简单的udp代理解决方案

Question

我正在寻找可以代理我的 udp 数据包的解决方案。我有一个客户端向服务器发送 udp 数据包。它们之间的连接非常糟糕，导致大量数据包丢失。一种解决方案是使用一个新的代理服务器，它将所有数据包从客户端重定向到目标服务器。新的代理服务器与这两个位置都有良好的连接。

到目前为止，我已经找到了 Simple UDP proxy/pipe< /a>

有一些用于此目的的工具吗？

干杯

Answer 1

有一天我还为此写了一个Python脚本。这是双向的：

https://github.com/EtiennePerot /misc-scripts/blob/master/udp-relay.py

用法：udp-relay.py localPort:remoteHost:remotePort

然后，将您的 UDP 应用程序指向 localhost:localPort 并且所有数据包都会反弹到 remoteHost:remotePort。

从 remoteHost:remotePort 发回的所有数据包都将被退回到应用程序（假设应用程序正在侦听刚刚发送数据包的端口）。

Answer 2

以下是为此目的编写的 Python 代码：

import socket
from threading import Thread

class Proxy(Thread):
    """ used to proxy single udp connection 
    """
    BUFFER_SIZE = 4096 
    def __init__(self, listening_address, forward_address):
        print " Server started on", listening_address
        Thread.__init__(self)
        self.bind = listening_address
        self.target = forward_address

    def run(self):
        # listen for incoming connections:
        target = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        target.connect(self.target)

        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        try:
            s.bind(self.bind)
        except socket.error, err:
            print "Couldn't bind server on %r" % (self.bind, )
            raise SystemExit
        while 1:
            datagram = s.recv(self.BUFFER_SIZE)
            if not datagram:
                break
            length = len(datagram)
            sent = target.send(datagram)
            if length != sent:
                print 'cannot send to %r, %r !+ %r' % (self.target, length, sent)
        s.close()


if __name__ == "__main__":
    LISTEN = ("0.0.0.0", 8008)
    TARGET = ("localhost", 5084)
    while 1:
        proxy = Proxy(LISTEN, TARGET)
        proxy.start()
        proxy.join()
        print ' [restarting] '

我使用这两个脚本来测试它。

import socket

target = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
target.connect(("localhost", 8008))
print 'sending:', target.send("test data: 123456789")

和

import socket

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(("localhost", 5084))
while 1:
    datagram = s.recv(1024)
    if not datagram:
        break
    print repr(datagram)

s.close()

Answer 3

此版本会发回一个回复。这仅对一位客户有利。

import socket
from threading import Thread

class Proxy(Thread):
    """ used to proxy single udp connection 
    """
    BUFFER_SIZE = 4096 
    def __init__(self, listening_address, forward_address):
        print " Server started on", listening_address
        Thread.__init__(self)
        self.bind = listening_address
        self.target = forward_address

    def run(self):
        # listen for incoming connections:
        target = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        target.connect(self.target)

        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        try:
            s.bind(self.bind)
        except socket.error, err:
            print "Couldn't bind server on %r" % (self.bind, )
            raise SystemExit
        while 1:
            (datagram,addr) = s.recvfrom(self.BUFFER_SIZE)
            if not datagram:
                break
            length = len(datagram)
            sent = target.send(datagram)
            if length != sent:
                print 'cannot send to %r, %r !+ %r' % (self.s, length, sent)
            datagram = target.recv(self.BUFFER_SIZE)
            if not datagram:
                break
            length = len(datagram)
            sent = s.sendto(datagram,addr)
            if length != sent:
                print 'cannot send to %r, %r !+ %r' % (self.s, length, sent)
        s.close()


if __name__ == "__main__":
    LISTEN = ("0.0.0.0", 5093)
    TARGET = ("10.12.2.26", 5093)
    while 1:
        proxy = Proxy(LISTEN, TARGET)
        proxy.start()
        proxy.join()
        print ' [restarting] '

