contrib/sendmail-8.14/sendmail/headers.c

   1 /*
   2  * Copyright (c) 1998-2004, 2006, 2007 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
   5  * Copyright (c) 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * By using this file, you agree to the terms and conditions set
   9  * forth in the LICENSE file which can be found at the top level of
  10  * the sendmail distribution.
  11  *
  12  */
  13
  14 #include <sendmail.h>
  15 #include <sm/sendmail.h>
  16
  17 SM_RCSID("@(#)$Id: headers.c,v 8.310 2007/02/07 22:44:35 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 (tTd(31, 2))
 381                 {
 382                         sm_dprintf("comparing header from (%s) against default (%s or %s)\n",
 383                                 fvalue, e->e_from.q_paddr, e->e_from.q_user);
 384                 }
 385                 if (e->e_from.q_paddr != NULL &&
 386                     e->e_from.q_mailer != NULL &&
 387                     bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags) &&
 388                     (strcmp(fvalue, e->e_from.q_paddr) == 0 ||
 389                      strcmp(fvalue, e->e_from.q_user) == 0))
 390                         dropfrom = true;
 391         }
 392
 393         /* delete default value for this header */
 394         for (hp = hdrp; (h = *hp) != NULL; hp = &h->h_link)
 395         {
 396                 if (sm_strcasecmp(fname, h->h_field) == 0 &&
 397                     !bitset(H_USER, h->h_flags) &&
 398                     !bitset(H_FORCE, h->h_flags))
 399                 {
 400                         if (nullheader)
 401                         {
 402                                 /* user-supplied value was null */
 403                                 return 0;
 404                         }
 405                         if (dropfrom)
 406                         {
 407                                 /* make this look like the user entered it */
 408                                 h->h_flags |= H_USER;
 409                                 return hi->hi_flags;
 410                         }
 411                         h->h_value = NULL;
 412                         if (!cond)
 413                         {
 414                                 /* copy conditions from default case */
 415                                 memmove((char *) mopts, (char *) h->h_mflags,
 416                                         sizeof(mopts));
 417                         }
 418                         h->h_macro = mid;
 419                 }
 420         }
 421
 422         /* create a new node */
 423         h = (HDR *) sm_rpool_malloc_x(e->e_rpool, sizeof(*h));
 424         h->h_field = sm_rpool_strdup_x(e->e_rpool, fname);
 425         h->h_value = sm_rpool_strdup_x(e->e_rpool, fvalue);
 426         h->h_link = NULL;
 427         memmove((char *) h->h_mflags, (char *) mopts, sizeof(mopts));
 428         h->h_macro = mid;
 429         *hp = h;
 430         h->h_flags = hi->hi_flags;
 431         if (bitset(pflag, CHHDR_USER) || bitset(pflag, CHHDR_QUEUE))
 432                 h->h_flags |= H_USER;
 433
 434         /* strip EOH flag if parsing MIME headers */
 435         if (headeronly)
 436                 h->h_flags &= ~H_EOH;
 437         if (bitset(pflag, CHHDR_DEF))
 438                 h->h_flags |= H_DEFAULT;
 439         if (cond || mid != '\0')
 440                 h->h_flags |= H_CHECK;
 441
 442         /* hack to see if this is a new format message */
 443         if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
 444             bitset(H_RCPT|H_FROM, h->h_flags) &&
 445             (strchr(fvalue, ',') != NULL || strchr(fvalue, '(') != NULL ||
 446              strchr(fvalue, '<') != NULL || strchr(fvalue, ';') != NULL))
 447         {
 448                 e->e_flags &= ~EF_OLDSTYLE;
 449         }
 450
 451         return h->h_flags;
 452 }
 453
 454 /*
 455 **  CHOMPHEADER -- process and save a header line.
 456 **
 457 **      Called by collect, readcf, and readqf to deal with header lines.
 458 **      This is just a wrapper for dochompheader().
 459 **
 460 **      Parameters:
 461 **              line -- header as a text line.
 462 **              pflag -- flags for chompheader() (from sendmail.h)
 463 **              hdrp -- a pointer to the place to save the header.
 464 **              e -- the envelope including this header.
 465 **
 466 **      Returns:
 467 **              flags for this header.
 468 **
 469 **      Side Effects:
 470 **              The header is saved on the header list.
 471 **              Contents of 'line' are destroyed.
 472 */
 473
 474
 475 unsigned long
 476 chompheader(line, pflag, hdrp, e)
 477         char *line;
 478         int pflag;
 479         HDR **hdrp;
 480         register ENVELOPE *e;
 481 {
 482         unsigned long rval;
 483
 484         if (tTd(31, 6))
 485         {
 486                 sm_dprintf("chompheader: ");
 487                 xputs(sm_debug_file(), line);
 488                 sm_dprintf("\n");
 489         }
 490
 491         /* quote this if user (not config file) input */
 492         if (bitset(pflag, CHHDR_USER))
 493         {
 494                 char xbuf[MAXLINE];
 495                 char *xbp = NULL;
 496                 int xbufs;
 497
 498                 xbufs = sizeof(xbuf);
 499                 xbp = quote_internal_chars(line, xbuf, &xbufs);
 500                 if (tTd(31, 7))
 501                 {
 502                         sm_dprintf("chompheader: quoted: ");
 503                         xputs(sm_debug_file(), xbp);
 504                         sm_dprintf("\n");
 505                 }
 506                 rval = dochompheader(xbp, pflag, hdrp, e);
 507                 if (xbp != xbuf)
 508                         sm_free(xbp);
 509         }
 510         else
 511                 rval = dochompheader(line, pflag, hdrp, e);
 512
 513         return rval;
 514 }
 515
 516 /*
 517 **  ALLOCHEADER -- allocate a header entry
 518 **
 519 **      Parameters:
 520 **              field -- the name of the header field (will not be copied).
 521 **              value -- the value of the field (will be copied).
 522 **              flags -- flags to add to h_flags.
 523 **              rp -- resource pool for allocations
 524 **              space -- add leading space?
 525 **
 526 **      Returns:
 527 **              Pointer to a newly allocated and populated HDR.
 528 **
 529 **      Notes:
 530 **              o field and value must be in internal format, i.e.,
 531 **              metacharacters must be "quoted", see quote_internal_chars().
 532 **              o maybe add more flags to decide:
 533 **                - what to copy (field/value)
 534 **                - whether to convert value to an internal format
 535 */
 536
 537 static HDR *
 538 allocheader(field, value, flags, rp, space)
 539         char *field;
 540         char *value;
 541         int flags;
 542         SM_RPOOL_T *rp;
 543         bool space;
 544 {
 545         HDR *h;
 546         STAB *s;
 547
 548         /* find info struct */
 549         s = stab(field, ST_HEADER, ST_FIND);
 550
 551         /* allocate space for new header */
 552         h = (HDR *) sm_rpool_malloc_x(rp, sizeof(*h));
 553         h->h_field = field;
 554         if (space)
 555         {
 556                 size_t l;
 557                 char *n;
 558
 559                 l = strlen(value);
 560                 SM_ASSERT(l + 2 > l);
 561                 n = sm_rpool_malloc_x(rp, l + 2);
 562                 n[0] = ' ';
 563                 n[1] = '\0';
 564                 sm_strlcpy(n + 1, value, l + 1);
 565                 h->h_value = n;
 566         }
 567         else
 568                 h->h_value = sm_rpool_strdup_x(rp, value);
 569         h->h_flags = flags;
 570         if (s != NULL)
 571                 h->h_flags |= s->s_header.hi_flags;
 572         clrbitmap(h->h_mflags);
 573         h->h_macro = '\0';
 574
 575         return h;
 576 }
 577
 578 /*
 579 **  ADDHEADER -- add a header entry to the end of the queue.
 580 **
 581 **      This bypasses the special checking of chompheader.
 582 **
 583 **      Parameters:
 584 **              field -- the name of the header field (will not be copied).
 585 **              value -- the value of the field (will be copied).
 586 **              flags -- flags to add to h_flags.
 587 **              e -- envelope.
 588 **              space -- add leading space?
 589 **
 590 **      Returns:
 591 **              none.
 592 **
 593 **      Side Effects:
 594 **              adds the field on the list of headers for this envelope.
