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SOAP-over-UDP Version 1.1

Committee Specification 01

14 May 2009

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Technical Committee:

OASIS Web Services Discovery and Web Services Devices Profile (WS-DD) TC

Chair(s):

Toby Nixon, Microsoft Corporation

Alain Regnier, Ricoh Company Limited

Editor(s):

Ram Jeyaraman, Microsoft Corporation

Declared XML Namespace(s):

None.

Abstract:

This specification defines a binding for SOAP envelopes to use datagrams.

Status:

This document was last revised or approved by the WS-DD TC on the above date. The level of approval is also listed above. Check the “Latest Version” or “Latest Approved Version” location noted above for possible later revisions of this document.

Technical Committee members should send comments on this specification to the Technical Committee’s email list. Others should send comments to the Technical Committee by using the “Send A Comment” button on the Technical Committee’s web page at http://www.oasis-open.org/committees/ws-dd/.

For information on whether any patents have been disclosed that may be essential to implementing this specification, and any offers of patent licensing terms, please refer to the Intellectual Property Rights section of the Technical Committee web page (http://www.oasis-open.org/committees/ws-dd/ipr.php).

The non-normative errata page for this specification is located at http://www.oasis-open.org/committees/ws-dd/.

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Table of Contents

1        Introduction. 4

1.1 Requirements. 4

1.2 Terminology. 4

1.2.1 Notational Conventions. 4

1.2.2 Terms and Definitions. 5

1.3 XML Namespaces. 5

1.4 Relationship to Web Service Specifications. 5

1.5 Normative References. 5

2        UDP Packet 7

2.1 Source Address and Port 7

2.2 Data Octets. 7

3        Message Patterns. 8

3.1 One-way. 8

3.1.1 One-way Example. 8

3.2 Request-response. 8

3.2.1 Anonymous [reply endpoint] 8

3.2.2 Request Example 1. 9

3.2.3 Response Example 1. 9

3.2.4 Request Example 2. 9

3.2.5 Response Example 2. 10

3.3 Multicast 10

3.4 Retransmission. 11

4        Message Encoding. 12

5        URI Scheme. 13

5.1 Syntax. 13

5.2 Semantics. 13

6        Security Considerations. 14

7        Conformance. 15

Appendix A.       Example retransmission algorithm (non-normative) 16

Appendix B.       Example duplicate detection mechanisms (non-normative) 17

Appendix C.       Acknowledgements. 18

Appendix D.       Revision History. 20

 


1      Introduction

Many application protocol patterns match the semantics of the User Datagram Protocol (UDP) [RFC 768]. Some do not require the delivery guarantees of TCP while others make use of multicast transmission. In order to allow Web services to support these patterns, we need a way to map SOAP envelopes to user datagrams. This support is essential for services using WS-Discovery, where the use of multicast and need for low connection overhead makes UDP a natural choice. It is anticipated that other protocols will have similar requirements. This specification defines a binding of SOAP to user datagrams, including message patterns, addressing requirements, and security considerations.

1.1 Requirements

This specification intends to meet the following requirements:

·         Support a one-way message-exchange pattern (MEP) where a SOAP envelope is carried in a user datagram.

·         Support a request-response message-exchange pattern (MEP) where SOAP envelopes are carried in user datagrams.

·         Support multicast transmission of SOAP envelopes carried in user datagrams.

Support both SOAP 1.1 [SOAP 1.1] and SOAP 1.2 [SOAP 1.2 Part 1] Envelopes.

1.2 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 [RFC 2119].

1.2.1 Notational Conventions

This specification uses the following syntax to define normative outlines for messages:

The syntax appears as an XML instance, but values in italics indicate data types instead of literal values.

Characters are appended to elements and attributes to indicate cardinality:

·         "?" (0 or 1)

·         "*" (0 or more)

·         "+" (1 or more)

·         The character "|" is used to indicate a choice between alternatives.

·         The characters "[" and "]" are used to indicate that contained items are to be treated as a group with respect to cardinality or choice.

