gecko-dev/media/mtransport/nricectx.h

/* -*- 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

// Some of this code is cut-and-pasted from nICEr. Copyright is:

/*
Copyright (c) 2007, Adobe Systems, Incorporated
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* Neither the name of Adobe Systems, Network Resonance nor the names of its
  contributors may be used to endorse or promote products derived from
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/* 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

// This is a wrapper around the nICEr ICE stack
#ifndef nricectx_h__
#define nricectx_h__

#include <memory>
#include <string>
#include <vector>
#include <map>

#include "sigslot.h"

#include "prnetdb.h"

#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsIEventTarget.h"
#include "nsTArray.h"
#include "mozilla/Maybe.h"

#include "m_cpp_utils.h"
#include "nricestunaddr.h"
#include "nricemediastream.h"

typedef struct nr_ice_ctx_ nr_ice_ctx;
typedef struct nr_ice_peer_ctx_ nr_ice_peer_ctx;
typedef struct nr_ice_media_stream_ nr_ice_media_stream;
typedef struct nr_ice_handler_ nr_ice_handler;
typedef struct nr_ice_handler_vtbl_ nr_ice_handler_vtbl;
typedef struct nr_ice_candidate_ nr_ice_candidate;
typedef struct nr_ice_cand_pair_ nr_ice_cand_pair;
typedef struct nr_ice_stun_server_ nr_ice_stun_server;
typedef struct nr_ice_turn_server_ nr_ice_turn_server;
typedef struct nr_resolver_ nr_resolver;
typedef struct nr_proxy_tunnel_config_ nr_proxy_tunnel_config;

typedef void* NR_SOCKET;

namespace mozilla {

class NrSocketProxyConfig;

class NrIceMediaStream;

extern const char kNrIceTransportUdp[];
extern const char kNrIceTransportTcp[];
extern const char kNrIceTransportTls[];

class NrIceStunServer {
 public:
  explicit NrIceStunServer(const PRNetAddr& addr) : has_addr_(true) {
    memcpy(&addr_, &addr, sizeof(addr));
  }

  // The main function to use. Will take either an address or a hostname.
  static UniquePtr<NrIceStunServer> Create(
      const std::string& addr, uint16_t port,
      const char* transport = kNrIceTransportUdp) {
    UniquePtr<NrIceStunServer> server(new NrIceStunServer(transport));

    nsresult rv = server->Init(addr, port);
    if (NS_FAILED(rv)) return nullptr;

    return server;
  }

  nsresult ToNicerStunStruct(nr_ice_stun_server* server) const;

 protected:
  explicit NrIceStunServer(const char* transport)
      : addr_(), transport_(transport) {}

  nsresult Init(const std::string& addr, uint16_t port) {
    PRStatus status = PR_StringToNetAddr(addr.c_str(), &addr_);
    if (status == PR_SUCCESS) {
      // Parseable as an address
      addr_.inet.port = PR_htons(port);
      port_ = port;
      has_addr_ = true;
      return NS_OK;
    } else if (addr.size() < 256) {
      // Apparently this is a hostname.
      host_ = addr;
      port_ = port;
      has_addr_ = false;
      return NS_OK;
    }

    return NS_ERROR_FAILURE;
  }

  bool has_addr_;
  std::string host_;
  uint16_t port_;
  PRNetAddr addr_;
  std::string transport_;
};

class NrIceTurnServer : public NrIceStunServer {
 public:
  static UniquePtr<NrIceTurnServer> Create(
      const std::string& addr, uint16_t port, const std::string& username,
      const std::vector<unsigned char>& password,
      const char* transport = kNrIceTransportUdp) {
    UniquePtr<NrIceTurnServer> server(
        new NrIceTurnServer(username, password, transport));

    nsresult rv = server->Init(addr, port);
    if (NS_FAILED(rv)) return nullptr;

    return server;
  }

  nsresult ToNicerTurnStruct(nr_ice_turn_server* server) const;

 private:
  NrIceTurnServer(const std::string& username,
                  const std::vector<unsigned char>& password,
                  const char* transport)
      : NrIceStunServer(transport), username_(username), password_(password) {}

  std::string username_;
  std::vector<unsigned char> password_;
};

