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 (isascii(*p) && 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 (isascii(*p) && 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; isascii(*p) && 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);
 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 (isascii(*s) && 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 (isascii(*s) && 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 /* 0 */
 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];
1123         char mbuf[MAXNAME + 1];
1124
1125         /* don't allow newlines in the message-id */
1126         /* XXX do we still need this? sm_syslog() replaces control chars */
1127         if (msgid != NULL)
1128         {
1129                 size_t l;
1130
1131                 l = strlen(msgid);
1132                 if (l > sizeof(mbuf) - 1)
1133                         l = sizeof(mbuf) - 1;
1134                 memmove(mbuf, msgid, l);
1135                 mbuf[l] = '\0';
1136                 p = mbuf;
1137                 while ((p = strchr(p, '\n')) != NULL)
1138                         *p++ = ' ';
1139         }
1140
1141         if (bitset(EF_RESPONSE, e->e_flags))
1142                 name = "[RESPONSE]";
1143         else if ((name = macvalue('_', e)) != NULL)
1144                 /* EMPTY */
1145                 ;
1146         else if (RealHostName == NULL)
1147                 name = "localhost";
1148         else if (RealHostName[0] == '[')
1149                 name = RealHostName;
1150         else
1151         {
1152                 name = hbuf;
1153                 (void) sm_snprintf(hbuf, sizeof(hbuf), "%.80s", RealHostName);
1154                 if (RealHostAddr.sa.sa_family != 0)
1155                 {
1156                         p = &hbuf[strlen(hbuf)];
1157                         (void) sm_snprintf(p, SPACELEFT(hbuf, p),
1158                                            " (%.100s)",
1159                                            anynet_ntoa(&RealHostAddr));
1160                 }
1161         }
1162
1163         /* some versions of syslog only take 5 printf args */
1164 #if (SYSLOG_BUFSIZE) >= 256
1165         sbp = sbuf;
1166         (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1167                 "from=%.200s, size=%ld, class=%d, nrcpts=%d",
1168                 e->e_from.q_paddr == NULL ? "<NONE>" : e->e_from.q_paddr,
1169                 PRT_NONNEGL(e->e_msgsize), e->e_class, e->e_nrcpts);
1170         sbp += strlen(sbp);
1171         if (msgid != NULL)
1172         {
1173                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1174                                 ", msgid=%.100s", mbuf);
1175                 sbp += strlen(sbp);
1176         }
1177         if (e->e_bodytype != NULL)
1178         {
1179                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1180                                 ", bodytype=%.20s", e->e_bodytype);
1181                 sbp += strlen(sbp);
1182         }
1183         p = macvalue('r', e);
1184         if (p != NULL)
1185         {
1186                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1187                                 ", proto=%.20s", p);
1188                 sbp += strlen(sbp);
1189         }
1190         p = macvalue(macid("{daemon_name}"), e);
1191         if (p != NULL)
1192         {
1193                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1194                                 ", daemon=%.20s", p);
1195                 sbp += strlen(sbp);
1196         }
1197         sm_syslog(LOG_INFO, e->e_id, "%.850s, relay=%s", sbuf, name);
1198
1199 #else /* (SYSLOG_BUFSIZE) >= 256 */
1200
1201         sm_syslog(LOG_INFO, e->e_id,
1202                   "from=%s",
1203                   e->e_from.q_paddr == NULL ? "<NONE>"
1204                                             : shortenstring(e->e_from.q_paddr,
1205                                                             83));
1206         sm_syslog(LOG_INFO, e->e_id,
1207                   "size=%ld, class=%ld, nrcpts=%d",
1208                   PRT_NONNEGL(e->e_msgsize), e->e_class, e->e_nrcpts);
1209         if (msgid != NULL)
1210                 sm_syslog(LOG_INFO, e->e_id,
1211                           "msgid=%s",
1212                           shortenstring(mbuf, 83));
1213         sbp = sbuf;
1214         *sbp = '\0';
1215         if (e->e_bodytype != NULL)
1216         {
1217                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1218                                 "bodytype=%.20s, ", e->e_bodytype);
1219                 sbp += strlen(sbp);
1220         }
1221         p = macvalue('r', e);
1222         if (p != NULL)
1223         {
1224                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1225                                 "proto=%.20s, ", p);
1226                 sbp += strlen(sbp);
1227         }
1228         sm_syslog(LOG_INFO, e->e_id,
1229                   "%.400srelay=%s", sbuf, name);
1230 #endif /* (SYSLOG_BUFSIZE) >= 256 */
1231 }
1232
1233 /*
1234 **  PRIENCODE -- encode external priority names into internal values.
1235 **
1236 **      Parameters:
1237 **              p -- priority in ascii.
1238 **
1239 **      Returns:
1240 **              priority as a numeric level.
1241 **
1242 **      Side Effects:
1243 **              none.
