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 #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 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 gint pop3_greeting_recv(Pop3Session *session, const gchar *msg)
  95 {
  96         session->state = POP3_GREETING;
  97
  98         session->greeting = g_strdup(msg);
  99         return PS_SUCCESS;
 100 }
 101
 102 #if USE_OPENSSL
 103 static gint pop3_stls_send(Pop3Session *session)
 104 {
 105         session->state = POP3_STLS;
 106         pop3_gen_send(session, "STLS");
 107         return PS_SUCCESS;
 108 }
 109
 110 static gint pop3_stls_recv(Pop3Session *session)
 111 {
 112         if (session_start_tls(SESSION(session)) < 0) {
 113                 session->error_val = PS_SOCKET;
 114                 return -1;
 115         }
 116         return PS_SUCCESS;
 117 }
 118 #endif /* USE_OPENSSL */
 119
 120 static gint pop3_getauth_user_send(Pop3Session *session)
 121 {
 122         g_return_val_if_fail(session->user != NULL, -1);
 123
 124         session->state = POP3_GETAUTH_USER;
 125         pop3_gen_send(session, "USER %s", session->user);
 126         return PS_SUCCESS;
 127 }
 128
 129 static gint pop3_getauth_pass_send(Pop3Session *session)
 130 {
 131         g_return_val_if_fail(session->pass != NULL, -1);
 132
 133         session->state = POP3_GETAUTH_PASS;
 134         pop3_gen_send(session, "PASS %s", session->pass);
 135         return PS_SUCCESS;
 136 }
 137
 138 static gint pop3_getauth_apop_send(Pop3Session *session)
 139 {
 140         gchar *start, *end;
 141         gchar *apop_str;
 142         gchar md5sum[33];
 143
 144         g_return_val_if_fail(session->user != NULL, -1);
 145         g_return_val_if_fail(session->pass != NULL, -1);
 146
 147         session->state = POP3_GETAUTH_APOP;
 148
 149         if ((start = strchr(session->greeting, '<')) == NULL) {
 150                 log_warning(_("Required APOP timestamp not found "
 151                             "in greeting\n"));
 152                 session->error_val = PS_PROTOCOL;
 153                 return -1;
 154         }
 155
 156         if ((end = strchr(start, '>')) == NULL || end == start + 1) {
 157                 log_warning(_("Timestamp syntax error in greeting\n"));
 158                 session->error_val = PS_PROTOCOL;
 159                 return -1;
 160         }
 161
 162         *(end + 1) = '\0';
 163
 164         apop_str = g_strconcat(start, session->pass, NULL);
 165         md5_hex_digest(md5sum, apop_str);
 166         g_free(apop_str);
 167
 168         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 169
 170         return PS_SUCCESS;
 171 }
 172
 173 static gint pop3_getrange_stat_send(Pop3Session *session)
 174 {
 175         session->state = POP3_GETRANGE_STAT;
 176         pop3_gen_send(session, "STAT");
 177         return PS_SUCCESS;
 178 }
 179
 180 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 181 {
 182         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 183                 log_warning(_("POP3 protocol error\n"));
 184                 session->error_val = PS_PROTOCOL;
 185                 return -1;
 186         } else {
 187                 if (session->count == 0) {
 188                         session->uidl_is_valid = TRUE;
 189                 } else {
 190                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 191                         session->cur_msg = 1;
 192                 }
 193         }
 194
 195         return PS_SUCCESS;
 196 }
 197
 198 static gint pop3_getrange_last_send(Pop3Session *session)
 199 {
 200         session->state = POP3_GETRANGE_LAST;
 201         pop3_gen_send(session, "LAST");
 202         return PS_SUCCESS;
 203 }
 204
 205 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 206 {
 207         gint last;
 208
 209         if (sscanf(msg, "%d", &last) == 0) {
 210                 log_warning(_("POP3 protocol error\n"));
 211                 session->error_val = PS_PROTOCOL;
 212                 return -1;
 213         } else {
 214                 if (session->count > last) {
 215                         session->new_msg_exist = TRUE;
 216                         session->cur_msg = last + 1;
 217                 } else
 218                         session->cur_msg = 0;
 219         }
 220
 221         return PS_SUCCESS;
 222 }
 223
 224 static gint pop3_getrange_uidl_send(Pop3Session *session)
 225 {
 226         session->state = POP3_GETRANGE_UIDL;
 227         pop3_gen_send(session, "UIDL");
 228         return PS_SUCCESS;
 229 }
 230
 231 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *data,
 232                                     guint len)
 233 {
 234         gchar id[IDLEN + 1];
 235         gchar buf[POPBUFSIZE];
 236         gint buf_len;
 237         gint num;
 238         time_t recv_time;
