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         int compnum, state;
 316         char buf[BUFSIZ], name[NAMESZ];
 317         char *cp, *np, *vp;
 318         struct multipart *m;
 319         struct part **pp;
 320         CT ct;
 321         FILE *in;
 322
 323         umask(~m_gmprot());
 324
 325         /* open the composition draft */
 326         if ((in = fopen(infile, "r")) == NULL)
 327                 adios(EX_IOERR, infile, "unable to open for reading");
 328
 329         /*
 330         ** Allocate space for primary (outside) content
 331         */
 332         if ((ct = (CT) calloc(1, sizeof(*ct))) == NULL)
 333                 adios(EX_OSERR, NULL, "out of memory");
 334
 335         /*
 336         ** Allocate structure for handling decoded content
 337         ** for this part.  We don't really need this, but
 338         ** allocate it to remain consistent.
 339         */
 340         init_decoded_content(ct);
 341
 342         /*
 343         ** Parse some of the header fields in the composition
 344         ** draft into the linked list of header fields for
 345         ** the new MIME message.
 346         */
 347         for (compnum = 1, state = FLD;;) {
 348                 switch (state = m_getfld(state, name, buf, sizeof(buf), in)) {
 349                 case FLD:
 350                 case FLDPLUS:
 351                 case FLDEOF:
 352                         compnum++;
 353
 354                         /* abort if draft has Mime-Version header field */
 355                         if (!mh_strcasecmp(name, VRSN_FIELD))
 356                                 adios(EX_CONFIG, NULL, "draft shouldn't contain %s: field", VRSN_FIELD);
 357
 358                         /*
 359                         ** abort if draft has Content-Transfer-Encoding
 360                         ** header field
 361                         */
 362                         if (!mh_strcasecmp(name, ENCODING_FIELD))
 363                                 adios(EX_CONFIG, NULL, "draft shouldn't contain %s: field", ENCODING_FIELD);
 364
 365                         /* ignore any Content-Type fields in the header */
 366                         if (!mh_strcasecmp(name, TYPE_FIELD)) {
 367                                 while (state == FLDPLUS)
 368                                         state = m_getfld(state, name, buf,
 369                                                         sizeof(buf), in);
 370                                 goto finish_field;
 371                         }
 372
 373                         /* get copies of the buffers */
 374                         np = getcpy(name);
 375                         vp = getcpy(buf);
 376
 377                         /* if necessary, get rest of field */
 378                         while (state == FLDPLUS) {
 379                                 state = m_getfld(state, name, buf,
 380                                                 sizeof(buf), in);
 381                                 vp = add(buf, vp);  /* add to prev value */
 382                         }
 383
 384                         /* Now add the header data to the list */
 385                         add_header(ct, np, vp);
 386
 387 finish_field:
 388                         /* if this wasn't the last hdr field, then continue */
 389                         if (state != FLDEOF)
 390                                 continue;
 391                         /* else fall... */
 392
 393                 case FILEEOF:
 394                         adios(EX_CONFIG, NULL, "draft has empty body -- no directives!");
 395                         /* NOTREACHED */
 396
 397                 case BODY:
 398                 case BODYEOF:
 399                         fseek(in, (long) (-strlen(buf)), SEEK_CUR);
 400                         break;
 401
 402                 case LENERR:
 403                 case FMTERR:
 404                         adios(EX_CONFIG, NULL, "message format error in component #%d",
 405                                         compnum);
 406
 407                 default:
 408                         adios(EX_SOFTWARE, NULL, "getfld() returned %d", state);
 409                 }
 410                 break;
 411         }
 412
 413         /*
 414         ** Now add the MIME-Version header field
 415         ** to the list of header fields.
 416         */
 417         np = getcpy(VRSN_FIELD);
 418         vp = concat(" ", VRSN_VALUE, "\n", NULL);
 419         add_header(ct, np, vp);
 420
 421         /*
 422         ** We initally assume we will find multiple contents in the
 423         ** draft.  So create a multipart/mixed content to hold everything.
 424         ** We can remove this later, if it is not needed.
