feat: Add support for reflecting STUN requests from unbound clients.

Author: xicilion

include/juice/juice.h

@@ -64,15 +64,15 @@ typedef void (*juice_cb_gathering_done_t)(juice_agent_t *agent, void *user_ptr);
 typedef void (*juice_cb_recv_t)(juice_agent_t *agent, const char *data, size_t size,
                                 void *user_ptr);
 
-typedef struct juice_mux_incoming {
+typedef struct juice_mux_binding_request {
 	const char *local_ufrag;
 	const char *remote_ufrag;
 
 	const char *address;
 	uint16_t port;
-} juice_mux_incoming_t;
+} juice_mux_binding_request_t;
 
-typedef void (*juice_cb_mux_incoming_t)(const juice_mux_incoming_t *info, void *user_ptr);
+typedef void (*juice_cb_mux_incoming_t)(const juice_mux_binding_request_t *info, void *user_ptr);
 
 typedef struct juice_turn_server {
 	const char *host;
@@ -129,7 +129,6 @@ JUICE_EXPORT int juice_get_selected_addresses(juice_agent_t *agent, char *local,
 JUICE_EXPORT int juice_set_local_ice_attributes(juice_agent_t *agent, const char *ufrag, const char *pwd);
 JUICE_EXPORT const char *juice_state_to_string(juice_state_t state);
 JUICE_EXPORT int juice_mux_listen(const char *bind_address, int local_port, juice_cb_mux_incoming_t cb, void *user_ptr);
-JUICE_EXPORT int juice_mux_stop_listen(const char *bind_address, int local_port);
 
 // ICE server
 

src/conn.c

@@ -248,7 +248,7 @@ int conn_get_addrs(juice_agent_t *agent, addr_record_t *records, size_t size) {
 	return get_mode_entry(agent)->get_addrs_func(agent, records, size);
 }
 
-int juice_mux_stop_listen(const char *bind_address, int local_port) {
+static int juice_mux_stop_listen(const char *bind_address, int local_port) {
     (void)bind_address;
     (void)local_port;
 
@@ -277,6 +277,9 @@ int juice_mux_stop_listen(const char *bind_address, int local_port) {
 
 int juice_mux_listen(const char *bind_address, int local_port, juice_cb_mux_incoming_t cb, void *user_ptr)
 {
+	if (!cb)
+		return juice_mux_stop_listen(bind_address, local_port);
+
 	conn_mode_entry_t *entry = &mode_entries[JUICE_CONCURRENCY_MODE_MUX];
 
 	udp_socket_config_t config;

src/conn_mux.c

@@ -305,7 +305,7 @@ static juice_agent_t *lookup_agent(conn_registry_t *registry, char *buf, size_t
 				return NULL;
 			}
 
-			juice_mux_incoming_t incoming_info;
+			juice_mux_binding_request_t incoming_info;
 
 			incoming_info.local_ufrag = local_ufrag;
 			incoming_info.remote_ufrag = separator + 1;