#!/bin/sh
# @configure_input@
#***********************************************************************
#
# adsl-connect
#
# Shell script to connect to an ADSL provider using PPPoE
#
# Copyright (C) 2000 Roaring Penguin Software Inc.
#
# $Id$
#
# This file may be distributed under the terms of the GNU General
# Public License.
#
# Usage: adsl-connect [config_file]
#        adsl-connect interface user [config_file]
# Second form overrides USER and ETH from config file.
# If config_file is omitted, defaults to /etc//ppp/pppoe.conf
#
#***********************************************************************

# From AUTOCONF
prefix=@prefix@
exec_prefix=@exec_prefix@
localstatedir=/var

# Paths to programs
IFCONFIG=/sbin/ifconfig
PPPD=@PPPD@
SETSID=@SETSID@
PPPOE=@sbindir@/pppoe
LOGGER="/usr/bin/logger -t `basename $0`"

# Must be root
if test "`@ID@ -u`" != 0 ; then
    echo "$0: You must be root to run this script" >& 2
    exit 1
fi

if test "$SETSID" != "" -a ! -x "$SETSID"; then
    SETSID=""
fi

CONFIG=/etc//ppp/pppoe.conf
USER=""
ETH=""

# Sort out command-line arguments
case "$#" in
    1)
	CONFIG="$1"
	;;
    3)
	CONFIG="$3"
	;;
esac

if test ! -f "$CONFIG" -o ! -r "$CONFIG" ; then
    echo "$0: Cannot read configuration file '$CONFIG'" >& 2
    exit 1
fi

. $CONFIG

PPPOE_PIDFILE="$PIDFILE.pppoe"
PPPD_PIDFILE="$PIDFILE.pppd"

# Check for command-line overriding of ETH and USER
case "$#" in
    2|3)
	ETH="$1"
	USER="$2"
	;;
esac

# Check that config file is sane
if test "$USER" = "" ; then
    echo "$0: Check '$CONFIG' -- no setting for USER" >& 2
    exit 1
fi
if test "$ETH" = "" ; then
    echo "$0: Check '$CONFIG' -- no setting for ETH" >& 2
    exit 1
fi

PPPD_PID=0

# Catch common error
if test "$DEBUG" = "1" ; then
    echo "*** If you want to use DEBUG, invoke adsl-start, not adsl-connect."
    exit 1
fi

if test "$DEBUG" != "" ; then
    if test "$LINUX_PLUGIN" != "" ; then
	echo "Cannot use DEBUG mode and LINUX_PLUGIN at the same time."
	echo "Kernel-mode PPPoE is experimental and unsupported."
	exit 1
    fi
    echo "* The following section identifies your Ethernet interface" >> $DEBUG
    echo "* and user name.  Some ISP's need 'username'; others" >> $DEBUG
    echo "* need 'username@isp.com'.  Try both" >> $DEBUG
    echo "ETH=$ETH; USER=$USER" >> $DEBUG
    echo "---------------------------------------------" >> $DEBUG
fi

# MTU of Ethernet card attached to modem MUST be 1500.  This apparently
# fails on some *BSD's, so we'll only do it under Linux

if test `uname -s` = Linux ; then
    $IFCONFIG $ETH up mtu 1500
    # For 2.4 kernels.  Will fail on 2.2.x, but who cares?
    modprobe ppp_generic > /dev/null 2>&1
    modprobe ppp_async > /dev/null 2>&1
    modprobe ppp_synctty > /dev/null 2>&1
    if test -n "$LINUX_PLUGIN" ; then
	modprobe pppox > /dev/null 2>&1
	modprobe pppoe > /dev/null 2>&1
    fi
fi

if test "$SYNCHRONOUS" = "yes" ; then
	PPPOE_SYNC=-s
	PPPD_SYNC=sync
	# Increase the chances of it working on Linux...
	if test `uname -s` = Linux ; then
	    modprobe n_hdlc > /dev/null 2>&1
	fi
else
	PPPOE_SYNC=""
	PPPD_SYNC=""
fi

if test -n "$ACNAME" ; then
    ACNAME="-C $ACNAME"
fi

if test -n "$SERVICENAME" ; then
    SERVICENAME="-S $SERVICENAME"
fi

if test "$CLAMPMSS" = "no" ; then
	CLAMPMSS=""
else
	CLAMPMSS="-m $CLAMPMSS"
fi

# If DNSTYPE is SERVER, we must use "usepeerdns" option to pppd.
if test "$DNSTYPE" = "SERVER" ; then
	USEPEERDNS=yes
fi

if test "$USEPEERDNS" = "yes" ; then
	USEPEERDNS="usepeerdns"
else
	USEPEERDNS=""
fi

# Backward config file compatibility
if test "$DEMAND" = "" ; then
	DEMAND=no
fi

if test "$DEMAND" = "no" ; then
	DEMAND=""
else
	DEMAND="demand persist idle $DEMAND 10.112.112.112:10.112.112.113 ipcp-accept-remote ipcp-accept-local connect true noipdefault ktune"
fi

case "$FIREWALL" in
    STANDALONE)
	. /etc/ppp/firewall-standalone
	;;
    MASQUERADE)
	. /etc/ppp/firewall-masq
	;;
esac

