include $(TOPDIR)Rules.mak
SUBDIRS:=applets archival archival/libunarchive console-tools \
editors fileutils findutils init miscutils modutils networking \
- procps loginutils shell shellutils sysklogd \
+ networking/udhcp procps loginutils shell shellutils sysklogd \
textutils util-linux libbb libpwdgrp
all: do-it-all
#!/bin/sh
# Sample udhcpc renew script
-RESOLV_CONF="/etc/resolv.conf"
+RESOLV_CONF="/etc/udhcpc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
--- /dev/null
+#!/bin/sh
+# Sample udhcpc nak script
+
+echo Received a NAK: $message
#!/bin/sh
# Sample udhcpc bound script
-RESOLV_CONF="/etc/resolv.conf"
+RESOLV_CONF="/etc/udhcpc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
do
echo adding dns $i
echo nameserver $i >> $RESOLV_CONF
-done
+done
\ No newline at end of file
# common initialization first, especially if more dhcp event notifications
# are added.
-exec /usr/share/udhcpc/default.$1
+exec /usr/share/udhcpc/sample.$1
--- /dev/null
+#!/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
--- /dev/null
+# 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
\ No newline at end of file
#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
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)
#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 \
"/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" \
"\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-$(CONFIG_TELNETD) += telnetd.o
NETWORKING-$(CONFIG_TFTP) += tftp.o
NETWORKING-$(CONFIG_TRACEROUTE) += traceroute.o
-NETWORKING-$(CONFIG_UDHCPC) += udhcpc.o
NETWORKING-$(CONFIG_WGET) += wget.o
libraries-y+=$(NETWORKING_DIR)$(NETWORKING_AR)
bool ' Enable verbose output' CONFIG_FEATURE_TRACEROUTE_VERBOSE
bool ' Enable SO_DEBUG option' CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
fi
-bool 'udhcpc' CONFIG_UDHCPC
bool 'wget' CONFIG_WGET
if [ "$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
--- /dev/null
+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)
+
+
--- /dev/null
+ 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
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+\f
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+ END OF TERMS AND CONDITIONS
+\f
+ Appendix: How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+
+ <one line to give the program's name and a brief idea of what it does.>
+ 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
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+ (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
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+
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+ 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
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+
+ 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
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+
+You should also get your employer (if you work as a programmer) or your
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+
+ 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.
--- /dev/null
+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
+
--- /dev/null
+# 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))
+
--- /dev/null
+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.
--- /dev/null
+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
\ No newline at end of file
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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
--- /dev/null
+/* 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));
+
+}
+
--- /dev/null
+#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
--- /dev/null
+#
+# 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
+
--- /dev/null
+#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
--- /dev/null
+/* 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;
+}
+
--- /dev/null
+/* 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
--- /dev/null
+/* 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;
+}
+
--- /dev/null
+/* 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
--- /dev/null
+#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;
+}
--- /dev/null
+/*
+ * 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);
+}
+
+
--- /dev/null
+/* 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
--- /dev/null
+#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;
+}
--- /dev/null
+/*
+ * 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;
+}
+
--- /dev/null
+/* 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
--- /dev/null
+/* 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 */
--- /dev/null
+/*
+ * 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;
+ }
+}
--- /dev/null
+/* 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
--- /dev/null
+#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;
+}
+
--- /dev/null
+#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
--- /dev/null
+/* 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);
+}
+
+
--- /dev/null
+/* 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);
+
--- /dev/null
+/* 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);
+ }
+}
--- /dev/null
+#ifndef _SCRIPT_H
+#define _SCRIPT_H
+
+void run_script(struct dhcpMessage *packet, const char *name);
+
+#endif
--- /dev/null
+/* 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);
+}
+
+
+
--- /dev/null
+#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
--- /dev/null
+/*
+ * 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;
+}
+
--- /dev/null
+/* 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
+++ /dev/null
-/* 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;
-}
projects / platform / upstream / busybox.git / commitdiff