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 #include "hooks.h"
  43
  44 static gint pop3_greeting_recv          (Pop3Session *session,
  45                                          const gchar *msg);
  46 static gint pop3_getauth_user_send      (Pop3Session *session);
  47 static gint pop3_getauth_pass_send      (Pop3Session *session);
  48 static gint pop3_getauth_apop_send      (Pop3Session *session);
  49 #if USE_OPENSSL
  50 static gint pop3_stls_send              (Pop3Session *session);
  51 static gint pop3_stls_recv              (Pop3Session *session);
  52 #endif
  53 static gint pop3_getrange_stat_send     (Pop3Session *session);
  54 static gint pop3_getrange_stat_recv     (Pop3Session *session,
  55                                          const gchar *msg);
  56 static gint pop3_getrange_last_send     (Pop3Session *session);
  57 static gint pop3_getrange_last_recv     (Pop3Session *session,
  58                                          const gchar *msg);
  59 static gint pop3_getrange_uidl_send     (Pop3Session *session);
  60 static gint pop3_getrange_uidl_recv     (Pop3Session *session,
  61                                          const gchar *msg);
  62 static gint pop3_getsize_list_send      (Pop3Session *session);
  63 static gint pop3_getsize_list_recv      (Pop3Session *session,
  64                                          const gchar *msg);
  65 static gint pop3_retr_send              (Pop3Session *session);
  66 static gint pop3_retr_recv              (Pop3Session *session,
  67                                          const gchar *data,
  68                                          guint        len);
  69 static gint pop3_delete_send            (Pop3Session *session);
  70 static gint pop3_delete_recv            (Pop3Session *session);
  71 static gint pop3_logout_send            (Pop3Session *session);
  72
  73 static void pop3_gen_send               (Pop3Session    *session,
  74                                          const gchar    *format, ...);
  75
  76 static void pop3_session_destroy        (Session        *session);
  77
  78 static gint pop3_write_msg_to_file      (const gchar    *file,
  79                                          const gchar    *data,
  80                                          guint           len);
  81
  82 static Pop3State pop3_lookup_next       (Pop3Session    *session);
  83 static Pop3ErrorValue pop3_ok           (Pop3Session    *session,
  84                                          const gchar    *msg);
  85
  86 static gint pop3_session_recv_msg               (Session        *session,
  87                                                  const gchar    *msg);
  88 static gint pop3_session_recv_data_finished     (Session        *session,
  89                                                  guchar         *data,
  90                                                  guint           len);
  91
  92
  93 static gint pop3_greeting_recv(Pop3Session *session, const gchar *msg)
  94 {
  95         session->state = POP3_GREETING;
  96
  97         session->greeting = g_strdup(msg);
  98         return PS_SUCCESS;
  99 }
 100
 101 #if USE_OPENSSL
 102 static gint pop3_stls_send(Pop3Session *session)
 103 {
 104         session->state = POP3_STLS;
 105         pop3_gen_send(session, "STLS");
 106         return PS_SUCCESS;
 107 }
 108
 109 static gint pop3_stls_recv(Pop3Session *session)
 110 {
 111         if (session_start_tls(SESSION(session)) < 0) {
 112                 session->error_val = PS_SOCKET;
 113                 return -1;
 114         }
 115         return PS_SUCCESS;
 116 }
 117 #endif /* USE_OPENSSL */
 118
 119 static gint pop3_getauth_user_send(Pop3Session *session)
 120 {
 121         g_return_val_if_fail(session->user != NULL, -1);
 122
 123         session->state = POP3_GETAUTH_USER;
 124         pop3_gen_send(session, "USER %s", session->user);
 125         return PS_SUCCESS;
 126 }
 127
 128 static gint pop3_getauth_pass_send(Pop3Session *session)
 129 {
 130         g_return_val_if_fail(session->pass != NULL, -1);
 131
 132         session->state = POP3_GETAUTH_PASS;
 133         pop3_gen_send(session, "PASS %s", session->pass);
 134         return PS_SUCCESS;
 135 }
 136
 137 static gint pop3_getauth_apop_send(Pop3Session *session)
 138 {
 139         gchar *start, *end;
 140         gchar *apop_str;
 141         gchar md5sum[33];
 142
 143         g_return_val_if_fail(session->user != NULL, -1);
