func getNonceFromAserver(clientIpPort string, aserverIpPort string) int64 {
clientConn := common.InitUDPConn(clientIpPort)
aserverUDPAddr := common.ResolveUDPAddr(aserverIpPort)
nonce := client.RetrieveNonce(clientConn, &aserverUDPAddr)
clientConn.Close()
return nonce.Nonce
}
func RunClient(clientIpPort string, aserverIpPort string, secret int64) {
clientConn := common.InitUDPConn(clientIpPort)
aserverUDPAddr := common.ResolveUDPAddr(aserverIpPort)
//Set 10 second timeout for ReadFromUDP
clientConn.SetReadDeadline(time.Now().Add(10 * time.Second))
//Retrieve nonce from aserver and compute MD5(nonce + secret)
nonceMsg := RetrieveNonce(clientConn, &aserverUDPAddr)
hashMsg := common.ComputeHashMessage(nonceMsg.Nonce, secret)
//Retrieve GoalMessage from aserver
goalMsg := RetrieveGoalMsg(clientConn, &aserverUDPAddr, hashMsg)
fmt.Println("Received goal message from aserver: ", goalMsg)
}
func RunAuthServer(udpIpPort string, secret int64) {
udpConn := common.InitUDPConn(udpIpPort)
//Initialize hash table of (udpIpPort, nonce) key-value pairs
var nonceMap concurrentMap
nonceMap.m = make(map[string]int64)
//Start listen/receive connection loop
for {
var buf [1024]byte
msgLen, clientUDPAddr, err := udpConn.ReadFromUDP(buf[:])
if err != nil {
fmt.Println("Error on ReadFromUDP: ", err)
} else {
//Start go routine to handle client, continue listening for new clients
go handleUDPConn(udpConn, clientUDPAddr, nonceMap, secret, buf[0:msgLen])
}
}
udpConn.Close()
}