Annotation of embedaddon/dhcp/client/scripts/linux, revision 1.1.1.1
1.1 misho 1: #!/bin/bash
2: # dhclient-script for Linux. Dan Halbert, March, 1997.
3: # Updated for Linux 2.[12] by Brian J. Murrell, January 1999.
4: # No guarantees about this. I'm a novice at the details of Linux
5: # networking.
6:
7: # Notes:
8:
9: # 0. This script is based on the netbsd script supplied with dhcp-970306.
10:
11: # 1. ifconfig down apparently deletes all relevant routes and flushes
12: # the arp cache, so this doesn't need to be done explicitly.
13:
14: # 2. The alias address handling here has not been tested AT ALL.
15: # I'm just going by the doc of modern Linux ip aliasing, which uses
16: # notations like eth0:0, eth0:1, for each alias.
17:
18: # 3. I have to calculate the network address, and calculate the broadcast
19: # address if it is not supplied. This might be much more easily done
20: # by the dhclient C code, and passed on.
21:
22: # 4. TIMEOUT not tested. ping has a flag I don't know, and I'm suspicious
23: # of the $1 in its args.
24:
25: # 'ip' just looks too weird. /sbin/ip looks less weird.
26: ip=/sbin/ip
27:
28: make_resolv_conf() {
29: if [ x"$new_domain_name_servers" != x ]; then
30: cat /dev/null > /etc/resolv.conf.dhclient
31: chmod 644 /etc/resolv.conf.dhclient
32: if [ x"$new_domain_search" != x ]; then
33: echo search $new_domain_search >> /etc/resolv.conf.dhclient
34: elif [ x"$new_domain_name" != x ]; then
35: # Note that the DHCP 'Domain Name Option' is really just a domain
36: # name, and that this practice of using the domain name option as
37: # a search path is both nonstandard and deprecated.
38: echo search $new_domain_name >> /etc/resolv.conf.dhclient
39: fi
40: for nameserver in $new_domain_name_servers; do
41: echo nameserver $nameserver >>/etc/resolv.conf.dhclient
42: done
43:
44: mv /etc/resolv.conf.dhclient /etc/resolv.conf
45: elif [ "x${new_dhcp6_name_servers}" != x ] ; then
46: cat /dev/null > /etc/resolv.conf.dhclient6
47: chmod 644 /etc/resolv.conf.dhclient6
48:
49: if [ "x${new_dhcp6_domain_search}" != x ] ; then
50: echo search ${new_dhcp6_domain_search} >> /etc/resolv.conf.dhclient6
51: fi
52: shopt -s nocasematch
53: for nameserver in ${new_dhcp6_name_servers} ; do
54: # If the nameserver has a link-local address
55: # add a <zone_id> (interface name) to it.
56: if [[ "$nameserver" =~ ^fe80:: ]]
57: then
58: zone_id="%$interface"
59: else
60: zone_id=
61: fi
62: echo nameserver ${nameserver}$zone_id >> /etc/resolv.conf.dhclient6
63: done
64: shopt -u nocasematch
65:
66: mv /etc/resolv.conf.dhclient6 /etc/resolv.conf
67: fi
68: }
69:
70: # Must be used on exit. Invokes the local dhcp client exit hooks, if any.
71: exit_with_hooks() {
72: exit_status=$1
73: if [ -f /etc/dhclient-exit-hooks ]; then
74: . /etc/dhclient-exit-hooks
75: fi
76: # probably should do something with exit status of the local script
77: exit $exit_status
78: }
79:
80: # Invoke the local dhcp client enter hooks, if they exist.
81: if [ -f /etc/dhclient-enter-hooks ]; then
82: exit_status=0
83: . /etc/dhclient-enter-hooks
84: # allow the local script to abort processing of this state
85: # local script must set exit_status variable to nonzero.