 425         */
 426         if (get_ctinfo("multipart/mixed", ct, 0) == NOTOK) {
 427                 exit(EX_DATAERR);
 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(EX_OSERR, 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(EX_OSERR, 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(EX_OSERR, 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(EX_SOFTWARE, 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(EX_SOFTWARE, 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(EX_OSERR, 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(EX_OSERR, 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(EX_CANTCREAT, "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(EX_DATAERR, 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(EX_DATAERR, 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(EX_DATAERR, 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(EX_DATAERR, 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                         exit(EX_DATAERR);
 716
 717                 for (s2i = str2cts; s2i->si_key; s2i++)
 718                         if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 719                                 break;
 720                 if (!s2i->si_key && !uprf(ci->ci_type, "X-"))
 721                         s2i++;
 722
 723                 /*
 724                 ** check type specified (possibly implicitly)
 725                 */
 726                 switch (ct->c_type = s2i->si_val) {
 727                 case CT_MESSAGE:
 728                         if (!mh_strcasecmp(ci->ci_subtype, "rfc822")) {
 729                                 ct->c_encoding = CE_7BIT;
 730                                 goto call_init;
 731                         }
 732                         /* else fall... */
 733                 case CT_MULTIPART:
 734                         adios(EX_DATAERR, NULL, "it doesn't make sense to define an in-line %s content",
 735                                         ct->c_type == CT_MESSAGE ? "message" :
 736                                         "multipart");
 737                         /* NOTREACHED */
 738
 739                 default:
 740 call_init:
 741                         if ((ct->c_ctinitfnx = s2i->si_init))
 742                                 (*ct->c_ctinitfnx) (ct);
 743                         break;
 744                 }
 745
 746                 if (cp)
 747                         fseek(in, pos, SEEK_SET);
 748                 return OK;
 749         }
 750
 751         /*
 752         ** If we've reached this point, the next line
 753         ** must be some type of explicit directive.
 754         */
 755
 756         if (buf[1] == '@') {
 757                 adios(EX_DATAERR, NULL, "The #@ directive i.e. message/external-body "
 758                                 "is not supported anymore.");
 759         }
 760
 761         /* parse directive */
 762         if (get_ctinfo(buf+1, ct, 1) == NOTOK)
 763                 exit(EX_DATAERR);
 764
 765         /* check directive against the list of MIME types */
 766         for (s2i = str2cts; s2i->si_key; s2i++)
 767                 if (!mh_strcasecmp(ci->ci_type, s2i->si_key))
 768                         break;
 769
 770         /*
 771         ** Check if the directive specified a valid type.
 772         ** This will happen if it was one of the following forms:
 773         **
 774         **    #type/subtype
 775         */
 776         if (s2i->si_key) {
 777                 if (!ci->ci_subtype)
 778                         adios(EX_DATAERR, NULL, "missing subtype in \"#%s\"", ci->ci_type);
 779
 780                 switch (ct->c_type = s2i->si_val) {
 781                 case CT_MULTIPART:
 782                         adios(EX_DATAERR, NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 783                         /* NOTREACHED */
 784
 785                 case CT_MESSAGE:
 786                         if (!mh_strcasecmp(ci->ci_subtype, "partial") ||
 787                                         !mh_strcasecmp(ci->ci_subtype,
 788                                         "external-body")) {
 789                                 adios(EX_DATAERR, NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype);
 790                         }
 791 use_forw:
 792                         admonish(NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype);
 793                         /* FALL */
 794
 795                 default:
 796                         if ((ct->c_ctinitfnx = s2i->si_init))
 797                                 (*ct->c_ctinitfnx) (ct);
 798                         break;
 799                 }
 800
 801                 /* Handle [file] argument */
 802                 if (ci->ci_magic) {
 803                         /* check if specifies command to execute */
 804                         if (*ci->ci_magic == '|' || *ci->ci_magic == '!') {
 805                                 for (cp = ci->ci_magic + 1; isspace(*cp); cp++)
 806                                         continue;
 807                                 if (!*cp)
 808                                         adios(EX_DATAERR, NULL, "empty pipe command for #%s directive", ci->ci_type);
 809                                 cp = getcpy(cp);
 810                                 free(ci->ci_magic);
 811                                 ci->ci_magic = cp;
 812                         } else {
 813                                 /* record filename of decoded contents */
 814                                 ce->ce_file = ci->ci_magic;
 815                                 if (access(ce->ce_file, R_OK) == NOTOK)
 816                                         adios(EX_IOERR, "reading", "unable to access %s for", ce->ce_file);
 817                                 ci->ci_magic = NULL;
 818                         }
 819                         return OK;
 820                 }
 821
 822                 /*
 823                 ** No [file] argument, so check profile for
 824                 ** method to compose content.
