src/pop.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2012 Hiroyuki Yamamoto and the Claws Mail team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  17  *
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #include "claws-features.h"
  23 #endif
  24
  25 #include <glib.h>
  26 #include <glib/gi18n.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdarg.h>
  30 #include <ctype.h>
  31 #include <unistd.h>
  32 #include <time.h>
  33 #include <errno.h>
  34
  35 #include "pop.h"
  36 #include "md5.h"
  37 #include "prefs_account.h"
  38 #include "utils.h"
  39 #include "recv.h"
  40 #include "partial_download.h"
  41 #include "log.h"
  42 #include "hooks.h"
  43 #include "file-utils.h"
  44
  45 static gint pop3_greeting_recv          (Pop3Session *session,
  46                                          const gchar *msg);
  47 static gint pop3_getauth_user_send      (Pop3Session *session);
  48 static gint pop3_getauth_pass_send      (Pop3Session *session);
  49 static gint pop3_getauth_apop_send      (Pop3Session *session);
  50 #ifdef USE_GNUTLS
  51 static gint pop3_stls_send              (Pop3Session *session);
  52 static gint pop3_stls_recv              (Pop3Session *session);
  53 #endif
  54 static gint pop3_getrange_stat_send     (Pop3Session *session);
  55 static gint pop3_getrange_stat_recv     (Pop3Session *session,
  56                                          const gchar *msg);
  57 static gint pop3_getrange_last_send     (Pop3Session *session);
  58 static gint pop3_getrange_last_recv     (Pop3Session *session,
  59                                          const gchar *msg);
  60 static gint pop3_getrange_uidl_send     (Pop3Session *session);
  61 static gint pop3_getrange_uidl_recv     (Pop3Session *session,
  62                                          const gchar *data,
  63                                          guint        len);
  64 static gint pop3_getsize_list_send      (Pop3Session *session);
  65 static gint pop3_getsize_list_recv      (Pop3Session *session,
  66                                          const gchar *data,
  67                                          guint        len);
  68 static gint pop3_retr_send              (Pop3Session *session);
  69 static gint pop3_retr_recv              (Pop3Session *session,
  70                                          const gchar *data,
  71                                          guint        len);
  72 static gint pop3_delete_send            (Pop3Session *session);
  73 static gint pop3_delete_recv            (Pop3Session *session);
  74 static gint pop3_logout_send            (Pop3Session *session);
  75
  76 static void pop3_gen_send               (Pop3Session    *session,
  77                                          const gchar    *format, ...);
  78
  79 static void pop3_session_destroy        (Session        *session);
  80
  81 static gint pop3_write_msg_to_file      (const gchar    *file,
  82                                          const gchar    *data,
  83                                          guint           len,
  84                                          const gchar    *prefix);
  85
  86 static Pop3State pop3_lookup_next       (Pop3Session    *session);
  87 static Pop3ErrorValue pop3_ok           (Pop3Session    *session,
  88                                          const gchar    *msg);
  89
  90 static gint pop3_session_recv_msg               (Session        *session,
  91                                                  const gchar    *msg);
  92 static gint pop3_session_recv_data_finished     (Session        *session,
  93                                                  guchar         *data,
  94                                                  guint           len);
  95 static void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session);
  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 #ifdef USE_GNUTLS
 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_GNUTLS */
 122
 123 static gint pop3_getauth_user_send(Pop3Session *session)
 124 {
 125         cm_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         cm_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         cm_return_val_if_fail(session->user != NULL, -1);
 148         cm_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_error(LOG_PROTOCOL, _("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_error(LOG_PROTOCOL, _("Timestamp syntax error in greeting\n"));
 161                 session->error_val = PS_PROTOCOL;
 162                 return -1;
 163         }
 164         *(end + 1) = '\0';
 165
 166         if (!is_ascii_str(start)) {
 167                 log_error(LOG_PROTOCOL, _("Timestamp syntax error in greeting (not ASCII)\n"));
 168                 session->error_val = PS_PROTOCOL;
 169                 return -1;
 170         }
 171
 172         apop_str = g_strconcat(start, session->pass, NULL);
 173         md5_hex_digest(md5sum, apop_str);
 174         g_free(apop_str);
 175
 176         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 177
 178         return PS_SUCCESS;
 179 }
 180
 181 static gint pop3_getrange_stat_send(Pop3Session *session)
 182 {
 183         session->state = POP3_GETRANGE_STAT;
 184         pop3_gen_send(session, "STAT");
 185         return PS_SUCCESS;
 186 }
 187
 188 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 189 {
 190         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 191                 log_error(LOG_PROTOCOL, _("POP protocol error\n"));
 192                 session->error_val = PS_PROTOCOL;
 193                 return -1;
 194         } else {
 195                 if (session->count == 0) {
 196                         session->uidl_is_valid = TRUE;
 197                 } else {
