src/procheader.c

   1 /*
   2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2023 the Claws Mail team and Hiroyuki Yamamoto
   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 #include "procheader.h"
  34 #include "procmsg.h"
  35 #include "codeconv.h"
  36 #include "prefs_common.h"
  37 #include "hooks.h"
  38 #include "utils.h"
  39 #include "defs.h"
  40 #include "file-utils.h"
  41
  42 #define BUFFSIZE        8192
  43
  44 static gchar monthstr[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
  45
  46 typedef char *(*getlinefunc) (char *, size_t, void *);
  47 typedef int (*peekcharfunc) (void *);
  48 typedef int (*getcharfunc) (void *);
  49 typedef gint (*get_one_field_func) (gchar **, void *, HeaderEntry[]);
  50
  51 static gint string_get_one_field(gchar **buf, char **str,
  52                                  HeaderEntry hentry[]);
  53
  54 static char *string_getline(char *buf, size_t len, char **str);
  55 static int string_peekchar(char **str);
  56 static int file_peekchar(FILE *fp);
  57 static gint generic_get_one_field(gchar **bufptr, void *data,
  58                                   HeaderEntry hentry[],
  59                                   getlinefunc getline,
  60                                   peekcharfunc peekchar,
  61                                   gboolean unfold);
  62 static MsgInfo *parse_stream(void *data, gboolean isstring, MsgFlags flags,
  63                              gboolean full, gboolean decrypted);
  64
  65
  66 gint procheader_get_one_field(gchar **buf, FILE *fp,
  67                               HeaderEntry hentry[])
  68 {
  69         return generic_get_one_field(buf, fp, hentry,
  70                                      (getlinefunc)fgets_crlf, (peekcharfunc)file_peekchar,
  71                                      TRUE);
  72 }
  73
  74 static gint string_get_one_field(gchar **buf, char **str,
  75                                  HeaderEntry hentry[])
  76 {
  77         return generic_get_one_field(buf, str, hentry,
  78                                      (getlinefunc)string_getline,
  79                                      (peekcharfunc)string_peekchar,
  80                                      TRUE);
  81 }
  82
  83 gboolean procheader_skip_headers(FILE *fp)
  84 {
  85         gchar *buf = g_malloc(BUFFSIZE);
  86         do {
  87                 if (fgets_crlf(buf, BUFFSIZE - 1, fp) == NULL) {
  88                         g_free(buf);
  89                         return FALSE;
  90                 }
  91                 if (buf[0] == '\r' || buf[0] == '\n') {
  92                         break;
  93                 }
  94         } while (TRUE);
  95         g_free(buf);
  96
  97         return TRUE;
  98 }
  99
 100
 101 static char *string_getline(char *buf, size_t len, char **str)
 102 {
 103         gboolean is_cr = FALSE;
 104         gboolean last_was_cr = FALSE;
 105
 106         if (!*str || !**str)
 107                 return NULL;
 108
 109         for (; **str && len > 1; --len) {
 110                 is_cr = (**str == '\r');
 111                 if ((*buf++ = *(*str)++) == '\n') {
 112                     break;
 113                 }
 114                 if (last_was_cr) {
 115                         *(--buf) = '\n';
 116                         buf++;
 117                     break;
 118                 }
 119                 last_was_cr = is_cr;
 120         }
 121
 122         *buf = '\0';
 123
 124         return buf;
 125 }
 126
 127 static int string_peekchar(char **str)
 128 {
 129         return **str;
 130 }
 131
 132 static int file_peekchar(FILE *fp)
 133 {
 134         return ungetc(getc(fp), fp);
 135 }
 136
 137 static gint generic_get_one_field(gchar **bufptr, void *data,
 138                           HeaderEntry *hentry,
 139                           getlinefunc getline, peekcharfunc peekchar,
 140                           gboolean unfold)
 141 {
 142         /* returns -1 in case of failure of any kind, whatever it's a parsing error
 143            or an allocation error. if returns -1, *bufptr is always NULL, and vice-versa,
 144            and if returning 0 (OK), *bufptr is always non-NULL, so callers just have to
 145            test the return value
 146         */
 147         gint nexthead;
 148         gint hnum = 0;
 149         HeaderEntry *hp = NULL;
 150         size_t len;
 151         gchar *buf;
 152
 153         cm_return_val_if_fail(bufptr != NULL, -1);
 154
 155         len = BUFFSIZE;
 156         buf = g_malloc(len);
 157
 158         if (hentry != NULL) {
 159                 /* skip non-required headers */
 160                 /* and get hentry header line */
 161                 do {
 162                         do {
 163                                 if (getline(buf, len, data) == NULL) {
 164                                         debug_print("generic_get_one_field: getline\n");
 165                                         g_free(buf);
 166                                         *bufptr = NULL;
 167                                         return -1;
 168                                 }
 169                                 if (buf[0] == '\r' || buf[0] == '\n') {
 170                                         debug_print("generic_get_one_field: empty line\n");
 171                                         g_free(buf);
 172                                         *bufptr = NULL;
 173                                         return -1;
 174                                 }
 175                         } while (buf[0] == ' ' || buf[0] == '\t');
 176
 177                         for (hp = hentry, hnum = 0; hp->name != NULL;
 178                              hp++, hnum++) {
 179                                 if (!g_ascii_strncasecmp(hp->name, buf,
 180                                                  strlen(hp->name)))
 181                                         break;
 182                         }
 183                 } while (hp->name == NULL);
 184         } else {
 185                 /* read first line */
 186                 if (getline(buf, len, data) == NULL) {
 187                         debug_print("generic_get_one_field: getline\n");
 188                         g_free(buf);
 189                         *bufptr = NULL;
 190                         return -1;
 191                 }
 192                 if (buf[0] == '\r' || buf[0] == '\n') {
 193                         debug_print("generic_get_one_field: empty line\n");
 194                         g_free(buf);
 195                         *bufptr = NULL;
 196                         return -1;
