contrib/sendmail/src/headers.c

   1 /*
   2  * Copyright (c) 1998-2004, 2006, 2007 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 #include <sm/sendmail.h>
  16
  17 SM_RCSID("@(#)$Id: headers.c,v 8.320 2013-11-22 20:51:55 ca Exp $")
  18
  19 static HDR      *allocheader __P((char *, char *, int, SM_RPOOL_T *, bool));
  20 static size_t   fix_mime_header __P((HDR *, ENVELOPE *));
  21 static int      priencode __P((char *));
  22 static bool     put_vanilla_header __P((HDR *, char *, MCI *));
  23
  24 /*
  25 **  SETUPHEADERS -- initialize headers in symbol table
  26 **
  27 **      Parameters:
  28 **              none
  29 **
  30 **      Returns:
  31 **              none
  32 */
  33
  34 void
  35 setupheaders()
  36 {
  37         struct hdrinfo *hi;
  38         STAB *s;
  39
  40         for (hi = HdrInfo; hi->hi_field != NULL; hi++)
  41         {
  42                 s = stab(hi->hi_field, ST_HEADER, ST_ENTER);
  43                 s->s_header.hi_flags = hi->hi_flags;
  44                 s->s_header.hi_ruleset = NULL;
  45         }
  46 }
  47
  48 /*
  49 **  DOCHOMPHEADER -- process and save a header line.
  50 **
  51 **      Called by chompheader.
  52 **
  53 **      Parameters:
  54 **              line -- header as a text line.
  55 **              pflag -- flags for chompheader() (from sendmail.h)
  56 **              hdrp -- a pointer to the place to save the header.
  57 **              e -- the envelope including this header.
  58 **
  59 **      Returns:
  60 **              flags for this header.
  61 **
  62 **      Side Effects:
  63 **              The header is saved on the header list.
  64 **              Contents of 'line' are destroyed.
  65 */
  66
  67 static struct hdrinfo   NormalHeader =  { NULL, 0, NULL };
  68 static unsigned long    dochompheader __P((char *, int, HDR **, ENVELOPE *));
  69
  70 static unsigned long
  71 dochompheader(line, pflag, hdrp, e)
  72         char *line;
  73         int pflag;
  74         HDR **hdrp;
  75         ENVELOPE *e;
  76 {
  77         unsigned char mid = '\0';
  78         register char *p;
  79         register HDR *h;
  80         HDR **hp;
  81         char *fname;
  82         char *fvalue;
  83         bool cond = false;
  84         bool dropfrom;
  85         bool headeronly;
  86         STAB *s;
  87         struct hdrinfo *hi;
  88         bool nullheader = false;
  89         BITMAP256 mopts;
  90
  91         headeronly = hdrp != NULL;
  92         if (!headeronly)
  93                 hdrp = &e->e_header;
  94
  95         /* strip off options */
  96         clrbitmap(mopts);
  97         p = line;
  98         if (!bitset(pflag, CHHDR_USER) && *p == '?')
  99         {
 100                 int c;
 101                 register char *q;
 102
 103                 q = strchr(++p, '?');
 104                 if (q == NULL)
 105                         goto hse;
 106
 107                 *q = '\0';
 108                 c = *p & 0377;
 109
 110                 /* possibly macro conditional */
 111                 if (c == MACROEXPAND)
 112                 {
 113                         /* catch ?$? */
 114                         if (*++p == '\0')
 115                         {
 116                                 *q = '?';
 117                                 goto hse;
 118                         }
 119
 120                         mid = (unsigned char) *p++;
 121
 122                         /* catch ?$abc? */
 123                         if (*p != '\0')
 124                         {
 125                                 *q = '?';
 126                                 goto hse;
 127                         }
 128                 }
 129                 else if (*p == '$')
 130                 {
 131                         /* catch ?$? */
 132                         if (*++p == '\0')
 133                         {
 134                                 *q = '?';
 135                                 goto hse;
 136                         }
 137
 138                         mid = (unsigned char) macid(p);
 139                         if (bitset(0200, mid))
 140                         {
 141                                 p += strlen(macname(mid)) + 2;
 142                                 SM_ASSERT(p <= q);
 143                         }
 144                         else
 145                                 p++;
 146
 147                         /* catch ?$abc? */
 148                         if (*p != '\0')
 149                         {
 150                                 *q = '?';
 151                                 goto hse;
 152                         }
 153                 }
 154                 else
 155                 {
 156                         while (*p != '\0')
 157                         {
 158                                 if (!isascii(*p))
 159                                 {
 160                                         *q = '?';
 161                                         goto hse;
 162                                 }
 163
 164                                 setbitn(bitidx(*p), mopts);
 165                                 cond = true;
 166                                 p++;
 167                         }
 168                 }
 169                 p = q + 1;
 170         }
 171
 172         /* find canonical name */
 173         fname = p;
 174         while (isascii(*p) && isgraph(*p) && *p != ':')
 175                 p++;
 176         fvalue = p;
 177         while (SM_ISSPACE(*p))
 178                 p++;
 179         if (*p++ != ':' || fname == fvalue)
 180         {
 181 hse:
 182                 syserr("553 5.3.0 header syntax error, line \"%s\"", line);
 183                 return 0;
 184         }
 185         *fvalue = '\0';
 186         fvalue = p;
 187
 188         /* if the field is null, go ahead and use the default */
 189         while (SM_ISSPACE(*p))
 190                 p++;
 191         if (*p == '\0')
 192                 nullheader = true;
 193
 194         /* security scan: long field names are end-of-header */
 195         if (strlen(fname) > 100)
 196                 return H_EOH;
 197
 198         /* check to see if it represents a ruleset call */
 199         if (bitset(pflag, CHHDR_DEF))
 200         {
 201                 char hbuf[50];
 202
 203                 (void) expand(fvalue, hbuf, sizeof(hbuf), e);
 204                 for (p = hbuf; SM_ISSPACE(*p); )
 205                         p++;
 206                 if ((*p++ & 0377) == CALLSUBR)
 207                 {
 208                         auto char *endp;
 209                         bool strc;
 210
 211                         strc = *p == '+';       /* strip comments? */
 212                         if (strc)
 213                                 ++p;
 214                         if (strtorwset(p, &endp, ST_ENTER) > 0)
 215                         {
 216                                 *endp = '\0';
 217                                 s = stab(fname, ST_HEADER, ST_ENTER);
 218                                 if (LogLevel > 9 &&
 219                                     s->s_header.hi_ruleset != NULL)
 220                                         sm_syslog(LOG_WARNING, NOQID,
 221                                                   "Warning: redefined ruleset for header=%s, old=%s, new=%s",
 222                                                   fname,
 223                                                   s->s_header.hi_ruleset, p);
 224                                 s->s_header.hi_ruleset = newstr(p);
 225                                 if (!strc)
 226                                         s->s_header.hi_flags |= H_STRIPCOMM;
 227                         }
 228                         return 0;
 229                 }
 230         }
 231
 232         /* see if it is a known type */
 233         s = stab(fname, ST_HEADER, ST_FIND);
 234         if (s != NULL)
 235                 hi = &s->s_header;
 236         else
 237                 hi = &NormalHeader;
 238
 239         if (tTd(31, 9))
 240         {
 241                 if (s == NULL)
 242                         sm_dprintf("no header flags match\n");
 243                 else
 244                         sm_dprintf("header match, flags=%lx, ruleset=%s\n",
 245                                    hi->hi_flags,
 246                                    hi->hi_ruleset == NULL ? "<NULL>"
 247                                                           : hi->hi_ruleset);
 248         }
 249
 250         /* see if this is a resent message */
 251         if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
 252             bitset(H_RESENT, hi->hi_flags))
 253                 e->e_flags |= EF_RESENT;
 254
 255         /* if this is an Errors-To: header keep track of it now */
 256         if (UseErrorsTo && !bitset(pflag, CHHDR_DEF) && !headeronly &&
 257             bitset(H_ERRORSTO, hi->hi_flags))
 258                 (void) sendtolist(fvalue, NULLADDR, &e->e_errorqueue, 0, e);
 259
 260         /* if this means "end of header" quit now */
 261         if (!headeronly && bitset(H_EOH, hi->hi_flags))
 262                 return hi->hi_flags;
 263
 264         /*
 265         **  Horrible hack to work around problem with Lotus Notes SMTP
 266         **  mail gateway, which generates From: headers with newlines in
 267         **  them and the <address> on the second line.  Although this is
 268         **  legal RFC 822, many MUAs don't handle this properly and thus
 269         **  never find the actual address.
 270         */
 271
 272         if (bitset(H_FROM, hi->hi_flags) && SingleLineFromHeader)
 273         {
 274                 while ((p = strchr(fvalue, '\n')) != NULL)
 275                         *p = ' ';
 276         }
 277
 278         /*
 279         **  If there is a check ruleset, verify it against the header.
