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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package net
import (
"internal/syscall/unix"
"os"
"syscall"
)
func dupSocket(f *os.File) (int, error) {
s, err := dupCloseOnExec(int(f.Fd()))
if err != nil {
return -1, err
}
if err := syscall.SetNonblock(s, true); err != nil {
closeFunc(s)
return -1, os.NewSyscallError("setnonblock", err)
}
return s, nil
}
func newFileFD(f *os.File, sa SocketAddr) (*netFD, error) {
s, err := dupSocket(f)
if err != nil {
return nil, err
}
var laddr, raddr Addr
var fd *netFD
if sa != nil {
lsa := make([]byte, syscall.SizeofSockaddrAny)
if err := unix.Getsockname(s, lsa); err != nil {
lsa = nil
}
rsa := make([]byte, syscall.SizeofSockaddrAny)
if err := unix.Getpeername(s, rsa); err != nil {
rsa = nil
}
laddr = sa.Addr(lsa)
raddr = sa.Addr(rsa)
fd, err = newFD(s, -1, -1, laddr.Network())
} else {
family := syscall.AF_UNSPEC
sotype, err := syscall.GetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_TYPE)
if err != nil {
closeFunc(s)
return nil, os.NewSyscallError("getsockopt", err)
}
lsa, _ := syscall.Getsockname(s)
rsa, _ := syscall.Getpeername(s)
switch lsa.(type) {
case *syscall.SockaddrInet4:
family = syscall.AF_INET
case *syscall.SockaddrInet6:
family = syscall.AF_INET6
case *syscall.SockaddrUnix:
family = syscall.AF_UNIX
default:
closeFunc(s)
return nil, syscall.EPROTONOSUPPORT
}
fd, err = newFD(s, family, sotype, "")
laddr = fd.addrFunc()(lsa)
raddr = fd.addrFunc()(rsa)
fd.net = laddr.Network()
}
if err != nil {
closeFunc(s)
return nil, err
}
if err := fd.init(); err != nil {
fd.Close()
return nil, err
}
fd.setAddr(laddr, raddr)
return fd, nil
}
func fileConn(f *os.File) (Conn, error) {
fd, err := newFileFD(f, nil)
if err != nil {
return nil, err
}
switch fd.laddr.(type) {
case *TCPAddr:
return newTCPConn(fd), nil
case *UDPAddr:
return newUDPConn(fd), nil
case *IPAddr:
return newIPConn(fd), nil
case *UnixAddr:
return newUnixConn(fd), nil
}
fd.Close()
return nil, syscall.EINVAL
}
func fileListener(f *os.File) (Listener, error) {
fd, err := newFileFD(f, nil)
if err != nil {
return nil, err
}
switch laddr := fd.laddr.(type) {
case *TCPAddr:
return &TCPListener{fd}, nil
case *UnixAddr:
return &UnixListener{fd, laddr.Name}, nil
}
fd.Close()
return nil, syscall.EINVAL
}
func filePacketConn(f *os.File) (PacketConn, error) {
fd, err := newFileFD(f, nil)
if err != nil {
return nil, err
}
switch fd.laddr.(type) {
case *UDPAddr:
return newUDPConn(fd), nil
case *IPAddr:
return newIPConn(fd), nil
case *UnixAddr:
return newUnixConn(fd), nil
}
fd.Close()
return nil, syscall.EINVAL
}
func socketConn(f *os.File, sa SocketAddr) (Conn, error) {
fd, err := newFileFD(f, sa)
if err != nil {
return nil, err
}
return &socketFile{conn: conn{fd}, SocketAddr: sa}, nil
}
func socketPacketConn(f *os.File, sa SocketAddr) (PacketConn, error) {
fd, err := newFileFD(f, sa)
if err != nil {
return nil, err
}
return &socketFile{conn: conn{fd}, SocketAddr: sa}, nil
}
var (
_ Conn = &socketFile{}
_ PacketConn = &socketFile{}
)
// A socketFile is a placeholder that holds a user-specified socket
// descriptor and a profile of socket address encoding.
// It implements both Conn and PacketConn interfaces.
type socketFile struct {
conn
SocketAddr
}
func (c *socketFile) ReadFrom(b []byte) (int, Addr, error) {
if !c.ok() {
return 0, nil, syscall.EINVAL
}
from := make([]byte, syscall.SizeofSockaddrAny)
n, err := c.fd.recvFrom(b, 0, from)
if err != nil {
return n, nil, &OpError{Op: "read", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return n, c.SocketAddr.Addr(from), nil
}
func (c *socketFile) WriteTo(b []byte, addr Addr) (int, error) {
if !c.ok() {
return 0, syscall.EINVAL
}
n, err := c.fd.sendTo(b, 0, c.SocketAddr.Raw(addr))
if err != nil {
return n, &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: c.fd.raddr, Err: err}
}
return n, nil
}
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