src/procheader.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2001 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 2 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, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #include <glib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #include <time.h>
  29
  30 #include "intl.h"
  31 #include "procheader.h"
  32 #include "procmsg.h"
  33 #include "codeconv.h"
  34 #include "prefs_common.h"
  35 #include "utils.h"
  36
  37 #define BUFFSIZE        8192
  38
  39 /*
  40   procheader_get_one_field
  41   - reads fp and puts the header and the corresponding content into buf
  42     if one of these is one of hentry table.
  43   - if hentry is NULL, ignores no headers
  44  */
  45
  46 gint procheader_get_one_field(gchar *buf, gint len, FILE *fp,
  47                               HeaderEntry hentry[])
  48 {
  49         gint nexthead;
  50         gint hnum = 0;
  51         HeaderEntry *hp = NULL;
  52
  53         if (hentry != NULL) {
  54                 /* skip non-required headers */
  55                 do {
  56                         do {
  57                                 if (fgets(buf, len, fp) == NULL)
  58                                         return -1;
  59                                 if (buf[0] == '\r' || buf[0] == '\n')
  60                                         return -1;
  61                         } while (buf[0] == ' ' || buf[0] == '\t');
  62
  63                         for (hp = hentry, hnum = 0; hp->name != NULL;
  64                              hp++, hnum++) {
  65                                 if (!strncasecmp(hp->name, buf,
  66                                                  strlen(hp->name)))
  67                                         break;
  68                         }
  69                 } while (hp->name == NULL);
  70         } else {
  71                 if (fgets(buf, len, fp) == NULL) return -1;
  72                 if (buf[0] == '\r' || buf[0] == '\n') return -1;
  73         }
  74
  75         /* unfold the specified folded line */
  76         if (hp && hp->unfold) {
  77                 gboolean folded = FALSE;
  78                 gchar *bufp = buf + strlen(buf);
  79
  80                 while (1) {
  81                         nexthead = fgetc(fp);
  82
  83                         /* folded */
  84                         if (nexthead == ' ' || nexthead == '\t')
  85                                 folded = TRUE;
  86                         else if (nexthead == EOF)
  87                                 break;
  88                         else if (folded == TRUE) {
  89                                 /* concatenate next line */
  90                                 if ((len - (bufp - buf)) <= 2) break;
  91
  92                                 /* replace return code on the tail end
  93                                    with space */
  94                                 *(bufp - 1) = ' ';
  95                                 *bufp++ = nexthead;
  96                                 *bufp = '\0';
  97                                 if (nexthead == '\r' || nexthead == '\n') {
  98                                         folded = FALSE;
  99                                         continue;
 100                                 }
 101                                 if (fgets(bufp, len - (bufp - buf), fp)
 102                                     == NULL) break;
 103                                 bufp += strlen(bufp);
 104
 105                                 folded = FALSE;
 106                         } else {
 107                                 ungetc(nexthead, fp);
 108                                 break;
 109                         }
 110                 }
 111
 112                 /* remove trailing return code */
 113                 strretchomp(buf);
 114
 115                 return hnum;
 116         }
 117
 118         while (1) {
 119                 nexthead = fgetc(fp);
 120                 if (nexthead == ' ' || nexthead == '\t') {
 121                         size_t buflen = strlen(buf);
 122
 123                         /* concatenate next line */
 124                         if ((len - buflen) > 2) {
 125                                 gchar *p = buf + buflen;
 126
 127                                 *p++ = nexthead;
 128                                 *p = '\0';
 129                                 buflen++;
 130                                 if (fgets(p, len - buflen, fp) == NULL)
 131                                         break;
 132                         } else
 133                                 break;
 134                 } else {
 135                         if (nexthead != EOF)
