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_error(_("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_error(_("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_error(_("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                 || partial_recv != POP3_TOTALLY_RECEIVED) {
 271                         session->msg[num].received =
 272                                 (partial_recv != POP3_MUST_COMPLETE_RECV);
 273                         session->msg[num].partial_recv = partial_recv;
 274
 275                 }
 276                 if (!session->new_msg_exist &&
 277                     (session->ac_prefs->getall || recv_time == RECV_TIME_NONE ||
 278                      session->ac_prefs->rmmail)) {
 279                         session->cur_msg = num;
 280                         session->new_msg_exist = TRUE;
 281                 }
 282         }
 283
 284         session->uidl_is_valid = TRUE;
 285         return PS_SUCCESS;
 286 }
 287
 288 static gint pop3_getsize_list_send(Pop3Session *session)
 289 {
 290         session->state = POP3_GETSIZE_LIST;
 291         pop3_gen_send(session, "LIST");
 292         return PS_SUCCESS;
 293 }
 294
 295 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 296                                    guint len)
 297 {
 298         gchar buf[POPBUFSIZE];
 299         gint buf_len;
 300         guint num, size;
 301         const gchar *p = data;
 302         const gchar *lastp = data + len;
 303         const gchar *newline;
 304
 305         while (p < lastp) {
 306                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 307                         return -1;
 308                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 309                 memcpy(buf, p, buf_len);
 310                 buf[buf_len] = '\0';
 311
 312                 p = newline + 1;
 313                 if (p < lastp && *p == '\n') p++;
 314
 315                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 316                         session->error_val = PS_PROTOCOL;
 317                         return -1;
 318                 }
 319
 320                 if (num > 0 && num <= session->count)
 321                         session->msg[num].size = size;
 322                 if (num > 0 && num < session->cur_msg)
 323                         session->cur_total_bytes += size;
 324         }
 325
 326         return PS_SUCCESS;
 327 }
 328
 329 static gint pop3_retr_send(Pop3Session *session)
 330 {
 331         session->state = POP3_RETR;
 332         pop3_gen_send(session, "RETR %d", session->cur_msg);
 333         return PS_SUCCESS;
 334 }
 335
 336 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 337 {
 338         gchar *file;
 339         gint drop_ok;
 340         MailReceiveData mail_receive_data;
 341
 342         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 343          * because some plugins may think that it has a C string. */
 344         mail_receive_data.session  = session;
 345         mail_receive_data.data     = g_new0(gchar, len + 1);
 346         mail_receive_data.data_len = len;
 347         memcpy(mail_receive_data.data, data, len);
 348
 349         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 350
 351         file = get_tmp_file();
 352         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 353                                    mail_receive_data.data_len, NULL) < 0) {
 354                 g_free(file);
 355                 g_free(mail_receive_data.data);
 356                 session->error_val = PS_IOERR;
 357                 return -1;
 358         }
 359         g_free(mail_receive_data.data);
 360
 361         if (session->msg[session->cur_msg].partial_recv
 362             == POP3_MUST_COMPLETE_RECV) {
 363                 gchar *old_file = partial_get_filename(
 364                                 session->ac_prefs->recv_server,
 365                                 session->ac_prefs->userid,
 366                                 session->msg[session->cur_msg].uidl);
 367
 368                 if (old_file) {
 369                         partial_delete_old(old_file);
 370                         g_free(old_file);
 371                 }
 372         }
 373
 374         /* drop_ok: 0: success 1: don't receive -1: error */
 375         drop_ok = session->drop_message(session, file);
 376
 377         g_free(file);
 378         if (drop_ok < 0) {
 379                 session->error_val = PS_IOERR;
 380                 return -1;
 381         }
 382
 383         session->cur_total_bytes += session->msg[session->cur_msg].size;
 384         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 385         session->cur_total_num++;
 386
 387         session->msg[session->cur_msg].received = TRUE;
 388         session->msg[session->cur_msg].partial_recv = POP3_TOTALLY_RECEIVED;
 389
 390         session->msg[session->cur_msg].recv_time =
 391                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 392
 393         return PS_SUCCESS;
 394 }
 395
 396 static gint pop3_top_send(Pop3Session *session, gint max_size)
 397 {
 398         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 399         session->state = POP3_TOP;
