gcc/libgo/syscalls/socket.go
2011-03-16 23:05:44 +00:00

388 lines
9.7 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"
type RawSockaddrAny struct {
Addr RawSockaddr;
Pad [12]int8;
}
const SizeofSockaddrAny = 0x1c;
// 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, errno int); // lowercase; only we can define Sockaddrs
}
type SockaddrInet4 struct {
Port int;
Addr [4]byte;
raw RawSockaddrInet4;
}
type SockaddrInet6 struct {
Port int;
Addr [16]byte;
raw RawSockaddrInet6;
}
type SockaddrUnix struct {
Name string;
raw RawSockaddrUnix;
}
type Linger struct {
Onoff int32;
Linger int32;
}
func (sa *SockaddrInet4) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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, 0;
}
func (sa *SockaddrInet6) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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);
for i := 0; i < len(sa.Addr); i++ {
sa.raw.Addr[i] = sa.Addr[i];
}
return (*RawSockaddrAny)(unsafe.Pointer(&sa.raw)), n, 0;
}
func (sa *SockaddrUnix) sockaddr() (*RawSockaddrAny, Socklen_t, int) {
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, 0;
}
func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, int) {
switch rsa.Addr.Family {
case AF_UNIX:
pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
sa := new(SockaddrUnix)
n, err := pp.getLen()
if err != 0 {
return nil, err
}
bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]));
sa.Name = string(bytes[0:n]);
return sa, 0;
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, 0;
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, 0;
}
return nil, EAFNOSUPPORT;
}
func libc_accept(fd int, sa *RawSockaddrAny, len *Socklen_t) int __asm__ ("accept");
func libc_bind(fd int, sa *RawSockaddrAny, len Socklen_t) int __asm__ ("bind");
func libc_connect(fd int, sa *RawSockaddrAny, len Socklen_t) int __asm__ ("connect");
func libc_socket(domain, typ, protocol int) int __asm__ ("socket");
func libc_setsockopt(fd, level, optname int, optval *byte, optlen Socklen_t) int __asm__ ("setsockopt");
func libc_listen(fd, backlog int) int __asm__ ("listen");
func libc_getsockopt(fd, level, optname int, optval *byte, optlen *Socklen_t) int __asm__ ("getsockopt");
func libc_getsockname(fd int, sa *RawSockaddrAny, len *Socklen_t) int __asm__ ("getsockname");
func libc_getpeername(fd int, sa *RawSockaddrAny, len *Socklen_t) int __asm__ ("getpeername");
func libc_recv(fd int, buf *byte, len Size_t, flags int) Ssize_t __asm__ ("recv");
func libc_recvfrom(fd int, buf *byte, len Size_t, flags int,
from *RawSockaddrAny, fromlen *Socklen_t) Ssize_t __asm__("recvfrom");
func libc_recvmsg(fd int, msg *Msghdr, flags int) Ssize_t __asm__("recvmsg")
func libc_send(fd int, buf *byte, len Size_t, flags int) Ssize_t __asm__("send");
func libc_sendto(fd int, buf *byte, len Size_t, flags int,
to *RawSockaddrAny, tolen Socklen_t) Ssize_t __asm__("sendto");
func libc_sendmsg(fd int, msg *Msghdr, flags int) Ssize_t __asm__("sendmsg")
func libc_shutdown(fd int, how int) int __asm__ ("shutdown");
func Accept(fd int) (nfd int, sa Sockaddr, errno int) {
var rsa RawSockaddrAny;
var len Socklen_t = SizeofSockaddrAny;
nfd = libc_accept(fd, &rsa, &len);
if nfd < 0 {
errno = GetErrno();
return;
}
sa, errno = anyToSockaddr(&rsa);
if errno != 0 {
Close(nfd);
nfd = 0;
}
return;
}
func Bind(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr();
if err != 0 {
return err;
}
if libc_bind(fd, ptr, n) < 0 {
errno = GetErrno();
}
return;
}
func Connect(fd int, sa Sockaddr) (errno int) {
ptr, n, err := sa.sockaddr();
if err != 0 {
return err;
}
if libc_connect(fd, ptr, n) < 0 {
