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a17e9cc8c0
When using dig to determine the metrics of my servers, e.g. "dig txt metrics.status.sslip.io @ns-ovh.sslip.io +short", one record looks particularly heinous: ``` "Answer \226\137\165 1: 67974722 (651.9/s)" ``` It's supposed to look like this: ``` "Answer ≥ 1: 67974722 (651.9/s)" ``` `dig` doesn't handle Unicode well. So I'm replacing "Answer ≥ 1" with "Answer > 0". No Unicode. It was a worthy effort, but ultimately failed.
392 lines
20 KiB
HTML
392 lines
20 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<!-- The above 3 meta tags *must* come first in the head; any
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other head content must come *after* these tags -->
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<title>Welcome to sslip.io</title>
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<meta name="description" content="sslip.io">
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<meta name="author" content="Brian Cunnie"><!-- cute Green Lock icon -->
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<link rel="shortcut icon" type="image/x-icon" href="img/favicon.ico"><!-- Latest
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compiled and minified CSS -->
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"><!--
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Optional theme -->
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<link rel="stylesheet" href="css/starter-template.css"><!--
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HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
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<!--
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WARNING: Respond.js doesn't work if you view the page via file:// -->
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<!--[if lt
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IE 9]> <script
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src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script> <script
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src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script> <![endif]-->
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</head>
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<body>
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<nav class="navbar navbar-inverse navbar-fixed-top">
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<div class="container">
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<div class="navbar-header">
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<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar"
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aria-expanded="false" aria-controls="navbar"><span class="sr-only">Toggle navigation</span></button> <a
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class="navbar-brand" href="/">sslip.io</a>
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</div>
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<div id="navbar" class="collapse navbar-collapse">
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<ul class="nav navbar-nav">
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<li class="active">
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<a href="/">Home</a>
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</li><!--
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<li><a href="faq.html">FAQ</a></li>
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<li><a href="about.html">About</a></li>
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-->
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</ul>
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</div><!--/.nav-collapse -->
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</div>
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</nav>
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<div class="container">
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<div class="starter-template">
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<h3 id="sslip.io">sslip.io</h3>
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<p>Operational Status: <a href="https://ci.nono.io/teams/main/pipelines/sslip.io"><img
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src="https://ci.nono.io/api/v1/pipelines/sslip.io/jobs/dns-servers/badge" alt="ci.nono.io"></a> <sup><a
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href="#status" class="alert-link">[Status]</a></sup></p>
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<p><em>sslip.io</em> is a DNS (<a href="https://en.wikipedia.org/wiki/Domain_Name_System">Domain Name System</a>)
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service that, when queried with a hostname with an embedded IP address, returns that IP address. It was inspired
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by <a href="http://xip.io">xip.io</a>, which was created by <a href="https://github.com/sstephenson">Sam
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Stephenson</a>.</p>
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<p>This service is dedicated to the late, great <a href="https://asiasamachar.com/2024/05/19/56886/">Roopinder
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Singh</a>, who ran a similar service, <a href="https://nip.io">nip.io</a>.</p>
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<p>Here are some examples:</p>
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<table class="table">
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<thead>
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<tr class="header">
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<th>Hostname / URL</th>
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<th>IP Address</th>
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<th>Notes</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td>
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<a href="https://52.0.56.137.sslip.io">https://52.0.56.137.sslip.io</a>
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</td>
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<td>52.0.56.137</td>
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<td>dot separators, sslip.io website mirror (IPv4)</td>
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</tr>
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<tr class="even">
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<td>
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<a href="https://52-0-56-137.sslip.io">https://52-0-56-137.sslip.io</a>
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</td>
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<td>52.0.56.137</td>
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<td>dash separators, sslip.io website mirror (IPv4)</td>
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</tr>
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<tr class="odd">
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<td>www.192.168.0.1.sslip.io</td>
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<td>192.168.0.1</td>
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<td>subdomain</td>
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</tr>
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<tr class="even">
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<td>www.192-168-0-1.sslip.io</td>
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<td>192.168.0.1</td>
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<td>subdomain + dashes</td>
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</tr>