 280         */
 281
 282         if (bitset(pflag, CHHDR_CHECK))
 283         {
 284                 int rscheckflags;
 285                 char *rs;
 286
 287                 rscheckflags = RSF_COUNT;
 288                 if (!bitset(hi->hi_flags, H_FROM|H_RCPT))
 289                         rscheckflags |= RSF_UNSTRUCTURED;
 290
 291                 /* no ruleset? look for default */
 292                 rs = hi->hi_ruleset;
 293                 if (rs == NULL)
 294                 {
 295                         s = stab("*", ST_HEADER, ST_FIND);
 296                         if (s != NULL)
 297                         {
 298                                 rs = (&s->s_header)->hi_ruleset;
 299                                 if (bitset((&s->s_header)->hi_flags,
 300                                            H_STRIPCOMM))
 301                                         rscheckflags |= RSF_RMCOMM;
 302                         }
 303                 }
 304                 else if (bitset(hi->hi_flags, H_STRIPCOMM))
 305                         rscheckflags |= RSF_RMCOMM;
 306                 if (rs != NULL)
 307                 {
 308                         int l, k;
 309                         char qval[MAXNAME];
 310
 311                         l = 0;
 312                         qval[l++] = '"';
 313
 314                         /* - 3 to avoid problems with " at the end */
 315                         /* should be sizeof(qval), not MAXNAME */
 316                         for (k = 0; fvalue[k] != '\0' && l < MAXNAME - 3; k++)
 317                         {
 318                                 switch (fvalue[k])
 319                                 {
 320                                   /* XXX other control chars? */
 321                                   case '\011': /* ht */
 322                                   case '\012': /* nl */
 323                                   case '\013': /* vt */
 324                                   case '\014': /* np */
 325                                   case '\015': /* cr */
 326                                         qval[l++] = ' ';
 327                                         break;
 328                                   case '"':
 329                                         qval[l++] = '\\';
 330                                         /* FALLTHROUGH */
 331                                   default:
 332                                         qval[l++] = fvalue[k];
 333                                         break;
 334                                 }
 335                         }
 336                         qval[l++] = '"';
 337                         qval[l] = '\0';
 338                         k += strlen(fvalue + k);
 339                         if (k >= MAXNAME)
 340                         {
 341                                 if (LogLevel > 9)
 342                                         sm_syslog(LOG_WARNING, e->e_id,
 343                                                   "Warning: truncated header '%s' before check with '%s' len=%d max=%d",
 344                                                   fname, rs, k, MAXNAME - 1);
 345                         }
 346                         macdefine(&e->e_macro, A_TEMP,
 347                                 macid("{currHeader}"), qval);
 348                         macdefine(&e->e_macro, A_TEMP,
 349                                 macid("{hdr_name}"), fname);
 350
 351                         (void) sm_snprintf(qval, sizeof(qval), "%d", k);
 352                         macdefine(&e->e_macro, A_TEMP, macid("{hdrlen}"), qval);
 353                         if (bitset(H_FROM, hi->hi_flags))
 354                                 macdefine(&e->e_macro, A_PERM,
 355                                         macid("{addr_type}"), "h s");
 356                         else if (bitset(H_RCPT, hi->hi_flags))
 357                                 macdefine(&e->e_macro, A_PERM,
 358                                         macid("{addr_type}"), "h r");
 359                         else
 360                                 macdefine(&e->e_macro, A_PERM,
 361                                         macid("{addr_type}"), "h");
 362                         (void) rscheck(rs, fvalue, NULL, e, rscheckflags, 3,
 363                                        NULL, e->e_id, NULL, NULL);
 364                 }
 365         }
 366
 367         /*
 368         **  Drop explicit From: if same as what we would generate.
 369         **  This is to make MH (which doesn't always give a full name)
 370         **  insert the full name information in all circumstances.
 371         */
 372
 373         dropfrom = false;
 374         p = "resent-from";
 375         if (!bitset(EF_RESENT, e->e_flags))
 376                 p += 7;
 377         if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
 378             !bitset(EF_QUEUERUN, e->e_flags) && sm_strcasecmp(fname, p) == 0)
 379         {
 380                 if (e->e_from.q_paddr != NULL &&
 381                     e->e_from.q_mailer != NULL &&
 382                     bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags) &&
 383                     (strcmp(fvalue, e->e_from.q_paddr) == 0 ||
 384                      strcmp(fvalue, e->e_from.q_user) == 0))
 385                         dropfrom = true;
 386                 if (tTd(31, 2))
 387                 {
 388                         sm_dprintf("comparing header from (%s) against default (%s or %s), drop=%d\n",
 389                                 fvalue, e->e_from.q_paddr, e->e_from.q_user,
 390                                 dropfrom);
 391                 }
 392         }
 393
 394         /* delete default value for this header */
 395         for (hp = hdrp; (h = *hp) != NULL; hp = &h->h_link)
 396         {
 397                 if (sm_strcasecmp(fname, h->h_field) == 0 &&
 398                     !bitset(H_USER, h->h_flags) &&
 399                     !bitset(H_FORCE, h->h_flags))
 400                 {
 401                         if (nullheader)
 402                         {
 403                                 /* user-supplied value was null */
 404                                 return 0;
 405                         }
 406                         if (dropfrom)
 407                         {
 408                                 /* make this look like the user entered it */
 409                                 h->h_flags |= H_USER;
 410
 411                                 /*
 412                                 **  If the MH hack is selected, allow to turn
 413                                 **  it off via a mailer flag to avoid problems
 414                                 **  with setups that remove the F flag from
 415                                 **  the RCPT mailer.
 416                                 */
 417
 418                                 if (bitnset(M_NOMHHACK,
 419                                             e->e_from.q_mailer->m_flags))
 420                                 {
 421                                         h->h_flags &= ~H_CHECK;
 422                                 }
 423                                 return hi->hi_flags;
 424                         }
 425                         h->h_value = NULL;
 426                         if (!cond)
 427                         {
 428                                 /* copy conditions from default case */
 429                                 memmove((char *) mopts, (char *) h->h_mflags,
 430                                         sizeof(mopts));
 431                         }
 432                         h->h_macro = mid;
 433                 }
 434         }
 435
 436         /* create a new node */
 437         h = (HDR *) sm_rpool_malloc_x(e->e_rpool, sizeof(*h));
 438         h->h_field = sm_rpool_strdup_x(e->e_rpool, fname);
 439         h->h_value = sm_rpool_strdup_x(e->e_rpool, fvalue);
 440         h->h_link = NULL;
 441         memmove((char *) h->h_mflags, (char *) mopts, sizeof(mopts));
 442         h->h_macro = mid;
 443         *hp = h;
 444         h->h_flags = hi->hi_flags;
 445         if (bitset(pflag, CHHDR_USER) || bitset(pflag, CHHDR_QUEUE))
 446                 h->h_flags |= H_USER;
 447
 448         /* strip EOH flag if parsing MIME headers */
 449         if (headeronly)
 450                 h->h_flags &= ~H_EOH;
 451         if (bitset(pflag, CHHDR_DEF))
 452                 h->h_flags |= H_DEFAULT;
 453         if (cond || mid != '\0')
 454                 h->h_flags |= H_CHECK;
 455
 456         /* hack to see if this is a new format message */
 457         if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
 458             bitset(H_RCPT|H_FROM, h->h_flags) &&
 459             (strchr(fvalue, ',') != NULL || strchr(fvalue, '(') != NULL ||
 460              strchr(fvalue, '<') != NULL || strchr(fvalue, ';') != NULL))
 461         {
 462                 e->e_flags &= ~EF_OLDSTYLE;
 463         }
 464
 465         return h->h_flags;
 466 }
 467
 468 /*
 469 **  CHOMPHEADER -- process and save a header line.
 470 **
 471 **      Called by collect, readcf, and readqf to deal with header lines.
 472 **      This is just a wrapper for dochompheader().
 473 **
 474 **      Parameters:
 475 **              line -- header as a text line.
 476 **              pflag -- flags for chompheader() (from sendmail.h)
 477 **              hdrp -- a pointer to the place to save the header.
 478 **              e -- the envelope including this header.
 479 **
 480 **      Returns:
 481 **              flags for this header.
 482 **
 483 **      Side Effects:
 484 **              The header is saved on the header list.
 485 **              Contents of 'line' are destroyed.
 486 */
 487
 488
 489 unsigned long
 490 chompheader(line, pflag, hdrp, e)
 491         char *line;
 492         int pflag;
 493         HDR **hdrp;
 494         register ENVELOPE *e;
 495 {
 496         unsigned long rval;
 497
 498         if (tTd(31, 6))
 499         {
 500                 sm_dprintf("chompheader: ");
 501                 xputs(sm_debug_file(), line);
 502                 sm_dprintf("\n");
 503         }
 504
 505         /* quote this if user (not config file) input */
 506         if (bitset(pflag, CHHDR_USER))
 507         {
 508                 char xbuf[MAXLINE];
 509                 char *xbp = NULL;
 510                 int xbufs;
 511
 512                 xbufs = sizeof(xbuf);
 513                 xbp = quote_internal_chars(line, xbuf, &xbufs);
 514                 if (tTd(31, 7))
 515                 {
 516                         sm_dprintf("chompheader: quoted: ");
 517                         xputs(sm_debug_file(), xbp);
 518                         sm_dprintf("\n");
 519                 }
 520                 rval = dochompheader(xbp, pflag, hdrp, e);
 521                 if (xbp != xbuf)
 522                         sm_free(xbp);
 523         }
 524         else
 525                 rval = dochompheader(line, pflag, hdrp, e);
 526
 527         return rval;
 528 }
 529
 530 /*
 531 **  ALLOCHEADER -- allocate a header entry
 532 **
 533 **      Parameters:
 534 **              field -- the name of the header field (will not be copied).
 535 **              value -- the value of the field (will be copied).
 536 **              flags -- flags to add to h_flags.
 537 **              rp -- resource pool for allocations
 538 **              space -- add leading space?
 539 **
 540 **      Returns:
 541 **              Pointer to a newly allocated and populated HDR.
 542 **
 543 **      Notes:
 544 **              o field and value must be in internal format, i.e.,
 545 **              metacharacters must be "quoted", see quote_internal_chars().
 546 **              o maybe add more flags to decide:
 547 **                - what to copy (field/value)
 548 **                - whether to convert value to an internal format
 549 */
 550
 551 static HDR *
 552 allocheader(field, value, flags, rp, space)
 553         char *field;
 554         char *value;
 555         int flags;
 556         SM_RPOOL_T *rp;
 557         bool space;
 558 {
 559         HDR *h;
 560         STAB *s;
 561
 562         /* find info struct */
 563         s = stab(field, ST_HEADER, ST_FIND);
 564
 565         /* allocate space for new header */
 566         h = (HDR *) sm_rpool_malloc_x(rp, sizeof(*h));
 567         h->h_field = field;
 568         if (space)
 569         {
 570                 size_t l;
 571                 char *n;
 572
 573                 l = strlen(value);
 574                 SM_ASSERT(l + 2 > l);
 575                 n = sm_rpool_malloc_x(rp, l + 2);
 576                 n[0] = ' ';
 577                 n[1] = '\0';
 578                 sm_strlcpy(n + 1, value, l + 1);
 579                 h->h_value = n;
 580         }
 581         else
 582                 h->h_value = sm_rpool_strdup_x(rp, value);
 583         h->h_flags = flags;
 584         if (s != NULL)
 585                 h->h_flags |= s->s_header.hi_flags;
 586         clrbitmap(h->h_mflags);
 587         h->h_macro = '\0';
 588
 589         return h;
 590 }
 591
 592 /*
 593 **  ADDHEADER -- add a header entry to the end of the queue.
