576 lines
21 KiB
Plaintext
576 lines
21 KiB
Plaintext
The Linux Alphanumeric Pager Gateway Mini-HOWTO
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Tanmoy Prasad
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Expert Software Consultants Ltd.
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C -17 Almora Bhawan
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New Delhi
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110 049
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INDIA
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Lilytanmoy@id.eth.net
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Revision History
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Revision 1.0 25 July 2001 Revised by: Tanmoy Prasad
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Originally Drafted By Chris Snell, Jun 23 17:55:14 MDT 1996
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-----------------------------------------------------------------------------
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This is Mini How-To, which discusses the compilation and installation of
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e-mail to Pager Gateway.
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PREFACE & DISCLAIMER:
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This document was lying un-maintained. As I am also working in similar field
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so I, decided to maintain this document. Originally Mr. Chris Snell wrote
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this document. Anybody who wants to refer to the older document can find it
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at the Pager FTP Site://ftp.cs.unm.edu/pub/chris/paging"
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In spirit, this document is same as what Chris Snell wrote. I have only made
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minor modifications with the code to make it work with latest Kernel Version.
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I have mainly tried on Redhat Linux 6.0 , Kernel version 2.2.5 and Madrake
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Linux 7.2 and Kernel version 2.2.17.
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If you blow up your computer/pager/modem or ruin your company network trying
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to set this up, don't blame me. Most likely, you won't mess up anything but I
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should warn you that sendmail is a tricky thing to play with and you will
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definitely be playing with it if you follow this document.
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PURPOSE:
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This mini-HOWTO will describe how to set up an Alphanumeric Paging Gateway on
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any linux machine. Your gateway will be able to send messages originating
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from both the World Wide Web and the Internet e-mail system to your
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alphanumeric pager. This is especially convenient, because no special skills
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are required for someone to send a message to your pager. All they must be
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able to do is use e-mail or the World Wide Web.
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**SPECIAL NOTE: **
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This document does not cover the setup of paging gateways, which are intended
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to send messages to non-alphanumeric (i.e. numbers-only) pagers or voice
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pagers. You'll need to look elsewhere for that information.
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REQUIREMENTS:
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<EFBFBD><EFBFBD>*<2A>One or more alphanumeric pagers (see the ABOUT ALPHANUMERIC PAGERS
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section)
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<EFBFBD><EFBFBD>*<2A>A machine running linux
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<EFBFBD><EFBFBD>*<2A>A working modem (manual recommended!)
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<EFBFBD><EFBFBD>*<2A>A telephone line
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<EFBFBD><EFBFBD>*<2A>An Internet connection (if you wish to use the WWW interface and the
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net-wide e-mail interface)
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<EFBFBD><EFBFBD>*<2A>Compiler tools (gcc, make, etc. and some basic knowledge of their use.)
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<EFBFBD><EFBFBD>*<2A>The sendmail electronic mail handler (you probably have this)
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<EFBFBD><EFBFBD>*<2A>- a working httpd (web server) if you want to create a WWW interface
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ABOUT ALPHANUMERIC PAGERS:
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Alphanumeric pagers are available from most reputable paging companies. You
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can get one at a very reasonable cost. Nowadays it comes bundled with the
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Pager subscription. Anyway cost varies from country to country and you can
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check with your Pager service provider.
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Here are some things to look for when you go shopping for your pager:
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<EFBFBD><EFBFBD>*<2A>Is this a name brand (i.e. Motorola or the like) pager?
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<EFBFBD><EFBFBD>*<2A>*MOST IMPORTANT* Does this pager support paging via a dial-up line
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provided by your pager company? (See THE DIALUP PAGING LINE section).
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<EFBFBD><EFBFBD>*<2A>Does its memory have enough room for the pages you wish to receive?
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<EFBFBD><EFBFBD>*<2A>How reputable is the company? (See THE DIALUP PAGING LINE section)
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I don't work for any pager manufacturers. I agree with Chris on recommending
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the Motorola line of pagers. As per Chris Snell " I own one myself and will
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testify to their reliability and durability. In fact, mine has been dropped
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onto the concrete on many occasions and did not sustain so much as a chipped
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case." You can find this line of pagers on Motorola's web site at: URL="http:
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//www.mot.com/MIMS/MSPG/Products/Alpha/".
