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Adding check-line to iptables script

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This commit is contained in:
Gyorgy Berenyi
2022-10-10 11:55:48 +00:00
parent 246819fdfa
commit 1217d8b0d6
1 changed files with 89 additions and 71 deletions
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38
firewall/firewall-add
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@@ -77,6 +77,7 @@ if [[ -z "$TYPE" ]]; then
TYPE="tcp" TYPE="tcp"
fi; fi;
if [[ -z "$SOURCE_IP" ]]; then
if [[ -z "$SOURCE" ]]; then if [[ -z "$SOURCE" ]]; then
SOURCE_IP="0.0.0.0/0"; SOURCE_IP="0.0.0.0/0";
@@ -111,7 +112,9 @@ else
fi; fi;
fi fi
fi
if [[ -z "$TARGET_IP" ]]; then
if [[ -z "$TARGET" ]]; then if [[ -z "$TARGET" ]]; then
TARGET_IP="0.0.0.0/0"; TARGET_IP="0.0.0.0/0";
@@ -146,22 +149,27 @@ else
fi; fi;
fi fi
fi
prerouting() { prerouting() {
LINES=$($IPTABLES -L --line-number -n | grep DNAT | grep $SOURCE_PORT |grep $TARGET_IP |grep $TARGET_PORT |grep $COMMENT | awk '{print $1}'| tac) LINES=$($IPTABLES -w 10 -L --line-number -n | grep DNAT | grep $SOURCE_PORT |grep $TARGET_IP |grep $TARGET_PORT |grep $COMMENT | awk '{print $1}'| tac)
debug "Previous prerouting lines: "$LINES debug "Previous prerouting lines: "$LINES
# DELETE UNECESSARY LINES FROM PREVIOUS RULES # DELETE UNECESSARY LINES FROM PREVIOUS RULES
if [ -n "$LINES" ] ; then if [ -n "$LINES" ] ; then
for i in $LINES; do for i in $LINES; do
debug "$IPTABLES -D PREROUTING $i" debug "$IPTABLES -D PREROUTING $i";
$IPTABLES -D PREROUTING $i $IPTABLES -w 10 -D PREROUTING $i
sleep 0.1 sleep 0.1
done done
fi fi
debug "$IPTABLES -I PREROUTING -d $SOURCE_IP -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j DNAT --to $TARGET_IP:$TARGET_PORT" debug "$IPTABLES -I PREROUTING -d $SOURCE_IP -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment $COMMENT -j DNAT --to $TARGET_IP:$TARGET_PORT"
$IPTABLES -I PREROUTING -d $SOURCE_IP -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j DNAT --to $TARGET_IP:$TARGET_PORT $IPTABLES -I PREROUTING -d $SOURCE_IP -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j DNAT --to $TARGET_IP:$TARGET_PORT
$IPTABLES -C PREROUTING -d $SOURCE_IP -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j DNAT --to $TARGET_IP:$TARGET_PORT
if [[ "$(echo $?)" != "0" ]]; then
$IPTABLES -w 20 -I PREROUTING -d $SOURCE_IP -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j DNAT --to $TARGET_IP:$TARGET_PORT
fi
} }
postrouting() { postrouting() {
@@ -191,7 +199,10 @@ postrouting() {
debug "$IPTABLES -I POSTROUTING -s $SOURCE_IP_FOR_POSTROUTING -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j MASQUERADE" debug "$IPTABLES -I POSTROUTING -s $SOURCE_IP_FOR_POSTROUTING -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j MASQUERADE"
$IPTABLES -I POSTROUTING -d $SOURCE_IP_FOR_POSTROUTING -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j MASQUERADE $IPTABLES -I POSTROUTING -d $SOURCE_IP_FOR_POSTROUTING -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j MASQUERADE
$IPTABLES -C POSTROUTING -d $SOURCE_IP_FOR_POSTROUTING -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j MASQUERADE