·         Ellipses (i.e., "...") indicate points of extensibility. Additional children and/or attributes MAY be added at the indicated extension points but MUST NOT contradict the semantics of the parent and/or owner, respectively. If a receiver does not recognize an extension, the receiver SHOULD ignore the extension.

·         XML namespace prefixes (see Table 1) are used to indicate the namespace of the element being defined.

Elsewhere in this specification, the characters "[" and "]" are used to call out references and property names. This specification uses the [action] and Fault properties [WS-Addressing] to define faults.

1.2.2 Terms and Definitions

Defined below are the basic definitions for the terms used in this specification.

Receiver

The endpoint terminating a SOAP/UDP datagram

Sender

The endpoint originating a SOAP/UDP datagram

SOAP/UDP datagram

A user datagram containing a SOAP envelope in the data octets

User datagram

A User Datagram Protocol (UDP) packet

1.3 XML Namespaces

The following lists XML namespaces that are used in this specification. The choice of any namespace prefix is arbitrary and not semantically significant.

Table 1. Prefix and XML namespaces used in this specification

Prefix

XML Namespace

Specification(s)

s

(Either SOAP 1.1 or 1.2)

(Either SOAP 1.1 or 1.2)

s11

http://schemas.xmlsoap.org/soap/envelope/

[SOAP 1.1]

s12

http://www.w3.org/2003/05/soap-envelope

[SOAP 1.2 Part 1]

a

http://www.w3.org/2005/08/addressing

[WS-Addressing]

1.4 Relationship to Web Service Specifications

This specification provides a binding appropriate for:

·         SOAP 1.1 [SOAP 1.1]

·         SOAP 1.2 [SOAP 1.2 Part 1]

Messages conforming to either SOAP specification can use this binding. This specification relies on WS-Addressing [WS-Addressing].

1.5 Normative References

[RFC 768]

J. Postel, "User Datagram Protocol," RFC 768, http://www.ietf.org/rfc/rfc768.txt, August 1980.

[RFC 2119]

S. Bradner, "Key words for use in RFCs to Indicate Requirement Levels," RFC 2119, http://www.ietf.org/rfc/rfc2119.txt, March 1997.

[RFC 2365]

D. Meyer, "Administratively Scoped IP Multicast," RFC 2365, http://www.ietf.org/rfc/rfc2365.txt, July 1998.

[RFC 3986]

T. Berners-Lee, et al, "Uniform Resource Identifiers (URI): Generic Syntax", IETF RFC 3986, http://www.ietf.org/rfc/rfc3986.txt, January 2005.

[RFC 791]

“Internet Protocol (IPv4)”, IETF RFC 791, http://www.ietf.org/rfc/rfc791.txt, September 1981.

[RFC 2460]

S. Deering, et al, “Internet Protocol, Version 6 (IPv6) Specification”, IETF RFC 2460, http://www.ietf.org/rfc/rfc2460.txt, December 1998.

[SOAP 1.1]

W3C Note, "Simple Object Access Protocol (SOAP) 1.1", http://www.w3.org/TR/2000/NOTE-SOAP-20000508, 08 May 2000.

[SOAP 1.2 Part 1]

W3C Recommendation, "SOAP Version 1.2 Part 1: Messaging Framework (Second Edition)", http://www.w3.org/TR/2007/REC-soap12-part1-20070427, April 2007.

[WS-Addressing]

W3C Recommendation, "Web Services Addressing 1.0 - Core", http://www.w3.org/TR/2006/REC-ws-addr-core-20060509, 9 May 2006.

[WS-Security]

OASIS Standard, "Web Services Security Core specification 1.1", http://www.oasis-open.org/committees/download.php/16790/wss-v1.1-spec-os-SOAPMessageSecurity.pdf, February 2006.

[XML 1.0]

W3C Recommendation, "Extensible Markup Language (XML) 1.0 (Fourth Edition)", http://www.w3.org/TR/2006/REC-xml-20060816, 16 August 2006.

2      UDP Packet

Except as noted explicitly below, this specification does not constrain RFC 768 [RFC 768].

