src/pop.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2004 Hiroyuki Yamamoto
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #include <glib.h>
  25 #include <glib/gi18n.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <stdarg.h>
  29 #include <ctype.h>
  30 #include <unistd.h>
  31 #include <time.h>
  32 #include <errno.h>
  33
  34 #include "pop.h"
  35 #include "md5.h"
  36 #include "prefs_account.h"
  37 #include "utils.h"
  38 #include "recv.h"
  39 #include "partial_download.h"
  40 #include "log.h"
  41 #include "hooks.h"
  42
  43 static gint pop3_greeting_recv          (Pop3Session *session,
  44                                          const gchar *msg);
  45 static gint pop3_getauth_user_send      (Pop3Session *session);
  46 static gint pop3_getauth_pass_send      (Pop3Session *session);
  47 static gint pop3_getauth_apop_send      (Pop3Session *session);
  48 #if USE_OPENSSL
  49 static gint pop3_stls_send              (Pop3Session *session);
  50 static gint pop3_stls_recv              (Pop3Session *session);
  51 #endif
  52 static gint pop3_getrange_stat_send     (Pop3Session *session);
  53 static gint pop3_getrange_stat_recv     (Pop3Session *session,
  54                                          const gchar *msg);
  55 static gint pop3_getrange_last_send     (Pop3Session *session);
  56 static gint pop3_getrange_last_recv     (Pop3Session *session,
  57                                          const gchar *msg);
  58 static gint pop3_getrange_uidl_send     (Pop3Session *session);
  59 static gint pop3_getrange_uidl_recv     (Pop3Session *session,
  60                                          const gchar *data,
  61                                          guint        len);
  62 static gint pop3_getsize_list_send      (Pop3Session *session);
  63 static gint pop3_getsize_list_recv      (Pop3Session *session,
  64                                          const gchar *data,
  65                                          guint        len);
  66 static gint pop3_retr_send              (Pop3Session *session);
  67 static gint pop3_retr_recv              (Pop3Session *session,
  68                                          const gchar *data,
  69                                          guint        len);
  70 static gint pop3_delete_send            (Pop3Session *session);
  71 static gint pop3_delete_recv            (Pop3Session *session);
  72 static gint pop3_logout_send            (Pop3Session *session);
  73
  74 static void pop3_gen_send               (Pop3Session    *session,
  75                                          const gchar    *format, ...);
  76
  77 static void pop3_session_destroy        (Session        *session);
  78
  79 static gint pop3_write_msg_to_file      (const gchar    *file,
  80                                          const gchar    *data,
  81                                          guint           len,
  82                                          const gchar    *prefix);
  83
  84 static Pop3State pop3_lookup_next       (Pop3Session    *session);
  85 static Pop3ErrorValue pop3_ok           (Pop3Session    *session,
  86                                          const gchar    *msg);
  87
  88 static gint pop3_session_recv_msg               (Session        *session,
  89                                                  const gchar    *msg);
  90 static gint pop3_session_recv_data_finished     (Session        *session,
  91                                                  guchar         *data,
  92                                                  guint           len);
  93
  94 static gint pop3_greeting_recv(Pop3Session *session, const gchar *msg)
  95 {
  96         session->state = POP3_GREETING;
  97
  98         session->greeting = g_strdup(msg);
  99         return PS_SUCCESS;
 100 }
 101
 102 #if USE_OPENSSL
 103 static gint pop3_stls_send(Pop3Session *session)
 104 {
 105         session->state = POP3_STLS;
 106         pop3_gen_send(session, "STLS");
 107         return PS_SUCCESS;
 108 }
 109
 110 static gint pop3_stls_recv(Pop3Session *session)
 111 {
 112         if (session_start_tls(SESSION(session)) < 0) {
 113                 session->error_val = PS_SOCKET;
 114                 return -1;
 115         }
 116         return PS_SUCCESS;
 117 }
 118 #endif /* USE_OPENSSL */
 119
 120 static gint pop3_getauth_user_send(Pop3Session *session)
 121 {
 122         g_return_val_if_fail(session->user != NULL, -1);
 123
 124         session->state = POP3_GETAUTH_USER;
 125         pop3_gen_send(session, "USER %s", session->user);
 126         return PS_SUCCESS;
 127 }
 128
 129 static gint pop3_getauth_pass_send(Pop3Session *session)
 130 {
 131         g_return_val_if_fail(session->pass != NULL, -1);
 132
 133         session->state = POP3_GETAUTH_PASS;
 134         pop3_gen_send(session, "PASS %s", session->pass);
 135         return PS_SUCCESS;
 136 }
 137
 138 static gint pop3_getauth_apop_send(Pop3Session *session)
 139 {
 140         gchar *start, *end;
 141         gchar *apop_str;
 142         gchar md5sum[33];
 143
 144         g_return_val_if_fail(session->user != NULL, -1);
 145         g_return_val_if_fail(session->pass != NULL, -1);
