USE_DPKG_DEB(APPLET_ODDNAME(dpkg-deb, dpkg_deb, _BB_DIR_USR_BIN, _BB_SUID_NEVER, dpkg_deb))
USE_DU(APPLET(du, du, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_DUMPKMAP(APPLET(dumpkmap, dumpkmap, _BB_DIR_BIN, _BB_SUID_NEVER))
+USE_DUMPLEASES(APPLET(dumpleases, dumpleases, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_E2FSCK(APPLET(e2fsck, e2fsck, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_E2LABEL(APPLET_NOUSAGE(e2label, tune2fs, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_ECHO(APPLET(echo, echo, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_TRUE(APPLET(true, true, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_TTY(APPLET(tty, tty, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TUNE2FS(APPLET(tune2fs, tune2fs, _BB_DIR_SBIN, _BB_SUID_NEVER))
+USE_UDHCPC(APPLET(udhcpc, udhcpc, _BB_DIR_SBIN, _BB_SUID_NEVER))
+USE_UDHCPD(APPLET(udhcpd, udhcpd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
USE_UMOUNT(APPLET(umount, umount, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_UNAME(APPLET(uname, uname, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_UNCOMPRESS(APPLET(uncompress, uncompress, _BB_DIR_BIN, _BB_SUID_NEVER))
--- /dev/null
+udhcp server/client package
+-----------------------
+
+Russ Dill <Russ.Dill@asu.edu>
+Matthew Ramsay <matthewr@moreton.com.au>
+Chris Trew <christ@moreton.com.au>
+
+Other Credits:
+--------------
+Moreton Bay (http://www.moretonbay.com/)
+Vladimir Oleynik <dzo@simtrea.ru> Size optimizations
+
+
--- /dev/null
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 675 Mass Ave, Cambridge, MA 02139, USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
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+
+ Finally, any free program is threatened constantly by software
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+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+\f
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+\f
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
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+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
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+
+If distribution of executable or object code is made by offering
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+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+\f
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+distribute so as to satisfy simultaneously your obligations under this
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+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+\f
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+\f
+ Appendix: How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) 19yy <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) 19yy name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Library General
+Public License instead of this License.
--- /dev/null
+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
+
--- /dev/null
+#
+# For a description of the syntax of this configuration file,
+# see scripts/kbuild/config-language.txt.
+#
+
+menu "udhcp Server/Client"
+
+config CONFIG_UDHCPD
+ bool "udhcp Server (udhcpd)"
+ default n
+ help
+ uDHCPd is a DHCP server geared primarily toward embedded systems,
+ while striving to be fully functional and RFC compliant.
+
+ See http://udhcp.busybox.net for further details.
+
+config CONFIG_UDHCPC
+ bool "udhcp Client (udhcpc)"
+ default n
+ help
+ uDHCPc is a DHCP client geared primarily toward embedded systems,
+ while striving to be fully functional and RFC compliant.
+
+ The udhcp client negotiates a lease with the DHCP server and
+ notifies a set of scripts when a lease is obtained or lost.
+
+ See http://udhcp.busybox.net for further details.
+
+config CONFIG_DUMPLEASES
+ bool "Lease display utility (dumpleases)"
+ default n
+ depends on CONFIG_UDHCPD
+ help
+ dumpleases displays the leases written out by the udhcpd server.
+ Lease times are stored in the file by time remaining in lease, or
+ by the absolute time that it expires in seconds from epoch.
+
+ See http://udhcp.busybox.net for further details.
+
+config CONFIG_FEATURE_UDHCP_SYSLOG
+ bool " Log udhcp messages to syslog (instead of stdout)"
+ default n
+ depends on CONFIG_UDHCPD || CONFIG_UDHCPC
+ help
+ If selected, udhcpd will log all its messages to syslog, otherwise,
+ it will attempt to log them to stdout.
+
+ See http://udhcp.busybox.net for further details.
+
+config CONFIG_FEATURE_UDHCP_DEBUG
+ bool " Compile udhcp with noisy debugging messages"
+ default n
+ depends on CONFIG_UDHCPD || CONFIG_UDHCPC
+ help
+ If selected, udhcpd will output extra debugging output. If using
+ this option, compile uDHCP with "-g", and do not fork the daemon to
+ the background.
+
+ See http://udhcp.busybox.net for further details.
+
+endmenu
+
--- /dev/null
+ifneq ($(wildcard ../../networking/Config.in),)
+include Makefile.busybox
+else
+include Makefile.udhcp
+endif
--- /dev/null
+# Makefile for busybox
+#
+# Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.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
+#
+
+ifndef top_srcdir
+top_srcdir=../..
+endif
+ifndef top_builddir
+top_builddir=../..
+endif
+srcdir=$(top_srcdir)/networking/udhcp
+UDHCP_DIR:=./
+include $(top_builddir)/Rules.mak
+include $(top_builddir)/.config
+include Makefile.in
+all: $(libraries-y)
+-include $(top_builddir)/.depend
+
+clean:
+ rm -f *.o *.a $(AR_TARGET)
+
--- /dev/null
+# Makefile for busybox
+#
+# Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+#
+# Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+#
+
+UDHCP_AR:=udhcp.a
+ifndef $(UDHCP_DIR)
+UDHCP_DIR:=$(top_builddir)/networking/udhcp/
+endif
+srcdir=$(top_srcdir)/networking/udhcp
+
+#ok, so I forgot how to do an or, but this is a quick and dirty hack
+ifeq ($(strip $(CONFIG_UDHCPC)),y)
+CONFIG_UDHCP_SHARED=y
+else
+ifeq ($(strip $(CONFIG_UDHCPD)),y)
+CONFIG_UDHCP_SHARED=y
+else
+CONFIG_UDHCP_SHARED=n
+endif
+endif
+
+UDHCP-y:=
+UDHCP-$(CONFIG_UDHCP_SHARED) += common.c options.c packet.c pidfile.c \
+ signalpipe.c socket.c
+UDHCP-$(CONFIG_UDHCPC) += dhcpc.c clientpacket.c clientsocket.c \
+ script.c
+UDHCP-$(CONFIG_UDHCPD) += dhcpd.c arpping.c files.c leases.c \
+ serverpacket.c static_leases.c
+UDHCP-$(CONFIG_DUMPLEASES) += dumpleases.c
+UDHCP_OBJS:=$(patsubst %.c,$(UDHCP_DIR)%.o, $(UDHCP-y))
+
+ifneq ($(strip $(UDHCP-y)),)
+libraries-y+=$(UDHCP_DIR)$(UDHCP_AR)
+endif
+
+UDHCP-y:=$(patsubst %,$(srcdir)/%,$(UDHCP-y))
+UDHCP-a:=$(wildcard $(srcdir)/*.c)
+APPLET_SRC-y+=$(UDHCP-y)
+APPLET_SRC-a+=$(UDHCP-a)
+
+UDHCP_INCLUDES:=$(srcdir)
+
+APPLETS_DEFINE-y+=-DIN_BUSYBOX -I$(UDHCP_INCLUDES)
+APPLETS_DEFINE-a+=-DIN_BUSYBOX -I$(UDHCP_INCLUDES)
+
+$(UDHCP_DIR)$(UDHCP_AR): $(UDHCP_OBJS)
+ $(do_ar)
+
+$(UDHCP_OBJS): $(UDHCP_DIR)%.o : $(srcdir)/%.c
+ $(compile.c) -DIN_BUSYBOX
--- /dev/null
+# 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
--- /dev/null
+udhcp server/client package readme
+-------------------------
+
+The udhcp server/client package is primarily geared towards embedded
+systems. It does however, strive to be fully functional, and RFC
+compliant.
+
+
+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.
+
--- /dev/null
+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.
+
--- /dev/null
+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)
+-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
+
--- /dev/null
+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.
