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 <h/signals.h>
  19 #include <errno.h>
  20 #include <signal.h>
  21 #include <h/tws.h>
  22 #include <h/mime.h>
  23 #include <h/mhparse.h>
  24 #include <h/utils.h>
  25
  26 #ifdef HAVE_SYS_TIME_H
  27 # include <sys/time.h>
  28 #endif
  29 #include <time.h>
  30
  31 static struct swit switches[] = {
  32 #define VERBSW  0
  33         { "verbose", 0 },
  34 #define NVERBSW  1
  35         { "noverbose", 0 },
  36 #define VERSIONSW  2
  37         { "Version", 0 },
  38 #define HELPSW  3
  39         { "help", 0 },
  40 #define DEBUGSW  4
  41         { "debug", -5 },
  42         { NULL, 0 }
  43 };
  44
  45
  46 /*
  47 ** Directory to place tmp files.  This must
  48 ** be set before these routines are called.
  49 */
  50 char *tmp;
  51
  52 pid_t xpid = 0;
  53
  54 static char prefix[] = "----- =_aaaaaaaaaa";
  55
  56
  57 /*
  58 ** prototypes
  59 */
  60
  61 /* mhmisc.c */
  62 int make_intermediates(char *);
  63 void content_error(char *, CT, char *, ...);
  64
  65 /* mhfree.c */
  66 void free_content(CT);
  67 void free_ctinfo(CT);
  68 void free_encoding(CT, int);
  69
  70 /*
  71 ** static prototypes
  72 */
  73 static int init_decoded_content(CT);
  74 static char *fgetstr(char *, int, FILE *);
  75 static int user_content(FILE *, char *, char *, CT *);
  76 static void set_id(CT, int);
  77 static int compose_content(CT);
  78 static int scan_content(CT);
  79 static int build_headers(CT);
  80 static CT build_mime(char *);
  81
  82
  83 int debugsw = 0;
  84 int verbosw = 0;
  85
  86 /*
  87 ** Temporary files
  88 */
  89 static char infile[BUFSIZ];
  90 static int unlink_infile  = 0;
  91
  92 static char outfile[BUFSIZ];
  93 static int unlink_outfile = 0;
  94
  95 static void unlink_done(int) NORETURN;
  96
  97 /* mhoutsbr.c */
  98 int output_message(CT, char *);
  99 int output_message_fp(CT, FILE *, char*);
 100
 101 /* mhmisc.c */
 102 void set_endian(void);
 103
 104 /* mhfree.c */
 105 void free_content(CT);
 106
 107
 108 int
 109 main(int argc, char **argv)
 110 {
 111         char *cp, buf[BUFSIZ];
 112         char buffer[BUFSIZ], *compfile = NULL;
 113         char **argp, **arguments;
 114         CT ct, cts[2];
 115         FILE *fp = NULL;
 116         FILE *fp_out = NULL;
 117
 118         done = unlink_done;
 119
 120 #ifdef LOCALE
 121         setlocale(LC_ALL, "");
 122 #endif
 123         invo_name = mhbasename(argv[0]);
 124
 125         /* read user profile/context */
 126         context_read();
 127
 128         arguments = getarguments(invo_name, argc, argv, 1);
 129         argp = arguments;
 130
 131         while ((cp = *argp++)) {
 132                 if (cp[0] == '-' && cp[1] == '\0') {
 133                         if (compfile)
 134                                 adios(NULL, "cannot specify both standard input and a file");
 135                         else
 136                                 compfile = cp;
 137                         verbosw = 0;  /* turn off -verbose listings */
 138                         break;
 139                 }
 140                 if (*cp == '-') {
 141                         switch (smatch(++cp, switches)) {
 142                         case AMBIGSW:
 143                                 ambigsw(cp, switches);
 144                                 done(1);
 145                         case UNKWNSW:
 146                                 adios(NULL, "-%s unknown", cp);
 147
 148                         case HELPSW:
 149                                 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
 150                                 print_help(buf, switches, 1);
 151                                 done(1);
 152                         case VERSIONSW:
 153                                 print_version(invo_name);
 154                                 done(1);
 155
 156                         case VERBSW:
 157                                 verbosw++;
 158                                 continue;
 159                         case NVERBSW:
 160                                 verbosw = 0;
 161                                 continue;
 162                         case DEBUGSW:
 163                                 debugsw = 1;
 164                                 continue;
 165                         }
 166                 }
 167                 if (compfile)
 168                         adios(NULL, "only one composition file allowed");
 169                 else
 170                         compfile = cp;
 171         }
 172
 173         set_endian();
 174
 175         /*
 176         ** Check if we've specified an additional profile
 177         */
 178         if ((cp = getenv("MHBUILD"))) {
 179                 if ((fp = fopen(cp, "r"))) {
 180                         readconfig((struct node **) 0, fp, cp, 0);
 181                         fclose(fp);
 182                 } else {
 183                         admonish("", "unable to read $MHBUILD profile (%s)",
 184                                         cp);
 185                 }
 186         }
 187
 188         /*
 189         ** Read the standard profile setup
 190         */
 191         if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
 192                 readconfig((struct node **) 0, fp, cp, 0);
 193                 fclose(fp);
 194         }
 195
 196         /*
 197         ** Check for storage directory.  If defined, we
 198         ** will store temporary files there.  Else we
 199         ** store them in standard nmh directory.
 200         */
 201         if ((cp = context_find(nmhstorage)) && *cp)
 202                 tmp = concat(cp, "/", invo_name, NULL);
 203         else
 204                 tmp = getcpy(toabsdir(invo_name));
 205
 206         /* Check if we have a file to process */
 207         if (!compfile)
 208                 adios(NULL, "need to specify a %s composition file",
 209                                 invo_name);
 210
 211         /*
 212         ** Process the composition file from standard input.
