src/pop.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 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 #endif
  23
  24 #include <glib.h>
  25 #include <glib/gi18n.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <stdarg.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <errno.h>
  33
  34 #include "pop.h"
  35 #include "md5.h"
  36 #include "prefs_account.h"
  37 #include "utils.h"
  38 #include "recv.h"
  39 #include "partial_download.h"
  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 (defined(USE_OPENSSL) || defined (USE_GNUTLS))
  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 static void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session);
  94
  95 static gint pop3_greeting_recv(Pop3Session *session, const gchar *msg)
  96 {
  97         session->state = POP3_GREETING;
  98
  99         session->greeting = g_strdup(msg);
 100         return PS_SUCCESS;
 101 }
 102
 103 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
 104 static gint pop3_stls_send(Pop3Session *session)
 105 {
 106         session->state = POP3_STLS;
 107         pop3_gen_send(session, "STLS");
 108         return PS_SUCCESS;
 109 }
 110
 111 static gint pop3_stls_recv(Pop3Session *session)
 112 {
 113         if (session_start_tls(SESSION(session)) < 0) {
 114                 session->error_val = PS_SOCKET;
 115                 return -1;
 116         }
 117         return PS_SUCCESS;
 118 }
 119 #endif /* USE_OPENSSL */
 120
 121 static gint pop3_getauth_user_send(Pop3Session *session)
 122 {
 123         g_return_val_if_fail(session->user != NULL, -1);
 124
 125         session->state = POP3_GETAUTH_USER;
 126         pop3_gen_send(session, "USER %s", session->user);
 127         return PS_SUCCESS;
 128 }
 129
 130 static gint pop3_getauth_pass_send(Pop3Session *session)
 131 {
 132         g_return_val_if_fail(session->pass != NULL, -1);
 133
 134         session->state = POP3_GETAUTH_PASS;
 135         pop3_gen_send(session, "PASS %s", session->pass);
 136         return PS_SUCCESS;
 137 }
 138
 139 static gint pop3_getauth_apop_send(Pop3Session *session)
 140 {
 141         gchar *start, *end;
 142         gchar *apop_str;
 143         gchar md5sum[33];
 144
 145         g_return_val_if_fail(session->user != NULL, -1);
 146         g_return_val_if_fail(session->pass != NULL, -1);
 147
 148         session->state = POP3_GETAUTH_APOP;
 149
 150         if ((start = strchr(session->greeting, '<')) == NULL) {
 151                 log_error(LOG_PROTOCOL, _("Required APOP timestamp not found "
 152                             "in greeting\n"));
 153                 session->error_val = PS_PROTOCOL;
 154                 return -1;
 155         }
 156
 157         if ((end = strchr(start, '>')) == NULL || end == start + 1) {
 158                 log_error(LOG_PROTOCOL, _("Timestamp syntax error in greeting\n"));
 159                 session->error_val = PS_PROTOCOL;
 160                 return -1;
 161         }
 162         *(end + 1) = '\0';
 163
 164         if (!is_ascii_str(start)) {
 165                 log_error(LOG_PROTOCOL, _("Timestamp syntax error in greeting (not ASCII)\n"));
 166                 session->error_val = PS_PROTOCOL;
 167                 return -1;
 168         }
 169
 170         apop_str = g_strconcat(start, session->pass, NULL);
 171         md5_hex_digest(md5sum, apop_str);
 172         g_free(apop_str);
 173
 174         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 175
 176         return PS_SUCCESS;
 177 }
 178
 179 static gint pop3_getrange_stat_send(Pop3Session *session)
 180 {
 181         session->state = POP3_GETRANGE_STAT;
 182         pop3_gen_send(session, "STAT");
 183         return PS_SUCCESS;
 184 }
 185
 186 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 187 {
 188         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 189                 log_error(LOG_PROTOCOL, _("POP3 protocol error\n"));
 190                 session->error_val = PS_PROTOCOL;
 191                 return -1;
 192         } else {
 193                 if (session->count == 0) {
 194                         session->uidl_is_valid = TRUE;
 195                 } else {
 196                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 197                         session->cur_msg = 1;
 198                 }
 199         }
 200
 201         return PS_SUCCESS;
 202 }
 203
 204 static gint pop3_getrange_last_send(Pop3Session *session)
 205 {
 206         session->state = POP3_GETRANGE_LAST;
 207         pop3_gen_send(session, "LAST");
 208         return PS_SUCCESS;
 209 }
 210
 211 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 212 {
 213         gint last;
 214
 215         if (sscanf(msg, "%d", &last) == 0) {
 216                 log_warning(LOG_PROTOCOL, _("POP3 protocol error\n"));
 217                 session->error_val = PS_PROTOCOL;
 218                 return -1;
 219         } else {
