415 lines
16 KiB
C++
415 lines
16 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_VIRTUAL_SOCKET_SERVER_H_
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#define RTC_BASE_VIRTUAL_SOCKET_SERVER_H_
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#include <deque>
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#include <map>
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#include <vector>
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#include "rtc_base/checks.h"
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#include "rtc_base/constructor_magic.h"
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#include "rtc_base/deprecated/recursive_critical_section.h"
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#include "rtc_base/event.h"
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#include "rtc_base/fake_clock.h"
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#include "rtc_base/message_handler.h"
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#include "rtc_base/socket_server.h"
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namespace rtc {
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class Packet;
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class VirtualSocket;
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class SocketAddressPair;
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// Simulates a network in the same manner as a loopback interface. The
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// interface can create as many addresses as you want. All of the sockets
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// created by this network will be able to communicate with one another, unless
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// they are bound to addresses from incompatible families.
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class VirtualSocketServer : public SocketServer, public sigslot::has_slots<> {
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public:
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VirtualSocketServer();
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// This constructor needs to be used if the test uses a fake clock and
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// ProcessMessagesUntilIdle, since ProcessMessagesUntilIdle needs a way of
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// advancing time.
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explicit VirtualSocketServer(ThreadProcessingFakeClock* fake_clock);
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~VirtualSocketServer() override;
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// The default route indicates which local address to use when a socket is
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// bound to the 'any' address, e.g. 0.0.0.0.
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IPAddress GetDefaultRoute(int family);
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void SetDefaultRoute(const IPAddress& from_addr);
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// Limits the network bandwidth (maximum bytes per second). Zero means that
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// all sends occur instantly. Defaults to 0.
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uint32_t bandwidth() const { return bandwidth_; }
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void set_bandwidth(uint32_t bandwidth) { bandwidth_ = bandwidth; }
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// Limits the amount of data which can be in flight on the network without
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// packet loss (on a per sender basis). Defaults to 64 KB.
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uint32_t network_capacity() const { return network_capacity_; }
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void set_network_capacity(uint32_t capacity) { network_capacity_ = capacity; }
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// The amount of data which can be buffered by tcp on the sender's side
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uint32_t send_buffer_capacity() const { return send_buffer_capacity_; }
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void set_send_buffer_capacity(uint32_t capacity) {
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send_buffer_capacity_ = capacity;
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}
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// The amount of data which can be buffered by tcp on the receiver's side
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uint32_t recv_buffer_capacity() const { return recv_buffer_capacity_; }
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void set_recv_buffer_capacity(uint32_t capacity) {
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recv_buffer_capacity_ = capacity;
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}
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// Controls the (transit) delay for packets sent in the network. This does
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// not inclue the time required to sit in the send queue. Both of these
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// values are measured in milliseconds. Defaults to no delay.
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uint32_t delay_mean() const { return delay_mean_; }
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uint32_t delay_stddev() const { return delay_stddev_; }
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uint32_t delay_samples() const { return delay_samples_; }
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void set_delay_mean(uint32_t delay_mean) { delay_mean_ = delay_mean; }
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void set_delay_stddev(uint32_t delay_stddev) { delay_stddev_ = delay_stddev; }
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void set_delay_samples(uint32_t delay_samples) {
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delay_samples_ = delay_samples;
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}
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// If the (transit) delay parameters are modified, this method should be
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// called to recompute the new distribution.
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void UpdateDelayDistribution();
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// Controls the (uniform) probability that any sent packet is dropped. This
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// is separate from calculations to drop based on queue size.
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double drop_probability() { return drop_prob_; }
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void set_drop_probability(double drop_prob) {
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RTC_DCHECK_GE(drop_prob, 0.0);
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RTC_DCHECK_LE(drop_prob, 1.0);
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drop_prob_ = drop_prob;
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}
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// If |blocked| is true, subsequent attempts to send will result in -1 being
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// returned, with the socket error set to EWOULDBLOCK.