 197                 }
 198         }
 199         /* reduce initial buffer to its useful part */
 200         len = strlen(buf)+1;
 201         buf = g_realloc(buf, len);
 202         if (buf == NULL) {
 203                 debug_print("generic_get_one_field: reallocation error\n");
 204                 *bufptr = NULL;
 205                 return -1;
 206         }
 207
 208         /* unfold line */
 209         while (1) {
 210                 nexthead = peekchar(data);
 211                 /* ([*WSP CRLF] 1*WSP) */
 212                 if (nexthead == ' ' || nexthead == '\t') {
 213                         size_t buflen;
 214                         gchar *tmpbuf;
 215                         size_t tmplen;
 216
 217                         gboolean skiptab = (nexthead == '\t');
 218                         /* trim previous trailing \n if requesting one header or
 219                          * unfolding was requested */
 220                         if ((!hentry && unfold) || (hp && hp->unfold))
 221                                 strretchomp(buf);
 222
 223                         buflen = strlen(buf);
 224
 225                         /* read next line */
 226                         tmpbuf = g_malloc(BUFFSIZE);
 227
 228                         if (getline(tmpbuf, BUFFSIZE, data) == NULL) {
 229                                 g_free(tmpbuf);
 230                                 break;
 231                         }
 232                         tmplen = strlen(tmpbuf)+1;
 233
 234                         /* extend initial buffer and concatenate next line */
 235                         len += tmplen;
 236                         buf = g_realloc(buf, len);
 237                         if (buf == NULL) {
 238                                 debug_print("generic_get_one_field: reallocation error\n");
 239                                 g_free(buf);
 240                                 *bufptr = NULL;
 241                                 return -1;
 242                         }
 243                         memcpy(buf+buflen, tmpbuf, tmplen);
 244                         g_free(tmpbuf);
 245                         if (skiptab) { /* replace tab with space */
 246                                 *(buf + buflen) = ' ';
 247                         }
 248                 } else {
 249                         /* remove trailing new line */
 250                         strretchomp(buf);
 251                         break;
 252                 }
 253         }
 254
 255         *bufptr = buf;
 256
 257         return hnum;
 258 }
 259
 260 gint procheader_get_one_field_asis(gchar **buf, FILE *fp)
 261 {
 262         return generic_get_one_field(buf, fp, NULL,
 263                                      (getlinefunc)fgets_crlf,
 264                                      (peekcharfunc)file_peekchar,
 265                                      FALSE);
 266 }
 267
 268 GPtrArray *procheader_get_header_array(FILE *fp)
 269 {
 270         gchar *buf = NULL;
 271         GPtrArray *headers;
 272         Header *header;
 273
 274         cm_return_val_if_fail(fp != NULL, NULL);
 275
 276         headers = g_ptr_array_new();
 277
 278         while (procheader_get_one_field(&buf, fp, NULL) != -1) {
 279                 if ((header = procheader_parse_header(buf)) != NULL)
 280                         g_ptr_array_add(headers, header);
 281                 g_free(buf);
 282                 buf = NULL;
 283         }
 284
 285         return headers;
 286 }
 287
 288 void procheader_header_array_destroy(GPtrArray *harray)
 289 {
 290         gint i;
 291         Header *header;
 292
 293         cm_return_if_fail(harray != NULL);
 294
 295         for (i = 0; i < harray->len; i++) {
 296                 header = g_ptr_array_index(harray, i);
 297                 procheader_header_free(header);
 298         }
 299
 300         g_ptr_array_free(harray, TRUE);
 301 }
 302
 303 void procheader_header_free(Header *header)
 304 {
 305         if (!header) return;
 306
 307         g_free(header->name);
 308         g_free(header->body);
 309         g_free(header);
 310 }
 311
 312 /*
 313   tests whether two headers' names are equal
 314   remove the trailing ':' or ' ' before comparing
 315 */
 316
 317 gboolean procheader_headername_equal(char * hdr1, char * hdr2)
 318 {
 319         int len1;
 320         int len2;
 321
 322         len1 = strlen(hdr1);
 323         len2 = strlen(hdr2);
 324         if (hdr1[len1 - 1] == ':')
 325                 len1--;
 326         if (hdr2[len2 - 1] == ':')
 327                 len2--;
 328         if (len1 != len2)
 329                 return 0;
 330
 331         return (g_ascii_strncasecmp(hdr1, hdr2, len1) == 0);
 332 }
 333
 334 /*
 335   parse headers, for example :
 336   From: dinh@enseirb.fr becomes :
 337   header->name = "From:"
 338   header->body = "dinh@enseirb.fr"
 339  */
 340 static gboolean header_is_addr_field(const gchar *hdr)
 341 {
 342         static char *addr_headers[] = {
 343                                 "To:",
 344                                 "Cc:",
 345                                 "Bcc:",
 346                                 "From:",
 347                                 "Reply-To:",
 348                                 "Followup-To:",
 349                                 "Followup-and-Reply-To:",
 350                                 "Disposition-Notification-To:",
 351                                 "Return-Receipt-To:",
 352                                 NULL};
 353         int i;
 354
 355         if (!hdr)
 356                 return FALSE;
 357
 358         for (i = 0; addr_headers[i] != NULL; i++)
 359                 if (!strcasecmp(hdr, addr_headers[i]))
 360                         return FALSE;
 361
 362         return FALSE;
 363 }
 364
 365 Header * procheader_parse_header(gchar * buf)
 366 {
 367         gchar *p;
 368         Header * header;
 369         gboolean addr_field = FALSE;
 370
 371         cm_return_val_if_fail(buf != NULL, NULL);
 372
 373         if ((*buf == ':') || (*buf == ' '))
 374                 return NULL;
 375
 376         for (p = buf; *p ; p++) {
 377                 if ((*p == ':') || (*p == ' ')) {
 378                         header = g_new(Header, 1);
 379                         header->name = g_strndup(buf, p - buf + 1);
 380                         addr_field = header_is_addr_field(header->name);
 381                         p++;
 382                         while (*p == ' ' || *p == '\t') p++;
 383                         header->body = conv_unmime_header(p, NULL, addr_field);
 384                         return header;
