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13
networking/udhcp/AUTHORS
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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/)
Vladimir Oleynik <dzo@simtrea.ru> Size optimizations

339
networking/udhcp/COPYING
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GNU GENERAL PUBLIC LICENSE
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Public License instead of this License.

260
networking/udhcp/ChangeLog
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0.9.9 (pending)
+ Various other size optimizations (Vladimir)
+ Change strerror(errno) to %m (Vladimir N. Oleynik <dzo@simtreas.ru>)
+ Fixed a little endian problem in mton (Bastian Blank <waldi@debian.org>)
+ Fixed a arpping alignment problem (Rui He <rhe@3eti.com>)
+ Added sanity check for max_leases (udhcp bug #1285) (me)
+ Finally got rid of the trailing space in enviromental vars (me)
+ added an new enviromental variable: $mask. It contains the number
of subnet bits for tools like ip route that require it.
(Bastian Blank <waldi@debian.org>, me)
0.9.8 (021031)
+ split up README files (me)
+ use /dev/urandom to seed xid's (instead of time(0)) (me)
+ fixed renew behavior (me)
+ udhcp now fits nicely into busybox
(Glenn McGrath <bug1@iinet.net.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
(Erik Andersen <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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networking/udhcp/Makefile
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ifneq ($(wildcard ../../networking/Config.in),)
include Makefile.busybox
else
include Makefile.udhcp
endif

110
networking/udhcp/Makefile.udhcp
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# udhcp makefile
DESTDIR =
prefix = /usr
SBINDIR = /sbin
USRSBINDIR = $(DESTDIR)$(prefix)/sbin
USRBINDIR = $(DESTDIR)$(prefix)/bin
USRSHAREDIR = $(DESTDIR)$(prefix)/share
# Uncomment this to get a shared binary. Call as udhcpd for the server,
# and udhcpc for the client
#COMBINED_BINARY=1
# Uncomment this for extra output and to compile with debugging symbols
#UDHCP_DEBUG=1
# Uncomment this to output messages to syslog, otherwise, messages go to stdout
#UDHCP_SYSLOG=1
# Set to the prefix of your cross-compiler
#CROSS_COMPILE=arm-uclibc-
#---------------------------------------------------#
# You should not have to change anything below here #
#---------------------------------------------------#
CC = $(CROSS_COMPILE)gcc
LD = $(CROSS_COMPILE)gcc
INSTALL = install
OBJS_SHARED = common.o options.o packet.o pidfile.o signalpipe.o socket.o
DHCPD_OBJS = dhcpd.o arpping.o files.o leases.o serverpacket.o static_leases.o
DHCPC_OBJS = dhcpc.o clientpacket.o clientsocket.o script.o
ifdef COMBINED_BINARY
EXEC1 = udhcpd
OBJS1 = $(DHCPD_OBJS) $(DHCPC_OBJS) $(OBJS_SHARED) frontend.o
CFLAGS += -DCOMBINED_BINARY
else
EXEC1 = udhcpd
OBJS1 = $(DHCPD_OBJS) $(OBJS_SHARED)
EXEC2 = udhcpc
OBJS2 = $(DHCPC_OBJS) $(OBJS_SHARED)
endif
EXEC3 = dumpleases
OBJS3 = dumpleases.o
BOOT_PROGRAM = udhcpc
DAEMON = udhcpd
COMMAND = dumpleases
ifdef UDHCP_SYSLOG
CFLAGS += -DUDHCP_SYSLOG
endif
CFLAGS += -W -Wall -Wstrict-prototypes -D_GNU_SOURCE
ifdef UDHCP_DEBUG
CFLAGS += -g -DUDHCP_DEBUG
STRIP=true
else
CFLAGS += -Os -fomit-frame-pointer
STRIP=$(CROSS_COMPILE)strip
endif
all: $(EXEC1) $(EXEC2) $(EXEC3)
$(STRIP) --remove-section=.note --remove-section=.comment $(EXEC1) $(EXEC2) $(EXEC3)
$(OBJS1) $(OBJS2) $(OBJS3): *.h Makefile
$(EXEC1) $(EXEC2) $(EXEC3): Makefile
.c.o:
$(CC) -c $(CFLAGS) $<
$(EXEC1): $(OBJS1)
$(LD) $(CFLAGS) $(LDFLAGS) $(OBJS1) -o $(EXEC1)
$(EXEC2): $(OBJS2)
$(LD) $(CFLAGS) $(LDFLAGS) $(OBJS2) -o $(EXEC2)
$(EXEC3): $(OBJS3)
$(LD) $(CFLAGS) $(LDFLAGS) $(OBJS3) -o $(EXEC3)
install: all
mkdir -p $(USRSBINDIR) $(USRBINDIR)
$(INSTALL) -m 755 $(DAEMON) $(USRSBINDIR)
$(INSTALL) -m 755 $(COMMAND) $(USRBINDIR)
ifdef COMBINED_BINARY
ln -sf $(DAEMON) $(USRSBINDIR)/$(BOOT_PROGRAM)
else
$(INSTALL) -m 755 $(BOOT_PROGRAM) $(USRSBINDIR)
endif
mkdir -p $(USRSHAREDIR)/udhcpc
for name in bound deconfig nak renew script ; do \
$(INSTALL) -m 755 samples/sample.$$name \
$(USRSHAREDIR)/udhcpc/default.$$name ; \
done
mkdir -p $(USRSHAREDIR)/man/man1
$(INSTALL) -m 644 dumpleases.1 $(USRSHAREDIR)/man/man1
mkdir -p $(USRSHAREDIR)/man/man5
$(INSTALL) -m 644 udhcpd.conf.5 $(USRSHAREDIR)/man/man5
mkdir -p $(USRSHAREDIR)/man/man8
$(INSTALL) -m 644 udhcpc.8 udhcpd.8 $(USRSHAREDIR)/man/man8
clean:
-rm -f udhcpd udhcpc dumpleases *.o *.a core

