// Update a presence entry. If the wallet address is not found, it creates a new entry in the Presence List.
// If the wallet address is found in the presence list, it adds any new addresses from the specified presence.
public static Presence updateEntry(Presence presence, bool return_presence_only_if_updated = false)
{
if (presence == null)
{
return(null);
}
bool updated = false;
long currentTime = Clock.getNetworkTimestamp();
lock (presences)
{
Presence pr = presences.Find(x => x.wallet.SequenceEqual(presence.wallet));
if (pr != null)
{
lock (pr)
{
// Go through all addresses and add any missing ones
foreach (PresenceAddress local_addr in presence.addresses)
{
long lTimestamp = local_addr.lastSeenTime;
int expiration_time = CoreConfig.serverPresenceExpiration;
if (local_addr.type == 'C')
{
expiration_time = CoreConfig.clientPresenceExpiration;
}
// Check for tampering. Includes a +300, -30 second synchronization zone
if ((currentTime - lTimestamp) > expiration_time)
{
Logging.warn(string.Format("[PL] Received expired presence for {0} {1}. Skipping; {2} - {3}", Crypto.hashToString(pr.wallet), local_addr.address, currentTime, lTimestamp));
continue;
}
if ((currentTime - lTimestamp) < -30)
{
Logging.warn(string.Format("[PL] Potential presence tampering for {0} {1}. Skipping; {2} - {3}", Crypto.hashToString(pr.wallet), local_addr.address, currentTime, lTimestamp));
continue;
}
PresenceAddress addr = pr.addresses.Find(x => x.device == local_addr.device);
if (addr != null)
{
if (addr.lastSeenTime < local_addr.lastSeenTime)
{
if (local_addr.signature != null)
{
addr.version = local_addr.version;
addr.address = local_addr.address;
addr.lastSeenTime = local_addr.lastSeenTime;
addr.signature = local_addr.signature;
updated = true;
}
if (addr.type == 'M' || addr.type == 'H')
{
PeerStorage.addPeerToPeerList(addr.address, presence.wallet);
}
//Console.WriteLine("[PL] Last time updated for {0}", addr.device);
}
}
else
{
// Add the address if it's not found
//Logging.info("[PL] Adding new address for {0}", presence.wallet);
pr.addresses.Add(local_addr);
if (local_addr.type == 'M' || local_addr.type == 'H')
{
PeerStorage.addPeerToPeerList(local_addr.address, presence.wallet);
}
lock (presenceCount)
{
if (!presenceCount.ContainsKey(local_addr.type))
{
presenceCount.Add(local_addr.type, 0);
}
presenceCount[local_addr.type]++;
}
updated = true;
}
}
if (!updated && return_presence_only_if_updated)
{
return(null);
}
else
{
return(pr);
}
}
}
else
{
// Insert a new entry
//Console.WriteLine("[PL] Adding new entry for {0}", presence.wallet);
foreach (PresenceAddress pa in presence.addresses)
{
if (pa.type == 'M' || pa.type == 'H')
{
PeerStorage.addPeerToPeerList(pa.address, presence.wallet);
}
lock (presenceCount)
{
if (!presenceCount.ContainsKey(pa.type))
{
presenceCount.Add(pa.type, 0);
}
presenceCount[pa.type]++;
}
updated = true;
}
if (updated)
{
presences.Add(presence);
}
if (!updated && return_presence_only_if_updated)
{
return(null);
}
else
{
return(presence);
}
}
}
}
/// <summary>
/// Processes a Hello Ixian protocol message and updates the `PresenceList` as appropriate.
