// Starts the Network Client Manager. First it connects to one of the seed nodes in order to fetch the Presence List.
// Afterwards, it starts the reconnect and keepalive threads
public static void start()
{
if (running)
{
return;
}
running = true;
networkClients = new List <NetworkClient>();
PeerStorage.readPeersFile();
// Now add the seed nodes to the list
foreach (string[] addr in CoreNetworkUtils.getSeedNodes(Config.isTestNet))
{
byte[] wallet_addr = null;
if (addr[1] != null)
{
wallet_addr = Base58Check.Base58CheckEncoding.DecodePlain(addr[1]);
}
PeerStorage.addPeerToPeerList(addr[0], wallet_addr, false);
}
// Connect to a random node first
bool firstSeedConnected = false;
while (firstSeedConnected == false)
{
Peer p = PeerStorage.getRandomMasterNodeAddress();
if (p != null)
{
firstSeedConnected = connectTo(p.hostname, p.walletAddress);
}
if (firstSeedConnected == false)
{
Thread.Sleep(1000);
}
}
// Start the reconnect thread
TLC = new ThreadLiveCheck();
reconnectThread = new Thread(reconnectClients);
reconnectThread.Name = "Network_Client_Manager_Reconnect";
autoReconnect = true;
reconnectThread.Start();
}
// Starts the Network Client Manager. First it connects to one of the seed nodes in order to fetch the Presence List.
// Afterwards, it starts the reconnect and keepalive threads
public static void start()
{
if (running)
{
return;
}
running = true;
networkClients = new List <NetworkClient>();
PeerStorage.readPeersFile();
// Now add the seed nodes to the list
foreach (string addr in CoreNetworkUtils.getSeedNodes(Config.isTestNet))
{
PeerStorage.addPeerToPeerList(addr, null, false);
}
// Connect to a random node first
bool firstSeedConnected = false;
while (firstSeedConnected == false)
{
string address = PeerStorage.getRandomMasterNodeAddress();
if (address != "")
{
firstSeedConnected = connectTo(address);
}
if (firstSeedConnected == false)
{
Thread.Sleep(1000);
}
}
// Start the reconnect thread
TLC = new ThreadLiveCheck();
reconnectThread = new Thread(reconnectClients);
reconnectThread.Name = "Network_Client_Manager_Reconnect";
autoReconnect = true;
reconnectThread.Start();
}
// Returns a random new potential neighbor. Returns null if no new neighbor is found.
public static Peer scanForNeighbor()
{
Peer connectToPeer = null;
// Find only masternodes
while (connectToPeer == null)
{
bool addr_valid = true;
Peer p = PeerStorage.getRandomMasterNodeAddress();
if (p == null)
{
break;
}
// Next, check if we're connecting to a self address of this node
string[] server = p.hostname.Split(':');
if (server.Length < 2)
{
break;
}
// Resolve the hostname first
string resolved_server_name = NetworkUtils.resolveHostname(server[0]);
string resolved_server_name_with_port = resolved_server_name + ":" + server[1];
// Check if we are already connected to this address
lock (networkClients)
{
foreach (NetworkClient client in networkClients)
{
if (client.getFullAddress(true).Equals(resolved_server_name_with_port, StringComparison.Ordinal))
{
// Address is already in the client list
addr_valid = false;
break;
}
}
}
// Check if node is already in the server list
string[] connectedClients = NetworkServer.getConnectedClients(true);
for (int i = 0; i < connectedClients.Length; i++)
{
if (connectedClients[i].Equals(resolved_server_name_with_port, StringComparison.Ordinal))
{
// Address is already in the client list
addr_valid = false;
break;
}
}
if (addr_valid == false)
{
continue;
}
// Check against connecting clients list as well
lock (connectingClients)
{
foreach (string client in connectingClients)
{
if (resolved_server_name_with_port.Equals(client, StringComparison.Ordinal))
{
// Address is already in the connecting client list
addr_valid = false;
break;
}
}
}
if (addr_valid == false)
{
continue;
}
// Get all self addresses and run through them
List <string> self_addresses = CoreNetworkUtils.GetAllLocalIPAddresses();
foreach (string self_address in self_addresses)
{
// Don't connect to self
if (resolved_server_name.Equals(self_address, StringComparison.Ordinal))
{
if (server[1].Equals(string.Format("{0}", Config.serverPort), StringComparison.Ordinal))
{
addr_valid = false;
}
}
}
// If the address is valid, add it to the candidates
if (addr_valid)
{
connectToPeer = p;
}
}
return(connectToPeer);
}
// Called when receiving a keepalive network message. The PresenceList will update the appropriate entry based on the timestamp.
