src/pop.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2004 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 <stdarg.h>
  28 #include <ctype.h>
  29 #include <unistd.h>
  30 #include <time.h>
  31 #include <errno.h>
  32
  33 #include "intl.h"
  34 #include "pop.h"
  35 #include "md5.h"
  36 #include "prefs_account.h"
  37 #include "utils.h"
  38 #include "recv.h"
  39
  40 #include "log.h"
  41 #include "hooks.h"
  42
  43 static gint pop3_greeting_recv          (Pop3Session *session,
  44                                          const gchar *msg);
  45 static gint pop3_getauth_user_send      (Pop3Session *session);
  46 static gint pop3_getauth_pass_send      (Pop3Session *session);
  47 static gint pop3_getauth_apop_send      (Pop3Session *session);
  48 #if USE_OPENSSL
  49 static gint pop3_stls_send              (Pop3Session *session);
  50 static gint pop3_stls_recv              (Pop3Session *session);
  51 #endif
  52 static gint pop3_getrange_stat_send     (Pop3Session *session);
  53 static gint pop3_getrange_stat_recv     (Pop3Session *session,
  54                                          const gchar *msg);
  55 static gint pop3_getrange_last_send     (Pop3Session *session);
  56 static gint pop3_getrange_last_recv     (Pop3Session *session,
  57                                          const gchar *msg);
  58 static gint pop3_getrange_uidl_send     (Pop3Session *session);
  59 static gint pop3_getrange_uidl_recv     (Pop3Session *session,
  60                                          const gchar *data,
  61                                          guint        len);
  62 static gint pop3_getsize_list_send      (Pop3Session *session);
  63 static gint pop3_getsize_list_recv      (Pop3Session *session,
  64                                          const gchar *data,
  65                                          guint        len);
  66 static gint pop3_retr_send              (Pop3Session *session);
  67 static gint pop3_retr_recv              (Pop3Session *session,
  68                                          const gchar *data,
  69                                          guint        len);
  70 static gint pop3_delete_send            (Pop3Session *session);
  71 static gint pop3_delete_recv            (Pop3Session *session);
  72 static gint pop3_logout_send            (Pop3Session *session);
  73
  74 static void pop3_gen_send               (Pop3Session    *session,
  75                                          const gchar    *format, ...);
  76
  77 static void pop3_session_destroy        (Session        *session);
  78
  79 static gint pop3_write_msg_to_file      (const gchar    *file,
  80                                          const gchar    *data,
  81                                          guint           len,
  82                                          const gchar    *prefix);
  83
  84 static Pop3State pop3_lookup_next       (Pop3Session    *session);
  85 static Pop3ErrorValue pop3_ok           (Pop3Session    *session,
  86                                          const gchar    *msg);
  87
  88 static gint pop3_session_recv_msg               (Session        *session,
  89                                                  const gchar    *msg);
  90 static gint pop3_session_recv_data_finished     (Session        *session,
  91                                                  guchar         *data,
  92                                                  guint           len);
  93
  94 static gchar *pop3_get_filename_for_partial_mail(Pop3Session    *session,
  95                                                  gchar          *muidl);
  96
  97 static gint pop3_greeting_recv(Pop3Session *session, const gchar *msg)
  98 {
  99         session->state = POP3_GREETING;
 100
 101         session->greeting = g_strdup(msg);
 102         return PS_SUCCESS;
 103 }
 104
 105 #if USE_OPENSSL
 106 static gint pop3_stls_send(Pop3Session *session)
 107 {
 108         session->state = POP3_STLS;
 109         pop3_gen_send(session, "STLS");
 110         return PS_SUCCESS;
 111 }
 112
 113 static gint pop3_stls_recv(Pop3Session *session)
 114 {
 115         if (session_start_tls(SESSION(session)) < 0) {
 116                 session->error_val = PS_SOCKET;
 117                 return -1;
 118         }
 119         return PS_SUCCESS;
 120 }
 121 #endif /* USE_OPENSSL */
 122
 123 static gint pop3_getauth_user_send(Pop3Session *session)
 124 {
 125         g_return_val_if_fail(session->user != NULL, -1);
 126
 127         session->state = POP3_GETAUTH_USER;
 128         pop3_gen_send(session, "USER %s", session->user);
 129         return PS_SUCCESS;
 130 }
 131
 132 static gint pop3_getauth_pass_send(Pop3Session *session)
 133 {
 134         g_return_val_if_fail(session->pass != NULL, -1);
 135
 136         session->state = POP3_GETAUTH_PASS;
 137         pop3_gen_send(session, "PASS %s", session->pass);
 138         return PS_SUCCESS;
 139 }
 140
 141 static gint pop3_getauth_apop_send(Pop3Session *session)
 142 {
 143         gchar *start, *end;
 144         gchar *apop_str;
 145         gchar md5sum[33];
 146
 147         g_return_val_if_fail(session->user != NULL, -1);
 148         g_return_val_if_fail(session->pass != NULL, -1);
 149
 150         session->state = POP3_GETAUTH_APOP;
 151
 152         if ((start = strchr(session->greeting, '<')) == NULL) {
 153                 log_warning(_("Required APOP timestamp not found "
 154                             "in greeting\n"));
 155                 session->error_val = PS_PROTOCOL;
 156                 return -1;
 157         }
 158
 159         if ((end = strchr(start, '>')) == NULL || end == start + 1) {
 160                 log_warning(_("Timestamp syntax error in greeting\n"));
 161                 session->error_val = PS_PROTOCOL;
 162                 return -1;
 163         }
 164
 165         *(end + 1) = '\0';
 166
 167         apop_str = g_strconcat(start, session->pass, NULL);
 168         md5_hex_digest(md5sum, apop_str);
 169         g_free(apop_str);
 170
 171         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 172
