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.\" Copyright (c) 2006 Niclas Zeising <zeising@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd May 22, 2006
.Dt IPFWPCAP 8
.Os
.Sh NAME
.Nm ipfwpcap
.Nd "copy diverted packets to a file in tcpdump format"
.Sh SYNOPSIS
.Nm
.Op Fl dr
.Op Fl b Ar maxbytes
.Op Fl p Ar maxpkts
.Op Fl P Ar pidfile
.Ar portnum
.Ar dumpfile
.Sh DESCRIPTION
The
.Nm
utility is used to copy diverted packets to a file in
.Xr tcpdump 1
format.
The interesting packets are diverted by
.Xr ipfw 8
to a port on which
.Nm
listens.
The packets are then dropped unless
.Fl r
is used.
.Pp
The options are as follows:
.Bl -tag -width indent
.It Fl d
Turns on extra debugging messages.
.It Fl r
Writes packets back to the
.Xr divert 4
socket.
.It Fl rr
Indicates that it is okay to quit if
.Ar maxbytes
or
.Ar maxpkts
are reached.
Diverted packets will silently disappear if nothing is listening on the
.Xr divert 4
socket.
.It Fl b Ar maxbytes
Stop dumping after
.Ar maxbytes
bytes.
.It Fl p Ar maxpkts
Stop dumping after
.Ar maxpkt
packets.
.It Fl P Ar pidfile
File to store PID number in.
Default is
.Pa /var/run/ipwfpcap.portnr.pid .
.El
.Pp
The
.Ar portnum
argument specifies which
.Xr divert 4
socket port to listen on.
The
.Ar dumpfile
argument is the path to the file to write captured packets to.
Specify
.Sq Fl
to write to stdout.
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
.Dl "ipfwpcap -r 8091 divt.log &"
.Pp
Starts
.Nm
as a background job listening to port 8091 and reflecting the packets
back to the socket.
.Pp
.Dl "ipfw add 2864 divert 8091 ip from 192.0.2.101"
.Pp
Example
.Xr ipfw 8
rule to divert all packets from 192.0.2.101 to port 8091.
See
.Xr ipfw 8
for details.
.Sh SEE ALSO
.Xr tcpdump 1 ,
.Xr pcap 3 ,
.Xr divert 4 ,
.Xr ipfw 8
.Sh HISTORY
The
.Nm
utility first appeared in
.Fx 7.0 .
.Sh AUTHORS
.An -nosplit
.Nm
was written by
.An P. Kern Aq Mt pkern@cns.utoronto.ca .
This manual page was written by
.An Niclas Zeising Aq Mt zeising@FreeBSD.org .
|
