ISC DHCP  4.4.1
A reference DHCPv4 and DHCPv6 implementation
site.h
Go to the documentation of this file.
1 /* Site-specific definitions.
2 
3  For supported systems, you shouldn't need to make any changes here.
4  However, you may want to, in order to deal with site-specific
5  differences. */
6 
7 /* Add any site-specific definitions and inclusions here... */
8 
9 /* #include <site-foo-bar.h> */
10 /* #define SITE_FOOBAR */
11 
12 /* Define this if you don't want dhcpd to run as a daemon and do want
13  to see all its output printed to stdout instead of being logged via
14  syslog(). This also makes dhcpd use the dhcpd.conf in its working
15  directory and write the dhcpd.leases file there. */
16 
17 /* #define DEBUG */
18 
19 /* Define this to see what the parser is parsing. You probably don't
20  want to see this. */
21 
22 /* #define DEBUG_TOKENS */
23 
24 /* Define this to see dumps of incoming and outgoing packets. This
25  slows things down quite a bit... */
26 
27 /* #define DEBUG_PACKET */
28 
29 /* Define this if you want to see dumps of expression evaluation. */
30 
31 /* #define DEBUG_EXPRESSIONS */
32 
33 /* Define this if you want to see dumps of find_lease() in action. */
34 
35 /* #define DEBUG_FIND_LEASE */
36 
37 /* Define this if you want to see dumps of parsed expressions. */
38 
39 /* #define DEBUG_EXPRESSION_PARSE */
40 
41 /* Define this if you want to watch the class matching process. */
42 
43 /* #define DEBUG_CLASS_MATCHING */
44 
45 /* Define this if you want to track memory usage for the purpose of
46  noticing memory leaks quickly. */
47 
48 /* #define DEBUG_MEMORY_LEAKAGE */
49 /* #define DEBUG_MEMORY_LEAKAGE_ON_EXIT */
50 
51 /* Define this if you want exhaustive (and very slow) checking of the
52  malloc pool for corruption. */
53 
54 /* #define DEBUG_MALLOC_POOL */
55 
56 /* Define this if you want to see a message every time a lease's state
57  changes. */
58 /* #define DEBUG_LEASE_STATE_TRANSITIONS */
59 
60 /* Define this if you want to maintain a history of the last N operations
61  that changed reference counts on objects. This can be used to debug
62  cases where an object is dereferenced too often, or not often enough. */
63 
64 /* #define DEBUG_RC_HISTORY */
65 
66 /* Define this if you want to see the history every cycle. */
67 
68 /* #define DEBUG_RC_HISTORY_EXHAUSTIVELY */
69 
70 /* This is the number of history entries to maintain - by default, 256. */
71 
72 /* #define RC_HISTORY_MAX 10240 */
73 
74 /* Define this if you want dhcpd to dump core when a non-fatal memory
75  allocation error is detected (i.e., something that would cause a
76  memory leak rather than a memory smash). */
77 
78 /* #define POINTER_DEBUG */
79 
80 /* Define this if you want debugging output for DHCP failover protocol
81  messages. */
82 
83 /* #define DEBUG_FAILOVER_MESSAGES */
84 
85 /* Define this to include contact messages in failover message debugging.