 239         gint partial_recv;
 240         const gchar *p = data;
 241         const gchar *lastp = data + len;
 242         const gchar *newline;
 243
 244         while (p < lastp) {
 245                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 246                         return -1;
 247                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 248                 memcpy(buf, p, buf_len);
 249                 buf[buf_len] = '\0';
 250
 251                 p = newline + 1;
 252                 if (p < lastp && *p == '\n') p++;
 253
 254                 if (sscanf(buf, "%d %" Xstr(IDLEN) "s", &num, id) != 2 ||
 255                     num <= 0 || num > session->count) {
 256                         log_warning(_("invalid UIDL response: %s\n"), buf);
 257                         continue;
 258                 }
 259
 260                 session->msg[num].uidl = g_strdup(id);
 261
 262                 recv_time = (time_t)g_hash_table_lookup(
 263                                         session->uidl_table, id);
 264                 session->msg[num].recv_time = recv_time;
 265
 266                 partial_recv = (gint)g_hash_table_lookup(
 267                                         session->partial_recv_table, id);
 268
 269                 if (!session->ac_prefs->getall && recv_time != RECV_TIME_NONE) {
 270                         session->msg[num].received =
 271                                 (partial_recv != POP3_MUST_COMPLETE_RECV);
 272                         session->msg[num].partial_recv = partial_recv;
 273
 274                 }
 275                 if (!session->new_msg_exist &&
 276                     (session->ac_prefs->getall || recv_time == RECV_TIME_NONE ||
 277                      session->ac_prefs->rmmail)) {
 278                         session->cur_msg = num;
 279                         session->new_msg_exist = TRUE;
 280                 }
 281         }
 282
 283         session->uidl_is_valid = TRUE;
 284         return PS_SUCCESS;
 285 }
 286
 287 static gint pop3_getsize_list_send(Pop3Session *session)
 288 {
 289         session->state = POP3_GETSIZE_LIST;
 290         pop3_gen_send(session, "LIST");
 291         return PS_SUCCESS;
 292 }
 293
 294 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 295                                    guint len)
 296 {
 297         gchar buf[POPBUFSIZE];
 298         gint buf_len;
 299         guint num, size;
 300         const gchar *p = data;
 301         const gchar *lastp = data + len;
 302         const gchar *newline;
 303
 304         while (p < lastp) {
 305                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 306                         return -1;
 307                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 308                 memcpy(buf, p, buf_len);
 309                 buf[buf_len] = '\0';
 310
 311                 p = newline + 1;
 312                 if (p < lastp && *p == '\n') p++;
 313
 314                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 315                         session->error_val = PS_PROTOCOL;
 316                         return -1;
 317                 }
 318
 319                 if (num > 0 && num <= session->count)
 320                         session->msg[num].size = size;
 321                 if (num > 0 && num < session->cur_msg)
 322                         session->cur_total_bytes += size;
 323         }
 324
 325         return PS_SUCCESS;
 326 }
 327
 328 static gint pop3_retr_send(Pop3Session *session)
 329 {
 330         session->state = POP3_RETR;
 331         pop3_gen_send(session, "RETR %d", session->cur_msg);
 332         return PS_SUCCESS;
 333 }
 334
 335 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 336 {
 337         gchar *file;
 338         gint drop_ok;
 339         MailReceiveData mail_receive_data;
 340
 341         mail_receive_data.session = session;
 342         mail_receive_data.data = g_strndup(data, len);
 343         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 344
 345         file = get_tmp_file();
 346         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 347                 strlen(mail_receive_data.data), NULL) < 0) {
 348                 g_free(file);
 349                 g_free(mail_receive_data.data);
 350                 session->error_val = PS_IOERR;
 351                 return -1;
 352         }
 353         g_free(mail_receive_data.data);
 354
 355         if (session->msg[session->cur_msg].partial_recv
 356             == POP3_MUST_COMPLETE_RECV) {
 357                 gchar *old_file = partial_get_filename(
 358                                 session->ac_prefs->recv_server,
 359                                 session->ac_prefs->userid,
 360                                 session->msg[session->cur_msg].uidl);
 361
 362                 if (old_file) {