 825                 */
 826                 snprintf(buffer, sizeof(buffer), "%s-compose-%s/%s",
 827                                 invo_name, ci->ci_type, ci->ci_subtype);
 828                 if ((cp = context_find(buffer)) == NULL || *cp == '\0') {
 829                         snprintf(buffer, sizeof(buffer), "%s-compose-%s",
 830                                         invo_name, ci->ci_type);
 831                         if ((cp = context_find(buffer)) == NULL ||
 832                                         *cp == '\0') {
 833                                 content_error(NULL, ct, "don't know how to compose content");
 834                                 exit(EX_CONFIG);
 835                         }
 836                 }
 837                 ci->ci_magic = getcpy(cp);
 838                 return OK;
 839         }
 840
 841         /*
 842         ** Message directive
 843         ** #forw [+folder] [msgs]
 844         */
 845         if (!mh_strcasecmp(ci->ci_type, "forw")) {
 846                 int msgnum;
 847                 char *folder, *arguments[MAXARGS];
 848                 struct msgs *mp;
 849
 850                 if (ci->ci_magic) {
 851                         int i;
 852
 853                         ap = brkstring(ci->ci_magic, " ", "\n");
 854                         for (i=0; ap[i] && i<MAXARGS-1; i++) {
 855                                 arguments[i] = ap[i];
 856                         }
 857                         arguments[i] = NULL;
 858
 859                 } else {
 860                         arguments[0] = seq_cur;
 861                         arguments[1] = NULL;
 862                 }
 863                 folder = NULL;
 864
 865                 /* search the arguments for a folder name */
 866                 for (ap = arguments; *ap; ap++) {
 867                         cp = *ap;
 868                         if (*cp == '+' || *cp == '@') {
 869                                 if (folder)
 870                                         adios(EX_USAGE, NULL, "only one folder per #forw directive");
 871                                 else
 872                                         folder = getcpy(expandfol(cp));
 873                         }
 874                 }
 875
 876                 /* else, use the current folder */
 877                 if (!folder)
 878                         folder = getcpy(getcurfol());
 879
 880                 if (!(mp = folder_read(folder)))
 881                         adios(EX_IOERR, NULL, "unable to read folder %s", folder);
 882                 for (ap = arguments; *ap; ap++) {
 883                         cp = *ap;
 884                         if (*cp != '+' && *cp != '@')
 885                                 if (!m_convert(mp, cp))
 886                                         exit(EX_USAGE);
 887                 }
 888                 free(folder);
 889                 free_ctinfo(ct);
 890
 891                 /*
 892                 ** If there is more than one message to include, make this
 893                 ** a content of type "multipart/digest" and insert each message
 894                 ** as a subpart.  If there is only one message, then make this
 895                 ** a content of type "message/rfc822".
