call back

[Eelco van Asperen]

in article <301 at eurtrx.UUCP>, evas at eurtrx.UUCP (Eelco van Asperen) says:
> 
> If your machine has 'cu' (call Unix), then it's simple; I've got a 
> small script that looks up users in a callback-database, locates a 
> free dialer and starts the dial-back. Shout if you want it.
> 

Since I made this offer, my mailbox has been flooded with requests for
this script so I've decided to post it. I don't consider this a very 
elegant script but then it does what it's supposed to do.

Eelco van Asperen.		
-------------------------------------------------------------------------
uucp:        evas at eurtrx / mcvax!eurtrx!evas	#include <inews/filler.h>
earn/bitnet: asperen at hroeur5			#include <stdjunk.h>
-------------------------------------------------------------------------

# This is a shar archive.  Extract with sh, not csh.
# This archive ends with exit, so do not worry about trailing junk.
# --------------------------- cut here --------------------------
PATH=/bin:/usr/bin
echo Extracting callback
sed 's/^X//' > callback << '+ END-OF-FILE 'callback
X#! /bin/sh
X#
X# callback -- a call-back facility for aiv-staff members.
X#
X# usage:	callback [baud [waittime] ]
X#
X# v1 03-10-86  Eelco van Asperen
X# v2 06-07-88  Cleaning-up
X#
X# this is the file where user/telno data are stored:
X#
XCALLDBS="/usr2/aiv/admi/callback.dbs"
X#
X# first get callers name:
X#
XHISNAME=`who am i | cut -f1 -d" " -s`
X#
X# now see if he/she is in the callback-database:
X#
XHISENTRY=`grep ^$HISNAME: $CALLDBS`
XPHONENUM=`echo $HISENTRY | cut -d":" -f2 -s`
X#
Xif [ -z "$PHONENUM" ]
Xthen
X	echo "Your name is not in the call-back database; contact your sysop."
X	exit 1
Xelse
X	echo "Your phone-number: "$PHONENUM
Xfi
Xif [ -n "$1" ]
Xthen
X	BAUD=$1
Xelse
X	BAUD=`echo $HISENTRY | cut -d":" -f3 -s`
Xfi
Xif [ -z "$BAUD" ]
Xthen
X	# system default baudrate:
X	BAUD=1200
Xfi
XWAIT=15
Xif [ "$2" != "" ]
Xthen 
X	#
X	# how long should 'cu' wait for a free dialer ?
X	# (in minutes)
X	#
X	WAIT=$2
Xfi
X#
X# Parse the /usr/lib/uucp/Devices-file to find list of dialers;
X#
XTMPFILE=/tmp/cback.$$
Xtrap 'rm $TMPFILE' 0 1 15 
XDEBUG=9
X
Xawk -F" " '
XBEGIN	{ dialers=""; 
X	  speeds="";
X	}
X/^ACU/	{ if ($4 == reqspeed)
X		dialers = dialers " " $2;
X	  else	if (speeds == "" || index(speeds,$4) == 0) {
X			speeds = speeds " " $4;
X		}
X	}
XEND	{ if (dialers == "") {
X		print "echo \"Sorry, there are no dialers at",reqspeed,\
X			"baud available on this system.\"";
X		print "echo \"Dialers are available at the following speeds:\""
X		print "echo \"	",speeds,"\""
X		print "exit 1";
X	  }
X	  else {
X		print	"for i in",dialers
X		print	"do"
X		print	"	if [ ! -f /usr/spool/locks/LCK..$i ]"
X		print	"	then"
X		print	"		echo \"Found free dialer $i\""
X		print	"		exit 0\n"\
X			"	fi\n";
X		print	"done"
X
X		print	"echo \"Sorry, all dialers are currently locked\"";
X		print	"echo \"Start callback anyway (y,n) ? \\c\"";
X		print	"read answer";
X		print	"if [ \"$answer\" != \"y\" ]";
X		print	"then";
X		print	"	exit 1";
X		print	"fi";
X		print	"exit 0";
X	  }
X	}
X' reqspeed=$BAUD /usr/lib/uucp/Devices >$TMPFILE
X
Xsh $TMPFILE
Xif [ $? != 0 ]
Xthen
X	exit 1
Xfi
Xtrap "" 0 1 15 
Xrm -f $TMPFILE
X#
X# start dialing:
X#
X(nohup ct -w${WAIT} -s${BAUD} -x${DEBUG} 0-${PHONENUM})&
Xecho "Dial-back started..."
Xexit 0
+ END-OF-FILE callback
chmod 'u=rwx,g=rx,o=rx' callback
set `sum callback`
sum=$1
case $sum in
28879)	:;;
*)	echo 'Bad sum in 'callback >&2
esac
echo Extracting callback.dbs
sed 's/^X//' > callback.dbs << '+ END-OF-FILE 'callback.dbs
X#
X# format:
X#	loginname:phonenumber[:baudrate]
X#
Xevas:01234-87654:1200
Xdumbuser:123456
+ END-OF-FILE callback.dbs
chmod 'u=rw,g=r,o=' callback.dbs
set `sum callback.dbs`
sum=$1
case $sum in
6774)	:;;
*)	echo 'Bad sum in 'callback.dbs >&2
esac
exit 0