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// Copyright 2010 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.
package net
func resolveNetAddr(op, net, addr string) (a Addr, err error) {
if addr == "" {
return nil, &OpError{op, net, nil, errMissingAddress}
}
switch net {
case "tcp", "tcp4", "tcp6":
a, err = ResolveTCPAddr(net, addr)
case "udp", "udp4", "udp6":
a, err = ResolveUDPAddr(net, addr)
case "unix", "unixgram", "unixpacket":
a, err = ResolveUnixAddr(net, addr)
case "ip", "ip4", "ip6":
a, err = ResolveIPAddr(net, addr)
default:
err = UnknownNetworkError(net)
}
if err != nil {
return nil, &OpError{op, net + " " + addr, nil, err}
}
return
}
// Dial connects to the address addr on the network net.
//
// Known networks are "tcp", "tcp4" (IPv4-only), "tcp6" (IPv6-only),
// "udp", "udp4" (IPv4-only), "udp6" (IPv6-only), "ip", "ip4"
// (IPv4-only), "ip6" (IPv6-only), "unix" and "unixgram".
//
// For IP networks, addresses have the form host:port. If host is
// a literal IPv6 address, it must be enclosed in square brackets.
// The functions JoinHostPort and SplitHostPort manipulate
// addresses in this form.
//
// Examples:
// Dial("tcp", "12.34.56.78:80")
// Dial("tcp", "google.com:80")
// Dial("tcp", "[de:ad:be:ef::ca:fe]:80")
//
func Dial(net, addr string) (c Conn, err error) {
addri, err := resolveNetAddr("dial", net, addr)
if err != nil {
return nil, err
}
switch ra := addri.(type) {
case *TCPAddr:
c, err = DialTCP(net, nil, ra)
case *UDPAddr:
c, err = DialUDP(net, nil, ra)
case *UnixAddr:
c, err = DialUnix(net, nil, ra)
case *IPAddr:
c, err = DialIP(net, nil, ra)
default:
err = &OpError{"dial", net + " " + addr, nil, UnknownNetworkError(net)}
}
if err != nil {
return nil, err
}
return
}
// Listen announces on the local network address laddr.
// The network string net must be a stream-oriented
// network: "tcp", "tcp4", "tcp6", or "unix", or "unixpacket".
func Listen(net, laddr string) (l Listener, err error) {
switch net {
case "tcp", "tcp4", "tcp6":
var la *TCPAddr
if laddr != "" {
if la, err = ResolveTCPAddr(net, laddr); err != nil {
return nil, err
}
}
l, err := ListenTCP(net, la)
if err != nil {
return nil, err
}
return l, nil
case "unix", "unixpacket":
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 error) {
switch net {
case "udp", "udp4", "udp6":
var la *UDPAddr
if laddr != "" {
if la, err = ResolveUDPAddr(net, 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
}
var rawnet string
if rawnet, _, err = splitNetProto(net); err != nil {
switch rawnet {
case "ip", "ip4", "ip6":
var la *IPAddr
if laddr != "" {
if la, err = ResolveIPAddr(rawnet, laddr); err != nil {
return nil, err
}
}
c, err := ListenIP(net, la)
if err != nil {
return nil, err
}
return c, nil
}
}
return nil, UnknownNetworkError(net)
}
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