net/SocketDescriptor: specialization of FileDescriptor for network sockets
This commit is contained in:
Max Kellermann
405
src/net/SocketDescriptor.cxx
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405
src/net/SocketDescriptor.cxx
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/*
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* Copyright (C) 2012-2017 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "SocketDescriptor.hxx"
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#include "SocketAddress.hxx"
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#include "StaticSocketAddress.hxx"
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#ifdef _WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#else
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#include <sys/socket.h>
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#endif
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#include <errno.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <string.h>
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#ifdef _WIN32
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void
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SocketDescriptor::Close()
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{
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if (IsDefined())
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::closesocket(Steal());
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}
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#endif
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SocketDescriptor
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SocketDescriptor::Accept()
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{
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#if defined(__linux__) && !defined(__BIONIC__) && !defined(KOBO)
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int connection_fd = ::accept4(Get(), nullptr, nullptr, SOCK_CLOEXEC);
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#else
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int connection_fd = ::accept(Get(), nullptr, nullptr);
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#endif
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return connection_fd >= 0
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? SocketDescriptor(connection_fd)
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: Undefined();
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}
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SocketDescriptor
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SocketDescriptor::AcceptNonBlock(StaticSocketAddress &address) const
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{
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address.SetMaxSize();
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#if defined(__linux__) && !defined(__BIONIC__) && !defined(KOBO)
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int connection_fd = ::accept4(Get(), address, &address.size,
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SOCK_CLOEXEC|SOCK_NONBLOCK);
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#else
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int connection_fd = ::accept(Get(), address, &address.size);
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#endif
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return SocketDescriptor(connection_fd);
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}
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bool
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SocketDescriptor::Connect(SocketAddress address)
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{
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assert(address.IsDefined());
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return ::connect(Get(), address.GetAddress(), address.GetSize()) >= 0;
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}
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bool
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SocketDescriptor::Create(int domain, int type, int protocol)
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{
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#ifdef WIN32
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static bool initialised = false;
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if (!initialised) {
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WSADATA data;
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WSAStartup(MAKEWORD(2,2), &data);
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initialised = true;
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}
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#endif
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#ifdef SOCK_CLOEXEC
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/* implemented since Linux 2.6.27 */
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type |= SOCK_CLOEXEC;
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#endif
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int new_fd = socket(domain, type, protocol);
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if (new_fd < 0)
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return false;
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Set(new_fd);
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return true;
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}
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bool
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SocketDescriptor::CreateNonBlock(int domain, int type, int protocol)
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{
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#ifdef SOCK_NONBLOCK
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type |= SOCK_NONBLOCK;
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#endif
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if (!Create(domain, type, protocol))
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return false;
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#ifndef __linux__
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SetNonBlocking();
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#endif
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return true;
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}
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bool
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SocketDescriptor::CreateSocketPair(int domain, int type, int protocol,
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SocketDescriptor &a, SocketDescriptor &b)
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{
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#ifdef SOCK_CLOEXEC
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/* implemented since Linux 2.6.27 */
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type |= SOCK_CLOEXEC;
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#endif
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int fds[2];
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if (socketpair(domain, type, protocol, fds) < 0)
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return false;
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a = SocketDescriptor(fds[0]);
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b = SocketDescriptor(fds[1]);
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return true;
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}
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bool
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SocketDescriptor::CreateSocketPairNonBlock(int domain, int type, int protocol,
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SocketDescriptor &a, SocketDescriptor &b)
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{
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#ifdef SOCK_CLOEXEC
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/* implemented since Linux 2.6.27 */
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type |= SOCK_CLOEXEC;
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#endif
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if (!CreateSocketPair(domain, type, protocol, a, b))
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return false;
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#ifndef __linux__
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a.SetNonBlocking();
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b.SetNonBlocking();
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#endif
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return true;
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}
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int
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SocketDescriptor::GetError()
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{
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assert(IsDefined());
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int s_err = 0;
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socklen_t s_err_size = sizeof(s_err);
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return getsockopt(fd, SOL_SOCKET, SO_ERROR,
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(char *)&s_err, &s_err_size) == 0
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? s_err
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: errno;
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}
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bool
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SocketDescriptor::SetOption(int level, int name,
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const void *value, size_t size)
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{
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assert(IsDefined());
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return setsockopt(fd, level, name, value, size) == 0;
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}
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#ifdef __linux__
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bool
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SocketDescriptor::SetReuseAddress(bool value)
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{
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return SetBoolOption(SOL_SOCKET, SO_REUSEADDR, value);
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}
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#ifdef SO_REUSEPORT
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bool
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SocketDescriptor::SetReusePort(bool value)
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{
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return SetBoolOption(SOL_SOCKET, SO_REUSEPORT, value);
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}
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#endif
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bool
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SocketDescriptor::SetFreeBind(bool value)
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{
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return SetBoolOption(IPPROTO_IP, IP_FREEBIND, value);
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}