 400         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 401         return PS_SUCCESS;
 402 }
 403
 404 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 405 {
 406         gchar *file;
 407         gint drop_ok;
 408         MailReceiveData mail_receive_data;
 409         gchar *partial_notice = NULL;
 410
 411         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 412          * because some plugins may think that it has a C string. */
 413         mail_receive_data.session  = session;
 414         mail_receive_data.data     = g_new0(gchar, len + 1);
 415         mail_receive_data.data_len = len;
 416         memcpy(mail_receive_data.data, data, len);
 417
 418         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 419
 420         partial_notice = g_strdup_printf("SC-Marked-For-Download: 0\n"
 421                                          "SC-Partially-Retrieved: %s\n"
 422                                          "SC-Account-Server: %s\n"
 423                                          "SC-Account-Login: %s\n"
 424                                          "SC-Message-Size: %d",
 425                                          session->msg[session->cur_msg].uidl,
 426                                          session->ac_prefs->recv_server,
 427                                          session->ac_prefs->userid,
 428                                          session->msg[session->cur_msg].size);
 429         file = get_tmp_file();
 430         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 431                                    mail_receive_data.data_len,
 432                                    partial_notice) < 0) {
 433                 g_free(file);
 434                 g_free(mail_receive_data.data);
 435                 session->error_val = PS_IOERR;
 436                 g_free(partial_notice);
 437                 return -1;
 438         }
 439         g_free(mail_receive_data.data);
 440         g_free(partial_notice);
 441
 442         /* drop_ok: 0: success 1: don't receive -1: error */
 443         drop_ok = session->drop_message(session, file);
 444         g_free(file);
 445         if (drop_ok < 0) {
 446                 session->error_val = PS_IOERR;
 447                 return -1;
 448         }
 449
 450         session->cur_total_bytes += session->msg[session->cur_msg].size;
 451         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 452         session->cur_total_num++;
 453
 454         session->msg[session->cur_msg].received = TRUE;
 455         session->msg[session->cur_msg].partial_recv = POP3_PARTIALLY_RECEIVED;
 456         session->msg[session->cur_msg].recv_time =
 457                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 458
 459         return PS_SUCCESS;
 460 }
 461
 462 static gint pop3_delete_send(Pop3Session *session)
 463 {
 464         session->state = POP3_DELETE;
 465         pop3_gen_send(session, "DELE %d", session->cur_msg);
 466         return PS_SUCCESS;
 467 }
 468
 469 static gint pop3_delete_recv(Pop3Session *session)
 470 {
 471         session->msg[session->cur_msg].deleted = TRUE;
 472         return PS_SUCCESS;
 473 }
 474
 475 static gint pop3_logout_send(Pop3Session *session)
 476 {
 477         session->state = POP3_LOGOUT;
 478         pop3_gen_send(session, "QUIT");
 479         return PS_SUCCESS;
 480 }
 481
 482 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 483 {
 484         gchar buf[POPBUFSIZE + 1];
 485         va_list args;
 486
 487         va_start(args, format);
 488         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 489         va_end(args);
 490
 491         if (!g_ascii_strncasecmp(buf, "PASS ", 5))
 492                 log_print("POP3> PASS ********\n");
 493         else
 494                 log_print("POP3> %s\n", buf);
 495
 496         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 497 }
 498
 499 Session *pop3_session_new(PrefsAccount *account)
 500 {
 501         Pop3Session *session;
 502
 503         g_return_val_if_fail(account != NULL, NULL);
 504
 505         session = g_new0(Pop3Session, 1);
 506
 507         session_init(SESSION(session));
 508
 509         SESSION(session)->type = SESSION_POP3;
 510
 511         SESSION(session)->recv_msg = pop3_session_recv_msg;
 512         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 513         SESSION(session)->send_data_finished = NULL;
 514
 515         SESSION(session)->destroy = pop3_session_destroy;
 516
 517         session->state = POP3_READY;
 518         session->ac_prefs = account;
 519         session->pop_before_smtp = FALSE;
 520         pop3_get_uidl_table(account, session);
 521         session->current_time = time(NULL);
 522         session->error_val = PS_SUCCESS;
 523         session->error_msg = NULL;
 524
 525         return SESSION(session);
 526 }
 527
 528 static void pop3_session_destroy(Session *session)
 529 {
 530         Pop3Session *pop3_session = POP3_SESSION(session);
 531         gint n;
 532
 533         g_return_if_fail(session != NULL);
 534
 535         for (n = 1; n <= pop3_session->count; n++)
 536                 g_free(pop3_session->msg[n].uidl);
 537         g_free(pop3_session->msg);
 538
 539         if (pop3_session->uidl_table) {
 540                 hash_free_strings(pop3_session->uidl_table);