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I have used one provided by my pager company along with subscription. I know
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it is not Motorola but in last one year I have to get it replaced once. So be
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sure of the brand and quality of the pager you buy.
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THE DIALUP PAGING LINE
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In order for your gateway to work, we need a way to deliver the messages to
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your paging company, which encodes them and transmits them over the air to
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your pager. This is done via a dial-up (modem) connection with your paging
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company. Without this connection, you cannot setup a paging gateway.
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Therefore, it is very important that your paging company have such a dial-up
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line. Unfortunately, many paging companies either do not have such a dial-up
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line or do not know about the line they have. When inquiring with a paging
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company about this line, I found it helpful to ask if they could provide
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"computer software to send an alphanumeric page with". If they make available
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such software, you can bet that they make the dial-up line available that is
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necessary to use it.
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SPECIFICS ON THE DIALUP LINE
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The dial-up line is simply a modem on a remote computer (or possibly some
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kind of specialized box). The modem usually connects at 33.6/56.6 KBPS but in
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case of modem dial-up line of paging companies it work at 300-1200bps. Some
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may provide connection using v.22b at speeds up to 2400bps. Once the
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connection is made, your computer sends the page to the Paging central by
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using a protocol known as TAP (formerly known as IXO). The Paging Central
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finally sends the message to the pager. For running the Paging gateway, you
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do not need to know the details of this protocol, but if you are interested,
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check out the following document on following ftp site:URL="ftp://
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ftp.cs.unm.edu/pub/chris/paging/ixo.txt"
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HOW YOUR GATEWAY WILL WORK
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Before we proceed, I am providing a brief explanation of how the e-mail->
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pager gateway will work. The WWW gateway is similar and will be explained
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later.
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1. Someone sends a message intended for your pager via e-mail to a special
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address on your linux machine.
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2. Your machine, using sendmail, accepts the message and routes it to a
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filter program, which strips the message of its header and parses out
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important information like the sender's name and e-mail address and the
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subject of the message. This filter also strips the message of any
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.signature lines so that they do not clog your pager with unimportant
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information.
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3. The paging filter passes the message onwards to the "sendpage" paging
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software, which queues it for delivery.
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4. Sendpage then dials your paging company's dial-up line and (using TAP)
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sends the message to the Paging Central.
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5. Paging Central of your paging company then beams the message to your
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pager over the radio waves.
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BEGINNING THE SETUP
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The setup of the Pager gateway consists of four parts:
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<EFBFBD><EFBFBD>*<2A>Setting up sendpage
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<EFBFBD><EFBFBD>*<2A>(Optionally) Getting a special DNS entry added for your paging gateway
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<EFBFBD><EFBFBD>*<2A>Setting up linux to handle multiple IP addresses
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<EFBFBD><EFBFBD>*<2A>Setting up sendmail to handle the message routing
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<EFBFBD><EFBFBD>*<2A>Setting up the World Wide Web interface
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GETTING THE SOFTWARE
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Every piece of software necessary to set up this product can be obtained from
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the site, ftp://ftp.cs.unm.edu/pub/chris/paging. I will try to keep these
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files at some other alternate sites. In near future I will try to package
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this as an RPM so that installation becomes easy. Next revision of this
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document may see that change.
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SENDPAGE SETUP
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Sendpage is the most important component of your paging gateway. To get
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anywhere in this project, you will need to obtain this software and compile
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it on your machine. The sendpage software can be obtained via ftp at://
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ftp.net.ohio-state.edu/pub/pagers/sendpage7a.tar.Z" or from following
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machine: ftp://ftp.cs.unm.edu/pub/chris/paging/sendpage/sendpage7a.tar.Z".
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Create a "paging" subdirectory on your machine. Fetch this software and
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unpack it using the command "tar zxvf" in the paging subdirectory created.
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At this point, I would strongly suggest that you read all the configuration
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information and README and INSTALL files in the sendpage package. However,
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ignore all the discussions on the setup of sendmail, instead, rely on the
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procedure provided in the document. Follow the instructions in the INSTALL
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file for compiling sendpage.