86  The contact messages are sent once per second, so this can generate a
87  lot of log entries. */
88 
89 /* #define DEBUG_FAILOVER_CONTACT_MESSAGES */
90 
91 /* Define this if you want debugging output for DHCP failover protocol
92  event timeout timing. */
93 
94 /* #define DEBUG_FAILOVER_TIMING */
95 
96 /* Define this if you want to include contact message timing, which is
97  performed once per second and can generate a lot of log entries. */
98 
99 /* #define DEBUG_FAILOVER_CONTACT_TIMING */
100 
101 /* Define this if you want all leases written to the lease file, even if
102  they are free leases that have never been used. */
103 
104 /* #define DEBUG_DUMP_ALL_LEASES */
105 
106 /* Define this if you want to see the requests and replies between the
107  DHCP code and the DNS library code. */
108 /* #define DEBUG_DNS_UPDATES */
109 
110 /* Define this if you want to debug the host part of the inform processing */
111 /* #define DEBUG_INFORM_HOST */
112 
113 /* Define this if you want to debug the binary leases (lease_chain) code */
114 /* #define DEBUG_BINARY_LEASES */
115 
116 /* Define this if you want to debug checksum calculations */
117 /* #define DEBUG_CHECKSUM */
118 
119 /* Define this if you want to verbosely debug checksum calculations */
120 /* #define DEBUG_CHECKSUM_VERBOSE */
121 
122 
123 /* Define this if you want DHCP failover protocol support in the DHCP
124  server. */
125 
126 /* #define FAILOVER_PROTOCOL */
127 
128 /* Define this if you want DNS update functionality to be available. */
129 
130 #define NSUPDATE
131 
132 /* Define this if you want to enable the DHCP server attempting to
133  find a nameserver to use for DDNS updates. */
134 #define DNS_ZONE_LOOKUP
135 
136 /* Define this if you want the dhcpd.pid file to go somewhere other than
137  the default (which varies from system to system, but is usually either
138  /etc or /var/run. */
139 
140 /* #define _PATH_DHCPD_PID "/var/run/dhcpd.pid" */
141 
142 /* Define this if you want the dhcpd.leases file (the dynamic lease database)
143  to go somewhere other than the default location, which is normally
144  /etc/dhcpd.leases. */
145 
146 /* #define _PATH_DHCPD_DB "/etc/dhcpd.leases" */
147 
148 /* Define this if you want the dhcpd.conf file to go somewhere other than
149  the default location. By default, it goes in /etc/dhcpd.conf. */
150 
151 /* #define _PATH_DHCPD_CONF "/etc/dhcpd.conf" */
152 
153 /* Network API definitions. You do not need to choose one of these - if
154  you don't choose, one will be chosen for you in your system's config
155  header. DON'T MESS WITH THIS UNLESS YOU KNOW WHAT YOU'RE DOING!!! */
156 
157 /* Define USE_SOCKETS to use the standard BSD socket API.
158 
159  On many systems, the BSD socket API does not provide the ability to
160  send packets to the 255.255.255.255 broadcast address, which can
161  prevent some clients (e.g., Win95) from seeing replies. This is
162  not a problem on Solaris.
163 
164  In addition, the BSD socket API will not work when more than one
165  network interface is configured on the server.
166 
167  However, the BSD socket API is about as efficient as you can get, so if
168  the aforementioned problems do not matter to you, or if no other
169  API is supported for your system, you may want to go with it. */
170 
171 /* #define USE_SOCKETS */
172 
173 /* Define this to use the Sun Streams NIT API.
174 
175  The Sun Streams NIT API is only supported on SunOS 4.x releases. */
176 
177 /* #define USE_NIT */
178 
179 /* Define this to use the Berkeley Packet Filter API.
180 
181  The BPF API is available on all 4.4-BSD derivatives, including
182  NetBSD, FreeBSD and BSDI's BSD/OS. It's also available on
183  DEC Alpha OSF/1 in a compatibility mode supported by the Alpha OSF/1
184  packetfilter interface. */
185 
186 /* #define USE_BPF */
187 
188 /* Define this to use the raw socket API.
189 
190  The raw socket API is provided on many BSD derivatives, and provides
191  a way to send out raw IP packets. It is only supported for sending
192  packets - packets must be received with the regular socket API.
