forked from extern/shorewall_code
588 lines
12 KiB
Plaintext
588 lines
12 KiB
Plaintext
#
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# Shorewall 4.4 -- /usr/share/shorewall/lib.common.
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 2010 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# The purpose of this library is to hold those functions used by both the CLI and by the
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# generated firewall scripts. To avoid versioning issues, it is copied into generated
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# scripts rather than loaded at run-time.
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#
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#
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# Get the Shorewall version of the passed script
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#
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get_script_version() { # $1 = script
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local temp
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local version
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local ifs
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local digits
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local verbosity
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verbosity="$VERBOSITY"
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VERBOSITY=0
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temp=$( $SHOREWALL_SHELL $1 version | sed 's/-.*//' )
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if [ $? -ne 0 ]; then
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version=0
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else
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ifs=$IFS
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IFS=.
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temp=$(echo $temp)
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IFS=$ifs
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digits=0
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for temp in $temp; do
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version=${version}$(printf '%02d' $temp)
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digits=$(($digits + 1))
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[ $digits -eq 3 ] && break
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done
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fi
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echo $version
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VERBOSITY="$verbosity"
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}
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#
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# Do required exports or create the required option string and run the passed script using
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# $SHOREWALL_SHELL
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#
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run_it() {
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local script
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local options
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local version
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export VARDIR
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script=$1
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shift
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version=$(get_script_version $script)
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if [ $version -lt 040408 ]; then
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#
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# Old script that doesn't understand 4.4.8 script options
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#
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export RESTOREFILE
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export VERBOSITY
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export NOROUTES=$g_noroutes
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export PURGE=$g_purge
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export TIMESTAMP=$g_timestamp
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export RECOVERING=$g_recovering
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if [ "$g_product" != Shorewall ]; then
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#
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# Shorewall Lite
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#
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export LOGFORMAT
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export IPTABLES
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fi
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else
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#
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# 4.4.8 or later -- no additional exports required
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#
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if [ x$1 = xtrace -o x$1 = xdebug ]; then
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options="$1 -"
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shift;
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else
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options='-'
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fi
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[ -n "$g_noroutes" ] && options=${options}n
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[ -n "$g_timestamp" ] && options=${options}t
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[ -n "$g_purge" ] && options=${options}p
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[ -n "$g_recovering" ] && options=${options}r
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options="${options}V $VERBOSITY"
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[ -n "$RESTOREFILE" ] && options="${options} -R $RESTOREFILE"
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fi
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$SHOREWALL_SHELL $script $options $@
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}
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#
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# Message to stderr
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#
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error_message() # $* = Error Message
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{
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echo " $@" >&2
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}
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#
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# Split a colon-separated list into a space-separated list
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#
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split() {
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local ifs
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ifs=$IFS
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IFS=:
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echo $*
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IFS=$ifs
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}
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#
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# Search a list looking for a match -- returns zero if a match found
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# 1 otherwise
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#
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list_search() # $1 = element to search for , $2-$n = list
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{
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local e
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e=$1
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while [ $# -gt 1 ]; do
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shift
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[ "x$e" = "x$1" ] && return 0
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done
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return 1
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}
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#
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# Suppress all output for a command
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#
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qt()
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{
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"$@" >/dev/null 2>&1
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}
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#
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# Suppress all output and input - mainly for preventing leaked file descriptors
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# to avoid SELinux denials
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#
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qtnoin()
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{
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"$@" </dev/null >/dev/null 2>&1
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}
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qt1()
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{
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local status
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while [ 1 ]; do
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"$@" </dev/null >/dev/null 2>&1
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status=$?
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[ $status -ne 4 ] && return $status
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done
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}
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#
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# Determine if Shorewall is "running"
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#
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shorewall_is_started() {
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qt1 $IPTABLES -L shorewall -n
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}
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#
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# Echos the fully-qualified name of the calling shell program
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#
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my_pathname() {
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cd $(dirname $0)
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echo $PWD/$(basename $0)
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}
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#
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# Source a user exit file if it exists
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#
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run_user_exit() # $1 = file name
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{
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local user_exit
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user_exit=$(find_file $1)
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if [ -f $user_exit ]; then
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progress_message "Processing $user_exit ..."
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. $user_exit
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fi
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}
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#
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# Load a Kernel Module -- assumes that the variable 'moduledirectories' contains
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# a space-separated list of directories to search for
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# the module and that 'moduleloader' contains the
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# module loader command.
