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#!/bin/sh
#
# Copyright (C) 2014-2017 Jian Chang <aa65535@live.com>
#
# This is free software, licensed under the GNU General Public License v3.
# See /LICENSE for more information.
#
usage() {
cat <<-EOF
Usage: ss-rules [options]
Valid options are:
-s <server_ips> ip address of shadowsocks remote server
-l <local_port> port number of shadowsocks local server
-S <server_ips> ip address of shadowsocks remote UDP server
-L <local_port> port number of shadowsocks local UDP server
-B <ip_list_file> a file whose content is bypassed ip list
-b <wan_ips> wan ip of will be bypassed
-W <ip_list_file> a file whose content is forwarded ip list
-w <wan_ips> wan ip of will be forwarded
-I <interface> proxy only for the given interface
-d <target> the default target of lan access control
-a <lan_hosts> lan ip of access control, need a prefix to
define proxy type
-e <extra_args> extra arguments for iptables
-o apply the rules to the OUTPUT chain
-O apply the global rules to the OUTPUT chain
-u enable udprelay mode, TPROXY is required
-U enable udprelay mode, using different IP
and ports for TCP and UDP
-f flush the rules
-h show this help message and exit
EOF
exit $1
}
loger() {
# 1.alert 2.crit 3.err 4.warn 5.notice 6.info 7.debug
logger -st ss-rules[$$] -p$1 $2
}
flush_rules() {
iptables-save -c | grep -v "SS_SPEC" | iptables-restore -c
if command -v ip >/dev/null 2>&1; then
ip rule del fwmark 1 lookup 100 2>/dev/null
ip route del local default dev lo table 100 2>/dev/null
fi
for setname in $(ipset -n list | grep "ss_spec"); do
ipset destroy $setname 2>/dev/null
done
FWI=$(uci get firewall.shadowsocks.path 2>/dev/null)
[ -n "$FWI" ] && echo '# firewall include file' >$FWI
return 0
}
ipset_init() {
ipset -! restore <<-EOF || return 1
create ss_spec_src_ac hash:ip hashsize 64
create ss_spec_src_bp hash:ip hashsize 64
create ss_spec_src_fw hash:ip hashsize 64
create ss_spec_dst_sp hash:net hashsize 64
create ss_spec_dst_bp hash:net hashsize 64
create ss_spec_dst_fw hash:net hashsize 64
$(gen_lan_host_ipset_entry)
$(gen_special_purpose_ip | sed -e "s/^/add ss_spec_dst_sp /")
$(sed -e "s/^/add ss_spec_dst_bp /" ${WAN_BP_LIST:=/dev/null} 2>/dev/null)
$(for ip in $WAN_BP_IP; do echo "add ss_spec_dst_bp $ip"; done)
$(sed -e "s/^/add ss_spec_dst_fw /" ${WAN_FW_LIST:=/dev/null} 2>/dev/null)
$(for ip in $WAN_FW_IP; do echo "add ss_spec_dst_fw $ip"; done)
EOF
return 0
}
ipt_nat() {
include_ac_rules nat
ipt="iptables -t nat"
$ipt -A SS_SPEC_WAN_FW -p tcp \
-j REDIRECT --to-ports $local_port || return 1
if [ -n "$OUTPUT" ]; then
$ipt -N SS_SPEC_WAN_DG
$ipt -A SS_SPEC_WAN_DG -m set --match-set ss_spec_dst_sp dst -j RETURN
$ipt -A SS_SPEC_WAN_DG -p tcp $EXT_ARGS -j $OUTPUT
$ipt -I OUTPUT 1 -p tcp -j SS_SPEC_WAN_DG
fi
return $?
}
ipt_mangle() {
[ -n "$TPROXY" ] || return 0
if !(lsmod | grep -q TPROXY && command -v ip >/dev/null); then
loger 4 "TPROXY or ip not found."
return 0
fi
ip rule add fwmark 1 lookup 100
ip route add local default dev lo table 100
include_ac_rules mangle
iptables -t mangle -A SS_SPEC_WAN_FW -p udp \
-j TPROXY --on-port $LOCAL_PORT --tproxy-mark 0x01/0x01
return $?
}
export_ipt_rules() {
[ -n "$FWI" ] || return 0
cat <<-CAT >>$FWI
iptables-save -c | grep -v "SS_SPEC" | iptables-restore -c
iptables-restore -n <<-EOF
$(iptables-save | grep -E "SS_SPEC|^\*|^COMMIT" |\
sed -e "s/^-A \(OUTPUT\|PREROUTING\)/-I \1 1/")
EOF
CAT
return $?