 595 **
 596 **      Notes: field and value must be in internal format, i.e.,
 597 **              metacharacters must be "quoted", see quote_internal_chars().
 598 */
 599
 600 void
 601 addheader(field, value, flags, e, space)
 602         char *field;
 603         char *value;
 604         int flags;
 605         ENVELOPE *e;
 606         bool space;
 607 {
 608         register HDR *h;
 609         HDR **hp;
 610         HDR **hdrlist = &e->e_header;
 611
 612         /* find current place in list -- keep back pointer? */
 613         for (hp = hdrlist; (h = *hp) != NULL; hp = &h->h_link)
 614         {
 615                 if (sm_strcasecmp(field, h->h_field) == 0)
 616                         break;
 617         }
 618
 619         /* allocate space for new header */
 620         h = allocheader(field, value, flags, e->e_rpool, space);
 621         h->h_link = *hp;
 622         *hp = h;
 623 }
 624
 625 /*
 626 **  INSHEADER -- insert a header entry at the specified index
 627 **      This bypasses the special checking of chompheader.
 628 **
 629 **      Parameters:
 630 **              idx -- index into the header list at which to insert
 631 **              field -- the name of the header field (will be copied).
 632 **              value -- the value of the field (will be copied).
 633 **              flags -- flags to add to h_flags.
 634 **              e -- envelope.
 635 **              space -- add leading space?
 636 **
 637 **      Returns:
 638 **              none.
 639 **
 640 **      Side Effects:
 641 **              inserts the field on the list of headers for this envelope.
 642 **
 643 **      Notes:
 644 **              - field and value must be in internal format, i.e.,
 645 **              metacharacters must be "quoted", see quote_internal_chars().
 646 **              - the header list contains headers that might not be
 647 **              sent "out" (see putheader(): "skip"), hence there is no
 648 **              reliable way to insert a header at an exact position
 649 **              (except at the front or end).
 650 */
 651
 652 void
 653 insheader(idx, field, value, flags, e, space)
 654         int idx;
 655         char *field;
 656         char *value;
 657         int flags;
 658         ENVELOPE *e;
 659         bool space;
 660 {
 661         HDR *h, *srch, *last = NULL;
 662
 663         /* allocate space for new header */
 664         h = allocheader(field, value, flags, e->e_rpool, space);
 665
 666         /* find insertion position */
 667         for (srch = e->e_header; srch != NULL && idx > 0;
 668              srch = srch->h_link, idx--)
 669                 last = srch;
 670
 671         if (e->e_header == NULL)
 672         {
 673                 e->e_header = h;
 674                 h->h_link = NULL;
 675         }
 676         else if (srch == NULL)
 677         {
 678                 SM_ASSERT(last != NULL);
 679                 last->h_link = h;
 680                 h->h_link = NULL;
 681         }
 682         else
 683         {
 684                 h->h_link = srch->h_link;
 685                 srch->h_link = h;
 686         }
 687 }
 688
 689 /*
 690 **  HVALUE -- return value of a header.
 691 **
 692 **      Only "real" fields (i.e., ones that have not been supplied
 693 **      as a default) are used.
 694 **
 695 **      Parameters:
 696 **              field -- the field name.
 697 **              header -- the header list.
 698 **
 699 **      Returns:
 700 **              pointer to the value part (internal format).
 701 **              NULL if not found.
 702 **
 703 **      Side Effects:
 704 **              none.
 705 */
 706
 707 char *
 708 hvalue(field, header)
 709         char *field;
 710         HDR *header;
 711 {
 712         register HDR *h;
 713
 714         for (h = header; h != NULL; h = h->h_link)
 715         {
 716                 if (!bitset(H_DEFAULT, h->h_flags) &&
 717                     sm_strcasecmp(h->h_field, field) == 0)
 718                         return h->h_value;
 719         }
 720         return NULL;
 721 }
 722
 723 /*
 724 **  ISHEADER -- predicate telling if argument is a header.
 725 **
 726 **      A line is a header if it has a single word followed by
 727 **      optional white space followed by a colon.
 728 **
 729 **      Header fields beginning with two dashes, although technically
 730 **      permitted by RFC822, are automatically rejected in order
 731 **      to make MIME work out.  Without this we could have a technically
 732 **      legal header such as ``--"foo:bar"'' that would also be a legal
 733 **      MIME separator.
 734 **
 735 **      Parameters:
 736 **              h -- string to check for possible headerness.
 737 **
 738 **      Returns:
 739 **              true if h is a header.
 740 **              false otherwise.
 741 **
 742 **      Side Effects:
 743 **              none.
 744 */
 745
 746 bool
 747 isheader(h)
 748         char *h;
 749 {
 750         char *s;
 751
 752         s = h;
 753         if (s[0] == '-' && s[1] == '-')
 754                 return false;
 755
 756         while (*s > ' ' && *s != ':' && *s != '\0')
 757                 s++;
 758
 759         if (h == s)
 760                 return false;
 761
 762         /* following technically violates RFC822 */
 763         while (isascii(*s) && isspace(*s))
 764                 s++;
 765
 766         return (*s == ':');
 767 }
 768
 769 /*
 770 **  EATHEADER -- run through the stored header and extract info.
 771 **
 772 **      Parameters:
 773 **              e -- the envelope to process.
 774 **              full -- if set, do full processing (e.g., compute
 775 **                      message priority).  This should not be set
 776 **                      when reading a queue file because some info
 777 **                      needed to compute the priority is wrong.
 778 **              log -- call logsender()?
 779 **
 780 **      Returns:
 781 **              none.
 782 **
 783 **      Side Effects:
 784 **              Sets a bunch of global variables from information
 785 **                      in the collected header.
 786 */
 787
 788 void
 789 eatheader(e, full, log)
 790         register ENVELOPE *e;
 791         bool full;
 792         bool log;
 793 {
 794         register HDR *h;
 795         register char *p;
 796         int hopcnt = 0;
 797         char buf[MAXLINE];
 798
 799         /*
 800         **  Set up macros for possible expansion in headers.
 801         */
 802
 803         macdefine(&e->e_macro, A_PERM, 'f', e->e_sender);
 804         macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
 805         if (e->e_origrcpt != NULL && *e->e_origrcpt != '\0')
 806                 macdefine(&e->e_macro, A_PERM, 'u', e->e_origrcpt);
 807         else
 808                 macdefine(&e->e_macro, A_PERM, 'u', NULL);
 809
 810         /* full name of from person */
 811         p = hvalue("full-name", e->e_header);
 812         if (p != NULL)
 813         {
 814                 if (!rfc822_string(p))
 815                 {
 816                         /*
 817                         **  Quote a full name with special characters
 818                         **  as a comment so crackaddr() doesn't destroy
 819                         **  the name portion of the address.
 820                         */
 821
 822                         p = addquotes(p, e->e_rpool);
 823                 }
 824                 macdefine(&e->e_macro, A_PERM, 'x', p);
 825         }
 826
 827         if (tTd(32, 1))
 828                 sm_dprintf("----- collected header -----\n");
 829         e->e_msgid = NULL;
 830         for (h = e->e_header; h != NULL; h = h->h_link)
 831         {
 832                 if (tTd(32, 1))
 833                         sm_dprintf("%s:", h->h_field);
 834                 if (h->h_value == NULL)
 835                 {
 836                         if (tTd(32, 1))
 837                                 sm_dprintf("<NULL>\n");
 838                         continue;
 839                 }
 840
 841                 /* do early binding */
 842                 if (bitset(H_DEFAULT, h->h_flags) &&
 843                     !bitset(H_BINDLATE, h->h_flags))
 844                 {
 845                         if (tTd(32, 1))
 846                         {
 847                                 sm_dprintf("(");
 848                                 xputs(sm_debug_file(), h->h_value);
 849                                 sm_dprintf(") ");
 850                         }
 851                         expand(h->h_value, buf, sizeof(buf), e);
 852                         if (buf[0] != '\0' &&
 853                             (buf[0] != ' ' || buf[1] != '\0'))
 854                         {
 855                                 if (bitset(H_FROM, h->h_flags))
 856                                         expand(crackaddr(buf, e),
 857                                                buf, sizeof(buf), e);
 858                                 h->h_value = sm_rpool_strdup_x(e->e_rpool, buf);
 859                                 h->h_flags &= ~H_DEFAULT;
 860                         }
 861                 }
 862                 if (tTd(32, 1))
 863                 {
 864                         xputs(sm_debug_file(), h->h_value);
 865                         sm_dprintf("\n");
 866                 }
 867
 868                 /* count the number of times it has been processed */
 869                 if (bitset(H_TRACE, h->h_flags))
 870                         hopcnt++;
 871
 872                 /* send to this person if we so desire */
 873                 if (GrabTo && bitset(H_RCPT, h->h_flags) &&
 874                     !bitset(H_DEFAULT, h->h_flags) &&
 875                     (!bitset(EF_RESENT, e->e_flags) ||
 876                      bitset(H_RESENT, h->h_flags)))
 877                 {
 878 #if 0
 879                         int saveflags = e->e_flags;
 880 #endif /* 0 */
 881
 882                         (void) sendtolist(denlstring(h->h_value, true, false),
 883                                           NULLADDR, &e->e_sendqueue, 0, e);
 884
 885 #if 0
 886                         /*
 887                         **  Change functionality so a fatal error on an
 888                         **  address doesn't affect the entire envelope.
