src/pop.c

   1 /*
   2  * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
   3  * Copyright (C) 1999-2007 Hiroyuki Yamamoto and the Claws Mail team
   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 3 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, see <http://www.gnu.org/licenses/>.
  17  *
  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(LOG_PROTOCOL, _("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(LOG_PROTOCOL, _("Timestamp syntax error in greeting\n"));
 158                 session->error_val = PS_PROTOCOL;
 159                 return -1;
 160         }
 161         *(end + 1) = '\0';
 162
 163         if (!is_ascii_str(start)) {
 164                 log_error(LOG_PROTOCOL, _("Timestamp syntax error in greeting (not ascii)\n"));
 165                 session->error_val = PS_PROTOCOL;
 166                 return -1;
 167         }
 168
 169         apop_str = g_strconcat(start, session->pass, NULL);
 170         md5_hex_digest(md5sum, apop_str);
 171         g_free(apop_str);
 172
 173         pop3_gen_send(session, "APOP %s %s", session->user, md5sum);
 174
 175         return PS_SUCCESS;
 176 }
 177
 178 static gint pop3_getrange_stat_send(Pop3Session *session)
 179 {
 180         session->state = POP3_GETRANGE_STAT;
 181         pop3_gen_send(session, "STAT");
 182         return PS_SUCCESS;
 183 }
 184
 185 static gint pop3_getrange_stat_recv(Pop3Session *session, const gchar *msg)
 186 {
 187         if (sscanf(msg, "%d %d", &session->count, &session->total_bytes) != 2) {
 188                 log_error(LOG_PROTOCOL, _("POP3 protocol error\n"));
 189                 session->error_val = PS_PROTOCOL;
 190                 return -1;
 191         } else {
 192                 if (session->count == 0) {
 193                         session->uidl_is_valid = TRUE;
 194                 } else {
 195                         session->msg = g_new0(Pop3MsgInfo, session->count + 1);
 196                         session->cur_msg = 1;
 197                 }
 198         }
 199
 200         return PS_SUCCESS;
 201 }
 202
 203 static gint pop3_getrange_last_send(Pop3Session *session)
 204 {
 205         session->state = POP3_GETRANGE_LAST;
 206         pop3_gen_send(session, "LAST");
 207         return PS_SUCCESS;
 208 }
 209
 210 static gint pop3_getrange_last_recv(Pop3Session *session, const gchar *msg)
 211 {
 212         gint last;
 213
 214         if (sscanf(msg, "%d", &last) == 0) {
 215                 log_warning(LOG_PROTOCOL, _("POP3 protocol error\n"));
 216                 session->error_val = PS_PROTOCOL;
 217                 return -1;
 218         } else {
 219                 if (session->count > last) {
 220                         session->new_msg_exist = TRUE;
 221                         session->cur_msg = last + 1;
 222                 } else
 223                         session->cur_msg = 0;
 224         }
 225
 226         return PS_SUCCESS;
 227 }
 228
 229 static gint pop3_getrange_uidl_send(Pop3Session *session)
 230 {
 231         session->state = POP3_GETRANGE_UIDL;
 232         pop3_gen_send(session, "UIDL");
 233         return PS_SUCCESS;
 234 }
 235
 236 static gint pop3_getrange_uidl_recv(Pop3Session *session, const gchar *data,
 237                                     guint len)
 238 {
 239         gchar id[IDLEN + 1];
 240         gchar buf[POPBUFSIZE];
 241         gint buf_len;
 242         guint32 num;
 243         time_t recv_time;
 244         gint partial_recv;
 245         const gchar *p = data;
 246         const gchar *lastp = data + len;
 247         const gchar *newline;
 248
 249         while (p < lastp) {
 250                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 251                         return -1;
 252                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 253                 memcpy(buf, p, buf_len);
 254                 buf[buf_len] = '\0';
 255
 256                 p = newline + 1;
 257                 if (p < lastp && *p == '\n') p++;
 258
 259                 if (sscanf(buf, "%d %" Xstr(IDLEN) "s", &num, id) != 2 ||
 260                     num <= 0 || num > session->count) {
 261                         log_warning(LOG_PROTOCOL, _("invalid UIDL response: %s\n"), buf);
 262                         continue;
 263                 }
 264
 265                 session->msg[num].uidl = g_strdup(id);
 266
 267                 recv_time = (time_t)g_hash_table_lookup(
 268                                         session->uidl_table, id);
 269                 session->msg[num].recv_time = recv_time;
 270
 271                 if (recv_time != RECV_TIME_NONE) {