 220                 if (session->count > last) {
 221                         session->new_msg_exist = TRUE;
 222                         session->cur_msg = last + 1;
 223                 } else
 224                         session->cur_msg = 0;
 225         }
 226
 227         return PS_SUCCESS;
 228 }
 229
 230 static gint pop3_getrange_uidl_send(Pop3Session *session)
 231 {
 232         session->state = POP3_GETRANGE_UIDL;
 233         pop3_gen_send(session, "UIDL");
 234         return PS_SUCCESS;
 235 }
 236
 237 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *data,
 238                                     guint len)
 239 {
 240         gchar id[IDLEN + 1];
 241         gchar buf[POPBUFSIZE];
 242         gint buf_len;
 243         guint32 num;
 244         time_t recv_time;
 245         gint partial_recv;
 246         const gchar *p = data;
 247         const gchar *lastp = data + len;
 248         const gchar *newline;
 249
 250         while (p < lastp) {
 251                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 252                         return -1;
 253                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 254                 memcpy(buf, p, buf_len);
 255                 buf[buf_len] = '\0';
 256
 257                 p = newline + 1;
 258                 if (p < lastp && *p == '\n') p++;
 259
 260                 if (sscanf(buf, "%d %" Xstr(IDLEN) "s", &num, id) != 2 ||
 261                     num <= 0 || num > session->count) {
 262                         log_warning(LOG_PROTOCOL, _("invalid UIDL response: %s\n"), buf);
 263                         continue;
 264                 }
 265
 266                 session->msg[num].uidl = g_strdup(id);
 267
 268                 recv_time = (time_t)(GPOINTER_TO_INT(g_hash_table_lookup(
 269                                         session->uidl_table, id)));
 270                 session->msg[num].recv_time = recv_time;
 271
 272                 if (recv_time != RECV_TIME_NONE) {
 273                         debug_print("num %d uidl %s: already got it\n", num, id);
 274                 } else {
 275                         debug_print("num %d uidl %s: unknown\n", num, id);
 276                 }
 277
 278                 partial_recv = (gint)(GPOINTER_TO_INT(g_hash_table_lookup(
 279                                         session->partial_recv_table, id)));
 280
 281                 if (recv_time != RECV_TIME_NONE
 282                 || partial_recv != POP3_TOTALLY_RECEIVED) {
 283                         session->msg[num].received =
 284                                 (partial_recv != POP3_MUST_COMPLETE_RECV);
 285                         session->msg[num].partial_recv = partial_recv;
 286                         if (partial_recv == POP3_MUST_COMPLETE_RECV)
 287                                 session->new_msg_exist = TRUE;
 288                 }
 289                 if (!session->new_msg_exist &&
 290                     (recv_time == RECV_TIME_NONE ||
 291                      session->ac_prefs->rmmail)) {
 292                         session->cur_msg = num;
 293                         session->new_msg_exist = TRUE;
 294                 }
 295         }
 296
 297         session->uidl_is_valid = TRUE;
 298         return PS_SUCCESS;
 299 }
 300
 301 static gint pop3_getsize_list_send(Pop3Session *session)
 302 {
 303         session->state = POP3_GETSIZE_LIST;
 304         pop3_gen_send(session, "LIST");
 305         return PS_SUCCESS;
 306 }
 307
 308 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 309                                    guint len)
 310 {
 311         gchar buf[POPBUFSIZE];
 312         gint buf_len;
 313         guint num, size;
 314         const gchar *p = data;
 315         const gchar *lastp = data + len;
 316         const gchar *newline;
 317
 318         while (p < lastp) {
 319                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 320                         return -1;
 321                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 322                 memcpy(buf, p, buf_len);
 323                 buf[buf_len] = '\0';
 324
 325                 p = newline + 1;
 326                 if (p < lastp && *p == '\n') p++;
 327
 328                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 329                         session->error_val = PS_PROTOCOL;
 330                         return -1;
 331                 }
 332
 333                 if (num > 0 && num <= session->count)
 334                         session->msg[num].size = size;
 335                 if (num > 0 && num < session->cur_msg)
 336                         session->cur_total_bytes += size;
 337         }
 338
 339         return PS_SUCCESS;
 340 }
 341
 342 static gint pop3_retr_send(Pop3Session *session)
 343 {
 344         session->state = POP3_RETR;
 345         debug_print("retrieving %d [%s]\n", session->cur_msg,
 346                 session->msg[session->cur_msg].uidl ?
