149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "ntp_server.h"
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#include "signals.h"
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#include <glib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#ifdef WIN32
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#define WINVER 0x0501
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#include <ws2tcpip.h>
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#include <winsock.h>
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#else
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#endif
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static bool quit = false;
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void
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on_quit(void)
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{
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quit = true;
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}
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static int bind_host(int sd, char *hostname, unsigned long ulAddr,
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unsigned short *port)
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{
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struct sockaddr_in my_addr;
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socklen_t nlen = sizeof(struct sockaddr);
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struct hostent *h;
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memset(&my_addr, 0, sizeof(my_addr));
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/* use specified hostname */
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if (hostname) {
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/* get server IP address (no check if input is IP address or DNS name) */
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h = gethostbyname(hostname);
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if (h == NULL) {
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if (strstr(hostname, "255.255.255.255") == hostname) {
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my_addr.sin_addr.s_addr=-1;
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} else {
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if ((my_addr.sin_addr.s_addr = inet_addr(hostname)) == 0xFFFFFFFF) {
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return -1;
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}
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}
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my_addr.sin_family = AF_INET;
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} else {
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my_addr.sin_family = h->h_addrtype;
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memcpy((char *) &my_addr.sin_addr.s_addr,
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h->h_addr_list[0], h->h_length);
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}
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} else {
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// if hostname=NULL, use INADDR_ANY
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if (ulAddr)
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my_addr.sin_addr.s_addr = ulAddr;
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else
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my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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my_addr.sin_family = AF_INET;
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}
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/* bind a specified port */
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my_addr.sin_port = htons(*port);
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if (bind(sd, (struct sockaddr *) &my_addr, sizeof(my_addr)) < 0) {
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return -1;
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}
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if (*port == 0) {
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getsockname(sd, (struct sockaddr *) &my_addr, &nlen);
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*port = ntohs(my_addr.sin_port);
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}
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return 0;
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}
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static int
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open_udp_socket(char *hostname, unsigned short *port)
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{
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int sd;
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int size = 30000;
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/* socket creation */
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sd = socket(PF_INET, SOCK_DGRAM, 0);
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if (sd < 0) {
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return -1;
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}
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if (setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (void *) &size, sizeof(size)) < 0) {
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return -1;
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}
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if (bind_host(sd, hostname, 0, port)) {
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close(sd);
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return -1;
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}
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return sd;
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}
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int
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main(G_GNUC_UNUSED int argc, G_GNUC_UNUSED char **argv)
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{
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signals_init();
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struct ntp_server ntp;
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ntp_server_init(&ntp);
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ntp.fd = open_udp_socket(NULL, &ntp.port);
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if (ntp.fd < 0) {
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g_printerr("Failed to create UDP socket\n");
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ntp_server_close(&ntp);
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return EXIT_FAILURE;
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}
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while (!quit) {
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struct timeval tv = {
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.tv_sec = 1,
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.tv_usec = 0,
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};
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ntp_server_check(&ntp, &tv);
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}
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ntp_server_close(&ntp);
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return EXIT_SUCCESS;
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}
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