本文是利用sharppcap实现网络包的捕获的小例子，实现了端口监控，数据包捕获等功能，主要用于学习分享。
什么是sharppcap？
sharppcap 是一个.net 环境下的网络包捕获框架，基于著名的 pcap/winpcap 库开发。提供了捕获、注入、分析和构建的功能，适用于 c# 和 vb net 开发语言。
sharppcap有两部分组成：1> sharppcap.dll 负责数据的捕获 2> packetdotnet.dll负责数据包的解析
思路：
通过进程名字获取对应的端口号。
sharppcap获取对应的数据包，通过解析数据包过滤相关的端口。
涉及知识点：
process 获取相关进程信息。
netstat命令：netstat -ano|find "3844" 获取进程对应的端口
sharppcap相关信息：
通过capturedevicelist的静态方法获取设备列表。
通过onpacketarrival事件接收数据包。
通过packetdotnet来解析数据包
效果图下：
sharppcap核心代码：
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/// <summary>
/// 开始捕捉
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnstart_click(object sender, eventargs e)
{
if (this.combdevice.selectedindex > -1)
{
startcapture(this.combdevice.selectedindex);
this.btnstart.enabled = false;
this.btnstop.enabled = true;
}
else {
messagebox.show(this,"请选择一个设备","提示",messageboxbuttons.ok);
}
}
/// <summary>
/// 停止捕捉
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnstop_click(object sender, eventargs e)
{
shutdown();
this.btnstop.enabled = false;
this.btnstart.enabled = true;
}
private void startcapture(int itemindex)
{
packetcount = 0;
device = capturedevicelist.instance[itemindex];
packetstrings = new queue<packetwrapper>();
bs = new bindingsource();
dgvdata.datasource = bs;
laststatisticsoutput = datetime.now;
// start the background thread
backgroundthreadstop = false;
backgroundthread = new thread(backgroundthread);
backgroundthread.start();
// setup background capture
device.onpacketarrival += new packetarrivaleventhandler(device_onpacketarrival);
device.oncapturestopped += new capturestoppedeventhandler(device_oncapturestopped);
device.open();
// tcpdump filter to capture only tcp/ip packets
string filter = "ip and tcp";
device.filter = filter;
// force an initial statistics update
capturestatistics = device.statistics;
updatecapturestatistics();
// start the background capture
device.startcapture();
btnstop.enabled = true;
}
/// <summary>
/// 设备接收事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void device_onpacketarrival(object sender, captureeventargs e)
{
// print out periodic statistics about this device
var now = datetime.now;
var interval = now - laststatisticsoutput;
if (interval > new timespan(0, 0, 2))
{
console.writeline("device_onpacketarrival: " + e.device.statistics);
capturestatistics = e.device.statistics;
statisticsuineedsupdate = true;
laststatisticsoutput = now;
}
lock (queuelock)
{
packetqueue.add(e.packet);
}
}
/// <summary>
/// 设备停止事件
/// </summary>
/// <param name="sender"></param>
/// <param name="status"></param>
private void device_oncapturestopped(object sender, capturestoppedeventstatus status)
{
if (status != capturestoppedeventstatus.completedwithouterror)
{
messagebox.show("error stopping capture", "error", messageboxbuttons.ok, messageboxicon.error);
}
}
private void updatecapturestatistics()
{
tlblstatistic.text = string.format("接收包: {0}, 丢弃包: {1}, 接口丢弃包: {2}", capturestatistics.receivedpackets,capturestatistics.droppedpackets, capturestatistics.interfacedroppedpackets);
}
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以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/hsiang/p/7696347.html