 173         return PS_SUCCESS;
 174 }
 175
 176 static gint pop3_getrange_stat_send(Pop3Session *session)
 177 {
 178         session->state = POP3_GETRANGE_STAT;
 179         pop3_gen_send(session, "STAT");
 180         return PS_SUCCESS;
 181 }
 182
 183 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 184 {
 185         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 186                 log_warning(_("POP3 protocol error\n"));
 187                 session->error_val = PS_PROTOCOL;
 188                 return -1;
 189         } else {
 190                 if (session->count == 0) {
 191                         session->uidl_is_valid = TRUE;
 192                 } else {
 193                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 194                         session->cur_msg = 1;
 195                 }
 196         }
 197
 198         return PS_SUCCESS;
 199 }
 200
 201 static gint pop3_getrange_last_send(Pop3Session *session)
 202 {
 203         session->state = POP3_GETRANGE_LAST;
 204         pop3_gen_send(session, "LAST");
 205         return PS_SUCCESS;
 206 }
 207
 208 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 209 {
 210         gint last;
 211
 212         if (sscanf(msg, "%d", &last) == 0) {
 213                 log_warning(_("POP3 protocol error\n"));
 214                 session->error_val = PS_PROTOCOL;
 215                 return -1;
 216         } else {
 217                 if (session->count > last) {
 218                         session->new_msg_exist = TRUE;
 219                         session->cur_msg = last + 1;
 220                 } else
 221                         session->cur_msg = 0;
 222         }
 223
 224         return PS_SUCCESS;
 225 }
 226
 227 static gint pop3_getrange_uidl_send(Pop3Session *session)
 228 {
 229         session->state = POP3_GETRANGE_UIDL;
 230         pop3_gen_send(session, "UIDL");
 231         return PS_SUCCESS;
 232 }
 233
 234 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *data,
 235                                     guint len)
 236 {
 237         gchar id[IDLEN + 1];
 238         gchar buf[POPBUFSIZE];
 239         gint buf_len;
 240         gint num;
 241         time_t recv_time;
 242         gint partial_recv;
 243         const gchar *p = data;
 244         const gchar *lastp = data + len;
 245         const gchar *newline;
 246
 247         while (p < lastp) {
 248                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 249                         return -1;
 250                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 251                 memcpy(buf, p, buf_len);
 252                 buf[buf_len] = '\0';
 253
 254                 p = newline + 1;
 255                 if (p < lastp && *p == '\n') p++;
 256
 257                 if (sscanf(buf, "%d %" Xstr(IDLEN) "s", &num, id) != 2)
 258                         return -1;
 259                 if (num <= 0 || num > session->count)
 260                         return -1;
 261
 262                 session->msg[num].uidl = g_strdup(id);
 263
 264                 recv_time = (time_t)g_hash_table_lookup(
 265                                         session->uidl_table, id);
 266                 session->msg[num].recv_time = recv_time;
 267
 268                 partial_recv = (gint)g_hash_table_lookup(
 269                                         session->partial_recv_table, id);
 270
 271                 if (!session->ac_prefs->getall && recv_time != RECV_TIME_NONE) {
 272                         session->msg[num].received = (partial_recv != 2);
 273                         session->msg[num].partial_recv = partial_recv;
 274
 275                 }
 276                 if (!session->new_msg_exist &&
 277                     (session->ac_prefs->getall || recv_time == RECV_TIME_NONE ||
 278                      session->ac_prefs->rmmail)) {
 279                         session->cur_msg = num;
 280                         session->new_msg_exist = TRUE;
 281                 }
 282         }
 283
 284         session->uidl_is_valid = TRUE;
 285         return PS_SUCCESS;
 286 }
 287
 288 static gint pop3_getsize_list_send(Pop3Session *session)
 289 {
 290         session->state = POP3_GETSIZE_LIST;
 291         pop3_gen_send(session, "LIST");
 292         return PS_SUCCESS;
 293 }
 294
 295 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 296                                    guint len)
 297 {
 298         gchar buf[POPBUFSIZE];
 299         gint buf_len;
 300         guint num, size;
 301         const gchar *p = data;
 302         const gchar *lastp = data + len;
 303         const gchar *newline;
 304
 305         while (p < lastp) {
 306                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 307                         return -1;
 308                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 309                 memcpy(buf, p, buf_len);
 310                 buf[buf_len] = '\0';
 311
 312                 p = newline + 1;
 313                 if (p < lastp && *p == '\n') p++;
 314
 315                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 316                         session->error_val = PS_PROTOCOL;
 317                         return -1;
 318                 }
 319
 320                 if (num > 0 && num <= session->count)
 321                         session->msg[num].size = size;
 322                 if (num > 0 && num < session->cur_msg)
 323                         session->cur_total_bytes += size;
 324         }
 325
 326         return PS_SUCCESS;
 327 }
 328
 329 static gint pop3_retr_send(Pop3Session *session)
 330 {
 331         session->state = POP3_RETR;
 332         pop3_gen_send(session, "RETR %d", session->cur_msg);
 333         return PS_SUCCESS;
 334 }
 335
 336 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 337 {
 338         gchar *file;
 339         gint drop_ok;
 340         MailReceiveData mail_receive_data;
 341
 342         mail_receive_data.session = session;
 343         mail_receive_data.data = g_strndup(data, len);
 344         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 345