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<tr class="odd">
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<td>
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<a href="https://www-78-46-204-247.sslip.io">https://www-78-46-204-247.sslip.io</a>
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</td>
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<td>78.46.204.247</td>
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<td>dash prefix, sslip.io website mirror (IPv4)</td>
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</tr>
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<tr class="even">
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<td>--1.sslip.io</td>
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<td>::1</td>
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<td>IPv6 — always use dashes, never dots</td>
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</tr>
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<tr class="odd">
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<td>
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<a href="https://2a01-4f8-c17-b8f--2.sslip.io">https://2a01-4f8-c17-b8f--2.sslip.io</a>
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</td>
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<td>2a01:4f8:c17:b8f::2</td>
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<td>sslip.io website mirror (IPv6)</td>
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</tr>
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</tbody>
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</table>
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<div class="alert alert-success" role="alert">
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<b>Developers: disable indexing of your staging site to avoid being blocked</b> (we block by disabling
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resolution of your sslip.io hostname); disable indexing by either including the <code>X-Robots-Tag:
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noindex</code> in your HTTP headers or include a <code>robots.txt</code> at the root of your website with the
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following contents:<code><br>
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User-agent: *<br>
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Disallow: /</code>
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</div>
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<h3 id="branding">Branding / White Label / Custom Domains</h3>
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<p>sslip.io can be used to brand your own site (you don’t need to use the sslip.io domain). For example, say you
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own the domain “example.com”, and you want your subdomain, “xip.example.com” to have xip.io-style features. To
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accomplish this, set the following three DNS servers as NS records for the subdomain “xip.example.com”</p>
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<div class="alert alert-danger" role="alert">
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<b>2024-11-16</b> <code>ns-aws.sslip.io</code> and <code>ns-azure.sslip.io</code> are deprecated. Please update
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your nameservers to the nameservers below. <code>ns-aws</code> and <code>ns-azure</code>will be shut down on
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<b>2024-12-25</b>.<br>
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<br>
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In October 2024, AWS charged me $113.88 for bandwidth for 1,265.3 GB at $0.09 / GB, and I am loath to spend
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$1,366 on yearly bandwidth when other vendors, such as OVH and Hetzner, are much more reasonable.
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</div>
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<table class="table">
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<thead>
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<tr class="header">
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<th>hostname</th>
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<th>IP address</th>
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<th>Location</th>
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</tr>
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</thead>
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<tbody>
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<tr class="odd">
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<td><code>ns-gce.sslip.io.</code></td>
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<td>104.155.144.4</td>
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<td>USA</td>
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</tr>
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<tr class="even">
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<td><code>ns-hetzner.sslip.io.</code></td>
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<td>5.78.115.44<br>
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2a01:4ff:1f0:c920::</td>
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<td>USA</td>
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</tr>
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<tr class="odd">
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<td><code>ns-ovh.sslip.io.</code></td>
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<td>51.75.53.19<br>
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2001:41d0:602:2313::1</td>
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<td>Poland</td>
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</tr>
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</tbody>
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</table>
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<p>Let’s test it from the command line using <code>dig</code>:</p>
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<pre><code>dig @ns-gce.sslip.io. 169-254-169-254.xip.example.com +short</code></pre>
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<p>Yields, hopefully: <sup><a href="#timeout" class="alert-link">[connection timed out]</a></sup></p>
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<pre><code>169.254.169.254</code></pre>
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<h3 id="server">But I Want My Own DNS Server!</h3>
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<p>If you want to run your own DNS server, it's simple: you can compile from <a
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href="https://github.com/cunnie/sslip.io">source</a> or you can use one of our <a
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href="https://github.com/cunnie/sslip.io/releases">pre-built binaries</a>. In the following example, we
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install & run
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our server within a docker container:</p>
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<pre>
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docker run -it --rm fedora
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curl -L https://github.com/cunnie/sslip.io/releases/download/3.2.5/sslip.io-dns-server-linux-amd64 -o dns-server
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chmod +x dns-server
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./dns-server 2> dns-server.log &
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dnf install -y bind-utils