 363                         partial_delete_old(old_file);
 364                         g_free(old_file);
 365                 }
 366         }
 367
 368         /* drop_ok: 0: success 1: don't receive -1: error */
 369         drop_ok = session->drop_message(session, file);
 370
 371         g_free(file);
 372         if (drop_ok < 0) {
 373                 session->error_val = PS_IOERR;
 374                 return -1;
 375         }
 376
 377         session->cur_total_bytes += session->msg[session->cur_msg].size;
 378         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 379         session->cur_total_num++;
 380
 381         session->msg[session->cur_msg].received = TRUE;
 382         session->msg[session->cur_msg].partial_recv = POP3_TOTALLY_RECEIVED;
 383
 384         session->msg[session->cur_msg].recv_time =
 385                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 386
 387         return PS_SUCCESS;
 388 }
 389
 390 static gint pop3_top_send(Pop3Session *session, gint max_size)
 391 {
 392         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 393         session->state = POP3_TOP;
 394         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 395         return PS_SUCCESS;
 396 }
 397
 398 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 399 {
 400         gchar *file;
 401         gint drop_ok;
 402         MailReceiveData mail_receive_data;
 403         gchar *partial_notice = NULL;
 404
 405         mail_receive_data.session = session;
 406         mail_receive_data.data = g_strndup(data, len);
 407         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 408
 409         partial_notice = g_strdup_printf("SC-Marked-For-Download: 0\n"
 410                                          "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);
 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 = POP3_PARTIALLY_RECEIVED;
 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 = POP3_TOTALLY_RECEIVED;
 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); /* totally received ?*/
 598                 else
 599                         partial_recv = POP3_MUST_COMPLETE_RECV;
 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 gint pop3_write_uidl_list(Pop3Session *session)
 613 {
 614         gchar *path;
 615         FILE *fp;
 616         Pop3MsgInfo *msg;
 617         gint n;
 618
 619         if (!session->uidl_is_valid) return 0;
 620
 621         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 622                            "uidl", G_DIR_SEPARATOR_S,
 623                            session->ac_prefs->recv_server,
 624                            "-", session->ac_prefs->userid, NULL);
 625         if ((fp = fopen(path, "wb")) == NULL) {
 626                 FILE_OP_ERROR(path, "fopen");
 627                 g_free(path);
 628                 return -1;
 629         }
 630
 631         for (n = 1; n <= session->count; n++) {
 632                 msg = &session->msg[n];
 633                 if (msg->uidl && msg->received && !msg->deleted) {
 634                         fprintf(fp, "%s\t%ld\t%d\n",
 635                                 msg->uidl, msg->recv_time, msg->partial_recv);
 636                 }
 637         }
 638
 639         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 640         g_free(path);
 641
 642         return 0;
 643 }
 644
 645 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 646                                    guint len, const gchar *prefix)
 647 {
 648         FILE *fp;
 649         const gchar *prev, *cur;
 650
 651         g_return_val_if_fail(file != NULL, -1);
 652
 653         if ((fp = fopen(file, "wb")) == NULL) {
 654                 FILE_OP_ERROR(file, "fopen");
 655                 return -1;
 656         }
 657
 658         if (change_file_mode_rw(fp, file) < 0)
 659                 FILE_OP_ERROR(file, "chmod");
 660
 661         if (prefix != NULL) {
 662                 fprintf(fp, prefix);
 663                 fprintf(fp, "\n");
 664         }
 665
 666         /* +------------------+----------------+--------------------------+ *
 667          * ^data              ^prev            ^cur             data+len-1^ */
 668
 669         prev = data;
 670         while ((cur = memchr(prev, '\r', len - (prev - data))) != NULL) {
 671                 if ((cur > prev && fwrite(prev, cur - prev, 1, fp) < 1) ||
 672                     fputc('\n', fp) == EOF) {
 673                         FILE_OP_ERROR(file, "fwrite");
 674                         g_warning("can't write to file: %s\n", file);
 675                         fclose(fp);
 676                         unlink(file);
 677                         return -1;
 678                 }
 679
 680                 if (cur == data + len - 1) {
 681                         prev = cur + 1;
 682                         break;
