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| <h1 id="51---blacklist-filter">5.1 - Blacklist Filter</h1> |
| <p>This filter blocks connections from blacklisted remote addresses. One can block <em>Addresses</em> or <em>Subnets</em>. In any case, when an event happens on a blocked session, the session will simply be closed. Here are the events this filter handles :</p> |
| <ul> |
| <li><em>event</em> (MINA 2.1)</li> |
| <li><em>messageReceived</em></li> |
| <li><em>messageSent</em></li> |
| <li><em>sessionCreated</em></li> |
| <li><em>sessionIdle</em></li> |
| <li><em>sessionOpened</em></li> |
| </ul> |
| <p>There is no need to handle any other event.</p> |
| <h2 id="blocking-an-address">Blocking an address</h2> |
| <p>Any address or subnet can be blocked live, ie it does not matter if a session is already active or not, this dynamically activated. |
| It’s enough to add the filter in the chain, and to set (or unset) the addresses to block:</p> |
| <div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#666">.</span><span style="color:#666">.</span><span style="color:#666">.</span> |
| BlacklistFilter blackList <span style="color:#666">=</span> <span style="color:#a2f;font-weight:bold">new</span> BlacklistFilter<span style="color:#666">(</span><span style="color:#666">)</span><span style="color:#666">;</span> |
| blackList<span style="color:#666">.</span><span style="color:#b44">block</span><span style="color:#666">(</span>InetAddress<span style="color:#666">.</span><span style="color:#b44">getByName</span><span style="color:#666">(</span><span style="color:#b44">"1.2.3.4"</span><span style="color:#666">)</span><span style="color:#666">)</span><span style="color:#666">;</span> |
| acceptor<span style="color:#666">.</span><span style="color:#b44">getFilterChain</span><span style="color:#666">(</span><span style="color:#666">)</span><span style="color:#666">.</span><span style="color:#b44">addLast</span><span style="color:#666">(</span><span style="color:#b44">"blacklist"</span><span style="color:#666">,</span> <span style="color:#a2f;font-weight:bold">new</span> BlacklistFilter<span style="color:#666">(</span><span style="color:#666">)</span><span style="color:#666">)</span><span style="color:#666">;</span> |
| <span style="color:#666">.</span><span style="color:#666">.</span><span style="color:#666">.</span> |
| </code></pre></div><p>Here, the “1.2.3.4” address will be blocked.</p> |
| <h2 id="unblocking-an-address">Unblocking an address</h2> |
| <p>It’s possible to unblock an address, it’s just a matter of fetching the filter and remove a previously blocked address:</p> |
| <div class="highlight"><pre style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-java" data-lang="java"><span style="color:#666">.</span><span style="color:#666">.</span><span style="color:#666">.</span> |
| BlacklistFilter blackList <span style="color:#666">=</span> <span style="color:#666">(</span>BlacklistFilter<span style="color:#666">)</span>session<span style="color:#666">.</span><span style="color:#b44">getFilterChain</span><span style="color:#666">(</span><span style="color:#666">)</span><span style="color:#666">.</span><span style="color:#b44">get</span><span style="color:#666">(</span>BlacklistFilter<span style="color:#666">.</span><span style="color:#b44">class</span><span style="color:#666">)</span><span style="color:#666">;</span> |
| blackList<span style="color:#666">.</span><span style="color:#b44">unblock</span><span style="color:#666">(</span>InetAddress<span style="color:#666">.</span><span style="color:#b44">getByName</span><span style="color:#666">(</span><span style="color:#b44">"1.2.3.4"</span><span style="color:#666">)</span><span style="color:#666">)</span><span style="color:#666">;</span> |
| <span style="color:#666">.</span><span style="color:#666">.</span><span style="color:#666">.</span> |
| </code></pre></div><p>Here, the “1.2.3.4” address will be unblocked.</p> |
| <h2 id="performances">Performances</h2> |
| <p>Currently, the implementation is not really optimal… We use a <em>List</em> to store the blocked addresses/subnet, so the more of them you have in the list the longer it will take to process any event.</p> |
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