Simple script to extract the ever changing credentials from the website of the VPN provider VPNBook. Especially useful on OpenWRT based routers.

vpnbook

#!/bin/sh
# Extracts the user and password for the VPNBook free VPN service
# out of their web site

# URL to the site containing user and password
SITE="http://www.vpnbook.com/freevpn"
# File where VPNBook credentials get stored
AUTH_FILE="/etc/openvpn/vpnbook.auth"
# Path to temporary file
AUTH_FILE_TMP="/tmp/vpnbook.$$"

cleanup() {
	rm -f "$AUTH_FILE_TMP"
}

trap cleanup SIGHUP SIGINT SIGTERM

load_credentials() {
	wget "$SITE" -q -O - |\
	awk -F '[<>]' '
	BEGIN { exit_value = 1 }
	/Username:/ && !user_found { print $5; user_found = 1; next }
	/Password:/ && user_found { print $5; exit_value = 0; exit } 
	END { exit exit_value }
	'
}
if load_credentials > "$AUTH_FILE_TMP"; then
	mv "$AUTH_FILE_TMP" "$AUTH_FILE"
	exit 0
fi
exit 1