errno = GetErrno();
}
return;
}
func Socket(domain, typ, proto int) (fd, errno int) {
if domain == AF_INET6 && SocketDisableIPv6 {
return -1, EAFNOSUPPORT
}
fd = libc_socket(int(domain), int(typ), int(proto));
if fd < 0 {
errno = GetErrno();
}
return;
}
func Listen(fd int, n int) (errno int) {
r := libc_listen(int(fd), int(n));
if r < 0 { errno = GetErrno() }
return;
}
func setsockopt(fd, level, opt int, valueptr uintptr, length Socklen_t) (errno int) {
r := libc_setsockopt(fd, level, opt, (*byte)(unsafe.Pointer(valueptr)),
length);
if r < 0 { errno = GetErrno() }
return;
}
func SetsockoptInt(fd, level, opt int, value int) (errno int) {
var n = int32(value);
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&n)), 4);
}
func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(tv)), Socklen_t(unsafe.Sizeof(*tv)));
}
func SetsockoptLinger(fd, level, opt int, l *Linger) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(l)), Socklen_t(unsafe.Sizeof(*l)));
}
func SetsockoptString(fd, level, opt int, s string) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(&[]byte(s)[0])), Socklen_t(len(s)))
}
func SetsockoptIpMreq(fd, level, opt int, mreq *IpMreq) (errno int) {
return setsockopt(fd, level, opt, uintptr(unsafe.Pointer(mreq)), unsafe.Sizeof(*mreq))
}
func Getsockname(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny;
var len Socklen_t = SizeofSockaddrAny;
if libc_getsockname(fd, &rsa, &len) != 0 {
errno = GetErrno();
return;
}
return anyToSockaddr(&rsa);
}
func Getpeername(fd int) (sa Sockaddr, errno int) {
var rsa RawSockaddrAny;
var len Socklen_t = SizeofSockaddrAny;
if libc_getpeername(fd, &rsa, &len) != 0 {
errno = GetErrno();
return;
}
return anyToSockaddr(&rsa);
}
func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, errno int) {
var rsa RawSockaddrAny;
var slen Socklen_t = SizeofSockaddrAny;
var _p0 *byte;
if len(p) > 0 { _p0 = &p[0]; }
r := libc_recvfrom(fd, _p0, Size_t(len(p)), flags, &rsa, &slen);
n = int(r);
if r == -1 {
errno = GetErrno();
} else {
from, errno = anyToSockaddr(&rsa);
}
return;
}
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 Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, errno int) {
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, errno = recvmsg(fd, &msg, flags); errno != 0 {
return
}
oobn = int(msg.Controllen)
recvflags = int(msg.Flags)
// source address is only specified if the socket is unconnected
if rsa.Addr.Family != 0 {
from, errno = anyToSockaddr(&rsa)
}
return
}
func recvmsg(s int, msg *Msghdr, flags int) (n int, errno int) {
r := libc_recvmsg(s, msg, flags)
if r < 0 {
errno = GetErrno()
} else {
n = int(r)
}
return
}
func Sendto(fd int, p []byte, flags int, to Sockaddr) (errno int) {
ptr, n, err := to.sockaddr();
if err != 0 {
return err;
}
var _p0 *byte;
if len(p) > 0 { _p0 = &p[0]; }
r := libc_sendto(fd, _p0, Size_t(len(p)), flags, ptr, n);
if r == -1 { errno = GetErrno(); }
return;
}
func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (errno int) {
var ptr *RawSockaddrAny
var nsock Socklen_t
if to != nil {
var err int
ptr, nsock, err = to.sockaddr()
if err != 0 {
return err
}
}
var msg Msghdr
msg.Name = (*byte)(unsafe.Pointer(ptr))
msg.Namelen = uint32(nsock)
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 errno = sendmsg(fd, &msg, flags); errno != 0 {
return
}
return
}
func sendmsg(s int, msg *Msghdr, flags int) (errno int) {
if libc_sendmsg(s, msg, flags) < 0 {
errno = GetErrno()
}
return
}
func Shutdown(fd int, how int) (errno int) {
r := libc_shutdown(fd, how);
if r < 0 { errno = GetErrno() }
return;
}
// FIXME: No getsockopt.