One document matched: draft-thomson-geopriv-held-beep-01.txt
Differences from draft-thomson-geopriv-held-beep-00.txt
GEOPRIV M. Thomson
Internet-Draft J. Winterbottom
Intended status: Standards Track Andrew
Expires: May 22, 2008 November 19, 2007
A BEEP Binding for the HELD Protocol
draft-thomson-geopriv-held-beep-01.txt
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Copyright Notice
Copyright (C) The IETF Trust (2007).
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Abstract
A BEEP binding is described for HELD. This binding is more suitable
than the basic HTTP binding in scenarios where multiple messages are
sent between the same two parties.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. The HELD BEEP Profile . . . . . . . . . . . . . . . . . . . . 4
2.1. Channel Initialization . . . . . . . . . . . . . . . . . . 4
2.2. Message Exchange Pattern . . . . . . . . . . . . . . . . . 4
2.3. Error Handling . . . . . . . . . . . . . . . . . . . . . . 5
3. The "held+beep:" URI . . . . . . . . . . . . . . . . . . . . . 6
3.1. Location By-Reference and the BEEP Binding . . . . . . . . 6
4. LIS Discovery and Authentication for BEEP . . . . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
6.1. BEEP Profile Registration . . . . . . . . . . . . . . . . 9
6.2. URN sun-namespace registration for
'urn:ietf:params:xml:ns:geopriv:held:beep' . . . . . . . . 9
6.3. Registration of the "held+beep:" URI Scheme . . . . . . . 10
6.4. Registration of a LIS Application Protocol Tag for
HELD over BEEP . . . . . . . . . . . . . . . . . . . . . . 11
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Normative References . . . . . . . . . . . . . . . . . . . 12
7.2. Informative References . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 14
Intellectual Property and Copyright Statements . . . . . . . . . . 15
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1. Introduction
The HTTP binding for HELD [I-D.ietf-geopriv-http-location-delivery]
provides a basis for the protocol, which does not encumber
implementations with a complex protocol stack. However, some
applications require that a requester make multiple requests in
parallel to a Location Information Server (LIS).
[I-D.winterbottom-geopriv-lis2lis-req] and
[I-D.winterbottom-geopriv-held-lis2lis-bcp] describe use cases and an
application of HELD where HTTP is suboptimal.
The HTTP binding is not suitable in volume scenarios because HTTP
suffers from head-of-queue blocking. This prevents multiple requests
from being processed in parallel. In order to achieve higher
throughput, the requester must establish multiple TCP connections in
parallel. This causes HTTP to be unsuitable for applications where
multiple parallel requests are expected by increasing the overheads.
BEEP [RFC3080] provides a framing scheme that allows for parallel
requests. BEEP uses MIME [RFC2045] for its messages, which means
that no significant modifications are required to carry HELD
messages. This document describes a BEEP profile for HELD.
1.1. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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2. The HELD BEEP Profile
The BEEP profile for HELD is identified as:
urn:ietf:params:xml:ns:geopriv:held:beep
This identifier is used in the BEEP "profile" element during channel
creation.
The HELD channel is a simple continuous channel that does not require
any state information. Requests and their respective responses are
always in the request-response form ("MSG"/"RPY").
2.1. Channel Initialization
The HELD profile is started with a single "profile" request. No
additional parameters are required. When initiating a channel the
"profile" element MUST be empty, as shown in the example below.
<start number="1" serverName="lis.example.com">
<profile uri="urn:ietf:params:xml:ns:geopriv:held:beep"/>
</start>
The "serverName" attribute on the "start" message serves the same
purpose as the HTTP [RFC2616] "Host" header in informing the server
of the name it is known by.
Similarly, the response to channel initialization MUST be empty.
<profile uri="urn:ietf:params:xml:ns:geopriv:held:beep"/>
2.2. Message Exchange Pattern
The BEEP binding for HELD requires only the "MSG"/"RPY" message
exchange. Each "MSG" frame contains a request, which may be either a
"locationRequest", "createContext" or "updateContext". Each "RPY"
frame includes a response, either a PIDF-LO (i.e. "presence"), or a
"contextResponse".
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The following exchange demonstrates how a simple HELD location
request and response are encapsulated. The "C:" and "S:" prefixes on
lines are used following the convention in [RFC3080].