 213         */
 214         if (compfile[0] == '-' && compfile[1] == '\0') {
 215                 /* copy standard input to temporary file */
 216                 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
 217                                 sizeof(infile));
 218                 while (fgets(buffer, BUFSIZ, stdin))
 219                         fputs(buffer, fp);
 220                 fclose(fp);
 221                 unlink_infile = 1;
 222
 223                 /* build the content structures for MIME message */
 224                 ct = build_mime(infile);
 225                 cts[0] = ct;
 226                 cts[1] = NULL;
 227
 228                 /* output MIME message to this temporary file */
 229                 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
 230                                 sizeof(outfile));
 231                 unlink_outfile = 1;
 232
 233                 /* output the message */
 234                 output_message_fp(ct, fp_out, outfile);
 235                 fclose(fp_out);
 236
 237                 /* output the temp file to standard output */
 238                 if ((fp = fopen(outfile, "r")) == NULL)
 239                         adios(outfile, "unable to open");
 240                 while (fgets(buffer, BUFSIZ, fp))
 241                         fputs(buffer, stdout);
 242                 fclose(fp);
 243
 244                 unlink(infile);
 245                 unlink_infile = 0;
 246
 247                 unlink(outfile);
 248                 unlink_outfile = 0;
 249
 250                 free_content(ct);
 251                 done(0);
 252         }
 253
 254         /*
 255         ** Process the composition file from a file.
 256         */
 257
 258         /* build the content structures for MIME message */
 259         ct = build_mime(compfile);
 260         cts[0] = ct;
 261         cts[1] = NULL;
 262
 263         /* output MIME message to this temporary file */
 264         strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
 265                         sizeof(outfile));
 266         unlink_outfile = 1;
 267
 268         /* output the message */
 269         output_message_fp(ct, fp_out, outfile);
 270         fclose(fp_out);
 271
 272         /* Rename composition draft */
 273         snprintf(buffer, sizeof(buffer), "%s.orig", m_backup(compfile));
 274         if (rename(compfile, buffer) == NOTOK) {
 275                 adios(compfile, "unable to rename comp draft %s to", buffer);
 276         }
 277
 278         /* Rename output file to take its place */
 279         if (rename(outfile, compfile) == NOTOK) {
 280                 advise(outfile, "unable to rename output %s to", compfile);
 281                 rename(buffer, compfile);
 282                 done(1);
 283         }
 284         unlink_outfile = 0;
 285
 286         free_content(ct);
 287         done(0);
 288         return 1;
 289 }
 290
 291
 292 static void
 293 unlink_done(int status)
 294 {
 295         /*
 296         ** Check if we need to remove stray temporary files.
 297         */
 298         if (unlink_infile)
 299                 unlink(infile);
 300         if (unlink_outfile)
 301                 unlink(outfile);
 302
 303         exit(status);
 304 }
 305
 306 /*
 307 ** Main routine for translating composition file
 308 ** into valid MIME message.  It translates the draft
 309 ** into a content structure (actually a tree of content
 310 ** structures).  This message then can be manipulated
 311 ** in various ways, including being output via
 312 ** output_message().
 313 */
 314 static CT
 315 build_mime(char *infile)
 316 {
 317         int compnum, state;
 318         char buf[BUFSIZ], name[NAMESZ];
 319         char *cp, *np, *vp;
 320         struct multipart *m;
 321         struct part **pp;
 322         CT ct;
 323         FILE *in;
 324
 325         umask(~m_gmprot());
 326
 327         /* open the composition draft */
 328         if ((in = fopen(infile, "r")) == NULL)
 329                 adios(infile, "unable to open for reading");
 330
 331         /*
 332         ** Allocate space for primary (outside) content
 333         */
 334         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 335                 adios(NULL, "out of memory");
 336
 337         /*
 338         ** Allocate structure for handling decoded content
 339         ** for this part.  We don't really need this, but
 340         ** allocate it to remain consistent.
 341         */
 342         init_decoded_content(ct);
 343
 344         /*
 345         ** Parse some of the header fields in the composition
 346         ** draft into the linked list of header fields for
 347         ** the new MIME message.
 348         */
 349         for (compnum = 1, state = FLD;;) {
 350                 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
 351                 case FLD:
 352                 case FLDPLUS:
 353                 case FLDEOF:
 354                         compnum++;
 355
 356                         /* abort if draft has Mime-Version header field */
 357                         if (!mh_strcasecmp(name, VRSN_FIELD))
 358                                 adios(NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
 359
 360                         /*
 361                         ** abort if draft has Content-Transfer-Encoding
 362                         ** header field
 363                         */
 364                         if (!mh_strcasecmp(name, ENCODING_FIELD))
 365                                 adios(NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
 366
 367                         /* ignore any Content-Type fields in the header */
 368                         if (!mh_strcasecmp(name, TYPE_FIELD)) {
 369                                 while (state == FLDPLUS)
 370                                         state = m_getfld(state, name, buf,
 371                                                         sizeof(buf), in);
 372                                 goto finish_field;
 373                         }
 374
 375                         /* get copies of the buffers */
 376                         np = getcpy(name);
 377                         vp = getcpy(buf);
 378
 379                         /* if necessary, get rest of field */
 380                         while (state == FLDPLUS) {
 381                                 state = m_getfld(state, name, buf,
 382                                                 sizeof(buf), in);
 383                                 vp = add(buf, vp);  /* add to prev value */
 384                         }
 385
 386                         /* Now add the header data to the list */
 387                         add_header(ct, np, vp);
 388
 389 finish_field:
 390                         /* if this wasn't the last hdr field, then continue */
 391                         if (state != FLDEOF)
 392                                 continue;
 393                         /* else fall... */
 394
 395                 case FILEEOF:
 396                         adios(NULL, "draft has empty body -- no directives!");
 397                         /* NOTREACHED */
 398
 399                 case BODY:
 400                 case BODYEOF:
 401                         fseek(in, (long) (-strlen(buf)), SEEK_CUR);
 402                         break;
 403
 404                 case LENERR:
 405                 case FMTERR:
 406                         adios(NULL, "message format error in component #%d",
 407                                         compnum);
 408
 409                 default:
 410                         adios(NULL, "getfld() returned %d", state);
 411                 }
 412                 break;
 413         }
 414
 415         /*
 416         ** Now add the MIME-Version header field
 417         ** to the list of header fields.