 896                 */
 897                 if (mp->numsel > 1) {
 898                         /* we are forwarding multiple messages */
 899                         if (get_ctinfo("multipart/digest", ct, 0) == NOTOK)
 900                                 exit(EX_DATAERR);
 901                         ct->c_type = CT_MULTIPART;
 902                         ct->c_subtype = MULTI_DIGEST;
 903
 904                         if ((m = (struct multipart *)
 905                                         calloc(1, sizeof(*m))) == NULL)
 906                                 adios(EX_OSERR, NULL, "out of memory");
 907                         ct->c_ctparams = (void *) m;
 908                         pp = &m->mp_parts;
 909
 910                         for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) {
 911                                 if (is_selected(mp, msgnum)) {
 912                                         struct part *part;
 913                                         CT p;
 914                                         CE pe;
 915
 916                                         if ((p = (CT) calloc(1, sizeof(*p)))
 917                                                         == NULL)
 918                                                 adios(EX_OSERR, NULL, "out of memory");
 919                                         init_decoded_content(p);
 920                                         pe = p->c_cefile;
 921                                         if (get_ctinfo("message/rfc822", p, 0)
 922                                                         == NOTOK)
 923                                                 exit(EX_DATAERR);
 924                                         p->c_type = CT_MESSAGE;
 925                                         p->c_subtype = MESSAGE_RFC822;
 926
 927                                         snprintf(buffer, sizeof(buffer),
 928                                                         "%s/%d", mp->foldpath,
 929                                                         msgnum);
 930                                         pe->ce_file = getcpy(buffer);
 931
 932                                         if ((part = (struct part *) calloc(1, sizeof(*part))) == NULL)
 933                                                 adios(EX_OSERR, NULL, "out of memory");
 934                                         *pp = part;
 935                                         pp = &part->mp_next;
 936                                         part->mp_part = p;
 937                                 }
 938                         }
 939                 } else {
 940                         /* we are forwarding one message */
 941                         if (get_ctinfo("message/rfc822", ct, 0) == NOTOK)
 942                                 exit(EX_DATAERR);
 943                         ct->c_type = CT_MESSAGE;
 944                         ct->c_subtype = MESSAGE_RFC822;
 945
 946                         msgnum = mp->lowsel;
 947                         snprintf(buffer, sizeof(buffer), "%s/%d",
 948                                         mp->foldpath, msgnum);
 949                         ce->ce_file = getcpy(buffer);
 950                 }
 951
 952                 folder_free(mp);  /* free folder/message structure */
 953                 return OK;
 954         }
 955
 956         /*
 957         ** #end
 958         */
 959         if (!mh_strcasecmp(ci->ci_type, "end")) {
 960                 free_content(ct);
 961                 *ctp = NULL;
 962                 return DONE;
 963         }
 964
 965         /*
 966         ** #begin [ alternative | parallel ]
 967         */
 968         if (!mh_strcasecmp(ci->ci_type, "begin")) {
 969                 if (!ci->ci_magic) {
 970                         vrsn = MULTI_MIXED;
 971                         cp = SubMultiPart[vrsn - 1].kv_key;
 972                 } else if (!mh_strcasecmp(ci->ci_magic, "alternative")) {
 973                         vrsn = MULTI_ALTERNATE;
 974                         cp = SubMultiPart[vrsn - 1].kv_key;
 975                 } else if (!mh_strcasecmp(ci->ci_magic, "parallel")) {
 976                         vrsn = MULTI_PARALLEL;
 977                         cp = SubMultiPart[vrsn - 1].kv_key;
 978                 } else if (uprf(ci->ci_magic, "digest")) {
 979                         goto use_forw;
 980                 } else {
 981                         vrsn = MULTI_UNKNOWN;
 982                         cp = ci->ci_magic;
 983                 }
 984
 985                 free_ctinfo(ct);
 986                 snprintf(buffer, sizeof(buffer), "multipart/%s", cp);
 987                 if (get_ctinfo(buffer, ct, 0) == NOTOK)
 988                         exit(EX_DATAERR);
 989                 ct->c_type = CT_MULTIPART;
 990                 ct->c_subtype = vrsn;
 991
 992                 if ((m = (struct multipart *) calloc(1, sizeof(*m))) == NULL)
 993                         adios(EX_OSERR, NULL, "out of memory");
 994                 ct->c_ctparams = (void *) m;
 995
 996                 pp = &m->mp_parts;
 997                 while (fgetstr(buffer, sizeof(buffer) - 1, in)) {
 998                         struct part *part;
 999                         CT p;
1000
1001                         if (user_content(in, file, buffer, &p) == DONE) {
1002                                 if (!m->mp_parts)
1003                                         adios(EX_DATAERR, NULL, "empty \"#begin ... #end\" sequence");
1004                                 return OK;
1005                         }
1006                         if (!p)
1007                                 continue;
1008
1009                         if ((part = (struct part *)
1010                                         calloc(1, sizeof(*part))) == NULL)
1011                                 adios(EX_OSERR, NULL, "out of memory");
1012                         *pp = part;
1013                         pp = &part->mp_next;
1014                         part->mp_part = p;
1015                 }
1016                 admonish(NULL, "premature end-of-file, missing #end");
1017                 return OK;
1018         }
1019
1020         /*
1021         ** Unknown directive
1022         */
1023         adios(EX_DATAERR, NULL, "unknown directive \"#%s\"", ci->ci_type);
1024         return NOTOK;  /* NOT REACHED */
1025 }
1026
1027
1028 static void
1029 set_id(CT ct, int top)
1030 {
1031         char msgid[BUFSIZ];
1032         static int partno;
1033         static time_t clock = 0;
1034         static char *msgfmt;
1035
1036         if (clock == 0) {
1037                 time(&clock);
1038                 snprintf(msgid, sizeof(msgid), "<%d.%ld.%%d@%s>\n",
1039                                 (int) getpid(), (long) clock, LocalName());
1040                 partno = 0;
1041                 msgfmt = getcpy(msgid);
1042         }
1043         snprintf(msgid, sizeof(msgid), msgfmt, top ? 0 : ++partno);
1044         ct->c_id = getcpy(msgid);
1045 }
1046
1047
1048 /*
1049 ** Fill out, or expand the various contents in the composition
1050 ** draft.  Read-in any necessary files.  Parse and execute any
1051 ** commands specified by profile composition strings.
