dhclient - Improve comment about resolv.conf creation.
[dragonfly.git] / sbin / dhclient / dhclient-script
CommitLineData
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1#!/bin/sh
2#
b976f566 3# $OpenBSD: src/sbin/dhclient/dhclient-script,v 1.13 2009/01/24 13:59:43 krw Exp $
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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
25delete_old_address() {
26 if [ -n "$old_ip_address" ]; then
27 ifconfig $interface inet $old_ip_address delete $medium
34910103 28 #route delete "$old_ip_address" 127.0.0.1 >/dev/null 2>&1
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29 fi
30}
31
32add_new_address() {
33 ifconfig $interface \
34 inet $new_ip_address \
35 netmask $new_subnet_mask \
36 broadcast $new_broadcast_address \
37 $medium
38
39 # XXX Original TIMEOUT code did not do this unless $new_routers was set?
34910103 40 #route add $new_ip_address 127.0.0.1 >/dev/null 2>&1
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41}
42
43delete_old_alias() {
44 if [ -n "$alias_ip_address" ]; then
45 ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
34910103 46# #route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
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47 fi
48}
49
50add_new_alias() {
51 if [ -n "$alias_ip_address" ]; then
52 ifconfig $interface inet $alias_ip_address alias netmask \
53 $alias_subnet_mask
34910103 54 #route add $alias_ip_address 127.0.0.1
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55 fi
56}
57
58delete_old_routes() {
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59 if [ -n "$old_static_routes" ]; then
60 set $old_static_routes
61 while [ $# -gt 1 ]; do
62 route delete "$1" "$2"
63 shift; shift
64 done
65 fi
66
67 arp -dan
68}
69
70add_new_routes() {
846204b6 71 for router in $new_routers; do
3a961bf3 72 route -q delete default
846204b6 73 if [ "$new_ip_address" = "$router" ]; then
3a961bf3 74 route -q add default -iface $router
846204b6 75 else
3a961bf3 76 route -q add default $router
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77 fi
78 # 2nd and subsequent default routers error out, so explicitly
79 # stop processing the list after the first one.
80 break
81 done
82
83 if [ -n "$new_static_routes" ]; then
84 set $new_static_routes
85 while [ $# -gt 1 ]; do
86 route add $1 $2
87 shift; shift
88 done
89 fi
90}
91
92add_new_resolv_conf() {
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93 # Create resolv.conf when either $new_domain_name_servers or
94 # $new_domain_name are provided. As reported in PR#3135, some ISPs
95 # provide only $new_domain_name_servers.
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96
97 rm -f /etc/resolv.conf.std
98
99 if [ -n "$new_domain_name" ]; then
100 echo "search $new_domain_name" >>/etc/resolv.conf.std
101 fi
102
103 if [ -n "$new_domain_name_servers" ]; then
104 for nameserver in $new_domain_name_servers; do
105 echo "nameserver $nameserver" >>/etc/resolv.conf.std
106 done
107 fi
108
109 if [ -f /etc/resolv.conf.std ]; then
110 if [ -f /etc/resolv.conf.tail ]; then
111 cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
112 fi
113
114 # In case (e.g. during OpenBSD installs) /etc/resolv.conf
115 # is a symbolic link, take care to preserve the link and write
116 # the new data in the correct location.
117
118 if [ -f /etc/resolv.conf ]; then
119 cat /etc/resolv.conf > /etc/resolv.conf.save
120 fi
121 cat /etc/resolv.conf.std > /etc/resolv.conf
122 rm -f /etc/resolv.conf.std
123
124 # Try to ensure correct ownership and permissions.
125 chown -RL root:wheel /etc/resolv.conf
126 chmod -RL 644 /etc/resolv.conf
127
128 return 0
129 fi
130
131 return 1
132}
133
134#
135# Start of active code.
136#
137
138case $reason in
139MEDIUM)
140 ifconfig $interface $medium
141 sleep 1
142 ;;
143
144PREINIT)
145 delete_old_alias
146 ifconfig $interface up
147 ;;
148
149ARPCHECK|ARPSEND)
150 ;;
151
152BOUND|RENEW|REBIND|REBOOT)
153 if [ -n "$old_ip_address" ]; then
154 if [ "$old_ip_address" != "$alias_ip_address" ]; then
155 delete_old_alias
156 fi
157 if [ "$old_ip_address" != "$new_ip_address" ]; then
158 delete_old_address
159 delete_old_routes
160 fi
161 fi
162 if [ "$reason" = BOUND ] ||
163 [ "$reason" = REBOOT ] ||
164 [ -z "$old_ip_address" ] ||
165 [ "$old_ip_address" != "$new_ip_address" ]; then
166 add_new_address
167 add_new_routes
168 fi
169 if [ "$new_ip_address" != "$alias_ip_address" ]; then
170 add_new_alias
171 fi
172 add_new_resolv_conf
173 ;;
174
175EXPIRE|FAIL)
176 delete_old_alias
177 if [ -n "$old_ip_address" ]; then
178 delete_old_address
179 delete_old_routes
180 fi
181 # XXX Why add alias we just deleted above?
182 add_new_alias
183 if [ -f /etc/resolv.conf.save ]; then
184 cat /etc/resolv.conf.save > /etc/resolv.conf
185 fi
186 ;;
187
188TIMEOUT)
189 delete_old_alias
190 add_new_address
191 sleep 1
192 if [ -n "$new_routers" ]; then
193 set "$new_routers"
194 if ping -q -c 1 -w 1 "$1"; then
195 if [ "$new_ip_address" != "$alias_ip_address" ]; then
196 add_new_alias
197 fi
198 add_new_routes
199 if add_new_resolv_conf; then
200 exit 0
201 fi
202 fi
203 fi
204 ifconfig $interface inet $new_ip_address delete $medium
205 # XXX Why not a delete_old_address as before all other invocations of
206 # delete_old_routes?
207 delete_old_routes
208 exit 1
209 ;;
210esac
211
212exit 0