Provided by: sniffit_0.3.7.beta-19ubuntu0.1_amd64 
NAME
sniffit - packet sniffer and monitoring tool
SYNOPSIS
sniffit [-xdabvnN] [-P proto ] [-A char ] [-p port ] [(-r|-R) recordfile ] [-l sniflen ] [-L logparam ]
[-F snifdevice ] [-D tty ] [-M plugin ] [(-t Target-IP | -s Source-IP ) | (-i|-I) | -c config-file ]
DESCRIPTION
sniffit is a packet sniffer for TCP/UDP/ICMP packets. sniffit is able to give you very detailed
technical info on these packets (SEQ, ACK, TTL, Window, ...) but also packet contents in different
formats (hex or plain text, ...).
sniffit can by default handle ethernet and PPP devices, but can easily be forced into using other devices
(read the README.FIRST and sn_config.h files on this subject!)
The sniffer can easily be configured in order to 'filter' the incoming packets (to make the sniffing
results easier to study). The config file (see sniffit(5) ) allows you to be verry specific on the
packets to be processed.
sniffit also has an interactive mode for active monitoring, and can also be used for continuous
monitoring on different levels.
NOTE
This man page is supposed to be a reference manual. So please read README.FIRST first, and use this only
for better understanding or for a quick check on the use of sniffit
OPTIONS
-v Shows the version of sniffit you are running and exits (overrides all)
-t Target-IP
Only process packets TO Target-IP. If Target-IP is in dot-nr notation, ´x' is allowed as wildcard.
(e.g. '-t 157.193.x', '-t x', ...) (NOT compatible with: '-s' '-i' '-I' '-c' '-v' '-L')
-s Source-IP
Similar to '-t', only process packets FROM Source-IP. (NOT compatible with: '-t' '-i' '-I' '-c'
'-v' '-L')
-b ´both' mode, together with '-s' or '-t', only process FROM/TO the IP specified by '-s' or '-t'
(NOT compatible with: '-t' '-i' '-I' '-c' '-v' '-L')
-c config-file
Use config-file for the packet filtering. This allows you to be very specific on the packets to be
processed (see sniffit(5) for details on the format). (NOT compatible with: '-t' '-s' '-i' '-I'
'-v' '-L')
-i Launch the ncurses interface for active monitoring ('interactive mode'). (NOT available if you
compiled without INTERACTIVE support see sn_config.h and README.FIRST ) (one of the options '-t'
'-s' '-i' '-I' '-c' is required) (NOT compatible with: '-t' '-s' '-c' '-v' '-L')
-I Same as '-i', but gives you more information. (one of the options '-t' '-s' '-i' '-I' '-c' is
required) (NOT compatible with: '-t' '-s' '-c' '-v' '-L')
-R <file>
Record all traffic in <file> This file can then be fed to Sniffit with the '-r' option. (Needs a
selection parameter like '-c' '-t' '-s') (NOT compatible with '-i' '-I' '-v' '-L' '-r')
-r <file>
This option feeds the recorded <file> to sniffit. It requires the '-F' option with the correct
device. Suppose you log a file on a machine with 'eth0'. When feeding the logged file to sniffit ,
you will need to add '-F eth0' or '-F eth' to the command line. It doesn't need much explanation
that using '-i' or '-I' in combination with '-r' makes no sense (at this moment). (requires '-F',
NOT compatible with '-R' '-i' '-I')
-n Turn of IP checksum checking. This can show you bogus packets. (mind you ARP, RARP, other non-IP
packets will show up bogus too) (compatible with ALL options)
-N Don't perform any of the build in Sniffit functions. Useful for only running a Plugin.
(compatible with ALL options)
-x Prints extended info on TCP packets to stdout (SEQ, ACK, Flags, etc...) Interesting when tracing
spoofs, packet loss and other real net debugging/checking tasks. (if you want to log this, pipe
stdout to a file) (NOT compatible with: '-i' 'I' '-v')
-d ´dump mode', shows the packets on the screen (stdout) instead of logging into files (default).