 346         file = get_tmp_file();
 347         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 348                 strlen(mail_receive_data.data), NULL) < 0) {
 349                 g_free(file);
 350                 g_free(mail_receive_data.data);
 351                 session->error_val = PS_IOERR;
 352                 return -1;
 353         }
 354         g_free(mail_receive_data.data);
 355
 356         if (session->msg[session->cur_msg].partial_recv == 2) {
 357                 gchar *old_file = pop3_get_filename_for_partial_mail(
 358                                 session, session->msg[session->cur_msg].uidl);
 359                 if (old_file != NULL) {
 360                         move_file(file, old_file, TRUE);
 361                         g_free(file);
 362                         file = old_file;
 363                 }
 364                 /* drop_ok: 0: success 1: don't receive -1: error */
 365                 drop_ok = session->drop_message(
 366                                 session, file, old_file != NULL);
 367         } else {
 368                 /* drop_ok: 0: success 1: don't receive -1: error */
 369                 drop_ok = session->drop_message(
 370                                 session, file, FALSE);
 371         }
 372         g_free(file);
 373         if (drop_ok < 0) {
 374                 session->error_val = PS_IOERR;
 375                 return -1;
 376         }
 377
 378         session->cur_total_bytes += session->msg[session->cur_msg].size;
 379         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 380         session->cur_total_num++;
 381
 382         session->msg[session->cur_msg].received = TRUE;
 383         session->msg[session->cur_msg].partial_recv = FALSE;
 384
 385         session->msg[session->cur_msg].recv_time =
 386                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 387
 388         return PS_SUCCESS;
 389 }
 390
 391 static gint pop3_top_send(Pop3Session *session, gint max_size)
 392 {
 393         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 394         session->state = POP3_TOP;
 395         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 396         return PS_SUCCESS;
 397 }
 398
 399 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 400 {
 401         gchar *file;
 402         gint drop_ok;
 403         MailReceiveData mail_receive_data;
 404         gchar *partial_notice = NULL;
 405
 406         mail_receive_data.session = session;
 407         mail_receive_data.data = g_strndup(data, len);
 408         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 409
 410         partial_notice = g_strdup_printf("SC-Partially-Retrieved: %s\n"
 411                                          "SC-Account-Server: %s\n"
 412                                          "SC-Account-Login: %s\n"
 413                                          "SC-Message-Size: %d",
 414                                          session->msg[session->cur_msg].uidl,
 415                                          session->ac_prefs->recv_server,
 416                                          session->ac_prefs->userid,
 417                                          session->msg[session->cur_msg].size);
 418         file = get_tmp_file();
 419         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 420                 strlen(mail_receive_data.data), partial_notice) < 0) {
 421                 g_free(file);
 422                 g_free(mail_receive_data.data);
 423                 session->error_val = PS_IOERR;
 424                 g_free(partial_notice);
 425                 return -1;
 426         }
 427         g_free(mail_receive_data.data);
 428         g_free(partial_notice);
 429
 430         /* drop_ok: 0: success 1: don't receive -1: error */
 431         drop_ok = session->drop_message(session, file, FALSE);
 432         g_free(file);
 433         if (drop_ok < 0) {
 434                 session->error_val = PS_IOERR;
 435                 return -1;
 436         }
 437
 438         session->cur_total_bytes += session->msg[session->cur_msg].size;
 439         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 440         session->cur_total_num++;
 441
 442         session->msg[session->cur_msg].received = TRUE;
 443         session->msg[session->cur_msg].partial_recv = TRUE;
 444         session->msg[session->cur_msg].recv_time =
 445                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 446
 447         return PS_SUCCESS;
 448 }
 449
 450 static gint pop3_delete_send(Pop3Session *session)
 451 {
 452         session->state = POP3_DELETE;
 453         pop3_gen_send(session, "DELE %d", session->cur_msg);
 454         return PS_SUCCESS;
 455 }
 456
 457 static gint pop3_delete_recv(Pop3Session *session)
 458 {
 459         session->msg[session->cur_msg].deleted = TRUE;
 460         return PS_SUCCESS;
 461 }
 462
 463 static gint pop3_logout_send(Pop3Session *session)
 464 {
 465         session->state = POP3_LOGOUT;
 466         pop3_gen_send(session, "QUIT");
 467         return PS_SUCCESS;
 468 }
 469
 470 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 471 {
 472         gchar buf[POPBUFSIZE + 1];
 473         va_list args;
 474
 475         va_start(args, format);
 476         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 477         va_end(args);
 478
 479         if (!strncasecmp(buf, "PASS ", 5))
 480                 log_print("POP3> PASS ********\n");
 481         else
 482                 log_print("POP3> %s\n", buf);
 483
 484         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 485 }
 486
 487 Session *pop3_session_new(PrefsAccount *account)
 488 {
 489         Pop3Session *session;
 490
 491         g_return_val_if_fail(account != NULL, NULL);
 492
 493         session = g_new0(Pop3Session, 1);
 494
 495         session_init(SESSION(session));
 496
 497         SESSION(session)->type = SESSION_POP3;
 498
 499         SESSION(session)->recv_msg = pop3_session_recv_msg;
 500         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 501         SESSION(session)->send_data_finished = NULL;