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//
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// If this method is later called with |blocked| set to false, any sockets
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// that previously failed to send with EWOULDBLOCK will emit SignalWriteEvent.
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//
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// This can be used to simulate the send buffer on a network interface being
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// full, and test functionality related to EWOULDBLOCK/SignalWriteEvent.
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void SetSendingBlocked(bool blocked);
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// SocketFactory:
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Socket* CreateSocket(int family, int type) override;
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AsyncSocket* CreateAsyncSocket(int family, int type) override;
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// SocketServer:
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void SetMessageQueue(Thread* queue) override;
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bool Wait(int cms, bool process_io) override;
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void WakeUp() override;
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void SetDelayOnAddress(const rtc::SocketAddress& address, int delay_ms) {
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delay_by_ip_[address.ipaddr()] = delay_ms;
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}
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// Used by TurnPortTest and TcpPortTest (for example), to mimic a case where
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// a proxy returns the local host address instead of the original one the
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// port was bound against. Please see WebRTC issue 3927 for more detail.
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//
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// If SetAlternativeLocalAddress(A, B) is called, then when something
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// attempts to bind a socket to address A, it will get a socket bound to
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// address B instead.
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void SetAlternativeLocalAddress(const rtc::IPAddress& address,
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const rtc::IPAddress& alternative);
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typedef std::pair<double, double> Point;
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typedef std::vector<Point> Function;
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static Function* CreateDistribution(uint32_t mean,
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uint32_t stddev,
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uint32_t samples);
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// Similar to Thread::ProcessMessages, but it only processes messages until
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// there are no immediate messages or pending network traffic. Returns false
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// if Thread::Stop() was called.
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bool ProcessMessagesUntilIdle();
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// Sets the next port number to use for testing.
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void SetNextPortForTesting(uint16_t port);
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// Close a pair of Tcp connections by addresses. Both connections will have
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// its own OnClose invoked.
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bool CloseTcpConnections(const SocketAddress& addr_local,
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const SocketAddress& addr_remote);
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// Number of packets that clients have attempted to send through this virtual
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// socket server. Intended to be used for test assertions.
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uint32_t sent_packets() const { return sent_packets_; }
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// For testing purpose only. Fired when a client socket is created.
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sigslot::signal1<VirtualSocket*> SignalSocketCreated;
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protected:
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// Returns a new IP not used before in this network.
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IPAddress GetNextIP(int family);
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uint16_t GetNextPort();
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VirtualSocket* CreateSocketInternal(int family, int type);
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// Binds the given socket to addr, assigning and IP and Port if necessary
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int Bind(VirtualSocket* socket, SocketAddress* addr);
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// Binds the given socket to the given (fully-defined) address.
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int Bind(VirtualSocket* socket, const SocketAddress& addr);
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// Find the socket bound to the given address
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VirtualSocket* LookupBinding(const SocketAddress& addr);
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int Unbind(const SocketAddress& addr, VirtualSocket* socket);
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// Adds a mapping between this socket pair and the socket.
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void AddConnection(const SocketAddress& client,
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const SocketAddress& server,
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VirtualSocket* socket);
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// Find the socket pair corresponding to this server address.
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VirtualSocket* LookupConnection(const SocketAddress& client,
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const SocketAddress& server);
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void RemoveConnection(const SocketAddress& client,
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const SocketAddress& server);
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// Connects the given socket to the socket at the given address
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int Connect(VirtualSocket* socket,
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const SocketAddress& remote_addr,
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bool use_delay);
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// Sends a disconnect message to the socket at the given address
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bool Disconnect(VirtualSocket* socket);
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// Sends the given packet to the socket at the given address (if one exists).
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int SendUdp(VirtualSocket* socket,
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const char* data,
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size_t data_size,
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const SocketAddress& remote_addr);
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// Moves as much data as possible from the sender's buffer to the network
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void SendTcp(VirtualSocket* socket);
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// Places a packet on the network.
