home *** CD-ROM | disk | FTP | other *** search
- ************************************************************************
- * GUARDIAN v1.2 *
- * Antivirus Bootstrap *
- * Copyright 1988 by Leonardo Fei, via A. Fava 6, 20125 Milano, Italy *
- * Distributed by Transactor (UK) Ltd, Unit2, Langdale Grove, *
- * Bingham, Nottinghamshire, England, NG13 8SR *
- * *
- * IMPORTANT NOTE: This version is not Public Domain, nor Shareware. *
- * All rights are reserved to the author. *
- * Please respect this copyright notice ...Thanks! *
- * *
- ************************************************************************
-
- The first version of Guardian was written, on impetus, in a few days,
- after I discovered that a new virus had infected most of my disks.
-
- Guardian v1.2 has been greatly enhanced, both in terms of security and of
- versatility. If you are using Kickstart 1.3 (v34.5) you will find Guardian
- v1.2 very useful in helping you do things you couldn't normally do without
- it.
-
-
- "DANGER !!! - I can't succeed in rewriting the bootblock !"
- -----------------------------------------------------------
- A new feature has been added to Guardian v1.2. After the standard bootblock
- has been written to the disk, the newly created bootblock is loaded into the
- memory once more, and is compared with the standard one. They should match,
- of course. But if they don't, this means that something serious has
- happened to the trackdisk device.
-
-
- -a flag
- -------
-
- This is a new v1.2 feature.
- Guardian, by default, installs itself in a 'kind' way, saving the
- vectors that KickTagPtr and KickMemPtr may contain, but can't
- distinguish between a good and a bad boy. The new ram disk (RAMB0),
- that comes on the Workbench 1.3 (v34.4) disk, for example, creates a new
- entry into both of these vectors. This is a 'good boy'. The 'BYTE
- BANDIT' virus, on the other hand, is a 'bad boy' (not to talk about the
- impolite way it throws itself into KickTagPtr, shutting the door upon
- all the others !). If you don't want the contents of these vectors to
- be preserved, you can use the -a (angry) flag when launching Guardian
- for the first time. This will force it to clear these vectors before
- installing itself, un-mounting other programs that will be flushed
- during the reset. If Guardian is already mounted and you launch it with
- the -a flag, it will move its entry to the top of the list and remove
- all the others from the same. Note that they won't be removed from
- memory until the next reset.
-
- Use of the -a flag is usually not required (and not advised, if you are
- running something like RAMB0 device, or other programs that use the
- resident modules technique to survive through the reset).
-
- A common situation where the -a flag is required is the following one:
- Guardian is not installed and you boot with a 'BYTE BANDIT' infected
- disk. The virus activates itself, then the startup-sequence is executed
- and Guardian launched. If you didn't use the -q flag (more about this
- later), you'll get the alert about the Interrupt Vectors. Restore them.
- Then launch Guardian again, this time with the -a flag, put a safe disk
- into the internal drive and reset with CTRL-AMIGA-AMIGA.
-
-
- -q flag
- -------
-
- A new Guardian v1.2 feature is the ability to check the interrupt
- vectors table for values not standard, and the reset capture vectors to
- see if they're not empty.
-
- By default, this security operation is performed each time you launch
- Guardian, but can be turned off by using the -q (quiet) flag. This
- feature was implemented because these are critical points and are used
- for virus operations, the first (interrupt vectors) by the 'BYTE BANDIT'
- virus, the second (reset capture vectors) by the 'SCA' virus. If you
- have one of these virus already in the computer when you launch Guardian,
- you'll get one of the two alerts, and you'll be given the chance of
- replacing the standard values into the interrupt vectors table, or of
- clearing the reset capture vectors.
- Usually, you can keep an eye over these vectors, to see that nothing
- mess with them, by simply launching Guardian without the -q flag.
- If you are running some strange program that alters some of them, you
- can force Guardian to ignore the situation by using this flag.
-
-
- "WARNING !!! - Reset Capture vectors are not empty !"
- -----------------------------------------------------
-
- If you are infected by the 'SCA' virus, you can safely eliminate it, by
- cleaning the reset capture vectors.
-
-
- "WARNING !!! - Interrupt vectors are not standard !"
- ----------------------------------------------------
-
- If you are infected by the 'BYTE BANDIT' virus, you can choose to
- replace the standard interrupt vectors, but you won't be necessarily
- safe. This depends whether you launched Guardian with the -a flag or
- not. If the -a flag was used, first you get the alert about the
- IntVectors (replace them!), then Guardian clears the KickTagPtr (thus
- eliminating the virus's entry), installs itself and (if launched for the
- first time) reset the computer, forcing it to rebuild libraries's offset
- tables. This way the virus is flushed also from the trackdisk device.
- If you didn't use the -a flag, the resident entry of the virus is
- preserved, and the virus can mess with the trackdisk device again. If
- this happens, you should either turn off the computer and boot with a
- safe disk, or launch Guardian using the -a option and then reset the
- machine to flush the virus from the trackdisk device.
-
-
- -k flag
- -------
-
- A new v1.2 feature, is the -k (kill) flag. If for some strange reason
- (incompatibility ? not likely !) you wish to get rid of Guardian, you
- can do it by using the -k flag. The resident module will be removed
- from the list and its memory will be available after the next reset.
- Use of the -k flag removes any Guardian version that is currently
- active. If you are running with the older v1.1 and want to replace it
- with the new v1.2, you need not use this flag. Just launch v1.2.
