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", 2 },
  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 void unlink_done();
  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;
 115         FILE *fp = NULL;
 116         FILE *fp_out = NULL;
 117
 118         if (atexit(unlink_done) != 0) {
 119                 adios(NULL, "atexit failed");
 120         }
 121
 122         setlocale(LC_ALL, "");
 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                                 /* sysexits.h EX_USAGE */
 145                                 exit(1);
 146                         case UNKWNSW:
 147                                 adios(NULL, "-%s unknown", cp);
 148
 149                         case HELPSW:
 150                                 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
 151                                 print_help(buf, switches, 1);
 152                                 exit(0);
 153                         case VERSIONSW:
 154                                 print_version(invo_name);
 155                                 exit(0);
 156
 157                         case VERBSW:
 158                                 verbosw++;
 159                                 continue;
 160                         case NVERBSW:
 161                                 verbosw = 0;
 162                                 continue;
 163                         case DEBUGSW:
 164                                 debugsw = 1;
 165                                 continue;
 166                         }
 167                 }
 168                 if (compfile)
 169                         adios(NULL, "only one composition file allowed");
 170                 else
 171                         compfile = cp;
 172         }
 173
 174         set_endian();
 175
 176         /*
 177         ** Check if we've specified an additional profile
 178         */
 179         if ((cp = getenv("MHBUILD"))) {
 180                 if ((fp = fopen(cp, "r"))) {
 181                         readconfig((struct node **) 0, fp, cp, 0);
 182                         fclose(fp);
 183                 } else {
 184                         admonish("", "unable to read $MHBUILD profile (%s)",
 185                                         cp);
 186                 }
 187         }
 188
 189         /*
 190         ** Read the standard profile setup
 191         */
 192         if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
 193                 readconfig((struct node **) 0, fp, cp, 0);
 194                 fclose(fp);
 195         }
 196
 197         /*
 198         ** Check for storage directory.  If defined, we
 199         ** will store temporary files there.  Else we
 200         ** store them in standard nmh directory.
 201         */
 202         if ((cp = context_find(nmhstorage)) && *cp)
 203                 tmp = concat(cp, "/", invo_name, NULL);
 204         else
 205                 tmp = getcpy(toabsdir(invo_name));
 206
 207         /* Check if we have a file to process */
 208         if (!compfile)
 209                 adios(NULL, "need to specify a %s composition file",
 210                                 invo_name);
 211
 212         /*
 213         ** Process the composition file from standard input.
 214         */
 215         if (compfile[0] == '-' && compfile[1] == '\0') {
 216                 /* copy standard input to temporary file */
 217                 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
 218                                 sizeof(infile));
 219                 while (fgets(buffer, BUFSIZ, stdin))
 220                         fputs(buffer, fp);
 221                 fclose(fp);
 222                 unlink_infile = 1;
 223
 224                 /* build the content structures for MIME message */
 225                 ct = build_mime(infile);
 226
 227                 /* output MIME message to this temporary file */
 228                 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
 229                                 sizeof(outfile));
 230                 unlink_outfile = 1;
 231
 232                 /* output the message */
 233                 output_message_fp(ct, fp_out, outfile);
 234                 fclose(fp_out);
 235
 236                 /* output the temp file to standard output */
 237                 if ((fp = fopen(outfile, "r")) == NULL)
 238                         adios(outfile, "unable to open");
 239                 while (fgets(buffer, BUFSIZ, fp))
 240                         fputs(buffer, stdout);
 241                 fclose(fp);
 242
 243                 unlink(infile);
 244                 unlink_infile = 0;
 245
 246                 unlink(outfile);
 247                 unlink_outfile = 0;
 248
 249                 free_content(ct);
 250                 exit(0);
 251         }
 252
 253         /*
 254         ** Process the composition file from a file.
 255         */
 256
 257         /* build the content structures for MIME message */
 258         ct = build_mime(compfile);
 259
 260         /* output MIME message to this temporary file */
 261         strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
 262                         sizeof(outfile));
 263         unlink_outfile = 1;
 264
 265         /* output the message */
 266         output_message_fp(ct, fp_out, outfile);
 267         fclose(fp_out);
 268
 269         /* Rename composition draft */
 270         snprintf(buffer, sizeof(buffer), "%s.orig", compfile);
 271         if (rename(compfile, buffer) == NOTOK) {
 272                 adios(buffer, "unable to rename draft %s to", compfile);
 273         }
 274
 275         /* Rename output file to take its place */
 276         if (rename(outfile, compfile) == NOTOK) {
 277                 advise(compfile, "unable to rename output %s to", outfile);
 278                 rename(buffer, compfile);
 279                 /* sysexits.h EX_IOERR */
 280                 exit(1);
 281         }
 282         unlink_outfile = 0;
 283
 284         free_content(ct);
 285         return 0;
 286 }
 287
 288
 289 void
 290 unlink_done()
 291 {
 292         /*
 293         ** Check if we need to remove stray temporary files.
 294         */
 295         if (unlink_infile) {
 296                 unlink(infile);
 297         }
 298         if (unlink_outfile) {
 299                 unlink(outfile);
 300         }
 301 }
 302
 303 /*
 304 ** Main routine for translating composition file
 305 ** into valid MIME message.  It translates the draft
 306 ** into a content structure (actually a tree of content
 307 ** structures).  This message then can be manipulated
 308 ** in various ways, including being output via
 309 ** output_message().
