src/pop.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2003 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 "inc.h"
  39 #include "recv.h"
  40
  41 #include "log.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 *msg);
  61 static gint pop3_getsize_list_send      (Pop3Session *session);
  62 static gint pop3_getsize_list_recv      (Pop3Session *session,
  63                                          const gchar *msg);
  64 static gint pop3_retr_send              (Pop3Session *session);
  65 static gint pop3_retr_recv              (Pop3Session *session,
  66                                          const gchar *data,
  67                                          guint        len);
  68 static gint pop3_delete_send            (Pop3Session *session);
  69 static gint pop3_delete_recv            (Pop3Session *session);
  70 static gint pop3_logout_send            (Pop3Session *session);
  71
  72 static void pop3_gen_send               (Pop3Session    *session,
  73                                          const gchar    *format, ...);
  74
  75 static void pop3_session_destroy        (Session        *session);
  76
  77 static gint pop3_write_msg_to_file      (const gchar    *file,
  78                                          const gchar    *data,
  79                                          guint           len);
  80
  81 static Pop3State pop3_lookup_next       (Pop3Session    *session);
  82 static Pop3ErrorValue pop3_ok           (Pop3Session    *session,
  83                                          const gchar    *msg);
  84
  85 static gint pop3_session_recv_msg               (Session        *session,
  86                                                  const gchar    *msg);
  87 static gint pop3_session_recv_data_finished     (Session        *session,
  88                                                  guchar         *data,
  89                                                  guint           len);
  90
  91
  92 static gint pop3_greeting_recv(Pop3Session *session, const gchar *msg)
  93 {
  94         session->state = POP3_GREETING;
  95
  96         session->greeting = g_strdup(msg);
  97         return PS_SUCCESS;
  98 }
  99
 100 #if USE_OPENSSL
 101 static gint pop3_stls_send(Pop3Session *session)
 102 {
 103         session->state = POP3_STLS;
 104         pop3_gen_send(session, "STLS");
 105         return PS_SUCCESS;
 106 }
 107
 108 static gint pop3_stls_recv(Pop3Session *session)
 109 {
 110         if (session_start_tls(SESSION(session)) < 0) {
 111                 session->error_val = PS_SOCKET;
 112                 return -1;
 113         }
 114         return PS_SUCCESS;
 115 }
 116 #endif /* USE_OPENSSL */
 117
 118 static gint pop3_getauth_user_send(Pop3Session *session)
 119 {
 120         g_return_val_if_fail(session->user != NULL, -1);
 121
 122         session->state = POP3_GETAUTH_USER;
 123         pop3_gen_send(session, "USER %s", session->user);
 124         return PS_SUCCESS;
 125 }
 126
 127 static gint pop3_getauth_pass_send(Pop3Session *session)
 128 {
 129         g_return_val_if_fail(session->pass != NULL, -1);
 130
 131         session->state = POP3_GETAUTH_PASS;
 132         pop3_gen_send(session, "PASS %s", session->pass);
 133         return PS_SUCCESS;
 134 }
 135
 136 static gint pop3_getauth_apop_send(Pop3Session *session)
 137 {
 138         gchar *start, *end;
 139         gchar *apop_str;
 140         gchar md5sum[33];
 141
 142         g_return_val_if_fail(session->user != NULL, -1);
 143         g_return_val_if_fail(session->pass != NULL, -1);
 144
 145         session->state = POP3_GETAUTH_APOP;
 146
 147         if ((start = strchr(session->greeting, '<')) == NULL) {
 148                 log_warning(_("Required APOP timestamp not found "
 149                               "in greeting\n"));
 150                 session->error_val = PS_PROTOCOL;
 151                 return -1;
 152         }
 153
