mirror of
https://github.com/springzfx/cgproxy.git
synced 2026-01-07 13:07:56 +08:00
235 lines
9.2 KiB
Bash
235 lines
9.2 KiB
Bash
#!/bin/bash
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print_help(){
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cat << 'DOC'
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#############################################################################
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#
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# 1. This script need cgroup v2
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#
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# 2. Listening port is expected to accept iptables TPROXY, while REDIRECT
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# will not work in this script, because REDIRECT only support tcp/ipv4
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#
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# 3. TPROXY need root or special capability whatever process is listening on port
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# v2ray as example:
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# sudo setcap "cap_net_bind_service=+ep cap_net_admin=+ep" /usr/lib/v2ray/v2ray
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#
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# 4. this script will proxy anything running in specific cgroup
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#
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# script usage:
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# cgroup-tproxy.sh [--help|--config|stop]
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# --config=FILE
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# load config from file
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# --help
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# show help info
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# stop
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# clean then stop
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#
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# proxy usage:
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# cgproxy <program>
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#
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#############################################################################
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DOC
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}
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## check root
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[ ! $(id -u) -eq 0 ] && { >&2 echo "iptables: need root to modify iptables";exit -1; }
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## any process in this cgroup will be proxied
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if [ -z ${cgroup_proxy+x} ]; then
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cgroup_proxy="/proxy.slice"
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else
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IFS=':' read -r -a cgroup_proxy <<< "$cgroup_proxy"
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fi
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## any process in this cgroup will not be proxied
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if [ -z ${cgroup_noproxy+x} ]; then
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cgroup_noproxy="/noproxy.slice"
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else
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IFS=':' read -r -a cgroup_noproxy <<< "$cgroup_noproxy"
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fi
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# allow as gateway for local network
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[ -z ${enable_gateway+x} ] && enable_gateway=false
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## some variables
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[ -z ${port+x} ] && port=12345
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## some options
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[ -z ${enable_dns+x} ] && enable_dns=true
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[ -z ${enable_tcp+x} ] && enable_tcp=true
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[ -z ${enable_udp+x} ] && enable_udp=true
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[ -z ${enable_ipv4+x} ] && enable_ipv4=true
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[ -z ${enable_ipv6+x} ] && enable_ipv6=true
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## do not modify this if you don't known what you are doing
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table=100
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fwmark=0x01
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make_newin=0x02
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## cgroup things
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cgroup_mount_point=$(findmnt -t cgroup2 -n -o TARGET)
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cgroup_type="cgroup2"
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cgroup_procs_file="cgroup.procs"
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stop(){
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iptables -t mangle -L TPROXY_PRE &> /dev/null || return
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echo "iptables: cleaning tproxy iptables"
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iptables -t mangle -D PREROUTING -j TPROXY_PRE
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iptables -t mangle -D OUTPUT -j TPROXY_OUT
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iptables -t mangle -F TPROXY_PRE
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iptables -t mangle -F TPROXY_OUT
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iptables -t mangle -F TPROXY_ENT
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iptables -t mangle -X TPROXY_PRE
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iptables -t mangle -X TPROXY_OUT
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iptables -t mangle -X TPROXY_ENT
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ip6tables -t mangle -D PREROUTING -j TPROXY_PRE
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ip6tables -t mangle -D OUTPUT -j TPROXY_OUT
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ip6tables -t mangle -F TPROXY_PRE
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ip6tables -t mangle -F TPROXY_OUT
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ip6tables -t mangle -F TPROXY_ENT