 683                 }
 684
 685                 if (*(cur + 1) == '\n')
 686                         prev = cur + 2;
 687                 else
 688                         prev = cur + 1;
 689
 690                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 691                         prev++;
 692
 693                 if (prev - data >= len)
 694                         break;
 695         }
 696
 697         if (prev - data < len &&
 698             fwrite(prev, len - (prev - data), 1, fp) < 1) {
 699                 FILE_OP_ERROR(file, "fwrite");
 700                 g_warning("can't write to file: %s\n", file);
 701                 fclose(fp);
 702                 unlink(file);
 703                 return -1;
 704         }
 705         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 706                 if (fputc('\n', fp) == EOF) {
 707                         FILE_OP_ERROR(file, "fputc");
 708                         g_warning("can't write to file: %s\n", file);
 709                         fclose(fp);
 710                         unlink(file);
 711                         return -1;
 712                 }
 713         }
 714
 715         if (fclose(fp) == EOF) {
 716                 FILE_OP_ERROR(file, "fclose");
 717                 unlink(file);
 718                 return -1;
 719         }
 720
 721         return 0;
 722 }
 723
 724 static Pop3State pop3_lookup_next(Pop3Session *session)
 725 {
 726         Pop3MsgInfo *msg;
 727         PrefsAccount *ac = session->ac_prefs;
 728         gint size;
 729         gboolean size_limit_over;
 730
 731         for (;;) {
 732                 msg = &session->msg[session->cur_msg];
 733                 size = msg->size;
 734                 size_limit_over =
 735                     (ac->enable_size_limit &&
 736                      ac->size_limit > 0 &&
 737                      size > ac->size_limit * 1024);
 738
 739                 if (ac->rmmail &&
 740                     msg->recv_time != RECV_TIME_NONE &&
 741                     msg->recv_time != RECV_TIME_KEEP &&
 742                     msg->partial_recv == POP3_TOTALLY_RECEIVED &&
 743                     session->current_time - msg->recv_time >=
 744                     ac->msg_leave_time * 24 * 60 * 60) {
 745                         log_message
 746                                 (_("POP3: Deleting expired message "
 747                                    "%d\n"), session->cur_msg);
 748                         pop3_delete_send(session);
 749                         return POP3_DELETE;
 750                 }
 751
 752                 if (size_limit_over) {
 753                         if (!msg->received && msg->partial_recv !=
 754                             POP3_MUST_COMPLETE_RECV) {
 755                                 pop3_top_send(session, ac->size_limit);
 756                                 return POP3_TOP;
 757                         } else if (msg->partial_recv == POP3_MUST_COMPLETE_RECV)
 758                                 break;
 759
 760                         log_message
 761                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 762                                    session->cur_msg, size);
 763                 }
 764
 765                 if (size == 0 || msg->received || size_limit_over) {
 766                         session->cur_total_bytes += size;
 767                         if (session->cur_msg == session->count) {
 768                                 pop3_logout_send(session);
 769                                 return POP3_LOGOUT;
 770                         } else
 771                                 session->cur_msg++;
 772                 } else
 773                         break;
 774         }
 775
 776         pop3_retr_send(session);
 777         return POP3_RETR;
 778 }
 779
 780 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 781 {
 782         Pop3ErrorValue ok;
 783
 784         log_print("POP3< %s\n", msg);
 785
 786         if (!strncmp(msg, "+OK", 3))
 787                 ok = PS_SUCCESS;
 788         else if (!strncmp(msg, "-ERR", 4)) {
 789                 if (strstr(msg + 4, "lock") ||
 790                     strstr(msg + 4, "Lock") ||
 791                     strstr(msg + 4, "LOCK") ||
 792                     strstr(msg + 4, "wait")) {
 793                         log_warning(_("mailbox is locked\n"));
 794                         ok = PS_LOCKBUSY;
 795                 } else if (strcasestr(msg + 4, "timeout")) {
 796                         log_warning(_("session timeout\n"));
 797                         ok = PS_ERROR;
 798                 } else {
 799                         switch (session->state) {
 800 #if USE_OPENSSL
 801                         case POP3_STLS:
 802                                 log_warning(_("can't start TLS session\n"));
 803                                 ok = PS_ERROR;
