Linux command-line grab packet and Packet parsing tool Tshark (Wireshark) Use instance parsing

Under Linux, when we need to crawl network packet analysis, we usually use the Tcpdump crawl Network raw packet to a file, and then download it locally using the Wireshark Interface Network analysis tool for network packet analysis.
Only recently found that the original Wireshark also provided with the Linux command line tool-tshark. Tshark not only has the function of grasping the package, but also has the ability to parse various protocols. Here we introduce the Tshark tool in two instances.
1. Installation method

Centos:yum install-y Wireshark
Ubuntu:apt-get install-y Tshark

2. Print the URL of the current HTTP request (including the domain name) in real time

Tshark-s 512-i eth0-n-F ' TCP DST Port + '-R ' http.host and Http.request.uri '-t fields-e http.host-e http.request.u Ri-l | Tr-d ' \ t '

The following describes the meaning of the parameters:

-S 512: FETCH only the first 512 bytes of data
-I eth0: Capture eth0 Nic
-N: Prohibit network object name resolution
-F ' TCP DST port 80 ': only catch packets with protocol TCP, destination port 80
-R ' Http.host and Http.request.uri ': Filter out Http.host and Http.request.uri
-T fields-e http.host-e Http.request.uri: printing http.host and Http.request.uri
-L: Output to standard output

3. Print the current MySQL query statement in real time

Tshark-s 512-i eth0-n-F ' TCP DST Port 3306 '-R ' mysql.query '-t fields-e mysql.query

The following describes the meaning of the parameters:

-S 512: FETCH only the first 512 bytes of data
-I eth0: Capture eth0 Nic
-N: Prohibit network object name resolution
-F ' TCP DST Port 3306 ': only catch packets with protocol TCP, destination port 3306
-R ' Mysql.query ': Filter out Mysql.query
-T fields-e mysql.query: print MySQL query statement

Tshark uses-f to specify a catch packet filter rule, as with tcpdump, which can be checked by command man Pcap-filter.
The Tshark uses-R to filter the captured package, which is consistent with the upper-left corner of the interface board Wireshark.

From: https://www.centos.bz/2014/07/linux-commandline-capture-packets-tshark-wireshark/