added full udhcp integration

Makefile

@@ -22,7 +22,7 @@ include $(TOPDIR).config
 include $(TOPDIR)Rules.mak
 SUBDIRS:=applets archival archival/libunarchive console-tools \
 	editors fileutils findutils init miscutils modutils networking \
-	procps loginutils shell shellutils sysklogd \
+	networking/udhcp procps loginutils shell shellutils sysklogd \
 	textutils util-linux libbb libpwdgrp
 
 all:    do-it-all

examples/udhcpc/default.bound → examples/udhcp/sample.bound

@@ -1,7 +1,7 @@
 #!/bin/sh
 # Sample udhcpc renew script
 
-RESOLV_CONF="/etc/resolv.conf"
+RESOLV_CONF="/etc/udhcpc/resolv.conf"
 
 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
 [ -n "$subnet" ] && NETMASK="netmask $subnet"

examples/udhcp/sample.nak

@@ -0,0 +1,4 @@
+#!/bin/sh
+# Sample udhcpc nak script
+
+echo Received a NAK: $message

examples/udhcpc/default.renew → examples/udhcp/sample.renew

@@ -1,7 +1,7 @@
 #!/bin/sh
 # Sample udhcpc bound script
 
-RESOLV_CONF="/etc/resolv.conf"
+RESOLV_CONF="/etc/udhcpc/resolv.conf"
 
 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
 [ -n "$subnet" ] && NETMASK="netmask $subnet"
@@ -27,4 +27,4 @@ for i in $dns
 do
 	echo adding dns $i
 	echo nameserver $i >> $RESOLV_CONF
-done
+done

examples/udhcpc/default.script → examples/udhcp/sample.script

@@ -4,4 +4,4 @@
 # common initialization first, especially if more dhcp event notifications
 # are added.
 
-exec /usr/share/udhcpc/default.$1
+exec /usr/share/udhcpc/sample.$1

examples/udhcp/simple.script

@@ -0,0 +1,39 @@
+#!/bin/sh
+
+# udhcpc script edited by Tim Riker <Tim@Rikers.org>
+
+[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
+
+RESOLV_CONF="/etc/resolv.conf"
+[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
+[ -n "$subnet" ] && NETMASK="netmask $subnet"
+
+case "$1" in
+	deconfig)
+		/sbin/ifconfig $interface 0.0.0.0
+		;;
+
+	renew|bound)
+		/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
+
+		if [ -n "$router" ] ; then
+			echo "deleting routers"
+			while route del default gw 0.0.0.0 dev $interface ; do
+				:
+			done
+
+			for i in $router ; do
+				route add default gw $i dev $interface
+			done
+		fi
+
+		echo -n > $RESOLV_CONF
+		[ -n "$domain" ] && echo search $domain >> $RESOLV_CONF
+		for i in $dns ; do
+			echo adding dns $i
+			echo nameserver $i >> $RESOLV_CONF
+		done
+		;;
+esac
+
+exit 0

examples/udhcp/udhcpd.conf

@@ -0,0 +1,116 @@
+# Sample udhcpd configuration file (/etc/udhcpd.conf)
+
+# The start and end of the IP lease block
+
+start 		192.168.0.20	#default: 192.168.0.20
+end		192.168.0.254	#default: 192.168.0.254
+
+
+# The interface that udhcpd will use
+
+interface	eth0		#default: eth0
+
+
+# The maximim number of leases (includes addressesd reserved
+# by OFFER's, DECLINE's, and ARP conficts
+
+#max_leases	254		#default: 254
+
+
+# If remaining is true (default), udhcpd will store the time
+# remaining for each lease in the udhcpd leases file. This is
+# for embedded systems that cannot keep time between reboots.
+# If you set remaining to no, the absolute time that the lease
+# expires at will be stored in the dhcpd.leases file.
+
+#remaining	yes		#default: yes
+
+
+# The time period at which udhcpd will write out a dhcpd.leases
+# file. If this is 0, udhcpd will never automatically write a
+# lease file. (specified in seconds)
+
+#auto_time	7200		#default: 7200 (2 hours)
+
+
+# The amount of time that an IP will be reserved (leased) for if a 
+# DHCP decline message is received (seconds).
+
+#decline_time	3600		#default: 3600 (1 hour)
+
+
+# The amount of time that an IP will be reserved (leased) for if an
+# ARP conflct occurs. (seconds
+
+#conflict_time	3600		#default: 3600 (1 hour)
+
+
+# How long an offered address is reserved (leased) in seconds
+
+#offer_time	60		#default: 60 (1 minute)
+
+# If a lease to be given is below this value, the full lease time is
+# instead used (seconds).
+
+#min_lease	60		#defult: 60
+
+
+# The location of the leases file
+
+#lease_file	/var/lib/misc/udhcpd.leases	#defualt: /var/lib/misc/udhcpd.leases
+
+# The location of the pid file
+#pidfile	/var/run/udhcpd.pid	#default: /var/run/udhcpd.pid
+
+# Everytime udhcpd writes a leases file, the below script will be called.
+# Useful for writing the lease file to flash every few hours.
+
+#notify_file				#default: (no script)
+
+#notify_file	dumpleases 	# <--- usefull for debugging
+
+# The following are bootp specific options, setable by udhcpd.
+
+#siaddr		192.168.0.22		#default: 0.0.0.0
+
+#sname		zorak			#default: (none)
+
+#boot_file	/var/nfs_root		#default: (none)
+
+# The remainer of options are DHCP options and can be specifed with the
+# keyword 'opt' or 'option'. If an option can take multiple items, such
+# as the dns option, they can be listed on the same line, or multiple
+# lines. The only option with a default is 'lease'.
+
+#Examles
+opt	dns	192.168.10.2 192.168.10.10
+option	subnet	255.255.255.0
+opt	router	192.168.10.2
+opt	wins	192.168.10.10
+option	dns	129.219.13.81	# appened to above DNS servers for a total of 3
+option	domain	local
+option	lease	864000		# 10 days of seconds
+
+
+# Currently supported options, for more info, see options.c
+#subnet
+#timezone
+#router
+#timesvr
+#namesvr
+#dns
+#logsvr
+#cookiesvr
+#lprsvr
+#bootsize
+#domain
+#swapsvr
+#rootpath
+#ipttl
+#mtu
+#broadcast
+#wins
+#lease
+#ntpsrv
+#tftp
+#bootfile

include/applets.h

@@ -152,6 +152,9 @@
 #ifdef CONFIG_DUMPKMAP
 	APPLET(dumpkmap, dumpkmap_main, _BB_DIR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_DUMPLEASES
+        APPLET(dumpleases, dumpleases_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_DUTMP
 	APPLET(dutmp, dutmp_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER)
 #endif
@@ -495,7 +498,10 @@
 	APPLET(tty, tty_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
 #endif
 #ifdef CONFIG_UDHCPC
-	APPLET(udhcpc, udhcpc_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
+	APPLET(udhcpc, udhcpc_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER)
+#endif
+#ifdef CONFIG_UDHCPD
+        APPLET(udhcpd, udhcpd_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER)
 #endif
 #ifdef CONFIG_UMOUNT
 	APPLET(umount, umount_main, _BB_DIR_BIN, _BB_SUID_NEVER)

include/usage.h

@@ -385,6 +385,14 @@
 #define dumpkmap_example_usage \
 	"$ dumpkmap > keymap\n"
 
+#define dumpleases_trivial_usage \
+	"[-r|-a] [-f LEASEFILE]"
+#define dumpleases_full_usage \
+	"Usage: dumpleases -f <file> -[r|a]\n" \
+	"\t-f,\t--file=FILENAME\tLeases file to load\n" \
+	"\t-r,\t--remaining\tInterepret lease times as time remaing\n" \
+	"\t-a,\t--absolute\tInterepret lease times as expire time\n"
+
 #define dutmp_trivial_usage \
 	"[FILE]"
 #define dutmp_full_usage \
@@ -1945,12 +1953,14 @@
 	"/dev/tty2\n"
 
 #define udhcpc_trivial_usage \
-	"[-fqv] [-c CLIENTID] [-H HOSTNAME] [-i INTERFACE]\n[-p file] [-r IP] [-s script]"
+	"[-fbnqv] [-c CLIENTID] [-H HOSTNAME] [-i INTERFACE]\n[-p pidfile] [-r IP] [-s script]"
 #define udhcpc_full_usage \
-	"\tUsage: udhcpcd [OPTIONS]\n" \
+	"\tUsage: udhcpc [OPTIONS]\n" \
 	"\t-c,\t--clientid=CLIENTID\tClient identifier\n" \
 	"\t-H,\t--hostname=HOSTNAME\tClient hostname\n" \
+	"\t-h,\t                   \tAlias for -h\n" \
 	"\t-f,\t--foreground\tDo not fork after getting lease\n" \
+	"\t-b,\t--background\tFork to background if lease cannot be immediately negotiated.\n" \
 	"\t-i,\t--interface=INTERFACE\tInterface to use (default: eth0)\n" \
 	"\t-n,\t--now\tExit with failure if lease cannot be immediately negotiated.\n" \
 	"\t-p,\t--pidfile=file\tStore process ID of daemon in file\n" \
@@ -1959,6 +1969,12 @@
 	"\t-s,\t--script=file\tRun file at dhcp events (default: /usr/share/udhcpc/default.script)\n" \
 	"\t-v,\t--version\tDisplay version"
 
+#define udhcpd_trivial_usage \
+	"[configfile]\n" \
+
+#define udhcpd_full_usage \
+	"\tUsage: udhcpd [configfile]\n"
+
 #ifdef CONFIG_FEATURE_MOUNT_FORCE
   #define USAGE_MOUNT_FORCE(a) a
 #else

networking/Makefile.in

@@ -35,7 +35,6 @@ NETWORKING-$(CONFIG_TELNET)		+= telnet.o
 NETWORKING-$(CONFIG_TELNETD)    	+= telnetd.o
 NETWORKING-$(CONFIG_TFTP)		+= tftp.o
 NETWORKING-$(CONFIG_TRACEROUTE)		+= traceroute.o
-NETWORKING-$(CONFIG_UDHCPC)		+= udhcpc.o
 NETWORKING-$(CONFIG_WGET)		+= wget.o
 
 libraries-y+=$(NETWORKING_DIR)$(NETWORKING_AR)

networking/config.in

@@ -47,12 +47,13 @@ if [ "$CONFIG_TRACEROUTE" = "y" ]; then
     bool '  Enable verbose output'			CONFIG_FEATURE_TRACEROUTE_VERBOSE
     bool '  Enable SO_DEBUG option'	CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
 fi
-bool 'udhcpc'       CONFIG_UDHCPC
 bool 'wget'	    CONFIG_WGET
 if [ "$CONFIG_WGET" = "y" ]; then
     bool '  Enable a nifty process meter (+2k)'	CONFIG_FEATURE_WGET_STATUSBAR
 	bool '  Enable HTTP authentication'			CONFIG_FEATURE_WGET_AUTHENTICATION
 fi
 
+source networking/udhcp/config.in
+
 endmenu
 

networking/udhcp/AUTHORS

@@ -0,0 +1,13 @@
+udhcp server/client package
+-----------------------
+
+Russ Dill <Russ.Dill@asu.edu>
+Matthew Ramsay	<matthewr@moreton.com.au>
+Chris Trew <christ@moreton.com.au>
+
+Other Credits:
+--------------
+Moreton Bay	(http://www.moretonbay.com/)
+Lineo		(http://opensource.lineo.com)
+
+

networking/udhcp/COPYING

@@ -0,0 +1,339 @@
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+                          675 Mass Ave, Cambridge, MA 02139, USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+			    Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
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+have the freedom to distribute copies of free software (and charge for
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+    Copyright (C) 19yy  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) 19yy name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.

networking/udhcp/ChangeLog

@@ -0,0 +1,246 @@
+0.9.8 (pending)
++ udhcp now fits nicely into busybox
+  (Glenn McGrath <bug1@optushome.com.au> as well as myself)
++ updated client manpage (me)
++ both client and server now use sockets for signal handling,
+  hopefully, this will be the last needed change in signal
+  handling, I'm fairly certain all the possible races are now
+  closed. (me)
++ The server now restarts the auto_time timer when it receives
+  a SIGUSR1 (write out config file). (me)
++ Improve signal handling (David Poole)
++ Fix to config file parsing (Matt Kraai)
++ Fix load lease logic (me)
++ Fix clear_lease logic (me)
++ -h is now an alias for -H (udhcp bug #1253)
++ Shorter timeout on not receiving offers (me)
++ Improved signal behavior by client (me)
++ Would never assign end address (Keith Smith <keith@ksmith.com>)
++ Was improperly reporting yiaddr as siaddr (ben-udhcp@bdlow.net)
+  udhcp bug#1256
++ Fixed reading of client id (David Poole <davep@portsmith.com>)
++ change sys_errlist[] to strerror() as it aparently doesn't exist
+  (andersee <andersee@codepoet.org>)
++ fixed get_raw_packet so it returns -2 on non fatal errors
+  (Ted Lemon <Ted.Lemon@nominum.com>)
++ Improved (hopefully) NAKing behavior (me)
++ Added -b option (Jouni Malinen)
++ Compute checksums correctly on big endian hosts 
+  (Jouni Malinen <jkmaline@cc.hut.fi>)
+
+0.9.7 (020526)
++ Use add_lease in read_leases, sanitizes leases more, and clears out exprired
+  ones if there is no more room (me)
++ Moved udhcpd.leases to /var/lib/misc/udhcpd.leases (Debian bug #147747)
++ Change (obsolete) AF_INET in arping.c to PF_PACKET (Debian bug #127049)
++ Added script hook for DHCPNAK (nak), as well as providing the message option
+  (me)
++ Generate the paramaters request list by seeing what options in options.c are
+  ored with OPTION_REQ in options.c
++ Fix dhcp renew forgetfullness on client (bug #1230)
++ Fix dhcp release bug on client (bug #1231)
++ Set option request list for DHCP renew (bug #1233)
++ Set BOOTREQUEST/REPLY properly
++ Change client-identifier field to popularly expected behavior (me)
++ Only reopen port on errors (me)
++ Change fork/close/setsid structures to daemon() (me)
++ Allow user to specify udhcpd config file at run time (Steven, me)
++ Write pidfile after changing it (Steven CTR Carr <Steven.CTR.Carr@tc.faa.gov>)
++ Added env var docs to udhcpc man page (Matt)
++ Standardized lowercase udhcp in documentation (me)
++ Accept packets without a UDP checksum (me)
++ Accept packets with extra garbage (me)
++ Better error handling in files.c (me)
++ Combined read_interface function to reduce COMBINED_BINARY size (me)
++ Drop calc_length(), some servers choke on smaller packets (me)
++ Try to clean some fat out (me)
+
+0.9.6 (011001)
++ Added bootp paramaters to server (me)
++ Added bootp paramaters to client (me)
++ Added vendor id to client (me)
++ Better pidfile handling in client and server (me)
++ Added man pages (Matt Kraai <kraai@alumni.carnegiemellon.edu>)
+
+0.9.5 (010914)
++ Fixed $HOME and $PATH env passing (me)
++ Fixed client to only listen for raw packets on correct interface (me)
++ added --quit,-q option to quit after a lease is obtained (me)
++ Fixed 100% CPU utilization by client when interface is down (me)
+
+0.9.4 (010827)
++ Force broadcast to broken clients that request unicast (ie, MSFT 98)
++ Make install rules (Adam J. Richter <adam@yggdrasil.com>)
++ One scripts, instead of many (Adam)
++ Removed script paramater info files (env vars only) (Adam)
++ Controlling of forking behavior in client (Adam)
++ General script.c/dhcpc.c cleanups (Adam)
+
+0.9.3 (010820)
++ Increased debugging verbosity (me)
++ Cut trailing whitespace when reading config file (me)
++ added hostname option to client (me)
++ fixed a strncpy bug in script.c (me)
++ fixed a leaky socket in dhcpc.c (me)
++ fixed a leaky socket in dhcpd.c (me)
+
+0.9.2 (010810)
++ Added raw sockets to client (me)
++ alignment fixes (Mark Huang)
++ compiler warning fixes (Mark Huang)
++ client now sends parameter list (Mark Huang/me)
++ added ipttl option
++ Does now not request broadcast packets
+
+0.9.1 (010806)
++ Added udhcpc client
++ reorganized functions/files
++ listening socket now only binds to one interface
+
+0.9.0 (010720) Major rewrite, current changes, goals:
++ should not segfault on bogus packets.
++ Options can be read from sname and file fields.
++ supports all DHCP messages (release, decline, inform).
++ IP block is now specified by a range of IP's.
++ Leases file now contains lease time (relative, or absolute).
++ Just about any DHCP option is now supported.
++ DNS entries are no longer read from resolv.conf
++ Lease file can be written periodically when the process receives a SIGUSR1
++ arpping should be supported on all arches.
++ support for DHCP relays.
++ DHCP messages can be unicast if the client requests it.
++ many, many, many other things.
+
+0.8.29 (000323)
++ stable(?) release
+
+
+0.8.28 (000323)
++ removed alarm as it was causing server to go down
++ removed debugging
++ break down dhcpd.c into manageable files
+
+
+0.8.27 (000221)
++ OFFER also sends gateway/subnet (for picky dhcp clients)
++ multiple DNS now handled from resolv.conf if available
++ multiple WINS (from dhcpd.conf)
+
+0.8.25 (000120)
++ now compiles *and* runs on a generic linux system
+	tested with a windows 98 client and the sample config
+	files in the samples directory.
+
+0.8.24 (000117)
++ makeiplist tool has basic functionality in place
++ new sample config files
++ route add -host 255.255.255.255 dev eth0 added for generic linux
+
+0.8.23 (000117)
++ NETtel specific fix for ignoring dhcp requests on 2nd interface
+
+0.8.22 (000113)
++ minor changes to compile under a generic linux system
++ minor config file location changes for a generic linux system
++ makeiplist fixes.. still incomplete.. but etting closer
+
+0.8.21 (000113)
++ now sends the correct server ip instead of hardcoded value
++ minor debugging fixes for critical messages
+
+0.8.20 (000106)
++ cut out dhcp server checking.. this was causing dialout ppp
+	sessions with idle time set to never time out.
++ also removed the 10 second pause before launching.. as this
+	was originally to stop it replying to a dhcp client
+	on a NETtel which was really a bad way to do it in the
+	first place :-)
+
+0.8.19 (000104)
++ fixes for route add -host on a machine that needs to run both
+	a DHCP client and server (dual eth box)
+
+0.8.18 (991220)
+
++ Race conditions fixed by disabling alarm whilst the server is busy
++ Fixed continous clearing of the offered array so that it is only cleared
+  when it is dirty - (could change the position of when dirty is set)
+
+0.8.17 (991212)
+
+- has problems clearing out the offered array
+
+0.8.16 (991203)
++ Non blocking error is changes to informational as it is not really
+  an error
+
+0.8.15 (991129)
++ Servs the dns field 3 times (Nettel only) so that windows servers
+  dont time out whilst nettel is booting
+
+0.8.14 (991126)
++ added owner check for the offered array so clean out time may be
+  increased
++ added new func to print out chadder/MAC
+
+0.8.13 (991125)
++ added win95 support (w95 changed xid halfway through conversation)
++ had to change the offered array to use hardware addresses instead of xid
++ fixed re offered bug
++ added more debugging
+
+0.8.12 (991111)
++ debugging was real bad.. cleaned up a bit.. needs overhaul
+
+
+0.8.11 (991110)
++ fixed up offeredAddr array to actually be used now!! offeredAddr is
+	used to see if another simultaneous connecting client was offered
+	an address that we are about to offer another client (multiple
+	client bug)
++ removed re_offered variable as it breaks multiple client support
++ added lease time to ACK -- doesn't work if in OFFER
++ decreased internal array clear delay to 60 seconds
++ minor findAddr bug (returning -1 instead of 0)
++ if clients xid already in offeredAddr offer the same addr and don't add a
+	new addr to offered (caused by a client issuing multiple DISCOVERs)
+
+0.8.10 (991105)
++ \n bug in arpping
++ minor debugging changes (removed printfs etc)
++ started browseiplist (not finished)
+
+0.8.9 (19991105)
++ fixed options array size bug (options were cut off)
+
+0.8.8 (19991105)
++ ignores requests from dhcpcd on the same machine
+
+0.8.7 (19991104)
++ don't die if we can't bind to search for existing DHCP server
++ slightly more verbose syslogging
+
+0.8.6 (19991103)
++ added makeiplist (not finished -- core dumps)
++ minor debug changes
+
+0.8.5 (19991029)
++ exits if another DHCP server is already on the network
++ added Linux Makefile
+
+0.8.4 (19991026)
++ minor bug fix in findaddr preventing an addr being found
+
+0.8.3 (19991025)
++ fixed up debugging
++ minor hwaddr issues
+
+0.8.2 (19991022)
++ free leases (new arpping code from dhcpcd)
++ fixed bug where crashes if no leases/iplist file
++ syslogging and debugging switch
++ serve DNS from resolv.conf
++ fixed bug where new lease added if same mac offered
++ now checks the ip is free b4 offering
++ now supports wins server
+

networking/udhcp/Makefile.in

@@ -0,0 +1,46 @@
+# Makefile for busybox
+#
+# Copyright (C) 1999-2002 Erik Andersen <andersee@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+
+UDHCP_AR:=udhcp.a
+ifndef $(UDHCP_DIR)
+UDHCP_DIR:=$(TOPDIR)networking/udhcp/
+endif
+
+#ok, so I forgot how to do an or, but this is a quick and dirty hack
+ifeq ($(CONFIG_UDHCPC), y)
+CONFIG_UDHCP_SHARED=y
+else
+ifeq ($(CONFIG_UDHCPD), y)
+CONFIG_UDHCP_SHARED=y
+else
+CONFIG_UDHCP_SHARED=n
+endif
+endif
+
+UDHCP-y:=
+UDHCP-$(CONFIG_UDHCP_SHARED)	+= options.o socket.o packet.o pidfile.o
+UDHCP-$(CONFIG_UDHCPC)		+= dhcpc.o clientpacket.o script.o
+UDHCP-$(CONFIG_UDHCPD)		+= dhcpd.o arpping.o files.o leases.o serverpacket.o
+UDHCP-$(CONFIG_DUMPLEASES)	+= dumpleases.o
+
+libraries-y+=$(UDHCP_DIR)$(UDHCP_AR)
+
+$(UDHCP_DIR)$(UDHCP_AR): $(patsubst %,$(UDHCP_DIR)%, $(UDHCP-y))
+	$(AR) -ro $@ $(patsubst %,$(UDHCP_DIR)%, $(UDHCP-y))
+