 385                 }
 386         }
 387         return NULL;
 388 }
 389
 390 void procheader_get_header_fields(FILE *fp, HeaderEntry hentry[])
 391 {
 392         gchar *buf = NULL;
 393         HeaderEntry *hp;
 394         gint hnum;
 395         gchar *p;
 396
 397         if (hentry == NULL) return;
 398
 399         while ((hnum = procheader_get_one_field(&buf, fp, hentry)) != -1) {
 400                 hp = hentry + hnum;
 401
 402                 p = buf + strlen(hp->name);
 403                 while (*p == ' ' || *p == '\t') p++;
 404
 405                 if (hp->body == NULL)
 406                         hp->body = g_strdup(p);
 407                 else if (procheader_headername_equal(hp->name, "To") ||
 408                          procheader_headername_equal(hp->name, "Cc")) {
 409                         gchar *tp = hp->body;
 410                         hp->body = g_strconcat(tp, ", ", p, NULL);
 411                         g_free(tp);
 412                 }
 413                 g_free(buf);
 414                 buf = NULL;
 415         }
 416 }
 417
 418 MsgInfo *procheader_parse_file(const gchar *file, MsgFlags flags,
 419                                gboolean full, gboolean decrypted)
 420 {
 421 #ifdef G_OS_WIN32
 422         GFile *f;
 423         GFileInfo *fi;
 424         GTimeVal tv;
 425         GError *error = NULL;
 426 #else
 427         GStatBuf s;
 428 #endif
 429         FILE *fp;
 430         MsgInfo *msginfo;
 431
 432 #ifdef G_OS_WIN32
 433         f = g_file_new_for_path(file);
 434         fi = g_file_query_info(f, "standard::size,standard::type,time::modified",
 435                         G_FILE_QUERY_INFO_NONE, NULL, &error);
 436         if (error != NULL) {
 437                 g_warning(error->message);
 438                 g_error_free(error);
 439                 g_object_unref(f);
 440         }
 441 #else
 442         if (g_stat(file, &s) < 0) {
 443                 FILE_OP_ERROR(file, "stat");
 444                 return NULL;
 445         }
 446 #endif
 447
 448 #ifdef G_OS_WIN32
 449         if (g_file_info_get_file_type(fi) != G_FILE_TYPE_REGULAR) {
 450                 g_object_unref(fi);
 451                 g_object_unref(f);
 452                 return NULL;
 453         }
 454 #else
 455         if (!S_ISREG(s.st_mode))
 456                 return NULL;
 457 #endif
 458
 459         if ((fp = claws_fopen(file, "rb")) == NULL) {
 460                 FILE_OP_ERROR(file, "claws_fopen");
 461                 return NULL;
 462         }
 463
 464         msginfo = procheader_parse_stream(fp, flags, full, decrypted);
 465         claws_fclose(fp);
 466
 467         if (msginfo) {
 468 #ifdef G_OS_WIN32
 469                 msginfo->size = g_file_info_get_size(fi);
 470                 g_file_info_get_modification_time(fi, &tv);
 471                 msginfo->mtime = tv.tv_sec;
 472 #else
 473                 msginfo->size = s.st_size;
 474                 msginfo->mtime = s.st_mtime;
 475 #endif
 476         }
 477
 478 #ifdef G_OS_WIN32
 479         g_object_unref(fi);
 480         g_object_unref(f);
 481 #endif
 482
 483         return msginfo;
 484 }
 485
 486 MsgInfo *procheader_parse_str(const gchar *str, MsgFlags flags, gboolean full,
 487                               gboolean decrypted)
 488 {
 489         return parse_stream(&str, TRUE, flags, full, decrypted);
 490 }
 491
 492 enum
 493 {
 494         H_DATE = 0,
 495         H_FROM,
 496         H_TO,
 497         H_CC,
 498         H_NEWSGROUPS,
 499         H_SUBJECT,
 500         H_MSG_ID,
 501         H_REFERENCES,
 502         H_IN_REPLY_TO,
 503         H_CONTENT_TYPE,
 504         H_SEEN,
 505         H_STATUS,
 506         H_FROM_SPACE,
 507         H_SC_PLANNED_DOWNLOAD,
 508         H_SC_MESSAGE_SIZE,
 509         H_FACE,
 510         H_X_FACE,
 511         H_DISPOSITION_NOTIFICATION_TO,
 512         H_RETURN_RECEIPT_TO,
 513         H_SC_PARTIALLY_RETRIEVED,
 514         H_SC_ACCOUNT_SERVER,
 515         H_SC_ACCOUNT_LOGIN,
 516         H_LIST_POST,
 517         H_LIST_SUBSCRIBE,
 518         H_LIST_UNSUBSCRIBE,
 519         H_LIST_HELP,
 520         H_LIST_ARCHIVE,
 521         H_LIST_OWNER,
 522         H_RESENT_FROM,
 523 };
 524
 525 static HeaderEntry hentry_full[] = {
 526                                    {"Date:",            NULL, FALSE},
 527                                    {"From:",            NULL, TRUE},
 528                                    {"To:",              NULL, TRUE},
 529                                    {"Cc:",              NULL, TRUE},
 530                                    {"Newsgroups:",      NULL, TRUE},
 531                                    {"Subject:",         NULL, TRUE},
 532                                    {"Message-ID:",      NULL, FALSE},
 533                                    {"References:",      NULL, FALSE},
 534                                    {"In-Reply-To:",     NULL, FALSE},
 535                                    {"Content-Type:",    NULL, FALSE},
 536                                    {"Seen:",            NULL, FALSE},
 537                                    {"Status:",          NULL, FALSE},
 538                                    {"From ",            NULL, FALSE},
 539                                    {"SC-Marked-For-Download:", NULL, FALSE},
 540                                    {"SC-Message-Size:", NULL, FALSE},
 541                                    {"Face:",            NULL, FALSE},
 542                                    {"X-Face:",          NULL, FALSE},
 543                                    {"Disposition-Notification-To:", NULL, FALSE},
 544                                    {"Return-Receipt-To:", NULL, FALSE},
 545                                    {"SC-Partially-Retrieved:", NULL, FALSE},
 546                                    {"SC-Account-Server:", NULL, FALSE},
 547                                    {"SC-Account-Login:",NULL, FALSE},
 548                                    {"List-Post:",       NULL, TRUE},
 549                                    {"List-Subscribe:",  NULL, TRUE},
 550                                    {"List-Unsubscribe:",NULL, TRUE},
 551                                    {"List-Help:",       NULL, TRUE},
 552                                    {"List-Archive:",    NULL, TRUE},
 553                                    {"List-Owner:",      NULL, TRUE},
 554                                    {"Resent-From:",     NULL, TRUE},
 555                                    {NULL,               NULL, FALSE}};
 556
 557 static HeaderEntry hentry_short[] = {
 558                                     {"Date:",           NULL, FALSE},