2.1 Source Address and Port

For security reasons, the source address MUST be supplied at the IP packet level and MUST be the IPv4 [RFC 791] address (including but not limited to unicast, multicast, and broadcast addresses) or IPv6 [RFC 2460] address (including but not limited to unicast and multicast addresses) of the sender; the receiver SHOULD reject IP packets containing a SOAP/UDP datagram that have inappropriate values for the source address.

2.2 Data Octets

The data octets MUST contain a SOAP envelope [SOAP 1.1] [SOAP 1.2 Part 1]. The SOAP envelope MUST fit within a single datagram, that is, it MUST be small enough that the overall datagram is less than 65,536 (2^16) octets.

The SOAP envelope MUST use the mechanisms defined in WS-Addressing [WS-Addressing].

3      Message Patterns

This specification supports the following message patterns:

·         Unicast one-way

·         Multicast one-way

·         Unicast request, unicast response

·         Multicast request, unicast response

as detailed in the rest of this section.

This specification uses the constructs [action], [destination], [message id], [reply endpoint], [address] in WS-Addressing [WS-Addressing]. SOAP messages transmitted over UDP MUST have a [message id] property.

3.1 One-way

The one-way message is sent in a user datagram.

3.1.1 One-way Example

(01) <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope"

(02)             xmlns:a="http://www.w3.org/2005/08/addressing">

(03)   <s:Header>

(04)     <a:To>http://fabrikam.com/Server</a:To>

(05)     <a:Action>http://fabrikam.com/Probe</a:Action>

(06)     <a:MessageID>

(07)       urn:uuid:1da72f1a-5546-493c-934c-a9e3577e206a

(08)     </a:MessageID>

(09)   </s:Header>

(10)   <s:Body>

(11)     ...

(12)   </s:Body>

(13) </s:Envelope>

This example shows a one-way SOAP message. Lines 01-03 are standard SOAP elements. Lines 04-08 specify various WS-Addressing headers. Note that despite the fact that the [destination] for the message is specified using a URI that uses the http scheme, the message is still transmitted over UDP. Lines 09-13 show standard SOAP elements.

3.2 Request-response

The request message is sent in one user datagram and the corresponding response message is sent in another user datagram.

3.2.1 Anonymous [reply endpoint]

WS-Addressing defines a URI, "http://www.w3.org/2005/08/addressing/anonymous", that can appear in the [address] property of an endpoint reference. If the [reply endpoint] property of a SOAP message transmitted over UDP has an [address] property with this value, the UDP source address (and source port) is considered to be the address to which reply messages should be sent.

The implied value of the [reply endpoint] property for SOAP messages transmitted over UDP is an endpoint reference with an [address] property whose value is "http://www.w3.org/2005/08/addressing/anonymous".

3.2.2 Request Example 1

(01) <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope"

(02)             xmlns:a="http://www.w3.org/2005/08/addressing">

(03) <s:Header>

(04)   <a:To>http://fabrikam.com/Server</a:To>

(05)   <a:Action>http://fabrikam.com/Probe</a:Action>

(06)   <a:MessageID>

(07)     urn:uuid:9ceada16-2403-4404-a8cc-60799acd9d1c

(08)   </a:MessageID>

(09)   <a:ReplyTo>

(10)     <a:Address>

(11)       http://www.w3.org/2005/08/addressing/anonymous

(12)     </a:Address>

(13)   </a:ReplyTo>

(14) </s:Header>

(15) <s:Body>

(16)   ...

(17) </s:Body>

(18) </s:Envelope>

This example shows a request SOAP message. Lines 01-03 are standard SOAP elements. Lines 04-13 specify various WS-Addressing headers. Note that despite the fact that the [destination] for the message is specified using a URI that uses the http scheme, the message is still transmitted over UDP. Line 09 shows a [reply endpoint] header specifying the anonymous URI (see Section 3.2.1). Lines 14-18 show standard SOAP elements.