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Here are a few notes about the settings in the sendpage.h file, which you
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will need to edit:
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<EFBFBD><EFBFBD>*<2A>Make sure you have the "#define ARSYSTEM_NOTIFIER" line commented out
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(using "/*" and "*/") unless you own the commercial Remedy system monitor
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package.
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<EFBFBD><EFBFBD>*<2A>Following the ARSYSTEM_NOTIFIER line, there are a few Linux (POSIX)
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specific lines that need to be defined:
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<20><>+<2B>#define POSIX_SIGNALS
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<20><>+<2B>#define POSIX_OPEN
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<EFBFBD><EFBFBD>*<2A>For the modem definition, I recommend using:#define MODEM_DEV "/dev/
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modem" or "/dev/cua0" [com 1] or "/dev/cua1" [com 2]. In new Kernel
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version it is better to use "/dev/ttyS0" or /dev/ttyS1" etc.... If you
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have new version then use use the later one else you use the previous
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one.
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<EFBFBD><EFBFBD>*<2A>For the modem init, I use the simple string and rely on NVRAM settings
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instead:#define MODEM_INIT ATEVXH.
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<EFBFBD><EFBFBD>*<2A>I use RTS/CTS flow control:#define C_FLAG CTRSCTS|HUPCL.
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<EFBFBD><EFBFBD>*<2A>and DTR toggle#define TOGGLE_DTR
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*** If you are interested, my sendpage.cf is available in it's entirety from
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the following ftp site: ftp://ftp.cs.unm.edu/pub/chris/paging/sendpage/
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sendpage.h.example".
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If your Linux kernel version is 2.2.x then do following changes, in following
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files:
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i. client.c
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ii. config.c
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iii. deamon.c
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iv. deliver.c
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v. sendpage.c
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vi. verify.c
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Instead of #include DB.h put #include DB185.H DB185.H
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CONFIGURING YOUR MODEM
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I use a D-Link DFM-560 E which seems to work fine with sendpage. With other
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modems, your milage may vary (possibly for the better). Although your paging
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company's modem (referred to by sendpage as "Paging Central") could very well
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be different from mine, you may want to try this setup to see if it works.
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You should have your modem manual handy as a reference for the proper init
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string. Here is what I have set:
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<EFBFBD><EFBFBD>*<2A>Modem set to v.22bis 2400/1200 protocol (*no* auto-negotiate)
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<EFBFBD><EFBFBD>*<2A>Serial port at 1200bps
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<EFBFBD><EFBFBD>*<2A>Your init string sendpage.h should take care of:- Numeric (non-text)
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responses [these are must!] i.e.:
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<20><>+<2B>0 for "OK"
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<20><>+<2B>5 for "CONNECT 1200"
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<20><>+<2B>7 for "BUSY"
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For sendpage to work, it must be able to access the modem. This requires read
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/write permissions to the modem device. On my system, sendpage is run with
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set-uid to the username "sendpage". In my /etc/group file, I have a group
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called "modem" of which the user "sendpage" is a member. The device file for
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my modem (/dev/ttyS1) is owned by user "root" and group "modem". It is
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readable and writeable by both the owner and the group (chown root.modem /dev
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/cua1 ; chmod ug+w /dev/cua1).
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SENDPAGE MAKEFILE SETUP
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Here are the build options I use for Linux:
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<EFBFBD><EFBFBD>*<2A>CC = gcc
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<EFBFBD><EFBFBD>*<2A>CFLAGS = -DLINUX -O2 -m486 -I/usr/include
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<EFBFBD><EFBFBD>*<2A>LIBS = -ldb -lbsd
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*** If you are interested, Makefile is available in it's entirety at the
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following ftp site:ftp://ftp.cs.unm.edu/pub/chris/paging/sendpage/
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Makefile.example".
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CONTINUING THE SETUP
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Hopefully, you were able to get sendpage to compile correctly on the first
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try. Now you must set up sendpage for the initial testing. Following the
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INSTALL file's instructions, you will set up the queue directory and begin
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setting up the sendpage.cf file (I keep mine in /etc).
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A few notes on setting up the /etc/sendpage.cf:
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<EFBFBD><EFBFBD>*<2A>I had to comment out (using "#") the entire trMap section for "both",
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leaving only the trMap section for "std" in order to get sendpage to
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work.
