feat: async DNS resolver (hdns) + integrate into evpp clients#855

Merged

ithewei merged 17 commits into

Jul 23, 2026

Commits on Jul 23, 2026

refactor(hdns): id-based handles via EventLoop to eliminate UAF risk
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fix(evpp): notify onConnection when first-attempt DNS resolve fails
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feat(evpp): surface connect failure reason via Channel::error()
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test(dns): consolidate async DNS tests; move benchmark to unittest
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refactor(hdns): rename hdns_options_t -> hdns_setting_t
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refactor(examples): rename hdns_example -> host (async DNS lookup tool)
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fix(dns): address Copilot review comments on PR #855
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refactor(hdns): pack detached/delivering as bitfields after HEVENT_FLAGS
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fix(dns): collision-free txid allocation; clarify reconnect contract
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fix(dns): skip DNS for UDS targets; validate response source; simplify txid
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fix(dns): keep scanning on source mismatch; honor never-reentrant guarantee
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docs(dns): clarify CNAME and host example usage
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