mirror of
https://github.com/moparisthebest/xeps
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133 lines
4.7 KiB
XML
133 lines
4.7 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>Server IP Check</title>
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<abstract>This specification defines a simple XMPP extension that enables a client to discover its external IP address.</abstract>
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&LEGALNOTICE;
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<number>xxxx</number>
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<status>ProtoXEP</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>sic</shortname>
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&stpeter;
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<revision>
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<version>0.0.2</version>
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<date>2009-03-10</date>
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<initials>psa</initials>
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<remark><p>Removed client inclusion of its IP address; added IPv6 example.</p></remark>
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</revision>
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<revision>
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<version>0.0.1</version>
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<date>2009-03-10</date>
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<initials>psa</initials>
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<remark><p>First draft.</p></remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>There are times when a client might want or need to discover what its external Internet Protocol (IP) address is, e.g. when gathering transport candidates for &xep0065; or &xep0176;. One way to do so is for the client to ask the XMPP server to which it has connected. This simple specification defines such a method.</p>
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</section1>
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<section1 topic='Protocol' anchor='proto'>
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<p>First the client sends an IQ-get request to its server.</p>
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<example caption="Client requests its IP address from the server"><![CDATA[
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<iq from='romeo@montague.lit/orchard'
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id='ik2s7159'
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type='get'>
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<ip xmlns='urn:xmpp:sic:0'/>
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</iq>
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]]></example>
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<p>The server then returns an IQ-result containing an <ip/> element whose XML character data specifies the client's IP address according to the server.</p>
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<example caption="Server returns IP address"><![CDATA[
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<iq id='ik2s7159'
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to='romeo@montague.lit/orchard'
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type='result'>
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<ip xmlns='urn:xmpp:sic:0'>192.168.4.1</ip>
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</iq>
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]]></example>
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<p>The IP address could be IPv4 or IPv6.</p>
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<example caption="Server returns IPv6 address"><![CDATA[
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<iq id='ik2s7159'
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to='romeo@montague.lit/orchard'
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type='result'>
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<ip xmlns='urn:xmpp:sic:0'>2001:db8::9:1</ip>
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</iq>
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]]></example>
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</section1>
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<section1 topic='Determining Support' anchor='support'>
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<p>If an entity supports this protocol, it MUST report that by including a service discovery feature of "urn:xmpp:sic:0" in response to disco#info requests &NSNOTE;.</p>
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<example caption="Service discovery information request"><![CDATA[
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<iq from='romeo@montague.lit/orchard'
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id='ux71f395'
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to='montague.lit'
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type='get'>
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<query xmlns='http://jabber.org/protocol/disco#info'/>
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</iq>
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]]></example>
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<example caption="Service discovery information response"><![CDATA[
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<iq from='montague.lit'
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id='ux71f395'
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to='romeo@montague.lit/orchard'
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type='result'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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<feature var='urn:xmpp:sic:0'/>
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</query>
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</iq>
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]]></example>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>&rfc3920; specifies that client IP addresses shall not be made public. If a client requests its own IP address, that policy is not violated. However, a server MUST NOT return the IP address of another client (e.g., if a connected client sends a SIC request to the bare JID of another user); instead, it MUST return a &forbidden; error.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>This document requires no interaction with &IANA;.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<section2 topic='Protocol Namespaces' anchor='registrar-ns'>
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<p>This specification defines the following XML namespace:</p>
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<ul>
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<li>urn:xmpp:sic:0</li>
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</ul>
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<p>Upon advancement of this specification from a status of Experimental to a status of Draft, the ®ISTRAR; shall add the foregoing namespace to the registry located at &NAMESPACES;, as described in Section 4 of &xep0053;.</p>
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</section2>
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<section2 topic='Protocol Versioning' anchor='registrar-versioning'>
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&NSVER;
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</section2>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<code><![CDATA[
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<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='urn:xmpp:sic:0'
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xmlns='urn:xmpp:sic:0'
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elementFormDefault='qualified'>
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<xs:element name='ip' type='xs:string'/>
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</xs:schema>
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]]></code>
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</section1>
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<section1 topic='Acknowledgements' anchor='acks'>
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<p>Thanks to Thiago Camargo and Diana Cionoiu for their prodding to define this extension.</p>
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</section1>
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</xep>
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