 502
 503         SESSION(session)->destroy = pop3_session_destroy;
 504
 505         session->state = POP3_READY;
 506         session->ac_prefs = account;
 507         session->pop_before_smtp = FALSE;
 508         pop3_get_uidl_table(account, session);
 509         session->current_time = time(NULL);
 510         session->error_val = PS_SUCCESS;
 511         session->error_msg = NULL;
 512
 513         return SESSION(session);
 514 }
 515
 516 static void pop3_session_destroy(Session *session)
 517 {
 518         Pop3Session *pop3_session = POP3_SESSION(session);
 519         gint n;
 520
 521         g_return_if_fail(session != NULL);
 522
 523         for (n = 1; n <= pop3_session->count; n++)
 524                 g_free(pop3_session->msg[n].uidl);
 525         g_free(pop3_session->msg);
 526
 527         if (pop3_session->uidl_table) {
 528                 hash_free_strings(pop3_session->uidl_table);
 529                 g_hash_table_destroy(pop3_session->uidl_table);
 530         }
 531
 532         if (pop3_session->partial_recv_table) {
 533                 hash_free_strings(pop3_session->partial_recv_table);
 534                 g_hash_table_destroy(pop3_session->partial_recv_table);
 535         }
 536
 537         g_free(pop3_session->greeting);
 538         g_free(pop3_session->user);
 539         g_free(pop3_session->pass);
 540         g_free(pop3_session->error_msg);
 541 }
 542
 543 void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session)
 544 {
 545         GHashTable *table;
 546         GHashTable *partial_recv_table;
 547         gchar *path;
 548         FILE *fp;
 549         gchar buf[POPBUFSIZE];
 550         gchar uidl[POPBUFSIZE];
 551         time_t recv_time;
 552         time_t now;
 553         gint partial_recv;
 554
 555         table = g_hash_table_new(g_str_hash, g_str_equal);
 556         partial_recv_table = g_hash_table_new(g_str_hash, g_str_equal);
 557
 558         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 559                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 560                            "-", ac_prefs->userid, NULL);
 561         if ((fp = fopen(path, "rb")) == NULL) {
 562                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 563                 g_free(path);
 564                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 565                                    "uidl-", ac_prefs->recv_server,
 566                                    "-", ac_prefs->userid, NULL);
 567                 if ((fp = fopen(path, "rb")) == NULL) {
 568                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 569                         g_free(path);
 570                         session->uidl_table = table;
 571                         session->partial_recv_table = partial_recv_table;
 572                         return;
 573                 }
 574         }
 575         g_free(path);
 576
 577         now = time(NULL);
 578
 579         while (fgets(buf, sizeof(buf), fp) != NULL) {
 580                 gchar tmp[POPBUFSIZE];
 581                 strretchomp(buf);
 582                 recv_time = RECV_TIME_NONE;
 583                 partial_recv = 0;
 584
 585                 if (sscanf(buf, "%s\t%ld\t%s", uidl, &recv_time, &tmp) < 2) {
 586                         if (sscanf(buf, "%s", uidl) != 1)
 587                                 continue;
 588                         else {
 589                                 recv_time = now;
 590                         }
 591                 }
 592                 if (recv_time == RECV_TIME_NONE)
 593                         recv_time = RECV_TIME_RECEIVED;
 594                 g_hash_table_insert(table, g_strdup(uidl),
 595                                     GINT_TO_POINTER(recv_time));
 596                 if (strlen(tmp) == 1)
 597                         partial_recv = atoi(tmp);
 598                 else
 599                         partial_recv = 2;
 600
 601                 g_hash_table_insert(partial_recv_table, g_strdup(uidl),
 602                                     GINT_TO_POINTER(partial_recv));
 603         }
 604
 605         fclose(fp);
 606         session->uidl_table = table;
 607         session->partial_recv_table = partial_recv_table;
 608
 609         return;
 610 }
 611
 612 int pop3_msg_in_uidl_list(const gchar *server, const gchar *login,
 613                           const gchar *muidl)
 614 {
 615         gchar *path;
 616         FILE *fp;
 617         gchar buf[POPBUFSIZE];
 618         gchar uidl[POPBUFSIZE];
 619         time_t recv_time;
 620         time_t now;
 621         gint partial_recv;
 622
 623         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 624                            "uidl", G_DIR_SEPARATOR_S, server,
 625                            "-", login, NULL);
 626         if ((fp = fopen(path, "rb")) == NULL) {
 627                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 628                 g_free(path);
 629                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 630                                    "uidl-", server,
 631                                    "-", login, NULL);
 632                 if ((fp = fopen(path, "rb")) == NULL) {
 633                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 634                         g_free(path);
 635                         return FALSE;
 636                 }
 637         }
 638         g_free(path);
 639
 640         now = time(NULL);
 641
 642         while (fgets(buf, sizeof(buf), fp) != NULL) {
 643                 gchar tmp[POPBUFSIZE];
 644                 strretchomp(buf);
 645                 recv_time = RECV_TIME_NONE;
 646                 partial_recv = 0;
 647
 648                 if (sscanf(buf, "%s\t%ld\t%s", uidl, &recv_time, &tmp) < 2) {
 649                         if (sscanf(buf, "%s", uidl) != 1)
 650                                 continue;
 651                         else {
 652                                 recv_time = now;
 653                         }
 654                 }