--- /dev/null
+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
--- /dev/null
+/*
+ * arpping.c
+ *
+ * Mostly stolen from: dhcpcd - DHCP client daemon
+ * by Yoichi Hariguchi <yoichi@fore.com>
+ */
+
+#include <sys/time.h>
+#include <time.h>
+#include <sys/socket.h>
+#include <netinet/if_ether.h>
+#include <net/if_arp.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "dhcpd.h"
+#include "arpping.h"
+#include "common.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(uint32_t yiaddr, uint32_t ip, uint8_t *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) {
+#ifdef IN_BUSYBOX
+ LOG(LOG_ERR, bb_msg_can_not_create_raw_socket);
+#else
+ LOG(LOG_ERR, "Could not open raw socket");
+#endif
+ 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.h_dest, MAC_BCAST_ADDR, 6); /* MAC DA */
+ memcpy(arp.h_source, mac, 6); /* MAC SA */
+ arp.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 */
+ memcpy(arp.sInaddr, &ip, sizeof(ip)); /* source IP address */
+ memcpy(arp.sHaddr, mac, 6); /* source hardware address */
+ memcpy(arp.tInaddr, &yiaddr, sizeof(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;
+ prevTime = uptime();
+ 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: %m");
+ 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) &&
+ memcmp(arp.tHaddr, mac, 6) == 0 &&
+ *((uint32_t *) arp.sInaddr) == yiaddr) {
+ DEBUG(LOG_INFO, "Valid arp reply receved for this address");
+ rv = 0;
+ break;
+ }
+ }
+ timeout -= uptime() - prevTime;
+ prevTime = uptime();
+ }
+ close(s);
+ DEBUG(LOG_INFO, "%salid arp replies for this address", rv ? "No v" : "V");
+ return rv;
+}
--- /dev/null
+/*
+ * arpping .h
+ */
+
+#ifndef ARPPING_H
+#define ARPPING_H
+
+#include <netinet/if_ether.h>
+#include <net/if_arp.h>
+#include <net/if.h>
+#include <netinet/in.h>
+
+struct arpMsg {
+ /* Ethernet header */
+ u_char h_dest[6]; /* destination ether addr */
+ u_char h_source[6]; /* source ether addr */
+ u_short h_proto; /* packet type ID field */
+
+ /* ARP packet */
+ uint16_t htype; /* hardware type (must be ARPHRD_ETHER) */
+ uint16_t ptype; /* protocol type (must be ETH_P_IP) */
+ uint8_t hlen; /* hardware address length (must be 6) */
+ uint8_t plen; /* protocol address length (must be 4) */
+ uint16_t operation; /* ARP opcode */
+ uint8_t sHaddr[6]; /* sender's hardware address */
+ uint8_t sInaddr[4]; /* sender's IP address */
+ uint8_t tHaddr[6]; /* target's hardware address */
+ uint8_t tInaddr[4]; /* target's IP address */
+ uint8_t pad[18]; /* pad for min. Ethernet payload (60 bytes) */
+} ATTRIBUTE_PACKED;
+
+/* function prototypes */
+int arpping(uint32_t yiaddr, uint32_t ip, uint8_t *arp, char *interface);
+
+#endif
--- /dev/null
+/* clientpacket.c
+ *
+ * Packet generation and dispatching functions for the DHCP client.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <string.h>
+#include <sys/socket.h>
+#include <features.h>
+#if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
+#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 <fcntl.h>
+
+
+#include "dhcpd.h"
+#include "clientpacket.h"
+#include "options.h"
+#include "dhcpc.h"
+#include "common.h"
+
+
+/* Create a random xid */
+unsigned long random_xid(void)
+{
+ static int initialized;
+ if (!initialized) {
+ int fd;
+ unsigned long seed;
+
+ fd = open("/dev/urandom", 0);
+ if (fd < 0 || read(fd, &seed, sizeof(seed)) < 0) {
+ LOG(LOG_WARNING, "Could not load seed from /dev/urandom: %m");
+ seed = time(0);
+ }
+ if (fd >= 0) close(fd);
+ srand(seed);
+ initialized++;
+ }
+ return rand();
+}
+
+
+/* initialize a packet with the proper defaults */
+static void init_packet(struct dhcpMessage *packet, char type)
+{
+ init_header(packet, type);
+ memcpy(packet->chaddr, client_config.arp, 6);
+ if (client_config.clientid)
+ add_option_string(packet->options, client_config.clientid);
+ if (client_config.hostname) add_option_string(packet->options, client_config.hostname);
+ if (client_config.fqdn) add_option_string(packet->options, client_config.fqdn);
+ add_option_string(packet->options, client_config.vendorclass);
+}
+
+
+/* Add a parameter 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; dhcp_options[i].code; i++)
+ if (dhcp_options[i].flags & OPTION_REQ)
+ packet->options[end + OPT_DATA + len++] = dhcp_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;
+ uint32_t source, dest;
+ uint16_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) != (uint16_t) (bytes - sizeof(packet.ip))) {
+ DEBUG(LOG_INFO, "unrelated/bogus packet");
+ return -2;
+ }
+
+ /* check IP checksum */
+ check = packet.ip.check;
+ packet.ip.check = 0;
+ if (check != checksum(&(packet.ip), sizeof(packet.ip))) {
+ DEBUG(LOG_INFO, "bad IP header checksum, ignoring");
+ return -1;
+ }
+
+ /* verify the UDP checksum by replacing the header with a psuedo header */
+ source = packet.ip.saddr;
+ dest = packet.ip.daddr;
+ check = packet.udp.check;
+ packet.udp.check = 0;
+ memset(&packet.ip, 0, sizeof(packet.ip));
+
+ packet.ip.protocol = IPPROTO_UDP;
+ packet.ip.saddr = source;
+ packet.ip.daddr = dest;
+ packet.ip.tot_len = packet.udp.len; /* cheat on the psuedo-header */
+ if (check && check != checksum(&packet, bytes)) {
+ DEBUG(LOG_ERR, "packet with bad UDP checksum received, ignoring");
+ return -2;
+ }
+
+ memcpy(payload, &(packet.data), bytes - (sizeof(packet.ip) + sizeof(packet.udp)));
+
+ if (ntohl(payload->cookie) != DHCP_MAGIC) {
+ LOG(LOG_ERR, "received bogus message (bad magic) -- ignoring");
+ return -2;
+ }
+ DEBUG(LOG_INFO, "oooooh!!! got some!");
+ return bytes - (sizeof(packet.ip) + sizeof(packet.udp));
+
+}
--- /dev/null
+#ifndef _CLIENTPACKET_H
+#define _CLIENTPACKET_H
+
+#include "packet.h"
+
+unsigned long random_xid(void);
+int send_discover(unsigned long xid, unsigned long requested);
+int send_selecting(unsigned long xid, unsigned long server, unsigned long requested);
+int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr);
+int send_renew(unsigned long xid, unsigned long server, unsigned long ciaddr);
+int send_release(unsigned long server, unsigned long ciaddr);
+int get_raw_packet(struct dhcpMessage *payload, int fd);
+
+#endif
--- /dev/null
+/*
+ * clientsocket.c -- DHCP client socket creation
+ *
+ * udhcp 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 <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <features.h>
+#if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
+#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 "clientsocket.h"
+#include "common.h"
+
+
+int raw_socket(int ifindex)
+{
+ int fd;
+ struct sockaddr_ll sock;
+
+ DEBUG(LOG_INFO, "Opening raw socket on ifindex %d", ifindex);
+ if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
+ DEBUG(LOG_ERR, "socket call failed: %m");
+ 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: %m");
+ close(fd);
+ return -1;
+ }
+
+ return fd;
+}
--- /dev/null
+/* clientsocket.h */
+#ifndef _CLIENTSOCKET_H
+#define _CLIENTSOCKET_H
+
+int raw_socket(int ifindex);
+
+#endif
--- /dev/null
+/* vi: set sw=4 ts=4: */
+/* common.c
+ *
+ * Functions for debugging and logging as well as some other
+ * simple helper functions.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> 2001-2003
+ * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <paths.h>
+#include <sys/socket.h>
+#include <stdarg.h>
+
+#include "common.h"
+#include "pidfile.h"
+
+
+static int daemonized;
+
+long uptime(void)
+{
+ struct sysinfo info;
+ sysinfo(&info);
+ return info.uptime;
+}
+
+
+/*
+ * This function makes sure our first socket calls
+ * aren't going to fd 1 (printf badness...) and are
+ * not later closed by daemon()
+ */
+static inline void sanitize_fds(void)
+{
+ int zero;
+ if ((zero = open(_PATH_DEVNULL, O_RDWR, 0)) < 0) return;
+ while (zero < 3) zero = dup(zero);
+ close(zero);
+}
+
+
+void background(const char *pidfile)
+{
+#ifdef __uClinux__
+ LOG(LOG_ERR, "Cannot background in uclinux (yet)");
+#else /* __uClinux__ */
+ int pid_fd;
+
+ /* hold lock during fork. */
+ pid_fd = pidfile_acquire(pidfile);
+ if (daemon(0, 0) == -1) { /* bb_xdaemon? */
+ perror("fork");
+ exit(1);
+ }
+ daemonized++;
+ pidfile_write_release(pid_fd);
+#endif /* __uClinux__ */
+}
+
+
+#ifdef UDHCP_SYSLOG
+
+void udhcp_logging(int level, const char *fmt, ...)
+{
+ va_list p;
+ va_list p2;
+
+ va_start(p, fmt);
+ __va_copy(p2, p);
+ if(!daemonized) {
+ vprintf(fmt, p);
+ putchar('\n');
+ }
+ vsyslog(level, fmt, p2);
+ va_end(p);
+}
+
+#else
+
+
+static char *syslog_level_msg[] = {
+ [LOG_EMERG] = "EMERGENCY!",
+ [LOG_ALERT] = "ALERT!",
+ [LOG_CRIT] = "critical!",
+ [LOG_WARNING] = "warning",
+ [LOG_ERR] = "error",
+ [LOG_INFO] = "info",
+ [LOG_DEBUG] = "debug"
+};
+
+
+void udhcp_logging(int level, const char *fmt, ...)
+{
+ va_list p;
+
+ va_start(p, fmt);
+ if(!daemonized) {
+ printf("%s, ", syslog_level_msg[level]);
+ vprintf(fmt, p);
+ putchar('\n');
+ }
+ va_end(p);
+}
+#endif
+
+
+void start_log_and_pid(const char *client_server, const char *pidfile)
+{
+ int pid_fd;
+
+ /* Make sure our syslog fd isn't overwritten */
+ sanitize_fds();
+
+ /* do some other misc startup stuff while we are here to save bytes */
+ pid_fd = pidfile_acquire(pidfile);
+ pidfile_write_release(pid_fd);
+
+ /* equivelent of doing a fflush after every \n */
+ setlinebuf(stdout);
+
+#ifdef UDHCP_SYSLOG
+ openlog(client_server, LOG_PID | LOG_CONS, LOG_LOCAL0);
+#endif
+
+ udhcp_logging(LOG_INFO, "%s (v%s) started", client_server, VERSION);
+}
--- /dev/null
+/* common.h
+ *
+ * Russ Dill <Russ.Dill@asu.edu> September 2001
+ * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
+ *
+ * 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.
