refactor: optimize init script

Dockerfile

@@ -1,6 +1,6 @@
 FROM alpine as asset
 COPY ./asset.sh /
-RUN apk --update add --no-cache curl wget jq && \
+RUN apk add curl wget jq && \
     sh /asset.sh
 
 FROM alpine

load.sh

@@ -184,14 +184,14 @@ EOF
 }
 
 load_bypass_ipv4() {
-cat>"$NETWORK_DIR/bypass/ipv4"<<EOF
+  cat > $NETWORK_DIR/bypass/ipv4 << EOF
 169.254.0.0/16
 224.0.0.0/3
 EOF
 }
 
 load_bypass_ipv6() {
-cat>"$NETWORK_DIR/bypass/ipv6"<<EOF
+  cat > $NETWORK_DIR/bypass/ipv6 << EOF
 fc00::/7
 fe80::/10
 ff00::/8
@@ -199,7 +199,7 @@ EOF
 }
 
 load_network_ipv4() {
-cat>"$NETWORK_DIR/interface/ipv4"<<EOF
+  cat > $NETWORK_DIR/interface/ipv4 << EOF
 ADDRESS=
 GATEWAY=
 FORWARD=true
@@ -207,7 +207,7 @@ EOF
 }
 
 load_network_ipv6() {
-cat>"$NETWORK_DIR/interface/ipv6"<<EOF
+  cat > $NETWORK_DIR/interface/ipv6 << EOF
 ADDRESS=
 GATEWAY=
 FORWARD=true

tproxy.sh

@@ -1,44 +1,75 @@
 #!/bin/sh
-trap "echo \"Get exit signal\" && exit" 2 15
-[ -f "/etc/xray/expose/custom.sh" ] && sh /etc/xray/expose/custom.sh
 
-# IPv4 tproxy settings
+exit_func() { # doing before exit
+  echo "[TProxy] Get exit signal."
+  kill -15 -1 # send SIGTERM to all process
+
+  while [ "$(ps -ef | grep -cv "PID\|ps -ef\|\[")" != "2" ] # remain itself and it's fork $(...)
+  do
+    usleep 10000 # wait 10ms
+  done
+
+  echo "[TProxy] All subprocess exit."
+  exit
+}
+
+ipv4_tproxy() { # IPv4 tproxy settings
   ip -4 rule add fwmark 1 table 100
   ip -4 route add local 0.0.0.0/0 dev lo table 100
   iptables -t mangle -N XRAY
 
   for cidr in $(ip -4 addr | grep -w "inet" | awk '{print $2}') # bypass local ipv4 range
   do
+    echo "[TProxy] IPv4 bypass $cidr"
     eval "iptables -t mangle -A XRAY -d $cidr -j RETURN"
   done
 
   while read -r cidr # bypass custom ipv4 range
   do
+    echo "[TProxy] IPv4 bypass $cidr"
     eval "iptables -t mangle -A XRAY -d $cidr -j RETURN"
   done < /etc/xray/expose/network/bypass/ipv4
 
   iptables -t mangle -A XRAY -p tcp -j TPROXY --on-port 7288 --tproxy-mark 1
   iptables -t mangle -A XRAY -p udp -j TPROXY --on-port 7288 --tproxy-mark 1
   iptables -t mangle -A PREROUTING -j XRAY
+}
 
-# IPv6 tproxy settings
+ipv6_tproxy() { # IPv6 tproxy settings
   ip -6 rule add fwmark 1 table 106
   ip -6 route add local ::/0 dev lo table 106
   ip6tables -t mangle -N XRAY6
 
   for cidr in $(ip -6 addr | grep -w "inet6" | awk '{print $2}') # bypass local ipv6 range
   do
+    echo "[TProxy] IPv6 bypass $cidr"
     eval "ip6tables -t mangle -A XRAY6 -d $cidr -j RETURN"
   done
 
   while read -r cidr # bypass custom ipv6 range
   do
+    echo "[TProxy] IPv6 bypass $cidr"
     eval "ip6tables -t mangle -A XRAY6 -d $cidr -j RETURN"
   done < /etc/xray/expose/network/bypass/ipv6
 
   ip6tables -t mangle -A XRAY6 -p tcp -j TPROXY --on-port 7289 --tproxy-mark 1
   ip6tables -t mangle -A XRAY6 -p udp -j TPROXY --on-port 7289 --tproxy-mark 1
   ip6tables -t mangle -A PREROUTING -j XRAY6
+}
 
+
+trap exit_func 2 15 # SIGINT and SIGTERM signal
+
+echo "[TProxy] Server start."
+echo "[TProxy] Init network environment."
+ipv4_tproxy
+ipv6_tproxy
 sh /etc/xray/load.sh
-xray -confdir /etc/xray/config/ # start xray server
+echo "[TProxy] Init complete."
+
+echo "[TProxy] Running custom script."
+custom_script="/etc/xray/expose/custom.sh"
+[ -f "$custom_script" ] && sh $custom_script
+
+echo "[TProxy] Start xray service."
+xray -confdir /etc/xray/config/