 418         */
 419         np = getcpy(VRSN_FIELD);
 420         vp = concat(" ", VRSN_VALUE, "\n", NULL);
 421         add_header(ct, np, vp);
 422
 423         /*
 424         ** We initally assume we will find multiple contents in the
 425         ** draft.  So create a multipart/mixed content to hold everything.
 426         ** We can remove this later, if it is not needed.
 427         */
 428         if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK)
 429                 done(1);
 430         ct->c_type = CT_MULTIPART;
 431         ct->c_subtype = MULTI_MIXED;
 432         ct->c_file = getcpy(infile);
 433
 434         if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
 435                 adios(NULL, "out of memory");
 436         ct->c_ctparams = (void *) m;
 437         pp = &m->mp_parts;
 438
 439         /*
 440         ** read and parse the composition file
 441         ** and the directives it contains.
 442         */
 443         while (fgetstr(buf, sizeof(buf) - 1, in)) {
 444                 struct part *part;
 445                 CT p;
 446
 447                 if (user_content(in, infile, buf, &p) == DONE) {
 448                         admonish(NULL, "ignoring spurious #end");
 449                         continue;
 450                 }
 451                 if (!p)
 452                         continue;
 453
 454                 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 455                         adios(NULL, "out of memory");
 456                 *pp = part;
 457                 pp = &part->mp_next;
 458                 part->mp_part = p;
 459         }
 460
 461         /*
 462         ** close the composition draft since
 463         ** it's not needed any longer.
 464         */
 465         fclose(in);
 466
 467         /* check if any contents were found */
 468         if (!m->mp_parts)
 469                 adios(NULL, "no content directives found");
 470
 471         /*
 472         ** If only one content was found, then remove and
 473         ** free the outer multipart content.
 474         */
 475         if (!m->mp_parts->mp_next) {
 476                 CT p;
 477
 478                 p = m->mp_parts->mp_part;
 479                 m->mp_parts->mp_part = NULL;
 480
 481                 /* move header fields */
 482                 p->c_first_hf = ct->c_first_hf;
 483                 p->c_last_hf = ct->c_last_hf;
 484                 ct->c_first_hf = NULL;
 485                 ct->c_last_hf = NULL;
 486
 487                 free_content(ct);
 488                 ct = p;
 489         } else {
 490                 set_id(ct, 1);
 491         }
 492
 493         /*
 494         ** Fill out, or expand directives.  Parse and execute
 495         ** commands specified by profile composition strings.
 496         */
 497         compose_content(ct);
 498
 499         if ((cp = strchr(prefix, 'a')) == NULL)
 500                 adios(NULL, "internal error(4)");
 501
 502         /*
 503         ** Scan the contents.  Choose a transfer encoding, and
 504         ** check if prefix for multipart boundary clashes with
 505         ** any of the contents.
 506         */
 507         while (scan_content(ct) == NOTOK) {
 508                 if (*cp < 'z') {
 509                         (*cp)++;
 510                 } else {
 511                         if (*++cp == 0)
 512                                 adios(NULL, "giving up trying to find a unique delimiter string");
 513                                 else
 514                                 (*cp)++;
 515                 }
 516         }
 517
 518         /* Build the rest of the header field structures */
 519         build_headers(ct);
 520
 521         return ct;
 522 }
 523
 524
 525 /*
 526 ** Set up structures for placing unencoded
 527 ** content when building parts.
 528 */
 529
 530 static int
 531 init_decoded_content(CT ct)
 532 {
 533         CE ce;
 534
 535         if ((ce = (CE) calloc(1, sizeof(*ce))) == NULL)
 536                 adios(NULL, "out of memory");
 537
 538         ct->c_cefile     = ce;
 539         ct->c_ceopenfnx  = open7Bit;  /* since unencoded */
 540         ct->c_ceclosefnx = close_encoding;
 541         ct->c_cesizefnx  = NULL;  /* since unencoded */
 542
 543         return OK;
 544 }
 545
 546
 547 static char *
 548 fgetstr(char *s, int n, FILE *stream)
 549 {
 550         char *cp, *ep;
 551
 552         for (ep = (cp = s) + n; cp < ep; ) {
 553                 int i;
 554
 555                 if (!fgets(cp, n, stream))
 556                         return (cp != s ? s : NULL);
 557                 if (cp == s && *cp != '#')
 558                         return s;
 559
 560                 cp += (i = strlen(cp)) - 1;
 561                 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
 562                         break;
 563                 *cp = '\0';
 564                 n -= (i - 2);
 565         }
 566
 567         return s;
 568 }
 569
 570
 571 /*
 572 ** Parse the composition draft for text and directives.
 573 ** Do initial setup of Content structure.