}
gen_lan_host_ipset_entry() {
for host in $LAN_HOSTS; do
case "${host:0:1}" in
b|B)
echo add ss_spec_src_bp ${host:2}
;;
g|G)
echo add ss_spec_src_fw ${host:2}
;;
n|N)
echo add ss_spec_src_ac ${host:2}
;;
esac
done
}
gen_special_purpose_ip() {
cat <<-EOF | grep -E "^([0-9]{1,3}\.){3}[0-9]{1,3}"
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
192.31.196.0/24
192.52.193.0/24
192.88.99.0/24
192.168.0.0/16
192.175.48.0/24
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
$server
$SERVER
EOF
}
include_ac_rules() {
local protocol=$([ "$1" = "mangle" ] && echo udp || echo tcp)
iptables-restore -n <<-EOF
*$1
:SS_SPEC_LAN_DG - [0:0]
:SS_SPEC_LAN_AC - [0:0]
:SS_SPEC_WAN_AC - [0:0]
:SS_SPEC_WAN_FW - [0:0]
-A SS_SPEC_LAN_DG -m set --match-set ss_spec_dst_sp dst -j RETURN
-A SS_SPEC_LAN_DG -p $protocol $EXT_ARGS -j SS_SPEC_LAN_AC
-A SS_SPEC_LAN_AC -m set --match-set ss_spec_src_bp src -j RETURN
-A SS_SPEC_LAN_AC -m set --match-set ss_spec_src_fw src -j SS_SPEC_WAN_FW
-A SS_SPEC_LAN_AC -m set --match-set ss_spec_src_ac src -j SS_SPEC_WAN_AC
-A SS_SPEC_LAN_AC -j ${LAN_TARGET:=SS_SPEC_WAN_AC}
-A SS_SPEC_WAN_AC -m set --match-set ss_spec_dst_fw dst -j SS_SPEC_WAN_FW
-A SS_SPEC_WAN_AC -m set --match-set ss_spec_dst_bp dst -j RETURN
-A SS_SPEC_WAN_AC -j SS_SPEC_WAN_FW
$(gen_prerouting_rules $protocol)
COMMIT
EOF
}
gen_prerouting_rules() {
[ -z "$IFNAMES" ] && echo -I PREROUTING 1 -p $1 -j SS_SPEC_LAN_DG
for ifname in $IFNAMES; do
echo -I PREROUTING 1 -i $ifname -p $1 -j SS_SPEC_LAN_DG
done
}
while getopts ":s:l:S:L:B:b:W:w:I:d:a:e:oOuUfh" arg; do
case "$arg" in
s)
server=$(for ip in $OPTARG; do echo $ip; done)
;;
l)
local_port=$OPTARG
;;
S)
SERVER=$(for ip in $OPTARG; do echo $ip; done)
;;
L)
LOCAL_PORT=$OPTARG
;;
B)
WAN_BP_LIST=$OPTARG
;;
b)
WAN_BP_IP=$OPTARG
;;
W)
WAN_FW_LIST=$OPTARG
;;
w)
WAN_FW_IP=$OPTARG
;;
I)
IFNAMES=$OPTARG
;;
d)
LAN_TARGET=$OPTARG
;;
a)
LAN_HOSTS=$OPTARG
;;
e)
EXT_ARGS=$OPTARG
;;
o)
OUTPUT=SS_SPEC_WAN_AC
;;
O)
OUTPUT=SS_SPEC_WAN_FW
;;
u)
TPROXY=1
;;
U)
TPROXY=2
;;
f)
flush_rules
exit 0
;;
h)
usage 0
;;
esac
done
[ -z "$server" -o -z "$local_port" ] && usage 2
if [ "$TPROXY" = 1 ]; then
unset SERVER
LOCAL_PORT=$local_port
elif [ "$TPROXY" = 2 ]; then
: ${SERVER:?"You must assign an ip for the udp relay server."}
: ${LOCAL_PORT:?"You must assign a port for the udp relay server."}
fi
flush_rules && ipset_init && ipt_nat && ipt_mangle && export_ipt_rules
RET=$?
[ "$RET" = 0 ] || loger 3 "Start failed!"
exit $RET
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