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#!/bin/sh

if [ "$ACTION" = ifup ]; then
	. /etc/functions.sh

	include /lib/network
	scan_interfaces

	update_tunnel() {
		local cfg="$1"

		local proto
		config_get proto "$cfg" proto
		[ "$proto" = 6in4 ] || return 0

		local wandev
		config_get wandev "$cfg" wan_device "$(find_6in4_wanif)"
		[ "$wandev" = "$DEVICE" ] || return 0

		local oldip
		local wanip=$(find_6in4_wanip "$wandev")
		config_get oldip "$cfg" ipaddr

		[ -n "$wanip" ] && [ "$oldip" != "$wanip" ] && {
			local tunnelid
			config_get tunnelid "$cfg" tunnelid

			local username
			config_get username "$cfg" username

			local password
			config_get password "$cfg" password

			[ -n "$tunnelid" ] && [ -n "$username" ] && [ -n "$password" ] && {
				password="$(echo -n "$password" | md5sum)"; password="${password%% *}"
				uci_set_state network "$cfg" ipaddr "$wanip"

				( wget -qO/dev/null "http://ipv4.tunnelbroker.net/ipv4_end.php?ipv4b=AUTO&user_id=$username&pass=$password&tunnel_id=$tunnelid" && ifup "$cfg" )&
			}
		}
	}

	config_foreach update_tunnel interface
fi