gf/net/gipv4/gipv4_lookup.go

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2021-01-17 21:46:25 +08:00
// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
//
package gipv4
import (
"net"
"strings"
)
// GetHostByName returns the IPv4 address corresponding to a given Internet host name.
func GetHostByName(hostname string) (string, error) {
ips, err := net.LookupIP(hostname)
if ips != nil {
for _, v := range ips {
if v.To4() != nil {
return v.String(), nil
}
}
return "", nil
}
return "", err
}
// GetHostsByName returns a list of IPv4 addresses corresponding to a given Internet
// host name.
func GetHostsByName(hostname string) ([]string, error) {
ips, err := net.LookupIP(hostname)
if ips != nil {
var ipStrings []string
for _, v := range ips {
if v.To4() != nil {
ipStrings = append(ipStrings, v.String())
}
}
return ipStrings, nil
}
return nil, err
}
// GetNameByAddr returns the Internet host name corresponding to a given IP address.
func GetNameByAddr(ipAddress string) (string, error) {
names, err := net.LookupAddr(ipAddress)
if names != nil {
return strings.TrimRight(names[0], "."), nil
}
return "", err
}