youtubebeat/vendor/github.com/elastic/beats/libbeat/common/net.go

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2018-11-18 11:08:38 +01:00
// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 common
import (
"fmt"
"net"
)
// LocalIPAddrs finds the IP addresses of the hosts on which
// the shipper currently runs on.
func LocalIPAddrs() ([]net.IP, error) {
var localIPAddrs []net.IP
ipaddrs, err := net.InterfaceAddrs()
if err != nil {
return nil, err
}
for _, addr := range ipaddrs {
var ip net.IP
ok := true
switch v := addr.(type) {
case *net.IPNet:
ip = v.IP
case *net.IPAddr:
ip = v.IP
default:
ok = false
}
if !ok {
continue
}
localIPAddrs = append(localIPAddrs, ip)
}
return localIPAddrs, nil
}
// LocalIPAddrsAsStrings finds the IP addresses of the hosts on which
// the shipper currently runs on and returns them as an array of
// strings.
func LocalIPAddrsAsStrings(includeLoopbacks bool) ([]string, error) {
var localIPAddrsStrings = []string{}
var err error
ipaddrs, err := LocalIPAddrs()
if err != nil {
return []string{}, err
}
for _, ipaddr := range ipaddrs {
if includeLoopbacks || !ipaddr.IsLoopback() {
localIPAddrsStrings = append(localIPAddrsStrings, ipaddr.String())
}
}
return localIPAddrsStrings, err
}
// IsLoopback check if a particular IP notation corresponds
// to a loopback interface.
func IsLoopback(ipStr string) (bool, error) {
ip := net.ParseIP(ipStr)
if ip == nil {
return false, fmt.Errorf("Wrong IP format %s", ipStr)
}
return ip.IsLoopback(), nil
}