 804                                 break;
 805 #endif
 806                         case POP3_GETAUTH_USER:
 807                         case POP3_GETAUTH_PASS:
 808                         case POP3_GETAUTH_APOP:
 809                                 log_warning(_("error occurred on authentication\n"));
 810                                 ok = PS_AUTHFAIL;
 811                                 break;
 812                         case POP3_GETRANGE_LAST:
 813                         case POP3_GETRANGE_UIDL:
 814                         case POP3_TOP:
 815                                 log_warning(_("command not supported\n"));
 816                                 ok = PS_NOTSUPPORTED;
 817                                 break;
 818
 819                         default:
 820                                 log_warning(_("error occurred on POP3 session\n"));
 821                                 ok = PS_ERROR;
 822                         }
 823                 }
 824
 825                 g_free(session->error_msg);
 826                 session->error_msg = g_strdup(msg);
 827                 fprintf(stderr, "POP3: %s\n", msg);
 828         } else
 829                 ok = PS_PROTOCOL;
 830
 831         session->error_val = ok;
 832         return ok;
 833 }
 834
 835 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 836 {
 837         Pop3Session *pop3_session = POP3_SESSION(session);
 838         Pop3ErrorValue val = PS_SUCCESS;
 839         const guchar *body;
 840
 841         body = msg;
 842         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 843             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 844                 val = pop3_ok(pop3_session, msg);
 845                 if (val != PS_SUCCESS) {
 846                         if (val != PS_NOTSUPPORTED) {
 847                                 pop3_session->state = POP3_ERROR;
 848                                 return -1;
 849                         }
 850                 }
 851
 852                 if (*body == '+' || *body == '-')
 853                         body++;
 854                 while (isalpha(*body))
 855                         body++;
 856                 while (isspace(*body))
 857                         body++;
 858         }
 859
 860         switch (pop3_session->state) {
 861         case POP3_READY:
 862         case POP3_GREETING:
 863                 pop3_greeting_recv(pop3_session, body);
 864 #if USE_OPENSSL
 865                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 866                         pop3_stls_send(pop3_session);
 867                 else
 868 #endif
 869                 if (pop3_session->ac_prefs->protocol == A_APOP)
 870                         pop3_getauth_apop_send(pop3_session);
 871                 else
 872                         pop3_getauth_user_send(pop3_session);
 873                 break;
 874 #if USE_OPENSSL
 875         case POP3_STLS:
 876                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 877                         return -1;
 878                 if (pop3_session->ac_prefs->protocol == A_APOP)
 879                         pop3_getauth_apop_send(pop3_session);
 880                 else
 881                         pop3_getauth_user_send(pop3_session);
 882                 break;
 883 #endif
 884         case POP3_GETAUTH_USER:
 885                 pop3_getauth_pass_send(pop3_session);
 886                 break;
 887         case POP3_GETAUTH_PASS:
 888         case POP3_GETAUTH_APOP:
 889                 if (!pop3_session->pop_before_smtp)
 890                         pop3_getrange_stat_send(pop3_session);
 891                 else
 892                         pop3_logout_send(pop3_session);
 893                 break;
 894         case POP3_GETRANGE_STAT:
 895                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 896                         return -1;
 897                 if (pop3_session->count > 0)
 898                         pop3_getrange_uidl_send(pop3_session);
 899                 else
 900                         pop3_logout_send(pop3_session);
 901                 break;
 902         case POP3_GETRANGE_LAST:
 903                 if (val == PS_NOTSUPPORTED)
 904                         pop3_session->error_val = PS_SUCCESS;
 905                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 906                         return -1;
 907                 if (pop3_session->cur_msg > 0)
 908                         pop3_getsize_list_send(pop3_session);
 909                 else
 910                         pop3_logout_send(pop3_session);
 911                 break;
 912         case POP3_GETRANGE_UIDL:
 913                 if (val == PS_NOTSUPPORTED) {
 914                         pop3_session->error_val = PS_SUCCESS;
 915                         pop3_getrange_last_send(pop3_session);
