For RMIT proxy use. Execute this script everytime you open a new terminal.

rmitproxy_public.sh

#!/bin/bash

# =============================================================================
# If the computer is currently connected to RMIT's network then this
# script will set the appropriate proxy environment variables, otherwise
# it just unsets everything.
#
# Also includes special proxy configs for:
# - git
# - apt
# - gsettings (which many programs, including Firefox, use)
# 
# Make sure this file is executable using this command:
#       chmod +x rmitproxy_public.sh
# 
# For ubuntu users, put this script in
#       /etc/network/if-up.d
# to execute it every time your computer connects to a network :)
# (but the environment variables will not be set system-wide so you have to
# execute it every time you open a new terminal just to be sure)
#
# Inpired by:
# http://askubuntu.com/questions/150210/how-do-i-set-systemwide-proxy-servers-in-xubuntu-lubuntu-or-ubuntu-studio/151047#151047
# =============================================================================

# Sensitive info. Edit where needed.
user=s1111111   # Your s-number here
pass='password' # Your RMIT password here (surrounded by '' just to be safe)
sudopw='someOtherPassword' # Your Linux sudo password
host=proxy.rmit.edu.vn
port=8080

# =============================================================================
# DO NOT TOUCH anything below unless you know what you're doing!
# =============================================================================

# Let root know which X display we're using. Without this, the
# notification will not be displayed
export DISPLAY=:0.0

# RMIT's SSID
ssid=RMITWPA

# Check if connected to wired (ethernet) RMIT network.
isRmitWired=`ifconfig eth0 | grep 172.16.` # Ugly hack. TODO improve this.


rmitOn() {

    # Standard environment variables

    http_str=http://$user:$pass@$host:$port
    https_str=https://$user:$pass@$host:$port

    http=( http_proxy HTTP_PROXY FTP_PROXY ftp_proxy )
    for envar in $http
    do
        export $envar=$http_str
    done

    https=( https_proxy HTTPS_PROXY )
    for envar in $https
    do
        export $envar=$https_str
    done

    export no_proxy="localhost,127.0.0.1,localaddress,.localdomain.com"
    export NO_PROXY="localhost,127.0.0.1,localaddress,.localdomain.com"

    # Gnome proxy settings
    gsettings set org.gnome.system.proxy.http host $host
    gsettings set org.gnome.system.proxy.https host $host
    gsettings set org.gnome.system.proxy mode 'manual'

    # Hardcore stuff ahead - requiring sudo permission
    # =====================================================================

    # /etc/apt/apt.conf - If you ever want to install stuff while at RMIT
    aptconf=$(echo -e "Acquire::http::proxy \"$http_str\";\nAcquire::https::proxy \"$https_str\";")

    # Write apt.conf file content to temporary file then move it to its
    # appropriate location. For some weird reason I can't write directly to
    # a file in /etc/apt/
    echo $aptconf > ~/tmp_apt_conf
    echo $sudopw | sudo -S mv -f ~/tmp_apt_conf /etc/apt/apt.conf || true

    # Git
    git config --global http.proxy "$http_str" || true
    git config --global https.proxy "$https_str" || true
    # Comment out the following line if you haven't got a specific gitproxy
    # executable. I myself have a small script to pipe it through socat.
    #git config --global core.gitproxy '/bin/gitproxy'

    notify-send "RMIT Mode On"
}


rmitOff() {

    envars=( https_proxy HTTPS_PROXY http_proxy HTTP_PROXY FTP_PROXY ftp_proxy all_proxy ALL_PROXY)
    for envar in $envars
    do
        export $envar=""
    done

    # Gnome proxy settings
    gsettings set org.gnome.system.proxy.http host ""
    gsettings set org.gnome.system.proxy.https host ""
    gsettings set org.gnome.system.proxy mode 'none'

    # Hardcore stuff ahead - requiring sudo permission
    # =====================================================================

    # Switch apt conf file
    aptconf=""
    # Write apt.conf file content to temporary file then move it to its
    # appropriate location. For some weird reason I can't write directly to
    # a file in /etc/apt/
    echo $aptconf > ~/tmp_apt_conf
    echo $sudopw | sudo -S mv -f ~/tmp_apt_conf /etc/apt/apt.conf || true

    # Git
    git config --global http.proxy "" || true
    git config --global https.proxy "" || true
    git config --global core.gitproxy ''

    notify-send "RMIT Mode Off"
}

# If one of these is true:
#   - connected to a wired (ethernet) network that has RMIT's IP scheme
#   - current network SSID is RMIT's
# then set up the proxy, otherwise unset everything

if [ `iwgetid -s | grep $ssid` ] || [ "$isRmitWired" ] ; then
    rmitOn
    echo "Connected to RMIT network. Proxy settings applied."
else
    rmitOff
    echo "Not on '$ssid'. Proxy settings cleared."
fi