X-Git-Url: http://git.pk910.de/?p=ircu2.10.12-pk.git;a=blobdiff_plain;f=tools%2Flinesync%2Flinesync.sh;fp=tools%2Flinesync%2Flinesync.sh;h=63da3000e603bc838b4baa97f87285de31a6b965;hp=0000000000000000000000000000000000000000;hb=0400a5a6479398d82526785c18c0df8bc8b92dce;hpb=d17e10da972ce5776c60b4c317267c6abe0e1ead

diff --git a/tools/linesync/linesync.sh b/tools/linesync/linesync.sh
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+#!/bin/sh
+# linesync.sh, Copyright (c) 2002 Arjen Wolfs
+# 20020604, sengaia@undernet.org
+# 20050417, daniel@undernet.org  - modified for u2.10.12
+# $Id$
+#
+# The code contained is in this file is licenced under the terms
+# and conditions as specified in the GNU General Public License.
+#
+# linesync.sh - centralized ircd.conf updates.
+# The purpose of this little shell script is to allow a section of an ircd.conf to be 
+# updated from a central location. Hence it is intended to facilitate the automated 
+# distribution of Kill, Jupe, Quarantine and Uworld lines; or any other .conf lines you 
+# may wish to keep synchronized accross all servers on a network.
+#
+# This script will download a file called linesync from a specified web server (see 
+# below for configuration), and calculate an md5sum from it. It will then download
+# a file called linesync.sum from a configurable number of other web servers and
+# compare the contents of these files against the checksum calculated. If any of the
+# downloaded checksums mismatch, the program will abort. This provides security to
+# the centralized update mechanism - in order for it to be compromised, multiple
+# web servers would have to compromised.
+#
+# If all checksums match, the script inspects the .conf lines contained within the 
+# downloaded file. If any .conf lines are found that are not specifically allowed,
+# the program will abort. This will prevent malicious/dangerous .conf lines (such as
+# Operator or Connect lines) from being inserted into ircd.conf.
+#
+# If all the checks mentioned above are passed, the script checks ircd.conf for a section
+# that begins with "# BEGIN LINESYNC", and ends with "# END LINESYNC". The section contained
+# between these two comments is the section maintained by this program. If these lines are not
+# found in the ircd.conf, they will be appended to it.
+# Next, the script will build a new ircd.conf by removing all lines present between the two
+# commented lines mentioned above, and replace them with the contents of the file downloaded.
+# 
+# Once this has been completed, ircd.conf is backed up and replaced with the newly built version,
+# and ircd will be rehashed. 
+#
+# Configuration: This script requires two parameters - the full path to your ircd.conf, and the
+# full path to your ircd.pid. It will look for a configuration file called linesync.conf in the
+# same directory as ircd.conf. See the included sample linesync.conf for information on how to
+# set it up. Obviously, you will need to have web server(s) to use for the distribution of your
+# .conf update and checksums. This script requires the presence of wget and md5sum, and various
+# other programs that should be present by default on any Unix system. 
+#
+# This program should be run from crontab, i.e something like:
+# 0 0 * * * /home/irc/bin/linesync.sh /home/irc/lib/ircd.conf /home/irc/lib/ircd.pid
+#
+# This program has been tested on and works on FreeBSD, Solaris, and Linux.
+# md5sum is included in GNU textutils.
+#
+#	Good Luck!
+#	Arjen Wolfs (sengaia@undernet.org), June 9 2002.
+#
+
+# This checks for the presence of an executable file in $PATH
+locate_program() {
+        if [ ! -x "`which $1 2>&1`" ]; then
+                echo "You don't seem to have $1. Sorry."
+                exit 1
+        fi
+}
+
+# This checks for the presence of any file
+check_file() {
+        if [ ! -f "$1" ]; then
+                echo "There doesn't appear to be a $1. Sorry."
+                exit 1
+        fi
+}
+
+# Try to find programs we will need
+locate_program wget && locate_program egrep && locate_program diff
+
+# try to find GNU awk
+awk_cmd=`which gawk`
+if [ $? -ne 0 ]; then
+        awk_cmd=""
+fi
+
+# try to find an appropriate md5 program
+# BSD md5 capability courtesy of spale
+md5_cmd=`which md5sum`
+if [ -z "$md5_cmd" ]; then
+	md5_cmd=`which md5`
+	if [ -z "$md5_cmd" ]; then
+		echo "No MD5 capable programs found (I looked for md5sum and md5)."
+		exit
+	else
+		md5_cmd="$md5_cmd -q"
+	fi
+fi
+
+if [ -z "$awk_cmd" ]; then
+	locate_program awk
+	is_gawk=`echo | awk --version | head -1 | egrep '^GNU.+$'`
+	if [ -z "$is_gawk" ]; then
+		echo "Your version of awk is not GNU awk. Sorry."
