sockaddr_posix.go

     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 string) 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
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