3.2.3 Response Example 1

(01) <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope"

(02)             xmlns:a="http://www.w3.org/2005/08/addressing">

(03)   <s:Header>

(04)     <a:To>

(05)       http://www.w3.org/2005/08/addressing/anonymous

(06)     </a:To>

(07)      <a:Action>http://fabrikam.com/ProbeMatch</a:Action>

(08)      <a:MessageID>

(09)       urn:uuid:5a6ed11a-7a80-409a-82bf-43c4c5092911

(10)     </a:MessageID>

(11)      <a:RelatesTo>

(12)       urn:uuid:9ceada16-2403-4404-a8cc-60799acd9d1c

(13)     </a:RelatesTo>

(14)   </s:Header>

(15)   <s:Body>

(16)     ...

(17)   </s:Body>

(18) </s:Envelope>

This example shows a response SOAP message. Lines 01-03 are standard SOAP elements. Lines 04-13 specify various WS-Addressing headers. Note that the [destination] for the message is specified as the anonymous URI. Line 11 shows a [relationship] header indicating that this message is a reply to the example message in Section 3.2.2. Lines 14-18 show standard SOAP elements.

3.2.4 Request Example 2

(01) <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope"

(02)             xmlns:a="http://www.w3.org/2005/08/addressing" >

(03)   <s:Header>

(04)     <a:To>soap.udp://fabrikam1.com:54321/Server</a:To>

(05)     <a:Action>http://fabrikam1.com/Probe</a:Action>

(06)     <a:MessageID>

(07)       urn:uuid:9ceada16-2403-4404-a8cc-60799acd9d1c

(08)     </a:MessageID>

(09)     <a:ReplyTo>

(10)       <a:Address>

(11)         soap.udp://fabrikam2.com:54322/Client

(12)       </a:Address>

(13)     </a:ReplyTo>

(14)   </s:Header>

(15)   <s:Body>

(16)     ...

(17)   </s:Body>

(18) </s:Envelope>

This example shows a request SOAP message. Lines 01-03 are standard SOAP elements. Lines 04-13 specify various WS-Addressing headers. Note that the [destination] for the message is specified using a URI that uses the soap.udp scheme. Line 09 shows a [reply endpoint] header containing an addressable URI that uses the soap.udp scheme. Lines 14-18 show standard SOAP elements.

3.2.5 Response Example 2

(01) <s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope"

(02)             xmlns:a="http://www.w3.org/2005/08/addressing">

(03)   <s:Header>

(04)     <a:To>

(05)       soap.udp://fabrikam2.com:54322/Client

(06)     </a:To>

(07)     <a:Action>http://fabrikam.com/ProbeMatch</a:Action>

(08)     <a:MessageID>

(09)       urn:uuid:5a6ed11a-7a80-409a-82bf-43c4c5092911

(10)     </a:MessageID>

(11)     <a:RelatesTo>

(12)       urn:uuid:9ceada16-2403-4404-a8cc-60799acd9d1c

(13)     </a:RelatesTo>

(14)   </s:Header>

(15)   <s:Body>

(16)     ...

(17)   </s:Body>

(18) </s:Envelope>

This example shows a response SOAP message. Lines 01-03 are standard SOAP elements. Lines 04-13 specify various WS-Addressing headers. Note that the [destination] for the message contains an addressable URI that uses the soap.udp scheme. Line 11 shows a [relationship] header indicating that this message is a reply to the example message in Section 3.2.4. Lines 14-18 show standard SOAP elements.

3.3 Multicast

The message patterns defined above can be used with unicast or multicast transmission of UDP datagrams with the following restriction: The response in a request-response message pattern MUST NOT be multicast.

Note that in the case of a multicast request, unicast response MEP, the sender of the request might receive multiple responses.

Multicast SOAP/UDP datagrams SHOULD be scoped to ensure they are not forwarded beyond the boundaries of the administrative system. For IPv4, this can be done with either time-to-live (TTL) field or administrative scopes [RFC 2365] depending on what is implemented in the network. For IPv6, this can be done by setting the hop-limit field. If either IPv4 TTL or IPv6 hop-limit is used, it is RECOMMENDED that its value be set to 1.

The destination IP address of a multicast message MUST be a multicast group.

3.4 Retransmission

To avoid repeated packet collisions, any retransmission implementation SHOULD observe good practices such as using exponential back-off algorithms and spreading. An implementation MAY use the algorithm defined in Appendix A. For each transmission of such a message, the value of the [message id] property MUST be the same.