 310 */
 311 static CT
 312 build_mime(char *infile)
 313 {
 314         int compnum, state;
 315         char buf[BUFSIZ], name[NAMESZ];
 316         char *cp, *np, *vp;
 317         struct multipart *m;
 318         struct part **pp;
 319         CT ct;
 320         FILE *in;
 321
 322         umask(~m_gmprot());
 323
 324         /* open the composition draft */
 325         if ((in = fopen(infile, "r")) == NULL)
 326                 adios(infile, "unable to open for reading");
 327
 328         /*
 329         ** Allocate space for primary (outside) content
 330         */
 331         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 332                 adios(NULL, "out of memory");
 333
 334         /*
 335         ** Allocate structure for handling decoded content
 336         ** for this part.  We don't really need this, but
 337         ** allocate it to remain consistent.
 338         */
 339         init_decoded_content(ct);
 340
 341         /*
 342         ** Parse some of the header fields in the composition
 343         ** draft into the linked list of header fields for
 344         ** the new MIME message.
 345         */
 346         for (compnum = 1, state = FLD;;) {
 347                 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
 348                 case FLD:
 349                 case FLDPLUS:
 350                 case FLDEOF:
 351                         compnum++;
 352
 353                         /* abort if draft has Mime-Version header field */
 354                         if (!mh_strcasecmp(name, VRSN_FIELD))
 355                                 adios(NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
 356
 357                         /*
 358                         ** abort if draft has Content-Transfer-Encoding
 359                         ** header field
 360                         */
 361                         if (!mh_strcasecmp(name, ENCODING_FIELD))
 362                                 adios(NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
 363
 364                         /* ignore any Content-Type fields in the header */
 365                         if (!mh_strcasecmp(name, TYPE_FIELD)) {
 366                                 while (state == FLDPLUS)
 367                                         state = m_getfld(state, name, buf,
 368                                                         sizeof(buf), in);
 369                                 goto finish_field;
 370                         }
 371
 372                         /* get copies of the buffers */
 373                         np = getcpy(name);
 374                         vp = getcpy(buf);
 375
 376                         /* if necessary, get rest of field */
 377                         while (state == FLDPLUS) {
 378                                 state = m_getfld(state, name, buf,
 379                                                 sizeof(buf), in);
 380                                 vp = add(buf, vp);  /* add to prev value */
 381                         }
 382
 383                         /* Now add the header data to the list */
 384                         add_header(ct, np, vp);
 385
 386 finish_field:
 387                         /* if this wasn't the last hdr field, then continue */
 388                         if (state != FLDEOF)
 389                                 continue;
 390                         /* else fall... */
 391
 392                 case FILEEOF:
 393                         adios(NULL, "draft has empty body -- no directives!");
 394                         /* NOTREACHED */
 395
 396                 case BODY:
 397                 case BODYEOF:
 398                         fseek(in, (long) (-strlen(buf)), SEEK_CUR);
 399                         break;
 400
 401                 case LENERR:
 402                 case FMTERR:
 403                         adios(NULL, "message format error in component #%d",
 404                                         compnum);
 405
 406                 default:
 407                         adios(NULL, "getfld() returned %d", state);
 408                 }
 409                 break;
 410         }
 411
 412         /*
 413         ** Now add the MIME-Version header field
 414         ** to the list of header fields.
 415         */
 416         np = getcpy(VRSN_FIELD);
 417         vp = concat(" ", VRSN_VALUE, "\n", NULL);
 418         add_header(ct, np, vp);
 419
 420         /*
 421         ** We initally assume we will find multiple contents in the
 422         ** draft.  So create a multipart/mixed content to hold everything.
 423         ** We can remove this later, if it is not needed.
 424         */
 425         if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK) {
 426                 /* sysexits.h EX_DATAERR */
 427                 exit(1);
 428         }
 429         ct->c_type = CT_MULTIPART;
 430         ct->c_subtype = MULTI_MIXED;
 431         ct->c_file = getcpy(infile);
 432
 433         if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
 434                 adios(NULL, "out of memory");
 435         ct->c_ctparams = (void *) m;
 436         pp = &m->mp_parts;
 437
 438         /*
 439         ** read and parse the composition file
 440         ** and the directives it contains.
 441         */
 442         while (fgetstr(buf, sizeof(buf) - 1, in)) {
 443                 struct part *part;
 444                 CT p;
 445
 446                 if (user_content(in, infile, buf, &p) == DONE) {
 447                         admonish(NULL, "ignoring spurious #end");
 448                         continue;
 449                 }
 450                 if (!p)
 451                         continue;
 452
 453                 if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 454                         adios(NULL, "out of memory");
 455                 *pp = part;
 456                 pp = &part->mp_next;
 457                 part->mp_part = p;
 458         }
 459
 460         /*
 461         ** close the composition draft since
 462         ** it's not needed any longer.
 463         */
 464         fclose(in);
 465
 466         /* check if any contents were found */
 467         if (!m->mp_parts)
 468                 adios(NULL, "no content directives found");
 469
 470         /*
 471         ** If only one content was found, then remove and
 472         ** free the outer multipart content.
 473         */
 474         if (!m->mp_parts->mp_next) {
 475                 CT p;
 476
 477                 p = m->mp_parts->mp_part;
 478                 m->mp_parts->mp_part = NULL;
 479
 480                 /* move header fields */
 481                 p->c_first_hf = ct->c_first_hf;
 482                 p->c_last_hf = ct->c_last_hf;
 483                 ct->c_first_hf = NULL;
 484                 ct->c_last_hf = NULL;
 485
 486                 free_content(ct);
 487                 ct = p;
 488         } else {
 489                 set_id(ct, 1);
 490         }
 491
 492         /*
 493         ** Fill out, or expand directives.  Parse and execute
 494         ** commands specified by profile composition strings.
 495         */
 496         compose_content(ct);
 497
 498         if ((cp = strchr(prefix, 'a')) == NULL)
 499                 adios(NULL, "internal error(4)");
 500
 501         /*
 502         ** Scan the contents.  Choose a transfer encoding, and
 503         ** check if prefix for multipart boundary clashes with
 504         ** any of the contents.