53
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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.
compile time options
-------------------
The Makefile contains three of the compile time options:
UDHCP_DEBUG: If UDHCP_DEBUG is defined, udhcpd will output extra
debugging output, compile with -g, and not fork to the background when
run.
UDHCP_SYSLOG: If UDHCP_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 three compile time options:
LEASE_TIME: The default lease time if not specified in the config
file.
LEASES_FILE: The default file for storing leases.
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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udhcp lease dump (dumpleases)
----------------------------
dumpleases displays the leases written out by the udhcpd server. 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. dumpleases accepts the
following command line options:
-a, --absolute Interpret lease times as expiration time.
-r, --remaining Interpret lease times as remaining time.
-f, --file=FILE Read lease information from FILE.
-h, --help Display help.
Note that if udhcpd has not written a leases file recently, the output
of may not be up to date.

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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.
command line options
-------------------
The command line options for the udhcp client are:
-c, --clientid=CLIENTID Set client identifier. Type is first char.
-C, --clientid-none Suppress default client identifier
-V, --vendorclass=CLASSID Set vendor class identifier
-H, --hostname=HOSTNAME Client hostname
-h, Alias for -H
-F, --fqdn=FQDN Client fully qualified domain name
-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)
-t, --retries=NUM Send up to NUM request packets
-v, --version Display version
If the requested IP address cannot be obtained, the client accepts the
address that the server offers.
udhcp client scripts
-------------------
When an event occurs, udhcpc calls the action script. udhcpc never does
any configuration of the network interface itself, but instead relies on
a set of scripts. 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 must 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
mask - The number of bits in the netmask (ie: 24)
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.
note on udhcpc's random seed
---------------------------
udhcpc will seed its random number generator (used for generating xid's)
by reading /dev/urandom. If you have a lot of embedded systems on the same
network, with no entropy, you can either seed /dev/urandom by a method of
your own, or doing the following on startup:
ifconfig eth0 > /dev/urandom
in order to seed /dev/urandom with some data (mac address) unique to your
system. If reading /dev/urandom fails, udhcpc will fall back to its old
behavior of seeding with time(0).
signals accepted by udhcpc
-------------------------
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
-------------------
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

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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 remaining 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
compile time options
-------------------
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.

