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| <h2 title="Class SecurityUtil.QualifiedHostResolver" class="title">Class SecurityUtil.QualifiedHostResolver</h2> |
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| <li>org.apache.hadoop.security.SecurityUtil.QualifiedHostResolver</li> |
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| <pre>protected static class <span class="typeNameLabel">SecurityUtil.QualifiedHostResolver</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">This an alternate resolver with important properties that the standard |
| java resolver lacks: |
| 1) The hostname is fully qualified. This avoids security issues if not |
| all hosts in the cluster do not share the same search domains. It |
| also prevents other hosts from performing unnecessary dns searches. |
| In contrast, InetAddress simply returns the host as given. |
| 2) The InetAddress is instantiated with an exact host and IP to prevent |
| further unnecessary lookups. InetAddress may perform an unnecessary |
| reverse lookup for an IP. |
| 3) A call to getHostName() will always return the qualified hostname, or |
| more importantly, the IP if instantiated with an IP. This avoids |
| unnecessary dns timeouts if the host is not resolvable. |
| 4) Point 3 also ensures that if the host is re-resolved, ex. during a |
| connection re-attempt, that a reverse lookup to host and forward |
| lookup to IP is not performed since the reverse/forward mappings may |
| not always return the same IP. If the client initiated a connection |
| with an IP, then that IP is all that should ever be contacted. |
| |
| NOTE: this resolver is only used if: |
| hadoop.security.token.service.use_ip=false</div> |
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| <td class="colFirst"><code>protected </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/security/SecurityUtil.QualifiedHostResolver.html#QualifiedHostResolver--">QualifiedHostResolver</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/security/SecurityUtil.QualifiedHostResolver.html#getByName-java.lang.String-">getByName</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> host)</code> |
| <div class="block">Create an InetAddress with a fully qualified hostname of the given |
| hostname.</div> |
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| <a name="QualifiedHostResolver--"> |
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| <h4>QualifiedHostResolver</h4> |
| <pre>protected QualifiedHostResolver()</pre> |
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| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html?is-external=true" title="class or interface in java.net">InetAddress</a> getByName(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> host) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></pre> |
| <div class="block">Create an InetAddress with a fully qualified hostname of the given |
| hostname. InetAddress does not qualify an incomplete hostname that |
| is resolved via the domain search list. |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/net/InetAddress.html?is-external=true#getCanonicalHostName--" title="class or interface in java.net"><code>InetAddress.getCanonicalHostName()</code></a> will fully qualify the |
| hostname, but it always return the A record whereas the given hostname |
| may be a CNAME.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>host</code> - a hostname or ip address</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>InetAddress with the fully qualified hostname or ip</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/net/UnknownHostException.html?is-external=true" title="class or interface in java.net">UnknownHostException</a></code> - if host does not exist</dd> |
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