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Updated 6:22 PM PT - Aug 19th, 2026
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WalkthroughChangesAdds TLSA record parsing through c-ares, integrates TLSA queries into the resolver and pending caches, exposes callback and promise-based JavaScript APIs, and adds Node-compatible bindings and tests. TLSA DNS Resolution
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Inline comments:
In `@test/js/node/dns/dns-resolve-tlsa.test.ts`:
- Around line 21-29: Make the resolver test hermetic by configuring the Resolver
created in the “resolver.resolve accepts 'TLSA' as an rrtype” test with a
deterministic local or otherwise non-public test server via setServers before
calling resolve. Preserve the assertion that TLSA returns a Promise, swallow the
expected rejection, and ensure the resolver is cancelled and any test server
resources are released even if the test fails.
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src/cares_sys/c_ares.rssrc/js/node/dns.tssrc/jsc/bindings/BunObject.cppsrc/runtime/dns_jsc/cares_jsc.rssrc/runtime/dns_jsc/dns.rssrc/runtime/node/node.classes.tstest/js/node/dns/dns-resolve-tlsa.test.tstest/js/node/dns/node-dns.test.js
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No bugs found this run, but this adds a new c-ares FFI surface (ares_dns_record API) plus a Rust-owned raw-pointer linked list with a custom destroy path — worth a human pass on the memory-safety side. The two open inline nits are non-blocking.
What was reviewed:
struct_ares_tlsa_reply::parse/destroyownership:scopeguard::defer!releasesdnsrecon all exits; each node isheap::into_raw'd once andheap::take'n once;struct_any_reply::Dropcalls the Rustdestroy, notares_free_data.any_reply_to_jsTLSA arm mirrors the CAA arm;any_reply_append_alltags entriestype: "TLSA"(verified by the mock-server test).- FFI constants (
ARES_RR_TLSA_*= 52*100+N,ARES_SECTION_ANSWER= 1) match c-ares'ares_dns_record.hkey-encoding scheme. - All
resolveTlsaentry points wired symmetrically withresolveCaaacrossdns.ts,BunObject.cpp,node.classes.ts, and the promisify table.
Extended reasoning...
Overview
Implements dns.resolveTlsa / resolve(name, 'TLSA') for Node.js ≥22.15 compatibility. Because c-ares has no legacy ares_parse_tlsa_reply, the PR binds seven functions from the newer ares_dns_record API and builds a Rust-owned struct_ares_tlsa_reply linked list (raw *mut Self next-pointers, Box<[u8]> data) so the existing generic AresReply/ares_reply_callback plumbing applies unchanged. TLSA is also wired into struct_any_reply (field, Default, parse, Drop) and any_reply_to_js. Touches 8 files: c-ares FFI bindings, resolver dispatch/caches, JS conversion, C++ Bun.dns object, .classes.ts, node:dns module, and two test files.
Security risks
Low external-facing risk — this is a read-only DNS query returning parsed record fields. The interesting risk is memory safety in the new unsafe Rust: from_raw_parts(data_ptr, data_len) over a c-ares-owned buffer, a hand-rolled tail-pointer linked-list append, and a custom destroy that must run instead of ares_free_data (mixing them would be an allocator mismatch). I traced each of these: the slice is copied into a Box<[u8]> before dnsrec is destroyed; tail always points at either head or the previously-appended node's .next; CAresRecordType::destroy for TLSA and struct_any_reply::Drop both route to struct_ares_tlsa_reply::destroy. The data_len bound comes from c-ares' own parser, not directly from wire bytes, so it's already validated against RDLENGTH.
Level of scrutiny
High. New FFI extern declarations whose signatures must exactly match vendored c-ares headers, new unsafe blocks with SAFETY invariants, and manual raw-pointer lifecycle across two destroy paths — this is squarely in REVIEW.md's "Native code: memory safety (the most-blocked category)" bucket. It's well-structured and closely mirrors the CAA/SRV plumbing, but ~130 lines of new unsafe code binding a previously-unused C API is not something I'm comfortable auto-approving.