 146
 147         session->state = POP3_GETAUTH_APOP;
 148
 149         if ((start = strchr(session->greeting, '<')) == NULL) {
 150                 log_error(_("Required APOP timestamp not found "
 151                             "in greeting\n"));
 152                 session->error_val = PS_PROTOCOL;
 153                 return -1;
 154         }
 155
 156         if ((end = strchr(start, '>')) == NULL || end == start + 1) {
 157                 log_error(_("Timestamp syntax error in greeting\n"));
 158                 session->error_val = PS_PROTOCOL;
 159                 return -1;
 160         }
 161
 162         *(end + 1) = '\0';
 163
 164         apop_str = g_strconcat(start, session->pass, NULL);
 165         md5_hex_digest(md5sum, apop_str);
 166         g_free(apop_str);
 167
 168         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 169
 170         return PS_SUCCESS;
 171 }
 172
 173 static gint pop3_getrange_stat_send(Pop3Session *session)
 174 {
 175         session->state = POP3_GETRANGE_STAT;
 176         pop3_gen_send(session, "STAT");
 177         return PS_SUCCESS;
 178 }
 179
 180 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 181 {
 182         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 183                 log_error(_("POP3 protocol error\n"));
 184                 session->error_val = PS_PROTOCOL;
 185                 return -1;
 186         } else {
 187                 if (session->count == 0) {
 188                         session->uidl_is_valid = TRUE;
 189                 } else {
 190                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 191                         session->cur_msg = 1;
 192                 }
 193         }
 194
 195         return PS_SUCCESS;
 196 }
 197
 198 static gint pop3_getrange_last_send(Pop3Session *session)
 199 {
 200         session->state = POP3_GETRANGE_LAST;
 201         pop3_gen_send(session, "LAST");
 202         return PS_SUCCESS;
 203 }
 204
 205 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 206 {
 207         gint last;
 208
 209         if (sscanf(msg, "%d", &last) == 0) {
 210                 log_warning(_("POP3 protocol error\n"));
 211                 session->error_val = PS_PROTOCOL;
 212                 return -1;
 213         } else {
 214                 if (session->count > last) {
 215                         session->new_msg_exist = TRUE;
 216                         session->cur_msg = last + 1;
 217                 } else
 218                         session->cur_msg = 0;
 219         }
 220
 221         return PS_SUCCESS;
 222 }
 223
 224 static gint pop3_getrange_uidl_send(Pop3Session *session)
 225 {
 226         session->state = POP3_GETRANGE_UIDL;
 227         pop3_gen_send(session, "UIDL");
 228         return PS_SUCCESS;
 229 }
 230
 231 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *data,
 232                                     guint len)
 233 {
 234         gchar id[IDLEN + 1];
 235         gchar buf[POPBUFSIZE];
 236         gint buf_len;
 237         gint num;
 238         time_t recv_time;
 239         gint partial_recv;
 240         const gchar *p = data;
 241         const gchar *lastp = data + len;
 242         const gchar *newline;
 243
 244         while (p < lastp) {
 245                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 246                         return -1;
 247                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 248                 memcpy(buf, p, buf_len);
 249                 buf[buf_len] = '\0';
 250
 251                 p = newline + 1;
 252                 if (p < lastp && *p == '\n') p++;
 253
 254                 if (sscanf(buf, "%d %" Xstr(IDLEN) "s", &num, id) != 2 ||
 255                     num <= 0 || num > session->count) {
 256                         log_warning(_("invalid UIDL response: %s\n"), buf);
 257                         continue;
 258                 }
 259
 260                 session->msg[num].uidl = g_strdup(id);
 261
 262                 recv_time = (time_t)g_hash_table_lookup(
 263                                         session->uidl_table, id);
 264                 session->msg[num].recv_time = recv_time;
 265
 266                 partial_recv = (gint)g_hash_table_lookup(
 267                                         session->partial_recv_table, id);
 268
 269                 if ((!session->ac_prefs->getall && recv_time != RECV_TIME_NONE)
 270                 || partial_recv != POP3_TOTALLY_RECEIVED) {
 271                         session->msg[num].received =
 272                                 (partial_recv != POP3_MUST_COMPLETE_RECV);
 273                         session->msg[num].partial_recv = partial_recv;
 274
 275                 }
 276                 if (!session->new_msg_exist &&
 277                     (session->ac_prefs->getall || recv_time == RECV_TIME_NONE ||
 278                      session->ac_prefs->rmmail)) {
 279                         session->cur_msg = num;
 280                         session->new_msg_exist = TRUE;
 281                 }
 282         }
 283
 284         session->uidl_is_valid = TRUE;
 285         return PS_SUCCESS;
