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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
#!/bin/sh
#
# $OpenBSD: dhclient-script,v 1.10 2006/06/03 19:30:06 mpf Exp $
#
# Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
#
#
# Helper functions that implement common actions.
#
delete_old_address() {
if [ -n "$old_ip_address" ]; then
ifconfig $interface inet $old_ip_address delete $medium
route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
fi
}
add_new_address() {
ifconfig $interface \
inet $new_ip_address \
netmask $new_subnet_mask \
broadcast $new_broadcast_address \
$medium
# XXX Original TIMEOUT code did not do this unless $new_routers was set?
route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
}
delete_old_alias() {
if [ -n "$alias_ip_address" ]; then
ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
fi
}
add_new_alias() {
if [ -n "$alias_ip_address" ]; then
ifconfig $interface inet $alias_ip_address alias netmask \
$alias_subnet_mask
route add $alias_ip_address 127.0.0.1
fi
}
delete_old_routes() {
# Delete existing default route. We only allow one, so no need to
# process $old_routers list.
route delete default >/dev/null 2>&1
if [ -n "$old_static_routes" ]; then
set $old_static_routes
while [ $# -gt 1 ]; do
route delete "$1" "$2"
shift; shift
done
fi
arp -dan
}
add_new_routes() {
route delete default >/dev/null 2>&1
for router in $new_routers; do
if [ "$new_ip_address" = "$router" ]; then
route add default -iface $router >/dev/null 2>&1
else
route add default $router >/dev/null 2>&1
fi
# 2nd and subsequent default routers error out, so explicitly
# stop processing the list after the first one.
break
done
if [ -n "$new_static_routes" ]; then
set $new_static_routes
while [ $# -gt 1 ]; do
route add $1 $2
shift; shift
done
fi
}
add_new_resolv_conf() {
# XXX Old code did not create/update resolv.conf unless both
# $new_domain_name and $new_domain_name_servers were provided. PR
# #3135 reported some ISPs only provide $new_domain_name_servers and
# thus broke the script. This code creates the resolv.conf if either
# are provided.
rm -f /etc/resolv.conf.std
if [ -n "$new_domain_name" ]; then
echo "search $new_domain_name" >>/etc/resolv.conf.std
fi
if [ -n "$new_domain_name_servers" ]; then
for nameserver in $new_domain_name_servers; do
echo "nameserver $nameserver" >>/etc/resolv.conf.std
done
fi
if [ -f /etc/resolv.conf.std ]; then
if [ -f /etc/resolv.conf.tail ]; then
cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
fi
# In case (e.g. during OpenBSD installs) /etc/resolv.conf
# is a symbolic link, take care to preserve the link and write
# the new data in the correct location.
if [ -f /etc/resolv.conf ]; then
cat /etc/resolv.conf > /etc/resolv.conf.save
fi
cat /etc/resolv.conf.std > /etc/resolv.conf
rm -f /etc/resolv.conf.std
# Try to ensure correct ownership and permissions.
chown -RL root:wheel /etc/resolv.conf
chmod -RL 644 /etc/resolv.conf
return 0
fi
return 1
}
#
# Start of active code.
#
if [ -n "$new_network_number" ]; then
echo "New Network Number: $new_network_number"
fi
if [ -n "$new_broadcast_address" ]; then
echo "New Broadcast Address: $new_broadcast_address"
fi
case $reason in
MEDIUM)
ifconfig $interface $medium
sleep 1
;;
PREINIT)
delete_old_alias
ifconfig $interface up
;;
ARPCHECK|ARPSEND)
;;
BOUND|RENEW|REBIND|REBOOT)
if [ -n "$old_ip_address" ]; then
if [ "$old_ip_address" != "$alias_ip_address" ]; then
delete_old_alias
fi
if [ "$old_ip_address" != "$new_ip_address" ]; then
delete_old_address
delete_old_routes
fi
fi
if [ "$reason" = BOUND ] || \
[ "$reason" = REBOOT ] || \
[ -z "$old_ip_address" ] || \
[ "$old_ip_address" != "$new_ip_address" ]; then
add_new_address
add_new_routes
fi
if [ "$new_ip_address" != "$alias_ip_address" ]; then
add_new_alias
fi
add_new_resolv_conf
;;
EXPIRE|FAIL)
delete_old_alias
if [ -n "$old_ip_address" ]; then
delete_old_address
delete_old_routes
fi
# XXX Why add alias we just deleted above?
add_new_alias
if [ -f /etc/resolv.conf.save ]; then
cat /etc/resolv.conf.save > /etc/resolv.conf
fi
;;
TIMEOUT)
delete_old_alias
add_new_address
sleep 1
if [ -n "$new_routers" ]; then
set "$new_routers"
if ping -q -c 1 -w 1 "$1"; then
if [ "$new_ip_address" != "$alias_ip_address" ]; then
add_new_alias
fi
add_new_routes
if add_new_resolv_conf; then
exit 0
fi
fi
fi
ifconfig $interface inet $new_ip_address delete $medium
# XXX Why not a delete_old_address as before all other invocations of
# delete_old_routes?
delete_old_routes
exit 1
;;
esac
exit 0
|
