http://cuiwww.unige.ch/info/pc/remote-boot/howto.html.
Linuxdoc-SGML,
DVI and
PostScript
versions are available in the same directory.
If you are interested in getting info on further developpments, send
an E-mail to
[email protected].
This document and the related software are provided as is to the Linux and Internet community, with no form of warranty. Please note that some operations related in this document may destroy the content of your hard-disk. We assume no liability for any use, correct or not, of this document and of the related software.
You are free to do anything you want with the remote-boot tools as long as you do not make money by selling them or by distributing them with a commercial product. If you want to commercialize a product derived from these tools, please contact the authors first to make a commercial agreement. These remote-boot tools will remain available for free forever, but we may authorize derived commercial tools.
These provisions shall be interpreted under and in accordance with the laws of Switzerland, canton of Geneva. All disputes, defenses, controversies or claims arrising in conncetion with this document and the related software, shall be subject to the exclusive juridiction of the courts of the canton of Geneva, Switzerland.
If you like this program, you can send us a Postcard and/or make a gift to the International Committee of the Red Cross (ICRC) or to the UNICEF.
To say it frankly, almost everything. The underlying concepts are the same, but the software part has been completly redesigned to overcome the limitations of previous versions and to make it easier to use. An highlight of the new features :
No, because the internal format is radically different. But you can easily do the conversion by yourself:
unzipreg utility and replace them
by the adequate patch commands (it is very easy, see
the detailed instructions below)mrzip program to create a new-style disk imageVersion 3.0 was the beta-release. A dozen of sites around the world have tested it during a month and given much of their time to help us finding bugs and to suggest enhancements. Thanks to all of them for their patience, and in particular to Maciek Uhlig, Dick Velders and Jeff Teeters.
A few minor features have been added since 3.01, such as support for diskless Linux boot (by disabling the cache).
Version 3.10 introduced compatibility with Intel's Wired for Management 1.1a NetPC standard. The tools now work with any PXE-compliant boot ROM (as are most on-board boot ROMs) available today. Thanks to InCom GmbH for giving us the PXE bootprom that permitted this developpment. We also succesfully tested the tools with the PXE Boot ROM that I found incidentally in my Dell computer with onboard network card (called LanDesk Service Agent).
Version 3.11 to 3.12 added UNIX server-side tools (a PXE Proxy DHCP server for Solaris and Linux, and an enhanced TFTP server for Linux), as well as detailled informations on server-side setup and the PXE booting process.
Version 3.13 added Advanced Power Management support (PowerOff command).
Version 3.14 added minor enhancements and some corrections. We fixed a problem with the terminal under RedHat 5.1, and another problem in the syntax of the "if" command. We added some features suggested by the Laboratori de Càlcul de la Facultat d'Informàtica de Barcelona (LCFIB) :
Version 3.15 added full VESA support. BpBatch now support several video modes, to accomodate old computers not being able to display 800x600 graphics. A new parameter has been added to InitGraph to specify the video mode, and a list of detected video mode can be retrieved from the new VESA-Modes variable.
Version 3.16 fixes the following bugs:
Version 3.17 adds some minor features and fixes bugs:
Version 3.18 fixes a bug with the IncrUnzip function. Thanks to Gary Pike for its collaboration.
Version 3.19 fixed a bug in the error handling of the delete command
on ext2fs, as well as the inappropriate handling of names starting with
A: under Linux. The following new features were also added:
if valid disk:partition syntax can be used to check
if a partition has been formattedCacheNever to "ON". This might be
usefull for a unique installation, but is not recommended in
general is it results in a high network load.
The configuration described here was developped since Summer 1996 at the CUI, University of Geneva. The Computer Science Department uses several servers and a number of PCs, which fall into two classes:
http://www.intel.com/managedpc.
Bootproms exist for quite a long time, but until recently, they were solely used with diskless computers. Since 1996, this How-to has been claiming that bootproms are even more interesting for computers which have a local harddisk, since they allow to take profit of both sides:
Note that you can still use the tools described below in an old fashioned way, that is as a simple kernel/ramdisk loader, even for diskless computers. However, we do not encourage this use.
The University of Geneva owns a class B domain, subdivided into several subnets. The CUI uses four subnets, among them one is dedicated to students.
Originally, our PCs were concerned about two network protocols: IPX and IP. On the IPX side, we used a single Novell Netware 3 server for sharing software and users files for DOS and Windows. On the IP side, we used a SUN server for sharing software and users partitions for Linux, with NFS.
In our latest configuration, we do not any more use IPX. There is a single Unix server (which could be Linux as well as a SUN), sharing software and user files using NFS for Linux clients and using SMB (NetBIOS) over TCP/IP for Dos and Windows clients. In this way, we have a single home directory used by all operating systems.
bpbatch, our boot-time batch
file interpreter.disk1 to disk4)
as SMB client. Microsoft LanManager supports dynamic
configuration using DHCP. After logging in, the user
is faced to DOS, and can start Windows 3.1 by typing
the traditional win command. Note that at this point,
DOS and Windows 3.1 appear to be installed locally.
For Windows 95 and Windows NT, we also use Microsoft SMB client
(called Client for the Microsoft Network), that supports
dynamic configuration using DHCP. We reduce network load using
Shared LAN Cache,
a nice and powerful network-to-disk cache program.For "safe" computers (ie. for assistants computers), once the computer has been booted once using the above described system, the boot script simply redirect the boot to the local hard-disk, without cleaning it again. This allow users to leave data on their local hard disk. But whenever the configuration gets corrupted, the user can simply choose from the boot menu in order to have a fresh installation.
This configuration has been successfully reproduced at several places
around the world. A few people have written some hints and tricks that
complement this How-To. If you did so and that your page is not
already referenced in this documentation, please send
an e-mail to [email protected].
And if you experience problems while reproducing this configuration,
have a look at these pages !
http://www.br.fgov.be/RESEARCH/INFORMATICS/info/bootp.html,
by Alain Empain of the Belgium National Botanic Garden.
Many useful sample scripts, and a nice PERL program to
automatically generate graphic menus and corresponding HTML
documentation from a higher level description.
http://www.katedral.se/system/elevsyst,
by Johan Carlstedt of The Cathedral School of Uppsala, Sweden.
At this day, the configuration described at this place
is still based on the previous version of the remote-boot
tools. However, almost everything remains applicable, given
a few changes.
http://vitoria.upf.tche.br/~fred/,
in portuguese, by Frederico Goldschmidt of the Passo Fundo
University, Brasil.
http://www.etse.urv.es/~larinyo, in spanish,
by Lluis Arino, of the Escola Tecnica Superio d'Enginyeria,
Spain.You can also send me your BpBatch script if you want me to include it in the sample scripts collection.
First, arrange to have the following two machines within arm's reach:
http://www.incom.de.
This diskette will make your computer behave like if it had a TCP/IP
Bootprom plugged in.
If you already have a Boot ROM, you need to enable it. If you are using Incom TCP/IP Bootprom, you can do that using a special program from your network card manufacturer. If you have a PXE Bootprom, you can do it simply from BIOS setup, by changing the default boot device.
For student computers, we configured the boot on network first, and disabled hard-disk and floppy-disk boot. For assistant computers, we also configured network-boot first, but we allow hard-disk and floppy-disk boot.
On the server, you will need the following services:
ndd /dev/ip ip_path_mtu_discovery to see if you have it enabled
and ndd -set /dev/ip ip_path_mtu_discovery 0 to disable it.
However, this fix only works for non-broadcast packets (ask SUN why...).
That means, it will work for TFTP but not for DHCP :-(. Intel has recently
fixed this bug, and if you bought your computer after June 1998, you surely
have a corrected PXE implementation.
The role of the DHCP server is to give to the client an IP
address and to make it load the
file named bpbatch.P from the TFTP server.
DHCP is a superprotocol over BOOTP. If you are using InCom
TCP/IP Bootprom, you may live without DHCP (using an old BOOTP server).
On Windows NT, you will probably use the native DHCP server. If you are using InCom TCP/IP Bootprom, you will have to use a special trick to specify the boot file name (get more info from InCom WWW site). If you are using a PXE Bootrom, you will need a Proxy DHCP server, but no other trick is needed as the boot file name will be provided by the Proxy DHCP server.
On Linux, the best choice is the standard DHCP server from the Internet Software Consortium. If you are using a PXE Bootrom, in addition to the usual options, you will need to add the following ones:
option dhcp-class-identifier "PXEClient"option vendor-encapsulated-options ff;On Solaris, you can either use the Internet Software Consortium DHCP server (available on the Web), or use Solaris DHCP server (available since Solaris 2.5). However, as Solaris DHCP server does not seems to be able to insert a client class identifier in its DHCP offer, you must install a Proxy DHCP server. Morever, this Proxy DHCP server must reside on another computer since Solaris DHCP server locks the DHCP port.
We suggest giving infinite lease time for remote-boot clients. Don't forget that BOOTP/DHCP requests are bounded by subnets. If the client and the server do not reside on the same subnet, you should install a BOOTP/DHCP Relay agent on any computer between the two. For now, just assume that both machines are on the same subnet.
The role of the Proxy DHCP server is to overcome limitions of some DHCP servers and to provide PXE specific extensions. A proxy DHCP server only makes sense for a PXE Boot rom.
As BpBatch itself is quite powerfull, you wont need to use any PXE specific DHCP extension (menus, etc.). However, if your DHCP server is not able to show minimal PXE compliance, you will need a Proxy DHCP server or your PXE Boot ROM will not accept to go further.
On Windows NT, you can try to use Intel WfM PDK (available from their web site), but it is not very easy to use. We rather suggest having a Linux machine on the subnet and using our small Proxy DHCP. The major advantage of our Proxy DHCP Server for BpBatch is that our server will let you specify an option 155 vendor tag that will be interpreted by BpBatch as a command line.
On Linux and Solaris, you can run our Proxy DHCP program, that simply
takes as argument the TFTP server IP address, boot file name and
optional arguments, and does everything for you.
