wg-quick: add intentionally undocumented userspace implementation knob

This knob might disappear at some point, and we don't want to encourage
its use, so it's not being documented, but this should help with
development of new implementations.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/src/wg-quick/darwin.bash b/src/wg-quick/darwin.bash
index 4a3240c27fd5a0f82fcf94516b841ce91995e173..0eef3d94c35eeb196ade9d55ddd61477b8e0e3bc 100755 (executable)
--- a/src/wg-quick/darwin.bash
+++ b/src/wg-quick/darwin.bash
@@ -101,7 +101,7 @@ get_real_interface() {
 add_if() {
        export WG_DARWIN_UTUN_NAME_FILE="/var/run/wireguard/$INTERFACE.name"
        mkdir -m 0700 -p "/var/run/wireguard/"
-       cmd wireguard-go utun
+       cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" utun
        get_real_interface
 }
 

diff --git a/src/wg-quick/linux.bash b/src/wg-quick/linux.bash
index 38ccad239c462ba0eeed0826d120d2292396dd1a..9139e7f68ea06583db607ee871f53cf9d9d3a8db 100755 (executable)
--- a/src/wg-quick/linux.bash
+++ b/src/wg-quick/linux.bash
@@ -86,9 +86,9 @@ add_if() {
        local ret
        if ! cmd ip link add "$INTERFACE" type wireguard; then
                ret=$?
-               [[ -e /sys/module/wireguard ]] || ! command -v wireguard-go >/dev/null && return $ret
+               [[ -e /sys/module/wireguard ]] || ! command -v "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" >/dev/null && exit $ret
                echo "[!] Missing WireGuard kernel module. Falling back to slow userspace implementation."
-               cmd wireguard-go "$INTERFACE"
+               cmd "${WG_QUICK_USERSPACE_IMPLEMENTATION:-wireguard-go}" "$INTERFACE"
        fi
 }