1052 */
1053
1054 static int
1055 compose_content(CT ct)
1056 {
1057         CE ce = ct->c_cefile;
1058
1059         switch (ct->c_type) {
1060         case CT_MULTIPART:
1061         {
1062                 int partnum;
1063                 char *pp;
1064                 char partnam[BUFSIZ];
1065                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1066                 struct part *part;
1067
1068                 if (ct->c_partno) {
1069                         snprintf(partnam, sizeof(partnam), "%s.",
1070                                         ct->c_partno);
1071                         pp = partnam + strlen(partnam);
1072                 } else {
1073                         pp = partnam;
1074                 }
1075
1076                 /* first, we call compose_content on all the subparts */
1077                 for (part = m->mp_parts, partnum = 1; part;
1078                                 part = part->mp_next, partnum++) {
1079                         CT p = part->mp_part;
1080
1081                         sprintf(pp, "%d", partnum);
1082                         p->c_partno = getcpy(partnam);
1083                         if (compose_content(p) == NOTOK)
1084                                 return NOTOK;
1085                 }
1086         }
1087         break;
1088
1089         case CT_MESSAGE:
1090                 /* Nothing to do for type message */
1091                 break;
1092
1093         /*
1094         ** Discrete types (text/application/audio/image/video)
1095         */
1096         default:
1097                 if (!ce->ce_file) {
1098                         pid_t child_id;
1099                         int xstdout, len, buflen;
1100                         char *bp, **ap, *cp;
1101                         char *vec[4], buffer[BUFSIZ];
1102                         FILE *out;
1103                         CI ci = &ct->c_ctinfo;
1104                         char *tfile = NULL;
1105
1106                         if (!(cp = ci->ci_magic))
1107                                 adios(EX_SOFTWARE, NULL, "internal error(5)");
1108
1109                         tfile = m_mktemp2(NULL, invo_name, NULL, NULL);
1110                         if (tfile == NULL) {
1111                                 adios(EX_CANTCREAT, "mhbuild", "unable to create temporary file");
1112                         }
1113                         ce->ce_file = getcpy(tfile);
1114                         ce->ce_unlink = 1;
1115
1116                         xstdout = 0;
1117
1118                         /* Get buffer ready to go */
1119                         bp = buffer;
1120                         bp[0] = '\0';
1121                         buflen = sizeof(buffer);
1122
1123                         /*
1124                         ** Parse composition string into buffer
1125                         */
1126                         for ( ; *cp; cp++) {
1127                                 if (*cp == '%') {
1128                                         switch (*++cp) {
1129                                         case 'a':
1130                                         {
1131                                                 /*
1132                                                 ** insert parameters from
1133                                                 ** directive
1134                                                 */
1135                                                 char **ep;
1136                                                 char *s = "";
1137
1138                                                 for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1139                                                         snprintf(bp, buflen, "%s%s=\"%s\"", s, *ap, *ep);
1140                                                         len = strlen(bp);
1141                                                         bp += len;
1142                                                         buflen -= len;
1143                                                         s = " ";
1144                                                 }
1145                                         }
1146                                         break;
1147
1148                                         case 'F':
1149                                                 /* %f, and stdout is not-redirected */
1150                                                 xstdout = 1;
1151                                                 /* and fall... */
1152
1153                                         case 'f':
1154                                                 /*
1155                                                 ** insert temporary filename
1156                                                 ** where content should be
1157                                                 ** written
1158                                                 */
1159                                                 snprintf(bp, buflen, "%s", ce->ce_file);
1160                                                 break;
1161
1162                                         case 's':
1163                                                 /* insert content subtype */
1164                                                 strncpy(bp, ci->ci_subtype, buflen);
1165                                                 break;