 655                 if (!strcmp(uidl, muidl)) {
 656                         fclose(fp);
 657                         return TRUE;
 658                 }
 659         }
 660
 661         fclose(fp);
 662         return FALSE;
 663 }
 664
 665 static gchar *pop3_get_filename_for_partial_mail(Pop3Session *session,
 666                                                  gchar *muidl)
 667 {
 668         gchar *path;
 669         gchar *result = NULL;
 670         FILE *fp;
 671         gchar buf[POPBUFSIZE];
 672         gchar uidl[POPBUFSIZE];
 673         time_t recv_time;
 674         time_t now;
 675         gint partial_recv;
 676
 677         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 678                            "uidl", G_DIR_SEPARATOR_S,
 679                            session->ac_prefs->recv_server,
 680                            "-", session->ac_prefs->userid, NULL);
 681         if ((fp = fopen(path, "rb")) == NULL) {
 682                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 683                 g_free(path);
 684                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 685                                    "uidl-", session->ac_prefs->recv_server,
 686                                    "-", session->ac_prefs->userid, NULL);
 687                 if ((fp = fopen(path, "rb")) == NULL) {
 688                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 689                         g_free(path);
 690                         return result;
 691                 }
 692         }
 693         g_free(path);
 694
 695         now = time(NULL);
 696
 697         while (fgets(buf, sizeof(buf), fp) != NULL) {
 698                 gchar tmp[POPBUFSIZE];
 699                 strretchomp(buf);
 700                 recv_time = RECV_TIME_NONE;
 701                 partial_recv = 0;
 702
 703                 if (sscanf(buf, "%s\t%ld\t%s", uidl, &recv_time, &tmp) < 2) {
 704                         if (sscanf(buf, "%s", uidl) != 1)
 705                                 continue;
 706                         else {
 707                                 recv_time = now;
 708                         }
 709                 }
 710                 if (!strcmp(muidl, uidl)) {
 711                         result = strdup(tmp);
 712                         break;
 713                 }
 714         }
 715
 716         fclose(fp);
 717
 718         return result;
 719 }
 720
 721 #define DOWNLOAD_MAIL 1
 722 #define DELETE_MAIL 2
 723 static int pop3_mark_mail(const gchar *server, const gchar *login,
 724                           const gchar *muidl, const gchar *filename,
 725                           int download)
 726 {
 727         gchar *path;
 728         gchar *pathnew;
 729         FILE *fp;
 730         FILE *fpnew;
 731         gchar buf[POPBUFSIZE];
 732         gchar uidl[POPBUFSIZE];
 733         time_t recv_time;
 734         time_t now;
 735         int len;
 736         int start = TRUE;
 737         gchar partial_recv[POPBUFSIZE];
 738
 739         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 740                            "uidl", G_DIR_SEPARATOR_S, server,
 741                            "-", login, NULL);
 742         if ((fp = fopen(path, "rb")) == NULL) {
 743                 perror("fopen1");
 744                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 745                 g_free(path);
 746                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 747                                    "uidl-", server,
 748                                    "-", login, NULL);
 749                 if ((fp = fopen(path, "rb")) == NULL) {
 750                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 751                         g_free(path);
 752                 }
 753                 return -1;
 754         }
 755
 756         pathnew = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 757                            "uidl", G_DIR_SEPARATOR_S, server,
 758                            "-", login, ".new", NULL);
 759         if ((fpnew = fopen(pathnew, "wb")) == NULL) {
 760                 perror("fopen2");
 761                 fclose(fp);
 762                 g_free(pathnew);
 763                 return -1;
 764         }
 765
 766         now = time(NULL);
 767
 768         while (fgets(buf, sizeof(buf), fp) != NULL) {
 769                 strretchomp(buf);
 770                 recv_time = RECV_TIME_NONE;
 771                 sprintf(partial_recv,"0");
 772
 773                 if (sscanf(buf, "%s\t%ld\t%s",
 774                            uidl, &recv_time, &partial_recv) < 2) {
 775                         if (sscanf(buf, "%s", uidl) != 1)
 776                                 continue;
 777                         else {
 778                                 recv_time = now;
 779                         }
 780                 }
 781                 if (strcmp(muidl, uidl)) {
 782                         fprintf(fpnew, "%s\t%ld\t%s\n",
 783                                 uidl, recv_time, partial_recv);
 784                 } else {
 785                         fprintf(fpnew, "%s\t%ld\t%s\n",
 786                                 uidl, recv_time,
 787                                 download==DOWNLOAD_MAIL?filename:"0");
 788                 }
 789         }
 790         fclose(fpnew);
 791         fclose(fp);
 792
 793         move_file(pathnew, path, TRUE);
 794
 795         g_free(path);
 796         g_free(pathnew);
 797
 798         if ((fp = fopen(filename,"rb")) == NULL) {
 799                 perror("fopen3");
 800                 return -1;
 801         }
 802         pathnew = g_strdup_printf("%s.new", filename);
 803         if ((fpnew = fopen(pathnew, "wb")) == NULL) {
 804                 perror("fopen4");
 805                 fclose(fp);
 806                 g_free(pathnew);
 807                 return -1;
 808         }
 809
 810         while ((len = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 811                 if (start) {
 812                         start = FALSE;
 813                         fprintf(fpnew, "SC-Marked-For-Download: %d\n", download);