 541                 g_hash_table_destroy(pop3_session->uidl_table);
 542         }
 543
 544         if (pop3_session->partial_recv_table) {
 545                 hash_free_strings(pop3_session->partial_recv_table);
 546                 g_hash_table_destroy(pop3_session->partial_recv_table);
 547         }
 548
 549         g_free(pop3_session->greeting);
 550         g_free(pop3_session->user);
 551         g_free(pop3_session->pass);
 552         g_free(pop3_session->error_msg);
 553 }
 554
 555 void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session)
 556 {
 557         GHashTable *table;
 558         GHashTable *partial_recv_table;
 559         gchar *path;
 560         FILE *fp;
 561         gchar buf[POPBUFSIZE];
 562         gchar uidl[POPBUFSIZE];
 563         time_t recv_time;
 564         time_t now;
 565         gint partial_recv;
 566
 567         table = g_hash_table_new(g_str_hash, g_str_equal);
 568         partial_recv_table = g_hash_table_new(g_str_hash, g_str_equal);
 569
 570         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 571                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 572                            "-", ac_prefs->userid, NULL);
 573         if ((fp = fopen(path, "rb")) == NULL) {
 574                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 575                 g_free(path);
 576                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 577                                    "uidl-", ac_prefs->recv_server,
 578                                    "-", ac_prefs->userid, NULL);
 579                 if ((fp = fopen(path, "rb")) == NULL) {
 580                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 581                         g_free(path);
 582                         session->uidl_table = table;
 583                         session->partial_recv_table = partial_recv_table;
 584                         return;
 585                 }
 586         }
 587         g_free(path);
 588
 589         now = time(NULL);
 590
 591         while (fgets(buf, sizeof(buf), fp) != NULL) {
 592                 gchar tmp[POPBUFSIZE];
 593                 strretchomp(buf);
 594                 recv_time = RECV_TIME_NONE;
 595                 partial_recv = POP3_TOTALLY_RECEIVED;
 596
 597                 if (sscanf(buf, "%s\t%ld\t%s", uidl, &recv_time, tmp) < 3) {
 598                         if (sscanf(buf, "%s\t%ld", uidl, &recv_time) != 2) {
 599                                 if (sscanf(buf, "%s", uidl) != 1)
 600                                         continue;
 601                                 else {
 602                                         recv_time = now;
 603                                         strcpy(tmp, "0");
 604                                 }
 605                         } else {
 606                                 strcpy(tmp, "0");
 607                         }
 608                 }
 609
 610                 if (recv_time == RECV_TIME_NONE)
 611                         recv_time = RECV_TIME_RECEIVED;
 612                 g_hash_table_insert(table, g_strdup(uidl),
 613                                     GINT_TO_POINTER(recv_time));
 614                 if (strlen(tmp) == 1)
 615                         partial_recv = atoi(tmp); /* totally received ?*/
 616                 else
 617                         partial_recv = POP3_MUST_COMPLETE_RECV;
 618
 619                 g_hash_table_insert(partial_recv_table, g_strdup(uidl),
 620                                     GINT_TO_POINTER(partial_recv));
 621         }
 622
 623         fclose(fp);
 624         session->uidl_table = table;
 625         session->partial_recv_table = partial_recv_table;
 626
 627         return;
 628 }
 629
 630 gint pop3_write_uidl_list(Pop3Session *session)
 631 {
 632         gchar *path;
 633         FILE *fp;
 634         Pop3MsgInfo *msg;
 635         gint n;
 636
 637         if (!session->uidl_is_valid) return 0;
 638
 639         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 640                            "uidl", G_DIR_SEPARATOR_S,
 641                            session->ac_prefs->recv_server,
 642                            "-", session->ac_prefs->userid, NULL);
 643         if ((fp = fopen(path, "wb")) == NULL) {
 644                 FILE_OP_ERROR(path, "fopen");
 645                 g_free(path);
 646                 return -1;
 647         }
 648
 649         for (n = 1; n <= session->count; n++) {
 650                 msg = &session->msg[n];
 651                 if (msg->uidl && msg->received &&
 652                     (!msg->deleted || session->state != POP3_DONE))
 653                         fprintf(fp, "%s\t%ld\t%d\n",
 654                                 msg->uidl, msg->recv_time, msg->partial_recv);
 655         }
 656
 657         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 658         g_free(path);
 659
 660         return 0;
 661 }
 662
 663 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 664                                    guint len, const gchar *prefix)
 665 {
 666         FILE *fp;
 667         const gchar *prev, *cur;
 668
 669         g_return_val_if_fail(file != NULL, -1);
 670
 671         if ((fp = fopen(file, "wb")) == NULL) {
