                                                 "Original-Recipient: %.100s;%.700s",
1192                                                 q->q_orcpt, xuntextify(p + 1));
1193                                         *p = ';';
1194                                         if (!putline(buf, mci))
1195                                                 goto writeerr;
1196                                 }
1197                         }
1198
1199                         /* Figure out actual recipient */
1200                         actual[0] = '\0';
1201                         if (q->q_user[0] != '\0')
1202                         {
1203                                 if (q->q_mailer != NULL &&
1204                                     q->q_mailer->m_addrtype != NULL)
1205                                         p = q->q_mailer->m_addrtype;
1206                                 else
1207                                         p = "rfc822";
1208
1209                                 if (sm_strcasecmp(p, "rfc822") == 0 &&
1210                                     strchr(q->q_user, '@') == NULL)
1211                                 {
1212                                         (void) sm_snprintf(actual,
1213                                                            sizeof(actual),
1214                                                            "%s; %.700s@%.100s",
1215                                                            p, q->q_user,
1216                                                            MyHostName);
1217                                 }
1218                                 else
1219                                 {
1220                                         (void) sm_snprintf(actual,
1221                                                            sizeof(actual),
1222                                                            "%s; %.800s",
1223                                                            p, q->q_user);
1224                                 }
1225                         }
1226
1227                         /* Final-Recipient: -- the name from the RCPT command */
1228                         if (q->q_finalrcpt == NULL)
1229                         {
1230                                 /* should never happen */
1231                                 sm_syslog(LOG_ERR, e->e_id,
1232                                           "returntosender: q_finalrcpt is NULL");
1233
1234                                 /* try to fall back to the actual recipient */
1235                                 if (actual[0] != '\0')
1236                                         q->q_finalrcpt = sm_rpool_strdup_x(e->e_rpool,
1237                                                                            actual);
1238                         }
1239
1240                         if (q->q_finalrcpt != NULL)
1241                         {
1242                                 (void) sm_snprintf(buf, sizeof(buf),
1243                                                    "Final-Recipient: %s",
1244                                                    q->q_finalrcpt);
1245                                 if (!putline(buf, mci))
1246                                         goto writeerr;
1247                         }
1248
1249                         /* X-Actual-Recipient: -- the real problem address */
1250                         if (actual[0] != '\0' &&
1251                             q->q_finalrcpt != NULL &&
1252                             !bitset(PRIV_NOACTUALRECIPIENT, PrivacyFlags) &&
1253                             strcmp(actual, q->q_finalrcpt) != 0)
1254                         {
1255                                 (void) sm_snprintf(buf, sizeof(buf),
1256                                                    "X-Actual-Recipient: %s",
1257                                                    actual);
1258                                 if (!putline(buf, mci))
1259                                         goto writeerr;
1260                         }
1261
1262                         /* Action: -- what happened? */
1263                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Action: ",
1264                                 action);
1265                         if (!putline(buf, mci))
1266                                 goto writeerr;
1267
1268                         /* Status: -- what _really_ happened? */
1269                         if (q->q_status != NULL)
1270                                 p = q->q_status;
1271                         else if (QS_IS_BADADDR(q->q_state))
1272                                 p = "5.0.0";
1273                         else if (QS_IS_QUEUEUP(q->q_state))
1274                                 p = "4.0.0";
1275                         else
1276                                 p = "2.0.0";
1277                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Status: ", p);
1278                         if (!putline(buf, mci))
1279                                 goto writeerr;
1280
1281                         /* Remote-MTA: -- who was I talking to? */
1282                         if (q->q_statmta != NULL)
1283                         {
1284                                 if (q->q_mailer == NULL ||
1285                                     (p = q->q_mailer->m_mtatype) == NULL)
1286                                         p = "dns";
1287                                 (void) sm_snprintf(buf, sizeof(buf),
1288                                                 "Remote-MTA: %s; %.800s",
1289                                                 p, q->q_statmta);
1290                                 p = &buf[strlen(buf) - 1];
1291                                 if (*p == '.')
