英文:
how to get hostname from IP address?
问题
我正在尝试从IP地址获取主机名，但总是出现以下错误：
错误：无法获取主机名，错误查找 220.220.103.65.in-addr.arpa.：没有这样的主机，IP地址为 65.103.220.220
代码如下：
var hostname string
hostnames, err := net.LookupAddr(c.ip)
if err != nil {
glog.Errorf("错误：无法获取主机名，错误 %v，IP地址 %v", err, c.ip)
} else {
hostname = strings.Join(hostnames, " ")
}
英文:
I'm trying to get the hostname from Ip address but I always get error below :
err couln't get hostnames,err lookup 220.220.103.65.in-addr.arpa.: no such host,ip 65.103.220.220
The code :
var hostname string
hostnames, err := net.LookupAddr(c.ip)
if err != nil {
glog.Errorf("err couln't get hostnames,err %v,ip %v", err, c.ip)
} else {
hostname = strings.Join(hostnames, " ")
}
答案1
得分: 7
这不是一个错误，而是一个简单的陈述，即你正在寻找的IP地址没有PTR记录。并没有要求互联网上的每台机器都有PTR记录，并且尝试从IP地址查找名称并不保证成功。
简而言之，你的代码不会始终返回一个名称，你无法做任何事情来解决这个问题。
无论你使用机器名称做什么，你都不能依赖它。找到一种不同的方法。
英文:
That's not an error but a simple statement that the IP address you're looking for has no PTR record. There's no requirement that every machine on the Internet has a PTR record, and no guarantee that trying to find a name from the IP address will succeed.
In short, your code won't always return a name and there's nothing you can do about it.
Whatever it is you're using the machine name for, you can't rely on it. Find a different way.
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