193  This code is experimental - I've never gotten it to actually transmit
194  a packet to the 255.255.255.255 broadcast address - so use it at your
195  own risk. */
196 
197 /* #define USE_RAW_SOCKETS */
198 
199 /* Define this to keep the old program name (e.g., "dhcpd" for
200  the DHCP server) in place of the (base) name the program was
201  invoked with. */
202 
203 /* #define OLD_LOG_NAME */
204 
205 /* Define this to change the logging facility used by dhcpd. */
206 
207 /* #define DHCPD_LOG_FACILITY LOG_DAEMON */
208 
209 
210 /* Define this if you want to be able to execute external commands
211  during conditional evaluation. */
212 
213 /* #define ENABLE_EXECUTE */
214 
215 /* Define this if you aren't debugging and you want to save memory
216  (potentially a _lot_ of memory) by allocating leases in chunks rather
217  than one at a time. */
218 
219 #define COMPACT_LEASES
220 
221 /* Define this if you want to be able to save and playback server operational
222  traces. */
223 
224 /* #define TRACING */
225 
226 /* Define this if you want the server to use the previous behavior
227  when determining the DDNS TTL. If the user has specified a ddns-ttl
228  option that is used to detemine the ttl. (If the user specifies
229  an option that references the lease structure it is only usable
230  for v4. In that case v6 will use the default.) Otherwise when
231  defined the defaults are: v4 - 1/2 the lease time,
232  v6 - DEFAULT_DDNS_TTL. When undefined the defaults are 1/2 the
233  (preferred) lease time for both but with a cap on the maximum. */
234 
235 /* #define USE_OLD_DDNS_TTL */
236 
237 /* Define this if you want a DHCPv6 server to send replies to the
238  source port of the message it received. This is useful for testing
239  but is only included for backwards compatibility. */
240 /* #define REPLY_TO_SOURCE_PORT */
241 
242 /* Define this if you want to enable strict checks in DNS Updates mechanism.
243  Do not enable this unless are DHCP developer. */
244 /* #define DNS_UPDATES_MEMORY_CHECKS */
245 
246 /* Define this if you want to allow domain list in domain-name option.
247  RFC2132 does not allow that behavior, but it is somewhat used due
248  to historic reasons. Note that it may be removed some time in the
249  future. */
250 
251 #define ACCEPT_LIST_IN_DOMAIN_NAME
252 
253 /* In previous versions of the code when the server generates a NAK
254  it doesn't attempt to determine if the configuration included a
255  server ID for that client. Defining this option causes the server
256  to make a modest effort to determine the server id when building
257  a NAK as a response. This effort will only check the first subnet
258  and pool associated with a shared subnet and will not check for
259  host declarations. With some configurations the server id
260  computed for a NAK may not match that computed for an ACK. */
261 
262 #define SERVER_ID_FOR_NAK
263 
264 /* NOTE: SERVER_ID_CHECK switch has been removed. Enabling server id
265  * checking is now done via the server-id-check statement. Please refer
266  * to the dhcpd manpage (server/dhcpd.conf.5) */
267 
268 /* Include code to do a slow transition of DDNS records
269  from the interim to the standard version, or backwards.
270  The normal code will handle removing an old style record
271  when the name on a lease is being changed. This adds code
272  to handle the case where the name isn't being changed but
273  the old record should be removed to allow a new record to
274  be added. This is the slow transition as leases are only
275  updated as a client touches them. A fast transition would
276  entail updating all the records at once, probably at start
277  up. */
278 #define DDNS_UPDATE_SLOW_TRANSITION
279 
280 /* Define the default prefix length passed from the client to
281  the script when modifying an IPv6 IA_NA or IA_TA address.
282  The two most useful values are 128 which is what the current
283  specifications call for or 64 which is what has been used in
284  the past. For most OSes 128 will indicate that the address
285  is a host address and doesn't include any on-link information.