 347                  session->msg[session->cur_msg].uidl:" ");
 348         pop3_gen_send(session, "RETR %d", session->cur_msg);
 349         return PS_SUCCESS;
 350 }
 351
 352 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 353 {
 354         gchar *file;
 355         gint drop_ok;
 356         MailReceiveData mail_receive_data;
 357
 358         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 359          * because some plugins may think that it has a C string. */
 360         mail_receive_data.session  = session;
 361         mail_receive_data.data     = g_new0(gchar, len + 1);
 362         mail_receive_data.data_len = len;
 363         memcpy(mail_receive_data.data, data, len);
 364
 365         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 366
 367         file = get_tmp_file();
 368         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 369                                    mail_receive_data.data_len, NULL) < 0) {
 370                 g_free(file);
 371                 g_free(mail_receive_data.data);
 372                 session->error_val = PS_IOERR;
 373                 return -1;
 374         }
 375         g_free(mail_receive_data.data);
 376
 377         if (session->msg[session->cur_msg].partial_recv
 378             == POP3_MUST_COMPLETE_RECV) {
 379                 gchar *old_file = partial_get_filename(
 380                                 session->ac_prefs->recv_server,
 381                                 session->ac_prefs->userid,
 382                                 session->msg[session->cur_msg].uidl);
 383
 384                 if (old_file) {
 385                         partial_delete_old(old_file);
 386                         g_free(old_file);
 387                 }
 388         }
 389
 390         /* drop_ok: 0: success 1: don't receive -1: error */
 391         drop_ok = session->drop_message(session, file);
 392
 393         g_free(file);
 394         if (drop_ok < 0) {
 395                 session->error_val = PS_IOERR;
 396                 return -1;
 397         }
 398
 399         session->cur_total_bytes += session->msg[session->cur_msg].size;
 400         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 401         session->cur_total_num++;
 402
 403         session->msg[session->cur_msg].received = TRUE;
 404         session->msg[session->cur_msg].partial_recv = POP3_TOTALLY_RECEIVED;
 405
 406         session->msg[session->cur_msg].recv_time =
 407                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 408
 409         return PS_SUCCESS;
 410 }
 411
 412 static gint pop3_top_send(Pop3Session *session, gint max_size)
 413 {
 414         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 415         session->state = POP3_TOP;
 416         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 417         return PS_SUCCESS;
 418 }
 419
 420 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 421 {
 422         gchar *file;
 423         gint drop_ok;
 424         MailReceiveData mail_receive_data;
 425         gchar *partial_notice = NULL;
 426
 427         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 428          * because some plugins may think that it has a C string. */
 429         mail_receive_data.session  = session;
 430         mail_receive_data.data     = g_new0(gchar, len + 1);
 431         mail_receive_data.data_len = len;
 432         memcpy(mail_receive_data.data, data, len);
 433
 434         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 435
 436         partial_notice = g_strdup_printf("SC-Marked-For-Download: 0\n"
 437                                          "SC-Partially-Retrieved: %s\n"
 438                                          "SC-Account-Server: %s\n"
 439                                          "SC-Account-Login: %s\n"
 440                                          "SC-Message-Size: %d",
 441                                          session->msg[session->cur_msg].uidl,
 442                                          session->ac_prefs->recv_server,
 443                                          session->ac_prefs->userid,
 444                                          session->msg[session->cur_msg].size);
 445         file = get_tmp_file();
 446         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 447                                    mail_receive_data.data_len,
 448                                    partial_notice) < 0) {
 449                 g_free(file);
 450                 g_free(mail_receive_data.data);
 451                 session->error_val = PS_IOERR;
 452                 g_free(partial_notice);
 453                 return -1;
 454         }
 455         g_free(mail_receive_data.data);
 456         g_free(partial_notice);
 457
 458         /* drop_ok: 0: success 1: don't receive -1: error */
 459         drop_ok = session->drop_message(session, file);
 460         g_free(file);
 461         if (drop_ok < 0) {
 462                 session->error_val = PS_IOERR;
 463                 return -1;
 464         }
 465
 466         session->cur_total_bytes += session->msg[session->cur_msg].size;
 467         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 468         session->cur_total_num++;