1244 */
1245
1246 static int
1247 priencode(p)
1248         char *p;
1249 {
1250         register int i;
1251
1252         for (i = 0; i < NumPriorities; i++)
1253         {
1254                 if (sm_strcasecmp(p, Priorities[i].pri_name) == 0)
1255                         return Priorities[i].pri_val;
1256         }
1257
1258         /* unknown priority */
1259         return 0;
1260 }
1261
1262 /*
1263 **  CRACKADDR -- parse an address and turn it into a macro
1264 **
1265 **      This doesn't actually parse the address -- it just extracts
1266 **      it and replaces it with "$g".  The parse is totally ad hoc
1267 **      and isn't even guaranteed to leave something syntactically
1268 **      identical to what it started with.  However, it does leave
1269 **      something semantically identical if possible, else at least
1270 **      syntactically correct.
1271 **
1272 **      For example, it changes "Real Name <real@example.com> (Comment)"
1273 **      to "Real Name <$g> (Comment)".
1274 **
1275 **      This algorithm has been cleaned up to handle a wider range
1276 **      of cases -- notably quoted and backslash escaped strings.
1277 **      This modification makes it substantially better at preserving
1278 **      the original syntax.
1279 **
1280 **      Parameters:
1281 **              addr -- the address to be cracked.
1282 **              e -- the current envelope.
1283 **
1284 **      Returns:
1285 **              a pointer to the new version.
1286 **
1287 **      Side Effects:
1288 **              none.
1289 **
1290 **      Warning:
1291 **              The return value is saved in local storage and should
1292 **              be copied if it is to be reused.
1293 */
1294
1295 #define SM_HAVE_ROOM            ((bp < buflim) && (buflim <= bufend))
1296
1297 /*
1298 **  Append a character to bp if we have room.
1299 **  If not, punt and return $g.
1300 */
1301
1302 #define SM_APPEND_CHAR(c)                                       \
1303         do                                                      \
1304         {                                                       \
1305                 if (SM_HAVE_ROOM)                               \
1306                         *bp++ = (c);                            \
1307                 else                                            \
1308                         goto returng;                           \
1309         } while (0)
1310
1311 #if MAXNAME < 10
1312 ERROR MAXNAME must be at least 10
1313 #endif /* MAXNAME < 10 */
1314
1315 char *
1316 crackaddr(addr, e)
1317         register char *addr;
1318         ENVELOPE *e;
1319 {
1320         register char *p;
1321         register char c;
1322         int cmtlev;                     /* comment level in input string */
1323         int realcmtlev;                 /* comment level in output string */
1324         int anglelev;                   /* angle level in input string */
1325         int copylev;                    /* 0 == in address, >0 copying */
1326         int bracklev;                   /* bracket level for IPv6 addr check */
1327         bool addangle;                  /* put closing angle in output */
1328         bool qmode;                     /* quoting in original string? */
1329         bool realqmode;                 /* quoting in output string? */
1330         bool putgmac = false;           /* already wrote $g */
1331         bool quoteit = false;           /* need to quote next character */
1332         bool gotangle = false;          /* found first '<' */
1333         bool gotcolon = false;          /* found a ':' */
1334         register char *bp;
1335         char *buflim;
1336         char *bufhead;
1337         char *addrhead;
1338         char *bufend;
1339         static char buf[MAXNAME + 1];
1340
1341         if (tTd(33, 1))
1342                 sm_dprintf("crackaddr(%s)\n", addr);
1343
1344         buflim = bufend = &buf[sizeof(buf) - 1];
1345         bp = bufhead = buf;
1346
1347         /* skip over leading spaces but preserve them */
1348         while (*addr != '\0' && isascii(*addr) && isspace(*addr))
1349         {
1350                 SM_APPEND_CHAR(*addr);
1351                 addr++;
1352         }
1353         bufhead = bp;
1354
1355         /*
1356         **  Start by assuming we have no angle brackets.  This will be
1357         **  adjusted later if we find them.
1358         */
1359
1360         p = addrhead = addr;
1361         copylev = anglelev = cmtlev = realcmtlev = 0;
1362         bracklev = 0;
1363         qmode = realqmode = addangle = false;
1364
1365         while ((c = *p++) != '\0')
1366         {
1367                 /*
1368                 **  Try to keep legal syntax using spare buffer space
1369                 **  (maintained by buflim).