 505         */
 506         while (scan_content(ct) == NOTOK) {
 507                 if (*cp < 'z') {
 508                         (*cp)++;
 509                 } else {
 510                         if (*++cp == 0)
 511                                 adios(NULL, "giving up trying to find a unique delimiter string");
 512                                 else
 513                                 (*cp)++;
 514                 }
 515         }
 516
 517         /* Build the rest of the header field structures */
 518         build_headers(ct);
 519
 520         return ct;
 521 }
 522
 523
 524 /*
 525 ** Set up structures for placing unencoded
 526 ** content when building parts.
 527 */
 528
 529 static int
 530 init_decoded_content(CT ct)
 531 {
 532         CE ce;
 533
 534         if ((ce = (CE) calloc(1, sizeof(*ce))) == NULL)
 535                 adios(NULL, "out of memory");
 536
 537         ct->c_cefile     = ce;
 538         ct->c_ceopenfnx  = open7Bit;  /* since unencoded */
 539         ct->c_ceclosefnx = close_encoding;
 540         ct->c_cesizefnx  = NULL;  /* since unencoded */
 541
 542         return OK;
 543 }
 544
 545
 546 static char *
 547 fgetstr(char *s, int n, FILE *stream)
 548 {
 549         char *cp, *ep;
 550
 551         for (ep = (cp = s) + n; cp < ep; ) {
 552                 int i;
 553
 554                 if (!fgets(cp, n, stream))
 555                         return (cp != s ? s : NULL);
 556                 if (cp == s && *cp != '#')
 557                         return s;
 558
 559                 cp += (i = strlen(cp)) - 1;
 560                 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
 561                         break;
 562                 *cp = '\0';
 563                 n -= (i - 2);
 564         }
 565
 566         return s;
 567 }
 568
 569
 570 /*
 571 ** Parse the composition draft for text and directives.
 572 ** Do initial setup of Content structure.
 573 */
 574
 575 static int
 576 user_content(FILE *in, char *file, char *buf, CT *ctp)
 577 {
 578         int vrsn;
 579         unsigned char *cp;
 580         char **ap;
 581         char buffer[BUFSIZ];
 582         struct multipart *m;
 583         struct part **pp;
 584         struct str2init *s2i;
 585         CI ci;
 586         CT ct;
 587         CE ce;
 588
 589         if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
 590                 *ctp = NULL;
 591                 return OK;
 592         }
 593
 594         /* allocate basic Content structure */
 595         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 596                 adios(NULL, "out of memory");
 597         *ctp = ct;
 598
 599         /* allocate basic structure for handling decoded content */
 600         init_decoded_content(ct);
 601         ce = ct->c_cefile;
 602
 603         ci = &ct->c_ctinfo;
 604         set_id(ct, 0);
 605
 606         /*
 607         ** Handle inline text.  Check if line
 608         ** is one of the following forms:
 609         **
 610         ** 1) doesn't begin with '#'  (implicit directive)
 611         ** 2) begins with "##"        (implicit directive)
 612         ** 3) begins with "#<"
 613         */
 614         if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
 615                 int headers;
 616                 int inlineD;
 617                 long pos;
 618                 char content[BUFSIZ];
 619                 FILE *out;
 620                 char *cp;
 621
 622                 cp = m_mktemp2(NULL, invo_name, NULL, &out);
 623                 if (cp == NULL)
 624                         adios("mhbuild", "unable to create temporary file");
 625
 626                 /* use a temp file to collect the plain text lines */
 627                 ce->ce_file = getcpy(cp);
 628                 ce->ce_unlink = 1;
 629
 630                 if (buf[0] == '#' && buf[1] == '<') {
 631                         strncpy(content, buf + 2, sizeof(content));
 632                         inlineD = 1;
 633                         goto rock_and_roll;
 634                 } else {
 635                         inlineD = 0;
 636                 }
 637
 638                 /* the directive is implicit */
 639                 strncpy(content, "text/plain", sizeof(content));
 640                 headers = 0;
 641                 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
 642                 for (;;) {
 643                         int i;
 644
 645                         if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
 646                                         buffer[i=strlen(DESCR_FIELD)] == ':') {
 647                                 headers = 1;
 648
 649 again_descr:
 650                                 ct->c_descr = add(buffer + i + 1, ct->c_descr);
 651                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 652                                         adios(NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
 653                                 switch (buffer[0]) {
 654                                 case ' ':
 655                                 case '\t':
 656                                         i = -1;
 657                                         goto again_descr;
 658
 659                                 case '#':
 660                                         adios(NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
 661                                         /* NOTREACHED */
 662
 663                                 default:
 664                                         break;
 665                                 }
 666                         }
 667
 668                         if (headers >= 0 && uprf(buffer, DISPO_FIELD)
 669                                 && buffer[i = strlen(DISPO_FIELD)] == ':') {
 670                                 headers = 1;
 671
 672 again_dispo:
 673                                 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
 674                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 675                                         adios(NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
 676                                 switch (buffer[0]) {
 677                                 case ' ':
 678                                 case '\t':
 679                                         i = -1;
 680                                         goto again_dispo;
 681
 682                                 case '#':
 683                                         adios(NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
 684                                         /* NOTREACHED */
 685
 686                                 default:
 687                                         break;
 688                                 }
 689                         }
 690
 691                         if (headers != 1 || buffer[0] != '\n')
 692                                 fputs(buffer, out);
 693
 694 rock_and_roll:
 695                         headers = -1;
 696                         pos = ftell(in);
 697                         if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
 698                                         == NULL)
 699                                 break;
 700                         if (buffer[0] == '#') {
 701                                 char *bp;
 702
 703                                 if (buffer[1] != '#')
 704                                         break;
 705                                 for (cp = (bp = buffer) + 1; *cp; cp++)
 706                                         *bp++ = *cp;
 707                                 *bp = '\0';
 708                         }
 709                 }
 710
 711                 fclose(out);
 712
 713                 /* parse content type */
 714                 if (get_ctinfo(content, ct, inlineD) == NOTOK)
 715                         /* sysexits.h EX_USAGE */
 716                         exit(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                 /* sysexits.h EX_DATAERR */
 765                 exit(1);
 766
 767         /* check directive against the list of MIME types */
 768         for (s2i = str2cts; s2i->si_key; s2i++)
 769                 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 770                         break;
 771
 772         /*
 773         ** Check if the directive specified a valid type.
