forked from extern/shorewall_code
761 lines
16 KiB
Plaintext
761 lines
16 KiB
Plaintext
#
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# Shorewall 5.0 -- /usr/share/shorewall/lib.common.
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#
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# (c) 2010-2015 - 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 part of Shorewall.
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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 the GNU General Public License as published by the
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# Free Software Foundation, either version 2 of the license or, at your
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# option, any later version.
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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, see <http://www.gnu.org/licenses/>.
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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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#
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# Issue a message and stop
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#
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startup_error() # $* = Error Message
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{
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echo " ERROR: $@: Firewall state not changed" >&2
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%_b %d %T') "
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echo "${timestamp} ERROR: $@" >> $STARTUP_LOG
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fi
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case $COMMAND in
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start)
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logger -p kern.err "ERROR:$g_product start failed:Firewall state not changed"
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;;
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restart)
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logger -p kern.err "ERROR:$g_product restart failed:Firewall state not changed"
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;;
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restore)
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logger -p kern.err "ERROR:$g_product restore failed:Firewall state not changed"
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;;
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esac
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if [ $LOG_VERBOSITY -ge 0 ]; then
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timestamp="$(date +'%_b %d %T') "
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case $COMMAND in
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start)
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echo "${timestamp} ERROR:$g_product start failed:Firewall state not changed" >> $STARTUP_LOG
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;;
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restart)
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echo "${timestamp} ERROR:$g_product restart failed:Firewall state not changed" >> $STARTUP_LOG
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;;
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restore)
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echo "${timestamp} ERROR:$g_product restore failed:Firewall state not changed" >> $STARTUP_LOG
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;;
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esac
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fi
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mutex_off
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kill $$
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exit 2
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}
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#
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# 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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export VARDIR
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script=$1
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shift
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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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[ -n "$g_counters" ] && options=${options}c
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options="${options}V $VERBOSITY"
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[ -n "$RESTOREFILE" ] && options="${options} -R $RESTOREFILE"
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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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return 1
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}
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#
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# Undo the effect of 'split()'
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#
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join()
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{
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local f
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local o
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o=
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for f in $* ; do
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o="${o:+$o:}$f"
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done
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echo $o
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}
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#
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# Return the number of elements in a list
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#
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list_count() # $* = list
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{
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return $#
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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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# Split a comma-separated list into a space-separated list
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#
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split_list() {
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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[6] is "running"
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#
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product_is_started() {
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qt1 $g_tool -L shorewall -n
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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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shorewall6_is_started() {
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qt1 $IP6TABLES -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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local pwd
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pwd=$PWD
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cd $(dirname $0)
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echo $PWD/$(basename $0)
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cd $pwd
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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 ko.xz o o.gz o.xz gz xz}" ]