 469
 470         session->msg[session->cur_msg].received = TRUE;
 471         session->msg[session->cur_msg].partial_recv = POP3_PARTIALLY_RECEIVED;
 472         session->msg[session->cur_msg].recv_time =
 473                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 474
 475         return PS_SUCCESS;
 476 }
 477
 478 static gint pop3_delete_send(Pop3Session *session)
 479 {
 480         session->state = POP3_DELETE;
 481         pop3_gen_send(session, "DELE %d", session->cur_msg);
 482         return PS_SUCCESS;
 483 }
 484
 485 static gint pop3_delete_recv(Pop3Session *session)
 486 {
 487         session->msg[session->cur_msg].deleted = TRUE;
 488         return PS_SUCCESS;
 489 }
 490
 491 static gint pop3_logout_send(Pop3Session *session)
 492 {
 493         session->state = POP3_LOGOUT;
 494         pop3_gen_send(session, "QUIT");
 495         return PS_SUCCESS;
 496 }
 497
 498 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 499 {
 500         gchar buf[POPBUFSIZE + 1];
 501         va_list args;
 502
 503         va_start(args, format);
 504         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 505         va_end(args);
 506
 507         if (!g_ascii_strncasecmp(buf, "PASS ", 5))
 508                 log_print(LOG_PROTOCOL, "POP3> PASS ********\n");
 509         else
 510                 log_print(LOG_PROTOCOL, "POP3> %s\n", buf);
 511
 512         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 513 }
 514
 515 Session *pop3_session_new(PrefsAccount *account)
 516 {
 517         Pop3Session *session;
 518
 519         g_return_val_if_fail(account != NULL, NULL);
 520
 521         session = g_new0(Pop3Session, 1);
 522
 523         session_init(SESSION(session));
 524
 525         SESSION(session)->type = SESSION_POP3;
 526
 527         SESSION(session)->recv_msg = pop3_session_recv_msg;
 528         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 529         SESSION(session)->send_data_finished = NULL;
 530
 531         SESSION(session)->destroy = pop3_session_destroy;
 532
 533         session->state = POP3_READY;
 534         session->ac_prefs = account;
 535         session->pop_before_smtp = FALSE;
 536         pop3_get_uidl_table(account, session);
 537         session->current_time = time(NULL);
 538         session->error_val = PS_SUCCESS;
 539         session->error_msg = NULL;
 540
 541         return SESSION(session);
 542 }
 543
 544 static void pop3_session_destroy(Session *session)
 545 {
 546         Pop3Session *pop3_session = POP3_SESSION(session);
 547         gint n;
 548
 549         g_return_if_fail(session != NULL);
 550
 551         for (n = 1; n <= pop3_session->count; n++)
 552                 g_free(pop3_session->msg[n].uidl);
 553         g_free(pop3_session->msg);
 554
 555         if (pop3_session->uidl_table) {
 556                 hash_free_strings(pop3_session->uidl_table);
 557                 g_hash_table_destroy(pop3_session->uidl_table);
 558         }
 559
 560         if (pop3_session->partial_recv_table) {
 561                 hash_free_strings(pop3_session->partial_recv_table);
 562                 g_hash_table_destroy(pop3_session->partial_recv_table);
 563         }
 564
 565         g_free(pop3_session->greeting);
 566         g_free(pop3_session->user);
 567         g_free(pop3_session->pass);
 568         g_free(pop3_session->error_msg);
 569 }
 570
 571 static void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session)
 572 {
 573         GHashTable *table;
 574         GHashTable *partial_recv_table;
 575         gchar *path;
 576         FILE *fp;
 577         gchar buf[POPBUFSIZE];
 578         gchar uidl[POPBUFSIZE];
 579         time_t recv_time;
 580         time_t now;
 581         gint partial_recv;
 582         gchar *sanitized_uid = g_strdup(ac_prefs->userid);
 583
 584         subst_for_filename(sanitized_uid);
 585
 586         table = g_hash_table_new(g_str_hash, g_str_equal);
 587         partial_recv_table = g_hash_table_new(g_str_hash, g_str_equal);
 588
 589         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 590                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 591                            "-", sanitized_uid, NULL);
 592
 593         g_free(sanitized_uid);
 594         if ((fp = g_fopen(path, "rb")) == NULL) {
 595                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 596                 g_free(path);
 597                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 598                                    "uidl-", ac_prefs->recv_server,
 599                                    "-", ac_prefs->userid, NULL);
 600                 if ((fp = g_fopen(path, "rb")) == NULL) {
 601                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 602                         g_free(path);
 603                         session->uidl_table = table;
 604                         session->partial_recv_table = partial_recv_table;
 605                         return;
 606                 }
 607         }
 608         g_free(path);
 609
 610         now = time(NULL);
 611
 612         while (fgets(buf, sizeof(buf), fp) != NULL) {
