ISC DHCP
4.3.6
A reference DHCPv4 and DHCPv6 implementation
site.h
Go to the documentation of this file.
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/* Site-specific definitions.
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For supported systems, you shouldn't need to make any changes here.
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However, you may want to, in order to deal with site-specific
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differences. */
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/* Add any site-specific definitions and inclusions here... */
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/* #include <site-foo-bar.h> */
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/* #define SITE_FOOBAR */
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/* Define this if you don't want dhcpd to run as a daemon and do want
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to see all its output printed to stdout instead of being logged via
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syslog(). This also makes dhcpd use the dhcpd.conf in its working
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directory and write the dhcpd.leases file there. */
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/* #define DEBUG */
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/* Define this to see what the parser is parsing. You probably don't
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want to see this. */
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/* #define DEBUG_TOKENS */
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/* Define this to see dumps of incoming and outgoing packets. This
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slows things down quite a bit... */
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/* #define DEBUG_PACKET */
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/* Define this if you want to see dumps of expression evaluation. */
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/* #define DEBUG_EXPRESSIONS */
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/* Define this if you want to see dumps of find_lease() in action. */
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/* #define DEBUG_FIND_LEASE */
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/* Define this if you want to see dumps of parsed expressions. */
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/* #define DEBUG_EXPRESSION_PARSE */
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/* Define this if you want to watch the class matching process. */
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/* #define DEBUG_CLASS_MATCHING */
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/* Define this if you want to track memory usage for the purpose of
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noticing memory leaks quickly. */
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/* #define DEBUG_MEMORY_LEAKAGE */
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/* #define DEBUG_MEMORY_LEAKAGE_ON_EXIT */
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/* Define this if you want exhaustive (and very slow) checking of the
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malloc pool for corruption. */
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/* #define DEBUG_MALLOC_POOL */
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/* Define this if you want to see a message every time a lease's state
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changes. */
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/* #define DEBUG_LEASE_STATE_TRANSITIONS */
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/* Define this if you want to maintain a history of the last N operations
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that changed reference counts on objects. This can be used to debug
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cases where an object is dereferenced too often, or not often enough. */
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/* #define DEBUG_RC_HISTORY */
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/* Define this if you want to see the history every cycle. */
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/* #define DEBUG_RC_HISTORY_EXHAUSTIVELY */
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/* This is the number of history entries to maintain - by default, 256. */
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/* #define RC_HISTORY_MAX 10240 */
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/* Define this if you want dhcpd to dump core when a non-fatal memory
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allocation error is detected (i.e., something that would cause a
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memory leak rather than a memory smash). */
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/* #define POINTER_DEBUG */
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/* Define this if you want debugging output for DHCP failover protocol
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messages. */
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/* #define DEBUG_FAILOVER_MESSAGES */
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/* Define this to include contact messages in failover message debugging.
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The contact messages are sent once per second, so this can generate a
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lot of log entries. */
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/* #define DEBUG_FAILOVER_CONTACT_MESSAGES */
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/* Define this if you want debugging output for DHCP failover protocol
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event timeout timing. */
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/* #define DEBUG_FAILOVER_TIMING */
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/* Define this if you want to include contact message timing, which is
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performed once per second and can generate a lot of log entries. */
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/* #define DEBUG_FAILOVER_CONTACT_TIMING */
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/* Define this if you want all leases written to the lease file, even if
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they are free leases that have never been used. */
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/* #define DEBUG_DUMP_ALL_LEASES */
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/* Define this if you want to see the requests and replies between the
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DHCP code and the DNS library code. */
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/* #define DEBUG_DNS_UPDATES */
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/* Define this if you want to debug the host part of the inform processing */
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/* #define DEBUG_INFORM_HOST */
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/* Define this if you want to debug the binary leases (lease_chain) code */
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/* #define DEBUG_BINARY_LEASES */
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/* Define this if you want to debug checksum calculations */
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/* #define DEBUG_CHECKSUM */
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/* Define this if you want to verbosely debug checksum calculations */
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/* #define DEBUG_CHECKSUM_VERBOSE */
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/* Define this if you want DHCP failover protocol support in the DHCP
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server. */
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/* #define FAILOVER_PROTOCOL */
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/* Define this if you want DNS update functionality to be available. */
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#define NSUPDATE
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/* Define this if you want to enable the DHCP server attempting to
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find a nameserver to use for DDNS updates. */
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#define DNS_ZONE_LOOKUP
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/* Define this if you want the dhcpd.pid file to go somewhere other than
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the default (which varies from system to system, but is usually either
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/etc or /var/run. */
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/* #define _PATH_DHCPD_PID "/var/run/dhcpd.pid" */
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/* Define this if you want the dhcpd.leases file (the dynamic lease database)
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to go somewhere other than the default location, which is normally
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/etc/dhcpd.leases. */
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/* #define _PATH_DHCPD_DB "/etc/dhcpd.leases" */
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/* Define this if you want the dhcpd.conf file to go somewhere other than
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the default location. By default, it goes in /etc/dhcpd.conf. */
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/* #define _PATH_DHCPD_CONF "/etc/dhcpd.conf" */
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/* Network API definitions. You do not need to choose one of these - if
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you don't choose, one will be chosen for you in your system's config
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header. DON'T MESS WITH THIS UNLESS YOU KNOW WHAT YOU'RE DOING!!! */
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/* Define USE_SOCKETS to use the standard BSD socket API.
