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