118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/***************************************************************************
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* Copyright (C) 06/2006 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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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 *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "configfile.h"
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#include "logging.h"
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static struct sockaddr_in dest_addr;
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int mcast_init()
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{
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struct ip_mreq multiaddr;
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struct ifreq ifr;
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char *mcastdev, *mcastgroup;
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int mcastport, sock;
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// open socket
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock == -1) {
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log_print(LOG_ERROR, "mcast_init: socket()");
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return -1;
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}
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// get device flags
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mcastdev = config_get_string("global", "mcastdev", "eth0");
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strncpy(ifr.ifr_name, mcastdev, sizeof(ifr.ifr_name));
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if (ioctl(sock, SIOCGIFFLAGS, &ifr) != 0) {
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log_print(LOG_WARN, "mcast_init: ioctl(SIOCGIFFLAGS)");
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close(sock);
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return -1;
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}
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// check device flags
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if ((ifr.ifr_flags & (IFF_UP | IFF_MULTICAST)) != (IFF_UP | IFF_MULTICAST)) {
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log_print(LOG_WARN, "mcast_init: device %s not up");
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close(sock);
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return -1;
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}
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if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifr.ifr_name, sizeof(ifr.ifr_name)) < 0) {
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log_print(LOG_WARN, "mcast_init: setsockopt(SO_BINDTODEVICE)");
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// close(sock);
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// return -1;
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}
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mcastgroup = config_get_string("global", "mcastgroup", "224.0.0.1");
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mcastport = config_get_int("global", "mcastport", 2000);
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dest_addr.sin_family = AF_INET;
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inet_aton(mcastgroup, &dest_addr.sin_addr);
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dest_addr.sin_port = htons(mcastport);
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if (bind(sock, (struct sockaddr*)&dest_addr, sizeof(dest_addr)) < 0) {
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log_print(LOG_WARN, "mcast_init: bind()");
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return -1;
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}
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// get interface address
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if (ioctl(sock, SIOCGIFADDR, &ifr) != 0) {
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log_print(LOG_WARN, "mcast_init: ioctl(SIOCGIFADDR)");
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close(sock);
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return -1;
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}
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// check address family
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if (ifr.ifr_addr.sa_family != AF_INET) {
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log_print(LOG_WARN, "mcast_init: unknown address family");
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close(sock);
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return -1;
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}
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inet_aton(mcastgroup, &multiaddr.imr_multiaddr);
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multiaddr.imr_interface.s_addr = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr;
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if (setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
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&multiaddr, sizeof(multiaddr)) == -1) {
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log_print(LOG_WARN, "mcast_init: setsockopt(IP_ADD_MEMBERSHIP)");
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close(sock);
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return -1;
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}
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return sock;
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}
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int mcast_send(int sock, char *buf, int len)
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{
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return sendto(sock, buf, len, MSG_NOSIGNAL, (const struct sockaddr*)&dest_addr, sizeof(dest_addr));
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}
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void msock_close(int sock)
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{
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close(sock);
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}
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