86: if [ $exit_status -ne 0 ]; then
87: exit $exit_status
88: fi
89: fi
90:
91: ###
92: ### DHCPv4 Handlers
93: ###
94:
95: if [ x$new_broadcast_address != x ]; then
96: new_broadcast_arg="broadcast $new_broadcast_address"
97: fi
98: if [ x$old_broadcast_address != x ]; then
99: old_broadcast_arg="broadcast $old_broadcast_address"
100: fi
101: if [ x$new_subnet_mask != x ]; then
102: new_subnet_arg="netmask $new_subnet_mask"
103: fi
104: if [ x$old_subnet_mask != x ]; then
105: old_subnet_arg="netmask $old_subnet_mask"
106: fi
107: if [ x$alias_subnet_mask != x ]; then
108: alias_subnet_arg="netmask $alias_subnet_mask"
109: fi
110: if [ x$new_interface_mtu != x ]; then
111: mtu_arg="mtu $new_interface_mtu"
112: fi
113: if [ x$IF_METRIC != x ]; then
114: metric_arg="metric $IF_METRIC"
115: fi
116:
117: if [ x$reason = xMEDIUM ]; then
118: # Linux doesn't do mediums (ok, ok, media).
119: exit_with_hooks 0
120: fi
121:
122: if [ x$reason = xPREINIT ]; then
123: if [ x$alias_ip_address != x ]; then
124: # Bring down alias interface. Its routes will disappear too.
125: ifconfig $interface:0- inet 0
126: fi
127: ifconfig $interface 0 up
128:
129: # We need to give the kernel some time to get the interface up.
130: sleep 1
131:
132: exit_with_hooks 0
133: fi
134:
135: if [ x$reason = xARPCHECK ] || [ x$reason = xARPSEND ]; then
136: exit_with_hooks 0
137: fi
138:
139: if [ x$reason = xBOUND ] || [ x$reason = xRENEW ] || \
140: [ x$reason = xREBIND ] || [ x$reason = xREBOOT ]; then
141: current_hostname=`hostname`
142: if [ x$current_hostname = x ] || \
143: [ x$current_hostname = "x(none)" ] || \
144: [ x$current_hostname = xlocalhost ] || \
145: [ x$current_hostname = x$old_host_name ]; then
146: if [ x$new_host_name != x$old_host_name ]; then
147: hostname "$new_host_name"
148: fi
149: fi
150:
151: if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
152: [ x$alias_ip_address != x$old_ip_address ]; then
153: # Possible new alias. Remove old alias.
154: ifconfig $interface:0- inet 0
155: fi
156: if [ x$old_ip_address != x ] && [ x$old_ip_address != x$new_ip_address ]; then
157: # IP address changed. Bringing down the interface will delete all routes,
158: # and clear the ARP cache.
159: ifconfig $interface inet 0 down
160:
161: fi
162: if [ x$old_ip_address = x ] || [ x$old_ip_address != x$new_ip_address ] || \
163: [ x$reason = xBOUND ] || [ x$reason = xREBOOT ]; then
164:
165: ifconfig $interface inet $new_ip_address $new_subnet_arg \
166: $new_broadcast_arg $mtu_arg
167: # Add a network route to the computed network address.
168: for router in $new_routers; do
169: if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
170: route add -host $router dev $interface
171: fi
172: route add default gw $router $metric_arg dev $interface
173: done
174: else
175: # we haven't changed the address, have we changed other options
176: # that we wish to update?
177: if [ x$new_routers != x ] && [ x$new_routers != x$old_routers ] ; then
178: # if we've changed routers delete the old and add the new.
179: for router in $old_routers; do
180: route del default gw $router
181: done
182: for router in $new_routers; do
183: if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
184: route add -host $router dev $interface
185: fi
186: route add default gw $router $metric_arg dev $interface
187: done
188: fi
189: fi
190: if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ];
191: then
192: ifconfig $interface:0- inet 0
193: ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
194: route add -host $alias_ip_address $interface:0
195: fi
196: make_resolv_conf
197: exit_with_hooks 0
198: fi
199:
200: if [ x$reason = xEXPIRE ] || [ x$reason = xFAIL ] || [ x$reason = xRELEASE ] \
201: || [ x$reason = xSTOP ]; then
202: if [ x$alias_ip_address != x ]; then
203: # Turn off alias interface.