+		exit 1
+	fi
+	awk_cmd="awk"	
+fi
+
+# Check for required command line parameters
+if [ -z "$1" -o -z "$2" ]; then
+        echo "Usage: $0 <conf_path> <pid_path>"
+        echo "      <conf_path>     Full path to ircd.conf (/home/irc/lib/ircd.conf)"
+        echo "      <pid_path>      Full path to ircd.pid (/home/irc/lib/ircd.pid)"
+        exit 1
+fi
+
+# check and set up stuff
+diff_cmd="diff"
+cpath=$1
+ppath=$2
+check_file $cpath
+dpath=`dirname $cpath`
+lpath="$dpath/linesync.conf"
+check_file $lpath
+save_dir=$PWD; cd $dpath
+tpath=$PWD; cd $save_dir
+tmp_path="$dpath/tmp"
+mkdir $tmp_path > /dev/null 2>&1
+
+# load and check configuration
+. $lpath
+if [ -z "$LINE_SERVER" -o -z "$LINE_CHECK" -o -z "$ALLOWED_LINES" ]; then
+	echo "Please setup $lpath correctly."
+	exit 1
+fi
+
+# Not all versions of date support %s, work around it
+TS=`date +%Y%m%d%H%M%S`
+TMPFILE="$tmp_path/linesync.$TS"
+LSFILE="$LINE_SERVER""linesync"
+# Attempt to download our .conf update
+wget --cache=off --quiet --output-document=$TMPFILE $LSFILE > /dev/null 2>&1
+if [ ! -s "$TMPFILE" ]; then
+        echo "Unable to retrieve $LSFILE. Sorry."
+	rm $TMPFILE > /dev/null 2>&1
+        exit 1
+fi
+
+# Check whether the file contains any disallowed .conf lines
+bad_lines=`egrep '^[^'$ALLOWED_LINES'|#]+' $TMPFILE`
+if [ ! -z "$bad_lines" ]; then
+        echo "The file downloaded in $TMPFILE contains the following disallowed line(s):"
+        echo $bad_lines
+        exit 1
+fi
+
+# Check whether somebody tried to sneak a second block onto some line
+bad_lines=`egrep -i '}[ 	]*;[ 	]*[a-z]+[ 	]*{' $TMPFILE`
+if [ ! -z "$bad_lines" ] ; then
+	echo "The file downloaded in $TMPFILE contains the following multi-block line(s):"
+        echo $bad_lines
+        exit 1
+fi
+
+# check our ircd.conf
+ircd_setup=`egrep '^# (BEGIN|END) LINESYNC$' $cpath|wc -l`
+if [ $ircd_setup != 2 ]; then
+	cp $cpath $cpath.orig
+	echo "Performing initial merge on $cpath, original file saved as $cpath.orig."
+	
+        echo "# Do NOT remove the following line, linesync.sh depends on it!" >> $cpath
+        echo "# BEGIN LINESYNC" >> $cpath
+        echo "# END LINESYNC" >> $cpath
+        echo "# Do not remove the previous line, linesync.sh depends on it!" >> $cpath
+
+	# Do an initial merge to remove duplicates
+	inpath="$tmp_path/linesync.tmp.$TS"
+	$awk_cmd '
+	{
+                if (!loaded_template) {
+                        command="cat " tempfile; tlines=0;
+                        while ((command | getline avar) > 0) { template[tlines]=avar; tlines++ }
+                        close(command)
+                        loaded_template++
+                }
+		dup_line=0
+                for (i=0; i<tlines; i++) {
+                        if (tolower($0)==tolower(template[i])) { dup_line++; break }
+                }
+		if (!dup_line) print $0
+        } ' tempfile=$TMPFILE < $cpath > $inpath
+else
+	inpath=$cpath
+fi
+
+# Get the checksum
+CKSUM=`$md5_cmd $TMPFILE|cut -d' ' -f1`
+
+check_file="$tmp_path/linesync.sum.$TS"
+for ck_server in $LINE_CHECK; do
+	sumfile="$ck_server""linesync.sum"
+	wget --cache=off --quiet --output-document=$check_file $sumfile > /dev/null 2>&1
+	if [ ! -s "$check_file" ]; then
+		echo "Unable to retrieve checksum from $sumfile"
+		exit 1	
+	fi
+	if [ "$CKSUM" != "`cat $check_file`" ]; then
+		echo "Checksum retrieved from $sumfile does not match!"
+		exit 1
+	fi
+	rm -f $check_file
+done
+# It all checks out, proceed...
+
+# Replace the marked block in ircd.conf with the new version
+
+$awk_cmd ' 
+$0=="# BEGIN LINESYNC" { chop++; print; next }
+$0=="# END LINESYNC" {
+        command="cat " syncfile
+        while ((command | getline avar) > 0) { print avar }
+        close(command)
+        chop--
+}
+{ if (!chop) print $0 }
+' syncfile=$TMPFILE < $inpath > $tmp_path/linesync.new.$TS
+
+# run a diff between current and new confs to see if we updated anything
+# no point sending the ircd a -HUP if this is not needed, especially on a
+# busy network, such as Undernet.
+diff=`$diff_cmd $cpath $tmp_path/linesync.new.$TS`
+if [ ! -z "$diff" ]; then
+	# Changes were detected
+
+	# Back up the current ircd.conf and replace it with the new one
+	cp $cpath  $dpath/ircd.conf.bk
+	cp $tmp_path/linesync.new.$TS $cpath
+
+	# Rehash ircd (without caring wether or not it succeeds)
+	kill -HUP `cat $ppath 2>/dev/null` > /dev/null 2>&1
+fi
+
+# (Try to) clean up
+rm -rf $tmp_path > /dev/null 2>&1
+
+# That's it...