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

   1 /*
   2 ** mhbuild.c -- expand/translate MIME composition files
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 /*
  10 ** This code was originally part of mhn.c.  I split it into
  11 ** a separate program (mhbuild.c). But the code still has some of
  12 ** the mhn.c code in it.  This program needs additional
  13 ** streamlining and removal of unneeded code.
  14 */
  15
  16 #include <h/mh.h>
  17 #include <fcntl.h>
  18 #include <errno.h>
  19 #include <h/tws.h>
  20 #include <h/mime.h>
  21 #include <h/mhparse.h>
  22 #include <h/utils.h>
  23 #include <unistd.h>
  24 #include <ctype.h>
  25 #include <sys/stat.h>
  26 #include <locale.h>
  27 #include <sysexits.h>
  28
  29 #ifdef HAVE_SYS_TIME_H
  30 # include <sys/time.h>
  31 #endif
  32 #include <time.h>
  33
  34 static struct swit switches[] = {
  35 #define VERBSW  0
  36         { "verbose", 0 },
  37 #define NVERBSW  1
  38         { "noverbose", 2 },
  39 #define VERSIONSW  2
  40         { "Version", 0 },
  41 #define HELPSW  3
  42         { "help", 0 },
  43 #define DEBUGSW  4
  44         { "debug", -5 },
  45         { NULL, 0 }
  46 };
  47
  48
  49 /*
  50 ** Directory to place tmp files.  This must
  51 ** be set before these routines are called.
  52 */
  53 char *tmp;
  54
  55 pid_t xpid = 0;
  56
  57 static char prefix[] = "----- =_aaaaaaaaaa";
  58
  59
  60 /*
  61 ** prototypes
  62 */
  63
  64 /* mhmisc.c */
  65 int make_intermediates(char *);
  66 void content_error(char *, CT, char *, ...);
  67
  68 /* mhfree.c */
  69 void free_content(CT);
  70 void free_ctinfo(CT);
  71 void free_encoding(CT, int);
  72
  73 /*
  74 ** static prototypes
  75 */
  76 static int init_decoded_content(CT);
  77 static char *fgetstr(char *, int, FILE *);
  78 static int user_content(FILE *, char *, char *, CT *);
  79 static void set_id(CT, int);
  80 static int compose_content(CT);
  81 static int scan_content(CT);
  82 static int build_headers(CT);
  83 static CT build_mime(char *);
  84
  85
  86 int debugsw = 0;
  87 int verbosw = 0;
  88
  89 /*
  90 ** Temporary files
  91 */
  92 static char infile[BUFSIZ];
  93 static int unlink_infile  = 0;
  94
  95 static char outfile[BUFSIZ];
  96 static int unlink_outfile = 0;
  97
  98 void unlink_done();
  99
 100 /* mhoutsbr.c */
 101 int output_message(CT, char *);
 102 int output_message_fp(CT, FILE *, char*);
 103
 104 /* mhmisc.c */
 105 void set_endian(void);
 106
 107 /* mhfree.c */
 108 void free_content(CT);
 109
 110
 111 int
 112 main(int argc, char **argv)
 113 {
 114         char *cp, buf[BUFSIZ];
 115         char buffer[BUFSIZ], *compfile = NULL;
 116         char **argp, **arguments;
 117         CT ct;
 118         FILE *fp = NULL;
 119         FILE *fp_out = NULL;
 120
 121         if (atexit(unlink_done) != 0) {
 122                 adios(EX_OSERR, NULL, "atexit failed");
 123         }
 124
 125         setlocale(LC_ALL, "");
 126         invo_name = mhbasename(argv[0]);
 127
 128         /* read user profile/context */
 129         context_read();
 130
 131         arguments = getarguments(invo_name, argc, argv, 1);
 132         argp = arguments;
 133
 134         while ((cp = *argp++)) {
 135                 if (cp[0] == '-' && cp[1] == '\0') {
 136                         if (compfile)
 137                                 adios(EX_USAGE, NULL, "cannot specify both standard input and a file");
 138                         else
 139                                 compfile = cp;
 140                         verbosw = 0;  /* turn off -verbose listings */
 141                         break;
 142                 }
 143                 if (*cp == '-') {
 144                         switch (smatch(++cp, switches)) {
 145                         case AMBIGSW:
 146                                 ambigsw(cp, switches);
 147                                 exit(EX_USAGE);
 148                         case UNKWNSW:
 149                                 adios(EX_USAGE, NULL, "-%s unknown", cp);
 150
 151                         case HELPSW:
 152                                 snprintf(buf, sizeof(buf), "%s [switches] file", invo_name);
 153                                 print_help(buf, switches, 1);
 154                                 exit(argc == 2 ? EX_OK : EX_USAGE);
 155                         case VERSIONSW:
 156                                 print_version(invo_name);
 157                                 exit(argc == 2 ? EX_OK : EX_USAGE);
 158
 159                         case VERBSW:
 160                                 verbosw++;
 161                                 continue;
 162                         case NVERBSW:
 163                                 verbosw = 0;
 164                                 continue;
 165                         case DEBUGSW:
 166                                 debugsw = 1;
 167                                 continue;
 168                         }
 169                 }
 170                 if (compfile)
 171                         adios(EX_USAGE, NULL, "only one composition file allowed");
 172                 else
 173                         compfile = cp;
 174         }
 175
 176         set_endian();
 177
 178         /*
 179         ** Check if we've specified an additional profile
 180         */
 181         if ((cp = getenv("MHBUILD"))) {
 182                 if ((fp = fopen(cp, "r"))) {
 183                         readconfig((struct node **) 0, fp, cp, 0);
 184                         fclose(fp);
 185                 } else {
 186                         admonish("", "unable to read $MHBUILD profile (%s)",
 187                                         cp);
 188                 }
 189         }
 190
 191         /*
 192         ** Read the standard profile setup
 193         */
 194         if ((fp = fopen(cp = etcpath("mhn.defaults"), "r"))) {
 195                 readconfig((struct node **) 0, fp, cp, 0);
 196                 fclose(fp);
 197         }
 198
 199         /*
 200         ** Check for storage directory.  If defined, we
 201         ** will store temporary files there.  Else we
 202         ** store them in standard nmh directory.
 203         */
 204         if ((cp = context_find(nmhstorage)) && *cp)
 205                 tmp = concat(cp, "/", invo_name, NULL);
 206         else
 207                 tmp = getcpy(toabsdir(invo_name));
 208
 209         /* Check if we have a file to process */
 210         if (!compfile)
 211                 adios(EX_USAGE, NULL, "need to specify a %s composition file",
 212                                 invo_name);
 213
 214         /*
 215         ** Process the composition file from standard input.
