Work-in-progress, untested, naive peer exchange. Intended to be disabled by default by a setting.

src/ssb.h

@@ -28,6 +28,8 @@ enum
 	k_ssb_rpc_flag_new_request = 0x10,
 
 	k_ssb_blob_bytes_max = 5 * 1024 * 1024,
+
+	k_ssb_peer_exchange_expires_seconds = 60 * 60,
 };
 
 /**
@@ -313,6 +315,15 @@ void tf_ssb_visit_broadcasts(tf_ssb_t* ssb,
 	void (*callback)(const char* host, const struct sockaddr_in* addr, tf_ssb_broadcast_origin_t origin, tf_ssb_connection_t* tunnel, const uint8_t* pub, void* user_data),
 	void* user_data);
 
+/**
+** Add a broadcast entry.
+** @param ssb The SSB instance.
+** @param connection The connection string to add.
+** @param origin The origin of the broadcast entry.
+** @param expires_seconds How long the broadcast entry should last.
+*/
+void tf_ssb_add_broadcast(tf_ssb_t* ssb, const char* connection, tf_ssb_broadcast_origin_t origin, int64_t expires_seconds);
+
 /**
 ** Get the identities of all active connections.
 ** @param ssb The SSB instance.
@@ -989,6 +1000,20 @@ bool tf_ssb_is_replicator(tf_ssb_t* ssb);
 */
 void tf_ssb_set_is_replicator(tf_ssb_t* ssb, bool is_replicator);
 
+/**
+** Get whether the running server participates in peer exchange.
+** @param ssb The SSB instance.
+** @return True if the server participates in peer exchange.
+*/
+bool tf_ssb_is_peer_exchange(tf_ssb_t* ssb);
+
+/**
+** Set whether the running server participates in peer exchange.
+** @param ssb The SSB instance.
+** @param is_peer_exchange Whether to participate in peer exchange.
+*/
+void tf_ssb_set_is_peer_exchange(tf_ssb_t* ssb, bool is_peer_exchange);
+
 /**
 ** Get the name of the room hosted by the running server.
 ** @param ssb The SSB instance.