wifi2ether_share

#!/bin/bash
clear
echo "Instalando dependencias..."
apt-get install dnsmasq iptables  -y 

echo " ";

#Selecionando interfaz wifi
echo "Tarjetas wifi disponibles"
#iwconfig  2>/dev/null |grep IEEE |awk '{print $1}'
iwconfig  2>/dev/null |grep IEEE |awk '{ print "\033[1m"$1"\033[0m"}'
echo " ";
echo "Introduzca el nobre de la tarjeta que se conectara a internet (ej: wlan0) :";
echo " ";
read WIFICARD
echo "Tarjeta selecionada : $WIFICARD";
echo " ";

#Selecionando interfaz ethernet
echo "Tarjetas ethernet disponibles"
#iwconfig  2>&1 >/dev/null | grep "no wireless extensions" |awk '{print $1}'
#iwconfig  2>&1 | grep "no wireless extensions" |awk '{print $1}'
iwconfig  2>&1 | grep "no wireless extensions"|awk '{ print "\033[1m"$1"\033[0m"}'
echo " ";
echo "Introduzca el nobre de la tarjeta  ethernet que ofrecerá internet (ej: eth0) :";
echo " ";
read ETHCARD
echo "Tarjeta selecionada : $ETHCARD";
echo " ";

#Selecionando red wifi 
echo "Redes WIFI detectadas: "
iwlist $WIFICARD scan |grep ESSID 
echo " ";
echo "Introduzca el nobre de la red  (ej: WLAN_XXXX) :";
echo " ";
read WIFIESSID
echo "Red selecionada : $WIFIESSID";
echo " ";
echo "Introduzca la contraseña de la red wifi :";
echo " ";
read WIFIPASS
echo " ";
 


####### Generando archivo interfaces ##########
echo "Prearando interfaces..."
rm interfaces 2>/dev/null
echo "#source-directory /etc/network/interfaces.d
auto lo
iface lo inet loopback


auto $ETHCARD
iface $ETHCARD inet static
      address 192.168.0.1
      netmask 255.255.255.0
      broadcast 192.168.0.255


auto $WIFICARD
iface $WIFICARD inet dhcp
	pre-up sudo iwconfig $WIFICARD power on
      	wpa-ssid $WIFIESSID
       	wpa-psk $WIFIPASS
	post-up sudo share $WIFICARD $ETHCARD

" > interfaces

####### Generando archivo share ##########
echo "Prearando NAT..."
rm share 2>/dev/null
echo '#!/bin/bash
sudo iptables -t nat -A POSTROUTING -o "$1" -j MASQUERADE
sudo iptables -A FORWARD -i "$1" -o "$2" -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i "$2" -o "$1" -j ACCEPT' > share

cp share /usr/bin/share
chmod +x /usr/bin/share

#################################################
if [ -e /etc/router ]
then
#nada que hacer
echo ""
else

	cp /etc/network/interfaces /etc/network/interfaces.bak
	echo 1 > /proc/sys/net/ipv4/ip_forward
	echo "Configurando net.ipv4.ip_forward=1 en /etc/sysctl.conf ..."
	echo " " >> /etc/sysctl.conf
	echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
	sysctl --system

	echo "Configurando servidor dhcp..."
	echo " " >> /etc/dnsmasq.conf 
	echo "listen-address=192.168.0.1" >> /etc/dnsmasq.conf 
	echo "bind-interfaces" >> /etc/dnsmasq.conf 
	echo "dhcp-range=192.168.0.2,192.168.0.254,12h" >> /etc/dnsmasq.conf
	echo 1 > /etc/router
fi

echo "Configurando interfaces..."
cp interfaces /etc/network/interfaces
echo "Reiniciando tarjetas de red..."
ifdown -a -vv
ifup -a -vv 
echo "Reiniciando dnsmasq..."
/etc/init.d/dnsmasq restart

echo " ";
echo "FINALIZADO"
exit 0