From 0bbf6490f50bef5c21b237cd20e69e5b12a9916e Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Fri, 12 May 2017 20:34:16 +0200
Subject: [PATCH] setsockopt: allow SO_BROADCAST for UDP sockets only

---
 src/api/sockets.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/api/sockets.c b/src/api/sockets.c
index d6cee222..cd4cc7da 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -2852,6 +2852,11 @@ lwip_setsockopt_impl(int s, int level, int optname, const void *optval, socklen_
 #if SO_REUSE
     case SO_REUSEADDR:
 #endif /* SO_REUSE */
+      if ((optname == SO_BROADCAST) &&
+          (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP)) {
+        done_socket(sock);
+        return ENOPROTOOPT;
+      }
       LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB(sock, optlen, int);
       if (*(const int*)optval) {
         ip_set_option(sock->conn->pcb.ip, optname);