 198                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 199                         session->cur_msg = 1;
 200                 }
 201         }
 202
 203         return PS_SUCCESS;
 204 }
 205
 206 static gint pop3_getrange_last_send(Pop3Session *session)
 207 {
 208         session->state = POP3_GETRANGE_LAST;
 209         pop3_gen_send(session, "LAST");
 210         return PS_SUCCESS;
 211 }
 212
 213 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 214 {
 215         gint last;
 216
 217         if (sscanf(msg, "%d", &last) == 0) {
 218                 log_warning(LOG_PROTOCOL, _("POP protocol error\n"));
 219                 session->error_val = PS_PROTOCOL;
 220                 return -1;
 221         } else {
 222                 if (session->count > last) {
 223                         session->new_msg_exist = TRUE;
 224                         session->cur_msg = last + 1;
 225                 } else
 226                         session->cur_msg = 0;
 227         }
 228
 229         return PS_SUCCESS;
 230 }
 231
 232 static gint pop3_getrange_uidl_send(Pop3Session *session)
 233 {
 234         session->state = POP3_GETRANGE_UIDL;
 235         pop3_gen_send(session, "UIDL");
 236         return PS_SUCCESS;
 237 }
 238
 239 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *data,
 240                                     guint len)
 241 {
 242         gchar id[IDLEN + 1];
 243         gchar buf[POPBUFSIZE];
 244         gint buf_len;
 245         guint32 num;
 246         time_t recv_time;
 247         gint partial_recv;
 248         const gchar *p = data;
 249         const gchar *lastp = data + len;
 250         const gchar *newline;
 251
 252         while (p < lastp) {
 253                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 254                         return -1;
 255                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 256                 memcpy(buf, p, buf_len);
 257                 buf[buf_len] = '\0';
 258
 259                 p = newline + 1;
 260                 if (p < lastp && *p == '\n') p++;
 261
 262                 if (sscanf(buf, "%d %" Xstr(IDLEN) "s", &num, id) != 2 ||
 263                     num <= 0 || num > session->count) {
 264                         log_warning(LOG_PROTOCOL, _("invalid UIDL response: %s\n"), buf);
 265                         continue;
 266                 }
 267
 268                 session->msg[num].uidl = g_strdup(id);
 269
 270                 recv_time = (time_t)(GPOINTER_TO_INT(g_hash_table_lookup(
 271                                         session->uidl_table, id)));
 272                 session->msg[num].recv_time = recv_time;
 273
 274                 if (recv_time != RECV_TIME_NONE) {
 275                         debug_print("num %d uidl %s: already got it\n", num, id);
 276                 } else {
 277                         debug_print("num %d uidl %s: unknown\n", num, id);
 278                 }
 279
 280                 partial_recv = (gint)(GPOINTER_TO_INT(g_hash_table_lookup(
 281                                         session->partial_recv_table, id)));
 282
 283                 if (recv_time != RECV_TIME_NONE
 284                 || partial_recv != POP3_TOTALLY_RECEIVED) {
 285                         session->msg[num].received =
 286                                 (partial_recv != POP3_MUST_COMPLETE_RECV);
 287                         session->msg[num].partial_recv = partial_recv;
 288                         if (partial_recv == POP3_MUST_COMPLETE_RECV)
 289                                 session->new_msg_exist = TRUE;
 290                 }
 291                 if (!session->new_msg_exist &&
 292                     (recv_time == RECV_TIME_NONE ||
 293                      session->ac_prefs->rmmail)) {
 294                         session->cur_msg = num;
 295                         session->new_msg_exist = TRUE;
 296                 }
 297         }
 298
 299         session->uidl_is_valid = TRUE;
 300         return PS_SUCCESS;
 301 }
 302
 303 static gint pop3_getsize_list_send(Pop3Session *session)
 304 {
 305         session->state = POP3_GETSIZE_LIST;
 306         pop3_gen_send(session, "LIST");
 307         return PS_SUCCESS;
 308 }
 309
 310 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 311                                    guint len)
 312 {
 313         gchar buf[POPBUFSIZE];
 314         gint buf_len;
 315         guint num, size;
 316         const gchar *p = data;
 317         const gchar *lastp = data + len;
 318         const gchar *newline;
 319
 320         while (p < lastp) {
 321                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 322                         return -1;
 323                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 324                 memcpy(buf, p, buf_len);
 325                 buf[buf_len] = '\0';
 326
 327                 p = newline + 1;
 328                 if (p < lastp && *p == '\n') p++;
 329
 330                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 331                         session->error_val = PS_PROTOCOL;
 332                         return -1;
 333                 }
 334
 335                 if (num > 0 && num <= session->count)
 336                         session->msg[num].size = size;
 337                 if (num > 0 && num < session->cur_msg)
 338                         session->cur_total_bytes += size;
 339         }
 340
 341         return PS_SUCCESS;
 342 }
 343
 344 static gint pop3_retr_send(Pop3Session *session)
 345 {
 346         session->state = POP3_RETR;
 347         debug_print("retrieving %d [%s]\n", session->cur_msg,
 348                 session->msg[session->cur_msg].uidl ?
