file_posix.go

     1  // Copyright 2025 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build unix || windows
     6  
     7  package net
     8  
     9  import (
    10  	"internal/poll"
    11  	"os"
    12  	"syscall"
    13  )
    14  
    15  func newFileFD(f *os.File) (*netFD, error) {
    16  	s, err := dupFileSocket(f)
    17  	if err != nil {
    18  		return nil, err
    19  	}
    20  	family := syscall.AF_UNSPEC
    21  	sotype, err := syscall.GetsockoptInt(s, syscall.SOL_SOCKET, _SO_TYPE)
    22  	if err != nil {
    23  		poll.CloseFunc(s)
    24  		return nil, os.NewSyscallError("getsockopt", err)
    25  	}
    26  	lsa, _ := syscall.Getsockname(s)
    27  	rsa, _ := syscall.Getpeername(s)
    28  	switch lsa.(type) {
    29  	case *syscall.SockaddrInet4:
    30  		family = syscall.AF_INET
    31  	case *syscall.SockaddrInet6:
    32  		family = syscall.AF_INET6
    33  	case *syscall.SockaddrUnix:
    34  		family = syscall.AF_UNIX
    35  	default:
    36  		poll.CloseFunc(s)
    37  		return nil, syscall.EPROTONOSUPPORT
    38  	}
    39  	fd, err := newFD(s, family, sotype, "")
    40  	if err != nil {
    41  		poll.CloseFunc(s)
    42  		return nil, err
    43  	}
    44  	laddr := fd.addrFunc()(lsa)
    45  	raddr := fd.addrFunc()(rsa)
    46  	fd.net = laddr.Network()
    47  	if err := fd.init(); err != nil {
    48  		fd.Close()
    49  		return nil, err
    50  	}
    51  	fd.setAddr(laddr, raddr)
    52  	return fd, nil
    53  }
    54  
    55  func fileConn(f *os.File) (Conn, error) {
    56  	fd, err := newFileFD(f)
    57  	if err != nil {
    58  		return nil, err
    59  	}
    60  	switch fd.laddr.(type) {
    61  	case *TCPAddr:
    62  		return newTCPConn(fd, defaultTCPKeepAliveIdle, KeepAliveConfig{}, testPreHookSetKeepAlive, testHookSetKeepAlive), nil
    63  	case *UDPAddr:
    64  		return newUDPConn(fd), nil
    65  	case *IPAddr:
    66  		return newIPConn(fd), nil
    67  	case *UnixAddr:
    68  		return newUnixConn(fd), nil
    69  	}
    70  	fd.Close()
    71  	return nil, syscall.EINVAL
    72  }
    73  
    74  func fileListener(f *os.File) (Listener, error) {
    75  	fd, err := newFileFD(f)
    76  	if err != nil {
    77  		return nil, err
    78  	}
    79  	switch laddr := fd.laddr.(type) {
    80  	case *TCPAddr:
    81  		return &TCPListener{fd: fd}, nil
    82  	case *UnixAddr:
    83  		return &UnixListener{fd: fd, path: laddr.Name, unlink: false}, nil
    84  	}
    85  	fd.Close()
    86  	return nil, syscall.EINVAL
    87  }
    88  
    89  func filePacketConn(f *os.File) (PacketConn, error) {
    90  	fd, err := newFileFD(f)
    91  	if err != nil {
    92  		return nil, err
    93  	}
    94  	switch fd.laddr.(type) {
    95  	case *UDPAddr:
    96  		return newUDPConn(fd), nil
    97  	case *IPAddr:
    98  		return newIPConn(fd), nil
    99  	case *UnixAddr:
   100  		return newUnixConn(fd), nil
   101  	}
   102  	fd.Close()
   103  	return nil, syscall.EINVAL
   104  }
   105
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