 136                                 ungetc(nexthead, fp);
 137                         break;
 138                 }
 139         }
 140
 141         /* remove trailing return code */
 142         strretchomp(buf);
 143
 144         return hnum;
 145 }
 146
 147 gchar *procheader_get_unfolded_line(gchar *buf, gint len, FILE *fp)
 148 {
 149         gboolean folded = FALSE;
 150         gint nexthead;
 151         gchar *bufp;
 152
 153         if (fgets(buf, len, fp) == NULL) return NULL;
 154         if (buf[0] == '\r' || buf[0] == '\n') return NULL;
 155         bufp = buf + strlen(buf);
 156
 157         while (1) {
 158                 nexthead = fgetc(fp);
 159
 160                 /* folded */
 161                 if (nexthead == ' ' || nexthead == '\t')
 162                         folded = TRUE;
 163                 else if (nexthead == EOF)
 164                         break;
 165                 else if (folded == TRUE) {
 166                         /* concatenate next line */
 167                         if ((len - (bufp - buf)) <= 2) break;
 168
 169                         /* replace return code on the tail end
 170                            with space */
 171                         *(bufp - 1) = ' ';
 172                         *bufp++ = nexthead;
 173                         *bufp = '\0';
 174                         if (nexthead == '\r' || nexthead == '\n') {
 175                                 folded = FALSE;
 176                                 continue;
 177                         }
 178                         if (fgets(bufp, len - (bufp - buf), fp)
 179                             == NULL) break;
 180                         bufp += strlen(bufp);
 181
 182                         folded = FALSE;
 183                 } else {
 184                         ungetc(nexthead, fp);
 185                         break;
 186                 }
 187         }
 188
 189         /* remove trailing return code */
 190         strretchomp(buf);
 191
 192         return buf;
 193 }
 194
 195 /*
 196   tests whether two headers' names are equal
 197   remove the trailing ':' or ' ' before comparing
 198 */
 199
 200 gboolean procheader_headername_equal(char * hdr1, char * hdr2)
 201 {
 202         int len1;
 203         int len2;
 204
 205         len1 = strlen(hdr1);
 206         len2 = strlen(hdr2);
 207         if ((hdr1[len1 - 1] == ':') || (hdr1[len1 - 1] == ' '))
 208                 len1--;
 209         if ((hdr2[len2 - 1] == ':') || (hdr2[len2 - 1] == ' '))
 210                 len2--;
 211         if (len1 != len2)
 212                 return 0;
 213         return (strncasecmp(hdr1, hdr2, len1) == 0);
 214 }
 215
 216 void procheader_header_free(Header * header)
 217 {
 218         g_free(header->name);
 219         g_free(header->body);
 220         g_free(header);
 221 }
 222
 223 /*
 224   parse headers, for example :
 225   From: dinh@enseirb.fr becomes :
 226   header->name = "From:"
 227   header->body = "dinh@enseirb.fr"
 228  */
 229
 230 Header * procheader_parse_header(gchar * buf)
 231 {
 232         gchar tmp[BUFFSIZE];
 233         gchar *p = buf;
 234         Header * header;
 235
 236         if ((*buf == ':') || (*buf == ' '))
 237                 return NULL;
 238
 239         for (p = buf; *p ; p++) {
 240                 if ((*p == ':') || (*p == ' ')) {
 241                         header = g_new(Header, 1);
 242                         header->name = g_strndup(buf, p - buf + 1);
 243                         p++;
 244                         while (*p == ' ' || *p == '\t') p++;
 245                         conv_unmime_header(tmp, sizeof(tmp), p, NULL);
 246                         header->body = g_strdup(tmp);
 247                         return header;
 248                 }
 249         }
 250         return NULL;
 251 }
 252
 253 GSList *procheader_get_header_list(const gchar *file)
 254 {
 255         FILE *fp;
 256         gchar buf[BUFFSIZE], tmp[BUFFSIZE];
 257         gchar *p;
 258         GSList *hlist = NULL;
 259         Header *header;
 260
 261         if ((fp = fopen(file, "r")) == NULL) {
 262                 FILE_OP_ERROR(file, "fopen");
 263                 return NULL;
 264         }
 265
 266         while (procheader_get_unfolded_line(buf, sizeof(buf), fp) != NULL) {
 267                 header = procheader_parse_header(buf);
 268                 if (header != NULL)
 269                         hlist = g_slist_append(hlist, header);
 270         }
 271
 272         fclose(fp);
 273         return hlist;
 274 }
 275
 276 void procheader_header_list_destroy(GSList *hlist)
 277 {
 278         Header *header;
 279
 280         while (hlist != NULL) {
 281                 header = hlist->data;
