change-proxy.sh

#!/bin/sh

# This script is used to change proxy settings.
#
# Original source: http://www.codinginahurry.com/2011/06/22/script-for-changing-gnome-proxy-settings/
#
# Configuration in /etc/environment requires the `augtool` program
# (located in `augeas-tools` for Debian/Ubuntu).

if [ "$(id -u)" = "0" ] ; then 
  echo "Setting up system wide settings."
  CONF=/etc/gconf/gconf.xml.defaults
else
  echo "Setting up user settings."
  CONF=~/.gconf
fi

if [ ! -w $CONF ]; then
  echo "$CONF is not readable."
  exit 1
fi

PROXY_HOST=$1
PROXY_PORT=${2-8080}
PROXY_USERNAME=$3
PROXY_PASSWORD=$4

if [ -n "$PROXY_HOST" ]
then
    echo "Setting proxy configuration: $PROXY_HOST:$PROXY_PORT"

    gconftool-2 --direct --config-source xml:readwrite:$CONF --type string --set /system/proxy/mode "manual"
    gconftool-2 --direct --config-source xml:readwrite:$CONF --type string --set /system/http_proxy/host "$PROXY_HOST"
    gconftool-2 --direct --config-source xml:readwrite:$CONF --type int    --set /system/http_proxy/port "$PROXY_PORT"
    gconftool-2 --direct --config-source xml:readwrite:$CONF --type bool   --set /system/http_proxy/use_same_proxy "TRUE"
    gconftool-2 --direct --config-source xml:readwrite:$CONF --type bool   --set /system/http_proxy/use_http_proxy "TRUE"
    
    #gconftool-2 --direct --config-source xml:readwrite:$CONF --type list   --set /system/http_proxy/ignore_hosts [localhost,127.0.0.0/8,*.local]

    if [ -n "$PROXY_USERNAME" ]
    then
        echo "Using authentication information: $PROXY_USERNAME:$PROXY_PASSWORD"
        gconftool-2 --direct --config-source xml:readwrite:$CONF --type=bool   --set /system/http_proxy/use_authentication "TRUE"
        gconftool-2 --direct --config-source xml:readwrite:$CONF --type=string --set /system/http_proxy/authentication_user "$PROXY_USERNAME"
        gconftool-2 --direct --config-source xml:readwrite:$CONF --type=string --set /system/http_proxy/authentication_password "$PROXY_PASSWORD"
    else
        gconftool-2 --direct --config-source xml:readwrite:$CONF --type=bool   --set /system/http_proxy/use_authentication "FALSE"
    fi

    # Setup PROXY_STRING used for environment configuration
    if [ "$PROXY_USERNAME$PROXY_PASSWORD" != "" ] ; then
      PROXY_STRING="$PROXY_USERNAME:$PROXY_PASSWORD@$PROXY_HOST:$PROXY_PORT"
    else
      PROXY_STRING="$PROXY_HOST:$PROXY_PORT"
    fi
else
    echo "Removing proxy configuration."

    # sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /system/proxy/mode "none"
    gconftool-2 --direct --config-source xml:readwrite:$CONF --type string --set /system/proxy/mode "none"

    # gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/proxy/mode
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/host
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/port
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/use_same_proxy
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/use_http_proxy
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/use_authentication
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/authentication_user
    gconftool-2 --direct --config-source xml:readwrite:$CONF --unset /system/http_proxy/authentication_password

    PROXY_STRING=""
fi

if which augtool >/dev/null ; then
  echo "Setting up /etc/environment."
  echo "set /files/etc/environment/http_proxy '$PROXY_STRING'
    set /files/etc/environment/https_proxy '$PROXY_STRING'
    set /files/etc/environment/ftp_proxy '$PROXY_STRING'
    save" | sudo augtool
else
  echo "Skipping configuration in /etc/environment: augtool not found."
fi

pkill gconfd