File: ppp-on-ssh

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ppp 2.4.7-2+4.1
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#!/bin/sh
#
# A sample script to establish PPP session(s) via SSH 1.x
#
# Adi Masputra <adi.masputra@sun.com>
# Jan 24, 2000
#

#
# You'd definitely want to change the following addresses to suit
# your network configuration
#
LOC_IP=10.0.0.1
REM_IP=10.0.0.2
NETMASK=255.255.0.0

export LOC_IP REM_IP

#
# This is the remote peer where sshd is running, either
# its hostname or IP address
#
PPPD_RHOST=myremotehost

#
# For this example, we assume that pppd on both local and remote
# machines reside in the same place, /usr/local/bin/pppd
#
PPPD_LOC=/usr/local/bin/pppd

#
# The location of local options file (where ssh client is running).
# Note that the sample options file included in the distribution
# may need further customizations, depending on your needs. The 'noauth'
# option specified in the file is there to simplify the example, although
# some may choose to have it there and rely on ssh authentication
# instead.
#
PPPD_LOC_OPT=/etc/ppp/options-ssh-loc

#
# The location of remote options file (where sshd daemon is running)
# Note that the sample options file included in the distribution
# may need further customizations, depending on your needs. The 'noauth'
# option specified in the file is there to simplify the example, although
# some may choose to have it there and rely on ssh authentication
# instead. Also note that the remote options file need to include the 'notty'
# options for this to work.
#
PPPD_REM_OPT=/etc/ppp/options-ssh-rem

#
# The location of ssh client on the local machine
#
SSH_LOC=/usr/local/bin/ssh

export PPPD_LOC PPPD_LOC_OPT PPPD_REM_OPT PPPD_RHOST SSH_LOC

#
# Uncomment the following to enable IPv6, note that the IPv6 support 
# needs to be enabled during compilation
#
# PPPD_IPV6='+ipv6 ipv6cp-use-ipaddr'
export PPPD_IPV6

#
# And execute pppd with the pty option, specifying ssh client as the
# slave side of the pseudo-tty master/slave pair. Note that on this example,
# ssh has been compiled to allow NULL encryption (thus the '-c none' option),
# but in reality, you'd probably want to specify the encryption algorithm.
# See the man page of ssh(1) for details.
#
exec $PPPD_LOC \
        pty '$SSH_LOC -c none $PPPD_RHOST $PPPD_LOC $REM_IP:$LOC_IP $PPPD_IPV6 file $PPPD_REM_OPT' \
        $LOC_IP:$REM_IP netmask $NETMASK $PPPD_IPV6 file $PPPD_LOC_OPT