gcc/libgo/go/syscall/socket.go
Ian Lance Taylor 4a1a859611 syscall: Support socket control messages.
From-SVN: r183745
2012-01-30 23:57:42 +00:00

412 lines
11 KiB
Go

// socket.go -- Socket handling.
// Copyright 2009 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.
// Low-level socket interface.
// Only for implementing net package.
// DO NOT USE DIRECTLY.
package syscall
import "unsafe"
// For testing: clients can set this flag to force
// creation of IPv6 sockets to return EAFNOSUPPORT.
var SocketDisableIPv6 bool
type Sockaddr interface {
sockaddr() (ptr *RawSockaddrAny, len Socklen_t, err error) // lowercase; only we can define Sockaddrs
}
type RawSockaddrAny struct {
Addr RawSockaddr
Pad [12]int8
}
const SizeofSockaddrAny = 0x1c
type SockaddrInet4 struct {
Port int
Addr [4]byte
raw RawSockaddrInet4
}
func (sa *SockaddrInet4) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return nil, 0, EINVAL
}
sa.raw.Family = AF_INET
n := sa.raw.setLen()
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), n, nil
}
type SockaddrInet6 struct {
Port int
ZoneId uint32
Addr [16]byte
raw RawSockaddrInet6
}
func (sa *SockaddrInet6) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
if sa.Port < 0 || sa.Port > 0xFFFF {
return nil, 0, EINVAL
}
sa.raw.Family = AF_INET6
n := sa.raw.setLen()
p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
p[0] = byte(sa.Port >> 8)
p[1] = byte(sa.Port)
sa.raw.Scope_id = sa.ZoneId
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i]
}
return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), n, nil
}
type SockaddrUnix struct {
Name string
raw RawSockaddrUnix
}
func (sa *SockaddrUnix) sockaddr() (*RawSockaddrAny, Socklen_t, error) {
name := sa.Name
n := len(name)
if n >= len(sa.raw.Path) || n == 0 {
return nil, 0, EINVAL
}
sa.raw.Family = AF_UNIX
sa.raw.setLen(n)
for i := 0; i < n; i++ {
sa.raw.Path[i] = int8(name[i])
}
if sa.raw.Path[0] == '@' {
sa.raw.Path[0] = 0
}
// length is family (uint16), name, NUL.
return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), 2 + Socklen_t(n) + 1, nil
}
func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
switch rsa.Addr.Family {
case AF_UNIX:
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
sa := new(SockaddrUnix)
n, err := pp.getLen()
if err != nil {
return nil, err
}
bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))
sa.Name = string(bytes[0:n])
return sa, nil
case AF_INET:
pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
sa := new(SockaddrInet4)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
case AF_INET6:
pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
sa := new(SockaddrInet6)
p := (*[2]byte)(unsafe.Pointer(&pp.Port))
sa.Port = int(p[0])<<8 + int(p[1])
for i := 0; i < len(sa.Addr); i++ {
sa.Addr[i] = pp.Addr[i]
}
return sa, nil
}
return anyToSockaddrOS(rsa)
}
//sys accept(fd int, sa *RawSockaddrAny, len *Socklen_t) (nfd int, err error)
//accept(fd int, sa *RawSockaddrAny, len *Socklen_t) int
func Accept(fd int) (nfd int, sa Sockaddr, err error) {
var rsa RawSockaddrAny
var len Socklen_t = SizeofSockaddrAny
nfd, err = accept(fd, &rsa, &len)
if err != nil {
return
}
sa, err = anyToSockaddr(&rsa)
if err != nil {
Close(nfd)
nfd = 0
}
return
}
//sysnb getsockname(fd int, sa *RawSockaddrAny, len *Socklen_t) (err error)
//getsockname(fd int, sa *RawSockaddrAny, len *Socklen_t) int
func Getsockname(fd int) (sa Sockaddr, err error) {
var rsa RawSockaddrAny
var len Socklen_t = SizeofSockaddrAny
if err = getsockname(fd, &rsa, &len); err != nil {
return
}
return anyToSockaddr(&rsa)
}
//sysnb getpeername(fd int, sa *RawSockaddrAny, len *Socklen_t) (err error)
//getpeername(fd int, sa *RawSockaddrAny, len *Socklen_t) int
func Getpeername(fd int) (sa Sockaddr, err error) {
var rsa RawSockaddrAny
var len Socklen_t = SizeofSockaddrAny
if err = getpeername(fd, &rsa, &len); err != nil {
return
}
return anyToSockaddr(&rsa)
}
//sys bind(fd int, sa *RawSockaddrAny, len Socklen_t) (err error)
//bind(fd int, sa *RawSockaddrAny, len Socklen_t) int
func Bind(fd int, sa Sockaddr) (err error) {
ptr, n, err := sa.sockaddr()
if err != nil {
return err
}
return bind(fd, ptr, n)
}
//sys connect(s int, addr *RawSockaddrAny, addrlen Socklen_t) (err error)
//connect(s int, addr *RawSockaddrAny, addrlen Socklen_t) int
func Connect(fd int, sa Sockaddr) (err error) {
ptr, n, err := sa.sockaddr()
if err != nil {
return err
}
return connect(fd, ptr, n)
}
//sysnb socket(domain int, typ int, proto int) (fd int, err error)
//socket(domain int, typ int, protocol int) int
func Socket(domain, typ, proto int) (fd int, err error) {
if domain == AF_INET6 && SocketDisableIPv6 {
return -1, EAFNOSUPPORT
}
fd, err = socket(domain, typ, proto)
return
}
//sysnb socketpair(domain int, typ int, proto int, fd *[2]int) (err error)
//socketpair(domain int, typ int, protocol int, fd *[2]int) int
func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
err = socketpair(domain, typ, proto, &fd)
return
}
//sys getsockopt(s int, level int, name int, val uintptr, vallen *Socklen_t) (err error)
