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 static gchar *pop3_get_filename_for_partial_mail(Pop3Session *session,
 613                                                  gchar *muidl)
 614 {
 615         gchar *path;
 616         gchar *result = NULL;
 617         FILE *fp;
 618         gchar buf[POPBUFSIZE];
 619         gchar uidl[POPBUFSIZE];
 620         time_t recv_time;
 621         time_t now;
 622         gint partial_recv;
 623
 624         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 625                            "uidl", G_DIR_SEPARATOR_S,
 626                            session->ac_prefs->recv_server,
 627                            "-", session->ac_prefs->userid, NULL);
 628         if ((fp = fopen(path, "rb")) == NULL) {
 629                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 630                 g_free(path);
 631                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 632                                    "uidl-", session->ac_prefs->recv_server,
 633                                    "-", session->ac_prefs->userid, NULL);
 634                 if ((fp = fopen(path, "rb")) == NULL) {
 635                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 636                         g_free(path);
 637                         return result;
 638                 }
 639         }
 640         g_free(path);
 641
 642         now = time(NULL);
 643
 644         while (fgets(buf, sizeof(buf), fp) != NULL) {
 645                 gchar tmp[POPBUFSIZE];
 646                 strretchomp(buf);
 647                 recv_time = RECV_TIME_NONE;
 648                 partial_recv = 0;
 649
 650                 if (sscanf(buf, "%s\t%ld\t%s", uidl, &recv_time, &tmp) < 2) {
 651                         if (sscanf(buf, "%s", uidl) != 1)
 652                                 continue;
 653                         else {
 654                                 recv_time = now;
 655                         }
 656                 }
 657                 if (!strcmp(muidl, uidl)) {
 658                         result = strdup(tmp);
 659                         break;
 660                 }
 661         }
 662
 663         fclose(fp);
 664
 665         return result;
 666 }
 667
 668 int pop3_mark_for_download(const gchar *server, const gchar *login,
 669                            const gchar *muidl, const gchar *filename)
 670 {
 671         gchar *path;
 672         gchar *pathnew;
 673         FILE *fp;
 674         FILE *fpnew;
 675         gchar buf[POPBUFSIZE];
 676         gchar uidl[POPBUFSIZE];
 677         time_t recv_time;
 678         time_t now;
 679         int len;
 680         gchar partial_recv[POPBUFSIZE];
 681
 682
 683         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 684                            "uidl", G_DIR_SEPARATOR_S, server,
 685                            "-", login, NULL);
 686         if ((fp = fopen(path, "rb")) == NULL) {
 687                 perror("fopen1");
 688                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 689                 g_free(path);
 690                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 691                                    "uidl-", server,
 692                                    "-", login, NULL);
 693                 if ((fp = fopen(path, "rb")) == NULL) {
 694                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 695                         g_free(path);
 696                 }
 697                 return -1;
 698         }
 699
 700         pathnew = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 701                            "uidl", G_DIR_SEPARATOR_S, server,
 702                            "-", login, ".new", NULL);
 703         if ((fpnew = fopen(pathnew, "wb")) == NULL) {
 704                 perror("fopen2");
 705                 fclose(fp);
 706                 g_free(pathnew);
 707                 return -1;
 708         }
 709
 710         now = time(NULL);
 711
 712         while (fgets(buf, sizeof(buf), fp) != NULL) {
 713                 strretchomp(buf);
 714                 recv_time = RECV_TIME_NONE;
 715                 sprintf(partial_recv,"0");
 716
 717                 if (sscanf(buf, "%s\t%ld\t%s",
 718                            uidl, &recv_time, &partial_recv) < 2) {
 719                         if (sscanf(buf, "%s", uidl) != 1)
 720                                 continue;
 721                         else {
 722                                 recv_time = now;
 723                         }
 724                 }
 725                 if (strcmp(muidl, uidl)) {
 726                         fprintf(fpnew, "%s\t%ld\t%s\n",
 727                                 uidl, recv_time, partial_recv);
