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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.

// (Raw) IP sockets

package net

// IPAddr represents the address of a IP end point.

type IPAddr struct {

        IP IP

}

// Network returns the address's network name, "ip".

func (a *IPAddr) Network() string { return "ip" }

func (a *IPAddr) String() string {

        if a == nil {

                return ""

        }

        return a.IP.String()

}

// ResolveIPAddr parses addr as a IP address and resolves domain

// names to numeric addresses on the network net, which must be

// "ip", "ip4" or "ip6".  A literal IPv6 host address must be

// enclosed in square brackets, as in "[::]".

func ResolveIPAddr(net, addr string) (*IPAddr, error) {

        ip, err := hostToIP(net, addr)

        if err != nil {

                return nil, err

        }

        return &IPAddr{ip}, nil

}

// Convert "host" into IP address.

func hostToIP(net, host string) (ip IP, err error) {

        var addr IP

        // Try as an IP address.

        addr = ParseIP(host)

        if addr == nil {

                filter := anyaddr

                if net != "" && net[len(net)-1] == '4' {

                        filter = ipv4only

                }

                if net != "" && net[len(net)-1] == '6' {

                        filter = ipv6only

                }

                // Not an IP address.  Try as a DNS name.

                addrs, err1 := LookupHost(host)

                if err1 != nil {

                        err = err1

                        goto Error

                }

                addr = firstFavoriteAddr(filter, addrs)

                if addr == nil {

                        // should not happen

                        err = &AddrError{"LookupHost returned no suitable address", addrs[0]}

                        goto Error

                }

        }

        return addr, nil

Error:

        return nil, err

}