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dhclient
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2006-04-25
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# Copyright (c) 2004-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-src/rc-scripts/net-scripts/net.modules.d/dhclient,v 1.18.2.3 2005/01/25 10:42:54 uberlord Exp $
# Contributed by Roy Marples (uberlord@gentoo.org)
# Fix any potential localisation problems
# Note that LC_ALL trumps LC_anything_else according to locale(7)
dhclient() {
LC_ALL=C /sbin/dhclient "$@"
}
# char* dhclient_provides(void)
#
# Returns a string to change module definition for starting up
dhclient_provides() {
echo "dhcp"
}
# void dhclient_depend(void)
#
# Sets up the dependancies for the module
dhclient_depend() {
after interface
}
# bool dhclient_check_installed(void)
#
# Returns 1 if dhclient is installed, otherwise 0
dhclient_check_installed() {
[[ -x /sbin/dhclient ]] && return 0
${1:-false} && eerror "For DHCP (dhclient) support, emerge net-misc/dhcp"
return 1
}
# char* dhclient_get_script(void)
#
# Returns the filename of the script to run
dhclient_get_script() {
local module=$( interface_module )
echo "${MODULES_DIR}/helpers.d/dhclient-${module}"
}
# bool dhclient_check_depends(void)
#
# Checks to see if we have the needed functions
dhclient_check_depends() {
local f
for f in interface_variable interface_device interface_is_up interface_get_address interface_module; do
[[ $( type -t ${f} ) == function ]] && continue
eerror "dhclient: missing required function ${f}\n"
return 1
done
return 0
}
# char* dhclient_get_vars(char *interface)
#
# Returns a string spaced with possible user set
# configuration variables
dhclient_get_vars() {
echo "dhclient_${1} dhcp_${1}"
}
# bool dhclient_stop(char *iface)
#
# Stop dhclient on an interface
# Always returns 0
dhclient_stop() {
local iface=${1} dhcp release pidfile="/var/run/dhclient-${1}.pid"
dhclient_check_installed || return 0
[[ ! -f ${pidfile} ]] && return 0
# We check for a dhclient process first as if we attempt to release
# an interface for which dhclient has obtained an IP in the past
# it causes a "RELEASE" event anyway.
local pid=$( cat ${pidfile} )
local script=$( dhclient_get_script )
eval dhcp=\" \$\{dhcp_${ifvar}\} \"
ebegin "Stopping dhclient on ${iface}"
if [[ ${dhcp} == *' release '* ]]; then
local r=$( dhclient -q -r -sf ${script} -pf ${pidfile} ${iface} )
[[ ${r} == deconfig ]]
eend $? "dhclient returned a ${r}"
else
kill -s TERM ${pid} 2>/dev/null
clean_pidfile ${pidfile}
eend 0
fi
return 0
}
# bool dhclient_start(char *iface)
#
# Start DHCP on an interface by calling dhclient $iface $options
#
# Returns 0 (true) when a DHCP address is obtained, otherwise 1
dhclient_start() {
local iface=${1} opts pidfile="/var/run/dhclient-${1}.pid"
local ifvar=$( interface_variable ${iface} ) x
local cffile="/etc/dhclient.conf"
interface_exists ${iface} true || return 1
local script=$( dhclient_get_script )
# Load our options
eval opts=\" \$\{dhclient_${ifvar}\} \"
# Work out our cffile
x="${opts##* -cf }"
if [[ ${x} != ${opts} ]]; then
x="${x%% *}"
if [[ -n ${x} ]]; then
cffile="${x}"
opts="${opts//-cf ${cffile}/}"
fi
fi
opts="${opts} -cf ${cffile}"
# Ensure that the cffile does not contain any script lines
# as that will stop our helpers from running
if [[ -e ${cffile} ]] ; then
if grep -q "^[ \t]*script " "${cffile}" ; then
eerror "You have to remove the script parameter from ${cffile}"
return 1
fi
fi
# Bring up DHCP for this interface (or alias)
ebegin "Running dhclient"
if ! clean_pidfile ${pidfile} ; then
ewarn "dhclient is already running on ${iface}"
eend 0
return 0
fi
eval opts=\"\$\{dhclient_${ifvar}\}\"
local x=$( dhclient ${opts} -1 -sf ${script} -pf ${pidfile} -q ${iface} 2>&1 )
# We just check the last 5 letters
[[ ${x:${#x} - 5:5} == bound ]]
if [[ $? != 0 ]]; then
echo "${x}" >&2
# We need to kill the process if we fail
kill -s TERM $( < ${pidfile} ) 2>/dev/null
eend 1
return 1
fi
eend 0
# DHCP succeeded, show address retrieved
local addr=$( interface_get_address ${iface} )
einfo "${iface} received address ${addr}"
return 0
}