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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Rich Felker‏ @RichFelker 8 Mar 2017
      Replying to @RichFelker @revskills

      Reported issue that came up on #alpine-linux: https://code.google.com/a/google.com/p/public-dns/issues/detail?id=1838 …

      2 replies 0 retweets 1 like
    2. CopperheadOS‏ @CopperheadOS 8 Mar 2017
      Replying to @RichFelker @revskills

      Your client does not have permission to get URL /a/google.com/p/public-dns/issues/detail?id=1838 from this server.

      1 reply 0 retweets 0 likes
    3. Rich Felker‏ @RichFelker 8 Mar 2017
      Replying to @CopperheadOS @revskills

      TL;DR they truncate to zero-length answer rather than length that fits, breaking udp-only stub resolvers.

      2 replies 0 retweets 0 likes
    4. Marek Vavrusa‏ @vavrusam 8 Mar 2017
      Replying to @RichFelker @CopperheadOS @revskills

      that is legal though, there is no concept of "truncating to length that fits"

      2 replies 0 retweets 0 likes
    5. Rich Felker‏ @RichFelker 8 Mar 2017
      Replying to @vavrusam @CopperheadOS @revskills

      Sure there is. Label has 255 A RR's. Return 100 of them.

      2 replies 0 retweets 0 likes
    6. Marek Vavrusa‏ @vavrusam 8 Mar 2017
      Replying to @RichFelker @CopperheadOS @revskills

      this is unfortunately not how rrsets work.

      1 reply 0 retweets 0 likes
    7. Rich Felker‏ @RichFelker 9 Mar 2017
      Replying to @vavrusam @CopperheadOS @revskills

      Yes it is, on every single non-Google DNS intended for use by stub resolvers.

      2 replies 0 retweets 0 likes
    8. Marek Vavrusa‏ @vavrusam 9 Mar 2017
      Replying to @RichFelker @CopperheadOS @revskills

      I'm really not aware of any auth or recursor doing that and rrsets are indivisible for various reasons.

      2 replies 0 retweets 0 likes
    9. Marek Vavrusa‏ @vavrusam 9 Mar 2017
      Replying to @vavrusam @RichFelker and

      I don't really know you, if you're on "I'm right" crusade without any support in protocol spec, enjoy.

      1 reply 0 retweets 0 likes
    10. Rich Felker‏ @RichFelker 9 Mar 2017
      Replying to @vavrusam @CopperheadOS @revskills

      It's clear from text of RFC1123 that truncated answers are meant to be usable except some special cases.

      1 reply 0 retweets 0 likes
      Rich Felker‏ @RichFelker 9 Mar 2017
      Replying to @RichFelker @vavrusam and

      MX is cited there as a special case where you can't use a truncated result.

      3:26 PM - 9 Mar 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 9 Mar 2017
          Replying to @RichFelker @vavrusam and

          And the "SHOULD try...TCP" is conditional on "if the requester supports TCP".

          1 reply 0 retweets 0 likes
        3. Marek Vavrusa‏ @vavrusam 9 Mar 2017
          Replying to @RichFelker @CopperheadOS @revskills

          come on, 1123 is RFC from 1989 that's been amended several times, most notably 2181.

          1 reply 0 retweets 0 likes
        4. Rich Felker‏ @RichFelker 9 Mar 2017
          Replying to @vavrusam @CopperheadOS @revskills

          I'm not going by spec but by what behavior is fundamentally necessary for decent UX.

          1 reply 0 retweets 0 likes
        5. Rich Felker‏ @RichFelker 9 Mar 2017
          Replying to @RichFelker @vavrusam and

          Multiple round trips to get 100 extra A's you don't want or need is not decent UX.

          2 replies 0 retweets 0 likes
        6. Rich Felker‏ @RichFelker 9 Mar 2017
          Replying to @RichFelker @vavrusam and

          The correct behavior, partial truncation, gives client a choice (TC bit) whether to ask for full rrset...

          1 reply 0 retweets 0 likes
        7. Rich Felker‏ @RichFelker 9 Mar 2017
          Replying to @RichFelker @vavrusam and

          ...or whether to use one of the first 100 A's it already got.

          0 replies 0 retweets 0 likes
        8. End of conversation

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