 594 **
 595 **      This bypasses the special checking of chompheader.
 596 **
 597 **      Parameters:
 598 **              field -- the name of the header field (will not be copied).
 599 **              value -- the value of the field (will be copied).
 600 **              flags -- flags to add to h_flags.
 601 **              e -- envelope.
 602 **              space -- add leading space?
 603 **
 604 **      Returns:
 605 **              none.
 606 **
 607 **      Side Effects:
 608 **              adds the field on the list of headers for this envelope.
 609 **
 610 **      Notes: field and value must be in internal format, i.e.,
 611 **              metacharacters must be "quoted", see quote_internal_chars().
 612 */
 613
 614 void
 615 addheader(field, value, flags, e, space)
 616         char *field;
 617         char *value;
 618         int flags;
 619         ENVELOPE *e;
 620         bool space;
 621 {
 622         register HDR *h;
 623         HDR **hp;
 624         HDR **hdrlist = &e->e_header;
 625
 626         /* find current place in list -- keep back pointer? */
 627         for (hp = hdrlist; (h = *hp) != NULL; hp = &h->h_link)
 628         {
 629                 if (sm_strcasecmp(field, h->h_field) == 0)
 630                         break;
 631         }
 632
 633         /* allocate space for new header */
 634         h = allocheader(field, value, flags, e->e_rpool, space);
 635         h->h_link = *hp;
 636         *hp = h;
 637 }
 638
 639 /*
 640 **  INSHEADER -- insert a header entry at the specified index
 641 **      This bypasses the special checking of chompheader.
 642 **
 643 **      Parameters:
 644 **              idx -- index into the header list at which to insert
 645 **              field -- the name of the header field (will be copied).
 646 **              value -- the value of the field (will be copied).
 647 **              flags -- flags to add to h_flags.
 648 **              e -- envelope.
 649 **              space -- add leading space?
 650 **
 651 **      Returns:
 652 **              none.
 653 **
 654 **      Side Effects:
 655 **              inserts the field on the list of headers for this envelope.
 656 **
 657 **      Notes:
 658 **              - field and value must be in internal format, i.e.,
 659 **              metacharacters must be "quoted", see quote_internal_chars().
 660 **              - the header list contains headers that might not be
 661 **              sent "out" (see putheader(): "skip"), hence there is no
 662 **              reliable way to insert a header at an exact position
 663 **              (except at the front or end).
 664 */
 665
 666 void
 667 insheader(idx, field, value, flags, e, space)
 668         int idx;
 669         char *field;
 670         char *value;
 671         int flags;
 672         ENVELOPE *e;
 673         bool space;
 674 {
 675         HDR *h, *srch, *last = NULL;
 676
 677         /* allocate space for new header */
 678         h = allocheader(field, value, flags, e->e_rpool, space);
 679
 680         /* find insertion position */
 681         for (srch = e->e_header; srch != NULL && idx > 0;
 682              srch = srch->h_link, idx--)
 683                 last = srch;
 684
 685         if (e->e_header == NULL)
 686         {
 687                 e->e_header = h;
 688                 h->h_link = NULL;
 689         }
 690         else if (srch == NULL)
 691         {
 692                 SM_ASSERT(last != NULL);
 693                 last->h_link = h;
 694                 h->h_link = NULL;
 695         }
 696         else
 697         {
 698                 h->h_link = srch->h_link;
 699                 srch->h_link = h;
 700         }
 701 }
 702
 703 /*
 704 **  HVALUE -- return value of a header.
 705 **
 706 **      Only "real" fields (i.e., ones that have not been supplied
 707 **      as a default) are used.
 708 **
 709 **      Parameters:
 710 **              field -- the field name.
 711 **              header -- the header list.
 712 **
 713 **      Returns:
 714 **              pointer to the value part (internal format).
 715 **              NULL if not found.
 716 **
 717 **      Side Effects:
 718 **              none.
 719 */
 720
 721 char *
 722 hvalue(field, header)
 723         char *field;
 724         HDR *header;
 725 {
 726         register HDR *h;
 727
 728         for (h = header; h != NULL; h = h->h_link)
 729         {
 730                 if (!bitset(H_DEFAULT, h->h_flags) &&
 731                     sm_strcasecmp(h->h_field, field) == 0)
 732                 {
 733                         char *s;
 734
 735                         s = h->h_value;
 736                         if (s == NULL)
 737                                 return NULL;
 738                         while (SM_ISSPACE(*s))
 739                                 s++;
 740                         return s;
 741                 }
 742         }
 743         return NULL;
 744 }
 745
 746 /*
 747 **  ISHEADER -- predicate telling if argument is a header.
 748 **
 749 **      A line is a header if it has a single word followed by
 750 **      optional white space followed by a colon.
 751 **
 752 **      Header fields beginning with two dashes, although technically
 753 **      permitted by RFC822, are automatically rejected in order
 754 **      to make MIME work out.  Without this we could have a technically
 755 **      legal header such as ``--"foo:bar"'' that would also be a legal
 756 **      MIME separator.
 757 **
 758 **      Parameters:
 759 **              h -- string to check for possible headerness.
 760 **
 761 **      Returns:
 762 **              true if h is a header.
 763 **              false otherwise.
 764 **
 765 **      Side Effects:
 766 **              none.
 767 */
 768
 769 bool
 770 isheader(h)
 771         char *h;
 772 {
 773         char *s;
 774
 775         s = h;
 776         if (s[0] == '-' && s[1] == '-')
 777                 return false;
 778
 779         while (*s > ' ' && *s != ':' && *s != '\0')
 780                 s++;
 781
 782         if (h == s)
 783                 return false;
 784
 785         /* following technically violates RFC822 */
 786         while (SM_ISSPACE(*s))
 787                 s++;
 788
 789         return (*s == ':');
 790 }
 791
 792 /*
 793 **  EATHEADER -- run through the stored header and extract info.
 794 **
 795 **      Parameters:
 796 **              e -- the envelope to process.
 797 **              full -- if set, do full processing (e.g., compute
 798 **                      message priority).  This should not be set
 799 **                      when reading a queue file because some info
 800 **                      needed to compute the priority is wrong.
 801 **              log -- call logsender()?
 802 **
 803 **      Returns:
 804 **              none.
 805 **
 806 **      Side Effects:
 807 **              Sets a bunch of global variables from information
 808 **                      in the collected header.
 809 */
 810
 811 void
 812 eatheader(e, full, log)
 813         register ENVELOPE *e;
 814         bool full;
 815         bool log;
 816 {
 817         register HDR *h;
 818         register char *p;
 819         int hopcnt = 0;
 820         char buf[MAXLINE];
 821
 822         /*
 823         **  Set up macros for possible expansion in headers.
 824         */
 825
 826         macdefine(&e->e_macro, A_PERM, 'f', e->e_sender);
 827         macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
 828         if (e->e_origrcpt != NULL && *e->e_origrcpt != '\0')
 829                 macdefine(&e->e_macro, A_PERM, 'u', e->e_origrcpt);
 830         else
 831                 macdefine(&e->e_macro, A_PERM, 'u', NULL);
 832
 833         /* full name of from person */
 834         p = hvalue("full-name", e->e_header);
 835         if (p != NULL)
 836         {
 837                 if (!rfc822_string(p))
 838                 {
 839                         /*
 840                         **  Quote a full name with special characters
 841                         **  as a comment so crackaddr() doesn't destroy
 842                         **  the name portion of the address.
 843                         */
 844
 845                         p = addquotes(p, e->e_rpool);
 846                 }
 847                 macdefine(&e->e_macro, A_PERM, 'x', p);
 848         }
 849
 850         if (tTd(32, 1))
 851                 sm_dprintf("----- collected header -----\n");
 852         e->e_msgid = NULL;
 853         for (h = e->e_header; h != NULL; h = h->h_link)
 854         {
 855                 if (tTd(32, 1))
 856                         sm_dprintf("%s:", h->h_field);
 857                 if (h->h_value == NULL)
 858                 {
 859                         if (tTd(32, 1))
 860                                 sm_dprintf("<NULL>\n");
 861                         continue;
 862                 }
 863
 864                 /* do early binding */
 865                 if (bitset(H_DEFAULT, h->h_flags) &&
 866                     !bitset(H_BINDLATE, h->h_flags))
 867                 {
 868                         if (tTd(32, 1))
 869                         {
 870                                 sm_dprintf("(");
 871                                 xputs(sm_debug_file(), h->h_value);
 872                                 sm_dprintf(") ");
 873                         }
 874                         expand(h->h_value, buf, sizeof(buf), e);
 875                         if (buf[0] != '\0' &&
 876                             (buf[0] != ' ' || buf[1] != '\0'))
 877                         {
 878                                 if (bitset(H_FROM, h->h_flags))
 879                                         expand(crackaddr(buf, e),
 880                                                buf, sizeof(buf), e);
 881                                 h->h_value = sm_rpool_strdup_x(e->e_rpool, buf);
 882                                 h->h_flags &= ~H_DEFAULT;
 883                         }
 884                 }
 885                 if (tTd(32, 1))
 886                 {
 887                         xputs(sm_debug_file(), h->h_value);
 888                         sm_dprintf("\n");
 889                 }
 890
 891                 /* count the number of times it has been processed */
 892                 if (bitset(H_TRACE, h->h_flags))
 893                         hopcnt++;
 894
 895                 /* send to this person if we so desire */
 896                 if (GrabTo && bitset(H_RCPT, h->h_flags) &&
 897                     !bitset(H_DEFAULT, h->h_flags) &&
 898                     (!bitset(EF_RESENT, e->e_flags) ||
 899                      bitset(H_RESENT, h->h_flags)))
 900                 {
 901 #if 0
 902                         int saveflags = e->e_flags;
 903 #endif
 904
 905                         (void) sendtolist(denlstring(h->h_value, true, false),
 906                                           NULLADDR, &e->e_sendqueue, 0, e);
 907
 908 #if 0
 909                         /*
 910                         **  Change functionality so a fatal error on an
 911                         **  address doesn't affect the entire envelope.