 774         ** This will happen if it was one of the following forms:
 775         **
 776         **    #type/subtype
 777         */
 778         if (s2i->si_key) {
 779                 if (!ci->ci_subtype)
 780                         adios(NULL, "missing subtype in \"#%s\"", ci->ci_type);
 781
 782                 switch (ct->c_type = s2i->si_val) {
 783                 case CT_MULTIPART:
 784                         adios(NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 785                         /* NOTREACHED */
 786
 787                 case CT_MESSAGE:
 788                         if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
 789                                         !mh_strcasecmp(ci->ci_subtype,
 790                                         "external-body")) {
 791                                 adios(NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
 792                         }
 793 use_forw:
 794                         admonish(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 795                         /* FALL */
 796
 797                 default:
 798                         if ((ct->c_ctinitfnx = s2i->si_init))
 799                                 (*ct->c_ctinitfnx) (ct);
 800                         break;
 801                 }
 802
 803                 /* Handle [file] argument */
 804                 if (ci->ci_magic) {
 805                         /* check if specifies command to execute */
 806                         if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
 807                                 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
 808                                         continue;
 809                                 if (!*cp)
 810                                         adios(NULL, "empty pipe command for #%s directive", ci->ci_type);
 811                                 cp = getcpy(cp);
 812                                 free(ci->ci_magic);
 813                                 ci->ci_magic = cp;
 814                         } else {
 815                                 /* record filename of decoded contents */
 816                                 ce->ce_file = ci->ci_magic;
 817                                 if (access(ce->ce_file, R_OK) == NOTOK)
 818                                         adios("reading", "unable to access %s for", ce->ce_file);
 819                                 ci->ci_magic = NULL;
 820                         }
 821                         return OK;
 822                 }
 823
 824                 /*
 825                 ** No [file] argument, so check profile for
 826                 ** method to compose content.
 827                 */
 828                 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
 829                                 invo_name, ci->ci_type, ci->ci_subtype);
 830                 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
 831                         snprintf(buffer, sizeof(buffer), "%s-compose-%s",
 832                                         invo_name, ci->ci_type);
 833                         if ((cp = context_find(buffer)) == NULL ||
 834                                         *cp == '\0') {
 835                                 content_error(NULL, ct, "don't know how to compose content");
 836                                 /* sysexits.h EX_USAGE */
 837                                 exit(1);
 838                         }
 839                 }
 840                 ci->ci_magic = getcpy(cp);
 841                 return OK;
 842         }
 843
 844         /*
 845         ** Message directive
 846         ** #forw [+folder] [msgs]
 847         */
 848         if (!mh_strcasecmp(ci->ci_type, "forw")) {
 849                 int msgnum;
 850                 char *folder, *arguments[MAXARGS];
 851                 struct msgs *mp;
 852
 853                 if (ci->ci_magic) {
 854                         int i;
 855
 856                         ap = brkstring(ci->ci_magic, " ", "\n");
 857                         for (i=0; ap[i] && i<MAXARGS-1; i++) {
 858                                 arguments[i] = ap[i];
 859                         }
 860                         arguments[i] = NULL;
 861
 862                 } else {
 863                         arguments[0] = seq_cur;
 864                         arguments[1] = NULL;
 865                 }
 866                 folder = NULL;
 867
 868                 /* search the arguments for a folder name */
 869                 for (ap = arguments; *ap; ap++) {
 870                         cp = *ap;
 871                         if (*cp == '+' || *cp == '@') {
 872                                 if (folder)
 873                                         adios(NULL, "only one folder per #forw directive");
 874                                 else
 875                                         folder = getcpy(expandfol(cp));
 876                         }
 877                 }
 878
 879                 /* else, use the current folder */
 880                 if (!folder)
 881                         folder = getcpy(getcurfol());
 882
 883                 if (!(mp = folder_read(folder)))
 884                         adios(NULL, "unable to read folder %s", folder);
 885                 for (ap = arguments; *ap; ap++) {
 886                         cp = *ap;
 887                         if (*cp != '+' && *cp != '@')
 888                                 if (!m_convert(mp, cp))
 889                                         /* sysexits.h EX_USAGE */
 890                                         exit(1);
 891                 }
 892                 free(folder);
 893                 free_ctinfo(ct);
 894
 895                 /*
 896                 ** If there is more than one message to include, make this
 897                 ** a content of type "multipart/digest" and insert each message
 898                 ** as a subpart.  If there is only one message, then make this
 899                 ** a content of type "message/rfc822".
