chaosreader(1)

NAME
chaosreader - trace network sessions and export it to html format

SYNOPSIS
chaosreader
chaosreader [-adehiknqrvxAHIRTUXY] [-D dir]
            [-b port[,...]] [-B port[,...]]
            [-j IPaddr[,...]] [-J IPaddr[,...]]
            [-l port[,...]] [-L port[,...]] [-m bytes[k]]
            [-M bytes[k]] [-o "time"|"size"|"type"|"ip"]
            [-p port[,...]] [-P port[,...]]
            infile [infile2 ...]
chaosreader -s [mins] | -S [mins[,count]]
            [-z] [-f 'filter']

DESCRIPTION
Chaosreader traces TCP/UDP/others sessions and fetches application data from snoop or tcpdump logs. This is a type of "any-snarf" program, as it will fetch telnet sessions, FTP files, HTTP transfers (HTML, GIF, JPEG etc) and SMTP emails from the captured data inside network traffic logs. A html index file is created to that links to all the session details, including realtime replay programs for telnet, rlogin, IRC, X11 and VNC sessions. Chaosreader reports such as image reports and HTTP GET/POST content reports.

It also creates replay programs for telnet sessions, so that you can play them back in realtime (or even different speeds).

Chaosreader can also run in standalone mode, where it invokes tcpdump or snoop (a similar to tcpdump program for Solaris) to create the log files and then processes them.

OPTIONS

-a, --application
    Create application session files (default).

-d, --preferdns
    Show DNS names instead of IP addresses.

-e, --everything
    Create HTML 2-way & hex files for everything.

-h  Print a brief help.

--help
    Print verbose help (this) and version.

--help2
    Print massive help.

-i, --info
    Create info file.

-q, --quiet
    Quiet, no output to screen.

-r, --raw
    Create raw files.

-v, --verbose
    Verbose.

-x, --index
    Create index files (default).

-A, --noapplication
    Exclude application session files.

-H, --hex
    Include hex dumps (slow).

-I, --noinfo
    Exclude info files.

-R, --noraw
    Exclude raw files.

-T, --notcp
    Exclude TCP traffic.

-U, --noudp
    Exclude UDP traffic.

-Y, --noicmp
    Exclude ICMP traffic.

-X, --noindex
    Exclude index files.

-k, --keydata
    Create extra files for keystroke analysis.

-n, --names
    Include hostnames in hyperlinked HTTPlog (HTML)

-D dir, --dir dir
    Output all files to this directory.

-b 25,79, --playtcp 25,79
    Replay these TCP ports as well (playback).

-B 36,42, --playudp 36,42
    Replay these UDP ports as well (playback).

-l 7,79, --htmltcp 7,79
    Create HTML for these TCP ports as well.

-L 7,123, --htmludp 7,123
    Create HTML for these UDP ports as well.

-m 1k, --min 1k
    Min size of connection to save ("k" for Kb).

-M 1024k, --max 1k
    Max size of connection to save ("k" for Kb)

-o size, --sort size
    Sort Order: time/size/type/ip (Default time).

-p 21,23, --port 21,23
    Only examine these ports (TCP & UDP).

-P 80,81, --noport 80,81
    Exclude these ports (TCP & UDP).

-s 5, --runonce 5
    Standalone. Run tcpdump/snoop for 5 mins.

-S 5,10, --runmany 5,10
    Standalone, many. 10 samples of 5 mins each.

-S 5, --runmany 5
    Standalone, endless. 5 min samples forever.

-z, --runredo
    Standalone, redo. Rereads last run's logs.

-j 10.1.2.1, --ipaddr 10.1.2.1
    Only examine these IPs.

-J 10.1.2.1, --noipaddr 10.1.2.1
    Exclude these IPs.

-f 'port 7', --filter 'port 7'
    With standalone, use this dump filter.

OUTPUT FILES
Many files will be created, run this in a clean directory. Short example:

index.html
    Html index (full details).

index.text
    Text index.

index.file
    File index for standalone redo mode.

image.html
    HTML report of images.

getpost.html
    HTML report of HTTP GET/POST requests.

session_0001.info
    Info file describing TCP session #1.

session_0001.telnet.html
    HTML colored 2-way capture (time sorted).

session_0001.telnet.raw
    Raw data 2-way capture (time sorted).

session_0001.telnet.raw1
    Raw 1-way capture (assembled) server->client.

session_0001.telnet.raw2
    Raw 1-way capture (assembled) client->server.

session_0002.web.html
    HTML colored 2-way.

session_0002.part_01.html
    HTTP portion of the above, a HTML file.

session_0003.web.html
    HTML colored 2-way.

session_0003.part_01.jpeg
    HTTP portion of the above, a JPEG file.

session_0004.web.html
    HTML colored 2-way.

session_0004.part_01.gif
    HTTP portion of the above, a GIF file.

session_0005.part_01.ftp-data.gz
    An FTP transfer, a gz file.