 672                 FILE_OP_ERROR(file, "fopen");
 673                 return -1;
 674         }
 675
 676         if (change_file_mode_rw(fp, file) < 0)
 677                 FILE_OP_ERROR(file, "chmod");
 678
 679         if (prefix != NULL) {
 680                 fprintf(fp, "%s", prefix);
 681                 fprintf(fp, "\n");
 682         }
 683
 684         /* +------------------+----------------+--------------------------+ *
 685          * ^data              ^prev            ^cur             data+len-1^ */
 686
 687         prev = data;
 688         while ((cur = (gchar *)my_memmem(prev, len - (prev - data), "\r\n", 2))
 689                != NULL) {
 690                 if ((cur > prev && fwrite(prev, cur - prev, 1, fp) < 1) ||
 691                     fputc('\n', fp) == EOF) {
 692                         FILE_OP_ERROR(file, "fwrite");
 693                         g_warning("can't write to file: %s\n", file);
 694                         fclose(fp);
 695                         unlink(file);
 696                         return -1;
 697                 }
 698
 699                 if (cur == data + len - 1) {
 700                         prev = cur + 1;
 701                         break;
 702                 }
 703
 704                 if (*(cur + 1) == '\n')
 705                         prev = cur + 2;
 706                 else
 707                         prev = cur + 1;
 708
 709                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 710                         prev++;
 711
 712                 if (prev - data >= len)
 713                         break;
 714         }
 715
 716         if (prev - data < len &&
 717             fwrite(prev, len - (prev - data), 1, fp) < 1) {
 718                 FILE_OP_ERROR(file, "fwrite");
 719                 g_warning("can't write to file: %s\n", file);
 720                 fclose(fp);
 721                 unlink(file);
 722                 return -1;
 723         }
 724         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 725                 if (fputc('\n', fp) == EOF) {
 726                         FILE_OP_ERROR(file, "fputc");
 727                         g_warning("can't write to file: %s\n", file);
 728                         fclose(fp);
 729                         unlink(file);
 730                         return -1;
 731                 }
 732         }
 733
 734         if (fclose(fp) == EOF) {
 735                 FILE_OP_ERROR(file, "fclose");
 736                 unlink(file);
 737                 return -1;
 738         }
 739
 740         return 0;
 741 }
 742
 743 static Pop3State pop3_lookup_next(Pop3Session *session)
 744 {
 745         Pop3MsgInfo *msg;
 746         PrefsAccount *ac = session->ac_prefs;
 747         gint size;
 748         gboolean size_limit_over;
 749
 750         for (;;) {
 751                 msg = &session->msg[session->cur_msg];
 752                 size = msg->size;
 753                 size_limit_over =
 754                     (ac->enable_size_limit &&
 755                      ac->size_limit > 0 &&
 756                      size > ac->size_limit * 1024);
 757
 758                 if (ac->rmmail &&
 759                     msg->recv_time != RECV_TIME_NONE &&
 760                     msg->recv_time != RECV_TIME_KEEP &&
 761                     msg->partial_recv == POP3_TOTALLY_RECEIVED &&
 762                     session->current_time - msg->recv_time >=
 763                     ac->msg_leave_time * 24 * 60 * 60) {
 764                         log_message
 765                                 (_("POP3: Deleting expired message "
 766                                    "%d\n"), session->cur_msg);
 767                         pop3_delete_send(session);
 768                         return POP3_DELETE;
 769                 }
 770
 771                 if (size_limit_over) {
 772                         if (!msg->received && msg->partial_recv !=
 773                             POP3_MUST_COMPLETE_RECV) {
 774                                 pop3_top_send(session, ac->size_limit);
 775                                 return POP3_TOP;
 776                         } else if (msg->partial_recv == POP3_MUST_COMPLETE_RECV)
 777                                 break;
 778
 779                         log_message
 780                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 781                                    session->cur_msg, size);
 782                 }
 783
 784                 if (size == 0 || msg->received || size_limit_over) {
 785                         session->cur_total_bytes += size;
 786                         if (session->cur_msg == session->count) {
 787                                 pop3_logout_send(session);
 788                                 return POP3_LOGOUT;
 789                         } else
 790                                 session->cur_msg++;
 791                 } else
 792                         break;
 793         }
 794
 795         pop3_retr_send(session);
 796         return POP3_RETR;
 797 }
 798
 799 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 800 {
 801         Pop3ErrorValue ok;
 802
 803         log_print("POP3< %s\n", msg);
 804
 805         if (!strncmp(msg, "+OK", 3))
 806                 ok = PS_SUCCESS;
