Initial import to github (version 4.5)

HISTORY

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+2012-12-03:
+	4.5 version
+	* destroy() in plugins for smooth shutdown.
+	* Change plugin functions declaration. Use more appropriate types.
+	* radius_plugin: get rid of freeradius-client library.
+	  Use a system libradius instead.
+	* radius_plugin: rename bind_interface option to bind_to and allow
+	  to specify an IP address there.
+
+2012-11-01:
+	4.4 version
+	* radius_plugin: send accounting only for DHCPACK packet.
+
+2012-09-02:
+	4.3 version
+	* Fix options string parsing
+	* Minor fix in radius_plugin
+	* Fix byte order for eh->ether_type
+
+2012-03-07:
+	4.2 version
+	* If there is no interface to listen, dhcprelya took 100% CPU.
+	* Fix memory leaks.
+	* Implement rps_limit opetion to protect a server from a packet storm.
+	* Fix checksum calculation in option82_plugin (thanks to Manuel Kasper).
+	* Allow specify a DHCP server port. Useful for testing. (Manuel Kasper)
+
+2009-07-16:
+	4.1 version
+	* In radius plugin: build NAS port as client IP, not random.
+
+2009-06-16:
+	4.0 version
+	* Be more RFC compliant:
+	  + don't change GIADDR if it's not 0.
+	  + don't save incoming interface for a client.
+	    detect it by GIADDR address. It's simplified
+	    code a lot.
+	  + don't use INADDR_BROADCAST for answers, but
+	    YIADDR instead (excluding bellow).
+	  + take into account a BROADCAST flag. If it's on,
+	    send an answer as a broadcast (both L2 & L3).
+	* Added option82 plugin. RFC 3046 implementation.
+	* Add a bind_interface option for radius plugin.
+
+2009-02-13:
+	3.0 version
+	* Add -A and -c options. They are ISC dhcrelay compatible.
+	* Change configuration file format: add sections (ala .ini).
+	* Add a plugin architecture.
+	* Make log as a plugin. Improve it a lot.
+
+2009-01-13:
+	2.3 version
+	* Set MAC address in reply packets to MAC address of client.
+	  Exotic clients don't get packets with a broadcast MAC.
+
+2009-01-12:
+	2.2 version
+	* Minor bugfix: buffer size for sendto was a little more.
+
+2008-12-15:
+	2.1 version released
+	* Close standard descriptors when daemonize.
+	* Fix an error in calculation of servers index
+	  (when server >2).
+
+2008-09-19:
+	2.0 version released
+	* It's possible to put your configureation into a config file.
+	  The old syntax still can be used for compatibility.
+
+2008-05-26:
+	1.3 version released
+	* When an interface disabled/removed dhcprelya looped and eated CPU time
+
+2008-04-30:
+	1.2 version released
+	* Do not turn on promisc mode for interfaces.
+	* Do not create PID file when run with -d.
+	* A little code clean up.
+
+2008-02-01:
+	1.1 version released
+	* Optimized. Less system CPU time used.
+
+2007-12-17:
+	1.0 version released