 349                  session->msg[session->cur_msg].uidl:" ");
 350         pop3_gen_send(session, "RETR %d", session->cur_msg);
 351         return PS_SUCCESS;
 352 }
 353
 354 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 355 {
 356         gchar *file;
 357         gint drop_ok;
 358         MailReceiveData mail_receive_data;
 359
 360         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 361          * because some plugins may think that it has a C string. */
 362         mail_receive_data.session  = session;
 363         mail_receive_data.data     = g_new0(gchar, len + 1);
 364         mail_receive_data.data_len = len;
 365         memcpy(mail_receive_data.data, data, len);
 366
 367         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 368
 369         file = get_tmp_file();
 370         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 371                                    mail_receive_data.data_len, NULL) < 0) {
 372                 g_free(file);
 373                 g_free(mail_receive_data.data);
 374                 session->error_val = PS_IOERR;
 375                 return -1;
 376         }
 377         g_free(mail_receive_data.data);
 378
 379         if (session->msg[session->cur_msg].partial_recv
 380             == POP3_MUST_COMPLETE_RECV) {
 381                 gchar *old_file = partial_get_filename(
 382                                 session->ac_prefs->recv_server,
 383                                 session->ac_prefs->userid,
 384                                 session->msg[session->cur_msg].uidl);
 385
 386                 if (old_file) {
 387                         partial_delete_old(old_file);
 388                         g_free(old_file);
 389                 }
 390         }
 391
 392         /* drop_ok: 0: success 1: don't receive -1: error */
 393         drop_ok = session->drop_message(session, file);
 394
 395         g_free(file);
 396         if (drop_ok < 0) {
 397                 session->error_val = PS_IOERR;
 398                 return -1;
 399         }
 400
 401         session->cur_total_bytes += session->msg[session->cur_msg].size;
 402         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 403         session->cur_total_num++;
 404
 405         session->msg[session->cur_msg].received = TRUE;
 406         session->msg[session->cur_msg].partial_recv = POP3_TOTALLY_RECEIVED;
 407
 408         session->msg[session->cur_msg].recv_time =
 409                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 410
 411         return PS_SUCCESS;
 412 }
 413
 414 static gint pop3_top_send(Pop3Session *session, gint max_size)
 415 {
 416         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 417         session->state = POP3_TOP;
 418         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 419         return PS_SUCCESS;
 420 }
 421
 422 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 423 {
 424         gchar *file;
 425         gint drop_ok;
 426         MailReceiveData mail_receive_data;
 427         gchar *partial_notice = NULL;
 428
 429         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 430          * because some plugins may think that it has a C string. */
 431         mail_receive_data.session  = session;
 432         mail_receive_data.data     = g_new0(gchar, len + 1);
 433         mail_receive_data.data_len = len;
 434         memcpy(mail_receive_data.data, data, len);
 435
 436         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 437
 438         partial_notice = g_strdup_printf("SC-Marked-For-Download: 0\n"
 439                                          "SC-Partially-Retrieved: %s\n"
 440                                          "SC-Account-Server: %s\n"
 441                                          "SC-Account-Login: %s\n"
 442                                          "SC-Message-Size: %d",
 443                                          session->msg[session->cur_msg].uidl,
 444                                          session->ac_prefs->recv_server,
 445                                          session->ac_prefs->userid,
 446                                          session->msg[session->cur_msg].size);
 447         file = get_tmp_file();
 448         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 449                                    mail_receive_data.data_len,
 450                                    partial_notice) < 0) {
 451                 g_free(file);
 452                 g_free(mail_receive_data.data);
 453                 session->error_val = PS_IOERR;
 454                 g_free(partial_notice);
 455                 return -1;
 456         }
 457         g_free(mail_receive_data.data);
 458         g_free(partial_notice);
 459
 460         /* drop_ok: 0: success 1: don't receive -1: error */
 461         drop_ok = session->drop_message(session, file);
 462         g_free(file);
 463         if (drop_ok < 0) {
 464                 session->error_val = PS_IOERR;
 465                 return -1;
 466         }
 467
 468         session->cur_total_bytes += session->msg[session->cur_msg].size;
 469         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 470         session->cur_total_num++;
 471
 472         session->msg[session->cur_msg].received = TRUE;
 473         session->msg[session->cur_msg].partial_recv = POP3_PARTIALLY_RECEIVED;