- The latter will replace the first, and will discard it from memory.
- Please note that you can't launch v1.1 with v1.2 already in memory,
- because this will lead to a reset loop. If you run into this situation,
- take out the boot disk from the internal drive, reset with CTRL-AMIGA-
- AMIGA and replace the old Guardian with the new version, in all of your
- disks.
-
-
- Special Kickstart 1.3 (v34.5) flags
- -----------------------------------
-
- If you are running with Kickstart 1.3 (v34.5), you'll be able to use two
- extra flags and four hot-keys. With Kickstart 1.3 (v34.5) you can boot,
- not only from the floppy disk, but also from a hard disk and from the
- new ram disk (RAMB0). But if you want to boot from the ram disk, you
- have to put a not-installed floppy disk into the internal drive or take
- the bootable floppy out from the drive during each boot. Guardian lets
- you decide whether the bootstrap should test the presence of a bootable
- floppy into the internal drive or the presence of the ram disk first.
- Usually the strap module tries to boot from the floppy disk first. If
- this fails, it tries to boot from ram disk, and if also this fails you
- are requested to insert a disk.
-
-
- -r flag
- -------
-
- If you launch Guardian with the -r flag, this order will be changed.
- Bootstrap will first attempt to boot from the ram disk, then from the
- floppy, and finally it will request the insertion of a disk.
-
-
- -f flag
- -------
-
- You can use the -f flag to bring things back as they used to be: first
- try from floppy then from ram.
-
-
- Hot-keys
- --------
-
- If you selected boot from ram disk, and need to force it from the floppy
- disk, there are two hot keys implemented for this purpose. As soon as
- the power led stop flashing during the reset process, the screen becomes
- light grey, and then white. As soon as it becomes white, you can press
- the Left AMIGA key to force boot from floppy disk. If you press the
- Left ALT key, the boot screen will be displayed and hold until you
- release the key, and bootstrap will start from floppy disk.
-
- If, on the contrary, you have selected boot from floppy disk and need to
- force it from ram disk, press the Right AMIGA key. If you press the
- Right ALT key, the boot screen will be displayed and hold, until you
- release the key, and bootstrap will start from ram disk.
-
- The Left/Right ALT keys were implemented to let you check for the
- presence of the Guardian label on the boot screen.
- Please note that when I say "force boot from.." I mean that the
- bootstrap will try to boot FIRST from that device. If this is not
- possible, it will still try to boot from the other devices available.
-
-
- A final word on Kickstart 1.3 (v34.5)
- -------------------------------------
- I'm not sure whether this Kickstart version is going to be the final
- release or not, but since it's widely spread among A1000 users, I've
- tuned this Guardian version to work with it. If the official
- release will be different, please return this copy, along with its
- serial number, to Transactor (UK) Ltd or to the author for prompt
- sending of the new Guardian version at the cost of postage only.
- We will be able to fulfill this request from registered users only.
- Don't forget to enclose you serial number to any communication with us.
-
-
- A final word about Guardian v1.2r
- ---------------------------------
-
- To give you a higher degree of safety from viruses, I created Guardian
- v1.2r, which is to be installed on the Kickstart disk directly, in place
- of the never-used Debug() function. This way, you won't have to care
- about the first boot and things like that. If you own an Amiga 1000,
- you can use Creator to modify a copy of your original Kickstart
- disk. Simply launch this program and follow the instructions. Now you
- can use the modified Kickstart disk in place of the original one.
- You won't be able to use the -a, -k, -f, and -r flags, because they are
- implemented in the startup code of Guardian v1.2, but you can still use
- the hot-keys which are controlled by the bootstrap itself. If you
- launch Creator to modify a Kickstart 1.3 (v34.5) disk, you'll
- be asked to select default boot from Floppy or Ram disk. This selection
- will be 'burned' into the Kickstart-resident Guardian code, thus it'll
- be used each time you load that modified Kickstart, until you use
- Creator on that disk again. I suggest you to set the default
- boot from Ram disk, and to use the Left ALT/AMIGA hot-keys when you need
- it to happen from floppy disk. When you are running with Guardian into
- the Kickstart, you can anyway launch Guardian v1.2 in your startup-
- sequences, to test the interrupt and reset capture vectors.
-
-
- Guardian v1.1 was developed to work on A500/1000/2000, (v1.1r works on
- A1000 only), with Kickstart release 1.2 (v33.180).
-
- Guardian v1.2 was developed to work on A500/1000/2000, (v1.2r works on
- A1000 only), with Kickstart release 1.2 (v33.180) and 1.3 (v34.5).
-
-
- Please don't pirate this program. We've kept the price of this software
- so low that there's really no point in pirating it. This is more a
- service offered to the readers of "Transactor for the Amiga" than a
- commercial program on its own. If you've got this as a pirate copy,
- please don't spread it further and send 3 pounds (6 USD) to the author
- or to Transactor (UK) Ltd. You'll get a disk with the last Guardian
- version and a serial number to use for the next upgrade and for general
- support about any problem you may have with Guardian. Thanks !
-
- (May 19th 1988)
-
- Leonardo Fei Transactor (UK) Ltd
- via A. Fava 6 Unit 2, Langdale Grove
- 20125 Milano Bingham, Nottinghamshire
- Italy England, NG13 8SR
-
- BIX: LFEI
-
-