| // Copyright 2015 The Vanadium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build linux |
| |
| package internal |
| |
| import ( |
| "net" |
| |
| "v.io/x/lib/vlog" |
| |
| "v.io/x/ref/profiles/internal/gce" |
| ) |
| |
| // GCEPublicAddress returns the public IP address of the GCE instance |
| // it is run from, or nil if run from anywhere else. The returned address |
| // is the public address of a 1:1 NAT tunnel to this host. |
| func GCEPublicAddress(log vlog.Logger) *net.IPAddr { |
| if !gce.RunningOnGCE() { |
| return nil |
| } |
| var pub *net.IPAddr |
| // Determine the IP address from GCE's metadata |
| if ip, err := gce.ExternalIPAddress(); err != nil { |
| log.Infof("failed to query GCE metadata: %s", err) |
| } else { |
| // 1:1 NAT case, our network config will not change. |
| pub = &net.IPAddr{IP: ip} |
| } |
| if pub == nil { |
| log.Infof("failed to determine public IP address to publish with") |
| } |
| return pub |
| } |