 144         g_return_val_if_fail(session->pass != NULL, -1);
 145
 146         session->state = POP3_GETAUTH_APOP;
 147
 148         if ((start = strchr(session->greeting, '<')) == NULL) {
 149                 log_warning(_("Required APOP timestamp not found "
 150                               "in greeting\n"));
 151                 session->error_val = PS_PROTOCOL;
 152                 return -1;
 153         }
 154
 155         if ((end = strchr(start, '>')) == NULL || end == start + 1) {
 156                 log_warning(_("Timestamp syntax error in greeting\n"));
 157                 session->error_val = PS_PROTOCOL;
 158                 return -1;
 159         }
 160
 161         *(end + 1) = '\0';
 162
 163         apop_str = g_strconcat(start, session->pass, NULL);
 164         md5_hex_digest(md5sum, apop_str);
 165         g_free(apop_str);
 166
 167         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 168
 169         return PS_SUCCESS;
 170 }
 171
 172 static gint pop3_getrange_stat_send(Pop3Session *session)
 173 {
 174         session->state = POP3_GETRANGE_STAT;
 175         pop3_gen_send(session, "STAT");
 176         return PS_SUCCESS;
 177 }
 178
 179 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 180 {
 181         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 182                 log_warning(_("POP3 protocol error\n"));
 183                 session->error_val = PS_PROTOCOL;
 184                 return -1;
 185         } else {
 186                 if (session->count == 0) {
 187                         session->uidl_is_valid = TRUE;
 188                 } else {
 189                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 190                         session->cur_msg = 1;
 191                 }
 192         }
 193
 194         return PS_SUCCESS;
 195 }
 196
 197 static gint pop3_getrange_last_send(Pop3Session *session)
 198 {
 199         session->state = POP3_GETRANGE_LAST;
 200         pop3_gen_send(session, "LAST");
 201         return PS_SUCCESS;
 202 }
 203
 204 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 205 {
 206         gint last;
 207
 208         if (sscanf(msg, "%d", &last) == 0) {
 209                 log_warning(_("POP3 protocol error\n"));
 210                 session->error_val = PS_PROTOCOL;
 211                 return -1;
 212         } else {
 213                 if (session->count > last)
 214                         session->cur_msg = last + 1;
 215                 else
 216                         session->cur_msg = 0;
 217         }
 218
 219         return PS_SUCCESS;
 220 }
 221
 222 static gint pop3_getrange_uidl_send(Pop3Session *session)
 223 {
 224         session->state = POP3_GETRANGE_UIDL;
 225         pop3_gen_send(session, "UIDL");
 226         return PS_SUCCESS;
 227 }
 228
 229 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *msg)
 230 {
 231         gchar id[IDLEN + 1];
 232         gint num;
 233         time_t recv_time;
 234
 235         if (msg[0] == '.') {
 236                 session->uidl_is_valid = TRUE;
 237                 return PS_SUCCESS;
 238         }
 239
 240         if (sscanf(msg, "%d %" Xstr(IDLEN) "s", &num, id) != 2)
 241                 return -1;
 242         if (num <= 0 || num > session->count)
 243                 return -1;
 244
 245         session->msg[num].uidl = g_strdup(id);
 246
 247         if (!session->uidl_table)
 248                 return PS_CONTINUE;
 249
 250         recv_time = (time_t)g_hash_table_lookup(session->uidl_table, id);
 251         session->msg[num].recv_time = recv_time;
 252
 253         if (!session->ac_prefs->getall && recv_time != RECV_TIME_NONE)
 254                 session->msg[num].received = TRUE;
 255
 256         if (!session->new_msg_exist &&
 257             (session->ac_prefs->getall || recv_time == RECV_TIME_NONE ||
 258              session->ac_prefs->rmmail)) {
 259                 session->cur_msg = num;
 260                 session->new_msg_exist = TRUE;
 261         }
 262
 263         return PS_CONTINUE;
 264 }
 265
 266 static gint pop3_getsize_list_send(Pop3Session *session)
 267 {
 268         session->state = POP3_GETSIZE_LIST;
 269         pop3_gen_send(session, "LIST");
 270         return PS_SUCCESS;
 271 }
 272
 273 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *msg)
 274 {
 275         guint num, size;
 276
 277         if (msg[0] == '.')
