dhclient - Drop medium/alias useless utilization.
[dragonfly.git] / sbin / dhclient / dhclient-script
1 #!/bin/sh
2 #
3 # $OpenBSD: src/sbin/dhclient/dhclient-script,v 1.19 2011/04/04 11:14:52 krw Exp $
4 #
5 # Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>
6 #
7 # Permission to use, copy, modify, and distribute this software for any
8 # purpose with or without fee is hereby granted, provided that the above
9 # copyright notice and this permission notice appear in all copies.
10 #
11 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 #
19 #
20
21 #
22 # Helper functions that implement common actions.
23 #
24
25 delete_old_address() {
26         if [ -n "$old_ip_address" ]; then
27                 ifconfig $interface inet $old_ip_address delete
28                 #route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
29         fi
30 }
31
32 add_new_address() {
33         ifconfig $interface \
34                 inet $new_ip_address \
35                 netmask $new_subnet_mask \
36                 broadcast $new_broadcast_address
37
38         # XXX Original TIMEOUT code did not do this unless $new_routers was set?
39         #route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
40 }
41
42 delete_old_routes() {
43         if [ -n "$old_static_routes" ]; then
44                 set $old_static_routes
45                 while [ $# -gt 1 ]; do
46                         route delete "$1" "$2"
47                         shift; shift
48                 done
49         fi
50
51         arp -dan
52 }
53
54 add_new_routes() {
55         for router in $new_routers; do
56                 route -q delete default
57                 if [ "$new_ip_address" = "$router" ]; then
58                         route -q add default -iface $router
59                 else
60                         route -q add default $router
61                 fi
62                 # 2nd and subsequent default routers error out, so explicitly
63                 # stop processing the list after the first one.
64                 break
65         done
66
67         if [ -n "$new_static_routes" ]; then
68                 set $new_static_routes
69                 while [ $# -gt 1 ]; do
70                         route add $1 $2
71                         shift; shift
72                 done
73         fi
74 }
75
76 add_new_resolv_conf() {
77         # Create resolv.conf when either $new_domain_name_servers or
78         # $new_domain_name are provided. As reported in PR#3135, some ISPs
79         # provide only $new_domain_name_servers.
80
81         rm -f /etc/resolv.conf.std
82
83         if [ -n "$new_domain_name" ]; then
84                 echo "search $new_domain_name" >>/etc/resolv.conf.std
85         fi
86
87         if [ -n "$new_domain_name_servers" ]; then
88                 for nameserver in $new_domain_name_servers; do
89                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
90                 done
91         fi
92
93         if [ -f /etc/resolv.conf.std ]; then
94                 if [ -f /etc/resolv.conf.tail ]; then
95                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
96                 fi
97
98                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
99                 # is a symbolic link, take care to preserve the link and write
100                 # the new data in the correct location.
101
102                 if [ -f /etc/resolv.conf ]; then
103                         cat /etc/resolv.conf > /etc/resolv.conf.save
104                 fi
105                 cat /etc/resolv.conf.std > /etc/resolv.conf
106                 rm -f /etc/resolv.conf.std
107
108                 # Try to ensure correct ownership and permissions.
109                 chown -RL root:wheel /etc/resolv.conf
110                 chmod -RL 644 /etc/resolv.conf
111
112                 return 0
113         fi
114
115         return 1
116 }
117
118 #
119 # Start of active code.
120 #
121
122 case $reason in
123 MEDIUM)
124         # Not called by OpenBSD dhclient(8).
125         ;;
126
127 PREINIT)
128         # Not called by OpenBSD dhclient(8).
129         ;;
130
131 ARPSEND)
132         # Not called by OpenBSD dhclient(8).
133         exit 1
134         ;;
135
136 ARPCHECK)
137         # Not called by OpenBSD dhclient(8).
138         # Always succeed. i.e. accept lease.
139         ;;
140
141 BOUND|RENEW|REBIND|REBOOT)
142         if [ -n "$old_ip_address" ]; then
143                 if [ "$old_ip_address" != "$new_ip_address" ]; then
144                         delete_old_address
145                         delete_old_routes
146                 fi
147         fi
148         if [ "$reason" = BOUND ] ||
149            [ "$reason" = REBOOT ] ||
150            [ -z "$old_ip_address" ] ||
151            [ "$old_ip_address" != "$new_ip_address" ]; then
152                 add_new_address
153                 add_new_routes
154         fi
155         add_new_resolv_conf
156         ;;
157
158 EXPIRE|FAIL)
159         if [ -n "$old_ip_address" ]; then
160                 delete_old_address
161                 delete_old_routes
162         fi
163         if [ -f /etc/resolv.conf.save ]; then
164                 cat /etc/resolv.conf.save > /etc/resolv.conf
165         fi
166         ;;
167
168 TIMEOUT)
169         add_new_address
170         sleep 1
171         if [ -n "$new_routers" ]; then
172                 set "$new_routers"
173                 if ping -q -c 1 -w 1 "$1"; then
174                         add_new_routes
175                         if add_new_resolv_conf; then
176                                 exit 0
177                         fi
178                 fi
179         fi
180         ifconfig $interface inet $new_ip_address delete $medium
181         # XXX Why not a delete_old_address as before all other invocations of
182         #     delete_old_routes?
183         delete_old_routes
184         exit 1
185         ;;
186 esac
187
188 exit 0