networking/udhcp/README

@@ -0,0 +1,197 @@
+udhcp server/client package readme
+-------------------------
+
+The udhcp server/client package is primarily geared towards embedded
+systems. It does however, strive to be fully functional, and RFC
+compliant.
+
+udhcp server (udhcpd)
+--------------------
+
+The only command line argument to udhcpd is an optional specifed
+config file. If no config file is specified, udhcpd uses the default
+config file, /etc/udhcpd.conf. Ex:
+
+udhcpd /etc/udhcpd.eth1.conf
+
+The udhcp server employs a number of simple config files:
+
+udhcpd.leases
+------------
+
+The udhcpd.leases behavior is designed for an embedded system. The
+file is written either every auto_time seconds, or when a SIGUSR1
+is received (the auto_time timer restarts if a SIGUSR1 is received). 
+If you send a SIGTERM to udhcpd directly after a SIGUSR1, udhcpd will
+finish writing the leases file and wait for the aftermentioned script
+to be executed and finish before quiting, so you do not need to sleep
+between sending signals. When the file is written, a script can be
+optionally called to commit the file to flash. Lease times are stored
+in the file by time remaining in lease (for systems without clock
+that works when there is no power), or by the absolute time that it
+expires in seconds from epoch. In the remainig format, expired leases
+are stored as zero. The file is of the format:
+
+16 byte MAC
+4 byte ip address
+u32 expire time
+16 byte MAC
+4 byte ip address
+u32 expire time
+.
+etc.
+
+example: hexdump udhcpd.leases
+
+0000000 1000 c95a 27d9 0000 0000 0000 0000 0000
+0000010 a8c0 150a 0d00 2d29 5000 23fc 8566 0000
+0000020 0000 0000 0000 0000 a8c0 140a 0d00 4e29
+0000030
+
+
+udhcpd.conf
+----------
+
+The format is fairly simple, there is a sample file with all the
+available options and comments describing them in samples/udhcpd.conf
+
+
+udhcp client (udhcpc)
+--------------------
+
+The udhcp client negotiates a lease with the DHCP server and notifies
+a set of scripts when a leases is obtained or lost. The command line
+options for the udhcp client are:
+
+-c, --clientid=CLIENTID         Client identifier
+-H, --hostname=HOSTNAME         Client hostname
+-h,				Alias for -H
+-f, --foreground                Do not fork after getting lease
+-b, --background                Fork to background if lease cannot be
+                                immediately negotiated.
+-i, --interface=INTERFACE       Interface to use (default: eth0)
+-n, --now                       Exit with failure if lease cannot be
+                                immediately negotiated.
+-p, --pidfile=file              Store process ID of daemon in file
+-q, --quit                      Quit after obtaining lease
+-r, --request=IP                IP address to request (default: none)
+-s, --script=file               Run file at dhcp events (default:
+                                /usr/share/udhcpc/default.script)
+-v, --version                   Display version
+
+If the requested IP address cannot be obtained, the client accepts the
+address that the server offers.
+
+When an event occurs, udhcpc calls the action script. The script by
+default is /usr/share/udhcpc/default.script but this can be changed via 
+the command line arguments. The three possible arguments to the script 
+are:
+
+	deconfig: This argument is used when udhcpc starts, and
+	when a leases is lost. The script should put the interface in an
+	up, but deconfigured state, ie: ifconfig $interface 0.0.0.0.
+	
+	bound: This argument is used when udhcpc moves from an
+	unbound, to a bound state. All of the paramaters are set in
+	enviromental variables, The script should configure the interface,
+	and set any other relavent parameters (default gateway, dns server, 
+	etc).
+	
+	renew: This argument is used when a DHCP lease is renewed. All of
+	the paramaters are set in enviromental variables. This argument is
+	used when the interface is already configured, so the IP address,
+	will not change, however, the other DHCP paramaters, such as the
+	default gateway, subnet mask, and dns server may change.
+
+	nak: This argument is used with udhcpc receives a NAK message.
+	The script with the deconfig argument will be called directly
+	afterwards, so no changes to the network interface are neccessary.
+	This hook is provided for purely informational purposes (the
+	message option may contain a reason for the NAK).
+
+The paramaters for enviromental variables are as follows:
+
+	$HOME		- The set $HOME env or "/"
+	$PATH		- the set $PATH env or "/bin:/usr/bin:/sbin:/usr/sbin"
+	$1		- What action the script should perform
+	interface	- The interface this was obtained on
+	ip		- The obtained IP
+	siaddr		- The bootp next server option
+	sname		- The bootp server name option
+	boot_file	- The bootp boot file option
+	subnet		- The assigend subnet mask
+	timezone	- Offset in seconds from UTC
+	router		- A list of routers
+	timesvr		- A list of time servers
+	namesvr		- A list of IEN 116 name servers
+	dns		- A list of DNS server
+	logsvr		- A list of MIT-LCS UDP log servers
+	cookiesvr	- A list of RFC 865 cookie servers
+	lprsvr		- A list of LPR servers
+	hostname	- The assigned hostname
+	bootsize	- The length in 512 octect blocks of the bootfile
+	domain		- The domain name of the network
+	swapsvr		- The IP address of the client's swap server
+	rootpath	- The path name of the client's root disk
+	ipttl		- The TTL to use for this network
+	mtu		- The MTU to use for this network
+	broadcast	- The broadcast address for this network
+	ntpsrv		- A list of NTP servers
+	wins		- A list of WINS servers
+	lease		- The lease time, in seconds
+	dhcptype	- DHCP message type (safely ignored)
+	serverid	- The IP of the server
+	message		- Reason for a DHCPNAK
+	tftp		- The TFTP server name
+	bootfile	- The bootfile name
+
+additional options are easily added in options.c.
+	
+udhcpc also responds to SIGUSR1 and SIGUSR2. SIGUSR1 will force a renew state,
+and SIGUSR2 will force a release of the current lease, and cause udhcpc to
+go into an inactive state (until it is killed, or receives a SIGUSR1). You do
+not need to sleep between sending signals, as signals received are processed
+sequencially in the order they are received.
+
+
+
+compile time options
+-------------------
+
+The Makefile contains three of the compile time options:
+	
+	DEBUG: If DEBUG is defined, udhcpd will output extra debugging
+	output, compile with -g, and not fork to the background when run.
+	SYSLOG: If SYSLOG is defined, udhcpd will log all its messages
+	syslog, otherwise, it will attempt to log them to stdout.
+	
+	COMBINED_BINARY: If COMBINED_BINARY is define, one binary, udhcpd,
+	is created. If called as udhcpd, the dhcp server will be started.
+	If called as udhcpc, the dhcp client will be started.
+	
+dhcpd.h contains the other two compile time options:
+	
+	LEASE_TIME: The default lease time if not specified in the config
+	file.
+	
+	DHCPD_CONFIG_FILE: The defualt config file to use.
+	
+options.c contains a set of dhcp options for the client:
+
+	name[10]: The name of the option as it will appear in scripts
+	
+	flags: The type of option, as well as if it will be requested
+	by the client (OPTION_REQ)
+
+	code: The DHCP code for this option
+
+busybox drop-in
+--------------
+udhcp is now a drop-in component for busybox (http://busybox.net).
+To update busybox to the latest revision, simply do a:
+
+cp *.[ch] README AUTHORS COPYING ChangeLog TODO \ 
+	<busybox_source>/networking/udhcp
+
+The only two files udhcp does not provide are config.in and
+Makefile.in, so these may need to be updated from time to time.

networking/udhcp/TODO

@@ -0,0 +1,17 @@
+TODO
+----
++ make failure of reading functions revert to previous value, not the default
++ sanity code for option[OPT_LEN]
++ fix aliasing (ie: eth0:0)
++ DONE: Make sure get_raw_packet only accepts packets on the specified interface
++ better standard linux distro support
++ DONE: make config file a command line option for server
++ IMPLEMENTED: make forking a command line option
++ make sure packet generation works on a wide varitey of arches
++ Interoperability testing
++ Hooks within the DHCP server
++ Additional bootp support in client/server
++ Make serverid option in server configurable
++ DONE: cause client to generate DHCP_VENDOR option
++ Possibly add failure message to DHCP NAK
++ Possibly log DHCP NAK failure message in client

networking/udhcp/arpping.c

@@ -0,0 +1,105 @@
+/*
+ * arpping.c
+ *
+ * Mostly stolen from: dhcpcd - DHCP client daemon
+ * by Yoichi Hariguchi <yoichi@fore.com>
+ */
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/if_ether.h>
+#include <net/if_arp.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "dhcpd.h"
+#include "debug.h"
+#include "arpping.h"
+
+/* args:	yiaddr - what IP to ping
+ *		ip - our ip
+ *		mac - our arp address
+ *		interface - interface to use
+ * retn: 	1 addr free
+ *		0 addr used
+ *		-1 error 
+ */  
+
+/* FIXME: match response against chaddr */
+int arpping(u_int32_t yiaddr, u_int32_t ip, unsigned char *mac, char *interface)
+{
+
+	int	timeout = 2;
+	int 	optval = 1;
+	int	s;			/* socket */
+	int	rv = 1;			/* return value */
+	struct sockaddr addr;		/* for interface name */
+	struct arpMsg	arp;
+	fd_set		fdset;
+	struct timeval	tm;
+	time_t		prevTime;
+
+
+	if ((s = socket (PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP))) == -1) {
+		LOG(LOG_ERR, "Could not open raw socket");
+		return -1;
+	}
+	
+	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &optval, sizeof(optval)) == -1) {
+		LOG(LOG_ERR, "Could not setsocketopt on raw socket");
+		close(s);
+		return -1;
+	}
+
+	/* send arp request */
+	memset(&arp, 0, sizeof(arp));
+	memcpy(arp.ethhdr.h_dest, MAC_BCAST_ADDR, 6);	/* MAC DA */
+	memcpy(arp.ethhdr.h_source, mac, 6);		/* MAC SA */
+	arp.ethhdr.h_proto = htons(ETH_P_ARP);		/* protocol type (Ethernet) */
+	arp.htype = htons(ARPHRD_ETHER);		/* hardware type */
+	arp.ptype = htons(ETH_P_IP);			/* protocol type (ARP message) */
+	arp.hlen = 6;					/* hardware address length */
+	arp.plen = 4;					/* protocol address length */
+	arp.operation = htons(ARPOP_REQUEST);		/* ARP op code */
+	*((u_int *) arp.sInaddr) = ip;			/* source IP address */
+	memcpy(arp.sHaddr, mac, 6);			/* source hardware address */
+	*((u_int *) arp.tInaddr) = yiaddr;		/* target IP address */
+	
+	memset(&addr, 0, sizeof(addr));
+	strcpy(addr.sa_data, interface);
+	if (sendto(s, &arp, sizeof(arp), 0, &addr, sizeof(addr)) < 0)
+		rv = 0;
+	
+	/* wait arp reply, and check it */
+	tm.tv_usec = 0;
+	time(&prevTime);
+	while (timeout > 0) {
+		FD_ZERO(&fdset);
+		FD_SET(s, &fdset);
+		tm.tv_sec = timeout;
+		if (select(s + 1, &fdset, (fd_set *) NULL, (fd_set *) NULL, &tm) < 0) {
+			DEBUG(LOG_ERR, "Error on ARPING request: %s", strerror(errno));
+			if (errno != EINTR) rv = 0;
+		} else if (FD_ISSET(s, &fdset)) {
+			if (recv(s, &arp, sizeof(arp), 0) < 0 ) rv = 0;
+			if (arp.operation == htons(ARPOP_REPLY) && 
+			    bcmp(arp.tHaddr, mac, 6) == 0 && 
+			    *((u_int *) arp.sInaddr) == yiaddr) {
+				DEBUG(LOG_INFO, "Valid arp reply receved for this address");
+				rv = 0;
+				break;
+			}
+		}
+		timeout -= time(NULL) - prevTime;
+		time(&prevTime);
+	}
+	close(s);
+	DEBUG(LOG_INFO, "%salid arp replies for this address", rv ? "No v" : "V");	 
+	return rv;
+}

networking/udhcp/arpping.h

@@ -0,0 +1,30 @@
+/*
+ * arpping .h
+ */
+
+#ifndef ARPPING_H
+#define ARPPING_H
+
+#include <netinet/if_ether.h>
+#include <net/if_arp.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+struct arpMsg {
+	struct ethhdr ethhdr;	 		/* Ethernet header */
+	u_short htype;				/* hardware type (must be ARPHRD_ETHER) */
+	u_short ptype;				/* protocol type (must be ETH_P_IP) */
+	u_char  hlen;				/* hardware address length (must be 6) */
+	u_char  plen;				/* protocol address length (must be 4) */
+	u_short operation;			/* ARP opcode */
+	u_char  sHaddr[6];			/* sender's hardware address */
+	u_char  sInaddr[4];			/* sender's IP address */
+	u_char  tHaddr[6];			/* target's hardware address */
+	u_char  tInaddr[4];			/* target's IP address */
+	u_char  pad[18];			/* pad for min. Ethernet payload (60 bytes) */
+};
+
+/* function prototypes */
+int arpping(u_int32_t yiaddr, u_int32_t ip, unsigned char *arp, char *interface);
+
+#endif

networking/udhcp/clientpacket.c

@@ -0,0 +1,239 @@
+/* clientpacket.c
+ *
+ * Packet generation and dispatching functions for the DHCP client.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+ 
+#include <string.h>
+#include <sys/socket.h>
+#include <features.h>
+#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#else
+#include <asm/types.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#endif
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+
+#include "dhcpd.h"
+#include "packet.h"
+#include "options.h"
+#include "dhcpc.h"
+#include "debug.h"
+
+
+/* Create a random xid */
+unsigned long random_xid(void)
+{
+	static int initialized;
+	if (!initialized) {
+		srand(time(0));
+		initialized++;
+	}
+	return rand();
+}
+
+
+/* initialize a packet with the proper defaults */
+static void init_packet(struct dhcpMessage *packet, char type)
+{
+	struct vendor  {
+		char vendor, length;
+		char str[sizeof("udhcp "VERSION)];
+	} vendor_id = { DHCP_VENDOR,  sizeof("udhcp "VERSION) - 1, "udhcp "VERSION};
+	
+	init_header(packet, type);
+	memcpy(packet->chaddr, client_config.arp, 6);
+	add_option_string(packet->options, client_config.clientid);
+	if (client_config.hostname) add_option_string(packet->options, client_config.hostname);
+	add_option_string(packet->options, (unsigned char *) &vendor_id);
+}
+
+
+/* Add a paramater request list for stubborn DHCP servers. Pull the data
+ * from the struct in options.c. Don't do bounds checking here because it
+ * goes towards the head of the packet. */
+static void add_requests(struct dhcpMessage *packet)
+{
+	int end = end_option(packet->options);
+	int i, len = 0;
+
+	packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
+	for (i = 0; options[i].code; i++)
+		if (options[i].flags & OPTION_REQ)
+			packet->options[end + OPT_DATA + len++] = options[i].code;
+	packet->options[end + OPT_LEN] = len;
+	packet->options[end + OPT_DATA + len] = DHCP_END;
+
+}
+
+
+/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
+int send_discover(unsigned long xid, unsigned long requested)
+{
+	struct dhcpMessage packet;
+
+	init_packet(&packet, DHCPDISCOVER);
+	packet.xid = xid;
+	if (requested)
+		add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
+
+	add_requests(&packet);
+	LOG(LOG_DEBUG, "Sending discover...");
+	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST, 
+				SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+}
+
+
+/* Broadcasts a DHCP request message */
+int send_selecting(unsigned long xid, unsigned long server, unsigned long requested)
+{
+	struct dhcpMessage packet;
+	struct in_addr addr;
+
+	init_packet(&packet, DHCPREQUEST);
+	packet.xid = xid;
+
+	add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
+	add_simple_option(packet.options, DHCP_SERVER_ID, server);
+	
+	add_requests(&packet);
+	addr.s_addr = requested;
+	LOG(LOG_DEBUG, "Sending select for %s...", inet_ntoa(addr));
+	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST, 
+				SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+}
+
+
+/* Unicasts or broadcasts a DHCP renew message */
+int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr)
+{
+	struct dhcpMessage packet;
+	int ret = 0;
+
+	init_packet(&packet, DHCPREQUEST);
+	packet.xid = xid;
+	packet.ciaddr = ciaddr;
+
+	add_requests(&packet);
+	LOG(LOG_DEBUG, "Sending renew...");
+	if (server) 
+		ret = kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
+	else ret = raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
+				SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
+	return ret;
+}	
+
+
+/* Unicasts a DHCP release message */
+int send_release(unsigned long server, unsigned long ciaddr)
+{
+	struct dhcpMessage packet;
+
+	init_packet(&packet, DHCPRELEASE);
+	packet.xid = random_xid();
+	packet.ciaddr = ciaddr;
+	
+	add_simple_option(packet.options, DHCP_REQUESTED_IP, ciaddr);
+	add_simple_option(packet.options, DHCP_SERVER_ID, server);
+
+	LOG(LOG_DEBUG, "Sending release...");
+	return kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);
+}
+
+
+/* return -1 on errors that are fatal for the socket, -2 for those that aren't */
+int get_raw_packet(struct dhcpMessage *payload, int fd)
+{
+	int bytes;
+	struct udp_dhcp_packet packet;
+	u_int32_t source, dest;
+	u_int16_t check;
+
+	memset(&packet, 0, sizeof(struct udp_dhcp_packet));
+	bytes = read(fd, &packet, sizeof(struct udp_dhcp_packet));
+	if (bytes < 0) {
+		DEBUG(LOG_INFO, "couldn't read on raw listening socket -- ignoring");
+		usleep(500000); /* possible down interface, looping condition */
+		return -1;
+	}
+	
+	if (bytes < (int) (sizeof(struct iphdr) + sizeof(struct udphdr))) {
+		DEBUG(LOG_INFO, "message too short, ignoring");
+		return -2;
+	}
+	
+	if (bytes < ntohs(packet.ip.tot_len)) {
+		DEBUG(LOG_INFO, "Truncated packet");
+		return -2;
+	}
+	
+	/* ignore any extra garbage bytes */
+	bytes = ntohs(packet.ip.tot_len);
+	
+	/* Make sure its the right packet for us, and that it passes sanity checks */
+	if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION ||
+	    packet.ip.ihl != sizeof(packet.ip) >> 2 || packet.udp.dest != htons(CLIENT_PORT) ||
+	    bytes > (int) sizeof(struct udp_dhcp_packet) ||
+	    ntohs(packet.udp.len) != (short) (bytes - sizeof(packet.ip))) {
+	    	DEBUG(LOG_INFO, "unrelated/bogus packet");
+	    	return -2;
+	}
+
+	/* check IP checksum */
+	check = packet.ip.check;
+	packet.ip.check = 0;
+	if (check != checksum(&(packet.ip), sizeof(packet.ip))) {
+		DEBUG(LOG_INFO, "bad IP header checksum, ignoring");
+		return -1;
+	}
+	
+	/* verify the UDP checksum by replacing the header with a psuedo header */
+	source = packet.ip.saddr;
+	dest = packet.ip.daddr;
+	check = packet.udp.check;
+	packet.udp.check = 0;
+	memset(&packet.ip, 0, sizeof(packet.ip));
+
+	packet.ip.protocol = IPPROTO_UDP;
+	packet.ip.saddr = source;
+	packet.ip.daddr = dest;
+	packet.ip.tot_len = packet.udp.len; /* cheat on the psuedo-header */
+	if (check && check != checksum(&packet, bytes)) {
+		DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
+		return -2;
+	}
+	
+	memcpy(payload, &(packet.data), bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
+	
+	if (ntohl(payload->cookie) != DHCP_MAGIC) {
+		LOG(LOG_ERR, "received bogus message (bad magic) -- ignoring");
+		return -2;
+	}
+	DEBUG(LOG_INFO, "oooooh!!! got some!");
+	return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
+	
+}
+

networking/udhcp/clientpacket.h

@@ -0,0 +1,12 @@
+#ifndef _CLIENTPACKET_H
+#define _CLIENTPACKET_H
+
+unsigned long random_xid(void);
+int send_discover(unsigned long xid, unsigned long requested);
+int send_selecting(unsigned long xid, unsigned long server, unsigned long requested);
+int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr);
+int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr);
+int send_release(unsigned long server, unsigned long ciaddr);
+int get_raw_packet(struct dhcpMessage *payload, int fd);
+
+#endif

networking/udhcp/config.in

@@ -0,0 +1,18 @@
+#
+# For a description of the syntax of this configuration file,
+# see scripts/kbuild/config-language.txt.
+#
+
+mainmenu_option next_comment
+comment 'udhcp Server/Client'
+
+bool 'udhcp Server (udhcpd)'			CONFIG_UDHCPD
+bool 'udhcp Client (udhcpc)'			CONFIG_UDHCPC
+bool 'Lease display utility (dumpleases)'	CONFIG_DUMPLEASES
+if [ "$CONFIG_UDHCPD" = "y" -o "$CONFIG_UDHCPC" = "y" ]; then
+    bool '  Log udhcp messages to syslog (instead of stdout)' CONFIG_FEATURE_UDHCP_SYSLOG
+    bool '  Compile udhcp with noisy debugging messages' CONFIG_FEATURE_UDHCP_DEBUG  
+fi
+
+endmenu
+

networking/udhcp/debug.h

@@ -0,0 +1,41 @@
+#ifndef _DEBUG_H
+#define _DEBUG_H
+
+#include "libbb_udhcp.h"
+
+#include <stdio.h>
+#ifdef SYSLOG
+#include <syslog.h>
+#endif
+
+
+#ifdef SYSLOG
+# define LOG(level, str, args...) do { printf(str, ## args); \
+				printf("\n"); \
+				syslog(level, str, ## args); } while(0)
+# define OPEN_LOG(name) openlog(name, 0, 0)
+#define CLOSE_LOG() closelog()
+#else
+# define LOG_EMERG	"EMERGENCY!"
+# define LOG_ALERT	"ALERT!"
+# define LOG_CRIT	"critical!"
+# define LOG_WARNING	"warning"
+# define LOG_ERR	"error"
+# define LOG_INFO	"info"
+# define LOG_DEBUG	"debug"
+# define LOG(level, str, args...) do { printf("%s, ", level); \
+				printf(str, ## args); \
+				printf("\n"); } while(0)
+# define OPEN_LOG(name) do {;} while(0)
+#define CLOSE_LOG() do {;} while(0)
+#endif
+
+#ifdef DEBUG
+# undef DEBUG
+# define DEBUG(level, str, args...) LOG(level, str, ## args)
+# define DEBUGGING
+#else
+# define DEBUG(level, str, args...) do {;} while(0)
+#endif
+
+#endif

