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aba5acdf SH |
1 | #!/bin/bash |
2 | # | |
3 | # dhclient-script for Linux. | |
4 | # | |
5 | # This program is free software; you can redistribute it and/or | |
6 | # modify it under the terms of the GNU General Public License | |
7 | # as published by the Free Software Foundation; either version | |
8 | # 2 of the License, or (at your option) any later version. | |
9 | # | |
10 | # Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
11 | # | |
12 | # Probably, I did not understand, what this funny feature as "alias" | |
13 | # means exactly. For now I suppose, that it is a static address, which | |
14 | # we should install and preserve. | |
15 | # | |
16 | ||
20ed7b24 | 17 | exec >> /var/log/DHS.log 2>&1 |
aba5acdf SH |
18 | |
19 | echo dhc-script $* reason=$reason | |
20 | set | grep "^\(old_\|new_\|check_\)" | |
21 | ||
22 | LOG () { | |
23 | echo LOG $* ; | |
24 | } | |
25 | ||
26 | # convert 8bit mask to length | |
27 | # arg: $1 = mask | |
28 | # | |
29 | Mask8ToLen() { | |
30 | local l=0; | |
31 | ||
32 | while [ $l -le 7 ]; do | |
33 | if [ $[ ( 1 << $l ) + $1 ] -eq 256 ]; then | |
34 | return $[ 8 - $l ] | |
35 | fi | |
36 | l=$[ $l + 1 ] | |
37 | done | |
38 | return 0; | |
39 | } | |
40 | ||
41 | # convert inet dotted quad mask to length | |
42 | # arg: $1 = dotquad mask | |
43 | # | |
44 | MaskToLen() { | |
45 | local masklen=0 | |
46 | local mask8=$1 | |
47 | ||
48 | case $1 in | |
49 | 0.0.0.0) | |
50 | return 0; | |
51 | ;; | |
52 | 255.*.0.0) | |
53 | masklen=8 | |
54 | mask8=${mask8#255.} | |
55 | mask8=${mask8%.0.0} | |
56 | ;; | |
57 | 255.255.*.0) | |
58 | masklen=16 | |
59 | mask8=${mask8#255.255.} | |
60 | mask8=${mask8%.0} | |
61 | ;; | |
62 | 255.255.255.*) | |
63 | masklen=24 | |
64 | mask8=${mask8#255.255.255.} | |
65 | ;; | |
66 | *) | |
67 | return 255 | |
68 | ;; | |
69 | esac | |
70 | Mask8ToLen $mask8 | |
71 | return $[ $? + $masklen ] | |
72 | } | |
73 | ||
74 | # calculate ABC "natural" mask | |
75 | # arg: $1 = dotquad address | |
76 | # | |
77 | ABCMask () { | |
78 | local class; | |
79 | ||
80 | class=${1%%.*} | |
81 | ||
82 | if [ "$1" = "255.255.255.255" ]; then | |
83 | echo $1 | |
84 | elif [ "$1" = "0.0.0.0" ]; then | |
85 | echo $1 | |
86 | elif [ $class -ge 224 ]; then | |
87 | echo 240.0.0.0 | |
88 | elif [ $class -ge 192 ]; then | |
89 | echo 255.255.255.0 | |
90 | elif [ $class -ge 128 ]; then | |
91 | echo 255.255.0.0 | |
92 | else | |
93 | echo 255.0.0.0 | |
94 | fi | |
95 | } | |
96 | ||
97 | # calculate ABC "natural" mask length | |
98 | # arg: $1 = dotquad address | |
99 | # | |
100 | ABCMaskLen () { | |
101 | local class; | |
102 | ||
103 | class=${1%%.*} | |
104 | ||
105 | if [ "$1" = "255.255.255.255" ]; then | |
106 | return 32 | |
107 | elif [ "$1" = "0.0.0.0" ]; then | |
108 | return 0 | |
109 | elif [ $class -ge 224 ]; then | |
110 | return 4; | |
111 | elif [ $class -ge 192 ]; then | |
112 | return 24; | |
113 | elif [ $class -ge 128 ]; then | |
114 | return 16; | |
115 | else | |
116 | return 8; | |
117 | fi | |
118 | } | |
119 | ||
120 | # Delete IP address | |
121 | # args: $1 = interface | |
122 | # $2 = address | |
123 | # $3 = mask | |
124 | # $4 = broadcast | |
125 | # $5 = label | |
