/usr/lib/dracut/modules.d/40network/dhclient-script.sh is in dracut-network 040+1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | #!/bin/sh
PATH=/usr/sbin:/usr/bin:/sbin:/bin
type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
type ip_to_var >/dev/null 2>&1 || . /lib/net-lib.sh
# We already need a set netif here
netif=$interface
# Huh? Interface configured?
[ -f "/tmp/net.$netif.up" ] && exit 0
setup_interface() {
ip=$new_ip_address
mtu=$new_interface_mtu
mask=$new_subnet_mask
bcast=$new_broadcast_address
gw=${new_routers%%,*}
domain=$new_domain_name
search=$(printf -- "$new_domain_search")
namesrv=$new_domain_name_servers
hostname=$new_host_name
lease_time=$new_dhcp_lease_time
[ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override
# Taken from debian dhclient-script:
# The 576 MTU is only used for X.25 and dialup connections
# where the admin wants low latency. Such a low MTU can cause
# problems with UDP traffic, among other things. As such,
# disallow MTUs from 576 and below by default, so that broken
# MTUs are ignored, but higher stuff is allowed (1492, 1500, etc).
if [ -n "$mtu" ] && [ $mtu -gt 576 ] ; then
if ! ip link set $netif mtu $mtu ; then
ip link set $netif down
ip link set $netif mtu $mtu
linkup $netif
fi
fi
ip addr add $ip${mask:+/$mask} ${bcast:+broadcast $bcast} \
valid_lft ${lease_time} preferred_lft ${lease_time} \
dev $netif
[ -n "$gw" ] && echo ip route replace default via $gw dev $netif > /tmp/net.$netif.gw
[ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
if [ -n "$namesrv" ] ; then
for s in $namesrv; do
echo nameserver $s
done
fi >> /tmp/net.$netif.resolv.conf
# Note: hostname can be fqdn OR short hostname, so chop off any
# trailing domain name and explicity add any domain if set.
[ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
}
setup_interface6() {
domain=$new_domain_name
search=$(printf -- "$new_domain_search")
namesrv=$new_domain_name_servers
hostname=$new_host_name
[ -n "$new_dhcp_lease_time" ] && lease_time=$new_dhcp_lease_time
[ -n "$new_max_life" ] && lease_time=$new_max_life
preferred_lft=$lease_time
[ -n "$new_preferred_life" ] && preferred_lft=$new_preferred_life
[ -f /tmp/net.$netif.override ] && . /tmp/net.$netif.override
ip -6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
dev ${netif} scope global \
${lease_time:+valid_lft $lease_time} \
${preferred_lft:+preferred_lft ${preferred_lft}}
[ -n "${search}${domain}" ] && echo "search $search $domain" > /tmp/net.$netif.resolv.conf
if [ -n "$namesrv" ] ; then
for s in $namesrv; do
echo nameserver $s
done
fi >> /tmp/net.$netif.resolv.conf
# Note: hostname can be fqdn OR short hostname, so chop off any
# trailing domain name and explicity add any domain if set.
[ -n "$hostname" ] && echo "echo ${hostname%.$domain}${domain:+.$domain} > /proc/sys/kernel/hostname" > /tmp/net.$netif.hostname
}
case $reason in
PREINIT)
echo "dhcp: PREINIT $netif up"
linkup $netif
;;
PREINIT6)
echo "dhcp: PREINIT $netif up"
linkup $netif
;;
BOUND)
echo "dhcp: BOND setting $netif"
unset layer2
if [ -f /sys/class/net/$netif/device/layer2 ]; then
read layer2 < /sys/class/net/$netif/device/layer2
fi
if [ "$layer2" != "0" ]; then
if ! arping -q -D -c 2 -I $netif $new_ip_address ; then
warn "Duplicate address detected for $new_ip_address while doing dhcp. retrying"
exit 1
fi
fi
unset layer2
setup_interface
set | while read line; do
[ "${line#new_}" = "$line" ] && continue
echo "$line"
done >/tmp/dhclient.$netif.dhcpopts
{
echo '. /lib/net-lib.sh'
echo "setup_net $netif"
echo "source_hook initqueue/online $netif"
[ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif"
echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
} > $hookdir/initqueue/setup_net_$netif.sh
echo "[ -f /tmp/net.$netif.did-setup ]" > $hookdir/initqueue/finished/dhclient-$netif.sh
>/tmp/net.$netif.up
;;
BOUND6)
echo "dhcp: BOND6 setting $netif"
setup_interface6
set | while read line; do
[ "${line#new_}" = "$line" ] && continue
echo "$line"
done >/tmp/dhclient.$netif.dhcpopts
{
echo '. /lib/net-lib.sh'
echo "setup_net $netif"
echo "source_hook initqueue/online $netif"
[ -e /tmp/net.$netif.manualup ] || echo "/sbin/netroot $netif"
echo "rm -f -- $hookdir/initqueue/setup_net_$netif.sh"
} > $hookdir/initqueue/setup_net_$netif.sh
echo "[ -f /tmp/net.$netif.did-setup ]" > $hookdir/initqueue/finished/dhclient-$netif.sh
>/tmp/net.$netif.up
;;
*) echo "dhcp: $reason";;
esac
exit 0
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