 272                         debug_print("num %d uidl %s: already got it\n", num, id);
 273                 } else {
 274                         debug_print("num %d uidl %s: unknown\n", num, id);
 275                 }
 276
 277                 partial_recv = (gint)g_hash_table_lookup(
 278                                         session->partial_recv_table, id);
 279
 280                 if (recv_time != RECV_TIME_NONE
 281                 || partial_recv != POP3_TOTALLY_RECEIVED) {
 282                         session->msg[num].received =
 283                                 (partial_recv != POP3_MUST_COMPLETE_RECV);
 284                         session->msg[num].partial_recv = partial_recv;
 285                         if (partial_recv == POP3_MUST_COMPLETE_RECV)
 286                                 session->new_msg_exist = TRUE;
 287                 }
 288                 if (!session->new_msg_exist &&
 289                     (recv_time == RECV_TIME_NONE ||
 290                      session->ac_prefs->rmmail)) {
 291                         session->cur_msg = num;
 292                         session->new_msg_exist = TRUE;
 293                 }
 294         }
 295
 296         session->uidl_is_valid = TRUE;
 297         return PS_SUCCESS;
 298 }
 299
 300 static gint pop3_getsize_list_send(Pop3Session *session)
 301 {
 302         session->state = POP3_GETSIZE_LIST;
 303         pop3_gen_send(session, "LIST");
 304         return PS_SUCCESS;
 305 }
 306
 307 static gint pop3_getsize_list_recv(Pop3Session *session, const gchar *data,
 308                                    guint len)
 309 {
 310         gchar buf[POPBUFSIZE];
 311         gint buf_len;
 312         guint num, size;
 313         const gchar *p = data;
 314         const gchar *lastp = data + len;
 315         const gchar *newline;
 316
 317         while (p < lastp) {
 318                 if ((newline = memchr(p, '\r', lastp - p)) == NULL)
 319                         return -1;
 320                 buf_len = MIN(newline - p, sizeof(buf) - 1);
 321                 memcpy(buf, p, buf_len);
 322                 buf[buf_len] = '\0';
 323
 324                 p = newline + 1;
 325                 if (p < lastp && *p == '\n') p++;
 326
 327                 if (sscanf(buf, "%u %u", &num, &size) != 2) {
 328                         session->error_val = PS_PROTOCOL;
 329                         return -1;
 330                 }
 331
 332                 if (num > 0 && num <= session->count)
 333                         session->msg[num].size = size;
 334                 if (num > 0 && num < session->cur_msg)
 335                         session->cur_total_bytes += size;
 336         }
 337
 338         return PS_SUCCESS;
 339 }
 340
 341 static gint pop3_retr_send(Pop3Session *session)
 342 {
 343         session->state = POP3_RETR;
 344         debug_print("retrieving %d [%s]\n", session->cur_msg,
 345                 session->msg[session->cur_msg].uidl ?
 346                  session->msg[session->cur_msg].uidl:" ");
 347         pop3_gen_send(session, "RETR %d", session->cur_msg);
 348         return PS_SUCCESS;
 349 }
 350
 351 static gint pop3_retr_recv(Pop3Session *session, const gchar *data, guint len)
 352 {
 353         gchar *file;
 354         gint drop_ok;
 355         MailReceiveData mail_receive_data;
 356
 357         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 358          * because some plugins may think that it has a C string. */
 359         mail_receive_data.session  = session;
 360         mail_receive_data.data     = g_new0(gchar, len + 1);
 361         mail_receive_data.data_len = len;
 362         memcpy(mail_receive_data.data, data, len);
 363
 364         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 365
 366         file = get_tmp_file();
 367         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 368                                    mail_receive_data.data_len, NULL) < 0) {
 369                 g_free(file);
 370                 g_free(mail_receive_data.data);
 371                 session->error_val = PS_IOERR;
 372                 return -1;
 373         }
 374         g_free(mail_receive_data.data);
 375
 376         if (session->msg[session->cur_msg].partial_recv
 377             == POP3_MUST_COMPLETE_RECV) {
 378                 gchar *old_file = partial_get_filename(
 379                                 session->ac_prefs->recv_server,
 380                                 session->ac_prefs->userid,
 381                                 session->msg[session->cur_msg].uidl);
 382
 383                 if (old_file) {
 384                         partial_delete_old(old_file);