C: MSG 1 7 . 544 125
C: Content-Type: application/held+xml
C:
C: <?xml version="1.0"?>
C: <locationRequest xmlns="urn:ietf:params:xml:ns:geopriv:held"/>
C: END
S: RPY 1 7 . 1902 695
S: Content-Type: application/held+xml
S:
S: <?xml version="1.0"?>
S: <locationResponse xmlns="urn:ietf:params:xml:ns:geopriv:held">
S: <!-- PIDF-LO contents not shown -->
S: </locationResponse>
S: END
2.3. Error Handling
The HELD BEEP binding does not use the BEEP "ERR" message to indicate
errors at the HELD protocol level. Errors in handling HELD Requests
are indicated to the requester in a "RPY" message.
Errors in the BEEP message that are unrelated to the HELD protocol,
such as MIME formatting problems, are indicated using the BEEP "ERR"
message.
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3. The "held+beep:" URI
A new URI form is defined to describe a BEEP binding instance. The
"held+beep:" URI includes server, port and an identifier that can be
used to construct a location reference. The "held+beep:" URI is
constructed as shown in Figure 4 using ABNF [RFC4234] and the
definitions for URI components from [RFC3986].
; all undefined items are specified in RFC 3986
HB-URI = "held+beep" ":" hier-part [ "?" query ]
hier-part = "//" authority path-abempty / path-absolute
/ path-rootless / path-empty
authority = host ":" port
Figure 4: The "held+beep:" URI
There is no well-known port for this binding; therefore, the port
component of the URI MUST be included.
3.1. Location By-Reference and the BEEP Binding
The "path" and "query" components of the "held+beep:" URI are used in
a similar fashion to the analagous components in HTTP/1.1 [RFC2616].
These components can be conveyed for each request by including them
in the MIME headers for each request.
The "Request-URI" header includes an absolute path and optional query
components. The header is shown in Figure 5, using ABNF [RFC4234].
Request-URI-Header = "Request-URI" ":" Request-URI
; Request-URI from RFC 2616
Figure 5: The Request-URI Header
This header is modelled on the "Request-URI" field in HTTP/1.1
[RFC2616] and it follows the same rules. See Section 5.1.2 of
[RFC2616] for details on how to use this header. A value of "*"
implies that no location URI is being used, this value should be
assumed when the header is omitted. A value of "*" is assumed if a
"held+beep:" URI does not contain path or query elements.
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4. LIS Discovery and Authentication for BEEP
This profile is most suited to situations where a client and LIS
exchange a large number of requests over a prolonged period. It is
anticipated that the client and LIS are known to each other.
Based on this assumption, it is reasonable for the LIS and its
clients to have pre-existing configuration that makes discovery
unnecessary. In addition, authentication details and methods can be
pre-configured on both nodes. This section outlines how discovery
can be performed for a LIS that supports the BEEP binding.
Regardless of the method used to determine the address of the LIS, a
client MUST authenticate the LIS. This prevents any LIS spoofing
attacks that could be used to acquire information about the client
(and in turn, their clients).
For persistent connections, it is RECOMMENDED that the LIS also
authenticate clients. Some authorization decision is likely to be
necessary in order for a client to initiate a large volume of
requests, which could represent significant load on a LIS.
This document does not mandate any specific authentication method;
however, since TLS MUST be implemented, the mandatory methods in
[RFC4346] are assumed to be present. Alternative authentication
methods can be negotiated between the LIS and its clients.
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5. Security Considerations
TLS [RFC4346] SHOULD be used for HELD over BEEP unless
confidentiality, message integrity and authentication are assured
through other means (e.g. dedicated media). It is RECOMMENDED that
BEEP peers establish a TLS connection immediately, rather than
relying on the TLS tuning profile in BEEP.
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6. IANA Considerations
6.1. BEEP Profile Registration
This section outlines the HELD BEEP binding in the form described in
[RFC3080].
Profile Identification: urn:ietf:params:xml:ns:geopriv:held:beep
Messages exchanged during Channel Creation: none
Messages starting one-to-one exchanges: HELD request messages from
[I-D.ietf-geopriv-http-location-delivery] and extension documents.
Messages in positive replies: HELD request messages from
[I-D.ietf-geopriv-http-location-delivery] and extension documents.
Messages in negative replies: The HELD "error" message
Messages in one-to-many exchanges: none
Message Syntax: c.f., HELD [I-D.ietf-geopriv-http-location-delivery]
Message Semantics: c.f., HELD
[I-D.ietf-geopriv-http-location-delivery]
Contact Information: c.f., the "Author's Address" section of this
document
6.2. URN sun-namespace registration for
'urn:ietf:params:xml:ns:geopriv:held:beep'
This section registers a new XML namespace,
"urn:ietf:params:xml:ns:geopriv:held:beep", as per the guidelines in
[RFC3688].
