Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
"Ram Mohan R (rmohanr)" <rmohanr@cisco.com> Thu, 19 January 2017 04:00 UTC
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From: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>
To: Alissa Cooper <alissa@cooperw.in>
Thread-Topic: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Date: Thu, 19 Jan 2017 04:00:11 +0000
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Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, Alexey Melnikov <aamelnikov@fastmail.fm>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, The IESG <iesg@ietf.org>
Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT)
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Hi Alissa, I don’t have a strong opinion on this. Either way (having a single attribute or two different SDP attributes) would work. Implementations can still retrieve the value (URI) of that attribute and based on the proto line (TCP/WS/BFCP or TCP/WSS/BFCP) match the URI against ws or wss schema defined in RFC6455. I would expect such a validation to happen across layers. The SDP stack parser to look at the proto line transport value (TCP/WS/BFCP or TCP/WSS/BFCP) and check for presence of a=websocket-uri attribute. The value of this attribute (ws or wss schema) can be passed *as is* to the application (in this case BFCP client application) which will validate it against the schema in RFC 6455. I am OK to incorporate this comment to have a single SDP attribute. Regards, Ram -----Original Message----- From: Alissa Cooper <alissa@cooperw.in> Date: Thursday, 19 January 2017 at 1:58 AM To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com> Cc: Alexey Melnikov <aamelnikov@fastmail.fm>, The IESG <iesg@ietf.org>, "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT) Resent-From: <alias-bounces@ietf.org> Resent-To: <rmohanr@cisco.com>, <gsalguei@cisco.com> Resent-Date: Thursday, 19 January 2017 at 1:58 AM Hi Ram, I had some further conversation with Alexey on the side and wanted to come back to a question he posed: is there a reason why a=ws-uri and a=wss-uri both need to be specified? Why can’t a single label be specified, say a=websocket-uri, and then have normative language requiring the scheme in the URI itself to match what’s in the associated m-line (ws:// for TCP/WS/BFCP and wss:// for TCP/WSS/BFCP)? Won’t it be more efficient for implementations to grab the URI itself anyway and check that the scheme matches the m-line? Thanks, Alissa > On Jan 17, 2017, at 9:40 AM, Ram Mohan R (rmohanr) <rmohanr@cisco.com> wrote: > > Alissa, > > I am fine with the proposed text. > > Thanks, > Ram > > -----Original Message----- > From: Alissa Cooper <alissa@cooperw.in> > Date: Tuesday, 17 January 2017 at 8:07 PM > To: Alexey Melnikov <aamelnikov@fastmail.fm> > Cc: The IESG <iesg@ietf.org>, "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org>, "Ram Mohan R (rmohanr)" <rmohanr@cisco.com> > Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT) > > Alexey, would the following changes clarify things? > > Section 4.1 > OLD > the server side, which could be either > the offerer or answerer, MUST add an "a=ws-uri" or "a=wss-uri" > attribute in the media section > NEW > the server side, which could be either > the offerer or answerer, MUST add an "a=ws-uri" or "a=wss-uri” > attribute (but not both) in the media section > > Section 4.3 > OLD > If the answers assigns SDP "setup" attribute with "passive", then it > MUST have a URI in either "a=ws-uri" or "a=wss-uri" attribute > depending on whether the application uses WebSocket or > secureWebSocket. > NEW > If the answers assigns SDP "setup" attribute with "passive", then it > MUST have a URI in either "a=ws-uri" or "a=wss-uri" attribute > (but not both) in the media section, depending on whether the application uses WebSocket or > secureWebSocket. > > Ram, would you be okay with those clarifications? > > Alissa > > >> On Jan 16, 2017, at 10:09 AM, Ram Mohan R (rmohanr) <rmohanr@cisco.com> wrote: >> >> Hi Alexey, >> >> -----Original Message----- >> From: Alexey Melnikov <aamelnikov@fastmail.fm> >> Date: Monday, 16 January 2017 at 8:25 PM >> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG <iesg@ietf.org> >> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org> >> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT) >> >> Hi Ram, >> >> On Mon, Jan 16, 2017, at 02:49 PM, Ram Mohan R (rmohanr) wrote: >>> Hi Alexey, >>> >>> Please see inline <Ram> >>> >>> -----Original Message----- >>> From: Alexey Melnikov <aamelnikov@fastmail.fm> >>> Date: Monday, 16 January 2017 at 7:57 PM >>> To: "Ram Mohan R (rmohanr)" <rmohanr@cisco.com>, The IESG <iesg@ietf.org> >>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" >>> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" >>> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, >>> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org> >>> Subject: Re: [bfcpbis] Alexey Melnikov's Discuss on >>> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT) >>> >>> Hi Ram, >>> >>> On Mon, Jan 16, 2017, at 06:09 AM, Ram Mohan R (rmohanr) wrote: >>>> Hi Alexey, >>>> >>>> Thanks for your feedback. Please see inline <Ram> >>>> >>>> -----Original Message----- >>>> From: bfcpbis <bfcpbis-bounces@ietf.org> on behalf of Alexey Melnikov >>>> <aamelnikov@fastmail.fm> >>>> Date: Saturday, 14 January 2017 at 3:49 AM >>>> To: The IESG <iesg@ietf.org> >>>> Cc: "draft-ietf-bfcpbis-sdp-ws-uri@ietf.org" >>>> <draft-ietf-bfcpbis-sdp-ws-uri@ietf.org>, "bfcpbis@ietf.org" >>>> <bfcpbis@ietf.org>, "Charles Eckel (eckelcu)" <eckelcu@cisco.com>, >>>> "bfcpbis-chairs@ietf.org" <bfcpbis-chairs@ietf.org> >>>> Subject: [bfcpbis] Alexey Melnikov's Discuss on >>>> draft-ietf-bfcpbis-sdp-ws-uri-08: (with DISCUSS and COMMENT) >>>> >>>> Alexey Melnikov has entered the following ballot position for >>>> draft-ietf-bfcpbis-sdp-ws-uri-08: Discuss >>>> >>> >>>> ---------------------------------------------------------------------- >>>> DISCUSS: >>>> ---------------------------------------------------------------------- >>>> >>>> This is generally a well written document, but I have a small list of >>>> issues that I would like to discuss before recommending its approval: >>>> >>>> 1) Are a=ws-uri and a=wss-uri mutually exclusive? (Section 4.3 is a >>>> good >>>> place to mention what to do if both are specified). >>>> >>>> <Ram> Yes kind of. In a given media line (m= line) we will either have >>>> a=ws-uri or a=wss-uri. That said a response from a BFCP server using >>>> webSocket as a transport can >>>> have two media lines one with ws and other with wss. Something like: >>>> >>>> Answer (server): >>>> m=application 50000 TCP/WSS/BFCP * >>>> a=setup:passive >>>> a=connection:new >>>> a=wss-uri:wss://bfcp-ws.example.com?token=3170449312 >>>> m=application 50000 TCP/WS/BFCP * >>>> a=setup:passive >>>> a=connection:new >>>> a=ws-uri:ws://bfcp-ws.example.com?token=3170449312 >>> >>> [Alexey]: This is exactly my problem, you should specify how a >>> recipient >>> should handle your example above. If you only have 1 attribute, the >>> problem goes away entirely. >>> >>> <Ram> in the above case, they are still two different m= lines. The >>> receiver (after offer/answer is done) of this SDP connects to the URI >>> mentioned in that m= line. >>> Note I just re-used the same URL/port in the example above. If there are >>> multiple m=application media lines (they will be for different >>> applications) being negotiated in SDP, one application may use secure WS >>> and other application may use non-secure WS. The client after it receives >>> the answer SDP will just setup the connection to the URI specified in the >>> attribute. >> >> Sorry, I was thinking about different example: >> >> m=application 50000 TCP/WSS/BFCP * >> a=setup:passive >> a=connection:new >> a=wss-uri:wss://bfcp-ws.example.com?token=3170449312 >> a=ws-uri:ws://bfcp-ws.example.com?token=3170449312 >> >> You have 2 conflicting URIs for the same m= line. Is this possible? >> >> <Ram> No this is not possible. If the transport is TCP/WSS/BFCP we should have only a=wss-uri. If transport is TCP/WS/BFCP we should have only a=ws-uri. >> >> Regards, >> Ram >> >>> I don’t see any problem in here. >>> >>> Regards, >>> Ram >>> >>>> Why not a single attribute, considering that both ws: and wss: URIs >>>> are >>>> possible? >>>> >>>> <Ram> I would still prefer two attributes. We just followed the >>>> convention / approach that was used in [RFC6455]. >>> >>> >> >> > > >
- [bfcpbis] Alexey Melnikov's Discuss on draft-ietf… Alexey Melnikov
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alexey Melnikov
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alexey Melnikov
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alissa Cooper
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alissa Cooper
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alexey Melnikov
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alexey Melnikov
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Ram Mohan R (rmohanr)
- Re: [bfcpbis] Alexey Melnikov's Discuss on draft-… Alexey Melnikov