networking/udhcp/dhcpc.c

@@ -0,0 +1,559 @@
+/* dhcpc.c
+ *
+ * udhcp DHCP client
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+ 
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <signal.h>
+#include <time.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <errno.h>
+
+#include "dhcpd.h"
+#include "dhcpc.h"
+#include "options.h"
+#include "clientpacket.h"
+#include "packet.h"
+#include "script.h"
+#include "socket.h"
+#include "debug.h"
+#include "pidfile.h"
+
+static int state;
+static unsigned long requested_ip; /* = 0 */
+static unsigned long server_addr;
+static unsigned long timeout;
+static int packet_num; /* = 0 */
+static int fd;
+static int signal_pipe[2];
+
+#define LISTEN_NONE 0
+#define LISTEN_KERNEL 1
+#define LISTEN_RAW 2
+static int listen_mode;
+
+#define DEFAULT_SCRIPT	"/usr/share/udhcpc/default.script"
+
+struct client_config_t client_config = {
+	/* Default options. */
+	abort_if_no_lease: 0,
+	foreground: 0,
+	quit_after_lease: 0,
+	background_if_no_lease: 0,
+	interface: "eth0",
+	pidfile: NULL,
+	script: DEFAULT_SCRIPT,
+	clientid: NULL,
+	hostname: NULL,
+	ifindex: 0,
+	arp: "\0\0\0\0\0\0",		/* appease gcc-3.0 */
+};
+
+#ifndef BB_VER
+static void show_usage(void)
+{
+	printf(
+"Usage: udhcpc [OPTIONS]\n\n"
+"  -c, --clientid=CLIENTID         Client identifier\n"
+"  -H, --hostname=HOSTNAME         Client hostname\n"
+"  -h                              Alias for -H\n"
+"  -f, --foreground                Do not fork after getting lease\n"
+"  -b, --background                Fork to background if lease cannot be\n"
+"                                  immediately negotiated.\n"
+"  -i, --interface=INTERFACE       Interface to use (default: eth0)\n"
+"  -n, --now                       Exit with failure if lease cannot be\n"
+"                                  immediately negotiated.\n"
+"  -p, --pidfile=file              Store process ID of daemon in file\n"
+"  -q, --quit                      Quit after obtaining lease\n"
+"  -r, --request=IP                IP address to request (default: none)\n"
+"  -s, --script=file               Run file at dhcp events (default:\n"
+"                                  " DEFAULT_SCRIPT ")\n"
+"  -v, --version                   Display version\n"
+	);
+	exit(0);
+}
+#endif
+
+
+/* just a little helper */
+static void change_mode(int new_mode)
+{
+	DEBUG(LOG_INFO, "entering %s listen mode",
+		new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
+	close(fd);
+	fd = -1;
+	listen_mode = new_mode;
+}
+
+
+/* perform a renew */
+static void perform_renew(void)
+{
+	LOG(LOG_INFO, "Performing a DHCP renew");
+	switch (state) {
+	case RENEWING:
+		run_script(NULL, "deconfig");
+	case BOUND:
+	case REBINDING:
+		change_mode(LISTEN_KERNEL);
+		state = RENEW_REQUESTED;
+		break;
+	case RENEW_REQUESTED:
+	case REQUESTING:
+	case RELEASED:
+		change_mode(LISTEN_RAW);
+		state = INIT_SELECTING;
+		break;
+	case INIT_SELECTING:
+	}
+
+	/* start things over */
+	packet_num = 0;
+
+	/* Kill any timeouts because the user wants this to hurry along */
+	timeout = 0;
+}
+
+
+/* perform a release */
+static void perform_release(void)
+{
+	char buffer[16];
+	struct in_addr temp_addr;
+
+	/* send release packet */
+	if (state == BOUND || state == RENEWING || state == REBINDING) {
+		temp_addr.s_addr = server_addr;
+		sprintf(buffer, "%s", inet_ntoa(temp_addr));
+		temp_addr.s_addr = requested_ip;
+		LOG(LOG_INFO, "Unicasting a release of %s to %s", 
+				inet_ntoa(temp_addr), buffer);
+		send_release(server_addr, requested_ip); /* unicast */
+		run_script(NULL, "deconfig");
+	}
+	LOG(LOG_INFO, "Entering released state");
+
+	change_mode(LISTEN_NONE);
+	state = RELEASED;
+	timeout = 0x7fffffff;
+}
+
+
+/* Exit and cleanup */
+static void exit_client(int retval)
+{
+	pidfile_delete(client_config.pidfile);
+	CLOSE_LOG();
+	exit(retval);
+}
+
+
+/* Signal handler */
+static void signal_handler(int sig)
+{
+	if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
+		LOG(LOG_ERR, "Could not send signal: %s",
+			strerror(errno));
+	}
+}
+
+
+static void background(void)
+{
+	int pid_fd;
+
+	pid_fd = pidfile_acquire(client_config.pidfile); /* hold lock during fork. */
+	while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */
+	if (daemon(0, 0) == -1) {
+		perror("fork");
+		exit_client(1);
+	}
+	client_config.foreground = 1; /* Do not fork again. */
+	pidfile_write_release(pid_fd);
+}
+
+
+#ifdef COMBINED_BINARY
+int udhcpc_main(int argc, char *argv[])
+#else
+int main(int argc, char *argv[])
+#endif
+{
+	unsigned char *temp, *message;
+	unsigned long t1 = 0, t2 = 0, xid = 0;
+	unsigned long start = 0, lease;
+	fd_set rfds;
+	int retval;
+	struct timeval tv;
+	int c, len;
+	struct dhcpMessage packet;
+	struct in_addr temp_addr;
+	int pid_fd;
+	time_t now;
+	int max_fd;
+	int sig;
+
+	static struct option arg_options[] = {
+		{"clientid",	required_argument,	0, 'c'},
+		{"foreground",	no_argument,		0, 'f'},
+		{"background",	no_argument,		0, 'b'},
+		{"hostname",	required_argument,	0, 'H'},
+		{"hostname",    required_argument,      0, 'h'},
+		{"interface",	required_argument,	0, 'i'},
+		{"now", 	no_argument,		0, 'n'},
+		{"pidfile",	required_argument,	0, 'p'},
+		{"quit",	no_argument,		0, 'q'},
+		{"request",	required_argument,	0, 'r'},
+		{"script",	required_argument,	0, 's'},
+		{"version",	no_argument,		0, 'v'},
+		{"help",	no_argument,		0, '?'},
+		{0, 0, 0, 0}
+	};
+
+	/* get options */
+	while (1) {
+		int option_index = 0;
+		c = getopt_long(argc, argv, "c:fbH:h:i:np:qr:s:v", arg_options, &option_index);
+		if (c == -1) break;
+		
+		switch (c) {
+		case 'c':
+			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+			if (client_config.clientid) free(client_config.clientid);
+			client_config.clientid = xmalloc(len + 2);
+			client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
+			client_config.clientid[OPT_LEN] = len;
+			client_config.clientid[OPT_DATA] = '\0';
+			strncpy(client_config.clientid + OPT_DATA, optarg, len);
+			break;
+		case 'f':
+			client_config.foreground = 1;
+			break;
+		case 'b':
+			client_config.background_if_no_lease = 1;
+			break;
+		case 'h':
+		case 'H':
+			len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+			if (client_config.hostname) free(client_config.hostname);
+			client_config.hostname = xmalloc(len + 2);
+			client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
+			client_config.hostname[OPT_LEN] = len;
+			strncpy(client_config.hostname + 2, optarg, len);
+			break;
+		case 'i':
+			client_config.interface =  optarg;
+			break;
+		case 'n':
+			client_config.abort_if_no_lease = 1;
+			break;
+		case 'p':
+			client_config.pidfile = optarg;
+			break;
+		case 'q':
+			client_config.quit_after_lease = 1;
+			break;
+		case 'r':
+			requested_ip = inet_addr(optarg);
+			break;
+		case 's':
+			client_config.script = optarg;
+			break;
+		case 'v':
+			printf("udhcpcd, version %s\n\n", VERSION);
+			exit_client(0);
+			break;
+		default:
+			show_usage();
+		}
+	}
+
+	OPEN_LOG("udhcpc");
+	LOG(LOG_INFO, "udhcp client (v%s) started", VERSION);
+
+	pid_fd = pidfile_acquire(client_config.pidfile);
+	pidfile_write_release(pid_fd);
+
+	if (read_interface(client_config.interface, &client_config.ifindex, 
+			   NULL, client_config.arp) < 0)
+		exit_client(1);
+		
+	if (!client_config.clientid) {
+		client_config.clientid = xmalloc(6 + 3);
+		client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
+		client_config.clientid[OPT_LEN] = 7;
+		client_config.clientid[OPT_DATA] = 1;
+		memcpy(client_config.clientid + 3, client_config.arp, 6);
+	}
+
+	/* setup signal handlers */
+	socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
+	signal(SIGUSR1, signal_handler);
+	signal(SIGUSR2, signal_handler);
+	signal(SIGTERM, signal_handler);
+	
+	state = INIT_SELECTING;
+	run_script(NULL, "deconfig");
+	change_mode(LISTEN_RAW);
+
+	for (;;) {
+
+		tv.tv_sec = timeout - time(0);
+		tv.tv_usec = 0;
+		FD_ZERO(&rfds);
+
+		if (listen_mode != LISTEN_NONE && fd < 0) {
+			if (listen_mode == LISTEN_KERNEL)
+				fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
+			else
+				fd = raw_socket(client_config.ifindex);
+			if (fd < 0) {
+				LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s", strerror(errno));
+				exit_client(0);
+			}
+		}
+		if (fd >= 0) FD_SET(fd, &rfds);
+		FD_SET(signal_pipe[0], &rfds);		
+
+		if (tv.tv_sec > 0) {
+			DEBUG(LOG_INFO, "Waiting on select...\n");
+			max_fd = signal_pipe[0] > fd ? signal_pipe[0] : fd;
+			retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
+		} else retval = 0; /* If we already timed out, fall through */
+
+		now = time(0);
+		if (retval == 0) {
+			/* timeout dropped to zero */
+			switch (state) {
+			case INIT_SELECTING:
+				if (packet_num < 3) {
+					if (packet_num == 0)
+						xid = random_xid();
+
+					/* send discover packet */
+					send_discover(xid, requested_ip); /* broadcast */
+					
+					timeout = now + ((packet_num == 2) ? 4 : 2);
+					packet_num++;
+				} else {
+					if (client_config.background_if_no_lease) {
+						LOG(LOG_INFO, "No lease, forking to background.");
+						background();
+					} else if (client_config.abort_if_no_lease) {
+						LOG(LOG_INFO, "No lease, failing.");
+						exit_client(1);
+				  	}
+					/* wait to try again */
+					packet_num = 0;
+					timeout = now + 60;
+				}
+				break;
+			case RENEW_REQUESTED:
+			case REQUESTING:
+				if (packet_num < 3) {
+					/* send request packet */
+					if (state == RENEW_REQUESTED)
+						send_renew(xid, server_addr, requested_ip); /* unicast */
+					else send_selecting(xid, server_addr, requested_ip); /* broadcast */
+					
+					timeout = now + ((packet_num == 2) ? 10 : 2);
+					packet_num++;
+				} else {
+					/* timed out, go back to init state */
+					state = INIT_SELECTING;
+					timeout = now;
+					packet_num = 0;
+					change_mode(LISTEN_RAW);
+				}
+				break;
+			case BOUND:
+				/* Lease is starting to run out, time to enter renewing state */
+				state = RENEWING;
+				change_mode(LISTEN_KERNEL);
+				DEBUG(LOG_INFO, "Entering renew state");
+				/* fall right through */
+			case RENEWING:
+				/* Either set a new T1, or enter REBINDING state */
+				if ((t2 - t1) <= (lease / 14400 + 1)) {
+					/* timed out, enter rebinding state */
+					state = REBINDING;
+					timeout = now + (t2 - t1);
+					DEBUG(LOG_INFO, "Entering rebinding state");
+				} else {
+					/* send a request packet */
+					send_renew(xid, server_addr, requested_ip); /* unicast */
+					
+					t1 = (t2 - t1) / 2 + t1;
+					timeout = t1 + start;
+				}
+				break;
+			case REBINDING:
+				/* Either set a new T2, or enter INIT state */
+				if ((lease - t2) <= (lease / 14400 + 1)) {
+					/* timed out, enter init state */
+					state = INIT_SELECTING;
+					LOG(LOG_INFO, "Lease lost, entering init state");
+					run_script(NULL, "deconfig");
+					timeout = now;
+					packet_num = 0;
+					change_mode(LISTEN_RAW);
+				} else {
+					/* send a request packet */
+					send_renew(xid, 0, requested_ip); /* broadcast */
+
+					t2 = (lease - t2) / 2 + t2;
+					timeout = t2 + start;
+				}
+				break;
+			case RELEASED:
+				/* yah, I know, *you* say it would never happen */
+				timeout = 0x7fffffff;
+				break;
+			}
+		} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
+			/* a packet is ready, read it */
+			
+			if (listen_mode == LISTEN_KERNEL)
+				len = get_packet(&packet, fd);
+			else len = get_raw_packet(&packet, fd);
+			
+			if (len == -1 && errno != EINTR) {
+				DEBUG(LOG_INFO, "error on read, %s, reopening socket", strerror(errno));
+				change_mode(listen_mode); /* just close and reopen */
+			}
+			if (len < 0) continue;
+			
+			if (packet.xid != xid) {
+				DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
+					(unsigned long) packet.xid, xid);
+				continue;
+			}
+			
+			if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
+				DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
+				continue;
+			}
+			
+			switch (state) {
+			case INIT_SELECTING:
+				/* Must be a DHCPOFFER to one of our xid's */
+				if (*message == DHCPOFFER) {
+					if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
+						memcpy(&server_addr, temp, 4);
+						xid = packet.xid;
+						requested_ip = packet.yiaddr;
+						
+						/* enter requesting state */
+						state = REQUESTING;
+						timeout = now;
+						packet_num = 0;
+					} else {
+						DEBUG(LOG_ERR, "No server ID in message");
+					}
+				}
+				break;
+			case RENEW_REQUESTED:
+			case REQUESTING:
+			case RENEWING:
+			case REBINDING:
+				if (*message == DHCPACK) {
+					if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
+						LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
+						lease = 60 * 60;
+					} else {
+						memcpy(&lease, temp, 4);
+						lease = ntohl(lease);
+					}
+						
+					/* enter bound state */
+					t1 = lease / 2;
+					
+					/* little fixed point for n * .875 */
+					t2 = (lease * 0x7) >> 3;
+					temp_addr.s_addr = packet.yiaddr;
+					LOG(LOG_INFO, "Lease of %s obtained, lease time %ld", 
+						inet_ntoa(temp_addr), lease);
+					start = now;
+					timeout = t1 + start;
+					requested_ip = packet.yiaddr;
+					run_script(&packet,
+						   ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
+
+					state = BOUND;
+					change_mode(LISTEN_NONE);
+					if (client_config.quit_after_lease) 
+						exit_client(0);
+					if (!client_config.foreground)
+						background();
+
+				} else if (*message == DHCPNAK) {
+					/* return to init state */
+					LOG(LOG_INFO, "Received DHCP NAK");
+					run_script(&packet, "nak");
+					if (state != REQUESTING)
+						run_script(NULL, "deconfig");
+					state = INIT_SELECTING;
+					timeout = now;
+					requested_ip = 0;
+					packet_num = 0;
+					change_mode(LISTEN_RAW);
+					sleep(3); /* avoid excessive network traffic */
+				}
+				break;
+			/* case BOUND, RELEASED: - ignore all packets */
+			}	
+		} else if (retval > 0 && FD_ISSET(signal_pipe[0], &rfds)) {
+			if (read(signal_pipe[0], &sig, sizeof(signal)) < 0) {
+				DEBUG(LOG_ERR, "Could not read signal: %s", 
+					strerror(errno));
+				continue; /* probably just EINTR */
+			}
+			switch (sig) {
+			case SIGUSR1: 
+				perform_renew();
+				break;
+			case SIGUSR2:
+				perform_release();
+				break;
+			case SIGTERM:
+				LOG(LOG_INFO, "Received SIGTERM");
+				exit_client(0);
+			}
+		} else if (retval == -1 && errno == EINTR) {
+			/* a signal was caught */		
+		} else {
+			/* An error occured */
+			DEBUG(LOG_ERR, "Error on select");
+		}
+		
+	}
+	return 0;
+}
+

networking/udhcp/dhcpc.h

@@ -0,0 +1,34 @@
+/* dhcpc.h */
+#ifndef _DHCPC_H
+#define _DHCPC_H
+
+#include "libbb_udhcp.h"
+
+#define INIT_SELECTING	0
+#define REQUESTING	1
+#define BOUND		2
+#define RENEWING	3
+#define REBINDING	4
+#define INIT_REBOOT	5
+#define RENEW_REQUESTED 6
+#define RELEASED	7
+
+
+struct client_config_t {
+	char foreground;		/* Do not fork */
+	char quit_after_lease;		/* Quit after obtaining lease */
+	char abort_if_no_lease;		/* Abort if no lease */
+	char background_if_no_lease;	/* Fork to background if no lease */
+	char *interface;		/* The name of the interface to use */
+	char *pidfile;			/* Optionally store the process ID */
+	char *script;			/* User script to run at dhcp events */
+	unsigned char *clientid;	/* Optional client id to use */
+	unsigned char *hostname;	/* Optional hostname to use */
+	int ifindex;			/* Index number of the interface to use */
+	unsigned char arp[6];		/* Our arp address */
+};
+
+extern struct client_config_t client_config;
+
+
+#endif

networking/udhcp/dhcpd.c

@@ -0,0 +1,287 @@
+/* dhcpd.c
+ *
+ * udhcp Server
+ * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
+ *			Chris Trew <ctrew@moreton.com.au>
+ *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <signal.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <sys/time.h>
+
+#include "debug.h"
+#include "dhcpd.h"
+#include "arpping.h"
+#include "socket.h"
+#include "options.h"
+#include "files.h"
+#include "leases.h"
+#include "packet.h"
+#include "serverpacket.h"
+#include "pidfile.h"
+
+
+/* globals */
+struct dhcpOfferedAddr *leases;
+struct server_config_t server_config;
+static int signal_pipe[2];
+
+/* Exit and cleanup */
+static void exit_server(int retval)
+{
+	pidfile_delete(server_config.pidfile);
+	CLOSE_LOG();
+	exit(retval);
+}
+
+
+/* Signal handler */
+static void signal_handler(int sig)
+{
+	if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
+		LOG(LOG_ERR, "Could not send signal: %s", 
+			strerror(errno));
+	}
+}
+
+
+#ifdef COMBINED_BINARY	
+int udhcpd_main(int argc, char *argv[])
+#else
+int main(int argc, char *argv[])
+#endif
+{	
+	fd_set rfds;
+	struct timeval tv;
+	int server_socket = -1;
+	int bytes, retval;
+	struct dhcpMessage packet;
+	unsigned char *state;
+	unsigned char *server_id, *requested;
+	u_int32_t server_id_align, requested_align;
+	unsigned long timeout_end;
+	struct option_set *option;
+	struct dhcpOfferedAddr *lease;
+	int pid_fd;
+	int max_sock;
+	int sig;
+	
+	OPEN_LOG("udhcpd");
+	LOG(LOG_INFO, "udhcp server (v%s) started", VERSION);
+
+	memset(&server_config, 0, sizeof(struct server_config_t));
+	
+	if (argc < 2)
+		read_config(DHCPD_CONF_FILE);
+	else read_config(argv[1]);
+
+	pid_fd = pidfile_acquire(server_config.pidfile);
+	pidfile_write_release(pid_fd);
+
+	if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) {
+		memcpy(&server_config.lease, option->data + 2, 4);
+		server_config.lease = ntohl(server_config.lease);
+	}
+	else server_config.lease = LEASE_TIME;
+	
+	leases = malloc(sizeof(struct dhcpOfferedAddr) * server_config.max_leases);
+	memset(leases, 0, sizeof(struct dhcpOfferedAddr) * server_config.max_leases);
+	read_leases(server_config.lease_file);
+
+	if (read_interface(server_config.interface, &server_config.ifindex,
+			   &server_config.server, server_config.arp) < 0)
+		exit_server(1);
+
+#ifndef DEBUGGING
+	pid_fd = pidfile_acquire(server_config.pidfile); /* hold lock during fork. */
+	if (daemon(0, 0) == -1) {
+		perror("fork");
+		exit_server(1);
+	}
+	pidfile_write_release(pid_fd);
+#endif
+
+
+	socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
+	signal(SIGUSR1, signal_handler);
+	signal(SIGTERM, signal_handler);
+
+	timeout_end = time(0) + server_config.auto_time;
+	while(1) { /* loop until universe collapses */
+
+		if (server_socket < 0)
+			if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) {
+				LOG(LOG_ERR, "FATAL: couldn't create server socket, %s", strerror(errno));
+				exit_server(0);
+			}			
+
+		FD_ZERO(&rfds);
+		FD_SET(server_socket, &rfds);
+		FD_SET(signal_pipe[0], &rfds);
+		if (server_config.auto_time) {
+			tv.tv_sec = timeout_end - time(0);
+			tv.tv_usec = 0;
+		}
+		if (!server_config.auto_time || tv.tv_sec > 0) {
+			max_sock = server_socket > signal_pipe[0] ? server_socket : signal_pipe[0];
+			retval = select(max_sock + 1, &rfds, NULL, NULL, 
+					server_config.auto_time ? &tv : NULL);
+		} else retval = 0; /* If we already timed out, fall through */
+
+		if (retval == 0) {
+			write_leases();
+			timeout_end = time(0) + server_config.auto_time;
+			continue;
+		} else if (retval < 0 && errno != EINTR) {
+			DEBUG(LOG_INFO, "error on select");
+			continue;
+		}
+		
+		if (FD_ISSET(signal_pipe[0], &rfds)) {
+			if (read(signal_pipe[0], &sig, sizeof(sig)) < 0)
+				continue; /* probably just EINTR */
+			switch (sig) {
+			case SIGUSR1:
+				LOG(LOG_INFO, "Received a SIGUSR1");
+				write_leases();
+				/* why not just reset the timeout, eh */
+				timeout_end = time(0) + server_config.auto_time;
+				continue;
+			case SIGTERM:
+				LOG(LOG_INFO, "Received a SIGTERM");
+				exit_server(0);
+			}
+		}
+
+		if ((bytes = get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */
+			if (bytes == -1 && errno != EINTR) {
+				DEBUG(LOG_INFO, "error on read, %s, reopening socket", strerror(errno));
+				close(server_socket);
+				server_socket = -1;
+			}
+			continue;
+		}
+
+		if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
+			DEBUG(LOG_ERR, "couldn't get option from packet, ignoring");
+			continue;
+		}
+		
+		/* ADDME: look for a static lease */
+		lease = find_lease_by_chaddr(packet.chaddr);
+		switch (state[0]) {
+		case DHCPDISCOVER:
+			DEBUG(LOG_INFO,"received DISCOVER");
+			
+			if (sendOffer(&packet) < 0) {
+				LOG(LOG_ERR, "send OFFER failed");
+			}
+			break;			
+ 		case DHCPREQUEST:
+			DEBUG(LOG_INFO, "received REQUEST");
+
+			requested = get_option(&packet, DHCP_REQUESTED_IP);
+			server_id = get_option(&packet, DHCP_SERVER_ID);
+
+			if (requested) memcpy(&requested_align, requested, 4);
+			if (server_id) memcpy(&server_id_align, server_id, 4);
+		
+			if (lease) { /*ADDME: or static lease */
+				if (server_id) {
+					/* SELECTING State */
+					DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align));
+					if (server_id_align == server_config.server && requested && 
+					    requested_align == lease->yiaddr) {
+						sendACK(&packet, lease->yiaddr);
+					}
+				} else {
+					if (requested) {
+						/* INIT-REBOOT State */
+						if (lease->yiaddr == requested_align)
+							sendACK(&packet, lease->yiaddr);
+						else sendNAK(&packet);
+					} else {
+						/* RENEWING or REBINDING State */
+						if (lease->yiaddr == packet.ciaddr)
+							sendACK(&packet, lease->yiaddr);
+						else {
+							/* don't know what to do!!!! */
+							sendNAK(&packet);
+						}
+					}						
+				}
+			
+			/* what to do if we have no record of the client */
+			} else if (server_id) {
+				/* SELECTING State */
+
+			} else if (requested) {
+				/* INIT-REBOOT State */
+				if ((lease = find_lease_by_yiaddr(requested_align))) {
+					if (lease_expired(lease)) {
+						/* probably best if we drop this lease */
+						memset(lease->chaddr, 0, 16);
+					/* make some contention for this address */
+					} else sendNAK(&packet);
+				} else if (requested_align < server_config.start || 
+					   requested_align > server_config.end) {
+					sendNAK(&packet);
+				} /* else remain silent */
+
+			} else {
+				 /* RENEWING or REBINDING State */
+			}
+			break;
+		case DHCPDECLINE:
+			DEBUG(LOG_INFO,"received DECLINE");
+			if (lease) {
+				memset(lease->chaddr, 0, 16);
+				lease->expires = time(0) + server_config.decline_time;
+			}			
+			break;
+		case DHCPRELEASE:
+			DEBUG(LOG_INFO,"received RELEASE");
+			if (lease) lease->expires = time(0);
+			break;
+		case DHCPINFORM:
+			DEBUG(LOG_INFO,"received INFORM");
+			send_inform(&packet);
+			break;	
+		default:
+			LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
+		}
+	}
+
+	return 0;
+}
+