1370                 */
1371
1372                 if (copylev > 0)
1373                         SM_APPEND_CHAR(c);
1374
1375                 /* check for backslash escapes */
1376                 if (c == '\\')
1377                 {
1378                         /* arrange to quote the address */
1379                         if (cmtlev <= 0 && !qmode)
1380                                 quoteit = true;
1381
1382                         if ((c = *p++) == '\0')
1383                         {
1384                                 /* too far */
1385                                 p--;
1386                                 goto putg;
1387                         }
1388                         if (copylev > 0)
1389                                 SM_APPEND_CHAR(c);
1390                         goto putg;
1391                 }
1392
1393                 /* check for quoted strings */
1394                 if (c == '"' && cmtlev <= 0)
1395                 {
1396                         qmode = !qmode;
1397                         if (copylev > 0 && SM_HAVE_ROOM)
1398                         {
1399                                 if (realqmode)
1400                                         buflim--;
1401                                 else
1402                                         buflim++;
1403                                 realqmode = !realqmode;
1404                         }
1405                         continue;
1406                 }
1407                 if (qmode)
1408                         goto putg;
1409
1410                 /* check for comments */
1411                 if (c == '(')
1412                 {
1413                         cmtlev++;
1414
1415                         /* allow space for closing paren */
1416                         if (SM_HAVE_ROOM)
1417                         {
1418                                 buflim--;
1419                                 realcmtlev++;
1420                                 if (copylev++ <= 0)
1421                                 {
1422                                         if (bp != bufhead)
1423                                                 SM_APPEND_CHAR(' ');
1424                                         SM_APPEND_CHAR(c);
1425                                 }
1426                         }
1427                 }
1428                 if (cmtlev > 0)
1429                 {
1430                         if (c == ')')
1431                         {
1432                                 cmtlev--;
1433                                 copylev--;
1434                                 if (SM_HAVE_ROOM)
1435                                 {
1436                                         realcmtlev--;
1437                                         buflim++;
1438                                 }
1439                         }
1440                         continue;
1441                 }
1442                 else if (c == ')')
1443                 {
1444                         /* syntax error: unmatched ) */
1445                         if (copylev > 0 && SM_HAVE_ROOM && bp > bufhead)
1446                                 bp--;
1447                 }
1448
1449                 /* count nesting on [ ... ] (for IPv6 domain literals) */
1450                 if (c == '[')
1451                         bracklev++;
1452                 else if (c == ']')
1453                         bracklev--;
1454
1455                 /* check for group: list; syntax */
1456                 if (c == ':' && anglelev <= 0 && bracklev <= 0 &&
1457                     !gotcolon && !ColonOkInAddr)
1458                 {
1459                         register char *q;
1460
1461                         /*
1462                         **  Check for DECnet phase IV ``::'' (host::user)
1463                         **  or DECnet phase V ``:.'' syntaxes.  The latter
1464                         **  covers ``user@DEC:.tay.myhost'' and
1465                         **  ``DEC:.tay.myhost::user'' syntaxes (bletch).
1466                         */
1467
1468                         if (*p == ':' || *p == '.')
1469                         {
1470                                 if (cmtlev <= 0 && !qmode)
1471                                         quoteit = true;
1472                                 if (copylev > 0)
1473                                 {
1474                                         SM_APPEND_CHAR(c);
1475                                         SM_APPEND_CHAR(*p);
1476                                 }
1477                                 p++;
1478                                 goto putg;
1479                         }
1480
1481                         gotcolon = true;
1482
1483                         bp = bufhead;
1484                         if (quoteit)
1485                         {
1486                                 SM_APPEND_CHAR('"');
1487
1488                                 /* back up over the ':' and any spaces */
1489                                 --p;
1490                                 while (p > addr &&
1491                                        isascii(*--p) && isspace(*p))
1492                                         continue;
1493                                 p++;
1494                         }
1495                         for (q = addrhead; q < p; )
1496                         {
1497                                 c = *q++;
1498                                 if (quoteit && c == '"')
1499                                         SM_APPEND_CHAR('\\');
1500                                 SM_APPEND_CHAR(c);
1501                         }
1502                         if (quoteit)
1503                         {
1504                                 if (bp == &bufhead[1])
1505                                         bp--;
1506                                 else
1507                                         SM_APPEND_CHAR('"');
1508                                 while ((c = *p++) != ':')
1509                                         SM_APPEND_CHAR(c);
1510                                 SM_APPEND_CHAR(c);
1511                         }
1512
1513                         /* any trailing white space is part of group: */
1514                         while (isascii(*p) && isspace(*p))
1515                         {
1516                                 SM_APPEND_CHAR(*p);
1517                                 p++;
1518                         }
1519                         copylev = 0;
1520                         putgmac = quoteit = false;
1521                         bufhead = bp;
1522                         addrhead = p;
1523                         continue;
1524                 }
1525
1526                 if (c == ';' && copylev <= 0 && !ColonOkInAddr)
1527                         SM_APPEND_CHAR(c);
1528
1529                 /* check for characters that may have to be quoted */
1530                 if (strchr(MustQuoteChars, c) != NULL)
1531                 {
1532                         /*
1533                         **  If these occur as the phrase part of a <>
1534                         **  construct, but are not inside of () or already
1535                         **  quoted, they will have to be quoted.  Note that
1536                         **  now (but don't actually do the quoting).
