Justniffer is a network TCP packet sniffer and logging tool. It captures network traffic, with a particular strength in analyzing and tracing HTTP communications. However, its flexible logging capabilities allow it to be adapted for various TCP-based protocols. Justniffer can decode HTTP data, providing detailed information about requests and responses, including client/server IP addresses, requested URLs, header fields, and message content. For other TCP traffic, it allows custom log formats to extract relevant information from the data stream.
Justniffer uses the libpcap network packet analysis library to capture network packets. It processes these packets to present data in a clear, readable format, enabling efficient traffic analysis and custom logging.
Justniffer can be used for:
- Verifying the correct functioning of applications by analyzing HTTP traffic.
- Debugging security issues related to network traffic.
- Analyzing performances and connection usage.
- Custom logging of various TCP-based protocols.
$ justniffer -i eth0
output:
192.168.2.2 - - [15/Apr/2009:17:19:57 +0200] "GET /sflogo.php?group_id=205860&type=2 HTTP/1.1" 200 0 "" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)"
192.168.2.2 - - [15/Apr/2009:17:20:18 +0200] "GET /search?q=subversion+tagging&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a HTTP/1.1" 200 0 "" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)"
192.168.2.2 - - [15/Apr/2009:17:20:07 +0200] "GET /sflogo.php?group_id=205860&type=2 HTTP/1.1" 200 0 "http://justniffer.sourceforge.net/" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid)Firefox/3.0.8)"
192.168.2.2 - - [15/Apr/2009:17:20:18 +0200] "GET /csi?v=3&s=web&action=&tran=undefined&ei=MvvlSdjOEciRsAbY0rGpCw&e=19592,20292&rt=prt.175,xjs.557,ol.558 HTTP/1.1" 204 0 "http://www.google.it/search?q=subversion+tagging&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8 Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)"
192.168.2.2 - - [15/Apr/2009:17:20:07 +0200] "GET /HTTP/1.1" 200 0 "" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)"
For example http response time (see man page for a complete keyword list)
$ justniffer -i eth0 -a " %response.time"
output:
192.168.2.5 - - [22/Apr/2009:22:27:36 +0200] "GET /sflogo.php?group_id=205860&type=2 HTTP/1.1" 200 0 "http://justniffer.sourceforge.net/" "Mozilla/5.0 (X11;U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)" 0.427993
192.168.2.5 - - [22/Apr/2009:22:27:50 +0200] "GET /complete/search?output=firefox&client=firefox&hl=en-US&q=add+e HTTP/1.1" 200 140 "" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)"0.294897
192.168.2.5 - - [22/Apr/2009:22:27:51 +0200] "GET /complete/search?output=firefox&client=firefox&hl=en-US&q=add+a HTTP/1.1" 200 128 "" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)"0.266929
192.168.2.5 - - [22/Apr/2009:22:27:21 +0200] "GET /extern_js/f/CgJlbiswCjgVLCswDjgFLCswFjgJLCswFzgBLCswGDgDLCswITgWLCswJTjJiAEsKzAmOAQsKzAnOAAs/-wB3HvFrpXA.js HTTP/1.1" 304 0 "http://www.google.com/search?q=gnusticker&hl=en&safe=off&start=20&sa=N" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8) Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8)" 2.025879
(add -u or -x options to encode unprintable characters):
$ justniffer -i eth0 -r
output:
GET /doc/maint-guide/ch-upload.en.html HTTP/1.1
Host: www.debian.org
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.8)
Gecko/2009032711 Ubuntu/8.10 (intrepid) Firefox/3.0.8
Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en,it;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: UTF-8,*
Keep-Alive: 300
Connection: keep-alive
Referer: http://www.debian.org/doc/maint-guide/
If-Modified-Since: Wed, 22 Apr 2009 19:36:31 GMT
If-None-Match: "400d604-3014-46829e160adc0"
Cache-Control: max-age=0
HTTP/1.1 304 Not Modified
Date: Wed, 22 Apr 2009 20:38:51 GMT
Server: Apache
Connection: Keep-Alive
Keep-Alive: timeout=15, max=100
ETag: "400d604-3014-46829e160adc0"
Expires: Thu, 23 Apr 2009 20:38:51 GMT
Cache-Control: max-age=86400
$ justniffer -i eth0 -l "%request.timestamp %source.ip %dest.ip %request.header.host %request.url"
output:
06/28/11 13:30:48 192.168.2.2 72.14.221.118 i1.ytimg.com /vi/TjSk6CVN5LY/default.jpg
06/28/11 13:30:47 192.168.2.2 72.14.221.118 i2.ytimg.com /vi/iw_nzfm1Vts/default.jpg
06/28/11 13:30:47 192.168.2.2 216.34.181.71 static.sourceforge.net /css/phoneix/jquery.cluetip.php?secure=0
06/28/11 13:30:48 192.168.2.2 216.34.181.71 static.sourceforge.net /sfx.js
06/28/11 13:30:49 192.168.2.2 216.34.181.71 static.sourceforge.net /include/coremetrics/v40/eluminate.js
06/28/11 13:30:51 192.168.2.2 199.93.61.126 c.fsdn.com /sf/images/phoneix/grad_white_dual_100.png
$ justniffer -f /file.cap
see project site
sudo apt install software-properties-common
sudo add-apt-repository ppa:oreste-notelli/ppa
sudo apt update
sudo apt install justniffer