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#
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loadmodule() # $1 = module name, $2 - * arguments
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{
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local modulename
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modulename=$1
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local modulefile
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local suffix
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if [ -d /sys/module/ ]; then
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if ! list_search $modulename $DONT_LOAD; then
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if [ ! -d /sys/module/$modulename ]; then
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shift
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for suffix in $MODULE_SUFFIX ; do
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for directory in $moduledirectories; do
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modulefile=$directory/${modulename}.${suffix}
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if [ -f $modulefile ]; then
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case $moduleloader in
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insmod)
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insmod $modulefile $*
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;;
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*)
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modprobe $modulename $*
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;;
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esac
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break 2
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fi
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done
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done
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fi
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fi
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elif ! list_search $modulename $DONT_LOAD $MODULES; then
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shift
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for suffix in $MODULE_SUFFIX ; do
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for directory in $moduledirectories; do
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modulefile=$directory/${modulename}.${suffix}
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if [ -f $modulefile ]; then
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case $moduleloader in
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insmod)
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insmod $modulefile $*
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;;
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*)
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modprobe $modulename $*
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;;
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esac
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break 2
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fi
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done
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done
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fi
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}
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#
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# Reload the Modules
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#
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reload_kernel_modules() {
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local save_modules_dir
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save_modules_dir=$MODULESDIR
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local directory
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local moduledirectories
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moduledirectories=
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local moduleloader
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moduleloader=modprobe
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local uname
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if ! qt mywhich modprobe; then
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moduleloader=insmod
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fi
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[ -n "${MODULE_SUFFIX:=ko ko.gz o o.gz gz}" ]
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[ -z "$MODULESDIR" ] && \
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uname=$(uname -r) && \
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MODULESDIR=/lib/modules/$uname/kernel/net/ipv4/netfilter:/lib/modules/$uname/kernel/net/netfilter:/lib/modules/$uname/kernel/net/sched:/lib/modules/$uname/extra:/lib/modules/$uname/extra/ipset
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[ -d /sys/module/ ] || MODULES=$(lsmod | cut -d ' ' -f1)
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for directory in $(split $MODULESDIR); do
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[ -d $directory ] && moduledirectories="$moduledirectories $directory"
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done
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[ -n "$moduledirectories" ] && while read command; do
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eval $command
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done
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MODULESDIR=$save_modules_dir
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}
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#
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# Load kernel modules required for Shorewall
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#
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load_kernel_modules() # $1 = Yes, if we are to save moduleinfo in $VARDIR
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{
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local save_modules_dir
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save_modules_dir=$MODULESDIR
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local directory
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local moduledirectories
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moduledirectories=
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local moduleloader
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moduleloader=modprobe
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local savemoduleinfo
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savemoduleinfo=${1:-Yes} # So old compiled scripts still work
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local uname
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if ! qt mywhich modprobe; then
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moduleloader=insmod
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fi
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[ -n "${MODULE_SUFFIX:=o gz ko o.gz ko.gz}" ]
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[ -z "$MODULESDIR" ] && \
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uname=$(uname -r) && \
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MODULESDIR=/lib/modules/$uname/kernel/net/ipv4/netfilter:/lib/modules/$uname/kernel/net/netfilter:/lib/modules/$uname/kernel/net/sched:/lib/modules/$uname/extra:/lib/modules/$uname/extra/ipset
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for directory in $(split $MODULESDIR); do
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[ -d $directory ] && moduledirectories="$moduledirectories $directory"
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done
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[ -n "$LOAD_HELPERS_ONLY" ] && modules=$(find_file helpers) || modules=$(find_file modules)
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if [ -f $modules -a -n "$moduledirectories" ]; then
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[ -d /sys/module/ ] || MODULES=$(lsmod | cut -d ' ' -f1)
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progress_message "Loading Modules..."
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. $modules
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if [ $savemoduleinfo = Yes ]; then
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[ -d ${VARDIR} ] || mkdir -p ${VARDIR}
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echo MODULESDIR="$MODULESDIR" > ${VARDIR}/.modulesdir
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cp -f $modules ${VARDIR}/.modules
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fi
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elif [ $savemoduleinfo = Yes ]; then
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[ -d ${VARDIR} ] || mkdir -p ${VARDIR}
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> ${VARDIR}/.modulesdir
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> ${VARDIR}/.modules
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fi
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MODULESDIR=$save_modules_dir
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}
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#
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# Note: The following set of IP address manipulation functions have anomalous
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# behavior when the shell only supports 32-bit signed arithmetic and
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# the IP address is 128.0.0.0 or 128.0.0.1.
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#
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LEFTSHIFT='<<'
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#
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# Convert an IP address in dot quad format to an integer
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#
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decodeaddr() {
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local x
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local temp
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temp=0
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local ifs
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ifs=$IFS
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IFS=.