 889                         */
 890
 891                         /* delete fatal errors generated by this address */
 892                         if (!bitset(EF_FATALERRS, saveflags))
 893                                 e->e_flags &= ~EF_FATALERRS;
 894 #endif /* 0 */
 895                 }
 896
 897                 /* save the message-id for logging */
 898                 p = "resent-message-id";
 899                 if (!bitset(EF_RESENT, e->e_flags))
 900                         p += 7;
 901                 if (sm_strcasecmp(h->h_field, p) == 0)
 902                 {
 903                         e->e_msgid = h->h_value;
 904                         while (isascii(*e->e_msgid) && isspace(*e->e_msgid))
 905                                 e->e_msgid++;
 906                         macdefine(&e->e_macro, A_PERM, macid("{msg_id}"),
 907                                   e->e_msgid);
 908                 }
 909         }
 910         if (tTd(32, 1))
 911                 sm_dprintf("----------------------------\n");
 912
 913         /* if we are just verifying (that is, sendmail -t -bv), drop out now */
 914         if (OpMode == MD_VERIFY)
 915                 return;
 916
 917         /* store hop count */
 918         if (hopcnt > e->e_hopcount)
 919         {
 920                 e->e_hopcount = hopcnt;
 921                 (void) sm_snprintf(buf, sizeof(buf), "%d", e->e_hopcount);
 922                 macdefine(&e->e_macro, A_TEMP, 'c', buf);
 923         }
 924
 925         /* message priority */
 926         p = hvalue("precedence", e->e_header);
 927         if (p != NULL)
 928                 e->e_class = priencode(p);
 929         if (e->e_class < 0)
 930                 e->e_timeoutclass = TOC_NONURGENT;
 931         else if (e->e_class > 0)
 932                 e->e_timeoutclass = TOC_URGENT;
 933         if (full)
 934         {
 935                 e->e_msgpriority = e->e_msgsize
 936                                  - e->e_class * WkClassFact
 937                                  + e->e_nrcpts * WkRecipFact;
 938         }
 939
 940         /* check for DSN to properly set e_timeoutclass */
 941         p = hvalue("content-type", e->e_header);
 942         if (p != NULL)
 943         {
 944                 bool oldsupr;
 945                 char **pvp;
 946                 char pvpbuf[MAXLINE];
 947                 extern unsigned char MimeTokenTab[256];
 948
 949                 /* tokenize header */
 950                 oldsupr = SuprErrs;
 951                 SuprErrs = true;
 952                 pvp = prescan(p, '\0', pvpbuf, sizeof(pvpbuf), NULL,
 953                               MimeTokenTab, false);
 954                 SuprErrs = oldsupr;
 955
 956                 /* Check if multipart/report */
 957                 if (pvp != NULL && pvp[0] != NULL &&
 958                     pvp[1] != NULL && pvp[2] != NULL &&
 959                     sm_strcasecmp(*pvp++, "multipart") == 0 &&
 960                     strcmp(*pvp++, "/") == 0 &&
 961                     sm_strcasecmp(*pvp++, "report") == 0)
 962                 {
 963                         /* Look for report-type=delivery-status */
 964                         while (*pvp != NULL)
 965                         {
 966                                 /* skip to semicolon separator */
 967                                 while (*pvp != NULL && strcmp(*pvp, ";") != 0)
 968                                         pvp++;
 969
 970                                 /* skip semicolon */
 971                                 if (*pvp++ == NULL || *pvp == NULL)
 972                                         break;
 973
 974                                 /* look for report-type */
 975                                 if (sm_strcasecmp(*pvp++, "report-type") != 0)
 976                                         continue;
 977
 978                                 /* skip equal */
 979                                 if (*pvp == NULL || strcmp(*pvp, "=") != 0)
 980                                         continue;
 981
 982                                 /* check value */
 983                                 if (*++pvp != NULL &&
 984                                     sm_strcasecmp(*pvp,
 985                                                   "delivery-status") == 0)
 986                                         e->e_timeoutclass = TOC_DSN;
 987
 988                                 /* found report-type, no need to continue */
 989                                 break;
 990                         }
 991                 }
 992         }
 993
 994         /* message timeout priority */
 995         p = hvalue("priority", e->e_header);
 996         if (p != NULL)
 997         {
 998                 /* (this should be in the configuration file) */
 999                 if (sm_strcasecmp(p, "urgent") == 0)
1000                         e->e_timeoutclass = TOC_URGENT;
1001                 else if (sm_strcasecmp(p, "normal") == 0)
1002                         e->e_timeoutclass = TOC_NORMAL;
1003                 else if (sm_strcasecmp(p, "non-urgent") == 0)
1004                         e->e_timeoutclass = TOC_NONURGENT;
1005                 else if (bitset(EF_RESPONSE, e->e_flags))
1006                         e->e_timeoutclass = TOC_DSN;
1007         }
1008         else if (bitset(EF_RESPONSE, e->e_flags))
1009                 e->e_timeoutclass = TOC_DSN;
1010
1011         /* date message originated */
1012         p = hvalue("posted-date", e->e_header);
1013         if (p == NULL)
1014                 p = hvalue("date", e->e_header);
1015         if (p != NULL)
1016                 macdefine(&e->e_macro, A_PERM, 'a', p);
1017
1018         /* check to see if this is a MIME message */
1019         if ((e->e_bodytype != NULL &&
1020              sm_strcasecmp(e->e_bodytype, "8BITMIME") == 0) ||
1021             hvalue("MIME-Version", e->e_header) != NULL)
1022         {
1023                 e->e_flags |= EF_IS_MIME;
1024                 if (HasEightBits)
1025                         e->e_bodytype = "8BITMIME";
1026         }
1027         else if ((p = hvalue("Content-Type", e->e_header)) != NULL)
1028         {
1029                 /* this may be an RFC 1049 message */
1030                 p = strpbrk(p, ";/");
1031                 if (p == NULL || *p == ';')
1032                 {
1033                         /* yep, it is */
1034                         e->e_flags |= EF_DONT_MIME;
1035                 }
1036         }
1037
1038         /*
1039         **  From person in antiquated ARPANET mode
1040         **      required by UK Grey Book e-mail gateways (sigh)
1041         */
1042
1043         if (OpMode == MD_ARPAFTP)
1044         {
1045                 register struct hdrinfo *hi;
1046
1047                 for (hi = HdrInfo; hi->hi_field != NULL; hi++)
1048                 {
1049                         if (bitset(H_FROM, hi->hi_flags) &&
1050                             (!bitset(H_RESENT, hi->hi_flags) ||
1051                              bitset(EF_RESENT, e->e_flags)) &&
1052                             (p = hvalue(hi->hi_field, e->e_header)) != NULL)
1053                                 break;
1054                 }
1055                 if (hi->hi_field != NULL)
1056                 {
1057                         if (tTd(32, 2))
1058                                 sm_dprintf("eatheader: setsender(*%s == %s)\n",
1059                                         hi->hi_field, p);
1060                         setsender(p, e, NULL, '\0', true);
1061                 }
1062         }
1063
1064         /*
1065         **  Log collection information.