 912                         */
 913
 914                         /* delete fatal errors generated by this address */
 915                         if (!bitset(EF_FATALERRS, saveflags))
 916                                 e->e_flags &= ~EF_FATALERRS;
 917 #endif /* 0 */
 918                 }
 919
 920                 /* save the message-id for logging */
 921                 p = "resent-message-id";
 922                 if (!bitset(EF_RESENT, e->e_flags))
 923                         p += 7;
 924                 if (sm_strcasecmp(h->h_field, p) == 0)
 925                 {
 926                         e->e_msgid = h->h_value;
 927                         while (isascii(*e->e_msgid) && isspace(*e->e_msgid))
 928                                 e->e_msgid++;
 929                         macdefine(&e->e_macro, A_PERM, macid("{msg_id}"),
 930                                   e->e_msgid);
 931                 }
 932         }
 933         if (tTd(32, 1))
 934                 sm_dprintf("----------------------------\n");
 935
 936         /* if we are just verifying (that is, sendmail -t -bv), drop out now */
 937         if (OpMode == MD_VERIFY)
 938                 return;
 939
 940         /* store hop count */
 941         if (hopcnt > e->e_hopcount)
 942         {
 943                 e->e_hopcount = hopcnt;
 944                 (void) sm_snprintf(buf, sizeof(buf), "%d", e->e_hopcount);
 945                 macdefine(&e->e_macro, A_TEMP, 'c', buf);
 946         }
 947
 948         /* message priority */
 949         p = hvalue("precedence", e->e_header);
 950         if (p != NULL)
 951                 e->e_class = priencode(p);
 952         if (e->e_class < 0)
 953                 e->e_timeoutclass = TOC_NONURGENT;
 954         else if (e->e_class > 0)
 955                 e->e_timeoutclass = TOC_URGENT;
 956         if (full)
 957         {
 958                 e->e_msgpriority = e->e_msgsize
 959                                  - e->e_class * WkClassFact
 960                                  + e->e_nrcpts * WkRecipFact;
 961         }
 962
 963         /* check for DSN to properly set e_timeoutclass */
 964         p = hvalue("content-type", e->e_header);
 965         if (p != NULL)
 966         {
 967                 bool oldsupr;
 968                 char **pvp;
 969                 char pvpbuf[MAXLINE];
 970                 extern unsigned char MimeTokenTab[256];
 971
 972                 /* tokenize header */
 973                 oldsupr = SuprErrs;
 974                 SuprErrs = true;
 975                 pvp = prescan(p, '\0', pvpbuf, sizeof(pvpbuf), NULL,
 976                               MimeTokenTab, false);
 977                 SuprErrs = oldsupr;
 978
 979                 /* Check if multipart/report */
 980                 if (pvp != NULL && pvp[0] != NULL &&
 981                     pvp[1] != NULL && pvp[2] != NULL &&
 982                     sm_strcasecmp(*pvp++, "multipart") == 0 &&
 983                     strcmp(*pvp++, "/") == 0 &&
 984                     sm_strcasecmp(*pvp++, "report") == 0)
 985                 {
 986                         /* Look for report-type=delivery-status */
 987                         while (*pvp != NULL)
 988                         {
 989                                 /* skip to semicolon separator */
 990                                 while (*pvp != NULL && strcmp(*pvp, ";") != 0)
 991                                         pvp++;
 992
 993                                 /* skip semicolon */
 994                                 if (*pvp++ == NULL || *pvp == NULL)
 995                                         break;
 996
 997                                 /* look for report-type */
 998                                 if (sm_strcasecmp(*pvp++, "report-type") != 0)
 999                                         continue;
1000
1001                                 /* skip equal */
1002                                 if (*pvp == NULL || strcmp(*pvp, "=") != 0)
1003                                         continue;
1004
1005                                 /* check value */
1006                                 if (*++pvp != NULL &&
1007                                     sm_strcasecmp(*pvp,
1008                                                   "delivery-status") == 0)
1009                                         e->e_timeoutclass = TOC_DSN;
1010
1011                                 /* found report-type, no need to continue */
1012                                 break;
1013                         }
1014                 }
1015         }
1016
1017         /* message timeout priority */
1018         p = hvalue("priority", e->e_header);
1019         if (p != NULL)
1020         {
1021                 /* (this should be in the configuration file) */
1022                 if (sm_strcasecmp(p, "urgent") == 0)
1023                         e->e_timeoutclass = TOC_URGENT;
1024                 else if (sm_strcasecmp(p, "normal") == 0)
1025                         e->e_timeoutclass = TOC_NORMAL;
1026                 else if (sm_strcasecmp(p, "non-urgent") == 0)
1027                         e->e_timeoutclass = TOC_NONURGENT;
1028                 else if (bitset(EF_RESPONSE, e->e_flags))
1029                         e->e_timeoutclass = TOC_DSN;
1030         }
1031         else if (bitset(EF_RESPONSE, e->e_flags))
1032                 e->e_timeoutclass = TOC_DSN;
1033
1034         /* date message originated */
1035         p = hvalue("posted-date", e->e_header);
1036         if (p == NULL)
1037                 p = hvalue("date", e->e_header);
1038         if (p != NULL)
1039                 macdefine(&e->e_macro, A_PERM, 'a', p);
1040
1041         /* check to see if this is a MIME message */
1042         if ((e->e_bodytype != NULL &&
1043              sm_strcasecmp(e->e_bodytype, "8BITMIME") == 0) ||
1044             hvalue("MIME-Version", e->e_header) != NULL)
1045         {
1046                 e->e_flags |= EF_IS_MIME;
1047                 if (HasEightBits)
1048                         e->e_bodytype = "8BITMIME";
1049         }
1050         else if ((p = hvalue("Content-Type", e->e_header)) != NULL)
1051         {
1052                 /* this may be an RFC 1049 message */
1053                 p = strpbrk(p, ";/");
1054                 if (p == NULL || *p == ';')
1055                 {
1056                         /* yep, it is */
1057                         e->e_flags |= EF_DONT_MIME;
1058                 }
1059         }
1060
1061         /*
1062         **  From person in antiquated ARPANET mode
1063         **      required by UK Grey Book e-mail gateways (sigh)
1064         */
1065
1066         if (OpMode == MD_ARPAFTP)
1067         {
1068                 register struct hdrinfo *hi;
1069
1070                 for (hi = HdrInfo; hi->hi_field != NULL; hi++)
1071                 {
1072                         if (bitset(H_FROM, hi->hi_flags) &&
1073                             (!bitset(H_RESENT, hi->hi_flags) ||
1074                              bitset(EF_RESENT, e->e_flags)) &&
1075                             (p = hvalue(hi->hi_field, e->e_header)) != NULL)
1076                                 break;
1077                 }
1078                 if (hi->hi_field != NULL)
1079                 {
1080                         if (tTd(32, 2))
1081                                 sm_dprintf("eatheader: setsender(*%s == %s)\n",
1082                                         hi->hi_field, p);
1083                         setsender(p, e, NULL, '\0', true);
1084                 }
1085         }
1086
1087         /*
1088         **  Log collection information.