 900                 */
 901                 if (mp->numsel > 1) {
 902                         /* we are forwarding multiple messages */
 903                         if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
 904                                 /* sysexits.h EX_DATAERR */
 905                                 exit(1);
 906                         ct->c_type = CT_MULTIPART;
 907                         ct->c_subtype = MULTI_DIGEST;
 908
 909                         if ((m = (struct multipart *)
 910                                         calloc(1, sizeof(*m))) == NULL)
 911                                 adios(NULL, "out of memory");
 912                         ct->c_ctparams = (void *) m;
 913                         pp = &m->mp_parts;
 914
 915                         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 916                                 if (is_selected(mp, msgnum)) {
 917                                         struct part *part;
 918                                         CT p;
 919                                         CE pe;
 920
 921                                         if ((p = (CT) calloc(1, sizeof(*p)))
 922                                                         == NULL)
 923                                                 adios(NULL, "out of memory");
 924                                         init_decoded_content(p);
 925                                         pe = p->c_cefile;
 926                                         if (get_ctinfo("message/rfc822", p, 0)
 927                                                         == NOTOK)
 928                                                 /* sysexits.h EX_DATAERR */
 929                                                 exit(1);
 930                                         p->c_type = CT_MESSAGE;
 931                                         p->c_subtype = MESSAGE_RFC822;
 932
 933                                         snprintf(buffer, sizeof(buffer),
 934                                                         "%s/%d", mp->foldpath,
 935                                                         msgnum);
 936                                         pe->ce_file = getcpy(buffer);
 937
 938                                         if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 939                                                 adios(NULL, "out of memory");
 940                                         *pp = part;
 941                                         pp = &part->mp_next;
 942                                         part->mp_part = p;
 943                                 }
 944                         }
 945                 } else {
 946                         /* we are forwarding one message */
 947                         if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
 948                                 /* sysexits.h EX_DATAERR */
 949                                 exit(1);
 950                         ct->c_type = CT_MESSAGE;
 951                         ct->c_subtype = MESSAGE_RFC822;
 952
 953                         msgnum = mp->lowsel;
 954                         snprintf(buffer, sizeof(buffer), "%s/%d",
 955                                         mp->foldpath, msgnum);
 956                         ce->ce_file = getcpy(buffer);
 957                 }
 958
 959                 folder_free(mp);  /* free folder/message structure */
 960                 return OK;
 961         }
 962
 963         /*
 964         ** #end
 965         */
 966         if (!mh_strcasecmp(ci->ci_type, "end")) {
 967                 free_content(ct);
 968                 *ctp = NULL;
 969                 return DONE;
 970         }
 971
 972         /*
 973         ** #begin [ alternative | parallel ]
 974         */
 975         if (!mh_strcasecmp(ci->ci_type, "begin")) {
 976                 if (!ci->ci_magic) {
 977                         vrsn = MULTI_MIXED;
 978                         cp = SubMultiPart[vrsn - 1].kv_key;
 979                 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
 980                         vrsn = MULTI_ALTERNATE;
 981                         cp = SubMultiPart[vrsn - 1].kv_key;
 982                 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
 983                         vrsn = MULTI_PARALLEL;
 984                         cp = SubMultiPart[vrsn - 1].kv_key;
 985                 } else if (uprf(ci->ci_magic, "digest")) {
 986                         goto use_forw;
 987                 } else {
 988                         vrsn = MULTI_UNKNOWN;
 989                         cp = ci->ci_magic;
 990                 }
 991
 992                 free_ctinfo(ct);
 993                 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
 994                 if (get_ctinfo(buffer, ct, 0) == NOTOK)
 995                         /* sysexits.h EX_DATAERR */
 996                         exit(1);
 997                 ct->c_type = CT_MULTIPART;
 998                 ct->c_subtype = vrsn;
 999
1000                 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
1001                         adios(NULL, "out of memory");
1002                 ct->c_ctparams = (void *) m;
1003
1004                 pp = &m->mp_parts;
1005                 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
1006                         struct part *part;
1007                         CT p;
1008
1009                         if (user_content(in, file, buffer, &p) == DONE) {
1010                                 if (!m->mp_parts)
1011                                         adios(NULL, "empty \"#begin ... #end\" sequence");
1012                                 return OK;
1013                         }
1014                         if (!p)
1015                                 continue;
1016
1017                         if ((part = (struct part *)
1018                                         calloc(1, sizeof(*part))) == NULL)
1019                                 adios(NULL, "out of memory");
1020                         *pp = part;
1021                         pp = &part->mp_next;
1022                         part->mp_part = p;
1023                 }
1024                 admonish(NULL, "premature end-of-file, missing #end");
1025                 return OK;
1026         }
1027
1028         /*
1029         ** Unknown directive
1030         */
1031         adios(NULL, "unknown directive \"#%s\"", ci->ci_type);
1032         return NOTOK;  /* NOT REACHED */
1033 }
1034
1035
1036 static void
1037 set_id(CT ct, int top)
1038 {
1039         char msgid[BUFSIZ];
1040         static int partno;
1041         static time_t clock = 0;
1042         static char *msgfmt;
1043
1044         if (clock == 0) {
1045                 time(&clock);
1046                 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1047                                 (int) getpid(), (long) clock, LocalName());
1048                 partno = 0;
1049                 msgfmt = getcpy(msgid);
1050         }
1051         snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1052         ct->c_id = getcpy(msgid);
1053 }
1054
1055
1056 /*
1057 ** Fill out, or expand the various contents in the composition
1058 ** draft.  Read-in any necessary files.  Parse and execute any
1059 ** commands specified by profile composition strings.