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<EFBFBD><EFBFBD>*<2A>My "Global Options" section looks like:
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<20><>+<2B>global maxMsgSize=480 maxMsgSplit=5 syslogFacility=LOG_MAIL\
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<20><>+<2B>timeFormat=dayFirst replyToSender=no\
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<20><>+<2B>emailFrom="sendpage@e-expertsoft.com (UNM Pager Gateway)"
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<EFBFBD><EFBFBD>*<2A>My "Paging Central Definition" section looks like:
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<20><>+<2B>pc name=RPGPaging phone=9632567892 speed=1200 parity=even\
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<20><>+<2B>databits=7 stopbits=1 protocol=pet-pg1 msgretries=10\
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<20><>+<2B>answertime=25 modemdial=atdt dialer=internal\
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<20><>+<2B>modeminit=atevxh modemdev=/dev/ttyS1trMap=std\
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<20><>+<2B>emailFrom="sendpage@e-expertsoft.com (UNM Pager Gateway)"
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<EFBFBD><EFBFBD>*<2A>Here is my "Aliases" section. The 'tanmoyauto' definition does not send
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an e-mail reply when a page is sent and is used for hourly system stats
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that are sent to my page.
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<20><>+<2B>alias tanmoy 9632137604.RPGPaging trMap=std
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<20><>+<2B>alias tanmoyauto 9632137604.RPGPaging emailReply=no msgIncTime=yes
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trMap=std
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<20><>+<2B>alias expert 9632137690.RPGPaging trMap=std
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<EFBFBD><EFBFBD>*<2A>And finally, the "Profile" section:
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<20><>+<2B>profile default emailReplyErr=yes emailReply=yes msgIncSender=yes\
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msgIncDate=yes msgIncTime=yes
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<20><>+<2B>profile numeric emailReplyErr=yes emailReply=yes msgIncSender=no\
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msgIncDate=no msgIncTime=no
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<20><>+<2B>set profile=default.
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*** If you are interested, the sendpage.cf is available in it's entirety from
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the following ftp site:ftp://ftp.cs.unm.edu/pub/chris/paging/sendpage/
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sendpage.cf.example".
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MOVING RIGHT ALONG...
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At this point, I am assuming you have been able to at least send a page to
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your pager using sendpage's command-line interface. If you haven't been able
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to do this, re-read the INSTALL file and re-check your sendpage.h and
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sendpage.cf. If all else fails, do mail me.
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SETTING UP A SPECIAL HOSTNAME
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If you want to have a special virtual hostname for your paging gateway (i.e.
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pager.yourcompany.com), there are a few steps that you will need to follow.
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If you do not want to (or cannot) set up an extra virtual hostname, skip
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ahead to the section entitled "SETTING UP /etc/aliases".
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Setting up a separate UP address (as described below) is not necessary if all
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you need is a mail->pager gateway [no www]. If this is all you need, follow
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the instructions found at: ftp://ftp.cs.unm.edu/pub/chris/paging/
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Sendmail-and-virtual-domains.txtto set up a MX entry for your paging
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hostname. When you've done this, skip ahead to the "SETTING UP SENDMAIL"
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section.
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The first thing you need to do to set up your new hostname is to ask your
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network administrator to add a new IP address and hostname to the DNS tables.
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I would recommend using the hostname "pager" but it really doesn't matter.
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Now that you have your new address and the associated IP number, you need to
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add it to your machine. This will be done in one of two ways, depending on
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the type of your linux distribution.
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If you use the Linux kernel 1.2.xx series. Get the IP aliasing patches from:
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ftp://ftp.cs.unm.edu/pub/chris/paging/ip_alias and follow the instructions in
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the file README.alias, substituting your newly-assigned IP address and
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gateway address for the ones mentioned in this README file.
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* If you are using Linux kernel 2.0.xx and above, Enable the following
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options for your kernel and recompile: Network aliasing IP: aliasing support.