/// </summary>
/// <remarks>
/// This function should normally be called from `NetworkProtocol.parseProtocolMessage()`
/// </remarks>
/// <param name="endpoint">Remote endpoint from which the message was received.</param>
/// <param name="reader">Reader object placed at the beginning of the hello message data.</param>
/// <returns>True if the message was formatted properly and accepted.</returns>
public static bool processHelloMessageV6(RemoteEndpoint endpoint, BinaryReader reader, bool set_hello_received = true)
{
// Node already has a presence
if (endpoint.presence != null)
{
// Ignore the hello message in this case
return(false);
}
// Another layer to catch any incompatible node exceptions for the hello message
try
{
int protocol_version = (int)reader.ReadIxiVarUInt();
endpoint.version = protocol_version;
Logging.info("Received Hello: Node version {0}", protocol_version);
// Check for incompatible nodes
if (protocol_version < 6)
{
Logging.warn("Hello: Connected node version ({0}) is too old! Upgrade the node.", protocol_version);
sendBye(endpoint, ProtocolByeCode.deprecated, string.Format("Your node version is too old. Should be at least {0} is {1}", CoreConfig.protocolVersion, protocol_version), CoreConfig.protocolVersion.ToString(), true);
return(false);
}
int addrLen = (int)reader.ReadIxiVarUInt();
byte[] addr = reader.ReadBytes(addrLen);
if (addrLen > 70)
{
Logging.error("Hello: Invalid address from {0} - {1}.", endpoint.getFullAddress(true), Base58Check.Base58CheckEncoding.EncodePlain(addr));
sendBye(endpoint, ProtocolByeCode.rejected, "Invalid address", "", true);
return(false);
}
bool test_net = reader.ReadBoolean();
char node_type = reader.ReadChar();
string node_version = reader.ReadString();
if (node_version.Length > 20)
{
Logging.error("Hello: Invalid node version from {0} - {1}.", endpoint.getFullAddress(true), node_version);
sendBye(endpoint, ProtocolByeCode.rejected, "Invalid Node Version", "", true);
return(false);
}
int device_id_len = (int)reader.ReadIxiVarUInt();
byte[] device_id = reader.ReadBytes(device_id_len);
if (device_id_len > 32)
{
Logging.error("Hello: Invalid device id from {0} - {1}.", endpoint.getFullAddress(true), Crypto.hashToString(device_id));
sendBye(endpoint, ProtocolByeCode.rejected, "Invalid Device ID", "", true);
return(false);
}
int pkLen = (int)reader.ReadIxiVarUInt();
byte[] pubkey = null;
if (pkLen > 0)
{
pubkey = reader.ReadBytes(pkLen);
}
endpoint.serverPubKey = pubkey;
int port = (int)reader.ReadIxiVarInt();
long timestamp = reader.ReadIxiVarInt();
int sigLen = (int)reader.ReadIxiVarUInt();
byte[] signature = reader.ReadBytes(sigLen);
int challenge = 0;
bool in_hello = false;
if (endpoint.GetType() != typeof(NetworkClient))
{
challenge = (int)reader.ReadIxiVarUInt();
in_hello = true;
}
// Check the testnet designator and disconnect on mismatch
if (test_net != IxianHandler.isTestNet)
{
Logging.warn("Hello: Rejected node {0} due to incorrect testnet designator: {1}", endpoint.fullAddress, test_net);
sendBye(endpoint, ProtocolByeCode.incorrectNetworkType, string.Format("Incorrect testnet designator: {0}. Should be {1}", test_net, IxianHandler.isTestNet), test_net.ToString(), true);
return(false);
}
// Check the address and pubkey and disconnect on mismatch
if (!addr.SequenceEqual((new Address(pubkey)).address))
{
Logging.warn("Hello: Pubkey and address do not match.");
sendBye(endpoint, ProtocolByeCode.authFailed, "Pubkey and address do not match.", "", true);
return(false);
}
endpoint.incomingPort = port;
if (PeerStorage.isBlacklisted(addr) || PeerStorage.isBlacklisted(endpoint.getFullAddress(true)))
{
Logging.warn("Hello: Connected node is blacklisted ({0} - {1}).", endpoint.getFullAddress(true), Base58Check.Base58CheckEncoding.EncodePlain(addr));
sendBye(endpoint, ProtocolByeCode.rejected, "Blacklisted", "", true);
return(false);
}
// Verify the signature
if (node_type == 'C')
{
// TODO: verify if the client is connectable, then if connectable, check if signature verifies
/*if (CryptoManager.lib.verifySignature(Encoding.UTF8.GetBytes(ConsensusConfig.ixianChecksumLockString + "-" + device_id + "-" + timestamp + "-" + endpoint.getFullAddress(true)), pubkey, signature) == false)
* {
* CoreProtocolMessage.sendBye(endpoint, ProtocolByeCode.incorrectIp, "Verify signature failed in hello message, likely an incorrect IP was specified. Detected IP:", endpoint.address);
