Add wireguardConfigGenerator.sh
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138
wireguardConfigGenerator.sh
Executable file
138
wireguardConfigGenerator.sh
Executable file
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#!/bin/bash
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set -e
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function print_help {
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echo "Generates config for wireguard"
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echo "-h - prints this help"
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echo "-n <name> - gives a name to the config"
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echo "-c <count> - number of clients to generate for"
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echo "-i <ipv4_third> - sets the third byte of the ipv4"
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echo "-e <endpoint> - ip address or domain name (required)"
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echo "-p <port> - listen port of server (defaults to 50000)"
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echo "-k - enables persistent keepalive for clients"
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echo "-o <directory> - output dir to place configs (required)"
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}
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WGNAME="wg$(date | sha1sum | head -c 8)"
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CLIENT_COUNT=1
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IPV4_FIRST=10
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IPV4_SECOND=8
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IPV4_THIRD=0 # this can be modified with "-i <integer>"
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# IPV4_FOURTH is generated automatically. Server starts with 1, and clients increment afterward.
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SERVER_ENDPOINT="REQUIRED"
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SERVER_LISTEN_PORT=50000
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ENABLE_PERSISTENT_KEEPALIVE=0
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CONFIG_OUTPUT_DIRECTORY="REQUIRED"
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# OPTARG
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while getopts 'hn:c:i:e:p:ko:' opt; do
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if [ "$opt" == "?" ]; then
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print_help
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exit 1
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elif [ "$opt" == "h" ]; then
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print_help
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exit 0
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elif [ "$opt" == "n" ]; then
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WGNAME="$OPTARG"
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elif [ "$opt" == "c" ]; then
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CLIENT_COUNT="$OPTARG"
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elif [ "$opt" == "i" ]; then
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IPV4_THIRD="$OPTARG"
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elif [ "$opt" == "e" ]; then
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SERVER_ENDPOINT="$OPTARG"
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elif [ "$opt" == "p" ]; then
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SERVER_LISTEN_PORT="$OPTARG"
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if [[ ! "${SERVER_LISTEN_PORT}" =~ [0-9]+ ]]; then
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echo "ERROR: Given port is not a number"
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exit 5
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elif (($SERVER_LISTEN_PORT > 65536)); then
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echo "ERROR: Given port is too large"
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exit 6
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fi
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elif [ "$opt" == "k" ]; then
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ENABLE_PERSISTENT_KEEPALIVE=1
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elif [ "$opt" == "o" ]; then
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CONFIG_OUTPUT_DIRECTORY="$OPTARG"
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fi
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done
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if [ "$SERVER_ENDPOINT" == "REQUIRED" ]; then
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echo "ERROR: Endpoint is not set with \"-e\" !"
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exit 2
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elif [ "$CONFIG_OUTPUT_DIRECTORY" == "REQUIRED" ]; then
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echo "ERROR: Output directory is not set with \"-o\" !"
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exit 3
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elif [ ! -d "$CONFIG_OUTPUT_DIRECTORY" ]; then
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echo "ERROR: dir set with \"-o\" is not a directory!"
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exit 4
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fi
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echo "Creating config with name \"$WGNAME\" with \"$CLIENT_COUNT\" clients..."
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mkdir -p "$HOME/temp"
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TEMP_DIR=$(mktemp -d -p "$HOME/temp")
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# first create server config
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SERVER_CONF="${TEMP_DIR}/${WGNAME}server.conf"
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SERVER_PRK="$(wg genkey)"
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SERVER_PUB="$(echo -n ${SERVER_PRK} | wg pubkey)"
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echo "Creating server conf (will be appended to with client info)..."
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cat >> "${SERVER_CONF}" <<EOF
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[Interface]
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Address = ${IPV4_FIRST}.${IPV4_SECOND}.${IPV4_THIRD}.1/24
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ListenPort = ${SERVER_LISTEN_PORT}
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PrivateKey = ${SERVER_PRK}
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EOF
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# generate config per each client
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for ((i = 0; i < $CLIENT_COUNT; ++i)); do
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CLIENT_CONF="${TEMP_DIR}/${WGNAME}client${i}.conf"
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CLIENT_PRK="$(wg genkey)"
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CLIENT_PUB="$(echo -n ${CLIENT_PRK} | wg pubkey)"
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CLIENT_PRE="$(wg genpsk)"
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echo "Appending client $((i + 1)) to server conf..."
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cat >> "${SERVER_CONF}" <<EOF
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[Peer]
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PublicKey = ${CLIENT_PUB}
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PresharedKey = ${CLIENT_PRE}
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AllowedIPs = ${IPV4_FIRST}.${IPV4_SECOND}.${IPV4_THIRD}.$((i + 2))/32
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EOF
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echo "Creating client $((i + 1)) conf..."
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cat >> "${CLIENT_CONF}" <<EOF
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[Interface]
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Address = ${IPV4_FIRST}.${IPV4_SECOND}.${IPV4_THIRD}.$((i + 2))/24
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PrivateKey = ${CLIENT_PRK}
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[Peer]
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PublicKey = ${SERVER_PUB}
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PresharedKey = ${CLIENT_PRE}
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AllowedIPs = ${IPV4_FIRST}.${IPV4_SECOND}.${IPV4_THIRD}.1/32
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Endpoint = ${SERVER_ENDPOINT}:${SERVER_LISTEN_PORT}
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EOF
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if (($ENABLE_PERSISTENT_KEEPALIVE)); then
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cat >> "${CLIENT_CONF}" <<EOF
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PersistentKeepAlive = 25
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EOF
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fi
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done
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# output configs to output directory
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echo "Placing generated configs to output directory..."
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cp -v "$SERVER_CONF" "${CONFIG_OUTPUT_DIRECTORY}/"
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for ((i = 0; i < $CLIENT_COUNT; ++i)); do
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cp -v "${TEMP_DIR}/${WGNAME}client${i}.conf" "${CONFIG_OUTPUT_DIRECTORY}/"
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done
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echo "Removing temporary directory..."
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rm -rvf "$TEMP_DIR"
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echo "Done. Configs should exist at \"$CONFIG_OUTPUT_DIRECTORY\" ."
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