pkvnc

#!/bin/bash
################################[ This file is placed in the Public Domain. ]##
#
# This highly self-referencial script will open up VNC via. PageKite.
#
# It is assumed that the VNC server has a raw PageKite service registered
# on whatever port is given to the vnc viewer.
#
# It requires GNU netcat and (OpenBSD netcat OR socat), and a vnc viewer that
# understands the -via argument and uses the VNC_VIA_CMD environment variable.  If you
# don't have them, this might help:
#
#   sudo apt-get install xvnc4viewer netcat-traditional socat
#
# (socat is preferred, as it uses SSL to connect to the front-end)
#
NC_TRAD=nc.traditional
NC_OPEN=nc.openbsd
VNC_CMD=xvnc4viewer

SC_OPEN=socat
SC_SSL_AUTH="capath=/etc/ssl/certs/"
# If self-signed, use: SC_SSL_AUTH="verify=0"

SELF="$0"
if [ "$PKVNC_LPORT" = "" ]; then
  if [ "$1" != "--nc" ]; then
    # Invoked by the user!
    export VNC_VIA_CMD="$SELF --nc "'"$L" "$H" "$R"'
    exec "$VNC_CMD" -via 127.0.0.1 "$@"
  else
    # Invoked by the vncviewer!
    export PKVNC_LPORT="$2"
    export PKVNC_RHOST="$3"
    export PKVNC_RPORT="$4"
    "$NC_TRAD" -l -p "$PKVNC_LPORT" -e "$SELF" &
  fi
else
  # Invoked by netcat!
  if [ "$(which $SC_OPEN)" == "" ]; then
    # No socat available, try netcat.
    echo 1>&2
    echo 'WARNING: Connection to $PKVNC_RHOST:443 is not encrypted.' 1>&2
    echo '         Please install socat if you care.' 1>&2
    echo 1>&2
    exec "$NC_OPEN" -X connect -x "$PKVNC_RHOST:443" "$PKVNC_RHOST" "$PKVNC_RPORT"
  else
    # We have socat!  Use the more secure SSL connection, manual HTTP CONNECT
    (
       echo CONNECT $PKVNC_RHOST:$PKVNC_RPORT HTTP/1.0
       echo
       exec cat
    ) | exec "$SC_OPEN" - "openssl:$PKVNC_RHOST:443,$SC_SSL_AUTH" | (
       read REPLY
       read NOTHING
       exec cat
    )
  fi
fi