Manual Page - tcpick(8)
Manual Reference Pages - tcpick (8)
NAME
tcpick - tcp stream sniffer and connection tracker
CONTENTS
Synopsis
Description
Base Options
Display The Data In The Tcp Packets
Rebuild And Write The Tcp Stream To File
Display The Rebuilded Tcp Stream
Examples
Mailing-list
Tcpick Website
Authors
Bugs
See Also
License
SYNOPSIS
tcpick [ -a ] [ -n ] [ -C ]
[ -e count ]
[ -i interface | -r file ]
[ -X timeout ]
[ -D ] [ -F1 | -F2 ]
[ -yH | -yP | -yR | -yU | -yx | -yX ]
[ -bH | -bP | -bR | -bU | -bx | -bX ]
[ -wH[ub] | -wP[ub] | -wR[ub] | -wU[ub] ]
[ -v [ verbosity ]] [ -S ] [ -h ]
[ --separator ]
[ -T | -Tf [ number ]]
[ -E | -Ef [ number ]]
[ -Pc | -Ps ]
[ "filter" ]
[ --help ] [ --version ]
DESCRIPTION
tcpick
is a textmode sniffer libpcap-based that can track
tcp streams and saves the
data captured in different files, each for every connection,
or displays them in the terminal in different
formats (hexdump, printable charachters, raw...)
Useful for picking files in a passive way.
It is useful to keep track of what users of a network are doing, and is
usable with textmode tools like grep, sed, awk.
Happy data hunting :-)
BASE OPTIONS
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-i --interface interface |
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listen on selected interface, (i.e. ppp0 or eth0). If option -i is omitted, tcpick is
able to select the first open interface (usually a ethernet card).
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-r --readfile |
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reads raw packets from a file written with
tcpdump -w instead of using a network device.
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"filter"
|
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This is the filter for the capturer engine. You can set it in
the same way of setting the
tcpdump(1) filter. Read tcpdump(1) manpage for other explanations.
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-a |
Displays host names instead of ip addresses. Warning: for every new ip
grabbed a dns query will be generated! Use it carefully on
high-traffic network devices!
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-C --colors |
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Uses terminal colors: very nice!
It should help you to read the output of tcpick
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-D number --dirs number |
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Create directories to store sniffed sessions.
When a directory contains number sessions, a new one will be
created.
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-e count |
Exits when count packets have been sniffed
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-E number |
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Exit when number sniffed connections are detected as "CLOSED"
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-Ef number |
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Exit when the first number connections are detected as "CLOSED"
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-F1 -F2 --filenaming 1|2 |
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Choose the filenaming system.
-F1 : tcpick_clientip_serverip.side.dat
(side means clnt, serv or both)
-F2 : tcpick_connectionnumber_clientip_serverip.side.dat
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-h |
Shows source and destination ip and port; shows tcp flags as letters.
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--help |
Displays a short help summary
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-p |
Don’t put the network interface in promiscuous mode. Note that
the interface might be in promiscuous mode for some other reason.
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-S |
Suppresses the "status of the connection" banner.
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--separator |
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Add a separator for the payloads displayed.
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-t |
Adds timestamp in hour:minutes:seconds:microseconds format
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-td |
Like -tP with date timestamp in day-month-year format
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-T number |
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Track number connections. It could be very useful on a
high-traffic network device.
If number is not specified, it will be set to 1.
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-Tf number |
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Track only the first number connections; the following will be
discarded. If number is not specified, it will be set to 1.
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-v verbosity |
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Quite unuseful, yet. Set verbosity level. Actually there are not
really many
extra messages to display, this means it is enabled by default
(-v1).
Set verbosity level to 0 to suppress extra messages
(-v0) except error messages.
Set verbosity level to 5 to display debug messages
(-v5).
There are not other verbosity levels.
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-X timeout |
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Connections are considered EXPIRED when there is no traffic for at
least timeout seconds. Default is 600.
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--version |
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Displays the tcpick version
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DISPLAY THE DATA IN THE TCP PACKETS
These options are prefixed by -y and are useful to display in
various ways the content of the packet sniffed (the data, called
payload), once it arrives at the listening interface. In that way the
tcp duplicates will be not discarded and the packets will not be
reordered, but displayed "as is". If you want a fully acknowledged
stream, see the -w and -b set of options.
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|
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-yH |
View data in hexadecimal-spaced mode (for the hexdump see -yx and
-yX options.
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-yP |
Shows data contained in the tcp packets. Non-printable charachters are
transformed in dots: ".". Newline character is preserved.
This is the best way, in my opinion to show data like HTTP requests,
IRC communication, SMTP stuff and so on.
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-yR |
Displays all kind of charachters, printable and non printable. If
something binary is transmitted, the effect will probably be like
watching with "cat" at a gzipped file.
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-yx |
Shows all data after the header in hexadecimal dump of 16 bytes per line.
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-yX |
Shows all data after the header in hexadecimal and ascii dump with 16
bytes per line.
