| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/socket/stream_listen_socket.h" |
| |
| #if defined(OS_WIN) |
| // winsock2.h must be included first in order to ensure it is included before |
| // windows.h. |
| #include <winsock2.h> |
| #elif defined(OS_POSIX) |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <netinet/in.h> |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| #include "net/base/net_errors.h" |
| #endif |
| |
| #include "base/logging.h" |
| #include "base/memory/ref_counted.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/posix/eintr_wrapper.h" |
| #include "base/profiler/scoped_tracker.h" |
| #include "base/sys_byteorder.h" |
| #include "base/threading/platform_thread.h" |
| #include "build/build_config.h" |
| #include "net/base/ip_endpoint.h" |
| #include "net/base/net_errors.h" |
| #include "net/base/net_util.h" |
| #include "net/socket/socket_descriptor.h" |
| |
| using std::string; |
| |
| #if defined(OS_WIN) |
| typedef int socklen_t; |
| #endif // defined(OS_WIN) |
| |
| namespace net { |
| |
| namespace { |
| |
| const int kReadBufSize = 4096; |
| |
| } // namespace |
| |
| #if defined(OS_WIN) |
| const int StreamListenSocket::kSocketError = SOCKET_ERROR; |
| #elif defined(OS_POSIX) |
| const int StreamListenSocket::kSocketError = -1; |
| #endif |
| |
| StreamListenSocket::StreamListenSocket(SocketDescriptor s, |
| StreamListenSocket::Delegate* del) |
| : socket_delegate_(del), |
| socket_(s), |
| reads_paused_(false), |
| has_pending_reads_(false) { |
| #if defined(OS_WIN) |
| socket_event_ = WSACreateEvent(); |
| // TODO(ibrar): error handling in case of socket_event_ == WSA_INVALID_EVENT. |
| WatchSocket(NOT_WAITING); |
| #elif defined(OS_POSIX) |
| wait_state_ = NOT_WAITING; |
| #endif |
| } |
| |
| StreamListenSocket::~StreamListenSocket() { |
| CloseSocket(); |
| #if defined(OS_WIN) |
| if (socket_event_) { |
| WSACloseEvent(socket_event_); |
| socket_event_ = WSA_INVALID_EVENT; |
| } |
| #endif |
| } |
| |
| void StreamListenSocket::Send(const char* bytes, int len, |
| bool append_linefeed) { |
| SendInternal(bytes, len); |
| if (append_linefeed) |
| SendInternal("\r\n", 2); |
| } |
| |
| void StreamListenSocket::Send(const string& str, bool append_linefeed) { |
| Send(str.data(), static_cast<int>(str.length()), append_linefeed); |
| } |
| |
| int StreamListenSocket::GetLocalAddress(IPEndPoint* address) { |
| SockaddrStorage storage; |
| if (getsockname(socket_, storage.addr, &storage.addr_len)) { |
| #if defined(OS_WIN) |
| int err = WSAGetLastError(); |
| #else |
| int err = errno; |
| #endif |
| return MapSystemError(err); |
| } |
| if (!address->FromSockAddr(storage.addr, storage.addr_len)) |
| return ERR_ADDRESS_INVALID; |
| return OK; |
| } |
| |
| int StreamListenSocket::GetPeerAddress(IPEndPoint* address) { |
| SockaddrStorage storage; |
| if (getpeername(socket_, storage.addr, &storage.addr_len)) { |
| #if defined(OS_WIN) |
| int err = WSAGetLastError(); |
| #else |
| int err = errno; |
| #endif |
| return MapSystemError(err); |
| } |
| |
| if (!address->FromSockAddr(storage.addr, storage.addr_len)) |
| return ERR_ADDRESS_INVALID; |
| |
| return OK; |
| } |
| |
| SocketDescriptor StreamListenSocket::AcceptSocket() { |
| SocketDescriptor conn = HANDLE_EINTR(accept(socket_, NULL, NULL)); |
| if (conn == kInvalidSocket) |
| LOG(ERROR) << "Error accepting connection."; |
| else |
| SetNonBlocking(conn); |
| return conn; |
| } |
| |
| void StreamListenSocket::SendInternal(const char* bytes, int len) { |
| char* send_buf = const_cast<char *>(bytes); |
| int len_left = len; |
| while (true) { |
| int sent = HANDLE_EINTR(send(socket_, send_buf, len_left, 0)); |
| if (sent == len_left) { // A shortcut to avoid extraneous checks. |
| break; |
| } |
| if (sent == kSocketError) { |
| #if defined(OS_WIN) |
| if (WSAGetLastError() != WSAEWOULDBLOCK) { |
| LOG(ERROR) << "send failed: WSAGetLastError()==" << WSAGetLastError(); |
| #elif defined(OS_POSIX) |
| if (errno != EWOULDBLOCK && errno != EAGAIN) { |
| LOG(ERROR) << "send failed: errno==" << errno; |
| #endif |
| break; |
| } |
| // Otherwise we would block, and now we have to wait for a retry. |
| // Fall through to PlatformThread::YieldCurrentThread() |
| } else { |
| // sent != len_left according to the shortcut above. |
| // Shift the buffer start and send the remainder after a short while. |
| send_buf += sent; |
| len_left -= sent; |
| } |
| base::PlatformThread::YieldCurrentThread(); |
| } |
| } |
| |
| void StreamListenSocket::Listen() { |
| int backlog = 10; // TODO(erikkay): maybe don't allow any backlog? |
| if (listen(socket_, backlog) == -1) { |
| // TODO(erikkay): error handling. |