 286 }
 287
 288 static gint pop3_getsize_list_send(Pop3Session *session)
 289 {
 290         session->state = POP3_GETSIZE_LIST;
 291         pop3_gen_send(session, "LIST");
 292         return PS_SUCCESS;
 293 }
 294
 295 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 296                                    guint len)
 297 {
 298         gchar buf[POPBUFSIZE];
 299         gint buf_len;
 300         guint num, size;
 301         const gchar *p = data;
 302         const gchar *lastp = data + len;
 303         const gchar *newline;
 304
 305         while (p < lastp) {
 306                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 307                         return -1;
 308                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 309                 memcpy(buf, p, buf_len);
 310                 buf[buf_len] = '\0';
 311
 312                 p = newline + 1;
 313                 if (p < lastp && *p == '\n') p++;
 314
 315                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 316                         session->error_val = PS_PROTOCOL;
 317                         return -1;
 318                 }
 319
 320                 if (num > 0 && num <= session->count)
 321                         session->msg[num].size = size;
 322                 if (num > 0 && num < session->cur_msg)
 323                         session->cur_total_bytes += size;
 324         }
 325
 326         return PS_SUCCESS;
 327 }
 328
 329 static gint pop3_retr_send(Pop3Session *session)
 330 {
 331         session->state = POP3_RETR;
 332         pop3_gen_send(session, "RETR %d", session->cur_msg);
 333         return PS_SUCCESS;
 334 }
 335
 336 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 337 {
 338         gchar *file;
 339         gint drop_ok;
 340         MailReceiveData mail_receive_data;
 341
 342         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 343          * because some plugins may think that it has a C string. */
 344         mail_receive_data.session  = session;
 345         mail_receive_data.data     = g_new0(gchar, len + 1);
 346         mail_receive_data.data_len = len;
 347         memcpy(mail_receive_data.data, data, len);
 348
 349         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 350
 351         file = get_tmp_file();
 352         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 353                                    mail_receive_data.data_len, NULL) < 0) {
 354                 g_free(file);
 355                 g_free(mail_receive_data.data);
 356                 session->error_val = PS_IOERR;
 357                 return -1;
 358         }
 359         g_free(mail_receive_data.data);
 360
 361         if (session->msg[session->cur_msg].partial_recv
 362             == POP3_MUST_COMPLETE_RECV) {
 363                 gchar *old_file = partial_get_filename(
 364                                 session->ac_prefs->recv_server,
 365                                 session->ac_prefs->userid,
 366                                 session->msg[session->cur_msg].uidl);
 367
 368                 if (old_file) {
 369                         partial_delete_old(old_file);
 370                         g_free(old_file);
 371                 }
 372         }
 373
 374         /* drop_ok: 0: success 1: don't receive -1: error */
 375         drop_ok = session->drop_message(session, file);
 376
 377         g_free(file);
 378         if (drop_ok < 0) {
 379                 session->error_val = PS_IOERR;
 380                 return -1;
 381         }
 382
 383         session->cur_total_bytes += session->msg[session->cur_msg].size;
 384         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 385         session->cur_total_num++;
 386
 387         session->msg[session->cur_msg].received = TRUE;
 388         session->msg[session->cur_msg].partial_recv = POP3_TOTALLY_RECEIVED;
 389
 390         session->msg[session->cur_msg].recv_time =
 391                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 392
 393         return PS_SUCCESS;
 394 }
 395
 396 static gint pop3_top_send(Pop3Session *session, gint max_size)
 397 {
 398         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 399         session->state = POP3_TOP;
 400         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 401         return PS_SUCCESS;
 402 }
 403
 404 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 405 {
 406         gchar *file;
 407         gint drop_ok;
 408         MailReceiveData mail_receive_data;
 409         gchar *partial_notice = NULL;
 410
 411         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 412          * because some plugins may think that it has a C string. */
 413         mail_receive_data.session  = session;
 414         mail_receive_data.data     = g_new0(gchar, len + 1);
 415         mail_receive_data.data_len = len;
 416         memcpy(mail_receive_data.data, data, len);
 417
 418         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 419
 420         partial_notice = g_strdup_printf("SC-Marked-For-Download: 0\n"
 421                                          "SC-Partially-Retrieved: %s\n"