# If we're using kernel-mode PPPoE on Linux...
if test "$LINUX_PLUGIN" != "" ; then
    PLUGIN_OPTS="plugin $LINUX_PLUGIN $ETH"
    modprobe pppoe > /dev/null 2>&1
fi

# Standard PPP options we always use
PPP_STD_OPTIONS="$PLUGIN_OPTS noipdefault noauth default-asyncmap defaultroute hide-password nodetach $USEPEERDNS local mtu 1492 mru 1492 noaccomp noccp nobsdcomp nodeflate nopcomp novj novjccomp user $USER lcp-echo-interval $LCP_INTERVAL lcp-echo-failure $LCP_FAILURE $PPPD_EXTRA"

# Jigger DNS if required...
if test "$DNSTYPE" = "SERVER" ; then
    # Sorry, dude...
    rm -f /etc/resolv.conf
    ln -s /etc/ppp/resolv.conf /etc/resolv.conf
elif test "$DNSTYPE" = "SPECIFY" ; then
    # Sorry, dude...
    rm -f /etc/resolv.conf
    echo "nameserver $DNS1" > /etc/resolv.conf
    if test -n "$DNS2" ; then
	echo "nameserver $DNS2" >> /etc/resolv.conf
    fi
fi

# PPPoE invocation
PPPOE_CMD="$PPPOE -p $PPPOE_PIDFILE -I $ETH -T $PPPOE_TIMEOUT -U $PPPOE_SYNC $CLAMPMSS $ACNAME $SERVICENAME $PPPOE_EXTRA"
if test "$DEBUG" != "" ; then
    if test "$DEMAND" != "" ; then
	echo "(Turning off DEMAND for debugging purposes)"
	DEMAND=""
    fi
    echo "* The following section shows the pppd command we will invoke" >> $DEBUG
    echo "pppd invocation" >> $DEBUG
    echo "$SETSID $PPPD pty '$PPPOE_CMD' $PPP_STD_OPTIONS $PPPD_SYNC debug" >> $DEBUG
    echo "---------------------------------------------" >> $DEBUG
    $SETSID $PPPD pty "$PPPOE_CMD -D $DEBUG-0" \
	$PPP_STD_OPTIONS \
	$PPPD_SYNC \
	debug >> $DEBUG 2>&1
    echo "---------------------------------------------" >> $DEBUG
    echo "* The following section is an extract from your log." >> $DEBUG
    echo "* Look for error messages from pppd, such as" >> $DEBUG
    echo "* a lack of kernel support for PPP, authentication failure" >> $DEBUG
    echo "* etc." >> $DEBUG
    echo "Extract from /var/log/messages" >> $DEBUG
    grep 'ppp' /var/log/messages | tail -150 >> $DEBUG
    date >> $DEBUG
    echo "---------------------------------------------" >> $DEBUG
    echo "* The following section is a dump of the packets" >> $DEBUG
    echo "* sent and received by rp-pppoe.  If you don't see" >> $DEBUG
    echo "* any output, it's an Ethernet driver problem.  If you only" >> $DEBUG
    echo "* see three PADI packets and nothing else, check your cables" >> $DEBUG
    echo "* and modem.  Make sure the modem lights flash when you try" >> $DEBUG
    echo "* to connect.  Check that your Ethernet card is in" >> $DEBUG
    echo "* half-duplex, 10Mb/s mode.  If all else fails," >> $DEBUG
    echo "* try using pppoe-sniff." >> $DEBUG
    echo "rp-pppoe debugging dump" >> $DEBUG
    cat $DEBUG-0 >> $DEBUG
    rm -f $DEBUG-0
    for i in 1 2 3 4 5 6 7 8 9 10 ; do
    echo ""
    echo ""
    echo ""
    done
    echo "*** Finished debugging run.  Please review the file"
    echo "*** '$DEBUG' and try to"
    echo "*** figure out what is going on."
    echo "***"
    echo "*** Unfortunately, we can NO LONGER accept debugging"
    echo "*** output for analysis.  Please do not send this to"
    echo "*** Roaring Penguin; it is too time-consuming for"
    echo "*** us to deal with all the analyses we have been sent."
    exit 0
fi

echo $$ > $PIDFILE

while [ true ] ; do
    if test "$LINUX_PLUGIN" != "" ; then
	$SETSID $PPPD $PPP_STD_OPTIONS $DEMAND &
	echo "$!" > $PPPD_PIDFILE
    else
	$SETSID $PPPD pty "$PPPOE_CMD" \
	    $PPP_STD_OPTIONS \
	    $DEMAND \
	    $PPPD_SYNC &
	echo "$!" > $PPPD_PIDFILE
    fi
    wait

    # Run /etc/ppp/adsl-lost if it exists
    test -x /etc/ppp/adsl-lost && /etc/ppp/adsl-lost

    # Re-establish the connection
    $LOGGER -p daemon.notice \
        "ADSL connection lost; attempting re-connection."

    # Wait a bit in case a problem causes tons of log messages :-)
    sleep 5
done