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TODO
----
+ Check for valid IP, netmask, hostname, paths, strings, etc
+ Integrade README.*'s with manpages
+ using time(0) breaks if the system clock changes, find a portable solution
+ make failure of reading functions revert to previous value, not the default
+ sanity code for option[OPT_LEN]
+ fix aliasing (ie: eth0:0)
+ better standard linux distro support
+ make sure packet generation works on a wide varitey of arches
+ Interoperability testing
+ Hooks within the DHCP server
* Server notification when a lease is added/removed
+ Additional bootp support in client/server
+ Make serverid option in server configurable
+ Possibly add failure message to DHCP NAK

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.TH DUMPLEASES 1 2001-09-27 GNU/Linux "GNU/Linux Administrator's Manual"
.SH NAME
dumpleases \- display leases granted by udhcp server
.SH SYNOPSIS
.B dumpleases
.RI [ OPTION ]...
.SH DESCRIPTION
Display the DHCP leases granted by
.BR udhcpd (8).
.SH OPTIONS
.TP
.BR \-a ,\ \-\-absolute
Interpret lease times as expiration time.
.TP
.BI \-f\ FILE,\ \-\-file= FILE
Read lease information from
.IR FILE .
.TP
.BR \-h ,\ \-\-help
Display help.
.TP
.BR \-r ,\ \-\-remaining
Interpret lease times as remaining time.
.SH FILES
.TP
.I /var/lib/misc/udhcpd.leases
Lease information file.
.SH SEE ALSO
.BR udhcpd (8),
.BR udhcpd.conf (5).

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The files in this dir are:
udhcpd.conf: A sample udhpcd configuration file.
sample.script
sample.nak
sample.deconfig
sample.bound
sample.renew : sample scripts for the udhcpc client.
simple.script : a simple sample script for the client.

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#!/bin/sh
# Sample udhcpc renew script
RESOLV_CONF="/etc/udhcpc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
if [ -n "$router" ]
then
echo "deleting routers"
while /sbin/route del default gw 0.0.0.0 dev $interface
do :
done
for i in $router
do
/sbin/route add default gw $i dev $interface
done
fi
echo -n > $RESOLV_CONF
[ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
for i in $dns
do
echo adding dns $i
echo nameserver $i >> $RESOLV_CONF
done

4
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#!/bin/sh
# Sample udhcpc deconfig script
/sbin/ifconfig $interface 0.0.0.0

4
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#!/bin/sh
# Sample udhcpc nak script
echo Received a NAK: $message

30
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#!/bin/sh
# Sample udhcpc bound script
RESOLV_CONF="/etc/udhcpc/resolv.conf"
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"
/sbin/ifconfig $interface $ip $BROADCAST $NETMASK
if [ -n "$router" ]
then
echo "deleting routers"
while /sbin/route del default gw 0.0.0.0 dev $interface
do :
done
for i in $router
do
/sbin/route add default gw $i dev $interface
done
fi
echo -n > $RESOLV_CONF
[ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
for i in $dns
do
echo adding dns $i
echo nameserver $i >> $RESOLV_CONF
done

7
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#!/bin/sh
# Currently, we only dispatch according to command. However, a more
# elaborate system might dispatch by command and interface or do some
# common initialization first, especially if more dhcp event notifications
# are added.
exec /usr/share/udhcpc/sample.$1

39
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#!/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

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# 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
#opt subnet
#opt timezone
#opt router
#opt timesvr
#opt namesvr
#opt dns
#opt logsvr
#opt cookiesvr
#opt lprsvr
#opt bootsize
#opt domain
#opt swapsvr
#opt rootpath
#opt ipttl
#opt mtu
#opt broadcast
#opt wins
#opt lease
#opt ntpsrv
#opt tftp
#opt bootfile

