140 lines
3.3 KiB
Go
140 lines
3.3 KiB
Go
// socket_bsd.go -- Socket handling specific to *BSD based systems.
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Low-level socket interface.
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// Only for implementing net package.
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// DO NOT USE DIRECTLY.
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package syscall
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import "unsafe"
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type RawSockaddrInet4 struct {
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Len uint8;
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Family uint8;
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Port uint16;
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Addr [4]byte /* in_addr */;
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Zero [8]uint8;
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}
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type RawSockaddrInet6 struct {
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Len uint8;
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Family uint8;
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Port uint16;
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Flowinfo uint32;
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Addr [16]byte /* in6_addr */;
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Scope_id uint32;
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}
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type RawSockaddrUnix struct {
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Len uint8;
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Family uint8;
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Path [108]int8;
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}
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type RawSockaddr struct {
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Len uint8;
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Family uint8;
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Data [14]int8;
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}
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func (sa *SockaddrInet4) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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if sa.Port < 0 || sa.Port > 0xFFFF {
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return nil, 0, EINVAL;
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}
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sa.raw.Len = SizeofSockaddrInet4;
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sa.raw.Family = AF_INET;
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p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port));
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p[0] = byte(sa.Port>>8);
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p[1] = byte(sa.Port);
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for i := 0; i < len(sa.Addr); i++ {
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sa.raw.Addr[i] = sa.Addr[i];
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}
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return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), Socklen_t(sa.raw.Len), 0;
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}
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func (sa *SockaddrInet6) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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if sa.Port < 0 || sa.Port > 0xFFFF {
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return nil, 0, EINVAL;
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}
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sa.raw.Len = SizeofSockaddrInet6;
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sa.raw.Family = AF_INET6;
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p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port));
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p[0] = byte(sa.Port>>8);
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p[1] = byte(sa.Port);
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for i := 0; i < len(sa.Addr); i++ {
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sa.raw.Addr[i] = sa.Addr[i];
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}
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return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), Socklen_t(sa.raw.Len), 0;
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}
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func (sa *SockaddrUnix) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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name := sa.Name;
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n := len(name);
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if n >= len(sa.raw.Path) || n == 0 {
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return nil, 0, EINVAL;
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}
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sa.raw.Len = byte(3 + n); // 2 for Family, Len; 1 for NUL.
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sa.raw.Family = AF_UNIX;
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for i := 0; i < n; i++ {
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sa.raw.Path[i] = int8(name[i]);
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}
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if sa.raw.Path[0] == '@' {
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sa.raw.Path[0] = 0;
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}
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// length is family, name, NUL.
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return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), Socklen_t(sa.raw.Len), 0;
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}
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func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
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switch rsa.Addr.Family {
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case AF_UNIX:
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pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
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if pp.Len < 3 || pp.Len > SizeofSockaddrUnix {
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return nil, EINVAL
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}
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sa := new(SockaddrUnix)
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n := int(pp.Len) - 3 // subtract leading Family, Len, terminating NUL.
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for i := 0; i < n; i++ {
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if pp.Path[i] == 0 {
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// found early NUL; assume Len is overestimating.
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n = i
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break
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}
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}
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bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))
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sa.Name = string(bytes[0:n])
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return sa, 0
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case AF_INET:
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pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa));
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sa := new(SockaddrInet4);
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p := (*[2]byte)(unsafe.Pointer(&pp.Port));
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sa.Port = int(p[0])<<8 + int(p[1]);
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for i := 0; i < len(sa.Addr); i++ {
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sa.Addr[i] = pp.Addr[i];
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}
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return sa, 0;
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case AF_INET6:
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pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa));
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sa := new(SockaddrInet6);
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p := (*[2]byte)(unsafe.Pointer(&pp.Port));
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sa.Port = int(p[0])<<8 + int(p[1]);
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for i := 0; i < len(sa.Addr); i++ {
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sa.Addr[i] = pp.Addr[i];
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}
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return sa, 0;
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}
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return nil, EAFNOSUPPORT;
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}
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// BindToDevice binds the socket associated with fd to device.
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func BindToDevice(fd int, device string) (errno int) {
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return ENOSYS
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}
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