 559                                     {"From:",           NULL, TRUE},
 560                                     {"To:",             NULL, TRUE},
 561                                     {"Cc:",             NULL, TRUE},
 562                                     {"Newsgroups:",     NULL, TRUE},
 563                                     {"Subject:",        NULL, TRUE},
 564                                     {"Message-ID:",     NULL, FALSE},
 565                                     {"References:",     NULL, FALSE},
 566                                     {"In-Reply-To:",    NULL, FALSE},
 567                                     {"Content-Type:",   NULL, FALSE},
 568                                     {"Seen:",           NULL, FALSE},
 569                                     {"Status:",         NULL, FALSE},
 570                                     {"From ",           NULL, FALSE},
 571                                     {"SC-Marked-For-Download:", NULL, FALSE},
 572                                     {"SC-Message-Size:",NULL, FALSE},
 573                                     {NULL,              NULL, FALSE}};
 574
 575 static HeaderEntry* procheader_get_headernames(gboolean full)
 576 {
 577         return full ? hentry_full : hentry_short;
 578 }
 579
 580 MsgInfo *procheader_parse_stream(FILE *fp, MsgFlags flags, gboolean full,
 581                                  gboolean decrypted)
 582 {
 583         return parse_stream(fp, FALSE, flags, full, decrypted);
 584 }
 585
 586 static gboolean avatar_from_some_face(gpointer source, gpointer userdata)
 587 {
 588         AvatarCaptureData *acd = (AvatarCaptureData *)source;
 589
 590         if (*(acd->content) == '\0') /* won't be null, but may be empty */
 591                 return FALSE;
 592
 593         if (!strcmp(acd->header, hentry_full[H_FACE].name)) {
 594                 debug_print("avatar_from_some_face: found 'Face' header\n");
 595                 procmsg_msginfo_add_avatar(acd->msginfo, AVATAR_FACE, acd->content);
 596         }
 597 #if HAVE_LIBCOMPFACE
 598         else if (!strcmp(acd->header, hentry_full[H_X_FACE].name)) {
 599                 debug_print("avatar_from_some_face: found 'X-Face' header\n");
 600                 procmsg_msginfo_add_avatar(acd->msginfo, AVATAR_XFACE, acd->content);
 601         }
 602 #endif
 603         return FALSE;
 604 }
 605
 606 static gulong avatar_hook_id = HOOK_NONE;
 607
 608 static MsgInfo *parse_stream(void *data, gboolean isstring, MsgFlags flags,
 609                              gboolean full, gboolean decrypted)
 610 {
 611         MsgInfo *msginfo;
 612         gchar *buf = NULL;
 613         gchar *p, *tmp;
 614         gchar *hp;
 615         HeaderEntry *hentry;
 616         gint hnum;
 617         void *orig_data = data;
 618
 619         get_one_field_func get_one_field =
 620                 isstring ? (get_one_field_func)string_get_one_field
 621                          : (get_one_field_func)procheader_get_one_field;
 622
 623         hentry = procheader_get_headernames(full);
 624
 625         if (MSG_IS_QUEUED(flags) || MSG_IS_DRAFT(flags)) {
 626                 while (get_one_field(&buf, data, NULL) != -1) {
 627                         if ((!strncmp(buf, "X-Claws-End-Special-Headers: 1",
 628                                 strlen("X-Claws-End-Special-Headers:"))) ||
 629                             (!strncmp(buf, "X-Sylpheed-End-Special-Headers: 1",
 630                                 strlen("X-Sylpheed-End-Special-Headers:")))) {
 631                                 g_free(buf);
 632                                 buf = NULL;
 633                                 break;
 634                         }
 635                         /* from other mailers */
 636                         if (!strncmp(buf, "Date: ", 6)
 637                         ||  !strncmp(buf, "To: ", 4)
 638                         ||  !strncmp(buf, "From: ", 6)
 639                         ||  !strncmp(buf, "Subject: ", 9)) {
 640                                 if (isstring)
 641                                         data = orig_data;
 642                                 else
 643                                         rewind((FILE *)data);
 644                                 g_free(buf);
 645                                 buf = NULL;
 646                                 break;
 647                         }
 648                         g_free(buf);
 649                         buf = NULL;
 650                 }
 651         }
 652
 653         msginfo = procmsg_msginfo_new();
 654
 655         if (flags.tmp_flags || flags.perm_flags)
 656                 msginfo->flags = flags;
 657         else
 658                 MSG_SET_PERM_FLAGS(msginfo->flags, MSG_NEW | MSG_UNREAD);
 659
 660         msginfo->inreplyto = NULL;
 661
 662         if (avatar_hook_id == HOOK_NONE &&
 663             (prefs_common.enable_avatars && (AVATARS_ENABLE_CAPTURE || AVATARS_ENABLE_RENDER))) {
 664                 avatar_hook_id = hooks_register_hook(AVATAR_HEADER_UPDATE_HOOKLIST,
 665                                                      avatar_from_some_face, NULL);
 666         } else if (avatar_hook_id != HOOK_NONE &&
 667                    !(prefs_common.enable_avatars && AVATARS_ENABLE_CAPTURE)) {
 668                 hooks_unregister_hook(AVATAR_HEADER_UPDATE_HOOKLIST, avatar_hook_id);
 669                 avatar_hook_id = HOOK_NONE;
 670         }
 671
 672         while ((hnum = get_one_field(&buf, data, hentry)) != -1) {
 673                 hp = buf + strlen(hentry[hnum].name);
 674                 while (*hp == ' ' || *hp == '\t') hp++;
 675
 676                 switch (hnum) {
 677                 case H_DATE:
 678                         if (msginfo->date) break;
 679                         msginfo->date_t =
 680                                 procheader_date_parse(NULL, hp, 0);
 681                         if (g_utf8_validate(hp, -1, NULL)) {
 682                                 msginfo->date = g_strdup(hp);
 683                         } else {
 684                                 gchar *utf = conv_codeset_strdup(
 685                                         hp,
 686                                         conv_get_locale_charset_str_no_utf8(),
 687                                         CS_INTERNAL);
 688                                 if (utf == NULL ||
 689                                     !g_utf8_validate(utf, -1, NULL)) {
 690                                         g_free(utf);
 691                                         utf = g_malloc(strlen(buf)*2+1);