// Returns TRUE if it updated an entry in the PL
// Sets the out address parameter to be the KA wallet's address or null if an error occured
public static bool receiveKeepAlive(byte[] bytes, out byte[] address)
{
address = null;
// Get the current timestamp
long currentTime = Core.getCurrentTimestamp();
try
{
using (MemoryStream m = new MemoryStream(bytes))
{
using (BinaryReader reader = new BinaryReader(m))
{
int keepAliveVersion = reader.ReadInt32();
int walletLen = reader.ReadInt32();
byte[] wallet = reader.ReadBytes(walletLen);
// Assign the out address parameter
address = wallet;
string deviceid = reader.ReadString();
long timestamp = reader.ReadInt64();
string hostname = reader.ReadString();
char node_type = '0';
if (keepAliveVersion > 0)
{
node_type = reader.ReadChar();
}
int sigLen = reader.ReadInt32();
byte[] signature = reader.ReadBytes(sigLen);
//Logging.info(String.Format("[PL] KEEPALIVE request from {0}", hostname));
if (node_type == 'C' || node_type == 'R')
{
// all good, continue
}
else if (node_type == 'M' || node_type == 'H')
{
// check balance
if (Node.walletState.getWalletBalance(wallet) < CoreConfig.minimumMasterNodeFunds)
{
return(false);
}
}
else if (node_type != '0')
{
// reject everything else
return(false);
}
lock (presences)
{
Presence listEntry = presences.Find(x => x.wallet.SequenceEqual(wallet));
if (listEntry == null && wallet.SequenceEqual(Node.walletStorage.getPrimaryAddress()))
{
Logging.error(string.Format("My entry was removed from local PL, readding."));
updateEntry(curNodePresence);
listEntry = presences.Find(x => x.wallet.SequenceEqual(wallet));
}
// Check if no such wallet found in presence list
if (listEntry == null)
{
// request for additional data
using (MemoryStream mw = new MemoryStream())
{
using (BinaryWriter writer = new BinaryWriter(mw))
{
writer.Write(wallet.Length);
writer.Write(wallet);
CoreProtocolMessage.broadcastProtocolMessage(new char[] { 'M', 'R' }, ProtocolMessageCode.getPresence, mw.ToArray(), null);
}
}
return(false);
}
if (keepAliveVersion == 0)
{
// Verify the signature
if (CryptoManager.lib.verifySignature(Encoding.UTF8.GetBytes(CoreConfig.ixianChecksumLockString + "-" + deviceid + "-" + timestamp + "-" + hostname), listEntry.pubkey, signature) == false)
{
Logging.warn(string.Format("[PL] KEEPALIVE tampering for {0} {1}, incorrect Sig.", Base58Check.Base58CheckEncoding.EncodePlain(listEntry.wallet), hostname));
return(false);
}
}
else
{
// Verify the signature
if (CryptoManager.lib.verifySignature(bytes.Take(bytes.Length - sigLen - 4).ToArray(), listEntry.pubkey, signature) == false)
{
Logging.warn(string.Format("[PL] KEEPALIVE tampering for {0} {1}, incorrect Sig.", Base58Check.Base58CheckEncoding.EncodePlain(listEntry.wallet), hostname));
return(false);
}
}
PresenceAddress pa = listEntry.addresses.Find(x => x.address == hostname && x.device == deviceid);
if (pa != null)
{
// Check the node type
if (pa.lastSeenTime != timestamp)
{
// Check for outdated timestamp
if (timestamp < pa.lastSeenTime)
{
// We already have a newer timestamp for this entry
return(false);
}
// Check for tampering. Includes a +300, -30 second synchronization zone
if ((currentTime - timestamp) > 300 || (currentTime - timestamp) < -30)
{
Logging.warn(string.Format("[PL] Potential KEEPALIVE tampering for {0} {1}. Timestamp {2}", Base58Check.Base58CheckEncoding.EncodePlain(listEntry.wallet), pa.address, timestamp));
return(false);
}
// Update the timestamp
pa.lastSeenTime = timestamp;
pa.signature = signature;
if (node_type != '0')
{
if (pa.type != node_type)
{
lock (presenceCount)
{
presenceCount[pa.type]--;
if (!presenceCount.ContainsKey(node_type))
{
presenceCount.Add(node_type, 0);
}
presenceCount[node_type]++;
}
}
pa.type = node_type;
}
if (pa.type == 'M' || pa.type == 'H')
{
PeerStorage.addPeerToPeerList(hostname, wallet);
}
//Console.WriteLine("[PL] LASTSEEN for {0} - {1} set to {2}", hostname, deviceid, pa.lastSeenTime);
return(true);
}
}
else
{
if (wallet.SequenceEqual(Node.walletStorage.getPrimaryAddress()))
{
updateEntry(curNodePresence);
return(true);
}
else
{
using (MemoryStream mw = new MemoryStream())
{
using (BinaryWriter writer = new BinaryWriter(mw))
{
writer.Write(wallet.Length);
writer.Write(wallet);
CoreProtocolMessage.broadcastProtocolMessage(new char[] { 'M', 'R' }, ProtocolMessageCode.getPresence, mw.ToArray(), null);
}
}
return(false);
}
}
}
}
}
}
catch (Exception e)
{
Logging.error("Exception occured in receiveKeepAlive: " + e);
return(false);
}
return(false);
}