 216         */
 217         if (compfile[0] == '-' && compfile[1] == '\0') {
 218                 /* copy standard input to temporary file */
 219                 strncpy(infile, m_mktemp(invo_name, NULL, &fp),
 220                                 sizeof(infile));
 221                 while (fgets(buffer, BUFSIZ, stdin))
 222                         fputs(buffer, fp);
 223                 fclose(fp);
 224                 unlink_infile = 1;
 225
 226                 /* build the content structures for MIME message */
 227                 ct = build_mime(infile);
 228
 229                 /* output MIME message to this temporary file */
 230                 strncpy(outfile, m_mktemp(invo_name, NULL, &fp_out),
 231                                 sizeof(outfile));
 232                 unlink_outfile = 1;
 233
 234                 /* output the message */
 235                 output_message_fp(ct, fp_out, outfile);
 236                 fclose(fp_out);
 237
 238                 /* output the temp file to standard output */
 239                 if ((fp = fopen(outfile, "r")) == NULL)
 240                         adios(EX_IOERR, outfile, "unable to open");
 241                 while (fgets(buffer, BUFSIZ, fp))
 242                         fputs(buffer, stdout);
 243                 fclose(fp);
 244
 245                 unlink(infile);
 246                 unlink_infile = 0;
 247
 248                 unlink(outfile);
 249                 unlink_outfile = 0;
 250
 251                 free_content(ct);
 252                 exit(EX_OK);
 253         }
 254
 255         /*
 256         ** Process the composition file from a file.
 257         */
 258
 259         /* build the content structures for MIME message */
 260         ct = build_mime(compfile);
 261
 262         /* output MIME message to this temporary file */
 263         strncpy(outfile, m_mktemp2(compfile, invo_name, NULL, &fp_out),
 264                         sizeof(outfile));
 265         unlink_outfile = 1;
 266
 267         /* output the message */
 268         output_message_fp(ct, fp_out, outfile);
 269         fclose(fp_out);
 270
 271         /* Rename composition draft */
 272         snprintf(buffer, sizeof(buffer), "%s.orig", compfile);
 273         if (rename(compfile, buffer) == NOTOK) {
 274                 adios(EX_IOERR, buffer, "unable to rename draft %s to", compfile);
 275         }
 276
 277         /* Rename output file to take its place */
 278         if (rename(outfile, compfile) == NOTOK) {
 279                 advise(compfile, "unable to rename output %s to", outfile);
 280                 rename(buffer, compfile);
 281                 exit(EX_IOERR);
 282         }
 283         unlink_outfile = 0;
 284
 285         free_content(ct);
 286         return 0;
 287 }
 288
 289
 290 void
 291 unlink_done()
 292 {
 293         /*
 294         ** Check if we need to remove stray temporary files.
 295         */
 296         if (unlink_infile) {
 297                 unlink(infile);
 298         }
 299         if (unlink_outfile) {
 300                 unlink(outfile);
 301         }
 302 }
 303
 304 /*
 305 ** Main routine for translating composition file
 306 ** into valid MIME message.  It translates the draft
 307 ** into a content structure (actually a tree of content
 308 ** structures).  This message then can be manipulated
 309 ** in various ways, including being output via
 310 ** output_message().
 311 */
 312 static CT
 313 build_mime(char *infile)
 314 {
 315         enum state state;
 316         struct field f = {{0}};
 317         int compnum;
 318         char buf[BUFSIZ];
 319         char *cp, *np, *vp;
 320         struct multipart *m;
 321         struct part **pp;
 322         CT ct;
 323         FILE *in;
 324         HF hp;
 325
 326         umask(~m_gmprot());
 327
 328         /* open the composition draft */
 329         if ((in = fopen(infile, "r")) == NULL) {
 330                 adios(EX_IOERR, infile, "unable to open for reading");
 331         }
 332
 333         /*
 334         ** Allocate space for primary (outside) content
 335         */
 336         if ((ct = (CT) mh_xcalloc(1, sizeof(*ct))) == NULL) {
 337                 adios(EX_OSERR, NULL, "out of memory");
 338         }
 339
 340         /*
 341         ** Allocate structure for handling decoded content
 342         ** for this part.  We don't really need this, but
 343         ** allocate it to remain consistent.
 344         */
 345         init_decoded_content(ct);
 346
 347         /*
 348         ** Parse some of the header fields in the composition
 349         ** draft into the linked list of header fields for
 350         ** the new MIME message.
 351         */
 352         for (compnum = 1, state = FLD2;;) {
 353                 switch (state = m_getfld2(state, &f, in)) {
 354                 case FLD2:
 355                         compnum++;
 356
 357                         /* abort if draft has Mime-Version header field */
 358                         if (!mh_strcasecmp(f.name, VRSN_FIELD)) {
 359                                 adios(EX_CONFIG, NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
 360                         }
 361
 362                         /*
 363                         ** abort if draft has Content-Transfer-Encoding
 364                         ** header field
 365                         */
 366                         if (!mh_strcasecmp(f.name, ENCODING_FIELD)) {
 367                                 adios(EX_CONFIG, NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
 368                         }
 369
 370                         /* ignore any Content-Type fields in the header */
 371                         if (!mh_strcasecmp(f.name, TYPE_FIELD)) {
 372                                 continue;
 373                         }
 374
 375                         /* add the header data to the list */
 376                         add_header(ct, getcpy(f.name), getcpy(f.value));
 377
 378                         continue;
 379
 380                 case BODY2:
 381                         fseek(in, (long) (-strlen(f.value)), SEEK_CUR);
 382                         break;
 383
 384                 case FILEEOF2:
 385                         adios(EX_CONFIG, NULL, "draft has empty body -- no directives!");
 386                         /* NOTREACHED */
 387
 388                 case LENERR2:
 389                 case FMTERR2:
 390                 case ERR2:
 391                         adios(EX_CONFIG, NULL, "message format error in component #%d",
 392                                         compnum);
 393
 394                 default:
 395                         adios(EX_SOFTWARE, NULL, "getfld() returned %d", state);
 396                 }
 397                 break;
 398         }
 399
 400         /*
 401         ** Iterate through the list of headers and call the function to
 402         ** MIME-ify them if required.
 403         */
 404         for (hp = ct->c_first_hf; hp != NULL; hp = hp->next) {
 405                 if (encode_rfc2047(hp->name, &hp->value, NULL)) {
 406                         adios(EX_DATAERR, NULL, "Unable to encode header \"%s\"", hp->name);
 407                 }
 408         }
 409
 410         /*
 411         ** Now add the MIME-Version header field
 412         ** to the list of header fields.