 474         session->msg[session->cur_msg].recv_time =
 475                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 476
 477         return PS_SUCCESS;
 478 }
 479
 480 static gint pop3_delete_send(Pop3Session *session)
 481 {
 482         session->state = POP3_DELETE;
 483         pop3_gen_send(session, "DELE %d", session->cur_msg);
 484         return PS_SUCCESS;
 485 }
 486
 487 static gint pop3_delete_recv(Pop3Session *session)
 488 {
 489         session->msg[session->cur_msg].deleted = TRUE;
 490         return PS_SUCCESS;
 491 }
 492
 493 static gint pop3_logout_send(Pop3Session *session)
 494 {
 495         session->state = POP3_LOGOUT;
 496         pop3_gen_send(session, "QUIT");
 497         return PS_SUCCESS;
 498 }
 499
 500 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 501 {
 502         gchar buf[POPBUFSIZE + 1];
 503         va_list args;
 504
 505         va_start(args, format);
 506         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 507         va_end(args);
 508
 509         if (!g_ascii_strncasecmp(buf, "PASS ", 5))
 510                 log_print(LOG_PROTOCOL, "POP> PASS ********\n");
 511         else
 512                 log_print(LOG_PROTOCOL, "POP> %s\n", buf);
 513
 514         session_send_msg(SESSION(session), buf);
 515 }
 516
 517 Session *pop3_session_new(PrefsAccount *account)
 518 {
 519         Pop3Session *session;
 520
 521         cm_return_val_if_fail(account != NULL, NULL);
 522
 523         account->receive_in_progress = TRUE;
 524
 525         session = g_new0(Pop3Session, 1);
 526
 527         session_init(SESSION(session), account, FALSE);
 528
 529         SESSION(session)->type = SESSION_POP3;
 530
 531         SESSION(session)->recv_msg = pop3_session_recv_msg;
 532         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 533         SESSION(session)->send_data_finished = NULL;
 534         SESSION(session)->ssl_cert_auto_accept = account->ssl_certs_auto_accept;
 535         SESSION(session)->destroy = pop3_session_destroy;
 536
 537 #ifdef USE_GNUTLS
 538         if (account->set_gnutls_priority && account->gnutls_priority &&
 539                         strlen(account->gnutls_priority) != 0)
 540                 SESSION(session)->gnutls_priority = g_strdup(account->gnutls_priority);
 541         SESSION(session)->use_tls_sni = account->use_tls_sni;
 542 #endif
 543
 544         session->state = POP3_READY;
 545         session->ac_prefs = account;
 546         session->pop_before_smtp = FALSE;
 547         pop3_get_uidl_table(account, session);
 548         session->current_time = time(NULL);
 549         session->error_val = PS_SUCCESS;
 550         session->error_msg = NULL;
 551
 552         return SESSION(session);
 553 }
 554
 555 static void pop3_session_destroy(Session *session)
 556 {
 557         Pop3Session *pop3_session = POP3_SESSION(session);
 558         gint n;
 559
 560         cm_return_if_fail(session != NULL);
 561
 562         for (n = 1; n <= pop3_session->count; n++)
 563                 g_free(pop3_session->msg[n].uidl);
 564         g_free(pop3_session->msg);
 565
 566         if (pop3_session->uidl_table) {
 567                 hash_free_strings(pop3_session->uidl_table);
 568                 g_hash_table_destroy(pop3_session->uidl_table);
 569         }
 570
 571         if (pop3_session->partial_recv_table) {
 572                 hash_free_strings(pop3_session->partial_recv_table);
 573                 g_hash_table_destroy(pop3_session->partial_recv_table);
 574         }
 575
 576         g_free(pop3_session->greeting);
 577         g_free(pop3_session->user);
 578         g_free(pop3_session->pass);
 579         g_free(pop3_session->error_msg);
 580
 581         pop3_session->ac_prefs->receive_in_progress = FALSE;
 582 }
 583
 584 static void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session)
 585 {
 586         GHashTable *table;
 587         GHashTable *partial_recv_table;
 588         gchar *path;
 589         FILE *fp;
 590         gchar buf[POPBUFSIZE];
 591         gchar uidl[POPBUFSIZE];
 592         time_t recv_time;
 593         time_t now;
 594         gint partial_recv;
 595         gchar *sanitized_uid = g_strdup(ac_prefs->userid);
 596
 597         subst_for_filename(sanitized_uid);
 598
 599         table = g_hash_table_new(g_str_hash, g_str_equal);
 600         partial_recv_table = g_hash_table_new(g_str_hash, g_str_equal);
 601
 602         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 603                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 604                            "-", sanitized_uid, NULL);
 605
 606         g_free(sanitized_uid);
 607         if ((fp = claws_fopen(path, "rb")) == NULL) {
 608                 if (ENOENT != errno) FILE_OP_ERROR(path, "claws_fopen");
 609                 g_free(path);
 610                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 611                                    "uidl-", ac_prefs->recv_server,
 612                                    "-", ac_prefs->userid, NULL);
 613                 if ((fp = claws_fopen(path, "rb")) == NULL) {
 614                         if (ENOENT != errno) FILE_OP_ERROR(path, "claws_fopen");
 615                         g_free(path);
 616                         session->uidl_table = table;