networking/udhcp/dhcpd.h

@@ -0,0 +1,131 @@
+/* dhcpd.h */
+#ifndef _DHCPD_H
+#define _DHCPD_H
+
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+
+#include "libbb_udhcp.h"
+#include "leases.h"
+
+/************************************/
+/* Defaults _you_ may want to tweak */
+/************************************/
+
+/* the period of time the client is allowed to use that address */
+#define LEASE_TIME              (60*60*24*10) /* 10 days of seconds */
+
+/* where to find the DHCP server configuration file */
+#define DHCPD_CONF_FILE         "/etc/udhcpd.conf"
+
+/*****************************************************************/
+/* Do not modify below here unless you know what you are doing!! */
+/*****************************************************************/
+
+/* DHCP protocol -- see RFC 2131 */
+#define SERVER_PORT		67
+#define CLIENT_PORT		68
+
+#define DHCP_MAGIC		0x63825363
+
+/* DHCP option codes (partial list) */
+#define DHCP_PADDING		0x00
+#define DHCP_SUBNET		0x01
+#define DHCP_TIME_OFFSET	0x02
+#define DHCP_ROUTER		0x03
+#define DHCP_TIME_SERVER	0x04
+#define DHCP_NAME_SERVER	0x05
+#define DHCP_DNS_SERVER		0x06
+#define DHCP_LOG_SERVER		0x07
+#define DHCP_COOKIE_SERVER	0x08
+#define DHCP_LPR_SERVER		0x09
+#define DHCP_HOST_NAME		0x0c
+#define DHCP_BOOT_SIZE		0x0d
+#define DHCP_DOMAIN_NAME	0x0f
+#define DHCP_SWAP_SERVER	0x10
+#define DHCP_ROOT_PATH		0x11
+#define DHCP_IP_TTL		0x17
+#define DHCP_MTU		0x1a
+#define DHCP_BROADCAST		0x1c
+#define DHCP_NTP_SERVER		0x2a
+#define DHCP_WINS_SERVER	0x2c
+#define DHCP_REQUESTED_IP	0x32
+#define DHCP_LEASE_TIME		0x33
+#define DHCP_OPTION_OVER	0x34
+#define DHCP_MESSAGE_TYPE	0x35
+#define DHCP_SERVER_ID		0x36
+#define DHCP_PARAM_REQ		0x37
+#define DHCP_MESSAGE		0x38
+#define DHCP_MAX_SIZE		0x39
+#define DHCP_T1			0x3a
+#define DHCP_T2			0x3b
+#define DHCP_VENDOR		0x3c
+#define DHCP_CLIENT_ID		0x3d
+
+#define DHCP_END		0xFF
+
+
+#define BOOTREQUEST		1
+#define BOOTREPLY		2
+
+#define ETH_10MB		1
+#define ETH_10MB_LEN		6
+
+#define DHCPDISCOVER		1
+#define DHCPOFFER		2
+#define DHCPREQUEST		3
+#define DHCPDECLINE		4
+#define DHCPACK			5
+#define DHCPNAK			6
+#define DHCPRELEASE		7
+#define DHCPINFORM		8
+
+#define BROADCAST_FLAG		0x8000
+
+#define OPTION_FIELD		0
+#define FILE_FIELD		1
+#define SNAME_FIELD		2
+
+/* miscellaneous defines */
+#define MAC_BCAST_ADDR		(unsigned char *) "\xff\xff\xff\xff\xff\xff"
+#define OPT_CODE 0
+#define OPT_LEN 1
+#define OPT_DATA 2
+
+struct option_set {
+	unsigned char *data;
+	struct option_set *next;
+};
+
+struct server_config_t {
+	u_int32_t server;		/* Our IP, in network order */
+	u_int32_t start;		/* Start address of leases, network order */
+	u_int32_t end;			/* End of leases, network order */
+	struct option_set *options;	/* List of DHCP options loaded from the config file */
+	char *interface;		/* The name of the interface to use */
+	int ifindex;			/* Index number of the interface to use */
+	unsigned char arp[6];		/* Our arp address */
+	unsigned long lease;		/* lease time in seconds (host order) */
+	unsigned long max_leases; 	/* maximum number of leases (including reserved address) */
+	char remaining; 		/* should the lease file be interpreted as lease time remaining, or
+			 		 * as the time the lease expires */
+	unsigned long auto_time; 	/* how long should udhcpd wait before writing a config file.
+					 * if this is zero, it will only write one on SIGUSR1 */
+	unsigned long decline_time; 	/* how long an address is reserved if a client returns a
+				    	 * decline message */
+	unsigned long conflict_time; 	/* how long an arp conflict offender is leased for */
+	unsigned long offer_time; 	/* how long an offered address is reserved */
+	unsigned long min_lease; 	/* minimum lease a client can request*/
+	char *lease_file;
+	char *pidfile;
+	char *notify_file;		/* What to run whenever leases are written */
+	u_int32_t siaddr;		/* next server bootp option */
+	char *sname;			/* bootp server name */
+	char *boot_file;		/* bootp boot file option */
+};	
+
+extern struct server_config_t server_config;
+extern struct dhcpOfferedAddr *leases;
+		
+
+#endif

networking/udhcp/dumpleases.c

@@ -0,0 +1,112 @@
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <signal.h>
+#include <errno.h>
+#include <getopt.h>
+#include <time.h>
+
+#include "libbb_udhcp.h"
+
+#define REMAINING 0
+#define ABSOLUTE 1
+
+struct lease_t {
+	unsigned char chaddr[16];
+	u_int32_t yiaddr;
+	u_int32_t expires;
+};
+
+#ifdef BB_VER
+int dumpleases_main(int argc, char *argv[])
+#else
+int main(int argc, char *argv[])
+#endif
+{
+	FILE *fp;
+	int i, c, mode = REMAINING;
+	long expires;
+	char file[255] = "/var/lib/misc/udhcpd.leases";
+	struct lease_t lease;
+	struct in_addr addr;
+	
+	static struct option options[] = {
+		{"absolute", 0, 0, 'a'},
+		{"remaining", 0, 0, 'r'},
+		{"file", 1, 0, 'f'},
+		{"help", 0, 0, 'h'},
+		{0, 0, 0, 0}
+	};
+
+	while (1) {
+		int option_index = 0;
+		c = getopt_long(argc, argv, "arf:h", options, &option_index);
+		if (c == -1) break;
+		
+		switch (c) {
+		case 'a': mode = ABSOLUTE; break;
+		case 'r': mode = REMAINING; break;
+		case 'f':
+			strncpy(file, optarg, 255);
+			file[254] = '\0';
+			break;
+		case 'h':
+			printf("Usage: dumpleases -f <file> -[r|a]\n\n");
+			printf("  -f, --file=FILENAME             Leases file to load\n");
+			printf("  -r, --remaining                 Interepret lease times as time remaing\n");
+			printf("  -a, --absolute                  Interepret lease times as expire time\n");
+			break;
+		}
+	}
+			
+	if (!(fp = fopen(file, "r"))) {
+		perror("could not open input file");
+		return 0;
+	}
+
+	printf("Mac Address       IP-Address      Expires %s\n", mode == REMAINING ? "in" : "at");  
+	/*     "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
+	while (fread(&lease, sizeof(lease), 1, fp)) {
+
+		for (i = 0; i < 6; i++) {
+			printf("%02x", lease.chaddr[i]);
+			if (i != 5) printf(":");
+		}
+		addr.s_addr = lease.yiaddr;
+		printf(" %-15s", inet_ntoa(addr));
+		expires = ntohl(lease.expires);
+		printf(" ");
+		if (mode == REMAINING) {
+			if (!expires) printf("expired\n");
+			else {
+				if (expires > 60*60*24) {
+					printf("%ld days, ", expires / (60*60*24));
+					expires %= 60*60*24;
+				}
+				if (expires > 60*60) {
+					printf("%ld hours, ", expires / (60*60));
+					expires %= 60*60;
+				}
+				if (expires > 60) {
+					printf("%ld minutes, ", expires / 60);
+					expires %= 60;
+				}
+				printf("%ld seconds\n", expires);
+			}
+		} else printf("%s", ctime(&expires));
+	}
+	fclose(fp);
+	
+	return 0;
+}

networking/udhcp/files.c

@@ -0,0 +1,284 @@
+/* 
+ * files.c -- DHCP server file manipulation *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+ 
+#include <stdio.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <ctype.h>
+#include <netdb.h>
+
+#include "debug.h"
+#include "dhcpd.h"
+#include "files.h"
+#include "options.h"
+#include "leases.h"
+
+/* on these functions, make sure you datatype matches */
+static int read_ip(char *line, void *arg)
+{
+	struct in_addr *addr = arg;
+	struct hostent *host;
+	int retval = 1;
+
+	if (!inet_aton(line, addr)) {
+		if ((host = gethostbyname(line))) 
+			addr->s_addr = *((unsigned long *) host->h_addr_list[0]);
+		else retval = 0;
+	}
+	return retval;
+}
+
+
+static int read_str(char *line, void *arg)
+{
+	char **dest = arg;
+	
+	if (*dest) free(*dest);
+	*dest = strdup(line);
+	
+	return 1;
+}
+
+
+static int read_u32(char *line, void *arg)
+{
+	u_int32_t *dest = arg;
+	char *endptr;
+	*dest = strtoul(line, &endptr, 0);
+	return endptr[0] == '\0';
+}
+
+
+static int read_yn(char *line, void *arg)
+{
+	char *dest = arg;
+	int retval = 1;
+
+	if (!strcasecmp("yes", line))
+		*dest = 1;
+	else if (!strcasecmp("no", line))
+		*dest = 0;
+	else retval = 0;
+	
+	return retval;
+}
+
+
+/* read a dhcp option and add it to opt_list */
+static int read_opt(char *line, void *arg)
+{
+	struct option_set **opt_list = arg;
+	char *opt, *val, *endptr;
+	struct dhcp_option *option = NULL;
+	int retval = 0, length = 0;
+	char buffer[255];
+	u_int16_t result_u16;
+	u_int32_t result_u32;
+	int i;
+
+	if (!(opt = strtok(line, " \t="))) return 0;
+	
+	for (i = 0; options[i].code; i++)
+		if (!strcmp(options[i].name, opt))
+			option = &(options[i]);
+		
+	if (!option) return 0;
+	
+	do {
+		val = strtok(NULL, ", \t");
+		if (val) {
+			length = option_lengths[option->flags & TYPE_MASK];
+			retval = 0;
+			switch (option->flags & TYPE_MASK) {
+			case OPTION_IP:
+				retval = read_ip(val, buffer);
+				break;
+			case OPTION_IP_PAIR:
+				retval = read_ip(val, buffer);
+				if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
+				if (retval) retval = read_ip(val, buffer + 4);
+				break;
+			case OPTION_STRING:
+				length = strlen(val);
+				if (length > 0) {
+					if (length > 254) length = 254;
+					memcpy(buffer, val, length);
+					retval = 1;
+				}
+				break;
+			case OPTION_BOOLEAN:
+				retval = read_yn(val, buffer);
+				break;
+			case OPTION_U8:
+				buffer[0] = strtoul(val, &endptr, 0);
+				retval = (endptr[0] == '\0');
+				break;
+			case OPTION_U16:
+				result_u16 = htons(strtoul(val, &endptr, 0));
+				memcpy(buffer, &result_u16, 2);
+				retval = (endptr[0] == '\0');
+				break;
+			case OPTION_S16:
+				result_u16 = htons(strtol(val, &endptr, 0));
+				memcpy(buffer, &result_u16, 2);
+				retval = (endptr[0] == '\0');
+				break;
+			case OPTION_U32:
+				result_u32 = htonl(strtoul(val, &endptr, 0));
+				memcpy(buffer, &result_u32, 4);
+				retval = (endptr[0] == '\0');
+				break;
+			case OPTION_S32:
+				result_u32 = htonl(strtol(val, &endptr, 0));	
+				memcpy(buffer, &result_u32, 4);
+				retval = (endptr[0] == '\0');
+				break;
+			default:
+				break;
+			}
+			if (retval) 
+				attach_option(opt_list, option, buffer, length);
+		};
+	} while (val && retval && option->flags & OPTION_LIST);
+	return retval;
+}
+
+
+static struct config_keyword keywords[] = {
+	/* keyword[14]	handler   variable address		default[20] */
+	{"start",	read_ip,  &(server_config.start),	"192.168.0.20"},
+	{"end",		read_ip,  &(server_config.end),		"192.168.0.254"},
+	{"interface",	read_str, &(server_config.interface),	"eth0"},
+	{"option",	read_opt, &(server_config.options),	""},
+	{"opt",		read_opt, &(server_config.options),	""},
+	{"max_leases",	read_u32, &(server_config.max_leases),	"254"},
+	{"remaining",	read_yn,  &(server_config.remaining),	"yes"},
+	{"auto_time",	read_u32, &(server_config.auto_time),	"7200"},
+	{"decline_time",read_u32, &(server_config.decline_time),"3600"},
+	{"conflict_time",read_u32,&(server_config.conflict_time),"3600"},
+	{"offer_time",	read_u32, &(server_config.offer_time),	"60"},
+	{"min_lease",	read_u32, &(server_config.min_lease),	"60"},
+	{"lease_file",	read_str, &(server_config.lease_file),	"/var/lib/misc/udhcpd.leases"},
+	{"pidfile",	read_str, &(server_config.pidfile),	"/var/run/udhcpd.pid"},
+	{"notify_file", read_str, &(server_config.notify_file),	""},
+	{"siaddr",	read_ip,  &(server_config.siaddr),	"0.0.0.0"},
+	{"sname",	read_str, &(server_config.sname),	""},
+	{"boot_file",	read_str, &(server_config.boot_file),	""},
+	/*ADDME: static lease */
+	{"",		NULL, 	  NULL,				""}
+};
+
+
+int read_config(char *file)
+{
+	FILE *in;
+	char buffer[80], orig[80], *token, *line;
+	int i;
+
+	for (i = 0; strlen(keywords[i].keyword); i++)
+		if (strlen(keywords[i].def))
+			keywords[i].handler(keywords[i].def, keywords[i].var);
+
+	if (!(in = fopen(file, "r"))) {
+		LOG(LOG_ERR, "unable to open config file: %s", file);
+		return 0;
+	}
+	
+	while (fgets(buffer, 80, in)) {
+		if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
+		strncpy(orig, buffer, 80);
+		if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
+		token = buffer + strspn(buffer, " \t");
+		if (*token == '\0') continue;
+		line = token + strcspn(token, " \t=");
+		if (*line == '\0') continue;
+		*line = '\0';
+		line++;
+		
+		/* eat leading whitespace */
+		line = line + strspn(line, " \t=");
+		/* eat trailing whitespace */
+		for (i = strlen(line); i > 0 && isspace(line[i - 1]); i--);
+		line[i] = '\0';
+		
+		for (i = 0; strlen(keywords[i].keyword); i++)
+			if (!strcasecmp(token, keywords[i].keyword))
+				if (!keywords[i].handler(line, keywords[i].var)) {
+					LOG(LOG_ERR, "unable to parse '%s'", orig);
+					/* reset back to the default value */
+					keywords[i].handler(keywords[i].def, keywords[i].var);
+				}
+	}
+	fclose(in);
+	return 1;
+}
+
+
+void write_leases(void)
+{
+	FILE *fp;
+	unsigned int i;
+	char buf[255];
+	time_t curr = time(0);
+	unsigned long lease_time;
+	
+	if (!(fp = fopen(server_config.lease_file, "w"))) {
+		LOG(LOG_ERR, "Unable to open %s for writing", server_config.lease_file);
+		return;
+	}
+	
+	for (i = 0; i < server_config.max_leases; i++) {
+		if (leases[i].yiaddr != 0) {
+			if (server_config.remaining) {
+				if (lease_expired(&(leases[i])))
+					lease_time = 0;
+				else lease_time = leases[i].expires - curr;
+			} else lease_time = leases[i].expires;
+			lease_time = htonl(lease_time);
+			fwrite(leases[i].chaddr, 16, 1, fp);
+			fwrite(&(leases[i].yiaddr), 4, 1, fp);
+			fwrite(&lease_time, 4, 1, fp);
+		}
+	}
+	fclose(fp);
+	
+	if (server_config.notify_file) {
+		sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
+		system(buf);
+	}
+}
+
+
+void read_leases(char *file)
+{
+	FILE *fp;
+	unsigned int i = 0;
+	struct dhcpOfferedAddr lease;
+	
+	if (!(fp = fopen(file, "r"))) {
+		LOG(LOG_ERR, "Unable to open %s for reading", file);
+		return;
+	}
+	
+	while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
+		/* ADDME: is it a static lease */
+		if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
+			lease.expires = ntohl(lease.expires);
+			if (!server_config.remaining) lease.expires -= time(0);
+			if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
+				LOG(LOG_WARNING, "Too many leases while loading %s\n", file);
+				break;
+			}				
+			i++;
+		}
+	}
+	DEBUG(LOG_INFO, "Read %d leases", i);
+	fclose(fp);
+}
+		
+		

networking/udhcp/files.h

@@ -0,0 +1,17 @@
+/* files.h */
+#ifndef _FILES_H
+#define _FILES_H
+
+struct config_keyword {
+	char keyword[14];
+	int (*handler)(char *line, void *var);
+	void *var;
+	char def[30];
+};
+
+
+int read_config(char *file);
+void write_leases(void);
+void read_leases(char *file);
+
+#endif

networking/udhcp/frontend.c

@@ -0,0 +1,16 @@
+#include <string.h>
+
+extern int udhcpd_main(int argc, char *argv[]);
+extern int udhcpc_main(int argc, char *argv[]);
+
+int main(int argc, char *argv[])
+{
+	int ret = 0;
+	char *base = strrchr(argv[0], '/');
+	
+	if (strstr(base ? (base + 1) : argv[0], "dhcpd"))
+		ret = udhcpd_main(argc, argv);
+	else ret = udhcpc_main(argc, argv);
+	
+	return ret;
+}