CONVENTIONS

session_*
    TCP Sessions.

stream_*
    UDP Streams.

icmp_*
    ICMP packets.

index.html
    HTML Index.

index.text
    Text Index.

index.file
    File Index for standalone redo mode only.

image.html
    HTML report of images.

getpost.html
    HTML report of HTTP GET/POST requests.

*.info
    Info file describing the Session/Stream.

*.raw
    Raw data 2-way capture (time sorted).

*.raw1
    Raw 1-way capture (assembled) server->client.

*.raw2
    Raw 1-way capture (assembled) client->server.

*.replay
    Session replay program (perl).

*.partial.*
    Partial capture (tcpdump/snoop were aware of drops).

*.hex.html
    2-way Hex dump, rendered in colored HTML.

*.hex.text
    2-way Hex dump in plain text.

*.X11.replay
    X11 replay script (talks X11).

*.textX11.replay
    X11 communicated text replay script (text only).

*.textX11.html
    2-way text report, rendered in red/blue HTML.

*.keydata
    Keystroke delay data file. Used for SSH analysis.

MODES

Normal
    eg "chaosreader infile", this is where a tcpdump/snoop file was created previously and chaosreader reads and processes it.

Standalone once
    eg "chaosreader -s 10" this is where chaosreader runs tcpdump/snoop and generates the log file, in this case for 10 minutes, and then processes the result. Some OS's may not have tcpdump or snoop available so this will not work (instead you may be able to get Ethereal, run it, save to a file, then use normal mode). There is a master index.html and the report index.html in a sub dir, which is of the format out_YYYYMMDD-hhmm, eg "out_20031003-2221".

Standalone, many
    eg "chaosreader -S 5,12", this is where chaosreader runs tcpdump/snoop and generates many log files, in this case it samples 12 times for 5 minutes each. While this is running, the master index.html can be viewed to watch progress, which links to minor index.html reports in each sub directory.

Standalone, redo
    eg "chaosreader -ve -z", (the -z), this is where a standalone capture was previously performed - and now you would like to reprocess the logs - perhaps with different options (in this case, "-ve"). It reads index.file to determine which capture logs to read.

Standalone, endless
    eg "chaosreader -S 5", like standalone many - but runs forever (if you ever had the need?). Watch your disk space!

Note: this is a work in progress, some of the code is a little unpolished.

NOTES

•   Run chaosreader in an empty directory.

•   Create small packet dumps. Chaosreader uses around 5x the dump size in memory. A 100Mb file could need 500Mb of RAM to process.

•   Your tcpdump may allow "-s0" (entire packet) instead of "-s9000".

•   Beware of using too much disk space, especially standalone mode.

•   If you capture too many small connections giving a huge index.html, try using the -m option to ignore small connections. eg "-m 1k".

•   snoop logs may actually work better. Snoop logs are based on RFC1761, however there are many variants of tcpdump/libpcap and this program cannot read them all. If you have Ethereal you can create snoop logs during the "save as" option. On Solaris use "snoop -o logfile".

•   tcpdump logs may not be portable between OSs that use different sized timestamps or endian.

•   Logs are best created in a memory filesystem for speed, usually /tmp.

•   For X11 or VNC playbacks, first practise by replaying a recent captured session of your own. The biggest problem is color depth, your screen must match the capture. For X11 check authentication (xhost +), for VNC check the viewers options (-8bit, "Hextile", ...)

•   SSH analysis can be performed with the "sshkeydata" program as demonstrated on http://www.brendangregg.com/sshanalysis.html . chaosreader provides the input files (*.keydata) that sshkeydata analyses.

BUGS
The following assumptions may cause problems (check for new vers):

•   A lower port number = the service type. Eg with ports 31247 and 23, the actual type of session is telnet (23). This may not work for some things (eg, VNC).

•   Time based order is more important for 2-way sessions (eg telnet), SEQ order is more import for 1-way transfers (eg ftp-data).

•   One particular TCP session isn't active for long enough that the SEQ number loops (or even wraps).

EXAMPLES

•   Example 1:

    tcpdump -s9000 -w output1        # create tcpdump capture file
    chaosreader output1              # extract recognised sessions, or,
    chaosreader -ve output1          # gimme everything, or,
    chaosreader -p 20,21,23 output1  # only ftp and telnet...

•   Example 2:

    snoop -o output1                 # create snoop capture file instead
    chaosreader output1              # extract recognised sessions...

•   Example 3:

    chaosreader -S 2,5      # Standalone, sniff network 5 times for 2 mins
                            each. View index.html for progress (or .text)

SEE ALSO
tcpdump(8), snoop(1M), chaosreader help page.

AUTHORS
chaosreader was written by Brendan Gregg.

This manual page was written by Joao Eriberto Mota Filho <eriberto@debian.org> for the Debian project (but may be used by others).