1166
1167                                         case '%':
1168                                                 /* insert character % */
1169                                                 goto raw;
1170
1171                                         default:
1172                                                 *bp++ = *--cp;
1173                                                 *bp = '\0';
1174                                                 buflen--;
1175                                                 continue;
1176                                         }
1177                                         len = strlen(bp);
1178                                         bp += len;
1179                                         buflen -= len;
1180                                 } else {
1181 raw:
1182                                         *bp++ = *cp;
1183                                         *bp = '\0';
1184                                         buflen--;
1185                                 }
1186                         }
1187
1188                         if (verbosw)
1189                                 printf("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer);
1190
1191                         fflush(stdout);  /* not sure if need for -noverbose */
1192
1193                         vec[0] = "/bin/sh";
1194                         vec[1] = "-c";
1195                         vec[2] = buffer;
1196                         vec[3] = NULL;
1197
1198                         if ((out = fopen(ce->ce_file, "w")) == NULL)
1199                                 adios(EX_IOERR, ce->ce_file, "unable to open for writing");
1200
1201                         switch (child_id = fork()) {
1202                         case NOTOK:
1203                                 adios(EX_OSERR, "fork", "unable to fork");
1204                                 /* NOTREACHED */
1205
1206                         case OK:
1207                                 if (!xstdout)
1208                                         dup2(fileno(out), 1);
1209                                 close(fileno(out));
1210                                 execvp("/bin/sh", vec);
1211                                 fprintf(stderr, "unable to exec ");
1212                                 perror("/bin/sh");
1213                                 _exit(EX_OSERR);
1214                                 /* NOTREACHED */
1215
1216                         default:
1217                                 fclose(out);
1218                                 if (pidXwait(child_id, NULL))
1219                                         exit(EX_SOFTWARE);
1220                                 break;
1221                         }
1222                 }
1223                 break;
1224         }
1225
1226         return OK;
1227 }
1228
1229
1230 /*
1231 ** Scan the content.
1232 **
1233 **    1) choose a transfer encoding.
1234 **    2) check for clashes with multipart boundary string.
1235 **    3) for text content, figure out which character set is being used.
1236 **
1237 ** If there is a clash with one of the contents and the multipart boundary,
1238 ** this function will exit with NOTOK.  This will cause the scanning process
1239 ** to be repeated with a different multipart boundary.  It is possible
1240 ** (although highly unlikely) that this scan will be repeated multiple times.
1241 */
1242
1243 static int
1244 scan_content(CT ct)
1245 {
1246         int len;
1247         int check8bit = 0, contains8bit = 0;
1248         int checklinelen = 0, linelen = 0;
1249         int checkboundary = 0, boundaryclash = 0;
1250         int checklinespace = 0, linespace = 0;  /* trailing whitespace */
1251         unsigned char *cp = NULL, buffer[BUFSIZ];
1252         struct text *t = NULL;
1253         FILE *in = NULL;
1254         CE ce = ct->c_cefile;
1255
1256         /*
1257         ** handle multipart by scanning all subparts
1258         ** and then checking their encoding.
1259         */
1260         if (ct->c_type == CT_MULTIPART) {
1261                 struct multipart *m = (struct multipart *) ct->c_ctparams;
1262                 struct part *part;
1263
1264                 /* initially mark the domain of enclosing multipart as 7bit */
1265                 ct->c_encoding = CE_7BIT;
1266
1267                 for (part = m->mp_parts; part; part = part->mp_next) {
1268                         CT p = part->mp_part;
1269
1270                         if (scan_content(p) == NOTOK) {
1271                                 /* choose encoding for subpart */
1272                                 return NOTOK;
1273                         }
1274
1275                         /*
1276                         ** if necessary, enlarge encoding for enclosing
1277                         ** multipart
1278                         */
1279                         if (p->c_encoding == CE_BINARY)
1280                                 ct->c_encoding = CE_BINARY;
1281                         if (p->c_encoding == CE_8BIT &&
1282                                         ct->c_encoding != CE_BINARY)
1283                                 ct->c_encoding = CE_8BIT;
1284                 }
1285
1286                 return OK;
1287         }
1288
1289         /*
1290         ** Decide what to check while scanning this content.
