blob: 3e105ad4abde4ec8fd2b53471f52d61b2858115f [file] [log] [blame]
// 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.
// Sockets
package net
import (
"os"
"reflect"
"syscall"
)
// Boolean to int.
func boolint(b bool) int {
if b {
return 1
}
return 0
}
// Generic socket creation.
func socket(net string, f, p, t int, la, ra syscall.Sockaddr, toAddr func(syscall.Sockaddr) Addr) (fd *netFD, err os.Error) {
// See ../syscall/exec.go for description of ForkLock.
syscall.ForkLock.RLock()
s, e := syscall.Socket(f, p, t)
if e != 0 {
syscall.ForkLock.RUnlock()
return nil, os.Errno(e)
}
syscall.CloseOnExec(s)
syscall.ForkLock.RUnlock()
// Allow reuse of recently-used addresses.
syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
// Allow broadcast.
syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1)
if f == syscall.AF_INET6 {
// using ip, tcp, udp, etc.
// allow both protocols even if the OS default is otherwise.
syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, 0)
}
if la != nil {
e = syscall.Bind(s, la)
if e != 0 {
syscall.Close(s)
return nil, os.Errno(e)
}
}
if ra != nil {
e = syscall.Connect(s, ra)
if e != 0 {
syscall.Close(s)
return nil, os.Errno(e)
}
}
sa, _ := syscall.Getsockname(s)
laddr := toAddr(sa)
sa, _ = syscall.Getpeername(s)
raddr := toAddr(sa)
fd, err = newFD(s, f, p, net, laddr, raddr)
if err != nil {
syscall.Close(s)
return nil, err
}
return fd, nil
}
func setsockoptInt(fd, level, opt int, value int) os.Error {
return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(fd, level, opt, value))
}
func setsockoptNsec(fd, level, opt int, nsec int64) os.Error {
var tv = syscall.NsecToTimeval(nsec)
return os.NewSyscallError("setsockopt", syscall.SetsockoptTimeval(fd, level, opt, &tv))
}
func setReadBuffer(fd *netFD, bytes int) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
}
func setWriteBuffer(fd *netFD, bytes int) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes)
}
func setReadTimeout(fd *netFD, nsec int64) os.Error {
fd.rdeadline_delta = nsec
return nil
}
func setWriteTimeout(fd *netFD, nsec int64) os.Error {
fd.wdeadline_delta = nsec
return nil
}
func setTimeout(fd *netFD, nsec int64) os.Error {
if e := setReadTimeout(fd, nsec); e != nil {
return e
}
return setWriteTimeout(fd, nsec)
}
func setReuseAddr(fd *netFD, reuse bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, boolint(reuse))
}
func bindToDevice(fd *netFD, dev string) os.Error {
// TODO(rsc): call setsockopt with null-terminated string pointer
return os.EINVAL
}
func setDontRoute(fd *netFD, dontroute bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_DONTROUTE, boolint(dontroute))
}
func setKeepAlive(fd *netFD, keepalive bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))
}
func setNoDelay(fd *netFD, noDelay bool) os.Error {
fd.incref()
defer fd.decref()
return setsockoptInt(fd.sysfd, syscall.IPPROTO_TCP, syscall.TCP_NODELAY, boolint(noDelay))
}
func setLinger(fd *netFD, sec int) os.Error {
var l syscall.Linger
if sec >= 0 {
l.Onoff = 1
l.Linger = int32(sec)
} else {
l.Onoff = 0
l.Linger = 0
}
fd.incref()
defer fd.decref()
e := syscall.SetsockoptLinger(fd.sysfd, syscall.SOL_SOCKET, syscall.SO_LINGER, &l)
return os.NewSyscallError("setsockopt", e)
}
type UnknownSocketError struct {
sa syscall.Sockaddr
}
func (e *UnknownSocketError) String() string {
return "unknown socket address type " + reflect.Typeof(e.sa).String()
}
func sockaddrToString(sa syscall.Sockaddr) (name string, err os.Error) {
switch a := sa.(type) {
case *syscall.SockaddrInet4:
return joinHostPort(IP(a.Addr[0:]).String(), itoa(a.Port)), nil
case *syscall.SockaddrInet6:
return joinHostPort(IP(a.Addr[0:]).String(), itoa(a.Port)), nil
case *syscall.SockaddrUnix:
return a.Name, nil
}
return "", &UnknownSocketError{sa}
}