1066         */
1067
1068         if (log && bitset(EF_LOGSENDER, e->e_flags) && LogLevel > 4)
1069         {
1070                 logsender(e, e->e_msgid);
1071                 e->e_flags &= ~EF_LOGSENDER;
1072         }
1073 }
1074
1075 /*
1076 **  LOGSENDER -- log sender information
1077 **
1078 **      Parameters:
1079 **              e -- the envelope to log
1080 **              msgid -- the message id
1081 **
1082 **      Returns:
1083 **              none
1084 */
1085
1086 void
1087 logsender(e, msgid)
1088         register ENVELOPE *e;
1089         char *msgid;
1090 {
1091         char *name;
1092         register char *sbp;
1093         register char *p;
1094         char hbuf[MAXNAME + 1];
1095         char sbuf[MAXLINE + 1];
1096         char mbuf[MAXNAME + 1];
1097
1098         /* don't allow newlines in the message-id */
1099         /* XXX do we still need this? sm_syslog() replaces control chars */
1100         if (msgid != NULL)
1101         {
1102                 size_t l;
1103
1104                 l = strlen(msgid);
1105                 if (l > sizeof(mbuf) - 1)
1106                         l = sizeof(mbuf) - 1;
1107                 memmove(mbuf, msgid, l);
1108                 mbuf[l] = '\0';
1109                 p = mbuf;
1110                 while ((p = strchr(p, '\n')) != NULL)
1111                         *p++ = ' ';
1112         }
1113
1114         if (bitset(EF_RESPONSE, e->e_flags))
1115                 name = "[RESPONSE]";
1116         else if ((name = macvalue('_', e)) != NULL)
1117                 /* EMPTY */
1118                 ;
1119         else if (RealHostName == NULL)
1120                 name = "localhost";
1121         else if (RealHostName[0] == '[')
1122                 name = RealHostName;
1123         else
1124         {
1125                 name = hbuf;
1126                 (void) sm_snprintf(hbuf, sizeof(hbuf), "%.80s", RealHostName);
1127                 if (RealHostAddr.sa.sa_family != 0)
1128                 {
1129                         p = &hbuf[strlen(hbuf)];
1130                         (void) sm_snprintf(p, SPACELEFT(hbuf, p),
1131                                            " (%.100s)",
1132                                            anynet_ntoa(&RealHostAddr));
1133                 }
1134         }
1135
1136         /* some versions of syslog only take 5 printf args */
1137 #if (SYSLOG_BUFSIZE) >= 256
1138         sbp = sbuf;
1139         (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1140                 "from=%.200s, size=%ld, class=%d, nrcpts=%d",
1141                 e->e_from.q_paddr == NULL ? "<NONE>" : e->e_from.q_paddr,
1142                 e->e_msgsize, e->e_class, e->e_nrcpts);
1143         sbp += strlen(sbp);
1144         if (msgid != NULL)
1145         {
1146                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1147                                 ", msgid=%.100s", mbuf);
1148                 sbp += strlen(sbp);
1149         }
1150         if (e->e_bodytype != NULL)
1151         {
1152                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1153                                 ", bodytype=%.20s", e->e_bodytype);
1154                 sbp += strlen(sbp);
1155         }
1156         p = macvalue('r', e);
1157         if (p != NULL)
1158         {
1159                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1160                                 ", proto=%.20s", p);
1161                 sbp += strlen(sbp);
1162         }
1163         p = macvalue(macid("{daemon_name}"), e);
1164         if (p != NULL)
1165         {
1166                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1167                                 ", daemon=%.20s", p);
1168                 sbp += strlen(sbp);
1169         }
1170         sm_syslog(LOG_INFO, e->e_id, "%.850s, relay=%s", sbuf, name);
1171
1172 #else /* (SYSLOG_BUFSIZE) >= 256 */
1173
1174         sm_syslog(LOG_INFO, e->e_id,
1175                   "from=%s",
1176                   e->e_from.q_paddr == NULL ? "<NONE>"
1177                                             : shortenstring(e->e_from.q_paddr,
1178                                                             83));
1179         sm_syslog(LOG_INFO, e->e_id,
1180                   "size=%ld, class=%ld, nrcpts=%d",
1181                   e->e_msgsize, e->e_class, e->e_nrcpts);
1182         if (msgid != NULL)
1183                 sm_syslog(LOG_INFO, e->e_id,
1184                           "msgid=%s",
1185                           shortenstring(mbuf, 83));
1186         sbp = sbuf;
1187         *sbp = '\0';
1188         if (e->e_bodytype != NULL)
1189         {
1190                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1191                                 "bodytype=%.20s, ", e->e_bodytype);
1192                 sbp += strlen(sbp);
1193         }
1194         p = macvalue('r', e);
1195         if (p != NULL)
1196         {
1197                 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1198                                 "proto=%.20s, ", p);
1199                 sbp += strlen(sbp);
1200         }
1201         sm_syslog(LOG_INFO, e->e_id,
1202                   "%.400srelay=%s", sbuf, name);
1203 #endif /* (SYSLOG_BUFSIZE) >= 256 */
1204 }
1205
1206 /*
1207 **  PRIENCODE -- encode external priority names into internal values.
1208 **
1209 **      Parameters:
1210 **              p -- priority in ascii.
1211 **
1212 **      Returns:
1213 **              priority as a numeric level.
1214 **
1215 **      Side Effects:
1216 **              none.
1217 */
1218
1219 static int
1220 priencode(p)
1221         char *p;
1222 {
1223         register int i;
1224
1225         for (i = 0; i < NumPriorities; i++)
1226         {
1227                 if (sm_strcasecmp(p, Priorities[i].pri_name) == 0)
1228                         return Priorities[i].pri_val;
1229         }
1230
1231         /* unknown priority */
1232         return 0;
1233 }
1234
1235 /*
1236 **  CRACKADDR -- parse an address and turn it into a macro
1237 **
1238 **      This doesn't actually parse the address -- it just extracts
1239 **      it and replaces it with "$g".  The parse is totally ad hoc
1240 **      and isn't even guaranteed to leave something syntactically
1241 **      identical to what it started with.  However, it does leave
1242 **      something semantically identical if possible, else at least
1243 **      syntactically correct.
1244 **
1245 **      For example, it changes "Real Name <real@example.com> (Comment)"
1246 **      to "Real Name <$g> (Comment)".
1247 **
1248 **      This algorithm has been cleaned up to handle a wider range
1249 **      of cases -- notably quoted and backslash escaped strings.
1250 **      This modification makes it substantially better at preserving
1251 **      the original syntax.
1252 **
1253 **      Parameters:
1254 **              addr -- the address to be cracked.
1255 **              e -- the current envelope.
1256 **
1257 **      Returns:
1258 **              a pointer to the new version.
1259 **
1260 **      Side Effects:
1261 **              none.
1262 **
1263 **      Warning:
1264 **              The return value is saved in local storage and should
1265 **              be copied if it is to be reused.
1266 */
1267
1268 #define SM_HAVE_ROOM            ((bp < buflim) && (buflim <= bufend))
1269
1270 /*
1271 **  Append a character to bp if we have room.
1272 **  If not, punt and return $g.
1273 */
1274
1275 #define SM_APPEND_CHAR(c)                                       \
1276         do                                                      \
1277         {                                                       \
1278                 if (SM_HAVE_ROOM)                               \
1279                         *bp++ = (c);                            \
1280                 else                                            \
1281                         goto returng;                           \
1282         } while (0)
1283
1284 #if MAXNAME < 10
1285 ERROR MAXNAME must be at least 10
1286 #endif /* MAXNAME < 10 */
1287
1288 char *
1289 crackaddr(addr, e)
1290         register char *addr;
1291         ENVELOPE *e;
1292 {
1293         register char *p;
1294         register char c;
1295         int cmtlev;                     /* comment level in input string */
1296         int realcmtlev;                 /* comment level in output string */
1297         int anglelev;                   /* angle level in input string */
1298         int copylev;                    /* 0 == in address, >0 copying */
1299         int bracklev;                   /* bracket level for IPv6 addr check */
1300         bool addangle;                  /* put closing angle in output */
1301         bool qmode;                     /* quoting in original string? */
1302         bool realqmode;                 /* quoting in output string? */
1303         bool putgmac = false;           /* already wrote $g */
1304         bool quoteit = false;           /* need to quote next character */
1305         bool gotangle = false;          /* found first '<' */
1306         bool gotcolon = false;          /* found a ':' */
1307         register char *bp;
1308         char *buflim;
1309         char *bufhead;
1310         char *addrhead;
1311         char *bufend;
1312         static char buf[MAXNAME + 1];
1313
1314         if (tTd(33, 1))
1315                 sm_dprintf("crackaddr(%s)\n", addr);
1316
1317         buflim = bufend = &buf[sizeof(buf) - 1];
1318         bp = bufhead = buf;
1319
1320         /* skip over leading spaces but preserve them */
1321         while (*addr != '\0' && isascii(*addr) && isspace(*addr))
1322         {
1323                 SM_APPEND_CHAR(*addr);
1324                 addr++;
1325         }
1326         bufhead = bp;
1327
1328         /*
1329         **  Start by assuming we have no angle brackets.  This will be
1330         **  adjusted later if we find them.