+ */
+
+#ifndef _COMMON_H
+#define _COMMON_H
+
+#include "version.h"
+#include "libbb_udhcp.h"
+
+
+#ifndef UDHCP_SYSLOG
+enum syslog_levels {
+ LOG_EMERG = 0,
+ LOG_ALERT,
+ LOG_CRIT,
+ LOG_WARNING,
+ LOG_ERR,
+ LOG_INFO,
+ LOG_DEBUG
+};
+#else
+#include <syslog.h>
+#endif
+
+long uptime(void);
+void background(const char *pidfile);
+void start_log_and_pid(const char *client_server, const char *pidfile);
+void udhcp_logging(int level, const char *fmt, ...);
+
+#define LOG(level, str, args...) udhcp_logging(level, str, ## args)
+
+#ifdef UDHCP_DEBUG
+# define DEBUG(level, str, args...) LOG(level, str, ## args)
+#else
+# define DEBUG(level, str, args...) do {;} while(0)
+#endif
+
+#endif
--- /dev/null
+/* dhcpc.c
+ *
+ * udhcp DHCP client
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+#include <sys/time.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 "common.h"
+#include "dhcpd.h"
+#include "dhcpc.h"
+#include "options.h"
+#include "clientpacket.h"
+#include "clientsocket.h"
+#include "script.h"
+#include "socket.h"
+#include "signalpipe.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 = -1;
+
+#define LISTEN_NONE 0
+#define LISTEN_KERNEL 1
+#define LISTEN_RAW 2
+static int listen_mode;
+
+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,
+ .vendorclass = NULL,
+ .hostname = NULL,
+ .fqdn = NULL,
+ .ifindex = 0,
+ .retries = 3,
+ .timeout = 3,
+ .arp = "\0\0\0\0\0\0", /* appease gcc-3.0 */
+};
+
+#ifndef IN_BUSYBOX
+static void ATTRIBUTE_NORETURN show_usage(void)
+{
+ printf(
+"Usage: udhcpc [OPTIONS]\n\n"
+" -c, --clientid=CLIENTID Set client identifier - type is first char\n"
+" -C, --clientid-none Suppress default client identifier\n"
+" -V, --vendorclass=CLASSID Set vendor class identifier\n"
+" -H, --hostname=HOSTNAME Client hostname\n"
+" -h Alias for -H\n"
+" -F, --fqdn=FQDN Client fully qualified domain name\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"
+" -T, --timeout=seconds Try to get the lease for the amount of\n"
+" seconds (default: 3)\n"
+" -t, --retries=NUM Send up to NUM request packets\n"
+" -v, --version Display version\n"
+ );
+ exit(0);
+}
+#else
+#define show_usage bb_show_usage
+extern void show_usage(void) ATTRIBUTE_NORETURN;
+#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");
+ if (fd >= 0) 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 BOUND:
+ change_mode(LISTEN_KERNEL);
+ case RENEWING:
+ case REBINDING:
+ state = RENEW_REQUESTED;
+ break;
+ case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
+ run_script(NULL, "deconfig");
+ case REQUESTING:
+ case RELEASED:
+ change_mode(LISTEN_RAW);
+ state = INIT_SELECTING;
+ break;
+ case INIT_SELECTING:
+ break;
+ }
+
+ /* 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;
+}
+
+
+static void client_background(void)
+{
+ background(client_config.pidfile);
+ client_config.foreground = 1; /* Do not fork again. */
+ client_config.background_if_no_lease = 0;
+}
+
+
+#ifdef COMBINED_BINARY
+int udhcpc_main(int argc, char *argv[])
+#else
+int main(int argc, char *argv[])
+#endif
+{
+ uint8_t *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;
+ long now;
+ int max_fd;
+ int sig;
+ int no_clientid = 0;
+
+ static const struct option arg_options[] = {
+ {"clientid", required_argument, 0, 'c'},
+ {"clientid-none", no_argument, 0, 'C'},
+ {"vendorclass", required_argument, 0, 'V'},
+ {"foreground", no_argument, 0, 'f'},
+ {"background", no_argument, 0, 'b'},
+ {"hostname", required_argument, 0, 'H'},
+ {"hostname", required_argument, 0, 'h'},
+ {"fqdn", required_argument, 0, 'F'},
+ {"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'},
+ {"timeout", required_argument, 0, 'T'},
+ {"version", no_argument, 0, 'v'},
+ {"retries", required_argument, 0, 't'},
+ {0, 0, 0, 0}
+ };
+
+ /* get options */
+ while (1) {
+ int option_index = 0;
+ c = getopt_long(argc, argv, "c:CV:fbH:h:F:i:np:qr:s:T:t:v", arg_options, &option_index);
+ if (c == -1) break;
+
+ switch (c) {
+ case 'c':
+ if (no_clientid) show_usage();
+ len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+ 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((char*)client_config.clientid + OPT_DATA, optarg, len);
+ break;
+ case 'C':
+ if (client_config.clientid) show_usage();
+ no_clientid = 1;
+ break;
+ case 'V':
+ len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+ free(client_config.vendorclass);
+ client_config.vendorclass = xmalloc(len + 2);
+ client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
+ client_config.vendorclass[OPT_LEN] = len;
+ strncpy((char*)client_config.vendorclass + 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);
+ 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((char*)client_config.hostname + 2, optarg, len);
+ break;
+ case 'F':
+ len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+ free(client_config.fqdn);
+ client_config.fqdn = xmalloc(len + 5);
+ client_config.fqdn[OPT_CODE] = DHCP_FQDN;
+ client_config.fqdn[OPT_LEN] = len + 3;
+ /* Flags: 0000NEOS
+ S: 1 => Client requests Server to update A RR in DNS as well as PTR
+ O: 1 => Server indicates to client that DNS has been updated regardless
+ E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
+ N: 1 => Client requests Server to not update DNS
+ */
+ client_config.fqdn[OPT_LEN + 1] = 0x1;
+ client_config.fqdn[OPT_LEN + 2] = 0;
+ client_config.fqdn[OPT_LEN + 3] = 0;
+ strncpy((char*)client_config.fqdn + 5, 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 'T':
+ client_config.timeout = atoi(optarg);
+ break;
+ case 't':
+ client_config.retries = atoi(optarg);
+ break;
+ case 'v':
+ printf("udhcpcd, version %s\n\n", VERSION);
+ return 0;
+ break;
+ default:
+ show_usage();
+ }
+ }
+
+ /* Start the log, sanitize fd's, and write a pid file */
+ start_log_and_pid("udhcpc", client_config.pidfile);
+
+ if (read_interface(client_config.interface, &client_config.ifindex,
+ NULL, client_config.arp) < 0)
+ return 1;
+
+ /* if not set, and not suppressed, setup the default client ID */
+ if (!client_config.clientid && !no_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);
+ }
+
+ if (!client_config.vendorclass) {
+ client_config.vendorclass = xmalloc(sizeof("udhcp "VERSION) + 2);
+ client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
+ client_config.vendorclass[OPT_LEN] = sizeof("udhcp "VERSION) - 1;
+ client_config.vendorclass[OPT_DATA] = 1;
+ memcpy(&client_config.vendorclass[OPT_DATA],
+ "udhcp "VERSION, sizeof("udhcp "VERSION) - 1);
+ }
+
+
+ /* setup the signal pipe */
+ udhcp_sp_setup();
+
+ state = INIT_SELECTING;
+ run_script(NULL, "deconfig");
+ change_mode(LISTEN_RAW);
+
+ for (;;) {
+
+ tv.tv_sec = timeout - uptime();
+ tv.tv_usec = 0;
+
+ 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, %m");
+ return 0;
+ }
+ }
+ max_fd = udhcp_sp_fd_set(&rfds, fd);
+
+ if (tv.tv_sec > 0) {
+ DEBUG(LOG_INFO, "Waiting on select...");
+ retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
+ } else retval = 0; /* If we already timed out, fall through */
+
+ now = uptime();
+ if (retval == 0) {
+ /* timeout dropped to zero */
+ switch (state) {
+ case INIT_SELECTING:
+ if (packet_num < client_config.retries) {
+ if (packet_num == 0)
+ xid = random_xid();
+
+ /* send discover packet */
+ send_discover(xid, requested_ip); /* broadcast */
+
+ timeout = now + client_config.timeout;
+ packet_num++;
+ } else {
+ run_script(NULL, "leasefail");
+ if (client_config.background_if_no_lease) {
+ LOG(LOG_INFO, "No lease, forking to background.");
+ client_background();
+ } else if (client_config.abort_if_no_lease) {
+ LOG(LOG_INFO, "No lease, failing.");
+ return 1;
+ }
+ /* wait to try again */
+ packet_num = 0;
+ timeout = now + 60;
+ }
+ break;
+ case RENEW_REQUESTED:
+ case REQUESTING:
+ if (packet_num < client_config.retries) {
+ /* 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 */
+ if (state == RENEW_REQUESTED) run_script(NULL, "deconfig");
+ 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, %m, reopening socket");
+ 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;
+ }
+
+ /* Ignore packets that aren't for us */
+ if (memcmp(packet.chaddr, client_config.arp, 6)) {
+ DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
+ 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)
+ return 0;
+ if (!client_config.foreground)
+ client_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 && (sig = udhcp_sp_read(&rfds))) {
+ switch (sig) {
+ case SIGUSR1:
+ perform_renew();
+ break;
+ case SIGUSR2:
+ perform_release();
+ break;
+ case SIGTERM:
+ LOG(LOG_INFO, "Received SIGTERM");
+ return 0;
+ }
+ } else if (retval == -1 && errno == EINTR) {
+ /* a signal was caught */
+ } else {
+ /* An error occured */
+ DEBUG(LOG_ERR, "Error on select");
+ }
+
+ }
+ return 0;
+}
--- /dev/null
+/* dhcpc.h */
+#ifndef _DHCPC_H
+#define _DHCPC_H
+
+/* grab define DEFAULT_SCRIPT */
+#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 */
