private static void HandleManagerConnection(object obj)
{
TcpClient tcpClient = (TcpClient)obj;
string clientEndPoint = tcpClient.Client.RemoteEndPoint.ToString();
Console.WriteLine($"Handling a new connection from {clientEndPoint}");
using (var networkStream = tcpClient.GetStream())
{
byte[] receiveBuffer = new byte[tcpClient.ReceiveBufferSize];
// This is blocking and will wait for data to come from the client.
//
var bytesRead = networkStream.Read(receiveBuffer, 0, (int)tcpClient.ReceiveBufferSize);
Console.WriteLine("**************************** MANAGEMENT REQUEST RECEIVED *************************");
if (bytesRead == 0)
{
// Read returns 0 if the client closes the connection.
//
return;
}
var content = receiveBuffer.CopySlice(0, bytesRead);
var ms = new MemoryStream(content);
StreamReader sr = new StreamReader(ms);
String request = sr.ReadLine();
string[] tokens = request.Split(' ');
if (tokens.Length != 3)
{
throw new Exception("Invalid HTTP request line");
}
var method = tokens[0].ToUpper();
var url = tokens[1].Trim('/');
var version = tokens[2];
string line;
Dictionary <string, string> httpHeaders = new Dictionary <string, string>();
while ((line = sr.ReadLine()) != null)
{
if (line.Equals(""))
{
break;
}
int separator = line.IndexOf(':');
if (separator == -1)
{
throw new Exception("invalid http header line: " + line);
}
String name = line.Substring(0, separator);
int pos = separator + 1;
while ((pos < line.Length) && (line[pos] == ' '))
{
pos++; // strip any spaces
}
string value = line.Substring(pos, line.Length - pos);
Console.WriteLine("* Header: {0}:{1}", name, value);
httpHeaders[name.ToLower()] = value;
}
Console.WriteLine($"* URL: {url}");
int BUF_SIZE = 4096;
int content_len = 0;
MemoryStream contentMs = new MemoryStream();
if (httpHeaders.ContainsKey("content-length"))
{
content_len = Convert.ToInt32(httpHeaders["content-length"]);
if (content_len > 20000)
{
throw new Exception(String.Format("POST Content-Length({0}) too big for this simple server", content_len));
}
ms.Position = ms.Position - content_len;
var temp = new byte[ms.Length - ms.Position];
Array.Copy(ms.ToArray(), (int)ms.Position, temp, 0, (int)ms.Length - ms.Position);
BinaryReader br = new BinaryReader(ms);
if (httpHeaders.ContainsKey("content-length"))
{
byte[] buf = new byte[BUF_SIZE];
int to_read = content_len;
while (to_read > 0)
{
int numread = br.Read(buf, 0, Math.Min(BUF_SIZE, to_read));
if (numread == 0)
{
if (to_read == 0)
{
break;
}
else
{
throw new Exception("client disconnected during post");
}
}
to_read -= numread;
contentMs.Write(buf, 0, numread);
}
contentMs.Seek(0, SeekOrigin.Begin);
}
}
byte[] result = null;
if (url.StartsWith("accessories"))
{
var parts = url.Split('?');
var queryString = HttpUtility.ParseQueryString(parts[1]);
var value = int.Parse(queryString["value"]);
AccessoriesController controller = new AccessoriesController();
result = controller.Put(CurrentSession, 3, 8, value);
}
else
{
Console.WriteLine($"* Request for {url} is not yet supported!");
throw new Exception("Not Supported");
}
if (result.Length != 0)
{
CurrentlyConnectedController.GetStream().Write(result, 0, result.Length);
CurrentlyConnectedController.GetStream().Flush();
}
var returnChars = new byte[2];
returnChars[0] = 0x0D;
returnChars[1] = 0x0A;
var response = Encoding.ASCII.GetBytes("HTTP/1.1 204 OK").Concat(returnChars).ToArray();
response = response.Concat(Encoding.ASCII.GetBytes("Content-Length: 0")).Concat(returnChars).ToArray();
response = response.Concat(returnChars).ToArray();
networkStream.Write(response, 0, response.Length);
networkStream.Flush();
Console.WriteLine("**************************** EVENT SENT ******************************");
}
tcpClient.Close();
tcpClient.Dispose();
}
private static void HandleControllerConnection(object obj)
{
TcpClient tcpClient = (TcpClient)obj;
// Set keepalive to true!