286  64 indicates that the first 64 bits are the subnet or on-link
287  prefix. */
288 #define DHCLIENT_DEFAULT_PREFIX_LEN 128
289 
290 /* Enable the gentle shutdown signal handling. Currently this
291  means that on SIGINT or SIGTERM a client will release its
292  address and a server in a failover pair will go through
293  partner down. Both of which can be undesireable in some
294  situations. We plan to revisit this feature and may
295  make non-backwards compatible changes including the
296  removal of this define. Use at your own risk. */
297 /* #define ENABLE_GENTLE_SHUTDOWN */
298 
299 /* Include old error codes. This is provided in case you
300  are building an external program similar to omshell for
301  which you need the ISC_R_* error codes. You should switch
302  to DHCP_R_* error codes for those that have been defined
303  (see includes/omapip/result.h). The extra defines and
304  this option will be removed at some time. */
305 /* #define INCLUDE_OLD_DHCP_ISC_ERROR_CODES */
306 
307 /* Use the older factors for scoring a lease in the v6 client code.
308  The new factors cause the client to choose more bindings (IAs)
309  over more addresse within a binding. Most uses will get a
310  single address in a single binding and only get an adverstise
311  from a single server and there won't be a difference. */
312 /* #define USE_ORIGINAL_CLIENT_LEASE_WEIGHTS */
313 
314 /* Print out specific error messages for dhclient, dhcpd
315  or dhcrelay when processing an incorrect command line. This
316  is included for those that might require the exact error
317  messages, as we don't expect that is necessary it is on by
318  default. */
319 #define PRINT_SPECIFIC_CL_ERRORS
320 
321 /* Limit the value of a file descriptor the serve will use
322  when accepting a connecting request. This can be used to
323  limit the number of TCP connections that the server will
324  allow at one time. A value of 0 means there is no limit.*/
325 #define MAX_FD_VALUE 200
326 
327 /* Enable EUI-64 Address assignment policy. Instructs the server
328  * to use EUI-64 addressing instead of dynamic address allocation
329  * for IA_NA pools, if the parameter use-eui-64 is true for the
330  * pool. Can be at all scopes down to the pool level. Not
331  * supported by the configure script. */
332 /* #define EUI_64 */
333 
334 /* Enable enforcement of the require option statement as documented
335  * in man page. Instructs the dhclient, when in -6 mode, to discard
336  * offered leases that do not contain all options specified as required
337  * in the client's configuration file. The client already enforces this
338  * in -4 mode. */
339 #define ENFORCE_DHCPV6_CLIENT_REQUIRE
340 
341 /* Enable the invocation of the client script with a FAIL state code
342  * by dhclient when running in one-try mode (-T) and the attempt to
343  * obtain the desired lease(s) fails. Applies to IPv4 mode only. */
344 /* #define CALL_SCRIPT_ON_ONETRY_FAIL */
345 
346 /* Include definitions for various options. In general these
347  should be left as is, but if you have already defined one
348  of these and prefer your definition you can comment the
349  RFC define out to avoid conflicts */
350 #define RFC2563_OPTIONS
351 #define RFC2937_OPTIONS
352 #define RFC4776_OPTIONS
353 #define RFC4578_OPTIONS
354 #define RFC4833_OPTIONS
355 #define RFC4994_OPTIONS
356 #define RFC5071_OPTIONS
357 #define RFC5192_OPTIONS
358 #define RFC5223_OPTIONS
359 #define RFC5417_OPTIONS
360 #define RFC5460_OPTIONS
361 #define RFC5859_OPTIONS
362 #define RFC5969_OPTIONS
363 #define RFC5970_OPTIONS
364 #define RFC5986_OPTIONS
365 #define RFC6011_OPTIONS
366 #define RFC6011_OPTIONS
367 #define RFC6153_OPTIONS
368 #define RFC6334_OPTIONS
369 #define RFC6440_OPTIONS
370 #define RFC6731_OPTIONS
371 #define RFC6939_OPTIONS
372 #define RFC6977_OPTIONS
373 #define RFC7083_OPTIONS
374 #define RFC7341_OPTIONS
375 #define RFC7618_OPTIONS
376 #define RFC7710_OPTIONS