 154         if ((end = strchr(start, '>')) == NULL || end == start + 1) {
 155                 log_warning(_("Timestamp syntax error in greeting\n"));
 156                 session->error_val = PS_PROTOCOL;
 157                 return -1;
 158         }
 159
 160         *(end + 1) = '\0';
 161
 162         apop_str = g_strconcat(start, session->pass, NULL);
 163         md5_hex_digest(md5sum, apop_str);
 164         g_free(apop_str);
 165
 166         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 167
 168         return PS_SUCCESS;
 169 }
 170
 171 static gint pop3_getrange_stat_send(Pop3Session *session)
 172 {
 173         session->state = POP3_GETRANGE_STAT;
 174         pop3_gen_send(session, "STAT");
 175         return PS_SUCCESS;
 176 }
 177
 178 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 179 {
 180         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 181                 log_warning(_("POP3 protocol error\n"));
 182                 session->error_val = PS_PROTOCOL;
 183                 return -1;
 184         } else {
 185                 if (session->count == 0) {
 186                         session->uidl_is_valid = TRUE;
 187                 } else {
 188                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 189                         session->cur_msg = 1;
 190                 }
 191         }
 192
 193         return PS_SUCCESS;
 194 }
 195
 196 static gint pop3_getrange_last_send(Pop3Session *session)
 197 {
 198         session->state = POP3_GETRANGE_LAST;
 199         pop3_gen_send(session, "LAST");
 200         return PS_SUCCESS;
 201 }
 202
 203 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 204 {
 205         gint last;
 206
 207         if (sscanf(msg, "%d", &last) == 0) {
 208                 log_warning(_("POP3 protocol error\n"));
 209                 session->error_val = PS_PROTOCOL;
 210                 return -1;
 211         } else {
 212                 if (session->count > last)
 213                         session->cur_msg = last + 1;
 214                 else
 215                         session->cur_msg = 0;
 216         }
 217
 218         return PS_SUCCESS;
 219 }
 220
 221 static gint pop3_getrange_uidl_send(Pop3Session *session)
 222 {
 223         session->state = POP3_GETRANGE_UIDL;
 224         pop3_gen_send(session, "UIDL");
 225         return PS_SUCCESS;
 226 }
 227
 228 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *msg)
 229 {
 230         gchar id[IDLEN + 1];
 231         gint num;
 232         time_t recv_time;
 233
 234         if (msg[0] == '.') {
 235                 session->uidl_is_valid = TRUE;
 236                 return PS_SUCCESS;
 237         }
 238
 239         if (sscanf(msg, "%d %" Xstr(IDLEN) "s", &num, id) != 2)
 240                 return -1;
 241         if (num <= 0 || num > session->count)
 242                 return -1;
 243
 244         session->msg[num].uidl = g_strdup(id);
 245
 246         if (!session->uidl_table)
 247                 return PS_CONTINUE;
 248
 249         recv_time = (time_t)g_hash_table_lookup(session->uidl_table, id);
 250         session->msg[num].recv_time = recv_time;
 251
 252         if (!session->ac_prefs->getall && recv_time != RECV_TIME_NONE)
 253                 session->msg[num].received = TRUE;
 254
 255         if (!session->new_msg_exist &&
 256             (session->ac_prefs->getall || recv_time == RECV_TIME_NONE ||
 257              session->ac_prefs->rmmail)) {
 258                 session->cur_msg = num;
 259                 session->new_msg_exist = TRUE;
 260         }
 261
 262         return PS_CONTINUE;
 263 }
 264
 265 static gint pop3_getsize_list_send(Pop3Session *session)
 266 {
 267         session->state = POP3_GETSIZE_LIST;
 268         pop3_gen_send(session, "LIST");
 269         return PS_SUCCESS;
 270 }
 271
 272 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *msg)
 273 {
 274         guint num, size;
 275
 276         if (msg[0] == '.')