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dig @localhost 127-0-0-1.sslip.io +short # returns "127.0.0.1"</pre>
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<h3 id="tls">TLS</h3>
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<p>You can acquire TLS certificates for your externally-accessible hosts from certificate authorities (CAs) such
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as Let's Encrypt. The easiest mechanism to acquire a certificate would be to use the <a
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href="https://letsencrypt.org/docs/challenge-types/#http-01-challenge">HTTP-01 challenge</a>. It requires, at
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a
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minimum, a web server running on your machine. The <a href="https://caddyserver.com/">Caddy</a> web server is
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one
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of the most popular examples. For example, if you had a webserver with the IP address 52.0.56.137, you could
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obtain a TLS certificate for "52.0.56.137.sslip.io", or "www.52.0.56.137.sslip.io", or
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"prod.www-52-0-56-137.sslip.io".</p>
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<div class="alert alert-success" role="alert">
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<b>Let's Encrypt Rate Limits</b> If your request for an "sslip.io" certificate is <a
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href="https://letsencrypt.org/docs/rate-limits/">rate-limited</a>, please open a <a
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href="https://github.com/cunnie/sslip.io/issues/new/choose">GitHub issue</a> and we'll request a rate-limit
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increase.
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</div>
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<p>If you have procured a wildcard certificate for your branded / white label / custom sslip.io-style subdomain,
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you may install it on your machines for TLS-verified connections.</p>
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<div class="alert alert-success" data-role="alert">
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<p>When using a TLS wildcard certificate in conjunction with your branded sslip.io style subdomain, you must
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<b>use dashes not dots</b> as separators. For example, if you have the TLS certificate for
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<i>*.xip.example.com</i>, you could browse to https://www-52-0-56-137.xip.example.com/ but not
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https://www.52.0.56.137.xip.example.com/.
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</p>
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</div>
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<p>if you're interested in acquiring a wildcard certificate for your sslip.io domain, e.g.
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"*.52-0-56-137.sslip.io", the procedure is described <a
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href="https://github.com/cunnie/sslip.io/blob/main/docs/wildcard.md">here</a>.</p>
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<h3 id="experimental">Experimental Features</h3>
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<p>Experimental features can change; don't depend on them.</p>
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<h4 id="whatismyip">Determining Your External IP Address via DNS Lookup</h4>
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<p>You can use sslip.io's DNS servers (<code>ns.sslip.io</code>) to determine your public IP address by querying
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the <code>TXT</code> record of <code>ip.sslip.io</code>:</p>
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<pre>
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dig @ns.sslip.io txt ip.sslip.io +short # sample reply "2607:fb90:464:ae1e:ed60:29c:884c:4b52"
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dig @ns.sslip.io txt ip.sslip.io +short -4 # forces IPv4 lookup; sample reply "172.58.35.231"
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dig @ns.sslip.io txt ip.sslip.io +short -6 # forces IPv6 lookup; sample reply "2607:fb90:464:ae1e:ed60:29c:884c:4b52"</pre>
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<div class="alert alert-success" role="alert">
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When querying for your IP address, always <b>include the sslip.io name server</b> (e.g. <i>@ns.sslip.io</i>).
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If omitted, you won't get your IP address; instead, you'll get the IP address of your upstream name server.
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</div>
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<p>This feature was inspired by Google's DNS lookup, i.e. <code>dig txt o-o.myaddr.l.google.com @8.8.8.8
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+short</code>. There are also popular HTTP-based services for determining your public IP address:</p>
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<ul>
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<li>
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<a href="http://icanhazip.com/">icanhazip.com</a> (<a
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href="https://major.io/2021/06/06/a-new-future-for-icanhazip/">backstory</a>)
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</li>
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<li>
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<a href="http://ipify.org/">ipify.org</a>
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</li>
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<li>
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<a href="http://ip4.me/">ip4.me</a>
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</li>
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<li>
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<a href="http://curlmyip.org/">curlmyip.org</a>
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</li>
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<li>
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<a href="http://ifconfig.co/">ifconfig.co</a>
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</li>
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<li>
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<a href="http://ipinfo.io/">ipinfo.io</a> (commercial)
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</li>
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</ul>
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<p>A big advantage of using DNS queries instead of HTTP queries is bandwidth: querying
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<code>ns-azure.sslip.io</code> requires a mere 594 bytes spread over 2 packets; Querying <a
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href="https://icanhazip.com/">https://icanhazip.com/</a> requires 8692 bytes spread out over 34 packets—over
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14 times
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as much! Admittedly bandwidth usage is a bigger concern for the one hosting the service than the one using the
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service.
