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<!-- Created: Sun Dec 13 20:25:14 GMT 1998 -->
<!-- hhmts start -->
-Last modified: Fri Jan 8 14:27:18 GMT 1999
+Last modified: Sun Sep 2 20:44:59 BST 2001
<!-- hhmts end -->
<p>At the moment, anybody can connect inwards at any time from outside, either by ax25 or by
telnet (assuming you have followed the instructions in <a href="install.html">installation</a>
<p><em>Connect</em> scripts live in the <tt>/spider/connect</tt> directory and are simple ascii scripts
that are written using a normal editor. There are a couple of examples in the issue directory.
-
- <p>Here are a few of basic types, first a telnet connection where the
- client is set up in the passwd file thus:-
- <pre>
- gb7djk:x:1372:1291::/home/gb7djk:/usr/bin/perl /spider/perl/client.pl gb7djk telnet
- </pre>
- and the connect script would be:-
+
+ <p>The first example is a simple telnet (TCP/IP) connect to port 7000 of WR3D (this will actually
+ work if you have or make an arrangement to connect to WR3D)[oh, and substitute x1xxx for your real
+ node callsign.</p>
+
<pre>
timeout 15
# this is a comment
- connect telnet dirkl.tobit.co.uk
- 'login' 'gb7djk'
- 'word' 'gb7djk'
- client gb7djk telnet
+ connect telnet wr3d.dxcluster.net 7000
+ 'login' 'x1xxx'
+ client wr3d telnet
</pre>
+
<p>For a connect that requires a login and execution of the programs
- from a normal shell, do:-
+ from a normal shell, do:-</p>
<pre>
timeout 15
# confuse whole networks for hours!
'\$' 'stty -echo raw'
# tell GB7DJK that you are GB7DJK-1
- '\$' 'client.pl gb7djk-1 telnet'
+ '\$' '/spider/src/client gb7djk-1 telnet'
# tell GB7DJK-1 that it is connected to GB7DJK
# you can leave this out if you call this script 'gb7djk'
client gb7djk telnet
</pre>
- <p>and finally an ax25 example:-
+ <p>a ax25 example (connecting from GB7DJK, to GB7DXM via my local BPQ node and one X1J intermediate node):-
<pre>
timeout 60
abort (Busy|Sorry|Fail)
# don't forget to chmod 4775 netrom_call!
- connect ax25 /usr/sbin/netrom_call bbs gb7djk g1tlh
+ connect ax25 /usr/sbin/netrom_call bbs gb7djk-0 g1tlh-0
+ 'Connected' ''
+ 'Connected' 'c np7'
+ '*** Connect' 'c gb7dxm'
'Connect' ''
- 'Connect' 'c np7'
- 'Connect' 'c gb7dxm'
+ </pre>
+
+ <p>The <tt>-0</tt> ssid is important if you want it to work reliably. Obviously if you are
+ using a different ssid then you would use that. You can use the Netrom alias instead if it
+ it is in the machines node table</p>
+
+ <p>A AGW Engine example would be very similar and look like this:-</p>
+
+ <pre>
+ timeout 60
+ abort (Busy|Sorry|Fail)
+ connect agw 2 g1tlh
+ '*** Connected' ''
+ '*** Connect' 'c np7'
+ 'linked to' 'c gb7dxm'
'Connect' ''
- # you can leave this out if you call the script 'gb7dxm'
- client gb7dxm ax25
</pre>
- <p>A connection is started manually by typing in <tt>connect <scriptname></tt> on a sysop enabled
- <tt>client.pl</tt> session. For example:-
+ <p>A connection is started manually by typing in <tt>connect <scriptname></tt> on a sysop enabled
+ <tt>client.pl</tt> session. For example:-</p>
+
<pre>
G1TLH de GB7DJK 13-Dec-1998 2041Z > connect gb7djk-1
connection to GB7DJK-1 started
G1TLH de GB7DJK 13-Dec-1998 2043Z >
</pre>
- <p>You can watch the progress of the connection (if you have the standard debugging enabled) on the
- <tt>cluster.pl</tt> screen and you should see something like this:-
+ <p>Consider the following specific example, it is located in the file <tt>/spider/connect/gb7djk-1</tt> :-</p>
+
+ <pre>
+ <span class=cmd>timeout 15</span>
+ <span class=cmd>connect telnet dirkl.tobit.co.uk</span>
+ <span class=expect>'login'</span> <span class=send>'gb7djk'</span>
+ <span class=expect>'ssword'</span> <span class=send>'gb7djk'</span>
+ </pre>
+
+ <p>You can watch the progress of the connection (if you have <tt>connect</tt>
+ debugging enabled [<tt>set/debug connect</tt>]) on the
+ <tt>cluster.pl</tt> screen and you should see something like this:-</p>
+
<pre>
<- D G1TLH connect gb7djk-1
-> D G1TLH connection to GB7DJK-1 started
-> D G1TLH G1TLH de GB7DJK 13-Dec-1998 2046Z >
- timeout set to 15
- CONNECT sort: telnet command: dirkl.tobit.co.uk
+ <span class=cmd>timeout set to 15</span>
+ <span class=cmd>CONNECT sort: telnet command: dirkl.tobit.co.uk</span>
CHAT "login" -> "gb7djk"
received "
Red Hat Linux release 5.1 (Manhattan)
Kernel 2.0.35 on an i586
"
- received "login: "
- sent "gb7djk"
+ <span class=expect>received "login: "</span>
+ <span class=send>sent "gb7djk"</span>
CHAT "word" -> "gb7djk"
received "gb7djk
"
- received "Password: "
- sent "gb7djk"
+ <span class=expect>received "Password: "</span>
+ <span class=send>sent "gb7djk"</span>
Connected to GB7DJK-1, starting normal protocol
<- O GB7DJK-1 telnet
-> B GB7DJK-1 0
<- D GB7DJK-1 PC18^ 1 nodes, 0 local / 1 total users Max users 0 Uptime 0 00:00^5447^~
etc
</pre>
-
+
+ <p>I have coloured the commands in an attempt to make it clear as to what goes on, where and why.