 277                 return PS_SUCCESS;
 278
 279         if (sscanf(msg, "%u %u", &num, &size) != 2) {
 280                 session->error_val = PS_PROTOCOL;
 281                 return -1;
 282         }
 283
 284         if (num > 0 && num <= session->count)
 285                 session->msg[num].size = size;
 286         if (num > 0 && num < session->cur_msg)
 287                 session->cur_total_bytes += size;
 288
 289         return PS_CONTINUE;
 290 }
 291
 292 static gint pop3_retr_send(Pop3Session *session)
 293 {
 294         session->state = POP3_RETR;
 295         pop3_gen_send(session, "RETR %d", session->cur_msg);
 296         return PS_SUCCESS;
 297 }
 298
 299 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 300 {
 301         gchar *file;
 302         gint drop_ok;
 303
 304         file = get_tmp_file();
 305         if (pop3_write_msg_to_file(file, data, len) < 0) {
 306                 g_free(file);
 307                 session->error_val = PS_IOERR;
 308                 return -1;
 309         }
 310
 311         /* drop_ok: 0: success 1: don't receive -1: error */
 312         drop_ok = inc_drop_message(file, session);
 313         g_free(file);
 314         if (drop_ok < 0) {
 315                 session->error_val = PS_IOERR;
 316                 return -1;
 317         }
 318
 319         session->cur_total_bytes += session->msg[session->cur_msg].size;
 320         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 321         session->cur_total_num++;
 322
 323         session->msg[session->cur_msg].received = TRUE;
 324         session->msg[session->cur_msg].recv_time =
 325                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 326
 327         return PS_SUCCESS;
 328 }
 329
 330 static gint pop3_delete_send(Pop3Session *session)
 331 {
 332         session->state = POP3_DELETE;
 333         pop3_gen_send(session, "DELE %d", session->cur_msg);
 334         return PS_SUCCESS;
 335 }
 336
 337 static gint pop3_delete_recv(Pop3Session *session)
 338 {
 339         session->msg[session->cur_msg].deleted = TRUE;
 340         return PS_SUCCESS;
 341 }
 342
 343 static gint pop3_logout_send(Pop3Session *session)
 344 {
 345         session->state = POP3_LOGOUT;
 346         pop3_gen_send(session, "QUIT");
 347         return PS_SUCCESS;
 348 }
 349
 350 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 351 {
 352         gchar buf[POPBUFSIZE + 1];
 353         va_list args;
 354
 355         va_start(args, format);
 356         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 357         va_end(args);
 358
 359         if (!strncasecmp(buf, "PASS ", 5))
 360                 log_print("POP3> PASS ********\n");
 361         else
 362                 log_print("POP3> %s\n", buf);
 363
 364         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 365 }
 366
 367 Session *pop3_session_new(PrefsAccount *account)
 368 {
 369         Pop3Session *session;
 370
 371         g_return_val_if_fail(account != NULL, NULL);
 372
 373         session = g_new0(Pop3Session, 1);
 374
 375         SESSION(session)->type = SESSION_POP3;
 376         SESSION(session)->server = NULL;
 377         SESSION(session)->port = 0;
 378         SESSION(session)->sock = NULL;
 379         SESSION(session)->state = SESSION_READY;
 380         SESSION(session)->data = NULL;
 381
 382         SESSION(session)->recv_msg = pop3_session_recv_msg;
 383         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 384         SESSION(session)->send_data_finished = NULL;
 385
 386         SESSION(session)->destroy = pop3_session_destroy;
 387
 388         session->state = POP3_READY;
 389         session->ac_prefs = account;
 390         session->uidl_table = pop3_get_uidl_table(account);
 391         session->current_time = time(NULL);
 392         session->error_val = PS_SUCCESS;
 393         session->error_msg = NULL;
 394
 395         return SESSION(session);
 396 }
 397
 398 static void pop3_session_destroy(Session *session)
 399 {
 400         Pop3Session *pop3_session = POP3_SESSION(session);
 401         gint n;
 402
 403         g_return_if_fail(session != NULL);
 404
 405         for (n = 1; n <= pop3_session->count; n++)
 406                 g_free(pop3_session->msg[n].uidl);
 407         g_free(pop3_session->msg);
 408
 409         if (pop3_session->uidl_table) {
 410                 hash_free_strings(pop3_session->uidl_table);
 411                 g_hash_table_destroy(pop3_session->uidl_table);
 412         }
 413
 414         g_free(pop3_session->greeting);
 415         g_free(pop3_session->user);
 416         g_free(pop3_session->pass);
 417         g_free(pop3_session->error_msg);
 418 }
 419
 420 GHashTable *pop3_get_uidl_table(PrefsAccount *ac_prefs)
 421 {
 422         GHashTable *table;
 423         gchar *path;
 424         FILE *fp;
 425         gchar buf[POPBUFSIZE];
 426         gchar uidl[POPBUFSIZE];
 427         time_t recv_time;
 428         time_t now;
 429
 430         table = g_hash_table_new(g_str_hash, g_str_equal);
 431
 432         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 433                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 434                            "-", ac_prefs->userid, NULL);
 435         if ((fp = fopen(path, "rb")) == NULL) {