 617                         session->partial_recv_table = partial_recv_table;
 618                         return;
 619                 }
 620         }
 621         g_free(path);
 622
 623         now = time(NULL);
 624
 625         while (claws_fgets(buf, sizeof(buf), fp) != NULL) {
 626                 gchar tmp[POPBUFSIZE];
 627                 strretchomp(buf);
 628                 recv_time = RECV_TIME_NONE;
 629                 partial_recv = POP3_TOTALLY_RECEIVED;
 630
 631                 if (sscanf(buf, "%s\t%ld\t%s", uidl, (long int *) &recv_time, tmp) < 3) {
 632                         if (sscanf(buf, "%s\t%ld", uidl, (long int *) &recv_time) != 2) {
 633                                 if (sscanf(buf, "%s", uidl) != 1)
 634                                         continue;
 635                                 else {
 636                                         recv_time = now;
 637                                         strcpy(tmp, "0");
 638                                 }
 639                         } else {
 640                                 strcpy(tmp, "0");
 641                         }
 642                 }
 643
 644                 if (recv_time == RECV_TIME_NONE)
 645                         recv_time = RECV_TIME_RECEIVED;
 646                 g_hash_table_insert(table, g_strdup(uidl),
 647                                     GINT_TO_POINTER(recv_time));
 648                 if (strlen(tmp) == 1)
 649                         partial_recv = atoi(tmp); /* totally received ?*/
 650                 else
 651                         partial_recv = POP3_MUST_COMPLETE_RECV;
 652
 653                 g_hash_table_insert(partial_recv_table, g_strdup(uidl),
 654                                     GINT_TO_POINTER(partial_recv));
 655         }
 656
 657         claws_fclose(fp);
 658         session->uidl_table = table;
 659         session->partial_recv_table = partial_recv_table;
 660
 661         return;
 662 }
 663
 664 #define TRY(func) \
 665 if (!(func)) \
 666 { \
 667         g_warning("failed to write"); \
 668         goto err_write;                 \
 669 } \
 670
 671 gint pop3_write_uidl_list(Pop3Session *session)
 672 {
 673         gchar *path, *tmp_path;
 674         FILE *fp;
 675         Pop3MsgInfo *msg;
 676         gint n;
 677         gchar *sanitized_uid = g_strdup(session->ac_prefs->userid);
 678
 679         subst_for_filename(sanitized_uid);
 680
 681         if (!session->uidl_is_valid) {
 682                 g_free(sanitized_uid);
 683                 return 0;
 684         }
 685
 686         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 687                            "uidl", G_DIR_SEPARATOR_S,
 688                            session->ac_prefs->recv_server,
 689                            "-", sanitized_uid, NULL);
 690         tmp_path = g_strconcat(path, ".tmp", NULL);
 691
 692         g_free(sanitized_uid);
 693
 694         if ((fp = claws_fopen(tmp_path, "wb")) == NULL) {
 695                 FILE_OP_ERROR(tmp_path, "claws_fopen");
 696                 goto err_write;
 697         }
 698
 699         for (n = 1; n <= session->count; n++) {
 700                 msg = &session->msg[n];
 701                 if (msg->uidl && msg->received &&
 702                     (!msg->deleted || session->state != POP3_DONE))
 703                         TRY(fprintf(fp, "%s\t%ld\t%d\n",
 704                                 msg->uidl, (long int)
 705                                 msg->recv_time,
 706                                 msg->partial_recv)
 707                             > 0);
 708         }
 709
 710         if (claws_safe_fclose(fp) == EOF) {
 711                 FILE_OP_ERROR(tmp_path, "claws_fclose");
 712                 fp = NULL;
 713                 goto err_write;
 714         }
 715         fp = NULL;
 716 #ifdef G_OS_WIN32
 717         claws_unlink(path);
 718 #endif
 719         if (g_rename(tmp_path, path) < 0) {
 720                 FILE_OP_ERROR(path, "rename");
 721                 goto err_write;
 722         }
 723         g_free(path);
 724         g_free(tmp_path);
 725         return 0;
 726 err_write:
 727         if (fp)
 728                 claws_fclose(fp);
 729         g_free(path);
 730         g_free(tmp_path);
 731         return -1;
 732 }
 733
 734 #undef TRY
 735
 736 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 737                                    guint len, const gchar *prefix)
 738 {
 739         FILE *fp;
 740         const gchar *prev, *cur;
 741
 742         cm_return_val_if_fail(file != NULL, -1);
 743
 744         if ((fp = claws_fopen(file, "wb")) == NULL) {
 745                 FILE_OP_ERROR(file, "claws_fopen");
 746                 return -1;
 747         }
 748
 749         if (change_file_mode_rw(fp, file) < 0)
 750                 FILE_OP_ERROR(file, "chmod");
 751
 752         if (prefix != NULL) {
 753                 if (fprintf(fp, "%s\n", prefix) < 0) {
 754                         FILE_OP_ERROR(file, "fprintf");
 755                         claws_fclose(fp);
 756                         claws_unlink(file);
 757                         return -1;
 758                 }
 759         }
 760
 761         /* +------------------+----------------+--------------------------+ *
