git.marmaro.de Git - mmh/blob - uip/mhbuild.c

   1 /*
   2 ** mhbuild.c -- expand/translate MIME composition files
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 /*
  10 ** This code was originally part of mhn.c.  I split it into
  11 ** a separate program (mhbuild.c). But the code still has some of
  12 ** the mhn.c code in it.  This program needs additional
  13 ** streamlining and removal of unneeded code.
  14 */
  15
  16 #include <h/mh.h>
  17 #include <fcntl.h>
  18 #include <errno.h>
  19 #include <h/tws.h>
  20 #include <h/mime.h>
  21 #include <h/mhparse.h>
  22 #include <h/utils.h>
  23
  24 #ifdef HAVE_SYS_TIME_H
  25 # include <sys/time.h>
  26 #endif
  27 #include <time.h>
  28
  29 static struct swit switches[] = {
  30 #define VERBSW  0
  31         { "verbose", 0 },
  32 #define NVERBSW  1
  33         { "noverbose", 2 },
  34 #define VERSIONSW  2
  35         { "Version", 0 },
  36 #define HELPSW  3
  37         { "help", 0 },
  38 #define DEBUGSW  4
  39         { "debug", -5 },
  40         { NULL, 0 }
  41 };
  42
  43
  44 /*
  45 ** Directory to place tmp files.  This must
  46 ** be set before these routines are called.
  47 */
  48 char *tmp;
  49
  50 pid_t xpid = 0;
  51
  52 static char prefix[] = "----- =_aaaaaaaaaa";
  53
  54
  55 /*
  56 ** prototypes
  57 */
  58
  59 /* mhmisc.c */
  60 int make_intermediates(char *);
  61 void content_error(char *, CT, char *, ...);
  62
  63 /* mhfree.c */
  64 void free_content(CT);
  65 void free_ctinfo(CT);
  66 void free_encoding(CT, int);
  67
  68 /*
  69 ** static prototypes
  70 */
  71 static int init_decoded_content(CT);
  72 static char *fgetstr(char *, int, FILE *);
  73 static int user_content(FILE *, char *, char *, CT *);
  74 static void set_id(CT, int);
  75 static int compose_content(CT);
  76 static int scan_content(CT);
  77 static int build_headers(CT);
  78 static CT build_mime(char *);
  79
  80
  81 int debugsw = 0;
  82 int verbosw = 0;
  83
  84 /*
  85 ** Temporary files
  86 */
  87 static char infile[BUFSIZ];
  88 static int unlink_infile  = 0;
  89
  90 static char outfile[BUFSIZ];
  91 static int unlink_outfile = 0;
  92
  93 void unlink_done();
  94
  95 /* mhoutsbr.c */
  96 int output_message(CT, char *);
  97 int output_message_fp(CT, FILE *, char*);
  98
  99 /* mhmisc.c */
 100 void set_endian(void);
 101
 102 /* mhfree.c */
 103 void free_content(CT);
 104
 105
 106 int
 107 main(int argc, char **argv)
 108 {
 109         char *cp, buf[BUFSIZ];
 110         char buffer[BUFSIZ], *compfile = NULL;
 111         char **argp, **arguments;
 112         CT ct;
 113         FILE *fp = NULL;
 114         FILE *fp_out = NULL;
 115
 116         if (atexit(unlink_done) != 0) {
 117                 adios(NULL, "atexit failed");
 118         }
 119
 120         setlocale(LC_ALL, "");
 121         invo_name = mhbasename(argv[0]);
 122
 123         /* read user profile/context */
 124         context_read();
 125
 126         arguments = getarguments(invo_name, argc, argv, 1);
 127         argp = arguments;
 128
 129         while ((cp = *argp++)) {
 130                 if (cp[0] == '-' && cp[1] == '\0') {
 131                         if (compfile)
 132                                 adios(NULL, "cannot specify both standard input and a file");
 133                         else
 134                                 compfile = cp;
 135                         verbosw = 0;  /* turn off -verbose listings */
 136                         break;
 137                 }
 138                 if (*cp == '-') {
 139                         switch (smatch(++cp, switches)) {
 140                         case AMBIGSW:
 141                                 ambigsw(cp, switches);
 142                                 /* sysexits.h EX_USAGE */
 143                                 exit(1);
 144                         case UNKWNSW:
 145                                 adios(NULL, "-%s unknown", cp);
 146
 147                         case HELPSW:
 148                                 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
 149                                 print_help(buf, switches, 1);
 150                                 exit(0);
 151                         case VERSIONSW:
 152                                 print_version(invo_name);
 153                                 exit(0);
 154
 155                         case VERBSW:
 156                                 verbosw++;
 157                                 continue;
 158                         case NVERBSW:
 159                                 verbosw = 0;
 160                                 continue;
 161                         case DEBUGSW:
 162                                 debugsw = 1;
 163                                 continue;
 164                         }
 165                 }
 166                 if (compfile)
 167                         adios(NULL, "only one composition file allowed");
 168                 else
 169                         compfile = cp;
 170         }
 171
 172         set_endian();
 173
 174         /*
 175         ** Check if we've specified an additional profile
 176         */
 177         if ((cp = getenv("MHBUILD"))) {
 178                 if ((fp = fopen(cp, "r"))) {
 179                         readconfig((struct node **) 0, fp, cp, 0);
 180                         fclose(fp);
 181                 } else {
 182                         admonish("", "unable to read $MHBUILD profile (%s)",
 183                                         cp);
 184                 }
 185         }
 186
 187         /*
 188         ** Read the standard profile setup
 189         */
 190         if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
 191                 readconfig((struct node **) 0, fp, cp, 0);
 192                 fclose(fp);
 193         }
 194
 195         /*
 196         ** Check for storage directory.  If defined, we
 197         ** will store temporary files there.  Else we
 198         ** store them in standard nmh directory.
 199         */
 200         if ((cp = context_find(nmhstorage)) && *cp)
 201                 tmp = concat(cp, "/", invo_name, NULL);
 202         else
 203                 tmp = getcpy(toabsdir(invo_name));
 204
 205         /* Check if we have a file to process */
 206         if (!compfile)
 207                 adios(NULL, "need to specify a %s composition file",
 208                                 invo_name);
 209
 210         /*
 211         ** Process the composition file from standard input.
