| Current Path : /lib/dracut/modules.d/40network/ |
Linux gator3171.hostgator.com 4.19.286-203.ELK.el7.x86_64 #1 SMP Wed Jun 14 04:33:55 CDT 2023 x86_64 |
| Current File : //lib/dracut/modules.d/40network/dhclient-script.sh |
#!/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
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=$interface
setup_interface() {
ip=$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=$new_host_name
[ -n "$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
# 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} dev $netif \
${lease_time:+valid_lft $lease_time} \
${preferred_lft:+preferred_lft ${preferred_lft}}
if [ -n "$gw" ] ; then
if [ "$mask" == "255.255.255.255" ] ; then
# point-to-point connection => set explicit route to gateway
echo ip route add $gw dev $netif > /tmp/net.$netif.gw
fi
echo ip route replace default via $gw dev $netif >> /tmp/net.$netif.gw
fi
[ -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
}
function parse_option_121() {
while [ $# -ne 0 ]; do
mask="$1"
shift
# Is the destination a multicast group?
if [ $1 -ge 224 -a $1 -lt 240 ]; then
multicast=1
else
multicast=0
fi
# Parse the arguments into a CIDR net/mask string
if [ $mask -gt 24 ]; then
destination="$1.$2.$3.$4/$mask"
shift; shift; shift; shift
elif [ $mask -gt 16 ]; then
destination="$1.$2.$3.0/$mask"
shift; shift; shift
elif [ $mask -gt 8 ]; then
destination="$1.$2.0.0/$mask"
shift; shift
else
destination="$1.0.0.0/$mask"
shift
fi
# Read the gateway
gateway="$1.$2.$3.$4"
shift; shift; shift; shift
# Multicast routing on Linux
# - If you set a next-hop address for a multicast group, this breaks with Cisco switches
# - If you simply leave it link-local and attach it to an interface, it works fine.
if [ $multicast -eq 1 ]; then
temp_result="$destination dev $interface"
else
temp_result="$destination via $gateway dev $interface"
fi
echo "/sbin/ip route add $temp_result"
done
}
case $reason in
PREINIT)
echo "dhcp: PREINIT $netif up"
linkup $netif
;;
PREINIT6)
echo "dhcp: PREINIT6 $netif up"
linkup $netif
wait_for_ipv6_dad_link $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 -f -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 $netif"
if [ -n "$new_classless_static_routes" ]; then
parse_option_121 $new_classless_static_routes
fi
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.$netif.up
if [ -e /sys/class/net/${netif}/address ]; then
> /tmp/net.$(cat /sys/class/net/${netif}/address).up
fi
;;
RENEW|REBIND)
unset lease_time
[ -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
ip -4 addr change ${new_ip_address}/${new_subnet_mask} broadcast ${new_broadcast_address} dev ${interface} \
${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \
>/dev/null 2>&1
;;
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.$netif.up
if [ -e /sys/class/net/${netif}/address ]; then
> /tmp/net.$(cat /sys/class/net/${netif}/address).up
fi
;;
RENEW6|REBIND6)
unset lease_time
[ -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
ip -6 addr change ${new_ip6_address}/${new_ip6_prefixlen} dev ${interface} scope global \
${lease_time:+valid_lft $lease_time} ${preferred_lft:+preferred_lft ${preferred_lft}} \
>/dev/null 2>&1
;;
*) echo "dhcp: $reason";;
esac
exit 0