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#!/bin/sh
# run with su -i;e.g. su -i && gen_wg_config.sh
set -x
set -e
CONFIG_CONTENT="[Interface]\n
Address = 10.10.0.<RAND_ADDRESS>/32\n
Address = fd86:ea04:1111::<RAND_ADDRESS>/128\n
PrivateKey = <CLIENT_PRIV_KEY>\n
DNS = 1.1.1.1\n
\n
[Peer]\n
PublicKey = SERVERPUBKEY\n
Endpoint = <PUB_IP_ADDRESS>:51820\n
AllowedIPs = 0.0.0.0/0, ::/0"
CONFIG_FILE_DIR=~/config
mkdir -p $CONFIG_FILE_DIR
RAND_NAME=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)
RAND_ADDRESS=$(shuf -i 1-255 -n 1)
OWNER=$(echo $USER)
TMPDIR=$(mktemp -d)
cd $TMPDIR
wg genkey | sudo tee privatekey"$RAND_NAME" | wg pubkey | sudo tee publickey"$RAND_NAME"
SERVER_PUB_KEY=$(cat /etc/wireguard/publickey)
CLIENT_PRIV_KEY=$(cat privatekey"$RAND_NAME")
PUB_IP_ADDRESS=$(curl ipinfo.io/ip)
OUTPUT=$(echo $CONFIG_CONTENT | sed "s%SERVERPUBKEY%$SERVER_PUB_KEY%")
OUTPUT=$(echo $OUTPUT | sed "s%<CLIENT_PRIV_KEY>%$CLIENT_PRIV_KEY%")
OUTPUT=$(echo $OUTPUT | sed "s/<PUB_IP_ADDRESS>/$PUB_IP_ADDRESS/")
OUTPUT=$(echo $OUTPUT | sed "s/<RAND_ADDRESS>/$RAND_ADDRESS/g")
cd $CONFIG_FILE_DIR
echo $OUTPUT > wg"$RAND_NAME".conf
chmod 600 wg"$RAND_NAME".conf
chown $USER:$USER wg"$RAND_NAME".conf
CLIENT_PUB_KEY=$(cat $TMPDIR/publickey"$RAND_NAME")
wg set wg0 peer $CLIENT_PUB_KEY allowed-ips 10.10.0."$RAND_ADDRESS"/32,fd86:ea04:1111::"$RAND_ADDRESS"/128
rm -rf $TEMPDIR
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