 212         */
 213         if (compfile[0] == '-' && compfile[1] == '\0') {
 214                 /* copy standard input to temporary file */
 215                 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
 216                                 sizeof(infile));
 217                 while (fgets(buffer, BUFSIZ, stdin))
 218                         fputs(buffer, fp);
 219                 fclose(fp);
 220                 unlink_infile = 1;
 221
 222                 /* build the content structures for MIME message */
 223                 ct = build_mime(infile);
 224
 225                 /* output MIME message to this temporary file */
 226                 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
 227                                 sizeof(outfile));
 228                 unlink_outfile = 1;
 229
 230                 /* output the message */
 231                 output_message_fp(ct, fp_out, outfile);
 232                 fclose(fp_out);
 233
 234                 /* output the temp file to standard output */
 235                 if ((fp = fopen(outfile, "r")) == NULL)
 236                         adios(outfile, "unable to open");
 237                 while (fgets(buffer, BUFSIZ, fp))
 238                         fputs(buffer, stdout);
 239                 fclose(fp);
 240
 241                 unlink(infile);
 242                 unlink_infile = 0;
 243
 244                 unlink(outfile);
 245                 unlink_outfile = 0;
 246
 247                 free_content(ct);
 248                 exit(0);
 249         }
 250
 251         /*
 252         ** Process the composition file from a file.
 253         */
 254
 255         /* build the content structures for MIME message */
 256         ct = build_mime(compfile);
 257
 258         /* output MIME message to this temporary file */
 259         strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
 260                         sizeof(outfile));
 261         unlink_outfile = 1;
 262
 263         /* output the message */
 264         output_message_fp(ct, fp_out, outfile);
 265         fclose(fp_out);
 266
 267         /* Rename composition draft */
 268         snprintf(buffer, sizeof(buffer), "%s.orig", compfile);
 269         if (rename(compfile, buffer) == NOTOK) {
 270                 adios(buffer, "unable to rename draft %s to", compfile);
 271         }
 272
 273         /* Rename output file to take its place */
 274         if (rename(outfile, compfile) == NOTOK) {
 275                 advise(compfile, "unable to rename output %s to", outfile);
 276                 rename(buffer, compfile);
 277                 /* sysexits.h EX_IOERR */
 278                 exit(1);
 279         }
 280         unlink_outfile = 0;
 281
 282         free_content(ct);
 283         return 0;
 284 }
 285
 286
 287 void
 288 unlink_done()
 289 {
 290         /*
 291         ** Check if we need to remove stray temporary files.
 292         */
 293         if (unlink_infile) {
 294                 unlink(infile);
 295         }
 296         if (unlink_outfile) {
 297                 unlink(outfile);
 298         }
 299 }
 300
 301 /*
 302 ** Main routine for translating composition file
 303 ** into valid MIME message.  It translates the draft
 304 ** into a content structure (actually a tree of content
 305 ** structures).  This message then can be manipulated
 306 ** in various ways, including being output via
 307 ** output_message().
 308 */
 309 static CT
 310 build_mime(char *infile)
 311 {
 312         int compnum, state;
 313         char buf[BUFSIZ], name[NAMESZ];
 314         char *cp, *np, *vp;
 315         struct multipart *m;
 316         struct part **pp;
 317         CT ct;
 318         FILE *in;
 319
 320         umask(~m_gmprot());
 321
 322         /* open the composition draft */
 323         if ((in = fopen(infile, "r")) == NULL)
 324                 adios(infile, "unable to open for reading");
 325
 326         /*
 327         ** Allocate space for primary (outside) content
 328         */
 329         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 330                 adios(NULL, "out of memory");
 331
 332         /*
 333         ** Allocate structure for handling decoded content
 334         ** for this part.  We don't really need this, but
 335         ** allocate it to remain consistent.
 336         */
 337         init_decoded_content(ct);
 338
 339         /*
 340         ** Parse some of the header fields in the composition
 341         ** draft into the linked list of header fields for
 342         ** the new MIME message.
 343         */
 344         for (compnum = 1, state = FLD;;) {
 345                 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
 346                 case FLD:
 347                 case FLDPLUS:
 348                 case FLDEOF:
 349                         compnum++;
 350
 351                         /* abort if draft has Mime-Version header field */
 352                         if (!mh_strcasecmp(name, VRSN_FIELD))
 353                                 adios(NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
 354
 355                         /*
 356                         ** abort if draft has Content-Transfer-Encoding
 357                         ** header field
 358                         */
 359                         if (!mh_strcasecmp(name, ENCODING_FIELD))
 360                                 adios(NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
 361
 362                         /* ignore any Content-Type fields in the header */
 363                         if (!mh_strcasecmp(name, TYPE_FIELD)) {
 364                                 while (state == FLDPLUS)
 365                                         state = m_getfld(state, name, buf,
 366                                                         sizeof(buf), in);
 367                                 goto finish_field;
 368                         }
 369
 370                         /* get copies of the buffers */
 371                         np = getcpy(name);
 372                         vp = getcpy(buf);
 373
 374                         /* if necessary, get rest of field */
 375                         while (state == FLDPLUS) {
 376                                 state = m_getfld(state, name, buf,
 377                                                 sizeof(buf), in);
 378                                 vp = add(buf, vp);  /* add to prev value */
 379                         }
 380
 381                         /* Now add the header data to the list */
 382                         add_header(ct, np, vp);
 383
 384 finish_field:
 385                         /* if this wasn't the last hdr field, then continue */
 386                         if (state != FLDEOF)
 387                                 continue;
 388                         /* else fall... */
 389
 390                 case FILEEOF:
 391                         adios(NULL, "draft has empty body -- no directives!");
 392                         /* NOTREACHED */
 393
 394                 case BODY:
 395                 case BODYEOF:
 396                         fseek(in, (long) (-strlen(buf)), SEEK_CUR);
 397                         break;
 398
 399                 case LENERR:
 400                 case FMTERR:
 401                         adios(NULL, "message format error in component #%d",
 402                                         compnum);
 403
 404                 default:
 405                         adios(NULL, "getfld() returned %d", state);
 406                 }
 407                 break;
 408         }
 409
 410         /*
 411         ** Now add the MIME-Version header field
 412         ** to the list of header fields.
 413         */
 414         np = getcpy(VRSN_FIELD);
 415         vp = concat(" ", VRSN_VALUE, "\n", NULL);
 416         add_header(ct, np, vp);
 417
 418         /*
 419         ** We initally assume we will find multiple contents in the
 420         ** draft.  So create a multipart/mixed content to hold everything.