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bool
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SocketDescriptor::SetNoDelay(bool value)
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{
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return SetBoolOption(IPPROTO_TCP, TCP_NODELAY, value);
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}
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bool
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SocketDescriptor::SetCork(bool value)
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{
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return SetBoolOption(IPPROTO_TCP, TCP_CORK, value);
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}
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bool
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SocketDescriptor::SetTcpDeferAccept(const int &seconds)
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{
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return SetOption(IPPROTO_TCP, TCP_DEFER_ACCEPT, &seconds, sizeof(seconds));
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}
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bool
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SocketDescriptor::SetV6Only(bool value)
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{
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return SetBoolOption(IPPROTO_IPV6, IPV6_V6ONLY, value);
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}
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bool
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SocketDescriptor::SetBindToDevice(const char *name)
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{
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return SetOption(SOL_SOCKET, SO_BINDTODEVICE, name, strlen(name));
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}
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#ifdef TCP_FASTOPEN
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bool
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SocketDescriptor::SetTcpFastOpen(int qlen)
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{
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return SetOption(SOL_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen));
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}
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#endif
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#endif
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bool
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SocketDescriptor::Bind(SocketAddress address)
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{
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return bind(Get(), address.GetAddress(), address.GetSize()) == 0;
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}
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#ifdef __linux__
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bool
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SocketDescriptor::AutoBind()
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{
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static constexpr sa_family_t family = AF_LOCAL;
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return Bind(SocketAddress((const struct sockaddr *)&family,
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sizeof(family)));
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}
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#endif
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bool
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SocketDescriptor::Listen(int backlog)
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{
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return listen(Get(), backlog) == 0;
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}
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StaticSocketAddress
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SocketDescriptor::GetLocalAddress() const
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{
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assert(IsDefined());
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StaticSocketAddress result;
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result.size = result.GetCapacity();
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if (getsockname(fd, result, &result.size) < 0)
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result.Clear();
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return result;
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}
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StaticSocketAddress
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SocketDescriptor::GetPeerAddress() const
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{
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assert(IsDefined());
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StaticSocketAddress result;
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result.size = result.GetCapacity();
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if (getpeername(fd, result, &result.size) < 0)
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result.Clear();
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return result;
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}
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ssize_t
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SocketDescriptor::Read(void *buffer, size_t length)
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{
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int flags = 0;
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#ifndef _WIN32
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flags |= MSG_DONTWAIT;
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#endif
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return ::recv(Get(), (char *)buffer, length, flags);
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}
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ssize_t
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SocketDescriptor::Write(const void *buffer, size_t length)
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{
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int flags = 0;
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#ifdef __linux__
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flags |= MSG_NOSIGNAL;
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#endif
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return ::send(Get(), (const char *)buffer, length, flags);
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}
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#ifdef _WIN32
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int
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SocketDescriptor::WaitReadable(int timeout_ms) const
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{
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assert(IsDefined());
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fd_set rfds;
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FD_ZERO(&rfds);
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FD_SET(Get(), &rfds);
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struct timeval timeout, *timeout_p = nullptr;
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if (timeout_ms >= 0) {
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timeout.tv_sec = unsigned(timeout_ms) / 1000;
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timeout.tv_usec = (unsigned(timeout_ms) % 1000) * 1000;
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timeout_p = &timeout;
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}
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return select(Get() + 1, &rfds, nullptr, nullptr, timeout_p);
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}
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int
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SocketDescriptor::WaitWritable(int timeout_ms) const
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{
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assert(IsDefined());
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fd_set wfds;
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FD_ZERO(&wfds);
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FD_SET(Get(), &wfds);
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struct timeval timeout, *timeout_p = nullptr;
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if (timeout_ms >= 0) {
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timeout.tv_sec = unsigned(timeout_ms) / 1000;
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timeout.tv_usec = (unsigned(timeout_ms) % 1000) * 1000;
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timeout_p = &timeout;
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}
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return select(Get() + 1, nullptr, &wfds, nullptr, timeout_p);
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}
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#endif
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ssize_t
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SocketDescriptor::Read(void *buffer, size_t length,
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StaticSocketAddress &address)
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{
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int flags = 0;
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#ifndef _WIN32
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flags |= MSG_DONTWAIT;
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#endif
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socklen_t addrlen = address.GetCapacity();
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ssize_t nbytes = ::recvfrom(Get(), (char *)buffer, length, flags,
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address, &addrlen);
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if (nbytes > 0)
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address.SetSize(addrlen);
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return nbytes;
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}
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ssize_t
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SocketDescriptor::Write(const void *buffer, size_t length,
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SocketAddress address)
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{
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int flags = 0;
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#ifndef _WIN32
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flags |= MSG_DONTWAIT;
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#endif
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#ifdef __linux__
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flags |= MSG_NOSIGNAL;
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#endif
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return ::sendto(Get(), (const char *)buffer, length, flags,
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address.GetAddress(), address.GetSize());
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}
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