1.\" Copyright (c) 2006 Niclas Zeising <zeising@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd May 22, 2006 28.Dt IPFWPCAP 8 29.Os 30.Sh NAME 31.Nm ipfwpcap 32.Nd "copy diverted packets to a file in tcpdump format" 33.Sh SYNOPSIS 34.Nm 35.Op Fl dr 36.Op Fl b Ar maxbytes 37.Op Fl p Ar maxpkts 38.Op Fl P Ar pidfile 39.Ar portnum 40.Ar dumpfile 41.Sh DESCRIPTION 42The 43.Nm 44utility is used to copy diverted packets to a file in 45.Xr tcpdump 1 46format. 47The interesting packets are diverted by 48.Xr ipfw 8 49to a port on which 50.Nm 51listens. 52The packets are then dropped unless 53.Fl r 54is used. 55.Pp 56The options are as follows: 57.Bl -tag -width indent 58.It Fl d 59Turns on extra debugging messages. 60.It Fl r 61Writes packets back to the 62.Xr divert 4 63socket. 64.It Fl rr 65Indicates that it is okay to quit if 66.Ar maxbytes 67or 68.Ar maxpkts 69are reached. 70Diverted packets will silently disappear if nothing is listening on the 71.Xr divert 4 72socket. 73.It Fl b Ar maxbytes 74Stop dumping after 75.Ar maxbytes 76bytes. 77.It Fl p Ar maxpkts 78Stop dumping after 79.Ar maxpkt 80packets. 81.It Fl P Ar pidfile 82File to store PID number in. 83Default is 84.Pa /var/run/ipwfpcap.portnr.pid . 85.El 86.Pp 87The 88.Ar portnum 89argument specifies which 90.Xr divert 4 91socket port to listen on. 92The 93.Ar dumpfile 94argument is the path to the file to write captured packets to. 95Specify 96.Sq Fl 97to write to stdout. 98.Sh EXIT STATUS 99.Ex -std 100.Sh EXAMPLES 101.Dl "ipfwpcap -r 8091 divt.log &" 102.Pp 103Starts 104.Nm 105as a background job listening to port 8091 and reflecting the packets 106back to the socket. 107.Pp 108.Dl "ipfw add 2864 divert 8091 ip from 192.0.2.101" 109.Pp 110Example 111.Xr ipfw 8 112rule to divert all packets from 192.0.2.101 to port 8091. 113See 114.Xr ipfw 8 115for details. 116.Sh SEE ALSO 117.Xr tcpdump 1 , 118.Xr pcap 3 , 119.Xr divert 4 , 120.Xr ipfw 8 121.Sh HISTORY 122The 123.Nm 124utility first appeared in 125.Fx 7.0 . 126.Sh AUTHORS 127.An -nosplit 128.Nm 129was written by 130.An P. Kern Aq Mt pkern@cns.utoronto.ca . 131This manual page was written by 132.An Niclas Zeising Aq Mt zeising@FreeBSD.org . 133