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On many systems, the BSD socket API does not provide the ability to
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send packets to the 255.255.255.255 broadcast address, which can
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prevent some clients (e.g., Win95) from seeing replies. This is
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not a problem on Solaris.
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In addition, the BSD socket API will not work when more than one
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network interface is configured on the server.
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However, the BSD socket API is about as efficient as you can get, so if
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the aforementioned problems do not matter to you, or if no other
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API is supported for your system, you may want to go with it. */
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/* #define USE_SOCKETS */
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/* Define this to use the Sun Streams NIT API.
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The Sun Streams NIT API is only supported on SunOS 4.x releases. */
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/* #define USE_NIT */
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/* Define this to use the Berkeley Packet Filter API.
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The BPF API is available on all 4.4-BSD derivatives, including
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NetBSD, FreeBSD and BSDI's BSD/OS. It's also available on
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DEC Alpha OSF/1 in a compatibility mode supported by the Alpha OSF/1
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packetfilter interface. */
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/* #define USE_BPF */
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/* Define this to use the raw socket API.
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The raw socket API is provided on many BSD derivatives, and provides
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a way to send out raw IP packets. It is only supported for sending
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packets - packets must be received with the regular socket API.
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This code is experimental - I've never gotten it to actually transmit
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a packet to the 255.255.255.255 broadcast address - so use it at your
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own risk. */
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/* #define USE_RAW_SOCKETS */
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/* Define this to keep the old program name (e.g., "dhcpd" for
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the DHCP server) in place of the (base) name the program was
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invoked with. */
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/* #define OLD_LOG_NAME */
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/* Define this to change the logging facility used by dhcpd. */
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/* #define DHCPD_LOG_FACILITY LOG_DAEMON */
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/* Define this if you want to be able to execute external commands
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during conditional evaluation. */
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/* #define ENABLE_EXECUTE */
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/* Define this if you aren't debugging and you want to save memory
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(potentially a _lot_ of memory) by allocating leases in chunks rather
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than one at a time. */
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#define COMPACT_LEASES
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/* Define this if you want to be able to save and playback server operational
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traces. */
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/* #define TRACING */
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/* Define this if you want the server to use the previous behavior
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when determining the DDNS TTL. If the user has specified a ddns-ttl
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option that is used to detemine the ttl. (If the user specifies
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an option that references the lease structure it is only usable
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for v4. In that case v6 will use the default.) Otherwise when
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defined the defaults are: v4 - 1/2 the lease time,
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v6 - DEFAULT_DDNS_TTL. When undefined the defaults are 1/2 the
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(preferred) lease time for both but with a cap on the maximum. */
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/* #define USE_OLD_DDNS_TTL */
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/* Define this if you want a DHCPv6 server to send replies to the
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source port of the message it received. This is useful for testing
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but is only included for backwards compatibility. */
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/* #define REPLY_TO_SOURCE_PORT */
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/* Define this if you want to enable strict checks in DNS Updates mechanism.
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Do not enable this unless are DHCP developer. */
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/* #define DNS_UPDATES_MEMORY_CHECKS */
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/* Define this if you want to allow domain list in domain-name option.
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RFC2132 does not allow that behavior, but it is somewhat used due
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to historic reasons. Note that it may be removed some time in the
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future. */
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#define ACCEPT_LIST_IN_DOMAIN_NAME
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/* In previous versions of the code when the server generates a NAK
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it doesn't attempt to determine if the configuration included a
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server ID for that client. Defining this option causes the server
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to make a modest effort to determine the server id when building
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a NAK as a response. This effort will only check the first subnet
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and pool associated with a shared subnet and will not check for
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host declarations. With some configurations the server id
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computed for a NAK may not match that computed for an ACK. */
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#define SERVER_ID_FOR_NAK
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/* NOTE: SERVER_ID_CHECK switch has been removed. Enabling server id
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* checking is now done via the server-id-check statement. Please refer
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* to the dhcpd manpage (server/dhcpd.conf.5) */
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/* Include code to do a slow transition of DDNS records
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from the interim to the standard version, or backwards.
