Merge branch 'vendor/OPENSSH'
[dragonfly.git] / sbin / dhclient / dhclient-script
1 #!/bin/sh
2 #
3 # $OpenBSD: dhclient-script,v 1.12 2007/08/11 17:58:55 krw Exp $
4 # $DragonFly: src/sbin/dhclient/dhclient-script,v 1.1 2008/08/30 16:07:58 hasso Exp $
5 #
6 # Copyright (c) 2003 Kenneth R Westerback <krw@openbsd.org>
7 #
8 # Permission to use, copy, modify, and distribute this software for any
9 # purpose with or without fee is hereby granted, provided that the above
10 # copyright notice and this permission notice appear in all copies.
11 #
12 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #
20 #
21
22 #
23 # Helper functions that implement common actions.
24 #
25
26 delete_old_address() {
27         if [ -n "$old_ip_address" ]; then
28                 ifconfig $interface inet $old_ip_address delete $medium
29                 route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
30         fi
31 }
32
33 add_new_address() {
34         ifconfig $interface \
35                 inet $new_ip_address \
36                 netmask $new_subnet_mask \
37                 broadcast $new_broadcast_address \
38                 $medium
39
40         # XXX Original TIMEOUT code did not do this unless $new_routers was set?
41         route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
42 }
43
44 delete_old_alias() {
45         if [ -n "$alias_ip_address" ]; then
46                 ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
47                 route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
48         fi
49 }
50
51 add_new_alias() {
52         if [ -n "$alias_ip_address" ]; then
53                 ifconfig $interface inet $alias_ip_address alias netmask \
54                     $alias_subnet_mask
55                 route add $alias_ip_address 127.0.0.1
56         fi
57 }
58
59 delete_old_routes() {
60         if [ -n "$old_static_routes" ]; then
61                 set $old_static_routes
62                 while [ $# -gt 1 ]; do
63                         route delete "$1" "$2"
64                         shift; shift
65                 done
66         fi
67
68         arp -dan
69 }
70
71 add_new_routes() {
72         for router in $new_routers; do
73                 route delete default >/dev/null 2>&1
74                 if [ "$new_ip_address" = "$router" ]; then
75                         route add default -iface $router >/dev/null 2>&1
76                 else
77                         route add default $router >/dev/null 2>&1
78                 fi
79                 # 2nd and subsequent default routers error out, so explicitly
80                 # stop processing the list after the first one.
81                 break
82         done
83
84         if [ -n "$new_static_routes" ]; then
85                 set $new_static_routes
86                 while [ $# -gt 1 ]; do
87                         route add $1 $2
88                         shift; shift
89                 done
90         fi
91 }
92
93 add_new_resolv_conf() {
94         # XXX Old code did not create/update resolv.conf unless both
95         # $new_domain_name and $new_domain_name_servers were provided.  PR
96         # #3135 reported some ISPs only provide $new_domain_name_servers and
97         # thus broke the script. This code creates the resolv.conf if either
98         # are provided.
99
100         rm -f /etc/resolv.conf.std
101
102         if [ -n "$new_domain_name" ]; then
103                 echo "search $new_domain_name" >>/etc/resolv.conf.std
104         fi
105
106         if [ -n "$new_domain_name_servers" ]; then
107                 for nameserver in $new_domain_name_servers; do
108                         echo "nameserver $nameserver" >>/etc/resolv.conf.std
109                 done
110         fi
111
112         if [ -f /etc/resolv.conf.std ]; then
113                 if [ -f /etc/resolv.conf.tail ]; then
114                         cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
115                 fi
116
117                 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
118                 # is a symbolic link, take care to preserve the link and write
119                 # the new data in the correct location.
120
121                 if [ -f /etc/resolv.conf ]; then
122                         cat /etc/resolv.conf > /etc/resolv.conf.save
123                 fi
124                 cat /etc/resolv.conf.std > /etc/resolv.conf
125                 rm -f /etc/resolv.conf.std
126
127                 # Try to ensure correct ownership and permissions.
128                 chown -RL root:wheel /etc/resolv.conf
129                 chmod -RL 644 /etc/resolv.conf
130
131                 return 0
132         fi
133
134         return 1
135 }
136
137 #
138 # Start of active code.
139 #
140
141 case $reason in
142 MEDIUM)
143         ifconfig $interface $medium
144         sleep 1
145         ;;
146
147 PREINIT)
148         delete_old_alias
149         ifconfig $interface up
150         ;;
151
152 ARPCHECK|ARPSEND)
153         ;;
154
155 BOUND|RENEW|REBIND|REBOOT)
156         if [ -n "$old_ip_address" ]; then
157                 if [ "$old_ip_address" != "$alias_ip_address" ]; then
158                         delete_old_alias
159                 fi
160                 if [ "$old_ip_address" != "$new_ip_address" ]; then
161                         delete_old_address
162                         delete_old_routes
163                 fi
164         fi
165         if [ "$reason" = BOUND ] ||
166            [ "$reason" = REBOOT ] ||
167            [ -z "$old_ip_address" ] ||
168            [ "$old_ip_address" != "$new_ip_address" ]; then
169                 add_new_address
170                 add_new_routes
171         fi
172         if [ "$new_ip_address" != "$alias_ip_address" ]; then
173                 add_new_alias
174         fi
175         add_new_resolv_conf
176         ;;
177
178 EXPIRE|FAIL)
179         delete_old_alias
180         if [ -n "$old_ip_address" ]; then
181                 delete_old_address
182                 delete_old_routes
183         fi
184         # XXX Why add alias we just deleted above?
185         add_new_alias
186         if [ -f /etc/resolv.conf.save ]; then
187                 cat /etc/resolv.conf.save > /etc/resolv.conf
188         fi
189         ;;
190
191 TIMEOUT)
192         delete_old_alias
193         add_new_address
194         sleep 1
195         if [ -n "$new_routers" ]; then
196                 set "$new_routers"
197                 if ping -q -c 1 -w 1 "$1"; then
198                         if [ "$new_ip_address" != "$alias_ip_address" ]; then
199                                 add_new_alias
200                         fi
201                         add_new_routes
202                         if add_new_resolv_conf; then
203                                 exit 0
204                         fi
205                 fi
206         fi
207         ifconfig $interface inet $new_ip_address delete $medium
208         # XXX Why not a delete_old_address as before all other invocations of
209         #     delete_old_routes?
210         delete_old_routes
211         exit 1
212         ;;
213 esac
214
215 exit 0