/* * 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 #include #include #include #include #ifdef WIN32 #define WINVER 0x0501 #include #include #else #include #include #include #include #endif 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) { 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 (true) { struct timeval tv = { .tv_sec = 1, .tv_usec = 0, }; ntp_server_check(&ntp, &tv); } ntp_server_close(&ntp); return EXIT_SUCCESS; }