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ip6tables -t mangle -X TPROXY_PRE
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ip6tables -t mangle -X TPROXY_OUT
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ip6tables -t mangle -X TPROXY_ENT
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ip rule delete fwmark $fwmark lookup $table
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ip route flush table $table
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ip -6 rule delete fwmark $fwmark lookup $table
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ip -6 route flush table $table
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## may not exist, just ignore, and tracking their existence is not reliable
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iptables -t nat -D POSTROUTING -m owner ! --socket-exists -j MASQUERADE &> /dev/null
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ip6tables -t nat -D POSTROUTING -m owner ! --socket-exists -s fc00::/7 -j MASQUERADE &> /dev/null
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}
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## parse parameter
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for i in "$@"
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do
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case $i in
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stop)
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stop
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exit 0
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;;
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--config=*)
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config=${i#*=}
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source $config
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;;
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--help)
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print_help
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exit 0
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;;
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esac
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done
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## TODO cgroup need to exists before using in iptables since 5.6.5, maybe it's bug
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## only create the first one in arrary
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test -d $cgroup_mount_point$cgroup_proxy || mkdir $cgroup_mount_point$cgroup_proxy || exit -1;
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test -d $cgroup_mount_point$cgroup_noproxy || mkdir $cgroup_mount_point$cgroup_noproxy || exit -1;
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echo "iptables: applying tproxy iptables"
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## use TPROXY
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#ipv4#
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ip rule add fwmark $fwmark table $table
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ip route add local default dev lo table $table
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iptables -t mangle -N TPROXY_ENT
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iptables -t mangle -A TPROXY_ENT -p tcp -j TPROXY --on-ip localhost --on-port $port --tproxy-mark $fwmark
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iptables -t mangle -A TPROXY_ENT -p udp -j TPROXY --on-ip localhost --on-port $port --tproxy-mark $fwmark
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iptables -t mangle -N TPROXY_PRE
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iptables -t mangle -A TPROXY_PRE -m socket --transparent -j MARK --set-mark $fwmark
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iptables -t mangle -A TPROXY_PRE -m socket --transparent -j RETURN
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iptables -t mangle -A TPROXY_PRE -p icmp -j RETURN
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iptables -t mangle -A TPROXY_PRE -p udp --dport 53 -j TPROXY_ENT
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iptables -t mangle -A TPROXY_PRE -p tcp --dport 53 -j TPROXY_ENT
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iptables -t mangle -A TPROXY_PRE -m addrtype --dst-type LOCAL -j RETURN
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iptables -t mangle -A TPROXY_PRE -m addrtype ! --dst-type UNICAST -j RETURN
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iptables -t mangle -A TPROXY_PRE -j TPROXY_ENT
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iptables -t mangle -A PREROUTING -j TPROXY_PRE
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iptables -t mangle -N TPROXY_OUT
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iptables -t mangle -A TPROXY_OUT -p icmp -j RETURN
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iptables -t mangle -A TPROXY_OUT -m connmark --mark $make_newin -j RETURN
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iptables -t mangle -A TPROXY_OUT -m addrtype --dst-type LOCAL -j RETURN
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iptables -t mangle -A TPROXY_OUT -m addrtype ! --dst-type UNICAST -j RETURN
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for cg in ${cgroup_noproxy[@]}; do
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iptables -t mangle -A TPROXY_OUT -m cgroup --path $cg -j RETURN || { >&2 echo "iptables: $cg not exist, won't apply"; }
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done
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for cg in ${cgroup_proxy[@]}; do
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iptables -t mangle -A TPROXY_OUT -m cgroup --path $cg -j MARK --set-mark $fwmark || { >&2 echo "iptables: $cg not exist, won't apply"; }
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done
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iptables -t mangle -A OUTPUT -j TPROXY_OUT
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#ipv6#
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ip -6 rule add fwmark $fwmark table $table
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ip -6 route add local default dev lo table $table
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ip6tables -t mangle -N TPROXY_ENT
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ip6tables -t mangle -A TPROXY_ENT -p tcp -j TPROXY --on-ip localhost --on-port $port --tproxy-mark $fwmark
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ip6tables -t mangle -A TPROXY_ENT -p udp -j TPROXY --on-ip localhost --on-port $port --tproxy-mark $fwmark
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ip6tables -t mangle -N TPROXY_PRE