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void AddPacketToNetwork(VirtualSocket* socket,
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VirtualSocket* recipient,
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int64_t cur_time,
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const char* data,
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size_t data_size,
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size_t header_size,
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bool ordered);
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// Removes stale packets from the network
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void PurgeNetworkPackets(VirtualSocket* socket, int64_t cur_time);
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// Computes the number of milliseconds required to send a packet of this size.
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uint32_t SendDelay(uint32_t size);
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// If the delay has been set for the address of the socket, returns the set
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// delay. Otherwise, returns a random transit delay chosen from the
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// appropriate distribution.
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uint32_t GetTransitDelay(Socket* socket);
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// Basic operations on functions. Those that return a function also take
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// ownership of the function given (and hence, may modify or delete it).
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static Function* Accumulate(Function* f);
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static Function* Invert(Function* f);
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static Function* Resample(Function* f,
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double x1,
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double x2,
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uint32_t samples);
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static double Evaluate(Function* f, double x);
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// Null out our message queue if it goes away. Necessary in the case where
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// our lifetime is greater than that of the thread we are using, since we
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// try to send Close messages for all connected sockets when we shutdown.
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void OnMessageQueueDestroyed() { msg_queue_ = nullptr; }
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// Determine if two sockets should be able to communicate.
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// We don't (currently) specify an address family for sockets; instead,
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// the currently bound address is used to infer the address family.
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// Any socket that is not explicitly bound to an IPv4 address is assumed to be
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// dual-stack capable.
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// This function tests if two addresses can communicate, as well as the
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// sockets to which they may be bound (the addresses may or may not yet be
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// bound to the sockets).
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// First the addresses are tested (after normalization):
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// If both have the same family, then communication is OK.
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// If only one is IPv4 then false, unless the other is bound to ::.
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// This applies even if the IPv4 address is 0.0.0.0.
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// The socket arguments are optional; the sockets are checked to see if they
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// were explicitly bound to IPv6-any ('::'), and if so communication is
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// permitted.
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// NB: This scheme doesn't permit non-dualstack IPv6 sockets.
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static bool CanInteractWith(VirtualSocket* local, VirtualSocket* remote);
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private:
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friend class VirtualSocket;
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// Sending was previously blocked, but now isn't.
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sigslot::signal0<> SignalReadyToSend;
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typedef std::map<SocketAddress, VirtualSocket*> AddressMap;
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typedef std::map<SocketAddressPair, VirtualSocket*> ConnectionMap;
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// May be null if the test doesn't use a fake clock, or it does but doesn't
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// use ProcessMessagesUntilIdle.
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ThreadProcessingFakeClock* fake_clock_ = nullptr;
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// Used to implement Wait/WakeUp.
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Event wakeup_;
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Thread* msg_queue_;
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bool stop_on_idle_;
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in_addr next_ipv4_;
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in6_addr next_ipv6_;
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uint16_t next_port_;
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AddressMap* bindings_;
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ConnectionMap* connections_;
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IPAddress default_route_v4_;
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IPAddress default_route_v6_;
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uint32_t bandwidth_;
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uint32_t network_capacity_;
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uint32_t send_buffer_capacity_;
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uint32_t recv_buffer_capacity_;
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uint32_t delay_mean_;
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uint32_t delay_stddev_;
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uint32_t delay_samples_;
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// Used for testing.
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uint32_t sent_packets_ = 0;
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std::map<rtc::IPAddress, int> delay_by_ip_;
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std::map<rtc::IPAddress, rtc::IPAddress> alternative_address_mapping_;
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std::unique_ptr<Function> delay_dist_;
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RecursiveCriticalSection delay_crit_;
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double drop_prob_;
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bool sending_blocked_ = false;
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RTC_DISALLOW_COPY_AND_ASSIGN(VirtualSocketServer);
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};
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// Implements the socket interface using the virtual network. Packets are
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// passed as messages using the message queue of the socket server.