 413         */
 414         np = getcpy(VRSN_FIELD);
 415         vp = concat(" ", VRSN_VALUE, "\n", NULL);
 416         add_header(ct, np, vp);
 417
 418         /*
 419         ** We initally assume we will find multiple contents in the
 420         ** draft.  So create a multipart/mixed content to hold everything.
 421         ** We can remove this later, if it is not needed.
 422         */
 423         if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK) {
 424                 exit(EX_DATAERR);
 425         }
 426         ct->c_type = CT_MULTIPART;
 427         ct->c_subtype = MULTI_MIXED;
 428         ct->c_file = getcpy(infile);
 429
 430         if ((m = (struct multipart *) mh_xcalloc(1, sizeof(*m))) == NULL)
 431                 adios(EX_OSERR, NULL, "out of memory");
 432         ct->c_ctparams = (void *) m;
 433         pp = &m->mp_parts;
 434
 435         /*
 436         ** read and parse the composition file
 437         ** and the directives it contains.
 438         */
 439         while (fgetstr(buf, sizeof(buf) - 1, in)) {
 440                 struct part *part;
 441                 CT p;
 442
 443                 if (user_content(in, infile, buf, &p) == DONE) {
 444                         admonish(NULL, "ignoring spurious #end");
 445                         continue;
 446                 }
 447                 if (!p)
 448                         continue;
 449
 450                 if ((part = (struct part *) mh_xcalloc(1, sizeof(*part))) == NULL)
 451                         adios(EX_OSERR, NULL, "out of memory");
 452                 *pp = part;
 453                 pp = &part->mp_next;
 454                 part->mp_part = p;
 455         }
 456
 457         /*
 458         ** close the composition draft since
 459         ** it's not needed any longer.
 460         */
 461         fclose(in);
 462
 463         /* check if any contents were found */
 464         if (!m->mp_parts)
 465                 adios(EX_OSERR, NULL, "no content directives found");
 466
 467         /*
 468         ** If only one content was found, then remove and
 469         ** free the outer multipart content.
 470         */
 471         if (!m->mp_parts->mp_next) {
 472                 CT p;
 473
 474                 p = m->mp_parts->mp_part;
 475                 m->mp_parts->mp_part = NULL;
 476
 477                 /* move header fields */
 478                 p->c_first_hf = ct->c_first_hf;
 479                 p->c_last_hf = ct->c_last_hf;
 480                 ct->c_first_hf = NULL;
 481                 ct->c_last_hf = NULL;
 482
 483                 free_content(ct);
 484                 ct = p;
 485         } else {
 486                 set_id(ct, 1);
 487         }
 488
 489         /*
 490         ** Fill out, or expand directives.  Parse and execute
 491         ** commands specified by profile composition strings.
 492         */
 493         compose_content(ct);
 494
 495         if ((cp = strchr(prefix, 'a')) == NULL)
 496                 adios(EX_SOFTWARE, NULL, "internal error(4)");
 497
 498         /*
 499         ** Scan the contents.  Choose a transfer encoding, and
 500         ** check if prefix for multipart boundary clashes with
 501         ** any of the contents.
 502         */
 503         while (scan_content(ct) == NOTOK) {
 504                 if (*cp < 'z') {
 505                         (*cp)++;
 506                 } else {
 507                         if (*++cp == 0)
 508                                 adios(EX_SOFTWARE, NULL, "giving up trying to find a unique delimiter string");
 509                                 else
 510                                 (*cp)++;
 511                 }
 512         }
 513
 514         /* Build the rest of the header field structures */
 515         build_headers(ct);
 516
 517         return ct;
 518 }
 519
 520
 521 /*
 522 ** Set up structures for placing unencoded
 523 ** content when building parts.
 524 */
 525
 526 static int
 527 init_decoded_content(CT ct)
 528 {
 529         CE ce;
 530
 531         if ((ce = (CE) mh_xcalloc(1, sizeof(*ce))) == NULL)
 532                 adios(EX_OSERR, NULL, "out of memory");
 533
 534         ct->c_cefile     = ce;
 535         ct->c_ceopenfnx  = open7Bit;  /* since unencoded */
 536         ct->c_ceclosefnx = close_encoding;
 537         ct->c_cesizefnx  = NULL;  /* since unencoded */
 538
 539         return OK;
 540 }
 541
 542
 543 static char *
 544 fgetstr(char *s, int n, FILE *stream)
 545 {
 546         char *cp, *ep;
 547
 548         for (ep = (cp = s) + n; cp < ep; ) {
 549                 int i;
 550
 551                 if (!fgets(cp, n, stream))
 552                         return (cp != s ? s : NULL);
 553                 if (cp == s && *cp != '#')
 554                         return s;
 555
 556                 cp += (i = strlen(cp)) - 1;
 557                 if (i <= 1 || *cp-- != '\n' || *cp != '\\')
 558                         break;
 559                 *cp = '\0';
 560                 n -= (i - 2);
 561         }
 562
 563         return s;
 564 }
 565
 566
 567 /*
 568 ** Parse the composition draft for text and directives.
 569 ** Do initial setup of Content structure.
