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// Copyright 2019 Chris Koch. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package socketpair provides bidirectionally connected net.Conns.
//
// Intended for testing usages of net.PacketConns and net.Conns.
package socketpair
import (
"net"
"os"
"syscall"
"time"
)
// TCPPair6 returns two bidirectionally connected TCPConns using tcp6.
//
// They will be on randomly assigned ports.
func TCPPair6() (*net.TCPConn, *net.TCPConn, error) {
return tcpPair("tcp6")
}
// TCPPair returns two bidirectionally connected TCPConns.
//
// They will be on randomly assigned ports.
func TCPPair() (*net.TCPConn, *net.TCPConn, error) {
return tcpPair("tcp4")
}
func tcpPair(network string) (*net.TCPConn, *net.TCPConn, error) {
l, err := net.ListenTCP(network, nil)
if err != nil {
return nil, nil, err
}
serverAddr := l.Addr().(*net.TCPAddr)
type acceptRet struct {
c *net.TCPConn
err error
}
serverConnCh := make(chan acceptRet)
go func() {
c, err := l.AcceptTCP()
serverConnCh <- acceptRet{c: c, err: err}
}()
clientConn, err := net.DialTCP(network, nil, serverAddr)
if err != nil {
return nil, nil, err
}
accept := <-serverConnCh
if accept.err != nil {
return nil, nil, accept.err
}
return clientConn, accept.c, nil
}
// StreamSocketPair returns two bidirectionally connected net.Conns made from
// socketpair(2).
func StreamSocketPair() (net.Conn, net.Conn, error) {
fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
if err != nil {
return nil, nil, err
}
if err := syscall.SetNonblock(int(fds[0]), true); err != nil {
return nil, nil, err
}
if err := syscall.SetNonblock(int(fds[1]), true); err != nil {
return nil, nil, err
}
c0, err := net.FileConn(os.NewFile(uintptr(fds[0]), "socketpair-0"))
if err != nil {
return nil, nil, err
}
c1, err := net.FileConn(os.NewFile(uintptr(fds[1]), "socketpair-1"))
if err != nil {
return nil, nil, err
}
return c0, c1, nil
}
// PacketSocketPair returns two bidirectionally connected PacketConns made from
// socketpair(2).
func PacketSocketPair() (net.PacketConn, net.PacketConn, error) {
fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_DGRAM, 0)
if err != nil {
return nil, nil, err
}
if err := syscall.SetNonblock(int(fds[0]), true); err != nil {
return nil, nil, err
}
if err := syscall.SetNonblock(int(fds[1]), true); err != nil {
return nil, nil, err
}
f1 := os.NewFile(uintptr(fds[0]), "socket pair end 0")
sc1, err := f1.SyscallConn()
if err != nil {
return nil, nil, err
}
f2 := os.NewFile(uintptr(fds[1]), "socket pair end 1")
sc2, err := f2.SyscallConn()
if err != nil {
return nil, nil, err
}
n1 := &socketPair{
f: f1,
rc: sc1,
}
n2 := &socketPair{
f: f2,
rc: sc2,
}
return n1, n2, nil
}
type socketPair struct {
f *os.File
rc syscall.RawConn
}
func (s *socketPair) LocalAddr() net.Addr {
return nil
}
func (s *socketPair) SetDeadline(t time.Time) error {
return s.f.SetDeadline(t)
}
func (s *socketPair) SetReadDeadline(t time.Time) error {
return s.f.SetReadDeadline(t)
}
func (s *socketPair) SetWriteDeadline(t time.Time) error {
return s.f.SetWriteDeadline(t)
}
func (s *socketPair) Close() (err error) {
return s.f.Close()
}
func (s *socketPair) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
cerr := s.rc.Read(func(fd uintptr) bool {
n, err = syscall.Read(int(fd), p)
return err != syscall.EAGAIN
})
if err != nil {
return n, nil, err
}
return n, nil, cerr
}
func (s *socketPair) WriteTo(p []byte, _ net.Addr) (n int, err error) {
cerr := s.rc.Write(func(fd uintptr) bool {
n, err = syscall.Write(int(fd), p)
return err != syscall.EAGAIN
})
if err != nil {
return n, err
}
return 0, cerr
}
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