204: ifconfig $interface:0- inet 0
205: fi
206: if [ x$old_ip_address != x ]; then
207: # Shut down interface, which will delete routes and clear arp cache.
208: ifconfig $interface inet 0 down
209: fi
210: if [ x$alias_ip_address != x ]; then
211: ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
212: route add -host $alias_ip_address $interface:0
213: fi
214: exit_with_hooks 0
215: fi
216:
217: if [ x$reason = xTIMEOUT ]; then
218: if [ x$alias_ip_address != x ]; then
219: ifconfig $interface:0- inet 0
220: fi
221: ifconfig $interface inet $new_ip_address $new_subnet_arg \
222: $new_broadcast_arg $mtu_arg
223: set $new_routers
224: if ping -q -c 1 $1; then
225: if [ x$new_ip_address != x$alias_ip_address ] && \
226: [ x$alias_ip_address != x ]; then
227: ifconfig $interface:0 inet $alias_ip_address $alias_subnet_arg
228: route add -host $alias_ip_address dev $interface:0
229: fi
230: for router in $new_routers; do
231: if [ "x$new_subnet_mask" = "x255.255.255.255" ] ; then
232: route add -host $router dev $interface
233: fi
234: route add default gw $router $metric_arg dev $interface
235: done
236: make_resolv_conf
237: exit_with_hooks 0
238: fi
239: ifconfig $interface inet 0 down
240: exit_with_hooks 1
241: fi
242:
243: ###
244: ### DHCPv6 Handlers
245: ###
246:
247: if [ x$reason = xPREINIT6 ] ; then
248: # Ensure interface is up.
249: ${ip} link set ${interface} up
250:
251: # Remove any stale addresses from aborted clients.
252: ${ip} -f inet6 addr flush dev ${interface} scope global permanent
253:
254: exit_with_hooks 0
255: fi
256:
257: if [ x${old_ip6_prefix} != x ] || [ x${new_ip6_prefix} != x ] ; then
258: echo Prefix ${reason} old=${old_ip6_prefix} new=${new_ip6_prefix}
259:
260: exit_with_hooks 0
261: fi
262:
263: if [ x$reason = xBOUND6 ] ; then
264: if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
265: exit_with_hooks 2;
266: fi
267:
268: ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
269: dev ${interface} scope global
270:
271: # Check for nameserver options.
272: make_resolv_conf
273:
274: exit_with_hooks 0
275: fi
276:
277: if [ x$reason = xRENEW6 ] || [ x$reason = xREBIND6 ] ; then
278: if [ x${new_ip6_address} = x ] || [ x${new_ip6_prefixlen} = x ] ; then
279: exit_with_hooks 2;
280: fi
281:
282: ${ip} -f inet6 addr add ${new_ip6_address}/${new_ip6_prefixlen} \
283: dev ${interface} scope global
284:
285: # Make sure nothing has moved around on us.
286:
287: # Nameservers/domains/etc.
288: if [ "x${new_dhcp6_name_servers}" != "x${old_dhcp6_name_servers}" ] ||
289: [ "x${new_dhcp6_domain_search}" != "x${old_dhcp6_domain_search}" ] ; then
290: make_resolv_conf
291: fi
292:
293: exit_with_hooks 0
294: fi
295:
296: if [ x$reason = xDEPREF6 ] ; then
297: if [ x${new_ip6_prefixlen} = x ] ; then
298: exit_with_hooks 2;
299: fi
300:
301: ${ip} -f inet6 addr change ${new_ip6_address}/${new_ip6_prefixlen} \
302: dev ${interface} scope global preferred_lft 0
303:
304: exit_with_hooks 0
305: fi
306:
307: if [ x$reason = xEXPIRE6 -o x$reason = xRELEASE6 -o x$reason = xSTOP6 ] ; then
308: if [ x${old_ip6_address} = x ] || [ x${old_ip6_prefixlen} = x ] ; then
309: exit_with_hooks 2;
310: fi
311:
312: ${ip} -f inet6 addr del ${old_ip6_address}/${old_ip6_prefixlen} \
313: dev ${interface}
314:
315: exit_with_hooks 0
316: fi
317:
318: exit_with_hooks 0
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