[init] tunnel script

:Release Notes:
usage: tun.sh <args>
args:
-p|--port <port> - specify one port to which we should listen and forward (will
be added to the .tunLast file for future use)
-k|--kill - to kill all opened ports
-d|--debug - output result opened ports (ssh grep)

:Detailed Notes:
-

:Testing Performed:
-

:QA Notes:
-

:Issues Addressed:
-

.tunLast

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+2222

tun.sh

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+#!/bin/bash
+scriptName=$(basename $0)
+version=0.1
+idx=0
+killFlag=0
+endpoint="192.168.105.100"
+user="vptyp"
+cacheFile=.tunLast
+privateKeyLoc="~/.ssh/id_ecdsa"
+override=0
+debug=0
+
+
+fromPort=0
+toPort=0
+function killTunnel {
+	if [[ debug -eq 1 ]]; then 
+		printf "killTunnel %d\n" $toPort
+	fi
+	pkill -f "ssh -i ${privateKeyLoc} -fNL 0.0.0.0:$toPort:"
+	iptables -D INPUT -p tcp --dport $toPort -j ACCEPT 2>/dev/null
+}
+
+function openTunnel {
+	ssh -i ${privateKeyLoc} -fNL 0.0.0.0:$toPort:${endpoint}:$fromPort ${user}@localhost
+	iptables -A INPUT -p tcp --dport $toPort -j ACCEPT 2>/dev/null
+}
+
+function parsePort {
+	local delimiter=":"
+	str=$1
+	fromPort=${str%%${delimiter}*}
+	toPort=${str#*${delimiter}}
+	if [[ ${#toPort} -eq 0 ]]; then
+		toPort=$fromPort
+	fi
+}
+
+function usage {
+	echo "
+	Usage: $scriptName [OPTIONS]
+	Options: 
+	  -k | --kill		Try to kill defined tunnels, if missing will try to create them
+	  -p | --port FROM:TO	Define new port forwarding rule, if in format FROM:TO - will create
+	  			tunnel from port FROM on defined endpoint to port TO on local
+	"
+}
+
+while [[ "$1" =~ ^- && ! "$1" == "--" ]]; do case $1 in
+  -V | --version )
+    echo "$version"
+    exit
+    ;;
+  -k | --kill )
+    killFlag=1
+    ;;
+  -p | --port )
+    shift;
+    port[$idx]=$1
+    idx=$(($idx+1))
+    override=1
+    ;;
+  -d | --debug )
+    debug=1
+    ;;
+  -h | --help )
+    usage
+    exit
+    ;;
+esac; shift; done
+if [[ "$1" == '--' ]]; then shift; fi
+
+if [[ ${#port[@]} -gt 0 ]]; then
+	printf "PORT TO OPEN: %s\n" ${port[@]}
+fi
+
+if [[ ${override} -eq 0 && -r ${cacheFile} ]]; then
+	while IFS= read -r line; do
+    	port[$idx]=$line
+	idx=$(($idx+1))
+	done < ${cacheFile}
+fi
+
+for i in "${port[@]}"; do
+	parsePort $i
+	if [[ ${killFlag} -eq 1 ]]; then
+		killTunnel 
+	else
+		openTunnel 
+	fi
+done
+
+printf "%s\\n" "${port[@]}" > ${cacheFile}
+
+if [[ ${debug} -eq 1 ]]; then
+	netstat -lnptu | grep ssh
+fi