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[ -z "$MODULESDIR" ] && \
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uname=$(uname -r) && \
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MODULESDIR=/lib/modules/$uname/kernel/net/ipv${g_family}/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 xz ko o.gz o.xz ko.gz ko.xz}" ]
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[ -z "$MODULESDIR" ] && \
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uname=$(uname -r) && \
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MODULESDIR=/lib/modules/$uname/kernel/net/ipv${g_family}/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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# 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 $g_tool -L $1 -n
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}
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#
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# Find the interface with the passed MAC address
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#
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find_interface_by_mac() {
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local mac
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mac=$1
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local first
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local second
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local rest
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local dev
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$IP link list | while read first second rest; do
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case $first in
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*:)
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dev=$second
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;;
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*)
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if [ "$second" = $mac ]; then
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echo ${dev%:}
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return
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fi
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esac
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done
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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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if [ $g_family -eq 4 ]; then
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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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else
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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 inet6 addr show dev $1 2> /dev/null | grep -F 'inet6 ' | grep -vF 'scope link' | 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 IPv6 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*inet6 //;s/\/.*//;s/ peer.*//'
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fi
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}
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find_first_interface_address_if_any() # $1 = interface
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{
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if [ $g_family -eq 4 ]; then
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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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else
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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 inet6 addr show dev $1 2> /dev/null | grep -F 'inet6 ' | grep -vF 'scope link' | 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*inet6 //;s/\/.*//;s/ peer.*//' || echo ::
|
|
fi
|
|
}
|
|
|
|
#
|
|
#Determines if the passed interface is a loopback interface
|
|
#
|
|
loopback_interface() { #$1 = Interface name
|
|
[ "$1" = lo ] || $IP link show $1 | fgrep -q LOOPBACK
|
|
}
|
|
|
|
#
|
|
# Find Loopback Interfaces
|
|
#
|
|
find_loopback_interfaces() {
|
|
local interfaces
|
|
|
|
[ -x "$IP" ] && interfaces=$($IP link show | fgrep LOOPBACK | sed 's/://g' | cut -d ' ' -f 2)
|
|
|
|
[ -n "$interfaces" ] && echo $interfaces || echo lo
|
|
}
|
|
|
|
#
|
|
# Internal version of 'which'
|
|
#
|
|
mywhich() {
|
|
local dir
|
|
|
|
for dir in $(split $PATH); do
|
|
if [ -x $dir/$1 ]; then
|
|
echo $dir/$1
|
|
return 0
|
|
fi
|
|
done
|
|
|
|
return 2
|
|
}
|
|
|
|
#
|
|
# Find a File -- For relative file name, look in each ${CONFIG_PATH} then ${CONFDIR}
|
|
#
|
|
find_file()
|
|
{
|
|
local saveifs
|
|
saveifs=
|
|
local directory
|
|
|
|
case $1 in
|
|
/*)
|
|
echo $1
|
|
;;
|
|
*)
|
|
for directory in $(split $CONFIG_PATH); do
|
|
if [ -f $directory/$1 ]; then
|
|
echo $directory/$1
|
|
return
|
|
fi
|
|
done
|
|
|
|
if [ -n "$g_shorewalldir" ]; then
|
|
echo ${g_shorewalldir}/$1
|
|
else
|
|
echo ${g_confdir}/$1
|
|
fi
|
|
;;
|
|
esac
|
|
}
|
|
|
|
#
|
|
# Set the Shorewall state
|
|
#
|
|
set_state () # $1 = state
|
|
{
|
|
if [ $# -gt 1 ]; then
|
|
echo "$1 ($(date)) from $2" > ${VARDIR}/state
|
|
else
|
|
echo "$1 ($(date))" > ${VARDIR}/state
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Perform variable substitution on the passed argument and echo the result
|
|
#
|
|
expand() # $@ = contents of variable which may be the name of another variable
|
|
{
|
|
eval echo \"$@\"
|
|
}
|
|
|
|
#
|
|
# Function for including one file into another
|
|
#
|
|
INCLUDE() {
|
|
. $(find_file $(expand $@))
|
|
}
|
|
|
|
# Function to truncate a string -- It uses 'cut -b -<n>'
|
|
# rather than ${v:first:last} because light-weight shells like ash and
|
|
# dash do not support that form of expansion.
|
|
#
|
|
|
|
truncate() # $1 = length
|
|
{
|
|
cut -b -${1}
|
|
}
|
|
|
|
#
|
|
# Call this function to assert mutual exclusion with Shorewall. If you invoke the
|
|
# /sbin/shorewall program while holding mutual exclusion, you should pass "nolock" as
|
|
# the first argument. Example "shorewall nolock refresh"
|
|
#
|
|
# This function uses the lockfile utility from procmail if it exists.
|
|
# Otherwise, it uses a somewhat race-prone algorithm to attempt to simulate the
|
|
# behavior of lockfile.
|
|
#
|
|
mutex_on()
|
|
{
|
|
local try
|
|
try=0
|
|
local lockf
|
|
lockf=${LOCKFILE:=${VARDIR}/lock}
|
|
local lockpid
|
|
|
|
MUTEX_TIMEOUT=${MUTEX_TIMEOUT:-60}
|
|
|
|
if [ $MUTEX_TIMEOUT -gt 0 ]; then
|
|
|
|
[ -d ${VARDIR} ] || mkdir -p ${VARDIR}
|
|
|
|
if [ -f $lockf ]; then
|
|
lockpid=`cat ${lockf} 2> /dev/null`
|
|
if [ -z "$lockpid" -o $lockpid = 0 ]; then
|
|
rm -f ${lockf}
|
|
error_message "WARNING: Stale lockfile ${lockf} removed"
|
|
elif [ $lockpid -eq $$ ]; then
|
|
return 0
|
|
elif ! qt ps p ${lockpid}; then
|
|
rm -f ${lockf}
|
|
error_message "WARNING: Stale lockfile ${lockf} from pid ${lockpid} removed"
|
|
fi
|
|
fi
|
|
|
|
if qt mywhich lockfile; then
|
|
lockfile -${MUTEX_TIMEOUT} -r1 ${lockf}
|
|
chmod u+w ${lockf}
|
|
echo $$ > ${lockf}
|
|
chmod u-w ${lockf}
|
|
else
|
|
while [ -f ${lockf} -a ${try} -lt ${MUTEX_TIMEOUT} ] ; do
|
|
sleep 1
|
|
try=$((${try} + 1))
|
|
done
|
|
|
|
if [ ${try} -lt ${MUTEX_TIMEOUT} ] ; then
|
|
# Create the lockfile
|
|
echo $$ > ${lockf}
|
|
else
|
|
echo "Giving up on lock file ${lockf}" >&2
|
|
fi
|
|
fi
|
|
fi
|
|
}
|
|
|
|
#
|
|
# Call this function to release mutual exclusion
|
|
#
|
|
mutex_off()
|
|
{
|
|
rm -f ${LOCKFILE:=${VARDIR}/lock}
|
|
}
|
|
|