 613                 gchar tmp[POPBUFSIZE];
 614                 strretchomp(buf);
 615                 recv_time = RECV_TIME_NONE;
 616                 partial_recv = POP3_TOTALLY_RECEIVED;
 617
 618                 if (sscanf(buf, "%s\t%ld\t%s", uidl, (long int *) &recv_time, tmp) < 3) {
 619                         if (sscanf(buf, "%s\t%ld", uidl, (long int *) &recv_time) != 2) {
 620                                 if (sscanf(buf, "%s", uidl) != 1)
 621                                         continue;
 622                                 else {
 623                                         recv_time = now;
 624                                         strcpy(tmp, "0");
 625                                 }
 626                         } else {
 627                                 strcpy(tmp, "0");
 628                         }
 629                 }
 630
 631                 if (recv_time == RECV_TIME_NONE)
 632                         recv_time = RECV_TIME_RECEIVED;
 633                 g_hash_table_insert(table, g_strdup(uidl),
 634                                     GINT_TO_POINTER(recv_time));
 635                 if (strlen(tmp) == 1)
 636                         partial_recv = atoi(tmp); /* totally received ?*/
 637                 else
 638                         partial_recv = POP3_MUST_COMPLETE_RECV;
 639
 640                 g_hash_table_insert(partial_recv_table, g_strdup(uidl),
 641                                     GINT_TO_POINTER(partial_recv));
 642         }
 643
 644         fclose(fp);
 645         session->uidl_table = table;
 646         session->partial_recv_table = partial_recv_table;
 647
 648         return;
 649 }
 650
 651 #define TRY(func) \
 652 if (!(func)) \
 653 { \
 654         g_warning("failed to write\n"); \
 655         goto err_write;                 \
 656 } \
 657
 658 gint pop3_write_uidl_list(Pop3Session *session)
 659 {
 660         gchar *path, *tmp_path;
 661         FILE *fp;
 662         Pop3MsgInfo *msg;
 663         gint n;
 664         gchar *sanitized_uid = g_strdup(session->ac_prefs->userid);
 665
 666         subst_for_filename(sanitized_uid);
 667
 668
 669         if (!session->uidl_is_valid) return 0;
 670
 671         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 672                            "uidl", G_DIR_SEPARATOR_S,
 673                            session->ac_prefs->recv_server,
 674                            "-", sanitized_uid, NULL);
 675         tmp_path = g_strconcat(path, ".tmp", NULL);
 676
 677         g_free(sanitized_uid);
 678
 679         if ((fp = g_fopen(tmp_path, "wb")) == NULL) {
 680                 FILE_OP_ERROR(tmp_path, "fopen");
 681                 goto err_write;
 682         }
 683
 684         for (n = 1; n <= session->count; n++) {
 685                 msg = &session->msg[n];
 686                 if (msg->uidl && msg->received &&
 687                     (!msg->deleted || session->state != POP3_DONE))
 688                         TRY(fprintf(fp, "%s\t%ld\t%d\n",
 689                                 msg->uidl, (long int)
 690                                 msg->recv_time,
 691                                 msg->partial_recv)
 692                             > 0);
 693         }
 694
 695         if (fclose(fp) == EOF) {
 696                 FILE_OP_ERROR(tmp_path, "fclose");
 697                 fp = NULL;
 698                 goto err_write;
 699         }
 700         fp = NULL;
 701 #ifdef G_OS_WIN32
 702         g_unlink(path);
 703 #endif
 704         if (g_rename(tmp_path, path) < 0) {
 705                 FILE_OP_ERROR(path, "rename");
 706                 goto err_write;
 707         }
 708         g_free(path);
 709         g_free(tmp_path);
 710         return 0;
 711 err_write:
 712         if (fp)
 713                 fclose(fp);
 714         g_free(path);
 715         g_free(tmp_path);
 716         return -1;
 717 }
 718
 719 #undef TRY
 720
 721 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 722                                    guint len, const gchar *prefix)
 723 {
 724         FILE *fp;
 725         const gchar *prev, *cur;
 726
 727         g_return_val_if_fail(file != NULL, -1);
 728
 729         if ((fp = g_fopen(file, "wb")) == NULL) {
 730                 FILE_OP_ERROR(file, "fopen");
 731                 return -1;
 732         }
 733
 734         if (change_file_mode_rw(fp, file) < 0)
 735                 FILE_OP_ERROR(file, "chmod");
 736
 737         if (prefix != NULL) {
 738                 if (fprintf(fp, "%s\n", prefix) < 0) {
 739                         FILE_OP_ERROR(file, "fprintf");
 740                         fclose(fp);
 741                         g_unlink(file);
 742                         return -1;
 743                 }
 744         }
 745
 746         /* +------------------+----------------+--------------------------+ *
 747          * ^data              ^prev            ^cur             data+len-1^ */
 748
 749         prev = data;
 750         while ((cur = (gchar *)my_memmem(prev, len - (prev - data), "\r\n", 2))
 751                != NULL) {
 752                 if ((cur > prev && fwrite(prev, 1, cur - prev, fp) < 1) ||
 753                     fputc('\n', fp) == EOF) {