class TestNat;

class NrIceStats {
 public:
  uint16_t stun_retransmits = 0;
  uint16_t turn_401s = 0;
  uint16_t turn_403s = 0;
  uint16_t turn_438s = 0;
};

class NrIceCtx {
 public:
  enum ConnectionState {
    ICE_CTX_INIT,
    ICE_CTX_CHECKING,
    ICE_CTX_CONNECTED,
    ICE_CTX_COMPLETED,
    ICE_CTX_FAILED,
    ICE_CTX_DISCONNECTED,
    ICE_CTX_CLOSED
  };

  enum GatheringState {
    ICE_CTX_GATHER_INIT,
    ICE_CTX_GATHER_STARTED,
    ICE_CTX_GATHER_COMPLETE
  };

  enum Controlling { ICE_CONTROLLING, ICE_CONTROLLED };

  enum Policy { ICE_POLICY_RELAY, ICE_POLICY_NO_HOST, ICE_POLICY_ALL };

  struct NatSimulatorConfig {
    bool mBlockTcp = false;
    bool mBlockUdp = false;
    nsCString mMappingType = "ENDPOINT_INDEPENDENT"_ns;
    nsCString mFilteringType = "ENDPOINT_INDEPENDENT"_ns;
  };

  struct Config {
    NrIceCtx::Policy mPolicy = NrIceCtx::ICE_POLICY_ALL;
    Maybe<NatSimulatorConfig> mNatSimulatorConfig;
  };

  static RefPtr<NrIceCtx> Create(const std::string& aName,
                                 const Config& aConfig);

  RefPtr<NrIceMediaStream> CreateStream(const std::string& id,
                                        const std::string& name,
                                        int components);
  void DestroyStream(const std::string& id);

  struct GlobalConfig {
    bool mAllowLinkLocal = false;
    bool mAllowLoopback = false;
    bool mTcpEnabled = true;
    int mStunClientMaxTransmits = 7;
    int mTrickleIceGracePeriod = 5000;
    int mIceTcpSoSockCount = 3;
    int mIceTcpListenBacklog = 10;
    nsCString mForceNetInterface;
  };

  // initialize ICE globals, crypto, and logging
  static void InitializeGlobals(const GlobalConfig& aConfig);

  void SetTargetForDefaultLocalAddressLookup(const std::string& target_ip,
                                             uint16_t target_port);

  // static GetStunAddrs for use in parent process to support
  // sandboxing restrictions
  static nsTArray<NrIceStunAddr> GetStunAddrs();
  void SetStunAddrs(const nsTArray<NrIceStunAddr>& addrs);

  bool Initialize();

  int SetNat(const RefPtr<TestNat>& aNat);

  // Deinitialize all ICE global state. Used only for testing.
  static void internal_DeinitializeGlobal();

  // Divide some timers to faster testing. Used only for testing.
  void internal_SetTimerAccelarator(int divider);

  nr_ice_ctx* ctx() { return ctx_; }
  nr_ice_peer_ctx* peer() { return peer_; }

  // Testing only.
  void destroy_peer_ctx();

  RefPtr<NrIceMediaStream> GetStream(const std::string& id) {
    auto it = streams_.find(id);
    if (it != streams_.end()) {
      return it->second;
    }
    return nullptr;
  }

  std::vector<RefPtr<NrIceMediaStream>> GetStreams() const {
    std::vector<RefPtr<NrIceMediaStream>> result;
    for (auto& idAndStream : streams_) {
      result.push_back(idAndStream.second);
    }
    return result;
  }

  bool HasStreamsToConnect() const;

  // The name of the ctx
  const std::string& name() const { return name_; }

  // Current state
  ConnectionState connection_state() const { return connection_state_; }

  // Current state
  GatheringState gathering_state() const { return gathering_state_; }

  // Get the global attributes
  std::vector<std::string> GetGlobalAttributes();

  // Set the other side's global attributes
  nsresult ParseGlobalAttributes(std::vector<std::string> attrs);

  // Set whether we are controlling or not.
  nsresult SetControlling(Controlling controlling);

  Controlling GetControlling();

