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net.go
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net.go
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// Copyright 2017 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package proxy
import (
"net"
"time"
)
// Network-related utility functions
const (
waitInterval = 100 * time.Millisecond
waitTimeout = 2 * time.Minute
)
// GetPrivateIP returns a private IP address, or panics if no IP is available.
func GetPrivateIP() net.IP {
addr := getPrivateIPIfAvailable()
if addr.IsUnspecified() {
panic("No private IP address is available")
}
return addr
}
// WaitForPrivateNetwork blocks until a private IP address is available, or a timeout is reached.
// Returns 'true' if a private IP is available before timeout is reached, and 'false' otherwise.
func WaitForPrivateNetwork() bool {
deadline := time.Now().Add(waitTimeout)
for {
addr := getPrivateIPIfAvailable()
if !addr.IsUnspecified() {
return true
}
if time.Now().After(deadline) {
return false
}
time.Sleep(waitInterval)
}
}
// Returns a private IP address, or unspecified IP (0.0.0.0) if no IP is available
func getPrivateIPIfAvailable() net.IP {
addrs, _ := net.InterfaceAddrs()
for _, addr := range addrs {
var ip net.IP
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
default:
continue
}
if !ip.IsLoopback() {
return ip
}
}
return net.IPv4zero
}