networking/udhcp/leases.c

@@ -0,0 +1,151 @@
+/* 
+ * leases.c -- tools to manage DHCP leases 
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+
+#include <time.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "debug.h"
+#include "dhcpd.h"
+#include "files.h"
+#include "options.h"
+#include "leases.h"
+#include "arpping.h"
+
+unsigned char blank_chaddr[] = {[0 ... 15] = 0};
+
+/* clear every lease out that chaddr OR yiaddr matches and is nonzero */
+void clear_lease(u_int8_t *chaddr, u_int32_t yiaddr)
+{
+	unsigned int i, j;
+	
+	for (j = 0; j < 16 && !chaddr[j]; j++);
+	
+	for (i = 0; i < server_config.max_leases; i++)
+		if ((j != 16 && !memcmp(leases[i].chaddr, chaddr, 16)) ||
+		    (yiaddr && leases[i].yiaddr == yiaddr)) {
+			memset(&(leases[i]), 0, sizeof(struct dhcpOfferedAddr));
+		}
+}
+
+
+/* add a lease into the table, clearing out any old ones */
+struct dhcpOfferedAddr *add_lease(u_int8_t *chaddr, u_int32_t yiaddr, unsigned long lease)
+{
+	struct dhcpOfferedAddr *oldest;
+	
+	/* clean out any old ones */
+	clear_lease(chaddr, yiaddr);
+		
+	oldest = oldest_expired_lease();
+	
+	if (oldest) {
+		memcpy(oldest->chaddr, chaddr, 16);
+		oldest->yiaddr = yiaddr;
+		oldest->expires = time(0) + lease;
+	}
+	
+	return oldest;
+}
+
+
+/* true if a lease has expired */
+int lease_expired(struct dhcpOfferedAddr *lease)
+{
+	return (lease->expires < (unsigned long) time(0));
+}	
+
+
+/* Find the oldest expired lease, NULL if there are no expired leases */
+struct dhcpOfferedAddr *oldest_expired_lease(void)
+{
+	struct dhcpOfferedAddr *oldest = NULL;
+	unsigned long oldest_lease = time(0);
+	unsigned int i;
+
+	
+	for (i = 0; i < server_config.max_leases; i++)
+		if (oldest_lease > leases[i].expires) {
+			oldest_lease = leases[i].expires;
+			oldest = &(leases[i]);
+		}
+	return oldest;
+		
+}
+
+
+/* Find the first lease that matches chaddr, NULL if no match */
+struct dhcpOfferedAddr *find_lease_by_chaddr(u_int8_t *chaddr)
+{
+	unsigned int i;
+
+	for (i = 0; i < server_config.max_leases; i++)
+		if (!memcmp(leases[i].chaddr, chaddr, 16)) return &(leases[i]);
+	
+	return NULL;
+}
+
+
+/* Find the first lease that matches yiaddr, NULL is no match */
+struct dhcpOfferedAddr *find_lease_by_yiaddr(u_int32_t yiaddr)
+{
+	unsigned int i;
+
+	for (i = 0; i < server_config.max_leases; i++)
+		if (leases[i].yiaddr == yiaddr) return &(leases[i]);
+	
+	return NULL;
+}
+
+
+/* find an assignable address, it check_expired is true, we check all the expired leases as well.
+ * Maybe this should try expired leases by age... */
+u_int32_t find_address(int check_expired) 
+{
+	u_int32_t addr, ret;
+	struct dhcpOfferedAddr *lease = NULL;		
+
+	addr = ntohl(server_config.start); /* addr is in host order here */
+	for (;addr <= ntohl(server_config.end); addr++) {
+
+		/* ie, 192.168.55.0 */
+		if (!(addr & 0xFF)) continue;
+
+		/* ie, 192.168.55.255 */
+		if ((addr & 0xFF) == 0xFF) continue;
+
+		/* lease is not taken */
+		ret = htonl(addr);
+		if ((!(lease = find_lease_by_yiaddr(ret)) ||
+
+		     /* or it expired and we are checking for expired leases */
+		     (check_expired  && lease_expired(lease))) &&
+
+		     /* and it isn't on the network */
+	    	     !check_ip(ret)) {
+			return ret;
+			break;
+		}
+	}
+	return 0;
+}
+
+
+/* check is an IP is taken, if it is, add it to the lease table */
+int check_ip(u_int32_t addr)
+{
+	struct in_addr temp;
+	
+	if (arpping(addr, server_config.server, server_config.arp, server_config.interface) == 0) {
+		temp.s_addr = addr;
+	 	LOG(LOG_INFO, "%s belongs to someone, reserving it for %ld seconds", 
+	 		inet_ntoa(temp), server_config.conflict_time);
+		add_lease(blank_chaddr, addr, server_config.conflict_time);
+		return 1;
+	} else return 0;
+}
+

networking/udhcp/leases.h

@@ -0,0 +1,24 @@
+/* leases.h */
+#ifndef _LEASES_H
+#define _LEASES_H
+
+
+struct dhcpOfferedAddr {
+	u_int8_t chaddr[16];
+	u_int32_t yiaddr;	/* network order */
+	u_int32_t expires;	/* host order */
+};
+
+extern unsigned char blank_chaddr[];
+
+void clear_lease(u_int8_t *chaddr, u_int32_t yiaddr);
+struct dhcpOfferedAddr *add_lease(u_int8_t *chaddr, u_int32_t yiaddr, unsigned long lease);
+int lease_expired(struct dhcpOfferedAddr *lease);
+struct dhcpOfferedAddr *oldest_expired_lease(void);
+struct dhcpOfferedAddr *find_lease_by_chaddr(u_int8_t *chaddr);
+struct dhcpOfferedAddr *find_lease_by_yiaddr(u_int32_t yiaddr);
+u_int32_t find_address(int check_expired);
+int check_ip(u_int32_t addr);
+
+
+#endif

networking/udhcp/libbb_udhcp.h

@@ -0,0 +1,29 @@
+/* libbb_udhcp.h - busybox compatability wrapper */
+
+#ifndef _LIBBB_UDHCP_H
+#define _LIBBB_UDHCP_H
+
+#ifdef BB_VER
+#include "libbb.h"
+
+#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
+#define SYSLOG
+#endif
+
+#ifdef CONFIG_FEATURE_UDHCP_DEBUG
+#define DEBUG
+#endif
+
+#define COMBINED_BINARY
+#define VERSION "0.9.8-pre"
+
+#else /* ! BB_VER */
+
+#define TRUE			1
+#define FALSE			0
+
+#define xmalloc malloc
+
+#endif /* BB_VER */
+
+#endif /* _LIBBB_UDHCP_H */

networking/udhcp/options.c

@@ -0,0 +1,230 @@
+/* 
+ * options.c -- DHCP server option packet tools 
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+ 
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "debug.h"
+#include "dhcpd.h"
+#include "files.h"
+#include "options.h"
+#include "leases.h"
+
+
+/* supported options are easily added here */
+struct dhcp_option options[] = {
+	/* name[10]	flags					code */
+	{"subnet",	OPTION_IP | OPTION_REQ,			0x01},
+	{"timezone",	OPTION_S32,				0x02},
+	{"router",	OPTION_IP | OPTION_LIST | OPTION_REQ,	0x03},
+	{"timesvr",	OPTION_IP | OPTION_LIST,		0x04},
+	{"namesvr",	OPTION_IP | OPTION_LIST,		0x05},
+	{"dns",		OPTION_IP | OPTION_LIST | OPTION_REQ,	0x06},
+	{"logsvr",	OPTION_IP | OPTION_LIST,		0x07},
+	{"cookiesvr",	OPTION_IP | OPTION_LIST,		0x08},
+	{"lprsvr",	OPTION_IP | OPTION_LIST,		0x09},
+	{"hostname",	OPTION_STRING | OPTION_REQ,		0x0c},
+	{"bootsize",	OPTION_U16,				0x0d},
+	{"domain",	OPTION_STRING | OPTION_REQ,		0x0f},
+	{"swapsvr",	OPTION_IP,				0x10},
+	{"rootpath",	OPTION_STRING,				0x11},
+	{"ipttl",	OPTION_U8,				0x17},
+	{"mtu",		OPTION_U16,				0x1a},
+	{"broadcast",	OPTION_IP | OPTION_REQ,			0x1c},
+	{"ntpsrv",	OPTION_IP | OPTION_LIST,		0x2a},
+	{"wins",	OPTION_IP | OPTION_LIST,		0x2c},
+	{"requestip",	OPTION_IP,				0x32},
+	{"lease",	OPTION_U32,				0x33},
+	{"dhcptype",	OPTION_U8,				0x35},
+	{"serverid",	OPTION_IP,				0x36},
+	{"message",	OPTION_STRING,				0x38},
+	{"tftp",	OPTION_STRING,				0x42},
+	{"bootfile",	OPTION_STRING,				0x43},
+	{"",		0x00,				0x00}
+};
+
+/* Lengths of the different option types */
+int option_lengths[] = {
+	[OPTION_IP] =		4,
+	[OPTION_IP_PAIR] =	8,
+	[OPTION_BOOLEAN] =	1,
+	[OPTION_STRING] =	1,
+	[OPTION_U8] =		1,
+	[OPTION_U16] =		2,
+	[OPTION_S16] =		2,
+	[OPTION_U32] =		4,
+	[OPTION_S32] =		4
+};
+
+
+/* get an option with bounds checking (warning, not aligned). */
+unsigned char *get_option(struct dhcpMessage *packet, int code)
+{
+	int i, length;
+	unsigned char *optionptr;
+	int over = 0, done = 0, curr = OPTION_FIELD;
+	
+	optionptr = packet->options;
+	i = 0;
+	length = 308;
+	while (!done) {
+		if (i >= length) {
+			LOG(LOG_WARNING, "bogus packet, option fields too long.");
+			return NULL;
+		}
+		if (optionptr[i + OPT_CODE] == code) {
+			if (i + 1 + optionptr[i + OPT_LEN] >= length) {
+				LOG(LOG_WARNING, "bogus packet, option fields too long.");
+				return NULL;
+			}
+			return optionptr + i + 2;
+		}			
+		switch (optionptr[i + OPT_CODE]) {
+		case DHCP_PADDING:
+			i++;
+			break;
+		case DHCP_OPTION_OVER:
+			if (i + 1 + optionptr[i + OPT_LEN] >= length) {
+				LOG(LOG_WARNING, "bogus packet, option fields too long.");
+				return NULL;
+			}
+			over = optionptr[i + 3];
+			i += optionptr[OPT_LEN] + 2;
+			break;
+		case DHCP_END:
+			if (curr == OPTION_FIELD && over & FILE_FIELD) {
+				optionptr = packet->file;
+				i = 0;
+				length = 128;
+				curr = FILE_FIELD;
+			} else if (curr == FILE_FIELD && over & SNAME_FIELD) {
+				optionptr = packet->sname;
+				i = 0;
+				length = 64;
+				curr = SNAME_FIELD;
+			} else done = 1;
+			break;
+		default:
+			i += optionptr[OPT_LEN + i] + 2;
+		}
+	}
+	return NULL;
+}
+
+
+/* return the position of the 'end' option (no bounds checking) */
+int end_option(unsigned char *optionptr) 
+{
+	int i = 0;
+	
+	while (optionptr[i] != DHCP_END) {
+		if (optionptr[i] == DHCP_PADDING) i++;
+		else i += optionptr[i + OPT_LEN] + 2;
+	}
+	return i;
+}
+
+
+/* add an option string to the options (an option string contains an option code,
+ * length, then data) */
+int add_option_string(unsigned char *optionptr, unsigned char *string)
+{
+	int end = end_option(optionptr);
+	
+	/* end position + string length + option code/length + end option */
+	if (end + string[OPT_LEN] + 2 + 1 >= 308) {
+		LOG(LOG_ERR, "Option 0x%02x did not fit into the packet!", string[OPT_CODE]);
+		return 0;
+	}
+	DEBUG(LOG_INFO, "adding option 0x%02x", string[OPT_CODE]);
+	memcpy(optionptr + end, string, string[OPT_LEN] + 2);
+	optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
+	return string[OPT_LEN] + 2;
+}
+
+
+/* add a one to four byte option to a packet */
+int add_simple_option(unsigned char *optionptr, unsigned char code, u_int32_t data)
+{
+	char length = 0;
+	int i;
+	unsigned char option[2 + 4];
+	unsigned char *u8;
+	u_int16_t *u16;
+	u_int32_t *u32;
+	u_int32_t aligned;
+	u8 = (unsigned char *) &aligned;
+	u16 = (u_int16_t *) &aligned;
+	u32 = &aligned;
+
+	for (i = 0; options[i].code; i++)
+		if (options[i].code == code) {
+			length = option_lengths[options[i].flags & TYPE_MASK];
+		}
+		
+	if (!length) {
+		DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
+		return 0;
+	}
+	
+	option[OPT_CODE] = code;
+	option[OPT_LEN] = length;
+
+	switch (length) {
+		case 1: *u8 =  data; break;
+		case 2: *u16 = data; break;
+		case 4: *u32 = data; break;
+	}
+	memcpy(option + 2, &aligned, length);
+	return add_option_string(optionptr, option);
+}
+
+
+/* find option 'code' in opt_list */
+struct option_set *find_option(struct option_set *opt_list, char code)
+{
+	while (opt_list && opt_list->data[OPT_CODE] < code)
+		opt_list = opt_list->next;
+
+	if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list;
+	else return NULL;
+}
+
+
+/* add an option to the opt_list */
+void attach_option(struct option_set **opt_list, struct dhcp_option *option, char *buffer, int length)
+{
+	struct option_set *existing, *new, **curr;
+
+	/* add it to an existing option */
+	if ((existing = find_option(*opt_list, option->code))) {
+		DEBUG(LOG_INFO, "Attaching option %s to existing member of list", option->name);
+		if (option->flags & OPTION_LIST) {
+			if (existing->data[OPT_LEN] + length <= 255) {
+				existing->data = realloc(existing->data, 
+						existing->data[OPT_LEN] + length + 2);
+				memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
+				existing->data[OPT_LEN] += length;
+			} /* else, ignore the data, we could put this in a second option in the future */
+		} /* else, ignore the new data */
+	} else {
+		DEBUG(LOG_INFO, "Attaching option %s to list", option->name);
+		
+		/* make a new option */
+		new = malloc(sizeof(struct option_set));
+		new->data = malloc(length + 2);
+		new->data[OPT_CODE] = option->code;
+		new->data[OPT_LEN] = length;
+		memcpy(new->data + 2, buffer, length);
+		
+		curr = opt_list;
+		while (*curr && (*curr)->data[OPT_CODE] < option->code)
+			curr = &(*curr)->next;
+			
+		new->next = *curr;
+		*curr = new;		
+	}
+}

networking/udhcp/options.h

@@ -0,0 +1,40 @@
+/* options.h */
+#ifndef _OPTIONS_H
+#define _OPTIONS_H
+
+#include "packet.h"
+
+#define TYPE_MASK	0x0F
+
+enum {
+	OPTION_IP=1,
+	OPTION_IP_PAIR,
+	OPTION_STRING,
+	OPTION_BOOLEAN,
+	OPTION_U8,
+	OPTION_U16,
+	OPTION_S16,
+	OPTION_U32,
+	OPTION_S32
+};
+
+#define OPTION_REQ	0x10 /* have the client request this option */
+#define OPTION_LIST	0x20 /* There can be a list of 1 or more of these */
+
+struct dhcp_option {
+	char name[10];
+	char flags;
+	unsigned char code;
+};
+
+extern struct dhcp_option options[];
+extern int option_lengths[];
+
+unsigned char *get_option(struct dhcpMessage *packet, int code);
+int end_option(unsigned char *optionptr);
+int add_option_string(unsigned char *optionptr, unsigned char *string);
+int add_simple_option(unsigned char *optionptr, unsigned char code, u_int32_t data);
+struct option_set *find_option(struct option_set *opt_list, char code);
+void attach_option(struct option_set **opt_list, struct dhcp_option *option, char *buffer, int length);
+
+#endif

networking/udhcp/packet.c

@@ -0,0 +1,203 @@
+#include <unistd.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <features.h>
+#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#else
+#include <asm/types.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#endif
+#include <errno.h>
+
+#include "packet.h"
+#include "debug.h"
+#include "dhcpd.h"
+#include "options.h"
+
+
+void init_header(struct dhcpMessage *packet, char type)
+{
+	memset(packet, 0, sizeof(struct dhcpMessage));
+	switch (type) {
+	case DHCPDISCOVER:
+	case DHCPREQUEST:
+	case DHCPRELEASE:
+	case DHCPINFORM:
+		packet->op = BOOTREQUEST;
+		break;
+	case DHCPOFFER:
+	case DHCPACK:
+	case DHCPNAK:
+		packet->op = BOOTREPLY;
+	}
+	packet->htype = ETH_10MB;
+	packet->hlen = ETH_10MB_LEN;
+	packet->cookie = htonl(DHCP_MAGIC);
+	packet->options[0] = DHCP_END;
+	add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
+}
+
+
+/* read a packet from socket fd, return -1 on read error, -2 on packet error */
+int get_packet(struct dhcpMessage *packet, int fd)
+{
+	int bytes;
+	int i;
+	const char broken_vendors[][8] = {
+		"MSFT 98",
+		""
+	};
+	char unsigned *vendor;
+
+	memset(packet, 0, sizeof(struct dhcpMessage));
+	bytes = read(fd, packet, sizeof(struct dhcpMessage));
+	if (bytes < 0) {
+		DEBUG(LOG_INFO, "couldn't read on listening socket, ignoring");
+		return -1;
+	}
+
+	if (ntohl(packet->cookie) != DHCP_MAGIC) {
+		LOG(LOG_ERR, "received bogus message, ignoring");
+		return -2;
+	}
+	DEBUG(LOG_INFO, "Received a packet");
+	
+	if (packet->op == BOOTREQUEST && (vendor = get_option(packet, DHCP_VENDOR))) {
+		for (i = 0; broken_vendors[i][0]; i++) {
+			if (vendor[OPT_LEN - 2] == (unsigned char) strlen(broken_vendors[i]) &&
+			    !strncmp(vendor, broken_vendors[i], vendor[OPT_LEN - 2])) {
+			    	DEBUG(LOG_INFO, "broken client (%s), forcing broadcast",
+			    		broken_vendors[i]);
+			    	packet->flags |= htons(BROADCAST_FLAG);
+			}
+		}
+	}
+			    	
+
+	return bytes;
+}
+
+
+u_int16_t checksum(void *addr, int count)
+{
+	/* Compute Internet Checksum for "count" bytes
+	 *         beginning at location "addr".
+	 */
+	register int32_t sum = 0;
+	u_int16_t *source = (u_int16_t *) addr;
+
+	while (count > 1)  {
+		/*  This is the inner loop */
+		sum += *source++;
+		count -= 2;
+	}
+
+	/*  Add left-over byte, if any */
+	if (count > 0) {
+		/* Make sure that the left-over byte is added correctly both
+		 * with little and big endian hosts */
+		u_int16_t tmp = 0;
+		*(unsigned char *) (&tmp) = * (unsigned char *) source;
+		sum += tmp;
+	}
+	/*  Fold 32-bit sum to 16 bits */
+	while (sum >> 16)
+		sum = (sum & 0xffff) + (sum >> 16);
+
+	return ~sum;
+}
+
+
+/* Constuct a ip/udp header for a packet, and specify the source and dest hardware address */
+int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
+		   u_int32_t dest_ip, int dest_port, unsigned char *dest_arp, int ifindex)
+{
+	int fd;
+	int result;
+	struct sockaddr_ll dest;
+	struct udp_dhcp_packet packet;
+
+	if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
+		return -1;
+	}
+	
+	memset(&dest, 0, sizeof(dest));
+	memset(&packet, 0, sizeof(packet));
+	
+	dest.sll_family = AF_PACKET;
+	dest.sll_protocol = htons(ETH_P_IP);
+	dest.sll_ifindex = ifindex;
+	dest.sll_halen = 6;
+	memcpy(dest.sll_addr, dest_arp, 6);
+	if (bind(fd, (struct sockaddr *)&dest, sizeof(struct sockaddr_ll)) < 0) {
+		DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
+		close(fd);
+		return -1;
+	}
+
+	packet.ip.protocol = IPPROTO_UDP;
+	packet.ip.saddr = source_ip;
+	packet.ip.daddr = dest_ip;
+	packet.udp.source = htons(source_port);
+	packet.udp.dest = htons(dest_port);
+	packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage)); /* cheat on the psuedo-header */
+	packet.ip.tot_len = packet.udp.len;
+	memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
+	packet.udp.check = checksum(&packet, sizeof(struct udp_dhcp_packet));
+	
+	packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
+	packet.ip.ihl = sizeof(packet.ip) >> 2;
+	packet.ip.version = IPVERSION;
+	packet.ip.ttl = IPDEFTTL;
+	packet.ip.check = checksum(&(packet.ip), sizeof(packet.ip));
+
+	result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0, (struct sockaddr *) &dest, sizeof(dest));
+	if (result <= 0) {
+		DEBUG(LOG_ERR, "write on socket failed: %s", strerror(errno));
+	}
+	close(fd);
+	return result;
+}
+
+
+/* Let the kernel do all the work for packet generation */
+int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
+		   u_int32_t dest_ip, int dest_port)
+{
+	int n = 1;
+	int fd, result;
+	struct sockaddr_in client;
+	
+	if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
+		return -1;
+	
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1)
+		return -1;
+
+	memset(&client, 0, sizeof(client));
+	client.sin_family = AF_INET;
+	client.sin_port = htons(source_port);
+	client.sin_addr.s_addr = source_ip;
+
+	if (bind(fd, (struct sockaddr *)&client, sizeof(struct sockaddr)) == -1)
+		return -1;
+
+	memset(&client, 0, sizeof(client));
+	client.sin_family = AF_INET;
+	client.sin_port = htons(dest_port);
+	client.sin_addr.s_addr = dest_ip; 
+
+	if (connect(fd, (struct sockaddr *)&client, sizeof(struct sockaddr)) == -1)
+		return -1;
+
+	result = write(fd, payload, sizeof(struct dhcpMessage));
+	close(fd);
+	return result;
+}	
+

networking/udhcp/packet.h

@@ -0,0 +1,41 @@
+#ifndef _PACKET_H
+#define _PACKET_H
+
+#include <netinet/udp.h>
+#include <netinet/ip.h>
+
+struct dhcpMessage {
+	u_int8_t op;
+	u_int8_t htype;
+	u_int8_t hlen;
+	u_int8_t hops;
+	u_int32_t xid;
+	u_int16_t secs;
+	u_int16_t flags;
+	u_int32_t ciaddr;
+	u_int32_t yiaddr;
+	u_int32_t siaddr;
+	u_int32_t giaddr;
+	u_int8_t chaddr[16];
+	u_int8_t sname[64];
+	u_int8_t file[128];
+	u_int32_t cookie;
+	u_int8_t options[308]; /* 312 - cookie */ 
+};
+
+struct udp_dhcp_packet {
+	struct iphdr ip;
+	struct udphdr udp;
+	struct dhcpMessage data;
+};
+
+void init_header(struct dhcpMessage *packet, char type);
+int get_packet(struct dhcpMessage *packet, int fd);
+u_int16_t checksum(void *addr, int count);
+int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
+		   u_int32_t dest_ip, int dest_port, unsigned char *dest_arp, int ifindex);
+int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
+		   u_int32_t dest_ip, int dest_port);
+
+
+#endif

networking/udhcp/pidfile.c

@@ -0,0 +1,69 @@
+/* pidfile.c
+ *
+ * Functions to assist in the writing and removing of pidfiles.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> Soptember 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "debug.h"
+
+int pidfile_acquire(char *pidfile)
+{
+	int pid_fd;
+	if (pidfile == NULL) return -1;
+
+	pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
+	if (pid_fd < 0) {
+		LOG(LOG_ERR, "Unable to open pidfile %s: %s\n",
+		    pidfile, strerror(errno));
+	} else {
+		lockf(pid_fd, F_LOCK, 0);
+	}
+	
+	return pid_fd;
+}
+
+
+void pidfile_write_release(int pid_fd)
+{
+	FILE *out;
+
+	if (pid_fd < 0) return;
+
+	if ((out = fdopen(pid_fd, "w")) != NULL) {
+		fprintf(out, "%d\n", getpid());
+		fclose(out);
+	}
+	lockf(pid_fd, F_UNLCK, 0);
+	close(pid_fd);
+}
+
+
+void pidfile_delete(char *pidfile)
+{
+	if (pidfile) unlink(pidfile);
+}
+
+

networking/udhcp/pidfile.h

@@ -0,0 +1,26 @@
+/* pidfile.h
+ *
+ * Functions to assist in the writing and removing of pidfiles.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> Soptember 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+
+int pidfile_acquire(char *pidfile);
+void pidfile_write_release(int pid_fd);
+void pidfile_delete(char *pidfile);
+

