108 lines
2.9 KiB
Groff
108 lines
2.9 KiB
Groff
.\" $OpenBSD: pflog.4,v 1.9 2006/10/25 12:51:31 jmc Exp $
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.\"
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.\" Copyright (c) 2001 Tobias Weingartner
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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 ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 10, 2001
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.Dt PFLOG 4
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.Os
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.Sh NAME
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.Nm pflog
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.Nd packet filter logging interface
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.Sh SYNOPSIS
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.Cd "device pflog"
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.Sh DESCRIPTION
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The
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.Nm pflog
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interface is a pseudo-device which makes visible all packets logged by
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the packet filter,
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.Xr pf 4 .
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Logged packets can easily be monitored in real
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time by invoking
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.Xr tcpdump 1
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on the
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.Nm
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interface, or stored to disk using
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.Xr pflogd 8 .
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.Pp
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The pflog0 interface is created automatically at boot if both
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.Xr pf 4
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and
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.Xr pflogd 8
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are enabled;
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further instances can be created using
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.Xr ifconfig 8 .
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.Pp
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Each packet retrieved on this interface has a header associated
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with it of length
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.Dv PFLOG_HDRLEN .
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This header documents the address family, interface name, rule
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number, reason, action, and direction of the packet that was logged.
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This structure, defined in
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.Aq Pa net/if_pflog.h
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looks like
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.Bd -literal -offset indent
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struct pfloghdr {
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u_int8_t length;
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sa_family_t af;
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u_int8_t action;
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u_int8_t reason;
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char ifname[IFNAMSIZ];
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char ruleset[PF_RULESET_NAME_SIZE];
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u_int32_t rulenr;
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u_int32_t subrulenr;
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uid_t uid;
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pid_t pid;
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uid_t rule_uid;
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pid_t rule_pid;
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u_int8_t dir;
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u_int8_t pad[3];
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};
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.Ed
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.Sh EXAMPLES
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Create a
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.Nm
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interface
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and monitor all packets logged on it:
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.Bd -literal -offset indent
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# ifconfig pflog1 up
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# tcpdump -n -e -ttt -i pflog1
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.Ed
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.Sh SEE ALSO
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.Xr tcpdump 1
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.Xr inet 4 ,
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.Xr inet6 4 ,
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.Xr netintro 4 ,
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.Xr pf 4 ,
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.Xr ifconfig 8 ,
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.Xr pflogd 8
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.Sh HISTORY
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The
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.Nm
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device first appeared in
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.Ox 3.0 .
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.\" .Sh BUGS
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.\" Anything here?
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