Other factors
The PR has good hermetic test coverage (local UDP mock server exercising resolveTlsa, resolve(name, 'TLSA'), and resolveAny, plus error-shape and API-surface tests). All prior review feedback was addressed: hermeticity (971617e), resolveAny integration and bun_core::heap usage (e7df0cf). Two of my prior inline nits remain open — the || data_len == 0 control-flow divergence from Node's ParseTlsaReply, and wiring server.once('error', reject) in the test's beforeAll — but both are explicitly non-blocking. CI build #83865 was still in progress at last timeline update.
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No bugs found, but this adds ~130 lines of new unsafe Rust binding a c-ares API surface (ares_dns_record/ares_dns_rr_*) that wasn't used anywhere in the tree before, with a hand-rolled Rust-owned linked list and custom destroy — worth a human pass on the FFI signatures and ownership.
What was reviewed:
struct_ares_tlsa_reply::parse/destroyownership:scopeguard::defer!releasesdnsrecon all paths; each node isheap::into_raw'd and reclaimed viaheap::take,data: Box<[u8]>drops with the node;struct_any_reply::Dropcalls the Rust destroy (notares_free_data).- The
data_len == 0skip matches Node'sParseTlsaReply(if (!data || data_len == 0) continue;), andresolveAnynow includes TLSA (both raised and addressed in earlier rounds). - All JS-surface wiring (
dns,dns.promises, bothResolverclasses,util.promisify.custom,resolve(name,'TLSA'), rrtype error message) is covered by the subprocess mock-server test and the extendednode-dns.test.jstables.
Extended reasoning...
Overview
Implements dns.resolveTlsa / resolve(name, 'TLSA') for Node.js ≥22.15 compatibility. Touches: src/cares_sys/c_ares.rs (new ares_dns_record FFI bindings + Rust-owned struct_ares_tlsa_reply linked list + struct_any_reply field/parse/Drop), src/runtime/dns_jsc/dns.rs (CAresRecordType impl, pending cache, RecordType::TLSA, dispatch, export), src/runtime/dns_jsc/cares_jsc.rs (tlsa_reply_to_js + any_reply_to_js arm), plus mechanical exposure through BunObject.cpp, node.classes.ts, and src/js/node/dns.ts. Tests: a subprocess fixture running a local UDP mock DNS server that serves a TLSA answer, asserting exact {certUsage, selector, match, data: ArrayBuffer} bytes across resolveTlsa, resolve(name,'TLSA'), and resolveAny.
Security risks
Parses untrusted DNS wire bytes. The heavy lifting is delegated to c-ares' ares_dns_parse; this PR only reads back typed fields via ares_dns_rr_get_u8/ares_dns_rr_get_bin and copies the bin slice into a Rust-owned Box<[u8]> before destroying the c-ares record. No direct wire-byte arithmetic in Rust. data_len comes from c-ares (not the wire directly) and is used only as a from_raw_parts length with a non-null pointer guard.
Level of scrutiny
High. This is the first binding of c-ares' newer ares_dns_record API — 7 new extern "C" declarations whose signatures/enum values (ARES_SECTION_ANSWER = 1, ARES_RR_TLSA_* = 52*100+N) must match the vendored header exactly, plus a new Rust-owned reply type whose destroy diverges from every sibling (which use ares_free_data). The mock-server round-trip test gives good end-to-end confidence, but a maintainer should eyeball the FFI declarations against ares_dns_record.h.
Other factors
Five prior inline findings from earlier review rounds were all addressed: hermetic resolver pinned to 127.0.0.1:1, resolveAny now includes TLSA, bun_core::heap vocabulary adopted, mock server moved to a subprocess fixture with 'error' wired to process.exit(1), and the data_len == 0 divergence claim was refuted with a link to Node's actual source. CI build #83879 is in progress on the latest commit.
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Heads up: #39556 changes how |
Adds dns.resolveTlsa, dns.promises.resolveTlsa, Resolver.prototype.resolveTlsa,
and 'TLSA' as an accepted rrtype for dns.resolve, matching Node.js
v22.15.0 / v23.9.0.
c-ares has no legacy ares_parse_tlsa_reply, so this binds the minimal
subset of the ares_dns_record API (ares_dns_parse / ares_dns_record_rr_*
/ ares_dns_rr_get_u8 / ares_dns_rr_get_bin) and builds a Rust-owned
linked list shaped like the other reply structs so the existing resolver
pipeline applies unchanged. Each record surfaces as
{certUsage, selector, match, data: ArrayBuffer}.