 692                                         conv_localetodisp(utf,
 693                                                 strlen(hp)*2+1, hp);
 694                                 }
 695                                 msginfo->date = utf;
 696                         }
 697                         break;
 698                 case H_FROM:
 699                         if (msginfo->from) break;
 700                         msginfo->from = conv_unmime_header(hp, NULL, TRUE);
 701                         msginfo->fromname = procheader_get_fromname(msginfo->from);
 702                         remove_return(msginfo->from);
 703                         remove_return(msginfo->fromname);
 704                         break;
 705                 case H_TO:
 706                         tmp = conv_unmime_header(hp, NULL, TRUE);
 707                         remove_return(tmp);
 708                         if (msginfo->to) {
 709                                 p = msginfo->to;
 710                                 msginfo->to =
 711                                         g_strconcat(p, ", ", tmp, NULL);
 712                                 g_free(p);
 713                         } else
 714                                 msginfo->to = g_strdup(tmp);
 715                         g_free(tmp);
 716                         break;
 717                 case H_CC:
 718                         tmp = conv_unmime_header(hp, NULL, TRUE);
 719                         remove_return(tmp);
 720                         if (msginfo->cc) {
 721                                 p = msginfo->cc;
 722                                 msginfo->cc =
 723                                         g_strconcat(p, ", ", tmp, NULL);
 724                                 g_free(p);
 725                         } else
 726                                 msginfo->cc = g_strdup(tmp);
 727                         g_free(tmp);
 728                         break;
 729                 case H_NEWSGROUPS:
 730                         if (msginfo->newsgroups) {
 731                                 p = msginfo->newsgroups;
 732                                 msginfo->newsgroups =
 733                                         g_strconcat(p, ",", hp, NULL);
 734                                 g_free(p);
 735                         } else
 736                                 msginfo->newsgroups = g_strdup(hp);
 737                         break;
 738                 case H_SUBJECT:
 739                         if (msginfo->subject) break;
 740                         msginfo->subject = conv_unmime_header(hp, NULL, FALSE);
 741                         unfold_line(msginfo->subject);
 742                        break;
 743                 case H_MSG_ID:
 744                         if (msginfo->msgid) break;
 745
 746                         extract_parenthesis(hp, '<', '>');
 747                         remove_space(hp);
 748                         msginfo->msgid = g_strdup(hp);
 749                         break;
 750                 case H_REFERENCES:
 751                         msginfo->references =
 752                                 references_list_prepend(msginfo->references,
 753                                                         hp);
 754                         break;
 755                 case H_IN_REPLY_TO:
 756                         if (msginfo->inreplyto) break;
 757
 758                         eliminate_parenthesis(hp, '(', ')');
 759                         if ((p = strrchr(hp, '<')) != NULL &&
 760                             strchr(p + 1, '>') != NULL) {
 761                                 extract_parenthesis(p, '<', '>');
 762                                 remove_space(p);
 763                                 if (*p != '\0')
 764                                         msginfo->inreplyto = g_strdup(p);
 765                         }
 766                         break;
 767                 case H_CONTENT_TYPE:
 768                         if (!g_ascii_strncasecmp(hp, "multipart/", 10))
 769                                 MSG_SET_TMP_FLAGS(msginfo->flags, MSG_MULTIPART);
 770                         break;
 771                 case H_DISPOSITION_NOTIFICATION_TO:
 772                         if (!msginfo->extradata)
 773                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 774                         if (msginfo->extradata->dispositionnotificationto) break;
 775                         msginfo->extradata->dispositionnotificationto = g_strdup(hp);
 776                         break;
 777                 case H_RETURN_RECEIPT_TO:
 778                         if (!msginfo->extradata)
 779                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 780                         if (msginfo->extradata->returnreceiptto) break;
 781                         msginfo->extradata->returnreceiptto = g_strdup(hp);
 782                         break;
 783 /* partial download infos */
 784                 case H_SC_PARTIALLY_RETRIEVED:
 785                         if (!msginfo->extradata)
 786                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 787                         if (msginfo->extradata->partial_recv) break;
 788                         msginfo->extradata->partial_recv = g_strdup(hp);
 789                         break;
 790                 case H_SC_ACCOUNT_SERVER:
 791                         if (!msginfo->extradata)
 792                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 793                         if (msginfo->extradata->account_server) break;
 794                         msginfo->extradata->account_server = g_strdup(hp);
 795                         break;
 796                 case H_SC_ACCOUNT_LOGIN:
 797                         if (!msginfo->extradata)
 798                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 799                         if (msginfo->extradata->account_login) break;
 800                         msginfo->extradata->account_login = g_strdup(hp);
 801                         break;
 802                 case H_SC_MESSAGE_SIZE:
 803                         if (msginfo->total_size) break;
 804                         msginfo->total_size = atoi(hp);
 805                         break;
 806                 case H_SC_PLANNED_DOWNLOAD:
 807                         msginfo->planned_download = atoi(hp);
 808                         break;
 809 /* end partial download infos */
 810                 case H_FROM_SPACE:
 811                         if (msginfo->fromspace) break;
 812                         msginfo->fromspace = g_strdup(hp);
 813                         remove_return(msginfo->fromspace);