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The normal code will handle removing an old style record
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when the name on a lease is being changed. This adds code
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to handle the case where the name isn't being changed but
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the old record should be removed to allow a new record to
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be added. This is the slow transition as leases are only
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updated as a client touches them. A fast transition would
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entail updating all the records at once, probably at start
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up. */
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#define DDNS_UPDATE_SLOW_TRANSITION
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/* Define the default prefix length passed from the client to
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the script when modifying an IPv6 IA_NA or IA_TA address.
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The two most useful values are 128 which is what the current
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specifications call for or 64 which is what has been used in
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the past. For most OSes 128 will indicate that the address
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is a host address and doesn't include any on-link information.
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64 indicates that the first 64 bits are the subnet or on-link
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prefix. */
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#define DHCLIENT_DEFAULT_PREFIX_LEN 128
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/* Enable the gentle shutdown signal handling. Currently this
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means that on SIGINT or SIGTERM a client will release its
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address and a server in a failover pair will go through
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partner down. Both of which can be undesireable in some
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situations. We plan to revisit this feature and may
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make non-backwards compatible changes including the
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removal of this define. Use at your own risk. */
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/* #define ENABLE_GENTLE_SHUTDOWN */
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/* Include old error codes. This is provided in case you
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are building an external program similar to omshell for
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which you need the ISC_R_* error codes. You should switch
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to DHCP_R_* error codes for those that have been defined
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(see includes/omapip/result.h). The extra defines and
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this option will be removed at some time. */
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/* #define INCLUDE_OLD_DHCP_ISC_ERROR_CODES */
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/* Use the older factors for scoring a lease in the v6 client code.
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The new factors cause the client to choose more bindings (IAs)
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over more addresse within a binding. Most uses will get a
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single address in a single binding and only get an adverstise
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from a single server and there won't be a difference. */
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/* #define USE_ORIGINAL_CLIENT_LEASE_WEIGHTS */
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/* Print out specific error messages for dhclient, dhcpd
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or dhcrelay when processing an incorrect command line. This
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is included for those that might require the exact error
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messages, as we don't expect that is necessary it is on by
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default. */
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#define PRINT_SPECIFIC_CL_ERRORS
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/* Limit the value of a file descriptor the serve will use
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when accepting a connecting request. This can be used to
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limit the number of TCP connections that the server will
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allow at one time. A value of 0 means there is no limit.*/
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#define MAX_FD_VALUE 200
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/* Enable enforcement of the require option statement as documented
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* in man page. Instructs the dhclient, when in -6 mode, to discard
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* offered leases that do not contain all options specified as required
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* in the client's configuration file. The client already enforces this
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* in -4 mode. */
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/* #define ENFORCE_DHCPV6_CLIENT_REQUIRE */
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/* Enable the invocation of the client script with a FAIL state code
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* by dhclient when running in one-try mode (-T) and the attempt to
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* obtain the desired lease(s) fails. Applies to IPv4 mode only. */
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/* #define CALL_SCRIPT_ON_ONETRY_FAIL */
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/* Include definitions for various options. In general these
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should be left as is, but if you have already defined one
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of these and prefer your definition you can comment the
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RFC define out to avoid conflicts */
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#define RFC2563_OPTIONS
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#define RFC2937_OPTIONS
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#define RFC4776_OPTIONS
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#define RFC4833_OPTIONS
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#define RFC4994_OPTIONS
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#define RFC5192_OPTIONS
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#define RFC5223_OPTIONS
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#define RFC5417_OPTIONS
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#define RFC5460_OPTIONS
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#define RFC5969_OPTIONS
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#define RFC5970_OPTIONS
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#define RFC5986_OPTIONS
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#define RFC6011_OPTIONS
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#define RFC6011_OPTIONS
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#define RFC6153_OPTIONS
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#define RFC6334_OPTIONS
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#define RFC6440_OPTIONS
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#define RFC6731_OPTIONS
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#define RFC6939_OPTIONS
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#define RFC6977_OPTIONS
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#define RFC7083_OPTIONS
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#define RFC7341_OPTIONS
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#define RFC7618_OPTIONS
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#define RFC7710_OPTIONS
includes
site.h
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