1089         */
1090
1091         if (tTd(92, 2))
1092                 sm_dprintf("eatheader: e_id=%s, EF_LOGSENDER=%d, LogLevel=%d, log=%d\n",
1093                         e->e_id, bitset(EF_LOGSENDER, e->e_flags), LogLevel,
1094                         log);
1095         if (log && bitset(EF_LOGSENDER, e->e_flags) && LogLevel > 4)
1096         {
1097                 logsender(e, e->e_msgid);
1098                 e->e_flags &= ~EF_LOGSENDER;
1099         }
1100 }
1101
1102 /*
1103 **  LOGSENDER -- log sender information
1104 **
1105 **      Parameters:
1106 **              e -- the envelope to log
1107 **              msgid -- the message id
1108 **
1109 **      Returns:
1110 **              none
1111 */
1112
1113 void
1114 logsender(e, msgid)
1115         register ENVELOPE *e;
1116         char *msgid;
1117 {
1118         char *name;
1119         register char *sbp;
1120         register char *p;
1121         char hbuf[MAXNAME + 1];
1122         char sbuf[MAXLINE + 1]; /* XREF: see below MSGIDLOGLEN */
1123
1124         if (bitset(EF_RESPONSE, e->e_flags))
1125                 name = "[RESPONSE]";
1126         else if ((name = macvalue('_', e)) != NULL)
1127                 /* EMPTY */
1128                 ;
1129         else if (RealHostName == NULL)
1130                 name = "localhost";
1131         else if (RealHostName[0] == '[')
1132                 name = RealHostName;
1133         else
1134         {
1135                 name = hbuf;
1136                 (void) sm_snprintf(hbuf, sizeof(hbuf), "%.80s", RealHostName);
1137                 if (RealHostAddr.sa.sa_family != 0)
1138                 {
1139                         p = &hbuf[strlen(hbuf)];
1140                         (void) sm_snprintf(p, SPACELEFT(hbuf, p),
1141                                            " (%.100s)",
1142                                            anynet_ntoa(&RealHostAddr));
1143                 }
1144         }
1145
1146 #if (SYSLOG_BUFSIZE) >= 256
1147         sbp = sbuf;
1148         (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1149                 "from=%.200s, size=%ld, class=%d, nrcpts=%d",
1150                 e->e_from.q_paddr == NULL ? "<NONE>" : e->e_from.q_paddr,
1151                 PRT_NONNEGL(e->e_msgsize), e->e_class, e->e_nrcpts);
1152         sbp += strlen(sbp);
1153         if (msgid != NULL)
1154         {
1155
1156 #ifndef MSGIDLOGLEN
1157 # define MSGIDLOGLEN 100
1158 # define FIRSTLOGLEN 850
1159 # else
1160 #  if MSGIDLOGLEN < 100
1161     ERROR MSGIDLOGLEN too short
1162 #  endif
1163 /* XREF: this is "sizeof(sbuf)", see above */
1164 #  if MSGIDLOGLEN >= MAXLINE / 2
1165     ERROR MSGIDLOGLEN too long
1166 #  endif
1167
1168 /* 850 - 100 for original MSGIDLOGLEN */
1169 #  define FIRSTLOGLEN (750 + MSGIDLOGLEN)
1170
1171 /* check that total length is ok */
1172 #  if FIRSTLOGLEN + 200 >= MAXLINE
1173     ERROR MSGIDLOGLEN too long
1174 #  endif
1175 #endif
1176                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1177                                 ", msgid=%.*s", MSGIDLOGLEN, msgid);
1178                 sbp += strlen(sbp);
1179         }
1180         if (e->e_bodytype != NULL)
1181         {
1182                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1183                                 ", bodytype=%.20s", e->e_bodytype);
1184                 sbp += strlen(sbp);
1185         }
1186         p = macvalue('r', e);
1187         if (p != NULL)
1188         {
1189                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1190                                 ", proto=%.20s", p);
1191                 sbp += strlen(sbp);
1192         }
1193         p = macvalue(macid("{daemon_name}"), e);
1194         if (p != NULL)
1195         {
1196                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1197                                 ", daemon=%.20s", p);
1198                 sbp += strlen(sbp);
1199         }
1200 # if _FFR_LOG_MORE1
1201         LOG_MORE(sbuf, sbp);
1202 #  if SASL
1203         p = macvalue(macid("{auth_type}"), e);
1204         if (p == NULL || *p == '\0')
1205                 p = "NONE";
1206         (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp), ", auth=%.20s", p);
1207         sbp += strlen(sbp);
1208 #  endif /* SASL */
1209 # endif /* _FFR_LOG_MORE1 */
1210         sm_syslog(LOG_INFO, e->e_id, "%.*s, relay=%s", FIRSTLOGLEN, sbuf, name);
1211
1212 #else /* (SYSLOG_BUFSIZE) >= 256 */
1213
1214         sm_syslog(LOG_INFO, e->e_id,
1215                   "from=%s",
1216                   e->e_from.q_paddr == NULL ? "<NONE>"
1217                                             : shortenstring(e->e_from.q_paddr,
1218                                                             83));
1219         sm_syslog(LOG_INFO, e->e_id,
1220                   "size=%ld, class=%ld, nrcpts=%d",
1221                   PRT_NONNEGL(e->e_msgsize), e->e_class, e->e_nrcpts);
1222         if (msgid != NULL)
1223                 sm_syslog(LOG_INFO, e->e_id,
1224                           "msgid=%s",
1225                           shortenstring(msgid, 83));
1226         sbp = sbuf;
1227         *sbp = '\0';
1228         if (e->e_bodytype != NULL)
1229         {
1230                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1231                                 "bodytype=%.20s, ", e->e_bodytype);
1232                 sbp += strlen(sbp);
1233         }
1234         p = macvalue('r', e);
1235         if (p != NULL)
1236         {
1237                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1238                                 "proto=%.20s, ", p);
1239                 sbp += strlen(sbp);
1240         }
1241         sm_syslog(LOG_INFO, e->e_id,
1242                   "%.400srelay=%s", sbuf, name);
1243 #endif /* (SYSLOG_BUFSIZE) >= 256 */
1244 }
1245
1246 /*
1247 **  PRIENCODE -- encode external priority names into internal values.
1248 **
1249 **      Parameters:
1250 **              p -- priority in ascii.
1251 **
1252 **      Returns:
1253 **              priority as a numeric level.
1254 **
1255 **      Side Effects:
1256 **              none.
1257 */
1258
1259 static int
1260 priencode(p)
1261         char *p;
1262 {
1263         register int i;
1264
1265         for (i = 0; i < NumPriorities; i++)
1266         {
1267                 if (sm_strcasecmp(p, Priorities[i].pri_name) == 0)
1268                         return Priorities[i].pri_val;
1269         }
1270
1271         /* unknown priority */
1272         return 0;
1273 }
1274
1275 /*
1276 **  CRACKADDR -- parse an address and turn it into a macro
1277 **
1278 **      This doesn't actually parse the address -- it just extracts
1279 **      it and replaces it with "$g".  The parse is totally ad hoc
1280 **      and isn't even guaranteed to leave something syntactically
1281 **      identical to what it started with.  However, it does leave
1282 **      something semantically identical if possible, else at least
1283 **      syntactically correct.
1284 **
1285 **      For example, it changes "Real Name <real@example.com> (Comment)"
1286 **      to "Real Name <$g> (Comment)".
1287 **
1288 **      This algorithm has been cleaned up to handle a wider range
1289 **      of cases -- notably quoted and backslash escaped strings.
1290 **      This modification makes it substantially better at preserving
1291 **      the original syntax.
1292 **
1293 **      Parameters:
1294 **              addr -- the address to be cracked.
1295 **              e -- the current envelope.
1296 **
1297 **      Returns:
1298 **              a pointer to the new version.
1299 **
1300 **      Side Effects:
1301 **              none.
1302 **
1303 **      Warning:
1304 **              The return value is saved in local storage and should
1305 **              be copied if it is to be reused.
1306 */
1307
1308 #define SM_HAVE_ROOM            ((bp < buflim) && (buflim <= bufend))
1309
1310 /*
1311 **  Append a character to bp if we have room.
1312 **  If not, punt and return $g.
1313 */
1314
1315 #define SM_APPEND_CHAR(c)                                       \
1316         do                                                      \
1317         {                                                       \
1318                 if (SM_HAVE_ROOM)                               \
1319                         *bp++ = (c);                            \
1320                 else                                            \
1321                         goto returng;                           \
1322         } while (0)
1323
1324 #if MAXNAME < 10
1325 ERROR MAXNAME must be at least 10
1326 #endif
1327
1328 char *
1329 crackaddr(addr, e)
1330         register char *addr;
1331         ENVELOPE *e;
1332 {
1333         register char *p;
1334         register char c;
1335         int cmtlev;                     /* comment level in input string */
1336         int realcmtlev;                 /* comment level in output string */
1337         int anglelev;                   /* angle level in input string */
1338         int copylev;                    /* 0 == in address, >0 copying */
1339         int bracklev;                   /* bracket level for IPv6 addr check */
1340         bool addangle;                  /* put closing angle in output */
1341         bool qmode;                     /* quoting in original string? */
1342         bool realqmode;                 /* quoting in output string? */
1343         bool putgmac = false;           /* already wrote $g */
1344         bool quoteit = false;           /* need to quote next character */
1345         bool gotangle = false;          /* found first '<' */
1346         bool gotcolon = false;          /* found a ':' */
1347         register char *bp;
1348         char *buflim;
1349         char *bufhead;
1350         char *addrhead;
1351         char *bufend;
1352         static char buf[MAXNAME + 1];
1353
1354         if (tTd(33, 1))
1355                 sm_dprintf("crackaddr(%s)\n", addr);
1356
1357         buflim = bufend = &buf[sizeof(buf) - 1];
1358         bp = bufhead = buf;
1359
1360         /* skip over leading spaces but preserve them */
1361         while (*addr != '\0' && SM_ISSPACE(*addr))
1362         {
1363                 SM_APPEND_CHAR(*addr);
1364                 addr++;
1365         }
1366         bufhead = bp;
1367
1368         /*
1369         **  Start by assuming we have no angle brackets.  This will be
1370         **  adjusted later if we find them.
1371         */
1372
1373         p = addrhead = addr;
1374         copylev = anglelev = cmtlev = realcmtlev = 0;
1375         bracklev = 0;
1376         qmode = realqmode = addangle = false;
1377
1378         while ((c = *p++) != '\0')
1379         {
1380                 /*
1381                 **  Try to keep legal syntax using spare buffer space
1382                 **  (maintained by buflim).
1383                 */
1384
1385                 if (copylev > 0)
1386                         SM_APPEND_CHAR(c);
1387
1388                 /* check for backslash escapes */
1389                 if (c == '\\')
1390                 {
1391                         /* arrange to quote the address */
1392                         if (cmtlev <= 0 && !qmode)
1393                                 quoteit = true;
1394
1395                         if ((c = *p++) == '\0')
1396                         {
1397                                 /* too far */
1398                                 p--;
1399                                 goto putg;
1400                         }
1401                         if (copylev > 0)
1402                                 SM_APPEND_CHAR(c);
1403                         goto putg;
1404                 }
1405
1406                 /* check for quoted strings */
1407                 if (c == '"' && cmtlev <= 0)
1408                 {
1409                         qmode = !qmode;
1410                         if (copylev > 0 && SM_HAVE_ROOM)
1411                         {
1412                                 if (realqmode)
1413                                         buflim--;
1414                                 else
1415                                         buflim++;
1416                                 realqmode = !realqmode;
1417                         }
1418                         continue;
1419                 }
1420                 if (qmode)
1421                         goto putg;
1422
1423                 /* check for comments */
1424                 if (c == '(')
1425                 {
1426                         cmtlev++;
1427
1428                         /* allow space for closing paren */
1429                         if (SM_HAVE_ROOM)
1430                         {
1431                                 buflim--;
1432                                 realcmtlev++;
1433                                 if (copylev++ <= 0)
1434                                 {
1435                                         if (bp != bufhead)
1436                                                 SM_APPEND_CHAR(' ');
1437                                         SM_APPEND_CHAR(c);
1438                                 }
1439                         }
1440                 }
1441                 if (cmtlev > 0)
1442                 {
1443                         if (c == ')')
1444                         {
1445                                 cmtlev--;
1446                                 copylev--;
1447                                 if (SM_HAVE_ROOM)
1448                                 {
1449                                         realcmtlev--;
1450                                         buflim++;
1451                                 }
1452                         }
1453                         continue;
1454                 }
1455                 else if (c == ')')
1456                 {
1457                         /* syntax error: unmatched ) */
1458                         if (copylev > 0 && SM_HAVE_ROOM && bp > bufhead)
1459                                 bp--;
1460                 }
1461
1462                 /* count nesting on [ ... ] (for IPv6 domain literals) */
1463                 if (c == '[')
1464                         bracklev++;
1465                 else if (c == ']')
1466                         bracklev--;
1467
1468                 /* check for group: list; syntax */
1469                 if (c == ':' && anglelev <= 0 && bracklev <= 0 &&
1470                     !gotcolon && !ColonOkInAddr)
1471                 {
1472                         register char *q;
1473
1474                         /*
1475                         **  Check for DECnet phase IV ``::'' (host::user)
1476                         **  or DECnet phase V ``:.'' syntaxes.  The latter
1477                         **  covers ``user@DEC:.tay.myhost'' and
1478                         **  ``DEC:.tay.myhost::user'' syntaxes (bletch).