 570 */
 571
 572 static int
 573 user_content(FILE *in, char *file, char *buf, CT *ctp)
 574 {
 575         int vrsn;
 576         unsigned char *cp;
 577         char **ap;
 578         char buffer[BUFSIZ];
 579         struct multipart *m;
 580         struct part **pp;
 581         struct str2init *s2i;
 582         CI ci;
 583         CT ct;
 584         CE ce;
 585
 586         if (buf[0] == '\n' || strcmp(buf, "#\n") == 0) {
 587                 *ctp = NULL;
 588                 return OK;
 589         }
 590
 591         /* allocate basic Content structure */
 592         if ((ct = (CT) mh_xcalloc(1, sizeof(*ct))) == NULL)
 593                 adios(EX_OSERR, NULL, "out of memory");
 594         *ctp = ct;
 595
 596         /* allocate basic structure for handling decoded content */
 597         init_decoded_content(ct);
 598         ce = ct->c_cefile;
 599
 600         ci = &ct->c_ctinfo;
 601         set_id(ct, 0);
 602
 603         /*
 604         ** Handle inline text.  Check if line
 605         ** is one of the following forms:
 606         **
 607         ** 1) doesn't begin with '#'  (implicit directive)
 608         ** 2) begins with "##"        (implicit directive)
 609         ** 3) begins with "#<"
 610         */
 611         if (buf[0] != '#' || buf[1] == '#' || buf[1] == '<') {
 612                 int headers;
 613                 int inlineD;
 614                 long pos;
 615                 char content[BUFSIZ];
 616                 FILE *out;
 617                 char *cp;
 618
 619                 cp = m_mktemp2(NULL, invo_name, NULL, &out);
 620                 if (cp == NULL)
 621                         adios(EX_CANTCREAT, "mhbuild", "unable to create temporary file");
 622
 623                 /* use a temp file to collect the plain text lines */
 624                 ce->ce_file = getcpy(cp);
 625                 ce->ce_unlink = 1;
 626
 627                 if (buf[0] == '#' && buf[1] == '<') {
 628                         strncpy(content, buf + 2, sizeof(content));
 629                         inlineD = 1;
 630                         goto rock_and_roll;
 631                 } else {
 632                         inlineD = 0;
 633                 }
 634
 635                 /* the directive is implicit */
 636                 strncpy(content, "text/plain", sizeof(content));
 637                 headers = 0;
 638                 strncpy(buffer, buf[0] != '#' ? buf : buf + 1, sizeof(buffer));
 639                 for (;;) {
 640                         int i;
 641
 642                         if (headers >= 0 && uprf(buffer, DESCR_FIELD) &&
 643                                         buffer[i=strlen(DESCR_FIELD)] == ':') {
 644                                 headers = 1;
 645
 646 again_descr:
 647                                 ct->c_descr = add(buffer + i + 1, ct->c_descr);
 648                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 649                                         adios(EX_DATAERR, NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD);
 650                                 switch (buffer[0]) {
 651                                 case ' ':
 652                                 case '\t':
 653                                         i = -1;
 654                                         goto again_descr;
 655
 656                                 case '#':
 657                                         adios(EX_DATAERR, NULL, "#-directive after %s: field in plaintext", DESCR_FIELD);
 658                                         /* NOTREACHED */
 659
 660                                 default:
 661                                         break;
 662                                 }
 663                         }
 664
 665                         if (headers >= 0 && uprf(buffer, DISPO_FIELD)
 666                                 && buffer[i = strlen(DISPO_FIELD)] == ':') {
 667                                 headers = 1;
 668
 669 again_dispo:
 670                                 ct->c_dispo = add(buffer + i + 1, ct->c_dispo);
 671                                 if (!fgetstr(buffer, sizeof(buffer) - 1, in))
 672                                         adios(EX_DATAERR, NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD);
 673                                 switch (buffer[0]) {
 674                                 case ' ':
 675                                 case '\t':
 676                                         i = -1;
 677                                         goto again_dispo;
 678
 679                                 case '#':
 680                                         adios(EX_DATAERR, NULL, "#-directive after %s: field in plaintext", DISPO_FIELD);
 681                                         /* NOTREACHED */
 682
 683                                 default:
 684                                         break;
 685                                 }
 686                         }
 687
 688                         if (headers != 1 || buffer[0] != '\n')
 689                                 fputs(buffer, out);
 690
 691 rock_and_roll:
 692                         headers = -1;
 693                         pos = ftell(in);
 694                         if ((cp = fgetstr(buffer, sizeof(buffer) - 1, in))
 695                                         == NULL)
 696                                 break;
 697                         if (buffer[0] == '#') {
 698                                 char *bp;
 699
 700                                 if (buffer[1] != '#')
 701                                         break;
 702                                 for (cp = (bp = buffer) + 1; *cp; cp++)
 703                                         *bp++ = *cp;
 704                                 *bp = '\0';
 705                         }
 706                 }
 707
 708                 fclose(out);
 709
 710                 /* parse content type */
 711                 if (get_ctinfo(content, ct, inlineD) == NOTOK)
 712                         exit(EX_DATAERR);
 713
 714                 for (s2i = str2cts; s2i->si_key; s2i++)
 715                         if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 716                                 break;
 717                 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
 718                         s2i++;
 719
 720                 /*
 721                 ** check type specified (possibly implicitly)
 722                 */
 723                 switch (ct->c_type = s2i->si_val) {
 724                 case CT_MESSAGE:
 725                         if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
 726                                 ct->c_encoding = CE_7BIT;
 727                                 goto call_init;
 728                         }
 729                         /* else fall... */
 730                 case CT_MULTIPART:
 731                         adios(EX_DATAERR, NULL, "it doesn't make sense to define an in-line %s content",
 732                                         ct->c_type == CT_MESSAGE ? "message" :
 733                                         "multipart");
 734                         /* NOTREACHED */
 735
 736                 default:
 737 call_init:
 738                         if ((ct->c_ctinitfnx = s2i->si_init))
 739                                 (*ct->c_ctinitfnx) (ct);
 740                         break;
 741                 }
 742
 743                 if (cp)
 744                         fseek(in, pos, SEEK_SET);
 745                 return OK;
 746         }
 747
 748         /*
 749         ** If we've reached this point, the next line
 750         ** must be some type of explicit directive.
 751         */
 752
 753         if (buf[1] == '@') {
 754                 adios(EX_DATAERR, NULL, "The #@ directive i.e. message/external-body "
 755                                 "is not supported anymore.");
 756         }
 757
 758         /* parse directive */
 759         if (get_ctinfo(buf+1, ct, 1) == NOTOK)
 760                 exit(EX_DATAERR);
 761
 762         /* check directive against the list of MIME types */
 763         for (s2i = str2cts; s2i->si_key; s2i++)
 764                 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 765                         break;
 766
 767         /*
 768         ** Check if the directive specified a valid type.
 769         ** This will happen if it was one of the following forms:
 770         **
 771         **    #type/subtype
 772         */
 773         if (s2i->si_key) {
 774                 if (!ci->ci_subtype)
 775                         adios(EX_DATAERR, NULL, "missing subtype in \"#%s\"", ci->ci_type);
 776
 777                 switch (ct->c_type = s2i->si_val) {
 778                 case CT_MULTIPART:
 779                         adios(EX_DATAERR, NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 780                         /* NOTREACHED */
 781
 782                 case CT_MESSAGE:
 783                         if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
 784                                         !mh_strcasecmp(ci->ci_subtype,
 785                                         "external-body")) {
 786                                 adios(EX_DATAERR, NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
 787                         }
 788 use_forw:
 789                         admonish(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 790                         /* FALL */
 791
 792                 default:
 793                         if ((ct->c_ctinitfnx = s2i->si_init))
 794                                 (*ct->c_ctinitfnx) (ct);
 795                         break;
 796                 }
 797
 798                 /* Handle [file] argument */
 799                 if (ci->ci_magic) {
 800                         /* check if specifies command to execute */
 801                         if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
 802                                 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
 803                                         continue;
 804                                 if (!*cp)
 805                                         adios(EX_DATAERR, NULL, "empty pipe command for #%s directive", ci->ci_type);
 806                                 cp = getcpy(cp);
 807                                 free(ci->ci_magic);
 808                                 ci->ci_magic = cp;
 809                         } else {
 810                                 /* record filename of decoded contents */
 811                                 ce->ce_file = ci->ci_magic;
 812                                 if (access(ce->ce_file, R_OK) == NOTOK)
 813                                         adios(EX_IOERR, "reading", "unable to access %s for", ce->ce_file);
 814                                 ci->ci_magic = NULL;
 815                         }
 816                         return OK;
 817                 }
 818
 819                 /*
 820                 ** No [file] argument, so check profile for
 821                 ** method to compose content.
