TCP / IP数据包侦听器
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13-12-2019 - |
题
我已经开始做一些基本的网络编程。
我已经使用TcpClient
和TcpListener
读/写了自己的程序,并且它已经工作了。
我想设置一个侦听TCP / IP报文的程序,而无需连接。
例如,具有数据包发送应用程序将数据包发送到我的程序,使用相应的IP添加和端口号。
我还看了用Sharppcap和packet.net,但我发现的所有示例只侦听在本地找到的设备上(没有机会设置端口号和IP添加等参数)。
有人有什么建议如何去做这件事吗?
解决方案
您应该查看使用UDP协议而不是TCP / IP。
http://en.wikipedia.org/wiki/user_datagram_protocol
以下是客户端的代码:
using System.Net;
using System.Net.Sockets;
...
/// <summary>
/// Sends a sepcified number of UDP packets to a host or IP Address.
/// </summary>
/// <param name="hostNameOrAddress">The host name or an IP Address to which the UDP packets will be sent.</param>
/// <param name="destinationPort">The destination port to which the UDP packets will be sent.</param>
/// <param name="data">The data to send in the UDP packet.</param>
/// <param name="count">The number of UDP packets to send.</param>
public static void SendUDPPacket(string hostNameOrAddress, int destinationPort, string data, int count)
{
// Validate the destination port number
if (destinationPort < 1 || destinationPort > 65535)
throw new ArgumentOutOfRangeException("destinationPort", "Parameter destinationPort must be between 1 and 65,535.");
// Resolve the host name to an IP Address
IPAddress[] ipAddresses = Dns.GetHostAddresses(hostNameOrAddress);
if (ipAddresses.Length == 0)
throw new ArgumentException("Host name or address could not be resolved.", "hostNameOrAddress");
// Use the first IP Address in the list
IPAddress destination = ipAddresses[0];
IPEndPoint endPoint = new IPEndPoint(destination, destinationPort);
byte[] buffer = Encoding.ASCII.GetBytes(data);
// Send the packets
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
for(int i = 0; i < count; i++)
socket.SendTo(buffer, endPoint);
socket.Close();
}
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