Update Docker

Dockerfile

@@ -3,16 +3,30 @@ FROM golang:alpine as builder
 WORKDIR /tun2socks-src
 COPY . /tun2socks-src
 
-RUN apk add --no-cache \
-        git \
-		make \
-		gcc \
-		musl-dev \
+RUN apk add --update --no-cache \
+    gcc git make musl-dev \
     && go mod download \
     && make build \
     && mv ./bin/tun2socks /tun2socks
 
 FROM alpine:latest
 
-COPY --from=builder /tun2socks /
-ENTRYPOINT ["/tun2socks"]
+COPY ./tun2socks.sh /
+COPY --from=builder /tun2socks /usr/local/bin
+
+RUN apk add --update --no-cache \
+    curl lsof iptables iproute2 bind-tools \
+    && chmod +x /tun2socks.sh
+
+ENV TUN tun0
+ENV ETH eth0
+ENV ETHGW 172.16.1.1
+ENV TUNGW 240.0.0.1
+ENV PROXY 172.16.1.2:1080
+ENV MONITOR 0.0.0.0:80
+ENV EXCLUDED 172.16.1.2/32
+ENV LOGLEVEL warning
+ENV BACKENDDNS 8.8.8.8:53
+ENV HOSTS localhost=127.0.0.1
+
+ENTRYPOINT ["/tun2socks.sh"]

tun2socks.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+TUN="${TUN:-utun0}"
+ETH="${ETH:-eth0}"
+ETHGW="${ETHGW:-172.16.1.1}"
+TUNGW="${TUNGW:-240.0.0.1}"
+PROXY="${PROXY:-172.16.1.2:1080}"
+MONITOR="${MONITOR:-0.0.0.0:80}"
+EXCLUDED="${EXCLUDED:-172.16.1.2/32}"
+LOGLEVEL="${LOGLEVEL:-warning}"
+BACKENDDNS="${BACKENDDNS:-8.8.8.8:53}"
+HOSTS="${HOSTS:-localhost=127.0.0.1}"
+
+# enable ip_forward
+sysctl -w net.ipv4.ip_forward=1 &> /dev/null
+
+# create tun device
+ip tuntap add mode tun dev $TUN
+ip addr add $TUNGW/24 dev $TUN
+ip link set dev $TUN up
+echo "tun device created: $TUN"
+
+# change default gateway
+ip route del default &> /dev/null
+ip route add default via $TUNGW dev $TUN
+
+# add to ip route
+for ip in $(echo $EXCLUDED | tr ',' '\n')
+do
+    ip route add $ip via $ETHGW
+done
+
+# DNS settings
+echo "nameserver $TUNGW" > /etc/resolv.conf
+echo "DNS settings updated"
+
+tun2socks -loglevel $LOGLEVEL \
+    -tunName $TUN -proxyServer $PROXY \
+    -monitor -monitorAddr $MONITOR \
+    -fakeDNS -hosts $HOSTS \
+    -backendDNS $BACKENDDNS