1537                         */
1538
1539                         if (cmtlev <= 0 && !qmode)
1540                                 quoteit = true;
1541                 }
1542
1543                 /* check for angle brackets */
1544                 if (c == '<')
1545                 {
1546                         register char *q;
1547
1548                         /* assume first of two angles is bogus */
1549                         if (gotangle)
1550                                 quoteit = true;
1551                         gotangle = true;
1552
1553                         /* oops -- have to change our mind */
1554                         anglelev = 1;
1555                         if (SM_HAVE_ROOM)
1556                         {
1557                                 if (!addangle)
1558                                         buflim--;
1559                                 addangle = true;
1560                         }
1561
1562                         bp = bufhead;
1563                         if (quoteit)
1564                         {
1565                                 SM_APPEND_CHAR('"');
1566
1567                                 /* back up over the '<' and any spaces */
1568                                 --p;
1569                                 while (p > addr &&
1570                                        isascii(*--p) && isspace(*p))
1571                                         continue;
1572                                 p++;
1573                         }
1574                         for (q = addrhead; q < p; )
1575                         {
1576                                 c = *q++;
1577                                 if (quoteit && c == '"')
1578                                 {
1579                                         SM_APPEND_CHAR('\\');
1580                                         SM_APPEND_CHAR(c);
1581                                 }
1582                                 else
1583                                         SM_APPEND_CHAR(c);
1584                         }
1585                         if (quoteit)
1586                         {
1587                                 if (bp == &buf[1])
1588                                         bp--;
1589                                 else
1590                                         SM_APPEND_CHAR('"');
1591                                 while ((c = *p++) != '<')
1592                                         SM_APPEND_CHAR(c);
1593                                 SM_APPEND_CHAR(c);
1594                         }
1595                         copylev = 0;
1596                         putgmac = quoteit = false;
1597                         continue;
1598                 }
1599
1600                 if (c == '>')
1601                 {
1602                         if (anglelev > 0)
1603                         {
1604                                 anglelev--;
1605                                 if (SM_HAVE_ROOM)
1606                                 {
1607                                         if (addangle)
1608                                                 buflim++;
1609                                         addangle = false;
1610                                 }
1611                         }
1612                         else if (SM_HAVE_ROOM)
1613                         {
1614                                 /* syntax error: unmatched > */
1615                                 if (copylev > 0 && bp > bufhead)
1616                                         bp--;
1617                                 quoteit = true;
1618                                 continue;
1619                         }
1620                         if (copylev++ <= 0)
1621                                 SM_APPEND_CHAR(c);
1622                         continue;
1623                 }
1624
1625                 /* must be a real address character */
1626         putg:
1627                 if (copylev <= 0 && !putgmac)
1628                 {
1629                         if (bp > buf && bp[-1] == ')')
1630                                 SM_APPEND_CHAR(' ');
1631                         SM_APPEND_CHAR(MACROEXPAND);
1632                         SM_APPEND_CHAR('g');
1633                         putgmac = true;
1634                 }
1635         }
1636
1637         /* repair any syntactic damage */
1638         if (realqmode && bp < bufend)
1639                 *bp++ = '"';
1640         while (realcmtlev-- > 0 && bp < bufend)
1641                 *bp++ = ')';
1642         if (addangle && bp < bufend)
1643                 *bp++ = '>';
1644         *bp = '\0';
1645         if (bp < bufend)
1646                 goto success;
1647
1648  returng:
1649         /* String too long, punt */
1650         buf[0] = '<';
1651         buf[1] = MACROEXPAND;
1652         buf[2]= 'g';
1653         buf[3] = '>';
1654         buf[4]= '\0';
1655         sm_syslog(LOG_ALERT, e->e_id,
1656                   "Dropped invalid comments from header address");
1657
1658  success:
1659         if (tTd(33, 1))
1660         {
1661                 sm_dprintf("crackaddr=>`");
1662                 xputs(sm_debug_file(), buf);
1663                 sm_dprintf("'\n");
1664         }
1665         return buf;
1666 }
1667
1668 /*
1669 **  PUTHEADER -- put the header part of a message from the in-core copy
1670 **
1671 **      Parameters:
1672 **              mci -- the connection information.
1673 **              hdr -- the header to put.
1674 **              e -- envelope to use.
1675 **              flags -- MIME conversion flags.
1676 **
1677 **      Returns:
1678 **              true iff header part was written successfully
1679 **
1680 **      Side Effects:
1681 **              none.
1682 */
1683
1684 bool
1685 putheader(mci, hdr, e, flags)
1686         register MCI *mci;
1687         HDR *hdr;
1688         register ENVELOPE *e;
1689         int flags;
1690 {
1691         register HDR *h;
1692         char buf[SM_MAX(MAXLINE,BUFSIZ)];
1693         char obuf[MAXLINE];
1694
1695         if (tTd(34, 1))
1696                 sm_dprintf("--- putheader, mailer = %s ---\n",
1697                         mci->mci_mailer->m_name);
1698
1699         /*
1700         **  If we're in MIME mode, we're not really in the header of the
1701         **  message, just the header of one of the parts of the body of
1702         **  the message.  Therefore MCIF_INHEADER should not be turned on.