 422                                          "SC-Account-Server: %s\n"
 423                                          "SC-Account-Login: %s\n"
 424                                          "SC-Message-Size: %d",
 425                                          session->msg[session->cur_msg].uidl,
 426                                          session->ac_prefs->recv_server,
 427                                          session->ac_prefs->userid,
 428                                          session->msg[session->cur_msg].size);
 429         file = get_tmp_file();
 430         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 431                                    mail_receive_data.data_len,
 432                                    partial_notice) < 0) {
 433                 g_free(file);
 434                 g_free(mail_receive_data.data);
 435                 session->error_val = PS_IOERR;
 436                 g_free(partial_notice);
 437                 return -1;
 438         }
 439         g_free(mail_receive_data.data);
 440         g_free(partial_notice);
 441
 442         /* drop_ok: 0: success 1: don't receive -1: error */
 443         drop_ok = session->drop_message(session, file);
 444         g_free(file);
 445         if (drop_ok < 0) {
 446                 session->error_val = PS_IOERR;
 447                 return -1;
 448         }
 449
 450         session->cur_total_bytes += session->msg[session->cur_msg].size;
 451         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 452         session->cur_total_num++;
 453
 454         session->msg[session->cur_msg].received = TRUE;
 455         session->msg[session->cur_msg].partial_recv = POP3_PARTIALLY_RECEIVED;
 456         session->msg[session->cur_msg].recv_time =
 457                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 458
 459         return PS_SUCCESS;
 460 }
 461
 462 static gint pop3_delete_send(Pop3Session *session)
 463 {
 464         session->state = POP3_DELETE;
 465         pop3_gen_send(session, "DELE %d", session->cur_msg);
 466         return PS_SUCCESS;
 467 }
 468
 469 static gint pop3_delete_recv(Pop3Session *session)
 470 {
 471         session->msg[session->cur_msg].deleted = TRUE;
 472         return PS_SUCCESS;
 473 }
 474
 475 static gint pop3_logout_send(Pop3Session *session)
 476 {
 477         session->state = POP3_LOGOUT;
 478         pop3_gen_send(session, "QUIT");
 479         return PS_SUCCESS;
 480 }
 481
 482 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 483 {
 484         gchar buf[POPBUFSIZE + 1];
 485         va_list args;
 486
 487         va_start(args, format);
 488         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 489         va_end(args);
 490
 491         if (!g_ascii_strncasecmp(buf, "PASS ", 5))
 492                 log_print("POP3> PASS ********\n");
 493         else
 494                 log_print("POP3> %s\n", buf);
 495
 496         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 497 }
 498
 499 Session *pop3_session_new(PrefsAccount *account)
 500 {
 501         Pop3Session *session;
 502
 503         g_return_val_if_fail(account != NULL, NULL);
 504
 505         session = g_new0(Pop3Session, 1);
 506
 507         session_init(SESSION(session));
 508
 509         SESSION(session)->type = SESSION_POP3;
 510
 511         SESSION(session)->recv_msg = pop3_session_recv_msg;
 512         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 513         SESSION(session)->send_data_finished = NULL;
 514
 515         SESSION(session)->destroy = pop3_session_destroy;
 516
 517         session->state = POP3_READY;
 518         session->ac_prefs = account;
 519         session->pop_before_smtp = FALSE;
 520         pop3_get_uidl_table(account, session);
 521         session->current_time = time(NULL);
 522         session->error_val = PS_SUCCESS;
 523         session->error_msg = NULL;
 524
 525         return SESSION(session);
 526 }
 527
 528 static void pop3_session_destroy(Session *session)
 529 {
 530         Pop3Session *pop3_session = POP3_SESSION(session);
 531         gint n;
 532
 533         g_return_if_fail(session != NULL);
 534
 535         for (n = 1; n <= pop3_session->count; n++)
 536                 g_free(pop3_session->msg[n].uidl);
 537         g_free(pop3_session->msg);
 538
 539         if (pop3_session->uidl_table) {
 540                 hash_free_strings(pop3_session->uidl_table);
 541                 g_hash_table_destroy(pop3_session->uidl_table);
 542         }
 543
 544         if (pop3_session->partial_recv_table) {
 545                 hash_free_strings(pop3_session->partial_recv_table);
 546                 g_hash_table_destroy(pop3_session->partial_recv_table);
 547         }
 548
 549         g_free(pop3_session->greeting);
 550         g_free(pop3_session->user);
 551         g_free(pop3_session->pass);
 552         g_free(pop3_session->error_msg);
 553 }
 554
 555 void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session)
 556 {
 557         GHashTable *table;
 558         GHashTable *partial_recv_table;
 559         gchar *path;
 560         FILE *fp;
 561         gchar buf[POPBUFSIZE];
