#!/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