networking/udhcp/script.c

@@ -0,0 +1,228 @@
+/* script.c
+ *
+ * Functions to call the DHCP client notification scripts 
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+#include "options.h"
+#include "dhcpd.h"
+#include "dhcpc.h"
+#include "packet.h"
+#include "options.h"
+#include "debug.h"
+
+/* get a rough idea of how long an option will be (rounding up...) */
+static int max_option_length[] = {
+	[OPTION_IP] =		sizeof("255.255.255.255 "),
+	[OPTION_IP_PAIR] =	sizeof("255.255.255.255 ") * 2,
+	[OPTION_STRING] =	1,
+	[OPTION_BOOLEAN] =	sizeof("yes "),
+	[OPTION_U8] =		sizeof("255 "),
+	[OPTION_U16] =		sizeof("65535 "),
+	[OPTION_S16] =		sizeof("-32768 "),
+	[OPTION_U32] =		sizeof("4294967295 "),
+	[OPTION_S32] =		sizeof("-2147483684 "),
+};
+
+
+static int upper_length(int length, struct dhcp_option *option)
+{
+	return max_option_length[option->flags & TYPE_MASK] *
+	       (length / option_lengths[option->flags & TYPE_MASK]);
+}
+
+
+static int sprintip(char *dest, char *pre, unsigned char *ip) {
+	return sprintf(dest, "%s%d.%d.%d.%d ", pre, ip[0], ip[1], ip[2], ip[3]);
+}
+
+
+/* Fill dest with the text of option 'option'. */
+static void fill_options(char *dest, unsigned char *option, struct dhcp_option *type_p)
+{
+	int type, optlen;
+	u_int16_t val_u16;
+	int16_t val_s16;
+	u_int32_t val_u32;
+	int32_t val_s32;
+	int len = option[OPT_LEN - 2];
+
+	dest += sprintf(dest, "%s=", type_p->name);
+
+	type = type_p->flags & TYPE_MASK;
+	optlen = option_lengths[type];
+	for(;;) {
+		switch (type) {
+		case OPTION_IP_PAIR:
+			dest += sprintip(dest, "", option);
+			*(dest++) = '/';
+			option += 4;
+			optlen = 4;
+		case OPTION_IP:	/* Works regardless of host byte order. */
+			dest += sprintip(dest, "", option);
+ 			break;
+		case OPTION_BOOLEAN:
+			dest += sprintf(dest, *option ? "yes " : "no ");
+			break;
+		case OPTION_U8:
+			dest += sprintf(dest, "%u ", *option);
+			break;
+		case OPTION_U16:
+			memcpy(&val_u16, option, 2);
+			dest += sprintf(dest, "%u ", ntohs(val_u16));
+			break;
+		case OPTION_S16:
+			memcpy(&val_s16, option, 2);
+			dest += sprintf(dest, "%d ", ntohs(val_s16));
+			break;
+		case OPTION_U32:
+			memcpy(&val_u32, option, 4);
+			dest += sprintf(dest, "%lu ", (unsigned long) ntohl(val_u32));
+			break;
+		case OPTION_S32:
+			memcpy(&val_s32, option, 4);
+			dest += sprintf(dest, "%ld ", (long) ntohl(val_s32));
+			break;
+		case OPTION_STRING:
+			memcpy(dest, option, len);
+			dest[len] = '\0';
+			return;	 /* Short circuit this case */
+		}
+		option += optlen;
+		len -= optlen;
+		if (len <= 0) break;
+	}
+}
+
+
+static char *find_env(const char *prefix, char *defaultstr)
+{
+	extern char **environ;
+	char **ptr;
+	const int len = strlen(prefix);
+
+	for (ptr = environ; *ptr != NULL; ptr++) {
+		if (strncmp(prefix, *ptr, len) == 0)
+			return *ptr;
+	}
+	return defaultstr;
+}
+
+
+/* put all the paramaters into an environment */
+static char **fill_envp(struct dhcpMessage *packet)
+{
+	int num_options = 0;
+	int i, j;
+	char **envp;
+	unsigned char *temp;
+	char over = 0;
+
+	if (packet == NULL)
+		num_options = 0;
+	else {
+		for (i = 0; options[i].code; i++)
+			if (get_option(packet, options[i].code))
+				num_options++;
+		if (packet->siaddr) num_options++;
+		if ((temp = get_option(packet, DHCP_OPTION_OVER)))
+			over = *temp;
+		if (!(over & FILE_FIELD) && packet->file[0]) num_options++;
+		if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++;		
+	}
+	
+	envp = xmalloc((num_options + 5) * sizeof(char *));
+	envp[0] = xmalloc(sizeof("interface=") + strlen(client_config.interface));
+	sprintf(envp[0], "interface=%s", client_config.interface);
+	envp[1] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin");
+	envp[2] = find_env("HOME", "HOME=/");
+
+	if (packet == NULL) {
+		envp[3] = NULL;
+		return envp;
+	}
+
+	envp[3] = xmalloc(sizeof("ip=255.255.255.255"));
+	sprintip(envp[3], "ip=", (unsigned char *) &packet->yiaddr);
+	for (i = 0, j = 4; options[i].code; i++) {
+		if ((temp = get_option(packet, options[i].code))) {
+			envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2], &options[i]) + strlen(options[i].name) + 2);
+			fill_options(envp[j], temp, &options[i]);
+			j++;
+		}
+	}
+	if (packet->siaddr) {
+		envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
+		sprintip(envp[j++], "siaddr=", (unsigned char *) &packet->siaddr);
+	}
+	if (!(over & FILE_FIELD) && packet->file[0]) {
+		/* watch out for invalid packets */
+		packet->file[sizeof(packet->file) - 1] = '\0';
+		envp[j] = xmalloc(sizeof("boot_file=") + strlen(packet->file));
+		sprintf(envp[j++], "boot_file=%s", packet->file);
+	}
+	if (!(over & SNAME_FIELD) && packet->sname[0]) {
+		/* watch out for invalid packets */
+		packet->sname[sizeof(packet->sname) - 1] = '\0';
+		envp[j] = xmalloc(sizeof("sname=") + strlen(packet->sname));
+		sprintf(envp[j++], "sname=%s", packet->sname);
+	}	
+	envp[j] = NULL;
+	return envp;
+}
+
+
+/* Call a script with a par file and env vars */
+void run_script(struct dhcpMessage *packet, const char *name)
+{
+	int pid;
+	char **envp;
+
+	if (client_config.script == NULL)
+		return;
+
+	/* call script */
+	pid = fork();
+	if (pid) {
+		waitpid(pid, NULL, 0);
+		return;
+	} else if (pid == 0) {
+		envp = fill_envp(packet);
+		
+		/* close fd's? */
+		
+		/* exec script */
+		DEBUG(LOG_INFO, "execle'ing %s", client_config.script);
+		execle(client_config.script, client_config.script,
+		       name, NULL, envp);
+		LOG(LOG_ERR, "script %s failed: %s",
+		    client_config.script, strerror(errno));
+		exit(1);
+	}			
+}

networking/udhcp/script.h

@@ -0,0 +1,6 @@
+#ifndef _SCRIPT_H
+#define _SCRIPT_H
+
+void run_script(struct dhcpMessage *packet, const char *name);
+
+#endif

networking/udhcp/serverpacket.c

@@ -0,0 +1,263 @@
+/* serverpacket.c
+ *
+ * Constuct and send DHCP server packets
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <time.h>
+
+#include "packet.h"
+#include "debug.h"
+#include "dhcpd.h"
+#include "options.h"
+#include "leases.h"
+
+/* send a packet to giaddr using the kernel ip stack */
+static int send_packet_to_relay(struct dhcpMessage *payload)
+{
+	DEBUG(LOG_INFO, "Forwarding packet to relay");
+
+	return kernel_packet(payload, server_config.server, SERVER_PORT,
+			payload->giaddr, SERVER_PORT);
+}
+
+
+/* send a packet to a specific arp address and ip address by creating our own ip packet */
+static int send_packet_to_client(struct dhcpMessage *payload, int force_broadcast)
+{
+	unsigned char *chaddr;
+	u_int32_t ciaddr;
+	
+	if (force_broadcast) {
+		DEBUG(LOG_INFO, "broadcasting packet to client (NAK)");
+		ciaddr = INADDR_BROADCAST;
+		chaddr = MAC_BCAST_ADDR;
+	} else if (payload->ciaddr) {
+		DEBUG(LOG_INFO, "unicasting packet to client ciaddr");
+		ciaddr = payload->ciaddr;
+		chaddr = payload->chaddr;
+	} else if (ntohs(payload->flags) & BROADCAST_FLAG) {
+		DEBUG(LOG_INFO, "broadcasting packet to client (requested)");
+		ciaddr = INADDR_BROADCAST;
+		chaddr = MAC_BCAST_ADDR;
+	} else {
+		DEBUG(LOG_INFO, "unicasting packet to client yiaddr");
+		ciaddr = payload->yiaddr;
+		chaddr = payload->chaddr;
+	}
+	return raw_packet(payload, server_config.server, SERVER_PORT, 
+			ciaddr, CLIENT_PORT, chaddr, server_config.ifindex);
+}
+
+
+/* send a dhcp packet, if force broadcast is set, the packet will be broadcast to the client */
+static int send_packet(struct dhcpMessage *payload, int force_broadcast)
+{
+	int ret;
+
+	if (payload->giaddr)
+		ret = send_packet_to_relay(payload);
+	else ret = send_packet_to_client(payload, force_broadcast);
+	return ret;
+}
+
+
+static void init_packet(struct dhcpMessage *packet, struct dhcpMessage *oldpacket, char type)
+{
+	init_header(packet, type);
+	packet->xid = oldpacket->xid;
+	memcpy(packet->chaddr, oldpacket->chaddr, 16);
+	packet->flags = oldpacket->flags;
+	packet->giaddr = oldpacket->giaddr;
+	packet->ciaddr = oldpacket->ciaddr;
+	add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server);
+}
+
+
+/* add in the bootp options */
+static void add_bootp_options(struct dhcpMessage *packet)
+{
+	packet->siaddr = server_config.siaddr;
+	if (server_config.sname)
+		strncpy(packet->sname, server_config.sname, sizeof(packet->sname) - 1);
+	if (server_config.boot_file)
+		strncpy(packet->file, server_config.boot_file, sizeof(packet->file) - 1);
+}
+	
+
+/* send a DHCP OFFER to a DHCP DISCOVER */
+int sendOffer(struct dhcpMessage *oldpacket)
+{
+	struct dhcpMessage packet;
+	struct dhcpOfferedAddr *lease = NULL;
+	u_int32_t req_align, lease_time_align = server_config.lease;
+	unsigned char *req, *lease_time;
+	struct option_set *curr;
+	struct in_addr addr;
+
+	init_packet(&packet, oldpacket, DHCPOFFER);
+	
+	/* ADDME: if static, short circuit */
+	/* the client is in our lease/offered table */
+	if ((lease = find_lease_by_chaddr(oldpacket->chaddr))) {
+		if (!lease_expired(lease)) 
+			lease_time_align = lease->expires - time(0);
+		packet.yiaddr = lease->yiaddr;
+		
+	/* Or the client has a requested ip */
+	} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP)) &&
+
+		   /* Don't look here (ugly hackish thing to do) */
+		   memcpy(&req_align, req, 4) &&
+
+		   /* and the ip is in the lease range */
+		   ntohl(req_align) >= ntohl(server_config.start) &&
+		   ntohl(req_align) <= ntohl(server_config.end) &&
+		   
+		   /* and its not already taken/offered */ /* ADDME: check that its not a static lease */
+		   ((!(lease = find_lease_by_yiaddr(req_align)) ||
+		   
+		   /* or its taken, but expired */ /* ADDME: or maybe in here */
+		   lease_expired(lease)))) {
+				packet.yiaddr = req_align; /* FIXME: oh my, is there a host using this IP? */
+
+	/* otherwise, find a free IP */ /*ADDME: is it a static lease? */
+	} else {
+		packet.yiaddr = find_address(0);
+		
+		/* try for an expired lease */
+		if (!packet.yiaddr) packet.yiaddr = find_address(1);
+	}
+	
+	if(!packet.yiaddr) {
+		LOG(LOG_WARNING, "no IP addresses to give -- OFFER abandoned");
+		return -1;
+	}
+	
+	if (!add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time)) {
+		LOG(LOG_WARNING, "lease pool is full -- OFFER abandoned");
+		return -1;
+	}		
+
+	if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
+		memcpy(&lease_time_align, lease_time, 4);
+		lease_time_align = ntohl(lease_time_align);
+		if (lease_time_align > server_config.lease) 
+			lease_time_align = server_config.lease;
+	}
+
+	/* Make sure we aren't just using the lease time from the previous offer */
+	if (lease_time_align < server_config.min_lease) 
+		lease_time_align = server_config.lease;
+	/* ADDME: end of short circuit */		
+	add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));
+
+	curr = server_config.options;
+	while (curr) {
+		if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
+			add_option_string(packet.options, curr->data);
+		curr = curr->next;
+	}
+
+	add_bootp_options(&packet);
+	
+	addr.s_addr = packet.yiaddr;
+	LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
+	return send_packet(&packet, 0);
+}
+
+
+int sendNAK(struct dhcpMessage *oldpacket)
+{
+	struct dhcpMessage packet;
+
+	init_packet(&packet, oldpacket, DHCPNAK);
+	
+	DEBUG(LOG_INFO, "sending NAK");
+	return send_packet(&packet, 1);
+}
+
+
+int sendACK(struct dhcpMessage *oldpacket, u_int32_t yiaddr)
+{
+	struct dhcpMessage packet;
+	struct option_set *curr;
+	unsigned char *lease_time;
+	u_int32_t lease_time_align = server_config.lease;
+	struct in_addr addr;
+
+	init_packet(&packet, oldpacket, DHCPACK);
+	packet.yiaddr = yiaddr;
+	
+	if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
+		memcpy(&lease_time_align, lease_time, 4);
+		lease_time_align = ntohl(lease_time_align);
+		if (lease_time_align > server_config.lease) 
+			lease_time_align = server_config.lease;
+		else if (lease_time_align < server_config.min_lease) 
+			lease_time_align = server_config.lease;
+	}
+	
+	add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));
+	
+	curr = server_config.options;
+	while (curr) {
+		if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
+			add_option_string(packet.options, curr->data);
+		curr = curr->next;
+	}
+
+	add_bootp_options(&packet);
+
+	addr.s_addr = packet.yiaddr;
+	LOG(LOG_INFO, "sending ACK to %s", inet_ntoa(addr));
+
+	if (send_packet(&packet, 0) < 0) 
+		return -1;
+
+	add_lease(packet.chaddr, packet.yiaddr, lease_time_align);
+
+	return 0;
+}
+
+
+int send_inform(struct dhcpMessage *oldpacket)
+{
+	struct dhcpMessage packet;
+	struct option_set *curr;
+
+	init_packet(&packet, oldpacket, DHCPACK);
+	
+	curr = server_config.options;
+	while (curr) {
+		if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
+			add_option_string(packet.options, curr->data);
+		curr = curr->next;
+	}
+
+	add_bootp_options(&packet);
+
+	return send_packet(&packet, 0);
+}
+
+
+

networking/udhcp/serverpacket.h

@@ -0,0 +1,11 @@
+#ifndef _SERVERPACKET_H
+#define _SERVERPACKET_H
+
+
+int sendOffer(struct dhcpMessage *oldpacket);
+int sendNAK(struct dhcpMessage *oldpacket);
+int sendACK(struct dhcpMessage *oldpacket, u_int32_t yiaddr);
+int send_inform(struct dhcpMessage *oldpacket);
+
+
+#endif

networking/udhcp/socket.c

@@ -0,0 +1,157 @@
+/*
+ * socket.c -- DHCP server client/server socket creation
+ *
+ * udhcp client/server
+ * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
+ *			Chris Trew <ctrew@moreton.com.au>
+ *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <errno.h>
+#include <features.h>
+#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
+#include <netpacket/packet.h>
+#include <net/ethernet.h>
+#else
+#include <asm/types.h>
+#include <linux/if_packet.h>
+#include <linux/if_ether.h>
+#endif
+
+#include "debug.h"
+
+int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp)
+{
+	int fd;
+	struct ifreq ifr;
+	struct sockaddr_in *our_ip;
+
+	memset(&ifr, 0, sizeof(struct ifreq));
+	if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
+		ifr.ifr_addr.sa_family = AF_INET;
+		strcpy(ifr.ifr_name, interface);
+
+		if (addr) { 
+			if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
+				our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
+				*addr = our_ip->sin_addr.s_addr;
+				DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
+			} else {
+				LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %s", 
+						strerror(errno));
+				return -1;
+			}
+		}
+		
+		if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
+			DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
+			*ifindex = ifr.ifr_ifindex;
+		} else {
+			LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno));
+			return -1;
+		}
+		if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
+			memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
+			DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
+				arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
+		} else {
+			LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno));
+			return -1;
+		}
+	} else {
+		LOG(LOG_ERR, "socket failed!: %s", strerror(errno));
+		return -1;
+	}
+	close(fd);
+	return 0;
+}
+
+
+int listen_socket(unsigned int ip, int port, char *inf)
+{
+	struct ifreq interface;
+	int fd;
+	struct sockaddr_in addr;
+	int n = 1;
+
+	DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf);
+	if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
+		return -1;
+	}
+	
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(port);
+	addr.sin_addr.s_addr = ip;
+
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
+		close(fd);
+		return -1;
+	}
+	if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
+		close(fd);
+		return -1;
+	}
+
+	strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
+	if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
+		close(fd);
+		return -1;
+	}
+
+	if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
+		close(fd);
+		return -1;
+	}
+	
+	return fd;
+}
+
+
+int raw_socket(int ifindex)
+{
+	int fd;
+	struct sockaddr_ll sock;
+
+	DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex);
+	if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
+		return -1;
+	}
+	
+	sock.sll_family = AF_PACKET;
+	sock.sll_protocol = htons(ETH_P_IP);
+	sock.sll_ifindex = ifindex;
+	if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
+		DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
+		close(fd);
+		return -1;
+	}
+
+	return fd;
+}
+

networking/udhcp/socket.h

@@ -0,0 +1,9 @@
+/* socket.h */
+#ifndef _SOCKET_H
+#define _SOCKET_H
+
+int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp);
+int listen_socket(unsigned int ip, int port, char *inf);
+int raw_socket(int ifindex);
+
+#endif