208
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.TH UDHCPC 8 2001-09-26 GNU/Linux "GNU/Linux Administrator's Manual"
.SH NAME
udhcpc \- very small DHCP client
.SH SYNOPSIS
.B udhcpc
.RI [ OPTION ]...
.SH DESCRIPTION
The udhcp client negotiates a lease with the DHCP server and
executes a script when it is obtained or lost.
.SH OPTIONS
.TP
.BI \-c\ CLIENTID ,\ \-\-clientid= CLIENTID
Send the client identifier
.IR CLIENTID .
.TP
.BR -f ,\ \-\-foreground
Do not fork after obtaining a lease.
.TP
.BI \-H\ HOSTNAME ,\ \-\-hostname= HOSTNAME
Send the client hostname
.IR HOSTNAME .
.TP
.BI \-h\ HOSTNAME
Alias for -H
.IR HOSTNAME .
.TP
.BI \-i\ INTERFACE ,\ \-\-interface= INTERFACE
Configure
.IR INTERFACE .
.TP
.BR -n ,\ \-\-now
Exit with failure if a lease cannot be obtained.
.TP
.BI \-p\ FILE ,\ \-\-pidfile= FILE
Write the process ID of the daemon to
.IR FILE .
.TP
.BR -q ,\ \-\-quit
Exit after obtaining a lease.
.TP
.BI \-r\ ADDRESS ,\ \-\-request= ADDRESS
Request IP address
.IR ADDRESS .
.TP
.BI \-s\ FILE ,\ \-\-script= FILE
Use script
.IR FILE .
.TP
.BR -v ,\ \-\-version
Display version.
.SH USAGE
When an event occurs,
.B udhcpc
executes a script. There are four possible arguments to this
script:
.TP
.B deconfig
.B deconfig
is used when
.B udhcpc
starts, and when a lease is lost. The script should put the
interface in an up, but deconfigured, state.
.TP
.B bound
.B bound
is used when
.B udhcpc
moves from an unbound to a bound state. The script should
configure the interface and set any other relevant parameters
(e.g., default gateway, dns server, etc.).
.TP
.B renew
.B renew
is used when
.B udhcpc
when a lease is renewed. The interface is already
configured, so the IP address will not change. Other parameters
(e.g., default gateway, subnet mask, dns server) may.
.TP
.B nak
.B nak
is used when
.B udhcpc
receieves a NAK packet from the server. The
enviromental variable
.B $message
will contain the reason for the
NAK message if the server included one. Processing this message
is optional, as the script will also be called with deconfig if
need be.
.PP
Parameters are passed to the script via the following environment
variables:
.TP
.B HOME
The inherited HOME, or "/" if it is unset.
.TP
.B PATH
The inherited PATH, or "/bin:/usr/bin:/sbin:/usr/sbin" if it is
unset.
.TP
.B interface
The interface.
.TP
.B ip
The client IP address.
.TP
.B siaddr
The BOOTP next server option.
.TP
.B sname
The BOOTP server name option.
.TP
.B boot_file
The BOOTP boot file option.
.TP
.B subnet
The subnet mask.
.TP
.B timezone
The timezone offset from UTC in seconds.
.TP
.B router
The list of routers.
.TP
.B timesvr
The list of time servers.
.TP
.B namesvr
The list of IEN 116 name servers.
.TP
.B dns
The list of DNS servers.
.TP
.B logsvr
The list of MIT-LCS UDP log servers.
.TP
.B cookiesvr
The list of RFC 865 cookie servers.
.TP
.B lprsvr
The list of LPR servers.
.TP
.B hostname
The host name.
.TP
.B bootsize
The length in 512-octet blocks of the bootfile.
.TP
.B domain
The domain name of the network.
.TP
.B swapsvr
The client's swap server.
.TP
.B rootpath
The path of the client's root dist.
.TP
.B ipttl
The TTL.
.TP
.B mtu
The MTU.
.TP
.B broadcast
The broadcast address.
.TP
.B ntpsrv
The list of NTP servers.
.TP
.B wins
The list of WINS servers.
.TP
.B lease
The lease time in seconds.
.TP
.B dhcptype
The DHCP message type (safely ignored).
.TP
.B serverid
The server IP address.
.TP
.B message
Reason for a DHCPNAK.
.TP
.B tftp
The TFTP server name.
.TP
.B bootfile
The bootfile name.
.SH FILES
.TP
.I /usr/share/udhcpc/default.script
Script run when leases are obtained or lost.
.SH NOTES
.B udhcpc
responds to the following signals:
.TP
.B SIGUSR1
This signal causes
.B udhcpc
to renew the current lease or, if it does not have one, obtain a
new lease.
.TP
.B SIGUSR2
This signal caused
.B udhcpc
to release the current lease.

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.TH UDHCPD 8 2001-09-27 GNU/Linux "GNU/Linux Administrator's Manual"
.SH NAME
udhcpd \- very small DHCP server
.SH SYNOPSIS
.B udhcpd
.SH DESCRIPTION
The udhcp server negotiates leases with DHCP clients.
.SH FILES
.TP
.I /etc/udhcpd.conf
Configuration file.
.TP
.I /var/lib/misc/udhcpd.leases
Lease information file.
.SH SEE ALSO
.BR dumpleases (1),
.BR udhcpd.conf (8).

