Provided by: psad_2.2.3-1_amd64 
NAME
nf2csv - iptables to CSV data
SYNOPSIS
nf2csv [options]
DESCRIPTION
nf2csv Parses iptables log messages and generates comma-separate value formatted data. This is useful to
provide input to the AfterGlow project (see http://afterglow.sourceforge.net) so iptables logs can be
visualized graphically. An interesting application of nf2csv and AfterGlow is to parse and visualize the
iptables logfiles made available by the Honeynet project in their Scan of the Month challenges. The
Scan30 and Scan34 challenges (see http://www.honeynet.org/scans/scan30/ and
http://www.honeynet.org/scans/scan34/) contain extensive iptables logfiles, and some graphical
representations of these can be viewed here: http://www.cipherdyne.org/psad/honeynet/. The psad program
also has the ability to generate CSV data from iptables logs with its --CSV mode.
OPTIONS
-f, --fields <tokens>
Specify the set of fields that should be printed from iptables log messages. The most common usage
of this argument is SRC DST DPT to print the source and destination IP addresses, followed by the
destination port number. Available fields to print include: SRC, SPT, DST, DPT, PROTO, LEN, IN,
TOS, TTL, SEQ, ID, TYPE, CODE (and these can also be referred to as src, dst, sp, dp, proto,
ip_len, intf, tos, and ttl). There are several additional fields that are not given specific tags
within iptables log messages, and these can be included by specifying one of the following: flags,
top_opts, ip_opts, chain, log_prefix, frag_bit, src_mac, dst_mac, and udp_len. Each of these
fields accepts a search criteria in the form of a numeric comparison, string match, or IP match.
See the EXAMPLES section below for more information.
-u, --unique-lines
Only print unique output lines. This can drastically reduce the output of nf2csv depending on the
characteristics of the iptables logfile that is being parsed.
-m, --max-lines <num>
Specify the maximum number of output lines nf2csv will generate. This is useful for providing a
limited set of data to AfterGlow in order to make visualizations more clear and less cluttered.
-r, --regex <regex>
Specify a regular expression that must match against the entire iptables log message in order for
it to be included within the CSV output. This allows log messages to be included from the output
with all of the flexibility of regular expressions. See the EXAMPLES section below for more
information.
-n, --neg-regex <regex>
Specify a regular expression that must not match against the iptables log message in order for it
to be included within the CSV output. This allows log messages to be excluded from the output
with all of the flexibility of regular expressions. See the EXAMPLES section below for more
information.
-s, --start-line <line>
Specify the starting line where nf2csv begins to process iptables log data. If you are processing
a huge file with thousands of iptables log messages this option can be useful to parse a specific
chunk of this data. Also see the --end-line option below.
-e, --end-line <line>
Specify the last line of iptables log data that nf2csv will parse.
EXAMPLES
The following examples illustrate the command line arguments that could be supplied to nf2csv in a few
situations:
Print source and destination IP addresses and the destination port number:
$ nfcsv -f src dst dp
Same as above, but now require that the source IP come from the 11.11.11.0/24 subnet:
$ nfcsv -f src:11.11.11.0/24 dst dp
Display instances of the MyDoom worm:
$ nfcsv -f src dst dp:3127
Display packets that have low TTL values:
$ nfcsv -f src dst ttl:<10
Display all traffic to or from the host 11.11.11.67 (this sets up an OR condition between the src and dst
fields):
$ nfcsv -f src dst dp -r 11.11.11.67
Display likely instances of Window Messanger popup spam attempts (note the use of the --regex argument to
require minimal lengths on the UDP length field and source port, but the output contains the destination
port of 1026):
$ nfcsv -f src dst dp -r SPT={4}.*LEN=[4-9]{2}
SEE ALSO
psad(8)
AUTHOR
Michael Rash <mbr@cipherdyne.org>
BUGS
Send bug reports to mbr@cipherdyne.org. Suggestions and/or comments are always welcome as well.
DISTRIBUTION
nf2csv is distributed with the psad project (http://www.cipherdyne.org/psad/) under the GNU General Public License (GPL), and the latest version may be downloaded from http://www.cipherdyne.org/