 436                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 437                 g_free(path);
 438                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 439                                    "uidl-", ac_prefs->recv_server,
 440                                    "-", ac_prefs->userid, NULL);
 441                 if ((fp = fopen(path, "rb")) == NULL) {
 442                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 443                         g_free(path);
 444                         return table;
 445                 }
 446         }
 447         g_free(path);
 448
 449         now = time(NULL);
 450
 451         while (fgets(buf, sizeof(buf), fp) != NULL) {
 452                 strretchomp(buf);
 453                 recv_time = RECV_TIME_NONE;
 454                 if (sscanf(buf, "%s\t%ld", uidl, &recv_time) != 2) {
 455                         if (sscanf(buf, "%s", uidl) != 1)
 456                                 continue;
 457                         else
 458                                 recv_time = now;
 459                 }
 460                 if (recv_time == RECV_TIME_NONE)
 461                         recv_time = RECV_TIME_RECEIVED;
 462                 g_hash_table_insert(table, g_strdup(uidl),
 463                                     GINT_TO_POINTER(recv_time));
 464         }
 465
 466         fclose(fp);
 467         return table;
 468 }
 469
 470 gint pop3_write_uidl_list(Pop3Session *session)
 471 {
 472         gchar *path;
 473         FILE *fp;
 474         Pop3MsgInfo *msg;
 475         gint n;
 476
 477         if (!session->uidl_is_valid) return 0;
 478
 479         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 480                            "uidl", G_DIR_SEPARATOR_S,
 481                            session->ac_prefs->recv_server,
 482                            "-", session->ac_prefs->userid, NULL);
 483         if ((fp = fopen(path, "wb")) == NULL) {
 484                 FILE_OP_ERROR(path, "fopen");
 485                 g_free(path);
 486                 return -1;
 487         }
 488
 489         for (n = 1; n <= session->count; n++) {
 490                 msg = &session->msg[n];
 491                 if (msg->uidl && msg->received && !msg->deleted)
 492                         fprintf(fp, "%s\t%ld\n", msg->uidl, msg->recv_time);
 493         }
 494
 495         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 496         g_free(path);
 497
 498         return 0;
 499 }
 500
 501 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 502                                    guint len)
 503 {
 504         FILE *fp;
 505         const gchar *prev, *cur;
 506
 507         g_return_val_if_fail(file != NULL, -1);
 508
 509         if ((fp = fopen(file, "wb")) == NULL) {
 510                 FILE_OP_ERROR(file, "fopen");
 511                 return -1;
 512         }
 513
 514         if (change_file_mode_rw(fp, file) < 0)
 515                 FILE_OP_ERROR(file, "chmod");
 516
 517         /* +------------------+----------------+--------------------------+ *
 518          * ^data              ^prev            ^cur             data+len-1^ */
 519
 520         prev = data;
 521         while ((cur = memchr(prev, '\r', len - (prev - data))) != NULL) {
 522                 if ((cur > prev && fwrite(prev, cur - prev, 1, fp) < 1) ||
 523                     fputc('\n', fp) == EOF) {
 524                         FILE_OP_ERROR(file, "fwrite");
 525                         g_warning("can't write to file: %s\n", file);
 526                         fclose(fp);
 527                         unlink(file);
 528                         return -1;
 529                 }
 530
 531                 if (cur == data + len - 1) {
 532                         prev = cur + 1;
 533                         break;
 534                 }
 535
 536                 if (*(cur + 1) == '\n')
 537                         prev = cur + 2;
 538                 else
 539                         prev = cur + 1;
 540
 541                 if (prev - data >= len)
 542                         break;
 543         }
 544
 545         if (prev - data < len &&
 546             fwrite(prev, len - (prev - data), 1, fp) < 1) {
 547                 FILE_OP_ERROR(file, "fwrite");
 548                 g_warning("can't write to file: %s\n", file);
 549                 fclose(fp);
 550                 unlink(file);
 551                 return -1;
 552         }
 553         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 554                 if (fputc('\n', fp) == EOF) {
 555                         FILE_OP_ERROR(file, "fputc");
 556                         g_warning("can't write to file: %s\n", file);
 557                         fclose(fp);
 558                         unlink(file);
 559                         return -1;
 560                 }
 561         }
 562
 563         if (fclose(fp) == EOF) {
 564                 FILE_OP_ERROR(file, "fclose");
 565                 unlink(file);
 566                 return -1;
 567         }
 568
 569         return 0;
 570 }
 571
 572 static Pop3State pop3_lookup_next(Pop3Session *session)
 573 {
 574         Pop3MsgInfo *msg;
 575         PrefsAccount *ac = session->ac_prefs;
 576         gint size;
 577         gboolean size_limit_over;
 578
 579         for (;;) {
 580                 msg = &session->msg[session->cur_msg];
