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From: Dave Taht <dave.taht@gmail.com>
To: Juliusz Chroboczek <jch@irif.fr>
Cc: galene@lists.galene.org
Subject: [Galene] Re: Peer-to-peer file transfer in Galene
Date: Sun, 30 Jan 2022 08:45:46 -0800	[thread overview]
Message-ID: <CAA93jw66NjMDaqZwTkbZeQE6vEPRrD0w93SzZGwOwwCpoCXPxg@mail.gmail.com> (raw)
In-Reply-To: <877dah9nyn.wl-jch@irif.fr>

https://webtorrent.io/ was pretty neat.

thx for going back to having fun with galene, btw. using computers
should be fun!

On Sun, Jan 30, 2022 at 8:40 AM Juliusz Chroboczek <jch@irif.fr> wrote:
>
> Hi,
>
> I've been trying to refrain from adding too many features that are not
> related to videoconferencing, but given the lack of simple to setup
> peer-to-peer file transfer protocols, I've given in on this one.
>
> In order to send a file to a member of the group, just type "sendfile user"
> and follow the prompts.
>
> This is stricly peer-to-peer: the server is only used for signalling
> (exchanging IP addresses and cryptographic keys).  The protocol is
> somewhat convoluted (and undocumented), in order to satisfy the following
> properties:
>
>   - rejecting an offered file does not disclose your IP address to the peer;
>   - there is an application handshake at the end, so the sender has
>     reliable feedback on whether the file went through.
>
> Of course, sending or accepting a file does disclose your IP address --
> that's the nature of peer-to-peer.
>
> While the protocol is reasonably secure (SCTP over DTLS), anyone who
> controls the server can trivially set up an MITM attack.  As always,
> please set up your own server if you're exchanging sensitive data.
>
> It's not very efficient.  On the sender side, we manually chop the data
> into 16kB chunks (so that we don't run afoul of SCTP limitations).  Even
> worse, on the receiver side, the whole file is kept in memory (since
> Chrome does not support RTCDataChannel.binaryType being set to "blob", and
> since no browser supports streaming received data to disk).  Still, it
> should be sufficient for sharing your slides during a presentation or
> sending funny pictures during a boring lecture.
>
> -- Juliusz
> _______________________________________________
> Galene mailing list -- galene@lists.galene.org
> To unsubscribe send an email to galene-leave@lists.galene.org



-- 
I tried to build a better future, a few times:
https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org

Dave Täht CEO, TekLibre, LLC

  parent reply	other threads:[~2022-01-30 16:45 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-30 16:40 [Galene] " Juliusz Chroboczek
2022-01-30 16:44 ` [Galene] " Juliusz Chroboczek
2022-01-30 16:45 ` Dave Taht [this message]
2022-01-30 17:22   ` Juliusz Chroboczek
2022-01-30 17:34     ` Dave Taht
2022-01-30 18:00       ` Juliusz Chroboczek
2022-01-30 18:12         ` Dave Taht
2022-01-30 18:19           ` Juliusz Chroboczek
2022-01-30 18:23             ` Dave Taht
2022-01-30 18:34               ` Juliusz Chroboczek

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