 385                         g_free(old_file);
 386                 }
 387         }
 388
 389         /* drop_ok: 0: success 1: don't receive -1: error */
 390         drop_ok = session->drop_message(session, file);
 391
 392         g_free(file);
 393         if (drop_ok < 0) {
 394                 session->error_val = PS_IOERR;
 395                 return -1;
 396         }
 397
 398         session->cur_total_bytes += session->msg[session->cur_msg].size;
 399         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 400         session->cur_total_num++;
 401
 402         session->msg[session->cur_msg].received = TRUE;
 403         session->msg[session->cur_msg].partial_recv = POP3_TOTALLY_RECEIVED;
 404
 405         session->msg[session->cur_msg].recv_time =
 406                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 407
 408         return PS_SUCCESS;
 409 }
 410
 411 static gint pop3_top_send(Pop3Session *session, gint max_size)
 412 {
 413         gint num_lines = (max_size*1024)/82; /* consider lines to be 80 chars */
 414         session->state = POP3_TOP;
 415         pop3_gen_send(session, "TOP %d %d", session->cur_msg, num_lines);
 416         return PS_SUCCESS;
 417 }
 418
 419 static gint pop3_top_recv(Pop3Session *session, const gchar *data, guint len)
 420 {
 421         gchar *file;
 422         gint drop_ok;
 423         MailReceiveData mail_receive_data;
 424         gchar *partial_notice = NULL;
 425
 426         /* NOTE: we allocate a slightly larger buffer with a zero terminator
 427          * because some plugins may think that it has a C string. */
 428         mail_receive_data.session  = session;
 429         mail_receive_data.data     = g_new0(gchar, len + 1);
 430         mail_receive_data.data_len = len;
 431         memcpy(mail_receive_data.data, data, len);
 432
 433         hooks_invoke(MAIL_RECEIVE_HOOKLIST, &mail_receive_data);
 434
 435         partial_notice = g_strdup_printf("SC-Marked-For-Download: 0\n"
 436                                          "SC-Partially-Retrieved: %s\n"
 437                                          "SC-Account-Server: %s\n"
 438                                          "SC-Account-Login: %s\n"
 439                                          "SC-Message-Size: %d",
 440                                          session->msg[session->cur_msg].uidl,
 441                                          session->ac_prefs->recv_server,
 442                                          session->ac_prefs->userid,
 443                                          session->msg[session->cur_msg].size);
 444         file = get_tmp_file();
 445         if (pop3_write_msg_to_file(file, mail_receive_data.data,
 446                                    mail_receive_data.data_len,
 447                                    partial_notice) < 0) {
 448                 g_free(file);
 449                 g_free(mail_receive_data.data);
 450                 session->error_val = PS_IOERR;
 451                 g_free(partial_notice);
 452                 return -1;
 453         }
 454         g_free(mail_receive_data.data);
 455         g_free(partial_notice);
 456
 457         /* drop_ok: 0: success 1: don't receive -1: error */
 458         drop_ok = session->drop_message(session, file);
 459         g_free(file);
 460         if (drop_ok < 0) {
 461                 session->error_val = PS_IOERR;
 462                 return -1;
 463         }
 464
 465         session->cur_total_bytes += session->msg[session->cur_msg].size;
 466         session->cur_total_recv_bytes += session->msg[session->cur_msg].size;
 467         session->cur_total_num++;
 468
 469         session->msg[session->cur_msg].received = TRUE;
 470         session->msg[session->cur_msg].partial_recv = POP3_PARTIALLY_RECEIVED;
 471         session->msg[session->cur_msg].recv_time =
 472                 drop_ok == 1 ? RECV_TIME_KEEP : session->current_time;
 473
 474         return PS_SUCCESS;
 475 }
 476
 477 static gint pop3_delete_send(Pop3Session *session)
 478 {
 479         session->state = POP3_DELETE;
 480         pop3_gen_send(session, "DELE %d", session->cur_msg);
 481         return PS_SUCCESS;
 482 }
 483
 484 static gint pop3_delete_recv(Pop3Session *session)
 485 {
 486         session->msg[session->cur_msg].deleted = TRUE;
 487         return PS_SUCCESS;
 488 }
 489
 490 static gint pop3_logout_send(Pop3Session *session)
 491 {
 492         session->state = POP3_LOGOUT;
 493         pop3_gen_send(session, "QUIT");
 494         return PS_SUCCESS;
 495 }
 496
 497 static void pop3_gen_send(Pop3Session *session, const gchar *format, ...)