 574 */
 575
 576 static int
 577 user_content(FILE *in, char *file, char *buf, CT *ctp)
 578 {
 579         int vrsn;
 580         unsigned char *cp;
 581         char **ap;
 582         char buffer[BUFSIZ];
 583         struct multipart *m;
 584         struct part **pp;
 585         struct str2init *s2i;
 586         CI ci;
 587         CT ct;
 588         CE ce;
 589
 590         if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
 591                 *ctp = NULL;
 592                 return OK;
 593         }
 594
 595         /* allocate basic Content structure */
 596         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 597                 adios(NULL, "out of memory");
 598         *ctp = ct;
 599
 600         /* allocate basic structure for handling decoded content */
 601         init_decoded_content(ct);
 602         ce = ct->c_cefile;
 603
 604         ci = &ct->c_ctinfo;
 605         set_id(ct, 0);
 606
 607         /*
 608         ** Handle inline text.  Check if line
 609         ** is one of the following forms:
 610         **
 611         ** 1) doesn't begin with '#'  (implicit directive)
 612         ** 2) begins with "##"        (implicit directive)
 613         ** 3) begins with "#<"
 614         */
 615         if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
 616                 int headers;
 617                 int inlineD;
 618                 long pos;
 619                 char content[BUFSIZ];
 620                 FILE *out;
 621                 char *cp;
 622
 623                 cp = m_mktemp2(NULL, invo_name, NULL, &out);
 624                 if (cp == NULL)
 625                         adios("mhbuild", "unable to create temporary file");
 626
 627                 /* use a temp file to collect the plain text lines */
 628                 ce->ce_file = getcpy(cp);
 629                 ce->ce_unlink = 1;
 630
 631                 if (buf[0] == '#' && buf[1] == '<') {
 632                         strncpy(content, buf + 2, sizeof(content));
 633                         inlineD = 1;
 634                         goto rock_and_roll;
 635                 } else {
 636                         inlineD = 0;
 637                 }
 638
 639                 /* the directive is implicit */
 640                 strncpy(content, "text/plain", sizeof(content));
 641                 headers = 0;
 642                 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
 643                 for (;;) {
 644                         int i;
 645
 646                         if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
 647                                         buffer[i=strlen(DESCR_FIELD)] == ':') {
 648                                 headers = 1;
 649
 650 again_descr:
 651                                 ct->c_descr = add(buffer + i + 1, ct->c_descr);
 652                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 653                                         adios(NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
 654                                 switch (buffer[0]) {
 655                                 case ' ':
 656                                 case '\t':
 657                                         i = -1;
 658                                         goto again_descr;
 659
 660                                 case '#':
 661                                         adios(NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
 662                                         /* NOTREACHED */
 663
 664                                 default:
 665                                         break;
 666                                 }
 667                         }
 668
 669                         if (headers >= 0 && uprf(buffer, DISPO_FIELD)
 670                                 && buffer[i = strlen(DISPO_FIELD)] == ':') {
 671                                 headers = 1;
 672
 673 again_dispo:
 674                                 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
 675                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 676                                         adios(NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
 677                                 switch (buffer[0]) {
 678                                 case ' ':
 679                                 case '\t':
 680                                         i = -1;
 681                                         goto again_dispo;
 682
 683                                 case '#':
 684                                         adios(NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
 685                                         /* NOTREACHED */
 686
 687                                 default:
 688                                         break;
 689                                 }
 690                         }
 691
 692                         if (headers != 1 || buffer[0] != '\n')
 693                                 fputs(buffer, out);
 694
 695 rock_and_roll:
 696                         headers = -1;
 697                         pos = ftell(in);
 698                         if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
 699                                         == NULL)
 700                                 break;
 701                         if (buffer[0] == '#') {
 702                                 char *bp;
 703
 704                                 if (buffer[1] != '#')
 705                                         break;
 706                                 for (cp = (bp = buffer) + 1; *cp; cp++)
 707                                         *bp++ = *cp;
 708                                 *bp = '\0';
 709                         }
 710                 }
 711
 712                 fclose(out);
 713
 714                 /* parse content type */
 715                 if (get_ctinfo(content, ct, inlineD) == NOTOK)
 716                         done(1);
 717
 718                 for (s2i = str2cts; s2i->si_key; s2i++)
 719                         if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 720                                 break;
 721                 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
 722                         s2i++;
 723
 724                 /*
 725                 ** check type specified (possibly implicitly)
 726                 */
 727                 switch (ct->c_type = s2i->si_val) {
 728                 case CT_MESSAGE:
 729                         if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
 730                                 ct->c_encoding = CE_7BIT;
 731                                 goto call_init;
 732                         }
 733                         /* else fall... */
 734                 case CT_MULTIPART:
 735                         adios(NULL, "it doesn't make sense to define an in-line %s content",
 736                                         ct->c_type == CT_MESSAGE ? "message" :
 737                                         "multipart");
 738                         /* NOTREACHED */
 739
 740                 default:
 741 call_init:
 742                         if ((ct->c_ctinitfnx = s2i->si_init))
 743                                 (*ct->c_ctinitfnx) (ct);
 744                         break;
 745                 }
 746
 747                 if (cp)
 748                         fseek(in, pos, SEEK_SET);
 749                 return OK;
 750         }
 751
 752         /*
 753         ** If we've reached this point, the next line
 754         ** must be some type of explicit directive.
 755         */
 756
 757         if (buf[1] == '@') {
 758                 adios(NULL, "The #@ directive i.e. message/external-body "
 759                                 "is not supported anymore.");
 760         }
 761
 762         /* parse directive */
 763         if (get_ctinfo(buf+1, ct, 1) == NOTOK)
 764                 done(1);
 765
 766         /* check directive against the list of MIME types */
 767         for (s2i = str2cts; s2i->si_key; s2i++)
 768                 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 769                         break;
 770
 771         /*
 772         ** Check if the directive specified a valid type.
 773         ** This will happen if it was one of the following forms:
 774         **
 775         **    #type/subtype
 776         */
 777         if (s2i->si_key) {
 778                 if (!ci->ci_subtype)
 779                         adios(NULL, "missing subtype in \"#%s\"", ci->ci_type);
 780
 781                 switch (ct->c_type = s2i->si_val) {
 782                 case CT_MULTIPART:
 783                         adios(NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 784                         /* NOTREACHED */
 785
 786                 case CT_MESSAGE:
 787                         if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
 788                                         !mh_strcasecmp(ci->ci_subtype,
 789                                         "external-body")) {
 790                                 adios(NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
 791                         }
 792 use_forw:
 793                         adios(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 794                         /* NOTREACHED */
 795
 796                 default:
 797                         if ((ct->c_ctinitfnx = s2i->si_init))
 798                                 (*ct->c_ctinitfnx) (ct);
 799                         break;
 800                 }
 801
 802                 /* Handle [file] argument */
 803                 if (ci->ci_magic) {
 804                         /* check if specifies command to execute */
 805                         if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
 806                                 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
 807                                         continue;
 808                                 if (!*cp)
 809                                         adios(NULL, "empty pipe command for #%s directive", ci->ci_type);
 810                                 cp = getcpy(cp);
 811                                 free(ci->ci_magic);
 812                                 ci->ci_magic = cp;
 813                         } else {
 814                                 /* record filename of decoded contents */
 815                                 ce->ce_file = ci->ci_magic;
 816                                 if (access(ce->ce_file, R_OK) == NOTOK)
 817                                         adios("reading", "unable to access %s for", ce->ce_file);
 818                                 ci->ci_magic = NULL;
 819                         }
 820                         return OK;
 821                 }
 822
 823                 /*
 824                 ** No [file] argument, so check profile for
 825                 ** method to compose content.
