Quick proxy script for sharing internet among devices

I created this script to automatize sharing of the hotspot connection I’m using.

Scenario:
My laptop is connected to the hotspot wifi. This internet connection will be shared to a router via an ethernet cable (which is also plugged to the laptop). The router then will distribute the connection to multiple devices.


Usage:
1. Clone or add the script to your .bin folder the script :: https://github.com/xdth/qproxy
2. Edit the parameters as you like
3. Setup the router having the as WAN IP, the internal interface IP in the script

Enjoy.


#!/bin/sh

# ############################ QuickProxy 0.1 ##########################
#
# This script will create a proxy to share internet connection to another
# device.
#
# Notes:
# 1. Modify the parameters below according to your needs.
# 2. For convenience, add this script to your /usr/bin or alike with
#    chmod +x permissions.
# 3. License: MIT
# 4. Author: dth at alterland dot net  -  Brussels, May 23, 2016
# #######################################################################


# #######################################################################
# ## Parameters

# The interface that will be used by the client
qproxy_internal_interface="";

# The IP/CIDR subnet mask for the above interface
qproxy_internal_interface_ip="";

# The WAN interface
qproxy_external_interface="";


# #######################################################################
# ## Main

# Waking up the client's interface
ip link set up dev $qproxy_internal_interface

# Setting it's IP
ip addr add $qproxy_internal_interface_ip dev $qproxy_internal_interface

# Enabling packet forwarding
sysctl net.ipv4.ip_forward=1

# Enabling NAT
iptables -t nat -A POSTROUTING -o $qproxy_external_interface -j MASQUERADE
iptables -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -i $qproxy_internal_interface -o $qproxy_external_interface -j ACCEPT

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