 498 {
 499         gchar buf[POPBUFSIZE + 1];
 500         va_list args;
 501
 502         va_start(args, format);
 503         g_vsnprintf(buf, sizeof(buf) - 2, format, args);
 504         va_end(args);
 505
 506         if (!g_ascii_strncasecmp(buf, "PASS ", 5))
 507                 log_print(LOG_PROTOCOL, "POP3> PASS ********\n");
 508         else
 509                 log_print(LOG_PROTOCOL, "POP3> %s\n", buf);
 510
 511         session_send_msg(SESSION(session), SESSION_MSG_NORMAL, buf);
 512 }
 513
 514 Session *pop3_session_new(PrefsAccount *account)
 515 {
 516         Pop3Session *session;
 517
 518         g_return_val_if_fail(account != NULL, NULL);
 519
 520         session = g_new0(Pop3Session, 1);
 521
 522         session_init(SESSION(session));
 523
 524         SESSION(session)->type = SESSION_POP3;
 525
 526         SESSION(session)->recv_msg = pop3_session_recv_msg;
 527         SESSION(session)->recv_data_finished = pop3_session_recv_data_finished;
 528         SESSION(session)->send_data_finished = NULL;
 529
 530         SESSION(session)->destroy = pop3_session_destroy;
 531
 532         session->state = POP3_READY;
 533         session->ac_prefs = account;
 534         session->pop_before_smtp = FALSE;
 535         pop3_get_uidl_table(account, session);
 536         session->current_time = time(NULL);
 537         session->error_val = PS_SUCCESS;
 538         session->error_msg = NULL;
 539
 540         return SESSION(session);
 541 }
 542
 543 static void pop3_session_destroy(Session *session)
 544 {
 545         Pop3Session *pop3_session = POP3_SESSION(session);
 546         gint n;
 547
 548         g_return_if_fail(session != NULL);
 549
 550         for (n = 1; n <= pop3_session->count; n++)
 551                 g_free(pop3_session->msg[n].uidl);
 552         g_free(pop3_session->msg);
 553
 554         if (pop3_session->uidl_table) {
 555                 hash_free_strings(pop3_session->uidl_table);
 556                 g_hash_table_destroy(pop3_session->uidl_table);
 557         }
 558
 559         if (pop3_session->partial_recv_table) {
 560                 hash_free_strings(pop3_session->partial_recv_table);
 561                 g_hash_table_destroy(pop3_session->partial_recv_table);
 562         }
 563
 564         g_free(pop3_session->greeting);
 565         g_free(pop3_session->user);
 566         g_free(pop3_session->pass);
 567         g_free(pop3_session->error_msg);
 568 }
 569
 570 void pop3_get_uidl_table(PrefsAccount *ac_prefs, Pop3Session *session)
 571 {
 572         GHashTable *table;
 573         GHashTable *partial_recv_table;
 574         gchar *path;
 575         FILE *fp;
 576         gchar buf[POPBUFSIZE];
 577         gchar uidl[POPBUFSIZE];
 578         time_t recv_time;
 579         time_t now;
 580         gint partial_recv;
 581         gchar *sanitized_uid = g_strdup(ac_prefs->userid);
 582
 583         subst_for_filename(sanitized_uid);
 584
 585         table = g_hash_table_new(g_str_hash, g_str_equal);
 586         partial_recv_table = g_hash_table_new(g_str_hash, g_str_equal);
 587
 588         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 589                            "uidl", G_DIR_SEPARATOR_S, ac_prefs->recv_server,
 590                            "-", sanitized_uid, NULL);
 591
 592         g_free(sanitized_uid);
 593         if ((fp = g_fopen(path, "rb")) == NULL) {
 594                 if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 595                 g_free(path);
 596                 path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 597                                    "uidl-", ac_prefs->recv_server,
 598                                    "-", ac_prefs->userid, NULL);
 599                 if ((fp = g_fopen(path, "rb")) == NULL) {
 600                         if (ENOENT != errno) FILE_OP_ERROR(path, "fopen");
 601                         g_free(path);
 602                         session->uidl_table = table;
 603                         session->partial_recv_table = partial_recv_table;
 604                         return;
 605                 }
 606         }
 607         g_free(path);
 608
 609         now = time(NULL);
 610
 611         while (fgets(buf, sizeof(buf), fp) != NULL) {
 612                 gchar tmp[POPBUFSIZE];
 613                 strretchomp(buf);
 614                 recv_time = RECV_TIME_NONE;
 615                 partial_recv = POP3_TOTALLY_RECEIVED;
 616
 617                 if (sscanf(buf, "%s\t%ld\t%s", uidl, (long int *) &recv_time, tmp) < 3) {
 618                         if (sscanf(buf, "%s\t%ld", uidl, (long int *) &recv_time) != 2) {
 619                                 if (sscanf(buf, "%s", uidl) != 1)
 620                                         continue;
 621                                 else {
 622                                         recv_time = now;
 623                                         strcpy(tmp, "0");
 624                                 }
 625                         } else {