 826                 */
 827                 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
 828                                 invo_name, ci->ci_type, ci->ci_subtype);
 829                 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
 830                         snprintf(buffer, sizeof(buffer), "%s-compose-%s",
 831                                         invo_name, ci->ci_type);
 832                         if ((cp = context_find(buffer)) == NULL ||
 833                                         *cp == '\0') {
 834                                 content_error(NULL, ct, "don't know how to compose content");
 835                                 done(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                                         done(1);
 888                 }
 889                 free(folder);
 890                 free_ctinfo(ct);
 891
 892                 /*
 893                 ** If there is more than one message to include, make this
 894                 ** a content of type "multipart/digest" and insert each message
 895                 ** as a subpart.  If there is only one message, then make this
 896                 ** a content of type "message/rfc822".
 897                 */
 898                 if (mp->numsel > 1) {
 899                         /* we are forwarding multiple messages */
 900                         if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
 901                                 done(1);
 902                         ct->c_type = CT_MULTIPART;
 903                         ct->c_subtype = MULTI_DIGEST;
 904
 905                         if ((m = (struct multipart *)
 906                                         calloc(1, sizeof(*m))) == NULL)
 907                                 adios(NULL, "out of memory");
 908                         ct->c_ctparams = (void *) m;
 909                         pp = &m->mp_parts;
 910
 911                         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 912                                 if (is_selected(mp, msgnum)) {
 913                                         struct part *part;
 914                                         CT p;
 915                                         CE pe;
 916
 917                                         if ((p = (CT) calloc(1, sizeof(*p)))
 918                                                         == NULL)
 919                                                 adios(NULL, "out of memory");
 920                                         init_decoded_content(p);
 921                                         pe = p->c_cefile;
 922                                         if (get_ctinfo("message/rfc822", p, 0)
 923                                                         == NOTOK)
 924                                                 done(1);
 925                                         p->c_type = CT_MESSAGE;
 926                                         p->c_subtype = MESSAGE_RFC822;
 927
 928                                         snprintf(buffer, sizeof(buffer),
 929                                                         "%s/%d", mp->foldpath,
 930                                                         msgnum);
 931                                         pe->ce_file = getcpy(buffer);
 932
 933                                         if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 934                                                 adios(NULL, "out of memory");
 935                                         *pp = part;
 936                                         pp = &part->mp_next;
 937                                         part->mp_part = p;
 938                                 }
 939                         }
 940                 } else {
 941                         /* we are forwarding one message */
 942                         if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
 943                                 done(1);
 944                         ct->c_type = CT_MESSAGE;
 945                         ct->c_subtype = MESSAGE_RFC822;
 946
 947                         msgnum = mp->lowsel;
 948                         snprintf(buffer, sizeof(buffer), "%s/%d",
 949                                         mp->foldpath, msgnum);
 950                         ce->ce_file = getcpy(buffer);
 951                 }
 952
 953                 folder_free(mp);  /* free folder/message structure */
 954                 return OK;
 955         }
 956
 957         /*
 958         ** #end
 959         */
 960         if (!mh_strcasecmp(ci->ci_type, "end")) {
 961                 free_content(ct);
 962                 *ctp = NULL;
 963                 return DONE;
 964         }
 965
 966         /*
 967         ** #begin [ alternative | parallel ]
 968         */
 969         if (!mh_strcasecmp(ci->ci_type, "begin")) {
 970                 if (!ci->ci_magic) {
 971                         vrsn = MULTI_MIXED;
 972                         cp = SubMultiPart[vrsn - 1].kv_key;
 973                 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
 974                         vrsn = MULTI_ALTERNATE;
 975                         cp = SubMultiPart[vrsn - 1].kv_key;
 976                 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
 977                         vrsn = MULTI_PARALLEL;
 978                         cp = SubMultiPart[vrsn - 1].kv_key;
 979                 } else if (uprf(ci->ci_magic, "digest")) {
 980                         goto use_forw;
 981                 } else {
 982                         vrsn = MULTI_UNKNOWN;
 983                         cp = ci->ci_magic;
 984                 }
 985
 986                 free_ctinfo(ct);
 987                 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
 988                 if (get_ctinfo(buffer, ct, 0) == NOTOK)
 989                         done(1);
 990                 ct->c_type = CT_MULTIPART;
 991                 ct->c_subtype = vrsn;
 992
 993                 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
 994                         adios(NULL, "out of memory");
 995                 ct->c_ctparams = (void *) m;
 996
 997                 pp = &m->mp_parts;
 998                 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
 999                         struct part *part;
1000                         CT p;
1001
1002                         if (user_content(in, file, buffer, &p) == DONE) {
1003                                 if (!m->mp_parts)
1004                                         adios(NULL, "empty \"#begin ... #end\" sequence");
1005                                 return OK;
1006                         }
1007                         if (!p)
1008                                 continue;
1009
1010                         if ((part = (struct part *)
1011                                         calloc(1, sizeof(*part))) == NULL)
1012                                 adios(NULL, "out of memory");
1013                         *pp = part;
1014                         pp = &part->mp_next;
1015                         part->mp_part = p;
1016                 }
1017                 admonish(NULL, "premature end-of-file, missing #end");
1018                 return OK;
1019         }
1020
1021         /*
1022         ** Unknown directive
1023         */
1024         adios(NULL, "unknown directive \"#%s\"", ci->ci_type);
1025         return NOTOK;  /* NOT REACHED */
1026 }
1027
1028
1029 static void
1030 set_id(CT ct, int top)
1031 {
1032         char msgid[BUFSIZ];
1033         static int partno;
1034         static time_t clock = 0;
1035         static char *msgfmt;
1036
1037         if (clock == 0) {
1038                 time(&clock);
1039                 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1040                                 (int) getpid(), (long) clock, LocalName());
1041                 partno = 0;
1042                 msgfmt = getcpy(msgid);
1043         }
1044         snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1045         ct->c_id = getcpy(msgid);
1046 }
1047
1048
1049 /*
1050 ** Fill out, or expand the various contents in the composition
1051 ** draft.  Read-in any necessary files.  Parse and execute any
1052 ** commands specified by profile composition strings.