 282
 283                 procheader_header_free(header);
 284                 hlist = g_slist_remove(hlist, header);
 285         }
 286 }
 287
 288 void procheader_get_header_fields(FILE *fp, HeaderEntry hentry[])
 289 {
 290         gchar buf[BUFFSIZE];
 291         HeaderEntry *hp;
 292         gint hnum;
 293         gchar *p;
 294
 295         if (hentry == NULL) return;
 296
 297         while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, hentry))
 298                != -1) {
 299                 hp = hentry + hnum;
 300
 301                 p = buf + strlen(hp->name);
 302                 while (*p == ' ' || *p == '\t') p++;
 303
 304                 if (hp->body == NULL)
 305                         hp->body = g_strdup(p);
 306                 else if (!strcasecmp(hp->name, "To:") ||
 307                          !strcasecmp(hp->name, "Cc:")) {
 308                         gchar *tp = hp->body;
 309                         hp->body = g_strconcat(tp, ", ", p, NULL);
 310                         g_free(tp);
 311                 }
 312         }
 313 }
 314
 315 enum
 316 {
 317         H_DATE          = 0,
 318         H_FROM          = 1,
 319         H_TO            = 2,
 320         H_CC            = 3,
 321         H_NEWSGROUPS    = 4,
 322         H_SUBJECT       = 5,
 323         H_MSG_ID        = 6,
 324         H_REFERENCES    = 7,
 325         H_IN_REPLY_TO   = 8,
 326         H_CONTENT_TYPE  = 9,
 327         H_SEEN          = 10,
 328         H_X_FACE        = 11,
 329         H_DISPOSITION_NOTIFICATION_TO = 12
 330 };
 331
 332 MsgInfo *procheader_parse(const gchar *file, MsgFlags flags, gboolean full)
 333 {
 334         static HeaderEntry hentry_full[] = {{"Date:",           NULL, FALSE},
 335                                            {"From:",            NULL, TRUE},
 336                                            {"To:",              NULL, TRUE},
 337                                            {"Cc:",              NULL, TRUE},
 338                                            {"Newsgroups:",      NULL, TRUE},
 339                                            {"Subject:",         NULL, TRUE},
 340                                            {"Message-Id:",      NULL, FALSE},
 341                                            {"References:",      NULL, FALSE},
 342                                            {"In-Reply-To:",     NULL, FALSE},
 343                                            {"Content-Type:",    NULL, FALSE},
 344                                            {"Seen:",            NULL, FALSE},
 345                                            {"X-Face:",          NULL, FALSE},
 346                                            {"Disposition-Notification-To:",NULL, FALSE},
 347                                            {NULL,               NULL, FALSE}};
 348
 349         static HeaderEntry hentry_short[] = {{"Date:",          NULL, FALSE},
 350                                             {"From:",           NULL, TRUE},
 351                                             {"To:",             NULL, TRUE},
 352                                             {"Cc:",             NULL, TRUE},
 353                                             {"Newsgroups:",     NULL, TRUE},
 354                                             {"Subject:",        NULL, TRUE},
 355                                             {"Message-Id:",     NULL, FALSE},
 356                                             {"References:",     NULL, FALSE},
 357                                             {"In-Reply-To:",    NULL, FALSE},
 358                                             {"Content-Type:",   NULL, FALSE},
 359                                             {"Seen:",           NULL, FALSE},
 360                                             {NULL,              NULL, FALSE}};
 361
 362         FILE *fp;
 363         MsgInfo *msginfo;
 364         gchar buf[BUFFSIZE], tmp[BUFFSIZE];
 365         gchar *reference = NULL;
 366         gchar *p;
 367         gchar *hp;
 368         HeaderEntry *hentry;
 369         gint hnum;
 370
 371         hentry = full ? hentry_full : hentry_short;
 372
 373         if ((fp = fopen(file, "r")) == NULL) {
 374                 FILE_OP_ERROR(file, "fopen");
 375                 return NULL;
 376         }
 377         if (MSG_IS_QUEUED(flags)) {
 378                 while (fgets(buf, sizeof(buf), fp) != NULL)
 379                         if (buf[0] == '\r' || buf[0] == '\n') break;
 380         }
 381
 382         msginfo = g_new0(MsgInfo, 1);
 383         msginfo->flags = flags != 0 ? flags : MSG_NEW|MSG_UNREAD;
 384         msginfo->inreplyto = NULL;
 385
 386         while ((hnum = procheader_get_one_field(buf, sizeof(buf), fp, hentry))