1292                                         *p = '\0';
1293                                 if (!putline(buf, mci))
1294                                         goto writeerr;
1295                         }
1296
1297                         /* Diagnostic-Code: -- actual result from other end */
1298                         if (q->q_rstatus != NULL)
1299                         {
1300                                 if (q->q_mailer == NULL ||
1301                                     (p = q->q_mailer->m_diagtype) == NULL)
1302                                         p = "smtp";
1303                                 (void) sm_snprintf(buf, sizeof(buf),
1304                                                 "Diagnostic-Code: %s; %.800s",
1305                                                 p, q->q_rstatus);
1306                                 if (!putline(buf, mci))
1307                                         goto writeerr;
1308                         }
1309
1310                         /* Last-Attempt-Date: -- fine granularity */
1311                         if (q->q_statdate == (time_t) 0L)
1312                                 q->q_statdate = curtime();
1313                         (void) sm_strlcpyn(buf, sizeof(buf), 2,
1314                                         "Last-Attempt-Date: ",
1315                                         arpadate(ctime(&q->q_statdate)));
1316                         if (!putline(buf, mci))
1317                                 goto writeerr;
1318
1319                         /* Will-Retry-Until: -- for delayed messages only */
1320                         if (QS_IS_QUEUEUP(q->q_state))
1321                         {
1322                                 time_t xdate;
1323
1324                                 xdate = e->e_parent->e_ctime +
1325                                         TimeOuts.to_q_return[e->e_parent->e_timeoutclass];
1326                                 (void) sm_strlcpyn(buf, sizeof(buf), 2,
1327                                          "Will-Retry-Until: ",
1328                                          arpadate(ctime(&xdate)));
1329                                 if (!putline(buf, mci))
1330                                         goto writeerr;
1331                         }
1332                 }
1333         }
1334 #endif /* DSN */
1335
1336         /*
1337         **  Output text of original message
1338         */
1339
1340         if (!putline("", mci))
1341                 goto writeerr;
1342         if (bitset(EF_HAS_DF, e->e_parent->e_flags))
1343         {
1344                 sendbody = !bitset(EF_NO_BODY_RETN, e->e_parent->e_flags) &&
1345                            !bitset(EF_NO_BODY_RETN, e->e_flags);
1346
1347                 if (e->e_msgboundary == NULL)
1348                 {
1349                         if (!putline(
1350                                 sendbody
1351                                 ? "   ----- Original message follows -----\n"
1352                                 : "   ----- Message header follows -----\n",
1353                                 mci))
1354                         {
1355                                 goto writeerr;
1356                         }
1357                 }
1358                 else
1359                 {
1360                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "--",
1361                                         e->e_msgboundary);
1362
1363                         if (!putline(buf, mci))
1364                                 goto writeerr;
1365                         (void) sm_strlcpyn(buf, sizeof(buf), 2, "Content-Type: ",
1366                                         sendbody ? "message/rfc822"
1367                                                  : "text/rfc822-headers");
1368                         if (!putline(buf, mci))
1369                                 goto writeerr;
1370
1371                         p = hvalue("Content-Transfer-Encoding",
1372                                    e->e_parent->e_header);
1373                         if (p != NULL && sm_strcasecmp(p, "binary") != 0)
1374                                 p = NULL;
1375                         if (p == NULL &&
1376                             bitset(EF_HAS8BIT, e->e_parent->e_flags))
1377                                 p = "8bit";
1378                         if (p != NULL)
1379                         {
1380                                 (void) sm_snprintf(buf, sizeof(buf),
1381                                                 "Content-Transfer-Encoding: %s",
1382                                                 p);
1383                                 if (!putline(buf, mci))
1384                                         goto writeerr;
1385                         }
1386                 }
1387                 if (!putline("", mci))
1388                         goto writeerr;
1389                 save_errno = errno;
1390                 if (!putheader(mci, e->e_parent->e_header, e->e_parent,
1391                                 M87F_OUTER))
1392                         goto writeerr;
1393                 errno = save_errno;
1394                 if (sendbody)
1395                 {
1396                         if (!putbody(mci, e->e_parent, e->e_msgboundary))
1397                                 goto writeerr;
1398                 }
1399                 else if (e->e_msgboundary == NULL)
1400                 {
1401                         if (!putline("", mci) ||
1402                             !putline("   ----- Message body suppressed -----",
1403                                         mci))
1404                         {
1405                                 goto writeerr;
1406                         }
1407                 }
1408         }
1409         else if (e->e_msgboundary == NULL)
1410         {
1411                 if (!putline("  ----- No message was collected -----\n", mci))
1412                         goto writeerr;
1413         }
1414
1415         if (e->e_msgboundary != NULL)
1416         {
1417                 (void) sm_strlcpyn(buf, sizeof(buf), 3, "--", e->e_msgboundary,
1418                                    "--");
1419                 if (!putline("", mci) || !putline(buf, mci))
1420                         goto writeerr;
1421         }
1422         if (!putline("", mci) ||
1423             sm_io_flush(mci->mci_out, SM_TIME_DEFAULT) == SM_IO_EOF)
1424                         goto writeerr;
1425
1426         /*
1427         **  Cleanup and exit
1428         */
1429
1430         if (errno != 0)
1431         {
1432   writeerr:
1433                 syserr("errbody: I/O error");
1434                 return false;
1435         }
1436         return true;
1437 }
1438
1439 /*
1440 **  SMTPTODSN -- convert SMTP to DSN status code
1441 **
1442 **      Parameters:
1443 **              smtpstat -- the smtp status code (e.g., 550).