1060 */
1061
1062 static int
1063 compose_content(CT ct)
1064 {
1065         CE ce = ct->c_cefile;
1066
1067         switch (ct->c_type) {
1068         case CT_MULTIPART:
1069         {
1070                 int partnum;
1071                 char *pp;
1072                 char partnam[BUFSIZ];
1073                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1074                 struct part *part;
1075
1076                 if (ct->c_partno) {
1077                         snprintf(partnam, sizeof(partnam), "%s.",
1078                                         ct->c_partno);
1079                         pp = partnam + strlen(partnam);
1080                 } else {
1081                         pp = partnam;
1082                 }
1083
1084                 /* first, we call compose_content on all the subparts */
1085                 for (part = m->mp_parts, partnum = 1; part;
1086                                 part = part->mp_next, partnum++) {
1087                         CT p = part->mp_part;
1088
1089                         sprintf(pp, "%d", partnum);
1090                         p->c_partno = getcpy(partnam);
1091                         if (compose_content(p) == NOTOK)
1092                                 return NOTOK;
1093                 }
1094         }
1095         break;
1096
1097         case CT_MESSAGE:
1098                 /* Nothing to do for type message */
1099                 break;
1100
1101         /*
1102         ** Discrete types (text/application/audio/image/video)
1103         */
1104         default:
1105                 if (!ce->ce_file) {
1106                         pid_t child_id;
1107                         int xstdout, len, buflen;
1108                         char *bp, **ap, *cp;
1109                         char *vec[4], buffer[BUFSIZ];
1110                         FILE *out;
1111                         CI ci = &ct->c_ctinfo;
1112                         char *tfile = NULL;
1113
1114                         if (!(cp = ci->ci_magic))
1115                                 adios(NULL, "internal error(5)");
1116
1117                         tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1118                         if (tfile == NULL) {
1119                                 adios("mhbuild", "unable to create temporary file");
1120                         }
1121                         ce->ce_file = getcpy(tfile);
1122                         ce->ce_unlink = 1;
1123
1124                         xstdout = 0;
1125
1126                         /* Get buffer ready to go */
1127                         bp = buffer;
1128                         bp[0] = '\0';
1129                         buflen = sizeof(buffer);
1130
1131                         /*
1132                         ** Parse composition string into buffer
1133                         */
1134                         for ( ; *cp; cp++) {
1135                                 if (*cp == '%') {
1136                                         switch (*++cp) {
1137                                         case 'a':
1138                                         {
1139                                                 /*
1140                                                 ** insert parameters from
1141                                                 ** directive
1142                                                 */
1143                                                 char **ep;
1144                                                 char *s = "";
1145
1146                                                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1147                                                         snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1148                                                         len = strlen(bp);
1149                                                         bp += len;
1150                                                         buflen -= len;
1151                                                         s = " ";
1152                                                 }
1153                                         }
1154                                         break;
1155
1156                                         case 'F':
1157                                                 /* %f, and stdout is not-redirected */
1158                                                 xstdout = 1;
1159                                                 /* and fall... */
1160
1161                                         case 'f':
1162                                                 /*
1163                                                 ** insert temporary filename
1164                                                 ** where content should be
1165                                                 ** written
1166                                                 */
1167                                                 snprintf(bp, buflen, "%s", ce->ce_file);
1168                                                 break;
1169
1170                                         case 's':
1171                                                 /* insert content subtype */
1172                                                 strncpy(bp, ci->ci_subtype, buflen);
1173                                                 break;
1174
1175                                         case '%':
1176                                                 /* insert character % */
1177                                                 goto raw;
1178
1179                                         default:
1180                                                 *bp++ = *--cp;
1181                                                 *bp = '\0';
1182                                                 buflen--;
1183                                                 continue;
1184                                         }
1185                                         len = strlen(bp);
1186                                         bp += len;
1187                                         buflen -= len;
1188                                 } else {
1189 raw:
1190                                         *bp++ = *cp;
1191                                         *bp = '\0';
1192                                         buflen--;
1193                                 }
1194                         }
1195
1196                         if (verbosw)
1197                                 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1198
1199                         fflush(stdout);  /* not sure if need for -noverbose */
1200
1201                         vec[0] = "/bin/sh";
1202                         vec[1] = "-c";
1203                         vec[2] = buffer;
1204                         vec[3] = NULL;
1205
1206                         if ((out = fopen(ce->ce_file, "w")) == NULL)
1207                                 adios(ce->ce_file, "unable to open for writing");
1208
1209                         switch (child_id = fork()) {
1210                         case NOTOK:
1211                                 adios("fork", "unable to fork");
1212                                 /* NOTREACHED */
1213
1214                         case OK:
1215                                 if (!xstdout)
1216                                         dup2(fileno(out), 1);
1217                                 close(fileno(out));
1218                                 execvp("/bin/sh", vec);
1219                                 fprintf(stderr, "unable to exec ");
1220                                 perror("/bin/sh");
1221                                 _exit(-1);
1222                                 /* NOTREACHED */
1223
1224                         default:
1225                                 fclose(out);
1226                                 if (pidXwait(child_id, NULL))
1227                                         /* sysexits.h EX_SOFTWARE */
1228                                         exit(1);
1229                                 break;
1230                         }
1231                 }
1232                 break;
1233         }
1234
1235         return OK;
1236 }
1237
1238
1239 /*
1240 ** Scan the content.
1241 **
1242 **    1) choose a transfer encoding.
1243 **    2) check for clashes with multipart boundary string.
1244 **    3) for text content, figure out which character set is being used.
1245 **
1246 ** If there is a clash with one of the contents and the multipart boundary,
1247 ** this function will exit with NOTOK.  This will cause the scanning process
1248 ** to be repeated with a different multipart boundary.  It is possible
1249 ** (although highly unlikely) that this scan will be repeated multiple times.