Fixes #6581
…rror-message assertion The native backing of a new dns.Resolver() is freed only at GC finalization, which races process exit under LSan when the Resolver is created in the test process itself. This is pre-existing and not TLSA-specific (resolveCaa with the same pattern behaves identically). Follow the sibling dns-resolver-concurrent-timeout fixture pattern and run the Resolver-using checks in a spawned subprocess, leaving only the API-surface and global-resolver error-shape checks in-process. Also update the expected invalid-rrtype message in resolve-dns.test.ts now that TLSA is in the list.
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Actionable comments posted: 2
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Inline comments:
In `@src/cares_sys/c_ares.rs`:
- Around line 1255-1262: Add a separate `// SAFETY:` comment immediately before
the `unsafe` expressions calling `ares_dns_rr_get_u8` for
`ARES_RR_TLSA_SELECTOR` and `ARES_RR_TLSA_MATCH` in the `Self` initializer,
matching the existing justification for the TLSA record and `ARES_DATATYPE_U8`;
keep the current `cert_usage` comment unchanged.
In `@src/js/node/dns.ts`:
- Around line 622-637: Update resolveTlsa to normalize a third callback argument
when arguments.length is greater than two, validate the resulting callback, and
pass it through guardCallback before either promise completion handler invokes
it. Preserve the existing result and translated-error behavior.
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- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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src/cares_sys/c_ares.rssrc/js/node/dns.tssrc/jsc/bindings/BunObject.cppsrc/runtime/dns_jsc/cares_jsc.rssrc/runtime/dns_jsc/dns.rssrc/runtime/node/node.classes.tstest/js/bun/dns/resolve-dns.test.tstest/js/node/dns/dns-resolve-tlsa-fixture.tstest/js/node/dns/dns-resolve-tlsa.test.tstest/js/node/dns/node-dns.test.js
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…ne SAFETY block for the u8 reads; drop the stale compat note
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LGTM — both prior findings are addressed in e76112b: resolveTlsa now shifts arguments[2] and wraps with guardCallback (matching resolveCaa/resolveTxt, and covered by the new entry in the "third argument shifts the callback" test table), and the stale "Missing resolveTlsa" clause is dropped from docs/runtime/nodejs-compat.mdx.
Also re-checked after the latest push: the three ares_dns_rr_get_u8 reads are now one unsafe tuple with a single SAFETY comment (resolves the clippy undocumented_unsafe_blocks failure); struct_any_reply::Drop frees tlsa_reply via the Rust destroy walker (not ares_free_data); and the ares_dns_record_t is released via scopeguard::defer! on every exit including the ENODATA path. The robobun note about resolveMethodNames is for #39556, which hasn't landed — nothing to do here yet.
Extended reasoning...
Overview
This PR wires TLSA (RFC 6698, DNS type 52) record support end-to-end: new ares_dns_record FFI bindings and a Rust-owned struct_ares_tlsa_reply linked list in src/cares_sys/c_ares.rs; CAresRecordType/ReplyHandler impls, pending-cache field, RecordType::TLSA, and resolve_tlsa/global_resolve_tlsa in src/runtime/dns_jsc/dns.rs; tlsa_reply_to_js and the resolveAny arm in cares_jsc.rs; the Bun.dns.resolveTlsa host fn in BunObject.cpp; the DNSResolver prototype entry in node.classes.ts; and every node:dns surface (callback, promises, both Resolver classes, util.promisify hook) in src/js/node/dns.ts. Docs updated. Tests: a subprocess mock-DNS fixture verifying resolveTlsa/resolve(name,'TLSA')/resolveAny byte-for-byte, plus additions to the existence/promisify/invalid-args/third-arg-shift tables in node-dns.test.js.
Security risks
None identified. TLSA parsing runs over c-ares' ares_dns_parse (which bounds-checks the wire format); the Rust side only reads via typed accessors (ares_dns_rr_get_u8/_bin) and copies the association data into a Rust-owned Box<[u8]> before ares_dns_record_destroy. data_len comes from c-ares (not the wire directly) and is used only as the copy length. No user-controlled input reaches an allocation size or index without going through c-ares' parser first.
