/* * Copyright (C) 2003-2010 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "config.h" #include "client_internal.h" #include "fifo_buffer.h" #include "socket_util.h" #include "permission.h" #include <assert.h> #include <unistd.h> #ifdef HAVE_LIBWRAP #include <tcpd.h> #endif #define LOG_LEVEL_SECURE G_LOG_LEVEL_INFO static const char GREETING[] = "OK MPD " PROTOCOL_VERSION "\n"; void client_new(int fd, const struct sockaddr *sa, size_t sa_length, int uid) { static unsigned int next_client_num; struct client *client; char *remote; assert(fd >= 0); #ifdef HAVE_LIBWRAP if (sa->sa_family != AF_UNIX) { char *hostaddr = sockaddr_to_string(sa, sa_length, NULL); const char *progname = g_get_prgname(); struct request_info req; request_init(&req, RQ_FILE, fd, RQ_DAEMON, progname, 0); fromhost(&req); if (!hosts_access(&req)) { /* tcp wrappers says no */ g_log(G_LOG_DOMAIN, LOG_LEVEL_SECURE, "libwrap refused connection (libwrap=%s) from %s", progname, hostaddr); g_free(hostaddr); close(fd); return; } g_free(hostaddr); } #endif /* HAVE_WRAP */ if (client_list_is_full()) { g_warning("Max Connections Reached!"); close(fd); return; } client = g_new0(struct client, 1); #ifndef G_OS_WIN32 client->channel = g_io_channel_unix_new(fd); #else client->channel = g_io_channel_win32_new_socket(fd); #endif /* GLib is responsible for closing the file descriptor */ g_io_channel_set_close_on_unref(client->channel, true); /* NULL encoding means the stream is binary safe; the MPD protocol is UTF-8 only, but we are doing this call anyway to prevent GLib from messing around with the stream */ g_io_channel_set_encoding(client->channel, NULL, NULL); /* we prefer to do buffering */ g_io_channel_set_buffered(client->channel, false); client->source_id = g_io_add_watch(client->channel, G_IO_IN|G_IO_ERR|G_IO_HUP, client_in_event, client); client->input = fifo_buffer_new(4096); client->permission = getDefaultPermissions(); client->uid = uid; client->last_activity = g_timer_new(); client->cmd_list = NULL; client->cmd_list_OK = -1; client->cmd_list_size = 0; client->deferred_send = g_queue_new(); client->deferred_bytes = 0; client->num = next_client_num++; client->send_buf_used = 0; (void)write(fd, GREETING, sizeof(GREETING) - 1); client_list_add(client); remote = sockaddr_to_string(sa, sa_length, NULL); g_log(G_LOG_DOMAIN, LOG_LEVEL_SECURE, "[%u] opened from %s", client->num, remote); g_free(remote); } static void deferred_buffer_free(gpointer data, G_GNUC_UNUSED gpointer user_data) { struct deferred_buffer *buffer = data; g_free(buffer); } void client_close(struct client *client) { client_list_remove(client); client_set_expired(client); g_timer_destroy(client->last_activity); if (client->cmd_list) { free_cmd_list(client->cmd_list); client->cmd_list = NULL; } g_queue_foreach(client->deferred_send, deferred_buffer_free, NULL); g_queue_free(client->deferred_send); fifo_buffer_free(client->input); g_log(G_LOG_DOMAIN, LOG_LEVEL_SECURE, "[%u] closed", client->num); g_free(client); }