1291         */
1292         switch (ct->c_type) {
1293         case CT_TEXT:
1294                 check8bit = 1;
1295                 checkboundary = 1;
1296                 if (ct->c_subtype == TEXT_PLAIN) {
1297                         checklinelen = 0;
1298                         checklinespace = 0;
1299                 } else {
1300                         checklinelen = 1;
1301                         checklinespace = 1;
1302                 }
1303                 break;
1304
1305         case CT_MESSAGE:
1306                 check8bit = 0;
1307                 checklinelen = 0;
1308                 checklinespace = 0;
1309                 checkboundary = 1;
1310                 break;
1311
1312         case CT_APPLICATION:
1313         case CT_AUDIO:
1314         case CT_IMAGE:
1315         case CT_VIDEO:
1316                 check8bit = 0;
1317                 checklinelen = 0;
1318                 checklinespace = 0;
1319                 checkboundary = 0;
1320                 break;
1321         }
1322
1323         /*
1324         ** Scan the unencoded content
1325         */
1326         if (check8bit || checklinelen || checklinespace || checkboundary) {
1327                 if ((in = fopen(ce->ce_file, "r")) == NULL)
1328                         adios(EX_IOERR, ce->ce_file, "unable to open for reading");
1329                 len = strlen(prefix);
1330
1331                 while (fgets(buffer, sizeof(buffer) - 1, in)) {
1332                         if (check8bit) {
1333                                 for (cp = buffer; *cp; cp++) {
1334                                         if (!isascii(*cp)) {
1335                                                 contains8bit = 1;
1336                                                 /* no need to keep checking */
1337                                                 check8bit = 0;
1338                                         }
1339                                 }
1340                         }
1341
1342                         if (checklinelen && (strlen(buffer) > CPERLIN + 1)) {
1343                                 linelen = 1;
1344                                 checklinelen = 0;  /* no need to keep checking */
1345                         }
1346
1347                         if (checklinespace &&
1348                                         (cp = buffer + strlen(buffer) - 2) >
1349                                         buffer && isspace(*cp)) {
1350                                 linespace = 1;
1351                                 /* no need to keep checking */
1352                                 checklinespace = 0;
1353                         }
1354
1355                         /*
1356                         ** Check if content contains a line that clashes
1357                         ** with our standard boundary for multipart messages.
1358                         */
1359                         if (checkboundary && buffer[0] == '-' &&
1360                                         buffer[1] == '-') {
1361                                 for (cp = buffer + strlen(buffer) - 1;
1362                                                 cp >= buffer; cp--)
1363                                         if (!isspace(*cp))
1364                                                 break;
1365                                 *++cp = '\0';
1366                                 if (strncmp(buffer + 2, prefix, len)==0 &&
1367                                                 isdigit(buffer[2 + len])) {
1368                                         boundaryclash = 1;
1369                                         /* no need to keep checking */
1370                                         checkboundary = 0;
1371                                 }
1372                         }
1373                 }
1374                 fclose(in);
1375         }
1376
1377         /*
1378         ** Decide which transfer encoding to use.
1379         */
1380         switch (ct->c_type) {
1381         case CT_TEXT:
1382                 /*
1383                 ** If the text content didn't specify a character
1384                 ** set, we need to figure out which one was used.