1703         */
1704
1705         if (!bitset(MCIF_INMIME, mci->mci_flags))
1706                 mci->mci_flags |= MCIF_INHEADER;
1707
1708         for (h = hdr; h != NULL; h = h->h_link)
1709         {
1710                 register char *p = h->h_value;
1711                 char *q;
1712
1713                 if (tTd(34, 11))
1714                 {
1715                         sm_dprintf("  %s:", h->h_field);
1716                         xputs(sm_debug_file(), p);
1717                 }
1718
1719                 /* Skip empty headers */
1720                 if (h->h_value == NULL)
1721                         continue;
1722
1723                 /* heuristic shortening of MIME fields to avoid MUA overflows */
1724                 if (MaxMimeFieldLength > 0 &&
1725                     wordinclass(h->h_field,
1726                                 macid("{checkMIMEFieldHeaders}")))
1727                 {
1728                         size_t len;
1729
1730                         len = fix_mime_header(h, e);
1731                         if (len > 0)
1732                         {
1733                                 sm_syslog(LOG_ALERT, e->e_id,
1734                                           "Truncated MIME %s header due to field size (length = %ld) (possible attack)",
1735                                           h->h_field, (unsigned long) len);
1736                                 if (tTd(34, 11))
1737                                         sm_dprintf("  truncated MIME %s header due to field size  (length = %ld) (possible attack)\n",
1738                                                    h->h_field,
1739                                                    (unsigned long) len);
1740                         }
1741                 }
1742
1743                 if (MaxMimeHeaderLength > 0 &&
1744                     wordinclass(h->h_field,
1745                                 macid("{checkMIMETextHeaders}")))
1746                 {
1747                         size_t len;
1748
1749                         len = strlen(h->h_value);
1750                         if (len > (size_t) MaxMimeHeaderLength)
1751                         {
1752                                 h->h_value[MaxMimeHeaderLength - 1] = '\0';
1753                                 sm_syslog(LOG_ALERT, e->e_id,
1754                                           "Truncated long MIME %s header (length = %ld) (possible attack)",
1755                                           h->h_field, (unsigned long) len);
1756                                 if (tTd(34, 11))
1757                                         sm_dprintf("  truncated long MIME %s header (length = %ld) (possible attack)\n",
1758                                                    h->h_field,
1759                                                    (unsigned long) len);
1760                         }
1761                 }
1762
1763                 if (MaxMimeHeaderLength > 0 &&
1764                     wordinclass(h->h_field,
1765                                 macid("{checkMIMEHeaders}")))
1766                 {
1767                         size_t len;
1768
1769                         len = strlen(h->h_value);
1770                         if (shorten_rfc822_string(h->h_value,
1771                                                   MaxMimeHeaderLength))
1772                         {
1773                                 if (len < MaxMimeHeaderLength)
1774                                 {
1775                                         /* we only rebalanced a bogus header */
1776                                         sm_syslog(LOG_ALERT, e->e_id,
1777                                                   "Fixed MIME %s header (possible attack)",
1778                                                   h->h_field);
1779                                         if (tTd(34, 11))
1780                                                 sm_dprintf("  fixed MIME %s header (possible attack)\n",
1781                                                            h->h_field);
1782                                 }
1783                                 else
1784                                 {
1785                                         /* we actually shortened header */
1786                                         sm_syslog(LOG_ALERT, e->e_id,
1787                                                   "Truncated long MIME %s header (length = %ld) (possible attack)",
1788                                                   h->h_field,
1789                                                   (unsigned long) len);
1790                                         if (tTd(34, 11))
1791                                                 sm_dprintf("  truncated long MIME %s header (length = %ld) (possible attack)\n",
1792                                                            h->h_field,
1793                                                            (unsigned long) len);
1794                                 }
1795                         }
1796                 }
1797
1798                 /*
1799                 **  Suppress Content-Transfer-Encoding: if we are MIMEing
1800                 **  and we are potentially converting from 8 bit to 7 bit
1801                 **  MIME.  If converting, add a new CTE header in
1802                 **  mime8to7().
1803                 */
1804
1805                 if (bitset(H_CTE, h->h_flags) &&
1806                     bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME,
1807                            mci->mci_flags) &&
1808                     !bitset(M87F_NO8TO7, flags))
1809                 {
1810                         if (tTd(34, 11))
1811                                 sm_dprintf(" (skipped (content-transfer-encoding))\n");
1812                         continue;
1813                 }
1814
1815                 if (bitset(MCIF_INMIME, mci->mci_flags))
1816                 {
1817                         if (tTd(34, 11))
1818                                 sm_dprintf("\n");
1819                         if (!put_vanilla_header(h, p, mci))
1820                                 goto writeerr;
1821                         continue;
1822                 }
1823
1824                 if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
1825                     !bitintersect(h->h_mflags, mci->mci_mailer->m_flags) &&
1826                     (h->h_macro == '\0' ||
1827                      (q = macvalue(bitidx(h->h_macro), e)) == NULL ||
1828                      *q == '\0'))
1829                 {
1830                         if (tTd(34, 11))
1831                                 sm_dprintf(" (skipped)\n");
1832                         continue;
1833                 }
1834
1835                 /* handle Resent-... headers specially */
1836                 if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
1837                 {
1838                         if (tTd(34, 11))
1839                                 sm_dprintf(" (skipped (resent))\n");
1840                         continue;
1841                 }
1842
1843                 /* suppress return receipts if requested */
1844                 if (bitset(H_RECEIPTTO, h->h_flags) &&
1845                     (RrtImpliesDsn || bitset(EF_NORECEIPT, e->e_flags)))
1846                 {
1847                         if (tTd(34, 11))
1848                                 sm_dprintf(" (skipped (receipt))\n");
1849                         continue;
1850                 }
1851
1852                 /* macro expand value if generated internally */
1853                 if (bitset(H_DEFAULT, h->h_flags) ||
1854                     bitset(H_BINDLATE, h->h_flags))
1855                 {
1856                         expand(p, buf, sizeof(buf), e);
1857                         p = buf;
1858                         if (*p == '\0')
1859                         {
1860                                 if (tTd(34, 11))
1861                                         sm_dprintf(" (skipped -- null value)\n");
1862                                 continue;
1863                         }
1864                 }
1865
1866                 if (bitset(H_BCC, h->h_flags))
1867                 {
1868                         /* Bcc: field -- either truncate or delete */
1869                         if (bitset(EF_DELETE_BCC, e->e_flags))
1870                         {
1871                                 if (tTd(34, 11))
1872                                         sm_dprintf(" (skipped -- bcc)\n");
1873                         }
1874                         else
1875                         {
1876                                 /* no other recipient headers: truncate value */
1877                                 (void) sm_strlcpyn(obuf, sizeof(obuf), 2,
1878                                                    h->h_field, ":");
1879                                 if (!putline(obuf, mci))
1880                                         goto writeerr;
1881                         }
1882                         continue;
1883                 }
1884
1885                 if (tTd(34, 11))
1886                         sm_dprintf("\n");
1887
1888                 if (bitset(H_FROM|H_RCPT, h->h_flags))
1889                 {
1890                         /* address field */
1891                         bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags);
1892
1893                         if (bitset(H_FROM, h->h_flags))
1894                                 oldstyle = false;
1895                         commaize(h, p, oldstyle, mci, e,
1896                                  PXLF_HEADER | PXLF_STRIPMQUOTE);
1897                 }
1898                 else
1899                 {
1900                         if (!put_vanilla_header(h, p, mci))
1901                                 goto writeerr;
1902                 }
1903         }
1904
1905         /*
1906         **  If we are converting this to a MIME message, add the
1907         **  MIME headers (but not in MIME mode!).