Level of scrutiny
Medium-high — ~130 lines of new unsafe FFI binding a c-ares API surface (ares_dns_record) that wasn't previously bound, plus manual linked-list ownership. However, the change is a tight pattern-match of the existing CAA record type at every layer (same AresReply/CAresLinked/CAresRecordType traits, same pending-cache shape, same JS wiring), and has been through three review rounds with every finding addressed. Memory ownership is straightforward: scopeguard::defer! guarantees ares_dns_record_destroy on every exit; each list node is heap::into_raw'd and reclaimed by heap::take in destroy(); struct_any_reply::Drop calls the Rust destroy (not ares_free_data).
Other factors
This is my third pass. The two findings from my previous review (missing arguments[2] shift + guardCallback wrap; stale compat-docs clause) are both fixed in e76112b, along with the CodeRabbit clippy finding (the three u8 reads now share one unsafe block). Earlier rounds already addressed resolveAny integration, bun_core::heap vocabulary, hermetic test setup, and the subprocess-fixture LSan workaround. The mock-server test asserts exact {certUsage, selector, match, data} bytes across all three entry points. The robobun heads-up about resolveMethodNames (#39556) is forward-looking — that table doesn't exist in dns.ts yet. No new issues found this run.
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Problem
dns.resolveTlsa,dns.promises.resolveTlsa, andResolver.prototype.resolveTlsaare allundefinedin Bun, andresolver.resolve(name, 'TLSA')throwsERR_INVALID_ARG_VALUE. Node.js added TLSA support in v22.15.0 / v23.9.0, so any DANE/TLSA consumer written against current Node dies withdns.resolveTlsa is not a function.Cause
TLSA (DNS type 52, RFC 6698) was never wired into the resolver. Unlike the other record types, c-ares exposes no legacy
ares_parse_tlsa_reply; TLSA is only available via the newerares_dns_recordAPI. No part of that API was bound.Fix
src/cares_sys/c_ares.rs: addns_t_tlsa = 52; bind the minimalares_dns_recordsubset (ares_dns_parse,ares_dns_record_destroy,ares_dns_record_rr_cnt,ares_dns_record_rr_get_const,ares_dns_rr_get_type,ares_dns_rr_get_u8,ares_dns_rr_get_bin); add a Rust-ownedstruct_ares_tlsa_replylinked list whoseAresReply::parsewalks the answer section and copies each TLSA record out before destroying the c-ares record. Shaping it as anext-linked list means the genericares_reply_callbackthunk and the rest of the resolver pipeline apply unchanged.src/runtime/dns_jsc/dns.rs: addPendingTlsaCacheCares, the per-type pending cache,RecordType::TLSA, the rrtype map entry, theresolve()dispatch arm,resolve_tlsa/global_resolve_tlsa, and theBun__DNS__resolveTlsaexport.CAresRecordType::destroyfor TLSA drops the Rust-owned boxes instead of callingares_free_data.src/runtime/dns_jsc/cares_jsc.rs:tlsa_reply_to_jsbuilds{certUsage, selector, match, data: ArrayBuffer}(matching Node's shape and@types/node'sTlsaRecord).src/jsc/bindings/BunObject.cpp/src/runtime/node/node.classes.ts/src/js/node/dns.ts: exposeresolveTlsaonBun.dns, theDNSResolverprototype,node:dns,dns.promises, bothResolverclasses, and theutil.promisifycustom hook.Verification
test/js/node/dns/dns-resolve-tlsa.test.tsasserts the API surface and runs a local UDP mock that serves a TLSA answer (cert usage 3, selector 1, match 1, SHA-256 data), verifying bothresolver.resolveTlsa(name)andresolver.resolve(name, 'TLSA')return{certUsage: 3, selector: 1, match: 1, data: ArrayBuffer}with the exact bytes. Also extendsnode-dns.test.jsexistence / promisify / invalid-argument tables.Fixes #6581
no test proof · iteration 0 · Platform-specific test(s) that do not run on this machine. Deferring to CI, which covers all platforms: test/js/bun/dns/resolve-dns.test.ts test/js/node/dns/node-dns.test.js