xref: /dragonfly/sbin/dhclient/dhclient-script (revision 9ddb8543) 
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
26delete_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
33add_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 $new_ip_address 127.0.0.1 >/dev/null 2>&1
42}
43
44delete_old_alias() {
45	if [ -n "$alias_ip_address" ]; then
46		ifconfig $interface inet $alias_ip_address delete > /dev/null 2>&1
47		route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
48	fi
49}
50
51add_new_alias() {
52	if [ -n "$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
59delete_old_routes() {
60	# Delete existing default route. We only allow one, so no need to
61	# process $old_routers list.
62	route delete default >/dev/null 2>&1
63
64	if [ -n "$old_static_routes" ]; then
65		set $old_static_routes
66		while [ $# -gt 1 ]; do
67			route delete "$1" "$2"
68			shift; shift
69		done
70	fi
71
72	arp -dan
73}
74
75add_new_routes() {
76	route delete default >/dev/null 2>&1
77	for router in $new_routers; do
78		if [ "$new_ip_address" = "$router" ]; then
79			route add default -iface $router >/dev/null 2>&1
80		else
81			route add default $router >/dev/null 2>&1
82		fi
83		# 2nd and subsequent default routers error out, so explicitly
84		# stop processing the list after the first one.
85		break
86	done
87
88	if [ -n "$new_static_routes" ]; then
89		set $new_static_routes
90		while [ $# -gt 1 ]; do
91			route add $1 $2
92			shift; shift
93		done
94	fi
95}
96
97add_new_resolv_conf() {
98	# XXX Old code did not create/update resolv.conf unless both
99	# $new_domain_name and $new_domain_name_servers were provided.  PR
100	# #3135 reported some ISPs only provide $new_domain_name_servers and
101	# thus broke the script. This code creates the resolv.conf if either
102	# are provided.
103
104	rm -f /etc/resolv.conf.std
105
106	if [ -n "$new_domain_name" ]; then
107		echo "search $new_domain_name" >>/etc/resolv.conf.std
108	fi
109
110	if [ -n "$new_domain_name_servers" ]; then
111		for nameserver in $new_domain_name_servers; do
112			echo "nameserver $nameserver" >>/etc/resolv.conf.std
113		done
114	fi
115
116	if [ -f /etc/resolv.conf.std ]; then
117		if [ -f /etc/resolv.conf.tail ]; then
118			cat /etc/resolv.conf.tail >>/etc/resolv.conf.std
119		fi
120
121		# In case (e.g. during OpenBSD installs) /etc/resolv.conf
122		# is a symbolic link, take care to preserve the link and write
123		# the new data in the correct location.
124
125		if [ -f /etc/resolv.conf ]; then
126			cat /etc/resolv.conf > /etc/resolv.conf.save
127		fi
128		cat /etc/resolv.conf.std > /etc/resolv.conf
129		rm -f /etc/resolv.conf.std
130
131		# Try to ensure correct ownership and permissions.
132		chown -RL root:wheel /etc/resolv.conf
133		chmod -RL 644 /etc/resolv.conf
134
135		return 0
136	fi
137
138	return 1
139}
140
141#
142# Start of active code.
143#
144
145case $reason in
146MEDIUM)
147	ifconfig $interface $medium
148	sleep 1
149	;;
150
151PREINIT)
152	delete_old_alias
153	ifconfig $interface up
154	;;
155
156ARPCHECK|ARPSEND)
157	;;
158
159BOUND|RENEW|REBIND|REBOOT)
160	if [ -n "$old_ip_address" ]; then
161		if [ "$old_ip_address" != "$alias_ip_address" ]; then
162			delete_old_alias
163		fi
164		if [ "$old_ip_address" != "$new_ip_address" ]; then
165			delete_old_address
166			delete_old_routes
167		fi
168	fi
169	if [ "$reason" = BOUND ] ||
170	   [ "$reason" = REBOOT ] ||
171	   [ -z "$old_ip_address" ] ||
172	   [ "$old_ip_address" != "$new_ip_address" ]; then
173		add_new_address
174		add_new_routes
175	fi
176	if [ "$new_ip_address" != "$alias_ip_address" ]; then
177		add_new_alias
178	fi
179	add_new_resolv_conf
180	;;
181
182EXPIRE|FAIL)
183	delete_old_alias
184	if [ -n "$old_ip_address" ]; then
185		delete_old_address
186		delete_old_routes
187	fi
188	# XXX Why add alias we just deleted above?
189	add_new_alias
190	if [ -f /etc/resolv.conf.save ]; then
191		cat /etc/resolv.conf.save > /etc/resolv.conf
192	fi
193	;;
194
195TIMEOUT)
196	delete_old_alias
197	add_new_address
198	sleep 1
199	if [ -n "$new_routers" ]; then
200		set "$new_routers"
201		if ping -q -c 1 -w 1 "$1"; then
202			if [ "$new_ip_address" != "$alias_ip_address" ]; then
203				add_new_alias
204			fi
205			add_new_routes
206			if add_new_resolv_conf; then
207				exit 0
208			fi
209		fi
210	fi
211	ifconfig $interface inet $new_ip_address delete $medium
212	# XXX Why not a delete_old_address as before all other invocations of
213	#     delete_old_routes?
214	delete_old_routes
215	exit 1
216	;;
217esac
218
219exit 0
220