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feat: Add option to disable DNS lookups in toxcore. #2694

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@iphydf iphydf commented Feb 17, 2024

Allows clients to prevent leaking IP addresses through DNS lookups. This option, together with disabling Tox UDP, entirely prevents any UDP packets being sent by toxcore.


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@iphydf iphydf added this to the v0.2.20 milestone Feb 17, 2024
@iphydf iphydf force-pushed the disable-dns branch 6 times, most recently from deae4d9 to f1045da Compare February 17, 2024 20:32
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codecov bot commented Feb 17, 2024

Codecov Report

Attention: Patch coverage is 72.22222% with 5 lines in your changes missing coverage. Please review.

Project coverage is 73.10%. Comparing base (fa20168) to head (df6d87e).
Report is 11 commits behind head on master.

Files with missing lines Patch % Lines
toxcore/network.c 55.55% 4 Missing ⚠️
toxcore/DHT.c 0.00% 1 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##           master    #2694      +/-   ##
==========================================
+ Coverage   73.03%   73.10%   +0.07%     
==========================================
  Files         149      149              
  Lines       30531    30537       +6     
==========================================
+ Hits        22298    22325      +27     
+ Misses       8233     8212      -21     

☔ View full report in Codecov by Sentry.
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@emdee-is
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This should be labeled with api-break as changes it the fields in toxOptions.

@Green-Sky
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This should be labeled with api-break as changes it the fields in toxOptions.

maybe, direct usage of the options struct is deprecated.

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iphydf commented Feb 17, 2024

https://github.com/TokTok/c-toxcore/blob/master/toxcore/tox.h#L526-L527

The memory layout of this struct (size, alignment, and field order) is not part of the ABI.

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Reviewed 11 of 13 files at r1, 1 of 1 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: :shipit: complete! 1 of 1 approvals obtained

@emdee-is
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https://github.com/TokTok/c-toxcore/blob/master/toxcore/tox.h#L526-L527

The memory layout of this struct (size, alignment, and field order) is not part of the ABI.

Adding getters and setters is a part of the ABI in semantic versionsing: #2702

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iphydf commented Feb 21, 2024

https://github.com/TokTok/c-toxcore/blob/master/toxcore/tox.h#L526-L527

The memory layout of this struct (size, alignment, and field order) is not part of the ABI.

Adding getters and setters is a part of the ABI in semantic versionsing: #2702

Can you quote and link to a spec of semantic versioning that confirms this?

@emdee-is
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emdee-is commented Feb 22, 2024

Adding getters and setters is a part of the ABI in semantic versionsing: #2702

Can you quote and link to a spec of semantic versioning that confirms this?

I've QAed Python for 2 of the biggest companies in the world, and they have coding standards that specify this sort of thing (in one of them I wrote the first draft for Python), but I can't cite their internal documents. In brief:

    1. MAJOR version when you make incompatible API changes,
    1. MINOR version when you add functionality in a backwards compatible manner, and
    1. PATCH version when you make backwards compatible bug fixes

Adding getters and setters is adding new funtionality, so must be in a new minor. I also know this is the case for the Python project from having submitted a module into the Python standard library: their developers all know the rules and follow them strictly.

You're "releasing" big aglomerations rarely (years) and features go in without notice or planning or discussion. I assume that this may be the reason the project has lost so many developers and GUIs.

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iphydf commented Feb 22, 2024

I understand now where the confusion is. Let me clarify: in toxcore, we've decided to use semver without patch, and shifted the version right by 1 position: 0.major.minor, and we have no patch level releases. This is documented in tox.h.

That is, until we release 1.0.0, at which point it'll be semver with patch.

@emdee-is
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You're right - I missed that comment.

Allows clients to prevent leaking IP addresses through DNS lookups. This
option, together with disabling Tox UDP, entirely prevents any UDP
packets being sent by toxcore.
@iphydf iphydf marked this pull request as ready for review March 28, 2024 16:19
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I approve the code changes, but why is the behavoir explained inverted. Why is dns_enabled explained by the not state?

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iphydf commented Mar 28, 2024

I approve the code changes, but why is the behavoir explained inverted. Why is dns_enabled explained by the not state?

Because it's enabled by default, and has been true forever, so I figured it would be clearer to existing client devs if we explain what happens if you disable it explicitly.

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Reviewed 3 of 3 files at r4, all commit messages.
Reviewable status: :shipit: complete! 1 change requests, 1 of 1 approvals obtained (waiting on @iphydf)


toxcore/tox.h line 685 at r4 (raw file):

     *
     * Default: true. May become false in the future (0.3.0).
     */

This comment block is exceeding the 80-column width.

@sh3ll4rpw
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When this will be merged? I'm waiting for a long time

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6 participants