Sophisticated ppp-on Script With chat Options

#!/bin/sh
#
# ppp-on -- start a PPP session, with any other necessary actions

# exit status
sts=0

# setup default script location and file extensions
if [ -z $ppppth ]; then
# note: don't quote ppppth; otherwise shell expansions
# may not work quite right.
ppppth=~/.ppp
fi
if [ -z $diaxtn ]; then
diaxtn="chat"
fi
if [ -z $pppxtn ]; then
pppxtn="ppp"
fi

# help function
function prthlp()
{
echo ""
echo "usage: $0 [-v] [-c] [<name-to-dial>]"
echo ""
echo "open ppp link. if <name-to-dial> is specified, use a 'chat' script"
echo "called $ppppth/<name-to-dial>.$diaxtn to make the dialup "
echo "connection; otherwise, we expect the dialup connection to already "
echo "be made. see chat(1) for format of chat scripts."
echo ""
echo "options:"
echo "-v verbose operation; logs chat to system log."
echo "-c connect script; perform script after ppp connected. "
echo " if <name-to-dial> is specified, perform "
echo " $ppppth/<name-to-dial>.$pppxtn, otherwise"
echo " perform $ppppth/default.$pppxtn."
echo ""
}

# option defaults
# -v => verbose chat operation
opt_vrbopr=""
# yes => perform connect script
opt_scpflg="no"

# various options
for i in $*; do
case $i in
-v | --verbose)
opt_vrbopr="-v"
shift
;;
-c | --connect)
opt_scpflg="yes"
shift
;;
-h | --help)
prthlp
exit 0
;;
*) break
;;
esac
done

# if this script is run with an argument, use that
# as the basename for the dialing and connect scripts;
# otherwise, use default values.
if [ -z $1 ]; then
diaflg="no"
diacmd=""
cnnscp="$ppppth/default.$pppxtn"
else
diaflg="yes"
diascp="$ppppth/$1.$diaxtn"
diacmd="chat $opt_vrbopr -f $diascp"
cnnscp="$ppppth/$1.$pppxtn"
fi

# delay to allow for connection
cnndly="5s"

# connection device and speed
pppdev=/dev/modem
pppspd=38400

# this is the command we use to start the ppp daemon
pppcmd="pppd $pppdev $pppspd"

# this function starts up ppp
function pppstu()
{
if $pppcmd; then
# sleep for a little bit to give ppp time to connect
sleep $cnndly
echo "ppp connected."
if [ $opt_scpflg = "yes" ]; then
(
# perform user- or connection-specific actions
# upon successful ppp connection
if [ -x $cnnscp ]; then
sleep $cnndly
$cnnscp
fi
) &
fi
else
echo "error: ppp not connected."
sts=1
fi
}

# dial if requested and then start pppd
echo "opening ppp connection over $pppdev ... "
if [ "$diaflg" = "yes" ]; then
# we're dialing first, then starting ppp
echo -n "dialing $1 ... "
if $diacmd <$pppdev >$pppdev; then
echo "connected."
pppstu
else
echo -e "\nerror: dialing failed."
sts=1
fi
else
# we're not dialing; just start ppp
pppstu
fi

exit $sts

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