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# skip all of this if dhclient-script running by stop command defined below
if [ -z ${CONTROLLED_STOP} ] ; then
# stop dhclient for this interface, if it is not current one
# get PID for current dhclient
current_dhclient=`ps --no-headers --format ppid --pid $$ | awk '{ print \$1 }'`
# get PID for master process (current can be a fork)
master_dhclient=`ps --no-headers --format ppid --pid $current_dhclient | awk '{ print \$1 }'`
# get IP version for current dhclient
ipversion_arg=`ps --no-headers --format args --pid $current_dhclient | awk 'match(\$0, /\s-(4|6)\s/, IPV) { printf("%s", IPV[1]) }'`
# get list of all dhclient running for current interface
if [[ $ipversion_arg == "6" ]]; then
dhclients_pids=(`pgrep -f "dhclient.*\s-6\s.*\s$interface(\s|$)"`)
else
dhclients_pids=(`ps --no-headers --format pid,args -C dhclient | awk "{ if(match(\\$0, /\s${interface}(\s|$)/) && !match(\\$0, /\s-6\s/)) printf(\"%s\n\", \\$1) }"`)
fi
logmsg info "Current dhclient PID: $current_dhclient, Parent PID: $master_dhclient, IP version: $ipversion_arg, All dhclients for interface $interface: ${dhclients_pids[@]}"
# stop all dhclients for current interface, except current one
for dhclient in ${dhclients_pids[@]}; do
if ([ $dhclient -ne $current_dhclient ] && [ $dhclient -ne $master_dhclient ]); then
# get path to PID-file of dhclient process
local dhclient_pidfile=`ps --no-headers --format args --pid $dhclient | awk 'match(\$0, ".*-pf (/.*pid) .*", PF) { print PF[1] }'`
# get path to lease-file of dhclient process
local dhclient_leasefile=`ps --no-headers --format args --pid $dhclient | awk 'match(\$0, ".*-lf (/\\\S*leases) .*", LF) { print LF[1] }'`
# stop dhclient with native command - this will run dhclient-script with correct reason unlike simple kill
logmsg info "Stopping dhclient with PID: ${dhclient}, PID file: ${dhclient_pidfile}, Leases file: ${dhclient_leasefile}"
if [[ -e $dhclient_pidfile ]]; then
dhclient -e CONTROLLED_STOP=yes -x -pf $dhclient_pidfile -lf $dhclient_leasefile
else
logmsg error "PID file $dhclient_pidfile does not exists, killing dhclient with SIGTERM signal"
kill -s 15 ${dhclient}
fi
fi
done
fi
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