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iplog

NAME

iplog - TCP/IP traffic logger.

SYNOPSIS

iplog [options]

[-DFILNPRSTUVbcdefhkmnopqstvwxyz]
[-a <network,network2,...>]
[-g <group>]
[-i <interface1,...,interfaceN>]
[-l <logfile>]
[--pid-file=<file>]
[-u <user>]
[--tcp[=argument]]
[--udp[=argument]]
[--icmp[=argument]]
[--facility=syslog facility]
[--priority=syslog priority]

DESCRIPTION

iplog is a TCP/IP traffic logger. Currently, it is capable of logging TCP, UDP and ICMP traffic. Adding support for other protocols should be relatively easy. iplog's capabilities include the ability to detect TCP port scans, TCP null scans, FIN scans, UDP and ICMP "smurf" attacks, bogus TCP flags (used by scanners to detect the operating system in use), TCP SYN scans, TCP "Xmas" scans, ICMP ping floods, UDP scans, and IP fragment attacks. iplog is able to run in promiscuous mode and monitor traffic to all hosts on a network. iplog uses libpcap to read data from the network and can be ported to any system that supports pthreads and on which libpcap will function.

NOTATION

Throughout this document, required parameters will be denoted by enclosing the parameter in angle brackets <like this>.

Optional parameters will be denoted by enclosing the parameter in square brackets [like this].

The '|' character is used to express exclusive or. For example [true|false] means you may give "true" or "false", but not both.

OPTIONS

--tcp=true (default) Log TCP traffic.

--tcp=false

Do not log TCP traffic.

--udp=true (default)

Log UDP traffic.

--udp=false

Do not log UDP traffic.

--icmp=true (default)

Log ICMP traffic.

--icmp=false

Do not log ICMP traffic.

--facility=syslog facility

Use the specified facility for openlog(3).

--priority=syslog priority

Use the specified priority for syslog(3).

-D, --log-dest=true

Log the destination address of IP packets.

--log-dest=false (default)

Do not log the destination address of IP packets.

-F, --detect-udp-scan=true (default)

Detect and log UDP scans.

--detect-udp-scan=false

Neither detect nor log UDP scans.

--log-udp-scan

Same as --detect-udp-scan.

-I, --icmp-resolve=true (default)

Perform host name resolution for ICMP traffic.

-L, --stdout

Log to stdout.

--icmp-resolve=false

Do not perform host name resolution for ICMP traffic.

-N, --disable-resolver

Do not perform host name resolution for any traffic.

-P, --detect-ping-flood=true (default)

Detect ping (ICMP echo) flood attacks.

--detect-ping-flood=false

Do not detect ping flood attacks.

--log-ping-flood

Same as --detect-ping-flood.

-R, --restart

Restart iplog, if it is running.

-S, --detect-smurf=true (default)

Detect "smurf" attacks.

--detect-smurf=false

Do not detect "smurf" attacks.

--log-smurf

Same as --detect-smurf.

-T, --tcp-resolve=true (default)

Perform host name resolution for TCP traffic.

--tcp-resolve=false

Do not perform host name resolution for TCP traffic.

-U, --udp-resolve=true (default)

Perform host name resolution for UDP traffic.

--udp-resolve=false

Do not perform host name resolution for UDP traffic.

-V, --verbose=true

Verbose - Log packets with a bad checksum and packets with a short header length.

--verbose=false (default)

Do not be verbose.

-a <network,network2,...>, --promisc=<network,network2,...>

Put all monitored interfaces into promiscuous mode and log traffic destined to all hosts on the specified network(s).

-b, --detect-bogus=true (default)

Detect bogus TCP flags. Programs such as nmap and queso may set these flags while trying to perform OS detection.

--detect-bogus=false

Do not detect bogus TCP flags.

--log-bogus

Same as --detect-bogus.

-c, --dns-cache=true (default)

Use a built-in DNS cache (allows host lookups to be faster).

--dns-cache=false

Do not use the built-in DNS cache.