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</p>
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<h4 id="version">Determining The Server Version of Software</h4>You can determine the server version of the
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sslip.io software by querying the TXT record of <code>version.status.sslip.io</code>:
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<pre>
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dig @ns-gce.nono.io version.status.sslip.io txt +short
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"2.7.0"
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"2023/10/04-18:51:49-0700"
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"8f7f2df"
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</pre>
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<p>The first number, ("2.6.1"), is the version of the sslip.io DNS software, and is most relevant. The other two
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numbers are the date compiled and the most recent git hash, but those values can differ across servers due to
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the
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manner in which the software is deployed.</p>
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<h4 id="metrics">Server Metrics</h4>You can retrieve metrics from a given server by querying the TXT records of
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<code>metrics.status.sslip.io</code>
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<pre>
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dig @ns-azure.sslip.io metrics.status.sslip.io txt +short
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"Uptime: 165655"
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"Blocklist: 2023-10-04 07:37:50-07 3,6"
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"Queries: 14295231 (86.3/s)"
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"TCP/UDP: 5231/14290000"
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"Answer > 0: 4872793 (29.4/s)"
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"A: 4025711"
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"AAAA: 247215"
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"TXT Source: 57"
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"TXT Version: 24"
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"PTR IPv4/IPv6: 318/22"
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"NS DNS-01: 135"
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"Blocked: 175"
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</pre>
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<h5>Explanation of Metrics</h5>
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<dl>
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<dt>Uptime</dt>
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<dd>The time since the DNS server has been started, in seconds</dd>
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<dt>Blocklist</dt>
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<dd>
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The first value ("2023-10-04 07:37:50-07") is the date the blocklist was last downloaded. The following two
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numbers are the number of string matches that are blocked (e.g. "raiffeisen" is a string that is blocked if
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it appears in the queried hostname) and the number of CIDR matches that are blocked (e.g. "43.134.66.67/24"
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is blocked). The blocklist can be found <a
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href="https://github.com/cunnie/sslip.io/blob/main/etc/blocklist.txt">here</a>
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</dd>
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<dt>Queries</dt>
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<dd>This consists of two numbers: The first is the raw number of DNS queries that the server has responded to
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since starting operation, and the second is the first number divided by the uptime (i.e. queries/second)</dd>
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<dt>TCP/UDP</dt>
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<dd>This is the number of queries received on the TCP protocol versus the UDP protocol. The sum should equal
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the number of queries. DNS typically uses the UDP protocol</dd>
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<dt>Answer > 0</dt>
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<dd>This consists of two numbers: the first is the number of queries we responded to with at least one record
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in the answer section, and the second is the first number divided by the uptime (i.e. queries/second). Note
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that the number of responses with an answer record is typically a fourth the size of the overall responses.