 421         ** We can remove this later, if it is not needed.
 422         */
 423         if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK) {
 424                 /* sysexits.h EX_DATAERR */
 425                 exit(1);
 426         }
 427         ct->c_type = CT_MULTIPART;
 428         ct->c_subtype = MULTI_MIXED;
 429         ct->c_file = getcpy(infile);
 430
 431         if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
 432                 adios(NULL, "out of memory");
 433         ct->c_ctparams = (void *) m;
 434         pp = &m->mp_parts;
 435
 436         /*
 437         ** read and parse the composition file
 438         ** and the directives it contains.
 439         */
 440         while (fgetstr(buf, sizeof(buf) - 1, in)) {
 441                 struct part *part;
 442                 CT p;
 443
 444                 if (user_content(in, infile, buf, &p) == DONE) {
 445                         admonish(NULL, "ignoring spurious #end");
 446                         continue;
 447                 }
 448                 if (!p)
 449                         continue;
 450
 451                 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 452                         adios(NULL, "out of memory");
 453                 *pp = part;
 454                 pp = &part->mp_next;
 455                 part->mp_part = p;
 456         }
 457
 458         /*
 459         ** close the composition draft since
 460         ** it's not needed any longer.
 461         */
 462         fclose(in);
 463
 464         /* check if any contents were found */
 465         if (!m->mp_parts)
 466                 adios(NULL, "no content directives found");
 467
 468         /*
 469         ** If only one content was found, then remove and
 470         ** free the outer multipart content.
 471         */
 472         if (!m->mp_parts->mp_next) {
 473                 CT p;
 474
 475                 p = m->mp_parts->mp_part;
 476                 m->mp_parts->mp_part = NULL;
 477
 478                 /* move header fields */
 479                 p->c_first_hf = ct->c_first_hf;
 480                 p->c_last_hf = ct->c_last_hf;
 481                 ct->c_first_hf = NULL;
 482                 ct->c_last_hf = NULL;
 483
 484                 free_content(ct);
 485                 ct = p;
 486         } else {
 487                 set_id(ct, 1);
 488         }
 489
 490         /*
 491         ** Fill out, or expand directives.  Parse and execute
 492         ** commands specified by profile composition strings.
 493         */
 494         compose_content(ct);
 495
 496         if ((cp = strchr(prefix, 'a')) == NULL)
 497                 adios(NULL, "internal error(4)");
 498
 499         /*
 500         ** Scan the contents.  Choose a transfer encoding, and
 501         ** check if prefix for multipart boundary clashes with
 502         ** any of the contents.
 503         */
 504         while (scan_content(ct) == NOTOK) {
 505                 if (*cp < 'z') {
 506                         (*cp)++;
 507                 } else {
 508                         if (*++cp == 0)
 509                                 adios(NULL, "giving up trying to find a unique delimiter string");
 510                                 else
 511                                 (*cp)++;
 512                 }
 513         }
 514
 515         /* Build the rest of the header field structures */
 516         build_headers(ct);
 517
 518         return ct;
 519 }
 520
 521
 522 /*
 523 ** Set up structures for placing unencoded
 524 ** content when building parts.
 525 */
 526
 527 static int
 528 init_decoded_content(CT ct)
 529 {
 530         CE ce;
 531
 532         if ((ce = (CE) calloc(1, sizeof(*ce))) == NULL)
 533                 adios(NULL, "out of memory");
 534
 535         ct->c_cefile     = ce;
 536         ct->c_ceopenfnx  = open7Bit;  /* since unencoded */
 537         ct->c_ceclosefnx = close_encoding;
 538         ct->c_cesizefnx  = NULL;  /* since unencoded */
 539
 540         return OK;
 541 }
 542
 543
 544 static char *
 545 fgetstr(char *s, int n, FILE *stream)
 546 {
 547         char *cp, *ep;
 548
 549         for (ep = (cp = s) + n; cp < ep; ) {
 550                 int i;
 551
 552                 if (!fgets(cp, n, stream))
 553                         return (cp != s ? s : NULL);
 554                 if (cp == s && *cp != '#')
 555                         return s;
 556
 557                 cp += (i = strlen(cp)) - 1;
 558                 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
 559                         break;
 560                 *cp = '\0';
 561                 n -= (i - 2);
 562         }
 563
 564         return s;
 565 }
 566
 567
 568 /*
 569 ** Parse the composition draft for text and directives.
 570 ** Do initial setup of Content structure.