4      Message Encoding

The algorithm defined in Appendix F of XML 1.0 [XML 1.0] SHOULD be used to determine whether a message is encoded as XML. If use of said algorithm does not result in an XML serialization, the encoding is undefined.

5      URI Scheme

This section defines a URI scheme for UDP endpoints. The scheme allows hostname and port to be specified. Resolving such a URI provides the information needed to send messages to a UDP endpoint per the protocol defined in this document.

5.1 Syntax

The syntax of the URI scheme is as follows:

soap.udp://<host>:<port>[/<rel_path>][?<query>]

The syntax and interpretation of the host, port, rel_path and query portions is as defined in RFC 3986 [RFC 3986].

5.2 Semantics

The semantics of resolving a soap.udp URI are as follows:

1.     Use the port portion as the port number.

2.     Resolve the host portion to an IP address.

3.     Using the message protocol defined in this document, send a message to the IP address determined in step 2 using the port number determined in step 1.

6      Security Considerations

It is recommended that all messages be secured using the mechanisms described in [WS-Security] to prevent tampering or falsification.

All critical headers, such as those described in [WS-Addressing], and the message body, need to be included in signatures to bind all parts of the message together.

Recipients SHOULD verify that the sender has the right to speak for the specified source or response location (if one is provided).

Messages SHOULD be accepted and processed only from trusted sources (either directly trusted or indirectly trusted via third parties).

The UDP packet size introduces a challenge for secure messages due to its limited size.  For this reason it is recommended that security tokens not be passed but referenced using the Key Identifier mechanisms described in [WS-Security].

SOAP messages containing a [reply endpoint] property transmitted over UDP MAY be rejected by a recipient due to security concerns such as distributed denial-of-service attacks.

7      Conformance

A conformant implementation MUST satisfy all the MUST or REQUIRED level requirements defined herein.

Appendix A. Example retransmission algorithm (non-normative)

Constants referenced within the algorithm are defined in Table 2 (for unicast messages) and Table 3 (for unreliable multicast messages). The value of those constants (as defined in Table 2 and Table 3) is non-normative. Implementations and other specifications MAY override the value of those constants.

Retry and back-off algorithm.

1.     Transmit;

2.     if *_UDP_REPEAT <= 0 go to Step 11;

3.     else *_UDP_REPEAT--;

4.     Generate a random number T in [UDP_MIN_DELAY .. UDP_MAX_DELAY];

5.     Wait T milliseconds;

6.     Retransmit;

7.     if *_UDP_REPEAT <= 0 goto Step 11;

8.     else *_UDP_REPEAT--;

9.     T = T * 2;If T > UDP_UPPER_DELAY then T = UDP_UPPER_DELAY;

10.  go to 5;

11.  Done.

Table 2. Protocol retry and back-off constants for unicast messages

Constant / Message

Value

UNICAST_UDP_REPEAT

1

UDP_MIN_DELAY

50

UDP_MAX_DELAY

250

UDP_UPPER_DELAY

500

Table 3. Protocol retry and back-off constants for unreliable multicast messages

Constant / Message

Value

MULTICAST_UDP_REPEAT

2

UDP_MIN_DELAY

50

UDP_MAX_DELAY

250

UDP_UPPER_DELAY

500

Appendix B.  Example duplicate detection mechanisms (non-normative)

A receiver keeps a list of the last n messages received along with the [message id] property [WS-Addressing] associated with each message. When a new (non-duplicate) message arrives, the oldest message is removed from the list.

A receiver tracks all messages received in the last x milliseconds along with the [message id] property [WS-Addressing] associated with each message. Messages received more than x milliseconds ago are removed from the list.

For both approaches any message arriving with a [message id] property identical to one of those the receiver has in its list is a duplicate. Messages with unique values for the [message id] property are not duplicates.

The timestamp specified in the Security header block [WS-Security] MAY be used to limit the duration for which [message id] properties need to be remembered.