 754                         FILE_OP_ERROR(file, "fwrite");
 755                         g_warning("can't write to file: %s\n", file);
 756                         fclose(fp);
 757                         g_unlink(file);
 758                         return -1;
 759                 }
 760
 761                 if (cur == data + len - 1) {
 762                         prev = cur + 1;
 763                         break;
 764                 }
 765
 766                 if (*(cur + 1) == '\n')
 767                         prev = cur + 2;
 768                 else
 769                         prev = cur + 1;
 770
 771                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 772                         prev++;
 773
 774                 if (prev - data >= len)
 775                         break;
 776         }
 777
 778         if (prev - data < len &&
 779             fwrite(prev, 1, len - (prev - data), fp) < 1) {
 780                 FILE_OP_ERROR(file, "fwrite");
 781                 g_warning("can't write to file: %s\n", file);
 782                 fclose(fp);
 783                 g_unlink(file);
 784                 return -1;
 785         }
 786         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 787                 if (fputc('\n', fp) == EOF) {
 788                         FILE_OP_ERROR(file, "fputc");
 789                         g_warning("can't write to file: %s\n", file);
 790                         fclose(fp);
 791                         g_unlink(file);
 792                         return -1;
 793                 }
 794         }
 795
 796         if (fclose(fp) == EOF) {
 797                 FILE_OP_ERROR(file, "fclose");
 798                 g_unlink(file);
 799                 return -1;
 800         }
 801
 802         return 0;
 803 }
 804
 805 static Pop3State pop3_lookup_next(Pop3Session *session)
 806 {
 807         Pop3MsgInfo *msg;
 808         PrefsAccount *ac = session->ac_prefs;
 809         gint size;
 810         gboolean size_limit_over;
 811
 812         for (;;) {
 813                 msg = &session->msg[session->cur_msg];
 814                 size = msg->size;
 815                 size_limit_over =
 816                     (ac->enable_size_limit &&
 817                      ac->size_limit > 0 &&
 818                      size > ac->size_limit * 1024);
 819
 820                 if (ac->rmmail &&
 821                     msg->recv_time != RECV_TIME_NONE &&
 822                     msg->recv_time != RECV_TIME_KEEP &&
 823                     msg->partial_recv == POP3_TOTALLY_RECEIVED &&
 824                     session->current_time - msg->recv_time >=
 825                     ac->msg_leave_time * 24 * 60 * 60) {
 826                         log_message(LOG_PROTOCOL,
 827                                         _("POP3: Deleting expired message %d [%s]\n"),
 828                                         session->cur_msg, msg->uidl?msg->uidl:" ");
 829                         session->cur_total_bytes += size;
 830                         pop3_delete_send(session);
 831                         return POP3_DELETE;
 832                 }
 833
 834                 if (size_limit_over) {
 835                         if (!msg->received && msg->partial_recv !=
 836                             POP3_MUST_COMPLETE_RECV) {
 837                                 pop3_top_send(session, ac->size_limit);
 838                                 return POP3_TOP;
 839                         } else if (msg->partial_recv == POP3_MUST_COMPLETE_RECV)
 840                                 break;
 841
 842                         log_message(LOG_PROTOCOL,
 843                                         _("POP3: Skipping message %d [%s] (%d bytes)\n"),
 844                                         session->cur_msg, msg->uidl?msg->uidl:" ", size);
 845                 }
 846
 847                 if (size == 0 || msg->received || size_limit_over) {
 848                         session->cur_total_bytes += size;
 849                         if (session->cur_msg == session->count) {
 850                                 pop3_logout_send(session);
 851                                 return POP3_LOGOUT;
 852                         } else
 853                                 session->cur_msg++;
 854                 } else
 855                         break;
 856         }
 857
 858         pop3_retr_send(session);
 859         return POP3_RETR;
 860 }
 861
 862 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 863 {
 864         Pop3ErrorValue ok;
 865
 866         log_print(LOG_PROTOCOL, "POP3< %s\n", msg);
 867
 868         if (!strncmp(msg, "+OK", 3))
 869                 ok = PS_SUCCESS;
 870         else if (!strncmp(msg, "-ERR", 4)) {
 871                 if (strstr(msg + 4, "lock") ||
 872                     strstr(msg + 4, "Lock") ||
 873                     strstr(msg + 4, "LOCK") ||
 874                     strstr(msg + 4, "wait")) {
 875                         log_error(LOG_PROTOCOL, _("mailbox is locked\n"));
 876                         ok = PS_LOCKBUSY;
 877                 } else if (strcasestr(msg + 4, "timeout")) {
 878                         log_error(LOG_PROTOCOL, _("Session timeout\n"));
