src/procheader.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2014 Hiroyuki Yamamoto and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include <glib.h>
  26 #include <glib/gi18n.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <time.h>
  31 #include <sys/stat.h>
  32
  33 #ifdef G_OS_WIN32
  34 #  include <w32lib.h>
  35 #endif
  36
  37 #include "procheader.h"
  38 #include "procmsg.h"
  39 #include "codeconv.h"
  40 #include "prefs_common.h"
  41 #include "hooks.h"
  42 #include "utils.h"
  43 #include "defs.h"
  44 #include "file-utils.h"
  45
  46 #define BUFFSIZE        8192
  47
  48 static gchar monthstr[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
  49
  50 typedef char *(*getlinefunc) (char *, size_t, void *);
  51 typedef int (*peekcharfunc) (void *);
  52 typedef int (*getcharfunc) (void *);
  53 typedef gint (*get_one_field_func) (gchar **, void *, HeaderEntry[]);
  54
  55 static gint string_get_one_field(gchar **buf, char **str,
  56                                  HeaderEntry hentry[]);
  57
  58 static char *string_getline(char *buf, size_t len, char **str);
  59 static int string_peekchar(char **str);
  60 static int file_peekchar(FILE *fp);
  61 static gint generic_get_one_field(gchar **bufptr, void *data,
  62                                   HeaderEntry hentry[],
  63                                   getlinefunc getline,
  64                                   peekcharfunc peekchar,
  65                                   gboolean unfold);
  66 static MsgInfo *parse_stream(void *data, gboolean isstring, MsgFlags flags,
  67                              gboolean full, gboolean decrypted);
  68
  69
  70 gint procheader_get_one_field(gchar **buf, FILE *fp,
  71                               HeaderEntry hentry[])
  72 {
  73         return generic_get_one_field(buf, fp, hentry,
  74                                      (getlinefunc)fgets_crlf, (peekcharfunc)file_peekchar,
  75                                      TRUE);
  76 }
  77
  78 static gint string_get_one_field(gchar **buf, char **str,
  79                                  HeaderEntry hentry[])
  80 {
  81         return generic_get_one_field(buf, str, hentry,
  82                                      (getlinefunc)string_getline,
  83                                      (peekcharfunc)string_peekchar,
  84                                      TRUE);
  85 }
  86
  87 gboolean procheader_skip_headers(FILE *fp)
  88 {
  89         gchar *buf = g_malloc(BUFFSIZE);
  90         do {
  91                 if (fgets_crlf(buf, BUFFSIZE - 1, fp) == NULL) {
  92                         g_free(buf);
  93                         return FALSE;
  94                 }
  95                 if (buf[0] == '\r' || buf[0] == '\n') {
  96                         break;
  97                 }
  98         } while (TRUE);
  99         g_free(buf);
 100
 101         return TRUE;
 102 }
 103
 104
 105 static char *string_getline(char *buf, size_t len, char **str)
 106 {
 107         gboolean is_cr = FALSE;
 108         gboolean last_was_cr = FALSE;
 109
 110         if (!*str || !**str)
 111                 return NULL;
 112
 113         for (; **str && len > 1; --len) {
 114                 is_cr = (**str == '\r');
 115                 if ((*buf++ = *(*str)++) == '\n') {
 116                     break;
 117                 }
 118                 if (last_was_cr) {
 119                         *(--buf) = '\n';
 120                         buf++;
 121                     break;
 122                 }
 123                 last_was_cr = is_cr;
 124         }
 125
 126         *buf = '\0';
 127
 128         return buf;
 129 }
 130
 131 static int string_peekchar(char **str)
 132 {
 133         return **str;
 134 }
 135
 136 static int file_peekchar(FILE *fp)
 137 {
 138         return ungetc(getc(fp), fp);
 139 }
 140
 141 static gint generic_get_one_field(gchar **bufptr, void *data,
 142                           HeaderEntry *hentry,
 143                           getlinefunc getline, peekcharfunc peekchar,
 144                           gboolean unfold)
 145 {
 146         /* returns -1 in case of failure of any kind, whatever it's a parsing error
 147            or an allocation error. if returns -1, *bufptr is always NULL, and vice-versa,
 148            and if returning 0 (OK), *bufptr is always non-NULL, so callers just have to
 149            test the return value
 150         */
 151         gint nexthead;
 152         gint hnum = 0;
 153         HeaderEntry *hp = NULL;
 154         size_t len;
 155         gchar *buf;
 156
 157         cm_return_val_if_fail(bufptr != NULL, -1);
 158
 159         len = BUFFSIZE;
 160         buf = g_malloc(len);
 161
 162         if (hentry != NULL) {
 163                 /* skip non-required headers */
 164                 /* and get hentry header line */
 165                 do {
 166                         do {
 167                                 if (getline(buf, len, data) == NULL) {
 168                                         debug_print("generic_get_one_field: getline\n");
 169                                         g_free(buf);
 170                                         *bufptr = NULL;
 171                                         return -1;
 172                                 }
 173                                 if (buf[0] == '\r' || buf[0] == '\n') {
 174                                         debug_print("generic_get_one_field: empty line\n");
 175                                         g_free(buf);
 176                                         *bufptr = NULL;
 177                                         return -1;
 178                                 }
 179                         } while (buf[0] == ' ' || buf[0] == '\t');
 180
 181                         for (hp = hentry, hnum = 0; hp->name != NULL;
 182                              hp++, hnum++) {
 183                                 if (!g_ascii_strncasecmp(hp->name, buf,
 184                                                  strlen(hp->name)))
 185                                         break;
 186                         }
 187                 } while (hp->name == NULL);
 188         } else {
 189                 /* read first line */
 190                 if (getline(buf, len, data) == NULL) {
 191                         debug_print("generic_get_one_field: getline\n");
 192                         g_free(buf);
 193                         *bufptr = NULL;
 194                         return -1;
 195                 }
 196                 if (buf[0] == '\r' || buf[0] == '\n') {