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.TH UDHCPD.CONF 5 2001-09-26 GNU/Linux "GNU/Linux Administrator's Manual"
.SH NAME
udhcpd.conf \- udhcp server configuration file
.SH DESCRIPTION
The file
.I /etc/udhcpd.conf
contains configuration information specific to the udhcp server.
It should contain one configuration keyword per line, followed by
appropriate configuration information.
.SH OPTIONS
.TP
.BI start\ ADDRESS
The starting address of the IP lease block is
.IR ADDRESS .
The default is
.BR 192.168.0.20 .
.TP
.BI end\ ADDRESS
The ending address of the IP lease block is
.IR ADDRESS .
The default is
.BR 192.168.0.254 .
.TP
.BI interface\ INTERFACE
The udhcp server should listen on
.IR INTERFACE .
The default is
.BR eth0 .
.TP
.BI max_leases\ LEASES
Offer at most
.I LEASES
leases (including those reserved by OFFERs, DECLINEs, and ARP
conflicts). The default is
.BR 254 .
.TP
.BI remaining\ REMAINING
If
.I REMAINING
is
.BR yes ,
store the time remaining for each lease. If it is
.BR no ,
store the expiration time for each lease. The default is
.BR yes .
.TP
.BI auto_time\ SECONDS
Write the lease information to a file every
.I SECONDS
seconds. The default is
.BR 7200 .
.TP
.BI decline_time\ SECONDS
Reserve an IP for
.I SECONDS
seconds if a DHCP decline message is received. The default is
.BR 3600 .
.TP
.BI conflict_time\ SECONDS
Reserve an IP for
.I SECONDS
seconds if an ARP conflict occurs. The default is
.BR 3600 .
.TP
.BI offer_time\ SECONDS
Reserve an IP for
.I SECONDS
seconds if it is offered. The default is
.BR 60 .
.TP
.BI min_lease\ SECONDS
Reserve an IP for the full lease time if the lease to be given is less than
.I SECONDS
seconds. The default is
.BR 60 .
.TP
.BI lease_file\ FILE
Write the lease information to
.IR FILE .
The default is
.BR /var/lib/misc/udhcpd.leases .
.TP
.BI pidfile\ FILE
Write the process ID to
.IR FILE .
The default is
.BR /var/run/udhcpd.pid .
.TP
.BI notify_file\ FILE
Execute
.I FILE
after the lease information is written. By default, no file is executed.
.TP
.BI siaddr\ ADDRESS
BOOTP specific option. The default is
.BR 0.0.0.0 .
.TP
.BI sname\ NAME
BOOTP specific option. There is no default.
.TP
.BI boot_file\ FILE
BOOTP specific option. There is no default.
.TP
.BI option\ OPTION
DHCP specific option.
.RS
.TP
.BI subnet\ ADDRESS
.TP
.BI timezone\ OFFSET
.TP
.BI router\ ADDRESS...
.TP
.BI timesvr\ ADDRESS...
.TP
.BI namesvr\ ADDRESS...
.TP
.BI dns\ ADDRESS...
.TP
.BI logsvr\ ADDRESS...
.TP
.BI cookiesvr\ ADDRESS...
.TP
.BI lprsvr\ ADDRESS...
.TP
.BI hostname\ HOSTNAME
.TP
.BI bootsize\ SIZE
.TP
.BI domain\ DOMAIN
.TP
.BI swapsvr\ ADDRESS
.TP
.BI rootpath\ PATH
.TP
.BI ipttl\ TTL
.TP
.BI mtu\ MTU
.TP
.BI broadcast\ ADDRESS
.TP
.BI ntpsrv\ ADDRESS...
.TP
.BI wins\ ADDRESS...
.TP
.BI requestip\ ADDRESS
.TP
.BI lease\ SECONDS
.TP
.BI dhcptype\ TYPE
.TP
.BI serverid\ ADDRESS
.TP
.BI tftp\ FILE
.TP
.BI bootfile\ FILE
The default for
.B lease
is
.BR 864000 .
There are no defaults for the other options.
.RE
.SH SEE ALSO
.BR udhcpd (8).