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#!/bin/bash
# Copyright (c) 2004-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# Contributed by Roy Marples (uberlord@gentoo.org)

# Fix any potential localisation problems
# Note that LC_ALL trumps LC_anything_else according to locale(7)
dhcpcd() {
	LC_ALL=C /sbin/dhcpcd "$@"
}

# char* dhcpcd_provides(void)
#
# Returns a string to change module definition for starting up
dhcpcd_provides() {
	echo "dhcp"
}

# void dhcpcd_depend(void)
#
# Sets up the dependancies for the module
dhcpcd_depend() {
	after interface
}

# bool dhcpcd_check_installed(void)
#
# Returns 1 if dhcpcd is installed, otherwise 0
dhcpcd_check_installed() {
	if [[ -x /sbin/dhcpcd ]]; then
		if dhcpcd -h 2>&1 | grep -q "etcDir" ; then
			return 0
		else
			${1:-false} && eerror "We require dhcpcd-1.3.22_p4-r12 or newer"
			return 1
		fi
	fi

	${1:-false} && eerror "For DHCP (dhcpcd) support, emerge net-misc/dhcpcd"
	return 1
}

# bool dhcpcd_check_depends(void)
#
# Checks to see if we have the needed functions
dhcpcd_check_depends() {
	local f

	for f in interface_exists interface_get_address; do
		[[ $( type -t "${f}" ) == "function" ]] && continue
		eerror "dhcpcd: missing required function ${f}\n"
		return 1
	done

	return 0
}

# char* dhcpcd_get_vars(char *interface)
#
# Returns a string spaced with possible user set
# configuration variables
dhcpcd_get_vars() {
	echo "dhcpcd_$1 dhcp_$1"
}

# bool dhcpcd_stop(char *iface)
#
# Stop DHCP on an interface by calling dhcpcd -z $iface
#
# Returns 0 (true) when a DHCP address dropped
# otherwise return 1
dhcpcd_stop() {
	local iface=$1 count signal pidfile="/var/run/dhcpcd-$1.pid" d

	dhcpcd_check_installed || return 0

	[[ ! -f ${pidfile} ]] && return 0

	ebegin "Stopping dhcpcd on ${iface}"
	local pid=$( < "${pidfile}" )

	local ifvar=$( bash_variable "${iface}" )
	eval d=\" \$\{dhcp_${ifvar}\} \"
	[[ ${d} == "  " ]] && d=" ${dhcp} "

	if [[ ${d} == *" release "* ]]; then
		signal="HUP"
	else
		signal="TERM"
	fi

	kill -s "${signal}" "${pid}" &>/dev/null 
	process_finished "${pid}" dhcpcd
	eend $? "timed out"
	return $?
}

# bool dhcpcd_start(char *iface)
#
# Start DHCP on an interface by calling dhcpcd $iface $options
#
# Returns 0 (true) when a DHCP address is obtained, otherwise 1
dhcpcd_start() {
	local iface="$1" opts hostname pidfile="/var/run/dhcpcd-$1.pid"
	local ifvar=$( bash_variable "${iface}" ) metric d

	interface_exists "${iface}" true || return 1

	# Get our options
	eval opts=\" \$\{dhcpcd_${ifvar}\} \"

	# Map some generic options to dhcpcd
	eval d=\" \$\{dhcp_${ifvar}\} \"
	[[ ${d} == "  " ]] && d=" ${dhcp} "
	[[ ${d} == *" nodns "* ]] && opts="${opts} -R"
	[[ ${d} == *" nontp "* ]] && opts="${opts} -N"
	[[ ${d} == *" nonis "* ]] && opts="${opts} -Y"
	[[ ${d} == *" nogateway "* ]] && opts="${opts} -G"

	# We transmit the hostname by default
	if [[ ${d} != *" nosendhost "* && ${opts} != *" -h "* ]]; then
		hostname=$( hostname )
		[[ -n ${hostname} && ${hostname} != "(none)" \
		&& ${hostname} != "localhost" ]] \
		&& opts="-h \"${hostname}\" ${opts}"
	fi

	# Stop dhcpcd from bringing the interface down when we exit
	opts="${opts} -o"

	# Add our route metric
	eval metric=\"\$\{metric_${ifvar}\}\"
	[[ -n ${metric} ]] && opts="${opts} -m ${metric}"

	# Instruct dhcpcd to use our wrapper 
	opts="${opts} -c \"/lib/rcscripts/net.modules.d/helpers.d/dhcpcd-wrapper\""

	# Instruct dhcpcd to create it's files in our state dir
	opts="${opts} -e \"${statedir}/${iface}\""

	# Bring up DHCP for this interface (or alias)
	ebegin "Running dhcpcd"

	# Halt any existing dhcpcd process
	dhcpcd_stop "${iface}"

	[[ ! -d "${statedir}/${iface}" ]] && mkdir -m 0755 -p "${statedir}/${iface}"

	if [[ ${background} == "yes" ]]; then
		eval dhcpcd ${opts} ${iface} &
		eend 0
		go_background
	fi

	eval dhcpcd ${opts} ${iface}
	eend $? || return 1

	# DHCP succeeded, show address retrieved
	local addr=$( interface_get_address "${iface}" )
	einfo "${iface} received address ${addr}"

	return 0
}

# vim:ts=4