 814                         printf("buf '%s'\n", buf);
 815                         if(!strncmp(buf, "SC-Marked-For-Download:",
 816                                     strlen("SC-Marked-For-Download:"))) {
 817                                 fprintf(fpnew, "%s", buf+strlen("SC-Marked-For-Download: x\n"));
 818                                 continue;
 819                         }
 820                 }
 821                 fprintf(fpnew, "%s", buf);
 822         }
 823         fclose(fpnew);
 824         fclose(fp);
 825         unlink(filename);
 826         rename(pathnew, filename);
 827
 828         g_free(pathnew);
 829         return 0;
 830 }
 831
 832 int pop3_mark_for_delete(const gchar *server, const gchar *login,
 833                          const gchar *muidl, const gchar *filename)
 834 {
 835         return pop3_mark_mail(server, login, muidl, filename, DELETE_MAIL);
 836 }
 837
 838 int pop3_mark_for_download(const gchar *server, const gchar *login,
 839                          const gchar *muidl, const gchar *filename)
 840 {
 841         return pop3_mark_mail(server, login, muidl, filename, DOWNLOAD_MAIL);
 842 }
 843
 844 gint pop3_write_uidl_list(Pop3Session *session)
 845 {
 846         gchar *path;
 847         FILE *fp;
 848         Pop3MsgInfo *msg;
 849         gint n;
 850
 851         if (!session->uidl_is_valid) return 0;
 852
 853         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 854                            "uidl", G_DIR_SEPARATOR_S,
 855                            session->ac_prefs->recv_server,
 856                            "-", session->ac_prefs->userid, NULL);
 857         if ((fp = fopen(path, "wb")) == NULL) {
 858                 FILE_OP_ERROR(path, "fopen");
 859                 g_free(path);
 860                 return -1;
 861         }
 862
 863         for (n = 1; n <= session->count; n++) {
 864                 msg = &session->msg[n];
 865                 if (msg->uidl && msg->received && !msg->deleted) {
 866                         fprintf(fp, "%s\t%ld\t%d\n",
 867                                 msg->uidl, msg->recv_time, msg->partial_recv);
 868                 }
 869         }
 870
 871         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 872         g_free(path);
 873
 874         return 0;
 875 }
 876
 877 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 878                                    guint len, const gchar *prefix)
 879 {
 880         FILE *fp;
 881         const gchar *prev, *cur;
 882
 883         g_return_val_if_fail(file != NULL, -1);
 884
 885         if ((fp = fopen(file, "wb")) == NULL) {
 886                 FILE_OP_ERROR(file, "fopen");
 887                 return -1;
 888         }
 889
 890         if (change_file_mode_rw(fp, file) < 0)
 891                 FILE_OP_ERROR(file, "chmod");
 892
 893         if (prefix != NULL) {
 894                 fprintf(fp, prefix);
 895                 fprintf(fp, "\n");
 896         }
 897
 898         /* +------------------+----------------+--------------------------+ *
 899          * ^data              ^prev            ^cur             data+len-1^ */
 900
 901         prev = data;
 902         while ((cur = memchr(prev, '\r', len - (prev - data))) != NULL) {
 903                 if ((cur > prev && fwrite(prev, cur - prev, 1, fp) < 1) ||
 904                     fputc('\n', fp) == EOF) {
 905                         FILE_OP_ERROR(file, "fwrite");
 906                         g_warning("can't write to file: %s\n", file);
 907                         fclose(fp);
 908                         unlink(file);
 909                         return -1;
 910                 }
 911
 912                 if (cur == data + len - 1) {
 913                         prev = cur + 1;
 914                         break;
 915                 }
 916
 917                 if (*(cur + 1) == '\n')
 918                         prev = cur + 2;
 919                 else
 920                         prev = cur + 1;
 921
 922                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 923                         prev++;
 924
 925                 if (prev - data >= len)
 926                         break;
 927         }
 928
 929         if (prev - data < len &&
 930             fwrite(prev, len - (prev - data), 1, fp) < 1) {
 931                 FILE_OP_ERROR(file, "fwrite");
 932                 g_warning("can't write to file: %s\n", file);
 933                 fclose(fp);
 934                 unlink(file);
 935                 return -1;
 936         }
 937         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 938                 if (fputc('\n', fp) == EOF) {
 939                         FILE_OP_ERROR(file, "fputc");
 940                         g_warning("can't write to file: %s\n", file);
 941                         fclose(fp);
 942                         unlink(file);
 943                         return -1;
 944                 }
 945         }
 946
 947         if (fclose(fp) == EOF) {
 948                 FILE_OP_ERROR(file, "fclose");
 949                 unlink(file);
 950                 return -1;
 951         }
 952
 953         return 0;
 954 }
 955
 956 static Pop3State pop3_lookup_next(Pop3Session *session)
 957 {
 958         Pop3MsgInfo *msg;
 959         PrefsAccount *ac = session->ac_prefs;
 960         gint size;
 961         gboolean size_limit_over;
 962
 963         for (;;) {
 964                 msg = &session->msg[session->cur_msg];
 965                 size = msg->size;
 966                 size_limit_over =
 967                     (ac->enable_size_limit &&
 968                      ac->size_limit > 0 &&
 969                      size > ac->size_limit * 1024);
 970
 971                 if (ac->rmmail &&
 972                     msg->recv_time != RECV_TIME_NONE &&
 973                     msg->recv_time != RECV_TIME_KEEP &&
 974                     msg->partial_recv == 0 &&
 975                     session->current_time - msg->recv_time >=
 976                     ac->msg_leave_time * 24 * 60 * 60) {
 977                         log_message