If the DHCP port on the server is already requested by another daemon,
the proxy DHCP server will run on port 4011. In this case, it is
necessary that the other daemon on DHCP port answer a DHCP offer with
client class PXEClient so that the PXE client knows that it must
try on port 4011.
If you want to understand better PXE extensions to DHCP, there is an extensive description available on Intel WWW site. However, be warned that the documents are quite confusing, as the protocol has been extended to a number of optional stages, in order to allow for a maximal flexibility. The key to understand it is that all what a PXE client needs is a complete enhanced DHCP answer. If it receives only a standard DHCP offer, it will look further until it gets
PXEClientff)
The TFTP server is a very simple file server. In its basic version, TFTP use 512 bytes data blocks, which are quite inefficients. InCom TCP/IP Bootprom and PXE Boot ROMs allow to use larger blocks (1408 bytes), which speeds up transfers a lot. However, this can only work with an enhanced TFTP server.
On Windows NT, we suggest using InCom enhanced TFTP server, available on their web site.
On Linux, you can use our enhanced TFTP server, available at
http://cuiwww.unige.ch/info/pc/remote-boot/soft/etftpd.tar.gz.
On Solaris, you should use InCom enhanced TFTP serer, available on the utility disk provided with the TCP/IP Bootprom.
If you prefer using a standard TFTP daemon, remove
the P in all boot image name extensions, in order to tell the
Bootprom to use only the standard TFTP port (This trick was introduced
by InCom GmbH for the TCP/IP Bootprom. We still use it as an easy way
to select the default TFTP port with PXE bootproms).
First, we will do set up the part common to all operating systems, ie. the batch-file interpreter. Then, for each operating system, we will go through the following steps:
Our examples assume that you have a hard disk of 1.4 Gb or more. If you have less, reduce the sizes of the partitions, but remember the you need to leave a few hundreds megabytes unallocated (that is, the last partition must not take up to the last cylinder) to leave free room for the special cache partition. Moreover, as the cache always starts at the cylinder following the last allocated cylinder, if you do not use the same total size for all your tests, you will have to download several times the same files (the cache will be automatically cleared).
Never despair. If you can't get it to work, first look in the
Troubleshooting section if your problem is not already solved
(get the latest version from the Web).
Then, take a look in the BpBatch forum. Perhaps someone else had the
same troubles as you have, and the answer can be found in the forum.
Forum's URL :
http://cuiwww.unige.ch/info/pc/remote-boot/forum/.
If it still does not work, think about monitoring network traffic
for network related problems (use tcpdump on Linux or
snoop on Solaris). If you really cannot get it to work,
you can send an E-mail to [email protected] or
[email protected].
If your problem is strictly related with the remote-boot configuration
and if we are not overflowed, we will try to solve your problem.
Get the BpBatch software, either as .zip or as .tar.gz.
The executables are available at
http://cuiwww.unige.ch/info/pc/remote-boot/soft/bpb-exe.zip
http://cuiwww.unige.ch/info/pc/remote-boot/soft/bpb-exe.tar.gzIn the server /tftpboot directory, put the following three special
boot images, which together make our pre-boot batch file interpreter:
bpbatch.P, the dynamic loader (respect the uppercase !)bpbatch.ovl, the relocated interpreterbpbatch.hlp, the on-line help file"bpbatch.P". Define a vendor option tag 155
(decimal) with the value "-i"
(on the standard DHCP server, this is done by the following
command: option option-155 "-i";). It is interpreted by bpbatch
as the command line, and -i stands for "interactive".
Boot the client computer. You might shortly see
DHCP while the client waits for a DHCP replyTFTP while the client waits for the first TFTP packetLoading BpBatch while the loader download the
interpreterhelp.
Note that you can run the same interpreter within DOS and Linux by
running the MrBatch program. There are a only very few differences
(the Linux version do not have graphics support and the DOS version
can only send BOOTP and TFTP requests if the BootProm is not hidden
by the operating system).
It may be a good idea to read now the section about the
Syntax Rules of BpBatch, and in particular the paragraphs
on File References and on The Cache Filesystem.
This will help you understand the examples.
Once all operating systems will be set up, you will have to make a menu to let the user choose the one he wants. You should be able to discover by yourself how to make such a menu. All necessary commands are documented at the end of this document.
Try to type LogVars. You should get about thirty variables
listed. Roughly, the first are BpBatch settings, then come
all parameters extracted from the BOOTP/DHCP reply, and the last
variable is a list of disks sizes, in Megabytes.
Type GetPartitions part, then LogVars again. There should be
one more variable containing the list of defined partitions on your
first hard-drive. Assuming that the first partition is either
BIGDOS, FAT32 or LINUX-EXT2, try LogDir "{:1}" to get the
content of the root directory, then LogDir "{:1}/usr" if
there is an usr directory. You can even try
LogTree "{:1}/etc" to get a directory tree.
Put a GIF file (format GIF-87a, interlaced or not, but NOT GIF-89a)
on your TFTP server. We will suppose that the file is named image.gif.
You can copy it wherever you want with the following command:
Copy "image.gif" "{:1}/temp/image.gif". Or you can use it
directly from the server. Now type Logvars "V*" and look at
the value of the VESA variable. If it is On, which is most
probable, that means you have a VESA-compliant video adapter. You can list
the available video modes using Echo "$VESA-Modes". To display your
image try the following command: DrawGif "image.gif".
The image should be on the upper
left corner of the screen. You can draw it on another place by specifying
X and Y coordinates after the image name. You can also draw text
with DrawText 200 200 "Hello world" yellow. Or draw an empty
window with DrawWindow 200 200 300 150. To insert a title when you
create a new window, try DrawWindow 200 200 300 150 "My Window".
When you are tired of graphic mode, simply type CloseGraph.
Note on graphics : by default, all graphical routines work in the 800x600
VESA mode (with 256 colors), which is the first field of the VESA-Modes
variable. If you want to use a different video mode, change the variable in
order to have the requested video mode as the first field of the list.
Now take a text editor, and create a file named test.bpb
in the tftpboot directory with the following content:
:again
DrawWindow 150 200 400 160 "Identity check"
TextAttr Black LightGray
At 15,20 Print "Username : "
Input username 8
At 17,20 Print "Password : "
Getpasswd userpass 8
if "$username" != "smith" goto again
if not "$userpass" match-passwd "BpR8oiIlRR9bo" goto again
#
clear
DrawWindow 200 200 150 100 green blue "Congratulations"
DrawText 220 250 "You got it !" yellow
WaitForKey 3
CloseGraph
interact
"-i"
to "test", and reboot the client computer. The small script
should run automatically, and ask you for a username and password.
If you do not type smith and justdoit, you wont be able to
boot the computer. Later you will learn how to use a Unix, NT or Radius
server to check valid user names.
In order to set up Linux, you will need to boot the floppy disk
provided with the RedHat Linux distribution. BpBatch includes a
command that can redirect the boot to the floppy: FloppyBoot.
Set up RedHat Linux on your client, with network support, and any packages you may want. You may want to recompile the kernel to better fit your hardware, but it is not necessary.
It is probably a good idea to include BOOTP support to the kernel, so that you do not have to customize the client IP address manually.
In order to reduce network load, you might also want to setup the
filecache for caching on the hard disk files that are
loaded by NFS.
Roughly, the principle of the filecache
is that whenever a symbolic link from the cache subdirectory
is followed, it is replaced by its target. If the target is itself a
subdirectory, each entry of the subdirectory becomes a symbolic link
to the original entry of the foreign filesystem.
The filecache has been written by Unifix GmbH, and is part of
Unifix Linux 2.0. It is freely distributable, and you can get the
necessary files from
http://cuiwww.unige.ch/info/pc/remote-boot/soft/filecache.tar.gz.
In order to use the filecache, you have to
patch-filecache),
enable filecache support through make config or whatever
you prefer, and recompile the kernel/sbin/mnt/nfs (using mkdir)filecache.conf to /etc. This file contains
the following lines:
Max 100 MB 50 % # Cache /mnt/nfs/usr /usr Cache /mnt/nfs/opt /opt
/usr and /opt to the server,
export them read-only
with anon=0 (for allowing root access) and mount them under
/mnt/nfs (add a line for that in /etc/fstab)/usr as /usr.orig/usr to /mnt/nfs/usr/opt as /opt.orig/opt to /mnt/nfs/opt/usr and /opt are not empty and contains
the correct directories/usr.orig and /opt.origfilecache.init to /etc/rc.d/init.d/etc/rc.d/rc3.d/S35filecache to /etc/rc.d/init.d/filecache.init
Copy your compressed kernel image (zImage, bzImage, vmlinuz
or whatever you call it) to the
server /tftpboot directory as linux.krn. If you had to unplug
the bootprom from the PC, you can now plug it again. When BpBatch
starts, type LinuxBoot "linux.krn" "root=/dev/hda1 BOOT_IMAGE=linux"
(assuming
that the root ext2 filesystem is on the first partition). Alternatively,
if you did setup your configuration on a computer without bootprom,
just boot let it boot using the loader you installed (lilo, ...). But
in the later case, if you want the filecache to work, you should have
explicitely installed your kernel with filecache support at the right place.
Wait until the system comes up.
If you installed the filecache, you can check that /usr has
exploded into a directory with some symlinks and some already-exploded
directories. Now start the programs that the end-users will use most of
the time, in order to load them once for all to the hard disk.
You can still make adjustements to your configuration, like on any stand-alone linux station.
When you are happy with your configuration, login as root,
go to the /tmp directory and
run our mrzip program.
MrZip is a command interpreter like BpBatch, but it can
understand more commands than BpBatch does. In particular, it
can understand the following commands:
showlog
filter -"tmp/*"
filter -"var/log/*"
fullzip "/" "/tmp/linux.imz"
/tmp/linux.imz. Move it to
the server /tftpboot directory. Then copy the following
batch file to /tftpboot/linux.bpb:
hidelog
setpartitions "linux-ext2:992 linux-swap:32"
fullunzip "linux.imz" 1
clean 2
linuxboot "linux.krn" "root=/dev/hda1 BOOT_IMAGE=linux"
The BOOT_IMAGE argument is to stay compatible with lilo for
RedHat 5.1 and later rc.sysinit.