 562         gchar uidl[POPBUFSIZE];
 563         time_t recv_time;
 564         time_t now;
 565         gint partial_recv;
 566         gchar *sanitized_uid = g_strdup(ac_prefs->userid);
 567
 568         subst_for_filename(sanitized_uid);
 569
 570         table = g_hash_table_new(g_str_hash, g_str_equal);
 571         partial_recv_table = g_hash_table_new(g_str_hash, g_str_equal);
 572
 573         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 574                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 575                            "-", sanitized_uid, NULL);
 576
 577         g_free(sanitized_uid);
 578         if ((fp = g_fopen(path, "rb")) == NULL) {
 579                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 580                 g_free(path);
 581                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 582                                    "uidl-", ac_prefs->recv_server,
 583                                    "-", ac_prefs->userid, NULL);
 584                 if ((fp = g_fopen(path, "rb")) == NULL) {
 585                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 586                         g_free(path);
 587                         session->uidl_table = table;
 588                         session->partial_recv_table = partial_recv_table;
 589                         return;
 590                 }
 591         }
 592         g_free(path);
 593
 594         now = time(NULL);
 595
 596         while (fgets(buf, sizeof(buf), fp) != NULL) {
 597                 gchar tmp[POPBUFSIZE];
 598                 strretchomp(buf);
 599                 recv_time = RECV_TIME_NONE;
 600                 partial_recv = POP3_TOTALLY_RECEIVED;
 601
 602                 if (sscanf(buf, "%s\t%ld\t%s", uidl, &recv_time, tmp) < 3) {
 603                         if (sscanf(buf, "%s\t%ld", uidl, &recv_time) != 2) {
 604                                 if (sscanf(buf, "%s", uidl) != 1)
 605                                         continue;
 606                                 else {
 607                                         recv_time = now;
 608                                         strcpy(tmp, "0");
 609                                 }
 610                         } else {
 611                                 strcpy(tmp, "0");
 612                         }
 613                 }
 614
 615                 if (recv_time == RECV_TIME_NONE)
 616                         recv_time = RECV_TIME_RECEIVED;
 617                 g_hash_table_insert(table, g_strdup(uidl),
 618                                     GINT_TO_POINTER(recv_time));
 619                 if (strlen(tmp) == 1)
 620                         partial_recv = atoi(tmp); /* totally received ?*/
 621                 else
 622                         partial_recv = POP3_MUST_COMPLETE_RECV;
 623
 624                 g_hash_table_insert(partial_recv_table, g_strdup(uidl),
 625                                     GINT_TO_POINTER(partial_recv));
 626         }
 627
 628         fclose(fp);
 629         session->uidl_table = table;
 630         session->partial_recv_table = partial_recv_table;
 631
 632         return;
 633 }
 634
 635 gint pop3_write_uidl_list(Pop3Session *session)
 636 {
 637         gchar *path;
 638         FILE *fp;
 639         Pop3MsgInfo *msg;
 640         gint n;
 641         gchar *sanitized_uid = g_strdup(session->ac_prefs->userid);
 642
 643         subst_for_filename(sanitized_uid);
 644
 645
 646         if (!session->uidl_is_valid) return 0;
 647
 648         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 649                            "uidl", G_DIR_SEPARATOR_S,
 650                            session->ac_prefs->recv_server,
 651                            "-", sanitized_uid, NULL);
 652
 653         g_free(sanitized_uid);
 654
 655         if ((fp = g_fopen(path, "wb")) == NULL) {
 656                 FILE_OP_ERROR(path, "fopen");
 657                 g_free(path);
 658                 return -1;
 659         }
 660
 661         for (n = 1; n <= session->count; n++) {
 662                 msg = &session->msg[n];
 663                 if (msg->uidl && msg->received &&
 664                     (!msg->deleted || session->state != POP3_DONE))
 665                         fprintf(fp, "%s\t%ld\t%d\n",
 666                                 msg->uidl, msg->recv_time, msg->partial_recv);
 667         }
 668
 669         if (fclose(fp) == EOF) FILE_OP_ERROR(path, "fclose");
 670         g_free(path);
 671
 672         return 0;
 673 }
 674
 675 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 676                                    guint len, const gchar *prefix)
 677 {
 678         FILE *fp;
 679         const gchar *prev, *cur;
 680
 681         g_return_val_if_fail(file != NULL, -1);
 682
 683         if ((fp = g_fopen(file, "wb")) == NULL) {
 684                 FILE_OP_ERROR(file, "fopen");
 685                 return -1;
 686         }
 687
 688         if (change_file_mode_rw(fp, file) < 0)
 689                 FILE_OP_ERROR(file, "chmod");
 690
 691         if (prefix != NULL) {
 692                 fprintf(fp, "%s", prefix);
 693                 fprintf(fp, "\n");