1331         */
1332
1333         p = addrhead = addr;
1334         copylev = anglelev = cmtlev = realcmtlev = 0;
1335         bracklev = 0;
1336         qmode = realqmode = addangle = false;
1337
1338         while ((c = *p++) != '\0')
1339         {
1340                 /*
1341                 **  Try to keep legal syntax using spare buffer space
1342                 **  (maintained by buflim).
1343                 */
1344
1345                 if (copylev > 0)
1346                         SM_APPEND_CHAR(c);
1347
1348                 /* check for backslash escapes */
1349                 if (c == '\\')
1350                 {
1351                         /* arrange to quote the address */
1352                         if (cmtlev <= 0 && !qmode)
1353                                 quoteit = true;
1354
1355                         if ((c = *p++) == '\0')
1356                         {
1357                                 /* too far */
1358                                 p--;
1359                                 goto putg;
1360                         }
1361                         if (copylev > 0)
1362                                 SM_APPEND_CHAR(c);
1363                         goto putg;
1364                 }
1365
1366                 /* check for quoted strings */
1367                 if (c == '"' && cmtlev <= 0)
1368                 {
1369                         qmode = !qmode;
1370                         if (copylev > 0 && SM_HAVE_ROOM)
1371                         {
1372                                 if (realqmode)
1373                                         buflim--;
1374                                 else
1375                                         buflim++;
1376                                 realqmode = !realqmode;
1377                         }
1378                         continue;
1379                 }
1380                 if (qmode)
1381                         goto putg;
1382
1383                 /* check for comments */
1384                 if (c == '(')
1385                 {
1386                         cmtlev++;
1387
1388                         /* allow space for closing paren */
1389                         if (SM_HAVE_ROOM)
1390                         {
1391                                 buflim--;
1392                                 realcmtlev++;
1393                                 if (copylev++ <= 0)
1394                                 {
1395                                         if (bp != bufhead)
1396                                                 SM_APPEND_CHAR(' ');
1397                                         SM_APPEND_CHAR(c);
1398                                 }
1399                         }
1400                 }
1401                 if (cmtlev > 0)
1402                 {
1403                         if (c == ')')
1404                         {
1405                                 cmtlev--;
1406                                 copylev--;
1407                                 if (SM_HAVE_ROOM)
1408                                 {
1409                                         realcmtlev--;
1410                                         buflim++;
1411                                 }
1412                         }
1413                         continue;
1414                 }
1415                 else if (c == ')')
1416                 {
1417                         /* syntax error: unmatched ) */
1418                         if (copylev > 0 && SM_HAVE_ROOM && bp > bufhead)
1419                                 bp--;
1420                 }
1421
1422                 /* count nesting on [ ... ] (for IPv6 domain literals) */
1423                 if (c == '[')
1424                         bracklev++;
1425                 else if (c == ']')
1426                         bracklev--;
1427
1428                 /* check for group: list; syntax */
1429                 if (c == ':' && anglelev <= 0 && bracklev <= 0 &&
1430                     !gotcolon && !ColonOkInAddr)
1431                 {
1432                         register char *q;
1433
1434                         /*
1435                         **  Check for DECnet phase IV ``::'' (host::user)
1436                         **  or DECnet phase V ``:.'' syntaxes.  The latter
1437                         **  covers ``user@DEC:.tay.myhost'' and
1438                         **  ``DEC:.tay.myhost::user'' syntaxes (bletch).
1439                         */
1440
1441                         if (*p == ':' || *p == '.')
1442                         {
1443                                 if (cmtlev <= 0 && !qmode)
1444                                         quoteit = true;
1445                                 if (copylev > 0)
1446                                 {
1447                                         SM_APPEND_CHAR(c);
1448                                         SM_APPEND_CHAR(*p);
1449                                 }
1450                                 p++;
1451                                 goto putg;
1452                         }
1453
1454                         gotcolon = true;
1455
1456                         bp = bufhead;
1457                         if (quoteit)
1458                         {
1459                                 SM_APPEND_CHAR('"');
1460
1461                                 /* back up over the ':' and any spaces */
1462                                 --p;
1463                                 while (p > addr &&
1464                                        isascii(*--p) && isspace(*p))
1465                                         continue;
1466                                 p++;
1467                         }
1468                         for (q = addrhead; q < p; )
1469                         {
1470                                 c = *q++;
1471                                 if (quoteit && c == '"')
1472                                         SM_APPEND_CHAR('\\');
1473                                 SM_APPEND_CHAR(c);
1474                         }
1475                         if (quoteit)
1476                         {
1477                                 if (bp == &bufhead[1])
1478                                         bp--;
1479                                 else
1480                                         SM_APPEND_CHAR('"');
1481                                 while ((c = *p++) != ':')
1482                                         SM_APPEND_CHAR(c);
1483                                 SM_APPEND_CHAR(c);
1484                         }
1485
1486                         /* any trailing white space is part of group: */
1487                         while (isascii(*p) && isspace(*p))
1488                         {
1489                                 SM_APPEND_CHAR(*p);
1490                                 p++;
1491                         }
1492                         copylev = 0;
1493                         putgmac = quoteit = false;
1494                         bufhead = bp;
1495                         addrhead = p;
1496                         continue;
1497                 }
1498
1499                 if (c == ';' && copylev <= 0 && !ColonOkInAddr)
1500                         SM_APPEND_CHAR(c);
1501
1502                 /* check for characters that may have to be quoted */
1503                 if (strchr(MustQuoteChars, c) != NULL)
1504                 {
1505                         /*
1506                         **  If these occur as the phrase part of a <>
1507                         **  construct, but are not inside of () or already
1508                         **  quoted, they will have to be quoted.  Note that
1509                         **  now (but don't actually do the quoting).