 916                 } else {
 917                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
 918                         session_recv_data(session, 0, ".\r\n");
 919                 }
 920                 break;
 921         case POP3_GETSIZE_LIST:
 922                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
 923                 session_recv_data(session, 0, ".\r\n");
 924                 break;
 925         case POP3_RETR:
 926                 pop3_session->state = POP3_RETR_RECV;
 927                 session_recv_data(session, 0, ".\r\n");
 928                 break;
 929         case POP3_TOP:
 930                 if (val == PS_NOTSUPPORTED) {
 931                         pop3_session->error_val = PS_SUCCESS;
 932                 } else {
 933                         pop3_session->state = POP3_TOP_RECV;
 934                         session_recv_data(session, 0, ".\r\n");
 935                 }
 936                 break;
 937         case POP3_DELETE:
 938                 pop3_delete_recv(pop3_session);
 939                 if (pop3_session->cur_msg == pop3_session->count)
 940                         pop3_logout_send(pop3_session);
 941                 else {
 942                         pop3_session->cur_msg++;
 943                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 944                                 return -1;
 945                 }
 946                 break;
 947         case POP3_LOGOUT:
 948                 session_disconnect(session);
 949                 break;
 950         case POP3_ERROR:
 951         default:
 952                 return -1;
 953         }
 954
 955         return 0;
 956 }
 957
 958 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
 959                                             guint len)
 960 {
 961         Pop3Session *pop3_session = POP3_SESSION(session);
 962         Pop3ErrorValue val = PS_SUCCESS;
 963
 964         switch (pop3_session->state) {
 965         case POP3_GETRANGE_UIDL_RECV:
 966                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
 967                 if (val == PS_SUCCESS) {
 968                         if (pop3_session->new_msg_exist)
 969                                 pop3_getsize_list_send(pop3_session);
 970                         else
 971                                 pop3_logout_send(pop3_session);
 972                 } else
 973                         return -1;
 974                 break;
 975         case POP3_GETSIZE_LIST_RECV:
 976                 val = pop3_getsize_list_recv(pop3_session, data, len);
 977                 if (val == PS_SUCCESS) {
 978                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 979                                 return -1;
 980                 } else
 981                         return -1;
 982                 break;
 983         case POP3_RETR_RECV:
 984                 if (pop3_retr_recv(pop3_session, data, len) < 0)
 985                         return -1;
 986
 987                 if (pop3_session->ac_prefs->rmmail &&
 988                     pop3_session->ac_prefs->msg_leave_time == 0 &&
 989                     pop3_session->msg[pop3_session->cur_msg].recv_time
 990                     != RECV_TIME_KEEP)
 991                         pop3_delete_send(pop3_session);
 992                 else if (pop3_session->cur_msg == pop3_session->count)
 993                         pop3_logout_send(pop3_session);
 994                 else {
 995                         pop3_session->cur_msg++;
 996                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 997                                 return -1;
 998                 }
 999                 break;
1000         case POP3_TOP_RECV:
1001                 if (pop3_top_recv(pop3_session, data, len) < 0)
1002                         return -1;
1003
1004                 if (pop3_session->cur_msg == pop3_session->count)
1005                         pop3_logout_send(pop3_session);
1006                 else {
1007                         pop3_session->cur_msg++;
1008                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1009                                 return -1;
1010                 }
1011                 break;
1012         case POP3_TOP:
1013                 log_warning(_("TOP command unsupported\n"));
1014                 if (pop3_session->cur_msg == pop3_session->count)
1015                         pop3_logout_send(pop3_session);
1016                 else {
1017                         pop3_session->cur_msg++;
1018                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1019                                 return -1;
1020                 }
1021                 break;
1022         case POP3_ERROR:
1023         default:
1024                 return -1;
1025         }
1026
1027         return 0;
1028 }