Hybrid app testing using dynamic DNS (http://codeforhire.com/2014/03/23/hybrid-app-testing-using-dynamic-dns/)

noip

#!/bin/bash
set -e

#############################  CONFIGURATION  #############################


# Dynamic DNS user
USERNAME="user"

# Dynamic DNS password
PASSWORD="secret"

# Dynamic DNS update URL (default uses no-ip.com)
UPDATE_URL="https://${USERNAME}:${PASSWORD}@dynupdate.no-ip.com/nic/update"

# Regex for preferred local IP address (in case multiple are found)
PREFERRED_IP="^192.168"

# Default domain for device names ("android" -> "android.no-ip.biz")
DEFAULT_DEV_DOMAIN="no-ip.biz"

# Default domain for environment names ("dev" -> "dev.example.com")
DEFAULT_ENV_DOMAIN="example.com"


###########################################################################


DEVICE="$1"
IP="$2"

if [ -z "$DEVICE" ]; then
    echo "Usage:  noip <device name|hostname> [environment name|ip-address|hostname]"
    echo "Examples:"
    echo "   noip android             -> point android.${DEFAULT_DEV_DOMAIN} to your local IP"
    echo "   noip android dev         -> point android.${DEFAULT_DEV_DOMAIN} to dev.${DEFAULT_ENV_DOMAIN}"
    echo "   noip android google.com  -> point android.${DEFAULT_DEV_DOMAIN} to google.com"
    echo "   noip android 1.2.3.4     -> point android.${DEFAULT_DEV_DOMAIN} to 1.2.3.4"
    exit 1
fi

# Convert device name into host name
if echo "$DEVICE" | grep -vq '\.'; then
    DEVICE="${DEVICE}.${DEFAULT_DEV_DOMAIN}"
fi

# Convert environment name into host name
if echo "$IP" | grep -q '^[^.][^.]*$' ; then
    IP="${IP}.${DEFAULT_ENV_DOMAIN}"
fi

# Convert environment host name into IP address
if echo "$IP" | grep -q "[A-Za-z]" ; then
    IPADDR="$(dig +short "$IP")"
    if [ -z "$IPADDR" ]; then
	echo "Could not resolve host name $IP"
	exit 1
    fi
    IP="$IPADDR"
fi

# Use local IP address if none provided
if [ -z "$IP" ]; then
    # Following works with both Linux and Mac style of ifconfig output
    IPS="$(ifconfig | grep "inet " | grep -v '[: ]127\.0\.' | perl -pe 's/^.*?([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+).*$/$1/' | tr '\n' ' ')"
    COUNT=0
    PREFERRED=0
    for i in $IPS; do
	[ -z "$IP" ] && IP="$i"
	if echo "$i" | grep -q "$PREFERRED_IP"; then
	    IP="$i"
	    PREFERRED=$(($PREFERRED+1))
	fi
	COUNT=$(($COUNT+1))
    done
    case $COUNT in
	0)
	    echo "No local IP address was found"
	    exit 1 ;;
	1)  ;;
	*)
	    case $PREFERRED in
		0)
		    echo "WARNING: Multiple IP addresses found with none preferred: $IPS"
		    echo "         Selecting arbitrarily IP address $IP" ;;
		1)  ;;
		*)
		    echo "WARNING: Multiple preferred IP addresses found in $IPS"
		    echo "         Selecting arbitrarily IP address $IP" ;;
	    esac ;;
    esac
    echo "Using local IP address $IP"
fi

# Check IP address validity
if ! echo "$IP" | grep -q '^[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$'; then
    echo "Invalid IP address $IP"
    exit 1
fi

# Perform update
echo "Setting host $DEVICE to IP address $IP"
RESULT="$(curl -s "${UPDATE_URL}?hostname=${DEVICE}&myip=${IP}")"
echo "$RESULT"
if ! echo "$RESULT" | grep -q "good\|nochg"; then
    echo "Error setting IP address"
    exit 1
fi

# Wait until DNS has been updated
COUNT=0
NEWIP="xxx"
while [ "$NEWIP" != "$IP" ]; do
    sleep 1
    NEWIP="$(dig +short "$DEVICE")"
    COUNT=$(($COUNT+1))
    echo -ne "Waiting for DNS update... (${COUNT}s  ip=$NEWIP)          \r"
done
echo