 571 */
 572
 573 static int
 574 user_content(FILE *in, char *file, char *buf, CT *ctp)
 575 {
 576         int vrsn;
 577         unsigned char *cp;
 578         char **ap;
 579         char buffer[BUFSIZ];
 580         struct multipart *m;
 581         struct part **pp;
 582         struct str2init *s2i;
 583         CI ci;
 584         CT ct;
 585         CE ce;
 586
 587         if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
 588                 *ctp = NULL;
 589                 return OK;
 590         }
 591
 592         /* allocate basic Content structure */
 593         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 594                 adios(NULL, "out of memory");
 595         *ctp = ct;
 596
 597         /* allocate basic structure for handling decoded content */
 598         init_decoded_content(ct);
 599         ce = ct->c_cefile;
 600
 601         ci = &ct->c_ctinfo;
 602         set_id(ct, 0);
 603
 604         /*
 605         ** Handle inline text.  Check if line
 606         ** is one of the following forms:
 607         **
 608         ** 1) doesn't begin with '#'  (implicit directive)
 609         ** 2) begins with "##"        (implicit directive)
 610         ** 3) begins with "#<"
 611         */
 612         if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
 613                 int headers;
 614                 int inlineD;
 615                 long pos;
 616                 char content[BUFSIZ];
 617                 FILE *out;
 618                 char *cp;
 619
 620                 cp = m_mktemp2(NULL, invo_name, NULL, &out);
 621                 if (cp == NULL)
 622                         adios("mhbuild", "unable to create temporary file");
 623
 624                 /* use a temp file to collect the plain text lines */
 625                 ce->ce_file = getcpy(cp);
 626                 ce->ce_unlink = 1;
 627
 628                 if (buf[0] == '#' && buf[1] == '<') {
 629                         strncpy(content, buf + 2, sizeof(content));
 630                         inlineD = 1;
 631                         goto rock_and_roll;
 632                 } else {
 633                         inlineD = 0;
 634                 }
 635
 636                 /* the directive is implicit */
 637                 strncpy(content, "text/plain", sizeof(content));
 638                 headers = 0;
 639                 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
 640                 for (;;) {
 641                         int i;
 642
 643                         if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
 644                                         buffer[i=strlen(DESCR_FIELD)] == ':') {
 645                                 headers = 1;
 646
 647 again_descr:
 648                                 ct->c_descr = add(buffer + i + 1, ct->c_descr);
 649                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 650                                         adios(NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
 651                                 switch (buffer[0]) {
 652                                 case ' ':
 653                                 case '\t':
 654                                         i = -1;
 655                                         goto again_descr;
 656
 657                                 case '#':
 658                                         adios(NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
 659                                         /* NOTREACHED */
 660
 661                                 default:
 662                                         break;
 663                                 }
 664                         }
 665
 666                         if (headers >= 0 && uprf(buffer, DISPO_FIELD)
 667                                 && buffer[i = strlen(DISPO_FIELD)] == ':') {
 668                                 headers = 1;
 669
 670 again_dispo:
 671                                 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
 672                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 673                                         adios(NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
 674                                 switch (buffer[0]) {
 675                                 case ' ':
 676                                 case '\t':
 677                                         i = -1;
 678                                         goto again_dispo;
 679
 680                                 case '#':
 681                                         adios(NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
 682                                         /* NOTREACHED */
 683
 684                                 default:
 685                                         break;
 686                                 }
 687                         }
 688
 689                         if (headers != 1 || buffer[0] != '\n')
 690                                 fputs(buffer, out);
 691
 692 rock_and_roll:
 693                         headers = -1;
 694                         pos = ftell(in);
 695                         if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
 696                                         == NULL)
 697                                 break;
 698                         if (buffer[0] == '#') {
 699                                 char *bp;
 700
 701                                 if (buffer[1] != '#')
 702                                         break;
 703                                 for (cp = (bp = buffer) + 1; *cp; cp++)
 704                                         *bp++ = *cp;
 705                                 *bp = '\0';
 706                         }
 707                 }
 708
 709                 fclose(out);
 710
 711                 /* parse content type */
 712                 if (get_ctinfo(content, ct, inlineD) == NOTOK)
 713                         /* sysexits.h EX_USAGE */
 714                         exit(1);
 715
 716                 for (s2i = str2cts; s2i->si_key; s2i++)
 717                         if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 718                                 break;
 719                 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
 720                         s2i++;
 721
 722                 /*
 723                 ** check type specified (possibly implicitly)
 724                 */
 725                 switch (ct->c_type = s2i->si_val) {
 726                 case CT_MESSAGE:
 727                         if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
 728                                 ct->c_encoding = CE_7BIT;
 729                                 goto call_init;
 730                         }
 731                         /* else fall... */
 732                 case CT_MULTIPART:
 733                         adios(NULL, "it doesn't make sense to define an in-line %s content",
 734                                         ct->c_type == CT_MESSAGE ? "message" :
 735                                         "multipart");
 736                         /* NOTREACHED */
 737
 738                 default:
 739 call_init:
 740                         if ((ct->c_ctinitfnx = s2i->si_init))
 741                                 (*ct->c_ctinitfnx) (ct);
 742                         break;
 743                 }
 744
 745                 if (cp)
 746                         fseek(in, pos, SEEK_SET);
 747                 return OK;
 748         }
 749
 750         /*
 751         ** If we've reached this point, the next line
 752         ** must be some type of explicit directive.
 753         */
 754
 755         if (buf[1] == '@') {
 756                 adios(NULL, "The #@ directive i.e. message/external-body "
 757                                 "is not supported anymore.");
 758         }
 759
 760         /* parse directive */
 761         if (get_ctinfo(buf+1, ct, 1) == NOTOK)
 762                 /* sysexits.h EX_DATAERR */
 763                 exit(1);
 764
 765         /* check directive against the list of MIME types */
 766         for (s2i = str2cts; s2i->si_key; s2i++)
 767                 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 768                         break;
 769
 770         /*
 771         ** Check if the directive specified a valid type.
 772         ** This will happen if it was one of the following forms:
 773         **
 774         **    #type/subtype
 775         */
 776         if (s2i->si_key) {
 777                 if (!ci->ci_subtype)
 778                         adios(NULL, "missing subtype in \"#%s\"", ci->ci_type);
 779
 780                 switch (ct->c_type = s2i->si_val) {
 781                 case CT_MULTIPART:
 782                         adios(NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 783                         /* NOTREACHED */
 784
 785                 case CT_MESSAGE:
 786                         if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
 787                                         !mh_strcasecmp(ci->ci_subtype,
 788                                         "external-body")) {
 789                                 adios(NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
 790                         }
 791 use_forw:
 792                         admonish(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 793                         /* FALL */
 794
 795                 default:
 796                         if ((ct->c_ctinitfnx = s2i->si_init))
 797                                 (*ct->c_ctinitfnx) (ct);
 798                         break;
 799                 }
 800
 801                 /* Handle [file] argument */
 802                 if (ci->ci_magic) {
 803                         /* check if specifies command to execute */
 804                         if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
 805                                 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
 806                                         continue;
 807                                 if (!*cp)
 808                                         adios(NULL, "empty pipe command for #%s directive", ci->ci_type);
 809                                 cp = getcpy(cp);
 810                                 free(ci->ci_magic);
 811                                 ci->ci_magic = cp;
 812                         } else {
 813                                 /* record filename of decoded contents */
 814                                 ce->ce_file = ci->ci_magic;
 815                                 if (access(ce->ce_file, R_OK) == NOTOK)
 816                                         adios("reading", "unable to access %s for", ce->ce_file);
 817                                 ci->ci_magic = NULL;
 818                         }
 819                         return OK;
 820                 }
 821
 822                 /*
 823                 ** No [file] argument, so check profile for
 824                 ** method to compose content.