Your remote-boot linux configuration is ready ! You can now either
set the BOOTP-option-155 to "linux", or type include "linux.bpb"
from within BpBatch to test it.
If you want later to upgrade software, install bug fixes and security fixes, proceed as follow:
On the client computer, boot on your favorite dos floppy disk (either
remove the bootprom or type FloppyBoot within BpBatch).
Format the dos partition of your hard-drive with the /S
option, in order to put the operating system on it.
The size of the partition is not important, as disk archives created
with MrZip
Create a DOS subdirectory, copy DOS in it. Install your
favorite network client (for instance Microsoft LanManager),
Windows 3.1, and so on. If you use Microsoft LanManager,
do not use DHCP for the IP configuration as it is a very poor
implementation that will almost surely fail with reasonable
network load. To do that, add the following lines in your protocol.ref
file, in the section that loads tcptsr (of course, replaces the xxx
by your true IP parameters):
IPADDRESS0 = xxx xxx xxx xxx
SUBNETMASK0 = 255 255 xxx xxx
DEFAULTGATEWAY0 = xxx xxx xxx xxx
DISABLEDHCP = 1
Do not be afraid to use EMM386 to optimize the memory usage, and
even to include the area where you put your network adapter ROM,
since it is not used anymore at this time. But carefully exclude
the network adapter RAM, or you will not be able to connect to your
server. Use the NOEMS parameter.
If you want to ensure that the client machine cannot be used without
a valid login name, download our nobreak
pseudo-device driver (available at
http://cuiwww.unige.ch/info/pc/remote-boot/soft/nobreak.zip)
and run it at the beginning of your
config.sys. Then add something like this to your autoexec.bat:
rem -- we use the dummy file c:\logged as a flag
del c:\logged >nul
:loginneeded
cls
echo Please type in your login name and password
echo.
net logon *
rem -- the login script should have created c:\logged
if not exist c:\logged goto loginneeded
del c:\logged
rem -- now enable break again
echo Yes >NOBRK
Ensure that your client boot well
by rebooting the client and evaluating the following commands
within BpBatch interactive mode:
HideBootprom
HdBoot
On the server, make a share called admin for instance, on
which you will put some stuff for the system administrator.
If the server is a Unix machine, it is a good opportunity to put
in admin a softlink to the /tftpboot subdirectory,
so that you can put images in it directly from the client.
Within admin, create a /utils subdirectory
and put the following files in it:
mrbatch.exe,
the DOS version of BpBatchmrzip.exe,
the DOS version of the program for building disk imagesbpbatch.hlp,
the on-line help filezipdos.mrz
file that contains the commands needed for building a DOS image, like this
one:
showlog
filter -"lanman.dos/lmuser.ini"
filter -"temp/*"
filter -"*.swp"
fullzip "c:/" "L:/tftpboot/dos.imz"
Now go back to your client, mount the admin volume on drive
L:, go to your utils directory and type the following command:
mrzip -b zipdos
One minute later, you will have a new file in the server
/tftpboot subdirectory called dos.imz, which is a
compressed image of your hard disk. Copy the following
batch file to /tftpboot/dos.bpb:
hidelog
setpartitions "bigdos:1024"
setbootpart 1
fullunzip "dos.imz" 1
hidebootprom
hdboot :1
Your remote-boot DOS configuration is ready ! You can now either
set the BOOTP-option-155 to "dos", or type include "dos.bpb"
from within BpBatch to test it.
If you want to customize some settings according to the machine,
typically the IP settings since Micro$oft DHCP is buggy,
you can setup BpBatch to change some files before booting.
Firsti go to the lanman.dos directory and do
copy *.ini *.ref
Then edit the .ref files and replace all fixed parameters with
BOOTP variable names as in the following examples:
computername = ${BOOTP-Host-Name}
ipaddress0 = ${MS-IPAddress}
subnetmask0 = ${MS-IPSubnet}
defaultgateway = ${MS-IPRouter}
Then rebuild the disk image as previously.
Note that for IP parameters, we do not use the BOOTP variables directly
because LanManager needs then as space-separated numbers instead of
dot-separated numbers. Change dos.bpb to the following:
hidelog
setpartitions "bigdos:1024"
setbootpart 1
fullunzip "dos.imz" 1
set MS-IPAddress="$BOOTP-Your-IP"/.= /
set MS-IPSubnet="$BOOTP-Subnet-Mask"/.= /
set MS-IPRouter="$BOOTP-Routers"/.= /
patch "{:1}lanman.dos/protocol.ref" "{:1}lanman.dos/protocol.ini"
patch "{:1}lanman.dos/tcpputils.ref" "{:1}lanman.dos/tcputils.ini"
patch "{:1}lanman.dos/lanman.ref" "{:1}lanman.dos/lanman.ini"
hidebootprom
hdboot :1
.ref files in the server
/tftpboot directory instead of in the disk image.
We like to be able to easily change the computers configuration
without rebuilding the image. To do that, copy your autoexec.bat
and config.sys as autoexec.ref and config.ref to the
server /tftpboot
and add the following two lines to the batch file above:
patch "autoexec.ref" "{:1}autoexec.bat"
patch "config.ref" "{:1}config.sys"
You can then freely change the files and even customize them
with machine-dependant values obtained from BOOTP.
After making any change to the client machine configuration,
do not forget to rebuild the disk image using mrzip
if you want to preserve your changes.
If you want later to add new software or change anything else, proceed as follow:
In previous versions of this document, we used the Microsoft server-based installation of Windows 95, but it was really too much pain and not much worth:
Setup a regular Windows 95 client, either starting from scratch as explained in the configuration of a DOS client, starting from the DOS client and installing over the network (that is what we did). You can also start with a preconfigured Windows machine, but you will probably have less knowledge of what stuff is on the hard disk.
Proceed as described above for a DOS client. It is usually NOT necessary
to use EMM386 with Windows 95.
If you are using Windows 95 OSR2 (alias MSWIN 4.1, alias Windows 95
service pack 1, alias Windows 95 with Internet Explorer), you should
add the following line in the [Options] section of
MSDOS.SYS (yes, it is a text file):
AUTOSCAN=0
If you want to reduce network and server load (which will improve your system performances) while keeping all softwares on the server, you should consider installing the excellent Shared LAN Cache, from Measurement Techniques, Inc (see http://www.lancache.com). This software runs on each client computer, and caches to the local hard disk every data obtained from the network. Even MS-Office starts much faster the second time you run it... You need one license per client computer, but it is not very expensive, and the firm make special prices for universities and colleges. The best thing to do is to go to their Web site and download the free evaluation copy.
Your MrZip script will be named zipwin95.mrz and contain:
showlog
filter -"temp/*"
filter -"*.swp"
fullzip "c:/" "L:/tftpboot/win95.imz"
To build the image, mount the admin volume on drive
L:, go to your utils directory and type the following command:
mrzip -b zipwin95
A few minutes later, you will have a new file if the server
/tftpboot subdirectory called win95.imz, which is a
compressed image of your hard disk. If your compressed image was bigger
than 87 MB, it has probably been splitted in two or more fragments.
These fragments will automatically loaded one after the other when
needed. Note that an image bigger than 87 MB will usually take
More than one minute to uncompress and may irritate your users.
Our Windows 95 image is only 70 MB big, because most software (except
Office and Explorer) completely reside on the server. Only 45 seconds
are needed to uncompress the image and restore the full disk.
Copy the following batch file to /tftpboot/win95.bpb:
hidelog
setpartitions "bigdos:1024"
setbootpart 1
fullunzip "win95.imz" 1
hidebootprom
hdboot :1
Your remote-boot Windows 95 configuration is ready ! You can now either
set the BOOTP-option-155 to "win95", or type include "win95.bpb"
from within BpBatch to test it.
The big difference between Windows 3.1 and Windows 95 is that the later includes code for Plug-and-play , ie. automatic detection of your hardware. This not a bad thing in itself, but the trouble is that it is often too sensible, and that it sometimes fails.
If you try to start another client with exactly the same boot image, you will probably get several messages during startup telling that Windows has detected new hardware: a new sound card, a new hard-disk, a new network card, and even a new mouse... There can be two reasons for that:
The thing you cannot avoid to differ between computers is the network card. PCI cards usually do not mind, but ISA Plug and Play do. Bad luck for us, the plug-and-play code for our SMC EtherEZ card hangs the computer. The only solution is to let Windows 95 believe that it already know the network card, and that it is not necessary to trigger plug-and-play. The trick for doing that is to automatically insert an entry for the network card in Windows 95 registery, before starting it. Note that this trick is not any more needed with most PCI cards.
Move the autoexec.bat to the server as described above for DOS.
Edit it (on the server) and add the following lines:
rem --- Patch Windows registery in order to avoid plug-and-play detection regedit /L:c:\windows\system.dat /R:c:\windows\user.dat c:\temp\patch.reg
regedit is a standard Windows 95 program that let you browse
the registery if you start it from within Windows 95, or do simple
operations on the registery if you call it from DOS.
Run regedit under Windows 95, search for your network card,
usually under
HKEY_LOCAL_MACHINE\Enum\ISAPNP
and export the branch using the File menu. This will create a text
file, that you should same as patch.ref in the server /tftpboot
diretory. Edit this file and find out where the card ethernet address
is stored (do that on two different machines and compare the files
if you can't find it by yourself). Replace it by a pettern in the
form ${MACID}.
Then add lines to the win95.bpb script like this:
set macid = "$BOOTP-Client-ID"
patch "patch.ref" "{:1}temp/patch.reg"
(do any necessary string manipulation for setting MACID if it is
not exactly the client Ethernet address).
That's all, your clients should not any more try to autodect the network
card.
Once again, this whole trick is not necessary when using PCI network
adapters.