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-yU |
Shows all data after the header, but Unprintable charachters are
displayed as hexadecimal values between a "<" and a ">" symbol.
|
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REBUILD AND WRITE THE TCP STREAM TO FILE
The prefix for these options is -w.
The TCP stream that has been sniffed with these options will be
written to file named:
client_<ip_client>_<ip_server>_<port_server>.tcpick and
server_<ip_client>_<ip_server>_<port_server>.tcpick
With the u flag of the -w option (i.e. -wRu)
both client and server data
will be written to a unique file named in that way:
<ip_client>_<ip_server>_<port_server>.tcpick
If you use the additional flag b of the -w option
(i.e. -wPub), in the file will be written this banner:
[client|server] offset before:offset after (lenght of rebuilded
segment)
to distinguish between client and server data.
The flow is rebuilded, reordered and the duplicates are dropped. In
that way it is possible to sniff entire files transmitted via ftp
without data corruption (you can see this with md5sum).
If no argument is given to -w the data will be written like
-wR You can decide to write only client or server data by setting the flag
C (output only client data) and S (output only server
data) to the -w set.
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-wR |
This is the preferred option: data will be written without any
changes. Useful for sniffing binary or compressed files.
(-wRC only the client, -wRS only the server)
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-wP |
Unprintable charachters are written like dots.
(-wPC only the client, -wPS only the server)
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-wU |
Unprintable charachters are
displayed as hexadecimal values between a "<" and a ">" symbol.
(-wPC only the client, -wPS only the server)
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-wH |
The flow is written in hexadecimal-spaced mode.
(-wHC only the client, -wHS only the server)
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DISPLAY THE REBUILDED TCP STREAM
The prefix for these options is -b.
This set of options is very useful if you want to redirect the sniffed
flow to anoter program with a pipe, and there should be no data
corruption.
Of course the most useful is -bR to show the data as they are
(raw).
A very useful feature is the flag C (output only client data)
and S (output only server data). I.e.: -bRC will display
only the data from the client in raw mode; in that way you can put
them in a file with a pipe redirection.
The sub-options are quite the same of the -y set, so you have:
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-bH hex-spaced
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(-bHC only the client, -bHS only the server)
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-bP unprintable displayed as dots
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(-bPC only the client, -bPS only the server)
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-bR raw mode
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(-bRC only the client, -bRS only the server)
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-bU unprintable as <hex>.
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(-bUC only the client, -bUS only the server)
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-bx hexdump
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(-bxC only the client, -bxS only the server)
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-bU hexdump + ascii
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(-bXC only the client, -bXS only the server)
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-PC --pipe client
|
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This is an alias for -bRC -S -v0 -Tf1 -Ef1.
With this option you are able to track only the first connection (-T1)
matched by tcpick and data are displayed as raw. Only data from the
client are
put on stdout. All messages and banners are suppressed, except error
messages (-S -v0),
so this option is particulary useful to download an entire
fully rebuilded and acknowledged connection.
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-PS --pipe server
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This is an alias for -bRS -S -v0 -Tf1 -Ef1.
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EXAMPLES
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how to display the connection status:
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# tcpick -i eth0 -C
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display the payload and packet headers:
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# tcpick -i eth0 -C -yP -h -a
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display client data only of the first smtp connection:
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# tcpick -i eth0 -C -bCU -T1 "port 25"
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download a file passively:
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# tcpick -i eth0 -wR "port ftp-data"
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log http data in unique files (client and server mixed together):
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# tcpick -i eth0 "port 80" -wRub
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redirect the first connection to a software:
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# tcpick -i eth0 --pipe client "port 80" | gzip > http_response.gz
# tcpick -i eth0 --pipe server "port 25" | nc foobar.net 25
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MAILING-LIST
Address:
<tcpick-project[a]lists.sourceforge.net>
Archive:
http://sourceforge.net/mailarchive/forum.php?forum=tcpick-project
Subscribe:
http://lists.sourceforge.net/lists/listinfo/tcpick-project
If you have new ideas, patches, feature requests or simply need help,
don’t wait! I will be grateful if you send a message to the mailing
list (even if you want to say what you liked most on tcpick).
TCPICK WEBSITE
The tcpick website is at http://tcpick.sf.net.
You can find the project page here:
http://sourceforge.net/projects/tcpick kindly hosted by the
sourceforge team.
AUTHORS
Please check AUTHORS file.
BUGS
Tcpick is an experimental software, and maybe
some bugs are described in the KNOWN-BUGS
file.
On some versions of MacOSX Segmentation Fault happens and connections
aren’t tracked properly.
If you find any other bug, please write to the tcpick mailing list.
SEE ALSO
Other nice packet/data sniffers:
tcpdump, ngrep, tcptrack, ettercap, ethereal, snort
LICENSE
This program is
free software; you can redistribute it and/or modify it under the terms of the
GNU General Public License
as published by the Free Software Foundation; either version 2 of the
License, or (at you option) any later version.
This program is distributed in the hope
that it will be useful, but WITHOUT ANY WARRANTY;
without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111,
USA.
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