share internet

#!/bin/bash

# defaults
WAN=ppp0
LAN=wlan0
LANIP="192.168.133.1"
DHCPR="192.168.133.2,192.168.133.254"
DNS="208.67.222.222,8.8.4.4"

RED=$(tput setaf 1 && tput bold)
GREEN=$(tput setaf 2 && tput bold)
STAND=$(tput sgr0)
BLUE=$(tput setaf 6 && tput bold)

usage() {
    echo "USAGE: $0 [-v][-d] [WAN=$WAN] [LAN=$LAN] [LANIP=$LANIP] [DHCPR=$DHCPR]"
    echo "USAGE: $0 [-v][-d] [WAN=$WAN] [LAN=$LAN] # disable forwarding"
    echo "USAGE: $0 [-v][-l] # print status"
    echo "defaults: WAN=ppp0 LAN=wlan0 LANIP=192.168.133.1 DNS=8.8.8.8,8.8.4.4 DHCPR=192.168.133.2,192.168.133.254"
}

list() {
    echo "Forwarding information"
    iptables -L
    echo ""
    iptables -L -t nat
    echo -e "\n/proc/sys/net/ipv4/ip_forward: $(cat /proc/sys/net/ipv4/ip_forward)"
}

listsettings() {
    echo "WAN=$WAN, LAN=$LAN LANIP=$LANIP DHCPR=$DHCPR"
}

# setup forwarding and the dnsmasq service
fwd() {
    sysctl -w net.ipv4.ip_forward=1

    # Put the interface in Ad-hoc mode
    iwconfig $LAN mode Ad-Hoc

    # Set the essid for the access point
    iwconfig $LAN essid TheH0le

    # Set auto channel
    iwconfig $LAN channel auto

    # Set the security (WEP)

    # Set Key
    #iwconfig $LAN key restricted s:0x000

    # Set encryption
    #iwconfig $LAN key on


    ifconfig $LAN $LANIP/24 netmask 255.255.255.0 up

    #iptables -A FORWARD -o $WAN -i $LAN -s $LANIP/24 -m conntrack --ctstate NEW -j ACCEPT
    #iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
    #iptables -t nat -A POSTROUTING -o $WAN -j MASQUERADE
    iptables-restore < /home/0x00/rules


    /usr/bin/dnsmasq -C /dev/null > /dev/null 2>&1 \
        --domain-needed \
        --bogus-priv \
        --interface=$LAN \
        --dhcp-option=6,$DNS \
        --listen-address=$LANIP \
        --dhcp-range=$DHCPR,12h \

    echo "to disable: $0 -d"
}

# remove forwarding and the dnsmasq service
unfwd() {
    pkill -9 dnsmasq
    ifconfig $LAN down

    sysctl -w net.ipv4.ip_forward=0

    #iptables -D FORWARD -o $WAN -i $LAN -s $LANIP/24 -m conntrack --ctstate NEW -j ACCEPT
    #iptables -D FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
    iptables -F

    iwconfig $LAN mode managed
}

# calculate DHCPR
mkrange() {
    PRE=$(echo $LANIP | cut -d. -f-3)
    SUF=$(echo $LANIP | cut -d. -f4)
    DHCPR="$PRE.$(($SUF+1)),$PRE.253"
}

#--------

for arg in "$@"
do
    case "$arg" in
        WAN=*|LAN=*|LANIP=* )
            eval $arg
            ;;
        DHCPR=* )
            eval $arg
            DHCPFLAG=true
            ;;
        -d )
            echo "deleting forwarding"
            DISABLE=true
            ;;
        -l )
            LIST=true
            ;;
        -v )
            VERBOSE=true
            ;;
        * )
            usage
            exit 0
            ;;
    esac
done


[ $DHCPFLAG ]   || mkrange
[ $VERBOSE ]    && listsettings
[ $LIST ]       && list && exit 1

if [ ! $DISABLE ] ; then
    fwd
else
    unfwd
fi
eri