+ uint8_t *clientid; /* Optional client id to use */
+ uint8_t *vendorclass; /* Optional vendor class-id to use */
+ uint8_t *hostname; /* Optional hostname to use */
+ uint8_t *fqdn; /* Optional fully qualified domain name to use */
+ int ifindex; /* Index number of the interface to use */
+ int retries; /* Max number of request packets */
+ int timeout; /* Number of seconds to try to get a lease */
+ uint8_t arp[6]; /* Our arp address */
+};
+
+extern struct client_config_t client_config;
+
+
+#endif
--- /dev/null
+/* dhcpd.c
+ *
+ * udhcp Server
+ * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
+ * Chris Trew <ctrew@moreton.com.au>
+ *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.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 "dhcpd.h"
+#include "arpping.h"
+#include "socket.h"
+#include "options.h"
+#include "files.h"
+#include "serverpacket.h"
+#include "common.h"
+#include "signalpipe.h"
+#include "static_leases.h"
+
+
+/* globals */
+struct dhcpOfferedAddr *leases;
+struct server_config_t server_config;
+
+
+#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;
+ uint8_t *state;
+ uint8_t *server_id, *requested;
+ uint32_t server_id_align, requested_align;
+ unsigned long timeout_end;
+ struct option_set *option;
+ struct dhcpOfferedAddr *lease;
+ struct dhcpOfferedAddr static_lease;
+ int max_sock;
+ unsigned long num_ips;
+
+ uint32_t static_lease_ip;
+
+ memset(&server_config, 0, sizeof(struct server_config_t));
+ read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]);
+
+ /* Start the log, sanitize fd's, and write a pid file */
+ start_log_and_pid("udhcpd", server_config.pidfile);
+
+ 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;
+
+ /* Sanity check */
+ num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1;
+ if (server_config.max_leases > num_ips) {
+ LOG(LOG_ERR, "max_leases value (%lu) not sane, "
+ "setting to %lu instead",
+ server_config.max_leases, num_ips);
+ server_config.max_leases = num_ips;
+ }
+
+ leases = xcalloc(server_config.max_leases, sizeof(struct dhcpOfferedAddr));
+ read_leases(server_config.lease_file);
+
+ if (read_interface(server_config.interface, &server_config.ifindex,
+ &server_config.server, server_config.arp) < 0)
+ return 1;
+
+#ifndef UDHCP_DEBUG
+ background(server_config.pidfile); /* hold lock during fork. */
+#endif
+
+ /* Setup the signal pipe */
+ udhcp_sp_setup();
+
+ 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, %m");
+ return 2;
+ }
+
+ max_sock = udhcp_sp_fd_set(&rfds, server_socket);
+ 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) {
+ 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;
+ }
+
+ switch (udhcp_sp_read(&rfds)) {
+ 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");
+ return 0;
+ case 0: break; /* no signal */
+ default: continue; /* signal or error (probably EINTR) */
+ }
+
+ 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, %m, reopening socket");
+ 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;
+ }
+
+ /* Look for a static lease */
+ static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);
+
+ if(static_lease_ip)
+ {
+ printf("Found static lease: %x\n", static_lease_ip);
+
+ memcpy(&static_lease.chaddr, &packet.chaddr, 16);
+ static_lease.yiaddr = static_lease_ip;
+ static_lease.expires = 0;
+
+ lease = &static_lease;
+
+ }
+ else
+ {
+ 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) {
+ if (server_id) {
+ /* SELECTING State */
+ DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align));
+ if (server_id_align == server_config.server && requested &&
+ requested_align == lease->yiaddr) {
+ sendACK(&packet, lease->yiaddr);
+ }
+ } else {
+ if (requested) {
+ /* INIT-REBOOT State */
+ if (lease->yiaddr == requested_align)
+ sendACK(&packet, lease->yiaddr);
+ else sendNAK(&packet);
+ } else {
+ /* RENEWING or REBINDING State */
+ if (lease->yiaddr == packet.ciaddr)
+ sendACK(&packet, lease->yiaddr);
+ else {
+ /* don't know what to do!!!! */
+ sendNAK(&packet);
+ }
+ }
+ }
+
+ /* what to do if we have no record of the client */
+ } else if (server_id) {
+ /* SELECTING State */
+
+ } else if (requested) {
+ /* INIT-REBOOT State */
+ if ((lease = find_lease_by_yiaddr(requested_align))) {
+ if (lease_expired(lease)) {
+ /* probably best if we drop this lease */
+ memset(lease->chaddr, 0, 16);
+ /* make some contention for this address */
+ } else sendNAK(&packet);
+ } else if (requested_align < server_config.start ||
+ requested_align > server_config.end) {
+ sendNAK(&packet);
+ } /* else remain silent */
+
+ } else {
+ /* RENEWING or REBINDING State */
+ }
+ break;
+ case DHCPDECLINE:
+ DEBUG(LOG_INFO,"received DECLINE");
+ if (lease) {
+ memset(lease->chaddr, 0, 16);
+ lease->expires = time(0) + server_config.decline_time;
+ }
+ break;
+ case DHCPRELEASE:
+ DEBUG(LOG_INFO,"received RELEASE");
+ if (lease) lease->expires = time(0);
+ break;
+ case DHCPINFORM:
+ DEBUG(LOG_INFO,"received INFORM");
+ send_inform(&packet);
+ break;
+ default:
+ LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
+ }
+ }
+
+ return 0;
+}
+
--- /dev/null
+/* dhcpd.h */
+#ifndef _DHCPD_H
+#define _DHCPD_H
+
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+
+#include "libbb_udhcp.h"
+#include "leases.h"
+#include "version.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 */
+#define LEASES_FILE "/var/lib/misc/udhcpd.leases"
+
+/* 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_FQDN 0x51
+
+#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 (uint8_t *) "\xff\xff\xff\xff\xff\xff"
+#define OPT_CODE 0
+#define OPT_LEN 1
+#define OPT_DATA 2
+
+struct option_set {
+ uint8_t *data;
+ struct option_set *next;
+};
+
+struct static_lease {
+ uint8_t *mac;
+ uint32_t *ip;
+ struct static_lease *next;
+};
+
+struct server_config_t {
+ uint32_t server; /* Our IP, in network order */
+ uint32_t start; /* Start address of leases, network order */
+ uint32_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 */
+ uint8_t 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 */
+ uint32_t siaddr; /* next server bootp option */
+ char *sname; /* bootp server name */
+ char *boot_file; /* bootp boot file option */
+ struct static_lease *static_leases; /* List of ip/mac pairs to assign static leases */
+};
+
+extern struct server_config_t server_config;
+extern struct dhcpOfferedAddr *leases;
+
+
+#endif
--- /dev/null
+.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).
--- /dev/null
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <time.h>
+
+#include "dhcpd.h"
+#include "leases.h"
+#include "libbb_udhcp.h"
+
+#define REMAINING 0
+#define ABSOLUTE 1
+
+
+#ifndef IN_BUSYBOX
+static void ATTRIBUTE_NORETURN show_usage(void)
+{
+ printf(
+"Usage: dumpleases -f <file> -[r|a]\n\n"
+" -f, --file=FILENAME Leases file to load\n"
+" -r, --remaining Interepret lease times as time remaing\n"
+" -a, --absolute Interepret lease times as expire time\n");
+ exit(0);
+}
+#else
+#define show_usage bb_show_usage
+#endif
+
+
+#ifdef IN_BUSYBOX
+int dumpleases_main(int argc, char *argv[])
+#else
+int main(int argc, char *argv[])
+#endif
+{
+ FILE *fp;
+ int i, c, mode = REMAINING;
+ long expires;
+ const char *file = LEASES_FILE;
+ struct dhcpOfferedAddr lease;
+ struct in_addr addr;
+
+ static const struct option options[] = {
+ {"absolute", 0, 0, 'a'},
+ {"remaining", 0, 0, 'r'},
+ {"file", 1, 0, 'f'},
+ {0, 0, 0, 0}
+ };
+
+ while (1) {
+ int option_index = 0;
+ c = getopt_long(argc, argv, "arf:", options, &option_index);
+ if (c == -1) break;
+
+ switch (c) {
+ case 'a': mode = ABSOLUTE; break;
+ case 'r': mode = REMAINING; break;
+ case 'f':
+ file = optarg;
+ break;
+ default:
+ show_usage();
+ }
+ }
+
+ fp = xfopen(file, "r");
+
+ printf("Mac Address IP-Address Expires %s\n", mode == REMAINING ? "in" : "at");
+ /* "00:00:00:00:00:00 255.255.255.255 Wed Jun 30 21:49:08 1993" */
+ while (fread(&lease, sizeof(lease), 1, fp)) {
+
+ for (i = 0; i < 6; i++) {
+ printf("%02x", lease.chaddr[i]);
+ if (i != 5) printf(":");
+ }
+ addr.s_addr = lease.yiaddr;
+ printf(" %-15s", inet_ntoa(addr));
+ expires = ntohl(lease.expires);
+ printf(" ");
+ if (mode == REMAINING) {
+ if (!expires) printf("expired\n");
+ else {
+ if (expires > 60*60*24) {
+ printf("%ld days, ", expires / (60*60*24));
+ expires %= 60*60*24;
+ }
+ if (expires > 60*60) {
+ printf("%ld hours, ", expires / (60*60));
+ expires %= 60*60;
+ }
+ if (expires > 60) {
+ printf("%ld minutes, ", expires / 60);
+ expires %= 60;
+ }
+ printf("%ld seconds\n", expires);
+ }
+ } else printf("%s", ctime(&expires));
+ }
+ fclose(fp);
+
+ return 0;
+}
--- /dev/null
+/*
+ * files.c -- DHCP server file manipulation *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <string.h>
+#include <stdlib.h>
+#include <time.h>
+#include <ctype.h>
+#include <netdb.h>
+
+#include <netinet/ether.h>
+#include "static_leases.h"
+
+#include "dhcpd.h"
+#include "options.h"
+#include "files.h"
