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// 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.
// The net package provides a portable interface to Unix
// networks sockets, including TCP/IP, UDP, domain name
// resolution, and Unix domain sockets.
package net
// TODO(rsc):
// support for raw IP sockets
// support for raw ethernet sockets
import "os"
// Addr represents a network end point address.
type Addr interface {
Network() string; // name of the network
String() string; // string form of address
}
// Conn is a generic stream-oriented network connection.
type Conn interface {
// Read reads data from the connection.
// Read can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
Read(b []byte) (n int, err os.Error);
// Write writes data to the connection.
// Write can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
Write(b []byte) (n int, err os.Error);
// Close closes the connection.
Close() os.Error;
// LocalAddr returns the local network address.
LocalAddr() Addr;
// RemoteAddr returns the remote network address.
RemoteAddr() Addr;
// SetTimeout sets the read and write deadlines associated
// with the connection.
SetTimeout(nsec int64) os.Error;
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
SetReadTimeout(nsec int64) os.Error;
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteTimeout(nsec int64) os.Error;
}
// PacketConn is a generic packet-oriented network connection.
type PacketConn interface {
// ReadFrom reads a packet from the connection,
// copying the payload into b. It returns the number of
// bytes copied into b and the return address that
// was on the packet.
// ReadFrom can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetReadTimeout.
ReadFrom(b []byte) (n int, addr Addr, err os.Error);
// WriteTo writes a packet with payload b to addr.
// WriteTo can be made to time out and return err == os.EAGAIN
// after a fixed time limit; see SetTimeout and SetWriteTimeout.
// On packet-oriented connections, write timeouts are rare.
WriteTo(b []byte, addr Addr) (n int, err os.Error);
// Close closes the connection.
Close() os.Error;
// LocalAddr returns the local network address.
LocalAddr() Addr;
// SetTimeout sets the read and write deadlines associated
// with the connection.
SetTimeout(nsec int64) os.Error;
// SetReadTimeout sets the time (in nanoseconds) that
// Read will wait for data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
SetReadTimeout(nsec int64) os.Error;
// SetWriteTimeout sets the time (in nanoseconds) that
// Write will wait to send its data before returning os.EAGAIN.
// Setting nsec == 0 (the default) disables the deadline.
// Even if write times out, it may return n > 0, indicating that
// some of the data was successfully written.
SetWriteTimeout(nsec int64) os.Error;
}
// A Listener is a generic network listener for stream-oriented protocols.
// Accept waits for the next connection and Close closes the connection.
type Listener interface {
Accept() (c Conn, err os.Error);
Close() os.Error;
Addr() Addr; // Listener's network address
}
// Dial connects to the remote address raddr on the network net.
// If the string laddr is not empty, it is used as the local address
// for the connection.
//
// Known networks are "tcp", "tcp4" (IPv4-only), "tcp6" (IPv6-only),
// "udp", "udp4" (IPv4-only), and "udp6" (IPv6-only).
//
// For IP networks, addresses have the form host:port. If host is
// a literal IPv6 address, it must be enclosed in square brackets.
//
// Examples:
// Dial("tcp", "", "12.34.56.78:80")
// Dial("tcp", "", "google.com:80")
// Dial("tcp", "", "[de:ad:be:ef::ca:fe]:80")
// Dial("tcp", "127.0.0.1:123", "127.0.0.1:88")
//
func Dial(net, laddr, raddr string) (c Conn, err os.Error) {
switch net {
case "tcp", "tcp4", "tcp6":
var la, ra *TCPAddr;
if laddr != "" {
if la, err = ResolveTCPAddr(laddr); err != nil {
goto Error
}
}
if raddr != "" {
if ra, err = ResolveTCPAddr(raddr); err != nil {
goto Error
}
}
return DialTCP(net, la, ra);
case "udp", "udp4", "upd6":
var la, ra *UDPAddr;
if laddr != "" {
if la, err = ResolveUDPAddr(laddr); err != nil {
goto Error
}
}
if raddr != "" {
if ra, err = ResolveUDPAddr(raddr); err != nil {
goto Error
}
}
return DialUDP(net, la, ra);
case "unix", "unixgram":
var la, ra *UnixAddr;
if raddr != "" {
if ra, err = ResolveUnixAddr(net, raddr); err != nil {
goto Error
}
}
if laddr != "" {
if la, err = ResolveUnixAddr(net, laddr); err != nil {
goto Error
}
}
return DialUnix(net, la, ra);
}
err = UnknownNetworkError(net);
Error:
return nil, &OpError{"dial", net + " " + raddr, nil, err};
}
// Listen announces on the local network address laddr.
// The network string net must be a stream-oriented
// network: "tcp", "tcp4", "tcp6", or "unix".
func Listen(net, laddr string) (l Listener, err os.Error) {
switch net {
case "tcp", "tcp4", "tcp6":
var la *TCPAddr;
if laddr != "" {
if la, err = ResolveTCPAddr(laddr); err != nil {
return nil, err
}
}
l, err := ListenTCP(net, la);
if err != nil {
return nil, err
}
return l, nil;
case "unix":
var la *UnixAddr;
if laddr != "" {
if la, err = ResolveUnixAddr(net, laddr); err != nil {
return nil, err
}
}
l, err := ListenUnix(net, la);
if err != nil {
return nil, err
}
return l, nil;
}
return nil, UnknownNetworkError(net);
}
// ListenPacket announces on the local network address laddr.
// The network string net must be a packet-oriented network:
// "udp", "udp4", "udp6", or "unixgram".
func ListenPacket(net, laddr string) (c PacketConn, err os.Error) {
switch net {
case "udp", "udp4", "udp6":
var la *UDPAddr;
if laddr != "" {
if la, err = ResolveUDPAddr(laddr); err != nil {
return nil, err
}
}
c, err := ListenUDP(net, la);
if err != nil {
return nil, err
}
return c, nil;
case "unixgram":
var la *UnixAddr;
if laddr != "" {
if la, err = ResolveUnixAddr(net, laddr); err != nil {
return nil, err
}
}
c, err := DialUnix(net, la, nil);
if err != nil {
return nil, err
}
return c, nil;
}
return nil, UnknownNetworkError(net);
}
var errMissingAddress = os.ErrorString("missing address")
type OpError struct {
Op string;
Net string;
Addr Addr;
Error os.Error;
}
func (e *OpError) String() string {
s := e.Op;
if e.Net != "" {
s += " " + e.Net
}
if e.Addr != nil {
s += " " + e.Addr.String()
}
s += ": " + e.Error.String();
return s;
}
type AddrError struct {
Error string;
Addr string;
}
func (e *AddrError) String() string {
s := e.Error;
if e.Addr != "" {
s += " " + e.Addr
}
return s;
}
type UnknownNetworkError string
func (e UnknownNetworkError) String() string { return "unknown network " + string(e) }
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