Close connections when an I/O hook is configured but not loaded.

2 files changed, 15 insertions, 2 deletions

diff --git a/include/dynref.h b/include/dynref.h
index 6e2e17423..44829164b 100644
--- a/include/dynref.h
+++ b/include/dynref.h
@@ -43,7 +43,7 @@ class CoreExport dynamic_reference_base : public interfacebase, public insp::int
 	ModuleRef creator;
 	dynamic_reference_base(Module* Creator, const std::string& Name);
 	~dynamic_reference_base();
-	inline const std::string& GetProvider() { return name; }
+	inline const std::string& GetProvider() const { return name; }
 	void SetProvider(const std::string& newname);
 
 	/** Set handler to call when the target object becomes available
diff --git a/src/usermanager.cpp b/src/usermanager.cpp
index 4f65994aa..bcb831858 100644
--- a/src/usermanager.cpp
+++ b/src/usermanager.cpp
@@ -149,10 +149,23 @@ void UserManager::AddUser(int socket, ListenSocket* via, irc::sockets::sockaddrs
 	{
 		ListenSocket::IOHookProvRef& iohookprovref = *i;
 		if (!iohookprovref)
+		{
+			if (!iohookprovref.GetProvider().empty())
+			{
+				ServerInstance->Logs->Log("USERS", LOG_DEBUG, "Non-existent I/O hook '%s' in <bind:%s> tag at %s",
+					iohookprovref.GetProvider().c_str(),
+					i == via->iohookprovs.begin() ? "hook" : "ssl",
+					via->bind_tag->getTagLocation().c_str());
+				this->QuitUser(New, "Internal error handling connection");
+				return;
+			}
 			continue;
+		}
 
 		iohookprovref->OnAccept(eh, client, server);
-		// IOHook could have encountered a fatal error, e.g. if the TLS ClientHello was already in the queue and there was no common TLS version
+
+		// IOHook could have encountered a fatal error, e.g. if the TLS ClientHello
+		// was already in the queue and there was no common TLS version.
 		if (!eh->getError().empty())
 		{
 			QuitUser(New, eh->getError());