src/pop.c

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