Re: [MMUSIC] Magnus Westerlund's Discuss on draft-ietf-mmusic-data-channel-sdpneg-25: (with DISCUSS and COMMENT)
Magnus Westerlund <magnus.westerlund@ericsson.com> Tue, 09 April 2019 09:00 UTC
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From: Magnus Westerlund <magnus.westerlund@ericsson.com>
To: Adam Roach <adam@nostrum.com>, The IESG <iesg@ietf.org>
CC: "mmusic-chairs@ietf.org" <mmusic-chairs@ietf.org>, "draft-ietf-mmusic-data-channel-sdpneg@ietf.org" <draft-ietf-mmusic-data-channel-sdpneg@ietf.org>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] Magnus Westerlund's Discuss on draft-ietf-mmusic-data-channel-sdpneg-25: (with DISCUSS and COMMENT)
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Date: Tue, 09 Apr 2019 09:00:18 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mmusic/9J8SPQpJ4EE3cybmm0OxhHWLruw>
Subject: Re: [MMUSIC] Magnus Westerlund's Discuss on draft-ietf-mmusic-data-channel-sdpneg-25: (with DISCUSS and COMMENT)
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On 2019-04-08 17:55, Adam Roach wrote: On 4/5/19 7:04 AM, Magnus Westerlund via Datatracker wrote: ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- There might be a serious issue in label definition. 5.1.3. Label Parameter The 'label' parameter indicates the name of the channel. It represents a label that can be used to distinguish, in the context of the WebRTC API [WebRtcAPI], an RTCDataChannel object from other RTCDataChannel objects. This parameter maps to the 'Label' parameter defined in [I-D.ietf-rtcweb-data-protocol]. The 'label' parameter is optional. If it is not present, then its value defaults to the empty string. label-opt = "label=" quoted-string quoted-string = DQUOTE *(quoted-char / escaped-char) DQUOTE quoted-char = SP / quoted-visible quoted-visible = %x21 / %x23-24 / %x26-7E ; VCHAR without " or % escaped-char = "%" HEXDIG HEXDIG I interpret that as the intention is to enable the SDP Attribute to carry the label as defined in W3C API. That value is in the current candidatate specification an https://www.w3.org/TR/webrtc/ as an USVSsting (https://heycam.github.io/webidl/#idl-USVString). And in the reference version of the WebRTC API as an DOMstring. Both are not limited to ASCII and may contain any Unicode characters. Thus the escaping mechanism defined appear to be insufficient. I think the "quoted-string" need a definition of what type of string this truly are so that it is clear what a character in the string is. In addition the specification of escaping is undersspecified. I would recommend at least adding discussion of the need and how to escape DQUOTE and % that can be relatively common operations. I can see that this could benefit from some explicit detail about how to convert the cited USVString string into the "quoted-string" construct defined here. I think this roughly consists of: * Serialize the WebRTC label as a UTF-8 string * Treat the UTF-8 serialization as a series of bytes * For each byte in the serialization: * If the byte can be expressed as a `quoted-char`, do so * Otherwise, express the byte as an `escaped-char`. Would including text to that effect satisfy your concern? Yes it would be clear what is expected. However, I fail to understand why one need to ASCIIify and escape the UTF-8 encoded characters where one could simply define the label value as an UTF-8 string something that is compatible with SDP specification. Wouldn't that reduce the set of characters needing escaping to a much smaller set. Cheers Magnus Westerlund ---------------------------------------------------------------------- Network Architecture & Protocols, Ericsson Research ---------------------------------------------------------------------- Ericsson AB | Phone +46 10 7148287 Torshamnsgatan 23 | Mobile +46 73 0949079 SE-164 80 Stockholm, Sweden | mailto: magnus.westerlund@ericsson.com<mailto:magnus.westerlund@ericsson.com> ----------------------------------------------------------------------
- [MMUSIC] Magnus Westerlund's Discuss on draft-iet… Magnus Westerlund via Datatracker
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Adam Roach
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Magnus Westerlund
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Adam Roach
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Magnus Westerlund
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Adam Roach
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Magnus Westerlund
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Roni Even (A)
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Adam Roach
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Magnus Westerlund
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Roni Even (A)
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Magnus Westerlund
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Roni Even (A)
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Adam Roach
- Re: [MMUSIC] Magnus Westerlund's Discuss on draft… Magnus Westerlund