1053 */
1054
1055 static int
1056 compose_content(CT ct)
1057 {
1058         CE ce = ct->c_cefile;
1059
1060         switch (ct->c_type) {
1061         case CT_MULTIPART:
1062         {
1063                 int partnum;
1064                 char *pp;
1065                 char partnam[BUFSIZ];
1066                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1067                 struct part *part;
1068
1069                 if (ct->c_partno) {
1070                         snprintf(partnam, sizeof(partnam), "%s.",
1071                                         ct->c_partno);
1072                         pp = partnam + strlen(partnam);
1073                 } else {
1074                         pp = partnam;
1075                 }
1076
1077                 /* first, we call compose_content on all the subparts */
1078                 for (part = m->mp_parts, partnum = 1; part;
1079                                 part = part->mp_next, partnum++) {
1080                         CT p = part->mp_part;
1081
1082                         sprintf(pp, "%d", partnum);
1083                         p->c_partno = getcpy(partnam);
1084                         if (compose_content(p) == NOTOK)
1085                                 return NOTOK;
1086                 }
1087         }
1088         break;
1089
1090         case CT_MESSAGE:
1091                 /* Nothing to do for type message */
1092                 break;
1093
1094         /*
1095         ** Discrete types (text/application/audio/image/video)
1096         */
1097         default:
1098                 if (!ce->ce_file) {
1099                         pid_t child_id;
1100                         int xstdout, len, buflen;
1101                         char *bp, **ap, *cp;
1102                         char *vec[4], buffer[BUFSIZ];
1103                         FILE *out;
1104                         CI ci = &ct->c_ctinfo;
1105                         char *tfile = NULL;
1106
1107                         if (!(cp = ci->ci_magic))
1108                                 adios(NULL, "internal error(5)");
1109
1110                         tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1111                         if (tfile == NULL) {
1112                                 adios("mhbuild", "unable to create temporary file");
1113                         }
1114                         ce->ce_file = getcpy(tfile);
1115                         ce->ce_unlink = 1;
1116
1117                         xstdout = 0;
1118
1119                         /* Get buffer ready to go */
1120                         bp = buffer;
1121                         bp[0] = '\0';
1122                         buflen = sizeof(buffer);
1123
1124                         /*
1125                         ** Parse composition string into buffer
1126                         */
1127                         for ( ; *cp; cp++) {
1128                                 if (*cp == '%') {
1129                                         switch (*++cp) {
1130                                         case 'a':
1131                                         {
1132                                                 /*
1133                                                 ** insert parameters from
1134                                                 ** directive
1135                                                 */
1136                                                 char **ep;
1137                                                 char *s = "";
1138
1139                                                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1140                                                         snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1141                                                         len = strlen(bp);
1142                                                         bp += len;
1143                                                         buflen -= len;
1144                                                         s = " ";
1145                                                 }
1146                                         }
1147                                         break;
1148
1149                                         case 'F':
1150                                                 /* %f, and stdout is not-redirected */
1151                                                 xstdout = 1;
1152                                                 /* and fall... */
1153
1154                                         case 'f':
1155                                                 /*
1156                                                 ** insert temporary filename
1157                                                 ** where content should be
1158                                                 ** written
1159                                                 */
1160                                                 snprintf(bp, buflen, "%s", ce->ce_file);
1161                                                 break;
1162
1163                                         case 's':
1164                                                 /* insert content subtype */
1165                                                 strncpy(bp, ci->ci_subtype, buflen);
1166                                                 break;
1167
1168                                         case '%':
1169                                                 /* insert character % */
1170                                                 goto raw;
1171
1172                                         default:
1173                                                 *bp++ = *--cp;
1174                                                 *bp = '\0';
1175                                                 buflen--;
1176                                                 continue;
1177                                         }
1178                                         len = strlen(bp);
1179                                         bp += len;
1180                                         buflen -= len;
1181                                 } else {
1182 raw:
1183                                         *bp++ = *cp;
1184                                         *bp = '\0';
1185                                         buflen--;
1186                                 }
1187                         }
1188
1189                         if (verbosw)
1190                                 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1191
1192                         fflush(stdout);  /* not sure if need for -noverbose */
1193
1194                         vec[0] = "/bin/sh";
1195                         vec[1] = "-c";
1196                         vec[2] = buffer;
1197                         vec[3] = NULL;
1198
1199                         if ((out = fopen(ce->ce_file, "w")) == NULL)
1200                                 adios(ce->ce_file, "unable to open for writing");
1201
1202                         switch (child_id = fork()) {
1203                         case NOTOK:
1204                                 adios("fork", "unable to fork");
1205                                 /* NOTREACHED */
1206
1207                         case OK:
1208                                 if (!xstdout)
1209                                         dup2(fileno(out), 1);
1210                                 close(fileno(out));
1211                                 execvp("/bin/sh", vec);
1212                                 fprintf(stderr, "unable to exec ");
1213                                 perror("/bin/sh");
1214                                 _exit(-1);
1215                                 /* NOTREACHED */
1216
1217                         default:
1218                                 fclose(out);
1219                                 if (pidXwait(child_id, NULL))
1220                                         done(1);
1221                                 break;
1222                         }
1223                 }
1224                 break;
1225         }
1226
1227         return OK;
1228 }
1229
1230
1231 /*
1232 ** Scan the content.
1233 **
1234 **    1) choose a transfer encoding.
1235 **    2) check for clashes with multipart boundary string.
1236 **    3) for text content, figure out which character set is being used.
1237 **
1238 ** If there is a clash with one of the contents and the multipart boundary,
1239 ** this function will exit with NOTOK.  This will cause the scanning process
1240 ** to be repeated with a different multipart boundary.  It is possible
1241 ** (although highly unlikely) that this scan will be repeated multiple times.