-d, --ignore

Ignore DNS traffic from hosts listed in /etc/resolv.conf.

-e, --get-ident=true

Perform ident (RFC 1413) lookups on connections destined to a listening port. This is only available on Linux.

--get-ident=false (default)

Do not perform ident lookups.

-f, --detect-fin-scan=true (default)

Detect TCP FIN scans (a "stealth scan" used by nmap and other scanners).

--detect-fin-scan=false

Do not detect TCP FIN scans.

--log-fin-scan

Same as --detect-fin-scan.

-q, --detect-syn-scan=true (default)

Detect TCP SYN scans (a "stealth scan" used by nmap and other scanners).

--detect-syn-scan=false

Do not detect TCP SYN scans.

--log-syn-scan

Same as --detect-syn-scan.

-g <group|GID>, --group=<group|GID>

Run with the specified group or GID.

-h, --help

Print a summary of available options and exit.

-i <interface(s)>, --interface=<interface(s)>

Listen on only the specified interfaces. This option takes a comma-delimited list of interfaces. By default, iplog will listen on any interfaces that are up, except loopback.

-k, --kill

Kill iplog, if it is running.

-l <logfile>, --logfile=<logfile>

Log to the specified file instead of logging via syslog(3)

--pid-file=<file>

Use <file> as the pid file.

This option should be used when starting iplog as a user who doesn't have write access to /var/run.

This option must be used with the -k and -R options when an instance of iplog is running that was started with the --pid-file option. Also note the --pid-file option must be given before the -k and -R options.

-m, --scans-only=true

Only log scans and floods. Do not log other traffic.

-n, --detect-null-scan=true (default)

Detect null scans (a "stealth scan" used by nmap and other scanners).

--detect-null-scan=false

Do not detect null scans.

--log-null-scan

Same as --detect-null-scan.

-o, --no-fork

Run in the foreground.

-p, --detect-portscan=true (default)

Detect port scans (connect(2) scans and SYN (half open) scans).

--detect-portscan=false

Do not detect port scans.

--log-portscan

Same as --detect-portscan.

-s, --detect-syn-flood=true (default)

Stop resolving IP addresses (until the flood ends) if a SYN flood is detected.

--detect-syn-flood=false

Do not stop resolving IP addresses if a SYN flood is detected.

-t, --detect-traceroute=true (default)

Detect (and log) traceroute.

--detect-traceroute=false

Do not detect traceroute.

--log-traceroute

Same as --detect-traceroute.

-u <user|UID>, --user=<user|UID>

Run as the user or with the UID specified.

-v, --version

Print version information and exit.

-w, --log-ip

Log the IP addresses as well as the hostnames of hosts that are looked up.

-x, --detect-xmas-scan=true (default)

Detect Xmas scans (a "stealth" scan used by nmap and other scanners).

--detect-xmas-scan=false

Do not detect Xmas scans.

--log-xmas-scan

Same as --detect-xmas-scan.

-y, --detect-frag=true

Detect fragment attacks.

--detect-frag=false

Do not detect fragment attacks.

--log-frag

Same as --detect-frag.

-z, --fool-nmap=true

Attempt to fool programs, such as nmap and queso, that perform remote OS detection. As a side effect, this option will also cause most of nmap's "stealth" scans to fail.

WARNING

This option is dangerous and can set off network traffic storms.

--fool-nmap=false (default)

Do not attempt to fool nmap's OS detection.

FILES

/etc/iplog.conf

The iplog configuration file.

BUGS

Report any bugs to odin@numb.org

AUTHOR

Ryan McCabe <odin@numb.org>

AVAILABILITY

The primary distribution site for iplog is http://ojnk.sourceforge.net

MIRROR LIST

ftp://ojnk.sourceforge.net/pub/ojnk/iplog
http://www.numb.org/~odin

SEE ALSO

iplog.conf(5) tcpdump(1) syslog(3) openlog(3) pcap(3) nmap(8)