Data is printed in bytes (hex). (NOT compatible with: '-i' 'I' '-v' '-L')
-a ´dump mode', same of '-d' but outputs ASCII. Non printable chars are replaced by '.'. ('-d' and
'-a' mix without any problem) (NOT compatible with: '-i' '-I' '-v' '-L')
-P proto
Specify the protocols that should be processed (default TCP). Possible options currently are: IP,
TCP, ICMP, UDP. They can be combined. IP, ICMP, UDP info is dumped to stdout. IP gives ADDITIONAL
info on the IPwrapping around other packets, it is not needed to specify IP for TCP packet
logging. IP, ICMP packets are not filtered (UDP packets are as of 0.3.4). (NOT compatible with:
'-i' '-I' '-v' '-L')
-A char
When in 'normal mode' (not '-d','-a','-i','-I','-L'), all non-printable chars will be replaced by
char (NOT compatible with: '-a' '-d' '-i' '-I' '-v' '-L')
-p port
Only checks packets going TO (!!) port port , 0 means all ports, default is 0 (all). (NOT
compatible with: '-c' '-i' '-I' '-v' '-L')
-l sniflen
Amount of data to log (default 300 bytes) in 'normal mode'. The first sniflen bytes of every
connection are logged. Length 0 logs means everything. (look out with diskspace!) (NOT compatible
with: '-i' '-I' '-v' '-L')
-F snifdevice
Force sniffit to use a certain network device. snifdevice can be found with ifconfig (see
ifconfig(8)). sniffit supports ethernet and PPP by default. Read README.FIRST for info on forcing
the use of other devices. (compatible with ALL options)
-D tty All logging output will be send to that device. (ONLY works with '-i' and '-I')
-M plugin
Activate Plugin nr. Plugin , for a list on all plugins compiled in your version, just type '
sniffit ´. Read all about Plugins in the PLUGIN-HOWTO (READ IT!) (NOT compatible with: '-i' '-I'
'-v')
-L logparam
Use sniffit as a monitoring tool and enable different logging modes ( logparam ) The File for
logging can be specified in the config file (see sniffit(5) ) but is sniffit.log by default.
Different logparam can be combined. (ONLY works with '-c')
NORMAL MODE
A bunch of sniflen initial bytes (default 300) of each connection is logged into a file x.x.x.x.p-
y.y.y.y.o where 'x.x.x.x' is the sending host (port 'p') and 'y.y.y.y' the receiving host (port 'o').
DUMP MODE ('-d' and/or '-a')
Output is dumped to stdout, the packet contents is shown in it's unwrapped form (the complete IP packet).
INTERACTIVE MODE ('-i' or '-I')
Keys available in interactive mode:
'UP or 'k'
self explanatory
DOWN or j'
self explanatory
F1 or '1'
Enter a host (enter 'all' for no mask) for packet filtering (host that sends the packets)
F2 or '2'
Enter a host (enter 'all' for no mask) for packet filtering. (host that receives the packets)
F3 or '3'
Enter a port (enter '0' for no mask) for packet filtering. (host that sends the packets)
F4 or '4'
Enter a port (enter '0' for no mask) for packet filtering. (host that receives the packets)
F5 or '5'
Start a program 'sniffit_key5' with arguments <from IP> <from port> <to IP> <to port> If the
program doesn't exist, nothing is done. Sniffit should be in the same path as sniffit was STARTED
FROM (not necessarely the path sniffit is stored in) This function is useful for interactive
connection killing or extra monitoring. A little shell script can always transform the arguments
given and pass them on to other programs.
F6 or '6'
Same as F5 or '5', but with program 'sniffit_key6'
F7 or '7'
Same as F5 or '5', but with program 'sniffit_key7'
F8 or '8'
Same as F5 or '5', but with program 'sniffit_key8'
ENTER a window will pop up and log the connection, or the connection output will be send at a chosen
device if you used the '-D' option.
'q' When in logging mode, stop logging. Otherwise, quit.
'n' Toggle netstatistics. These are sampled at 3 secs, look in the sn_config.h file to change this.
'g' Sniffit is now able to generate some trafic load. Currently this is a 'underdevelloped' feature
with very few options, but it will be expanded a lot. Currently only UDP packets are generated.
When pressing 'g' you will be asked the source/dest IP/port and how much packets are needed to be
transmitted. Packets contain the line: "This Packet was fired with Sniffit!
'r' Reset.. clears all current connections from memory and restarts.
LOGGING MODE ('-L')
Output is saved to sniffit.log , unless you have specified some other name in the config file (see
sniffit(5) ).
raw Log all SYN, FIN, RST packets. This will give you an overview of all network (TCP) trafic in a
'RAW' way (a connection starting could gives you at least 2 SYN packets, etc...).
norm Same as raw, but a bit more intelligent. Unless packets are transmitted multiple times because of
packet loss, you will only get 1 notice of a connection starting or ending. (the packet id will
give you the host that initiated the connection first)
telnet Sniffit will try to catch login and passwords for this application. (see telnet(1) )
ftp Sniffit will try to catch login and passwords for this application. (see ftp(1) )
mail Sniffit will try to identify all mail that was logged.
IP ICMP UDP LOGGING
Information on these packets is dumped to stdout. Packet Filtering options only refer to TCP and UDP
packets. The contents of UDP packets is only shown when enabling '-a' or '-d'.
AUTHOR
Brecht Claerhout <coder@reptile.rug.ac.be>
SEE ALSO
sniffit(5)
SNIFFIT(8)