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class VirtualSocket : public AsyncSocket,
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public MessageHandlerAutoCleanup,
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public sigslot::has_slots<> {
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public:
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VirtualSocket(VirtualSocketServer* server, int family, int type, bool async);
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~VirtualSocket() override;
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SocketAddress GetLocalAddress() const override;
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SocketAddress GetRemoteAddress() const override;
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int Bind(const SocketAddress& addr) override;
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int Connect(const SocketAddress& addr) override;
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int Close() override;
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int Send(const void* pv, size_t cb) override;
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int SendTo(const void* pv, size_t cb, const SocketAddress& addr) override;
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int Recv(void* pv, size_t cb, int64_t* timestamp) override;
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int RecvFrom(void* pv,
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size_t cb,
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SocketAddress* paddr,
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int64_t* timestamp) override;
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int Listen(int backlog) override;
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VirtualSocket* Accept(SocketAddress* paddr) override;
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int GetError() const override;
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void SetError(int error) override;
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ConnState GetState() const override;
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int GetOption(Option opt, int* value) override;
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int SetOption(Option opt, int value) override;
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void OnMessage(Message* pmsg) override;
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bool was_any() { return was_any_; }
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void set_was_any(bool was_any) { was_any_ = was_any; }
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// For testing purpose only. Fired when client socket is bound to an address.
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sigslot::signal2<VirtualSocket*, const SocketAddress&> SignalAddressReady;
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private:
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struct NetworkEntry {
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size_t size;
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int64_t done_time;
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};
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typedef std::deque<SocketAddress> ListenQueue;
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typedef std::deque<NetworkEntry> NetworkQueue;
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typedef std::vector<char> SendBuffer;
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typedef std::list<Packet*> RecvBuffer;
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typedef std::map<Option, int> OptionsMap;
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int InitiateConnect(const SocketAddress& addr, bool use_delay);
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void CompleteConnect(const SocketAddress& addr, bool notify);
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int SendUdp(const void* pv, size_t cb, const SocketAddress& addr);
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int SendTcp(const void* pv, size_t cb);
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// Used by server sockets to set the local address without binding.
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void SetLocalAddress(const SocketAddress& addr);
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void OnSocketServerReadyToSend();
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VirtualSocketServer* server_;
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int type_;
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bool async_;
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ConnState state_;
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int error_;
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SocketAddress local_addr_;
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SocketAddress remote_addr_;
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// Pending sockets which can be Accepted
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ListenQueue* listen_queue_;
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// Data which tcp has buffered for sending
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SendBuffer send_buffer_;
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// Set to false if the last attempt to send resulted in EWOULDBLOCK.
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// Set back to true when the socket can send again.
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bool ready_to_send_ = true;
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// Critical section to protect the recv_buffer and queue_
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RecursiveCriticalSection crit_;
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// Network model that enforces bandwidth and capacity constraints
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NetworkQueue network_;
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size_t network_size_;
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// The scheduled delivery time of the last packet sent on this socket.
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// It is used to ensure ordered delivery of packets sent on this socket.
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int64_t last_delivery_time_ = 0;
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// Data which has been received from the network
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RecvBuffer recv_buffer_;
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// The amount of data which is in flight or in recv_buffer_
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size_t recv_buffer_size_;
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// Is this socket bound?
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bool bound_;
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// When we bind a socket to Any, VSS's Bind gives it another address. For
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// dual-stack sockets, we want to distinguish between sockets that were
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// explicitly given a particular address and sockets that had one picked
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// for them by VSS.
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bool was_any_;
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// Store the options that are set
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OptionsMap options_map_;
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friend class VirtualSocketServer;
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};
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} // namespace rtc
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#endif // RTC_BASE_VIRTUAL_SOCKET_SERVER_H_
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