| LOG(ERROR) << "Could not listen on socket."; |
| return; |
| } |
| #if defined(OS_POSIX) |
| WatchSocket(WAITING_ACCEPT); |
| #endif |
| } |
| |
| void StreamListenSocket::Read() { |
| char buf[kReadBufSize + 1]; // +1 for null termination. |
| int len; |
| do { |
| len = HANDLE_EINTR(recv(socket_, buf, kReadBufSize, 0)); |
| if (len == kSocketError) { |
| #if defined(OS_WIN) |
| int err = WSAGetLastError(); |
| if (err == WSAEWOULDBLOCK) { |
| #elif defined(OS_POSIX) |
| if (errno == EWOULDBLOCK || errno == EAGAIN) { |
| #endif |
| break; |
| } else { |
| // TODO(ibrar): some error handling required here. |
| break; |
| } |
| } else if (len == 0) { |
| // In Windows, Close() is called by OnObjectSignaled. In POSIX, we need |
| // to call it here. |
| #if defined(OS_POSIX) |
| Close(); |
| #endif |
| } else { |
| // TODO(ibrar): maybe change DidRead to take a length instead. |
| DCHECK_GT(len, 0); |
| DCHECK_LE(len, kReadBufSize); |
| buf[len] = 0; // Already create a buffer with +1 length. |
| socket_delegate_->DidRead(this, buf, len); |
| } |
| } while (len == kReadBufSize); |
| } |
| |
| void StreamListenSocket::Close() { |
| #if defined(OS_POSIX) |
| if (wait_state_ == NOT_WAITING) |
| return; |
| wait_state_ = NOT_WAITING; |
| #endif |
| UnwatchSocket(); |
| socket_delegate_->DidClose(this); |
| } |
| |
| void StreamListenSocket::CloseSocket() { |
| if (socket_ != kInvalidSocket) { |
| UnwatchSocket(); |
| #if defined(OS_WIN) |
| closesocket(socket_); |
| #elif defined(OS_POSIX) |
| close(socket_); |
| #endif |
| } |
| } |
| |
| void StreamListenSocket::WatchSocket(WaitState state) { |
| #if defined(OS_WIN) |
| WSAEventSelect(socket_, socket_event_, FD_ACCEPT | FD_CLOSE | FD_READ); |
| watcher_.StartWatching(socket_event_, this); |
| #elif defined(OS_POSIX) |
| // Implicitly calls StartWatchingFileDescriptor(). |
| base::MessageLoopForIO::current()->WatchFileDescriptor( |
| socket_, true, base::MessageLoopForIO::WATCH_READ, &watcher_, this); |
| wait_state_ = state; |
| #endif |
| } |
| |
| void StreamListenSocket::UnwatchSocket() { |
| #if defined(OS_WIN) |
| watcher_.StopWatching(); |
| #elif defined(OS_POSIX) |
| watcher_.StopWatchingFileDescriptor(); |
| #endif |
| } |
| |
| // TODO(ibrar): We can add these functions into OS dependent files. |
| #if defined(OS_WIN) |
| // MessageLoop watcher callback. |
| void StreamListenSocket::OnObjectSignaled(HANDLE object) { |
| // TODO(vadimt): Remove ScopedTracker below once crbug.com/418183 is fixed. |
| tracked_objects::ScopedTracker tracking_profile( |
| FROM_HERE_WITH_EXPLICIT_FUNCTION( |
| "418183 StreamListenSocket::OnObjectSignaled")); |
| |
| WSANETWORKEVENTS ev; |
| if (kSocketError == WSAEnumNetworkEvents(socket_, socket_event_, &ev)) { |
| // TODO |
| return; |
| } |
| |
| // If both FD_CLOSE and FD_READ are set we only call Read(). |
| // This will cause OnObjectSignaled to be called immediately again |
| // unless this socket is destroyed in Read(). |
| if ((ev.lNetworkEvents & (FD_CLOSE | FD_READ)) == FD_CLOSE) { |
| Close(); |
| // Close might have deleted this object. We should return immediately. |
| return; |
| } |
| // The object was reset by WSAEnumNetworkEvents. Watch for the next signal. |
| watcher_.StartWatching(object, this); |
| |
| if (ev.lNetworkEvents == 0) { |
| // Occasionally the event is set even though there is no new data. |
| // The net seems to think that this is ignorable. |
| return; |
| } |
| if (ev.lNetworkEvents & FD_ACCEPT) { |
| Accept(); |
| } |
| if (ev.lNetworkEvents & FD_READ) { |
| if (reads_paused_) { |
| has_pending_reads_ = true; |
| } else { |
| Read(); |
| // Read might have deleted this object. We should return immediately. |
| } |
| } |
| } |
| #elif defined(OS_POSIX) |
| void StreamListenSocket::OnFileCanReadWithoutBlocking(int fd) { |
| switch (wait_state_) { |
| case WAITING_ACCEPT: |
| Accept(); |
| break; |
| case WAITING_READ: |
| if (reads_paused_) { |
| has_pending_reads_ = true; |
| } else { |
| Read(); |
| } |
| break; |
| default: |
| // Close() is called by Read() in the Linux case. |
| NOTREACHED(); |
| break; |
| } |
| } |
| |
| void StreamListenSocket::OnFileCanWriteWithoutBlocking(int fd) { |
| // MessagePumpLibevent callback, we don't listen for write events |
| // so we shouldn't ever reach here. |
| NOTREACHED(); |
| } |
| |
| #endif |
| |
| void StreamListenSocket::PauseReads() { |
| DCHECK(!reads_paused_); |
| reads_paused_ = true; |
| } |
| |
| void StreamListenSocket::ResumeReads() { |
| DCHECK(reads_paused_); |
| reads_paused_ = false; |
| if (has_pending_reads_) { |
| has_pending_reads_ = false; |
| Read(); |
| } |
| } |
| |
| } // namespace net |