 387                != -1) {
 388                 hp = buf + strlen(hentry[hnum].name);
 389                 while (*hp == ' ' || *hp == '\t') hp++;
 390
 391                 switch (hnum) {
 392                 case H_DATE:
 393                         if (msginfo->date) break;
 394                         msginfo->date_t =
 395                                 procheader_date_parse(NULL, hp, 0);
 396                         msginfo->date = g_strdup(hp);
 397                         break;
 398                 case H_FROM:
 399                         if (msginfo->from) break;
 400                         conv_unmime_header(tmp, sizeof(tmp), hp, NULL);
 401                         msginfo->from = g_strdup(tmp);
 402                         msginfo->fromname = procheader_get_fromname(tmp);
 403                         break;
 404                 case H_TO:
 405                         conv_unmime_header(tmp, sizeof(tmp), hp, NULL);
 406                         if (msginfo->to) {
 407                                 p = msginfo->to;
 408                                 msginfo->to =
 409                                         g_strconcat(p, ", ", tmp, NULL);
 410                                 g_free(p);
 411                         } else
 412                                 msginfo->to = g_strdup(tmp);
 413                         break;
 414                 case H_CC:
 415                         conv_unmime_header(tmp, sizeof(tmp), hp, NULL);
 416                         if (msginfo->cc) {
 417                                 p = msginfo->cc;
 418                                 msginfo->cc =
 419                                         g_strconcat(p, ", ", tmp, NULL);
 420                                 g_free(p);
 421                         } else
 422                                 msginfo->cc = g_strdup(tmp);
 423                         break;
 424                 case H_NEWSGROUPS:
 425                         if (msginfo->newsgroups) {
 426                                 p = msginfo->newsgroups;
 427                                 msginfo->newsgroups =
 428                                         g_strconcat(p, ",", hp, NULL);
 429                                 g_free(p);
 430                         } else
 431                                 msginfo->newsgroups = g_strdup(buf + 12);
 432                         break;
 433                 case H_SUBJECT:
 434                         if (msginfo->subject) break;
 435                         conv_unmime_header(tmp, sizeof(tmp), hp, NULL);
 436                         msginfo->subject = g_strdup(tmp);
 437                         break;
 438                 case H_MSG_ID:
 439                         if (msginfo->msgid) break;
 440
 441                         extract_parenthesis(hp, '<', '>');
 442                         remove_space(hp);
 443                         msginfo->msgid = g_strdup(hp);
 444                         break;
 445                 case H_REFERENCES:
 446                         if (!reference) {
 447                                 eliminate_parenthesis(hp, '(', ')');
 448                                 if ((p = strrchr(hp, '<')) != NULL &&
 449                                     strchr(p + 1, '>') != NULL) {
 450                                         extract_parenthesis(p, '<', '>');
 451                                         remove_space(p);
 452                                         if (*p != '\0')
 453                                                 reference = g_strdup(p);
 454                                 }
 455                         }
 456                         break;
 457                 case H_IN_REPLY_TO:
 458                         if (!reference) {
 459                                 eliminate_parenthesis(hp, '(', ')');
 460                                 extract_parenthesis(hp, '<', '>');
 461                                 remove_space(hp);
 462                                 if (*hp != '\0')
 463                                         reference = g_strdup(hp);
 464                         }
 465                         break;
 466                 case H_CONTENT_TYPE:
 467                         if (!strncasecmp(hp, "multipart", 9))
 468                                 msginfo->flags |= MSG_MIME;
 469                         break;
 470                 case H_SEEN:
 471                         /* mnews Seen header */
 472                         MSG_UNSET_FLAGS(msginfo->flags, MSG_NEW|MSG_UNREAD);
 473                         break;
 474                 case H_X_FACE:
 475                         if (msginfo->xface) break;
 476                         msginfo->xface = g_strdup(hp);
 477                         break;