networking/udhcpc.c

@@ -1,1587 +0,0 @@
-/* dhcpd.c
- *
- * udhcp DHCP client
- *
- * Russ Dill <Russ.Dill@asu.edu> July 2001
- * 
- * Converted to busybox by Glenn McGrath August 2002
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#include <stdio.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/file.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <stdlib.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <signal.h>
-#include <time.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <errno.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
-#include <netpacket/packet.h>
-#include <net/ethernet.h>
-#else
-#include <asm/types.h>
-#include <linux/if_packet.h>
-#include <linux/if_ether.h>
-#endif
-#include "libbb.h"
-
-static int state;
-static unsigned long requested_ip;	/* = 0 */
-static unsigned long server_addr;
-static unsigned long timeout;
-static int packet_num;	/* = 0 */
-static int fd_main;
-
-/* #define DEBUG */
-
-#define VERSION "0.9.7"
-
-#define LISTEN_NONE 0
-#define LISTEN_KERNEL 1
-#define LISTEN_RAW 2
-static int listen_mode;
-
-#define DEFAULT_SCRIPT	"/usr/share/udhcpc/default.script"
-
-#define DHCP_END		0xFF
-#define TYPE_MASK	0x0F
-#define BROADCAST_FLAG		0x8000
-
-#define SERVER_PORT		67
-
-#define DHCP_MAGIC		0x63825363
-
-#define BOOTREQUEST		1
-#define BOOTREPLY		2
-
-#define ETH_10MB		1
-#define ETH_10MB_LEN		6
-
-#define OPTION_FIELD		0
-#define FILE_FIELD		1
-#define SNAME_FIELD		2
-
-#define INIT_SELECTING	0
-#define REQUESTING	1
-#define BOUND		2
-#define RENEWING	3
-#define REBINDING	4
-#define INIT_REBOOT	5
-#define RENEW_REQUESTED 6
-#define RELEASED	7
-
-#define CLIENT_PORT		68
-
-#define DHCPDISCOVER		1
-#define DHCPOFFER		2
-#define DHCPREQUEST		3
-#define DHCPDECLINE		4
-#define DHCPACK			5
-#define DHCPNAK			6
-#define DHCPRELEASE		7
-#define DHCPINFORM		8
-
-/* DHCP option codes (partial list) */
-#define DHCP_PADDING		0x00
-#define DHCP_SUBNET		0x01
-#define DHCP_TIME_OFFSET	0x02
-#define DHCP_ROUTER		0x03
-#define DHCP_TIME_SERVER	0x04
-#define DHCP_NAME_SERVER	0x05
-#define DHCP_DNS_SERVER		0x06
-#define DHCP_LOG_SERVER		0x07
-#define DHCP_COOKIE_SERVER	0x08
-#define DHCP_LPR_SERVER		0x09
-#define DHCP_HOST_NAME		0x0c
-#define DHCP_BOOT_SIZE		0x0d
-#define DHCP_DOMAIN_NAME	0x0f
-#define DHCP_SWAP_SERVER	0x10
-#define DHCP_ROOT_PATH		0x11
-#define DHCP_IP_TTL		0x17
-#define DHCP_MTU		0x1a
-#define DHCP_BROADCAST		0x1c
-#define DHCP_NTP_SERVER		0x2a
-#define DHCP_WINS_SERVER	0x2c
-#define DHCP_REQUESTED_IP	0x32
-#define DHCP_LEASE_TIME		0x33
-#define DHCP_OPTION_OVER	0x34
-#define DHCP_MESSAGE_TYPE	0x35
-#define DHCP_SERVER_ID		0x36
-#define DHCP_PARAM_REQ		0x37
-#define DHCP_MESSAGE		0x38
-#define DHCP_MAX_SIZE		0x39
-#define DHCP_T1			0x3a
-#define DHCP_T2			0x3b
-#define DHCP_VENDOR		0x3c
-#define DHCP_CLIENT_ID		0x3d
-
-/* miscellaneous defines */
-#define MAC_BCAST_ADDR		(unsigned char *) "\xff\xff\xff\xff\xff\xff"
-#define OPT_CODE 0
-#define OPT_LEN 1
-#define OPT_DATA 2
-
-enum {
-	OPTION_IP = 1,
-	OPTION_IP_PAIR,
-	OPTION_STRING,
-	OPTION_BOOLEAN,
-	OPTION_U8,
-	OPTION_U16,
-	OPTION_S16,
-	OPTION_U32,
-	OPTION_S32
-};
-
-#define OPTION_REQ	0x10	/* have the client request this option */
-#define OPTION_LIST	0x20	/* There can be a list of 1 or more of these */
-
-#ifdef SYSLOG
-# define LOG(level, str, args...) do { printf(str, ## args); \
-				printf("\n"); \
-				syslog(level, str, ## args); } while(0)
-# define OPEN_LOG(name) openlog(name, 0, 0)
-# define CLOSE_LOG() closelog()
-#else
-# define LOG_EMERG	"EMERGENCY!"
-# define LOG_ALERT	"ALERT!"
-# define LOG_CRIT	"critical!"
-# define LOG_WARNING	"warning"
-# define LOG_ERR	"error"
-# define LOG_INFO	"info"
-# define LOG_DEBUG	"debug"
-# define LOG(level, str, args...) do { printf("%s, " str "\n", level, ## args); } while(0)
-# define OPEN_LOG(name)
-# define CLOSE_LOG()
-#endif
-
-#ifdef DEBUG
-# undef DEBUG
-# define DEBUG(level, str, args...) LOG(level, str, ## args)
-# define DEBUGGING
-#else
-# define DEBUG(level, str, args...)
-#endif
-
-struct dhcpMessage {
-	u_int8_t op;
-	u_int8_t htype;
-	u_int8_t hlen;
-	u_int8_t hops;
-	u_int32_t xid;
-	u_int16_t secs;
-	u_int16_t flags;
-	u_int32_t ciaddr;
-	u_int32_t yiaddr;
-	u_int32_t siaddr;
-	u_int32_t giaddr;
-	u_int8_t chaddr[16];
-	u_int8_t sname[64];
-	u_int8_t file[128];
-	u_int32_t cookie;
-	u_int8_t options[308];	/* 312 - cookie */
-};
-
-struct client_config_t {
-	char foreground;	/* Do not fork */
-	char quit_after_lease;	/* Quit after obtaining lease */
-	char abort_if_no_lease;	/* Abort if no lease */
-	char *interface;	/* The name of the interface to use */
-	char *pidfile;		/* Optionally store the process ID */
-	char *script;		/* User script to run at dhcp events */
-	unsigned char *clientid;	/* Optional client id to use */
-	unsigned char *hostname;	/* Optional hostname to use */
-	int ifindex;		/* Index number of the interface to use */
-	unsigned char arp[6];	/* Our arp address */
-};
-
-struct client_config_t client_config = {
-	/* Default options. */
-	abort_if_no_lease:0,
-	foreground:0,
-	quit_after_lease:0,
-	interface:"eth0",
-	pidfile:NULL,
-	script:DEFAULT_SCRIPT,
-	clientid:NULL,
-	hostname:NULL,
-	ifindex:0,
-	arp:"\0\0\0\0\0\0",	/* appease gcc-3.0 */
-};
-
-struct dhcp_option {
-	char name[10];
-	char flags;
-	unsigned char code;
-};
-
-struct udp_dhcp_packet {
-	struct iphdr ip;
-	struct udphdr udp;
-	struct dhcpMessage data;
-};
-
-static const struct dhcp_option options[] = {
-	/* name[10] flags                   code */
-	{"subnet", OPTION_IP | OPTION_REQ, 0x01},
-	{"timezone", OPTION_S32, 0x02},
-	{"router", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03},
-	{"timesvr", OPTION_IP | OPTION_LIST, 0x04},
-	{"namesvr", OPTION_IP | OPTION_LIST, 0x05},
-	{"dns", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06},
-	{"logsvr", OPTION_IP | OPTION_LIST, 0x07},
-	{"cookiesvr", OPTION_IP | OPTION_LIST, 0x08},
-	{"lprsvr", OPTION_IP | OPTION_LIST, 0x09},
-	{"hostname", OPTION_STRING | OPTION_REQ, 0x0c},
-	{"bootsize", OPTION_U16, 0x0d},
-	{"domain", OPTION_STRING | OPTION_REQ, 0x0f},
-	{"swapsvr", OPTION_IP, 0x10},
-	{"rootpath", OPTION_STRING, 0x11},
-	{"ipttl", OPTION_U8, 0x17},
-	{"mtu", OPTION_U16, 0x1a},
-	{"broadcast", OPTION_IP | OPTION_REQ, 0x1c},
-	{"ntpsrv", OPTION_IP | OPTION_LIST, 0x2a},
-	{"wins", OPTION_IP | OPTION_LIST, 0x2c},
-	{"requestip", OPTION_IP, 0x32},
-	{"lease", OPTION_U32, 0x33},
-	{"dhcptype", OPTION_U8, 0x35},
-	{"serverid", OPTION_IP, 0x36},
-	{"message", OPTION_STRING, 0x38},
-	{"tftp", OPTION_STRING, 0x42},
-	{"bootfile", OPTION_STRING, 0x43},
-	{"", 0x00, 0x00}
-};
-
-/* Lengths of the different option types */
-static const unsigned char option_lengths[] = {
-	[OPTION_IP] = 4,
-	[OPTION_IP_PAIR] = 8,
-	[OPTION_BOOLEAN] = 1,
-	[OPTION_STRING] = 1,
-	[OPTION_U8] = 1,
-	[OPTION_U16] = 2,
-	[OPTION_S16] = 2,
-	[OPTION_U32] = 4,
-	[OPTION_S32] = 4
-};
-
-/* get a rough idea of how long an option will be (rounding up...) */
-static const unsigned char max_option_length[] = {
-	[OPTION_IP] = sizeof("255.255.255.255 "),
-	[OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2,
-	[OPTION_STRING] = 1,
-	[OPTION_BOOLEAN] = sizeof("yes "),
-	[OPTION_U8] = sizeof("255 "),
-	[OPTION_U16] = sizeof("65535 "),
-	[OPTION_S16] = sizeof("-32768 "),
-	[OPTION_U32] = sizeof("4294967295 "),
-	[OPTION_S32] = sizeof("-2147483684 "),
-};
-
-/* return the position of the 'end' option (no bounds checking) */
-static int end_option(unsigned char *optionptr)
-{
-	int i = 0;
-
-	while (optionptr[i] != DHCP_END) {
-		if (optionptr[i] == DHCP_PADDING)
-			i++;
-		else
-			i += optionptr[i + OPT_LEN] + 2;
-	}
-	return i;
-}
-
-/* add an option string to the options (an option string contains an option code,
- * length, then data) */
-static int add_option_string(unsigned char *optionptr, unsigned char *string)
-{
-	int end = end_option(optionptr);
-
-	/* end position + string length + option code/length + end option */
-	if (end + string[OPT_LEN] + 2 + 1 >= 308) {
-		LOG(LOG_ERR, "Option 0x%02x did not fit into the packet!",
-			string[OPT_CODE]);
-		return 0;
-	}
-	DEBUG(LOG_INFO, "adding option 0x%02x", string[OPT_CODE]);
-	memcpy(optionptr + end, string, string[OPT_LEN] + 2);
-	optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
-	return string[OPT_LEN] + 2;
-}
-
-/* add a one to four byte option to a packet */
-static int add_simple_option(unsigned char *optionptr, unsigned char code,
-							 u_int32_t data)
-{
-	char length = 0;
-	int i;
-	unsigned char option[2 + 4];
-	unsigned char *u8;
-	u_int16_t *u16;
-	u_int32_t *u32;
-	u_int32_t aligned;
-
-	u8 = (unsigned char *) &aligned;
-	u16 = (u_int16_t *) & aligned;
-	u32 = &aligned;
-
-	for (i = 0; options[i].code; i++)
-		if (options[i].code == code) {
-			length = option_lengths[options[i].flags & TYPE_MASK];
-		}
-
-	if (!length) {
-		DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
-		return 0;
-	}
-
-	option[OPT_CODE] = code;
-	option[OPT_LEN] = length;
-
-	switch (length) {
-	case 1:
-		*u8 = data;
-		break;
-	case 2:
-		*u16 = data;
-		break;
-	case 4:
-		*u32 = data;
-		break;
-	}
-
-	memcpy(option + 2, &aligned, length);
-	return add_option_string(optionptr, option);
-}
-
-static u_int16_t checksum(void *addr, int count)
-{
-	/* Compute Internet Checksum for "count" bytes
-	 *         beginning at location "addr".
-	 */
-	register int32_t sum = 0;
-	u_int16_t *source = (u_int16_t *) addr;
-
-	while (count > 1) {
-		/*  This is the inner loop */
-		sum += *source++;
-		count -= 2;
-	}
-
-	/*  Add left-over byte, if any */
-	if (count > 0) {
-		sum += *(unsigned char *) source;
-	}
-
-	/*  Fold 32-bit sum to 16 bits */
-	while (sum >> 16) {
-		sum = (sum & 0xffff) + (sum >> 16);
-	}
-
-	return ~sum;
-}
-
-/* Constuct a ip/udp header for a packet, and specify the source and dest hardware address */
-static int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip,
-					  int source_port, u_int32_t dest_ip, int dest_port,
-					  unsigned char *dest_arp, int ifindex)
-{
-	int l_fd;
-	int result;
-	struct sockaddr_ll dest;
-	struct udp_dhcp_packet packet;
-
-	if ((l_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
-		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
-		return -1;
-	}
-
-	memset(&dest, 0, sizeof(dest));
-	memset(&packet, 0, sizeof(packet));
-
-	dest.sll_family = AF_PACKET;
-	dest.sll_protocol = htons(ETH_P_IP);
-	dest.sll_ifindex = ifindex;
-	dest.sll_halen = 6;
-	memcpy(dest.sll_addr, dest_arp, 6);
-	if (bind(l_fd, (struct sockaddr *) &dest, sizeof(struct sockaddr_ll)) < 0) {
-		DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
-		close(l_fd);
-		return -1;
-	}
-
-	packet.ip.protocol = IPPROTO_UDP;
-	packet.ip.saddr = source_ip;
-	packet.ip.daddr = dest_ip;
-	packet.udp.source = htons(source_port);
-	packet.udp.dest = htons(dest_port);
-	packet.udp.len = htons(sizeof(packet.udp) + sizeof(struct dhcpMessage));	/* cheat on the psuedo-header */
-	packet.ip.tot_len = packet.udp.len;
-	memcpy(&(packet.data), payload, sizeof(struct dhcpMessage));
-	packet.udp.check = checksum(&packet, sizeof(struct udp_dhcp_packet));
-
-	packet.ip.tot_len = htons(sizeof(struct udp_dhcp_packet));
-	packet.ip.ihl = sizeof(packet.ip) >> 2;
-	packet.ip.version = IPVERSION;
-	packet.ip.ttl = IPDEFTTL;
-	packet.ip.check = checksum(&(packet.ip), sizeof(packet.ip));
-
-	result =
-		sendto(l_fd, &packet, sizeof(struct udp_dhcp_packet), 0,
-			   (struct sockaddr *) &dest, sizeof(dest));
-	if (result <= 0) {
-		DEBUG(LOG_ERR, "write on socket failed: %s", strerror(errno));
-	}
-	close(l_fd);
-	return result;
-}
-
-/* Let the kernel do all the work for packet generation */
-static int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip,
-						 int source_port, u_int32_t dest_ip, int dest_port)
-{
-	int n = 1;
-	int l_fd, result;
-	struct sockaddr_in client;
-
-	if ((l_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
-		return -1;
-	}
-
-	if (setsockopt(l_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) ==
-		-1) {
-		return -1;
-	}
-
-	memset(&client, 0, sizeof(client));
-	client.sin_family = AF_INET;
-	client.sin_port = htons(source_port);
-	client.sin_addr.s_addr = source_ip;
-
-	if (bind(l_fd, (struct sockaddr *) &client, sizeof(struct sockaddr)) ==
-		-1) {
-		return -1;
-	}
-
-	memset(&client, 0, sizeof(client));
-	client.sin_family = AF_INET;
-	client.sin_port = htons(dest_port);
-	client.sin_addr.s_addr = dest_ip;
-
-	if (connect(l_fd, (struct sockaddr *) &client, sizeof(struct sockaddr)) ==
-		-1) {
-		return -1;
-	}
-
-	result = write(l_fd, payload, sizeof(struct dhcpMessage));
-	close(l_fd);
-	return result;
-}
-
-/* initialize a packet with the proper defaults */
-static void init_packet(struct dhcpMessage *packet, char type)
-{
-	struct vendor {
-		char vendor, length;
-		char str[sizeof("udhcp " VERSION)];
-	}
-	vendor_id = {
-	DHCP_VENDOR, sizeof("udhcp " VERSION) - 1, "udhcp " VERSION};
-
-	memset(packet, 0, sizeof(struct dhcpMessage));
-	switch (type) {
-	case DHCPDISCOVER:
-	case DHCPREQUEST:
-	case DHCPRELEASE:
-	case DHCPINFORM:
-		packet->op = BOOTREQUEST;
-		break;
-	case DHCPOFFER:
-	case DHCPACK:
-	case DHCPNAK:
-		packet->op = BOOTREPLY;
-	}
-	packet->htype = ETH_10MB;
-	packet->hlen = ETH_10MB_LEN;
-	packet->cookie = htonl(DHCP_MAGIC);
-	packet->options[0] = DHCP_END;
-	add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
-
-	memcpy(packet->chaddr, client_config.arp, 6);
-	add_option_string(packet->options, client_config.clientid);
-	if (client_config.hostname) {
-		add_option_string(packet->options, client_config.hostname);
-	}
-	add_option_string(packet->options, (unsigned char *) &vendor_id);
-}
-
-
-/* Add a paramater request list for stubborn DHCP servers. Pull the data
- * from the struct in options.c. Don't do bounds checking here because it
- * goes towards the head of the packet. */
-static void add_requests(struct dhcpMessage *packet)
-{
-	int end = end_option(packet->options);
-	int i, len = 0;
-
-	packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
-	for (i = 0; options[i].code; i++) {
-		if (options[i].flags & OPTION_REQ) {
-			packet->options[end + OPT_DATA + len++] = options[i].code;
-		}
-	}
-	packet->options[end + OPT_LEN] = len;
-	packet->options[end + OPT_DATA + len] = DHCP_END;
-
-}
-
-/* Broadcast a DHCP discover packet to the network, with an optionally requested IP */
-static inline int send_discover(unsigned long xid, unsigned long requested)
-{
-	struct dhcpMessage packet;
-
-	init_packet(&packet, DHCPDISCOVER);
-	packet.xid = xid;
-	if (requested) {
-		add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	}
-	add_requests(&packet);
-	DEBUG(LOG_DEBUG, "Sending discover...");
-	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-					  SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-/* Broadcasts a DHCP request message */
-static inline int send_selecting(unsigned long xid, unsigned long server,
-								 unsigned long requested)
-{
-	struct dhcpMessage packet;
-	struct in_addr addr;
-
-	init_packet(&packet, DHCPREQUEST);
-	packet.xid = xid;
-
-	add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
-	add_simple_option(packet.options, DHCP_SERVER_ID, server);
-
-	add_requests(&packet);
-	addr.s_addr = requested;
-	DEBUG(LOG_DEBUG, "Sending select for %s...", inet_ntoa(addr));
-	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-					  SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-
-/* Unicasts or broadcasts a DHCP renew message */
-static int send_renew(unsigned long xid, unsigned long server,
-					  unsigned long ciaddr)
-{
-	struct dhcpMessage packet;
-
-	init_packet(&packet, DHCPREQUEST);
-	packet.xid = xid;
-	packet.ciaddr = ciaddr;
-
-	add_requests(&packet);
-	DEBUG(LOG_DEBUG, "Sending renew...");
-	if (server) {
-		return kernel_packet(&packet, ciaddr, CLIENT_PORT, server,
-							 SERVER_PORT);
-	}
-	return raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
-					  SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
-}
-
-/* Create a random xid */
-static unsigned long random_xid(void)
-{
-	static int initialized;
-
-	if (!initialized) {
-		srand(time(0));
-		initialized++;
-	}
-	return rand();
-}
-
-/* just a little helper */
-static void change_mode(int new_mode)
-{
-	DEBUG(LOG_INFO, "entering %s listen mode",
-		  new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
-	close(fd_main);
-	fd_main = -1;
-	listen_mode = new_mode;
-}
-
-
-/* SIGUSR1 handler (renew) */
-static void renew_requested(int sig)
-{
-	sig = 0;
-	LOG(LOG_INFO, "Received SIGUSR1");
-	if (state == BOUND || state == RENEWING || state == REBINDING ||
-		state == RELEASED) {
-		change_mode(LISTEN_KERNEL);
-		packet_num = 0;
-		state = RENEW_REQUESTED;
-	}
-
-	if (state == RELEASED) {
-		change_mode(LISTEN_RAW);
-		state = INIT_SELECTING;
-	}
-
-	/* Kill any timeouts because the user wants this to hurry along */
-	timeout = 0;
-}
-
-/* get an option with bounds checking (warning, not aligned). */
-static unsigned char *get_option(struct dhcpMessage *packet, int code)
-{
-	int i, length;
-	unsigned char *optionptr;
-	int over = 0, done = 0, curr = OPTION_FIELD;
-
-	optionptr = packet->options;
-	i = 0;
-	length = 308;
-	while (!done) {
-		if (i >= length) {
-			LOG(LOG_WARNING, "bogus packet, option fields too long.");
-			return NULL;
-		}
-		if (optionptr[i + OPT_CODE] == code) {
-			if (i + 1 + optionptr[i + OPT_LEN] >= length) {
-				LOG(LOG_WARNING, "bogus packet, option fields too long.");
-				return NULL;
-			}
-			return optionptr + i + 2;
-		}
-		switch (optionptr[i + OPT_CODE]) {
-		case DHCP_PADDING:
-			i++;
-			break;
-		case DHCP_OPTION_OVER:
-			if (i + 1 + optionptr[i + OPT_LEN] >= length) {
-				LOG(LOG_WARNING, "bogus packet, option fields too long.");
-				return NULL;
-			}
-			over = optionptr[i + 3];
-			i += optionptr[OPT_LEN] + 2;
-			break;
-		case DHCP_END:
-			if (curr == OPTION_FIELD && over & FILE_FIELD) {
-				optionptr = packet->file;
-				i = 0;
-				length = 128;
-				curr = FILE_FIELD;
-			} else if (curr == FILE_FIELD && over & SNAME_FIELD) {
-				optionptr = packet->sname;
-				i = 0;
-				length = 64;
-				curr = SNAME_FIELD;
-			} else {
-				done = 1;
-			}
-			break;
-		default:
-			i += optionptr[OPT_LEN + i] + 2;
-		}
-	}
-	return NULL;
-}
-
-static int sprintip(char *dest, char *pre, unsigned char *ip)
-{
-	return sprintf(dest, "%s%d.%d.%d.%d ", pre, ip[0], ip[1], ip[2], ip[3]);
-}
-
-
-/* Fill dest with the text of option 'option'. */
-static inline void fill_options(char *dest, unsigned char *option,
-								const struct dhcp_option *type_p)
-{
-	int type, optlen;
-	u_int16_t val_u16;
-	int16_t val_s16;
-	u_int32_t val_u32;
-	int32_t val_s32;
-	int len = option[OPT_LEN - 2];
-
-	dest += sprintf(dest, "%s=", type_p->name);
-
-	type = type_p->flags & TYPE_MASK;
-	optlen = option_lengths[type];
-	for (;;) {
-		switch (type) {
-		case OPTION_IP_PAIR:
-			dest += sprintip(dest, "", option);
-			*(dest++) = '/';
-			option += 4;
-			optlen = 4;
-		case OPTION_IP:	/* Works regardless of host byte order. */
-			dest += sprintip(dest, "", option);
-			break;
-		case OPTION_BOOLEAN:
-			dest += sprintf(dest, *option ? "yes " : "no ");
-			break;
-		case OPTION_U8:
-			dest += sprintf(dest, "%u ", *option);
-			break;
-		case OPTION_U16:
-			memcpy(&val_u16, option, 2);
-			dest += sprintf(dest, "%u ", ntohs(val_u16));
-			break;
-		case OPTION_S16:
-			memcpy(&val_s16, option, 2);
-			dest += sprintf(dest, "%d ", ntohs(val_s16));
-			break;
-		case OPTION_U32:
-			memcpy(&val_u32, option, 4);
-			dest += sprintf(dest, "%lu ", (unsigned long) ntohl(val_u32));
-			break;
-		case OPTION_S32:
-			memcpy(&val_s32, option, 4);
-			dest += sprintf(dest, "%ld ", (long) ntohl(val_s32));
-			break;
-		case OPTION_STRING:
-			memcpy(dest, option, len);
-			dest[len] = '\0';
-			return;		/* Short circuit this case */
-		}
-		option += optlen;
-		len -= optlen;
-		if (len <= 0) {
-			break;
-		}
-	}
-}
-
-static char *find_env(const char *prefix, char *defaultstr)
-{
-	extern char **environ;
-	char **ptr;
-	const int len = strlen(prefix);
-
-	for (ptr = environ; *ptr != NULL; ptr++) {
-		if (strncmp(prefix, *ptr, len) == 0) {
-			return *ptr;
-		}
-	}
-	return defaultstr;
-}
-
-/* put all the paramaters into an environment */
-static char **fill_envp(struct dhcpMessage *packet)
-{
-	/* supported options are easily added here */
-	int num_options = 0;
-	int i, j;
-	char **envp;
-	unsigned char *temp;