+#include "common.h"
+
+/*
+ * Domain names may have 254 chars, and string options can be 254
+ * chars long. However, 80 bytes will be enough for most, and won't
+ * hog up memory. If you have a special application, change it
+ */
+#define READ_CONFIG_BUF_SIZE 80
+
+/* on these functions, make sure you datatype matches */
+static int read_ip(const 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_mac(const char *line, void *arg)
+{
+ uint8_t *mac_bytes = arg;
+ struct ether_addr *temp_ether_addr;
+ int retval = 1;
+
+ temp_ether_addr = ether_aton(line);
+
+ if(temp_ether_addr == NULL)
+ retval = 0;
+ else
+ memcpy(mac_bytes, temp_ether_addr, 6);
+
+ return retval;
+}
+
+
+static int read_str(const char *line, void *arg)
+{
+ char **dest = arg;
+
+ free(*dest);
+ *dest = strdup(line);
+
+ return 1;
+}
+
+
+static int read_u32(const char *line, void *arg)
+{
+ uint32_t *dest = arg;
+ char *endptr;
+ *dest = strtoul(line, &endptr, 0);
+ return endptr[0] == '\0';
+}
+
+
+static int read_yn(const 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;
+}
+
+
+/* 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 */
+static 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 = xmalloc(sizeof(struct option_set));
+ new->data = xmalloc(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;
+ }
+}
+
+
+/* read a dhcp option and add it to opt_list */
+static int read_opt(const char *const_line, void *arg)
+{
+ struct option_set **opt_list = arg;
+ char *opt, *val, *endptr;
+ struct dhcp_option *option;
+ int retval = 0, length;
+ char buffer[8];
+ char *line;
+ uint16_t *result_u16 = (uint16_t *) buffer;
+ uint32_t *result_u32 = (uint32_t *) buffer;
+
+ /* Cheat, the only const line we'll actually get is "" */
+ line = (char *) const_line;
+ if (!(opt = strtok(line, " \t="))) return 0;
+
+ for (option = dhcp_options; option->code; option++)
+ if (!strcasecmp(option->name, opt))
+ break;
+
+ if (!option->code) return 0;
+
+ do {
+ if (!(val = strtok(NULL, ", \t"))) break;
+ length = option_lengths[option->flags & TYPE_MASK];
+ retval = 0;
+ opt = buffer; /* new meaning for variable opt */
+ 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;
+ opt = val;
+ 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));
+ retval = (endptr[0] == '\0');
+ break;
+ case OPTION_S16:
+ *result_u16 = htons(strtol(val, &endptr, 0));
+ retval = (endptr[0] == '\0');
+ break;
+ case OPTION_U32:
+ *result_u32 = htonl(strtoul(val, &endptr, 0));
+ retval = (endptr[0] == '\0');
+ break;
+ case OPTION_S32:
+ *result_u32 = htonl(strtol(val, &endptr, 0));
+ retval = (endptr[0] == '\0');
+ break;
+ default:
+ break;
+ }
+ if (retval)
+ attach_option(opt_list, option, opt, length);
+ } while (retval && option->flags & OPTION_LIST);
+ return retval;
+}
+
+static int read_staticlease(const char *const_line, void *arg)
+{
+
+ char *line;
+ char *mac_string;
+ char *ip_string;
+ uint8_t *mac_bytes;
+ uint32_t *ip;
+
+
+ /* Allocate memory for addresses */
+ mac_bytes = xmalloc(sizeof(unsigned char) * 8);
+ ip = xmalloc(sizeof(uint32_t));
+
+ /* Read mac */
+ line = (char *) const_line;
+ mac_string = strtok(line, " \t");
+ read_mac(mac_string, mac_bytes);
+
+ /* Read ip */
+ ip_string = strtok(NULL, " \t");
+ read_ip(ip_string, ip);
+
+ addStaticLease(arg, mac_bytes, ip);
+
+#ifdef UDHCP_DEBUG
+ printStaticLeases(arg);
+#endif
+
+ return 1;
+
+}
+
+
+static const struct config_keyword keywords[] = {
+ /* keyword handler variable address default */
+ {"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), LEASES_FILE},
+ {"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), ""},
+ {"static_lease",read_staticlease, &(server_config.static_leases), ""},
+ /*ADDME: static lease */
+ {"", NULL, NULL, ""}
+};
+
+
+int read_config(const char *file)
+{
+ FILE *in;
+ char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
+#ifdef UDHCP_DEBUG
+ char orig[READ_CONFIG_BUF_SIZE];
+#endif
+ int i, lm = 0;
+
+ for (i = 0; keywords[i].keyword[0]; i++)
+ if (keywords[i].def[0])
+ 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, READ_CONFIG_BUF_SIZE, in)) {
+ lm++;
+ if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
+#ifdef UDHCP_DEBUG
+ strcpy(orig, buffer);
+#endif
+ if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
+
+ if (!(token = strtok(buffer, " \t"))) continue;
+ if (!(line = strtok(NULL, ""))) continue;
+
+ /* 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; keywords[i].keyword[0]; i++)
+ if (!strcasecmp(token, keywords[i].keyword))
+ if (!keywords[i].handler(line, keywords[i].var)) {
+ LOG(LOG_ERR, "Failure parsing line %d of %s", lm, file);
+ DEBUG(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 tmp_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) {
+
+ /* screw with the time in the struct, for easier writing */
+ tmp_time = leases[i].expires;
+
+ if (server_config.remaining) {
+ if (lease_expired(&(leases[i])))
+ leases[i].expires = 0;
+ else leases[i].expires -= curr;
+ } /* else stick with the time we got */
+ leases[i].expires = htonl(leases[i].expires);
+ fwrite(&leases[i], sizeof(struct dhcpOfferedAddr), 1, fp);
+
+ /* Then restore it when done. */
+ leases[i].expires = tmp_time;
+ }
+ }
+ fclose(fp);
+
+ if (server_config.notify_file) {
+ sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
+ system(buf);
+ }
+}
+
+
+void read_leases(const char *file)
+{
+ FILE *fp;
+ unsigned int i = 0;
+ struct dhcpOfferedAddr lease;
+
+ if (!(fp = fopen(file, "r"))) {
+ LOG(LOG_ERR, "Unable to open %s for reading", file);
+ return;
+ }
+
+ while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
+ /* ADDME: is it a static lease */
+ if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
+ lease.expires = ntohl(lease.expires);
+ if (!server_config.remaining) lease.expires -= time(0);
+ if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
+ LOG(LOG_WARNING, "Too many leases while loading %s\n", file);
+ break;
+ }
+ i++;
+ }
+ }
+ DEBUG(LOG_INFO, "Read %d leases", i);
+ fclose(fp);
+}
--- /dev/null
+/* files.h */
+#ifndef _FILES_H
+#define _FILES_H
+
+struct config_keyword {
+ const char *keyword;
+ int (* const handler)(const char *line, void *var);
+ void *var;
+ const char *def;
+};
+
+
+int read_config(const char *file);
+void write_leases(void);
+void read_leases(const char *file);
+
+struct option_set *find_option(struct option_set *opt_list, char code);
+
+#endif
--- /dev/null
+#include <string.h>
+
+extern int udhcpd_main(int argc, char *argv[]);
+extern int udhcpc_main(int argc, char *argv[]);
+
+int main(int argc, char *argv[])
+{
+ int ret = 0;
+ char *base = strrchr(argv[0], '/');
+
+ if (strstr(base ? (base + 1) : argv[0], "dhcpd"))
+ ret = udhcpd_main(argc, argv);
+ else ret = udhcpc_main(argc, argv);
+
+ return ret;
+}
--- /dev/null
+/*
+ * leases.c -- tools to manage DHCP leases
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+
+#include <time.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "dhcpd.h"
+#include "files.h"
+#include "options.h"
+#include "leases.h"
+#include "arpping.h"
+#include "common.h"
+
+#include "static_leases.h"
+
+
+uint8_t blank_chaddr[] = {[0 ... 15] = 0};
+
+/* clear every lease out that chaddr OR yiaddr matches and is nonzero */
+void clear_lease(uint8_t *chaddr, uint32_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(uint8_t *chaddr, uint32_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(uint8_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(uint32_t yiaddr)
+{
+ unsigned int i;
+
+ for (i = 0; i < server_config.max_leases; i++)
+ if (leases[i].yiaddr == yiaddr) return &(leases[i]);
+
+ return NULL;
+}
+
+
+/* check is an IP is taken, if it is, add it to the lease table */
+static int check_ip(uint32_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;
+}
+
+
+/* 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... */
+uint32_t find_address(int check_expired)
+{
+ uint32_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;
+
+ /* Only do if it isn't an assigned as a static lease */
+ if(!reservedIp(server_config.static_leases, htonl(addr)))
+ {
+
+ /* 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;
+}
--- /dev/null
+/* leases.h */
+#ifndef _LEASES_H
+#define _LEASES_H
+
+
+struct dhcpOfferedAddr {
+ uint8_t chaddr[16];
+ uint32_t yiaddr; /* network order */
+ uint32_t expires; /* host order */
+};
+
+extern uint8_t blank_chaddr[];
+
+void clear_lease(uint8_t *chaddr, uint32_t yiaddr);
+struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
+int lease_expired(struct dhcpOfferedAddr *lease);
+struct dhcpOfferedAddr *oldest_expired_lease(void);
+struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr);
+struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
+uint32_t find_address(int check_expired);
+
+
+#endif
--- /dev/null
+/* libbb_udhcp.h - busybox compatibility wrapper */
+
+/* bit of a hack, do this no matter what the order of the includes.