 807         else if (!strncmp(msg, "-ERR", 4)) {
 808                 if (strstr(msg + 4, "lock") ||
 809                     strstr(msg + 4, "Lock") ||
 810                     strstr(msg + 4, "LOCK") ||
 811                     strstr(msg + 4, "wait")) {
 812                         log_error(_("mailbox is locked\n"));
 813                         ok = PS_LOCKBUSY;
 814                 } else if (strcasestr(msg + 4, "timeout")) {
 815                         log_error(_("Session timeout\n"));
 816                         ok = PS_ERROR;
 817                 } else {
 818                         switch (session->state) {
 819 #if USE_OPENSSL
 820                         case POP3_STLS:
 821                                 log_error(_("can't start TLS session\n"));
 822                                 ok = PS_ERROR;
 823                                 break;
 824 #endif
 825                         case POP3_GETAUTH_USER:
 826                         case POP3_GETAUTH_PASS:
 827                         case POP3_GETAUTH_APOP:
 828                                 log_error(_("error occurred on authentication\n"));
 829                                 ok = PS_AUTHFAIL;
 830                                 break;
 831                         case POP3_GETRANGE_LAST:
 832                         case POP3_GETRANGE_UIDL:
 833                         case POP3_TOP:
 834                                 log_warning(_("command not supported\n"));
 835                                 ok = PS_NOTSUPPORTED;
 836                                 break;
 837
 838                         default:
 839                                 log_error(_("error occurred on POP3 session\n"));
 840                                 ok = PS_ERROR;
 841                         }
 842                 }
 843
 844                 g_free(session->error_msg);
 845                 session->error_msg = g_strdup(msg);
 846                 fprintf(stderr, "POP3: %s\n", msg);
 847         } else
 848                 ok = PS_PROTOCOL;
 849
 850         session->error_val = ok;
 851         return ok;
 852 }
 853
 854 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 855 {
 856         Pop3Session *pop3_session = POP3_SESSION(session);
 857         Pop3ErrorValue val = PS_SUCCESS;
 858         const guchar *body;
 859
 860         body = msg;
 861         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 862             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 863                 val = pop3_ok(pop3_session, msg);
 864                 if (val != PS_SUCCESS) {
 865                         if (val != PS_NOTSUPPORTED) {
 866                                 pop3_session->state = POP3_ERROR;
 867                                 return -1;
 868                         }
 869                 }
 870
 871                 if (*body == '+' || *body == '-')
 872                         body++;
 873                 while (isalpha(*body))
 874                         body++;
 875                 while (isspace(*body))
 876                         body++;
 877         }
 878
 879         switch (pop3_session->state) {
 880         case POP3_READY:
 881         case POP3_GREETING:
 882                 pop3_greeting_recv(pop3_session, body);
 883 #if USE_OPENSSL
 884                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 885                         pop3_stls_send(pop3_session);
 886                 else
 887 #endif
 888                 if (pop3_session->ac_prefs->use_apop_auth)
 889                         pop3_getauth_apop_send(pop3_session);
 890                 else
 891                         pop3_getauth_user_send(pop3_session);
 892                 break;
 893 #if USE_OPENSSL
 894         case POP3_STLS:
 895                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 896                         return -1;
 897                 if (pop3_session->ac_prefs->use_apop_auth)
 898                         pop3_getauth_apop_send(pop3_session);
 899                 else
 900                         pop3_getauth_user_send(pop3_session);
 901                 break;
 902 #endif
 903         case POP3_GETAUTH_USER:
 904                 pop3_getauth_pass_send(pop3_session);
 905                 break;
 906         case POP3_GETAUTH_PASS:
 907         case POP3_GETAUTH_APOP:
 908                 if (!pop3_session->pop_before_smtp)
 909                         pop3_getrange_stat_send(pop3_session);
 910                 else
 911                         pop3_logout_send(pop3_session);
 912                 break;
 913         case POP3_GETRANGE_STAT:
 914                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 915                         return -1;
 916                 if (pop3_session->count > 0)
 917                         pop3_getrange_uidl_send(pop3_session);
 918                 else
 919                         pop3_logout_send(pop3_session);
 920                 break;
 921         case POP3_GETRANGE_LAST:
 922                 if (val == PS_NOTSUPPORTED)
 923                         pop3_session->error_val = PS_SUCCESS;
 924                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 925                         return -1;
 926                 if (pop3_session->cur_msg > 0)