 822                 */
 823                 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
 824                                 invo_name, ci->ci_type, ci->ci_subtype);
 825                 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
 826                         snprintf(buffer, sizeof(buffer), "%s-compose-%s",
 827                                         invo_name, ci->ci_type);
 828                         if ((cp = context_find(buffer)) == NULL ||
 829                                         *cp == '\0') {
 830                                 content_error(NULL, ct, "don't know how to compose content");
 831                                 exit(EX_CONFIG);
 832                         }
 833                 }
 834                 ci->ci_magic = getcpy(cp);
 835                 return OK;
 836         }
 837
 838         /*
 839         ** Message directive
 840         ** #forw [+folder] [msgs]
 841         */
 842         if (!mh_strcasecmp(ci->ci_type, "forw")) {
 843                 int msgnum;
 844                 char *folder, *arguments[MAXARGS];
 845                 struct msgs *mp;
 846
 847                 if (ci->ci_magic) {
 848                         int i;
 849
 850                         ap = brkstring(ci->ci_magic, " ", "\n");
 851                         for (i=0; ap[i] && i<MAXARGS-1; i++) {
 852                                 arguments[i] = ap[i];
 853                         }
 854                         arguments[i] = NULL;
 855
 856                 } else {
 857                         arguments[0] = seq_cur;
 858                         arguments[1] = NULL;
 859                 }
 860                 folder = NULL;
 861
 862                 /* search the arguments for a folder name */
 863                 for (ap = arguments; *ap; ap++) {
 864                         cp = *ap;
 865                         if (*cp == '+' || *cp == '@') {
 866                                 if (folder)
 867                                         adios(EX_USAGE, NULL, "only one folder per #forw directive");
 868                                 else
 869                                         folder = getcpy(expandfol(cp));
 870                         }
 871                 }
 872
 873                 /* else, use the current folder */
 874                 if (!folder)
 875                         folder = getcpy(getcurfol());
 876
 877                 if (!(mp = folder_read(folder)))
 878                         adios(EX_IOERR, NULL, "unable to read folder %s", folder);
 879                 for (ap = arguments; *ap; ap++) {
 880                         cp = *ap;
 881                         if (*cp != '+' && *cp != '@')
 882                                 if (!m_convert(mp, cp))
 883                                         exit(EX_USAGE);
 884                 }
 885                 free(folder);
 886                 free_ctinfo(ct);
 887
 888                 /*
 889                 ** If there is more than one message to include, make this
 890                 ** a content of type "multipart/digest" and insert each message
 891                 ** as a subpart.  If there is only one message, then make this
 892                 ** a content of type "message/rfc822".
 893                 */
 894                 if (mp->numsel > 1) {
 895                         /* we are forwarding multiple messages */
 896                         if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
 897                                 exit(EX_DATAERR);
 898                         ct->c_type = CT_MULTIPART;
 899                         ct->c_subtype = MULTI_DIGEST;
 900
 901                         if ((m = (struct multipart *)
 902                                         mh_xcalloc(1, sizeof(*m))) == NULL)
 903                                 adios(EX_OSERR, NULL, "out of memory");
 904                         ct->c_ctparams = (void *) m;
 905                         pp = &m->mp_parts;
 906
 907                         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 908                                 if (is_selected(mp, msgnum)) {
 909                                         struct part *part;
 910                                         CT p;
 911                                         CE pe;
 912
 913                                         if ((p = (CT) mh_xcalloc(1, sizeof(*p)))
 914                                                         == NULL)
 915                                                 adios(EX_OSERR, NULL, "out of memory");
 916                                         init_decoded_content(p);
 917                                         pe = p->c_cefile;
 918                                         if (get_ctinfo("message/rfc822", p, 0)
 919                                                         == NOTOK)
 920                                                 exit(EX_DATAERR);
 921                                         p->c_type = CT_MESSAGE;
 922                                         p->c_subtype = MESSAGE_RFC822;
 923
 924                                         snprintf(buffer, sizeof(buffer),
 925                                                         "%s/%d", mp->foldpath,
 926                                                         msgnum);
 927                                         pe->ce_file = getcpy(buffer);
 928
 929                                         if ((part = (struct part *) mh_xcalloc(1, sizeof(*part))) == NULL)
 930                                                 adios(EX_OSERR, NULL, "out of memory");
 931                                         *pp = part;
 932                                         pp = &part->mp_next;
 933                                         part->mp_part = p;
 934                                 }
 935                         }
 936                 } else {
 937                         /* we are forwarding one message */
 938                         if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
 939                                 exit(EX_DATAERR);
 940                         ct->c_type = CT_MESSAGE;
 941                         ct->c_subtype = MESSAGE_RFC822;
 942
 943                         msgnum = mp->lowsel;
 944                         snprintf(buffer, sizeof(buffer), "%s/%d",
 945                                         mp->foldpath, msgnum);
 946                         ce->ce_file = getcpy(buffer);
 947                 }
 948
 949                 folder_free(mp);  /* free folder/message structure */
 950                 return OK;
 951         }
 952
 953         /*
 954         ** #end
 955         */
 956         if (!mh_strcasecmp(ci->ci_type, "end")) {
 957                 free_content(ct);
 958                 *ctp = NULL;
 959                 return DONE;
 960         }
 961
 962         /*
 963         ** #begin [ alternative | parallel ]
 964         */
 965         if (!mh_strcasecmp(ci->ci_type, "begin")) {
 966                 if (!ci->ci_magic) {
 967                         vrsn = MULTI_MIXED;
 968                         cp = SubMultiPart[vrsn - 1].kv_key;
 969                 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
 970                         vrsn = MULTI_ALTERNATE;
 971                         cp = SubMultiPart[vrsn - 1].kv_key;
 972                 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
 973                         vrsn = MULTI_PARALLEL;
 974                         cp = SubMultiPart[vrsn - 1].kv_key;
 975                 } else if (uprf(ci->ci_magic, "digest")) {
 976                         goto use_forw;
 977                 } else {
 978                         vrsn = MULTI_UNKNOWN;
 979                         cp = ci->ci_magic;
 980                 }
 981
 982                 free_ctinfo(ct);
 983                 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
 984                 if (get_ctinfo(buffer, ct, 0) == NOTOK)
 985                         exit(EX_DATAERR);
 986                 ct->c_type = CT_MULTIPART;
 987                 ct->c_subtype = vrsn;
 988
 989                 if ((m = (struct multipart *) mh_xcalloc(1, sizeof(*m))) == NULL)
 990                         adios(EX_OSERR, NULL, "out of memory");
 991                 ct->c_ctparams = (void *) m;
 992
 993                 pp = &m->mp_parts;
 994                 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
 995                         struct part *part;
 996                         CT p;
 997
 998                         if (user_content(in, file, buffer, &p) == DONE) {
 999                                 if (!m->mp_parts)
1000                                         adios(EX_DATAERR, NULL, "empty \"#begin ... #end\" sequence");
1001                                 return OK;
1002                         }
1003                         if (!p)
1004                                 continue;
1005
1006                         if ((part = (struct part *)
1007                                         mh_xcalloc(1, sizeof(*part))) == NULL)
1008                                 adios(EX_OSERR, NULL, "out of memory");
1009                         *pp = part;
1010                         pp = &part->mp_next;
1011                         part->mp_part = p;
1012                 }