Incidentally, we can use the same mechanism for automatically
configuring the hostname, which Windows 95 does not seem to take
into account when configuring through DHCP. We just add the
following line to our patch.ref file:
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\VNETSUP]
"ComputerName"="${BOOTP-Host-Name}"
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\VxD\MSTCP]
"HostName"="${BOOTP-Host-Name}"
[HKEY_LOCAL_MACHINE\System\CurrentControlSet\control\ComputerName\ComputerName]
"ComputerName"="${BOOTP-Host-Name}"
Using this small registery trick, your configuration should normally be portable for all machines with similar configurations. If you cannot avoid that Windows detect some hardware as new on one machine, try to rebuild the disk image from this machine. This will include the registery configuration specific to this machine into the image, and hopefully supress the problem.
If you want later to upgrade software, install bug fixes and security fixes, proceed as follow:
We do not use Windows NT for remote-boot client computers but we have tested our system to ensure that it work as well. And it works.
As our utilities currently have no support for NTFS (we neither have the documentation nor the time to do that, but I would be happy to help anyone who is interested in doing it), you will have to install NT on FAT16 (simply do not convert your partitions to NTFS during the setup).
Copy your win95.bpb boot script to winnt.bpb.
Change the setpartitions line in winnt.bpb to the following:
setpartitions "BIGDOS:512 BIGDOS:512"
Then boot Windows 95 using this script, and install
your NT client on drive C. Do not worry about the second partition for now.
Do not install too much stuff, or you will
get a really large and slow-to-uncompress image.
Remove Windows 95 from the disk disk C, you do not need it
in a Windows NT image (the boot menu is handled by the bootprom,
not by NT boot loader).
Reboot your computer in without overwriting the hard disk, ie. do not
execute the winnt script but just
hidebootprom
hdboot
Your NT station should start-up correctly. Make any
necessary customization.
The trouble with Windows NT is that direct disk access is prohibed
by the kernel. That means, MrZip will not even be able to read the
boot sectors. The best way to do an image is then to boot Windows 95
and to run MrZip from a DOS window. To do that, change the
winnt.bpb script so that the Windows 95 image is not restored
on the first but on the second partition:
hidelog
setpartitions "BIGDOS:512 BIGDOS:512"
setbootpart 2
fullunzip "win95.imz" 2
hidebootprom
hdboot :2
"{:1}" to
"{:2}"). Boot with this script; you should have Windows
95 running, but a new drive D: should be available, with
Windows NT inside.
Make your disk image as usual (but on D:, of course), and
save it as winnt.imz on the server /tftpboot directory.
Edit one last time the winnt.bpb script like this:
hidelog
setpartitions "BIGDOS:512 BIGDOS:512"
setbootpart 1
fullunzip "winnt.imz" 1
clean 2
#fullunzip "win95.imz" 2
hidebootprom
hdboot :1
If you want later to upgrade software, install bug fixes and security fixes, proceed as follow:
winnt.bpb: comment the clean and winnt fullunzip,
uncomment win95 fullunzip
This section lists most frequently encountered problems.
You are probably using a standard TFTP server, and it cannot handle more than 65535 packets of 512 bytes (or even 32767 packets for the Solaris server). That is, your image must be fragmented in pieces of no more than 30 MB (or 15 MB for Solaris). See under CopyArchive for instructions on fragmenting an existing image. But you should seriously thing about using InCom's extended TFTP server, as it is much more efficient (it uses packets of 1408 bytes instead of 512 bytes).
There are three possibilities. Either the image is really corrupted on the server (try use MrZip to see if it is the case), or the file transfer has failed because of TFTP timeout, or because of incompatible protocol.
TFTP timeout occurs when the network
is too heavily loaded (for instance if you try to download a huge image
with more than four clients at a time). In this case, BpBatch
does not retry indefinitely because it would not help. Shut down
a few computers and retry with no more than four computers (or maybe
even three).
If you often need to download images for a lot of computers, you can
try our special Broadcast TFTP server (see the section dedicated to it).
Incompatible protocol is caused by using a standard TFTP server (typically the one built-in in your UNIX server) while asking BpBatch to work with enhanced TFTP. If you use a standard TFTP server, you should remove the .P extension (see the explanation in the next question).
If you are using Incom's TFTP server, try to add -s 1408 59 to the command
line. If you are not using an enhanced TFTP server, remove the .P
extension from BpBatch filename on the server and in bootptab.
Detailed explanation :
this problem occurs if you did not setup an extended TFTP server but
you used bpbatch.P as the bootfilename DHCP/BOOTP tag. BpBatch will
indeed try to connect to an extended TFTP server when the bootfilename
ends with
a .P extension. To solve this problem, you can either remove the .P
extension at the end of the bootfilename (it will tell BpBatch to use standard
TFTP) or install an extended TFTP server.
The only supported extended TFTP server today is the
one provided by Incom. You can find compiled binaries on their web site, or
on our distribution directory. For Incom's TFTP server to properly work with
the extended TFTP feature, you must add -s 1408 59 to the command line.
May be your computer has a bad VESA support. Try giving the -v
command-line argument or setting the VESA variable to "OFF".
We use a VESA 1.1 function for scrolling. If your video adapter does not support VESA 1.1, forget it. If the scrolling works for one page, but then produces a strange strippled pattern, do not worry. This is a known bug, I will fix it as soon as I have time for it (VESA scrolling is not really essential...)
When a file in the cache is corrupted by an external program,
it is automatically removed from the cache. When a file in the cache
is not fully written (because the computer is turned off during the
file transfer), it is also automatically removed. But if the server
transmits a corrupted file or if the transfer aborts from the server
side, it is possible that this file stays in the cache. You can clean-up
the cache simply by holding both shift down while BpBatch access
it for the first time. Alternatively, you can evaluate clean -1
in interactive mode.
This is not a bug. Exit is not a command. There is no exit or quit command because it does not make any sense to exit from a boot script without booting. And MrBatch is really the same program as BpBatch. What you can do instead is calling HdBoot. This makes sense, and the DOS version will cleanly exit instead of rebooting. Note that you can exit from the DOS version at any time by pressing Ctrl-Break. This will restore all hooked interrupts before leaving.
If you try to print something and immediately enter interactive mode,
you may not see your text. This is because your text was written
on the runtime screen and the Interact command has
switched the display to the Log screen. Just put a GetKey
after the print commands and you will see the text output.
Malloc failedMrZip needs a lot of conventional memory to run.
If you encounter this problem, first ensure that you have unloaded
the bootprom either using HideBootprom or using InCom's bputil.
If you run MrZip from
bare MS-DOS (not within Windows 95 DOS box), you should use EMM386
to load the network drivers high in order to get as much conventional
memory as possible. From a Windows 95 DOS box, there is usually no
problem (as long as you have not left your old 16-bit stuff in
your autoexec.bat when you installed Windows 95).
This bug has already been fixed once. Get the latest release of
MrZip. If the problem persists,
try to build your image with Trace set to "ON" (and usually
PauseLog set to "OFF"); this will let you discover which
file causes the problem. Send a detailled bug report.
MrZip is probably trying to read a locked, open or special file,
such as Windows swap
file. Such files should usually not be included in
the image and should be filtered out (using the filter command).
It is also possible that the operating system is playing you a trick.
If MrZip does not tell you what file causes the problem,
try to build your image with Trace set to "ON" (and usually
PauseLog set to "OFF").
You can also try to use direct
disk access (that is, do not refer the source partition as
"C:" or "/" but as "{:1}" or
whatever partition it is). Using
direct disk access is usually slower because we have less buffers than
the operating system, but it may be sometimes more reliable.
Disk images are stored in the special cache area and should not be reloaded if they have not changed on the server. However, as the cache area always starts after the last used partition, changing the total size of partitions will move the location of the cache and thus destroy its content. Another possible reason for a file disappearing from the cache is that the previous file has grown more than one-and-an-half times its initial size. The file would then have been overwritten and need to be downloaded once again. This should almost never occurs. A third possible reason is a too small cache area. If the free space left outside the partitions is less than one-and-an-half times the sum of all compressed image sizes, only the most recently used images will be present in the cache and the other will have to be reloaded on demand.
This distribution assumes Linux was booted using lilo and checks
for the BOOT_IMAGE command line argument (in
/etc/rc.d/rc.sysinit). Simply add it in the linuxboot
call, or change your rc.sysinit.
Linux dhcp client is a program that dynamically changes the IP address of the client according to DHCP offers. If the address is offered forever (infinite lease time), the DHCP client just set the address and returns (this is what we expect). However, if the lease time is limited, the DHCP client must remain loaded and ask for new addresses every few minutes. And if the DHCP client does not return, MrBatch will never be loaded... The solution is to give an infinite lease time (sometimes encoded as -1).
This problem occured on an AMI BIOS dated 94/07/25. We investigated a little bit, and found no solution. It seems that this problem is due to a bug in this BIOS (some register or memory location must be destroyed).
This problem was introduced with PXE compatibility, but has now been fixed. Please get the latest version.
This problem has been fixed in the 9th of August version of MrBatch/MrZip. There was a problem with a new version of ncurses which has been released with RedHat 5.1.
MrZip has been linked to the version 3.0 of libncurses. You can use other
versions of libncurses only if they are newer than version 3.0. To use a
newer libncurses, all you have to do is to create a soft link from
libncurses.so.3.0 to your libncurses.so.xx file.
With RedHat 5.1, you can use the following command :
cd /usr/lib ; ln -s libncurses.4.2 libncurses.3.0
You can also download a version recent version of mrzip/mrbatch. Starting
from the 10/25/98, mrbatch is now compiled under RedHat 5.1.
This problem is the reverse of the previous one. Now that the distribution is libc6 ready, it cannot be used any more with libc5. If you encounter this problem, simply upgrade your Linux box (Well, if we hear too much complaints, we might try to keep two distributions...).
You should first display the contents of the VESA-Modes variable, to
see if your hardware support the mode you would like to use.
Then, try one of the two ways to select a special VESA mode :
InitGraph "mode": Try InitGraph "1024x768", and then run the
graphical primitive you are interested in (e.g DrawGif).VESA-Modes: The first field of the VESA-Modes variable is
the name of the default mode. If you change the VESA-Modes variable, all
graphical primitive will use the mode you specified.We corrected a bug in the memory allocation functions of BpBatch. You should make sure that you have a version of BpBatch which has been released after september the 22nd 1998.
We corrected this problem in the 09/22/1998 release.