 978                                 (_("POP3: Deleting expired message "
 979                                    "%d\n"), session->cur_msg);
 980                         pop3_delete_send(session);
 981                         return POP3_DELETE;
 982                 }
 983
 984                 if (size_limit_over) {
 985                         log_message
 986                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 987                                    session->cur_msg, size);
 988
 989                         if (!msg->received && msg->partial_recv != 2) {
 990                                 pop3_top_send(session, ac->size_limit);
 991                                 return POP3_TOP;
 992                         } else if (msg->partial_recv == 2) {
 993                                 break;
 994                         }
 995                 }
 996
 997                 if (size == 0 || msg->received || size_limit_over) {
 998                         session->cur_total_bytes += size;
 999                         if (session->cur_msg == session->count) {
1000                                 pop3_logout_send(session);
1001                                 return POP3_LOGOUT;
1002                         } else
1003                                 session->cur_msg++;
1004                 } else
1005                         break;
1006         }
1007
1008         pop3_retr_send(session);
1009         return POP3_RETR;
1010 }
1011
1012 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
1013 {
1014         Pop3ErrorValue ok;
1015
1016         log_print("POP3< %s\n", msg);
1017
1018         if (!strncmp(msg, "+OK", 3))
1019                 ok = PS_SUCCESS;
1020         else if (!strncmp(msg, "-ERR", 4)) {
1021                 if (strstr(msg + 4, "lock") ||
1022                     strstr(msg + 4, "Lock") ||
1023                     strstr(msg + 4, "LOCK") ||
1024                     strstr(msg + 4, "wait")) {
1025                         log_warning(_("mailbox is locked\n"));
1026                         ok = PS_LOCKBUSY;
1027                 } else if (strcasestr(msg + 4, "timeout")) {
1028                         log_warning(_("session timeout\n"));
1029                         ok = PS_ERROR;
1030                 } else {
1031                         switch (session->state) {
1032 #if USE_OPENSSL
1033                         case POP3_STLS:
1034                                 log_warning(_("can't start TLS session\n"));
1035                                 ok = PS_ERROR;
1036                                 break;
1037 #endif
1038                         case POP3_GETAUTH_USER:
1039                         case POP3_GETAUTH_PASS:
1040                         case POP3_GETAUTH_APOP:
1041                                 log_warning(_("error occurred on authentication\n"));
1042                                 ok = PS_AUTHFAIL;
1043                                 break;
1044                         case POP3_GETRANGE_LAST:
1045                         case POP3_GETRANGE_UIDL:
1046                         case POP3_TOP:
1047                                 log_warning(_("command not supported\n"));
1048                                 ok = PS_NOTSUPPORTED;
1049                                 break;
1050
1051                         default:
1052                                 log_warning(_("error occurred on POP3 session\n"));
1053                                 ok = PS_ERROR;
1054                         }
1055                 }
1056
1057                 g_free(session->error_msg);
1058                 session->error_msg = g_strdup(msg);
1059                 fprintf(stderr, "POP3: %s\n", msg);
1060         } else
1061                 ok = PS_PROTOCOL;
1062
1063         session->error_val = ok;
1064         return ok;
1065 }
1066
1067 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
1068 {
1069         Pop3Session *pop3_session = POP3_SESSION(session);
1070         Pop3ErrorValue val = PS_SUCCESS;
1071         const guchar *body;
1072
1073         body = msg;
1074         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
1075             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
1076                 val = pop3_ok(pop3_session, msg);
1077                 if (val != PS_SUCCESS) {
1078                         if (val != PS_NOTSUPPORTED) {
1079                                 pop3_session->state = POP3_ERROR;
1080                                 return -1;
1081                         }
1082                 }
1083
1084                 if (*body == '+' || *body == '-')
1085                         body++;
1086                 while (isalpha(*body))
1087                         body++;
1088                 while (isspace(*body))
1089                         body++;
1090         }
1091
1092         switch (pop3_session->state) {
1093         case POP3_READY:
1094         case POP3_GREETING:
1095                 pop3_greeting_recv(pop3_session, body);
1096 #if USE_OPENSSL
1097                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
1098                         pop3_stls_send(pop3_session);
1099                 else
1100 #endif
1101                 if (pop3_session->ac_prefs->protocol == A_APOP)
1102                         pop3_getauth_apop_send(pop3_session);
1103                 else
1104                         pop3_getauth_user_send(pop3_session);
1105                 break;
1106 #if USE_OPENSSL
1107         case POP3_STLS:
1108                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
1109                         return -1;
1110                 if (pop3_session->ac_prefs->protocol == A_APOP)
1111                         pop3_getauth_apop_send(pop3_session);
1112                 else
1113                         pop3_getauth_user_send(pop3_session);
1114                 break;
1115 #endif
1116         case POP3_GETAUTH_USER:
1117                 pop3_getauth_pass_send(pop3_session);
1118                 break;
1119         case POP3_GETAUTH_PASS:
1120         case POP3_GETAUTH_APOP:
1121                 if (!pop3_session->pop_before_smtp)