1908         */
1909
1910 #if MIME8TO7
1911         if (bitset(MM_MIME8BIT, MimeMode) &&
1912             bitset(EF_HAS8BIT, e->e_flags) &&
1913             !bitset(EF_DONT_MIME, e->e_flags) &&
1914             !bitnset(M_8BITS, mci->mci_mailer->m_flags) &&
1915             !bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME, mci->mci_flags) &&
1916             hvalue("MIME-Version", e->e_header) == NULL)
1917         {
1918                 if (!putline("MIME-Version: 1.0", mci))
1919                         goto writeerr;
1920                 if (hvalue("Content-Type", e->e_header) == NULL)
1921                 {
1922                         (void) sm_snprintf(obuf, sizeof(obuf),
1923                                         "Content-Type: text/plain; charset=%s",
1924                                         defcharset(e));
1925                         if (!putline(obuf, mci))
1926                                 goto writeerr;
1927                 }
1928                 if (hvalue("Content-Transfer-Encoding", e->e_header) == NULL
1929                     && !putline("Content-Transfer-Encoding: 8bit", mci))
1930                         goto writeerr;
1931         }
1932 #endif /* MIME8TO7 */
1933         return true;
1934
1935   writeerr:
1936         return false;
1937 }
1938
1939 /*
1940 **  PUT_VANILLA_HEADER -- output a fairly ordinary header
1941 **
1942 **      Parameters:
1943 **              h -- the structure describing this header
1944 **              v -- the value of this header
1945 **              mci -- the connection info for output
1946 **
1947 **      Returns:
1948 **              true iff header was written successfully
1949 */
1950
1951 static bool
1952 put_vanilla_header(h, v, mci)
1953         HDR *h;
1954         char *v;
1955         MCI *mci;
1956 {
1957         register char *nlp;
1958         register char *obp;
1959         int putflags;
1960         char obuf[MAXLINE + 256];       /* additional length for h_field */
1961
1962         putflags = PXLF_HEADER | PXLF_STRIPMQUOTE;
1963         if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
1964                 putflags |= PXLF_STRIP8BIT;
1965         (void) sm_snprintf(obuf, sizeof(obuf), "%.200s:", h->h_field);
1966         obp = obuf + strlen(obuf);
1967         while ((nlp = strchr(v, '\n')) != NULL)
1968         {
1969                 int l;
1970
1971                 l = nlp - v;
1972
1973                 /*
1974                 **  XXX This is broken for SPACELEFT()==0
1975                 **  However, SPACELEFT() is always > 0 unless MAXLINE==1.
1976                 */
1977
1978                 if (SPACELEFT(obuf, obp) - 1 < (size_t) l)
1979                         l = SPACELEFT(obuf, obp) - 1;
1980
1981                 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s", l, v);
1982                 if (!putxline(obuf, strlen(obuf), mci, putflags))
1983                         goto writeerr;
1984                 v += l + 1;
1985                 obp = obuf;
1986                 if (*v != ' ' && *v != '\t')
1987                         *obp++ = ' ';
1988         }
1989
1990         /* XXX This is broken for SPACELEFT()==0 */
1991         (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s",
1992                            (int) (SPACELEFT(obuf, obp) - 1), v);
1993         return putxline(obuf, strlen(obuf), mci, putflags);
1994
1995   writeerr:
1996         return false;
1997 }
1998
1999 /*
2000 **  COMMAIZE -- output a header field, making a comma-translated list.
2001 **
2002 **      Parameters:
2003 **              h -- the header field to output.
2004 **              p -- the value to put in it.
2005 **              oldstyle -- true if this is an old style header.
2006 **              mci -- the connection information.
2007 **              e -- the envelope containing the message.
