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Hollywood, MD (December 15, 1999) -- Easy Software Products today announced the 1.0.3 release of the Common UNIX Printing System ("CUPS"), an IPP-based printing system for UNIX®
CUPS 1.0.3 is a bug fix release, includes improvements to the HP-GL/2 and image file filters, and provides better error recovery when printing to networked printers. CUPS 1.0.3 can be downloaded from the CUPS web site at http://www.cups.org.
The Common UNIX Printing System provides a portable printing layer for UNIX® operating systems. It has been developed by Easy Software Products to promote a standard printing solution for all UNIX vendors and users. CUPS provides the System V and Berkeley command-line interfaces.
CUPS uses the Internet Printing Protocol (IETF-IPP) as the basis for managing print jobs and queues. The Line Printer Daemon (LPD, RFC1179), Server Message Block (SMB), and AppSocket protocols are also supported with reduced functionality.
CUPS adds network printer browsing and PostScript Printer Description ("PPD")-based printing options to support real world applications under UNIX.
CUPS also includes a customized version of GNU GhostScript (currently based off GNU GhostScript 4.03) and an image file RIP that can be used to support non-PostScript printers.
Sample drivers are provided for HP DeskJet and LaserJet printers. Drivers for over 1600 printers are available in our ESP Print Pro software.
CUPS is licensed under the GNU General Public License. Please contact Easy Software Products for commercial support and "binary distribution" rights.
WebRAT consists of :
client part which is a set of cgi scripts, establishing connection to the servers, transferring requests, getting the answers, providing these answers to the user through dynamically created web pages.
- The administration server which is a single perl script, waiting (through inetd) for connections, from the
clientscripts, from which accepts (or denies) the requests, authorizes the user, calls the appropriate administrative script, and provides the results of the action requested (which is the output of the administrative script)
- The administrative scripts are scripts that do one and only job, called by the
- The nodes' daemon is the equivalent of the
administration server, exists in every node to be administered, accepts (through inetd) connections from the clientscripts (or the administration serverunder certain circumstances), authorizes the user, calls the appropriate server script, and provides the results of the action requested (which is the output of the server scriptas an answer to the client script.
- The server scripts are scripts that do one and only job, called by the
That may seem complicated, but once implemented, it is very easy to maintain, and extend. The system is supposed to be modular, and although adding modules is not (yet) the easiest thing to do, it will be much more easier in the future, once the
module addingmodule is implemented.
The difficult part is in the design and the implementation, thus hiding all the complexity from the user of the system.
The way it works
WebRAT relies on a administration server which has the responsibility of keeping the hosts-to-be-administered database. Adding/removing nodes is on of the administration servers' responsibilities. Every node has its own "password" file, keeping user/module pairs, from which the node may authenticate if a user is allowed (or not) to use the specific module. This (password) file is also handled by the administration server. You may NOT add users of the system through the node, you have to add them through the administration server.
administrative scripts exist in order to handle administration server's requests. These should be considered as part of the administration server itself, but the choice to be different scripts was made in order to make all the scripts small and compact, for easier maintenance.
Each and every node has its own
daemon, and a set of server scripts. Those have the same relationship as the administration serverto the administrative scripts. Every user registered to perform tasks to the system may access the daemon, which allows him access to these tasks only. So, the superuser may distribute tasks to unprivileged users
Authentication is performed in every stage of the process, so that someone cannot override the client.
As WebRAT relies on a WebServer, and the daemons are called through inetd, the whole system may be extremely secure, by the usage of independent, open source software, such as OpenSSL and TCP/wrappers.
WebRAT is written in perl, in order to
- avoid buffer overflows (common problem when someone writing daemons doesn't know C very well like me)
- be easily customized
- be easily maintained
- be easily modularized
- give the user the ability to check the code (as these scripts are executed as privileged user, i.e. root) in an easy understandable language
That last part is also the reason the scripts are not so compact. They could have at least 20% of lines of code less, if I was trying to make them compact, but I preferred to make them easily understandable
You may take WebRAT's latest version from here
I'm proud to announce a new release of the Monitoring and Administration Tool (MAT). New to version 0.20 is the replication module. This allows replication between UNIX hosts. A HPUX agent is now included, as well as a GNU libc build. There are several bug fixes in the backup module, as well as some fixes to the system monitoring module.