//
//tcpClient.Client.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.KeepAlive, true);
string clientEndPoint = tcpClient.Client.RemoteEndPoint.ToString();
Console.WriteLine($"Handling a new controller connection from {clientEndPoint}");
ControllerSession session = new ControllerSession();
CurrentSession = session;
using (var networkStream = tcpClient.GetStream())
{
byte[] receiveBuffer = new byte[tcpClient.ReceiveBufferSize];
var keepListening = true;
while (keepListening)
{
Console.WriteLine("Waiting for more data from the client....");
// This is blocking and will wait for data to come from the client.
//
var bytesRead = networkStream.Read(receiveBuffer, 0, (int)tcpClient.ReceiveBufferSize);
Console.WriteLine("**************************** REQUEST RECEIVED *************************");
if (bytesRead == 0)
{
// Read returns 0 if the client closes the connection.
//
break;
}
var content = receiveBuffer.CopySlice(0, bytesRead);
if (session.IsVerified)
{
Console.WriteLine("* DECRYPTING REQUEST *");
var encryptionResult = new byte[0];
for (int offset = 0; offset < bytesRead;)
{
// The first type bytes represent the length of the data.
//
byte[] twoBytes = new Byte[] { content[0], content[1] };
offset += 2;
UInt16 frameLength = BitConverter.ToUInt16(twoBytes, 0);
int availableDataLength = bytesRead - offset - 16;
byte[] messageData = new byte[availableDataLength];
Buffer.BlockCopy(content, offset, messageData, 0, availableDataLength);
offset += availableDataLength;
byte[] authTag = new byte[16];
Buffer.BlockCopy(content, offset, authTag, 0, 16);
var nonce = Cnv.FromHex("00000000").Concat(BitConverter.GetBytes(session.InboundBinaryMessageCount++)).ToArray();
// Use the AccessoryToController key to decrypt the data.
//
var decryptedData = Aead.Decrypt(messageData, session.ControllerToAccessoryKey, nonce, twoBytes, authTag, Aead.Algorithm.Chacha20_Poly1305);
encryptionResult = encryptionResult.Concat(decryptedData).ToArray();
offset += (18 + frameLength);
}
content = encryptionResult;
}
var ms = new MemoryStream(content);
StreamReader sr = new StreamReader(ms);
String request = sr.ReadLine();
string[] tokens = request.Split(' ');
if (tokens.Length != 3)
{
throw new Exception("Invalid HTTP request line");
}
var method = tokens[0].ToUpper();
var url = tokens[1].Trim('/');
var version = tokens[2];
string line;
Dictionary <string, string> httpHeaders = new Dictionary <string, string>();
while ((line = sr.ReadLine()) != null)
{
if (line.Equals(""))
{
break;
}
int separator = line.IndexOf(':');
if (separator == -1)
{
throw new Exception("invalid http header line: " + line);
}
String name = line.Substring(0, separator);
int pos = separator + 1;
while ((pos < line.Length) && (line[pos] == ' '))
{
pos++; // strip any spaces
}
string value = line.Substring(pos, line.Length - pos);
Console.WriteLine("* Header: {0}:{1}", name, value);
httpHeaders[name.ToLower()] = value;
}
Console.WriteLine($"* URL: {url}");
int BUF_SIZE = 4096;
int content_len = 0;
MemoryStream contentMs = new MemoryStream();
if (httpHeaders.ContainsKey("content-length"))
{
content_len = Convert.ToInt32(httpHeaders["content-length"]);
if (content_len > 20000)
{
throw new Exception(String.Format("POST Content-Length({0}) too big for this simple server", content_len));
}
ms.Position = ms.Position - content_len;
var temp = new byte[ms.Length - ms.Position];
Array.Copy(ms.ToArray(), (int)ms.Position, temp, 0, (int)ms.Length - ms.Position);
BinaryReader br = new BinaryReader(ms);
if (httpHeaders.ContainsKey("content-length"))
{
byte[] buf = new byte[BUF_SIZE];
int to_read = content_len;
while (to_read > 0)
{
int numread = br.Read(buf, 0, Math.Min(BUF_SIZE, to_read));
if (numread == 0)
{
if (to_read == 0)
{
break;
}
else
{
throw new Exception("client disconnected during post");
}
}
to_read -= numread;
