// returns true if this was the last entry
public void Unsubscribe(IPAddress sourceAddress, IPAddress destAddress, SocketDataReceivedEventHandler callback)
{
lock (addressEntries) {
int addressCount = 0;
bool isMulticast = IsMulticast(destAddress);
bool isBroadcast = IsBroadcast(destAddress);
bool isSpecialAddress = isMulticast || isBroadcast;
int removeIndex = -1;
for (int i = 0; i < addressEntries.Count; i++) {
AddressEntry entry = addressEntries[i];
if (entry.callback.Equals(callback) && entry.sourceAddress.Equals(sourceAddress) && entry.destAddress.Equals(destAddress)) {
removeIndex = i;
}
else {
if (isSpecialAddress && entry.destAddress.Equals(destAddress)) {
addressCount++;
}
}
}
if (removeIndex != -1) {
addressEntries.RemoveAt(removeIndex);
if (isMulticast && addressCount == 0) {
// remove the multicast address
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.DropMembership, new MulticastOption(destAddress));
}
else if (isBroadcast && addressCount == 0) {
socket.EnableBroadcast = false;
}
}
}
}
// set source to any to receive from any source address, otherwise will only report those source addresses that match
// set dest to any to receive data for any destination address, localhost to get only packets destined to the local
// unicast address, set to any other address (including multicast, broadcast) to get packets for only that destination
public void Subscribe(IPAddress sourceAddress, IPAddress destAddress, SocketDataReceivedEventHandler callback)
{
AddressEntry entry = new AddressEntry(sourceAddress, destAddress, callback);
lock (addressEntries) {
// determine if this is a multicast destination
if (IsMulticast(destAddress)) {
// it is, so join the group if we aren't already in it
bool inGroup = false;
foreach (AddressEntry ent in addressEntries) {
if (ent.destAddress.Equals(destAddress)) {
inGroup = true;
}
}
if (!inGroup) {
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(destAddress));
}
}
if (IsBroadcast(destAddress)) {
if (!socket.EnableBroadcast) {
socket.EnableBroadcast = true;
}
}
// add to the list of address entries
addressEntries.Add(entry);
}
}
public void CloseCall()
{
this.isUdpConnectionMapped = false;
this.udpReceiver.StopReceiver();
this.udpReceiver.SocketDataReceived -= udpReceiver_SocketDataReceived;
this.callHelper.CloseCall();
this.callHelper.DataAvailable -= callHelper_DataAvailable;
}
public void CloseCall(string receiver, string sender, string id)
{
if (this.callHelper != null && this.callHelper.IsCallEstablished)
{
this.isUdpConnectionMapped = false;
this.udpReceiver.StopReceiver();
this.udpReceiver.SocketDataReceived -= udpReceiver_SocketDataReceived;
this.callHelper.CloseCall();
this.callHelper.DataAvailable -= callHelper_DataAvailable;
this.SendMessage(receiver, id, sender, "/call/close");
}
}
// returns true if this was the last entry
public void Unsubscribe(IPAddress sourceAddress, IPAddress destAddress, SocketDataReceivedEventHandler callback)
{
lock (addressEntries) {
int addressCount = 0;
bool isMulticast = IsMulticast(destAddress);
bool isBroadcast = IsBroadcast(destAddress);
bool isSpecialAddress = isMulticast || isBroadcast;
int removeIndex = -1;
for (int i = 0; i < addressEntries.Count; i++)
{
AddressEntry entry = addressEntries[i];
if (entry.callback.Equals(callback) && entry.sourceAddress.Equals(sourceAddress) && entry.destAddress.Equals(destAddress))
{
removeIndex = i;
}
else
{
if (isSpecialAddress && entry.destAddress.Equals(destAddress))
{
addressCount++;
}
}
}
if (removeIndex != -1)
{
addressEntries.RemoveAt(removeIndex);
if (isMulticast && addressCount == 0)
{
// remove the multicast address
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.DropMembership, new MulticastOption(destAddress));
}
else if (isBroadcast && addressCount == 0)
{
socket.EnableBroadcast = false;
}
}
}
}
// set source to any to receive from any source address, otherwise will only report those source addresses that match
// set dest to any to receive data for any destination address, localhost to get only packets destined to the local
// unicast address, set to any other address (including multicast, broadcast) to get packets for only that destination
public void Subscribe(IPAddress sourceAddress, IPAddress destAddress, SocketDataReceivedEventHandler callback)
{
AddressEntry entry = new AddressEntry(sourceAddress, destAddress, callback);
lock (addressEntries) {
// determine if this is a multicast destination
if (IsMulticast(destAddress))
{
// it is, so join the group if we aren't already in it
bool inGroup = false;
foreach (AddressEntry ent in addressEntries)
{
if (ent.destAddress.Equals(destAddress))
{
inGroup = true;
}
}
if (!inGroup)
{
socket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(destAddress));
}
}
if (IsBroadcast(destAddress))
{
if (!socket.EnableBroadcast)
{
socket.EnableBroadcast = true;
}
}
// add to the list of address entries
addressEntries.Add(entry);
}
}
public AddressEntry(IPAddress sourceAddress, IPAddress destAddress, SocketDataReceivedEventHandler callback)
{
this.sourceAddress = sourceAddress;
this.destAddress = destAddress;
this.callback = callback;
}
public AddressEntry(IPAddress sourceAddress, IPAddress destAddress, SocketDataReceivedEventHandler callback)
{
this.sourceAddress = sourceAddress;
this.destAddress = destAddress;
this.callback = callback;
}