  // Set the STUN servers. Must be called before StartGathering
  // (if at all).
  nsresult SetStunServers(const std::vector<NrIceStunServer>& stun_servers);

  // Set the TURN servers. Must be called before StartGathering
  // (if at all).
  nsresult SetTurnServers(const std::vector<NrIceTurnServer>& turn_servers);

  // Provide the resolution provider. Must be called before
  // StartGathering.
  nsresult SetResolver(nr_resolver* resolver);

  // Provide the proxy address. Must be called before
  // StartGathering.
  nsresult SetProxyConfig(NrSocketProxyConfig&& config);

  const std::shared_ptr<NrSocketProxyConfig>& GetProxyConfig() {
    return proxy_config_;
  }

  void SetCtxFlags(bool default_route_only);

  // Start ICE gathering
  nsresult StartGathering(bool default_route_only,
                          bool obfuscate_host_addresses);

  // Start checking
  nsresult StartChecks();

  // Notify that the network has gone online/offline
  void UpdateNetworkState(bool online);

  // Finalize the ICE negotiation. I.e., there will be no
  // more forking.
  nsresult Finalize();

  void AccumulateStats(const NrIceStats& stats);
  NrIceStats Destroy();

  // Are we trickling?
  bool generating_trickle() const { return trickle_; }

  // Signals to indicate events. API users can (and should)
  // register for these.
  sigslot::signal2<NrIceCtx*, NrIceCtx::GatheringState>
      SignalGatheringStateChange;
  sigslot::signal2<NrIceCtx*, NrIceCtx::ConnectionState>
      SignalConnectionStateChange;

  // The thread to direct method calls to
  nsCOMPtr<nsIEventTarget> thread() { return sts_target_; }

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(NrIceCtx)

 private:
  NrIceCtx(const std::string& name, const Config& aConfig);

  virtual ~NrIceCtx();

  DISALLOW_COPY_ASSIGN(NrIceCtx);

  // Callbacks for nICEr
  static void gather_cb(NR_SOCKET s, int h, void* arg);  // ICE gather complete

  // Handler implementation
  static int select_pair(void* obj, nr_ice_media_stream* stream,
                         int component_id, nr_ice_cand_pair** potentials,
                         int potential_ct);
  static int stream_ready(void* obj, nr_ice_media_stream* stream);
  static int stream_failed(void* obj, nr_ice_media_stream* stream);
  static int ice_checking(void* obj, nr_ice_peer_ctx* pctx);
  static int ice_connected(void* obj, nr_ice_peer_ctx* pctx);
  static int ice_disconnected(void* obj, nr_ice_peer_ctx* pctx);
  static int msg_recvd(void* obj, nr_ice_peer_ctx* pctx,
                       nr_ice_media_stream* stream, int component_id,
                       unsigned char* msg, int len);
  static void trickle_cb(void* arg, nr_ice_ctx* ctx,
                         nr_ice_media_stream* stream, int component_id,
                         nr_ice_candidate* candidate);

  // Find a media stream by stream ptr. Gross
  RefPtr<NrIceMediaStream> FindStream(nr_ice_media_stream* stream);

  // Set the state
  void SetConnectionState(ConnectionState state);

  // Set the state
  void SetGatheringState(GatheringState state);

  void GenerateObfuscatedAddress(nr_ice_candidate* candidate,
                                 std::string* mdns_address,
                                 std::string* actual_address);

  ConnectionState connection_state_;
  GatheringState gathering_state_;
  const std::string name_;
  bool ice_controlling_set_;
  std::map<std::string, RefPtr<NrIceMediaStream>> streams_;
  nr_ice_ctx* ctx_;
  nr_ice_peer_ctx* peer_;
  nr_ice_handler_vtbl* ice_handler_vtbl_;  // Must be pointer
  nr_ice_handler* ice_handler_;            // Must be pointer
  bool trickle_;
  nsCOMPtr<nsIEventTarget> sts_target_;  // The thread to run on
  Config config_;
  RefPtr<TestNat> nat_;
  std::shared_ptr<NrSocketProxyConfig> proxy_config_;
  bool obfuscate_host_addresses_;
  std::map<std::string, std::string> obfuscated_host_addresses_;
};

}  // namespace mozilla
#endif