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#!/bin/sh
usage() {
cat <<-EOF
Usage: ss-rules [options]
Valid options are:
-s <server_host> hostname or ip of shadowsocks remote server
-l <local_port> port number of shadowsocks local server
-i <ip_list_file> a file content is bypassed ip list
-a <lan_ips> lan ip of access control, need a prefix to
define access control mode
-b <wan_ips> wan ip of will be bypassed
-w <wan_ips> wan ip of will be forwarded
-e <extra_options> extra options for iptables
-o apply the rules to the OUTPUT chain
-u enable udprelay mode, TPROXY is required
-f flush the rules
EOF
}
loger() {
# 1.alert 2.crit 3.err 4.warn 5.notice 6.info 7.debug
logger -st ss-rules[$$] -p$1 $2
}
ipt_n="iptables -t nat"
ipt_m="iptables -t mangle"
flush_r() {
local IPT
IPT=$(iptables-save -t nat)
eval $(echo "$IPT" | grep "_SS_SPEC_RULE_" | \
sed -e 's/^-A/$ipt_n -D/' -e 's/$/;/')
for chain in $(echo "$IPT" | awk '/^:SS_SPEC/{print $1}'); do
$ipt_n -F ${chain:1} 2>/dev/null && $ipt_n -X ${chain:1}
done
IPT=$(iptables-save -t mangle)
eval $(echo "$IPT" | grep "_SS_SPEC_RULE_" | \
sed -e 's/^-A/$ipt_m -D/' -e 's/$/;/')
for chain in $(echo "$IPT" | awk '/^:SS_SPEC/{print $1}'); do
$ipt_m -F ${chain:1} 2>/dev/null && $ipt_m -X ${chain:1}
done
ip rule del fwmark 0x01/0x01 table 100 2>/dev/null
ip route del local 0.0.0.0/0 dev lo table 100 2>/dev/null
ipset -X ss_spec_lan_ac 2>/dev/null
ipset -X ss_spec_wan_ac 2>/dev/null
return 0
}
ipset_r() {
ipset -! -R <<-EOF || return 1
create ss_spec_wan_ac hash:net
$(echo -e "$IPLIST" | sed -e "s/^/add ss_spec_wan_ac /")
$(for ip in $WAN_FW_IP; do echo "add ss_spec_wan_ac $ip nomatch"; done)
EOF
$ipt_n -N SS_SPEC_WAN_AC && \
$ipt_n -A SS_SPEC_WAN_AC -m set --match-set ss_spec_wan_ac dst -j RETURN && \
$ipt_n -A SS_SPEC_WAN_AC -j SS_SPEC_WAN_FW
return $?
}
fw_rule() {
$ipt_n -N SS_SPEC_WAN_FW && \
$ipt_n -A SS_SPEC_WAN_FW -p tcp \
-j REDIRECT --to-ports $LOCAL_PORT 2>/dev/null || {
loger 3 "Can't redirect, please check the iptables."
exit 1
}
return $?
}
ac_rule() {
local TAG ROUTECHAIN
if [ -n "$LAN_AC_IP" ]; then
if [ "${LAN_AC_IP:0:1}" = "w" ]; then
TAG="nomatch"
else
if [ "${LAN_AC_IP:0:1}" != "b" ]; then
loger 3 "Bad argument \`-a $LAN_AC_IP\`."
return 2
fi
fi
fi
ROUTECHAIN=PREROUTING
if iptables-save -t nat | grep -q "^:zone_lan_prerouting"; then
ROUTECHAIN=zone_lan_prerouting
fi
ipset -! -R <<-EOF || return 1
create ss_spec_lan_ac hash:net
$(for ip in ${LAN_AC_IP:1}; do echo "add ss_spec_lan_ac $ip $TAG"; done)
EOF
$ipt_n -A $ROUTECHAIN -p tcp $EXT_ARGS \
-m set ! --match-set ss_spec_lan_ac src \
-m comment --comment "_SS_SPEC_RULE_" -j SS_SPEC_WAN_AC
if [ "$OUTPUT" = 1 ]; then
$ipt_n -A OUTPUT -p tcp $EXT_ARGS \
-m comment --comment "_SS_SPEC_RULE_" -j SS_SPEC_WAN_AC
fi
return $?
}
tp_rule() {
[ "$TPROXY" = 1 ] || return 0
ip rule add fwmark 0x01/0x01 table 100
ip route add local 0.0.0.0/0 dev lo table 100
$ipt_m -N SS_SPEC_TPROXY
$ipt_m -A SS_SPEC_TPROXY -p udp -m set ! --match-set ss_spec_wan_ac dst \
-j TPROXY --on-port $LOCAL_PORT --tproxy-mark 0x01/0x01
$ipt_m -A PREROUTING -p udp $EXT_ARGS \
-m set ! --match-set ss_spec_lan_ac src \
-m comment --comment "_SS_SPEC_RULE_" -j SS_SPEC_TPROXY
return $?
}
while getopts ":s:l:c:i:e:a:b:w:ouf" arg; do
case $arg in
s)
SERVER=$OPTARG
;;
l)
LOCAL_PORT=$OPTARG
;;
i)
IGNORE=$OPTARG
;;
e)
EXT_ARGS=$OPTARG
;;
a)
LAN_AC_IP=$OPTARG
;;
b)
WAN_BP_IP=$(for ip in $OPTARG; do echo $ip; done)
;;
w)
WAN_FW_IP=$OPTARG
;;
o)
OUTPUT=1
;;
u)
TPROXY=1
;;
f)
flush_r
exit 0
;;
esac
done
if [ -z "$SERVER" -o -z "$LOCAL_PORT" ]; then
usage
exit 2
fi
SERVER=$(resolveip -t60 $SERVER)
if [ -z "$SERVER" ]; then
loger 3 "Can't resolve the server hostname."
exit 1
fi
if [ -f "$IGNORE" ]; then
IGNORE_IP=$(cat $IGNORE 2>/dev/null)
fi
IPLIST=$(cat <<-EOF | grep -E "^([0-9]{1,3}\.){3}[0-9]{1,3}"
$SERVER
0.0.0.0/8
10.0.0.0/8
100.64.0.0/10
127.0.0.0/8
169.254.0.0/16
172.16.0.0/12
192.0.0.0/24
192.0.2.0/24
192.88.99.0/24
192.168.0.0/16
198.18.0.0/15
198.51.100.0/24
203.0.113.0/24
224.0.0.0/4
240.0.0.0/4
255.255.255.255
$WAN_BP_IP
$IGNORE_IP
EOF
)
flush_r && fw_rule && ipset_r && ac_rule && tp_rule
exit $?