URI: urn:ietf:params:xml:ns:geopriv:held:beep
Registrant Contact: IETF, GEOPRIV working group,
(geopriv@ietf.org), Martin Thomson (martin.thomson@andrew.com).
XML:
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BEGIN
<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<title>HELD BEEP Binding</title>
</head>
<body>
<h1>Namespace for HELD BEEP Binding Profile</h1>
<h2>urn:ietf:params:xml:ns:geopriv:held:beep</h2>
[[NOTE TO IANA/RFC-EDITOR: Please update RFC URL and replace XXXX
with the RFC number for this specification.]]
<p>See <a href="[[RFC URL]]">RFCXXXX</a>.</p>
</body>
</html>
END
6.3. Registration of the "held+beep:" URI Scheme
This section registers the "held+beep:" URI scheme with the IANA,
following the guidelines in [RFC4395].
URI scheme name: held+beep
Status: permanent
URI scheme syntax: See Figure 4 in Section 3.
URI scheme semantics: A held+beep URI defines a means of accessing a
LIS, or it can be used to convey a location URI, see Section 3.
Encoding considerations: A held+beep URI is not designed to include
internationalized text, it is created and consumed by automated
processes only. Internationalized domain names [RFC3490] can be
included in the authority part of the URI, but path components are
not intended for user entry.
Applications/protocols that use this URI scheme name: The held+beep
URI is used by Location Information Servers (LIS) as a means of
describing a service, or as a location reference.
Interoperability considerations: No specific considerations.
Security considerations: No specific considerations.
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Contact: IETF, GEOPRIV working group, (geopriv@ietf.org), Martin
Thomson (martin.thomson@andrew.com).
References: RFCXXXX (this document), RFCXXXX (HELD)
6.4. Registration of a LIS Application Protocol Tag for HELD over BEEP
This section registers a new S-NAPTR Application Protocol tag for the
BEEP binding of the HELD [I-D.ietf-geopriv-http-location-delivery]
protocol, as mandated by [RFC3958].
Application Service Tag: HELD+BEEP
Intended Usage: Identifies the HELD protocol over BEEP
Applicable Service Tag(s): LIS
Terminal NAPTR Record Type(s): S
Defining Publication: RFCXXXX
Related Publications: HELD [I-D.ietf-geopriv-http-location-delivery]
Contact Information: The authors of this document
Author/Change Controller: The IESG
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7. References
7.1. Normative References
[RFC2045] Freed, N. and N. Borenstein, "Multipurpose Internet Mail
Extensions (MIME) Part One: Format of Internet Message
Bodies", RFC 2045, November 1996.
[RFC3080] Rose, M., "The Blocks Extensible Exchange Protocol Core",
RFC 3080, March 2001.
[RFC3958] Daigle, L. and A. Newton, "Domain-Based Application
Service Location Using SRV RRs and the Dynamic Delegation
Discovery Service (DDDS)", RFC 3958, January 2005.
[RFC4346] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.1", RFC 4346, April 2006.
[I-D.ietf-geopriv-http-location-delivery]
Barnes, M., Winterbottom, J., Thomson, M., and B. Stark,
"HTTP Enabled Location Delivery (HELD)",
draft-ietf-geopriv-http-location-delivery-03 (work in
progress), November 2007.
[RFC4234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005.
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, January 2005.
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
7.2. Informative References
[RFC3490] Faltstrom, P., Hoffman, P., and A. Costello,
"Internationalizing Domain Names in Applications (IDNA)",
RFC 3490, March 2003.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
January 2004.
[RFC4395] Hansen, T., Hardie, T., and L. Masinter, "Guidelines and
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Registration Procedures for New URI Schemes", BCP 115,
RFC 4395, February 2006.
[I-D.winterbottom-geopriv-lis2lis-req]
Winterbottom, J. and S. Norreys, "LIS to LIS Protocol
Requirements", draft-winterbottom-geopriv-lis2lis-req-00
(work in progress), June 2007.
[I-D.winterbottom-geopriv-held-lis2lis-bcp]
Winterbottom, J. and M. Thomson, "Using HELD for Inter-LIS
Communication",
draft-winterbottom-geopriv-held-lis2lis-bcp-00 (work in
progress), November 2007.
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Authors' Addresses
Martin Thomson
Andrew
PO Box U40
Wollongong University Campus, NSW 2500
AU
Phone: +61 2 4221 2915
Email: martin.thomson@andrew.com
URI: http://www.andrew.com/
James Winterbottom
Andrew
PO Box U40
Wollongong University Campus, NSW 2500
AU
Phone: +61 2 4221 2938
Email: james.winterbottom@andrew.com
URI: http://www.andrew.com/
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