 762          * ^data              ^prev            ^cur             data+len-1^ */
 763
 764         prev = data;
 765         while ((cur = (gchar *)my_memmem(prev, len - (prev - data), "\r\n", 2))
 766                != NULL) {
 767                 if ((cur > prev && claws_fwrite(prev, 1, cur - prev, fp) < 1) ||
 768                     claws_fputc('\n', fp) == EOF) {
 769                         FILE_OP_ERROR(file, "claws_fwrite");
 770                         g_warning("can't write to file: %s", file);
 771                         claws_fclose(fp);
 772                         claws_unlink(file);
 773                         return -1;
 774                 }
 775
 776                 if (cur == data + len - 1) {
 777                         prev = cur + 1;
 778                         break;
 779                 }
 780
 781                 if (*(cur + 1) == '\n')
 782                         prev = cur + 2;
 783                 else
 784                         prev = cur + 1;
 785
 786                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 787                         prev++;
 788
 789                 if (prev - data >= len)
 790                         break;
 791         }
 792
 793         if (prev - data < len &&
 794             claws_fwrite(prev, 1, len - (prev - data), fp) < 1) {
 795                 FILE_OP_ERROR(file, "claws_fwrite");
 796                 g_warning("can't write to file: %s", file);
 797                 claws_fclose(fp);
 798                 claws_unlink(file);
 799                 return -1;
 800         }
 801         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 802                 if (claws_fputc('\n', fp) == EOF) {
 803                         FILE_OP_ERROR(file, "claws_fputc");
 804                         g_warning("can't write to file: %s", file);
 805                         claws_fclose(fp);
 806                         claws_unlink(file);
 807                         return -1;
 808                 }
 809         }
 810
 811         if (claws_safe_fclose(fp) == EOF) {
 812                 FILE_OP_ERROR(file, "claws_fclose");
 813                 claws_unlink(file);
 814                 return -1;
 815         }
 816
 817         return 0;
 818 }
 819
 820 static Pop3State pop3_lookup_next(Pop3Session *session)
 821 {
 822         Pop3MsgInfo *msg;
 823         PrefsAccount *ac = session->ac_prefs;
 824         gint size;
 825         gboolean size_limit_over;
 826
 827         for (;;) {
 828                 msg = &session->msg[session->cur_msg];
 829                 size = msg->size;
 830                 size_limit_over =
 831                     (ac->enable_size_limit &&
 832                      ac->size_limit > 0 &&
 833                      size > ac->size_limit * 1024);
 834
 835                 if (ac->rmmail &&
 836                     msg->recv_time != RECV_TIME_NONE &&
 837                     msg->recv_time != RECV_TIME_KEEP &&
 838                     msg->partial_recv == POP3_TOTALLY_RECEIVED &&
 839                     session->current_time - msg->recv_time >=
 840                     ((ac->msg_leave_time * 24 * 60 * 60) +
 841                      (ac->msg_leave_hour * 60 * 60))) {
 842                         log_message(LOG_PROTOCOL,
 843                                         _("POP: Deleting expired message %d [%s]\n"),
 844                                         session->cur_msg, msg->uidl?msg->uidl:" ");
 845                         session->cur_total_bytes += size;
 846                         pop3_delete_send(session);
 847                         return POP3_DELETE;
 848                 }
 849
 850                 if (size_limit_over) {
 851                         if (!msg->received && msg->partial_recv !=
 852                             POP3_MUST_COMPLETE_RECV) {
 853                                 pop3_top_send(session, ac->size_limit);
 854                                 return POP3_TOP;
 855                         } else if (msg->partial_recv == POP3_MUST_COMPLETE_RECV)
 856                                 break;
 857
 858                         log_message(LOG_PROTOCOL,
 859                                         _("POP: Skipping message %d [%s] (%d bytes)\n"),
 860                                         session->cur_msg, msg->uidl?msg->uidl:" ", size);
 861                 }
 862
 863                 if (size == 0 || msg->received || size_limit_over) {
 864                         session->cur_total_bytes += size;
 865                         if (session->cur_msg == session->count) {
 866                                 pop3_logout_send(session);
 867                                 return POP3_LOGOUT;
 868                         } else
 869                                 session->cur_msg++;
 870                 } else
 871                         break;
 872         }
 873
 874         pop3_retr_send(session);
 875         return POP3_RETR;
 876 }
 877
 878 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 879 {
 880         Pop3ErrorValue ok;
 881
 882         log_print(LOG_PROTOCOL, "POP< %s\n", msg);
 883
 884         if (!strncmp(msg, "+OK", 3))
 885                 ok = PS_SUCCESS;
 886         else if (!strncmp(msg, "-ERR", 4)) {
 887                 if (strstr(msg + 4, "lock") ||
 888                     strstr(msg + 4, "Lock") ||
 889                     strstr(msg + 4, "LOCK") ||