 825                 */
 826                 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
 827                                 invo_name, ci->ci_type, ci->ci_subtype);
 828                 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
 829                         snprintf(buffer, sizeof(buffer), "%s-compose-%s",
 830                                         invo_name, ci->ci_type);
 831                         if ((cp = context_find(buffer)) == NULL ||
 832                                         *cp == '\0') {
 833                                 content_error(NULL, ct, "don't know how to compose content");
 834                                 /* sysexits.h EX_USAGE */
 835                                 exit(1);
 836                         }
 837                 }
 838                 ci->ci_magic = getcpy(cp);
 839                 return OK;
 840         }
 841
 842         /*
 843         ** Message directive
 844         ** #forw [+folder] [msgs]
 845         */
 846         if (!mh_strcasecmp(ci->ci_type, "forw")) {
 847                 int msgnum;
 848                 char *folder, *arguments[MAXARGS];
 849                 struct msgs *mp;
 850
 851                 if (ci->ci_magic) {
 852                         int i;
 853
 854                         ap = brkstring(ci->ci_magic, " ", "\n");
 855                         for (i=0; ap[i] && i<MAXARGS-1; i++) {
 856                                 arguments[i] = ap[i];
 857                         }
 858                         arguments[i] = NULL;
 859
 860                 } else {
 861                         arguments[0] = seq_cur;
 862                         arguments[1] = NULL;
 863                 }
 864                 folder = NULL;
 865
 866                 /* search the arguments for a folder name */
 867                 for (ap = arguments; *ap; ap++) {
 868                         cp = *ap;
 869                         if (*cp == '+' || *cp == '@') {
 870                                 if (folder)
 871                                         adios(NULL, "only one folder per #forw directive");
 872                                 else
 873                                         folder = getcpy(expandfol(cp));
 874                         }
 875                 }
 876
 877                 /* else, use the current folder */
 878                 if (!folder)
 879                         folder = getcpy(getcurfol());
 880
 881                 if (!(mp = folder_read(folder)))
 882                         adios(NULL, "unable to read folder %s", folder);
 883                 for (ap = arguments; *ap; ap++) {
 884                         cp = *ap;
 885                         if (*cp != '+' && *cp != '@')
 886                                 if (!m_convert(mp, cp))
 887                                         /* sysexits.h EX_USAGE */
 888                                         exit(1);
 889                 }
 890                 free(folder);
 891                 free_ctinfo(ct);
 892
 893                 /*
 894                 ** If there is more than one message to include, make this
 895                 ** a content of type "multipart/digest" and insert each message
 896                 ** as a subpart.  If there is only one message, then make this
 897                 ** a content of type "message/rfc822".
 898                 */
 899                 if (mp->numsel > 1) {
 900                         /* we are forwarding multiple messages */
 901                         if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
 902                                 /* sysexits.h EX_DATAERR */
 903                                 exit(1);
 904                         ct->c_type = CT_MULTIPART;
 905                         ct->c_subtype = MULTI_DIGEST;
 906
 907                         if ((m = (struct multipart *)
 908                                         calloc(1, sizeof(*m))) == NULL)
 909                                 adios(NULL, "out of memory");
 910                         ct->c_ctparams = (void *) m;
 911                         pp = &m->mp_parts;
 912
 913                         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 914                                 if (is_selected(mp, msgnum)) {
 915                                         struct part *part;
 916                                         CT p;
 917                                         CE pe;
 918
 919                                         if ((p = (CT) calloc(1, sizeof(*p)))
 920                                                         == NULL)
 921                                                 adios(NULL, "out of memory");
 922                                         init_decoded_content(p);
 923                                         pe = p->c_cefile;
 924                                         if (get_ctinfo("message/rfc822", p, 0)
 925                                                         == NOTOK)
 926                                                 /* sysexits.h EX_DATAERR */
 927                                                 exit(1);
 928                                         p->c_type = CT_MESSAGE;
 929                                         p->c_subtype = MESSAGE_RFC822;
 930
 931                                         snprintf(buffer, sizeof(buffer),
 932                                                         "%s/%d", mp->foldpath,
 933                                                         msgnum);
 934                                         pe->ce_file = getcpy(buffer);
 935
 936                                         if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 937                                                 adios(NULL, "out of memory");
 938                                         *pp = part;
 939                                         pp = &part->mp_next;
 940                                         part->mp_part = p;
 941                                 }
 942                         }
 943                 } else {
 944                         /* we are forwarding one message */
 945                         if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
 946                                 /* sysexits.h EX_DATAERR */
 947                                 exit(1);
 948                         ct->c_type = CT_MESSAGE;
 949                         ct->c_subtype = MESSAGE_RFC822;
 950
 951                         msgnum = mp->lowsel;
 952                         snprintf(buffer, sizeof(buffer), "%s/%d",
 953                                         mp->foldpath, msgnum);
 954                         ce->ce_file = getcpy(buffer);
 955                 }
 956
 957                 folder_free(mp);  /* free folder/message structure */
 958                 return OK;
 959         }
 960
 961         /*
 962         ** #end
 963         */
 964         if (!mh_strcasecmp(ci->ci_type, "end")) {
 965                 free_content(ct);
 966                 *ctp = NULL;
 967                 return DONE;
 968         }
 969
 970         /*
 971         ** #begin [ alternative | parallel ]
 972         */
 973         if (!mh_strcasecmp(ci->ci_type, "begin")) {
 974                 if (!ci->ci_magic) {
 975                         vrsn = MULTI_MIXED;
 976                         cp = SubMultiPart[vrsn - 1].kv_key;
 977                 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
 978                         vrsn = MULTI_ALTERNATE;
 979                         cp = SubMultiPart[vrsn - 1].kv_key;
 980                 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
 981                         vrsn = MULTI_PARALLEL;
 982                         cp = SubMultiPart[vrsn - 1].kv_key;
 983                 } else if (uprf(ci->ci_magic, "digest")) {
 984                         goto use_forw;
 985                 } else {
 986                         vrsn = MULTI_UNKNOWN;
 987                         cp = ci->ci_magic;
 988                 }
 989
 990                 free_ctinfo(ct);
 991                 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
 992                 if (get_ctinfo(buffer, ct, 0) == NOTOK)
 993                         /* sysexits.h EX_DATAERR */
 994                         exit(1);
 995                 ct->c_type = CT_MULTIPART;
 996                 ct->c_subtype = vrsn;
 997
 998                 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
 999                         adios(NULL, "out of memory");
1000                 ct->c_ctparams = (void *) m;
1001
1002                 pp = &m->mp_parts;
1003                 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
1004                         struct part *part;
1005                         CT p;
1006
1007                         if (user_content(in, file, buffer, &p) == DONE) {
1008                                 if (!m->mp_parts)
1009                                         adios(NULL, "empty \"#begin ... #end\" sequence");
1010                                 return OK;
1011                         }
1012                         if (!p)
1013                                 continue;
1014
1015                         if ((part = (struct part *)
1016                                         calloc(1, sizeof(*part))) == NULL)
1017                                 adios(NULL, "out of memory");
1018                         *pp = part;
1019                         pp = &part->mp_next;
1020                         part->mp_part = p;
1021                 }
1022                 admonish(NULL, "premature end-of-file, missing #end");
1023                 return OK;
1024         }
1025
1026         /*
1027         ** Unknown directive
1028         */
1029         adios(NULL, "unknown directive \"#%s\"", ci->ci_type);
1030         return NOTOK;  /* NOT REACHED */
1031 }
1032
1033
1034 static void
1035 set_id(CT ct, int top)
1036 {
1037         char msgid[BUFSIZ];
1038         static int partno;
1039         static time_t clock = 0;
1040         static char *msgfmt;
1041
1042         if (clock == 0) {
1043                 time(&clock);
1044                 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1045                                 (int) getpid(), (long) clock, LocalName());
1046                 partno = 0;
1047                 msgfmt = getcpy(msgid);
1048         }
1049         snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1050         ct->c_id = getcpy(msgid);
1051 }
1052
1053
1054 /*
1055 ** Fill out, or expand the various contents in the composition
1056 ** draft.  Read-in any necessary files.  Parse and execute any
1057 ** commands specified by profile composition strings.