1242 */
1243
1244 static int
1245 scan_content(CT ct)
1246 {
1247         int len;
1248         int check8bit = 0, contains8bit = 0;  /* check if contains 8bit data */
1249         int checklinelen = 0, linelen = 0;  /* check for long lines */
1250         int checkboundary = 0, boundaryclash = 0; /* check if clashes with multipart boundary   */
1251         int checklinespace = 0, linespace = 0;  /* check if any line ends with space */
1252         unsigned char *cp = NULL, buffer[BUFSIZ];
1253         struct text *t = NULL;
1254         FILE *in = NULL;
1255         CE ce = ct->c_cefile;
1256
1257         /*
1258         ** handle multipart by scanning all subparts
1259         ** and then checking their encoding.
1260         */
1261         if (ct->c_type == CT_MULTIPART) {
1262                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1263                 struct part *part;
1264
1265                 /* initially mark the domain of enclosing multipart as 7bit */
1266                 ct->c_encoding = CE_7BIT;
1267
1268                 for (part = m->mp_parts; part; part = part->mp_next) {
1269                         CT p = part->mp_part;
1270
1271                         if (scan_content(p) == NOTOK) {
1272                                 /* choose encoding for subpart */
1273                                 return NOTOK;
1274                         }
1275
1276                         /*
1277                         ** if necessary, enlarge encoding for enclosing
1278                         ** multipart
1279                         */
1280                         if (p->c_encoding == CE_BINARY)
1281                                 ct->c_encoding = CE_BINARY;
1282                         if (p->c_encoding == CE_8BIT &&
1283                                         ct->c_encoding != CE_BINARY)
1284                                 ct->c_encoding = CE_8BIT;
1285                 }
1286
1287                 return OK;
1288         }
1289
1290         /*
1291         ** Decide what to check while scanning this content.
1292         */
1293         switch (ct->c_type) {
1294         case CT_TEXT:
1295                 check8bit = 1;
1296                 checkboundary = 1;
1297                 if (ct->c_subtype == TEXT_PLAIN) {
1298                         checklinelen = 0;
1299                         checklinespace = 0;
1300                 } else {
1301                         checklinelen = 1;
1302                         checklinespace = 1;
1303                 }
1304                 break;
1305
1306         case CT_APPLICATION:
1307                 check8bit = 1;
1308                 checklinelen = 1;
1309                 checklinespace = 1;
1310                 checkboundary = 1;
1311                 break;
1312
1313         case CT_MESSAGE:
1314                 check8bit = 0;
1315                 checklinelen = 0;
1316                 checklinespace = 0;
1317                 checkboundary = 1;
1318                 break;
1319
1320         case CT_AUDIO:
1321         case CT_IMAGE:
1322         case CT_VIDEO:
1323                 /*
1324                 ** Don't check anything for these types,
1325                 ** since we are forcing use of base64.
1326                 */
1327                 check8bit = 0;
1328                 checklinelen = 0;
1329                 checklinespace = 0;
1330                 checkboundary = 0;
1331                 break;
1332         }
1333
1334         /*
1335         ** Scan the unencoded content
1336         */
1337         if (check8bit || checklinelen || checklinespace || checkboundary) {
1338                 if ((in = fopen(ce->ce_file, "r")) == NULL)
1339                         adios(ce->ce_file, "unable to open for reading");
1340                 len = strlen(prefix);
1341
1342                 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1343                         /*
1344                         ** Check for 8bit data.
1345                         */
1346                         if (check8bit) {
1347                                 for (cp = buffer; *cp; cp++) {
1348                                         if (!isascii(*cp)) {
1349                                                 contains8bit = 1;
1350                                                 /* no need to keep checking */
1351                                                 check8bit = 0;
1352                                         }
1353                                 }
1354                         }
1355
1356                         /*
1357                         ** Check line length.
1358                         */
1359                         if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1360                                 linelen = 1;
1361                                 checklinelen = 0;  /* no need to keep checking */
1362                         }
1363
1364                         /*
1365                         ** Check if line ends with a space.
1366                         */
1367                         if (checklinespace &&
1368                                         (cp = buffer + strlen(buffer) - 2) >
1369                                         buffer && isspace(*cp)) {
1370                                 linespace = 1;
1371                                 /* no need to keep checking */
1372                                 checklinespace = 0;
1373                         }
1374
1375                         /*
1376                         ** Check if content contains a line that clashes
1377                         ** with our standard boundary for multipart messages.
1378                         */
1379                         if (checkboundary && buffer[0] == '-' &&
1380                                         buffer[1] == '-') {
1381                                 for (cp = buffer + strlen(buffer) - 1;
1382                                                 cp >= buffer; cp--)
1383                                         if (!isspace(*cp))
1384                                                 break;
1385                                 *++cp = '\0';
1386                                 if (strncmp(buffer + 2, prefix, len)==0 &&
1387                                                 isdigit(buffer[2 + len])) {
1388                                         boundaryclash = 1;
1389                                         /* no need to keep checking */
1390                                         checkboundary = 0;
1391                                 }
1392                         }
1393                 }
1394                 fclose(in);
1395         }
1396
1397         /*
1398         ** Decide which transfer encoding to use.
1399         */
1400         switch (ct->c_type) {
1401         case CT_TEXT:
1402                 /*
1403                 ** If the text content didn't specify a character
1404                 ** set, we need to figure out which one was used.
1405                 */
1406                 t = (struct text *) ct->c_ctparams;
1407                 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1408                         CI ci = &ct->c_ctinfo;
1409                         char **ap, **ep;
1410
1411                         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1412                                 continue;
1413
1414                         if (contains8bit) {
1415                                 t->tx_charset = CHARSET_UNKNOWN;
1416                                 *ap = concat("charset=", write_charset_8bit(),
1417                                                 NULL);
1418                         } else {
1419                                 t->tx_charset = CHARSET_USASCII;
1420                                 *ap = getcpy("charset=us-ascii");
1421                         }
1422
1423                         cp = strchr(*ap++, '=');
1424                         *ap = NULL;
1425                         *cp++ = '\0';
1426                         *ep = cp;
1427                 }
1428
1429                 if (contains8bit || linelen || linespace)
1430                         ct->c_encoding = CE_QUOTED;
1431                 else
1432                         ct->c_encoding = CE_7BIT;
1433                 break;
1434
1435         case CT_APPLICATION:
1436                 /* For application type, use base64, except when postscript */
1437                 if (contains8bit || linelen || linespace)