 626                                 strcpy(tmp, "0");
 627                         }
 628                 }
 629
 630                 if (recv_time == RECV_TIME_NONE)
 631                         recv_time = RECV_TIME_RECEIVED;
 632                 g_hash_table_insert(table, g_strdup(uidl),
 633                                     GINT_TO_POINTER(recv_time));
 634                 if (strlen(tmp) == 1)
 635                         partial_recv = atoi(tmp); /* totally received ?*/
 636                 else
 637                         partial_recv = POP3_MUST_COMPLETE_RECV;
 638
 639                 g_hash_table_insert(partial_recv_table, g_strdup(uidl),
 640                                     GINT_TO_POINTER(partial_recv));
 641         }
 642
 643         fclose(fp);
 644         session->uidl_table = table;
 645         session->partial_recv_table = partial_recv_table;
 646
 647         return;
 648 }
 649
 650 #define TRY(func) \
 651 if (!(func)) \
 652 { \
 653         g_warning("failed to write\n"); \
 654         goto err_write;                 \
 655 } \
 656
 657 gint pop3_write_uidl_list(Pop3Session *session)
 658 {
 659         gchar *path, *tmp_path;
 660         FILE *fp;
 661         Pop3MsgInfo *msg;
 662         gint n;
 663         gchar *sanitized_uid = g_strdup(session->ac_prefs->userid);
 664
 665         subst_for_filename(sanitized_uid);
 666
 667
 668         if (!session->uidl_is_valid) return 0;
 669
 670         path = g_strconcat(get_rc_dir(), G_DIR_SEPARATOR_S,
 671                            "uidl", G_DIR_SEPARATOR_S,
 672                            session->ac_prefs->recv_server,
 673                            "-", sanitized_uid, NULL);
 674         tmp_path = g_strconcat(path, ".tmp", NULL);
 675
 676         g_free(sanitized_uid);
 677
 678         if ((fp = g_fopen(tmp_path, "wb")) == NULL) {
 679                 FILE_OP_ERROR(tmp_path, "fopen");
 680                 goto err_write;
 681         }
 682
 683         for (n = 1; n <= session->count; n++) {
 684                 msg = &session->msg[n];
 685                 if (msg->uidl && msg->received &&
 686                     (!msg->deleted || session->state != POP3_DONE))
 687                         TRY(fprintf(fp, "%s\t%ld\t%d\n",
 688                                 msg->uidl, (long int)
 689                                 msg->recv_time,
 690                                 msg->partial_recv)
 691                             > 0);
 692         }
 693
 694         if (fclose(fp) == EOF) {
 695                 FILE_OP_ERROR(tmp_path, "fclose");
 696                 fp = NULL;
 697                 goto err_write;
 698         }
 699         fp = NULL;
 700 #ifdef G_OS_WIN32
 701         g_unlink(path);
 702 #endif
 703         if (g_rename(tmp_path, path) < 0) {
 704                 FILE_OP_ERROR(path, "rename");
 705                 goto err_write;
 706         }
 707         g_free(path);
 708         g_free(tmp_path);
 709         return 0;
 710 err_write:
 711         if (fp)
 712                 fclose(fp);
 713         g_free(path);
 714         g_free(tmp_path);
 715         return -1;
 716 }
 717
 718 #undef TRY
 719
 720 static gint pop3_write_msg_to_file(const gchar *file, const gchar *data,
 721                                    guint len, const gchar *prefix)
 722 {
 723         FILE *fp;
 724         const gchar *prev, *cur;
 725
 726         g_return_val_if_fail(file != NULL, -1);
 727
 728         if ((fp = g_fopen(file, "wb")) == NULL) {
 729                 FILE_OP_ERROR(file, "fopen");
 730                 return -1;
 731         }
 732
 733         if (change_file_mode_rw(fp, file) < 0)
 734                 FILE_OP_ERROR(file, "chmod");
 735
 736         if (prefix != NULL) {
 737                 fprintf(fp, "%s", prefix);
 738                 fprintf(fp, "\n");
 739         }
 740
 741         /* +------------------+----------------+--------------------------+ *
 742          * ^data              ^prev            ^cur             data+len-1^ */
 743
 744         prev = data;
 745         while ((cur = (gchar *)my_memmem(prev, len - (prev - data), "\r\n", 2))
 746                != NULL) {
 747                 if ((cur > prev && fwrite(prev, 1, cur - prev, fp) < 1) ||
 748                     fputc('\n', fp) == EOF) {
 749                         FILE_OP_ERROR(file, "fwrite");
 750                         g_warning("can't write to file: %s\n", file);
 751                         fclose(fp);
 752                         g_unlink(file);
 753                         return -1;
 754                 }
 755
 756                 if (cur == data + len - 1) {
 757                         prev = cur + 1;
 758                         break;
 759                 }
 760
 761                 if (*(cur + 1) == '\n')
 762                         prev = cur + 2;
 763                 else
 764                         prev = cur + 1;
 765
 766                 if (prev - data < len - 1 && *prev == '.' && *(prev + 1) == '.')