+ <span class=cmd>These coloured lines are miscellaneous commands</span>, the <span class=expect>things
+ that are this colour are the strings I am looking for (what I am "expecting")</span>
+ and the <span class=send>things that are this colour
+ are the commands I am going to send when I see the "expect" strings in the input</span>.</p>
+
+ <p>The script starts by setting the timeout to 15 seconds, then starts
+ the connection. It is <b>important</b> to note that, in the case of
+ an ax25 connection (usually) this will be the callsign of the <i>first hop</i> along the
+ route that you are going to take to the destination, so this will be typically the callsign
+ of your local node.</p>
+
+ <p>You will notice that the script waits until it sees the left hand string
+ of the pair and <b>only then</b> does it send the,
+ string on the right
+ hand side. This is called a <i>State Machine</i>.</p>
+
+ <p>A <i>state machine</i> "walks" through a conversation (in this case) looking
+ for "states" (in this case particular strings) and then performs some
+ "action" (usually some kind of connect command for the type of system
+ you are trying to navigate). When one "state" "fires" (detects the string
+ are looking for), it sends the command associated with that state and then
+ moves onto the next "state", in our case: the next line.</p>
+
+ <p><b>PLEASE NOTE</b>: the colouration in the above example is for illustrative purposes
+ only, the debug output is all one colour.</p>
+
<p>The connect scripts consist of lines which start with the
- following keywords or symbols:-
+ following keywords or symbols:-</p>
<ul>
- <p><li><b>#</b> All lines starting with a <b>#</b> are
+ <li><b>#</b> All lines starting with a <b>#</b> are
ignored, as are wholly blank lines.
+ <br><br>
- <p><li><b>timeout</b> followed by a number is the number of
+ <li><b>timeout</b> followed by a number is the number of
seconds to wait for a command to complete. If there is no
<b>timeout</b> specified in the script then the default is 60
seconds.
+ <br><br>
- <P><li><b>abort</b> is a regular expression containing one or
+ <li><b>abort</b> is a regular expression containing one or
more strings to look for to abort a connection. This is a perl
regular expression and is executed ignoring case.
+ <br><br>
- <p><li><b>connect</b> followed by <b>ax25</b> or <b>telnet</b>
- and some type dependent information. In the case of a
+ <li><b>connect</b> followed by <b>ax25</b>, <b>telnet</b> or <b>agw</b>
+ and some type dependent information.
+
+ <p>In the case of a
<b>telnet</b> connection, there can be up to two parameters,
the first is the ip address or hostname of the computer you
wish to connect to and the second is the port number you want
session).
<p>In the case of an <b>ax25</b> session then this would
- normally be a call to <tt>ax25_call</tt> or
- <tt>netrom_call</tt> as in the example above. It is your
+ normally be a call to <tt>/usr/sbin/ax25_call</tt> or
+ <tt>/usr/sbin/netrom_call</tt> as in the example above. It is your
responsibility to get your node and other ax25 parameters to
work before going down this route!
- <p><li><b>'</b> is the delimiting character for a word or
+ <p>For <b>agw</b> connections you will need a port number (starting
+ from 1) and the callsign of the first "hop" along the way.
+ <br><br>
+
+ <li><b>'</b> is the delimiting character for a word or
phrase of an expect/send line in a <tt>chat</tt> type
script. The words/phrases normally come in pairs, either can
be empty. Each line reads input from the connection until it
it is) then the right hand string is sent to the connection.
<p>This process is repeated for every line of <tt>chat</tt> script.
+ <br><br>
- <p><li><b>client</b> starts the connection, put the arguments
+ <li><b>client</b> starts the connection, put the arguments
you would want here if you were starting the client program
manually. You only need this if the script has a different
name to the callsign you are trying to connect to (i.e. you
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<p> </p>
- <p>
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- <font color="#FF0000" size=-2>
- Copyright © 1998 by Dirk Koopman G1TLH. All Rights Reserved<br>
- </font>
- <font color="#000000" size=-2>$Id$</font>
+ <hr>
+ <span class=copy>Copyright © 1998 by Dirk Koopman G1TLH. All Rights Reserved</span><br>
+ <span class=id>$Id$</span>
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