+ * (for busybox) */
+
+#ifndef _LIBBB_UDHCP_H
+#define _LIBBB_UDHCP_H
+
+#ifdef CONFIG_INSTALL_NO_USR
+# define DEFAULT_SCRIPT "/share/udhcpc/default.script"
+#else
+# define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
+#endif
+
+#ifdef IN_BUSYBOX
+#include "busybox.h"
+
+#ifdef CONFIG_FEATURE_UDHCP_SYSLOG
+#define UDHCP_SYSLOG
+#endif
+
+#ifdef CONFIG_FEATURE_UDHCP_DEBUG
+#define UDHCP_DEBUG
+#endif
+
+#define COMBINED_BINARY
+#include "version.h"
+
+#define xfopen bb_xfopen
+
+/* make safe the exported namespace */
+/* from common.h */
+#define background udhcp_background
+#define start_log_and_pid udhcp_start_log_and_pid
+/* from script.h */
+#define run_script udhcp_run_script
+/* from packet.h */
+#define init_header udhcp_init_header
+#define get_packet udhcp_get_packet
+#define checksum udhcp_checksum
+#define raw_packet udhcp_raw_packet
+#define kernel_packet udhcp_kernel_packet
+/* from pidfile.h */
+#define pidfile_acquire udhcp_pidfile_acquire
+#define pidfile_write_release udhcp_pidfile_write_release
+/* from options.h */
+#define get_option udhcp_get_option
+#define end_option udhcp_end_option
+#define add_option_string udhcp_add_option_string
+#define add_simple_option udhcp_add_simple_option
+#define option_lengths udhcp_option_lengths
+/* from socket.h */
+#define listen_socket udhcp_listen_socket
+#define read_interface udhcp_read_interface
+/* from dhcpc.h */
+#define client_config udhcp_client_config
+/* from dhcpd.h */
+#define server_config udhcp_server_config
+
+#else /* ! IN_BUSYBOX */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/sysinfo.h>
+
+#ifndef ATTRIBUTE_NORETURN
+#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
+#endif /* ATTRIBUTE_NORETURN */
+
+#ifndef ATTRIBUTE_PACKED
+#define ATTRIBUTE_PACKED __attribute__ ((__packed__))
+#endif /* ATTRIBUTE_PACKED */
+
+#define TRUE 1
+#define FALSE 0
+
+#define xmalloc malloc
+#define xcalloc calloc
+
+static inline FILE *xfopen(const char *file, const char *mode)
+{
+ FILE *fp;
+ if (!(fp = fopen(file, mode))) {
+ perror("could not open input file");
+ exit(0);
+ }
+ return fp;
+}
+
+#endif /* IN_BUSYBOX */
+
+#endif /* _LIBBB_UDHCP_H */
--- /dev/null
+/*
+ * options.c -- DHCP server option packet tools
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+#include "dhcpd.h"
+#include "options.h"
+#include "files.h"
+
+
+/* supported options are easily added here */
+struct dhcp_option dhcp_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},
+ {"nisdomain", OPTION_STRING | OPTION_REQ, 0x28},
+ {"nissrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 0x29},
+ {"ntpsrv", OPTION_IP | OPTION_LIST | OPTION_REQ, 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). */
+uint8_t *get_option(struct dhcpMessage *packet, int code)
+{
+ int i, length;
+ uint8_t *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(uint8_t *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(uint8_t *optionptr, uint8_t *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(uint8_t *optionptr, uint8_t code, uint32_t data)
+{
+ struct dhcp_option *dh;
+
+ for (dh=dhcp_options; dh->code; dh++) {
+ if (dh->code == code) {
+ uint8_t option[6], len;
+
+ option[OPT_CODE] = code;
+ len = option_lengths[dh->flags & TYPE_MASK];
+ option[OPT_LEN] = len;
+ if (__BYTE_ORDER == __BIG_ENDIAN)
+ data <<= 8 * (4 - len);
+ /* This memcpy is for broken processors which can't
+ * handle a simple unaligned 32-bit assignment */
+ memcpy(&option[OPT_DATA], &data, 4);
+ return add_option_string(optionptr, option);
+ }
+ }
+
+ DEBUG(LOG_ERR, "Could not add option 0x%02x", code);
+ return 0;
+}
--- /dev/null
+/* options.h */
+#ifndef _OPTIONS_H
+#define _OPTIONS_H
+
+#include "packet.h"
+
+#define TYPE_MASK 0x0F
+
+enum {
+ OPTION_IP=1,
+ OPTION_IP_PAIR,
+ OPTION_STRING,
+ OPTION_BOOLEAN,
+ OPTION_U8,
+ OPTION_U16,
+ OPTION_S16,
+ OPTION_U32,
+ OPTION_S32
+};
+
+#define OPTION_REQ 0x10 /* have the client request this option */
+#define OPTION_LIST 0x20 /* There can be a list of 1 or more of these */
+
+struct dhcp_option {
+ char name[10];
+ char flags;
+ uint8_t code;
+};
+
+extern struct dhcp_option dhcp_options[];
+extern int option_lengths[];
+
+uint8_t *get_option(struct dhcpMessage *packet, int code);
+int end_option(uint8_t *optionptr);
+int add_option_string(uint8_t *optionptr, uint8_t *string);
+int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data);
+
+#endif
--- /dev/null
+#include <unistd.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <features.h>
+#if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
+#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 "common.h"
+#include "packet.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)
+{
+ static const char broken_vendors[][8] = {
+ "MSFT 98",
+ ""
+ };
+ int bytes;
+ int i;
+ 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] == (uint8_t) strlen(broken_vendors[i]) &&
+ !strncmp((char*)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;
+}
+
+
+uint16_t checksum(void *addr, int count)
+{
+ /* Compute Internet Checksum for "count" bytes
+ * beginning at location "addr".
+ */
+ register int32_t sum = 0;
+ uint16_t *source = (uint16_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 */
+ uint16_t tmp = 0;
+ *(uint8_t *) (&tmp) = * (uint8_t *) source;
+ sum += tmp;
+ }
+ /* Fold 32-bit sum to 16 bits */
+ while (sum >> 16)
+ sum = (sum & 0xffff) + (sum >> 16);
+
+ return ~sum;
+}
+
+
+/* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
+int raw_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
+ uint32_t dest_ip, int dest_port, uint8_t *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: %m");
+ 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: %m");
+ 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: %m");
+ }
+ close(fd);
+ return result;
+}
+
+
+/* Let the kernel do all the work for packet generation */
+int kernel_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
+ uint32_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) {
+ close(fd);
+ 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) {
+ close(fd);
+ 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) {
+ close(fd);
+ return -1;
+ }
+
+ result = write(fd, payload, sizeof(struct dhcpMessage));
+ close(fd);
+ return result;
+}
--- /dev/null
+#ifndef _PACKET_H
+#define _PACKET_H
+
+#include <netinet/udp.h>
+#include <netinet/ip.h>
+
+struct dhcpMessage {
+ uint8_t op;
+ uint8_t htype;
+ uint8_t hlen;
+ uint8_t hops;
+ uint32_t xid;
+ uint16_t secs;
+ uint16_t flags;
+ uint32_t ciaddr;
+ uint32_t yiaddr;
+ uint32_t siaddr;
+ uint32_t giaddr;
+ uint8_t chaddr[16];
+ uint8_t sname[64];
+ uint8_t file[128];
+ uint32_t cookie;
+ uint8_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);
+uint16_t checksum(void *addr, int count);
+int raw_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
+ uint32_t dest_ip, int dest_port, uint8_t *dest_arp, int ifindex);
+int kernel_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
+ uint32_t dest_ip, int dest_port);
+
+
+#endif
--- /dev/null
+/* pidfile.c
+ *
+ * Functions to assist in the writing and removing of pidfiles.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> September 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 <stdio.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "pidfile.h"
+
+static char *saved_pidfile;
+
+static void pidfile_delete(void)
+{
+ if (saved_pidfile) unlink(saved_pidfile);
+}
+
+
+int pidfile_acquire(const char *pidfile)
+{
+ int pid_fd;
+ if (!pidfile) return -1;
+
+ pid_fd = open(pidfile, O_CREAT | O_WRONLY, 0644);
+ if (pid_fd < 0) {
+ LOG(LOG_ERR, "Unable to open pidfile %s: %m\n", pidfile);
+ } else {
+ lockf(pid_fd, F_LOCK, 0);
+ if (!saved_pidfile)
+ atexit(pidfile_delete);
+ saved_pidfile = (char *) pidfile;
+ }
+
+ 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);
+}
+
+
+
+
--- /dev/null
+/* pidfile.h
+ *
+ * Functions to assist in the writing and removing of pidfiles.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> September 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(const char *pidfile);
+void pidfile_write_release(int pid_fd);
+
--- /dev/null
+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.