 767                         prev++;
 768
 769                 if (prev - data >= len)
 770                         break;
 771         }
 772
 773         if (prev - data < len &&
 774             fwrite(prev, 1, len - (prev - data), fp) < 1) {
 775                 FILE_OP_ERROR(file, "fwrite");
 776                 g_warning("can't write to file: %s\n", file);
 777                 fclose(fp);
 778                 g_unlink(file);
 779                 return -1;
 780         }
 781         if (data[len - 1] != '\r' && data[len - 1] != '\n') {
 782                 if (fputc('\n', fp) == EOF) {
 783                         FILE_OP_ERROR(file, "fputc");
 784                         g_warning("can't write to file: %s\n", file);
 785                         fclose(fp);
 786                         g_unlink(file);
 787                         return -1;
 788                 }
 789         }
 790
 791         if (fclose(fp) == EOF) {
 792                 FILE_OP_ERROR(file, "fclose");
 793                 g_unlink(file);
 794                 return -1;
 795         }
 796
 797         return 0;
 798 }
 799
 800 static Pop3State pop3_lookup_next(Pop3Session *session)
 801 {
 802         Pop3MsgInfo *msg;
 803         PrefsAccount *ac = session->ac_prefs;
 804         gint size;
 805         gboolean size_limit_over;
 806
 807         for (;;) {
 808                 msg = &session->msg[session->cur_msg];
 809                 size = msg->size;
 810                 size_limit_over =
 811                     (ac->enable_size_limit &&
 812                      ac->size_limit > 0 &&
 813                      size > ac->size_limit * 1024);
 814
 815                 if (ac->rmmail &&
 816                     msg->recv_time != RECV_TIME_NONE &&
 817                     msg->recv_time != RECV_TIME_KEEP &&
 818                     msg->partial_recv == POP3_TOTALLY_RECEIVED &&
 819                     session->current_time - msg->recv_time >=
 820                     ac->msg_leave_time * 24 * 60 * 60) {
 821                         log_message(LOG_PROTOCOL,
 822                                         _("POP3: Deleting expired message %d [%s]\n"),
 823                                         session->cur_msg, msg->uidl?msg->uidl:" ");
 824                         session->cur_total_bytes += size;
 825                         pop3_delete_send(session);
 826                         return POP3_DELETE;
 827                 }
 828
 829                 if (size_limit_over) {
 830                         if (!msg->received && msg->partial_recv !=
 831                             POP3_MUST_COMPLETE_RECV) {
 832                                 pop3_top_send(session, ac->size_limit);
 833                                 return POP3_TOP;
 834                         } else if (msg->partial_recv == POP3_MUST_COMPLETE_RECV)
 835                                 break;
 836
 837                         log_message(LOG_PROTOCOL,
 838                                         _("POP3: Skipping message %d [%s] (%d bytes)\n"),
 839                                         session->cur_msg, msg->uidl?msg->uidl:" ", size);
 840                 }
 841
 842                 if (size == 0 || msg->received || size_limit_over) {
 843                         session->cur_total_bytes += size;
 844                         if (session->cur_msg == session->count) {
 845                                 pop3_logout_send(session);
 846                                 return POP3_LOGOUT;
 847                         } else
 848                                 session->cur_msg++;
 849                 } else
 850                         break;
 851         }
 852
 853         pop3_retr_send(session);
 854         return POP3_RETR;
 855 }
 856
 857 static Pop3ErrorValue pop3_ok(Pop3Session *session, const gchar *msg)
 858 {
 859         Pop3ErrorValue ok;
 860
 861         log_print(LOG_PROTOCOL, "POP3< %s\n", msg);
 862
 863         if (!strncmp(msg, "+OK", 3))
 864                 ok = PS_SUCCESS;
 865         else if (!strncmp(msg, "-ERR", 4)) {
 866                 if (strstr(msg + 4, "lock") ||
 867                     strstr(msg + 4, "Lock") ||
 868                     strstr(msg + 4, "LOCK") ||
 869                     strstr(msg + 4, "wait")) {
 870                         log_error(LOG_PROTOCOL, _("mailbox is locked\n"));
 871                         ok = PS_LOCKBUSY;
 872                 } else if (strcasestr(msg + 4, "timeout")) {
 873                         log_error(LOG_PROTOCOL, _("Session timeout\n"));
 874                         ok = PS_ERROR;
 875                 } else {
 876                         switch (session->state) {
 877 #if USE_OPENSSL
 878                         case POP3_STLS:
 879                                 log_error(LOG_PROTOCOL, _("couldn't start TLS session\n"));
 880                                 ok = PS_ERROR;
 881                                 break;
 882 #endif