126 | # | |
127 | DelINETAddr () { | |
128 | local masklen=32 | |
129 | local addrid=$1 | |
130 | ||
131 | LOG DelINETAddr $* | |
132 | ||
133 | if [ "$5" ]; then | |
134 | addrid=$addrid:$5 | |
135 | fi | |
136 | LOG ifconfig $addrid down | |
137 | ifconfig $addrid down | |
138 | } | |
139 | ||
140 | # Add IP address | |
141 | # args: $1 = interface | |
142 | # $2 = address | |
143 | # $3 = mask | |
144 | # $4 = broadcast | |
145 | # $5 = label | |
146 | # | |
147 | AddINETAddr () { | |
148 | local mask_arg | |
149 | local brd_arg | |
150 | local addrid=$1 | |
151 | ||
152 | LOG AddINETAddr $* | |
153 | ||
154 | if [ "$5" ]; then | |
155 | addrid=$addrid:$5 | |
156 | fi | |
157 | if [ "$3" ]; then | |
158 | mask_arg="netmask $3" | |
159 | fi | |
160 | if [ "$4" ]; then | |
161 | brd_arg="broadcast $4" | |
162 | fi | |
163 | ||
164 | LOG ifconfig $addrid $2 $mask_arg $brd_arg up | |
165 | ifconfig $addrid $2 $mask_arg $brd_arg up | |
166 | } | |
167 | ||
168 | # Add default routes | |
169 | # args: $1 = routers list | |
170 | # | |
171 | AddDefaultRoutes() { | |
172 | local router | |
173 | ||
174 | if [ "$1" ]; then | |
175 | LOG AddDefaultRoutes $* | |
176 | for router in $1; do | |
177 | LOG route add default gw $router | |
178 | route add default gw $router | |
179 | done ; | |
180 | fi | |
181 | } | |
182 | ||
183 | # Delete default routes | |
184 | # args: $1 = routers list | |
185 | # | |
186 | DelDefaultRoutes() { | |
187 | local router | |
188 | ||
189 | if [ "$1" ]; then | |
190 | LOG DelDefaultRoutes $* | |
191 | ||
192 | for router in $1; do | |
193 | LOG route del default gw $router | |
194 | route del default gw $router | |
195 | done | |
196 | fi | |
197 | } | |
198 | ||
199 | # ping a host | |
200 | # args: $1 = dotquad address of the host | |
201 | # | |
202 | PingNode() { | |
203 | LOG PingNode $* | |
204 | if ping -q -c 1 -w 2 $1 ; then | |
205 | return 0; | |
206 | fi | |
207 | return 1; | |
208 | } | |
209 | ||
210 | # Check (and add route, if alive) default routers | |
211 | # args: $1 = routers list | |
212 | # returns: 0 if at least one router is alive. | |
213 | # | |
214 | CheckRouterList() { | |
215 | local router | |
216 | local succeed=1 | |
217 | ||
218 | LOG CheckRouterList $* | |
219 | ||
220 | for router in $1; do | |
221 | if PingNode $router ; then | |
222 | succeed=0 | |
223 | route add default gw $router | |
224 | fi | |
225 | done | |
226 | return $succeed | |
227 | } | |
228 | ||
229 | # Delete/create static routes. | |
230 | # args: $1 = operation (del/add) | |
231 | # $2 = routes list in format "dst1 nexthop1 dst2 ..." | |
232 | # | |
233 | # BEWARE: this feature of DHCP is obsolete, because does not | |
234 | # support subnetting. | |
235 | # | |
236 | X-StaticRouteList() { | |
237 | local op=$1 | |
238 | local lst="$2" | |
239 | local masklen | |
240 | ||
241 | LOG X-StaticRouteList $* | |
242 | ||
243 | if [ "$lst" ]; then | |
244 | set $lst | |
245 | while [ $# -gt 1 ]; do | |
246 | route $op -net $1 netmask `ABCMask "$1"` gw $2 | |
247 | shift; shift; | |
248 | done | |
249 | fi | |
250 | } | |
251 | ||
252 | # Create static routes. | |
253 | # arg: $1 = routes list in format "dst1 nexthop1 dst2 ..." | |
254 | # | |
255 | AddStaticRouteList() { | |