1479                         */
1480
1481                         if (*p == ':' || *p == '.')
1482                         {
1483                                 if (cmtlev <= 0 && !qmode)
1484                                         quoteit = true;
1485                                 if (copylev > 0)
1486                                 {
1487                                         SM_APPEND_CHAR(c);
1488                                         SM_APPEND_CHAR(*p);
1489                                 }
1490                                 p++;
1491                                 goto putg;
1492                         }
1493
1494                         gotcolon = true;
1495
1496                         bp = bufhead;
1497                         if (quoteit)
1498                         {
1499                                 SM_APPEND_CHAR('"');
1500
1501                                 /* back up over the ':' and any spaces */
1502                                 --p;
1503                                 while (p > addr &&
1504                                        isascii(*--p) && isspace(*p))
1505                                         continue;
1506                                 p++;
1507                         }
1508                         for (q = addrhead; q < p; )
1509                         {
1510                                 c = *q++;
1511                                 if (quoteit && c == '"')
1512                                         SM_APPEND_CHAR('\\');
1513                                 SM_APPEND_CHAR(c);
1514                         }
1515                         if (quoteit)
1516                         {
1517                                 if (bp == &bufhead[1])
1518                                         bp--;
1519                                 else
1520                                         SM_APPEND_CHAR('"');
1521                                 while ((c = *p++) != ':')
1522                                         SM_APPEND_CHAR(c);
1523                                 SM_APPEND_CHAR(c);
1524                         }
1525
1526                         /* any trailing white space is part of group: */
1527                         while (SM_ISSPACE(*p))
1528                         {
1529                                 SM_APPEND_CHAR(*p);
1530                                 p++;
1531                         }
1532                         copylev = 0;
1533                         putgmac = quoteit = false;
1534                         bufhead = bp;
1535                         addrhead = p;
1536                         continue;
1537                 }
1538
1539                 if (c == ';' && copylev <= 0 && !ColonOkInAddr)
1540                         SM_APPEND_CHAR(c);
1541
1542                 /* check for characters that may have to be quoted */
1543                 if (strchr(MustQuoteChars, c) != NULL)
1544                 {
1545                         /*
1546                         **  If these occur as the phrase part of a <>
1547                         **  construct, but are not inside of () or already
1548                         **  quoted, they will have to be quoted.  Note that
1549                         **  now (but don't actually do the quoting).
1550                         */
1551
1552                         if (cmtlev <= 0 && !qmode)
1553                                 quoteit = true;
1554                 }
1555
1556                 /* check for angle brackets */
1557                 if (c == '<')
1558                 {
1559                         register char *q;
1560
1561                         /* assume first of two angles is bogus */
1562                         if (gotangle)
1563                                 quoteit = true;
1564                         gotangle = true;
1565
1566                         /* oops -- have to change our mind */
1567                         anglelev = 1;
1568                         if (SM_HAVE_ROOM)
1569                         {
1570                                 if (!addangle)
1571                                         buflim--;
1572                                 addangle = true;
1573                         }
1574
1575                         bp = bufhead;
1576                         if (quoteit)
1577                         {
1578                                 SM_APPEND_CHAR('"');
1579
1580                                 /* back up over the '<' and any spaces */
1581                                 --p;
1582                                 while (p > addr &&
1583                                        isascii(*--p) && isspace(*p))
1584                                         continue;
1585                                 p++;
1586                         }
1587                         for (q = addrhead; q < p; )
1588                         {
1589                                 c = *q++;
1590                                 if (quoteit && c == '"')
1591                                 {
1592                                         SM_APPEND_CHAR('\\');
1593                                         SM_APPEND_CHAR(c);
1594                                 }
1595                                 else
1596                                         SM_APPEND_CHAR(c);
1597                         }
1598                         if (quoteit)
1599                         {
1600                                 if (bp == &buf[1])
1601                                         bp--;
1602                                 else
1603                                         SM_APPEND_CHAR('"');
1604                                 while ((c = *p++) != '<')
1605                                         SM_APPEND_CHAR(c);
1606                                 SM_APPEND_CHAR(c);
1607                         }
1608                         copylev = 0;
1609                         putgmac = quoteit = false;
1610                         continue;
1611                 }
1612
1613                 if (c == '>')
1614                 {
1615                         if (anglelev > 0)
1616                         {
1617                                 anglelev--;
1618                                 if (SM_HAVE_ROOM)
1619                                 {
1620                                         if (addangle)
1621                                                 buflim++;
1622                                         addangle = false;
1623                                 }
1624                         }
1625                         else if (SM_HAVE_ROOM)
1626                         {
1627                                 /* syntax error: unmatched > */
1628                                 if (copylev > 0 && bp > bufhead)
1629                                         bp--;
1630                                 quoteit = true;
1631                                 continue;
1632                         }
1633                         if (copylev++ <= 0)
1634                                 SM_APPEND_CHAR(c);
1635                         continue;
1636                 }
1637
1638                 /* must be a real address character */
1639         putg:
1640                 if (copylev <= 0 && !putgmac)
1641                 {
1642                         if (bp > buf && bp[-1] == ')')
1643                                 SM_APPEND_CHAR(' ');
1644                         SM_APPEND_CHAR(MACROEXPAND);
1645                         SM_APPEND_CHAR('g');
1646                         putgmac = true;
1647                 }
1648         }
1649
1650         /* repair any syntactic damage */
1651         if (realqmode && bp < bufend)
1652                 *bp++ = '"';
1653         while (realcmtlev-- > 0 && bp < bufend)
1654                 *bp++ = ')';
1655         if (addangle && bp < bufend)
1656                 *bp++ = '>';
1657         *bp = '\0';
1658         if (bp < bufend)
1659                 goto success;
1660
1661  returng:
1662         /* String too long, punt */
1663         buf[0] = '<';
1664         buf[1] = MACROEXPAND;
1665         buf[2]= 'g';
1666         buf[3] = '>';
1667         buf[4]= '\0';
1668         sm_syslog(LOG_ALERT, e->e_id,
1669                   "Dropped invalid comments from header address");
1670
1671  success:
1672         if (tTd(33, 1))
1673         {
1674                 sm_dprintf("crackaddr=>`");
1675                 xputs(sm_debug_file(), buf);
1676                 sm_dprintf("'\n");
1677         }
1678         return buf;
1679 }
1680
1681 /*
1682 **  PUTHEADER -- put the header part of a message from the in-core copy
1683 **
1684 **      Parameters:
1685 **              mci -- the connection information.
1686 **              hdr -- the header to put.
1687 **              e -- envelope to use.
1688 **              flags -- MIME conversion flags.
1689 **
1690 **      Returns:
1691 **              true iff header part was written successfully
1692 **
1693 **      Side Effects:
1694 **              none.
1695 */
1696
1697 bool
1698 putheader(mci, hdr, e, flags)
1699         register MCI *mci;
1700         HDR *hdr;
1701         register ENVELOPE *e;
1702         int flags;
1703 {
1704         register HDR *h;
1705         char buf[SM_MAX(MAXLINE,BUFSIZ)];
1706         char obuf[MAXLINE];
1707
1708         if (tTd(34, 1))
1709                 sm_dprintf("--- putheader, mailer = %s ---\n",
1710                         mci->mci_mailer->m_name);
1711
1712         /*
1713         **  If we're in MIME mode, we're not really in the header of the
1714         **  message, just the header of one of the parts of the body of
1715         **  the message.  Therefore MCIF_INHEADER should not be turned on.