Appendix C. Acknowledgements

The following individuals have participated in the creation of this specification and are gratefully acknowledged:

Participants:

Geoff Bullen, Microsoft Corporation

Steve Carter, Novell

Dan Conti, Microsoft Corporation

Doug Davis, IBM

Scott deDeugd, IBM
Oliver Dohndorf, Technische Universitat Dortmund

Dan Driscoll, Microsoft Corporation

Colleen Evans, Microsoft Corporation

Max Feingold, Microsoft Corporation

Travis Grigsby, IBM

Francois Jammes, Schneider Electric

Ram Jeyaraman, Microsoft Corporation

Mike Kaiser, IBM

Supun Kamburugamuva, WSO2

Devon Kemp, Canon Inc.

Akira Kishida, Canon Inc.

Jan Krueger, Technische Universitaet Dortmund
Mark Little, Red Hat

Dr. Ingo Lueck, Technische Universitaet Dortmund

Jonathan Marsh, WSO2

Carl Mattocks

Antoine Mensch

Jaime Meritt, Progress Software

Vipul Modi, Microsoft Corporation

Anthony Nadalin, IBM

Tadahiro Nakamura, Canon Inc.

Masahiro Nishio, Canon Inc.

Toby Nixon, Microsoft Corporation

Shin Ohtake, Fuji Xerox Co., Ltd.

Venkat Reddy, CA

Alain Regnier, Ricoh Company, Ltd.

Hitoshi Sekine, Ricoh Company, Ltd.
Yasuji Takeuchi, Konica Minolta Business Technologies

Hiroshi Tamura, Ricoh Company, Ltd.

Minoru Torii, Canon Inc.

Asir S Vedamuthu, Microsoft Corporation

David Whitehead, Lexmark International Inc.

Don Wright, Lexmark International Inc.

Prasad Yendluri, Software AG, Inc.

Elmar Zeeb, University of Rostock

Gottfried Zimmermann

Co-authors of the initial contributions:

This document is based on initial contributions to the OASIS WS-DD Technical Committee by the following co-authors.

Harold Combs, Lexmark International Inc.
Martin Gudgin (editor), Microsoft Corporation
John Justice, Microsoft Corporation
Gopal Kakivaya, Microsoft Corporation
David Lindsey, Lexmark International Inc.
David Orchard, BEA Systems, Inc.

Alain Regnier, Ricoh Company Limited
Jeffrey Schlimmer, Microsoft Corporation
Stacy Simpson, Lexmark International Inc.
Hiroshi Tamura, Ricoh Company Limited
Don Wright, Lexmark International Inc.
Kenny Wolf, Microsoft Corporation

Acknowledgements of the initial contributions:

This specification has been developed as a result of joint work with many individuals and teams, including:

 

Erik Christensen, Microsoft Corporation

David Langworthy, Microsoft Corporation

Yaniv Pessach, Microsoft Corporation

Stefan Pharies, Microsoft Corporation

Sam Rhodus, Lexmark International Inc.

Jerry Thrasher, Lexmark International Inc.

Mike Vernal, Microsoft Corporation

Elliot Waingold, Microsoft Corporation

Dave Whitehead, Lexmark International Inc.

Appendix D. Revision History

 

Revision

Date

Editor

Changes Made

wd-01

September 16, 2008

Ram Jeyaraman

Created the initial working draft by converting the input specification to OASIS template.

wd-02

September 29, 2008

Ram Jeyaraman

Updated document identifier, added co-chair and editor names, use of urn:uuid (issue 50) in examples.

wd-03

January15, 2009

Ram Jeyaraman

Created working draft 03 by applying the proposed resolutions of the following issues to CD-01 version:

116 - Update references and related changes

136 - SOAP-over-UDP - UNICAST_UDP_REPEAT and MULTICAST_UDP_REPEAT constant values

Updated copyright year to 2009.

Appendix C (Acknowledgements). Included a list of TC participants.

wd-04

February 09, 2009

Ram Jeyaraman

Editorial corrections: Converted citations to hyperlinks, fixed links to tables, fixed Appendix heading.

wd-05

April 09, 2009

Ram Jeyaraman

Updates to Appendix C (Acknowlegements).

Changes resulting from issue pr007.