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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2014-12-10 03:05:47 +0000 |
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| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2014-12-10 03:05:47 +0000 |
| commit | 416ef5e2bf59bb2e45066a1d5d91ac677c0f48e5 (patch) | |
| tree | 1c746d673dcec7a8488c6ac51db8245411034376 /doc/s6-dnsq.html | |
| download | s6-dns-416ef5e2bf59bb2e45066a1d5d91ac677c0f48e5.tar.xz | |
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| -rw-r--r-- | doc/s6-dnsq.html | 82 |
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diff --git a/doc/s6-dnsq.html b/doc/s6-dnsq.html new file mode 100644 index 0000000..9a22602 --- /dev/null +++ b/doc/s6-dnsq.html @@ -0,0 +1,82 @@ +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> + <meta http-equiv="Content-Language" content="en" /> + <title>s6-dns: the s6-dnsq program</title> + <meta name="Description" content="s6-dns: the s6-dnsq program" /> + <meta name="Keywords" content="s6-dns client s6-dnsq dnsq analysis debug" /> + <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> + </head> +<body> + +<p> +<a href="index.html">s6-dns</a><br /> +<a href="http://skarnet.org/software/">Software</a><br /> +<a href="http://skarnet.org/">skarnet.org</a> +</p> + +<h1> The s6-dnsq program </h1> + +<p> + s6-dnsq is an analysis and debug tool. It performs a non-recursive DNS query +to a given list of servers, +then prints the contents of the answer packet, and optionally debug +information during the resolution. +</p> + +<h2> Interface </h2> + +<pre> + s6-dnsq [ -1 | -2 ] [ -t <em>timeout</em> ] [ -D <em>level</em> ] <em>qtype</em> <em>domain</em> <em>serverlist</em> +</pre> + +<ul> + <li> s6-dnsq makes an iterative DNS query of type <em>qtype</em> for the name <em>domain</em> +to <em>serverlist</em>. +It prints the answer packet, in human-readable form, to its standard output, +then exits 0. </li> + <li> It does not qualify <em>domain</em>. </li> + <li> If the resolution fails for some reason, s6-dnsq exits 2. </li> + <li> <em>serverlist</em> is a list of IP addresses (v4 or v6), one or more addresses +per argument on the command line (so you can use, for instance, +<tt>`s6-dnsip4 ns.example.com`</tt> as argument, and get all the addresses for +<tt>ns.example.com</tt> in your server list). +Servers are tried in the order given, until a definitive +answer is obtained or s6-dnsq runs out of server addresses. </li> +</ul> + +<h2> Options </h2> + +<ul> + <li> <tt>-1</tt> : send debug information to stdout. </li> + <li> <tt>-2</tt> : send debug information to stderr. This is the default. Note that +those options only apply to debug output, not to the regular packet dump, which +is always printed to stdout. </li> + <li> <tt>-t</tt> <em>timeout</em> : if the resolution takes more +than <em>timeout</em> milliseconds, then it exits 99 right away with an error +message. By default, <em>timeout</em> is 0, which means no timeout. </li> + <li> <tt>-D</tt> <em>level</em> : produce debug output during +resolution. If <em>level</em> is: + <ul> + <li> 0: no debug output is produced </li> + <li> 1: information is printed when s6-dnsq receives a DNS packet from a server </li> + <li> 2: information is printed before and after s6-dnsq sends a DNS packet to a server </li> + <li> 3: both 1. and 2. apply </li> + </ul> +</ul> + +<h2> Notes </h2> + +<ul> + <li> TXT records are printed in a quoted form similar to +<a href="http://skarnet.org/software/s6-portable-utils/s6-quote.html">s6-quote</a>'s +output. </li> + <li> If s6-dnsq finds a record it cannot print, such as an unknown RR type, +it dumps its contents in the same quoted form. </li> + <li> The normal output format should be stable, so you can write programs that +automatically parse it. However, the debug output format is undocumented and subject +to change. </li> +</ul> + +</body> +</html> |