132 lines
2.7 KiB
Go
132 lines
2.7 KiB
Go
/*
|
|
* Copyright 2022 The Dragonfly 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 ip
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
|
|
logger "d7y.io/dragonfly/v2/internal/dflog"
|
|
)
|
|
|
|
var IPv4 string
|
|
|
|
const (
|
|
internalIPv4 = "127.0.0.1"
|
|
)
|
|
|
|
func init() {
|
|
ip, err := externalIPv4()
|
|
if err != nil {
|
|
logger.Warnf("Failed to get IPv4 address: %s", err.Error())
|
|
logger.Infof("Use %s as IPv4 addr", internalIPv4)
|
|
IPv4 = internalIPv4
|
|
} else {
|
|
IPv4 = ip
|
|
}
|
|
}
|
|
|
|
// externalIPv4 returns the available IPv4.
|
|
func externalIPv4() (string, error) {
|
|
ips, err := ipAddrs()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
var externalIPs []string
|
|
for _, ip := range ips {
|
|
ip = ip.To4()
|
|
if ip == nil {
|
|
continue // not an ipv4 address
|
|
}
|
|
externalIPs = append(externalIPs, ip.String())
|
|
}
|
|
|
|
if len(externalIPs) == 0 {
|
|
return "", fmt.Errorf("can not found external ipv4")
|
|
}
|
|
|
|
return externalIPs[0], nil
|
|
}
|
|
|
|
// ipAddrs returns all the valid IPs available.
|
|
// refer to https://github.com/dragonflyoss/Dragonfly2/pull/652
|
|
func ipAddrs() ([]net.IP, error) {
|
|
// use prefer ip possible
|
|
var prefers []net.IP
|
|
host, err := os.Hostname()
|
|
if err == nil {
|
|
ips, _ := net.LookupIP(host)
|
|
for _, ip := range ips {
|
|
if ip == nil || ip.IsLoopback() || ip.IsLinkLocalUnicast() {
|
|
continue
|
|
}
|
|
prefers = append(prefers, ip)
|
|
}
|
|
}
|
|
|
|
ifaces, err := net.Interfaces()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var preferIPs []net.IP
|
|
var normalIPs []net.IP
|
|
for _, iface := range ifaces {
|
|
if iface.Flags&net.FlagUp == 0 {
|
|
continue // interface down
|
|
}
|
|
if iface.Flags&net.FlagLoopback != 0 {
|
|
continue // loopback interface
|
|
}
|
|
|
|
addrs, err := iface.Addrs()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
for _, addr := range addrs {
|
|
var ip net.IP
|
|
switch v := addr.(type) {
|
|
case *net.IPNet:
|
|
ip = v.IP
|
|
case *net.IPAddr:
|
|
ip = v.IP
|
|
}
|
|
if ip == nil || ip.IsLoopback() || ip.IsLinkLocalUnicast() {
|
|
continue
|
|
}
|
|
|
|
var isPrefer bool
|
|
for _, preferAddr := range prefers {
|
|
if preferAddr.Equal(ip) {
|
|
isPrefer = true
|
|
}
|
|
}
|
|
|
|
if isPrefer {
|
|
preferIPs = append(preferIPs, ip)
|
|
} else {
|
|
normalIPs = append(normalIPs, ip)
|
|
}
|
|
}
|
|
}
|
|
|
|
return append(preferIPs, normalIPs...), nil
|
|
}
|