 883                         case POP3_GETAUTH_USER:
 884                         case POP3_GETAUTH_PASS:
 885                         case POP3_GETAUTH_APOP:
 886                                 log_error(LOG_PROTOCOL, _("error occurred on authentication\n"));
 887                                 ok = PS_AUTHFAIL;
 888                                 break;
 889                         case POP3_GETRANGE_LAST:
 890                         case POP3_GETRANGE_UIDL:
 891                         case POP3_TOP:
 892                                 log_warning(LOG_PROTOCOL, _("command not supported\n"));
 893                                 ok = PS_NOTSUPPORTED;
 894                                 break;
 895
 896                         default:
 897                                 log_error(LOG_PROTOCOL, _("error occurred on POP3 session\n"));
 898                                 ok = PS_ERROR;
 899                         }
 900                 }
 901
 902                 g_free(session->error_msg);
 903                 session->error_msg = g_strdup(msg);
 904                 g_printerr("POP3: %s\n", msg);
 905         } else
 906                 ok = PS_PROTOCOL;
 907
 908         session->error_val = ok;
 909         return ok;
 910 }
 911
 912 static gint pop3_session_recv_msg(Session *session, const gchar *msg)
 913 {
 914         Pop3Session *pop3_session = POP3_SESSION(session);
 915         Pop3ErrorValue val = PS_SUCCESS;
 916         const gchar *body;
 917
 918         body = msg;
 919         if (pop3_session->state != POP3_GETRANGE_UIDL_RECV &&
 920             pop3_session->state != POP3_GETSIZE_LIST_RECV) {
 921                 val = pop3_ok(pop3_session, msg);
 922                 if (val != PS_SUCCESS) {
 923                         if (val != PS_NOTSUPPORTED) {
 924                                 pop3_session->state = POP3_ERROR;
 925                                 return -1;
 926                         }
 927                 }
 928
 929                 if (*body == '+' || *body == '-')
 930                         body++;
 931                 while (g_ascii_isalpha(*body))
 932                         body++;
 933                 while (g_ascii_isspace(*body))
 934                         body++;
 935         }
 936
 937         switch (pop3_session->state) {
 938         case POP3_READY:
 939         case POP3_GREETING:
 940                 pop3_greeting_recv(pop3_session, body);
 941 #if USE_OPENSSL
 942                 if (pop3_session->ac_prefs->ssl_pop == SSL_STARTTLS)
 943                         val = pop3_stls_send(pop3_session);
 944                 else
 945 #endif
 946                 if (pop3_session->ac_prefs->use_apop_auth)
 947                         val = pop3_getauth_apop_send(pop3_session);
 948                 else
 949                         val = pop3_getauth_user_send(pop3_session);
 950                 break;
 951 #if USE_OPENSSL
 952         case POP3_STLS:
 953                 if (pop3_stls_recv(pop3_session) != PS_SUCCESS)
 954                         return -1;
 955                 if (pop3_session->ac_prefs->use_apop_auth)
 956                         val = pop3_getauth_apop_send(pop3_session);
 957                 else
 958                         val = pop3_getauth_user_send(pop3_session);
 959                 break;
 960 #endif
 961         case POP3_GETAUTH_USER:
 962                 val = pop3_getauth_pass_send(pop3_session);
 963                 break;
 964         case POP3_GETAUTH_PASS:
 965         case POP3_GETAUTH_APOP:
 966                 if (!pop3_session->pop_before_smtp)
 967                         val = pop3_getrange_stat_send(pop3_session);
 968                 else
 969                         val = pop3_logout_send(pop3_session);
 970                 break;
 971         case POP3_GETRANGE_STAT:
 972                 if (pop3_getrange_stat_recv(pop3_session, body) < 0)
 973                         return -1;
 974                 if (pop3_session->count > 0)
 975                         val = pop3_getrange_uidl_send(pop3_session);
 976                 else
 977                         val = pop3_logout_send(pop3_session);
 978                 break;
 979         case POP3_GETRANGE_LAST:
 980                 if (val == PS_NOTSUPPORTED)
 981                         pop3_session->error_val = PS_SUCCESS;
 982                 else if (pop3_getrange_last_recv(pop3_session, body) < 0)
 983                         return -1;
 984                 if (pop3_session->cur_msg > 0)
 985                         val = pop3_getsize_list_send(pop3_session);
 986                 else
 987                         val = pop3_logout_send(pop3_session);
 988                 break;
 989         case POP3_GETRANGE_UIDL:
 990                 if (val == PS_NOTSUPPORTED) {
 991                         pop3_session->error_val = PS_SUCCESS;
 992                         val = pop3_getrange_last_send(pop3_session);
