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added full udhcp integration

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This commit is contained in:
Russ Dill 2002-10-14 21:41:28 +00:00
parent 9060a73159
commit 61fb48930f
48 changed files with 4421 additions and 1597 deletions
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2
Makefile
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@ -22,7 +22,7 @@ include $(TOPDIR).config
include $(TOPDIR)Rules.mak
SUBDIRS:=applets archival archival/libunarchive console-tools \
editors fileutils findutils init miscutils modutils networking \
procps loginutils shell shellutils sysklogd \
networking/udhcp procps loginutils shell shellutils sysklogd \
textutils util-linux libbb libpwdgrp
all: do-it-all

2
examples/udhcpc/default.bound → examples/udhcp/sample.bound
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@ -1,7 +1,7 @@
#!/bin/sh
# Sample udhcpc renew script
RESOLV_CONF="/etc/resolv.conf"
RESOLV_CONF="/etc/udhcpc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"

0
examples/udhcpc/default.deconfig → examples/udhcp/sample.deconfig
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4
examples/udhcp/sample.nak Executable file
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@ -0,0 +1,4 @@
#!/bin/sh
# Sample udhcpc nak script
echo Received a NAK: $message

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

2
examples/udhcpc/default.script → examples/udhcp/sample.script
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@ -4,4 +4,4 @@
# common initialization first, especially if more dhcp event notifications
# are added.
exec /usr/share/udhcpc/default.$1
exec /usr/share/udhcpc/sample.$1

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

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

8
include/applets.h
View File

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

20
include/usage.h
View File

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

1
networking/Makefile.in
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@ -35,7 +35,6 @@ NETWORKING-$(CONFIG_TELNET) += telnet.o
NETWORKING-$(CONFIG_TELNETD) += telnetd.o
NETWORKING-$(CONFIG_TFTP) += tftp.o
NETWORKING-$(CONFIG_TRACEROUTE) += traceroute.o
NETWORKING-$(CONFIG_UDHCPC) += udhcpc.o
NETWORKING-$(CONFIG_WGET) += wget.o
libraries-y+=$(NETWORKING_DIR)$(NETWORKING_AR)

3
networking/config.in
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@ -47,12 +47,13 @@ if [ "$CONFIG_TRACEROUTE" = "y" ]; then
bool ' Enable verbose output' CONFIG_FEATURE_TRACEROUTE_VERBOSE
bool ' Enable SO_DEBUG option' CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
fi
bool 'udhcpc' CONFIG_UDHCPC
bool 'wget' CONFIG_WGET
if [ "$CONFIG_WGET" = "y" ]; then
bool ' Enable a nifty process meter (+2k)' CONFIG_FEATURE_WGET_STATUSBAR
bool ' Enable HTTP authentication' CONFIG_FEATURE_WGET_AUTHENTICATION
fi
source networking/udhcp/config.in
endmenu

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

339
networking/udhcp/COPYING Normal file
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@ -0,0 +1,339 @@
GNU GENERAL PUBLIC LICENSE
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246
networking/udhcp/ChangeLog Normal file
View File

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

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# 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))

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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.

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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

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/*
* 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;
}

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/*
* 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

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/* 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));
}

12
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#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

18
networking/udhcp/config.in Normal file
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#
# 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

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networking/udhcp/debug.h Normal file
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#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

559
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/* 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;
}

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/* 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

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/* 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;
}

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/* 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

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#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;
}

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/*
* 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);
}

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/* 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

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#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;
}

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/*
* 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;
}

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/* 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

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/* 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 */

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/*
* 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;
}
}

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/* 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

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#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;
}

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#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

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/* 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);
}

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/* 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);

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/* 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);
}
}

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#ifndef _SCRIPT_H
#define _SCRIPT_H
void run_script(struct dhcpMessage *packet, const char *name);
#endif

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/* 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);
}

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#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

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/*
* 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;
}

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/* 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

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