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  Linux command line under HTTP traffic sniffing tool: httpry
  Add Date : 2017-08-31      
  Suppose for some reason, you need to sniff traffic HTTP sites (such as HTTP requests and responses). For example, you might test a web server experimental features, or you are debugging for a web application or RESTful service, or you're a PAC (proxy auto config) troubleshooting or looking for a site to download malicious software. Whatever the reason, in these circumstances, the HTTP traffic sniffing for system management, development, and even end users, are helpful.

Tcpdump packet sniffing tools are widely used to derive real-time data packet, but you need to set up filtering rules to capture HTTP traffic, and even its original output is usually not convenient to stop at the HTTP protocol layer. Real-time web server log parser as ngxtop can provide real-time web traffic tracking readable marks, but it applies only to the case of full access to the live web server logs.

If there is a packet sniffer tool similar to tcpdump HTTP only for crawling traffic is very good. In fact, httpry is: HTTP packet sniffer tool. httpry capture HTTP packets, and the data content of the HTTP protocol layer in a readable form listed. By means of this article, let's learn how to use tools httpry sniff HTTP traffic.

Httpry installed on Linux

Debian-based systems (Ubuntu or LinuxMint), there is no basis for the warehouse httpry installation package (Translator's Note: I ubuntu14.04, warehouse already package can be installed directly). So we need to install the source code:

$ Sudo apt-get install gcc make git libpcap0.8-dev
$ Git clone https://github.com/jbittel/httpry.git
$ Cd httpry
$ Make
$ Sudo make install
In Fedora, CentOS or RHEL system, you can use the following command yum install httpry. On CentOS / RHEL system, so that it can access before running yum EPEL repo.

$ Sudo yum install httpry
If you still want to install httpry RPM-based system source code, you can achieve through these steps:

$ Sudo yum install gcc make git libpcap-devel
$ Git clone https://github.com/jbittel/httpry.git
$ Cd httpry
$ Make
$ Sudo make install
The basic usage httpry

The following are the basic usage httpry

$ Sudo httpry -i < network-interface>
httpry will listen on the specified network interface, and real-time display of the captured HTTP request / response.

In most cases, since the transmission and receipt of data packets cause excessive refresh quickly, difficult to analyze. At this time you definitely want to save the captured data packets down for off-line analysis. You can use the 'b' or '-o' option saves data packet. '-b' Option package saved as a binary file, so you can use the software to open the file to browse httpry. On the other hand, '- o' option to save the file in the form of character data in a readable down.

Save the file in binary form:

$ Sudo httpry -i eth0 -b output.dump
Browsing HTTP packets stored files:

$ Httpry -r output.dump
Note that no root privileges can use the '-r' option to read the data file.

The httpry character data files are saved:

$ Sudo httpry -i eth0 -o output.txt

httpry advanced applications

If you want to monitor a specified HTTP methods (such as: GET, POST, PUT, HEAD, CONNECT, etc.), use the '-m' option:

$ Sudo httpry -i eth0 -m get, head

Httpry If you download the source code, you will find some source Perl scripts, these scripts for analyzing httpry output. Script located in the directory httpry / scripts / plugins. If you want to write a custom parser httpry output, these pins can be used as a good example. Some of the following features:

hostnames: Display a list of unique host name.
find_proxies: detecting web proxy.
search_terms: Find statistics and search services inside the search term.
content_analysis: Find URL containing the specified key.
xml_output: convert the output to XML format.
log_summary: generate a log summary.
db_dump: save the database log file data.
Before using these scripts, first use the '-o' option to run httpry. When get to the output file immediately after the execution of the script using the following command:

$ Cd httpry / scripts
$ Perl parse_log.pl -d ./plugins < httpry-output-file>
You may encounter a warning when using plug-ins. For example, if you do not have a MySQL database with DBI interface is installed, it may fail when using db_dump plug. If a plug-in failed to initialize, then only this plugin can not be used, so you can ignore those warnings.

When parse_log.pl completed, you will see a number of analysis results in httpry / scripts directory. For example, log_summary.txt and follows similar.

In general, when you want to analyze HTTP packets when, httpry very useful. It may not be well known to most Linux users, but always with good. How do you think this kind of tool do?
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