 278                 return PS_SUCCESS;
 279
 280         if (sscanf(msg, "%u %u", &num, &size) != 2) {
 281                 session->error_val = PS_PROTOCOL;
 282                 return -1;
 283         }
 284
 285         if (num > 0 && num <= session->count)
 286                 session->msg[num].size = size;
 287         if (num > 0 && num < session->cur_msg)
 288                 session->cur_total_bytes += size;
 289
 290         return PS_CONTINUE;
 291 }
 292
 293 static gint pop3_retr_send(Pop3Session *session)
 294 {
 295         session->state = POP3_RETR;
 296         pop3_gen_send(session, "RETR %d", session->cur_msg);
 297         return PS_SUCCESS;
 298 }
 299
 300 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 301 {
 302         gchar *file;
 303         gint drop_ok;
 304         MailReceiveData mail_receive_data;
 305
 306         mail_receive_data.session = session;
 307         mail_receive_data.data = g_strndup(data, len);
 308         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 309
 310         file = get_tmp_file();
 311         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 312                 strlen(mail_receive_data.data)) < 0) {
 313                 g_free(file);
 314                 g_free(mail_receive_data.data);
 315                 session->error_val = PS_IOERR;
 316                 return -1;
 317         }
 318         g_free(mail_receive_data.data);
 319
 320         /* drop_ok: 0: success 1: don't receive -1: error */
 321         drop_ok = inc_drop_message(file, session);
 322         g_free(file);
 323         if (drop_ok < 0) {
 324                 session->error_val = PS_IOERR;
 325                 return -1;
 326         }
 327
 328         session->cur_total_bytes += session->msg[session->cur_msg].size;
 329         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 330         session->cur_total_num++;
 331
 332         session->msg[session->cur_msg].received = TRUE;
 333         session->msg[session->cur_msg].recv_time =
 334                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 335
 336         return PS_SUCCESS;
 337 }
 338
 339 static gint pop3_delete_send(Pop3Session *session)
 340 {
 341         session->state = POP3_DELETE;
 342         pop3_gen_send(session, "DELE %d", session->cur_msg);
 343         return PS_SUCCESS;
 344 }
 345
 346 static gint pop3_delete_recv(Pop3Session *session)
 347 {
 348         session->msg[session->cur_msg].deleted = TRUE;
 349         return PS_SUCCESS;
 350 }
 351
 352 static gint pop3_logout_send(Pop3Session *session)
 353 {
 354         session->state = POP3_LOGOUT;
 355         pop3_gen_send(session, "QUIT");
 356         return PS_SUCCESS;
 357 }
 358
 359 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 360 {
 361         gchar buf[POPBUFSIZE + 1];
 362         va_list args;
 363
 364         va_start(args, format);
 365         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 366         va_end(args);
 367
 368         if (!strncasecmp(buf, "PASS ", 5))
 369                 log_print("POP3> PASS ********\n");
 370         else
 371                 log_print("POP3> %s\n", buf);
 372
 373         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 374 }
 375
 376 Session *pop3_session_new(PrefsAccount *account)
 377 {
 378         Pop3Session *session;
 379
 380         g_return_val_if_fail(account != NULL, NULL);
 381
 382         session = g_new0(Pop3Session, 1);
 383
 384         SESSION(session)->type = SESSION_POP3;
 385         SESSION(session)->server = NULL;
 386         SESSION(session)->port = 0;
 387         SESSION(session)->sock = NULL;
 388         SESSION(session)->state = SESSION_READY;
 389         SESSION(session)->data = NULL;
 390
 391         SESSION(session)->recv_msg = pop3_session_recv_msg;
 392         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 393         SESSION(session)->send_data_finished = NULL;
 394
 395         SESSION(session)->destroy = pop3_session_destroy;
 396
 397         session->state = POP3_READY;
 398         session->ac_prefs = account;
 399         session->uidl_table = pop3_get_uidl_table(account);
 400         session->current_time = time(NULL);
 401         session->error_val = PS_SUCCESS;
 402         session->error_msg = NULL;
 403