1444 **
1445 **      Returns:
1446 **              The DSN version of the status code.
1447 **
1448 **      Storage Management:
1449 **              smtptodsn() returns a pointer to a character string literal,
1450 **              which will remain valid forever, and thus does not need to
1451 **              be copied.  Current code relies on this property.
1452 */
1453
1454 char *
1455 smtptodsn(smtpstat)
1456         int smtpstat;
1457 {
1458         if (smtpstat < 0)
1459                 return "4.4.2";
1460
1461         switch (smtpstat)
1462         {
1463           case 450:     /* Req mail action not taken: mailbox unavailable */
1464                 return "4.2.0";
1465
1466           case 451:     /* Req action aborted: local error in processing */
1467                 return "4.3.0";
1468
1469           case 452:     /* Req action not taken: insufficient sys storage */
1470                 return "4.3.1";
1471
1472           case 500:     /* Syntax error, command unrecognized */
1473                 return "5.5.2";
1474
1475           case 501:     /* Syntax error in parameters or arguments */
1476                 return "5.5.4";
1477
1478           case 502:     /* Command not implemented */
1479                 return "5.5.1";
1480
1481           case 503:     /* Bad sequence of commands */
1482                 return "5.5.1";
1483
1484           case 504:     /* Command parameter not implemented */
1485                 return "5.5.4";
1486
1487           case 550:     /* Req mail action not taken: mailbox unavailable */
1488                 return "5.2.0";
1489
1490           case 551:     /* User not local; please try <...> */
1491                 return "5.1.6";
1492
1493           case 552:     /* Req mail action aborted: exceeded storage alloc */
1494                 return "5.2.2";
1495
1496           case 553:     /* Req action not taken: mailbox name not allowed */
1497                 return "5.1.0";
1498
1499           case 554:     /* Transaction failed */
1500                 return "5.0.0";
1501         }
1502
1503         if (REPLYTYPE(smtpstat) == 2)
1504                 return "2.0.0";
1505         if (REPLYTYPE(smtpstat) == 4)
1506                 return "4.0.0";
1507         return "5.0.0";
1508 }
1509 /*
1510 **  XTEXTIFY -- take regular text and turn it into DSN-style xtext
1511 **
1512 **      Parameters:
1513 **              t -- the text to convert.
1514 **              taboo -- additional characters that must be encoded.
1515 **
1516 **      Returns:
1517 **              The xtext-ified version of the same string.
