update rip

linux/rip

@@ -1,13 +1,39 @@
 #!/bin/bash
 
-chan=pride
+chan=$1
 chan_pre=$chan'_pre'
 chan_forward=$chan'_forward'
 chan_post=$chan'_post'
-to=192.168.122.245
-to_port=3389
-from=10.69.115.207
-from_port=19520
+from=$2
+from_port=$3
+to=$4
+to_port=$5
+
+if ! [ -e "$1" ]; then
+  echo "iptable chan not found" >&1
+  exit 1
+fi
+
+if ! [ -e "$2" ]; then
+  echo "from host not found" >&1
+  exit 1
+fi
+if ! [ -e "$3" ]; then
+  echo "from port not found" >&1
+  exit 1
+fi
+
+if ! [ -e "$4" ]; then
+  echo "destination host not found" >&1
+  exit 1
+fi
+
+if ! [ -e "$5" ]; then
+  echo "destination port not found" >&1
+  exit 1
+fi
+
+echo "redirect ${from}:${from_port} to ${to}:${to_port}"
 
 ## 清空 引用
 sudo iptables -t nat  -nvL PREROUTING --line-number | awk -F ' ' 'BEGIN{c=0} /'${chan_pre}'/ {printf "%s %s %s\n",c, $1,$4;system("sudo iptables -t nat -D PREROUTING "$1-c);c++}'