<title>Jingle SOCKS5 Bytestreams Transport Method</title>
<abstract>This specification defines a Jingle transport method that results in sending data via the SOCKS5 Bytestreams (S5B) protocol defined in XEP-0065. Essentially this transport method reuses XEP-0065 semantics for sending the data and defines native Jingle methods for starting and ending an S5B session.</abstract>
<remark><p>Minor changes to track modifications to XEP-0166; updated security considerations for consistency with other transport methods; added section on service discovery.</p></remark>
<remark><p>Initial published version.</p></remark>
</revision>
<revision>
<version>0.0.3</version>
<date>2009-02-18</date>
<initials>psa</initials>
<remark><p>Clarified order of events to be consistent with raw-udp and ice-udp.</p></remark>
</revision>
<revision>
<version>0.0.2</version>
<date>2009-02-11</date>
<initials>dm</initials>
<remark><p>Add additional text to use NAT assisting protocols and allow the responder to also send <streamhost/> information. This change required the introduction of streamhost-used and streamhost-error.</p></remark>
</revision>
<revision>
<version>0.0.1</version>
<date>2009-02-10</date>
<initials>psa</initials>
<remark><p>Rough draft.</p></remark>
</revision>
</header>
<section1topic='Introduction'anchor='intro'>
<p>&xep0166; defines a framework for negotiating and managing data sessions over XMPP. In order to provide a flexible framework, the base Jingle specification defines neither data transport methods nor application formats, leaving that up to separate specifications. The current document defines a transport method for establishing and managing data exchanges between XMPP entities using the existing SOCKS5 Bytestreams (S5B) protocol specified in &xep0065;. This "jingle-s5b" method results in a streaming transport method suitable for use in Jingle application types where packet loss cannot be tolerated (e.g., file transfer).</p>
<p>It is RECOMMENDED that a client offers as much <streamhost/> elements with itself as StreamHost as possible. This includes opening the TCP port on all available interfaces the user wants to use (e.g. maybe not an expensive UMTS link), both the IPv4 and IPv6 of that interface (if available), and using an assisting NAT protocol if possible. If the client knows it is behind and the router announces UPnP IGD or NAT-PMP support, the client SHOULD map the open port to the external interface of the router and include the public IP address and port information in the <streamhost/> offers. To increase the chance of success without using a proxy, this specification allows the responder to also send offers.</p>
</section1>
<section1topic='Protocol'anchor='protocol'>
<para>The basic flow is as follows.</para>
<code><![CDATA[
Romeo Juliet
| |
| session-initiate |
| (with S5B info) |
|--------------------------------->|
| ack |
|<---------------------------------|
| session-accept |
| (with S5B info) |
|<---------------------------------|
| ack |
|--------------------------------->|
| streamhost transport-info |
|<---------------------------------|
| ack |
|--------------------------------->|
| streamhost-used transport-info |
|--------------------------------->|
| ack |
|<---------------------------------|
| S5B "SESSION" |
|<================================>|
| session-terminate |
|<---------------------------------|
| ack |
|--------------------------------->|
| |
]]></code>
<p>This flow is illustrated in the following examples (to prevent confusion these use a "stub" transport instead of a real application type).</p>
<p>First the initiator sends a Jingle session-initiate request that contains one or more transport candidates, which in jingle-s5b are XEP-0065 streamhosts.</p>
<p>Depending on the application type, a user agent controlled by a human user might need to wait for the user to affirm a desire to proceed with the session before continuing. When the user agent has received such affirmation (or if the user agent can automatically proceed for any reason, e.g. because no human intervention is expected or because a human user has configured the user agent to automatically accept sessions with a given entity), it returns a Jingle session-accept message. This message MUST contain a &TRANSPORT; element qualified by the 'urn:xmpp:jingle:transports:s5b:0' namespace, which SHOULD in turn contain one <streamhost/> element for each SOCKS5 Bytestreams candidate generated by or known to the responder, but MAY instead be empty if the responder does not wish to offer any streamhosts or wishes to send each candidate as the payload of a transport-info message.</p>
<p>Note: If the responder sends streamhost candidates, the chances of a successful connection are increased. For example, the initiator might be behind a NAT or might have no access to a proxy, whereas the responder might have a public IP address, might know about a streamhost proxy, or might have NAT penetration support like NAT-PMP in the router.</p>
<p>In the following example, Juliet's client is the StreamHost and opens one port. The provided <streamhost/> elements are the (private) IPv4 address of the interface, a (public) IPv6 address, and the public IPv4 address created by mapping the private IP address/port using NAT-PMP.</p>
<examplecaption="Responder sends session-accept with streamhost candidates"><