1518 */
1519
1520 char *
1521 xtextify(t, taboo)
1522         register char *t;
1523         char *taboo;
1524 {
1525         register char *p;
1526         int l;
1527         int nbogus;
1528         static char *bp = NULL;
1529         static int bplen = 0;
1530
1531         if (taboo == NULL)
1532                 taboo = "";
1533
1534         /* figure out how long this xtext will have to be */
1535         nbogus = l = 0;
1536         for (p = t; *p != '\0'; p++)
1537         {
1538                 register int c = (*p & 0xff);
1539
1540                 /* ASCII dependence here -- this is the way the spec words it */
1541                 if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1542                     strchr(taboo, c) != NULL)
1543                         nbogus++;
1544                 l++;
1545         }
1546         if (nbogus < 0)
1547         {
1548                 /* since nbogus is ssize_t and wrapped, 2 * size_t would wrap */
1549                 syserr("!xtextify string too long");
1550         }
1551         if (nbogus == 0)
1552                 return t;
1553         l += nbogus * 2 + 1;
1554
1555         /* now allocate space if necessary for the new string */
1556         if (l > bplen)
1557         {
1558                 if (bp != NULL)
1559                         sm_free(bp); /* XXX */
1560                 bp = sm_pmalloc_x(l);
1561                 bplen = l;
1562         }
1563
1564         /* ok, copy the text with byte expansion */
1565         for (p = bp; *t != '\0'; )
1566         {
1567                 register int c = (*t++ & 0xff);
1568
1569                 /* ASCII dependence here -- this is the way the spec words it */
1570                 if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1571                     strchr(taboo, c) != NULL)
1572                 {
1573                         *p++ = '+';
1574                         *p++ = "0123456789ABCDEF"[c >> 4];
1575                         *p++ = "0123456789ABCDEF"[c & 0xf];
1576                 }
1577                 else
1578                         *p++ = c;
1579         }
1580         *p = '\0';
1581         return bp;
1582 }
1583 /*
1584 **  XUNTEXTIFY -- take xtext and turn it into plain text
1585 **
1586 **      Parameters:
1587 **              t -- the xtextified text.
1588 **
1589 **      Returns:
1590 **              The decoded text.  No attempt is made to deal with
1591 **              null strings in the resulting text.
1592 */
1593
1594 char *
1595 xuntextify(t)
1596         register char *t;
1597 {
1598         register char *p;
1599         int l;
1600         static char *bp = NULL;
1601         static int bplen = 0;
1602
1603         /* heuristic -- if no plus sign, just return the input */
1604         if (strchr(t, '+') == NULL)
1605                 return t;
1606
1607         /* xtext is always longer than decoded text */
1608         l = strlen(t);
1609         if (l > bplen)
1610         {
1611                 if (bp != NULL)
1612                         sm_free(bp); /* XXX */
1613                 bp = xalloc(l);
1614                 bplen = l;
1615         }
1616
1617         /* ok, copy the text with byte compression */
1618         for (p = bp; *t != '\0'; t++)
1619         {
1620                 register int c = *t & 0xff;
1621
1622                 if (c != '+')
1623                 {
1624                         *p++ = c;
1625                         continue;
1626                 }
1627
1628                 c = *++t & 0xff;
1629                 if (!isascii(c) || !isxdigit(c))
1630                 {
1631                         /* error -- first digit is not hex */
1632                         usrerr("bogus xtext: +%c", c);
1633                         t--;
1634                         continue;
1635                 }
1636                 if (isdigit(c))
1637                         c -= '0';
1638                 else if (isupper(c))
1639                         c -= 'A' - 10;
1640                 else
1641                         c -= 'a' - 10;
1642                 *p = c << 4;
1643
1644                 c = *++t & 0xff;
1645                 if (!isascii(c) || !isxdigit(c))
1646                 {
1647                         /* error -- second digit is not hex */
1648                         usrerr("bogus xtext: +%x%c", *p >> 4, c);
1649                         t--;
1650                         continue;
1651                 }
1652                 if (isdigit(c))
1653                         c -= '0';
1654                 else if (isupper(c))
1655                         c -= 'A' - 10;
1656                 else
1657                         c -= 'a' - 10;
1658                 *p++ |= c;
1659         }
1660         *p = '\0';
1661         return bp;
1662 }
1663 /*
1664 **  XTEXTOK -- check if a string is legal xtext
1665 **
1666 **      Xtext is used in Delivery Status Notifications.  The spec was
1667 **      taken from RFC 1891, ``SMTP Service Extension for Delivery
1668 **      Status Notifications''.
1669 **
1670 **      Parameters:
1671 **              s -- the string to check.
1672 **
1673 **      Returns:
1674 **              true -- if 's' is legal xtext.
1675 **              false -- if it has any illegal characters in it.