* Logging.warn(string.Format("Connected node used an incorrect signature in hello message, likely an incorrect IP was specified. Detected IP: {0}", endpoint.address));
* return false;
* }*/
// TODO store the full address if connectable
// Store the presence address for this remote endpoint
endpoint.presenceAddress = new PresenceAddress(device_id, "", node_type, node_version, Clock.getNetworkTimestamp() - CoreConfig.clientKeepAliveInterval, null);
}
else
{
using (MemoryStream mSig = new MemoryStream(1024))
{
using (BinaryWriter sigWriter = new BinaryWriter(mSig))
{
sigWriter.Write(ConsensusConfig.ixianChecksumLock);
sigWriter.Write(device_id);
sigWriter.Write(timestamp);
sigWriter.Write(endpoint.getFullAddress(true));
if (in_hello)
{
sigWriter.Write(challenge);
}
else
{
sigWriter.Write(endpoint.challenge);
}
}
if (!CryptoManager.lib.verifySignature(mSig.ToArray(), pubkey, signature))
{
sendBye(endpoint, ProtocolByeCode.incorrectIp, "Verify signature failed in hello message, likely an incorrect IP was specified. Detected IP:", endpoint.address);
Logging.warn("Hello: Connected node used an incorrect signature in hello message, likely an incorrect IP was specified. Detected IP: {0}", endpoint.address);
return(false);
}
}
// Store the presence address for this remote endpoint
endpoint.presenceAddress = new PresenceAddress(device_id, endpoint.getFullAddress(true), node_type, node_version, Clock.getNetworkTimestamp() - CoreConfig.serverKeepAliveInterval, null);
}
// if we're a client update the network time difference
if (endpoint.GetType() == typeof(NetworkClient))
{
long timeDiff = endpoint.calculateTimeDifference();
// amortize +- 2 seconds
if (timeDiff >= -2 && timeDiff <= 2)
{
timeDiff = 0;
}
((NetworkClient)endpoint).timeDifference = timeDiff;
// Check the address and local address and disconnect on mismatch
if (endpoint.serverWalletAddress != null && !addr.SequenceEqual(endpoint.serverWalletAddress))
{
Logging.warn("Hello: Local address mismatch, possible Man-in-the-middle attack.");
sendBye(endpoint, ProtocolByeCode.addressMismatch, "Local address mismatch.", "", true);
return(false);
}
PeerStorage.updateLastConnected(endpoint.getFullAddress(true));
}
// Create a temporary presence with the client's address and device id
Presence presence = new Presence(addr, pubkey, null, endpoint.presenceAddress);
if (endpoint.GetType() != typeof(NetworkClient))
{
// we're the server
if (node_type == 'M' || node_type == 'H' || node_type == 'R')
{
if (node_type != 'R')
{
// Check the wallet balance for the minimum amount of coins
IxiNumber balance = IxianHandler.getWalletBalance(addr);
if (balance < ConsensusConfig.minimumMasterNodeFunds)
{
Logging.warn("Hello: Rejected master node {0} due to insufficient funds: {1}", endpoint.getFullAddress(), balance.ToString());
sendBye(endpoint, ProtocolByeCode.insufficientFunds, string.Format("Insufficient funds. Minimum is {0}", ConsensusConfig.minimumMasterNodeFunds), balance.ToString(), true);
return(false);
}
}
// Limit to one IP per masternode
// TODO TODO TODO - think about this and do it properly
/*string[] hostname_split = hostname.Split(':');
* if (PresenceList.containsIP(hostname_split[0], 'M'))
* {
* using (MemoryStream m2 = new MemoryStream())
* {
* using (BinaryWriter writer = new BinaryWriter(m2))
* {
* writer.Write(string.Format("This IP address ( {0} ) already has a masternode connected.", hostname_split[0]));
* Logging.info(string.Format("Rejected master node {0} due to duplicate IP address", hostname));
* socket.Send(prepareProtocolMessage(ProtocolMessageCode.bye, m2.ToArray()), SocketFlags.None);
* socket.Disconnect(true);
* return;
* }
* }
* }*/
if (!checkNodeConnectivity(endpoint))
{
return(false);
}
}
sendHelloMessageV6(endpoint, true, challenge);
if (set_hello_received)
{
endpoint.helloReceived = true;
}
}
// Retrieve the final presence entry from the list (or create a fresh one)
endpoint.presence = PresenceList.updateEntry(presence);
}
catch (Exception e)
{
// Disconnect the node in case of any reading errors
Logging.warn("Hello: Exception occured in Hello Message {0}", e.ToString());
sendBye(endpoint, ProtocolByeCode.deprecated, "Something went wrong during hello, make sure you're running the latest version of Ixian DLT.", "");
return(false);
}
if (NetworkClientManager.getConnectedClients().Count() == 1)
{
PresenceList.forceSendKeepAlive = true;
}
return(true);
}
