From 621e49bb465f500cc46d47e39e828cf76d6381d7 Mon Sep 17 00:00:00 2001 From: Dimitri Sokolyuk Date: Tue, 24 Jul 2018 14:35:44 +0200 Subject: update vendor --- .../golang.org/x/net/internal/nettest/interface.go | 94 ++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 vendor/golang.org/x/net/internal/nettest/interface.go (limited to 'vendor/golang.org/x/net/internal/nettest/interface.go') diff --git a/vendor/golang.org/x/net/internal/nettest/interface.go b/vendor/golang.org/x/net/internal/nettest/interface.go new file mode 100644 index 0000000..8e6333a --- /dev/null +++ b/vendor/golang.org/x/net/internal/nettest/interface.go @@ -0,0 +1,94 @@ +// Copyright 2012 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 nettest + +import "net" + +// IsMulticastCapable reports whether ifi is an IP multicast-capable +// network interface. Network must be "ip", "ip4" or "ip6". +func IsMulticastCapable(network string, ifi *net.Interface) (net.IP, bool) { + switch network { + case "ip", "ip4", "ip6": + default: + return nil, false + } + if ifi == nil || ifi.Flags&net.FlagUp == 0 || ifi.Flags&net.FlagMulticast == 0 { + return nil, false + } + return hasRoutableIP(network, ifi) +} + +// RoutedInterface returns a network interface that can route IP +// traffic and satisfies flags. It returns nil when an appropriate +// network interface is not found. Network must be "ip", "ip4" or +// "ip6". +func RoutedInterface(network string, flags net.Flags) *net.Interface { + switch network { + case "ip", "ip4", "ip6": + default: + return nil + } + ift, err := net.Interfaces() + if err != nil { + return nil + } + for _, ifi := range ift { + if ifi.Flags&flags != flags { + continue + } + if _, ok := hasRoutableIP(network, &ifi); !ok { + continue + } + return &ifi + } + return nil +} + +func hasRoutableIP(network string, ifi *net.Interface) (net.IP, bool) { + ifat, err := ifi.Addrs() + if err != nil { + return nil, false + } + for _, ifa := range ifat { + switch ifa := ifa.(type) { + case *net.IPAddr: + if ip := routableIP(network, ifa.IP); ip != nil { + return ip, true + } + case *net.IPNet: + if ip := routableIP(network, ifa.IP); ip != nil { + return ip, true + } + } + } + return nil, false +} + +func routableIP(network string, ip net.IP) net.IP { + if !ip.IsLoopback() && !ip.IsLinkLocalUnicast() && !ip.IsGlobalUnicast() { + return nil + } + switch network { + case "ip4": + if ip := ip.To4(); ip != nil { + return ip + } + case "ip6": + if ip.IsLoopback() { // addressing scope of the loopback address depends on each implementation + return nil + } + if ip := ip.To16(); ip != nil && ip.To4() == nil { + return ip + } + default: + if ip := ip.To4(); ip != nil { + return ip + } + if ip := ip.To16(); ip != nil { + return ip + } + } + return nil +} -- cgit v1.2.3