From 7241f4e67ca034f91bf433349a8346dff5941ec2 Mon Sep 17 00:00:00 2001
From: Yosuke Shimizu <yosuke@wolfssl.com>
Date: Fri, 24 Apr 2026 15:16:39 +0900
Subject: [PATCH] Add warning to make non-registered channelOpenCb visible

---
 src/internal.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/internal.c b/src/internal.c
index d15128de..a74f447e 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -8920,6 +8920,12 @@ static int DoChannelOpen(WOLFSSH* ssh,
             if (ssh->ctx->channelOpenCb) {
                 ret = ssh->ctx->channelOpenCb(newChannel, ssh->channelOpenCtx);
             }
+            else {
+                WLOG(WS_LOG_WARN, "No channel open callback set "
+                        "(call wolfSSH_CTX_SetChannelOpenCb()), accepting "
+                        "channel open by default; typeId=%u, peerChannelId=%u",
+                        (word32)typeId, peerChannelId);
+            }
             if (ssh->channelListSz == 0)
                 ssh->defaultPeerChannelId = peerChannelId;
         #ifdef WOLFSSH_FWD