 478                 case H_DISPOSITION_NOTIFICATION_TO:
 479                         if (msginfo->dispositionnotificationto) break;
 480                         msginfo->dispositionnotificationto = g_strdup(hp);
 481                         break;
 482                 default:
 483                 }
 484         }
 485         msginfo->inreplyto = reference;
 486
 487         fclose(fp);
 488
 489         return msginfo;
 490 }
 491
 492 gchar *procheader_get_fromname(const gchar *str)
 493 {
 494         gchar *tmp, *name;
 495
 496         Xalloca(tmp, strlen(str) + 1, return NULL);
 497         strcpy(tmp, str);
 498
 499         if (*tmp == '\"') {
 500                 extract_quote(tmp, '\"');
 501                 g_strstrip(tmp);
 502         } else if (strchr(tmp, '<')) {
 503                 eliminate_parenthesis(tmp, '<', '>');
 504                 g_strstrip(tmp);
 505                 if (*tmp == '\0') {
 506                         strcpy(tmp, str);
 507                         extract_parenthesis(tmp, '<', '>');
 508                         g_strstrip(tmp);
 509                 }
 510         } else if (strchr(tmp, '(')) {
 511                 extract_parenthesis(tmp, '(', ')');
 512                 g_strstrip(tmp);
 513         }
 514
 515         if (*tmp == '\0')
 516                 name = g_strdup(str);
 517         else
 518                 name = g_strdup(tmp);
 519
 520         return name;
 521 }
 522
 523 time_t procheader_date_parse(gchar *dest, const gchar *src, gint len)
 524 {
 525         static gchar monthstr[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
 526         gchar weekday[4];
 527         gint day;
 528         gchar month[4];
 529         gint year;
 530         gint hh, mm, ss;
 531         gchar zone[6];
 532         gint result;
 533         GDateMonth dmonth;
 534         struct tm t;
 535         gchar *p;
 536         time_t timer;
 537
 538         /* parsing date field... */
 539         result = sscanf(src, "%3s, %d %3s %d %2d:%2d:%2d %5s",
 540                         weekday, &day, month, &year, &hh, &mm, &ss, zone);
 541         if (result != 8) {
 542                 result = sscanf(src, "%d %3s %d %2d:%2d:%2d %5s",
 543                                 &day, month, &year, &hh, &mm, &ss, zone);
 544                 if (result != 7) {
 545                         ss = 0;
 546                         result = sscanf(src, "%3s, %d %3s %d %2d:%2d %5s",
 547                                         weekday, &day, month, &year, &hh, &mm, zone);
 548                         if (result != 7) {
 549                                 result = sscanf(src, "%d %3s %d %2d:%2d %5s",
 550                                                 &day, month, &year, &hh, &mm,
 551                                                 zone);
 552                                 if (result != 6) {
 553                                         g_warning("Invalid date: %s\n", src);
 554                                         if (dest && len > 0)
 555                                                 strncpy2(dest, src, len);
 556                                         return 0;
 557                                 }
 558                         }
 559                 }
 560         }
 561
 562         /* Y2K compliant :) */
 563         if (year < 100) {
 564                 if (year < 70)
 565                         year += 2000;
 566                 else
 567                         year += 1900;
 568         }
 569
 570         if ((p = strstr(monthstr, month)) != NULL)
 571                 dmonth = (gint)(p - monthstr) / 3 + 1;
 572         else {
 573                 g_warning("Invalid month: %s\n", month);
 574                 dmonth = G_DATE_BAD_MONTH;
 575         }
 576
 577         t.tm_sec = ss;
 578         t.tm_min = mm;
 579         t.tm_hour = hh;
 580         t.tm_mday = day;
 581         t.tm_mon = dmonth - 1;
 582         t.tm_year = year - 1900;
 583         t.tm_wday = 0;
 584         t.tm_yday = 0;
 585         t.tm_isdst = -1;
 586
 587         timer = mktime(&t);
 588         timer += tzoffset_sec(&timer) - remote_tzoffset_sec(zone);
 589
 590         if (dest)
 591                 procheader_date_get_localtime(dest, len, timer);
 592
 593         return timer;
 594 }
 595
 596 void procheader_date_get_localtime(gchar *dest, gint len, const time_t timer)
 597 {
 598         struct tm *lt;
 599         gchar *default_format = "%y/%m/%d(%a) %H:%M";
 600
 601         lt = localtime(&timer);
 602
 603         if (prefs_common.date_format)
 604                 strftime(dest, len, prefs_common.date_format, lt);
 605         else
 606                 strftime(dest, len, default_format, lt);
 607 }