The 10/25/98 release did correct a problem with large images. Try to download a recent version of BpBatch.
This bug has been corrected in the 10/25/98 release.
This bug has been corrected in the 02/09/99 release.
This section provides detailled informations on the use of the tools we developped at the CUI, University of Geneva for this remote-boot configuration.
These three names stand for three variants of the same program, with the following characteristics:
BpBatch is a special program that can be started from the
BootProm before the operating system is loaded. It is made
of two parts: bpbatch.P, the dynamic loader, and
bpbatch.ovl, the program itself. BpBatch has
full disk I/O capabilities through our own implementation
of FAT16, FAT32 and Ext2fs, as well as remote network I/O
capabilities through the BootProm TFTP API.
BpBatch was compiled under DOS using
Borland C 5.0 and Turbo Assembler 3.2.MrBatch is the DOS/Linux version of BpBatch.
All commands recognized by BpBatch are recognized by
MrBatch and vice versa. This is very usefull if you
want to test your batch scripts from a DOS/Linux session.
Under DOS, MrBatch emulates remote I/O by OS-based file
access if the bootprom is not available. Under Linux,
the bootprom cannot be seen anymore but MrBatch
can emulate it using Linux IP support, or use OS-based file
access.
MrBatch was compiled under Linux using GCC 2.7.2.1
and under DOS using Borland C 5.0 and Turbo Assembler 3.2.MrZip is an interpreter that recognizes a superset of
MrBatch language, and that serves to build disk images.
In MrZip, the limited remote file I/O is replaced by a
full-featured OS-based file access. MrZip does not
include VESA support.
MrZip was compiled under Linux using GCC 2.7.2.1
and under DOS using Borland C 5.0 and Turbo Assembler 3.2.
All programs accept the same syntax of arguments. MrBatch and
MrZip take them from the command line, while BpBatch
look for them in the BOOTP option 155 (decimal). Here is the
syntax of the arguments:
[-x] [-l] [-b] [-v] [-w] [-i] [script-basename]
where:
-x disable the use of extended memory-l disable the use of ISO-latin-8859-1 as default character
set-b cancel the bootprom detection (which cause a floppy
seek under DOS)-v cancel the VESA detection (which cause a switch to full
screen under Windows 95)-w enable direct disk write access (disabled by default
under DOS and Linux)-i enable interactive mode even if a script name is providedscript-basename is optional. If provided, MrBatch and
BpBatch load the file with the .bpb extension, and MrZip
loads the file with the .mrz extension. If not provided,
MrBatch and MrZip run in interactive mode while BpBatch
loads the file with the same basename as the BOOTP Boot file and
a .bpb extension.
The following rules apply when BpBatch parses an input line.
\a is substituted by the audible-bell character (ASCII 7)\b is substituted by the backspace character (ASCII 8)\n is substituted by the newline character (ASCII 10)\r is substituted by the return character (ASCII 13)\t is substituted by the tabulation character (ASCII 9)\v is substituted by the vertical-tab character (ASCII ...)\nnn where n is a 3-digit octal number between 000 and 377
is substituted by the character with ascii code specified\X where X is any other character not listed above
is substituted by X itself. In particular,
\" is substituted by a regular double-quote (not a string-delimiter)\$ is substituted by a regular dollar sign (not variable substitution)\\ is substituted by a regular backslash (not a special character)Empty lines are ignored.
Lines starting with a sharp (#) are treated as comments and are
not interpreted.
Lines starting with a column (:) are treated as labels and are
not interpreted.
Strings are delimited by opening and closing double-quotes:
"Hello world"
To include double-quotes within a string, quote them using a backslash:
"I said: \"Hello world\""
Strings can be postfixed with a few operators.
"Hello world"/o=u/ == "Hellu wurld"
"198.76.54.32"/.= / == "198 76 54 32"
"Hello world"{0} == "Hello"
"198 76 54 32"{1-3} == "76 54 32"
"Hello world"[4] == "o"
"Hello world"[4-7] == "o wo"
Numerical expressions work on 32-bits integer numbers (from -2,147,483,646 to 2,147,483,647). Hexadecimal octal and binary numbers are not understood. Whenever a numerical expression is expected, the following are recognized:
% (modulo)
and expr is a numerical expression.
Note that EACH operation MUST be enclosed between parenthesis :
((3 * 5)+2) == 17
@"Hello world" == 11
#"Hello world" == 2
A few commands expect durations as arguments. Durations are measured in seconds, with a precision of up to a tenth of second:
Delay 3 waits for 3 seconds
Delay 0.3 waits for 3/10 seconds
Whenever a color is expected, you can either use the numeric value of the color or its symbolic name (case-insensitive). The following colors are recognized
Black 0
Blue 1
Green 2
Cyan 3
Red 4
Magenta 5
Brown 6
LightGray 7
DarkGray 8
LightBlue 9
LightGreen 10
LightCyan 11
LightRed 12
LightMagenta 13
Yellow 14
White 15
File names are strings. They must therefore always be enclosed between double-quotes. File names are case-sensitive on case-sensitive filesystems, case-insensitive on case-insensitive filesystems. Slash and backslash can be freely used one in place of the other. Do not forget to double backslash since a single backslash is an escape character.
There are two kinds of file references:
Direct disk files are referenced using the following notation:
"{disk:partition}/absolute/filename"
The disk number can be omitted and defaults to zero.
For instance, "{:1}/usr/bin" points to /usr/bin
assuming there is
such a directory on the first partition. Direct file I/O is
solely based on our own file access routines (we do not use the
operating system).
There are two special partitions. Partition zero corresponds to the hard disk master boot record (MBR) and has a pseudo file-system which let you access the boot code. Partition minus-one (-1) corresponds to the cache filesystem (see below).
Under BpBatch/MrBatch, foreign files correspond to remote files on the TFTP server when the BootProm is available:
"help.bpb" is the file help.bpb in the /tftpboot directory
"gifs/MyImage.gif" is a file in /tftpboot/gifs
Other TFTP servers can be referenced :
"198.76.54.32:help.bpb"
If the other server is behind a gateway :
"198.70.0.1/198.76.54.31:help.bpb"
One can also specify a specific port for the TFTP connection :
"198.76.54.32@89:getpasswd/smith"
There can be only one open remote file at a time.
If the BootProm is not available, remote files are emulated using
the operating system file I/O, but the same restriction apply.
Under MrZip, foreign files correspond to files as seen by the operating system. There is no limitation, and foreign files can be used wherever direct disk files can be. Foreign files are usually faster than direct disk files, because the operating system has more buffers. Foreign files can refer to network files if supported by the operating system.
"C:\\autoexec.bat"
"C:/config.sys"
"/mnt/net/usr"
In order to reduce network load and to fasten the boot process, disk archives, linux kernels and possibly other files are cached on the hard disk. This disk cache is located at the end of the hard disk, between the last cylinder allocated in the partition table and the last physical cylinder of the disk (out of any allocated partition). There MUST be room between the last partition and the end of the disk if you want the cache filesystem to work. The cache filesystem MUST work if you want to restore a disk image.
The disk cache is organised in a volatile, CRC-validated filesystem : Each directory entry and each 32 KB data block is validated by a 32-bits CRC. Whenever a directory entry or a data block unexpectedly changes, the file is automatically removed from the cache and downloaded again upon the next request.
You can freely access the cache filesystem from within BpBatch, MrBatch
and MrZip using direct disk access on the special partition
"{:-1}".
To see the content of the cache, just type :
logdir "{:-1}"
If the cache ever gets corrupted and is not automatically cleaned (which
should never occurs), you can either type :
clean -1
(in interactive mode) or hold both shifts down when BpBatch access
the cache for the first time.
Some variable are initially set and/or have special meanings. Some of them exist within all programs, other are only available under MrZip and other are only available when a BOOTP/DHCP reply has been received.
$Program is set to "BpBatch" within BpBatch, "MrBatch" within
MrBatch and "MrZip" within MrZip$Basename is set to the basename of the script on which the
batch interpreter was started$HelpFile is the name of the file loaded when
Help is invoked.
Default: "${Basename}.hlp"$BOOTP-... are variables set from the BOOTP/DHCP reply (see the
paragraph on BOOTP/DHCP variables for more details)$DHCP-... are variables set from the DHCP reply (see the
paragraph on BOOTP/DHCP variables for more details)$Disks is set to the space-separated list of sizes for each disk.
That means, #"$Disks" represent the number of disks
and "$Disks"{0} is the size of the first disk$Keypressed is set to the next ready-to-read key available in the
keyboard buffer (if available)$LBA controls the use of LBA to access disks > 2Gb.
Default: "ON"$FDA controls the use of fast disk access (write accross cylinders).
Default: "ON"$VESA controls the use of VESA graphics.
Default: "ON" if available$VESA-Modes gives the list of all available VESA modes.
The first entry of the list is the default mode, which is used
when no parameter is given to InitGraph.
Note: if VESA="OFF", this variable is blank$APM is set to "ON" if your computer supports Avanced Power
Management. If $APM is "ON", you can use the command PowerOff
to turn your computer off.
Default: depends on your hardware$Trace controls the display of each command before execution. It also controls the display of file names when creating new archives.
Default: "OFF"$AutoShowLog controls the automatic switch to the text log whenever
the ESC key is pressed.
Default: "ON"$PauseLog controls the pause between each page of log when the log
is visible.
Default: "ON"$CacheDisk is set to the disk used for caching remote files.
Default: empty == 0, the first hard disk$CacheAlways controls the automatic caching of remote files copied,
patched or drawn as GIF.
Default: "OFF"$CacheNever prevents any file from being cached.
Turn this variable on for diskless Linux boot.
Default: "OFF"$CacheReserve controls the preventive allocation
of 25 percent more space than necessary in the cache partition,
to let the files grow. Turn this variable off if you are short
of disk space.
Default: "ON"$ExtMemory controls the use of Extended Memory (or XMS).
Once deactivated, extended memory cannot be reactivated.
Default: "ON" if available$IsoLatin controls the interpretation of upper ASCII codes in
included and patched files. The IsoLatin settings are
processed at the time the file is loaded, not at the
time the file is processed.