2008 **              putflags -- flags for putxline()
2009 **
2010 **      Returns:
2011 **              true iff header field was written successfully
2012 **
2013 **      Side Effects:
2014 **              outputs "p" to "mci".
2015 */
2016
2017 bool
2018 commaize(h, p, oldstyle, mci, e, putflags)
2019         register HDR *h;
2020         register char *p;
2021         bool oldstyle;
2022         register MCI *mci;
2023         register ENVELOPE *e;
2024         int putflags;
2025 {
2026         register char *obp;
2027         int opos, omax, spaces;
2028         bool firstone = true;
2029         char **res;
2030         char obuf[MAXLINE + 3];
2031
2032         /*
2033         **  Output the address list translated by the
2034         **  mailer and with commas.
2035         */
2036
2037         if (tTd(14, 2))
2038                 sm_dprintf("commaize(%s:%s)\n", h->h_field, p);
2039
2040         if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
2041                 putflags |= PXLF_STRIP8BIT;
2042
2043         obp = obuf;
2044         (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.200s:", h->h_field);
2045         /* opos = strlen(obp); instead of the next 3 lines? */
2046         opos = strlen(h->h_field) + 1;
2047         if (opos > 201)
2048                 opos = 201;
2049         obp += opos;
2050
2051         spaces = 0;
2052         while (*p != '\0' && isascii(*p) && isspace(*p))
2053         {
2054                 ++spaces;
2055                 ++p;
2056         }
2057         if (spaces > 0)
2058         {
2059                 SM_ASSERT(sizeof(obuf) > opos  * 2);
2060
2061                 /*
2062                 **  Restrict number of spaces to half the length of buffer
2063                 **  so the header field body can be put in here too.
2064                 **  Note: this is a hack...
2065                 */
2066
2067                 if (spaces > sizeof(obuf) / 2)
2068                         spaces = sizeof(obuf) / 2;
2069                 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%*s", spaces,
2070                                 "");
2071                 opos += spaces;
2072                 obp += spaces;
2073                 SM_ASSERT(obp < &obuf[MAXLINE]);
2074         }
2075
2076         omax = mci->mci_mailer->m_linelimit - 2;
2077         if (omax < 0 || omax > 78)
2078                 omax = 78;
2079
2080         /*
2081         **  Run through the list of values.
2082         */
2083
2084         while (*p != '\0')
2085         {
2086                 register char *name;
2087                 register int c;
2088                 char savechar;
2089                 int flags;
2090                 auto int status;
2091
2092                 /*
2093                 **  Find the end of the name.  New style names
2094                 **  end with a comma, old style names end with
2095                 **  a space character.  However, spaces do not
2096                 **  necessarily delimit an old-style name -- at
2097                 **  signs mean keep going.
2098                 */
2099
2100                 /* find end of name */
2101                 while ((isascii(*p) && isspace(*p)) || *p == ',')
2102                         p++;
2103                 name = p;
2104                 res = NULL;
2105                 for (;;)
2106                 {
2107                         auto char *oldp;
2108                         char pvpbuf[PSBUFSIZE];
2109
2110                         res = prescan(p, oldstyle ? ' ' : ',', pvpbuf,
2111                                       sizeof(pvpbuf), &oldp, ExtTokenTab, false);
2112                         p = oldp;
2113 #if _FFR_IGNORE_BOGUS_ADDR
2114                         /* ignore addresses that can't be parsed */
2115                         if (res == NULL)
2116                         {
2117                                 name = p;
2118                                 continue;
2119                         }
2120 #endif /* _FFR_IGNORE_BOGUS_ADDR */
2121
2122                         /* look to see if we have an at sign */
2123                         while (*p != '\0' && isascii(*p) && isspace(*p))
2124                                 p++;
2125
2126                         if (*p != '@')
2127                         {
2128                                 p = oldp;
2129                                 break;
2130                         }
2131                         ++p;
2132                         while (*p != '\0' && isascii(*p) && isspace(*p))
2133                                 p++;
2134                 }
2135                 /* at the end of one complete name */
2136
2137                 /* strip off trailing white space */
2138                 while (p >= name &&
2139                        ((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
2140                         p--;
2141                 if (++p == name)
2142                         continue;
2143
2144                 /*
2145                 **  if prescan() failed go a bit backwards; this is a hack,
2146                 **  there should be some better error recovery.
