gecko-dev/media/mtransport/nr_socket_tcp.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et tw=80 ft=cpp : */
/* 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,
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/*
Copyright (c) 2007, Adobe Systems, Incorporated
Copyright (c) 2013, Mozilla

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modification, are permitted provided that the following conditions are
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* Redistributions of source code must retain the above copyright
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* Redistributions in binary form must reproduce the above copyright
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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*/

#include "nr_socket_tcp.h"

#include "mozilla/ErrorNames.h"

#include "WebrtcTCPSocketWrapper.h"

namespace mozilla {
using namespace net;

using std::shared_ptr;

class NrTcpSocketData {
 public:
  explicit NrTcpSocketData(nsTArray<uint8_t>&& aData)
      : mData(std::move(aData)) {
    MOZ_COUNT_CTOR(NrTcpSocketData);
  }

  MOZ_COUNTED_DTOR(NrTcpSocketData)

  const nsTArray<uint8_t>& GetData() const { return mData; }

 private:
  nsTArray<uint8_t> mData;
};

NrTcpSocket::NrTcpSocket(const shared_ptr<NrSocketProxyConfig>& aConfig)
    : mClosed(false),
      mReadOffset(0),
      mConfig(aConfig),
      mWebrtcTCPSocket(nullptr) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::NrTcpSocket %p\n", this);
}

NrTcpSocket::~NrTcpSocket() {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::~NrTcpSocket %p\n", this);
  MOZ_ASSERT(!mWebrtcTCPSocket, "webrtc TCP socket not null");
}

int NrTcpSocket::create(nr_transport_addr* aAddr) {
  int32_t port;
  nsCString host;

  // Sanity check
  if (nr_transport_addr_get_addrstring_and_port(aAddr, &host, &port)) {
    return R_FAILED;
  }

  if (nr_transport_addr_copy(&my_addr_, aAddr)) {
    return R_FAILED;
  }

  return 0;
}

int NrTcpSocket::connect(nr_transport_addr* aAddr) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::Connect %p\n", this);

  nsCString remote_host;
  int remote_port;

  if (NS_WARN_IF(nr_transport_addr_get_addrstring_and_port(aAddr, &remote_host,
                                                           &remote_port))) {
    return R_FAILED;
  }

  bool use_tls = false;
  if (my_addr_.tls_host[0]) {
    remote_host = my_addr_.tls_host;
    use_tls = true;
  }

  nsCString local_addr;
  int local_port;

  if (NS_WARN_IF(nr_transport_addr_get_addrstring_and_port(
          &my_addr_, &local_addr, &local_port))) {
    return R_FAILED;
  }

  mWebrtcTCPSocket = new WebrtcTCPSocketWrapper(this);

  mWebrtcTCPSocket->AsyncOpen(remote_host, remote_port, local_addr, local_port,
                              use_tls, mConfig);

  // trigger nr_socket_buffered to set write/read callback
  return R_WOULDBLOCK;
}

void NrTcpSocket::close() {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::Close %p\n", this);

  if (mClosed) {
    return;
  }

  mClosed = true;

  // We're not always open at this point.
  if (mWebrtcTCPSocket) {
    mWebrtcTCPSocket->Close();
    mWebrtcTCPSocket = nullptr;
  }
}

int NrTcpSocket::write(const void* aBuffer, size_t aCount, size_t* aWrote) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::Write %p count=%zu\n", this,
        aCount);

  if (mClosed) {
    return R_FAILED;
  }

  if (!aWrote) {
    return R_FAILED;
  }

  if (NS_WARN_IF(!mWebrtcTCPSocket)) {
    return R_FAILED;
  }

  *aWrote = aCount;

  if (aCount > 0) {
    nsTArray<uint8_t> writeData;
    writeData.SetLength(aCount);
    memcpy(writeData.Elements(), aBuffer, aCount);

    mWebrtcTCPSocket->SendWrite(std::move(writeData));
  }

  return 0;
}

int NrTcpSocket::read(void* aBuffer, size_t aCount, size_t* aRead) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::Read %p\n", this);