Default: "ON"$ProgressX and $ProgressY controls the position of the progress
window displayed in VESA graphics during archive download
and decompression.
Default: 200 200$EXT2-Backup controls the update of superblock backups in Linux
ext2 filesystem. Superblock backups take a few seconds to
do and are never used by current kernels (only by e2fsck).$Security-Gateway controls the gateway-server used for user
authentication. Our special authentication gateway must be running
on the target computer.
Default: "${BOOTP-Server-IP}@89"
(ie. the TFTP server, on port 89)$Security-Check contains the answer of the security server for the last
check performed, either PASSED or FAILED.
Default: "FAILED"$Security-Passwd, $HelpTopic, $OnExit, $OnKey-...
are used internally.See also BOOTP variables and MrZip-specific variables.
The following variables are only used within MrZip.
$TempPath controls the directory where temporary files will be stored.
Default: <empty> == current directory$DumpFormat controls the way archives are dumped to the log when requested.
It is a string containing
$FragmentSize controls the size of archive pieces.
If you do not use InCom's extended TFTP server, you should
set this to "30 MB".
Default: "87 MB"$SourceArchive, $DestArchive, $Filter... are used internally.
The following BOOTP-... and DHCP-... variables are recognized, as long as a BOOTP/DHCP reply has been received (TCP/IP Bootprom must be reported as detected):
$BOOTP-Client-ID
$BOOTP-Your-IP
$BOOTP-Server-IP
$BOOTP-Gateway-IP
$BOOTP-Bootfile
$BOOTP-Server-Name
$BOOTP-Subnet-Mask
$BOOTP-Time-Offset
$BOOTP-Routers
$BOOTP-Time-Servers
$BOOTP-Name-Servers
$BOOTP-Domain-name-Servers
$BOOTP-BOOTP-Log-Servers
$BOOTP-Cookie-Servers
$BOOTP-Lpr-Servers
$BOOTP-Impress-Servers
$BOOTP-Resource-Location-Servers
$BOOTP-Host-Name
$BOOTP-Boot-Size
$BOOTP-Merit-Dump
$BOOTP-Domain-Name
$BOOTP-Swap-Servers
$BOOTP-Root-Path
$BOOTP-Extensions-Path
$BOOTP-IP-Forwarding
$BOOTP-Interface-MTU
$BOOTP-All-Subnets-Are-Local
$BOOTP-Broadcast-Address
$BOOTP-NIS-Domain
$BOOTP-NIS-Servers
$BOOTP-NTP-Servers
$BOOTP-Font-Servers
$BOOTP-X-Display-Manager
$DHCP-IP-Address-Lease-Time
$DHCP-Message-Type
$DHCP-Server-Identifier
$DHCP-Message
$DHCP-Renewal-Time
$DHCP-Rebinding-Time
$BOOTP-NIS+-Domain
$BOOTP-NIS+-Servers
$BOOTP-Server-Name
$BOOTP-Bootfile
$BOOTP-Mobile-IP-Agent
$BOOTP-SMTP-Servers
$BOOTP-POP3-Servers
$BOOTP-NNTP-Servers
$BOOTP-WWW-Servers
$BOOTP-Finger-Servers
$BOOTP-IRC-Servers
$BOOTP-StreetTalk-Servers
$BOOTP-STDA-Servers
Other BOOTP/DHCP parameters can be used under the name
$BOOTP-Option-n
where n is the decimal representation of the BOOTP option number.
Do not mix-up BOOTP-Gateway-IP, which is the gateway to use for TFTP
and should be 0.0.0.0 if the TFTP server is in the same subnet, and
BOOTP-Routers, which contains the default IP gateway(s). The
TCP/IP Bootprom sometimes seems to set the value of BOOTP-Gateway-IP
from the value in BOOTP-Routers, causing each TFTP ack packet to
be sent to the router first. To avoid such behaviour, if your TFTP server
is in the same subnet as the client, force BOOTP-Gateway-IP to
0.0.0.0 (thanks to Maciek Uhlig for having pointed out this problem).
This section lists commands for monitoring the system state. Optional arguments are listed between parenthesis (I would have prefered square brackets, but LaTeX do not like them at this place...)
Show the log and turn to interactive mode until QUIT or EXIT is entered. Type HideLog before quitting if you want to avoid disturbing log messages during batch execution.
Load the on-line help file (bpbatch.hlp) and display the description
of the given topic. If no topic is provided, or if the topic is unknown,
display the help index.
Display the string on the log. No return/linefeed is implicitely added.
Display the string on the log and go to the next line. Equivalent to
Log "text\r\n".
Log (ie. display on the log) all variables matching the given pattern. The pattern can contain wildcards (? and *).
Example: LogVars "BOOTP-*" list all BootP variables
Log (ie. display on the log) all files from the given path that match the pattern. The pattern can contain wildcards (? and *).
Example: LogDir "/usr/g*p" list files names like g...p
Log the directory tree starting with the given path as root.
Log the content of the file. The file must be no more than 64 KB big.
Make the log visible if it was hidden. Automatically performed when ESC is pressed with "$AutoShowLog" == "ON" and when entering interactive mode.
Prevent log messages to appear on the screen. Default state when BpBatch, MrBatch and MrZip are started on a script file.
Record all log output to a 64 KB buffer until EndCapture is issued. Wrap around buffer if the log output is more than 64 KB big. This command can be used to create a text file with an arbitrary content. The EndCapture MUST occurs within the same batch file.
End up the capture of the log. If a filename is given, store the captured text to a file. Otherwise, discard it.
Make a sound. This command is equivalent to Echo "\007".
This section lists commands that control the batch execution. Optional arguments are listed between parenthesis.
Load the given file and start up the parser on it. Go back to the current point when the include file processing is done. The interpretation of characters above ASCII 127 within the include file depends on the value of $IsoLatin at the time the file is included.
Setup an exit-handler that will automatically be evaluated at the end of current batch file.
Move the execution cursor to the given label (ie. the line starting with :label)
Perform all substitutions on the "command" and run the parser on it.
If (not) <expr1> (==|!=|<|>|>=|<=|=>|=<|<>) <expr2> <command> If (not) (ci) "str1" (==|!=|<|>|>=|<=|=>|=<|<>) "str2" <command> If (not) (ci) "str1" Match-Expr "pattern" <command> If (not) (ci) "str1" Match-Passwd "unix-passwd" <command> If (not) (ci) "str1" in "wordlist" <command> If (not) (ci) "str1" in-file "filename" <command> If (not) exist "filename" <command> If (not) valid <disk>:<partition> <command>
These commands execute command; if the test succeeds. The 1st form compares two numerical expressions. The 2nd form compares two strings, optionally case-insensitive. The 3rd form tests if "str1" matches the given pattern (wildcards allowed). The 4th form tests if the clear password "str1" matches the Unix-crypted password. The 5th form tests if "str1" is included in the word list. The 6th form tests if "str1" is included in the word file. The 7th form tests if the given file exists. The 8th form tests if the given partition is valid (i.e. formatted). This form is only supported by BpBatch versions after February 1999.
Set variable = "string-value" Set variable = <expr>
Setup a value for the given variable. If the given value is a numerical expresison, it will be implicitely converted to a string. A variable can be used anywhere by refering it as $variable or ${variable}. If the resulting reference is to be interpreted as a string, it should be enclosed between double quotes: "$variable" or "${variable}".
Waits until the specified duration (expressed in seconds) expired. See also the paragraph on the format of durations.
Get the CMOS time and store it into variablein the form HH:MM:SS. Get the CMOS date and store it into variablein the form YY/MM/DD. This can be used to customize the behavior of your boot scripts depending on the time of day or on the date.
Set the computer CMOS time or date to the given value. If you have a security gateway (our special TFTP server) running, you can automatically adjust the CMOS time and date of the client computers at each boot by evaluating the following command:
include "$Security-Gateway:gettime"
If you want to understand what this command does, just type:
logfile "$Security-Gateway:gettime"
Turn off the computer. This command only works if the computer is Advanced Power Management (APM) compatible.
This section lists commands that let you monitor the keyboard input. Optional arguments are listed between parenthesis. See also under National Language Support.
Indefinitely wait until a key is pressed and store it in the variable.
Wait until a key is pressed for no more than duration seconds. If no key has been pressed after the given time, evaluate the command. Otherwise, leave the key in the keyboard buffer. See also the paragraph on the format of durations.
Read a return-terminated string from the keyboard and store the result string in variable (without the terminating return). If max-length is given, do not allow the user to enter more than this number of characters.
See also GetPasswd under Security-related commands.
Setup a key handler that will automatically evaluate the given command
when the key "c" is pressed (except is explicitely waited by a GetChar
or an Input command). If the string "default" is used instead of
a single character, the command is executed if any other key is pressed.
This section lists commands used to perform regular text output. All these commands can be used in graphic mode also, with the same behaviour (except that text mode provides 80x25 characters while graphic mode provides 100x37, because graphic mode characters are of size 8x16). Optional arguments are listed between parenthesis. See also under National Language Support.
Print the specified string/expression at current cursor position and using current text attributes, then move the cursor. Add "\r\n" to the end of the string to go to the next line.
Setup the text attributes. One can also put a single numeric value representing both colors and defined as 16*bg-color+fg-color.
If you need more fantasy, you can use LoadFont. See under
National Language Support.
Move the cursor position to the specified position and evaluate the command if provided.
Example: At 10,20 Print "Gnats and rats !"
Fill the given text area with the given pattern-char (either a string or the decimal ascii code). The area defaults to the full screen, the pattern char defaults to the full block (ASCII dec 219) and the color defaults to black (clear screen). Move the cursor to the upper left corner of the cleared area.
.ATT (<attribute>) .CLS (<attribute>) .DEF <key> (<timeout_val>) .KEY <key> <filename> .POS ((<x>) <y>) .PWD <key> <cpasswd> .WLN (<text>) .WRT <text>
See InCom's manual for more infos. We wrote some time ago a program program for editing menu files using this syntax, but it is preferable to make your menus using the new explicit syntax. Note that the .PWD command is not implemented because we do not now the password crypting algorithm used by InCom GmbH.
