#!/bin/bash
################################################################################
## Custom network initialization script.
## 2012-09-04
################################################################################
## Deps: wpa_supplicant, ccrypt
##
## Use 'wpa_passphrase essid $PW >> /etc/wpa_supplicant.conf', where PW is a
## variable containing the password.  You can set PW securely by using a shell
## built-in like 'read -s PW'.
##
## There is an Emacs plugin for editing crypted files directly. See 'man
## ccrypt'.

type ccrypt > /dev/null
if [ $? -ne 0 ]; then
    echo "You need to have 'ccrypt' installed."
    exit
fi

if [ $(id -u) -ne 0 ]; then
    echo "You must be root to run this script."
    exit
fi

NET_INTERFACE=wlan0
WPA_SUPPLICANT_CONF="$(ccat /etc/wpa_supplicant.conf.cpt)"
TIMEOUT_LIMIT=500

## Clean running processes if any.
pkill dhcpcd
pkill wpa_supplicant

## In case network inteface is not up.
ip link set ${NET_INTERFACE} up

## Connection.
if [ $# -eq 0 ]; then
    # Associate if needed.
    if [ -n "$(iwconfig ${NET_INTERFACE} | grep 'Not-Associated')" ]; then
        wpa_supplicant -B -i ${NET_INTERFACE} -D wext -c <(echo "${WPA_SUPPLICANT_CONF}")
    fi

    ## Wait until wpa_supplicant has finished association.
    i=0
    while [ -n "$(iwconfig ${NET_INTERFACE} | grep 'off/any')" ] && [ $i -lt $TIMEOUT_LIMIT ] ; do
        i=$(($i+1))
    done
fi

## Get IP.
dhcpcd ${NET_INTERFACE}