1510                         */
1511
1512                         if (cmtlev <= 0 && !qmode)
1513                                 quoteit = true;
1514                 }
1515
1516                 /* check for angle brackets */
1517                 if (c == '<')
1518                 {
1519                         register char *q;
1520
1521                         /* assume first of two angles is bogus */
1522                         if (gotangle)
1523                                 quoteit = true;
1524                         gotangle = true;
1525
1526                         /* oops -- have to change our mind */
1527                         anglelev = 1;
1528                         if (SM_HAVE_ROOM)
1529                         {
1530                                 if (!addangle)
1531                                         buflim--;
1532                                 addangle = true;
1533                         }
1534
1535                         bp = bufhead;
1536                         if (quoteit)
1537                         {
1538                                 SM_APPEND_CHAR('"');
1539
1540                                 /* back up over the '<' and any spaces */
1541                                 --p;
1542                                 while (p > addr &&
1543                                        isascii(*--p) && isspace(*p))
1544                                         continue;
1545                                 p++;
1546                         }
1547                         for (q = addrhead; q < p; )
1548                         {
1549                                 c = *q++;
1550                                 if (quoteit && c == '"')
1551                                 {
1552                                         SM_APPEND_CHAR('\\');
1553                                         SM_APPEND_CHAR(c);
1554                                 }
1555                                 else
1556                                         SM_APPEND_CHAR(c);
1557                         }
1558                         if (quoteit)
1559                         {
1560                                 if (bp == &buf[1])
1561                                         bp--;
1562                                 else
1563                                         SM_APPEND_CHAR('"');
1564                                 while ((c = *p++) != '<')
1565                                         SM_APPEND_CHAR(c);
1566                                 SM_APPEND_CHAR(c);
1567                         }
1568                         copylev = 0;
1569                         putgmac = quoteit = false;
1570                         continue;
1571                 }
1572
1573                 if (c == '>')
1574                 {
1575                         if (anglelev > 0)
1576                         {
1577                                 anglelev--;
1578                                 if (SM_HAVE_ROOM)
1579                                 {
1580                                         if (addangle)
1581                                                 buflim++;
1582                                         addangle = false;
1583                                 }
1584                         }
1585                         else if (SM_HAVE_ROOM)
1586                         {
1587                                 /* syntax error: unmatched > */
1588                                 if (copylev > 0 && bp > bufhead)
1589                                         bp--;
1590                                 quoteit = true;
1591                                 continue;
1592                         }
1593                         if (copylev++ <= 0)
1594                                 SM_APPEND_CHAR(c);
1595                         continue;
1596                 }
1597
1598                 /* must be a real address character */
1599         putg:
1600                 if (copylev <= 0 && !putgmac)
1601                 {
1602                         if (bp > buf && bp[-1] == ')')
1603                                 SM_APPEND_CHAR(' ');
1604                         SM_APPEND_CHAR(MACROEXPAND);
1605                         SM_APPEND_CHAR('g');
1606                         putgmac = true;
1607                 }
1608         }
1609
1610         /* repair any syntactic damage */
1611         if (realqmode && bp < bufend)
1612                 *bp++ = '"';
1613         while (realcmtlev-- > 0 && bp < bufend)
1614                 *bp++ = ')';
1615         if (addangle && bp < bufend)
1616                 *bp++ = '>';
1617         *bp = '\0';
1618         if (bp < bufend)
1619                 goto success;
1620
1621  returng:
1622         /* String too long, punt */
1623         buf[0] = '<';
1624         buf[1] = MACROEXPAND;
1625         buf[2]= 'g';
1626         buf[3] = '>';
1627         buf[4]= '\0';
1628         sm_syslog(LOG_ALERT, e->e_id,
1629                   "Dropped invalid comments from header address");
1630
1631  success:
1632         if (tTd(33, 1))
1633         {
1634                 sm_dprintf("crackaddr=>`");
1635                 xputs(sm_debug_file(), buf);
1636                 sm_dprintf("'\n");
1637         }
1638         return buf;
1639 }
1640
1641 /*
1642 **  PUTHEADER -- put the header part of a message from the in-core copy
1643 **
1644 **      Parameters:
1645 **              mci -- the connection information.
1646 **              hdr -- the header to put.
1647 **              e -- envelope to use.
1648 **              flags -- MIME conversion flags.
1649 **
1650 **      Returns:
1651 **              true iff header part was written successfully
1652 **
1653 **      Side Effects:
1654 **              none.
1655 */
1656
1657 bool
1658 putheader(mci, hdr, e, flags)
1659         register MCI *mci;
1660         HDR *hdr;
1661         register ENVELOPE *e;
1662         int flags;
1663 {
1664         register HDR *h;
1665         char buf[SM_MAX(MAXLINE,BUFSIZ)];
1666         char obuf[MAXLINE];
1667
1668         if (tTd(34, 1))
1669                 sm_dprintf("--- putheader, mailer = %s ---\n",
1670                         mci->mci_mailer->m_name);
1671
1672         /*
1673         **  If we're in MIME mode, we're not really in the header of the
1674         **  message, just the header of one of the parts of the body of
1675         **  the message.  Therefore MCIF_INHEADER should not be turned on.
1676         */
1677
1678         if (!bitset(MCIF_INMIME, mci->mci_flags))
1679                 mci->mci_flags |= MCIF_INHEADER;
1680
1681         for (h = hdr; h != NULL; h = h->h_link)
1682         {
1683                 register char *p = h->h_value;
1684                 char *q;
1685
1686                 if (tTd(34, 11))
1687                 {
1688                         sm_dprintf("  %s:", h->h_field);
1689                         xputs(sm_debug_file(), p);
1690                 }
1691
1692                 /* Skip empty headers */
1693                 if (h->h_value == NULL)
1694                         continue;
1695
1696                 /* heuristic shortening of MIME fields to avoid MUA overflows */
1697                 if (MaxMimeFieldLength > 0 &&
1698                     wordinclass(h->h_field,
1699                                 macid("{checkMIMEFieldHeaders}")))
1700                 {
1701                         size_t len;
1702
1703                         len = fix_mime_header(h, e);
1704                         if (len > 0)
1705                         {
1706                                 sm_syslog(LOG_ALERT, e->e_id,
1707                                           "Truncated MIME %s header due to field size (length = %ld) (possible attack)",
1708                                           h->h_field, (unsigned long) len);
1709                                 if (tTd(34, 11))
1710                                         sm_dprintf("  truncated MIME %s header due to field size  (length = %ld) (possible attack)\n",
1711                                                    h->h_field,
1712                                                    (unsigned long) len);
1713                         }
1714                 }
1715
1716                 if (MaxMimeHeaderLength > 0 &&
1717                     wordinclass(h->h_field,
1718                                 macid("{checkMIMETextHeaders}")))
1719                 {
1720                         size_t len;
1721
1722                         len = strlen(h->h_value);
1723                         if (len > (size_t) MaxMimeHeaderLength)
1724                         {
1725                                 h->h_value[MaxMimeHeaderLength - 1] = '\0';
1726                                 sm_syslog(LOG_ALERT, e->e_id,
1727                                           "Truncated long MIME %s header (length = %ld) (possible attack)",
1728                                           h->h_field, (unsigned long) len);
1729                                 if (tTd(34, 11))
1730                                         sm_dprintf("  truncated long MIME %s header (length = %ld) (possible attack)\n",
1731                                                    h->h_field,
1732                                                    (unsigned long) len);
1733                         }
1734                 }
1735
1736                 if (MaxMimeHeaderLength > 0 &&
1737                     wordinclass(h->h_field,
1738                                 macid("{checkMIMEHeaders}")))
1739                 {
1740                         size_t len;
1741
1742                         len = strlen(h->h_value);
1743                         if (shorten_rfc822_string(h->h_value,
1744                                                   MaxMimeHeaderLength))
1745                         {
1746                                 if (len < MaxMimeHeaderLength)
1747                                 {
1748                                         /* we only rebalanced a bogus header */
1749                                         sm_syslog(LOG_ALERT, e->e_id,
1750                                                   "Fixed MIME %s header (possible attack)",
1751                                                   h->h_field);
1752                                         if (tTd(34, 11))
1753                                                 sm_dprintf("  fixed MIME %s header (possible attack)\n",
1754                                                            h->h_field);
1755                                 }
1756                                 else
1757                                 {
1758                                         /* we actually shortened header */
1759                                         sm_syslog(LOG_ALERT, e->e_id,
1760                                                   "Truncated long MIME %s header (length = %ld) (possible attack)",
1761                                                   h->h_field,
1762                                                   (unsigned long) len);
1763                                         if (tTd(34, 11))
1764                                                 sm_dprintf("  truncated long MIME %s header (length = %ld) (possible attack)\n",
1765                                                            h->h_field,
1766                                                            (unsigned long) len);
1767                                 }
1768                         }
1769                 }
1770
1771                 /*
1772                 **  Suppress Content-Transfer-Encoding: if we are MIMEing
1773                 **  and we are potentially converting from 8 bit to 7 bit
1774                 **  MIME.  If converting, add a new CTE header in
1775                 **  mime8to7().
