Could you be more specific? All I saw was: Host software MUST handle host names ... | Hacker News

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eesmith on Oct 11, 2023 | parent | context | favorite | on: How I Made a Heap Overflow in Curl

Could you be more specific? All I saw was:

      Host software MUST handle host names of up to 63 characters and
      SHOULD handle host names of up to 255 characters.

I don't see where the RFC sets a upper limit on host name size.

dig1 on Oct 11, 2023 [–]

6.1.3.5 Extensibility:

    The DNS defines domain name syntax very generally -- a
    string of labels each containing up to 63 8-bit octets,
    separated by dots, and with a maximum total of 255
    octets.

RFC1035 makes this more explicit [1].

[1] https://www.freesoft.org/CIE/RFC/1035/9.htm

eesmith on Oct 11, 2023 | [–]

Thanks!

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