2147                 */
2148
2149                 if (res == NULL && p > name &&
2150                     !((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
2151                         --p;
2152                 savechar = *p;
2153                 *p = '\0';
2154
2155                 /* translate the name to be relative */
2156                 flags = RF_HEADERADDR|RF_ADDDOMAIN;
2157                 if (bitset(H_FROM, h->h_flags))
2158                         flags |= RF_SENDERADDR;
2159 #if USERDB
2160                 else if (e->e_from.q_mailer != NULL &&
2161                          bitnset(M_UDBRECIPIENT, e->e_from.q_mailer->m_flags))
2162                 {
2163                         char *q;
2164
2165                         q = udbsender(name, e->e_rpool);
2166                         if (q != NULL)
2167                                 name = q;
2168                 }
2169 #endif /* USERDB */
2170                 status = EX_OK;
2171                 name = remotename(name, mci->mci_mailer, flags, &status, e);
2172                 if (*name == '\0')
2173                 {
2174                         *p = savechar;
2175                         continue;
2176                 }
2177                 name = denlstring(name, false, true);
2178
2179                 /* output the name with nice formatting */
2180                 opos += strlen(name);
2181                 if (!firstone)
2182                         opos += 2;
2183                 if (opos > omax && !firstone)
2184                 {
2185                         (void) sm_strlcpy(obp, ",\n", SPACELEFT(obuf, obp));
2186                         if (!putxline(obuf, strlen(obuf), mci, putflags))
2187                                 goto writeerr;
2188                         obp = obuf;
2189                         (void) sm_strlcpy(obp, "        ", sizeof(obuf));
2190                         opos = strlen(obp);
2191                         obp += opos;
2192                         opos += strlen(name);
2193                 }
2194                 else if (!firstone)
2195                 {
2196                         (void) sm_strlcpy(obp, ", ", SPACELEFT(obuf, obp));
2197                         obp += 2;
2198                 }
2199
2200                 while ((c = *name++) != '\0' && obp < &obuf[MAXLINE])
2201                         *obp++ = c;
2202                 firstone = false;
2203                 *p = savechar;
2204         }
2205         if (obp < &obuf[sizeof(obuf)])
2206                 *obp = '\0';
2207         else
2208                 obuf[sizeof(obuf) - 1] = '\0';
2209         return putxline(obuf, strlen(obuf), mci, putflags);
2210
2211   writeerr:
2212         return false;
2213 }
2214
2215 /*
2216 **  COPYHEADER -- copy header list
2217 **
2218 **      This routine is the equivalent of newstr for header lists
2219 **
2220 **      Parameters:
2221 **              header -- list of header structures to copy.
2222 **              rpool -- resource pool, or NULL
2223 **
2224 **      Returns:
2225 **              a copy of 'header'.
2226 **
2227 **      Side Effects:
2228 **              none.
2229 */
2230
2231 HDR *
2232 copyheader(header, rpool)
2233         register HDR *header;
2234         SM_RPOOL_T *rpool;
2235 {
2236         register HDR *newhdr;
2237         HDR *ret;
2238         register HDR **tail = &ret;
2239
2240         while (header != NULL)
2241         {
2242                 newhdr = (HDR *) sm_rpool_malloc_x(rpool, sizeof(*newhdr));
2243                 STRUCTCOPY(*header, *newhdr);
2244                 *tail = newhdr;
2245                 tail = &newhdr->h_link;
2246                 header = header->h_link;
2247         }
2248         *tail = NULL;
2249
2250         return ret;
2251 }
2252
2253 /*
2254 **  FIX_MIME_HEADER -- possibly truncate/rebalance parameters in a MIME header
2255 **
2256 **      Run through all of the parameters of a MIME header and
2257 **      possibly truncate and rebalance the parameter according
2258 **      to MaxMimeFieldLength.
2259 **
2260 **      Parameters:
2261 **              h -- the header to truncate/rebalance
2262 **              e -- the current envelope
2263 **
2264 **      Returns:
2265 **              length of last offending field, 0 if all ok.
2266 **
2267 **      Side Effects:
2268 **              string modified in place
2269 */
2270
2271 static size_t
2272 fix_mime_header(h, e)
2273         HDR *h;
2274         ENVELOPE *e;
2275 {
2276         char *begin = h->h_value;
2277         char *end;
2278         size_t len = 0;
2279         size_t retlen = 0;
2280
2281         if (begin == NULL || *begin == '\0')
2282                 return 0;
2283
2284         /* Split on each ';' */
2285         /* find_character() never returns NULL */
2286         while ((end = find_character(begin, ';')) != NULL)
2287         {
2288                 char save = *end;
2289                 char *bp;
2290
2291                 *end = '\0';
2292
2293                 len = strlen(begin);
2294
2295                 /* Shorten individual parameter */
2296                 if (shorten_rfc822_string(begin, MaxMimeFieldLength))
2297                 {
2298                         if (len < MaxMimeFieldLength)
2299                         {
2300                                 /* we only rebalanced a bogus field */
2301                                 sm_syslog(LOG_ALERT, e->e_id,
2302                                           "Fixed MIME %s header field (possible attack)",
2303                                           h->h_field);
2304                                 if (tTd(34, 11))
2305                                         sm_dprintf("  fixed MIME %s header field (possible attack)\n",
2306                                                    h->h_field);
2307                         }
2308                         else
2309                         {
2310                                 /* we actually shortened the header */
2311                                 retlen = len;
2312                         }
2313                 }
2314
2315                 /* Collapse the possibly shortened string with rest */
2316                 bp = begin + strlen(begin);
2317                 if (bp != end)
2318                 {
2319                         char *ep = end;
2320
2321                         *end = save;
2322                         end = bp;
2323
2324                         /* copy character by character due to overlap */
2325                         while (*ep != '\0')
2326                                 *bp++ = *ep++;
2327                         *bp = '\0';
2328                 }
2329                 else
2330                         *end = save;
2331                 if (*end == '\0')
2332                         break;
2333
2334                 /* Move past ';' */
2335                 begin = end + 1;
2336         }
2337         return retlen;
2338 }