1776                 */
1777
1778                 if (bitset(H_CTE, h->h_flags) &&
1779                     bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME,
1780                            mci->mci_flags) &&
1781                     !bitset(M87F_NO8TO7, flags))
1782                 {
1783                         if (tTd(34, 11))
1784                                 sm_dprintf(" (skipped (content-transfer-encoding))\n");
1785                         continue;
1786                 }
1787
1788                 if (bitset(MCIF_INMIME, mci->mci_flags))
1789                 {
1790                         if (tTd(34, 11))
1791                                 sm_dprintf("\n");
1792                         if (!put_vanilla_header(h, p, mci))
1793                                 goto writeerr;
1794                         continue;
1795                 }
1796
1797                 if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
1798                     !bitintersect(h->h_mflags, mci->mci_mailer->m_flags) &&
1799                     (h->h_macro == '\0' ||
1800                      (q = macvalue(bitidx(h->h_macro), e)) == NULL ||
1801                      *q == '\0'))
1802                 {
1803                         if (tTd(34, 11))
1804                                 sm_dprintf(" (skipped)\n");
1805                         continue;
1806                 }
1807
1808                 /* handle Resent-... headers specially */
1809                 if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
1810                 {
1811                         if (tTd(34, 11))
1812                                 sm_dprintf(" (skipped (resent))\n");
1813                         continue;
1814                 }
1815
1816                 /* suppress return receipts if requested */
1817                 if (bitset(H_RECEIPTTO, h->h_flags) &&
1818                     (RrtImpliesDsn || bitset(EF_NORECEIPT, e->e_flags)))
1819                 {
1820                         if (tTd(34, 11))
1821                                 sm_dprintf(" (skipped (receipt))\n");
1822                         continue;
1823                 }
1824
1825                 /* macro expand value if generated internally */
1826                 if (bitset(H_DEFAULT, h->h_flags) ||
1827                     bitset(H_BINDLATE, h->h_flags))
1828                 {
1829                         expand(p, buf, sizeof(buf), e);
1830                         p = buf;
1831                         if (*p == '\0')
1832                         {
1833                                 if (tTd(34, 11))
1834                                         sm_dprintf(" (skipped -- null value)\n");
1835                                 continue;
1836                         }
1837                 }
1838
1839                 if (bitset(H_BCC, h->h_flags))
1840                 {
1841                         /* Bcc: field -- either truncate or delete */
1842                         if (bitset(EF_DELETE_BCC, e->e_flags))
1843                         {
1844                                 if (tTd(34, 11))
1845                                         sm_dprintf(" (skipped -- bcc)\n");
1846                         }
1847                         else
1848                         {
1849                                 /* no other recipient headers: truncate value */
1850                                 (void) sm_strlcpyn(obuf, sizeof(obuf), 2,
1851                                                    h->h_field, ":");
1852                                 if (!putline(obuf, mci))
1853                                         goto writeerr;
1854                         }
1855                         continue;
1856                 }
1857
1858                 if (tTd(34, 11))
1859                         sm_dprintf("\n");
1860
1861                 if (bitset(H_FROM|H_RCPT, h->h_flags))
1862                 {
1863                         /* address field */
1864                         bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags);
1865
1866                         if (bitset(H_FROM, h->h_flags))
1867                                 oldstyle = false;
1868                         commaize(h, p, oldstyle, mci, e);
1869                 }
1870                 else
1871                 {
1872                         if (!put_vanilla_header(h, p, mci))
1873                                 goto writeerr;
1874                 }
1875         }
1876
1877         /*
1878         **  If we are converting this to a MIME message, add the
1879         **  MIME headers (but not in MIME mode!).
1880         */
1881
1882 #if MIME8TO7
1883         if (bitset(MM_MIME8BIT, MimeMode) &&
1884             bitset(EF_HAS8BIT, e->e_flags) &&
1885             !bitset(EF_DONT_MIME, e->e_flags) &&
1886             !bitnset(M_8BITS, mci->mci_mailer->m_flags) &&
1887             !bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME, mci->mci_flags) &&
1888             hvalue("MIME-Version", e->e_header) == NULL)
1889         {
1890                 if (!putline("MIME-Version: 1.0", mci))
1891                         goto writeerr;
1892                 if (hvalue("Content-Type", e->e_header) == NULL)
1893                 {
1894                         (void) sm_snprintf(obuf, sizeof(obuf),
1895                                         "Content-Type: text/plain; charset=%s",
1896                                         defcharset(e));
1897                         if (!putline(obuf, mci))
1898                                 goto writeerr;
1899                 }
1900                 if (hvalue("Content-Transfer-Encoding", e->e_header) == NULL
1901                     && !putline("Content-Transfer-Encoding: 8bit", mci))
1902                         goto writeerr;
1903         }
1904 #endif /* MIME8TO7 */
1905         return true;
1906
1907   writeerr:
1908         return false;
1909 }
1910
1911 /*
1912 **  PUT_VANILLA_HEADER -- output a fairly ordinary header
1913 **
1914 **      Parameters:
1915 **              h -- the structure describing this header
1916 **              v -- the value of this header
1917 **              mci -- the connection info for output
1918 **
1919 **      Returns:
1920 **              true iff header was written successfully
1921 */
1922
1923 static bool
1924 put_vanilla_header(h, v, mci)
1925         HDR *h;
1926         char *v;
1927         MCI *mci;
1928 {
1929         register char *nlp;
1930         register char *obp;
1931         int putflags;
1932         char obuf[MAXLINE + 256];       /* additional length for h_field */
1933
1934         putflags = PXLF_HEADER | PXLF_STRIPMQUOTE;
1935         if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
1936                 putflags |= PXLF_STRIP8BIT;
1937         (void) sm_snprintf(obuf, sizeof(obuf), "%.200s:", h->h_field);
1938         obp = obuf + strlen(obuf);
1939         while ((nlp = strchr(v, '\n')) != NULL)
1940         {
1941                 int l;
1942
1943                 l = nlp - v;
1944
1945                 /*
1946                 **  XXX This is broken for SPACELEFT()==0
1947                 **  However, SPACELEFT() is always > 0 unless MAXLINE==1.
1948                 */
1949
1950                 if (SPACELEFT(obuf, obp) - 1 < (size_t) l)
1951                         l = SPACELEFT(obuf, obp) - 1;
1952
1953                 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s", l, v);
1954                 if (!putxline(obuf, strlen(obuf), mci, putflags))
1955                         goto writeerr;
1956                 v += l + 1;
1957                 obp = obuf;
1958                 if (*v != ' ' && *v != '\t')
1959                         *obp++ = ' ';
1960         }
1961
1962         /* XXX This is broken for SPACELEFT()==0 */
1963         (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s",
1964                            (int) (SPACELEFT(obuf, obp) - 1), v);
1965         return putxline(obuf, strlen(obuf), mci, putflags);
1966
1967   writeerr:
1968         return false;
1969 }
1970
1971 /*
1972 **  COMMAIZE -- output a header field, making a comma-translated list.
1973 **
1974 **      Parameters:
1975 **              h -- the header field to output.
1976 **              p -- the value to put in it.
1977 **              oldstyle -- true if this is an old style header.
1978 **              mci -- the connection information.
1979 **              e -- the envelope containing the message.
1980 **
1981 **      Returns:
1982 **              true iff header field was written successfully
1983 **
1984 **      Side Effects:
1985 **              outputs "p" to "mci".
1986 */
1987
1988 bool
1989 commaize(h, p, oldstyle, mci, e)
1990         register HDR *h;
1991         register char *p;
1992         bool oldstyle;
1993         register MCI *mci;
1994         register ENVELOPE *e;
1995 {
1996         register char *obp;
1997         int opos, omax, spaces;
1998         bool firstone = true;
1999         int putflags = PXLF_HEADER | PXLF_STRIPMQUOTE;
2000         char **res;
2001         char obuf[MAXLINE + 3];
2002
2003         /*
2004         **  Output the address list translated by the
2005         **  mailer and with commas.
2006         */
2007
2008         if (tTd(14, 2))
2009                 sm_dprintf("commaize(%s:%s)\n", h->h_field, p);
2010
2011         if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
2012                 putflags |= PXLF_STRIP8BIT;
2013
2014         obp = obuf;
2015         (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.200s:", h->h_field);
2016         /* opos = strlen(obp); instead of the next 3 lines? */
2017         opos = strlen(h->h_field) + 1;
2018         if (opos > 201)
2019                 opos = 201;
2020         obp += opos;
2021
2022         spaces = 0;
2023         while (*p != '\0' && isascii(*p) && isspace(*p))
2024         {
2025                 ++spaces;
2026                 ++p;
2027         }
2028         if (spaces > 0)
2029         {
2030                 SM_ASSERT(sizeof(obuf) > opos  * 2);
2031
2032                 /*
2033                 **  Restrict number of spaces to half the length of buffer
2034                 **  so the header field body can be put in here too.
2035                 **  Note: this is a hack...
2036                 */
2037
2038                 if (spaces > sizeof(obuf) / 2)
2039                         spaces = sizeof(obuf) / 2;
2040                 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%*s", spaces,
2041                                 "");
2042                 opos += spaces;
2043                 obp += spaces;
2044                 SM_ASSERT(obp < &obuf[MAXLINE]);
2045         }
2046
2047         omax = mci->mci_mailer->m_linelimit - 2;
2048         if (omax < 0 || omax > 78)
2049                 omax = 78;
2050
2051         /*
2052         **  Run through the list of values.
