我怎样才能解析.NET UDP包？ [英] how can I parse a UDP packet in .NET?

问题描述

我怎么能解析报文中的.NET？

how can I parse a UDP packet in .NET?

我用PCap.Net捕获数据包，在这种情况下UDP数据包，我可以从PCap.net对象通过（PcapDotNet.packets.Ethernet.IpV4.Udp）访问。

I'm using PCap.Net to capture packets, in this case UDP packets, which I can access from the PCap.net object via (PcapDotNet.packets.Ethernet.IpV4.Udp).

我怎么能走的结果，UDP包，并解析呢？特别分拆DNS请求和被容纳在UDP分组内所发生的反应。

How can I take the results, the Udp packet, and parse this? In particular to unbundle DNS requests and responses that occur that are housed within a UDP packet.

有一个库，可以帮助这里？

Is there a library that could help here?

修改：为了更具体的我希望能够做的是提取DNS响应的IP地址，并使用Wireshark的将是通过基于检查：

EDIT: To be more specific what I want to be able to do is extract the IP address from the DNS response, and based on examination using Wireshark it would be by:

（一）输入：一个UDP数据包是DNS响应的有效载荷

(a) Input: Payload of a UDP packet that is a DNS response

（二）处理：解析出的UDP数据包的DNS响应部分。找到答案部分，在此找到答案记录，它的类型是A（主机地址）不是一个CNAME记录]，然后用这个答案记录获取IP地址。

(b) Processing: Parse out the DNS response portion of the UDP packet. Find the Answers portion, within this find the answer record for which the type is A (Host Address) [not a CNAME record], then with this answer record get the IP address.

（三）返回：从DNS响应的IP地址

(c) Return: The IP address from the DNS response.

推荐答案

我发现下面的项目，有code要做到这一点

I found the following project which had the code to do this

HTTP：//www.$c$cproject.com/KB/ IP / dnslookupdotnet.aspx

在特定的Response.cs类。同时注意，在code中的错误，但页面上的亮点在哪里，这是注释。

The Response.cs class in particular. Also note there is a bug in the code but the comments on the page highlight where this is.

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