 197                         debug_print("generic_get_one_field: empty line\n");
 198                         g_free(buf);
 199                         *bufptr = NULL;
 200                         return -1;
 201                 }
 202         }
 203         /* reduce initial buffer to its useful part */
 204         len = strlen(buf)+1;
 205         buf = g_realloc(buf, len);
 206         if (buf == NULL) {
 207                 debug_print("generic_get_one_field: reallocation error\n");
 208                 *bufptr = NULL;
 209                 return -1;
 210         }
 211
 212         /* unfold line */
 213         while (1) {
 214                 nexthead = peekchar(data);
 215                 /* ([*WSP CRLF] 1*WSP) */
 216                 if (nexthead == ' ' || nexthead == '\t') {
 217                         size_t buflen;
 218                         gchar *tmpbuf;
 219                         size_t tmplen;
 220
 221                         gboolean skiptab = (nexthead == '\t');
 222                         /* trim previous trailing \n if requesting one header or
 223                          * unfolding was requested */
 224                         if ((!hentry && unfold) || (hp && hp->unfold))
 225                                 strretchomp(buf);
 226
 227                         buflen = strlen(buf);
 228
 229                         /* read next line */
 230                         tmpbuf = g_malloc(BUFFSIZE);
 231
 232                         if (getline(tmpbuf, BUFFSIZE, data) == NULL) {
 233                                 g_free(tmpbuf);
 234                                 break;
 235                         }
 236                         tmplen = strlen(tmpbuf)+1;
 237
 238                         /* extend initial buffer and concatenate next line */
 239                         len += tmplen;
 240                         buf = g_realloc(buf, len);
 241                         if (buf == NULL) {
 242                                 debug_print("generic_get_one_field: reallocation error\n");
 243                                 g_free(buf);
 244                                 *bufptr = NULL;
 245                                 return -1;
 246                         }
 247                         memcpy(buf+buflen, tmpbuf, tmplen);
 248                         g_free(tmpbuf);
 249                         if (skiptab) { /* replace tab with space */
 250                                 *(buf + buflen) = ' ';
 251                         }
 252                 } else {
 253                         /* remove trailing new line */
 254                         strretchomp(buf);
 255                         break;
 256                 }
 257         }
 258
 259         *bufptr = buf;
 260
 261         return hnum;
 262 }
 263
 264 gint procheader_get_one_field_asis(gchar **buf, FILE *fp)
 265 {
 266         return generic_get_one_field(buf, fp, NULL,
 267                                      (getlinefunc)fgets_crlf,
 268                                      (peekcharfunc)file_peekchar,
 269                                      FALSE);
 270 }
 271
 272 GPtrArray *procheader_get_header_array_asis(FILE *fp)
 273 {
 274         gchar *buf = NULL;
 275         GPtrArray *headers;
 276         Header *header;
 277
 278         cm_return_val_if_fail(fp != NULL, NULL);
 279
 280         headers = g_ptr_array_new();
 281
 282         while (procheader_get_one_field_asis(&buf, fp) != -1) {
 283                 if ((header = procheader_parse_header(buf)) != NULL)
 284                         g_ptr_array_add(headers, header);
 285                 g_free(buf);
 286                 buf = NULL;
 287         }
 288
 289         return headers;
 290 }
 291
 292 void procheader_header_array_destroy(GPtrArray *harray)
 293 {
 294         gint i;
 295         Header *header;
 296
 297         cm_return_if_fail(harray != NULL);
 298
 299         for (i = 0; i < harray->len; i++) {
 300                 header = g_ptr_array_index(harray, i);
 301                 procheader_header_free(header);
 302         }
 303
 304         g_ptr_array_free(harray, TRUE);
 305 }
 306
 307 void procheader_header_free(Header *header)
 308 {
 309         if (!header) return;
 310
 311         g_free(header->name);
 312         g_free(header->body);
 313         g_free(header);
 314 }
 315
 316 /*
 317   tests whether two headers' names are equal
 318   remove the trailing ':' or ' ' before comparing
 319 */
 320
 321 gboolean procheader_headername_equal(char * hdr1, char * hdr2)
 322 {
 323         int len1;
 324         int len2;
 325
 326         len1 = strlen(hdr1);
 327         len2 = strlen(hdr2);
 328         if (hdr1[len1 - 1] == ':')
 329                 len1--;
 330         if (hdr2[len2 - 1] == ':')
 331                 len2--;
 332         if (len1 != len2)
 333                 return 0;
 334
 335         return (g_ascii_strncasecmp(hdr1, hdr2, len1) == 0);
 336 }
 337
 338 /*
 339   parse headers, for example :
 340   From: dinh@enseirb.fr becomes :
 341   header->name = "From:"
 342   header->body = "dinh@enseirb.fr"
 343  */
 344 static gboolean header_is_addr_field(const gchar *hdr)
 345 {
 346         static char *addr_headers[] = {
 347                                 "To:",
 348                                 "Cc:",
 349                                 "Bcc:",
 350                                 "From:",
 351                                 "Reply-To:",
 352                                 "Followup-To:",
 353                                 "Followup-and-Reply-To:",
 354                                 "Disposition-Notification-To:",
 355                                 "Return-Receipt-To:",
 356                                 NULL};
 357         int i;
 358
 359         if (!hdr)
 360                 return FALSE;
 361
 362         for (i = 0; addr_headers[i] != NULL; i++)
 363                 if (!strcasecmp(hdr, addr_headers[i]))
 364                         return FALSE;
 365
 366         return FALSE;
 367 }
 368
 369 Header * procheader_parse_header(gchar * buf)
 370 {
 371         gchar *p;
 372         Header * header;
 373         gboolean addr_field = FALSE;
 374
 375         cm_return_val_if_fail(buf != NULL, NULL);
 376
 377         if ((*buf == ':') || (*buf == ' '))
 378                 return NULL;
 379
 380         for (p = buf; *p ; p++) {
 381                 if ((*p == ':') || (*p == ' ')) {
 382                         header = g_new(Header, 1);
 383                         header->name = g_strndup(buf, p - buf + 1);