 814                         break;
 815 /* list infos */
 816                 case H_LIST_POST:
 817                         if (!msginfo->extradata)
 818                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 819                         if (msginfo->extradata->list_post) break;
 820                         msginfo->extradata->list_post = g_strdup(hp);
 821                         break;
 822                 case H_LIST_SUBSCRIBE:
 823                         if (!msginfo->extradata)
 824                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 825                         if (msginfo->extradata->list_subscribe) break;
 826                         msginfo->extradata->list_subscribe = g_strdup(hp);
 827                         break;
 828                 case H_LIST_UNSUBSCRIBE:
 829                         if (!msginfo->extradata)
 830                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 831                         if (msginfo->extradata->list_unsubscribe) break;
 832                         msginfo->extradata->list_unsubscribe = g_strdup(hp);
 833                         break;
 834                 case H_LIST_HELP:
 835                         if (!msginfo->extradata)
 836                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 837                         if (msginfo->extradata->list_help) break;
 838                         msginfo->extradata->list_help = g_strdup(hp);
 839                         break;
 840                 case H_LIST_ARCHIVE:
 841                         if (!msginfo->extradata)
 842                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 843                         if (msginfo->extradata->list_archive) break;
 844                         msginfo->extradata->list_archive = g_strdup(hp);
 845                         break;
 846                 case H_LIST_OWNER:
 847                         if (!msginfo->extradata)
 848                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 849                         if (msginfo->extradata->list_owner) break;
 850                         msginfo->extradata->list_owner = g_strdup(hp);
 851                         break;
 852                 case H_RESENT_FROM:
 853                         if (!msginfo->extradata)
 854                                 msginfo->extradata = g_new0(MsgInfoExtraData, 1);
 855                         if (msginfo->extradata->resent_from) break;
 856                         msginfo->extradata->resent_from = g_strdup(hp);
 857                         break;
 858 /* end list infos */
 859                 default:
 860                         break;
 861                 }
 862                 /* to avoid performance penalty hooklist is invoked only for
 863                    headers known to be able to generate avatars */
 864                 if (hnum == H_FROM || hnum == H_X_FACE || hnum == H_FACE) {
 865                         AvatarCaptureData *acd = g_new0(AvatarCaptureData, 1);
 866                         /* no extra memory is wasted, hooks are expected to
 867                            take care of copying members when needed */
 868                         acd->msginfo = msginfo;
 869                         acd->header  = hentry_full[hnum].name;
 870                         acd->content = hp;
 871                         hooks_invoke(AVATAR_HEADER_UPDATE_HOOKLIST, (gpointer)acd);
 872                         g_free(acd);
 873                 }
 874                 g_free(buf);
 875                 buf = NULL;
 876         }
 877
 878         if (!msginfo->inreplyto && msginfo->references)
 879                 msginfo->inreplyto =
 880                         g_strdup((gchar *)msginfo->references->data);
 881
 882         return msginfo;
 883 }
 884
 885 gchar *procheader_get_fromname(const gchar *str)
 886 {
 887         gchar *tmp, *name;
 888
 889         Xstrdup_a(tmp, str, return NULL);
 890
 891         if (*tmp == '\"') {
 892                 extract_quote(tmp, '\"');
 893                 g_strstrip(tmp);
 894         } else if (strchr(tmp, '<')) {
 895                 eliminate_parenthesis(tmp, '<', '>');
 896                 g_strstrip(tmp);
 897                 if (*tmp == '\0') {
 898                         strcpy(tmp, str);
 899                         extract_parenthesis(tmp, '<', '>');
 900                         g_strstrip(tmp);
 901                 }
 902         } else if (strchr(tmp, '(')) {
 903                 extract_parenthesis(tmp, '(', ')');
 904                 g_strstrip(tmp);
 905         }
 906
 907         if (*tmp == '\0')
 908                 name = g_strdup(str);
 909         else
 910                 name = g_strdup(tmp);
 911
 912         return name;
 913 }
 914
 915 static gint procheader_scan_date_string(const gchar *str,
 916                                         gchar *weekday, gint *day,
 917                                         gchar *month, gint *year,
 918                                         gint *hh, gint *mm, gint *ss,
 919                                         gchar *zone)
 920 {
 921         gint result;
 922         gint month_n;
 923         gint secfract;
 924         gint zone1 = 0, zone2 = 0;
 925         gchar offset_sign, zonestr[7];
 926         gchar sep1;
 927
 928         if (str == NULL)
 929                 return -1;
 930
 931         result = sscanf(str, "%10s %d %9s %d %2d:%2d:%2d %6s",
 932                         weekday, day, month, year, hh, mm, ss, zone);
 933         if (result == 8) return 0;
 934
 935         /* RFC2822 */
 936         result = sscanf(str, "%3s,%d %9s %d %2d:%2d:%2d %6s",
 937                         weekday, day, month, year, hh, mm, ss, zone);
 938         if (result == 8) return 0;
 939
 940         result = sscanf(str, "%3s %3s %d %2d:%2d:%2d %d %6s",
 941                         weekday, month, day, hh, mm, ss, year, zone);
 942         if (result == 8) return 0;
 943
 944         result = sscanf(str, "%d %9s %d %2d:%2d:%2d %6s",
 945                         day, month, year, hh, mm, ss, zone);
 946         if (result == 7) return 0;
 947
 948         *zone = '\0';
 949         result = sscanf(str, "%10s %d %9s %d %2d:%2d:%2d",
 950                         weekday, day, month, year, hh, mm, ss);
 951         if (result == 7) return 0;
 952
 953         result = sscanf(str, "%3s %3s %d %2d:%2d:%2d %d",
 954                         weekday, month, day, hh, mm, ss, year);
 955         if (result == 7) return 0;
 956
 957         result = sscanf(str, "%d %9s %d %2d:%2d:%2d",
 958                         day, month, year, hh, mm, ss);
