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Edit: dhcp-multi.sh
#!/usr/bin/sh # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*- # ex: ts=8 sw=4 sts=4 et filetype=sh # PATH=/usr/sbin:/usr/bin:/sbin:/bin # File to start dhclient requests on different interfaces in parallel . /lib/dracut-lib.sh . /lib/net-lib.sh netif=$1 do_vlan=$2 arg=$3 # Run dhclient in parallel do_dhclient() { local _COUNT=0 local _timeout local _DHCPRETRY _timeout=$(getarg rd.net.timeout.dhcp=) _DHCPRETRY=$(getargnum 1 1 1000000000 rd.net.dhcp.retry=) while [ $_COUNT -lt "$_DHCPRETRY" ]; do info "Starting dhcp for interface $netif" dhclient "$arg" \ ${_timeout:+--timeout "$_timeout"} \ -q \ -1 \ -cf /etc/dhclient.conf \ -pf /tmp/dhclient."$netif".pid \ -lf /tmp/dhclient."$netif".lease \ "$netif" & wait $! 2> /dev/null # wait will return the return value of dhclient retv=$? # dhclient and hence wait returned success, 0. if [ $retv -eq 0 ]; then return 0 fi # If dhclient exited before wait was called, or it was killed by # another thread for interface whose DHCP succeeded, then it will not # find the process with that pid and return error code 127. In that # case we need to check if /tmp/dhclient.$netif.lease exists. If it # does, it means dhclient finished executing before wait was called, # and it was successful (return 0). If /tmp/dhclient.$netif.lease # does not exist, then it means dhclient was killed by another thread # or it finished execution but failed dhcp on that interface. if [ $retv -eq 127 ]; then pid=$(cat /tmp/dhclient."$netif".pid) info "PID $pid was not found by wait for $netif" if [ -e /tmp/dhclient."$netif".lease ]; then info "PID $pid not found but DHCP successful on $netif" return 0 fi fi _COUNT=$((_COUNT + 1)) [ $_COUNT -lt "$_DHCPRETRY" ] && sleep 1 done warn "dhcp for interface $netif failed" # nuke those files since we failed; we might retry dhcp again if it's e.g. # `ip=dhcp,dhcp6` and we check for the PID file earlier rm -f /tmp/dhclient."$netif".pid /tmp/dhclient."$netif".lease return 1 } do_dhclient ret=$? # setup nameserver for s in "$dns1" "$dns2" $(getargs nameserver); do [ -n "$s" ] || continue echo nameserver "$s" >> /tmp/net."$netif".resolv.conf done if [ $ret -eq 0 ]; then : > /tmp/net."${netif}".up if [ -z "$do_vlan" ] && [ -e /sys/class/net/"${netif}"/address ]; then : > "/tmp/net.$(cat /sys/class/net/"${netif}"/address).up" fi # Check if DHCP also suceeded on another interface before this one. # We will always use the first one on which DHCP succeeded, by using # a commom file $IFNETFILE, to synchronize between threads. # Consider the race condition in which multiple threads # corresponding to different interfaces may try to read $IFNETFILE # and find it does not exist; they may all end up thinking they are the # first to succeed (hence more than one thread may end up writing to # $IFNETFILE). To take care of this, instead of checking if $IFNETFILE # exists to determine if we are the first, we create a symbolic link # in $IFNETFILE, pointing to the interface name ($netif), thus storing # the interface name in the link pointer. # Creating a link will fail, if the link already exists, hence kernel # will take care of allowing only first thread to create link, which # takes care of the race condition for us. Subsequent threads will fail. # Also, the link points to the interface name, which will tell us which # interface succeeded. if ln -s "$netif" "$IFNETFILE" 2> /dev/null; then intf=$(readlink "$IFNETFILE") if [ -e /tmp/dhclient."$intf".lease ]; then info "DHCP successful on interface $intf" # Kill all existing dhclient calls for other interfaces, since we # already got one successful interface npid=$(cat /tmp/dhclient."$netif".pid) pidlist=$(pgrep dhclient) for pid in $pidlist; do [ "$pid" -eq "$npid" ] && continue kill -9 "$pid" > /dev/null 2>&1 done else echo "ERROR! $IFNETFILE exists but /tmp/dhclient.$intf.lease does not exist!!!" fi else info "DHCP success on $netif, and also on $intf" exit 0 fi exit $ret fi