 890                     strstr(msg + 4, "wait")) {
 891                         log_error(LOG_PROTOCOL, _("mailbox is locked\n"));
 892                         ok = PS_LOCKBUSY;
 893                 } else if (strcasestr(msg + 4, "timeout")) {
 894                         log_error(LOG_PROTOCOL, _("Session timeout\n"));
 895                         ok = PS_ERROR;
 896                 } else {
 897                         switch (session->state) {
 898 #ifdef USE_GNUTLS
 899                         case POP3_STLS:
 900                                 log_error(LOG_PROTOCOL, _("couldn't start STARTTLS session\n"));
 901                                 ok = PS_ERROR;
 902                                 break;
 903 #endif
 904                         case POP3_GETAUTH_USER:
 905                         case POP3_GETAUTH_PASS:
 906                         case POP3_GETAUTH_APOP:
 907                                 log_error(LOG_PROTOCOL, _("error occurred on authentication\n"));
 908                                 ok = PS_AUTHFAIL;
 909                                 break;
 910                         case POP3_GETRANGE_LAST:
 911                         case POP3_GETRANGE_UIDL:
 912                         case POP3_TOP:
 913                                 log_warning(LOG_PROTOCOL, _("command not supported\n"));
 914                                 ok = PS_NOTSUPPORTED;
 915                                 break;
 916
 917                         default:
 918                                 log_error(LOG_PROTOCOL, _("error occurred on POP session\n"));
 919                                 ok = PS_ERROR;
 920                         }
 921                 }
 922
 923                 g_free(session->error_msg);
 924                 session->error_msg = g_strdup(msg);
 925                 g_printerr("POP: %s\n", msg);
 926         } else
 927                 ok = PS_PROTOCOL;
 928
 929         session->error_val = ok;
 930         return ok;
 931 }
 932
 933 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 934 {
 935         Pop3Session *pop3_session = POP3_SESSION(session);
 936         Pop3ErrorValue val = PS_SUCCESS;
 937         const gchar *body;
 938
 939         body = msg;
 940         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 941             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 942                 val = pop3_ok(pop3_session, msg);
 943                 if (val != PS_SUCCESS) {
 944                         if (val != PS_NOTSUPPORTED) {
 945                                 pop3_session->state = POP3_ERROR;
 946                                 return -1;
 947                         }
 948                 }
 949
 950                 if (*body == '+' || *body == '-')
 951                         body++;
 952                 while (g_ascii_isalpha(*body))
 953                         body++;
 954                 while (g_ascii_isspace(*body))
 955                         body++;
 956         }
 957
 958         switch (pop3_session->state) {
 959         case POP3_READY:
 960         case POP3_GREETING:
 961                 pop3_greeting_recv(pop3_session, body);
 962 #ifdef USE_GNUTLS
 963                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 964                         val = pop3_stls_send(pop3_session);
 965                 else
 966 #endif
 967                 if (pop3_session->ac_prefs->use_apop_auth)
 968                         val = pop3_getauth_apop_send(pop3_session);
 969                 else
 970                         val = pop3_getauth_user_send(pop3_session);
 971                 break;
 972 #ifdef USE_GNUTLS
 973         case POP3_STLS:
 974                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 975                         return -1;
 976                 if (pop3_session->ac_prefs->use_apop_auth)
 977                         val = pop3_getauth_apop_send(pop3_session);
 978                 else
 979                         val = pop3_getauth_user_send(pop3_session);
 980                 break;
 981 #endif
 982         case POP3_GETAUTH_USER:
 983                 val = pop3_getauth_pass_send(pop3_session);
 984                 break;
 985         case POP3_GETAUTH_PASS:
 986         case POP3_GETAUTH_APOP:
 987                 if (!pop3_session->pop_before_smtp)
 988                         val = pop3_getrange_stat_send(pop3_session);
 989                 else
 990                         val = pop3_logout_send(pop3_session);
 991                 break;
 992         case POP3_GETRANGE_STAT:
 993                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 994                         return -1;
 995                 if (pop3_session->count > 0)
 996                         val = pop3_getrange_uidl_send(pop3_session);
 997                 else
 998                         val = pop3_logout_send(pop3_session);
 999                 break;
1000         case POP3_GETRANGE_LAST:
1001                 if (val == PS_NOTSUPPORTED)
1002                         pop3_session->error_val = PS_SUCCESS;
1003                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
1004                         return -1;
1005                 if (pop3_session->cur_msg > 0)
1006                         val = pop3_getsize_list_send(pop3_session);
1007                 else