1250 */
1251
1252 static int
1253 scan_content(CT ct)
1254 {
1255         int len;
1256         int check8bit = 0, contains8bit = 0;
1257         int checklinelen = 0, linelen = 0;
1258         int checkboundary = 0, boundaryclash = 0;
1259         int checklinespace = 0, linespace = 0;  /* trailing whitespace */
1260         unsigned char *cp = NULL, buffer[BUFSIZ];
1261         struct text *t = NULL;
1262         FILE *in = NULL;
1263         CE ce = ct->c_cefile;
1264
1265         /*
1266         ** handle multipart by scanning all subparts
1267         ** and then checking their encoding.
1268         */
1269         if (ct->c_type == CT_MULTIPART) {
1270                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1271                 struct part *part;
1272
1273                 /* initially mark the domain of enclosing multipart as 7bit */
1274                 ct->c_encoding = CE_7BIT;
1275
1276                 for (part = m->mp_parts; part; part = part->mp_next) {
1277                         CT p = part->mp_part;
1278
1279                         if (scan_content(p) == NOTOK) {
1280                                 /* choose encoding for subpart */
1281                                 return NOTOK;
1282                         }
1283
1284                         /*
1285                         ** if necessary, enlarge encoding for enclosing
1286                         ** multipart
1287                         */
1288                         if (p->c_encoding == CE_BINARY)
1289                                 ct->c_encoding = CE_BINARY;
1290                         if (p->c_encoding == CE_8BIT &&
1291                                         ct->c_encoding != CE_BINARY)
1292                                 ct->c_encoding = CE_8BIT;
1293                 }
1294
1295                 return OK;
1296         }
1297
1298         /*
1299         ** Decide what to check while scanning this content.
1300         */
1301         switch (ct->c_type) {
1302         case CT_TEXT:
1303                 check8bit = 1;
1304                 checkboundary = 1;
1305                 if (ct->c_subtype == TEXT_PLAIN) {
1306                         checklinelen = 0;
1307                         checklinespace = 0;
1308                 } else {
1309                         checklinelen = 1;
1310                         checklinespace = 1;
1311                 }
1312                 break;
1313
1314         case CT_MESSAGE:
1315                 check8bit = 0;
1316                 checklinelen = 0;
1317                 checklinespace = 0;
1318                 checkboundary = 1;
1319                 break;
1320
1321         case CT_APPLICATION:
1322         case CT_AUDIO:
1323         case CT_IMAGE:
1324         case CT_VIDEO:
1325                 check8bit = 0;
1326                 checklinelen = 0;
1327                 checklinespace = 0;
1328                 checkboundary = 0;
1329                 break;
1330         }
1331
1332         /*
1333         ** Scan the unencoded content
1334         */
1335         if (check8bit || checklinelen || checklinespace || checkboundary) {
1336                 if ((in = fopen(ce->ce_file, "r")) == NULL)
1337                         adios(ce->ce_file, "unable to open for reading");
1338                 len = strlen(prefix);
1339
1340                 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1341                         if (check8bit) {
1342                                 for (cp = buffer; *cp; cp++) {
1343                                         if (!isascii(*cp)) {
1344                                                 contains8bit = 1;
1345                                                 /* no need to keep checking */
1346                                                 check8bit = 0;
1347                                         }
1348                                 }
1349                         }
1350
1351                         if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1352                                 linelen = 1;
1353                                 checklinelen = 0;  /* no need to keep checking */
1354                         }
1355
1356                         if (checklinespace &&
1357                                         (cp = buffer + strlen(buffer) - 2) >
1358                                         buffer && isspace(*cp)) {
1359                                 linespace = 1;
1360                                 /* no need to keep checking */
1361                                 checklinespace = 0;
1362                         }
1363
1364                         /*
1365                         ** Check if content contains a line that clashes
1366                         ** with our standard boundary for multipart messages.
1367                         */
1368                         if (checkboundary && buffer[0] == '-' &&
1369                                         buffer[1] == '-') {
1370                                 for (cp = buffer + strlen(buffer) - 1;
1371                                                 cp >= buffer; cp--)
1372                                         if (!isspace(*cp))
1373                                                 break;
1374                                 *++cp = '\0';
1375                                 if (strncmp(buffer + 2, prefix, len)==0 &&
1376                                                 isdigit(buffer[2 + len])) {
1377                                         boundaryclash = 1;
1378                                         /* no need to keep checking */
1379                                         checkboundary = 0;
1380                                 }
1381                         }
1382                 }
1383                 fclose(in);
1384         }
1385
1386         /*
1387         ** Decide which transfer encoding to use.
1388         */
1389         switch (ct->c_type) {
1390         case CT_TEXT:
1391                 /*
1392                 ** If the text content didn't specify a character
1393                 ** set, we need to figure out which one was used.
1394                 */
1395                 t = (struct text *) ct->c_ctparams;
1396                 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1397                         CI ci = &ct->c_ctinfo;
1398                         char **ap, **ep;
1399
1400                         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1401                                 continue;
1402
1403                         if (contains8bit) {
1404                                 t->tx_charset = CHARSET_UNKNOWN;
1405                                 *ap = concat("charset=", write_charset_8bit(),
1406                                                 NULL);
1407                         } else {
1408                                 t->tx_charset = CHARSET_USASCII;
1409                                 *ap = getcpy("charset=us-ascii");
1410                         }
1411
1412                         cp = strchr(*ap++, '=');
1413                         *ap = NULL;
1414                         *cp++ = '\0';
1415                         *ep = cp;
1416                 }
1417
1418                 if (contains8bit || linelen || linespace)
1419                         ct->c_encoding = CE_QUOTED;
1420                 else
1421                         ct->c_encoding = CE_7BIT;
1422                 break;
1423
1424         case CT_MESSAGE:
1425                 ct->c_encoding = CE_7BIT;
1426                 break;
1427
1428         case CT_APPLICATION:
1429         case CT_AUDIO:
1430         case CT_IMAGE:
1431         case CT_VIDEO:
1432                 /*
1433                 ** Forcing use of base64, because these types likely
1434                 ** contain binary data and NUL bytes. Don't care about
1435                 ** files that would be clean.