1013                 admonish(NULL, "premature end-of-file, missing #end");
1014                 return OK;
1015         }
1016
1017         /*
1018         ** Unknown directive
1019         */
1020         adios(EX_DATAERR, NULL, "unknown directive \"#%s\"", ci->ci_type);
1021         return NOTOK;  /* NOT REACHED */
1022 }
1023
1024
1025 static void
1026 set_id(CT ct, int top)
1027 {
1028         char msgid[BUFSIZ];
1029         static int partno;
1030         static time_t clock = 0;
1031         static char *msgfmt;
1032
1033         if (clock == 0) {
1034                 time(&clock);
1035                 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1036                                 (int) getpid(), (long) clock, LocalName());
1037                 partno = 0;
1038                 msgfmt = getcpy(msgid);
1039         }
1040         snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1041         ct->c_id = getcpy(msgid);
1042 }
1043
1044
1045 /*
1046 ** Fill out, or expand the various contents in the composition
1047 ** draft.  Read-in any necessary files.  Parse and execute any
1048 ** commands specified by profile composition strings.
1049 */
1050
1051 static int
1052 compose_content(CT ct)
1053 {
1054         CE ce = ct->c_cefile;
1055
1056         switch (ct->c_type) {
1057         case CT_MULTIPART:
1058         {
1059                 int partnum;
1060                 char *pp;
1061                 char partnam[BUFSIZ];
1062                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1063                 struct part *part;
1064
1065                 if (ct->c_partno) {
1066                         snprintf(partnam, sizeof(partnam), "%s.",
1067                                         ct->c_partno);
1068                         pp = partnam + strlen(partnam);
1069                 } else {
1070                         pp = partnam;
1071                 }
1072
1073                 /* first, we call compose_content on all the subparts */
1074                 for (part = m->mp_parts, partnum = 1; part;
1075                                 part = part->mp_next, partnum++) {
1076                         CT p = part->mp_part;
1077
1078                         sprintf(pp, "%d", partnum);
1079                         p->c_partno = getcpy(partnam);
1080                         if (compose_content(p) == NOTOK)
1081                                 return NOTOK;
1082                 }
1083         }
1084         break;
1085
1086         case CT_MESSAGE:
1087                 /* Nothing to do for type message */
1088                 break;
1089
1090         /*
1091         ** Discrete types (text/application/audio/image/video)
1092         */
1093         default:
1094                 if (!ce->ce_file) {
1095                         pid_t child_id;
1096                         int xstdout, len, buflen;
1097                         char *bp, **ap, *cp;
1098                         char *vec[4], buffer[BUFSIZ];
1099                         FILE *out;
1100                         CI ci = &ct->c_ctinfo;
1101                         char *tfile = NULL;
1102
1103                         if (!(cp = ci->ci_magic))
1104                                 adios(EX_SOFTWARE, NULL, "internal error(5)");
1105
1106                         tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1107                         if (tfile == NULL) {
1108                                 adios(EX_CANTCREAT, "mhbuild", "unable to create temporary file");
1109                         }
1110                         ce->ce_file = getcpy(tfile);
1111                         ce->ce_unlink = 1;
1112
1113                         xstdout = 0;
1114
1115                         /* Get buffer ready to go */
1116                         bp = buffer;
1117                         bp[0] = '\0';
1118                         buflen = sizeof(buffer);
1119
1120                         /*
1121                         ** Parse composition string into buffer
1122                         */
1123                         for ( ; *cp; cp++) {
1124                                 if (*cp == '%') {
1125                                         switch (*++cp) {
1126                                         case 'a':
1127                                         {
1128                                                 /*
1129                                                 ** insert parameters from
1130                                                 ** directive
1131                                                 */
1132                                                 char **ep;
1133                                                 char *s = "";
1134
1135                                                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1136                                                         snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1137                                                         len = strlen(bp);
1138                                                         bp += len;
1139                                                         buflen -= len;
1140                                                         s = " ";
1141                                                 }
1142                                         }
1143                                         break;
1144
1145                                         case 'F':
1146                                                 /* %f, and stdout is not-redirected */
1147                                                 xstdout = 1;
1148                                                 /* and fall... */
1149
1150                                         case 'f':
1151                                                 /*
1152                                                 ** insert temporary filename
1153                                                 ** where content should be
1154                                                 ** written
1155                                                 */
1156                                                 snprintf(bp, buflen, "%s", ce->ce_file);
1157                                                 break;
1158
1159                                         case 's':
1160                                                 /* insert content subtype */
1161                                                 strncpy(bp, ci->ci_subtype, buflen);
1162                                                 break;
1163
1164                                         case '%':
1165                                                 /* insert character % */
1166                                                 goto raw;
1167
1168                                         default:
1169                                                 *bp++ = *--cp;
1170                                                 *bp = '\0';
1171                                                 buflen--;
1172                                                 continue;
1173                                         }
1174                                         len = strlen(bp);
1175                                         bp += len;
1176                                         buflen -= len;
1177                                 } else {
1178 raw:
1179                                         *bp++ = *cp;
1180                                         *bp = '\0';
1181                                         buflen--;
1182                                 }
1183                         }
1184
1185                         if (verbosw)
1186                                 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1187
1188                         fflush(stdout);  /* not sure if need for -noverbose */
1189
1190                         vec[0] = "/bin/sh";
1191                         vec[1] = "-c";
1192                         vec[2] = buffer;
1193                         vec[3] = NULL;
1194
1195                         if ((out = fopen(ce->ce_file, "w")) == NULL)
1196                                 adios(EX_IOERR, ce->ce_file, "unable to open for writing");
1197
1198                         switch (child_id = fork()) {
1199                         case NOTOK:
1200                                 adios(EX_OSERR, "fork", "unable to fork");
1201                                 /* NOTREACHED */
1202
1203                         case OK:
1204                                 if (!xstdout)
1205                                         dup2(fileno(out), 1);
1206                                 close(fileno(out));
1207                                 execvp("/bin/sh", vec);
1208                                 fprintf(stderr, "unable to exec ");
1209                                 perror("/bin/sh");
1210                                 _exit(EX_OSERR);
1211                                 /* NOTREACHED */
1212
1213                         default:
1214                                 fclose(out);
1215                                 if (pidXwait(child_id, NULL))
1216                                         exit(EX_SOFTWARE);
1217                                 break;
1218                         }
1219                 }
1220                 break;
1221         }
1222
1223         return OK;
1224 }
1225
1226
1227 /*
1228 ** Scan the content.