 404         return SESSION(session);
 405 }
 406
 407 static void pop3_session_destroy(Session *session)
 408 {
 409         Pop3Session *pop3_session = POP3_SESSION(session);
 410         gint n;
 411
 412         g_return_if_fail(session != NULL);
 413
 414         for (n = 1; n <= pop3_session->count; n++)
 415                 g_free(pop3_session->msg[n].uidl);
 416         g_free(pop3_session->msg);
 417
 418         if (pop3_session->uidl_table) {
 419                 hash_free_strings(pop3_session->uidl_table);
 420                 g_hash_table_destroy(pop3_session->uidl_table);
 421         }
 422
 423         g_free(pop3_session->greeting);
 424         g_free(pop3_session->user);
 425         g_free(pop3_session->pass);
 426         g_free(pop3_session->error_msg);
 427 }
 428
 429 GHashTable *pop3_get_uidl_table(PrefsAccount *ac_prefs)
 430 {
 431         GHashTable *table;
 432         gchar *path;
 433         FILE *fp;
 434         gchar buf[POPBUFSIZE];
 435         gchar uidl[POPBUFSIZE];
 436         time_t recv_time;
 437         time_t now;
 438
 439         table = g_hash_table_new(g_str_hash, g_str_equal);
 440
 441         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 442                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 443                            "-", ac_prefs->userid, NULL);
 444         if ((fp = fopen(path, "rb")) == NULL) {
 445                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 446                 g_free(path);
 447                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 448                                    "uidl-", ac_prefs->recv_server,
 449                                    "-", ac_prefs->userid, NULL);
 450                 if ((fp = fopen(path, "rb")) == NULL) {
 451                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 452                         g_free(path);
 453                         return table;
 454                 }
 455         }
 456         g_free(path);
 457
 458         now = time(NULL);
 459
 460         while (fgets(buf, sizeof(buf), fp) != NULL) {
 461                 strretchomp(buf);
 462                 recv_time = RECV_TIME_NONE;
 463                 if (sscanf(buf, "%s\t%ld", uidl, &recv_time) != 2) {
 464                         if (sscanf(buf, "%s", uidl) != 1)
 465                                 continue;
 466                         else
 467                                 recv_time = now;
 468                 }
 469                 if (recv_time == RECV_TIME_NONE)
 470                         recv_time = RECV_TIME_RECEIVED;
 471                 g_hash_table_insert(table, g_strdup(uidl),
 472                                     GINT_TO_POINTER(recv_time));
 473         }
 474
 475         fclose(fp);
 476         return table;
 477 }
 478
 479 gint pop3_write_uidl_list(Pop3Session *session)
 480 {
 481         gchar *path;
 482         FILE *fp;
 483         Pop3MsgInfo *msg;
 484         gint n;
 485
 486         if (!session->uidl_is_valid) return 0;
 487
 488         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 489                            "uidl", G_DIR_SEPARATOR_S,
 490                            session->ac_prefs->recv_server,
 491                            "-", session->ac_prefs->userid, NULL);
 492         if ((fp = fopen(path, "wb")) == NULL) {
 493                 FILE_OP_ERROR(path, "fopen");
 494                 g_free(path);
 495                 return -1;
 496         }
 497
 498         for (n = 1; n <= session->count; n++) {
 499                 msg = &session->msg[n];
 500                 if (msg->uidl && msg->received && !msg->deleted)
 501                         fprintf(fp, "%s\t%ld\n", msg->uidl, msg->recv_time);
 502         }
 503
 504         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 505         g_free(path);
 506
 507         return 0;
 508 }
 509
 510 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 511                                    guint len)
 512 {
 513         FILE *fp;
 514         const gchar *prev, *cur;
 515
 516         g_return_val_if_fail(file != NULL, -1);
 517
 518         if ((fp = fopen(file, "wb")) == NULL) {
 519                 FILE_OP_ERROR(file, "fopen");
 520                 return -1;
 521         }
 522
 523         if (change_file_mode_rw(fp, file) < 0)
