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NTRIPServer.cs
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NTRIPServer.cs
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using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using NTRIPCaster.Configs;
namespace NTRIPCaster.Server {
public class NTRIPServer : IDisposable {
private Config Config;
private TcpListener Listener;
private IDictionary<string, ImmutableList<ClientConnection>> Clients;
private object lockObj = new object();
private Thread ServerThread;
private volatile bool shouldStop = false;
public NTRIPServer(Config config) {
this.Config = config;
this.Listener = new TcpListener(IPAddress.Parse(config.ServerAddress), config.ServerPort);
this.Clients = new Dictionary<string, ImmutableList<ClientConnection>>();
foreach (var source in config.Sources) {
this.Clients.Add(source.Mountpoint, ImmutableList.Create<ClientConnection>());
}
}
public void Start() {
ServerThread = new Thread(() => ProcessRequests());
ServerThread.Start();
}
public void Stop() {
shouldStop = true;
Listener.Stop();
if (ServerThread != null) {
ServerThread.Abort();
ServerThread.Join(TimeSpan.FromSeconds(10));
}
Environment.Exit(0);
}
public IEnumerable<ClientConnection> GetClients(string mountpoint) {
return Clients[mountpoint];
}
public void AddClient(ClientConnection client) {
Console.WriteLine($"Add Client: {client.Id}");
lock(lockObj) {
this.Clients[client.Mountpoint] = this.Clients[client.Mountpoint].Add(client);
}
}
public void RemoveClient(ClientConnection client) {
Console.WriteLine($"Remove Client: {client.Id}");
lock (lockObj) {
this.Clients[client.Mountpoint] = this.Clients[client.Mountpoint].Remove(client);
}
}
private void ProcessRequests() {
Listener.Start();
Console.WriteLine($"Server is listening at {Listener.LocalEndpoint}");
while (!shouldStop) {
try {
var socket = Listener.AcceptSocket();
var thread = new Thread(() => {
try {
ProcessRequest(socket);
} catch (Exception ex) {
Console.WriteLine(ex);
}
});
thread.IsBackground = true;
thread.Start();
} catch (SocketException ex) {
Console.WriteLine($"SocketException: {ex.Message}");
}
}
Console.WriteLine($"Stopped listening");
}
private void ProcessRequest(Socket socket) {
var buffer = new byte[1024];
var bytesCount = socket.Receive(buffer);
var headersText = Encoding.ASCII.GetString(buffer, 0, bytesCount);
try {
var parsedHeaders = ParsedHttpHeaders.Parse(headersText);
if (!parsedHeaders.IsNTRIP) {
var response = "HTTP/1.0 200 OK\r\nServer: NTRIPCaster\r\nContent-Type: text/plain\r\n\r\nThis is a NTRIP Caster";
SendToSocket(socket, response);
socket.Close();
} else if (parsedHeaders.Mountpoint == "") {
// Send Sourcetable
SendSourcetable(socket);
socket.Close();
} else if (parsedHeaders.IsSource) {
ProcessSource(socket, parsedHeaders);
} else {
ProcessClient(socket, parsedHeaders);
}
} catch (Exception) {
// TODO: error handling
socket.Close();
}
}
private void ProcessSource(Socket socket, ParsedHttpHeaders parsedHeaders) {
// Check Mountpoint
var source = Config.Sources.FirstOrDefault(x => x.Mountpoint == parsedHeaders.Mountpoint);
if (source == null) {
SendSourcetable(socket);
socket.Close();
return;
}
//// Check if there is another Server
//if (Servers[parsedHeaders.Mountpoint] != null) {
// SendToSocket(socket, "ERROR - Mountpoint already in use"); // Check behavior
// socket.Close();
// return;
//}
// Check Login
if (!source.Password.Equals(parsedHeaders.Password, StringComparison.OrdinalIgnoreCase)) {
SendToSocket(socket, "ERROR - Bad Password");
socket.Close();
return;
}
// Read Data
socket.Send(Encoding.ASCII.GetBytes("ICY 200 OK\r\n"));
Console.WriteLine($"New Server: {socket.RemoteEndPoint}");
var server = new ServerConnection(socket, parsedHeaders.Mountpoint, this);
server.StartProcessing();
}
private void ProcessClient(Socket socket, ParsedHttpHeaders parsedHeaders) {
// Check Mountpoint
var source = Config.Sources.FirstOrDefault(x => x.Mountpoint == parsedHeaders.Mountpoint);
if (source == null) {
SendSourcetable(socket);
socket.Close();
return;
}
// Check Login
var user = Config.Users.FirstOrDefault(x => x.Name.Equals(parsedHeaders.Username, StringComparison.OrdinalIgnoreCase));