 728                 } else {
 729                         fprintf(fpnew, "%s\t%ld\t%s\n",
 730                                 uidl, recv_time, filename);
 731                 }
 732         }
 733         fclose(fpnew);
 734         fclose(fp);
 735
 736         move_file(pathnew, path, TRUE);
 737
 738         g_free(path);
 739         g_free(pathnew);
 740
 741         if ((fp = fopen(filename,"rb")) == NULL) {
 742                 perror("fopen3");
 743                 return -1;
 744         }
 745         pathnew = g_strdup_printf("%s.new", filename);
 746         if ((fpnew = fopen(pathnew, "wb")) == NULL) {
 747                 perror("fopen4");
 748                 fclose(fp);
 749                 g_free(pathnew);
 750                 return -1;
 751         }
 752
 753         fprintf(fpnew, "SC-Marked-For-Download: 1\n");
 754         while ((len = fread(buf, sizeof(gchar), sizeof(buf), fp)) > 0) {
 755                 fprintf(fpnew, "%s", buf);
 756         }
 757         fclose(fpnew);
 758         fclose(fp);
 759         unlink(filename);
 760         rename(pathnew, filename);
 761
 762         g_free(pathnew);
 763         return 0;
 764 }
 765
 766 gint pop3_write_uidl_list(Pop3Session *session)
 767 {
 768         gchar *path;
 769         FILE *fp;
 770         Pop3MsgInfo *msg;
 771         gint n;
 772
 773         if (!session->uidl_is_valid) return 0;
 774
 775         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 776                            "uidl", G_DIR_SEPARATOR_S,
 777                            session->ac_prefs->recv_server,
 778                            "-", session->ac_prefs->userid, NULL);
 779         if ((fp = fopen(path, "wb")) == NULL) {
 780                 FILE_OP_ERROR(path, "fopen");
 781                 g_free(path);
 782                 return -1;
 783         }
 784
 785         for (n = 1; n <= session->count; n++) {
 786                 msg = &session->msg[n];
 787                 if (msg->uidl && msg->received && !msg->deleted) {
 788                         fprintf(fp, "%s\t%ld\t%d\n",
 789                                 msg->uidl, msg->recv_time, msg->partial_recv);
 790                 }
 791         }
 792
 793         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 794         g_free(path);
 795
 796         return 0;
 797 }
 798
 799 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 800                                    guint len, const gchar *prefix)
 801 {
 802         FILE *fp;
 803         const gchar *prev, *cur;
 804
 805         g_return_val_if_fail(file != NULL, -1);
 806
 807         if ((fp = fopen(file, "wb")) == NULL) {
 808                 FILE_OP_ERROR(file, "fopen");
 809                 return -1;
 810         }
 811
 812         if (change_file_mode_rw(fp, file) < 0)
 813                 FILE_OP_ERROR(file, "chmod");
 814
 815         if (prefix != NULL) {
 816                 fprintf(fp, prefix);
 817                 fprintf(fp, "\n");
 818         }
 819
 820         /* +------------------+----------------+--------------------------+ *
 821          * ^data              ^prev            ^cur             data+len-1^ */
 822
 823         prev = data;
 824         while ((cur = memchr(prev, '\r', len - (prev - data))) != NULL) {
 825                 if ((cur > prev && fwrite(prev, cur - prev, 1, fp) < 1) ||
 826                     fputc('\n', fp) == EOF) {
 827                         FILE_OP_ERROR(file, "fwrite");
 828                         g_warning("can't write to file: %s\n", file);
 829                         fclose(fp);
 830                         unlink(file);
 831                         return -1;
 832                 }
 833
 834                 if (cur == data + len - 1) {
 835                         prev = cur + 1;
 836                         break;
 837                 }
 838
 839                 if (*(cur + 1) == '\n')
 840                         prev = cur + 2;
 841                 else
 842                         prev = cur + 1;
 843
 844                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 845                         prev++;
 846
 847                 if (prev - data >= len)
 848                         break;
 849         }
 850
 851         if (prev - data < len &&
 852             fwrite(prev, len - (prev - data), 1, fp) < 1) {
 853                 FILE_OP_ERROR(file, "fwrite");
 854                 g_warning("can't write to file: %s\n", file);
 855                 fclose(fp);
 856                 unlink(file);
 857                 return -1;
 858         }
 859         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 860                 if (fputc('\n', fp) == EOF) {