1436                 */
1437                 ct->c_encoding = CE_BASE64;
1438                 break;
1439         }
1440
1441         return (boundaryclash ? NOTOK : OK);
1442 }
1443
1444
1445 /*
1446 ** Scan the content structures, and build header
1447 ** fields that will need to be output into the
1448 ** message.
1449 */
1450
1451 static int
1452 build_headers(CT ct)
1453 {
1454         int cc, len;
1455         char **ap, **ep;
1456         char *np, *vp, buffer[BUFSIZ];
1457         CI ci = &ct->c_ctinfo;
1458
1459         /*
1460         ** If message is type multipart, then add the multipart
1461         ** boundary to the list of attribute/value pairs.
1462         */
1463         if (ct->c_type == CT_MULTIPART) {
1464                 char *cp;
1465                 static int level = 0;  /* store nesting level */
1466
1467                 ap = ci->ci_attrs;
1468                 ep = ci->ci_values;
1469                 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1470                                 prefix, level++);
1471                 cp = strchr(*ap++ = getcpy(buffer), '=');
1472                 *ap = NULL;
1473                 *cp++ = '\0';
1474                 *ep = cp;
1475         }
1476
1477         /*
1478         ** output the content type and subtype
1479         */
1480         np = getcpy(TYPE_FIELD);
1481         vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1482
1483         /* keep track of length of line */
1484         len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1485                         strlen(ci->ci_subtype) + 3;
1486
1487         /*
1488         ** Append the attribute/value pairs to
1489         ** the end of the Content-Type line.
1490         */
1491         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1492                 vp = add(";", vp);
1493                 len++;
1494
1495                 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1496                 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1497                         vp = add("\n\t", vp);
1498                         len = 8;
1499                 } else {
1500                         vp = add(" ", vp);
1501                         len++;
1502                 }
1503                 vp = add(buffer, vp);
1504                 len += cc;
1505         }
1506
1507         /*
1508         ** Append any RFC-822 comment to the end of
1509         ** the Content-Type line.
1510         */
1511         if (ci->ci_comment) {
1512                 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1513                 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1514                         vp = add("\n\t", vp);
1515                         len = 8;
1516                 } else {
1517                         vp = add(" ", vp);
1518                         len++;
1519                 }
1520                 vp = add(buffer, vp);
1521                 len += cc;
1522         }
1523         vp = add("\n", vp);
1524         add_header(ct, np, vp);
1525
1526         /*
1527         ** output the Content-ID
1528         */
1529         if (ct->c_id) {
1530                 np = getcpy(ID_FIELD);
1531                 vp = concat(" ", ct->c_id, NULL);
1532                 add_header(ct, np, vp);
1533         }
1534
1535         /*
1536         ** output the Content-Description
1537         */
1538         if (ct->c_descr) {
1539                 np = getcpy(DESCR_FIELD);
1540                 vp = concat(" ", ct->c_descr, NULL);
1541                 add_header(ct, np, vp);
1542         }
1543
1544         /*
1545         ** output the Content-Disposition
1546         */
1547         if (ct->c_dispo) {
1548                 np = getcpy(DISPO_FIELD);
1549                 vp = concat(" ", ct->c_dispo, NULL);
1550                 add_header(ct, np, vp);
1551         }
1552
1553         /*
1554         ** output the Content-Transfer-Encoding
1555         */
1556         switch (ct->c_encoding) {
1557         case CE_7BIT:
1558                 /* Nothing to output */
1559                 break;
1560
1561         case CE_8BIT:
1562                 if (ct->c_type == CT_MESSAGE)
1563                         adios(NULL, "internal error, invalid encoding");
1564
1565                 np = getcpy(ENCODING_FIELD);
1566                 vp = concat(" ", "8bit", "\n", NULL);
1567                 add_header(ct, np, vp);
1568                 break;
1569
1570         case CE_QUOTED:
1571                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1572                         adios(NULL, "internal error, invalid encoding");
1573
1574                 np = getcpy(ENCODING_FIELD);
1575                 vp = concat(" ", "quoted-printable", "\n", NULL);
1576                 add_header(ct, np, vp);
1577                 break;
1578
1579         case CE_BASE64:
1580                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1581                         adios(NULL, "internal error, invalid encoding");
1582
1583                 np = getcpy(ENCODING_FIELD);
1584                 vp = concat(" ", "base64", "\n", NULL);
1585                 add_header(ct, np, vp);
1586                 break;
1587
1588         case CE_BINARY:
1589                 if (ct->c_type == CT_MESSAGE)
1590                         adios(NULL, "internal error, invalid encoding");
1591
1592                 np = getcpy(ENCODING_FIELD);
1593                 vp = concat(" ", "binary", "\n", NULL);
1594                 add_header(ct, np, vp);
1595                 break;
1596
1597         default:
1598                 adios(NULL, "unknown transfer encoding in content");
1599                 break;
1600         }
1601
1602         /*
1603         ** Additional content specific header processing
1604         */
1605         switch (ct->c_type) {
1606         case CT_MULTIPART:
1607         {
1608                 struct multipart *m;
1609                 struct part *part;
1610
1611                 m = (struct multipart *) ct->c_ctparams;
1612                 for (part = m->mp_parts; part; part = part->mp_next) {
1613                         CT p;
1614
1615                         p = part->mp_part;
1616                         build_headers(p);
1617                 }
1618         }
1619                 break;
1620
1621         default:
1622                 /* Nothing to do */
1623                 break;
1624         }
1625
1626         return OK;
1627 }