 384                         addr_field = header_is_addr_field(header->name);
 385                         p++;
 386                         while (*p == ' ' || *p == '\t') p++;
 387                         header->body = conv_unmime_header(p, NULL, addr_field);
 388                         return header;
 389                 }
 390         }
 391         return NULL;
 392 }
 393
 394 void procheader_get_header_fields(FILE *fp, HeaderEntry hentry[])
 395 {
 396         gchar *buf = NULL;
 397         HeaderEntry *hp;
 398         gint hnum;
 399         gchar *p;
 400
 401         if (hentry == NULL) return;
 402
 403         while ((hnum = procheader_get_one_field(&buf, fp, hentry)) != -1) {
 404                 hp = hentry + hnum;
 405
 406                 p = buf + strlen(hp->name);
 407                 while (*p == ' ' || *p == '\t') p++;
 408
 409                 if (hp->body == NULL)
 410                         hp->body = g_strdup(p);
 411                 else if (procheader_headername_equal(hp->name, "To") ||
 412                          procheader_headername_equal(hp->name, "Cc")) {
 413                         gchar *tp = hp->body;
 414                         hp->body = g_strconcat(tp, ", ", p, NULL);
 415                         g_free(tp);
 416                 }
 417                 g_free(buf);
 418                 buf = NULL;
 419         }
 420 }
 421
 422 MsgInfo *procheader_parse_file(const gchar *file, MsgFlags flags,
 423                                gboolean full, gboolean decrypted)
 424 {
 425 #ifdef G_OS_WIN32
 426         GFile *f;
 427         GFileInfo *fi;
 428         GTimeVal tv;
 429         GError *error = NULL;
 430 #else
 431         GStatBuf s;
 432 #endif
 433         FILE *fp;
 434         MsgInfo *msginfo;
 435
 436 #ifdef G_OS_WIN32
 437         f = g_file_new_for_path(file);
 438         fi = g_file_query_info(f, "standard::size,standard::type,time::modified",
 439                         G_FILE_QUERY_INFO_NONE, NULL, &error);
 440         if (error != NULL) {
 441                 g_warning(error->message);
 442                 g_error_free(error);
 443                 g_object_unref(f);
 444         }
 445 #else
 446         if (g_stat(file, &s) < 0) {
 447                 FILE_OP_ERROR(file, "stat");
 448                 return NULL;
 449         }
 450 #endif
 451
 452 #ifdef G_OS_WIN32
 453         if (g_file_info_get_file_type(fi) != G_FILE_TYPE_REGULAR) {
 454                 g_object_unref(fi);
 455                 g_object_unref(f);
 456                 return NULL;
 457         }
 458 #else
 459         if (!S_ISREG(s.st_mode))
 460                 return NULL;
 461 #endif
 462
 463         if ((fp = claws_fopen(file, "rb")) == NULL) {
 464                 FILE_OP_ERROR(file, "claws_fopen");
 465                 return NULL;
 466         }
 467
 468         msginfo = procheader_parse_stream(fp, flags, full, decrypted);
 469         claws_fclose(fp);
 470
 471         if (msginfo) {
 472 #ifdef G_OS_WIN32
 473                 msginfo->size = g_file_info_get_size(fi);
 474                 g_file_info_get_modification_time(fi, &tv);
 475                 msginfo->mtime = tv.tv_sec;
 476 #else
 477                 msginfo->size = s.st_size;
 478                 msginfo->mtime = s.st_mtime;
 479 #endif
 480         }
 481
 482 #ifdef G_OS_WIN32
 483         g_object_unref(fi);
 484         g_object_unref(f);
 485 #endif
 486
 487         return msginfo;
 488 }
 489
 490 MsgInfo *procheader_parse_str(const gchar *str, MsgFlags flags, gboolean full,
 491                               gboolean decrypted)
 492 {
 493         return parse_stream(&str, TRUE, flags, full, decrypted);
 494 }
 495
 496 enum
 497 {
 498         H_DATE = 0,
 499         H_FROM,
 500         H_TO,
 501         H_CC,
 502         H_NEWSGROUPS,
 503         H_SUBJECT,
 504         H_MSG_ID,
 505         H_REFERENCES,
 506         H_IN_REPLY_TO,
 507         H_CONTENT_TYPE,
 508         H_SEEN,
 509         H_STATUS,
 510         H_FROM_SPACE,
 511         H_SC_PLANNED_DOWNLOAD,
 512         H_SC_MESSAGE_SIZE,
 513         H_FACE,
 514         H_X_FACE,
 515         H_DISPOSITION_NOTIFICATION_TO,
 516         H_RETURN_RECEIPT_TO,
 517         H_SC_PARTIALLY_RETRIEVED,
 518         H_SC_ACCOUNT_SERVER,
 519         H_SC_ACCOUNT_LOGIN,
 520         H_LIST_POST,
 521         H_LIST_SUBSCRIBE,
 522         H_LIST_UNSUBSCRIBE,
 523         H_LIST_HELP,
 524         H_LIST_ARCHIVE,
 525         H_LIST_OWNER,
 526         H_RESENT_FROM,
 527 };
 528
 529 static HeaderEntry hentry_full[] = {
 530                                    {"Date:",            NULL, FALSE},
 531                                    {"From:",            NULL, TRUE},
 532                                    {"To:",              NULL, TRUE},
 533                                    {"Cc:",              NULL, TRUE},
 534                                    {"Newsgroups:",      NULL, TRUE},
 535                                    {"Subject:",         NULL, TRUE},
 536                                    {"Message-ID:",      NULL, FALSE},
 537                                    {"References:",      NULL, FALSE},
 538                                    {"In-Reply-To:",     NULL, FALSE},
 539                                    {"Content-Type:",    NULL, FALSE},
 540                                    {"Seen:",            NULL, FALSE},
 541                                    {"Status:",          NULL, FALSE},
 542                                    {"From ",            NULL, FALSE},
 543                                    {"SC-Marked-For-Download:", NULL, FALSE},
 544                                    {"SC-Message-Size:", NULL, FALSE},
 545                                    {"Face:",            NULL, FALSE},
 546                                    {"X-Face:",          NULL, FALSE},
 547                                    {"Disposition-Notification-To:", NULL, FALSE},
 548                                    {"Return-Receipt-To:", NULL, FALSE},
 549                                    {"SC-Partially-Retrieved:", NULL, FALSE},
 550                                    {"SC-Account-Server:", NULL, FALSE},
 551                                    {"SC-Account-Login:",NULL, FALSE},
 552                                    {"List-Post:",       NULL, TRUE},
 553                                    {"List-Subscribe:",  NULL, TRUE},
 554                                    {"List-Unsubscribe:",NULL, TRUE},
 555                                    {"List-Help:",       NULL, TRUE},
