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/*
* Copyright (C) 2003-2011 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 "ntp_server.h"
#include "signals.h"
#include <glib.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#ifdef WIN32
#define WINVER 0x0501
#include <ws2tcpip.h>
#include <winsock.h>
#else
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
static bool quit = false;
void
on_quit(void)
{
quit = true;
}
static int bind_host(int sd, char *hostname, unsigned long ulAddr,
unsigned short *port)
{
struct sockaddr_in my_addr;
socklen_t nlen = sizeof(struct sockaddr);
struct hostent *h;
memset(&my_addr, 0, sizeof(my_addr));
/* use specified hostname */
if (hostname) {
/* get server IP address (no check if input is IP address or DNS name) */
h = gethostbyname(hostname);
if (h == NULL) {
if (strstr(hostname, "255.255.255.255") == hostname) {
my_addr.sin_addr.s_addr=-1;
} else {
if ((my_addr.sin_addr.s_addr = inet_addr(hostname)) == 0xFFFFFFFF) {
return -1;
}
}
my_addr.sin_family = AF_INET;
} else {
my_addr.sin_family = h->h_addrtype;
memcpy((char *) &my_addr.sin_addr.s_addr,
h->h_addr_list[0], h->h_length);
}
} else {
// if hostname=NULL, use INADDR_ANY
if (ulAddr)
my_addr.sin_addr.s_addr = ulAddr;
else
my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
my_addr.sin_family = AF_INET;
}
/* bind a specified port */
my_addr.sin_port = htons(*port);
if (bind(sd, (struct sockaddr *) &my_addr, sizeof(my_addr)) < 0) {
return -1;
}
if (*port == 0) {
getsockname(sd, (struct sockaddr *) &my_addr, &nlen);
*port = ntohs(my_addr.sin_port);
}
return 0;
}
static int
open_udp_socket(char *hostname, unsigned short *port)
{
int sd;
int size = 30000;
/* socket creation */
sd = socket(PF_INET, SOCK_DGRAM, 0);
if (sd < 0) {
return -1;
}
if (setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (void *) &size, sizeof(size)) < 0) {
return -1;
}
if (bind_host(sd, hostname, 0, port)) {
close(sd);
return -1;
}
return sd;
}
int
main(G_GNUC_UNUSED int argc, G_GNUC_UNUSED char **argv)
{
signals_init();
struct ntp_server ntp;
ntp_server_init(&ntp);
ntp.fd = open_udp_socket(NULL, &ntp.port);
if (ntp.fd < 0) {
g_printerr("Failed to create UDP socket\n");
ntp_server_close(&ntp);
return EXIT_FAILURE;
}
while (!quit) {
struct timeval tv = {
.tv_sec = 1,
.tv_usec = 0,
};
ntp_server_check(&ntp, &tv);
}
ntp_server_close(&ntp);
return EXIT_SUCCESS;
}
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