if [[ "$(echo $?)" != "0" ]]; then
$IPTABLES -w 20 -I POSTROUTING -d $SOURCE_IP_FOR_POSTROUTING -p $PROTOCOL --dport $SOURCE_PORT -m comment --comment "$COMMENT" -j MASQUERADE
fi
fi fi
if [ -n "$TARGET_IP" ] ; then if [ -n "$TARGET_IP" ] ; then
@@ -208,6 +219,10 @@ postrouting() {
fi fi
debug "$IPTABLES -I POSTROUTING -s $TARGET_IP_FOR_POSTROUTING -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j MASQUERADE" debug "$IPTABLES -I POSTROUTING -s $TARGET_IP_FOR_POSTROUTING -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j MASQUERADE"
$IPTABLES -I POSTROUTING -d $TARGET_IP_FOR_POSTROUTING -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j MASQUERADE $IPTABLES -I POSTROUTING -d $TARGET_IP_FOR_POSTROUTING -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j MASQUERADE
$IPTABLES -C POSTROUTING -d $TARGET_IP_FOR_POSTROUTING -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j MASQUERADE
if [[ "$(echo $?)" != "0" ]]; then
$IPTABLES -w 20 -I POSTROUTING -d $TARGET_IP_FOR_POSTROUTING -p $PROTOCOL --dport $TARGET_PORT -m comment --comment "$COMMENT" -j MASQUERADE
fi
fi fi
} }
@@ -238,7 +253,7 @@ echo 1 > /proc/sys/net/ipv4/ip_forward
############################## ##############################
IPTABLES=/sbin/iptables IPTABLES="/sbin/iptables"
############################### ###############################
@@ -297,7 +312,7 @@ else
############################ ############################
# Host firewall settings ### # Host firewall settings ###
if $IPTABLES --list $CHAIN |grep ESTABLISHED |grep RELATED|grep ACCEPT ; then if $IPTABLES -w 10 --list $CHAIN |grep ESTABLISHED |grep RELATED|grep ACCEPT ; then
echo "nothing to do"; echo "nothing to do";
else else
$IPTABLES -I $CHAIN -m state --state established,related -j ACCEPT; $IPTABLES -I $CHAIN -m state --state established,related -j ACCEPT;
@@ -329,14 +344,14 @@ else
# #
# DELETE UNECESSARY LINES FROM PREVIOUS RULES # DELETE UNECESSARY LINES FROM PREVIOUS RULES
IPTABLES_COMMAND="$IPTABLES --line-number -n --list $CHAIN | grep $PROTOCOL $GREP_OPTIONS | awk '{print \$1}'| tac"; IPTABLES_COMMAND="$IPTABLES -w 10 --line-number -n --list $CHAIN | grep $PROTOCOL $GREP_OPTIONS | awk '{print \$1}'| tac";
debug "$IPTABLES_COMMAND"; debug "$IPTABLES_COMMAND";
LINES=$(eval $IPTABLES_COMMAND); LINES=$(eval $IPTABLES_COMMAND);
if [ -n "$LINES" ] ; then if [ -n "$LINES" ] ; then
for i in $LINES; do for i in $LINES; do
debug "$IPTABLES -D $CHAIN $i" debug "$IPTABLES -D $CHAIN $i"
$IPTABLES -D $CHAIN $i $IPTABLES -w 10 -D $CHAIN $i
sleep 0.1 sleep 0.1
done done
fi fi
@@ -344,7 +359,10 @@ else
debug "$IPTABLES -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT" debug "$IPTABLES -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT"
$IPTABLES -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT $IPTABLES -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT
$IPTABLES -C $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT
if [[ "$(echo $?)" != "0" ]]; then
$IPTABLES -I $CHAIN -p $PROTOCOL $IPTABLES_OPTIONS -m comment --comment "$COMMENT" -j ACCEPT
fi
fi fi
############################# #############################
fi fi