256 | LOG AddStaticRouteList $* | |
257 | X-StaticRouteList add "$1" | |
258 | } | |
259 | ||
260 | # Delete static routes. | |
261 | # arg: $1 = routes list in format "dst1 nexthop1 dst2 ..." | |
262 | # | |
263 | DelStaticRouteList() { | |
264 | LOG DelStaticRouteList $* | |
265 | X-StaticRouteList del "$1" | |
266 | } | |
267 | ||
268 | # Broadcast unsolicited ARP to update neighbours' caches. | |
269 | # args: $1 = interface | |
270 | # $2 = address | |
271 | # | |
272 | UnsolicitedARP() { | |
273 | if [ -f /sbin/arping ]; then | |
274 | /sbin/arping -A -c 1 -I "$1" "$2" & | |
275 | (sleep 2 ; /sbin/arping -U -c 1 -I "$1" "$2" ) & | |
276 | fi | |
277 | } | |
278 | ||
279 | # Duplicate address detection. | |
280 | # args: $1 = interface | |
281 | # $2 = test address | |
282 | # returns: 0, if DAD succeeded. | |
283 | DAD() { | |
284 | if [ -f /sbin/arping ]; then | |
285 | /sbin/arping -c 2 -w 3 -D -I "$1" "$2" | |
286 | return $? | |
287 | fi | |
288 | return 0 | |
289 | } | |
290 | ||
291 | ||
292 | # Setup resolver. | |
293 | # args: NO | |
294 | # domain and nameserver list are passed in global variables. | |
295 | # | |
296 | # NOTE: we try to be careful and not to break user supplied resolv.conf. | |
297 | # The script mangles it, only if it has dhcp magic signature. | |
298 | # | |
299 | UpdateDNS() { | |
300 | local nameserver | |
301 | local idstring="#### Generated by DHCPCD" | |
302 | ||
303 | LOG UpdateDNS $* | |
304 | ||
305 | if [ "$new_domain_name" = "" -a "$new_domain_name_servers" = "" ]; then | |
306 | return 0; | |
307 | fi | |
308 | ||
309 | echo $idstring > /etc/resolv.conf.dhcp | |
310 | if [ "$new_domain_name" ]; then | |
311 | echo search $new_domain_name >> /etc/resolv.conf.dhcp | |
312 | fi | |
313 | echo options ndots:1 >> /etc/resolv.conf.dhcp | |
314 | ||
315 | if [ "$new_domain_name_servers" ]; then | |
316 | for nameserver in $new_domain_name_servers; do | |
317 | echo nameserver $nameserver >> /etc/resolv.conf.dhcp | |
318 | done | |
319 | else | |
320 | echo nameserver 127.0.0.1 >> /etc/resolv.conf.dhcp | |
321 | fi | |
322 | ||
323 | if [ -f /etc/resolv.conf ]; then | |
324 | if [ "`head -1 /etc/resolv.conf`" != "$idstring" ]; then | |
325 | return 0 | |
326 | fi | |
327 | if [ "$old_domain_name" = "$new_domain_name" -a | |
328 | "$new_domain_name_servers" = "$old_domain_name_servers" ]; then | |
329 | return 0 | |
330 | fi | |
331 | fi | |
332 | mv /etc/resolv.conf.dhcp /etc/resolv.conf | |
333 | } | |
334 | ||
335 | case $reason in | |
336 | NBI) | |
337 | exit 1 | |
338 | ;; | |
339 | ||
340 | MEDIUM) | |
341 | exit 0 | |
342 | ;; | |
343 | ||
344 | PREINIT) | |
345 | ifconfig $interface:dhcp down | |
346 | ifconfig $interface:dhcp1 down | |
347 | if [ -d /proc/sys/net/ipv4/conf/$interface ]; then | |
348 | ifconfig $interface:dhcp 10.10.10.10 netmask 255.255.255.255 | |
349 | ifconfig $interface:dhcp down | |
350 | if [ -d /proc/sys/net/ipv4/conf/$interface ]; then | |
351 | LOG The interface $interface already configured. | |
352 | fi | |
353 | fi | |
354 | ifconfig $interface:dhcp up | |
355 | exit 0 | |
356 | ;; | |
357 | ||
358 | ARPSEND) | |
359 | exit 0 | |
360 | ;; | |
361 | ||
362 | ARPCHECK) | |
363 | if DAD "$interface" "$check_ip_address" ; then | |
364 | exit 0 | |