1438                         ct->c_encoding = (ct->c_subtype ==
1439                                         APPLICATION_POSTSCRIPT) ?
1440                                         CE_QUOTED : CE_BASE64;
1441                 else
1442                         ct->c_encoding = CE_7BIT;
1443                 break;
1444
1445         case CT_MESSAGE:
1446                 ct->c_encoding = CE_7BIT;
1447                 break;
1448
1449         case CT_AUDIO:
1450         case CT_IMAGE:
1451         case CT_VIDEO:
1452                 /* For audio, image, and video contents, just use base64 */
1453                 ct->c_encoding = CE_BASE64;
1454                 break;
1455         }
1456
1457         return (boundaryclash ? NOTOK : OK);
1458 }
1459
1460
1461 /*
1462 ** Scan the content structures, and build header
1463 ** fields that will need to be output into the
1464 ** message.
1465 */
1466
1467 static int
1468 build_headers(CT ct)
1469 {
1470         int cc, len;
1471         char **ap, **ep;
1472         char *np, *vp, buffer[BUFSIZ];
1473         CI ci = &ct->c_ctinfo;
1474
1475         /*
1476         ** If message is type multipart, then add the multipart
1477         ** boundary to the list of attribute/value pairs.
1478         */
1479         if (ct->c_type == CT_MULTIPART) {
1480                 char *cp;
1481                 static int level = 0;  /* store nesting level */
1482
1483                 ap = ci->ci_attrs;
1484                 ep = ci->ci_values;
1485                 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1486                                 prefix, level++);
1487                 cp = strchr(*ap++ = getcpy(buffer), '=');
1488                 *ap = NULL;
1489                 *cp++ = '\0';
1490                 *ep = cp;
1491         }
1492
1493         /*
1494         ** output the content type and subtype
1495         */
1496         np = getcpy(TYPE_FIELD);
1497         vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1498
1499         /* keep track of length of line */
1500         len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1501                         strlen(ci->ci_subtype) + 3;
1502
1503         /*
1504         ** Append the attribute/value pairs to
1505         ** the end of the Content-Type line.
1506         */
1507         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1508                 vp = add(";", vp);
1509                 len++;
1510
1511                 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1512                 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1513                         vp = add("\n\t", vp);
1514                         len = 8;
1515                 } else {
1516                         vp = add(" ", vp);
1517                         len++;
1518                 }
1519                 vp = add(buffer, vp);
1520                 len += cc;
1521         }
1522
1523         /*
1524         ** Append any RFC-822 comment to the end of
1525         ** the Content-Type line.
1526         */
1527         if (ci->ci_comment) {
1528                 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1529                 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1530                         vp = add("\n\t", vp);
1531                         len = 8;
1532                 } else {
1533                         vp = add(" ", vp);
1534                         len++;
1535                 }
1536                 vp = add(buffer, vp);
1537                 len += cc;
1538         }
1539         vp = add("\n", vp);
1540         add_header(ct, np, vp);
1541
1542         /*
1543         ** output the Content-ID
1544         */
1545         if (ct->c_id) {
1546                 np = getcpy(ID_FIELD);
1547                 vp = concat(" ", ct->c_id, NULL);
1548                 add_header(ct, np, vp);
1549         }
1550
1551         /*
1552         ** output the Content-Description
1553         */
1554         if (ct->c_descr) {
1555                 np = getcpy(DESCR_FIELD);
1556                 vp = concat(" ", ct->c_descr, NULL);
1557                 add_header(ct, np, vp);
1558         }
1559
1560         /*
1561         ** output the Content-Disposition
1562         */
1563         if (ct->c_dispo) {
1564                 np = getcpy(DISPO_FIELD);
1565                 vp = concat(" ", ct->c_dispo, NULL);
1566                 add_header(ct, np, vp);
1567         }
1568
1569         /*
1570         ** output the Content-Transfer-Encoding
1571         */
1572         switch (ct->c_encoding) {
1573         case CE_7BIT:
1574                 /* Nothing to output */
1575                 break;
1576
1577         case CE_8BIT:
1578                 if (ct->c_type == CT_MESSAGE)
1579                         adios(NULL, "internal error, invalid encoding");
1580
1581                 np = getcpy(ENCODING_FIELD);
1582                 vp = concat(" ", "8bit", "\n", NULL);
1583                 add_header(ct, np, vp);
1584                 break;
1585
1586         case CE_QUOTED:
1587                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1588                         adios(NULL, "internal error, invalid encoding");
1589
1590                 np = getcpy(ENCODING_FIELD);
1591                 vp = concat(" ", "quoted-printable", "\n", NULL);
1592                 add_header(ct, np, vp);
1593                 break;
1594
1595         case CE_BASE64:
1596                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1597                         adios(NULL, "internal error, invalid encoding");
1598
1599                 np = getcpy(ENCODING_FIELD);
1600                 vp = concat(" ", "base64", "\n", NULL);
1601                 add_header(ct, np, vp);
1602                 break;
1603
1604         case CE_BINARY:
1605                 if (ct->c_type == CT_MESSAGE)
1606                         adios(NULL, "internal error, invalid encoding");
1607
1608                 np = getcpy(ENCODING_FIELD);
1609                 vp = concat(" ", "binary", "\n", NULL);
1610                 add_header(ct, np, vp);
1611                 break;
1612
1613         default:
1614                 adios(NULL, "unknown transfer encoding in content");
1615                 break;
1616         }
1617
1618         /*
1619         ** Additional content specific header processing
1620         */
1621         switch (ct->c_type) {
1622         case CT_MULTIPART:
1623         {
1624                 struct multipart *m;
1625                 struct part *part;
1626
1627                 m = (struct multipart *) ct->c_ctparams;
1628                 for (part = m->mp_parts; part; part = part->mp_next) {
1629                         CT p;
1630
1631                         p = part->mp_part;
1632                         build_headers(p);
1633                 }
1634         }
1635                 break;
1636
1637         default:
1638                 /* Nothing to do */
1639                 break;
1640         }
1641
1642         return OK;
1643 }