 861                         FILE_OP_ERROR(file, "fputc");
 862                         g_warning("can't write to file: %s\n", file);
 863                         fclose(fp);
 864                         unlink(file);
 865                         return -1;
 866                 }
 867         }
 868
 869         if (fclose(fp) == EOF) {
 870                 FILE_OP_ERROR(file, "fclose");
 871                 unlink(file);
 872                 return -1;
 873         }
 874
 875         return 0;
 876 }
 877
 878 static Pop3State pop3_lookup_next(Pop3Session *session)
 879 {
 880         Pop3MsgInfo *msg;
 881         PrefsAccount *ac = session->ac_prefs;
 882         gint size;
 883         gboolean size_limit_over;
 884
 885         for (;;) {
 886                 msg = &session->msg[session->cur_msg];
 887                 size = msg->size;
 888                 size_limit_over =
 889                     (ac->enable_size_limit &&
 890                      ac->size_limit > 0 &&
 891                      size > ac->size_limit * 1024);
 892
 893                 if (ac->rmmail &&
 894                     msg->recv_time != RECV_TIME_NONE &&
 895                     msg->recv_time != RECV_TIME_KEEP &&
 896                     session->current_time - msg->recv_time >=
 897                     ac->msg_leave_time * 24 * 60 * 60) {
 898                         if (msg->partial_recv == 0) {
 899                                 log_message
 900                                         (_("POP3: Deleting expired message "
 901                                            "%d\n"), session->cur_msg);
 902                                 pop3_delete_send(session);
 903                                 return POP3_DELETE;
 904                         } else if (session->current_time - msg->recv_time >=
 905                                    5 * 24 * 60 * 60) {
 906                                 log_message
 907                                         (_("POP3: Deleting too big expired "
 908                                            "message %d\n"), session->cur_msg);
 909                                 pop3_delete_send(session);
 910                                 return POP3_DELETE;
 911                         }
 912                 }
 913
 914                 if (size_limit_over) {
 915                         log_message
 916                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 917                                    session->cur_msg, size);
 918
 919                         if (!msg->received && msg->partial_recv != 2) {
 920                                 pop3_top_send(session, ac->size_limit);
 921                                 return POP3_TOP;
 922                         } else if (msg->partial_recv == 2) {
 923                                 break;
 924                         }
 925                 }
 926
 927                 if (size == 0 || msg->received || size_limit_over) {
 928                         session->cur_total_bytes += size;
 929                         if (session->cur_msg == session->count) {
 930                                 pop3_logout_send(session);
 931                                 return POP3_LOGOUT;
 932                         } else
 933                                 session->cur_msg++;
 934                 } else
 935                         break;
 936         }
 937
 938         pop3_retr_send(session);
 939         return POP3_RETR;
 940 }
 941
 942 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 943 {
 944         Pop3ErrorValue ok;
 945
 946         log_print("POP3< %s\n", msg);
 947
 948         if (!strncmp(msg, "+OK", 3))
 949                 ok = PS_SUCCESS;
 950         else if (!strncmp(msg, "-ERR", 4)) {
 951                 if (strstr(msg + 4, "lock") ||
 952                     strstr(msg + 4, "Lock") ||
 953                     strstr(msg + 4, "LOCK") ||
 954                     strstr(msg + 4, "wait")) {
 955                         log_warning(_("mailbox is locked\n"));
 956                         ok = PS_LOCKBUSY;
 957                 } else if (strcasestr(msg + 4, "timeout")) {
 958                         log_warning(_("session timeout\n"));
 959                         ok = PS_ERROR;
 960                 } else {
 961                         switch (session->state) {
 962 #if USE_OPENSSL
 963                         case POP3_STLS:
 964                                 log_warning(_("can't start TLS session\n"));
 965                                 ok = PS_ERROR;
 966                                 break;
 967 #endif
 968                         case POP3_GETAUTH_USER:
 969                         case POP3_GETAUTH_PASS:
 970                         case POP3_GETAUTH_APOP:
