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#!/bin/bash -e |
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if [ $# -ne 2 ]; then |
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echo "Usage: share-network.sh <internal interface> <external interface>" |
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exit 1 |
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fi |
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sudo whoami >/dev/null # Make sudo cache the password |
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mkdir share-network$$ |
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cd share-network$$ |
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cat >dnsmasq.conf <<HEREDOC |
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no-hosts |
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dhcp-range=192.168.77.100, 192.168.77.200, 255.255.255.0, 24h |
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dhcp-range=fd10:cafe::100, fd10:cafe::500, 64, 24h |
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enable-ra |
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HEREDOC |
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echo "interface=$1" >> dnsmasq.conf |
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echo -e "\033[32m:: Enabling interface" |
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sudo ip link set dev $1 up |
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echo -e "\033[32m:: Adding IP addresses" |
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sudo ip addr add 192.168.77.1/32 scope link dev $1 |
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sleep 0.1 # wat |
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sudo ip addr add fd10:cafe::1/64 scope link dev $1 |
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echo -e "\033[32m:: Adding routes" |
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sudo ip route add 192.168.77.0/24 dev $1 scope link src 192.168.77.1 |
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echo -e "\033[32m:: Adding NAT rules" |
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sudo sysctl net.ipv4.ip_forward=1 &>/dev/null |
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sudo iptables -t nat -A POSTROUTING -o $2 -j MASQUERADE |
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sudo iptables -A FORWARD -i $2 -o $1 -m state --state RELATED,ESTABLISHED -j ACCEPT |
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sudo iptables -A FORWARD -i $1 -o $2 -j ACCEPT |
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echo -e "\033[32m:: Starting dnsmasq" |
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echo -e "\033[33m!! Press ^C to stop the interface sharing" |
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sudo dnsmasq -k -x dnsmasq.pid -C dnsmasq.conf -l dnsmasq.leases || true |
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echo |
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echo -e "\033[32m:: Removing NAT rules" |
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sudo iptables -t nat -D POSTROUTING -o $2 -j MASQUERADE |
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sudo iptables -D FORWARD -i $2 -o $1 -m state --state RELATED,ESTABLISHED -j ACCEPT |
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sudo iptables -D FORWARD -i $1 -o $2 -j ACCEPT |
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echo -e "\033[32m:: Removing routes" |
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sudo ip route del 192.168.77.0/24 dev $1 scope link src 192.168.77.1 |
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echo -e "\033[32m:: Removing IP addresses" |
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sudo ip addr del 192.168.77.1/32 scope link dev $1 |
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sudo ip addr del fd10:cafe::1/64 scope link dev $1 |
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echo -e "\033[32m:: Disabling interface" |
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sudo ip link set dev $1 down |
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rm -f dnsmasq.conf dnsmasq.pid dnsmasq.leases |
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cd .. |
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rmdir share-network$$ |