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ip6tables -t mangle -A TPROXY_PRE -m socket --transparent -j MARK --set-mark $fwmark
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ip6tables -t mangle -A TPROXY_PRE -m socket --transparent -j RETURN
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ip6tables -t mangle -A TPROXY_PRE -p icmpv6 -j RETURN
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ip6tables -t mangle -A TPROXY_PRE -p udp --dport 53 -j TPROXY_ENT
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ip6tables -t mangle -A TPROXY_PRE -p tcp --dport 53 -j TPROXY_ENT
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ip6tables -t mangle -A TPROXY_PRE -m addrtype --dst-type LOCAL -j RETURN
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ip6tables -t mangle -A TPROXY_PRE -m addrtype ! --dst-type UNICAST -j RETURN
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ip6tables -t mangle -A TPROXY_PRE -j TPROXY_ENT
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ip6tables -t mangle -A PREROUTING -j TPROXY_PRE
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ip6tables -t mangle -N TPROXY_OUT
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ip6tables -t mangle -A TPROXY_OUT -p icmpv6 -j RETURN
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ip6tables -t mangle -A TPROXY_OUT -m connmark --mark $make_newin -j RETURN
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ip6tables -t mangle -A TPROXY_OUT -m addrtype --dst-type LOCAL -j RETURN
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ip6tables -t mangle -A TPROXY_OUT -m addrtype ! --dst-type UNICAST -j RETURN
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for cg in ${cgroup_noproxy[@]}; do
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ip6tables -t mangle -A TPROXY_OUT -m cgroup --path $cg -j RETURN || { >&2 echo "iptables: $cg not exist, won't apply"; }
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done
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for cg in ${cgroup_proxy[@]}; do
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ip6tables -t mangle -A TPROXY_OUT -m cgroup --path $cg -j MARK --set-mark $fwmark || { >&2 echo "iptables: $cg not exist, won't apply"; }
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done
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ip6tables -t mangle -A OUTPUT -j TPROXY_OUT
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## allow to disable, order is important
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$enable_dns || iptables -t mangle -I TPROXY_OUT -p udp --dport 53 -j RETURN
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$enable_dns || ip6tables -t mangle -I TPROXY_OUT -p udp --dport 53 -j RETURN
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$enable_udp || iptables -t mangle -I TPROXY_OUT -p udp -j RETURN
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$enable_udp || ip6tables -t mangle -I TPROXY_OUT -p udp -j RETURN
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$enable_tcp || iptables -t mangle -I TPROXY_OUT -p tcp -j RETURN
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$enable_tcp || ip6tables -t mangle -I TPROXY_OUT -p tcp -j RETURN
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$enable_ipv4 || iptables -t mangle -I TPROXY_OUT -j RETURN
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$enable_ipv6 || ip6tables -t mangle -I TPROXY_OUT -j RETURN
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if $enable_gateway; then
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$enable_dns || iptables -t mangle -I TPROXY_PRE -p udp --dport 53 -j RETURN
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$enable_dns || ip6tables -t mangle -I TPROXY_PRE -p udp --dport 53 -j RETURN
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$enable_udp || iptables -t mangle -I TPROXY_PRE -p udp -j RETURN
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$enable_udp || ip6tables -t mangle -I TPROXY_PRE -p udp -j RETURN
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$enable_tcp || iptables -t mangle -I TPROXY_PRE -p tcp -j RETURN
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$enable_tcp || ip6tables -t mangle -I TPROXY_PRE -p tcp -j RETURN
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$enable_ipv4 || iptables -t mangle -I TPROXY_PRE -j RETURN
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$enable_ipv6 || ip6tables -t mangle -I TPROXY_PRE -j RETURN
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fi
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## do not handle local device connection through tproxy if gateway is not enabled
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$enable_gateway || iptables -t mangle -I TPROXY_PRE -m addrtype ! --src-type LOCAL -j RETURN
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$enable_gateway || ip6tables -t mangle -I TPROXY_PRE -m addrtype ! --src-type LOCAL -j RETURN
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## make sure following rules are the first in chain TPROXY_PRE to mark new incoming connection or gateway proxy connection
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## so must put at last to insert first
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iptables -t mangle -I TPROXY_PRE -m addrtype ! --src-type LOCAL -m conntrack --ctstate NEW -j CONNMARK --set-mark $make_newin
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ip6tables -t mangle -I TPROXY_PRE -m addrtype ! --src-type LOCAL -m conntrack --ctstate NEW -j CONNMARK --set-mark $make_newin
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## message for user
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cat << DOC
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iptables: noproxy cgroup: ${cgroup_noproxy[@]}
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iptables: proxied cgroup: ${cgroup_proxy[@]}
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DOC
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if $enable_gateway; then
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iptables -t nat -A POSTROUTING -m owner ! --socket-exists -j MASQUERADE
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ip6tables -t nat -A POSTROUTING -m owner ! --socket-exists -s fc00::/7 -j MASQUERADE # only masquerade ipv6 private address
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sysctl -w net.ipv4.ip_forward=1
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sysctl -w net.ipv6.conf.all.forwarding=1
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echo "ipatbles: gateway enabled"
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fi
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