Created
July 4, 2012 01:16
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Script to build a VPN through SSH
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#!/usr/bin/sudo sh | |
# Configure this | |
SSH_HOST="myhost.com.br" | |
SSH_PORT="2222" | |
########### | |
SSH_LOGIN="root" # ONLY root CAN SETUP TUNNELS :-( | |
####################################################### | |
# USUALLY, you don't need to configure this | |
IP_VPN_CLIENT="10.80.0.200" | |
IP_VPN_SERVER="10.80.0.100" | |
IFACE_VPN_CLIENT="tun0" | |
IFACE_VPN_SERVER="tun9" | |
####################################################### | |
# TRY TO DISCOVERY DEFAULT ROUTE | |
IP_GW=$( route -n | awk '/^0.0.0.0/ { print $2 }' ) | |
IFACE_GW=$( route -n | awk '/^0.0.0.0/ { print $8 }' ) | |
####################################################### | |
# SSH TO SERVER AND SETUP IT | |
SSH_HOST_IP=$( host -t A "$SSH_HOST" |awk '{print $4}' ) | |
N_TUN_CL=$( echo "$IFACE_VPN_CLIENT" | perl -pe 's/\D+//' ) | |
N_TUN_SR=$( echo "$IFACE_VPN_SERVER" | perl -pe 's/\D+//' ) | |
ssh -f -w $N_TUN_CL:$N_TUN_SR "$SSH_LOGIN"@"$SSH_HOST_IP" -p"$SSH_PORT" "bash << END | |
#!/bin/sh | |
# SERVER SETUP | |
# Setup interface | |
ip link set \"$IFACE_VPN_SERVER\" up | |
ip addr add \"$IP_VPN_SERVER\"/32 peer \"$IP_VPN_CLIENT\" dev \"$IFACE_VPN_SERVER\" | |
# enable ip forward | |
echo 1 > /proc/sys/net/ipv4/ip_forward | |
IFACE_GW=\$( route -n | awk '/^0.0.0.0/ { print \$8 }' ) | |
# configure nat | |
iptables -t nat -L | grep \"$IP_VPN_CLIENT\" >/dev/null | |
if [ \"\\\$?\" != \"0\" ]; then | |
iptables -t nat -I POSTROUTING -s \"$IP_VPN_CLIENT\" -o \"\\\$IFACE_GW\" -j MASQUERADE | |
iptables -I FORWARD -d \"$IP_VPN_CLIENT\" -o \"$IFACE_VPN_SERVER\" -i \"\\\$IFACE_GW\" -j ACCEPT | |
iptables -I FORWARD -s \"$IP_VPN_CLIENT\" -i \"$IFACE_VPN_SERVER\" -o \"\\\$IFACE_GW\" -j ACCEPT | |
fi | |
END | |
" | |
####################################################### | |
ip link set $IFACE_VPN_CLIENT up | |
ip addr add "$IP_VPN_CLIENT"/32 peer "$IP_VPN_SERVER" dev "$IFACE_VPN_CLIENT" | |
ip route add "$SSH_HOST_IP"/32 via "$IP_GW" dev "$IFACE_GW" | |
ip route replace default via "$IP_VPN_SERVER" | |
echo "VPN started" | |
echo "Press any key to stop it" | |
read l | |
pid=$( pgrep -f ssh\ -f\ -w\ $N_TUN_CL:$N_TUN_SR\ "$SSH_LOGIN"@"$SSH_HOST_IP"\ -p"$SSH_PORT"\ bash ) | |
kill -9 "$pid" | |
ip route replace default via "$IP_GW" dev "$IFACE_GW" | |
ip route del "$SSH_HOST_IP"/32 via "$IP_GW" dev "$IFACE_GW" |
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