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This is normal. One reason for this disparity is that often both the IPv4 (A) and IPv6 (AAAA) records will be
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checked, but only one reply will have a record in the answer section . For example, browsing to
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"127.0.0.1.sslip.io" generates two lookups, one with an answer (IPv4), and one without (IPv6). Another reason
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is that lookups follow a chain, e.g. looking up "127.0.0.1.sslip.io" may generate up to four queries for A
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records ("1.sslip.io", "0.1.sslip.io", "0.0.1.sslip.io" and "127.0.0.1.sslip.io"), only the last of which
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returns a record in the answer section. Pro-tip: if you want to shave milliseconds off name resolution, use
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dashes not dots in your hostname (e.g. "10-9-9-30.sslip.io" instead of "10.9.9.30.sslip.io")</dd>
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<dt>A</dt>
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<dd>The number of responses which included an A (IPv4) record in the answer section since starting operation
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(e.g. "dig 127.0.0.1.sslip.io")</dd>
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<dt>AAAA</dt>
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<dd>The number of responses which included an AAAA (IPv6) record in the answer section since starting operation
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(e.g. "dig --1.sslip.io aaaa")</dd>
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<dt>TXT Source</dt>
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<dd>The number of responses which included a TXT record of the querier's IP address since starting operation
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(e.g. "dig @ns.sslip.io ip.sslip.io txt")</dd>
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<dt>TXT Version</dt>
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<dd>The number of responses which included a TXT record of the DNS's servers version since starting operation
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(e.g. "dig @ns-azure.sslip.io version.status.sslip.io txt")</dd>
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<dt>PTR IPv4/IPv6</dt>
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<dd>This consists of two numbers; the first is the number of responses to IPv4 PTR queries
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(<code>1.0.0.127.in-addr.arpa.</code> → <code>127-0-0-1.sslip.io.</code>), the second, IPv6 PTR queries</dd>
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<dt>NS DNS-01</dt>
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<dd>The number of responses which included a delegation of the NS (name server) to satisfy a certificate
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authority's DNS-01 challenge. This lookup is used for generating wildcard certificates from Let's Encrypt and
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other certificate authority. Technically this is not a "successful" query in that we don't return a record in
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the ANSWER section, but we do return an NS record in the AUTHORITY section. (e.g. "dig @ns-gce.sslip.io
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_acme-challenge.192.168.0.1.sslip.io. soa")</dd>
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</dl>
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<h3 id="related">Related Services</h3>
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<ul>
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<li>
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<a href="http://xip.io/">xip.io</a>: the inspiration for sslip.io. Sadly, this appears to be no longer
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maintained after <a href="https://twitter.com/sstephenson/status/1388146129284603906">Sam Stephenson left
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Basecamp</a>.
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</li>
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<li>
|
||
<a href="http://nip.io">nip.io</a>: similar to xip.io, but the PowerDNS backend is written in elegant Python
|
||
</li>
|
||
<li>
|
||
<a href="https://letsencrypt.org/">Let's Encrypt</a>: A Certificate Authority providing TLS certificates;
|
||
they have never failed to increase our rate limits when asked. If you can, <a
|
||
href="https://www.abetterinternet.org/donate/">donate</a>.
|
||
</li>
|
||
</ul>
|
||
<hr>
|
||
<h4 id="footnotes">Footnotes</h4>
|
||
<p><a id="status"><sup>[Status]</sup></a> A status of “build failing” rarely means the system is failing. It’s
|
||
more often an indication that when the servers were last checked (currently every six hours), the CI (continuous
|
||
integration) <a href="https://ci.nono.io/teams/main/pipelines/sslip.io">server</a> had difficulty reaching one
|
||
of the three sslip.io name servers. That’s normal. <sup><a href="#timeout" class="alert-link">[connection timed
|
||
out]</a></sup></p>
|
||
<p><a id="timeout"><sup>[connection timed out]</sup></a></p>
|
||
<p>DNS runs over <a href="https://en.wikipedia.org/wiki/User_Datagram_Protocol">UDP</a> which has no guaranteed
|
||
delivery, and it’s not uncommon for the packets to get lost in transmission. DNS clients are programmed to
|
||
seamlessly query a different server when that happens. That’s why DNS, by fiat, requires at least two name
|
||
servers (for redundancy). From <a href="https://tools.ietf.org/html/rfc1034">IETF (Internet Engineering Task
|
||
Force) RFC (Request for Comment) 1034</a>:</p>
|
||
<blockquote>
|
||
<p>A given zone will be available from several name servers to insure its availability in spite of host or
|
||
communication link failure. By administrative fiat, we require every zone to be available on at least two
|
||
servers, and many zones have more redundancy than that.</p>
|
||
</blockquote>
|
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