 694         }
 695
 696         /* +------------------+----------------+--------------------------+ *
 697          * ^data              ^prev            ^cur             data+len-1^ */
 698
 699         prev = data;
 700         while ((cur = (gchar *)my_memmem(prev, len - (prev - data), "\r\n", 2))
 701                != NULL) {
 702                 if ((cur > prev && fwrite(prev, 1, cur - prev, fp) < 1) ||
 703                     fputc('\n', fp) == EOF) {
 704                         FILE_OP_ERROR(file, "fwrite");
 705                         g_warning("can't write to file: %s\n", file);
 706                         fclose(fp);
 707                         g_unlink(file);
 708                         return -1;
 709                 }
 710
 711                 if (cur == data + len - 1) {
 712                         prev = cur + 1;
 713                         break;
 714                 }
 715
 716                 if (*(cur + 1) == '\n')
 717                         prev = cur + 2;
 718                 else
 719                         prev = cur + 1;
 720
 721                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 722                         prev++;
 723
 724                 if (prev - data >= len)
 725                         break;
 726         }
 727
 728         if (prev - data < len &&
 729             fwrite(prev, 1, len - (prev - data), fp) < 1) {
 730                 FILE_OP_ERROR(file, "fwrite");
 731                 g_warning("can't write to file: %s\n", file);
 732                 fclose(fp);
 733                 g_unlink(file);
 734                 return -1;
 735         }
 736         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 737                 if (fputc('\n', fp) == EOF) {
 738                         FILE_OP_ERROR(file, "fputc");
 739                         g_warning("can't write to file: %s\n", file);
 740                         fclose(fp);
 741                         g_unlink(file);
 742                         return -1;
 743                 }
 744         }
 745
 746         if (fclose(fp) == EOF) {
 747                 FILE_OP_ERROR(file, "fclose");
 748                 g_unlink(file);
 749                 return -1;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static Pop3State pop3_lookup_next(Pop3Session *session)
 756 {
 757         Pop3MsgInfo *msg;
 758         PrefsAccount *ac = session->ac_prefs;
 759         gint size;
 760         gboolean size_limit_over;
 761
 762         for (;;) {
 763                 msg = &session->msg[session->cur_msg];
 764                 size = msg->size;
 765                 size_limit_over =
 766                     (ac->enable_size_limit &&
 767                      ac->size_limit > 0 &&
 768                      size > ac->size_limit * 1024);
 769
 770                 if (ac->rmmail &&
 771                     msg->recv_time != RECV_TIME_NONE &&
 772                     msg->recv_time != RECV_TIME_KEEP &&
 773                     msg->partial_recv == POP3_TOTALLY_RECEIVED &&
 774                     session->current_time - msg->recv_time >=
 775                     ac->msg_leave_time * 24 * 60 * 60) {
 776                         log_message
 777                                 (_("POP3: Deleting expired message "
 778                                    "%d\n"), session->cur_msg);
 779                         pop3_delete_send(session);
 780                         return POP3_DELETE;
 781                 }
 782
 783                 if (size_limit_over) {
 784                         if (!msg->received && msg->partial_recv !=
 785                             POP3_MUST_COMPLETE_RECV) {
 786                                 pop3_top_send(session, ac->size_limit);
 787                                 return POP3_TOP;
 788                         } else if (msg->partial_recv == POP3_MUST_COMPLETE_RECV)
 789                                 break;
 790
 791                         log_message
 792                                 (_("POP3: Skipping message %d (%d bytes)\n"),
 793                                    session->cur_msg, size);
 794                 }
 795
 796                 if (size == 0 || msg->received || size_limit_over) {
 797                         session->cur_total_bytes += size;
 798                         if (session->cur_msg == session->count) {
 799                                 pop3_logout_send(session);
 800                                 return POP3_LOGOUT;
 801                         } else
 802                                 session->cur_msg++;
 803                 } else
 804                         break;
 805         }
 806
 807         pop3_retr_send(session);
 808         return POP3_RETR;
 809 }
 810
 811 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 812 {
 813         Pop3ErrorValue ok;
 814
 815         log_print("POP3< %s\n", msg);
 816
 817         if (!strncmp(msg, "+OK", 3))
 818                 ok = PS_SUCCESS;
 819         else if (!strncmp(msg, "-ERR", 4)) {
 820                 if (strstr(msg + 4, "lock") ||
 821                     strstr(msg + 4, "Lock") ||
 822                     strstr(msg + 4, "LOCK") ||