1676 */
1677
1678 bool
1679 xtextok(s)
1680         char *s;
1681 {
1682         int c;
1683
1684         while ((c = *s++) != '\0')
1685         {
1686                 if (c == '+')
1687                 {
1688                         c = *s++;
1689                         if (!isascii(c) || !isxdigit(c))
1690                                 return false;
1691                         c = *s++;
1692                         if (!isascii(c) || !isxdigit(c))
1693                                 return false;
1694                 }
1695                 else if (c < '!' || c > '~' || c == '=')
1696                         return false;
1697         }
1698         return true;
1699 }
1700
1701 /*
1702 **  ISATOM -- check if a string is an "atom"
1703 **
1704 **      Parameters:
1705 **              s -- the string to check.
1706 **
1707 **      Returns:
1708 **              true -- iff s is an atom
1709 */
1710
1711 bool
1712 isatom(s)
1713         const char *s;
1714 {
1715         int c;
1716
1717         if (s == NULL || *s == '\0')
1718                 return false;
1719         while ((c = *s++) != '\0')
1720         {
1721                 if (strchr("()<>@,;:\\.[]\"", c) != NULL)
1722                         return false;
1723                 if (c < '!' || c > '~')
1724                         return false;
1725         }
1726         return true;
1727 }
1728 /*
1729 **  PRUNEROUTE -- prune an RFC-822 source route
1730 **
1731 **      Trims down a source route to the last internet-registered hop.
1732 **      This is encouraged by RFC 1123 section 5.3.3.
1733 **
1734 **      Parameters:
1735 **              addr -- the address
1736 **
1737 **      Returns:
1738 **              true -- address was modified
1739 **              false -- address could not be pruned
1740 **
1741 **      Side Effects:
1742 **              modifies addr in-place
1743 */
1744
1745 static bool
1746 pruneroute(addr)
1747         char *addr;
1748 {
1749 #if NAMED_BIND
1750         char *start, *at, *comma;
1751         char c;
1752         int braclev;
1753         int rcode;
1754         int i;
1755         char hostbuf[BUFSIZ];
1756         char *mxhosts[MAXMXHOSTS + 1];
1757
1758         /* check to see if this is really a route-addr */
1759         if (*addr != '<' || addr[1] != '@' || addr[strlen(addr) - 1] != '>')
1760                 return false;
1761
1762         /*
1763         **  Can't simply find the first ':' is the address might be in the
1764         **  form:  "<@[IPv6:::1]:user@host>" and the first ':' in inside
1765         **  the IPv6 address.
1766         */
1767
1768         start = addr;
1769         braclev = 0;
1770         while (*start != '\0')
1771         {
1772                 if (*start == ':' && braclev <= 0)
1773                         break;
1774                 else if (*start == '[')
1775                         braclev++;
1776                 else if (*start == ']' && braclev > 0)
1777                         braclev--;
1778                 start++;
1779         }
1780         if (braclev > 0 || *start != ':')
1781                 return false;
1782
1783         at = strrchr(addr, '@');
1784         if (at == NULL || at < start)
1785                 return false;
1786
1787         /* slice off the angle brackets */
1788         i = strlen(at + 1);
1789         if (i >= sizeof(hostbuf))
1790                 return false;
1791         (void) sm_strlcpy(hostbuf, at + 1, sizeof(hostbuf));
1792         hostbuf[i - 1] = '\0';
1793
1794         while (start != NULL)
1795         {
1796                 if (getmxrr(hostbuf, mxhosts, NULL, false,
1797                             &rcode, true, NULL) > 0)
1798                 {
1799                         (void) sm_strlcpy(addr + 1, start + 1,
1800                                           strlen(addr) - 1);
1801                         return true;
1802                 }
1803                 c = *start;
1804                 *start = '\0';
1805                 comma = strrchr(addr, ',');
1806                 if (comma != NULL && comma[1] == '@' &&
1807                     strlen(comma + 2) < sizeof(hostbuf))
1808                         (void) sm_strlcpy(hostbuf, comma + 2, sizeof(hostbuf));
1809                 else
1810                         comma = NULL;
1811                 *start = c;
1812                 start = comma;
1813         }
1814 #endif /* NAMED_BIND */
1815         return false;
1816 }