1 // Copyright 2018 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 || js || wasip1 || windows
6 7 package net
8 9 import (
10 "syscall"
11 )
12 13 // A sockaddr represents a TCP, UDP, IP or Unix network endpoint
14 // address that can be converted into a syscall.Sockaddr.
15 type sockaddr interface {
16 Addr
17 18 // family returns the platform-dependent address family
19 // identifier.
20 family() int
21 22 // isWildcard reports whether the address is a wildcard
23 // address.
24 isWildcard() bool
25 26 // sockaddr returns the address converted into a syscall
27 // sockaddr type that implements syscall.Sockaddr
28 // interface. It returns a nil interface when the address is
29 // nil.
30 sockaddr(family int) (syscall.Sockaddr, error)
31 32 // toLocal maps the zero address to a local system address (127.0.0.1 or ::1)
33 toLocal(net []byte) sockaddr
34 }
35 36 func (fd *netFD) addrFunc() func(syscall.Sockaddr) Addr {
37 switch fd.family {
38 case syscall.AF_INET, syscall.AF_INET6:
39 switch fd.sotype {
40 case syscall.SOCK_STREAM:
41 return sockaddrToTCP
42 case syscall.SOCK_DGRAM:
43 return sockaddrToUDP
44 case syscall.SOCK_RAW:
45 return sockaddrToIP
46 }
47 case syscall.AF_UNIX:
48 switch fd.sotype {
49 case syscall.SOCK_STREAM:
50 return sockaddrToUnix
51 case syscall.SOCK_DGRAM:
52 return sockaddrToUnixgram
53 case syscall.SOCK_SEQPACKET:
54 return sockaddrToUnixpacket
55 }
56 }
57 return func(syscall.Sockaddr) Addr { return nil }
58 }
59