contentMs.Write(buf, 0, numread);
}
contentMs.Seek(0, SeekOrigin.Begin);
}
}
Tuple <string, byte[]> result = null;
if (url == "pair-setup")
{
PairSetupController controller = new PairSetupController();
result = controller.Post(contentMs.ToArray());
}
else if (url == "pair-verify")
{
PairVerifyController controller = new PairVerifyController();
result = controller.Post(contentMs.ToArray(), session);
}
else if (url == "accessories")
{
AccessoriesController controller = new AccessoriesController();
result = controller.Get(session);
}
else if (url == "pairings")
{
PairingsController controller = new PairingsController();
result = controller.Post(contentMs.ToArray(), session);
}
else if (url.StartsWith("characteristics"))
{
// The url will contain a query string e.g. id=1.1 meaning accessoryId 1 with characteristic 1
//
CharacteristicsController controller = new CharacteristicsController();
if (method == "PUT")
{
result = controller.Put(contentMs.ToArray(), session);
}
else if (method == "GET")
{
var parts = url.Split('?');
var queryStringing = parts[1].Replace("id=", "");
var accessoriesParts = queryStringing.Split(',');
List <Tuple <int, int> > accessories = new List <Tuple <int, int> >();
foreach (var accessoryString in accessoriesParts)
{
var accessoryParts = accessoryString.Split('.');
var aid = int.Parse(accessoryParts[0]);
var iid = int.Parse(accessoryParts[1]);
accessories.Add(new Tuple <int, int>(aid, iid));
}
result = controller.Get(accessories, session);
}
}
else
{
Console.WriteLine($"* Request for {url} is not yet supported!");
throw new Exception("Not Supported");
}
// Construct the response. We're assuming 100% success, all of the time, for now.
//
var response = new byte[0];
var returnChars = new byte[2];
returnChars[0] = 0x0D;
returnChars[1] = 0x0A;
var contentLength = $"Content-Length: {result.Item2.Length}";
if (result.Item2.Length == 0)
{
response = response.Concat(Encoding.ASCII.GetBytes("HTTP/1.1 204 No Content")).Concat(returnChars).ToArray();
}
else
{
response = response.Concat(Encoding.ASCII.GetBytes("HTTP/1.1 200 OK")).Concat(returnChars).ToArray();
response = response.Concat(Encoding.ASCII.GetBytes(contentLength)).Concat(returnChars).ToArray();
response = response.Concat(Encoding.ASCII.GetBytes($"Content-Type: {result.Item1}")).Concat(returnChars).ToArray();
}
response = response.Concat(returnChars).ToArray();
response = response.Concat(result.Item2).ToArray();
if (session.IsVerified && !session.SkipFirstEncryption)
{
// We need to decrypt the request!
//
Console.WriteLine("* ENCRYPTING RESPONSE");
var resultData = new byte[0];
for (int offset = 0; offset < response.Length;)
{
int length = Math.Min(response.Length - offset, 1024);
var dataLength = BitConverter.GetBytes((short)length);
resultData = resultData.Concat(dataLength).ToArray();
var nonce = Cnv.FromHex("00000000").Concat(BitConverter.GetBytes(session.OutboundBinaryMessageCount++)).ToArray();
var dataToEncrypt = new byte[length];
Array.Copy(response, offset, dataToEncrypt, 0, length);
// Use the AccessoryToController key to decrypt the data.
//
var authTag = new byte[16];
var encryptedData = Aead.Encrypt(out authTag, dataToEncrypt, session.AccessoryToControllerKey, nonce, dataLength, Aead.Algorithm.Chacha20_Poly1305);
resultData = resultData.Concat(encryptedData).Concat(authTag).ToArray();
offset += length;
}
response = resultData;
networkStream.Write(response, 0, response.Length);
networkStream.Flush();
}
else
{
networkStream.Write(response, 0, response.Length);
networkStream.Flush();
if (session.SkipFirstEncryption)
{
session.SkipFirstEncryption = false;
}
}
Console.WriteLine("**************************** RESPONSE SENT ******************************");
}
}
Console.WriteLine($"Connection from {clientEndPoint} will be closed!");
tcpClient.Close();
tcpClient.Dispose();
}