 927                         pop3_getsize_list_send(pop3_session);
 928                 else
 929                         pop3_logout_send(pop3_session);
 930                 break;
 931         case POP3_GETRANGE_UIDL:
 932                 if (val == PS_NOTSUPPORTED) {
 933                         pop3_session->error_val = PS_SUCCESS;
 934                         pop3_getrange_last_send(pop3_session);
 935                 } else {
 936                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
 937                         session_recv_data(session, 0, ".\r\n");
 938                 }
 939                 break;
 940         case POP3_GETSIZE_LIST:
 941                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
 942                 session_recv_data(session, 0, ".\r\n");
 943                 break;
 944         case POP3_RETR:
 945                 pop3_session->state = POP3_RETR_RECV;
 946                 session_recv_data(session, 0, ".\r\n");
 947                 break;
 948         case POP3_TOP:
 949                 if (val == PS_NOTSUPPORTED) {
 950                         pop3_session->error_val = PS_SUCCESS;
 951                 } else {
 952                         pop3_session->state = POP3_TOP_RECV;
 953                         session_recv_data(session, 0, ".\r\n");
 954                 }
 955                 break;
 956         case POP3_DELETE:
 957                 pop3_delete_recv(pop3_session);
 958                 if (pop3_session->cur_msg == pop3_session->count)
 959                         pop3_logout_send(pop3_session);
 960                 else {
 961                         pop3_session->cur_msg++;
 962                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 963                                 return -1;
 964                 }
 965                 break;
 966         case POP3_LOGOUT:
 967                 pop3_session->state = POP3_DONE;
 968                 session_disconnect(session);
 969                 break;
 970         case POP3_ERROR:
 971         default:
 972                 return -1;
 973         }
 974
 975         return 0;
 976 }
 977
 978 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
 979                                             guint len)
 980 {
 981         Pop3Session *pop3_session = POP3_SESSION(session);
 982         Pop3ErrorValue val = PS_SUCCESS;
 983
 984         switch (pop3_session->state) {
 985         case POP3_GETRANGE_UIDL_RECV:
 986                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
 987                 if (val == PS_SUCCESS) {
 988                         if (pop3_session->new_msg_exist)
 989                                 pop3_getsize_list_send(pop3_session);
 990                         else
 991                                 pop3_logout_send(pop3_session);
 992                 } else
 993                         return -1;
 994                 break;
 995         case POP3_GETSIZE_LIST_RECV:
 996                 val = pop3_getsize_list_recv(pop3_session, data, len);
 997                 if (val == PS_SUCCESS) {
 998                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 999                                 return -1;
1000                 } else
1001                         return -1;
1002                 break;
1003         case POP3_RETR_RECV:
1004                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1005                         return -1;
1006
1007                 if (pop3_session->ac_prefs->rmmail &&
1008                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1009                     pop3_session->msg[pop3_session->cur_msg].recv_time
1010                     != RECV_TIME_KEEP)
1011                         pop3_delete_send(pop3_session);
1012                 else if (pop3_session->cur_msg == pop3_session->count)
1013                         pop3_logout_send(pop3_session);
1014                 else {
1015                         pop3_session->cur_msg++;
1016                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1017                                 return -1;
1018                 }
1019                 break;
1020         case POP3_TOP_RECV:
1021                 if (pop3_top_recv(pop3_session, data, len) < 0)
1022                         return -1;
1023
1024                 if (pop3_session->cur_msg == pop3_session->count)
1025                         pop3_logout_send(pop3_session);
1026                 else {
1027                         pop3_session->cur_msg++;
1028                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1029                                 return -1;
1030                 }
1031                 break;
1032         case POP3_TOP:
1033                 log_warning(_("TOP command unsupported\n"));
1034                 if (pop3_session->cur_msg == pop3_session->count)
1035                         pop3_logout_send(pop3_session);
1036                 else {
1037                         pop3_session->cur_msg++;
1038                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1039                                 return -1;
1040                 }
1041                 break;
1042         case POP3_ERROR:
1043         default:
1044                 return -1;
1045         }
1046
1047         return 0;
1048 }