ipftest(1)						      General Commands Manual							ipftest(1)

NAME

       ipftest - test packet filter rules with arbitrary input.

SYNOPSIS

       ipftest	[  -6bCdDoRvx  ] [ -F input-format ] [ -i <filename> ] [ -I interface ] [ -l <filename> ] [ -N <filename> ] [ -P <filename> ] [ -r
       <filename> ] [ -S <ip_address> ] [ -T <optionlist> ]

DESCRIPTION

       ipftest is provided for the purpose of being able to test a set of filter rules without having to put them in place, in operation and  pro-
       ceed to test their effectiveness.  The hope is that this minimises disruptions in providing a secure IP environment.

       ipftest will parse any standard ruleset for use with ipf, ipnat and/or ippool and apply input, returning output as to the result.  However,
       ipftest will return one of three values for packets passed through the filter: pass, block or nomatch.  This is intended to give the opera-
       tor a better idea of what is happening with packets passing through their filter ruleset.

       At least one of -N, -P or -r must be specified.

OPTIONS

       -6     Use IPv6.

       -b     Cause  the output to be a brief summary (one-word) of the result of passing the packet through the filter; either "pass", "block" or
	      "nomatch".  This is used in the regression testing.

       -C     Force the checksums to be (re)calculated for all packets being input into ipftest.  This may be necessary if pcap files from tcpdump
	      are being fed in where there are partial checksums present due to hardware offloading.

       -d     Turn  on	filter	rule  debugging.   Currently,  this  only  shows  you  what caused the rule to not match in the IP header checking
	      (addresses/netmasks, etc).

       -D     Dump internal tables before exiting.  This excludes log messages.

       -F     This option is used to select which input format the input file is in.  The following formats are available: etherfind,  hex,  pcap,
	      snoop, tcpdump,text.

	      etherfind
		     The  input  file  is to be text output from etherfind.  The text formats which are currently supported are those which result
		     from the following etherfind option combinations:

			etherfind -n
			etherfind -n -t

	      hex    The input file is to be hex digits, representing the binary makeup of the packet.	No length correction is made, if an incor-
		     rect length is put in the IP header.  A packet may be broken up over several lines of hex digits, a blank line indicating the
		     end of the packet.  It is possible to specify both the interface name and direction of the packet (for filtering purposes) at
		     the  start  of the line using this format: [direction,interface]  To define a packet going in on le0, we would use [in,le0] -
		     the []'s are required and part of the input syntax.

	      pcap The input file specified by -i is a binary file produced using libpcap (i.e., tcpdump version 3).  Packets are read	from  this
		     file as being input (for rule purposes).  An interface maybe specified using -I.

	      snoop  The  input file is to be in "snoop" format (see RFC 1761).  Packets are read from this file and used as input from any inter-
		     face.  This is perhaps the most useful input type, currently.

	      tcpdump
		     The input file is to be text output from tcpdump.	The text formats which are currently supported are those which result from
		     the following tcpdump option combinations:

			tcpdump -n
			tcpdump -nq
			tcpdump -nqt
			tcpdump -nqtt
			tcpdump -nqte

	      text   The  input  file is in ipftest text input format.	This is the default if no -F argument is specified.  The format used is as
		     follows:
			  "in"|"out" "on" if ["tcp"|"udp"|"icmp"]
			       srchost[,srcport] dsthost[,destport] [FSRPAU]

	      This allows for a packet going "in" or "out" of an interface (if) to be generated, being one of the three  main  protocols  (option-
	      ally),  and  if either TCP or UDP, a port parameter is also expected.  If TCP is selected, it is possible to (optionally) supply TCP
	      flags at the end.  Some examples are:
		   # a UDP packet coming in on le0
		   in on le0 udp 10.1.1.1,2210 10.2.1.5,23
		   # an IP packet coming in on le0 from localhost - hmm :)
		   in on le0 localhost 10.4.12.1
		   # a TCP packet going out of le0 with the SYN flag set.
		   out on le0 tcp 10.4.12.1,2245 10.1.1.1,23 S

       -i <filename>
	      Specify the filename from which to take input.  Default is stdin.

       -I <interface>
	      Set the interface name (used in rule matching) to be the name supplied.  This is useful where it is not otherwise possible to  asso-
	      ciate a packet with an interface.  Normal "text packets" can override this setting.

       -l <filename>
	      Dump log messages generated during testing to the specified file.

       -N <filename>
	      Specify the filename from which to read NAT rules in ipnat(5) format.

       -o     Save output packets that would have been written to each interface in a file /tmp/interface_name in raw format.

       -P <filename>
	      Read IP pool configuration information in ippool(5) format from the specified file.

       -r <filename>
	      Specify the filename from which to read filter rules in ipf(5) format.

       -R     Don't attempt to convert IP addresses to hostnames.

       -S <ip_address>
	      The  IP  address	specifived with this option is used by ipftest to determine whether a packet should be treated as "input" or "out-
	      put".  If the source address in an IP packet matches then it is considered to be inbound.  If it does not match then it  is  consid-
	      ered  to	be  outbound.	This  is  primarily for use with tcpdump (pcap) files where there is no in/out information saved with each
	      packet.

       -T <optionlist>
	      This option simulates the run-time changing of IPFilter kernel variables available with the -T option of ipf.  The optionlist param-
	      eter  is a comma separated list of tuning commands.  A tuning command is either "list" (retrieve a list of all variables in the ker-
	      nel, their maximum, minimum and current value), a single variable name (retrieve its current value) and a variable name with a  fol-
	      lowing assignment to set a new value.  See ipf(8) for examples.

       -v     Verbose mode.  This provides more information about which parts of rule matching the input packet passes and fails.

       -x     Print a hex dump of each packet before printing the decoded contents.

SEE ALSO

       ipf(5), ipf(8), snoop(1m), tcpdump(8), etherfind(8c)

BUGS

       Not all of the input formats are sufficiently capable of introducing a wide enough variety of packets for them to be all useful in testing.

																	ipftest(1)