 823                     strstr(msg + 4, "wait")) {
 824                         log_error(_("mailbox is locked\n"));
 825                         ok = PS_LOCKBUSY;
 826                 } else if (strcasestr(msg + 4, "timeout")) {
 827                         log_error(_("Session timeout\n"));
 828                         ok = PS_ERROR;
 829                 } else {
 830                         switch (session->state) {
 831 #if USE_OPENSSL
 832                         case POP3_STLS:
 833                                 log_error(_("can't start TLS session\n"));
 834                                 ok = PS_ERROR;
 835                                 break;
 836 #endif
 837                         case POP3_GETAUTH_USER:
 838                         case POP3_GETAUTH_PASS:
 839                         case POP3_GETAUTH_APOP:
 840                                 log_error(_("error occurred on authentication\n"));
 841                                 ok = PS_AUTHFAIL;
 842                                 break;
 843                         case POP3_GETRANGE_LAST:
 844                         case POP3_GETRANGE_UIDL:
 845                         case POP3_TOP:
 846                                 log_warning(_("command not supported\n"));
 847                                 ok = PS_NOTSUPPORTED;
 848                                 break;
 849
 850                         default:
 851                                 log_error(_("error occurred on POP3 session\n"));
 852                                 ok = PS_ERROR;
 853                         }
 854                 }
 855
 856                 g_free(session->error_msg);
 857                 session->error_msg = g_strdup(msg);
 858                 fprintf(stderr, "POP3: %s\n", msg);
 859         } else
 860                 ok = PS_PROTOCOL;
 861
 862         session->error_val = ok;
 863         return ok;
 864 }
 865
 866 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 867 {
 868         Pop3Session *pop3_session = POP3_SESSION(session);
 869         Pop3ErrorValue val = PS_SUCCESS;
 870         const gchar *body;
 871
 872         body = msg;
 873         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 874             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 875                 val = pop3_ok(pop3_session, msg);
 876                 if (val != PS_SUCCESS) {
 877                         if (val != PS_NOTSUPPORTED) {
 878                                 pop3_session->state = POP3_ERROR;
 879                                 return -1;
 880                         }
 881                 }
 882
 883                 if (*body == '+' || *body == '-')
 884                         body++;
 885                 while (g_ascii_isalpha(*body))
 886                         body++;
 887                 while (g_ascii_isspace(*body))
 888                         body++;
 889         }
 890
 891         switch (pop3_session->state) {
 892         case POP3_READY:
 893         case POP3_GREETING:
 894                 pop3_greeting_recv(pop3_session, body);
 895 #if USE_OPENSSL
 896                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 897                         pop3_stls_send(pop3_session);
 898                 else
 899 #endif
 900                 if (pop3_session->ac_prefs->use_apop_auth)
 901                         pop3_getauth_apop_send(pop3_session);
 902                 else
 903                         pop3_getauth_user_send(pop3_session);
 904                 break;
 905 #if USE_OPENSSL
 906         case POP3_STLS:
 907                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 908                         return -1;
 909                 if (pop3_session->ac_prefs->use_apop_auth)
 910                         pop3_getauth_apop_send(pop3_session);
 911                 else
 912                         pop3_getauth_user_send(pop3_session);
 913                 break;
 914 #endif
 915         case POP3_GETAUTH_USER:
 916                 pop3_getauth_pass_send(pop3_session);
 917                 break;
 918         case POP3_GETAUTH_PASS:
 919         case POP3_GETAUTH_APOP:
 920                 if (!pop3_session->pop_before_smtp)
 921                         pop3_getrange_stat_send(pop3_session);
 922                 else
 923                         pop3_logout_send(pop3_session);
 924                 break;
 925         case POP3_GETRANGE_STAT:
 926                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 927                         return -1;
 928                 if (pop3_session->count > 0)
 929                         pop3_getrange_uidl_send(pop3_session);
 930                 else
 931                         pop3_logout_send(pop3_session);
 932                 break;
 933         case POP3_GETRANGE_LAST:
 934                 if (val == PS_NOTSUPPORTED)
 935                         pop3_session->error_val = PS_SUCCESS;
 936                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 937                         return -1;
 938                 if (pop3_session->cur_msg > 0)
 939                         pop3_getsize_list_send(pop3_session);
 940                 else
 941                         pop3_logout_send(pop3_session);