 879                         ok = PS_ERROR;
 880                 } else {
 881                         switch (session->state) {
 882 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
 883                         case POP3_STLS:
 884                                 log_error(LOG_PROTOCOL, _("couldn't start TLS session\n"));
 885                                 ok = PS_ERROR;
 886                                 break;
 887 #endif
 888                         case POP3_GETAUTH_USER:
 889                         case POP3_GETAUTH_PASS:
 890                         case POP3_GETAUTH_APOP:
 891                                 log_error(LOG_PROTOCOL, _("error occurred on authentication\n"));
 892                                 ok = PS_AUTHFAIL;
 893                                 break;
 894                         case POP3_GETRANGE_LAST:
 895                         case POP3_GETRANGE_UIDL:
 896                         case POP3_TOP:
 897                                 log_warning(LOG_PROTOCOL, _("command not supported\n"));
 898                                 ok = PS_NOTSUPPORTED;
 899                                 break;
 900
 901                         default:
 902                                 log_error(LOG_PROTOCOL, _("error occurred on POP3 session\n"));
 903                                 ok = PS_ERROR;
 904                         }
 905                 }
 906
 907                 g_free(session->error_msg);
 908                 session->error_msg = g_strdup(msg);
 909                 g_printerr("POP3: %s\n", msg);
 910         } else
 911                 ok = PS_PROTOCOL;
 912
 913         session->error_val = ok;
 914         return ok;
 915 }
 916
 917 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 918 {
 919         Pop3Session *pop3_session = POP3_SESSION(session);
 920         Pop3ErrorValue val = PS_SUCCESS;
 921         const gchar *body;
 922
 923         body = msg;
 924         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 925             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 926                 val = pop3_ok(pop3_session, msg);
 927                 if (val != PS_SUCCESS) {
 928                         if (val != PS_NOTSUPPORTED) {
 929                                 pop3_session->state = POP3_ERROR;
 930                                 return -1;
 931                         }
 932                 }
 933
 934                 if (*body == '+' || *body == '-')
 935                         body++;
 936                 while (g_ascii_isalpha(*body))
 937                         body++;
 938                 while (g_ascii_isspace(*body))
 939                         body++;
 940         }
 941
 942         switch (pop3_session->state) {
 943         case POP3_READY:
 944         case POP3_GREETING:
 945                 pop3_greeting_recv(pop3_session, body);
 946 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
 947                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 948                         val = pop3_stls_send(pop3_session);
 949                 else
 950 #endif
 951                 if (pop3_session->ac_prefs->use_apop_auth)
 952                         val = pop3_getauth_apop_send(pop3_session);
 953                 else
 954                         val = pop3_getauth_user_send(pop3_session);
 955                 break;
 956 #if (defined(USE_OPENSSL) || defined (USE_GNUTLS))
 957         case POP3_STLS:
 958                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 959                         return -1;
 960                 if (pop3_session->ac_prefs->use_apop_auth)
 961                         val = pop3_getauth_apop_send(pop3_session);
 962                 else
 963                         val = pop3_getauth_user_send(pop3_session);
 964                 break;
 965 #endif
 966         case POP3_GETAUTH_USER:
 967                 val = pop3_getauth_pass_send(pop3_session);
 968                 break;
 969         case POP3_GETAUTH_PASS:
 970         case POP3_GETAUTH_APOP:
 971                 if (!pop3_session->pop_before_smtp)
 972                         val = pop3_getrange_stat_send(pop3_session);
 973                 else
 974                         val = pop3_logout_send(pop3_session);
 975                 break;
 976         case POP3_GETRANGE_STAT:
 977                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 978                         return -1;
 979                 if (pop3_session->count > 0)
 980                         val = pop3_getrange_uidl_send(pop3_session);
 981                 else
 982                         val = pop3_logout_send(pop3_session);
 983                 break;
 984         case POP3_GETRANGE_LAST:
 985                 if (val == PS_NOTSUPPORTED)
 986                         pop3_session->error_val = PS_SUCCESS;
 987                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 988                         return -1;
 989                 if (pop3_session->cur_msg > 0)
 990                         val = pop3_getsize_list_send(pop3_session);
 991                 else
 992                         val = pop3_logout_send(pop3_session);