Answer 4

这是一个工作
TCP 或 UDP 重定向器 / UDP 代理 / UDP 管道 / TCP 代理 / TCP 管道

我创建了许多不同模型的 UDP 代理连接保镖，它们似乎都使用标准 Sockets 类失去了连接，但使用 UDPClient 类这个问题完全消失了。

UDP 代理只有 25 行代码，但功能和稳定性却超乎想象

下面是如何在 TCP 和 UDP 中执行此操作的示例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net.Sockets;
using System.Diagnostics;
using System.Net;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string Address= "*PUT IP ADDRESS HERE WHERE UDP SERVER IS*";
            int UDPPort = *PUT UDP SERVER PORT HERE*;
            UdpRedirect _UdpRedirect = new UdpRedirect() { _address = Address, _Port = UDPPort};
            Thread _Thread = new Thread(_UdpRedirect.Connect);
            _Thread.Name = "UDP";
            _Thread.Start();

            int TCPPort = *PUT TCP PORT HERE FOR TCP PROXY*;       
            TcpRedirect _TcpRedirect = new TcpRedirect(Address, TCPPort);            
        }
    }
    class UdpRedirect
    {
        public string _address;
        public int _Port;
        public UdpRedirect()
        {
        }

        public void Connect()
        {
            UdpClient _UdpClient = new UdpClient(_Port);
            int? LocalPort = null;
            while (true)
            {
                IPEndPoint _IPEndPoint = null;
                byte[] _bytes = _UdpClient.Receive(ref _IPEndPoint);
                if (LocalPort == null) LocalPort = _IPEndPoint.Port;
                bool Local = IPAddress.IsLoopback(_IPEndPoint.Address);
                string AddressToSend = null;
                int PortToSend = 0;
                if (Local)
                {
                    AddressToSend = _address;
                    PortToSend = _Port;
                }
                else
                {
                    AddressToSend = "127.0.0.1";
                    PortToSend = LocalPort.Value;
                }
                _UdpClient.Send(_bytes, _bytes.Length, AddressToSend, PortToSend);
            }
        }
    }
    class TcpRedirect
    {
        public TcpRedirect(string _address, int _Port)
        {

            TcpListener _TcpListener = new TcpListener(IPAddress.Any, _Port);
            _TcpListener.Start();
            int i = 0;
            while (true)
            {
                i++;
                TcpClient _LocalSocket = _TcpListener.AcceptTcpClient();
                NetworkStream _NetworkStreamLocal = _LocalSocket.GetStream();

                TcpClient _RemoteSocket = new TcpClient(_address, _Port);
                NetworkStream _NetworkStreamRemote = _RemoteSocket.GetStream();
                Console.WriteLine("\n<<<<<<<<<connected>>>>>>>>>>>>>");
                Client _RemoteClient = new Client("remote" + i)
                {
                    _SendingNetworkStream = _NetworkStreamLocal,
                    _ListenNetworkStream = _NetworkStreamRemote,
                    _ListenSocket = _RemoteSocket
                };
                Client _LocalClient = new Client("local" + i)
                {
                    _SendingNetworkStream = _NetworkStreamRemote,
                    _ListenNetworkStream = _NetworkStreamLocal,
                    _ListenSocket = _LocalSocket
                };
            }
        }
        public class Client
        {
            public TcpClient _ListenSocket;
            public NetworkStream _SendingNetworkStream;
            public NetworkStream _ListenNetworkStream;
            Thread _Thread;
            public Client(string Name)
            {
                _Thread = new Thread(new ThreadStart(ThreadStartHander));
                _Thread.Name = Name;
                _Thread.Start();
            }
            public void ThreadStartHander()
            {
                Byte[] data = new byte[99999];
                while (true)
                {
                    if (_ListenSocket.Available > 0)
                    {
                        int _bytesReaded = _ListenNetworkStream.Read(data, 0, _ListenSocket.Available);
                        _SendingNetworkStream.Write(data, 0, _bytesReaded);
                        Console.WriteLine("(((((((" + _bytesReaded + "))))))))))" + _Thread.Name + "\n" + ASCIIEncoding.ASCII.GetString(data, 0, _bytesReaded).Replace((char)7, '?'));
                    }
                    Thread.Sleep(10);
                }
            }

        }
    }
}