2053         */
2054
2055         while (*p != '\0')
2056         {
2057                 register char *name;
2058                 register int c;
2059                 char savechar;
2060                 int flags;
2061                 auto int status;
2062
2063                 /*
2064                 **  Find the end of the name.  New style names
2065                 **  end with a comma, old style names end with
2066                 **  a space character.  However, spaces do not
2067                 **  necessarily delimit an old-style name -- at
2068                 **  signs mean keep going.
2069                 */
2070
2071                 /* find end of name */
2072                 while ((isascii(*p) && isspace(*p)) || *p == ',')
2073                         p++;
2074                 name = p;
2075                 res = NULL;
2076                 for (;;)
2077                 {
2078                         auto char *oldp;
2079                         char pvpbuf[PSBUFSIZE];
2080
2081                         res = prescan(p, oldstyle ? ' ' : ',', pvpbuf,
2082                                       sizeof(pvpbuf), &oldp, ExtTokenTab, false);
2083                         p = oldp;
2084 #if _FFR_IGNORE_BOGUS_ADDR
2085                         /* ignore addresses that can't be parsed */
2086                         if (res == NULL)
2087                         {
2088                                 name = p;
2089                                 continue;
2090                         }
2091 #endif /* _FFR_IGNORE_BOGUS_ADDR */
2092
2093                         /* look to see if we have an at sign */
2094                         while (*p != '\0' && isascii(*p) && isspace(*p))
2095                                 p++;
2096
2097                         if (*p != '@')
2098                         {
2099                                 p = oldp;
2100                                 break;
2101                         }
2102                         ++p;
2103                         while (*p != '\0' && isascii(*p) && isspace(*p))
2104                                 p++;
2105                 }
2106                 /* at the end of one complete name */
2107
2108                 /* strip off trailing white space */
2109                 while (p >= name &&
2110                        ((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
2111                         p--;
2112                 if (++p == name)
2113                         continue;
2114
2115                 /*
2116                 **  if prescan() failed go a bit backwards; this is a hack,
2117                 **  there should be some better error recovery.
2118                 */
2119
2120                 if (res == NULL && p > name &&
2121                     !((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
2122                         --p;
2123                 savechar = *p;
2124                 *p = '\0';
2125
2126                 /* translate the name to be relative */
2127                 flags = RF_HEADERADDR|RF_ADDDOMAIN;
2128                 if (bitset(H_FROM, h->h_flags))
2129                         flags |= RF_SENDERADDR;
2130 #if USERDB
2131                 else if (e->e_from.q_mailer != NULL &&
2132                          bitnset(M_UDBRECIPIENT, e->e_from.q_mailer->m_flags))
2133                 {
2134                         char *q;
2135
2136                         q = udbsender(name, e->e_rpool);
2137                         if (q != NULL)
2138                                 name = q;
2139                 }
2140 #endif /* USERDB */
2141                 status = EX_OK;
2142                 name = remotename(name, mci->mci_mailer, flags, &status, e);
2143                 if (*name == '\0')
2144                 {
2145                         *p = savechar;
2146                         continue;
2147                 }
2148                 name = denlstring(name, false, true);
2149
2150                 /* output the name with nice formatting */
2151                 opos += strlen(name);
2152                 if (!firstone)
2153                         opos += 2;
2154                 if (opos > omax && !firstone)
2155                 {
2156                         (void) sm_strlcpy(obp, ",\n", SPACELEFT(obuf, obp));
2157                         if (!putxline(obuf, strlen(obuf), mci, putflags))
2158                                 goto writeerr;
2159                         obp = obuf;
2160                         (void) sm_strlcpy(obp, "        ", sizeof(obuf));
2161                         opos = strlen(obp);
2162                         obp += opos;
2163                         opos += strlen(name);
2164                 }
2165                 else if (!firstone)
2166                 {
2167                         (void) sm_strlcpy(obp, ", ", SPACELEFT(obuf, obp));
2168                         obp += 2;
2169                 }
2170
2171                 while ((c = *name++) != '\0' && obp < &obuf[MAXLINE])
2172                         *obp++ = c;
2173                 firstone = false;
2174                 *p = savechar;
2175         }
2176         if (obp < &obuf[sizeof(obuf)])
2177                 *obp = '\0';
2178         else
2179                 obuf[sizeof(obuf) - 1] = '\0';
2180         return putxline(obuf, strlen(obuf), mci, putflags);
2181
2182   writeerr:
2183         return false;
2184 }
2185
2186 /*
2187 **  COPYHEADER -- copy header list
2188 **
2189 **      This routine is the equivalent of newstr for header lists
2190 **
2191 **      Parameters:
2192 **              header -- list of header structures to copy.
2193 **              rpool -- resource pool, or NULL
2194 **
2195 **      Returns:
2196 **              a copy of 'header'.
2197 **
2198 **      Side Effects:
2199 **              none.
2200 */
2201
2202 HDR *
2203 copyheader(header, rpool)
2204         register HDR *header;
2205         SM_RPOOL_T *rpool;
2206 {
2207         register HDR *newhdr;
2208         HDR *ret;
2209         register HDR **tail = &ret;
2210
2211         while (header != NULL)
2212         {
2213                 newhdr = (HDR *) sm_rpool_malloc_x(rpool, sizeof(*newhdr));
2214                 STRUCTCOPY(*header, *newhdr);
2215                 *tail = newhdr;
2216                 tail = &newhdr->h_link;
2217                 header = header->h_link;
2218         }
2219         *tail = NULL;
2220
2221         return ret;
2222 }
2223
2224 /*
2225 **  FIX_MIME_HEADER -- possibly truncate/rebalance parameters in a MIME header
2226 **
2227 **      Run through all of the parameters of a MIME header and
2228 **      possibly truncate and rebalance the parameter according
2229 **      to MaxMimeFieldLength.
2230 **
2231 **      Parameters:
2232 **              h -- the header to truncate/rebalance
2233 **              e -- the current envelope
2234 **
2235 **      Returns:
2236 **              length of last offending field, 0 if all ok.
2237 **
2238 **      Side Effects:
2239 **              string modified in place
2240 */
2241
2242 static size_t
2243 fix_mime_header(h, e)
2244         HDR *h;
2245         ENVELOPE *e;
2246 {
2247         char *begin = h->h_value;
2248         char *end;
2249         size_t len = 0;
2250         size_t retlen = 0;
2251
2252         if (begin == NULL || *begin == '\0')
2253                 return 0;
2254
2255         /* Split on each ';' */
2256         /* find_character() never returns NULL */
2257         while ((end = find_character(begin, ';')) != NULL)
2258         {
2259                 char save = *end;
2260                 char *bp;
2261
2262                 *end = '\0';
2263
2264                 len = strlen(begin);
2265
2266                 /* Shorten individual parameter */
2267                 if (shorten_rfc822_string(begin, MaxMimeFieldLength))
2268                 {
2269                         if (len < MaxMimeFieldLength)
2270                         {
2271                                 /* we only rebalanced a bogus field */
2272                                 sm_syslog(LOG_ALERT, e->e_id,
2273                                           "Fixed MIME %s header field (possible attack)",
2274                                           h->h_field);
2275                                 if (tTd(34, 11))
2276                                         sm_dprintf("  fixed MIME %s header field (possible attack)\n",
2277                                                    h->h_field);
2278                         }
2279                         else
2280                         {
2281                                 /* we actually shortened the header */
2282                                 retlen = len;
2283                         }
2284                 }
2285
2286                 /* Collapse the possibly shortened string with rest */
2287                 bp = begin + strlen(begin);
2288                 if (bp != end)
2289                 {
2290                         char *ep = end;
2291
2292                         *end = save;
2293                         end = bp;
2294
2295                         /* copy character by character due to overlap */
2296                         while (*ep != '\0')
2297                                 *bp++ = *ep++;
2298                         *bp = '\0';
2299                 }
2300                 else
2301                         *end = save;
2302                 if (*end == '\0')
2303                         break;
2304
2305                 /* Move past ';' */
2306                 begin = end + 1;
2307         }
2308         return retlen;
2309 }