1716         */
1717
1718         if (!bitset(MCIF_INMIME, mci->mci_flags))
1719                 mci->mci_flags |= MCIF_INHEADER;
1720
1721         for (h = hdr; h != NULL; h = h->h_link)
1722         {
1723                 register char *p = h->h_value;
1724                 char *q;
1725
1726                 if (tTd(34, 11))
1727                 {
1728                         sm_dprintf("  %s:", h->h_field);
1729                         xputs(sm_debug_file(), p);
1730                 }
1731
1732                 /* Skip empty headers */
1733                 if (h->h_value == NULL)
1734                         continue;
1735
1736                 /* heuristic shortening of MIME fields to avoid MUA overflows */
1737                 if (MaxMimeFieldLength > 0 &&
1738                     wordinclass(h->h_field,
1739                                 macid("{checkMIMEFieldHeaders}")))
1740                 {
1741                         size_t len;
1742
1743                         len = fix_mime_header(h, e);
1744                         if (len > 0)
1745                         {
1746                                 sm_syslog(LOG_ALERT, e->e_id,
1747                                           "Truncated MIME %s header due to field size (length = %ld) (possible attack)",
1748                                           h->h_field, (unsigned long) len);
1749                                 if (tTd(34, 11))
1750                                         sm_dprintf("  truncated MIME %s header due to field size  (length = %ld) (possible attack)\n",
1751                                                    h->h_field,
1752                                                    (unsigned long) len);
1753                         }
1754                 }
1755
1756                 if (MaxMimeHeaderLength > 0 &&
1757                     wordinclass(h->h_field,
1758                                 macid("{checkMIMETextHeaders}")))
1759                 {
1760                         size_t len;
1761
1762                         len = strlen(h->h_value);
1763                         if (len > (size_t) MaxMimeHeaderLength)
1764                         {
1765                                 h->h_value[MaxMimeHeaderLength - 1] = '\0';
1766                                 sm_syslog(LOG_ALERT, e->e_id,
1767                                           "Truncated long MIME %s header (length = %ld) (possible attack)",
1768                                           h->h_field, (unsigned long) len);
1769                                 if (tTd(34, 11))
1770                                         sm_dprintf("  truncated long MIME %s header (length = %ld) (possible attack)\n",
1771                                                    h->h_field,
1772                                                    (unsigned long) len);
1773                         }
1774                 }
1775
1776                 if (MaxMimeHeaderLength > 0 &&
1777                     wordinclass(h->h_field,
1778                                 macid("{checkMIMEHeaders}")))
1779                 {
1780                         size_t len;
1781
1782                         len = strlen(h->h_value);
1783                         if (shorten_rfc822_string(h->h_value,
1784                                                   MaxMimeHeaderLength))
1785                         {
1786                                 if (len < MaxMimeHeaderLength)
1787                                 {
1788                                         /* we only rebalanced a bogus header */
1789                                         sm_syslog(LOG_ALERT, e->e_id,
1790                                                   "Fixed MIME %s header (possible attack)",
1791                                                   h->h_field);
1792                                         if (tTd(34, 11))
1793                                                 sm_dprintf("  fixed MIME %s header (possible attack)\n",
1794                                                            h->h_field);
1795                                 }
1796                                 else
1797                                 {
1798                                         /* we actually shortened header */
1799                                         sm_syslog(LOG_ALERT, e->e_id,
1800                                                   "Truncated long MIME %s header (length = %ld) (possible attack)",
1801                                                   h->h_field,
1802                                                   (unsigned long) len);
1803                                         if (tTd(34, 11))
1804                                                 sm_dprintf("  truncated long MIME %s header (length = %ld) (possible attack)\n",
1805                                                            h->h_field,
1806                                                            (unsigned long) len);
1807                                 }
1808                         }
1809                 }
1810
1811                 /*
1812                 **  Suppress Content-Transfer-Encoding: if we are MIMEing
1813                 **  and we are potentially converting from 8 bit to 7 bit
1814                 **  MIME.  If converting, add a new CTE header in
1815                 **  mime8to7().
1816                 */
1817
1818                 if (bitset(H_CTE, h->h_flags) &&
1819                     bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME,
1820                            mci->mci_flags) &&
1821                     !bitset(M87F_NO8TO7, flags))
1822                 {
1823                         if (tTd(34, 11))
1824                                 sm_dprintf(" (skipped (content-transfer-encoding))\n");
1825                         continue;
1826                 }
1827
1828                 if (bitset(MCIF_INMIME, mci->mci_flags))
1829                 {
1830                         if (tTd(34, 11))
1831                                 sm_dprintf("\n");
1832                         if (!put_vanilla_header(h, p, mci))
1833                                 goto writeerr;
1834                         continue;
1835                 }
1836
1837                 if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
1838                     !bitintersect(h->h_mflags, mci->mci_mailer->m_flags) &&
1839                     (h->h_macro == '\0' ||
1840                      (q = macvalue(bitidx(h->h_macro), e)) == NULL ||
1841                      *q == '\0'))
1842                 {
1843                         if (tTd(34, 11))
1844                                 sm_dprintf(" (skipped)\n");
1845                         continue;
1846                 }
1847
1848                 /* handle Resent-... headers specially */
1849                 if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
1850                 {
1851                         if (tTd(34, 11))
1852                                 sm_dprintf(" (skipped (resent))\n");
1853                         continue;
1854                 }
1855
1856                 /* suppress return receipts if requested */
1857                 if (bitset(H_RECEIPTTO, h->h_flags) &&
1858                     (RrtImpliesDsn || bitset(EF_NORECEIPT, e->e_flags)))
1859                 {
1860                         if (tTd(34, 11))
1861                                 sm_dprintf(" (skipped (receipt))\n");
1862                         continue;
1863                 }
1864
1865                 /* macro expand value if generated internally */
1866                 if (bitset(H_DEFAULT, h->h_flags) ||
1867                     bitset(H_BINDLATE, h->h_flags))
1868                 {
1869                         expand(p, buf, sizeof(buf), e);
1870                         p = buf;
1871                         if (*p == '\0')
1872                         {
1873                                 if (tTd(34, 11))
1874                                         sm_dprintf(" (skipped -- null value)\n");
1875                                 continue;
1876                         }
1877                 }
1878
1879                 if (bitset(H_BCC, h->h_flags) && !KeepBcc)
1880                 {
1881                         /* Bcc: field -- either truncate or delete */
1882                         if (bitset(EF_DELETE_BCC, e->e_flags))
1883                         {
1884                                 if (tTd(34, 11))
1885                                         sm_dprintf(" (skipped -- bcc)\n");
1886                         }
1887                         else
1888                         {
1889                                 /* no other recipient headers: truncate value */
1890                                 (void) sm_strlcpyn(obuf, sizeof(obuf), 2,
1891                                                    h->h_field, ":");
1892                                 if (!putline(obuf, mci))
1893                                         goto writeerr;
1894                         }
1895                         continue;
1896                 }
1897
1898                 if (tTd(34, 11))
1899                         sm_dprintf("\n");
1900
1901                 if (bitset(H_FROM|H_RCPT, h->h_flags))
1902                 {
1903                         /* address field */
1904                         bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags);
1905
1906                         if (bitset(H_FROM, h->h_flags))
1907                                 oldstyle = false;
1908                         if (!commaize(h, p, oldstyle, mci, e,
1909                                       PXLF_HEADER | PXLF_STRIPMQUOTE)
1910                             && bitnset(M_xSMTP, mci->mci_mailer->m_flags))
1911                                 goto writeerr;
1912                 }
1913                 else
1914                 {
1915                         if (!put_vanilla_header(h, p, mci))
1916                                 goto writeerr;
1917                 }
1918         }
1919
1920         /*
1921         **  If we are converting this to a MIME message, add the
1922         **  MIME headers (but not in MIME mode!).
1923         */
1924
1925 #if MIME8TO7
1926         if (bitset(MM_MIME8BIT, MimeMode) &&
1927             bitset(EF_HAS8BIT, e->e_flags) &&
1928             !bitset(EF_DONT_MIME, e->e_flags) &&
1929             !bitnset(M_8BITS, mci->mci_mailer->m_flags) &&
1930             !bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME, mci->mci_flags) &&
1931             hvalue("MIME-Version", e->e_header) == NULL)
1932         {
1933                 if (!putline("MIME-Version: 1.0", mci))
1934                         goto writeerr;
1935                 if (hvalue("Content-Type", e->e_header) == NULL)
1936                 {
1937                         (void) sm_snprintf(obuf, sizeof(obuf),
1938                                         "Content-Type: text/plain; charset=%s",
1939                                         defcharset(e));
1940                         if (!putline(obuf, mci))
1941                                 goto writeerr;
1942                 }
1943                 if (hvalue("Content-Transfer-Encoding", e->e_header) == NULL
1944                     && !putline("Content-Transfer-Encoding: 8bit", mci))
1945                         goto writeerr;
1946         }
1947 #endif /* MIME8TO7 */
1948         return true;
1949
1950   writeerr:
1951         return false;
1952 }
1953
1954 /*
1955 **  PUT_VANILLA_HEADER -- output a fairly ordinary header
1956 **
1957 **      Parameters:
1958 **              h -- the structure describing this header
1959 **              v -- the value of this header
1960 **              mci -- the connection info for output
1961 **
1962 **      Returns:
1963 **              true iff header was written successfully
1964 */
1965
1966 static bool
1967 put_vanilla_header(h, v, mci)
1968         HDR *h;
1969         char *v;
1970         MCI *mci;
1971 {
1972         register char *nlp;
1973         register char *obp;
1974         int putflags;
1975         char obuf[MAXLINE + 256];       /* additional length for h_field */
1976
1977         putflags = PXLF_HEADER | PXLF_STRIPMQUOTE;
1978         if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
1979                 putflags |= PXLF_STRIP8BIT;
1980         (void) sm_snprintf(obuf, sizeof(obuf), "%.200s:", h->h_field);
1981         obp = obuf + strlen(obuf);
1982         while ((nlp = strchr(v, '\n')) != NULL)
1983         {
1984                 int l;
1985
1986                 l = nlp - v;
1987
1988                 /*
1989                 **  XXX This is broken for SPACELEFT()==0
1990                 **  However, SPACELEFT() is always > 0 unless MAXLINE==1.
1991                 */
1992
1993                 if (SPACELEFT(obuf, obp) - 1 < (size_t) l)
1994                         l = SPACELEFT(obuf, obp) - 1;
1995
1996                 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s", l, v);
1997                 if (!putxline(obuf, strlen(obuf), mci, putflags))
1998                         goto writeerr;
1999                 v += l + 1;
2000                 obp = obuf;
2001                 if (*v != ' ' && *v != '\t')
2002                         *obp++ = ' ';
2003         }
2004
2005         /* XXX This is broken for SPACELEFT()==0 */
2006         (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s",
2007                            (int) (SPACELEFT(obuf, obp) - 1), v);
2008         return putxline(obuf, strlen(obuf), mci, putflags);
2009
2010   writeerr:
2011         return false;
2012 }
2013
2014 /*
2015 **  COMMAIZE -- output a header field, making a comma-translated list.
2016 **
2017 **      Parameters:
2018 **              h -- the header field to output.
2019 **              p -- the value to put in it.
2020 **              oldstyle -- true if this is an old style header.
2021 **              mci -- the connection information.
2022 **              e -- the envelope containing the message.
2023 **              putflags -- flags for putxline()
2024 **
2025 **      Returns:
2026 **              true iff header field was written successfully
2027 **
2028 **      Side Effects:
2029 **              outputs "p" to "mci".
2030 */
2031
2032 bool
2033 commaize(h, p, oldstyle, mci, e, putflags)
2034         register HDR *h;
2035         register char *p;
2036         bool oldstyle;
2037         register MCI *mci;
2038         register ENVELOPE *e;
2039         int putflags;
2040 {
2041         register char *obp;
2042         int opos, omax, spaces;
2043         bool firstone = true;
2044         char **res;
2045         char obuf[MAXLINE + 3];
2046
2047         /*
2048         **  Output the address list translated by the
2049         **  mailer and with commas.
