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dns: stop using cares DNS resolver#2618

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Augustyniak merged 15 commits intomainfrom
remove-support-for-cares
Oct 21, 2022
Merged

dns: stop using cares DNS resolver#2618
Augustyniak merged 15 commits intomainfrom
remove-support-for-cares

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@Augustyniak Augustyniak commented Oct 19, 2022 •
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Description: Remove the usage of cares DNS resolver, use getaddrinfo based DNS resolver instead. Fixes #2534.
Risk Level: Low, Envoy Mobile default was not to use cares.
Testing: Existing unit/integration tests.
Docs Changes: N/A
Release Notes: Done

Signed-off-by: Rafal Augustyniak raugustyniak@lyft.com

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remove usage of cares
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lint fix
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remove the use of removed API
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Augustyniak commented Oct 19, 2022

/retest

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fix cc tests
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Augustyniak commented Oct 19, 2022

/retest

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Augustyniak commented Oct 19, 2022

/retest

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fix
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Augustyniak commented Oct 19, 2022

/retest

@Augustyniak Augustyniak changed the title remove usage of cares dns: stop using cares DNS resolver Oct 19, 2022
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@Augustyniak Augustyniak marked this pull request as ready for review October 19, 2022 16:57
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update starting_envoy doc
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Augustyniak commented Oct 19, 2022

I think that I should be able to remove some dependencies on cares from BUILD files too.

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Augustyniak commented Oct 19, 2022

/retest

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Merge branch 'main' into remove-support-for-cares
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Signed-off-by: Rafal Augustyniak <raugustyniak@lyft.com>
alyssawilk
alyssawilk reviewed Oct 20, 2022
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sweet.

remove from envoy_build_config/extensions_build_config.bzl as well?

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remove cares code
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Augustyniak commented Oct 20, 2022

remove from envoy_build_config/extensions_build_config.bzl as well?

I do not see cares referenced in there.

I was able to remove a few more lines of code related to cares tho - c95b854

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Augustyniak commented Oct 20, 2022

/retest

alyssawilk
alyssawilk reviewed Oct 20, 2022
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library/cc/engine_builder.cc
}

std::string EngineBuilder::generateConfigStr() const {
#if defined(__APPLE__)
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I don't have high confidence of consistently using the apple resolver without this block - I'd think we'd want to replace cares here with getaddrinfo. Do we have any e2e validation for that? Alternately, can you get a secondary Lyft reviewer?
cc @RyanTheOptimist because perhaps it won't take effect until we switch to the c++ builder by defualt

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If I'm following the PR and your comment correctly, I think the reason we'll use the Apple resolver without this block regardless of the Builder type (after this PR lands) is because of the change to config.cc:

https://github.com/envoyproxy/envoy-mobile/pull/2618/files#diff-1af53ae37f8c227f37b80bcb6e2335f55b2f830aa658ac77e099f2549f157712

Unless there is code to specifically override dns_resolver_config (which there shouldn't be since @Augustyniak seems to have removed it in this PR), it will use the Apple resolver on iOS and getaddrinfo elsewhere. Does that sound right to you?

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fair enough. the one other thing i'd ask for is a follow-up tracking issue on removing the cares dependency, which may be an upstream thing

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@Augustyniak Augustyniak Oct 20, 2022 •
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Unless there is code to specifically override dns_resolver_config (which there shouldn't be since @Augustyniak seems to have removed it in this PR), it will use the Apple resolver on iOS and getaddrinfo elsewhere. Does that sound right to you?

  1. iOS engine builder always uses apple dns resolver
  2. Kotlin engine builder uses apple dns resolver on mac and getaddrinfo everywhere else (linux/Android). I can modify it so that it always uses getaddtinfo - let me know.
  3. c++ engine builder uses apple dns resolver on mac/OS and getaddrinfo resolver everywhere else.

I would appreciate your thoughts on 2). Will look into @alyssawilk 's comment more and open GH issue if I cannot figure it out.

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opened #2629

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Augustyniak commented Oct 20, 2022

/retest

@Augustyniak Augustyniak mentioned this pull request Oct 21, 2022
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@Augustyniak Augustyniak enabled auto-merge (squash) October 21, 2022 20:49
@Augustyniak Augustyniak merged commit c461cda into main Oct 21, 2022
@Augustyniak Augustyniak deleted the remove-support-for-cares branch October 21, 2022 20:50
jpsim added a commit that referenced this pull request Nov 4, 2022
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Merge remote-tracking branch 'origin/main' into ios-remove-forceipv6-…
82af348 
…builder-function

* origin/main:
  remove the use of deprecated flag (#2658)
  Cronvoy: Map EM Errors to Cronet API Errors II (#1594) (#2633)
  build: revert boring patch (#2651)
  Bump Lyft Support Rotation (#2654)
  fix one issue blocking bumping Envoy (#2649)
  ci: remove Snow from Lyft EM rotation (#2650)
  ci: increasing timeouts (#2653)
  python: Apply Envoy python-yapf formatting (#2648)
  repo: Shellcheck cleanups (#2646)
  repo: Switch `pip_install` -> `pip_parse` (#2647)
  Use safe_malloc instead of new when creating new_envoy_map_entry (#2632)
  python: Pin requirement hashes (#2643)
  Disable flaky TestConfig.StringAccessors (#2642)
  ci: migrate from set-output to GITHUB_OUTPUT (#2625)
  Add a comment to addPlatformFilter (#2634)
  Allow Cronvoy to build with proguard. (#2635)
  Update Envoy (#2630)
  Add support for Platform and Native filters to C++ EngineBuilder (#2626)
  Register getaddrinfo in extension_registry (#2627)
  dns: stop using cares DNS resolver (#2618)

Signed-off-by: JP Simard <jp@jpsim.com>
@david-stroup david-stroup mentioned this pull request Oct 24, 2025
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proposal: remove support for cares

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