 556                                    {"List-Archive:",    NULL, TRUE},
 557                                    {"List-Owner:",      NULL, TRUE},
 558                                    {"Resent-From:",     NULL, TRUE},
 559                                    {NULL,               NULL, FALSE}};
 560
 561 static HeaderEntry hentry_short[] = {
 562                                     {"Date:",           NULL, FALSE},
 563                                     {"From:",           NULL, TRUE},
 564                                     {"To:",             NULL, TRUE},
 565                                     {"Cc:",             NULL, TRUE},
 566                                     {"Newsgroups:",     NULL, TRUE},
 567                                     {"Subject:",        NULL, TRUE},
 568                                     {"Message-ID:",     NULL, FALSE},
 569                                     {"References:",     NULL, FALSE},
 570                                     {"In-Reply-To:",    NULL, FALSE},
 571                                     {"Content-Type:",   NULL, FALSE},
 572                                     {"Seen:",           NULL, FALSE},
 573                                     {"Status:",         NULL, FALSE},
 574                                     {"From ",           NULL, FALSE},
 575                                     {"SC-Marked-For-Download:", NULL, FALSE},
 576                                     {"SC-Message-Size:",NULL, FALSE},
 577                                     {NULL,              NULL, FALSE}};
 578
 579 static HeaderEntry* procheader_get_headernames(gboolean full)
 580 {
 581         return full ? hentry_full : hentry_short;
 582 }
 583
 584 MsgInfo *procheader_parse_stream(FILE *fp, MsgFlags flags, gboolean full,
 585                                  gboolean decrypted)
 586 {
 587         return parse_stream(fp, FALSE, flags, full, decrypted);
 588 }
 589
 590 static gboolean avatar_from_some_face(gpointer source, gpointer userdata)
 591 {
 592         AvatarCaptureData *acd = (AvatarCaptureData *)source;
 593
 594         if (*(acd->content) == '\0') /* won't be null, but may be empty */
 595                 return FALSE;
 596
 597         if (!strcmp(acd->header, hentry_full[H_FACE].name)) {
 598                 debug_print("avatar_from_some_face: found 'Face' header\n");
 599                 procmsg_msginfo_add_avatar(acd->msginfo, AVATAR_FACE, acd->content);
 600         }
 601 #if HAVE_LIBCOMPFACE
 602         else if (!strcmp(acd->header, hentry_full[H_X_FACE].name)) {
 603                 debug_print("avatar_from_some_face: found 'X-Face' header\n");
 604                 procmsg_msginfo_add_avatar(acd->msginfo, AVATAR_XFACE, acd->content);
 605         }
 606 #endif
 607         return FALSE;
 608 }
 609
 610 static gulong avatar_hook_id = HOOK_NONE;
 611
 612 static MsgInfo *parse_stream(void *data, gboolean isstring, MsgFlags flags,
 613                              gboolean full, gboolean decrypted)
 614 {
 615         MsgInfo *msginfo;
 616         gchar *buf = NULL;
 617         gchar *p, *tmp;
 618         gchar *hp;
 619         HeaderEntry *hentry;
 620         gint hnum;
 621         void *orig_data = data;
 622
 623         get_one_field_func get_one_field =
 624                 isstring ? (get_one_field_func)string_get_one_field
 625                          : (get_one_field_func)procheader_get_one_field;
 626
 627         hentry = procheader_get_headernames(full);
 628
 629         if (MSG_IS_QUEUED(flags) || MSG_IS_DRAFT(flags)) {
 630                 while (get_one_field(&buf, data, NULL) != -1) {
 631                         if ((!strncmp(buf, "X-Claws-End-Special-Headers: 1",
 632                                 strlen("X-Claws-End-Special-Headers:"))) ||
 633                             (!strncmp(buf, "X-Sylpheed-End-Special-Headers: 1",
 634                                 strlen("X-Sylpheed-End-Special-Headers:")))) {
 635                                 g_free(buf);
 636                                 buf = NULL;
 637                                 break;
 638                         }
 639                         /* from other mailers */
 640                         if (!strncmp(buf, "Date: ", 6)
 641                         ||  !strncmp(buf, "To: ", 4)
 642                         ||  !strncmp(buf, "From: ", 6)
 643                         ||  !strncmp(buf, "Subject: ", 9)) {
 644                                 if (isstring)
 645                                         data = orig_data;
 646                                 else
 647                                         rewind((FILE *)data);
 648                                 g_free(buf);
 649                                 buf = NULL;
 650                                 break;
 651                         }
 652                         g_free(buf);
 653                         buf = NULL;
 654                 }
 655         }
 656
 657         msginfo = procmsg_msginfo_new();
 658
 659         if (flags.tmp_flags || flags.perm_flags)
 660                 msginfo->flags = flags;
 661         else
 662                 MSG_SET_PERM_FLAGS(msginfo->flags, MSG_NEW | MSG_UNREAD);
 663
 664         msginfo->inreplyto = NULL;
 665
 666         if (avatar_hook_id == HOOK_NONE && (prefs_common.enable_avatars & AVATARS_ENABLE_CAPTURE)) {
 667                 avatar_hook_id = hooks_register_hook(AVATAR_HEADER_UPDATE_HOOKLIST, avatar_from_some_face, NULL);
 668         } else if (avatar_hook_id != HOOK_NONE && !(prefs_common.enable_avatars & AVATARS_ENABLE_CAPTURE)) {
 669                 hooks_unregister_hook(AVATAR_HEADER_UPDATE_HOOKLIST, avatar_hook_id);
 670                 avatar_hook_id = HOOK_NONE;
 671         }
 672
 673         while ((hnum = get_one_field(&buf, data, hentry)) != -1) {
 674                 hp = buf + strlen(hentry[hnum].name);
 675                 while (*hp == ' ' || *hp == '\t') hp++;
 676
 677                 switch (hnum) {
 678                 case H_DATE:
 679                         if (msginfo->date) break;
 680                         msginfo->date_t =
 681                                 procheader_date_parse(NULL, hp, 0);
 682                         if (g_utf8_validate(hp, -1, NULL)) {
 683                                 msginfo->date = g_strdup(hp);
 684                         } else {
 685                                 gchar *utf = conv_codeset_strdup(
 686                                         hp,
 687                                         conv_get_locale_charset_str_no_utf8(),
 688                                         CS_INTERNAL);