365 | fi | |
366 | exit 1 | |
367 | ;; | |
368 | ||
369 | BOUND|RENEW|REBIND|REBOOT) | |
370 | if [ "$old_ip_address" -a "$alias_ip_address" -a \ | |
371 | "$alias_ip_address" != "$old_ip_address" ]; then | |
372 | DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
373 | fi | |
374 | if [ "$old_ip_address" -a "$old_ip_address" != "$new_ip_address" ]; then | |
375 | DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp | |
376 | DelDefaultRoutes "$old_routers" | |
377 | DelStaticRouteList "$old_static_routes" | |
378 | fi | |
379 | if [ "$old_ip_address" = "" -o "$old_ip_address" != "$new_ip_address" -o \ | |
380 | "$reason" = "BOUND" -o "$reason" = "REBOOT" ]; then | |
381 | AddINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp | |
382 | AddStaticRouteList "$new_static_routes" | |
383 | AddDefaultRoutes "$new_routers" | |
384 | UnsolicitedARP "$interface" "$new_ip_address" | |
385 | fi | |
386 | if [ "$new_ip_address" != "$alias_ip_address" -a "$alias_ip_address" ]; then | |
387 | AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
388 | fi | |
389 | UpdateDNS | |
390 | exit 0 | |
391 | ;; | |
392 | ||
393 | EXPIRE|FAIL) | |
394 | if [ "$alias_ip_address" ]; then | |
395 | DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
396 | fi | |
397 | if [ "$old_ip_address" ]; then | |
398 | DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp | |
399 | DelDefaultRoutes "$old_routers" | |
400 | DelStaticRouteList "$old_static_routes" | |
401 | fi | |
402 | if [ "$alias_ip_address" ]; then | |
403 | AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
404 | fi | |
405 | exit 0 | |
406 | ;; | |
407 | ||
408 | TIMEOUT) | |
409 | if [ "$alias_ip_address" ]; then | |
410 | DelINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
411 | fi | |
412 | # Seems, <null address> means, that no more old leases found. | |
413 | # Or does it mean bug in dhcpcd? 8) Fail for now. | |
414 | if [ "$new_ip_address" = "<null address>" ]; then | |
415 | if [ "$old_ip_address" ]; then | |
416 | DelINETAddr "$interface" "$old_ip_address" "$old_subnet_mask" "$old_broadcast_address" dhcp | |
417 | fi | |
418 | if [ "$alias_ip_address" ]; then | |
419 | AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
420 | fi | |
421 | exit 1 | |
422 | fi | |
423 | if DAD "$interface" "$new_ip_address" ; then | |
424 | AddINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp | |
425 | UnsolicitedARP "$interface" "$new_ip_address" | |
426 | if [ "$alias_ip_address" -a "$alias_ip_address" != "$new_ip_address" ]; then | |
427 | AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
428 | UnsolicitedARP "$interface" "$alias_ip_address" | |
429 | fi | |
430 | if CheckRouterList "$new_routers" ; then | |
431 | AddStaticRouteList "$new_static_routes" | |
432 | UpdateDNS | |
433 | exit 0 | |
434 | fi | |
435 | fi | |
436 | DelINETAddr "$interface" "$new_ip_address" "$new_subnet_mask" "$new_broadcast_address" dhcp | |
437 | DelDefaultRoutes "$old_routers" | |
438 | DelStaticRouteList "$old_static_routes" | |
439 | if [ "$alias_ip_address" ]; then | |
440 | AddINETAddr "$interface" "$alias_ip_address" "$alias_subnet_mask" "$alias_broadcast_address" dhcp1 | |
441 | fi | |
442 | exit 1 | |
443 | ;; | |
444 | esac | |
445 | ||
446 | exit 0 |