 993                 break;
 994         case POP3_GETRANGE_UIDL:
 995                 if (val == PS_NOTSUPPORTED) {
 996                         pop3_session->error_val = PS_SUCCESS;
 997                         val = pop3_getrange_last_send(pop3_session);
 998                 } else {
 999                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
1000                         session_recv_data(session, 0, ".\r\n");
1001                 }
1002                 break;
1003         case POP3_GETSIZE_LIST:
1004                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
1005                 session_recv_data(session, 0, ".\r\n");
1006                 break;
1007         case POP3_RETR:
1008                 pop3_session->state = POP3_RETR_RECV;
1009                 session_recv_data(session, 0, ".\r\n");
1010                 break;
1011         case POP3_TOP:
1012                 if (val == PS_NOTSUPPORTED) {
1013                         pop3_session->error_val = PS_SUCCESS;
1014                 } else {
1015                         pop3_session->state = POP3_TOP_RECV;
1016                         session_recv_data(session, 0, ".\r\n");
1017                 }
1018                 break;
1019         case POP3_DELETE:
1020                 pop3_delete_recv(pop3_session);
1021                 if (pop3_session->cur_msg == pop3_session->count)
1022                         val = pop3_logout_send(pop3_session);
1023                 else {
1024                         pop3_session->cur_msg++;
1025                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1026                                 return -1;
1027                 }
1028                 break;
1029         case POP3_LOGOUT:
1030                 pop3_session->state = POP3_DONE;
1031                 session_disconnect(session);
1032                 break;
1033         case POP3_ERROR:
1034         default:
1035                 return -1;
1036         }
1037
1038         return val == PS_SUCCESS?0:-1;
1039 }
1040
1041 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
1042                                             guint len)
1043 {
1044         Pop3Session *pop3_session = POP3_SESSION(session);
1045         Pop3ErrorValue val = PS_SUCCESS;
1046
1047         switch (pop3_session->state) {
1048         case POP3_GETRANGE_UIDL_RECV:
1049                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
1050                 if (val == PS_SUCCESS) {
1051                         if (pop3_session->new_msg_exist)
1052                                 pop3_getsize_list_send(pop3_session);
1053                         else
1054                                 pop3_logout_send(pop3_session);
1055                 } else
1056                         return -1;
1057                 break;
1058         case POP3_GETSIZE_LIST_RECV:
1059                 val = pop3_getsize_list_recv(pop3_session, data, len);
1060                 if (val == PS_SUCCESS) {
1061                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1062                                 return -1;
1063                 } else
1064                         return -1;
1065                 break;
1066         case POP3_RETR_RECV:
1067                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1068                         return -1;
1069
1070                 if (pop3_session->ac_prefs->rmmail &&
1071                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1072                     pop3_session->msg[pop3_session->cur_msg].recv_time
1073                     != RECV_TIME_KEEP)
1074                         pop3_delete_send(pop3_session);
1075                 else if (pop3_session->cur_msg == pop3_session->count)
1076                         pop3_logout_send(pop3_session);
1077                 else {
1078                         pop3_session->cur_msg++;
1079                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1080                                 return -1;
1081                 }
1082                 break;
1083         case POP3_TOP_RECV:
1084                 if (pop3_top_recv(pop3_session, data, len) < 0)
1085                         return -1;
1086
1087                 if (pop3_session->cur_msg == pop3_session->count)
1088                         pop3_logout_send(pop3_session);
1089                 else {
1090                         pop3_session->cur_msg++;
1091                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1092                                 return -1;
1093                 }
1094                 break;
1095         case POP3_TOP:
1096                 log_warning(LOG_PROTOCOL, _("TOP command unsupported\n"));
1097                 if (pop3_session->cur_msg == pop3_session->count)
1098                         pop3_logout_send(pop3_session);
1099                 else {
1100                         pop3_session->cur_msg++;
1101                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1102                                 return -1;
1103                 }
1104                 break;
1105         case POP3_ERROR:
1106         default:
1107                 return -1;
1108         }
1109
1110         return 0;
1111 }