获取 Java 中 DNS 查找的名称服务器信息

发布于 2024-08-08 02:29:43 字数 191 浏览 0 评论 0原文

如果我按如下方式从 DNS 名称查找 IP 地址：

InetAddress inetAddress = InetAddress.getByName(name);
String address = inetAddress.getHostAddress();

我可以找出哪个名称服务器向我提供了该信息吗？

原文

If I look up a IP address from a DNS name as follows:

InetAddress inetAddress = InetAddress.getByName(name);
String address = inetAddress.getHostAddress();

Can I find out which nameserver gave me the information?

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清秋悲枫 2024-08-15 02:29:43

我不确定这是否是您想要的，但是有一个 DNSJava 库，它在 Java 中提供 DNS 功能。也许您可以使用它来更好地理解您的问题，或者实施特定的解决方案？就像我说的，这不是你的完美匹配，但也许有帮助。

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一片旧的回忆 2024-08-15 02:29:43

对于给定的 InetAddress，请尝试以下操作：

// get the default initial Directory Context
InitialDirContext idc = new InitialDirContext();
// get the DNS records for inetAddress
Attributes attributes = idc.getAttributes("dns:/" + inetAddress.getHostName());
// get an enumeration of the attributes and print them out
NamingEnumeration attributeEnumeration = attributes.getAll();
System.out.println("-- DNS INFORMATION --");
while (attributeEnumeration.hasMore()) {
    System.out.println("" + attributeEnumeration.next());
}
attributeEnumeration.close();

调整它以获取您要查找的内容。

For a given InetAddress, try the following:

// get the default initial Directory Context
InitialDirContext idc = new InitialDirContext();
// get the DNS records for inetAddress
Attributes attributes = idc.getAttributes("dns:/" + inetAddress.getHostName());
// get an enumeration of the attributes and print them out
NamingEnumeration attributeEnumeration = attributes.getAll();
System.out.println("-- DNS INFORMATION --");
while (attributeEnumeration.hasMore()) {
    System.out.println("" + attributeEnumeration.next());
}
attributeEnumeration.close();

Adapt it to pick up what you're looking for.

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献世佛 2024-08-15 02:29:43

你需要一个命名上下文。您可以选择指定 DNS 服务器。
即使这样，您也需要选择您正在寻找的内容。这是一个例子。

final String ADDR_ATTRIB = "A";
final String[] ADDR_ATTRIBS = {ADDR_ATTRIB};
final Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.dns.DnsContextFactory");
idc = new InitialDirContext(env);
env.put(Context.PROVIDER_URL, "dns://"+dnsServer);
final List<String> ipAddresses = new LinkedList<>();
final Attributes attrs = idc.getAttributes(hostname, ADDR_ATTRIBS);
final Attribute attr = attrs.get(ADDR_ATTRIB);
if (attr != null) for (int i = 0; i < attr.size(); i++)  ipAddresses.add((String) attr.get(i));

you need an Naming Context. Optional you can Specify the DNS Server.
And even then you need to select that you are looking for. Here is an example.

final String ADDR_ATTRIB = "A";
final String[] ADDR_ATTRIBS = {ADDR_ATTRIB};
final Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.dns.DnsContextFactory");
idc = new InitialDirContext(env);
env.put(Context.PROVIDER_URL, "dns://"+dnsServer);
final List<String> ipAddresses = new LinkedList<>();
final Attributes attrs = idc.getAttributes(hostname, ADDR_ATTRIBS);
final Attribute attr = attrs.get(ADDR_ATTRIB);
if (attr != null) for (int i = 0; i < attr.size(); i++)  ipAddresses.add((String) attr.get(i));

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