Makefile

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+PROGNAME=	dhcprelya
+OBJS=		dhcprelya.o utils.o net_utils.o ip_checksum.o log_plugin.o \
+		option82_plugin.o
+HEADER=		dhcprelya.h
+LIBS=		-L/usr/local/lib -lpcap -lutil -lthr
+CFLAGS+=	-Wall -fPIC
+
+LOG_PLUGIN_OBJS=	utils.o log_plugin.o
+OPTION82_PLUGIN_OBJS=	utils.o option82_plugin.o ip_checksum.o
+
+.if defined(DEBUG)
+DEBUG_FLAGS=	-g
+.else
+STRIP_FLAG=	-s
+.endif
+
+LOG_PLUGIN=	log_plugin
+RADIUS_PLUGIN=	radius_plugin
+OPTION82_PLUGIN=	option82_plugin
+.if defined(WITH_RADIUS_PLUGIN)
+LIBS+=		-lradius
+RADIUS_PLUGIN_OBJS=	utils.o net_utils.o radius_plugin.o
+OBJS+=		radius_plugin.o
+CFLAGS+=	-rdynamic
+
+all:	${PROGNAME} ${PROGNAME}_${RADIUS_PLUGIN}.so ${PROGNAME}_${LOG_PLUGIN}.so \
+	${PROGNAME}_${OPTION82_PLUGIN}.so
+.else
+all:	${PROGNAME} ${PROGNAME}_${LOG_PLUGIN}.so ${PROGNAME}_${OPTION82_PLUGIN}.so
+.endif
+
+${PROGNAME}: ${OBJS}
+	${CC} ${DEBUG_FLAGS} ${CFLAGS} ${OBJS} ${LIBS} -o ${.TARGET}
+
+${PROGNAME}_${RADIUS_PLUGIN}.so: ${OBJS}
+	${CC} ${DEBUG_FLAGS} -shared ${RADIUS_PLUGIN_OBJS} -o ${.TARGET}
+
+${PROGNAME}_${LOG_PLUGIN}.so: ${OBJS}
+	${CC} ${DEBUG_FLAGS} -shared ${LOG_PLUGIN_OBJS} -o ${.TARGET}
+
+${PROGNAME}_${OPTION82_PLUGIN}.so: ${OBJS}
+	${CC} ${DEBUG_FLAGS} -shared ${OPTION82_PLUGIN_OBJS} -o ${.TARGET}
+
+.c.o: ${HEADER}
+	${CC} ${CPPFLAGS} ${DEBUG_FLAGS} ${CFLAGS} -c ${.IMPSRC}
+
+clean:
+	rm -f ${PROGNAME} *.so *.o *.core
+
+install: ${PROGNAME}
+	install ${STRIP_FLAG} -m 555 ${PROGNAME} /usr/local/sbin/
+	install ${STRIP_FLAG} -m 555 ${PROGNAME}_${LOG_PLUGIN}.so /usr/local/lib/
+	install ${STRIP_FLAG} -m 555 ${PROGNAME}_${OPTION82_PLUGIN}.so /usr/local/lib/
+.if defined(WITH_RADIUS_PLUGIN)
+	install ${STRIP_FLAG} -m 555 ${PROGNAME}_${RADIUS_PLUGIN}.so /usr/local/lib/
+.endif
+
+install-rc:
+	install -m 555 ${PROGNAME}.sh /usr/local/etc/rc.d/${PROGNAME}
+
+deinstall:
+	rm -f /usr/local/sbin/${PROGNAME} /usr/local/lib/${PROGNAME}_* /usr/local/etc/rc.d/${PROGNAME}

README

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+dhcprelya is a lightweight DHCP relay agent written for Yandex company for
+high loaded routers with tens interfaces and thousands hosts behind them.
+
+It's fast, independed from any side libraries, and it does not turn on
+a promisc mode for listening interfaces. Plugins supported. With plugins
+you can implement any functionality. A command line options is compatible
+with ISC dhcrelay but extended.
+
+Some ideas was taken from Edwin's dhcprelay (net/dhcprelay in ports collection.
+which unfortunately has some shortages) and dhcpdump (net/dhcpdump).
+
+It's distributed under BSD license.
+
+HOW TO RUN
+There are two syntax. The first one is a ISC dhcrelay compatible:
+
+dhcprelya [-d] [-p<pidfile>] -A <packet_size> -c <hops_count>
+	-i<if1>... -i<ifN> <server1>... <serverN>
+
+-i	- an interfaces list that should be listened.
+server	- a servers list where request will be forward to.
+-A	- set maximum packet size. Default: 1400. It's more then enough.
+-c	- When hops counter in a DHCP packet more then this value,
+	  the packet is dropped. It prevets loops. Defaul: 10.
+
+A second one allows to use a configuration file:
+
+dhcprelya [-d] [-p<pidfile>] -f <config.file>
+
+Common options are:
+-d	- do not demonize and output debugging info onto terminal.
+-p	- use not default pid file. You can run more than one copy of
+	  dhcprelya with different pid files.
+
+See dhcprelya.conf-example for format.
+
+If an interface does not exist on this host, it'll be ignored. It's useful
+for only one config file for all routers with logical interfaces (vlanNN etc.).
+
+Any questions, bug reports and feature requests are welcome.
+
+Sergey Matveychuk <[email protected]>