 959         if (result == 6) return 0;
 960
 961         *ss = 0;
 962         result = sscanf(str, "%10s %d %9s %d %2d:%2d %6s",
 963                         weekday, day, month, year, hh, mm, zone);
 964         if (result == 7) return 0;
 965
 966         result = sscanf(str, "%d %9s %d %2d:%2d %5s",
 967                         day, month, year, hh, mm, zone);
 968         if (result == 6) return 0;
 969
 970         *zone = '\0';
 971         result = sscanf(str, "%10s %d %9s %d %2d:%2d",
 972                         weekday, day, month, year, hh, mm);
 973         if (result == 6) return 0;
 974
 975         result = sscanf(str, "%d %9s %d %2d:%2d",
 976                         day, month, year, hh, mm);
 977         if (result == 5) return 0;
 978
 979         *weekday = '\0';
 980
 981         /* RFC3339 subset, with fraction of second */
 982         result = sscanf(str, "%4d-%2d-%2d%c%2d:%2d:%2d.%d%6s",
 983                         year, &month_n, day, &sep1, hh, mm, ss, &secfract, zonestr);
 984         if (result == 9
 985                         && (sep1 == 'T' || sep1 == 't' || sep1 == ' ')) {
 986                 if (month_n >= 1 && month_n <= 12) {
 987                         strncpy2(month, monthstr+((month_n-1)*3), 4);
 988                         if (zonestr[0] == 'z' || zonestr[0] == 'Z') {
 989                                 strcat(zone, "+00:00");
 990                         } else if (sscanf(zonestr, "%c%2d:%2d",
 991                                                 &offset_sign, &zone1, &zone2) == 3) {
 992                                 strcat(zone, zonestr);
 993                         }
 994                         return 0;
 995                 }
 996         }
 997
 998         /* RFC3339 subset, no fraction of second */
 999         result = sscanf(str, "%4d-%2d-%2d%c%2d:%2d:%2d%6s",
1000                         year, &month_n, day, &sep1, hh, mm, ss, zonestr);
1001         if (result == 8
1002                         && (sep1 == 'T' || sep1 == 't' || sep1 == ' ')) {
1003                 if (month_n >= 1 && month_n <= 12) {
1004                         strncpy2(month, monthstr+((month_n-1)*3), 4);
1005                         if (zonestr[0] == 'z' || zonestr[0] == 'Z') {
1006                                 strcat(zone, "+00:00");
1007                         } else if (sscanf(zonestr, "%c%2d:%2d",
1008                                                 &offset_sign, &zone1, &zone2) == 3) {
1009                                 strcat(zone, zonestr);
1010                         }
1011                         return 0;
1012                 }
1013         }
1014
1015         *zone = '\0';
1016
1017         /* RFC3339 subset, no fraction of second, and no timezone offset */
1018         /* This particular "subset" is invalid, RFC requires the offset */
1019         result = sscanf(str, "%4d-%2d-%2d %2d:%2d:%2d",
1020                         year, &month_n, day, hh, mm, ss);
1021         if (result == 6) {
1022                 if (1 <= month_n && month_n <= 12) {
1023                         strncpy2(month, monthstr+((month_n-1)*3), 4);
1024                         return 0;
1025                 }
1026         }
1027
1028         /* ISO8601 format with just date (YYYY-MM-DD) */
1029         result = sscanf(str, "%4d-%2d-%2d",
1030                         year, &month_n, day);
1031         if (result == 3) {
1032                 *hh = *mm = *ss = 0;
1033                 if (1 <= month_n && month_n <= 12) {
1034                         strncpy2(month, monthstr+((month_n-1)*3), 4);
1035                         return 0;
1036                 }
1037         }
1038
1039         return -1;
1040 }
1041
1042 /*
1043  * Hiro, most UNIXen support this function:
1044  * http://www.mcsr.olemiss.edu/cgi-bin/man-cgi?getdate
1045  */
1046 gboolean procheader_date_parse_to_tm(const gchar *src, struct tm *t, char *zone)
1047 {
1048         gchar weekday[11];
1049         gint day;
1050         gchar month[10];
1051         gint year;
1052         gint hh, mm, ss;
1053         GDateMonth dmonth;
1054         gchar *p;
1055
1056         if (!t)
1057                 return FALSE;
1058
1059         memset(t, 0, sizeof *t);
1060
1061         if (procheader_scan_date_string(src, weekday, &day, month, &year,
1062                                         &hh, &mm, &ss, zone) < 0) {
1063                 g_warning("invalid date: %s", src);
1064                 return FALSE;
1065         }
1066
1067         /* Y2K compliant :) */
1068         if (year < 100) {
1069                 if (year < 70)
1070                         year += 2000;
1071                 else
1072                         year += 1900;
1073         }
1074
1075         month[3] = '\0';
1076         if ((p = strstr(monthstr, month)) != NULL)
1077                 dmonth = (gint)(p - monthstr) / 3 + 1;
1078         else {
1079                 g_warning("invalid month: %s", month);
1080                 dmonth = G_DATE_BAD_MONTH;
1081         }
1082
1083         t->tm_sec = ss;
1084         t->tm_min = mm;
1085         t->tm_hour = hh;
1086         t->tm_mday = day;
1087         t->tm_mon = dmonth - 1;
1088         t->tm_year = year - 1900;
1089         t->tm_wday = 0;
1090         t->tm_yday = 0;
1091         t->tm_isdst = -1;
1092
1093         mktime(t);
1094
1095         return TRUE;
1096 }
1097
1098 time_t procheader_date_parse(gchar *dest, const gchar *src, gint len)
1099 {
1100         gchar weekday[11];
1101         gint day;
1102         gchar month[10];
1103         gint year;
1104         gint hh, mm, ss;
1105         gchar zone[7];
1106         GDateMonth dmonth = G_DATE_BAD_MONTH;
1107         gchar *p;
1108         time_t timer;
1109
1110         if (procheader_scan_date_string(src, weekday, &day, month, &year,
1111                                         &hh, &mm, &ss, zone) < 0) {
1112                 if (dest && len > 0)
1113                         strncpy2(dest, src, len);
1114                 return 0;
1115         }
1116
1117         month[3] = '\0';
1118         for (p = monthstr; *p != '\0'; p += 3) {
1119                 if (!g_ascii_strncasecmp(p, month, 3)) {
1120                         dmonth = (gint)(p - monthstr) / 3 + 1;
1121                         break;
1122                 }
1123         }
1124
1125 #ifdef G_OS_WIN32
1126         GTimeZone *tz;
1127         GDateTime *dt, *dt2;
1128
1129 #if GLIB_CHECK_VERSION(2,68,0)
1130         tz = g_time_zone_new_identifier(zone);
1131         if (tz == NULL)
1132                 tz = g_time_zone_new_utc();
1133 #else
1134         tz = g_time_zone_new(zone); // can't return NULL no need to check for it
