Subversion Repositories openrisc

// 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 "<nil>"
        }
        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
}