//getsockopt(s int, level int, name int, val *byte, vallen *Socklen_t) int
func GetsockoptInt(fd, level, opt int) (value int, err error) {
var n int32
vallen := Socklen_t(4)
err = getsockopt(fd, level, opt, (uintptr)(unsafe.Pointer(&n)), &vallen)
return int(n), err
}
func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
vallen := Socklen_t(4)
err = getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value[0])), &vallen)
return value, err
}
func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
var value IPMreq
vallen := Socklen_t(SizeofIPMreq)
err := getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value)), &vallen)
return &value, err
}
func GetsockoptIPMreqn(fd, level, opt int) (*IPMreqn, error) {
var value IPMreqn
vallen := Socklen_t(SizeofIPMreqn)
err := getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value)), &vallen)
return &value, err
}
func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
var value IPv6Mreq
vallen := Socklen_t(SizeofIPv6Mreq)
err := getsockopt(fd, level, opt, uintptr(unsafe.Pointer(&value)), &vallen)
return &value, err
}
//sys setsockopt(s int, level int, name int, val *byte, vallen Socklen_t) (err error)
//setsockopt(s int, level int, optname int, val *byte, vallen Socklen_t) int
func SetsockoptInt(fd, level, opt int, value int) (err error) {
var n = int32(value)
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(&n)), 4)
}
func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(&value[0])), 4)
}
func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(tv)), Socklen_t(unsafe.Sizeof(*tv)))
}
type Linger struct {
Onoff int32
Linger int32
}
func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(l)), Socklen_t(unsafe.Sizeof(*l)))
}
func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(mreq)), Socklen_t(unsafe.Sizeof(*mreq)))
}
func SetsockoptIPMreqn(fd, level, opt int, mreq *IPMreqn) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(mreq)), Socklen_t(unsafe.Sizeof(*mreq)))
}
func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(mreq)), Socklen_t(unsafe.Sizeof(*mreq)))
}
func SetsockoptString(fd, level, opt int, s string) (err error) {
return setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(&[]byte(s)[0])), Socklen_t(len(s)))
}
//sys recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *Socklen_t) (n int, err error)
//recvfrom(fd int, buf *byte, len Size_t, flags int, from *RawSockaddrAny, fromlen *Socklen_t) Ssize_t
func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
var rsa RawSockaddrAny
var len Socklen_t = SizeofSockaddrAny
if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
return
}
from, err = anyToSockaddr(&rsa)
return
}
//sys sendto(s int, buf []byte, flags int, to *RawSockaddrAny, tolen Socklen_t) (err error)
//sendto(s int, buf *byte, len Size_t, flags int, to *RawSockaddrAny, tolen Socklen_t) Ssize_t
func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
ptr, n, err := to.sockaddr()
if err != nil {
return err
}
return sendto(fd, p, flags, ptr, n)
}
//sys recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
//recvmsg(s int, msg *Msghdr, flags int) Ssize_t
func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
var msg Msghdr
var rsa RawSockaddrAny
msg.Name = (*byte)(unsafe.Pointer(&rsa))
msg.Namelen = uint32(SizeofSockaddrAny)
var iov Iovec
if len(p) > 0 {
iov.Base = (*byte)(unsafe.Pointer(&p[0]))
iov.SetLen(len(p))
}
var dummy byte
if len(oob) > 0 {
// receive at least one normal byte
if len(p) == 0 {
iov.Base = &dummy
iov.SetLen(1)
}
msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
msg.SetControllen(len(oob))
}
msg.Iov = &iov
msg.Iovlen = 1
if n, err = recvmsg(fd, &msg, flags); err != nil {
return
}
oobn = int(msg.Controllen)
recvflags = int(msg.Flags)
// source address is only specified if the socket is unconnected
if rsa.Addr.Family != AF_UNSPEC {
from, err = anyToSockaddr(&rsa)
}
return
}
//sys sendmsg(s int, msg *Msghdr, flags int) (err error)
//sendmsg(s int, msg *Msghdr, flags int) Ssize_t
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
var ptr *RawSockaddrAny
var salen Socklen_t
if to != nil {
var err error
ptr, salen, err = to.sockaddr()
if err != nil {
return err
}
}
var msg Msghdr
msg.Name = (*byte)(unsafe.Pointer(ptr))
msg.Namelen = uint32(salen)
var iov Iovec
if len(p) > 0 {
iov.Base = (*byte)(unsafe.Pointer(&p[0]))
iov.SetLen(len(p))
}
var dummy byte
if len(oob) > 0 {
// send at least one normal byte
if len(p) == 0 {
iov.Base = &dummy
iov.SetLen(1)
}
msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
msg.SetControllen(len(oob))
}
msg.Iov = &iov
msg.Iovlen = 1
if err = sendmsg(fd, &msg, flags); err != nil {
return
}
return
}
//sys Listen(fd int, n int) (err error)
//listen(fd int, n int) int
//sys Shutdown(fd int, how int) (err error)
//shutdown(fd int, how int) int
func (iov *Iovec) SetLen(length int) {
iov.Len = Iovec_len_t(length)
}
func (msghdr *Msghdr) SetControllen(length int) {
msghdr.Controllen = Msghdr_controllen_t(length)
}
func (cmsg *Cmsghdr) SetLen(length int) {
cmsg.Len = Cmsghdr_len_t(length)
}