1135 #endif
1136         dt = g_date_time_new(tz, 1, 1, 1, 0, 0, 0);
1137         g_time_zone_unref(tz);
1138         dt2 = g_date_time_add_full(dt, year-1, dmonth-1, day-1, hh, mm, ss);
1139         g_date_time_unref(dt);
1140
1141         timer = g_date_time_to_unix(dt2);
1142         g_date_time_unref(dt2);
1143
1144 #else
1145         struct tm t;
1146         time_t tz_offset;
1147
1148         /* Y2K compliant :) */
1149         if (year < 1000) {
1150                 if (year < 50)
1151                         year += 2000;
1152                 else
1153                         year += 1900;
1154         }
1155
1156         t.tm_sec = ss;
1157         t.tm_min = mm;
1158         t.tm_hour = hh;
1159         t.tm_mday = day;
1160         t.tm_mon = dmonth - 1;
1161         t.tm_year = year - 1900;
1162         t.tm_wday = 0;
1163         t.tm_yday = 0;
1164         t.tm_isdst = -1;
1165
1166         timer = mktime(&t);
1167         tz_offset = remote_tzoffset_sec(zone);
1168         if (tz_offset != -1)
1169                 timer += tzoffset_sec(&timer) - tz_offset;
1170
1171 #endif
1172         if (dest)
1173                 procheader_date_get_localtime(dest, len, timer);
1174
1175         return timer;
1176 }
1177
1178 void procheader_date_get_localtime(gchar *dest, gint len, const time_t timer)
1179 {
1180         struct tm *lt;
1181         gchar *default_format = "%y/%m/%d(%a) %H:%M";
1182         gchar *str;
1183         const gchar *src_codeset, *dest_codeset;
1184         struct tm buf;
1185
1186         if (timer > 0)
1187                 lt = localtime_r(&timer, &buf);
1188         else {
1189                 time_t dummy = 1;
1190                 lt = localtime_r(&dummy, &buf);
1191         }
1192
1193         if (prefs_common.date_format)
1194                 fast_strftime(dest, len, prefs_common.date_format, lt);
1195         else
1196                 fast_strftime(dest, len, default_format, lt);
1197
1198         if (!g_utf8_validate(dest, -1, NULL)) {
1199                 src_codeset = conv_get_locale_charset_str_no_utf8();
1200                 dest_codeset = CS_UTF_8;
1201                 str = conv_codeset_strdup(dest, src_codeset, dest_codeset);
1202                 if (str) {
1203                         strncpy2(dest, str, len);
1204                         g_free(str);
1205                 }
1206         }
1207 }
1208
1209 /* Added by Mel Hadasht on 27 Aug 2001 */
1210 /* Get a header from msginfo */
1211 gint procheader_get_header_from_msginfo(MsgInfo *msginfo, gchar **buf, gchar *header)
1212 {
1213         gchar *file;
1214         FILE *fp;
1215         HeaderEntry hentry[]={ { NULL, NULL, TRUE  },
1216                                                    { NULL, NULL, FALSE } };
1217         gint val;
1218
1219         cm_return_val_if_fail(msginfo != NULL, -1);
1220         cm_return_val_if_fail(buf != NULL, -1);
1221         cm_return_val_if_fail(header != NULL, -1);
1222
1223         hentry[0].name = header;
1224
1225         file = procmsg_get_message_file_path(msginfo);
1226         if ((fp = claws_fopen(file, "rb")) == NULL) {
1227                 FILE_OP_ERROR(file, "claws_fopen");
1228                 g_free(file);
1229                 g_free(*buf);
1230                 *buf = NULL;
1231                 return -1;
1232         }
1233         val = procheader_get_one_field(buf, fp, hentry);
1234
1235         if (claws_fclose(fp) == EOF) {
1236                 FILE_OP_ERROR(file, "claws_fclose");
1237                 claws_unlink(file);
1238                 g_free(file);
1239                 g_free(*buf);
1240                 *buf = NULL;
1241                 return -1;
1242         }
1243
1244         g_free(file);
1245         if (val == -1) {
1246                 /* *buf is already NULL in that case, see procheader_get_one_field() */
1247                 return -1;
1248         }
1249
1250         return 0;
1251 }
1252
1253 HeaderEntry *procheader_entries_from_str(const gchar *str)
1254 {
1255         HeaderEntry *entries = NULL, *he;
1256         int numh = 0, i = 0;
1257         gchar **names = NULL;
1258         const gchar *s = str;
1259
1260         if (s == NULL) {
1261                 return NULL;
1262         }
1263         while (*s != '\0') {
1264                 if (*s == ' ') ++numh;
1265                 ++s;
1266         }
1267         if (numh == 0) {
1268                 return NULL;
1269         }
1270         entries = g_new0(HeaderEntry, numh + 1); /* room for last NULL */
1271         s = str;
1272         ++s; /* skip first space */
1273         names = g_strsplit(s, " ", numh);
1274         he = entries;
1275         while (names[i]) {
1276                 he->name = g_strdup_printf("%s:", names[i]);
1277                 he->body = NULL;
1278                 he->unfold = FALSE;
1279                 ++i, ++he;
1280         }
1281         he->name = NULL;
1282         g_strfreev(names);
1283         return entries;
1284 }
1285
1286 void procheader_entries_free (HeaderEntry *entries)
1287 {
1288         if (entries != NULL) {
1289                 HeaderEntry *he = entries;
1290                 while (he->name != NULL) {
1291                         g_free(he->name);
1292                         if (he->body != NULL)
1293                                 g_free(he->body);
1294                         ++he;
1295                 }
1296                 g_free(entries);
1297         }
1298 }
1299
1300 gboolean procheader_header_is_internal(const gchar *hdr_name)
1301 {
1302         const gchar *internal_hdrs[] = {
1303                 "AF:", "NF:", "PS:", "SRH:", "SFN:", "DSR:", "MID:", "CFG:",
1304                 "PT:", "S:", "RQ:", "SSV:", "NSV:", "SSH:", "R:", "MAID:",
1305                 "SCF:", "RMID:", "FMID:", "NAID:",
1306                 "X-Claws-Account-Id:",
1307                 "X-Claws-Sign:",
1308                 "X-Claws-Encrypt:",
1309                 "X-Claws-Privacy-System:",
1310                 "X-Claws-Auto-Wrapping:",
1311                 "X-Claws-Auto-Indent:",
1312                 "X-Claws-End-Special-Headers:",
1313                 "X-Sylpheed-Account-Id:",
1314                 "X-Sylpheed-Sign:",
1315                 "X-Sylpheed-Encrypt:",
1316                 "X-Sylpheed-Privacy-System:",
1317                 "X-Sylpheed-End-Special-Headers:",
1318                  NULL
1319         };
1320         int i;
1321
1322         for (i = 0; internal_hdrs[i]; i++) {
1323                 if (!strcmp(hdr_name, internal_hdrs[i]))
1324                         return TRUE;
1325         }
1326         return FALSE;
1327 }