  if (mClosed) {
    return R_FAILED;
  }

  if (!aRead) {
    return R_FAILED;
  }

  *aRead = 0;

  if (mReadQueue.empty()) {
    return R_WOULDBLOCK;
  }

  while (aCount > 0 && !mReadQueue.empty()) {
    const NrTcpSocketData& data = mReadQueue.front();

    size_t remainingCount = data.GetData().Length() - mReadOffset;
    size_t amountToCopy = std::min(aCount, remainingCount);

    char* buffer = static_cast<char*>(aBuffer) + (*aRead);

    memcpy(buffer, data.GetData().Elements() + mReadOffset, amountToCopy);

    mReadOffset += amountToCopy;
    *aRead += amountToCopy;
    aCount -= amountToCopy;

    if (remainingCount == amountToCopy) {
      mReadOffset = 0;
      mReadQueue.pop_front();
    }
  }

  return 0;
}

int NrTcpSocket::getaddr(nr_transport_addr* aAddr) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::GetAddr %p\n", this);
  return nr_transport_addr_copy(aAddr, &my_addr_);
}

int NrTcpSocket::sendto(const void* aBuffer, size_t aCount, int aFlags,
                        nr_transport_addr* aAddr) {
  // never call this
  MOZ_ASSERT(0);
  return R_FAILED;
}

int NrTcpSocket::recvfrom(void* aBuffer, size_t aCount, size_t* aRead,
                          int aFlags, nr_transport_addr* aAddr) {
  // never call this
  MOZ_ASSERT(0);
  return R_FAILED;
}

int NrTcpSocket::listen(int aBacklog) { return R_INTERNAL; }

int NrTcpSocket::accept(nr_transport_addr* aAddr, nr_socket** aSocket) {
  return R_INTERNAL;
}

// WebrtcTCPSocketCallback
void NrTcpSocket::OnClose(nsresult aReason) {
  nsCString errorName;
  GetErrorName(aReason, errorName);

  r_log(LOG_GENERIC, LOG_ERR, "NrTcpSocket::OnClose %p reason=%u name=%s\n",
        this, static_cast<uint32_t>(aReason), errorName.get());

  close();

  DoCallbacks();
}

void NrTcpSocket::OnConnected(const nsCString& aProxyType) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::OnConnected %p\n", this);
  if (aProxyType != "" && aProxyType != "direct") {
    my_addr_.is_proxied = true;
  }

  DoCallbacks();
}

void NrTcpSocket::OnRead(nsTArray<uint8_t>&& aReadData) {
  r_log(LOG_GENERIC, LOG_DEBUG, "NrTcpSocket::OnRead %p read=%zu\n", this,
        aReadData.Length());

  mReadQueue.emplace_back(std::move(aReadData));

  DoCallbacks();
}

void NrTcpSocket::DoCallbacks() {
  size_t lastCount = -1;
  size_t currentCount = 0;
  while ((poll_flags() & PR_POLL_READ) != 0 &&
         // Make sure whatever is reading knows we're closed. This doesn't need
         // to happen for writes since ICE doesn't like a failing writable.
         (mClosed || (currentCount = CountUnreadBytes()) > 0) &&
         lastCount != currentCount) {
    fire_callback(NR_ASYNC_WAIT_READ);
    lastCount = currentCount;
  }

  // We're always ready to write after we're connected. The parent process will
  // buffer writes for us.
  if (!mClosed && mWebrtcTCPSocket && (poll_flags() & PR_POLL_WRITE) != 0) {
    fire_callback(NR_ASYNC_WAIT_WRITE);
  }
}

size_t NrTcpSocket::CountUnreadBytes() const {
  size_t count = 0;

  for (const NrTcpSocketData& data : mReadQueue) {
    count += data.GetData().Length();
  }

  MOZ_ASSERT(count >= mReadOffset, "offset exceeds read buffer length");

  count -= mReadOffset;

  return count;
}

void NrTcpSocket::AssignChannel_DoNotUse(WebrtcTCPSocketWrapper* aWrapper) {
  mWebrtcTCPSocket = aWrapper;
}

}  // namespace mozilla