1058 */
1059
1060 static int
1061 compose_content(CT ct)
1062 {
1063         CE ce = ct->c_cefile;
1064
1065         switch (ct->c_type) {
1066         case CT_MULTIPART:
1067         {
1068                 int partnum;
1069                 char *pp;
1070                 char partnam[BUFSIZ];
1071                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1072                 struct part *part;
1073
1074                 if (ct->c_partno) {
1075                         snprintf(partnam, sizeof(partnam), "%s.",
1076                                         ct->c_partno);
1077                         pp = partnam + strlen(partnam);
1078                 } else {
1079                         pp = partnam;
1080                 }
1081
1082                 /* first, we call compose_content on all the subparts */
1083                 for (part = m->mp_parts, partnum = 1; part;
1084                                 part = part->mp_next, partnum++) {
1085                         CT p = part->mp_part;
1086
1087                         sprintf(pp, "%d", partnum);
1088                         p->c_partno = getcpy(partnam);
1089                         if (compose_content(p) == NOTOK)
1090                                 return NOTOK;
1091                 }
1092         }
1093         break;
1094
1095         case CT_MESSAGE:
1096                 /* Nothing to do for type message */
1097                 break;
1098
1099         /*
1100         ** Discrete types (text/application/audio/image/video)
1101         */
1102         default:
1103                 if (!ce->ce_file) {
1104                         pid_t child_id;
1105                         int xstdout, len, buflen;
1106                         char *bp, **ap, *cp;
1107                         char *vec[4], buffer[BUFSIZ];
1108                         FILE *out;
1109                         CI ci = &ct->c_ctinfo;
1110                         char *tfile = NULL;
1111
1112                         if (!(cp = ci->ci_magic))
1113                                 adios(NULL, "internal error(5)");
1114
1115                         tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1116                         if (tfile == NULL) {
1117                                 adios("mhbuild", "unable to create temporary file");
1118                         }
1119                         ce->ce_file = getcpy(tfile);
1120                         ce->ce_unlink = 1;
1121
1122                         xstdout = 0;
1123
1124                         /* Get buffer ready to go */
1125                         bp = buffer;
1126                         bp[0] = '\0';
1127                         buflen = sizeof(buffer);
1128
1129                         /*
1130                         ** Parse composition string into buffer
1131                         */
1132                         for ( ; *cp; cp++) {
1133                                 if (*cp == '%') {
1134                                         switch (*++cp) {
1135                                         case 'a':
1136                                         {
1137                                                 /*
1138                                                 ** insert parameters from
1139                                                 ** directive
1140                                                 */
1141                                                 char **ep;
1142                                                 char *s = "";
1143
1144                                                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1145                                                         snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1146                                                         len = strlen(bp);
1147                                                         bp += len;
1148                                                         buflen -= len;
1149                                                         s = " ";
1150                                                 }
1151                                         }
1152                                         break;
1153
1154                                         case 'F':
1155                                                 /* %f, and stdout is not-redirected */
1156                                                 xstdout = 1;
1157                                                 /* and fall... */
1158
1159                                         case 'f':
1160                                                 /*
1161                                                 ** insert temporary filename
1162                                                 ** where content should be
1163                                                 ** written
1164                                                 */
1165                                                 snprintf(bp, buflen, "%s", ce->ce_file);
1166                                                 break;
1167
1168                                         case 's':
1169                                                 /* insert content subtype */
1170                                                 strncpy(bp, ci->ci_subtype, buflen);
1171                                                 break;
1172
1173                                         case '%':
1174                                                 /* insert character % */
1175                                                 goto raw;
1176
1177                                         default:
1178                                                 *bp++ = *--cp;
1179                                                 *bp = '\0';
1180                                                 buflen--;
1181                                                 continue;
1182                                         }
1183                                         len = strlen(bp);
1184                                         bp += len;
1185                                         buflen -= len;
1186                                 } else {
1187 raw:
1188                                         *bp++ = *cp;
1189                                         *bp = '\0';
1190                                         buflen--;
1191                                 }
1192                         }
1193
1194                         if (verbosw)
1195                                 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1196
1197                         fflush(stdout);  /* not sure if need for -noverbose */
1198
1199                         vec[0] = "/bin/sh";
1200                         vec[1] = "-c";
1201                         vec[2] = buffer;
1202                         vec[3] = NULL;
1203
1204                         if ((out = fopen(ce->ce_file, "w")) == NULL)
1205                                 adios(ce->ce_file, "unable to open for writing");
1206
1207                         switch (child_id = fork()) {
1208                         case NOTOK:
1209                                 adios("fork", "unable to fork");
1210                                 /* NOTREACHED */
1211
1212                         case OK:
1213                                 if (!xstdout)
1214                                         dup2(fileno(out), 1);
1215                                 close(fileno(out));
1216                                 execvp("/bin/sh", vec);
1217                                 fprintf(stderr, "unable to exec ");
1218                                 perror("/bin/sh");
1219                                 _exit(-1);
1220                                 /* NOTREACHED */
1221
1222                         default:
1223                                 fclose(out);
1224                                 if (pidXwait(child_id, NULL))
1225                                         /* sysexits.h EX_SOFTWARE */
1226                                         exit(1);
1227                                 break;
1228                         }
1229                 }
1230                 break;
1231         }
1232
1233         return OK;
1234 }
1235
1236
1237 /*
1238 ** Scan the content.
