/*! Assign a socket. <CODE>Open</CODE> assignes a system socket to the
DgramSocket.
\see Socket::close
*/
void DgramSocket::open()
{
_sd = socket(AF_INET, SOCK_DGRAM, 0);
if(_sd<0)
{
throw SocketError("socket()");
}
// all dgram sockets are allowed to send broadcast
int on = 1;
if(::setsockopt(_sd,
SOL_SOCKET, SO_BROADCAST,
reinterpret_cast<SocketOptT *>(&on), sizeof(on)) < 0)
{
throw SocketError("setsockopt(,SOL_SOCKET,SO_BROADCAST)");
}
// by default, multicast only in local network
setTTL(2);
}
MulticastServer::MulticastServer(char *multicastGroup, in_addr_t sourceMulticastIp, unsigned short port, HashTable *_keyHashtable, KeyHashtableTimeout *_keyHashtableTimeout) : Server(SOCK_DGRAM, IPPROTO_IP, port) {
int returnCode;
struct in_addr interfaceIp;
char delimiter[2];
interfaceIp.s_addr = sourceMulticastIp;
multicastServerInitialized = false;
returnCode = joinGroup(multicastGroup, &interfaceIp);
if (returnCode < 0) {
systemLog->sysLog(ERROR, "cannot initialized MulticastServer correctly");
return;
}
returnCode = setTTL(255);
if (returnCode < 0) {
systemLog->sysLog(ERROR, "cannot initialized MulticastServer correctly");
return;
}
delimiter[0] = '\n';
delimiter[1] = '\0';
parser = new Parser(delimiter);
if (! parser) {
systemLog->sysLog(CRITICAL, "cannot create a Parser object: %s", strerror(errno));
return;
}
keyHashtable = _keyHashtable;
keyHashtableTimeout = _keyHashtableTimeout;
/* construct a multicast address structure */
struct sockaddr_in mc_addr;
memset(&mc_addr, 0, sizeof(mc_addr));
mc_addr.sin_family = AF_INET;
mc_addr.sin_addr.s_addr = inet_addr(multicastGroup);
mc_addr.sin_port = htons(port);
if (bind(sd, (struct sockaddr*) &mc_addr, sizeof(mc_addr)) == -1) {
systemLog->sysLog(ERROR, "cannot bind multicast adress: %s\n", strerror(errno));
return;
}
multicastServerInitialized = true;
return;
}