 689                                 if (utf == NULL ||
 690                                     !g_utf8_validate(utf, -1, NULL)) {
 691                                         g_free(utf);
 692                                         utf = g_malloc(strlen(buf)*2+1);
 693                                         conv_localetodisp(utf,
 694                                                 strlen(hp)*2+1, hp);
 695                                 }
 696                                 msginfo->date = utf;
 697                         }
 698                         break;
 699                 case H_FROM:
 700                         if (msginfo->from) break;
 701                         msginfo->from = conv_unmime_header(hp, NULL, TRUE);
 702                         msginfo->fromname = procheader_get_fromname(msginfo->from);
 703                         remove_return(msginfo->from);
 704                         remove_return(msginfo->fromname);
 705                         break;
 706                 case H_TO:
 707                         tmp = conv_unmime_header(hp, NULL, TRUE);
 708                         remove_return(tmp);
 709                         if (msginfo->to) {
 710                                 p = msginfo->to;
 711                                 msginfo->to =
 712                                         g_strconcat(p, ", ", tmp, NULL);
 713                                 g_free(p);
 714                         } else
 715                                 msginfo->to = g_strdup(tmp);
 716                         g_free(tmp);
 717                         break;
 718                 case H_CC:
 719                         tmp = conv_unmime_header(hp, NULL, TRUE);
 720                         remove_return(tmp);
 721                         if (msginfo->cc) {
 722                                 p = msginfo->cc;
 723                                 msginfo->cc =
 724                                         g_strconcat(p, ", ", tmp, NULL);
 725                                 g_free(p);
 726                         } else
 727                                 msginfo->cc = g_strdup(tmp);
 728                         g_free(tmp);
 729                         break;
 730                 case H_NEWSGROUPS:
 731                         if (msginfo->newsgroups) {
 732                                 p = msginfo->newsgroups;
 733                                 msginfo->newsgroups =
 734                                         g_strconcat(p, ",", hp, NULL);
 735                                 g_free(p);
 736                         } else
 737                                 msginfo->newsgroups = g_strdup(hp);
 738                         break;
 739                 case H_SUBJECT:
 740                         if (msginfo->subject) break;
 741                         msginfo->subject = conv_unmime_header(hp, NULL, FALSE);
 742                         unfold_line(msginfo->subject);
 743                        break;
 744                 case H_MSG_ID:
 745                         if (msginfo->msgid) break;
 746
 747                         extract_parenthesis(hp, '<', '>');
 748                         remove_space(hp);
 749                         msginfo->msgid = g_strdup(hp);
 750                         break;
 751                 case H_REFERENCES:
 752                         msginfo->references =
 753                                 references_list_prepend(msginfo->references,
 754                                                         hp);
 755                         break;
 756                 case H_IN_REPLY_TO:
 757                         if (msginfo->inreplyto) break;
 758
 759                         eliminate_parenthesis(hp, '(', ')');
 760                         if ((p = strrchr(hp, '<')) != NULL &&
 761                             strchr(p + 1, '>') != NULL) {
 762                                 extract_parenthesis(p, '<', '>');
 763                                 remove_space(p);
 764                                 if (*p != '\0')
 765                                         msginfo->inreplyto = g_strdup(p);
 766                         }
 767                         break;
 768                 case H_CONTENT_TYPE:
 769                         if (!g_ascii_strncasecmp(hp, "multipart/", 10))
 770                                 MSG_SET_TMP_FLAGS(msginfo->flags, MSG_MULTIPART);
 771                         break;
 772                 case H_DISPOSITION_NOTIFICATION_TO:
 773                         if (!msginfo->extradata)
 774                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 775                         if (msginfo->extradata->dispositionnotificationto) break;
 776                         msginfo->extradata->dispositionnotificationto = g_strdup(hp);
 777                         break;
 778                 case H_RETURN_RECEIPT_TO:
 779                         if (!msginfo->extradata)
 780                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 781                         if (msginfo->extradata->returnreceiptto) break;
 782                         msginfo->extradata->returnreceiptto = g_strdup(hp);
 783                         break;
 784 /* partial download infos */
 785                 case H_SC_PARTIALLY_RETRIEVED:
 786                         if (!msginfo->extradata)
 787                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 788                         if (msginfo->extradata->partial_recv) break;
 789                         msginfo->extradata->partial_recv = g_strdup(hp);
 790                         break;
 791                 case H_SC_ACCOUNT_SERVER:
 792                         if (!msginfo->extradata)
 793                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 794                         if (msginfo->extradata->account_server) break;
 795                         msginfo->extradata->account_server = g_strdup(hp);
 796                         break;
 797                 case H_SC_ACCOUNT_LOGIN:
 798                         if (!msginfo->extradata)
 799                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 800                         if (msginfo->extradata->account_login) break;
 801                         msginfo->extradata->account_login = g_strdup(hp);
 802                         break;
 803                 case H_SC_MESSAGE_SIZE:
 804                         if (msginfo->total_size) break;
 805                         msginfo->total_size = atoi(hp);
 806                         break;
 807                 case H_SC_PLANNED_DOWNLOAD:
