plugin/test: fix TXT record comparison logic for multi-string vs multi-record scenarios#7413
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yongtang merged 1 commit intocoredns:masterfrom Jul 15, 2025
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…cords This fixes an issue where the test plugin failed to distinguish between: - a single TXT record split into multiple 255-byte chunks - multiple separate TXT records with single chunks The logic now joins TXT chunks for both actual and expected records before comparison, ensuring semantic correctness per RFC 1035 and avoiding false positives. Fixes coredns#7404 Signed-off-by: Syed Azeez <syedazeez337@gmail.com>
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #7413 +/- ##
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+ Coverage 55.70% 59.77% +4.07%
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Files 224 273 +49
Lines 10016 18037 +8021
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+ Hits 5579 10781 +5202
- Misses 3978 6624 +2646
- Partials 459 632 +173 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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yongtang
approved these changes
Jul 15, 2025
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Thank you @syedazeez337 |
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Summary
This PR fixes a subtle but important bug in the
testplugin of CoreDNS where TXT record assertions failed to correctly distinguish between:The result was inaccurate test validations — either false positives or failures — especially in cases where long TXT records were involved.
Problem Description
In DNS, a single TXT record may be split into multiple substrings due to the 255-byte limit. For example:
This is one TXT record, not two.
The
testplugin previously compared TXT records using raw[]stringslices fromdns.TXT.Txt, like:This caused incorrect results when:
len(Txt) > 1), andSolution
The comparison logic has been updated to:
strings.Join(...)Example Fix:
Additional Changes
plugin/test/testdata/txtrecordsplit.testRunTestFileintestdata_test.goto enable isolated testinggo fmtandgolangci-lintwith no issuesImpact
This improves the reliability of the
testplugin when verifying TXT records, especially in cases involving long or split TXT strings. It ensures future plugin development or zone file testing behaves consistently with DNS standards.Related Issue
Fixes #7404