1239 **
1240 **    1) choose a transfer encoding.
1241 **    2) check for clashes with multipart boundary string.
1242 **    3) for text content, figure out which character set is being used.
1243 **
1244 ** If there is a clash with one of the contents and the multipart boundary,
1245 ** this function will exit with NOTOK.  This will cause the scanning process
1246 ** to be repeated with a different multipart boundary.  It is possible
1247 ** (although highly unlikely) that this scan will be repeated multiple times.
1248 */
1249
1250 static int
1251 scan_content(CT ct)
1252 {
1253         int len;
1254         int check8bit = 0, contains8bit = 0;
1255         int checklinelen = 0, linelen = 0;
1256         int checkboundary = 0, boundaryclash = 0;
1257         int checklinespace = 0, linespace = 0;  /* trailing whitespace */
1258         unsigned char *cp = NULL, buffer[BUFSIZ];
1259         struct text *t = NULL;
1260         FILE *in = NULL;
1261         CE ce = ct->c_cefile;
1262
1263         /*
1264         ** handle multipart by scanning all subparts
1265         ** and then checking their encoding.
1266         */
1267         if (ct->c_type == CT_MULTIPART) {
1268                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1269                 struct part *part;
1270
1271                 /* initially mark the domain of enclosing multipart as 7bit */
1272                 ct->c_encoding = CE_7BIT;
1273
1274                 for (part = m->mp_parts; part; part = part->mp_next) {
1275                         CT p = part->mp_part;
1276
1277                         if (scan_content(p) == NOTOK) {
1278                                 /* choose encoding for subpart */
1279                                 return NOTOK;
1280                         }
1281
1282                         /*
1283                         ** if necessary, enlarge encoding for enclosing
1284                         ** multipart
1285                         */
1286                         if (p->c_encoding == CE_BINARY)
1287                                 ct->c_encoding = CE_BINARY;
1288                         if (p->c_encoding == CE_8BIT &&
1289                                         ct->c_encoding != CE_BINARY)
1290                                 ct->c_encoding = CE_8BIT;
1291                 }
1292
1293                 return OK;
1294         }
1295
1296         /*
1297         ** Decide what to check while scanning this content.
1298         */
1299         switch (ct->c_type) {
1300         case CT_TEXT:
1301                 check8bit = 1;
1302                 checkboundary = 1;
1303                 if (ct->c_subtype == TEXT_PLAIN) {
1304                         checklinelen = 0;
1305                         checklinespace = 0;
1306                 } else {
1307                         checklinelen = 1;
1308                         checklinespace = 1;
1309                 }
1310                 break;
1311
1312         case CT_MESSAGE:
1313                 check8bit = 0;
1314                 checklinelen = 0;
1315                 checklinespace = 0;
1316                 checkboundary = 1;
1317                 break;
1318
1319         case CT_APPLICATION:
1320         case CT_AUDIO:
1321         case CT_IMAGE:
1322         case CT_VIDEO:
1323                 check8bit = 0;
1324                 checklinelen = 0;
1325                 checklinespace = 0;
1326                 checkboundary = 0;
1327                 break;
1328         }
1329
1330         /*
1331         ** Scan the unencoded content
1332         */
1333         if (check8bit || checklinelen || checklinespace || checkboundary) {
1334                 if ((in = fopen(ce->ce_file, "r")) == NULL)
1335                         adios(ce->ce_file, "unable to open for reading");
1336                 len = strlen(prefix);
1337
1338                 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1339                         if (check8bit) {
1340                                 for (cp = buffer; *cp; cp++) {
1341                                         if (!isascii(*cp)) {
1342                                                 contains8bit = 1;
1343                                                 /* no need to keep checking */
1344                                                 check8bit = 0;
1345                                         }
1346                                 }
1347                         }
1348
1349                         if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1350                                 linelen = 1;
1351                                 checklinelen = 0;  /* no need to keep checking */
1352                         }
1353
1354                         if (checklinespace &&
1355                                         (cp = buffer + strlen(buffer) - 2) >
1356                                         buffer && isspace(*cp)) {
1357                                 linespace = 1;
1358                                 /* no need to keep checking */
1359                                 checklinespace = 0;
1360                         }
1361
1362                         /*
1363                         ** Check if content contains a line that clashes
1364                         ** with our standard boundary for multipart messages.
1365                         */
1366                         if (checkboundary && buffer[0] == '-' &&
1367                                         buffer[1] == '-') {
1368                                 for (cp = buffer + strlen(buffer) - 1;
1369                                                 cp >= buffer; cp--)
1370                                         if (!isspace(*cp))
1371                                                 break;
1372                                 *++cp = '\0';
1373                                 if (strncmp(buffer + 2, prefix, len)==0 &&
1374                                                 isdigit(buffer[2 + len])) {
1375                                         boundaryclash = 1;
1376                                         /* no need to keep checking */
1377                                         checkboundary = 0;
1378                                 }
1379                         }
1380                 }
1381                 fclose(in);
1382         }
1383
1384         /*
1385         ** Decide which transfer encoding to use.
1386         */
1387         switch (ct->c_type) {
1388         case CT_TEXT:
1389                 /*
1390                 ** If the text content didn't specify a character
1391                 ** set, we need to figure out which one was used.