The MAT web site is at: http://www.ee.ryerson.ca/~sblack/mat
It contains screen-shots, as well as descriptions of MAT's functions.
Below is a description of this release of MAT.
Monitoring & Administration Tool (MAT)
MAT is an enterprise monitoring and administration tool. It allows you as an administrator, or authorized individual, to manage a hetrogeneous UNIX network. It hides most of the complexity of the standard configuration files making it easier administer. The monitoring daemon provides historical information about a hosts status. Several monitored parameters can be graphed to aid capacity planning. The monitored parameters can trigger events when a threshold is exceeded, alerting administrators to problems.
Some of the advanced features include the ability to upgrade it's self as new versions, or upgrades become available, the ability to allow other users to control some or all of the administrative functions. The ability to see the "health" of a host.
MAT is in three parts, the MAT agent, the MAT daemon, and the MAT console. The MAT agent does the actual work of modifing files, running commands, and inspecting the system. The MAT daemon MATd periodically monitors system parameters, and can send alarms. The MAT console provides an easy to use GUI which sends commands to the MAT agent to manipulate and query standard UNIX configuration files. It also provides an easy to use GUI for graphing the MATd results and controlling the parameters monitored by MATd.
MAT is available for Linux, SunOS 4.1.x, and Solaris. An alpha port to IRIX 6.x is included. Currently MAT allows you to add, modify and delete the following:
- Users (Site specific user defaults are supported)
- Email Aliases
- Mounted filesystems
- Crontab entries
- DNS client configuration
- Login message (motd)
- Exported (shared) filesystems
- DNS domains & records
- Most NIS records
- Syslogd entries
MAT allows you inspect many of the common system parameters including:
- All syslog files (TK 8.0 recommended for this)
The monitoring deamon MATd runs scripts for monitoring of:
- Network Connectivity (through ICMP)
- Required Processes
- Disk usage
- CPU use
- Run queue
- User logins
- FTP server status
- SMTP server status
- Network Interface Activity
SWAP, and Memory use are monitored in the Linux version. A simple plotting tool allows you to graph the various monitored parameters. The monitoring scripts are written in Perl, and should be easy to customize and expand. The MAT probe has been updated to display it's current status.
For the MAT agent you need a UNIX machine running:
- Linux 2.x
- SunOS 4.1.4
- Solaris 5.x
- IRIX 6.x
- HPUX 10.10 or 10.20
Perl 5.x is needed for the monitored parameters and alarms. The Console requires Tcl/TK on at least one host.
June 07th 1999, 23:04 EST durep is a perl script used for disk usage reports. It can generate text output with bar graphs to allow easy comparisons of disk usage between directories. It can also generate web pages which can be navigated through the directory structure. This allows easy visual monitoring of disk usage.
You are no longer restricted to native executable file formats (ELF, a.out, etc), in Linux. With kernel 2.2 onwards, there's support for multiple file formats, that is, you can make the kernel recognize any file format provided you've an interpreter for it. These files can then be run just by typing their name at the prompt, like any pure executable. You could, for instance, associate all text files with the vi editor. Whenever you type the name of a text file on the shell prompt, the vi editor will automatically load with this file.
The Unix::ConfigFile distribution is a suite of modules that provide simple interfaces to various Unix configuration files. The objective is to free the system administrator from dealing with the trivial formatting details of the files, and allow him or her to concentrate on the information therein. Currently supported files include:
- aliases - Unix::AliasFile
- automount - Unix::AutomountFile
- group - Unix::GroupFile
- passwd - Unix::PasswdFile
NetBench 5.01 shows how well a network operating system does at the mundane task of file serving, by measuring Wintel file input/output. Natively, Linux doesn't work with DOS/Windows files, but Samba, an open-source Server Message Block (SMB) client and server that ships with all commercial Linuxes, provides that capacity. And how!
You might think that Linux would operate at a disadvantage here, but Linux kicks NT's butt. Only at the lightest loads does NT hold any advantage over the Linuxes. Once the load moves to 12 clients, all the Linux platforms take commanding leads over NT. At 32 clients, SuSE, the weakest Linux, has more than double NT'
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Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds : Larry Wall : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOS : Programming Languages History : PL/1 : Simula 67 : C : History of GCC development : Scripting Languages : Perl history : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history
The Peter Principle : Parkinson Law : 1984 : The Mythical Man-Month : How to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Hater’s Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite
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The Last but not Least
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Last modified: September 12, 2017