Merge pull request #13668 from benpicco/tools/radvd

tools/radvd: Add script to run radvd on a tun interface

dist/tools/radvd/radvd.conf

@@ -0,0 +1,9 @@
+interface ${TAP}
+{
+    AdvSendAdvert on;
+    prefix ${PREFIX}
+    {
+        AdvOnLink on;
+        AdvAutonomous on;
+    };
+};

dist/tools/radvd/radvd.sh

@@ -0,0 +1,106 @@
+#!/bin/sh
+
+CURRENT_DIR="$(dirname $(readlink -f $0))"
+PIDFILE="/tmp/radvd-${SUDO_USER}.pid"
+
+stop_radvd() {
+    if [ -f "${PIDFILE}" ]; then
+        PID=$(cat ${PIDFILE})
+    fi
+    if [ -n "${PID}" ]; then
+        kill ${PID}
+        rm ${PIDFILE}
+        echo "radvd stopped"
+    fi
+}
+
+start_radvd() {
+    export TAP
+    export PREFIX
+    cat ${CURRENT_DIR}/radvd.conf | envsubst | radvd -C /dev/stdin -u ${SUDO_USER} -p ${PIDFILE}
+
+    if [ $? -ne 0 ]; then
+        echo "radvd failed to start on ${TAP} with prefix ${PREFIX}"
+        exit 1
+    else
+        echo "radvd running on ${TAP}"
+    fi
+}
+
+usage() {
+    echo "usage: $0 [options]" >&2
+    echo "Options:" >&2
+    echo "   -c <tap-device> <prefix>: Start radvd on <tap-device>, advertising <prefix>" >&2
+    echo "   -d, --delete:             Stop radvd" >&2
+}
+
+if ! command -v radvd > /dev/null; then
+    echo "Router Advertisement Daemon 'radvd' not found." >&2
+    echo "Please install 'radvd' on your operating system." >&2
+    exit 1
+fi
+
+while true ; do
+    case "$1" in
+        -c|--create)
+            if [ -n "${COMMAND}" ]; then
+                usage
+                exit 2
+            fi
+            COMMAND="create"
+            shift
+            case "$1" in
+                "")
+                    usage
+                    exit 2 ;;
+                *)
+                    TAP="$1"
+                    shift 1 ;;
+            esac
+            case "$1" in
+                "")
+                    usage
+                    exit 2 ;;
+                *)
+                    PREFIX="$1"
+                    shift 1 ;;
+            esac ;;
+        -d|--delete)
+            if [ -n "${COMMAND}" ]; then
+                usage
+                exit 2
+            fi
+            COMMAND="delete"
+            shift ;;
+        -h|--help)
+            usage
+            exit ;;
+        "")
+            break ;;
+        *)  usage
+            exit 2 ;;
+    esac
+done
+
+if [ -z "${SUDO_USER}" ]; then
+    echo 'Environment variable $SUDO_USER required; Please run with `sudo`'
+    exit 1
+fi
+
+if [ -z "${COMMAND}" ]; then
+    COMMAND="create"
+fi
+
+if [ "${COMMAND}" = 'create' ]; then
+    [ -z "${TAP}" -o -z "${PREFIX}" ] && {
+        usage
+        exit 1
+    }
+    stop_radvd
+    start_radvd || exit 1
+elif [ "${COMMAND}" = 'delete' ]; then
+    stop_radvd || exit 1
+else
+    echo 'unknown command'
+    exit 1
+fi