 524                 FILE_OP_ERROR(file, "chmod");
 525
 526         /* +------------------+----------------+--------------------------+ *
 527          * ^data              ^prev            ^cur             data+len-1^ */
 528
 529         prev = data;
 530         while ((cur = memchr(prev, '\r', len - (prev - data))) != NULL) {
 531                 if ((cur > prev && fwrite(prev, cur - prev, 1, fp) < 1) ||
 532                     fputc('\n', fp) == EOF) {
 533                         FILE_OP_ERROR(file, "fwrite");
 534                         g_warning("can't write to file: %s\n", file);
 535                         fclose(fp);
 536                         unlink(file);
 537                         return -1;
 538                 }
 539
 540                 if (cur == data + len - 1) {
 541                         prev = cur + 1;
 542                         break;
 543                 }
 544
 545                 if (*(cur + 1) == '\n')
 546                         prev = cur + 2;
 547                 else
 548                         prev = cur + 1;
 549
 550                 if (prev - data >= len)
 551                         break;
 552         }
 553
 554         if (prev - data < len &&
 555             fwrite(prev, len - (prev - data), 1, fp) < 1) {
 556                 FILE_OP_ERROR(file, "fwrite");
 557                 g_warning("can't write to file: %s\n", file);
 558                 fclose(fp);
 559                 unlink(file);
 560                 return -1;
 561         }
 562         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 563                 if (fputc('\n', fp) == EOF) {
 564                         FILE_OP_ERROR(file, "fputc");
 565                         g_warning("can't write to file: %s\n", file);
 566                         fclose(fp);
 567                         unlink(file);
 568                         return -1;
 569                 }
 570         }
 571
 572         if (fclose(fp) == EOF) {
 573                 FILE_OP_ERROR(file, "fclose");
 574                 unlink(file);
 575                 return -1;
 576         }
 577
 578         return 0;
 579 }
 580
 581 static Pop3State pop3_lookup_next(Pop3Session *session)
 582 {
 583         Pop3MsgInfo *msg;
 584         PrefsAccount *ac = session->ac_prefs;
 585         gint size;
 586         gboolean size_limit_over;
 587
 588         for (;;) {
 589                 msg = &session->msg[session->cur_msg];
 590                 size = msg->size;
 591                 size_limit_over =
 592                     (ac->enable_size_limit &&
 593                      ac->size_limit > 0 &&
 594                      size > ac->size_limit * 1024);
 595
 596                 if (ac->rmmail &&
 597                     msg->recv_time != RECV_TIME_NONE &&
 598                     msg->recv_time != RECV_TIME_KEEP &&
 599                     session->current_time - msg->recv_time >=
 600                     ac->msg_leave_time * 24 * 60 * 60) {
 601                         log_print(_("POP3: Deleting expired message %d\n"),
 602                                   session->cur_msg);
 603                         pop3_delete_send(session);
 604                         return POP3_DELETE;
 605                 }
 606
 607                 if (size_limit_over)
 608                         log_print
 609                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 610                                   session->cur_msg, size);
 611
 612                 if (size == 0 || msg->received || size_limit_over) {
 613                         session->cur_total_bytes += size;
 614                         if (session->cur_msg == session->count) {
 615                                 pop3_logout_send(session);
 616                                 return POP3_LOGOUT;
 617                         } else
 618                                 session->cur_msg++;
 619                 } else
 620                         break;
 621         }
 622
 623         pop3_retr_send(session);
 624         return POP3_RETR;
 625 }
 626
 627 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 628 {
 629         Pop3ErrorValue ok;
 630
 631         log_print("POP3< %s\n", msg);
 632
 633         if (!strncmp(msg, "+OK", 3))
 634                 ok = PS_SUCCESS;