 942                 break;
 943         case POP3_GETRANGE_UIDL:
 944                 if (val == PS_NOTSUPPORTED) {
 945                         pop3_session->error_val = PS_SUCCESS;
 946                         pop3_getrange_last_send(pop3_session);
 947                 } else {
 948                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
 949                         session_recv_data(session, 0, ".\r\n");
 950                 }
 951                 break;
 952         case POP3_GETSIZE_LIST:
 953                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
 954                 session_recv_data(session, 0, ".\r\n");
 955                 break;
 956         case POP3_RETR:
 957                 pop3_session->state = POP3_RETR_RECV;
 958                 session_recv_data(session, 0, ".\r\n");
 959                 break;
 960         case POP3_TOP:
 961                 if (val == PS_NOTSUPPORTED) {
 962                         pop3_session->error_val = PS_SUCCESS;
 963                 } else {
 964                         pop3_session->state = POP3_TOP_RECV;
 965                         session_recv_data(session, 0, ".\r\n");
 966                 }
 967                 break;
 968         case POP3_DELETE:
 969                 pop3_delete_recv(pop3_session);
 970                 if (pop3_session->cur_msg == pop3_session->count)
 971                         pop3_logout_send(pop3_session);
 972                 else {
 973                         pop3_session->cur_msg++;
 974                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
 975                                 return -1;
 976                 }
 977                 break;
 978         case POP3_LOGOUT:
 979                 pop3_session->state = POP3_DONE;
 980                 session_disconnect(session);
 981                 break;
 982         case POP3_ERROR:
 983         default:
 984                 return -1;
 985         }
 986
 987         return 0;
 988 }
 989
 990 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
 991                                             guint len)
 992 {
 993         Pop3Session *pop3_session = POP3_SESSION(session);
 994         Pop3ErrorValue val = PS_SUCCESS;
 995
 996         switch (pop3_session->state) {
 997         case POP3_GETRANGE_UIDL_RECV:
 998                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
 999                 if (val == PS_SUCCESS) {
1000                         if (pop3_session->new_msg_exist)
1001                                 pop3_getsize_list_send(pop3_session);
1002                         else
1003                                 pop3_logout_send(pop3_session);
1004                 } else
1005                         return -1;
1006                 break;
1007         case POP3_GETSIZE_LIST_RECV:
1008                 val = pop3_getsize_list_recv(pop3_session, data, len);
1009                 if (val == PS_SUCCESS) {
1010                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1011                                 return -1;
1012                 } else
1013                         return -1;
1014                 break;
1015         case POP3_RETR_RECV:
1016                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1017                         return -1;
1018
1019                 if (pop3_session->ac_prefs->rmmail &&
1020                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1021                     pop3_session->msg[pop3_session->cur_msg].recv_time
1022                     != RECV_TIME_KEEP)
1023                         pop3_delete_send(pop3_session);
1024                 else if (pop3_session->cur_msg == pop3_session->count)
1025                         pop3_logout_send(pop3_session);
1026                 else {
1027                         pop3_session->cur_msg++;
1028                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1029                                 return -1;
1030                 }
1031                 break;
1032         case POP3_TOP_RECV:
1033                 if (pop3_top_recv(pop3_session, data, len) < 0)
1034                         return -1;
1035
1036                 if (pop3_session->cur_msg == pop3_session->count)
1037                         pop3_logout_send(pop3_session);
1038                 else {
1039                         pop3_session->cur_msg++;
1040                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1041                                 return -1;
1042                 }
1043                 break;
1044         case POP3_TOP:
1045                 log_warning(_("TOP command unsupported\n"));
1046                 if (pop3_session->cur_msg == pop3_session->count)
1047                         pop3_logout_send(pop3_session);
1048                 else {
1049                         pop3_session->cur_msg++;
1050                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1051                                 return -1;
1052                 }
1053                 break;
1054         case POP3_ERROR:
1055         default:
1056                 return -1;
1057         }
1058
1059         return 0;
1060 }