1008                         val = pop3_logout_send(pop3_session);
1009                 break;
1010         case POP3_GETRANGE_UIDL:
1011                 if (val == PS_NOTSUPPORTED) {
1012                         pop3_session->error_val = PS_SUCCESS;
1013                         val = pop3_getrange_last_send(pop3_session);
1014                 } else {
1015                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
1016                         session_recv_data(session, 0, ".\r\n");
1017                 }
1018                 break;
1019         case POP3_GETSIZE_LIST:
1020                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
1021                 session_recv_data(session, 0, ".\r\n");
1022                 break;
1023         case POP3_RETR:
1024                 pop3_session->state = POP3_RETR_RECV;
1025                 session_recv_data(session, 0, ".\r\n");
1026                 break;
1027         case POP3_TOP:
1028                 if (val == PS_NOTSUPPORTED) {
1029                         pop3_session->error_val = PS_SUCCESS;
1030                 } else {
1031                         pop3_session->state = POP3_TOP_RECV;
1032                         session_recv_data(session, 0, ".\r\n");
1033                 }
1034                 break;
1035         case POP3_DELETE:
1036                 pop3_delete_recv(pop3_session);
1037                 if (pop3_session->cur_msg == pop3_session->count)
1038                         val = pop3_logout_send(pop3_session);
1039                 else {
1040                         pop3_session->cur_msg++;
1041                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1042                                 return -1;
1043                 }
1044                 break;
1045         case POP3_LOGOUT:
1046                 pop3_session->state = POP3_DONE;
1047                 session_disconnect(session);
1048                 break;
1049         case POP3_ERROR:
1050         default:
1051                 return -1;
1052         }
1053
1054         return val == PS_SUCCESS?0:-1;
1055 }
1056
1057 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
1058                                             guint len)
1059 {
1060         Pop3Session *pop3_session = POP3_SESSION(session);
1061         Pop3ErrorValue val = PS_SUCCESS;
1062
1063         switch (pop3_session->state) {
1064         case POP3_GETRANGE_UIDL_RECV:
1065                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
1066                 if (val == PS_SUCCESS) {
1067                         if (pop3_session->new_msg_exist)
1068                                 pop3_getsize_list_send(pop3_session);
1069                         else
1070                                 pop3_logout_send(pop3_session);
1071                 } else
1072                         return -1;
1073                 break;
1074         case POP3_GETSIZE_LIST_RECV:
1075                 val = pop3_getsize_list_recv(pop3_session, data, len);
1076                 if (val == PS_SUCCESS) {
1077                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1078                                 return -1;
1079                 } else
1080                         return -1;
1081                 break;
1082         case POP3_RETR_RECV:
1083                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1084                         return -1;
1085
1086                 if (pop3_session->ac_prefs->rmmail &&
1087                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1088                     pop3_session->ac_prefs->msg_leave_hour == 0 &&
1089                     pop3_session->msg[pop3_session->cur_msg].recv_time
1090                     != RECV_TIME_KEEP)
1091                         pop3_delete_send(pop3_session);
1092                 else if (pop3_session->cur_msg == pop3_session->count)
1093                         pop3_logout_send(pop3_session);
1094                 else {
1095                         pop3_session->cur_msg++;
1096                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1097                                 return -1;
1098                 }
1099                 break;
1100         case POP3_TOP_RECV:
1101                 if (pop3_top_recv(pop3_session, data, len) < 0)
1102                         return -1;
1103
1104                 if (pop3_session->cur_msg == pop3_session->count)
1105                         pop3_logout_send(pop3_session);
1106                 else {
1107                         pop3_session->cur_msg++;
1108                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1109                                 return -1;
1110                 }
1111                 break;
1112         case POP3_TOP:
1113                 log_warning(LOG_PROTOCOL, _("TOP command unsupported\n"));
1114                 if (pop3_session->cur_msg == pop3_session->count)
1115                         pop3_logout_send(pop3_session);
1116                 else {
1117                         pop3_session->cur_msg++;
1118                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1119                                 return -1;
1120                 }
1121                 break;
1122         case POP3_ERROR:
1123         default:
1124                 return -1;
1125         }
1126
1127         return 0;
1128 }