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