--- /dev/null
+#!/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
\ No newline at end of file
--- /dev/null
+#!/bin/sh
+# Sample udhcpc deconfig script
+
+/sbin/ifconfig $interface 0.0.0.0
--- /dev/null
+#!/bin/sh
+# Sample udhcpc nak script
+
+echo Received a NAK: $message
--- /dev/null
+#!/bin/sh
+# Sample udhcpc bound script
+
+RESOLV_CONF="/etc/udhcpc/resolv.conf"
+
+[ -n "$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
\ No newline at end of file
--- /dev/null
+#!/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
--- /dev/null
+#!/bin/sh
+
+# udhcpc script edited by Tim Riker <Tim@Rikers.org>
+
+[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1
+
+RESOLV_CONF="/etc/resolv.conf"
+[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
+[ -n "$subnet" ] && NETMASK="netmask $subnet"
+
+case "$1" in
+ deconfig)
+ /sbin/ifconfig $interface 0.0.0.0
+ ;;
+
+ renew|bound)
+ /sbin/ifconfig $interface $ip $BROADCAST $NETMASK
+
+ if [ -n "$router" ] ; then
+ echo "deleting routers"
+ while route del default gw 0.0.0.0 dev $interface ; do
+ :
+ done
+
+ for i in $router ; do
+ route add default gw $i dev $interface
+ done
+ fi
+
+ echo -n > $RESOLV_CONF
+ [ -n "$domain" ] && echo search $domain >> $RESOLV_CONF
+ for i in $dns ; do
+ echo adding dns $i
+ echo nameserver $i >> $RESOLV_CONF
+ done
+ ;;
+esac
+
+exit 0
--- /dev/null
+# Sample udhcpd configuration file (/etc/udhcpd.conf)
+
+# The start and end of the IP lease block
+
+start 192.168.0.20 #default: 192.168.0.20
+end 192.168.0.254 #default: 192.168.0.254
+
+
+# The interface that udhcpd will use
+
+interface eth0 #default: eth0
+
+
+# The maximim number of leases (includes addressesd reserved
+# by OFFER's, DECLINE's, and ARP conficts
+
+#max_leases 254 #default: 254
+
+
+# If remaining is true (default), udhcpd will store the time
+# remaining for each lease in the udhcpd leases file. This is
+# for embedded systems that cannot keep time between reboots.
+# If you set remaining to no, the absolute time that the lease
+# expires at will be stored in the dhcpd.leases file.
+
+#remaining yes #default: yes
+
+
+# The time period at which udhcpd will write out a dhcpd.leases
+# file. If this is 0, udhcpd will never automatically write a
+# lease file. (specified in seconds)
+
+#auto_time 7200 #default: 7200 (2 hours)
+
+
+# The amount of time that an IP will be reserved (leased) for if a
+# DHCP decline message is received (seconds).
+
+#decline_time 3600 #default: 3600 (1 hour)
+
+
+# The amount of time that an IP will be reserved (leased) for if an
+# ARP conflct occurs. (seconds
+
+#conflict_time 3600 #default: 3600 (1 hour)
+
+
+# How long an offered address is reserved (leased) in seconds
+
+#offer_time 60 #default: 60 (1 minute)
+
+# If a lease to be given is below this value, the full lease time is
+# instead used (seconds).
+
+#min_lease 60 #defult: 60
+
+
+# The location of the leases file
+
+#lease_file /var/lib/misc/udhcpd.leases #defualt: /var/lib/misc/udhcpd.leases
+
+# The location of the pid file
+#pidfile /var/run/udhcpd.pid #default: /var/run/udhcpd.pid
+
+# Everytime udhcpd writes a leases file, the below script will be called.
+# Useful for writing the lease file to flash every few hours.
+
+#notify_file #default: (no script)
+
+#notify_file dumpleases # <--- usefull for debugging
+
+# The following are bootp specific options, setable by udhcpd.
+
+#siaddr 192.168.0.22 #default: 0.0.0.0
+
+#sname zorak #default: (none)
+
+#boot_file /var/nfs_root #default: (none)
+
+# The remainer of options are DHCP options and can be specifed with the
+# keyword 'opt' or 'option'. If an option can take multiple items, such
+# as the dns option, they can be listed on the same line, or multiple
+# lines. The only option with a default is 'lease'.
+
+#Examles
+opt dns 192.168.10.2 192.168.10.10
+option subnet 255.255.255.0
+opt router 192.168.10.2
+opt wins 192.168.10.10
+option dns 129.219.13.81 # appened to above DNS servers for a total of 3
+option domain local
+option lease 864000 # 10 days of seconds
+
+
+# Currently supported options, for more info, see options.c
+#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
--- /dev/null
+/* script.c
+ *
+ * Functions to call the DHCP client notification scripts
+ *
+ * Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include "common.h"
+#include "options.h"
+#include "dhcpd.h"
+#include "dhcpc.h"
+#include "script.h"
+
+/* get a rough idea of how long an option will be (rounding up...) */
+static const 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 inline int upper_length(int length, int opt_index)
+{
+ return max_option_length[opt_index] *
+ (length / option_lengths[opt_index]);
+}
+
+
+static int sprintip(char *dest, char *pre, uint8_t *ip)
+{
+ return sprintf(dest, "%s%d.%d.%d.%d", pre, ip[0], ip[1], ip[2], ip[3]);
+}
+
+
+/* really simple implementation, just count the bits */
+static int mton(struct in_addr *mask)
+{
+ int i;
+ unsigned long bits = ntohl(mask->s_addr);
+ /* too bad one can't check the carry bit, etc in c bit
+ * shifting */
+ for (i = 0; i < 32 && !((bits >> i) & 1); i++);
+ return 32 - i;
+}
+
+
+/* Fill dest with the text of option 'option'. */
+static void fill_options(char *dest, uint8_t *option, struct dhcp_option *type_p)
+{
+ int type, optlen;
+ uint16_t val_u16;
+ int16_t val_s16;
+ uint32_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;
+ dest += sprintf(dest, " ");
+ }
+}
+
+
+/* put all the parameters into an environment */
+static char **fill_envp(struct dhcpMessage *packet)
+{
+ int num_options = 0;
+ int i, j;
+ char **envp;
+ uint8_t *temp;
+ struct in_addr subnet;
+ char over = 0;
+
+ if (packet == NULL)
+ num_options = 0;
+ else {
+ for (i = 0; dhcp_options[i].code; i++)
+ if (get_option(packet, dhcp_options[i].code)) {
+ num_options++;
+ if (dhcp_options[i].code == DHCP_SUBNET)
+ num_options++; /* for mton */
+ }
+ 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 = xcalloc(sizeof(char *), num_options + 5);
+ j = 0;
+ asprintf(&envp[j++], "interface=%s", client_config.interface);
+ asprintf(&envp[j++], "%s=%s", "PATH",
+ getenv("PATH") ? : "/bin:/usr/bin:/sbin:/usr/sbin");
+ asprintf(&envp[j++], "%s=%s", "HOME", getenv("HOME") ? : "/");
+
+ if (packet == NULL) return envp;
+
+ envp[j] = xmalloc(sizeof("ip=255.255.255.255"));
+ sprintip(envp[j++], "ip=", (uint8_t *) &packet->yiaddr);
+
+
+ for (i = 0; dhcp_options[i].code; i++) {
+ if (!(temp = get_option(packet, dhcp_options[i].code)))
+ continue;
+ envp[j] = xmalloc(upper_length(temp[OPT_LEN - 2],
+ dhcp_options[i].flags & TYPE_MASK) + strlen(dhcp_options[i].name) + 2);
+ fill_options(envp[j++], temp, &dhcp_options[i]);
+
+ /* Fill in a subnet bits option for things like /24 */
+ if (dhcp_options[i].code == DHCP_SUBNET) {
+ memcpy(&subnet, temp, 4);
+ asprintf(&envp[j++], "mask=%d", mton(&subnet));
+ }
+ }
+ if (packet->siaddr) {
+ envp[j] = xmalloc(sizeof("siaddr=255.255.255.255"));
+ sprintip(envp[j++], "siaddr=", (uint8_t *) &packet->siaddr);
+ }
+ if (!(over & FILE_FIELD) && packet->file[0]) {
+ /* watch out for invalid packets */
+ packet->file[sizeof(packet->file) - 1] = '\0';
+ asprintf(&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';
+ asprintf(&envp[j++], "sname=%s", packet->sname);
+ }
+ 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, **curr;
+
+ if (client_config.script == NULL)
+ return;
+
+ DEBUG(LOG_INFO, "vforking and execle'ing %s", client_config.script);
+
+ envp = fill_envp(packet);
+ /* call script */
+ pid = vfork();
+ if (pid) {
+ waitpid(pid, NULL, 0);
+ for (curr = envp; *curr; curr++) free(*curr);
+ free(envp);
+ return;
+ } else if (pid == 0) {
+ /* close fd's? */
+
+ /* exec script */
+ execle(client_config.script, client_config.script,
+ name, NULL, envp);
+ LOG(LOG_ERR, "script %s failed: %m", client_config.script);
+ exit(1);
+ }
+}
--- /dev/null
+#ifndef _SCRIPT_H
+#define _SCRIPT_H
+
+extern void run_script(struct dhcpMessage *packet, const char *name);
+
+#endif
--- /dev/null
+/* serverpacket.c
+ *
+ * Construct 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 "common.h"
+#include "serverpacket.h"
+#include "dhcpd.h"
+#include "options.h"
+#include "static_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)
+{
+ uint8_t *chaddr;
+ uint32_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((char*)packet->sname, server_config.sname, sizeof(packet->sname) - 1);
+ if (server_config.boot_file)
+ strncpy((char*)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;
+ uint32_t req_align, lease_time_align = server_config.lease;
+ uint8_t *req, *lease_time;
+ struct option_set *curr;
+ struct in_addr addr;
+
+ uint32_t static_lease_ip;
+
+ init_packet(&packet, oldpacket, DHCPOFFER);
+
+ static_lease_ip = getIpByMac(server_config.static_leases, oldpacket->chaddr);
+
+ /* ADDME: if static, short circuit */
+ if(!static_lease_ip)
+ {
+ /* 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) &&
+
+ !static_lease_ip && /* Check that its not a static lease */
+ /* and is not already taken/offered */
+ ((!(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 */
+ } else {
+ /* Is it a static lease? (No, because find_address skips static lease) */
+ 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 */
+ else
+ {
+ /* It is a static lease... use it */
+ packet.yiaddr = static_lease_ip;
+ }
+
+ 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, uint32_t yiaddr)
+{
+ struct dhcpMessage packet;
+ struct option_set *curr;
+ uint8_t *lease_time;
+ uint32_t lease_time_align = server_config.lease;
+ struct in_addr addr;
+
+ init_packet(&packet, oldpacket, DHCPACK);
+ packet.yiaddr = yiaddr;
+
+ if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
+ memcpy(&lease_time_align, lease_time, 4);
+ lease_time_align = ntohl(lease_time_align);
+ if (lease_time_align > server_config.lease)
+ lease_time_align = server_config.lease;
+ else if (lease_time_align < server_config.min_lease)
+ lease_time_align = server_config.lease;
+ }
+
+ add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));
+
+ curr = server_config.options;
+ while (curr) {
+ if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
+ add_option_string(packet.options, curr->data);
+ curr = curr->next;
+ }
+
+ add_bootp_options(&packet);
+
+ addr.s_addr = packet.yiaddr;
+ LOG(LOG_INFO, "sending ACK to %s", inet_ntoa(addr));
+
+ if (send_packet(&packet, 0) < 0)
+ return -1;
+
+ add_lease(packet.chaddr, packet.yiaddr, lease_time_align);
+
+ return 0;
+}
+
+
+int send_inform(struct dhcpMessage *oldpacket)
+{
+ struct dhcpMessage packet;
+ struct option_set *curr;
+
+ init_packet(&packet, oldpacket, DHCPACK);
+
+ curr = server_config.options;
+ while (curr) {
+ if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
+ add_option_string(packet.options, curr->data);
+ curr = curr->next;
+ }
+
+ add_bootp_options(&packet);
+
+ return send_packet(&packet, 0);
+}
--- /dev/null
+#ifndef _SERVERPACKET_H
+#define _SERVERPACKET_H
+
+#include "packet.h"
+
+int sendOffer(struct dhcpMessage *oldpacket);
+int sendNAK(struct dhcpMessage *oldpacket);
+int sendACK(struct dhcpMessage *oldpacket, uint32_t yiaddr);
+int send_inform(struct dhcpMessage *oldpacket);
+
+
+#endif
--- /dev/null
+/* signalpipe.c
+ *
+ * Signal pipe infrastructure. A reliable way of delivering signals.