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for x in $1; do
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temp=$(( $(( $temp $LEFTSHIFT 8 )) | $x ))
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done
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echo $temp
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IFS=$ifs
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}
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#
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# convert an integer to dot quad format
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#
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encodeaddr() {
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addr=$1
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local x
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local y
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y=$(($addr & 255))
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for x in 1 2 3 ; do
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addr=$(($addr >> 8))
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y=$(($addr & 255)).$y
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done
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echo $y
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}
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#
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# Netmask from CIDR
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#
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ip_netmask() {
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local vlsm
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vlsm=${1#*/}
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[ $vlsm -eq 0 ] && echo 0 || echo $(( -1 $LEFTSHIFT $(( 32 - $vlsm )) ))
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}
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#
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# Network address from CIDR
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#
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ip_network() {
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local decodedaddr
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decodedaddr=$(decodeaddr ${1%/*})
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local netmask
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netmask=$(ip_netmask $1)
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echo $(encodeaddr $(($decodedaddr & $netmask)))
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}
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#
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# The following hack is supplied to compensate for the fact that many of
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# the popular light-weight Bourne shell derivatives don't support XOR ("^").
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#
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ip_broadcast() {
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local x
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x=$(( 32 - ${1#*/} ))
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[ $x -eq 32 ] && echo -1 || echo $(( $(( 1 $LEFTSHIFT $x )) - 1 ))
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}
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#
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# Calculate broadcast address from CIDR
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#
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broadcastaddress() {
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local decodedaddr
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decodedaddr=$(decodeaddr ${1%/*})
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local netmask
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netmask=$(ip_netmask $1)
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local broadcast
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broadcast=$(ip_broadcast $1)
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echo $(encodeaddr $(( $(($decodedaddr & $netmask)) | $broadcast )))
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}
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#
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# Test for network membership
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#
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in_network() # $1 = IP address, $2 = CIDR network
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{
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local netmask
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netmask=$(ip_netmask $2)
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#
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# Use string comparison to work around a broken BusyBox ash in OpenWRT
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#
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test $(( $(decodeaddr $1) & $netmask)) = $(( $(decodeaddr ${2%/*}) & $netmask ))
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}
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#
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# Find interface address--returns the first IP address assigned to the passed
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# device
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#
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find_first_interface_address() # $1 = interface
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{
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#
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# get the line of output containing the first IP address
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#
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addr=$(${IP:-ip} -f inet addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
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#
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# If there wasn't one, bail out now
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#
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[ -n "$addr" ] || startup_error "Can't determine the IP address of $1"
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#
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# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
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# along with everything else on the line
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#
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echo $addr | sed 's/\s*inet //;s/\/.*//;s/ peer.*//'
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}
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find_first_interface_address_if_any() # $1 = interface
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{
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#
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# get the line of output containing the first IP address
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#
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addr=$(${IP:-ip} -f inet addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
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#
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# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
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# along with everything else on the line
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#
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[ -n "$addr" ] && echo $addr | sed 's/\s*inet //;s/\/.*//;s/ peer.*//' || echo 0.0.0.0
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}
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#
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# Internal version of 'which'
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#
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mywhich() {
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local dir
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for dir in $(split $PATH); do
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if [ -x $dir/$1 ]; then
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echo $dir/$1
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return 0
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fi
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done
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return 2
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}
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#
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# Query NetFilter about the existence of a filter chain
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#
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chain_exists() # $1 = chain name
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{
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qt1 $IPTABLES -L $1 -n
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}
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#
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# Find a File -- For relative file name, look in each ${CONFIG_PATH} then ${CONFDIR}
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#
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find_file()
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{
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local saveifs
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saveifs=
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local directory
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case $1 in
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/*)
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echo $1
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;;
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*)
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for directory in $(split $CONFIG_PATH); do
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if [ -f $directory/$1 ]; then
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echo $directory/$1
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return
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fi
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done
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echo ${CONFDIR}/$1
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;;
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esac
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}
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#
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# Set the Shorewall state
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#
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set_state () # $1 = state $2
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{
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if [ $# -gt 1 ]; then
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echo "$1 ($(date)) from $2" > ${VARDIR}/state
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else
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echo "$1 ($(date))" > ${VARDIR}/state
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fi
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}
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#
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# Perform variable substitution on the passed argument and echo the result
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#
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expand() # $@ = contents of variable which may be the name of another variable
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{
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eval echo \"$@\"
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}
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#
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# Function for including one file into another
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#
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INCLUDE() {
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. $(find_file $(expand $@))
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}
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# Function to truncate a string -- It uses 'cut -b -<n>'
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# rather than ${v:first:last} because light-weight shells like ash and
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# dash do not support that form of expansion.
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#
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truncate() # $1 = length
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{
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cut -b -${1}
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}
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