2050         */
2051
2052         if (tTd(14, 2))
2053                 sm_dprintf("commaize(%s:%s)\n", h->h_field, p);
2054
2055         if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
2056                 putflags |= PXLF_STRIP8BIT;
2057
2058         obp = obuf;
2059         (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.200s:", h->h_field);
2060         /* opos = strlen(obp); instead of the next 3 lines? */
2061         opos = strlen(h->h_field) + 1;
2062         if (opos > 201)
2063                 opos = 201;
2064         obp += opos;
2065
2066         spaces = 0;
2067         while (*p != '\0' && SM_ISSPACE(*p))
2068         {
2069                 ++spaces;
2070                 ++p;
2071         }
2072         if (spaces > 0)
2073         {
2074                 SM_ASSERT(sizeof(obuf) > opos  * 2);
2075
2076                 /*
2077                 **  Restrict number of spaces to half the length of buffer
2078                 **  so the header field body can be put in here too.
2079                 **  Note: this is a hack...
2080                 */
2081
2082                 if (spaces > sizeof(obuf) / 2)
2083                         spaces = sizeof(obuf) / 2;
2084                 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%*s", spaces,
2085                                 "");
2086                 opos += spaces;
2087                 obp += spaces;
2088                 SM_ASSERT(obp < &obuf[MAXLINE]);
2089         }
2090
2091         omax = mci->mci_mailer->m_linelimit - 2;
2092         if (omax < 0 || omax > 78)
2093                 omax = 78;
2094
2095         /*
2096         **  Run through the list of values.
2097         */
2098
2099         while (*p != '\0')
2100         {
2101                 register char *name;
2102                 register int c;
2103                 char savechar;
2104                 int flags;
2105                 auto int status;
2106
2107                 /*
2108                 **  Find the end of the name.  New style names
2109                 **  end with a comma, old style names end with
2110                 **  a space character.  However, spaces do not
2111                 **  necessarily delimit an old-style name -- at
2112                 **  signs mean keep going.
2113                 */
2114
2115                 /* find end of name */
2116                 while ((SM_ISSPACE(*p)) || *p == ',')
2117                         p++;
2118                 name = p;
2119                 res = NULL;
2120                 for (;;)
2121                 {
2122                         auto char *oldp;
2123                         char pvpbuf[PSBUFSIZE];
2124
2125                         res = prescan(p, oldstyle ? ' ' : ',', pvpbuf,
2126                                       sizeof(pvpbuf), &oldp, ExtTokenTab, false);
2127                         p = oldp;
2128 #if _FFR_IGNORE_BOGUS_ADDR
2129                         /* ignore addresses that can't be parsed */
2130                         if (res == NULL)
2131                         {
2132                                 name = p;
2133                                 continue;
2134                         }
2135 #endif /* _FFR_IGNORE_BOGUS_ADDR */
2136
2137                         /* look to see if we have an at sign */
2138                         while (*p != '\0' && SM_ISSPACE(*p))
2139                                 p++;
2140
2141                         if (*p != '@')
2142                         {
2143                                 p = oldp;
2144                                 break;
2145                         }
2146                         ++p;
2147                         while (*p != '\0' && SM_ISSPACE(*p))
2148                                 p++;
2149                 }
2150                 /* at the end of one complete name */
2151
2152                 /* strip off trailing white space */
2153                 while (p >= name &&
2154                        ((SM_ISSPACE(*p)) || *p == ',' || *p == '\0'))
2155                         p--;
2156                 if (++p == name)
2157                         continue;
2158
2159                 /*
2160                 **  if prescan() failed go a bit backwards; this is a hack,
2161                 **  there should be some better error recovery.
2162                 */
2163
2164                 if (res == NULL && p > name &&
2165                     !((SM_ISSPACE(*p)) || *p == ',' || *p == '\0'))
2166                         --p;
2167                 savechar = *p;
2168                 *p = '\0';
2169
2170                 /* translate the name to be relative */
2171                 flags = RF_HEADERADDR|RF_ADDDOMAIN;
2172                 if (bitset(H_FROM, h->h_flags))
2173                         flags |= RF_SENDERADDR;
2174 #if USERDB
2175                 else if (e->e_from.q_mailer != NULL &&
2176                          bitnset(M_UDBRECIPIENT, e->e_from.q_mailer->m_flags))
2177                 {
2178                         char *q;
2179
2180                         q = udbsender(name, e->e_rpool);
2181                         if (q != NULL)
2182                                 name = q;
2183                 }
2184 #endif /* USERDB */
2185                 status = EX_OK;
2186                 name = remotename(name, mci->mci_mailer, flags, &status, e);
2187                 if (status != EX_OK && bitnset(M_xSMTP, mci->mci_mailer->m_flags))
2188                 {
2189                         if (status == EX_TEMPFAIL)
2190                                 mci->mci_flags |= MCIF_NOTSTICKY;
2191                         goto writeerr;
2192                 }
2193                 if (*name == '\0')
2194                 {
2195                         *p = savechar;
2196                         continue;
2197                 }
2198                 name = denlstring(name, false, true);
2199
2200                 /* output the name with nice formatting */
2201                 opos += strlen(name);
2202                 if (!firstone)
2203                         opos += 2;
2204                 if (opos > omax && !firstone)
2205                 {
2206                         (void) sm_strlcpy(obp, ",\n", SPACELEFT(obuf, obp));
2207                         if (!putxline(obuf, strlen(obuf), mci, putflags))
2208                                 goto writeerr;
2209                         obp = obuf;
2210                         (void) sm_strlcpy(obp, "        ", sizeof(obuf));
2211                         opos = strlen(obp);
2212                         obp += opos;
2213                         opos += strlen(name);
2214                 }
2215                 else if (!firstone)
2216                 {
2217                         (void) sm_strlcpy(obp, ", ", SPACELEFT(obuf, obp));
2218                         obp += 2;
2219                 }
2220
2221                 while ((c = *name++) != '\0' && obp < &obuf[MAXLINE])
2222                         *obp++ = c;
2223                 firstone = false;
2224                 *p = savechar;
2225         }
2226         if (obp < &obuf[sizeof(obuf)])
2227                 *obp = '\0';
2228         else
2229                 obuf[sizeof(obuf) - 1] = '\0';
2230         return putxline(obuf, strlen(obuf), mci, putflags);
2231
2232   writeerr:
2233         return false;
2234 }
2235
2236 /*
2237 **  COPYHEADER -- copy header list
2238 **
2239 **      This routine is the equivalent of newstr for header lists
2240 **
2241 **      Parameters:
2242 **              header -- list of header structures to copy.
2243 **              rpool -- resource pool, or NULL
2244 **
2245 **      Returns:
2246 **              a copy of 'header'.
2247 **
2248 **      Side Effects:
2249 **              none.
2250 */
2251
2252 HDR *
2253 copyheader(header, rpool)
2254         register HDR *header;
2255         SM_RPOOL_T *rpool;
2256 {
2257         register HDR *newhdr;
2258         HDR *ret;
2259         register HDR **tail = &ret;
2260
2261         while (header != NULL)
2262         {
2263                 newhdr = (HDR *) sm_rpool_malloc_x(rpool, sizeof(*newhdr));
2264                 STRUCTCOPY(*header, *newhdr);
2265                 *tail = newhdr;
2266                 tail = &newhdr->h_link;
2267                 header = header->h_link;
2268         }
2269         *tail = NULL;
2270
2271         return ret;
2272 }
2273
2274 /*
2275 **  FIX_MIME_HEADER -- possibly truncate/rebalance parameters in a MIME header
2276 **
2277 **      Run through all of the parameters of a MIME header and
2278 **      possibly truncate and rebalance the parameter according
2279 **      to MaxMimeFieldLength.
2280 **
2281 **      Parameters:
2282 **              h -- the header to truncate/rebalance
2283 **              e -- the current envelope
2284 **
2285 **      Returns:
2286 **              length of last offending field, 0 if all ok.
2287 **
2288 **      Side Effects:
2289 **              string modified in place
2290 */
2291
2292 static size_t
2293 fix_mime_header(h, e)
2294         HDR *h;
2295         ENVELOPE *e;
2296 {
2297         char *begin = h->h_value;
2298         char *end;
2299         size_t len = 0;
2300         size_t retlen = 0;
2301
2302         if (begin == NULL || *begin == '\0')
2303                 return 0;
2304
2305         /* Split on each ';' */
2306         /* find_character() never returns NULL */
2307         while ((end = find_character(begin, ';')) != NULL)
2308         {
2309                 char save = *end;
2310                 char *bp;
2311
2312                 *end = '\0';
2313
2314                 len = strlen(begin);
2315
2316                 /* Shorten individual parameter */
2317                 if (shorten_rfc822_string(begin, MaxMimeFieldLength))
2318                 {
2319                         if (len < MaxMimeFieldLength)
2320                         {
2321                                 /* we only rebalanced a bogus field */
2322                                 sm_syslog(LOG_ALERT, e->e_id,
2323                                           "Fixed MIME %s header field (possible attack)",
2324                                           h->h_field);
2325                                 if (tTd(34, 11))
2326                                         sm_dprintf("  fixed MIME %s header field (possible attack)\n",
2327                                                    h->h_field);
2328                         }
2329                         else
2330                         {
2331                                 /* we actually shortened the header */
2332                                 retlen = len;
2333                         }
2334                 }
2335
2336                 /* Collapse the possibly shortened string with rest */
2337                 bp = begin + strlen(begin);
2338                 if (bp != end)
2339                 {
2340                         char *ep = end;
2341
2342                         *end = save;
2343                         end = bp;
2344
2345                         /* copy character by character due to overlap */
2346                         while (*ep != '\0')
2347                                 *bp++ = *ep++;
2348                         *bp = '\0';
2349                 }
2350                 else
2351                         *end = save;
2352                 if (*end == '\0')
2353                         break;
2354
2355                 /* Move past ';' */
2356                 begin = end + 1;
2357         }
2358         return retlen;
2359 }