1392                 */
1393                 t = (struct text *) ct->c_ctparams;
1394                 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1395                         CI ci = &ct->c_ctinfo;
1396                         char **ap, **ep;
1397
1398                         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1399                                 continue;
1400
1401                         if (contains8bit) {
1402                                 t->tx_charset = CHARSET_UNKNOWN;
1403                                 *ap = concat("charset=", write_charset_8bit(),
1404                                                 NULL);
1405                         } else {
1406                                 t->tx_charset = CHARSET_USASCII;
1407                                 *ap = getcpy("charset=us-ascii");
1408                         }
1409
1410                         cp = strchr(*ap++, '=');
1411                         *ap = NULL;
1412                         *cp++ = '\0';
1413                         *ep = cp;
1414                 }
1415
1416                 if (contains8bit || linelen || linespace)
1417                         ct->c_encoding = CE_QUOTED;
1418                 else
1419                         ct->c_encoding = CE_7BIT;
1420                 break;
1421
1422         case CT_MESSAGE:
1423                 ct->c_encoding = CE_7BIT;
1424                 break;
1425
1426         case CT_APPLICATION:
1427         case CT_AUDIO:
1428         case CT_IMAGE:
1429         case CT_VIDEO:
1430                 /*
1431                 ** Forcing use of base64, because these types likely
1432                 ** contain binary data and NUL bytes. Don't care about
1433                 ** files that would be clean.
1434                 */
1435                 ct->c_encoding = CE_BASE64;
1436                 break;
1437         }
1438
1439         return (boundaryclash ? NOTOK : OK);
1440 }
1441
1442
1443 /*
1444 ** Scan the content structures, and build header
1445 ** fields that will need to be output into the
1446 ** message.
1447 */
1448
1449 static int
1450 build_headers(CT ct)
1451 {
1452         int cc, len;
1453         char **ap, **ep;
1454         char *np, *vp, buffer[BUFSIZ];
1455         CI ci = &ct->c_ctinfo;
1456
1457         /*
1458         ** If message is type multipart, then add the multipart
1459         ** boundary to the list of attribute/value pairs.
1460         */
1461         if (ct->c_type == CT_MULTIPART) {
1462                 char *cp;
1463                 static int level = 0;  /* store nesting level */
1464
1465                 ap = ci->ci_attrs;
1466                 ep = ci->ci_values;
1467                 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1468                                 prefix, level++);
1469                 cp = strchr(*ap++ = getcpy(buffer), '=');
1470                 *ap = NULL;
1471                 *cp++ = '\0';
1472                 *ep = cp;
1473         }
1474
1475         /*
1476         ** output the content type and subtype
1477         */
1478         np = getcpy(TYPE_FIELD);
1479         vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1480
1481         /* keep track of length of line */
1482         len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1483                         strlen(ci->ci_subtype) + 3;
1484
1485         /*
1486         ** Append the attribute/value pairs to
1487         ** the end of the Content-Type line.
1488         */
1489         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1490                 vp = add(";", vp);
1491                 len++;
1492
1493                 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1494                 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1495                         vp = add("\n\t", vp);
1496                         len = 8;
1497                 } else {
1498                         vp = add(" ", vp);
1499                         len++;
1500                 }
1501                 vp = add(buffer, vp);
1502                 len += cc;
1503         }
1504
1505         /*
1506         ** Append any RFC-822 comment to the end of
1507         ** the Content-Type line.
1508         */
1509         if (ci->ci_comment) {
1510                 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1511                 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1512                         vp = add("\n\t", vp);
1513                         len = 8;
1514                 } else {
1515                         vp = add(" ", vp);
1516                         len++;
1517                 }
1518                 vp = add(buffer, vp);
1519                 len += cc;
1520         }
1521         vp = add("\n", vp);
1522         add_header(ct, np, vp);
1523
1524         /*
1525         ** output the Content-ID
1526         */
1527         if (ct->c_id) {
1528                 np = getcpy(ID_FIELD);
1529                 vp = concat(" ", ct->c_id, NULL);
1530                 add_header(ct, np, vp);
1531         }
1532
1533         /*
1534         ** output the Content-Description
1535         */
1536         if (ct->c_descr) {
1537                 np = getcpy(DESCR_FIELD);
1538                 vp = concat(" ", ct->c_descr, NULL);
1539                 add_header(ct, np, vp);
1540         }
1541
1542         /*
1543         ** output the Content-Disposition
1544         */
1545         if (ct->c_dispo) {
1546                 np = getcpy(DISPO_FIELD);
1547                 vp = concat(" ", ct->c_dispo, NULL);
1548                 add_header(ct, np, vp);
1549         }
1550
1551         /*
1552         ** output the Content-Transfer-Encoding
1553         */
1554         switch (ct->c_encoding) {
1555         case CE_7BIT:
1556                 /* Nothing to output */
1557                 break;
1558
1559         case CE_8BIT:
1560                 if (ct->c_type == CT_MESSAGE)
1561                         adios(NULL, "internal error, invalid encoding");
1562
1563                 np = getcpy(ENCODING_FIELD);
1564                 vp = concat(" ", "8bit", "\n", NULL);
1565                 add_header(ct, np, vp);
1566                 break;
1567
1568         case CE_QUOTED:
1569                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1570                         adios(NULL, "internal error, invalid encoding");
1571
1572                 np = getcpy(ENCODING_FIELD);
1573                 vp = concat(" ", "quoted-printable", "\n", NULL);
1574                 add_header(ct, np, vp);
1575                 break;
1576
1577         case CE_BASE64:
1578                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1579                         adios(NULL, "internal error, invalid encoding");
1580
1581                 np = getcpy(ENCODING_FIELD);
1582                 vp = concat(" ", "base64", "\n", NULL);
1583                 add_header(ct, np, vp);
1584                 break;
1585
1586         case CE_BINARY:
1587                 if (ct->c_type == CT_MESSAGE)
1588                         adios(NULL, "internal error, invalid encoding");
1589
1590                 np = getcpy(ENCODING_FIELD);
1591                 vp = concat(" ", "binary", "\n", NULL);
1592                 add_header(ct, np, vp);
1593                 break;
1594
1595         default:
1596                 adios(NULL, "unknown transfer encoding in content");
1597                 break;
1598         }
1599
1600         /*
1601         ** Additional content specific header processing
1602         */
1603         switch (ct->c_type) {
1604         case CT_MULTIPART:
1605         {
1606                 struct multipart *m;
1607                 struct part *part;
1608
1609                 m = (struct multipart *) ct->c_ctparams;
1610                 for (part = m->mp_parts; part; part = part->mp_next) {
1611                         CT p;
1612
1613                         p = part->mp_part;
1614                         build_headers(p);
1615                 }
1616         }
1617                 break;
1618
1619         default:
1620                 /* Nothing to do */
1621                 break;
1622         }
1623
1624         return OK;
1625 }