Teach periodic(8) security output to display information about blocked

packet counts by pf(4).

This adds a ``daily_status_security_pfdenied_enable'' variable to
periodic.conf, which defaults to ``YES'' as the matching IPF(W) versions.

The output will look like this (line wrapped):

  pf denied packets:
  > block drop log on rl0 proto tcp all [ Evaluations: 504986 Packets: 0
    Bytes: 0 States: 0 ]
  > block drop log on rl0 all [ Evaluations: 18559 Packets: 427 Bytes: 140578
    States: 0 ]

Submitted by:	clive (thanks a lot!)
MFC after:	2 weeks

etc/defaults/periodic.conf

@@ -150,6 +150,9 @@ daily_status_security_ipfwdenied_enable="YES"
 # 510.ipfdenied
 daily_status_security_ipfdenied_enable="YES"
 
+# 520.pfdenied
+daily_status_security_pfdenied_enable="YES"
+
 # 550.ipfwlimit
 daily_status_security_ipfwlimit_enable="YES"
 

etc/periodic/security/520.pfdenied

@@ -0,0 +1,53 @@
+#!/bin/sh -
+#
+# Copyright (c) 2004  The FreeBSD Project
+# 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.
+#
+# $FreeBSD$
+#
+
+# If there is a global system configuration file, suck it in.
+#
+if [ -r /etc/defaults/periodic.conf ]
+then
+    . /etc/defaults/periodic.conf
+    source_periodic_confs
+fi
+
+. /etc/periodic/security/security.functions
+
+rc=0
+
+case "$daily_status_security_pfdenied_enable" in
+    [Yy][Ee][Ss])
+	TMP=`mktemp -t security`
+	if pfctl -sr -v 2>/dev/null | nawk '{if (/^block/) {buf=$0; getline; gsub(" +"," ",$0); print buf$0;} }' > ${TMP}; then
+	  check_diff new_only pf ${TMP} "${host} pf denied packets:"
+	fi
+	rc=$?
+	rm -f ${TMP};;
+    *)	rc=0;;
+esac
+
+exit $rc

etc/periodic/security/Makefile

@@ -6,6 +6,7 @@ FILES=	100.chksetuid \
 	400.passwdless \
 	500.ipfwdenied \
 	510.ipfdenied \
+	520.pfdenied \
 	550.ipfwlimit \
 	600.ip6fwdenied \
 	650.ip6fwlimit \

share/man/man5/periodic.conf.5

@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 30, 2004
+.Dd November 24, 2004
 .Dt PERIODIC.CONF 5
 .Os
 .Sh NAME
@@ -494,6 +494,13 @@ Set to
 to show log entries for packets denied by
 .Xr ipf 8
 since yesterday's check.
+.It Va daily_status_security_pfdenied_enable
+.Pq Vt bool
+Set to
+.Dq YES
+to show log entries for packets denied by
+.Xr pf 4
+since yesterday's check.
 .It Va daily_status_security_ipfwlimit_enable
 .Pq Vt bool
 Set to