if (!source.AuthRequired ||
(user != null && user.Password.Equals(parsedHeaders.Password, StringComparison.OrdinalIgnoreCase) && user.Mountpoints.Contains(parsedHeaders.Mountpoint))) {
socket.Send(Encoding.ASCII.GetBytes("ICY 200 OK\r\n"));
socket.SendTimeout = 1000;
var client = new ClientConnection(socket, parsedHeaders.Mountpoint, parsedHeaders.Username);
client.StrartProcessing();
AddClient(client);
} else {
SendToSocket(socket, "ERROR - Bad Password");
socket.Close();
}
}
private void SendSourcetable(Socket socket) {
var table = new StringBuilder();
foreach (var source in Config.Sources) {
table.Append("STR;");
table.Append(source.Mountpoint); table.Append(";"); // Mountpoint
table.Append(source.Identifier); table.Append(";"); // Identifier
table.Append(source.Format); table.Append(";;"); // Format (No details)
table.Append((int)source.Carrier); table.Append(";"); // Carrier
table.Append(source.NavSystem); table.Append(";"); // NavSystem
table.Append(source.Network); table.Append(";"); // Ref-Network
table.Append(source.Country); table.Append(";"); // Country
table.Append(source.Latitude.ToString("0.00")); table.Append(";"); // Latitude
table.Append(source.Longitude.ToString("0.00")); table.Append(";"); // Longitude
table.Append("0;"); // Client doesn't have to send NMEA
table.Append("0;"); // Single Base Solution
table.Append("Unknown;"); // Generator
table.Append("none;"); // Compression/Encryption
table.Append(source.AuthRequired ? "B" : "N"); table.Append(";"); // Basic Authentication
table.Append("N;"); // No fee
table.Append("9600;"); // Bitrate
table.Append("\r\n");
}
var builder = new StringBuilder();
builder.Append("SOURCETABLE 200 OK\r\n");
builder.Append("Server: NTRIP Caster/1.0\r\n");
builder.Append("Conent-Type: text/plain\r\n");
builder.Append($"Conent-Length: #{table.Length}\r\n");
builder.Append("\r\n");
builder.Append(table.ToString());
builder.Append("ENDSOURCETABLE\r\n");
SendToSocket(socket, builder.ToString());
}
private void SendToSocket(Socket socket, string str) {
socket.Send(Encoding.ASCII.GetBytes(str));
}
public void Dispose() {
throw new NotImplementedException();
}
class ParsedHttpHeaders {
public string Mountpoint;
public string Username;
public string Password;
public bool IsSource;
public string Agent;
public bool IsNTRIP { get { return Agent.Contains("NTRIP"); } }
public static ParsedHttpHeaders Parse(string headers) {
var parsedHeaders = new ParsedHttpHeaders();
foreach (var header in headers.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries)) {
if (header.StartsWith("GET ", StringComparison.Ordinal)) {
// HTTP GET
parsedHeaders.Mountpoint = NormalizeMountpoint(header.Split(new char[] { ' ' })[1]);
} else if (header.StartsWith("Authorization:", StringComparison.Ordinal)) {
// Basic Auth
var authorizationParts = header.Split(new char[] { ' ' });
if (authorizationParts.Length == 2 && authorizationParts[0].Equals("Basic", StringComparison.OrdinalIgnoreCase)) {
var usernamePassword = DecodeBase64(authorizationParts[1]).Split(new char[] { ':' });
if (usernamePassword.Length == 2) {
parsedHeaders.Username = usernamePassword[0];
parsedHeaders.Password = usernamePassword[1];
}
}
} else if (header.StartsWith("SOURCE", StringComparison.Ordinal)) {
// Source
parsedHeaders.IsSource = true;
var sourceParts = header.Split(new char[] { ' ' });
if (sourceParts.Length == 3) {
parsedHeaders.Password = sourceParts[1];
parsedHeaders.Mountpoint = NormalizeMountpoint(sourceParts[2]);
}
} else if (header.StartsWith("User-Agent:", StringComparison.Ordinal)) {
parsedHeaders.Agent = header.Substring("User-Agent:".Length).TrimStart();
} else if (header.StartsWith("Source-Agent:", StringComparison.Ordinal)) {
parsedHeaders.Agent = header.Substring("Source-Agent:".Length).TrimStart();
} else {
Console.WriteLine("ignore header: " + header);
}
}
return parsedHeaders;
}
private static string DecodeBase64(string base64String) {
var bytes = System.Convert.FromBase64String(base64String);
return Encoding.UTF8.GetString(bytes);
}
private static string NormalizeMountpoint(string mountpoint) {
if (mountpoint == null) {
return String.Empty;
}
return mountpoint.ToLowerInvariant().TrimStart(new char[] { '/' });
}
}
}
}