public void TryParse_Returns_False_On_Code_Mismatch()
{
var msg = new List <byte>();
msg.AddRange(BitConverter.GetBytes(0)); // overall length, ignored for this test.
msg.Add((byte)MessageCode.Initialization.PierceFirewall);
var r = PeerInit.TryFromByteArray(msg.ToArray(), out var result);
Assert.False(r);
Assert.Null(result);
}
public void TryParse_Returns_False_On_Missing_Data(string username, char type)
{
var msg = new List <byte>();
msg.AddRange(BitConverter.GetBytes(0)); // overall length, ignored for this test.
msg.Add((byte)MessageCode.Initialization.PeerInit);
msg.AddRange(BitConverter.GetBytes(3)); // name len
msg.AddRange(Encoding.ASCII.GetBytes(username)); // name
msg.AddRange(BitConverter.GetBytes(1)); // type len
msg.AddRange(Encoding.ASCII.GetBytes(type.ToString(CultureInfo.InvariantCulture))); // type
// omit token
var r = PeerInit.TryFromByteArray(msg.ToArray(), out var result);
Assert.False(r);
Assert.Null(result);
}
public void TryParse_Returns_Expected_Data(string username, char type, int token)
{
var msg = new List <byte>();
msg.AddRange(BitConverter.GetBytes(0)); // overall length, ignored for this test.
msg.Add((byte)MessageCode.Initialization.PeerInit);
msg.AddRange(BitConverter.GetBytes(username.Length)); // name len
msg.AddRange(Encoding.ASCII.GetBytes(username)); // name
msg.AddRange(BitConverter.GetBytes(1)); // type len
msg.AddRange(Encoding.ASCII.GetBytes(type.ToString(CultureInfo.InvariantCulture))); // type
msg.AddRange(BitConverter.GetBytes(token));
// omit token
var r = PeerInit.TryFromByteArray(msg.ToArray(), out var result);
Assert.True(r);
Assert.NotNull(result);
Assert.Equal(username, result.Username);
Assert.Equal(type.ToString(CultureInfo.InvariantCulture), result.ConnectionType);
Assert.Equal(token, result.Token);
}
/// <summary>
/// Handle <see cref="IListener.Accepted"/> events.
/// </summary>
/// <param name="sender">The originating <see cref="IListener"/> instance.</param>
/// <param name="connection">The accepted connection.</param>
public async void HandleConnection(object sender, IConnection connection)
{
Diagnostic.Debug($"Accepted incoming connection from {connection.IPEndPoint.Address}:{SoulseekClient.Listener.Port} (id: {connection.Id})");
try
{
var lengthBytes = await connection.ReadAsync(4).ConfigureAwait(false);
var length = BitConverter.ToInt32(lengthBytes, 0);
var bodyBytes = await connection.ReadAsync(length).ConfigureAwait(false);
byte[] message = lengthBytes.Concat(bodyBytes).ToArray();
if (PeerInit.TryFromByteArray(message, out var peerInit))
{
// this connection is the result of an unsolicited connection from the remote peer, either to request info or
// browse, or to send a file.
Diagnostic.Debug($"PeerInit for connection type {peerInit.ConnectionType} received from {peerInit.Username} ({connection.IPEndPoint.Address}:{SoulseekClient.Listener.Port}) (id: {connection.Id})");
if (peerInit.ConnectionType == Constants.ConnectionType.Peer)
{
await SoulseekClient.PeerConnectionManager.AddMessageConnectionAsync(
peerInit.Username,
connection).ConfigureAwait(false);
}
else if (peerInit.ConnectionType == Constants.ConnectionType.Transfer)
{
var(transferConnection, remoteToken) = await SoulseekClient.PeerConnectionManager.AddTransferConnectionAsync(
peerInit.Username,
peerInit.Token,
connection).ConfigureAwait(false);
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.DirectTransfer, peerInit.Username, remoteToken), transferConnection);
}
else if (peerInit.ConnectionType == Constants.ConnectionType.Distributed)
{
await SoulseekClient.DistributedConnectionManager.AddChildConnectionAsync(
peerInit.Username,
connection).ConfigureAwait(false);
}
}
else if (PierceFirewall.TryFromByteArray(message, out var pierceFirewall))
{
// this connection is the result of a ConnectToPeer request sent to the user, and the incoming message will
// contain the token that was provided in the request. Ensure this token is among those expected, and use it
// to determine the username of the remote user.
if (SoulseekClient.PeerConnectionManager.PendingSolicitations.TryGetValue(pierceFirewall.Token, out var peerUsername))
{
Diagnostic.Debug($"Peer PierceFirewall with token {pierceFirewall.Token} received from {peerUsername} ({connection.IPEndPoint.Address}:{SoulseekClient.Listener.Port}) (id: {connection.Id})");
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.SolicitedPeerConnection, peerUsername, pierceFirewall.Token), connection);
}
else if (SoulseekClient.DistributedConnectionManager.PendingSolicitations.TryGetValue(pierceFirewall.Token, out var distributedUsername))
{
Diagnostic.Debug($"Distributed PierceFirewall with token {pierceFirewall.Token} received from {distributedUsername} ({connection.IPEndPoint.Address}:{SoulseekClient.Listener.Port}) (id: {connection.Id})");
SoulseekClient.Waiter.Complete(new WaitKey(Constants.WaitKey.SolicitedDistributedConnection, distributedUsername, pierceFirewall.Token), connection);
}
else
{
throw new ConnectionException($"Unknown PierceFirewall attempt with token {pierceFirewall.Token} from {connection.IPEndPoint.Address}:{connection.IPEndPoint.Port} (id: {connection.Id})");
}
}
else
{
throw new ConnectionException($"Unrecognized initialization message: {BitConverter.ToString(message)} ({message.Length} bytes, id: {connection.Id})");
}
}
catch (Exception ex)
{
Diagnostic.Debug($"Failed to initialize direct connection from {connection.IPEndPoint.Address}:{connection.IPEndPoint.Port}: {ex.Message}");
connection.Disconnect(exception: ex);
connection.Dispose();
}
}