1229 **
1230 **    1) choose a transfer encoding.
1231 **    2) check for clashes with multipart boundary string.
1232 **    3) for text content, figure out which character set is being used.
1233 **
1234 ** If there is a clash with one of the contents and the multipart boundary,
1235 ** this function will exit with NOTOK.  This will cause the scanning process
1236 ** to be repeated with a different multipart boundary.  It is possible
1237 ** (although highly unlikely) that this scan will be repeated multiple times.
1238 */
1239
1240 static int
1241 scan_content(CT ct)
1242 {
1243         int len;
1244         int check8bit = 0, contains8bit = 0;
1245         int checklinelen = 0, linelen = 0;
1246         int checkboundary = 0, boundaryclash = 0;
1247         int checklinespace = 0, linespace = 0;  /* trailing whitespace */
1248         unsigned char *cp = NULL, buffer[BUFSIZ];
1249         struct text *t = NULL;
1250         FILE *in = NULL;
1251         CE ce = ct->c_cefile;
1252
1253         /*
1254         ** handle multipart by scanning all subparts
1255         ** and then checking their encoding.
1256         */
1257         if (ct->c_type == CT_MULTIPART) {
1258                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1259                 struct part *part;
1260
1261                 /* initially mark the domain of enclosing multipart as 7bit */
1262                 ct->c_encoding = CE_7BIT;
1263
1264                 for (part = m->mp_parts; part; part = part->mp_next) {
1265                         CT p = part->mp_part;
1266
1267                         if (scan_content(p) == NOTOK) {
1268                                 /* choose encoding for subpart */
1269                                 return NOTOK;
1270                         }
1271
1272                         /*
1273                         ** if necessary, enlarge encoding for enclosing
1274                         ** multipart
1275                         */
1276                         if (p->c_encoding == CE_BINARY)
1277                                 ct->c_encoding = CE_BINARY;
1278                         if (p->c_encoding == CE_8BIT &&
1279                                         ct->c_encoding != CE_BINARY)
1280                                 ct->c_encoding = CE_8BIT;
1281                 }
1282
1283                 return OK;
1284         }
1285
1286         /*
1287         ** Decide what to check while scanning this content.
1288         */
1289         switch (ct->c_type) {
1290         case CT_TEXT:
1291                 check8bit = 1;
1292                 checkboundary = 1;
1293                 if (ct->c_subtype == TEXT_PLAIN) {
1294                         checklinelen = 0;
1295                         checklinespace = 0;
1296                 } else {
1297                         checklinelen = 1;
1298                         checklinespace = 1;
1299                 }
1300                 break;
1301
1302         case CT_MESSAGE:
1303                 check8bit = 0;
1304                 checklinelen = 0;
1305                 checklinespace = 0;
1306                 checkboundary = 1;
1307                 break;
1308
1309         case CT_APPLICATION:
1310         case CT_AUDIO:
1311         case CT_IMAGE:
1312         case CT_VIDEO:
1313                 check8bit = 0;
1314                 checklinelen = 0;
1315                 checklinespace = 0;
1316                 checkboundary = 0;
1317                 break;
1318         }
1319
1320         /*
1321         ** Scan the unencoded content
1322         */
1323         if (check8bit || checklinelen || checklinespace || checkboundary) {
1324                 if ((in = fopen(ce->ce_file, "r")) == NULL)
1325                         adios(EX_IOERR, ce->ce_file, "unable to open for reading");
1326                 len = strlen(prefix);
1327
1328                 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1329                         if (check8bit) {
1330                                 for (cp = buffer; *cp; cp++) {
1331                                         if (!isascii(*cp)) {
1332                                                 contains8bit = 1;
1333                                                 /* no need to keep checking */
1334                                                 check8bit = 0;
1335                                         }
1336                                 }
1337                         }
1338
1339                         if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1340                                 linelen = 1;
1341                                 checklinelen = 0;  /* no need to keep checking */
1342                         }
1343
1344                         if (checklinespace &&
1345                                         (cp = buffer + strlen(buffer) - 2) >
1346                                         buffer && isspace(*cp)) {
1347                                 linespace = 1;
1348                                 /* no need to keep checking */
1349                                 checklinespace = 0;
1350                         }
1351
1352                         /*
1353                         ** Check if content contains a line that clashes
1354                         ** with our standard boundary for multipart messages.
1355                         */
1356                         if (checkboundary && buffer[0] == '-' &&
1357                                         buffer[1] == '-') {
1358                                 for (cp = buffer + strlen(buffer) - 1;
1359                                                 cp >= buffer; cp--)
1360                                         if (!isspace(*cp))
1361                                                 break;
1362                                 *++cp = '\0';
1363                                 if (strncmp(buffer + 2, prefix, len)==0 &&
1364                                                 isdigit(buffer[2 + len])) {
1365                                         boundaryclash = 1;
1366                                         /* no need to keep checking */
1367                                         checkboundary = 0;
1368                                 }
1369                         }
1370                 }
1371                 fclose(in);
1372         }
1373
1374         /*
1375         ** Decide which transfer encoding to use.
1376         */
1377         switch (ct->c_type) {
1378         case CT_TEXT:
1379                 /*
1380                 ** If the text content didn't specify a character
1381                 ** set, we need to figure out which one was used.
