| // Copyright (c) 2011 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 "build/build_config.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 <errno.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include "net/base/net_errors.h" |
| #endif |
| |
| #include "base/eintr_wrapper.h" |
| #include "base/threading/platform_thread.h" |
| #include "net/base/net_util.h" |
| #include "net/base/listen_socket.h" |
| |
| #if defined(__LB_SHELL__) |
| #include "lb_platform.h" |
| #endif |
| |
| #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 SOCKET ListenSocket::kInvalidSocket = INVALID_SOCKET; |
| const int ListenSocket::kSocketError = SOCKET_ERROR; |
| #elif defined(OS_POSIX) |
| const SOCKET ListenSocket::kInvalidSocket = -1; |
| const int ListenSocket::kSocketError = -1; |
| #endif |
| |
| ListenSocket* ListenSocket::Listen(std::string ip, int port, |
| ListenSocketDelegate* del) { |
| SOCKET s = Listen(ip, port); |
| if (s == kInvalidSocket) { |
| // TODO(erikkay): error handling |
| } else { |
| ListenSocket* sock = new ListenSocket(s, del); |
| sock->Listen(); |
| return sock; |
| } |
| return NULL; |
| } |
| |
| void ListenSocket::Send(const char* bytes, int len, bool append_linefeed) { |
| SendInternal(bytes, len); |
| if (append_linefeed) { |
| SendInternal("\r\n", 2); |
| } |
| } |
| |
| void ListenSocket::Send(const std::string& str, bool append_linefeed) { |
| Send(str.data(), static_cast<int>(str.length()), append_linefeed); |
| } |
| |
| void ListenSocket::PauseReads() { |
| DCHECK(!reads_paused_); |
| reads_paused_ = true; |
| } |
| |
| void ListenSocket::ResumeReads() { |
| DCHECK(reads_paused_); |
| reads_paused_ = false; |
| if (has_pending_reads_) { |
| has_pending_reads_ = false; |
| Read(); |
| } |
| } |
| |
| ListenSocket::ListenSocket(SOCKET s, ListenSocketDelegate *del) |
| : socket_(s), |
| socket_delegate_(del), |
| 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 |
| } |
| |
| ListenSocket::~ListenSocket() { |
| #if defined(OS_WIN) |
| if (socket_event_) { |
| WSACloseEvent(socket_event_); |
| socket_event_ = WSA_INVALID_EVENT; |
| } |
| #endif |
| CloseSocket(socket_); |
| } |
| |
| SOCKET ListenSocket::Listen(std::string ip, int port) { |
| SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| if (s != kInvalidSocket) { |
| #if defined(OS_POSIX) |
| // Allow rapid reuse. |
| static const int kOn = 1; |
| setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &kOn, sizeof(kOn)); |
| #endif |
| sockaddr_in addr; |
| memset(&addr, 0, sizeof(addr)); |
| addr.sin_family = AF_INET; |
| addr.sin_addr.s_addr = inet_addr(ip.c_str()); |
| addr.sin_port = htons(port); |
| if (bind(s, reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) { |
| #if defined(OS_WIN) |
| closesocket(s); |
| #elif defined(OS_POSIX) |
| close(s); |
| #endif |
| s = kInvalidSocket; |
| } |
| } |
| return s; |
| } |
| |
| SOCKET ListenSocket::Accept(SOCKET s) { |
| sockaddr_in from; |
| socklen_t from_len = sizeof(from); |
| SOCKET conn = |
| HANDLE_EINTR(accept(s, reinterpret_cast<sockaddr*>(&from), &from_len)); |
| if (conn != kInvalidSocket) { |
| SetNonBlocking(conn); |
| } |
| return conn; |
| } |
| |
| void ListenSocket::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 ListenSocket::Listen() { |
| int backlog = 10; // TODO(erikkay): maybe don't allow any backlog? |
| listen(socket_, backlog); |
| // TODO(erikkay): error handling |
| #if defined(OS_POSIX) |
| WatchSocket(WAITING_ACCEPT); |
| #endif |
| } |
| |
| void ListenSocket::Accept() { |
| SOCKET conn = Accept(socket_); |
| if (conn != kInvalidSocket) { |
| scoped_refptr<ListenSocket> sock( |
| new ListenSocket(conn, socket_delegate_)); |
| // it's up to the delegate to AddRef if it wants to keep it around |
| #if defined(OS_POSIX) |
| sock->WatchSocket(WAITING_READ); |
| #endif |
| socket_delegate_->DidAccept(this, sock); |
| } else { |
| // TODO(ibrar): some error handling required here |
| } |
| } |
| |
| void ListenSocket::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 ListenSocket::Close() { |
| #if defined(OS_POSIX) |
| if (wait_state_ == NOT_WAITING) |
| return; |
| wait_state_ = NOT_WAITING; |
| #endif |
| UnwatchSocket(); |
| socket_delegate_->DidClose(this); |
| } |
| |
| void ListenSocket::CloseSocket(SOCKET s) { |
| if (s && s != kInvalidSocket) { |
| UnwatchSocket(); |
| #if defined(OS_WIN) |
| closesocket(s); |
| #elif defined(OS_POSIX) |
| #if defined(__LB_SHELL__) |
| LB::Platform::close_socket(s); |
| #else |
| close(s); |
| #endif |
| #endif |
| } |
| } |
| |
| void ListenSocket::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(). |
| #if defined(__LB_SHELL__) |
| MessageLoopForIO::current()->WatchSocket( |
| socket_, true, MessageLoopForIO::WATCH_READ, &watcher_, this); |
| #else |
| MessageLoopForIO::current()->WatchFileDescriptor( |
| socket_, true, MessageLoopForIO::WATCH_READ, &watcher_, this); |
| #endif |
| wait_state_ = state; |
| #endif |
| } |
| |
| void ListenSocket::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 ListenSocket::OnObjectSignaled(HANDLE object) { |
| WSANETWORKEVENTS ev; |
| if (kSocketError == WSAEnumNetworkEvents(socket_, socket_event_, &ev)) { |
| // TODO |
| 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(); |
| } |
| } |
| if (ev.lNetworkEvents & FD_CLOSE) { |
| Close(); |
| } |
| } |
| #elif defined(OS_POSIX) |
| void ListenSocket::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 ListenSocket::OnFileCanWriteWithoutBlocking(int fd) { |
| // MessagePumpLibevent callback, we don't listen for write events |
| // so we shouldn't ever reach here. |
| NOTREACHED(); |
| } |
| |
| #endif |
| |
| } // namespace net |