-	char over = 0;
-
-	if (packet == NULL) {
-		num_options = 0;
-	} else {
-		for (i = 0; options[i].code; i++) {
-			if (get_option(packet, options[i].code)) {
-				num_options++;
-			}
-		}
-		if (packet->siaddr) {
-			num_options++;
-		}
-		if ((temp = get_option(packet, DHCP_OPTION_OVER))) {
-			over = *temp;
-		}
-		if (!(over & FILE_FIELD) && packet->file[0]) {
-			num_options++;
-		}
-		if (!(over & SNAME_FIELD) && packet->sname[0]) {
-			num_options++;
-		}
-	}
-
-	envp = xmalloc((num_options + 5) * sizeof(char *));
-	envp[0] = xmalloc(sizeof("interface=") + strlen(client_config.interface));
-	sprintf(envp[0], "interface=%s", client_config.interface);
-	envp[1] = find_env("PATH", "PATH=/bin:/usr/bin:/sbin:/usr/sbin");
-	envp[2] = find_env("HOME", "HOME=/");
-
-	if (packet == NULL) {
-		envp[3] = NULL;
-		return envp;
-	}
-
-	envp[3] = xmalloc(sizeof("ip=255.255.255.255"));
-	sprintip(envp[3], "ip=", (unsigned char *) &packet->yiaddr);
-	for (i = 0, j = 4; options[i].code; i++) {
-		if ((temp = get_option(packet, options[i].code))) {
-			envp[j] =
-				xmalloc(max_option_length[(&options[i])->flags & TYPE_MASK] *
-						(temp[OPT_LEN - 2] /
-						 option_lengths[(&options[i])->flags & TYPE_MASK]) +
-						strlen((&options[i])->name) + 2);
-			fill_options(envp[j], temp, &options[i]);
-			j++;
-		}
-	}
-	if (packet->siaddr) {
-		envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
-		sprintip(envp[j++], "siaddr=", (unsigned char *) &packet->yiaddr);
-	}
-	if (!(over & FILE_FIELD) && packet->file[0]) {
-		/* watch out for invalid packets */
-		packet->file[sizeof(packet->file) - 1] = '\0';
-		envp[j] = xmalloc(sizeof("boot_file=") + strlen(packet->file));
-		sprintf(envp[j++], "boot_file=%s", packet->file);
-	}
-	if (!(over & SNAME_FIELD) && packet->sname[0]) {
-		/* watch out for invalid packets */
-		packet->sname[sizeof(packet->sname) - 1] = '\0';
-		envp[j] = xmalloc(sizeof("sname=") + strlen(packet->sname));
-		sprintf(envp[j++], "sname=%s", packet->sname);
-	}
-	envp[j] = NULL;
-	return envp;
-}
-
-/* Call a script with a par file and env vars */
-static void run_script(struct dhcpMessage *packet, const char *name)
-{
-	int pid;
-	char **envp;
-
-	if (client_config.script == NULL) {
-		return;
-	}
-
-	/* call script */
-	pid = fork();
-	if (pid) {
-		waitpid(pid, NULL, 0);
-		return;
-	} else if (pid == 0) {
-		envp = fill_envp(packet);
-
-		/* close fd's? */
-
-		/* exec script */
-		DEBUG(LOG_INFO, "execle'ing %s", client_config.script);
-		execle(client_config.script, client_config.script, name, NULL, envp);
-		LOG(LOG_ERR, "script %s failed: %s",
-			client_config.script, strerror(errno));
-		exit(1);
-	}
-}
-
-/* SIGUSR2 handler (release) */
-static void release_requested(int sig)
-{
-	sig = 0;
-	LOG(LOG_INFO, "Received SIGUSR2");
-	/* send release packet */
-	if (state == BOUND || state == RENEWING || state == REBINDING) {
-		struct dhcpMessage packet;
-
-		init_packet(&packet, DHCPRELEASE);
-		packet.xid = random_xid();
-		packet.ciaddr = requested_ip;
-
-		add_simple_option(packet.options, DHCP_REQUESTED_IP, requested_ip);
-		add_simple_option(packet.options, DHCP_SERVER_ID, server_addr);
-
-		DEBUG(LOG_DEBUG, "Sending release...");
-		kernel_packet(&packet, requested_ip, CLIENT_PORT, server_addr,
-					  SERVER_PORT);
-		run_script(NULL, "deconfig");
-	}
-
-	change_mode(LISTEN_NONE);
-	state = RELEASED;
-	timeout = 0x7fffffff;
-}
-
-
-static int pidfile_acquire(char *pidfile)
-{
-	int pid_fd;
-
-	if (pidfile == NULL) {
-		return -1;
-	}
-	pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
-	if (pid_fd < 0) {
-		LOG(LOG_ERR, "Unable to open pidfile %s: %s\n",
-			pidfile, strerror(errno));
-	} else {
-		lockf(pid_fd, F_LOCK, 0);
-	}
-
-	return pid_fd;
-}
-
-
-static void pidfile_write_release(int pid_fd)
-{
-	FILE *out;
-
-	if (pid_fd < 0) {
-		return;
-	}
-	if ((out = fdopen(pid_fd, "w")) != NULL) {
-		fprintf(out, "%d\n", getpid());
-		fclose(out);
-	}
-	lockf(pid_fd, F_UNLCK, 0);
-	close(pid_fd);
-}
-
-/* Exit and cleanup */
-static void exit_client(int retval)
-{
-	unlink(client_config.pidfile);
-	if (client_config.pidfile) {
-		unlink(client_config.pidfile);
-	}
-	CLOSE_LOG();
-	exit(retval);
-}
-
-
-/* SIGTERM handler */
-static void terminate(int sig)
-{
-	sig = 0;
-	LOG(LOG_INFO, "Received SIGTERM");
-	exit_client(0);
-}
-
-
-static inline int read_interface(char *interface, int *ifindex,
-								 u_int32_t * addr, unsigned char *arp)
-{
-	int l_fd;
-	struct ifreq ifr;
-	struct sockaddr_in *s_in;
-
-	memset(&ifr, 0, sizeof(struct ifreq));
-	if ((l_fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
-		ifr.ifr_addr.sa_family = AF_INET;
-		strcpy(ifr.ifr_name, interface);
-
-		if (addr) {
-			if (ioctl(l_fd, SIOCGIFADDR, &ifr) == 0) {
-				s_in = (struct sockaddr_in *) &ifr.ifr_addr;
-				*addr = s_in->sin_addr.s_addr;
-				DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name,
-					  inet_ntoa(s_in->sin_addr));
-			} else {
-				LOG(LOG_ERR, "SIOCGIFADDR failed!: %s", strerror(errno));
-				return -1;
-			}
-		}
-
-		if (ioctl(l_fd, SIOCGIFINDEX, &ifr) == 0) {
-			DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
-			*ifindex = ifr.ifr_ifindex;
-		} else {
-			LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno));
-			return -1;
-		}
-		if (ioctl(l_fd, SIOCGIFHWADDR, &ifr) == 0) {
-			memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
-			DEBUG(LOG_INFO,
-				  "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
-				  arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
-		} else {
-			LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno));
-			return -1;
-		}
-	} else {
-		LOG(LOG_ERR, "socket failed!: %s", strerror(errno));
-		return -1;
-	}
-	close(l_fd);
-	return 0;
-}
-
-
-static inline int listen_socket(unsigned int ip, int port, char *inf)
-{
-	struct ifreq interface;
-	int l_fd;
-	struct sockaddr_in addr;
-	int n = 1;
-
-	DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf);
-	if ((l_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
-		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
-		return -1;
-	}
-
-	memset(&addr, 0, sizeof(addr));
-	addr.sin_family = AF_INET;
-	addr.sin_port = htons(port);
-	addr.sin_addr.s_addr = ip;
-
-	if (setsockopt(l_fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) ==
-		-1) {
-		close(l_fd);
-		return -1;
-	}
-	if (setsockopt(l_fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) ==
-		-1) {
-		close(l_fd);
-		return -1;
-	}
-
-	strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
-	if (setsockopt
-		(l_fd, SOL_SOCKET, SO_BINDTODEVICE, (char *) &interface,
-		 sizeof(interface)) < 0) {
-		close(l_fd);
-		return -1;
-	}
-
-	if (bind(l_fd, (struct sockaddr *) &addr, sizeof(struct sockaddr)) == -1) {
-		close(l_fd);
-		return -1;
-	}
-
-	return l_fd;
-}
-
-
-static int raw_socket(int ifindex)
-{
-	int l_fd;
-	struct sockaddr_ll sock;
-
-	DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex);
-	if ((l_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
-		DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
-		return -1;
-	}
-
-	sock.sll_family = AF_PACKET;
-	sock.sll_protocol = htons(ETH_P_IP);
-	sock.sll_ifindex = ifindex;
-	if (bind(l_fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
-		DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
-		close(l_fd);
-		return -1;
-	}
-
-	return l_fd;
-
-}
-
-/* read a packet from socket fd, return -1 on read error, -2 on packet error */
-static int get_packet(struct dhcpMessage *packet, int l_fd)
-{
-	int bytes;
-	int i;
-	const char broken_vendors[][8] = {
-		"MSFT 98",
-		""
-	};
-	char unsigned *vendor;
-
-	memset(packet, 0, sizeof(struct dhcpMessage));
-	bytes = read(l_fd, packet, sizeof(struct dhcpMessage));
-	if (bytes < 0) {
-		DEBUG(LOG_INFO, "couldn't read on listening socket, ignoring");
-		return -1;
-	}
-
-	if (ntohl(packet->cookie) != DHCP_MAGIC) {
-		LOG(LOG_ERR, "received bogus message, ignoring");
-		return -2;
-	}
-	DEBUG(LOG_INFO, "Received a packet");
-
-	if (packet->op == BOOTREQUEST
-		&& (vendor = get_option(packet, DHCP_VENDOR))) {
-		for (i = 0; broken_vendors[i][0]; i++) {
-			if (vendor[OPT_LEN - 2] ==
-				(unsigned char) strlen(broken_vendors[i])
-				&& !strncmp(vendor, broken_vendors[i], vendor[OPT_LEN - 2])) {
-				DEBUG(LOG_INFO, "broken client (%s), forcing broadcast",
-					  broken_vendors[i]);
-				packet->flags |= htons(BROADCAST_FLAG);
-			}
-		}
-	}
-
-	return bytes;
-}
-
-static inline int get_raw_packet(struct dhcpMessage *payload, int l_fd)
-{
-	int bytes;
-	struct udp_dhcp_packet packet;
-	u_int32_t source, dest;
-	u_int16_t check;
-
-	memset(&packet, 0, sizeof(struct udp_dhcp_packet));
-	bytes = read(l_fd, &packet, sizeof(struct udp_dhcp_packet));
-	if (bytes < 0) {
-		DEBUG(LOG_INFO, "couldn't read on raw listening socket -- ignoring");
-		usleep(500000);	/* possible down interface, looping condition */
-		return -1;
-	}
-
-	if (bytes < (int) (sizeof(struct iphdr) + sizeof(struct udphdr))) {
-		DEBUG(LOG_INFO, "message too short, ignoring");
-		return -1;
-	}
-
-	if (bytes < ntohs(packet.ip.tot_len)) {
-		DEBUG(LOG_INFO, "Truncated packet");
-		return -1;
-	}
-
-	/* ignore any extra garbage bytes */
-	bytes = ntohs(packet.ip.tot_len);
-
-	/* Make sure its the right packet for us, and that it passes sanity checks */
-	if (packet.ip.protocol != IPPROTO_UDP || packet.ip.version != IPVERSION ||
-		packet.ip.ihl != sizeof(packet.ip) >> 2
-		|| packet.udp.dest != htons(CLIENT_PORT)
-		|| bytes > (int) sizeof(struct udp_dhcp_packet)
-		|| ntohs(packet.udp.len) != (short) (bytes - sizeof(packet.ip))) {
-		DEBUG(LOG_INFO, "unrelated/bogus packet");
-		return -1;
-	}
-
-	/* check IP checksum */
-	check = packet.ip.check;
-	packet.ip.check = 0;
-	if (check != checksum(&(packet.ip), sizeof(packet.ip))) {
-		DEBUG(LOG_INFO, "bad IP header checksum, ignoring");
-		return -1;
-	}
-
-	/* verify the UDP checksum by replacing the header with a psuedo header */
-	source = packet.ip.saddr;
-	dest = packet.ip.daddr;
-	check = packet.udp.check;
-	packet.udp.check = 0;
-	memset(&packet.ip, 0, sizeof(packet.ip));
-
-	packet.ip.protocol = IPPROTO_UDP;
-	packet.ip.saddr = source;
-	packet.ip.daddr = dest;
-	packet.ip.tot_len = packet.udp.len;	/* cheat on the psuedo-header */
-	if (check && check != checksum(&packet, bytes)) {
-		DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
-		return -1;
-	}
-
-	memcpy(payload, &(packet.data),
-		   bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
-
-	if (ntohl(payload->cookie) != DHCP_MAGIC) {
-		LOG(LOG_ERR, "received bogus message (bad magic) -- ignoring");
-		return -1;
-	}
-	DEBUG(LOG_INFO, "oooooh!!! got some!");
-	return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
-}
-
-
-int udhcpc_main(int argc, char *argv[])
-{
-	unsigned char *temp, *message;
-	unsigned long t1 = 0, t2 = 0, xid = 0;
-	unsigned long start = 0, lease;
-	fd_set rfds;
-	int retval;
-	struct timeval tv;
-	int c, len;
-	struct dhcpMessage packet;
-	struct in_addr temp_addr;
-	int pid_fd;
-	time_t now;
-
-	static struct option l_options[] = {
-		{"clientid", required_argument, 0, 'c'},
-		{"foreground", no_argument, 0, 'f'},
-		{"hostname", required_argument, 0, 'H'},
-		{"help", no_argument, 0, 'h'},
-		{"interface", required_argument, 0, 'i'},
-		{"now", no_argument, 0, 'n'},
-		{"pidfile", required_argument, 0, 'p'},
-		{"quit", no_argument, 0, 'q'},
-		{"request", required_argument, 0, 'r'},
-		{"script", required_argument, 0, 's'},
-		{"version", no_argument, 0, 'v'},
-		{0, 0, 0, 0}
-	};
-
-	/* get options */
-	while (1) {
-		int option_index = 0;
-
-		c = getopt_long(argc, argv, "c:fH:i:np:qr:s:v", l_options,
-						&option_index);
-		if (c == -1) {
-			break;
-		}
-
-		switch (c) {
-		case 'c':
-			len = strlen(optarg);
-			if (len > 255) {
-				len = 255;
-			}
-			if (client_config.clientid) {
-				free(client_config.clientid);
-			}
-			client_config.clientid = xmalloc(len + 2);
-			client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
-			client_config.clientid[OPT_LEN] = len;
-			client_config.clientid[OPT_DATA] = '\0';
-			strncpy(client_config.clientid + 3, optarg, len - 1);
-			break;
-		case 'f':
-			client_config.foreground = 1;
-			break;
-		case 'H':
-			len = strlen(optarg);
-			if (len > 255) {
-				len = 255;
-			}
-			if (client_config.hostname) {
-				free(client_config.hostname);
-			}
-			client_config.hostname = xmalloc(len + 2);
-			client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
-			client_config.hostname[OPT_LEN] = len;
-			strncpy(client_config.hostname + 2, optarg, len);
-			break;
-		case 'i':
-			client_config.interface = optarg;
-			break;
-		case 'n':
-			client_config.abort_if_no_lease = 1;
-			break;
-		case 'p':
-			client_config.pidfile = optarg;
-			break;
-		case 'q':
-			client_config.quit_after_lease = 1;
-			break;
-		case 'r':
-			requested_ip = inet_addr(optarg);
-			break;
-		case 's':
-			client_config.script = optarg;
-			break;
-		case 'v':
-			printf("udhcpcd, version %s\n\n", VERSION);
-			exit_client(0);
-			break;
-		default:
-			show_usage();
-		}
-	}
-
-	OPEN_LOG("udhcpc");
-	LOG(LOG_INFO, "udhcp client (v%s) started", VERSION);
-
-	pid_fd = pidfile_acquire(client_config.pidfile);
-	pidfile_write_release(pid_fd);
-
-	if (read_interface
-		(client_config.interface, &client_config.ifindex, NULL,
-		 client_config.arp) < 0) {
-		exit_client(1);
-	}
-
-	if (!client_config.clientid) {
-		client_config.clientid = xmalloc(6 + 3);
-		client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
-		client_config.clientid[OPT_LEN] = 7;
-		client_config.clientid[OPT_DATA] = 1;
-		memcpy(client_config.clientid + 3, client_config.arp, 6);
-	}
-
-	/* setup signal handlers */
-	signal(SIGUSR1, renew_requested);
-	signal(SIGUSR2, release_requested);
-	signal(SIGTERM, terminate);
-
-	state = INIT_SELECTING;
-	run_script(NULL, "deconfig");
-	change_mode(LISTEN_RAW);
-
-	for (;;) {
-		tv.tv_sec = timeout - time(0);
-		tv.tv_usec = 0;
-		FD_ZERO(&rfds);
-
-		if (listen_mode != LISTEN_NONE && fd_main < 0) {
-			if (listen_mode == LISTEN_KERNEL) {
-				fd_main =
-					listen_socket(INADDR_ANY, CLIENT_PORT,
-								  client_config.interface);
-			} else {
-				fd_main = raw_socket(client_config.ifindex);
-			}
-			if (fd_main < 0) {
-				LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s",
-					strerror(errno));
-				exit_client(0);
-			}
-		}
-		if (fd_main >= 0) {
-			FD_SET(fd_main, &rfds);
-		}
-
-		if (tv.tv_sec > 0) {
-			DEBUG(LOG_INFO, "Waiting on select...\n");
-			retval = select(fd_main + 1, &rfds, NULL, NULL, &tv);
-		} else {
-			retval = 0;	/* If we already timed out, fall through */
-		}
-
-		now = time(0);
-		if (retval == 0) {
-			/* timeout dropped to zero */
-			switch (state) {
-			case INIT_SELECTING:
-				if (packet_num < 3) {
-					if (packet_num == 0) {
-						xid = random_xid();
-					}
-					/* send discover packet */
-					send_discover(xid, requested_ip);	/* broadcast */
-
-					timeout = now + ((packet_num == 2) ? 10 : 2);
-					packet_num++;
-				} else {
-					if (client_config.abort_if_no_lease) {
-						LOG(LOG_INFO, "No lease, failing.");
-						exit_client(1);
-					}
-					/* wait to try again */
-					packet_num = 0;
-					timeout = now + 60;
-				}
-				break;
-			case RENEW_REQUESTED:
-			case REQUESTING:
-				if (packet_num < 3) {
-					/* send request packet */
-					if (state == RENEW_REQUESTED) {
-						send_renew(xid, server_addr, requested_ip);	/* unicast */
-					} else {
-						send_selecting(xid, server_addr, requested_ip);	/* broadcast */
-					}
-					timeout = now + ((packet_num == 2) ? 10 : 2);
-					packet_num++;
-				} else {
-					/* timed out, go back to init state */
-					state = INIT_SELECTING;
-					timeout = now;
-					packet_num = 0;
-					change_mode(LISTEN_RAW);
-				}
-				break;
-			case BOUND:
-				/* Lease is starting to run out, time to enter renewing state */
-				state = RENEWING;
-				change_mode(LISTEN_KERNEL);
-				DEBUG(LOG_INFO, "Entering renew state");
-				/* fall right through */
-			case RENEWING:
-				/* Either set a new T1, or enter REBINDING state */
-				if ((t2 - t1) <= (lease / 14400 + 1)) {
-					/* timed out, enter rebinding state */
-					state = REBINDING;
-					timeout = now + (t2 - t1);
-					DEBUG(LOG_INFO, "Entering rebinding state");
-				} else {
-					/* send a request packet */
-					send_renew(xid, server_addr, requested_ip);	/* unicast */
-
-					t1 = (t2 - t1) / 2 + t1;
-					timeout = t1 + start;
-				}
-				break;
-			case REBINDING:
-				/* Either set a new T2, or enter INIT state */
-				if ((lease - t2) <= (lease / 14400 + 1)) {
-					/* timed out, enter init state */
-					state = INIT_SELECTING;
-					LOG(LOG_INFO, "Lease lost, entering init state");
-					run_script(NULL, "deconfig");
-					timeout = now;
-					packet_num = 0;
-					change_mode(LISTEN_RAW);
-				} else {
-					/* send a request packet */
-					send_renew(xid, 0, requested_ip);	/* broadcast */
-
-					t2 = (lease - t2) / 2 + t2;
-					timeout = t2 + start;
-				}
-				break;
-			case RELEASED:
-				/* yah, I know, *you* say it would never happen */
-				timeout = 0x7fffffff;
-				break;
-			}
-		} else if (retval > 0 && listen_mode != LISTEN_NONE
-				   && FD_ISSET(fd_main, &rfds)) {
-			/* a packet is ready, read it */
-
-			if (listen_mode == LISTEN_KERNEL) {
-				len = get_packet(&packet, fd_main);
-			} else {
-				len = get_raw_packet(&packet, fd_main);
-			}
-			if (len == -1 && errno != EINTR) {
-				DEBUG(LOG_INFO, "error on read, %s, reopening socket",
-					  strerror(errno));
-				change_mode(listen_mode);	/* just close and reopen */
-			}
-			if (len < 0) {
-				continue;
-			}
-
-			if (packet.xid != xid) {
-				DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
-					  (unsigned long) packet.xid, xid);
-				continue;
-			}
-
-			if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
-				DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
-				continue;
-			}
-
-			switch (state) {
-			case INIT_SELECTING:
-				/* Must be a DHCPOFFER to one of our xid's */
-				if (*message == DHCPOFFER) {
-					if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
-						memcpy(&server_addr, temp, 4);
-						xid = packet.xid;
-						requested_ip = packet.yiaddr;
-
-						/* enter requesting state */
-						state = REQUESTING;
-						timeout = now;
-						packet_num = 0;
-					} else {
-						DEBUG(LOG_ERR, "No server ID in message");
-					}
-				}
-				break;
-			case RENEW_REQUESTED:
-			case REQUESTING:
-			case RENEWING:
-			case REBINDING:
-				if (*message == DHCPACK) {
-					if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
-						LOG(LOG_ERR,
-							"No lease time with ACK, using 1 hour lease");
-						lease = 60 * 60;
-					} else {
-						memcpy(&lease, temp, 4);
-						lease = ntohl(lease);
-					}
-
-					/* enter bound state */
-					t1 = lease / 2;
-
-					/* little fixed point for n * .875 */
-					t2 = (lease * 0x7) >> 3;
-					temp_addr.s_addr = packet.yiaddr;
-					LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
-						inet_ntoa(temp_addr), lease);
-					start = now;
-					timeout = t1 + start;
-					requested_ip = packet.yiaddr;
-					run_script(&packet,
-							   ((state == RENEWING
-								 || state == REBINDING) ? "renew" : "bound"));
-
-					state = BOUND;
-					change_mode(LISTEN_NONE);
-					{
-						int pid_fd2;
-
-						if (client_config.quit_after_lease) {
-							exit_client(0);
-						} else if (!client_config.foreground) {
-							pid_fd2 = pidfile_acquire(client_config.pidfile);	/* hold lock during fork. */
-							if (daemon(0, 0) == -1) {
-								perror("fork");
-								exit_client(1);
-							}
-							client_config.foreground = 1;	/* Do not fork again. */
-							pidfile_write_release(pid_fd2);
-						}
-					}
-				} else if (*message == DHCPNAK) {
-					/* return to init state */
-					LOG(LOG_INFO, "Received DHCP NAK");
-					run_script(&packet, "nak");
-					if (state != REQUESTING) {
-						run_script(NULL, "deconfig");
-					}
-					state = INIT_SELECTING;
-					timeout = now;
-					requested_ip = 0;
-					packet_num = 0;
-					change_mode(LISTEN_RAW);
-					sleep(3);	/* avoid excessive network traffic */
-				}
-				break;
-				/* case BOUND, RELEASED: - ignore all packets */
-			}
-		} else if (retval == -1 && errno == EINTR) {
-			/* a signal was caught */
-
-		} else {
-			/* An error occured */
-			DEBUG(LOG_ERR, "Error on select");
-		}
-
-	}
-	return 0;
-}