1382                 */
1383                 t = (struct text *) ct->c_ctparams;
1384                 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1385                         CI ci = &ct->c_ctinfo;
1386                         char **ap, **ep;
1387
1388                         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1389                                 continue;
1390
1391                         if (contains8bit) {
1392                                 t->tx_charset = CHARSET_UNKNOWN;
1393                                 *ap = concat("charset=", write_charset_8bit(),
1394                                                 NULL);
1395                         } else {
1396                                 t->tx_charset = CHARSET_USASCII;
1397                                 *ap = getcpy("charset=us-ascii");
1398                         }
1399
1400                         cp = strchr(*ap++, '=');
1401                         *ap = NULL;
1402                         *cp++ = '\0';
1403                         *ep = cp;
1404                 }
1405
1406                 if (contains8bit || linelen || linespace)
1407                         ct->c_encoding = CE_QUOTED;
1408                 else
1409                         ct->c_encoding = CE_7BIT;
1410                 break;
1411
1412         case CT_MESSAGE:
1413                 ct->c_encoding = CE_7BIT;
1414                 break;
1415
1416         case CT_APPLICATION:
1417         case CT_AUDIO:
1418         case CT_IMAGE:
1419         case CT_VIDEO:
1420                 /*
1421                 ** Forcing use of base64, because these types likely
1422                 ** contain binary data and NUL bytes. Don't care about
1423                 ** files that would be clean.
1424                 */
1425                 ct->c_encoding = CE_BASE64;
1426                 break;
1427         }
1428
1429         return (boundaryclash ? NOTOK : OK);
1430 }
1431
1432
1433 /*
1434 ** Scan the content structures, and build header
1435 ** fields that will need to be output into the
1436 ** message.
1437 */
1438
1439 static int
1440 build_headers(CT ct)
1441 {
1442         int cc, len;
1443         char **ap, **ep;
1444         char *np, *vp, buffer[BUFSIZ];
1445         CI ci = &ct->c_ctinfo;
1446
1447         /*
1448         ** If message is type multipart, then add the multipart
1449         ** boundary to the list of attribute/value pairs.
1450         */
1451         if (ct->c_type == CT_MULTIPART) {
1452                 char *cp;
1453                 static int level = 0;  /* store nesting level */
1454
1455                 ap = ci->ci_attrs;
1456                 ep = ci->ci_values;
1457                 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1458                                 prefix, level++);
1459                 cp = strchr(*ap++ = getcpy(buffer), '=');
1460                 *ap = NULL;
1461                 *cp++ = '\0';
1462                 *ep = cp;
1463         }
1464
1465         /*
1466         ** output the content type and subtype
1467         */
1468         np = getcpy(TYPE_FIELD);
1469         vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1470
1471         /* keep track of length of line */
1472         len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1473                         strlen(ci->ci_subtype) + 3;
1474
1475         /*
1476         ** Append the attribute/value pairs to
1477         ** the end of the Content-Type line.
1478         */
1479         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1480                 vp = add(";", vp);
1481                 len++;
1482
1483                 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1484                 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1485                         vp = add("\n\t", vp);
1486                         len = 8;
1487                 } else {
1488                         vp = add(" ", vp);
1489                         len++;
1490                 }
1491                 vp = add(buffer, vp);
1492                 len += cc;
1493         }
1494
1495         /*
1496         ** Append any RFC-822 comment to the end of
1497         ** the Content-Type line.
1498         */
1499         if (ci->ci_comment) {
1500                 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1501                 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1502                         vp = add("\n\t", vp);
1503                         len = 8;
1504                 } else {
1505                         vp = add(" ", vp);
1506                         len++;
1507                 }
1508                 vp = add(buffer, vp);
1509                 len += cc;
1510         }
1511         vp = add("\n", vp);
1512         add_header(ct, np, vp);
1513
1514         /*
1515         ** output the Content-ID
1516         */
1517         if (ct->c_id) {
1518                 np = getcpy(ID_FIELD);
1519                 vp = concat(" ", ct->c_id, NULL);
1520                 add_header(ct, np, vp);
1521         }
1522
1523         /*
1524         ** output the Content-Description
1525         */
1526         if (ct->c_descr) {
1527                 np = getcpy(DESCR_FIELD);
1528                 vp = concat(" ", ct->c_descr, NULL);
1529                 if (encode_rfc2047(DESCR_FIELD, &vp, NULL)) {
1530                         adios(EX_DATAERR, NULL, "Unable to encode %s header", DESCR_FIELD);
1531                 }
1532                 add_header(ct, np, vp);
1533         }
1534
1535         /*
1536         ** output the Content-Disposition
1537         */
1538         if (ct->c_dispo) {
1539                 np = getcpy(DISPO_FIELD);
1540                 vp = concat(" ", ct->c_dispo, NULL);
1541                 add_header(ct, np, vp);
1542         }
1543
1544         /*
1545         ** output the Content-Transfer-Encoding
1546         */
1547         switch (ct->c_encoding) {
1548         case CE_7BIT:
1549                 /* Nothing to output */
1550                 break;
1551
1552         case CE_8BIT:
1553                 if (ct->c_type == CT_MESSAGE)
1554                         adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1555
1556                 np = getcpy(ENCODING_FIELD);
1557                 vp = concat(" ", "8bit", "\n", NULL);
1558                 add_header(ct, np, vp);
1559                 break;
1560
1561         case CE_QUOTED:
1562                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1563                         adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1564
1565                 np = getcpy(ENCODING_FIELD);
1566                 vp = concat(" ", "quoted-printable", "\n", NULL);
1567                 add_header(ct, np, vp);
1568                 break;
1569
1570         case CE_BASE64:
1571                 if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART)
1572                         adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1573
1574                 np = getcpy(ENCODING_FIELD);
1575                 vp = concat(" ", "base64", "\n", NULL);
1576                 add_header(ct, np, vp);
1577                 break;
1578
1579         case CE_BINARY:
1580                 if (ct->c_type == CT_MESSAGE)
1581                         adios(EX_DATAERR, NULL, "internal error, invalid encoding");
1582
1583                 np = getcpy(ENCODING_FIELD);
1584                 vp = concat(" ", "binary", "\n", NULL);
1585                 add_header(ct, np, vp);
1586                 break;
1587
1588         default:
1589                 adios(EX_DATAERR, NULL, "unknown transfer encoding in content");
1590                 break;
1591         }
1592
1593         /*
1594         ** Additional content specific header processing
1595         */
1596         switch (ct->c_type) {
1597         case CT_MULTIPART:
1598         {
1599                 struct multipart *m;
1600                 struct part *part;
1601
1602                 m = (struct multipart *) ct->c_ctparams;
1603                 for (part = m->mp_parts; part; part = part->mp_next) {
1604                         CT p;
1605
1606                         p = part->mp_part;
1607                         build_headers(p);
1608                 }
1609         }
1610                 break;
1611
1612         default:
1613                 /* Nothing to do */
1614                 break;
1615         }
1616
1617         return OK;
1618 }