 993                 } else {
 994                         pop3_session->state = POP3_GETRANGE_UIDL_RECV;
 995                         session_recv_data(session, 0, ".\r\n");
 996                 }
 997                 break;
 998         case POP3_GETSIZE_LIST:
 999                 pop3_session->state = POP3_GETSIZE_LIST_RECV;
1000                 session_recv_data(session, 0, ".\r\n");
1001                 break;
1002         case POP3_RETR:
1003                 pop3_session->state = POP3_RETR_RECV;
1004                 session_recv_data(session, 0, ".\r\n");
1005                 break;
1006         case POP3_TOP:
1007                 if (val == PS_NOTSUPPORTED) {
1008                         pop3_session->error_val = PS_SUCCESS;
1009                 } else {
1010                         pop3_session->state = POP3_TOP_RECV;
1011                         session_recv_data(session, 0, ".\r\n");
1012                 }
1013                 break;
1014         case POP3_DELETE:
1015                 pop3_delete_recv(pop3_session);
1016                 if (pop3_session->cur_msg == pop3_session->count)
1017                         val = pop3_logout_send(pop3_session);
1018                 else {
1019                         pop3_session->cur_msg++;
1020                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1021                                 return -1;
1022                 }
1023                 break;
1024         case POP3_LOGOUT:
1025                 pop3_session->state = POP3_DONE;
1026                 session_disconnect(session);
1027                 break;
1028         case POP3_ERROR:
1029         default:
1030                 return -1;
1031         }
1032
1033         return val == PS_SUCCESS?0:-1;
1034 }
1035
1036 static gint pop3_session_recv_data_finished(Session *session, guchar *data,
1037                                             guint len)
1038 {
1039         Pop3Session *pop3_session = POP3_SESSION(session);
1040         Pop3ErrorValue val = PS_SUCCESS;
1041
1042         switch (pop3_session->state) {
1043         case POP3_GETRANGE_UIDL_RECV:
1044                 val = pop3_getrange_uidl_recv(pop3_session, data, len);
1045                 if (val == PS_SUCCESS) {
1046                         if (pop3_session->new_msg_exist)
1047                                 pop3_getsize_list_send(pop3_session);
1048                         else
1049                                 pop3_logout_send(pop3_session);
1050                 } else
1051                         return -1;
1052                 break;
1053         case POP3_GETSIZE_LIST_RECV:
1054                 val = pop3_getsize_list_recv(pop3_session, data, len);
1055                 if (val == PS_SUCCESS) {
1056                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1057                                 return -1;
1058                 } else
1059                         return -1;
1060                 break;
1061         case POP3_RETR_RECV:
1062                 if (pop3_retr_recv(pop3_session, data, len) < 0)
1063                         return -1;
1064
1065                 if (pop3_session->ac_prefs->rmmail &&
1066                     pop3_session->ac_prefs->msg_leave_time == 0 &&
1067                     pop3_session->msg[pop3_session->cur_msg].recv_time
1068                     != RECV_TIME_KEEP)
1069                         pop3_delete_send(pop3_session);
1070                 else if (pop3_session->cur_msg == pop3_session->count)
1071                         pop3_logout_send(pop3_session);
1072                 else {
1073                         pop3_session->cur_msg++;
1074                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1075                                 return -1;
1076                 }
1077                 break;
1078         case POP3_TOP_RECV:
1079                 if (pop3_top_recv(pop3_session, data, len) < 0)
1080                         return -1;
1081
1082                 if (pop3_session->cur_msg == pop3_session->count)
1083                         pop3_logout_send(pop3_session);
1084                 else {
1085                         pop3_session->cur_msg++;
1086                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1087                                 return -1;
1088                 }
1089                 break;
1090         case POP3_TOP:
1091                 log_warning(LOG_PROTOCOL, _("TOP command unsupported\n"));
1092                 if (pop3_session->cur_msg == pop3_session->count)
1093                         pop3_logout_send(pop3_session);
1094                 else {
1095                         pop3_session->cur_msg++;
1096                         if (pop3_lookup_next(pop3_session) == POP3_ERROR)
1097                                 return -1;
1098                 }
1099                 break;
1100         case POP3_ERROR:
1101         default:
1102                 return -1;
1103         }
1104
1105         return 0;
1106 }