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