Make parse_name() properly fail when the query name is longer than 255 characters
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Authored by nakihito on Feb 10 2020, 20:24.

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Summary

The length of a query name is the sum of its labels plus 1 for each ..
The maximum length of a query name is 255 characters. This is not
strictly enforced in parse_name() and returns a misleading error when
it occurs. This patch fixes this and adds a unit test for it.

Depends on D4418

Test Plan

ninja check-bitcoin-seeder

Diff Detail

Repository

rABC Bitcoin ABC

Branch

MaxLengthNameCheck

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No Test Coverage

Build Status

Buildable 9393
Build 16716: Default Diff Build & Tests
Build 16715: arc lint + arc unit

Event Timeline

nakihito created this revision.Feb 10 2020, 20:24

Owners added a reviewer: Restricted Owners Package.Feb 10 2020, 20:24

Herald added a reviewer: Restricted Project. · View Herald TranscriptFeb 10 2020, 20:24

Build Bitcoin-ABC / Diffs / Diff Testing started.

Build Bitcoin-ABC / Diffs / Diff Testing passed.

Harbormaster completed remote builds in B9393: Diff 16228.Feb 10 2020, 20:36

nakihito retitled this revision from Make parse_name() fail when the query name is longer than 255 characters to Make parse_name() properly fail when the query name is longer than 255 characters.Feb 10 2020, 22:02

nakihito edited the summary of this revision. (Show Details)

jasonbcox requested changes to this revision.Feb 10 2020, 22:04

jasonbcox added a subscriber: jasonbcox.

jasonbcox added inline comments.

src/seeder/dns.cpp
81	Just checking my understanding here: there needs to be at least 2 free units for the '.' and a following non-dot character? Either way, a comment explaining how this value was chosen would be helpful, since it's not obvious at a glance.
src/seeder/test/seeder_tests.cpp
124	Checking immediately beyond the boundary case would be more useful, otherwise this test will not fail for an off-by-one error.