 635         else if (!strncmp(msg, "-ERR", 4)) {
 636                 if (strstr(msg + 4, "lock") ||
 637                     strstr(msg + 4, "Lock") ||
 638                     strstr(msg + 4, "LOCK") ||
 639                     strstr(msg + 4, "wait")) {
 640                         log_warning(_("mailbox is locked\n"));
 641                         ok = PS_LOCKBUSY;
 642                 } else if (strcasestr(msg + 4, "timeout")) {
 643                         log_warning(_("session timeout\n"));
 644                         ok = PS_ERROR;
 645                 } else {
 646                         switch (session->state) {
 647 #if USE_OPENSSL
 648                         case POP3_STLS:
 649                                 log_warning(_("can't start TLS session\n"));
 650                                 ok = PS_ERROR;
 651                                 break;
 652 #endif
 653                         case POP3_GETAUTH_USER:
 654                         case POP3_GETAUTH_PASS:
 655                         case POP3_GETAUTH_APOP:
 656                                 log_warning(_("error occurred on authentication\n"));
 657                                 ok = PS_AUTHFAIL;
 658                                 break;
 659                         case POP3_GETRANGE_LAST:
 660                         case POP3_GETRANGE_UIDL:
 661                                 log_warning(_("command not supported\n"));
 662                                 ok = PS_NOTSUPPORTED;
 663                                 break;
 664                         default:
 665                                 log_warning(_("error occurred on POP3 session\n"));
 666                                 ok = PS_ERROR;
 667                         }
 668                 }
 669
 670                 g_free(session->error_msg);
 671                 session->error_msg = g_strdup(msg);
 672                 fprintf(stderr, "POP3: %s\n", msg);
 673         } else
 674                 ok = PS_PROTOCOL;
 675
 676         session->error_val = ok;
 677         return ok;
 678 }
 679
 680 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 681 {
 682         Pop3Session *pop3_session = POP3_SESSION(session);
 683         Pop3ErrorValue val = PS_SUCCESS;
 684         const gchar *body;
 685
 686         body = msg;
 687         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 688             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 689                 val = pop3_ok(pop3_session, msg);
 690                 if (val != PS_SUCCESS) {
 691                         if (val != PS_NOTSUPPORTED) {
 692                                 pop3_session->state = POP3_ERROR;
 693                                 return -1;
 694                         }
 695                 }
 696
 697                 if (*body == '+' || *body == '-')
 698                         body++;
 699                 while (isalpha(*body))
 700                         body++;
 701                 while (isspace(*body))
 702                         body++;
 703         }
 704
 705         switch (pop3_session->state) {
 706         case POP3_READY:
 707         case POP3_GREETING:
 708                 pop3_greeting_recv(pop3_session, body);
 709 #if USE_OPENSSL
 710                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 711                         pop3_stls_send(pop3_session);
 712                 else
 713 #endif
 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 #if USE_OPENSSL
 720         case POP3_STLS:
 721                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 722                         return -1;
 723                 if (pop3_session->ac_prefs->protocol == A_APOP)
 724                         pop3_getauth_apop_send(pop3_session);
 725                 else
 726                         pop3_getauth_user_send(pop3_session);
 727                 break;
 728 #endif
 729         case POP3_GETAUTH_USER:
 730                 pop3_getauth_pass_send(pop3_session);
 731                 break;
 732         case POP3_GETAUTH_PASS:
 733         case POP3_GETAUTH_APOP:
 734                 pop3_getrange_stat_send(pop3_session);
 735                 break;
 736         case POP3_GETRANGE_STAT:
 737                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 738                         return -1;