This section lists commands used to perform graphic-mode output. For the functions listed in this section, coordinates are given in pixels. You can also use all text output commands (see above) in graphic mode. Optional arguments are listed between parenthesis.
Note that the graphic mode is automatically turned on whenever a graphic
command is used, unless the variable VESA is set to "OFF".
Turn on VESA graphics. The origin is on the upper-left corner of the screen (0 0). VESA graphics may hang some computers under Windows 95. Run MrBatch with the -v option to avoid such problems.
You can request a specific video mode if you use the parameter "mode" This parameter is optional: if you do not specify any value, the video mode will be taken from the first field of the VESA-Modes variable.
Valid modes are :
The VESA-Modes variable lists the video modes supported by your hardware.
Example: InitGraph "640x480"
Close VESA graphic mode and go back to text mode.
VESA graphics. Draw a filled bar of the given size and colors.
VESA graphics. Draw a window of the given size and colors. The background color defaults to LightGray and the title-bar color defaults to Blue. If you include a title string and a color, this text will be displayed in the title bar.
VESA graphics. Draw the text string at the given position with a transparent background. The color defaults to text foreground color.
VESA graphics. Load the given GIF-87a file and draw it on the screen. The file can be interlaced, but must be in GIF-87a (not GIF-89a). The image size should fit in the selected video mode. You cannot load a 1024x768 GIF file when you selected a 640x480 mode. The GIF position defaults to the top left corner of the screen (0 0).
The color-strategy defines the allocation of colors in the palette when more than 256 colors are needed (for instance when two 256 colors GIF files are displayed simultaneously):
Best-Colors use best possible colors for the most recent GIFSpare-Colors try to avoid allocating colors, change existing colorsShare-Colors try to avoid allocating colors, use existing colorsReuse-Colors allocate no new color, only use existing colorsBest-Colors.
This section lists commands that help you authenticate a user. Optional arguments are listed between parenthesis.
Some of these functions cooperate with a Security gateway, that you should first install. See the section on Special TFTP servers for more infos.
Same as Input, but echo stars instead of the typed characters.
Apply the Unix crypt function to the given 8-chars text and store the resulting crypted string into variable. The "salt" is usually a two-character string that will be found as the first two characters of the crypted string.
Note that Unix crypt is a one-way function. It is not possible to decode the crypted string. One can only try to crypt another string with the same salt and compre the resulting crypted string.
Crypt the given text using the given 8-chars key and store the result as an hexadecimal string in variable.
Decrypt the given hexadecimal string using the given 8-chars key and store the result in variable.
Compute the MD5 checksum of the given text and store it as an hexadecimal string in variable. Can be used as an alternative to the Unix crypt function to check for passwords bigger than 8 characters.
Connect to the $Security-Gateway and check if the given user exist
in the given radius domain and uses the specified password.
If the domain is "Unix", use the Unix user/password definition
on the security gateway. For any other domain, use the security
gateway domain definition file to determine the real Radius or NT
domain to check.
Set the value of $Security-Check to "PASSED" or "FAILED". The password do not transit in clear on the network.
This section lists commands for preparing the hard-disk. Optional arguments are listed between parenthesis.
Read the partition table(s) for the given disk and store it as a string into the given variable. The result string is a space-separated list of Type:Size, where
Setup the partition table(s) to the content of the string. The format used is the same that for GetPartitions. This command also reset all boot flags (hint: use SetBootPart).
The main partition table in the master boot record (MBR) has only four entries. Moreover, DOS and Windows accept only ONE FAT partition (called the Primary partition, C:) in the main partition table. Any supplemental FAT partition should be nested in an extended partition (and is thus called a Logical partition). If we give numbers 1-4 to the partitions described in the MBR partition table and numbers 5-8 to the partitions described in the first extended partition, the definition of two FAT partitions would work by defining partition 1 as FAT, partition 2 as EXT and partition 5 as FAT. Partitions 3,4,6,7 and 8 should be marked as UNUSED. The same scheme can be used recursively to define more than two FAT partitions: nesting another extended partition in partition 6 and adding a logical FAT partition in partition 9.
In the most strict interpretation of DOS specifications, that means that entries 3 and 4 of the partition tables are never used. In practice, some versions of DOS and some other OS are able to use more than two partitions per partition table, but there is no clear rule. On this side, BpBatch is rather flexible in its interpretation of partition tables, it can often understands things that OSes cannot.
One universal rule is that there should never be more than one extended partition per partition table, otherwise the partition numbering scheme breaks down.
If you want to try funny configurations, make your own experiments, but don't complain if the OS does not recognize your partitions. The only way it is guarantee to work is to use the primary partition to store the OS boot partition, and to nest all other partitions, one at a time, in extended partitions.
Example of extended partitions :
SetPartitions "BIGDOS:100 EXT:400 EMPTY EMPTY BIGDOS:400"
Get the partition number with the boot flag turned on (DOS says: the activated primary partition) and store it to the variable. The first partition is numbered 1. If no partitions has the boot flag turned on, answers zero.
Set the boot flag to the given partition. The boot flag let the master boot record (MBR) choose which partition to boot on. The first partition is numbered 1.
Fill the given partitions with zeroes. Can take quite a lot of time
for big partitions. Do not format the partition for any operating
system. See also Clean.
Fast-format the given partition(s) according to the type declared
in the partition table. If a label is given and the filesystem
supports it, setup the partition label. For a paranoiac full format,
call Blank on the partition first.
Clean is supported for (FAT16) BIGDOS, FAT32, EXT, LINUX-EXT2 and LINUX-SWAP
partitions. To clean the master boot record (MBR), use Clean 0.
Clean should be used on data partitions and on MBR/EXT partitions.
It is totally useless to clean a partition before unzipping a filesystem
on it using FullUnzip.
Decompress a full disk archive to the given partition, overwriting any existing file (clean-up on the fly).
FullUnzip is supported for (FAT16) BIGDOS, FAT32 and LINUX-EXT2.
This commands turn on VESA graphics to display a progress banner,
unless VESA has been turned OFF.
Decompress an incremental disk archive to the given path. Files in the archive replace those with the same name on the target path, but other files are not deleted.
IncrUnzip is supported for (FAT16) BIGDOS, FAT32 and LINUX-EXT2. This command is far less efficient than FullUnzip since the existing filesystem structure must be preserved. However, it avoids multiplying the number of different disk images by storing the differences only.
Uncompress a file previously compressed with MrZip FileZip command.
The file is validated by a 32-bits CRC.
Copy the source file to the destinaton file, byte-to-byte.
Can be used after a FullUnzip for instance to update configuration
files from the server without rebuilding the image.
Better to use FileUnzip for big and easy-to-compress files.
Copy the first, then the second file to the destination file, byte-to-byte. Can be used on arbitrary large files. The destination file cannot be one of the two source files.
Read the source file and perform variable substitution before writing it to the destination file. The interpretation of characters above ASCII 127 depends on the value of $IsoLatin.
By default, variables are recognized when prefixed by "${" and postfixed by "}". This can be changed to any other non-empty string. remember that if you want to use a dollar sign within the prefix or suffix, you must escape it or it will get macro-evaluated. For instance, if you want to explicitely use the default prefix and postfix, use:
Patch "source-file" "dest-file" "\${" "}"
Recursively create directories from the root to the given full path. If the path already exists, this command has no effect.
Remove the given file. The file must exist.
Recursively remove all files and directories under the given path, and remove the directory itself.
This section lists commands for continuing the boot process. Optional arguments are listed between parenthesis.
Restore the memory and the interrupt vectors allocated by the bootprom. All attempts to make TFTP transfers will fail after calling this command. It is usually a good idea to call this command before HdBoot, or you might run short of memory under DOS/Windows. This command is implicitely called by FloppyBoot.
Note that although this function restore all vectors "officially" rerouted by the BootProm, it does not seems to restore everything. But it works well enough for DOS and Windows.
Load a floppy disk image into the extended memory and redirect
the BIOS Disk Services to make floppy disk calls use this image
instead. This command implicitely calls HideBootProm. Call
FloppyBoot to boot on the ramdisk you just loaded.
This kind of ramdisk may not be as robust as what you get when you use the TFTPBoot command. The only advantage is that it only steals a few hundred bytes of conventional memory instead of the >64 KB reserved by the TCP/IP BootPROM. Warning, nothing secures the extended memory in which the ramdisk resides. There is no way to uninstall such a ramdisk.
Do the same as LoadRamDisk, but for an image that has been
compressed using MrZip FileZip command. Compressed ramdisks are
protected against data corruption (and uncomplete download) by a
byte count and a 32-bits CRC.
Chain to another boot file (for instance a floppy image made with InCom's BpShell program). See the file referencing conventions for accessing a file on another TFTP server.
Hide the Boot ROM, load the floppy disk boot sector and boot on it.
Load the given boot sector and boot from it. The disk default to zero, the first hard disk, and the partition defaults to zero, ie. the master boot record. You can boot from any partition, but be warned that Windows 95 may not let you boot a partition that has not been set as the boot partition (hint: use SetBootPart).
This command does not implicitely call HideBootProm, so you might want to call it before.
Load the given kernel and ramdisk into the high memory,
setup the command line and boot the kernel. It is a good idea
to put at least a minimal command line with the location of the
root filesystem (like "root=dev/hda1"/). If you are using a linux
system that heavily relies on lilo (like RedHat Linux 5.1),
it may be necessary to add to the command line something like
BOOT_IMAGE=linux. Note that the kernel
can be loaded by TFTP (automatically cached on the hard disk)
or directly from the target root partition.
This command works for small and big kernels (zImage and bzImage).
This section lists commands related not national language support. Optional arguments are listed between parenthesis.
National keyboard support. Remap given keys to other characters. For instance, to swap the Y and Z keys, use
Remapkeys "yzYZ" "zyZY"
It is a good idea to use the quoted octal notation when using characters
not included in the minimal ASCII character set, in order to avoid a
dependency to the iso-latin modal settings.
