Imported Upstream version 60upstream/60

1 files changed, 69 insertions, 0 deletions

diff --git a/src/pkg/net/iprawsock.go b/src/pkg/net/iprawsock.go
new file mode 100644
index 000000000..662b9f57b
--- /dev/null
+++ b/src/pkg/net/iprawsock.go
@@ -0,0 +1,69 @@
+// 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
+
+import (
+	"os"
+)
+
+// 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, os.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 os.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
+}