[tor-bugs] #19569 [Obfuscation/Snowflake]: DataChannel-only libwebrtc

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#19569: DataChannel-only libwebrtc
---------------------------------------+---------------------
     Reporter:  arlolra                |      Owner:  arlolra
         Type:  enhancement            |     Status:  new
     Priority:  Medium                 |  Milestone:
    Component:  Obfuscation/Snowflake  |    Version:
     Severity:  Normal                 |   Keywords:
Actual Points:                         |  Parent ID:  #19001
       Points:                         |   Reviewer:
      Sponsor:                         |
---------------------------------------+---------------------
 Equivalently, https://github.com/keroserene/go-webrtc/issues/10

 This is my first working patch,
 https://gist.github.com/arlolra/f43b3e980e88a534b61c7a5ef3903124

 It applies against f33698296719f956497d2dbff81b5080864a8804, which was
 HEAD of branch-heads/52 when I started, and the current build of go-webrtc
 (see https://github.com/keroserene/go-webrtc/pull/42)

 To use it,

 {{{
 gclient sync -r f33698296719f956497d2dbff81b5080864a8804
 cd src/
 git am the.patch
 GYP_DEFINES="include_tests=0 include_examples=0" python
 webrtc/build/gyp_webrtc webrtc/api/api.gyp
 ninja -C out/Release
 }}}

 Then do the usual concatenating stuff.  It's important to note here that
 the patch ifdefs in a few headers, so be sure to update those or you'll
 get some segfaults.

 All the go-webrtc / snowflake tests passed, and I was able to bootstrap a
 tor client with it.

 I was also able to make this change to `go-webrtc/webrtc-darwin-amd64.pc`,

 {{{
 -       -framework AppKit \
 -       -framework CoreAudio \
 -       -framework AudioToolbox
 +       -framework AppKit
 }}}

 This trimmed the build by about 10MB, and I assume with a little more work
 can be improved.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19569>
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