2004-06-16 23:26:00 +00:00
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.\" $OpenBSD: pflogd.8,v 1.24 2004/01/16 10:45:49 jmc Exp $
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2004-02-28 16:52:45 +00:00
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.\"
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.\" Copyright (c) 2001 Can Erkin Acar. 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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.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
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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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.Dd July 9, 2001
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.Dt PFLOGD 8
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.Os
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.Sh NAME
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.Nm pflogd
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.Nd packet filter logging daemon
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.Sh SYNOPSIS
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.Nm pflogd
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.Op Fl Dx
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.Op Fl d Ar delay
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.Op Fl f Ar filename
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.Op Fl s Ar snaplen
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.Op Ar expression
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.Sh DESCRIPTION
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.Nm
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is a background daemon which reads packets logged by
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.Xr pf 4
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to the packet logging interface
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.Pa pflog0
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and writes the packets to a logfile (normally
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.Pa /var/log/pflog )
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in
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.Xr tcpdump 8
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binary format.
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These logs can be reviewed later using the
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.Fl r
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option of
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.Xr tcpdump 8 ,
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hopefully offline in case there are bugs in the packet parsing code of
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.Xr tcpdump 8 .
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.Pp
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.Nm
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closes and then re-opens the log file when it receives
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.Dv SIGHUP ,
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permitting
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.Xr newsyslog 8
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to rotate logfiles automatically.
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.Dv SIGALRM
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causes
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.Nm
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to flush the current logfile buffers to the disk, thus making the most
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recent logs available.
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The buffers are also flushed every
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.Ar delay
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seconds.
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.Pp
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If the log file contains data after a restart or a
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.Dv SIGHUP ,
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new logs are appended to the existing file.
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If the existing log file was created with a different snaplen,
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.Nm
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temporarily uses the old snaplen to keep the log file consistent.
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.Pp
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.Nm
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tries to preserve the integrity of the log file against I/O errors.
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Furthermore, integrity of an existing log file is verified before
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appending.
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If there is an invalid log file or an I/O error, logging is suspended until a
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.Dv SIGHUP
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or a
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.Dv SIGALRM
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is received.
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl D
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Debugging mode.
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.Nm
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does not disassociate from the controlling terminal.
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.It Fl d Ar delay
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Time in seconds to delay between automatic flushes of the file.
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This may be specified with a value between 5 and 3600 seconds.
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If not specified, the default is 60 seconds.
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.It Fl f Ar filename
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Log output filename.
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Default is
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.Pa /var/log/pflog .
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.It Fl s Ar snaplen
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Analyze at most the first
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.Ar snaplen
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bytes of data from each packet rather than the default of 96.
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The default of 96 is adequate for IP, ICMP, TCP, and UDP headers but may
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truncate protocol information for other protocols.
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Other file parsers may desire a higher snaplen.
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.It Fl x
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Check the integrity of an existing log file, and return.
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.It Ar expression
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Selects which packets will be dumped, using the regular language of
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.Xr tcpdump 8 .
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.El
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.Sh FILES
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.Bl -tag -width /var/run/pflogd.pid -compact
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.It Pa /var/run/pflogd.pid
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Process ID of the currently running
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.Nm .
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.It Pa /var/log/pflog
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Default log file.
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.El
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.Sh EXAMPLES
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Log specific tcp packets to a different log file with a large snaplen
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(useful with a log-all rule to dump complete sessions):
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.Bd -literal -offset indent
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# pflogd -s 1600 -f suspicious.log port 80 and host evilhost
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.Ed
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.Pp
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Display binary logs:
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.Bd -literal -offset indent
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# tcpdump -n -e -ttt -r /var/log/pflog
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.Ed
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.Pp
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Display the logs in real time (this does not interfere with the
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operation of
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.Nm ) :
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.Bd -literal -offset indent
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# tcpdump -n -e -ttt -i pflog0
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.Ed
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.Pp
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Tcpdump has been extended to be able to filter on the pfloghdr
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structure defined in
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.Aq Ar net/if_pflog.h .
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Tcpdump can restrict the output
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to packets logged on a specified interface, a rule number, a reason,
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a direction, an IP family or an action.
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.Pp
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.Bl -tag -width "reason match " -compact
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.It ip
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Address family equals IPv4.
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.It ip6
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Address family equals IPv6.
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.It ifname kue0
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Interface name equals "kue0".
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.It on kue0
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Interface name equals "kue0".
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.It rulenum 10
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Rule number equals 10.
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.It reason match
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Reason equals match.
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Also accepts "bad-offset", "fragment", "short", "normalize" and "memory".
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.It action pass
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Action equals pass.
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Also accepts "block".
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.It inbound
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The direction was inbound.
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.It outbound
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The direction was outbound.
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.El
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.Pp
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Display the logs in real time of inbound packets that were blocked on
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the wi0 interface:
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.Bd -literal -offset indent
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# tcpdump -n -e -ttt -i pflog0 inbound and action block and on wi0
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.Ed
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.Sh SEE ALSO
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.Xr pcap 3 ,
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.Xr pf 4 ,
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.Xr pflog 4 ,
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.Xr pf.conf 5 ,
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.Xr newsyslog 8 ,
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.Xr tcpdump 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Ox 3.0 .
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.Sh AUTHORS
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Can Erkin Acar
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