 581                 size = msg->size;
 582                 size_limit_over =
 583                     (ac->enable_size_limit &&
 584                      ac->size_limit > 0 &&
 585                      size > ac->size_limit * 1024);
 586
 587                 if (ac->rmmail &&
 588                     msg->recv_time != RECV_TIME_NONE &&
 589                     msg->recv_time != RECV_TIME_KEEP &&
 590                     session->current_time - msg->recv_time >=
 591                     ac->msg_leave_time * 24 * 60 * 60) {
 592                         log_print(_("POP3: Deleting expired message %d\n"),
 593                                   session->cur_msg);
 594                         pop3_delete_send(session);
 595                         return POP3_DELETE;
 596                 }
 597
 598                 if (size_limit_over)
 599                         log_print
 600                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 601                                   session->cur_msg, size);
 602
 603                 if (size == 0 || msg->received || size_limit_over) {
 604                         session->cur_total_bytes += size;
 605                         if (session->cur_msg == session->count) {
 606                                 pop3_logout_send(session);
 607                                 return POP3_LOGOUT;
 608                         } else
 609                                 session->cur_msg++;
 610                 } else
 611                         break;
 612         }
 613
 614         pop3_retr_send(session);
 615         return POP3_RETR;
 616 }
 617
 618 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 619 {
 620         Pop3ErrorValue ok;
 621
 622         log_print("POP3< %s\n", msg);
 623
 624         if (!strncmp(msg, "+OK", 3))
 625                 ok = PS_SUCCESS;
 626         else if (!strncmp(msg, "-ERR", 4)) {
 627                 if (strstr(msg + 4, "lock") ||
 628                     strstr(msg + 4, "Lock") ||
 629                     strstr(msg + 4, "LOCK") ||
 630                     strstr(msg + 4, "wait")) {
 631                         log_warning(_("mailbox is locked\n"));
 632                         ok = PS_LOCKBUSY;
 633                 } else if (strcasestr(msg + 4, "timeout")) {
 634                         log_warning(_("session timeout\n"));
 635                         ok = PS_ERROR;
 636                 } else {
 637                         switch (session->state) {
 638 #if USE_OPENSSL
 639                         case POP3_STLS:
 640                                 log_warning(_("can't start TLS session\n"));
 641                                 ok = PS_ERROR;
 642                                 break;
 643 #endif
 644                         case POP3_GETAUTH_USER:
 645                         case POP3_GETAUTH_PASS:
 646                         case POP3_GETAUTH_APOP:
 647                                 log_warning(_("error occurred on authentication\n"));
 648                                 ok = PS_AUTHFAIL;
 649                                 break;
 650                         case POP3_GETRANGE_LAST:
 651                         case POP3_GETRANGE_UIDL:
 652                                 log_warning(_("command not supported\n"));
 653                                 ok = PS_NOTSUPPORTED;
 654                                 break;
 655                         default:
 656                                 log_warning(_("error occurred on POP3 session\n"));
 657                                 ok = PS_ERROR;
 658                         }
 659                 }
 660
 661                 g_free(session->error_msg);
 662                 session->error_msg = g_strdup(msg);
 663                 fprintf(stderr, "POP3: %s\n", msg);
 664         } else
 665                 ok = PS_PROTOCOL;
 666
 667         session->error_val = ok;
 668         return ok;
 669 }
 670
 671 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 672 {
 673         Pop3Session *pop3_session = POP3_SESSION(session);
 674         Pop3ErrorValue val = PS_SUCCESS;
 675         const gchar *body;
 676
 677         body = msg;
 678         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 679             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 680                 val = pop3_ok(pop3_session, msg);
 681                 if (val != PS_SUCCESS) {
 682                         if (val != PS_NOTSUPPORTED) {
 683                                 pop3_session->state = POP3_ERROR;
 684                                 return -1;
 685                         }
 686                 }
 687
 688                 if (*body == '+' || *body == '-')
 689                         body++;
 690                 while (isalpha(*body))
 691                         body++;
 692                 while (isspace(*body))
 693                         body++;
 694         }
 695
 696         switch (pop3_session->state) {
 697         case POP3_READY:
 698         case POP3_GREETING:
 699                 pop3_greeting_recv(pop3_session, body);
 700 #if USE_OPENSSL
 701                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 702                         pop3_stls_send(pop3_session);
 703                 else
 704 #endif
 705                 if (pop3_session->ac_prefs->protocol == A_APOP)