For international keyboards, there are two keys that produce a backslash
in non-remapped (US) mode. Each of them can be independantly remapped,
thanks to the fact that BpBatch sees one of them as a key answering
ASCII code 252 (octal) or ASCII code 335 (octal) when shifted.
If you send me a sample script that does keyboard mapping for
your national keyboard, I will make it available under
http://cuiwww.unige.ch/info/pc/remote-boot/soft/sample-scripts
To help you make your own keyboard mapping, I suggest pressing all special
keys without remapping the keyboard and writing down the character they produce.
These will be the original-keys. The remapped-keys simply are
the key you would have liked to see, in the same order. If some keys (either
original or remapped) produce characters above ASCII dec 127, use the quoted
octal notation. You can easily get the octal code for any given character by
looking in the ASCII table of HelpPC for instance (HelpPC is a shareware
hypertext on-line help program by David Jurgens).
National keyboard support. Remap the given keys when ALT is depressed For instance, to map Alt-2 to the ampersand sign, use
RemapAltKeys "2" "@"
Note that dead keys are not supported.
Load and activate the given binary Codepage file. Codepages are used for the translation of Unicode characters (present on VFAT valumes for instance) into 8-bits characters. If you do not have the right Codepage loaded, you will get FAT warnings while accessing the filesystem when special characters are encountred.
All binary codepage files are available at
http://cuiwww.unige.ch/info/pc/remote-boot/soft/codepage.zip
The default codepage is 850, a reordered superset of ISO-Latin-1.
If you load a more exotic codepage, you should usually turn the variable
$IsoLatin to "off" or you might get meaningless
implicit conversions. Moreover, if you want to display exotic characters,
you should also load the proper screen font (use "LoadFont").
Load and activate a VGA/VESA font, both in text and graphic mode. The font file must be a binary file of 16 bztes/characters (8x16 bitmap). This command can be used for National Language Support as well as for Fantasy support.
An archive with several fantasy fonts is available at
http://cuiwww.unige.ch/info/pc/remote-boot/soft/fonts.zip.
This archive also contains a program to extract fonts for your codepage
from the DOS .CPI file.
Source (i)archive "filename" Source path "path"
Set the source for the archive manipulation to the given (incremental) archive file or disk path.
Dest (i)archive "filename" Dest (i)dump Dest path "path"
Set the destination for the archive manipulation to the given (incremental) archive file, dump or disk path. To control the quantity of data displayed during dump, use the $DumpFormat special variable.
Compress a file for further decompression with FileUnzip or for using as ZRamDisk. The file is validated by a 32-bits CRC.
Filter -"pattern" Filter +"pattern"
Avoid/allow files and directories matching the given pattern (wildcards allowed) to be included in the archive. The pattern is matched agains the full pathname. By default, all files are included in the image. You only need to explicitely allow files that where cancelled by a filter. Each negative filter has its own positive filter (allowed) sublist.
For DOS/Windows images, you will typically use
Filter -"*.swp"
Filter -"temp/*"
and for Unix images, you will typically use
Filter -"var/log/*"
Filter -"tmp/*"
Start the archive manipulation operation, according to source, destination
and filter settings. Except in a few circumstances, you will probably use
the shortcut below instead of explicitely calling CopyArchive.
One circumstance in which you will use CopyArchive explicitely is
when you want to change the fragmentation of an image, as follow:
set FragmentSize="30 MB"
Source archive "original.imz"
Dest archive "refragmented.imz"
CopyArchive
Shortcut for
Source path "path"
Dest archive "full-archive"
CopyArchive
You should usually first setup filters.
Shortcut for
Source path "path"
Dest iarchive "incr-archive"
CopyArchive
Shortcut for
Source archive "full-archive"
Dest dump
CopyArchive
Shortcut for
Source iarchive "incr-archive"
Dest dump
CopyArchive
Shortcut for
Source path "srcpath"
Dest path "dstpath"
CopyArchive
Nobreak.sys is a very small (about 350 bytes only) driver that
you include at the beginning of your config.sys. Its goal is
to secure the boot process, until the user is logged in.
DOS provides a setting for this (namely BREAK=OFF), but it is not
drastic enough, and has almost no effect in the autoexec.bat.
Our driver works by modifying the scan-code of the key
pressed when a break is requested, directly at the BIOS level.
This way, no program at all can receive a break until break is
enabled again.
The driver must be loaded from the config.sys (or using the devlod
program from Undocumented DOS). Afterwards, break can be
enabled by sending Yes to the NOBRK pseudo-device,
and disabled again by sending No (in fact, only the first
character, Y or N is significant).
As this driver relies on the BIOS, it does only work for DOS and Windows 3.1. Windows 95 has its own low-level keyboard handling routines.
Assembler source code is available.
As the only network support available in the TCP/IP BootPROM is TFTP, there is a special interest in enhancing TFTP servers for providing new capabilities.
InCom GmbH distributes with the TCP/IP BootPROM an enhanced TFTP server that can send packets of up to 1408 bytes instead of the standard 512 bytes. This is a great enhancement that you should use. This server is available on the TCP/IP Bootprom Utility disk for Solaris, Windows and as Netware NLM.
We built a modified version of Linux TFTP server that acts as InCom
enhanced TFTP server. Basically, we simply changed the packet size from
512 to 1408 bytes and the port from 69 to 59.
It is available from
http://cuiwww.unige.ch/info/pc/remote-boot/soft/etdtpd.tar.gz.
We wrote a special TFTP server that serves as security gateway for
authenticating users. This server runs under Linux or Solaris,
and can authenticate users according to a Unix password database
(NIS and shadow passwords are supported), a Windows NT (or Samba)
server or a Radius server.
It is available from
http://cuiwww.unige.ch/info/pc/remote-boot/soft/stdtpd.tar.gz,
with source and precompiled binaries.
The precompiled binaries do not
include NT password encryption as we cannot distribute libdes
but compilation is straightforward.
In order to use the security gateway, you just have to setup a trivial
security domains configuration file that describes to which
authentication server each logical security domains maps (the Unix
domain implicitely maps to the server Unix password database). This is
a sample configuration file:
#
# STFTPD configuration file
#
# This file specify the server of the "security domains". Two types of
# authentication servers are supported : radius or winnt (winnt includes
# NT Server and Samba)
#
# Format of radius servers
# radius <domain> <serveraddress> <secret>
#
# secret is the secret word as specified in your /etc/raddb/clients file
#
# Format of SMB servers
# winnt <domain> <serveraddress> <netbiosname>
#
# netbiosname is the NETBIOS name of your server
#
# Examples
radius sec-dom-rad radiusserver testing123
winnt sec-dom-nt1 192.168.1.1 NTSERVER1
winnt sec-dom-smb samba SAMBA1
security = user.
You can also provide to the security server a file containing a list of users which are not allowed to log on (for which the check will fail anyways).
We wrote a special TFTP server that implements a home-made Broadcast
variant of TFTP. Using this server, we were able to download
images to 25 clients on a heavily loaded 10 Mb ethernet network
at 6 Mb/s (it is more efficient than the regular TFTP because
it does not need to acknowledge each packets).
This server runs under Linux or Solaris.
It is available from
http://cuiwww.unige.ch/info/pc/remote-boot/soft/btdtpd.tar.gz,
with source and precompiled binaries.
As the TCP/IP bootprom does not support this protocol, our solution consist in booting a tiny ramdisk-based linux system using the tools described in this document, and running the Linux version of MrBatch which has built-in support for Broadcast TFTP. A simple batch file can the download all files to the cache in a few minutes, simultaneously on all client computers. You do not need to install Linux yourself to use this package, except if you have exotic hardware and cannot directly use the kernel provided in the package.
The process works as follow. First, you startup the broadcast server manually, giving the number of expected client computers as argument (remember, this procedure is not to be used every day but only when you changed an image and want to ensure it is immediately uploaded to all your client computers). Then, you turn on all client computers, which will run the following BpBatch script:
#
# This batch is run by bpbatch to launch a mini-linux using an initial
# ramdisk, which will then run mrbatch under linux.
#
# The broadcast TFTP protocol only works with the Linux implementation of
# mrbatch, because of the lack of broadcast support in the bootprom itself.
#
# 1. Setup a tiny partition, to let a lot of space for the cache
setpartitions "BIGDOS:50"
# 2. Clean the MBR
clean 0
# 3. Run a Linux Kernel with initrd (Initial Ramdisk) supprt, and use
# bcastrd.gz as the initial ramdisk (will be mounted root and then
# executed via /linuxrc). See initrd.txt for more details about
# initial ramdisks. You don't have to specify a root device (second
# parameter is null) to the kernel, it will use the initial ramdisk.
linuxboot "linux.krn" "" "bcastrd.gz"
# 4. The initial ramdisk will run dhcpcd to setup networking using DHCP.
# It will then run mrbatch -w bcastlx
dhcpcd, a DHCP client used to setup networkingmrbatchlinuxrc, a little wrapper automatically started by initrd and
that starts dhcpcd then mrbatch.usr/lib/terminfo/l/linux, used by MrBatchdev/*, devices needed to run Linux and mrbatchlibc.so
which is really huge. The resulting ramdisk is Gzipped and takes
less than 300 KB. The kernel itself takes 450 KB (with many network
cards and initrd support).
When Linux is up and running, MrBatch is called with the following script
(that you should edit for your needs):
# This file is executed when mrbatch is launched by the initial ramdisk
# bcastrd.gz
# It's main purpose is to "broacast copy" files to the cache
#
# 1. Be verbose
showlog
# 2. Don't want a "press a key"
set pauselog="OFF"
# 3. Set partitions at their final values.
# Important: Since you will copy files into the cache to be used in future
# boot, you need to specify the same partitions as in the future boots.
setpartitions "BIGDOS:1024"
# 4. Clean the CACHE partition
clean -1
# 5. And the copy files into the cache, using the Broadcast TFTP protocol
# (port 99)
#
# You can use the script "as is", but you surely need to modify the following
# line ! In our example, we download the file mblinux.imz, which is the image
# file for our installation of Linux.
copy "$BOOTP-Server-IP@99:mblinux.imz" "{:-1}mblinux.imz"