public int RecvTestPacket(ref ushort pktType, ref int seq, byte[] payload, ref int payloadSize){
var bufSize = m_recvBuf.data.Length;
var recvRet = RecvFrom(m_recvBuf.data, 0, ref bufSize, SocketFlags.None, ref m_recvAddr);
if((m_lastNetError == SocketError.Success) && (recvRet >= HEADER_SIZE)){
m_recvBuf.position = 0;
var mc = AmNetUtil.ntohl(m_recvBuf.readUnsignedInt());
if(mc != MAGIC_COOKIE){
m_lastNetError = SocketError.SocketError;
}
else {
pktType = AmNetUtil.ntohs(m_recvBuf.readUnsignedShort());
var pktlen = AmNetUtil.ntohs(m_recvBuf.readUnsignedShort());
if(payloadSize < (pktlen - HEADER_SIZE)){
m_lastNetError = SocketError.SocketError;
}
else {
payloadSize = (int)pktlen - (int)HEADER_SIZE;
seq = AmNetUtil.ntohl(m_recvBuf.readInt());
if(payloadSize > 0){
AmByteArray.Memcpy(payload, m_recvBuf, payloadSize);
}
m_lastNetError = SocketError.Success;
}
}
}
return recvRet;
}
public UDPingClient(string serverAddr, int serverPort, int bindBasePort = 5730){
int retry = 0;
bool isError = false;
m_sendBuf = new AmByteArray(SEND_BUFFER_SIZE);
m_recvBuf = new AmByteArray(RECV_BUFFER_SIZE);
m_sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
try {
m_sock.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
m_sock.Blocking = false;
m_sendAddr = new IPEndPoint(IPAddress.Parse(serverAddr), serverPort);
m_recvAddr = new IPEndPoint(IPAddress.Any, 0);
}
catch (SocketException e){
m_lastNetError = e.SocketErrorCode;
isError = true;
goto wayout;
}
catch (Exception e){
m_lastNetError = SocketError.SocketError;
isError = true;
goto wayout;
}
while(retry < 10){
var bindAddr = new IPEndPoint(IPAddress.Any, bindBasePort + retry);
try {
m_sock.Bind(bindAddr);
break;
}
catch (SocketException e){
if(e.SocketErrorCode == SocketError.AddressAlreadyInUse){ ++retry; continue; }
else {
m_lastNetError = e.SocketErrorCode;
isError = true;
break;
}
}
catch (Exception e){
m_lastNetError = SocketError.SocketError;
isError = true;
break;
}
}
wayout:
if(isError){
if(m_sock != null){ Dispose(); }
}
else {
m_lastNetError = SocketError.Success;
}
}
public int SendTestPacket(ushort pktType, int seq, byte[] payload, int payloadSize){
var pkt = m_sendBuf;
int len = 0;
pkt.position = 0;
pkt.writeUnsignedInt(AmNetUtil.htonl(MAGIC_COOKIE)); len += 4;
//pkt.writeUnsignedInt(MAGIC_COOKIE); len += 4;
pkt.writeUnsignedShort(AmNetUtil.htons(MSG_TYPE_ECHO)); len += 2;
pkt.writeUnsignedShort(AmNetUtil.htons((ushort)0)); len += 2;
pkt.writeInt(AmNetUtil.htonl(seq)); len += 4;
if(payloadSize > 0){
AmByteArray.Memcpy(pkt, payload, payloadSize); len += payloadSize;
}
pkt.position = 6;
pkt.writeUnsignedShort(AmNetUtil.htons((ushort)len));
return SendTo(pkt.data, 0, ref len, SocketFlags.None, m_sendAddr);
}