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In your startup scripts (/etc/rc.d/rc.inet1 for Slackware users, /etc/
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sysconfig/network-scripts/ifup-eth for RedHat users) add the following lines:
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<EFBFBD><EFBFBD>*<2A>ifconfig eth0:0 191.59.16.224
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<EFBFBD><EFBFBD>*<2A>route add -host 191.59.16.224 dev eth0:0
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<EFBFBD><EFBFBD>*<2A>replacing 191.59.16.224 with your new IP address
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SETTING UP SENDMAIL
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We need to make some aliases so that sendmail can distinguish between a
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message sent to you@somemachine.dink.com and you@pager.dink.com, when
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"somemachine" and "pager" are actually the same machine. To do this, we need
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to set up a sendmail alias database. The following information is based upon
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the info I got from Sendmail Link .
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*** Create a file, /etc/domainalias with translations from the pager hostname
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to the "real" hostname. On my machine (mahavir), my translation file looks
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like this: <tanmoy@pager.com> <esc-pager@mahavir.esc>.<intest@pager.com> <
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guest-pager@mahavir.esc.in>. That's it for that file. We are almost done now.
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I hope you have a sendmail binary that was compiled with the following
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switches: -DNDBM -DNEWDB. These are to enable the database-handling code
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needed to read the domainalias.db file that we are about to create.
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Make sure that you have the makemap utility (part of the sendmail
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distribution). Compile it like this if you haven't already: (This may not be
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necessary, check to see if hash, dbm, or btree are supported or not, check
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next step on how to do this. )
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<EFBFBD><EFBFBD>*<2A># cd /usr/src/sendmail-8.7.x/makemap
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<EFBFBD><EFBFBD>*<2A># rm Makefile makemap
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<EFBFBD><EFBFBD>*<2A># make CFLAGS='-m486 -O2 -I../src -DNDBM -DNEWDB' LDFLAGS='-s
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<EFBFBD><EFBFBD>*<2A>-lgdbm -ldb' makemap
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<EFBFBD><EFBFBD>*<2A># cp makemap /usr/bin
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Add a line to your /etc/sendmail.cf to make sendmail accept mail for the new
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virtual hostname: Cw pager.yourdomain.com Compile /etc/domainaliases into a
|
||
database format: makemap btree domainaliases.db < domainalisaes
|
||
|
||
Add another line to your /etc/sendmail.cf to tell sendmail about the
|
||
domainaliases.db translation file which we just compiled. Kdomainaliases
|
||
btree/etc/domainaliases.db . Now for the rule-set, make sure you type it
|
||
exactly into/etc/sendmail.cf..
|
||
|
||
The entries are separated by a TAB field NOT SPACES!!!! These are to be
|
||
inserted INSIDE the S98 Ruleset.
|
||
|
||
PRE 8.7.1 R$+ < @ $+ . > $: $1 < @ $2 > . R$+ < @ $+ . > $* $: (domainaliases
|
||
$1@$2 $: $1 < @ $2 > $3 $) R$+ < @ $+ . > $* $: (domainaliases $2 $: $1 < @
|
||
$2 > $3 $) R$+ < @ $+ > . $: $1 < @ $2 . >
|
||
|
||
POST 8.7.1 R$+< $+. > $1< $2 > R$+< $+ > $: < > $(domainaliases $1$2 $) R< >
|
||
$+ @ $* $: < $1 > $(domainaliases * @ $2 $) R< $+ > * $* $: < > $1 $2 R< > $*
|
||
$: $>3 $1
|
||
|
||
Now you must kill your sendmail daemon and restart it for the new
|
||
configurations to take effect.
|
||
|
||
<EFBFBD><EFBFBD>*<2A>/sbin/killall sendmail
|
||
|
||
<EFBFBD><EFBFBD>*<2A>sendmail -bd -q15m
|
||
|
||
|
||
Finally, test your new configuration to make sure you did it correctly, Check
|
||
/var/log/maillog for any possible error messages.
