Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

toxcore/LAN_discovery.h

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+/* SPDX-License-Identifier: GPL-3.0-or-later
+ * Copyright © 2016-2018 The TokTok team.
+ * Copyright © 2013 Tox project.
+ */
+
+/**
+ * LAN discovery implementation.
+ */
+#ifndef C_TOXCORE_TOXCORE_LAN_DISCOVERY_H
+#define C_TOXCORE_TOXCORE_LAN_DISCOVERY_H
+
+#include "network.h"
+
+/**
+ * Interval in seconds between LAN discovery packet sending.
+ */
+#define LAN_DISCOVERY_INTERVAL         10
+
+typedef struct Broadcast_Info Broadcast_Info;
+
+/**
+ * Send a LAN discovery pcaket to the broadcast address with port port.
+ *
+ * @return true on success, false on failure.
+ */
+non_null()
+bool lan_discovery_send(const Networking_Core *net, const Broadcast_Info *broadcast, const uint8_t *dht_pk,
+                        uint16_t port);
+
+/**
+ * Discovers broadcast devices and IP addresses.
+ */
+non_null()
+Broadcast_Info *lan_discovery_init(const Network *ns);
+
+/**
+ * Free all resources associated with the broadcast info.
+ */
+nullable(1)
+void lan_discovery_kill(Broadcast_Info *broadcast);
+
+/**
+ * Is IP a local ip or not.
+ */
+non_null()
+bool ip_is_local(const IP *ip);
+
+/**
+ * Checks if a given IP isn't routable.
+ *
+ * @return true if ip is a LAN ip, false if it is not.
+ */
+non_null()
+bool ip_is_lan(const IP *ip);
+
+#endif // C_TOXCORE_TOXCORE_LAN_DISCOVERY_H