 808                         msginfo->planned_download = atoi(hp);
 809                         break;
 810 /* end partial download infos */
 811                 case H_FROM_SPACE:
 812                         if (msginfo->fromspace) break;
 813                         msginfo->fromspace = g_strdup(hp);
 814                         remove_return(msginfo->fromspace);
 815                         break;
 816 /* list infos */
 817                 case H_LIST_POST:
 818                         if (!msginfo->extradata)
 819                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 820                         if (msginfo->extradata->list_post) break;
 821                         msginfo->extradata->list_post = g_strdup(hp);
 822                         break;
 823                 case H_LIST_SUBSCRIBE:
 824                         if (!msginfo->extradata)
 825                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 826                         if (msginfo->extradata->list_subscribe) break;
 827                         msginfo->extradata->list_subscribe = g_strdup(hp);
 828                         break;
 829                 case H_LIST_UNSUBSCRIBE:
 830                         if (!msginfo->extradata)
 831                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 832                         if (msginfo->extradata->list_unsubscribe) break;
 833                         msginfo->extradata->list_unsubscribe = g_strdup(hp);
 834                         break;
 835                 case H_LIST_HELP:
 836                         if (!msginfo->extradata)
 837                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 838                         if (msginfo->extradata->list_help) break;
 839                         msginfo->extradata->list_help = g_strdup(hp);
 840                         break;
 841                 case H_LIST_ARCHIVE:
 842                         if (!msginfo->extradata)
 843                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 844                         if (msginfo->extradata->list_archive) break;
 845                         msginfo->extradata->list_archive = g_strdup(hp);
 846                         break;
 847                 case H_LIST_OWNER:
 848                         if (!msginfo->extradata)
 849                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 850                         if (msginfo->extradata->list_owner) break;
 851                         msginfo->extradata->list_owner = g_strdup(hp);
 852                         break;
 853                 case H_RESENT_FROM:
 854                         if (!msginfo->extradata)
 855                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 856                         if (msginfo->extradata->resent_from) break;
 857                         msginfo->extradata->resent_from = g_strdup(hp);
 858                         break;
 859 /* end list infos */
 860                 default:
 861                         break;
 862                 }
 863                 /* to avoid performance penalty hooklist is invoked only for
 864                    headers known to be able to generate avatars */
 865                 if (hnum == H_FROM || hnum == H_X_FACE || hnum == H_FACE) {
 866                         AvatarCaptureData *acd = g_new0(AvatarCaptureData, 1);
 867                         /* no extra memory is wasted, hooks are expected to
 868                            take care of copying members when needed */
 869                         acd->msginfo = msginfo;
 870                         acd->header  = hentry_full[hnum].name;
 871                         acd->content = hp;
 872                         hooks_invoke(AVATAR_HEADER_UPDATE_HOOKLIST, (gpointer)acd);
 873                         g_free(acd);
 874                 }
 875                 g_free(buf);
 876                 buf = NULL;
 877         }
 878
 879         if (!msginfo->inreplyto && msginfo->references)
 880                 msginfo->inreplyto =
 881                         g_strdup((gchar *)msginfo->references->data);
 882
 883         return msginfo;
 884 }
 885
 886 gchar *procheader_get_fromname(const gchar *str)
 887 {
 888         gchar *tmp, *name;
 889
 890         Xstrdup_a(tmp, str, return NULL);
 891
 892         if (*tmp == '\"') {
 893                 extract_quote(tmp, '\"');
 894                 g_strstrip(tmp);
 895         } else if (strchr(tmp, '<')) {
 896                 eliminate_parenthesis(tmp, '<', '>');
 897                 g_strstrip(tmp);
 898                 if (*tmp == '\0') {
 899                         strcpy(tmp, str);
 900                         extract_parenthesis(tmp, '<', '>');
 901                         g_strstrip(tmp);
 902                 }
 903         } else if (strchr(tmp, '(')) {
 904                 extract_parenthesis(tmp, '(', ')');
 905                 g_strstrip(tmp);
 906         }
 907
 908         if (*tmp == '\0')
 909                 name = g_strdup(str);
 910         else
 911                 name = g_strdup(tmp);
 912
 913         return name;
 914 }
 915
 916 static gint procheader_scan_date_string(const gchar *str,
 917                                         gchar *weekday, gint *day,
 918                                         gchar *month, gint *year,
 919                                         gint *hh, gint *mm, gint *ss,
 920                                         gchar *zone)
 921 {
 922         gint result;
 923         gint month_n;
 924         gint secfract;
 925         gint zone1 = 0, zone2 = 0;
 926         gchar offset_sign, zonestr[7];
 927         gchar sep1;
 928
 929         if (str == NULL)
 930                 return -1;
 931
 932         result = sscanf(str, "%10s %d %9s %d %2d:%2d:%2d %6s",
 933                         weekday, day, month, year, hh, mm, ss, zone);
 934         if (result == 8) return 0;
 935
 936         /* RFC2822 */
 937         result = sscanf(str, "%3s,%d %9s %d %2d:%2d:%2d %6s",
 938                         weekday, day, month, year, hh, mm, ss, zone);
 939         if (result == 8) return 0;
 940
 941         result = sscanf(str, "%d %9s %d %2d:%2d:%2d %6s",
 942                         day, month, year, hh, mm, ss, zone);
 943         if (result == 7) return 0;
 944
 945         *zone = '\0';
 946         result = sscanf(str, "%10s %d %9s %d %2d:%2d:%2d",
 947                         weekday, day, month, year, hh, mm, ss);
 948         if (result == 7) return 0;
 949
 950         result = sscanf(str, "%d %9s %d %2d:%2d:%2d",