1385                 */
1386                 t = (struct text *) ct->c_ctparams;
1387                 if (t->tx_charset == CHARSET_UNSPECIFIED) {
1388                         CI ci = &ct->c_ctinfo;
1389                         char **ap, **ep;
1390
1391                         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++)
1392                                 continue;
1393
1394                         if (contains8bit) {
1395                                 t->tx_charset = CHARSET_UNKNOWN;
1396                                 *ap = concat("charset=", write_charset_8bit(),
1397                                                 NULL);
1398                         } else {
1399                                 t->tx_charset = CHARSET_USASCII;
1400                                 *ap = getcpy("charset=us-ascii");
1401                         }
1402
1403                         cp = strchr(*ap++, '=');
1404                         *ap = NULL;
1405                         *cp++ = '\0';
1406                         *ep = cp;
1407                 }
1408
1409                 if (contains8bit || linelen || linespace)
1410                         ct->c_encoding = CE_QUOTED;
1411                 else
1412                         ct->c_encoding = CE_7BIT;
1413                 break;
1414
1415         case CT_MESSAGE:
1416                 ct->c_encoding = CE_7BIT;
1417                 break;
1418
1419         case CT_APPLICATION:
1420         case CT_AUDIO:
1421         case CT_IMAGE:
1422         case CT_VIDEO:
1423                 /*
1424                 ** Forcing use of base64, because these types likely
1425                 ** contain binary data and NUL bytes. Don't care about
1426                 ** files that would be clean.
1427                 */
1428                 ct->c_encoding = CE_BASE64;
1429                 break;
1430         }
1431
1432         return (boundaryclash ? NOTOK : OK);
1433 }
1434
1435
1436 /*
1437 ** Scan the content structures, and build header
1438 ** fields that will need to be output into the
1439 ** message.
1440 */
1441
1442 static int
1443 build_headers(CT ct)
1444 {
1445         int cc, len;
1446         char **ap, **ep;
1447         char *np, *vp, buffer[BUFSIZ];
1448         CI ci = &ct->c_ctinfo;
1449
1450         /*
1451         ** If message is type multipart, then add the multipart
1452         ** boundary to the list of attribute/value pairs.
1453         */
1454         if (ct->c_type == CT_MULTIPART) {
1455                 char *cp;
1456                 static int level = 0;  /* store nesting level */
1457
1458                 ap = ci->ci_attrs;
1459                 ep = ci->ci_values;
1460                 snprintf(buffer, sizeof(buffer), "boundary=%s%d",
1461                                 prefix, level++);
1462                 cp = strchr(*ap++ = getcpy(buffer), '=');
1463                 *ap = NULL;
1464                 *cp++ = '\0';
1465                 *ep = cp;
1466         }
1467
1468         /*
1469         ** output the content type and subtype
1470         */
1471         np = getcpy(TYPE_FIELD);
1472         vp = concat(" ", ci->ci_type, "/", ci->ci_subtype, NULL);
1473
1474         /* keep track of length of line */
1475         len = strlen(TYPE_FIELD) + strlen(ci->ci_type) +
1476                         strlen(ci->ci_subtype) + 3;
1477
1478         /*
1479         ** Append the attribute/value pairs to
1480         ** the end of the Content-Type line.
1481         */
1482         for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) {
1483                 vp = add(";", vp);
1484                 len++;
1485
1486                 snprintf(buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep);
1487                 if (len + 1 + (cc = strlen(buffer)) >= CPERLIN) {
1488                         vp = add("\n\t", vp);
1489                         len = 8;
1490                 } else {
1491                         vp = add(" ", vp);
1492                         len++;
1493                 }
1494                 vp = add(buffer, vp);
1495                 len += cc;
1496         }
1497
1498         /*
1499         ** Append any RFC-822 comment to the end of
1500         ** the Content-Type line.
1501         */
1502         if (ci->ci_comment) {
1503                 snprintf(buffer, sizeof(buffer), "(%s)", ci->ci_comment);
1504                 if (len + 1 + (cc = 2 + strlen(ci->ci_comment)) >= CPERLIN) {
1505                         vp = add("\n\t", vp);
1506                         len = 8;
1507                 } else {
1508                         vp = add(" ", vp);
1509                         len++;
1510                 }
1511                 vp = add(buffer, vp);
1512                 len += cc;
1513         }
1514         vp = add("\n", vp);
1515         add_header(ct, np, vp);
1516
1517         /*
1518         ** output the Content-ID
1519         */
1520         if (ct->c_id) {
1521                 np = getcpy(ID_FIELD);
1522                 vp = concat(" ", ct->c_id, NULL);
1523                 add_header(ct, np, vp);
1524         }
1525
1526         /*
1527         ** output the Content-Description
1528         */
1529         if (ct->c_descr) {
1530                 np = getcpy(DESCR_FIELD);
1531                 vp = concat(" ", ct->c_descr, NULL);
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 }