 739                 if (pop3_session->count > 0)
 740                         pop3_getrange_uidl_send(pop3_session);
 741                 else
 742                         pop3_logout_send(pop3_session);
 743                 break;
 744         case POP3_GETRANGE_LAST:
 745                 if (val == PS_NOTSUPPORTED)
 746                         pop3_session->error_val = PS_SUCCESS;
 747                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 748                         return -1;
 749                 if (pop3_session->cur_msg > 0)
 750                         pop3_getsize_list_send(pop3_session);
 751                 else
 752                         pop3_logout_send(pop3_session);
 753                 break;
 754         case POP3_GETRANGE_UIDL:
 755                 if (val == PS_NOTSUPPORTED) {
 756                         pop3_session->error_val = PS_SUCCESS;
 757                         pop3_getrange_last_send(pop3_session);
 758                 } else {
 759                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
 760                         return 1;
 761                 }
 762                 break;
 763         case POP3_GETRANGE_UIDL_RECV:
 764                 val = pop3_getrange_uidl_recv(pop3_session, body);
 765                 if (val == PS_CONTINUE)
 766                         return 1;
 767                 else if (val == PS_SUCCESS) {
 768                         if (pop3_session->new_msg_exist)
 769                                 pop3_getsize_list_send(pop3_session);
 770                         else
 771                                 pop3_logout_send(pop3_session);
 772                 } else
 773                         return -1;
 774                 break;
 775         case POP3_GETSIZE_LIST:
 776                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
 777                 return 1;
 778         case POP3_GETSIZE_LIST_RECV:
 779                 val = pop3_getsize_list_recv(pop3_session, body);
 780                 if (val == PS_CONTINUE)
 781                         return 1;
 782                 else if (val == PS_SUCCESS) {
 783                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 784                                 return -1;
 785                 } else
 786                         return -1;
 787                 break;
 788         case POP3_RETR:
 789                 pop3_session->state = POP3_RETR_RECV;
 790                 session_recv_data
 791                         (session,
 792                          pop3_session->msg[pop3_session->cur_msg].size, TRUE);
 793                 break;
 794         case POP3_DELETE:
 795                 pop3_delete_recv(pop3_session);
 796                 if (pop3_session->cur_msg == pop3_session->count)
 797                         pop3_logout_send(pop3_session);
 798                 else {
 799                         pop3_session->cur_msg++;
 800                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 801                                 return -1;
 802                 }
 803                 break;
 804         case POP3_LOGOUT:
 805                 session_disconnect(session);
 806                 break;
 807         case POP3_ERROR:
 808         default:
 809                 return -1;
 810         }
 811
 812         return 0;
 813 }
 814
 815 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
 816                                             guint len)
 817 {
 818         Pop3Session *pop3_session = POP3_SESSION(session);
 819
 820         if (len == 0)
 821                 return -1;
 822
 823         if (pop3_retr_recv(pop3_session, data, len) < 0)
 824                 return -1;
 825
 826         if (pop3_session->ac_prefs->rmmail &&
 827             pop3_session->ac_prefs->msg_leave_time == 0 &&
 828             pop3_session->msg[pop3_session->cur_msg].recv_time
 829             != RECV_TIME_KEEP)
 830                 pop3_delete_send(pop3_session);
 831         else if (pop3_session->cur_msg == pop3_session->count)
 832                 pop3_logout_send(pop3_session);
 833         else {
 834                 pop3_session->cur_msg++;
 835                 if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 836                         return -1;
 837         }
 838
 839         return 0;
 840 }