 951                         day, month, year, hh, mm, ss);
 952         if (result == 6) return 0;
 953
 954         *ss = 0;
 955         result = sscanf(str, "%10s %d %9s %d %2d:%2d %6s",
 956                         weekday, day, month, year, hh, mm, zone);
 957         if (result == 7) return 0;
 958
 959         result = sscanf(str, "%d %9s %d %2d:%2d %5s",
 960                         day, month, year, hh, mm, zone);
 961         if (result == 6) return 0;
 962
 963         *zone = '\0';
 964         result = sscanf(str, "%10s %d %9s %d %2d:%2d",
 965                         weekday, day, month, year, hh, mm);
 966         if (result == 6) return 0;
 967
 968         result = sscanf(str, "%d %9s %d %2d:%2d",
 969                         day, month, year, hh, mm);
 970         if (result == 5) return 0;
 971
 972         *weekday = '\0';
 973
 974         /* RFC3339 subset, with fraction of second */
 975         result = sscanf(str, "%4d-%2d-%2d%c%2d:%2d:%2d.%d%6s",
 976                         year, &month_n, day, &sep1, hh, mm, ss, &secfract, zonestr);
 977         if (result == 9
 978                         && (sep1 == 'T' || sep1 == 't' || sep1 == ' ')) {
 979                 if (month_n >= 1 && month_n <= 12) {
 980                         strncpy2(month, monthstr+((month_n-1)*3), 4);
 981                         if (zonestr[0] == 'z' || zonestr[0] == 'Z') {
 982                                 strcat(zone, "+00:00");
 983                         } else if (sscanf(zonestr, "%c%2d:%2d",
 984                                                 &offset_sign, &zone1, &zone2) == 3) {
 985                                 strcat(zone, zonestr);
 986                         }
 987                         return 0;
 988                 }
 989         }
 990
 991         /* RFC3339 subset, no fraction of second */
 992         result = sscanf(str, "%4d-%2d-%2d%c%2d:%2d:%2d%6s",
 993                         year, &month_n, day, &sep1, hh, mm, ss, zonestr);
 994         if (result == 8
 995                         && (sep1 == 'T' || sep1 == 't' || sep1 == ' ')) {
 996                 if (month_n >= 1 && month_n <= 12) {
 997                         strncpy2(month, monthstr+((month_n-1)*3), 4);
 998                         if (zonestr[0] == 'z' || zonestr[0] == 'Z') {
 999                                 strcat(zone, "+00:00");
1000                         } else if (sscanf(zonestr, "%c%2d:%2d",
1001                                                 &offset_sign, &zone1, &zone2) == 3) {
1002                                 strcat(zone, zonestr);
1003                         }
1004                         return 0;
1005                 }
1006         }
1007
1008         *zone = '\0';
1009
1010         /* RFC3339 subset, no fraction of second, and no timezone offset */
1011         /* This particular "subset" is invalid, RFC requires the offset */
1012         result = sscanf(str, "%4d-%2d-%2d %2d:%2d:%2d",
1013                         year, &month_n, day, hh, mm, ss);
1014         if (result == 6) {
1015                 if (1 <= month_n && month_n <= 12) {
1016                         strncpy2(month, monthstr+((month_n-1)*3), 4);
1017                         return 0;
1018                 }
1019         }
1020
1021         /* ISO8601 format with just date (YYYY-MM-DD) */
1022         result = sscanf(str, "%4d-%2d-%2d",
1023                         year, &month_n, day);
1024         if (result == 3) {
1025                 *hh = *mm = *ss = 0;
1026                 if (1 <= month_n && month_n <= 12) {
1027                         strncpy2(month, monthstr+((month_n-1)*3), 4);
1028                         return 0;
1029                 }
1030         }
1031
1032         return -1;
1033 }
1034
1035 /*
1036  * Hiro, most UNIXen support this function:
1037  * http://www.mcsr.olemiss.edu/cgi-bin/man-cgi?getdate
1038  */
1039 gboolean procheader_date_parse_to_tm(const gchar *src, struct tm *t, char *zone)
1040 {
1041         gchar weekday[11];
1042         gint day;
1043         gchar month[10];
1044         gint year;
1045         gint hh, mm, ss;
1046         GDateMonth dmonth;
1047         gchar *p;
1048
1049         if (!t)
1050                 return FALSE;
1051
1052         memset(t, 0, sizeof *t);
1053
1054         if (procheader_scan_date_string(src, weekday, &day, month, &year,
1055                                         &hh, &mm, &ss, zone) < 0) {
1056                 g_warning("Invalid date: %s", src);
1057                 return FALSE;
1058         }
1059
1060         /* Y2K compliant :) */
1061         if (year < 100) {
1062                 if (year < 70)
1063                         year += 2000;
1064                 else
1065                         year += 1900;
1066         }
1067
1068         month[3] = '\0';
1069         if ((p = strstr(monthstr, month)) != NULL)
1070                 dmonth = (gint)(p - monthstr) / 3 + 1;
1071         else {
1072                 g_warning("Invalid month: %s", month);
1073                 dmonth = G_DATE_BAD_MONTH;
1074         }
1075
1076         t->tm_sec = ss;
1077         t->tm_min = mm;
1078         t->tm_hour = hh;
1079         t->tm_mday = day;
1080         t->tm_mon = dmonth - 1;
1081         t->tm_year = year - 1900;
1082         t->tm_wday = 0;
1083         t->tm_yday = 0;
1084         t->tm_isdst = -1;
1085
1086         mktime(t);
1087
1088         return TRUE;
1089 }
1090
1091 time_t procheader_date_parse(gchar *dest, const gchar *src, gint len)
1092 {
1093         gchar weekday[11];
1094         gint day;
1095         gchar month[10];
1096         gint year;
1097         gint hh, mm, ss;
1098         gchar zone[7];
1099         GDateMonth dmonth = G_DATE_BAD_MONTH;
1100         gchar *p;
1101         time_t timer;
1102
1103         if (procheader_scan_date_string(src, weekday, &day, month, &year,
1104                                         &hh, &mm, &ss, zone) < 0) {
1105                 if (dest && len > 0)
1106                         strncpy2(dest, src, len);
1107                 return 0;
1108         }
1109
1110         month[3] = '\0';
1111         for (p = monthstr; *p != '\0'; p += 3) {
1112                 if (!g_ascii_strncasecmp(p, month, 3)) {
1113                         dmonth = (gint)(p - monthstr) / 3 + 1;
1114                         break;
1115                 }
1116         }
1117
1118 #ifdef G_OS_WIN32
1119         GTimeZone *tz;
1120         GDateTime *dt, *dt2;
1121
1122         tz = g_time_zone_new(zone); // can't return NULL no need to check for it
