71 lines
1.7 KiB
PHP
71 lines
1.7 KiB
PHP
remove_old()
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{
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# remove the rules from PREROUTING
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$IPT -t nat -F $CHAIN_FORWARD_CHECK 2>/dev/null && $IPT -t nat -D PREROUTING -i $IF_SRC -j $CHAIN_FORWARD_CHECK
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$IPT -t nat -F $CHAIN_REDIRECT 2>/dev/null && $IPT -t nat -D PREROUTING -i $IF_SRC -j $CHAIN_REDIRECT
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# empty and remove chains if they exist
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for a in $CHAIN_FORWARD_ACTION $CHAIN_FORWARD_CHECK $CHAIN_REDIRECT
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do $IPT -t nat -F $a 2>/dev/null && $IPT -t nat -X $a
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true
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done
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}
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init_chains()
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{
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# create chains
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for a in $CHAIN_FORWARD_ACTION $CHAIN_FORWARD_CHECK $CHAIN_REDIRECT
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do $IPT -t nat -N $a
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done
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# all packets from the specified interface go to the general chain
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$IPT -t nat -A PREROUTING -i $IF_SRC -j $CHAIN_FORWARD_CHECK
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$IPT -t nat -A PREROUTING -i $IF_SRC -j $CHAIN_REDIRECT
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# rules for CHAIN_REDIRECT
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$IPT -t nat -A $CHAIN_REDIRECT -p tcp --dport 80 -j DNAT --to-destination $SPLASH_SERVER
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$IPT -t nat -A $CHAIN_REDIRECT -p tcp --dport 80 -j ACCEPT
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$IPT -t nat -A $CHAIN_REDIRECT -j $REJECT_ACTION
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# all registered senders are simply accepted
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$IPT -t nat -A $CHAIN_FORWARD_ACTION -j ACCEPT
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}
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get_IPs()
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# prints out all active forwards line by line
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# every line consists of: "Number of Packets" and "IP"
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{
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iptables -t nat -L "$CHAIN_FORWARD_CHECK" -vnx | sed "1,2d; s/ */ /g" | cut -d " " -f 2,9
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# get all active forward chains
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# remove the first two lines
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# remove multiple spaces
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# take only the number of packets and the IP
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}
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register_IP()
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# add a new allowed IP
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{
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eval `echo "$RULE_ADD" | sed "s/_IP_/$1/g"`
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}
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unregister_IP()
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# remove the specified IP
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{
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eval `echo "$RULE_DEL" | sed "s/_IP_/$1/g"`
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}
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refresh_IP_list()
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{
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local NUM
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local IP
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get_IPs | while read NUM IP
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do [ "$NUM" = "0" ] && unregister_IP "$IP"
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done
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}
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