|
||
|
||
<EFBFBD><EFBFBD>*<2A>sevak~> sendmail -bt
|
||
|
||
<EFBFBD><EFBFBD>*<2A>ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
|
||
|
||
|
||
Enter <Ruleset> <Address> >0 tanmoy@PAGER.com
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 0 input: tanmoy @ pager . com
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 98 input: tanmoy @ pager . com
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 98 returns: tanmoy @ pager . com
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 97 input: tanmoy @ pager . com
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 3 input: tanmoy @ pager . com
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 96 input: tanmoy < @ pager . com>
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 96 returns: tanmoy < @ pager . com. >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 3 returns: tanmoy < @ pager . com. >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 0 input: tanmoy < @ pager . com. >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 98 input: tanmoy < @ pager . com. >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 3 input: esc-pager @ sevak . esc . in
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 96 input: esc-pager < @ sevak .esc . in >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 96 returns: esc-pager < @ sevak . esc . in . >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 3 returns: esc-pager < @ sevak . esc. in . >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 98 returns: esc-pager < @ sevak . esc .in . >
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 0 returns: $# local $: @ esc-pager
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 97 returns: $# local $: @ esc-pager
|
||
|
||
<EFBFBD><EFBFBD>*<2A>rewrite: ruleset 0 returns: $# local $: @ esc-pager
|
||
|
||
|
||
*** If this didn't work or you just don't understand, consult your local
|
||
sendmail expert.
|
||
|
||
SETTING UP /etc/aliases
|
||
|
||
Now you need to set up your /etc/aliases file to handle the piping of the
|
||
e-mail message to the filter which sends the message to sendpage. In the
|
||
previous section, I demonstrated how I made tanmoy@pager.com point to
|
||
pager@mahavir.esc.in. To make this work, I had to add a line to my /etc/
|
||
aliases file to send all mail to esc-pager to the filter. That line is:
|
||
esc-pager: "|/usr/local/bin/sendpagefilter tanmoy"^^^^^^^^^ ^^^^^^^^^^^^^^^^^
|
||
^^^^^^^^^^^^ ^^^^^This is the This is the full path to the This is a username
|
||
thatalias that paging filter. (see below) you defined in youryou created
|
||
sendpage.cf
|
||
|
||
The filter used in this example can be obtained at: ftp://ftp.cs.unm.edu/pub/
|
||
chris/paging/paging_filter.tar.gz. Read the instructions in the included
|
||
README file, compile the filter, and place it in a directory such as /usr/
|
||
local/bin.You must now run the 'newaliases' command to make sendmail re-read
|
||
/etc/aliases for the current configurations to take effect.With this
|
||
complete, your paging gateway should be working. Try sending mail first to
|
||
the alias which you created in /etc/aliases (in my example, esc-pager). If
|
||
this works, try sending mail to your virtual mail alias which you created in
|
||
the previous section (in my example, tanmoy@pager.com). If this works, you
|
||
are done!!!
|
||
|
||
THE WWW GATEWAY
|
||
|
||
I am not going to write much here. I'm assuming that you have some HTML
|
||
skills and have used CGI scripts before. Your gateway will use a CGI script
|
||
to communicate between the web browser and the sendpage program. An example
|
||
script and HTML page available at: URL="ftp://ftp.cs.unm.edu/pub/chris/paging
|
||
/example_www_gateway.tar.gz".
|
||
|
||
This script utilizes two additional programs, uncgi (to translate CGI data
|
||
into shell environment variables for easy CGI programming) and d2utxt to
|
||
strip out the ^M characters in a page message that make sendpage choke. These
|
||
utilities are available in the same directory on the ftp site that the
|
||
example HTML is found in. Read the instructions that come with them to
|
||
compile them. This should be easy.
|
||
|
||
If you are using Apache web server then visit URL=" http://www.apache.org" or
|
||
refer to WWW-HOWTO for more information to set the web server. In CGI script,
|
||
i.e., in send_a_page file make appropriate changes in the modem number of
|
||
your Paging Central and your Pager number.
|
||
|
||
GETTING MORE HELP
|
||
|
||
You can mail me at <Lilytanmoy@id.eth.net>. Though I'm a busy employee but
|
||
still you can ask for help. I hope i will be able to solve your problem.
|
||
Still I cannot guarantee to solve your problem.
|
||
|
||
Tanmoy<EFBFBD>Prasad<Lilytanmoy@id.eth.net>
|
||
Expert Software Consultants Ltd.
|
||
C -17 Almora Bhawan
|
||
New Delhi
|
||
110 049
|
||
INDIA
|