如何使用 tcpdump 捕获所有 HTTP 数据包 [英] How to capture all the HTTP packets using tcpdump

问题描述

我想用一些参数运行tcpdump(还是不知道用什么)，然后加载stackoverflow.com页面.

I want to run tcpdump with some parameters (still don't know what to use), then load the stackoverflow.com page.

输出应该是 HTTP 通信.后来我想把它当作一个shell脚本，所以每当我想检查站点site.com的HTTP通信时，我就可以运行script.sh site.com.

Output should be the HTTP communication. Later, I want to use it as a shell script, so whenever I want to check the HTTP communication of a site site.com, I just can run script.sh site.com.

HTTP 通信应该足够简单.像这样:

The HTTP communication should be simple enough. Like this:

GET /questions/9241391/how-to-capture-all-the-http-communication-data-using-tcp-dump
Host: stackoverflow.com
... 
...

HTTP/1.1 200 OK
Cache-Control: public, max-age=60
Content-Length: 35061
Content-Type: text/html; charset=utf-8
Expires: Sat, 11 Feb 2012 15:36:46 GMT
Last-Modified: Sat, 11 Feb 2012 15:35:46 GMT
Vary: *
Date: Sat, 11 Feb 2012 15:35:45 GMT


....
decoded deflated data
....

现在，我应该与 tcpdump 一起使用哪些选项来捕获它?

Now, which options should I use with tcpdump to capture it?

推荐答案

可以通过ngrep

ngrep -q -d eth1 -W byline host stackoverflow.com and port 80 
       ^  ^       ^         ^        
       |  |       |         |
       |  |       |         |
       |  |       |         v
       |  |       |         filter expression
       |  |       |         
       |  |       +-->  -W  is set the dump format ("normal", "byline", "single", "none")
       |  |
       |  +---------->  -d  is use specified device instead of the pcap default
       |
       +------------->  -q  is be quiet ("don't print packet reception hash marks")

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