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
|
#!/bin/sh
set -e
# reduced dhclient-script for the Debian installer
# changes by Joshua Kwan <joshk@triplehelix.org>,
# Bastian Blank <waldi@debian.org>
# dhclient-script for Linux. Dan Halbert, March, 1997.
# Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
# Modified for Debian. Matt Zimmerman and Eloy Paris, December 2003
make_resolv_conf() {
if [ -n "$new_domain_name" ] || [ -n "$new_domain_name_servers" ]; then
local new_resolv_conf=/etc/resolv.conf.dhclient-new
rm -f $new_resolv_conf
if [ -n "$new_domain_name" ]; then
echo "search $new_domain_name" >>$new_resolv_conf
fi
for nameserver in $new_domain_name_servers; do
echo "nameserver $nameserver" >>$new_resolv_conf
done
mv $new_resolv_conf /etc/resolv.conf
fi
}
set_hostname() {
local current_hostname=$(cat /proc/sys/kernel/hostname)
if [ -z "$current_hostname" ] || [ "$current_hostname" = "(none)" ]; then
echo "$new_host_name" > /proc/sys/kernel/hostname
fi
}
if [ -n "$new_subnet_mask" ]; then
new_mask="/$(ptom $new_subnet_mask)"
fi
if [ -n "$old_subnet_mask" ]; then
old_mask="/$(ptom $old_subnet_mask)"
fi
if [ -n "$new_broadcast_address" ]; then
new_broadcast_arg="broadcast $new_broadcast_address"
fi
if [ -n "$old_broadcast_address" ]; then
old_broadcast_arg="broadcast $old_broadcast_address"
fi
# Execute the operation
case "$reason" in
MEDIUM|ARPCHECK|ARPSEND)
# Do nothing
;;
PREINIT)
ip link set $interface up
# We need to give the kernel some time to get the interface up.
sleep 1
;;
BOUND|RENEW|REBIND|REBOOT)
set_hostname
if [ -n "$old_ip_address" ] && \
[ "$old_ip_address" != "$new_ip_address" ]; then
# IP address changed. Bringing down the interface will delete all routes,
# and clear the ARP cache.
ip addr del $old_ip_address$old_mask $old_broadcast_arg dev $interface
ip link set $interface down
fi
if [ -n "$new_interface_mtu" ]; then
ip link set $interface mtu $new_interface_mtu || true
fi
if [ -z "$old_ip_address" ] || [ "$old_ip_address" != "$new_ip_address" ] || \
[ "$reason" = "BOUND" ] || [ "$reason" = "REBOOT" ]; then
ip link set $interface up
ip addr flush dev $interface
ip addr add $new_ip_address$new_mask $new_broadcast_arg dev $interface
for router in $new_routers; do
ip route add default via $router
done
fi
make_resolv_conf
# Get the domain name into a file suitable for netcfg to read.
echo -n "$new_domain_name" > /tmp/domain_name
;;
EXPIRE|FAIL|RELEASE|STOP)
if [ -n "$old_ip_address" ]; then
# Shut down interface, which will delete routes and clear arp cache.
ip addr flush dev $interface
ip link set $interface down
fi
;;
TIMEOUT)
ip link set $interface down
;;
esac
exit 0
|