1123         dt = g_date_time_new(tz, 1, 1, 1, 0, 0, 0);
1124         g_time_zone_unref(tz);
1125         dt2 = g_date_time_add_full(dt, year-1, dmonth-1, day-1, hh, mm, ss);
1126         g_date_time_unref(dt);
1127
1128         timer = g_date_time_to_unix(dt2);
1129         g_date_time_unref(dt2);
1130
1131 #else
1132         struct tm t;
1133         time_t tz_offset;
1134
1135         /* Y2K compliant :) */
1136         if (year < 1000) {
1137                 if (year < 50)
1138                         year += 2000;
1139                 else
1140                         year += 1900;
1141         }
1142
1143         t.tm_sec = ss;
1144         t.tm_min = mm;
1145         t.tm_hour = hh;
1146         t.tm_mday = day;
1147         t.tm_mon = dmonth - 1;
1148         t.tm_year = year - 1900;
1149         t.tm_wday = 0;
1150         t.tm_yday = 0;
1151         t.tm_isdst = -1;
1152
1153         timer = mktime(&t);
1154         tz_offset = remote_tzoffset_sec(zone);
1155         if (tz_offset != -1)
1156                 timer += tzoffset_sec(&timer) - tz_offset;
1157
1158         if (dest)
1159                 procheader_date_get_localtime(dest, len, timer);
1160 #endif
1161
1162         return timer;
1163 }
1164
1165 void procheader_date_get_localtime(gchar *dest, gint len, const time_t timer)
1166 {
1167         struct tm *lt;
1168         gchar *default_format = "%y/%m/%d(%a) %H:%M";
1169         gchar *str;
1170         const gchar *src_codeset, *dest_codeset;
1171         struct tm buf;
1172
1173         if (timer > 0)
1174                 lt = localtime_r(&timer, &buf);
1175         else {
1176                 time_t dummy = 1;
1177                 lt = localtime_r(&dummy, &buf);
1178         }
1179
1180         if (prefs_common.date_format)
1181                 fast_strftime(dest, len, prefs_common.date_format, lt);
1182         else
1183                 fast_strftime(dest, len, default_format, lt);
1184
1185         if (!g_utf8_validate(dest, -1, NULL)) {
1186                 src_codeset = conv_get_locale_charset_str_no_utf8();
1187                 dest_codeset = CS_UTF_8;
1188                 str = conv_codeset_strdup(dest, src_codeset, dest_codeset);
1189                 if (str) {
1190                         strncpy2(dest, str, len);
1191                         g_free(str);
1192                 }
1193         }
1194 }
1195
1196 /* Added by Mel Hadasht on 27 Aug 2001 */
1197 /* Get a header from msginfo */
1198 gint procheader_get_header_from_msginfo(MsgInfo *msginfo, gchar **buf, gchar *header)
1199 {
1200         gchar *file;
1201         FILE *fp;
1202         HeaderEntry hentry[]={ { NULL, NULL, TRUE  },
1203                                                    { NULL, NULL, FALSE } };
1204         gint val;
1205
1206         cm_return_val_if_fail(msginfo != NULL, -1);
1207         cm_return_val_if_fail(buf != NULL, -1);
1208         cm_return_val_if_fail(header != NULL, -1);
1209
1210         hentry[0].name = header;
1211
1212         file = procmsg_get_message_file_path(msginfo);
1213         if ((fp = claws_fopen(file, "rb")) == NULL) {
1214                 FILE_OP_ERROR(file, "claws_fopen");
1215                 g_free(file);
1216                 g_free(*buf);
1217                 *buf = NULL;
1218                 return -1;
1219         }
1220         val = procheader_get_one_field(buf, fp, hentry);
1221
1222         if (claws_fclose(fp) == EOF) {
1223                 FILE_OP_ERROR(file, "claws_fclose");
1224                 claws_unlink(file);
1225                 g_free(file);
1226                 g_free(*buf);
1227                 *buf = NULL;
1228                 return -1;
1229         }
1230
1231         g_free(file);
1232         if (val == -1) {
1233                 /* *buf is already NULL in that case, see procheader_get_one_field() */
1234                 return -1;
1235         }
1236
1237         return 0;
1238 }
1239
1240 HeaderEntry *procheader_entries_from_str(const gchar *str)
1241 {
1242         HeaderEntry *entries = NULL, *he;
1243         int numh = 0, i = 0;
1244         gchar **names = NULL;
1245         const gchar *s = str;
1246
1247         if (s == NULL) {
1248                 return NULL;
1249         }
1250         while (*s != '\0') {
1251                 if (*s == ' ') ++numh;
1252                 ++s;
1253         }
1254         if (numh == 0) {
1255                 return NULL;
1256         }
1257         entries = g_new0(HeaderEntry, numh + 1); /* room for last NULL */
1258         s = str;
1259         ++s; /* skip first space */
1260         names = g_strsplit(s, " ", numh);
1261         he = entries;
1262         while (names[i]) {
1263                 he->name = g_strdup_printf("%s:", names[i]);
1264                 he->body = NULL;
1265                 he->unfold = FALSE;
1266                 ++i, ++he;
1267         }
1268         he->name = NULL;
1269         g_strfreev(names);
1270         return entries;
1271 }
1272
1273 void procheader_entries_free (HeaderEntry *entries)
1274 {
1275         if (entries != NULL) {
1276                 HeaderEntry *he = entries;
1277                 while (he->name != NULL) {
1278                         g_free(he->name);
1279                         if (he->body != NULL)
1280                                 g_free(he->body);
1281                         ++he;
1282                 }
1283                 g_free(entries);
1284         }
1285 }
1286
1287 gboolean procheader_header_is_internal(const gchar *hdr_name)
1288 {
1289         const gchar *internal_hdrs[] = {
1290                 "AF:", "NF:", "PS:", "SRH:", "SFN:", "DSR:", "MID:", "CFG:",
1291                 "PT:", "S:", "RQ:", "SSV:", "NSV:", "SSH:", "R:", "MAID:",
1292                 "SCF:", "RMID:", "FMID:", "NAID:",
1293                 "X-Claws-Account-Id:",
1294                 "X-Claws-Sign:",
1295                 "X-Claws-Encrypt:",
1296                 "X-Claws-Privacy-System:",
1297                 "X-Claws-Auto-Wrapping:",
1298                 "X-Claws-Auto-Indent:",
1299                 "X-Claws-End-Special-Headers:",
1300                 "X-Sylpheed-Account-Id:",
1301                 "X-Sylpheed-Sign:",
1302                 "X-Sylpheed-Encrypt:",
1303                 "X-Sylpheed-Privacy-System:",
1304                 "X-Sylpheed-End-Special-Headers:",
1305                  NULL
1306         };
1307         int i;
1308
1309         for (i = 0; internal_hdrs[i]; i++) {
1310                 if (!strcmp(hdr_name, internal_hdrs[i]))
1311                         return TRUE;
1312         }
1313         return FALSE;
1314 }