 971                                 log_warning(_("error occurred on authentication\n"));
 972                                 ok = PS_AUTHFAIL;
 973                                 break;
 974                         case POP3_GETRANGE_LAST:
 975                         case POP3_GETRANGE_UIDL:
 976                         case POP3_TOP:
 977                                 log_warning(_("command not supported\n"));
 978                                 ok = PS_NOTSUPPORTED;
 979                                 break;
 980
 981                         default:
 982                                 log_warning(_("error occurred on POP3 session\n"));
 983                                 ok = PS_ERROR;
 984                         }
 985                 }
 986
 987                 g_free(session->error_msg);
 988                 session->error_msg = g_strdup(msg);
 989                 fprintf(stderr, "POP3: %s\n", msg);
 990         } else
 991                 ok = PS_PROTOCOL;
 992
 993         session->error_val = ok;
 994         return ok;
 995 }
 996
 997 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 998 {
 999         Pop3Session *pop3_session = POP3_SESSION(session);
1000         Pop3ErrorValue val = PS_SUCCESS;
1001         const guchar *body;
1002
1003         body = msg;
1004         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
1005             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
1006                 val = pop3_ok(pop3_session, msg);
1007                 if (val != PS_SUCCESS) {
1008                         if (val != PS_NOTSUPPORTED) {
1009                                 pop3_session->state = POP3_ERROR;
1010                                 return -1;
1011                         }
1012                 }
1013
1014                 if (*body == '+' || *body == '-')
1015                         body++;
1016                 while (isalpha(*body))
1017                         body++;
1018                 while (isspace(*body))
1019                         body++;
1020         }
1021
1022         switch (pop3_session->state) {
1023         case POP3_READY:
1024         case POP3_GREETING:
1025                 pop3_greeting_recv(pop3_session, body);
1026 #if USE_OPENSSL
1027                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
1028                         pop3_stls_send(pop3_session);
1029                 else
1030 #endif
1031                 if (pop3_session->ac_prefs->protocol == A_APOP)
1032                         pop3_getauth_apop_send(pop3_session);
1033                 else
1034                         pop3_getauth_user_send(pop3_session);
1035                 break;
1036 #if USE_OPENSSL
1037         case POP3_STLS:
1038                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
1039                         return -1;
1040                 if (pop3_session->ac_prefs->protocol == A_APOP)
1041                         pop3_getauth_apop_send(pop3_session);
1042                 else
1043                         pop3_getauth_user_send(pop3_session);
1044                 break;
1045 #endif
1046         case POP3_GETAUTH_USER:
1047                 pop3_getauth_pass_send(pop3_session);
1048                 break;
1049         case POP3_GETAUTH_PASS:
1050         case POP3_GETAUTH_APOP:
1051                 if (!pop3_session->pop_before_smtp)
1052                         pop3_getrange_stat_send(pop3_session);
1053                 else
1054                         pop3_logout_send(pop3_session);
1055                 break;
1056         case POP3_GETRANGE_STAT:
1057                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
1058                         return -1;
1059                 if (pop3_session->count > 0)
1060                         pop3_getrange_uidl_send(pop3_session);
1061                 else
1062                         pop3_logout_send(pop3_session);
1063                 break;
1064         case POP3_GETRANGE_LAST:
1065                 if (val == PS_NOTSUPPORTED)
1066                         pop3_session->error_val = PS_SUCCESS;
1067                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
1068                         return -1;
1069                 if (pop3_session->cur_msg > 0)
1070                         pop3_getsize_list_send(pop3_session);
1071                 else
1072                         pop3_logout_send(pop3_session);
1073                 break;
1074         case POP3_GETRANGE_UIDL:
1075                 if (val == PS_NOTSUPPORTED) {
1076                         pop3_session->error_val = PS_SUCCESS;
1077                         pop3_getrange_last_send(pop3_session);
1078                 } else {
1079                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
