github.com/wangyougui/gf/v2@v2.6.5/net/gipv4/gipv4_lookup.go (about)

     1  // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
     2  //
     3  // This Source Code Form is subject to the terms of the MIT License.
     4  // If a copy of the MIT was not distributed with this file,
     5  // You can obtain one at https://github.com/wangyougui/gf.
     6  //
     7  
     8  package gipv4
     9  
    10  import (
    11  	"net"
    12  	"strings"
    13  )
    14  
    15  // GetHostByName returns the IPv4 address corresponding to a given Internet host name.
    16  func GetHostByName(hostname string) (string, error) {
    17  	ips, err := net.LookupIP(hostname)
    18  	if ips != nil {
    19  		for _, v := range ips {
    20  			if v.To4() != nil {
    21  				return v.String(), nil
    22  			}
    23  		}
    24  		return "", nil
    25  	}
    26  	return "", err
    27  }
    28  
    29  // GetHostsByName returns a list of IPv4 addresses corresponding to a given Internet
    30  // host name.
    31  func GetHostsByName(hostname string) ([]string, error) {
    32  	ips, err := net.LookupIP(hostname)
    33  	if ips != nil {
    34  		var ipStrings []string
    35  		for _, v := range ips {
    36  			if v.To4() != nil {
    37  				ipStrings = append(ipStrings, v.String())
    38  			}
    39  		}
    40  		return ipStrings, nil
    41  	}
    42  	return nil, err
    43  }
    44  
    45  // GetNameByAddr returns the Internet host name corresponding to a given IP address.
    46  func GetNameByAddr(ipAddress string) (string, error) {
    47  	names, err := net.LookupAddr(ipAddress)
    48  	if names != nil {
    49  		return strings.TrimRight(names[0], "."), nil
    50  	}
    51  	return "", err
    52  }