From 73ea4358cbfc36940d95b4436c0d0333e471f460 Mon Sep 17 00:00:00 2001
From: Jason Lyu <xjasonlyu@gmail.com>
Date: Sun, 27 Aug 2023 19:04:22 -0400
Subject: [PATCH] Docker: add options for multicast groups (#290)

---
 Dockerfile           | 1 +
 docker/entrypoint.sh | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/Dockerfile b/Dockerfile
index 3dda97b..1b45243 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -25,6 +25,7 @@ ENV UDP_TIMEOUT=
 ENV TCP_SNDBUF=
 ENV TCP_RCVBUF=
 ENV TCP_AUTO_TUNING=
+ENV MULTICAST_GROUPS=
 ENV EXTRA_COMMANDS=
 ENV TUN_INCLUDED_ROUTES=
 ENV TUN_EXCLUDED_ROUTES=
diff --git a/docker/entrypoint.sh b/docker/entrypoint.sh
index 78571d9..10e9c4c 100644
--- a/docker/entrypoint.sh
+++ b/docker/entrypoint.sh
@@ -81,6 +81,10 @@ run() {
     ARGS="$ARGS --tcp-auto-tuning"
   fi
 
+  if [ -n "$MULTICAST_GROUPS" ]; then
+    ARGS="$ARGS --multicast-groups $MULTICAST_GROUPS"
+  fi
+
   exec tun2socks \
     --loglevel "$LOGLEVEL" \
     --fwmark "$FWMARK" \