1080                         session_recv_data(session, 0, ".\r\n");
1081                 }
1082                 break;
1083         case POP3_GETSIZE_LIST:
1084                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
1085                 session_recv_data(session, 0, ".\r\n");
1086                 break;
1087         case POP3_RETR:
1088                 pop3_session->state = POP3_RETR_RECV;
1089                 session_recv_data(session, 0, ".\r\n");
1090                 break;
1091         case POP3_TOP:
1092                 if (val == PS_NOTSUPPORTED) {
1093                         pop3_session->error_val = PS_SUCCESS;
1094                 } else {
1095                         pop3_session->state = POP3_TOP_RECV;
1096                         session_recv_data(session, 0, ".\r\n");
1097                 }
1098                 break;
1099         case POP3_DELETE:
1100                 pop3_delete_recv(pop3_session);
1101                 if (pop3_session->cur_msg == pop3_session->count)
1102                         pop3_logout_send(pop3_session);
1103                 else {
1104                         pop3_session->cur_msg++;
1105                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1106                                 return -1;
1107                 }
1108                 break;
1109         case POP3_LOGOUT:
1110                 session_disconnect(session);
1111                 break;
1112         case POP3_ERROR:
1113         default:
1114                 return -1;
1115         }
1116
1117         return 0;
1118 }
1119
1120 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
1121                                             guint len)
1122 {
1123         Pop3Session *pop3_session = POP3_SESSION(session);
1124         Pop3ErrorValue val = PS_SUCCESS;
1125
1126         switch (pop3_session->state) {
1127         case POP3_GETRANGE_UIDL_RECV:
1128                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
1129                 if (val == PS_SUCCESS) {
1130                         if (pop3_session->new_msg_exist)
1131                                 pop3_getsize_list_send(pop3_session);
1132                         else
1133                                 pop3_logout_send(pop3_session);
1134                 } else
1135                         return -1;
1136                 break;
1137         case POP3_GETSIZE_LIST_RECV:
1138                 val = pop3_getsize_list_recv(pop3_session, data, len);
1139                 if (val == PS_SUCCESS) {
1140                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1141                                 return -1;
1142                 } else
1143                         return -1;
1144                 break;
1145         case POP3_RETR_RECV:
1146                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1147                         return -1;
1148
1149                 if (pop3_session->ac_prefs->rmmail &&
1150                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1151                     pop3_session->msg[pop3_session->cur_msg].recv_time
1152                     != RECV_TIME_KEEP)
1153                         pop3_delete_send(pop3_session);
1154                 else if (pop3_session->cur_msg == pop3_session->count)
1155                         pop3_logout_send(pop3_session);
1156                 else {
1157                         pop3_session->cur_msg++;
1158                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1159                                 return -1;
1160                 }
1161                 break;
1162         case POP3_TOP_RECV:
1163                 if (pop3_top_recv(pop3_session, data, len) < 0)
1164                         return -1;
1165
1166                 if (pop3_session->cur_msg == pop3_session->count)
1167                         pop3_logout_send(pop3_session);
1168                 else {
1169                         pop3_session->cur_msg++;
1170                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1171                                 return -1;
1172                 }
1173                 break;
1174         case POP3_TOP:
1175                 log_warning(_("TOP command unsupported\n"));
1176                 if (pop3_session->cur_msg == pop3_session->count)
1177                         pop3_logout_send(pop3_session);
1178                 else {
1179                         pop3_session->cur_msg++;
1180                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1181                                 return -1;
1182                 }
1183                 break;
1184         case POP3_ERROR:
1185         default:
1186                 return -1;
1187         }
1188
1189         return 0;
1190 }