1122                         pop3_getrange_stat_send(pop3_session);
1123                 else
1124                         pop3_logout_send(pop3_session);
1125                 break;
1126         case POP3_GETRANGE_STAT:
1127                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
1128                         return -1;
1129                 if (pop3_session->count > 0)
1130                         pop3_getrange_uidl_send(pop3_session);
1131                 else
1132                         pop3_logout_send(pop3_session);
1133                 break;
1134         case POP3_GETRANGE_LAST:
1135                 if (val == PS_NOTSUPPORTED)
1136                         pop3_session->error_val = PS_SUCCESS;
1137                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
1138                         return -1;
1139                 if (pop3_session->cur_msg > 0)
1140                         pop3_getsize_list_send(pop3_session);
1141                 else
1142                         pop3_logout_send(pop3_session);
1143                 break;
1144         case POP3_GETRANGE_UIDL:
1145                 if (val == PS_NOTSUPPORTED) {
1146                         pop3_session->error_val = PS_SUCCESS;
1147                         pop3_getrange_last_send(pop3_session);
1148                 } else {
1149                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
1150                         session_recv_data(session, 0, ".\r\n");
1151                 }
1152                 break;
1153         case POP3_GETSIZE_LIST:
1154                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
1155                 session_recv_data(session, 0, ".\r\n");
1156                 break;
1157         case POP3_RETR:
1158                 pop3_session->state = POP3_RETR_RECV;
1159                 session_recv_data(session, 0, ".\r\n");
1160                 break;
1161         case POP3_TOP:
1162                 if (val == PS_NOTSUPPORTED) {
1163                         pop3_session->error_val = PS_SUCCESS;
1164                 } else {
1165                         pop3_session->state = POP3_TOP_RECV;
1166                         session_recv_data(session, 0, ".\r\n");
1167                 }
1168                 break;
1169         case POP3_DELETE:
1170                 pop3_delete_recv(pop3_session);
1171                 if (pop3_session->cur_msg == pop3_session->count)
1172                         pop3_logout_send(pop3_session);
1173                 else {
1174                         pop3_session->cur_msg++;
1175                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1176                                 return -1;
1177                 }
1178                 break;
1179         case POP3_LOGOUT:
1180                 session_disconnect(session);
1181                 break;
1182         case POP3_ERROR:
1183         default:
1184                 return -1;
1185         }
1186
1187         return 0;
1188 }
1189
1190 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
1191                                             guint len)
1192 {
1193         Pop3Session *pop3_session = POP3_SESSION(session);
1194         Pop3ErrorValue val = PS_SUCCESS;
1195
1196         switch (pop3_session->state) {
1197         case POP3_GETRANGE_UIDL_RECV:
1198                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
1199                 if (val == PS_SUCCESS) {
1200                         if (pop3_session->new_msg_exist)
1201                                 pop3_getsize_list_send(pop3_session);
1202                         else
1203                                 pop3_logout_send(pop3_session);
1204                 } else
1205                         return -1;
1206                 break;
1207         case POP3_GETSIZE_LIST_RECV:
1208                 val = pop3_getsize_list_recv(pop3_session, data, len);
1209                 if (val == PS_SUCCESS) {
1210                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1211                                 return -1;
1212                 } else
1213                         return -1;
1214                 break;
1215         case POP3_RETR_RECV:
1216                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1217                         return -1;
1218
1219                 if (pop3_session->ac_prefs->rmmail &&
1220                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1221                     pop3_session->msg[pop3_session->cur_msg].recv_time
1222                     != RECV_TIME_KEEP)
1223                         pop3_delete_send(pop3_session);
1224                 else if (pop3_session->cur_msg == pop3_session->count)
1225                         pop3_logout_send(pop3_session);
1226                 else {
1227                         pop3_session->cur_msg++;
1228                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1229                                 return -1;
1230                 }
1231                 break;
1232         case POP3_TOP_RECV:
1233                 if (pop3_top_recv(pop3_session, data, len) < 0)
1234                         return -1;
1235
1236                 if (pop3_session->cur_msg == pop3_session->count)
1237                         pop3_logout_send(pop3_session);
1238                 else {
1239                         pop3_session->cur_msg++;
1240                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1241                                 return -1;
1242                 }
1243                 break;
1244         case POP3_TOP:
1245                 log_warning(_("TOP command unsupported\n"));
1246                 if (pop3_session->cur_msg == pop3_session->count)
1247                         pop3_logout_send(pop3_session);
1248                 else {
1249                         pop3_session->cur_msg++;
1250                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1251                                 return -1;
1252                 }
1253                 break;
1254         case POP3_ERROR:
1255         default:
1256                 return -1;
1257         }
1258
1259         return 0;
1260 }