 706                         pop3_getauth_apop_send(pop3_session);
 707                 else
 708                         pop3_getauth_user_send(pop3_session);
 709                 break;
 710 #if USE_OPENSSL
 711         case POP3_STLS:
 712                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 713                         return -1;
 714                 if (pop3_session->ac_prefs->protocol == A_APOP)
 715                         pop3_getauth_apop_send(pop3_session);
 716                 else
 717                         pop3_getauth_user_send(pop3_session);
 718                 break;
 719 #endif
 720         case POP3_GETAUTH_USER:
 721                 pop3_getauth_pass_send(pop3_session);
 722                 break;
 723         case POP3_GETAUTH_PASS:
 724         case POP3_GETAUTH_APOP:
 725                 pop3_getrange_stat_send(pop3_session);
 726                 break;
 727         case POP3_GETRANGE_STAT:
 728                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 729                         return -1;
 730                 if (pop3_session->count > 0)
 731                         pop3_getrange_uidl_send(pop3_session);
 732                 else
 733                         pop3_logout_send(pop3_session);
 734                 break;
 735         case POP3_GETRANGE_LAST:
 736                 if (val == PS_NOTSUPPORTED)
 737                         pop3_session->error_val = PS_SUCCESS;
 738                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 739                         return -1;
 740                 if (pop3_session->cur_msg > 0)
 741                         pop3_getsize_list_send(pop3_session);
 742                 else
 743                         pop3_logout_send(pop3_session);
 744                 break;
 745         case POP3_GETRANGE_UIDL:
 746                 if (val == PS_NOTSUPPORTED) {
 747                         pop3_session->error_val = PS_SUCCESS;
 748                         pop3_getrange_last_send(pop3_session);
 749                 } else {
 750                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
 751                         return 1;
 752                 }
 753                 break;
 754         case POP3_GETRANGE_UIDL_RECV:
 755                 val = pop3_getrange_uidl_recv(pop3_session, body);
 756                 if (val == PS_CONTINUE)
 757                         return 1;
 758                 else if (val == PS_SUCCESS) {
 759                         if (pop3_session->new_msg_exist)
 760                                 pop3_getsize_list_send(pop3_session);
 761                         else
 762                                 pop3_logout_send(pop3_session);
 763                 } else
 764                         return -1;
 765                 break;
 766         case POP3_GETSIZE_LIST:
 767                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
 768                 return 1;
 769         case POP3_GETSIZE_LIST_RECV:
 770                 val = pop3_getsize_list_recv(pop3_session, body);
 771                 if (val == PS_CONTINUE)
 772                         return 1;
 773                 else if (val == PS_SUCCESS) {
 774                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 775                                 return -1;
 776                 } else
 777                         return -1;
 778                 break;
 779         case POP3_RETR:
 780                 pop3_session->state = POP3_RETR_RECV;
 781                 session_recv_data
 782                         (session,
 783                          pop3_session->msg[pop3_session->cur_msg].size, TRUE);
 784                 break;
 785         case POP3_DELETE:
 786                 pop3_delete_recv(pop3_session);
 787                 if (pop3_session->cur_msg == pop3_session->count)
 788                         pop3_logout_send(pop3_session);
 789                 else {
 790                         pop3_session->cur_msg++;
 791                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 792                                 return -1;
 793                 }
 794                 break;
 795         case POP3_LOGOUT:
 796                 session_disconnect(session);
 797                 break;
 798         case POP3_ERROR:
 799         default:
 800                 return -1;
 801         }
 802
 803         return 0;
 804 }
 805
 806 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
 807                                             guint len)
 808 {
 809         Pop3Session *pop3_session = POP3_SESSION(session);
 810
 811         if (len == 0)
 812                 return -1;
 813
 814         if (pop3_retr_recv(pop3_session, data, len) < 0)
 815                 return -1;
 816
 817         if (pop3_session->ac_prefs->rmmail &&
 818             pop3_session->ac_prefs->msg_leave_time == 0 &&
 819             pop3_session->msg[pop3_session->cur_msg].recv_time
 820             != RECV_TIME_KEEP)
 821                 pop3_delete_send(pop3_session);
 822         else if (pop3_session->cur_msg == pop3_session->count)
 823                 pop3_logout_send(pop3_session);
 824         else {
 825                 pop3_session->cur_msg++;
 826                 if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 827                         return -1;
 828         }
 829
 830         return 0;
 831 }