From a41c2fc67c47750ff602b1dcbdc2b3750e1a1f3b Mon Sep 17 00:00:00 2001
From: aler9 <46489434+aler9@users.noreply.github.com>
Date: Sun, 27 Sep 2020 13:02:36 +0200
Subject: [PATCH] check SETUP mode when reading

---
 client.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/client.go b/client.go
index e0e3d551..031ca0fb 100644
--- a/client.go
+++ b/client.go
@@ -472,6 +472,11 @@ func (c *client) handleRequest(req *gortsplib.Request) error {
 		switch c.state {
 		// play
 		case clientStateInitial, clientStatePrePlay:
+			if th.Mode != nil && *th.Mode != "play" {
+				c.writeResError(cseq, gortsplib.StatusBadRequest, fmt.Errorf("transport header must contain mode=play or not contain a mode"))
+				return errRunTerminate
+			}
+
 			pathConf, err := c.p.conf.checkPathNameAndFindConf(basePath)
 			if err != nil {
 				c.writeResError(cseq, gortsplib.StatusBadRequest, err)