+ *
+ * Russ Dill <Russ.Dill@asu.edu> December 2003
+ *
+ * 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 <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/select.h>
+
+
+#include "signalpipe.h"
+#include "common.h"
+
+static int signal_pipe[2];
+
+static void signal_handler(int sig)
+{
+ if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0)
+ DEBUG(LOG_ERR, "Could not send signal: %m");
+}
+
+
+/* Call this before doing anything else. Sets up the socket pair
+ * and installs the signal handler */
+void udhcp_sp_setup(void)
+{
+ socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
+ fcntl(signal_pipe[0], F_SETFD, FD_CLOEXEC);
+ fcntl(signal_pipe[1], F_SETFD, FD_CLOEXEC);
+ signal(SIGUSR1, signal_handler);
+ signal(SIGUSR2, signal_handler);
+ signal(SIGTERM, signal_handler);
+}
+
+
+/* Quick little function to setup the rfds. Will return the
+ * max_fd for use with select. Limited in that you can only pass
+ * one extra fd */
+int udhcp_sp_fd_set(fd_set *rfds, int extra_fd)
+{
+ FD_ZERO(rfds);
+ FD_SET(signal_pipe[0], rfds);
+ if (extra_fd >= 0) {
+ fcntl(extra_fd, F_SETFD, FD_CLOEXEC);
+ FD_SET(extra_fd, rfds);
+ }
+ return signal_pipe[0] > extra_fd ? signal_pipe[0] : extra_fd;
+}
+
+
+/* Read a signal from the signal pipe. Returns 0 if there is
+ * no signal, -1 on error (and sets errno appropriately), and
+ * your signal on success */
+int udhcp_sp_read(fd_set *rfds)
+{
+ int sig;
+
+ if (!FD_ISSET(signal_pipe[0], rfds))
+ return 0;
+
+ if (read(signal_pipe[0], &sig, sizeof(sig)) < 0)
+ return -1;
+
+ return sig;
+}
--- /dev/null
+/* signalpipe.h
+ *
+ * Russ Dill <Russ.Dill@asu.edu> December 2003
+ *
+ * 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.
+ */
+
+void udhcp_sp_setup(void);
+int udhcp_sp_fd_set(fd_set *rfds, int extra_fd);
+int udhcp_sp_read(fd_set *rfds);
--- /dev/null
+/*
+ * socket.c -- DHCP server client/server socket creation
+ *
+ * udhcp client/server
+ * Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
+ * Chris Trew <ctrew@moreton.com.au>
+ *
+ * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <errno.h>
+#include <features.h>
+#if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
+#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 "common.h"
+#include "socket.h"
+
+int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *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?: %m");
+ close(fd);
+ 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!: %m");
+ close(fd);
+ 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!: %m");
+ close(fd);
+ return -1;
+ }
+ } else {
+ LOG(LOG_ERR, "socket failed!: %m");
+ return -1;
+ }
+ close(fd);
+ return 0;
+}
+
+
+int listen_socket(uint32_t 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", ip, port, inf);
+ if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
+ DEBUG(LOG_ERR, "socket call failed: %m");
+ 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_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;
+}
--- /dev/null
+/* socket.h */
+#ifndef _SOCKET_H
+#define _SOCKET_H
+
+int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp);
+int listen_socket(uint32_t ip, int port, char *inf);
+
+#endif
--- /dev/null
+/*
+ * static_leases.c -- Couple of functions to assist with storing and
+ * retrieving data for static leases
+ *
+ * Wade Berrier <wberrier@myrealbox.com> September 2004
+ *
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "static_leases.h"
+#include "dhcpd.h"
+
+/* Takes the address of the pointer to the static_leases linked list,
+ * Address to a 6 byte mac address
+ * Address to a 4 byte ip address */
+int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip)
+{
+
+ struct static_lease *cur;
+ struct static_lease *new_static_lease;
+
+ /* Build new node */
+ new_static_lease = xmalloc(sizeof(struct static_lease));
+ new_static_lease->mac = mac;
+ new_static_lease->ip = ip;
+ new_static_lease->next = NULL;
+
+ /* If it's the first node to be added... */
+ if(*lease_struct == NULL)
+ {
+ *lease_struct = new_static_lease;
+ }
+ else
+ {
+ cur = *lease_struct;
+ while(cur->next != NULL)
+ {
+ cur = cur->next;
+ }
+
+ cur->next = new_static_lease;
+ }
+
+ return 1;
+
+}
+
+/* Check to see if a mac has an associated static lease */
+uint32_t getIpByMac(struct static_lease *lease_struct, void *arg)
+{
+ uint32_t return_ip;
+ struct static_lease *cur = lease_struct;
+ uint8_t *mac = arg;
+
+ return_ip = 0;
+
+ while(cur != NULL)
+ {
+ /* If the client has the correct mac */
+ if(memcmp(cur->mac, mac, 6) == 0)
+ {
+ return_ip = *(cur->ip);
+ }
+
+ cur = cur->next;
+ }
+
+ return return_ip;
+
+}
+
+/* Check to see if an ip is reserved as a static ip */
+uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip)
+{
+ struct static_lease *cur = lease_struct;
+
+ uint32_t return_val = 0;
+
+ while(cur != NULL)
+ {
+ /* If the client has the correct ip */
+ if(*cur->ip == ip)
+ return_val = 1;
+
+ cur = cur->next;
+ }
+
+ return return_val;
+
+}
+
+#ifdef UDHCP_DEBUG
+/* Print out static leases just to check what's going on */
+/* Takes the address of the pointer to the static_leases linked list */
+void printStaticLeases(struct static_lease **arg)
+{
+ /* Get a pointer to the linked list */
+ struct static_lease *cur = *arg;
+
+ while(cur != NULL)
+ {
+ /* printf("PrintStaticLeases: Lease mac Address: %x\n", cur->mac); */
+ printf("PrintStaticLeases: Lease mac Value: %x\n", *(cur->mac));
+ /* printf("PrintStaticLeases: Lease ip Address: %x\n", cur->ip); */
+ printf("PrintStaticLeases: Lease ip Value: %x\n", *(cur->ip));
+
+ cur = cur->next;
+ }
+
+
+}
+#endif
+
+
+
--- /dev/null
+/* static_leases.h */
+#ifndef _STATIC_LEASES_H
+#define _STATIC_LEASES_H
+
+#include "dhcpd.h"
+
+/* Config file will pass static lease info to this function which will add it
+ * to a data structure that can be searched later */
+int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip);
+
+/* Check to see if a mac has an associated static lease */
+uint32_t getIpByMac(struct static_lease *lease_struct, void *arg);
+
+/* Check to see if an ip is reserved as a static ip */
+uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip);
+
+#ifdef UDHCP_DEBUG
+/* Print out static leases just to check what's going on */
+void printStaticLeases(struct static_lease **lease_struct);
+#endif
+
+#endif
+
+
+
--- /dev/null
+.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.
--- /dev/null
+.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).
--- /dev/null
+.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).
--- /dev/null
+#ifndef _UDHCP_VERSION_H
+#define _UDHCP_VERSION_H
+
+#define VERSION "0.9.9-pre"
+
+#endif
projects / oweals / busybox.git / commitdiff