/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

// Original author: ekr@rtfm.com

#ifndef stunserver_h__

#define stunserver_h__

#include <map>

#include <string>

#include "prio.h"

#include "nsError.h"

#include "mozilla/UniquePtr.h"

typedef struct nr_stun_server_ctx_ nr_stun_server_ctx;

typedef struct nr_socket_ nr_socket;

typedef struct nr_local_addr_ nr_local_addr;

namespace mozilla {

class TestStunServer {

 public:

  // Generally, you should only call API in this class from the same thread that

  // the initial |GetInstance| call was made from.

  static TestStunServer *GetInstance(int address_family = AF_INET);

  static void ShutdownInstance();

  // |ConfigurePort| will only have an effect if called before the first call

  // to |GetInstance| (possibly following a |ShutdownInstance| call)

  static void ConfigurePort(uint16_t port);

  // AF_INET, AF_INET6

  static UniquePtr<TestStunServer> Create(int address_family);

  virtual ~TestStunServer();

  void SetActive(bool active);

  void SetDelay(uint32_t delay_ms);

  void SetDropInitialPackets(uint32_t count);

  const std::string& addr() const { return listen_addr_; }

  uint16_t port() const { return listen_port_; }

  // These should only be called from the same thread as the initial

  // |GetInstance| call.

  nsresult SetResponseAddr(nr_transport_addr *addr);

  nsresult SetResponseAddr(const std::string& addr, uint16_t port);

  void Reset();

  static const size_t max_stun_message_size = 4096;

  virtual nr_socket* GetReceivingSocket(NR_SOCKET s);

  virtual nr_socket* GetSendingSocket(nr_socket *sock);

 protected:

  TestStunServer()

      : listen_port_(0),

        listen_sock_(nullptr),

        send_sock_(nullptr),

        stun_server_(nullptr),

        active_(true),

        delay_ms_(0),

        initial_ct_(0),

        response_addr_(nullptr),

        timer_handle_(nullptr) {}

  int SetInternalPort(nr_local_addr *addr, uint16_t port);

  int Initialize(int address_family);

  static void readable_cb(NR_SOCKET sock, int how, void *cb_arg);

 private:

  void Process(const uint8_t *msg, size_t len, nr_transport_addr *addr_in, nr_socket *sock);

  virtual int TryOpenListenSocket(nr_local_addr *addr, uint16_t port);

  static void process_cb(NR_SOCKET sock, int how, void *cb_arg);

 protected:

  std::string listen_addr_;

  uint16_t listen_port_;

  nr_socket *listen_sock_;

  nr_socket *send_sock_;

  nr_stun_server_ctx *stun_server_;

 private:

  bool active_;

  uint32_t delay_ms_;

  uint32_t initial_ct_;

  nr_transport_addr *response_addr_;

  void *timer_handle_;

  std::map<std::string, uint32_t> received_ct_;

  static TestStunServer *instance;

  static TestStunServer *instance6;

  static uint16_t instance_port;

};

class TestStunTcpServer: public TestStunServer {

 public:

  static TestStunTcpServer *GetInstance(int address_family);

  static void ShutdownInstance();

  static void ConfigurePort(uint16_t port);

  virtual ~TestStunTcpServer();

  virtual nr_socket* GetReceivingSocket(NR_SOCKET s);

  virtual nr_socket* GetSendingSocket(nr_socket *sock);

 protected:

  TestStunTcpServer() {}

  static void accept_cb(NR_SOCKET sock, int how, void *cb_arg);

 private:

  virtual int TryOpenListenSocket(nr_local_addr *addr, uint16_t port);

  static UniquePtr<TestStunTcpServer> Create(int address_family);

  static TestStunTcpServer *instance;

  static TestStunTcpServer *instance6;

  static uint16_t instance_port;

  std::map<NR_SOCKET, nr_socket*> connections_;

};

} // End of namespace mozilla

#endif